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a1ab4c31 AC |
1 | /**************************************************************************** |
2 | * * | |
3 | * GNAT COMPILER COMPONENTS * | |
4 | * * | |
5 | * D E C L * | |
6 | * * | |
7 | * C Implementation File * | |
8 | * * | |
d47d0a8d | 9 | * Copyright (C) 1992-2010, 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" | |
29 | #include "tm.h" | |
30 | #include "tree.h" | |
31 | #include "flags.h" | |
32 | #include "toplev.h" | |
a1ab4c31 | 33 | #include "ggc.h" |
a1ab4c31 | 34 | #include "target.h" |
f82a627c | 35 | #include "tree-inline.h" |
a1ab4c31 AC |
36 | |
37 | #include "ada.h" | |
38 | #include "types.h" | |
39 | #include "atree.h" | |
40 | #include "elists.h" | |
41 | #include "namet.h" | |
42 | #include "nlists.h" | |
43 | #include "repinfo.h" | |
44 | #include "snames.h" | |
45 | #include "stringt.h" | |
46 | #include "uintp.h" | |
47 | #include "fe.h" | |
48 | #include "sinfo.h" | |
49 | #include "einfo.h" | |
a1ab4c31 AC |
50 | #include "ada-tree.h" |
51 | #include "gigi.h" | |
52 | ||
a1ab4c31 AC |
53 | /* Convention_Stdcall should be processed in a specific way on Windows targets |
54 | only. The macro below is a helper to avoid having to check for a Windows | |
55 | specific attribute throughout this unit. */ | |
56 | ||
57 | #if TARGET_DLLIMPORT_DECL_ATTRIBUTES | |
58 | #define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall) | |
59 | #else | |
60 | #define Has_Stdcall_Convention(E) (0) | |
61 | #endif | |
62 | ||
63 | /* Stack realignment for functions with foreign conventions is provided on a | |
64 | per back-end basis now, as it is handled by the prologue expanders and not | |
65 | as part of the function's body any more. It might be requested by way of a | |
66 | dedicated function type attribute on the targets that support it. | |
67 | ||
68 | We need a way to avoid setting the attribute on the targets that don't | |
69 | support it and use FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN for this purpose. | |
70 | ||
71 | It is defined on targets where the circuitry is available, and indicates | |
2ddc34ba | 72 | whether the realignment is needed for 'main'. We use this to decide for |
a1ab4c31 AC |
73 | foreign subprograms as well. |
74 | ||
75 | It is not defined on targets where the circuitry is not implemented, and | |
76 | we just never set the attribute in these cases. | |
77 | ||
78 | Whether it is defined on all targets that would need it in theory is | |
79 | not entirely clear. We currently trust the base GCC settings for this | |
80 | purpose. */ | |
81 | ||
82 | #ifndef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN | |
83 | #define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 0 | |
84 | #endif | |
85 | ||
86 | struct incomplete | |
87 | { | |
88 | struct incomplete *next; | |
89 | tree old_type; | |
90 | Entity_Id full_type; | |
91 | }; | |
92 | ||
93 | /* These variables are used to defer recursively expanding incomplete types | |
94 | while we are processing an array, a record or a subprogram type. */ | |
95 | static int defer_incomplete_level = 0; | |
96 | static struct incomplete *defer_incomplete_list; | |
97 | ||
98 | /* This variable is used to delay expanding From_With_Type types until the | |
99 | end of the spec. */ | |
100 | static struct incomplete *defer_limited_with; | |
101 | ||
102 | /* These variables are used to defer finalizing types. The element of the | |
103 | list is the TYPE_DECL associated with the type. */ | |
104 | static int defer_finalize_level = 0; | |
105 | static VEC (tree,heap) *defer_finalize_list; | |
106 | ||
107 | /* A hash table used to cache the result of annotate_value. */ | |
108 | static GTY ((if_marked ("tree_int_map_marked_p"), | |
109 | param_is (struct tree_int_map))) htab_t annotate_value_cache; | |
110 | ||
794511d2 EB |
111 | enum alias_set_op |
112 | { | |
113 | ALIAS_SET_COPY, | |
114 | ALIAS_SET_SUBSET, | |
115 | ALIAS_SET_SUPERSET | |
116 | }; | |
117 | ||
118 | static void relate_alias_sets (tree, tree, enum alias_set_op); | |
119 | ||
a1ab4c31 AC |
120 | static bool allocatable_size_p (tree, bool); |
121 | static void prepend_one_attribute_to (struct attrib **, | |
122 | enum attr_type, tree, tree, Node_Id); | |
123 | static void prepend_attributes (Entity_Id, struct attrib **); | |
124 | static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool); | |
125 | static bool is_variable_size (tree); | |
a531043b | 126 | static tree elaborate_expression_1 (tree, Entity_Id, tree, bool, bool); |
da01bfee EB |
127 | static tree elaborate_expression_2 (tree, Entity_Id, tree, bool, bool, |
128 | unsigned int); | |
a1ab4c31 | 129 | static tree make_packable_type (tree, bool); |
2cac6017 | 130 | static tree gnat_to_gnu_component_type (Entity_Id, bool, bool); |
a1ab4c31 AC |
131 | static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool, |
132 | bool *); | |
2cac6017 | 133 | static tree gnat_to_gnu_field (Entity_Id, tree, int, bool, bool); |
a1ab4c31 | 134 | static bool same_discriminant_p (Entity_Id, Entity_Id); |
d8e94f79 | 135 | static bool array_type_has_nonaliased_component (tree, Entity_Id); |
229077b0 | 136 | static bool compile_time_known_address_p (Node_Id); |
f45f9664 | 137 | static bool cannot_be_superflat_p (Node_Id); |
cb3d597d | 138 | static bool constructor_address_p (tree); |
a1ab4c31 | 139 | static void components_to_record (tree, Node_Id, tree, int, bool, tree *, |
839f2864 | 140 | bool, bool, bool, bool, bool); |
a1ab4c31 AC |
141 | static Uint annotate_value (tree); |
142 | static void annotate_rep (Entity_Id, tree); | |
95c1c4bb EB |
143 | static tree build_position_list (tree, bool, tree, tree, unsigned int, tree); |
144 | static tree build_subst_list (Entity_Id, Entity_Id, bool); | |
145 | static tree build_variant_list (tree, tree, tree); | |
a1ab4c31 AC |
146 | static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool); |
147 | static void set_rm_size (Uint, tree, Entity_Id); | |
148 | static tree make_type_from_size (tree, tree, bool); | |
149 | static unsigned int validate_alignment (Uint, Entity_Id, unsigned int); | |
150 | static unsigned int ceil_alignment (unsigned HOST_WIDE_INT); | |
151 | static void check_ok_for_atomic (tree, Entity_Id, bool); | |
95c1c4bb EB |
152 | static tree create_field_decl_from (tree, tree, tree, tree, tree, tree); |
153 | static tree get_rep_part (tree); | |
154 | static tree get_variant_part (tree); | |
155 | static tree create_variant_part_from (tree, tree, tree, tree, tree); | |
156 | static void copy_and_substitute_in_size (tree, tree, tree); | |
a1ab4c31 | 157 | static void rest_of_type_decl_compilation_no_defer (tree); |
1515785d OH |
158 | |
159 | /* The relevant constituents of a subprogram binding to a GCC builtin. Used | |
160 | to pass around calls performing profile compatibilty checks. */ | |
161 | ||
162 | typedef struct { | |
163 | Entity_Id gnat_entity; /* The Ada subprogram entity. */ | |
164 | tree ada_fntype; /* The corresponding GCC type node. */ | |
165 | tree btin_fntype; /* The GCC builtin function type node. */ | |
166 | } intrin_binding_t; | |
167 | ||
168 | static bool intrin_profiles_compatible_p (intrin_binding_t *); | |
169 | ||
a1ab4c31 AC |
170 | \f |
171 | /* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada | |
1e17ef87 EB |
172 | entity, return the equivalent GCC tree for that entity (a ..._DECL node) |
173 | and associate the ..._DECL node with the input GNAT defining identifier. | |
a1ab4c31 AC |
174 | |
175 | If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its | |
1e17ef87 EB |
176 | initial value (in GCC tree form). This is optional for a variable. For |
177 | a renamed entity, GNU_EXPR gives the object being renamed. | |
a1ab4c31 AC |
178 | |
179 | DEFINITION is nonzero if this call is intended for a definition. This is | |
1e17ef87 EB |
180 | used for separate compilation where it is necessary to know whether an |
181 | external declaration or a definition must be created if the GCC equivalent | |
a1ab4c31 AC |
182 | was not created previously. The value of 1 is normally used for a nonzero |
183 | DEFINITION, but a value of 2 is used in special circumstances, defined in | |
184 | the code. */ | |
185 | ||
186 | tree | |
187 | gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition) | |
188 | { | |
a8e05f92 EB |
189 | /* Contains the kind of the input GNAT node. */ |
190 | const Entity_Kind kind = Ekind (gnat_entity); | |
191 | /* True if this is a type. */ | |
192 | const bool is_type = IN (kind, Type_Kind); | |
86060344 EB |
193 | /* True if debug info is requested for this entity. */ |
194 | const bool debug_info_p = Needs_Debug_Info (gnat_entity); | |
195 | /* True if this entity is to be considered as imported. */ | |
196 | const bool imported_p | |
197 | = (Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity))); | |
a8e05f92 EB |
198 | /* For a type, contains the equivalent GNAT node to be used in gigi. */ |
199 | Entity_Id gnat_equiv_type = Empty; | |
200 | /* Temporary used to walk the GNAT tree. */ | |
1e17ef87 | 201 | Entity_Id gnat_temp; |
1e17ef87 EB |
202 | /* Contains the GCC DECL node which is equivalent to the input GNAT node. |
203 | This node will be associated with the GNAT node by calling at the end | |
204 | of the `switch' statement. */ | |
a1ab4c31 | 205 | tree gnu_decl = NULL_TREE; |
1e17ef87 EB |
206 | /* Contains the GCC type to be used for the GCC node. */ |
207 | tree gnu_type = NULL_TREE; | |
208 | /* Contains the GCC size tree to be used for the GCC node. */ | |
209 | tree gnu_size = NULL_TREE; | |
210 | /* Contains the GCC name to be used for the GCC node. */ | |
0fb2335d | 211 | tree gnu_entity_name; |
1e17ef87 | 212 | /* True if we have already saved gnu_decl as a GNAT association. */ |
a1ab4c31 | 213 | bool saved = false; |
1e17ef87 | 214 | /* True if we incremented defer_incomplete_level. */ |
a1ab4c31 | 215 | bool this_deferred = false; |
1e17ef87 | 216 | /* True if we incremented force_global. */ |
a1ab4c31 | 217 | bool this_global = false; |
1e17ef87 | 218 | /* True if we should check to see if elaborated during processing. */ |
a1ab4c31 | 219 | bool maybe_present = false; |
1e17ef87 | 220 | /* True if we made GNU_DECL and its type here. */ |
a1ab4c31 | 221 | bool this_made_decl = false; |
a8e05f92 EB |
222 | /* Size and alignment of the GCC node, if meaningful. */ |
223 | unsigned int esize = 0, align = 0; | |
224 | /* Contains the list of attributes directly attached to the entity. */ | |
1e17ef87 | 225 | struct attrib *attr_list = NULL; |
a1ab4c31 AC |
226 | |
227 | /* Since a use of an Itype is a definition, process it as such if it | |
2ddc34ba | 228 | is not in a with'ed unit. */ |
1e17ef87 | 229 | if (!definition |
a8e05f92 | 230 | && is_type |
1e17ef87 | 231 | && Is_Itype (gnat_entity) |
a1ab4c31 AC |
232 | && !present_gnu_tree (gnat_entity) |
233 | && In_Extended_Main_Code_Unit (gnat_entity)) | |
234 | { | |
1e17ef87 EB |
235 | /* Ensure that we are in a subprogram mentioned in the Scope chain of |
236 | this entity, our current scope is global, or we encountered a task | |
237 | or entry (where we can't currently accurately check scoping). */ | |
a1ab4c31 AC |
238 | if (!current_function_decl |
239 | || DECL_ELABORATION_PROC_P (current_function_decl)) | |
240 | { | |
241 | process_type (gnat_entity); | |
242 | return get_gnu_tree (gnat_entity); | |
243 | } | |
244 | ||
245 | for (gnat_temp = Scope (gnat_entity); | |
1e17ef87 EB |
246 | Present (gnat_temp); |
247 | gnat_temp = Scope (gnat_temp)) | |
a1ab4c31 AC |
248 | { |
249 | if (Is_Type (gnat_temp)) | |
250 | gnat_temp = Underlying_Type (gnat_temp); | |
251 | ||
252 | if (Ekind (gnat_temp) == E_Subprogram_Body) | |
253 | gnat_temp | |
254 | = Corresponding_Spec (Parent (Declaration_Node (gnat_temp))); | |
255 | ||
256 | if (IN (Ekind (gnat_temp), Subprogram_Kind) | |
257 | && Present (Protected_Body_Subprogram (gnat_temp))) | |
258 | gnat_temp = Protected_Body_Subprogram (gnat_temp); | |
259 | ||
260 | if (Ekind (gnat_temp) == E_Entry | |
261 | || Ekind (gnat_temp) == E_Entry_Family | |
262 | || Ekind (gnat_temp) == E_Task_Type | |
263 | || (IN (Ekind (gnat_temp), Subprogram_Kind) | |
264 | && present_gnu_tree (gnat_temp) | |
265 | && (current_function_decl | |
266 | == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0)))) | |
267 | { | |
268 | process_type (gnat_entity); | |
269 | return get_gnu_tree (gnat_entity); | |
270 | } | |
271 | } | |
272 | ||
a8e05f92 | 273 | /* This abort means the Itype has an incorrect scope, i.e. that its |
1e17ef87 | 274 | scope does not correspond to the subprogram it is declared in. */ |
a1ab4c31 AC |
275 | gcc_unreachable (); |
276 | } | |
277 | ||
a1ab4c31 AC |
278 | /* If we've already processed this entity, return what we got last time. |
279 | If we are defining the node, we should not have already processed it. | |
1e17ef87 EB |
280 | In that case, we will abort below when we try to save a new GCC tree |
281 | for this object. We also need to handle the case of getting a dummy | |
282 | type when a Full_View exists. */ | |
a8e05f92 EB |
283 | if ((!definition || (is_type && imported_p)) |
284 | && present_gnu_tree (gnat_entity)) | |
a1ab4c31 AC |
285 | { |
286 | gnu_decl = get_gnu_tree (gnat_entity); | |
287 | ||
288 | if (TREE_CODE (gnu_decl) == TYPE_DECL | |
289 | && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)) | |
290 | && IN (kind, Incomplete_Or_Private_Kind) | |
291 | && Present (Full_View (gnat_entity))) | |
292 | { | |
1e17ef87 EB |
293 | gnu_decl |
294 | = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0); | |
a1ab4c31 AC |
295 | save_gnu_tree (gnat_entity, NULL_TREE, false); |
296 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
297 | } | |
298 | ||
299 | return gnu_decl; | |
300 | } | |
301 | ||
302 | /* If this is a numeric or enumeral type, or an access type, a nonzero | |
303 | Esize must be specified unless it was specified by the programmer. */ | |
304 | gcc_assert (!Unknown_Esize (gnat_entity) | |
305 | || Has_Size_Clause (gnat_entity) | |
1e17ef87 EB |
306 | || (!IN (kind, Numeric_Kind) |
307 | && !IN (kind, Enumeration_Kind) | |
a1ab4c31 AC |
308 | && (!IN (kind, Access_Kind) |
309 | || kind == E_Access_Protected_Subprogram_Type | |
310 | || kind == E_Anonymous_Access_Protected_Subprogram_Type | |
311 | || kind == E_Access_Subtype))); | |
312 | ||
b4680ca1 | 313 | /* The RM size must be specified for all discrete and fixed-point types. */ |
a8e05f92 EB |
314 | gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind) |
315 | && Unknown_RM_Size (gnat_entity))); | |
316 | ||
317 | /* If we get here, it means we have not yet done anything with this entity. | |
318 | If we are not defining it, it must be a type or an entity that is defined | |
319 | elsewhere or externally, otherwise we should have defined it already. */ | |
320 | gcc_assert (definition | |
321 | || type_annotate_only | |
322 | || is_type | |
323 | || kind == E_Discriminant | |
324 | || kind == E_Component | |
325 | || kind == E_Label | |
326 | || (kind == E_Constant && Present (Full_View (gnat_entity))) | |
327 | || Is_Public (gnat_entity)); | |
a1ab4c31 AC |
328 | |
329 | /* Get the name of the entity and set up the line number and filename of | |
330 | the original definition for use in any decl we make. */ | |
0fb2335d | 331 | gnu_entity_name = get_entity_name (gnat_entity); |
a1ab4c31 AC |
332 | Sloc_to_locus (Sloc (gnat_entity), &input_location); |
333 | ||
a1ab4c31 | 334 | /* For cases when we are not defining (i.e., we are referencing from |
1e17ef87 | 335 | another compilation unit) public entities, show we are at global level |
a1ab4c31 AC |
336 | for the purpose of computing scopes. Don't do this for components or |
337 | discriminants since the relevant test is whether or not the record is | |
a962b0a1 EB |
338 | being defined. */ |
339 | if (!definition | |
a962b0a1 | 340 | && kind != E_Component |
a8e05f92 EB |
341 | && kind != E_Discriminant |
342 | && Is_Public (gnat_entity) | |
343 | && !Is_Statically_Allocated (gnat_entity)) | |
a1ab4c31 AC |
344 | force_global++, this_global = true; |
345 | ||
346 | /* Handle any attributes directly attached to the entity. */ | |
347 | if (Has_Gigi_Rep_Item (gnat_entity)) | |
348 | prepend_attributes (gnat_entity, &attr_list); | |
349 | ||
a8e05f92 EB |
350 | /* Do some common processing for types. */ |
351 | if (is_type) | |
352 | { | |
353 | /* Compute the equivalent type to be used in gigi. */ | |
354 | gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity); | |
355 | ||
356 | /* Machine_Attributes on types are expected to be propagated to | |
357 | subtypes. The corresponding Gigi_Rep_Items are only attached | |
358 | to the first subtype though, so we handle the propagation here. */ | |
359 | if (Base_Type (gnat_entity) != gnat_entity | |
360 | && !Is_First_Subtype (gnat_entity) | |
361 | && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity)))) | |
362 | prepend_attributes (First_Subtype (Base_Type (gnat_entity)), | |
363 | &attr_list); | |
364 | ||
365 | /* Compute a default value for the size of the type. */ | |
366 | if (Known_Esize (gnat_entity) | |
367 | && UI_Is_In_Int_Range (Esize (gnat_entity))) | |
368 | { | |
369 | unsigned int max_esize; | |
370 | esize = UI_To_Int (Esize (gnat_entity)); | |
371 | ||
372 | if (IN (kind, Float_Kind)) | |
373 | max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE); | |
374 | else if (IN (kind, Access_Kind)) | |
375 | max_esize = POINTER_SIZE * 2; | |
376 | else | |
377 | max_esize = LONG_LONG_TYPE_SIZE; | |
378 | ||
feec4372 EB |
379 | if (esize > max_esize) |
380 | esize = max_esize; | |
a8e05f92 EB |
381 | } |
382 | else | |
383 | esize = LONG_LONG_TYPE_SIZE; | |
384 | } | |
a1ab4c31 AC |
385 | |
386 | switch (kind) | |
387 | { | |
388 | case E_Constant: | |
8df2e902 EB |
389 | /* If this is a use of a deferred constant without address clause, |
390 | get its full definition. */ | |
391 | if (!definition | |
392 | && No (Address_Clause (gnat_entity)) | |
393 | && Present (Full_View (gnat_entity))) | |
a1ab4c31 | 394 | { |
8df2e902 EB |
395 | gnu_decl |
396 | = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0); | |
a1ab4c31 AC |
397 | saved = true; |
398 | break; | |
399 | } | |
400 | ||
401 | /* If we have an external constant that we are not defining, get the | |
402 | expression that is was defined to represent. We may throw that | |
403 | expression away later if it is not a constant. Do not retrieve the | |
404 | expression if it is an aggregate or allocator, because in complex | |
405 | instantiation contexts it may not be expanded */ | |
406 | if (!definition | |
407 | && Present (Expression (Declaration_Node (gnat_entity))) | |
408 | && !No_Initialization (Declaration_Node (gnat_entity)) | |
409 | && (Nkind (Expression (Declaration_Node (gnat_entity))) | |
410 | != N_Aggregate) | |
411 | && (Nkind (Expression (Declaration_Node (gnat_entity))) | |
412 | != N_Allocator)) | |
413 | gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity))); | |
414 | ||
8df2e902 EB |
415 | /* Ignore deferred constant definitions without address clause since |
416 | they are processed fully in the front-end. If No_Initialization | |
417 | is set, this is not a deferred constant but a constant whose value | |
418 | is built manually. And constants that are renamings are handled | |
419 | like variables. */ | |
420 | if (definition | |
421 | && !gnu_expr | |
422 | && No (Address_Clause (gnat_entity)) | |
a1ab4c31 AC |
423 | && !No_Initialization (Declaration_Node (gnat_entity)) |
424 | && No (Renamed_Object (gnat_entity))) | |
425 | { | |
426 | gnu_decl = error_mark_node; | |
427 | saved = true; | |
428 | break; | |
429 | } | |
8df2e902 EB |
430 | |
431 | /* Ignore constant definitions already marked with the error node. See | |
432 | the N_Object_Declaration case of gnat_to_gnu for the rationale. */ | |
433 | if (definition | |
434 | && gnu_expr | |
435 | && present_gnu_tree (gnat_entity) | |
436 | && get_gnu_tree (gnat_entity) == error_mark_node) | |
a1ab4c31 | 437 | { |
8df2e902 | 438 | maybe_present = true; |
a1ab4c31 AC |
439 | break; |
440 | } | |
441 | ||
442 | goto object; | |
443 | ||
444 | case E_Exception: | |
445 | /* We used to special case VMS exceptions here to directly map them to | |
446 | their associated condition code. Since this code had to be masked | |
447 | dynamically to strip off the severity bits, this caused trouble in | |
448 | the GCC/ZCX case because the "type" pointers we store in the tables | |
449 | have to be static. We now don't special case here anymore, and let | |
450 | the regular processing take place, which leaves us with a regular | |
451 | exception data object for VMS exceptions too. The condition code | |
452 | mapping is taken care of by the front end and the bitmasking by the | |
c01fe451 | 453 | run-time library. */ |
a1ab4c31 AC |
454 | goto object; |
455 | ||
456 | case E_Discriminant: | |
457 | case E_Component: | |
458 | { | |
2ddc34ba | 459 | /* The GNAT record where the component was defined. */ |
a1ab4c31 AC |
460 | Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity)); |
461 | ||
462 | /* If the variable is an inherited record component (in the case of | |
463 | extended record types), just return the inherited entity, which | |
464 | must be a FIELD_DECL. Likewise for discriminants. | |
465 | For discriminants of untagged records which have explicit | |
466 | stored discriminants, return the entity for the corresponding | |
467 | stored discriminant. Also use Original_Record_Component | |
468 | if the record has a private extension. */ | |
a1ab4c31 AC |
469 | if (Present (Original_Record_Component (gnat_entity)) |
470 | && Original_Record_Component (gnat_entity) != gnat_entity) | |
471 | { | |
472 | gnu_decl | |
473 | = gnat_to_gnu_entity (Original_Record_Component (gnat_entity), | |
474 | gnu_expr, definition); | |
475 | saved = true; | |
476 | break; | |
477 | } | |
478 | ||
479 | /* If the enclosing record has explicit stored discriminants, | |
480 | then it is an untagged record. If the Corresponding_Discriminant | |
481 | is not empty then this must be a renamed discriminant and its | |
482 | Original_Record_Component must point to the corresponding explicit | |
1e17ef87 | 483 | stored discriminant (i.e. we should have taken the previous |
a1ab4c31 | 484 | branch). */ |
a1ab4c31 AC |
485 | else if (Present (Corresponding_Discriminant (gnat_entity)) |
486 | && Is_Tagged_Type (gnat_record)) | |
487 | { | |
2ddc34ba | 488 | /* A tagged record has no explicit stored discriminants. */ |
a1ab4c31 AC |
489 | gcc_assert (First_Discriminant (gnat_record) |
490 | == First_Stored_Discriminant (gnat_record)); | |
491 | gnu_decl | |
492 | = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity), | |
493 | gnu_expr, definition); | |
494 | saved = true; | |
495 | break; | |
496 | } | |
497 | ||
498 | else if (Present (CR_Discriminant (gnat_entity)) | |
499 | && type_annotate_only) | |
500 | { | |
501 | gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity), | |
502 | gnu_expr, definition); | |
503 | saved = true; | |
504 | break; | |
505 | } | |
506 | ||
2ddc34ba EB |
507 | /* If the enclosing record has explicit stored discriminants, then |
508 | it is an untagged record. If the Corresponding_Discriminant | |
a1ab4c31 AC |
509 | is not empty then this must be a renamed discriminant and its |
510 | Original_Record_Component must point to the corresponding explicit | |
1e17ef87 | 511 | stored discriminant (i.e. we should have taken the first |
a1ab4c31 | 512 | branch). */ |
a1ab4c31 AC |
513 | else if (Present (Corresponding_Discriminant (gnat_entity)) |
514 | && (First_Discriminant (gnat_record) | |
515 | != First_Stored_Discriminant (gnat_record))) | |
516 | gcc_unreachable (); | |
517 | ||
518 | /* Otherwise, if we are not defining this and we have no GCC type | |
519 | for the containing record, make one for it. Then we should | |
520 | have made our own equivalent. */ | |
521 | else if (!definition && !present_gnu_tree (gnat_record)) | |
522 | { | |
523 | /* ??? If this is in a record whose scope is a protected | |
524 | type and we have an Original_Record_Component, use it. | |
525 | This is a workaround for major problems in protected type | |
526 | handling. */ | |
527 | Entity_Id Scop = Scope (Scope (gnat_entity)); | |
528 | if ((Is_Protected_Type (Scop) | |
529 | || (Is_Private_Type (Scop) | |
530 | && Present (Full_View (Scop)) | |
531 | && Is_Protected_Type (Full_View (Scop)))) | |
532 | && Present (Original_Record_Component (gnat_entity))) | |
533 | { | |
534 | gnu_decl | |
535 | = gnat_to_gnu_entity (Original_Record_Component | |
536 | (gnat_entity), | |
537 | gnu_expr, 0); | |
538 | saved = true; | |
539 | break; | |
540 | } | |
541 | ||
542 | gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0); | |
543 | gnu_decl = get_gnu_tree (gnat_entity); | |
544 | saved = true; | |
545 | break; | |
546 | } | |
547 | ||
548 | else | |
549 | /* Here we have no GCC type and this is a reference rather than a | |
2ddc34ba | 550 | definition. This should never happen. Most likely the cause is |
a1ab4c31 AC |
551 | reference before declaration in the gnat tree for gnat_entity. */ |
552 | gcc_unreachable (); | |
553 | } | |
554 | ||
555 | case E_Loop_Parameter: | |
556 | case E_Out_Parameter: | |
557 | case E_Variable: | |
558 | ||
86060344 | 559 | /* Simple variables, loop variables, Out parameters and exceptions. */ |
a1ab4c31 AC |
560 | object: |
561 | { | |
a1ab4c31 AC |
562 | bool const_flag |
563 | = ((kind == E_Constant || kind == E_Variable) | |
564 | && Is_True_Constant (gnat_entity) | |
22868cbf | 565 | && !Treat_As_Volatile (gnat_entity) |
a1ab4c31 AC |
566 | && (((Nkind (Declaration_Node (gnat_entity)) |
567 | == N_Object_Declaration) | |
568 | && Present (Expression (Declaration_Node (gnat_entity)))) | |
901ad63f | 569 | || Present (Renamed_Object (gnat_entity)) |
c679a915 | 570 | || imported_p)); |
a1ab4c31 AC |
571 | bool inner_const_flag = const_flag; |
572 | bool static_p = Is_Statically_Allocated (gnat_entity); | |
573 | bool mutable_p = false; | |
86060344 | 574 | bool used_by_ref = false; |
a1ab4c31 AC |
575 | tree gnu_ext_name = NULL_TREE; |
576 | tree renamed_obj = NULL_TREE; | |
577 | tree gnu_object_size; | |
578 | ||
579 | if (Present (Renamed_Object (gnat_entity)) && !definition) | |
580 | { | |
581 | if (kind == E_Exception) | |
582 | gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity), | |
583 | NULL_TREE, 0); | |
584 | else | |
585 | gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity)); | |
586 | } | |
587 | ||
588 | /* Get the type after elaborating the renamed object. */ | |
589 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
590 | ||
871fda0a EB |
591 | /* If this is a standard exception definition, then use the standard |
592 | exception type. This is necessary to make sure that imported and | |
593 | exported views of exceptions are properly merged in LTO mode. */ | |
594 | if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL | |
595 | && DECL_NAME (TYPE_NAME (gnu_type)) == exception_data_name_id) | |
596 | gnu_type = except_type_node; | |
597 | ||
56345d11 | 598 | /* For a debug renaming declaration, build a debug-only entity. */ |
a1ab4c31 AC |
599 | if (Present (Debug_Renaming_Link (gnat_entity))) |
600 | { | |
56345d11 EB |
601 | /* Force a non-null value to make sure the symbol is retained. */ |
602 | tree value = build1 (INDIRECT_REF, gnu_type, | |
603 | build1 (NOP_EXPR, | |
604 | build_pointer_type (gnu_type), | |
605 | integer_minus_one_node)); | |
c172df28 AH |
606 | gnu_decl = build_decl (input_location, |
607 | VAR_DECL, gnu_entity_name, gnu_type); | |
56345d11 EB |
608 | SET_DECL_VALUE_EXPR (gnu_decl, value); |
609 | DECL_HAS_VALUE_EXPR_P (gnu_decl) = 1; | |
a1ab4c31 AC |
610 | gnat_pushdecl (gnu_decl, gnat_entity); |
611 | break; | |
612 | } | |
613 | ||
614 | /* If this is a loop variable, its type should be the base type. | |
615 | This is because the code for processing a loop determines whether | |
616 | a normal loop end test can be done by comparing the bounds of the | |
617 | loop against those of the base type, which is presumed to be the | |
618 | size used for computation. But this is not correct when the size | |
619 | of the subtype is smaller than the type. */ | |
620 | if (kind == E_Loop_Parameter) | |
621 | gnu_type = get_base_type (gnu_type); | |
622 | ||
86060344 EB |
623 | /* Reject non-renamed objects whose type is an unconstrained array or |
624 | any object whose type is a dummy type or void. */ | |
a1ab4c31 AC |
625 | if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE |
626 | && No (Renamed_Object (gnat_entity))) | |
627 | || TYPE_IS_DUMMY_P (gnu_type) | |
628 | || TREE_CODE (gnu_type) == VOID_TYPE) | |
629 | { | |
630 | gcc_assert (type_annotate_only); | |
631 | if (this_global) | |
632 | force_global--; | |
633 | return error_mark_node; | |
634 | } | |
635 | ||
aae8570a EB |
636 | /* If an alignment is specified, use it if valid. Note that exceptions |
637 | are objects but don't have an alignment. We must do this before we | |
638 | validate the size, since the alignment can affect the size. */ | |
a1ab4c31 AC |
639 | if (kind != E_Exception && Known_Alignment (gnat_entity)) |
640 | { | |
641 | gcc_assert (Present (Alignment (gnat_entity))); | |
642 | align = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
643 | TYPE_ALIGN (gnu_type)); | |
86060344 | 644 | |
aae8570a EB |
645 | /* No point in changing the type if there is an address clause |
646 | as the final type of the object will be a reference type. */ | |
647 | if (Present (Address_Clause (gnat_entity))) | |
648 | align = 0; | |
649 | else | |
650 | gnu_type | |
651 | = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity, | |
afb4afcd | 652 | false, false, definition, true); |
a1ab4c31 AC |
653 | } |
654 | ||
86060344 EB |
655 | /* If we are defining the object, see if it has a Size and validate it |
656 | if so. If we are not defining the object and a Size clause applies, | |
657 | simply retrieve the value. We don't want to ignore the clause and | |
658 | it is expected to have been validated already. Then get the new | |
659 | type, if any. */ | |
a1ab4c31 AC |
660 | if (definition) |
661 | gnu_size = validate_size (Esize (gnat_entity), gnu_type, | |
662 | gnat_entity, VAR_DECL, false, | |
663 | Has_Size_Clause (gnat_entity)); | |
664 | else if (Has_Size_Clause (gnat_entity)) | |
665 | gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype); | |
666 | ||
667 | if (gnu_size) | |
668 | { | |
669 | gnu_type | |
670 | = make_type_from_size (gnu_type, gnu_size, | |
671 | Has_Biased_Representation (gnat_entity)); | |
672 | ||
673 | if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)) | |
674 | gnu_size = NULL_TREE; | |
675 | } | |
676 | ||
677 | /* If this object has self-referential size, it must be a record with | |
86060344 EB |
678 | a default discriminant. We are supposed to allocate an object of |
679 | the maximum size in this case, unless it is a constant with an | |
a1ab4c31 AC |
680 | initializing expression, in which case we can get the size from |
681 | that. Note that the resulting size may still be a variable, so | |
682 | this may end up with an indirect allocation. */ | |
683 | if (No (Renamed_Object (gnat_entity)) | |
684 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
685 | { | |
686 | if (gnu_expr && kind == E_Constant) | |
687 | { | |
688 | tree size = TYPE_SIZE (TREE_TYPE (gnu_expr)); | |
689 | if (CONTAINS_PLACEHOLDER_P (size)) | |
690 | { | |
691 | /* If the initializing expression is itself a constant, | |
692 | despite having a nominal type with self-referential | |
693 | size, we can get the size directly from it. */ | |
694 | if (TREE_CODE (gnu_expr) == COMPONENT_REF | |
a1ab4c31 AC |
695 | && TYPE_IS_PADDING_P |
696 | (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) | |
697 | && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL | |
698 | && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0)) | |
699 | || DECL_READONLY_ONCE_ELAB | |
700 | (TREE_OPERAND (gnu_expr, 0)))) | |
701 | gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0)); | |
702 | else | |
703 | gnu_size | |
704 | = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr); | |
705 | } | |
706 | else | |
707 | gnu_size = size; | |
708 | } | |
709 | /* We may have no GNU_EXPR because No_Initialization is | |
710 | set even though there's an Expression. */ | |
711 | else if (kind == E_Constant | |
712 | && (Nkind (Declaration_Node (gnat_entity)) | |
713 | == N_Object_Declaration) | |
714 | && Present (Expression (Declaration_Node (gnat_entity)))) | |
715 | gnu_size | |
716 | = TYPE_SIZE (gnat_to_gnu_type | |
717 | (Etype | |
718 | (Expression (Declaration_Node (gnat_entity))))); | |
719 | else | |
720 | { | |
721 | gnu_size = max_size (TYPE_SIZE (gnu_type), true); | |
722 | mutable_p = true; | |
723 | } | |
724 | } | |
725 | ||
86060344 EB |
726 | /* If the size is zero byte, make it one byte since some linkers have |
727 | troubles with zero-sized objects. If the object will have a | |
a1ab4c31 AC |
728 | template, that will make it nonzero so don't bother. Also avoid |
729 | doing that for an object renaming or an object with an address | |
730 | clause, as we would lose useful information on the view size | |
731 | (e.g. for null array slices) and we are not allocating the object | |
732 | here anyway. */ | |
733 | if (((gnu_size | |
734 | && integer_zerop (gnu_size) | |
735 | && !TREE_OVERFLOW (gnu_size)) | |
736 | || (TYPE_SIZE (gnu_type) | |
737 | && integer_zerop (TYPE_SIZE (gnu_type)) | |
738 | && !TREE_OVERFLOW (TYPE_SIZE (gnu_type)))) | |
739 | && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
740 | || !Is_Array_Type (Etype (gnat_entity))) | |
a8e05f92 EB |
741 | && No (Renamed_Object (gnat_entity)) |
742 | && No (Address_Clause (gnat_entity))) | |
a1ab4c31 AC |
743 | gnu_size = bitsize_unit_node; |
744 | ||
745 | /* If this is an object with no specified size and alignment, and | |
746 | if either it is atomic or we are not optimizing alignment for | |
747 | space and it is composite and not an exception, an Out parameter | |
748 | or a reference to another object, and the size of its type is a | |
749 | constant, set the alignment to the smallest one which is not | |
750 | smaller than the size, with an appropriate cap. */ | |
751 | if (!gnu_size && align == 0 | |
752 | && (Is_Atomic (gnat_entity) | |
753 | || (!Optimize_Alignment_Space (gnat_entity) | |
754 | && kind != E_Exception | |
755 | && kind != E_Out_Parameter | |
756 | && Is_Composite_Type (Etype (gnat_entity)) | |
757 | && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
c679a915 | 758 | && !Is_Exported (gnat_entity) |
a1ab4c31 AC |
759 | && !imported_p |
760 | && No (Renamed_Object (gnat_entity)) | |
761 | && No (Address_Clause (gnat_entity)))) | |
762 | && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST) | |
763 | { | |
764 | /* No point in jumping through all the hoops needed in order | |
bb3da4f2 EB |
765 | to support BIGGEST_ALIGNMENT if we don't really have to. |
766 | So we cap to the smallest alignment that corresponds to | |
767 | a known efficient memory access pattern of the target. */ | |
a1ab4c31 AC |
768 | unsigned int align_cap = Is_Atomic (gnat_entity) |
769 | ? BIGGEST_ALIGNMENT | |
bb3da4f2 | 770 | : get_mode_alignment (ptr_mode); |
a1ab4c31 AC |
771 | |
772 | if (!host_integerp (TYPE_SIZE (gnu_type), 1) | |
773 | || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0) | |
774 | align = align_cap; | |
775 | else | |
776 | align = ceil_alignment (tree_low_cst (TYPE_SIZE (gnu_type), 1)); | |
777 | ||
778 | /* But make sure not to under-align the object. */ | |
779 | if (align <= TYPE_ALIGN (gnu_type)) | |
780 | align = 0; | |
781 | ||
782 | /* And honor the minimum valid atomic alignment, if any. */ | |
783 | #ifdef MINIMUM_ATOMIC_ALIGNMENT | |
784 | else if (align < MINIMUM_ATOMIC_ALIGNMENT) | |
785 | align = MINIMUM_ATOMIC_ALIGNMENT; | |
786 | #endif | |
787 | } | |
788 | ||
789 | /* If the object is set to have atomic components, find the component | |
790 | type and validate it. | |
791 | ||
792 | ??? Note that we ignore Has_Volatile_Components on objects; it's | |
2ddc34ba | 793 | not at all clear what to do in that case. */ |
a1ab4c31 AC |
794 | if (Has_Atomic_Components (gnat_entity)) |
795 | { | |
796 | tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE | |
797 | ? TREE_TYPE (gnu_type) : gnu_type); | |
798 | ||
799 | while (TREE_CODE (gnu_inner) == ARRAY_TYPE | |
800 | && TYPE_MULTI_ARRAY_P (gnu_inner)) | |
801 | gnu_inner = TREE_TYPE (gnu_inner); | |
802 | ||
803 | check_ok_for_atomic (gnu_inner, gnat_entity, true); | |
804 | } | |
805 | ||
806 | /* Now check if the type of the object allows atomic access. Note | |
807 | that we must test the type, even if this object has size and | |
86060344 EB |
808 | alignment to allow such access, because we will be going inside |
809 | the padded record to assign to the object. We could fix this by | |
810 | always copying via an intermediate value, but it's not clear it's | |
811 | worth the effort. */ | |
a1ab4c31 AC |
812 | if (Is_Atomic (gnat_entity)) |
813 | check_ok_for_atomic (gnu_type, gnat_entity, false); | |
814 | ||
815 | /* If this is an aliased object with an unconstrained nominal subtype, | |
816 | make a type that includes the template. */ | |
817 | if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) | |
818 | && Is_Array_Type (Etype (gnat_entity)) | |
819 | && !type_annotate_only) | |
820 | { | |
821 | tree gnu_fat | |
822 | = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity)))); | |
823 | ||
824 | gnu_type | |
825 | = build_unc_object_type_from_ptr (gnu_fat, gnu_type, | |
0fb2335d | 826 | concat_name (gnu_entity_name, |
928dfa4b EB |
827 | "UNC"), |
828 | debug_info_p); | |
a1ab4c31 AC |
829 | } |
830 | ||
831 | #ifdef MINIMUM_ATOMIC_ALIGNMENT | |
832 | /* If the size is a constant and no alignment is specified, force | |
833 | the alignment to be the minimum valid atomic alignment. The | |
834 | restriction on constant size avoids problems with variable-size | |
835 | temporaries; if the size is variable, there's no issue with | |
836 | atomic access. Also don't do this for a constant, since it isn't | |
837 | necessary and can interfere with constant replacement. Finally, | |
838 | do not do it for Out parameters since that creates an | |
839 | size inconsistency with In parameters. */ | |
840 | if (align == 0 && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type) | |
841 | && !FLOAT_TYPE_P (gnu_type) | |
842 | && !const_flag && No (Renamed_Object (gnat_entity)) | |
843 | && !imported_p && No (Address_Clause (gnat_entity)) | |
844 | && kind != E_Out_Parameter | |
845 | && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST | |
846 | : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)) | |
847 | align = MINIMUM_ATOMIC_ALIGNMENT; | |
848 | #endif | |
849 | ||
850 | /* Make a new type with the desired size and alignment, if needed. | |
851 | But do not take into account alignment promotions to compute the | |
852 | size of the object. */ | |
853 | gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type); | |
854 | if (gnu_size || align > 0) | |
855 | gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, | |
afb4afcd | 856 | false, false, definition, |
a1ab4c31 AC |
857 | gnu_size ? true : false); |
858 | ||
a1ab4c31 AC |
859 | /* If this is a renaming, avoid as much as possible to create a new |
860 | object. However, in several cases, creating it is required. | |
861 | This processing needs to be applied to the raw expression so | |
862 | as to make it more likely to rename the underlying object. */ | |
863 | if (Present (Renamed_Object (gnat_entity))) | |
864 | { | |
865 | bool create_normal_object = false; | |
866 | ||
867 | /* If the renamed object had padding, strip off the reference | |
868 | to the inner object and reset our type. */ | |
869 | if ((TREE_CODE (gnu_expr) == COMPONENT_REF | |
a1ab4c31 AC |
870 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))) |
871 | /* Strip useless conversions around the object. */ | |
3b9c1abd EB |
872 | || (TREE_CODE (gnu_expr) == NOP_EXPR |
873 | && gnat_types_compatible_p | |
874 | (TREE_TYPE (gnu_expr), | |
875 | TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))) | |
a1ab4c31 AC |
876 | { |
877 | gnu_expr = TREE_OPERAND (gnu_expr, 0); | |
878 | gnu_type = TREE_TYPE (gnu_expr); | |
879 | } | |
880 | ||
881 | /* Case 1: If this is a constant renaming stemming from a function | |
882 | call, treat it as a normal object whose initial value is what | |
883 | is being renamed. RM 3.3 says that the result of evaluating a | |
884 | function call is a constant object. As a consequence, it can | |
885 | be the inner object of a constant renaming. In this case, the | |
886 | renaming must be fully instantiated, i.e. it cannot be a mere | |
887 | reference to (part of) an existing object. */ | |
888 | if (const_flag) | |
889 | { | |
890 | tree inner_object = gnu_expr; | |
891 | while (handled_component_p (inner_object)) | |
892 | inner_object = TREE_OPERAND (inner_object, 0); | |
893 | if (TREE_CODE (inner_object) == CALL_EXPR) | |
894 | create_normal_object = true; | |
895 | } | |
896 | ||
897 | /* Otherwise, see if we can proceed with a stabilized version of | |
898 | the renamed entity or if we need to make a new object. */ | |
899 | if (!create_normal_object) | |
900 | { | |
901 | tree maybe_stable_expr = NULL_TREE; | |
902 | bool stable = false; | |
903 | ||
904 | /* Case 2: If the renaming entity need not be materialized and | |
905 | the renamed expression is something we can stabilize, use | |
906 | that for the renaming. At the global level, we can only do | |
907 | this if we know no SAVE_EXPRs need be made, because the | |
908 | expression we return might be used in arbitrary conditional | |
909 | branches so we must force the SAVE_EXPRs evaluation | |
910 | immediately and this requires a function context. */ | |
911 | if (!Materialize_Entity (gnat_entity) | |
912 | && (!global_bindings_p () | |
913 | || (staticp (gnu_expr) | |
914 | && !TREE_SIDE_EFFECTS (gnu_expr)))) | |
915 | { | |
916 | maybe_stable_expr | |
7d7a1fe8 | 917 | = gnat_stabilize_reference (gnu_expr, true, &stable); |
a1ab4c31 AC |
918 | |
919 | if (stable) | |
920 | { | |
a1ab4c31 AC |
921 | /* ??? No DECL_EXPR is created so we need to mark |
922 | the expression manually lest it is shared. */ | |
923 | if (global_bindings_p ()) | |
3f13dd77 EB |
924 | MARK_VISITED (maybe_stable_expr); |
925 | gnu_decl = maybe_stable_expr; | |
a1ab4c31 AC |
926 | save_gnu_tree (gnat_entity, gnu_decl, true); |
927 | saved = true; | |
f4cd2542 EB |
928 | annotate_object (gnat_entity, gnu_type, NULL_TREE, |
929 | false); | |
a1ab4c31 AC |
930 | break; |
931 | } | |
932 | ||
933 | /* The stabilization failed. Keep maybe_stable_expr | |
934 | untouched here to let the pointer case below know | |
935 | about that failure. */ | |
936 | } | |
937 | ||
938 | /* Case 3: If this is a constant renaming and creating a | |
939 | new object is allowed and cheap, treat it as a normal | |
940 | object whose initial value is what is being renamed. */ | |
d5859bf4 EB |
941 | if (const_flag |
942 | && !Is_Composite_Type | |
943 | (Underlying_Type (Etype (gnat_entity)))) | |
a1ab4c31 AC |
944 | ; |
945 | ||
946 | /* Case 4: Make this into a constant pointer to the object we | |
947 | are to rename and attach the object to the pointer if it is | |
948 | something we can stabilize. | |
949 | ||
950 | From the proper scope, attached objects will be referenced | |
951 | directly instead of indirectly via the pointer to avoid | |
952 | subtle aliasing problems with non-addressable entities. | |
953 | They have to be stable because we must not evaluate the | |
954 | variables in the expression every time the renaming is used. | |
955 | The pointer is called a "renaming" pointer in this case. | |
956 | ||
957 | In the rare cases where we cannot stabilize the renamed | |
958 | object, we just make a "bare" pointer, and the renamed | |
959 | entity is always accessed indirectly through it. */ | |
960 | else | |
961 | { | |
962 | gnu_type = build_reference_type (gnu_type); | |
963 | inner_const_flag = TREE_READONLY (gnu_expr); | |
964 | const_flag = true; | |
965 | ||
966 | /* If the previous attempt at stabilizing failed, there | |
967 | is no point in trying again and we reuse the result | |
968 | without attaching it to the pointer. In this case it | |
969 | will only be used as the initializing expression of | |
970 | the pointer and thus needs no special treatment with | |
971 | regard to multiple evaluations. */ | |
972 | if (maybe_stable_expr) | |
973 | ; | |
974 | ||
975 | /* Otherwise, try to stabilize and attach the expression | |
976 | to the pointer if the stabilization succeeds. | |
977 | ||
978 | Note that this might introduce SAVE_EXPRs and we don't | |
979 | check whether we're at the global level or not. This | |
980 | is fine since we are building a pointer initializer and | |
981 | neither the pointer nor the initializing expression can | |
982 | be accessed before the pointer elaboration has taken | |
983 | place in a correct program. | |
984 | ||
985 | These SAVE_EXPRs will be evaluated at the right place | |
986 | by either the evaluation of the initializer for the | |
987 | non-global case or the elaboration code for the global | |
988 | case, and will be attached to the elaboration procedure | |
989 | in the latter case. */ | |
990 | else | |
991 | { | |
992 | maybe_stable_expr | |
7d7a1fe8 | 993 | = gnat_stabilize_reference (gnu_expr, true, &stable); |
a1ab4c31 AC |
994 | |
995 | if (stable) | |
996 | renamed_obj = maybe_stable_expr; | |
997 | ||
998 | /* Attaching is actually performed downstream, as soon | |
999 | as we have a VAR_DECL for the pointer we make. */ | |
1000 | } | |
1001 | ||
58c8f770 EB |
1002 | gnu_expr = build_unary_op (ADDR_EXPR, gnu_type, |
1003 | maybe_stable_expr); | |
a1ab4c31 AC |
1004 | |
1005 | gnu_size = NULL_TREE; | |
1006 | used_by_ref = true; | |
1007 | } | |
1008 | } | |
1009 | } | |
1010 | ||
9cf18af8 EB |
1011 | /* Make a volatile version of this object's type if we are to make |
1012 | the object volatile. We also interpret 13.3(19) conservatively | |
2f283818 | 1013 | and disallow any optimizations for such a non-constant object. */ |
9cf18af8 | 1014 | if ((Treat_As_Volatile (gnat_entity) |
2f283818 | 1015 | || (!const_flag |
871fda0a | 1016 | && gnu_type != except_type_node |
2f283818 | 1017 | && (Is_Exported (gnat_entity) |
c679a915 | 1018 | || imported_p |
2f283818 | 1019 | || Present (Address_Clause (gnat_entity))))) |
9cf18af8 EB |
1020 | && !TYPE_VOLATILE (gnu_type)) |
1021 | gnu_type = build_qualified_type (gnu_type, | |
1022 | (TYPE_QUALS (gnu_type) | |
1023 | | TYPE_QUAL_VOLATILE)); | |
1024 | ||
1025 | /* If we are defining an aliased object whose nominal subtype is | |
1026 | unconstrained, the object is a record that contains both the | |
1027 | template and the object. If there is an initializer, it will | |
1028 | have already been converted to the right type, but we need to | |
1029 | create the template if there is no initializer. */ | |
1030 | if (definition | |
1031 | && !gnu_expr | |
1032 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
1033 | && (TYPE_CONTAINS_TEMPLATE_P (gnu_type) | |
afb4afcd | 1034 | /* Beware that padding might have been introduced above. */ |
315cff15 | 1035 | || (TYPE_PADDING_P (gnu_type) |
9cf18af8 EB |
1036 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) |
1037 | == RECORD_TYPE | |
1038 | && TYPE_CONTAINS_TEMPLATE_P | |
1039 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
a1ab4c31 AC |
1040 | { |
1041 | tree template_field | |
315cff15 | 1042 | = TYPE_PADDING_P (gnu_type) |
a1ab4c31 AC |
1043 | ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type))) |
1044 | : TYPE_FIELDS (gnu_type); | |
0e228dd9 NF |
1045 | VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 1); |
1046 | tree t = build_template (TREE_TYPE (template_field), | |
910ad8de | 1047 | TREE_TYPE (DECL_CHAIN (template_field)), |
0e228dd9 NF |
1048 | NULL_TREE); |
1049 | CONSTRUCTOR_APPEND_ELT (v, template_field, t); | |
1050 | gnu_expr = gnat_build_constructor (gnu_type, v); | |
a1ab4c31 AC |
1051 | } |
1052 | ||
1053 | /* Convert the expression to the type of the object except in the | |
1054 | case where the object's type is unconstrained or the object's type | |
1055 | is a padded record whose field is of self-referential size. In | |
1056 | the former case, converting will generate unnecessary evaluations | |
1057 | of the CONSTRUCTOR to compute the size and in the latter case, we | |
1058 | want to only copy the actual data. */ | |
1059 | if (gnu_expr | |
1060 | && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE | |
1061 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
315cff15 EB |
1062 | && !(TYPE_IS_PADDING_P (gnu_type) |
1063 | && CONTAINS_PLACEHOLDER_P | |
1064 | (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
a1ab4c31 AC |
1065 | gnu_expr = convert (gnu_type, gnu_expr); |
1066 | ||
86060344 EB |
1067 | /* If this is a pointer that doesn't have an initializing expression, |
1068 | initialize it to NULL, unless the object is imported. */ | |
a1ab4c31 | 1069 | if (definition |
