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a1ab4c31 AC |
1 | /**************************************************************************** |
2 | * * | |
3 | * GNAT COMPILER COMPONENTS * | |
4 | * * | |
5 | * D E C L * | |
6 | * * | |
7 | * C Implementation File * | |
8 | * * | |
59909673 | 9 | * Copyright (C) 1992-2017, Free Software Foundation, Inc. * |
a1ab4c31 AC |
10 | * * |
11 | * GNAT is free software; you can redistribute it and/or modify it under * | |
12 | * terms of the GNU General Public License as published by the Free Soft- * | |
13 | * ware Foundation; either version 3, or (at your option) any later ver- * | |
14 | * sion. GNAT is distributed in the hope that it will be useful, but WITH- * | |
15 | * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * | |
16 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * | |
17 | * for more details. You should have received a copy of the GNU General * | |
18 | * Public License along with GCC; see the file COPYING3. If not see * | |
19 | * <http://www.gnu.org/licenses/>. * | |
20 | * * | |
21 | * GNAT was originally developed by the GNAT team at New York University. * | |
22 | * Extensive contributions were provided by Ada Core Technologies Inc. * | |
23 | * * | |
24 | ****************************************************************************/ | |
25 | ||
26 | #include "config.h" | |
27 | #include "system.h" | |
28 | #include "coretypes.h" | |
2adfab87 | 29 | #include "target.h" |
a1ab4c31 | 30 | #include "tree.h" |
d8a2d370 | 31 | #include "stringpool.h" |
2adfab87 AM |
32 | #include "diagnostic-core.h" |
33 | #include "alias.h" | |
34 | #include "fold-const.h" | |
d8a2d370 | 35 | #include "stor-layout.h" |
f82a627c | 36 | #include "tree-inline.h" |
59909673 | 37 | #include "demangle.h" |
a1ab4c31 AC |
38 | |
39 | #include "ada.h" | |
40 | #include "types.h" | |
41 | #include "atree.h" | |
42 | #include "elists.h" | |
43 | #include "namet.h" | |
44 | #include "nlists.h" | |
45 | #include "repinfo.h" | |
46 | #include "snames.h" | |
a1ab4c31 | 47 | #include "uintp.h" |
2971780e | 48 | #include "urealp.h" |
a1ab4c31 AC |
49 | #include "fe.h" |
50 | #include "sinfo.h" | |
51 | #include "einfo.h" | |
a1ab4c31 AC |
52 | #include "ada-tree.h" |
53 | #include "gigi.h" | |
54 | ||
28dd0055 EB |
55 | /* "stdcall" and "thiscall" conventions should be processed in a specific way |
56 | on 32-bit x86/Windows only. The macros below are helpers to avoid having | |
57 | to check for a Windows specific attribute throughout this unit. */ | |
a1ab4c31 AC |
58 | |
59 | #if TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
c6eecbd8 PO |
60 | #ifdef TARGET_64BIT |
61 | #define Has_Stdcall_Convention(E) \ | |
62 | (!TARGET_64BIT && Convention (E) == Convention_Stdcall) | |
28dd0055 EB |
63 | #define Has_Thiscall_Convention(E) \ |
64 | (!TARGET_64BIT && is_cplusplus_method (E)) | |
c6eecbd8 | 65 | #else |
a1ab4c31 | 66 | #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall) |
28dd0055 | 67 | #define Has_Thiscall_Convention(E) (is_cplusplus_method (E)) |
c6eecbd8 | 68 | #endif |
a1ab4c31 | 69 | #else |
c6eecbd8 | 70 | #define Has_Stdcall_Convention(E) 0 |
28dd0055 | 71 | #define Has_Thiscall_Convention(E) 0 |
a1ab4c31 AC |
72 | #endif |
73 | ||
93582885 EB |
74 | #define STDCALL_PREFIX "_imp__" |
75 | ||
66194a98 OH |
76 | /* Stack realignment is necessary for functions with foreign conventions when |
77 | the ABI doesn't mandate as much as what the compiler assumes - that is, up | |
78 | to PREFERRED_STACK_BOUNDARY. | |
79 | ||
80 | Such realignment can be requested with a dedicated function type attribute | |
81 | on the targets that support it. We define FOREIGN_FORCE_REALIGN_STACK to | |
82 | characterize the situations where the attribute should be set. We rely on | |
83 | compiler configuration settings for 'main' to decide. */ | |
84 | ||
85 | #ifdef MAIN_STACK_BOUNDARY | |
86 | #define FOREIGN_FORCE_REALIGN_STACK \ | |
87 | (MAIN_STACK_BOUNDARY < PREFERRED_STACK_BOUNDARY) | |
88 | #else | |
89 | #define FOREIGN_FORCE_REALIGN_STACK 0 | |
a1ab4c31 AC |
90 | #endif |
91 | ||
92 | struct incomplete | |
93 | { | |
94 | struct incomplete *next; | |
95 | tree old_type; | |
96 | Entity_Id full_type; | |
97 | }; | |
98 | ||
99 | /* These variables are used to defer recursively expanding incomplete types | |
1e55d29a | 100 | while we are processing a record, an array or a subprogram type. */ |
a1ab4c31 AC |
101 | static int defer_incomplete_level = 0; |
102 | static struct incomplete *defer_incomplete_list; | |
103 | ||
d3271136 EB |
104 | /* This variable is used to delay expanding types coming from a limited with |
105 | clause and completed Taft Amendment types until the end of the spec. */ | |
1e55d29a | 106 | static struct incomplete *defer_limited_with_list; |
a1ab4c31 | 107 | |
1aa67003 | 108 | typedef struct subst_pair_d { |
e3554601 NF |
109 | tree discriminant; |
110 | tree replacement; | |
111 | } subst_pair; | |
112 | ||
e3554601 | 113 | |
1aa67003 | 114 | typedef struct variant_desc_d { |
fb7fb701 NF |
115 | /* The type of the variant. */ |
116 | tree type; | |
117 | ||
118 | /* The associated field. */ | |
119 | tree field; | |
120 | ||
121 | /* The value of the qualifier. */ | |
122 | tree qual; | |
123 | ||
82ea8185 EB |
124 | /* The type of the variant after transformation. */ |
125 | tree new_type; | |
fb7fb701 NF |
126 | } variant_desc; |
127 | ||
fb7fb701 | 128 | |
1e55d29a | 129 | /* A map used to cache the result of annotate_value. */ |
6c907cff | 130 | struct value_annotation_hasher : ggc_cache_ptr_hash<tree_int_map> |
d242408f TS |
131 | { |
132 | static inline hashval_t | |
133 | hash (tree_int_map *m) | |
134 | { | |
135 | return htab_hash_pointer (m->base.from); | |
136 | } | |
137 | ||
138 | static inline bool | |
139 | equal (tree_int_map *a, tree_int_map *b) | |
140 | { | |
141 | return a->base.from == b->base.from; | |
142 | } | |
143 | ||
08ec2754 RS |
144 | static int |
145 | keep_cache_entry (tree_int_map *&m) | |
d242408f | 146 | { |
08ec2754 | 147 | return ggc_marked_p (m->base.from); |
d242408f TS |
148 | } |
149 | }; | |
150 | ||
151 | static GTY ((cache)) hash_table<value_annotation_hasher> *annotate_value_cache; | |
a1ab4c31 | 152 | |
1e55d29a EB |
153 | /* A map used to associate a dummy type with a list of subprogram entities. */ |
154 | struct GTY((for_user)) tree_entity_vec_map | |
155 | { | |
156 | struct tree_map_base base; | |
157 | vec<Entity_Id, va_gc_atomic> *to; | |
158 | }; | |
159 | ||
160 | void | |
161 | gt_pch_nx (Entity_Id &) | |
162 | { | |
163 | } | |
164 | ||
165 | void | |
166 | gt_pch_nx (Entity_Id *x, gt_pointer_operator op, void *cookie) | |
167 | { | |
168 | op (x, cookie); | |
169 | } | |
170 | ||
171 | struct dummy_type_hasher : ggc_cache_ptr_hash<tree_entity_vec_map> | |
172 | { | |
173 | static inline hashval_t | |
174 | hash (tree_entity_vec_map *m) | |
175 | { | |
176 | return htab_hash_pointer (m->base.from); | |
177 | } | |
178 | ||
179 | static inline bool | |
180 | equal (tree_entity_vec_map *a, tree_entity_vec_map *b) | |
181 | { | |
182 | return a->base.from == b->base.from; | |
183 | } | |
184 | ||
185 | static int | |
186 | keep_cache_entry (tree_entity_vec_map *&m) | |
187 | { | |
188 | return ggc_marked_p (m->base.from); | |
189 | } | |
190 | }; | |
191 | ||
192 | static GTY ((cache)) hash_table<dummy_type_hasher> *dummy_to_subprog_map; | |
193 | ||
0567ae8d | 194 | static void prepend_one_attribute (struct attrib **, |
e0ef6912 | 195 | enum attrib_type, tree, tree, Node_Id); |
0567ae8d AC |
196 | static void prepend_one_attribute_pragma (struct attrib **, Node_Id); |
197 | static void prepend_attributes (struct attrib **, Entity_Id); | |
bf44701f EB |
198 | static tree elaborate_expression (Node_Id, Entity_Id, const char *, bool, bool, |
199 | bool); | |
5f2e59d4 | 200 | static bool type_has_variable_size (tree); |
bf44701f EB |
201 | static tree elaborate_expression_1 (tree, Entity_Id, const char *, bool, bool); |
202 | static tree elaborate_expression_2 (tree, Entity_Id, const char *, bool, bool, | |
da01bfee | 203 | unsigned int); |
fc7a823e | 204 | static tree elaborate_reference (tree, Entity_Id, bool, tree *); |
2cac6017 | 205 | static tree gnat_to_gnu_component_type (Entity_Id, bool, bool); |
1e55d29a | 206 | static tree gnat_to_gnu_subprog_type (Entity_Id, bool, bool, tree *); |
04bc3c93 | 207 | static int adjust_packed (tree, tree, int); |
2cac6017 | 208 | static tree gnat_to_gnu_field (Entity_Id, tree, int, bool, bool); |
7414a3c3 | 209 | static tree gnu_ext_name_for_subprog (Entity_Id, tree); |
4aecc2f8 | 210 | static tree change_qualified_type (tree, int); |
d42b7559 EB |
211 | static void set_nonaliased_component_on_array_type (tree); |
212 | static void set_reverse_storage_order_on_array_type (tree); | |
a1ab4c31 | 213 | static bool same_discriminant_p (Entity_Id, Entity_Id); |
d8e94f79 | 214 | static bool array_type_has_nonaliased_component (tree, Entity_Id); |
229077b0 | 215 | static bool compile_time_known_address_p (Node_Id); |
fc7a823e | 216 | static bool cannot_be_superflat (Node_Id); |
cb3d597d | 217 | static bool constructor_address_p (tree); |
fc7a823e EB |
218 | static bool allocatable_size_p (tree, bool); |
219 | static bool initial_value_needs_conversion (tree, tree); | |
44e9e3ec | 220 | static int compare_field_bitpos (const PTR, const PTR); |
8ab31c0c AC |
221 | static bool components_to_record (Node_Id, Entity_Id, tree, tree, int, bool, |
222 | bool, bool, bool, bool, bool, bool, tree, | |
223 | tree *); | |
a1ab4c31 AC |
224 | static Uint annotate_value (tree); |
225 | static void annotate_rep (Entity_Id, tree); | |
95c1c4bb | 226 | static tree build_position_list (tree, bool, tree, tree, unsigned int, tree); |
9771b263 | 227 | static vec<subst_pair> build_subst_list (Entity_Id, Entity_Id, bool); |
05dbb83f AC |
228 | static vec<variant_desc> build_variant_list (tree, vec<subst_pair>, |
229 | vec<variant_desc>); | |
a1ab4c31 AC |
230 | static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool); |
231 | static void set_rm_size (Uint, tree, Entity_Id); | |
a1ab4c31 | 232 | static unsigned int validate_alignment (Uint, Entity_Id, unsigned int); |
89ec98ed | 233 | static unsigned int promote_object_alignment (tree, Entity_Id); |
86a8ba5b | 234 | static void check_ok_for_atomic_type (tree, Entity_Id, bool); |
e3554601 | 235 | static tree create_field_decl_from (tree, tree, tree, tree, tree, |
05dbb83f | 236 | vec<subst_pair>); |
b1a785fb | 237 | static tree create_rep_part (tree, tree, tree); |
95c1c4bb | 238 | static tree get_rep_part (tree); |
05dbb83f AC |
239 | static tree create_variant_part_from (tree, vec<variant_desc>, tree, |
240 | tree, vec<subst_pair>, bool); | |
241 | static void copy_and_substitute_in_size (tree, tree, vec<subst_pair>); | |
242 | static void copy_and_substitute_in_layout (Entity_Id, Entity_Id, tree, tree, | |
243 | vec<subst_pair>, bool); | |
2d595887 | 244 | static void associate_original_type_to_packed_array (tree, Entity_Id); |
bf44701f | 245 | static const char *get_entity_char (Entity_Id); |
1515785d OH |
246 | |
247 | /* The relevant constituents of a subprogram binding to a GCC builtin. Used | |
308e6f3a | 248 | to pass around calls performing profile compatibility checks. */ |
1515785d OH |
249 | |
250 | typedef struct { | |
251 | Entity_Id gnat_entity; /* The Ada subprogram entity. */ | |
252 | tree ada_fntype; /* The corresponding GCC type node. */ | |
253 | tree btin_fntype; /* The GCC builtin function type node. */ | |
254 | } intrin_binding_t; | |
255 | ||
256 | static bool intrin_profiles_compatible_p (intrin_binding_t *); | |
a1ab4c31 AC |
257 | \f |
258 | /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada | |
1e17ef87 EB |
259 | entity, return the equivalent GCC tree for that entity (a ..._DECL node) |
260 | and associate the ..._DECL node with the input GNAT defining identifier. | |
a1ab4c31 AC |
261 | |
262 | If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its | |
1e17ef87 EB |
263 | initial value (in GCC tree form). This is optional for a variable. For |
264 | a renamed entity, GNU_EXPR gives the object being renamed. | |
a1ab4c31 | 265 | |
afc737f0 EB |
266 | DEFINITION is true if this call is intended for a definition. This is used |
267 | for separate compilation where it is necessary to know whether an external | |
268 | declaration or a definition must be created if the GCC equivalent was not | |
269 | created previously. */ | |
a1ab4c31 AC |
270 | |
271 | tree | |
afc737f0 | 272 | gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, bool definition) |
a1ab4c31 | 273 | { |
a8e05f92 EB |
274 | /* Contains the kind of the input GNAT node. */ |
275 | const Entity_Kind kind = Ekind (gnat_entity); | |
276 | /* True if this is a type. */ | |
277 | const bool is_type = IN (kind, Type_Kind); | |
c1a569ef EB |
278 | /* True if this is an artificial entity. */ |
279 | const bool artificial_p = !Comes_From_Source (gnat_entity); | |
86060344 EB |
280 | /* True if debug info is requested for this entity. */ |
281 | const bool debug_info_p = Needs_Debug_Info (gnat_entity); | |
282 | /* True if this entity is to be considered as imported. */ | |
283 | const bool imported_p | |
284 | = (Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity))); | |
a8e05f92 EB |
285 | /* For a type, contains the equivalent GNAT node to be used in gigi. */ |
286 | Entity_Id gnat_equiv_type = Empty; | |
287 | /* Temporary used to walk the GNAT tree. */ | |
1e17ef87 | 288 | Entity_Id gnat_temp; |
1e17ef87 EB |
289 | /* Contains the GCC DECL node which is equivalent to the input GNAT node. |
290 | This node will be associated with the GNAT node by calling at the end | |
291 | of the `switch' statement. */ | |
a1ab4c31 | 292 | tree gnu_decl = NULL_TREE; |
1e17ef87 EB |
293 | /* Contains the GCC type to be used for the GCC node. */ |
294 | tree gnu_type = NULL_TREE; | |
295 | /* Contains the GCC size tree to be used for the GCC node. */ | |
296 | tree gnu_size = NULL_TREE; | |
297 | /* Contains the GCC name to be used for the GCC node. */ | |
0fb2335d | 298 | tree gnu_entity_name; |
1e17ef87 | 299 | /* True if we have already saved gnu_decl as a GNAT association. */ |
a1ab4c31 | 300 | bool saved = false; |
1e17ef87 | 301 | /* True if we incremented defer_incomplete_level. */ |
a1ab4c31 | 302 | bool this_deferred = false; |
1e17ef87 | 303 | /* True if we incremented force_global. */ |
a1ab4c31 | 304 | bool this_global = false; |
1e17ef87 | 305 | /* True if we should check to see if elaborated during processing. */ |
a1ab4c31 | 306 | bool maybe_present = false; |
1e17ef87 | 307 | /* True if we made GNU_DECL and its type here. */ |
a1ab4c31 | 308 | bool this_made_decl = false; |
a8e05f92 EB |
309 | /* Size and alignment of the GCC node, if meaningful. */ |
310 | unsigned int esize = 0, align = 0; | |
311 | /* Contains the list of attributes directly attached to the entity. */ | |
1e17ef87 | 312 | struct attrib *attr_list = NULL; |
a1ab4c31 | 313 | |
fbb1c7d4 EB |
314 | /* Since a use of an Itype is a definition, process it as such if it is in |
315 | the main unit, except for E_Access_Subtype because it's actually a use | |
d3b080bc EB |
316 | of its base type, and for E_Record_Subtype with cloned subtype because |
317 | it's actually a use of the cloned subtype, see below. */ | |
1e17ef87 | 318 | if (!definition |
a8e05f92 | 319 | && is_type |
1e17ef87 | 320 | && Is_Itype (gnat_entity) |
d3b080bc EB |
321 | && !(kind == E_Access_Subtype |
322 | || (kind == E_Record_Subtype | |
323 | && Present (Cloned_Subtype (gnat_entity)))) | |
a1ab4c31 AC |
324 | && !present_gnu_tree (gnat_entity) |
325 | && In_Extended_Main_Code_Unit (gnat_entity)) | |
326 | { | |
1e17ef87 EB |
327 | /* Ensure that we are in a subprogram mentioned in the Scope chain of |
328 | this entity, our current scope is global, or we encountered a task | |
329 | or entry (where we can't currently accurately check scoping). */ | |
a1ab4c31 AC |
330 | if (!current_function_decl |
331 | || DECL_ELABORATION_PROC_P (current_function_decl)) | |
332 | { | |
333 | process_type (gnat_entity); | |
334 | return get_gnu_tree (gnat_entity); | |
335 | } | |
336 | ||
337 | for (gnat_temp = Scope (gnat_entity); | |
1e17ef87 EB |
338 | Present (gnat_temp); |
339 | gnat_temp = Scope (gnat_temp)) | |
a1ab4c31 AC |
340 | { |
341 | if (Is_Type (gnat_temp)) | |
342 | gnat_temp = Underlying_Type (gnat_temp); | |
343 | ||
344 | if (Ekind (gnat_temp) == E_Subprogram_Body) | |
345 | gnat_temp | |
346 | = Corresponding_Spec (Parent (Declaration_Node (gnat_temp))); | |
347 | ||
7ed9919d | 348 | if (Is_Subprogram (gnat_temp) |
a1ab4c31 AC |
349 | && Present (Protected_Body_Subprogram (gnat_temp))) |
350 | gnat_temp = Protected_Body_Subprogram (gnat_temp); | |
351 | ||
352 | if (Ekind (gnat_temp) == E_Entry | |
353 | || Ekind (gnat_temp) == E_Entry_Family | |
354 | || Ekind (gnat_temp) == E_Task_Type | |
7ed9919d | 355 | || (Is_Subprogram (gnat_temp) |
a1ab4c31 AC |
356 | && present_gnu_tree (gnat_temp) |
357 | && (current_function_decl | |
afc737f0 | 358 | == gnat_to_gnu_entity (gnat_temp, NULL_TREE, false)))) |
a1ab4c31 AC |
359 | { |
360 | process_type (gnat_entity); | |
361 | return get_gnu_tree (gnat_entity); | |
362 | } | |
363 | } | |
364 | ||
a8e05f92 | 365 | /* This abort means the Itype has an incorrect scope, i.e. that its |
1e17ef87 | 366 | scope does not correspond to the subprogram it is declared in. */ |
a1ab4c31 AC |
367 | gcc_unreachable (); |
368 | } | |
369 | ||
a1ab4c31 AC |
370 | /* If we've already processed this entity, return what we got last time. |
371 | If we are defining the node, we should not have already processed it. | |
1e17ef87 EB |
372 | In that case, we will abort below when we try to save a new GCC tree |
373 | for this object. We also need to handle the case of getting a dummy | |
3fd7a66f EB |
374 | type when a Full_View exists but be careful so as not to trigger its |
375 | premature elaboration. */ | |
a8e05f92 EB |
376 | if ((!definition || (is_type && imported_p)) |
377 | && present_gnu_tree (gnat_entity)) | |
a1ab4c31 AC |
378 | { |
379 | gnu_decl = get_gnu_tree (gnat_entity); | |
380 | ||
381 | if (TREE_CODE (gnu_decl) == TYPE_DECL | |
382 | && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)) | |
383 | && IN (kind, Incomplete_Or_Private_Kind) | |
3fd7a66f EB |
384 | && Present (Full_View (gnat_entity)) |
385 | && (present_gnu_tree (Full_View (gnat_entity)) | |
386 | || No (Freeze_Node (Full_View (gnat_entity))))) | |
a1ab4c31 | 387 | { |
1e17ef87 | 388 | gnu_decl |
afc737f0 | 389 | = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, false); |
a1ab4c31 AC |
390 | save_gnu_tree (gnat_entity, NULL_TREE, false); |
391 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
392 | } | |
393 | ||
394 | return gnu_decl; | |
395 | } | |
396 | ||
1f1b69e5 EB |
397 | /* If this is a numeric or enumeral type, or an access type, a nonzero Esize |
398 | must be specified unless it was specified by the programmer. Exceptions | |
399 | are for access-to-protected-subprogram types and all access subtypes, as | |
400 | another GNAT type is used to lay out the GCC type for them. */ | |
8d5a1b4f BD |
401 | gcc_assert (!is_type |
402 | || Known_Esize (gnat_entity) | |
a1ab4c31 | 403 | || Has_Size_Clause (gnat_entity) |
1e17ef87 EB |
404 | || (!IN (kind, Numeric_Kind) |
405 | && !IN (kind, Enumeration_Kind) | |
a1ab4c31 AC |
406 | && (!IN (kind, Access_Kind) |
407 | || kind == E_Access_Protected_Subprogram_Type | |
408 | || kind == E_Anonymous_Access_Protected_Subprogram_Type | |
1f1b69e5 EB |
409 | || kind == E_Access_Subtype |
410 | || type_annotate_only))); | |
a1ab4c31 | 411 | |
b4680ca1 | 412 | /* The RM size must be specified for all discrete and fixed-point types. */ |
a8e05f92 EB |
413 | gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind) |
414 | && Unknown_RM_Size (gnat_entity))); | |
415 | ||
416 | /* If we get here, it means we have not yet done anything with this entity. | |
417 | If we are not defining it, it must be a type or an entity that is defined | |
418 | elsewhere or externally, otherwise we should have defined it already. */ | |
419 | gcc_assert (definition | |
420 | || type_annotate_only | |
421 | || is_type | |
422 | || kind == E_Discriminant | |
423 | || kind == E_Component | |
424 | || kind == E_Label | |
425 | || (kind == E_Constant && Present (Full_View (gnat_entity))) | |
426 | || Is_Public (gnat_entity)); | |
a1ab4c31 AC |
427 | |
428 | /* Get the name of the entity and set up the line number and filename of | |
e8fa3dcd PMR |
429 | the original definition for use in any decl we make. Make sure we do not |
430 | inherit another source location. */ | |
0fb2335d | 431 | gnu_entity_name = get_entity_name (gnat_entity); |
e8fa3dcd | 432 | if (Sloc (gnat_entity) != No_Location |
7ed9919d | 433 | && !renaming_from_instantiation_p (gnat_entity)) |
e8fa3dcd | 434 | Sloc_to_locus (Sloc (gnat_entity), &input_location); |
a1ab4c31 | 435 | |
a1ab4c31 | 436 | /* For cases when we are not defining (i.e., we are referencing from |
1e17ef87 | 437 | another compilation unit) public entities, show we are at global level |
a1ab4c31 AC |
438 | for the purpose of computing scopes. Don't do this for components or |
439 | discriminants since the relevant test is whether or not the record is | |
9083aacd | 440 | being defined. */ |
a962b0a1 | 441 | if (!definition |
a962b0a1 | 442 | && kind != E_Component |
a8e05f92 EB |
443 | && kind != E_Discriminant |
444 | && Is_Public (gnat_entity) | |
445 | && !Is_Statically_Allocated (gnat_entity)) | |
a1ab4c31 AC |
446 | force_global++, this_global = true; |
447 | ||
448 | /* Handle any attributes directly attached to the entity. */ | |
449 | if (Has_Gigi_Rep_Item (gnat_entity)) | |
0567ae8d | 450 | prepend_attributes (&attr_list, gnat_entity); |
a1ab4c31 | 451 | |
a8e05f92 EB |
452 | /* Do some common processing for types. */ |
453 | if (is_type) | |
454 | { | |
455 | /* Compute the equivalent type to be used in gigi. */ | |
456 | gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity); | |
457 | ||
458 | /* Machine_Attributes on types are expected to be propagated to | |
459 | subtypes. The corresponding Gigi_Rep_Items are only attached | |
460 | to the first subtype though, so we handle the propagation here. */ | |
461 | if (Base_Type (gnat_entity) != gnat_entity | |
462 | && !Is_First_Subtype (gnat_entity) | |
463 | && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity)))) | |
0567ae8d AC |
464 | prepend_attributes (&attr_list, |
465 | First_Subtype (Base_Type (gnat_entity))); | |
a8e05f92 | 466 | |
9cbad0a3 EB |
467 | /* Compute a default value for the size of an elementary type. */ |
468 | if (Known_Esize (gnat_entity) && Is_Elementary_Type (gnat_entity)) | |
a8e05f92 EB |
469 | { |
470 | unsigned int max_esize; | |
9cbad0a3 EB |
471 | |
472 | gcc_assert (UI_Is_In_Int_Range (Esize (gnat_entity))); | |
a8e05f92 EB |
473 | esize = UI_To_Int (Esize (gnat_entity)); |
474 | ||
475 | if (IN (kind, Float_Kind)) | |
476 | max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE); | |
477 | else if (IN (kind, Access_Kind)) | |
478 | max_esize = POINTER_SIZE * 2; | |
479 | else | |
480 | max_esize = LONG_LONG_TYPE_SIZE; | |
481 | ||
feec4372 EB |
482 | if (esize > max_esize) |
483 | esize = max_esize; | |
a8e05f92 | 484 | } |
a8e05f92 | 485 | } |
a1ab4c31 AC |
486 | |
487 | switch (kind) | |
488 | { | |
a1ab4c31 | 489 | case E_Component: |
59f5c969 | 490 | case E_Discriminant: |
a1ab4c31 | 491 | { |
2ddc34ba | 492 | /* The GNAT record where the component was defined. */ |
a1ab4c31 AC |
493 | Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity)); |
494 | ||
f10ff6cc AC |
495 | /* If the entity is a discriminant of an extended tagged type used to |
496 | rename a discriminant of the parent type, return the latter. */ | |
05dbb83f AC |
497 | if (kind == E_Discriminant |
498 | && Present (Corresponding_Discriminant (gnat_entity)) | |
499 | && Is_Tagged_Type (gnat_record)) | |
a1ab4c31 AC |
500 | { |
501 | gnu_decl | |
f10ff6cc | 502 | = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity), |
a1ab4c31 AC |
503 | gnu_expr, definition); |
504 | saved = true; | |
505 | break; | |
506 | } | |
507 | ||
f10ff6cc AC |
508 | /* If the entity is an inherited component (in the case of extended |
509 | tagged record types), just return the original entity, which must | |
510 | be a FIELD_DECL. Likewise for discriminants. If the entity is a | |
511 | non-girder discriminant (in the case of derived untagged record | |
512 | types), return the stored discriminant it renames. */ | |
d5ebeb8c EB |
513 | if (Present (Original_Record_Component (gnat_entity)) |
514 | && Original_Record_Component (gnat_entity) != gnat_entity) | |
a1ab4c31 | 515 | { |
a1ab4c31 | 516 | gnu_decl |
f10ff6cc | 517 | = gnat_to_gnu_entity (Original_Record_Component (gnat_entity), |
a1ab4c31 | 518 | gnu_expr, definition); |
05dbb83f AC |
519 | /* GNU_DECL contains a PLACEHOLDER_EXPR for discriminants. */ |
520 | if (kind == E_Discriminant) | |
521 | saved = true; | |
a1ab4c31 AC |
522 | break; |
523 | } | |
524 | ||
a1ab4c31 AC |
525 | /* Otherwise, if we are not defining this and we have no GCC type |
526 | for the containing record, make one for it. Then we should | |
527 | have made our own equivalent. */ | |
d5ebeb8c | 528 | if (!definition && !present_gnu_tree (gnat_record)) |
a1ab4c31 AC |
529 | { |
530 | /* ??? If this is in a record whose scope is a protected | |
531 | type and we have an Original_Record_Component, use it. | |
532 | This is a workaround for major problems in protected type | |
533 | handling. */ | |
534 | Entity_Id Scop = Scope (Scope (gnat_entity)); | |
43a4dd82 | 535 | if (Is_Protected_Type (Underlying_Type (Scop)) |
a1ab4c31 AC |
536 | && Present (Original_Record_Component (gnat_entity))) |
537 | { | |
538 | gnu_decl | |
539 | = gnat_to_gnu_entity (Original_Record_Component | |
540 | (gnat_entity), | |
afc737f0 | 541 | gnu_expr, false); |
d5ebeb8c EB |
542 | } |
543 | else | |
544 | { | |
545 | gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, false); | |
546 | gnu_decl = get_gnu_tree (gnat_entity); | |
a1ab4c31 AC |
547 | } |
548 | ||
a1ab4c31 AC |
549 | saved = true; |
550 | break; | |
551 | } | |
552 | ||
d5ebeb8c EB |
553 | /* Here we have no GCC type and this is a reference rather than a |
554 | definition. This should never happen. Most likely the cause is | |
555 | reference before declaration in the GNAT tree for gnat_entity. */ | |
556 | gcc_unreachable (); | |
a1ab4c31 AC |
557 | } |
558 | ||
5277688b EB |
559 | case E_Constant: |
560 | /* Ignore constant definitions already marked with the error node. See | |
561 | the N_Object_Declaration case of gnat_to_gnu for the rationale. */ | |
562 | if (definition | |
5277688b EB |
563 | && present_gnu_tree (gnat_entity) |
564 | && get_gnu_tree (gnat_entity) == error_mark_node) | |
565 | { | |
566 | maybe_present = true; | |
567 | break; | |
568 | } | |
569 | ||
570 | /* Ignore deferred constant definitions without address clause since | |
571 | they are processed fully in the front-end. If No_Initialization | |
572 | is set, this is not a deferred constant but a constant whose value | |
573 | is built manually. And constants that are renamings are handled | |
574 | like variables. */ | |
575 | if (definition | |
576 | && !gnu_expr | |
577 | && No (Address_Clause (gnat_entity)) | |
578 | && !No_Initialization (Declaration_Node (gnat_entity)) | |
579 | && No (Renamed_Object (gnat_entity))) | |
580 | { | |
581 | gnu_decl = error_mark_node; | |
582 | saved = true; | |
583 | break; | |
584 | } | |
585 | ||
586 | /* If this is a use of a deferred constant without address clause, | |
587 | get its full definition. */ | |
588 | if (!definition | |
589 | && No (Address_Clause (gnat_entity)) | |
590 | && Present (Full_View (gnat_entity))) | |
591 | { | |
592 | gnu_decl | |
afc737f0 | 593 | = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, false); |
5277688b EB |
594 | saved = true; |
595 | break; | |
596 | } | |
597 | ||
241125b2 EB |
598 | /* If we have a constant that we are not defining, get the expression it |
599 | was defined to represent. This is necessary to avoid generating dumb | |
600 | elaboration code in simple cases, but we may throw it away later if it | |
601 | is not a constant. But do not retrieve it if it is an allocator since | |
602 | the designated type might still be dummy at this point. */ | |
5277688b EB |
603 | if (!definition |
604 | && !No_Initialization (Declaration_Node (gnat_entity)) | |
605 | && Present (Expression (Declaration_Node (gnat_entity))) | |
606 | && Nkind (Expression (Declaration_Node (gnat_entity))) | |
607 | != N_Allocator) | |
5277688b | 608 | /* The expression may contain N_Expression_With_Actions nodes and |
93e708f9 EB |
609 | thus object declarations from other units. Discard them. */ |
610 | gnu_expr | |
611 | = gnat_to_gnu_external (Expression (Declaration_Node (gnat_entity))); | |
5277688b | 612 | |
9c453de7 | 613 | /* ... fall through ... */ |
5277688b EB |
614 | |
615 | case E_Exception: | |
a1ab4c31 AC |
616 | case E_Loop_Parameter: |
617 | case E_Out_Parameter: | |
618 | case E_Variable: | |
a1ab4c31 | 619 | { |
9182f718 | 620 | const Entity_Id gnat_type = Etype (gnat_entity); |
ae56e442 TG |
621 | /* Always create a variable for volatile objects and variables seen |
622 | constant but with a Linker_Section pragma. */ | |
a1ab4c31 AC |
623 | bool const_flag |
624 | = ((kind == E_Constant || kind == E_Variable) | |
625 | && Is_True_Constant (gnat_entity) | |
ae56e442 TG |
626 | && !(kind == E_Variable |
627 | && Present (Linker_Section_Pragma (gnat_entity))) | |
22868cbf | 628 | && !Treat_As_Volatile (gnat_entity) |
a1ab4c31 AC |
629 | && (((Nkind (Declaration_Node (gnat_entity)) |
630 | == N_Object_Declaration) | |
631 | && Present (Expression (Declaration_Node (gnat_entity)))) | |
901ad63f | 632 | || Present (Renamed_Object (gnat_entity)) |
c679a915 | 633 | || imported_p)); |
a1ab4c31 | 634 | bool inner_const_flag = const_flag; |
2056c5ed EB |
635 | bool static_flag = Is_Statically_Allocated (gnat_entity); |
636 | /* We implement RM 13.3(19) for exported and imported (non-constant) | |
637 | objects by making them volatile. */ | |
638 | bool volatile_flag | |
639 | = (Treat_As_Volatile (gnat_entity) | |
640 | || (!const_flag && (Is_Exported (gnat_entity) || imported_p))); | |
a1ab4c31 | 641 | bool mutable_p = false; |
86060344 | 642 | bool used_by_ref = false; |
a1ab4c31 AC |
643 | tree gnu_ext_name = NULL_TREE; |
644 | tree renamed_obj = NULL_TREE; | |
645 | tree gnu_object_size; | |
646 | ||
93e708f9 EB |
647 | /* We need to translate the renamed object even though we are only |
648 | referencing the renaming. But it may contain a call for which | |
649 | we'll generate a temporary to hold the return value and which | |
650 | is part of the definition of the renaming, so discard it. */ | |
a1ab4c31 AC |
651 | if (Present (Renamed_Object (gnat_entity)) && !definition) |
652 | { | |
653 | if (kind == E_Exception) | |
654 | gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity), | |
afc737f0 | 655 | NULL_TREE, false); |
a1ab4c31 | 656 | else |
93e708f9 | 657 | gnu_expr = gnat_to_gnu_external (Renamed_Object (gnat_entity)); |
a1ab4c31 AC |
658 | } |
659 | ||
660 | /* Get the type after elaborating the renamed object. */ | |
f2e04c79 | 661 | if (Has_Foreign_Convention (gnat_entity) |
a3fc8f16 | 662 | && Is_Descendant_Of_Address (Underlying_Type (gnat_type))) |
9182f718 EB |
663 | gnu_type = ptr_type_node; |
664 | else | |
665 | { | |
666 | gnu_type = gnat_to_gnu_type (gnat_type); | |
667 | ||
668 | /* If this is a standard exception definition, use the standard | |
669 | exception type. This is necessary to make sure that imported | |
670 | and exported views of exceptions are merged in LTO mode. */ | |
671 | if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL | |
672 | && DECL_NAME (TYPE_NAME (gnu_type)) == exception_data_name_id) | |
673 | gnu_type = except_type_node; | |
674 | } | |
871fda0a | 675 | |
56345d11 | 676 | /* For a debug renaming declaration, build a debug-only entity. */ |
a1ab4c31 AC |
677 | if (Present (Debug_Renaming_Link (gnat_entity))) |
678 | { | |
56345d11 EB |
679 | /* Force a non-null value to make sure the symbol is retained. */ |
680 | tree value = build1 (INDIRECT_REF, gnu_type, | |
681 | build1 (NOP_EXPR, | |
682 | build_pointer_type (gnu_type), | |
683 | integer_minus_one_node)); | |
c172df28 AH |
684 | gnu_decl = build_decl (input_location, |
685 | VAR_DECL, gnu_entity_name, gnu_type); | |
56345d11 EB |
686 | SET_DECL_VALUE_EXPR (gnu_decl, value); |
687 | DECL_HAS_VALUE_EXPR_P (gnu_decl) = 1; | |
bbe9a71d | 688 | TREE_STATIC (gnu_decl) = global_bindings_p (); |
a1ab4c31 AC |
689 | gnat_pushdecl (gnu_decl, gnat_entity); |
690 | break; | |
691 | } | |
692 | ||
693 | /* If this is a loop variable, its type should be the base type. | |
694 | This is because the code for processing a loop determines whether | |
695 | a normal loop end test can be done by comparing the bounds of the | |
696 | loop against those of the base type, which is presumed to be the | |
697 | size used for computation. But this is not correct when the size | |
698 | of the subtype is smaller than the type. */ | |
699 | if (kind == E_Loop_Parameter) | |
700 | gnu_type = get_base_type (gnu_type); | |
701 | ||
86060344 EB |
702 | /* Reject non-renamed objects whose type is an unconstrained array or |
703 | any object whose type is a dummy type or void. */ | |
a1ab4c31 AC |
704 | if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE |
705 | && No (Renamed_Object (gnat_entity))) | |
706 | || TYPE_IS_DUMMY_P (gnu_type) | |
707 | || TREE_CODE (gnu_type) == VOID_TYPE) | |
708 | { | |
709 | gcc_assert (type_annotate_only); | |
710 | if (this_global) | |
711 | force_global--; | |
712 | return error_mark_node; | |
713 | } | |
714 | ||
aae8570a | 715 | /* If an alignment is specified, use it if valid. Note that exceptions |
4d39941e EB |
716 | are objects but don't have an alignment and there is also no point in |
717 | setting it for an address clause, since the final type of the object | |
718 | will be a reference type. */ | |
719 | if (Known_Alignment (gnat_entity) | |
720 | && kind != E_Exception | |
721 | && No (Address_Clause (gnat_entity))) | |
722 | align = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
723 | TYPE_ALIGN (gnu_type)); | |
a1ab4c31 | 724 | |
4d39941e | 725 | /* Likewise, if a size is specified, use it if valid. */ |
0e5b9de3 | 726 | if (Known_Esize (gnat_entity)) |
4d39941e EB |
727 | gnu_size |
728 | = validate_size (Esize (gnat_entity), gnu_type, gnat_entity, | |
729 | VAR_DECL, false, Has_Size_Clause (gnat_entity)); | |
a1ab4c31 AC |
730 | if (gnu_size) |
731 | { | |
732 | gnu_type | |
733 | = make_type_from_size (gnu_type, gnu_size, | |
734 | Has_Biased_Representation (gnat_entity)); | |
735 | ||
736 | if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)) | |
737 | gnu_size = NULL_TREE; | |
738 | } | |
739 | ||
740 | /* If this object has self-referential size, it must be a record with | |
86060344 EB |
741 | a default discriminant. We are supposed to allocate an object of |
742 | the maximum size in this case, unless it is a constant with an | |
a1ab4c31 AC |
743 | initializing expression, in which case we can get the size from |
744 | that. Note that the resulting size may still be a variable, so | |
745 | this may end up with an indirect allocation. */ | |
746 | if (No (Renamed_Object (gnat_entity)) | |
747 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
748 | { | |
749 | if (gnu_expr && kind == E_Constant) | |
750 | { | |
751 | tree size = TYPE_SIZE (TREE_TYPE (gnu_expr)); | |
752 | if (CONTAINS_PLACEHOLDER_P (size)) | |
753 | { | |
754 | /* If the initializing expression is itself a constant, | |
755 | despite having a nominal type with self-referential | |
756 | size, we can get the size directly from it. */ | |
757 | if (TREE_CODE (gnu_expr) == COMPONENT_REF | |
a1ab4c31 AC |
758 | && TYPE_IS_PADDING_P |
759 | (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) | |
760 | && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL | |
761 | && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0)) | |
762 | || DECL_READONLY_ONCE_ELAB | |
763 | (TREE_OPERAND (gnu_expr, 0)))) | |
764 | gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0)); | |
765 | else | |
766 | gnu_size | |
767 | = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr); | |
768 | } | |
769 | else | |
770 | gnu_size = size; | |
771 | } | |
772 | /* We may have no GNU_EXPR because No_Initialization is | |
773 | set even though there's an Expression. */ | |
774 | else if (kind == E_Constant | |
775 | && (Nkind (Declaration_Node (gnat_entity)) | |
776 | == N_Object_Declaration) | |
777 | && Present (Expression (Declaration_Node (gnat_entity)))) | |
778 | gnu_size | |
779 | = TYPE_SIZE (gnat_to_gnu_type | |
780 | (Etype | |
781 | (Expression (Declaration_Node (gnat_entity))))); | |
782 | else | |
783 | { | |
784 | gnu_size = max_size (TYPE_SIZE (gnu_type), true); | |
785 | mutable_p = true; | |
786 | } | |
1d5bfe97 | 787 | |
b0ad2d78 | 788 | /* If the size isn't constant and we are at global level, call |
1d5bfe97 EB |
789 | elaborate_expression_1 to make a variable for it rather than |
790 | calculating it each time. */ | |
b0ad2d78 | 791 | if (!TREE_CONSTANT (gnu_size) && global_bindings_p ()) |
1d5bfe97 | 792 | gnu_size = elaborate_expression_1 (gnu_size, gnat_entity, |
bf44701f | 793 | "SIZE", definition, false); |
a1ab4c31 AC |
794 | } |
795 | ||
86060344 EB |
796 | /* If the size is zero byte, make it one byte since some linkers have |
797 | troubles with zero-sized objects. If the object will have a | |
a1ab4c31 AC |
798 | template, that will make it nonzero so don't bother. Also avoid |
799 | doing that for an object renaming or an object with an address | |
800 | clause, as we would lose useful information on the view size | |
801 | (e.g. for null array slices) and we are not allocating the object | |
802 | here anyway. */ | |
803 | if (((gnu_size | |
804 | && integer_zerop (gnu_size) | |
805 | && !TREE_OVERFLOW (gnu_size)) | |
806 | || (TYPE_SIZE (gnu_type) | |
807 | && integer_zerop (TYPE_SIZE (gnu_type)) | |
808 | && !TREE_OVERFLOW (TYPE_SIZE (gnu_type)))) | |
9182f718 | 809 | && !Is_Constr_Subt_For_UN_Aliased (gnat_type) |
a8e05f92 EB |
810 | && No (Renamed_Object (gnat_entity)) |
811 | && No (Address_Clause (gnat_entity))) | |
a1ab4c31 AC |
812 | gnu_size = bitsize_unit_node; |
813 | ||
814 | /* If this is an object with no specified size and alignment, and | |
815 | if either it is atomic or we are not optimizing alignment for | |
816 | space and it is composite and not an exception, an Out parameter | |
817 | or a reference to another object, and the size of its type is a | |
818 | constant, set the alignment to the smallest one which is not | |
819 | smaller than the size, with an appropriate cap. */ | |
820 | if (!gnu_size && align == 0 | |
f797c2b7 | 821 | && (Is_Atomic_Or_VFA (gnat_entity) |
a1ab4c31 AC |
822 | || (!Optimize_Alignment_Space (gnat_entity) |
823 | && kind != E_Exception | |
824 | && kind != E_Out_Parameter | |
9182f718 EB |
825 | && Is_Composite_Type (gnat_type) |
826 | && !Is_Constr_Subt_For_UN_Aliased (gnat_type) | |
c679a915 | 827 | && !Is_Exported (gnat_entity) |
a1ab4c31 AC |
828 | && !imported_p |
829 | && No (Renamed_Object (gnat_entity)) | |
830 | && No (Address_Clause (gnat_entity)))) | |
831 | && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST) | |
89ec98ed | 832 | align = promote_object_alignment (gnu_type, gnat_entity); |
a1ab4c31 AC |
833 | |
834 | /* If the object is set to have atomic components, find the component | |
835 | type and validate it. | |
836 | ||
837 | ??? Note that we ignore Has_Volatile_Components on objects; it's | |
2ddc34ba | 838 | not at all clear what to do in that case. */ |
a1ab4c31 AC |
839 | if (Has_Atomic_Components (gnat_entity)) |
840 | { | |
841 | tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE | |
842 | ? TREE_TYPE (gnu_type) : gnu_type); | |
843 | ||
844 | while (TREE_CODE (gnu_inner) == ARRAY_TYPE | |
845 | && TYPE_MULTI_ARRAY_P (gnu_inner)) | |
846 | gnu_inner = TREE_TYPE (gnu_inner); | |
847 | ||
86a8ba5b | 848 | check_ok_for_atomic_type (gnu_inner, gnat_entity, true); |
a1ab4c31 AC |
849 | } |
850 | ||
73a1a803 EB |
851 | /* If this is an aliased object with an unconstrained array nominal |
852 | subtype, make a type that includes the template. We will either | |
853 | allocate or create a variable of that type, see below. */ | |
9182f718 EB |
854 | if (Is_Constr_Subt_For_UN_Aliased (gnat_type) |
855 | && Is_Array_Type (Underlying_Type (gnat_type)) | |
a1ab4c31 | 856 | && !type_annotate_only) |
4184ef1b | 857 | { |
9182f718 | 858 | tree gnu_array = gnat_to_gnu_type (Base_Type (gnat_type)); |
4184ef1b | 859 | gnu_type |
6b318bf2 EB |
860 | = build_unc_object_type_from_ptr (TREE_TYPE (gnu_array), |
861 | gnu_type, | |
4184ef1b EB |
862 | concat_name (gnu_entity_name, |
863 | "UNC"), | |
864 | debug_info_p); | |
865 | } | |
a1ab4c31 | 866 | |
b42ff0a5 EB |
867 | /* ??? If this is an object of CW type initialized to a value, try to |
868 | ensure that the object is sufficient aligned for this value, but | |
869 | without pessimizing the allocation. This is a kludge necessary | |
870 | because we don't support dynamic alignment. */ | |
871 | if (align == 0 | |
9182f718 | 872 | && Ekind (gnat_type) == E_Class_Wide_Subtype |
b42ff0a5 EB |
873 | && No (Renamed_Object (gnat_entity)) |
874 | && No (Address_Clause (gnat_entity))) | |
875 | align = get_target_system_allocator_alignment () * BITS_PER_UNIT; | |
876 | ||
a1ab4c31 AC |
877 | #ifdef MINIMUM_ATOMIC_ALIGNMENT |
878 | /* If the size is a constant and no alignment is specified, force | |
879 | the alignment to be the minimum valid atomic alignment. The | |
880 | restriction on constant size avoids problems with variable-size | |
881 | temporaries; if the size is variable, there's no issue with | |
882 | atomic access. Also don't do this for a constant, since it isn't | |
883 | necessary and can interfere with constant replacement. Finally, | |
884 | do not do it for Out parameters since that creates an | |
885 | size inconsistency with In parameters. */ | |
b42ff0a5 EB |
886 | if (align == 0 |
887 | && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type) | |
a1ab4c31 AC |
888 | && !FLOAT_TYPE_P (gnu_type) |
889 | && !const_flag && No (Renamed_Object (gnat_entity)) | |
890 | && !imported_p && No (Address_Clause (gnat_entity)) | |
891 | && kind != E_Out_Parameter | |
892 | && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST | |
893 | : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)) | |
894 | align = MINIMUM_ATOMIC_ALIGNMENT; | |
895 | #endif | |
896 | ||
897 | /* Make a new type with the desired size and alignment, if needed. | |
898 | But do not take into account alignment promotions to compute the | |
899 | size of the object. */ | |
900 | gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type); | |
901 | if (gnu_size || align > 0) | |
51c7954d EB |
902 | { |
903 | tree orig_type = gnu_type; | |
904 | ||
905 | gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, | |
842d4ee2 | 906 | false, false, definition, true); |
51c7954d EB |
907 | |
908 | /* If a padding record was made, declare it now since it will | |
909 | never be declared otherwise. This is necessary to ensure | |
910 | that its subtrees are properly marked. */ | |
911 | if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) | |
74746d49 | 912 | create_type_decl (TYPE_NAME (gnu_type), gnu_type, true, |
51c7954d EB |
913 | debug_info_p, gnat_entity); |
914 | } | |
a1ab4c31 | 915 | |
e590690e EB |
916 | /* Now check if the type of the object allows atomic access. */ |
917 | if (Is_Atomic_Or_VFA (gnat_entity)) | |
918 | check_ok_for_atomic_type (gnu_type, gnat_entity, false); | |
919 | ||
a1ab4c31 | 920 | /* If this is a renaming, avoid as much as possible to create a new |
7194767c EB |
921 | object. However, in some cases, creating it is required because |
922 | renaming can be applied to objects that are not names in Ada. | |
923 | This processing needs to be applied to the raw expression so as | |
924 | to make it more likely to rename the underlying object. */ | |
a1ab4c31 AC |
925 | if (Present (Renamed_Object (gnat_entity))) |
926 | { | |
fc7a823e EB |
927 | /* If the renamed object had padding, strip off the reference to |
928 | the inner object and reset our type. */ | |
a1ab4c31 | 929 | if ((TREE_CODE (gnu_expr) == COMPONENT_REF |
a1ab4c31 AC |
930 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))) |
931 | /* Strip useless conversions around the object. */ | |
71196d4e | 932 | || gnat_useless_type_conversion (gnu_expr)) |
a1ab4c31 AC |
933 | { |
934 | gnu_expr = TREE_OPERAND (gnu_expr, 0); | |
935 | gnu_type = TREE_TYPE (gnu_expr); | |
936 | } | |
937 | ||
9422c886 EB |
938 | /* Or else, if the renamed object has an unconstrained type with |
939 | default discriminant, use the padded type. */ | |
fc7a823e | 940 | else if (type_is_padding_self_referential (TREE_TYPE (gnu_expr))) |
9422c886 EB |
941 | gnu_type = TREE_TYPE (gnu_expr); |
942 | ||
7194767c EB |
943 | /* Case 1: if this is a constant renaming stemming from a function |
944 | call, treat it as a normal object whose initial value is what | |
945 | is being renamed. RM 3.3 says that the result of evaluating a | |
946 | function call is a constant object. Therefore, it can be the | |
947 | inner object of a constant renaming and the renaming must be | |
948 | fully instantiated, i.e. it cannot be a reference to (part of) | |
482a338d EB |
949 | an existing object. And treat other rvalues (addresses, null |
950 | expressions, constructors and literals) the same way. */ | |
7194767c EB |
951 | tree inner = gnu_expr; |
952 | while (handled_component_p (inner) || CONVERT_EXPR_P (inner)) | |
953 | inner = TREE_OPERAND (inner, 0); | |
954 | /* Expand_Dispatching_Call can prepend a comparison of the tags | |
955 | before the call to "=". */ | |
93e708f9 EB |
956 | if (TREE_CODE (inner) == TRUTH_ANDIF_EXPR |
957 | || TREE_CODE (inner) == COMPOUND_EXPR) | |
7194767c | 958 | inner = TREE_OPERAND (inner, 1); |
241125b2 EB |
959 | if ((TREE_CODE (inner) == CALL_EXPR |
960 | && !call_is_atomic_load (inner)) | |
482a338d | 961 | || TREE_CODE (inner) == ADDR_EXPR |
241125b2 | 962 | || TREE_CODE (inner) == NULL_EXPR |
42e77cbc | 963 | || TREE_CODE (inner) == PLUS_EXPR |
241125b2 | 964 | || TREE_CODE (inner) == CONSTRUCTOR |
93e708f9 EB |
965 | || CONSTANT_CLASS_P (inner) |
966 | /* We need to detect the case where a temporary is created to | |
967 | hold the return value, since we cannot safely rename it at | |
968 | top level as it lives only in the elaboration routine. */ | |
969 | || (TREE_CODE (inner) == VAR_DECL | |
970 | && DECL_RETURN_VALUE_P (inner)) | |
971 | /* We also need to detect the case where the front-end creates | |
972 | a dangling 'reference to a function call at top level and | |
973 | substitutes it in the renaming, for example: | |
974 | ||
975 | q__b : boolean renames r__f.e (1); | |
976 | ||
977 | can be rewritten into: | |
978 | ||
979 | q__R1s : constant q__A2s := r__f'reference; | |
980 | [...] | |
981 | q__b : boolean renames q__R1s.all.e (1); | |
982 | ||
983 | We cannot safely rename the rewritten expression since the | |
984 | underlying object lives only in the elaboration routine. */ | |
985 | || (TREE_CODE (inner) == INDIRECT_REF | |
986 | && (inner | |
987 | = remove_conversions (TREE_OPERAND (inner, 0), true)) | |
988 | && TREE_CODE (inner) == VAR_DECL | |
989 | && DECL_RETURN_VALUE_P (inner))) | |
7194767c | 990 | ; |
a1ab4c31 | 991 | |
7194767c | 992 | /* Case 2: if the renaming entity need not be materialized, use |
241125b2 EB |
993 | the elaborated renamed expression for the renaming. But this |
994 | means that the caller is responsible for evaluating the address | |
fc7a823e | 995 | of the renaming in the correct place for the definition case to |
241125b2 | 996 | instantiate the SAVE_EXPRs. */ |
93e708f9 | 997 | else if (!Materialize_Entity (gnat_entity)) |
a1ab4c31 | 998 | { |
fc7a823e EB |
999 | tree init = NULL_TREE; |
1000 | ||
241125b2 | 1001 | gnu_decl |
fc7a823e EB |
1002 | = elaborate_reference (gnu_expr, gnat_entity, definition, |
1003 | &init); | |
1004 | ||
1005 | /* We cannot evaluate the first arm of a COMPOUND_EXPR in the | |
93e708f9 | 1006 | correct place for this case. */ |
7c775aca | 1007 | gcc_assert (!init); |
a1ab4c31 | 1008 | |
241125b2 EB |
1009 | /* No DECL_EXPR will be created so the expression needs to be |
1010 | marked manually because it will likely be shared. */ | |
7194767c EB |
1011 | if (global_bindings_p ()) |
1012 | MARK_VISITED (gnu_decl); | |
a1ab4c31 | 1013 | |
241125b2 EB |
1014 | /* This assertion will fail if the renamed object isn't aligned |
1015 | enough as to make it possible to honor the alignment set on | |
1016 | the renaming. */ | |
7194767c EB |
1017 | if (align) |
1018 | { | |
1019 | unsigned int ralign = DECL_P (gnu_decl) | |
1020 | ? DECL_ALIGN (gnu_decl) | |
1021 | : TYPE_ALIGN (TREE_TYPE (gnu_decl)); | |
1022 | gcc_assert (ralign >= align); | |
a1ab4c31 AC |
1023 | } |
1024 | ||
d5ebeb8c | 1025 | /* The expression might not be a DECL so save it manually. */ |
7194767c EB |
1026 | save_gnu_tree (gnat_entity, gnu_decl, true); |
1027 | saved = true; | |
1028 | annotate_object (gnat_entity, gnu_type, NULL_TREE, false); | |
1029 | break; | |
1030 | } | |
a1ab4c31 | 1031 | |
7194767c | 1032 | /* Case 3: otherwise, make a constant pointer to the object we |
241125b2 EB |
1033 | are renaming and attach the object to the pointer after it is |
1034 | elaborated. The object will be referenced directly instead | |
1035 | of indirectly via the pointer to avoid aliasing problems with | |
1036 | non-addressable entities. The pointer is called a "renaming" | |
1037 | pointer in this case. Note that we also need to preserve the | |
1038 | volatility of the renamed object through the indirection. */ | |
7194767c EB |
1039 | else |
1040 | { | |
fc7a823e EB |
1041 | tree init = NULL_TREE; |
1042 | ||
e297e2ea | 1043 | if (TREE_THIS_VOLATILE (gnu_expr) && !TYPE_VOLATILE (gnu_type)) |
4aecc2f8 EB |
1044 | gnu_type |
1045 | = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); | |
e297e2ea | 1046 | gnu_type = build_reference_type (gnu_type); |
241125b2 | 1047 | used_by_ref = true; |
e297e2ea | 1048 | const_flag = true; |
2056c5ed | 1049 | volatile_flag = false; |
241125b2 EB |
1050 | inner_const_flag = TREE_READONLY (gnu_expr); |
1051 | gnu_size = NULL_TREE; | |
a1ab4c31 | 1052 | |
241125b2 | 1053 | renamed_obj |
fc7a823e EB |
1054 | = elaborate_reference (gnu_expr, gnat_entity, definition, |
1055 | &init); | |
e297e2ea | 1056 | |
1878be32 EB |
1057 | /* The expression needs to be marked manually because it will |
1058 | likely be shared, even for a definition since the ADDR_EXPR | |
1059 | built below can cause the first few nodes to be folded. */ | |
1060 | if (global_bindings_p ()) | |
241125b2 | 1061 | MARK_VISITED (renamed_obj); |
a1ab4c31 | 1062 | |
e297e2ea | 1063 | if (type_annotate_only |
241125b2 | 1064 | && TREE_CODE (renamed_obj) == ERROR_MARK) |
e297e2ea EB |
1065 | gnu_expr = NULL_TREE; |
1066 | else | |
fc7a823e EB |
1067 | { |
1068 | gnu_expr | |
1069 | = build_unary_op (ADDR_EXPR, gnu_type, renamed_obj); | |
1070 | if (init) | |
1071 | gnu_expr | |
1072 | = build_compound_expr (TREE_TYPE (gnu_expr), init, | |
1073 | gnu_expr); | |
1074 | } | |
a1ab4c31 AC |
1075 | } |
1076 | } | |
1077 | ||
9cf18af8 EB |
1078 | /* If we are defining an aliased object whose nominal subtype is |
1079 | unconstrained, the object is a record that contains both the | |
1080 | template and the object. If there is an initializer, it will | |
1081 | have already been converted to the right type, but we need to | |
1082 | create the template if there is no initializer. */ | |
1083 | if (definition | |
1084 | && !gnu_expr | |
1085 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
1086 | && (TYPE_CONTAINS_TEMPLATE_P (gnu_type) | |
afb4afcd | 1087 | /* Beware that padding might have been introduced above. */ |
315cff15 | 1088 | || (TYPE_PADDING_P (gnu_type) |
9cf18af8 EB |
1089 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) |
1090 | == RECORD_TYPE | |
1091 | && TYPE_CONTAINS_TEMPLATE_P | |
1092 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
a1ab4c31 AC |
1093 | { |
1094 | tree template_field | |
315cff15 | 1095 | = TYPE_PADDING_P (gnu_type) |
a1ab4c31 AC |
1096 | ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type))) |
1097 | : TYPE_FIELDS (gnu_type); | |
9771b263 DN |
1098 | vec<constructor_elt, va_gc> *v; |
1099 | vec_alloc (v, 1); | |
0e228dd9 | 1100 | tree t = build_template (TREE_TYPE (template_field), |
910ad8de | 1101 | TREE_TYPE (DECL_CHAIN (template_field)), |
0e228dd9 NF |
1102 | NULL_TREE); |
1103 | CONSTRUCTOR_APPEND_ELT (v, template_field, t); | |
1104 | gnu_expr = gnat_build_constructor (gnu_type, v); | |
a1ab4c31 AC |
1105 | } |
1106 | ||
fc7a823e EB |
1107 | /* Convert the expression to the type of the object if need be. */ |
1108 | if (gnu_expr && initial_value_needs_conversion (gnu_type, gnu_expr)) | |
a1ab4c31 AC |
1109 | gnu_expr = convert (gnu_type, gnu_expr); |
1110 | ||
86060344 | 1111 | /* If this is a pointer that doesn't have an initializing expression, |
b3b5c6a2 EB |
1112 | initialize it to NULL, unless the object is declared imported as |
1113 | per RM B.1(24). */ | |
a1ab4c31 | 1114 | if (definition |
315cff15 | 1115 | && (POINTER_TYPE_P (gnu_type) || TYPE_IS_FAT_POINTER_P (gnu_type)) |
86060344 EB |
1116 | && !gnu_expr |
1117 | && !Is_Imported (gnat_entity)) | |
a1ab4c31 AC |
1118 | gnu_expr = integer_zero_node; |
1119 | ||
8df2e902 EB |
1120 | /* If we are defining the object and it has an Address clause, we must |
1121 | either get the address expression from the saved GCC tree for the | |
1122 | object if it has a Freeze node, or elaborate the address expression | |
1123 | here since the front-end has guaranteed that the elaboration has no | |
1124 | effects in this case. */ | |
a1ab4c31 AC |
1125 | if (definition && Present (Address_Clause (gnat_entity))) |
1126 | { | |
73a1a803 | 1127 | const Node_Id gnat_clause = Address_Clause (gnat_entity); |
1e55d29a | 1128 | Node_Id gnat_address = Expression (gnat_clause); |
a1ab4c31 | 1129 | tree gnu_address |
8df2e902 | 1130 | = present_gnu_tree (gnat_entity) |
1e55d29a | 1131 | ? get_gnu_tree (gnat_entity) : gnat_to_gnu (gnat_address); |
a1ab4c31 AC |
1132 | |
1133 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
1134 | ||
a1ab4c31 | 1135 | /* Convert the type of the object to a reference type that can |
b3b5c6a2 | 1136 | alias everything as per RM 13.3(19). */ |
2056c5ed EB |
1137 | if (volatile_flag && !TYPE_VOLATILE (gnu_type)) |
1138 | gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); | |
a1ab4c31 AC |
1139 | gnu_type |
1140 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
1141 | gnu_address = convert (gnu_type, gnu_address); | |
1142 | used_by_ref = true; | |
86060344 | 1143 | const_flag |
2056c5ed | 1144 | = (!Is_Public (gnat_entity) |
1e55d29a | 1145 | || compile_time_known_address_p (gnat_address)); |
2056c5ed | 1146 | volatile_flag = false; |
241125b2 | 1147 | gnu_size = NULL_TREE; |
a1ab4c31 | 1148 | |
73a1a803 EB |
1149 | /* If this is an aliased object with an unconstrained array nominal |
1150 | subtype, then it can overlay only another aliased object with an | |
1151 | unconstrained array nominal subtype and compatible template. */ | |
9182f718 EB |
1152 | if (Is_Constr_Subt_For_UN_Aliased (gnat_type) |
1153 | && Is_Array_Type (Underlying_Type (gnat_type)) | |
73a1a803 EB |
1154 | && !type_annotate_only) |
1155 | { | |
1156 | tree rec_type = TREE_TYPE (gnu_type); | |
1157 | tree off = byte_position (DECL_CHAIN (TYPE_FIELDS (rec_type))); | |
1158 | ||
1159 | /* This is the pattern built for a regular object. */ | |
1160 | if (TREE_CODE (gnu_address) == POINTER_PLUS_EXPR | |
1161 | && TREE_OPERAND (gnu_address, 1) == off) | |
1162 | gnu_address = TREE_OPERAND (gnu_address, 0); | |
1163 | /* This is the pattern built for an overaligned object. */ | |
1164 | else if (TREE_CODE (gnu_address) == POINTER_PLUS_EXPR | |
1165 | && TREE_CODE (TREE_OPERAND (gnu_address, 1)) | |
1166 | == PLUS_EXPR | |
1167 | && TREE_OPERAND (TREE_OPERAND (gnu_address, 1), 1) | |
1168 | == off) | |
1169 | gnu_address | |
1170 | = build2 (POINTER_PLUS_EXPR, gnu_type, | |
1171 | TREE_OPERAND (gnu_address, 0), | |
1172 | TREE_OPERAND (TREE_OPERAND (gnu_address, 1), 0)); | |
1173 | else | |
1174 | { | |
1175 | post_error_ne ("aliased object& with unconstrained array " | |
1176 | "nominal subtype", gnat_clause, | |
1177 | gnat_entity); | |
1178 | post_error ("\\can overlay only aliased object with " | |
1179 | "compatible subtype", gnat_clause); | |
1180 | } | |
1181 | } | |
1182 | ||
a1ab4c31 AC |
1183 | /* If we don't have an initializing expression for the underlying |
1184 | variable, the initializing expression for the pointer is the | |
1185 | specified address. Otherwise, we have to make a COMPOUND_EXPR | |
1186 | to assign both the address and the initial value. */ | |
1187 | if (!gnu_expr) | |
1188 | gnu_expr = gnu_address; | |
1189 | else | |
1190 | gnu_expr | |
1191 | = build2 (COMPOUND_EXPR, gnu_type, | |
73a1a803 EB |
1192 | build_binary_op (INIT_EXPR, NULL_TREE, |
1193 | build_unary_op (INDIRECT_REF, | |
1194 | NULL_TREE, | |
1195 | gnu_address), | |
1196 | gnu_expr), | |
a1ab4c31 AC |
1197 | gnu_address); |
1198 | } | |
1199 | ||
1200 | /* If it has an address clause and we are not defining it, mark it | |
1201 | as an indirect object. Likewise for Stdcall objects that are | |
1202 | imported. */ | |
1203 | if ((!definition && Present (Address_Clause (gnat_entity))) | |
