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a1ab4c31 AC |
1 | /**************************************************************************** |
2 | * * | |
3 | * GNAT COMPILER COMPONENTS * | |
4 | * * | |
5 | * U T I L S * | |
6 | * * | |
7 | * C Implementation File * | |
8 | * * | |
396a2ee2 | 9 | * Copyright (C) 1992-2016, 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 | ||
a1ab4c31 AC |
26 | #include "config.h" |
27 | #include "system.h" | |
28 | #include "coretypes.h" | |
2adfab87 AM |
29 | #include "target.h" |
30 | #include "function.h" | |
a1ab4c31 | 31 | #include "tree.h" |
d8a2d370 | 32 | #include "stringpool.h" |
2adfab87 AM |
33 | #include "cgraph.h" |
34 | #include "diagnostic.h" | |
35 | #include "alias.h" | |
36 | #include "fold-const.h" | |
d8a2d370 DN |
37 | #include "stor-layout.h" |
38 | #include "attribs.h" | |
39 | #include "varasm.h" | |
a1ab4c31 AC |
40 | #include "toplev.h" |
41 | #include "output.h" | |
a1ab4c31 AC |
42 | #include "debug.h" |
43 | #include "convert.h" | |
677f3fa8 | 44 | #include "common/common-target.h" |
8713b7e4 | 45 | #include "langhooks.h" |
8713b7e4 | 46 | #include "tree-dump.h" |
a1ab4c31 | 47 | #include "tree-inline.h" |
a1ab4c31 AC |
48 | |
49 | #include "ada.h" | |
50 | #include "types.h" | |
51 | #include "atree.h" | |
a1ab4c31 | 52 | #include "nlists.h" |
a1ab4c31 AC |
53 | #include "uintp.h" |
54 | #include "fe.h" | |
55 | #include "sinfo.h" | |
56 | #include "einfo.h" | |
57 | #include "ada-tree.h" | |
58 | #include "gigi.h" | |
59 | ||
a1ab4c31 AC |
60 | /* If nonzero, pretend we are allocating at global level. */ |
61 | int force_global; | |
62 | ||
caa9d12a EB |
63 | /* The default alignment of "double" floating-point types, i.e. floating |
64 | point types whose size is equal to 64 bits, or 0 if this alignment is | |
65 | not specifically capped. */ | |
66 | int double_float_alignment; | |
67 | ||
68 | /* The default alignment of "double" or larger scalar types, i.e. scalar | |
69 | types whose size is greater or equal to 64 bits, or 0 if this alignment | |
70 | is not specifically capped. */ | |
71 | int double_scalar_alignment; | |
72 | ||
24228312 AC |
73 | /* True if floating-point arithmetics may use wider intermediate results. */ |
74 | bool fp_arith_may_widen = true; | |
75 | ||
a1ab4c31 AC |
76 | /* Tree nodes for the various types and decls we create. */ |
77 | tree gnat_std_decls[(int) ADT_LAST]; | |
78 | ||
79 | /* Functions to call for each of the possible raise reasons. */ | |
80 | tree gnat_raise_decls[(int) LAST_REASON_CODE + 1]; | |
81 | ||
ca8e13e8 | 82 | /* Likewise, but with extra info for each of the possible raise reasons. */ |
437f8c1e AC |
83 | tree gnat_raise_decls_ext[(int) LAST_REASON_CODE + 1]; |
84 | ||
a1ab4c31 AC |
85 | /* Forward declarations for handlers of attributes. */ |
86 | static tree handle_const_attribute (tree *, tree, tree, int, bool *); | |
87 | static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); | |
88 | static tree handle_pure_attribute (tree *, tree, tree, int, bool *); | |
89 | static tree handle_novops_attribute (tree *, tree, tree, int, bool *); | |
90 | static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); | |
91 | static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *); | |
92 | static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); | |
1f0b1322 EB |
93 | static tree handle_noinline_attribute (tree *, tree, tree, int, bool *); |
94 | static tree handle_noclone_attribute (tree *, tree, tree, int, bool *); | |
0d6e14fd | 95 | static tree handle_leaf_attribute (tree *, tree, tree, int, bool *); |
f087ea44 | 96 | static tree handle_always_inline_attribute (tree *, tree, tree, int, bool *); |
a1ab4c31 AC |
97 | static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); |
98 | static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *); | |
2724e58f | 99 | static tree handle_vector_size_attribute (tree *, tree, tree, int, bool *); |
7948ae37 | 100 | static tree handle_vector_type_attribute (tree *, tree, tree, int, bool *); |
a1ab4c31 AC |
101 | |
102 | /* Fake handler for attributes we don't properly support, typically because | |
103 | they'd require dragging a lot of the common-c front-end circuitry. */ | |
104 | static tree fake_attribute_handler (tree *, tree, tree, int, bool *); | |
105 | ||
106 | /* Table of machine-independent internal attributes for Ada. We support | |
107 | this minimal set of attributes to accommodate the needs of builtins. */ | |
108 | const struct attribute_spec gnat_internal_attribute_table[] = | |
109 | { | |
62d784f7 KT |
110 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler, |
111 | affects_type_identity } */ | |
112 | { "const", 0, 0, true, false, false, handle_const_attribute, | |
113 | false }, | |
114 | { "nothrow", 0, 0, true, false, false, handle_nothrow_attribute, | |
115 | false }, | |
116 | { "pure", 0, 0, true, false, false, handle_pure_attribute, | |
117 | false }, | |
118 | { "no vops", 0, 0, true, false, false, handle_novops_attribute, | |
119 | false }, | |
120 | { "nonnull", 0, -1, false, true, true, handle_nonnull_attribute, | |
121 | false }, | |
122 | { "sentinel", 0, 1, false, true, true, handle_sentinel_attribute, | |
123 | false }, | |
124 | { "noreturn", 0, 0, true, false, false, handle_noreturn_attribute, | |
125 | false }, | |
1f0b1322 EB |
126 | { "noinline", 0, 0, true, false, false, handle_noinline_attribute, |
127 | false }, | |
128 | { "noclone", 0, 0, true, false, false, handle_noclone_attribute, | |
129 | false }, | |
62d784f7 KT |
130 | { "leaf", 0, 0, true, false, false, handle_leaf_attribute, |
131 | false }, | |
f087ea44 AC |
132 | { "always_inline",0, 0, true, false, false, handle_always_inline_attribute, |
133 | false }, | |
62d784f7 KT |
134 | { "malloc", 0, 0, true, false, false, handle_malloc_attribute, |
135 | false }, | |
136 | { "type generic", 0, 0, false, true, true, handle_type_generic_attribute, | |
137 | false }, | |
138 | ||
139 | { "vector_size", 1, 1, false, true, false, handle_vector_size_attribute, | |
140 | false }, | |
141 | { "vector_type", 0, 0, false, true, false, handle_vector_type_attribute, | |
142 | false }, | |
143 | { "may_alias", 0, 0, false, true, false, NULL, false }, | |
a1ab4c31 AC |
144 | |
145 | /* ??? format and format_arg are heavy and not supported, which actually | |
146 | prevents support for stdio builtins, which we however declare as part | |
147 | of the common builtins.def contents. */ | |
62d784f7 KT |
148 | { "format", 3, 3, false, true, true, fake_attribute_handler, false }, |
149 | { "format_arg", 1, 1, false, true, true, fake_attribute_handler, false }, | |
a1ab4c31 | 150 | |
62d784f7 | 151 | { NULL, 0, 0, false, false, false, NULL, false } |
a1ab4c31 AC |
152 | }; |
153 | ||
154 | /* Associates a GNAT tree node to a GCC tree node. It is used in | |
155 | `save_gnu_tree', `get_gnu_tree' and `present_gnu_tree'. See documentation | |
156 | of `save_gnu_tree' for more info. */ | |
157 | static GTY((length ("max_gnat_nodes"))) tree *associate_gnat_to_gnu; | |
158 | ||
159 | #define GET_GNU_TREE(GNAT_ENTITY) \ | |
160 | associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] | |
161 | ||
162 | #define SET_GNU_TREE(GNAT_ENTITY,VAL) \ | |
163 | associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] = (VAL) | |
164 | ||
165 | #define PRESENT_GNU_TREE(GNAT_ENTITY) \ | |
166 | (associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE) | |
167 | ||
168 | /* Associates a GNAT entity to a GCC tree node used as a dummy, if any. */ | |
169 | static GTY((length ("max_gnat_nodes"))) tree *dummy_node_table; | |
170 | ||
171 | #define GET_DUMMY_NODE(GNAT_ENTITY) \ | |
172 | dummy_node_table[(GNAT_ENTITY) - First_Node_Id] | |
173 | ||
174 | #define SET_DUMMY_NODE(GNAT_ENTITY,VAL) \ | |
175 | dummy_node_table[(GNAT_ENTITY) - First_Node_Id] = (VAL) | |
176 | ||
177 | #define PRESENT_DUMMY_NODE(GNAT_ENTITY) \ | |
178 | (dummy_node_table[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE) | |
179 | ||
180 | /* This variable keeps a table for types for each precision so that we only | |
181 | allocate each of them once. Signed and unsigned types are kept separate. | |
182 | ||
183 | Note that these types are only used when fold-const requests something | |
184 | special. Perhaps we should NOT share these types; we'll see how it | |
185 | goes later. */ | |
186 | static GTY(()) tree signed_and_unsigned_types[2 * MAX_BITS_PER_WORD + 1][2]; | |
187 | ||
188 | /* Likewise for float types, but record these by mode. */ | |
189 | static GTY(()) tree float_types[NUM_MACHINE_MODES]; | |
190 | ||
191 | /* For each binding contour we allocate a binding_level structure to indicate | |
192 | the binding depth. */ | |
193 | ||
d1b38208 | 194 | struct GTY((chain_next ("%h.chain"))) gnat_binding_level { |
a1ab4c31 AC |
195 | /* The binding level containing this one (the enclosing binding level). */ |
196 | struct gnat_binding_level *chain; | |
197 | /* The BLOCK node for this level. */ | |
198 | tree block; | |
199 | /* If nonzero, the setjmp buffer that needs to be updated for any | |
200 | variable-sized definition within this context. */ | |
201 | tree jmpbuf_decl; | |
202 | }; | |
203 | ||
204 | /* The binding level currently in effect. */ | |
205 | static GTY(()) struct gnat_binding_level *current_binding_level; | |
206 | ||
207 | /* A chain of gnat_binding_level structures awaiting reuse. */ | |
208 | static GTY((deletable)) struct gnat_binding_level *free_binding_level; | |
209 | ||
228ee426 EB |
210 | /* The context to be used for global declarations. */ |
211 | static GTY(()) tree global_context; | |
212 | ||
a22b794d EB |
213 | /* An array of global declarations. */ |
214 | static GTY(()) vec<tree, va_gc> *global_decls; | |
a1ab4c31 AC |
215 | |
216 | /* An array of builtin function declarations. */ | |
9771b263 | 217 | static GTY(()) vec<tree, va_gc> *builtin_decls; |
a1ab4c31 | 218 | |
a1ab4c31 AC |
219 | /* A chain of unused BLOCK nodes. */ |
220 | static GTY((deletable)) tree free_block_chain; | |
221 | ||
842d4ee2 EB |
222 | /* A hash table of padded types. It is modelled on the generic type |
223 | hash table in tree.c, which must thus be used as a reference. */ | |
d242408f TS |
224 | |
225 | struct GTY((for_user)) pad_type_hash { | |
842d4ee2 EB |
226 | unsigned long hash; |
227 | tree type; | |
228 | }; | |
229 | ||
6c907cff | 230 | struct pad_type_hasher : ggc_cache_ptr_hash<pad_type_hash> |
d242408f TS |
231 | { |
232 | static inline hashval_t hash (pad_type_hash *t) { return t->hash; } | |
233 | static bool equal (pad_type_hash *a, pad_type_hash *b); | |
08ec2754 | 234 | static int keep_cache_entry (pad_type_hash *&); |
d242408f TS |
235 | }; |
236 | ||
237 | static GTY ((cache)) | |
238 | hash_table<pad_type_hasher> *pad_type_hash_table; | |
842d4ee2 | 239 | |
a1ab4c31 AC |
240 | static tree merge_sizes (tree, tree, tree, bool, bool); |
241 | static tree compute_related_constant (tree, tree); | |
242 | static tree split_plus (tree, tree *); | |
ef4bddc2 | 243 | static tree float_type_for_precision (int, machine_mode); |
a1ab4c31 | 244 | static tree convert_to_fat_pointer (tree, tree); |
5c475ba9 | 245 | static unsigned int scale_by_factor_of (tree, unsigned int); |
a1ab4c31 | 246 | static bool potential_alignment_gap (tree, tree, tree); |
9a30c7c4 | 247 | |
afc737f0 EB |
248 | /* Linked list used as a queue to defer the initialization of the DECL_CONTEXT |
249 | of ..._DECL nodes and of the TYPE_CONTEXT of ..._TYPE nodes. */ | |
9a30c7c4 AC |
250 | struct deferred_decl_context_node |
251 | { | |
afc737f0 EB |
252 | /* The ..._DECL node to work on. */ |
253 | tree decl; | |
254 | ||
255 | /* The corresponding entity's Scope. */ | |
256 | Entity_Id gnat_scope; | |
257 | ||
258 | /* The value of force_global when DECL was pushed. */ | |
259 | int force_global; | |
260 | ||
261 | /* The list of ..._TYPE nodes to propagate the context to. */ | |
262 | vec<tree> types; | |
263 | ||
264 | /* The next queue item. */ | |
265 | struct deferred_decl_context_node *next; | |
9a30c7c4 AC |
266 | }; |
267 | ||
268 | static struct deferred_decl_context_node *deferred_decl_context_queue = NULL; | |
269 | ||
270 | /* Defer the initialization of DECL's DECL_CONTEXT attribute, scheduling to | |
271 | feed it with the elaboration of GNAT_SCOPE. */ | |
272 | static struct deferred_decl_context_node * | |
273 | add_deferred_decl_context (tree decl, Entity_Id gnat_scope, int force_global); | |
274 | ||
275 | /* Defer the initialization of TYPE's TYPE_CONTEXT attribute, scheduling to | |
276 | feed it with the DECL_CONTEXT computed as part of N as soon as it is | |
277 | computed. */ | |
278 | static void add_deferred_type_context (struct deferred_decl_context_node *n, | |
279 | tree type); | |
a1ab4c31 | 280 | \f |
842d4ee2 | 281 | /* Initialize data structures of the utils.c module. */ |
a1ab4c31 AC |
282 | |
283 | void | |
842d4ee2 | 284 | init_gnat_utils (void) |
a1ab4c31 | 285 | { |
842d4ee2 | 286 | /* Initialize the association of GNAT nodes to GCC trees. */ |
766090c2 | 287 | associate_gnat_to_gnu = ggc_cleared_vec_alloc<tree> (max_gnat_nodes); |
842d4ee2 EB |
288 | |
289 | /* Initialize the association of GNAT nodes to GCC trees as dummies. */ | |
766090c2 | 290 | dummy_node_table = ggc_cleared_vec_alloc<tree> (max_gnat_nodes); |
842d4ee2 EB |
291 | |
292 | /* Initialize the hash table of padded types. */ | |
d242408f | 293 | pad_type_hash_table = hash_table<pad_type_hasher>::create_ggc (512); |
a1ab4c31 AC |
294 | } |
295 | ||
842d4ee2 | 296 | /* Destroy data structures of the utils.c module. */ |
f04b8d69 EB |
297 | |
298 | void | |
842d4ee2 | 299 | destroy_gnat_utils (void) |
f04b8d69 | 300 | { |
842d4ee2 | 301 | /* Destroy the association of GNAT nodes to GCC trees. */ |
f04b8d69 EB |
302 | ggc_free (associate_gnat_to_gnu); |
303 | associate_gnat_to_gnu = NULL; | |
f04b8d69 | 304 | |
842d4ee2 EB |
305 | /* Destroy the association of GNAT nodes to GCC trees as dummies. */ |
306 | ggc_free (dummy_node_table); | |
307 | dummy_node_table = NULL; | |
308 | ||
309 | /* Destroy the hash table of padded types. */ | |
d242408f | 310 | pad_type_hash_table->empty (); |
842d4ee2 | 311 | pad_type_hash_table = NULL; |
842d4ee2 EB |
312 | } |
313 | \f | |
a1d8cc63 EB |
314 | /* GNAT_ENTITY is a GNAT tree node for an entity. Associate GNU_DECL, a GCC |
315 | tree node, with GNAT_ENTITY. If GNU_DECL is not a ..._DECL node, abort. | |
316 | If NO_CHECK is true, the latter check is suppressed. | |
a1ab4c31 | 317 | |
a1d8cc63 | 318 | If GNU_DECL is zero, reset a previous association. */ |
a1ab4c31 AC |
319 | |
320 | void | |
321 | save_gnu_tree (Entity_Id gnat_entity, tree gnu_decl, bool no_check) | |
322 | { | |
323 | /* Check that GNAT_ENTITY is not already defined and that it is being set | |
a1d8cc63 | 324 | to something which is a decl. If that is not the case, this usually |
a1ab4c31 AC |
325 | means GNAT_ENTITY is defined twice, but occasionally is due to some |
326 | Gigi problem. */ | |
327 | gcc_assert (!(gnu_decl | |
328 | && (PRESENT_GNU_TREE (gnat_entity) | |
329 | || (!no_check && !DECL_P (gnu_decl))))); | |
330 | ||
331 | SET_GNU_TREE (gnat_entity, gnu_decl); | |
332 | } | |
333 | ||
a1d8cc63 EB |
334 | /* GNAT_ENTITY is a GNAT tree node for an entity. Return the GCC tree node |
335 | that was associated with it. If there is no such tree node, abort. | |
a1ab4c31 AC |
336 | |
337 | In some cases, such as delayed elaboration or expressions that need to | |
338 | be elaborated only once, GNAT_ENTITY is really not an entity. */ | |
339 | ||
340 | tree | |
341 | get_gnu_tree (Entity_Id gnat_entity) | |
342 | { | |
343 | gcc_assert (PRESENT_GNU_TREE (gnat_entity)); | |
344 | return GET_GNU_TREE (gnat_entity); | |
345 | } | |
346 | ||
347 | /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */ | |
348 | ||
349 | bool | |
350 | present_gnu_tree (Entity_Id gnat_entity) | |
351 | { | |
352 | return PRESENT_GNU_TREE (gnat_entity); | |
353 | } | |
354 | \f | |
a1ab4c31 AC |
355 | /* Make a dummy type corresponding to GNAT_TYPE. */ |
356 | ||
357 | tree | |
358 | make_dummy_type (Entity_Id gnat_type) | |
359 | { | |
bf0b0e5e | 360 | Entity_Id gnat_equiv = Gigi_Equivalent_Type (Underlying_Type (gnat_type)); |
a1ab4c31 AC |
361 | tree gnu_type; |
362 | ||
a1ab4c31 AC |
363 | /* If there was no equivalent type (can only happen when just annotating |
364 | types) or underlying type, go back to the original type. */ | |
bf0b0e5e AC |
365 | if (No (gnat_equiv)) |
366 | gnat_equiv = gnat_type; | |
a1ab4c31 AC |
367 | |
368 | /* If it there already a dummy type, use that one. Else make one. */ | |
bf0b0e5e AC |
369 | if (PRESENT_DUMMY_NODE (gnat_equiv)) |
370 | return GET_DUMMY_NODE (gnat_equiv); | |
a1ab4c31 AC |
371 | |
372 | /* If this is a record, make a RECORD_TYPE or UNION_TYPE; else make | |
373 | an ENUMERAL_TYPE. */ | |
bf0b0e5e AC |
374 | gnu_type = make_node (Is_Record_Type (gnat_equiv) |
375 | ? tree_code_for_record_type (gnat_equiv) | |
a1ab4c31 AC |
376 | : ENUMERAL_TYPE); |
377 | TYPE_NAME (gnu_type) = get_entity_name (gnat_type); | |
378 | TYPE_DUMMY_P (gnu_type) = 1; | |
10069d53 EB |
379 | TYPE_STUB_DECL (gnu_type) |
380 | = create_type_stub_decl (TYPE_NAME (gnu_type), gnu_type); | |
bf0b0e5e | 381 | if (Is_By_Reference_Type (gnat_equiv)) |
a0b8b1b7 | 382 | TYPE_BY_REFERENCE_P (gnu_type) = 1; |
a1ab4c31 | 383 | |
bf0b0e5e | 384 | SET_DUMMY_NODE (gnat_equiv, gnu_type); |
a1ab4c31 AC |
385 | |
386 | return gnu_type; | |
387 | } | |
e3edbd56 EB |
388 | |
389 | /* Return the dummy type that was made for GNAT_TYPE, if any. */ | |
390 | ||
391 | tree | |
392 | get_dummy_type (Entity_Id gnat_type) | |
393 | { | |
394 | return GET_DUMMY_NODE (gnat_type); | |
395 | } | |
396 | ||
397 | /* Build dummy fat and thin pointer types whose designated type is specified | |
398 | by GNAT_DESIG_TYPE/GNU_DESIG_TYPE and attach them to the latter. */ | |
399 | ||
400 | void | |
401 | build_dummy_unc_pointer_types (Entity_Id gnat_desig_type, tree gnu_desig_type) | |
402 | { | |
403 | tree gnu_template_type, gnu_ptr_template, gnu_array_type, gnu_ptr_array; | |
404 | tree gnu_fat_type, fields, gnu_object_type; | |
405 | ||
406 | gnu_template_type = make_node (RECORD_TYPE); | |
407 | TYPE_NAME (gnu_template_type) = create_concat_name (gnat_desig_type, "XUB"); | |
408 | TYPE_DUMMY_P (gnu_template_type) = 1; | |
409 | gnu_ptr_template = build_pointer_type (gnu_template_type); | |
410 | ||
411 | gnu_array_type = make_node (ENUMERAL_TYPE); | |
412 | TYPE_NAME (gnu_array_type) = create_concat_name (gnat_desig_type, "XUA"); | |
413 | TYPE_DUMMY_P (gnu_array_type) = 1; | |
414 | gnu_ptr_array = build_pointer_type (gnu_array_type); | |
415 | ||
416 | gnu_fat_type = make_node (RECORD_TYPE); | |
417 | /* Build a stub DECL to trigger the special processing for fat pointer types | |
418 | in gnat_pushdecl. */ | |
419 | TYPE_NAME (gnu_fat_type) | |
420 | = create_type_stub_decl (create_concat_name (gnat_desig_type, "XUP"), | |
421 | gnu_fat_type); | |
422 | fields = create_field_decl (get_identifier ("P_ARRAY"), gnu_ptr_array, | |
423 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
424 | DECL_CHAIN (fields) | |
425 | = create_field_decl (get_identifier ("P_BOUNDS"), gnu_ptr_template, | |
426 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
427 | finish_fat_pointer_type (gnu_fat_type, fields); | |
428 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_desig_type); | |
429 | /* Suppress debug info until after the type is completed. */ | |
430 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (gnu_fat_type)) = 1; | |
431 | ||
432 | gnu_object_type = make_node (RECORD_TYPE); | |
433 | TYPE_NAME (gnu_object_type) = create_concat_name (gnat_desig_type, "XUT"); | |
434 | TYPE_DUMMY_P (gnu_object_type) = 1; | |
435 | ||
436 | TYPE_POINTER_TO (gnu_desig_type) = gnu_fat_type; | |
1e55d29a | 437 | TYPE_REFERENCE_TO (gnu_desig_type) = gnu_fat_type; |
e3edbd56 EB |
438 | TYPE_OBJECT_RECORD_TYPE (gnu_desig_type) = gnu_object_type; |
439 | } | |
a1ab4c31 | 440 | \f |
c99c0026 | 441 | /* Return true if we are in the global binding level. */ |
a1ab4c31 | 442 | |
c99c0026 | 443 | bool |
a1ab4c31 AC |
444 | global_bindings_p (void) |
445 | { | |
7c775aca | 446 | return force_global || !current_function_decl; |
a1ab4c31 AC |
447 | } |
448 | ||
a09d56d8 | 449 | /* Enter a new binding level. */ |
a1ab4c31 AC |
450 | |
451 | void | |
c6bd4220 | 452 | gnat_pushlevel (void) |
a1ab4c31 AC |
453 | { |
454 | struct gnat_binding_level *newlevel = NULL; | |
455 | ||
456 | /* Reuse a struct for this binding level, if there is one. */ | |
457 | if (free_binding_level) | |
458 | { | |
459 | newlevel = free_binding_level; | |
460 | free_binding_level = free_binding_level->chain; | |
461 | } | |
462 | else | |
766090c2 | 463 | newlevel = ggc_alloc<gnat_binding_level> (); |
a1ab4c31 AC |
464 | |
465 | /* Use a free BLOCK, if any; otherwise, allocate one. */ | |
466 | if (free_block_chain) | |
467 | { | |
468 | newlevel->block = free_block_chain; | |
469 | free_block_chain = BLOCK_CHAIN (free_block_chain); | |
470 | BLOCK_CHAIN (newlevel->block) = NULL_TREE; | |
471 | } | |
472 | else | |
473 | newlevel->block = make_node (BLOCK); | |
474 | ||
475 | /* Point the BLOCK we just made to its parent. */ | |