315cff15 | 1070 | && (POINTER_TYPE_P (gnu_type) || TYPE_IS_FAT_POINTER_P (gnu_type)) |
86060344 EB |
1071 | && !gnu_expr |
1072 | && !Is_Imported (gnat_entity)) | |
a1ab4c31 AC |
1073 | gnu_expr = integer_zero_node; |
1074 | ||
8df2e902 EB |
1075 | /* If we are defining the object and it has an Address clause, we must |
1076 | either get the address expression from the saved GCC tree for the | |
1077 | object if it has a Freeze node, or elaborate the address expression | |
1078 | here since the front-end has guaranteed that the elaboration has no | |
1079 | effects in this case. */ | |
a1ab4c31 AC |
1080 | if (definition && Present (Address_Clause (gnat_entity))) |
1081 | { | |
86060344 | 1082 | Node_Id gnat_expr = Expression (Address_Clause (gnat_entity)); |
a1ab4c31 | 1083 | tree gnu_address |
8df2e902 | 1084 | = present_gnu_tree (gnat_entity) |
86060344 | 1085 | ? get_gnu_tree (gnat_entity) : gnat_to_gnu (gnat_expr); |
a1ab4c31 AC |
1086 | |
1087 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
1088 | ||
1089 | /* Ignore the size. It's either meaningless or was handled | |
1090 | above. */ | |
1091 | gnu_size = NULL_TREE; | |
1092 | /* Convert the type of the object to a reference type that can | |
1093 | alias everything as per 13.3(19). */ | |
1094 | gnu_type | |
1095 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
1096 | gnu_address = convert (gnu_type, gnu_address); | |
1097 | used_by_ref = true; | |
86060344 EB |
1098 | const_flag |
1099 | = !Is_Public (gnat_entity) | |
1100 | || compile_time_known_address_p (gnat_expr); | |
a1ab4c31 | 1101 | |
8df2e902 EB |
1102 | /* If this is a deferred constant, the initializer is attached to |
1103 | the full view. */ | |
1104 | if (kind == E_Constant && Present (Full_View (gnat_entity))) | |
1105 | gnu_expr | |
1106 | = gnat_to_gnu | |
1107 | (Expression (Declaration_Node (Full_View (gnat_entity)))); | |
1108 | ||
a1ab4c31 AC |
1109 | /* If we don't have an initializing expression for the underlying |
1110 | variable, the initializing expression for the pointer is the | |
1111 | specified address. Otherwise, we have to make a COMPOUND_EXPR | |
1112 | to assign both the address and the initial value. */ | |
1113 | if (!gnu_expr) | |
1114 | gnu_expr = gnu_address; | |
1115 | else | |
1116 | gnu_expr | |
1117 | = build2 (COMPOUND_EXPR, gnu_type, | |
1118 | build_binary_op | |
1119 | (MODIFY_EXPR, NULL_TREE, | |
1120 | build_unary_op (INDIRECT_REF, NULL_TREE, | |
1121 | gnu_address), | |
1122 | gnu_expr), | |
1123 | gnu_address); | |
1124 | } | |
1125 | ||
1126 | /* If it has an address clause and we are not defining it, mark it | |
1127 | as an indirect object. Likewise for Stdcall objects that are | |
1128 | imported. */ | |
1129 | if ((!definition && Present (Address_Clause (gnat_entity))) | |
1130 | || (Is_Imported (gnat_entity) | |
1131 | && Has_Stdcall_Convention (gnat_entity))) | |
1132 | { | |
1133 | /* Convert the type of the object to a reference type that can | |
1134 | alias everything as per 13.3(19). */ | |
1135 | gnu_type | |
1136 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
1137 | gnu_size = NULL_TREE; | |
1138 | ||
1139 | /* No point in taking the address of an initializing expression | |
1140 | that isn't going to be used. */ | |
1141 | gnu_expr = NULL_TREE; | |
1142 | ||
1143 | /* If it has an address clause whose value is known at compile | |
1144 | time, make the object a CONST_DECL. This will avoid a | |
1145 | useless dereference. */ | |
1146 | if (Present (Address_Clause (gnat_entity))) | |
1147 | { | |
1148 | Node_Id gnat_address | |
1149 | = Expression (Address_Clause (gnat_entity)); | |
1150 | ||
1151 | if (compile_time_known_address_p (gnat_address)) | |
1152 | { | |
1153 | gnu_expr = gnat_to_gnu (gnat_address); | |
1154 | const_flag = true; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | used_by_ref = true; | |
1159 | } | |
1160 | ||
1161 | /* If we are at top level and this object is of variable size, | |
1162 | make the actual type a hidden pointer to the real type and | |
1163 | make the initializer be a memory allocation and initialization. | |
1164 | Likewise for objects we aren't defining (presumed to be | |
1165 | external references from other packages), but there we do | |
1166 | not set up an initialization. | |
1167 | ||
1168 | If the object's size overflows, make an allocator too, so that | |
1169 | Storage_Error gets raised. Note that we will never free | |
1170 | such memory, so we presume it never will get allocated. */ | |
a1ab4c31 | 1171 | if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type), |
86060344 EB |
1172 | global_bindings_p () |
1173 | || !definition | |
a1ab4c31 | 1174 | || static_p) |
86060344 EB |
1175 | || (gnu_size && !allocatable_size_p (gnu_size, |
1176 | global_bindings_p () | |
1177 | || !definition | |
1178 | || static_p))) | |
a1ab4c31 AC |
1179 | { |
1180 | gnu_type = build_reference_type (gnu_type); | |
1181 | gnu_size = NULL_TREE; | |
1182 | used_by_ref = true; | |
1183 | const_flag = true; | |
1184 | ||
1185 | /* In case this was a aliased object whose nominal subtype is | |
1186 | unconstrained, the pointer above will be a thin pointer and | |
1187 | build_allocator will automatically make the template. | |
1188 | ||
1189 | If we have a template initializer only (that we made above), | |
1190 | pretend there is none and rely on what build_allocator creates | |
1191 | again anyway. Otherwise (if we have a full initializer), get | |
1192 | the data part and feed that to build_allocator. | |
1193 | ||
1194 | If we are elaborating a mutable object, tell build_allocator to | |
1195 | ignore a possibly simpler size from the initializer, if any, as | |
1196 | we must allocate the maximum possible size in this case. */ | |
a1ab4c31 AC |
1197 | if (definition) |
1198 | { | |
1199 | tree gnu_alloc_type = TREE_TYPE (gnu_type); | |
1200 | ||
1201 | if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE | |
1202 | && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type)) | |
1203 | { | |
1204 | gnu_alloc_type | |
910ad8de | 1205 | = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_alloc_type))); |
a1ab4c31 AC |
1206 | |
1207 | if (TREE_CODE (gnu_expr) == CONSTRUCTOR | |
1208 | && 1 == VEC_length (constructor_elt, | |
1209 | CONSTRUCTOR_ELTS (gnu_expr))) | |
1210 | gnu_expr = 0; | |
1211 | else | |
1212 | gnu_expr | |
1213 | = build_component_ref | |
1214 | (gnu_expr, NULL_TREE, | |
910ad8de | 1215 | DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), |
a1ab4c31 AC |
1216 | false); |
1217 | } | |
1218 | ||
1219 | if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST | |
1220 | && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type)) | |
1221 | && !Is_Imported (gnat_entity)) | |
c01fe451 | 1222 | post_error ("?`Storage_Error` will be raised at run time!", |
a1ab4c31 AC |
1223 | gnat_entity); |
1224 | ||
6f61bd41 EB |
1225 | gnu_expr |
1226 | = build_allocator (gnu_alloc_type, gnu_expr, gnu_type, | |
1227 | Empty, Empty, gnat_entity, mutable_p); | |
a1ab4c31 AC |
1228 | } |
1229 | else | |
1230 | { | |
1231 | gnu_expr = NULL_TREE; | |
1232 | const_flag = false; | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | /* If this object would go into the stack and has an alignment larger | |
1237 | than the largest stack alignment the back-end can honor, resort to | |
1238 | a variable of "aligning type". */ | |
1239 | if (!global_bindings_p () && !static_p && definition | |
1240 | && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT) | |
1241 | { | |
1242 | /* Create the new variable. No need for extra room before the | |
1243 | aligned field as this is in automatic storage. */ | |
1244 | tree gnu_new_type | |
1245 | = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type), | |
1246 | TYPE_SIZE_UNIT (gnu_type), | |
1247 | BIGGEST_ALIGNMENT, 0); | |
1248 | tree gnu_new_var | |
1249 | = create_var_decl (create_concat_name (gnat_entity, "ALIGN"), | |
1250 | NULL_TREE, gnu_new_type, NULL_TREE, false, | |
1251 | false, false, false, NULL, gnat_entity); | |
1252 | ||
1253 | /* Initialize the aligned field if we have an initializer. */ | |
1254 | if (gnu_expr) | |
1255 | add_stmt_with_node | |
1256 | (build_binary_op (MODIFY_EXPR, NULL_TREE, | |
1257 | build_component_ref | |
1258 | (gnu_new_var, NULL_TREE, | |
1259 | TYPE_FIELDS (gnu_new_type), false), | |
1260 | gnu_expr), | |
1261 | gnat_entity); | |
1262 | ||
1263 | /* And setup this entity as a reference to the aligned field. */ | |
1264 | gnu_type = build_reference_type (gnu_type); | |
1265 | gnu_expr | |
1266 | = build_unary_op | |
1267 | (ADDR_EXPR, gnu_type, | |
1268 | build_component_ref (gnu_new_var, NULL_TREE, | |
1269 | TYPE_FIELDS (gnu_new_type), false)); | |
1270 | ||
1271 | gnu_size = NULL_TREE; | |
1272 | used_by_ref = true; | |
1273 | const_flag = true; | |
1274 | } | |
1275 | ||
1276 | if (const_flag) | |
1277 | gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type) | |
1278 | | TYPE_QUAL_CONST)); | |
1279 | ||
1280 | /* Convert the expression to the type of the object except in the | |
1281 | case where the object's type is unconstrained or the object's type | |
1282 | is a padded record whose field is of self-referential size. In | |
1283 | the former case, converting will generate unnecessary evaluations | |
1284 | of the CONSTRUCTOR to compute the size and in the latter case, we | |
1285 | want to only copy the actual data. */ | |
1286 | if (gnu_expr | |
1287 | && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE | |
1288 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
315cff15 EB |
1289 | && !(TYPE_IS_PADDING_P (gnu_type) |
1290 | && CONTAINS_PLACEHOLDER_P | |
1291 | (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) | |
a1ab4c31 AC |
1292 | gnu_expr = convert (gnu_type, gnu_expr); |
1293 | ||
1294 | /* If this name is external or there was a name specified, use it, | |
1295 | unless this is a VMS exception object since this would conflict | |
1296 | with the symbol we need to export in addition. Don't use the | |
1297 | Interface_Name if there is an address clause (see CD30005). */ | |
1298 | if (!Is_VMS_Exception (gnat_entity) | |
1299 | && ((Present (Interface_Name (gnat_entity)) | |
1300 | && No (Address_Clause (gnat_entity))) | |
1301 | || (Is_Public (gnat_entity) | |
1302 | && (!Is_Imported (gnat_entity) | |
1303 | || Is_Exported (gnat_entity))))) | |
0fb2335d | 1304 | gnu_ext_name = create_concat_name (gnat_entity, NULL); |
a1ab4c31 | 1305 | |
58c8f770 EB |
1306 | /* If this is an aggregate constant initialized to a constant, force it |
1307 | to be statically allocated. This saves an initialization copy. */ | |
1308 | if (!static_p | |
1309 | && const_flag | |
a5b8aacd EB |
1310 | && gnu_expr && TREE_CONSTANT (gnu_expr) |
1311 | && AGGREGATE_TYPE_P (gnu_type) | |
a1ab4c31 | 1312 | && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1) |
315cff15 | 1313 | && !(TYPE_IS_PADDING_P (gnu_type) |
a5b8aacd EB |
1314 | && !host_integerp (TYPE_SIZE_UNIT |
1315 | (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1))) | |
a1ab4c31 AC |
1316 | static_p = true; |
1317 | ||
86060344 | 1318 | /* Now create the variable or the constant and set various flags. */ |
58c8f770 EB |
1319 | gnu_decl |
1320 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, | |
1321 | gnu_expr, const_flag, Is_Public (gnat_entity), | |
1322 | imported_p || !definition, static_p, attr_list, | |
1323 | gnat_entity); | |
a1ab4c31 AC |
1324 | DECL_BY_REF_P (gnu_decl) = used_by_ref; |
1325 | DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag; | |
86060344 EB |
1326 | |
1327 | /* If we are defining an Out parameter and optimization isn't enabled, | |
1328 | create a fake PARM_DECL for debugging purposes and make it point to | |
1329 | the VAR_DECL. Suppress debug info for the latter but make sure it | |
1330 | will live on the stack so that it can be accessed from within the | |
1331 | debugger through the PARM_DECL. */ | |
1332 | if (kind == E_Out_Parameter && definition && !optimize && debug_info_p) | |
1333 | { | |
1334 | tree param = create_param_decl (gnu_entity_name, gnu_type, false); | |
1335 | gnat_pushdecl (param, gnat_entity); | |
1336 | SET_DECL_VALUE_EXPR (param, gnu_decl); | |
1337 | DECL_HAS_VALUE_EXPR_P (param) = 1; | |
1338 | DECL_IGNORED_P (gnu_decl) = 1; | |
1339 | TREE_ADDRESSABLE (gnu_decl) = 1; | |
1340 | } | |
1341 | ||
1342 | /* If this is a renaming pointer, attach the renamed object to it and | |
1343 | register it if we are at top level. */ | |
a1ab4c31 AC |
1344 | if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj) |
1345 | { | |
1346 | SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj); | |
1347 | if (global_bindings_p ()) | |
1348 | { | |
1349 | DECL_RENAMING_GLOBAL_P (gnu_decl) = 1; | |
1350 | record_global_renaming_pointer (gnu_decl); | |
1351 | } | |
1352 | } | |
1353 | ||
86060344 EB |
1354 | /* If this is a constant and we are defining it or it generates a real |
1355 | symbol at the object level and we are referencing it, we may want | |
1356 | or need to have a true variable to represent it: | |
1357 | - if optimization isn't enabled, for debugging purposes, | |
1358 | - if the constant is public and not overlaid on something else, | |
1359 | - if its address is taken, | |
1360 | - if either itself or its type is aliased. */ | |
a1ab4c31 AC |
1361 | if (TREE_CODE (gnu_decl) == CONST_DECL |
1362 | && (definition || Sloc (gnat_entity) > Standard_Location) | |
86060344 EB |
1363 | && ((!optimize && debug_info_p) |
1364 | || (Is_Public (gnat_entity) | |
1365 | && No (Address_Clause (gnat_entity))) | |
a1ab4c31 AC |
1366 | || Address_Taken (gnat_entity) |
1367 | || Is_Aliased (gnat_entity) | |
1368 | || Is_Aliased (Etype (gnat_entity)))) | |
1369 | { | |
1370 | tree gnu_corr_var | |
0fb2335d | 1371 | = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
a1ab4c31 | 1372 | gnu_expr, true, Is_Public (gnat_entity), |
44059479 | 1373 | !definition, static_p, attr_list, |
a1ab4c31 AC |
1374 | gnat_entity); |
1375 | ||
1376 | SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var); | |
1377 | ||
1378 | /* As debugging information will be generated for the variable, | |
86060344 EB |
1379 | do not generate debugging information for the constant. */ |
1380 | if (debug_info_p) | |
1381 | DECL_IGNORED_P (gnu_decl) = 1; | |
1382 | else | |
1383 | DECL_IGNORED_P (gnu_corr_var) = 1; | |
a1ab4c31 AC |
1384 | } |
1385 | ||
cb3d597d EB |
1386 | /* If this is a constant, even if we don't need a true variable, we |
1387 | may need to avoid returning the initializer in every case. That | |
1388 | can happen for the address of a (constant) constructor because, | |
1389 | upon dereferencing it, the constructor will be reinjected in the | |
1390 | tree, which may not be valid in every case; see lvalue_required_p | |
1391 | for more details. */ | |
1392 | if (TREE_CODE (gnu_decl) == CONST_DECL) | |
1393 | DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr); | |
1394 | ||
86060344 EB |
1395 | /* If this object is declared in a block that contains a block with an |
1396 | exception handler, and we aren't using the GCC exception mechanism, | |
1397 | we must force this variable in memory in order to avoid an invalid | |
1398 | optimization. */ | |
1399 | if (Exception_Mechanism != Back_End_Exceptions | |
1400 | && Has_Nested_Block_With_Handler (Scope (gnat_entity))) | |
a1ab4c31 AC |
1401 | TREE_ADDRESSABLE (gnu_decl) = 1; |
1402 | ||
86060344 EB |
1403 | /* If we are defining an object with variable size or an object with |
1404 | fixed size that will be dynamically allocated, and we are using the | |
1405 | setjmp/longjmp exception mechanism, update the setjmp buffer. */ | |
1406 | if (definition | |
1407 | && Exception_Mechanism == Setjmp_Longjmp | |
1408 | && get_block_jmpbuf_decl () | |
1409 | && DECL_SIZE_UNIT (gnu_decl) | |
1410 | && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST | |
1411 | || (flag_stack_check == GENERIC_STACK_CHECK | |
1412 | && compare_tree_int (DECL_SIZE_UNIT (gnu_decl), | |
1413 | STACK_CHECK_MAX_VAR_SIZE) > 0))) | |
1414 | add_stmt_with_node (build_call_1_expr | |
1415 | (update_setjmp_buf_decl, | |
1416 | build_unary_op (ADDR_EXPR, NULL_TREE, | |
1417 | get_block_jmpbuf_decl ())), | |
1418 | gnat_entity); | |
1419 | ||
f4cd2542 EB |
1420 | /* Back-annotate Esize and Alignment of the object if not already |
1421 | known. Note that we pick the values of the type, not those of | |
1422 | the object, to shield ourselves from low-level platform-dependent | |
1423 | adjustments like alignment promotion. This is both consistent with | |
1424 | all the treatment above, where alignment and size are set on the | |
1425 | type of the object and not on the object directly, and makes it | |
1426 | possible to support all confirming representation clauses. */ | |
1427 | annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size, | |
1428 | used_by_ref); | |
a1ab4c31 AC |
1429 | } |
1430 | break; | |
1431 | ||
1432 | case E_Void: | |
1433 | /* Return a TYPE_DECL for "void" that we previously made. */ | |
10069d53 | 1434 | gnu_decl = TYPE_NAME (void_type_node); |
a1ab4c31 AC |
1435 | break; |
1436 | ||
1437 | case E_Enumeration_Type: | |
a8e05f92 | 1438 | /* A special case: for the types Character and Wide_Character in |
2ddc34ba | 1439 | Standard, we do not list all the literals. So if the literals |
a1ab4c31 AC |
1440 | are not specified, make this an unsigned type. */ |
1441 | if (No (First_Literal (gnat_entity))) | |
1442 | { | |
1443 | gnu_type = make_unsigned_type (esize); | |
0fb2335d | 1444 | TYPE_NAME (gnu_type) = gnu_entity_name; |
a1ab4c31 | 1445 | |
a8e05f92 | 1446 | /* Set TYPE_STRING_FLAG for Character and Wide_Character types. |
2ddc34ba EB |
1447 | This is needed by the DWARF-2 back-end to distinguish between |
1448 | unsigned integer types and character types. */ | |
a1ab4c31 AC |
1449 | TYPE_STRING_FLAG (gnu_type) = 1; |
1450 | break; | |
1451 | } | |
1452 | ||
a1ab4c31 | 1453 | { |
ca37373a EB |
1454 | /* We have a list of enumeral constants in First_Literal. We make a |
1455 | CONST_DECL for each one and build into GNU_LITERAL_LIST the list to | |
1456 | be placed into TYPE_FIELDS. Each node in the list is a TREE_LIST | |
1457 | whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the | |
1458 | value of the literal. But when we have a regular boolean type, we | |
1459 | simplify this a little by using a BOOLEAN_TYPE. */ | |
1460 | bool is_boolean = Is_Boolean_Type (gnat_entity) | |
1461 | && !Has_Non_Standard_Rep (gnat_entity); | |
a1ab4c31 | 1462 | tree gnu_literal_list = NULL_TREE; |
ca37373a | 1463 | Entity_Id gnat_literal; |
a1ab4c31 AC |
1464 | |
1465 | if (Is_Unsigned_Type (gnat_entity)) | |
1466 | gnu_type = make_unsigned_type (esize); | |
1467 | else | |
1468 | gnu_type = make_signed_type (esize); | |
1469 | ||
ca37373a | 1470 | TREE_SET_CODE (gnu_type, is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE); |
a1ab4c31 AC |
1471 | |
1472 | for (gnat_literal = First_Literal (gnat_entity); | |
1473 | Present (gnat_literal); | |
1474 | gnat_literal = Next_Literal (gnat_literal)) | |
1475 | { | |
ca37373a EB |
1476 | tree gnu_value |
1477 | = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type); | |
a1ab4c31 AC |
1478 | tree gnu_literal |
1479 | = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, | |
1480 | gnu_type, gnu_value, true, false, false, | |
1481 | false, NULL, gnat_literal); | |
1482 | ||
1483 | save_gnu_tree (gnat_literal, gnu_literal, false); | |
1484 | gnu_literal_list = tree_cons (DECL_NAME (gnu_literal), | |
1485 | gnu_value, gnu_literal_list); | |
1486 | } | |
1487 | ||
ca37373a EB |
1488 | if (!is_boolean) |
1489 | TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list); | |
a1ab4c31 AC |
1490 | |
1491 | /* Note that the bounds are updated at the end of this function | |
a8e05f92 | 1492 | to avoid an infinite recursion since they refer to the type. */ |
a1ab4c31 | 1493 | } |
40d1f6af | 1494 | goto discrete_type; |
a1ab4c31 AC |
1495 | |
1496 | case E_Signed_Integer_Type: | |
1497 | case E_Ordinary_Fixed_Point_Type: | |
1498 | case E_Decimal_Fixed_Point_Type: | |
1499 | /* For integer types, just make a signed type the appropriate number | |
1500 | of bits. */ | |
1501 | gnu_type = make_signed_type (esize); | |
40d1f6af | 1502 | goto discrete_type; |
a1ab4c31 AC |
1503 | |
1504 | case E_Modular_Integer_Type: | |
a1ab4c31 | 1505 | { |
b4680ca1 EB |
1506 | /* For modular types, make the unsigned type of the proper number |
1507 | of bits and then set up the modulus, if required. */ | |
1508 | tree gnu_modulus, gnu_high = NULL_TREE; | |
a1ab4c31 | 1509 | |
b4680ca1 EB |
1510 | /* Packed array types are supposed to be subtypes only. */ |
1511 | gcc_assert (!Is_Packed_Array_Type (gnat_entity)); | |
a1ab4c31 | 1512 | |
a8e05f92 | 1513 | gnu_type = make_unsigned_type (esize); |
a1ab4c31 AC |
1514 | |
1515 | /* Get the modulus in this type. If it overflows, assume it is because | |
1516 | it is equal to 2**Esize. Note that there is no overflow checking | |
1517 | done on unsigned type, so we detect the overflow by looking for | |
1518 | a modulus of zero, which is otherwise invalid. */ | |
1519 | gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type); | |
1520 | ||
1521 | if (!integer_zerop (gnu_modulus)) | |
1522 | { | |
1523 | TYPE_MODULAR_P (gnu_type) = 1; | |
1524 | SET_TYPE_MODULUS (gnu_type, gnu_modulus); | |
1525 | gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus, | |
1526 | convert (gnu_type, integer_one_node)); | |
1527 | } | |
1528 | ||
a8e05f92 EB |
1529 | /* If the upper bound is not maximal, make an extra subtype. */ |
1530 | if (gnu_high | |
1531 | && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type))) | |
a1ab4c31 | 1532 | { |
a8e05f92 | 1533 | tree gnu_subtype = make_unsigned_type (esize); |
84fb43a1 | 1534 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high); |
a1ab4c31 | 1535 | TREE_TYPE (gnu_subtype) = gnu_type; |
a1ab4c31 | 1536 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; |
a8e05f92 | 1537 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT"); |
a1ab4c31 AC |
1538 | gnu_type = gnu_subtype; |
1539 | } | |
1540 | } | |
40d1f6af | 1541 | goto discrete_type; |
a1ab4c31 AC |
1542 | |
1543 | case E_Signed_Integer_Subtype: | |
1544 | case E_Enumeration_Subtype: | |
1545 | case E_Modular_Integer_Subtype: | |
1546 | case E_Ordinary_Fixed_Point_Subtype: | |
1547 | case E_Decimal_Fixed_Point_Subtype: | |
1548 | ||
26383c64 | 1549 | /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do |
84fb43a1 | 1550 | not want to call create_range_type since we would like each subtype |
26383c64 | 1551 | node to be distinct. ??? Historically this was in preparation for |
c1abd261 | 1552 | when memory aliasing is implemented, but that's obsolete now given |
26383c64 | 1553 | the call to relate_alias_sets below. |
a1ab4c31 | 1554 | |
a8e05f92 EB |
1555 | The TREE_TYPE field of the INTEGER_TYPE points to the base type; |
1556 | this fact is used by the arithmetic conversion functions. | |
a1ab4c31 | 1557 | |
a8e05f92 EB |
1558 | We elaborate the Ancestor_Subtype if it is not in the current unit |
1559 | and one of our bounds is non-static. We do this to ensure consistent | |
1560 | naming in the case where several subtypes share the same bounds, by | |
1561 | elaborating the first such subtype first, thus using its name. */ | |
a1ab4c31 AC |
1562 | |
1563 | if (!definition | |
1564 | && Present (Ancestor_Subtype (gnat_entity)) | |
1565 | && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) | |
1566 | && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) | |
1567 | || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) | |
b4680ca1 | 1568 | gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0); |
a1ab4c31 | 1569 | |
84fb43a1 | 1570 | /* Set the precision to the Esize except for bit-packed arrays. */ |
a1ab4c31 AC |
1571 | if (Is_Packed_Array_Type (gnat_entity) |
1572 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) | |
6e0f0975 | 1573 | esize = UI_To_Int (RM_Size (gnat_entity)); |
a1ab4c31 | 1574 | |
84fb43a1 EB |
1575 | /* This should be an unsigned type if the base type is unsigned or |
1576 | if the lower bound is constant and non-negative or if the type | |
1577 | is biased. */ | |
1578 | if (Is_Unsigned_Type (Etype (gnat_entity)) | |
1579 | || Is_Unsigned_Type (gnat_entity) | |
1580 | || Has_Biased_Representation (gnat_entity)) | |
1581 | gnu_type = make_unsigned_type (esize); | |
1582 | else | |
1583 | gnu_type = make_signed_type (esize); | |
1584 | TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); | |
a1ab4c31 | 1585 | |
84fb43a1 EB |
1586 | SET_TYPE_RM_MIN_VALUE |
1587 | (gnu_type, | |
1588 | convert (TREE_TYPE (gnu_type), | |
1589 | elaborate_expression (Type_Low_Bound (gnat_entity), | |
1590 | gnat_entity, get_identifier ("L"), | |
1591 | definition, true, | |
1592 | Needs_Debug_Info (gnat_entity)))); | |
1593 | ||
1594 | SET_TYPE_RM_MAX_VALUE | |
1595 | (gnu_type, | |
1596 | convert (TREE_TYPE (gnu_type), | |
1597 | elaborate_expression (Type_High_Bound (gnat_entity), | |
1598 | gnat_entity, get_identifier ("U"), | |
1599 | definition, true, | |
1600 | Needs_Debug_Info (gnat_entity)))); | |
a1ab4c31 AC |
1601 | |
1602 | /* One of the above calls might have caused us to be elaborated, | |
1603 | so don't blow up if so. */ | |
1604 | if (present_gnu_tree (gnat_entity)) | |
1605 | { | |
1606 | maybe_present = true; | |
1607 | break; | |
1608 | } | |
1609 | ||
1610 | TYPE_BIASED_REPRESENTATION_P (gnu_type) | |
1611 | = Has_Biased_Representation (gnat_entity); | |
1612 | ||
4fd78fe6 EB |
1613 | /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
1614 | TYPE_STUB_DECL (gnu_type) | |
1615 | = create_type_stub_decl (gnu_entity_name, gnu_type); | |
1616 | ||
a1ab4c31 AC |
1617 | /* Inherit our alias set from what we're a subtype of. Subtypes |
1618 | are not different types and a pointer can designate any instance | |
1619 | within a subtype hierarchy. */ | |
794511d2 | 1620 | relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); |
a1ab4c31 | 1621 | |
4fd78fe6 EB |
1622 | /* For a packed array, make the original array type a parallel type. */ |
1623 | if (debug_info_p | |
1624 | && Is_Packed_Array_Type (gnat_entity) | |
1625 | && present_gnu_tree (Original_Array_Type (gnat_entity))) | |
1626 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
1627 | gnat_to_gnu_type | |
1628 | (Original_Array_Type (gnat_entity))); | |
1629 | ||
40d1f6af EB |
1630 | discrete_type: |
1631 | ||
b1fa9126 EB |
1632 | /* We have to handle clauses that under-align the type specially. */ |
1633 | if ((Present (Alignment_Clause (gnat_entity)) | |
1634 | || (Is_Packed_Array_Type (gnat_entity) | |
1635 | && Present | |
1636 | (Alignment_Clause (Original_Array_Type (gnat_entity))))) | |
1637 | && UI_Is_In_Int_Range (Alignment (gnat_entity))) | |
1638 | { | |
1639 | align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT; | |
1640 | if (align >= TYPE_ALIGN (gnu_type)) | |
1641 | align = 0; | |
1642 | } | |
1643 | ||
6e0f0975 | 1644 | /* If the type we are dealing with represents a bit-packed array, |
a1ab4c31 AC |
1645 | we need to have the bits left justified on big-endian targets |
1646 | and right justified on little-endian targets. We also need to | |
1647 | ensure that when the value is read (e.g. for comparison of two | |
1648 | such values), we only get the good bits, since the unused bits | |
6e0f0975 EB |
1649 | are uninitialized. Both goals are accomplished by wrapping up |
1650 | the modular type in an enclosing record type. */ | |
a1ab4c31 | 1651 | if (Is_Packed_Array_Type (gnat_entity) |
01ddebf2 | 1652 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) |
a1ab4c31 | 1653 | { |
6e0f0975 | 1654 | tree gnu_field_type, gnu_field; |
a1ab4c31 | 1655 | |
b1fa9126 | 1656 | /* Set the RM size before wrapping up the original type. */ |
84fb43a1 EB |
1657 | SET_TYPE_RM_SIZE (gnu_type, |
1658 | UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); | |
6e0f0975 | 1659 | TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1; |
b1fa9126 EB |
1660 | |
1661 | /* Create a stripped-down declaration, mainly for debugging. */ | |
1662 | create_type_decl (gnu_entity_name, gnu_type, NULL, true, | |
1663 | debug_info_p, gnat_entity); | |
1664 | ||
1665 | /* Now save it and build the enclosing record type. */ | |
6e0f0975 EB |
1666 | gnu_field_type = gnu_type; |
1667 | ||
a1ab4c31 AC |
1668 | gnu_type = make_node (RECORD_TYPE); |
1669 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM"); | |
a1ab4c31 | 1670 | TYPE_PACKED (gnu_type) = 1; |
b1fa9126 EB |
1671 | TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type); |
1672 | TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type); | |
1673 | SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type)); | |
1674 | ||
1675 | /* Propagate the alignment of the modular type to the record type, | |
1676 | unless there is an alignment clause that under-aligns the type. | |
1677 | This means that bit-packed arrays are given "ceil" alignment for | |
1678 | their size by default, which may seem counter-intuitive but makes | |
1679 | it possible to overlay them on modular types easily. */ | |
1680 | TYPE_ALIGN (gnu_type) | |
1681 | = align > 0 ? align : TYPE_ALIGN (gnu_field_type); | |
a1ab4c31 | 1682 | |
b1fa9126 | 1683 | relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); |
a1ab4c31 | 1684 | |
40d1f6af EB |
1685 | /* Don't declare the field as addressable since we won't be taking |
1686 | its address and this would prevent create_field_decl from making | |
1687 | a bitfield. */ | |
da01bfee EB |
1688 | gnu_field |
1689 | = create_field_decl (get_identifier ("OBJECT"), gnu_field_type, | |
1690 | gnu_type, NULL_TREE, bitsize_zero_node, 1, 0); | |
a1ab4c31 | 1691 | |
032d1b71 | 1692 | /* Do not emit debug info until after the parallel type is added. */ |
b1fa9126 EB |
1693 | finish_record_type (gnu_type, gnu_field, 2, false); |
1694 | compute_record_mode (gnu_type); | |
a1ab4c31 | 1695 | TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1; |
a1ab4c31 | 1696 | |
032d1b71 EB |
1697 | if (debug_info_p) |
1698 | { | |
1699 | /* Make the original array type a parallel type. */ | |
1700 | if (present_gnu_tree (Original_Array_Type (gnat_entity))) | |
1701 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
1702 | gnat_to_gnu_type | |
1703 | (Original_Array_Type (gnat_entity))); | |
4fd78fe6 | 1704 | |
032d1b71 EB |
1705 | rest_of_record_type_compilation (gnu_type); |
1706 | } | |
a1ab4c31 AC |
1707 | } |
1708 | ||
1709 | /* If the type we are dealing with has got a smaller alignment than the | |
1710 | natural one, we need to wrap it up in a record type and under-align | |
1711 | the latter. We reuse the padding machinery for this purpose. */ | |
b1fa9126 | 1712 | else if (align > 0) |
a1ab4c31 | 1713 | { |
6e0f0975 EB |
1714 | tree gnu_field_type, gnu_field; |
1715 | ||
1716 | /* Set the RM size before wrapping up the type. */ | |
84fb43a1 EB |
1717 | SET_TYPE_RM_SIZE (gnu_type, |
1718 | UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); | |
b1fa9126 EB |
1719 | |
1720 | /* Create a stripped-down declaration, mainly for debugging. */ | |
1721 | create_type_decl (gnu_entity_name, gnu_type, NULL, true, | |
1722 | debug_info_p, gnat_entity); | |
1723 | ||
1724 | /* Now save it and build the enclosing record type. */ | |
6e0f0975 | 1725 | gnu_field_type = gnu_type; |
a1ab4c31 AC |
1726 | |
1727 | gnu_type = make_node (RECORD_TYPE); | |
1728 | TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD"); | |
a1ab4c31 | 1729 | TYPE_PACKED (gnu_type) = 1; |
b1fa9126 EB |
1730 | TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type); |
1731 | TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type); | |
1732 | SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type)); | |
1733 | TYPE_ALIGN (gnu_type) = align; | |
1734 | relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); | |
a1ab4c31 | 1735 | |
40d1f6af EB |
1736 | /* Don't declare the field as addressable since we won't be taking |
1737 | its address and this would prevent create_field_decl from making | |
1738 | a bitfield. */ | |
da01bfee EB |
1739 | gnu_field |
1740 | = create_field_decl (get_identifier ("F"), gnu_field_type, | |
1741 | gnu_type, NULL_TREE, bitsize_zero_node, 1, 0); | |
a1ab4c31 | 1742 | |
b1fa9126 EB |
1743 | finish_record_type (gnu_type, gnu_field, 2, debug_info_p); |
1744 | compute_record_mode (gnu_type); | |
315cff15 | 1745 | TYPE_PADDING_P (gnu_type) = 1; |
a1ab4c31 AC |
1746 | } |
1747 | ||
a1ab4c31 AC |
1748 | break; |
1749 | ||
1750 | case E_Floating_Point_Type: | |
1751 | /* If this is a VAX floating-point type, use an integer of the proper | |
1752 | size. All the operations will be handled with ASM statements. */ | |
1753 | if (Vax_Float (gnat_entity)) | |
1754 | { | |
1755 | gnu_type = make_signed_type (esize); | |
1756 | TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1; | |
1757 | SET_TYPE_DIGITS_VALUE (gnu_type, | |
1758 | UI_To_gnu (Digits_Value (gnat_entity), | |
1759 | sizetype)); | |
1760 | break; | |
1761 | } | |
1762 | ||
1763 | /* The type of the Low and High bounds can be our type if this is | |
1764 | a type from Standard, so set them at the end of the function. */ | |
1765 | gnu_type = make_node (REAL_TYPE); | |
1766 | TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); | |
1767 | layout_type (gnu_type); | |
1768 | break; | |
1769 | ||
1770 | case E_Floating_Point_Subtype: | |
1771 | if (Vax_Float (gnat_entity)) | |
1772 | { | |
1773 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
1774 | break; | |
1775 | } | |
1776 | ||
1777 | { | |
1778 | if (!definition | |
1779 | && Present (Ancestor_Subtype (gnat_entity)) | |
1780 | && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) | |
1781 | && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) | |
1782 | || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) | |
1783 | gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), | |
1784 | gnu_expr, 0); | |
1785 | ||
1786 | gnu_type = make_node (REAL_TYPE); | |
1787 | TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); | |
1788 | TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); | |
84fb43a1 EB |
1789 | TYPE_GCC_MIN_VALUE (gnu_type) |
1790 | = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type)); | |
1791 | TYPE_GCC_MAX_VALUE (gnu_type) | |
1792 | = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type)); | |
1793 | layout_type (gnu_type); | |
a1ab4c31 | 1794 | |
84fb43a1 EB |
1795 | SET_TYPE_RM_MIN_VALUE |
1796 | (gnu_type, | |
1797 | convert (TREE_TYPE (gnu_type), | |
1798 | elaborate_expression (Type_Low_Bound (gnat_entity), | |
1799 | gnat_entity, get_identifier ("L"), | |
1800 | definition, true, | |
1801 | Needs_Debug_Info (gnat_entity)))); | |
1802 | ||
1803 | SET_TYPE_RM_MAX_VALUE | |
1804 | (gnu_type, | |
1805 | convert (TREE_TYPE (gnu_type), | |
1806 | elaborate_expression (Type_High_Bound (gnat_entity), | |
1807 | gnat_entity, get_identifier ("U"), | |
1808 | definition, true, | |
1809 | Needs_Debug_Info (gnat_entity)))); | |
a1ab4c31 AC |
1810 | |
1811 | /* One of the above calls might have caused us to be elaborated, | |
1812 | so don't blow up if so. */ | |
1813 | if (present_gnu_tree (gnat_entity)) | |
1814 | { | |
1815 | maybe_present = true; | |
1816 | break; | |
1817 | } | |
1818 | ||
a1ab4c31 AC |
1819 | /* Inherit our alias set from what we're a subtype of, as for |
1820 | integer subtypes. */ | |
794511d2 | 1821 | relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); |
a1ab4c31 AC |
1822 | } |
1823 | break; | |
1824 | ||
1825 | /* Array and String Types and Subtypes | |
1826 | ||
1827 | Unconstrained array types are represented by E_Array_Type and | |
1828 | constrained array types are represented by E_Array_Subtype. There | |
1829 | are no actual objects of an unconstrained array type; all we have | |
1830 | are pointers to that type. | |
1831 | ||
1832 | The following fields are defined on array types and subtypes: | |
1833 | ||
1834 | Component_Type Component type of the array. | |
1835 | Number_Dimensions Number of dimensions (an int). | |
1836 | First_Index Type of first index. */ | |
1837 | ||
1838 | case E_String_Type: | |
1839 | case E_Array_Type: | |
1840 | { | |
40c88b94 | 1841 | Entity_Id gnat_index, gnat_name; |
4e6602a8 EB |
1842 | const bool convention_fortran_p |
1843 | = (Convention (gnat_entity) == Convention_Fortran); | |
1844 | const int ndim = Number_Dimensions (gnat_entity); | |
26383c64 EB |
1845 | tree gnu_template_fields = NULL_TREE; |
1846 | tree gnu_template_type = make_node (RECORD_TYPE); | |
a1ab4c31 | 1847 | tree gnu_template_reference; |
26383c64 EB |
1848 | tree gnu_ptr_template = build_pointer_type (gnu_template_type); |
1849 | tree gnu_fat_type = make_node (RECORD_TYPE); | |
1850 | tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree)); | |
1851 | tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree)); | |
2cac6017 | 1852 | tree gnu_max_size = size_one_node, gnu_max_size_unit, tem; |
4e6602a8 | 1853 | int index; |
a1ab4c31 AC |
1854 | |
1855 | TYPE_NAME (gnu_template_type) | |
1856 | = create_concat_name (gnat_entity, "XUB"); | |
1857 | ||
1858 | /* Make a node for the array. If we are not defining the array | |
1859 | suppress expanding incomplete types. */ | |
1860 | gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE); | |
1861 | ||
1862 | if (!definition) | |
8cd28148 EB |
1863 | { |
1864 | defer_incomplete_level++; | |
1865 | this_deferred = true; | |
1866 | } | |
a1ab4c31 AC |
1867 | |
1868 | /* Build the fat pointer type. Use a "void *" object instead of | |
1869 | a pointer to the array type since we don't have the array type | |
1870 | yet (it will reference the fat pointer via the bounds). */ | |
1871 | tem = chainon (chainon (NULL_TREE, | |
1872 | create_field_decl (get_identifier ("P_ARRAY"), | |
1873 | ptr_void_type_node, | |
da01bfee EB |
1874 | gnu_fat_type, NULL_TREE, |
1875 | NULL_TREE, 0, 0)), | |
a1ab4c31 AC |
1876 | create_field_decl (get_identifier ("P_BOUNDS"), |
1877 | gnu_ptr_template, | |
da01bfee EB |
1878 | gnu_fat_type, NULL_TREE, |
1879 | NULL_TREE, 0, 0)); | |
a1ab4c31 AC |
1880 | |
1881 | /* Make sure we can put this into a register. */ | |
1882 | TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE); | |
1883 | ||
032d1b71 EB |
1884 | /* Do not emit debug info for this record type since the types of its |
1885 | fields are still incomplete at this point. */ | |
1886 | finish_record_type (gnu_fat_type, tem, 0, false); | |
315cff15 | 1887 | TYPE_FAT_POINTER_P (gnu_fat_type) = 1; |
a1ab4c31 AC |
1888 | |
1889 | /* Build a reference to the template from a PLACEHOLDER_EXPR that | |
1890 | is the fat pointer. This will be used to access the individual | |
1891 | fields once we build them. */ | |
1892 | tem = build3 (COMPONENT_REF, gnu_ptr_template, | |
1893 | build0 (PLACEHOLDER_EXPR, gnu_fat_type), | |
910ad8de | 1894 | DECL_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE); |
a1ab4c31 AC |
1895 | gnu_template_reference |
1896 | = build_unary_op (INDIRECT_REF, gnu_template_type, tem); | |
1897 | TREE_READONLY (gnu_template_reference) = 1; | |
1898 | ||
4e6602a8 EB |
1899 | /* Now create the GCC type for each index and add the fields for that |
1900 | index to the template. */ | |
1901 | for (index = (convention_fortran_p ? ndim - 1 : 0), | |
1902 | gnat_index = First_Index (gnat_entity); | |
1903 | 0 <= index && index < ndim; | |
1904 | index += (convention_fortran_p ? - 1 : 1), | |
1905 | gnat_index = Next_Index (gnat_index)) | |
a1ab4c31 | 1906 | { |
4e6602a8 EB |
1907 | char field_name[16]; |
1908 | tree gnu_index_base_type | |
1909 | = get_unpadded_type (Base_Type (Etype (gnat_index))); | |
b6c056fe EB |
1910 | tree gnu_lb_field, gnu_hb_field, gnu_orig_min, gnu_orig_max; |
1911 | tree gnu_min, gnu_max, gnu_high; | |
4e6602a8 EB |
1912 | |
1913 | /* Make the FIELD_DECLs for the low and high bounds of this | |
1914 | type and then make extractions of these fields from the | |
a1ab4c31 AC |
1915 | template. */ |
1916 | sprintf (field_name, "LB%d", index); | |
b6c056fe EB |
1917 | gnu_lb_field = create_field_decl (get_identifier (field_name), |
1918 | gnu_index_base_type, | |
da01bfee EB |
1919 | gnu_template_type, NULL_TREE, |
1920 | NULL_TREE, 0, 0); | |
a1ab4c31 | 1921 | Sloc_to_locus (Sloc (gnat_entity), |
b6c056fe | 1922 | &DECL_SOURCE_LOCATION (gnu_lb_field)); |
4e6602a8 EB |
1923 | |
1924 | field_name[0] = 'U'; | |
b6c056fe EB |
1925 | gnu_hb_field = create_field_decl (get_identifier (field_name), |
1926 | gnu_index_base_type, | |
da01bfee EB |
1927 | gnu_template_type, NULL_TREE, |
1928 | NULL_TREE, 0, 0); | |
a1ab4c31 | 1929 | Sloc_to_locus (Sloc (gnat_entity), |
b6c056fe | 1930 | &DECL_SOURCE_LOCATION (gnu_hb_field)); |
a1ab4c31 | 1931 | |
b6c056fe | 1932 | gnu_temp_fields[index] = chainon (gnu_lb_field, gnu_hb_field); |
4e6602a8 EB |
1933 | |
1934 | /* We can't use build_component_ref here since the template type | |
1935 | isn't complete yet. */ | |
b6c056fe EB |
1936 | gnu_orig_min = build3 (COMPONENT_REF, gnu_index_base_type, |
1937 | gnu_template_reference, gnu_lb_field, | |
1938 | NULL_TREE); | |
1939 | gnu_orig_max = build3 (COMPONENT_REF, gnu_index_base_type, | |
1940 | gnu_template_reference, gnu_hb_field, | |
1941 | NULL_TREE); | |
1942 | TREE_READONLY (gnu_orig_min) = TREE_READONLY (gnu_orig_max) = 1; | |
1943 | ||
1944 | gnu_min = convert (sizetype, gnu_orig_min); | |
1945 | gnu_max = convert (sizetype, gnu_orig_max); | |
1946 | ||
1947 | /* Compute the size of this dimension. See the E_Array_Subtype | |
1948 | case below for the rationale. */ | |
1949 | gnu_high | |
1950 | = build3 (COND_EXPR, sizetype, | |
1951 | build2 (GE_EXPR, boolean_type_node, | |
1952 | gnu_orig_max, gnu_orig_min), | |
1953 | gnu_max, | |
1954 | size_binop (MINUS_EXPR, gnu_min, size_one_node)); | |
03b6f8a2 | 1955 | |
4e6602a8 | 1956 | /* Make a range type with the new range in the Ada base type. |
03b6f8a2 | 1957 | Then make an index type with the size range in sizetype. */ |
a1ab4c31 | 1958 | gnu_index_types[index] |
b6c056fe | 1959 | = create_index_type (gnu_min, gnu_high, |
4e6602a8 | 1960 | create_range_type (gnu_index_base_type, |
b6c056fe EB |
1961 | gnu_orig_min, |
1962 | gnu_orig_max), | |
a1ab4c31 | 1963 | gnat_entity); |
4e6602a8 EB |
1964 | |
1965 | /* Update the maximum size of the array in elements. */ | |
1966 | if (gnu_max_size) | |
1967 | { | |
1968 | tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); | |
1969 | tree gnu_min | |
1970 | = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type)); | |
1971 | tree gnu_max | |
1972 | = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type)); | |
1973 | tree gnu_this_max | |
1974 | = size_binop (MAX_EXPR, | |
1975 | size_binop (PLUS_EXPR, size_one_node, | |
1976 | size_binop (MINUS_EXPR, | |
1977 | gnu_max, gnu_min)), | |
1978 | size_zero_node); | |
1979 | ||
1980 | if (TREE_CODE (gnu_this_max) == INTEGER_CST | |
1981 | && TREE_OVERFLOW (gnu_this_max)) | |
1982 | gnu_max_size = NULL_TREE; | |
1983 | else | |
1984 | gnu_max_size | |
1985 | = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); | |
1986 | } | |
a1ab4c31 AC |
1987 | |
1988 | TYPE_NAME (gnu_index_types[index]) | |
1989 | = create_concat_name (gnat_entity, field_name); | |
1990 | } | |
1991 | ||
1992 | for (index = 0; index < ndim; index++) | |
1993 | gnu_template_fields | |
1994 | = chainon (gnu_template_fields, gnu_temp_fields[index]); | |
1995 | ||
1996 | /* Install all the fields into the template. */ | |
032d1b71 EB |
1997 | finish_record_type (gnu_template_type, gnu_template_fields, 0, |
1998 | debug_info_p); | |
a1ab4c31 AC |
1999 | TYPE_READONLY (gnu_template_type) = 1; |
2000 | ||
2001 | /* Now make the array of arrays and update the pointer to the array | |
2002 | in the fat pointer. Note that it is the first field. */ | |
86060344 | 2003 | tem = gnat_to_gnu_component_type (gnat_entity, definition, |
2cac6017 | 2004 | debug_info_p); |
a1ab4c31 AC |
2005 | |
2006 | /* If Component_Size is not already specified, annotate it with the | |
2007 | size of the component. */ | |
2008 | if (Unknown_Component_Size (gnat_entity)) | |
2009 | Set_Component_Size (gnat_entity, annotate_value (TYPE_SIZE (tem))); | |
2010 | ||
4e6602a8 EB |
2011 | /* Compute the maximum size of the array in units and bits. */ |
2012 | if (gnu_max_size) | |
2013 | { | |
2014 | gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, | |
2015 | TYPE_SIZE_UNIT (tem)); | |
2016 | gnu_max_size = size_binop (MULT_EXPR, | |
2017 | convert (bitsizetype, gnu_max_size), | |
2018 | TYPE_SIZE (tem)); | |
2019 | } | |
2020 | else | |
2021 | gnu_max_size_unit = NULL_TREE; | |
a1ab4c31 | 2022 | |
4e6602a8 | 2023 | /* Now build the array type. */ |
a1ab4c31 AC |
2024 | for (index = ndim - 1; index >= 0; index--) |
2025 | { | |
2026 | tem = build_array_type (tem, gnu_index_types[index]); | |
2027 | TYPE_MULTI_ARRAY_P (tem) = (index > 0); | |
d8e94f79 | 2028 | if (array_type_has_nonaliased_component (tem, gnat_entity)) |
a1ab4c31 AC |
2029 | TYPE_NONALIASED_COMPONENT (tem) = 1; |
2030 | } | |
2031 | ||
feec4372 EB |
2032 | /* If an alignment is specified, use it if valid. But ignore it |
2033 | for the original type of packed array types. If the alignment | |
2034 | was requested with an explicit alignment clause, state so. */ | |
a1ab4c31 AC |
2035 | if (No (Packed_Array_Type (gnat_entity)) |
2036 | && Known_Alignment (gnat_entity)) | |
2037 | { | |
a1ab4c31 AC |
2038 | TYPE_ALIGN (tem) |
2039 | = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
2040 | TYPE_ALIGN (tem)); | |
2041 | if (Present (Alignment_Clause (gnat_entity))) | |
2042 | TYPE_USER_ALIGN (tem) = 1; | |
2043 | } | |
2044 | ||
4e6602a8 | 2045 | TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p; |
a1ab4c31 AC |
2046 | TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem); |
2047 | ||
2048 | /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the | |
2049 | corresponding fat pointer. */ | |
2050 | TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) | |
2051 | = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type; | |
6f9f0ce3 | 2052 | SET_TYPE_MODE (gnu_type, BLKmode); |
a1ab4c31 AC |
2053 | TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem); |
2054 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type); | |
2055 | ||
2056 | /* If the maximum size doesn't overflow, use it. */ | |
86060344 | 2057 | if (gnu_max_size |
4e6602a8 EB |
2058 | && TREE_CODE (gnu_max_size) == INTEGER_CST |
2059 | && !TREE_OVERFLOW (gnu_max_size) | |
2060 | && TREE_CODE (gnu_max_size_unit) == INTEGER_CST | |
a1ab4c31 | 2061 | && !TREE_OVERFLOW (gnu_max_size_unit)) |
4e6602a8 EB |
2062 | { |
2063 | TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size, | |
2064 | TYPE_SIZE (tem)); | |
2065 | TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit, | |
2066 | TYPE_SIZE_UNIT (tem)); | |
2067 | } | |
a1ab4c31 AC |
2068 | |
2069 | create_type_decl (create_concat_name (gnat_entity, "XUA"), | |
2070 | tem, NULL, !Comes_From_Source (gnat_entity), | |
2071 | debug_info_p, gnat_entity); | |
2072 | ||
40c88b94 EB |
2073 | /* Give the fat pointer type a name. If this is a packed type, tell |
2074 | the debugger how to interpret the underlying bits. */ | |
2075 | if (Present (Packed_Array_Type (gnat_entity))) | |
2076 | gnat_name = Packed_Array_Type (gnat_entity); | |
2077 | else | |
2078 | gnat_name = gnat_entity; | |
2079 | create_type_decl (create_concat_name (gnat_name, "XUP"), | |
10069d53 | 2080 | gnu_fat_type, NULL, true, |
a1ab4c31 AC |
2081 | debug_info_p, gnat_entity); |
2082 | ||
86060344 EB |
2083 | /* Create the type to be used as what a thin pointer designates: |
2084 | a record type for the object and its template with the fields | |
2085 | shifted to have the template at a negative offset. */ | |
a1ab4c31 | 2086 | tem = build_unc_object_type (gnu_template_type, tem, |
928dfa4b EB |
2087 | create_concat_name (gnat_name, "XUT"), |
2088 | debug_info_p); | |
a1ab4c31 AC |
2089 | shift_unc_components_for_thin_pointers (tem); |
2090 | ||
2091 | SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type); | |
2092 | TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem; | |
a1ab4c31 AC |
2093 | } |
2094 | break; | |
2095 | ||
2096 | case E_String_Subtype: | |
2097 | case E_Array_Subtype: | |
2098 | ||
2099 | /* This is the actual data type for array variables. Multidimensional | |
4e6602a8 | 2100 | arrays are implemented as arrays of arrays. Note that arrays which |
7c20033e | 2101 | have sparse enumeration subtypes as index components create sparse |
4e6602a8 EB |
2102 | arrays, which is obviously space inefficient but so much easier to |
2103 | code for now. | |
a1ab4c31 | 2104 | |
4e6602a8 EB |
2105 | Also note that the subtype never refers to the unconstrained array |
2106 | type, which is somewhat at variance with Ada semantics. | |
a1ab4c31 | 2107 | |
4e6602a8 EB |
2108 | First check to see if this is simply a renaming of the array type. |
2109 | If so, the result is the array type. */ | |
a1ab4c31 AC |
2110 | |
2111 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
2112 | if (!Is_Constrained (gnat_entity)) | |
7c20033e | 2113 | ; |
a1ab4c31 AC |
2114 | else |
2115 | { | |
4e6602a8 EB |
2116 | Entity_Id gnat_index, gnat_base_index; |
2117 | const bool convention_fortran_p | |
2118 | = (Convention (gnat_entity) == Convention_Fortran); | |
2119 | const int ndim = Number_Dimensions (gnat_entity); | |