b3b5c6a2 | 1204 | || (imported_p && Has_Stdcall_Convention (gnat_entity))) |
a1ab4c31 AC |
1205 | { |
1206 | /* Convert the type of the object to a reference type that can | |
b3b5c6a2 | 1207 | alias everything as per RM 13.3(19). */ |
2056c5ed EB |
1208 | if (volatile_flag && !TYPE_VOLATILE (gnu_type)) |
1209 | gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); | |
a1ab4c31 AC |
1210 | gnu_type |
1211 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
241125b2 | 1212 | used_by_ref = true; |
2056c5ed EB |
1213 | const_flag = false; |
1214 | volatile_flag = false; | |
a1ab4c31 AC |
1215 | gnu_size = NULL_TREE; |
1216 | ||
1217 | /* No point in taking the address of an initializing expression | |
1218 | that isn't going to be used. */ | |
1219 | gnu_expr = NULL_TREE; | |
1220 | ||
1221 | /* If it has an address clause whose value is known at compile | |
1222 | time, make the object a CONST_DECL. This will avoid a | |
1223 | useless dereference. */ | |
1224 | if (Present (Address_Clause (gnat_entity))) | |
1225 | { | |
1226 | Node_Id gnat_address | |
1227 | = Expression (Address_Clause (gnat_entity)); | |
1228 | ||
1229 | if (compile_time_known_address_p (gnat_address)) | |
1230 | { | |
1231 | gnu_expr = gnat_to_gnu (gnat_address); | |
1232 | const_flag = true; | |
1233 | } | |
1234 | } | |
a1ab4c31 AC |
1235 | } |
1236 | ||
1237 | /* If we are at top level and this object is of variable size, | |
1238 | make the actual type a hidden pointer to the real type and | |
1239 | make the initializer be a memory allocation and initialization. | |
1240 | Likewise for objects we aren't defining (presumed to be | |
1241 | external references from other packages), but there we do | |
1242 | not set up an initialization. | |
1243 | ||
1244 | If the object's size overflows, make an allocator too, so that | |
1245 | Storage_Error gets raised. Note that we will never free | |
1246 | such memory, so we presume it never will get allocated. */ | |
a1ab4c31 | 1247 | if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type), |
86060344 EB |
1248 | global_bindings_p () |
1249 | || !definition | |
2056c5ed | 1250 | || static_flag) |
f54ee980 EB |
1251 | || (gnu_size |
1252 | && !allocatable_size_p (convert (sizetype, | |
1253 | size_binop | |
1254 | (CEIL_DIV_EXPR, gnu_size, | |
1255 | bitsize_unit_node)), | |
1256 | global_bindings_p () | |
1257 | || !definition | |
2056c5ed | 1258 | || static_flag))) |
a1ab4c31 | 1259 | { |
2056c5ed EB |
1260 | if (volatile_flag && !TYPE_VOLATILE (gnu_type)) |
1261 | gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); | |
a1ab4c31 | 1262 | gnu_type = build_reference_type (gnu_type); |
a1ab4c31 | 1263 | used_by_ref = true; |
241125b2 | 1264 | const_flag = true; |
2056c5ed | 1265 | volatile_flag = false; |
241125b2 | 1266 | gnu_size = NULL_TREE; |
a1ab4c31 AC |
1267 | |
1268 | /* In case this was a aliased object whose nominal subtype is | |
1269 | unconstrained, the pointer above will be a thin pointer and | |
1270 | build_allocator will automatically make the template. | |
1271 | ||
1272 | If we have a template initializer only (that we made above), | |
1273 | pretend there is none and rely on what build_allocator creates | |
1274 | again anyway. Otherwise (if we have a full initializer), get | |
1275 | the data part and feed that to build_allocator. | |
1276 | ||
1277 | If we are elaborating a mutable object, tell build_allocator to | |
1278 | ignore a possibly simpler size from the initializer, if any, as | |
1279 | we must allocate the maximum possible size in this case. */ | |
f25496f3 | 1280 | if (definition && !imported_p) |
a1ab4c31 AC |
1281 | { |
1282 | tree gnu_alloc_type = TREE_TYPE (gnu_type); | |
1283 | ||
1284 | if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE | |
1285 | && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type)) | |
1286 | { | |
1287 | gnu_alloc_type | |
910ad8de | 1288 | = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_alloc_type))); |
a1ab4c31 AC |
1289 | |
1290 | if (TREE_CODE (gnu_expr) == CONSTRUCTOR | |
aaa1b10f | 1291 | && CONSTRUCTOR_NELTS (gnu_expr) == 1) |
2117b9bb | 1292 | gnu_expr = NULL_TREE; |
a1ab4c31 AC |
1293 | else |
1294 | gnu_expr | |
1295 | = build_component_ref | |
64235766 | 1296 | (gnu_expr, |
910ad8de | 1297 | DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), |
a1ab4c31 AC |
1298 | false); |
1299 | } | |
1300 | ||
1301 | if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST | |
ce3da0d0 | 1302 | && !valid_constant_size_p (TYPE_SIZE_UNIT (gnu_alloc_type))) |
c01fe451 | 1303 | post_error ("?`Storage_Error` will be raised at run time!", |
a1ab4c31 AC |
1304 | gnat_entity); |
1305 | ||
6f61bd41 EB |
1306 | gnu_expr |
1307 | = build_allocator (gnu_alloc_type, gnu_expr, gnu_type, | |
1308 | Empty, Empty, gnat_entity, mutable_p); | |
a1ab4c31 AC |
1309 | } |
1310 | else | |
241125b2 | 1311 | gnu_expr = NULL_TREE; |
a1ab4c31 AC |
1312 | } |
1313 | ||
1314 | /* If this object would go into the stack and has an alignment larger | |
1315 | than the largest stack alignment the back-end can honor, resort to | |
1316 | a variable of "aligning type". */ | |
73a1a803 | 1317 | if (definition |
b0ad2d78 | 1318 | && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT |
73a1a803 | 1319 | && !imported_p |
b0ad2d78 EB |
1320 | && !static_flag |
1321 | && !global_bindings_p ()) | |
a1ab4c31 AC |
1322 | { |
1323 | /* Create the new variable. No need for extra room before the | |
1324 | aligned field as this is in automatic storage. */ | |
1325 | tree gnu_new_type | |
1326 | = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type), | |
1327 | TYPE_SIZE_UNIT (gnu_type), | |
0746af5e | 1328 | BIGGEST_ALIGNMENT, 0, gnat_entity); |
a1ab4c31 AC |
1329 | tree gnu_new_var |
1330 | = create_var_decl (create_concat_name (gnat_entity, "ALIGN"), | |
2056c5ed EB |
1331 | NULL_TREE, gnu_new_type, NULL_TREE, |
1332 | false, false, false, false, false, | |
ff9baa5f PMR |
1333 | true, debug_info_p && definition, NULL, |
1334 | gnat_entity); | |
a1ab4c31 AC |
1335 | |
1336 | /* Initialize the aligned field if we have an initializer. */ | |
1337 | if (gnu_expr) | |
1338 | add_stmt_with_node | |
73a1a803 | 1339 | (build_binary_op (INIT_EXPR, NULL_TREE, |
a1ab4c31 | 1340 | build_component_ref |
64235766 EB |
1341 | (gnu_new_var, TYPE_FIELDS (gnu_new_type), |
1342 | false), | |
a1ab4c31 AC |
1343 | gnu_expr), |
1344 | gnat_entity); | |
1345 | ||
1346 | /* And setup this entity as a reference to the aligned field. */ | |
1347 | gnu_type = build_reference_type (gnu_type); | |
1348 | gnu_expr | |
1349 | = build_unary_op | |
73a1a803 | 1350 | (ADDR_EXPR, NULL_TREE, |
64235766 EB |
1351 | build_component_ref (gnu_new_var, TYPE_FIELDS (gnu_new_type), |
1352 | false)); | |
73a1a803 | 1353 | TREE_CONSTANT (gnu_expr) = 1; |
a1ab4c31 | 1354 | |
a1ab4c31 AC |
1355 | used_by_ref = true; |
1356 | const_flag = true; | |
2056c5ed | 1357 | volatile_flag = false; |
241125b2 | 1358 | gnu_size = NULL_TREE; |
a1ab4c31 AC |
1359 | } |
1360 | ||
7f46ecf6 EB |
1361 | /* If this is an aggregate constant initialized to a constant, force it |
1362 | to be statically allocated. This saves an initialization copy. */ | |
1363 | if (!static_flag | |
1364 | && const_flag | |
1365 | && gnu_expr | |
1366 | && TREE_CONSTANT (gnu_expr) | |
1367 | && AGGREGATE_TYPE_P (gnu_type) | |
1368 | && tree_fits_uhwi_p (TYPE_SIZE_UNIT (gnu_type)) | |
1369 | && !(TYPE_IS_PADDING_P (gnu_type) | |
1370 | && !tree_fits_uhwi_p (TYPE_SIZE_UNIT | |
1371 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
1372 | static_flag = true; | |
1373 | ||
73a1a803 EB |
1374 | /* If this is an aliased object with an unconstrained array nominal |
1375 | subtype, we make its type a thin reference, i.e. the reference | |
1376 | counterpart of a thin pointer, so it points to the array part. | |
1377 | This is aimed to make it easier for the debugger to decode the | |
1378 | object. Note that we have to do it this late because of the | |
1379 | couple of allocation adjustments that might be made above. */ | |
9182f718 EB |
1380 | if (Is_Constr_Subt_For_UN_Aliased (gnat_type) |
1381 | && Is_Array_Type (Underlying_Type (gnat_type)) | |
184d436a EB |
1382 | && !type_annotate_only) |
1383 | { | |
184d436a EB |
1384 | /* In case the object with the template has already been allocated |
1385 | just above, we have nothing to do here. */ | |
1386 | if (!TYPE_IS_THIN_POINTER_P (gnu_type)) | |
1387 | { | |
c1a569ef EB |
1388 | /* This variable is a GNAT encoding used by Workbench: let it |
1389 | go through the debugging information but mark it as | |
1390 | artificial: users are not interested in it. */ | |
184179f1 EB |
1391 | tree gnu_unc_var |
1392 | = create_var_decl (concat_name (gnu_entity_name, "UNC"), | |
1393 | NULL_TREE, gnu_type, gnu_expr, | |
1394 | const_flag, Is_Public (gnat_entity), | |
2056c5ed | 1395 | imported_p || !definition, static_flag, |
ff9baa5f PMR |
1396 | volatile_flag, true, |
1397 | debug_info_p && definition, | |
2056c5ed | 1398 | NULL, gnat_entity); |
73a1a803 | 1399 | gnu_expr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_unc_var); |
184179f1 | 1400 | TREE_CONSTANT (gnu_expr) = 1; |
184d436a | 1401 | |
184179f1 EB |
1402 | used_by_ref = true; |
1403 | const_flag = true; | |
2056c5ed | 1404 | volatile_flag = false; |
241125b2 EB |
1405 | inner_const_flag = TREE_READONLY (gnu_unc_var); |
1406 | gnu_size = NULL_TREE; | |
184d436a EB |
1407 | } |
1408 | ||
9182f718 | 1409 | tree gnu_array = gnat_to_gnu_type (Base_Type (gnat_type)); |
184d436a EB |
1410 | gnu_type |
1411 | = build_reference_type (TYPE_OBJECT_RECORD_TYPE (gnu_array)); | |
1412 | } | |
1413 | ||
fc7a823e EB |
1414 | /* Convert the expression to the type of the object if need be. */ |
1415 | if (gnu_expr && initial_value_needs_conversion (gnu_type, gnu_expr)) | |
a1ab4c31 AC |
1416 | gnu_expr = convert (gnu_type, gnu_expr); |
1417 | ||
1eb58520 AC |
1418 | /* If this name is external or a name was specified, use it, but don't |
1419 | use the Interface_Name with an address clause (see cd30005). */ | |
b3b5c6a2 EB |
1420 | if ((Is_Public (gnat_entity) && !Is_Imported (gnat_entity)) |
1421 | || (Present (Interface_Name (gnat_entity)) | |
1422 | && No (Address_Clause (gnat_entity)))) | |
0fb2335d | 1423 | gnu_ext_name = create_concat_name (gnat_entity, NULL); |
a1ab4c31 | 1424 | |
0567ae8d AC |
1425 | /* Deal with a pragma Linker_Section on a constant or variable. */ |
1426 | if ((kind == E_Constant || kind == E_Variable) | |
1427 | && Present (Linker_Section_Pragma (gnat_entity))) | |
1428 | prepend_one_attribute_pragma (&attr_list, | |
1429 | Linker_Section_Pragma (gnat_entity)); | |
1430 | ||
86060344 | 1431 | /* Now create the variable or the constant and set various flags. */ |
58c8f770 | 1432 | gnu_decl |
6249559b EB |
1433 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
1434 | gnu_expr, const_flag, Is_Public (gnat_entity), | |
2056c5ed | 1435 | imported_p || !definition, static_flag, |
ff9baa5f PMR |
1436 | volatile_flag, artificial_p, |
1437 | debug_info_p && definition, attr_list, | |
1438 | gnat_entity, !renamed_obj); | |
a1ab4c31 AC |
1439 | DECL_BY_REF_P (gnu_decl) = used_by_ref; |
1440 | DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag; | |
a1c7d797 | 1441 | DECL_CAN_NEVER_BE_NULL_P (gnu_decl) = Can_Never_Be_Null (gnat_entity); |
86060344 EB |
1442 | |
1443 | /* If we are defining an Out parameter and optimization isn't enabled, | |
1444 | create a fake PARM_DECL for debugging purposes and make it point to | |
1445 | the VAR_DECL. Suppress debug info for the latter but make sure it | |
f036807a | 1446 | will live in memory so that it can be accessed from within the |
86060344 | 1447 | debugger through the PARM_DECL. */ |
cd177257 EB |
1448 | if (kind == E_Out_Parameter |
1449 | && definition | |
1450 | && debug_info_p | |
1451 | && !optimize | |
1452 | && !flag_generate_lto) | |
86060344 | 1453 | { |
1e55d29a | 1454 | tree param = create_param_decl (gnu_entity_name, gnu_type); |
86060344 EB |
1455 | gnat_pushdecl (param, gnat_entity); |
1456 | SET_DECL_VALUE_EXPR (param, gnu_decl); | |
1457 | DECL_HAS_VALUE_EXPR_P (param) = 1; | |
1458 | DECL_IGNORED_P (gnu_decl) = 1; | |
1459 | TREE_ADDRESSABLE (gnu_decl) = 1; | |
1460 | } | |
1461 | ||
15bf7d19 EB |
1462 | /* If this is a loop parameter, set the corresponding flag. */ |
1463 | else if (kind == E_Loop_Parameter) | |
1464 | DECL_LOOP_PARM_P (gnu_decl) = 1; | |
1465 | ||
241125b2 | 1466 | /* If this is a renaming pointer, attach the renamed object to it. */ |
e297e2ea | 1467 | if (renamed_obj) |
241125b2 | 1468 | SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj); |
a1ab4c31 | 1469 | |
86060344 EB |
1470 | /* If this is a constant and we are defining it or it generates a real |
1471 | symbol at the object level and we are referencing it, we may want | |
1472 | or need to have a true variable to represent it: | |
1473 | - if optimization isn't enabled, for debugging purposes, | |
1474 | - if the constant is public and not overlaid on something else, | |
1475 | - if its address is taken, | |
1476 | - if either itself or its type is aliased. */ | |
a1ab4c31 AC |
1477 | if (TREE_CODE (gnu_decl) == CONST_DECL |
1478 | && (definition || Sloc (gnat_entity) > Standard_Location) | |
86060344 EB |
1479 | && ((!optimize && debug_info_p) |
1480 | || (Is_Public (gnat_entity) | |
1481 | && No (Address_Clause (gnat_entity))) | |
a1ab4c31 AC |
1482 | || Address_Taken (gnat_entity) |
1483 | || Is_Aliased (gnat_entity) | |
9182f718 | 1484 | || Is_Aliased (gnat_type))) |
a1ab4c31 AC |
1485 | { |
1486 | tree gnu_corr_var | |
6249559b EB |
1487 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
1488 | gnu_expr, true, Is_Public (gnat_entity), | |
2056c5ed | 1489 | !definition, static_flag, volatile_flag, |
ff9baa5f PMR |
1490 | artificial_p, debug_info_p && definition, |
1491 | attr_list, gnat_entity, false); | |
a1ab4c31 AC |
1492 | |
1493 | SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var); | |
a1ab4c31 AC |
1494 | } |
1495 | ||
cb3d597d EB |
1496 | /* If this is a constant, even if we don't need a true variable, we |
1497 | may need to avoid returning the initializer in every case. That | |
1498 | can happen for the address of a (constant) constructor because, | |
1499 | upon dereferencing it, the constructor will be reinjected in the | |
1500 | tree, which may not be valid in every case; see lvalue_required_p | |
1501 | for more details. */ | |
1502 | if (TREE_CODE (gnu_decl) == CONST_DECL) | |
1503 | DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr); | |
1504 | ||
86060344 EB |
1505 | /* If this object is declared in a block that contains a block with an |
1506 | exception handler, and we aren't using the GCC exception mechanism, | |
1507 | we must force this variable in memory in order to avoid an invalid | |
1508 | optimization. */ | |
0ab0bf95 | 1509 | if (Front_End_Exceptions () |
86060344 | 1510 | && Has_Nested_Block_With_Handler (Scope (gnat_entity))) |
a1ab4c31 AC |
1511 | TREE_ADDRESSABLE (gnu_decl) = 1; |
1512 | ||
f036807a EB |
1513 | /* If this is a local variable with non-BLKmode and aggregate type, |
1514 | and optimization isn't enabled, then force it in memory so that | |
1515 | a register won't be allocated to it with possible subparts left | |
1516 | uninitialized and reaching the register allocator. */ | |
1517 | else if (TREE_CODE (gnu_decl) == VAR_DECL | |
1518 | && !DECL_EXTERNAL (gnu_decl) | |
1519 | && !TREE_STATIC (gnu_decl) | |
1520 | && DECL_MODE (gnu_decl) != BLKmode | |
1521 | && AGGREGATE_TYPE_P (TREE_TYPE (gnu_decl)) | |
1522 | && !TYPE_IS_FAT_POINTER_P (TREE_TYPE (gnu_decl)) | |
1523 | && !optimize) | |
1524 | TREE_ADDRESSABLE (gnu_decl) = 1; | |
1525 | ||
86060344 EB |
1526 | /* If we are defining an object with variable size or an object with |
1527 | fixed size that will be dynamically allocated, and we are using the | |
0ab0bf95 OH |
1528 | front-end setjmp/longjmp exception mechanism, update the setjmp |
1529 | buffer. */ | |
86060344 | 1530 | if (definition |
0ab0bf95 | 1531 | && Exception_Mechanism == Front_End_SJLJ |
86060344 EB |
1532 | && get_block_jmpbuf_decl () |
1533 | && DECL_SIZE_UNIT (gnu_decl) | |
1534 | && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST | |
1535 | || (flag_stack_check == GENERIC_STACK_CHECK | |
1536 | && compare_tree_int (DECL_SIZE_UNIT (gnu_decl), | |
1537 | STACK_CHECK_MAX_VAR_SIZE) > 0))) | |
dddf8120 EB |
1538 | add_stmt_with_node (build_call_n_expr |
1539 | (update_setjmp_buf_decl, 1, | |
86060344 EB |
1540 | build_unary_op (ADDR_EXPR, NULL_TREE, |
1541 | get_block_jmpbuf_decl ())), | |
1542 | gnat_entity); | |
1543 | ||
f4cd2542 EB |
1544 | /* Back-annotate Esize and Alignment of the object if not already |
1545 | known. Note that we pick the values of the type, not those of | |
1546 | the object, to shield ourselves from low-level platform-dependent | |
1547 | adjustments like alignment promotion. This is both consistent with | |
1548 | all the treatment above, where alignment and size are set on the | |
1549 | type of the object and not on the object directly, and makes it | |
1550 | possible to support all confirming representation clauses. */ | |
1551 | annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size, | |
491f54a7 | 1552 | used_by_ref); |
a1ab4c31 AC |
1553 | } |
1554 | break; | |
1555 | ||
1556 | case E_Void: | |
1557 | /* Return a TYPE_DECL for "void" that we previously made. */ | |
10069d53 | 1558 | gnu_decl = TYPE_NAME (void_type_node); |
a1ab4c31 AC |
1559 | break; |
1560 | ||
1561 | case E_Enumeration_Type: | |
a8e05f92 | 1562 | /* A special case: for the types Character and Wide_Character in |
2ddc34ba | 1563 | Standard, we do not list all the literals. So if the literals |
825da0d2 | 1564 | are not specified, make this an integer type. */ |
a1ab4c31 AC |
1565 | if (No (First_Literal (gnat_entity))) |
1566 | { | |
825da0d2 EB |
1567 | if (esize == CHAR_TYPE_SIZE && flag_signed_char) |
1568 | gnu_type = make_signed_type (CHAR_TYPE_SIZE); | |
1569 | else | |
1570 | gnu_type = make_unsigned_type (esize); | |
0fb2335d | 1571 | TYPE_NAME (gnu_type) = gnu_entity_name; |
a1ab4c31 | 1572 | |
a8e05f92 | 1573 | /* Set TYPE_STRING_FLAG for Character and Wide_Character types. |
2ddc34ba EB |
1574 | This is needed by the DWARF-2 back-end to distinguish between |
1575 | unsigned integer types and character types. */ | |
a1ab4c31 | 1576 | TYPE_STRING_FLAG (gnu_type) = 1; |
825da0d2 EB |
1577 | |
1578 | /* This flag is needed by the call just below. */ | |
1579 | TYPE_ARTIFICIAL (gnu_type) = artificial_p; | |
1580 | ||
1581 | finish_character_type (gnu_type); | |
a1ab4c31 | 1582 | } |
74746d49 EB |
1583 | else |
1584 | { | |
1585 | /* We have a list of enumeral constants in First_Literal. We make a | |
1586 | CONST_DECL for each one and build into GNU_LITERAL_LIST the list | |
1587 | to be placed into TYPE_FIELDS. Each node is itself a TREE_LIST | |
1588 | whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the | |
1589 | value of the literal. But when we have a regular boolean type, we | |
1590 | simplify this a little by using a BOOLEAN_TYPE. */ | |
1591 | const bool is_boolean = Is_Boolean_Type (gnat_entity) | |
1592 | && !Has_Non_Standard_Rep (gnat_entity); | |
1593 | const bool is_unsigned = Is_Unsigned_Type (gnat_entity); | |
1594 | tree gnu_list = NULL_TREE; | |
1595 | Entity_Id gnat_literal; | |
1596 | ||
1597 | gnu_type = make_node (is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE); | |
1598 | TYPE_PRECISION (gnu_type) = esize; | |
1599 | TYPE_UNSIGNED (gnu_type) = is_unsigned; | |
1600 | set_min_and_max_values_for_integral_type (gnu_type, esize, | |
807e902e | 1601 | TYPE_SIGN (gnu_type)); |
74746d49 EB |
1602 | process_attributes (&gnu_type, &attr_list, true, gnat_entity); |
1603 | layout_type (gnu_type); | |
1604 | ||
1605 | for (gnat_literal = First_Literal (gnat_entity); | |
1606 | Present (gnat_literal); | |
1607 | gnat_literal = Next_Literal (gnat_literal)) | |
1608 | { | |
1609 | tree gnu_value | |
1610 | = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type); | |
c1a569ef | 1611 | /* Do not generate debug info for individual enumerators. */ |
74746d49 EB |
1612 | tree gnu_literal |
1613 | = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, | |
1614 | gnu_type, gnu_value, true, false, false, | |
2056c5ed EB |
1615 | false, false, artificial_p, false, |
1616 | NULL, gnat_literal); | |
74746d49 EB |
1617 | save_gnu_tree (gnat_literal, gnu_literal, false); |
1618 | gnu_list | |
1619 | = tree_cons (DECL_NAME (gnu_literal), gnu_value, gnu_list); | |
1620 | } | |
a1ab4c31 | 1621 | |
74746d49 EB |
1622 | if (!is_boolean) |
1623 | TYPE_VALUES (gnu_type) = nreverse (gnu_list); | |
a1ab4c31 | 1624 | |
74746d49 EB |
1625 | /* Note that the bounds are updated at the end of this function |
1626 | to avoid an infinite recursion since they refer to the type. */ | |
1627 | goto discrete_type; | |
1628 | } | |
1629 | break; | |
a1ab4c31 AC |
1630 | |
1631 | case E_Signed_Integer_Type: | |
a1ab4c31 AC |
1632 | /* For integer types, just make a signed type the appropriate number |
1633 | of bits. */ | |
1634 | gnu_type = make_signed_type (esize); | |
40d1f6af | 1635 | goto discrete_type; |
a1ab4c31 | 1636 | |
2971780e PMR |
1637 | case E_Ordinary_Fixed_Point_Type: |
1638 | case E_Decimal_Fixed_Point_Type: | |
1639 | { | |
1640 | /* Small_Value is the scale factor. */ | |
1641 | const Ureal gnat_small_value = Small_Value (gnat_entity); | |
1642 | tree scale_factor = NULL_TREE; | |
1643 | ||
1644 | gnu_type = make_signed_type (esize); | |
1645 | ||
1646 | /* Try to decode the scale factor and to save it for the fixed-point | |
1647 | types debug hook. */ | |
1648 | ||
1649 | /* There are various ways to describe the scale factor, however there | |
1650 | are cases where back-end internals cannot hold it. In such cases, | |
1651 | we output invalid scale factor for such cases (i.e. the 0/0 | |
1652 | rational constant) but we expect GNAT to output GNAT encodings, | |
1653 | then. Thus, keep this in sync with | |
1654 | Exp_Dbug.Is_Handled_Scale_Factor. */ | |
1655 | ||
1656 | /* When encoded as 1/2**N or 1/10**N, describe the scale factor as a | |
1657 | binary or decimal scale: it is easier to read for humans. */ | |
1658 | if (UI_Eq (Numerator (gnat_small_value), Uint_1) | |
1659 | && (Rbase (gnat_small_value) == 2 | |
1660 | || Rbase (gnat_small_value) == 10)) | |
1661 | { | |
1662 | /* Given RM restrictions on 'Small values, we assume here that | |
1663 | the denominator fits in an int. */ | |
1664 | const tree base = build_int_cst (integer_type_node, | |
1665 | Rbase (gnat_small_value)); | |
1666 | const tree exponent | |
1667 | = build_int_cst (integer_type_node, | |
1668 | UI_To_Int (Denominator (gnat_small_value))); | |
1669 | scale_factor | |
1670 | = build2 (RDIV_EXPR, integer_type_node, | |
1671 | integer_one_node, | |
1672 | build2 (POWER_EXPR, integer_type_node, | |
1673 | base, exponent)); | |
1674 | } | |
1675 | ||
1676 | /* Default to arbitrary scale factors descriptions. */ | |
1677 | else | |
1678 | { | |
1679 | const Uint num = Norm_Num (gnat_small_value); | |
1680 | const Uint den = Norm_Den (gnat_small_value); | |
1681 | ||
1682 | if (UI_Is_In_Int_Range (num) && UI_Is_In_Int_Range (den)) | |
1683 | { | |
1684 | const tree gnu_num | |
1685 | = build_int_cst (integer_type_node, | |
1686 | UI_To_Int (Norm_Num (gnat_small_value))); | |
1687 | const tree gnu_den | |
1688 | = build_int_cst (integer_type_node, | |
1689 | UI_To_Int (Norm_Den (gnat_small_value))); | |
1690 | scale_factor = build2 (RDIV_EXPR, integer_type_node, | |
1691 | gnu_num, gnu_den); | |
1692 | } | |
1693 | else | |
1694 | /* If compiler internals cannot represent arbitrary scale | |
1695 | factors, output an invalid scale factor so that debugger | |
1696 | don't try to handle them but so that we still have a type | |
1697 | in the output. Note that GNAT */ | |
1698 | scale_factor = integer_zero_node; | |
1699 | } | |
1700 | ||
1701 | TYPE_FIXED_POINT_P (gnu_type) = 1; | |
1702 | SET_TYPE_SCALE_FACTOR (gnu_type, scale_factor); | |
1703 | } | |
1704 | goto discrete_type; | |
1705 | ||
a1ab4c31 | 1706 | case E_Modular_Integer_Type: |
a1ab4c31 | 1707 | { |
b4680ca1 EB |
1708 | /* For modular types, make the unsigned type of the proper number |
1709 | of bits and then set up the modulus, if required. */ | |
1710 | tree gnu_modulus, gnu_high = NULL_TREE; | |
a1ab4c31 | 1711 | |
1a4cb227 AC |
1712 | /* Packed Array Impl. Types are supposed to be subtypes only. */ |
1713 | gcc_assert (!Is_Packed_Array_Impl_Type (gnat_entity)); | |
a1ab4c31 | 1714 | |
a8e05f92 | 1715 | gnu_type = make_unsigned_type (esize); |
a1ab4c31 AC |
1716 | |
1717 | /* Get the modulus in this type. If it overflows, assume it is because | |
1718 | it is equal to 2**Esize. Note that there is no overflow checking | |
1719 | done on unsigned type, so we detect the overflow by looking for | |
1720 | a modulus of zero, which is otherwise invalid. */ | |
1721 | gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type); | |
1722 | ||
1723 | if (!integer_zerop (gnu_modulus)) | |
1724 | { | |
1725 | TYPE_MODULAR_P (gnu_type) = 1; | |
1726 | SET_TYPE_MODULUS (gnu_type, gnu_modulus); | |
1727 | gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus, | |
9a1bdc31 | 1728 | build_int_cst (gnu_type, 1)); |
a1ab4c31 AC |
1729 | } |
1730 | ||
a8e05f92 EB |
1731 | /* If the upper bound is not maximal, make an extra subtype. */ |
1732 | if (gnu_high | |
1733 | && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type))) | |
a1ab4c31 | 1734 | { |
a8e05f92 | 1735 | tree gnu_subtype = make_unsigned_type (esize); |
84fb43a1 | 1736 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high); |
a1ab4c31 | 1737 | TREE_TYPE (gnu_subtype) = gnu_type; |
a1ab4c31 | 1738 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; |
a8e05f92 | 1739 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT"); |
a1ab4c31 AC |
1740 | gnu_type = gnu_subtype; |
1741 | } | |
1742 | } | |
40d1f6af | 1743 | goto discrete_type; |
a1ab4c31 AC |
1744 | |
1745 | case E_Signed_Integer_Subtype: | |
1746 | case E_Enumeration_Subtype: | |
1747 | case E_Modular_Integer_Subtype: | |
1748 | case E_Ordinary_Fixed_Point_Subtype: | |
1749 | case E_Decimal_Fixed_Point_Subtype: | |
1750 | ||
26383c64 | 1751 | /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do |
84fb43a1 | 1752 | not want to call create_range_type since we would like each subtype |
26383c64 | 1753 | node to be distinct. ??? Historically this was in preparation for |
c1abd261 | 1754 | when memory aliasing is implemented, but that's obsolete now given |
26383c64 | 1755 | the call to relate_alias_sets below. |
a1ab4c31 | 1756 | |
a8e05f92 EB |
1757 | The TREE_TYPE field of the INTEGER_TYPE points to the base type; |
1758 | this fact is used by the arithmetic conversion functions. | |
a1ab4c31 | 1759 | |
a8e05f92 EB |
1760 | We elaborate the Ancestor_Subtype if it is not in the current unit |
1761 | and one of our bounds is non-static. We do this to ensure consistent | |
1762 | naming in the case where several subtypes share the same bounds, by | |
1763 | elaborating the first such subtype first, thus using its name. */ | |
a1ab4c31 AC |
1764 | |
1765 | if (!definition | |
1766 | && Present (Ancestor_Subtype (gnat_entity)) | |
1767 | && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) | |
1768 | && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) | |
1769 | || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) | |
afc737f0 | 1770 | gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, false); |
a1ab4c31 | 1771 | |
84fb43a1 | 1772 | /* Set the precision to the Esize except for bit-packed arrays. */ |
1a4cb227 | 1773 | if (Is_Packed_Array_Impl_Type (gnat_entity) |
a1ab4c31 | 1774 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
6e0f0975 | 1775 | esize = UI_To_Int (RM_Size (gnat_entity)); |
a1ab4c31 | 1776 | |
825da0d2 EB |
1777 | /* First subtypes of Character are treated as Character; otherwise |
1778 | this should be an unsigned type if the base type is unsigned or | |
84fb43a1 | 1779 | if the lower bound is constant and non-negative or if the type |
55c8849f EB |
1780 | is biased. However, even if the lower bound is constant and |
1781 | non-negative, we use a signed type for a subtype with the same | |
1782 | size as its signed base type, because this eliminates useless | |
1783 | conversions to it and gives more leeway to the optimizer; but | |
1784 | this means that we will need to explicitly test for this case | |
1785 | when we change the representation based on the RM size. */ | |
825da0d2 EB |
1786 | if (kind == E_Enumeration_Subtype |
1787 | && No (First_Literal (Etype (gnat_entity))) | |
1788 | && Esize (gnat_entity) == RM_Size (gnat_entity) | |
1789 | && esize == CHAR_TYPE_SIZE | |
1790 | && flag_signed_char) | |
1791 | gnu_type = make_signed_type (CHAR_TYPE_SIZE); | |
47605312 | 1792 | else if (Is_Unsigned_Type (Underlying_Type (Etype (gnat_entity))) |
55c8849f EB |
1793 | || (Esize (Etype (gnat_entity)) != Esize (gnat_entity) |
1794 | && Is_Unsigned_Type (gnat_entity)) | |
825da0d2 | 1795 | || Has_Biased_Representation (gnat_entity)) |
84fb43a1 EB |
1796 | gnu_type = make_unsigned_type (esize); |
1797 | else | |
1798 | gnu_type = make_signed_type (esize); | |
1799 | TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); | |
a1ab4c31 | 1800 | |
84fb43a1 | 1801 | SET_TYPE_RM_MIN_VALUE |
1eb58520 | 1802 | (gnu_type, elaborate_expression (Type_Low_Bound (gnat_entity), |
bf44701f | 1803 | gnat_entity, "L", definition, true, |
c1a569ef | 1804 | debug_info_p)); |
84fb43a1 EB |
1805 | |
1806 | SET_TYPE_RM_MAX_VALUE | |
1eb58520 | 1807 | (gnu_type, elaborate_expression (Type_High_Bound (gnat_entity), |
bf44701f | 1808 | gnat_entity, "U", definition, true, |
c1a569ef | 1809 | debug_info_p)); |
a1ab4c31 | 1810 | |
74746d49 EB |
1811 | TYPE_BIASED_REPRESENTATION_P (gnu_type) |
1812 | = Has_Biased_Representation (gnat_entity); | |
1813 | ||
2c1f5c0a EB |
1814 | /* Do the same processing for Character subtypes as for types. */ |
1815 | if (TYPE_STRING_FLAG (TREE_TYPE (gnu_type))) | |
1816 | { | |
1817 | TYPE_NAME (gnu_type) = gnu_entity_name; | |
1818 | TYPE_STRING_FLAG (gnu_type) = 1; | |
1819 | TYPE_ARTIFICIAL (gnu_type) = artificial_p; | |
1820 | finish_character_type (gnu_type); | |
1821 | } | |
825da0d2 | 1822 | |
74746d49 EB |
1823 | /* Inherit our alias set from what we're a subtype of. Subtypes |
1824 | are not different types and a pointer can designate any instance | |
1825 | within a subtype hierarchy. */ | |
1826 | relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); | |
1827 | ||
a1ab4c31 AC |
1828 | /* One of the above calls might have caused us to be elaborated, |
1829 | so don't blow up if so. */ | |
1830 | if (present_gnu_tree (gnat_entity)) | |
1831 | { | |
1832 | maybe_present = true; | |
1833 | break; | |
1834 | } | |
1835 | ||
4fd78fe6 EB |
1836 | /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
1837 | TYPE_STUB_DECL (gnu_type) | |
1838 | = create_type_stub_decl (gnu_entity_name, gnu_type); | |
1839 | ||
2d595887 PMR |
1840 | /* For a packed array, make the original array type a parallel/debug |
1841 | type. */ | |
1eb58520 | 1842 | if (debug_info_p && Is_Packed_Array_Impl_Type (gnat_entity)) |
2d595887 | 1843 | associate_original_type_to_packed_array (gnu_type, gnat_entity); |
4fd78fe6 | 1844 | |
40d1f6af EB |
1845 | discrete_type: |
1846 | ||
b1fa9126 EB |
1847 | /* We have to handle clauses that under-align the type specially. */ |
1848 | if ((Present (Alignment_Clause (gnat_entity)) | |
1a4cb227 | 1849 | || (Is_Packed_Array_Impl_Type (gnat_entity) |
b1fa9126 EB |
1850 | && Present |
1851 | (Alignment_Clause (Original_Array_Type (gnat_entity))))) | |
1852 | && UI_Is_In_Int_Range (Alignment (gnat_entity))) | |
1853 | { | |
1854 | align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT; | |
1855 | if (align >= TYPE_ALIGN (gnu_type)) | |
1856 | align = 0; | |
1857 | } | |
1858 | ||
6e0f0975 | 1859 | /* If the type we are dealing with represents a bit-packed array, |
a1ab4c31 AC |
1860 | we need to have the bits left justified on big-endian targets |
1861 | and right justified on little-endian targets. We also need to | |
1862 | ensure that when the value is read (e.g. for comparison of two | |
1863 | such values), we only get the good bits, since the unused bits | |
6e0f0975 EB |
1864 | are uninitialized. Both goals are accomplished by wrapping up |
1865 | the modular type in an enclosing record type. */ | |
1a4cb227 | 1866 | if (Is_Packed_Array_Impl_Type (gnat_entity) |
01ddebf2 | 1867 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
a1ab4c31 | 1868 | { |
6e0f0975 | 1869 | tree gnu_field_type, gnu_field; |
a1ab4c31 | 1870 | |
b1fa9126 | 1871 | /* Set the RM size before wrapping up the original type. */ |
84fb43a1 EB |
1872 | SET_TYPE_RM_SIZE (gnu_type, |
1873 | UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); | |
6e0f0975 | 1874 | TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1; |
b1fa9126 | 1875 | |
2d595887 PMR |
1876 | /* Strip the ___XP suffix for standard DWARF. */ |
1877 | if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) | |
1878 | gnu_entity_name = TYPE_NAME (gnu_type); | |
1879 | ||
b1fa9126 | 1880 | /* Create a stripped-down declaration, mainly for debugging. */ |
74746d49 EB |
1881 | create_type_decl (gnu_entity_name, gnu_type, true, debug_info_p, |
1882 | gnat_entity); | |
b1fa9126 EB |
1883 | |
1884 | /* Now save it and build the enclosing record type. */ | |
6e0f0975 EB |
1885 | gnu_field_type = gnu_type; |
1886 | ||
a1ab4c31 AC |
1887 | gnu_type = make_node (RECORD_TYPE); |
1888 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM"); | |
a1ab4c31 | 1889 | TYPE_PACKED (gnu_type) = 1; |
b1fa9126 EB |
1890 | TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type); |
1891 | TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type); | |
1892 | SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type)); | |
1893 | ||
1894 | /* Propagate the alignment of the modular type to the record type, | |
1895 | unless there is an alignment clause that under-aligns the type. | |
1896 | This means that bit-packed arrays are given "ceil" alignment for | |
1897 | their size by default, which may seem counter-intuitive but makes | |
1898 | it possible to overlay them on modular types easily. */ | |
fe37c7af MM |
1899 | SET_TYPE_ALIGN (gnu_type, |
1900 | align > 0 ? align : TYPE_ALIGN (gnu_field_type)); | |
a1ab4c31 | 1901 | |
ee45a32d EB |
1902 | /* Propagate the reverse storage order flag to the record type so |
1903 | that the required byte swapping is performed when retrieving the | |
1904 | enclosed modular value. */ | |
1905 | TYPE_REVERSE_STORAGE_ORDER (gnu_type) | |
1906 | = Reverse_Storage_Order (Original_Array_Type (gnat_entity)); | |
1907 | ||
b1fa9126 | 1908 | relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); |
a1ab4c31 | 1909 | |
40d1f6af EB |
1910 | /* Don't declare the field as addressable since we won't be taking |
1911 | its address and this would prevent create_field_decl from making | |
1912 | a bitfield. */ | |
da01bfee EB |
1913 | gnu_field |
1914 | = create_field_decl (get_identifier ("OBJECT"), gnu_field_type, | |
1915 | gnu_type, NULL_TREE, bitsize_zero_node, 1, 0); | |
a1ab4c31 | 1916 | |
afc737f0 | 1917 | /* We will output additional debug info manually below. */ |
b1fa9126 EB |
1918 | finish_record_type (gnu_type, gnu_field, 2, false); |
1919 | compute_record_mode (gnu_type); | |
a1ab4c31 | 1920 | TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1; |
a1ab4c31 | 1921 | |
032d1b71 EB |
1922 | if (debug_info_p) |
1923 | { | |
2d595887 PMR |
1924 | /* Make the original array type a parallel/debug type. */ |
1925 | associate_original_type_to_packed_array (gnu_type, gnat_entity); | |
1926 | ||
1927 | /* Since GNU_TYPE is a padding type around the packed array | |
1928 | implementation type, the padded type is its debug type. */ | |
1929 | if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) | |
1930 | SET_TYPE_DEBUG_TYPE (gnu_type, gnu_field_type); | |
032d1b71 | 1931 | } |
a1ab4c31 AC |
1932 | } |
1933 | ||
1934 | /* If the type we are dealing with has got a smaller alignment than the | |
940ff20c | 1935 | natural one, we need to wrap it up in a record type and misalign the |
b3f75672 | 1936 | latter; we reuse the padding machinery for this purpose. */ |
b1fa9126 | 1937 | else if (align > 0) |
a1ab4c31 | 1938 | { |
b3f75672 | 1939 | tree gnu_size = UI_To_gnu (RM_Size (gnat_entity), bitsizetype); |
b1fa9126 | 1940 | |
b3f75672 EB |
1941 | /* Set the RM size before wrapping the type. */ |
1942 | SET_TYPE_RM_SIZE (gnu_type, gnu_size); | |
b1fa9126 | 1943 | |
b3f75672 EB |
1944 | gnu_type |
1945 | = maybe_pad_type (gnu_type, TYPE_SIZE (gnu_type), align, | |
1946 | gnat_entity, false, true, definition, false); | |
a1ab4c31 | 1947 | |
a1ab4c31 | 1948 | TYPE_PACKED (gnu_type) = 1; |
b3f75672 | 1949 | SET_TYPE_ADA_SIZE (gnu_type, gnu_size); |
a1ab4c31 AC |
1950 | } |
1951 | ||
a1ab4c31 AC |
1952 | break; |
1953 | ||
1954 | case E_Floating_Point_Type: | |
a1ab4c31 AC |
1955 | /* The type of the Low and High bounds can be our type if this is |
1956 | a type from Standard, so set them at the end of the function. */ | |
1957 | gnu_type = make_node (REAL_TYPE); | |
1958 | TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); | |
1959 | layout_type (gnu_type); | |
1960 | break; | |
1961 | ||
1962 | case E_Floating_Point_Subtype: | |
74746d49 EB |
1963 | /* See the E_Signed_Integer_Subtype case for the rationale. */ |
1964 | if (!definition | |
1965 | && Present (Ancestor_Subtype (gnat_entity)) | |
1966 | && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) | |
1967 | && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) | |
1968 | || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) | |
afc737f0 | 1969 | gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, false); |
a1ab4c31 | 1970 | |
74746d49 EB |
1971 | gnu_type = make_node (REAL_TYPE); |
1972 | TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); | |
1973 | TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); | |
1974 | TYPE_GCC_MIN_VALUE (gnu_type) | |
1975 | = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type)); | |
1976 | TYPE_GCC_MAX_VALUE (gnu_type) | |
1977 | = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type)); | |
1978 | layout_type (gnu_type); | |
1979 | ||
1980 | SET_TYPE_RM_MIN_VALUE | |
1eb58520 | 1981 | (gnu_type, elaborate_expression (Type_Low_Bound (gnat_entity), |
bf44701f | 1982 | gnat_entity, "L", definition, true, |
c1a569ef | 1983 | debug_info_p)); |
74746d49 EB |
1984 | |
1985 | SET_TYPE_RM_MAX_VALUE | |
1eb58520 | 1986 | (gnu_type, elaborate_expression (Type_High_Bound (gnat_entity), |
bf44701f | 1987 | gnat_entity, "U", definition, true, |
c1a569ef | 1988 | debug_info_p)); |
74746d49 EB |
1989 | |
1990 | /* Inherit our alias set from what we're a subtype of, as for | |
1991 | integer subtypes. */ | |
1992 | relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); | |
1993 | ||
1994 | /* One of the above calls might have caused us to be elaborated, | |
1995 | so don't blow up if so. */ | |
1996 | maybe_present = true; | |
1997 | break; | |
a1ab4c31 | 1998 | |
e8fa3dcd | 1999 | /* Array Types and Subtypes |
a1ab4c31 AC |
2000 | |
2001 | Unconstrained array types are represented by E_Array_Type and | |
2002 | constrained array types are represented by E_Array_Subtype. There | |
2003 | are no actual objects of an unconstrained array type; all we have | |
2004 | are pointers to that type. | |
2005 | ||
2006 | The following fields are defined on array types and subtypes: | |
2007 | ||
2008 | Component_Type Component type of the array. | |
2009 | Number_Dimensions Number of dimensions (an int). | |
2010 | First_Index Type of first index. */ | |
2011 | ||
a1ab4c31 AC |
2012 | case E_Array_Type: |
2013 | { | |
4e6602a8 EB |
2014 | const bool convention_fortran_p |
2015 | = (Convention (gnat_entity) == Convention_Fortran); | |
2016 | const int ndim = Number_Dimensions (gnat_entity); | |
2afda005 TG |
2017 | tree gnu_template_type; |
2018 | tree gnu_ptr_template; | |
e3edbd56 | 2019 | tree gnu_template_reference, gnu_template_fields, gnu_fat_type; |
2bb1fc26 NF |
2020 | tree *gnu_index_types = XALLOCAVEC (tree, ndim); |
2021 | tree *gnu_temp_fields = XALLOCAVEC (tree, ndim); | |
e3edbd56 EB |
2022 | tree gnu_max_size = size_one_node, gnu_max_size_unit, tem, t; |
2023 | Entity_Id gnat_index, gnat_name; | |
4e6602a8 | 2024 | int index; |
9aa04cc7 AC |
2025 | tree comp_type; |
2026 | ||
2027 | /* Create the type for the component now, as it simplifies breaking | |
2028 | type reference loops. */ | |
2029 | comp_type | |
2030 | = gnat_to_gnu_component_type (gnat_entity, definition, debug_info_p); | |
2031 | if (present_gnu_tree (gnat_entity)) | |
2032 | { | |
2033 | /* As a side effect, the type may have been translated. */ | |
2034 | maybe_present = true; | |
2035 | break; | |
2036 | } | |
a1ab4c31 | 2037 | |
e3edbd56 EB |
2038 | /* We complete an existing dummy fat pointer type in place. This both |
2039 | avoids further complex adjustments in update_pointer_to and yields | |
2040 | better debugging information in DWARF by leveraging the support for | |
2041 | incomplete declarations of "tagged" types in the DWARF back-end. */ | |
2042 | gnu_type = get_dummy_type (gnat_entity); | |
2043 | if (gnu_type && TYPE_POINTER_TO (gnu_type)) | |
2044 | { | |
2045 | gnu_fat_type = TYPE_MAIN_VARIANT (TYPE_POINTER_TO (gnu_type)); | |
2046 | TYPE_NAME (gnu_fat_type) = NULL_TREE; | |
2047 | /* Save the contents of the dummy type for update_pointer_to. */ | |
2048 | TYPE_POINTER_TO (gnu_type) = copy_type (gnu_fat_type); | |
2afda005 TG |
2049 | gnu_ptr_template = |
2050 | TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_fat_type))); | |
2051 | gnu_template_type = TREE_TYPE (gnu_ptr_template); | |
e3edbd56 EB |
2052 | } |
2053 | else | |
2afda005 TG |
2054 | { |
2055 | gnu_fat_type = make_node (RECORD_TYPE); | |
2056 | gnu_template_type = make_node (RECORD_TYPE); | |
2057 | gnu_ptr_template = build_pointer_type (gnu_template_type); | |
2058 | } | |
a1ab4c31 AC |
2059 | |
2060 | /* Make a node for the array. If we are not defining the array | |
2061 | suppress expanding incomplete types. */ | |
2062 | gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE); | |
2063 | ||
2064 | if (!definition) | |
8cd28148 EB |
2065 | { |
2066 | defer_incomplete_level++; | |
2067 | this_deferred = true; | |
2068 | } | |
a1ab4c31 AC |
2069 | |
2070 | /* Build the fat pointer type. Use a "void *" object instead of | |
2071 | a pointer to the array type since we don't have the array type | |
2072 | yet (it will reference the fat pointer via the bounds). */ | |
98cd3025 | 2073 | tem |
1366ba41 | 2074 | = create_field_decl (get_identifier ("P_ARRAY"), ptr_type_node, |
98cd3025 | 2075 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); |
e3edbd56 | 2076 | DECL_CHAIN (tem) |
98cd3025 EB |
2077 | = create_field_decl (get_identifier ("P_BOUNDS"), gnu_ptr_template, |
2078 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
e3edbd56 EB |
2079 | |
2080 | if (COMPLETE_TYPE_P (gnu_fat_type)) | |
2081 | { | |
2082 | /* We are going to lay it out again so reset the alias set. */ | |
2083 | alias_set_type alias_set = TYPE_ALIAS_SET (gnu_fat_type); | |
2084 | TYPE_ALIAS_SET (gnu_fat_type) = -1; | |
2085 | finish_fat_pointer_type (gnu_fat_type, tem); | |
2086 | TYPE_ALIAS_SET (gnu_fat_type) = alias_set; | |
2087 | for (t = gnu_fat_type; t; t = TYPE_NEXT_VARIANT (t)) | |
2088 | { | |
2089 | TYPE_FIELDS (t) = tem; | |
2090 | SET_TYPE_UNCONSTRAINED_ARRAY (t, gnu_type); | |
2091 | } | |
2092 | } | |
2093 | else | |
2094 | { | |
2095 | finish_fat_pointer_type (gnu_fat_type, tem); | |
2096 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type); | |
2097 | } | |
a1ab4c31 AC |
2098 | |
2099 | /* Build a reference to the template from a PLACEHOLDER_EXPR that | |
2100 | is the fat pointer. This will be used to access the individual | |
2101 | fields once we build them. */ | |
2102 | tem = build3 (COMPONENT_REF, gnu_ptr_template, | |
2103 | build0 (PLACEHOLDER_EXPR, gnu_fat_type), | |
910ad8de | 2104 | DECL_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE); |
a1ab4c31 AC |
2105 | gnu_template_reference |
2106 | = build_unary_op (INDIRECT_REF, gnu_template_type, tem); | |
2107 | TREE_READONLY (gnu_template_reference) = 1; | |
50179d58 | 2108 | TREE_THIS_NOTRAP (gnu_template_reference) = 1; |
a1ab4c31 | 2109 | |
4e6602a8 EB |
2110 | /* Now create the GCC type for each index and add the fields for that |
2111 | index to the template. */ | |
2112 | for (index = (convention_fortran_p ? ndim - 1 : 0), | |
2113 | gnat_index = First_Index (gnat_entity); | |
278f422c | 2114 | IN_RANGE (index, 0, ndim - 1); |
4e6602a8 EB |
2115 | index += (convention_fortran_p ? - 1 : 1), |
2116 | gnat_index = Next_Index (gnat_index)) | |
a1ab4c31 | 2117 | { |
4e6602a8 | 2118 | char field_name[16]; |
9a1bdc31 | 2119 | tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); |
825da0d2 EB |
2120 | tree gnu_index_base_type |
2121 | = maybe_character_type (get_base_type (gnu_index_type)); | |
b6c056fe EB |
2122 | tree gnu_lb_field, gnu_hb_field, gnu_orig_min, gnu_orig_max; |
2123 | tree gnu_min, gnu_max, gnu_high; | |
4e6602a8 EB |
2124 | |
2125 | /* Make the FIELD_DECLs for the low and high bounds of this | |
2126 | type and then make extractions of these fields from the | |
a1ab4c31 AC |
2127 | template. */ |
2128 | sprintf (field_name, "LB%d", index); | |
b6c056fe EB |
2129 | gnu_lb_field = create_field_decl (get_identifier (field_name), |
2130 | gnu_index_base_type, | |
da01bfee EB |
2131 | gnu_template_type, NULL_TREE, |
2132 | NULL_TREE, 0, 0); | |
a1ab4c31 | 2133 | Sloc_to_locus (Sloc (gnat_entity), |
b6c056fe | 2134 | &DECL_SOURCE_LOCATION (gnu_lb_field)); |
4e6602a8 EB |
2135 | |
2136 | field_name[0] = 'U'; | |
b6c056fe EB |
2137 | gnu_hb_field = create_field_decl (get_identifier (field_name), |
2138 | gnu_index_base_type, | |
da01bfee EB |
2139 | gnu_template_type, NULL_TREE, |
2140 | NULL_TREE, 0, 0); | |
a1ab4c31 | 2141 | Sloc_to_locus (Sloc (gnat_entity), |
b6c056fe | 2142 | &DECL_SOURCE_LOCATION (gnu_hb_field)); |
a1ab4c31 | 2143 | |
b6c056fe | 2144 | gnu_temp_fields[index] = chainon (gnu_lb_field, gnu_hb_field); |
4e6602a8 EB |
2145 | |
2146 | /* We can't use build_component_ref here since the template type | |
2147 | isn't complete yet. */ | |
b6c056fe EB |
2148 | gnu_orig_min = build3 (COMPONENT_REF, gnu_index_base_type, |
2149 | gnu_template_reference, gnu_lb_field, | |
2150 | NULL_TREE); | |
2151 | gnu_orig_max = build3 (COMPONENT_REF, gnu_index_base_type, | |
2152 | gnu_template_reference, gnu_hb_field, | |
2153 | NULL_TREE); | |
2154 | TREE_READONLY (gnu_orig_min) = TREE_READONLY (gnu_orig_max) = 1; | |
2155 | ||
2156 | gnu_min = convert (sizetype, gnu_orig_min); | |
2157 | gnu_max = convert (sizetype, gnu_orig_max); | |
2158 | ||
2159 | /* Compute the size of this dimension. See the E_Array_Subtype | |
2160 | case below for the rationale. */ | |
2161 | gnu_high | |
2162 | = build3 (COND_EXPR, sizetype, | |
2163 | build2 (GE_EXPR, boolean_type_node, | |
2164 | gnu_orig_max, gnu_orig_min), | |
2165 | gnu_max, | |
2166 | size_binop (MINUS_EXPR, gnu_min, size_one_node)); | |
03b6f8a2 | 2167 | |
4e6602a8 | 2168 | /* Make a range type with the new range in the Ada base type. |
03b6f8a2 | 2169 | Then make an index type with the size range in sizetype. */ |
a1ab4c31 | 2170 | gnu_index_types[index] |
b6c056fe | 2171 | = create_index_type (gnu_min, gnu_high, |
4e6602a8 | 2172 | create_range_type (gnu_index_base_type, |
b6c056fe EB |
2173 | gnu_orig_min, |
2174 | gnu_orig_max), | |
a1ab4c31 | 2175 | gnat_entity); |
4e6602a8 EB |
2176 | |
2177 | /* Update the maximum size of the array in elements. */ | |
2178 | if (gnu_max_size) | |
2179 | { | |
4e6602a8 EB |
2180 | tree gnu_min |
2181 | = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type)); | |
2182 | tree gnu_max | |
2183 | = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type)); | |
2184 | tree gnu_this_max | |
33ccc536 EB |
2185 | = size_binop (PLUS_EXPR, size_one_node, |
2186 | size_binop (MINUS_EXPR, gnu_max, gnu_min)); | |
4e6602a8 EB |
2187 | |
2188 | if (TREE_CODE (gnu_this_max) == INTEGER_CST | |
2189 | && TREE_OVERFLOW (gnu_this_max)) | |
2190 | gnu_max_size = NULL_TREE; | |
2191 | else | |
2192 | gnu_max_size | |
2193 | = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); | |
2194 | } | |
a1ab4c31 AC |
2195 | |
2196 | TYPE_NAME (gnu_index_types[index]) | |
2197 | = create_concat_name (gnat_entity, field_name); | |
2198 | } | |
2199 | ||
e3edbd56 EB |
2200 | /* Install all the fields into the template. */ |
2201 | TYPE_NAME (gnu_template_type) | |
2202 | = create_concat_name (gnat_entity, "XUB"); | |
2203 | gnu_template_fields = NULL_TREE; | |
a1ab4c31 AC |
2204 | for (index = 0; index < ndim; index++) |
2205 | gnu_template_fields | |
2206 | = chainon (gnu_template_fields, gnu_temp_fields[index]); | |
032d1b71 EB |
2207 | finish_record_type (gnu_template_type, gnu_template_fields, 0, |
2208 | debug_info_p); | |
a1ab4c31 AC |
2209 | TYPE_READONLY (gnu_template_type) = 1; |
2210 | ||
a1ab4c31 AC |
2211 | /* If Component_Size is not already specified, annotate it with the |
2212 | size of the component. */ | |
2213 | if (Unknown_Component_Size (gnat_entity)) | |
9aa04cc7 AC |
2214 | Set_Component_Size (gnat_entity, |
2215 | annotate_value (TYPE_SIZE (comp_type))); | |
a1ab4c31 | 2216 | |
4e6602a8 EB |
2217 | /* Compute the maximum size of the array in units and bits. */ |
2218 | if (gnu_max_size) | |
2219 | { | |
2220 | gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, | |
9aa04cc7 | 2221 | TYPE_SIZE_UNIT (comp_type)); |
4e6602a8 EB |
2222 | gnu_max_size = size_binop (MULT_EXPR, |
2223 | convert (bitsizetype, gnu_max_size), | |
9aa04cc7 | 2224 | TYPE_SIZE (comp_type)); |
4e6602a8 EB |
2225 | } |
2226 | else | |
2227 | gnu_max_size_unit = NULL_TREE; | |
a1ab4c31 | 2228 | |
4e6602a8 | 2229 | /* Now build the array type. */ |
9aa04cc7 | 2230 | tem = comp_type; |
a1ab4c31 AC |
2231 | for (index = ndim - 1; index >= 0; index--) |
2232 | { | |
523e82a7 | 2233 | tem = build_nonshared_array_type (tem, gnu_index_types[index]); |
a1ab4c31 | 2234 | TYPE_MULTI_ARRAY_P (tem) = (index > 0); |
d42b7559 EB |
2235 | TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p; |
2236 | if (index == ndim - 1 && Reverse_Storage_Order (gnat_entity)) | |
2237 | set_reverse_storage_order_on_array_type (tem); | |
d8e94f79 | 2238 | if (array_type_has_nonaliased_component (tem, gnat_entity)) |
d42b7559 | 2239 | set_nonaliased_component_on_array_type (tem); |
a1ab4c31 AC |
2240 | } |
2241 | ||
feec4372 EB |
2242 | /* If an alignment is specified, use it if valid. But ignore it |
2243 | for the original type of packed array types. If the alignment | |
2244 | was requested with an explicit alignment clause, state so. */ | |
1a4cb227 | 2245 | if (No (Packed_Array_Impl_Type (gnat_entity)) |
a1ab4c31 AC |
2246 | && Known_Alignment (gnat_entity)) |
2247 | { | |
fe37c7af MM |
2248 | SET_TYPE_ALIGN (tem, |
2249 | validate_alignment (Alignment (gnat_entity), | |
2250 | gnat_entity, | |
2251 | TYPE_ALIGN (tem))); | |
a1ab4c31 AC |
2252 | if (Present (Alignment_Clause (gnat_entity))) |
2253 | TYPE_USER_ALIGN (tem) = 1; | |
2254 | } | |
2255 | ||
2d595887 PMR |
2256 | /* Tag top-level ARRAY_TYPE nodes for packed arrays and their |
2257 | implementation types as such so that the debug information back-end | |
2258 | can output the appropriate description for them. */ | |
2259 | TYPE_PACKED (tem) | |
2260 | = (Is_Packed (gnat_entity) | |
2261 | || Is_Packed_Array_Impl_Type (gnat_entity)); | |
2262 | ||
f797c2b7 EB |
2263 | if (Treat_As_Volatile (gnat_entity)) |
2264 | tem = change_qualified_type (tem, TYPE_QUAL_VOLATILE); | |
2265 | ||
e3edbd56 EB |
2266 | /* Adjust the type of the pointer-to-array field of the fat pointer |
2267 | and record the aliasing relationships if necessary. */ | |
a1ab4c31 | 2268 | TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem); |
e3edbd56 EB |
2269 | if (TYPE_ALIAS_SET_KNOWN_P (gnu_fat_type)) |
2270 | record_component_aliases (gnu_fat_type); | |
a1ab4c31 AC |
2271 | |
2272 | /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the | |
2273 | corresponding fat pointer. */ | |
e3edbd56 EB |
2274 | TREE_TYPE (gnu_type) = gnu_fat_type; |
2275 | TYPE_POINTER_TO (gnu_type) = gnu_fat_type; | |
2276 | TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type; | |
6f9f0ce3 | 2277 | SET_TYPE_MODE (gnu_type, BLKmode); |
fe37c7af | 2278 | SET_TYPE_ALIGN (gnu_type, TYPE_ALIGN (tem)); |
a1ab4c31 AC |
2279 | |
2280 | /* If the maximum size doesn't overflow, use it. */ | |
86060344 | 2281 | if (gnu_max_size |
4e6602a8 EB |
2282 | && TREE_CODE (gnu_max_size) == INTEGER_CST |
2283 | && !TREE_OVERFLOW (gnu_max_size) | |
2284 | && TREE_CODE (gnu_max_size_unit) == INTEGER_CST | |
a1ab4c31 | 2285 | && !TREE_OVERFLOW (gnu_max_size_unit)) |
4e6602a8 EB |
2286 | { |
2287 | TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size, | |
2288 | TYPE_SIZE (tem)); | |
2289 | TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit, | |
2290 | TYPE_SIZE_UNIT (tem)); | |
2291 | } | |
a1ab4c31 | 2292 | |
74746d49 | 2293 | create_type_decl (create_concat_name (gnat_entity, "XUA"), tem, |
c1a569ef | 2294 | artificial_p, debug_info_p, gnat_entity); |
a1ab4c31 | 2295 | |
24bd3c6e PMR |
2296 | /* If told to generate GNAT encodings for them (GDB rely on them at the |
2297 | moment): give the fat pointer type a name. If this is a packed | |
2298 | array, tell the debugger how to interpret the underlying bits. */ | |
1a4cb227 AC |
2299 | if (Present (Packed_Array_Impl_Type (gnat_entity))) |
2300 | gnat_name = Packed_Array_Impl_Type (gnat_entity); | |
40c88b94 EB |
2301 | else |
2302 | gnat_name = gnat_entity; | |
773392af PMR |
2303 | tree xup_name |
2304 | = (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) | |
2305 | ? get_entity_name (gnat_name) | |
2306 | : create_concat_name (gnat_name, "XUP"); | |
2307 | create_type_decl (xup_name, gnu_fat_type, artificial_p, debug_info_p, | |
2308 | gnat_entity); | |
a1ab4c31 | 2309 | |
2b45154d EB |
2310 | /* Create the type to be designated by thin pointers: a record type for |
2311 | the array and its template. We used to shift the fields to have the | |
2312 | template at a negative offset, but this was somewhat of a kludge; we | |
2313 | now shift thin pointer values explicitly but only those which have a | |
24bd3c6e PMR |
2314 | TYPE_UNCONSTRAINED_ARRAY attached to the designated RECORD_TYPE. |
2315 | Note that GDB can handle standard DWARF information for them, so we | |
2316 | don't have to name them as a GNAT encoding, except if specifically | |
2317 | asked to. */ | |
773392af PMR |
2318 | tree xut_name |
2319 | = (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) | |
2320 | ? get_entity_name (gnat_name) | |
2321 | : create_concat_name (gnat_name, "XUT"); | |
2322 | tem = build_unc_object_type (gnu_template_type, tem, xut_name, | |
928dfa4b | 2323 | debug_info_p); |
a1ab4c31 AC |
2324 | |
2325 | SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type); | |
2326 | TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem; | |
a1ab4c31 AC |
2327 | } |
2328 | break; | |
2329 | ||
a1ab4c31 AC |
2330 | case E_Array_Subtype: |
2331 | ||
2332 | /* This is the actual data type for array variables. Multidimensional | |
4e6602a8 | 2333 | arrays are implemented as arrays of arrays. Note that arrays which |
7c20033e | 2334 | have sparse enumeration subtypes as index components create sparse |
4e6602a8 EB |
2335 | arrays, which is obviously space inefficient but so much easier to |
2336 | code for now. | |
a1ab4c31 | 2337 | |
4e6602a8 EB |
2338 | Also note that the subtype never refers to the unconstrained array |
2339 | type, which is somewhat at variance with Ada semantics. | |
a1ab4c31 | 2340 | |
4e6602a8 EB |
2341 | First check to see if this is simply a renaming of the array type. |
2342 | If so, the result is the array type. */ | |
a1ab4c31 | 2343 | |
f797c2b7 | 2344 | gnu_type = TYPE_MAIN_VARIANT (gnat_to_gnu_type (Etype (gnat_entity))); |
a1ab4c31 | 2345 | if (!Is_Constrained (gnat_entity)) |
7c20033e | 2346 | ; |
a1ab4c31 AC |
2347 | else |
2348 | { | |
4e6602a8 EB |
2349 | Entity_Id gnat_index, gnat_base_index; |
2350 | const bool convention_fortran_p | |
2351 | = (Convention (gnat_entity) == Convention_Fortran); | |
2352 | const int ndim = Number_Dimensions (gnat_entity); | |
a1ab4c31 | 2353 | tree gnu_base_type = gnu_type; |
2bb1fc26 | 2354 | tree *gnu_index_types = XALLOCAVEC (tree, ndim); |
26383c64 | 2355 | tree gnu_max_size = size_one_node, gnu_max_size_unit; |
a1ab4c31 | 2356 | bool need_index_type_struct = false; |
4e6602a8 | 2357 | int index; |
a1ab4c31 | 2358 | |
4e6602a8 EB |
2359 | /* First create the GCC type for each index and find out whether |
2360 | special types are needed for debugging information. */ | |
2361 | for (index = (convention_fortran_p ? ndim - 1 : 0), | |
2362 | gnat_index = First_Index (gnat_entity), | |
2363 | gnat_base_index | |
a1ab4c31 | 2364 | = First_Index (Implementation_Base_Type (gnat_entity)); |
278f422c | 2365 | IN_RANGE (index, 0, ndim - 1); |
4e6602a8 EB |
2366 | index += (convention_fortran_p ? - 1 : 1), |
2367 | gnat_index = Next_Index (gnat_index), | |
2368 | gnat_base_index = Next_Index (gnat_base_index)) | |
a1ab4c31 | 2369 | { |
4e6602a8 | 2370 | tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); |
825da0d2 EB |
2371 | tree gnu_index_base_type |
2372 | = maybe_character_type (get_base_type (gnu_index_type)); | |
1eb58520 AC |
2373 | tree gnu_orig_min |
2374 | = convert (gnu_index_base_type, | |
2375 | TYPE_MIN_VALUE (gnu_index_type)); | |
2376 | tree gnu_orig_max | |