476 | if (current_binding_level) | |
477 | BLOCK_SUPERCONTEXT (newlevel->block) = current_binding_level->block; | |
478 | ||
a09d56d8 EB |
479 | BLOCK_VARS (newlevel->block) = NULL_TREE; |
480 | BLOCK_SUBBLOCKS (newlevel->block) = NULL_TREE; | |
a1ab4c31 AC |
481 | TREE_USED (newlevel->block) = 1; |
482 | ||
a09d56d8 | 483 | /* Add this level to the front of the chain (stack) of active levels. */ |
a1ab4c31 AC |
484 | newlevel->chain = current_binding_level; |
485 | newlevel->jmpbuf_decl = NULL_TREE; | |
486 | current_binding_level = newlevel; | |
487 | } | |
488 | ||
489 | /* Set SUPERCONTEXT of the BLOCK for the current binding level to FNDECL | |
490 | and point FNDECL to this BLOCK. */ | |
491 | ||
492 | void | |
493 | set_current_block_context (tree fndecl) | |
494 | { | |
495 | BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl; | |
496 | DECL_INITIAL (fndecl) = current_binding_level->block; | |
a09d56d8 | 497 | set_block_for_group (current_binding_level->block); |
a1ab4c31 AC |
498 | } |
499 | ||
500 | /* Set the jmpbuf_decl for the current binding level to DECL. */ | |
501 | ||
502 | void | |
503 | set_block_jmpbuf_decl (tree decl) | |
504 | { | |
505 | current_binding_level->jmpbuf_decl = decl; | |
506 | } | |
507 | ||
508 | /* Get the jmpbuf_decl, if any, for the current binding level. */ | |
509 | ||
510 | tree | |
c6bd4220 | 511 | get_block_jmpbuf_decl (void) |
a1ab4c31 AC |
512 | { |
513 | return current_binding_level->jmpbuf_decl; | |
514 | } | |
515 | ||
a09d56d8 | 516 | /* Exit a binding level. Set any BLOCK into the current code group. */ |
a1ab4c31 AC |
517 | |
518 | void | |
c6bd4220 | 519 | gnat_poplevel (void) |
a1ab4c31 AC |
520 | { |
521 | struct gnat_binding_level *level = current_binding_level; | |
522 | tree block = level->block; | |
523 | ||
524 | BLOCK_VARS (block) = nreverse (BLOCK_VARS (block)); | |
72ac05b0 | 525 | BLOCK_SUBBLOCKS (block) = blocks_nreverse (BLOCK_SUBBLOCKS (block)); |
a1ab4c31 AC |
526 | |
527 | /* If this is a function-level BLOCK don't do anything. Otherwise, if there | |
528 | are no variables free the block and merge its subblocks into those of its | |
a09d56d8 | 529 | parent block. Otherwise, add it to the list of its parent. */ |
a1ab4c31 AC |
530 | if (TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL) |
531 | ; | |
7c775aca | 532 | else if (!BLOCK_VARS (block)) |
a1ab4c31 AC |
533 | { |
534 | BLOCK_SUBBLOCKS (level->chain->block) | |
61e46a7d NF |
535 | = block_chainon (BLOCK_SUBBLOCKS (block), |
536 | BLOCK_SUBBLOCKS (level->chain->block)); | |
a1ab4c31 AC |
537 | BLOCK_CHAIN (block) = free_block_chain; |
538 | free_block_chain = block; | |
539 | } | |
540 | else | |
541 | { | |
542 | BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (level->chain->block); | |
543 | BLOCK_SUBBLOCKS (level->chain->block) = block; | |
544 | TREE_USED (block) = 1; | |
545 | set_block_for_group (block); | |
546 | } | |
547 | ||
548 | /* Free this binding structure. */ | |
549 | current_binding_level = level->chain; | |
550 | level->chain = free_binding_level; | |
551 | free_binding_level = level; | |
552 | } | |
553 | ||
2231f17f EB |
554 | /* Exit a binding level and discard the associated BLOCK. */ |
555 | ||
556 | void | |
557 | gnat_zaplevel (void) | |
558 | { | |
559 | struct gnat_binding_level *level = current_binding_level; | |
560 | tree block = level->block; | |
561 | ||
562 | BLOCK_CHAIN (block) = free_block_chain; | |
563 | free_block_chain = block; | |
564 | ||
565 | /* Free this binding structure. */ | |
566 | current_binding_level = level->chain; | |
567 | level->chain = free_binding_level; | |
568 | free_binding_level = level; | |
569 | } | |
a1ab4c31 | 570 | \f |
4708440c EB |
571 | /* Set the context of TYPE and its parallel types (if any) to CONTEXT. */ |
572 | ||
573 | static void | |
574 | gnat_set_type_context (tree type, tree context) | |
575 | { | |
576 | tree decl = TYPE_STUB_DECL (type); | |
577 | ||
578 | TYPE_CONTEXT (type) = context; | |
579 | ||
580 | while (decl && DECL_PARALLEL_TYPE (decl)) | |
581 | { | |
24d4b3d5 AC |
582 | tree parallel_type = DECL_PARALLEL_TYPE (decl); |
583 | ||
584 | /* Give a context to the parallel types and their stub decl, if any. | |
585 | Some parallel types seems to be present in multiple parallel type | |
586 | chains, so don't mess with their context if they already have one. */ | |
7c775aca | 587 | if (!TYPE_CONTEXT (parallel_type)) |
24d4b3d5 | 588 | { |
7c775aca | 589 | if (TYPE_STUB_DECL (parallel_type)) |
24d4b3d5 AC |
590 | DECL_CONTEXT (TYPE_STUB_DECL (parallel_type)) = context; |
591 | TYPE_CONTEXT (parallel_type) = context; | |
592 | } | |
593 | ||
4708440c EB |
594 | decl = TYPE_STUB_DECL (DECL_PARALLEL_TYPE (decl)); |
595 | } | |
596 | } | |
597 | ||
9a30c7c4 AC |
598 | /* Return the innermost scope, starting at GNAT_NODE, we are be interested in |
599 | the debug info, or Empty if there is no such scope. If not NULL, set | |
600 | IS_SUBPROGRAM to whether the returned entity is a subprogram. */ | |
601 | ||
1d4b96e0 | 602 | Entity_Id |
9a30c7c4 AC |
603 | get_debug_scope (Node_Id gnat_node, bool *is_subprogram) |
604 | { | |
605 | Entity_Id gnat_entity; | |
606 | ||
607 | if (is_subprogram) | |
608 | *is_subprogram = false; | |
609 | ||
1d4b96e0 AC |
610 | if (Nkind (gnat_node) == N_Defining_Identifier |
611 | || Nkind (gnat_node) == N_Defining_Operator_Symbol) | |
9a30c7c4 AC |
612 | gnat_entity = Scope (gnat_node); |
613 | else | |
614 | return Empty; | |
615 | ||
616 | while (Present (gnat_entity)) | |
617 | { | |
618 | switch (Ekind (gnat_entity)) | |
619 | { | |
620 | case E_Function: | |
621 | case E_Procedure: | |
622 | if (Present (Protected_Body_Subprogram (gnat_entity))) | |
623 | gnat_entity = Protected_Body_Subprogram (gnat_entity); | |
624 | ||
625 | /* If the scope is a subprogram, then just rely on | |
626 | current_function_decl, so that we don't have to defer | |
627 | anything. This is needed because other places rely on the | |
628 | validity of the DECL_CONTEXT attribute of FUNCTION_DECL nodes. */ | |
629 | if (is_subprogram) | |
630 | *is_subprogram = true; | |
631 | return gnat_entity; | |
632 | ||
633 | case E_Record_Type: | |
634 | case E_Record_Subtype: | |
635 | return gnat_entity; | |
636 | ||
637 | default: | |
638 | /* By default, we are not interested in this particular scope: go to | |
639 | the outer one. */ | |
640 | break; | |
641 | } | |
7c775aca | 642 | |
9a30c7c4 AC |
643 | gnat_entity = Scope (gnat_entity); |
644 | } | |
7c775aca | 645 | |
9a30c7c4 AC |
646 | return Empty; |
647 | } | |
648 | ||
7c775aca EB |
649 | /* If N is NULL, set TYPE's context to CONTEXT. Defer this to the processing |
650 | of N otherwise. */ | |
9a30c7c4 AC |
651 | |
652 | static void | |
7c775aca | 653 | defer_or_set_type_context (tree type, tree context, |
9a30c7c4 AC |
654 | struct deferred_decl_context_node *n) |
655 | { | |
656 | if (n) | |
657 | add_deferred_type_context (n, type); | |
658 | else | |
659 | gnat_set_type_context (type, context); | |
660 | } | |
661 | ||
7c775aca | 662 | /* Return global_context, but create it first if need be. */ |
9a30c7c4 AC |
663 | |
664 | static tree | |
665 | get_global_context (void) | |
666 | { | |
667 | if (!global_context) | |
881a5e60 PMR |
668 | { |
669 | global_context = build_translation_unit_decl (NULL_TREE); | |
670 | debug_hooks->register_main_translation_unit (global_context); | |
671 | } | |
7c775aca | 672 | |
9a30c7c4 AC |
673 | return global_context; |
674 | } | |
675 | ||
228ee426 EB |
676 | /* Record DECL as belonging to the current lexical scope and use GNAT_NODE |
677 | for location information and flag propagation. */ | |
a1ab4c31 AC |
678 | |
679 | void | |
680 | gnat_pushdecl (tree decl, Node_Id gnat_node) | |
681 | { | |
9a30c7c4 AC |
682 | tree context = NULL_TREE; |
683 | struct deferred_decl_context_node *deferred_decl_context = NULL; | |
684 | ||
685 | /* If explicitely asked to make DECL global or if it's an imported nested | |
686 | object, short-circuit the regular Scope-based context computation. */ | |
687 | if (!((TREE_PUBLIC (decl) && DECL_EXTERNAL (decl)) || force_global == 1)) | |
a1ab4c31 | 688 | { |
9a30c7c4 AC |
689 | /* Rely on the GNAT scope, or fallback to the current_function_decl if |
690 | the GNAT scope reached the global scope, if it reached a subprogram | |
691 | or the declaration is a subprogram or a variable (for them we skip | |
692 | intermediate context types because the subprogram body elaboration | |
693 | machinery and the inliner both expect a subprogram context). | |
694 | ||
695 | Falling back to current_function_decl is necessary for implicit | |
696 | subprograms created by gigi, such as the elaboration subprograms. */ | |
697 | bool context_is_subprogram = false; | |
698 | const Entity_Id gnat_scope | |
699 | = get_debug_scope (gnat_node, &context_is_subprogram); | |
700 | ||
701 | if (Present (gnat_scope) | |
702 | && !context_is_subprogram | |
703 | && TREE_CODE (decl) != FUNCTION_DECL | |
704 | && TREE_CODE (decl) != VAR_DECL) | |
705 | /* Always assume the scope has not been elaborated, thus defer the | |
706 | context propagation to the time its elaboration will be | |
707 | available. */ | |
708 | deferred_decl_context | |
709 | = add_deferred_decl_context (decl, gnat_scope, force_global); | |
710 | ||
711 | /* External declarations (when force_global > 0) may not be in a | |
712 | local context. */ | |
7c775aca | 713 | else if (current_function_decl && force_global == 0) |
9a30c7c4 | 714 | context = current_function_decl; |
a1ab4c31 AC |
715 | } |
716 | ||
9a30c7c4 | 717 | /* If either we are forced to be in global mode or if both the GNAT scope and |
7c775aca | 718 | the current_function_decl did not help in determining the context, use the |
9a30c7c4 | 719 | global scope. */ |
7c775aca | 720 | if (!deferred_decl_context && !context) |
9a30c7c4 AC |
721 | context = get_global_context (); |
722 | ||
723 | /* Functions imported in another function are not really nested. | |
724 | For really nested functions mark them initially as needing | |
725 | a static chain for uses of that flag before unnesting; | |
726 | lower_nested_functions will then recompute it. */ | |
727 | if (TREE_CODE (decl) == FUNCTION_DECL | |
728 | && !TREE_PUBLIC (decl) | |
7c775aca | 729 | && context |
9a30c7c4 | 730 | && (TREE_CODE (context) == FUNCTION_DECL |
7c775aca | 731 | || decl_function_context (context))) |
9a30c7c4 AC |
732 | DECL_STATIC_CHAIN (decl) = 1; |
733 | ||
734 | if (!deferred_decl_context) | |
735 | DECL_CONTEXT (decl) = context; | |
736 | ||
228ee426 | 737 | TREE_NO_WARNING (decl) = (No (gnat_node) || Warnings_Off (gnat_node)); |
a1ab4c31 AC |
738 | |
739 | /* Set the location of DECL and emit a declaration for it. */ | |
e8fa3dcd | 740 | if (Present (gnat_node) && !renaming_from_generic_instantiation_p (gnat_node)) |
a1ab4c31 | 741 | Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (decl)); |
228ee426 | 742 | |
a1ab4c31 AC |
743 | add_decl_expr (decl, gnat_node); |
744 | ||
745 | /* Put the declaration on the list. The list of declarations is in reverse | |
2231f17f EB |
746 | order. The list will be reversed later. Put global declarations in the |
747 | globals list and local ones in the current block. But skip TYPE_DECLs | |
748 | for UNCONSTRAINED_ARRAY_TYPE in both cases, as they will cause trouble | |
749 | with the debugger and aren't needed anyway. */ | |
750 | if (!(TREE_CODE (decl) == TYPE_DECL | |
751 | && TREE_CODE (TREE_TYPE (decl)) == UNCONSTRAINED_ARRAY_TYPE)) | |
a1ab4c31 | 752 | { |
9083aacd | 753 | if (DECL_EXTERNAL (decl)) |
a1ab4c31 | 754 | { |
a1ab4c31 | 755 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)) |
9771b263 | 756 | vec_safe_push (builtin_decls, decl); |
a1ab4c31 | 757 | } |
9083aacd | 758 | else if (global_bindings_p ()) |
a22b794d | 759 | vec_safe_push (global_decls, decl); |
9083aacd | 760 | else |
a1ab4c31 | 761 | { |
a963da4d EB |
762 | DECL_CHAIN (decl) = BLOCK_VARS (current_binding_level->block); |
763 | BLOCK_VARS (current_binding_level->block) = decl; | |
a1ab4c31 AC |
764 | } |
765 | } | |
766 | ||
aef308d0 | 767 | /* For the declaration of a type, set its name either if it isn't already |
10069d53 | 768 | set or if the previous type name was not derived from a source name. |
a1ab4c31 | 769 | We'd rather have the type named with a real name and all the pointer |
aef308d0 PMR |
770 | types to the same object have the same node, except when the names are |
771 | both derived from source names. */ | |
a1ab4c31 AC |
772 | if (TREE_CODE (decl) == TYPE_DECL && DECL_NAME (decl)) |
773 | { | |
774 | tree t = TREE_TYPE (decl); | |
775 | ||
79714815 EB |
776 | /* Array and pointer types aren't tagged types in the C sense so we need |
777 | to generate a typedef in DWARF for them and make sure it is preserved, | |
778 | unless the type is artificial. */ | |
aef308d0 | 779 | if (!(TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL) |
79714815 EB |
780 | && ((TREE_CODE (t) != ARRAY_TYPE && TREE_CODE (t) != POINTER_TYPE) |
781 | || DECL_ARTIFICIAL (decl))) | |
782 | ; | |
783 | /* For array and pointer types, create the DECL_ORIGINAL_TYPE that will | |
784 | generate the typedef in DWARF. Also do that for fat pointer types | |
785 | because, even though they are tagged types in the C sense, they are | |
786 | still XUP types attached to the base array type at this point. */ | |
aef308d0 | 787 | else if (!DECL_ARTIFICIAL (decl) |
79714815 EB |
788 | && (TREE_CODE (t) == ARRAY_TYPE |
789 | || TREE_CODE (t) == POINTER_TYPE | |
790 | || TYPE_IS_FAT_POINTER_P (t))) | |
a1ab4c31 | 791 | { |
d42b7559 | 792 | tree tt = build_variant_type_copy (t); |
a1ab4c31 | 793 | TYPE_NAME (tt) = decl; |
9a30c7c4 AC |
794 | defer_or_set_type_context (tt, |
795 | DECL_CONTEXT (decl), | |
796 | deferred_decl_context); | |
a1ab4c31 | 797 | TREE_TYPE (decl) = tt; |
79714815 | 798 | if (TYPE_NAME (t) |
aef308d0 PMR |
799 | && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL |
800 | && DECL_ORIGINAL_TYPE (TYPE_NAME (t))) | |
40c88b94 EB |
801 | DECL_ORIGINAL_TYPE (decl) = DECL_ORIGINAL_TYPE (TYPE_NAME (t)); |
802 | else | |
803 | DECL_ORIGINAL_TYPE (decl) = t; | |
79714815 EB |
804 | /* Array types need to have a name so that they can be related to |
805 | their GNAT encodings. */ | |
806 | if (TREE_CODE (t) == ARRAY_TYPE && !TYPE_NAME (t)) | |
807 | TYPE_NAME (t) = DECL_NAME (decl); | |
e3edbd56 | 808 | t = NULL_TREE; |
a1ab4c31 | 809 | } |
79714815 | 810 | else if (TYPE_NAME (t) |
aef308d0 PMR |
811 | && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL |
812 | && DECL_ARTIFICIAL (TYPE_NAME (t)) && !DECL_ARTIFICIAL (decl)) | |
a1ab4c31 AC |
813 | ; |
814 | else | |
815 | t = NULL_TREE; | |
816 | ||
79714815 EB |
817 | /* Propagate the name to all the variants, this is needed for the type |
818 | qualifiers machinery to work properly (see check_qualified_type). | |
819 | Also propagate the context to them. Note that it will be propagated | |
820 | to all parallel types too thanks to gnat_set_type_context. */ | |
a1ab4c31 AC |
821 | if (t) |
822 | for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t)) | |
79714815 EB |
823 | /* ??? Because of the previous kludge, we can have variants of fat |
824 | pointer types with different names. */ | |
825 | if (!(TYPE_IS_FAT_POINTER_P (t) | |
826 | && TYPE_NAME (t) | |
827 | && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)) | |
d4d05b52 EB |
828 | { |
829 | TYPE_NAME (t) = decl; | |
9a30c7c4 AC |
830 | defer_or_set_type_context (t, |
831 | DECL_CONTEXT (decl), | |
832 | deferred_decl_context); | |
d4d05b52 | 833 | } |
a1ab4c31 AC |
834 | } |
835 | } | |
836 | \f | |
842d4ee2 EB |
837 | /* Create a record type that contains a SIZE bytes long field of TYPE with a |
838 | starting bit position so that it is aligned to ALIGN bits, and leaving at | |
839 | least ROOM bytes free before the field. BASE_ALIGN is the alignment the | |
0746af5e EB |
840 | record is guaranteed to get. GNAT_NODE is used for the position of the |
841 | associated TYPE_DECL. */ | |
842d4ee2 EB |
842 | |
843 | tree | |
844 | make_aligning_type (tree type, unsigned int align, tree size, | |
0746af5e | 845 | unsigned int base_align, int room, Node_Id gnat_node) |
842d4ee2 EB |
846 | { |
847 | /* We will be crafting a record type with one field at a position set to be | |
848 | the next multiple of ALIGN past record'address + room bytes. We use a | |
849 | record placeholder to express record'address. */ | |
850 | tree record_type = make_node (RECORD_TYPE); | |
851 | tree record = build0 (PLACEHOLDER_EXPR, record_type); | |
852 | ||
853 | tree record_addr_st | |
854 | = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record)); | |
855 | ||
856 | /* The diagram below summarizes the shape of what we manipulate: | |
857 | ||
858 | <--------- pos ----------> | |
859 | { +------------+-------------+-----------------+ | |
860 | record =>{ |############| ... | field (type) | | |
861 | { +------------+-------------+-----------------+ | |
862 | |<-- room -->|<- voffset ->|<---- size ----->| | |
863 | o o | |
864 | | | | |
865 | record_addr vblock_addr | |
866 | ||
867 | Every length is in sizetype bytes there, except "pos" which has to be | |
868 | set as a bit position in the GCC tree for the record. */ | |
869 | tree room_st = size_int (room); | |
870 | tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st); | |
871 | tree voffset_st, pos, field; | |
872 | ||
9dba4b55 | 873 | tree name = TYPE_IDENTIFIER (type); |
842d4ee2 | 874 | |
842d4ee2 EB |
875 | name = concat_name (name, "ALIGN"); |
876 | TYPE_NAME (record_type) = name; | |
877 | ||
878 | /* Compute VOFFSET and then POS. The next byte position multiple of some | |
879 | alignment after some address is obtained by "and"ing the alignment minus | |
880 | 1 with the two's complement of the address. */ | |
881 | voffset_st = size_binop (BIT_AND_EXPR, | |
882 | fold_build1 (NEGATE_EXPR, sizetype, vblock_addr_st), | |
883 | size_int ((align / BITS_PER_UNIT) - 1)); | |
884 | ||
885 | /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */ | |
886 | pos = size_binop (MULT_EXPR, | |
887 | convert (bitsizetype, | |
888 | size_binop (PLUS_EXPR, room_st, voffset_st)), | |
889 | bitsize_unit_node); | |
890 | ||
891 | /* Craft the GCC record representation. We exceptionally do everything | |
892 | manually here because 1) our generic circuitry is not quite ready to | |
893 | handle the complex position/size expressions we are setting up, 2) we | |
894 | have a strong simplifying factor at hand: we know the maximum possible | |
895 | value of voffset, and 3) we have to set/reset at least the sizes in | |
896 | accordance with this maximum value anyway, as we need them to convey | |
897 | what should be "alloc"ated for this type. | |
898 | ||
899 | Use -1 as the 'addressable' indication for the field to prevent the | |
900 | creation of a bitfield. We don't need one, it would have damaging | |
901 | consequences on the alignment computation, and create_field_decl would | |
902 | make one without this special argument, for instance because of the | |
903 | complex position expression. */ | |
904 | field = create_field_decl (get_identifier ("F"), type, record_type, size, | |
905 | pos, 1, -1); | |
906 | TYPE_FIELDS (record_type) = field; | |
907 | ||
fe37c7af | 908 | SET_TYPE_ALIGN (record_type, base_align); |
842d4ee2 EB |
909 | TYPE_USER_ALIGN (record_type) = 1; |
910 | ||
911 | TYPE_SIZE (record_type) | |
912 | = size_binop (PLUS_EXPR, | |
913 | size_binop (MULT_EXPR, convert (bitsizetype, size), | |
914 | bitsize_unit_node), | |
915 | bitsize_int (align + room * BITS_PER_UNIT)); | |
916 | TYPE_SIZE_UNIT (record_type) | |
917 | = size_binop (PLUS_EXPR, size, | |
918 | size_int (room + align / BITS_PER_UNIT)); | |
919 | ||
920 | SET_TYPE_MODE (record_type, BLKmode); | |
921 | relate_alias_sets (record_type, type, ALIAS_SET_COPY); | |
922 | ||
923 | /* Declare it now since it will never be declared otherwise. This is | |
924 | necessary to ensure that its subtrees are properly marked. */ | |
74746d49 | 925 | create_type_decl (name, record_type, true, false, gnat_node); |
842d4ee2 EB |
926 | |
927 | return record_type; | |
928 | } | |
929 | ||
930 | /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used | |
931 | as the field type of a packed record if IN_RECORD is true, or as the | |
932 | component type of a packed array if IN_RECORD is false. See if we can | |
b3f75672 EB |
933 | rewrite it either as a type that has non-BLKmode, which we can pack |
934 | tighter in the packed record case, or as a smaller type with at most | |
935 | MAX_ALIGN alignment if the value is non-zero. If so, return the new | |
936 | type; if not, return the original type. */ | |
842d4ee2 EB |
937 | |
938 | tree | |
b3f75672 | 939 | make_packable_type (tree type, bool in_record, unsigned int max_align) |
842d4ee2 | 940 | { |
ae7e9ddd | 941 | unsigned HOST_WIDE_INT size = tree_to_uhwi (TYPE_SIZE (type)); |
842d4ee2 | 942 | unsigned HOST_WIDE_INT new_size; |
b3f75672 EB |
943 | unsigned int align = TYPE_ALIGN (type); |
944 | unsigned int new_align; | |
842d4ee2 EB |
945 | |
946 | /* No point in doing anything if the size is zero. */ | |
947 | if (size == 0) | |
948 | return type; | |
949 | ||