a1ab4c31 | 2120 | tree gnu_base_type = gnu_type; |
4e6602a8 | 2121 | tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree)); |
26383c64 | 2122 | tree gnu_max_size = size_one_node, gnu_max_size_unit; |
a1ab4c31 | 2123 | bool need_index_type_struct = false; |
4e6602a8 | 2124 | int index; |
a1ab4c31 | 2125 | |
4e6602a8 EB |
2126 | /* First create the GCC type for each index and find out whether |
2127 | special types are needed for debugging information. */ | |
2128 | for (index = (convention_fortran_p ? ndim - 1 : 0), | |
2129 | gnat_index = First_Index (gnat_entity), | |
2130 | gnat_base_index | |
a1ab4c31 | 2131 | = First_Index (Implementation_Base_Type (gnat_entity)); |
4e6602a8 EB |
2132 | 0 <= index && index < ndim; |
2133 | index += (convention_fortran_p ? - 1 : 1), | |
2134 | gnat_index = Next_Index (gnat_index), | |
2135 | gnat_base_index = Next_Index (gnat_base_index)) | |
a1ab4c31 | 2136 | { |
4e6602a8 EB |
2137 | tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); |
2138 | tree gnu_orig_min = TYPE_MIN_VALUE (gnu_index_type); | |
2139 | tree gnu_orig_max = TYPE_MAX_VALUE (gnu_index_type); | |
2140 | tree gnu_min = convert (sizetype, gnu_orig_min); | |
2141 | tree gnu_max = convert (sizetype, gnu_orig_max); | |
2142 | tree gnu_base_index_type | |
2143 | = get_unpadded_type (Etype (gnat_base_index)); | |
2144 | tree gnu_base_orig_min = TYPE_MIN_VALUE (gnu_base_index_type); | |
2145 | tree gnu_base_orig_max = TYPE_MAX_VALUE (gnu_base_index_type); | |
728936bb | 2146 | tree gnu_high; |
4e6602a8 EB |
2147 | |
2148 | /* See if the base array type is already flat. If it is, we | |
2149 | are probably compiling an ACATS test but it will cause the | |
2150 | code below to malfunction if we don't handle it specially. */ | |
2151 | if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST | |
2152 | && TREE_CODE (gnu_base_orig_max) == INTEGER_CST | |
2153 | && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min)) | |
a1ab4c31 | 2154 | { |
4e6602a8 EB |
2155 | gnu_min = size_one_node; |
2156 | gnu_max = size_zero_node; | |
feec4372 | 2157 | gnu_high = gnu_max; |
a1ab4c31 AC |
2158 | } |
2159 | ||
4e6602a8 EB |
2160 | /* Similarly, if one of the values overflows in sizetype and the |
2161 | range is null, use 1..0 for the sizetype bounds. */ | |
728936bb | 2162 | else if (TREE_CODE (gnu_min) == INTEGER_CST |
a1ab4c31 AC |
2163 | && TREE_CODE (gnu_max) == INTEGER_CST |
2164 | && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max)) | |
4e6602a8 | 2165 | && tree_int_cst_lt (gnu_orig_max, gnu_orig_min)) |
feec4372 EB |
2166 | { |
2167 | gnu_min = size_one_node; | |
2168 | gnu_max = size_zero_node; | |
2169 | gnu_high = gnu_max; | |
2170 | } | |
a1ab4c31 | 2171 | |
4e6602a8 EB |
2172 | /* If the minimum and maximum values both overflow in sizetype, |
2173 | but the difference in the original type does not overflow in | |
2174 | sizetype, ignore the overflow indication. */ | |
728936bb | 2175 | else if (TREE_CODE (gnu_min) == INTEGER_CST |
4e6602a8 EB |
2176 | && TREE_CODE (gnu_max) == INTEGER_CST |
2177 | && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max) | |
2178 | && !TREE_OVERFLOW | |
2179 | (convert (sizetype, | |
2180 | fold_build2 (MINUS_EXPR, gnu_index_type, | |
2181 | gnu_orig_max, | |
2182 | gnu_orig_min)))) | |
feec4372 | 2183 | { |
4e6602a8 EB |
2184 | TREE_OVERFLOW (gnu_min) = 0; |
2185 | TREE_OVERFLOW (gnu_max) = 0; | |
feec4372 EB |
2186 | gnu_high = gnu_max; |
2187 | } | |
2188 | ||
f45f9664 EB |
2189 | /* Compute the size of this dimension in the general case. We |
2190 | need to provide GCC with an upper bound to use but have to | |
2191 | deal with the "superflat" case. There are three ways to do | |
2192 | this. If we can prove that the array can never be superflat, | |
2193 | we can just use the high bound of the index type. */ | |
728936bb EB |
2194 | else if ((Nkind (gnat_index) == N_Range |
2195 | && cannot_be_superflat_p (gnat_index)) | |
2196 | /* Packed Array Types are never superflat. */ | |
2197 | || Is_Packed_Array_Type (gnat_entity)) | |
f45f9664 EB |
2198 | gnu_high = gnu_max; |
2199 | ||
728936bb EB |
2200 | /* Otherwise, if the high bound is constant but the low bound is |
2201 | not, we use the expression (hb >= lb) ? lb : hb + 1 for the | |
2202 | lower bound. Note that the comparison must be done in the | |
2203 | original type to avoid any overflow during the conversion. */ | |
2204 | else if (TREE_CODE (gnu_max) == INTEGER_CST | |
2205 | && TREE_CODE (gnu_min) != INTEGER_CST) | |
feec4372 | 2206 | { |
728936bb EB |
2207 | gnu_high = gnu_max; |
2208 | gnu_min | |
2209 | = build_cond_expr (sizetype, | |
2210 | build_binary_op (GE_EXPR, | |
2211 | boolean_type_node, | |
2212 | gnu_orig_max, | |
2213 | gnu_orig_min), | |
2214 | gnu_min, | |
2215 | size_binop (PLUS_EXPR, gnu_max, | |
2216 | size_one_node)); | |
feec4372 | 2217 | } |
a1ab4c31 | 2218 | |
728936bb EB |
2219 | /* Finally we use (hb >= lb) ? hb : lb - 1 for the upper bound |
2220 | in all the other cases. Note that, here as well as above, | |
2221 | the condition used in the comparison must be equivalent to | |
2222 | the condition (length != 0). This is relied upon in order | |
2223 | to optimize array comparisons in compare_arrays. */ | |
2224 | else | |
2225 | gnu_high | |
2226 | = build_cond_expr (sizetype, | |
2227 | build_binary_op (GE_EXPR, | |
2228 | boolean_type_node, | |
2229 | gnu_orig_max, | |
2230 | gnu_orig_min), | |
2231 | gnu_max, | |
2232 | size_binop (MINUS_EXPR, gnu_min, | |
2233 | size_one_node)); | |
2234 | ||
b6c056fe EB |
2235 | /* Reuse the index type for the range type. Then make an index |
2236 | type with the size range in sizetype. */ | |
4e6602a8 EB |
2237 | gnu_index_types[index] |
2238 | = create_index_type (gnu_min, gnu_high, gnu_index_type, | |
a1ab4c31 AC |
2239 | gnat_entity); |
2240 | ||
4e6602a8 | 2241 | /* Update the maximum size of the array in elements. Here we |
a1ab4c31 | 2242 | see if any constraint on the index type of the base type |
4e6602a8 EB |
2243 | can be used in the case of self-referential bound on the |
2244 | index type of the subtype. We look for a non-"infinite" | |
a1ab4c31 AC |
2245 | and non-self-referential bound from any type involved and |
2246 | handle each bound separately. */ | |
4e6602a8 EB |
2247 | if (gnu_max_size) |
2248 | { | |
2249 | tree gnu_base_min = convert (sizetype, gnu_base_orig_min); | |
2250 | tree gnu_base_max = convert (sizetype, gnu_base_orig_max); | |
2251 | tree gnu_base_index_base_type | |
2252 | = get_base_type (gnu_base_index_type); | |
2253 | tree gnu_base_base_min | |
2254 | = convert (sizetype, | |
2255 | TYPE_MIN_VALUE (gnu_base_index_base_type)); | |
2256 | tree gnu_base_base_max | |
2257 | = convert (sizetype, | |
2258 | TYPE_MAX_VALUE (gnu_base_index_base_type)); | |
2259 | ||
2260 | if (!CONTAINS_PLACEHOLDER_P (gnu_min) | |
2261 | || !(TREE_CODE (gnu_base_min) == INTEGER_CST | |
2262 | && !TREE_OVERFLOW (gnu_base_min))) | |
2263 | gnu_base_min = gnu_min; | |
2264 | ||
2265 | if (!CONTAINS_PLACEHOLDER_P (gnu_max) | |
2266 | || !(TREE_CODE (gnu_base_max) == INTEGER_CST | |
2267 | && !TREE_OVERFLOW (gnu_base_max))) | |
2268 | gnu_base_max = gnu_max; | |
2269 | ||
2270 | if ((TREE_CODE (gnu_base_min) == INTEGER_CST | |
2271 | && TREE_OVERFLOW (gnu_base_min)) | |
2272 | || operand_equal_p (gnu_base_min, gnu_base_base_min, 0) | |
2273 | || (TREE_CODE (gnu_base_max) == INTEGER_CST | |
2274 | && TREE_OVERFLOW (gnu_base_max)) | |
2275 | || operand_equal_p (gnu_base_max, gnu_base_base_max, 0)) | |
2276 | gnu_max_size = NULL_TREE; | |
2277 | else | |
2278 | { | |
2279 | tree gnu_this_max | |
2280 | = size_binop (MAX_EXPR, | |
2281 | size_binop (PLUS_EXPR, size_one_node, | |
2282 | size_binop (MINUS_EXPR, | |
2283 | gnu_base_max, | |
2284 | gnu_base_min)), | |
2285 | size_zero_node); | |
2286 | ||
2287 | if (TREE_CODE (gnu_this_max) == INTEGER_CST | |
2288 | && TREE_OVERFLOW (gnu_this_max)) | |
2289 | gnu_max_size = NULL_TREE; | |
2290 | else | |
2291 | gnu_max_size | |
2292 | = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); | |
2293 | } | |
2294 | } | |
a1ab4c31 | 2295 | |
4e6602a8 EB |
2296 | /* We need special types for debugging information to point to |
2297 | the index types if they have variable bounds, are not integer | |
2298 | types, are biased or are wider than sizetype. */ | |
2299 | if (!integer_onep (gnu_orig_min) | |
2300 | || TREE_CODE (gnu_orig_max) != INTEGER_CST | |
2301 | || TREE_CODE (gnu_index_type) != INTEGER_TYPE | |
2302 | || (TREE_TYPE (gnu_index_type) | |
2303 | && TREE_CODE (TREE_TYPE (gnu_index_type)) | |
2304 | != INTEGER_TYPE) | |
2305 | || TYPE_BIASED_REPRESENTATION_P (gnu_index_type) | |
728936bb EB |
2306 | || compare_tree_int (rm_size (gnu_index_type), |
2307 | TYPE_PRECISION (sizetype)) > 0) | |
a1ab4c31 AC |
2308 | need_index_type_struct = true; |
2309 | } | |
2310 | ||
2311 | /* Then flatten: create the array of arrays. For an array type | |
2312 | used to implement a packed array, get the component type from | |
2313 | the original array type since the representation clauses that | |
2314 | can affect it are on the latter. */ | |
2315 | if (Is_Packed_Array_Type (gnat_entity) | |
2316 | && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) | |
2317 | { | |
2318 | gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity)); | |
4e6602a8 | 2319 | for (index = ndim - 1; index >= 0; index--) |
a1ab4c31 AC |
2320 | gnu_type = TREE_TYPE (gnu_type); |
2321 | ||
2322 | /* One of the above calls might have caused us to be elaborated, | |
2323 | so don't blow up if so. */ | |
2324 | if (present_gnu_tree (gnat_entity)) | |
2325 | { | |
2326 | maybe_present = true; | |
2327 | break; | |
2328 | } | |
2329 | } | |
2330 | else | |
2331 | { | |
2cac6017 EB |
2332 | gnu_type = gnat_to_gnu_component_type (gnat_entity, definition, |
2333 | debug_info_p); | |
a1ab4c31 AC |
2334 | |
2335 | /* One of the above calls might have caused us to be elaborated, | |
2336 | so don't blow up if so. */ | |
2337 | if (present_gnu_tree (gnat_entity)) | |
2338 | { | |
2339 | maybe_present = true; | |
2340 | break; | |
2341 | } | |
a1ab4c31 AC |
2342 | } |
2343 | ||
4e6602a8 EB |
2344 | /* Compute the maximum size of the array in units and bits. */ |
2345 | if (gnu_max_size) | |
2346 | { | |
2347 | gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, | |
2348 | TYPE_SIZE_UNIT (gnu_type)); | |
2349 | gnu_max_size = size_binop (MULT_EXPR, | |
2350 | convert (bitsizetype, gnu_max_size), | |
2351 | TYPE_SIZE (gnu_type)); | |
2352 | } | |
2353 | else | |
2354 | gnu_max_size_unit = NULL_TREE; | |
a1ab4c31 | 2355 | |
4e6602a8 EB |
2356 | /* Now build the array type. */ |
2357 | for (index = ndim - 1; index >= 0; index --) | |
a1ab4c31 | 2358 | { |
4e6602a8 | 2359 | gnu_type = build_array_type (gnu_type, gnu_index_types[index]); |
a1ab4c31 | 2360 | TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0); |
d8e94f79 | 2361 | if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) |
a1ab4c31 AC |
2362 | TYPE_NONALIASED_COMPONENT (gnu_type) = 1; |
2363 | } | |
2364 | ||
10069d53 | 2365 | /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ |
4fd78fe6 EB |
2366 | TYPE_STUB_DECL (gnu_type) |
2367 | = create_type_stub_decl (gnu_entity_name, gnu_type); | |
10069d53 | 2368 | |
4e6602a8 EB |
2369 | /* If we are at file level and this is a multi-dimensional array, |
2370 | we need to make a variable corresponding to the stride of the | |
a1ab4c31 | 2371 | inner dimensions. */ |
4e6602a8 | 2372 | if (global_bindings_p () && ndim > 1) |
a1ab4c31 | 2373 | { |
da01bfee | 2374 | tree gnu_st_name = get_identifier ("ST"); |
a1ab4c31 AC |
2375 | tree gnu_arr_type; |
2376 | ||
2377 | for (gnu_arr_type = TREE_TYPE (gnu_type); | |
2378 | TREE_CODE (gnu_arr_type) == ARRAY_TYPE; | |
2379 | gnu_arr_type = TREE_TYPE (gnu_arr_type), | |
da01bfee | 2380 | gnu_st_name = concat_name (gnu_st_name, "ST")) |
a1ab4c31 AC |
2381 | { |
2382 | tree eltype = TREE_TYPE (gnu_arr_type); | |
2383 | ||
2384 | TYPE_SIZE (gnu_arr_type) | |
a531043b | 2385 | = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type), |
da01bfee | 2386 | gnat_entity, gnu_st_name, |
a531043b | 2387 | definition, false); |
a1ab4c31 AC |
2388 | |
2389 | /* ??? For now, store the size as a multiple of the | |
2390 | alignment of the element type in bytes so that we | |
2391 | can see the alignment from the tree. */ | |
2392 | TYPE_SIZE_UNIT (gnu_arr_type) | |
da01bfee EB |
2393 | = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_arr_type), |
2394 | gnat_entity, | |
2395 | concat_name (gnu_st_name, "A_U"), | |
2396 | definition, false, | |
2397 | TYPE_ALIGN (eltype)); | |
a1ab4c31 AC |
2398 | |
2399 | /* ??? create_type_decl is not invoked on the inner types so | |
2400 | the MULT_EXPR node built above will never be marked. */ | |
3f13dd77 | 2401 | MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type)); |
a1ab4c31 AC |
2402 | } |
2403 | } | |
2404 | ||
4fd78fe6 EB |
2405 | /* If we need to write out a record type giving the names of the |
2406 | bounds for debugging purposes, do it now and make the record | |
2407 | type a parallel type. This is not needed for a packed array | |
2408 | since the bounds are conveyed by the original array type. */ | |
2409 | if (need_index_type_struct | |
2410 | && debug_info_p | |
2411 | && !Is_Packed_Array_Type (gnat_entity)) | |
a1ab4c31 | 2412 | { |
10069d53 | 2413 | tree gnu_bound_rec = make_node (RECORD_TYPE); |
a1ab4c31 AC |
2414 | tree gnu_field_list = NULL_TREE; |
2415 | tree gnu_field; | |
2416 | ||
10069d53 | 2417 | TYPE_NAME (gnu_bound_rec) |
a1ab4c31 AC |
2418 | = create_concat_name (gnat_entity, "XA"); |
2419 | ||
4e6602a8 | 2420 | for (index = ndim - 1; index >= 0; index--) |
a1ab4c31 | 2421 | { |
4e6602a8 | 2422 | tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]); |
10069d53 | 2423 | tree gnu_index_name = TYPE_NAME (gnu_index); |
a1ab4c31 | 2424 | |
10069d53 EB |
2425 | if (TREE_CODE (gnu_index_name) == TYPE_DECL) |
2426 | gnu_index_name = DECL_NAME (gnu_index_name); | |
a1ab4c31 | 2427 | |
4fd78fe6 EB |
2428 | /* Make sure to reference the types themselves, and not just |
2429 | their names, as the debugger may fall back on them. */ | |
10069d53 | 2430 | gnu_field = create_field_decl (gnu_index_name, gnu_index, |
da01bfee EB |
2431 | gnu_bound_rec, NULL_TREE, |
2432 | NULL_TREE, 0, 0); | |
910ad8de | 2433 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 AC |
2434 | gnu_field_list = gnu_field; |
2435 | } | |
2436 | ||
032d1b71 | 2437 | finish_record_type (gnu_bound_rec, gnu_field_list, 0, true); |
10069d53 | 2438 | add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec); |
a1ab4c31 AC |
2439 | } |
2440 | ||
4fd78fe6 EB |
2441 | /* Otherwise, for a packed array, make the original array type a |
2442 | parallel type. */ | |
2443 | else if (debug_info_p | |
2444 | && Is_Packed_Array_Type (gnat_entity) | |
2445 | && present_gnu_tree (Original_Array_Type (gnat_entity))) | |
2446 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
2447 | gnat_to_gnu_type | |
2448 | (Original_Array_Type (gnat_entity))); | |
2449 | ||
4e6602a8 | 2450 | TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p; |
a1ab4c31 AC |
2451 | TYPE_PACKED_ARRAY_TYPE_P (gnu_type) |
2452 | = (Is_Packed_Array_Type (gnat_entity) | |
2453 | && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))); | |
2454 | ||
4e6602a8 | 2455 | /* If the size is self-referential and the maximum size doesn't |
a1ab4c31 AC |
2456 | overflow, use it. */ |
2457 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) | |
4e6602a8 | 2458 | && gnu_max_size |
a1ab4c31 AC |
2459 | && !(TREE_CODE (gnu_max_size) == INTEGER_CST |
2460 | && TREE_OVERFLOW (gnu_max_size)) | |
2461 | && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST | |
4e6602a8 | 2462 | && TREE_OVERFLOW (gnu_max_size_unit))) |
a1ab4c31 AC |
2463 | { |
2464 | TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size, | |
2465 | TYPE_SIZE (gnu_type)); | |
2466 | TYPE_SIZE_UNIT (gnu_type) | |
2467 | = size_binop (MIN_EXPR, gnu_max_size_unit, | |
2468 | TYPE_SIZE_UNIT (gnu_type)); | |
2469 | } | |
2470 | ||
2471 | /* Set our alias set to that of our base type. This gives all | |
2472 | array subtypes the same alias set. */ | |
794511d2 | 2473 | relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY); |
a1ab4c31 | 2474 | |
7c20033e EB |
2475 | /* If this is a packed type, make this type the same as the packed |
2476 | array type, but do some adjusting in the type first. */ | |
2477 | if (Present (Packed_Array_Type (gnat_entity))) | |
a1ab4c31 | 2478 | { |
7c20033e EB |
2479 | Entity_Id gnat_index; |
2480 | tree gnu_inner; | |
2481 | ||
2482 | /* First finish the type we had been making so that we output | |
2483 | debugging information for it. */ | |
2484 | if (Treat_As_Volatile (gnat_entity)) | |
2485 | gnu_type | |
2486 | = build_qualified_type (gnu_type, | |
2487 | TYPE_QUALS (gnu_type) | |
2488 | | TYPE_QUAL_VOLATILE); | |
2489 | ||
2490 | /* Make it artificial only if the base type was artificial too. | |
2491 | That's sort of "morally" true and will make it possible for | |
2492 | the debugger to look it up by name in DWARF, which is needed | |
2493 | in order to decode the packed array type. */ | |
2494 | gnu_decl | |
2495 | = create_type_decl (gnu_entity_name, gnu_type, attr_list, | |
2496 | !Comes_From_Source (Etype (gnat_entity)) | |
2497 | && !Comes_From_Source (gnat_entity), | |
2498 | debug_info_p, gnat_entity); | |
2499 | ||
2500 | /* Save it as our equivalent in case the call below elaborates | |
2501 | this type again. */ | |
2502 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
2503 | ||
2504 | gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity), | |
2505 | NULL_TREE, 0); | |
2506 | this_made_decl = true; | |
2507 | gnu_type = TREE_TYPE (gnu_decl); | |
2508 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
2509 | ||
2510 | gnu_inner = gnu_type; | |
2511 | while (TREE_CODE (gnu_inner) == RECORD_TYPE | |
2512 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner) | |
315cff15 | 2513 | || TYPE_PADDING_P (gnu_inner))) |
7c20033e EB |
2514 | gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner)); |
2515 | ||
2516 | /* We need to attach the index type to the type we just made so | |
2517 | that the actual bounds can later be put into a template. */ | |
2518 | if ((TREE_CODE (gnu_inner) == ARRAY_TYPE | |
2519 | && !TYPE_ACTUAL_BOUNDS (gnu_inner)) | |
2520 | || (TREE_CODE (gnu_inner) == INTEGER_TYPE | |
2521 | && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner))) | |
a1ab4c31 | 2522 | { |
7c20033e | 2523 | if (TREE_CODE (gnu_inner) == INTEGER_TYPE) |
a1ab4c31 | 2524 | { |
7c20033e EB |
2525 | /* The TYPE_ACTUAL_BOUNDS field is overloaded with the |
2526 | TYPE_MODULUS for modular types so we make an extra | |
2527 | subtype if necessary. */ | |
2528 | if (TYPE_MODULAR_P (gnu_inner)) | |
2529 | { | |
2530 | tree gnu_subtype | |
2531 | = make_unsigned_type (TYPE_PRECISION (gnu_inner)); | |
2532 | TREE_TYPE (gnu_subtype) = gnu_inner; | |
2533 | TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; | |
2534 | SET_TYPE_RM_MIN_VALUE (gnu_subtype, | |
2535 | TYPE_MIN_VALUE (gnu_inner)); | |
2536 | SET_TYPE_RM_MAX_VALUE (gnu_subtype, | |
2537 | TYPE_MAX_VALUE (gnu_inner)); | |
2538 | gnu_inner = gnu_subtype; | |
2539 | } | |
2540 | ||
2541 | TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1; | |
26383c64 EB |
2542 | |
2543 | #ifdef ENABLE_CHECKING | |
7c20033e EB |
2544 | /* Check for other cases of overloading. */ |
2545 | gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner)); | |
26383c64 | 2546 | #endif |
7c20033e | 2547 | } |
a1ab4c31 | 2548 | |
7c20033e EB |
2549 | for (gnat_index = First_Index (gnat_entity); |
2550 | Present (gnat_index); | |
2551 | gnat_index = Next_Index (gnat_index)) | |
2552 | SET_TYPE_ACTUAL_BOUNDS | |
2553 | (gnu_inner, | |
2554 | tree_cons (NULL_TREE, | |
2555 | get_unpadded_type (Etype (gnat_index)), | |
2556 | TYPE_ACTUAL_BOUNDS (gnu_inner))); | |
2557 | ||
2558 | if (Convention (gnat_entity) != Convention_Fortran) | |
2559 | SET_TYPE_ACTUAL_BOUNDS | |
2560 | (gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner))); | |
2561 | ||
2562 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
2563 | && TYPE_JUSTIFIED_MODULAR_P (gnu_type)) | |
2564 | TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner; | |
2565 | } | |
a1ab4c31 | 2566 | } |
a1ab4c31 | 2567 | |
7c20033e EB |
2568 | else |
2569 | /* Abort if packed array with no Packed_Array_Type field set. */ | |
2570 | gcc_assert (!Is_Packed (gnat_entity)); | |
2571 | } | |
a1ab4c31 AC |
2572 | break; |
2573 | ||
2574 | case E_String_Literal_Subtype: | |
2ddc34ba | 2575 | /* Create the type for a string literal. */ |
a1ab4c31 AC |
2576 | { |
2577 | Entity_Id gnat_full_type | |
2578 | = (IN (Ekind (Etype (gnat_entity)), Private_Kind) | |
2579 | && Present (Full_View (Etype (gnat_entity))) | |
2580 | ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity)); | |
2581 | tree gnu_string_type = get_unpadded_type (gnat_full_type); | |
2582 | tree gnu_string_array_type | |
2583 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type)))); | |
2584 | tree gnu_string_index_type | |
2585 | = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE | |
2586 | (TYPE_DOMAIN (gnu_string_array_type)))); | |
2587 | tree gnu_lower_bound | |
2588 | = convert (gnu_string_index_type, | |
2589 | gnat_to_gnu (String_Literal_Low_Bound (gnat_entity))); | |
2590 | int length = UI_To_Int (String_Literal_Length (gnat_entity)); | |
2591 | tree gnu_length = ssize_int (length - 1); | |
2592 | tree gnu_upper_bound | |
2593 | = build_binary_op (PLUS_EXPR, gnu_string_index_type, | |
2594 | gnu_lower_bound, | |
2595 | convert (gnu_string_index_type, gnu_length)); | |
a1ab4c31 | 2596 | tree gnu_index_type |
c1abd261 EB |
2597 | = create_index_type (convert (sizetype, gnu_lower_bound), |
2598 | convert (sizetype, gnu_upper_bound), | |
84fb43a1 EB |
2599 | create_range_type (gnu_string_index_type, |
2600 | gnu_lower_bound, | |
2601 | gnu_upper_bound), | |
c1abd261 | 2602 | gnat_entity); |
a1ab4c31 AC |
2603 | |
2604 | gnu_type | |
2605 | = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)), | |
2606 | gnu_index_type); | |
d8e94f79 | 2607 | if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) |
c3734896 | 2608 | TYPE_NONALIASED_COMPONENT (gnu_type) = 1; |
794511d2 | 2609 | relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY); |
a1ab4c31 AC |
2610 | } |
2611 | break; | |
2612 | ||
2613 | /* Record Types and Subtypes | |
2614 | ||
2615 | The following fields are defined on record types: | |
2616 | ||
2617 | Has_Discriminants True if the record has discriminants | |
2618 | First_Discriminant Points to head of list of discriminants | |
2619 | First_Entity Points to head of list of fields | |
2620 | Is_Tagged_Type True if the record is tagged | |
2621 | ||
2622 | Implementation of Ada records and discriminated records: | |
2623 | ||
2624 | A record type definition is transformed into the equivalent of a C | |
2625 | struct definition. The fields that are the discriminants which are | |
2626 | found in the Full_Type_Declaration node and the elements of the | |
2627 | Component_List found in the Record_Type_Definition node. The | |
2628 | Component_List can be a recursive structure since each Variant of | |
2629 | the Variant_Part of the Component_List has a Component_List. | |
2630 | ||
2631 | Processing of a record type definition comprises starting the list of | |
2632 | field declarations here from the discriminants and the calling the | |
2633 | function components_to_record to add the rest of the fields from the | |
2ddc34ba | 2634 | component list and return the gnu type node. The function |
a1ab4c31 AC |
2635 | components_to_record will call itself recursively as it traverses |
2636 | the tree. */ | |
2637 | ||
2638 | case E_Record_Type: | |
2639 | if (Has_Complex_Representation (gnat_entity)) | |
2640 | { | |
2641 | gnu_type | |
2642 | = build_complex_type | |
2643 | (get_unpadded_type | |
2644 | (Etype (Defining_Entity | |
2645 | (First (Component_Items | |
2646 | (Component_List | |
2647 | (Type_Definition | |
2648 | (Declaration_Node (gnat_entity))))))))); | |
2649 | ||
2650 | break; | |
2651 | } | |
2652 | ||
2653 | { | |
2654 | Node_Id full_definition = Declaration_Node (gnat_entity); | |
2655 | Node_Id record_definition = Type_Definition (full_definition); | |
2656 | Entity_Id gnat_field; | |
c244bf8f | 2657 | tree gnu_field, gnu_field_list = NULL_TREE, gnu_get_parent; |
a1ab4c31 AC |
2658 | /* Set PACKED in keeping with gnat_to_gnu_field. */ |
2659 | int packed | |
2660 | = Is_Packed (gnat_entity) | |
2661 | ? 1 | |
2662 | : Component_Alignment (gnat_entity) == Calign_Storage_Unit | |
2663 | ? -1 | |
2664 | : (Known_Alignment (gnat_entity) | |
2665 | || (Strict_Alignment (gnat_entity) | |
2666 | && Known_Static_Esize (gnat_entity))) | |
2667 | ? -2 | |
2668 | : 0; | |
c244bf8f | 2669 | bool has_discr = Has_Discriminants (gnat_entity); |
a1ab4c31 AC |
2670 | bool has_rep = Has_Specified_Layout (gnat_entity); |
2671 | bool all_rep = has_rep; | |
2672 | bool is_extension | |
2673 | = (Is_Tagged_Type (gnat_entity) | |
2674 | && Nkind (record_definition) == N_Derived_Type_Definition); | |
8cd28148 | 2675 | bool is_unchecked_union = Is_Unchecked_Union (gnat_entity); |
a1ab4c31 AC |
2676 | |
2677 | /* See if all fields have a rep clause. Stop when we find one | |
2678 | that doesn't. */ | |
8cd28148 EB |
2679 | if (all_rep) |
2680 | for (gnat_field = First_Entity (gnat_entity); | |
2681 | Present (gnat_field); | |
2682 | gnat_field = Next_Entity (gnat_field)) | |
2683 | if ((Ekind (gnat_field) == E_Component | |
2684 | || Ekind (gnat_field) == E_Discriminant) | |
2685 | && No (Component_Clause (gnat_field))) | |
2686 | { | |
2687 | all_rep = false; | |
2688 | break; | |
2689 | } | |
a1ab4c31 AC |
2690 | |
2691 | /* If this is a record extension, go a level further to find the | |
2692 | record definition. Also, verify we have a Parent_Subtype. */ | |
2693 | if (is_extension) | |
2694 | { | |
2695 | if (!type_annotate_only | |
2696 | || Present (Record_Extension_Part (record_definition))) | |
2697 | record_definition = Record_Extension_Part (record_definition); | |
2698 | ||
2699 | gcc_assert (type_annotate_only | |
2700 | || Present (Parent_Subtype (gnat_entity))); | |
2701 | } | |
2702 | ||
2703 | /* Make a node for the record. If we are not defining the record, | |
2704 | suppress expanding incomplete types. */ | |
2705 | gnu_type = make_node (tree_code_for_record_type (gnat_entity)); | |
0fb2335d | 2706 | TYPE_NAME (gnu_type) = gnu_entity_name; |
a1ab4c31 AC |
2707 | TYPE_PACKED (gnu_type) = (packed != 0) || has_rep; |
2708 | ||
2709 | if (!definition) | |
8cd28148 EB |
2710 | { |
2711 | defer_incomplete_level++; | |
2712 | this_deferred = true; | |
2713 | } | |
a1ab4c31 AC |
2714 | |
2715 | /* If both a size and rep clause was specified, put the size in | |
2716 | the record type now so that it can get the proper mode. */ | |
2717 | if (has_rep && Known_Esize (gnat_entity)) | |
2718 | TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype); | |
2719 | ||
2720 | /* Always set the alignment here so that it can be used to | |
2721 | set the mode, if it is making the alignment stricter. If | |
2722 | it is invalid, it will be checked again below. If this is to | |
2723 | be Atomic, choose a default alignment of a word unless we know | |
2724 | the size and it's smaller. */ | |
2725 | if (Known_Alignment (gnat_entity)) | |
2726 | TYPE_ALIGN (gnu_type) | |
2727 | = validate_alignment (Alignment (gnat_entity), gnat_entity, 0); | |
2728 | else if (Is_Atomic (gnat_entity)) | |
2729 | TYPE_ALIGN (gnu_type) | |
2730 | = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize); | |
2731 | /* If a type needs strict alignment, the minimum size will be the | |
2732 | type size instead of the RM size (see validate_size). Cap the | |
2733 | alignment, lest it causes this type size to become too large. */ | |
2734 | else if (Strict_Alignment (gnat_entity) | |
2735 | && Known_Static_Esize (gnat_entity)) | |
2736 | { | |
2737 | unsigned int raw_size = UI_To_Int (Esize (gnat_entity)); | |
2738 | unsigned int raw_align = raw_size & -raw_size; | |
2739 | if (raw_align < BIGGEST_ALIGNMENT) | |
2740 | TYPE_ALIGN (gnu_type) = raw_align; | |
2741 | } | |
2742 | else | |
2743 | TYPE_ALIGN (gnu_type) = 0; | |
2744 | ||
2745 | /* If we have a Parent_Subtype, make a field for the parent. If | |
2746 | this record has rep clauses, force the position to zero. */ | |
2747 | if (Present (Parent_Subtype (gnat_entity))) | |
2748 | { | |
2749 | Entity_Id gnat_parent = Parent_Subtype (gnat_entity); | |
2750 | tree gnu_parent; | |
2751 | ||
2752 | /* A major complexity here is that the parent subtype will | |
2753 | reference our discriminants in its Discriminant_Constraint | |
2754 | list. But those must reference the parent component of this | |
2755 | record which is of the parent subtype we have not built yet! | |
2756 | To break the circle we first build a dummy COMPONENT_REF which | |
2757 | represents the "get to the parent" operation and initialize | |
2758 | each of those discriminants to a COMPONENT_REF of the above | |
2759 | dummy parent referencing the corresponding discriminant of the | |
2760 | base type of the parent subtype. */ | |
2761 | gnu_get_parent = build3 (COMPONENT_REF, void_type_node, | |
2762 | build0 (PLACEHOLDER_EXPR, gnu_type), | |
c172df28 AH |
2763 | build_decl (input_location, |
2764 | FIELD_DECL, NULL_TREE, | |
a1ab4c31 AC |
2765 | void_type_node), |
2766 | NULL_TREE); | |
2767 | ||
c244bf8f | 2768 | if (has_discr) |
a1ab4c31 AC |
2769 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
2770 | Present (gnat_field); | |
2771 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2772 | if (Present (Corresponding_Discriminant (gnat_field))) | |
e99c3ccc EB |
2773 | { |
2774 | tree gnu_field | |
2775 | = gnat_to_gnu_field_decl (Corresponding_Discriminant | |
2776 | (gnat_field)); | |
2777 | save_gnu_tree | |
2778 | (gnat_field, | |
2779 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
2780 | gnu_get_parent, gnu_field, NULL_TREE), | |
2781 | true); | |
2782 | } | |
a1ab4c31 | 2783 | |
77022fa8 EB |
2784 | /* Then we build the parent subtype. If it has discriminants but |
2785 | the type itself has unknown discriminants, this means that it | |
2786 | doesn't contain information about how the discriminants are | |
2787 | derived from those of the ancestor type, so it cannot be used | |
2788 | directly. Instead it is built by cloning the parent subtype | |
2789 | of the underlying record view of the type, for which the above | |
2790 | derivation of discriminants has been made explicit. */ | |
2791 | if (Has_Discriminants (gnat_parent) | |
2792 | && Has_Unknown_Discriminants (gnat_entity)) | |
2793 | { | |
2794 | Entity_Id gnat_uview = Underlying_Record_View (gnat_entity); | |
2795 | ||
2796 | /* If we are defining the type, the underlying record | |
2797 | view must already have been elaborated at this point. | |
2798 | Otherwise do it now as its parent subtype cannot be | |
2799 | technically elaborated on its own. */ | |
2800 | if (definition) | |
2801 | gcc_assert (present_gnu_tree (gnat_uview)); | |
2802 | else | |
2803 | gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0); | |
2804 | ||
2805 | gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview)); | |
2806 | ||
2807 | /* Substitute the "get to the parent" of the type for that | |
2808 | of its underlying record view in the cloned type. */ | |
2809 | for (gnat_field = First_Stored_Discriminant (gnat_uview); | |
2810 | Present (gnat_field); | |
2811 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2812 | if (Present (Corresponding_Discriminant (gnat_field))) | |
2813 | { | |
c6bd4220 | 2814 | tree gnu_field = gnat_to_gnu_field_decl (gnat_field); |
77022fa8 EB |
2815 | tree gnu_ref |
2816 | = build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
2817 | gnu_get_parent, gnu_field, NULL_TREE); | |
2818 | gnu_parent | |
2819 | = substitute_in_type (gnu_parent, gnu_field, gnu_ref); | |
2820 | } | |
2821 | } | |
2822 | else | |
2823 | gnu_parent = gnat_to_gnu_type (gnat_parent); | |
a1ab4c31 AC |
2824 | |
2825 | /* Finally we fix up both kinds of twisted COMPONENT_REF we have | |
2826 | initially built. The discriminants must reference the fields | |
2827 | of the parent subtype and not those of its base type for the | |
2828 | placeholder machinery to properly work. */ | |
c244bf8f | 2829 | if (has_discr) |
cdaa0e0b EB |
2830 | { |
2831 | /* The actual parent subtype is the full view. */ | |
2832 | if (IN (Ekind (gnat_parent), Private_Kind)) | |
a1ab4c31 | 2833 | { |
cdaa0e0b EB |
2834 | if (Present (Full_View (gnat_parent))) |
2835 | gnat_parent = Full_View (gnat_parent); | |
2836 | else | |
2837 | gnat_parent = Underlying_Full_View (gnat_parent); | |
a1ab4c31 AC |
2838 | } |
2839 | ||
cdaa0e0b EB |
2840 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
2841 | Present (gnat_field); | |
2842 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2843 | if (Present (Corresponding_Discriminant (gnat_field))) | |
2844 | { | |
2845 | Entity_Id field = Empty; | |
2846 | for (field = First_Stored_Discriminant (gnat_parent); | |
2847 | Present (field); | |
2848 | field = Next_Stored_Discriminant (field)) | |
2849 | if (same_discriminant_p (gnat_field, field)) | |
2850 | break; | |
2851 | gcc_assert (Present (field)); | |
2852 | TREE_OPERAND (get_gnu_tree (gnat_field), 1) | |
2853 | = gnat_to_gnu_field_decl (field); | |
2854 | } | |
2855 | } | |
2856 | ||
a1ab4c31 AC |
2857 | /* The "get to the parent" COMPONENT_REF must be given its |
2858 | proper type... */ | |
2859 | TREE_TYPE (gnu_get_parent) = gnu_parent; | |
2860 | ||
8cd28148 | 2861 | /* ...and reference the _Parent field of this record. */ |
a6a29d0c | 2862 | gnu_field |
76af763d | 2863 | = create_field_decl (parent_name_id, |
da01bfee | 2864 | gnu_parent, gnu_type, |
c244bf8f EB |
2865 | has_rep |
2866 | ? TYPE_SIZE (gnu_parent) : NULL_TREE, | |
2867 | has_rep | |
da01bfee EB |
2868 | ? bitsize_zero_node : NULL_TREE, |
2869 | 0, 1); | |
a6a29d0c EB |
2870 | DECL_INTERNAL_P (gnu_field) = 1; |
2871 | TREE_OPERAND (gnu_get_parent, 1) = gnu_field; | |
2872 | TYPE_FIELDS (gnu_type) = gnu_field; | |
a1ab4c31 AC |
2873 | } |
2874 | ||
2875 | /* Make the fields for the discriminants and put them into the record | |
2876 | unless it's an Unchecked_Union. */ | |
c244bf8f | 2877 | if (has_discr) |
a1ab4c31 AC |
2878 | for (gnat_field = First_Stored_Discriminant (gnat_entity); |
2879 | Present (gnat_field); | |
2880 | gnat_field = Next_Stored_Discriminant (gnat_field)) | |
2881 | { | |
8cd28148 EB |
2882 | /* If this is a record extension and this discriminant is the |
2883 | renaming of another discriminant, we've handled it above. */ | |
a1ab4c31 AC |
2884 | if (Present (Parent_Subtype (gnat_entity)) |
2885 | && Present (Corresponding_Discriminant (gnat_field))) | |
2886 | continue; | |
2887 | ||
2888 | gnu_field | |
839f2864 EB |
2889 | = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition, |
2890 | debug_info_p); | |
a1ab4c31 AC |
2891 | |
2892 | /* Make an expression using a PLACEHOLDER_EXPR from the | |
2893 | FIELD_DECL node just created and link that with the | |
8cd28148 | 2894 | corresponding GNAT defining identifier. */ |
a1ab4c31 AC |
2895 | save_gnu_tree (gnat_field, |
2896 | build3 (COMPONENT_REF, TREE_TYPE (gnu_field), | |
8cd28148 | 2897 | build0 (PLACEHOLDER_EXPR, gnu_type), |
a1ab4c31 AC |
2898 | gnu_field, NULL_TREE), |
2899 | true); | |
2900 | ||
8cd28148 | 2901 | if (!is_unchecked_union) |
a1ab4c31 | 2902 | { |
910ad8de | 2903 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 AC |
2904 | gnu_field_list = gnu_field; |
2905 | } | |
2906 | } | |
2907 | ||
8cd28148 | 2908 | /* Add the fields into the record type and finish it up. */ |
a1ab4c31 AC |
2909 | components_to_record (gnu_type, Component_List (record_definition), |
2910 | gnu_field_list, packed, definition, NULL, | |
032d1b71 EB |
2911 | false, all_rep, is_unchecked_union, |
2912 | debug_info_p, false); | |
a1ab4c31 | 2913 | |
cb3d597d | 2914 | /* If it is passed by reference, force BLKmode to ensure that objects |
86060344 | 2915 | of this type will always be put in memory. */ |
cb3d597d | 2916 | if (Is_By_Reference_Type (gnat_entity)) |
6f9f0ce3 | 2917 | SET_TYPE_MODE (gnu_type, BLKmode); |
a1ab4c31 | 2918 | |
c244bf8f EB |
2919 | /* We used to remove the associations of the discriminants and _Parent |
2920 | for validity checking but we may need them if there's a Freeze_Node | |
2921 | for a subtype used in this record. */ | |
2922 | TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity); | |
2923 | ||
a1ab4c31 AC |
2924 | /* Fill in locations of fields. */ |
2925 | annotate_rep (gnat_entity, gnu_type); | |
2926 | ||
8cd28148 EB |
2927 | /* If there are any entities in the chain corresponding to components |
2928 | that we did not elaborate, ensure we elaborate their types if they | |
2929 | are Itypes. */ | |
a1ab4c31 | 2930 | for (gnat_temp = First_Entity (gnat_entity); |
8cd28148 EB |
2931 | Present (gnat_temp); |
2932 | gnat_temp = Next_Entity (gnat_temp)) | |
a1ab4c31 AC |
2933 | if ((Ekind (gnat_temp) == E_Component |
2934 | || Ekind (gnat_temp) == E_Discriminant) | |
2935 | && Is_Itype (Etype (gnat_temp)) | |
2936 | && !present_gnu_tree (gnat_temp)) | |
2937 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); | |
871fda0a EB |
2938 | |
2939 | /* If this is a record type associated with an exception definition, | |
2940 | equate its fields to those of the standard exception type. This | |
2941 | will make it possible to convert between them. */ | |
2942 | if (gnu_entity_name == exception_data_name_id) | |
2943 | { | |
2944 | tree gnu_std_field; | |
2945 | for (gnu_field = TYPE_FIELDS (gnu_type), | |
2946 | gnu_std_field = TYPE_FIELDS (except_type_node); | |
2947 | gnu_field; | |
910ad8de NF |
2948 | gnu_field = DECL_CHAIN (gnu_field), |
2949 | gnu_std_field = DECL_CHAIN (gnu_std_field)) | |
871fda0a EB |
2950 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (gnu_field, gnu_std_field); |
2951 | gcc_assert (!gnu_std_field); | |
2952 | } | |
a1ab4c31 AC |
2953 | } |
2954 | break; | |
2955 | ||
2956 | case E_Class_Wide_Subtype: | |
2957 | /* If an equivalent type is present, that is what we should use. | |
2958 | Otherwise, fall through to handle this like a record subtype | |
2959 | since it may have constraints. */ | |
2960 | if (gnat_equiv_type != gnat_entity) | |
2961 | { | |
2962 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); | |
2963 | maybe_present = true; | |
2964 | break; | |
2965 | } | |
2966 | ||
2967 | /* ... fall through ... */ | |
2968 | ||
2969 | case E_Record_Subtype: | |
a1ab4c31 AC |
2970 | /* If Cloned_Subtype is Present it means this record subtype has |
2971 | identical layout to that type or subtype and we should use | |
2972 | that GCC type for this one. The front end guarantees that | |
2973 | the component list is shared. */ | |
2974 | if (Present (Cloned_Subtype (gnat_entity))) | |
2975 | { | |
2976 | gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity), | |
2977 | NULL_TREE, 0); | |
2978 | maybe_present = true; | |
8cd28148 | 2979 | break; |
a1ab4c31 AC |
2980 | } |
2981 | ||
2982 | /* Otherwise, first ensure the base type is elaborated. Then, if we are | |
8cd28148 EB |
2983 | changing the type, make a new type with each field having the type of |
2984 | the field in the new subtype but the position computed by transforming | |
2985 | every discriminant reference according to the constraints. We don't | |
2986 | see any difference between private and non-private type here since | |
2987 | derivations from types should have been deferred until the completion | |
2988 | of the private type. */ | |
a1ab4c31 AC |
2989 | else |
2990 | { | |
2991 | Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity); | |
c244bf8f | 2992 | tree gnu_base_type; |
a1ab4c31 AC |
2993 | |
2994 | if (!definition) | |
8cd28148 EB |
2995 | { |
2996 | defer_incomplete_level++; | |
2997 | this_deferred = true; | |
2998 | } | |
a1ab4c31 | 2999 | |
a1ab4c31 AC |
3000 | gnu_base_type = gnat_to_gnu_type (gnat_base_type); |
3001 | ||
a1ab4c31 AC |
3002 | if (present_gnu_tree (gnat_entity)) |
3003 | { | |
3004 | maybe_present = true; | |
3005 | break; | |
3006 | } | |
3007 | ||
901ad63f EB |
3008 | /* If this is a record subtype associated with a dispatch table, |
3009 | strip the suffix. This is necessary to make sure 2 different | |
3010 | subtypes associated with the imported and exported views of a | |
3011 | dispatch table are properly merged in LTO mode. */ | |
3012 | if (Is_Dispatch_Table_Entity (gnat_entity)) | |
3013 | { | |
3014 | char *p; | |
3015 | Get_Encoded_Name (gnat_entity); | |
c679a915 | 3016 | p = strchr (Name_Buffer, '_'); |
901ad63f | 3017 | gcc_assert (p); |
c679a915 | 3018 | strcpy (p+2, "dtS"); |
901ad63f EB |
3019 | gnu_entity_name = get_identifier (Name_Buffer); |
3020 | } | |
3021 | ||
8cd28148 | 3022 | /* When the subtype has discriminants and these discriminants affect |
95c1c4bb EB |
3023 | the initial shape it has inherited, factor them in. But for an |
3024 | Unchecked_Union (it must be an Itype), just return the type. | |
8cd28148 EB |
3025 | We can't just test Is_Constrained because private subtypes without |
3026 | discriminants of types with discriminants with default expressions | |
3027 | are Is_Constrained but aren't constrained! */ | |
a1ab4c31 | 3028 | if (IN (Ekind (gnat_base_type), Record_Kind) |
a1ab4c31 | 3029 | && !Is_Unchecked_Union (gnat_base_type) |
8cd28148 | 3030 | && !Is_For_Access_Subtype (gnat_entity) |
a1ab4c31 | 3031 | && Is_Constrained (gnat_entity) |
8cd28148 EB |
3032 | && Has_Discriminants (gnat_entity) |
3033 | && Present (Discriminant_Constraint (gnat_entity)) | |
3034 | && Stored_Constraint (gnat_entity) != No_Elist) | |
a1ab4c31 | 3035 | { |
a1ab4c31 | 3036 | tree gnu_subst_list |
8cd28148 | 3037 | = build_subst_list (gnat_entity, gnat_base_type, definition); |
95c1c4bb EB |
3038 | tree gnu_unpad_base_type, gnu_rep_part, gnu_variant_part, t; |
3039 | tree gnu_variant_list, gnu_pos_list, gnu_field_list = NULL_TREE; | |
3040 | bool selected_variant = false; | |
8cd28148 | 3041 | Entity_Id gnat_field; |
a1ab4c31 AC |
3042 | |
3043 | gnu_type = make_node (RECORD_TYPE); | |
0fb2335d | 3044 | TYPE_NAME (gnu_type) = gnu_entity_name; |
a1ab4c31 AC |
3045 | |
3046 | /* Set the size, alignment and alias set of the new type to | |
95c1c4bb EB |
3047 | match that of the old one, doing required substitutions. */ |
3048 | copy_and_substitute_in_size (gnu_type, gnu_base_type, | |
3049 | gnu_subst_list); | |
c244bf8f | 3050 | |
315cff15 | 3051 | if (TYPE_IS_PADDING_P (gnu_base_type)) |
c244bf8f EB |
3052 | gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type)); |
3053 | else | |
3054 | gnu_unpad_base_type = gnu_base_type; | |
3055 | ||
95c1c4bb EB |
3056 | /* Look for a REP part in the base type. */ |
3057 | gnu_rep_part = get_rep_part (gnu_unpad_base_type); | |
3058 | ||
3059 | /* Look for a variant part in the base type. */ | |
3060 | gnu_variant_part = get_variant_part (gnu_unpad_base_type); | |
3061 | ||
3062 | /* If there is a variant part, we must compute whether the | |
3063 | constraints statically select a particular variant. If | |
3064 | so, we simply drop the qualified union and flatten the | |
3065 | list of fields. Otherwise we'll build a new qualified | |
3066 | union for the variants that are still relevant. */ | |
3067 | if (gnu_variant_part) | |
3068 | { | |
3069 | gnu_variant_list | |
3070 | = build_variant_list (TREE_TYPE (gnu_variant_part), | |
3071 | gnu_subst_list, NULL_TREE); | |
3072 | ||
3073 | /* If all the qualifiers are unconditionally true, the | |
3074 | innermost variant is statically selected. */ | |
3075 | selected_variant = true; | |
3076 | for (t = gnu_variant_list; t; t = TREE_CHAIN (t)) | |
3077 | if (!integer_onep (TREE_VEC_ELT (TREE_VALUE (t), 1))) | |
3078 | { | |
3079 | selected_variant = false; | |
3080 | break; | |
3081 | } | |
3082 | ||
3083 | /* Otherwise, create the new variants. */ | |
3084 | if (!selected_variant) | |
3085 | for (t = gnu_variant_list; t; t = TREE_CHAIN (t)) | |
3086 | { | |
3087 | tree old_variant = TREE_PURPOSE (t); | |
3088 | tree new_variant = make_node (RECORD_TYPE); | |
3089 | TYPE_NAME (new_variant) | |
3090 | = DECL_NAME (TYPE_NAME (old_variant)); | |
3091 | copy_and_substitute_in_size (new_variant, old_variant, | |
3092 | gnu_subst_list); | |
3093 | TREE_VEC_ELT (TREE_VALUE (t), 2) = new_variant; | |
3094 | } | |
3095 | } | |
3096 | else | |
3097 | { | |
3098 | gnu_variant_list = NULL_TREE; | |
3099 | selected_variant = false; | |
3100 | } | |
3101 | ||
c244bf8f | 3102 | gnu_pos_list |
95c1c4bb EB |
3103 | = build_position_list (gnu_unpad_base_type, |
3104 | gnu_variant_list && !selected_variant, | |
3105 | size_zero_node, bitsize_zero_node, | |
3106 | BIGGEST_ALIGNMENT, NULL_TREE); | |
a1ab4c31 AC |
3107 | |
3108 | for (gnat_field = First_Entity (gnat_entity); | |
c244bf8f EB |
3109 | Present (gnat_field); |
3110 | gnat_field = Next_Entity (gnat_field)) | |
a1ab4c31 AC |
3111 | if ((Ekind (gnat_field) == E_Component |
3112 | || Ekind (gnat_field) == E_Discriminant) | |
c244bf8f EB |
3113 | && !(Present (Corresponding_Discriminant (gnat_field)) |
3114 | && Is_Tagged_Type (gnat_base_type)) | |
8cd28148 EB |
3115 | && Underlying_Type (Scope (Original_Record_Component |
3116 | (gnat_field))) | |
c244bf8f | 3117 | == gnat_base_type) |
a1ab4c31 | 3118 | { |
a6a29d0c | 3119 | Name_Id gnat_name = Chars (gnat_field); |
c244bf8f EB |
3120 | Entity_Id gnat_old_field |
3121 | = Original_Record_Component (gnat_field); | |
a1ab4c31 | 3122 | tree gnu_old_field |
c244bf8f | 3123 | = gnat_to_gnu_field_decl (gnat_old_field); |
95c1c4bb EB |
3124 | tree gnu_context = DECL_CONTEXT (gnu_old_field); |
3125 | tree gnu_field, gnu_field_type, gnu_size; | |
3126 | tree gnu_cont_type, gnu_last = NULL_TREE; | |
3f6f0eb2 EB |
3127 | |
3128 | /* If the type is the same, retrieve the GCC type from the | |
3129 | old field to take into account possible adjustments. */ | |
c244bf8f | 3130 | if (Etype (gnat_field) == Etype (gnat_old_field)) |
3f6f0eb2 EB |
3131 | gnu_field_type = TREE_TYPE (gnu_old_field); |
3132 | else | |
3133 | gnu_field_type = gnat_to_gnu_type (Etype (gnat_field)); | |
3134 | ||
a1ab4c31 AC |
3135 | /* If there was a component clause, the field types must be |
3136 | the same for the type and subtype, so copy the data from | |
3137 | the old field to avoid recomputation here. Also if the | |
3138 | field is justified modular and the optimization in | |
3139 | gnat_to_gnu_field was applied. */ | |
c244bf8f | 3140 | if (Present (Component_Clause (gnat_old_field)) |
a1ab4c31 AC |
3141 | || (TREE_CODE (gnu_field_type) == RECORD_TYPE |
3142 | && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) | |
3143 | && TREE_TYPE (TYPE_FIELDS (gnu_field_type)) | |
3144 | == TREE_TYPE (gnu_old_field))) | |
3145 | { | |
3146 | gnu_size = DECL_SIZE (gnu_old_field); | |
3147 | gnu_field_type = TREE_TYPE (gnu_old_field); | |
3148 | } | |
3149 | ||
3150 | /* If the old field was packed and of constant size, we | |
3151 | have to get the old size here, as it might differ from | |
3152 | what the Etype conveys and the latter might overlap | |
3153 | onto the following field. Try to arrange the type for | |
3154 | possible better packing along the way. */ | |
3155 | else if (DECL_PACKED (gnu_old_field) | |
3156 | && TREE_CODE (DECL_SIZE (gnu_old_field)) | |
3157 | == INTEGER_CST) | |
3158 | { | |
3159 | gnu_size = DECL_SIZE (gnu_old_field); | |
39ae51e0 | 3160 | if (TREE_CODE (gnu_field_type) == RECORD_TYPE |
315cff15 | 3161 | && !TYPE_FAT_POINTER_P (gnu_field_type) |
a1ab4c31 AC |
3162 | && host_integerp (TYPE_SIZE (gnu_field_type), 1)) |
3163 | gnu_field_type | |
3164 | = make_packable_type (gnu_field_type, true); | |
3165 | } | |
3166 | ||
c244bf8f EB |
3167 | else |
3168 | gnu_size = TYPE_SIZE (gnu_field_type); | |
3169 | ||
95c1c4bb EB |
3170 | /* If the context of the old field is the base type or its |
3171 | REP part (if any), put the field directly in the new | |
3172 | type; otherwise look up the context in the variant list | |
3173 | and put the field either in the new type if there is a | |
3174 | selected variant or in one of the new variants. */ | |
3175 | if (gnu_context == gnu_unpad_base_type | |
3176 | || (gnu_rep_part | |
3177 | && gnu_context == TREE_TYPE (gnu_rep_part))) | |
3178 | gnu_cont_type = gnu_type; | |
3179 | else | |
a1ab4c31 | 3180 | { |
95c1c4bb EB |
3181 | t = purpose_member (gnu_context, gnu_variant_list); |
3182 | if (t) | |
3183 | { | |
3184 | if (selected_variant) | |
3185 | gnu_cont_type = gnu_type; | |
3186 | else | |
3187 | gnu_cont_type = TREE_VEC_ELT (TREE_VALUE (t), 2); | |
3188 | } | |
3189 | else | |
3190 | /* The front-end may pass us "ghost" components if | |
3191 | it fails to recognize that a constrained subtype | |
3192 | is statically constrained. Discard them. */ | |
a1ab4c31 AC |
3193 | continue; |
3194 | } | |
3195 | ||
95c1c4bb | 3196 | /* Now create the new field modeled on the old one. */ |
a1ab4c31 | 3197 | gnu_field |
95c1c4bb EB |
3198 | = create_field_decl_from (gnu_old_field, gnu_field_type, |
3199 | gnu_cont_type, gnu_size, | |
3200 | gnu_pos_list, gnu_subst_list); | |
a1ab4c31 | 3201 | |
95c1c4bb EB |