2377 | = convert (gnu_index_base_type, | |
2378 | TYPE_MAX_VALUE (gnu_index_type)); | |
4e6602a8 EB |
2379 | tree gnu_min = convert (sizetype, gnu_orig_min); |
2380 | tree gnu_max = convert (sizetype, gnu_orig_max); | |
2381 | tree gnu_base_index_type | |
2382 | = get_unpadded_type (Etype (gnat_base_index)); | |
1eb58520 | 2383 | tree gnu_base_index_base_type |
825da0d2 | 2384 | = maybe_character_type (get_base_type (gnu_base_index_type)); |
1eb58520 AC |
2385 | tree gnu_base_orig_min |
2386 | = convert (gnu_base_index_base_type, | |
2387 | TYPE_MIN_VALUE (gnu_base_index_type)); | |
2388 | tree gnu_base_orig_max | |
2389 | = convert (gnu_base_index_base_type, | |
2390 | TYPE_MAX_VALUE (gnu_base_index_type)); | |
728936bb | 2391 | tree gnu_high; |
4e6602a8 EB |
2392 | |
2393 | /* See if the base array type is already flat. If it is, we | |
2394 | are probably compiling an ACATS test but it will cause the | |
2395 | code below to malfunction if we don't handle it specially. */ | |
2396 | if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST | |
2397 | && TREE_CODE (gnu_base_orig_max) == INTEGER_CST | |
2398 | && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min)) | |
a1ab4c31 | 2399 | { |
4e6602a8 EB |
2400 | gnu_min = size_one_node; |
2401 | gnu_max = size_zero_node; | |
feec4372 | 2402 | gnu_high = gnu_max; |
a1ab4c31 AC |
2403 | } |
2404 | ||
4e6602a8 EB |
2405 | /* Similarly, if one of the values overflows in sizetype and the |
2406 | range is null, use 1..0 for the sizetype bounds. */ | |
728936bb | 2407 | else if (TREE_CODE (gnu_min) == INTEGER_CST |
a1ab4c31 AC |
2408 | && TREE_CODE (gnu_max) == INTEGER_CST |
2409 | && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max)) | |
4e6602a8 | 2410 | && tree_int_cst_lt (gnu_orig_max, gnu_orig_min)) |
feec4372 EB |
2411 | { |
2412 | gnu_min = size_one_node; | |
2413 | gnu_max = size_zero_node; | |
2414 | gnu_high = gnu_max; | |
2415 | } | |
a1ab4c31 | 2416 | |
4e6602a8 EB |
2417 | /* If the minimum and maximum values both overflow in sizetype, |
2418 | but the difference in the original type does not overflow in | |
2419 | sizetype, ignore the overflow indication. */ | |
728936bb | 2420 | else if (TREE_CODE (gnu_min) == INTEGER_CST |
4e6602a8 EB |
2421 | && TREE_CODE (gnu_max) == INTEGER_CST |
2422 | && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max) | |
2423 | && !TREE_OVERFLOW | |
2424 | (convert (sizetype, | |
2425 | fold_build2 (MINUS_EXPR, gnu_index_type, | |
2426 | gnu_orig_max, | |
2427 | gnu_orig_min)))) | |
feec4372 | 2428 | { |
4e6602a8 EB |
2429 | TREE_OVERFLOW (gnu_min) = 0; |
2430 | TREE_OVERFLOW (gnu_max) = 0; | |
feec4372 EB |
2431 | gnu_high = gnu_max; |
2432 | } | |
2433 | ||
f45f9664 EB |
2434 | /* Compute the size of this dimension in the general case. We |
2435 | need to provide GCC with an upper bound to use but have to | |
2436 | deal with the "superflat" case. There are three ways to do | |
2437 | this. If we can prove that the array can never be superflat, | |
2438 | we can just use the high bound of the index type. */ | |
728936bb | 2439 | else if ((Nkind (gnat_index) == N_Range |
fc7a823e | 2440 | && cannot_be_superflat (gnat_index)) |
53f3f4e3 | 2441 | /* Bit-Packed Array Impl. Types are never superflat. */ |
1a4cb227 | 2442 | || (Is_Packed_Array_Impl_Type (gnat_entity) |
f9d7d7c1 EB |
2443 | && Is_Bit_Packed_Array |
2444 | (Original_Array_Type (gnat_entity)))) | |
f45f9664 EB |
2445 | gnu_high = gnu_max; |
2446 | ||
728936bb EB |
2447 | /* Otherwise, if the high bound is constant but the low bound is |
2448 | not, we use the expression (hb >= lb) ? lb : hb + 1 for the | |
2449 | lower bound. Note that the comparison must be done in the | |
2450 | original type to avoid any overflow during the conversion. */ | |
2451 | else if (TREE_CODE (gnu_max) == INTEGER_CST | |
2452 | && TREE_CODE (gnu_min) != INTEGER_CST) | |
feec4372 | 2453 | { |
728936bb EB |
2454 | gnu_high = gnu_max; |
2455 | gnu_min | |
2456 | = build_cond_expr (sizetype, | |
2457 | build_binary_op (GE_EXPR, | |
2458 | boolean_type_node, | |
2459 | gnu_orig_max, | |
2460 | gnu_orig_min), | |
2461 | gnu_min, | |
dcbac1a4 EB |
2462 | int_const_binop (PLUS_EXPR, gnu_max, |
2463 | size_one_node)); | |
feec4372 | 2464 | } |
a1ab4c31 | 2465 | |
728936bb EB |
2466 | /* Finally we use (hb >= lb) ? hb : lb - 1 for the upper bound |
2467 | in all the other cases. Note that, here as well as above, | |
2468 | the condition used in the comparison must be equivalent to | |
2469 | the condition (length != 0). This is relied upon in order | |
dcbac1a4 EB |
2470 | to optimize array comparisons in compare_arrays. Moreover |
2471 | we use int_const_binop for the shift by 1 if the bound is | |
2472 | constant to avoid any unwanted overflow. */ | |
728936bb EB |
2473 | else |
2474 | gnu_high | |
2475 | = build_cond_expr (sizetype, | |
2476 | build_binary_op (GE_EXPR, | |
2477 | boolean_type_node, | |
2478 | gnu_orig_max, | |
2479 | gnu_orig_min), | |
2480 | gnu_max, | |
dcbac1a4 EB |
2481 | TREE_CODE (gnu_min) == INTEGER_CST |
2482 | ? int_const_binop (MINUS_EXPR, gnu_min, | |
2483 | size_one_node) | |
2484 | : size_binop (MINUS_EXPR, gnu_min, | |
2485 | size_one_node)); | |
728936bb | 2486 | |
b6c056fe EB |
2487 | /* Reuse the index type for the range type. Then make an index |
2488 | type with the size range in sizetype. */ | |
4e6602a8 EB |
2489 | gnu_index_types[index] |
2490 | = create_index_type (gnu_min, gnu_high, gnu_index_type, | |
a1ab4c31 AC |
2491 | gnat_entity); |
2492 | ||
4e6602a8 | 2493 | /* Update the maximum size of the array in elements. Here we |
a1ab4c31 | 2494 | see if any constraint on the index type of the base type |
4e6602a8 EB |
2495 | can be used in the case of self-referential bound on the |
2496 | index type of the subtype. We look for a non-"infinite" | |
a1ab4c31 AC |
2497 | and non-self-referential bound from any type involved and |
2498 | handle each bound separately. */ | |
4e6602a8 EB |
2499 | if (gnu_max_size) |
2500 | { | |
2501 | tree gnu_base_min = convert (sizetype, gnu_base_orig_min); | |
2502 | tree gnu_base_max = convert (sizetype, gnu_base_orig_max); | |
4e6602a8 EB |
2503 | tree gnu_base_base_min |
2504 | = convert (sizetype, | |
2505 | TYPE_MIN_VALUE (gnu_base_index_base_type)); | |
2506 | tree gnu_base_base_max | |
2507 | = convert (sizetype, | |
2508 | TYPE_MAX_VALUE (gnu_base_index_base_type)); | |
2509 | ||
2510 | if (!CONTAINS_PLACEHOLDER_P (gnu_min) | |
2511 | || !(TREE_CODE (gnu_base_min) == INTEGER_CST | |
2512 | && !TREE_OVERFLOW (gnu_base_min))) | |
2513 | gnu_base_min = gnu_min; | |
2514 | ||
2515 | if (!CONTAINS_PLACEHOLDER_P (gnu_max) | |
2516 | || !(TREE_CODE (gnu_base_max) == INTEGER_CST | |
2517 | && !TREE_OVERFLOW (gnu_base_max))) | |
2518 | gnu_base_max = gnu_max; | |
2519 | ||
2520 | if ((TREE_CODE (gnu_base_min) == INTEGER_CST | |
2521 | && TREE_OVERFLOW (gnu_base_min)) | |
2522 | || operand_equal_p (gnu_base_min, gnu_base_base_min, 0) | |
2523 | || (TREE_CODE (gnu_base_max) == INTEGER_CST | |
2524 | && TREE_OVERFLOW (gnu_base_max)) | |
2525 | || operand_equal_p (gnu_base_max, gnu_base_base_max, 0)) | |
2526 | gnu_max_size = NULL_TREE; | |
2527 | else | |
2528 | { | |
33ccc536 EB |
2529 | tree gnu_this_max; |
2530 | ||
2531 | /* Use int_const_binop if the bounds are constant to | |
2532 | avoid any unwanted overflow. */ | |
2533 | if (TREE_CODE (gnu_base_min) == INTEGER_CST | |
2534 | && TREE_CODE (gnu_base_max) == INTEGER_CST) | |
2535 | gnu_this_max | |
2536 | = int_const_binop (PLUS_EXPR, size_one_node, | |
2537 | int_const_binop (MINUS_EXPR, | |
4e6602a8 | 2538 | gnu_base_max, |
33ccc536 | 2539 | gnu_base_min)); |
4e6602a8 | 2540 | else |
33ccc536 EB |
2541 | gnu_this_max |
2542 | = size_binop (PLUS_EXPR, size_one_node, | |
2543 | size_binop (MINUS_EXPR, | |
2544 | gnu_base_max, | |
2545 | gnu_base_min)); | |
2546 | ||
2547 | gnu_max_size | |
2548 | = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); | |
4e6602a8 EB |
2549 | } |
2550 | } | |
a1ab4c31 | 2551 | |
4e6602a8 EB |
2552 | /* We need special types for debugging information to point to |
2553 | the index types if they have variable bounds, are not integer | |
24bd3c6e PMR |
2554 | types, are biased or are wider than sizetype. These are GNAT |
2555 | encodings, so we have to include them only when all encodings | |
2556 | are requested. */ | |
7c775aca EB |
2557 | if ((TREE_CODE (gnu_orig_min) != INTEGER_CST |
2558 | || TREE_CODE (gnu_orig_max) != INTEGER_CST | |
2559 | || TREE_CODE (gnu_index_type) != INTEGER_TYPE | |
2560 | || (TREE_TYPE (gnu_index_type) | |
2561 | && TREE_CODE (TREE_TYPE (gnu_index_type)) | |
2562 | != INTEGER_TYPE) | |
2563 | || TYPE_BIASED_REPRESENTATION_P (gnu_index_type)) | |
2564 | && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) | |
a1ab4c31 AC |
2565 | need_index_type_struct = true; |
2566 | } | |
2567 | ||
2568 | /* Then flatten: create the array of arrays. For an array type | |
2569 | used to implement a packed array, get the component type from | |
2570 | the original array type since the representation clauses that | |
2571 | can affect it are on the latter. */ | |
1a4cb227 | 2572 | if (Is_Packed_Array_Impl_Type (gnat_entity) |
a1ab4c31 AC |
2573 | && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
2574 | { | |
2575 | gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity)); | |
4e6602a8 | 2576 | for (index = ndim - 1; index >= 0; index--) |
a1ab4c31 AC |
2577 | gnu_type = TREE_TYPE (gnu_type); |
2578 | ||
2579 | /* One of the above calls might have caused us to be elaborated, | |
2580 | so don't blow up if so. */ | |
2581 | if (present_gnu_tree (gnat_entity)) | |
2582 | { | |
2583 | maybe_present = true; | |
2584 | break; | |
2585 | } | |
2586 | } | |
2587 | else | |
2588 | { | |
2cac6017 EB |
2589 | gnu_type = gnat_to_gnu_component_type (gnat_entity, definition, |
2590 | debug_info_p); | |
a1ab4c31 AC |
2591 | |
2592 | /* One of the above calls might have caused us to be elaborated, | |
2593 | so don't blow up if so. */ | |
2594 | if (present_gnu_tree (gnat_entity)) | |
2595 | { | |
2596 | maybe_present = true; | |
2597 | break; | |
2598 | } | |
a1ab4c31 AC |
2599 | } |
2600 | ||
4e6602a8 EB |
2601 | /* Compute the maximum size of the array in units and bits. */ |
2602 | if (gnu_max_size) | |
2603 | { | |
2604 | gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, | |
2605 | TYPE_SIZE_UNIT (gnu_type)); | |
2606 | gnu_max_size = size_binop (MULT_EXPR, | |
2607 | convert (bitsizetype, gnu_max_size), | |
2608 | TYPE_SIZE (gnu_type)); | |
2609 | } | |
2610 | else | |
2611 | gnu_max_size_unit = NULL_TREE; | |
a1ab4c31 | 2612 | |
4e6602a8 EB |
2613 | /* Now build the array type. */ |
2614 | for (index = ndim - 1; index >= 0; index --) | |
a1ab4c31 | 2615 | { |
523e82a7 EB |
2616 | gnu_type = build_nonshared_array_type (gnu_type, |
2617 | gnu_index_types[index]); | |
a1ab4c31 | 2618 | TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0); |
d42b7559 EB |
2619 | TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p; |
2620 | if (index == ndim - 1 && Reverse_Storage_Order (gnat_entity)) | |
2621 | set_reverse_storage_order_on_array_type (gnu_type); | |
d8e94f79 | 2622 | if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) |
d42b7559 | 2623 | set_nonaliased_component_on_array_type (gnu_type); |
a1ab4c31 AC |
2624 | } |
2625 | ||
2d595887 | 2626 | /* Strip the ___XP suffix for standard DWARF. */ |
7c775aca EB |
2627 | if (Is_Packed_Array_Impl_Type (gnat_entity) |
2628 | && gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) | |
2d595887 PMR |
2629 | { |
2630 | Entity_Id gnat_original_array_type | |
2631 | = Underlying_Type (Original_Array_Type (gnat_entity)); | |
2632 | ||
2633 | gnu_entity_name | |
2634 | = get_entity_name (gnat_original_array_type); | |
2635 | } | |
2636 | ||
10069d53 | 2637 | /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
4fd78fe6 EB |
2638 | TYPE_STUB_DECL (gnu_type) |
2639 | = create_type_stub_decl (gnu_entity_name, gnu_type); | |
10069d53 | 2640 | |
b0ad2d78 | 2641 | /* If this is a multi-dimensional array and we are at global level, |
4e6602a8 | 2642 | we need to make a variable corresponding to the stride of the |
a1ab4c31 | 2643 | inner dimensions. */ |
b0ad2d78 | 2644 | if (ndim > 1 && global_bindings_p ()) |
a1ab4c31 | 2645 | { |
a1ab4c31 AC |
2646 | tree gnu_arr_type; |
2647 | ||
bf44701f | 2648 | for (gnu_arr_type = TREE_TYPE (gnu_type), index = 1; |
a1ab4c31 | 2649 | TREE_CODE (gnu_arr_type) == ARRAY_TYPE; |
bf44701f | 2650 | gnu_arr_type = TREE_TYPE (gnu_arr_type), index++) |
a1ab4c31 AC |
2651 | { |
2652 | tree eltype = TREE_TYPE (gnu_arr_type); | |
bf44701f | 2653 | char stride_name[32]; |
a1ab4c31 | 2654 | |
bf44701f | 2655 | sprintf (stride_name, "ST%d", index); |
a1ab4c31 | 2656 | TYPE_SIZE (gnu_arr_type) |
a531043b | 2657 | = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type), |
bf44701f | 2658 | gnat_entity, stride_name, |
a531043b | 2659 | definition, false); |
a1ab4c31 AC |
2660 | |
2661 | /* ??? For now, store the size as a multiple of the | |
2662 | alignment of the element type in bytes so that we | |
2663 | can see the alignment from the tree. */ | |
bf44701f | 2664 | sprintf (stride_name, "ST%d_A_UNIT", index); |
a1ab4c31 | 2665 | TYPE_SIZE_UNIT (gnu_arr_type) |
da01bfee | 2666 | = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_arr_type), |
bf44701f | 2667 | gnat_entity, stride_name, |
da01bfee EB |
2668 | definition, false, |
2669 | TYPE_ALIGN (eltype)); | |
a1ab4c31 AC |
2670 | |
2671 | /* ??? create_type_decl is not invoked on the inner types so | |
2672 | the MULT_EXPR node built above will never be marked. */ | |
3f13dd77 | 2673 | MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type)); |
a1ab4c31 AC |
2674 | } |
2675 | } | |
2676 | ||
4fd78fe6 EB |
2677 | /* If we need to write out a record type giving the names of the |
2678 | bounds for debugging purposes, do it now and make the record | |
2679 | type a parallel type. This is not needed for a packed array | |
2680 | since the bounds are conveyed by the original array type. */ | |
2681 | if (need_index_type_struct | |
2682 | && debug_info_p | |
1a4cb227 | 2683 | && !Is_Packed_Array_Impl_Type (gnat_entity)) |
a1ab4c31 | 2684 | { |
10069d53 | 2685 | tree gnu_bound_rec = make_node (RECORD_TYPE); |
a1ab4c31 AC |
2686 | tree gnu_field_list = NULL_TREE; |
2687 | tree gnu_field; | |
2688 | ||
10069d53 | 2689 | TYPE_NAME (gnu_bound_rec) |
a1ab4c31 AC |
2690 | = create_concat_name (gnat_entity, "XA"); |
2691 | ||
4e6602a8 | 2692 | for (index = ndim - 1; index >= 0; index--) |
a1ab4c31 | 2693 | { |
4e6602a8 | 2694 | tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]); |
9dba4b55 | 2695 | tree gnu_index_name = TYPE_IDENTIFIER (gnu_index); |
a1ab4c31 | 2696 | |
4fd78fe6 EB |
2697 | /* Make sure to reference the types themselves, and not just |
2698 | their names, as the debugger may fall back on them. */ | |
10069d53 | 2699 | gnu_field = create_field_decl (gnu_index_name, gnu_index, |
da01bfee EB |
2700 | gnu_bound_rec, NULL_TREE, |
2701 | NULL_TREE, 0, 0); | |
910ad8de | 2702 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 AC |
2703 | gnu_field_list = gnu_field; |
2704 | } | |
2705 | ||
032d1b71 | 2706 | finish_record_type (gnu_bound_rec, gnu_field_list, 0, true); |
a5695aa2 | 2707 | add_parallel_type (gnu_type, gnu_bound_rec); |
a1ab4c31 AC |
2708 | } |
2709 | ||
583eb0c9 | 2710 | /* If this is a packed array type, make the original array type a |
2d595887 PMR |
2711 | parallel/debug type. Otherwise, if such GNAT encodings are |
2712 | required, do it for the base array type if it isn't artificial to | |
2713 | make sure it is kept in the debug info. */ | |
583eb0c9 EB |
2714 | if (debug_info_p) |
2715 | { | |
1eb58520 | 2716 | if (Is_Packed_Array_Impl_Type (gnat_entity)) |
2d595887 PMR |
2717 | associate_original_type_to_packed_array (gnu_type, |
2718 | gnat_entity); | |
583eb0c9 EB |
2719 | else |
2720 | { | |
2721 | tree gnu_base_decl | |
afc737f0 EB |
2722 | = gnat_to_gnu_entity (Etype (gnat_entity), NULL_TREE, |
2723 | false); | |
7c775aca EB |
2724 | if (!DECL_ARTIFICIAL (gnu_base_decl) |
2725 | && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) | |
a5695aa2 | 2726 | add_parallel_type (gnu_type, |
583eb0c9 EB |
2727 | TREE_TYPE (TREE_TYPE (gnu_base_decl))); |
2728 | } | |
2729 | } | |
4fd78fe6 | 2730 | |
a1ab4c31 | 2731 | TYPE_PACKED_ARRAY_TYPE_P (gnu_type) |
1a4cb227 | 2732 | = (Is_Packed_Array_Impl_Type (gnat_entity) |
a1ab4c31 AC |
2733 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))); |
2734 | ||
2d595887 PMR |
2735 | /* Tag top-level ARRAY_TYPE nodes for packed arrays and their |
2736 | implementation types as such so that the debug information back-end | |
2737 | can output the appropriate description for them. */ | |
2738 | TYPE_PACKED (gnu_type) | |
2739 | = (Is_Packed (gnat_entity) | |
2740 | || Is_Packed_Array_Impl_Type (gnat_entity)); | |
2741 | ||
4e6602a8 | 2742 | /* If the size is self-referential and the maximum size doesn't |
a1ab4c31 AC |
2743 | overflow, use it. */ |
2744 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
4e6602a8 | 2745 | && gnu_max_size |
a1ab4c31 AC |
2746 | && !(TREE_CODE (gnu_max_size) == INTEGER_CST |
2747 | && TREE_OVERFLOW (gnu_max_size)) | |
2748 | && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST | |
4e6602a8 | 2749 | && TREE_OVERFLOW (gnu_max_size_unit))) |
a1ab4c31 AC |
2750 | { |
2751 | TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size, | |
2752 | TYPE_SIZE (gnu_type)); | |
2753 | TYPE_SIZE_UNIT (gnu_type) | |
2754 | = size_binop (MIN_EXPR, gnu_max_size_unit, | |
2755 | TYPE_SIZE_UNIT (gnu_type)); | |
2756 | } | |
2757 | ||
2758 | /* Set our alias set to that of our base type. This gives all | |
2759 | array subtypes the same alias set. */ | |
794511d2 | 2760 | relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY); |
a1ab4c31 | 2761 | |
7c20033e EB |
2762 | /* If this is a packed type, make this type the same as the packed |
2763 | array type, but do some adjusting in the type first. */ | |
1a4cb227 | 2764 | if (Present (Packed_Array_Impl_Type (gnat_entity))) |
a1ab4c31 | 2765 | { |
7c20033e EB |
2766 | Entity_Id gnat_index; |
2767 | tree gnu_inner; | |
2768 | ||
2769 | /* First finish the type we had been making so that we output | |
2770 | debugging information for it. */ | |
74746d49 | 2771 | process_attributes (&gnu_type, &attr_list, false, gnat_entity); |
7c20033e | 2772 | if (Treat_As_Volatile (gnat_entity)) |
f797c2b7 EB |
2773 | { |
2774 | const int quals | |
2775 | = TYPE_QUAL_VOLATILE | |
2776 | | (Is_Atomic_Or_VFA (gnat_entity) ? TYPE_QUAL_ATOMIC : 0); | |
2777 | gnu_type = change_qualified_type (gnu_type, quals); | |
2778 | } | |
7c20033e EB |
2779 | /* Make it artificial only if the base type was artificial too. |
2780 | That's sort of "morally" true and will make it possible for | |
2781 | the debugger to look it up by name in DWARF, which is needed | |
2782 | in order to decode the packed array type. */ | |
2783 | gnu_decl | |
74746d49 | 2784 | = create_type_decl (gnu_entity_name, gnu_type, |
7c20033e | 2785 | !Comes_From_Source (Etype (gnat_entity)) |
c1a569ef EB |
2786 | && artificial_p, debug_info_p, |
2787 | gnat_entity); | |
7c20033e EB |
2788 | |
2789 | /* Save it as our equivalent in case the call below elaborates | |
2790 | this type again. */ | |
2791 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
2792 | ||
1a4cb227 AC |
2793 | gnu_decl |
2794 | = gnat_to_gnu_entity (Packed_Array_Impl_Type (gnat_entity), | |
afc737f0 | 2795 | NULL_TREE, false); |
7c20033e EB |
2796 | this_made_decl = true; |
2797 | gnu_type = TREE_TYPE (gnu_decl); | |
2798 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
d5ebeb8c EB |
2799 | save_gnu_tree (gnat_entity, gnu_decl, false); |
2800 | saved = true; | |
7c20033e EB |
2801 | |
2802 | gnu_inner = gnu_type; | |
2803 | while (TREE_CODE (gnu_inner) == RECORD_TYPE | |
2804 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner) | |
315cff15 | 2805 | || TYPE_PADDING_P (gnu_inner))) |
7c20033e EB |
2806 | gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner)); |
2807 | ||
2808 | /* We need to attach the index type to the type we just made so | |
2809 | that the actual bounds can later be put into a template. */ | |
2810 | if ((TREE_CODE (gnu_inner) == ARRAY_TYPE | |
2811 | && !TYPE_ACTUAL_BOUNDS (gnu_inner)) | |
2812 | || (TREE_CODE (gnu_inner) == INTEGER_TYPE | |
2813 | && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner))) | |
a1ab4c31 | 2814 | { |
7c20033e | 2815 | if (TREE_CODE (gnu_inner) == INTEGER_TYPE) |
a1ab4c31 | 2816 | { |
7c20033e EB |
2817 | /* The TYPE_ACTUAL_BOUNDS field is overloaded with the |
2818 | TYPE_MODULUS for modular types so we make an extra | |
2819 | subtype if necessary. */ | |
2820 | if (TYPE_MODULAR_P (gnu_inner)) | |
2821 | { | |
2822 | tree gnu_subtype | |
2823 | = make_unsigned_type (TYPE_PRECISION (gnu_inner)); | |
2824 | TREE_TYPE (gnu_subtype) = gnu_inner; | |
2825 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; | |
2826 | SET_TYPE_RM_MIN_VALUE (gnu_subtype, | |
2827 | TYPE_MIN_VALUE (gnu_inner)); | |
2828 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, | |
2829 | TYPE_MAX_VALUE (gnu_inner)); | |
2830 | gnu_inner = gnu_subtype; | |
2831 | } | |
2832 | ||
2833 | TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1; | |
26383c64 | 2834 | |
7c20033e | 2835 | /* Check for other cases of overloading. */ |
9abe8b74 | 2836 | gcc_checking_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner)); |
7c20033e | 2837 | } |
a1ab4c31 | 2838 | |
7c20033e EB |
2839 | for (gnat_index = First_Index (gnat_entity); |
2840 | Present (gnat_index); | |
2841 | gnat_index = Next_Index (gnat_index)) | |
2842 | SET_TYPE_ACTUAL_BOUNDS | |
2843 | (gnu_inner, | |
2844 | tree_cons (NULL_TREE, | |
2845 | get_unpadded_type (Etype (gnat_index)), | |
2846 | TYPE_ACTUAL_BOUNDS (gnu_inner))); | |
2847 | ||
2848 | if (Convention (gnat_entity) != Convention_Fortran) | |
2849 | SET_TYPE_ACTUAL_BOUNDS | |
2850 | (gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner))); | |
2851 | ||
2852 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
2853 | && TYPE_JUSTIFIED_MODULAR_P (gnu_type)) | |
2854 | TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner; | |
2855 | } | |
a1ab4c31 | 2856 | } |
7c20033e | 2857 | } |
a1ab4c31 AC |
2858 | break; |
2859 | ||
2860 | case E_String_Literal_Subtype: | |
2ddc34ba | 2861 | /* Create the type for a string literal. */ |
a1ab4c31 AC |
2862 | { |
2863 | Entity_Id gnat_full_type | |
7ed9919d | 2864 | = (Is_Private_Type (Etype (gnat_entity)) |
a1ab4c31 AC |
2865 | && Present (Full_View (Etype (gnat_entity))) |
2866 | ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity)); | |
2867 | tree gnu_string_type = get_unpadded_type (gnat_full_type); | |
2868 | tree gnu_string_array_type | |
2869 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type)))); | |
2870 | tree gnu_string_index_type | |
2871 | = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE | |
2872 | (TYPE_DOMAIN (gnu_string_array_type)))); | |
2873 | tree gnu_lower_bound | |
2874 | = convert (gnu_string_index_type, | |
2875 | gnat_to_gnu (String_Literal_Low_Bound (gnat_entity))); | |
f54ee980 EB |
2876 | tree gnu_length |
2877 | = UI_To_gnu (String_Literal_Length (gnat_entity), | |
2878 | gnu_string_index_type); | |
a1ab4c31 AC |
2879 | tree gnu_upper_bound |
2880 | = build_binary_op (PLUS_EXPR, gnu_string_index_type, | |
2881 | gnu_lower_bound, | |
f54ee980 | 2882 | int_const_binop (MINUS_EXPR, gnu_length, |
8b9aec86 RS |
2883 | convert (gnu_string_index_type, |
2884 | integer_one_node))); | |
a1ab4c31 | 2885 | tree gnu_index_type |
c1abd261 EB |
2886 | = create_index_type (convert (sizetype, gnu_lower_bound), |
2887 | convert (sizetype, gnu_upper_bound), | |
84fb43a1 EB |
2888 | create_range_type (gnu_string_index_type, |
2889 | gnu_lower_bound, | |
2890 | gnu_upper_bound), | |
c1abd261 | 2891 | gnat_entity); |
a1ab4c31 AC |
2892 | |
2893 | gnu_type | |
523e82a7 EB |
2894 | = build_nonshared_array_type (gnat_to_gnu_type |
2895 | (Component_Type (gnat_entity)), | |
2896 | gnu_index_type); | |
d8e94f79 | 2897 | if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) |
d42b7559 | 2898 | set_nonaliased_component_on_array_type (gnu_type); |
794511d2 | 2899 | relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY); |
a1ab4c31 AC |
2900 | } |
2901 | break; | |
2902 | ||
2903 | /* Record Types and Subtypes | |
2904 | ||
2905 | The following fields are defined on record types: | |
2906 | ||
2907 | Has_Discriminants True if the record has discriminants | |
2908 | First_Discriminant Points to head of list of discriminants | |
2909 | First_Entity Points to head of list of fields | |
2910 | Is_Tagged_Type True if the record is tagged | |
2911 | ||
2912 | Implementation of Ada records and discriminated records: | |
2913 | ||
2914 | A record type definition is transformed into the equivalent of a C | |
2915 | struct definition. The fields that are the discriminants which are | |
2916 | found in the Full_Type_Declaration node and the elements of the | |
2917 | Component_List found in the Record_Type_Definition node. The | |
2918 | Component_List can be a recursive structure since each Variant of | |
2919 | the Variant_Part of the Component_List has a Component_List. | |
2920 | ||
2921 | Processing of a record type definition comprises starting the list of | |
2922 | field declarations here from the discriminants and the calling the | |
2923 | function components_to_record to add the rest of the fields from the | |
2ddc34ba | 2924 | component list and return the gnu type node. The function |
a1ab4c31 AC |
2925 | components_to_record will call itself recursively as it traverses |
2926 | the tree. */ | |
2927 | ||
2928 | case E_Record_Type: | |
2929 | if (Has_Complex_Representation (gnat_entity)) | |
2930 | { | |
2931 | gnu_type | |
2932 | = build_complex_type | |
2933 | (get_unpadded_type | |
2934 | (Etype (Defining_Entity | |
2935 | (First (Component_Items | |
2936 | (Component_List | |
2937 | (Type_Definition | |
2938 | (Declaration_Node (gnat_entity))))))))); | |
2939 | ||
2940 | break; | |
2941 | } | |
2942 | ||
2943 | { | |
2944 | Node_Id full_definition = Declaration_Node (gnat_entity); | |
2945 | Node_Id record_definition = Type_Definition (full_definition); | |
908ba941 | 2946 | Node_Id gnat_constr; |
05dbb83f | 2947 | Entity_Id gnat_field, gnat_parent_type; |
908ba941 EB |
2948 | tree gnu_field, gnu_field_list = NULL_TREE; |
2949 | tree gnu_get_parent; | |
a1ab4c31 | 2950 | /* Set PACKED in keeping with gnat_to_gnu_field. */ |
908ba941 | 2951 | const int packed |
a1ab4c31 AC |
2952 | = Is_Packed (gnat_entity) |
2953 | ? 1 | |
2954 | : Component_Alignment (gnat_entity) == Calign_Storage_Unit | |
2955 | ? -1 | |
14ecca2e EB |
2956 | : 0; |
2957 | const bool has_align = Known_Alignment (gnat_entity); | |
908ba941 EB |
2958 | const bool has_discr = Has_Discriminants (gnat_entity); |
2959 | const bool has_rep = Has_Specified_Layout (gnat_entity); | |
2960 | const bool is_extension | |
a1ab4c31 AC |
2961 | = (Is_Tagged_Type (gnat_entity) |
2962 | && Nkind (record_definition) == N_Derived_Type_Definition); | |
908ba941 EB |
2963 | const bool is_unchecked_union = Is_Unchecked_Union (gnat_entity); |
2964 | bool all_rep = has_rep; | |
a1ab4c31 AC |
2965 | |
2966 | /* See if all fields have a rep clause. Stop when we find one | |
2967 | that doesn't. */ | |
8cd28148 EB |
2968 | if (all_rep) |
2969 | for (gnat_field = First_Entity (gnat_entity); | |
2970 | Present (gnat_field); | |
2971 | gnat_field = Next_Entity (gnat_field)) | |
2972 | if ((Ekind (gnat_field) == E_Component | |
2973 | || Ekind (gnat_field) == E_Discriminant) | |
2974 | && No (Component_Clause (gnat_field))) | |
2975 | { | |
2976 | all_rep = false; | |
2977 | break; | |
2978 | } | |
a1ab4c31 AC |
2979 | |
2980 | /* If this is a record extension, go a level further to find the | |
2981 | record definition. Also, verify we have a Parent_Subtype. */ | |
2982 | if (is_extension) | |
2983 | { | |
2984 | if (!type_annotate_only | |
2985 | || Present (Record_Extension_Part (record_definition))) | |
2986 | record_definition = Record_Extension_Part (record_definition); | |
2987 | ||
2988 | gcc_assert (type_annotate_only | |
2989 | || Present (Parent_Subtype (gnat_entity))); | |
2990 | } | |
2991 | ||
2992 | /* Make a node for the record. If we are not defining the record, | |
2993 | suppress expanding incomplete types. */ | |
2994 | gnu_type = make_node (tree_code_for_record_type (gnat_entity)); | |
0fb2335d | 2995 | TYPE_NAME (gnu_type) = gnu_entity_name; |
14ecca2e | 2996 | TYPE_PACKED (gnu_type) = (packed != 0) || has_align || has_rep; |
ee45a32d EB |
2997 | TYPE_REVERSE_STORAGE_ORDER (gnu_type) |
2998 | = Reverse_Storage_Order (gnat_entity); | |
74746d49 | 2999 | process_attributes (&gnu_type, &attr_list, true, gnat_entity); |
a1ab4c31 AC |
3000 | |
3001 | if (!definition) | |
8cd28148 EB |
3002 | { |
3003 | defer_incomplete_level++; | |
3004 | this_deferred = true; | |
3005 | } | |
a1ab4c31 | 3006 | |
14ecca2e EB |
3007 | /* If both a size and rep clause were specified, put the size on |
3008 | the record type now so that it can get the proper layout. */ | |
fc893455 AC |
3009 | if (has_rep && Known_RM_Size (gnat_entity)) |
3010 | TYPE_SIZE (gnu_type) | |
3011 | = UI_To_gnu (RM_Size (gnat_entity), bitsizetype); | |
a1ab4c31 | 3012 | |
14ecca2e EB |
3013 | /* Always set the alignment on the record type here so that it can |
3014 | get the proper layout. */ | |
3015 | if (has_align) | |
fe37c7af MM |
3016 | SET_TYPE_ALIGN (gnu_type, |
3017 | validate_alignment (Alignment (gnat_entity), | |
3018 | gnat_entity, 0)); | |
14ecca2e | 3019 | else |
a1ab4c31 | 3020 | { |
fe37c7af | 3021 | SET_TYPE_ALIGN (gnu_type, 0); |
14ecca2e EB |
3022 | |
3023 | /* If a type needs strict alignment, the minimum size will be the | |
3024 | type size instead of the RM size (see validate_size). Cap the | |
3025 | alignment lest it causes this type size to become too large. */ | |
3026 | if (Strict_Alignment (gnat_entity) && Known_RM_Size (gnat_entity)) | |
3027 | { | |
3028 | unsigned int max_size = UI_To_Int (RM_Size (gnat_entity)); | |
3029 | unsigned int max_align = max_size & -max_size; | |
3030 | if (max_align < BIGGEST_ALIGNMENT) | |
3031 | TYPE_MAX_ALIGN (gnu_type) = max_align; | |
3032 | } | |
a1ab4c31 | 3033 | } |
a1ab4c31 AC |
3034 | |
3035 | /* If we have a Parent_Subtype, make a field for the parent. If | |
3036 | this record has rep clauses, force the position to zero. */ | |
3037 | if (Present (Parent_Subtype (gnat_entity))) | |
3038 | { | |
3039 | Entity_Id gnat_parent = Parent_Subtype (gnat_entity); | |
08cb7d42 | 3040 | tree gnu_dummy_parent_type = make_node (RECORD_TYPE); |
a1ab4c31 | 3041 | tree gnu_parent; |
04bc3c93 | 3042 | int parent_packed = 0; |
a1ab4c31 AC |
3043 | |
3044 | /* A major complexity here is that the parent subtype will | |
a8c4c75a EB |
3045 | reference our discriminants in its Stored_Constraint list. |
3046 | But those must reference the parent component of this record | |
3047 | which is precisely of the parent subtype we have not built yet! | |
a1ab4c31 AC |
3048 | To break the circle we first build a dummy COMPONENT_REF which |
3049 | represents the "get to the parent" operation and initialize | |
3050 | each of those discriminants to a COMPONENT_REF of the above | |
3051 | dummy parent referencing the corresponding discriminant of the | |
3052 | base type of the parent subtype. */ | |
08cb7d42 | 3053 | gnu_get_parent = build3 (COMPONENT_REF, gnu_dummy_parent_type, |
a1ab4c31 | 3054 | build0 (PLACEHOLDER_EXPR, gnu_type), |
c172df28 AH |
3055 | build_decl (input_location, |
3056 | FIELD_DECL, NULL_TREE, | |
08cb7d42 | 3057 | gnu_dummy_parent_type), |
a1ab4c31 AC |
3058 | NULL_TREE); |
3059 | ||
c244bf8f | 3060 | if (has_discr) |
a1ab4c31 AC |
3061 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
3062 | Present (gnat_field); | |
3063 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
3064 | if (Present (Corresponding_Discriminant (gnat_field))) | |
e99c3ccc EB |
3065 | { |
3066 | tree gnu_field | |
3067 | = gnat_to_gnu_field_decl (Corresponding_Discriminant | |
3068 | (gnat_field)); | |
3069 | save_gnu_tree | |
3070 | (gnat_field, | |
3071 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
3072 | gnu_get_parent, gnu_field, NULL_TREE), | |
3073 | true); | |
3074 | } | |
a1ab4c31 | 3075 | |
77022fa8 EB |
3076 | /* Then we build the parent subtype. If it has discriminants but |
3077 | the type itself has unknown discriminants, this means that it | |
3078 | doesn't contain information about how the discriminants are | |
3079 | derived from those of the ancestor type, so it cannot be used | |
3080 | directly. Instead it is built by cloning the parent subtype | |
3081 | of the underlying record view of the type, for which the above | |
3082 | derivation of discriminants has been made explicit. */ | |
3083 | if (Has_Discriminants (gnat_parent) | |
3084 | && Has_Unknown_Discriminants (gnat_entity)) | |
3085 | { | |
3086 | Entity_Id gnat_uview = Underlying_Record_View (gnat_entity); | |
3087 | ||
3088 | /* If we are defining the type, the underlying record | |
3089 | view must already have been elaborated at this point. | |
3090 | Otherwise do it now as its parent subtype cannot be | |
3091 | technically elaborated on its own. */ | |
3092 | if (definition) | |
3093 | gcc_assert (present_gnu_tree (gnat_uview)); | |
3094 | else | |
afc737f0 | 3095 | gnat_to_gnu_entity (gnat_uview, NULL_TREE, false); |
77022fa8 EB |
3096 | |
3097 | gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview)); | |
3098 | ||
3099 | /* Substitute the "get to the parent" of the type for that | |
3100 | of its underlying record view in the cloned type. */ | |
3101 | for (gnat_field = First_Stored_Discriminant (gnat_uview); | |
3102 | Present (gnat_field); | |
3103 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
3104 | if (Present (Corresponding_Discriminant (gnat_field))) | |
3105 | { | |
c6bd4220 | 3106 | tree gnu_field = gnat_to_gnu_field_decl (gnat_field); |
77022fa8 EB |
3107 | tree gnu_ref |
3108 | = build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
3109 | gnu_get_parent, gnu_field, NULL_TREE); | |
3110 | gnu_parent | |
3111 | = substitute_in_type (gnu_parent, gnu_field, gnu_ref); | |
3112 | } | |
3113 | } | |
3114 | else | |
3115 | gnu_parent = gnat_to_gnu_type (gnat_parent); | |
a1ab4c31 | 3116 | |
8c41a1c8 EB |
3117 | /* The parent field needs strict alignment so, if it is to |
3118 | be created with a component clause below, then we need | |
3119 | to apply the same adjustment as in gnat_to_gnu_field. */ | |
3120 | if (has_rep && TYPE_ALIGN (gnu_type) < TYPE_ALIGN (gnu_parent)) | |
04bc3c93 EB |
3121 | { |
3122 | /* ??? For historical reasons, we do it on strict-alignment | |
3123 | platforms only, where it is really required. This means | |
3124 | that a confirming representation clause will change the | |
3125 | behavior of the compiler on the other platforms. */ | |
3126 | if (STRICT_ALIGNMENT) | |
3127 | SET_TYPE_ALIGN (gnu_type, TYPE_ALIGN (gnu_parent)); | |
3128 | else | |
3129 | parent_packed | |
3130 | = adjust_packed (gnu_parent, gnu_type, parent_packed); | |
3131 | } | |
8c41a1c8 | 3132 | |
a1ab4c31 AC |
3133 | /* Finally we fix up both kinds of twisted COMPONENT_REF we have |
3134 | initially built. The discriminants must reference the fields | |
3135 | of the parent subtype and not those of its base type for the | |
3136 | placeholder machinery to properly work. */ | |
c244bf8f | 3137 | if (has_discr) |
cdaa0e0b EB |
3138 | { |
3139 | /* The actual parent subtype is the full view. */ | |
7ed9919d | 3140 | if (Is_Private_Type (gnat_parent)) |
a1ab4c31 | 3141 | { |
cdaa0e0b EB |
3142 | if (Present (Full_View (gnat_parent))) |
3143 | gnat_parent = Full_View (gnat_parent); | |
3144 | else | |
3145 | gnat_parent = Underlying_Full_View (gnat_parent); | |
a1ab4c31 AC |
3146 | } |
3147 | ||
cdaa0e0b EB |
3148 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
3149 | Present (gnat_field); | |
3150 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
3151 | if (Present (Corresponding_Discriminant (gnat_field))) | |
3152 | { | |
e028b0bb | 3153 | Entity_Id field; |
cdaa0e0b EB |
3154 | for (field = First_Stored_Discriminant (gnat_parent); |
3155 | Present (field); | |
3156 | field = Next_Stored_Discriminant (field)) | |
3157 | if (same_discriminant_p (gnat_field, field)) | |
3158 | break; | |
3159 | gcc_assert (Present (field)); | |
3160 | TREE_OPERAND (get_gnu_tree (gnat_field), 1) | |
3161 | = gnat_to_gnu_field_decl (field); | |
3162 | } | |
3163 | } | |
3164 | ||
a1ab4c31 AC |
3165 | /* The "get to the parent" COMPONENT_REF must be given its |
3166 | proper type... */ | |
3167 | TREE_TYPE (gnu_get_parent) = gnu_parent; | |
3168 | ||
8cd28148 | 3169 | /* ...and reference the _Parent field of this record. */ |
a6a29d0c | 3170 | gnu_field |
76af763d | 3171 | = create_field_decl (parent_name_id, |
da01bfee | 3172 | gnu_parent, gnu_type, |
c244bf8f EB |
3173 | has_rep |
3174 | ? TYPE_SIZE (gnu_parent) : NULL_TREE, | |
3175 | has_rep | |
da01bfee | 3176 | ? bitsize_zero_node : NULL_TREE, |
04bc3c93 | 3177 | parent_packed, 1); |
a6a29d0c EB |
3178 | DECL_INTERNAL_P (gnu_field) = 1; |
3179 | TREE_OPERAND (gnu_get_parent, 1) = gnu_field; | |
3180 | TYPE_FIELDS (gnu_type) = gnu_field; | |
a1ab4c31 AC |
3181 | } |
3182 | ||
3183 | /* Make the fields for the discriminants and put them into the record | |
3184 | unless it's an Unchecked_Union. */ | |
c244bf8f | 3185 | if (has_discr) |
a1ab4c31 AC |
3186 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
3187 | Present (gnat_field); | |
3188 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
3189 | { | |
8cd28148 EB |
3190 | /* If this is a record extension and this discriminant is the |
3191 | renaming of another discriminant, we've handled it above. */ | |
05dbb83f | 3192 | if (is_extension |
c00d5b12 EB |
3193 | && Present (Corresponding_Discriminant (gnat_field))) |
3194 | continue; | |
3195 | ||
a1ab4c31 | 3196 | gnu_field |
839f2864 EB |
3197 | = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition, |
3198 | debug_info_p); | |
a1ab4c31 AC |
3199 | |
3200 | /* Make an expression using a PLACEHOLDER_EXPR from the | |
3201 | FIELD_DECL node just created and link that with the | |
8cd28148 | 3202 | corresponding GNAT defining identifier. */ |
a1ab4c31 AC |
3203 | save_gnu_tree (gnat_field, |
3204 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
8cd28148 | 3205 | build0 (PLACEHOLDER_EXPR, gnu_type), |
a1ab4c31 AC |
3206 | gnu_field, NULL_TREE), |
3207 | true); | |
3208 | ||
8cd28148 | 3209 | if (!is_unchecked_union) |
a1ab4c31 | 3210 | { |
910ad8de | 3211 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 AC |
3212 | gnu_field_list = gnu_field; |
3213 | } | |
3214 | } | |
3215 | ||
908ba941 | 3216 | /* If we have a derived untagged type that renames discriminants in |
b1b2b511 EB |
3217 | the parent type, the (stored) discriminants are just a copy of the |
3218 | discriminants of the parent type. This means that any constraints | |
3219 | added by the renaming in the derivation are disregarded as far as | |
3220 | the layout of the derived type is concerned. To rescue them, we | |
3221 | change the type of the (stored) discriminants to a subtype with | |
3222 | the bounds of the type of the visible discriminants. */ | |
908ba941 EB |
3223 | if (has_discr |
3224 | && !is_extension | |
3225 | && Stored_Constraint (gnat_entity) != No_Elist) | |
3226 | for (gnat_constr = First_Elmt (Stored_Constraint (gnat_entity)); | |
3227 | gnat_constr != No_Elmt; | |
3228 | gnat_constr = Next_Elmt (gnat_constr)) | |
3229 | if (Nkind (Node (gnat_constr)) == N_Identifier | |
3230 | /* Ignore access discriminants. */ | |
3231 | && !Is_Access_Type (Etype (Node (gnat_constr))) | |
3232 | && Ekind (Entity (Node (gnat_constr))) == E_Discriminant) | |
3233 | { | |
3234 | Entity_Id gnat_discr = Entity (Node (gnat_constr)); | |
05dbb83f AC |
3235 | tree gnu_discr_type = gnat_to_gnu_type (Etype (gnat_discr)); |
3236 | tree gnu_ref | |
908ba941 | 3237 | = gnat_to_gnu_entity (Original_Record_Component (gnat_discr), |
afc737f0 | 3238 | NULL_TREE, false); |
908ba941 EB |
3239 | |
3240 | /* GNU_REF must be an expression using a PLACEHOLDER_EXPR built | |
3241 | just above for one of the stored discriminants. */ | |
3242 | gcc_assert (TREE_TYPE (TREE_OPERAND (gnu_ref, 0)) == gnu_type); | |
3243 | ||
3244 | if (gnu_discr_type != TREE_TYPE (gnu_ref)) | |
3245 | { | |
3246 | const unsigned prec = TYPE_PRECISION (TREE_TYPE (gnu_ref)); | |
3247 | tree gnu_subtype | |
3248 | = TYPE_UNSIGNED (TREE_TYPE (gnu_ref)) | |
3249 | ? make_unsigned_type (prec) : make_signed_type (prec); | |
3250 | TREE_TYPE (gnu_subtype) = TREE_TYPE (gnu_ref); | |
3251 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; | |
3252 | SET_TYPE_RM_MIN_VALUE (gnu_subtype, | |
3253 | TYPE_MIN_VALUE (gnu_discr_type)); | |
3254 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, | |
3255 | TYPE_MAX_VALUE (gnu_discr_type)); | |
3256 | TREE_TYPE (gnu_ref) | |
3257 | = TREE_TYPE (TREE_OPERAND (gnu_ref, 1)) = gnu_subtype; | |
3258 | } | |
3259 | } | |
3260 | ||
05dbb83f | 3261 | /* If this is a derived type with discriminants and these discriminants |
87eddedc | 3262 | affect the initial shape it has inherited, factor them in. */ |
05dbb83f AC |
3263 | if (has_discr |
3264 | && !is_extension | |
3265 | && !Has_Record_Rep_Clause (gnat_entity) | |
3266 | && Stored_Constraint (gnat_entity) != No_Elist | |
3267 | && (gnat_parent_type = Underlying_Type (Etype (gnat_entity))) | |
3268 | && Is_Record_Type (gnat_parent_type) | |
87eddedc EB |
3269 | && Is_Unchecked_Union (gnat_entity) |
3270 | == Is_Unchecked_Union (gnat_parent_type) | |
8489c295 | 3271 | && No_Reordering (gnat_entity) == No_Reordering (gnat_parent_type)) |
05dbb83f AC |
3272 | { |
3273 | tree gnu_parent_type | |
3274 | = TYPE_MAIN_VARIANT (gnat_to_gnu_type (gnat_parent_type)); | |
3275 | ||
3276 | if (TYPE_IS_PADDING_P (gnu_parent_type)) | |
3277 | gnu_parent_type = TREE_TYPE (TYPE_FIELDS (gnu_parent_type)); | |
3278 | ||
3279 | vec<subst_pair> gnu_subst_list | |
3280 | = build_subst_list (gnat_entity, gnat_parent_type, definition); | |
3281 | ||
3282 | /* Set the layout of the type to match that of the parent type, | |
95b7c2e0 PMR |
3283 | doing required substitutions. If we are in minimal GNAT |
3284 | encodings mode, we don't need debug info for the inner record | |
3285 | types, as they will be part of the embedding variant record's | |
3286 | debug info. */ | |
3287 | copy_and_substitute_in_layout | |
3288 | (gnat_entity, gnat_parent_type, gnu_type, gnu_parent_type, | |
3289 | gnu_subst_list, | |
3290 | debug_info_p && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL); | |
05dbb83f AC |
3291 | } |
3292 | else | |
3293 | { | |
3294 | /* Add the fields into the record type and finish it up. */ | |
3295 | components_to_record (Component_List (record_definition), | |
3296 | gnat_entity, gnu_field_list, gnu_type, | |
3297 | packed, definition, false, all_rep, | |
3298 | is_unchecked_union, artificial_p, | |
3299 | debug_info_p, false, | |
3300 | all_rep ? NULL_TREE : bitsize_zero_node, | |
3301 | NULL); | |
3302 | ||
3303 | /* If there are entities in the chain corresponding to components | |
3304 | that we did not elaborate, ensure we elaborate their types if | |
3305 | they are Itypes. */ | |
3306 | for (gnat_temp = First_Entity (gnat_entity); | |
3307 | Present (gnat_temp); | |
3308 | gnat_temp = Next_Entity (gnat_temp)) | |
3309 | if ((Ekind (gnat_temp) == E_Component | |
3310 | || Ekind (gnat_temp) == E_Discriminant) | |
3311 | && Is_Itype (Etype (gnat_temp)) | |
3312 | && !present_gnu_tree (gnat_temp)) | |
3313 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, false); | |
3314 | } | |
a1ab4c31 | 3315 | |
a1ab4c31 AC |
3316 | /* Fill in locations of fields. */ |
3317 | annotate_rep (gnat_entity, gnu_type); | |
3318 | ||
871fda0a EB |
3319 | /* If this is a record type associated with an exception definition, |
3320 | equate its fields to those of the standard exception type. This | |
3321 | will make it possible to convert between them. */ | |
3322 | if (gnu_entity_name == exception_data_name_id) | |
3323 | { | |
3324 | tree gnu_std_field; | |
3325 | for (gnu_field = TYPE_FIELDS (gnu_type), | |
3326 | gnu_std_field = TYPE_FIELDS (except_type_node); | |
3327 | gnu_field; | |
910ad8de NF |
3328 | gnu_field = DECL_CHAIN (gnu_field), |
3329 | gnu_std_field = DECL_CHAIN (gnu_std_field)) | |
871fda0a EB |
3330 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (gnu_field, gnu_std_field); |
3331 | gcc_assert (!gnu_std_field); | |
3332 | } | |
a1ab4c31 AC |
3333 | } |
3334 | break; | |
3335 | ||
3336 | case E_Class_Wide_Subtype: | |
3337 | /* If an equivalent type is present, that is what we should use. | |
3338 | Otherwise, fall through to handle this like a record subtype | |
3339 | since it may have constraints. */ | |
3340 | if (gnat_equiv_type != gnat_entity) | |
3341 | { | |
afc737f0 | 3342 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, false); |
a1ab4c31 AC |
3343 | maybe_present = true; |
3344 | break; | |
3345 | } | |
3346 | ||
9c453de7 | 3347 | /* ... fall through ... */ |
a1ab4c31 AC |
3348 | |
3349 | case E_Record_Subtype: | |
a1ab4c31 AC |
3350 | /* If Cloned_Subtype is Present it means this record subtype has |
3351 | identical layout to that type or subtype and we should use | |
3352 | that GCC type for this one. The front end guarantees that | |
3353 | the component list is shared. */ | |
3354 | if (Present (Cloned_Subtype (gnat_entity))) | |
3355 | { | |
3356 | gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity), | |
afc737f0 | 3357 | NULL_TREE, false); |
d3b080bc | 3358 | saved = true; |
8cd28148 | 3359 | break; |
a1ab4c31 AC |
3360 | } |
3361 | ||
3362 | /* Otherwise, first ensure the base type is elaborated. Then, if we are | |
8cd28148 EB |
3363 | changing the type, make a new type with each field having the type of |
3364 | the field in the new subtype but the position computed by transforming | |
3365 | every discriminant reference according to the constraints. We don't | |
3366 | see any difference between private and non-private type here since | |
3367 | derivations from types should have been deferred until the completion | |
3368 | of the private type. */ | |
a1ab4c31 AC |
3369 | else |
3370 | { | |
3371 | Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity); | |
a1ab4c31 AC |
3372 | |
3373 | if (!definition) | |
8cd28148 EB |
3374 | { |
3375 | defer_incomplete_level++; | |
3376 | this_deferred = true; | |
3377 | } | |
a1ab4c31 | 3378 | |
05dbb83f | 3379 | tree gnu_base_type |
f797c2b7 | 3380 | = TYPE_MAIN_VARIANT (gnat_to_gnu_type (gnat_base_type)); |
a1ab4c31 | 3381 | |
a1ab4c31 AC |
3382 | if (present_gnu_tree (gnat_entity)) |
3383 | { | |
3384 | maybe_present = true; | |
3385 | break; | |
3386 | } | |
3387 | ||
901ad63f EB |
3388 | /* If this is a record subtype associated with a dispatch table, |
3389 | strip the suffix. This is necessary to make sure 2 different | |
3390 | subtypes associated with the imported and exported views of a | |
3391 | dispatch table are properly merged in LTO mode. */ | |
3392 | if (Is_Dispatch_Table_Entity (gnat_entity)) | |
3393 | { | |
3394 | char *p; | |
3395 | Get_Encoded_Name (gnat_entity); | |
c679a915 | 3396 | p = strchr (Name_Buffer, '_'); |
901ad63f | 3397 | gcc_assert (p); |
c679a915 | 3398 | strcpy (p+2, "dtS"); |
901ad63f EB |
3399 | gnu_entity_name = get_identifier (Name_Buffer); |
3400 | } | |
3401 | ||
8cd28148 | 3402 | /* When the subtype has discriminants and these discriminants affect |
95c1c4bb | 3403 | the initial shape it has inherited, factor them in. But for an |
05dbb83f AC |
3404 | Unchecked_Union (it must be an Itype), just return the type. */ |
3405 | if (Has_Discriminants (gnat_entity) | |
3406 | && Stored_Constraint (gnat_entity) != No_Elist | |
8cd28148 | 3407 | && !Is_For_Access_Subtype (gnat_entity) |
05dbb83f AC |
3408 | && Is_Record_Type (gnat_base_type) |
3409 | && !Is_Unchecked_Union (gnat_base_type)) | |
a1ab4c31 | 3410 | { |
9771b263 | 3411 | vec<subst_pair> gnu_subst_list |
8cd28148 | 3412 | = build_subst_list (gnat_entity, gnat_base_type, definition); |
05dbb83f | 3413 | tree gnu_unpad_base_type; |
a1ab4c31 AC |
3414 | |
3415 | gnu_type = make_node (RECORD_TYPE); | |
0fb2335d | 3416 | TYPE_NAME (gnu_type) = gnu_entity_name; |
eb59e428 | 3417 | if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
95b7c2e0 PMR |
3418 | { |
3419 | /* Use the ultimate base record type as the debug type. | |
3420 | Subtypes and derived types bring no useful | |
3421 | information. */ | |
3422 | Entity_Id gnat_debug_type = gnat_entity; | |
3423 | while (Etype (gnat_debug_type) != gnat_debug_type) | |
3424 | gnat_debug_type = Etype (gnat_debug_type); | |
3425 | tree gnu_debug_type | |
3426 | = TYPE_MAIN_VARIANT (gnat_to_gnu_type (gnat_debug_type)); | |
3427 | SET_TYPE_DEBUG_TYPE (gnu_type, gnu_debug_type); | |
3428 | } | |
92eee8f8 | 3429 | TYPE_PACKED (gnu_type) = TYPE_PACKED (gnu_base_type); |
ee45a32d EB |
3430 | TYPE_REVERSE_STORAGE_ORDER (gnu_type) |
3431 | = Reverse_Storage_Order (gnat_entity); | |
74746d49 | 3432 | process_attributes (&gnu_type, &attr_list, true, gnat_entity); |
a1ab4c31 | 3433 | |
05dbb83f AC |
3434 | /* Set the size, alignment and alias set of the type to match |
3435 | those of the base type, doing required substitutions. */ | |
95c1c4bb EB |
3436 | copy_and_substitute_in_size (gnu_type, gnu_base_type, |
3437 | gnu_subst_list); | |
c244bf8f | 3438 | |
315cff15 | 3439 | if (TYPE_IS_PADDING_P (gnu_base_type)) |
c244bf8f EB |
3440 | gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type)); |
3441 | else | |
3442 | gnu_unpad_base_type = gnu_base_type; | |
3443 | ||
05dbb83f AC |
3444 | /* Set the layout of the type to match that of the base type, |
3445 | doing required substitutions. We will output debug info | |
3446 | manually below so pass false as last argument. */ | |
3447 | copy_and_substitute_in_layout (gnat_entity, gnat_base_type, | |
3448 | gnu_type, gnu_unpad_base_type, | |
3449 | gnu_subst_list, false); | |
a1ab4c31 | 3450 | |
a1ab4c31 AC |
3451 | /* Fill in locations of fields. */ |
3452 | annotate_rep (gnat_entity, gnu_type); | |
3453 | ||
986ccd21 PMR |
3454 | /* If debugging information is being written for the type and if |
3455 | we are asked to output such encodings, write a record that | |
3456 | shows what we are a subtype of and also make a variable that | |
3457 | indicates our size, if still variable. */ | |
3458 | if (gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) | |
a1ab4c31 AC |
3459 | { |
3460 | tree gnu_subtype_marker = make_node (RECORD_TYPE); | |
9dba4b55 PC |
3461 | tree gnu_unpad_base_name |
3462 | = TYPE_IDENTIFIER (gnu_unpad_base_type); | |
e9cfc9b5 | 3463 | tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type); |
a1ab4c31 | 3464 | |
a1ab4c31 AC |
3465 | TYPE_NAME (gnu_subtype_marker) |
3466 | = create_concat_name (gnat_entity, "XVS"); | |
3467 | finish_record_type (gnu_subtype_marker, | |
c244bf8f EB |
3468 | create_field_decl (gnu_unpad_base_name, |
3469 | build_reference_type | |
3470 | (gnu_unpad_base_type), | |
a1ab4c31 | 3471 | gnu_subtype_marker, |
da01bfee EB |
3472 | NULL_TREE, NULL_TREE, |
3473 | 0, 0), | |
032d1b71 | 3474 | 0, true); |
a1ab4c31 | 3475 | |
a5695aa2 | 3476 | add_parallel_type (gnu_type, gnu_subtype_marker); |
e9cfc9b5 EB |
3477 | |
3478 | if (definition | |
3479 | && TREE_CODE (gnu_size_unit) != INTEGER_CST | |
3480 | && !CONTAINS_PLACEHOLDER_P (gnu_size_unit)) | |
b5bba4a6 EB |
3481 | TYPE_SIZE_UNIT (gnu_subtype_marker) |
3482 | = create_var_decl (create_concat_name (gnat_entity, | |
3483 | "XVZ"), | |
3484 | NULL_TREE, sizetype, gnu_size_unit, | |
2056c5ed EB |
3485 | false, false, false, false, false, |
3486 | true, debug_info_p, | |
3487 | NULL, gnat_entity); | |
a1ab4c31 | 3488 | } |
a1ab4c31 AC |
3489 | } |
3490 | ||
8cd28148 EB |
3491 | /* Otherwise, go down all the components in the new type and make |
3492 | them equivalent to those in the base type. */ | |
a1ab4c31 | 3493 | else |
8cd28148 | 3494 | { |
c244bf8f | 3495 | gnu_type = gnu_base_type; |
8cd28148 EB |
3496 | |
3497 | for (gnat_temp = First_Entity (gnat_entity); | |
3498 | Present (gnat_temp); | |
3499 | gnat_temp = Next_Entity (gnat_temp)) | |
3500 | if ((Ekind (gnat_temp) == E_Discriminant | |
3501 | && !Is_Unchecked_Union (gnat_base_type)) | |
3502 | || Ekind (gnat_temp) == E_Component) | |
3503 | save_gnu_tree (gnat_temp, | |
3504 | gnat_to_gnu_field_decl | |
3505 | (Original_Record_Component (gnat_temp)), | |
3506 | false); | |
3507 | } | |
a1ab4c31 AC |
3508 | } |
3509 | break; | |
3510 | ||
3511 | case E_Access_Subprogram_Type: | |
1e55d29a | 3512 | case E_Anonymous_Access_Subprogram_Type: |
a1ab4c31 AC |
3513 | /* Use the special descriptor type for dispatch tables if needed, |
3514 | that is to say for the Prim_Ptr of a-tags.ads and its clones. | |
3515 | Note that we are only required to do so for static tables in | |
3516 | order to be compatible with the C++ ABI, but Ada 2005 allows | |
3517 | to extend library level tagged types at the local level so | |
3518 | we do it in the non-static case as well. */ | |
3519 | if (TARGET_VTABLE_USES_DESCRIPTORS | |
3520 | && Is_Dispatch_Table_Entity (gnat_entity)) | |
3521 | { | |
3522 | gnu_type = fdesc_type_node; | |
3523 | gnu_size = TYPE_SIZE (gnu_type); | |
3524 | break; | |
3525 | } | |
3526 | ||
9c453de7 | 3527 | /* ... fall through ... */ |
a1ab4c31 | 3528 | |
a1ab4c31 AC |
3529 | case E_Allocator_Type: |
3530 | case E_Access_Type: | |
3531 | case E_Access_Attribute_Type: | |
3532 | case E_Anonymous_Access_Type: | |
3533 | case E_General_Access_Type: | |
3534 | { | |
d0c26312 | 3535 | /* The designated type and its equivalent type for gigi. */ |
a1ab4c31 AC |
3536 | Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity); |
3537 | Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type); | |
d0c26312 | 3538 | /* Whether it comes from a limited with. */ |
1e55d29a | 3539 | const bool is_from_limited_with |
7ed9919d | 3540 | = (Is_Incomplete_Type (gnat_desig_equiv) |
7b56a91b | 3541 | && From_Limited_With (gnat_desig_equiv)); |
d3271136 EB |
3542 | /* Whether it is a completed Taft Amendment type. Such a type is to |
3543 | be treated as coming from a limited with clause if it is not in | |
3544 | the main unit, i.e. we break potential circularities here in case | |
3545 | the body of an external unit is loaded for inter-unit inlining. */ | |
3546 | const bool is_completed_taft_type | |
7ed9919d | 3547 | = (Is_Incomplete_Type (gnat_desig_equiv) |
d3271136 EB |
3548 | && Has_Completion_In_Body (gnat_desig_equiv) |
3549 | && Present (Full_View (gnat_desig_equiv))); | |
d0c26312 | 3550 | /* The "full view" of the designated type. If this is an incomplete |
a1ab4c31 AC |
3551 | entity from a limited with, treat its non-limited view as the full |
3552 | view. Otherwise, if this is an incomplete or private type, use the | |
3553 | full view. In the former case, we might point to a private type, | |
3554 | in which case, we need its full view. Also, we want to look at the | |
3555 | actual type used for the representation, so this takes a total of | |
3556 | three steps. */ | |
3557 | Entity_Id gnat_desig_full_direct_first | |
d0c26312 EB |
3558 | = (is_from_limited_with |
3559 | ? Non_Limited_View (gnat_desig_equiv) | |
7ed9919d | 3560 | : (Is_Incomplete_Or_Private_Type (gnat_desig_equiv) |
a1ab4c31 AC |
3561 | ? Full_View (gnat_desig_equiv) : Empty)); |
3562 | Entity_Id gnat_desig_full_direct | |
3563 | = ((is_from_limited_with | |
3564 | && Present (gnat_desig_full_direct_first) | |
7ed9919d | 3565 | && Is_Private_Type (gnat_desig_full_direct_first)) |
a1ab4c31 AC |
3566 | ? Full_View (gnat_desig_full_direct_first) |
3567 | : gnat_desig_full_direct_first); | |
3568 | Entity_Id gnat_desig_full | |
3569 | = Gigi_Equivalent_Type (gnat_desig_full_direct); | |
d0c26312 EB |
3570 | /* The type actually used to represent the designated type, either |
3571 | gnat_desig_full or gnat_desig_equiv. */ | |
a1ab4c31 | 3572 | Entity_Id gnat_desig_rep; |
a1ab4c31 AC |
3573 | /* We want to know if we'll be seeing the freeze node for any |
3574 | incomplete type we may be pointing to. */ | |
1e55d29a | 3575 | const bool in_main_unit |
a1ab4c31 AC |
3576 | = (Present (gnat_desig_full) |
3577 | ? In_Extended_Main_Code_Unit (gnat_desig_full) | |
3578 | : In_Extended_Main_Code_Unit (gnat_desig_type)); | |
1e17ef87 | 3579 | /* True if we make a dummy type here. */ |
a1ab4c31 | 3580 | bool made_dummy = false; |
d0c26312 | 3581 | /* The mode to be used for the pointer type. */ |
fffbab82 | 3582 | scalar_int_mode p_mode; |
d0c26312 EB |
3583 | /* The GCC type used for the designated type. */ |
3584 | tree gnu_desig_type = NULL_TREE; | |
a1ab4c31 | 3585 | |
fffbab82 RS |
3586 | if (!int_mode_for_size (esize, 0).exists (&p_mode) |
3587 | || !targetm.valid_pointer_mode (p_mode)) | |
a1ab4c31 AC |
3588 | p_mode = ptr_mode; |
3589 | ||
3590 | /* If either the designated type or its full view is an unconstrained | |
3591 | array subtype, replace it with the type it's a subtype of. This | |
3592 | avoids problems with multiple copies of unconstrained array types. | |
3593 | Likewise, if the designated type is a subtype of an incomplete | |
3594 | record type, use the parent type to avoid order of elaboration | |
3595 | issues. This can lose some code efficiency, but there is no | |
3596 | alternative. */ | |
3597 | if (Ekind (gnat_desig_equiv) == E_Array_Subtype | |
d0c26312 | 3598 | && !Is_Constrained (gnat_desig_equiv)) |
a1ab4c31 AC |
3599 | gnat_desig_equiv = Etype (gnat_desig_equiv); |
3600 | if (Present (gnat_desig_full) | |
3601 | && ((Ekind (gnat_desig_full) == E_Array_Subtype | |