b3f75672 | 950 | tree new_type = make_node (TREE_CODE (type)); |
842d4ee2 EB |
951 | |
952 | /* Copy the name and flags from the old type to that of the new. | |
953 | Note that we rely on the pointer equality created here for | |
954 | TYPE_NAME to look through conversions in various places. */ | |
955 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
956 | TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type); | |
957 | TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type); | |
ee45a32d | 958 | TYPE_REVERSE_STORAGE_ORDER (new_type) = TYPE_REVERSE_STORAGE_ORDER (type); |
842d4ee2 EB |
959 | if (TREE_CODE (type) == RECORD_TYPE) |
960 | TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type); | |
961 | ||
962 | /* If we are in a record and have a small size, set the alignment to | |
963 | try for an integral mode. Otherwise set it to try for a smaller | |
964 | type with BLKmode. */ | |
965 | if (in_record && size <= MAX_FIXED_MODE_SIZE) | |
966 | { | |
b3f75672 EB |
967 | new_size = ceil_pow2 (size); |
968 | new_align = MIN (new_size, BIGGEST_ALIGNMENT); | |
969 | SET_TYPE_ALIGN (new_type, new_align); | |
842d4ee2 EB |
970 | } |
971 | else | |
972 | { | |
842d4ee2 EB |
973 | /* Do not try to shrink the size if the RM size is not constant. */ |
974 | if (TYPE_CONTAINS_TEMPLATE_P (type) | |
cc269bb6 | 975 | || !tree_fits_uhwi_p (TYPE_ADA_SIZE (type))) |
842d4ee2 EB |
976 | return type; |
977 | ||
978 | /* Round the RM size up to a unit boundary to get the minimal size | |
b3f75672 EB |
979 | for a BLKmode record. Give up if it's already the size and we |
980 | don't need to lower the alignment. */ | |
eb1ce453 | 981 | new_size = tree_to_uhwi (TYPE_ADA_SIZE (type)); |
842d4ee2 | 982 | new_size = (new_size + BITS_PER_UNIT - 1) & -BITS_PER_UNIT; |
b3f75672 | 983 | if (new_size == size && (max_align == 0 || align <= max_align)) |
842d4ee2 EB |
984 | return type; |
985 | ||
b3f75672 EB |
986 | new_align = MIN (new_size & -new_size, BIGGEST_ALIGNMENT); |
987 | if (max_align > 0 && new_align > max_align) | |
988 | new_align = max_align; | |
989 | SET_TYPE_ALIGN (new_type, MIN (align, new_align)); | |
842d4ee2 EB |
990 | } |
991 | ||
992 | TYPE_USER_ALIGN (new_type) = 1; | |
993 | ||
994 | /* Now copy the fields, keeping the position and size as we don't want | |
995 | to change the layout by propagating the packedness downwards. */ | |
b3f75672 EB |
996 | tree new_field_list = NULL_TREE; |
997 | for (tree field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) | |
842d4ee2 | 998 | { |
b3f75672 | 999 | tree new_field_type = TREE_TYPE (field); |
842d4ee2 EB |
1000 | tree new_field, new_size; |
1001 | ||
1002 | if (RECORD_OR_UNION_TYPE_P (new_field_type) | |
1003 | && !TYPE_FAT_POINTER_P (new_field_type) | |
cc269bb6 | 1004 | && tree_fits_uhwi_p (TYPE_SIZE (new_field_type))) |
b3f75672 | 1005 | new_field_type = make_packable_type (new_field_type, true, max_align); |
842d4ee2 EB |
1006 | |
1007 | /* However, for the last field in a not already packed record type | |
1008 | that is of an aggregate type, we need to use the RM size in the | |
1009 | packable version of the record type, see finish_record_type. */ | |
b3f75672 | 1010 | if (!DECL_CHAIN (field) |
842d4ee2 EB |
1011 | && !TYPE_PACKED (type) |
1012 | && RECORD_OR_UNION_TYPE_P (new_field_type) | |
1013 | && !TYPE_FAT_POINTER_P (new_field_type) | |
1014 | && !TYPE_CONTAINS_TEMPLATE_P (new_field_type) | |
1015 | && TYPE_ADA_SIZE (new_field_type)) | |
1016 | new_size = TYPE_ADA_SIZE (new_field_type); | |
1017 | else | |
b3f75672 | 1018 | new_size = DECL_SIZE (field); |
842d4ee2 EB |
1019 | |
1020 | new_field | |
b3f75672 EB |
1021 | = create_field_decl (DECL_NAME (field), new_field_type, new_type, |
1022 | new_size, bit_position (field), | |
842d4ee2 | 1023 | TYPE_PACKED (type), |
b3f75672 | 1024 | !DECL_NONADDRESSABLE_P (field)); |
842d4ee2 | 1025 | |
b3f75672 EB |
1026 | DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (field); |
1027 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field); | |
842d4ee2 | 1028 | if (TREE_CODE (new_type) == QUAL_UNION_TYPE) |
b3f75672 | 1029 | DECL_QUALIFIER (new_field) = DECL_QUALIFIER (field); |
842d4ee2 | 1030 | |
b3f75672 EB |
1031 | DECL_CHAIN (new_field) = new_field_list; |
1032 | new_field_list = new_field; | |
842d4ee2 EB |
1033 | } |
1034 | ||
b3f75672 | 1035 | finish_record_type (new_type, nreverse (new_field_list), 2, false); |
842d4ee2 | 1036 | relate_alias_sets (new_type, type, ALIAS_SET_COPY); |
44e9e3ec EB |
1037 | if (TYPE_STUB_DECL (type)) |
1038 | SET_DECL_PARALLEL_TYPE (TYPE_STUB_DECL (new_type), | |
1039 | DECL_PARALLEL_TYPE (TYPE_STUB_DECL (type))); | |
842d4ee2 EB |
1040 | |
1041 | /* If this is a padding record, we never want to make the size smaller | |
1042 | than what was specified. For QUAL_UNION_TYPE, also copy the size. */ | |
1043 | if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE) | |
1044 | { | |
1045 | TYPE_SIZE (new_type) = TYPE_SIZE (type); | |
1046 | TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type); | |
1047 | new_size = size; | |
1048 | } | |
1049 | else | |
1050 | { | |
1051 | TYPE_SIZE (new_type) = bitsize_int (new_size); | |
b3f75672 | 1052 | TYPE_SIZE_UNIT (new_type) = size_int (new_size / BITS_PER_UNIT); |
842d4ee2 EB |
1053 | } |
1054 | ||
1055 | if (!TYPE_CONTAINS_TEMPLATE_P (type)) | |
1056 | SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type)); | |
1057 | ||
1058 | compute_record_mode (new_type); | |
1059 | ||
1060 | /* Try harder to get a packable type if necessary, for example | |
1061 | in case the record itself contains a BLKmode field. */ | |
1062 | if (in_record && TYPE_MODE (new_type) == BLKmode) | |
1063 | SET_TYPE_MODE (new_type, | |
1064 | mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1)); | |
1065 | ||
b3f75672 EB |
1066 | /* If neither mode nor size nor alignment shrunk, return the old type. */ |
1067 | if (TYPE_MODE (new_type) == BLKmode && new_size >= size && max_align == 0) | |
842d4ee2 EB |
1068 | return type; |
1069 | ||
1070 | return new_type; | |
1071 | } | |
1072 | ||
1073 | /* Given a type TYPE, return a new type whose size is appropriate for SIZE. | |
1074 | If TYPE is the best type, return it. Otherwise, make a new type. We | |
1075 | only support new integral and pointer types. FOR_BIASED is true if | |
1076 | we are making a biased type. */ | |
1077 | ||
1078 | tree | |
1079 | make_type_from_size (tree type, tree size_tree, bool for_biased) | |
1080 | { | |
1081 | unsigned HOST_WIDE_INT size; | |
1082 | bool biased_p; | |
1083 | tree new_type; | |
1084 | ||
1085 | /* If size indicates an error, just return TYPE to avoid propagating | |
1086 | the error. Likewise if it's too large to represent. */ | |
cc269bb6 | 1087 | if (!size_tree || !tree_fits_uhwi_p (size_tree)) |
842d4ee2 EB |
1088 | return type; |
1089 | ||
ae7e9ddd | 1090 | size = tree_to_uhwi (size_tree); |
842d4ee2 EB |
1091 | |
1092 | switch (TREE_CODE (type)) | |
1093 | { | |
1094 | case INTEGER_TYPE: | |
1095 | case ENUMERAL_TYPE: | |
1096 | case BOOLEAN_TYPE: | |
1097 | biased_p = (TREE_CODE (type) == INTEGER_TYPE | |
1098 | && TYPE_BIASED_REPRESENTATION_P (type)); | |
1099 | ||
1100 | /* Integer types with precision 0 are forbidden. */ | |
1101 | if (size == 0) | |
1102 | size = 1; | |
1103 | ||
1104 | /* Only do something if the type isn't a packed array type and doesn't | |
1105 | already have the proper size and the size isn't too large. */ | |
1106 | if (TYPE_IS_PACKED_ARRAY_TYPE_P (type) | |
1107 | || (TYPE_PRECISION (type) == size && biased_p == for_biased) | |
1108 | || size > LONG_LONG_TYPE_SIZE) | |
1109 | break; | |
1110 | ||
1111 | biased_p |= for_biased; | |
55c8849f EB |
1112 | |
1113 | /* The type should be an unsigned type if the original type is unsigned | |
1114 | or if the lower bound is constant and non-negative or if the type is | |
1115 | biased, see E_Signed_Integer_Subtype case of gnat_to_gnu_entity. */ | |
1116 | if (TYPE_UNSIGNED (type) | |
1117 | || (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST | |
1118 | && tree_int_cst_sgn (TYPE_MIN_VALUE (type)) >= 0) | |
1119 | || biased_p) | |
842d4ee2 EB |
1120 | new_type = make_unsigned_type (size); |
1121 | else | |
1122 | new_type = make_signed_type (size); | |
1123 | TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type; | |
1eb58520 AC |
1124 | SET_TYPE_RM_MIN_VALUE (new_type, TYPE_MIN_VALUE (type)); |
1125 | SET_TYPE_RM_MAX_VALUE (new_type, TYPE_MAX_VALUE (type)); | |
842d4ee2 EB |
1126 | /* Copy the name to show that it's essentially the same type and |
1127 | not a subrange type. */ | |
1128 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
1129 | TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p; | |
1130 | SET_TYPE_RM_SIZE (new_type, bitsize_int (size)); | |
1131 | return new_type; | |
1132 | ||
1133 | case RECORD_TYPE: | |
1134 | /* Do something if this is a fat pointer, in which case we | |
1135 | may need to return the thin pointer. */ | |
1136 | if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2) | |
1137 | { | |
ef4bddc2 | 1138 | machine_mode p_mode = mode_for_size (size, MODE_INT, 0); |
842d4ee2 EB |
1139 | if (!targetm.valid_pointer_mode (p_mode)) |
1140 | p_mode = ptr_mode; | |
1141 | return | |
1142 | build_pointer_type_for_mode | |
1143 | (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)), | |
1144 | p_mode, 0); | |
1145 | } | |
1146 | break; | |
1147 | ||
1148 | case POINTER_TYPE: | |
1149 | /* Only do something if this is a thin pointer, in which case we | |
1150 | may need to return the fat pointer. */ | |
1151 | if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2) | |
1152 | return | |
1153 | build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))); | |
1154 | break; | |
1155 | ||
1156 | default: | |
1157 | break; | |
1158 | } | |
1159 | ||
1160 | return type; | |
1161 | } | |
1162 | ||
1163 | /* See if the data pointed to by the hash table slot is marked. */ | |
1164 | ||
08ec2754 RS |
1165 | int |
1166 | pad_type_hasher::keep_cache_entry (pad_type_hash *&t) | |
842d4ee2 | 1167 | { |
08ec2754 | 1168 | return ggc_marked_p (t->type); |
842d4ee2 EB |
1169 | } |
1170 | ||
d242408f | 1171 | /* Return true iff the padded types are equivalent. */ |
842d4ee2 | 1172 | |
d242408f TS |
1173 | bool |
1174 | pad_type_hasher::equal (pad_type_hash *t1, pad_type_hash *t2) | |
842d4ee2 | 1175 | { |
842d4ee2 EB |
1176 | tree type1, type2; |
1177 | ||
1178 | if (t1->hash != t2->hash) | |
1179 | return 0; | |
1180 | ||
1181 | type1 = t1->type; | |
1182 | type2 = t2->type; | |
1183 | ||
ee45a32d EB |
1184 | /* We consider that the padded types are equivalent if they pad the same type |
1185 | and have the same size, alignment, RM size and storage order. Taking the | |
1186 | mode into account is redundant since it is determined by the others. */ | |
842d4ee2 EB |
1187 | return |
1188 | TREE_TYPE (TYPE_FIELDS (type1)) == TREE_TYPE (TYPE_FIELDS (type2)) | |
1189 | && TYPE_SIZE (type1) == TYPE_SIZE (type2) | |
1190 | && TYPE_ALIGN (type1) == TYPE_ALIGN (type2) | |
ee45a32d EB |
1191 | && TYPE_ADA_SIZE (type1) == TYPE_ADA_SIZE (type2) |
1192 | && TYPE_REVERSE_STORAGE_ORDER (type1) == TYPE_REVERSE_STORAGE_ORDER (type2); | |
842d4ee2 EB |
1193 | } |
1194 | ||
5cb7516d EB |
1195 | /* Look up the padded TYPE in the hash table and return its canonical version |
1196 | if it exists; otherwise, insert it into the hash table. */ | |
1197 | ||
1198 | static tree | |
1199 | lookup_and_insert_pad_type (tree type) | |
1200 | { | |
1201 | hashval_t hashcode; | |
1202 | struct pad_type_hash in, *h; | |
5cb7516d EB |
1203 | |
1204 | hashcode | |
1205 | = iterative_hash_object (TYPE_HASH (TREE_TYPE (TYPE_FIELDS (type))), 0); | |
1206 | hashcode = iterative_hash_expr (TYPE_SIZE (type), hashcode); | |
1207 | hashcode = iterative_hash_hashval_t (TYPE_ALIGN (type), hashcode); | |
1208 | hashcode = iterative_hash_expr (TYPE_ADA_SIZE (type), hashcode); | |
1209 | ||
1210 | in.hash = hashcode; | |
1211 | in.type = type; | |
d242408f | 1212 | h = pad_type_hash_table->find_with_hash (&in, hashcode); |
5cb7516d EB |
1213 | if (h) |
1214 | return h->type; | |
1215 | ||
1216 | h = ggc_alloc<pad_type_hash> (); | |
1217 | h->hash = hashcode; | |
1218 | h->type = type; | |
d242408f | 1219 | *pad_type_hash_table->find_slot_with_hash (h, hashcode, INSERT) = h; |
5cb7516d EB |
1220 | return NULL_TREE; |
1221 | } | |
1222 | ||
842d4ee2 | 1223 | /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type |
5cb7516d | 1224 | if needed. We have already verified that SIZE and ALIGN are large enough. |
842d4ee2 EB |
1225 | GNAT_ENTITY is used to name the resulting record and to issue a warning. |
1226 | IS_COMPONENT_TYPE is true if this is being done for the component type of | |
1227 | an array. IS_USER_TYPE is true if the original type needs to be completed. | |
1228 | DEFINITION is true if this type is being defined. SET_RM_SIZE is true if | |
afc737f0 EB |
1229 | the RM size of the resulting type is to be set to SIZE too; in this case, |
1230 | the padded type is canonicalized before being returned. */ | |
842d4ee2 EB |
1231 | |
1232 | tree | |
1233 | maybe_pad_type (tree type, tree size, unsigned int align, | |
1234 | Entity_Id gnat_entity, bool is_component_type, | |
1235 | bool is_user_type, bool definition, bool set_rm_size) | |
1236 | { | |
1237 | tree orig_size = TYPE_SIZE (type); | |
44e9e3ec | 1238 | unsigned int orig_align = TYPE_ALIGN (type); |
842d4ee2 EB |
1239 | tree record, field; |
1240 | ||
1241 | /* If TYPE is a padded type, see if it agrees with any size and alignment | |
1242 | we were given. If so, return the original type. Otherwise, strip | |
1243 | off the padding, since we will either be returning the inner type | |
1244 | or repadding it. If no size or alignment is specified, use that of | |
1245 | the original padded type. */ | |
1246 | if (TYPE_IS_PADDING_P (type)) | |
1247 | { | |
1248 | if ((!size | |
44e9e3ec EB |
1249 | || operand_equal_p (round_up (size, orig_align), orig_size, 0)) |
1250 | && (align == 0 || align == orig_align)) | |
842d4ee2 EB |
1251 | return type; |
1252 | ||
1253 | if (!size) | |
44e9e3ec | 1254 | size = orig_size; |
842d4ee2 | 1255 | if (align == 0) |
44e9e3ec | 1256 | align = orig_align; |
842d4ee2 EB |
1257 | |
1258 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
1259 | orig_size = TYPE_SIZE (type); | |
44e9e3ec | 1260 | orig_align = TYPE_ALIGN (type); |
842d4ee2 EB |
1261 | } |
1262 | ||
1263 | /* If the size is either not being changed or is being made smaller (which | |
1264 | is not done here and is only valid for bitfields anyway), show the size | |
1265 | isn't changing. Likewise, clear the alignment if it isn't being | |
1266 | changed. Then return if we aren't doing anything. */ | |
1267 | if (size | |
1268 | && (operand_equal_p (size, orig_size, 0) | |
1269 | || (TREE_CODE (orig_size) == INTEGER_CST | |
1270 | && tree_int_cst_lt (size, orig_size)))) | |
1271 | size = NULL_TREE; | |
1272 | ||
44e9e3ec | 1273 | if (align == orig_align) |
842d4ee2 EB |
1274 | align = 0; |
1275 | ||
1276 | if (align == 0 && !size) | |
1277 | return type; | |
1278 | ||
1279 | /* If requested, complete the original type and give it a name. */ | |
1280 | if (is_user_type) | |
1281 | create_type_decl (get_entity_name (gnat_entity), type, | |
74746d49 | 1282 | !Comes_From_Source (gnat_entity), |
842d4ee2 EB |
1283 | !(TYPE_NAME (type) |
1284 | && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
1285 | && DECL_IGNORED_P (TYPE_NAME (type))), | |
1286 | gnat_entity); | |
1287 | ||
1288 | /* We used to modify the record in place in some cases, but that could | |
1289 | generate incorrect debugging information. So make a new record | |
1290 | type and name. */ | |
1291 | record = make_node (RECORD_TYPE); | |
1292 | TYPE_PADDING_P (record) = 1; | |
1293 | ||
7c775aca | 1294 | /* ??? Padding types around packed array implementation types will be |
2d595887 PMR |
1295 | considered as root types in the array descriptor language hook (see |
1296 | gnat_get_array_descr_info). Give them the original packed array type | |
1297 | name so that the one coming from sources appears in the debugging | |
1298 | information. */ | |
7c775aca EB |
1299 | if (TYPE_IMPL_PACKED_ARRAY_P (type) |
1300 | && TYPE_ORIGINAL_PACKED_ARRAY (type) | |
1301 | && gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) | |
1302 | TYPE_NAME (record) = TYPE_NAME (TYPE_ORIGINAL_PACKED_ARRAY (type)); | |
2d595887 | 1303 | else if (Present (gnat_entity)) |
842d4ee2 EB |
1304 | TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD"); |
1305 | ||
fe37c7af | 1306 | SET_TYPE_ALIGN (record, align ? align : orig_align); |
842d4ee2 EB |
1307 | TYPE_SIZE (record) = size ? size : orig_size; |
1308 | TYPE_SIZE_UNIT (record) | |
1309 | = convert (sizetype, | |
1310 | size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record), | |
1311 | bitsize_unit_node)); | |
1312 | ||
1313 | /* If we are changing the alignment and the input type is a record with | |
1314 | BLKmode and a small constant size, try to make a form that has an | |
1315 | integral mode. This might allow the padding record to also have an | |
1316 | integral mode, which will be much more efficient. There is no point | |
1317 | in doing so if a size is specified unless it is also a small constant | |
1318 | size and it is incorrect to do so if we cannot guarantee that the mode | |
1319 | will be naturally aligned since the field must always be addressable. | |
1320 | ||
1321 | ??? This might not always be a win when done for a stand-alone object: | |
1322 | since the nominal and the effective type of the object will now have | |
1323 | different modes, a VIEW_CONVERT_EXPR will be required for converting | |
1324 | between them and it might be hard to overcome afterwards, including | |
1325 | at the RTL level when the stand-alone object is accessed as a whole. */ | |
1326 | if (align != 0 | |
1327 | && RECORD_OR_UNION_TYPE_P (type) | |
1328 | && TYPE_MODE (type) == BLKmode | |
1329 | && !TYPE_BY_REFERENCE_P (type) | |
1330 | && TREE_CODE (orig_size) == INTEGER_CST | |
1331 | && !TREE_OVERFLOW (orig_size) | |
1332 | && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0 | |
1333 | && (!size | |
1334 | || (TREE_CODE (size) == INTEGER_CST | |
1335 | && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0))) | |
1336 | { | |
1337 | tree packable_type = make_packable_type (type, true); | |
1338 | if (TYPE_MODE (packable_type) != BLKmode | |
1339 | && align >= TYPE_ALIGN (packable_type)) | |
1340 | type = packable_type; | |
1341 | } | |
1342 | ||
1343 | /* Now create the field with the original size. */ | |
1366ba41 EB |
1344 | field = create_field_decl (get_identifier ("F"), type, record, orig_size, |
1345 | bitsize_zero_node, 0, 1); | |
842d4ee2 EB |
1346 | DECL_INTERNAL_P (field) = 1; |
1347 | ||
afc737f0 | 1348 | /* We will output additional debug info manually below. */ |
842d4ee2 EB |
1349 | finish_record_type (record, field, 1, false); |
1350 | ||
afc737f0 EB |
1351 | if (gnat_encodings == DWARF_GNAT_ENCODINGS_MINIMAL) |
1352 | SET_TYPE_DEBUG_TYPE (record, type); | |
1353 | ||
842d4ee2 EB |
1354 | /* Set the RM size if requested. */ |
1355 | if (set_rm_size) | |
1356 | { | |
5cb7516d EB |
1357 | tree canonical_pad_type; |
1358 | ||
842d4ee2 EB |
1359 | SET_TYPE_ADA_SIZE (record, size ? size : orig_size); |
1360 | ||
1361 | /* If the padded type is complete and has constant size, we canonicalize | |
1362 | it by means of the hash table. This is consistent with the language | |
1363 | semantics and ensures that gigi and the middle-end have a common view | |
1364 | of these padded types. */ | |
5cb7516d EB |
1365 | if (TREE_CONSTANT (TYPE_SIZE (record)) |
1366 | && (canonical_pad_type = lookup_and_insert_pad_type (record))) | |
842d4ee2 | 1367 | { |
5cb7516d EB |
1368 | record = canonical_pad_type; |
1369 | goto built; | |
842d4ee2 EB |
1370 | } |
1371 | } | |
1372 | ||
1373 | /* Unless debugging information isn't being written for the input type, | |
1374 | write a record that shows what we are a subtype of and also make a | |
eb59e428 PMR |
1375 | variable that indicates our size, if still variable. */ |
1376 | if (TREE_CODE (orig_size) != INTEGER_CST | |
842d4ee2 EB |
1377 | && TYPE_NAME (record) |
1378 | && TYPE_NAME (type) | |
1379 | && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
1380 | && DECL_IGNORED_P (TYPE_NAME (type)))) | |
1381 | { | |
9dba4b55 | 1382 | tree name = TYPE_IDENTIFIER (record); |
c1a569ef EB |
1383 | tree size_unit = TYPE_SIZE_UNIT (record); |
1384 | ||
1385 | /* A variable that holds the size is required even with no encoding since | |
1386 | it will be referenced by debugging information attributes. At global | |
1387 | level, we need a single variable across all translation units. */ | |
1388 | if (size | |
1389 | && TREE_CODE (size) != INTEGER_CST | |
1390 | && (definition || global_bindings_p ())) | |
1391 | { | |
eb59e428 PMR |
1392 | /* Whether or not gnat_entity comes from source, this XVZ variable is |
1393 | is a compilation artifact. */ | |
c1a569ef EB |
1394 | size_unit |
1395 | = create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype, | |
1396 | size_unit, true, global_bindings_p (), | |
1397 | !definition && global_bindings_p (), false, | |