3202 | /* Put it in one of the new variants directly. */ |
3203 | if (gnu_cont_type != gnu_type) | |
a1ab4c31 | 3204 | { |
910ad8de | 3205 | DECL_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type); |
95c1c4bb | 3206 | TYPE_FIELDS (gnu_cont_type) = gnu_field; |
a1ab4c31 AC |
3207 | } |
3208 | ||
a6a29d0c EB |
3209 | /* To match the layout crafted in components_to_record, |
3210 | if this is the _Tag or _Parent field, put it before | |
3211 | any other fields. */ | |
95c1c4bb EB |
3212 | else if (gnat_name == Name_uTag |
3213 | || gnat_name == Name_uParent) | |
13318d2f | 3214 | gnu_field_list = chainon (gnu_field_list, gnu_field); |
a6a29d0c EB |
3215 | |
3216 | /* Similarly, if this is the _Controller field, put | |
3217 | it before the other fields except for the _Tag or | |
3218 | _Parent field. */ | |
3219 | else if (gnat_name == Name_uController && gnu_last) | |
3220 | { | |
3221 | TREE_CHAIN (gnu_field) = TREE_CHAIN (gnu_last); | |
3222 | TREE_CHAIN (gnu_last) = gnu_field; | |
3223 | } | |
3224 | ||
3225 | /* Otherwise, if this is a regular field, put it after | |
3226 | the other fields. */ | |
13318d2f EB |
3227 | else |
3228 | { | |
910ad8de | 3229 | DECL_CHAIN (gnu_field) = gnu_field_list; |
13318d2f | 3230 | gnu_field_list = gnu_field; |
a6a29d0c EB |
3231 | if (!gnu_last) |
3232 | gnu_last = gnu_field; | |
13318d2f EB |
3233 | } |
3234 | ||
a1ab4c31 AC |
3235 | save_gnu_tree (gnat_field, gnu_field, false); |
3236 | } | |
3237 | ||
95c1c4bb EB |
3238 | /* If there is a variant list and no selected variant, we need |
3239 | to create the nest of variant parts from the old nest. */ | |
3240 | if (gnu_variant_list && !selected_variant) | |
3241 | { | |
3242 | tree new_variant_part | |
3243 | = create_variant_part_from (gnu_variant_part, | |
3244 | gnu_variant_list, gnu_type, | |
3245 | gnu_pos_list, gnu_subst_list); | |
910ad8de | 3246 | DECL_CHAIN (new_variant_part) = gnu_field_list; |
95c1c4bb EB |
3247 | gnu_field_list = new_variant_part; |
3248 | } | |
3249 | ||
a1ab4c31 AC |
3250 | /* Now go through the entities again looking for Itypes that |
3251 | we have not elaborated but should (e.g., Etypes of fields | |
3252 | that have Original_Components). */ | |
3253 | for (gnat_field = First_Entity (gnat_entity); | |
3254 | Present (gnat_field); gnat_field = Next_Entity (gnat_field)) | |
3255 | if ((Ekind (gnat_field) == E_Discriminant | |
3256 | || Ekind (gnat_field) == E_Component) | |
3257 | && !present_gnu_tree (Etype (gnat_field))) | |
3258 | gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0); | |
3259 | ||
032d1b71 EB |
3260 | /* Do not emit debug info for the type yet since we're going to |
3261 | modify it below. */ | |
a1ab4c31 | 3262 | gnu_field_list = nreverse (gnu_field_list); |
032d1b71 | 3263 | finish_record_type (gnu_type, gnu_field_list, 2, false); |
a1ab4c31 | 3264 | |
c244bf8f | 3265 | /* See the E_Record_Type case for the rationale. */ |
cb3d597d | 3266 | if (Is_By_Reference_Type (gnat_entity)) |
c244bf8f EB |
3267 | SET_TYPE_MODE (gnu_type, BLKmode); |
3268 | else | |
3269 | compute_record_mode (gnu_type); | |
3270 | ||
3271 | TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity); | |
a1ab4c31 AC |
3272 | |
3273 | /* Fill in locations of fields. */ | |
3274 | annotate_rep (gnat_entity, gnu_type); | |
3275 | ||
e9cfc9b5 EB |
3276 | /* If debugging information is being written for the type, write |
3277 | a record that shows what we are a subtype of and also make a | |
3278 | variable that indicates our size, if still variable. */ | |
a1ab4c31 AC |
3279 | if (debug_info_p) |
3280 | { | |
3281 | tree gnu_subtype_marker = make_node (RECORD_TYPE); | |
c244bf8f | 3282 | tree gnu_unpad_base_name = TYPE_NAME (gnu_unpad_base_type); |
e9cfc9b5 | 3283 | tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type); |
a1ab4c31 | 3284 | |
c244bf8f EB |
3285 | if (TREE_CODE (gnu_unpad_base_name) == TYPE_DECL) |
3286 | gnu_unpad_base_name = DECL_NAME (gnu_unpad_base_name); | |
a1ab4c31 AC |
3287 | |
3288 | TYPE_NAME (gnu_subtype_marker) | |
3289 | = create_concat_name (gnat_entity, "XVS"); | |
3290 | finish_record_type (gnu_subtype_marker, | |
c244bf8f EB |
3291 | create_field_decl (gnu_unpad_base_name, |
3292 | build_reference_type | |
3293 | (gnu_unpad_base_type), | |
a1ab4c31 | 3294 | gnu_subtype_marker, |
da01bfee EB |
3295 | NULL_TREE, NULL_TREE, |
3296 | 0, 0), | |
032d1b71 | 3297 | 0, true); |
a1ab4c31 AC |
3298 | |
3299 | add_parallel_type (TYPE_STUB_DECL (gnu_type), | |
3300 | gnu_subtype_marker); | |
e9cfc9b5 EB |
3301 | |
3302 | if (definition | |
3303 | && TREE_CODE (gnu_size_unit) != INTEGER_CST | |
3304 | && !CONTAINS_PLACEHOLDER_P (gnu_size_unit)) | |
b5bba4a6 EB |
3305 | TYPE_SIZE_UNIT (gnu_subtype_marker) |
3306 | = create_var_decl (create_concat_name (gnat_entity, | |
3307 | "XVZ"), | |
3308 | NULL_TREE, sizetype, gnu_size_unit, | |
3309 | false, false, false, false, NULL, | |
3310 | gnat_entity); | |
a1ab4c31 AC |
3311 | } |
3312 | ||
3313 | /* Now we can finalize it. */ | |
3314 | rest_of_record_type_compilation (gnu_type); | |
3315 | } | |
3316 | ||
8cd28148 EB |
3317 | /* Otherwise, go down all the components in the new type and make |
3318 | them equivalent to those in the base type. */ | |
a1ab4c31 | 3319 | else |
8cd28148 | 3320 | { |
c244bf8f | 3321 | gnu_type = gnu_base_type; |
8cd28148 EB |
3322 | |
3323 | for (gnat_temp = First_Entity (gnat_entity); | |
3324 | Present (gnat_temp); | |
3325 | gnat_temp = Next_Entity (gnat_temp)) | |
3326 | if ((Ekind (gnat_temp) == E_Discriminant | |
3327 | && !Is_Unchecked_Union (gnat_base_type)) | |
3328 | || Ekind (gnat_temp) == E_Component) | |
3329 | save_gnu_tree (gnat_temp, | |
3330 | gnat_to_gnu_field_decl | |
3331 | (Original_Record_Component (gnat_temp)), | |
3332 | false); | |
3333 | } | |
a1ab4c31 AC |
3334 | } |
3335 | break; | |
3336 | ||
3337 | case E_Access_Subprogram_Type: | |
3338 | /* Use the special descriptor type for dispatch tables if needed, | |
3339 | that is to say for the Prim_Ptr of a-tags.ads and its clones. | |
3340 | Note that we are only required to do so for static tables in | |
3341 | order to be compatible with the C++ ABI, but Ada 2005 allows | |
3342 | to extend library level tagged types at the local level so | |
3343 | we do it in the non-static case as well. */ | |
3344 | if (TARGET_VTABLE_USES_DESCRIPTORS | |
3345 | && Is_Dispatch_Table_Entity (gnat_entity)) | |
3346 | { | |
3347 | gnu_type = fdesc_type_node; | |
3348 | gnu_size = TYPE_SIZE (gnu_type); | |
3349 | break; | |
3350 | } | |
3351 | ||
3352 | /* ... fall through ... */ | |
3353 | ||
3354 | case E_Anonymous_Access_Subprogram_Type: | |
3355 | /* If we are not defining this entity, and we have incomplete | |
3356 | entities being processed above us, make a dummy type and | |
3357 | fill it in later. */ | |
3358 | if (!definition && defer_incomplete_level != 0) | |
3359 | { | |
3360 | struct incomplete *p | |
3361 | = (struct incomplete *) xmalloc (sizeof (struct incomplete)); | |
3362 | ||
3363 | gnu_type | |
3364 | = build_pointer_type | |
3365 | (make_dummy_type (Directly_Designated_Type (gnat_entity))); | |
0fb2335d | 3366 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
a1ab4c31 AC |
3367 | !Comes_From_Source (gnat_entity), |
3368 | debug_info_p, gnat_entity); | |
3369 | this_made_decl = true; | |
3370 | gnu_type = TREE_TYPE (gnu_decl); | |
3371 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
3372 | saved = true; | |
3373 | ||
3374 | p->old_type = TREE_TYPE (gnu_type); | |
3375 | p->full_type = Directly_Designated_Type (gnat_entity); | |
3376 | p->next = defer_incomplete_list; | |
3377 | defer_incomplete_list = p; | |
3378 | break; | |
3379 | } | |
3380 | ||
3381 | /* ... fall through ... */ | |
3382 | ||
3383 | case E_Allocator_Type: | |
3384 | case E_Access_Type: | |
3385 | case E_Access_Attribute_Type: | |
3386 | case E_Anonymous_Access_Type: | |
3387 | case E_General_Access_Type: | |
3388 | { | |
d0c26312 | 3389 | /* The designated type and its equivalent type for gigi. */ |
a1ab4c31 AC |
3390 | Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity); |
3391 | Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type); | |
d0c26312 | 3392 | /* Whether it comes from a limited with. */ |
a1ab4c31 AC |
3393 | bool is_from_limited_with |
3394 | = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind) | |
3395 | && From_With_Type (gnat_desig_equiv)); | |
d0c26312 | 3396 | /* The "full view" of the designated type. If this is an incomplete |
a1ab4c31 AC |
3397 | entity from a limited with, treat its non-limited view as the full |
3398 | view. Otherwise, if this is an incomplete or private type, use the | |
3399 | full view. In the former case, we might point to a private type, | |
3400 | in which case, we need its full view. Also, we want to look at the | |
3401 | actual type used for the representation, so this takes a total of | |
3402 | three steps. */ | |
3403 | Entity_Id gnat_desig_full_direct_first | |
d0c26312 EB |
3404 | = (is_from_limited_with |
3405 | ? Non_Limited_View (gnat_desig_equiv) | |
a1ab4c31 AC |
3406 | : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind) |
3407 | ? Full_View (gnat_desig_equiv) : Empty)); | |
3408 | Entity_Id gnat_desig_full_direct | |
3409 | = ((is_from_limited_with | |
3410 | && Present (gnat_desig_full_direct_first) | |
3411 | && IN (Ekind (gnat_desig_full_direct_first), Private_Kind)) | |
3412 | ? Full_View (gnat_desig_full_direct_first) | |
3413 | : gnat_desig_full_direct_first); | |
3414 | Entity_Id gnat_desig_full | |
3415 | = Gigi_Equivalent_Type (gnat_desig_full_direct); | |
d0c26312 EB |
3416 | /* The type actually used to represent the designated type, either |
3417 | gnat_desig_full or gnat_desig_equiv. */ | |
a1ab4c31 | 3418 | Entity_Id gnat_desig_rep; |
1e17ef87 | 3419 | /* True if this is a pointer to an unconstrained array. */ |
a1ab4c31 | 3420 | bool is_unconstrained_array; |
a1ab4c31 AC |
3421 | /* We want to know if we'll be seeing the freeze node for any |
3422 | incomplete type we may be pointing to. */ | |
3423 | bool in_main_unit | |
3424 | = (Present (gnat_desig_full) | |
3425 | ? In_Extended_Main_Code_Unit (gnat_desig_full) | |
3426 | : In_Extended_Main_Code_Unit (gnat_desig_type)); | |
1e17ef87 | 3427 | /* True if we make a dummy type here. */ |
a1ab4c31 | 3428 | bool made_dummy = false; |
d0c26312 EB |
3429 | /* True if the dummy type is a fat pointer. */ |
3430 | bool got_fat_p = false; | |
3431 | /* The mode to be used for the pointer type. */ | |
a1ab4c31 | 3432 | enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0); |
d0c26312 EB |
3433 | /* The GCC type used for the designated type. */ |
3434 | tree gnu_desig_type = NULL_TREE; | |
a1ab4c31 AC |
3435 | |
3436 | if (!targetm.valid_pointer_mode (p_mode)) | |
3437 | p_mode = ptr_mode; | |
3438 | ||
3439 | /* If either the designated type or its full view is an unconstrained | |
3440 | array subtype, replace it with the type it's a subtype of. This | |
3441 | avoids problems with multiple copies of unconstrained array types. | |
3442 | Likewise, if the designated type is a subtype of an incomplete | |
3443 | record type, use the parent type to avoid order of elaboration | |
3444 | issues. This can lose some code efficiency, but there is no | |
3445 | alternative. */ | |
3446 | if (Ekind (gnat_desig_equiv) == E_Array_Subtype | |
d0c26312 | 3447 | && !Is_Constrained (gnat_desig_equiv)) |
a1ab4c31 AC |
3448 | gnat_desig_equiv = Etype (gnat_desig_equiv); |
3449 | if (Present (gnat_desig_full) | |
3450 | && ((Ekind (gnat_desig_full) == E_Array_Subtype | |
d0c26312 | 3451 | && !Is_Constrained (gnat_desig_full)) |
a1ab4c31 AC |
3452 | || (Ekind (gnat_desig_full) == E_Record_Subtype |
3453 | && Ekind (Etype (gnat_desig_full)) == E_Record_Type))) | |
3454 | gnat_desig_full = Etype (gnat_desig_full); | |
3455 | ||
d0c26312 EB |
3456 | /* Set the type that's actually the representation of the designated |
3457 | type and also flag whether we have a unconstrained array. */ | |
3458 | gnat_desig_rep | |
3459 | = Present (gnat_desig_full) ? gnat_desig_full : gnat_desig_equiv; | |
a1ab4c31 | 3460 | is_unconstrained_array |
d0c26312 | 3461 | = Is_Array_Type (gnat_desig_rep) && !Is_Constrained (gnat_desig_rep); |
a1ab4c31 AC |
3462 | |
3463 | /* If we are pointing to an incomplete type whose completion is an | |
3464 | unconstrained array, make a fat pointer type. The two types in our | |
3465 | fields will be pointers to dummy nodes and will be replaced in | |
3466 | update_pointer_to. Similarly, if the type itself is a dummy type or | |
3467 | an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE | |
3468 | in case we have any thin pointers to it. */ | |
3469 | if (is_unconstrained_array | |
3470 | && (Present (gnat_desig_full) | |
3471 | || (present_gnu_tree (gnat_desig_equiv) | |
d0c26312 EB |
3472 | && TYPE_IS_DUMMY_P |
3473 | (TREE_TYPE (get_gnu_tree (gnat_desig_equiv)))) | |
3474 | || (!in_main_unit | |
3475 | && defer_incomplete_level | |
3476 | && !present_gnu_tree (gnat_desig_equiv)) | |
3477 | || (in_main_unit | |
3478 | && is_from_limited_with | |
3479 | && Present (Freeze_Node (gnat_desig_equiv))))) | |
a8e05f92 | 3480 | { |
a8e05f92 | 3481 | if (present_gnu_tree (gnat_desig_rep)) |
d0c26312 | 3482 | gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_rep)); |
a8e05f92 EB |
3483 | else |
3484 | { | |
d0c26312 | 3485 | gnu_desig_type = make_dummy_type (gnat_desig_rep); |
a8e05f92 EB |
3486 | /* Show the dummy we get will be a fat pointer. */ |
3487 | got_fat_p = made_dummy = true; | |
3488 | } | |
a1ab4c31 | 3489 | |
d0c26312 EB |
3490 | /* If the call above got something that has a pointer, the pointer |
3491 | is our type. This could have happened either because the type | |
3492 | was elaborated or because somebody else executed the code. */ | |
3493 | gnu_type = TYPE_POINTER_TO (gnu_desig_type); | |
a1ab4c31 AC |
3494 | if (!gnu_type) |
3495 | { | |
3496 | tree gnu_template_type = make_node (ENUMERAL_TYPE); | |
3497 | tree gnu_ptr_template = build_pointer_type (gnu_template_type); | |
3498 | tree gnu_array_type = make_node (ENUMERAL_TYPE); | |
3499 | tree gnu_ptr_array = build_pointer_type (gnu_array_type); | |
a8e05f92 | 3500 | tree fields; |
a1ab4c31 AC |
3501 | |
3502 | TYPE_NAME (gnu_template_type) | |
0fb2335d | 3503 | = create_concat_name (gnat_desig_equiv, "XUB"); |
a1ab4c31 AC |
3504 | TYPE_DUMMY_P (gnu_template_type) = 1; |
3505 | ||
3506 | TYPE_NAME (gnu_array_type) | |
0fb2335d | 3507 | = create_concat_name (gnat_desig_equiv, "XUA"); |
a1ab4c31 AC |
3508 | TYPE_DUMMY_P (gnu_array_type) = 1; |
3509 | ||
3510 | gnu_type = make_node (RECORD_TYPE); | |
d0c26312 EB |
3511 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_desig_type); |
3512 | TYPE_POINTER_TO (gnu_desig_type) = gnu_type; | |
a1ab4c31 | 3513 | |
a1ab4c31 | 3514 | fields |
d0c26312 | 3515 | = create_field_decl (get_identifier ("P_ARRAY"), |
da01bfee | 3516 | gnu_ptr_array, gnu_type, |
d0c26312 | 3517 | NULL_TREE, NULL_TREE, 0, 0); |
910ad8de | 3518 | DECL_CHAIN (fields) |
d0c26312 EB |
3519 | = create_field_decl (get_identifier ("P_BOUNDS"), |
3520 | gnu_ptr_template, gnu_type, | |
3521 | NULL_TREE, NULL_TREE, 0, 0); | |
a1ab4c31 AC |
3522 | |
3523 | /* Make sure we can place this into a register. */ | |
3524 | TYPE_ALIGN (gnu_type) | |
3525 | = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE); | |
315cff15 | 3526 | TYPE_FAT_POINTER_P (gnu_type) = 1; |
a1ab4c31 | 3527 | |
032d1b71 EB |
3528 | /* Do not emit debug info for this record type since the types |
3529 | of its fields are incomplete. */ | |
3530 | finish_record_type (gnu_type, fields, 0, false); | |
a1ab4c31 | 3531 | |
d0c26312 EB |
3532 | TYPE_OBJECT_RECORD_TYPE (gnu_desig_type) |
3533 | = make_node (RECORD_TYPE); | |
3534 | TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_desig_type)) | |
0fb2335d | 3535 | = create_concat_name (gnat_desig_equiv, "XUT"); |
d0c26312 | 3536 | TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_desig_type)) = 1; |
a1ab4c31 AC |
3537 | } |
3538 | } | |
3539 | ||
3540 | /* If we already know what the full type is, use it. */ | |
3541 | else if (Present (gnat_desig_full) | |
3542 | && present_gnu_tree (gnat_desig_full)) | |
3543 | gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full)); | |
3544 | ||
d0c26312 EB |
3545 | /* Get the type of the thing we are to point to and build a pointer to |
3546 | it. If it is a reference to an incomplete or private type with a | |
a1ab4c31 AC |
3547 | full view that is a record, make a dummy type node and get the |
3548 | actual type later when we have verified it is safe. */ | |
d0c26312 EB |
3549 | else if ((!in_main_unit |
3550 | && !present_gnu_tree (gnat_desig_equiv) | |
a1ab4c31 | 3551 | && Present (gnat_desig_full) |
d0c26312 | 3552 | && !present_gnu_tree (gnat_desig_full) |
a1ab4c31 | 3553 | && Is_Record_Type (gnat_desig_full)) |
d0c26312 EB |
3554 | /* Likewise if we are pointing to a record or array and we are |
3555 | to defer elaborating incomplete types. We do this as this | |
3556 | access type may be the full view of a private type. Note | |
3557 | that the unconstrained array case is handled above. */ | |
3558 | || ((!in_main_unit || imported_p) | |
3559 | && defer_incomplete_level | |
3560 | && !present_gnu_tree (gnat_desig_equiv) | |
3561 | && (Is_Record_Type (gnat_desig_rep) | |
3562 | || Is_Array_Type (gnat_desig_rep))) | |
a1ab4c31 | 3563 | /* If this is a reference from a limited_with type back to our |
d0c26312 | 3564 | main unit and there's a freeze node for it, either we have |
a1ab4c31 AC |
3565 | already processed the declaration and made the dummy type, |
3566 | in which case we just reuse the latter, or we have not yet, | |
3567 | in which case we make the dummy type and it will be reused | |
d0c26312 EB |
3568 | when the declaration is finally processed. In both cases, |
3569 | the pointer eventually created below will be automatically | |
3570 | adjusted when the freeze node is processed. Note that the | |
2ddc34ba | 3571 | unconstrained array case is handled above. */ |
d0c26312 EB |
3572 | || (in_main_unit |
3573 | && is_from_limited_with | |
a1ab4c31 AC |
3574 | && Present (Freeze_Node (gnat_desig_rep)))) |
3575 | { | |
3576 | gnu_desig_type = make_dummy_type (gnat_desig_equiv); | |
3577 | made_dummy = true; | |
3578 | } | |
3579 | ||
3580 | /* Otherwise handle the case of a pointer to itself. */ | |
3581 | else if (gnat_desig_equiv == gnat_entity) | |
3582 | { | |
3583 | gnu_type | |
3584 | = build_pointer_type_for_mode (void_type_node, p_mode, | |
3585 | No_Strict_Aliasing (gnat_entity)); | |
3586 | TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type; | |
3587 | } | |
3588 | ||
d0c26312 EB |
3589 | /* If expansion is disabled, the equivalent type of a concurrent type |
3590 | is absent, so build a dummy pointer type. */ | |
a1ab4c31 AC |
3591 | else if (type_annotate_only && No (gnat_desig_equiv)) |
3592 | gnu_type = ptr_void_type_node; | |
3593 | ||
d0c26312 EB |
3594 | /* Finally, handle the default case where we can just elaborate our |
3595 | designated type. */ | |
a1ab4c31 AC |
3596 | else |
3597 | gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv); | |
3598 | ||
3599 | /* It is possible that a call to gnat_to_gnu_type above resolved our | |
3600 | type. If so, just return it. */ | |
3601 | if (present_gnu_tree (gnat_entity)) | |
3602 | { | |
3603 | maybe_present = true; | |
3604 | break; | |
3605 | } | |
3606 | ||
d0c26312 EB |
3607 | /* If we have not done it yet, build the pointer type the usual way. */ |
3608 | if (!gnu_type) | |
a1ab4c31 | 3609 | { |
d0c26312 EB |
3610 | /* Modify the designated type if we are pointing only to constant |
3611 | objects, but don't do it for unconstrained arrays. */ | |
a1ab4c31 AC |
3612 | if (Is_Access_Constant (gnat_entity) |
3613 | && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE) | |
3614 | { | |
3615 | gnu_desig_type | |
3616 | = build_qualified_type | |
3617 | (gnu_desig_type, | |
3618 | TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST); | |
3619 | ||
3620 | /* Some extra processing is required if we are building a | |
2ddc34ba | 3621 | pointer to an incomplete type (in the GCC sense). We might |
a1ab4c31 AC |
3622 | have such a type if we just made a dummy, or directly out |
3623 | of the call to gnat_to_gnu_type above if we are processing | |
3624 | an access type for a record component designating the | |
3625 | record type itself. */ | |
3626 | if (TYPE_MODE (gnu_desig_type) == VOIDmode) | |
3627 | { | |
3628 | /* We must ensure that the pointer to variant we make will | |
3629 | be processed by update_pointer_to when the initial type | |
2ddc34ba | 3630 | is completed. Pretend we made a dummy and let further |
a1ab4c31 AC |
3631 | processing act as usual. */ |
3632 | made_dummy = true; | |
3633 | ||
3634 | /* We must ensure that update_pointer_to will not retrieve | |
3635 | the dummy variant when building a properly qualified | |
2ddc34ba | 3636 | version of the complete type. We take advantage of the |
a1ab4c31 AC |
3637 | fact that get_qualified_type is requiring TYPE_NAMEs to |
3638 | match to influence build_qualified_type and then also | |
2ddc34ba | 3639 | update_pointer_to here. */ |
a1ab4c31 AC |
3640 | TYPE_NAME (gnu_desig_type) |
3641 | = create_concat_name (gnat_desig_type, "INCOMPLETE_CST"); | |
3642 | } | |
3643 | } | |
3644 | ||
3645 | gnu_type | |
3646 | = build_pointer_type_for_mode (gnu_desig_type, p_mode, | |
3647 | No_Strict_Aliasing (gnat_entity)); | |
3648 | } | |
3649 | ||
d0c26312 | 3650 | /* If we are not defining this object and we have made a dummy pointer, |
a1ab4c31 AC |
3651 | save our current definition, evaluate the actual type, and replace |
3652 | the tentative type we made with the actual one. If we are to defer | |
d0c26312 EB |
3653 | actually looking up the actual type, make an entry in the deferred |
3654 | list. If this is from a limited with, we have to defer to the end | |
3655 | of the current spec in two cases: first if the designated type is | |
3656 | in the current unit and second if the access type itself is. */ | |
3657 | if ((!in_main_unit || is_from_limited_with) && made_dummy) | |
a1ab4c31 | 3658 | { |
d0c26312 EB |
3659 | bool is_from_limited_with_in_main_unit |
3660 | = (is_from_limited_with | |
3661 | && (in_main_unit | |
3662 | || In_Extended_Main_Code_Unit (gnat_entity))); | |
3663 | tree gnu_old_desig_type | |
315cff15 | 3664 | = TYPE_IS_FAT_POINTER_P (gnu_type) |
a1ab4c31 AC |
3665 | ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type); |
3666 | ||
3667 | if (esize == POINTER_SIZE | |
315cff15 | 3668 | && (got_fat_p || TYPE_IS_FAT_POINTER_P (gnu_type))) |
a1ab4c31 AC |
3669 | gnu_type |
3670 | = build_pointer_type | |
3671 | (TYPE_OBJECT_RECORD_TYPE | |
3672 | (TYPE_UNCONSTRAINED_ARRAY (gnu_type))); | |
3673 | ||
0fb2335d | 3674 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
a1ab4c31 AC |
3675 | !Comes_From_Source (gnat_entity), |
3676 | debug_info_p, gnat_entity); | |
3677 | this_made_decl = true; | |
3678 | gnu_type = TREE_TYPE (gnu_decl); | |
3679 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
3680 | saved = true; | |
3681 | ||
d0c26312 EB |
3682 | /* Note that the call to gnat_to_gnu_type on gnat_desig_equiv might |
3683 | update gnu_old_desig_type directly, in which case it will not be | |
3684 | a dummy type any more when we get into update_pointer_to. | |
a1ab4c31 | 3685 | |
d0c26312 EB |
3686 | This can happen e.g. when the designated type is a record type, |
3687 | because their elaboration starts with an initial node from | |
3688 | make_dummy_type, which may be the same node as the one we got. | |
a1ab4c31 | 3689 | |
d0c26312 EB |
3690 | Besides, variants of this non-dummy type might have been created |
3691 | along the way. update_pointer_to is expected to properly take | |
3692 | care of those situations. */ | |
3693 | if (!defer_incomplete_level && !is_from_limited_with_in_main_unit) | |
3694 | update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_desig_type), | |
3695 | gnat_to_gnu_type (gnat_desig_equiv)); | |
a1ab4c31 AC |
3696 | else |
3697 | { | |
d0c26312 | 3698 | struct incomplete *p = XNEW (struct incomplete); |
a1ab4c31 | 3699 | struct incomplete **head |
d0c26312 | 3700 | = (is_from_limited_with_in_main_unit |
a1ab4c31 | 3701 | ? &defer_limited_with : &defer_incomplete_list); |
d0c26312 | 3702 | p->old_type = gnu_old_desig_type; |
a1ab4c31 AC |
3703 | p->full_type = gnat_desig_equiv; |
3704 | p->next = *head; | |
3705 | *head = p; | |
3706 | } | |
3707 | } | |
3708 | } | |
3709 | break; | |
3710 | ||
3711 | case E_Access_Protected_Subprogram_Type: | |
3712 | case E_Anonymous_Access_Protected_Subprogram_Type: | |
3713 | if (type_annotate_only && No (gnat_equiv_type)) | |
3714 | gnu_type = ptr_void_type_node; | |
3715 | else | |
3716 | { | |
c01fe451 | 3717 | /* The run-time representation is the equivalent type. */ |
a1ab4c31 | 3718 | gnu_type = gnat_to_gnu_type (gnat_equiv_type); |
2ddc34ba | 3719 | maybe_present = true; |
a1ab4c31 AC |
3720 | } |
3721 | ||
3722 | if (Is_Itype (Directly_Designated_Type (gnat_entity)) | |
3723 | && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) | |
3724 | && No (Freeze_Node (Directly_Designated_Type (gnat_entity))) | |
3725 | && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity)))) | |
3726 | gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), | |
3727 | NULL_TREE, 0); | |
3728 | ||
3729 | break; | |
3730 | ||
3731 | case E_Access_Subtype: | |
3732 | ||
3733 | /* We treat this as identical to its base type; any constraint is | |
3734 | meaningful only to the front end. | |
3735 | ||
3736 | The designated type must be elaborated as well, if it does | |
2ddc34ba | 3737 | not have its own freeze node. Designated (sub)types created |
a1ab4c31 AC |
3738 | for constrained components of records with discriminants are |
3739 | not frozen by the front end and thus not elaborated by gigi, | |
3740 | because their use may appear before the base type is frozen, | |
3741 | and because it is not clear that they are needed anywhere in | |
2ddc34ba | 3742 | Gigi. With the current model, there is no correct place where |
a1ab4c31 AC |
3743 | they could be elaborated. */ |
3744 | ||
3745 | gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
3746 | if (Is_Itype (Directly_Designated_Type (gnat_entity)) | |
3747 | && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) | |
3748 | && Is_Frozen (Directly_Designated_Type (gnat_entity)) | |
3749 | && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))) | |
3750 | { | |
3751 | /* If we are not defining this entity, and we have incomplete | |
3752 | entities being processed above us, make a dummy type and | |
3753 | elaborate it later. */ | |
3754 | if (!definition && defer_incomplete_level != 0) | |
3755 | { | |
3756 | struct incomplete *p | |
3757 | = (struct incomplete *) xmalloc (sizeof (struct incomplete)); | |
3758 | tree gnu_ptr_type | |
3759 | = build_pointer_type | |
3760 | (make_dummy_type (Directly_Designated_Type (gnat_entity))); | |
3761 | ||
3762 | p->old_type = TREE_TYPE (gnu_ptr_type); | |
3763 | p->full_type = Directly_Designated_Type (gnat_entity); | |
3764 | p->next = defer_incomplete_list; | |
3765 | defer_incomplete_list = p; | |
3766 | } | |
3767 | else if (!IN (Ekind (Base_Type | |
3768 | (Directly_Designated_Type (gnat_entity))), | |
3769 | Incomplete_Or_Private_Kind)) | |
3770 | gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), | |
3771 | NULL_TREE, 0); | |
3772 | } | |
3773 | ||
3774 | maybe_present = true; | |
3775 | break; | |
3776 | ||
3777 | /* Subprogram Entities | |
3778 | ||
3779 | The following access functions are defined for subprograms (functions | |
3780 | or procedures): | |
3781 | ||
3782 | First_Formal The first formal parameter. | |
3783 | Is_Imported Indicates that the subprogram has appeared in | |
2ddc34ba | 3784 | an INTERFACE or IMPORT pragma. For now we |
a1ab4c31 AC |
3785 | assume that the external language is C. |
3786 | Is_Exported Likewise but for an EXPORT pragma. | |
3787 | Is_Inlined True if the subprogram is to be inlined. | |
3788 | ||
3789 | In addition for function subprograms we have: | |
3790 | ||
3791 | Etype Return type of the function. | |
3792 | ||
3793 | Each parameter is first checked by calling must_pass_by_ref on its | |
3794 | type to determine if it is passed by reference. For parameters which | |
3795 | are copied in, if they are Ada In Out or Out parameters, their return | |
3796 | value becomes part of a record which becomes the return type of the | |
3797 | function (C function - note that this applies only to Ada procedures | |
2ddc34ba | 3798 | so there is no Ada return type). Additional code to store back the |
a1ab4c31 AC |
3799 | parameters will be generated on the caller side. This transformation |
3800 | is done here, not in the front-end. | |
3801 | ||
3802 | The intended result of the transformation can be seen from the | |
3803 | equivalent source rewritings that follow: | |
3804 | ||
3805 | struct temp {int a,b}; | |
3806 | procedure P (A,B: In Out ...) is temp P (int A,B) | |
3807 | begin { | |
3808 | .. .. | |
3809 | end P; return {A,B}; | |
3810 | } | |
3811 | ||
3812 | temp t; | |
3813 | P(X,Y); t = P(X,Y); | |
3814 | X = t.a , Y = t.b; | |
3815 | ||
3816 | For subprogram types we need to perform mainly the same conversions to | |
3817 | GCC form that are needed for procedures and function declarations. The | |
3818 | only difference is that at the end, we make a type declaration instead | |
3819 | of a function declaration. */ | |
3820 | ||
3821 | case E_Subprogram_Type: | |
3822 | case E_Function: | |
3823 | case E_Procedure: | |
3824 | { | |
3825 | /* The first GCC parameter declaration (a PARM_DECL node). The | |
3826 | PARM_DECL nodes are chained through the TREE_CHAIN field, so this | |
3827 | actually is the head of this parameter list. */ | |
3828 | tree gnu_param_list = NULL_TREE; | |
3829 | /* Likewise for the stub associated with an exported procedure. */ | |
3830 | tree gnu_stub_param_list = NULL_TREE; | |
2ddc34ba | 3831 | /* The type returned by a function. If the subprogram is a procedure |
a1ab4c31 AC |
3832 | this type should be void_type_node. */ |
3833 | tree gnu_return_type = void_type_node; | |
3834 | /* List of fields in return type of procedure with copy-in copy-out | |
3835 | parameters. */ | |
3836 | tree gnu_field_list = NULL_TREE; | |
3837 | /* Non-null for subprograms containing parameters passed by copy-in | |
3838 | copy-out (Ada In Out or Out parameters not passed by reference), | |
d47d0a8d EB |
3839 | in which case it is the list of nodes used to specify the values |
3840 | of the In Out/Out parameters that are returned as a record upon | |
a1ab4c31 AC |
3841 | procedure return. The TREE_PURPOSE of an element of this list is |
3842 | a field of the record and the TREE_VALUE is the PARM_DECL | |
3843 | corresponding to that field. This list will be saved in the | |
3844 | TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */ | |
d47d0a8d | 3845 | tree gnu_cico_list = NULL_TREE; |
a1ab4c31 AC |
3846 | /* If an import pragma asks to map this subprogram to a GCC builtin, |
3847 | this is the builtin DECL node. */ | |
3848 | tree gnu_builtin_decl = NULL_TREE; | |
3849 | /* For the stub associated with an exported procedure. */ | |
3850 | tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE; | |
3851 | tree gnu_ext_name = create_concat_name (gnat_entity, NULL); | |
3852 | Entity_Id gnat_param; | |
3853 | bool inline_flag = Is_Inlined (gnat_entity); | |
3854 | bool public_flag = Is_Public (gnat_entity) || imported_p; | |
3855 | bool extern_flag | |
3856 | = (Is_Public (gnat_entity) && !definition) || imported_p; | |
255e5b04 OH |
3857 | |
3858 | /* The semantics of "pure" in Ada essentially matches that of "const" | |
3859 | in the back-end. In particular, both properties are orthogonal to | |
3860 | the "nothrow" property if the EH circuitry is explicit in the | |
3861 | internal representation of the back-end. If we are to completely | |
3862 | hide the EH circuitry from it, we need to declare that calls to pure | |
3863 | Ada subprograms that can throw have side effects since they can | |
3864 | trigger an "abnormal" transfer of control flow; thus they can be | |
3865 | neither "const" nor "pure" in the back-end sense. */ | |
3866 | bool const_flag | |
3867 | = (Exception_Mechanism == Back_End_Exceptions | |
3868 | && Is_Pure (gnat_entity)); | |
3869 | ||
a1ab4c31 | 3870 | bool volatile_flag = No_Return (gnat_entity); |
d47d0a8d EB |
3871 | bool return_by_direct_ref_p = false; |
3872 | bool return_by_invisi_ref_p = false; | |
3873 | bool return_unconstrained_p = false; | |
a1ab4c31 AC |
3874 | bool has_copy_in_out = false; |
3875 | bool has_stub = false; | |
3876 | int parmnum; | |
3877 | ||
8cd28148 EB |
3878 | /* A parameter may refer to this type, so defer completion of any |
3879 | incomplete types. */ | |
a1ab4c31 | 3880 | if (kind == E_Subprogram_Type && !definition) |
8cd28148 EB |
3881 | { |
3882 | defer_incomplete_level++; | |
3883 | this_deferred = true; | |
3884 | } | |
a1ab4c31 AC |
3885 | |
3886 | /* If the subprogram has an alias, it is probably inherited, so | |
3887 | we can use the original one. If the original "subprogram" | |
3888 | is actually an enumeration literal, it may be the first use | |
3889 | of its type, so we must elaborate that type now. */ | |
3890 | if (Present (Alias (gnat_entity))) | |
3891 | { | |
3892 | if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal) | |
3893 | gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0); | |
3894 | ||
3895 | gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity), | |
3896 | gnu_expr, 0); | |
3897 | ||
3898 | /* Elaborate any Itypes in the parameters of this entity. */ | |
3899 | for (gnat_temp = First_Formal_With_Extras (gnat_entity); | |
3900 | Present (gnat_temp); | |
3901 | gnat_temp = Next_Formal_With_Extras (gnat_temp)) | |
3902 | if (Is_Itype (Etype (gnat_temp))) | |
3903 | gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); | |
3904 | ||
3905 | break; | |
3906 | } | |
3907 | ||
3908 | /* If this subprogram is expectedly bound to a GCC builtin, fetch the | |
bb511fbd OH |
3909 | corresponding DECL node. Proper generation of calls later on need |
3910 | proper parameter associations so we don't "break;" here. */ | |
1515785d OH |
3911 | if (Convention (gnat_entity) == Convention_Intrinsic |
3912 | && Present (Interface_Name (gnat_entity))) | |
3913 | { | |
3914 | gnu_builtin_decl = builtin_decl_for (gnu_ext_name); | |
3915 | ||
bb511fbd OH |
3916 | /* Unability to find the builtin decl most often indicates a |
3917 | genuine mistake, but imports of unregistered intrinsics are | |
3918 | sometimes issued on purpose to allow hooking in alternate | |
3919 | bodies. We post a warning conditioned on Wshadow in this case, | |
3920 | to let developers be notified on demand without risking false | |
3921 | positives with common default sets of options. */ | |
3922 | ||
3923 | if (gnu_builtin_decl == NULL_TREE && warn_shadow) | |
1515785d OH |
3924 | post_error ("?gcc intrinsic not found for&!", gnat_entity); |
3925 | } | |
a1ab4c31 AC |
3926 | |
3927 | /* ??? What if we don't find the builtin node above ? warn ? err ? | |
3928 | In the current state we neither warn nor err, and calls will just | |
2ddc34ba | 3929 | be handled as for regular subprograms. */ |
a1ab4c31 AC |
3930 | |
3931 | if (kind == E_Function || kind == E_Subprogram_Type) | |
3932 | gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
3933 | ||
d47d0a8d EB |
3934 | /* If this function returns by reference, make the actual return |
3935 | type of this function the pointer and mark the decl. */ | |
a1ab4c31 AC |
3936 | if (Returns_By_Ref (gnat_entity)) |
3937 | { | |
a1ab4c31 | 3938 | gnu_return_type = build_pointer_type (gnu_return_type); |
d47d0a8d | 3939 | return_by_direct_ref_p = true; |
a1ab4c31 AC |
3940 | } |
3941 | ||
d47d0a8d EB |
3942 | /* If the Mechanism is By_Reference, ensure this function uses the |
3943 | target's by-invisible-reference mechanism, which may not be the | |
3944 | same as above (e.g. it might be passing an extra parameter). | |
3945 | ||
3946 | Prior to GCC 4, this was handled by just setting TREE_ADDRESSABLE | |
3947 | on the result type. Everything required to pass by invisible | |
3948 | reference using the target's mechanism (e.g. an extra parameter) | |
3949 | was handled at RTL expansion time. | |
3950 | ||
3951 | This doesn't work with GCC 4 any more for several reasons. First, | |
3952 | the gimplification process might need to create temporaries of this | |
3953 | type and the gimplifier ICEs on such attempts; that's why the flag | |
3954 | is now set on the function type instead. Second, the middle-end | |
3955 | now also relies on a different attribute, DECL_BY_REFERENCE on the | |
3956 | RESULT_DECL, and expects the by-invisible-reference-ness to be made | |
3957 | explicit in the function body. */ | |
3958 | else if (kind == E_Function && Mechanism (gnat_entity) == By_Reference) | |
3959 | return_by_invisi_ref_p = true; | |
3960 | ||
3961 | /* If we are supposed to return an unconstrained array, actually return | |
3962 | a fat pointer and make a note of that. */ | |
a1ab4c31 AC |
3963 | else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE) |
3964 | { | |
3965 | gnu_return_type = TREE_TYPE (gnu_return_type); | |
d47d0a8d | 3966 | return_unconstrained_p = true; |
a1ab4c31 AC |
3967 | } |
3968 | ||
3969 | /* If the type requires a transient scope, the result is allocated | |
3970 | on the secondary stack, so the result type of the function is | |
3971 | just a pointer. */ | |
3972 | else if (Requires_Transient_Scope (Etype (gnat_entity))) | |
3973 | { | |
3974 | gnu_return_type = build_pointer_type (gnu_return_type); | |
d47d0a8d | 3975 | return_unconstrained_p = true; |
a1ab4c31 AC |
3976 | } |
3977 | ||
3978 | /* If the type is a padded type and the underlying type would not | |
3979 | be passed by reference or this function has a foreign convention, | |
3980 | return the underlying type. */ | |
315cff15 | 3981 | else if (TYPE_IS_PADDING_P (gnu_return_type) |
a1ab4c31 AC |
3982 | && (!default_pass_by_ref (TREE_TYPE |
3983 | (TYPE_FIELDS (gnu_return_type))) | |
3984 | || Has_Foreign_Convention (gnat_entity))) | |
3985 | gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type)); | |
3986 | ||
d47d0a8d EB |
3987 | /* If the return type is unconstrained, that means it must have a |
3988 | maximum size. Use the padded type as the effective return type. | |
3989 | And ensure the function uses the target's by-invisible-reference | |
3990 | mechanism to avoid copying too much data when it returns. */ | |
3991 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type))) | |
a1ab4c31 | 3992 | { |
d47d0a8d EB |
3993 | gnu_return_type |
3994 | = maybe_pad_type (gnu_return_type, | |
3995 | max_size (TYPE_SIZE (gnu_return_type), true), | |
3996 | 0, gnat_entity, false, false, false, true); | |
3997 | return_by_invisi_ref_p = true; | |
a1ab4c31 AC |
3998 | } |
3999 | ||
4000 | /* If the return type has a size that overflows, we cannot have | |
4001 | a function that returns that type. This usage doesn't make | |
4002 | sense anyway, so give an error here. */ | |
4003 | if (TYPE_SIZE_UNIT (gnu_return_type) | |
4004 | && TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)) | |
4005 | && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_return_type))) | |
4006 | { | |
4007 | post_error ("cannot return type whose size overflows", | |
4008 | gnat_entity); | |
4009 | gnu_return_type = copy_node (gnu_return_type); | |
4010 | TYPE_SIZE (gnu_return_type) = bitsize_zero_node; | |
4011 | TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node; | |
4012 | TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type; | |
4013 | TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE; | |
4014 | } | |
4015 | ||
4016 | /* Look at all our parameters and get the type of | |
4017 | each. While doing this, build a copy-out structure if | |
4018 | we need one. */ | |
4019 | ||
4020 | /* Loop over the parameters and get their associated GCC tree. | |
4021 | While doing this, build a copy-out structure if we need one. */ | |
4022 | for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0; | |
4023 | Present (gnat_param); | |
4024 | gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++) | |
4025 | { | |
4026 | tree gnu_param_name = get_entity_name (gnat_param); | |
4027 | tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param)); | |
4028 | tree gnu_param, gnu_field; | |
4029 | bool copy_in_copy_out = false; | |
4030 | Mechanism_Type mech = Mechanism (gnat_param); | |
4031 | ||
4032 | /* Builtins are expanded inline and there is no real call sequence | |
4033 | involved. So the type expected by the underlying expander is | |
4034 | always the type of each argument "as is". */ | |
4035 | if (gnu_builtin_decl) | |
4036 | mech = By_Copy; | |
4037 | /* Handle the first parameter of a valued procedure specially. */ | |
4038 | else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0) | |
4039 | mech = By_Copy_Return; | |
4040 | /* Otherwise, see if a Mechanism was supplied that forced this | |
4041 | parameter to be passed one way or another. */ | |
4042 | else if (mech == Default | |
4043 | || mech == By_Copy || mech == By_Reference) | |
4044 | ; | |
4045 | else if (By_Descriptor_Last <= mech && mech <= By_Descriptor) | |
4046 | mech = By_Descriptor; | |
d628c015 DR |
4047 | |
4048 | else if (By_Short_Descriptor_Last <= mech && | |
4049 | mech <= By_Short_Descriptor) | |
4050 | mech = By_Short_Descriptor; | |
4051 | ||
a1ab4c31 AC |
4052 | else if (mech > 0) |
4053 | { | |
4054 | if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE | |
4055 | || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST | |
4056 | || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type), | |
4057 | mech)) | |
4058 | mech = By_Reference; | |
4059 | else | |
4060 | mech = By_Copy; | |
4061 | } | |
4062 | else | |
4063 | { | |
4064 | post_error ("unsupported mechanism for&", gnat_param); | |
4065 | mech = Default; | |
4066 | } | |
4067 | ||
4068 | gnu_param | |
4069 | = gnat_to_gnu_param (gnat_param, mech, gnat_entity, | |
4070 | Has_Foreign_Convention (gnat_entity), | |
4071 | ©_in_copy_out); | |
4072 | ||
4073 | /* We are returned either a PARM_DECL or a type if no parameter | |
4074 | needs to be passed; in either case, adjust the type. */ | |
4075 | if (DECL_P (gnu_param)) | |
4076 | gnu_param_type = TREE_TYPE (gnu_param); | |
4077 | else | |
4078 | { | |
4079 | gnu_param_type = gnu_param; | |
4080 | gnu_param = NULL_TREE; | |
4081 | } | |
4082 | ||
4083 | if (gnu_param) | |
4084 | { | |
4085 | /* If it's an exported subprogram, we build a parameter list | |
4086 | in parallel, in case we need to emit a stub for it. */ | |
4087 | if (Is_Exported (gnat_entity)) | |
4088 | { | |
4089 | gnu_stub_param_list | |
4090 | = chainon (gnu_param, gnu_stub_param_list); | |
4091 | /* Change By_Descriptor parameter to By_Reference for | |
4092 | the internal version of an exported subprogram. */ | |
d628c015 | 4093 | if (mech == By_Descriptor || mech == By_Short_Descriptor) |
a1ab4c31 AC |
4094 | { |
4095 | gnu_param | |
4096 | = gnat_to_gnu_param (gnat_param, By_Reference, | |
4097 | gnat_entity, false, | |
4098 | ©_in_copy_out); | |
4099 | has_stub = true; | |
4100 | } | |
4101 | else | |
4102 | gnu_param = copy_node (gnu_param); | |
4103 | } | |
4104 | ||
4105 | gnu_param_list = chainon (gnu_param, gnu_param_list); | |
4106 | Sloc_to_locus (Sloc (gnat_param), | |
4107 | &DECL_SOURCE_LOCATION (gnu_param)); | |
4108 | save_gnu_tree (gnat_param, gnu_param, false); | |
4109 | ||
4110 | /* If a parameter is a pointer, this function may modify | |
4111 | memory through it and thus shouldn't be considered | |
255e5b04 | 4112 | a const function. Also, the memory may be modified |
a1ab4c31 AC |
4113 | between two calls, so they can't be CSE'ed. The latter |
4114 | case also handles by-ref parameters. */ | |
4115 | if (POINTER_TYPE_P (gnu_param_type) | |
315cff15 | 4116 | || TYPE_IS_FAT_POINTER_P (gnu_param_type)) |
255e5b04 | 4117 | const_flag = false; |
a1ab4c31 AC |
4118 | } |
4119 | ||
4120 | if (copy_in_copy_out) | |
4121 | { | |
4122 | if (!has_copy_in_out) | |
4123 | { | |
4124 | gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE); | |
4125 | gnu_return_type = make_node (RECORD_TYPE); | |
4126 | TYPE_NAME (gnu_return_type) = get_identifier ("RETURN"); | |
19c84694 EB |
4127 | /* Set a default alignment to speed up accesses. */ |
4128 | TYPE_ALIGN (gnu_return_type) | |
4129 | = get_mode_alignment (ptr_mode); | |
a1ab4c31 AC |
4130 | has_copy_in_out = true; |
4131 | } | |
4132 | ||
da01bfee EB |
4133 | gnu_field |
4134 | = create_field_decl (gnu_param_name, gnu_param_type, | |
4135 | gnu_return_type, NULL_TREE, NULL_TREE, | |
4136 | 0, 0); | |
a1ab4c31 AC |
4137 | Sloc_to_locus (Sloc (gnat_param), |
4138 | &DECL_SOURCE_LOCATION (gnu_field)); | |
910ad8de | 4139 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 | 4140 | gnu_field_list = gnu_field; |
d47d0a8d EB |
4141 | gnu_cico_list |
4142 | = tree_cons (gnu_field, gnu_param, gnu_cico_list); | |
a1ab4c31 AC |
4143 | } |
4144 | } | |
4145 | ||
4146 | /* Do not compute record for out parameters if subprogram is | |
4147 | stubbed since structures are incomplete for the back-end. */ | |
4148 | if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed) | |
4149 | finish_record_type (gnu_return_type, nreverse (gnu_field_list), | |
032d1b71 | 4150 | 0, debug_info_p); |
a1ab4c31 AC |
4151 | |
4152 | /* If we have a CICO list but it has only one entry, we convert | |
4153 | this function into a function that simply returns that one | |
4154 | object. */ | |
d47d0a8d EB |
4155 | if (list_length (gnu_cico_list) == 1) |
4156 | gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list)); | |
a1ab4c31 AC |
4157 | |
4158 | if (Has_Stdcall_Convention (gnat_entity)) | |
4159 | prepend_one_attribute_to | |
4160 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, | |
4161 | get_identifier ("stdcall"), NULL_TREE, | |
4162 | gnat_entity); | |
4163 | ||
4164 | /* If we are on a target where stack realignment is needed for 'main' | |
4165 | to honor GCC's implicit expectations (stack alignment greater than | |
4166 | what the base ABI guarantees), ensure we do the same for foreign | |
4167 | convention subprograms as they might be used as callbacks from code | |
4168 | breaking such expectations. Note that this applies to task entry | |
4169 | points in particular. */ | |
4170 | if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN | |
4171 | && Has_Foreign_Convention (gnat_entity)) | |
4172 | prepend_one_attribute_to | |
4173 | (&attr_list, ATTR_MACHINE_ATTRIBUTE, | |
4174 | get_identifier ("force_align_arg_pointer"), NULL_TREE, | |
4175 | gnat_entity); | |
4176 | ||
4177 | /* The lists have been built in reverse. */ | |
4178 | gnu_param_list = nreverse (gnu_param_list); | |
4179 | if (has_stub) | |
4180 | gnu_stub_param_list = nreverse (gnu_stub_param_list); | |
d47d0a8d | 4181 | gnu_cico_list = nreverse (gnu_cico_list); |
a1ab4c31 AC |
4182 | |
4183 | if (Ekind (gnat_entity) == E_Function) | |
d47d0a8d EB |
4184 | Set_Mechanism (gnat_entity, return_unconstrained_p |
4185 | || return_by_direct_ref_p | |
4186 | || return_by_invisi_ref_p | |
4187 | ? By_Reference : By_Copy); | |
a1ab4c31 AC |
4188 | gnu_type |
4189 | = create_subprog_type (gnu_return_type, gnu_param_list, | |
d47d0a8d EB |
4190 | gnu_cico_list, return_unconstrained_p, |
4191 | return_by_direct_ref_p, | |
4192 | return_by_invisi_ref_p); | |
a1ab4c31 AC |
4193 | |
4194 | if (has_stub) | |
4195 | gnu_stub_type | |
4196 | = create_subprog_type (gnu_return_type, gnu_stub_param_list, | |
d47d0a8d EB |
4197 | gnu_cico_list, return_unconstrained_p, |
4198 | return_by_direct_ref_p, | |
4199 | return_by_invisi_ref_p); | |
a1ab4c31 AC |
4200 | |
4201 | /* A subprogram (something that doesn't return anything) shouldn't | |
255e5b04 | 4202 | be considered const since there would be no reason for such a |
a1ab4c31 | 4203 | subprogram. Note that procedures with Out (or In Out) parameters |
2ddc34ba | 4204 | have already been converted into a function with a return type. */ |
a1ab4c31 | 4205 | if (TREE_CODE (gnu_return_type) == VOID_TYPE) |
255e5b04 | 4206 | const_flag = false; |
2eee5152 | 4207 | |
a1ab4c31 AC |
4208 | gnu_type |
4209 | = build_qualified_type (gnu_type, | |
4210 | TYPE_QUALS (gnu_type) | |
255e5b04 | 4211 | | (TYPE_QUAL_CONST * const_flag) |
a1ab4c31 AC |
4212 | | (TYPE_QUAL_VOLATILE * volatile_flag)); |
4213 | ||
a1ab4c31 AC |
4214 | if (has_stub) |
4215 | gnu_stub_type | |
4216 | = build_qualified_type (gnu_stub_type, | |
4217 | TYPE_QUALS (gnu_stub_type) | |
255e5b04 | 4218 | | (TYPE_QUAL_CONST * const_flag) |
a1ab4c31 AC |
4219 | | (TYPE_QUAL_VOLATILE * volatile_flag)); |
4220 | ||
1515785d OH |
4221 | /* If we have a builtin decl for that function, use it. Check if the |
4222 | profiles are compatible and warn if they are not. The checker is | |
4223 | expected to post extra diagnostics in this case. */ | |
a1ab4c31 AC |
4224 | if (gnu_builtin_decl) |
4225 | { | |
1515785d | 4226 | intrin_binding_t inb; |
a1ab4c31 | 4227 | |
1515785d OH |
4228 | inb.gnat_entity = gnat_entity; |
4229 | inb.ada_fntype = gnu_type; | |
4230 | inb.btin_fntype = TREE_TYPE (gnu_builtin_decl); | |