d0c26312 | 3602 | && !Is_Constrained (gnat_desig_full)) |
a1ab4c31 AC |
3603 | || (Ekind (gnat_desig_full) == E_Record_Subtype |
3604 | && Ekind (Etype (gnat_desig_full)) == E_Record_Type))) | |
3605 | gnat_desig_full = Etype (gnat_desig_full); | |
3606 | ||
8ea456b9 | 3607 | /* Set the type that's the representation of the designated type. */ |
d0c26312 EB |
3608 | gnat_desig_rep |
3609 | = Present (gnat_desig_full) ? gnat_desig_full : gnat_desig_equiv; | |
a1ab4c31 AC |
3610 | |
3611 | /* If we already know what the full type is, use it. */ | |
8ea456b9 | 3612 | if (Present (gnat_desig_full) && present_gnu_tree (gnat_desig_full)) |
a1ab4c31 AC |
3613 | gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full)); |
3614 | ||
d0c26312 EB |
3615 | /* Get the type of the thing we are to point to and build a pointer to |
3616 | it. If it is a reference to an incomplete or private type with a | |
d3271136 EB |
3617 | full view that is a record, an array or an access, make a dummy type |
3618 | and get the actual type later when we have verified it is safe. */ | |
d0c26312 EB |
3619 | else if ((!in_main_unit |
3620 | && !present_gnu_tree (gnat_desig_equiv) | |
a1ab4c31 | 3621 | && Present (gnat_desig_full) |
8ea456b9 | 3622 | && (Is_Record_Type (gnat_desig_full) |
d3271136 EB |
3623 | || Is_Array_Type (gnat_desig_full) |
3624 | || Is_Access_Type (gnat_desig_full))) | |
1e55d29a EB |
3625 | /* Likewise if this is a reference to a record, an array or a |
3626 | subprogram type and we are to defer elaborating incomplete | |
3627 | types. We do this because this access type may be the full | |
3628 | view of a private type. */ | |
d0c26312 | 3629 | || ((!in_main_unit || imported_p) |
a10623fb | 3630 | && defer_incomplete_level != 0 |
d0c26312 EB |
3631 | && !present_gnu_tree (gnat_desig_equiv) |
3632 | && (Is_Record_Type (gnat_desig_rep) | |
1e55d29a EB |
3633 | || Is_Array_Type (gnat_desig_rep) |
3634 | || Ekind (gnat_desig_rep) == E_Subprogram_Type)) | |
a1ab4c31 | 3635 | /* If this is a reference from a limited_with type back to our |
d0c26312 | 3636 | main unit and there's a freeze node for it, either we have |
a1ab4c31 AC |
3637 | already processed the declaration and made the dummy type, |
3638 | in which case we just reuse the latter, or we have not yet, | |
3639 | in which case we make the dummy type and it will be reused | |
d0c26312 EB |
3640 | when the declaration is finally processed. In both cases, |
3641 | the pointer eventually created below will be automatically | |
8ea456b9 EB |
3642 | adjusted when the freeze node is processed. */ |
3643 | || (in_main_unit | |
3644 | && is_from_limited_with | |
3645 | && Present (Freeze_Node (gnat_desig_rep)))) | |
a1ab4c31 AC |
3646 | { |
3647 | gnu_desig_type = make_dummy_type (gnat_desig_equiv); | |
3648 | made_dummy = true; | |
3649 | } | |
3650 | ||
3651 | /* Otherwise handle the case of a pointer to itself. */ | |
3652 | else if (gnat_desig_equiv == gnat_entity) | |
3653 | { | |
3654 | gnu_type | |
3655 | = build_pointer_type_for_mode (void_type_node, p_mode, | |
3656 | No_Strict_Aliasing (gnat_entity)); | |
3657 | TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type; | |
3658 | } | |
3659 | ||
d0c26312 | 3660 | /* If expansion is disabled, the equivalent type of a concurrent type |
8234d02a | 3661 | is absent, so we use the void pointer type. */ |
a1ab4c31 | 3662 | else if (type_annotate_only && No (gnat_desig_equiv)) |
1366ba41 | 3663 | gnu_type = ptr_type_node; |
a1ab4c31 | 3664 | |
8234d02a EB |
3665 | /* If the ultimately designated type is an incomplete type with no full |
3666 | view, we use the void pointer type in LTO mode to avoid emitting a | |
3667 | dummy type in the GIMPLE IR. We cannot do that in regular mode as | |
3668 | the name of the dummy type in used by GDB for a global lookup. */ | |
3669 | else if (Ekind (gnat_desig_rep) == E_Incomplete_Type | |
3670 | && No (Full_View (gnat_desig_rep)) | |
3671 | && flag_generate_lto) | |
3672 | gnu_type = ptr_type_node; | |
3673 | ||
d0c26312 EB |
3674 | /* Finally, handle the default case where we can just elaborate our |
3675 | designated type. */ | |
a1ab4c31 AC |
3676 | else |
3677 | gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv); | |
3678 | ||
3679 | /* It is possible that a call to gnat_to_gnu_type above resolved our | |
3680 | type. If so, just return it. */ | |
3681 | if (present_gnu_tree (gnat_entity)) | |
3682 | { | |
3683 | maybe_present = true; | |
3684 | break; | |
3685 | } | |
3686 | ||
1e55d29a | 3687 | /* Access-to-unconstrained-array types need a special treatment. */ |
8ea456b9 EB |
3688 | if (Is_Array_Type (gnat_desig_rep) && !Is_Constrained (gnat_desig_rep)) |
3689 | { | |
3690 | /* If the processing above got something that has a pointer, then | |
3691 | we are done. This could have happened either because the type | |
3692 | was elaborated or because somebody else executed the code. */ | |
3693 | if (!TYPE_POINTER_TO (gnu_desig_type)) | |
3694 | build_dummy_unc_pointer_types (gnat_desig_equiv, gnu_desig_type); | |
1e55d29a | 3695 | |
8ea456b9 EB |
3696 | gnu_type = TYPE_POINTER_TO (gnu_desig_type); |
3697 | } | |
3698 | ||
1228a6a6 | 3699 | /* If we haven't done it yet, build the pointer type the usual way. */ |
8ea456b9 | 3700 | else if (!gnu_type) |
a1ab4c31 | 3701 | { |
d0c26312 | 3702 | /* Modify the designated type if we are pointing only to constant |
1e55d29a | 3703 | objects, but don't do it for a dummy type. */ |
a1ab4c31 | 3704 | if (Is_Access_Constant (gnat_entity) |
1e55d29a EB |
3705 | && !TYPE_IS_DUMMY_P (gnu_desig_type)) |
3706 | gnu_desig_type | |
3707 | = change_qualified_type (gnu_desig_type, TYPE_QUAL_CONST); | |
a1ab4c31 AC |
3708 | |
3709 | gnu_type | |
3710 | = build_pointer_type_for_mode (gnu_desig_type, p_mode, | |
3711 | No_Strict_Aliasing (gnat_entity)); | |
3712 | } | |
3713 | ||
1e55d29a EB |
3714 | /* If the designated type is not declared in the main unit and we made |
3715 | a dummy node for it, save our definition, elaborate the actual type | |
3716 | and replace the dummy type we made with the actual one. But if we | |
3717 | are to defer actually looking up the actual type, make an entry in | |
3718 | the deferred list instead. If this is from a limited with, we may | |
3719 | have to defer until the end of the current unit. */ | |
3720 | if (!in_main_unit && made_dummy) | |
a1ab4c31 | 3721 | { |
1e55d29a EB |
3722 | if (TYPE_IS_FAT_POINTER_P (gnu_type) && esize == POINTER_SIZE) |
3723 | gnu_type | |
3724 | = build_pointer_type (TYPE_OBJECT_RECORD_TYPE (gnu_desig_type)); | |
a1ab4c31 | 3725 | |
74746d49 EB |
3726 | process_attributes (&gnu_type, &attr_list, false, gnat_entity); |
3727 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, | |
c1a569ef EB |
3728 | artificial_p, debug_info_p, |
3729 | gnat_entity); | |
a1ab4c31 AC |
3730 | this_made_decl = true; |
3731 | gnu_type = TREE_TYPE (gnu_decl); | |
3732 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
3733 | saved = true; | |
3734 | ||
d3271136 EB |
3735 | if (defer_incomplete_level == 0 |
3736 | && !is_from_limited_with | |
3737 | && !is_completed_taft_type) | |
80ec8b4c | 3738 | { |
1e55d29a | 3739 | update_pointer_to (TYPE_MAIN_VARIANT (gnu_desig_type), |
80ec8b4c | 3740 | gnat_to_gnu_type (gnat_desig_equiv)); |
80ec8b4c | 3741 | } |
a1ab4c31 AC |
3742 | else |
3743 | { | |
d0c26312 | 3744 | struct incomplete *p = XNEW (struct incomplete); |
a1ab4c31 | 3745 | struct incomplete **head |
d3271136 | 3746 | = (is_from_limited_with || is_completed_taft_type |
1e55d29a EB |
3747 | ? &defer_limited_with_list : &defer_incomplete_list); |
3748 | ||
3749 | p->old_type = gnu_desig_type; | |
a1ab4c31 AC |
3750 | p->full_type = gnat_desig_equiv; |
3751 | p->next = *head; | |
3752 | *head = p; | |
3753 | } | |
3754 | } | |
3755 | } | |
3756 | break; | |
3757 | ||
3758 | case E_Access_Protected_Subprogram_Type: | |
3759 | case E_Anonymous_Access_Protected_Subprogram_Type: | |
42a5e410 | 3760 | /* If we are just annotating types and have no equivalent record type, |
8234d02a | 3761 | just use the void pointer type. */ |
42a5e410 | 3762 | if (type_annotate_only && gnat_equiv_type == gnat_entity) |
1366ba41 | 3763 | gnu_type = ptr_type_node; |
42a5e410 EB |
3764 | |
3765 | /* The run-time representation is the equivalent type. */ | |
a1ab4c31 AC |
3766 | else |
3767 | { | |
a1ab4c31 | 3768 | gnu_type = gnat_to_gnu_type (gnat_equiv_type); |
2ddc34ba | 3769 | maybe_present = true; |
a1ab4c31 AC |
3770 | } |
3771 | ||
1e55d29a EB |
3772 | /* The designated subtype must be elaborated as well, if it does |
3773 | not have its own freeze node. */ | |
a1ab4c31 AC |
3774 | if (Is_Itype (Directly_Designated_Type (gnat_entity)) |
3775 | && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) | |
3776 | && No (Freeze_Node (Directly_Designated_Type (gnat_entity))) | |
3777 | && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity)))) | |
3778 | gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), | |
afc737f0 | 3779 | NULL_TREE, false); |
a1ab4c31 AC |
3780 | |
3781 | break; | |
3782 | ||
3783 | case E_Access_Subtype: | |
a1ab4c31 | 3784 | /* We treat this as identical to its base type; any constraint is |
1e55d29a | 3785 | meaningful only to the front-end. */ |
fbb1c7d4 EB |
3786 | gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity), NULL_TREE, false); |
3787 | saved = true; | |
a1ab4c31 | 3788 | |
1e55d29a EB |
3789 | /* The designated subtype must be elaborated as well, if it does |
3790 | not have its own freeze node. But designated subtypes created | |
a1ab4c31 | 3791 | for constrained components of records with discriminants are |
1e55d29a EB |
3792 | not frozen by the front-end and not elaborated here, because |
3793 | their use may appear before the base type is frozen and it is | |
3794 | not clear that they are needed in gigi. With the current model, | |
3795 | there is no correct place where they could be elaborated. */ | |
a1ab4c31 AC |
3796 | if (Is_Itype (Directly_Designated_Type (gnat_entity)) |
3797 | && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) | |
3798 | && Is_Frozen (Directly_Designated_Type (gnat_entity)) | |
3799 | && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))) | |
3800 | { | |
1e55d29a EB |
3801 | /* If we are to defer elaborating incomplete types, make a dummy |
3802 | type node and elaborate it later. */ | |
3803 | if (defer_incomplete_level != 0) | |
a1ab4c31 | 3804 | { |
dee12fcd | 3805 | struct incomplete *p = XNEW (struct incomplete); |
a1ab4c31 | 3806 | |
dee12fcd EB |
3807 | p->old_type |
3808 | = make_dummy_type (Directly_Designated_Type (gnat_entity)); | |
a1ab4c31 AC |
3809 | p->full_type = Directly_Designated_Type (gnat_entity); |
3810 | p->next = defer_incomplete_list; | |
3811 | defer_incomplete_list = p; | |
3812 | } | |
7ed9919d EB |
3813 | else if (!Is_Incomplete_Or_Private_Type |
3814 | (Base_Type (Directly_Designated_Type (gnat_entity)))) | |
a1ab4c31 | 3815 | gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), |
afc737f0 | 3816 | NULL_TREE, false); |
a1ab4c31 | 3817 | } |
a1ab4c31 AC |
3818 | break; |
3819 | ||
3820 | /* Subprogram Entities | |
3821 | ||
c9d84d0e | 3822 | The following access functions are defined for subprograms: |
a1ab4c31 | 3823 | |
c9d84d0e | 3824 | Etype Return type or Standard_Void_Type. |
a1ab4c31 AC |
3825 | First_Formal The first formal parameter. |
3826 | Is_Imported Indicates that the subprogram has appeared in | |
2ddc34ba | 3827 | an INTERFACE or IMPORT pragma. For now we |
a1ab4c31 AC |
3828 | assume that the external language is C. |
3829 | Is_Exported Likewise but for an EXPORT pragma. | |
3830 | Is_Inlined True if the subprogram is to be inlined. | |
3831 | ||
a1ab4c31 AC |
3832 | Each parameter is first checked by calling must_pass_by_ref on its |
3833 | type to determine if it is passed by reference. For parameters which | |
3834 | are copied in, if they are Ada In Out or Out parameters, their return | |
3835 | value becomes part of a record which becomes the return type of the | |
3836 | function (C function - note that this applies only to Ada procedures | |
2ddc34ba | 3837 | so there is no Ada return type). Additional code to store back the |
a1ab4c31 AC |
3838 | parameters will be generated on the caller side. This transformation |
3839 | is done here, not in the front-end. | |
3840 | ||
3841 | The intended result of the transformation can be seen from the | |
3842 | equivalent source rewritings that follow: | |
3843 | ||
3844 | struct temp {int a,b}; | |
3845 | procedure P (A,B: In Out ...) is temp P (int A,B) | |
3846 | begin { | |
3847 | .. .. | |
3848 | end P; return {A,B}; | |
3849 | } | |
3850 | ||
3851 | temp t; | |
3852 | P(X,Y); t = P(X,Y); | |
3853 | X = t.a , Y = t.b; | |
3854 | ||
3855 | For subprogram types we need to perform mainly the same conversions to | |
3856 | GCC form that are needed for procedures and function declarations. The | |
3857 | only difference is that at the end, we make a type declaration instead | |
3858 | of a function declaration. */ | |
3859 | ||
3860 | case E_Subprogram_Type: | |
3861 | case E_Function: | |
3862 | case E_Procedure: | |
3863 | { | |
7414a3c3 EB |
3864 | tree gnu_ext_name |
3865 | = gnu_ext_name_for_subprog (gnat_entity, gnu_entity_name); | |
0e24192c EB |
3866 | enum inline_status_t inline_status |
3867 | = Has_Pragma_No_Inline (gnat_entity) | |
3868 | ? is_suppressed | |
384e3fb1 JM |
3869 | : Has_Pragma_Inline_Always (gnat_entity) |
3870 | ? is_required | |
3871 | : (Is_Inlined (gnat_entity) ? is_enabled : is_disabled); | |
a1ab4c31 | 3872 | bool public_flag = Is_Public (gnat_entity) || imported_p; |
5865a63d AC |
3873 | /* Subprograms marked both Intrinsic and Always_Inline need not |
3874 | have a body of their own. */ | |
a1ab4c31 | 3875 | bool extern_flag |
5865a63d AC |
3876 | = ((Is_Public (gnat_entity) && !definition) |
3877 | || imported_p | |
3878 | || (Convention (gnat_entity) == Convention_Intrinsic | |
3879 | && Has_Pragma_Inline_Always (gnat_entity))); | |
1e55d29a | 3880 | tree gnu_param_list; |
a1ab4c31 | 3881 | |
8cd28148 EB |
3882 | /* A parameter may refer to this type, so defer completion of any |
3883 | incomplete types. */ | |
a1ab4c31 | 3884 | if (kind == E_Subprogram_Type && !definition) |
8cd28148 EB |
3885 | { |
3886 | defer_incomplete_level++; | |
3887 | this_deferred = true; | |
3888 | } | |
a1ab4c31 AC |
3889 | |
3890 | /* If the subprogram has an alias, it is probably inherited, so | |
3891 | we can use the original one. If the original "subprogram" | |
3892 | is actually an enumeration literal, it may be the first use | |
3893 | of its type, so we must elaborate that type now. */ | |
3894 | if (Present (Alias (gnat_entity))) | |
3895 | { | |
1d4b96e0 AC |
3896 | const Entity_Id gnat_renamed = Renamed_Object (gnat_entity); |
3897 | ||
a1ab4c31 | 3898 | if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal) |
afc737f0 EB |
3899 | gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, |
3900 | false); | |
a1ab4c31 | 3901 | |
afc737f0 EB |
3902 | gnu_decl |
3903 | = gnat_to_gnu_entity (Alias (gnat_entity), gnu_expr, false); | |
a1ab4c31 AC |
3904 | |
3905 | /* Elaborate any Itypes in the parameters of this entity. */ | |
3906 | for (gnat_temp = First_Formal_With_Extras (gnat_entity); | |
3907 | Present (gnat_temp); | |
3908 | gnat_temp = Next_Formal_With_Extras (gnat_temp)) | |
3909 | if (Is_Itype (Etype (gnat_temp))) | |
afc737f0 | 3910 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, false); |
a1ab4c31 | 3911 | |
1d4b96e0 AC |
3912 | /* Materialize renamed subprograms in the debugging information |
3913 | when the renamed object is compile time known. We can consider | |
3914 | such renamings as imported declarations. | |
3915 | ||
3916 | Because the parameters in generics instantiation are generally | |
3917 | materialized as renamings, we ofter end up having both the | |
3918 | renamed subprogram and the renaming in the same context and with | |
3919 | the same name: in this case, renaming is both useless debug-wise | |
3920 | and potentially harmful as name resolution in the debugger could | |
3921 | return twice the same entity! So avoid this case. */ | |
3922 | if (debug_info_p && !artificial_p | |
3923 | && !(get_debug_scope (gnat_entity, NULL) | |
3924 | == get_debug_scope (gnat_renamed, NULL) | |
3925 | && Name_Equals (Chars (gnat_entity), | |
3926 | Chars (gnat_renamed))) | |
3927 | && Present (gnat_renamed) | |
3928 | && (Ekind (gnat_renamed) == E_Function | |
3929 | || Ekind (gnat_renamed) == E_Procedure) | |
7c775aca | 3930 | && gnu_decl |
1d4b96e0 AC |
3931 | && TREE_CODE (gnu_decl) == FUNCTION_DECL) |
3932 | { | |
3933 | tree decl = build_decl (input_location, IMPORTED_DECL, | |
3934 | gnu_entity_name, void_type_node); | |
3935 | IMPORTED_DECL_ASSOCIATED_DECL (decl) = gnu_decl; | |
3936 | gnat_pushdecl (decl, gnat_entity); | |
3937 | } | |
3938 | ||
a1ab4c31 AC |
3939 | break; |
3940 | } | |
3941 | ||
1e55d29a EB |
3942 | /* Get the GCC tree for the (underlying) subprogram type. If the |
3943 | entity is an actual subprogram, also get the parameter list. */ | |
3944 | gnu_type | |
3945 | = gnat_to_gnu_subprog_type (gnat_entity, definition, debug_info_p, | |
3946 | &gnu_param_list); | |
7414a3c3 | 3947 | if (DECL_P (gnu_type)) |
1515785d | 3948 | { |
7414a3c3 EB |
3949 | gnu_decl = gnu_type; |
3950 | gnu_type = TREE_TYPE (gnu_decl); | |
3951 | break; | |
a1ab4c31 AC |
3952 | } |
3953 | ||
0567ae8d | 3954 | /* Deal with platform-specific calling conventions. */ |
a1ab4c31 | 3955 | if (Has_Stdcall_Convention (gnat_entity)) |
0567ae8d | 3956 | prepend_one_attribute |
a1ab4c31 AC |
3957 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, |
3958 | get_identifier ("stdcall"), NULL_TREE, | |
3959 | gnat_entity); | |
28dd0055 | 3960 | else if (Has_Thiscall_Convention (gnat_entity)) |
0567ae8d | 3961 | prepend_one_attribute |
28dd0055 EB |
3962 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, |
3963 | get_identifier ("thiscall"), NULL_TREE, | |
3964 | gnat_entity); | |
a1ab4c31 | 3965 | |
66194a98 | 3966 | /* If we should request stack realignment for a foreign convention |
0567ae8d AC |
3967 | subprogram, do so. Note that this applies to task entry points |
3968 | in particular. */ | |
66194a98 | 3969 | if (FOREIGN_FORCE_REALIGN_STACK |
a1ab4c31 | 3970 | && Has_Foreign_Convention (gnat_entity)) |
0567ae8d | 3971 | prepend_one_attribute |
a1ab4c31 AC |
3972 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, |
3973 | get_identifier ("force_align_arg_pointer"), NULL_TREE, | |
3974 | gnat_entity); | |
3975 | ||
0567ae8d AC |
3976 | /* Deal with a pragma Linker_Section on a subprogram. */ |
3977 | if ((kind == E_Function || kind == E_Procedure) | |
3978 | && Present (Linker_Section_Pragma (gnat_entity))) | |
3979 | prepend_one_attribute_pragma (&attr_list, | |
3980 | Linker_Section_Pragma (gnat_entity)); | |
3981 | ||
a1ab4c31 AC |
3982 | /* If we are defining the subprogram and it has an Address clause |
3983 | we must get the address expression from the saved GCC tree for the | |
3984 | subprogram if it has a Freeze_Node. Otherwise, we elaborate | |
3985 | the address expression here since the front-end has guaranteed | |
3986 | in that case that the elaboration has no effects. If there is | |
3987 | an Address clause and we are not defining the object, just | |
3988 | make it a constant. */ | |
3989 | if (Present (Address_Clause (gnat_entity))) | |
3990 | { | |
3991 | tree gnu_address = NULL_TREE; | |
3992 | ||
3993 | if (definition) | |
3994 | gnu_address | |
3995 | = (present_gnu_tree (gnat_entity) | |
3996 | ? get_gnu_tree (gnat_entity) | |
3997 | : gnat_to_gnu (Expression (Address_Clause (gnat_entity)))); | |
3998 | ||
3999 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
4000 | ||
4001 | /* Convert the type of the object to a reference type that can | |
b3b5c6a2 | 4002 | alias everything as per RM 13.3(19). */ |
a1ab4c31 AC |
4003 | gnu_type |
4004 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
4005 | if (gnu_address) | |
4006 | gnu_address = convert (gnu_type, gnu_address); | |
4007 | ||
4008 | gnu_decl | |
0fb2335d | 4009 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
a1ab4c31 | 4010 | gnu_address, false, Is_Public (gnat_entity), |
2056c5ed | 4011 | extern_flag, false, false, artificial_p, |
c1a569ef | 4012 | debug_info_p, NULL, gnat_entity); |
a1ab4c31 AC |
4013 | DECL_BY_REF_P (gnu_decl) = 1; |
4014 | } | |
4015 | ||
9182f718 | 4016 | /* If this is a mere subprogram type, just create the declaration. */ |
a1ab4c31 | 4017 | else if (kind == E_Subprogram_Type) |
74746d49 EB |
4018 | { |
4019 | process_attributes (&gnu_type, &attr_list, false, gnat_entity); | |
2056c5ed | 4020 | |
74746d49 | 4021 | gnu_decl |
c1a569ef | 4022 | = create_type_decl (gnu_entity_name, gnu_type, artificial_p, |
74746d49 EB |
4023 | debug_info_p, gnat_entity); |
4024 | } | |
1e55d29a | 4025 | |
9182f718 EB |
4026 | /* Otherwise create the subprogram declaration with the external name, |
4027 | the type and the parameter list. However, if this a reference to | |
4028 | the allocation routines, reuse the canonical declaration nodes as | |
4029 | they come with special properties. */ | |
a1ab4c31 AC |
4030 | else |
4031 | { | |
9182f718 EB |
4032 | if (extern_flag && gnu_ext_name == DECL_NAME (malloc_decl)) |
4033 | gnu_decl = malloc_decl; | |
4034 | else if (extern_flag && gnu_ext_name == DECL_NAME (realloc_decl)) | |
4035 | gnu_decl = realloc_decl; | |
4036 | else | |
4037 | { | |
4038 | gnu_decl | |
4039 | = create_subprog_decl (gnu_entity_name, gnu_ext_name, | |
4040 | gnu_type, gnu_param_list, | |
4041 | inline_status, public_flag, | |
4042 | extern_flag, artificial_p, | |
ff9baa5f PMR |
4043 | debug_info_p, |
4044 | definition && imported_p, attr_list, | |
4045 | gnat_entity); | |
9182f718 EB |
4046 | |
4047 | DECL_STUBBED_P (gnu_decl) | |
4048 | = (Convention (gnat_entity) == Convention_Stubbed); | |
4049 | } | |
a1ab4c31 AC |
4050 | } |
4051 | } | |
4052 | break; | |
4053 | ||
4054 | case E_Incomplete_Type: | |
4055 | case E_Incomplete_Subtype: | |
4056 | case E_Private_Type: | |
4057 | case E_Private_Subtype: | |
4058 | case E_Limited_Private_Type: | |
4059 | case E_Limited_Private_Subtype: | |
4060 | case E_Record_Type_With_Private: | |
4061 | case E_Record_Subtype_With_Private: | |
4062 | { | |
1e55d29a | 4063 | const bool is_from_limited_with |
bd769c83 | 4064 | = (IN (kind, Incomplete_Kind) && From_Limited_With (gnat_entity)); |
a1ab4c31 AC |
4065 | /* Get the "full view" of this entity. If this is an incomplete |
4066 | entity from a limited with, treat its non-limited view as the | |
4067 | full view. Otherwise, use either the full view or the underlying | |
4068 | full view, whichever is present. This is used in all the tests | |
4069 | below. */ | |
1e55d29a | 4070 | const Entity_Id full_view |
bd769c83 | 4071 | = is_from_limited_with |
a1ab4c31 AC |
4072 | ? Non_Limited_View (gnat_entity) |
4073 | : Present (Full_View (gnat_entity)) | |
4074 | ? Full_View (gnat_entity) | |
bf0b0e5e AC |
4075 | : IN (kind, Private_Kind) |
4076 | ? Underlying_Full_View (gnat_entity) | |
4077 | : Empty; | |
a1ab4c31 AC |
4078 | |
4079 | /* If this is an incomplete type with no full view, it must be a Taft | |
8234d02a EB |
4080 | Amendment type or an incomplete type coming from a limited context, |
4081 | in which cases we return a dummy type. Otherwise, we just get the | |
4082 | type from its Etype. */ | |
a1ab4c31 AC |
4083 | if (No (full_view)) |
4084 | { | |
4085 | if (kind == E_Incomplete_Type) | |
10069d53 EB |
4086 | { |
4087 | gnu_type = make_dummy_type (gnat_entity); | |
4088 | gnu_decl = TYPE_STUB_DECL (gnu_type); | |
4089 | } | |
a1ab4c31 AC |
4090 | else |
4091 | { | |
afc737f0 EB |
4092 | gnu_decl |
4093 | = gnat_to_gnu_entity (Etype (gnat_entity), NULL_TREE, false); | |
a1ab4c31 AC |
4094 | maybe_present = true; |
4095 | } | |
a1ab4c31 AC |
4096 | } |
4097 | ||
1e55d29a | 4098 | /* Or else, if we already made a type for the full view, reuse it. */ |
a1ab4c31 | 4099 | else if (present_gnu_tree (full_view)) |
1e55d29a | 4100 | gnu_decl = get_gnu_tree (full_view); |
a1ab4c31 | 4101 | |
1e55d29a EB |
4102 | /* Or else, if we are not defining the type or there is no freeze |
4103 | node on it, get the type for the full view. Likewise if this is | |
4104 | a limited_with'ed type not declared in the main unit, which can | |
4105 | happen for incomplete formal types instantiated on a type coming | |
4106 | from a limited_with clause. */ | |
a1ab4c31 | 4107 | else if (!definition |
1e55d29a | 4108 | || No (Freeze_Node (full_view)) |
bd769c83 EB |
4109 | || (is_from_limited_with |
4110 | && !In_Extended_Main_Code_Unit (full_view))) | |
a1ab4c31 | 4111 | { |
afc737f0 | 4112 | gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, false); |
a1ab4c31 | 4113 | maybe_present = true; |
a1ab4c31 AC |
4114 | } |
4115 | ||
1e55d29a EB |
4116 | /* Otherwise, make a dummy type entry which will be replaced later. |
4117 | Save it as the full declaration's type so we can do any needed | |
4118 | updates when we see it. */ | |
4119 | else | |
4120 | { | |
4121 | gnu_type = make_dummy_type (gnat_entity); | |
4122 | gnu_decl = TYPE_STUB_DECL (gnu_type); | |
4123 | if (Has_Completion_In_Body (gnat_entity)) | |
4124 | DECL_TAFT_TYPE_P (gnu_decl) = 1; | |
d5ebeb8c | 4125 | save_gnu_tree (full_view, gnu_decl, false); |
1e55d29a | 4126 | } |
a1ab4c31 | 4127 | } |
1e55d29a | 4128 | break; |
a1ab4c31 | 4129 | |
a1ab4c31 | 4130 | case E_Class_Wide_Type: |
f08863f9 | 4131 | /* Class-wide types are always transformed into their root type. */ |
afc737f0 | 4132 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, false); |
a1ab4c31 AC |
4133 | maybe_present = true; |
4134 | break; | |
4135 | ||
a1ab4c31 AC |
4136 | case E_Protected_Type: |
4137 | case E_Protected_Subtype: | |
c4833de1 EB |
4138 | case E_Task_Type: |
4139 | case E_Task_Subtype: | |
4140 | /* If we are just annotating types and have no equivalent record type, | |
4141 | just return void_type, except for root types that have discriminants | |
4142 | because the discriminants will very likely be used in the declarative | |
4143 | part of the associated body so they need to be translated. */ | |
42a5e410 | 4144 | if (type_annotate_only && gnat_equiv_type == gnat_entity) |
c4833de1 EB |
4145 | { |
4146 | if (Has_Discriminants (gnat_entity) | |
4147 | && Root_Type (gnat_entity) == gnat_entity) | |
4148 | { | |
4149 | tree gnu_field_list = NULL_TREE; | |
4150 | Entity_Id gnat_field; | |
4151 | ||
4152 | /* This is a minimal version of the E_Record_Type handling. */ | |
4153 | gnu_type = make_node (RECORD_TYPE); | |
4154 | TYPE_NAME (gnu_type) = gnu_entity_name; | |
4155 | ||
4156 | for (gnat_field = First_Stored_Discriminant (gnat_entity); | |
4157 | Present (gnat_field); | |
4158 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
4159 | { | |
4160 | tree gnu_field | |
4161 | = gnat_to_gnu_field (gnat_field, gnu_type, false, | |
4162 | definition, debug_info_p); | |
4163 | ||
4164 | save_gnu_tree (gnat_field, | |
4165 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
4166 | build0 (PLACEHOLDER_EXPR, gnu_type), | |
4167 | gnu_field, NULL_TREE), | |
4168 | true); | |
4169 | ||
4170 | DECL_CHAIN (gnu_field) = gnu_field_list; | |
4171 | gnu_field_list = gnu_field; | |
4172 | } | |
4173 | ||
68ec5613 EB |
4174 | finish_record_type (gnu_type, nreverse (gnu_field_list), 0, |
4175 | false); | |
c4833de1 EB |
4176 | } |
4177 | else | |
4178 | gnu_type = void_type_node; | |
4179 | } | |
4180 | ||
4181 | /* Concurrent types are always transformed into their record type. */ | |
a1ab4c31 | 4182 | else |
afc737f0 | 4183 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, false); |
a1ab4c31 AC |
4184 | maybe_present = true; |
4185 | break; | |
4186 | ||
4187 | case E_Label: | |
88a94e2b | 4188 | gnu_decl = create_label_decl (gnu_entity_name, gnat_entity); |
a1ab4c31 AC |
4189 | break; |
4190 | ||
4191 | case E_Block: | |
4192 | case E_Loop: | |
4193 | /* Nothing at all to do here, so just return an ERROR_MARK and claim | |
4194 | we've already saved it, so we don't try to. */ | |
4195 | gnu_decl = error_mark_node; | |
4196 | saved = true; | |
4197 | break; | |
4198 | ||
d2c03c72 EB |
4199 | case E_Abstract_State: |
4200 | /* This is a SPARK annotation that only reaches here when compiling in | |
c8dbf886 | 4201 | ASIS mode. */ |
d2c03c72 | 4202 | gcc_assert (type_annotate_only); |
c8dbf886 EB |
4203 | gnu_decl = error_mark_node; |
4204 | saved = true; | |
4205 | break; | |
d2c03c72 | 4206 | |
a1ab4c31 AC |
4207 | default: |
4208 | gcc_unreachable (); | |
4209 | } | |
4210 | ||
4211 | /* If we had a case where we evaluated another type and it might have | |
4212 | defined this one, handle it here. */ | |
4213 | if (maybe_present && present_gnu_tree (gnat_entity)) | |
4214 | { | |
4215 | gnu_decl = get_gnu_tree (gnat_entity); | |
4216 | saved = true; | |
4217 | } | |
4218 | ||
4219 | /* If we are processing a type and there is either no decl for it or | |
4220 | we just made one, do some common processing for the type, such as | |
4221 | handling alignment and possible padding. */ | |
a8e05f92 | 4222 | if (is_type && (!gnu_decl || this_made_decl)) |
a1ab4c31 | 4223 | { |
d5ebeb8c EB |
4224 | gcc_assert (!TYPE_IS_DUMMY_P (gnu_type)); |
4225 | ||
74746d49 | 4226 | /* Process the attributes, if not already done. Note that the type is |
78df6221 | 4227 | already defined so we cannot pass true for IN_PLACE here. */ |
74746d49 EB |
4228 | process_attributes (&gnu_type, &attr_list, false, gnat_entity); |
4229 | ||
a1ab4c31 AC |
4230 | /* ??? Don't set the size for a String_Literal since it is either |
4231 | confirming or we don't handle it properly (if the low bound is | |
4232 | non-constant). */ | |
4233 | if (!gnu_size && kind != E_String_Literal_Subtype) | |
fc893455 AC |
4234 | { |
4235 | Uint gnat_size = Known_Esize (gnat_entity) | |
4236 | ? Esize (gnat_entity) : RM_Size (gnat_entity); | |
4237 | gnu_size | |
4238 | = validate_size (gnat_size, gnu_type, gnat_entity, TYPE_DECL, | |
4239 | false, Has_Size_Clause (gnat_entity)); | |
4240 | } | |
a1ab4c31 AC |
4241 | |
4242 | /* If a size was specified, see if we can make a new type of that size | |
4243 | by rearranging the type, for example from a fat to a thin pointer. */ | |
4244 | if (gnu_size) | |
4245 | { | |
4246 | gnu_type | |
4247 | = make_type_from_size (gnu_type, gnu_size, | |
4248 | Has_Biased_Representation (gnat_entity)); | |
4249 | ||
4250 | if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0) | |
4251 | && operand_equal_p (rm_size (gnu_type), gnu_size, 0)) | |
842d4ee2 | 4252 | gnu_size = NULL_TREE; |
a1ab4c31 AC |
4253 | } |
4254 | ||
4aecc2f8 EB |
4255 | /* If the alignment has not already been processed and this is not |
4256 | an unconstrained array type, see if an alignment is specified. | |
a1ab4c31 AC |
4257 | If not, we pick a default alignment for atomic objects. */ |
4258 | if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) | |
4259 | ; | |
4260 | else if (Known_Alignment (gnat_entity)) | |
4261 | { | |
4262 | align = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
4263 | TYPE_ALIGN (gnu_type)); | |
4264 | ||
4265 | /* Warn on suspiciously large alignments. This should catch | |
4266 | errors about the (alignment,byte)/(size,bit) discrepancy. */ | |
4267 | if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity)) | |
4268 | { | |
4269 | tree size; | |
4270 | ||
4271 | /* If a size was specified, take it into account. Otherwise | |
e1e5852c EB |
4272 | use the RM size for records or unions as the type size has |
4273 | already been adjusted to the alignment. */ | |
a1ab4c31 AC |
4274 | if (gnu_size) |
4275 | size = gnu_size; | |
e1e5852c | 4276 | else if (RECORD_OR_UNION_TYPE_P (gnu_type) |
315cff15 | 4277 | && !TYPE_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
4278 | size = rm_size (gnu_type); |
4279 | else | |
4280 | size = TYPE_SIZE (gnu_type); | |
4281 | ||
4282 | /* Consider an alignment as suspicious if the alignment/size | |
4283 | ratio is greater or equal to the byte/bit ratio. */ | |
cc269bb6 | 4284 | if (tree_fits_uhwi_p (size) |
eb1ce453 | 4285 | && align >= tree_to_uhwi (size) * BITS_PER_UNIT) |
a1ab4c31 AC |
4286 | post_error_ne ("?suspiciously large alignment specified for&", |
4287 | Expression (Alignment_Clause (gnat_entity)), | |
4288 | gnat_entity); | |
4289 | } | |
4290 | } | |
f797c2b7 | 4291 | else if (Is_Atomic_Or_VFA (gnat_entity) && !gnu_size |
cc269bb6 | 4292 | && tree_fits_uhwi_p (TYPE_SIZE (gnu_type)) |
a1ab4c31 AC |
4293 | && integer_pow2p (TYPE_SIZE (gnu_type))) |
4294 | align = MIN (BIGGEST_ALIGNMENT, | |
ae7e9ddd | 4295 | tree_to_uhwi (TYPE_SIZE (gnu_type))); |
f797c2b7 | 4296 | else if (Is_Atomic_Or_VFA (gnat_entity) && gnu_size |
cc269bb6 | 4297 | && tree_fits_uhwi_p (gnu_size) |
a1ab4c31 | 4298 | && integer_pow2p (gnu_size)) |
ae7e9ddd | 4299 | align = MIN (BIGGEST_ALIGNMENT, tree_to_uhwi (gnu_size)); |
a1ab4c31 AC |
4300 | |
4301 | /* See if we need to pad the type. If we did, and made a record, | |
4302 | the name of the new type may be changed. So get it back for | |
4303 | us when we make the new TYPE_DECL below. */ | |
4304 | if (gnu_size || align > 0) | |
4305 | gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, | |
9a1c0fd9 | 4306 | false, !gnu_decl, definition, false); |
a1ab4c31 | 4307 | |
315cff15 | 4308 | if (TYPE_IS_PADDING_P (gnu_type)) |
9dba4b55 | 4309 | gnu_entity_name = TYPE_IDENTIFIER (gnu_type); |
a1ab4c31 | 4310 | |
842d4ee2 EB |
4311 | /* Now set the RM size of the type. We cannot do it before padding |
4312 | because we need to accept arbitrary RM sizes on integral types. */ | |
a1ab4c31 AC |
4313 | set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity); |
4314 | ||
4315 | /* If we are at global level, GCC will have applied variable_size to | |
4316 | the type, but that won't have done anything. So, if it's not | |
4317 | a constant or self-referential, call elaborate_expression_1 to | |
4318 | make a variable for the size rather than calculating it each time. | |
4319 | Handle both the RM size and the actual size. */ | |
b0ad2d78 | 4320 | if (TYPE_SIZE (gnu_type) |
a1ab4c31 | 4321 | && !TREE_CONSTANT (TYPE_SIZE (gnu_type)) |
b0ad2d78 EB |
4322 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) |
4323 | && global_bindings_p ()) | |
a1ab4c31 | 4324 | { |
da01bfee EB |
4325 | tree size = TYPE_SIZE (gnu_type); |
4326 | ||
4327 | TYPE_SIZE (gnu_type) | |
bf44701f EB |
4328 | = elaborate_expression_1 (size, gnat_entity, "SIZE", definition, |
4329 | false); | |
da01bfee EB |
4330 | |
4331 | /* ??? For now, store the size as a multiple of the alignment in | |
4332 | bytes so that we can see the alignment from the tree. */ | |
4333 | TYPE_SIZE_UNIT (gnu_type) | |
4334 | = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_type), gnat_entity, | |
bf44701f | 4335 | "SIZE_A_UNIT", definition, false, |
da01bfee EB |
4336 | TYPE_ALIGN (gnu_type)); |
4337 | ||
4338 | /* ??? gnu_type may come from an existing type so the MULT_EXPR node | |
4339 | may not be marked by the call to create_type_decl below. */ | |
4340 | MARK_VISITED (TYPE_SIZE_UNIT (gnu_type)); | |
4341 | ||
4342 | if (TREE_CODE (gnu_type) == RECORD_TYPE) | |
a1ab4c31 | 4343 | { |
35e2a4b8 | 4344 | tree variant_part = get_variant_part (gnu_type); |
da01bfee | 4345 | tree ada_size = TYPE_ADA_SIZE (gnu_type); |
a1ab4c31 | 4346 | |
35e2a4b8 EB |
4347 | if (variant_part) |
4348 | { | |
4349 | tree union_type = TREE_TYPE (variant_part); | |
4350 | tree offset = DECL_FIELD_OFFSET (variant_part); | |
4351 | ||
4352 | /* If the position of the variant part is constant, subtract | |
4353 | it from the size of the type of the parent to get the new | |
4354 | size. This manual CSE reduces the data size. */ | |
4355 | if (TREE_CODE (offset) == INTEGER_CST) | |
4356 | { | |
4357 | tree bitpos = DECL_FIELD_BIT_OFFSET (variant_part); | |
4358 | TYPE_SIZE (union_type) | |
4359 | = size_binop (MINUS_EXPR, TYPE_SIZE (gnu_type), | |
4360 | bit_from_pos (offset, bitpos)); | |
4361 | TYPE_SIZE_UNIT (union_type) | |
4362 | = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (gnu_type), | |
4363 | byte_from_pos (offset, bitpos)); | |
4364 | } | |
4365 | else | |
4366 | { | |
4367 | TYPE_SIZE (union_type) | |
4368 | = elaborate_expression_1 (TYPE_SIZE (union_type), | |
bf44701f | 4369 | gnat_entity, "VSIZE", |
35e2a4b8 EB |
4370 | definition, false); |
4371 | ||
4372 | /* ??? For now, store the size as a multiple of the | |
4373 | alignment in bytes so that we can see the alignment | |
4374 | from the tree. */ | |
4375 | TYPE_SIZE_UNIT (union_type) | |
4376 | = elaborate_expression_2 (TYPE_SIZE_UNIT (union_type), | |
bf44701f | 4377 | gnat_entity, "VSIZE_A_UNIT", |
35e2a4b8 EB |
4378 | definition, false, |
4379 | TYPE_ALIGN (union_type)); | |
4380 | ||
4381 | /* ??? For now, store the offset as a multiple of the | |
4382 | alignment in bytes so that we can see the alignment | |
4383 | from the tree. */ | |
4384 | DECL_FIELD_OFFSET (variant_part) | |
bf44701f EB |
4385 | = elaborate_expression_2 (offset, gnat_entity, |
4386 | "VOFFSET", definition, false, | |
35e2a4b8 EB |
4387 | DECL_OFFSET_ALIGN |
4388 | (variant_part)); | |
4389 | } | |
4390 | ||
4391 | DECL_SIZE (variant_part) = TYPE_SIZE (union_type); | |
4392 | DECL_SIZE_UNIT (variant_part) = TYPE_SIZE_UNIT (union_type); | |
4393 | } | |
4394 | ||
da01bfee EB |
4395 | if (operand_equal_p (ada_size, size, 0)) |
4396 | ada_size = TYPE_SIZE (gnu_type); | |
4397 | else | |
4398 | ada_size | |
bf44701f | 4399 | = elaborate_expression_1 (ada_size, gnat_entity, "RM_SIZE", |
da01bfee EB |
4400 | definition, false); |
4401 | SET_TYPE_ADA_SIZE (gnu_type, ada_size); | |
4402 | } | |
a1ab4c31 AC |
4403 | } |
4404 | ||
b0ad2d78 EB |
4405 | /* Similarly, if this is a record type or subtype at global level, call |
4406 | elaborate_expression_2 on any field position. Skip any fields that | |
4407 | we haven't made trees for to avoid problems with class-wide types. */ | |
4408 | if (IN (kind, Record_Kind) && global_bindings_p ()) | |
a1ab4c31 AC |
4409 | for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp); |
4410 | gnat_temp = Next_Entity (gnat_temp)) | |
4411 | if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp)) | |
4412 | { | |
4413 | tree gnu_field = get_gnu_tree (gnat_temp); | |
4414 | ||
da01bfee EB |
4415 | /* ??? For now, store the offset as a multiple of the alignment |
4416 | in bytes so that we can see the alignment from the tree. */ | |
b0ad2d78 EB |
4417 | if (!TREE_CONSTANT (DECL_FIELD_OFFSET (gnu_field)) |
4418 | && !CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field))) | |
a1ab4c31 | 4419 | { |
da01bfee EB |
4420 | DECL_FIELD_OFFSET (gnu_field) |
4421 | = elaborate_expression_2 (DECL_FIELD_OFFSET (gnu_field), | |
bf44701f EB |
4422 | gnat_temp, "OFFSET", definition, |
4423 | false, | |
da01bfee EB |
4424 | DECL_OFFSET_ALIGN (gnu_field)); |
4425 | ||
4426 | /* ??? The context of gnu_field is not necessarily gnu_type | |
4427 | so the MULT_EXPR node built above may not be marked by | |
4428 | the call to create_type_decl below. */ | |
b0ad2d78 | 4429 | MARK_VISITED (DECL_FIELD_OFFSET (gnu_field)); |
a1ab4c31 AC |
4430 | } |
4431 | } | |
4432 | ||
f797c2b7 | 4433 | if (Is_Atomic_Or_VFA (gnat_entity)) |
86a8ba5b | 4434 | check_ok_for_atomic_type (gnu_type, gnat_entity, false); |
a1ab4c31 | 4435 | |
4aecc2f8 EB |
4436 | /* If this is not an unconstrained array type, set some flags. */ |
4437 | if (TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE) | |
4438 | { | |
ea09ecc5 EB |
4439 | /* Tell the middle-end that objects of tagged types are guaranteed to |
4440 | be properly aligned. This is necessary because conversions to the | |
4441 | class-wide type are translated into conversions to the root type, | |
4442 | which can be less aligned than some of its derived types. */ | |
4443 | if (Is_Tagged_Type (gnat_entity) | |
4444 | || Is_Class_Wide_Equivalent_Type (gnat_entity)) | |
4445 | TYPE_ALIGN_OK (gnu_type) = 1; | |
4446 | ||
4447 | /* Record whether the type is passed by reference. */ | |
4448 | if (Is_By_Reference_Type (gnat_entity) && !VOID_TYPE_P (gnu_type)) | |
4449 | TYPE_BY_REFERENCE_P (gnu_type) = 1; | |
4450 | ||
4451 | /* Record whether an alignment clause was specified. */ | |
4aecc2f8 EB |
4452 | if (Present (Alignment_Clause (gnat_entity))) |
4453 | TYPE_USER_ALIGN (gnu_type) = 1; | |
4454 | ||
ea09ecc5 | 4455 | /* Record whether a pragma Universal_Aliasing was specified. */ |
1e55d29a | 4456 | if (Universal_Aliasing (gnat_entity) && !TYPE_IS_DUMMY_P (gnu_type)) |
f797c2b7 EB |
4457 | TYPE_UNIVERSAL_ALIASING_P (gnu_type) = 1; |
4458 | ||
4459 | /* If it is passed by reference, force BLKmode to ensure that | |
4460 | objects of this type will always be put in memory. */ | |
ea09ecc5 | 4461 | if (AGGREGATE_TYPE_P (gnu_type) && TYPE_BY_REFERENCE_P (gnu_type)) |
f797c2b7 | 4462 | SET_TYPE_MODE (gnu_type, BLKmode); |
4aecc2f8 | 4463 | } |
a1ab4c31 | 4464 | |
794511d2 EB |
4465 | /* If this is a derived type, relate its alias set to that of its parent |
4466 | to avoid troubles when a call to an inherited primitive is inlined in | |
4467 | a context where a derived object is accessed. The inlined code works | |
4468 | on the parent view so the resulting code may access the same object | |
4469 | using both the parent and the derived alias sets, which thus have to | |
4470 | conflict. As the same issue arises with component references, the | |
4471 | parent alias set also has to conflict with composite types enclosing | |
4472 | derived components. For instance, if we have: | |
4473 | ||
4474 | type D is new T; | |
4475 | type R is record | |
4476 | Component : D; | |
4477 | end record; | |
4478 | ||
4479 | we want T to conflict with both D and R, in addition to R being a | |
4480 | superset of D by record/component construction. | |
4481 | ||
4482 | One way to achieve this is to perform an alias set copy from the | |
4483 | parent to the derived type. This is not quite appropriate, though, | |
4484 | as we don't want separate derived types to conflict with each other: | |
4485 | ||
4486 | type I1 is new Integer; | |
4487 | type I2 is new Integer; | |
4488 | ||
4489 | We want I1 and I2 to both conflict with Integer but we do not want | |
4490 | I1 to conflict with I2, and an alias set copy on derivation would | |
4491 | have that effect. | |
4492 | ||
4493 | The option chosen is to make the alias set of the derived type a | |
4494 | superset of that of its parent type. It trivially fulfills the | |
4495 | simple requirement for the Integer derivation example above, and | |
4496 | the component case as well by superset transitivity: | |
4497 | ||
4498 | superset superset | |
4499 | R ----------> D ----------> T | |
4500 | ||
d8e94f79 EB |
4501 | However, for composite types, conversions between derived types are |
4502 | translated into VIEW_CONVERT_EXPRs so a sequence like: | |
4503 | ||
4504 | type Comp1 is new Comp; | |
4505 | type Comp2 is new Comp; | |
4506 | procedure Proc (C : Comp1); | |
4507 | ||
4508 | C : Comp2; | |
4509 | Proc (Comp1 (C)); | |
4510 | ||
4511 | is translated into: | |
4512 | ||
4513 | C : Comp2; | |
4514 | Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C)); | |
4515 | ||
4516 | and gimplified into: | |
4517 | ||
4518 | C : Comp2; | |
4519 | Comp1 *C.0; | |
4520 | C.0 = (Comp1 *) &C; | |
4521 | Proc (C.0); | |
4522 | ||
4523 | i.e. generates code involving type punning. Therefore, Comp1 needs | |
4524 | to conflict with Comp2 and an alias set copy is required. | |
4525 | ||
794511d2 | 4526 | The language rules ensure the parent type is already frozen here. */ |
9d11273c EB |
4527 | if (kind != E_Subprogram_Type |
4528 | && Is_Derived_Type (gnat_entity) | |
4529 | && !type_annotate_only) | |
794511d2 | 4530 | { |
384e3fb1 | 4531 | Entity_Id gnat_parent_type = Underlying_Type (Etype (gnat_entity)); |
8c44fc0f EB |
4532 | /* For constrained packed array subtypes, the implementation type is |
4533 | used instead of the nominal type. */ | |
384e3fb1 | 4534 | if (kind == E_Array_Subtype |
8c44fc0f | 4535 | && Is_Constrained (gnat_entity) |
384e3fb1 JM |
4536 | && Present (Packed_Array_Impl_Type (gnat_parent_type))) |
4537 | gnat_parent_type = Packed_Array_Impl_Type (gnat_parent_type); | |
4538 | relate_alias_sets (gnu_type, gnat_to_gnu_type (gnat_parent_type), | |
d8e94f79 EB |
4539 | Is_Composite_Type (gnat_entity) |
4540 | ? ALIAS_SET_COPY : ALIAS_SET_SUPERSET); | |
794511d2 EB |
4541 | } |
4542 | ||
773076a5 EB |
4543 | /* Finally get to the appropriate variant, except for the implementation |
4544 | type of a packed array because the GNU type might be further adjusted | |
4545 | when the original array type is itself processed. */ | |
4546 | if (Treat_As_Volatile (gnat_entity) | |
4547 | && !Is_Packed_Array_Impl_Type (gnat_entity)) | |
41683e1a EB |
4548 | { |
4549 | const int quals | |
4550 | = TYPE_QUAL_VOLATILE | |
4551 | | (Is_Atomic_Or_VFA (gnat_entity) ? TYPE_QUAL_ATOMIC : 0); | |
4552 | gnu_type = change_qualified_type (gnu_type, quals); | |
4553 | } | |
4554 | ||
4d39941e EB |
4555 | /* If we already made a decl, just set the type, otherwise create it. */ |
4556 | if (gnu_decl) | |
d5ebeb8c EB |
4557 | { |
4558 | TREE_TYPE (gnu_decl) = gnu_type; | |
4559 | TYPE_STUB_DECL (gnu_type) = gnu_decl; | |
4560 | } | |
4d39941e EB |
4561 | else |
4562 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, artificial_p, | |
4563 | debug_info_p, gnat_entity); | |
d5ebeb8c EB |
4564 | } |
4565 | ||
4566 | /* If we got a type that is not dummy, back-annotate the alignment of the | |
4567 | type if not already in the tree. Likewise for the size, if any. */ | |
4568 | if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))) | |
4569 | { | |
4570 | gnu_type = TREE_TYPE (gnu_decl); | |
4571 | ||
a1ab4c31 | 4572 | if (Unknown_Alignment (gnat_entity)) |
caa9d12a EB |
4573 | { |
4574 | unsigned int double_align, align; | |
4575 | bool is_capped_double, align_clause; | |
4576 | ||
4577 | /* If the default alignment of "double" or larger scalar types is | |
4578 | specifically capped and this is not an array with an alignment | |
4579 | clause on the component type, return the cap. */ | |
4580 | if ((double_align = double_float_alignment) > 0) | |
4581 | is_capped_double | |
4582 | = is_double_float_or_array (gnat_entity, &align_clause); | |
4583 | else if ((double_align = double_scalar_alignment) > 0) | |
4584 | is_capped_double | |
4585 | = is_double_scalar_or_array (gnat_entity, &align_clause); | |
4586 | else | |
4587 | is_capped_double = align_clause = false; | |
4588 | ||
4589 | if (is_capped_double && !align_clause) | |
4590 | align = double_align; | |
4591 | else | |
4592 | align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT; | |
4593 | ||
4594 | Set_Alignment (gnat_entity, UI_From_Int (align)); | |
4595 | } | |
a1ab4c31 AC |
4596 | |
4597 | if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type)) | |
4598 | { | |
a1ab4c31 AC |
4599 | tree gnu_size = TYPE_SIZE (gnu_type); |
4600 | ||
58c8f770 | 4601 | /* If the size is self-referential, annotate the maximum value. */ |
a1ab4c31 AC |
4602 | if (CONTAINS_PLACEHOLDER_P (gnu_size)) |
4603 | gnu_size = max_size (gnu_size, true); | |
4604 | ||
b38086f0 EB |
4605 | /* If we are just annotating types and the type is tagged, the tag |
4606 | and the parent components are not generated by the front-end so | |
c00d5b12 | 4607 | alignment and sizes must be adjusted if there is no rep clause. */ |
b38086f0 EB |
4608 | if (type_annotate_only |
4609 | && Is_Tagged_Type (gnat_entity) | |
c00d5b12 | 4610 | && Unknown_RM_Size (gnat_entity) |
b38086f0 EB |
4611 | && !VOID_TYPE_P (gnu_type) |
4612 | && (!TYPE_FIELDS (gnu_type) | |
4613 | || integer_zerop (bit_position (TYPE_FIELDS (gnu_type))))) | |
a1ab4c31 | 4614 | { |
c00d5b12 | 4615 | tree offset; |
a1ab4c31 AC |
4616 | |
4617 | if (Is_Derived_Type (gnat_entity)) | |
4618 | { | |
b38086f0 EB |
4619 | Entity_Id gnat_parent = Etype (Base_Type (gnat_entity)); |
4620 | offset = UI_To_gnu (Esize (gnat_parent), bitsizetype); | |
4621 | Set_Alignment (gnat_entity, Alignment (gnat_parent)); | |
a1ab4c31 AC |
4622 | } |
4623 | else | |
c00d5b12 EB |
4624 | { |
4625 | unsigned int align | |
4626 | = MAX (TYPE_ALIGN (gnu_type), POINTER_SIZE) / BITS_PER_UNIT; | |
4627 | offset = bitsize_int (POINTER_SIZE); | |
4628 | Set_Alignment (gnat_entity, UI_From_Int (align)); | |
4629 | } | |
58c8f770 | 4630 | |
b38086f0 EB |
4631 | if (TYPE_FIELDS (gnu_type)) |
4632 | offset | |
4633 | = round_up (offset, DECL_ALIGN (TYPE_FIELDS (gnu_type))); | |
4634 | ||
58c8f770 | 4635 | gnu_size = size_binop (PLUS_EXPR, gnu_size, offset); |
b38086f0 | 4636 | gnu_size = round_up (gnu_size, POINTER_SIZE); |
c00d5b12 | 4637 | Uint uint_size = annotate_value (gnu_size); |
58c8f770 | 4638 | Set_RM_Size (gnat_entity, uint_size); |
c00d5b12 EB |
4639 | Set_Esize (gnat_entity, uint_size); |
4640 | } | |
4641 | ||
4642 | /* If there is a rep clause, only adjust alignment and Esize. */ | |
4643 | else if (type_annotate_only && Is_Tagged_Type (gnat_entity)) | |
4644 | { | |
4645 | unsigned int align | |
4646 | = MAX (TYPE_ALIGN (gnu_type), POINTER_SIZE) / BITS_PER_UNIT; | |
4647 | Set_Alignment (gnat_entity, UI_From_Int (align)); | |
4648 | gnu_size = round_up (gnu_size, POINTER_SIZE); | |
4649 | Set_Esize (gnat_entity, annotate_value (gnu_size)); | |
a1ab4c31 | 4650 | } |
c00d5b12 EB |
4651 | |
4652 | /* Otherwise no adjustment is needed. */ | |
58c8f770 EB |
4653 | else |
4654 | Set_Esize (gnat_entity, annotate_value (gnu_size)); | |
a1ab4c31 AC |
4655 | } |
4656 | ||
d5ebeb8c | 4657 | if (Unknown_RM_Size (gnat_entity) && TYPE_SIZE (gnu_type)) |
a1ab4c31 AC |
4658 | Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type))); |
4659 | } | |
4660 | ||
a1ab4c31 | 4661 | /* If we haven't already, associate the ..._DECL node that we just made with |
2ddc34ba | 4662 | the input GNAT entity node. */ |
a1ab4c31 AC |
4663 | if (!saved) |
4664 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
4665 | ||
9a30c7c4 AC |
4666 | /* Now we are sure gnat_entity has a corresponding ..._DECL node, |
4667 | eliminate as many deferred computations as possible. */ | |
4668 | process_deferred_decl_context (false); | |
4669 | ||
c1abd261 EB |
4670 | /* If this is an enumeration or floating-point type, we were not able to set |
4671 | the bounds since they refer to the type. These are always static. */ | |
a1ab4c31 | 4672 | if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity))) |
e08add8e | 4673 | || (kind == E_Floating_Point_Type)) |
a1ab4c31 AC |
4674 | { |
4675 | tree gnu_scalar_type = gnu_type; | |
84fb43a1 | 4676 | tree gnu_low_bound, gnu_high_bound; |
a1ab4c31 AC |
4677 | |
4678 | /* If this is a padded type, we need to use the underlying type. */ | |
315cff15 | 4679 | if (TYPE_IS_PADDING_P (gnu_scalar_type)) |
a1ab4c31 AC |
4680 | gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type)); |
4681 | ||
4682 | /* If this is a floating point type and we haven't set a floating | |
4683 | point type yet, use this in the evaluation of the bounds. */ | |
4684 | if (!longest_float_type_node && kind == E_Floating_Point_Type) | |
c1abd261 | 4685 | longest_float_type_node = gnu_scalar_type; |
a1ab4c31 | 4686 | |
84fb43a1 EB |
4687 | gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity)); |
4688 | gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity)); | |
a1ab4c31 | 4689 | |
c1abd261 | 4690 | if (kind == E_Enumeration_Type) |
a1ab4c31 | 4691 | { |
84fb43a1 EB |
4692 | /* Enumeration types have specific RM bounds. */ |
4693 | SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound); | |
4694 | SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound); | |
a1ab4c31 | 4695 | } |
84fb43a1 EB |
4696 | else |
4697 | { | |
4698 | /* Floating-point types don't have specific RM bounds. */ | |
4699 | TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound; | |
4700 | TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound; | |
4701 | } | |
a1ab4c31 AC |
4702 | } |
4703 | ||
4704 | /* If we deferred processing of incomplete types, re-enable it. If there | |
80ec8b4c EB |
4705 | were no other disables and we have deferred types to process, do so. */ |
4706 | if (this_deferred | |
4707 | && --defer_incomplete_level == 0 | |
4708 | && defer_incomplete_list) | |
a1ab4c31 | 4709 | { |
80ec8b4c | 4710 | struct incomplete *p, *next; |
a1ab4c31 | 4711 | |
80ec8b4c EB |
4712 | /* We are back to level 0 for the deferring of incomplete types. |
4713 | But processing these incomplete types below may itself require | |
4714 | deferring, so preserve what we have and restart from scratch. */ | |
4715 | p = defer_incomplete_list; | |
4716 | defer_incomplete_list = NULL; | |
a1ab4c31 | 4717 | |
80ec8b4c EB |
4718 | for (; p; p = next) |
4719 | { | |
4720 | next = p->next; | |
a1ab4c31 | 4721 | |
80ec8b4c EB |
4722 | if (p->old_type) |
4723 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), | |
4724 | gnat_to_gnu_type (p->full_type)); | |
4725 | free (p); | |
a1ab4c31 | 4726 | } |
a1ab4c31 AC |
4727 | } |
4728 | ||
6ddf9843 EB |
4729 | /* If we are not defining this type, see if it's on one of the lists of |
4730 | incomplete types. If so, handle the list entry now. */ | |
4731 | if (is_type && !definition) | |
a1ab4c31 | 4732 | { |
6ddf9843 | 4733 | struct incomplete *p; |
a1ab4c31 | 4734 | |
6ddf9843 EB |
4735 | for (p = defer_incomplete_list; p; p = p->next) |
4736 | if (p->old_type && p->full_type == gnat_entity) | |
a1ab4c31 | 4737 | { |
6ddf9843 | 4738 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), |
a1ab4c31 | 4739 | TREE_TYPE (gnu_decl)); |
6ddf9843 EB |
4740 | p->old_type = NULL_TREE; |
4741 | } | |
4742 | ||
1e55d29a | 4743 | for (p = defer_limited_with_list; p; p = p->next) |
d3271136 EB |
4744 | if (p->old_type |
4745 | && (Non_Limited_View (p->full_type) == gnat_entity | |
4746 | || Full_View (p->full_type) == gnat_entity)) | |
6ddf9843 EB |
4747 | { |
4748 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), | |
4749 | TREE_TYPE (gnu_decl)); | |
7414a3c3 EB |
4750 | if (TYPE_DUMMY_IN_PROFILE_P (p->old_type)) |
4751 | update_profiles_with (p->old_type); | |
6ddf9843 | 4752 | p->old_type = NULL_TREE; |
a1ab4c31 AC |
4753 | } |
4754 | } | |
4755 | ||
4756 | if (this_global) | |
4757 | force_global--; | |
4758 | ||
b4680ca1 EB |
4759 | /* If this is a packed array type whose original array type is itself |
4760 | an Itype without freeze node, make sure the latter is processed. */ | |
1a4cb227 | 4761 | if (Is_Packed_Array_Impl_Type (gnat_entity) |
b4680ca1 EB |
4762 | && Is_Itype (Original_Array_Type (gnat_entity)) |
4763 | && No (Freeze_Node (Original_Array_Type (gnat_entity))) | |
4764 | && !present_gnu_tree (Original_Array_Type (gnat_entity))) | |
afc737f0 | 4765 | gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, false); |
a1ab4c31 AC |
4766 | |
4767 | return gnu_decl; | |
4768 | } | |
4769 | ||
4770 | /* Similar, but if the returned value is a COMPONENT_REF, return the | |
4771 | FIELD_DECL. */ | |
4772 | ||
4773 | tree | |
4774 | gnat_to_gnu_field_decl (Entity_Id gnat_entity) | |
4775 | { | |
afc737f0 | 4776 | tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, false); |
a1ab4c31 AC |
4777 | |
4778 | if (TREE_CODE (gnu_field) == COMPONENT_REF) | |
4779 | gnu_field = TREE_OPERAND (gnu_field, 1); | |
4780 | ||
4781 | return gnu_field; | |
4782 | } | |
4783 | ||
229077b0 EB |
4784 | /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return |
4785 | the GCC type corresponding to that entity. */ | |
4786 | ||
4787 | tree | |
4788 | gnat_to_gnu_type (Entity_Id gnat_entity) | |
4789 | { | |
4790 | tree gnu_decl; | |
4791 | ||
4792 | /* The back end never attempts to annotate generic types. */ | |
4793 | if (Is_Generic_Type (gnat_entity) && type_annotate_only) | |
4794 | return void_type_node; | |
4795 | ||
afc737f0 | 4796 | gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, false); |
229077b0 EB |
4797 | gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL); |
4798 | ||
4799 | return TREE_TYPE (gnu_decl); | |
4800 | } | |
4801 | ||
4802 | /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return | |
4803 | the unpadded version of the GCC type corresponding to that entity. */ | |
4804 | ||
4805 | tree | |
4806 | get_unpadded_type (Entity_Id gnat_entity) | |
4807 | { | |
4808 | tree type = gnat_to_gnu_type (gnat_entity); | |
4809 | ||
315cff15 | 4810 | if (TYPE_IS_PADDING_P (type)) |
229077b0 EB |
4811 | type = TREE_TYPE (TYPE_FIELDS (type)); |
4812 | ||
4813 | return type; | |
4814 | } | |
1228a6a6 | 4815 | |
28dd0055 EB |
4816 | /* Return whether the E_Subprogram_Type/E_Function/E_Procedure GNAT_ENTITY is |
4817 | a C++ imported method or equivalent. | |
4818 | ||
4819 | We use the predicate on 32-bit x86/Windows to find out whether we need to | |
4820 | use the "thiscall" calling convention for GNAT_ENTITY. This convention is | |
4821 | used for C++ methods (functions with METHOD_TYPE) by the back-end. */ | |
4822 | ||
4823 | bool | |
4824 | is_cplusplus_method (Entity_Id gnat_entity) | |
4825 | { | |
eae6758d EB |
4826 | /* A constructor is a method on the C++ side. We deal with it now because |
4827 | it is declared without the 'this' parameter in the sources and, although | |
4828 | the front-end will create a version with the 'this' parameter for code | |
4829 | generation purposes, we want to return true for both versions. */ | |
4830 | if (Is_Constructor (gnat_entity)) | |
4831 | return true; | |
4832 | ||
59909673 EB |
4833 | /* Check that the subprogram has C++ convention. */ |
4834 | if (Convention (gnat_entity) != Convention_CPP) | |
4835 | return false; | |
4836 | ||
eae6758d EB |
4837 | /* And that the type of the first parameter (indirectly) has it too. */ |
4838 | Entity_Id gnat_first = First_Formal (gnat_entity); | |
4839 | if (No (gnat_first)) | |
4840 | return false; | |