2056c5ed | 1398 | false, true, true, NULL, gnat_entity); |
c1a569ef EB |
1399 | TYPE_SIZE_UNIT (record) = size_unit; |
1400 | } | |
1401 | ||
eb59e428 PMR |
1402 | /* There is no need to show what we are a subtype of when outputting as |
1403 | few encodings as possible: regular debugging infomation makes this | |
1404 | redundant. */ | |
1405 | if (gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) | |
1406 | { | |
1407 | tree marker = make_node (RECORD_TYPE); | |
1408 | tree orig_name = TYPE_IDENTIFIER (type); | |
1409 | ||
1410 | TYPE_NAME (marker) = concat_name (name, "XVS"); | |
1411 | finish_record_type (marker, | |
1412 | create_field_decl (orig_name, | |
1413 | build_reference_type (type), | |
1414 | marker, NULL_TREE, NULL_TREE, | |
1415 | 0, 0), | |
1416 | 0, true); | |
1417 | TYPE_SIZE_UNIT (marker) = size_unit; | |
1418 | ||
1419 | add_parallel_type (record, marker); | |
1420 | } | |
842d4ee2 EB |
1421 | } |
1422 | ||
842d4ee2 | 1423 | built: |
80746f5d | 1424 | /* If a simple size was explicitly given, maybe issue a warning. */ |
842d4ee2 EB |
1425 | if (!size |
1426 | || TREE_CODE (size) == COND_EXPR | |
1427 | || TREE_CODE (size) == MAX_EXPR | |
80746f5d | 1428 | || No (gnat_entity)) |
842d4ee2 EB |
1429 | return record; |
1430 | ||
80746f5d EB |
1431 | /* But don't do it if we are just annotating types and the type is tagged or |
1432 | concurrent, since these types aren't fully laid out in this mode. */ | |
1433 | if (type_annotate_only) | |
1434 | { | |
1435 | Entity_Id gnat_type | |
1436 | = is_component_type | |
1437 | ? Component_Type (gnat_entity) : Etype (gnat_entity); | |
1438 | ||
1439 | if (Is_Tagged_Type (gnat_type) || Is_Concurrent_Type (gnat_type)) | |
1440 | return record; | |
1441 | } | |
1442 | ||
1443 | /* Take the original size as the maximum size of the input if there was an | |
1444 | unconstrained record involved and round it up to the specified alignment, | |
1445 | if one was specified, but only for aggregate types. */ | |
842d4ee2 EB |
1446 | if (CONTAINS_PLACEHOLDER_P (orig_size)) |
1447 | orig_size = max_size (orig_size, true); | |
1448 | ||
f42dd37f | 1449 | if (align && AGGREGATE_TYPE_P (type)) |
842d4ee2 EB |
1450 | orig_size = round_up (orig_size, align); |
1451 | ||
1452 | if (!operand_equal_p (size, orig_size, 0) | |
1453 | && !(TREE_CODE (size) == INTEGER_CST | |
1454 | && TREE_CODE (orig_size) == INTEGER_CST | |
1455 | && (TREE_OVERFLOW (size) | |
1456 | || TREE_OVERFLOW (orig_size) | |
1457 | || tree_int_cst_lt (size, orig_size)))) | |
1458 | { | |
1459 | Node_Id gnat_error_node = Empty; | |
1460 | ||
1a4cb227 AC |
1461 | /* For a packed array, post the message on the original array type. */ |
1462 | if (Is_Packed_Array_Impl_Type (gnat_entity)) | |
842d4ee2 EB |
1463 | gnat_entity = Original_Array_Type (gnat_entity); |
1464 | ||
1465 | if ((Ekind (gnat_entity) == E_Component | |
1466 | || Ekind (gnat_entity) == E_Discriminant) | |
1467 | && Present (Component_Clause (gnat_entity))) | |
1468 | gnat_error_node = Last_Bit (Component_Clause (gnat_entity)); | |
1469 | else if (Present (Size_Clause (gnat_entity))) | |
1470 | gnat_error_node = Expression (Size_Clause (gnat_entity)); | |
1471 | ||
1472 | /* Generate message only for entities that come from source, since | |
1473 | if we have an entity created by expansion, the message will be | |
1474 | generated for some other corresponding source entity. */ | |
1475 | if (Comes_From_Source (gnat_entity)) | |
1476 | { | |
1477 | if (Present (gnat_error_node)) | |
1478 | post_error_ne_tree ("{^ }bits of & unused?", | |
1479 | gnat_error_node, gnat_entity, | |
1480 | size_diffop (size, orig_size)); | |
1481 | else if (is_component_type) | |
1482 | post_error_ne_tree ("component of& padded{ by ^ bits}?", | |
1483 | gnat_entity, gnat_entity, | |
1484 | size_diffop (size, orig_size)); | |
1485 | } | |
1486 | } | |
1487 | ||
1488 | return record; | |
1489 | } | |
ee45a32d EB |
1490 | |
1491 | /* Return a copy of the padded TYPE but with reverse storage order. */ | |
1492 | ||
1493 | tree | |
1494 | set_reverse_storage_order_on_pad_type (tree type) | |
1495 | { | |
1496 | tree field, canonical_pad_type; | |
1497 | ||
4232ebbb ML |
1498 | if (flag_checking) |
1499 | { | |
1500 | /* If the inner type is not scalar then the function does nothing. */ | |
1501 | tree inner_type = TREE_TYPE (TYPE_FIELDS (type)); | |
1502 | gcc_assert (!AGGREGATE_TYPE_P (inner_type) | |
1503 | && !VECTOR_TYPE_P (inner_type)); | |
1504 | } | |
ee45a32d EB |
1505 | |
1506 | /* This is required for the canonicalization. */ | |
1507 | gcc_assert (TREE_CONSTANT (TYPE_SIZE (type))); | |
1508 | ||
1509 | field = copy_node (TYPE_FIELDS (type)); | |
1510 | type = copy_type (type); | |
1511 | DECL_CONTEXT (field) = type; | |
1512 | TYPE_FIELDS (type) = field; | |
1513 | TYPE_REVERSE_STORAGE_ORDER (type) = 1; | |
1514 | canonical_pad_type = lookup_and_insert_pad_type (type); | |
1515 | return canonical_pad_type ? canonical_pad_type : type; | |
1516 | } | |
842d4ee2 EB |
1517 | \f |
1518 | /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP. | |
1519 | If this is a multi-dimensional array type, do this recursively. | |
1520 | ||
1521 | OP may be | |
1522 | - ALIAS_SET_COPY: the new set is made a copy of the old one. | |
1523 | - ALIAS_SET_SUPERSET: the new set is made a superset of the old one. | |
1524 | - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */ | |
1525 | ||
1526 | void | |
1527 | relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op) | |
1528 | { | |
1529 | /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case | |
1530 | of a one-dimensional array, since the padding has the same alias set | |
1531 | as the field type, but if it's a multi-dimensional array, we need to | |
1532 | see the inner types. */ | |
1533 | while (TREE_CODE (gnu_old_type) == RECORD_TYPE | |
1534 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type) | |
1535 | || TYPE_PADDING_P (gnu_old_type))) | |
1536 | gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type)); | |
1537 | ||
1538 | /* Unconstrained array types are deemed incomplete and would thus be given | |
1539 | alias set 0. Retrieve the underlying array type. */ | |
1540 | if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE) | |
1541 | gnu_old_type | |
1542 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type)))); | |
1543 | if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE) | |
1544 | gnu_new_type | |
1545 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type)))); | |
1546 | ||
1547 | if (TREE_CODE (gnu_new_type) == ARRAY_TYPE | |
1548 | && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE | |
1549 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type))) | |
1550 | relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op); | |
1551 | ||
1552 | switch (op) | |
1553 | { | |
1554 | case ALIAS_SET_COPY: | |
1555 | /* The alias set shouldn't be copied between array types with different | |
1556 | aliasing settings because this can break the aliasing relationship | |
1557 | between the array type and its element type. */ | |
9abe8b74 | 1558 | if (flag_checking || flag_strict_aliasing) |
842d4ee2 EB |
1559 | gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE |
1560 | && TREE_CODE (gnu_old_type) == ARRAY_TYPE | |
1561 | && TYPE_NONALIASED_COMPONENT (gnu_new_type) | |
1562 | != TYPE_NONALIASED_COMPONENT (gnu_old_type))); | |
1563 | ||
1564 | TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type); | |
1565 | break; | |
1566 | ||
1567 | case ALIAS_SET_SUBSET: | |
1568 | case ALIAS_SET_SUPERSET: | |
1569 | { | |
1570 | alias_set_type old_set = get_alias_set (gnu_old_type); | |
1571 | alias_set_type new_set = get_alias_set (gnu_new_type); | |
1572 | ||
1573 | /* Do nothing if the alias sets conflict. This ensures that we | |
1574 | never call record_alias_subset several times for the same pair | |
1575 | or at all for alias set 0. */ | |
1576 | if (!alias_sets_conflict_p (old_set, new_set)) | |
1577 | { | |
1578 | if (op == ALIAS_SET_SUBSET) | |
1579 | record_alias_subset (old_set, new_set); | |
1580 | else | |
1581 | record_alias_subset (new_set, old_set); | |
1582 | } | |
1583 | } | |
1584 | break; | |
1585 | ||
1586 | default: | |
1587 | gcc_unreachable (); | |
1588 | } | |
1589 | ||
1590 | record_component_aliases (gnu_new_type); | |
1591 | } | |
1592 | \f | |
1aeb40dd | 1593 | /* Record TYPE as a builtin type for Ada. NAME is the name of the type. |
c1a569ef | 1594 | ARTIFICIAL_P is true if the type was generated by the compiler. */ |
a1ab4c31 AC |
1595 | |
1596 | void | |
1aeb40dd | 1597 | record_builtin_type (const char *name, tree type, bool artificial_p) |
a1ab4c31 | 1598 | { |
c172df28 AH |
1599 | tree type_decl = build_decl (input_location, |
1600 | TYPE_DECL, get_identifier (name), type); | |
1aeb40dd | 1601 | DECL_ARTIFICIAL (type_decl) = artificial_p; |
bc712852 | 1602 | TYPE_ARTIFICIAL (type) = artificial_p; |
10069d53 | 1603 | gnat_pushdecl (type_decl, Empty); |
a1ab4c31 | 1604 | |
10069d53 EB |
1605 | if (debug_hooks->type_decl) |
1606 | debug_hooks->type_decl (type_decl, false); | |
a1ab4c31 AC |
1607 | } |
1608 | \f | |
825da0d2 EB |
1609 | /* Finish constructing the character type CHAR_TYPE. |
1610 | ||
1611 | In Ada character types are enumeration types and, as a consequence, are | |
1612 | represented in the front-end by integral types holding the positions of | |
1613 | the enumeration values as defined by the language, which means that the | |
1614 | integral types are unsigned. | |
1615 | ||
1616 | Unfortunately the signedness of 'char' in C is implementation-defined | |
1617 | and GCC even has the option -fsigned-char to toggle it at run time. | |
1618 | Since GNAT's philosophy is to be compatible with C by default, to wit | |
1619 | Interfaces.C.char is defined as a mere copy of Character, we may need | |
1620 | to declare character types as signed types in GENERIC and generate the | |
1621 | necessary adjustments to make them behave as unsigned types. | |
1622 | ||
1623 | The overall strategy is as follows: if 'char' is unsigned, do nothing; | |
1624 | if 'char' is signed, translate character types of CHAR_TYPE_SIZE and | |
1625 | character subtypes with RM_Size = Esize = CHAR_TYPE_SIZE into signed | |
1626 | types. The idea is to ensure that the bit pattern contained in the | |
1627 | Esize'd objects is not changed, even though the numerical value will | |
1628 | be interpreted differently depending on the signedness. | |
1629 | ||
1630 | For character types, the bounds are implicit and, therefore, need to | |
1631 | be adjusted. Morever, the debug info needs the unsigned version. */ | |
1632 | ||
1633 | void | |
1634 | finish_character_type (tree char_type) | |
1635 | { | |
1636 | if (TYPE_UNSIGNED (char_type)) | |
1637 | return; | |
1638 | ||
7005800c EB |
1639 | /* Make a copy of a generic unsigned version since we'll modify it. */ |
1640 | tree unsigned_char_type | |
1641 | = (char_type == char_type_node | |
1642 | ? unsigned_char_type_node | |
1643 | : copy_type (gnat_unsigned_type_for (char_type))); | |
825da0d2 EB |
1644 | |
1645 | TYPE_NAME (unsigned_char_type) = TYPE_NAME (char_type); | |
1646 | TYPE_STRING_FLAG (unsigned_char_type) = TYPE_STRING_FLAG (char_type); | |
1647 | TYPE_ARTIFICIAL (unsigned_char_type) = TYPE_ARTIFICIAL (char_type); | |
1648 | ||
1649 | SET_TYPE_DEBUG_TYPE (char_type, unsigned_char_type); | |
1650 | SET_TYPE_RM_MIN_VALUE (char_type, TYPE_MIN_VALUE (unsigned_char_type)); | |
1651 | SET_TYPE_RM_MAX_VALUE (char_type, TYPE_MAX_VALUE (unsigned_char_type)); | |
1652 | } | |
1653 | ||
e3edbd56 EB |
1654 | /* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST, |
1655 | finish constructing the record type as a fat pointer type. */ | |
1656 | ||
1657 | void | |
1658 | finish_fat_pointer_type (tree record_type, tree field_list) | |
1659 | { | |
1660 | /* Make sure we can put it into a register. */ | |
5da8c011 | 1661 | if (STRICT_ALIGNMENT) |
fe37c7af | 1662 | SET_TYPE_ALIGN (record_type, MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE)); |
e3edbd56 EB |
1663 | |
1664 | /* Show what it really is. */ | |
1665 | TYPE_FAT_POINTER_P (record_type) = 1; | |
1666 | ||
1667 | /* Do not emit debug info for it since the types of its fields may still be | |
1668 | incomplete at this point. */ | |
1669 | finish_record_type (record_type, field_list, 0, false); | |
1670 | ||
1671 | /* Force type_contains_placeholder_p to return true on it. Although the | |
1672 | PLACEHOLDER_EXPRs are referenced only indirectly, this isn't a pointer | |
1673 | type but the representation of the unconstrained array. */ | |
1674 | TYPE_CONTAINS_PLACEHOLDER_INTERNAL (record_type) = 2; | |
1675 | } | |
1676 | ||
032d1b71 | 1677 | /* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST, |
a1ab4c31 AC |
1678 | finish constructing the record or union type. If REP_LEVEL is zero, this |
1679 | record has no representation clause and so will be entirely laid out here. | |
1680 | If REP_LEVEL is one, this record has a representation clause and has been | |
1681 | laid out already; only set the sizes and alignment. If REP_LEVEL is two, | |
1682 | this record is derived from a parent record and thus inherits its layout; | |
032d1b71 | 1683 | only make a pass on the fields to finalize them. DEBUG_INFO_P is true if |
afc737f0 | 1684 | additional debug info needs to be output for this type. */ |
a1ab4c31 AC |
1685 | |
1686 | void | |
032d1b71 EB |
1687 | finish_record_type (tree record_type, tree field_list, int rep_level, |
1688 | bool debug_info_p) | |
a1ab4c31 AC |
1689 | { |
1690 | enum tree_code code = TREE_CODE (record_type); | |
9dba4b55 | 1691 | tree name = TYPE_IDENTIFIER (record_type); |
a1ab4c31 AC |
1692 | tree ada_size = bitsize_zero_node; |
1693 | tree size = bitsize_zero_node; | |
1694 | bool had_size = TYPE_SIZE (record_type) != 0; | |
1695 | bool had_size_unit = TYPE_SIZE_UNIT (record_type) != 0; | |
1696 | bool had_align = TYPE_ALIGN (record_type) != 0; | |
1697 | tree field; | |
1698 | ||
032d1b71 | 1699 | TYPE_FIELDS (record_type) = field_list; |
a1ab4c31 | 1700 | |
10069d53 EB |
1701 | /* Always attach the TYPE_STUB_DECL for a record type. It is required to |
1702 | generate debug info and have a parallel type. */ | |
10069d53 | 1703 | TYPE_STUB_DECL (record_type) = create_type_stub_decl (name, record_type); |
a1ab4c31 AC |
1704 | |
1705 | /* Globally initialize the record first. If this is a rep'ed record, | |
1706 | that just means some initializations; otherwise, layout the record. */ | |
1707 | if (rep_level > 0) | |
1708 | { | |
fe37c7af MM |
1709 | SET_TYPE_ALIGN (record_type, MAX (BITS_PER_UNIT, |
1710 | TYPE_ALIGN (record_type))); | |
a1ab4c31 AC |
1711 | |
1712 | if (!had_size_unit) | |
1713 | TYPE_SIZE_UNIT (record_type) = size_zero_node; | |
b1fa9126 | 1714 | |
a1ab4c31 AC |
1715 | if (!had_size) |
1716 | TYPE_SIZE (record_type) = bitsize_zero_node; | |
1717 | ||
1718 | /* For all-repped records with a size specified, lay the QUAL_UNION_TYPE | |
1719 | out just like a UNION_TYPE, since the size will be fixed. */ | |
1720 | else if (code == QUAL_UNION_TYPE) | |
1721 | code = UNION_TYPE; | |
1722 | } | |
1723 | else | |
1724 | { | |
1725 | /* Ensure there isn't a size already set. There can be in an error | |
1726 | case where there is a rep clause but all fields have errors and | |
1727 | no longer have a position. */ | |
1728 | TYPE_SIZE (record_type) = 0; | |
bb358f1c EB |
1729 | |
1730 | /* Ensure we use the traditional GCC layout for bitfields when we need | |
1731 | to pack the record type or have a representation clause. The other | |
1732 | possible layout (Microsoft C compiler), if available, would prevent | |
1733 | efficient packing in almost all cases. */ | |
1734 | #ifdef TARGET_MS_BITFIELD_LAYOUT | |
1735 | if (TARGET_MS_BITFIELD_LAYOUT && TYPE_PACKED (record_type)) | |
1736 | decl_attributes (&record_type, | |
1737 | tree_cons (get_identifier ("gcc_struct"), | |
1738 | NULL_TREE, NULL_TREE), | |
1739 | ATTR_FLAG_TYPE_IN_PLACE); | |
1740 | #endif | |
1741 | ||
a1ab4c31 AC |
1742 | layout_type (record_type); |
1743 | } | |
1744 | ||
1745 | /* At this point, the position and size of each field is known. It was | |
1746 | either set before entry by a rep clause, or by laying out the type above. | |
1747 | ||
1748 | We now run a pass over the fields (in reverse order for QUAL_UNION_TYPEs) | |
1749 | to compute the Ada size; the GCC size and alignment (for rep'ed records | |
1750 | that are not padding types); and the mode (for rep'ed records). We also | |
1751 | clear the DECL_BIT_FIELD indication for the cases we know have not been | |
1752 | handled yet, and adjust DECL_NONADDRESSABLE_P accordingly. */ | |
1753 | ||
1754 | if (code == QUAL_UNION_TYPE) | |
032d1b71 | 1755 | field_list = nreverse (field_list); |
a1ab4c31 | 1756 | |
910ad8de | 1757 | for (field = field_list; field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
1758 | { |
1759 | tree type = TREE_TYPE (field); | |
1760 | tree pos = bit_position (field); | |
1761 | tree this_size = DECL_SIZE (field); | |
1762 | tree this_ada_size; | |
1763 | ||
e1e5852c | 1764 | if (RECORD_OR_UNION_TYPE_P (type) |
315cff15 | 1765 | && !TYPE_FAT_POINTER_P (type) |
a1ab4c31 AC |
1766 | && !TYPE_CONTAINS_TEMPLATE_P (type) |
1767 | && TYPE_ADA_SIZE (type)) | |
1768 | this_ada_size = TYPE_ADA_SIZE (type); | |
1769 | else | |
1770 | this_ada_size = this_size; | |
1771 | ||
1772 | /* Clear DECL_BIT_FIELD for the cases layout_decl does not handle. */ | |
1773 | if (DECL_BIT_FIELD (field) | |
1774 | && operand_equal_p (this_size, TYPE_SIZE (type), 0)) | |
1775 | { | |
1776 | unsigned int align = TYPE_ALIGN (type); | |
1777 | ||
1778 | /* In the general case, type alignment is required. */ | |
1779 | if (value_factor_p (pos, align)) | |
1780 | { | |
1781 | /* The enclosing record type must be sufficiently aligned. | |
1782 | Otherwise, if no alignment was specified for it and it | |
1783 | has been laid out already, bump its alignment to the | |
14ecca2e EB |
1784 | desired one if this is compatible with its size and |
1785 | maximum alignment, if any. */ | |
a1ab4c31 AC |
1786 | if (TYPE_ALIGN (record_type) >= align) |
1787 | { | |
fe37c7af | 1788 | SET_DECL_ALIGN (field, MAX (DECL_ALIGN (field), align)); |
a1ab4c31 AC |
1789 | DECL_BIT_FIELD (field) = 0; |
1790 | } | |
1791 | else if (!had_align | |
1792 | && rep_level == 0 | |
14ecca2e EB |
1793 | && value_factor_p (TYPE_SIZE (record_type), align) |
1794 | && (!TYPE_MAX_ALIGN (record_type) | |
1795 | || TYPE_MAX_ALIGN (record_type) >= align)) | |
a1ab4c31 | 1796 | { |
fe37c7af MM |
1797 | SET_TYPE_ALIGN (record_type, align); |
1798 | SET_DECL_ALIGN (field, MAX (DECL_ALIGN (field), align)); | |
a1ab4c31 AC |
1799 | DECL_BIT_FIELD (field) = 0; |
1800 | } | |
1801 | } | |
1802 | ||
1803 | /* In the non-strict alignment case, only byte alignment is. */ | |
1804 | if (!STRICT_ALIGNMENT | |
1805 | && DECL_BIT_FIELD (field) | |
1806 | && value_factor_p (pos, BITS_PER_UNIT)) | |
1807 | DECL_BIT_FIELD (field) = 0; | |
1808 | } | |
1809 | ||
c1abd261 EB |
1810 | /* If we still have DECL_BIT_FIELD set at this point, we know that the |
1811 | field is technically not addressable. Except that it can actually | |
1812 | be addressed if it is BLKmode and happens to be properly aligned. */ | |
1813 | if (DECL_BIT_FIELD (field) | |
1814 | && !(DECL_MODE (field) == BLKmode | |
1815 | && value_factor_p (pos, BITS_PER_UNIT))) | |
1816 | DECL_NONADDRESSABLE_P (field) = 1; | |
a1ab4c31 AC |
1817 | |
1818 | /* A type must be as aligned as its most aligned field that is not | |
1819 | a bit-field. But this is already enforced by layout_type. */ | |
1820 | if (rep_level > 0 && !DECL_BIT_FIELD (field)) | |
fe37c7af MM |
1821 | SET_TYPE_ALIGN (record_type, |
1822 | MAX (TYPE_ALIGN (record_type), DECL_ALIGN (field))); | |
a1ab4c31 AC |
1823 | |
1824 | switch (code) | |
1825 | { | |
1826 | case UNION_TYPE: | |
1827 | ada_size = size_binop (MAX_EXPR, ada_size, this_ada_size); | |
1828 | size = size_binop (MAX_EXPR, size, this_size); | |
1829 | break; | |
1830 | ||
1831 | case QUAL_UNION_TYPE: | |
1832 | ada_size | |
1833 | = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field), | |
1834 | this_ada_size, ada_size); | |
1835 | size = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field), | |
1836 | this_size, size); | |
1837 | break; | |
1838 | ||
1839 | case RECORD_TYPE: | |
1840 | /* Since we know here that all fields are sorted in order of | |
1841 | increasing bit position, the size of the record is one | |
1842 | higher than the ending bit of the last field processed | |
1843 | unless we have a rep clause, since in that case we might | |
1844 | have a field outside a QUAL_UNION_TYPE that has a higher ending | |
1845 | position. So use a MAX in that case. Also, if this field is a | |
1846 | QUAL_UNION_TYPE, we need to take into account the previous size in | |
1847 | the case of empty variants. */ | |
1848 | ada_size | |
1849 | = merge_sizes (ada_size, pos, this_ada_size, | |
1850 | TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0); | |
1851 | size | |
1852 | = merge_sizes (size, pos, this_size, | |
1853 | TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0); | |
1854 | break; | |
1855 | ||
1856 | default: | |