4231 | ||
4232 | if (!intrin_profiles_compatible_p (&inb)) | |
4233 | post_error | |
bb511fbd | 4234 | ("?profile of& doesn''t match the builtin it binds!", |
1515785d OH |
4235 | gnat_entity); |
4236 | ||
4237 | gnu_decl = gnu_builtin_decl; | |
4238 | gnu_type = TREE_TYPE (gnu_builtin_decl); | |
4239 | break; | |
a1ab4c31 AC |
4240 | } |
4241 | ||
4242 | /* If there was no specified Interface_Name and the external and | |
4243 | internal names of the subprogram are the same, only use the | |
4244 | internal name to allow disambiguation of nested subprograms. */ | |
0fb2335d EB |
4245 | if (No (Interface_Name (gnat_entity)) |
4246 | && gnu_ext_name == gnu_entity_name) | |
a1ab4c31 AC |
4247 | gnu_ext_name = NULL_TREE; |
4248 | ||
4249 | /* If we are defining the subprogram and it has an Address clause | |
4250 | we must get the address expression from the saved GCC tree for the | |
4251 | subprogram if it has a Freeze_Node. Otherwise, we elaborate | |
4252 | the address expression here since the front-end has guaranteed | |
4253 | in that case that the elaboration has no effects. If there is | |
4254 | an Address clause and we are not defining the object, just | |
4255 | make it a constant. */ | |
4256 | if (Present (Address_Clause (gnat_entity))) | |
4257 | { | |
4258 | tree gnu_address = NULL_TREE; | |
4259 | ||
4260 | if (definition) | |
4261 | gnu_address | |
4262 | = (present_gnu_tree (gnat_entity) | |
4263 | ? get_gnu_tree (gnat_entity) | |
4264 | : gnat_to_gnu (Expression (Address_Clause (gnat_entity)))); | |
4265 | ||
4266 | save_gnu_tree (gnat_entity, NULL_TREE, false); | |
4267 | ||
4268 | /* Convert the type of the object to a reference type that can | |
4269 | alias everything as per 13.3(19). */ | |
4270 | gnu_type | |
4271 | = build_reference_type_for_mode (gnu_type, ptr_mode, true); | |
4272 | if (gnu_address) | |
4273 | gnu_address = convert (gnu_type, gnu_address); | |
4274 | ||
4275 | gnu_decl | |
0fb2335d | 4276 | = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, |
a1ab4c31 AC |
4277 | gnu_address, false, Is_Public (gnat_entity), |
4278 | extern_flag, false, NULL, gnat_entity); | |
4279 | DECL_BY_REF_P (gnu_decl) = 1; | |
4280 | } | |
4281 | ||
4282 | else if (kind == E_Subprogram_Type) | |
0fb2335d | 4283 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
a1ab4c31 AC |
4284 | !Comes_From_Source (gnat_entity), |
4285 | debug_info_p, gnat_entity); | |
4286 | else | |
4287 | { | |
4288 | if (has_stub) | |
4289 | { | |
4290 | gnu_stub_name = gnu_ext_name; | |
4291 | gnu_ext_name = create_concat_name (gnat_entity, "internal"); | |
4292 | public_flag = false; | |
4293 | } | |
4294 | ||
0fb2335d | 4295 | gnu_decl = create_subprog_decl (gnu_entity_name, gnu_ext_name, |
a1ab4c31 AC |
4296 | gnu_type, gnu_param_list, |
4297 | inline_flag, public_flag, | |
4298 | extern_flag, attr_list, | |
4299 | gnat_entity); | |
4300 | if (has_stub) | |
4301 | { | |
4302 | tree gnu_stub_decl | |
0fb2335d | 4303 | = create_subprog_decl (gnu_entity_name, gnu_stub_name, |
a1ab4c31 AC |
4304 | gnu_stub_type, gnu_stub_param_list, |
4305 | inline_flag, true, | |
4306 | extern_flag, attr_list, | |
4307 | gnat_entity); | |
4308 | SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl); | |
4309 | } | |
4310 | ||
4311 | /* This is unrelated to the stub built right above. */ | |
4312 | DECL_STUBBED_P (gnu_decl) | |
4313 | = Convention (gnat_entity) == Convention_Stubbed; | |
4314 | } | |
4315 | } | |
4316 | break; | |
4317 | ||
4318 | case E_Incomplete_Type: | |
4319 | case E_Incomplete_Subtype: | |
4320 | case E_Private_Type: | |
4321 | case E_Private_Subtype: | |
4322 | case E_Limited_Private_Type: | |
4323 | case E_Limited_Private_Subtype: | |
4324 | case E_Record_Type_With_Private: | |
4325 | case E_Record_Subtype_With_Private: | |
4326 | { | |
4327 | /* Get the "full view" of this entity. If this is an incomplete | |
4328 | entity from a limited with, treat its non-limited view as the | |
4329 | full view. Otherwise, use either the full view or the underlying | |
4330 | full view, whichever is present. This is used in all the tests | |
4331 | below. */ | |
4332 | Entity_Id full_view | |
4333 | = (IN (Ekind (gnat_entity), Incomplete_Kind) | |
4334 | && From_With_Type (gnat_entity)) | |
4335 | ? Non_Limited_View (gnat_entity) | |
4336 | : Present (Full_View (gnat_entity)) | |
4337 | ? Full_View (gnat_entity) | |
4338 | : Underlying_Full_View (gnat_entity); | |
4339 | ||
4340 | /* If this is an incomplete type with no full view, it must be a Taft | |
4341 | Amendment type, in which case we return a dummy type. Otherwise, | |
4342 | just get the type from its Etype. */ | |
4343 | if (No (full_view)) | |
4344 | { | |
4345 | if (kind == E_Incomplete_Type) | |
10069d53 EB |
4346 | { |
4347 | gnu_type = make_dummy_type (gnat_entity); | |
4348 | gnu_decl = TYPE_STUB_DECL (gnu_type); | |
4349 | } | |
a1ab4c31 AC |
4350 | else |
4351 | { | |
4352 | gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity), | |
4353 | NULL_TREE, 0); | |
4354 | maybe_present = true; | |
4355 | } | |
4356 | break; | |
4357 | } | |
4358 | ||
4359 | /* If we already made a type for the full view, reuse it. */ | |
4360 | else if (present_gnu_tree (full_view)) | |
4361 | { | |
4362 | gnu_decl = get_gnu_tree (full_view); | |
4363 | break; | |
4364 | } | |
4365 | ||
4366 | /* Otherwise, if we are not defining the type now, get the type | |
4367 | from the full view. But always get the type from the full view | |
4368 | for define on use types, since otherwise we won't see them! */ | |
4369 | else if (!definition | |
4370 | || (Is_Itype (full_view) | |
4371 | && No (Freeze_Node (gnat_entity))) | |
4372 | || (Is_Itype (gnat_entity) | |
4373 | && No (Freeze_Node (full_view)))) | |
4374 | { | |
4375 | gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0); | |
4376 | maybe_present = true; | |
4377 | break; | |
4378 | } | |
4379 | ||
4380 | /* For incomplete types, make a dummy type entry which will be | |
10069d53 EB |
4381 | replaced later. Save it as the full declaration's type so |
4382 | we can do any needed updates when we see it. */ | |
a1ab4c31 | 4383 | gnu_type = make_dummy_type (gnat_entity); |
10069d53 | 4384 | gnu_decl = TYPE_STUB_DECL (gnu_type); |
a1ab4c31 AC |
4385 | save_gnu_tree (full_view, gnu_decl, 0); |
4386 | break; | |
4387 | } | |
4388 | ||
a1ab4c31 | 4389 | case E_Class_Wide_Type: |
f08863f9 | 4390 | /* Class-wide types are always transformed into their root type. */ |
a1ab4c31 AC |
4391 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); |
4392 | maybe_present = true; | |
4393 | break; | |
4394 | ||
4395 | case E_Task_Type: | |
4396 | case E_Task_Subtype: | |
4397 | case E_Protected_Type: | |
4398 | case E_Protected_Subtype: | |
e6bdd039 | 4399 | /* Concurrent types are always transformed into their record type. */ |
a1ab4c31 AC |
4400 | if (type_annotate_only && No (gnat_equiv_type)) |
4401 | gnu_type = void_type_node; | |
4402 | else | |
e6bdd039 | 4403 | gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); |
a1ab4c31 AC |
4404 | maybe_present = true; |
4405 | break; | |
4406 | ||
4407 | case E_Label: | |
0fb2335d | 4408 | gnu_decl = create_label_decl (gnu_entity_name); |
a1ab4c31 AC |
4409 | break; |
4410 | ||
4411 | case E_Block: | |
4412 | case E_Loop: | |
4413 | /* Nothing at all to do here, so just return an ERROR_MARK and claim | |
4414 | we've already saved it, so we don't try to. */ | |
4415 | gnu_decl = error_mark_node; | |
4416 | saved = true; | |
4417 | break; | |
4418 | ||
4419 | default: | |
4420 | gcc_unreachable (); | |
4421 | } | |
4422 | ||
4423 | /* If we had a case where we evaluated another type and it might have | |
4424 | defined this one, handle it here. */ | |
4425 | if (maybe_present && present_gnu_tree (gnat_entity)) | |
4426 | { | |
4427 | gnu_decl = get_gnu_tree (gnat_entity); | |
4428 | saved = true; | |
4429 | } | |
4430 | ||
4431 | /* If we are processing a type and there is either no decl for it or | |
4432 | we just made one, do some common processing for the type, such as | |
4433 | handling alignment and possible padding. */ | |
a8e05f92 | 4434 | if (is_type && (!gnu_decl || this_made_decl)) |
a1ab4c31 | 4435 | { |
76af763d EB |
4436 | /* Tell the middle-end that objects of tagged types are guaranteed to |
4437 | be properly aligned. This is necessary because conversions to the | |
4438 | class-wide type are translated into conversions to the root type, | |
4439 | which can be less aligned than some of its derived types. */ | |
a1ab4c31 AC |
4440 | if (Is_Tagged_Type (gnat_entity) |
4441 | || Is_Class_Wide_Equivalent_Type (gnat_entity)) | |
4442 | TYPE_ALIGN_OK (gnu_type) = 1; | |
4443 | ||
cb3d597d EB |
4444 | /* If the type is passed by reference, objects of this type must be |
4445 | fully addressable and cannot be copied. */ | |
4446 | if (Is_By_Reference_Type (gnat_entity)) | |
4447 | TREE_ADDRESSABLE (gnu_type) = 1; | |
a1ab4c31 AC |
4448 | |
4449 | /* ??? Don't set the size for a String_Literal since it is either | |
4450 | confirming or we don't handle it properly (if the low bound is | |
4451 | non-constant). */ | |
4452 | if (!gnu_size && kind != E_String_Literal_Subtype) | |
4453 | gnu_size = validate_size (Esize (gnat_entity), gnu_type, gnat_entity, | |
4454 | TYPE_DECL, false, | |
4455 | Has_Size_Clause (gnat_entity)); | |
4456 | ||
4457 | /* If a size was specified, see if we can make a new type of that size | |
4458 | by rearranging the type, for example from a fat to a thin pointer. */ | |
4459 | if (gnu_size) | |
4460 | { | |
4461 | gnu_type | |
4462 | = make_type_from_size (gnu_type, gnu_size, | |
4463 | Has_Biased_Representation (gnat_entity)); | |
4464 | ||
4465 | if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0) | |
4466 | && operand_equal_p (rm_size (gnu_type), gnu_size, 0)) | |
4467 | gnu_size = 0; | |
4468 | } | |
4469 | ||
4470 | /* If the alignment hasn't already been processed and this is | |
4471 | not an unconstrained array, see if an alignment is specified. | |
4472 | If not, we pick a default alignment for atomic objects. */ | |
4473 | if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) | |
4474 | ; | |
4475 | else if (Known_Alignment (gnat_entity)) | |
4476 | { | |
4477 | align = validate_alignment (Alignment (gnat_entity), gnat_entity, | |
4478 | TYPE_ALIGN (gnu_type)); | |
4479 | ||
4480 | /* Warn on suspiciously large alignments. This should catch | |
4481 | errors about the (alignment,byte)/(size,bit) discrepancy. */ | |
4482 | if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity)) | |
4483 | { | |
4484 | tree size; | |
4485 | ||
4486 | /* If a size was specified, take it into account. Otherwise | |
4487 | use the RM size for records as the type size has already | |
4488 | been adjusted to the alignment. */ | |
4489 | if (gnu_size) | |
4490 | size = gnu_size; | |
4491 | else if ((TREE_CODE (gnu_type) == RECORD_TYPE | |
4492 | || TREE_CODE (gnu_type) == UNION_TYPE | |
4493 | || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) | |
315cff15 | 4494 | && !TYPE_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
4495 | size = rm_size (gnu_type); |
4496 | else | |
4497 | size = TYPE_SIZE (gnu_type); | |
4498 | ||
4499 | /* Consider an alignment as suspicious if the alignment/size | |
4500 | ratio is greater or equal to the byte/bit ratio. */ | |
4501 | if (host_integerp (size, 1) | |
4502 | && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT) | |
4503 | post_error_ne ("?suspiciously large alignment specified for&", | |
4504 | Expression (Alignment_Clause (gnat_entity)), | |
4505 | gnat_entity); | |
4506 | } | |
4507 | } | |
4508 | else if (Is_Atomic (gnat_entity) && !gnu_size | |
4509 | && host_integerp (TYPE_SIZE (gnu_type), 1) | |
4510 | && integer_pow2p (TYPE_SIZE (gnu_type))) | |
4511 | align = MIN (BIGGEST_ALIGNMENT, | |
4512 | tree_low_cst (TYPE_SIZE (gnu_type), 1)); | |
4513 | else if (Is_Atomic (gnat_entity) && gnu_size | |
4514 | && host_integerp (gnu_size, 1) | |
4515 | && integer_pow2p (gnu_size)) | |
4516 | align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1)); | |
4517 | ||
4518 | /* See if we need to pad the type. If we did, and made a record, | |
4519 | the name of the new type may be changed. So get it back for | |
4520 | us when we make the new TYPE_DECL below. */ | |
4521 | if (gnu_size || align > 0) | |
4522 | gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, | |
9a1c0fd9 | 4523 | false, !gnu_decl, definition, false); |
a1ab4c31 | 4524 | |
315cff15 | 4525 | if (TYPE_IS_PADDING_P (gnu_type)) |
a1ab4c31 | 4526 | { |
0fb2335d EB |
4527 | gnu_entity_name = TYPE_NAME (gnu_type); |
4528 | if (TREE_CODE (gnu_entity_name) == TYPE_DECL) | |
4529 | gnu_entity_name = DECL_NAME (gnu_entity_name); | |
a1ab4c31 AC |
4530 | } |
4531 | ||
4532 | set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity); | |
4533 | ||
4534 | /* If we are at global level, GCC will have applied variable_size to | |
4535 | the type, but that won't have done anything. So, if it's not | |
4536 | a constant or self-referential, call elaborate_expression_1 to | |
4537 | make a variable for the size rather than calculating it each time. | |
4538 | Handle both the RM size and the actual size. */ | |
4539 | if (global_bindings_p () | |
4540 | && TYPE_SIZE (gnu_type) | |
4541 | && !TREE_CONSTANT (TYPE_SIZE (gnu_type)) | |
4542 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
4543 | { | |
da01bfee EB |
4544 | tree size = TYPE_SIZE (gnu_type); |
4545 | ||
4546 | TYPE_SIZE (gnu_type) | |
4547 | = elaborate_expression_1 (size, gnat_entity, | |
4548 | get_identifier ("SIZE"), | |
4549 | definition, false); | |
4550 | ||
4551 | /* ??? For now, store the size as a multiple of the alignment in | |
4552 | bytes so that we can see the alignment from the tree. */ | |
4553 | TYPE_SIZE_UNIT (gnu_type) | |
4554 | = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_type), gnat_entity, | |
4555 | get_identifier ("SIZE_A_UNIT"), | |
4556 | definition, false, | |
4557 | TYPE_ALIGN (gnu_type)); | |
4558 | ||
4559 | /* ??? gnu_type may come from an existing type so the MULT_EXPR node | |
4560 | may not be marked by the call to create_type_decl below. */ | |
4561 | MARK_VISITED (TYPE_SIZE_UNIT (gnu_type)); | |
4562 | ||
4563 | if (TREE_CODE (gnu_type) == RECORD_TYPE) | |
a1ab4c31 | 4564 | { |
35e2a4b8 | 4565 | tree variant_part = get_variant_part (gnu_type); |
da01bfee | 4566 | tree ada_size = TYPE_ADA_SIZE (gnu_type); |
a1ab4c31 | 4567 | |
35e2a4b8 EB |
4568 | if (variant_part) |
4569 | { | |
4570 | tree union_type = TREE_TYPE (variant_part); | |
4571 | tree offset = DECL_FIELD_OFFSET (variant_part); | |
4572 | ||
4573 | /* If the position of the variant part is constant, subtract | |
4574 | it from the size of the type of the parent to get the new | |
4575 | size. This manual CSE reduces the data size. */ | |
4576 | if (TREE_CODE (offset) == INTEGER_CST) | |
4577 | { | |
4578 | tree bitpos = DECL_FIELD_BIT_OFFSET (variant_part); | |
4579 | TYPE_SIZE (union_type) | |
4580 | = size_binop (MINUS_EXPR, TYPE_SIZE (gnu_type), | |
4581 | bit_from_pos (offset, bitpos)); | |
4582 | TYPE_SIZE_UNIT (union_type) | |
4583 | = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (gnu_type), | |
4584 | byte_from_pos (offset, bitpos)); | |
4585 | } | |
4586 | else | |
4587 | { | |
4588 | TYPE_SIZE (union_type) | |
4589 | = elaborate_expression_1 (TYPE_SIZE (union_type), | |
4590 | gnat_entity, | |
4591 | get_identifier ("VSIZE"), | |
4592 | definition, false); | |
4593 | ||
4594 | /* ??? For now, store the size as a multiple of the | |
4595 | alignment in bytes so that we can see the alignment | |
4596 | from the tree. */ | |
4597 | TYPE_SIZE_UNIT (union_type) | |
4598 | = elaborate_expression_2 (TYPE_SIZE_UNIT (union_type), | |
4599 | gnat_entity, | |
4600 | get_identifier | |
4601 | ("VSIZE_A_UNIT"), | |
4602 | definition, false, | |
4603 | TYPE_ALIGN (union_type)); | |
4604 | ||
4605 | /* ??? For now, store the offset as a multiple of the | |
4606 | alignment in bytes so that we can see the alignment | |
4607 | from the tree. */ | |
4608 | DECL_FIELD_OFFSET (variant_part) | |
4609 | = elaborate_expression_2 (offset, | |
4610 | gnat_entity, | |
4611 | get_identifier ("VOFFSET"), | |
4612 | definition, false, | |
4613 | DECL_OFFSET_ALIGN | |
4614 | (variant_part)); | |
4615 | } | |
4616 | ||
4617 | DECL_SIZE (variant_part) = TYPE_SIZE (union_type); | |
4618 | DECL_SIZE_UNIT (variant_part) = TYPE_SIZE_UNIT (union_type); | |
4619 | } | |
4620 | ||
da01bfee EB |
4621 | if (operand_equal_p (ada_size, size, 0)) |
4622 | ada_size = TYPE_SIZE (gnu_type); | |
4623 | else | |
4624 | ada_size | |
4625 | = elaborate_expression_1 (ada_size, gnat_entity, | |
4626 | get_identifier ("RM_SIZE"), | |
4627 | definition, false); | |
4628 | SET_TYPE_ADA_SIZE (gnu_type, ada_size); | |
4629 | } | |
a1ab4c31 AC |
4630 | } |
4631 | ||
4632 | /* If this is a record type or subtype, call elaborate_expression_1 on | |
4633 | any field position. Do this for both global and local types. | |
4634 | Skip any fields that we haven't made trees for to avoid problems with | |
4635 | class wide types. */ | |
4636 | if (IN (kind, Record_Kind)) | |
4637 | for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp); | |
4638 | gnat_temp = Next_Entity (gnat_temp)) | |
4639 | if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp)) | |
4640 | { | |
4641 | tree gnu_field = get_gnu_tree (gnat_temp); | |
4642 | ||
da01bfee EB |
4643 | /* ??? For now, store the offset as a multiple of the alignment |
4644 | in bytes so that we can see the alignment from the tree. */ | |
a1ab4c31 AC |
4645 | if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field))) |
4646 | { | |
da01bfee EB |
4647 | DECL_FIELD_OFFSET (gnu_field) |
4648 | = elaborate_expression_2 (DECL_FIELD_OFFSET (gnu_field), | |
4649 | gnat_temp, | |
4650 | get_identifier ("OFFSET"), | |
4651 | definition, false, | |
4652 | DECL_OFFSET_ALIGN (gnu_field)); | |
4653 | ||
4654 | /* ??? The context of gnu_field is not necessarily gnu_type | |
4655 | so the MULT_EXPR node built above may not be marked by | |
4656 | the call to create_type_decl below. */ | |
4657 | if (global_bindings_p ()) | |
4658 | MARK_VISITED (DECL_FIELD_OFFSET (gnu_field)); | |
a1ab4c31 AC |
4659 | } |
4660 | } | |
4661 | ||
7c20033e EB |
4662 | if (Treat_As_Volatile (gnat_entity)) |
4663 | gnu_type | |
4664 | = build_qualified_type (gnu_type, | |
4665 | TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE); | |
a1ab4c31 AC |
4666 | |
4667 | if (Is_Atomic (gnat_entity)) | |
4668 | check_ok_for_atomic (gnu_type, gnat_entity, false); | |
4669 | ||
4670 | if (Present (Alignment_Clause (gnat_entity))) | |
4671 | TYPE_USER_ALIGN (gnu_type) = 1; | |
4672 | ||
4673 | if (Universal_Aliasing (gnat_entity)) | |
4674 | TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1; | |
4675 | ||
4676 | if (!gnu_decl) | |
0fb2335d | 4677 | gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, |
a1ab4c31 AC |
4678 | !Comes_From_Source (gnat_entity), |
4679 | debug_info_p, gnat_entity); | |
4680 | else | |
9a1c0fd9 EB |
4681 | { |
4682 | TREE_TYPE (gnu_decl) = gnu_type; | |
4683 | TYPE_STUB_DECL (gnu_type) = gnu_decl; | |
4684 | } | |
a1ab4c31 AC |
4685 | } |
4686 | ||
a8e05f92 | 4687 | if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))) |
a1ab4c31 AC |
4688 | { |
4689 | gnu_type = TREE_TYPE (gnu_decl); | |
4690 | ||
794511d2 EB |
4691 | /* If this is a derived type, relate its alias set to that of its parent |
4692 | to avoid troubles when a call to an inherited primitive is inlined in | |
4693 | a context where a derived object is accessed. The inlined code works | |
4694 | on the parent view so the resulting code may access the same object | |
4695 | using both the parent and the derived alias sets, which thus have to | |
4696 | conflict. As the same issue arises with component references, the | |
4697 | parent alias set also has to conflict with composite types enclosing | |
4698 | derived components. For instance, if we have: | |
4699 | ||
4700 | type D is new T; | |
4701 | type R is record | |
4702 | Component : D; | |
4703 | end record; | |
4704 | ||
4705 | we want T to conflict with both D and R, in addition to R being a | |
4706 | superset of D by record/component construction. | |
4707 | ||
4708 | One way to achieve this is to perform an alias set copy from the | |
4709 | parent to the derived type. This is not quite appropriate, though, | |
4710 | as we don't want separate derived types to conflict with each other: | |
4711 | ||
4712 | type I1 is new Integer; | |
4713 | type I2 is new Integer; | |
4714 | ||
4715 | We want I1 and I2 to both conflict with Integer but we do not want | |
4716 | I1 to conflict with I2, and an alias set copy on derivation would | |
4717 | have that effect. | |
4718 | ||
4719 | The option chosen is to make the alias set of the derived type a | |
4720 | superset of that of its parent type. It trivially fulfills the | |
4721 | simple requirement for the Integer derivation example above, and | |
4722 | the component case as well by superset transitivity: | |
4723 | ||
4724 | superset superset | |
4725 | R ----------> D ----------> T | |
4726 | ||
d8e94f79 EB |
4727 | However, for composite types, conversions between derived types are |
4728 | translated into VIEW_CONVERT_EXPRs so a sequence like: | |
4729 | ||
4730 | type Comp1 is new Comp; | |
4731 | type Comp2 is new Comp; | |
4732 | procedure Proc (C : Comp1); | |
4733 | ||
4734 | C : Comp2; | |
4735 | Proc (Comp1 (C)); | |
4736 | ||
4737 | is translated into: | |
4738 | ||
4739 | C : Comp2; | |
4740 | Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C)); | |
4741 | ||
4742 | and gimplified into: | |
4743 | ||
4744 | C : Comp2; | |
4745 | Comp1 *C.0; | |
4746 | C.0 = (Comp1 *) &C; | |
4747 | Proc (C.0); | |
4748 | ||
4749 | i.e. generates code involving type punning. Therefore, Comp1 needs | |
4750 | to conflict with Comp2 and an alias set copy is required. | |
4751 | ||
794511d2 EB |
4752 | The language rules ensure the parent type is already frozen here. */ |
4753 | if (Is_Derived_Type (gnat_entity)) | |
4754 | { | |
4755 | tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity)); | |
d8e94f79 EB |
4756 | relate_alias_sets (gnu_type, gnu_parent_type, |
4757 | Is_Composite_Type (gnat_entity) | |
4758 | ? ALIAS_SET_COPY : ALIAS_SET_SUPERSET); | |
794511d2 EB |
4759 | } |
4760 | ||
a1ab4c31 AC |
4761 | /* Back-annotate the Alignment of the type if not already in the |
4762 | tree. Likewise for sizes. */ | |
4763 | if (Unknown_Alignment (gnat_entity)) | |
caa9d12a EB |
4764 | { |
4765 | unsigned int double_align, align; | |
4766 | bool is_capped_double, align_clause; | |
4767 | ||
4768 | /* If the default alignment of "double" or larger scalar types is | |
4769 | specifically capped and this is not an array with an alignment | |
4770 | clause on the component type, return the cap. */ | |
4771 | if ((double_align = double_float_alignment) > 0) | |
4772 | is_capped_double | |
4773 | = is_double_float_or_array (gnat_entity, &align_clause); | |
4774 | else if ((double_align = double_scalar_alignment) > 0) | |
4775 | is_capped_double | |
4776 | = is_double_scalar_or_array (gnat_entity, &align_clause); | |
4777 | else | |
4778 | is_capped_double = align_clause = false; | |
4779 | ||
4780 | if (is_capped_double && !align_clause) | |
4781 | align = double_align; | |
4782 | else | |
4783 | align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT; | |
4784 | ||
4785 | Set_Alignment (gnat_entity, UI_From_Int (align)); | |
4786 | } | |
a1ab4c31 AC |
4787 | |
4788 | if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type)) | |
4789 | { | |
a1ab4c31 AC |
4790 | tree gnu_size = TYPE_SIZE (gnu_type); |
4791 | ||
58c8f770 | 4792 | /* If the size is self-referential, annotate the maximum value. */ |
a1ab4c31 AC |
4793 | if (CONTAINS_PLACEHOLDER_P (gnu_size)) |
4794 | gnu_size = max_size (gnu_size, true); | |
4795 | ||
a1ab4c31 AC |
4796 | if (type_annotate_only && Is_Tagged_Type (gnat_entity)) |
4797 | { | |
58c8f770 EB |
4798 | /* In this mode, the tag and the parent components are not |
4799 | generated by the front-end so the sizes must be adjusted. */ | |
4800 | tree pointer_size = bitsize_int (POINTER_SIZE), offset; | |
4801 | Uint uint_size; | |
a1ab4c31 AC |
4802 | |
4803 | if (Is_Derived_Type (gnat_entity)) | |
4804 | { | |
58c8f770 EB |
4805 | offset = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))), |
4806 | bitsizetype); | |
a1ab4c31 AC |
4807 | Set_Alignment (gnat_entity, |
4808 | Alignment (Etype (Base_Type (gnat_entity)))); | |
4809 | } | |
4810 | else | |
58c8f770 EB |
4811 | offset = pointer_size; |
4812 | ||
4813 | gnu_size = size_binop (PLUS_EXPR, gnu_size, offset); | |
4814 | gnu_size = size_binop (MULT_EXPR, pointer_size, | |
4815 | size_binop (CEIL_DIV_EXPR, | |
4816 | gnu_size, | |
4817 | pointer_size)); | |
4818 | uint_size = annotate_value (gnu_size); | |
4819 | Set_Esize (gnat_entity, uint_size); | |
4820 | Set_RM_Size (gnat_entity, uint_size); | |
a1ab4c31 | 4821 | } |
58c8f770 EB |
4822 | else |
4823 | Set_Esize (gnat_entity, annotate_value (gnu_size)); | |
a1ab4c31 AC |
4824 | } |
4825 | ||
4826 | if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type)) | |
4827 | Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type))); | |
4828 | } | |
4829 | ||
4830 | if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl)) | |
4831 | DECL_ARTIFICIAL (gnu_decl) = 1; | |
4832 | ||
4833 | if (!debug_info_p && DECL_P (gnu_decl) | |
4834 | && TREE_CODE (gnu_decl) != FUNCTION_DECL | |
4835 | && No (Renamed_Object (gnat_entity))) | |
4836 | DECL_IGNORED_P (gnu_decl) = 1; | |
4837 | ||
4838 | /* If we haven't already, associate the ..._DECL node that we just made with | |
2ddc34ba | 4839 | the input GNAT entity node. */ |
a1ab4c31 AC |
4840 | if (!saved) |
4841 | save_gnu_tree (gnat_entity, gnu_decl, false); | |
4842 | ||
c1abd261 EB |
4843 | /* If this is an enumeration or floating-point type, we were not able to set |
4844 | the bounds since they refer to the type. These are always static. */ | |
a1ab4c31 AC |
4845 | if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity))) |
4846 | || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity))) | |
4847 | { | |
4848 | tree gnu_scalar_type = gnu_type; | |
84fb43a1 | 4849 | tree gnu_low_bound, gnu_high_bound; |
a1ab4c31 AC |
4850 | |
4851 | /* If this is a padded type, we need to use the underlying type. */ | |
315cff15 | 4852 | if (TYPE_IS_PADDING_P (gnu_scalar_type)) |
a1ab4c31 AC |
4853 | gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type)); |
4854 | ||
4855 | /* If this is a floating point type and we haven't set a floating | |
4856 | point type yet, use this in the evaluation of the bounds. */ | |
4857 | if (!longest_float_type_node && kind == E_Floating_Point_Type) | |
c1abd261 | 4858 | longest_float_type_node = gnu_scalar_type; |
a1ab4c31 | 4859 | |
84fb43a1 EB |
4860 | gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity)); |
4861 | gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity)); | |
a1ab4c31 | 4862 | |
c1abd261 | 4863 | if (kind == E_Enumeration_Type) |
a1ab4c31 | 4864 | { |
84fb43a1 EB |
4865 | /* Enumeration types have specific RM bounds. */ |
4866 | SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound); | |
4867 | SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound); | |
4868 | ||
4869 | /* Write full debugging information. Since this has both a | |
4870 | typedef and a tag, avoid outputting the name twice. */ | |
a1ab4c31 AC |
4871 | DECL_ARTIFICIAL (gnu_decl) = 1; |
4872 | rest_of_type_decl_compilation (gnu_decl); | |
4873 | } | |
84fb43a1 EB |
4874 | |
4875 | else | |
4876 | { | |
4877 | /* Floating-point types don't have specific RM bounds. */ | |
4878 | TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound; | |
4879 | TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound; | |
4880 | } | |
a1ab4c31 AC |
4881 | } |
4882 | ||
4883 | /* If we deferred processing of incomplete types, re-enable it. If there | |
4884 | were no other disables and we have some to process, do so. */ | |
4885 | if (this_deferred && --defer_incomplete_level == 0) | |
4886 | { | |
4887 | if (defer_incomplete_list) | |
4888 | { | |
4889 | struct incomplete *incp, *next; | |
4890 | ||
4891 | /* We are back to level 0 for the deferring of incomplete types. | |
4892 | But processing these incomplete types below may itself require | |
4893 | deferring, so preserve what we have and restart from scratch. */ | |
4894 | incp = defer_incomplete_list; | |
4895 | defer_incomplete_list = NULL; | |
4896 | ||
4897 | /* For finalization, however, all types must be complete so we | |
4898 | cannot do the same because deferred incomplete types may end up | |
4899 | referencing each other. Process them all recursively first. */ | |
4900 | defer_finalize_level++; | |
4901 | ||
4902 | for (; incp; incp = next) | |
4903 | { | |
4904 | next = incp->next; | |
4905 | ||
4906 | if (incp->old_type) | |
4907 | update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type), | |
4908 | gnat_to_gnu_type (incp->full_type)); | |
4909 | free (incp); | |
4910 | } | |
4911 | ||
4912 | defer_finalize_level--; | |
4913 | } | |
4914 | ||
4915 | /* All the deferred incomplete types have been processed so we can | |
4916 | now proceed with the finalization of the deferred types. */ | |
4917 | if (defer_finalize_level == 0 && defer_finalize_list) | |
4918 | { | |
4919 | unsigned int i; | |
4920 | tree t; | |
4921 | ||
4922 | for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++) | |
4923 | rest_of_type_decl_compilation_no_defer (t); | |
4924 | ||
4925 | VEC_free (tree, heap, defer_finalize_list); | |
4926 | } | |
4927 | } | |
4928 | ||
4929 | /* If we are not defining this type, see if it's in the incomplete list. | |
4930 | If so, handle that list entry now. */ | |
4931 | else if (!definition) | |
4932 | { | |
4933 | struct incomplete *incp; | |
4934 | ||
4935 | for (incp = defer_incomplete_list; incp; incp = incp->next) | |
4936 | if (incp->old_type && incp->full_type == gnat_entity) | |
4937 | { | |
4938 | update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type), | |
4939 | TREE_TYPE (gnu_decl)); | |
4940 | incp->old_type = NULL_TREE; | |
4941 | } | |
4942 | } | |
4943 | ||
4944 | if (this_global) | |
4945 | force_global--; | |
4946 | ||
b4680ca1 EB |
4947 | /* If this is a packed array type whose original array type is itself |
4948 | an Itype without freeze node, make sure the latter is processed. */ | |
a1ab4c31 | 4949 | if (Is_Packed_Array_Type (gnat_entity) |
b4680ca1 EB |
4950 | && Is_Itype (Original_Array_Type (gnat_entity)) |
4951 | && No (Freeze_Node (Original_Array_Type (gnat_entity))) | |
4952 | && !present_gnu_tree (Original_Array_Type (gnat_entity))) | |
4953 | gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0); | |
a1ab4c31 AC |
4954 | |
4955 | return gnu_decl; | |
4956 | } | |
4957 | ||
4958 | /* Similar, but if the returned value is a COMPONENT_REF, return the | |
4959 | FIELD_DECL. */ | |
4960 | ||
4961 | tree | |
4962 | gnat_to_gnu_field_decl (Entity_Id gnat_entity) | |
4963 | { | |
4964 | tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); | |
4965 | ||
4966 | if (TREE_CODE (gnu_field) == COMPONENT_REF) | |
4967 | gnu_field = TREE_OPERAND (gnu_field, 1); | |
4968 | ||
4969 | return gnu_field; | |
4970 | } | |
4971 | ||
229077b0 EB |
4972 | /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return |
4973 | the GCC type corresponding to that entity. */ | |
4974 | ||
4975 | tree | |
4976 | gnat_to_gnu_type (Entity_Id gnat_entity) | |
4977 | { | |
4978 | tree gnu_decl; | |
4979 | ||
4980 | /* The back end never attempts to annotate generic types. */ | |
4981 | if (Is_Generic_Type (gnat_entity) && type_annotate_only) | |
4982 | return void_type_node; | |
4983 | ||
4984 | gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); | |
4985 | gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL); | |
4986 | ||
4987 | return TREE_TYPE (gnu_decl); | |
4988 | } | |
4989 | ||
4990 | /* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return | |
4991 | the unpadded version of the GCC type corresponding to that entity. */ | |
4992 | ||
4993 | tree | |
4994 | get_unpadded_type (Entity_Id gnat_entity) | |
4995 | { | |
4996 | tree type = gnat_to_gnu_type (gnat_entity); | |
4997 | ||
315cff15 | 4998 | if (TYPE_IS_PADDING_P (type)) |
229077b0 EB |
4999 | type = TREE_TYPE (TYPE_FIELDS (type)); |
5000 | ||
5001 | return type; | |
5002 | } | |
5003 | \f | |
a1ab4c31 AC |
5004 | /* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it. |
5005 | Every TYPE_DECL generated for a type definition must be passed | |
5006 | to this function once everything else has been done for it. */ | |
5007 | ||
5008 | void | |
5009 | rest_of_type_decl_compilation (tree decl) | |
5010 | { | |
5011 | /* We need to defer finalizing the type if incomplete types | |
5012 | are being deferred or if they are being processed. */ | |
5013 | if (defer_incomplete_level || defer_finalize_level) | |
5014 | VEC_safe_push (tree, heap, defer_finalize_list, decl); | |
5015 | else | |
5016 | rest_of_type_decl_compilation_no_defer (decl); | |
5017 | } | |
5018 | ||
5019 | /* Same as above but without deferring the compilation. This | |
5020 | function should not be invoked directly on a TYPE_DECL. */ | |
5021 | ||
5022 | static void | |
5023 | rest_of_type_decl_compilation_no_defer (tree decl) | |
5024 | { | |
5025 | const int toplev = global_bindings_p (); | |
5026 | tree t = TREE_TYPE (decl); | |
5027 | ||
5028 | rest_of_decl_compilation (decl, toplev, 0); | |
5029 | ||
5030 | /* Now process all the variants. This is needed for STABS. */ | |
5031 | for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t)) | |
5032 | { | |
5033 | if (t == TREE_TYPE (decl)) | |
5034 | continue; | |
5035 | ||
5036 | if (!TYPE_STUB_DECL (t)) | |
10069d53 | 5037 | TYPE_STUB_DECL (t) = create_type_stub_decl (DECL_NAME (decl), t); |
a1ab4c31 AC |
5038 | |
5039 | rest_of_type_compilation (t, toplev); | |
5040 | } | |
5041 | } | |
5042 | ||
5043 | /* Finalize any From_With_Type incomplete types. We do this after processing | |
5044 | our compilation unit and after processing its spec, if this is a body. */ | |
5045 | ||
5046 | void | |
5047 | finalize_from_with_types (void) | |
5048 | { | |
5049 | struct incomplete *incp = defer_limited_with; | |
5050 | struct incomplete *next; | |
5051 | ||
5052 | defer_limited_with = 0; | |
5053 | for (; incp; incp = next) | |
5054 | { | |
5055 | next = incp->next; | |
5056 | ||
5057 | if (incp->old_type != 0) | |
5058 | update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type), | |
5059 | gnat_to_gnu_type (incp->full_type)); | |
5060 | free (incp); | |
5061 | } | |
5062 | } | |
5063 | ||
5064 | /* Return the equivalent type to be used for GNAT_ENTITY, if it's a | |
5065 | kind of type (such E_Task_Type) that has a different type which Gigi | |
5066 | uses for its representation. If the type does not have a special type | |
5067 | for its representation, return GNAT_ENTITY. If a type is supposed to | |
5068 | exist, but does not, abort unless annotating types, in which case | |
5069 | return Empty. If GNAT_ENTITY is Empty, return Empty. */ | |
5070 | ||
5071 | Entity_Id | |
5072 | Gigi_Equivalent_Type (Entity_Id gnat_entity) | |
5073 | { | |
5074 | Entity_Id gnat_equiv = gnat_entity; | |
5075 | ||
5076 | if (No (gnat_entity)) | |
5077 | return gnat_entity; | |
5078 | ||
5079 | switch (Ekind (gnat_entity)) | |
5080 | { | |
5081 | case E_Class_Wide_Subtype: | |
5082 | if (Present (Equivalent_Type (gnat_entity))) | |
5083 | gnat_equiv = Equivalent_Type (gnat_entity); | |
5084 | break; | |
5085 | ||
5086 | case E_Access_Protected_Subprogram_Type: | |
5087 | case E_Anonymous_Access_Protected_Subprogram_Type: | |
5088 | gnat_equiv = Equivalent_Type (gnat_entity); | |
5089 | break; | |
5090 | ||
5091 | case E_Class_Wide_Type: | |
cbae498b | 5092 | gnat_equiv = Root_Type (gnat_entity); |
a1ab4c31 AC |
5093 | break; |
5094 | ||
5095 | case E_Task_Type: | |
5096 | case E_Task_Subtype: | |
5097 | case E_Protected_Type: | |
5098 | case E_Protected_Subtype: | |
5099 | gnat_equiv = Corresponding_Record_Type (gnat_entity); | |
5100 | break; | |
5101 | ||
5102 | default: | |
5103 | break; | |
5104 | } | |
5105 | ||
5106 | gcc_assert (Present (gnat_equiv) || type_annotate_only); | |
5107 | return gnat_equiv; | |
5108 | } | |
5109 | ||
2cac6017 EB |
5110 | /* Return a GCC tree for a type corresponding to the component type of the |
5111 | array type or subtype GNAT_ARRAY. DEFINITION is true if this component | |
5112 | is for an array being defined. DEBUG_INFO_P is true if we need to write | |
5113 | debug information for other types that we may create in the process. */ | |
5114 | ||
5115 | static tree | |
5116 | gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition, | |
5117 | bool debug_info_p) | |
5118 | { | |
5119 | tree gnu_type = gnat_to_gnu_type (Component_Type (gnat_array)); | |
5120 | tree gnu_comp_size; | |
5121 | ||
5122 | /* Try to get a smaller form of the component if needed. */ | |
5123 | if ((Is_Packed (gnat_array) | |
5124 | || Has_Component_Size_Clause (gnat_array)) | |
5125 | && !Is_Bit_Packed_Array (gnat_array) | |
5126 | && !Has_Aliased_Components (gnat_array) | |
5127 | && !Strict_Alignment (Component_Type (gnat_array)) | |
5128 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
315cff15 | 5129 | && !TYPE_FAT_POINTER_P (gnu_type) |
2cac6017 EB |
5130 | && host_integerp (TYPE_SIZE (gnu_type), 1)) |
5131 | gnu_type = make_packable_type (gnu_type, false); | |
5132 | ||
5133 | if (Has_Atomic_Components (gnat_array)) | |
5134 | check_ok_for_atomic (gnu_type, gnat_array, true); | |
5135 | ||
5136 | /* Get and validate any specified Component_Size. */ | |
5137 | gnu_comp_size | |
5138 | = validate_size (Component_Size (gnat_array), gnu_type, gnat_array, | |
5139 | Is_Bit_Packed_Array (gnat_array) ? TYPE_DECL : VAR_DECL, | |
5140 | true, Has_Component_Size_Clause (gnat_array)); | |
5141 | ||
1aa8b1dd EB |
5142 | /* If the array has aliased components and the component size can be zero, |
5143 | force at least unit size to ensure that the components have distinct | |
5144 | addresses. */ | |
5145 | if (!gnu_comp_size | |
5146 | && Has_Aliased_Components (gnat_array) | |
5147 | && (integer_zerop (TYPE_SIZE (gnu_type)) | |
5148 | || (TREE_CODE (gnu_type) == ARRAY_TYPE | |
5149 | && !TREE_CONSTANT (TYPE_SIZE (gnu_type))))) | |
5150 | gnu_comp_size | |
5151 | = size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node); | |
5152 | ||
2cac6017 EB |
5153 | /* If the component type is a RECORD_TYPE that has a self-referential size, |
5154 | then use the maximum size for the component size. */ | |
5155 | if (!gnu_comp_size | |
5156 | && TREE_CODE (gnu_type) == RECORD_TYPE | |
5157 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) | |
5158 | gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true); | |
5159 | ||
5160 | /* Honor the component size. This is not needed for bit-packed arrays. */ | |
5161 | if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array)) | |
5162 | { | |
5163 | tree orig_type = gnu_type; | |
5164 | unsigned int max_align; | |
5165 | ||
5166 | /* If an alignment is specified, use it as a cap on the component type | |
5167 | so that it can be honored for the whole type. But ignore it for the | |
5168 | original type of packed array types. */ | |
5169 | if (No (Packed_Array_Type (gnat_array)) && Known_Alignment (gnat_array)) | |
5170 | max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0); | |
5171 | else | |
5172 | max_align = 0; | |
5173 | ||
5174 | gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false); | |
5175 | if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align) | |
5176 | gnu_type = orig_type; | |
5177 | else | |
5178 | orig_type = gnu_type; | |
5179 | ||
5180 | gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array, | |
afb4afcd | 5181 | true, false, definition, true); |
2cac6017 EB |
5182 | |
5183 | /* If a padding record was made, declare it now since it will never be | |
5184 | declared otherwise. This is necessary to ensure that its subtrees | |
5185 | are properly marked. */ | |
5186 | if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) | |
5187 | create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true, | |
5188 | debug_info_p, gnat_array); | |
5189 | } | |
5190 | ||
5191 | if (Has_Volatile_Components (Base_Type (gnat_array))) | |
5192 | gnu_type | |
5193 | = build_qualified_type (gnu_type, | |
5194 | TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE); | |
5195 | ||
5196 | return gnu_type; | |
5197 | } | |
5198 | ||
a1ab4c31 AC |
5199 | /* Return a GCC tree for a parameter corresponding to GNAT_PARAM and |
5200 | using MECH as its passing mechanism, to be placed in the parameter | |
5201 | list built for GNAT_SUBPROG. Assume a foreign convention for the | |
5202 | latter if FOREIGN is true. Also set CICO to true if the parameter | |
5203 | must use the copy-in copy-out implementation mechanism. | |
5204 | ||
5205 | The returned tree is a PARM_DECL, except for those cases where no | |
5206 | parameter needs to be actually passed to the subprogram; the type | |
5207 | of this "shadow" parameter is then returned instead. */ | |
5208 | ||
5209 | static tree | |
5210 | gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech, | |
5211 | Entity_Id gnat_subprog, bool foreign, bool *cico) | |
5212 | { | |
5213 | tree gnu_param_name = get_entity_name (gnat_param); | |
5214 | tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param)); | |
6ca2b0a0 | 5215 | tree gnu_param_type_alt = NULL_TREE; |
a1ab4c31 AC |
5216 | bool in_param = (Ekind (gnat_param) == E_In_Parameter); |
5217 | /* The parameter can be indirectly modified if its address is taken. */ | |
5218 | bool ro_param = in_param && !Address_Taken (gnat_param); | |
5219 | bool by_return = false, by_component_ptr = false, by_ref = false; | |
5220 | tree gnu_param; | |
5221 | ||
5222 | /* Copy-return is used only for the first parameter of a valued procedure. | |
5223 | It's a copy mechanism for which a parameter is never allocated. */ | |
5224 | if (mech == By_Copy_Return) | |
5225 | { | |
5226 | gcc_assert (Ekind (gnat_param) == E_Out_Parameter); | |
5227 | mech = By_Copy; | |
5228 | by_return = true; | |
5229 | } | |
5230 | ||
5231 | /* If this is either a foreign function or if the underlying type won't | |
5232 | be passed by reference, strip off possible padding type. */ | |
315cff15 | 5233 | if (TYPE_IS_PADDING_P (gnu_param_type)) |
a1ab4c31 AC |
5234 | { |
5235 | tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type)); | |
5236 | ||
5237 | if (mech == By_Reference | |
5238 | || foreign | |
5239 | || (!must_pass_by_ref (unpadded_type) | |
5240 | && (mech == By_Copy || !default_pass_by_ref (unpadded_type)))) | |
5241 | gnu_param_type = unpadded_type; | |
5242 | } | |
5243 | ||
5244 | /* If this is a read-only parameter, make a variant of the type that is | |
5245 | read-only. ??? However, if this is an unconstrained array, that type | |
5246 | can be very complex, so skip it for now. Likewise for any other | |
5247 | self-referential type. */ | |
5248 | if (ro_param | |
5249 | && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE | |
5250 | && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type))) | |
5251 | gnu_param_type = build_qualified_type (gnu_param_type, | |
5252 | (TYPE_QUALS (gnu_param_type) | |
5253 | | TYPE_QUAL_CONST)); | |
5254 | ||
5255 | /* For foreign conventions, pass arrays as pointers to the element type. | |
5256 | First check for unconstrained array and get the underlying array. */ | |
5257 | if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE) | |
5258 | gnu_param_type | |
5259 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type)))); | |
5260 | ||
2503cb81 OH |
5261 | /* For GCC builtins, pass Address integer types as (void *) */ |
5262 | if (Convention (gnat_subprog) == Convention_Intrinsic | |
5263 | && Present (Interface_Name (gnat_subprog)) | |
5264 | && Is_Descendent_Of_Address (Etype (gnat_param))) | |
5265 | gnu_param_type = ptr_void_type_node; | |
5266 | ||
a981c964 | 5267 | /* VMS descriptors are themselves passed by reference. */ |
f0a631aa DR |
5268 | if (mech == By_Short_Descriptor || |
5269 | (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_MALLOC64)) | |
5270 | gnu_param_type | |
5271 | = build_pointer_type (build_vms_descriptor32 (gnu_param_type, | |
5272 | Mechanism (gnat_param), | |
5273 | gnat_subprog)); | |
5274 | else if (mech == By_Descriptor) | |
6ca2b0a0 | 5275 | { |
a981c964 EB |
5276 | /* Build both a 32-bit and 64-bit descriptor, one of which will be |
5277 | chosen in fill_vms_descriptor. */ | |
6ca2b0a0 | 5278 | gnu_param_type_alt |
d628c015 | 5279 | = build_pointer_type (build_vms_descriptor32 (gnu_param_type, |
6ca2b0a0 DR |
5280 | Mechanism (gnat_param), |
5281 | gnat_subprog)); | |
5282 | gnu_param_type | |
5283 | = build_pointer_type (build_vms_descriptor (gnu_param_type, | |
5284 | Mechanism (gnat_param), | |
5285 | gnat_subprog)); | |
5286 | } | |
a1ab4c31 AC |
5287 | |
5288 | /* Arrays are passed as pointers to element type for foreign conventions. */ | |
5289 | else if (foreign | |
5290 | && mech != By_Copy | |
5291 | && TREE_CODE (gnu_param_type) == ARRAY_TYPE) | |
5292 | { | |
5293 | /* Strip off any multi-dimensional entries, then strip | |
5294 | off the last array to get the component type. */ | |
5295 | while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE | |
5296 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type))) | |
5297 | gnu_param_type = TREE_TYPE (gnu_param_type); | |
5298 | ||
5299 | by_component_ptr = true; | |
5300 | gnu_param_type = TREE_TYPE (gnu_param_type); | |
5301 | ||
5302 | if (ro_param) | |
5303 | gnu_param_type = build_qualified_type (gnu_param_type, | |
5304 | (TYPE_QUALS (gnu_param_type) | |
5305 | | TYPE_QUAL_CONST)); | |
5306 | ||
5307 | gnu_param_type = build_pointer_type (gnu_param_type); | |
5308 | } | |
5309 | ||
5310 | /* Fat pointers are passed as thin pointers for foreign conventions. */ | |
315cff15 | 5311 | else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type)) |
a1ab4c31 AC |
5312 | gnu_param_type |
5313 | = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0); | |
5314 | ||
5315 | /* If we must pass or were requested to pass by reference, do so. | |
5316 | If we were requested to pass by copy, do so. | |
5317 | Otherwise, for foreign conventions, pass In Out or Out parameters | |
5318 | or aggregates by reference. For COBOL and Fortran, pass all | |
5319 | integer and FP types that way too. For Convention Ada, use | |
5320 | the standard Ada default. */ | |
5321 | else if (must_pass_by_ref (gnu_param_type) | |
5322 | || mech == By_Reference | |
5323 | || (mech != By_Copy | |
5324 | && ((foreign | |
5325 | && (!in_param || AGGREGATE_TYPE_P (gnu_param_type))) | |
5326 | || (foreign | |
5327 | && (Convention (gnat_subprog) == Convention_Fortran | |
5328 | || Convention (gnat_subprog) == Convention_COBOL) | |
5329 | && (INTEGRAL_TYPE_P (gnu_param_type) | |
5330 | || FLOAT_TYPE_P (gnu_param_type))) | |
5331 | || (!foreign | |
5332 | && default_pass_by_ref (gnu_param_type))))) | |
5333 | { | |
5334 | gnu_param_type = build_reference_type (gnu_param_type); | |
5335 | by_ref = true; | |
5336 | } | |
5337 | ||
5338 | /* Pass In Out or Out parameters using copy-in copy-out mechanism. */ | |
5339 | else if (!in_param) | |
5340 | *cico = true; | |
5341 | ||
5342 | if (mech == By_Copy && (by_ref || by_component_ptr)) | |
5343 | post_error ("?cannot pass & by copy", gnat_param); | |
5344 | ||
5345 | /* If this is an Out parameter that isn't passed by reference and isn't | |
5346 | a pointer or aggregate, we don't make a PARM_DECL for it. Instead, | |
5347 | it will be a VAR_DECL created when we process the procedure, so just | |
5348 | return its type. For the special parameter of a valued procedure, | |
5349 | never pass it in. | |
5350 | ||
5351 | An exception is made to cover the RM-6.4.1 rule requiring "by copy" | |
5352 | Out parameters with discriminants or implicit initial values to be | |
5353 | handled like In Out parameters. These type are normally built as | |
5354 | aggregates, hence passed by reference, except for some packed arrays | |
5355 | which end up encoded in special integer types. | |
5356 | ||
5357 | The exception we need to make is then for packed arrays of records | |
5358 | with discriminants or implicit initial values. We have no light/easy | |
5359 | way to check for the latter case, so we merely check for packed arrays | |
5360 | of records. This may lead to useless copy-in operations, but in very | |
5361 | rare cases only, as these would be exceptions in a set of already | |
5362 | exceptional situations. */ | |
5363 | if (Ekind (gnat_param) == E_Out_Parameter | |
5364 | && !by_ref | |
5365 | && (by_return | |
5366 | || (mech != By_Descriptor | |
d628c015 | 5367 | && mech != By_Short_Descriptor |
a1ab4c31 AC |
5368 | && !POINTER_TYPE_P (gnu_param_type) |
5369 | && !AGGREGATE_TYPE_P (gnu_param_type))) | |
5370 | && !(Is_Array_Type (Etype (gnat_param)) | |
5371 | && Is_Packed (Etype (gnat_param)) | |
5372 | && Is_Composite_Type (Component_Type (Etype (gnat_param))))) | |
5373 | return gnu_param_type; | |
5374 | ||
5375 | gnu_param = create_param_decl (gnu_param_name, gnu_param_type, | |