4841 | ||
4842 | Entity_Id gnat_type = Etype (gnat_first); | |
4843 | if (Is_Access_Type (gnat_type)) | |
4844 | gnat_type = Directly_Designated_Type (gnat_type); | |
4845 | if (Convention (gnat_type) != Convention_CPP) | |
4846 | return false; | |
4847 | ||
59909673 EB |
4848 | /* This is the main case: a C++ virtual method imported as a primitive |
4849 | operation of a tagged type. */ | |
4850 | if (Is_Dispatching_Operation (gnat_entity)) | |
4851 | return true; | |
4852 | ||
4853 | /* This is set on the E_Subprogram_Type built for a dispatching call. */ | |
4854 | if (Is_Dispatch_Table_Entity (gnat_entity)) | |
78df6221 | 4855 | return true; |
28dd0055 EB |
4856 | |
4857 | /* A thunk needs to be handled like its associated primitive operation. */ | |
4858 | if (Is_Subprogram (gnat_entity) && Is_Thunk (gnat_entity)) | |
78df6221 | 4859 | return true; |
28dd0055 | 4860 | |
59909673 EB |
4861 | /* Now on to the annoying case: a C++ non-virtual method, imported either |
4862 | as a non-primitive operation of a tagged type or as a primitive operation | |
4863 | of an untagged type. We cannot reliably differentiate these cases from | |
4864 | their static member or regular function equivalents in Ada, so we ask | |
4865 | the C++ side through the mangled name of the function, as the implicit | |
4866 | 'this' parameter is not encoded in the mangled name of a method. */ | |
4867 | if (Is_Subprogram (gnat_entity) && Present (Interface_Name (gnat_entity))) | |
4868 | { | |
4869 | String_Pointer sp = { NULL, NULL }; | |
4870 | Get_External_Name (gnat_entity, false, sp); | |
4871 | ||
4872 | void *mem; | |
4873 | struct demangle_component *cmp | |
4874 | = cplus_demangle_v3_components (Name_Buffer, | |
4875 | DMGL_GNU_V3 | |
4876 | | DMGL_TYPES | |
4877 | | DMGL_PARAMS | |
4878 | | DMGL_RET_DROP, | |
4879 | &mem); | |
4880 | if (!cmp) | |
4881 | return false; | |
4882 | ||
4883 | /* We need to release MEM once we have a successful demangling. */ | |
4884 | bool ret = false; | |
4885 | ||
4886 | if (cmp->type == DEMANGLE_COMPONENT_TYPED_NAME | |
4887 | && cmp->u.s_binary.right->type == DEMANGLE_COMPONENT_FUNCTION_TYPE | |
4888 | && (cmp = cmp->u.s_binary.right->u.s_binary.right) != NULL | |
4889 | && cmp->type == DEMANGLE_COMPONENT_ARGLIST) | |
4890 | { | |
4891 | /* Make sure there is at least one parameter in C++ too. */ | |
4892 | if (cmp->u.s_binary.left) | |
4893 | { | |
4894 | unsigned int n_ada_args = 0; | |
4895 | do { | |
4896 | n_ada_args++; | |
4897 | gnat_first = Next_Formal (gnat_first); | |
4898 | } while (Present (gnat_first)); | |
4899 | ||
4900 | unsigned int n_cpp_args = 0; | |
4901 | do { | |
4902 | n_cpp_args++; | |
4903 | cmp = cmp->u.s_binary.right; | |
4904 | } while (cmp); | |
4905 | ||
4906 | if (n_cpp_args < n_ada_args) | |
4907 | ret = true; | |
4908 | } | |
4909 | else | |
4910 | ret = true; | |
4911 | } | |
4912 | ||
4913 | free (mem); | |
4914 | ||
4915 | return ret; | |
4916 | } | |
28dd0055 | 4917 | |
78df6221 | 4918 | return false; |
28dd0055 EB |
4919 | } |
4920 | ||
7b56a91b | 4921 | /* Finalize the processing of From_Limited_With incomplete types. */ |
a1ab4c31 AC |
4922 | |
4923 | void | |
7b56a91b | 4924 | finalize_from_limited_with (void) |
a1ab4c31 | 4925 | { |
6ddf9843 EB |
4926 | struct incomplete *p, *next; |
4927 | ||
1e55d29a EB |
4928 | p = defer_limited_with_list; |
4929 | defer_limited_with_list = NULL; | |
a1ab4c31 | 4930 | |
6ddf9843 | 4931 | for (; p; p = next) |
a1ab4c31 | 4932 | { |
6ddf9843 | 4933 | next = p->next; |
a1ab4c31 | 4934 | |
6ddf9843 | 4935 | if (p->old_type) |
1e55d29a EB |
4936 | { |
4937 | update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), | |
4938 | gnat_to_gnu_type (p->full_type)); | |
4939 | if (TYPE_DUMMY_IN_PROFILE_P (p->old_type)) | |
4940 | update_profiles_with (p->old_type); | |
4941 | } | |
4942 | ||
6ddf9843 | 4943 | free (p); |
a1ab4c31 AC |
4944 | } |
4945 | } | |
4946 | ||
b1b2b511 EB |
4947 | /* Return the equivalent type to be used for GNAT_ENTITY, if it's a kind |
4948 | of type (such E_Task_Type) that has a different type which Gigi uses | |
4949 | for its representation. If the type does not have a special type for | |
4950 | its representation, return GNAT_ENTITY. */ | |
a1ab4c31 AC |
4951 | |
4952 | Entity_Id | |
4953 | Gigi_Equivalent_Type (Entity_Id gnat_entity) | |
4954 | { | |
4955 | Entity_Id gnat_equiv = gnat_entity; | |
4956 | ||
4957 | if (No (gnat_entity)) | |
4958 | return gnat_entity; | |
4959 | ||
4960 | switch (Ekind (gnat_entity)) | |
4961 | { | |
4962 | case E_Class_Wide_Subtype: | |
4963 | if (Present (Equivalent_Type (gnat_entity))) | |
4964 | gnat_equiv = Equivalent_Type (gnat_entity); | |
4965 | break; | |
4966 | ||
4967 | case E_Access_Protected_Subprogram_Type: | |
4968 | case E_Anonymous_Access_Protected_Subprogram_Type: | |
42a5e410 EB |
4969 | if (Present (Equivalent_Type (gnat_entity))) |
4970 | gnat_equiv = Equivalent_Type (gnat_entity); | |
a1ab4c31 AC |
4971 | break; |
4972 | ||
4973 | case E_Class_Wide_Type: | |
cbae498b | 4974 | gnat_equiv = Root_Type (gnat_entity); |
a1ab4c31 AC |
4975 | break; |
4976 | ||
a1ab4c31 AC |
4977 | case E_Protected_Type: |
4978 | case E_Protected_Subtype: | |
42a5e410 EB |
4979 | case E_Task_Type: |
4980 | case E_Task_Subtype: | |
4981 | if (Present (Corresponding_Record_Type (gnat_entity))) | |
4982 | gnat_equiv = Corresponding_Record_Type (gnat_entity); | |
a1ab4c31 AC |
4983 | break; |
4984 | ||
4985 | default: | |
4986 | break; | |
4987 | } | |
4988 | ||
a1ab4c31 AC |
4989 | return gnat_equiv; |
4990 | } | |
4991 | ||
2cac6017 EB |
4992 | /* Return a GCC tree for a type corresponding to the component type of the |
4993 | array type or subtype GNAT_ARRAY. DEFINITION is true if this component | |
4994 | is for an array being defined. DEBUG_INFO_P is true if we need to write | |
4995 | debug information for other types that we may create in the process. */ | |
4996 | ||
4997 | static tree | |
4998 | gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition, | |
4999 | bool debug_info_p) | |
5000 | { | |
c020c92b EB |
5001 | const Entity_Id gnat_type = Component_Type (gnat_array); |
5002 | tree gnu_type = gnat_to_gnu_type (gnat_type); | |
2cac6017 | 5003 | tree gnu_comp_size; |
b3f75672 EB |
5004 | unsigned int max_align; |
5005 | ||
5006 | /* If an alignment is specified, use it as a cap on the component type | |
5007 | so that it can be honored for the whole type. But ignore it for the | |
5008 | original type of packed array types. */ | |
5009 | if (No (Packed_Array_Impl_Type (gnat_array)) | |
5010 | && Known_Alignment (gnat_array)) | |
5011 | max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0); | |
5012 | else | |
5013 | max_align = 0; | |
2cac6017 EB |
5014 | |
5015 | /* Try to get a smaller form of the component if needed. */ | |
afc737f0 | 5016 | if ((Is_Packed (gnat_array) || Has_Component_Size_Clause (gnat_array)) |
2cac6017 EB |
5017 | && !Is_Bit_Packed_Array (gnat_array) |
5018 | && !Has_Aliased_Components (gnat_array) | |
c020c92b | 5019 | && !Strict_Alignment (gnat_type) |
e1e5852c | 5020 | && RECORD_OR_UNION_TYPE_P (gnu_type) |
315cff15 | 5021 | && !TYPE_FAT_POINTER_P (gnu_type) |
cc269bb6 | 5022 | && tree_fits_uhwi_p (TYPE_SIZE (gnu_type))) |
b3f75672 | 5023 | gnu_type = make_packable_type (gnu_type, false, max_align); |
2cac6017 EB |
5024 | |
5025 | if (Has_Atomic_Components (gnat_array)) | |
86a8ba5b | 5026 | check_ok_for_atomic_type (gnu_type, gnat_array, true); |
2cac6017 EB |
5027 | |
5028 | /* Get and validate any specified Component_Size. */ | |
5029 | gnu_comp_size | |
5030 | = validate_size (Component_Size (gnat_array), gnu_type, gnat_array, | |
5031 | Is_Bit_Packed_Array (gnat_array) ? TYPE_DECL : VAR_DECL, | |
5032 | true, Has_Component_Size_Clause (gnat_array)); | |
5033 | ||
1aa8b1dd EB |
5034 | /* If the array has aliased components and the component size can be zero, |
5035 | force at least unit size to ensure that the components have distinct | |
5036 | addresses. */ | |
5037 | if (!gnu_comp_size | |
5038 | && Has_Aliased_Components (gnat_array) | |
5039 | && (integer_zerop (TYPE_SIZE (gnu_type)) | |
5040 | || (TREE_CODE (gnu_type) == ARRAY_TYPE | |
5041 | && !TREE_CONSTANT (TYPE_SIZE (gnu_type))))) | |
5042 | gnu_comp_size | |
5043 | = size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node); | |
5044 | ||
2cac6017 EB |
5045 | /* If the component type is a RECORD_TYPE that has a self-referential size, |
5046 | then use the maximum size for the component size. */ | |
5047 | if (!gnu_comp_size | |
5048 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
5049 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
5050 | gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true); | |
5051 | ||
5052 | /* Honor the component size. This is not needed for bit-packed arrays. */ | |
5053 | if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array)) | |
5054 | { | |
5055 | tree orig_type = gnu_type; | |
2cac6017 EB |
5056 | |
5057 | gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false); | |
5058 | if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align) | |
5059 | gnu_type = orig_type; | |
5060 | else | |
5061 | orig_type = gnu_type; | |
5062 | ||
5063 | gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array, | |
afb4afcd | 5064 | true, false, definition, true); |
2cac6017 EB |
5065 | |
5066 | /* If a padding record was made, declare it now since it will never be | |
5067 | declared otherwise. This is necessary to ensure that its subtrees | |
5068 | are properly marked. */ | |
5069 | if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) | |
74746d49 EB |
5070 | create_type_decl (TYPE_NAME (gnu_type), gnu_type, true, debug_info_p, |
5071 | gnat_array); | |
2cac6017 EB |
5072 | } |
5073 | ||
ee45a32d EB |
5074 | /* If the component type is a padded type made for a non-bit-packed array |
5075 | of scalars with reverse storage order, we need to propagate the reverse | |
5076 | storage order to the padding type since it is the innermost enclosing | |
5077 | aggregate type around the scalar. */ | |
5078 | if (TYPE_IS_PADDING_P (gnu_type) | |
5079 | && Reverse_Storage_Order (gnat_array) | |
5080 | && !Is_Bit_Packed_Array (gnat_array) | |
5081 | && Is_Scalar_Type (gnat_type)) | |
5082 | gnu_type = set_reverse_storage_order_on_pad_type (gnu_type); | |
5083 | ||
c020c92b | 5084 | if (Has_Volatile_Components (gnat_array)) |
f797c2b7 EB |
5085 | { |
5086 | const int quals | |
5087 | = TYPE_QUAL_VOLATILE | |
5088 | | (Has_Atomic_Components (gnat_array) ? TYPE_QUAL_ATOMIC : 0); | |
5089 | gnu_type = change_qualified_type (gnu_type, quals); | |
5090 | } | |
2cac6017 EB |
5091 | |
5092 | return gnu_type; | |
5093 | } | |
5094 | ||
1e55d29a | 5095 | /* Return a GCC tree for a parameter corresponding to GNAT_PARAM, to be placed |
d5ebeb8c EB |
5096 | in the parameter list of GNAT_SUBPROG. GNU_PARAM_TYPE is the GCC tree for |
5097 | the type of the parameter. FIRST is true if this is the first parameter in | |
5098 | the list of GNAT_SUBPROG. Also set CICO to true if the parameter must use | |
5099 | the copy-in copy-out implementation mechanism. | |
a1ab4c31 | 5100 | |
d5ebeb8c EB |
5101 | The returned tree is a PARM_DECL, except for the cases where no parameter |
5102 | needs to be actually passed to the subprogram; the type of this "shadow" | |
5103 | parameter is then returned instead. */ | |
a1ab4c31 AC |
5104 | |
5105 | static tree | |
d5ebeb8c EB |
5106 | gnat_to_gnu_param (Entity_Id gnat_param, tree gnu_param_type, bool first, |
5107 | Entity_Id gnat_subprog, bool *cico) | |
a1ab4c31 | 5108 | { |
1e55d29a EB |
5109 | Entity_Id gnat_param_type = Etype (gnat_param); |
5110 | Mechanism_Type mech = Mechanism (gnat_param); | |
a1ab4c31 | 5111 | tree gnu_param_name = get_entity_name (gnat_param); |
1e55d29a | 5112 | bool foreign = Has_Foreign_Convention (gnat_subprog); |
a1ab4c31 AC |
5113 | bool in_param = (Ekind (gnat_param) == E_In_Parameter); |
5114 | /* The parameter can be indirectly modified if its address is taken. */ | |
5115 | bool ro_param = in_param && !Address_Taken (gnat_param); | |
0c700259 | 5116 | bool by_return = false, by_component_ptr = false; |
491f54a7 | 5117 | bool by_ref = false; |
1ddde8dc | 5118 | bool restricted_aliasing_p = false; |
7414a3c3 | 5119 | location_t saved_location = input_location; |
a1ab4c31 AC |
5120 | tree gnu_param; |
5121 | ||
7414a3c3 EB |
5122 | /* Make sure to use the proper SLOC for vector ABI warnings. */ |
5123 | if (VECTOR_TYPE_P (gnu_param_type)) | |
5124 | Sloc_to_locus (Sloc (gnat_subprog), &input_location); | |
5125 | ||
1e55d29a EB |
5126 | /* Builtins are expanded inline and there is no real call sequence involved. |
5127 | So the type expected by the underlying expander is always the type of the | |
5128 | argument "as is". */ | |
5129 | if (Convention (gnat_subprog) == Convention_Intrinsic | |
5130 | && Present (Interface_Name (gnat_subprog))) | |
5131 | mech = By_Copy; | |
5132 | ||
5133 | /* Handle the first parameter of a valued procedure specially: it's a copy | |
5134 | mechanism for which the parameter is never allocated. */ | |
5135 | else if (first && Is_Valued_Procedure (gnat_subprog)) | |
a1ab4c31 AC |
5136 | { |
5137 | gcc_assert (Ekind (gnat_param) == E_Out_Parameter); | |
5138 | mech = By_Copy; | |
5139 | by_return = true; | |
5140 | } | |
5141 | ||
1e55d29a EB |
5142 | /* Or else, see if a Mechanism was supplied that forced this parameter |
5143 | to be passed one way or another. */ | |
5144 | else if (mech == Default || mech == By_Copy || mech == By_Reference) | |
5145 | ; | |
5146 | ||
5147 | /* Positive mechanism means by copy for sufficiently small parameters. */ | |
5148 | else if (mech > 0) | |
5149 | { | |
5150 | if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE | |
5151 | || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST | |
5152 | || compare_tree_int (TYPE_SIZE (gnu_param_type), mech) > 0) | |
5153 | mech = By_Reference; | |
5154 | else | |
5155 | mech = By_Copy; | |
5156 | } | |
5157 | ||
5158 | /* Otherwise, it's an unsupported mechanism so error out. */ | |
5159 | else | |
5160 | { | |
5161 | post_error ("unsupported mechanism for&", gnat_param); | |
5162 | mech = Default; | |
5163 | } | |
5164 | ||
a1ab4c31 | 5165 | /* If this is either a foreign function or if the underlying type won't |
57f4f0d5 EB |
5166 | be passed by reference and is as aligned as the original type, strip |
5167 | off possible padding type. */ | |
315cff15 | 5168 | if (TYPE_IS_PADDING_P (gnu_param_type)) |
a1ab4c31 AC |
5169 | { |
5170 | tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type)); | |
5171 | ||
57f4f0d5 | 5172 | if (foreign |
a1ab4c31 | 5173 | || (!must_pass_by_ref (unpadded_type) |
57f4f0d5 EB |
5174 | && mech != By_Reference |
5175 | && (mech == By_Copy || !default_pass_by_ref (unpadded_type)) | |
5176 | && TYPE_ALIGN (unpadded_type) >= TYPE_ALIGN (gnu_param_type))) | |
a1ab4c31 AC |
5177 | gnu_param_type = unpadded_type; |
5178 | } | |
5179 | ||
5180 | /* If this is a read-only parameter, make a variant of the type that is | |
41683e1a EB |
5181 | read-only. ??? However, if this is a self-referential type, the type |
5182 | can be very complex, so skip it for now. */ | |
5183 | if (ro_param && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type))) | |
4aecc2f8 | 5184 | gnu_param_type = change_qualified_type (gnu_param_type, TYPE_QUAL_CONST); |
a1ab4c31 AC |
5185 | |
5186 | /* For foreign conventions, pass arrays as pointers to the element type. | |
5187 | First check for unconstrained array and get the underlying array. */ | |
5188 | if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE) | |
5189 | gnu_param_type | |
5190 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type)))); | |
5191 | ||
a1ab4c31 | 5192 | /* Arrays are passed as pointers to element type for foreign conventions. */ |
1eb58520 | 5193 | if (foreign && mech != By_Copy && TREE_CODE (gnu_param_type) == ARRAY_TYPE) |
a1ab4c31 AC |
5194 | { |
5195 | /* Strip off any multi-dimensional entries, then strip | |
5196 | off the last array to get the component type. */ | |
5197 | while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE | |
5198 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type))) | |
5199 | gnu_param_type = TREE_TYPE (gnu_param_type); | |
5200 | ||
5201 | by_component_ptr = true; | |
5202 | gnu_param_type = TREE_TYPE (gnu_param_type); | |
5203 | ||
5204 | if (ro_param) | |
4aecc2f8 EB |
5205 | gnu_param_type |
5206 | = change_qualified_type (gnu_param_type, TYPE_QUAL_CONST); | |
a1ab4c31 AC |
5207 | |
5208 | gnu_param_type = build_pointer_type (gnu_param_type); | |
5209 | } | |
5210 | ||
5211 | /* Fat pointers are passed as thin pointers for foreign conventions. */ | |
315cff15 | 5212 | else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type)) |
a1ab4c31 AC |
5213 | gnu_param_type |
5214 | = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0); | |
5215 | ||
1e55d29a | 5216 | /* If we were requested or muss pass by reference, do so. |
a1ab4c31 AC |
5217 | If we were requested to pass by copy, do so. |
5218 | Otherwise, for foreign conventions, pass In Out or Out parameters | |
5219 | or aggregates by reference. For COBOL and Fortran, pass all | |
5220 | integer and FP types that way too. For Convention Ada, use | |
5221 | the standard Ada default. */ | |
1e55d29a EB |
5222 | else if (mech == By_Reference |
5223 | || must_pass_by_ref (gnu_param_type) | |
a1ab4c31 AC |
5224 | || (mech != By_Copy |
5225 | && ((foreign | |
5226 | && (!in_param || AGGREGATE_TYPE_P (gnu_param_type))) | |
5227 | || (foreign | |
5228 | && (Convention (gnat_subprog) == Convention_Fortran | |
5229 | || Convention (gnat_subprog) == Convention_COBOL) | |
5230 | && (INTEGRAL_TYPE_P (gnu_param_type) | |
5231 | || FLOAT_TYPE_P (gnu_param_type))) | |
5232 | || (!foreign | |
5233 | && default_pass_by_ref (gnu_param_type))))) | |
5234 | { | |
4f96985d EB |
5235 | /* We take advantage of 6.2(12) by considering that references built for |
5236 | parameters whose type isn't by-ref and for which the mechanism hasn't | |
1ddde8dc EB |
5237 | been forced to by-ref allow only a restricted form of aliasing. */ |
5238 | restricted_aliasing_p | |
a0b8b1b7 | 5239 | = !TYPE_IS_BY_REFERENCE_P (gnu_param_type) && mech != By_Reference; |
1e55d29a | 5240 | gnu_param_type = build_reference_type (gnu_param_type); |
a1ab4c31 AC |
5241 | by_ref = true; |
5242 | } | |
5243 | ||
5244 | /* Pass In Out or Out parameters using copy-in copy-out mechanism. */ | |
5245 | else if (!in_param) | |
5246 | *cico = true; | |
5247 | ||
7414a3c3 EB |
5248 | input_location = saved_location; |
5249 | ||
a1ab4c31 AC |
5250 | if (mech == By_Copy && (by_ref || by_component_ptr)) |
5251 | post_error ("?cannot pass & by copy", gnat_param); | |
5252 | ||
5253 | /* If this is an Out parameter that isn't passed by reference and isn't | |
5254 | a pointer or aggregate, we don't make a PARM_DECL for it. Instead, | |
5255 | it will be a VAR_DECL created when we process the procedure, so just | |
5256 | return its type. For the special parameter of a valued procedure, | |
5257 | never pass it in. | |
5258 | ||
5259 | An exception is made to cover the RM-6.4.1 rule requiring "by copy" | |
5260 | Out parameters with discriminants or implicit initial values to be | |
5261 | handled like In Out parameters. These type are normally built as | |
5262 | aggregates, hence passed by reference, except for some packed arrays | |
3a70ba74 RD |
5263 | which end up encoded in special integer types. Note that scalars can |
5264 | be given implicit initial values using the Default_Value aspect. | |
a1ab4c31 AC |
5265 | |
5266 | The exception we need to make is then for packed arrays of records | |
5267 | with discriminants or implicit initial values. We have no light/easy | |
5268 | way to check for the latter case, so we merely check for packed arrays | |
5269 | of records. This may lead to useless copy-in operations, but in very | |
5270 | rare cases only, as these would be exceptions in a set of already | |
5271 | exceptional situations. */ | |
5272 | if (Ekind (gnat_param) == E_Out_Parameter | |
5273 | && !by_ref | |
5274 | && (by_return | |
1eb58520 | 5275 | || (!POINTER_TYPE_P (gnu_param_type) |
3a70ba74 | 5276 | && !AGGREGATE_TYPE_P (gnu_param_type) |
1e55d29a EB |
5277 | && !Has_Default_Aspect (gnat_param_type))) |
5278 | && !(Is_Array_Type (gnat_param_type) | |
5279 | && Is_Packed (gnat_param_type) | |
5280 | && Is_Composite_Type (Component_Type (gnat_param_type)))) | |
a1ab4c31 AC |
5281 | return gnu_param_type; |
5282 | ||
1e55d29a EB |
5283 | gnu_param = create_param_decl (gnu_param_name, gnu_param_type); |
5284 | TREE_READONLY (gnu_param) = ro_param || by_ref || by_component_ptr; | |
a1ab4c31 AC |
5285 | DECL_BY_REF_P (gnu_param) = by_ref; |
5286 | DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr; | |
a1ab4c31 AC |
5287 | DECL_POINTS_TO_READONLY_P (gnu_param) |
5288 | = (ro_param && (by_ref || by_component_ptr)); | |
a1c7d797 | 5289 | DECL_CAN_NEVER_BE_NULL_P (gnu_param) = Can_Never_Be_Null (gnat_param); |
1ddde8dc | 5290 | DECL_RESTRICTED_ALIASING_P (gnu_param) = restricted_aliasing_p; |
1e55d29a | 5291 | Sloc_to_locus (Sloc (gnat_param), &DECL_SOURCE_LOCATION (gnu_param)); |
a1ab4c31 AC |
5292 | |
5293 | /* If no Mechanism was specified, indicate what we're using, then | |
5294 | back-annotate it. */ | |
5295 | if (mech == Default) | |
5296 | mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy; | |
5297 | ||
5298 | Set_Mechanism (gnat_param, mech); | |
5299 | return gnu_param; | |
5300 | } | |
5301 | ||
1e55d29a | 5302 | /* Associate GNAT_SUBPROG with GNU_TYPE, which must be a dummy type, so that |
d5ebeb8c | 5303 | GNAT_SUBPROG is updated when GNU_TYPE is completed. |
7414a3c3 EB |
5304 | |
5305 | Ada 2012 (AI05-019) says that freezing a subprogram does not always freeze | |
5306 | the corresponding profile, which means that, by the time the freeze node | |
5307 | of the subprogram is encountered, types involved in its profile may still | |
d5ebeb8c EB |
5308 | be not yet frozen. That's why we need to update GNAT_SUBPROG when we see |
5309 | the freeze node of types involved in its profile, either types of formal | |
5310 | parameters or the return type. */ | |
cb55aefb | 5311 | |
1e55d29a EB |
5312 | static void |
5313 | associate_subprog_with_dummy_type (Entity_Id gnat_subprog, tree gnu_type) | |
cb55aefb | 5314 | { |
1e55d29a | 5315 | gcc_assert (TYPE_IS_DUMMY_P (gnu_type)); |
cb55aefb | 5316 | |
1e55d29a EB |
5317 | struct tree_entity_vec_map in; |
5318 | in.base.from = gnu_type; | |
5319 | struct tree_entity_vec_map **slot | |
5320 | = dummy_to_subprog_map->find_slot (&in, INSERT); | |
5321 | if (!*slot) | |
cb55aefb | 5322 | { |
1e55d29a EB |
5323 | tree_entity_vec_map *e = ggc_alloc<tree_entity_vec_map> (); |
5324 | e->base.from = gnu_type; | |
5325 | e->to = NULL; | |
5326 | *slot = e; | |
1e55d29a | 5327 | } |
7414a3c3 EB |
5328 | |
5329 | /* Even if there is already a slot for GNU_TYPE, we need to set the flag | |
5330 | because the vector might have been just emptied by update_profiles_with. | |
5331 | This can happen when there are 2 freeze nodes associated with different | |
5332 | views of the same type; the type will be really complete only after the | |
5333 | second freeze node is encountered. */ | |
5334 | TYPE_DUMMY_IN_PROFILE_P (gnu_type) = 1; | |
5335 | ||
1e55d29a | 5336 | vec<Entity_Id, va_gc_atomic> *v = (*slot)->to; |
cb55aefb | 5337 | |
1e55d29a EB |
5338 | /* Make sure GNAT_SUBPROG is not associated twice with the same dummy type, |
5339 | since this would mean updating twice its profile. */ | |
5340 | if (v) | |
5341 | { | |
5342 | const unsigned len = v->length (); | |
5343 | unsigned int l = 0, u = len; | |
5344 | ||
5345 | /* Entity_Id is a simple integer so we can implement a stable order on | |
5346 | the vector with an ordered insertion scheme and binary search. */ | |
5347 | while (l < u) | |
5348 | { | |
5349 | unsigned int m = (l + u) / 2; | |
5350 | int diff = (int) (*v)[m] - (int) gnat_subprog; | |
5351 | if (diff > 0) | |
5352 | u = m; | |
5353 | else if (diff < 0) | |
5354 | l = m + 1; | |
5355 | else | |
5356 | return; | |
5357 | } | |
cb55aefb | 5358 | |
1e55d29a EB |
5359 | /* l == u and therefore is the insertion point. */ |
5360 | vec_safe_insert (v, l, gnat_subprog); | |
cb55aefb | 5361 | } |
1e55d29a EB |
5362 | else |
5363 | vec_safe_push (v, gnat_subprog); | |
cb55aefb | 5364 | |
1e55d29a EB |
5365 | (*slot)->to = v; |
5366 | } | |
5367 | ||
5368 | /* Update the GCC tree previously built for the profile of GNAT_SUBPROG. */ | |
5369 | ||
5370 | static void | |
5371 | update_profile (Entity_Id gnat_subprog) | |
5372 | { | |
5373 | tree gnu_param_list; | |
5374 | tree gnu_type = gnat_to_gnu_subprog_type (gnat_subprog, true, | |
5375 | Needs_Debug_Info (gnat_subprog), | |
5376 | &gnu_param_list); | |
7414a3c3 EB |
5377 | if (DECL_P (gnu_type)) |
5378 | { | |
5379 | /* Builtins cannot have their address taken so we can reset them. */ | |
5380 | gcc_assert (DECL_BUILT_IN (gnu_type)); | |
5381 | save_gnu_tree (gnat_subprog, NULL_TREE, false); | |
5382 | save_gnu_tree (gnat_subprog, gnu_type, false); | |
5383 | return; | |
5384 | } | |
5385 | ||
1e55d29a EB |
5386 | tree gnu_subprog = get_gnu_tree (gnat_subprog); |
5387 | ||
5388 | TREE_TYPE (gnu_subprog) = gnu_type; | |
5389 | ||
5390 | /* If GNAT_SUBPROG is an actual subprogram, GNU_SUBPROG is a FUNCTION_DECL | |
5391 | and needs to be adjusted too. */ | |
5392 | if (Ekind (gnat_subprog) != E_Subprogram_Type) | |
5393 | { | |
7414a3c3 EB |
5394 | tree gnu_entity_name = get_entity_name (gnat_subprog); |
5395 | tree gnu_ext_name | |
5396 | = gnu_ext_name_for_subprog (gnat_subprog, gnu_entity_name); | |
5397 | ||
1e55d29a | 5398 | DECL_ARGUMENTS (gnu_subprog) = gnu_param_list; |
7414a3c3 | 5399 | finish_subprog_decl (gnu_subprog, gnu_ext_name, gnu_type); |
1e55d29a EB |
5400 | } |
5401 | } | |
5402 | ||
5403 | /* Update the GCC trees previously built for the profiles involving GNU_TYPE, | |
5404 | a dummy type which appears in profiles. */ | |
5405 | ||
5406 | void | |
5407 | update_profiles_with (tree gnu_type) | |
5408 | { | |
5409 | struct tree_entity_vec_map in; | |
5410 | in.base.from = gnu_type; | |
5411 | struct tree_entity_vec_map *e = dummy_to_subprog_map->find (&in); | |
5412 | gcc_assert (e); | |
5413 | vec<Entity_Id, va_gc_atomic> *v = e->to; | |
5414 | e->to = NULL; | |
7414a3c3 EB |
5415 | |
5416 | /* The flag needs to be reset before calling update_profile, in case | |
5417 | associate_subprog_with_dummy_type is again invoked on GNU_TYPE. */ | |
1e55d29a EB |
5418 | TYPE_DUMMY_IN_PROFILE_P (gnu_type) = 0; |
5419 | ||
5420 | unsigned int i; | |
5421 | Entity_Id *iter; | |
5422 | FOR_EACH_VEC_ELT (*v, i, iter) | |
5423 | update_profile (*iter); | |
5424 | ||
5425 | vec_free (v); | |
5426 | } | |
5427 | ||
5428 | /* Return the GCC tree for GNAT_TYPE present in the profile of a subprogram. | |
5429 | ||
5430 | Ada 2012 (AI05-0151) says that incomplete types coming from a limited | |
5431 | context may now appear as parameter and result types. As a consequence, | |
5432 | we may need to defer their translation until after a freeze node is seen | |
5433 | or to the end of the current unit. We also aim at handling temporarily | |
5434 | incomplete types created by the usual delayed elaboration scheme. */ | |
5435 | ||
5436 | static tree | |
5437 | gnat_to_gnu_profile_type (Entity_Id gnat_type) | |
5438 | { | |
5439 | /* This is the same logic as the E_Access_Type case of gnat_to_gnu_entity | |
5440 | so the rationale is exposed in that place. These processings probably | |
5441 | ought to be merged at some point. */ | |
5442 | Entity_Id gnat_equiv = Gigi_Equivalent_Type (gnat_type); | |
5443 | const bool is_from_limited_with | |
7ed9919d | 5444 | = (Is_Incomplete_Type (gnat_equiv) |
1e55d29a EB |
5445 | && From_Limited_With (gnat_equiv)); |
5446 | Entity_Id gnat_full_direct_first | |
5447 | = (is_from_limited_with | |
5448 | ? Non_Limited_View (gnat_equiv) | |
7ed9919d | 5449 | : (Is_Incomplete_Or_Private_Type (gnat_equiv) |
1e55d29a EB |
5450 | ? Full_View (gnat_equiv) : Empty)); |
5451 | Entity_Id gnat_full_direct | |
5452 | = ((is_from_limited_with | |
5453 | && Present (gnat_full_direct_first) | |
7ed9919d | 5454 | && Is_Private_Type (gnat_full_direct_first)) |
1e55d29a EB |
5455 | ? Full_View (gnat_full_direct_first) |
5456 | : gnat_full_direct_first); | |
5457 | Entity_Id gnat_full = Gigi_Equivalent_Type (gnat_full_direct); | |
5458 | Entity_Id gnat_rep = Present (gnat_full) ? gnat_full : gnat_equiv; | |
5459 | const bool in_main_unit = In_Extended_Main_Code_Unit (gnat_rep); | |
5460 | tree gnu_type; | |
5461 | ||
5462 | if (Present (gnat_full) && present_gnu_tree (gnat_full)) | |
5463 | gnu_type = TREE_TYPE (get_gnu_tree (gnat_full)); | |
5464 | ||
5465 | else if (is_from_limited_with | |
5466 | && ((!in_main_unit | |
5467 | && !present_gnu_tree (gnat_equiv) | |
5468 | && Present (gnat_full) | |
d5ebeb8c EB |
5469 | && (Is_Record_Type (gnat_full) |
5470 | || Is_Array_Type (gnat_full) | |
5471 | || Is_Access_Type (gnat_full))) | |
1e55d29a EB |
5472 | || (in_main_unit && Present (Freeze_Node (gnat_rep))))) |
5473 | { | |
5474 | gnu_type = make_dummy_type (gnat_equiv); | |
5475 | ||
5476 | if (!in_main_unit) | |
5477 | { | |
5478 | struct incomplete *p = XNEW (struct incomplete); | |
5479 | ||
5480 | p->old_type = gnu_type; | |
5481 | p->full_type = gnat_equiv; | |
5482 | p->next = defer_limited_with_list; | |
5483 | defer_limited_with_list = p; | |
5484 | } | |
5485 | } | |
5486 | ||
5487 | else if (type_annotate_only && No (gnat_equiv)) | |
5488 | gnu_type = void_type_node; | |
5489 | ||
5490 | else | |
5491 | gnu_type = gnat_to_gnu_type (gnat_equiv); | |
5492 | ||
5493 | /* Access-to-unconstrained-array types need a special treatment. */ | |
5494 | if (Is_Array_Type (gnat_rep) && !Is_Constrained (gnat_rep)) | |
5495 | { | |
5496 | if (!TYPE_POINTER_TO (gnu_type)) | |
5497 | build_dummy_unc_pointer_types (gnat_equiv, gnu_type); | |
5498 | } | |
5499 | ||
5500 | return gnu_type; | |
5501 | } | |
5502 | ||
5503 | /* Return a GCC tree for a subprogram type corresponding to GNAT_SUBPROG. | |
5504 | DEFINITION is true if this is for a subprogram being defined. DEBUG_INFO_P | |
5505 | is true if we need to write debug information for other types that we may | |
7414a3c3 EB |
5506 | create in the process. Also set PARAM_LIST to the list of parameters. |
5507 | If GNAT_SUBPROG is bound to a GCC builtin, return the DECL for the builtin | |
5508 | directly instead of its type. */ | |
1e55d29a EB |
5509 | |
5510 | static tree | |
5511 | gnat_to_gnu_subprog_type (Entity_Id gnat_subprog, bool definition, | |
5512 | bool debug_info_p, tree *param_list) | |
5513 | { | |
5514 | const Entity_Kind kind = Ekind (gnat_subprog); | |
5515 | Entity_Id gnat_return_type = Etype (gnat_subprog); | |
5516 | Entity_Id gnat_param; | |
7414a3c3 EB |
5517 | tree gnu_type = present_gnu_tree (gnat_subprog) |
5518 | ? TREE_TYPE (get_gnu_tree (gnat_subprog)) : NULL_TREE; | |
1e55d29a EB |
5519 | tree gnu_return_type; |
5520 | tree gnu_param_type_list = NULL_TREE; | |
5521 | tree gnu_param_list = NULL_TREE; | |
5522 | /* Non-null for subprograms containing parameters passed by copy-in copy-out | |
5523 | (In Out or Out parameters not passed by reference), in which case it is | |
5524 | the list of nodes used to specify the values of the In Out/Out parameters | |
5525 | that are returned as a record upon procedure return. The TREE_PURPOSE of | |
5526 | an element of this list is a FIELD_DECL of the record and the TREE_VALUE | |
5527 | is the PARM_DECL corresponding to that field. This list will be saved in | |
5528 | the TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */ | |
5529 | tree gnu_cico_list = NULL_TREE; | |
7414a3c3 | 5530 | tree gnu_cico_return_type = NULL_TREE; |
1e55d29a EB |
5531 | /* Fields in return type of procedure with copy-in copy-out parameters. */ |
5532 | tree gnu_field_list = NULL_TREE; | |
5533 | /* The semantics of "pure" in Ada essentially matches that of "const" | |
5534 | in the back-end. In particular, both properties are orthogonal to | |
5535 | the "nothrow" property if the EH circuitry is explicit in the | |
5536 | internal representation of the back-end. If we are to completely | |
5537 | hide the EH circuitry from it, we need to declare that calls to pure | |
5538 | Ada subprograms that can throw have side effects since they can | |
5539 | trigger an "abnormal" transfer of control flow; thus they can be | |
5540 | neither "const" nor "pure" in the back-end sense. */ | |
5541 | bool const_flag = (Back_End_Exceptions () && Is_Pure (gnat_subprog)); | |
5542 | bool return_by_direct_ref_p = false; | |
5543 | bool return_by_invisi_ref_p = false; | |
5544 | bool return_unconstrained_p = false; | |
5545 | bool incomplete_profile_p = false; | |
5546 | unsigned int num; | |
5547 | ||
7414a3c3 EB |
5548 | /* Look into the return type and get its associated GCC tree if it is not |
5549 | void, and then compute various flags for the subprogram type. But make | |
5550 | sure not to do this processing multiple times. */ | |
1e55d29a EB |
5551 | if (Ekind (gnat_return_type) == E_Void) |
5552 | gnu_return_type = void_type_node; | |
7414a3c3 EB |
5553 | |
5554 | else if (gnu_type | |
5555 | && TREE_CODE (gnu_type) == FUNCTION_TYPE | |
5556 | && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_type))) | |
5557 | { | |
5558 | gnu_return_type = TREE_TYPE (gnu_type); | |
5559 | return_unconstrained_p = TYPE_RETURN_UNCONSTRAINED_P (gnu_type); | |
5560 | return_by_direct_ref_p = TYPE_RETURN_BY_DIRECT_REF_P (gnu_type); | |
5561 | return_by_invisi_ref_p = TREE_ADDRESSABLE (gnu_type); | |
5562 | } | |
5563 | ||
1e55d29a EB |
5564 | else |
5565 | { | |
f2e04c79 EB |
5566 | /* For foreign convention subprograms, return System.Address as void * |
5567 | or equivalent. Note that this comprises GCC builtins. */ | |
5568 | if (Has_Foreign_Convention (gnat_subprog) | |
a3fc8f16 | 5569 | && Is_Descendant_Of_Address (Underlying_Type (gnat_return_type))) |
9182f718 EB |
5570 | gnu_return_type = ptr_type_node; |
5571 | else | |
5572 | gnu_return_type = gnat_to_gnu_profile_type (gnat_return_type); | |
1e55d29a EB |
5573 | |
5574 | /* If this function returns by reference, make the actual return type | |
5575 | the reference type and make a note of that. */ | |
5576 | if (Returns_By_Ref (gnat_subprog)) | |
5577 | { | |
5578 | gnu_return_type = build_reference_type (gnu_return_type); | |
5579 | return_by_direct_ref_p = true; | |
5580 | } | |
5581 | ||
5582 | /* If the return type is an unconstrained array type, the return value | |
5583 | will be allocated on the secondary stack so the actual return type | |
5584 | is the fat pointer type. */ | |
5585 | else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE) | |
5586 | { | |
5587 | gnu_return_type = TYPE_REFERENCE_TO (gnu_return_type); | |
5588 | return_unconstrained_p = true; | |
5589 | } | |
5590 | ||
5591 | /* This is the same unconstrained array case, but for a dummy type. */ | |
5592 | else if (TYPE_REFERENCE_TO (gnu_return_type) | |
5593 | && TYPE_IS_FAT_POINTER_P (TYPE_REFERENCE_TO (gnu_return_type))) | |
5594 | { | |
5595 | gnu_return_type = TYPE_REFERENCE_TO (gnu_return_type); | |
5596 | return_unconstrained_p = true; | |
5597 | } | |
5598 | ||
5599 | /* Likewise, if the return type requires a transient scope, the return | |
5600 | value will also be allocated on the secondary stack so the actual | |
5601 | return type is the reference type. */ | |
5602 | else if (Requires_Transient_Scope (gnat_return_type)) | |
5603 | { | |
5604 | gnu_return_type = build_reference_type (gnu_return_type); | |
5605 | return_unconstrained_p = true; | |
5606 | } | |
5607 | ||
5608 | /* If the Mechanism is By_Reference, ensure this function uses the | |
5609 | target's by-invisible-reference mechanism, which may not be the | |
5610 | same as above (e.g. it might be passing an extra parameter). */ | |
5611 | else if (kind == E_Function && Mechanism (gnat_subprog) == By_Reference) | |
5612 | return_by_invisi_ref_p = true; | |
5613 | ||
5614 | /* Likewise, if the return type is itself By_Reference. */ | |
5615 | else if (TYPE_IS_BY_REFERENCE_P (gnu_return_type)) | |
5616 | return_by_invisi_ref_p = true; | |
5617 | ||
5618 | /* If the type is a padded type and the underlying type would not be | |
5619 | passed by reference or the function has a foreign convention, return | |
5620 | the underlying type. */ | |
5621 | else if (TYPE_IS_PADDING_P (gnu_return_type) | |
5622 | && (!default_pass_by_ref | |
5623 | (TREE_TYPE (TYPE_FIELDS (gnu_return_type))) | |
5624 | || Has_Foreign_Convention (gnat_subprog))) | |
5625 | gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type)); | |
5626 | ||
5627 | /* If the return type is unconstrained, it must have a maximum size. | |
5628 | Use the padded type as the effective return type. And ensure the | |
5629 | function uses the target's by-invisible-reference mechanism to | |
5630 | avoid copying too much data when it returns. */ | |
5631 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type))) | |
5632 | { | |
5633 | tree orig_type = gnu_return_type; | |
5634 | tree max_return_size = max_size (TYPE_SIZE (gnu_return_type), true); | |
5635 | ||
5636 | /* If the size overflows to 0, set it to an arbitrary positive | |
5637 | value so that assignments in the type are preserved. Their | |
5638 | actual size is independent of this positive value. */ | |
5639 | if (TREE_CODE (max_return_size) == INTEGER_CST | |
5640 | && TREE_OVERFLOW (max_return_size) | |
5641 | && integer_zerop (max_return_size)) | |
5642 | { | |
5643 | max_return_size = copy_node (bitsize_unit_node); | |
5644 | TREE_OVERFLOW (max_return_size) = 1; | |
5645 | } | |
5646 | ||
5647 | gnu_return_type = maybe_pad_type (gnu_return_type, max_return_size, | |
5648 | 0, gnat_subprog, false, false, | |
5649 | definition, true); | |
5650 | ||
5651 | /* Declare it now since it will never be declared otherwise. This | |
5652 | is necessary to ensure that its subtrees are properly marked. */ | |
5653 | if (gnu_return_type != orig_type | |
5654 | && !DECL_P (TYPE_NAME (gnu_return_type))) | |
5655 | create_type_decl (TYPE_NAME (gnu_return_type), gnu_return_type, | |
5656 | true, debug_info_p, gnat_subprog); | |
5657 | ||
5658 | return_by_invisi_ref_p = true; | |
5659 | } | |
5660 | ||
5661 | /* If the return type has a size that overflows, we usually cannot have | |
5662 | a function that returns that type. This usage doesn't really make | |
5663 | sense anyway, so issue an error here. */ | |
5664 | if (!return_by_invisi_ref_p | |
5665 | && TYPE_SIZE_UNIT (gnu_return_type) | |
5666 | && TREE_CODE (TYPE_SIZE_UNIT (gnu_return_type)) == INTEGER_CST | |
5667 | && !valid_constant_size_p (TYPE_SIZE_UNIT (gnu_return_type))) | |
5668 | { | |
5669 | post_error ("cannot return type whose size overflows", gnat_subprog); | |
5670 | gnu_return_type = copy_type (gnu_return_type); | |
5671 | TYPE_SIZE (gnu_return_type) = bitsize_zero_node; | |
5672 | TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node; | |
5673 | } | |
5674 | ||
5675 | /* If the return type is incomplete, there are 2 cases: if the function | |
5676 | returns by reference, then the return type is only linked indirectly | |
5677 | in the profile, so the profile can be seen as complete since it need | |
5678 | not be further modified, only the reference types need be adjusted; | |
7414a3c3 | 5679 | otherwise the profile is incomplete and need be adjusted too. */ |
1e55d29a EB |
5680 | if (TYPE_IS_DUMMY_P (gnu_return_type)) |
5681 | { | |
5682 | associate_subprog_with_dummy_type (gnat_subprog, gnu_return_type); | |
5683 | incomplete_profile_p = true; | |
5684 | } | |
5685 | ||
5686 | if (kind == E_Function) | |
5687 | Set_Mechanism (gnat_subprog, return_unconstrained_p | |
5688 | || return_by_direct_ref_p | |
5689 | || return_by_invisi_ref_p | |
5690 | ? By_Reference : By_Copy); | |
5691 | } | |
5692 | ||
5693 | /* A procedure (something that doesn't return anything) shouldn't be | |
5694 | considered const since there would be no reason for calling such a | |
5695 | subprogram. Note that procedures with Out (or In Out) parameters | |
5696 | have already been converted into a function with a return type. | |
5697 | Similarly, if the function returns an unconstrained type, then the | |
5698 | function will allocate the return value on the secondary stack and | |
5699 | thus calls to it cannot be CSE'ed, lest the stack be reclaimed. */ | |
5700 | if (TREE_CODE (gnu_return_type) == VOID_TYPE || return_unconstrained_p) | |
5701 | const_flag = false; | |
5702 | ||
5703 | /* Loop over the parameters and get their associated GCC tree. While doing | |
5704 | this, build a copy-in copy-out structure if we need one. */ | |
5705 | for (gnat_param = First_Formal_With_Extras (gnat_subprog), num = 0; | |
5706 | Present (gnat_param); | |
5707 | gnat_param = Next_Formal_With_Extras (gnat_param), num++) | |
5708 | { | |
7414a3c3 EB |
5709 | const bool mech_is_by_ref |
5710 | = Mechanism (gnat_param) == By_Reference | |
5711 | && !(num == 0 && Is_Valued_Procedure (gnat_subprog)); | |
1e55d29a | 5712 | tree gnu_param_name = get_entity_name (gnat_param); |
7414a3c3 | 5713 | tree gnu_param, gnu_param_type; |
1e55d29a EB |
5714 | bool cico = false; |
5715 | ||
7414a3c3 EB |
5716 | /* Fetch an existing parameter with complete type and reuse it. But we |
5717 | didn't save the CICO property so we can only do it for In parameters | |
5718 | or parameters passed by reference. */ | |
5719 | if ((Ekind (gnat_param) == E_In_Parameter || mech_is_by_ref) | |
5720 | && present_gnu_tree (gnat_param) | |
5721 | && (gnu_param = get_gnu_tree (gnat_param)) | |
5722 | && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_param))) | |
1e55d29a | 5723 | { |
7414a3c3 EB |
5724 | DECL_CHAIN (gnu_param) = NULL_TREE; |
5725 | gnu_param_type = TREE_TYPE (gnu_param); | |
5726 | } | |
1e55d29a | 5727 | |
7414a3c3 EB |
5728 | /* Otherwise translate the parameter type and act accordingly. */ |
5729 | else | |
5730 | { | |
5731 | Entity_Id gnat_param_type = Etype (gnat_param); | |
9182f718 | 5732 | |
f2e04c79 EB |
5733 | /* For foreign convention subprograms, pass System.Address as void * |
5734 | or equivalent. Note that this comprises GCC builtins. */ | |
5735 | if (Has_Foreign_Convention (gnat_subprog) | |
a3fc8f16 | 5736 | && Is_Descendant_Of_Address (Underlying_Type (gnat_param_type))) |
9182f718 EB |
5737 | gnu_param_type = ptr_type_node; |
5738 | else | |
5739 | gnu_param_type = gnat_to_gnu_profile_type (gnat_param_type); | |
7414a3c3 EB |
5740 | |
5741 | /* If the parameter type is incomplete, there are 2 cases: if it is | |
5742 | passed by reference, then the type is only linked indirectly in | |
5743 | the profile, so the profile can be seen as complete since it need | |
5744 | not be further modified, only the reference type need be adjusted; | |
5745 | otherwise the profile is incomplete and need be adjusted too. */ | |
5746 | if (TYPE_IS_DUMMY_P (gnu_param_type)) | |
1e55d29a | 5747 | { |
7414a3c3 | 5748 | Node_Id gnat_decl; |
1e55d29a | 5749 | |
7414a3c3 EB |
5750 | if (mech_is_by_ref |
5751 | || (TYPE_REFERENCE_TO (gnu_param_type) | |
5752 | && TYPE_IS_FAT_POINTER_P | |
5753 | (TYPE_REFERENCE_TO (gnu_param_type))) | |
5754 | || TYPE_IS_BY_REFERENCE_P (gnu_param_type)) | |
5755 | { | |
5756 | gnu_param_type = build_reference_type (gnu_param_type); | |
5757 | gnu_param | |
5758 | = create_param_decl (gnu_param_name, gnu_param_type); | |
5759 | TREE_READONLY (gnu_param) = 1; | |
5760 | DECL_BY_REF_P (gnu_param) = 1; | |
5761 | DECL_POINTS_TO_READONLY_P (gnu_param) | |
5762 | = (Ekind (gnat_param) == E_In_Parameter | |
5763 | && !Address_Taken (gnat_param)); | |
5764 | Set_Mechanism (gnat_param, By_Reference); | |
5765 | Sloc_to_locus (Sloc (gnat_param), | |
5766 | &DECL_SOURCE_LOCATION (gnu_param)); | |
5767 | } | |
1e55d29a | 5768 | |
7414a3c3 EB |
5769 | /* ??? This is a kludge to support null procedures in spec taking |
5770 | a parameter with an untagged incomplete type coming from a | |
5771 | limited context. The front-end creates a body without knowing | |
5772 | anything about the non-limited view, which is illegal Ada and | |
5773 | cannot be supported. Create a parameter with a fake type. */ | |
5774 | else if (kind == E_Procedure | |
5775 | && (gnat_decl = Parent (gnat_subprog)) | |
5776 | && Nkind (gnat_decl) == N_Procedure_Specification | |
5777 | && Null_Present (gnat_decl) | |
7ed9919d | 5778 | && Is_Incomplete_Type (gnat_param_type)) |
7414a3c3 | 5779 | gnu_param = create_param_decl (gnu_param_name, ptr_type_node); |
1e55d29a | 5780 | |
7414a3c3 EB |
5781 | else |
5782 | { | |
7cdb6871 EB |
5783 | /* Build a minimal PARM_DECL without DECL_ARG_TYPE so that |
5784 | Call_to_gnu will stop if it encounters the PARM_DECL. */ | |
7414a3c3 | 5785 | gnu_param |
7cdb6871 EB |
5786 | = build_decl (input_location, PARM_DECL, gnu_param_name, |
5787 | gnu_param_type); | |
7414a3c3 EB |
5788 | associate_subprog_with_dummy_type (gnat_subprog, |
5789 | gnu_param_type); | |
5790 | incomplete_profile_p = true; | |
5791 | } | |
5792 | } | |
1e55d29a | 5793 | |
7414a3c3 | 5794 | /* Otherwise build the parameter declaration normally. */ |
1e55d29a EB |
5795 | else |
5796 | { | |
7414a3c3 | 5797 | gnu_param |
d5ebeb8c EB |
5798 | = gnat_to_gnu_param (gnat_param, gnu_param_type, num == 0, |
5799 | gnat_subprog, &cico); | |
7414a3c3 EB |
5800 | |
5801 | /* We are returned either a PARM_DECL or a type if no parameter | |
5802 | needs to be passed; in either case, adjust the type. */ | |
5803 | if (DECL_P (gnu_param)) | |
5804 | gnu_param_type = TREE_TYPE (gnu_param); | |
5805 | else | |
5806 | { | |
5807 | gnu_param_type = gnu_param; | |
5808 | gnu_param = NULL_TREE; | |
5809 | } | |
1e55d29a EB |
5810 | } |
5811 | } | |
5812 | ||
7414a3c3 EB |
5813 | /* If we have a GCC tree for the parameter, register it. */ |
5814 | save_gnu_tree (gnat_param, NULL_TREE, false); | |
1e55d29a EB |
5815 | if (gnu_param) |
5816 | { | |
5817 | gnu_param_type_list | |
5818 | = tree_cons (NULL_TREE, gnu_param_type, gnu_param_type_list); | |
5819 | gnu_param_list = chainon (gnu_param, gnu_param_list); | |
1e55d29a EB |
5820 | save_gnu_tree (gnat_param, gnu_param, false); |
5821 | ||
5822 | /* If a parameter is a pointer, a function may modify memory through | |
5823 | it and thus shouldn't be considered a const function. Also, the | |
5824 | memory may be modified between two calls, so they can't be CSE'ed. | |
5825 | The latter case also handles by-ref parameters. */ | |
5826 | if (POINTER_TYPE_P (gnu_param_type) | |
5827 | || TYPE_IS_FAT_POINTER_P (gnu_param_type)) | |
5828 | const_flag = false; | |
5829 | } | |
5830 | ||
5831 | /* If the parameter uses the copy-in copy-out mechanism, allocate a field | |
5832 | for it in the return type and register the association. */ | |
5833 | if (cico && !incomplete_profile_p) | |
5834 | { | |
5835 | if (!gnu_cico_list) | |
5836 | { | |
7414a3c3 | 5837 | gnu_cico_return_type = make_node (RECORD_TYPE); |
1e55d29a EB |
5838 | |
5839 | /* If this is a function, we also need a field for the | |
5840 | return value to be placed. */ | |
7414a3c3 | 5841 | if (!VOID_TYPE_P (gnu_return_type)) |
1e55d29a | 5842 | { |
7414a3c3 | 5843 | tree gnu_field |
1e55d29a EB |
5844 | = create_field_decl (get_identifier ("RETVAL"), |
5845 | gnu_return_type, | |
7414a3c3 | 5846 | gnu_cico_return_type, NULL_TREE, |
1e55d29a EB |
5847 | NULL_TREE, 0, 0); |
5848 | Sloc_to_locus (Sloc (gnat_subprog), | |
5849 | &DECL_SOURCE_LOCATION (gnu_field)); | |
5850 | gnu_field_list = gnu_field; | |
5851 | gnu_cico_list | |
5852 | = tree_cons (gnu_field, void_type_node, NULL_TREE); | |
5853 | } | |
5854 | ||
7414a3c3 | 5855 | TYPE_NAME (gnu_cico_return_type) = get_identifier ("RETURN"); |
1e55d29a EB |
5856 | /* Set a default alignment to speed up accesses. But we should |
5857 | not increase the size of the structure too much, lest it does | |
5858 | not fit in return registers anymore. */ | |
7414a3c3 EB |
5859 | SET_TYPE_ALIGN (gnu_cico_return_type, |
5860 | get_mode_alignment (ptr_mode)); | |
1e55d29a EB |
5861 | } |
5862 | ||
7414a3c3 | 5863 | tree gnu_field |
1e55d29a | 5864 | = create_field_decl (gnu_param_name, gnu_param_type, |
7414a3c3 EB |
5865 | gnu_cico_return_type, NULL_TREE, NULL_TREE, |
5866 | 0, 0); | |
1e55d29a EB |
5867 | Sloc_to_locus (Sloc (gnat_param), |
5868 | &DECL_SOURCE_LOCATION (gnu_field)); | |
5869 | DECL_CHAIN (gnu_field) = gnu_field_list; | |
5870 | gnu_field_list = gnu_field; | |
5871 | gnu_cico_list = tree_cons (gnu_field, gnu_param, gnu_cico_list); | |
5872 | } | |
5873 | } | |
5874 | ||
5875 | /* If the subprogram uses the copy-in copy-out mechanism, possibly adjust | |
5876 | and finish up the return type. */ | |
5877 | if (gnu_cico_list && !incomplete_profile_p) | |
5878 | { | |
5879 | /* If we have a CICO list but it has only one entry, we convert | |
5880 | this function into a function that returns this object. */ | |
5881 | if (list_length (gnu_cico_list) == 1) | |
7414a3c3 | 5882 | gnu_cico_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list)); |
1e55d29a EB |
5883 | |
5884 | /* Do not finalize the return type if the subprogram is stubbed | |
5885 | since structures are incomplete for the back-end. */ | |
5886 | else if (Convention (gnat_subprog) != Convention_Stubbed) | |
5887 | { | |
7414a3c3 EB |
5888 | finish_record_type (gnu_cico_return_type, nreverse (gnu_field_list), |
5889 | 0, false); | |
1e55d29a EB |
5890 | |
5891 | /* Try to promote the mode of the return type if it is passed | |
5892 | in registers, again to speed up accesses. */ | |
7414a3c3 EB |
5893 | if (TYPE_MODE (gnu_cico_return_type) == BLKmode |
5894 | && !targetm.calls.return_in_memory (gnu_cico_return_type, | |
5895 | NULL_TREE)) | |
1e55d29a EB |
5896 | { |
5897 | unsigned int size | |
7414a3c3 | 5898 | = TREE_INT_CST_LOW (TYPE_SIZE (gnu_cico_return_type)); |
1e55d29a | 5899 | unsigned int i = BITS_PER_UNIT; |
fffbab82 | 5900 | scalar_int_mode mode; |
1e55d29a EB |
5901 | |
5902 | while (i < size) | |
5903 | i <<= 1; | |
fffbab82 | 5904 | if (int_mode_for_size (i, 0).exists (&mode)) |
1e55d29a | 5905 | { |
7414a3c3 EB |
5906 | SET_TYPE_MODE (gnu_cico_return_type, mode); |
5907 | SET_TYPE_ALIGN (gnu_cico_return_type, | |
5908 | GET_MODE_ALIGNMENT (mode)); | |
5909 | TYPE_SIZE (gnu_cico_return_type) | |
1e55d29a | 5910 | = bitsize_int (GET_MODE_BITSIZE (mode)); |
7414a3c3 | 5911 | TYPE_SIZE_UNIT (gnu_cico_return_type) |
1e55d29a EB |
5912 | = size_int (GET_MODE_SIZE (mode)); |
5913 | } | |
5914 | } | |
5915 | ||
5916 | if (debug_info_p) | |
7414a3c3 | 5917 | rest_of_record_type_compilation (gnu_cico_return_type); |
1e55d29a | 5918 | } |
7414a3c3 EB |
5919 | |
5920 | gnu_return_type = gnu_cico_return_type; | |
1e55d29a EB |
5921 | } |
5922 | ||
5923 | /* The lists have been built in reverse. */ | |
5924 | gnu_param_type_list = nreverse (gnu_param_type_list); | |
5925 | gnu_param_type_list = chainon (gnu_param_type_list, void_list_node); | |
5926 | *param_list = nreverse (gnu_param_list); | |
5927 | gnu_cico_list = nreverse (gnu_cico_list); | |
5928 | ||
5929 | /* If the profile is incomplete, we only set the (temporary) return and | |
5930 | parameter types; otherwise, we build the full type. In either case, | |
5931 | we reuse an already existing GCC tree that we built previously here. */ | |
1e55d29a EB |
5932 | if (incomplete_profile_p) |
5933 | { | |
5934 | if (gnu_type && TREE_CODE (gnu_type) == FUNCTION_TYPE) | |
5935 | ; | |
5936 | else | |
5937 | gnu_type = make_node (FUNCTION_TYPE); | |
5938 | TREE_TYPE (gnu_type) = gnu_return_type; | |
5939 | TYPE_ARG_TYPES (gnu_type) = gnu_param_type_list; | |
7414a3c3 EB |
5940 | TYPE_RETURN_UNCONSTRAINED_P (gnu_type) = return_unconstrained_p; |
5941 | TYPE_RETURN_BY_DIRECT_REF_P (gnu_type) = return_by_direct_ref_p; | |
5942 | TREE_ADDRESSABLE (gnu_type) = return_by_invisi_ref_p; | |
1e55d29a EB |
5943 | } |
5944 | else | |
5945 | { | |
5946 | if (gnu_type && TREE_CODE (gnu_type) == FUNCTION_TYPE) | |
5947 | { | |
5948 | TREE_TYPE (gnu_type) = gnu_return_type; | |
5949 | TYPE_ARG_TYPES (gnu_type) = gnu_param_type_list; | |
5950 | TYPE_CI_CO_LIST (gnu_type) = gnu_cico_list; | |
5951 | TYPE_RETURN_UNCONSTRAINED_P (gnu_type) = return_unconstrained_p; | |
5952 | TYPE_RETURN_BY_DIRECT_REF_P (gnu_type) = return_by_direct_ref_p; | |
5953 | TREE_ADDRESSABLE (gnu_type) = return_by_invisi_ref_p; | |
5954 | TYPE_CANONICAL (gnu_type) = gnu_type; | |
5955 | layout_type (gnu_type); | |
5956 | } | |
5957 | else | |
5958 | { | |
5959 | gnu_type | |
5960 | = build_function_type (gnu_return_type, gnu_param_type_list); | |
5961 | ||
5962 | /* GNU_TYPE may be shared since GCC hashes types. Unshare it if it | |
5963 | has a different TYPE_CI_CO_LIST or flags. */ | |
5964 | if (!fntype_same_flags_p (gnu_type, gnu_cico_list, | |
5965 | return_unconstrained_p, | |
5966 | return_by_direct_ref_p, | |
5967 | return_by_invisi_ref_p)) | |
5968 | { | |
5969 | gnu_type = copy_type (gnu_type); | |
5970 | TYPE_CI_CO_LIST (gnu_type) = gnu_cico_list; | |
5971 | TYPE_RETURN_UNCONSTRAINED_P (gnu_type) = return_unconstrained_p; | |
5972 | TYPE_RETURN_BY_DIRECT_REF_P (gnu_type) = return_by_direct_ref_p; | |
5973 | TREE_ADDRESSABLE (gnu_type) = return_by_invisi_ref_p; | |
5974 | } | |
5975 | } | |
5976 | ||
5977 | if (const_flag) | |
5978 | gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_CONST); | |
5979 | ||
5980 | if (No_Return (gnat_subprog)) | |
5981 | gnu_type = change_qualified_type (gnu_type, TYPE_QUAL_VOLATILE); | |
7414a3c3 EB |
5982 | |
5983 | /* If this subprogram is expectedly bound to a GCC builtin, fetch the | |
5984 | corresponding DECL node and check the parameter association. */ | |
5985 | if (Convention (gnat_subprog) == Convention_Intrinsic | |
5986 | && Present (Interface_Name (gnat_subprog))) | |
5987 | { | |
5988 | tree gnu_ext_name = create_concat_name (gnat_subprog, NULL); | |
5989 | tree gnu_builtin_decl = builtin_decl_for (gnu_ext_name); | |
5990 | ||
5991 | /* If we have a builtin DECL for that function, use it. Check if | |
5992 | the profiles are compatible and warn if they are not. Note that | |
5993 | the checker is expected to post diagnostics in this case. */ | |
5994 | if (gnu_builtin_decl) | |
5995 | { | |
5996 | intrin_binding_t inb | |
5997 | = { gnat_subprog, gnu_type, TREE_TYPE (gnu_builtin_decl) }; | |
5998 | ||
5999 | if (!intrin_profiles_compatible_p (&inb)) | |
6000 | post_error | |
6001 | ("?profile of& doesn''t match the builtin it binds!", | |
6002 | gnat_subprog); | |
6003 | ||
6004 | return gnu_builtin_decl; | |
6005 | } | |
6006 | ||
6007 | /* Inability to find the builtin DECL most often indicates a genuine | |
6008 | mistake, but imports of unregistered intrinsics are sometimes used | |
6009 | on purpose to allow hooking in alternate bodies; we post a warning | |
6010 | conditioned on Wshadow in this case, to let developers be notified | |
6011 | on demand without risking false positives with common default sets | |
6012 | of options. */ | |
6013 | if (warn_shadow) | |
6014 | post_error ("?gcc intrinsic not found for&!", gnat_subprog); | |
6015 | } | |
1e55d29a EB |
6016 | } |
6017 | ||
6018 | return gnu_type; | |
cb55aefb EB |
6019 | } |
6020 | ||
7414a3c3 EB |
6021 | /* Return the external name for GNAT_SUBPROG given its entity name. */ |
6022 | ||
6023 | static tree | |
6024 | gnu_ext_name_for_subprog (Entity_Id gnat_subprog, tree gnu_entity_name) | |
6025 | { | |
6026 | tree gnu_ext_name = create_concat_name (gnat_subprog, NULL); | |
6027 | ||
6028 | /* If there was no specified Interface_Name and the external and | |
6029 | internal names of the subprogram are the same, only use the | |
6030 | internal name to allow disambiguation of nested subprograms. */ | |
6031 | if (No (Interface_Name (gnat_subprog)) && gnu_ext_name == gnu_entity_name) | |
6032 | gnu_ext_name = NULL_TREE; | |
6033 | ||
6034 | return gnu_ext_name; | |
6035 | } | |
6036 | ||
4aecc2f8 EB |
6037 | /* Like build_qualified_type, but TYPE_QUALS is added to the existing |
6038 | qualifiers on TYPE. */ | |
6039 | ||
6040 | static tree | |
6041 | change_qualified_type (tree type, int type_quals) | |
6042 | { | |
41683e1a EB |
6043 | /* Qualifiers must be put on the associated array type. */ |
6044 | if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) | |
6045 | return type; | |
6046 | ||
4aecc2f8 EB |
6047 | return build_qualified_type (type, TYPE_QUALS (type) | type_quals); |
6048 | } | |
6049 | ||
d42b7559 EB |
6050 | /* Set TYPE_NONALIASED_COMPONENT on an array type built by means of |
6051 | build_nonshared_array_type. */ | |
6052 | ||
6053 | static void | |
6054 | set_nonaliased_component_on_array_type (tree type) | |
6055 | { | |
6056 | TYPE_NONALIASED_COMPONENT (type) = 1; | |
6057 | TYPE_NONALIASED_COMPONENT (TYPE_CANONICAL (type)) = 1; | |
6058 | } | |
6059 | ||
6060 | /* Set TYPE_REVERSE_STORAGE_ORDER on an array type built by means of | |
6061 | build_nonshared_array_type. */ | |
6062 | ||
6063 | static void | |
6064 | set_reverse_storage_order_on_array_type (tree type) | |
6065 | { | |
6066 | TYPE_REVERSE_STORAGE_ORDER (type) = 1; | |
6067 | TYPE_REVERSE_STORAGE_ORDER (TYPE_CANONICAL (type)) = 1; | |
6068 | } | |
6069 | ||
a1ab4c31 AC |
6070 | /* Return true if DISCR1 and DISCR2 represent the same discriminant. */ |
6071 | ||
6072 | static bool | |
6073 | same_discriminant_p (Entity_Id discr1, Entity_Id discr2) | |
6074 | { | |
6075 | while (Present (Corresponding_Discriminant (discr1))) | |
6076 | discr1 = Corresponding_Discriminant (discr1); | |
6077 | ||
6078 | while (Present (Corresponding_Discriminant (discr2))) | |
6079 | discr2 = Corresponding_Discriminant (discr2); | |
6080 | ||
6081 | return | |
6082 | Original_Record_Component (discr1) == Original_Record_Component (discr2); | |