1857 | gcc_unreachable (); | |
1858 | } | |
1859 | } | |
1860 | ||
1861 | if (code == QUAL_UNION_TYPE) | |
032d1b71 | 1862 | nreverse (field_list); |
a1ab4c31 AC |
1863 | |
1864 | if (rep_level < 2) | |
1865 | { | |
1866 | /* If this is a padding record, we never want to make the size smaller | |
1867 | than what was specified in it, if any. */ | |
315cff15 | 1868 | if (TYPE_IS_PADDING_P (record_type) && TYPE_SIZE (record_type)) |
a1ab4c31 AC |
1869 | size = TYPE_SIZE (record_type); |
1870 | ||
1871 | /* Now set any of the values we've just computed that apply. */ | |
315cff15 | 1872 | if (!TYPE_FAT_POINTER_P (record_type) |
a1ab4c31 AC |
1873 | && !TYPE_CONTAINS_TEMPLATE_P (record_type)) |
1874 | SET_TYPE_ADA_SIZE (record_type, ada_size); | |
1875 | ||
1876 | if (rep_level > 0) | |
1877 | { | |
1878 | tree size_unit = had_size_unit | |
1879 | ? TYPE_SIZE_UNIT (record_type) | |
1880 | : convert (sizetype, | |
1881 | size_binop (CEIL_DIV_EXPR, size, | |
1882 | bitsize_unit_node)); | |
1883 | unsigned int align = TYPE_ALIGN (record_type); | |
1884 | ||
1885 | TYPE_SIZE (record_type) = variable_size (round_up (size, align)); | |
1886 | TYPE_SIZE_UNIT (record_type) | |
1887 | = variable_size (round_up (size_unit, align / BITS_PER_UNIT)); | |
1888 | ||
1889 | compute_record_mode (record_type); | |
1890 | } | |
1891 | } | |
1892 | ||
14ecca2e EB |
1893 | /* Reset the TYPE_MAX_ALIGN field since it's private to gigi. */ |
1894 | TYPE_MAX_ALIGN (record_type) = 0; | |
1895 | ||
032d1b71 | 1896 | if (debug_info_p) |
a1ab4c31 AC |
1897 | rest_of_record_type_compilation (record_type); |
1898 | } | |
1899 | ||
24d4b3d5 AC |
1900 | /* Append PARALLEL_TYPE on the chain of parallel types of TYPE. If |
1901 | PARRALEL_TYPE has no context and its computation is not deferred yet, also | |
1902 | propagate TYPE's context to PARALLEL_TYPE's or defer its propagation to the | |
1903 | moment TYPE will get a context. */ | |
a5695aa2 EB |
1904 | |
1905 | void | |
1906 | add_parallel_type (tree type, tree parallel_type) | |
1907 | { | |
1908 | tree decl = TYPE_STUB_DECL (type); | |
1909 | ||
1910 | while (DECL_PARALLEL_TYPE (decl)) | |
1911 | decl = TYPE_STUB_DECL (DECL_PARALLEL_TYPE (decl)); | |
1912 | ||
1913 | SET_DECL_PARALLEL_TYPE (decl, parallel_type); | |
24d4b3d5 AC |
1914 | |
1915 | /* If PARALLEL_TYPE already has a context, we are done. */ | |
7c775aca | 1916 | if (TYPE_CONTEXT (parallel_type)) |
24d4b3d5 AC |
1917 | return; |
1918 | ||
7c775aca EB |
1919 | /* Otherwise, try to get one from TYPE's context. If so, simply propagate |
1920 | it to PARALLEL_TYPE. */ | |
1921 | if (TYPE_CONTEXT (type)) | |
24d4b3d5 AC |
1922 | gnat_set_type_context (parallel_type, TYPE_CONTEXT (type)); |
1923 | ||
7c775aca EB |
1924 | /* Otherwise TYPE has not context yet. We know it will have one thanks to |
1925 | gnat_pushdecl and then its context will be propagated to PARALLEL_TYPE, | |
1926 | so we have nothing to do in this case. */ | |
a5695aa2 EB |
1927 | } |
1928 | ||
1929 | /* Return true if TYPE has a parallel type. */ | |
1930 | ||
1931 | static bool | |
1932 | has_parallel_type (tree type) | |
1933 | { | |
1934 | tree decl = TYPE_STUB_DECL (type); | |
1935 | ||
1936 | return DECL_PARALLEL_TYPE (decl) != NULL_TREE; | |
1937 | } | |
1938 | ||
afc737f0 EB |
1939 | /* Wrap up compilation of RECORD_TYPE, i.e. output additional debug info |
1940 | associated with it. It need not be invoked directly in most cases as | |
1941 | finish_record_type takes care of doing so. */ | |
a1ab4c31 AC |
1942 | |
1943 | void | |
1944 | rest_of_record_type_compilation (tree record_type) | |
1945 | { | |
a1ab4c31 | 1946 | bool var_size = false; |
fb88e1dd | 1947 | tree field; |
a1ab4c31 | 1948 | |
fb88e1dd EB |
1949 | /* If this is a padded type, the bulk of the debug info has already been |
1950 | generated for the field's type. */ | |
1951 | if (TYPE_IS_PADDING_P (record_type)) | |
1952 | return; | |
1953 | ||
a5695aa2 EB |
1954 | /* If the type already has a parallel type (XVS type), then we're done. */ |
1955 | if (has_parallel_type (record_type)) | |
1956 | return; | |
1957 | ||
fb88e1dd | 1958 | for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
1959 | { |
1960 | /* We need to make an XVE/XVU record if any field has variable size, | |
1961 | whether or not the record does. For example, if we have a union, | |
1962 | it may be that all fields, rounded up to the alignment, have the | |
1963 | same size, in which case we'll use that size. But the debug | |
1964 | output routines (except Dwarf2) won't be able to output the fields, | |
1965 | so we need to make the special record. */ | |
1966 | if (TREE_CODE (DECL_SIZE (field)) != INTEGER_CST | |
1967 | /* If a field has a non-constant qualifier, the record will have | |
1968 | variable size too. */ | |
fb88e1dd | 1969 | || (TREE_CODE (record_type) == QUAL_UNION_TYPE |
a1ab4c31 AC |
1970 | && TREE_CODE (DECL_QUALIFIER (field)) != INTEGER_CST)) |
1971 | { | |
1972 | var_size = true; | |
1973 | break; | |
1974 | } | |
1975 | } | |
1976 | ||
fb88e1dd EB |
1977 | /* If this record type is of variable size, make a parallel record type that |
1978 | will tell the debugger how the former is laid out (see exp_dbug.ads). */ | |
986ccd21 | 1979 | if (var_size && gnat_encodings != DWARF_GNAT_ENCODINGS_MINIMAL) |
a1ab4c31 AC |
1980 | { |
1981 | tree new_record_type | |
1982 | = make_node (TREE_CODE (record_type) == QUAL_UNION_TYPE | |
1983 | ? UNION_TYPE : TREE_CODE (record_type)); | |
9dba4b55 | 1984 | tree orig_name = TYPE_IDENTIFIER (record_type), new_name; |
a1ab4c31 | 1985 | tree last_pos = bitsize_zero_node; |
0fb2335d | 1986 | tree old_field, prev_old_field = NULL_TREE; |
a1ab4c31 | 1987 | |
0fb2335d EB |
1988 | new_name |
1989 | = concat_name (orig_name, TREE_CODE (record_type) == QUAL_UNION_TYPE | |
1990 | ? "XVU" : "XVE"); | |
1991 | TYPE_NAME (new_record_type) = new_name; | |
fe37c7af | 1992 | SET_TYPE_ALIGN (new_record_type, BIGGEST_ALIGNMENT); |
a1ab4c31 | 1993 | TYPE_STUB_DECL (new_record_type) |
0fb2335d | 1994 | = create_type_stub_decl (new_name, new_record_type); |
a1ab4c31 AC |
1995 | DECL_IGNORED_P (TYPE_STUB_DECL (new_record_type)) |
1996 | = DECL_IGNORED_P (TYPE_STUB_DECL (record_type)); | |
396a2ee2 | 1997 | gnat_pushdecl (TYPE_STUB_DECL (new_record_type), Empty); |
a1ab4c31 AC |
1998 | TYPE_SIZE (new_record_type) = size_int (TYPE_ALIGN (record_type)); |
1999 | TYPE_SIZE_UNIT (new_record_type) | |
2000 | = size_int (TYPE_ALIGN (record_type) / BITS_PER_UNIT); | |
2001 | ||
5c475ba9 EB |
2002 | /* Now scan all the fields, replacing each field with a new field |
2003 | corresponding to the new encoding. */ | |
a1ab4c31 | 2004 | for (old_field = TYPE_FIELDS (record_type); old_field; |
910ad8de | 2005 | old_field = DECL_CHAIN (old_field)) |
a1ab4c31 AC |
2006 | { |
2007 | tree field_type = TREE_TYPE (old_field); | |
2008 | tree field_name = DECL_NAME (old_field); | |
a1ab4c31 | 2009 | tree curpos = bit_position (old_field); |
5c475ba9 | 2010 | tree pos, new_field; |
a1ab4c31 AC |
2011 | bool var = false; |
2012 | unsigned int align = 0; | |
a1ab4c31 | 2013 | |
5c475ba9 EB |
2014 | /* We're going to do some pattern matching below so remove as many |
2015 | conversions as possible. */ | |
2016 | curpos = remove_conversions (curpos, true); | |
a1ab4c31 | 2017 | |
5c475ba9 | 2018 | /* See how the position was modified from the last position. |
a1ab4c31 | 2019 | |
5c475ba9 EB |
2020 | There are two basic cases we support: a value was added |
2021 | to the last position or the last position was rounded to | |
2022 | a boundary and they something was added. Check for the | |
2023 | first case first. If not, see if there is any evidence | |
2024 | of rounding. If so, round the last position and retry. | |
a1ab4c31 | 2025 | |
5c475ba9 | 2026 | If this is a union, the position can be taken as zero. */ |
a1ab4c31 | 2027 | if (TREE_CODE (new_record_type) == UNION_TYPE) |
5c475ba9 | 2028 | pos = bitsize_zero_node; |
a1ab4c31 AC |
2029 | else |
2030 | pos = compute_related_constant (curpos, last_pos); | |
2031 | ||
5c475ba9 EB |
2032 | if (!pos |
2033 | && TREE_CODE (curpos) == MULT_EXPR | |
cc269bb6 | 2034 | && tree_fits_uhwi_p (TREE_OPERAND (curpos, 1))) |
a1ab4c31 AC |
2035 | { |
2036 | tree offset = TREE_OPERAND (curpos, 0); | |
ae7e9ddd | 2037 | align = tree_to_uhwi (TREE_OPERAND (curpos, 1)); |
5c475ba9 EB |
2038 | align = scale_by_factor_of (offset, align); |
2039 | last_pos = round_up (last_pos, align); | |
2040 | pos = compute_related_constant (curpos, last_pos); | |
a1ab4c31 | 2041 | } |
5c475ba9 EB |
2042 | else if (!pos |
2043 | && TREE_CODE (curpos) == PLUS_EXPR | |
cc269bb6 | 2044 | && tree_fits_uhwi_p (TREE_OPERAND (curpos, 1)) |
a1ab4c31 | 2045 | && TREE_CODE (TREE_OPERAND (curpos, 0)) == MULT_EXPR |
5a36c51b RS |
2046 | && tree_fits_uhwi_p |
2047 | (TREE_OPERAND (TREE_OPERAND (curpos, 0), 1))) | |
a1ab4c31 | 2048 | { |
5c475ba9 EB |
2049 | tree offset = TREE_OPERAND (TREE_OPERAND (curpos, 0), 0); |
2050 | unsigned HOST_WIDE_INT addend | |
ae7e9ddd | 2051 | = tree_to_uhwi (TREE_OPERAND (curpos, 1)); |
a1ab4c31 | 2052 | align |
ae7e9ddd | 2053 | = tree_to_uhwi (TREE_OPERAND (TREE_OPERAND (curpos, 0), 1)); |
5c475ba9 EB |
2054 | align = scale_by_factor_of (offset, align); |
2055 | align = MIN (align, addend & -addend); | |
2056 | last_pos = round_up (last_pos, align); | |
2057 | pos = compute_related_constant (curpos, last_pos); | |
a1ab4c31 | 2058 | } |
5c475ba9 | 2059 | else if (potential_alignment_gap (prev_old_field, old_field, pos)) |
a1ab4c31 AC |
2060 | { |
2061 | align = TYPE_ALIGN (field_type); | |
5c475ba9 EB |
2062 | last_pos = round_up (last_pos, align); |
2063 | pos = compute_related_constant (curpos, last_pos); | |
a1ab4c31 AC |
2064 | } |
2065 | ||
2066 | /* If we can't compute a position, set it to zero. | |
2067 | ||
5c475ba9 EB |
2068 | ??? We really should abort here, but it's too much work |
2069 | to get this correct for all cases. */ | |
a1ab4c31 AC |
2070 | if (!pos) |
2071 | pos = bitsize_zero_node; | |
2072 | ||
2073 | /* See if this type is variable-sized and make a pointer type | |
2074 | and indicate the indirection if so. Beware that the debug | |
2075 | back-end may adjust the position computed above according | |
2076 | to the alignment of the field type, i.e. the pointer type | |
2077 | in this case, if we don't preventively counter that. */ | |
2078 | if (TREE_CODE (DECL_SIZE (old_field)) != INTEGER_CST) | |
2079 | { | |
2080 | field_type = build_pointer_type (field_type); | |
2081 | if (align != 0 && TYPE_ALIGN (field_type) > align) | |
2082 | { | |
afc737f0 | 2083 | field_type = copy_type (field_type); |
fe37c7af | 2084 | SET_TYPE_ALIGN (field_type, align); |
a1ab4c31 AC |
2085 | } |
2086 | var = true; | |
2087 | } | |
2088 | ||
2089 | /* Make a new field name, if necessary. */ | |
2090 | if (var || align != 0) | |
2091 | { | |
2092 | char suffix[16]; | |
2093 | ||
2094 | if (align != 0) | |
2095 | sprintf (suffix, "XV%c%u", var ? 'L' : 'A', | |
2096 | align / BITS_PER_UNIT); | |
2097 | else | |
2098 | strcpy (suffix, "XVL"); | |
2099 | ||
0fb2335d | 2100 | field_name = concat_name (field_name, suffix); |
a1ab4c31 AC |
2101 | } |
2102 | ||
da01bfee EB |
2103 | new_field |
2104 | = create_field_decl (field_name, field_type, new_record_type, | |
2105 | DECL_SIZE (old_field), pos, 0, 0); | |
910ad8de | 2106 | DECL_CHAIN (new_field) = TYPE_FIELDS (new_record_type); |
a1ab4c31 AC |
2107 | TYPE_FIELDS (new_record_type) = new_field; |
2108 | ||
2109 | /* If old_field is a QUAL_UNION_TYPE, take its size as being | |
2110 | zero. The only time it's not the last field of the record | |
2111 | is when there are other components at fixed positions after | |
2112 | it (meaning there was a rep clause for every field) and we | |
2113 | want to be able to encode them. */ | |
2114 | last_pos = size_binop (PLUS_EXPR, bit_position (old_field), | |
2115 | (TREE_CODE (TREE_TYPE (old_field)) | |
2116 | == QUAL_UNION_TYPE) | |
2117 | ? bitsize_zero_node | |
2118 | : DECL_SIZE (old_field)); | |
2119 | prev_old_field = old_field; | |
2120 | } | |
2121 | ||
fb88e1dd | 2122 | TYPE_FIELDS (new_record_type) = nreverse (TYPE_FIELDS (new_record_type)); |
a1ab4c31 | 2123 | |
a5695aa2 | 2124 | add_parallel_type (record_type, new_record_type); |
a1ab4c31 | 2125 | } |
a1ab4c31 AC |
2126 | } |
2127 | ||
a1ab4c31 | 2128 | /* Utility function of above to merge LAST_SIZE, the previous size of a record |
1e17ef87 EB |
2129 | with FIRST_BIT and SIZE that describe a field. SPECIAL is true if this |
2130 | represents a QUAL_UNION_TYPE in which case we must look for COND_EXPRs and | |
2131 | replace a value of zero with the old size. If HAS_REP is true, we take the | |
2132 | MAX of the end position of this field with LAST_SIZE. In all other cases, | |
2133 | we use FIRST_BIT plus SIZE. Return an expression for the size. */ | |
a1ab4c31 AC |
2134 | |
2135 | static tree | |
2136 | merge_sizes (tree last_size, tree first_bit, tree size, bool special, | |
2137 | bool has_rep) | |
2138 | { | |
2139 | tree type = TREE_TYPE (last_size); | |
c6bd4220 | 2140 | tree new_size; |
a1ab4c31 AC |
2141 | |
2142 | if (!special || TREE_CODE (size) != COND_EXPR) | |
2143 | { | |
c6bd4220 | 2144 | new_size = size_binop (PLUS_EXPR, first_bit, size); |
a1ab4c31 | 2145 | if (has_rep) |
c6bd4220 | 2146 | new_size = size_binop (MAX_EXPR, last_size, new_size); |
a1ab4c31 AC |
2147 | } |
2148 | ||
2149 | else | |
c6bd4220 EB |
2150 | new_size = fold_build3 (COND_EXPR, type, TREE_OPERAND (size, 0), |
2151 | integer_zerop (TREE_OPERAND (size, 1)) | |
2152 | ? last_size : merge_sizes (last_size, first_bit, | |
2153 | TREE_OPERAND (size, 1), | |
2154 | 1, has_rep), | |
2155 | integer_zerop (TREE_OPERAND (size, 2)) | |
2156 | ? last_size : merge_sizes (last_size, first_bit, | |
2157 | TREE_OPERAND (size, 2), | |
2158 | 1, has_rep)); | |
a1ab4c31 AC |
2159 | |
2160 | /* We don't need any NON_VALUE_EXPRs and they can confuse us (especially | |
2161 | when fed through substitute_in_expr) into thinking that a constant | |
2162 | size is not constant. */ | |
c6bd4220 EB |
2163 | while (TREE_CODE (new_size) == NON_LVALUE_EXPR) |
2164 | new_size = TREE_OPERAND (new_size, 0); | |
a1ab4c31 | 2165 | |
c6bd4220 | 2166 | return new_size; |
a1ab4c31 AC |
2167 | } |
2168 | ||
2169 | /* Utility function of above to see if OP0 and OP1, both of SIZETYPE, are | |
2170 | related by the addition of a constant. Return that constant if so. */ | |
2171 | ||
2172 | static tree | |
2173 | compute_related_constant (tree op0, tree op1) | |
2174 | { | |
2175 | tree op0_var, op1_var; | |
2176 | tree op0_con = split_plus (op0, &op0_var); | |
2177 | tree op1_con = split_plus (op1, &op1_var); | |
2178 | tree result = size_binop (MINUS_EXPR, op0_con, op1_con); | |
2179 | ||
2180 | if (operand_equal_p (op0_var, op1_var, 0)) | |
2181 | return result; | |
2182 | else if (operand_equal_p (op0, size_binop (PLUS_EXPR, op1_var, result), 0)) | |
2183 | return result; | |
2184 | else | |
2185 | return 0; | |
2186 | } | |
2187 | ||
2188 | /* Utility function of above to split a tree OP which may be a sum, into a | |
2189 | constant part, which is returned, and a variable part, which is stored | |
2190 | in *PVAR. *PVAR may be bitsize_zero_node. All operations must be of | |
2191 | bitsizetype. */ | |
2192 | ||
2193 | static tree | |
2194 | split_plus (tree in, tree *pvar) | |
2195 | { | |
722356ce EB |
2196 | /* Strip conversions in order to ease the tree traversal and maximize the |
2197 | potential for constant or plus/minus discovery. We need to be careful | |
a1ab4c31 AC |
2198 | to always return and set *pvar to bitsizetype trees, but it's worth |
2199 | the effort. */ | |
722356ce | 2200 | in = remove_conversions (in, false); |
a1ab4c31 AC |
2201 | |
2202 | *pvar = convert (bitsizetype, in); | |
2203 | ||
2204 | if (TREE_CODE (in) == INTEGER_CST) | |
2205 | { | |
2206 | *pvar = bitsize_zero_node; | |
2207 | return convert (bitsizetype, in); | |
2208 | } | |
2209 | else if (TREE_CODE (in) == PLUS_EXPR || TREE_CODE (in) == MINUS_EXPR) | |
2210 | { | |
2211 | tree lhs_var, rhs_var; | |
2212 | tree lhs_con = split_plus (TREE_OPERAND (in, 0), &lhs_var); | |
2213 | tree rhs_con = split_plus (TREE_OPERAND (in, 1), &rhs_var); | |
2214 | ||
2215 | if (lhs_var == TREE_OPERAND (in, 0) | |
2216 | && rhs_var == TREE_OPERAND (in, 1)) | |
2217 | return bitsize_zero_node; | |
2218 | ||
2219 | *pvar = size_binop (TREE_CODE (in), lhs_var, rhs_var); | |
2220 | return size_binop (TREE_CODE (in), lhs_con, rhs_con); | |
2221 | } | |
2222 | else | |
2223 | return bitsize_zero_node; | |
2224 | } | |
2225 | \f | |
a1ab4c31 AC |
2226 | /* Return a copy of TYPE but safe to modify in any way. */ |
2227 | ||
2228 | tree | |
2229 | copy_type (tree type) | |
2230 | { | |
c6bd4220 | 2231 | tree new_type = copy_node (type); |
a1ab4c31 | 2232 | |
90dcfecb EB |
2233 | /* Unshare the language-specific data. */ |
2234 | if (TYPE_LANG_SPECIFIC (type)) | |
2235 | { | |
2236 | TYPE_LANG_SPECIFIC (new_type) = NULL; | |
2237 | SET_TYPE_LANG_SPECIFIC (new_type, GET_TYPE_LANG_SPECIFIC (type)); | |
2238 | } | |
2239 | ||
2240 | /* And the contents of the language-specific slot if needed. */ | |
2241 | if ((INTEGRAL_TYPE_P (type) || TREE_CODE (type) == REAL_TYPE) | |
2242 | && TYPE_RM_VALUES (type)) | |
2243 | { | |
2244 | TYPE_RM_VALUES (new_type) = NULL_TREE; | |
2245 | SET_TYPE_RM_SIZE (new_type, TYPE_RM_SIZE (type)); | |
2246 | SET_TYPE_RM_MIN_VALUE (new_type, TYPE_RM_MIN_VALUE (type)); | |
2247 | SET_TYPE_RM_MAX_VALUE (new_type, TYPE_RM_MAX_VALUE (type)); | |
2248 | } | |
2249 | ||
a1ab4c31 AC |
2250 | /* copy_node clears this field instead of copying it, because it is |
2251 | aliased with TREE_CHAIN. */ | |
c6bd4220 | 2252 | TYPE_STUB_DECL (new_type) = TYPE_STUB_DECL (type); |
a1ab4c31 | 2253 | |
afc737f0 EB |
2254 | TYPE_POINTER_TO (new_type) = NULL_TREE; |
2255 | TYPE_REFERENCE_TO (new_type) = NULL_TREE; | |
c6bd4220 | 2256 | TYPE_MAIN_VARIANT (new_type) = new_type; |
afc737f0 | 2257 | TYPE_NEXT_VARIANT (new_type) = NULL_TREE; |
4b7bd260 | 2258 | TYPE_CANONICAL (new_type) = new_type; |
a1ab4c31 | 2259 | |
c6bd4220 | 2260 | return new_type; |
a1ab4c31 AC |
2261 | } |
2262 | \f | |
c1abd261 EB |
2263 | /* Return a subtype of sizetype with range MIN to MAX and whose |
2264 | TYPE_INDEX_TYPE is INDEX. GNAT_NODE is used for the position | |
2265 | of the associated TYPE_DECL. */ | |
a1ab4c31 AC |
2266 | |
2267 | tree | |
2268 | create_index_type (tree min, tree max, tree index, Node_Id gnat_node) | |
2269 | { | |
2270 | /* First build a type for the desired range. */ | |
523e82a7 | 2271 | tree type = build_nonshared_range_type (sizetype, min, max); |
a1ab4c31 | 2272 | |
523e82a7 | 2273 | /* Then set the index type. */ |
a1ab4c31 | 2274 | SET_TYPE_INDEX_TYPE (type, index); |
74746d49 | 2275 | create_type_decl (NULL_TREE, type, true, false, gnat_node); |
c1abd261 | 2276 | |
a1ab4c31 AC |
2277 | return type; |
2278 | } | |
84fb43a1 EB |
2279 | |
2280 | /* Return a subtype of TYPE with range MIN to MAX. If TYPE is NULL, | |
2281 | sizetype is used. */ | |
2282 | ||
2283 | tree | |
2284 | create_range_type (tree type, tree min, tree max) | |
2285 | { | |
2286 | tree range_type; | |
2287 | ||
7c775aca | 2288 | if (!type) |
84fb43a1 EB |
2289 | type = sizetype; |
2290 | ||
2291 | /* First build a type with the base range. */ | |
523e82a7 EB |
2292 | range_type = build_nonshared_range_type (type, TYPE_MIN_VALUE (type), |
2293 | TYPE_MAX_VALUE (type)); | |
84fb43a1 EB |
2294 | |
2295 | /* Then set the actual range. */ | |
1eb58520 AC |
2296 | SET_TYPE_RM_MIN_VALUE (range_type, min); |
2297 | SET_TYPE_RM_MAX_VALUE (range_type, max); | |
84fb43a1 EB |
2298 | |
2299 | return range_type; | |
2300 | } | |
a1ab4c31 | 2301 | \f |
6249559b EB |
2302 | /* Return a TYPE_DECL node suitable for the TYPE_STUB_DECL field of TYPE. |
2303 | NAME gives the name of the type to be used in the declaration. */ | |
10069d53 EB |
2304 | |
2305 | tree | |
6249559b | 2306 | create_type_stub_decl (tree name, tree type) |
10069d53 | 2307 | { |
6249559b | 2308 | tree type_decl = build_decl (input_location, TYPE_DECL, name, type); |
10069d53 | 2309 | DECL_ARTIFICIAL (type_decl) = 1; |
bc712852 | 2310 | TYPE_ARTIFICIAL (type) = 1; |
10069d53 EB |
2311 | return type_decl; |
2312 | } | |
2313 | ||
6249559b EB |
2314 | /* Return a TYPE_DECL node for TYPE. NAME gives the name of the type to be |
2315 | used in the declaration. ARTIFICIAL_P is true if the declaration was | |
2316 | generated by the compiler. DEBUG_INFO_P is true if we need to write | |
2317 | debug information about this type. GNAT_NODE is used for the position | |
2318 | of the decl. */ | |
a1ab4c31 AC |
2319 | |
2320 | tree | |
6249559b EB |
2321 | create_type_decl (tree name, tree type, bool artificial_p, bool debug_info_p, |
2322 | Node_Id gnat_node) | |
a1ab4c31 | 2323 | { |
a1ab4c31 | 2324 | enum tree_code code = TREE_CODE (type); |
6249559b EB |
2325 | bool is_named |
2326 | = TYPE_NAME (type) && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL; | |
10069d53 | 2327 | tree type_decl; |
a1ab4c31 | 2328 | |
10069d53 EB |
2329 | /* Only the builtin TYPE_STUB_DECL should be used for dummy types. */ |
2330 | gcc_assert (!TYPE_IS_DUMMY_P (type)); | |
a1ab4c31 | 2331 | |
10069d53 EB |