5376 | ro_param || by_ref || by_component_ptr); | |
5377 | DECL_BY_REF_P (gnu_param) = by_ref; | |
5378 | DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr; | |
d628c015 DR |
5379 | DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor || |
5380 | mech == By_Short_Descriptor); | |
a1ab4c31 AC |
5381 | DECL_POINTS_TO_READONLY_P (gnu_param) |
5382 | = (ro_param && (by_ref || by_component_ptr)); | |
5383 | ||
a981c964 EB |
5384 | /* Save the alternate descriptor type, if any. */ |
5385 | if (gnu_param_type_alt) | |
5386 | SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt); | |
6ca2b0a0 | 5387 | |
a1ab4c31 AC |
5388 | /* If no Mechanism was specified, indicate what we're using, then |
5389 | back-annotate it. */ | |
5390 | if (mech == Default) | |
5391 | mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy; | |
5392 | ||
5393 | Set_Mechanism (gnat_param, mech); | |
5394 | return gnu_param; | |
5395 | } | |
5396 | ||
5397 | /* Return true if DISCR1 and DISCR2 represent the same discriminant. */ | |
5398 | ||
5399 | static bool | |
5400 | same_discriminant_p (Entity_Id discr1, Entity_Id discr2) | |
5401 | { | |
5402 | while (Present (Corresponding_Discriminant (discr1))) | |
5403 | discr1 = Corresponding_Discriminant (discr1); | |
5404 | ||
5405 | while (Present (Corresponding_Discriminant (discr2))) | |
5406 | discr2 = Corresponding_Discriminant (discr2); | |
5407 | ||
5408 | return | |
5409 | Original_Record_Component (discr1) == Original_Record_Component (discr2); | |
5410 | } | |
5411 | ||
d8e94f79 EB |
5412 | /* Return true if the array type GNU_TYPE, which represents a dimension of |
5413 | GNAT_TYPE, has a non-aliased component in the back-end sense. */ | |
a1ab4c31 AC |
5414 | |
5415 | static bool | |
d8e94f79 | 5416 | array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type) |
a1ab4c31 | 5417 | { |
d8e94f79 EB |
5418 | /* If the array type is not the innermost dimension of the GNAT type, |
5419 | then it has a non-aliased component. */ | |
a1ab4c31 AC |
5420 | if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE |
5421 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) | |
5422 | return true; | |
5423 | ||
d8e94f79 EB |
5424 | /* If the array type has an aliased component in the front-end sense, |
5425 | then it also has an aliased component in the back-end sense. */ | |
a1ab4c31 AC |
5426 | if (Has_Aliased_Components (gnat_type)) |
5427 | return false; | |
5428 | ||
d8e94f79 EB |
5429 | /* If this is a derived type, then it has a non-aliased component if |
5430 | and only if its parent type also has one. */ | |
5431 | if (Is_Derived_Type (gnat_type)) | |
5432 | { | |
5433 | tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type)); | |
5434 | int index; | |
5435 | if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE) | |
5436 | gnu_parent_type | |
5437 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type)))); | |
5438 | for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--) | |
5439 | gnu_parent_type = TREE_TYPE (gnu_parent_type); | |
5440 | return TYPE_NONALIASED_COMPONENT (gnu_parent_type); | |
5441 | } | |
5442 | ||
5443 | /* Otherwise, rely exclusively on properties of the element type. */ | |
a1ab4c31 AC |
5444 | return type_for_nonaliased_component_p (TREE_TYPE (gnu_type)); |
5445 | } | |
229077b0 EB |
5446 | |
5447 | /* Return true if GNAT_ADDRESS is a value known at compile-time. */ | |
5448 | ||
5449 | static bool | |
5450 | compile_time_known_address_p (Node_Id gnat_address) | |
5451 | { | |
5452 | /* Catch System'To_Address. */ | |
5453 | if (Nkind (gnat_address) == N_Unchecked_Type_Conversion) | |
5454 | gnat_address = Expression (gnat_address); | |
5455 | ||
5456 | return Compile_Time_Known_Value (gnat_address); | |
5457 | } | |
f45f9664 | 5458 | |
58c8f770 EB |
5459 | /* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e. if the |
5460 | inequality HB >= LB-1 is true. LB and HB are the low and high bounds. */ | |
f45f9664 EB |
5461 | |
5462 | static bool | |
5463 | cannot_be_superflat_p (Node_Id gnat_range) | |
5464 | { | |
5465 | Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range); | |
683ebd75 | 5466 | Node_Id scalar_range; |
1081f5a7 | 5467 | tree gnu_lb, gnu_hb, gnu_lb_minus_one; |
f45f9664 EB |
5468 | |
5469 | /* If the low bound is not constant, try to find an upper bound. */ | |
5470 | while (Nkind (gnat_lb) != N_Integer_Literal | |
5471 | && (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype | |
5472 | || Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype) | |
683ebd75 OH |
5473 | && (scalar_range = Scalar_Range (Etype (gnat_lb))) |
5474 | && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition | |
5475 | || Nkind (scalar_range) == N_Range)) | |
5476 | gnat_lb = High_Bound (scalar_range); | |
f45f9664 EB |
5477 | |
5478 | /* If the high bound is not constant, try to find a lower bound. */ | |
5479 | while (Nkind (gnat_hb) != N_Integer_Literal | |
5480 | && (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype | |
5481 | || Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype) | |
683ebd75 OH |
5482 | && (scalar_range = Scalar_Range (Etype (gnat_hb))) |
5483 | && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition | |
5484 | || Nkind (scalar_range) == N_Range)) | |
5485 | gnat_hb = Low_Bound (scalar_range); | |
f45f9664 | 5486 | |
1081f5a7 EB |
5487 | /* If we have failed to find constant bounds, punt. */ |
5488 | if (Nkind (gnat_lb) != N_Integer_Literal | |
5489 | || Nkind (gnat_hb) != N_Integer_Literal) | |
f45f9664 EB |
5490 | return false; |
5491 | ||
1081f5a7 EB |
5492 | /* We need at least a signed 64-bit type to catch most cases. */ |
5493 | gnu_lb = UI_To_gnu (Intval (gnat_lb), sbitsizetype); | |
5494 | gnu_hb = UI_To_gnu (Intval (gnat_hb), sbitsizetype); | |
5495 | if (TREE_OVERFLOW (gnu_lb) || TREE_OVERFLOW (gnu_hb)) | |
5496 | return false; | |
f45f9664 EB |
5497 | |
5498 | /* If the low bound is the smallest integer, nothing can be smaller. */ | |
1081f5a7 EB |
5499 | gnu_lb_minus_one = size_binop (MINUS_EXPR, gnu_lb, sbitsize_one_node); |
5500 | if (TREE_OVERFLOW (gnu_lb_minus_one)) | |
f45f9664 EB |
5501 | return true; |
5502 | ||
1081f5a7 | 5503 | return !tree_int_cst_lt (gnu_hb, gnu_lb_minus_one); |
f45f9664 | 5504 | } |
cb3d597d EB |
5505 | |
5506 | /* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */ | |
5507 | ||
5508 | static bool | |
5509 | constructor_address_p (tree gnu_expr) | |
5510 | { | |
5511 | while (TREE_CODE (gnu_expr) == NOP_EXPR | |
5512 | || TREE_CODE (gnu_expr) == CONVERT_EXPR | |
5513 | || TREE_CODE (gnu_expr) == NON_LVALUE_EXPR) | |
5514 | gnu_expr = TREE_OPERAND (gnu_expr, 0); | |
5515 | ||
5516 | return (TREE_CODE (gnu_expr) == ADDR_EXPR | |
5517 | && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR); | |
5518 | } | |
a1ab4c31 AC |
5519 | \f |
5520 | /* Given GNAT_ENTITY, elaborate all expressions that are required to | |
5521 | be elaborated at the point of its definition, but do nothing else. */ | |
5522 | ||
5523 | void | |
5524 | elaborate_entity (Entity_Id gnat_entity) | |
5525 | { | |
5526 | switch (Ekind (gnat_entity)) | |
5527 | { | |
5528 | case E_Signed_Integer_Subtype: | |
5529 | case E_Modular_Integer_Subtype: | |
5530 | case E_Enumeration_Subtype: | |
5531 | case E_Ordinary_Fixed_Point_Subtype: | |
5532 | case E_Decimal_Fixed_Point_Subtype: | |
5533 | case E_Floating_Point_Subtype: | |
5534 | { | |
5535 | Node_Id gnat_lb = Type_Low_Bound (gnat_entity); | |
5536 | Node_Id gnat_hb = Type_High_Bound (gnat_entity); | |
5537 | ||
c1abd261 EB |
5538 | /* ??? Tests to avoid Constraint_Error in static expressions |
5539 | are needed until after the front stops generating bogus | |
5540 | conversions on bounds of real types. */ | |
a1ab4c31 AC |
5541 | if (!Raises_Constraint_Error (gnat_lb)) |
5542 | elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"), | |
a531043b | 5543 | true, false, Needs_Debug_Info (gnat_entity)); |
a1ab4c31 AC |
5544 | if (!Raises_Constraint_Error (gnat_hb)) |
5545 | elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"), | |
a531043b | 5546 | true, false, Needs_Debug_Info (gnat_entity)); |
a1ab4c31 AC |
5547 | break; |
5548 | } | |
5549 | ||
5550 | case E_Record_Type: | |
5551 | { | |
5552 | Node_Id full_definition = Declaration_Node (gnat_entity); | |
5553 | Node_Id record_definition = Type_Definition (full_definition); | |
5554 | ||
5555 | /* If this is a record extension, go a level further to find the | |
5556 | record definition. */ | |
5557 | if (Nkind (record_definition) == N_Derived_Type_Definition) | |
5558 | record_definition = Record_Extension_Part (record_definition); | |
5559 | } | |
5560 | break; | |
5561 | ||
5562 | case E_Record_Subtype: | |
5563 | case E_Private_Subtype: | |
5564 | case E_Limited_Private_Subtype: | |
5565 | case E_Record_Subtype_With_Private: | |
5566 | if (Is_Constrained (gnat_entity) | |
8cd28148 | 5567 | && Has_Discriminants (gnat_entity) |
a1ab4c31 AC |
5568 | && Present (Discriminant_Constraint (gnat_entity))) |
5569 | { | |
5570 | Node_Id gnat_discriminant_expr; | |
5571 | Entity_Id gnat_field; | |
5572 | ||
8cd28148 EB |
5573 | for (gnat_field |
5574 | = First_Discriminant (Implementation_Base_Type (gnat_entity)), | |
a1ab4c31 AC |
5575 | gnat_discriminant_expr |
5576 | = First_Elmt (Discriminant_Constraint (gnat_entity)); | |
5577 | Present (gnat_field); | |
5578 | gnat_field = Next_Discriminant (gnat_field), | |
5579 | gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr)) | |
5580 | /* ??? For now, ignore access discriminants. */ | |
5581 | if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr)))) | |
5582 | elaborate_expression (Node (gnat_discriminant_expr), | |
a531043b EB |
5583 | gnat_entity, get_entity_name (gnat_field), |
5584 | true, false, false); | |
a1ab4c31 AC |
5585 | } |
5586 | break; | |
5587 | ||
5588 | } | |
5589 | } | |
5590 | \f | |
5591 | /* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark | |
5592 | any entities on its entity chain similarly. */ | |
5593 | ||
5594 | void | |
5595 | mark_out_of_scope (Entity_Id gnat_entity) | |
5596 | { | |
5597 | Entity_Id gnat_sub_entity; | |
5598 | unsigned int kind = Ekind (gnat_entity); | |
5599 | ||
5600 | /* If this has an entity list, process all in the list. */ | |
5601 | if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind) | |
5602 | || IN (kind, Private_Kind) | |
5603 | || kind == E_Block || kind == E_Entry || kind == E_Entry_Family | |
5604 | || kind == E_Function || kind == E_Generic_Function | |
5605 | || kind == E_Generic_Package || kind == E_Generic_Procedure | |
5606 | || kind == E_Loop || kind == E_Operator || kind == E_Package | |
5607 | || kind == E_Package_Body || kind == E_Procedure | |
5608 | || kind == E_Record_Type || kind == E_Record_Subtype | |
5609 | || kind == E_Subprogram_Body || kind == E_Subprogram_Type) | |
5610 | for (gnat_sub_entity = First_Entity (gnat_entity); | |
5611 | Present (gnat_sub_entity); | |
5612 | gnat_sub_entity = Next_Entity (gnat_sub_entity)) | |
5613 | if (Scope (gnat_sub_entity) == gnat_entity | |
5614 | && gnat_sub_entity != gnat_entity) | |
5615 | mark_out_of_scope (gnat_sub_entity); | |
5616 | ||
5617 | /* Now clear this if it has been defined, but only do so if it isn't | |
5618 | a subprogram or parameter. We could refine this, but it isn't | |
5619 | worth it. If this is statically allocated, it is supposed to | |
5620 | hang around out of cope. */ | |
5621 | if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity) | |
5622 | && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind)) | |
5623 | { | |
5624 | save_gnu_tree (gnat_entity, NULL_TREE, true); | |
5625 | save_gnu_tree (gnat_entity, error_mark_node, true); | |
5626 | } | |
5627 | } | |
5628 | \f | |
794511d2 EB |
5629 | /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP. |
5630 | If this is a multi-dimensional array type, do this recursively. | |
5631 | ||
5632 | OP may be | |
5633 | - ALIAS_SET_COPY: the new set is made a copy of the old one. | |
5634 | - ALIAS_SET_SUPERSET: the new set is made a superset of the old one. | |
5635 | - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */ | |
a1ab4c31 AC |
5636 | |
5637 | static void | |
794511d2 | 5638 | relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op) |
a1ab4c31 AC |
5639 | { |
5640 | /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case | |
5641 | of a one-dimensional array, since the padding has the same alias set | |
5642 | as the field type, but if it's a multi-dimensional array, we need to | |
5643 | see the inner types. */ | |
5644 | while (TREE_CODE (gnu_old_type) == RECORD_TYPE | |
5645 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type) | |
315cff15 | 5646 | || TYPE_PADDING_P (gnu_old_type))) |
a1ab4c31 AC |
5647 | gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type)); |
5648 | ||
794511d2 EB |
5649 | /* Unconstrained array types are deemed incomplete and would thus be given |
5650 | alias set 0. Retrieve the underlying array type. */ | |
a1ab4c31 AC |
5651 | if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE) |
5652 | gnu_old_type | |
5653 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type)))); | |
794511d2 EB |
5654 | if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE) |
5655 | gnu_new_type | |
5656 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type)))); | |
a1ab4c31 AC |
5657 | |
5658 | if (TREE_CODE (gnu_new_type) == ARRAY_TYPE | |
5659 | && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE | |
5660 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type))) | |
794511d2 | 5661 | relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op); |
a1ab4c31 | 5662 | |
794511d2 EB |
5663 | switch (op) |
5664 | { | |
5665 | case ALIAS_SET_COPY: | |
5666 | /* The alias set shouldn't be copied between array types with different | |
5667 | aliasing settings because this can break the aliasing relationship | |
5668 | between the array type and its element type. */ | |
c3734896 | 5669 | #ifndef ENABLE_CHECKING |
794511d2 | 5670 | if (flag_strict_aliasing) |
c3734896 | 5671 | #endif |
794511d2 EB |
5672 | gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE |
5673 | && TREE_CODE (gnu_old_type) == ARRAY_TYPE | |
5674 | && TYPE_NONALIASED_COMPONENT (gnu_new_type) | |
5675 | != TYPE_NONALIASED_COMPONENT (gnu_old_type))); | |
5676 | ||
5677 | TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type); | |
5678 | break; | |
5679 | ||
5680 | case ALIAS_SET_SUBSET: | |
5681 | case ALIAS_SET_SUPERSET: | |
5682 | { | |
5683 | alias_set_type old_set = get_alias_set (gnu_old_type); | |
5684 | alias_set_type new_set = get_alias_set (gnu_new_type); | |
5685 | ||
5686 | /* Do nothing if the alias sets conflict. This ensures that we | |
5687 | never call record_alias_subset several times for the same pair | |
5688 | or at all for alias set 0. */ | |
5689 | if (!alias_sets_conflict_p (old_set, new_set)) | |
5690 | { | |
5691 | if (op == ALIAS_SET_SUBSET) | |
5692 | record_alias_subset (old_set, new_set); | |
5693 | else | |
5694 | record_alias_subset (new_set, old_set); | |
5695 | } | |
5696 | } | |
5697 | break; | |
5698 | ||
5699 | default: | |
5700 | gcc_unreachable (); | |
5701 | } | |
c3734896 | 5702 | |
a1ab4c31 AC |
5703 | record_component_aliases (gnu_new_type); |
5704 | } | |
5705 | \f | |
a1ab4c31 AC |
5706 | /* Return true if the size represented by GNU_SIZE can be handled by an |
5707 | allocation. If STATIC_P is true, consider only what can be done with a | |
5708 | static allocation. */ | |
5709 | ||
5710 | static bool | |
5711 | allocatable_size_p (tree gnu_size, bool static_p) | |
5712 | { | |
5713 | HOST_WIDE_INT our_size; | |
5714 | ||
5715 | /* If this is not a static allocation, the only case we want to forbid | |
5716 | is an overflowing size. That will be converted into a raise a | |
5717 | Storage_Error. */ | |
5718 | if (!static_p) | |
5719 | return !(TREE_CODE (gnu_size) == INTEGER_CST | |
5720 | && TREE_OVERFLOW (gnu_size)); | |
5721 | ||
5722 | /* Otherwise, we need to deal with both variable sizes and constant | |
5723 | sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT | |
5724 | since assemblers may not like very large sizes. */ | |
5725 | if (!host_integerp (gnu_size, 1)) | |
5726 | return false; | |
5727 | ||
5728 | our_size = tree_low_cst (gnu_size, 1); | |
5729 | return (int) our_size == our_size; | |
5730 | } | |
5731 | \f | |
5732 | /* Prepend to ATTR_LIST an entry for an attribute with provided TYPE, | |
5733 | NAME, ARGS and ERROR_POINT. */ | |
5734 | ||
5735 | static void | |
5736 | prepend_one_attribute_to (struct attrib ** attr_list, | |
5737 | enum attr_type attr_type, | |
5738 | tree attr_name, | |
5739 | tree attr_args, | |
5740 | Node_Id attr_error_point) | |
5741 | { | |
5742 | struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib)); | |
5743 | ||
5744 | attr->type = attr_type; | |
5745 | attr->name = attr_name; | |
5746 | attr->args = attr_args; | |
5747 | attr->error_point = attr_error_point; | |
5748 | ||
5749 | attr->next = *attr_list; | |
5750 | *attr_list = attr; | |
5751 | } | |
5752 | ||
5753 | /* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */ | |
5754 | ||
5755 | static void | |
5756 | prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list) | |
5757 | { | |
5758 | Node_Id gnat_temp; | |
5759 | ||
d81b4c61 RD |
5760 | /* Attributes are stored as Representation Item pragmas. */ |
5761 | ||
a1ab4c31 AC |
5762 | for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp); |
5763 | gnat_temp = Next_Rep_Item (gnat_temp)) | |
5764 | if (Nkind (gnat_temp) == N_Pragma) | |
5765 | { | |
5766 | tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE; | |
5767 | Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp); | |
5768 | enum attr_type etype; | |
5769 | ||
d81b4c61 RD |
5770 | /* Map the kind of pragma at hand. Skip if this is not one |
5771 | we know how to handle. */ | |
a1ab4c31 AC |
5772 | |
5773 | switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp)))) | |
5774 | { | |
5775 | case Pragma_Machine_Attribute: | |
5776 | etype = ATTR_MACHINE_ATTRIBUTE; | |
5777 | break; | |
5778 | ||
5779 | case Pragma_Linker_Alias: | |
5780 | etype = ATTR_LINK_ALIAS; | |
5781 | break; | |
5782 | ||
5783 | case Pragma_Linker_Section: | |
5784 | etype = ATTR_LINK_SECTION; | |
5785 | break; | |
5786 | ||
5787 | case Pragma_Linker_Constructor: | |
5788 | etype = ATTR_LINK_CONSTRUCTOR; | |
5789 | break; | |
5790 | ||
5791 | case Pragma_Linker_Destructor: | |
5792 | etype = ATTR_LINK_DESTRUCTOR; | |
5793 | break; | |
5794 | ||
5795 | case Pragma_Weak_External: | |
5796 | etype = ATTR_WEAK_EXTERNAL; | |
5797 | break; | |
5798 | ||
40a14772 TG |
5799 | case Pragma_Thread_Local_Storage: |
5800 | etype = ATTR_THREAD_LOCAL_STORAGE; | |
5801 | break; | |
5802 | ||
a1ab4c31 AC |
5803 | default: |
5804 | continue; | |
5805 | } | |
5806 | ||
d81b4c61 RD |
5807 | /* See what arguments we have and turn them into GCC trees for |
5808 | attribute handlers. These expect identifier for strings. We | |
5809 | handle at most two arguments, static expressions only. */ | |
5810 | ||
5811 | if (Present (gnat_assoc) && Present (First (gnat_assoc))) | |
5812 | { | |
5813 | Node_Id gnat_arg0 = Next (First (gnat_assoc)); | |
5814 | Node_Id gnat_arg1 = Empty; | |
5815 | ||
5816 | if (Present (gnat_arg0) | |
5817 | && Is_Static_Expression (Expression (gnat_arg0))) | |
5818 | { | |
5819 | gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0)); | |
5820 | ||
5821 | if (TREE_CODE (gnu_arg0) == STRING_CST) | |
5822 | gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0)); | |
5823 | ||
5824 | gnat_arg1 = Next (gnat_arg0); | |
5825 | } | |
5826 | ||
5827 | if (Present (gnat_arg1) | |
5828 | && Is_Static_Expression (Expression (gnat_arg1))) | |
5829 | { | |
5830 | gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1)); | |
5831 | ||
5832 | if (TREE_CODE (gnu_arg1) == STRING_CST) | |
5833 | gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1)); | |
5834 | } | |
5835 | } | |
a1ab4c31 AC |
5836 | |
5837 | /* Prepend to the list now. Make a list of the argument we might | |
5838 | have, as GCC expects it. */ | |
5839 | prepend_one_attribute_to | |
5840 | (attr_list, | |
5841 | etype, gnu_arg0, | |
5842 | (gnu_arg1 != NULL_TREE) | |
5843 | ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE, | |
5844 | Present (Next (First (gnat_assoc))) | |
5845 | ? Expression (Next (First (gnat_assoc))) : gnat_temp); | |
5846 | } | |
5847 | } | |
5848 | \f | |
a1ab4c31 AC |
5849 | /* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a |
5850 | type definition (either a bound or a discriminant value) for GNAT_ENTITY, | |
a531043b EB |
5851 | return the GCC tree to use for that expression. GNU_NAME is the suffix |
5852 | to use if a variable needs to be created and DEFINITION is true if this | |
5853 | is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result; | |
5854 | otherwise, we are just elaborating the expression for side-effects. If | |
5855 | NEED_DEBUG is true, we need a variable for debugging purposes even if it | |
1e17ef87 | 5856 | isn't needed for code generation. */ |
a1ab4c31 AC |
5857 | |
5858 | static tree | |
a531043b EB |
5859 | elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name, |
5860 | bool definition, bool need_value, bool need_debug) | |
a1ab4c31 AC |
5861 | { |
5862 | tree gnu_expr; | |
5863 | ||
a531043b | 5864 | /* If we already elaborated this expression (e.g. it was involved |
a1ab4c31 AC |
5865 | in the definition of a private type), use the old value. */ |
5866 | if (present_gnu_tree (gnat_expr)) | |
5867 | return get_gnu_tree (gnat_expr); | |
5868 | ||
a531043b EB |
5869 | /* If we don't need a value and this is static or a discriminant, |
5870 | we don't need to do anything. */ | |
5871 | if (!need_value | |
5872 | && (Is_OK_Static_Expression (gnat_expr) | |
5873 | || (Nkind (gnat_expr) == N_Identifier | |
5874 | && Ekind (Entity (gnat_expr)) == E_Discriminant))) | |
5875 | return NULL_TREE; | |
5876 | ||
5877 | /* If it's a static expression, we don't need a variable for debugging. */ | |
5878 | if (need_debug && Is_OK_Static_Expression (gnat_expr)) | |
5879 | need_debug = false; | |
a1ab4c31 | 5880 | |
a531043b EB |
5881 | /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */ |
5882 | gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity, | |
5883 | gnu_name, definition, need_debug); | |
a1ab4c31 AC |
5884 | |
5885 | /* Save the expression in case we try to elaborate this entity again. Since | |
2ddc34ba | 5886 | it's not a DECL, don't check it. Don't save if it's a discriminant. */ |
a1ab4c31 AC |
5887 | if (!CONTAINS_PLACEHOLDER_P (gnu_expr)) |
5888 | save_gnu_tree (gnat_expr, gnu_expr, true); | |
5889 | ||
5890 | return need_value ? gnu_expr : error_mark_node; | |
5891 | } | |
5892 | ||
a531043b | 5893 | /* Similar, but take a GNU expression and always return a result. */ |
a1ab4c31 AC |
5894 | |
5895 | static tree | |
a531043b EB |
5896 | elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name, |
5897 | bool definition, bool need_debug) | |
a1ab4c31 | 5898 | { |
a1ab4c31 AC |
5899 | /* Skip any conversions and simple arithmetics to see if the expression |
5900 | is a read-only variable. | |
5901 | ??? This really should remain read-only, but we have to think about | |
5902 | the typing of the tree here. */ | |
5903 | tree gnu_inner_expr | |
5904 | = skip_simple_arithmetic (remove_conversions (gnu_expr, true)); | |
a531043b | 5905 | tree gnu_decl = NULL_TREE; |
a1ab4c31 AC |
5906 | bool expr_global = Is_Public (gnat_entity) || global_bindings_p (); |
5907 | bool expr_variable; | |
5908 | ||
a531043b EB |
5909 | /* In most cases, we won't see a naked FIELD_DECL because a discriminant |
5910 | reference will have been replaced with a COMPONENT_REF when the type | |
5911 | is being elaborated. However, there are some cases involving child | |
5912 | types where we will. So convert it to a COMPONENT_REF. We hope it | |
5913 | will be at the highest level of the expression in these cases. */ | |
a1ab4c31 AC |
5914 | if (TREE_CODE (gnu_expr) == FIELD_DECL) |
5915 | gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr), | |
5916 | build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)), | |
5917 | gnu_expr, NULL_TREE); | |
5918 | ||
5919 | /* If GNU_EXPR is neither a placeholder nor a constant, nor a variable | |
5920 | that is read-only, make a variable that is initialized to contain the | |
5921 | bound when the package containing the definition is elaborated. If | |
5922 | this entity is defined at top level and a bound or discriminant value | |
5923 | isn't a constant or a reference to a discriminant, replace the bound | |
5924 | by the variable; otherwise use a SAVE_EXPR if needed. Note that we | |
5925 | rely here on the fact that an expression cannot contain both the | |
5926 | discriminant and some other variable. */ | |
a1ab4c31 AC |
5927 | expr_variable = (!CONSTANT_CLASS_P (gnu_expr) |
5928 | && !(TREE_CODE (gnu_inner_expr) == VAR_DECL | |
5929 | && (TREE_READONLY (gnu_inner_expr) | |
5930 | || DECL_READONLY_ONCE_ELAB (gnu_inner_expr))) | |
5931 | && !CONTAINS_PLACEHOLDER_P (gnu_expr)); | |
5932 | ||
a531043b EB |
5933 | /* If GNU_EXPR contains a discriminant, we can't elaborate a variable. */ |
5934 | if (need_debug && CONTAINS_PLACEHOLDER_P (gnu_expr)) | |
a1ab4c31 AC |
5935 | need_debug = false; |
5936 | ||
5937 | /* Now create the variable if we need it. */ | |
5938 | if (need_debug || (expr_variable && expr_global)) | |
5939 | gnu_decl | |
5940 | = create_var_decl (create_concat_name (gnat_entity, | |
5941 | IDENTIFIER_POINTER (gnu_name)), | |
5942 | NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr, | |
5943 | !need_debug, Is_Public (gnat_entity), | |
5944 | !definition, false, NULL, gnat_entity); | |
5945 | ||
5946 | /* We only need to use this variable if we are in global context since GCC | |
5947 | can do the right thing in the local case. */ | |
5948 | if (expr_global && expr_variable) | |
5949 | return gnu_decl; | |
a531043b | 5950 | |
7d7a1fe8 | 5951 | return expr_variable ? gnat_save_expr (gnu_expr) : gnu_expr; |
a1ab4c31 | 5952 | } |
da01bfee EB |
5953 | |
5954 | /* Similar, but take an alignment factor and make it explicit in the tree. */ | |
5955 | ||
5956 | static tree | |
5957 | elaborate_expression_2 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name, | |
5958 | bool definition, bool need_debug, unsigned int align) | |
5959 | { | |
5960 | tree unit_align = size_int (align / BITS_PER_UNIT); | |
5961 | return | |
5962 | size_binop (MULT_EXPR, | |
5963 | elaborate_expression_1 (size_binop (EXACT_DIV_EXPR, | |
5964 | gnu_expr, | |
5965 | unit_align), | |
5966 | gnat_entity, gnu_name, definition, | |
5967 | need_debug), | |
5968 | unit_align); | |
5969 | } | |
a1ab4c31 AC |
5970 | \f |
5971 | /* Create a record type that contains a SIZE bytes long field of TYPE with a | |
5972 | starting bit position so that it is aligned to ALIGN bits, and leaving at | |
5973 | least ROOM bytes free before the field. BASE_ALIGN is the alignment the | |
5974 | record is guaranteed to get. */ | |
5975 | ||
5976 | tree | |
5977 | make_aligning_type (tree type, unsigned int align, tree size, | |
5978 | unsigned int base_align, int room) | |
5979 | { | |
5980 | /* We will be crafting a record type with one field at a position set to be | |
5981 | the next multiple of ALIGN past record'address + room bytes. We use a | |
5982 | record placeholder to express record'address. */ | |
a1ab4c31 AC |
5983 | tree record_type = make_node (RECORD_TYPE); |
5984 | tree record = build0 (PLACEHOLDER_EXPR, record_type); | |
5985 | ||
5986 | tree record_addr_st | |
5987 | = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record)); | |
5988 | ||
5989 | /* The diagram below summarizes the shape of what we manipulate: | |
5990 | ||
5991 | <--------- pos ----------> | |
5992 | { +------------+-------------+-----------------+ | |
5993 | record =>{ |############| ... | field (type) | | |
5994 | { +------------+-------------+-----------------+ | |
5995 | |<-- room -->|<- voffset ->|<---- size ----->| | |
5996 | o o | |
5997 | | | | |
5998 | record_addr vblock_addr | |
5999 | ||
6000 | Every length is in sizetype bytes there, except "pos" which has to be | |
6001 | set as a bit position in the GCC tree for the record. */ | |
a1ab4c31 AC |
6002 | tree room_st = size_int (room); |
6003 | tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st); | |
6004 | tree voffset_st, pos, field; | |
6005 | ||
6006 | tree name = TYPE_NAME (type); | |
6007 | ||
6008 | if (TREE_CODE (name) == TYPE_DECL) | |
6009 | name = DECL_NAME (name); | |
9c026b87 EB |
6010 | name = concat_name (name, "ALIGN"); |
6011 | TYPE_NAME (record_type) = name; | |
a1ab4c31 AC |
6012 | |
6013 | /* Compute VOFFSET and then POS. The next byte position multiple of some | |
6014 | alignment after some address is obtained by "and"ing the alignment minus | |
6015 | 1 with the two's complement of the address. */ | |
a1ab4c31 | 6016 | voffset_st = size_binop (BIT_AND_EXPR, |
1081f5a7 EB |
6017 | fold_build1 (NEGATE_EXPR, sizetype, vblock_addr_st), |
6018 | size_int ((align / BITS_PER_UNIT) - 1)); | |
a1ab4c31 AC |
6019 | |
6020 | /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */ | |
a1ab4c31 AC |
6021 | pos = size_binop (MULT_EXPR, |
6022 | convert (bitsizetype, | |
6023 | size_binop (PLUS_EXPR, room_st, voffset_st)), | |
6024 | bitsize_unit_node); | |
6025 | ||
6026 | /* Craft the GCC record representation. We exceptionally do everything | |
6027 | manually here because 1) our generic circuitry is not quite ready to | |
6028 | handle the complex position/size expressions we are setting up, 2) we | |
6029 | have a strong simplifying factor at hand: we know the maximum possible | |
6030 | value of voffset, and 3) we have to set/reset at least the sizes in | |
6031 | accordance with this maximum value anyway, as we need them to convey | |
6032 | what should be "alloc"ated for this type. | |
6033 | ||
6034 | Use -1 as the 'addressable' indication for the field to prevent the | |
6035 | creation of a bitfield. We don't need one, it would have damaging | |
6036 | consequences on the alignment computation, and create_field_decl would | |
6037 | make one without this special argument, for instance because of the | |
6038 | complex position expression. */ | |
da01bfee EB |
6039 | field = create_field_decl (get_identifier ("F"), type, record_type, size, |
6040 | pos, 1, -1); | |
a1ab4c31 AC |
6041 | TYPE_FIELDS (record_type) = field; |
6042 | ||
6043 | TYPE_ALIGN (record_type) = base_align; | |
6044 | TYPE_USER_ALIGN (record_type) = 1; | |
6045 | ||
6046 | TYPE_SIZE (record_type) | |
6047 | = size_binop (PLUS_EXPR, | |
6048 | size_binop (MULT_EXPR, convert (bitsizetype, size), | |
6049 | bitsize_unit_node), | |
6050 | bitsize_int (align + room * BITS_PER_UNIT)); | |
6051 | TYPE_SIZE_UNIT (record_type) | |
6052 | = size_binop (PLUS_EXPR, size, | |
6053 | size_int (room + align / BITS_PER_UNIT)); | |
6054 | ||
6f9f0ce3 | 6055 | SET_TYPE_MODE (record_type, BLKmode); |
794511d2 | 6056 | relate_alias_sets (record_type, type, ALIAS_SET_COPY); |
9c026b87 EB |
6057 | |
6058 | /* Declare it now since it will never be declared otherwise. This is | |
6059 | necessary to ensure that its subtrees are properly marked. */ | |
6060 | create_type_decl (name, record_type, NULL, true, false, Empty); | |
6061 | ||
a1ab4c31 AC |
6062 | return record_type; |
6063 | } | |
6064 | \f | |
6065 | /* Return the result of rounding T up to ALIGN. */ | |
6066 | ||
6067 | static inline unsigned HOST_WIDE_INT | |
6068 | round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align) | |
6069 | { | |
6070 | t += align - 1; | |
6071 | t /= align; | |
6072 | t *= align; | |
6073 | return t; | |
6074 | } | |
6075 | ||
6076 | /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used | |
6077 | as the field type of a packed record if IN_RECORD is true, or as the | |
6078 | component type of a packed array if IN_RECORD is false. See if we can | |
6079 | rewrite it either as a type that has a non-BLKmode, which we can pack | |
39ae51e0 EB |
6080 | tighter in the packed record case, or as a smaller type. If so, return |
6081 | the new type. If not, return the original type. */ | |
a1ab4c31 AC |
6082 | |
6083 | static tree | |
6084 | make_packable_type (tree type, bool in_record) | |
6085 | { | |
6086 | unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1); | |
6087 | unsigned HOST_WIDE_INT new_size; | |
6088 | tree new_type, old_field, field_list = NULL_TREE; | |
6089 | ||
6090 | /* No point in doing anything if the size is zero. */ | |
6091 | if (size == 0) | |
6092 | return type; | |
6093 | ||
6094 | new_type = make_node (TREE_CODE (type)); | |
6095 | ||
6096 | /* Copy the name and flags from the old type to that of the new. | |
6097 | Note that we rely on the pointer equality created here for | |
6098 | TYPE_NAME to look through conversions in various places. */ | |
6099 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
6100 | TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type); | |
6101 | TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type); | |
6102 | if (TREE_CODE (type) == RECORD_TYPE) | |
315cff15 | 6103 | TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type); |
a1ab4c31 AC |
6104 | |
6105 | /* If we are in a record and have a small size, set the alignment to | |
6106 | try for an integral mode. Otherwise set it to try for a smaller | |
6107 | type with BLKmode. */ | |
6108 | if (in_record && size <= MAX_FIXED_MODE_SIZE) | |
6109 | { | |
6110 | TYPE_ALIGN (new_type) = ceil_alignment (size); | |
6111 | new_size = round_up_to_align (size, TYPE_ALIGN (new_type)); | |
6112 | } | |
6113 | else | |
6114 | { | |
6115 | unsigned HOST_WIDE_INT align; | |
6116 | ||
6117 | /* Do not try to shrink the size if the RM size is not constant. */ | |
6118 | if (TYPE_CONTAINS_TEMPLATE_P (type) | |
6119 | || !host_integerp (TYPE_ADA_SIZE (type), 1)) | |
6120 | return type; | |
6121 | ||
6122 | /* Round the RM size up to a unit boundary to get the minimal size | |
6123 | for a BLKmode record. Give up if it's already the size. */ | |
6124 | new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type)); | |
6125 | new_size = round_up_to_align (new_size, BITS_PER_UNIT); | |
6126 | if (new_size == size) | |
6127 | return type; | |
6128 | ||
6129 | align = new_size & -new_size; | |
6130 | TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align); | |
6131 | } | |
6132 | ||
6133 | TYPE_USER_ALIGN (new_type) = 1; | |
6134 | ||
6135 | /* Now copy the fields, keeping the position and size as we don't want | |
6136 | to change the layout by propagating the packedness downwards. */ | |
6137 | for (old_field = TYPE_FIELDS (type); old_field; | |
910ad8de | 6138 | old_field = DECL_CHAIN (old_field)) |
a1ab4c31 AC |
6139 | { |
6140 | tree new_field_type = TREE_TYPE (old_field); | |
6141 | tree new_field, new_size; | |
6142 | ||
39ae51e0 EB |
6143 | if ((TREE_CODE (new_field_type) == RECORD_TYPE |
6144 | || TREE_CODE (new_field_type) == UNION_TYPE | |
6145 | || TREE_CODE (new_field_type) == QUAL_UNION_TYPE) | |
315cff15 | 6146 | && !TYPE_FAT_POINTER_P (new_field_type) |
a1ab4c31 AC |
6147 | && host_integerp (TYPE_SIZE (new_field_type), 1)) |
6148 | new_field_type = make_packable_type (new_field_type, true); | |
6149 | ||
6150 | /* However, for the last field in a not already packed record type | |
b4680ca1 | 6151 | that is of an aggregate type, we need to use the RM size in the |
a1ab4c31 | 6152 | packable version of the record type, see finish_record_type. */ |
910ad8de | 6153 | if (!DECL_CHAIN (old_field) |
a1ab4c31 AC |
6154 | && !TYPE_PACKED (type) |
6155 | && (TREE_CODE (new_field_type) == RECORD_TYPE | |
6156 | || TREE_CODE (new_field_type) == UNION_TYPE | |
6157 | || TREE_CODE (new_field_type) == QUAL_UNION_TYPE) | |
315cff15 | 6158 | && !TYPE_FAT_POINTER_P (new_field_type) |
a1ab4c31 AC |
6159 | && !TYPE_CONTAINS_TEMPLATE_P (new_field_type) |
6160 | && TYPE_ADA_SIZE (new_field_type)) | |
6161 | new_size = TYPE_ADA_SIZE (new_field_type); | |
6162 | else | |
6163 | new_size = DECL_SIZE (old_field); | |
6164 | ||
da01bfee EB |
6165 | new_field |
6166 | = create_field_decl (DECL_NAME (old_field), new_field_type, new_type, | |
6167 | new_size, bit_position (old_field), | |
6168 | TYPE_PACKED (type), | |
6169 | !DECL_NONADDRESSABLE_P (old_field)); | |
a1ab4c31 AC |
6170 | |
6171 | DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); | |
cb3d597d | 6172 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field); |
a1ab4c31 AC |
6173 | if (TREE_CODE (new_type) == QUAL_UNION_TYPE) |
6174 | DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field); | |
6175 | ||
910ad8de | 6176 | DECL_CHAIN (new_field) = field_list; |
a1ab4c31 AC |
6177 | field_list = new_field; |
6178 | } | |
6179 | ||
032d1b71 | 6180 | finish_record_type (new_type, nreverse (field_list), 2, false); |
794511d2 | 6181 | relate_alias_sets (new_type, type, ALIAS_SET_COPY); |
a1ab4c31 AC |
6182 | |
6183 | /* If this is a padding record, we never want to make the size smaller | |
6184 | than what was specified. For QUAL_UNION_TYPE, also copy the size. */ | |
315cff15 | 6185 | if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE) |
a1ab4c31 AC |
6186 | { |
6187 | TYPE_SIZE (new_type) = TYPE_SIZE (type); | |
6188 | TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type); | |
d770e88d | 6189 | new_size = size; |
a1ab4c31 AC |
6190 | } |
6191 | else | |
6192 | { | |
6193 | TYPE_SIZE (new_type) = bitsize_int (new_size); | |
6194 | TYPE_SIZE_UNIT (new_type) | |
6195 | = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT); | |
6196 | } | |
6197 | ||
6198 | if (!TYPE_CONTAINS_TEMPLATE_P (type)) | |
6199 | SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type)); | |
6200 | ||
6201 | compute_record_mode (new_type); | |
6202 | ||
6203 | /* Try harder to get a packable type if necessary, for example | |
6204 | in case the record itself contains a BLKmode field. */ | |
6205 | if (in_record && TYPE_MODE (new_type) == BLKmode) | |
6f9f0ce3 JJ |
6206 | SET_TYPE_MODE (new_type, |
6207 | mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1)); | |
a1ab4c31 AC |
6208 | |
6209 | /* If neither the mode nor the size has shrunk, return the old type. */ | |
6210 | if (TYPE_MODE (new_type) == BLKmode && new_size >= size) | |
6211 | return type; | |
6212 | ||
6213 | return new_type; | |
6214 | } | |
6215 | \f | |
6216 | /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type | |
6217 | if needed. We have already verified that SIZE and TYPE are large enough. | |
afb4afcd EB |
6218 | GNAT_ENTITY is used to name the resulting record and to issue a warning. |
6219 | IS_COMPONENT_TYPE is true if this is being done for the component type | |
6220 | of an array. IS_USER_TYPE is true if we must complete the original type. | |
6221 | DEFINITION is true if this type is being defined. SAME_RM_SIZE is true | |
6222 | if the RM size of the resulting type is to be set to SIZE too; otherwise, | |
6223 | it's set to the RM size of the original type. */ | |
a1ab4c31 AC |
6224 | |
6225 | tree | |
6226 | maybe_pad_type (tree type, tree size, unsigned int align, | |
afb4afcd | 6227 | Entity_Id gnat_entity, bool is_component_type, |
a1ab4c31 AC |
6228 | bool is_user_type, bool definition, bool same_rm_size) |
6229 | { | |
6230 | tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type); | |
6231 | tree orig_size = TYPE_SIZE (type); | |
a1ab4c31 AC |
6232 | tree record, field; |
6233 | ||
6234 | /* If TYPE is a padded type, see if it agrees with any size and alignment | |
6235 | we were given. If so, return the original type. Otherwise, strip | |
6236 | off the padding, since we will either be returning the inner type | |
6237 | or repadding it. If no size or alignment is specified, use that of | |
6238 | the original padded type. */ | |
315cff15 | 6239 | if (TYPE_IS_PADDING_P (type)) |
a1ab4c31 AC |
6240 | { |
6241 | if ((!size | |
6242 | || operand_equal_p (round_up (size, | |
6243 | MAX (align, TYPE_ALIGN (type))), | |
6244 | round_up (TYPE_SIZE (type), | |
6245 | MAX (align, TYPE_ALIGN (type))), | |
6246 | 0)) | |
6247 | && (align == 0 || align == TYPE_ALIGN (type))) | |
6248 | return type; | |
6249 | ||
6250 | if (!size) | |
6251 | size = TYPE_SIZE (type); | |
6252 | if (align == 0) | |
6253 | align = TYPE_ALIGN (type); | |
6254 | ||
6255 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
6256 | orig_size = TYPE_SIZE (type); | |
6257 | } | |
6258 | ||
6259 | /* If the size is either not being changed or is being made smaller (which | |
4fd78fe6 | 6260 | is not done here and is only valid for bitfields anyway), show the size |
a1ab4c31 AC |
6261 | isn't changing. Likewise, clear the alignment if it isn't being |
6262 | changed. Then return if we aren't doing anything. */ | |
6263 | if (size | |
6264 | && (operand_equal_p (size, orig_size, 0) | |
6265 | || (TREE_CODE (orig_size) == INTEGER_CST | |
6266 | && tree_int_cst_lt (size, orig_size)))) | |
6267 | size = NULL_TREE; | |
6268 | ||
6269 | if (align == TYPE_ALIGN (type)) | |
6270 | align = 0; | |
6271 | ||
6272 | if (align == 0 && !size) | |
6273 | return type; | |
6274 | ||
6275 | /* If requested, complete the original type and give it a name. */ | |
6276 | if (is_user_type) | |
6277 | create_type_decl (get_entity_name (gnat_entity), type, | |
6278 | NULL, !Comes_From_Source (gnat_entity), | |
6279 | !(TYPE_NAME (type) | |
6280 | && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
6281 | && DECL_IGNORED_P (TYPE_NAME (type))), | |
6282 | gnat_entity); | |
6283 | ||
6284 | /* We used to modify the record in place in some cases, but that could | |
6285 | generate incorrect debugging information. So make a new record | |
6286 | type and name. */ | |
6287 | record = make_node (RECORD_TYPE); | |
315cff15 | 6288 | TYPE_PADDING_P (record) = 1; |
a1ab4c31 AC |
6289 | |
6290 | if (Present (gnat_entity)) | |
afb4afcd | 6291 | TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD"); |
a1ab4c31 AC |
6292 | |
6293 | TYPE_VOLATILE (record) | |
6294 | = Present (gnat_entity) && Treat_As_Volatile (gnat_entity); | |
6295 | ||
6296 | TYPE_ALIGN (record) = align; | |
a1ab4c31 AC |
6297 | TYPE_SIZE (record) = size ? size : orig_size; |
6298 | TYPE_SIZE_UNIT (record) | |
6299 | = convert (sizetype, | |
6300 | size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record), | |
6301 | bitsize_unit_node)); | |
6302 | ||
6303 | /* If we are changing the alignment and the input type is a record with | |
6304 | BLKmode and a small constant size, try to make a form that has an | |
6305 | integral mode. This might allow the padding record to also have an | |
6306 | integral mode, which will be much more efficient. There is no point | |
6307 | in doing so if a size is specified unless it is also a small constant | |
6308 | size and it is incorrect to do so if we cannot guarantee that the mode | |
6309 | will be naturally aligned since the field must always be addressable. | |
6310 | ||
6311 | ??? This might not always be a win when done for a stand-alone object: | |
6312 | since the nominal and the effective type of the object will now have | |
6313 | different modes, a VIEW_CONVERT_EXPR will be required for converting | |
6314 | between them and it might be hard to overcome afterwards, including | |
6315 | at the RTL level when the stand-alone object is accessed as a whole. */ | |
6316 | if (align != 0 | |
6317 | && TREE_CODE (type) == RECORD_TYPE | |
6318 | && TYPE_MODE (type) == BLKmode | |
6319 | && TREE_CODE (orig_size) == INTEGER_CST | |
bd9f68e0 | 6320 | && !TREE_OVERFLOW (orig_size) |
a1ab4c31 AC |
6321 | && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0 |
6322 | && (!size | |
6323 | || (TREE_CODE (size) == INTEGER_CST | |
6324 | && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0))) | |
6325 | { | |
6326 | tree packable_type = make_packable_type (type, true); | |
6327 | if (TYPE_MODE (packable_type) != BLKmode | |
6328 | && align >= TYPE_ALIGN (packable_type)) | |
6329 | type = packable_type; | |
6330 | } | |
6331 | ||
6332 | /* Now create the field with the original size. */ | |
da01bfee EB |
6333 | field = create_field_decl (get_identifier ("F"), type, record, orig_size, |
6334 | bitsize_zero_node, 0, 1); | |
a1ab4c31 AC |
6335 | DECL_INTERNAL_P (field) = 1; |
6336 | ||
032d1b71 EB |
6337 | /* Do not emit debug info until after the auxiliary record is built. */ |
6338 | finish_record_type (record, field, 1, false); | |
a1ab4c31 | 6339 | |
b4680ca1 EB |
6340 | /* Set the same size for its RM size if requested; otherwise reuse |
6341 | the RM size of the original type. */ | |
a1ab4c31 AC |
6342 | SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size); |
6343 | ||
6344 | /* Unless debugging information isn't being written for the input type, | |
6345 | write a record that shows what we are a subtype of and also make a | |
2ddc34ba | 6346 | variable that indicates our size, if still variable. */ |
032d1b71 EB |
6347 | if (TREE_CODE (orig_size) != INTEGER_CST |
6348 | && TYPE_NAME (record) | |
6349 | && TYPE_NAME (type) | |
a1ab4c31 AC |
6350 | && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL |
6351 | && DECL_IGNORED_P (TYPE_NAME (type)))) | |
6352 | { | |
6353 | tree marker = make_node (RECORD_TYPE); | |
6354 | tree name = TYPE_NAME (record); | |
6355 | tree orig_name = TYPE_NAME (type); | |
6356 | ||
6357 | if (TREE_CODE (name) == TYPE_DECL) | |
6358 | name = DECL_NAME (name); | |
6359 | ||
6360 | if (TREE_CODE (orig_name) == TYPE_DECL) | |
6361 | orig_name = DECL_NAME (orig_name); | |
6362 | ||
0fb2335d | 6363 | TYPE_NAME (marker) = concat_name (name, "XVS"); |
a1ab4c31 | 6364 | finish_record_type (marker, |
c244bf8f EB |
6365 | create_field_decl (orig_name, |
6366 | build_reference_type (type), | |
da01bfee EB |
6367 | marker, NULL_TREE, NULL_TREE, |
6368 | 0, 0), | |
032d1b71 | 6369 | 0, true); |
a1ab4c31 AC |
6370 | |
6371 | add_parallel_type (TYPE_STUB_DECL (record), marker); | |
6372 | ||
e9cfc9b5 | 6373 | if (definition && size && TREE_CODE (size) != INTEGER_CST) |
b5bba4a6 EB |
6374 | TYPE_SIZE_UNIT (marker) |
6375 | = create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype, | |
6376 | TYPE_SIZE_UNIT (record), false, false, false, | |
6377 | false, NULL, gnat_entity); | |
a1ab4c31 AC |
6378 | } |
6379 | ||
6380 | rest_of_record_type_compilation (record); | |
6381 | ||
6382 | /* If the size was widened explicitly, maybe give a warning. Take the | |
6383 | original size as the maximum size of the input if there was an | |
6384 | unconstrained record involved and round it up to the specified alignment, | |
6385 | if one was specified. */ | |
6386 | if (CONTAINS_PLACEHOLDER_P (orig_size)) | |
6387 | orig_size = max_size (orig_size, true); | |
6388 | ||
6389 | if (align) | |
6390 | orig_size = round_up (orig_size, align); | |
6391 | ||
2cac6017 EB |
6392 | if (Present (gnat_entity) |
6393 | && size | |
1aa8b1dd | 6394 | && TREE_CODE (size) != MAX_EXPR |
1081f5a7 | 6395 | && TREE_CODE (size) != COND_EXPR |
a1ab4c31 AC |
6396 | && !operand_equal_p (size, orig_size, 0) |
6397 | && !(TREE_CODE (size) == INTEGER_CST | |
6398 | && TREE_CODE (orig_size) == INTEGER_CST | |
586388fd EB |
6399 | && (TREE_OVERFLOW (size) |
6400 | || TREE_OVERFLOW (orig_size) | |
6401 | || tree_int_cst_lt (size, orig_size)))) | |
a1ab4c31 AC |
6402 | { |
6403 | Node_Id gnat_error_node = Empty; | |
6404 | ||
6405 | if (Is_Packed_Array_Type (gnat_entity)) | |
6406 | gnat_entity = Original_Array_Type (gnat_entity); | |
6407 | ||
6408 | if ((Ekind (gnat_entity) == E_Component | |
6409 | || Ekind (gnat_entity) == E_Discriminant) | |
6410 | && Present (Component_Clause (gnat_entity))) | |
6411 | gnat_error_node = Last_Bit (Component_Clause (gnat_entity)); | |
6412 | else if (Present (Size_Clause (gnat_entity))) | |
6413 | gnat_error_node = Expression (Size_Clause (gnat_entity)); | |
6414 | ||
6415 | /* Generate message only for entities that come from source, since | |
6416 | if we have an entity created by expansion, the message will be | |
6417 | generated for some other corresponding source entity. */ | |
2cac6017 EB |
6418 | if (Comes_From_Source (gnat_entity)) |
6419 | { | |
6420 | if (Present (gnat_error_node)) | |
6421 | post_error_ne_tree ("{^ }bits of & unused?", | |
6422 | gnat_error_node, gnat_entity, | |
6423 | size_diffop (size, orig_size)); | |
afb4afcd | 6424 | else if (is_component_type) |
2cac6017 EB |
6425 | post_error_ne_tree ("component of& padded{ by ^ bits}?", |
6426 | gnat_entity, gnat_entity, | |
6427 | size_diffop (size, orig_size)); | |
6428 | } | |
a1ab4c31 AC |
6429 | } |
6430 | ||
6431 | return record; | |
6432 | } | |
6433 | \f | |
6434 | /* Given a GNU tree and a GNAT list of choices, generate an expression to test | |
6435 | the value passed against the list of choices. */ | |
6436 | ||
6437 | tree | |
6438 | choices_to_gnu (tree operand, Node_Id choices) | |
6439 | { | |
6440 | Node_Id choice; | |
6441 | Node_Id gnat_temp; | |
6442 | tree result = integer_zero_node; | |
6443 | tree this_test, low = 0, high = 0, single = 0; | |
6444 | ||
6445 | for (choice = First (choices); Present (choice); choice = Next (choice)) | |
6446 | { | |
6447 | switch (Nkind (choice)) | |
6448 | { | |
6449 | case N_Range: | |
6450 | low = gnat_to_gnu (Low_Bound (choice)); | |
6451 | high = gnat_to_gnu (High_Bound (choice)); | |
6452 | ||
a1ab4c31 | 6453 | this_test |