6083 | } | |
6084 | ||
d8e94f79 EB |
6085 | /* Return true if the array type GNU_TYPE, which represents a dimension of |
6086 | GNAT_TYPE, has a non-aliased component in the back-end sense. */ | |
a1ab4c31 AC |
6087 | |
6088 | static bool | |
d8e94f79 | 6089 | array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type) |
a1ab4c31 | 6090 | { |
d8e94f79 EB |
6091 | /* If the array type is not the innermost dimension of the GNAT type, |
6092 | then it has a non-aliased component. */ | |
a1ab4c31 AC |
6093 | if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE |
6094 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) | |
6095 | return true; | |
6096 | ||
d8e94f79 EB |
6097 | /* If the array type has an aliased component in the front-end sense, |
6098 | then it also has an aliased component in the back-end sense. */ | |
a1ab4c31 AC |
6099 | if (Has_Aliased_Components (gnat_type)) |
6100 | return false; | |
6101 | ||
d8e94f79 EB |
6102 | /* If this is a derived type, then it has a non-aliased component if |
6103 | and only if its parent type also has one. */ | |
6104 | if (Is_Derived_Type (gnat_type)) | |
6105 | { | |
6106 | tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type)); | |
6107 | int index; | |
6108 | if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE) | |
6109 | gnu_parent_type | |
6110 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type)))); | |
6111 | for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--) | |
6112 | gnu_parent_type = TREE_TYPE (gnu_parent_type); | |
6113 | return TYPE_NONALIASED_COMPONENT (gnu_parent_type); | |
6114 | } | |
6115 | ||
6116 | /* Otherwise, rely exclusively on properties of the element type. */ | |
a1ab4c31 AC |
6117 | return type_for_nonaliased_component_p (TREE_TYPE (gnu_type)); |
6118 | } | |
229077b0 EB |
6119 | |
6120 | /* Return true if GNAT_ADDRESS is a value known at compile-time. */ | |
6121 | ||
6122 | static bool | |
6123 | compile_time_known_address_p (Node_Id gnat_address) | |
6124 | { | |
abb3ea16 TG |
6125 | /* Handle reference to a constant. */ |
6126 | if (Is_Entity_Name (gnat_address) | |
6127 | && Ekind (Entity (gnat_address)) == E_Constant) | |
6128 | { | |
6129 | gnat_address = Constant_Value (Entity (gnat_address)); | |
6130 | if (No (gnat_address)) | |
6131 | return false; | |
6132 | } | |
6133 | ||
229077b0 EB |
6134 | /* Catch System'To_Address. */ |
6135 | if (Nkind (gnat_address) == N_Unchecked_Type_Conversion) | |
6136 | gnat_address = Expression (gnat_address); | |
6137 | ||
6138 | return Compile_Time_Known_Value (gnat_address); | |
6139 | } | |
f45f9664 | 6140 | |
58c8f770 EB |
6141 | /* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e. if the |
6142 | inequality HB >= LB-1 is true. LB and HB are the low and high bounds. */ | |
f45f9664 EB |
6143 | |
6144 | static bool | |
fc7a823e | 6145 | cannot_be_superflat (Node_Id gnat_range) |
f45f9664 EB |
6146 | { |
6147 | Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range); | |
683ebd75 | 6148 | Node_Id scalar_range; |
1081f5a7 | 6149 | tree gnu_lb, gnu_hb, gnu_lb_minus_one; |
f45f9664 EB |
6150 | |
6151 | /* If the low bound is not constant, try to find an upper bound. */ | |
6152 | while (Nkind (gnat_lb) != N_Integer_Literal | |
6153 | && (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype | |
6154 | || Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype) | |
683ebd75 OH |
6155 | && (scalar_range = Scalar_Range (Etype (gnat_lb))) |
6156 | && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition | |
6157 | || Nkind (scalar_range) == N_Range)) | |
6158 | gnat_lb = High_Bound (scalar_range); | |
f45f9664 EB |
6159 | |
6160 | /* If the high bound is not constant, try to find a lower bound. */ | |
6161 | while (Nkind (gnat_hb) != N_Integer_Literal | |
6162 | && (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype | |
6163 | || Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype) | |
683ebd75 OH |
6164 | && (scalar_range = Scalar_Range (Etype (gnat_hb))) |
6165 | && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition | |
6166 | || Nkind (scalar_range) == N_Range)) | |
6167 | gnat_hb = Low_Bound (scalar_range); | |
f45f9664 | 6168 | |
1081f5a7 EB |
6169 | /* If we have failed to find constant bounds, punt. */ |
6170 | if (Nkind (gnat_lb) != N_Integer_Literal | |
6171 | || Nkind (gnat_hb) != N_Integer_Literal) | |
f45f9664 EB |
6172 | return false; |
6173 | ||
1081f5a7 EB |
6174 | /* We need at least a signed 64-bit type to catch most cases. */ |
6175 | gnu_lb = UI_To_gnu (Intval (gnat_lb), sbitsizetype); | |
6176 | gnu_hb = UI_To_gnu (Intval (gnat_hb), sbitsizetype); | |
6177 | if (TREE_OVERFLOW (gnu_lb) || TREE_OVERFLOW (gnu_hb)) | |
6178 | return false; | |
f45f9664 EB |
6179 | |
6180 | /* If the low bound is the smallest integer, nothing can be smaller. */ | |
1081f5a7 EB |
6181 | gnu_lb_minus_one = size_binop (MINUS_EXPR, gnu_lb, sbitsize_one_node); |
6182 | if (TREE_OVERFLOW (gnu_lb_minus_one)) | |
f45f9664 EB |
6183 | return true; |
6184 | ||
1081f5a7 | 6185 | return !tree_int_cst_lt (gnu_hb, gnu_lb_minus_one); |
f45f9664 | 6186 | } |
cb3d597d EB |
6187 | |
6188 | /* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */ | |
6189 | ||
6190 | static bool | |
6191 | constructor_address_p (tree gnu_expr) | |
6192 | { | |
6193 | while (TREE_CODE (gnu_expr) == NOP_EXPR | |
6194 | || TREE_CODE (gnu_expr) == CONVERT_EXPR | |
6195 | || TREE_CODE (gnu_expr) == NON_LVALUE_EXPR) | |
6196 | gnu_expr = TREE_OPERAND (gnu_expr, 0); | |
6197 | ||
6198 | return (TREE_CODE (gnu_expr) == ADDR_EXPR | |
6199 | && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR); | |
6200 | } | |
fc7a823e EB |
6201 | |
6202 | /* Return true if the size in units represented by GNU_SIZE can be handled by | |
6203 | an allocation. If STATIC_P is true, consider only what can be done with a | |
6204 | static allocation. */ | |
6205 | ||
6206 | static bool | |
6207 | allocatable_size_p (tree gnu_size, bool static_p) | |
6208 | { | |
6209 | /* We can allocate a fixed size if it is a valid for the middle-end. */ | |
6210 | if (TREE_CODE (gnu_size) == INTEGER_CST) | |
6211 | return valid_constant_size_p (gnu_size); | |
6212 | ||
6213 | /* We can allocate a variable size if this isn't a static allocation. */ | |
6214 | else | |
6215 | return !static_p; | |
6216 | } | |
6217 | ||
6218 | /* Return true if GNU_EXPR needs a conversion to GNU_TYPE when used as the | |
6219 | initial value of an object of GNU_TYPE. */ | |
6220 | ||
6221 | static bool | |
6222 | initial_value_needs_conversion (tree gnu_type, tree gnu_expr) | |
6223 | { | |
6224 | /* Do not convert if the object's type is unconstrained because this would | |
6225 | generate useless evaluations of the CONSTRUCTOR to compute the size. */ | |
6226 | if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE | |
6227 | || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
6228 | return false; | |
6229 | ||
6230 | /* Do not convert if the object's type is a padding record whose field is of | |
6231 | self-referential size because we want to copy only the actual data. */ | |
6232 | if (type_is_padding_self_referential (gnu_type)) | |
6233 | return false; | |
6234 | ||
6235 | /* Do not convert a call to a function that returns with variable size since | |
6236 | we want to use the return slot optimization in this case. */ | |
6237 | if (TREE_CODE (gnu_expr) == CALL_EXPR | |
6238 | && return_type_with_variable_size_p (TREE_TYPE (gnu_expr))) | |
6239 | return false; | |
6240 | ||
6241 | /* Do not convert to a record type with a variant part from a record type | |
6242 | without one, to keep the object simpler. */ | |
6243 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
6244 | && TREE_CODE (TREE_TYPE (gnu_expr)) == RECORD_TYPE | |
7c775aca EB |
6245 | && get_variant_part (gnu_type) |
6246 | && !get_variant_part (TREE_TYPE (gnu_expr))) | |
fc7a823e EB |
6247 | return false; |
6248 | ||
6249 | /* In all the other cases, convert the expression to the object's type. */ | |
6250 | return true; | |
6251 | } | |
a1ab4c31 AC |
6252 | \f |
6253 | /* Given GNAT_ENTITY, elaborate all expressions that are required to | |
6254 | be elaborated at the point of its definition, but do nothing else. */ | |
6255 | ||
6256 | void | |
6257 | elaborate_entity (Entity_Id gnat_entity) | |
6258 | { | |
6259 | switch (Ekind (gnat_entity)) | |
6260 | { | |
6261 | case E_Signed_Integer_Subtype: | |
6262 | case E_Modular_Integer_Subtype: | |
6263 | case E_Enumeration_Subtype: | |
6264 | case E_Ordinary_Fixed_Point_Subtype: | |
6265 | case E_Decimal_Fixed_Point_Subtype: | |
6266 | case E_Floating_Point_Subtype: | |
6267 | { | |
6268 | Node_Id gnat_lb = Type_Low_Bound (gnat_entity); | |
6269 | Node_Id gnat_hb = Type_High_Bound (gnat_entity); | |
6270 | ||
c1abd261 EB |
6271 | /* ??? Tests to avoid Constraint_Error in static expressions |
6272 | are needed until after the front stops generating bogus | |
6273 | conversions on bounds of real types. */ | |
a1ab4c31 | 6274 | if (!Raises_Constraint_Error (gnat_lb)) |
bf44701f EB |
6275 | elaborate_expression (gnat_lb, gnat_entity, "L", true, false, |
6276 | Needs_Debug_Info (gnat_entity)); | |
a1ab4c31 | 6277 | if (!Raises_Constraint_Error (gnat_hb)) |
bf44701f EB |
6278 | elaborate_expression (gnat_hb, gnat_entity, "U", true, false, |
6279 | Needs_Debug_Info (gnat_entity)); | |
a1ab4c31 AC |
6280 | break; |
6281 | } | |
6282 | ||
a1ab4c31 AC |
6283 | case E_Record_Subtype: |
6284 | case E_Private_Subtype: | |
6285 | case E_Limited_Private_Subtype: | |
6286 | case E_Record_Subtype_With_Private: | |
a8c4c75a | 6287 | if (Has_Discriminants (gnat_entity) && Is_Constrained (gnat_entity)) |
a1ab4c31 AC |
6288 | { |
6289 | Node_Id gnat_discriminant_expr; | |
6290 | Entity_Id gnat_field; | |
6291 | ||
8cd28148 EB |
6292 | for (gnat_field |
6293 | = First_Discriminant (Implementation_Base_Type (gnat_entity)), | |
a1ab4c31 AC |
6294 | gnat_discriminant_expr |
6295 | = First_Elmt (Discriminant_Constraint (gnat_entity)); | |
6296 | Present (gnat_field); | |
6297 | gnat_field = Next_Discriminant (gnat_field), | |
6298 | gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr)) | |
908ba941 | 6299 | /* Ignore access discriminants. */ |
a1ab4c31 AC |
6300 | if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr)))) |
6301 | elaborate_expression (Node (gnat_discriminant_expr), | |
bf44701f | 6302 | gnat_entity, get_entity_char (gnat_field), |
a531043b | 6303 | true, false, false); |
a1ab4c31 AC |
6304 | } |
6305 | break; | |
6306 | ||
6307 | } | |
6308 | } | |
6309 | \f | |
a1ab4c31 AC |
6310 | /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE, |
6311 | NAME, ARGS and ERROR_POINT. */ | |
6312 | ||
6313 | static void | |
0567ae8d | 6314 | prepend_one_attribute (struct attrib **attr_list, |
e0ef6912 | 6315 | enum attrib_type attrib_type, |
0567ae8d AC |
6316 | tree attr_name, |
6317 | tree attr_args, | |
6318 | Node_Id attr_error_point) | |
a1ab4c31 AC |
6319 | { |
6320 | struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib)); | |
6321 | ||
e0ef6912 | 6322 | attr->type = attrib_type; |
a1ab4c31 AC |
6323 | attr->name = attr_name; |
6324 | attr->args = attr_args; | |
6325 | attr->error_point = attr_error_point; | |
6326 | ||
6327 | attr->next = *attr_list; | |
6328 | *attr_list = attr; | |
6329 | } | |
6330 | ||
0567ae8d | 6331 | /* Prepend to ATTR_LIST an entry for an attribute provided by GNAT_PRAGMA. */ |
a1ab4c31 AC |
6332 | |
6333 | static void | |
0567ae8d | 6334 | prepend_one_attribute_pragma (struct attrib **attr_list, Node_Id gnat_pragma) |
a1ab4c31 | 6335 | { |
0567ae8d AC |
6336 | const Node_Id gnat_arg = Pragma_Argument_Associations (gnat_pragma); |
6337 | tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE; | |
e0ef6912 | 6338 | enum attrib_type etype; |
d81b4c61 | 6339 | |
0567ae8d AC |
6340 | /* Map the pragma at hand. Skip if this isn't one we know how to handle. */ |
6341 | switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_pragma)))) | |
6342 | { | |
6343 | case Pragma_Machine_Attribute: | |
6344 | etype = ATTR_MACHINE_ATTRIBUTE; | |
6345 | break; | |
a1ab4c31 | 6346 | |
0567ae8d AC |
6347 | case Pragma_Linker_Alias: |
6348 | etype = ATTR_LINK_ALIAS; | |
6349 | break; | |
a1ab4c31 | 6350 | |
0567ae8d AC |
6351 | case Pragma_Linker_Section: |
6352 | etype = ATTR_LINK_SECTION; | |
6353 | break; | |
a1ab4c31 | 6354 | |
0567ae8d AC |
6355 | case Pragma_Linker_Constructor: |
6356 | etype = ATTR_LINK_CONSTRUCTOR; | |
6357 | break; | |
a1ab4c31 | 6358 | |
0567ae8d AC |
6359 | case Pragma_Linker_Destructor: |
6360 | etype = ATTR_LINK_DESTRUCTOR; | |
6361 | break; | |
a1ab4c31 | 6362 | |
0567ae8d AC |
6363 | case Pragma_Weak_External: |
6364 | etype = ATTR_WEAK_EXTERNAL; | |
6365 | break; | |
a1ab4c31 | 6366 | |
0567ae8d AC |
6367 | case Pragma_Thread_Local_Storage: |
6368 | etype = ATTR_THREAD_LOCAL_STORAGE; | |
6369 | break; | |
a1ab4c31 | 6370 | |
0567ae8d AC |
6371 | default: |
6372 | return; | |
6373 | } | |
a1ab4c31 | 6374 | |
0567ae8d AC |
6375 | /* See what arguments we have and turn them into GCC trees for attribute |
6376 | handlers. These expect identifier for strings. We handle at most two | |
6377 | arguments and static expressions only. */ | |
6378 | if (Present (gnat_arg) && Present (First (gnat_arg))) | |
6379 | { | |
6380 | Node_Id gnat_arg0 = Next (First (gnat_arg)); | |
6381 | Node_Id gnat_arg1 = Empty; | |
40a14772 | 6382 | |
bd6a077a EB |
6383 | if (Present (gnat_arg0) |
6384 | && Is_OK_Static_Expression (Expression (gnat_arg0))) | |
0567ae8d AC |
6385 | { |
6386 | gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0)); | |
a1ab4c31 | 6387 | |
0567ae8d AC |
6388 | if (TREE_CODE (gnu_arg0) == STRING_CST) |
6389 | { | |
6390 | gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0)); | |
6391 | if (IDENTIFIER_LENGTH (gnu_arg0) == 0) | |
6392 | return; | |
6393 | } | |
d81b4c61 | 6394 | |
0567ae8d AC |
6395 | gnat_arg1 = Next (gnat_arg0); |
6396 | } | |
d81b4c61 | 6397 | |
bd6a077a EB |
6398 | if (Present (gnat_arg1) |
6399 | && Is_OK_Static_Expression (Expression (gnat_arg1))) | |
0567ae8d AC |
6400 | { |
6401 | gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1)); | |
d81b4c61 | 6402 | |
0567ae8d AC |
6403 | if (TREE_CODE (gnu_arg1) == STRING_CST) |
6404 | gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1)); | |
6405 | } | |
6406 | } | |
d81b4c61 | 6407 | |
0567ae8d AC |
6408 | /* Prepend to the list. Make a list of the argument we might have, as GCC |
6409 | expects it. */ | |
6410 | prepend_one_attribute (attr_list, etype, gnu_arg0, | |
6411 | gnu_arg1 | |
6412 | ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE, | |
6413 | Present (Next (First (gnat_arg))) | |
6414 | ? Expression (Next (First (gnat_arg))) : gnat_pragma); | |
6415 | } | |
d81b4c61 | 6416 | |
0567ae8d | 6417 | /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */ |
d81b4c61 | 6418 | |
0567ae8d AC |
6419 | static void |
6420 | prepend_attributes (struct attrib **attr_list, Entity_Id gnat_entity) | |
6421 | { | |
6422 | Node_Id gnat_temp; | |
a1ab4c31 | 6423 | |
0567ae8d AC |
6424 | /* Attributes are stored as Representation Item pragmas. */ |
6425 | for (gnat_temp = First_Rep_Item (gnat_entity); | |
6426 | Present (gnat_temp); | |
6427 | gnat_temp = Next_Rep_Item (gnat_temp)) | |
6428 | if (Nkind (gnat_temp) == N_Pragma) | |
6429 | prepend_one_attribute_pragma (attr_list, gnat_temp); | |
a1ab4c31 AC |
6430 | } |
6431 | \f | |
a1ab4c31 AC |
6432 | /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a |
6433 | type definition (either a bound or a discriminant value) for GNAT_ENTITY, | |
bf44701f | 6434 | return the GCC tree to use for that expression. S is the suffix to use |
241125b2 | 6435 | if a variable needs to be created and DEFINITION is true if this is done |
bf44701f | 6436 | for a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result; |
a531043b EB |
6437 | otherwise, we are just elaborating the expression for side-effects. If |
6438 | NEED_DEBUG is true, we need a variable for debugging purposes even if it | |
1e17ef87 | 6439 | isn't needed for code generation. */ |
a1ab4c31 AC |
6440 | |
6441 | static tree | |
bf44701f | 6442 | elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, const char *s, |
a531043b | 6443 | bool definition, bool need_value, bool need_debug) |
a1ab4c31 AC |
6444 | { |
6445 | tree gnu_expr; | |
6446 | ||
a531043b | 6447 | /* If we already elaborated this expression (e.g. it was involved |
a1ab4c31 AC |
6448 | in the definition of a private type), use the old value. */ |
6449 | if (present_gnu_tree (gnat_expr)) | |
6450 | return get_gnu_tree (gnat_expr); | |
6451 | ||
a531043b EB |
6452 | /* If we don't need a value and this is static or a discriminant, |
6453 | we don't need to do anything. */ | |
6454 | if (!need_value | |
6455 | && (Is_OK_Static_Expression (gnat_expr) | |
6456 | || (Nkind (gnat_expr) == N_Identifier | |
6457 | && Ekind (Entity (gnat_expr)) == E_Discriminant))) | |
6458 | return NULL_TREE; | |
6459 | ||
6460 | /* If it's a static expression, we don't need a variable for debugging. */ | |
6461 | if (need_debug && Is_OK_Static_Expression (gnat_expr)) | |
6462 | need_debug = false; | |
a1ab4c31 | 6463 | |
a531043b | 6464 | /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */ |
bf44701f EB |
6465 | gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity, s, |
6466 | definition, need_debug); | |
a1ab4c31 AC |
6467 | |
6468 | /* Save the expression in case we try to elaborate this entity again. Since | |
2ddc34ba | 6469 | it's not a DECL, don't check it. Don't save if it's a discriminant. */ |
a1ab4c31 AC |
6470 | if (!CONTAINS_PLACEHOLDER_P (gnu_expr)) |
6471 | save_gnu_tree (gnat_expr, gnu_expr, true); | |
6472 | ||
6473 | return need_value ? gnu_expr : error_mark_node; | |
6474 | } | |
6475 | ||
a531043b | 6476 | /* Similar, but take a GNU expression and always return a result. */ |
a1ab4c31 AC |
6477 | |
6478 | static tree | |
bf44701f | 6479 | elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, const char *s, |
a531043b | 6480 | bool definition, bool need_debug) |
a1ab4c31 | 6481 | { |
1586f8a3 EB |
6482 | const bool expr_public_p = Is_Public (gnat_entity); |
6483 | const bool expr_global_p = expr_public_p || global_bindings_p (); | |
646f9414 | 6484 | bool expr_variable_p, use_variable; |
a1ab4c31 | 6485 | |
f230d759 EB |
6486 | /* If GNU_EXPR contains a placeholder, just return it. We rely on the fact |
6487 | that an expression cannot contain both a discriminant and a variable. */ | |
6488 | if (CONTAINS_PLACEHOLDER_P (gnu_expr)) | |
6489 | return gnu_expr; | |
6490 | ||
6491 | /* If GNU_EXPR is neither a constant nor based on a read-only variable, make | |
6492 | a variable that is initialized to contain the expression when the package | |
6493 | containing the definition is elaborated. If this entity is defined at top | |
6494 | level, replace the expression by the variable; otherwise use a SAVE_EXPR | |
6495 | if this is necessary. */ | |
7194767c | 6496 | if (TREE_CONSTANT (gnu_expr)) |
f230d759 EB |
6497 | expr_variable_p = false; |
6498 | else | |
6499 | { | |
966b587e | 6500 | /* Skip any conversions and simple constant arithmetics to see if the |
7194767c | 6501 | expression is based on a read-only variable. */ |
966b587e EB |
6502 | tree inner = remove_conversions (gnu_expr, true); |
6503 | ||
6504 | inner = skip_simple_constant_arithmetic (inner); | |
f230d759 EB |
6505 | |
6506 | if (handled_component_p (inner)) | |
ea292448 | 6507 | inner = get_inner_constant_reference (inner); |
f230d759 EB |
6508 | |
6509 | expr_variable_p | |
6510 | = !(inner | |
6511 | && TREE_CODE (inner) == VAR_DECL | |
6512 | && (TREE_READONLY (inner) || DECL_READONLY_ONCE_ELAB (inner))); | |
6513 | } | |
a1ab4c31 | 6514 | |
646f9414 EB |
6515 | /* We only need to use the variable if we are in a global context since GCC |
6516 | can do the right thing in the local case. However, when not optimizing, | |
6517 | use it for bounds of loop iteration scheme to avoid code duplication. */ | |
6518 | use_variable = expr_variable_p | |
6519 | && (expr_global_p | |
6520 | || (!optimize | |
f563ce55 | 6521 | && definition |
646f9414 EB |
6522 | && Is_Itype (gnat_entity) |
6523 | && Nkind (Associated_Node_For_Itype (gnat_entity)) | |
6524 | == N_Loop_Parameter_Specification)); | |
6525 | ||
6526 | /* Now create it, possibly only for debugging purposes. */ | |
6527 | if (use_variable || need_debug) | |
bf7eefab | 6528 | { |
bf44701f EB |
6529 | /* The following variable creation can happen when processing the body |
6530 | of subprograms that are defined out of the extended main unit and | |
6531 | inlined. In this case, we are not at the global scope, and thus the | |
9a30c7c4 | 6532 | new variable must not be tagged "external", as we used to do here as |
bf44701f | 6533 | soon as DEFINITION was false. */ |
bf7eefab | 6534 | tree gnu_decl |
c1a569ef EB |
6535 | = create_var_decl (create_concat_name (gnat_entity, s), NULL_TREE, |
6536 | TREE_TYPE (gnu_expr), gnu_expr, true, | |
6537 | expr_public_p, !definition && expr_global_p, | |
2056c5ed EB |
6538 | expr_global_p, false, true, need_debug, |
6539 | NULL, gnat_entity); | |
9a30c7c4 AC |
6540 | |
6541 | /* Using this variable at debug time (if need_debug is true) requires a | |
6542 | proper location. The back-end will compute a location for this | |
6543 | variable only if the variable is used by the generated code. | |
6544 | Returning the variable ensures the caller will use it in generated | |
6545 | code. Note that there is no need for a location if the debug info | |
6546 | contains an integer constant. | |
ba464315 | 6547 | TODO: when the encoding-based debug scheme is dropped, move this |
9a30c7c4 AC |
6548 | condition to the top-level IF block: we will not need to create a |
6549 | variable anymore in such cases, then. */ | |
6550 | if (use_variable || (need_debug && !TREE_CONSTANT (gnu_expr))) | |
bf7eefab EB |
6551 | return gnu_decl; |
6552 | } | |
a531043b | 6553 | |
f230d759 | 6554 | return expr_variable_p ? gnat_save_expr (gnu_expr) : gnu_expr; |
a1ab4c31 | 6555 | } |
da01bfee EB |
6556 | |
6557 | /* Similar, but take an alignment factor and make it explicit in the tree. */ | |
6558 | ||
6559 | static tree | |
bf44701f | 6560 | elaborate_expression_2 (tree gnu_expr, Entity_Id gnat_entity, const char *s, |
da01bfee EB |
6561 | bool definition, bool need_debug, unsigned int align) |
6562 | { | |
6563 | tree unit_align = size_int (align / BITS_PER_UNIT); | |
6564 | return | |
6565 | size_binop (MULT_EXPR, | |
6566 | elaborate_expression_1 (size_binop (EXACT_DIV_EXPR, | |
6567 | gnu_expr, | |
6568 | unit_align), | |
bf44701f | 6569 | gnat_entity, s, definition, |
da01bfee EB |
6570 | need_debug), |
6571 | unit_align); | |
6572 | } | |
241125b2 EB |
6573 | |
6574 | /* Structure to hold internal data for elaborate_reference. */ | |
6575 | ||
6576 | struct er_data | |
6577 | { | |
6578 | Entity_Id entity; | |
6579 | bool definition; | |
fc7a823e | 6580 | unsigned int n; |
241125b2 EB |
6581 | }; |
6582 | ||
6583 | /* Wrapper function around elaborate_expression_1 for elaborate_reference. */ | |
6584 | ||
6585 | static tree | |
fc7a823e | 6586 | elaborate_reference_1 (tree ref, void *data) |
241125b2 EB |
6587 | { |
6588 | struct er_data *er = (struct er_data *)data; | |
6589 | char suffix[16]; | |
6590 | ||
6591 | /* This is what elaborate_expression_1 does if NEED_DEBUG is false. */ | |
6592 | if (TREE_CONSTANT (ref)) | |
6593 | return ref; | |
6594 | ||
6595 | /* If this is a COMPONENT_REF of a fat pointer, elaborate the entire fat | |
6596 | pointer. This may be more efficient, but will also allow us to more | |
6597 | easily find the match for the PLACEHOLDER_EXPR. */ | |
6598 | if (TREE_CODE (ref) == COMPONENT_REF | |
6599 | && TYPE_IS_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (ref, 0)))) | |
6600 | return build3 (COMPONENT_REF, TREE_TYPE (ref), | |
fc7a823e | 6601 | elaborate_reference_1 (TREE_OPERAND (ref, 0), data), |
552cc590 | 6602 | TREE_OPERAND (ref, 1), NULL_TREE); |
241125b2 | 6603 | |
fc7a823e | 6604 | sprintf (suffix, "EXP%d", ++er->n); |
241125b2 EB |
6605 | return |
6606 | elaborate_expression_1 (ref, er->entity, suffix, er->definition, false); | |
6607 | } | |
6608 | ||
6609 | /* Elaborate the reference REF to be used as renamed object for GNAT_ENTITY. | |
fc7a823e EB |
6610 | DEFINITION is true if this is done for a definition of GNAT_ENTITY and |
6611 | INIT is set to the first arm of a COMPOUND_EXPR present in REF, if any. */ | |
241125b2 EB |
6612 | |
6613 | static tree | |
fc7a823e EB |
6614 | elaborate_reference (tree ref, Entity_Id gnat_entity, bool definition, |
6615 | tree *init) | |
241125b2 | 6616 | { |
fc7a823e EB |
6617 | struct er_data er = { gnat_entity, definition, 0 }; |
6618 | return gnat_rewrite_reference (ref, elaborate_reference_1, &er, init); | |
241125b2 | 6619 | } |
a1ab4c31 | 6620 | \f |
a1ab4c31 AC |
6621 | /* Given a GNU tree and a GNAT list of choices, generate an expression to test |
6622 | the value passed against the list of choices. */ | |
6623 | ||
08ef2c16 | 6624 | static tree |
a1ab4c31 AC |
6625 | choices_to_gnu (tree operand, Node_Id choices) |
6626 | { | |
6627 | Node_Id choice; | |
6628 | Node_Id gnat_temp; | |
bf6490b5 | 6629 | tree result = boolean_false_node; |
a1ab4c31 AC |
6630 | tree this_test, low = 0, high = 0, single = 0; |
6631 | ||
6632 | for (choice = First (choices); Present (choice); choice = Next (choice)) | |
6633 | { | |
6634 | switch (Nkind (choice)) | |
6635 | { | |
6636 | case N_Range: | |
6637 | low = gnat_to_gnu (Low_Bound (choice)); | |
6638 | high = gnat_to_gnu (High_Bound (choice)); | |
6639 | ||
a1ab4c31 | 6640 | this_test |
1139f2e8 EB |
6641 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6642 | build_binary_op (GE_EXPR, boolean_type_node, | |
08ef2c16 | 6643 | operand, low, true), |
1139f2e8 | 6644 | build_binary_op (LE_EXPR, boolean_type_node, |
08ef2c16 PMR |
6645 | operand, high, true), |
6646 | true); | |
a1ab4c31 AC |
6647 | |
6648 | break; | |
6649 | ||
6650 | case N_Subtype_Indication: | |
6651 | gnat_temp = Range_Expression (Constraint (choice)); | |
6652 | low = gnat_to_gnu (Low_Bound (gnat_temp)); | |
6653 | high = gnat_to_gnu (High_Bound (gnat_temp)); | |
6654 | ||
6655 | this_test | |
1139f2e8 EB |
6656 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6657 | build_binary_op (GE_EXPR, boolean_type_node, | |
08ef2c16 | 6658 | operand, low, true), |
1139f2e8 | 6659 | build_binary_op (LE_EXPR, boolean_type_node, |
08ef2c16 PMR |
6660 | operand, high, true), |
6661 | true); | |
a1ab4c31 AC |
6662 | break; |
6663 | ||
6664 | case N_Identifier: | |
6665 | case N_Expanded_Name: | |
6666 | /* This represents either a subtype range, an enumeration | |
6667 | literal, or a constant Ekind says which. If an enumeration | |
6668 | literal or constant, fall through to the next case. */ | |
6669 | if (Ekind (Entity (choice)) != E_Enumeration_Literal | |
6670 | && Ekind (Entity (choice)) != E_Constant) | |
6671 | { | |
6672 | tree type = gnat_to_gnu_type (Entity (choice)); | |
6673 | ||
6674 | low = TYPE_MIN_VALUE (type); | |
6675 | high = TYPE_MAX_VALUE (type); | |
6676 | ||
6677 | this_test | |
1139f2e8 EB |
6678 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6679 | build_binary_op (GE_EXPR, boolean_type_node, | |
08ef2c16 | 6680 | operand, low, true), |
1139f2e8 | 6681 | build_binary_op (LE_EXPR, boolean_type_node, |
08ef2c16 PMR |
6682 | operand, high, true), |
6683 | true); | |
a1ab4c31 AC |
6684 | break; |
6685 | } | |
2ddc34ba | 6686 | |
9c453de7 | 6687 | /* ... fall through ... */ |
2ddc34ba | 6688 | |
a1ab4c31 AC |
6689 | case N_Character_Literal: |
6690 | case N_Integer_Literal: | |
6691 | single = gnat_to_gnu (choice); | |
1139f2e8 | 6692 | this_test = build_binary_op (EQ_EXPR, boolean_type_node, operand, |
08ef2c16 | 6693 | single, true); |
a1ab4c31 AC |
6694 | break; |
6695 | ||
6696 | case N_Others_Choice: | |
bf6490b5 | 6697 | this_test = boolean_true_node; |
a1ab4c31 AC |
6698 | break; |
6699 | ||
6700 | default: | |
6701 | gcc_unreachable (); | |
6702 | } | |
6703 | ||
08ef2c16 PMR |
6704 | if (result == boolean_false_node) |
6705 | result = this_test; | |
6706 | else | |
6707 | result = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, result, | |
6708 | this_test, true); | |
a1ab4c31 AC |
6709 | } |
6710 | ||
6711 | return result; | |
6712 | } | |
6713 | \f | |
6714 | /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of | |
6715 | type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */ | |
6716 | ||
6717 | static int | |
6718 | adjust_packed (tree field_type, tree record_type, int packed) | |
6719 | { | |
6720 | /* If the field contains an item of variable size, we cannot pack it | |
6721 | because we cannot create temporaries of non-fixed size in case | |
6722 | we need to take the address of the field. See addressable_p and | |
6723 | the notes on the addressability issues for further details. */ | |
5f2e59d4 | 6724 | if (type_has_variable_size (field_type)) |
a1ab4c31 AC |
6725 | return 0; |
6726 | ||
14ecca2e EB |
6727 | /* In the other cases, we can honor the packing. */ |
6728 | if (packed) | |
6729 | return packed; | |
6730 | ||
a1ab4c31 AC |
6731 | /* If the alignment of the record is specified and the field type |
6732 | is over-aligned, request Storage_Unit alignment for the field. */ | |
14ecca2e EB |
6733 | if (TYPE_ALIGN (record_type) |
6734 | && TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type)) | |
6735 | return -1; | |
6736 | ||
6737 | /* Likewise if the maximum alignment of the record is specified. */ | |
6738 | if (TYPE_MAX_ALIGN (record_type) | |
6739 | && TYPE_ALIGN (field_type) > TYPE_MAX_ALIGN (record_type)) | |
6740 | return -1; | |
a1ab4c31 | 6741 | |
14ecca2e | 6742 | return 0; |
a1ab4c31 AC |
6743 | } |
6744 | ||
6745 | /* Return a GCC tree for a field corresponding to GNAT_FIELD to be | |
6746 | placed in GNU_RECORD_TYPE. | |
6747 | ||
14ecca2e EB |
6748 | PACKED is 1 if the enclosing record is packed or -1 if the enclosing |
6749 | record has Component_Alignment of Storage_Unit. | |
a1ab4c31 | 6750 | |
839f2864 EB |
6751 | DEFINITION is true if this field is for a record being defined. |
6752 | ||
6753 | DEBUG_INFO_P is true if we need to write debug information for types | |
6754 | that we may create in the process. */ | |
a1ab4c31 AC |
6755 | |
6756 | static tree | |
6757 | gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed, | |
839f2864 | 6758 | bool definition, bool debug_info_p) |
a1ab4c31 | 6759 | { |
741bd9b1 | 6760 | const Entity_Id gnat_record_type = Underlying_Type (Scope (gnat_field)); |
c020c92b | 6761 | const Entity_Id gnat_field_type = Etype (gnat_field); |
07aff4e3 | 6762 | const bool is_atomic |
f797c2b7 | 6763 | = (Is_Atomic_Or_VFA (gnat_field) || Is_Atomic_Or_VFA (gnat_field_type)); |
4c24ec6d | 6764 | const bool is_aliased = Is_Aliased (gnat_field); |
07aff4e3 AC |
6765 | const bool is_independent |
6766 | = (Is_Independent (gnat_field) || Is_Independent (gnat_field_type)); | |
6767 | const bool is_volatile | |
c020c92b | 6768 | = (Treat_As_Volatile (gnat_field) || Treat_As_Volatile (gnat_field_type)); |
4c24ec6d EB |
6769 | const bool is_strict_alignment = Strict_Alignment (gnat_field_type); |
6770 | /* We used to consider that volatile fields also require strict alignment, | |
6771 | but that was an interpolation and would cause us to reject a pragma | |
6772 | volatile on a packed record type containing boolean components, while | |
6773 | there is no basis to do so in the RM. In such cases, the writes will | |
6774 | involve load-modify-store sequences, but that's OK for volatile. The | |
6775 | only constraint is the implementation advice whereby only the bits of | |
6776 | the components should be accessed if they both start and end on byte | |
6777 | boundaries, but that should be guaranteed by the GCC memory model. */ | |
07aff4e3 | 6778 | const bool needs_strict_alignment |
4c24ec6d | 6779 | = (is_atomic || is_aliased || is_independent || is_strict_alignment); |
07aff4e3 AC |
6780 | tree gnu_field_type = gnat_to_gnu_type (gnat_field_type); |
6781 | tree gnu_field_id = get_entity_name (gnat_field); | |
6782 | tree gnu_field, gnu_size, gnu_pos; | |
a1ab4c31 AC |
6783 | |
6784 | /* If this field requires strict alignment, we cannot pack it because | |
6785 | it would very likely be under-aligned in the record. */ | |
6786 | if (needs_strict_alignment) | |
6787 | packed = 0; | |
6788 | else | |
6789 | packed = adjust_packed (gnu_field_type, gnu_record_type, packed); | |
6790 | ||
6791 | /* If a size is specified, use it. Otherwise, if the record type is packed, | |
6792 | use the official RM size. See "Handling of Type'Size Values" in Einfo | |
6793 | for further details. */ | |
fc893455 | 6794 | if (Known_Esize (gnat_field)) |
a1ab4c31 AC |
6795 | gnu_size = validate_size (Esize (gnat_field), gnu_field_type, |
6796 | gnat_field, FIELD_DECL, false, true); | |
6797 | else if (packed == 1) | |
c020c92b | 6798 | gnu_size = validate_size (RM_Size (gnat_field_type), gnu_field_type, |
a1ab4c31 AC |
6799 | gnat_field, FIELD_DECL, false, true); |
6800 | else | |
6801 | gnu_size = NULL_TREE; | |
6802 | ||
d770e88d EB |
6803 | /* If we have a specified size that is smaller than that of the field's type, |
6804 | or a position is specified, and the field's type is a record that doesn't | |
6805 | require strict alignment, see if we can get either an integral mode form | |
6806 | of the type or a smaller form. If we can, show a size was specified for | |
6807 | the field if there wasn't one already, so we know to make this a bitfield | |
6808 | and avoid making things wider. | |
a1ab4c31 | 6809 | |
d770e88d EB |
6810 | Changing to an integral mode form is useful when the record is packed as |
6811 | we can then place the field at a non-byte-aligned position and so achieve | |
6812 | tighter packing. This is in addition required if the field shares a byte | |
6813 | with another field and the front-end lets the back-end handle the access | |
6814 | to the field, because GCC cannot handle non-byte-aligned BLKmode fields. | |
a1ab4c31 | 6815 | |
d770e88d EB |
6816 | Changing to a smaller form is required if the specified size is smaller |
6817 | than that of the field's type and the type contains sub-fields that are | |
6818 | padded, in order to avoid generating accesses to these sub-fields that | |
6819 | are wider than the field. | |
a1ab4c31 AC |
6820 | |
6821 | We avoid the transformation if it is not required or potentially useful, | |
6822 | as it might entail an increase of the field's alignment and have ripple | |
6823 | effects on the outer record type. A typical case is a field known to be | |
d770e88d EB |
6824 | byte-aligned and not to share a byte with another field. */ |
6825 | if (!needs_strict_alignment | |
e1e5852c | 6826 | && RECORD_OR_UNION_TYPE_P (gnu_field_type) |
315cff15 | 6827 | && !TYPE_FAT_POINTER_P (gnu_field_type) |
cc269bb6 | 6828 | && tree_fits_uhwi_p (TYPE_SIZE (gnu_field_type)) |
a1ab4c31 AC |
6829 | && (packed == 1 |
6830 | || (gnu_size | |
6831 | && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type)) | |
d770e88d EB |
6832 | || (Present (Component_Clause (gnat_field)) |
6833 | && !(UI_To_Int (Component_Bit_Offset (gnat_field)) | |
6834 | % BITS_PER_UNIT == 0 | |
6835 | && value_factor_p (gnu_size, BITS_PER_UNIT))))))) | |
a1ab4c31 | 6836 | { |
a1ab4c31 | 6837 | tree gnu_packable_type = make_packable_type (gnu_field_type, true); |
d770e88d | 6838 | if (gnu_packable_type != gnu_field_type) |
a1ab4c31 AC |
6839 | { |
6840 | gnu_field_type = gnu_packable_type; | |
a1ab4c31 AC |
6841 | if (!gnu_size) |
6842 | gnu_size = rm_size (gnu_field_type); | |
6843 | } | |
6844 | } | |
6845 | ||
f797c2b7 | 6846 | if (Is_Atomic_Or_VFA (gnat_field)) |
89ec98ed EB |
6847 | { |
6848 | const unsigned int align | |
6849 | = promote_object_alignment (gnu_field_type, gnat_field); | |
6850 | if (align > 0) | |
6851 | gnu_field_type | |
6852 | = maybe_pad_type (gnu_field_type, NULL_TREE, align, gnat_field, | |
6853 | false, false, definition, true); | |
6854 | check_ok_for_atomic_type (gnu_field_type, gnat_field, false); | |
6855 | } | |
a1ab4c31 AC |
6856 | |
6857 | if (Present (Component_Clause (gnat_field))) | |
6858 | { | |
35786aad | 6859 | Node_Id gnat_clause = Component_Clause (gnat_field); |
741bd9b1 | 6860 | Entity_Id gnat_parent = Parent_Subtype (gnat_record_type); |
ec88784d | 6861 | |
a1ab4c31 AC |
6862 | gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype); |
6863 | gnu_size = validate_size (Esize (gnat_field), gnu_field_type, | |
6864 | gnat_field, FIELD_DECL, false, true); | |
6865 | ||
ec88784d AC |
6866 | /* Ensure the position does not overlap with the parent subtype, if there |
6867 | is one. This test is omitted if the parent of the tagged type has a | |
6868 | full rep clause since, in this case, component clauses are allowed to | |
6869 | overlay the space allocated for the parent type and the front-end has | |
6870 | checked that there are no overlapping components. */ | |
6871 | if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent)) | |
a1ab4c31 | 6872 | { |
ec88784d | 6873 | tree gnu_parent = gnat_to_gnu_type (gnat_parent); |
a1ab4c31 AC |
6874 | |
6875 | if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST | |
6876 | && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent))) | |
35786aad EB |
6877 | post_error_ne_tree |
6878 | ("offset of& must be beyond parent{, minimum allowed is ^}", | |
6879 | Position (gnat_clause), gnat_field, TYPE_SIZE_UNIT (gnu_parent)); | |
a1ab4c31 AC |
6880 | } |
6881 | ||
35786aad EB |
6882 | /* If this field needs strict alignment, make sure that the record is |
6883 | sufficiently aligned and that the position and size are consistent | |
6884 | with the type. But don't do it if we are just annotating types and | |
bd95368b OH |
6885 | the field's type is tagged, since tagged types aren't fully laid out |
6886 | in this mode. Also, note that atomic implies volatile so the inner | |
6887 | test sequences ordering is significant here. */ | |
b38086f0 EB |
6888 | if (needs_strict_alignment |
6889 | && !(type_annotate_only && Is_Tagged_Type (gnat_field_type))) | |
a1ab4c31 | 6890 | { |
35786aad EB |
6891 | const unsigned int type_align = TYPE_ALIGN (gnu_field_type); |
6892 | ||
9df60a5d EB |
6893 | if (TYPE_ALIGN (gnu_record_type) |
6894 | && TYPE_ALIGN (gnu_record_type) < type_align) | |
fe37c7af | 6895 | SET_TYPE_ALIGN (gnu_record_type, type_align); |
a1ab4c31 | 6896 | |
35786aad EB |
6897 | /* If the position is not a multiple of the alignment of the type, |
6898 | then error out and reset the position. */ | |
6899 | if (!integer_zerop (size_binop (TRUNC_MOD_EXPR, gnu_pos, | |
6900 | bitsize_int (type_align)))) | |
a1ab4c31 | 6901 | { |
35786aad | 6902 | const char *s; |
a1ab4c31 | 6903 | |
35786aad EB |
6904 | if (is_atomic) |
6905 | s = "position of atomic field& must be multiple of ^ bits"; | |
6906 | else if (is_aliased) | |
6907 | s = "position of aliased field& must be multiple of ^ bits"; | |
07aff4e3 AC |
6908 | else if (is_independent) |
6909 | s = "position of independent field& must be multiple of ^ bits"; | |
4c24ec6d | 6910 | else if (is_strict_alignment) |
35786aad EB |
6911 | s = "position of & with aliased or tagged part must be" |
6912 | " multiple of ^ bits"; | |
6913 | else | |
bd95368b OH |
6914 | gcc_unreachable (); |
6915 | ||
35786aad EB |
6916 | post_error_ne_num (s, First_Bit (gnat_clause), gnat_field, |
6917 | type_align); | |
6918 | gnu_pos = NULL_TREE; | |
a1ab4c31 AC |
6919 | } |
6920 | ||
35786aad | 6921 | if (gnu_size) |
a1ab4c31 | 6922 | { |
35786aad EB |
6923 | tree gnu_type_size = TYPE_SIZE (gnu_field_type); |
6924 | const int cmp = tree_int_cst_compare (gnu_size, gnu_type_size); | |
a1ab4c31 | 6925 | |
35786aad EB |
6926 | /* If the size is lower than that of the type, or greater for |
6927 | atomic and aliased, then error out and reset the size. */ | |
6928 | if (cmp < 0 || (cmp > 0 && (is_atomic || is_aliased))) | |
6929 | { | |
6930 | const char *s; | |
6931 | ||
6932 | if (is_atomic) | |
6933 | s = "size of atomic field& must be ^ bits"; | |
6934 | else if (is_aliased) | |
6935 | s = "size of aliased field& must be ^ bits"; | |
07aff4e3 AC |
6936 | else if (is_independent) |
6937 | s = "size of independent field& must be at least ^ bits"; | |
4c24ec6d | 6938 | else if (is_strict_alignment) |
35786aad EB |
6939 | s = "size of & with aliased or tagged part must be" |
6940 | " at least ^ bits"; | |
6941 | else | |
6942 | gcc_unreachable (); | |
a1ab4c31 | 6943 | |
35786aad EB |
6944 | post_error_ne_tree (s, Last_Bit (gnat_clause), gnat_field, |
6945 | gnu_type_size); | |
6946 | gnu_size = NULL_TREE; | |
6947 | } | |
a1ab4c31 | 6948 | |
35786aad EB |
6949 | /* Likewise if the size is not a multiple of a byte, */ |
6950 | else if (!integer_zerop (size_binop (TRUNC_MOD_EXPR, gnu_size, | |
6951 | bitsize_unit_node))) | |
6952 | { | |
6953 | const char *s; | |
6954 | ||
07aff4e3 AC |
6955 | if (is_independent) |
6956 | s = "size of independent field& must be multiple of" | |
6957 | " Storage_Unit"; | |
4c24ec6d | 6958 | else if (is_strict_alignment) |
35786aad EB |
6959 | s = "size of & with aliased or tagged part must be" |
6960 | " multiple of Storage_Unit"; | |
6961 | else | |
6962 | gcc_unreachable (); | |
6963 | ||
6964 | post_error_ne (s, Last_Bit (gnat_clause), gnat_field); | |
6965 | gnu_size = NULL_TREE; | |
6966 | } | |
a1ab4c31 AC |
6967 | } |
6968 | } | |
a1ab4c31 AC |
6969 | } |
6970 | ||
6971 | /* If the record has rep clauses and this is the tag field, make a rep | |
6972 | clause for it as well. */ | |
741bd9b1 | 6973 | else if (Has_Specified_Layout (gnat_record_type) |
a1ab4c31 AC |
6974 | && Chars (gnat_field) == Name_uTag) |
6975 | { | |
6976 | gnu_pos = bitsize_zero_node; | |
6977 | gnu_size = TYPE_SIZE (gnu_field_type); | |
6978 | } | |
6979 | ||
6980 | else | |
0025cb63 EB |
6981 | { |
6982 | gnu_pos = NULL_TREE; | |
6983 | ||
6984 | /* If we are packing the record and the field is BLKmode, round the | |
6985 | size up to a byte boundary. */ | |
6986 | if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size) | |
6987 | gnu_size = round_up (gnu_size, BITS_PER_UNIT); | |
6988 | } | |
a1ab4c31 AC |
6989 | |
6990 | /* We need to make the size the maximum for the type if it is | |
6991 | self-referential and an unconstrained type. In that case, we can't | |
6992 | pack the field since we can't make a copy to align it. */ | |
6993 | if (TREE_CODE (gnu_field_type) == RECORD_TYPE | |
6994 | && !gnu_size | |
6995 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type)) | |
c020c92b | 6996 | && !Is_Constrained (Underlying_Type (gnat_field_type))) |
a1ab4c31 AC |
6997 | { |
6998 | gnu_size = max_size (TYPE_SIZE (gnu_field_type), true); | |
6999 | packed = 0; | |
7000 | } | |
7001 | ||
7002 | /* If a size is specified, adjust the field's type to it. */ | |
7003 | if (gnu_size) | |
7004 | { | |
839f2864 EB |
7005 | tree orig_field_type; |
7006 | ||
a1ab4c31 AC |
7007 | /* If the field's type is justified modular, we would need to remove |
7008 | the wrapper to (better) meet the layout requirements. However we | |
7009 | can do so only if the field is not aliased to preserve the unique | |
741bd9b1 EB |
7010 | layout, if it has the same storage order as the enclosing record |
7011 | and if the prescribed size is not greater than that of the packed | |
7012 | array to preserve the justification. */ | |
a1ab4c31 AC |
7013 | if (!needs_strict_alignment |
7014 | && TREE_CODE (gnu_field_type) == RECORD_TYPE | |
7015 | && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) | |
741bd9b1 EB |
7016 | && TYPE_REVERSE_STORAGE_ORDER (gnu_field_type) |
7017 | == Reverse_Storage_Order (gnat_record_type) | |
a1ab4c31 AC |
7018 | && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type)) |
7019 | <= 0) | |
7020 | gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); | |
7021 | ||
afb0fadf EB |
7022 | /* Similarly if the field's type is a misaligned integral type, but |
7023 | there is no restriction on the size as there is no justification. */ | |
7024 | if (!needs_strict_alignment | |
7025 | && TYPE_IS_PADDING_P (gnu_field_type) | |
7026 | && INTEGRAL_TYPE_P (TREE_TYPE (TYPE_FIELDS (gnu_field_type)))) | |
7027 | gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); | |
7028 | ||
a1ab4c31 AC |
7029 | gnu_field_type |
7030 | = make_type_from_size (gnu_field_type, gnu_size, | |
7031 | Has_Biased_Representation (gnat_field)); | |
839f2864 EB |
7032 | |
7033 | orig_field_type = gnu_field_type; | |
a1ab4c31 | 7034 | gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field, |
afb4afcd | 7035 | false, false, definition, true); |
839f2864 EB |
7036 | |
7037 | /* If a padding record was made, declare it now since it will never be | |
7038 | declared otherwise. This is necessary to ensure that its subtrees | |
7039 | are properly marked. */ | |
7040 | if (gnu_field_type != orig_field_type | |
7041 | && !DECL_P (TYPE_NAME (gnu_field_type))) | |
74746d49 EB |
7042 | create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, true, |
7043 | debug_info_p, gnat_field); | |
a1ab4c31 AC |
7044 | } |
7045 | ||
7046 | /* Otherwise (or if there was an error), don't specify a position. */ | |
7047 | else | |
7048 | gnu_pos = NULL_TREE; | |
7049 | ||
ee45a32d EB |
7050 | /* If the field's type is a padded type made for a scalar field of a record |
7051 | type with reverse storage order, we need to propagate the reverse storage | |
7052 | order to the padding type since it is the innermost enclosing aggregate | |
7053 | type around the scalar. */ | |
7054 | if (TYPE_IS_PADDING_P (gnu_field_type) | |
7055 | && TYPE_REVERSE_STORAGE_ORDER (gnu_record_type) | |
7056 | && Is_Scalar_Type (gnat_field_type)) | |
7057 | gnu_field_type = set_reverse_storage_order_on_pad_type (gnu_field_type); | |
7058 | ||
a1ab4c31 AC |
7059 | gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE |
7060 | || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type)); | |
7061 | ||
7062 | /* Now create the decl for the field. */ | |
da01bfee EB |
7063 | gnu_field |
7064 | = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type, | |
4c24ec6d | 7065 | gnu_size, gnu_pos, packed, is_aliased); |
a1ab4c31 | 7066 | Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field)); |
4c24ec6d | 7067 | DECL_ALIASED_P (gnu_field) = is_aliased; |
2056c5ed | 7068 | TREE_SIDE_EFFECTS (gnu_field) = TREE_THIS_VOLATILE (gnu_field) = is_volatile; |
a1ab4c31 AC |
7069 | |
7070 | if (Ekind (gnat_field) == E_Discriminant) | |
64235766 EB |
7071 | { |
7072 | DECL_INVARIANT_P (gnu_field) | |
7073 | = No (Discriminant_Default_Value (gnat_field)); | |
7074 | DECL_DISCRIMINANT_NUMBER (gnu_field) | |
7075 | = UI_To_gnu (Discriminant_Number (gnat_field), sizetype); | |
7076 | } | |
a1ab4c31 AC |
7077 | |
7078 | return gnu_field; | |
7079 | } | |
7080 | \f | |
29e100b3 EB |
7081 | /* Return true if at least one member of COMPONENT_LIST needs strict |
7082 | alignment. */ | |
7083 | ||
7084 | static bool | |
7085 | components_need_strict_alignment (Node_Id component_list) | |
7086 | { | |
7087 | Node_Id component_decl; | |
7088 | ||
7089 | for (component_decl = First_Non_Pragma (Component_Items (component_list)); | |
7090 | Present (component_decl); | |
7091 | component_decl = Next_Non_Pragma (component_decl)) | |
7092 | { | |
7093 | Entity_Id gnat_field = Defining_Entity (component_decl); | |
7094 | ||
7095 | if (Is_Aliased (gnat_field)) | |
78df6221 | 7096 | return true; |
29e100b3 EB |
7097 | |
7098 | if (Strict_Alignment (Etype (gnat_field))) | |
78df6221 | 7099 | return true; |
29e100b3 EB |
7100 | } |
7101 | ||
78df6221 | 7102 | return false; |
29e100b3 EB |
7103 | } |
7104 | ||
f45ccc7c AC |
7105 | /* Return true if TYPE is a type with variable size or a padding type with a |
7106 | field of variable size or a record that has a field with such a type. */ | |
a1ab4c31 AC |
7107 | |
7108 | static bool | |
5f2e59d4 | 7109 | type_has_variable_size (tree type) |
a1ab4c31 AC |
7110 | { |
7111 | tree field; | |
7112 | ||
7113 | if (!TREE_CONSTANT (TYPE_SIZE (type))) | |
7114 | return true; | |
7115 | ||
315cff15 | 7116 | if (TYPE_IS_PADDING_P (type) |
a1ab4c31 AC |
7117 | && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type)))) |
7118 | return true; | |
7119 | ||
e1e5852c | 7120 | if (!RECORD_OR_UNION_TYPE_P (type)) |
a1ab4c31 AC |
7121 | return false; |
7122 | ||
910ad8de | 7123 | for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) |
5f2e59d4 | 7124 | if (type_has_variable_size (TREE_TYPE (field))) |
a1ab4c31 AC |
7125 | return true; |
7126 | ||
7127 | return false; | |
7128 | } | |
7129 | \f | |
5f2e59d4 EB |
7130 | /* Return true if FIELD is an artificial field. */ |
7131 | ||
7132 | static bool | |
7133 | field_is_artificial (tree field) | |
7134 | { | |
7135 | /* These fields are generated by the front-end proper. */ | |
7136 | if (IDENTIFIER_POINTER (DECL_NAME (field)) [0] == '_') | |
7137 | return true; | |
7138 | ||
7139 | /* These fields are generated by gigi. */ | |
7140 | if (DECL_INTERNAL_P (field)) | |
7141 | return true; | |
7142 | ||
7143 | return false; | |
7144 | } | |
7145 | ||
5f2e59d4 EB |
7146 | /* Return true if FIELD is a non-artificial field with self-referential |
7147 | size. */ | |
7148 | ||
7149 | static bool | |
7150 | field_has_self_size (tree field) | |
7151 | { | |
7152 | if (field_is_artificial (field)) | |
7153 | return false; | |
7154 | ||
7155 | if (DECL_SIZE (field) && TREE_CODE (DECL_SIZE (field)) == INTEGER_CST) | |
7156 | return false; | |
7157 | ||
7158 | return CONTAINS_PLACEHOLDER_P (TYPE_SIZE (TREE_TYPE (field))); | |
7159 | } | |
7160 | ||
7161 | /* Return true if FIELD is a non-artificial field with variable size. */ | |
7162 | ||
7163 | static bool | |
7164 | field_has_variable_size (tree field) | |
7165 | { | |
7166 | if (field_is_artificial (field)) | |
7167 | return false; | |
7168 | ||
7169 | if (DECL_SIZE (field) && TREE_CODE (DECL_SIZE (field)) == INTEGER_CST) | |
7170 | return false; | |
7171 | ||
7172 | return TREE_CODE (TYPE_SIZE (TREE_TYPE (field))) != INTEGER_CST; | |
7173 | } | |
7174 | ||
a1ab4c31 AC |
7175 | /* qsort comparer for the bit positions of two record components. */ |
7176 | ||
7177 | static int | |
7178 | compare_field_bitpos (const PTR rt1, const PTR rt2) | |
7179 | { | |
7180 | const_tree const field1 = * (const_tree const *) rt1; | |
7181 | const_tree const field2 = * (const_tree const *) rt2; | |
7182 | const int ret | |
7183 | = tree_int_cst_compare (bit_position (field1), bit_position (field2)); | |
7184 | ||
7185 | return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2)); | |
7186 | } | |
7187 | ||
8ab31c0c AC |
7188 | /* Reverse function from gnat_to_gnu_field: return the GNAT field present in |
7189 | either GNAT_COMPONENT_LIST or the discriminants of GNAT_RECORD_TYPE, and | |
7190 | corresponding to the GNU tree GNU_FIELD. */ | |
7191 | ||
7192 | static Entity_Id | |
7193 | gnu_field_to_gnat (tree gnu_field, Node_Id gnat_component_list, | |
7194 | Entity_Id gnat_record_type) | |
7195 | { | |
7196 | Entity_Id gnat_component_decl, gnat_field; | |
7197 | ||
7198 | if (Present (Component_Items (gnat_component_list))) | |
7199 | for (gnat_component_decl | |
7200 | = First_Non_Pragma (Component_Items (gnat_component_list)); | |
7201 | Present (gnat_component_decl); | |
7202 | gnat_component_decl = Next_Non_Pragma (gnat_component_decl)) | |
7203 | { | |
7204 | gnat_field = Defining_Entity (gnat_component_decl); | |
7205 | if (gnat_to_gnu_field_decl (gnat_field) == gnu_field) | |
7206 | return gnat_field; | |
7207 | } | |
7208 | ||
7209 | if (Has_Discriminants (gnat_record_type)) | |
7210 | for (gnat_field = First_Stored_Discriminant (gnat_record_type); | |
7211 | Present (gnat_field); | |
7212 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
7213 | if (gnat_to_gnu_field_decl (gnat_field) == gnu_field) | |
7214 | return gnat_field; | |
7215 | ||
7216 | return Empty; | |
7217 | } | |
7218 | ||
7219 | /* Issue a warning for the problematic placement of GNU_FIELD present in | |
7220 | either GNAT_COMPONENT_LIST or the discriminants of GNAT_RECORD_TYPE. | |
7221 | IN_VARIANT is true if GNAT_COMPONENT_LIST is the list of a variant. | |
7222 | DO_REORDER is true if fields of GNAT_RECORD_TYPE are being reordered. */ | |
7223 | ||
7224 | static void | |
7225 | warn_on_field_placement (tree gnu_field, Node_Id gnat_component_list, | |
7226 | Entity_Id gnat_record_type, bool in_variant, | |
7227 | bool do_reorder) | |
7228 | { | |
3f8cf834 EB |
7229 | if (!Comes_From_Source (gnat_record_type)) |
7230 | return; | |
7231 | ||
8ab31c0c AC |
7232 | const char *msg1 |
7233 | = in_variant | |
7234 | ? "?variant layout may cause performance issues" | |
7235 | : "?record layout may cause performance issues"; | |
7236 | const char *msg2 | |
7237 | = field_has_self_size (gnu_field) | |
7238 | ? "?component & whose length depends on a discriminant" | |
7239 | : field_has_variable_size (gnu_field) | |
7240 | ? "?component & whose length is not fixed" | |
7241 | : "?component & whose length is not multiple of a byte"; | |
7242 | const char *msg3 | |
7243 | = do_reorder | |
7244 | ? "?comes too early and was moved down" | |
7245 | : "?comes too early and ought to be moved down"; | |
3f8cf834 | 7246 | |
8ab31c0c AC |
7247 | Entity_Id gnat_field |
7248 | = gnu_field_to_gnat (gnu_field, gnat_component_list, gnat_record_type); | |
7249 | ||
7250 | gcc_assert (Present (gnat_field)); | |
7251 | ||
7252 | post_error (msg1, gnat_field); | |
7253 | post_error_ne (msg2, gnat_field, gnat_field); | |
7254 | post_error (msg3, gnat_field); | |
7255 | } | |
7256 | ||
9580628d EB |
7257 | /* Structure holding information for a given variant. */ |
7258 | typedef struct vinfo | |
7259 | { | |
7260 | /* The record type of the variant. */ | |
7261 | tree type; | |
7262 | ||
7263 | /* The name of the variant. */ | |
7264 | tree name; | |
7265 | ||
7266 | /* The qualifier of the variant. */ | |
7267 | tree qual; | |
7268 | ||
7269 | /* Whether the variant has a rep clause. */ | |
7270 | bool has_rep; | |
7271 | ||
7272 | /* Whether the variant is packed. */ | |
7273 | bool packed; | |
7274 | ||
7275 | } vinfo_t; | |
7276 | ||
8ab31c0c AC |
7277 | /* Translate and chain GNAT_COMPONENT_LIST present in GNAT_RECORD_TYPE to |
7278 | GNU_FIELD_LIST, set the result as the field list of GNU_RECORD_TYPE and | |
7279 | finish it up. Return true if GNU_RECORD_TYPE has a rep clause that affects | |
7280 | the layout (see below). When called from gnat_to_gnu_entity during the | |
7281 | processing of a record definition, the GCC node for the parent, if any, | |
7282 | will be the single field of GNU_RECORD_TYPE and the GCC nodes for the | |
7283 | discriminants will be on GNU_FIELD_LIST. The other call to this function | |
7284 | is a recursive call for the component list of a variant and, in this case, | |
7285 | GNU_FIELD_LIST is empty. | |
a1ab4c31 | 7286 | |
14ecca2e EB |
7287 | PACKED is 1 if this is for a packed record or -1 if this is for a record |
7288 | with Component_Alignment of Storage_Unit. | |
a1ab4c31 | 7289 | |
032d1b71 | 7290 | DEFINITION is true if we are defining this record type. |
a1ab4c31 | 7291 | |
032d1b71 EB |
7292 | CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying |
7293 | out the record. This means the alignment only serves to force fields to | |
7294 | be bitfields, but not to require the record to be that aligned. This is | |
7295 | used for variants. | |
7296 | ||
7297 | ALL_REP is true if a rep clause is present for all the fields. | |
a1ab4c31 | 7298 | |
032d1b71 EB |
7299 | UNCHECKED_UNION is true if we are building this type for a record with a |
7300 | Pragma Unchecked_Union. | |
a1ab4c31 | 7301 | |
fd787640 EB |
7302 | ARTIFICIAL is true if this is a type that was generated by the compiler. |
7303 | ||
ef0feeb2 | 7304 | DEBUG_INFO is true if we need to write debug information about the type. |
a1ab4c31 | 7305 | |
032d1b71 | 7306 | MAYBE_UNUSED is true if this type may be unused in the end; this doesn't |
ef0feeb2 | 7307 | mean that its contents may be unused as well, only the container itself. |
839f2864 | 7308 | |
b1a785fb EB |
7309 | FIRST_FREE_POS, if nonzero, is the first (lowest) free field position in |
7310 | the outer record type down to this variant level. It is nonzero only if | |
7311 | all the fields down to this level have a rep clause and ALL_REP is false. | |
7312 | ||
ef0feeb2 EB |
7313 | P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field |
7314 | with a rep clause is to be added; in this case, that is all that should | |
9580628d | 7315 | be done with such fields and the return value will be false. */ |
a1ab4c31 | 7316 | |
9580628d | 7317 | static bool |
8ab31c0c AC |
7318 | components_to_record (Node_Id gnat_component_list, Entity_Id gnat_record_type, |
7319 | tree gnu_field_list, tree gnu_record_type, int packed, | |
7320 | bool definition, bool cancel_alignment, bool all_rep, | |
7321 | bool unchecked_union, bool artificial, bool debug_info, | |
7322 | bool maybe_unused, tree first_free_pos, | |
7323 | tree *p_gnu_rep_list) | |
a1ab4c31 | 7324 | { |
986ccd21 PMR |
7325 | const bool needs_xv_encodings |
7326 | = debug_info && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL; | |
a1ab4c31 | 7327 | bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type); |
9580628d | 7328 | bool variants_have_rep = all_rep; |
8cd28148 | 7329 | bool layout_with_rep = false; |
5f2e59d4 EB |
7330 | bool has_self_field = false; |
7331 | bool has_aliased_after_self_field = false; | |
8ab31c0c | 7332 | Entity_Id gnat_component_decl, gnat_variant_part; |
ef0feeb2 EB |
7333 | tree gnu_field, gnu_next, gnu_last; |
7334 | tree gnu_variant_part = NULL_TREE; | |
7335 | tree gnu_rep_list = NULL_TREE; | |
a1ab4c31 | 7336 | |
8cd28148 EB |