2332 | /* If the type hasn't been named yet, we're naming it; preserve an existing |
2333 | TYPE_STUB_DECL that has been attached to it for some purpose. */ | |
6249559b | 2334 | if (!is_named && TYPE_STUB_DECL (type)) |
10069d53 EB |
2335 | { |
2336 | type_decl = TYPE_STUB_DECL (type); | |
6249559b | 2337 | DECL_NAME (type_decl) = name; |
10069d53 EB |
2338 | } |
2339 | else | |
6249559b | 2340 | type_decl = build_decl (input_location, TYPE_DECL, name, type); |
a1ab4c31 | 2341 | |
10069d53 | 2342 | DECL_ARTIFICIAL (type_decl) = artificial_p; |
bc712852 | 2343 | TYPE_ARTIFICIAL (type) = artificial_p; |
58c8f770 EB |
2344 | |
2345 | /* Add this decl to the current binding level. */ | |
10069d53 | 2346 | gnat_pushdecl (type_decl, gnat_node); |
58c8f770 | 2347 | |
aef308d0 PMR |
2348 | /* If we're naming the type, equate the TYPE_STUB_DECL to the name. This |
2349 | causes the name to be also viewed as a "tag" by the debug back-end, with | |
2350 | the advantage that no DW_TAG_typedef is emitted for artificial "tagged" | |
2351 | types in DWARF. | |
2352 | ||
2353 | Note that if "type" is used as a DECL_ORIGINAL_TYPE, it may be referenced | |
2354 | from multiple contexts, and "type_decl" references a copy of it: in such a | |
2355 | case, do not mess TYPE_STUB_DECL: we do not want to re-use the TYPE_DECL | |
2356 | with the mechanism above. */ | |
6249559b | 2357 | if (!is_named && type != DECL_ORIGINAL_TYPE (type_decl)) |
10069d53 EB |
2358 | TYPE_STUB_DECL (type) = type_decl; |
2359 | ||
50741117 EB |
2360 | /* Do not generate debug info for UNCONSTRAINED_ARRAY_TYPE that the |
2361 | back-end doesn't support, and for others if we don't need to. */ | |
a1ab4c31 AC |
2362 | if (code == UNCONSTRAINED_ARRAY_TYPE || !debug_info_p) |
2363 | DECL_IGNORED_P (type_decl) = 1; | |
a1ab4c31 AC |
2364 | |
2365 | return type_decl; | |
2366 | } | |
10069d53 | 2367 | \f |
a1ab4c31 AC |
2368 | /* Return a VAR_DECL or CONST_DECL node. |
2369 | ||
6249559b EB |
2370 | NAME gives the name of the variable. ASM_NAME is its assembler name |
2371 | (if provided). TYPE is its data type (a GCC ..._TYPE node). INIT is | |
a1ab4c31 AC |
2372 | the GCC tree for an optional initial expression; NULL_TREE if none. |
2373 | ||
2374 | CONST_FLAG is true if this variable is constant, in which case we might | |
2375 | return a CONST_DECL node unless CONST_DECL_ALLOWED_P is false. | |
2376 | ||
2377 | PUBLIC_FLAG is true if this is for a reference to a public entity or for a | |
2378 | definition to be made visible outside of the current compilation unit, for | |
2379 | instance variable definitions in a package specification. | |
2380 | ||
1e17ef87 | 2381 | EXTERN_FLAG is true when processing an external variable declaration (as |
a1ab4c31 AC |
2382 | opposed to a definition: no storage is to be allocated for the variable). |
2383 | ||
2056c5ed EB |
2384 | STATIC_FLAG is only relevant when not at top level and indicates whether |
2385 | to always allocate storage to the variable. | |
2386 | ||
2387 | VOLATILE_FLAG is true if this variable is declared as volatile. | |
a1ab4c31 | 2388 | |
c1a569ef EB |
2389 | ARTIFICIAL_P is true if the variable was generated by the compiler. |
2390 | ||
2391 | DEBUG_INFO_P is true if we need to write debug information for it. | |
2392 | ||
2ade427a EB |
2393 | ATTR_LIST is the list of attributes to be attached to the variable. |
2394 | ||
a1ab4c31 AC |
2395 | GNAT_NODE is used for the position of the decl. */ |
2396 | ||
2397 | tree | |
6249559b EB |
2398 | create_var_decl (tree name, tree asm_name, tree type, tree init, |
2399 | bool const_flag, bool public_flag, bool extern_flag, | |
2056c5ed EB |
2400 | bool static_flag, bool volatile_flag, bool artificial_p, |
2401 | bool debug_info_p, struct attrib *attr_list, | |
2402 | Node_Id gnat_node, bool const_decl_allowed_p) | |
a1ab4c31 | 2403 | { |
5fe48b3d EB |
2404 | /* Whether the object has static storage duration, either explicitly or by |
2405 | virtue of being declared at the global level. */ | |
2406 | const bool static_storage = static_flag || global_bindings_p (); | |
2407 | ||
2408 | /* Whether the initializer is constant: for an external object or an object | |
2409 | with static storage duration, we check that the initializer is a valid | |
2410 | constant expression for initializing a static variable; otherwise, we | |
2411 | only check that it is constant. */ | |
2412 | const bool init_const | |
6249559b EB |
2413 | = (init |
2414 | && gnat_types_compatible_p (type, TREE_TYPE (init)) | |
5fe48b3d | 2415 | && (extern_flag || static_storage |
6249559b | 2416 | ? initializer_constant_valid_p (init, TREE_TYPE (init)) |
5fe48b3d | 2417 | != NULL_TREE |
6249559b | 2418 | : TREE_CONSTANT (init))); |
a1ab4c31 AC |
2419 | |
2420 | /* Whether we will make TREE_CONSTANT the DECL we produce here, in which | |
5fe48b3d | 2421 | case the initializer may be used in lieu of the DECL node (as done in |
a1ab4c31 | 2422 | Identifier_to_gnu). This is useful to prevent the need of elaboration |
5fe48b3d EB |
2423 | code when an identifier for which such a DECL is made is in turn used |
2424 | as an initializer. We used to rely on CONST_DECL vs VAR_DECL for this, | |
2425 | but extra constraints apply to this choice (see below) and they are not | |
2426 | relevant to the distinction we wish to make. */ | |
2427 | const bool constant_p = const_flag && init_const; | |
a1ab4c31 AC |
2428 | |
2429 | /* The actual DECL node. CONST_DECL was initially intended for enumerals | |
2430 | and may be used for scalars in general but not for aggregates. */ | |
2431 | tree var_decl | |
c172df28 AH |
2432 | = build_decl (input_location, |
2433 | (constant_p && const_decl_allowed_p | |
a1ab4c31 | 2434 | && !AGGREGATE_TYPE_P (type)) ? CONST_DECL : VAR_DECL, |
6249559b | 2435 | name, type); |
a1ab4c31 | 2436 | |
93e708f9 EB |
2437 | /* Detect constants created by the front-end to hold 'reference to function |
2438 | calls for stabilization purposes. This is needed for renaming. */ | |
2439 | if (const_flag && init && POINTER_TYPE_P (type)) | |
2440 | { | |
2441 | tree inner = init; | |
2442 | if (TREE_CODE (inner) == COMPOUND_EXPR) | |
2443 | inner = TREE_OPERAND (inner, 1); | |
2444 | inner = remove_conversions (inner, true); | |
2445 | if (TREE_CODE (inner) == ADDR_EXPR | |
2446 | && ((TREE_CODE (TREE_OPERAND (inner, 0)) == CALL_EXPR | |
2447 | && !call_is_atomic_load (TREE_OPERAND (inner, 0))) | |
2448 | || (TREE_CODE (TREE_OPERAND (inner, 0)) == VAR_DECL | |
2449 | && DECL_RETURN_VALUE_P (TREE_OPERAND (inner, 0))))) | |
2450 | DECL_RETURN_VALUE_P (var_decl) = 1; | |
2451 | } | |
2452 | ||
a1ab4c31 AC |
2453 | /* If this is external, throw away any initializations (they will be done |
2454 | elsewhere) unless this is a constant for which we would like to remain | |
2455 | able to get the initializer. If we are defining a global here, leave a | |
2456 | constant initialization and save any variable elaborations for the | |
2457 | elaboration routine. If we are just annotating types, throw away the | |
2458 | initialization if it isn't a constant. */ | |
2459 | if ((extern_flag && !constant_p) | |
6249559b EB |
2460 | || (type_annotate_only && init && !TREE_CONSTANT (init))) |
2461 | init = NULL_TREE; | |
a1ab4c31 | 2462 | |
5fe48b3d EB |
2463 | /* At the global level, a non-constant initializer generates elaboration |
2464 | statements. Check that such statements are allowed, that is to say, | |
2465 | not violating a No_Elaboration_Code restriction. */ | |
6249559b | 2466 | if (init && !init_const && global_bindings_p ()) |
a1ab4c31 | 2467 | Check_Elaboration_Code_Allowed (gnat_node); |
3b9e8343 | 2468 | |
c1a569ef | 2469 | /* Attach the initializer, if any. */ |
6249559b | 2470 | DECL_INITIAL (var_decl) = init; |
c1a569ef EB |
2471 | |
2472 | /* Directly set some flags. */ | |
2473 | DECL_ARTIFICIAL (var_decl) = artificial_p; | |
8b7b0c36 | 2474 | DECL_EXTERNAL (var_decl) = extern_flag; |
a1ab4c31 | 2475 | |
ffe9a0a7 EB |
2476 | TREE_CONSTANT (var_decl) = constant_p; |
2477 | TREE_READONLY (var_decl) = const_flag; | |
2478 | ||
2479 | /* The object is public if it is external or if it is declared public | |
2480 | and has static storage duration. */ | |
2481 | TREE_PUBLIC (var_decl) = extern_flag || (public_flag && static_storage); | |
2482 | ||
2483 | /* We need to allocate static storage for an object with static storage | |
2484 | duration if it isn't external. */ | |
2485 | TREE_STATIC (var_decl) = !extern_flag && static_storage; | |
2486 | ||
2487 | TREE_SIDE_EFFECTS (var_decl) | |
2488 | = TREE_THIS_VOLATILE (var_decl) | |
2489 | = TYPE_VOLATILE (type) | volatile_flag; | |
2490 | ||
2491 | if (TREE_SIDE_EFFECTS (var_decl)) | |
2492 | TREE_ADDRESSABLE (var_decl) = 1; | |
2493 | ||
a1ab4c31 AC |
2494 | /* Ada doesn't feature Fortran-like COMMON variables so we shouldn't |
2495 | try to fiddle with DECL_COMMON. However, on platforms that don't | |
2496 | support global BSS sections, uninitialized global variables would | |
2497 | go in DATA instead, thus increasing the size of the executable. */ | |
2498 | if (!flag_no_common | |
2499 | && TREE_CODE (var_decl) == VAR_DECL | |
3b9e8343 | 2500 | && TREE_PUBLIC (var_decl) |
a1ab4c31 AC |
2501 | && !have_global_bss_p ()) |
2502 | DECL_COMMON (var_decl) = 1; | |
a1ab4c31 | 2503 | |
c1a569ef EB |
2504 | /* Do not emit debug info for a CONST_DECL if optimization isn't enabled, |
2505 | since we will create an associated variable. Likewise for an external | |
2506 | constant whose initializer is not absolute, because this would mean a | |
2507 | global relocation in a read-only section which runs afoul of the PE-COFF | |
2508 | run-time relocation mechanism. */ | |
2509 | if (!debug_info_p | |
2510 | || (TREE_CODE (var_decl) == CONST_DECL && !optimize) | |
2511 | || (extern_flag | |
2512 | && constant_p | |
6249559b EB |
2513 | && init |
2514 | && initializer_constant_valid_p (init, TREE_TYPE (init)) | |
c1a569ef | 2515 | != null_pointer_node)) |
5225a138 EB |
2516 | DECL_IGNORED_P (var_decl) = 1; |
2517 | ||
74746d49 EB |
2518 | /* ??? Some attributes cannot be applied to CONST_DECLs. */ |
2519 | if (TREE_CODE (var_decl) == VAR_DECL) | |
2520 | process_attributes (&var_decl, &attr_list, true, gnat_node); | |
2521 | ||
2522 | /* Add this decl to the current binding level. */ | |
2523 | gnat_pushdecl (var_decl, gnat_node); | |
2524 | ||
a22b794d | 2525 | if (TREE_CODE (var_decl) == VAR_DECL && asm_name) |
a1ab4c31 | 2526 | { |
a22b794d EB |
2527 | /* Let the target mangle the name if this isn't a verbatim asm. */ |
2528 | if (*IDENTIFIER_POINTER (asm_name) != '*') | |
2529 | asm_name = targetm.mangle_decl_assembler_name (var_decl, asm_name); | |
74746d49 | 2530 | |
a22b794d | 2531 | SET_DECL_ASSEMBLER_NAME (var_decl, asm_name); |
a1ab4c31 | 2532 | } |
a1ab4c31 AC |
2533 | |
2534 | return var_decl; | |
2535 | } | |
2536 | \f | |
2537 | /* Return true if TYPE, an aggregate type, contains (or is) an array. */ | |
2538 | ||
2539 | static bool | |
2540 | aggregate_type_contains_array_p (tree type) | |
2541 | { | |
2542 | switch (TREE_CODE (type)) | |
2543 | { | |
2544 | case RECORD_TYPE: | |
2545 | case UNION_TYPE: | |
2546 | case QUAL_UNION_TYPE: | |
2547 | { | |
2548 | tree field; | |
910ad8de | 2549 | for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
2550 | if (AGGREGATE_TYPE_P (TREE_TYPE (field)) |
2551 | && aggregate_type_contains_array_p (TREE_TYPE (field))) | |
2552 | return true; | |
2553 | return false; | |
2554 | } | |
2555 | ||
2556 | case ARRAY_TYPE: | |
2557 | return true; | |
2558 | ||
2559 | default: | |
2560 | gcc_unreachable (); | |
2561 | } | |
2562 | } | |
2563 | ||
6249559b EB |
2564 | /* Return a FIELD_DECL node. NAME is the field's name, TYPE is its type and |
2565 | RECORD_TYPE is the type of the enclosing record. If SIZE is nonzero, it | |
2566 | is the specified size of the field. If POS is nonzero, it is the bit | |
2567 | position. PACKED is 1 if the enclosing record is packed, -1 if it has | |
2568 | Component_Alignment of Storage_Unit. If ADDRESSABLE is nonzero, it | |
62f9f3ce EB |
2569 | means we are allowed to take the address of the field; if it is negative, |
2570 | we should not make a bitfield, which is used by make_aligning_type. */ | |
a1ab4c31 AC |
2571 | |
2572 | tree | |
6249559b EB |
2573 | create_field_decl (tree name, tree type, tree record_type, tree size, tree pos, |
2574 | int packed, int addressable) | |
a1ab4c31 | 2575 | { |
6249559b | 2576 | tree field_decl = build_decl (input_location, FIELD_DECL, name, type); |
a1ab4c31 AC |
2577 | |
2578 | DECL_CONTEXT (field_decl) = record_type; | |
6249559b | 2579 | TREE_READONLY (field_decl) = TYPE_READONLY (type); |
a1ab4c31 AC |
2580 | |
2581 | /* If FIELD_TYPE is BLKmode, we must ensure this is aligned to at least a | |
2582 | byte boundary since GCC cannot handle less-aligned BLKmode bitfields. | |
2583 | Likewise for an aggregate without specified position that contains an | |
2584 | array, because in this case slices of variable length of this array | |
2585 | must be handled by GCC and variable-sized objects need to be aligned | |
2586 | to at least a byte boundary. */ | |
6249559b | 2587 | if (packed && (TYPE_MODE (type) == BLKmode |
a1ab4c31 | 2588 | || (!pos |
6249559b EB |
2589 | && AGGREGATE_TYPE_P (type) |
2590 | && aggregate_type_contains_array_p (type)))) | |
fe37c7af | 2591 | SET_DECL_ALIGN (field_decl, BITS_PER_UNIT); |
a1ab4c31 AC |
2592 | |
2593 | /* If a size is specified, use it. Otherwise, if the record type is packed | |
2594 | compute a size to use, which may differ from the object's natural size. | |
2595 | We always set a size in this case to trigger the checks for bitfield | |
2596 | creation below, which is typically required when no position has been | |
2597 | specified. */ | |
2598 | if (size) | |
2599 | size = convert (bitsizetype, size); | |
2600 | else if (packed == 1) | |
2601 | { | |
6249559b EB |
2602 | size = rm_size (type); |
2603 | if (TYPE_MODE (type) == BLKmode) | |
62f9f3ce | 2604 | size = round_up (size, BITS_PER_UNIT); |
a1ab4c31 AC |
2605 | } |
2606 | ||
2607 | /* If we may, according to ADDRESSABLE, make a bitfield if a size is | |
2608 | specified for two reasons: first if the size differs from the natural | |
2609 | size. Second, if the alignment is insufficient. There are a number of | |
2610 | ways the latter can be true. | |
2611 | ||
2612 | We never make a bitfield if the type of the field has a nonconstant size, | |
2613 | because no such entity requiring bitfield operations should reach here. | |
2614 | ||
2615 | We do *preventively* make a bitfield when there might be the need for it | |
2616 | but we don't have all the necessary information to decide, as is the case | |
2617 | of a field with no specified position in a packed record. | |
2618 | ||
2619 | We also don't look at STRICT_ALIGNMENT here, and rely on later processing | |
2620 | in layout_decl or finish_record_type to clear the bit_field indication if | |
2621 | it is in fact not needed. */ | |
2622 | if (addressable >= 0 | |
2623 | && size | |
2624 | && TREE_CODE (size) == INTEGER_CST | |
6249559b EB |
2625 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST |
2626 | && (!tree_int_cst_equal (size, TYPE_SIZE (type)) | |
2627 | || (pos && !value_factor_p (pos, TYPE_ALIGN (type))) | |
a1ab4c31 AC |
2628 | || packed |
2629 | || (TYPE_ALIGN (record_type) != 0 | |
6249559b | 2630 | && TYPE_ALIGN (record_type) < TYPE_ALIGN (type)))) |
a1ab4c31 AC |
2631 | { |
2632 | DECL_BIT_FIELD (field_decl) = 1; | |
2633 | DECL_SIZE (field_decl) = size; | |
2634 | if (!packed && !pos) | |
feec4372 EB |
2635 | { |
2636 | if (TYPE_ALIGN (record_type) != 0 | |
6249559b | 2637 | && TYPE_ALIGN (record_type) < TYPE_ALIGN (type)) |
fe37c7af | 2638 | SET_DECL_ALIGN (field_decl, TYPE_ALIGN (record_type)); |
feec4372 | 2639 | else |
fe37c7af | 2640 | SET_DECL_ALIGN (field_decl, TYPE_ALIGN (type)); |
feec4372 | 2641 | } |
a1ab4c31 AC |
2642 | } |
2643 | ||
2644 | DECL_PACKED (field_decl) = pos ? DECL_BIT_FIELD (field_decl) : packed; | |
2645 | ||
2646 | /* Bump the alignment if need be, either for bitfield/packing purposes or | |
2647 | to satisfy the type requirements if no such consideration applies. When | |
2648 | we get the alignment from the type, indicate if this is from an explicit | |
2649 | user request, which prevents stor-layout from lowering it later on. */ | |
2650 | { | |
d9223014 | 2651 | unsigned int bit_align |
a1ab4c31 | 2652 | = (DECL_BIT_FIELD (field_decl) ? 1 |
6249559b | 2653 | : packed && TYPE_MODE (type) != BLKmode ? BITS_PER_UNIT : 0); |
a1ab4c31 AC |
2654 | |
2655 | if (bit_align > DECL_ALIGN (field_decl)) | |
fe37c7af | 2656 | SET_DECL_ALIGN (field_decl, bit_align); |
6249559b | 2657 | else if (!bit_align && TYPE_ALIGN (type) > DECL_ALIGN (field_decl)) |
a1ab4c31 | 2658 | { |
fe37c7af | 2659 | SET_DECL_ALIGN (field_decl, TYPE_ALIGN (type)); |
6249559b | 2660 | DECL_USER_ALIGN (field_decl) = TYPE_USER_ALIGN (type); |
a1ab4c31 AC |
2661 | } |
2662 | } | |
2663 | ||
2664 | if (pos) | |
2665 | { | |
2666 | /* We need to pass in the alignment the DECL is known to have. | |
2667 | This is the lowest-order bit set in POS, but no more than | |
2668 | the alignment of the record, if one is specified. Note | |
2669 | that an alignment of 0 is taken as infinite. */ | |
2670 | unsigned int known_align; | |
2671 | ||
cc269bb6 | 2672 | if (tree_fits_uhwi_p (pos)) |
ae7e9ddd | 2673 | known_align = tree_to_uhwi (pos) & - tree_to_uhwi (pos); |
a1ab4c31 AC |
2674 | else |
2675 | known_align = BITS_PER_UNIT; | |
2676 | ||
2677 | if (TYPE_ALIGN (record_type) | |
2678 | && (known_align == 0 || known_align > TYPE_ALIGN (record_type))) | |
2679 | known_align = TYPE_ALIGN (record_type); | |
2680 | ||
2681 | layout_decl (field_decl, known_align); | |
2682 | SET_DECL_OFFSET_ALIGN (field_decl, | |
cc269bb6 | 2683 | tree_fits_uhwi_p (pos) ? BIGGEST_ALIGNMENT |
a1ab4c31 AC |
2684 | : BITS_PER_UNIT); |
2685 | pos_from_bit (&DECL_FIELD_OFFSET (field_decl), | |
2686 | &DECL_FIELD_BIT_OFFSET (field_decl), | |
2687 | DECL_OFFSET_ALIGN (field_decl), pos); | |
a1ab4c31 AC |
2688 | } |
2689 | ||
2690 | /* In addition to what our caller says, claim the field is addressable if we | |
2691 | know that its type is not suitable. | |
2692 | ||
2693 | The field may also be "technically" nonaddressable, meaning that even if | |
2694 | we attempt to take the field's address we will actually get the address | |
2695 | of a copy. This is the case for true bitfields, but the DECL_BIT_FIELD | |
2696 | value we have at this point is not accurate enough, so we don't account | |
2697 | for this here and let finish_record_type decide. */ | |
6249559b | 2698 | if (!addressable && !type_for_nonaliased_component_p (type)) |
a1ab4c31 AC |
2699 | addressable = 1; |
2700 | ||
2701 | DECL_NONADDRESSABLE_P (field_decl) = !addressable; | |
2702 | ||
2703 | return field_decl; | |
2704 | } | |
2705 | \f | |
1e55d29a | 2706 | /* Return a PARM_DECL node with NAME and TYPE. */ |
a1ab4c31 AC |
2707 | |
2708 | tree | |
1e55d29a | 2709 | create_param_decl (tree name, tree type) |
a1ab4c31 | 2710 | { |
6249559b | 2711 | tree param_decl = build_decl (input_location, PARM_DECL, name, type); |
a1ab4c31 | 2712 | |
a8e05f92 EB |
2713 | /* Honor TARGET_PROMOTE_PROTOTYPES like the C compiler, as not doing so |
2714 | can lead to various ABI violations. */ | |
2715 | if (targetm.calls.promote_prototypes (NULL_TREE) | |
6249559b EB |
2716 | && INTEGRAL_TYPE_P (type) |
2717 | && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node)) | |
a1ab4c31 AC |
2718 | { |
2719 | /* We have to be careful about biased types here. Make a subtype | |
2720 | of integer_type_node with the proper biasing. */ | |
6249559b EB |
2721 | if (TREE_CODE (type) == INTEGER_TYPE |
2722 | && TYPE_BIASED_REPRESENTATION_P (type)) | |
a1ab4c31 | 2723 | { |
84fb43a1 EB |
2724 | tree subtype |
2725 | = make_unsigned_type (TYPE_PRECISION (integer_type_node)); | |
c1abd261 EB |
2726 | TREE_TYPE (subtype) = integer_type_node; |
2727 | TYPE_BIASED_REPRESENTATION_P (subtype) = 1; | |
6249559b EB |
2728 | SET_TYPE_RM_MIN_VALUE (subtype, TYPE_MIN_VALUE (type)); |
2729 | SET_TYPE_RM_MAX_VALUE (subtype, TYPE_MAX_VALUE (type)); | |
2730 | type = subtype; | |
a1ab4c31 AC |
2731 | } |
2732 | else | |
6249559b | 2733 | type = integer_type_node; |
a1ab4c31 AC |
2734 | } |
2735 | ||
6249559b | 2736 | DECL_ARG_TYPE (param_decl) = type; |
a1ab4c31 AC |
2737 | return param_decl; |
2738 | } | |
2739 | \f | |
74746d49 EB |
2740 | /* Process the attributes in ATTR_LIST for NODE, which is either a DECL or |
2741 | a TYPE. If IN_PLACE is true, the tree pointed to by NODE should not be | |
2742 | changed. GNAT_NODE is used for the position of error messages. */ | |
a1ab4c31 | 2743 | |
74746d49 EB |
2744 | void |
2745 | process_attributes (tree *node, struct attrib **attr_list, bool in_place, | |
2746 | Node_Id gnat_node) | |
a1ab4c31 | 2747 | { |
74746d49 EB |
2748 | struct attrib *attr; |
2749 | ||
2750 | for (attr = *attr_list; attr; attr = attr->next) | |
2751 | switch (attr->type) | |
a1ab4c31 AC |
2752 | { |
2753 | case ATTR_MACHINE_ATTRIBUTE: | |
74746d49 EB |
2754 | Sloc_to_locus (Sloc (gnat_node), &input_location); |
2755 | decl_attributes (node, tree_cons (attr->name, attr->args, NULL_TREE), | |