1139f2e8 EB |
6454 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6455 | build_binary_op (GE_EXPR, boolean_type_node, | |
a1ab4c31 | 6456 | operand, low), |
1139f2e8 | 6457 | build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
6458 | operand, high)); |
6459 | ||
6460 | break; | |
6461 | ||
6462 | case N_Subtype_Indication: | |
6463 | gnat_temp = Range_Expression (Constraint (choice)); | |
6464 | low = gnat_to_gnu (Low_Bound (gnat_temp)); | |
6465 | high = gnat_to_gnu (High_Bound (gnat_temp)); | |
6466 | ||
6467 | this_test | |
1139f2e8 EB |
6468 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6469 | build_binary_op (GE_EXPR, boolean_type_node, | |
a1ab4c31 | 6470 | operand, low), |
1139f2e8 | 6471 | build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
6472 | operand, high)); |
6473 | break; | |
6474 | ||
6475 | case N_Identifier: | |
6476 | case N_Expanded_Name: | |
6477 | /* This represents either a subtype range, an enumeration | |
6478 | literal, or a constant Ekind says which. If an enumeration | |
6479 | literal or constant, fall through to the next case. */ | |
6480 | if (Ekind (Entity (choice)) != E_Enumeration_Literal | |
6481 | && Ekind (Entity (choice)) != E_Constant) | |
6482 | { | |
6483 | tree type = gnat_to_gnu_type (Entity (choice)); | |
6484 | ||
6485 | low = TYPE_MIN_VALUE (type); | |
6486 | high = TYPE_MAX_VALUE (type); | |
6487 | ||
6488 | this_test | |
1139f2e8 EB |
6489 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
6490 | build_binary_op (GE_EXPR, boolean_type_node, | |
a1ab4c31 | 6491 | operand, low), |
1139f2e8 | 6492 | build_binary_op (LE_EXPR, boolean_type_node, |
a1ab4c31 AC |
6493 | operand, high)); |
6494 | break; | |
6495 | } | |
2ddc34ba | 6496 | |
a1ab4c31 | 6497 | /* ... fall through ... */ |
2ddc34ba | 6498 | |
a1ab4c31 AC |
6499 | case N_Character_Literal: |
6500 | case N_Integer_Literal: | |
6501 | single = gnat_to_gnu (choice); | |
1139f2e8 | 6502 | this_test = build_binary_op (EQ_EXPR, boolean_type_node, operand, |
a1ab4c31 AC |
6503 | single); |
6504 | break; | |
6505 | ||
6506 | case N_Others_Choice: | |
6507 | this_test = integer_one_node; | |
6508 | break; | |
6509 | ||
6510 | default: | |
6511 | gcc_unreachable (); | |
6512 | } | |
6513 | ||
1139f2e8 EB |
6514 | result = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, result, |
6515 | this_test); | |
a1ab4c31 AC |
6516 | } |
6517 | ||
6518 | return result; | |
6519 | } | |
6520 | \f | |
6521 | /* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of | |
6522 | type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */ | |
6523 | ||
6524 | static int | |
6525 | adjust_packed (tree field_type, tree record_type, int packed) | |
6526 | { | |
6527 | /* If the field contains an item of variable size, we cannot pack it | |
6528 | because we cannot create temporaries of non-fixed size in case | |
6529 | we need to take the address of the field. See addressable_p and | |
6530 | the notes on the addressability issues for further details. */ | |
6531 | if (is_variable_size (field_type)) | |
6532 | return 0; | |
6533 | ||
6534 | /* If the alignment of the record is specified and the field type | |
6535 | is over-aligned, request Storage_Unit alignment for the field. */ | |
6536 | if (packed == -2) | |
6537 | { | |
6538 | if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type)) | |
6539 | return -1; | |
6540 | else | |
6541 | return 0; | |
6542 | } | |
6543 | ||
6544 | return packed; | |
6545 | } | |
6546 | ||
6547 | /* Return a GCC tree for a field corresponding to GNAT_FIELD to be | |
6548 | placed in GNU_RECORD_TYPE. | |
6549 | ||
6550 | PACKED is 1 if the enclosing record is packed, -1 if the enclosing | |
6551 | record has Component_Alignment of Storage_Unit, -2 if the enclosing | |
6552 | record has a specified alignment. | |
6553 | ||
839f2864 EB |
6554 | DEFINITION is true if this field is for a record being defined. |
6555 | ||
6556 | DEBUG_INFO_P is true if we need to write debug information for types | |
6557 | that we may create in the process. */ | |
a1ab4c31 AC |
6558 | |
6559 | static tree | |
6560 | gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed, | |
839f2864 | 6561 | bool definition, bool debug_info_p) |
a1ab4c31 AC |
6562 | { |
6563 | tree gnu_field_id = get_entity_name (gnat_field); | |
6564 | tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field)); | |
6565 | tree gnu_field, gnu_size, gnu_pos; | |
6566 | bool needs_strict_alignment | |
6567 | = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field)) | |
6568 | || Treat_As_Volatile (gnat_field)); | |
6569 | ||
6570 | /* If this field requires strict alignment, we cannot pack it because | |
6571 | it would very likely be under-aligned in the record. */ | |
6572 | if (needs_strict_alignment) | |
6573 | packed = 0; | |
6574 | else | |
6575 | packed = adjust_packed (gnu_field_type, gnu_record_type, packed); | |
6576 | ||
6577 | /* If a size is specified, use it. Otherwise, if the record type is packed, | |
6578 | use the official RM size. See "Handling of Type'Size Values" in Einfo | |
6579 | for further details. */ | |
6580 | if (Known_Static_Esize (gnat_field)) | |
6581 | gnu_size = validate_size (Esize (gnat_field), gnu_field_type, | |
6582 | gnat_field, FIELD_DECL, false, true); | |
6583 | else if (packed == 1) | |
6584 | gnu_size = validate_size (RM_Size (Etype (gnat_field)), gnu_field_type, | |
6585 | gnat_field, FIELD_DECL, false, true); | |
6586 | else | |
6587 | gnu_size = NULL_TREE; | |
6588 | ||
d770e88d EB |
6589 | /* If we have a specified size that is smaller than that of the field's type, |
6590 | or a position is specified, and the field's type is a record that doesn't | |
6591 | require strict alignment, see if we can get either an integral mode form | |
6592 | of the type or a smaller form. If we can, show a size was specified for | |
6593 | the field if there wasn't one already, so we know to make this a bitfield | |
6594 | and avoid making things wider. | |
a1ab4c31 | 6595 | |
d770e88d EB |
6596 | Changing to an integral mode form is useful when the record is packed as |
6597 | we can then place the field at a non-byte-aligned position and so achieve | |
6598 | tighter packing. This is in addition required if the field shares a byte | |
6599 | with another field and the front-end lets the back-end handle the access | |
6600 | to the field, because GCC cannot handle non-byte-aligned BLKmode fields. | |
a1ab4c31 | 6601 | |
d770e88d EB |
6602 | Changing to a smaller form is required if the specified size is smaller |
6603 | than that of the field's type and the type contains sub-fields that are | |
6604 | padded, in order to avoid generating accesses to these sub-fields that | |
6605 | are wider than the field. | |
a1ab4c31 AC |
6606 | |
6607 | We avoid the transformation if it is not required or potentially useful, | |
6608 | as it might entail an increase of the field's alignment and have ripple | |
6609 | effects on the outer record type. A typical case is a field known to be | |
d770e88d EB |
6610 | byte-aligned and not to share a byte with another field. */ |
6611 | if (!needs_strict_alignment | |
6612 | && TREE_CODE (gnu_field_type) == RECORD_TYPE | |
315cff15 | 6613 | && !TYPE_FAT_POINTER_P (gnu_field_type) |
a1ab4c31 AC |
6614 | && host_integerp (TYPE_SIZE (gnu_field_type), 1) |
6615 | && (packed == 1 | |
6616 | || (gnu_size | |
6617 | && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type)) | |
d770e88d EB |
6618 | || (Present (Component_Clause (gnat_field)) |
6619 | && !(UI_To_Int (Component_Bit_Offset (gnat_field)) | |
6620 | % BITS_PER_UNIT == 0 | |
6621 | && value_factor_p (gnu_size, BITS_PER_UNIT))))))) | |
a1ab4c31 | 6622 | { |
a1ab4c31 | 6623 | tree gnu_packable_type = make_packable_type (gnu_field_type, true); |
d770e88d | 6624 | if (gnu_packable_type != gnu_field_type) |
a1ab4c31 AC |
6625 | { |
6626 | gnu_field_type = gnu_packable_type; | |
a1ab4c31 AC |
6627 | if (!gnu_size) |
6628 | gnu_size = rm_size (gnu_field_type); | |
6629 | } | |
6630 | } | |
6631 | ||
6632 | /* If we are packing the record and the field is BLKmode, round the | |
6633 | size up to a byte boundary. */ | |
6634 | if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size) | |
6635 | gnu_size = round_up (gnu_size, BITS_PER_UNIT); | |
6636 | ||
6637 | if (Present (Component_Clause (gnat_field))) | |
6638 | { | |
ec88784d AC |
6639 | Entity_Id gnat_parent |
6640 | = Parent_Subtype (Underlying_Type (Scope (gnat_field))); | |
6641 | ||
a1ab4c31 AC |
6642 | gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype); |
6643 | gnu_size = validate_size (Esize (gnat_field), gnu_field_type, | |
6644 | gnat_field, FIELD_DECL, false, true); | |
6645 | ||
ec88784d AC |
6646 | /* Ensure the position does not overlap with the parent subtype, if there |
6647 | is one. This test is omitted if the parent of the tagged type has a | |
6648 | full rep clause since, in this case, component clauses are allowed to | |
6649 | overlay the space allocated for the parent type and the front-end has | |
6650 | checked that there are no overlapping components. */ | |
6651 | if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent)) | |
a1ab4c31 | 6652 | { |
ec88784d | 6653 | tree gnu_parent = gnat_to_gnu_type (gnat_parent); |
a1ab4c31 AC |
6654 | |
6655 | if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST | |
6656 | && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent))) | |
6657 | { | |
6658 | post_error_ne_tree | |
6659 | ("offset of& must be beyond parent{, minimum allowed is ^}", | |
6660 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6661 | TYPE_SIZE_UNIT (gnu_parent)); | |
6662 | } | |
6663 | } | |
6664 | ||
6665 | /* If this field needs strict alignment, ensure the record is | |
6666 | sufficiently aligned and that that position and size are | |
6667 | consistent with the alignment. */ | |
6668 | if (needs_strict_alignment) | |
6669 | { | |
6670 | TYPE_ALIGN (gnu_record_type) | |
6671 | = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type)); | |
6672 | ||
6673 | if (gnu_size | |
6674 | && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0)) | |
6675 | { | |
6676 | if (Is_Atomic (gnat_field) || Is_Atomic (Etype (gnat_field))) | |
6677 | post_error_ne_tree | |
6678 | ("atomic field& must be natural size of type{ (^)}", | |
6679 | Last_Bit (Component_Clause (gnat_field)), gnat_field, | |
6680 | TYPE_SIZE (gnu_field_type)); | |
6681 | ||
6682 | else if (Is_Aliased (gnat_field)) | |
6683 | post_error_ne_tree | |
6684 | ("size of aliased field& must be ^ bits", | |
6685 | Last_Bit (Component_Clause (gnat_field)), gnat_field, | |
6686 | TYPE_SIZE (gnu_field_type)); | |
6687 | ||
6688 | else if (Strict_Alignment (Etype (gnat_field))) | |
6689 | post_error_ne_tree | |
6690 | ("size of & with aliased or tagged components not ^ bits", | |
6691 | Last_Bit (Component_Clause (gnat_field)), gnat_field, | |
6692 | TYPE_SIZE (gnu_field_type)); | |
6693 | ||
6694 | gnu_size = NULL_TREE; | |
6695 | } | |
6696 | ||
6697 | if (!integer_zerop (size_binop | |
6698 | (TRUNC_MOD_EXPR, gnu_pos, | |
6699 | bitsize_int (TYPE_ALIGN (gnu_field_type))))) | |
6700 | { | |
6701 | if (Is_Aliased (gnat_field)) | |
6702 | post_error_ne_num | |
6703 | ("position of aliased field& must be multiple of ^ bits", | |
6704 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6705 | TYPE_ALIGN (gnu_field_type)); | |
6706 | ||
6707 | else if (Treat_As_Volatile (gnat_field)) | |
6708 | post_error_ne_num | |
6709 | ("position of volatile field& must be multiple of ^ bits", | |
6710 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6711 | TYPE_ALIGN (gnu_field_type)); | |
6712 | ||
6713 | else if (Strict_Alignment (Etype (gnat_field))) | |
6714 | post_error_ne_num | |
6715 | ("position of & with aliased or tagged components not multiple of ^ bits", | |
6716 | First_Bit (Component_Clause (gnat_field)), gnat_field, | |
6717 | TYPE_ALIGN (gnu_field_type)); | |
6718 | ||
6719 | else | |
6720 | gcc_unreachable (); | |
6721 | ||
6722 | gnu_pos = NULL_TREE; | |
6723 | } | |
6724 | } | |
6725 | ||
6726 | if (Is_Atomic (gnat_field)) | |
6727 | check_ok_for_atomic (gnu_field_type, gnat_field, false); | |
6728 | } | |
6729 | ||
6730 | /* If the record has rep clauses and this is the tag field, make a rep | |
6731 | clause for it as well. */ | |
6732 | else if (Has_Specified_Layout (Scope (gnat_field)) | |
6733 | && Chars (gnat_field) == Name_uTag) | |
6734 | { | |
6735 | gnu_pos = bitsize_zero_node; | |
6736 | gnu_size = TYPE_SIZE (gnu_field_type); | |
6737 | } | |
6738 | ||
6739 | else | |
6740 | gnu_pos = NULL_TREE; | |
6741 | ||
6742 | /* We need to make the size the maximum for the type if it is | |
6743 | self-referential and an unconstrained type. In that case, we can't | |
6744 | pack the field since we can't make a copy to align it. */ | |
6745 | if (TREE_CODE (gnu_field_type) == RECORD_TYPE | |
6746 | && !gnu_size | |
6747 | && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type)) | |
6748 | && !Is_Constrained (Underlying_Type (Etype (gnat_field)))) | |
6749 | { | |
6750 | gnu_size = max_size (TYPE_SIZE (gnu_field_type), true); | |
6751 | packed = 0; | |
6752 | } | |
6753 | ||
6754 | /* If a size is specified, adjust the field's type to it. */ | |
6755 | if (gnu_size) | |
6756 | { | |
839f2864 EB |
6757 | tree orig_field_type; |
6758 | ||
a1ab4c31 AC |
6759 | /* If the field's type is justified modular, we would need to remove |
6760 | the wrapper to (better) meet the layout requirements. However we | |
6761 | can do so only if the field is not aliased to preserve the unique | |
6762 | layout and if the prescribed size is not greater than that of the | |
6763 | packed array to preserve the justification. */ | |
6764 | if (!needs_strict_alignment | |
6765 | && TREE_CODE (gnu_field_type) == RECORD_TYPE | |
6766 | && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) | |
6767 | && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type)) | |
6768 | <= 0) | |
6769 | gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); | |
6770 | ||
6771 | gnu_field_type | |
6772 | = make_type_from_size (gnu_field_type, gnu_size, | |
6773 | Has_Biased_Representation (gnat_field)); | |
839f2864 EB |
6774 | |
6775 | orig_field_type = gnu_field_type; | |
a1ab4c31 | 6776 | gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field, |
afb4afcd | 6777 | false, false, definition, true); |
839f2864 EB |
6778 | |
6779 | /* If a padding record was made, declare it now since it will never be | |
6780 | declared otherwise. This is necessary to ensure that its subtrees | |
6781 | are properly marked. */ | |
6782 | if (gnu_field_type != orig_field_type | |
6783 | && !DECL_P (TYPE_NAME (gnu_field_type))) | |
6784 | create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, NULL, | |
6785 | true, debug_info_p, gnat_field); | |
a1ab4c31 AC |
6786 | } |
6787 | ||
6788 | /* Otherwise (or if there was an error), don't specify a position. */ | |
6789 | else | |
6790 | gnu_pos = NULL_TREE; | |
6791 | ||
6792 | gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE | |
6793 | || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type)); | |
6794 | ||
6795 | /* Now create the decl for the field. */ | |
da01bfee EB |
6796 | gnu_field |
6797 | = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type, | |
6798 | gnu_size, gnu_pos, packed, Is_Aliased (gnat_field)); | |
a1ab4c31 AC |
6799 | Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field)); |
6800 | TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field); | |
6801 | ||
6802 | if (Ekind (gnat_field) == E_Discriminant) | |
6803 | DECL_DISCRIMINANT_NUMBER (gnu_field) | |
6804 | = UI_To_gnu (Discriminant_Number (gnat_field), sizetype); | |
6805 | ||
6806 | return gnu_field; | |
6807 | } | |
6808 | \f | |
6809 | /* Return true if TYPE is a type with variable size, a padding type with a | |
6810 | field of variable size or is a record that has a field such a field. */ | |
6811 | ||
6812 | static bool | |
6813 | is_variable_size (tree type) | |
6814 | { | |
6815 | tree field; | |
6816 | ||
6817 | if (!TREE_CONSTANT (TYPE_SIZE (type))) | |
6818 | return true; | |
6819 | ||
315cff15 | 6820 | if (TYPE_IS_PADDING_P (type) |
a1ab4c31 AC |
6821 | && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type)))) |
6822 | return true; | |
6823 | ||
6824 | if (TREE_CODE (type) != RECORD_TYPE | |
6825 | && TREE_CODE (type) != UNION_TYPE | |
6826 | && TREE_CODE (type) != QUAL_UNION_TYPE) | |
6827 | return false; | |
6828 | ||
910ad8de | 6829 | for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
6830 | if (is_variable_size (TREE_TYPE (field))) |
6831 | return true; | |
6832 | ||
6833 | return false; | |
6834 | } | |
6835 | \f | |
6836 | /* qsort comparer for the bit positions of two record components. */ | |
6837 | ||
6838 | static int | |
6839 | compare_field_bitpos (const PTR rt1, const PTR rt2) | |
6840 | { | |
6841 | const_tree const field1 = * (const_tree const *) rt1; | |
6842 | const_tree const field2 = * (const_tree const *) rt2; | |
6843 | const int ret | |
6844 | = tree_int_cst_compare (bit_position (field1), bit_position (field2)); | |
6845 | ||
6846 | return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2)); | |
6847 | } | |
6848 | ||
8cd28148 EB |
6849 | /* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set |
6850 | the result as the field list of GNU_RECORD_TYPE and finish it up. When | |
6851 | called from gnat_to_gnu_entity during the processing of a record type | |
a6a29d0c EB |
6852 | definition, the GCC node for the parent, if any, will be the single field |
6853 | of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the | |
6854 | GNU_FIELD_LIST. The other calls to this function are recursive calls for | |
6855 | the component list of a variant and, in this case, GNU_FIELD_LIST is empty. | |
a1ab4c31 AC |
6856 | |
6857 | PACKED is 1 if this is for a packed record, -1 if this is for a record | |
6858 | with Component_Alignment of Storage_Unit, -2 if this is for a record | |
6859 | with a specified alignment. | |
6860 | ||
032d1b71 | 6861 | DEFINITION is true if we are defining this record type. |
a1ab4c31 AC |
6862 | |
6863 | P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field | |
8cd28148 EB |
6864 | with a rep clause is to be added; in this case, that is all that should |
6865 | be done with such fields. | |
a1ab4c31 | 6866 | |
032d1b71 EB |
6867 | CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying |
6868 | out the record. This means the alignment only serves to force fields to | |
6869 | be bitfields, but not to require the record to be that aligned. This is | |
6870 | used for variants. | |
6871 | ||
6872 | ALL_REP is true if a rep clause is present for all the fields. | |
a1ab4c31 | 6873 | |
032d1b71 EB |
6874 | UNCHECKED_UNION is true if we are building this type for a record with a |
6875 | Pragma Unchecked_Union. | |
a1ab4c31 | 6876 | |
032d1b71 | 6877 | DEBUG_INFO_P is true if we need to write debug information about the type. |
a1ab4c31 | 6878 | |
032d1b71 EB |
6879 | MAYBE_UNUSED is true if this type may be unused in the end; this doesn't |
6880 | mean that its contents may be unused as well, but only the container. */ | |
839f2864 | 6881 | |
a1ab4c31 AC |
6882 | |
6883 | static void | |
8cd28148 | 6884 | components_to_record (tree gnu_record_type, Node_Id gnat_component_list, |
a1ab4c31 AC |
6885 | tree gnu_field_list, int packed, bool definition, |
6886 | tree *p_gnu_rep_list, bool cancel_alignment, | |
032d1b71 EB |
6887 | bool all_rep, bool unchecked_union, bool debug_info_p, |
6888 | bool maybe_unused) | |
a1ab4c31 | 6889 | { |
a1ab4c31 | 6890 | bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type); |
8cd28148 EB |
6891 | bool layout_with_rep = false; |
6892 | Node_Id component_decl, variant_part; | |
6893 | tree gnu_our_rep_list = NULL_TREE; | |
a6a29d0c | 6894 | tree gnu_field, gnu_next, gnu_last = tree_last (gnu_field_list); |
a1ab4c31 | 6895 | |
8cd28148 EB |
6896 | /* For each component referenced in a component declaration create a GCC |
6897 | field and add it to the list, skipping pragmas in the GNAT list. */ | |
6898 | if (Present (Component_Items (gnat_component_list))) | |
6899 | for (component_decl | |
6900 | = First_Non_Pragma (Component_Items (gnat_component_list)); | |
a1ab4c31 AC |
6901 | Present (component_decl); |
6902 | component_decl = Next_Non_Pragma (component_decl)) | |
6903 | { | |
8cd28148 | 6904 | Entity_Id gnat_field = Defining_Entity (component_decl); |
a6a29d0c | 6905 | Name_Id gnat_name = Chars (gnat_field); |
a1ab4c31 | 6906 | |
a6a29d0c EB |
6907 | /* If present, the _Parent field must have been created as the single |
6908 | field of the record type. Put it before any other fields. */ | |
6909 | if (gnat_name == Name_uParent) | |
6910 | { | |
6911 | gnu_field = TYPE_FIELDS (gnu_record_type); | |
6912 | gnu_field_list = chainon (gnu_field_list, gnu_field); | |
6913 | } | |
a1ab4c31 AC |
6914 | else |
6915 | { | |
839f2864 EB |
6916 | gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed, |
6917 | definition, debug_info_p); | |
a1ab4c31 | 6918 | |
a6a29d0c EB |
6919 | /* If this is the _Tag field, put it before any other fields. */ |
6920 | if (gnat_name == Name_uTag) | |
a1ab4c31 | 6921 | gnu_field_list = chainon (gnu_field_list, gnu_field); |
a6a29d0c EB |
6922 | |
6923 | /* If this is the _Controller field, put it before the other | |
6924 | fields except for the _Tag or _Parent field. */ | |
6925 | else if (gnat_name == Name_uController && gnu_last) | |
6926 | { | |
910ad8de NF |
6927 | DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); |
6928 | DECL_CHAIN (gnu_last) = gnu_field; | |
a6a29d0c EB |
6929 | } |
6930 | ||
6931 | /* If this is a regular field, put it after the other fields. */ | |
a1ab4c31 AC |
6932 | else |
6933 | { | |
910ad8de | 6934 | DECL_CHAIN (gnu_field) = gnu_field_list; |
a1ab4c31 | 6935 | gnu_field_list = gnu_field; |
a6a29d0c EB |
6936 | if (!gnu_last) |
6937 | gnu_last = gnu_field; | |
a1ab4c31 AC |
6938 | } |
6939 | } | |
6940 | ||
2ddc34ba | 6941 | save_gnu_tree (gnat_field, gnu_field, false); |
a1ab4c31 AC |
6942 | } |
6943 | ||
6944 | /* At the end of the component list there may be a variant part. */ | |
8cd28148 | 6945 | variant_part = Variant_Part (gnat_component_list); |
a1ab4c31 AC |
6946 | |
6947 | /* We create a QUAL_UNION_TYPE for the variant part since the variants are | |
6948 | mutually exclusive and should go in the same memory. To do this we need | |
6949 | to treat each variant as a record whose elements are created from the | |
6950 | component list for the variant. So here we create the records from the | |
6951 | lists for the variants and put them all into the QUAL_UNION_TYPE. | |
6952 | If this is an Unchecked_Union, we make a UNION_TYPE instead or | |
6953 | use GNU_RECORD_TYPE if there are no fields so far. */ | |
6954 | if (Present (variant_part)) | |
6955 | { | |
0fb2335d EB |
6956 | Node_Id gnat_discr = Name (variant_part), variant; |
6957 | tree gnu_discr = gnat_to_gnu (gnat_discr); | |
a1ab4c31 AC |
6958 | tree gnu_name = TYPE_NAME (gnu_record_type); |
6959 | tree gnu_var_name | |
0fb2335d EB |
6960 | = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))), |
6961 | "XVN"); | |
6962 | tree gnu_union_type, gnu_union_name, gnu_union_field; | |
a1ab4c31 AC |
6963 | tree gnu_variant_list = NULL_TREE; |
6964 | ||
6965 | if (TREE_CODE (gnu_name) == TYPE_DECL) | |
6966 | gnu_name = DECL_NAME (gnu_name); | |
6967 | ||
0fb2335d EB |
6968 | gnu_union_name |
6969 | = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name)); | |
a1ab4c31 AC |
6970 | |
6971 | /* Reuse an enclosing union if all fields are in the variant part | |
6972 | and there is no representation clause on the record, to match | |
6973 | the layout of C unions. There is an associated check below. */ | |
6974 | if (!gnu_field_list | |
6975 | && TREE_CODE (gnu_record_type) == UNION_TYPE | |
6976 | && !TYPE_PACKED (gnu_record_type)) | |
6977 | gnu_union_type = gnu_record_type; | |
6978 | else | |
6979 | { | |
6980 | gnu_union_type | |
6981 | = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE); | |
6982 | ||
6983 | TYPE_NAME (gnu_union_type) = gnu_union_name; | |
6984 | TYPE_ALIGN (gnu_union_type) = 0; | |
6985 | TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type); | |
6986 | } | |
6987 | ||
6988 | for (variant = First_Non_Pragma (Variants (variant_part)); | |
6989 | Present (variant); | |
6990 | variant = Next_Non_Pragma (variant)) | |
6991 | { | |
6992 | tree gnu_variant_type = make_node (RECORD_TYPE); | |
6993 | tree gnu_inner_name; | |
6994 | tree gnu_qual; | |
6995 | ||
6996 | Get_Variant_Encoding (variant); | |
0fb2335d | 6997 | gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len); |
a1ab4c31 | 6998 | TYPE_NAME (gnu_variant_type) |
0fb2335d EB |
6999 | = concat_name (gnu_union_name, |
7000 | IDENTIFIER_POINTER (gnu_inner_name)); | |
a1ab4c31 AC |
7001 | |
7002 | /* Set the alignment of the inner type in case we need to make | |
8cd28148 EB |
7003 | inner objects into bitfields, but then clear it out so the |
7004 | record actually gets only the alignment required. */ | |
a1ab4c31 AC |
7005 | TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type); |
7006 | TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type); | |
7007 | ||
8cd28148 EB |
7008 | /* Similarly, if the outer record has a size specified and all |
7009 | fields have record rep clauses, we can propagate the size | |
7010 | into the variant part. */ | |
a1ab4c31 AC |
7011 | if (all_rep_and_size) |
7012 | { | |
7013 | TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type); | |
7014 | TYPE_SIZE_UNIT (gnu_variant_type) | |
7015 | = TYPE_SIZE_UNIT (gnu_record_type); | |
7016 | } | |
7017 | ||
032d1b71 EB |
7018 | /* Add the fields into the record type for the variant. Note that |
7019 | we aren't sure to really use it at this point, see below. */ | |
a1ab4c31 AC |
7020 | components_to_record (gnu_variant_type, Component_List (variant), |
7021 | NULL_TREE, packed, definition, | |
7022 | &gnu_our_rep_list, !all_rep_and_size, all_rep, | |
032d1b71 | 7023 | unchecked_union, debug_info_p, true); |
a1ab4c31 | 7024 | |
0fb2335d | 7025 | gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant)); |
a1ab4c31 AC |
7026 | |
7027 | Set_Present_Expr (variant, annotate_value (gnu_qual)); | |
7028 | ||
7029 | /* If this is an Unchecked_Union and we have exactly one field, | |
7030 | use this field directly to match the layout of C unions. */ | |
7031 | if (unchecked_union | |
7032 | && TYPE_FIELDS (gnu_variant_type) | |
910ad8de | 7033 | && !DECL_CHAIN (TYPE_FIELDS (gnu_variant_type))) |
a1ab4c31 AC |
7034 | gnu_field = TYPE_FIELDS (gnu_variant_type); |
7035 | else | |
7036 | { | |
7037 | /* Deal with packedness like in gnat_to_gnu_field. */ | |
7038 | int field_packed | |
7039 | = adjust_packed (gnu_variant_type, gnu_record_type, packed); | |
7040 | ||
7041 | /* Finalize the record type now. We used to throw away | |
7042 | empty records but we no longer do that because we need | |
7043 | them to generate complete debug info for the variant; | |
7044 | otherwise, the union type definition will be lacking | |
7045 | the fields associated with these empty variants. */ | |
7046 | rest_of_record_type_compilation (gnu_variant_type); | |
95c1c4bb EB |
7047 | create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type, |
7048 | NULL, true, debug_info_p, gnat_component_list); | |
a1ab4c31 | 7049 | |
da01bfee EB |
7050 | gnu_field |
7051 | = create_field_decl (gnu_inner_name, gnu_variant_type, | |
7052 | gnu_union_type, | |
7053 | all_rep_and_size | |
7054 | ? TYPE_SIZE (gnu_variant_type) : 0, | |
7055 | all_rep_and_size | |
7056 | ? bitsize_zero_node : 0, | |
7057 | field_packed, 0); | |
a1ab4c31 AC |
7058 | |
7059 | DECL_INTERNAL_P (gnu_field) = 1; | |
7060 | ||
7061 | if (!unchecked_union) | |
7062 | DECL_QUALIFIER (gnu_field) = gnu_qual; | |
7063 | } | |
7064 | ||
910ad8de | 7065 | DECL_CHAIN (gnu_field) = gnu_variant_list; |
a1ab4c31 AC |
7066 | gnu_variant_list = gnu_field; |
7067 | } | |
7068 | ||
8cd28148 | 7069 | /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */ |
a1ab4c31 AC |
7070 | if (gnu_variant_list) |
7071 | { | |
7072 | int union_field_packed; | |
7073 | ||
7074 | if (all_rep_and_size) | |
7075 | { | |
7076 | TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type); | |
7077 | TYPE_SIZE_UNIT (gnu_union_type) | |
7078 | = TYPE_SIZE_UNIT (gnu_record_type); | |
7079 | } | |
7080 | ||
7081 | finish_record_type (gnu_union_type, nreverse (gnu_variant_list), | |
032d1b71 | 7082 | all_rep_and_size ? 1 : 0, debug_info_p); |
a1ab4c31 AC |
7083 | |
7084 | /* If GNU_UNION_TYPE is our record type, it means we must have an | |
7085 | Unchecked_Union with no fields. Verify that and, if so, just | |
7086 | return. */ | |
7087 | if (gnu_union_type == gnu_record_type) | |
7088 | { | |
7089 | gcc_assert (unchecked_union | |
7090 | && !gnu_field_list | |
7091 | && !gnu_our_rep_list); | |
7092 | return; | |
7093 | } | |
7094 | ||
95c1c4bb EB |
7095 | create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type, |
7096 | NULL, true, debug_info_p, gnat_component_list); | |
7097 | ||
a1ab4c31 AC |
7098 | /* Deal with packedness like in gnat_to_gnu_field. */ |
7099 | union_field_packed | |
7100 | = adjust_packed (gnu_union_type, gnu_record_type, packed); | |
7101 | ||
7102 | gnu_union_field | |
7103 | = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type, | |
a1ab4c31 | 7104 | all_rep ? TYPE_SIZE (gnu_union_type) : 0, |
da01bfee EB |
7105 | all_rep ? bitsize_zero_node : 0, |
7106 | union_field_packed, 0); | |
a1ab4c31 AC |
7107 | |
7108 | DECL_INTERNAL_P (gnu_union_field) = 1; | |
910ad8de | 7109 | DECL_CHAIN (gnu_union_field) = gnu_field_list; |
a1ab4c31 AC |
7110 | gnu_field_list = gnu_union_field; |
7111 | } | |
7112 | } | |
7113 | ||
7114 | /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they | |
8cd28148 EB |
7115 | do, pull them out and put them into GNU_OUR_REP_LIST. We have to do |
7116 | this in a separate pass since we want to handle the discriminants but | |
7117 | can't play with them until we've used them in debugging data above. | |
7118 | ||
7119 | ??? If we then reorder them, debugging information will be wrong but | |
7120 | there's nothing that can be done about this at the moment. */ | |
7121 | gnu_last = NULL_TREE; | |
7122 | for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next) | |
a1ab4c31 | 7123 | { |
910ad8de | 7124 | gnu_next = DECL_CHAIN (gnu_field); |
8cd28148 | 7125 | |
a1ab4c31 AC |
7126 | if (DECL_FIELD_OFFSET (gnu_field)) |
7127 | { | |
a1ab4c31 AC |
7128 | if (!gnu_last) |
7129 | gnu_field_list = gnu_next; | |
7130 | else | |
910ad8de | 7131 | DECL_CHAIN (gnu_last) = gnu_next; |
a1ab4c31 | 7132 | |
910ad8de | 7133 | DECL_CHAIN (gnu_field) = gnu_our_rep_list; |
a1ab4c31 | 7134 | gnu_our_rep_list = gnu_field; |
a1ab4c31 AC |
7135 | } |
7136 | else | |
8cd28148 | 7137 | gnu_last = gnu_field; |
a1ab4c31 AC |
7138 | } |
7139 | ||
8cd28148 EB |
7140 | /* If we have any fields in our rep'ed field list and it is not the case that |
7141 | all the fields in the record have rep clauses and P_REP_LIST is nonzero, | |
7142 | set it and ignore these fields. */ | |
a1ab4c31 AC |
7143 | if (gnu_our_rep_list && p_gnu_rep_list && !all_rep) |
7144 | *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list); | |
8cd28148 EB |
7145 | |
7146 | /* Otherwise, sort the fields by bit position and put them into their own | |
7147 | record, before the others, if we also have fields without rep clauses. */ | |
a1ab4c31 AC |
7148 | else if (gnu_our_rep_list) |
7149 | { | |
a1ab4c31 AC |
7150 | tree gnu_rep_type |
7151 | = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type); | |
8cd28148 | 7152 | int i, len = list_length (gnu_our_rep_list); |
a1ab4c31 | 7153 | tree *gnu_arr = (tree *) alloca (sizeof (tree) * len); |
a1ab4c31 | 7154 | |
8cd28148 EB |
7155 | for (gnu_field = gnu_our_rep_list, i = 0; |
7156 | gnu_field; | |
910ad8de | 7157 | gnu_field = DECL_CHAIN (gnu_field), i++) |
a1ab4c31 AC |
7158 | gnu_arr[i] = gnu_field; |
7159 | ||
7160 | qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos); | |
7161 | ||
7162 | /* Put the fields in the list in order of increasing position, which | |
7163 | means we start from the end. */ | |
7164 | gnu_our_rep_list = NULL_TREE; | |
7165 | for (i = len - 1; i >= 0; i--) | |
7166 | { | |
910ad8de | 7167 | DECL_CHAIN (gnu_arr[i]) = gnu_our_rep_list; |
a1ab4c31 AC |
7168 | gnu_our_rep_list = gnu_arr[i]; |
7169 | DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type; | |
7170 | } | |
7171 | ||
7172 | if (gnu_field_list) | |
7173 | { | |
032d1b71 | 7174 | finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, debug_info_p); |
8cd28148 EB |
7175 | gnu_field |
7176 | = create_field_decl (get_identifier ("REP"), gnu_rep_type, | |
da01bfee | 7177 | gnu_record_type, NULL_TREE, NULL_TREE, 0, 1); |
a1ab4c31 AC |
7178 | DECL_INTERNAL_P (gnu_field) = 1; |
7179 | gnu_field_list = chainon (gnu_field_list, gnu_field); | |
7180 | } | |
7181 | else | |
7182 | { | |
7183 | layout_with_rep = true; | |
7184 | gnu_field_list = nreverse (gnu_our_rep_list); | |
7185 | } | |
7186 | } | |
7187 | ||
7188 | if (cancel_alignment) | |
7189 | TYPE_ALIGN (gnu_record_type) = 0; | |
7190 | ||
7191 | finish_record_type (gnu_record_type, nreverse (gnu_field_list), | |
032d1b71 | 7192 | layout_with_rep ? 1 : 0, debug_info_p && !maybe_unused); |
a1ab4c31 AC |
7193 | } |
7194 | \f | |
7195 | /* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be | |
7196 | placed into an Esize, Component_Bit_Offset, or Component_Size value | |
7197 | in the GNAT tree. */ | |
7198 | ||
7199 | static Uint | |
7200 | annotate_value (tree gnu_size) | |
7201 | { | |
a1ab4c31 AC |
7202 | TCode tcode; |
7203 | Node_Ref_Or_Val ops[3], ret; | |
a1ab4c31 | 7204 | struct tree_int_map **h = NULL; |
586388fd | 7205 | int i; |
a1ab4c31 AC |
7206 | |
7207 | /* See if we've already saved the value for this node. */ | |
7208 | if (EXPR_P (gnu_size)) | |
7209 | { | |
7210 | struct tree_int_map in; | |
7211 | if (!annotate_value_cache) | |
7212 | annotate_value_cache = htab_create_ggc (512, tree_int_map_hash, | |
7213 | tree_int_map_eq, 0); | |
7214 | in.base.from = gnu_size; | |
7215 | h = (struct tree_int_map **) | |
7216 | htab_find_slot (annotate_value_cache, &in, INSERT); | |
7217 | ||
7218 | if (*h) | |
7219 | return (Node_Ref_Or_Val) (*h)->to; | |
7220 | } | |
7221 | ||
7222 | /* If we do not return inside this switch, TCODE will be set to the | |
7223 | code to use for a Create_Node operand and LEN (set above) will be | |
7224 | the number of recursive calls for us to make. */ | |
7225 | ||
7226 | switch (TREE_CODE (gnu_size)) | |
7227 | { | |
7228 | case INTEGER_CST: | |
7229 | if (TREE_OVERFLOW (gnu_size)) | |
7230 | return No_Uint; | |
7231 | ||
1081f5a7 EB |
7232 | /* This may come from a conversion from some smaller type, so ensure |
7233 | this is in bitsizetype. */ | |
a1ab4c31 AC |
7234 | gnu_size = convert (bitsizetype, gnu_size); |
7235 | ||
728936bb EB |
7236 | /* For a negative value, build NEGATE_EXPR of the opposite. Such values |
7237 | appear in expressions containing aligning patterns. Note that, since | |
7238 | sizetype is sign-extended but nonetheless unsigned, we don't directly | |
7239 | use tree_int_cst_sgn. */ | |
7240 | if (TREE_INT_CST_HIGH (gnu_size) < 0) | |
a1ab4c31 | 7241 | { |
1081f5a7 EB |
7242 | tree op_size = fold_build1 (NEGATE_EXPR, bitsizetype, gnu_size); |
7243 | return annotate_value (build1 (NEGATE_EXPR, bitsizetype, op_size)); | |
a1ab4c31 AC |
7244 | } |
7245 | ||
586388fd | 7246 | return UI_From_gnu (gnu_size); |
a1ab4c31 AC |
7247 | |
7248 | case COMPONENT_REF: | |
7249 | /* The only case we handle here is a simple discriminant reference. */ | |
7250 | if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR | |
7251 | && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL | |
7252 | && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1))) | |
7253 | return Create_Node (Discrim_Val, | |
7254 | annotate_value (DECL_DISCRIMINANT_NUMBER | |
7255 | (TREE_OPERAND (gnu_size, 1))), | |
7256 | No_Uint, No_Uint); | |
7257 | else | |
7258 | return No_Uint; | |
7259 | ||
7260 | CASE_CONVERT: case NON_LVALUE_EXPR: | |
7261 | return annotate_value (TREE_OPERAND (gnu_size, 0)); | |
7262 | ||
7263 | /* Now just list the operations we handle. */ | |
7264 | case COND_EXPR: tcode = Cond_Expr; break; | |
7265 | case PLUS_EXPR: tcode = Plus_Expr; break; | |
7266 | case MINUS_EXPR: tcode = Minus_Expr; break; | |
7267 | case MULT_EXPR: tcode = Mult_Expr; break; | |
7268 | case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break; | |
7269 | case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break; | |
7270 | case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break; | |
7271 | case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break; | |
7272 | case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break; | |
7273 | case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break; | |
7274 | case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break; | |
7275 | case NEGATE_EXPR: tcode = Negate_Expr; break; | |
7276 | case MIN_EXPR: tcode = Min_Expr; break; | |
7277 | case MAX_EXPR: tcode = Max_Expr; break; | |
7278 | case ABS_EXPR: tcode = Abs_Expr; break; | |
7279 | case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break; | |
7280 | case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break; | |
7281 | case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break; | |
7282 | case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break; | |
7283 | case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break; | |
7284 | case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break; | |
7285 | case BIT_AND_EXPR: tcode = Bit_And_Expr; break; | |
7286 | case LT_EXPR: tcode = Lt_Expr; break; | |
7287 | case LE_EXPR: tcode = Le_Expr; break; | |
7288 | case GT_EXPR: tcode = Gt_Expr; break; | |
7289 | case GE_EXPR: tcode = Ge_Expr; break; | |
7290 | case EQ_EXPR: tcode = Eq_Expr; break; | |
7291 | case NE_EXPR: tcode = Ne_Expr; break; | |
7292 | ||
f82a627c EB |
7293 | case CALL_EXPR: |
7294 | { | |
7295 | tree t = maybe_inline_call_in_expr (gnu_size); | |
7296 | if (t) | |
7297 | return annotate_value (t); | |
7298 | } | |
7299 | ||
7300 | /* Fall through... */ | |
7301 | ||
a1ab4c31 AC |
7302 | default: |
7303 | return No_Uint; | |
7304 | } | |
7305 | ||
7306 | /* Now get each of the operands that's relevant for this code. If any | |
7307 | cannot be expressed as a repinfo node, say we can't. */ | |
7308 | for (i = 0; i < 3; i++) | |
7309 | ops[i] = No_Uint; | |
7310 | ||
58c8f770 | 7311 | for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (gnu_size)); i++) |
a1ab4c31 AC |
7312 | { |
7313 | ops[i] = annotate_value (TREE_OPERAND (gnu_size, i)); | |
7314 | if (ops[i] == No_Uint) | |
7315 | return No_Uint; | |
7316 | } | |
7317 | ||
7318 | ret = Create_Node (tcode, ops[0], ops[1], ops[2]); | |
7319 | ||
7320 | /* Save the result in the cache. */ | |
7321 | if (h) | |
7322 | { | |
a9429e29 | 7323 | *h = ggc_alloc_tree_int_map (); |
a1ab4c31 AC |
7324 | (*h)->base.from = gnu_size; |
7325 | (*h)->to = ret; | |
7326 | } | |
7327 | ||
7328 | return ret; | |
7329 | } | |
7330 | ||
f4cd2542 EB |
7331 | /* Given GNAT_ENTITY, an object (constant, variable, parameter, exception) |
7332 | and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the | |
7333 | size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null. | |
7334 | BY_REF is true if the object is used by reference. */ | |
7335 | ||
7336 | void | |
7337 | annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref) | |
7338 | { | |
7339 | if (by_ref) | |
7340 | { | |
315cff15 | 7341 | if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
f4cd2542 EB |
7342 | gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type); |
7343 | else | |
7344 | gnu_type = TREE_TYPE (gnu_type); | |
7345 | } | |
7346 | ||
7347 | if (Unknown_Esize (gnat_entity)) | |
7348 | { | |
7349 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
7350 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
910ad8de | 7351 | size = TYPE_SIZE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))); |
f4cd2542 EB |
7352 | else if (!size) |
7353 | size = TYPE_SIZE (gnu_type); | |
7354 | ||
7355 | if (size) | |
7356 | Set_Esize (gnat_entity, annotate_value (size)); | |
7357 | } | |
7358 | ||
7359 | if (Unknown_Alignment (gnat_entity)) | |
7360 | Set_Alignment (gnat_entity, | |
7361 | UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); | |
7362 | } | |
7363 | ||
cb3d597d EB |
7364 | /* Return first element of field list whose TREE_PURPOSE is the same as ELEM. |
7365 | Return NULL_TREE if there is no such element in the list. */ | |
73d28034 EB |
7366 | |
7367 | static tree | |
7368 | purpose_member_field (const_tree elem, tree list) | |
7369 | { | |
7370 | while (list) | |
7371 | { | |
7372 | tree field = TREE_PURPOSE (list); | |
cb3d597d | 7373 | if (SAME_FIELD_P (field, elem)) |
73d28034 EB |
7374 | return list; |
7375 | list = TREE_CHAIN (list); | |
7376 | } | |
7377 | return NULL_TREE; | |
7378 | } | |
7379 | ||
3f13dd77 EB |
7380 | /* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type, |
7381 | set Component_Bit_Offset and Esize of the components to the position and | |
7382 | size used by Gigi. */ | |
a1ab4c31 AC |
7383 | |
7384 | static void | |
7385 | annotate_rep (Entity_Id gnat_entity, tree gnu_type) | |
7386 | { | |
a1ab4c31 | 7387 | Entity_Id gnat_field; |
3f13dd77 | 7388 | tree gnu_list; |
a1ab4c31 | 7389 | |
3f13dd77 EB |
7390 | /* We operate by first making a list of all fields and their position (we |
7391 | can get the size easily) and then update all the sizes in the tree. */ | |
95c1c4bb EB |
7392 | gnu_list |
7393 | = build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node, | |
7394 | BIGGEST_ALIGNMENT, NULL_TREE); | |
a1ab4c31 | 7395 | |
3f13dd77 EB |
7396 | for (gnat_field = First_Entity (gnat_entity); |
7397 | Present (gnat_field); | |
a1ab4c31 | 7398 | gnat_field = Next_Entity (gnat_field)) |
3f13dd77 EB |
7399 | if (Ekind (gnat_field) == E_Component |
7400 | || (Ekind (gnat_field) == E_Discriminant | |
7401 | && !Is_Unchecked_Union (Scope (gnat_field)))) | |
a1ab4c31 | 7402 | { |
73d28034 EB |
7403 | tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field), |
7404 | gnu_list); | |
3f13dd77 | 7405 | if (t) |
a1ab4c31 | 7406 | { |
73d28034 EB |
7407 | tree parent_offset; |
7408 | ||
a1ab4c31 AC |
7409 | if (type_annotate_only && Is_Tagged_Type (gnat_entity)) |
7410 | { | |
3f13dd77 | 7411 | /* In this mode the tag and parent components are not |
a1ab4c31 AC |
7412 | generated, so we add the appropriate offset to each |
7413 | component. For a component appearing in the current | |
7414 | extension, the offset is the size of the parent. */ | |
3f13dd77 EB |
7415 | if (Is_Derived_Type (gnat_entity) |
7416 | && Original_Record_Component (gnat_field) == gnat_field) | |
7417 | parent_offset | |
7418 | = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))), | |
7419 | bitsizetype); | |
7420 | else | |
7421 | parent_offset = bitsize_int (POINTER_SIZE); | |
a1ab4c31 | 7422 | } |
3f13dd77 EB |
7423 | else |
7424 | parent_offset = bitsize_zero_node; | |
a1ab4c31 | 7425 | |
3f13dd77 EB |
7426 | Set_Component_Bit_Offset |
7427 | (gnat_field, | |
7428 | annotate_value | |
7429 | (size_binop (PLUS_EXPR, | |
95c1c4bb EB |
7430 | bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0), |
7431 | TREE_VEC_ELT (TREE_VALUE (t), 2)), | |
3f13dd77 | 7432 | parent_offset))); |
a1ab4c31 AC |
7433 | |
7434 | Set_Esize (gnat_field, | |
3f13dd77 | 7435 | annotate_value (DECL_SIZE (TREE_PURPOSE (t)))); |
a1ab4c31 | 7436 | } |
3f13dd77 | 7437 | else if (Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity)) |
a1ab4c31 | 7438 | { |
3f13dd77 | 7439 | /* If there is no entry, this is an inherited component whose |
a1ab4c31 AC |
7440 | position is the same as in the parent type. */ |
7441 | Set_Component_Bit_Offset | |
7442 | (gnat_field, | |
7443 | Component_Bit_Offset (Original_Record_Component (gnat_field))); | |
3f13dd77 | 7444 | |
a1ab4c31 AC |
7445 | Set_Esize (gnat_field, |
7446 | Esize (Original_Record_Component (gnat_field))); | |
7447 | } | |
7448 | } | |
7449 | } | |
3f13dd77 | 7450 | \f |
95c1c4bb EB |
7451 | /* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is |
7452 | the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the | |
7453 | value to be placed into DECL_OFFSET_ALIGN and the bit position. The list | |
7454 | of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT | |
7455 | is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the | |
7456 | bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a | |
7457 | pre-existing list to be chained to the newly created entries. */ | |
a1ab4c31 AC |
7458 | |
7459 | static tree | |
95c1c4bb EB |
7460 | build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos, |
7461 | tree gnu_bitpos, unsigned int offset_align, tree gnu_list) | |
a1ab4c31 AC |
7462 | { |
7463 | tree gnu_field; | |
a1ab4c31 | 7464 | |
3f13dd77 EB |
7465 | for (gnu_field = TYPE_FIELDS (gnu_type); |
7466 | gnu_field; | |
910ad8de | 7467 | gnu_field = DECL_CHAIN (gnu_field)) |
a1ab4c31 AC |
7468 | { |
7469 | tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos, | |
7470 | DECL_FIELD_BIT_OFFSET (gnu_field)); | |
7471 | tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos, | |
7472 | DECL_FIELD_OFFSET (gnu_field)); | |
7473 | unsigned int our_offset_align | |
7474 | = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field)); | |
95c1c4bb | 7475 | tree v = make_tree_vec (3); |
a1ab4c31 | 7476 | |
95c1c4bb EB |
7477 | TREE_VEC_ELT (v, 0) = gnu_our_offset; |
7478 | TREE_VEC_ELT (v, 1) = size_int (our_offset_align); | |
7479 | TREE_VEC_ELT (v, 2) = gnu_our_bitpos; | |
7480 | gnu_list = tree_cons (gnu_field, v, gnu_list); | |
a1ab4c31 | 7481 | |
95c1c4bb EB |
7482 | /* Recurse on internal fields, flattening the nested fields except for |
7483 | those in the variant part, if requested. */ | |
a1ab4c31 | 7484 | if (DECL_INTERNAL_P (gnu_field)) |
95c1c4bb EB |
7485 | { |
7486 | tree gnu_field_type = TREE_TYPE (gnu_field); | |
7487 | if (do_not_flatten_variant | |
7488 | && TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE) | |
7489 | gnu_list | |
7490 | = build_position_list (gnu_field_type, do_not_flatten_variant, | |
7491 | size_zero_node, bitsize_zero_node, | |
7492 | BIGGEST_ALIGNMENT, gnu_list); | |
7493 | else | |
7494 | gnu_list | |
7495 | = build_position_list (gnu_field_type, do_not_flatten_variant, | |
a1ab4c31 | 7496 | gnu_our_offset, gnu_our_bitpos, |
95c1c4bb EB |
7497 | our_offset_align, gnu_list); |
7498 | } | |
7499 | } | |
7500 | ||
7501 | return gnu_list; | |
7502 | } | |
7503 | ||
7504 | /* Return a TREE_LIST describing the substitutions needed to reflect the | |
7505 | discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can | |
7506 | be in any order. TREE_PURPOSE gives the tree for the discriminant and | |
7507 | TREE_VALUE is the replacement value. They are in the form of operands | |
7508 | to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for a definition | |
7509 | of GNAT_SUBTYPE. */ | |
7510 | ||
7511 | static tree | |
7512 | build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition) | |
7513 | { | |
7514 | tree gnu_list = NULL_TREE; | |
7515 | Entity_Id gnat_discrim; | |
7516 | Node_Id gnat_value; | |
7517 | ||
7518 | for (gnat_discrim = First_Stored_Discriminant (gnat_type), | |
7519 | gnat_value = First_Elmt (Stored_Constraint (gnat_subtype)); | |
7520 | Present (gnat_discrim); | |
7521 | gnat_discrim = Next_Stored_Discriminant (gnat_discrim), | |
7522 | gnat_value = Next_Elmt (gnat_value)) | |
7523 | /* Ignore access discriminants. */ | |
7524 | if (!Is_Access_Type (Etype (Node (gnat_value)))) | |
3c28a5f4 EB |
7525 | { |
7526 | tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim); | |
7527 | gnu_list = tree_cons (gnu_field, | |
7528 | convert (TREE_TYPE (gnu_field), | |
7529 | elaborate_expression | |
7530 | (Node (gnat_value), gnat_subtype, | |
7531 | get_entity_name (gnat_discrim), | |
7532 | definition, true, false)), | |
7533 | gnu_list); | |
7534 | } | |
95c1c4bb EB |
7535 | |
7536 | return gnu_list; | |
7537 | } | |
7538 | ||
7539 | /* Scan all fields in QUAL_UNION_TYPE and return a TREE_LIST describing the | |
7540 | variants of QUAL_UNION_TYPE that are still relevant after applying the | |
7541 | substitutions described in SUBST_LIST. TREE_PURPOSE is the type of the | |
7542 | variant and TREE_VALUE is a TREE_VEC containing the field, the new value | |
7543 | of the qualifier and NULL_TREE respectively. GNU_LIST is a pre-existing | |
7544 | list to be chained to the newly created entries. */ | |
7545 | ||
7546 | static tree | |
7547 | build_variant_list (tree qual_union_type, tree subst_list, tree gnu_list) | |
7548 | { | |
7549 | tree gnu_field; | |
7550 | ||
7551 | for (gnu_field = TYPE_FIELDS (qual_union_type); | |
7552 | gnu_field; | |
910ad8de | 7553 | gnu_field = DECL_CHAIN (gnu_field)) |
95c1c4bb EB |
7554 | { |
7555 | tree t, qual = DECL_QUALIFIER (gnu_field); | |
7556 | ||
7557 | for (t = subst_list; t; t = TREE_CHAIN (t)) | |
7558 | qual = SUBSTITUTE_IN_EXPR (qual, TREE_PURPOSE (t), TREE_VALUE (t)); | |
7559 | ||
7560 | /* If the new qualifier is not unconditionally false, its variant may | |