7337 | /* For each component referenced in a component declaration create a GCC |
7338 | field and add it to the list, skipping pragmas in the GNAT list. */ | |
ef0feeb2 | 7339 | gnu_last = tree_last (gnu_field_list); |
8cd28148 | 7340 | if (Present (Component_Items (gnat_component_list))) |
8ab31c0c | 7341 | for (gnat_component_decl |
8cd28148 | 7342 | = First_Non_Pragma (Component_Items (gnat_component_list)); |
8ab31c0c AC |
7343 | Present (gnat_component_decl); |
7344 | gnat_component_decl = Next_Non_Pragma (gnat_component_decl)) | |
a1ab4c31 | 7345 | { |
8ab31c0c | 7346 | Entity_Id gnat_field = Defining_Entity (gnat_component_decl); |
a6a29d0c | 7347 | Name_Id gnat_name = Chars (gnat_field); |
a1ab4c31 | 7348 | |
a6a29d0c EB |
7349 | /* If present, the _Parent field must have been created as the single |
7350 | field of the record type. Put it before any other fields. */ | |
7351 | if (gnat_name == Name_uParent) | |
7352 | { | |
7353 | gnu_field = TYPE_FIELDS (gnu_record_type); | |
7354 | gnu_field_list = chainon (gnu_field_list, gnu_field); | |
7355 | } | |
a1ab4c31 AC |
7356 | else |
7357 | { | |
839f2864 | 7358 | gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed, |
ef0feeb2 | 7359 | definition, debug_info); |
a1ab4c31 | 7360 | |
a6a29d0c EB |
7361 | /* If this is the _Tag field, put it before any other fields. */ |
7362 | if (gnat_name == Name_uTag) | |
a1ab4c31 | 7363 | gnu_field_list = chainon (gnu_field_list, gnu_field); |
a6a29d0c EB |
7364 | |
7365 | /* If this is the _Controller field, put it before the other | |
7366 | fields except for the _Tag or _Parent field. */ | |
7367 | else if (gnat_name == Name_uController && gnu_last) | |
7368 | { | |
910ad8de NF |
7369 | DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); |
7370 | DECL_CHAIN (gnu_last) = gnu_field; | |
a6a29d0c EB |
7371 | } |
7372 | ||
7373 | /* If this is a regular field, put it after the other fields. */ | |
a1ab4c31 AC |
7374 | else |
7375 | { | |
910ad8de | 7376 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 | 7377 | gnu_field_list = gnu_field; |
a6a29d0c EB |
7378 | if (!gnu_last) |
7379 | gnu_last = gnu_field; | |
5f2e59d4 EB |
7380 | |
7381 | /* And record information for the final layout. */ | |
7382 | if (field_has_self_size (gnu_field)) | |
7383 | has_self_field = true; | |
05dbb83f | 7384 | else if (has_self_field && DECL_ALIASED_P (gnu_field)) |
5f2e59d4 | 7385 | has_aliased_after_self_field = true; |
a1ab4c31 AC |
7386 | } |
7387 | } | |
7388 | ||
2ddc34ba | 7389 | save_gnu_tree (gnat_field, gnu_field, false); |
a1ab4c31 AC |
7390 | } |
7391 | ||
7392 | /* At the end of the component list there may be a variant part. */ | |
8ab31c0c | 7393 | gnat_variant_part = Variant_Part (gnat_component_list); |
a1ab4c31 AC |
7394 | |
7395 | /* We create a QUAL_UNION_TYPE for the variant part since the variants are | |
7396 | mutually exclusive and should go in the same memory. To do this we need | |
7397 | to treat each variant as a record whose elements are created from the | |
7398 | component list for the variant. So here we create the records from the | |
7399 | lists for the variants and put them all into the QUAL_UNION_TYPE. | |
7400 | If this is an Unchecked_Union, we make a UNION_TYPE instead or | |
7401 | use GNU_RECORD_TYPE if there are no fields so far. */ | |
8ab31c0c | 7402 | if (Present (gnat_variant_part)) |
a1ab4c31 | 7403 | { |
8ab31c0c | 7404 | Node_Id gnat_discr = Name (gnat_variant_part), variant; |
0fb2335d | 7405 | tree gnu_discr = gnat_to_gnu (gnat_discr); |
9dba4b55 | 7406 | tree gnu_name = TYPE_IDENTIFIER (gnu_record_type); |
a1ab4c31 | 7407 | tree gnu_var_name |
0fb2335d EB |
7408 | = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))), |
7409 | "XVN"); | |
ef0feeb2 | 7410 | tree gnu_union_type, gnu_union_name; |
b1a785fb | 7411 | tree this_first_free_pos, gnu_variant_list = NULL_TREE; |
29e100b3 | 7412 | bool union_field_needs_strict_alignment = false; |
00f96dc9 | 7413 | auto_vec <vinfo_t, 16> variant_types; |
9580628d EB |
7414 | vinfo_t *gnu_variant; |
7415 | unsigned int variants_align = 0; | |
7416 | unsigned int i; | |
7417 | ||
0fb2335d EB |
7418 | gnu_union_name |
7419 | = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name)); | |
a1ab4c31 | 7420 | |
b1a785fb EB |
7421 | /* Reuse the enclosing union if this is an Unchecked_Union whose fields |
7422 | are all in the variant part, to match the layout of C unions. There | |
7423 | is an associated check below. */ | |
7424 | if (TREE_CODE (gnu_record_type) == UNION_TYPE) | |
a1ab4c31 AC |
7425 | gnu_union_type = gnu_record_type; |
7426 | else | |
7427 | { | |
7428 | gnu_union_type | |
7429 | = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE); | |
7430 | ||
7431 | TYPE_NAME (gnu_union_type) = gnu_union_name; | |
fe37c7af | 7432 | SET_TYPE_ALIGN (gnu_union_type, 0); |
a1ab4c31 | 7433 | TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type); |
ee45a32d EB |
7434 | TYPE_REVERSE_STORAGE_ORDER (gnu_union_type) |
7435 | = TYPE_REVERSE_STORAGE_ORDER (gnu_record_type); | |
a1ab4c31 AC |
7436 | } |
7437 | ||
b1a785fb EB |
7438 | /* If all the fields down to this level have a rep clause, find out |
7439 | whether all the fields at this level also have one. If so, then | |
7440 | compute the new first free position to be passed downward. */ | |
7441 | this_first_free_pos = first_free_pos; | |
7442 | if (this_first_free_pos) | |
7443 | { | |
7444 | for (gnu_field = gnu_field_list; | |
7445 | gnu_field; | |
7446 | gnu_field = DECL_CHAIN (gnu_field)) | |
7447 | if (DECL_FIELD_OFFSET (gnu_field)) | |
7448 | { | |
7449 | tree pos = bit_position (gnu_field); | |
7450 | if (!tree_int_cst_lt (pos, this_first_free_pos)) | |
7451 | this_first_free_pos | |
7452 | = size_binop (PLUS_EXPR, pos, DECL_SIZE (gnu_field)); | |
7453 | } | |
7454 | else | |
7455 | { | |
7456 | this_first_free_pos = NULL_TREE; | |
7457 | break; | |
7458 | } | |
7459 | } | |
7460 | ||
9580628d EB |
7461 | /* We build the variants in two passes. The bulk of the work is done in |
7462 | the first pass, that is to say translating the GNAT nodes, building | |
7463 | the container types and computing the associated properties. However | |
7464 | we cannot finish up the container types during this pass because we | |
7465 | don't know where the variant part will be placed until the end. */ | |
8ab31c0c | 7466 | for (variant = First_Non_Pragma (Variants (gnat_variant_part)); |
a1ab4c31 AC |
7467 | Present (variant); |
7468 | variant = Next_Non_Pragma (variant)) | |
7469 | { | |
7470 | tree gnu_variant_type = make_node (RECORD_TYPE); | |
9580628d EB |
7471 | tree gnu_inner_name, gnu_qual; |
7472 | bool has_rep; | |
7473 | int field_packed; | |
7474 | vinfo_t vinfo; | |
a1ab4c31 AC |
7475 | |
7476 | Get_Variant_Encoding (variant); | |
0fb2335d | 7477 | gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len); |
a1ab4c31 | 7478 | TYPE_NAME (gnu_variant_type) |
0fb2335d EB |
7479 | = concat_name (gnu_union_name, |
7480 | IDENTIFIER_POINTER (gnu_inner_name)); | |
a1ab4c31 AC |
7481 | |
7482 | /* Set the alignment of the inner type in case we need to make | |
8cd28148 EB |
7483 | inner objects into bitfields, but then clear it out so the |
7484 | record actually gets only the alignment required. */ | |
fe37c7af | 7485 | SET_TYPE_ALIGN (gnu_variant_type, TYPE_ALIGN (gnu_record_type)); |
a1ab4c31 | 7486 | TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type); |
ee45a32d EB |
7487 | TYPE_REVERSE_STORAGE_ORDER (gnu_variant_type) |
7488 | = TYPE_REVERSE_STORAGE_ORDER (gnu_record_type); | |
a1ab4c31 | 7489 | |
8cd28148 | 7490 | /* Similarly, if the outer record has a size specified and all |
b1a785fb | 7491 | the fields have a rep clause, we can propagate the size. */ |
a1ab4c31 AC |
7492 | if (all_rep_and_size) |
7493 | { | |
7494 | TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type); | |
7495 | TYPE_SIZE_UNIT (gnu_variant_type) | |
7496 | = TYPE_SIZE_UNIT (gnu_record_type); | |
7497 | } | |
7498 | ||
032d1b71 EB |
7499 | /* Add the fields into the record type for the variant. Note that |
7500 | we aren't sure to really use it at this point, see below. */ | |
9580628d | 7501 | has_rep |
8ab31c0c AC |
7502 | = components_to_record (Component_List (variant), gnat_record_type, |
7503 | NULL_TREE, gnu_variant_type, packed, | |
7504 | definition, !all_rep_and_size, all_rep, | |
7505 | unchecked_union, true, needs_xv_encodings, | |
7506 | true, this_first_free_pos, | |
9580628d EB |
7507 | all_rep || this_first_free_pos |
7508 | ? NULL : &gnu_rep_list); | |
7509 | ||
7510 | /* Translate the qualifier and annotate the GNAT node. */ | |
0fb2335d | 7511 | gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant)); |
a1ab4c31 AC |
7512 | Set_Present_Expr (variant, annotate_value (gnu_qual)); |
7513 | ||
9580628d EB |
7514 | /* Deal with packedness like in gnat_to_gnu_field. */ |
7515 | if (components_need_strict_alignment (Component_List (variant))) | |
7516 | { | |
7517 | field_packed = 0; | |
7518 | union_field_needs_strict_alignment = true; | |
7519 | } | |
7520 | else | |
7521 | field_packed | |
7522 | = adjust_packed (gnu_variant_type, gnu_record_type, packed); | |
7523 | ||
7524 | /* Push this variant onto the stack for the second pass. */ | |
7525 | vinfo.type = gnu_variant_type; | |
7526 | vinfo.name = gnu_inner_name; | |
7527 | vinfo.qual = gnu_qual; | |
7528 | vinfo.has_rep = has_rep; | |
7529 | vinfo.packed = field_packed; | |
7530 | variant_types.safe_push (vinfo); | |
7531 | ||
7532 | /* Compute the global properties that will determine the placement of | |
7533 | the variant part. */ | |
7534 | variants_have_rep |= has_rep; | |
7535 | if (!field_packed && TYPE_ALIGN (gnu_variant_type) > variants_align) | |
7536 | variants_align = TYPE_ALIGN (gnu_variant_type); | |
7537 | } | |
7538 | ||
7539 | /* Round up the first free position to the alignment of the variant part | |
7540 | for the variants without rep clause. This will guarantee a consistent | |
7541 | layout independently of the placement of the variant part. */ | |
7542 | if (variants_have_rep && variants_align > 0 && this_first_free_pos) | |
7543 | this_first_free_pos = round_up (this_first_free_pos, variants_align); | |
7544 | ||
7545 | /* In the second pass, the container types are adjusted if necessary and | |
7546 | finished up, then the corresponding fields of the variant part are | |
7547 | built with their qualifier, unless this is an unchecked union. */ | |
7548 | FOR_EACH_VEC_ELT (variant_types, i, gnu_variant) | |
7549 | { | |
7550 | tree gnu_variant_type = gnu_variant->type; | |
7551 | tree gnu_field_list = TYPE_FIELDS (gnu_variant_type); | |
7552 | ||
b1a785fb EB |
7553 | /* If this is an Unchecked_Union whose fields are all in the variant |
7554 | part and we have a single field with no representation clause or | |
7555 | placed at offset zero, use the field directly to match the layout | |
7556 | of C unions. */ | |
7557 | if (TREE_CODE (gnu_record_type) == UNION_TYPE | |
9580628d EB |
7558 | && gnu_field_list |
7559 | && !DECL_CHAIN (gnu_field_list) | |
7560 | && (!DECL_FIELD_OFFSET (gnu_field_list) | |
7561 | || integer_zerop (bit_position (gnu_field_list)))) | |
7562 | { | |
7563 | gnu_field = gnu_field_list; | |
7564 | DECL_CONTEXT (gnu_field) = gnu_record_type; | |
7565 | } | |
a1ab4c31 AC |
7566 | else |
7567 | { | |
9580628d EB |
7568 | /* Finalize the variant type now. We used to throw away empty |
7569 | record types but we no longer do that because we need them to | |
7570 | generate complete debug info for the variant; otherwise, the | |
7571 | union type definition will be lacking the fields associated | |
7572 | with these empty variants. */ | |
7573 | if (gnu_field_list && variants_have_rep && !gnu_variant->has_rep) | |
29e100b3 | 7574 | { |
9580628d EB |
7575 | /* The variant part will be at offset 0 so we need to ensure |
7576 | that the fields are laid out starting from the first free | |
7577 | position at this level. */ | |
7578 | tree gnu_rep_type = make_node (RECORD_TYPE); | |
7579 | tree gnu_rep_part; | |
ee45a32d EB |
7580 | TYPE_REVERSE_STORAGE_ORDER (gnu_rep_type) |
7581 | = TYPE_REVERSE_STORAGE_ORDER (gnu_variant_type); | |
9580628d EB |
7582 | finish_record_type (gnu_rep_type, NULL_TREE, 0, debug_info); |
7583 | gnu_rep_part | |
7584 | = create_rep_part (gnu_rep_type, gnu_variant_type, | |
7585 | this_first_free_pos); | |
7586 | DECL_CHAIN (gnu_rep_part) = gnu_field_list; | |
7587 | gnu_field_list = gnu_rep_part; | |
7588 | finish_record_type (gnu_variant_type, gnu_field_list, 0, | |
7589 | false); | |
29e100b3 | 7590 | } |
9580628d EB |
7591 | |
7592 | if (debug_info) | |
7593 | rest_of_record_type_compilation (gnu_variant_type); | |
95c1c4bb | 7594 | create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type, |
986ccd21 | 7595 | true, needs_xv_encodings, gnat_component_list); |
a1ab4c31 | 7596 | |
da01bfee | 7597 | gnu_field |
9580628d | 7598 | = create_field_decl (gnu_variant->name, gnu_variant_type, |
da01bfee EB |
7599 | gnu_union_type, |
7600 | all_rep_and_size | |
7601 | ? TYPE_SIZE (gnu_variant_type) : 0, | |
9580628d EB |
7602 | variants_have_rep ? bitsize_zero_node : 0, |
7603 | gnu_variant->packed, 0); | |
a1ab4c31 AC |
7604 | |
7605 | DECL_INTERNAL_P (gnu_field) = 1; | |
7606 | ||
7607 | if (!unchecked_union) | |
9580628d | 7608 | DECL_QUALIFIER (gnu_field) = gnu_variant->qual; |
a1ab4c31 AC |
7609 | } |
7610 | ||
910ad8de | 7611 | DECL_CHAIN (gnu_field) = gnu_variant_list; |
a1ab4c31 AC |
7612 | gnu_variant_list = gnu_field; |
7613 | } | |
7614 | ||
8cd28148 | 7615 | /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */ |
a1ab4c31 AC |
7616 | if (gnu_variant_list) |
7617 | { | |
7618 | int union_field_packed; | |
7619 | ||
7620 | if (all_rep_and_size) | |
7621 | { | |
7622 | TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type); | |
7623 | TYPE_SIZE_UNIT (gnu_union_type) | |
7624 | = TYPE_SIZE_UNIT (gnu_record_type); | |
7625 | } | |
7626 | ||
7627 | finish_record_type (gnu_union_type, nreverse (gnu_variant_list), | |
986ccd21 | 7628 | all_rep_and_size ? 1 : 0, needs_xv_encodings); |
a1ab4c31 AC |
7629 | |
7630 | /* If GNU_UNION_TYPE is our record type, it means we must have an | |
7631 | Unchecked_Union with no fields. Verify that and, if so, just | |
7632 | return. */ | |
7633 | if (gnu_union_type == gnu_record_type) | |
7634 | { | |
7635 | gcc_assert (unchecked_union | |
7636 | && !gnu_field_list | |
ef0feeb2 | 7637 | && !gnu_rep_list); |
9580628d | 7638 | return variants_have_rep; |
a1ab4c31 AC |
7639 | } |
7640 | ||
74746d49 | 7641 | create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type, true, |
986ccd21 | 7642 | needs_xv_encodings, gnat_component_list); |
95c1c4bb | 7643 | |
a1ab4c31 | 7644 | /* Deal with packedness like in gnat_to_gnu_field. */ |
29e100b3 EB |
7645 | if (union_field_needs_strict_alignment) |
7646 | union_field_packed = 0; | |
7647 | else | |
7648 | union_field_packed | |
7649 | = adjust_packed (gnu_union_type, gnu_record_type, packed); | |
a1ab4c31 | 7650 | |
ef0feeb2 | 7651 | gnu_variant_part |
a1ab4c31 | 7652 | = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type, |
29e100b3 EB |
7653 | all_rep_and_size |
7654 | ? TYPE_SIZE (gnu_union_type) : 0, | |
9580628d | 7655 | variants_have_rep ? bitsize_zero_node : 0, |
da01bfee | 7656 | union_field_packed, 0); |
a1ab4c31 | 7657 | |
ef0feeb2 | 7658 | DECL_INTERNAL_P (gnu_variant_part) = 1; |
a1ab4c31 AC |
7659 | } |
7660 | } | |
7661 | ||
8ab31c0c | 7662 | /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they do, |
8489c295 | 7663 | pull them out and put them onto the appropriate list. |
8cd28148 | 7664 | |
6bc8df24 EB |
7665 | Similarly, pull out the fields with zero size and no rep clause, as they |
7666 | would otherwise modify the layout and thus very likely run afoul of the | |
7667 | Ada semantics, which are different from those of C here. | |
7668 | ||
8ab31c0c AC |
7669 | Finally, if there is an aliased field placed in the list after fields |
7670 | with self-referential size, pull out the latter in the same way. | |
7671 | ||
7672 | Optionally, if the reordering mechanism is enabled, pull out the fields | |
7673 | with self-referential size, variable size and fixed size not a multiple | |
7674 | of a byte, so that they don't cause the regular fields to be either at | |
7675 | self-referential/variable offset or misaligned. Note, in the latter | |
7676 | case, that this can only happen in packed record types so the alignment | |
a713e7bb EB |
7677 | is effectively capped to the byte for the whole record. But we don't |
7678 | do it for non-packed record types if pragma Optimize_Alignment (Space) | |
7679 | is specified because this can prevent alignment gaps from being filled. | |
8ab31c0c AC |
7680 | |
7681 | Optionally, if the layout warning is enabled, keep track of the above 4 | |
7682 | different kinds of fields and issue a warning if some of them would be | |
7683 | (or are being) reordered by the reordering mechanism. | |
7684 | ||
8489c295 AC |
7685 | ??? If we reorder fields, the debugging information will be affected and |
7686 | the debugger print fields in a different order from the source code. */ | |
7687 | const bool do_reorder | |
7688 | = (Convention (gnat_record_type) == Convention_Ada | |
7689 | && !No_Reordering (gnat_record_type) | |
a713e7bb EB |
7690 | && (!Optimize_Alignment_Space (gnat_record_type) |
7691 | || Is_Packed (gnat_record_type)) | |
8489c295 | 7692 | && !debug__debug_flag_dot_r); |
8ab31c0c | 7693 | const bool w_reorder |
8489c295 AC |
7694 | = (Convention (gnat_record_type) == Convention_Ada |
7695 | && Warn_On_Questionable_Layout | |
7696 | && !(No_Reordering (gnat_record_type) && GNAT_Mode)); | |
8ab31c0c AC |
7697 | const bool in_variant = (p_gnu_rep_list != NULL); |
7698 | tree gnu_zero_list = NULL_TREE; | |
7699 | tree gnu_self_list = NULL_TREE; | |
7700 | tree gnu_var_list = NULL_TREE; | |
7701 | tree gnu_bitp_list = NULL_TREE; | |
7702 | tree gnu_tmp_bitp_list = NULL_TREE; | |
7703 | unsigned int tmp_bitp_size = 0; | |
7704 | unsigned int last_reorder_field_type = -1; | |
7705 | unsigned int tmp_last_reorder_field_type = -1; | |
ef0feeb2 EB |
7706 | |
7707 | #define MOVE_FROM_FIELD_LIST_TO(LIST) \ | |
7708 | do { \ | |
7709 | if (gnu_last) \ | |
7710 | DECL_CHAIN (gnu_last) = gnu_next; \ | |
7711 | else \ | |
7712 | gnu_field_list = gnu_next; \ | |
7713 | \ | |
7714 | DECL_CHAIN (gnu_field) = (LIST); \ | |
7715 | (LIST) = gnu_field; \ | |
7716 | } while (0) | |
7717 | ||
8ab31c0c | 7718 | gnu_last = NULL_TREE; |
8cd28148 | 7719 | for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next) |
a1ab4c31 | 7720 | { |
910ad8de | 7721 | gnu_next = DECL_CHAIN (gnu_field); |
8cd28148 | 7722 | |
a1ab4c31 AC |
7723 | if (DECL_FIELD_OFFSET (gnu_field)) |
7724 | { | |
ef0feeb2 EB |
7725 | MOVE_FROM_FIELD_LIST_TO (gnu_rep_list); |
7726 | continue; | |
7727 | } | |
7728 | ||
6bc8df24 EB |
7729 | if (DECL_SIZE (gnu_field) && integer_zerop (DECL_SIZE (gnu_field))) |
7730 | { | |
7731 | DECL_FIELD_OFFSET (gnu_field) = size_zero_node; | |
7732 | SET_DECL_OFFSET_ALIGN (gnu_field, BIGGEST_ALIGNMENT); | |
7733 | DECL_FIELD_BIT_OFFSET (gnu_field) = bitsize_zero_node; | |
05dbb83f | 7734 | if (DECL_ALIASED_P (gnu_field)) |
fe37c7af MM |
7735 | SET_TYPE_ALIGN (gnu_record_type, |
7736 | MAX (TYPE_ALIGN (gnu_record_type), | |
7737 | TYPE_ALIGN (TREE_TYPE (gnu_field)))); | |
6bc8df24 EB |
7738 | MOVE_FROM_FIELD_LIST_TO (gnu_zero_list); |
7739 | continue; | |
7740 | } | |
7741 | ||
8ab31c0c AC |
7742 | if (has_aliased_after_self_field && field_has_self_size (gnu_field)) |
7743 | { | |
7744 | MOVE_FROM_FIELD_LIST_TO (gnu_self_list); | |
7745 | continue; | |
7746 | } | |
7747 | ||
7748 | /* We don't need further processing in default mode. */ | |
7749 | if (!w_reorder && !do_reorder) | |
7750 | { | |
7751 | gnu_last = gnu_field; | |
7752 | continue; | |
7753 | } | |
7754 | ||
7755 | if (field_has_self_size (gnu_field)) | |
7756 | { | |
7757 | if (w_reorder) | |
7758 | { | |
7759 | if (last_reorder_field_type < 4) | |
7760 | warn_on_field_placement (gnu_field, gnat_component_list, | |
7761 | gnat_record_type, in_variant, | |
7762 | do_reorder); | |
7763 | else | |
7764 | last_reorder_field_type = 4; | |
7765 | } | |
7766 | ||
7767 | if (do_reorder) | |
7768 | { | |
7769 | MOVE_FROM_FIELD_LIST_TO (gnu_self_list); | |
7770 | continue; | |
7771 | } | |
7772 | } | |
7773 | ||
7774 | else if (field_has_variable_size (gnu_field)) | |
7775 | { | |
7776 | if (w_reorder) | |
7777 | { | |
7778 | if (last_reorder_field_type < 3) | |
7779 | warn_on_field_placement (gnu_field, gnat_component_list, | |
7780 | gnat_record_type, in_variant, | |
7781 | do_reorder); | |
7782 | else | |
7783 | last_reorder_field_type = 3; | |
7784 | } | |
7785 | ||
7786 | if (do_reorder) | |
7787 | { | |
7788 | MOVE_FROM_FIELD_LIST_TO (gnu_var_list); | |
7789 | continue; | |
7790 | } | |
7791 | } | |
7792 | ||
7793 | else | |
7794 | { | |
7795 | /* If the field has no size, then it cannot be bit-packed. */ | |
7796 | const unsigned int bitp_size | |
7797 | = DECL_SIZE (gnu_field) | |
7798 | ? TREE_INT_CST_LOW (DECL_SIZE (gnu_field)) % BITS_PER_UNIT | |
7799 | : 0; | |
7800 | ||
7801 | /* If the field is bit-packed, we move it to a temporary list that | |
7802 | contains the contiguously preceding bit-packed fields, because | |
7803 | we want to be able to put them back if the misalignment happens | |
7804 | to cancel itself after several bit-packed fields. */ | |
7805 | if (bitp_size != 0) | |
7806 | { | |
7807 | tmp_bitp_size = (tmp_bitp_size + bitp_size) % BITS_PER_UNIT; | |
7808 | ||
7809 | if (last_reorder_field_type != 2) | |
7810 | { | |
7811 | tmp_last_reorder_field_type = last_reorder_field_type; | |
7812 | last_reorder_field_type = 2; | |
7813 | } | |
7814 | ||
7815 | if (do_reorder) | |
7816 | { | |
7817 | MOVE_FROM_FIELD_LIST_TO (gnu_tmp_bitp_list); | |
7818 | continue; | |
7819 | } | |
7820 | } | |
7821 | ||
7822 | /* No more bit-packed fields, move the existing ones to the end or | |
7823 | put them back at their original location. */ | |
7824 | else if (last_reorder_field_type == 2 || gnu_tmp_bitp_list) | |
7825 | { | |
7826 | last_reorder_field_type = 1; | |
7827 | ||
7828 | if (tmp_bitp_size != 0) | |
7829 | { | |
7830 | if (w_reorder && tmp_last_reorder_field_type < 2) | |
7831 | warn_on_field_placement (gnu_tmp_bitp_list | |
7832 | ? gnu_tmp_bitp_list : gnu_last, | |
7833 | gnat_component_list, | |
7834 | gnat_record_type, in_variant, | |
7835 | do_reorder); | |
7836 | ||
7837 | if (do_reorder) | |
7838 | gnu_bitp_list = chainon (gnu_tmp_bitp_list, gnu_bitp_list); | |
7839 | ||
7840 | gnu_tmp_bitp_list = NULL_TREE; | |
7841 | tmp_bitp_size = 0; | |
7842 | } | |
7843 | else | |
7844 | { | |
7845 | /* Rechain the temporary list in front of GNU_FIELD. */ | |
7846 | tree gnu_bitp_field = gnu_field; | |
7847 | while (gnu_tmp_bitp_list) | |
7848 | { | |
7849 | tree gnu_bitp_next = DECL_CHAIN (gnu_tmp_bitp_list); | |
7850 | DECL_CHAIN (gnu_tmp_bitp_list) = gnu_bitp_field; | |
7851 | if (gnu_last) | |
7852 | DECL_CHAIN (gnu_last) = gnu_tmp_bitp_list; | |
7853 | else | |
7854 | gnu_field_list = gnu_tmp_bitp_list; | |
7855 | gnu_bitp_field = gnu_tmp_bitp_list; | |
7856 | gnu_tmp_bitp_list = gnu_bitp_next; | |
7857 | } | |
7858 | } | |
7859 | } | |
7860 | ||
7861 | else | |
7862 | last_reorder_field_type = 1; | |
7863 | } | |
7864 | ||
ef0feeb2 | 7865 | gnu_last = gnu_field; |
a1ab4c31 AC |
7866 | } |
7867 | ||
ef0feeb2 EB |
7868 | #undef MOVE_FROM_FIELD_LIST_TO |
7869 | ||
9580628d EB |
7870 | gnu_field_list = nreverse (gnu_field_list); |
7871 | ||
5f2e59d4 | 7872 | /* If permitted, we reorder the fields as follows: |
ef0feeb2 | 7873 | |
8ab31c0c AC |
7874 | 1) all (groups of) fields whose length is fixed and multiple of a byte, |
7875 | 2) the remaining fields whose length is fixed and not multiple of a byte, | |
7876 | 3) the remaining fields whose length doesn't depend on discriminants, | |
7877 | 4) all fields whose length depends on discriminants, | |
7878 | 5) the variant part, | |
ef0feeb2 EB |
7879 | |
7880 | within the record and within each variant recursively. */ | |
a01ebdf5 EB |
7881 | |
7882 | if (w_reorder) | |
7883 | { | |
7884 | /* If we have pending bit-packed fields, warn if they would be moved | |
7885 | to after regular fields. */ | |
7886 | if (last_reorder_field_type == 2 | |
7887 | && tmp_bitp_size != 0 | |
7888 | && tmp_last_reorder_field_type < 2) | |
7889 | warn_on_field_placement (gnu_tmp_bitp_list | |
7890 | ? gnu_tmp_bitp_list : gnu_field_list, | |
7891 | gnat_component_list, gnat_record_type, | |
7892 | in_variant, do_reorder); | |
7893 | } | |
7894 | ||
8ab31c0c AC |
7895 | if (do_reorder) |
7896 | { | |
0a69d9bd EB |
7897 | /* If we have pending bit-packed fields on the temporary list, we put |
7898 | them either on the bit-packed list or back on the regular list. */ | |
8ab31c0c | 7899 | if (gnu_tmp_bitp_list) |
0a69d9bd EB |
7900 | { |
7901 | if (tmp_bitp_size != 0) | |
7902 | gnu_bitp_list = chainon (gnu_tmp_bitp_list, gnu_bitp_list); | |
7903 | else | |
7904 | gnu_field_list = chainon (gnu_tmp_bitp_list, gnu_field_list); | |
7905 | } | |
8ab31c0c AC |
7906 | |
7907 | gnu_field_list | |
7908 | = chainon (gnu_field_list, | |
7909 | chainon (gnu_bitp_list, | |
7910 | chainon (gnu_var_list, gnu_self_list))); | |
7911 | } | |
ef0feeb2 | 7912 | |
5f2e59d4 EB |
7913 | /* Otherwise, if there is an aliased field placed after a field whose length |
7914 | depends on discriminants, we put all the fields of the latter sort, last. | |
7915 | We need to do this in case an object of this record type is mutable. */ | |
7916 | else if (has_aliased_after_self_field) | |
9580628d | 7917 | gnu_field_list = chainon (gnu_field_list, gnu_self_list); |
5f2e59d4 | 7918 | |
b1a785fb EB |
7919 | /* If P_REP_LIST is nonzero, this means that we are asked to move the fields |
7920 | in our REP list to the previous level because this level needs them in | |
7921 | order to do a correct layout, i.e. avoid having overlapping fields. */ | |
7922 | if (p_gnu_rep_list && gnu_rep_list) | |
ef0feeb2 | 7923 | *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_rep_list); |
8cd28148 | 7924 | |
7d9979e6 EB |
7925 | /* Deal with the annoying case of an extension of a record with variable size |
7926 | and partial rep clause, for which the _Parent field is forced at offset 0 | |
7927 | and has variable size, which we do not support below. Note that we cannot | |
7928 | do it if the field has fixed size because we rely on the presence of the | |
7929 | REP part built below to trigger the reordering of the fields in a derived | |
7930 | record type when all the fields have a fixed position. */ | |
a1799e5e EB |
7931 | else if (gnu_rep_list |
7932 | && !DECL_CHAIN (gnu_rep_list) | |
7d9979e6 | 7933 | && TREE_CODE (DECL_SIZE (gnu_rep_list)) != INTEGER_CST |
a1799e5e EB |
7934 | && !variants_have_rep |
7935 | && first_free_pos | |
7936 | && integer_zerop (first_free_pos) | |
7937 | && integer_zerop (bit_position (gnu_rep_list))) | |
7938 | { | |
7939 | DECL_CHAIN (gnu_rep_list) = gnu_field_list; | |
7940 | gnu_field_list = gnu_rep_list; | |
7941 | gnu_rep_list = NULL_TREE; | |
7942 | } | |
7943 | ||
8cd28148 | 7944 | /* Otherwise, sort the fields by bit position and put them into their own |
b1a785fb | 7945 | record, before the others, if we also have fields without rep clause. */ |
ef0feeb2 | 7946 | else if (gnu_rep_list) |
a1ab4c31 | 7947 | { |
9580628d | 7948 | tree gnu_rep_type, gnu_rep_part; |
ef0feeb2 | 7949 | int i, len = list_length (gnu_rep_list); |
2bb1fc26 | 7950 | tree *gnu_arr = XALLOCAVEC (tree, len); |
a1ab4c31 | 7951 | |
9580628d EB |
7952 | /* If all the fields have a rep clause, we can do a flat layout. */ |
7953 | layout_with_rep = !gnu_field_list | |
7954 | && (!gnu_variant_part || variants_have_rep); | |
7955 | gnu_rep_type | |
7956 | = layout_with_rep ? gnu_record_type : make_node (RECORD_TYPE); | |
7957 | ||
ef0feeb2 | 7958 | for (gnu_field = gnu_rep_list, i = 0; |
8cd28148 | 7959 | gnu_field; |
910ad8de | 7960 | gnu_field = DECL_CHAIN (gnu_field), i++) |
a1ab4c31 AC |
7961 | gnu_arr[i] = gnu_field; |
7962 | ||
7963 | qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos); | |
7964 | ||
7965 | /* Put the fields in the list in order of increasing position, which | |
7966 | means we start from the end. */ | |
ef0feeb2 | 7967 | gnu_rep_list = NULL_TREE; |
a1ab4c31 AC |
7968 | for (i = len - 1; i >= 0; i--) |
7969 | { | |
ef0feeb2 EB |
7970 | DECL_CHAIN (gnu_arr[i]) = gnu_rep_list; |
7971 | gnu_rep_list = gnu_arr[i]; | |
a1ab4c31 AC |
7972 | DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type; |
7973 | } | |
7974 | ||
9580628d EB |
7975 | if (layout_with_rep) |
7976 | gnu_field_list = gnu_rep_list; | |
7977 | else | |
a1ab4c31 | 7978 | { |
ee45a32d EB |
7979 | TYPE_REVERSE_STORAGE_ORDER (gnu_rep_type) |
7980 | = TYPE_REVERSE_STORAGE_ORDER (gnu_record_type); | |
ef0feeb2 | 7981 | finish_record_type (gnu_rep_type, gnu_rep_list, 1, debug_info); |
b1a785fb EB |
7982 | |
7983 | /* If FIRST_FREE_POS is nonzero, we need to ensure that the fields | |
7984 | without rep clause are laid out starting from this position. | |
7985 | Therefore, we force it as a minimal size on the REP part. */ | |
7986 | gnu_rep_part | |
7987 | = create_rep_part (gnu_rep_type, gnu_record_type, first_free_pos); | |
a1ab4c31 | 7988 | |
9580628d EB |
7989 | /* Chain the REP part at the beginning of the field list. */ |
7990 | DECL_CHAIN (gnu_rep_part) = gnu_field_list; | |
7991 | gnu_field_list = gnu_rep_part; | |
7992 | } | |
b1a785fb EB |
7993 | } |
7994 | ||
9580628d | 7995 | /* Chain the variant part at the end of the field list. */ |
b1a785fb | 7996 | if (gnu_variant_part) |
9580628d | 7997 | gnu_field_list = chainon (gnu_field_list, gnu_variant_part); |
b1a785fb | 7998 | |
a1ab4c31 | 7999 | if (cancel_alignment) |
fe37c7af | 8000 | SET_TYPE_ALIGN (gnu_record_type, 0); |
a1ab4c31 | 8001 | |
fd787640 | 8002 | TYPE_ARTIFICIAL (gnu_record_type) = artificial; |
9580628d EB |
8003 | |
8004 | finish_record_type (gnu_record_type, gnu_field_list, layout_with_rep ? 1 : 0, | |
8005 | debug_info && !maybe_unused); | |
8006 | ||
6bc8df24 EB |
8007 | /* Chain the fields with zero size at the beginning of the field list. */ |
8008 | if (gnu_zero_list) | |
8009 | TYPE_FIELDS (gnu_record_type) | |
8010 | = chainon (gnu_zero_list, TYPE_FIELDS (gnu_record_type)); | |
8011 | ||
9580628d | 8012 | return (gnu_rep_list && !p_gnu_rep_list) || variants_have_rep; |
a1ab4c31 AC |
8013 | } |
8014 | \f | |
8015 | /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be | |
8016 | placed into an Esize, Component_Bit_Offset, or Component_Size value | |
8017 | in the GNAT tree. */ | |
8018 | ||
8019 | static Uint | |
8020 | annotate_value (tree gnu_size) | |
8021 | { | |
e45f84a5 | 8022 | static int var_count = 0; |
a1ab4c31 | 8023 | TCode tcode; |
e45f84a5 | 8024 | Node_Ref_Or_Val ops[3] = { No_Uint, No_Uint, No_Uint }; |
0e871c15 | 8025 | struct tree_int_map in; |
a1ab4c31 AC |
8026 | |
8027 | /* See if we've already saved the value for this node. */ | |
e45f84a5 | 8028 | if (EXPR_P (gnu_size) || DECL_P (gnu_size)) |
a1ab4c31 | 8029 | { |
0e871c15 AO |
8030 | struct tree_int_map *e; |
8031 | ||
a1ab4c31 | 8032 | in.base.from = gnu_size; |
d242408f | 8033 | e = annotate_value_cache->find (&in); |
a1ab4c31 | 8034 | |
0e871c15 AO |
8035 | if (e) |
8036 | return (Node_Ref_Or_Val) e->to; | |
a1ab4c31 | 8037 | } |
0e871c15 AO |
8038 | else |
8039 | in.base.from = NULL_TREE; | |
a1ab4c31 AC |
8040 | |
8041 | /* If we do not return inside this switch, TCODE will be set to the | |
e45f84a5 | 8042 | code to be used in a call to Create_Node. */ |
a1ab4c31 AC |
8043 | switch (TREE_CODE (gnu_size)) |
8044 | { | |
8045 | case INTEGER_CST: | |
c0c54de6 EB |
8046 | /* For negative values, build NEGATE_EXPR of the opposite. Such values |
8047 | can appear for discriminants in expressions for variants. */ | |
8048 | if (tree_int_cst_sgn (gnu_size) < 0) | |
8049 | { | |
8e6cdc90 | 8050 | tree t = wide_int_to_tree (sizetype, -wi::to_wide (gnu_size)); |
e45f84a5 EB |
8051 | tcode = Negate_Expr; |
8052 | ops[0] = UI_From_gnu (t); | |
c0c54de6 | 8053 | } |
e45f84a5 EB |
8054 | else |
8055 | return TREE_OVERFLOW (gnu_size) ? No_Uint : UI_From_gnu (gnu_size); | |
8056 | break; | |
a1ab4c31 AC |
8057 | |
8058 | case COMPONENT_REF: | |
8059 | /* The only case we handle here is a simple discriminant reference. */ | |
c19ff724 EB |
8060 | if (DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1))) |
8061 | { | |
e45f84a5 EB |
8062 | tree ref = gnu_size; |
8063 | gnu_size = TREE_OPERAND (ref, 1); | |
c19ff724 EB |
8064 | |
8065 | /* Climb up the chain of successive extensions, if any. */ | |
e45f84a5 EB |
8066 | while (TREE_CODE (TREE_OPERAND (ref, 0)) == COMPONENT_REF |
8067 | && DECL_NAME (TREE_OPERAND (TREE_OPERAND (ref, 0), 1)) | |
c19ff724 | 8068 | == parent_name_id) |
e45f84a5 | 8069 | ref = TREE_OPERAND (ref, 0); |
c19ff724 | 8070 | |
e45f84a5 EB |
8071 | if (TREE_CODE (TREE_OPERAND (ref, 0)) == PLACEHOLDER_EXPR) |
8072 | { | |
8073 | /* Fall through to common processing as a FIELD_DECL. */ | |
8074 | tcode = Discrim_Val; | |
8075 | ops[0] = UI_From_gnu (DECL_DISCRIMINANT_NUMBER (gnu_size)); | |
8076 | } | |
8077 | else | |
8078 | return No_Uint; | |
c19ff724 | 8079 | } |
e45f84a5 EB |
8080 | else |
8081 | return No_Uint; | |
8082 | break; | |
c19ff724 | 8083 | |
e45f84a5 EB |
8084 | case VAR_DECL: |
8085 | tcode = Dynamic_Val; | |
8086 | ops[0] = UI_From_Int (++var_count); | |
8087 | break; | |
a1ab4c31 | 8088 | |
e45f84a5 EB |
8089 | CASE_CONVERT: |
8090 | case NON_LVALUE_EXPR: | |
a1ab4c31 AC |
8091 | return annotate_value (TREE_OPERAND (gnu_size, 0)); |
8092 | ||
8093 | /* Now just list the operations we handle. */ | |
8094 | case COND_EXPR: tcode = Cond_Expr; break; | |
a1ab4c31 | 8095 | case MINUS_EXPR: tcode = Minus_Expr; break; |
a1ab4c31 AC |
8096 | case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break; |
8097 | case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break; | |
8098 | case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break; | |
8099 | case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break; | |
8100 | case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break; | |
8101 | case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break; | |
8102 | case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break; | |
8103 | case NEGATE_EXPR: tcode = Negate_Expr; break; | |
8104 | case MIN_EXPR: tcode = Min_Expr; break; | |
8105 | case MAX_EXPR: tcode = Max_Expr; break; | |
8106 | case ABS_EXPR: tcode = Abs_Expr; break; | |
8107 | case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break; | |
8108 | case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break; | |
8109 | case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break; | |
8110 | case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break; | |
8111 | case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break; | |
8112 | case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break; | |
a1ab4c31 AC |
8113 | case LT_EXPR: tcode = Lt_Expr; break; |
8114 | case LE_EXPR: tcode = Le_Expr; break; | |
8115 | case GT_EXPR: tcode = Gt_Expr; break; | |
8116 | case GE_EXPR: tcode = Ge_Expr; break; | |
8117 | case EQ_EXPR: tcode = Eq_Expr; break; | |
8118 | case NE_EXPR: tcode = Ne_Expr; break; | |
8119 | ||
e45f84a5 EB |
8120 | case MULT_EXPR: |
8121 | case PLUS_EXPR: | |
8122 | tcode = (TREE_CODE (gnu_size) == MULT_EXPR ? Mult_Expr : Plus_Expr); | |
8123 | /* Fold conversions from bytes to bits into inner operations. */ | |
8124 | if (TREE_CODE (TREE_OPERAND (gnu_size, 1)) == INTEGER_CST | |
8125 | && CONVERT_EXPR_P (TREE_OPERAND (gnu_size, 0))) | |
8126 | { | |
8127 | tree inner_op = TREE_OPERAND (TREE_OPERAND (gnu_size, 0), 0); | |
8128 | if (TREE_CODE (inner_op) == TREE_CODE (gnu_size) | |
8129 | && TREE_CODE (TREE_OPERAND (inner_op, 1)) == INTEGER_CST) | |
8130 | { | |
8131 | tree inner_op_op1 = TREE_OPERAND (inner_op, 1); | |
8132 | tree gnu_size_op1 = TREE_OPERAND (gnu_size, 1); | |
a1488398 | 8133 | widest_int op1; |
e45f84a5 | 8134 | if (TREE_CODE (gnu_size) == MULT_EXPR) |
a1488398 RS |
8135 | op1 = (wi::to_widest (inner_op_op1) |
8136 | * wi::to_widest (gnu_size_op1)); | |
e45f84a5 | 8137 | else |
a1488398 RS |
8138 | op1 = (wi::to_widest (inner_op_op1) |
8139 | + wi::to_widest (gnu_size_op1)); | |
e45f84a5 EB |
8140 | ops[1] = UI_From_gnu (wide_int_to_tree (sizetype, op1)); |
8141 | ops[0] = annotate_value (TREE_OPERAND (inner_op, 0)); | |
8142 | } | |
8143 | } | |
8144 | break; | |
8145 | ||
ce3da0d0 EB |
8146 | case BIT_AND_EXPR: |
8147 | tcode = Bit_And_Expr; | |
f0035dca EB |
8148 | /* For negative values in sizetype, build NEGATE_EXPR of the opposite. |
8149 | Such values appear in expressions with aligning patterns. Note that, | |
8150 | since sizetype is unsigned, we have to jump through some hoops. */ | |
ce3da0d0 EB |
8151 | if (TREE_CODE (TREE_OPERAND (gnu_size, 1)) == INTEGER_CST) |
8152 | { | |
8153 | tree op1 = TREE_OPERAND (gnu_size, 1); | |
8e6cdc90 RS |
8154 | wide_int signed_op1 = wi::sext (wi::to_wide (op1), |
8155 | TYPE_PRECISION (sizetype)); | |
f0035dca | 8156 | if (wi::neg_p (signed_op1)) |
ce3da0d0 | 8157 | { |
f0035dca | 8158 | op1 = wide_int_to_tree (sizetype, wi::neg (signed_op1)); |
e45f84a5 | 8159 | ops[1] = annotate_value (build1 (NEGATE_EXPR, sizetype, op1)); |
ce3da0d0 EB |
8160 | } |
8161 | } | |
8162 | break; | |
8163 | ||
f82a627c | 8164 | case CALL_EXPR: |
4116e7d0 EB |
8165 | /* In regular mode, inline back only if symbolic annotation is requested |
8166 | in order to avoid memory explosion on big discriminated record types. | |
8167 | But not in ASIS mode, as symbolic annotation is required for DDA. */ | |
8168 | if (List_Representation_Info == 3 || type_annotate_only) | |
8169 | { | |
8170 | tree t = maybe_inline_call_in_expr (gnu_size); | |
e45f84a5 | 8171 | return t ? annotate_value (t) : No_Uint; |
4116e7d0 EB |
8172 | } |
8173 | else | |
8174 | return Uint_Minus_1; | |
f82a627c | 8175 | |
a1ab4c31 AC |
8176 | default: |
8177 | return No_Uint; | |
8178 | } | |
8179 | ||
8180 | /* Now get each of the operands that's relevant for this code. If any | |
8181 | cannot be expressed as a repinfo node, say we can't. */ | |
e45f84a5 EB |
8182 | for (int i = 0; i < TREE_CODE_LENGTH (TREE_CODE (gnu_size)); i++) |
8183 | if (ops[i] == No_Uint) | |
8184 | { | |
ce3da0d0 | 8185 | ops[i] = annotate_value (TREE_OPERAND (gnu_size, i)); |
e45f84a5 EB |
8186 | if (ops[i] == No_Uint) |
8187 | return No_Uint; | |
8188 | } | |
a1ab4c31 | 8189 | |
e45f84a5 | 8190 | Node_Ref_Or_Val ret = Create_Node (tcode, ops[0], ops[1], ops[2]); |
a1ab4c31 AC |
8191 | |
8192 | /* Save the result in the cache. */ | |
0e871c15 | 8193 | if (in.base.from) |
a1ab4c31 | 8194 | { |
0e871c15 | 8195 | struct tree_int_map **h; |
4116e7d0 EB |
8196 | /* We can't assume the hash table data hasn't moved since the initial |
8197 | look up, so we have to search again. Allocating and inserting an | |
8198 | entry at that point would be an alternative, but then we'd better | |
8199 | discard the entry if we decided not to cache it. */ | |
d242408f | 8200 | h = annotate_value_cache->find_slot (&in, INSERT); |
0e871c15 | 8201 | gcc_assert (!*h); |
766090c2 | 8202 | *h = ggc_alloc<tree_int_map> (); |
e45f84a5 | 8203 | (*h)->base.from = in.base.from; |
a1ab4c31 AC |
8204 | (*h)->to = ret; |
8205 | } | |
8206 | ||
8207 | return ret; | |
8208 | } | |
8209 | ||
f4cd2542 EB |
8210 | /* Given GNAT_ENTITY, an object (constant, variable, parameter, exception) |
8211 | and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the | |
8212 | size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null. | |
491f54a7 | 8213 | BY_REF is true if the object is used by reference. */ |
f4cd2542 EB |
8214 | |
8215 | void | |
491f54a7 | 8216 | annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref) |
f4cd2542 EB |
8217 | { |
8218 | if (by_ref) | |
8219 | { | |
315cff15 | 8220 | if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
f4cd2542 EB |
8221 | gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type); |
8222 | else | |
8223 | gnu_type = TREE_TYPE (gnu_type); | |
8224 | } | |
8225 | ||
8226 | if (Unknown_Esize (gnat_entity)) | |
8227 | { | |
8228 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
8229 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
910ad8de | 8230 | size = TYPE_SIZE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))); |
f4cd2542 EB |
8231 | else if (!size) |
8232 | size = TYPE_SIZE (gnu_type); | |
8233 | ||
8234 | if (size) | |
8235 | Set_Esize (gnat_entity, annotate_value (size)); | |
8236 | } | |
8237 | ||
8238 | if (Unknown_Alignment (gnat_entity)) | |
8239 | Set_Alignment (gnat_entity, | |
8240 | UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); | |
8241 | } | |
8242 | ||
cb3d597d EB |
8243 | /* Return first element of field list whose TREE_PURPOSE is the same as ELEM. |
8244 | Return NULL_TREE if there is no such element in the list. */ | |
73d28034 EB |
8245 | |
8246 | static tree | |
8247 | purpose_member_field (const_tree elem, tree list) | |
8248 | { | |
8249 | while (list) | |
8250 | { | |
8251 | tree field = TREE_PURPOSE (list); | |
cb3d597d | 8252 | if (SAME_FIELD_P (field, elem)) |
73d28034 EB |
8253 | return list; |
8254 | list = TREE_CHAIN (list); | |
8255 | } | |
8256 | return NULL_TREE; | |
8257 | } | |
8258 | ||
3f13dd77 EB |
8259 | /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type, |
8260 | set Component_Bit_Offset and Esize of the components to the position and | |
8261 | size used by Gigi. */ | |
a1ab4c31 AC |
8262 | |
8263 | static void | |
8264 | annotate_rep (Entity_Id gnat_entity, tree gnu_type) | |
8265 | { | |
05dbb83f AC |
8266 | /* For an extension, the inherited components have not been translated because |
8267 | they are fetched from the _Parent component on the fly. */ | |
8268 | const bool is_extension | |
8269 | = Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity); | |
a1ab4c31 | 8270 | |
3f13dd77 EB |
8271 | /* We operate by first making a list of all fields and their position (we |
8272 | can get the size easily) and then update all the sizes in the tree. */ | |
05dbb83f | 8273 | tree gnu_list |
95c1c4bb EB |
8274 | = build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node, |
8275 | BIGGEST_ALIGNMENT, NULL_TREE); | |
a1ab4c31 | 8276 | |
05dbb83f | 8277 | for (Entity_Id gnat_field = First_Entity (gnat_entity); |
3f13dd77 | 8278 | Present (gnat_field); |
a1ab4c31 | 8279 | gnat_field = Next_Entity (gnat_field)) |
05dbb83f AC |
8280 | if ((Ekind (gnat_field) == E_Component |
8281 | && (is_extension || present_gnu_tree (gnat_field))) | |
3f13dd77 EB |
8282 | || (Ekind (gnat_field) == E_Discriminant |
8283 | && !Is_Unchecked_Union (Scope (gnat_field)))) | |
a1ab4c31 | 8284 | { |
73d28034 EB |
8285 | tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field), |
8286 | gnu_list); | |
3f13dd77 | 8287 | if (t) |
a1ab4c31 | 8288 | { |
73d28034 EB |
8289 | tree parent_offset; |
8290 | ||
b38086f0 EB |
8291 | /* If we are just annotating types and the type is tagged, the tag |
8292 | and the parent components are not generated by the front-end so | |
8293 | we need to add the appropriate offset to each component without | |
8294 | representation clause. */ | |
8295 | if (type_annotate_only | |
8296 | && Is_Tagged_Type (gnat_entity) | |
8297 | && No (Component_Clause (gnat_field))) | |
a1ab4c31 | 8298 | { |
b38086f0 EB |
8299 | /* For a component appearing in the current extension, the |
8300 | offset is the size of the parent. */ | |
3f13dd77 EB |
8301 | if (Is_Derived_Type (gnat_entity) |
8302 | && Original_Record_Component (gnat_field) == gnat_field) | |
8303 | parent_offset | |
8304 | = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))), | |
8305 | bitsizetype); | |
8306 | else | |
8307 | parent_offset = bitsize_int (POINTER_SIZE); | |
b38086f0 EB |
8308 | |
8309 | if (TYPE_FIELDS (gnu_type)) | |
8310 | parent_offset | |
8311 | = round_up (parent_offset, | |
8312 | DECL_ALIGN (TYPE_FIELDS (gnu_type))); | |
a1ab4c31 | 8313 | } |
3f13dd77 EB |
8314 | else |
8315 | parent_offset = bitsize_zero_node; | |
a1ab4c31 | 8316 | |
3f13dd77 EB |
8317 | Set_Component_Bit_Offset |
8318 | (gnat_field, | |
8319 | annotate_value | |
8320 | (size_binop (PLUS_EXPR, | |
95c1c4bb EB |
8321 | bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0), |
8322 | TREE_VEC_ELT (TREE_VALUE (t), 2)), | |
3f13dd77 | 8323 | parent_offset))); |
a1ab4c31 AC |
8324 | |
8325 | Set_Esize (gnat_field, | |
3f13dd77 | 8326 | annotate_value (DECL_SIZE (TREE_PURPOSE (t)))); |
a1ab4c31 | 8327 | } |
05dbb83f | 8328 | else if (is_extension) |
a1ab4c31 | 8329 | { |
3f13dd77 | 8330 | /* If there is no entry, this is an inherited component whose |
a1ab4c31 | 8331 | position is the same as in the parent type. */ |
c00d5b12 | 8332 | Entity_Id gnat_orig_field = Original_Record_Component (gnat_field); |
3f13dd77 | 8333 | |
c00d5b12 EB |
8334 | /* If we are just annotating types, discriminants renaming those of |
8335 | the parent have no entry so deal with them specifically. */ | |
8336 | if (type_annotate_only | |
8337 | && gnat_orig_field == gnat_field | |
8338 | && Ekind (gnat_field) == E_Discriminant) | |
8339 | gnat_orig_field = Corresponding_Discriminant (gnat_field); | |
8340 | ||
8341 | Set_Component_Bit_Offset (gnat_field, | |
8342 | Component_Bit_Offset (gnat_orig_field)); | |
8343 | ||
8344 | Set_Esize (gnat_field, Esize (gnat_orig_field)); | |
a1ab4c31 AC |
8345 | } |
8346 | } | |
8347 | } | |
3f13dd77 | 8348 | \f |
95c1c4bb EB |
8349 | /* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is |
8350 | the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the | |
8351 | value to be placed into DECL_OFFSET_ALIGN and the bit position. The list | |
8352 | of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT | |
8353 | is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the | |
8354 | bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a | |
8355 | pre-existing list to be chained to the newly created entries. */ | |
a1ab4c31 AC |
8356 | |
8357 | static tree | |
95c1c4bb EB |
8358 | build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos, |
8359 | tree gnu_bitpos, unsigned int offset_align, tree gnu_list) | |
a1ab4c31 AC |
8360 | { |
8361 | tree gnu_field; | |
a1ab4c31 | 8362 | |
3f13dd77 EB |
8363 | for (gnu_field = TYPE_FIELDS (gnu_type); |
8364 | gnu_field; | |
910ad8de | 8365 | gnu_field = DECL_CHAIN (gnu_field)) |
a1ab4c31 AC |
8366 | { |
8367 | tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos, | |
8368 | DECL_FIELD_BIT_OFFSET (gnu_field)); | |
8369 | tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos, | |
8370 | DECL_FIELD_OFFSET (gnu_field)); | |
8371 | unsigned int our_offset_align | |
8372 | = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field)); | |
95c1c4bb | 8373 | tree v = make_tree_vec (3); |
a1ab4c31 | 8374 | |
95c1c4bb EB |
8375 | TREE_VEC_ELT (v, 0) = gnu_our_offset; |
8376 | TREE_VEC_ELT (v, 1) = size_int (our_offset_align); | |
8377 | TREE_VEC_ELT (v, 2) = gnu_our_bitpos; | |
8378 | gnu_list = tree_cons (gnu_field, v, gnu_list); | |
a1ab4c31 | 8379 | |
95c1c4bb EB |
8380 | /* Recurse on internal fields, flattening the nested fields except for |
8381 | those in the variant part, if requested. */ | |
a1ab4c31 | 8382 | if (DECL_INTERNAL_P (gnu_field)) |
95c1c4bb EB |
8383 | { |
8384 | tree gnu_field_type = TREE_TYPE (gnu_field); | |
8385 | if (do_not_flatten_variant | |
8386 | && TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE) | |
8387 | gnu_list | |
8388 | = build_position_list (gnu_field_type, do_not_flatten_variant, | |
8389 | size_zero_node, bitsize_zero_node, | |
8390 | BIGGEST_ALIGNMENT, gnu_list); | |
8391 | else | |
8392 | gnu_list | |
8393 | = build_position_list (gnu_field_type, do_not_flatten_variant, | |
a1ab4c31 | 8394 | gnu_our_offset, gnu_our_bitpos, |
95c1c4bb EB |
8395 | our_offset_align, gnu_list); |
8396 | } | |
8397 | } | |
8398 | ||
8399 | return gnu_list; | |
8400 | } | |
8401 | ||
f54ee980 | 8402 | /* Return a list describing the substitutions needed to reflect the |
95c1c4bb | 8403 | discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can |
f54ee980 | 8404 | be in any order. The values in an element of the list are in the form |
e3554601 NF |
8405 | of operands to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for |
8406 | a definition of GNAT_SUBTYPE. */ | |
95c1c4bb | 8407 | |
b16b6cc9 | 8408 | static vec<subst_pair> |
95c1c4bb EB |
8409 | build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition) |
8410 | { | |
6e1aa848 | 8411 | vec<subst_pair> gnu_list = vNULL; |
95c1c4bb | 8412 | Entity_Id gnat_discrim; |
908ba941 | 8413 | Node_Id gnat_constr; |
95c1c4bb EB |
8414 | |
8415 | for (gnat_discrim = First_Stored_Discriminant (gnat_type), | |
908ba941 | 8416 | gnat_constr = First_Elmt (Stored_Constraint (gnat_subtype)); |
95c1c4bb EB |
8417 | Present (gnat_discrim); |
8418 | gnat_discrim = Next_Stored_Discriminant (gnat_discrim), | |
908ba941 | 8419 | gnat_constr = Next_Elmt (gnat_constr)) |
95c1c4bb | 8420 | /* Ignore access discriminants. */ |
908ba941 | 8421 | if (!Is_Access_Type (Etype (Node (gnat_constr)))) |
3c28a5f4 EB |
8422 | { |
8423 | tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim); | |
e3554601 NF |
8424 | tree replacement = convert (TREE_TYPE (gnu_field), |
8425 | elaborate_expression | |
908ba941 | 8426 | (Node (gnat_constr), gnat_subtype, |
bf44701f | 8427 | get_entity_char (gnat_discrim), |
e3554601 | 8428 | definition, true, false)); |
05dbb83f | 8429 | subst_pair s = { gnu_field, replacement }; |
9771b263 | 8430 | gnu_list.safe_push (s); |
3c28a5f4 | 8431 | } |
95c1c4bb | 8432 | |
f54ee980 | 8433 | return gnu_list; |
95c1c4bb EB |
8434 | } |
8435 | ||
f54ee980 | 8436 | /* Scan all fields in QUAL_UNION_TYPE and return a list describing the |
fb7fb701 | 8437 | variants of QUAL_UNION_TYPE that are still relevant after applying |
f54ee980 EB |
8438 | the substitutions described in SUBST_LIST. GNU_LIST is a pre-existing |
8439 | list to be prepended to the newly created entries. */ | |
95c1c4bb | 8440 | |
b16b6cc9 | 8441 | static vec<variant_desc> |
9771b263 DN |
8442 | build_variant_list (tree qual_union_type, vec<subst_pair> subst_list, |
8443 | vec<variant_desc> gnu_list) | |
95c1c4bb EB |
8444 | { |
8445 | tree gnu_field; | |
8446 | ||
8447 | for (gnu_field = TYPE_FIELDS (qual_union_type); | |
8448 | gnu_field; | |
910ad8de | 8449 | gnu_field = DECL_CHAIN (gnu_field)) |
95c1c4bb | 8450 | { |
e3554601 | 8451 | tree qual = DECL_QUALIFIER (gnu_field); |
f54ee980 | 8452 | unsigned int i; |
e3554601 | 8453 | subst_pair *s; |
95c1c4bb | 8454 | |
9771b263 | 8455 | FOR_EACH_VEC_ELT (subst_list, i, s) |
e3554601 | 8456 | qual = SUBSTITUTE_IN_EXPR (qual, s->discriminant, s->replacement); |
95c1c4bb EB |
8457 | |
8458 | /* If the new qualifier is not unconditionally false, its variant may | |
8459 | still be accessed. */ | |
8460 | if (!integer_zerop (qual)) | |
8461 | { | |
8462 | tree variant_type = TREE_TYPE (gnu_field), variant_subpart; | |
05dbb83f | 8463 | variant_desc v = { variant_type, gnu_field, qual, NULL_TREE }; |
fb7fb701 | 8464 | |
9771b263 | 8465 | gnu_list.safe_push (v); |
95c1c4bb EB |
8466 | |
8467 | /* Recurse on the variant subpart of the variant, if any. */ | |
8468 | variant_subpart = get_variant_part (variant_type); | |
8469 | if (variant_subpart) | |
f54ee980 EB |
8470 | gnu_list = build_variant_list (TREE_TYPE (variant_subpart), |
8471 | subst_list, gnu_list); | |
95c1c4bb EB |
8472 | |
8473 | /* If the new qualifier is unconditionally true, the subsequent | |
8474 | variants cannot be accessed. */ | |
8475 | if (integer_onep (qual)) | |
8476 | break; | |
8477 | } | |
a1ab4c31 AC |
8478 | } |
8479 | ||
f54ee980 | 8480 | return gnu_list; |
a1ab4c31 AC |
8481 | } |
8482 | \f | |
8483 | /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE | |
0d853156 EB |
8484 | corresponding to GNAT_OBJECT. If the size is valid, return an INTEGER_CST |
8485 | corresponding to its value. Otherwise, return NULL_TREE. KIND is set to | |
8486 | VAR_DECL if we are specifying the size of an object, TYPE_DECL for the | |
8487 | size of a type, and FIELD_DECL for the size of a field. COMPONENT_P is | |
8488 | true if we are being called to process the Component_Size of GNAT_OBJECT; | |
8489 | this is used only for error messages. ZERO_OK is true if a size of zero | |
8490 | is permitted; if ZERO_OK is false, it means that a size of zero should be | |
8491 | treated as an unspecified size. */ | |
a1ab4c31 AC |
8492 | |
8493 | static tree | |
8494 | validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object, | |
8495 | enum tree_code kind, bool component_p, bool zero_ok) | |
8496 | { | |
8497 | Node_Id gnat_error_node; | |
8498 | tree type_size, size; | |
8499 | ||
8ff6c664 EB |
8500 | /* Return 0 if no size was specified. */ |
8501 | if (uint_size == No_Uint) | |
8502 | return NULL_TREE; | |
a1ab4c31 | 8503 | |
728936bb EB |
8504 | /* Ignore a negative size since that corresponds to our back-annotation. */ |
8505 | if (UI_Lt (uint_size, Uint_0)) | |
8506 | return NULL_TREE; | |
8507 | ||
0d853156 | 8508 | /* Find the node to use for error messages. */ |
a1ab4c31 AC |
8509 | if ((Ekind (gnat_object) == E_Component |
8510 | || Ekind (gnat_object) == E_Discriminant) | |
8511 | && Present (Component_Clause (gnat_object))) | |
8512 | gnat_error_node = Last_Bit (Component_Clause (gnat_object)); | |
8513 | else if (Present (Size_Clause (gnat_object))) | |
8514 | gnat_error_node = Expression (Size_Clause (gnat_object)); | |
8515 | else | |
8516 | gnat_error_node = gnat_object; | |
8517 | ||
0d853156 EB |
8518 | /* Get the size as an INTEGER_CST. Issue an error if a size was specified |
8519 | but cannot be represented in bitsizetype. */ | |
a1ab4c31 AC |
8520 | size = UI_To_gnu (uint_size, bitsizetype); |
8521 | if (TREE_OVERFLOW (size)) | |
8522 | { | |
8ff6c664 | 8523 | if (component_p) |
0d853156 | 8524 | post_error_ne ("component size for& is too large", gnat_error_node, |
8ff6c664 EB |
8525 | gnat_object); |
8526 | else | |
0d853156 | 8527 | post_error_ne ("size for& is too large", gnat_error_node, |
8ff6c664 | 8528 | gnat_object); |
a1ab4c31 AC |
8529 | return NULL_TREE; |
8530 | } | |
8531 | ||
728936bb EB |
8532 | /* Ignore a zero size if it is not permitted. */ |
8533 | if (!zero_ok && integer_zerop (size)) | |
a1ab4c31 AC |
8534 | return NULL_TREE; |
8535 | ||
8536 | /* The size of objects is always a multiple of a byte. */ | |
8537 | if (kind == VAR_DECL | |
8538 | && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node))) | |
8539 | { | |
8540 | if (component_p) | |
8541 | post_error_ne ("component size for& is not a multiple of Storage_Unit", | |
8542 | gnat_error_node, gnat_object); | |
8543 | else | |
8544 | post_error_ne ("size for& is not a multiple of Storage_Unit", | |
8545 | gnat_error_node, gnat_object); | |
8546 | return NULL_TREE; | |
8547 | } | |
8548 | ||
8549 | /* If this is an integral type or a packed array type, the front-end has | |
0d853156 | 8550 | already verified the size, so we need not do it here (which would mean |
a8e05f92 EB |
8551 | checking against the bounds). However, if this is an aliased object, |
8552 | it may not be smaller than the type of the object. */ | |
a1ab4c31 AC |
8553 | if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type)) |
8554 | && !(kind == VAR_DECL && Is_Aliased (gnat_object))) | |
8555 | return size; | |
8556 | ||
0d853156 EB |
8557 | /* If the object is a record that contains a template, add the size of the |
8558 | template to the specified size. */ | |
a1ab4c31 AC |
8559 | if (TREE_CODE (gnu_type) == RECORD_TYPE |
8560 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
8561 | size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size); | |
8562 | ||
8ff6c664 EB |
8563 | if (kind == VAR_DECL |
8564 | /* If a type needs strict alignment, a component of this type in | |
8565 | a packed record cannot be packed and thus uses the type size. */ | |
8566 | || (kind == TYPE_DECL && Strict_Alignment (gnat_object))) | |
8567 | type_size = TYPE_SIZE (gnu_type); | |
8568 | else | |
8569 | type_size = rm_size (gnu_type); | |
8570 | ||
0d853156 | 8571 | /* Modify the size of a discriminated type to be the maximum size. */ |
a1ab4c31 AC |
8572 | if (type_size && CONTAINS_PLACEHOLDER_P (type_size)) |
8573 | type_size = max_size (type_size, true); | |
8574 | ||
8575 | /* If this is an access type or a fat pointer, the minimum size is that given | |
8576 | by the smallest integral mode that's valid for pointers. */ | |
315cff15 | 8577 | if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type)) |
a1ab4c31 | 8578 | { |
e72b0ef4 | 8579 | scalar_int_mode p_mode = NARROWEST_INT_MODE; |
8ff6c664 | 8580 | while (!targetm.valid_pointer_mode (p_mode)) |
490d0f6c | 8581 | p_mode = GET_MODE_WIDER_MODE (p_mode).require (); |
a1ab4c31 AC |
8582 | type_size = bitsize_int (GET_MODE_BITSIZE (p_mode)); |
8583 | } | |
8584 | ||
0d853156 EB |
8585 | /* Issue an error either if the default size of the object isn't a constant |
8586 | or if the new size is smaller than it. */ | |
a1ab4c31 AC |
8587 | if (TREE_CODE (type_size) != INTEGER_CST |
8588 | || TREE_OVERFLOW (type_size) | |
8589 | || tree_int_cst_lt (size, type_size)) | |
8590 | { | |
8591 | if (component_p) | |
8592 | post_error_ne_tree | |
8593 | ("component size for& too small{, minimum allowed is ^}", | |
8594 | gnat_error_node, gnat_object, type_size); | |
8595 | else | |
8ff6c664 EB |
8596 | post_error_ne_tree |
8597 | ("size for& too small{, minimum allowed is ^}", | |
8598 | gnat_error_node, gnat_object, type_size); | |
0d853156 | 8599 | return NULL_TREE; |
a1ab4c31 AC |
8600 | } |
8601 | ||
8602 | return size; | |
8603 | } | |
8604 | \f | |
0d853156 EB |