2756 | in_place ? ATTR_FLAG_TYPE_IN_PLACE : 0); | |
a1ab4c31 AC |
2757 | break; |
2758 | ||
2759 | case ATTR_LINK_ALIAS: | |
74746d49 | 2760 | if (!DECL_EXTERNAL (*node)) |
a1ab4c31 | 2761 | { |
74746d49 EB |
2762 | TREE_STATIC (*node) = 1; |
2763 | assemble_alias (*node, attr->name); | |
a1ab4c31 AC |
2764 | } |
2765 | break; | |
2766 | ||
2767 | case ATTR_WEAK_EXTERNAL: | |
2768 | if (SUPPORTS_WEAK) | |
74746d49 | 2769 | declare_weak (*node); |
a1ab4c31 AC |
2770 | else |
2771 | post_error ("?weak declarations not supported on this target", | |
74746d49 | 2772 | attr->error_point); |
a1ab4c31 AC |
2773 | break; |
2774 | ||
2775 | case ATTR_LINK_SECTION: | |
677f3fa8 | 2776 | if (targetm_common.have_named_sections) |
a1ab4c31 | 2777 | { |
0ab75824 | 2778 | set_decl_section_name (*node, IDENTIFIER_POINTER (attr->name)); |
74746d49 | 2779 | DECL_COMMON (*node) = 0; |
a1ab4c31 AC |
2780 | } |
2781 | else | |
2782 | post_error ("?section attributes are not supported for this target", | |
74746d49 | 2783 | attr->error_point); |
a1ab4c31 AC |
2784 | break; |
2785 | ||
2786 | case ATTR_LINK_CONSTRUCTOR: | |
74746d49 EB |
2787 | DECL_STATIC_CONSTRUCTOR (*node) = 1; |
2788 | TREE_USED (*node) = 1; | |
a1ab4c31 AC |
2789 | break; |
2790 | ||
2791 | case ATTR_LINK_DESTRUCTOR: | |
74746d49 EB |
2792 | DECL_STATIC_DESTRUCTOR (*node) = 1; |
2793 | TREE_USED (*node) = 1; | |
a1ab4c31 | 2794 | break; |
40a14772 TG |
2795 | |
2796 | case ATTR_THREAD_LOCAL_STORAGE: | |
56363ffd | 2797 | set_decl_tls_model (*node, decl_default_tls_model (*node)); |
74746d49 | 2798 | DECL_COMMON (*node) = 0; |
40a14772 | 2799 | break; |
a1ab4c31 | 2800 | } |
74746d49 EB |
2801 | |
2802 | *attr_list = NULL; | |
a1ab4c31 | 2803 | } |
a1ab4c31 AC |
2804 | |
2805 | /* Return true if VALUE is a known to be a multiple of FACTOR, which must be | |
2806 | a power of 2. */ | |
2807 | ||
2808 | bool | |
2809 | value_factor_p (tree value, HOST_WIDE_INT factor) | |
2810 | { | |
cc269bb6 | 2811 | if (tree_fits_uhwi_p (value)) |
ae7e9ddd | 2812 | return tree_to_uhwi (value) % factor == 0; |
a1ab4c31 AC |
2813 | |
2814 | if (TREE_CODE (value) == MULT_EXPR) | |
2815 | return (value_factor_p (TREE_OPERAND (value, 0), factor) | |
2816 | || value_factor_p (TREE_OPERAND (value, 1), factor)); | |
2817 | ||
2818 | return false; | |
2819 | } | |
2820 | ||
e8fa3dcd PMR |
2821 | /* Return whether GNAT_NODE is a defining identifier for a renaming that comes |
2822 | from the parameter association for the instantiation of a generic. We do | |
2823 | not want to emit source location for them: the code generated for their | |
2824 | initialization is likely to disturb debugging. */ | |
2825 | ||
2826 | bool | |
2827 | renaming_from_generic_instantiation_p (Node_Id gnat_node) | |
2828 | { | |
2829 | if (Nkind (gnat_node) != N_Defining_Identifier | |
2830 | || !IN (Ekind (gnat_node), Object_Kind) | |
2831 | || Comes_From_Source (gnat_node) | |
2832 | || !Present (Renamed_Object (gnat_node))) | |
2833 | return false; | |
2834 | ||
2835 | /* Get the object declaration of the renamed object, if any and if the | |
2836 | renamed object is a mere identifier. */ | |
2837 | gnat_node = Renamed_Object (gnat_node); | |
2838 | if (Nkind (gnat_node) != N_Identifier) | |
2839 | return false; | |
2840 | ||
2841 | gnat_node = Entity (gnat_node); | |
2842 | if (!Present (Parent (gnat_node))) | |
2843 | return false; | |
2844 | ||
2845 | gnat_node = Parent (gnat_node); | |
2846 | return | |
2847 | (Present (gnat_node) | |
2848 | && Nkind (gnat_node) == N_Object_Declaration | |
2849 | && Present (Corresponding_Generic_Association (gnat_node))); | |
2850 | } | |
2851 | ||
9a30c7c4 AC |
2852 | /* Defer the initialization of DECL's DECL_CONTEXT attribute, scheduling to |
2853 | feed it with the elaboration of GNAT_SCOPE. */ | |
2854 | ||
2855 | static struct deferred_decl_context_node * | |
2856 | add_deferred_decl_context (tree decl, Entity_Id gnat_scope, int force_global) | |
2857 | { | |
2858 | struct deferred_decl_context_node *new_node; | |
2859 | ||
2860 | new_node | |
2861 | = (struct deferred_decl_context_node * ) xmalloc (sizeof (*new_node)); | |
2862 | new_node->decl = decl; | |
2863 | new_node->gnat_scope = gnat_scope; | |
2864 | new_node->force_global = force_global; | |
2865 | new_node->types.create (1); | |
2866 | new_node->next = deferred_decl_context_queue; | |
2867 | deferred_decl_context_queue = new_node; | |
2868 | return new_node; | |
2869 | } | |
2870 | ||
2871 | /* Defer the initialization of TYPE's TYPE_CONTEXT attribute, scheduling to | |
2872 | feed it with the DECL_CONTEXT computed as part of N as soon as it is | |
2873 | computed. */ | |
2874 | ||
2875 | static void | |
2876 | add_deferred_type_context (struct deferred_decl_context_node *n, tree type) | |
2877 | { | |
2878 | n->types.safe_push (type); | |
2879 | } | |
2880 | ||
2881 | /* Get the GENERIC node corresponding to GNAT_SCOPE, if available. Return | |
2882 | NULL_TREE if it is not available. */ | |
2883 | ||
2884 | static tree | |
2885 | compute_deferred_decl_context (Entity_Id gnat_scope) | |
2886 | { | |
2887 | tree context; | |
2888 | ||
2889 | if (present_gnu_tree (gnat_scope)) | |
2890 | context = get_gnu_tree (gnat_scope); | |
2891 | else | |
2892 | return NULL_TREE; | |
2893 | ||
2894 | if (TREE_CODE (context) == TYPE_DECL) | |
2895 | { | |
2896 | const tree context_type = TREE_TYPE (context); | |
2897 | ||
2898 | /* Skip dummy types: only the final ones can appear in the context | |
2899 | chain. */ | |
2900 | if (TYPE_DUMMY_P (context_type)) | |
2901 | return NULL_TREE; | |
2902 | ||
2903 | /* ..._TYPE nodes are more useful than TYPE_DECL nodes in the context | |
2904 | chain. */ | |
2905 | else | |
2906 | context = context_type; | |
2907 | } | |
2908 | ||
2909 | return context; | |
2910 | } | |
2911 | ||
2912 | /* Try to process all deferred nodes in the queue. Keep in the queue the ones | |
2913 | that cannot be processed yet, remove the other ones. If FORCE is true, | |
2914 | force the processing for all nodes, use the global context when nodes don't | |
2915 | have a GNU translation. */ | |
2916 | ||
2917 | void | |
2918 | process_deferred_decl_context (bool force) | |
2919 | { | |
2920 | struct deferred_decl_context_node **it = &deferred_decl_context_queue; | |
2921 | struct deferred_decl_context_node *node; | |
2922 | ||
2923 | while (*it != NULL) | |
2924 | { | |
2925 | bool processed = false; | |
2926 | tree context = NULL_TREE; | |
2927 | Entity_Id gnat_scope; | |
2928 | ||
2929 | node = *it; | |
2930 | ||
2931 | /* If FORCE, get the innermost elaborated scope. Otherwise, just try to | |
2932 | get the first scope. */ | |
2933 | gnat_scope = node->gnat_scope; | |
2934 | while (Present (gnat_scope)) | |
2935 | { | |
2936 | context = compute_deferred_decl_context (gnat_scope); | |
7c775aca | 2937 | if (!force || context) |
9a30c7c4 AC |
2938 | break; |
2939 | gnat_scope = get_debug_scope (gnat_scope, NULL); | |
2940 | } | |
2941 | ||
2942 | /* Imported declarations must not be in a local context (i.e. not inside | |
2943 | a function). */ | |
7c775aca | 2944 | if (context && node->force_global > 0) |
9a30c7c4 AC |
2945 | { |
2946 | tree ctx = context; | |
2947 | ||
7c775aca | 2948 | while (ctx) |
9a30c7c4 AC |
2949 | { |
2950 | gcc_assert (TREE_CODE (ctx) != FUNCTION_DECL); | |
7c775aca | 2951 | ctx = DECL_P (ctx) ? DECL_CONTEXT (ctx) : TYPE_CONTEXT (ctx); |
9a30c7c4 AC |
2952 | } |
2953 | } | |
2954 | ||
2955 | /* If FORCE, we want to get rid of all nodes in the queue: in case there | |
2956 | was no elaborated scope, use the global context. */ | |
7c775aca | 2957 | if (force && !context) |
9a30c7c4 AC |
2958 | context = get_global_context (); |
2959 | ||
7c775aca | 2960 | if (context) |
9a30c7c4 AC |
2961 | { |
2962 | tree t; | |
2963 | int i; | |
2964 | ||
2965 | DECL_CONTEXT (node->decl) = context; | |
2966 | ||
2967 | /* Propagate it to the TYPE_CONTEXT attributes of the requested | |
2968 | ..._TYPE nodes. */ | |
2969 | FOR_EACH_VEC_ELT (node->types, i, t) | |
2970 | { | |
24d4b3d5 | 2971 | gnat_set_type_context (t, context); |
9a30c7c4 AC |
2972 | } |
2973 | processed = true; | |
2974 | } | |
2975 | ||
2976 | /* If this node has been successfuly processed, remove it from the | |
2977 | queue. Then move to the next node. */ | |
2978 | if (processed) | |
2979 | { | |
2980 | *it = node->next; | |
2981 | node->types.release (); | |
2982 | free (node); | |
2983 | } | |
2984 | else | |
2985 | it = &node->next; | |
2986 | } | |
2987 | } | |
2988 | ||
2989 | ||
5c475ba9 EB |
2990 | /* Return VALUE scaled by the biggest power-of-2 factor of EXPR. */ |
2991 | ||
2992 | static unsigned int | |
2993 | scale_by_factor_of (tree expr, unsigned int value) | |
2994 | { | |
3b5d86ec PMR |
2995 | unsigned HOST_WIDE_INT addend = 0; |
2996 | unsigned HOST_WIDE_INT factor = 1; | |
2997 | ||
2998 | /* Peel conversions around EXPR and try to extract bodies from function | |
2999 | calls: it is possible to get the scale factor from size functions. */ | |
5c475ba9 | 3000 | expr = remove_conversions (expr, true); |
3b5d86ec PMR |
3001 | if (TREE_CODE (expr) == CALL_EXPR) |
3002 | expr = maybe_inline_call_in_expr (expr); | |
3003 | ||
3004 | /* Sometimes we get PLUS_EXPR (BIT_AND_EXPR (..., X), Y), where Y is a | |
3005 | multiple of the scale factor we are looking for. */ | |
3006 | if (TREE_CODE (expr) == PLUS_EXPR | |
3007 | && TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST | |
3008 | && tree_fits_uhwi_p (TREE_OPERAND (expr, 1))) | |
3009 | { | |
3010 | addend = TREE_INT_CST_LOW (TREE_OPERAND (expr, 1)); | |
3011 | expr = TREE_OPERAND (expr, 0); | |
3012 | } | |
5c475ba9 EB |
3013 | |
3014 | /* An expression which is a bitwise AND with a mask has a power-of-2 factor | |
3015 | corresponding to the number of trailing zeros of the mask. */ | |
3016 | if (TREE_CODE (expr) == BIT_AND_EXPR | |
3017 | && TREE_CODE (TREE_OPERAND (expr, 1)) == INTEGER_CST) | |
3018 | { | |
3019 | unsigned HOST_WIDE_INT mask = TREE_INT_CST_LOW (TREE_OPERAND (expr, 1)); | |
3020 | unsigned int i = 0; | |
3021 | ||
3022 | while ((mask & 1) == 0 && i < HOST_BITS_PER_WIDE_INT) | |
3023 | { | |
3024 | mask >>= 1; | |
3b5d86ec | 3025 | factor *= 2; |
5c475ba9 EB |
3026 | i++; |
3027 | } | |
3028 | } | |
3029 | ||
3b5d86ec PMR |
3030 | /* If the addend is not a multiple of the factor we found, give up. In |
3031 | theory we could find a smaller common factor but it's useless for our | |
3032 | needs. This situation arises when dealing with a field F1 with no | |
3033 | alignment requirement but that is following a field F2 with such | |
3034 | requirements. As long as we have F2's offset, we don't need alignment | |
3035 | information to compute F1's. */ | |
3036 | if (addend % factor != 0) | |
3037 | factor = 1; | |
3038 | ||
3039 | return factor * value; | |
5c475ba9 EB |
3040 | } |
3041 | ||
7d7fcb08 | 3042 | /* Given two consecutive field decls PREV_FIELD and CURR_FIELD, return true |
a1ab4c31 AC |
3043 | unless we can prove these 2 fields are laid out in such a way that no gap |
3044 | exist between the end of PREV_FIELD and the beginning of CURR_FIELD. OFFSET | |
3045 | is the distance in bits between the end of PREV_FIELD and the starting | |
3046 | position of CURR_FIELD. It is ignored if null. */ | |
3047 | ||
3048 | static bool | |
3049 | potential_alignment_gap (tree prev_field, tree curr_field, tree offset) | |
3050 | { | |
3051 | /* If this is the first field of the record, there cannot be any gap */ | |
3052 | if (!prev_field) | |
3053 | return false; | |
3054 | ||
78df6221 | 3055 | /* If the previous field is a union type, then return false: The only |
a1ab4c31 AC |
3056 | time when such a field is not the last field of the record is when |
3057 | there are other components at fixed positions after it (meaning there | |
3058 | was a rep clause for every field), in which case we don't want the | |
3059 | alignment constraint to override them. */ | |
3060 | if (TREE_CODE (TREE_TYPE (prev_field)) == QUAL_UNION_TYPE) | |
3061 | return false; | |
3062 | ||
3063 | /* If the distance between the end of prev_field and the beginning of | |
3064 | curr_field is constant, then there is a gap if the value of this | |
3065 | constant is not null. */ | |
cc269bb6 | 3066 | if (offset && tree_fits_uhwi_p (offset)) |
a1ab4c31 AC |
3067 | return !integer_zerop (offset); |
3068 | ||
3069 | /* If the size and position of the previous field are constant, | |
3070 | then check the sum of this size and position. There will be a gap | |
3071 | iff it is not multiple of the current field alignment. */ | |
cc269bb6 RS |
3072 | if (tree_fits_uhwi_p (DECL_SIZE (prev_field)) |
3073 | && tree_fits_uhwi_p (bit_position (prev_field))) | |
ae7e9ddd RS |
3074 | return ((tree_to_uhwi (bit_position (prev_field)) |
3075 | + tree_to_uhwi (DECL_SIZE (prev_field))) | |
a1ab4c31 AC |
3076 | % DECL_ALIGN (curr_field) != 0); |
3077 | ||
3078 | /* If both the position and size of the previous field are multiples | |
3079 | of the current field alignment, there cannot be any gap. */ | |
3080 | if (value_factor_p (bit_position (prev_field), DECL_ALIGN (curr_field)) | |
3081 | && value_factor_p (DECL_SIZE (prev_field), DECL_ALIGN (curr_field))) | |
3082 | return false; | |
3083 | ||
3084 | /* Fallback, return that there may be a potential gap */ | |
3085 | return true; | |
3086 | } | |
3087 | ||
6249559b EB |
3088 | /* Return a LABEL_DECL with NAME. GNAT_NODE is used for the position of |
3089 | the decl. */ | |
a1ab4c31 AC |
3090 | |
3091 | tree | |
6249559b | 3092 | create_label_decl (tree name, Node_Id gnat_node) |
a1ab4c31 | 3093 | { |
88a94e2b | 3094 | tree label_decl |
6249559b | 3095 | = build_decl (input_location, LABEL_DECL, name, void_type_node); |
a1ab4c31 | 3096 | |
88a94e2b EB |
3097 | DECL_MODE (label_decl) = VOIDmode; |
3098 | ||
3099 | /* Add this decl to the current binding level. */ | |
3100 | gnat_pushdecl (label_decl, gnat_node); | |
a1ab4c31 AC |
3101 | |
3102 | return label_decl; | |
3103 | } | |
3104 | \f | |
6249559b EB |
3105 | /* Return a FUNCTION_DECL node. NAME is the name of the subprogram, ASM_NAME |
3106 | its assembler name, TYPE its type (a FUNCTION_TYPE node), PARAM_DECL_LIST | |
3107 | the list of its parameters (a list of PARM_DECL nodes chained through the | |
3108 | DECL_CHAIN field). | |
a1ab4c31 | 3109 | |
2ade427a EB |
3110 | INLINE_STATUS describes the inline flags to be set on the FUNCTION_DECL. |
3111 | ||
1e55d29a EB |
3112 | PUBLIC_FLAG is true if this is for a reference to a public entity or for a |
3113 | definition to be made visible outside of the current compilation unit. | |
3114 | ||
3115 | EXTERN_FLAG is true when processing an external subprogram declaration. | |
c1a569ef EB |
3116 | |
3117 | ARTIFICIAL_P is true if the subprogram was generated by the compiler. | |
3118 | ||
3119 | DEBUG_INFO_P is true if we need to write debug information for it. | |
3120 | ||
2ade427a EB |
3121 | ATTR_LIST is the list of attributes to be attached to the subprogram. |
3122 | ||
c1a569ef | 3123 | GNAT_NODE is used for the position of the decl. */ |
a1ab4c31 AC |
3124 | |
3125 | tree | |
6249559b | 3126 | create_subprog_decl (tree name, tree asm_name, tree type, tree param_decl_list, |
1e55d29a EB |
3127 | enum inline_status_t inline_status, bool public_flag, |
3128 | bool extern_flag, bool artificial_p, bool debug_info_p, | |
6249559b | 3129 | struct attrib *attr_list, Node_Id gnat_node) |
a1ab4c31 | 3130 | { |
6249559b | 3131 | tree subprog_decl = build_decl (input_location, FUNCTION_DECL, name, type); |
7d7fcb08 | 3132 | DECL_ARGUMENTS (subprog_decl) = param_decl_list; |
a1ab4c31 | 3133 | |
c1a569ef | 3134 | DECL_ARTIFICIAL (subprog_decl) = artificial_p; |
7d7fcb08 | 3135 | DECL_EXTERNAL (subprog_decl) = extern_flag; |
1e55d29a EB |
3136 | TREE_PUBLIC (subprog_decl) = public_flag; |
3137 | ||
3138 | if (!debug_info_p) | |
3139 | DECL_IGNORED_P (subprog_decl) = 1; | |
0e24192c EB |
3140 | |
3141 | switch (inline_status) | |
3142 | { | |
3143 | case is_suppressed: | |
3144 | DECL_UNINLINABLE (subprog_decl) = 1; | |
3145 | break; | |
3146 | ||
3147 | case is_disabled: | |
3148 | break; | |
3149 | ||
f087ea44 AC |
3150 | case is_required: |
3151 | if (Back_End_Inlining) | |
1eb58520 AC |
3152 | decl_attributes (&subprog_decl, |
3153 | tree_cons (get_identifier ("always_inline"), | |
3154 | NULL_TREE, NULL_TREE), | |
3155 | ATTR_FLAG_TYPE_IN_PLACE); | |
3156 | ||
f087ea44 AC |
3157 | /* ... fall through ... */ |
3158 | ||
0e24192c EB |
3159 | case is_enabled: |
3160 | DECL_DECLARED_INLINE_P (subprog_decl) = 1; | |
c1a569ef | 3161 | DECL_NO_INLINE_WARNING_P (subprog_decl) = artificial_p; |
0e24192c EB |
3162 | break; |
3163 | ||
3164 | default: | |
3165 | gcc_unreachable (); | |
3166 | } | |
7d7fcb08 | 3167 | |
2b50232a EB |
3168 | process_attributes (&subprog_decl, &attr_list, true, gnat_node); |
3169 | ||
7414a3c3 EB |
3170 | /* Once everything is processed, finish the subprogram declaration. */ |
3171 | finish_subprog_decl (subprog_decl, asm_name, type); | |
3172 | ||
2b50232a EB |
3173 | /* Add this decl to the current binding level. */ |
3174 | gnat_pushdecl (subprog_decl, gnat_node); | |
3175 | ||
a1ab4c31 AC |
3176 | /* Output the assembler code and/or RTL for the declaration. */ |
3177 | rest_of_decl_compilation (subprog_decl, global_bindings_p (), 0); | |
3178 | ||
3179 | return subprog_decl; | |
3180 | } | |
1e55d29a | 3181 | |
7414a3c3 EB |
3182 | /* Given a subprogram declaration DECL, its assembler name and its type, |
3183 | finish constructing the subprogram declaration from ASM_NAME and TYPE. */ | |
1e55d29a EB |
3184 | |
3185 | void | |
7414a3c3 | 3186 | finish_subprog_decl (tree decl, tree asm_name, tree type) |
1e55d29a EB |
3187 | { |
3188 | tree result_decl | |
3189 | = build_decl (DECL_SOURCE_LOCATION (decl), RESULT_DECL, NULL_TREE, | |
3190 | TREE_TYPE (type)); | |
3191 | ||
3192 | DECL_ARTIFICIAL (result_decl) = 1; | |
3193 | DECL_IGNORED_P (result_decl) = 1; | |
3194 | DECL_BY_REFERENCE (result_decl) = TREE_ADDRESSABLE (type); | |
3195 | DECL_RESULT (decl) = result_decl; | |
3196 | ||
3197 | TREE_READONLY (decl) = TYPE_READONLY (type); | |
3198 | TREE_SIDE_EFFECTS (decl) = TREE_THIS_VOLATILE (decl) = TYPE_VOLATILE (type); | |
7414a3c3 EB |
3199 | |
3200 | if (asm_name) | |
3201 | { | |
3202 | /* Let the target mangle the name if this isn't a verbatim asm. */ | |
3203 | if (*IDENTIFIER_POINTER (asm_name) != '*') | |
3204 | asm_name = targetm.mangle_decl_assembler_name (decl, asm_name); | |
3205 | ||
3206 | SET_DECL_ASSEMBLER_NAME (decl, asm_name); | |
3207 | ||
3208 | /* The expand_main_function circuitry expects "main_identifier_node" to | |
3209 | designate the DECL_NAME of the 'main' entry point, in turn expected | |
3210 | to be declared as the "main" function literally by default. Ada | |
3211 | program entry points are typically declared with a different name | |
3212 | within the binder generated file, exported as 'main' to satisfy the | |
3213 | system expectations. Force main_identifier_node in this case. */ | |
3214 | if (asm_name == main_identifier_node) | |
3215 | DECL_NAME (decl) = main_identifier_node; | |
3216 | } | |
1e55d29a | 3217 | } |
a1ab4c31 AC |
3218 | \f |
3219 | /* Set up the framework for generating code for SUBPROG_DECL, a subprogram | |
3220 | body. This routine needs to be invoked before processing the declarations | |
3221 | appearing in the subprogram. */ | |
3222 | ||
3223 | void | |
3224 | begin_subprog_body (tree subprog_decl) | |
3225 | { | |
3226 | tree param_decl; | |
3227 | ||
a1ab4c31 AC |
3228 | announce_function (subprog_decl); |
3229 | ||
0ae44446 JR |
3230 | /* This function is being defined. */ |
3231 | TREE_STATIC (subprog_decl) = 1; | |
3232 | ||
e2d13a4a EB |
3233 | /* The failure of this assertion will likely come from a wrong context for |
3234 | the subprogram body, e.g. another procedure for a procedure declared at | |
3235 | library level. */ | |
3236 | gcc_assert (current_function_decl == decl_function_context (subprog_decl)); | |
3237 | ||
58c8f770 EB |
3238 | current_function_decl = subprog_decl; |
3239 | ||
a1ab4c31 AC |
3240 | /* Enter a new binding level and show that all the parameters belong to |
3241 | this function. */ | |
3242 | gnat_pushlevel (); | |
a09d56d8 | 3243 | |
a1ab4c31 | 3244 | for (param_decl = DECL_ARGUMENTS (subprog_decl); param_decl; |
910ad8de | 3245 | param_decl = DECL_CHAIN (param_decl)) |
a1ab4c31 AC |
3246 | DECL_CONTEXT (param_decl) = subprog_decl; |
3247 | ||
3248 | make_decl_rtl (subprog_decl); | |
a1ab4c31 AC |
3249 | } |
3250 | ||
71196d4e | 3251 | /* Finish translating the current subprogram and set its BODY. */ |
a1ab4c31 AC |
3252 | |
3253 | void | |
a406865a | 3254 | end_subprog_body (tree body) |
a1ab4c31 AC |
3255 | { |
3256 | tree fndecl = current_function_decl; | |
3257 | ||
bd9c7fb9 | 3258 | /* Attach the BLOCK for this level to the function and pop the level. */ |
a1ab4c31 AC |
3259 | BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl; |
3260 | DECL_INITIAL (fndecl) = current_binding_level->block; | |
3261 | gnat_poplevel (); | |
3262 | ||
a1ab4c31 AC |
3263 | /* Mark the RESULT_DECL as being in this subprogram. */ |
3264 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; | |