7561 | still be accessed. */ | |
7562 | if (!integer_zerop (qual)) | |
7563 | { | |
7564 | tree variant_type = TREE_TYPE (gnu_field), variant_subpart; | |
7565 | tree v = make_tree_vec (3); | |
7566 | TREE_VEC_ELT (v, 0) = gnu_field; | |
7567 | TREE_VEC_ELT (v, 1) = qual; | |
7568 | TREE_VEC_ELT (v, 2) = NULL_TREE; | |
7569 | gnu_list = tree_cons (variant_type, v, gnu_list); | |
7570 | ||
7571 | /* Recurse on the variant subpart of the variant, if any. */ | |
7572 | variant_subpart = get_variant_part (variant_type); | |
7573 | if (variant_subpart) | |
7574 | gnu_list = build_variant_list (TREE_TYPE (variant_subpart), | |
7575 | subst_list, gnu_list); | |
7576 | ||
7577 | /* If the new qualifier is unconditionally true, the subsequent | |
7578 | variants cannot be accessed. */ | |
7579 | if (integer_onep (qual)) | |
7580 | break; | |
7581 | } | |
a1ab4c31 AC |
7582 | } |
7583 | ||
3f13dd77 | 7584 | return gnu_list; |
a1ab4c31 AC |
7585 | } |
7586 | \f | |
7587 | /* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE | |
7588 | corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding | |
7589 | to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying | |
7590 | the size for an object, TYPE_DECL for the size of a type, and FIELD_DECL | |
7591 | for the size of a field. COMPONENT_P is true if we are being called | |
7592 | to process the Component_Size of GNAT_OBJECT. This is used for error | |
7593 | message handling and to indicate to use the object size of GNU_TYPE. | |
7594 | ZERO_OK is true if a size of zero is permitted; if ZERO_OK is false, | |
7595 | it means that a size of zero should be treated as an unspecified size. */ | |
7596 | ||
7597 | static tree | |
7598 | validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object, | |
7599 | enum tree_code kind, bool component_p, bool zero_ok) | |
7600 | { | |
7601 | Node_Id gnat_error_node; | |
7602 | tree type_size, size; | |
7603 | ||
8ff6c664 EB |
7604 | /* Return 0 if no size was specified. */ |
7605 | if (uint_size == No_Uint) | |
7606 | return NULL_TREE; | |
a1ab4c31 | 7607 | |
728936bb EB |
7608 | /* Ignore a negative size since that corresponds to our back-annotation. */ |
7609 | if (UI_Lt (uint_size, Uint_0)) | |
7610 | return NULL_TREE; | |
7611 | ||
a1ab4c31 AC |
7612 | /* Find the node to use for errors. */ |
7613 | if ((Ekind (gnat_object) == E_Component | |
7614 | || Ekind (gnat_object) == E_Discriminant) | |
7615 | && Present (Component_Clause (gnat_object))) | |
7616 | gnat_error_node = Last_Bit (Component_Clause (gnat_object)); | |
7617 | else if (Present (Size_Clause (gnat_object))) | |
7618 | gnat_error_node = Expression (Size_Clause (gnat_object)); | |
7619 | else | |
7620 | gnat_error_node = gnat_object; | |
7621 | ||
a8e05f92 EB |
7622 | /* Get the size as a tree. Issue an error if a size was specified but |
7623 | cannot be represented in sizetype. */ | |
a1ab4c31 AC |
7624 | size = UI_To_gnu (uint_size, bitsizetype); |
7625 | if (TREE_OVERFLOW (size)) | |
7626 | { | |
8ff6c664 EB |
7627 | if (component_p) |
7628 | post_error_ne ("component size of & is too large", gnat_error_node, | |
7629 | gnat_object); | |
7630 | else | |
7631 | post_error_ne ("size of & is too large", gnat_error_node, | |
7632 | gnat_object); | |
a1ab4c31 AC |
7633 | return NULL_TREE; |
7634 | } | |
7635 | ||
728936bb EB |
7636 | /* Ignore a zero size if it is not permitted. */ |
7637 | if (!zero_ok && integer_zerop (size)) | |
a1ab4c31 AC |
7638 | return NULL_TREE; |
7639 | ||
7640 | /* The size of objects is always a multiple of a byte. */ | |
7641 | if (kind == VAR_DECL | |
7642 | && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node))) | |
7643 | { | |
7644 | if (component_p) | |
7645 | post_error_ne ("component size for& is not a multiple of Storage_Unit", | |
7646 | gnat_error_node, gnat_object); | |
7647 | else | |
7648 | post_error_ne ("size for& is not a multiple of Storage_Unit", | |
7649 | gnat_error_node, gnat_object); | |
7650 | return NULL_TREE; | |
7651 | } | |
7652 | ||
7653 | /* If this is an integral type or a packed array type, the front-end has | |
7654 | verified the size, so we need not do it here (which would entail | |
a8e05f92 EB |
7655 | checking against the bounds). However, if this is an aliased object, |
7656 | it may not be smaller than the type of the object. */ | |
a1ab4c31 AC |
7657 | if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type)) |
7658 | && !(kind == VAR_DECL && Is_Aliased (gnat_object))) | |
7659 | return size; | |
7660 | ||
7661 | /* If the object is a record that contains a template, add the size of | |
7662 | the template to the specified size. */ | |
7663 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
7664 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
7665 | size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size); | |
7666 | ||
8ff6c664 EB |
7667 | if (kind == VAR_DECL |
7668 | /* If a type needs strict alignment, a component of this type in | |
7669 | a packed record cannot be packed and thus uses the type size. */ | |
7670 | || (kind == TYPE_DECL && Strict_Alignment (gnat_object))) | |
7671 | type_size = TYPE_SIZE (gnu_type); | |
7672 | else | |
7673 | type_size = rm_size (gnu_type); | |
7674 | ||
a1ab4c31 AC |
7675 | /* Modify the size of the type to be that of the maximum size if it has a |
7676 | discriminant. */ | |
7677 | if (type_size && CONTAINS_PLACEHOLDER_P (type_size)) | |
7678 | type_size = max_size (type_size, true); | |
7679 | ||
7680 | /* If this is an access type or a fat pointer, the minimum size is that given | |
7681 | by the smallest integral mode that's valid for pointers. */ | |
315cff15 | 7682 | if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type)) |
a1ab4c31 | 7683 | { |
8ff6c664 EB |
7684 | enum machine_mode p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT); |
7685 | while (!targetm.valid_pointer_mode (p_mode)) | |
7686 | p_mode = GET_MODE_WIDER_MODE (p_mode); | |
a1ab4c31 AC |
7687 | type_size = bitsize_int (GET_MODE_BITSIZE (p_mode)); |
7688 | } | |
7689 | ||
7690 | /* If the size of the object is a constant, the new size must not be | |
7691 | smaller. */ | |
7692 | if (TREE_CODE (type_size) != INTEGER_CST | |
7693 | || TREE_OVERFLOW (type_size) | |
7694 | || tree_int_cst_lt (size, type_size)) | |
7695 | { | |
7696 | if (component_p) | |
7697 | post_error_ne_tree | |
7698 | ("component size for& too small{, minimum allowed is ^}", | |
7699 | gnat_error_node, gnat_object, type_size); | |
7700 | else | |
8ff6c664 EB |
7701 | post_error_ne_tree |
7702 | ("size for& too small{, minimum allowed is ^}", | |
7703 | gnat_error_node, gnat_object, type_size); | |
a1ab4c31 | 7704 | |
8ff6c664 | 7705 | size = NULL_TREE; |
a1ab4c31 AC |
7706 | } |
7707 | ||
7708 | return size; | |
7709 | } | |
7710 | \f | |
b4680ca1 | 7711 | /* Similarly, but both validate and process a value of RM size. This |
a1ab4c31 AC |
7712 | routine is only called for types. */ |
7713 | ||
7714 | static void | |
7715 | set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity) | |
7716 | { | |
8ff6c664 EB |
7717 | Node_Id gnat_attr_node; |
7718 | tree old_size, size; | |
7719 | ||
7720 | /* Do nothing if no size was specified. */ | |
7721 | if (uint_size == No_Uint) | |
7722 | return; | |
7723 | ||
728936bb EB |
7724 | /* Ignore a negative size since that corresponds to our back-annotation. */ |
7725 | if (UI_Lt (uint_size, Uint_0)) | |
7726 | return; | |
7727 | ||
a8e05f92 | 7728 | /* Only issue an error if a Value_Size clause was explicitly given. |
a1ab4c31 | 7729 | Otherwise, we'd be duplicating an error on the Size clause. */ |
8ff6c664 | 7730 | gnat_attr_node |
a1ab4c31 | 7731 | = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size); |
a1ab4c31 | 7732 | |
a8e05f92 EB |
7733 | /* Get the size as a tree. Issue an error if a size was specified but |
7734 | cannot be represented in sizetype. */ | |
a1ab4c31 AC |
7735 | size = UI_To_gnu (uint_size, bitsizetype); |
7736 | if (TREE_OVERFLOW (size)) | |
7737 | { | |
7738 | if (Present (gnat_attr_node)) | |
7739 | post_error_ne ("Value_Size of & is too large", gnat_attr_node, | |
7740 | gnat_entity); | |
a1ab4c31 AC |
7741 | return; |
7742 | } | |
7743 | ||
728936bb EB |
7744 | /* Ignore a zero size unless a Value_Size clause exists, or a size clause |
7745 | exists, or this is an integer type, in which case the front-end will | |
7746 | have always set it. */ | |
7747 | if (No (gnat_attr_node) | |
7748 | && integer_zerop (size) | |
7749 | && !Has_Size_Clause (gnat_entity) | |
7750 | && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) | |
a1ab4c31 AC |
7751 | return; |
7752 | ||
8ff6c664 EB |
7753 | old_size = rm_size (gnu_type); |
7754 | ||
a1ab4c31 AC |
7755 | /* If the old size is self-referential, get the maximum size. */ |
7756 | if (CONTAINS_PLACEHOLDER_P (old_size)) | |
7757 | old_size = max_size (old_size, true); | |
7758 | ||
03049a4e EB |
7759 | /* If the size of the object is a constant, the new size must not be smaller |
7760 | (the front-end has verified this for scalar and packed array types). */ | |
a1ab4c31 AC |
7761 | if (TREE_CODE (old_size) != INTEGER_CST |
7762 | || TREE_OVERFLOW (old_size) | |
03049a4e EB |
7763 | || (AGGREGATE_TYPE_P (gnu_type) |
7764 | && !(TREE_CODE (gnu_type) == ARRAY_TYPE | |
7765 | && TYPE_PACKED_ARRAY_TYPE_P (gnu_type)) | |
315cff15 | 7766 | && !(TYPE_IS_PADDING_P (gnu_type) |
03049a4e | 7767 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE |
58c8f770 EB |
7768 | && TYPE_PACKED_ARRAY_TYPE_P |
7769 | (TREE_TYPE (TYPE_FIELDS (gnu_type)))) | |
03049a4e | 7770 | && tree_int_cst_lt (size, old_size))) |
a1ab4c31 AC |
7771 | { |
7772 | if (Present (gnat_attr_node)) | |
7773 | post_error_ne_tree | |
7774 | ("Value_Size for& too small{, minimum allowed is ^}", | |
7775 | gnat_attr_node, gnat_entity, old_size); | |
a1ab4c31 AC |
7776 | return; |
7777 | } | |
7778 | ||
e6e15ec9 | 7779 | /* Otherwise, set the RM size proper for integral types... */ |
b4680ca1 EB |
7780 | if ((TREE_CODE (gnu_type) == INTEGER_TYPE |
7781 | && Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) | |
7782 | || (TREE_CODE (gnu_type) == ENUMERAL_TYPE | |
7783 | || TREE_CODE (gnu_type) == BOOLEAN_TYPE)) | |
84fb43a1 | 7784 | SET_TYPE_RM_SIZE (gnu_type, size); |
b4680ca1 EB |
7785 | |
7786 | /* ...or the Ada size for record and union types. */ | |
a1ab4c31 AC |
7787 | else if ((TREE_CODE (gnu_type) == RECORD_TYPE |
7788 | || TREE_CODE (gnu_type) == UNION_TYPE | |
7789 | || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) | |
315cff15 | 7790 | && !TYPE_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
7791 | SET_TYPE_ADA_SIZE (gnu_type, size); |
7792 | } | |
7793 | \f | |
7794 | /* Given a type TYPE, return a new type whose size is appropriate for SIZE. | |
7795 | If TYPE is the best type, return it. Otherwise, make a new type. We | |
1e17ef87 | 7796 | only support new integral and pointer types. FOR_BIASED is true if |
a1ab4c31 AC |
7797 | we are making a biased type. */ |
7798 | ||
7799 | static tree | |
7800 | make_type_from_size (tree type, tree size_tree, bool for_biased) | |
7801 | { | |
7802 | unsigned HOST_WIDE_INT size; | |
e66e5d9e | 7803 | bool biased_p; |
a1ab4c31 AC |
7804 | tree new_type; |
7805 | ||
7806 | /* If size indicates an error, just return TYPE to avoid propagating | |
7807 | the error. Likewise if it's too large to represent. */ | |
7808 | if (!size_tree || !host_integerp (size_tree, 1)) | |
7809 | return type; | |
7810 | ||
7811 | size = tree_low_cst (size_tree, 1); | |
7812 | ||
7813 | switch (TREE_CODE (type)) | |
7814 | { | |
7815 | case INTEGER_TYPE: | |
7816 | case ENUMERAL_TYPE: | |
01ddebf2 | 7817 | case BOOLEAN_TYPE: |
a1ab4c31 AC |
7818 | biased_p = (TREE_CODE (type) == INTEGER_TYPE |
7819 | && TYPE_BIASED_REPRESENTATION_P (type)); | |
7820 | ||
ff67c0a5 EB |
7821 | /* Integer types with precision 0 are forbidden. */ |
7822 | if (size == 0) | |
7823 | size = 1; | |
7824 | ||
a1ab4c31 AC |
7825 | /* Only do something if the type is not a packed array type and |
7826 | doesn't already have the proper size. */ | |
7827 | if (TYPE_PACKED_ARRAY_TYPE_P (type) | |
e66e5d9e | 7828 | || (TYPE_PRECISION (type) == size && biased_p == for_biased)) |
a1ab4c31 AC |
7829 | break; |
7830 | ||
7831 | biased_p |= for_biased; | |
feec4372 EB |
7832 | if (size > LONG_LONG_TYPE_SIZE) |
7833 | size = LONG_LONG_TYPE_SIZE; | |
a1ab4c31 AC |
7834 | |
7835 | if (TYPE_UNSIGNED (type) || biased_p) | |
7836 | new_type = make_unsigned_type (size); | |
7837 | else | |
7838 | new_type = make_signed_type (size); | |
7839 | TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type; | |
84fb43a1 EB |
7840 | SET_TYPE_RM_MIN_VALUE (new_type, |
7841 | convert (TREE_TYPE (new_type), | |
7842 | TYPE_MIN_VALUE (type))); | |
7843 | SET_TYPE_RM_MAX_VALUE (new_type, | |
7844 | convert (TREE_TYPE (new_type), | |
7845 | TYPE_MAX_VALUE (type))); | |
169afcb9 EB |
7846 | /* Copy the name to show that it's essentially the same type and |
7847 | not a subrange type. */ | |
7848 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
a1ab4c31 | 7849 | TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p; |
84fb43a1 | 7850 | SET_TYPE_RM_SIZE (new_type, bitsize_int (size)); |
a1ab4c31 AC |
7851 | return new_type; |
7852 | ||
7853 | case RECORD_TYPE: | |
7854 | /* Do something if this is a fat pointer, in which case we | |
7855 | may need to return the thin pointer. */ | |
315cff15 | 7856 | if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2) |
6ca2b0a0 DR |
7857 | { |
7858 | enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0); | |
7859 | if (!targetm.valid_pointer_mode (p_mode)) | |
7860 | p_mode = ptr_mode; | |
7861 | return | |
7862 | build_pointer_type_for_mode | |
7863 | (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)), | |
7864 | p_mode, 0); | |
7865 | } | |
a1ab4c31 AC |
7866 | break; |
7867 | ||
7868 | case POINTER_TYPE: | |
7869 | /* Only do something if this is a thin pointer, in which case we | |
7870 | may need to return the fat pointer. */ | |
315cff15 | 7871 | if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2) |
a1ab4c31 AC |
7872 | return |
7873 | build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))); | |
7874 | break; | |
7875 | ||
7876 | default: | |
7877 | break; | |
7878 | } | |
7879 | ||
7880 | return type; | |
7881 | } | |
7882 | \f | |
7883 | /* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY, | |
7884 | a type or object whose present alignment is ALIGN. If this alignment is | |
7885 | valid, return it. Otherwise, give an error and return ALIGN. */ | |
7886 | ||
7887 | static unsigned int | |
7888 | validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align) | |
7889 | { | |
7890 | unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment (); | |
7891 | unsigned int new_align; | |
7892 | Node_Id gnat_error_node; | |
7893 | ||
7894 | /* Don't worry about checking alignment if alignment was not specified | |
7895 | by the source program and we already posted an error for this entity. */ | |
7896 | if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity)) | |
7897 | return align; | |
7898 | ||
ec88784d AC |
7899 | /* Post the error on the alignment clause if any. Note, for the implicit |
7900 | base type of an array type, the alignment clause is on the first | |
7901 | subtype. */ | |
a1ab4c31 AC |
7902 | if (Present (Alignment_Clause (gnat_entity))) |
7903 | gnat_error_node = Expression (Alignment_Clause (gnat_entity)); | |
ec88784d AC |
7904 | |
7905 | else if (Is_Itype (gnat_entity) | |
7906 | && Is_Array_Type (gnat_entity) | |
7907 | && Etype (gnat_entity) == gnat_entity | |
7908 | && Present (Alignment_Clause (First_Subtype (gnat_entity)))) | |
7909 | gnat_error_node = | |
7910 | Expression (Alignment_Clause (First_Subtype (gnat_entity))); | |
7911 | ||
a1ab4c31 AC |
7912 | else |
7913 | gnat_error_node = gnat_entity; | |
7914 | ||
7915 | /* Within GCC, an alignment is an integer, so we must make sure a value is | |
7916 | specified that fits in that range. Also, there is an upper bound to | |
7917 | alignments we can support/allow. */ | |
7918 | if (!UI_Is_In_Int_Range (alignment) | |
7919 | || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment)) | |
7920 | post_error_ne_num ("largest supported alignment for& is ^", | |
7921 | gnat_error_node, gnat_entity, max_allowed_alignment); | |
7922 | else if (!(Present (Alignment_Clause (gnat_entity)) | |
7923 | && From_At_Mod (Alignment_Clause (gnat_entity))) | |
7924 | && new_align * BITS_PER_UNIT < align) | |
caa9d12a EB |
7925 | { |
7926 | unsigned int double_align; | |
7927 | bool is_capped_double, align_clause; | |
7928 | ||
7929 | /* If the default alignment of "double" or larger scalar types is | |
7930 | specifically capped and the new alignment is above the cap, do | |
7931 | not post an error and change the alignment only if there is an | |
7932 | alignment clause; this makes it possible to have the associated | |
7933 | GCC type overaligned by default for performance reasons. */ | |
7934 | if ((double_align = double_float_alignment) > 0) | |
7935 | { | |
7936 | Entity_Id gnat_type | |
7937 | = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); | |
7938 | is_capped_double | |
7939 | = is_double_float_or_array (gnat_type, &align_clause); | |
7940 | } | |
7941 | else if ((double_align = double_scalar_alignment) > 0) | |
7942 | { | |
7943 | Entity_Id gnat_type | |
7944 | = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); | |
7945 | is_capped_double | |
7946 | = is_double_scalar_or_array (gnat_type, &align_clause); | |
7947 | } | |
7948 | else | |
7949 | is_capped_double = align_clause = false; | |
7950 | ||
7951 | if (is_capped_double && new_align >= double_align) | |
7952 | { | |
7953 | if (align_clause) | |
7954 | align = new_align * BITS_PER_UNIT; | |
7955 | } | |
7956 | else | |
7957 | { | |
7958 | if (is_capped_double) | |
7959 | align = double_align * BITS_PER_UNIT; | |
7960 | ||
7961 | post_error_ne_num ("alignment for& must be at least ^", | |
7962 | gnat_error_node, gnat_entity, | |
7963 | align / BITS_PER_UNIT); | |
7964 | } | |
7965 | } | |
a1ab4c31 AC |
7966 | else |
7967 | { | |
7968 | new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1); | |
7969 | if (new_align > align) | |
7970 | align = new_align; | |
7971 | } | |
7972 | ||
7973 | return align; | |
7974 | } | |
7975 | ||
7976 | /* Return the smallest alignment not less than SIZE. */ | |
7977 | ||
7978 | static unsigned int | |
7979 | ceil_alignment (unsigned HOST_WIDE_INT size) | |
7980 | { | |
7981 | return (unsigned int) 1 << (floor_log2 (size - 1) + 1); | |
7982 | } | |
7983 | \f | |
7984 | /* Verify that OBJECT, a type or decl, is something we can implement | |
7985 | atomically. If not, give an error for GNAT_ENTITY. COMP_P is true | |
7986 | if we require atomic components. */ | |
7987 | ||
7988 | static void | |
7989 | check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p) | |
7990 | { | |
7991 | Node_Id gnat_error_point = gnat_entity; | |
7992 | Node_Id gnat_node; | |
7993 | enum machine_mode mode; | |
7994 | unsigned int align; | |
7995 | tree size; | |
7996 | ||
7997 | /* There are three case of what OBJECT can be. It can be a type, in which | |
7998 | case we take the size, alignment and mode from the type. It can be a | |
7999 | declaration that was indirect, in which case the relevant values are | |
8000 | that of the type being pointed to, or it can be a normal declaration, | |
8001 | in which case the values are of the decl. The code below assumes that | |
8002 | OBJECT is either a type or a decl. */ | |
8003 | if (TYPE_P (object)) | |
8004 | { | |
5004b234 EB |
8005 | /* If this is an anonymous base type, nothing to check. Error will be |
8006 | reported on the source type. */ | |
8007 | if (!Comes_From_Source (gnat_entity)) | |
8008 | return; | |
8009 | ||
a1ab4c31 AC |
8010 | mode = TYPE_MODE (object); |
8011 | align = TYPE_ALIGN (object); | |
8012 | size = TYPE_SIZE (object); | |
8013 | } | |
8014 | else if (DECL_BY_REF_P (object)) | |
8015 | { | |
8016 | mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object))); | |
8017 | align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object))); | |
8018 | size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object))); | |
8019 | } | |
8020 | else | |
8021 | { | |
8022 | mode = DECL_MODE (object); | |
8023 | align = DECL_ALIGN (object); | |
8024 | size = DECL_SIZE (object); | |
8025 | } | |
8026 | ||
8027 | /* Consider all floating-point types atomic and any types that that are | |
8028 | represented by integers no wider than a machine word. */ | |
8029 | if (GET_MODE_CLASS (mode) == MODE_FLOAT | |
8030 | || ((GET_MODE_CLASS (mode) == MODE_INT | |
8031 | || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT) | |
8032 | && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD)) | |
8033 | return; | |
8034 | ||
8035 | /* For the moment, also allow anything that has an alignment equal | |
8036 | to its size and which is smaller than a word. */ | |
8037 | if (size && TREE_CODE (size) == INTEGER_CST | |
8038 | && compare_tree_int (size, align) == 0 | |
8039 | && align <= BITS_PER_WORD) | |
8040 | return; | |
8041 | ||
8042 | for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node); | |
8043 | gnat_node = Next_Rep_Item (gnat_node)) | |
8044 | { | |
8045 | if (!comp_p && Nkind (gnat_node) == N_Pragma | |
8046 | && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))) | |
8047 | == Pragma_Atomic)) | |
8048 | gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); | |
8049 | else if (comp_p && Nkind (gnat_node) == N_Pragma | |
8050 | && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))) | |
8051 | == Pragma_Atomic_Components)) | |
8052 | gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); | |
8053 | } | |
8054 | ||
8055 | if (comp_p) | |
8056 | post_error_ne ("atomic access to component of & cannot be guaranteed", | |
8057 | gnat_error_point, gnat_entity); | |
8058 | else | |
8059 | post_error_ne ("atomic access to & cannot be guaranteed", | |
8060 | gnat_error_point, gnat_entity); | |
8061 | } | |
8062 | \f | |
a1ab4c31 | 8063 | |
1515785d OH |
8064 | /* Helper for the intrin compatibility checks family. Evaluate whether |
8065 | two types are definitely incompatible. */ | |
a1ab4c31 | 8066 | |
1515785d OH |
8067 | static bool |
8068 | intrin_types_incompatible_p (tree t1, tree t2) | |
8069 | { | |
8070 | enum tree_code code; | |
8071 | ||
8072 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
8073 | return false; | |
8074 | ||
8075 | if (TYPE_MODE (t1) != TYPE_MODE (t2)) | |
8076 | return true; | |
8077 | ||
8078 | if (TREE_CODE (t1) != TREE_CODE (t2)) | |
8079 | return true; | |
8080 | ||
8081 | code = TREE_CODE (t1); | |
8082 | ||
8083 | switch (code) | |
8084 | { | |
8085 | case INTEGER_TYPE: | |
8086 | case REAL_TYPE: | |
8087 | return TYPE_PRECISION (t1) != TYPE_PRECISION (t2); | |
8088 | ||
8089 | case POINTER_TYPE: | |
8090 | case REFERENCE_TYPE: | |
8091 | /* Assume designated types are ok. We'd need to account for char * and | |
8092 | void * variants to do better, which could rapidly get messy and isn't | |
8093 | clearly worth the effort. */ | |
8094 | return false; | |
8095 | ||
8096 | default: | |
8097 | break; | |
8098 | } | |
8099 | ||
8100 | return false; | |
8101 | } | |
8102 | ||
8103 | /* Helper for intrin_profiles_compatible_p, to perform compatibility checks | |
8104 | on the Ada/builtin argument lists for the INB binding. */ | |
8105 | ||
8106 | static bool | |
8107 | intrin_arglists_compatible_p (intrin_binding_t * inb) | |
a1ab4c31 | 8108 | { |
1515785d OH |
8109 | tree ada_args = TYPE_ARG_TYPES (inb->ada_fntype); |
8110 | tree btin_args = TYPE_ARG_TYPES (inb->btin_fntype); | |
8111 | ||
8112 | /* Sequence position of the last argument we checked. */ | |
8113 | int argpos = 0; | |
8114 | ||
8115 | while (ada_args != 0 || btin_args != 0) | |
8116 | { | |
8117 | tree ada_type, btin_type; | |
8118 | ||
8119 | /* If one list is shorter than the other, they fail to match. */ | |
8120 | if (ada_args == 0 || btin_args == 0) | |
8121 | return false; | |
8122 | ||
8123 | ada_type = TREE_VALUE (ada_args); | |
8124 | btin_type = TREE_VALUE (btin_args); | |
8125 | ||
8126 | /* If we're done with the Ada args and not with the internal builtin | |
bb511fbd | 8127 | args, or the other way around, complain. */ |
1515785d OH |
8128 | if (ada_type == void_type_node |
8129 | && btin_type != void_type_node) | |
8130 | { | |
8131 | post_error ("?Ada arguments list too short!", inb->gnat_entity); | |
8132 | return false; | |
8133 | } | |
8134 | ||
1515785d OH |
8135 | if (btin_type == void_type_node |
8136 | && ada_type != void_type_node) | |
8137 | { | |
bb511fbd OH |
8138 | post_error_ne_num ("?Ada arguments list too long ('> ^)!", |
8139 | inb->gnat_entity, inb->gnat_entity, argpos); | |
8140 | return false; | |
1515785d OH |
8141 | } |
8142 | ||
8143 | /* Otherwise, check that types match for the current argument. */ | |
8144 | argpos ++; | |
8145 | if (intrin_types_incompatible_p (ada_type, btin_type)) | |
8146 | { | |
8147 | post_error_ne_num ("?intrinsic binding type mismatch on argument ^!", | |
8148 | inb->gnat_entity, inb->gnat_entity, argpos); | |
8149 | return false; | |
8150 | } | |
8151 | ||
8152 | ada_args = TREE_CHAIN (ada_args); | |
8153 | btin_args = TREE_CHAIN (btin_args); | |
8154 | } | |
8155 | ||
8156 | return true; | |
8157 | } | |
8158 | ||
8159 | /* Helper for intrin_profiles_compatible_p, to perform compatibility checks | |
8160 | on the Ada/builtin return values for the INB binding. */ | |
8161 | ||
8162 | static bool | |
8163 | intrin_return_compatible_p (intrin_binding_t * inb) | |
8164 | { | |
8165 | tree ada_return_type = TREE_TYPE (inb->ada_fntype); | |
8166 | tree btin_return_type = TREE_TYPE (inb->btin_fntype); | |
8167 | ||
bb511fbd | 8168 | /* Accept function imported as procedure, common and convenient. */ |
1515785d OH |
8169 | if (VOID_TYPE_P (ada_return_type) |
8170 | && !VOID_TYPE_P (btin_return_type)) | |
bb511fbd | 8171 | return true; |
1515785d | 8172 | |
bb511fbd OH |
8173 | /* Check return types compatibility otherwise. Note that this |
8174 | handles void/void as well. */ | |
1515785d OH |
8175 | if (intrin_types_incompatible_p (btin_return_type, ada_return_type)) |
8176 | { | |
8177 | post_error ("?intrinsic binding type mismatch on return value!", | |
8178 | inb->gnat_entity); | |
8179 | return false; | |
8180 | } | |
8181 | ||
8182 | return true; | |
8183 | } | |
8184 | ||
8185 | /* Check and return whether the Ada and gcc builtin profiles bound by INB are | |
8186 | compatible. Issue relevant warnings when they are not. | |
8187 | ||
8188 | This is intended as a light check to diagnose the most obvious cases, not | |
8189 | as a full fledged type compatiblity predicate. It is the programmer's | |
8190 | responsibility to ensure correctness of the Ada declarations in Imports, | |
8191 | especially when binding straight to a compiler internal. */ | |
8192 | ||
8193 | static bool | |
8194 | intrin_profiles_compatible_p (intrin_binding_t * inb) | |
8195 | { | |
8196 | /* Check compatibility on return values and argument lists, each responsible | |
8197 | for posting warnings as appropriate. Ensure use of the proper sloc for | |
8198 | this purpose. */ | |
8199 | ||
8200 | bool arglists_compatible_p, return_compatible_p; | |
8201 | location_t saved_location = input_location; | |
8202 | ||
8203 | Sloc_to_locus (Sloc (inb->gnat_entity), &input_location); | |
a1ab4c31 | 8204 | |
1515785d OH |
8205 | return_compatible_p = intrin_return_compatible_p (inb); |
8206 | arglists_compatible_p = intrin_arglists_compatible_p (inb); | |
a1ab4c31 | 8207 | |
1515785d | 8208 | input_location = saved_location; |
a1ab4c31 | 8209 | |
1515785d | 8210 | return return_compatible_p && arglists_compatible_p; |
a1ab4c31 AC |
8211 | } |
8212 | \f | |
95c1c4bb EB |
8213 | /* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type |
8214 | and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the | |
8215 | specified size for this field. POS_LIST is a position list describing | |
8216 | the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied | |
8217 | to this layout. */ | |
8218 | ||
8219 | static tree | |
8220 | create_field_decl_from (tree old_field, tree field_type, tree record_type, | |
8221 | tree size, tree pos_list, tree subst_list) | |
8222 | { | |
8223 | tree t = TREE_VALUE (purpose_member (old_field, pos_list)); | |
8224 | tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2); | |
8225 | unsigned int offset_align = tree_low_cst (TREE_VEC_ELT (t, 1), 1); | |
8226 | tree new_pos, new_field; | |
8227 | ||
8228 | if (CONTAINS_PLACEHOLDER_P (pos)) | |
8229 | for (t = subst_list; t; t = TREE_CHAIN (t)) | |
8230 | pos = SUBSTITUTE_IN_EXPR (pos, TREE_PURPOSE (t), TREE_VALUE (t)); | |
8231 | ||
8232 | /* If the position is now a constant, we can set it as the position of the | |
8233 | field when we make it. Otherwise, we need to deal with it specially. */ | |
8234 | if (TREE_CONSTANT (pos)) | |
8235 | new_pos = bit_from_pos (pos, bitpos); | |
8236 | else | |
8237 | new_pos = NULL_TREE; | |
8238 | ||
8239 | new_field | |
8240 | = create_field_decl (DECL_NAME (old_field), field_type, record_type, | |
da01bfee | 8241 | size, new_pos, DECL_PACKED (old_field), |
95c1c4bb EB |
8242 | !DECL_NONADDRESSABLE_P (old_field)); |
8243 | ||
8244 | if (!new_pos) | |
8245 | { | |
8246 | normalize_offset (&pos, &bitpos, offset_align); | |
8247 | DECL_FIELD_OFFSET (new_field) = pos; | |
8248 | DECL_FIELD_BIT_OFFSET (new_field) = bitpos; | |
8249 | SET_DECL_OFFSET_ALIGN (new_field, offset_align); | |
8250 | DECL_SIZE (new_field) = size; | |
8251 | DECL_SIZE_UNIT (new_field) | |
8252 | = convert (sizetype, | |
8253 | size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node)); | |
8254 | layout_decl (new_field, DECL_OFFSET_ALIGN (new_field)); | |
8255 | } | |
8256 | ||
8257 | DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); | |
cb3d597d | 8258 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field); |
95c1c4bb EB |
8259 | DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field); |
8260 | TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field); | |
8261 | ||
8262 | return new_field; | |
8263 | } | |
8264 | ||
8265 | /* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */ | |
8266 | ||
8267 | static tree | |
8268 | get_rep_part (tree record_type) | |
8269 | { | |
8270 | tree field = TYPE_FIELDS (record_type); | |
8271 | ||
8272 | /* The REP part is the first field, internal, another record, and its name | |
8273 | doesn't start with an underscore (i.e. is not generated by the FE). */ | |
8274 | if (DECL_INTERNAL_P (field) | |
8275 | && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE | |
8276 | && IDENTIFIER_POINTER (DECL_NAME (field)) [0] != '_') | |
8277 | return field; | |
8278 | ||
8279 | return NULL_TREE; | |
8280 | } | |
8281 | ||
8282 | /* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */ | |
8283 | ||
8284 | static tree | |
8285 | get_variant_part (tree record_type) | |
8286 | { | |
8287 | tree field; | |
8288 | ||
8289 | /* The variant part is the only internal field that is a qualified union. */ | |
910ad8de | 8290 | for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field)) |
95c1c4bb EB |
8291 | if (DECL_INTERNAL_P (field) |
8292 | && TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE) | |
8293 | return field; | |
8294 | ||
8295 | return NULL_TREE; | |
8296 | } | |
8297 | ||
8298 | /* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is | |
8299 | the list of variants to be used and RECORD_TYPE is the type of the parent. | |
8300 | POS_LIST is a position list describing the layout of fields present in | |
8301 | OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this | |
8302 | layout. */ | |
8303 | ||
8304 | static tree | |
8305 | create_variant_part_from (tree old_variant_part, tree variant_list, | |
8306 | tree record_type, tree pos_list, tree subst_list) | |
8307 | { | |
8308 | tree offset = DECL_FIELD_OFFSET (old_variant_part); | |
95c1c4bb EB |
8309 | tree old_union_type = TREE_TYPE (old_variant_part); |
8310 | tree new_union_type, new_variant_part, t; | |
8311 | tree union_field_list = NULL_TREE; | |
8312 | ||
8313 | /* First create the type of the variant part from that of the old one. */ | |
8314 | new_union_type = make_node (QUAL_UNION_TYPE); | |
8315 | TYPE_NAME (new_union_type) = DECL_NAME (TYPE_NAME (old_union_type)); | |
8316 | ||
8317 | /* If the position of the variant part is constant, subtract it from the | |
8318 | size of the type of the parent to get the new size. This manual CSE | |
8319 | reduces the code size when not optimizing. */ | |
da01bfee | 8320 | if (TREE_CODE (offset) == INTEGER_CST) |
95c1c4bb | 8321 | { |
da01bfee | 8322 | tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part); |
95c1c4bb EB |
8323 | tree first_bit = bit_from_pos (offset, bitpos); |
8324 | TYPE_SIZE (new_union_type) | |
8325 | = size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit); | |
8326 | TYPE_SIZE_UNIT (new_union_type) | |
8327 | = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type), | |
8328 | byte_from_pos (offset, bitpos)); | |
8329 | SET_TYPE_ADA_SIZE (new_union_type, | |
8330 | size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type), | |
8331 | first_bit)); | |
8332 | TYPE_ALIGN (new_union_type) = TYPE_ALIGN (old_union_type); | |
8333 | relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY); | |
8334 | } | |
8335 | else | |
8336 | copy_and_substitute_in_size (new_union_type, old_union_type, subst_list); | |
8337 | ||
8338 | /* Now finish up the new variants and populate the union type. */ | |
8339 | for (t = variant_list; t; t = TREE_CHAIN (t)) | |
8340 | { | |
8341 | tree old_field = TREE_VEC_ELT (TREE_VALUE (t), 0), new_field; | |
8342 | tree old_variant, old_variant_subpart, new_variant, field_list; | |
8343 | ||
8344 | /* Skip variants that don't belong to this nesting level. */ | |
8345 | if (DECL_CONTEXT (old_field) != old_union_type) | |
8346 | continue; | |
8347 | ||
8348 | /* Retrieve the list of fields already added to the new variant. */ | |
8349 | new_variant = TREE_VEC_ELT (TREE_VALUE (t), 2); | |
8350 | field_list = TYPE_FIELDS (new_variant); | |
8351 | ||
8352 | /* If the old variant had a variant subpart, we need to create a new | |
8353 | variant subpart and add it to the field list. */ | |
8354 | old_variant = TREE_PURPOSE (t); | |
8355 | old_variant_subpart = get_variant_part (old_variant); | |
8356 | if (old_variant_subpart) | |
8357 | { | |
8358 | tree new_variant_subpart | |
8359 | = create_variant_part_from (old_variant_subpart, variant_list, | |
8360 | new_variant, pos_list, subst_list); | |
910ad8de | 8361 | DECL_CHAIN (new_variant_subpart) = field_list; |
95c1c4bb EB |
8362 | field_list = new_variant_subpart; |
8363 | } | |
8364 | ||
032d1b71 EB |
8365 | /* Finish up the new variant and create the field. No need for debug |
8366 | info thanks to the XVS type. */ | |
8367 | finish_record_type (new_variant, nreverse (field_list), 2, false); | |
95c1c4bb | 8368 | compute_record_mode (new_variant); |
95c1c4bb EB |
8369 | create_type_decl (TYPE_NAME (new_variant), new_variant, NULL, |
8370 | true, false, Empty); | |
8371 | ||
8372 | new_field | |
8373 | = create_field_decl_from (old_field, new_variant, new_union_type, | |
8374 | TYPE_SIZE (new_variant), | |
8375 | pos_list, subst_list); | |
8376 | DECL_QUALIFIER (new_field) = TREE_VEC_ELT (TREE_VALUE (t), 1); | |
8377 | DECL_INTERNAL_P (new_field) = 1; | |
910ad8de | 8378 | DECL_CHAIN (new_field) = union_field_list; |
95c1c4bb EB |
8379 | union_field_list = new_field; |
8380 | } | |
8381 | ||
032d1b71 EB |
8382 | /* Finish up the union type and create the variant part. No need for debug |
8383 | info thanks to the XVS type. */ | |
8384 | finish_record_type (new_union_type, union_field_list, 2, false); | |
95c1c4bb | 8385 | compute_record_mode (new_union_type); |
95c1c4bb EB |
8386 | create_type_decl (TYPE_NAME (new_union_type), new_union_type, NULL, |
8387 | true, false, Empty); | |
8388 | ||
8389 | new_variant_part | |
8390 | = create_field_decl_from (old_variant_part, new_union_type, record_type, | |
8391 | TYPE_SIZE (new_union_type), | |
8392 | pos_list, subst_list); | |
8393 | DECL_INTERNAL_P (new_variant_part) = 1; | |
8394 | ||
8395 | /* With multiple discriminants it is possible for an inner variant to be | |
8396 | statically selected while outer ones are not; in this case, the list | |
8397 | of fields of the inner variant is not flattened and we end up with a | |
8398 | qualified union with a single member. Drop the useless container. */ | |
910ad8de | 8399 | if (!DECL_CHAIN (union_field_list)) |
95c1c4bb EB |
8400 | { |
8401 | DECL_CONTEXT (union_field_list) = record_type; | |
8402 | DECL_FIELD_OFFSET (union_field_list) | |
8403 | = DECL_FIELD_OFFSET (new_variant_part); | |
8404 | DECL_FIELD_BIT_OFFSET (union_field_list) | |
8405 | = DECL_FIELD_BIT_OFFSET (new_variant_part); | |
8406 | SET_DECL_OFFSET_ALIGN (union_field_list, | |
8407 | DECL_OFFSET_ALIGN (new_variant_part)); | |
8408 | new_variant_part = union_field_list; | |
8409 | } | |
8410 | ||
8411 | return new_variant_part; | |
8412 | } | |
8413 | ||
8414 | /* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE, | |
8415 | which are both RECORD_TYPE, after applying the substitutions described | |
8416 | in SUBST_LIST. */ | |
8417 | ||
8418 | static void | |
8419 | copy_and_substitute_in_size (tree new_type, tree old_type, tree subst_list) | |
8420 | { | |
8421 | tree t; | |
8422 | ||
8423 | TYPE_SIZE (new_type) = TYPE_SIZE (old_type); | |
8424 | TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type); | |
8425 | SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type)); | |
8426 | TYPE_ALIGN (new_type) = TYPE_ALIGN (old_type); | |
8427 | relate_alias_sets (new_type, old_type, ALIAS_SET_COPY); | |
8428 | ||
8429 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type))) | |
8430 | for (t = subst_list; t; t = TREE_CHAIN (t)) | |
8431 | TYPE_SIZE (new_type) | |
8432 | = SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type), | |
8433 | TREE_PURPOSE (t), | |
8434 | TREE_VALUE (t)); | |
8435 | ||
8436 | if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type))) | |
8437 | for (t = subst_list; t; t = TREE_CHAIN (t)) | |
8438 | TYPE_SIZE_UNIT (new_type) | |
8439 | = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type), | |
8440 | TREE_PURPOSE (t), | |
8441 | TREE_VALUE (t)); | |
8442 | ||
8443 | if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type))) | |
8444 | for (t = subst_list; t; t = TREE_CHAIN (t)) | |
8445 | SET_TYPE_ADA_SIZE | |
8446 | (new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type), | |
8447 | TREE_PURPOSE (t), | |
8448 | TREE_VALUE (t))); | |
8449 | ||
8450 | /* Finalize the size. */ | |
8451 | TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type)); | |
8452 | TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type)); | |
8453 | } | |
8454 | \f | |
77022fa8 EB |
8455 | /* Given a type T, a FIELD_DECL F, and a replacement value R, return a |
8456 | type with all size expressions that contain F in a PLACEHOLDER_EXPR | |
8457 | updated by replacing F with R. | |
8458 | ||
8459 | The function doesn't update the layout of the type, i.e. it assumes | |
8460 | that the substitution is purely formal. That's why the replacement | |
8461 | value R must itself contain a PLACEHOLDER_EXPR. */ | |
a1ab4c31 AC |
8462 | |
8463 | tree | |
8464 | substitute_in_type (tree t, tree f, tree r) | |
8465 | { | |
c6bd4220 | 8466 | tree nt; |
77022fa8 EB |
8467 | |
8468 | gcc_assert (CONTAINS_PLACEHOLDER_P (r)); | |
a1ab4c31 AC |
8469 | |
8470 | switch (TREE_CODE (t)) | |
8471 | { | |
8472 | case INTEGER_TYPE: | |
8473 | case ENUMERAL_TYPE: | |
8474 | case BOOLEAN_TYPE: | |
a531043b | 8475 | case REAL_TYPE: |
84fb43a1 EB |
8476 | |
8477 | /* First the domain types of arrays. */ | |
8478 | if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t)) | |
8479 | || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t))) | |
a1ab4c31 | 8480 | { |
84fb43a1 EB |
8481 | tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r); |
8482 | tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r); | |
a1ab4c31 | 8483 | |
84fb43a1 | 8484 | if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t)) |
a1ab4c31 AC |
8485 | return t; |
8486 | ||
c6bd4220 EB |
8487 | nt = copy_type (t); |
8488 | TYPE_GCC_MIN_VALUE (nt) = low; | |
8489 | TYPE_GCC_MAX_VALUE (nt) = high; | |
a531043b EB |
8490 | |
8491 | if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t)) | |
a1ab4c31 | 8492 | SET_TYPE_INDEX_TYPE |
c6bd4220 | 8493 | (nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r)); |
a1ab4c31 | 8494 | |
c6bd4220 | 8495 | return nt; |
a1ab4c31 | 8496 | } |
77022fa8 | 8497 | |
84fb43a1 EB |
8498 | /* Then the subtypes. */ |
8499 | if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t)) | |
8500 | || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t))) | |
8501 | { | |
8502 | tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r); | |
8503 | tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r); | |
8504 | ||
8505 | if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t)) | |
8506 | return t; | |
8507 | ||
c6bd4220 EB |
8508 | nt = copy_type (t); |
8509 | SET_TYPE_RM_MIN_VALUE (nt, low); | |
8510 | SET_TYPE_RM_MAX_VALUE (nt, high); | |
84fb43a1 | 8511 | |
c6bd4220 | 8512 | return nt; |
84fb43a1 EB |
8513 | } |
8514 | ||
a1ab4c31 AC |
8515 | return t; |
8516 | ||
8517 | case COMPLEX_TYPE: | |
c6bd4220 EB |
8518 | nt = substitute_in_type (TREE_TYPE (t), f, r); |
8519 | if (nt == TREE_TYPE (t)) | |
a1ab4c31 AC |
8520 | return t; |
8521 | ||
c6bd4220 | 8522 | return build_complex_type (nt); |
a1ab4c31 AC |
8523 | |
8524 | case OFFSET_TYPE: | |
8525 | case METHOD_TYPE: | |
8526 | case FUNCTION_TYPE: | |
8527 | case LANG_TYPE: | |
77022fa8 | 8528 | /* These should never show up here. */ |
a1ab4c31 AC |
8529 | gcc_unreachable (); |
8530 | ||
8531 | case ARRAY_TYPE: | |
8532 | { | |
8533 | tree component = substitute_in_type (TREE_TYPE (t), f, r); | |
8534 | tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r); | |
8535 | ||
8536 | if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) | |
8537 | return t; | |
8538 | ||
c6bd4220 EB |
8539 | nt = build_array_type (component, domain); |
8540 | TYPE_ALIGN (nt) = TYPE_ALIGN (t); | |
8541 | TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t); | |
8542 | SET_TYPE_MODE (nt, TYPE_MODE (t)); | |
8543 | TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); | |
8544 | TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); | |
8545 | TYPE_NONALIASED_COMPONENT (nt) = TYPE_NONALIASED_COMPONENT (t); | |
8546 | TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t); | |
8547 | TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t); | |
8548 | return nt; | |
a1ab4c31 AC |
8549 | } |
8550 | ||
8551 | case RECORD_TYPE: | |
8552 | case UNION_TYPE: | |
8553 | case QUAL_UNION_TYPE: | |
8554 | { | |
77022fa8 | 8555 | bool changed_field = false; |
a1ab4c31 | 8556 | tree field; |
a1ab4c31 AC |
8557 | |
8558 | /* Start out with no fields, make new fields, and chain them | |
8559 | in. If we haven't actually changed the type of any field, | |
8560 | discard everything we've done and return the old type. */ | |
c6bd4220 EB |
8561 | nt = copy_type (t); |
8562 | TYPE_FIELDS (nt) = NULL_TREE; | |
a1ab4c31 | 8563 | |
910ad8de | 8564 | for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field)) |
a1ab4c31 | 8565 | { |
77022fa8 EB |
8566 | tree new_field = copy_node (field), new_n; |
8567 | ||
8568 | new_n = substitute_in_type (TREE_TYPE (field), f, r); | |
8569 | if (new_n != TREE_TYPE (field)) | |
a1ab4c31 | 8570 | { |
77022fa8 EB |
8571 | TREE_TYPE (new_field) = new_n; |
8572 | changed_field = true; | |
8573 | } | |
a1ab4c31 | 8574 | |
77022fa8 EB |
8575 | new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r); |
8576 | if (new_n != DECL_FIELD_OFFSET (field)) | |
8577 | { | |
8578 | DECL_FIELD_OFFSET (new_field) = new_n; | |
8579 | changed_field = true; | |
8580 | } | |
a1ab4c31 | 8581 | |
77022fa8 EB |
8582 | /* Do the substitution inside the qualifier, if any. */ |
8583 | if (TREE_CODE (t) == QUAL_UNION_TYPE) | |
8584 | { | |
8585 | new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r); | |
8586 | if (new_n != DECL_QUALIFIER (field)) | |
8587 | { | |
8588 | DECL_QUALIFIER (new_field) = new_n; | |
8589 | changed_field = true; | |
a1ab4c31 AC |
8590 | } |
8591 | } | |
8592 | ||
c6bd4220 | 8593 | DECL_CONTEXT (new_field) = nt; |
cb3d597d | 8594 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field); |
a1ab4c31 | 8595 | |
910ad8de | 8596 | DECL_CHAIN (new_field) = TYPE_FIELDS (nt); |
c6bd4220 | 8597 | TYPE_FIELDS (nt) = new_field; |
a1ab4c31 AC |
8598 | } |
8599 | ||
77022fa8 | 8600 | if (!changed_field) |
a1ab4c31 AC |
8601 | return t; |
8602 | ||
c6bd4220 EB |
8603 | TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt)); |
8604 | TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); | |
8605 | TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); | |
8606 | SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r)); | |
8607 | return nt; | |
a1ab4c31 AC |
8608 | } |
8609 | ||
8610 | default: | |
8611 | return t; | |
8612 | } | |
8613 | } | |
8614 | \f | |
b4680ca1 | 8615 | /* Return the RM size of GNU_TYPE. This is the actual number of bits |
a1ab4c31 AC |
8616 | needed to represent the object. */ |
8617 | ||
8618 | tree | |
8619 | rm_size (tree gnu_type) | |
8620 | { | |
e6e15ec9 | 8621 | /* For integral types, we store the RM size explicitly. */ |
a1ab4c31 AC |
8622 | if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type)) |
8623 | return TYPE_RM_SIZE (gnu_type); | |
b4680ca1 EB |
8624 | |
8625 | /* Return the RM size of the actual data plus the size of the template. */ | |
8626 | if (TREE_CODE (gnu_type) == RECORD_TYPE | |
8627 | && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) | |
a1ab4c31 AC |
8628 | return |
8629 | size_binop (PLUS_EXPR, | |
910ad8de | 8630 | rm_size (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))), |
a1ab4c31 | 8631 | DECL_SIZE (TYPE_FIELDS (gnu_type))); |
b4680ca1 EB |
8632 | |
8633 | /* For record types, we store the size explicitly. */ | |
8634 | if ((TREE_CODE (gnu_type) == RECORD_TYPE | |
8635 | || TREE_CODE (gnu_type) == UNION_TYPE | |
8636 | || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) | |
315cff15 | 8637 | && !TYPE_FAT_POINTER_P (gnu_type) |
b4680ca1 | 8638 | && TYPE_ADA_SIZE (gnu_type)) |
a1ab4c31 | 8639 | return TYPE_ADA_SIZE (gnu_type); |
b4680ca1 EB |
8640 | |
8641 | /* For other types, this is just the size. */ | |
8642 | return TYPE_SIZE (gnu_type); | |
a1ab4c31 AC |
8643 | } |
8644 | \f | |
0fb2335d EB |
8645 | /* Return the name to be used for GNAT_ENTITY. If a type, create a |
8646 | fully-qualified name, possibly with type information encoding. | |
8647 | Otherwise, return the name. */ | |
8648 | ||
8649 | tree | |
8650 | get_entity_name (Entity_Id gnat_entity) | |
8651 | { | |
8652 | Get_Encoded_Name (gnat_entity); | |
8653 | return get_identifier_with_length (Name_Buffer, Name_Len); | |
8654 | } | |
8655 | ||
a1ab4c31 AC |
8656 | /* Return an identifier representing the external name to be used for |
8657 | GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___" | |
8658 | and the specified suffix. */ | |
8659 | ||
8660 | tree | |
8661 | create_concat_name (Entity_Id gnat_entity, const char *suffix) | |
8662 | { | |
8663 | Entity_Kind kind = Ekind (gnat_entity); | |
8664 | ||
0fb2335d EB |
8665 | if (suffix) |
8666 | { | |
8667 | String_Template temp = {1, strlen (suffix)}; | |
8668 | Fat_Pointer fp = {suffix, &temp}; | |
8669 | Get_External_Name_With_Suffix (gnat_entity, fp); | |
8670 | } | |
8671 | else | |
8672 | Get_External_Name (gnat_entity, 0); | |
a1ab4c31 | 8673 | |
0fb2335d EB |
8674 | /* A variable using the Stdcall convention lives in a DLL. We adjust |
8675 | its name to use the jump table, the _imp__NAME contains the address | |
8676 | for the NAME variable. */ | |
a1ab4c31 AC |
8677 | if ((kind == E_Variable || kind == E_Constant) |
8678 | && Has_Stdcall_Convention (gnat_entity)) | |
8679 | { | |
0fb2335d EB |
8680 | const int len = 6 + Name_Len; |
8681 | char *new_name = (char *) alloca (len + 1); | |
8682 | strcpy (new_name, "_imp__"); | |
8683 | strcat (new_name, Name_Buffer); | |
8684 | return get_identifier_with_length (new_name, len); | |
a1ab4c31 AC |
8685 | } |
8686 | ||
0fb2335d | 8687 | return get_identifier_with_length (Name_Buffer, Name_Len); |
a1ab4c31 AC |
8688 | } |
8689 | ||
0fb2335d | 8690 | /* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a |
a1ab4c31 | 8691 | string, return a new IDENTIFIER_NODE that is the concatenation of |
0fb2335d | 8692 | the name followed by "___" and the specified suffix. */ |
a1ab4c31 AC |
8693 | |
8694 | tree | |
0fb2335d | 8695 | concat_name (tree gnu_name, const char *suffix) |
a1ab4c31 | 8696 | { |
0fb2335d EB |
8697 | const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix); |
8698 | char *new_name = (char *) alloca (len + 1); | |
8699 | strcpy (new_name, IDENTIFIER_POINTER (gnu_name)); | |
8700 | strcat (new_name, "___"); | |
8701 | strcat (new_name, suffix); | |
8702 | return get_identifier_with_length (new_name, len); | |
a1ab4c31 AC |
8703 | } |
8704 | ||
8705 | #include "gt-ada-decl.h" |