8605 | /* Similarly, but both validate and process a value of RM size. This routine |
8606 | is only called for types. */ | |
a1ab4c31 AC |
8607 | |
8608 | static void | |
8609 | set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity) | |
8610 | { | |
8ff6c664 EB |
8611 | Node_Id gnat_attr_node; |
8612 | tree old_size, size; | |
8613 | ||
8614 | /* Do nothing if no size was specified. */ | |
8615 | if (uint_size == No_Uint) | |
8616 | return; | |
8617 | ||
728936bb EB |
8618 | /* Ignore a negative size since that corresponds to our back-annotation. */ |
8619 | if (UI_Lt (uint_size, Uint_0)) | |
8620 | return; | |
8621 | ||
a8e05f92 | 8622 | /* Only issue an error if a Value_Size clause was explicitly given. |
a1ab4c31 | 8623 | Otherwise, we'd be duplicating an error on the Size clause. */ |
8ff6c664 | 8624 | gnat_attr_node |
a1ab4c31 | 8625 | = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size); |
a1ab4c31 | 8626 | |
0d853156 EB |
8627 | /* Get the size as an INTEGER_CST. Issue an error if a size was specified |
8628 | but cannot be represented in bitsizetype. */ | |
a1ab4c31 AC |
8629 | size = UI_To_gnu (uint_size, bitsizetype); |
8630 | if (TREE_OVERFLOW (size)) | |
8631 | { | |
8632 | if (Present (gnat_attr_node)) | |
0d853156 | 8633 | post_error_ne ("Value_Size for& is too large", gnat_attr_node, |
a1ab4c31 | 8634 | gnat_entity); |
a1ab4c31 AC |
8635 | return; |
8636 | } | |
8637 | ||
728936bb EB |
8638 | /* Ignore a zero size unless a Value_Size clause exists, or a size clause |
8639 | exists, or this is an integer type, in which case the front-end will | |
8640 | have always set it. */ | |
8641 | if (No (gnat_attr_node) | |
8642 | && integer_zerop (size) | |
8643 | && !Has_Size_Clause (gnat_entity) | |
8644 | && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) | |
a1ab4c31 AC |
8645 | return; |
8646 | ||
8ff6c664 EB |
8647 | old_size = rm_size (gnu_type); |
8648 | ||
a1ab4c31 AC |
8649 | /* If the old size is self-referential, get the maximum size. */ |
8650 | if (CONTAINS_PLACEHOLDER_P (old_size)) | |
8651 | old_size = max_size (old_size, true); | |
8652 | ||
0d853156 EB |
8653 | /* Issue an error either if the old size of the object isn't a constant or |
8654 | if the new size is smaller than it. The front-end has already verified | |
8655 | this for scalar and packed array types. */ | |
a1ab4c31 AC |
8656 | if (TREE_CODE (old_size) != INTEGER_CST |
8657 | || TREE_OVERFLOW (old_size) | |
03049a4e EB |
8658 | || (AGGREGATE_TYPE_P (gnu_type) |
8659 | && !(TREE_CODE (gnu_type) == ARRAY_TYPE | |
8660 | && TYPE_PACKED_ARRAY_TYPE_P (gnu_type)) | |
315cff15 | 8661 | && !(TYPE_IS_PADDING_P (gnu_type) |
03049a4e | 8662 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE |
58c8f770 EB |
8663 | && TYPE_PACKED_ARRAY_TYPE_P |
8664 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))) | |
03049a4e | 8665 | && tree_int_cst_lt (size, old_size))) |
a1ab4c31 AC |
8666 | { |
8667 | if (Present (gnat_attr_node)) | |
8668 | post_error_ne_tree | |
8669 | ("Value_Size for& too small{, minimum allowed is ^}", | |
8670 | gnat_attr_node, gnat_entity, old_size); | |
a1ab4c31 AC |
8671 | return; |
8672 | } | |
8673 | ||
e6e15ec9 | 8674 | /* Otherwise, set the RM size proper for integral types... */ |
b4680ca1 EB |
8675 | if ((TREE_CODE (gnu_type) == INTEGER_TYPE |
8676 | && Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) | |
8677 | || (TREE_CODE (gnu_type) == ENUMERAL_TYPE | |
8678 | || TREE_CODE (gnu_type) == BOOLEAN_TYPE)) | |
84fb43a1 | 8679 | SET_TYPE_RM_SIZE (gnu_type, size); |
b4680ca1 EB |
8680 | |
8681 | /* ...or the Ada size for record and union types. */ | |
e1e5852c | 8682 | else if (RECORD_OR_UNION_TYPE_P (gnu_type) |
315cff15 | 8683 | && !TYPE_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
8684 | SET_TYPE_ADA_SIZE (gnu_type, size); |
8685 | } | |
8686 | \f | |
a1ab4c31 AC |
8687 | /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY, |
8688 | a type or object whose present alignment is ALIGN. If this alignment is | |
8689 | valid, return it. Otherwise, give an error and return ALIGN. */ | |
8690 | ||
8691 | static unsigned int | |
8692 | validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align) | |
8693 | { | |
8694 | unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment (); | |
8695 | unsigned int new_align; | |
8696 | Node_Id gnat_error_node; | |
8697 | ||
8698 | /* Don't worry about checking alignment if alignment was not specified | |
8699 | by the source program and we already posted an error for this entity. */ | |
8700 | if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity)) | |
8701 | return align; | |
8702 | ||
ec88784d AC |
8703 | /* Post the error on the alignment clause if any. Note, for the implicit |
8704 | base type of an array type, the alignment clause is on the first | |
8705 | subtype. */ | |
a1ab4c31 AC |
8706 | if (Present (Alignment_Clause (gnat_entity))) |
8707 | gnat_error_node = Expression (Alignment_Clause (gnat_entity)); | |
ec88784d AC |
8708 | |
8709 | else if (Is_Itype (gnat_entity) | |
8710 | && Is_Array_Type (gnat_entity) | |
8711 | && Etype (gnat_entity) == gnat_entity | |
8712 | && Present (Alignment_Clause (First_Subtype (gnat_entity)))) | |
8713 | gnat_error_node = | |
8714 | Expression (Alignment_Clause (First_Subtype (gnat_entity))); | |
8715 | ||
a1ab4c31 AC |
8716 | else |
8717 | gnat_error_node = gnat_entity; | |
8718 | ||
8719 | /* Within GCC, an alignment is an integer, so we must make sure a value is | |
8720 | specified that fits in that range. Also, there is an upper bound to | |
8721 | alignments we can support/allow. */ | |
8722 | if (!UI_Is_In_Int_Range (alignment) | |
8723 | || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment)) | |
8724 | post_error_ne_num ("largest supported alignment for& is ^", | |
8725 | gnat_error_node, gnat_entity, max_allowed_alignment); | |
8726 | else if (!(Present (Alignment_Clause (gnat_entity)) | |
8727 | && From_At_Mod (Alignment_Clause (gnat_entity))) | |
8728 | && new_align * BITS_PER_UNIT < align) | |
caa9d12a EB |
8729 | { |
8730 | unsigned int double_align; | |
8731 | bool is_capped_double, align_clause; | |
8732 | ||
8733 | /* If the default alignment of "double" or larger scalar types is | |
8734 | specifically capped and the new alignment is above the cap, do | |
8735 | not post an error and change the alignment only if there is an | |
8736 | alignment clause; this makes it possible to have the associated | |
8737 | GCC type overaligned by default for performance reasons. */ | |
8738 | if ((double_align = double_float_alignment) > 0) | |
8739 | { | |
8740 | Entity_Id gnat_type | |
8741 | = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); | |
8742 | is_capped_double | |
8743 | = is_double_float_or_array (gnat_type, &align_clause); | |
8744 | } | |
8745 | else if ((double_align = double_scalar_alignment) > 0) | |
8746 | { | |
8747 | Entity_Id gnat_type | |
8748 | = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); | |
8749 | is_capped_double | |
8750 | = is_double_scalar_or_array (gnat_type, &align_clause); | |
8751 | } | |
8752 | else | |
8753 | is_capped_double = align_clause = false; | |
8754 | ||
8755 | if (is_capped_double && new_align >= double_align) | |
8756 | { | |
8757 | if (align_clause) | |
8758 | align = new_align * BITS_PER_UNIT; | |
8759 | } | |
8760 | else | |
8761 | { | |
8762 | if (is_capped_double) | |
8763 | align = double_align * BITS_PER_UNIT; | |
8764 | ||
8765 | post_error_ne_num ("alignment for& must be at least ^", | |
8766 | gnat_error_node, gnat_entity, | |
8767 | align / BITS_PER_UNIT); | |
8768 | } | |
8769 | } | |
a1ab4c31 AC |
8770 | else |
8771 | { | |
8772 | new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1); | |
8773 | if (new_align > align) | |
8774 | align = new_align; | |
8775 | } | |
8776 | ||
8777 | return align; | |
8778 | } | |
a1ab4c31 | 8779 | \f |
89ec98ed EB |
8780 | /* Promote the alignment of GNU_TYPE corresponding to GNAT_ENTITY. Return |
8781 | a positive value on success or zero on failure. */ | |
8782 | ||
8783 | static unsigned int | |
8784 | promote_object_alignment (tree gnu_type, Entity_Id gnat_entity) | |
8785 | { | |
8786 | unsigned int align, size_cap, align_cap; | |
8787 | ||
8788 | /* No point in promoting the alignment if this doesn't prevent BLKmode access | |
8789 | to the object, in particular block copy, as this will for example disable | |
8790 | the NRV optimization for it. No point in jumping through all the hoops | |
8791 | needed in order to support BIGGEST_ALIGNMENT if we don't really have to. | |
8792 | So we cap to the smallest alignment that corresponds to a known efficient | |
8793 | memory access pattern, except for Atomic and Volatile_Full_Access. */ | |
8794 | if (Is_Atomic_Or_VFA (gnat_entity)) | |
8795 | { | |
8796 | size_cap = UINT_MAX; | |
8797 | align_cap = BIGGEST_ALIGNMENT; | |
8798 | } | |
8799 | else | |
8800 | { | |
8801 | size_cap = MAX_FIXED_MODE_SIZE; | |
8802 | align_cap = get_mode_alignment (ptr_mode); | |
8803 | } | |
8804 | ||
8805 | /* Do the promotion within the above limits. */ | |
8806 | if (!tree_fits_uhwi_p (TYPE_SIZE (gnu_type)) | |
8807 | || compare_tree_int (TYPE_SIZE (gnu_type), size_cap) > 0) | |
8808 | align = 0; | |
8809 | else if (compare_tree_int (TYPE_SIZE (gnu_type), align_cap) > 0) | |
8810 | align = align_cap; | |
8811 | else | |
8812 | align = ceil_pow2 (tree_to_uhwi (TYPE_SIZE (gnu_type))); | |
8813 | ||
8814 | /* But make sure not to under-align the object. */ | |
8815 | if (align <= TYPE_ALIGN (gnu_type)) | |
8816 | align = 0; | |
8817 | ||
8818 | /* And honor the minimum valid atomic alignment, if any. */ | |
8819 | #ifdef MINIMUM_ATOMIC_ALIGNMENT | |
8820 | else if (align < MINIMUM_ATOMIC_ALIGNMENT) | |
8821 | align = MINIMUM_ATOMIC_ALIGNMENT; | |
8822 | #endif | |
8823 | ||
8824 | return align; | |
8825 | } | |
8826 | \f | |
86a8ba5b EB |
8827 | /* Verify that TYPE is something we can implement atomically. If not, issue |
8828 | an error for GNAT_ENTITY. COMPONENT_P is true if we are being called to | |
8829 | process a component type. */ | |
a1ab4c31 AC |
8830 | |
8831 | static void | |
86a8ba5b | 8832 | check_ok_for_atomic_type (tree type, Entity_Id gnat_entity, bool component_p) |
a1ab4c31 AC |
8833 | { |
8834 | Node_Id gnat_error_point = gnat_entity; | |
8835 | Node_Id gnat_node; | |
ef4bddc2 | 8836 | machine_mode mode; |
86a8ba5b | 8837 | enum mode_class mclass; |
a1ab4c31 AC |
8838 | unsigned int align; |
8839 | tree size; | |
8840 | ||
86a8ba5b EB |
8841 | /* If this is an anonymous base type, nothing to check, the error will be |
8842 | reported on the source type if need be. */ | |
8843 | if (!Comes_From_Source (gnat_entity)) | |
8844 | return; | |
a1ab4c31 | 8845 | |
86a8ba5b EB |
8846 | mode = TYPE_MODE (type); |
8847 | mclass = GET_MODE_CLASS (mode); | |
8848 | align = TYPE_ALIGN (type); | |
8849 | size = TYPE_SIZE (type); | |
8850 | ||
8851 | /* Consider all aligned floating-point types atomic and any aligned types | |
8852 | that are represented by integers no wider than a machine word. */ | |
b0567726 | 8853 | scalar_int_mode int_mode; |
86a8ba5b | 8854 | if ((mclass == MODE_FLOAT |
b0567726 RS |
8855 | || (is_a <scalar_int_mode> (mode, &int_mode) |
8856 | && GET_MODE_BITSIZE (int_mode) <= BITS_PER_WORD)) | |
86a8ba5b | 8857 | && align >= GET_MODE_ALIGNMENT (mode)) |
a1ab4c31 AC |
8858 | return; |
8859 | ||
86a8ba5b EB |
8860 | /* For the moment, also allow anything that has an alignment equal to its |
8861 | size and which is smaller than a word. */ | |
8862 | if (size | |
8863 | && TREE_CODE (size) == INTEGER_CST | |
a1ab4c31 AC |
8864 | && compare_tree_int (size, align) == 0 |
8865 | && align <= BITS_PER_WORD) | |
8866 | return; | |
8867 | ||
86a8ba5b EB |
8868 | for (gnat_node = First_Rep_Item (gnat_entity); |
8869 | Present (gnat_node); | |
a1ab4c31 | 8870 | gnat_node = Next_Rep_Item (gnat_node)) |
86a8ba5b EB |
8871 | if (Nkind (gnat_node) == N_Pragma) |
8872 | { | |
8873 | unsigned char pragma_id | |
8874 | = Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))); | |
8875 | ||
8876 | if ((pragma_id == Pragma_Atomic && !component_p) | |
8877 | || (pragma_id == Pragma_Atomic_Components && component_p)) | |
8878 | { | |
8879 | gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); | |
8880 | break; | |
8881 | } | |
8882 | } | |
a1ab4c31 | 8883 | |
86a8ba5b | 8884 | if (component_p) |
a1ab4c31 AC |
8885 | post_error_ne ("atomic access to component of & cannot be guaranteed", |
8886 | gnat_error_point, gnat_entity); | |
f797c2b7 EB |
8887 | else if (Is_Volatile_Full_Access (gnat_entity)) |
8888 | post_error_ne ("volatile full access to & cannot be guaranteed", | |
8889 | gnat_error_point, gnat_entity); | |
a1ab4c31 AC |
8890 | else |
8891 | post_error_ne ("atomic access to & cannot be guaranteed", | |
8892 | gnat_error_point, gnat_entity); | |
8893 | } | |
8894 | \f | |
a1ab4c31 | 8895 | |
1515785d OH |
8896 | /* Helper for the intrin compatibility checks family. Evaluate whether |
8897 | two types are definitely incompatible. */ | |
a1ab4c31 | 8898 | |
1515785d OH |
8899 | static bool |
8900 | intrin_types_incompatible_p (tree t1, tree t2) | |
8901 | { | |
8902 | enum tree_code code; | |
8903 | ||
8904 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
8905 | return false; | |
8906 | ||
8907 | if (TYPE_MODE (t1) != TYPE_MODE (t2)) | |
8908 | return true; | |
8909 | ||
8910 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
8911 | return true; | |
8912 | ||
8913 | code = TREE_CODE (t1); | |
8914 | ||
8915 | switch (code) | |
8916 | { | |
8917 | case INTEGER_TYPE: | |
8918 | case REAL_TYPE: | |
8919 | return TYPE_PRECISION (t1) != TYPE_PRECISION (t2); | |
8920 | ||
8921 | case POINTER_TYPE: | |
8922 | case REFERENCE_TYPE: | |
8923 | /* Assume designated types are ok. We'd need to account for char * and | |
8924 | void * variants to do better, which could rapidly get messy and isn't | |
8925 | clearly worth the effort. */ | |
8926 | return false; | |
8927 | ||
8928 | default: | |
8929 | break; | |
8930 | } | |
8931 | ||
8932 | return false; | |
8933 | } | |
8934 | ||
8935 | /* Helper for intrin_profiles_compatible_p, to perform compatibility checks | |
8936 | on the Ada/builtin argument lists for the INB binding. */ | |
8937 | ||
8938 | static bool | |
8939 | intrin_arglists_compatible_p (intrin_binding_t * inb) | |
a1ab4c31 | 8940 | { |
d7d058c5 NF |
8941 | function_args_iterator ada_iter, btin_iter; |
8942 | ||
8943 | function_args_iter_init (&ada_iter, inb->ada_fntype); | |
8944 | function_args_iter_init (&btin_iter, inb->btin_fntype); | |
1515785d OH |
8945 | |
8946 | /* Sequence position of the last argument we checked. */ | |
8947 | int argpos = 0; | |
8948 | ||
7c775aca | 8949 | while (true) |
1515785d | 8950 | { |
d7d058c5 NF |
8951 | tree ada_type = function_args_iter_cond (&ada_iter); |
8952 | tree btin_type = function_args_iter_cond (&btin_iter); | |
8953 | ||
8954 | /* If we've exhausted both lists simultaneously, we're done. */ | |
7c775aca | 8955 | if (!ada_type && !btin_type) |
d7d058c5 | 8956 | break; |
1515785d OH |
8957 | |
8958 | /* If one list is shorter than the other, they fail to match. */ | |
7c775aca | 8959 | if (!ada_type || !btin_type) |
1515785d OH |
8960 | return false; |
8961 | ||
1515785d | 8962 | /* If we're done with the Ada args and not with the internal builtin |
bb511fbd | 8963 | args, or the other way around, complain. */ |
1515785d OH |
8964 | if (ada_type == void_type_node |
8965 | && btin_type != void_type_node) | |
8966 | { | |
8967 | post_error ("?Ada arguments list too short!", inb->gnat_entity); | |
8968 | return false; | |
8969 | } | |
8970 | ||
1515785d OH |
8971 | if (btin_type == void_type_node |
8972 | && ada_type != void_type_node) | |
8973 | { | |
bb511fbd OH |
8974 | post_error_ne_num ("?Ada arguments list too long ('> ^)!", |
8975 | inb->gnat_entity, inb->gnat_entity, argpos); | |
8976 | return false; | |
1515785d OH |
8977 | } |
8978 | ||
8979 | /* Otherwise, check that types match for the current argument. */ | |
8980 | argpos ++; | |
8981 | if (intrin_types_incompatible_p (ada_type, btin_type)) | |
8982 | { | |
8983 | post_error_ne_num ("?intrinsic binding type mismatch on argument ^!", | |
8984 | inb->gnat_entity, inb->gnat_entity, argpos); | |
8985 | return false; | |
8986 | } | |
8987 | ||
f620bd21 | 8988 | |
d7d058c5 NF |
8989 | function_args_iter_next (&ada_iter); |
8990 | function_args_iter_next (&btin_iter); | |
1515785d OH |
8991 | } |
8992 | ||
8993 | return true; | |
8994 | } | |
8995 | ||
8996 | /* Helper for intrin_profiles_compatible_p, to perform compatibility checks | |
8997 | on the Ada/builtin return values for the INB binding. */ | |
8998 | ||
8999 | static bool | |
9000 | intrin_return_compatible_p (intrin_binding_t * inb) | |
9001 | { | |
9002 | tree ada_return_type = TREE_TYPE (inb->ada_fntype); | |
9003 | tree btin_return_type = TREE_TYPE (inb->btin_fntype); | |
9004 | ||
bb511fbd | 9005 | /* Accept function imported as procedure, common and convenient. */ |
1515785d OH |
9006 | if (VOID_TYPE_P (ada_return_type) |
9007 | && !VOID_TYPE_P (btin_return_type)) | |
bb511fbd | 9008 | return true; |
1515785d | 9009 | |
bb511fbd OH |
9010 | /* Check return types compatibility otherwise. Note that this |
9011 | handles void/void as well. */ | |
1515785d OH |
9012 | if (intrin_types_incompatible_p (btin_return_type, ada_return_type)) |
9013 | { | |
9014 | post_error ("?intrinsic binding type mismatch on return value!", | |
9015 | inb->gnat_entity); | |
9016 | return false; | |
9017 | } | |
9018 | ||
9019 | return true; | |
9020 | } | |
9021 | ||
9022 | /* Check and return whether the Ada and gcc builtin profiles bound by INB are | |
9023 | compatible. Issue relevant warnings when they are not. | |
9024 | ||
9025 | This is intended as a light check to diagnose the most obvious cases, not | |
308e6f3a | 9026 | as a full fledged type compatibility predicate. It is the programmer's |
1515785d OH |
9027 | responsibility to ensure correctness of the Ada declarations in Imports, |
9028 | especially when binding straight to a compiler internal. */ | |
9029 | ||
9030 | static bool | |
9031 | intrin_profiles_compatible_p (intrin_binding_t * inb) | |
9032 | { | |
9033 | /* Check compatibility on return values and argument lists, each responsible | |
9034 | for posting warnings as appropriate. Ensure use of the proper sloc for | |
9035 | this purpose. */ | |
9036 | ||
9037 | bool arglists_compatible_p, return_compatible_p; | |
9038 | location_t saved_location = input_location; | |
9039 | ||
9040 | Sloc_to_locus (Sloc (inb->gnat_entity), &input_location); | |
a1ab4c31 | 9041 | |
1515785d OH |
9042 | return_compatible_p = intrin_return_compatible_p (inb); |
9043 | arglists_compatible_p = intrin_arglists_compatible_p (inb); | |
a1ab4c31 | 9044 | |
1515785d | 9045 | input_location = saved_location; |
a1ab4c31 | 9046 | |
1515785d | 9047 | return return_compatible_p && arglists_compatible_p; |
a1ab4c31 AC |
9048 | } |
9049 | \f | |
95c1c4bb EB |
9050 | /* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type |
9051 | and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the | |
9052 | specified size for this field. POS_LIST is a position list describing | |
9053 | the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied | |
9054 | to this layout. */ | |
9055 | ||
9056 | static tree | |
9057 | create_field_decl_from (tree old_field, tree field_type, tree record_type, | |
e3554601 | 9058 | tree size, tree pos_list, |
9771b263 | 9059 | vec<subst_pair> subst_list) |
95c1c4bb EB |
9060 | { |
9061 | tree t = TREE_VALUE (purpose_member (old_field, pos_list)); | |
9062 | tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2); | |
ae7e9ddd | 9063 | unsigned int offset_align = tree_to_uhwi (TREE_VEC_ELT (t, 1)); |
95c1c4bb | 9064 | tree new_pos, new_field; |
f54ee980 | 9065 | unsigned int i; |
e3554601 | 9066 | subst_pair *s; |
95c1c4bb EB |
9067 | |
9068 | if (CONTAINS_PLACEHOLDER_P (pos)) | |
9771b263 | 9069 | FOR_EACH_VEC_ELT (subst_list, i, s) |
e3554601 | 9070 | pos = SUBSTITUTE_IN_EXPR (pos, s->discriminant, s->replacement); |
95c1c4bb EB |
9071 | |
9072 | /* If the position is now a constant, we can set it as the position of the | |
9073 | field when we make it. Otherwise, we need to deal with it specially. */ | |
9074 | if (TREE_CONSTANT (pos)) | |
9075 | new_pos = bit_from_pos (pos, bitpos); | |
9076 | else | |
9077 | new_pos = NULL_TREE; | |
9078 | ||
9079 | new_field | |
9080 | = create_field_decl (DECL_NAME (old_field), field_type, record_type, | |
da01bfee | 9081 | size, new_pos, DECL_PACKED (old_field), |
95c1c4bb EB |
9082 | !DECL_NONADDRESSABLE_P (old_field)); |
9083 | ||
9084 | if (!new_pos) | |
9085 | { | |
9086 | normalize_offset (&pos, &bitpos, offset_align); | |
cb27986c EB |
9087 | /* Finalize the position. */ |
9088 | DECL_FIELD_OFFSET (new_field) = variable_size (pos); | |
95c1c4bb EB |
9089 | DECL_FIELD_BIT_OFFSET (new_field) = bitpos; |
9090 | SET_DECL_OFFSET_ALIGN (new_field, offset_align); | |
9091 | DECL_SIZE (new_field) = size; | |
9092 | DECL_SIZE_UNIT (new_field) | |
9093 | = convert (sizetype, | |
9094 | size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node)); | |
9095 | layout_decl (new_field, DECL_OFFSET_ALIGN (new_field)); | |
9096 | } | |
9097 | ||
9098 | DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); | |
cb3d597d | 9099 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field); |
95c1c4bb EB |
9100 | DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field); |
9101 | TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field); | |
9102 | ||
9103 | return new_field; | |
9104 | } | |
9105 | ||
b1a785fb EB |
9106 | /* Create the REP part of RECORD_TYPE with REP_TYPE. If MIN_SIZE is nonzero, |
9107 | it is the minimal size the REP_PART must have. */ | |
9108 | ||
9109 | static tree | |
9110 | create_rep_part (tree rep_type, tree record_type, tree min_size) | |
9111 | { | |
9112 | tree field; | |
9113 | ||
9114 | if (min_size && !tree_int_cst_lt (TYPE_SIZE (rep_type), min_size)) | |
9115 | min_size = NULL_TREE; | |
9116 | ||
9117 | field = create_field_decl (get_identifier ("REP"), rep_type, record_type, | |
9580628d | 9118 | min_size, NULL_TREE, 0, 1); |
b1a785fb EB |
9119 | DECL_INTERNAL_P (field) = 1; |
9120 | ||
9121 | return field; | |
9122 | } | |
9123 | ||
95c1c4bb EB |
9124 | /* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */ |
9125 | ||
9126 | static tree | |
9127 | get_rep_part (tree record_type) | |
9128 | { | |
9129 | tree field = TYPE_FIELDS (record_type); | |
9130 | ||
9131 | /* The REP part is the first field, internal, another record, and its name | |
b1a785fb | 9132 | starts with an 'R'. */ |
638eeae8 EB |
9133 | if (field |
9134 | && DECL_INTERNAL_P (field) | |
95c1c4bb | 9135 | && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE |
b1a785fb | 9136 | && IDENTIFIER_POINTER (DECL_NAME (field)) [0] == 'R') |
95c1c4bb EB |
9137 | return field; |
9138 | ||
9139 | return NULL_TREE; | |
9140 | } | |
9141 | ||
9142 | /* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */ | |
9143 | ||
805e60a0 | 9144 | tree |
95c1c4bb EB |
9145 | get_variant_part (tree record_type) |
9146 | { | |
9147 | tree field; | |
9148 | ||
9149 | /* The variant part is the only internal field that is a qualified union. */ | |
910ad8de | 9150 | for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field)) |
95c1c4bb EB |
9151 | if (DECL_INTERNAL_P (field) |
9152 | && TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE) | |
9153 | return field; | |
9154 | ||
9155 | return NULL_TREE; | |
9156 | } | |
9157 | ||
9158 | /* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is | |
9159 | the list of variants to be used and RECORD_TYPE is the type of the parent. | |
9160 | POS_LIST is a position list describing the layout of fields present in | |
9161 | OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this | |
05dbb83f | 9162 | layout. DEBUG_INFO_P is true if we need to write debug information. */ |
95c1c4bb EB |
9163 | |
9164 | static tree | |
fb7fb701 | 9165 | create_variant_part_from (tree old_variant_part, |
9771b263 | 9166 | vec<variant_desc> variant_list, |
e3554601 | 9167 | tree record_type, tree pos_list, |
05dbb83f AC |
9168 | vec<subst_pair> subst_list, |
9169 | bool debug_info_p) | |
95c1c4bb EB |
9170 | { |
9171 | tree offset = DECL_FIELD_OFFSET (old_variant_part); | |
95c1c4bb | 9172 | tree old_union_type = TREE_TYPE (old_variant_part); |
fb7fb701 | 9173 | tree new_union_type, new_variant_part; |
95c1c4bb | 9174 | tree union_field_list = NULL_TREE; |
fb7fb701 | 9175 | variant_desc *v; |
f54ee980 | 9176 | unsigned int i; |
95c1c4bb EB |
9177 | |
9178 | /* First create the type of the variant part from that of the old one. */ | |
9179 | new_union_type = make_node (QUAL_UNION_TYPE); | |
82ea8185 EB |
9180 | TYPE_NAME (new_union_type) |
9181 | = concat_name (TYPE_NAME (record_type), | |
9182 | IDENTIFIER_POINTER (DECL_NAME (old_variant_part))); | |
95c1c4bb EB |
9183 | |
9184 | /* If the position of the variant part is constant, subtract it from the | |
9185 | size of the type of the parent to get the new size. This manual CSE | |
9186 | reduces the code size when not optimizing. */ | |
05dbb83f AC |
9187 | if (TREE_CODE (offset) == INTEGER_CST |
9188 | && TYPE_SIZE (record_type) | |
9189 | && TYPE_SIZE_UNIT (record_type)) | |
95c1c4bb | 9190 | { |
da01bfee | 9191 | tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part); |
95c1c4bb EB |
9192 | tree first_bit = bit_from_pos (offset, bitpos); |
9193 | TYPE_SIZE (new_union_type) | |
9194 | = size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit); | |
9195 | TYPE_SIZE_UNIT (new_union_type) | |
9196 | = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type), | |
9197 | byte_from_pos (offset, bitpos)); | |
9198 | SET_TYPE_ADA_SIZE (new_union_type, | |
9199 | size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type), | |
9200 | first_bit)); | |
fe37c7af | 9201 | SET_TYPE_ALIGN (new_union_type, TYPE_ALIGN (old_union_type)); |
95c1c4bb EB |
9202 | relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY); |
9203 | } | |
9204 | else | |
9205 | copy_and_substitute_in_size (new_union_type, old_union_type, subst_list); | |
9206 | ||
9207 | /* Now finish up the new variants and populate the union type. */ | |
9771b263 | 9208 | FOR_EACH_VEC_ELT_REVERSE (variant_list, i, v) |
95c1c4bb | 9209 | { |
fb7fb701 | 9210 | tree old_field = v->field, new_field; |
95c1c4bb EB |
9211 | tree old_variant, old_variant_subpart, new_variant, field_list; |
9212 | ||
9213 | /* Skip variants that don't belong to this nesting level. */ | |
9214 | if (DECL_CONTEXT (old_field) != old_union_type) | |
9215 | continue; | |
9216 | ||
9217 | /* Retrieve the list of fields already added to the new variant. */ | |
82ea8185 | 9218 | new_variant = v->new_type; |
95c1c4bb EB |
9219 | field_list = TYPE_FIELDS (new_variant); |
9220 | ||
9221 | /* If the old variant had a variant subpart, we need to create a new | |
9222 | variant subpart and add it to the field list. */ | |
fb7fb701 | 9223 | old_variant = v->type; |
95c1c4bb EB |
9224 | old_variant_subpart = get_variant_part (old_variant); |
9225 | if (old_variant_subpart) | |
9226 | { | |
9227 | tree new_variant_subpart | |
9228 | = create_variant_part_from (old_variant_subpart, variant_list, | |
05dbb83f AC |
9229 | new_variant, pos_list, subst_list, |
9230 | debug_info_p); | |
910ad8de | 9231 | DECL_CHAIN (new_variant_subpart) = field_list; |
95c1c4bb EB |
9232 | field_list = new_variant_subpart; |
9233 | } | |
9234 | ||
05dbb83f AC |
9235 | /* Finish up the new variant and create the field. */ |
9236 | finish_record_type (new_variant, nreverse (field_list), 2, debug_info_p); | |
95c1c4bb | 9237 | compute_record_mode (new_variant); |
05dbb83f AC |
9238 | create_type_decl (TYPE_NAME (new_variant), new_variant, true, |
9239 | debug_info_p, Empty); | |
95c1c4bb EB |
9240 | |
9241 | new_field | |
9242 | = create_field_decl_from (old_field, new_variant, new_union_type, | |
9243 | TYPE_SIZE (new_variant), | |
9244 | pos_list, subst_list); | |
fb7fb701 | 9245 | DECL_QUALIFIER (new_field) = v->qual; |
95c1c4bb | 9246 | DECL_INTERNAL_P (new_field) = 1; |
910ad8de | 9247 | DECL_CHAIN (new_field) = union_field_list; |
95c1c4bb EB |
9248 | union_field_list = new_field; |
9249 | } | |
9250 | ||
05dbb83f AC |
9251 | /* Finish up the union type and create the variant part. Note that we don't |
9252 | reverse the field list because VARIANT_LIST has been traversed in reverse | |
9253 | order. */ | |
9254 | finish_record_type (new_union_type, union_field_list, 2, debug_info_p); | |
95c1c4bb | 9255 | compute_record_mode (new_union_type); |
05dbb83f AC |
9256 | create_type_decl (TYPE_NAME (new_union_type), new_union_type, true, |
9257 | debug_info_p, Empty); | |
95c1c4bb EB |
9258 | |
9259 | new_variant_part | |
9260 | = create_field_decl_from (old_variant_part, new_union_type, record_type, | |
9261 | TYPE_SIZE (new_union_type), | |
9262 | pos_list, subst_list); | |
9263 | DECL_INTERNAL_P (new_variant_part) = 1; | |
9264 | ||
9265 | /* With multiple discriminants it is possible for an inner variant to be | |
9266 | statically selected while outer ones are not; in this case, the list | |
9267 | of fields of the inner variant is not flattened and we end up with a | |
9268 | qualified union with a single member. Drop the useless container. */ | |
910ad8de | 9269 | if (!DECL_CHAIN (union_field_list)) |
95c1c4bb EB |
9270 | { |
9271 | DECL_CONTEXT (union_field_list) = record_type; | |
9272 | DECL_FIELD_OFFSET (union_field_list) | |
9273 | = DECL_FIELD_OFFSET (new_variant_part); | |
9274 | DECL_FIELD_BIT_OFFSET (union_field_list) | |
9275 | = DECL_FIELD_BIT_OFFSET (new_variant_part); | |
9276 | SET_DECL_OFFSET_ALIGN (union_field_list, | |
9277 | DECL_OFFSET_ALIGN (new_variant_part)); | |
9278 | new_variant_part = union_field_list; | |
9279 | } | |
9280 | ||
9281 | return new_variant_part; | |
9282 | } | |
9283 | ||
9284 | /* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE, | |
9285 | which are both RECORD_TYPE, after applying the substitutions described | |
9286 | in SUBST_LIST. */ | |
9287 | ||
9288 | static void | |
e3554601 | 9289 | copy_and_substitute_in_size (tree new_type, tree old_type, |
9771b263 | 9290 | vec<subst_pair> subst_list) |
95c1c4bb | 9291 | { |
f54ee980 | 9292 | unsigned int i; |
e3554601 | 9293 | subst_pair *s; |
95c1c4bb EB |
9294 | |
9295 | TYPE_SIZE (new_type) = TYPE_SIZE (old_type); | |
9296 | TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type); | |
9297 | SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type)); | |
fe37c7af | 9298 | SET_TYPE_ALIGN (new_type, TYPE_ALIGN (old_type)); |
95c1c4bb EB |
9299 | relate_alias_sets (new_type, old_type, ALIAS_SET_COPY); |
9300 | ||
9301 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type))) | |
9771b263 | 9302 | FOR_EACH_VEC_ELT (subst_list, i, s) |
95c1c4bb EB |
9303 | TYPE_SIZE (new_type) |
9304 | = SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type), | |
e3554601 | 9305 | s->discriminant, s->replacement); |
95c1c4bb EB |
9306 | |
9307 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type))) | |
9771b263 | 9308 | FOR_EACH_VEC_ELT (subst_list, i, s) |
95c1c4bb EB |
9309 | TYPE_SIZE_UNIT (new_type) |
9310 | = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type), | |
e3554601 | 9311 | s->discriminant, s->replacement); |
95c1c4bb EB |
9312 | |
9313 | if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type))) | |
9771b263 | 9314 | FOR_EACH_VEC_ELT (subst_list, i, s) |
95c1c4bb EB |
9315 | SET_TYPE_ADA_SIZE |
9316 | (new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type), | |
e3554601 | 9317 | s->discriminant, s->replacement)); |
95c1c4bb EB |
9318 | |
9319 | /* Finalize the size. */ | |
9320 | TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type)); | |
9321 | TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type)); | |
9322 | } | |
1eb58520 | 9323 | |
05dbb83f AC |
9324 | /* Return true if DISC is a stored discriminant of RECORD_TYPE. */ |
9325 | ||
9326 | static inline bool | |
9327 | is_stored_discriminant (Entity_Id discr, Entity_Id record_type) | |
9328 | { | |
87eddedc EB |
9329 | if (Is_Unchecked_Union (record_type)) |
9330 | return false; | |
9331 | else if (Is_Tagged_Type (record_type)) | |
05dbb83f AC |
9332 | return No (Corresponding_Discriminant (discr)); |
9333 | else if (Ekind (record_type) == E_Record_Type) | |
9334 | return Original_Record_Component (discr) == discr; | |
9335 | else | |
9336 | return true; | |
9337 | } | |
9338 | ||
9339 | /* Copy the layout from {GNAT,GNU}_OLD_TYPE to {GNAT,GNU}_NEW_TYPE, which are | |
9340 | both record types, after applying the substitutions described in SUBST_LIST. | |
9341 | DEBUG_INFO_P is true if we need to write debug information for NEW_TYPE. */ | |
9342 | ||
9343 | static void | |
9344 | copy_and_substitute_in_layout (Entity_Id gnat_new_type, | |
9345 | Entity_Id gnat_old_type, | |
9346 | tree gnu_new_type, | |
9347 | tree gnu_old_type, | |
9348 | vec<subst_pair> gnu_subst_list, | |
9349 | bool debug_info_p) | |
9350 | { | |
9351 | const bool is_subtype = (Ekind (gnat_new_type) == E_Record_Subtype); | |
9352 | tree gnu_field_list = NULL_TREE; | |
9353 | bool selected_variant, all_constant_pos = true; | |
9354 | vec<variant_desc> gnu_variant_list; | |
9355 | ||
9356 | /* Look for REP and variant parts in the old type. */ | |
9357 | tree gnu_rep_part = get_rep_part (gnu_old_type); | |
9358 | tree gnu_variant_part = get_variant_part (gnu_old_type); | |
9359 | ||
9360 | /* If there is a variant part, we must compute whether the constraints | |
9361 | statically select a particular variant. If so, we simply drop the | |
9362 | qualified union and flatten the list of fields. Otherwise we will | |
9363 | build a new qualified union for the variants that are still relevant. */ | |
9364 | if (gnu_variant_part) | |
9365 | { | |
9366 | variant_desc *v; | |
9367 | unsigned int i; | |
9368 | ||
9369 | gnu_variant_list = build_variant_list (TREE_TYPE (gnu_variant_part), | |
9370 | gnu_subst_list, vNULL); | |
9371 | ||
9372 | /* If all the qualifiers are unconditionally true, the innermost variant | |
9373 | is statically selected. */ | |
9374 | selected_variant = true; | |
9375 | FOR_EACH_VEC_ELT (gnu_variant_list, i, v) | |
9376 | if (!integer_onep (v->qual)) | |
9377 | { | |
9378 | selected_variant = false; | |
9379 | break; | |
9380 | } | |
9381 | ||
9382 | /* Otherwise, create the new variants. */ | |
9383 | if (!selected_variant) | |
9384 | FOR_EACH_VEC_ELT (gnu_variant_list, i, v) | |
9385 | { | |
9386 | tree old_variant = v->type; | |
9387 | tree new_variant = make_node (RECORD_TYPE); | |
9388 | tree suffix | |
9389 | = concat_name (DECL_NAME (gnu_variant_part), | |
9390 | IDENTIFIER_POINTER (DECL_NAME (v->field))); | |
9391 | TYPE_NAME (new_variant) | |
9392 | = concat_name (TYPE_NAME (gnu_new_type), | |
9393 | IDENTIFIER_POINTER (suffix)); | |
9394 | TYPE_REVERSE_STORAGE_ORDER (new_variant) | |
9395 | = TYPE_REVERSE_STORAGE_ORDER (gnu_new_type); | |
9396 | copy_and_substitute_in_size (new_variant, old_variant, | |
9397 | gnu_subst_list); | |
9398 | v->new_type = new_variant; | |
9399 | } | |
9400 | } | |
9401 | else | |
9402 | { | |
9403 | gnu_variant_list.create (0); | |
9404 | selected_variant = false; | |
9405 | } | |
9406 | ||
9407 | /* Make a list of fields and their position in the old type. */ | |
9408 | tree gnu_pos_list | |
9409 | = build_position_list (gnu_old_type, | |
9410 | gnu_variant_list.exists () && !selected_variant, | |
9411 | size_zero_node, bitsize_zero_node, | |
9412 | BIGGEST_ALIGNMENT, NULL_TREE); | |
9413 | ||
9414 | /* Now go down every component in the new type and compute its size and | |
9415 | position from those of the component in the old type and the stored | |
9416 | constraints of the new type. */ | |
9417 | Entity_Id gnat_field, gnat_old_field; | |
9418 | for (gnat_field = First_Entity (gnat_new_type); | |
9419 | Present (gnat_field); | |
9420 | gnat_field = Next_Entity (gnat_field)) | |
9421 | if ((Ekind (gnat_field) == E_Component | |
9422 | || (Ekind (gnat_field) == E_Discriminant | |
9423 | && is_stored_discriminant (gnat_field, gnat_new_type))) | |
9424 | && (gnat_old_field = is_subtype | |
9425 | ? Original_Record_Component (gnat_field) | |
9426 | : Corresponding_Record_Component (gnat_field)) | |
9427 | && Underlying_Type (Scope (gnat_old_field)) == gnat_old_type | |
9428 | && present_gnu_tree (gnat_old_field)) | |
9429 | { | |
9430 | Name_Id gnat_name = Chars (gnat_field); | |
9431 | tree gnu_old_field = get_gnu_tree (gnat_old_field); | |
9432 | if (TREE_CODE (gnu_old_field) == COMPONENT_REF) | |
9433 | gnu_old_field = TREE_OPERAND (gnu_old_field, 1); | |
9434 | tree gnu_context = DECL_CONTEXT (gnu_old_field); | |
9435 | tree gnu_field, gnu_field_type, gnu_size, gnu_pos; | |
9436 | tree gnu_cont_type, gnu_last = NULL_TREE; | |
9437 | ||
9438 | /* If the type is the same, retrieve the GCC type from the | |
9439 | old field to take into account possible adjustments. */ | |
9440 | if (Etype (gnat_field) == Etype (gnat_old_field)) | |
9441 | gnu_field_type = TREE_TYPE (gnu_old_field); | |
9442 | else | |
9443 | gnu_field_type = gnat_to_gnu_type (Etype (gnat_field)); | |
9444 | ||
9445 | /* If there was a component clause, the field types must be the same | |
9446 | for the old and new types, so copy the data from the old field to | |
9447 | avoid recomputation here. Also if the field is justified modular | |
9448 | and the optimization in gnat_to_gnu_field was applied. */ | |
9449 | if (Present (Component_Clause (gnat_old_field)) | |
9450 | || (TREE_CODE (gnu_field_type) == RECORD_TYPE | |
9451 | && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) | |
9452 | && TREE_TYPE (TYPE_FIELDS (gnu_field_type)) | |
9453 | == TREE_TYPE (gnu_old_field))) | |
9454 | { | |
9455 | gnu_size = DECL_SIZE (gnu_old_field); | |
9456 | gnu_field_type = TREE_TYPE (gnu_old_field); | |
9457 | } | |
9458 | ||
9459 | /* If the old field was packed and of constant size, we have to get the | |
9460 | old size here as it might differ from what the Etype conveys and the | |
9461 | latter might overlap with the following field. Try to arrange the | |
9462 | type for possible better packing along the way. */ | |
9463 | else if (DECL_PACKED (gnu_old_field) | |
9464 | && TREE_CODE (DECL_SIZE (gnu_old_field)) == INTEGER_CST) | |
9465 | { | |
9466 | gnu_size = DECL_SIZE (gnu_old_field); | |
9467 | if (RECORD_OR_UNION_TYPE_P (gnu_field_type) | |
9468 | && !TYPE_FAT_POINTER_P (gnu_field_type) | |
9469 | && tree_fits_uhwi_p (TYPE_SIZE (gnu_field_type))) | |
9470 | gnu_field_type = make_packable_type (gnu_field_type, true); | |
9471 | } | |
9472 | ||
9473 | else | |
9474 | gnu_size = TYPE_SIZE (gnu_field_type); | |
9475 | ||
9476 | /* If the context of the old field is the old type or its REP part, | |
9477 | put the field directly in the new type; otherwise look up the | |
9478 | context in the variant list and put the field either in the new | |
9479 | type if there is a selected variant or in one new variant. */ | |
9480 | if (gnu_context == gnu_old_type | |
9481 | || (gnu_rep_part && gnu_context == TREE_TYPE (gnu_rep_part))) | |
9482 | gnu_cont_type = gnu_new_type; | |
9483 | else | |
9484 | { | |
9485 | variant_desc *v; | |
9486 | unsigned int i; | |
9487 | tree rep_part; | |
9488 | ||
9489 | FOR_EACH_VEC_ELT (gnu_variant_list, i, v) | |
9490 | if (gnu_context == v->type | |
9491 | || ((rep_part = get_rep_part (v->type)) | |
9492 | && gnu_context == TREE_TYPE (rep_part))) | |
9493 | break; | |
9494 | ||
9495 | if (v) | |
9496 | gnu_cont_type = selected_variant ? gnu_new_type : v->new_type; | |
9497 | else | |
9498 | /* The front-end may pass us "ghost" components if it fails to | |
9499 | recognize that a constrain statically selects a particular | |
9500 | variant. Discard them. */ | |
9501 | continue; | |
9502 | } | |
9503 | ||
9504 | /* Now create the new field modeled on the old one. */ | |
9505 | gnu_field | |
9506 | = create_field_decl_from (gnu_old_field, gnu_field_type, | |
9507 | gnu_cont_type, gnu_size, | |
9508 | gnu_pos_list, gnu_subst_list); | |
9509 | gnu_pos = DECL_FIELD_OFFSET (gnu_field); | |
9510 | ||
9511 | /* If the context is a variant, put it in the new variant directly. */ | |
9512 | if (gnu_cont_type != gnu_new_type) | |
9513 | { | |
9514 | DECL_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type); | |
9515 | TYPE_FIELDS (gnu_cont_type) = gnu_field; | |
9516 | } | |
9517 | ||
9518 | /* To match the layout crafted in components_to_record, if this is | |
9519 | the _Tag or _Parent field, put it before any other fields. */ | |
9520 | else if (gnat_name == Name_uTag || gnat_name == Name_uParent) | |
9521 | gnu_field_list = chainon (gnu_field_list, gnu_field); | |
9522 | ||
9523 | /* Similarly, if this is the _Controller field, put it before the | |
9524 | other fields except for the _Tag or _Parent field. */ | |
9525 | else if (gnat_name == Name_uController && gnu_last) | |
9526 | { | |
9527 | DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); | |
9528 | DECL_CHAIN (gnu_last) = gnu_field; | |
9529 | } | |
9530 | ||
9531 | /* Otherwise, put it after the other fields. */ | |
9532 | else | |
9533 | { | |
9534 | DECL_CHAIN (gnu_field) = gnu_field_list; | |
9535 | gnu_field_list = gnu_field; | |
9536 | if (!gnu_last) | |
9537 | gnu_last = gnu_field; | |
9538 | if (TREE_CODE (gnu_pos) != INTEGER_CST) | |
9539 | all_constant_pos = false; | |
9540 | } | |
9541 | ||
9542 | /* For a stored discriminant in a derived type, replace the field. */ | |
9543 | if (!is_subtype && Ekind (gnat_field) == E_Discriminant) | |
9544 | { | |
9545 | tree gnu_ref = get_gnu_tree (gnat_field); | |
9546 | TREE_OPERAND (gnu_ref, 1) = gnu_field; | |
9547 | } | |
9548 | else | |
9549 | save_gnu_tree (gnat_field, gnu_field, false); | |
9550 | } | |
9551 | ||
fac51974 | 9552 | /* If there is no variant list or a selected variant and the fields all have |
05dbb83f | 9553 | constant position, put them in order of increasing position to match that |
fac51974 EB |
9554 | of constant CONSTRUCTORs. */ |
9555 | if ((!gnu_variant_list.exists () || selected_variant) && all_constant_pos) | |
05dbb83f AC |
9556 | { |
9557 | const int len = list_length (gnu_field_list); | |
9558 | tree *field_arr = XALLOCAVEC (tree, len), t = gnu_field_list; | |
9559 | ||
9560 | for (int i = 0; t; t = DECL_CHAIN (t), i++) | |
9561 | field_arr[i] = t; | |
9562 | ||
9563 | qsort (field_arr, len, sizeof (tree), compare_field_bitpos); | |
9564 | ||
9565 | gnu_field_list = NULL_TREE; | |
9566 | for (int i = 0; i < len; i++) | |
9567 | { | |
9568 | DECL_CHAIN (field_arr[i]) = gnu_field_list; | |
9569 | gnu_field_list = field_arr[i]; | |
9570 | } | |
9571 | } | |
9572 | ||
9573 | /* If there is a variant list and no selected variant, we need to create the | |
9574 | nest of variant parts from the old nest. */ | |
9575 | else if (gnu_variant_list.exists () && !selected_variant) | |
9576 | { | |
9577 | tree new_variant_part | |
9578 | = create_variant_part_from (gnu_variant_part, gnu_variant_list, | |
9579 | gnu_new_type, gnu_pos_list, | |
9580 | gnu_subst_list, debug_info_p); | |
9581 | DECL_CHAIN (new_variant_part) = gnu_field_list; | |
9582 | gnu_field_list = new_variant_part; | |
9583 | } | |
9584 | ||
9585 | gnu_variant_list.release (); | |
9586 | gnu_subst_list.release (); | |
9587 | ||
9588 | gnu_field_list = nreverse (gnu_field_list); | |
9589 | ||
9590 | /* If NEW_TYPE is a subtype, it inherits all the attributes from OLD_TYPE. | |
9591 | Otherwise sizes and alignment must be computed independently. */ | |
9592 | if (is_subtype) | |
9593 | { | |
9594 | finish_record_type (gnu_new_type, gnu_field_list, 2, debug_info_p); | |
9595 | compute_record_mode (gnu_new_type); | |
9596 | } | |
9597 | else | |
9598 | finish_record_type (gnu_new_type, gnu_field_list, 1, debug_info_p); | |
9599 | ||
9600 | /* Now go through the entities again looking for Itypes that we have not yet | |
9601 | elaborated (e.g. Etypes of fields that have Original_Components). */ | |
9602 | for (Entity_Id gnat_field = First_Entity (gnat_new_type); | |
9603 | Present (gnat_field); | |
9604 | gnat_field = Next_Entity (gnat_field)) | |
9605 | if ((Ekind (gnat_field) == E_Component | |
9606 | || Ekind (gnat_field) == E_Discriminant) | |
9607 | && Is_Itype (Etype (gnat_field)) | |
9608 | && !present_gnu_tree (Etype (gnat_field))) | |
9609 | gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, false); | |
9610 | } | |
9611 | ||
2d595887 PMR |
9612 | /* Associate to GNU_TYPE, the translation of GNAT_ENTITY, which is |
9613 | the implementation type of a packed array type (Is_Packed_Array_Impl_Type), | |
9614 | the original array type if it has been translated. This association is a | |
9615 | parallel type for GNAT encodings or a debug type for standard DWARF. Note | |
9616 | that for standard DWARF, we also want to get the original type name. */ | |
1eb58520 AC |
9617 | |
9618 | static void | |
2d595887 | 9619 | associate_original_type_to_packed_array (tree gnu_type, Entity_Id gnat_entity) |
1eb58520 AC |
9620 | { |
9621 | Entity_Id gnat_original_array_type | |
9622 | = Underlying_Type (Original_Array_Type (gnat_entity)); | |
9623 | tree gnu_original_array_type; | |
9624 | ||
9625 | if (!present_gnu_tree (gnat_original_array_type)) | |
9626 | return; | |
9627 | ||
9628 | gnu_original_array_type = gnat_to_gnu_type (gnat_original_array_type); | |
9629 | ||
9630 | if (TYPE_IS_DUMMY_P (gnu_original_array_type)) | |
9631 | return; | |
9632 | ||
2d595887 PMR |
9633 | if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
9634 | { | |
9635 | tree original_name = TYPE_NAME (gnu_original_array_type); | |
9636 | ||
9637 | if (TREE_CODE (original_name) == TYPE_DECL) | |
9638 | original_name = DECL_NAME (original_name); | |
9639 | ||
9640 | SET_TYPE_ORIGINAL_PACKED_ARRAY (gnu_type, gnu_original_array_type); | |
9641 | TYPE_NAME (gnu_type) = original_name; | |
9642 | } | |
9643 | else | |
9644 | add_parallel_type (gnu_type, gnu_original_array_type); | |
1eb58520 | 9645 | } |
95c1c4bb | 9646 | \f |
05dbb83f AC |
9647 | /* Given a type T, a FIELD_DECL F, and a replacement value R, return an |
9648 | equivalent type with adjusted size expressions where all occurrences | |
9649 | of references to F in a PLACEHOLDER_EXPR have been replaced by R. | |
77022fa8 EB |
9650 | |
9651 | The function doesn't update the layout of the type, i.e. it assumes | |
9652 | that the substitution is purely formal. That's why the replacement | |
9653 | value R must itself contain a PLACEHOLDER_EXPR. */ | |
a1ab4c31 AC |
9654 | |
9655 | tree | |
9656 | substitute_in_type (tree t, tree f, tree r) | |
9657 | { | |
c6bd4220 | 9658 | tree nt; |
77022fa8 EB |
9659 | |
9660 | gcc_assert (CONTAINS_PLACEHOLDER_P (r)); | |
a1ab4c31 AC |
9661 | |
9662 | switch (TREE_CODE (t)) | |
9663 | { | |
9664 | case INTEGER_TYPE: | |
9665 | case ENUMERAL_TYPE: | |
9666 | case BOOLEAN_TYPE: | |
a531043b | 9667 | case REAL_TYPE: |
84fb43a1 EB |
9668 | |
9669 | /* First the domain types of arrays. */ | |
9670 | if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t)) | |
9671 | || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t))) | |
a1ab4c31 | 9672 | { |
84fb43a1 EB |
9673 | tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r); |
9674 | tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r); | |
a1ab4c31 | 9675 | |
84fb43a1 | 9676 | if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t)) |
a1ab4c31 AC |
9677 | return t; |
9678 | ||
c6bd4220 EB |
9679 | nt = copy_type (t); |
9680 | TYPE_GCC_MIN_VALUE (nt) = low; | |
9681 | TYPE_GCC_MAX_VALUE (nt) = high; | |
a531043b EB |
9682 | |
9683 | if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t)) | |
a1ab4c31 | 9684 | SET_TYPE_INDEX_TYPE |
c6bd4220 | 9685 | (nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r)); |
a1ab4c31 | 9686 | |
c6bd4220 | 9687 | return nt; |
a1ab4c31 | 9688 | } |
77022fa8 | 9689 | |
84fb43a1 EB |
9690 | /* Then the subtypes. */ |
9691 | if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t)) | |
9692 | || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t))) | |
9693 | { | |
9694 | tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r); | |
9695 | tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r); | |
9696 | ||
9697 | if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t)) | |
9698 | return t; | |
9699 | ||
c6bd4220 EB |
9700 | nt = copy_type (t); |
9701 | SET_TYPE_RM_MIN_VALUE (nt, low); | |
9702 | SET_TYPE_RM_MAX_VALUE (nt, high); | |
84fb43a1 | 9703 | |
c6bd4220 | 9704 | return nt; |
84fb43a1 EB |
9705 | } |
9706 | ||
a1ab4c31 AC |
9707 | return t; |
9708 | ||
9709 | case COMPLEX_TYPE: | |
c6bd4220 EB |
9710 | nt = substitute_in_type (TREE_TYPE (t), f, r); |
9711 | if (nt == TREE_TYPE (t)) | |
a1ab4c31 AC |
9712 | return t; |
9713 | ||
c6bd4220 | 9714 | return build_complex_type (nt); |
a1ab4c31 | 9715 | |
a1ab4c31 | 9716 | case FUNCTION_TYPE: |
77022fa8 | 9717 | /* These should never show up here. */ |
a1ab4c31 AC |
9718 | gcc_unreachable (); |
9719 | ||
9720 | case ARRAY_TYPE: | |
9721 | { | |
9722 | tree component = substitute_in_type (TREE_TYPE (t), f, r); | |
9723 | tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r); | |
9724 | ||
9725 | if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) | |
9726 | return t; | |
9727 | ||
523e82a7 | 9728 | nt = build_nonshared_array_type (component, domain); |
fe37c7af | 9729 | SET_TYPE_ALIGN (nt, TYPE_ALIGN (t)); |
c6bd4220 EB |
9730 | TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t); |
9731 | SET_TYPE_MODE (nt, TYPE_MODE (t)); | |
9732 | TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); | |
9733 | TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); | |
c6bd4220 EB |
9734 | TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t); |
9735 | TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t); | |
d42b7559 EB |
9736 | if (TYPE_REVERSE_STORAGE_ORDER (t)) |
9737 | set_reverse_storage_order_on_array_type (nt); | |
9738 | if (TYPE_NONALIASED_COMPONENT (t)) | |
9739 | set_nonaliased_component_on_array_type (nt); | |
c6bd4220 | 9740 | return nt; |
a1ab4c31 AC |
9741 | } |
9742 | ||
9743 | case RECORD_TYPE: | |
9744 | case UNION_TYPE: | |
9745 | case QUAL_UNION_TYPE: | |
9746 | { | |
77022fa8 | 9747 | bool changed_field = false; |
a1ab4c31 | 9748 | tree field; |
a1ab4c31 AC |
9749 | |
9750 | /* Start out with no fields, make new fields, and chain them | |
9751 | in. If we haven't actually changed the type of any field, | |
9752 | discard everything we've done and return the old type. */ | |
c6bd4220 EB |
9753 | nt = copy_type (t); |
9754 | TYPE_FIELDS (nt) = NULL_TREE; | |
a1ab4c31 | 9755 | |
910ad8de | 9756 | for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field)) |
a1ab4c31 | 9757 | { |
77022fa8 EB |
9758 | tree new_field = copy_node (field), new_n; |
9759 | ||
9760 | new_n = substitute_in_type (TREE_TYPE (field), f, r); | |
9761 | if (new_n != TREE_TYPE (field)) | |
a1ab4c31 | 9762 | { |
77022fa8 EB |
9763 | TREE_TYPE (new_field) = new_n; |
9764 | changed_field = true; | |
9765 | } | |
a1ab4c31 | 9766 | |
77022fa8 EB |
9767 | new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r); |
9768 | if (new_n != DECL_FIELD_OFFSET (field)) | |
9769 | { | |
9770 | DECL_FIELD_OFFSET (new_field) = new_n; | |
9771 | changed_field = true; | |
9772 | } | |
a1ab4c31 | 9773 | |
77022fa8 EB |
9774 | /* Do the substitution inside the qualifier, if any. */ |
9775 | if (TREE_CODE (t) == QUAL_UNION_TYPE) | |
9776 | { | |
9777 | new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r); | |
9778 | if (new_n != DECL_QUALIFIER (field)) | |
9779 | { | |
9780 | DECL_QUALIFIER (new_field) = new_n; | |
9781 | changed_field = true; | |
a1ab4c31 AC |
9782 | } |
9783 | } | |
9784 | ||
c6bd4220 | 9785 | DECL_CONTEXT (new_field) = nt; |
cb3d597d | 9786 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field); |
a1ab4c31 | 9787 | |
910ad8de | 9788 | DECL_CHAIN (new_field) = TYPE_FIELDS (nt); |
c6bd4220 | 9789 | TYPE_FIELDS (nt) = new_field; |
a1ab4c31 AC |
9790 | } |
9791 | ||
77022fa8 | 9792 | if (!changed_field) |
a1ab4c31 AC |
9793 | return t; |
9794 | ||
c6bd4220 EB |
9795 | TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt)); |
9796 | TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); | |
9797 | TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); | |
9798 | SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r)); | |
9799 | return nt; | |
a1ab4c31 AC |
9800 | } |
9801 | ||
9802 | default: | |
9803 | return t; | |
9804 | } | |
9805 | } | |
9806 | \f | |
b4680ca1 | 9807 | /* Return the RM size of GNU_TYPE. This is the actual number of bits |
a1ab4c31 AC |
9808 | needed to represent the object. */ |
9809 | ||
9810 | tree | |
9811 | rm_size (tree gnu_type) | |
9812 | { | |
e6e15ec9 | 9813 | /* For integral types, we store the RM size explicitly. */ |
a1ab4c31 AC |
9814 | if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type)) |
9815 | return TYPE_RM_SIZE (gnu_type); | |
b4680ca1 EB |
9816 | |
9817 | /* Return the RM size of the actual data plus the size of the template. */ | |
9818 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
9819 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
a1ab4c31 AC |
9820 | return |
9821 | size_binop (PLUS_EXPR, | |
910ad8de | 9822 | rm_size (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))), |
a1ab4c31 | 9823 | DECL_SIZE (TYPE_FIELDS (gnu_type))); |
b4680ca1 | 9824 | |
e1e5852c EB |
9825 | /* For record or union types, we store the size explicitly. */ |
9826 | if (RECORD_OR_UNION_TYPE_P (gnu_type) | |
315cff15 | 9827 | && !TYPE_FAT_POINTER_P (gnu_type) |
b4680ca1 | 9828 | && TYPE_ADA_SIZE (gnu_type)) |
a1ab4c31 | 9829 | return TYPE_ADA_SIZE (gnu_type); |
b4680ca1 EB |
9830 | |
9831 | /* For other types, this is just the size. */ | |
9832 | return TYPE_SIZE (gnu_type); | |
a1ab4c31 AC |
9833 | } |
9834 | \f | |
0fb2335d EB |
9835 | /* Return the name to be used for GNAT_ENTITY. If a type, create a |
9836 | fully-qualified name, possibly with type information encoding. | |
9837 | Otherwise, return the name. */ | |
9838 | ||
bf44701f EB |
9839 | static const char * |
9840 | get_entity_char (Entity_Id gnat_entity) | |
9841 | { | |
9842 | Get_Encoded_Name (gnat_entity); | |
9843 | return ggc_strdup (Name_Buffer); | |
9844 | } | |
9845 | ||
0fb2335d EB |
9846 | tree |
9847 | get_entity_name (Entity_Id gnat_entity) | |
9848 | { | |
9849 | Get_Encoded_Name (gnat_entity); | |
9850 | return get_identifier_with_length (Name_Buffer, Name_Len); | |
9851 | } | |
9852 | ||
a1ab4c31 AC |
9853 | /* Return an identifier representing the external name to be used for |
9854 | GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___" | |
9855 | and the specified suffix. */ | |
9856 | ||
9857 | tree | |
9858 | create_concat_name (Entity_Id gnat_entity, const char *suffix) | |
9859 | { | |
93582885 EB |
9860 | const Entity_Kind kind = Ekind (gnat_entity); |
9861 | const bool has_suffix = (suffix != NULL); | |
9862 | String_Template temp = {1, has_suffix ? strlen (suffix) : 0}; | |
9863 | String_Pointer sp = {suffix, &temp}; | |
a1ab4c31 | 9864 | |
93582885 | 9865 | Get_External_Name (gnat_entity, has_suffix, sp); |
a1ab4c31 | 9866 | |
0fb2335d EB |
9867 | /* A variable using the Stdcall convention lives in a DLL. We adjust |
9868 | its name to use the jump table, the _imp__NAME contains the address | |
9869 | for the NAME variable. */ | |
a1ab4c31 AC |
9870 | if ((kind == E_Variable || kind == E_Constant) |
9871 | && Has_Stdcall_Convention (gnat_entity)) | |
9872 | { | |
93582885 | 9873 | const int len = strlen (STDCALL_PREFIX) + Name_Len; |
0fb2335d | 9874 | char *new_name = (char *) alloca (len + 1); |
93582885 | 9875 | strcpy (new_name, STDCALL_PREFIX); |
0fb2335d EB |
9876 | strcat (new_name, Name_Buffer); |
9877 | return get_identifier_with_length (new_name, len); | |
a1ab4c31 AC |
9878 | } |
9879 | ||
0fb2335d | 9880 | return get_identifier_with_length (Name_Buffer, Name_Len); |
a1ab4c31 AC |
9881 | } |
9882 | ||
0fb2335d | 9883 | /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a |
a1ab4c31 | 9884 | string, return a new IDENTIFIER_NODE that is the concatenation of |
0fb2335d | 9885 | the name followed by "___" and the specified suffix. */ |
a1ab4c31 AC |
9886 | |
9887 | tree | |
0fb2335d | 9888 | concat_name (tree gnu_name, const char *suffix) |
a1ab4c31 | 9889 | { |
0fb2335d EB |
9890 | const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix); |
9891 | char *new_name = (char *) alloca (len + 1); | |
9892 | strcpy (new_name, IDENTIFIER_POINTER (gnu_name)); | |
9893 | strcat (new_name, "___"); | |
9894 | strcat (new_name, suffix); | |
9895 | return get_identifier_with_length (new_name, len); | |
a1ab4c31 AC |
9896 | } |
9897 | ||
4116e7d0 EB |
9898 | /* Initialize data structures of the decl.c module. */ |
9899 | ||
9900 | void | |
9901 | init_gnat_decl (void) | |
9902 | { | |
9903 | /* Initialize the cache of annotated values. */ | |
d242408f | 9904 | annotate_value_cache = hash_table<value_annotation_hasher>::create_ggc (512); |
1e55d29a EB |
9905 | |
9906 | /* Initialize the association of dummy types with subprograms. */ | |
9907 | dummy_to_subprog_map = hash_table<dummy_type_hasher>::create_ggc (512); | |
4116e7d0 EB |
9908 | } |
9909 | ||
9910 | /* Destroy data structures of the decl.c module. */ | |
9911 | ||
9912 | void | |
9913 | destroy_gnat_decl (void) | |
9914 | { | |
9915 | /* Destroy the cache of annotated values. */ | |
d242408f | 9916 | annotate_value_cache->empty (); |
4116e7d0 | 9917 | annotate_value_cache = NULL; |
1e55d29a EB |
9918 | |
9919 | /* Destroy the association of dummy types with subprograms. */ | |
9920 | dummy_to_subprog_map->empty (); | |
9921 | dummy_to_subprog_map = NULL; | |
4116e7d0 EB |
9922 | } |
9923 | ||
a1ab4c31 | 9924 | #include "gt-ada-decl.h" |