3265 | ||
a963da4d EB |
3266 | /* The body should be a BIND_EXPR whose BLOCK is the top-level one. */ |
3267 | if (TREE_CODE (body) == BIND_EXPR) | |
3268 | { | |
3269 | BLOCK_SUPERCONTEXT (BIND_EXPR_BLOCK (body)) = fndecl; | |
3270 | DECL_INITIAL (fndecl) = BIND_EXPR_BLOCK (body); | |
3271 | } | |
3272 | ||
a1ab4c31 AC |
3273 | DECL_SAVED_TREE (fndecl) = body; |
3274 | ||
228ee426 | 3275 | current_function_decl = decl_function_context (fndecl); |
71196d4e EB |
3276 | } |
3277 | ||
3278 | /* Wrap up compilation of SUBPROG_DECL, a subprogram body. */ | |
a1ab4c31 | 3279 | |
71196d4e EB |
3280 | void |
3281 | rest_of_subprog_body_compilation (tree subprog_decl) | |
3282 | { | |
a1ab4c31 AC |
3283 | /* We cannot track the location of errors past this point. */ |
3284 | error_gnat_node = Empty; | |
3285 | ||
3286 | /* If we're only annotating types, don't actually compile this function. */ | |
3287 | if (type_annotate_only) | |
3288 | return; | |
3289 | ||
a406865a | 3290 | /* Dump functions before gimplification. */ |
71196d4e | 3291 | dump_function (TDI_original, subprog_decl); |
a406865a | 3292 | |
228ee426 | 3293 | if (!decl_function_context (subprog_decl)) |
3dafb85c | 3294 | cgraph_node::finalize_function (subprog_decl, false); |
a1ab4c31 AC |
3295 | else |
3296 | /* Register this function with cgraph just far enough to get it | |
3297 | added to our parent's nested function list. */ | |
037e5573 | 3298 | (void) cgraph_node::get_create (subprog_decl); |
a1ab4c31 AC |
3299 | } |
3300 | ||
a1ab4c31 AC |
3301 | tree |
3302 | gnat_builtin_function (tree decl) | |
3303 | { | |
3304 | gnat_pushdecl (decl, Empty); | |
3305 | return decl; | |
3306 | } | |
3307 | ||
3308 | /* Return an integer type with the number of bits of precision given by | |
3309 | PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise | |
3310 | it is a signed type. */ | |
3311 | ||
3312 | tree | |
3313 | gnat_type_for_size (unsigned precision, int unsignedp) | |
3314 | { | |
3315 | tree t; | |
3316 | char type_name[20]; | |
3317 | ||
3318 | if (precision <= 2 * MAX_BITS_PER_WORD | |
3319 | && signed_and_unsigned_types[precision][unsignedp]) | |
3320 | return signed_and_unsigned_types[precision][unsignedp]; | |
3321 | ||
3322 | if (unsignedp) | |
3323 | t = make_unsigned_type (precision); | |
3324 | else | |
3325 | t = make_signed_type (precision); | |
3326 | ||
3327 | if (precision <= 2 * MAX_BITS_PER_WORD) | |
3328 | signed_and_unsigned_types[precision][unsignedp] = t; | |
3329 | ||
3330 | if (!TYPE_NAME (t)) | |
3331 | { | |
c3d79c60 | 3332 | sprintf (type_name, "%sSIGNED_%u", unsignedp ? "UN" : "", precision); |
a1ab4c31 AC |
3333 | TYPE_NAME (t) = get_identifier (type_name); |
3334 | } | |
3335 | ||
3336 | return t; | |
3337 | } | |
3338 | ||
3339 | /* Likewise for floating-point types. */ | |
3340 | ||
3341 | static tree | |
ef4bddc2 | 3342 | float_type_for_precision (int precision, machine_mode mode) |
a1ab4c31 AC |
3343 | { |
3344 | tree t; | |
3345 | char type_name[20]; | |
3346 | ||
3347 | if (float_types[(int) mode]) | |
3348 | return float_types[(int) mode]; | |
3349 | ||
3350 | float_types[(int) mode] = t = make_node (REAL_TYPE); | |
3351 | TYPE_PRECISION (t) = precision; | |
3352 | layout_type (t); | |
3353 | ||
3354 | gcc_assert (TYPE_MODE (t) == mode); | |
3355 | if (!TYPE_NAME (t)) | |
3356 | { | |
3357 | sprintf (type_name, "FLOAT_%d", precision); | |
3358 | TYPE_NAME (t) = get_identifier (type_name); | |
3359 | } | |
3360 | ||
3361 | return t; | |
3362 | } | |
3363 | ||
3364 | /* Return a data type that has machine mode MODE. UNSIGNEDP selects | |
3365 | an unsigned type; otherwise a signed type is returned. */ | |
3366 | ||
3367 | tree | |
ef4bddc2 | 3368 | gnat_type_for_mode (machine_mode mode, int unsignedp) |
a1ab4c31 AC |
3369 | { |
3370 | if (mode == BLKmode) | |
3371 | return NULL_TREE; | |
2799d18c EB |
3372 | |
3373 | if (mode == VOIDmode) | |
a1ab4c31 | 3374 | return void_type_node; |
2799d18c EB |
3375 | |
3376 | if (COMPLEX_MODE_P (mode)) | |
a1ab4c31 | 3377 | return NULL_TREE; |
2799d18c EB |
3378 | |
3379 | if (SCALAR_FLOAT_MODE_P (mode)) | |
a1ab4c31 | 3380 | return float_type_for_precision (GET_MODE_PRECISION (mode), mode); |
2799d18c EB |
3381 | |
3382 | if (SCALAR_INT_MODE_P (mode)) | |
a1ab4c31 | 3383 | return gnat_type_for_size (GET_MODE_BITSIZE (mode), unsignedp); |
2799d18c EB |
3384 | |
3385 | if (VECTOR_MODE_P (mode)) | |
3386 | { | |
ef4bddc2 | 3387 | machine_mode inner_mode = GET_MODE_INNER (mode); |
2799d18c EB |
3388 | tree inner_type = gnat_type_for_mode (inner_mode, unsignedp); |
3389 | if (inner_type) | |
3390 | return build_vector_type_for_mode (inner_type, mode); | |
3391 | } | |
3392 | ||
3393 | return NULL_TREE; | |
a1ab4c31 AC |
3394 | } |
3395 | ||
9a1bdc31 EB |
3396 | /* Return the signed or unsigned version of TYPE_NODE, a scalar type, the |
3397 | signedness being specified by UNSIGNEDP. */ | |
a1ab4c31 AC |
3398 | |
3399 | tree | |
9a1bdc31 | 3400 | gnat_signed_or_unsigned_type_for (int unsignedp, tree type_node) |
a1ab4c31 | 3401 | { |
825da0d2 EB |
3402 | if (type_node == char_type_node) |
3403 | return unsignedp ? unsigned_char_type_node : signed_char_type_node; | |
3404 | ||
9a1bdc31 | 3405 | tree type = gnat_type_for_size (TYPE_PRECISION (type_node), unsignedp); |
a1ab4c31 AC |
3406 | |
3407 | if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node)) | |
3408 | { | |
afc737f0 | 3409 | type = copy_type (type); |
a1ab4c31 AC |
3410 | TREE_TYPE (type) = type_node; |
3411 | } | |
3412 | else if (TREE_TYPE (type_node) | |
3413 | && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE | |
3414 | && TYPE_MODULAR_P (TREE_TYPE (type_node))) | |
3415 | { | |
afc737f0 | 3416 | type = copy_type (type); |
a1ab4c31 AC |
3417 | TREE_TYPE (type) = TREE_TYPE (type_node); |
3418 | } | |
3419 | ||
3420 | return type; | |
3421 | } | |
3422 | ||
3423 | /* Return 1 if the types T1 and T2 are compatible, i.e. if they can be | |
3424 | transparently converted to each other. */ | |
3425 | ||
3426 | int | |
3427 | gnat_types_compatible_p (tree t1, tree t2) | |
3428 | { | |
3429 | enum tree_code code; | |
3430 | ||
3431 | /* This is the default criterion. */ | |
3432 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
3433 | return 1; | |
3434 | ||
3435 | /* We only check structural equivalence here. */ | |
3436 | if ((code = TREE_CODE (t1)) != TREE_CODE (t2)) | |
3437 | return 0; | |
3438 | ||
7948ae37 OH |
3439 | /* Vector types are also compatible if they have the same number of subparts |
3440 | and the same form of (scalar) element type. */ | |
3441 | if (code == VECTOR_TYPE | |
3442 | && TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2) | |
3443 | && TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2)) | |
3444 | && TYPE_PRECISION (TREE_TYPE (t1)) == TYPE_PRECISION (TREE_TYPE (t2))) | |
3445 | return 1; | |
3446 | ||
cfa0bd19 | 3447 | /* Array types are also compatible if they are constrained and have the same |
ee45a32d | 3448 | domain(s), the same component type and the same scalar storage order. */ |
a1ab4c31 | 3449 | if (code == ARRAY_TYPE |
0adef32b JJ |
3450 | && (TYPE_DOMAIN (t1) == TYPE_DOMAIN (t2) |
3451 | || (TYPE_DOMAIN (t1) | |
b4680ca1 | 3452 | && TYPE_DOMAIN (t2) |
0adef32b JJ |
3453 | && tree_int_cst_equal (TYPE_MIN_VALUE (TYPE_DOMAIN (t1)), |
3454 | TYPE_MIN_VALUE (TYPE_DOMAIN (t2))) | |
3455 | && tree_int_cst_equal (TYPE_MAX_VALUE (TYPE_DOMAIN (t1)), | |
cfa0bd19 | 3456 | TYPE_MAX_VALUE (TYPE_DOMAIN (t2))))) |
96bba5e6 EB |
3457 | && (TREE_TYPE (t1) == TREE_TYPE (t2) |
3458 | || (TREE_CODE (TREE_TYPE (t1)) == ARRAY_TYPE | |
ee45a32d EB |
3459 | && gnat_types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2)))) |
3460 | && TYPE_REVERSE_STORAGE_ORDER (t1) == TYPE_REVERSE_STORAGE_ORDER (t2)) | |
a1ab4c31 AC |
3461 | return 1; |
3462 | ||
a1ab4c31 AC |
3463 | return 0; |
3464 | } | |
523e82a7 | 3465 | |
71196d4e EB |
3466 | /* Return true if EXPR is a useless type conversion. */ |
3467 | ||
3468 | bool | |
3469 | gnat_useless_type_conversion (tree expr) | |
3470 | { | |
3471 | if (CONVERT_EXPR_P (expr) | |
3472 | || TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
3473 | || TREE_CODE (expr) == NON_LVALUE_EXPR) | |
3474 | return gnat_types_compatible_p (TREE_TYPE (expr), | |
3475 | TREE_TYPE (TREE_OPERAND (expr, 0))); | |
3476 | ||
3477 | return false; | |
3478 | } | |
3479 | ||
523e82a7 EB |
3480 | /* Return true if T, a FUNCTION_TYPE, has the specified list of flags. */ |
3481 | ||
3482 | bool | |
3483 | fntype_same_flags_p (const_tree t, tree cico_list, bool return_unconstrained_p, | |
3484 | bool return_by_direct_ref_p, bool return_by_invisi_ref_p) | |
3485 | { | |
3486 | return TYPE_CI_CO_LIST (t) == cico_list | |
3487 | && TYPE_RETURN_UNCONSTRAINED_P (t) == return_unconstrained_p | |
3488 | && TYPE_RETURN_BY_DIRECT_REF_P (t) == return_by_direct_ref_p | |
3489 | && TREE_ADDRESSABLE (t) == return_by_invisi_ref_p; | |
3490 | } | |
a1ab4c31 AC |
3491 | \f |
3492 | /* EXP is an expression for the size of an object. If this size contains | |
3493 | discriminant references, replace them with the maximum (if MAX_P) or | |
3494 | minimum (if !MAX_P) possible value of the discriminant. */ | |
3495 | ||
3496 | tree | |
3497 | max_size (tree exp, bool max_p) | |
3498 | { | |
3499 | enum tree_code code = TREE_CODE (exp); | |
3500 | tree type = TREE_TYPE (exp); | |
3501 | ||
3502 | switch (TREE_CODE_CLASS (code)) | |
3503 | { | |
3504 | case tcc_declaration: | |
3505 | case tcc_constant: | |
3506 | return exp; | |
3507 | ||
3508 | case tcc_vl_exp: | |
3509 | if (code == CALL_EXPR) | |
3510 | { | |
f82a627c EB |
3511 | tree t, *argarray; |
3512 | int n, i; | |
3513 | ||
3514 | t = maybe_inline_call_in_expr (exp); | |
3515 | if (t) | |
3516 | return max_size (t, max_p); | |
a1ab4c31 | 3517 | |
f82a627c EB |
3518 | n = call_expr_nargs (exp); |
3519 | gcc_assert (n > 0); | |
2bb1fc26 | 3520 | argarray = XALLOCAVEC (tree, n); |
a1ab4c31 AC |
3521 | for (i = 0; i < n; i++) |
3522 | argarray[i] = max_size (CALL_EXPR_ARG (exp, i), max_p); | |
3523 | return build_call_array (type, CALL_EXPR_FN (exp), n, argarray); | |
3524 | } | |
3525 | break; | |
3526 | ||
3527 | case tcc_reference: | |
3528 | /* If this contains a PLACEHOLDER_EXPR, it is the thing we want to | |
3529 | modify. Otherwise, we treat it like a variable. */ | |
1eb58520 AC |
3530 | if (CONTAINS_PLACEHOLDER_P (exp)) |
3531 | { | |
3532 | tree val_type = TREE_TYPE (TREE_OPERAND (exp, 1)); | |
3533 | tree val = (max_p ? TYPE_MAX_VALUE (type) : TYPE_MIN_VALUE (type)); | |
3534 | return max_size (convert (get_base_type (val_type), val), true); | |
3535 | } | |
a1ab4c31 | 3536 | |
1eb58520 | 3537 | return exp; |
a1ab4c31 AC |
3538 | |
3539 | case tcc_comparison: | |
3540 | return max_p ? size_one_node : size_zero_node; | |
3541 | ||
3542 | case tcc_unary: | |
ce3da0d0 EB |
3543 | if (code == NON_LVALUE_EXPR) |
3544 | return max_size (TREE_OPERAND (exp, 0), max_p); | |
6625d7bc | 3545 | |
ce3da0d0 EB |
3546 | return fold_build1 (code, type, |
3547 | max_size (TREE_OPERAND (exp, 0), | |
3548 | code == NEGATE_EXPR ? !max_p : max_p)); | |
3549 | ||
a1ab4c31 | 3550 | case tcc_binary: |
ce3da0d0 EB |
3551 | { |
3552 | tree lhs = max_size (TREE_OPERAND (exp, 0), max_p); | |
3553 | tree rhs = max_size (TREE_OPERAND (exp, 1), | |
3554 | code == MINUS_EXPR ? !max_p : max_p); | |
3555 | ||
3556 | /* Special-case wanting the maximum value of a MIN_EXPR. | |
3557 | In that case, if one side overflows, return the other. */ | |
3558 | if (max_p && code == MIN_EXPR) | |
3559 | { | |
3560 | if (TREE_CODE (rhs) == INTEGER_CST && TREE_OVERFLOW (rhs)) | |
3561 | return lhs; | |
3562 | ||
3563 | if (TREE_CODE (lhs) == INTEGER_CST && TREE_OVERFLOW (lhs)) | |
3564 | return rhs; | |
3565 | } | |
3566 | ||
3567 | /* Likewise, handle a MINUS_EXPR or PLUS_EXPR with the LHS | |
3568 | overflowing and the RHS a variable. */ | |
3569 | if ((code == MINUS_EXPR || code == PLUS_EXPR) | |
3570 | && TREE_CODE (lhs) == INTEGER_CST | |
3571 | && TREE_OVERFLOW (lhs) | |
396e67d2 | 3572 | && TREE_CODE (rhs) != INTEGER_CST) |
ce3da0d0 EB |
3573 | return lhs; |
3574 | ||
396e67d2 EB |
3575 | /* If we are going to subtract a "negative" value in an unsigned type, |
3576 | do the operation as an addition of the negated value, in order to | |
3577 | avoid creating a spurious overflow below. */ | |
3578 | if (code == MINUS_EXPR | |
3579 | && TYPE_UNSIGNED (type) | |
3580 | && TREE_CODE (rhs) == INTEGER_CST | |
3581 | && !TREE_OVERFLOW (rhs) | |
3582 | && tree_int_cst_sign_bit (rhs) != 0) | |
3583 | { | |
3584 | rhs = fold_build1 (NEGATE_EXPR, type, rhs); | |
3585 | code = PLUS_EXPR; | |
3586 | } | |
3587 | ||
3588 | /* We need to detect overflows so we call size_binop here. */ | |
ce3da0d0 EB |
3589 | return size_binop (code, lhs, rhs); |
3590 | } | |
3591 | ||
a1ab4c31 AC |
3592 | case tcc_expression: |
3593 | switch (TREE_CODE_LENGTH (code)) | |
3594 | { | |
3595 | case 1: | |
722356ce EB |
3596 | if (code == SAVE_EXPR) |
3597 | return exp; | |
ce3da0d0 EB |
3598 | |
3599 | return fold_build1 (code, type, | |
3600 | max_size (TREE_OPERAND (exp, 0), max_p)); | |
a1ab4c31 AC |
3601 | |
3602 | case 2: | |
3603 | if (code == COMPOUND_EXPR) | |
3604 | return max_size (TREE_OPERAND (exp, 1), max_p); | |
3605 | ||
ce3da0d0 EB |
3606 | return fold_build2 (code, type, |
3607 | max_size (TREE_OPERAND (exp, 0), max_p), | |
3608 | max_size (TREE_OPERAND (exp, 1), max_p)); | |
a1ab4c31 AC |
3609 | |
3610 | case 3: | |
722356ce | 3611 | if (code == COND_EXPR) |
a1ab4c31 AC |
3612 | return fold_build2 (max_p ? MAX_EXPR : MIN_EXPR, type, |
3613 | max_size (TREE_OPERAND (exp, 1), max_p), | |
3614 | max_size (TREE_OPERAND (exp, 2), max_p)); | |
ce3da0d0 EB |
3615 | |
3616 | default: | |
3617 | break; | |
a1ab4c31 AC |
3618 | } |
3619 | ||
3620 | /* Other tree classes cannot happen. */ | |
3621 | default: | |
3622 | break; | |
3623 | } | |
3624 | ||
3625 | gcc_unreachable (); | |
3626 | } | |
3627 | \f | |
3628 | /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE. | |
3629 | EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs. | |
3630 | Return a constructor for the template. */ | |
3631 | ||
3632 | tree | |
3633 | build_template (tree template_type, tree array_type, tree expr) | |
3634 | { | |
9771b263 | 3635 | vec<constructor_elt, va_gc> *template_elts = NULL; |
a1ab4c31 AC |
3636 | tree bound_list = NULL_TREE; |
3637 | tree field; | |
3638 | ||
3639 | while (TREE_CODE (array_type) == RECORD_TYPE | |
315cff15 | 3640 | && (TYPE_PADDING_P (array_type) |
a1ab4c31 AC |
3641 | || TYPE_JUSTIFIED_MODULAR_P (array_type))) |
3642 | array_type = TREE_TYPE (TYPE_FIELDS (array_type)); | |
3643 | ||
3644 | if (TREE_CODE (array_type) == ARRAY_TYPE | |
3645 | || (TREE_CODE (array_type) == INTEGER_TYPE | |
3646 | && TYPE_HAS_ACTUAL_BOUNDS_P (array_type))) | |
3647 | bound_list = TYPE_ACTUAL_BOUNDS (array_type); | |
3648 | ||
3649 | /* First make the list for a CONSTRUCTOR for the template. Go down the | |
3650 | field list of the template instead of the type chain because this | |
3651 | array might be an Ada array of arrays and we can't tell where the | |
3652 | nested arrays stop being the underlying object. */ | |
3653 | ||
3654 | for (field = TYPE_FIELDS (template_type); field; | |
3655 | (bound_list | |
3656 | ? (bound_list = TREE_CHAIN (bound_list)) | |
3657 | : (array_type = TREE_TYPE (array_type))), | |
910ad8de | 3658 | field = DECL_CHAIN (DECL_CHAIN (field))) |
a1ab4c31 AC |
3659 | { |
3660 | tree bounds, min, max; | |
3661 | ||
3662 | /* If we have a bound list, get the bounds from there. Likewise | |
3663 | for an ARRAY_TYPE. Otherwise, if expr is a PARM_DECL with | |
3664 | DECL_BY_COMPONENT_PTR_P, use the bounds of the field in the template. | |
3665 | This will give us a maximum range. */ | |
3666 | if (bound_list) | |
3667 | bounds = TREE_VALUE (bound_list); | |
3668 | else if (TREE_CODE (array_type) == ARRAY_TYPE) | |
3669 | bounds = TYPE_INDEX_TYPE (TYPE_DOMAIN (array_type)); | |
3670 | else if (expr && TREE_CODE (expr) == PARM_DECL | |
3671 | && DECL_BY_COMPONENT_PTR_P (expr)) | |
3672 | bounds = TREE_TYPE (field); | |
3673 | else | |
3674 | gcc_unreachable (); | |
3675 | ||
3676 | min = convert (TREE_TYPE (field), TYPE_MIN_VALUE (bounds)); | |
910ad8de | 3677 | max = convert (TREE_TYPE (DECL_CHAIN (field)), TYPE_MAX_VALUE (bounds)); |
a1ab4c31 AC |
3678 | |
3679 | /* If either MIN or MAX involve a PLACEHOLDER_EXPR, we must | |
3680 | substitute it from OBJECT. */ | |
3681 | min = SUBSTITUTE_PLACEHOLDER_IN_EXPR (min, expr); | |
3682 | max = SUBSTITUTE_PLACEHOLDER_IN_EXPR (max, expr); | |
3683 | ||
0e228dd9 | 3684 | CONSTRUCTOR_APPEND_ELT (template_elts, field, min); |
910ad8de | 3685 | CONSTRUCTOR_APPEND_ELT (template_elts, DECL_CHAIN (field), max); |
a1ab4c31 AC |
3686 | } |
3687 | ||
0e228dd9 | 3688 | return gnat_build_constructor (template_type, template_elts); |
a1ab4c31 AC |
3689 | } |
3690 | \f | |
e63b36bd EB |
3691 | /* Return true if TYPE is suitable for the element type of a vector. */ |
3692 | ||
3693 | static bool | |
3694 | type_for_vector_element_p (tree type) | |
3695 | { | |
ef4bddc2 | 3696 | machine_mode mode; |
e63b36bd EB |
3697 | |
3698 | if (!INTEGRAL_TYPE_P (type) | |
3699 | && !SCALAR_FLOAT_TYPE_P (type) | |
3700 | && !FIXED_POINT_TYPE_P (type)) | |
3701 | return false; | |
3702 | ||
3703 | mode = TYPE_MODE (type); | |
3704 | if (GET_MODE_CLASS (mode) != MODE_INT | |
3705 | && !SCALAR_FLOAT_MODE_P (mode) | |
3706 | && !ALL_SCALAR_FIXED_POINT_MODE_P (mode)) | |
3707 | return false; | |
3708 | ||
3709 | return true; | |
3710 | } | |
3711 | ||
3712 | /* Return a vector type given the SIZE and the INNER_TYPE, or NULL_TREE if | |
3713 | this is not possible. If ATTRIBUTE is non-zero, we are processing the | |
3714 | attribute declaration and want to issue error messages on failure. */ | |
3715 | ||
3716 | static tree | |
3717 | build_vector_type_for_size (tree inner_type, tree size, tree attribute) | |
3718 | { | |
3719 | unsigned HOST_WIDE_INT size_int, inner_size_int; | |
3720 | int nunits; | |
3721 | ||
3722 | /* Silently punt on variable sizes. We can't make vector types for them, | |
3723 | need to ignore them on front-end generated subtypes of unconstrained | |
3724 | base types, and this attribute is for binding implementors, not end | |
3725 | users, so we should never get there from legitimate explicit uses. */ | |
3726 | if (!tree_fits_uhwi_p (size)) | |
3727 | return NULL_TREE; | |
3728 | size_int = tree_to_uhwi (size); | |
3729 | ||
3730 | if (!type_for_vector_element_p (inner_type)) | |
3731 | { | |
3732 | if (attribute) | |
3733 | error ("invalid element type for attribute %qs", | |
3734 | IDENTIFIER_POINTER (attribute)); | |
3735 | return NULL_TREE; | |
3736 | } | |
3737 | inner_size_int = tree_to_uhwi (TYPE_SIZE_UNIT (inner_type)); | |
3738 | ||
3739 | if (size_int % inner_size_int) | |
3740 | { | |
3741 | if (attribute) | |
3742 | error ("vector size not an integral multiple of component size"); | |
3743 | return NULL_TREE; | |
3744 | } | |
3745 | ||
3746 | if (size_int == 0) | |
3747 | { | |
3748 | if (attribute) | |
3749 | error ("zero vector size"); | |
3750 | return NULL_TREE; | |
3751 | } | |
3752 | ||
3753 | nunits = size_int / inner_size_int; | |
3754 | if (nunits & (nunits - 1)) | |
3755 | { | |
3756 | if (attribute) | |
3757 | error ("number of components of vector not a power of two"); | |
3758 | return NULL_TREE; | |
3759 | } | |
3760 | ||
3761 | return build_vector_type (inner_type, nunits); | |
3762 | } | |
3763 | ||
3764 | /* Return a vector type whose representative array type is ARRAY_TYPE, or | |
3765 | NULL_TREE if this is not possible. If ATTRIBUTE is non-zero, we are | |
3766 | processing the attribute and want to issue error messages on failure. */ | |
3767 | ||
3768 | static tree | |
3769 | build_vector_type_for_array (tree array_type, tree attribute) | |
3770 | { | |
3771 | tree vector_type = build_vector_type_for_size (TREE_TYPE (array_type), | |
3772 | TYPE_SIZE_UNIT (array_type), | |
3773 | attribute); | |
3774 | if (!vector_type) | |
3775 | return NULL_TREE; | |
3776 | ||
3777 | TYPE_REPRESENTATIVE_ARRAY (vector_type) = array_type; | |
3778 | return vector_type; | |
3779 | } | |
3780 | \f | |
928dfa4b EB |
3781 | /* Build a type to be used to represent an aliased object whose nominal type |
3782 | is an unconstrained array. This consists of a RECORD_TYPE containing a | |
3783 | field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an ARRAY_TYPE. | |
3784 | If ARRAY_TYPE is that of an unconstrained array, this is used to represent | |
3785 | an arbitrary unconstrained object. Use NAME as the name of the record. | |
3786 | DEBUG_INFO_P is true if we need to write debug information for the type. */ | |
a1ab4c31 AC |
3787 | |
3788 | tree | |
928dfa4b EB |
3789 | build_unc_object_type (tree template_type, tree object_type, tree name, |
3790 | bool debug_info_p) | |
a1ab4c31 | 3791 | { |
24d4b3d5 | 3792 | tree decl; |
a1ab4c31 | 3793 | tree type = make_node (RECORD_TYPE); |
da01bfee EB |
3794 | tree template_field |
3795 | = create_field_decl (get_identifier ("BOUNDS"), template_type, type, | |
3796 | NULL_TREE, NULL_TREE, 0, 1); | |
3797 | tree array_field | |
3798 | = create_field_decl (get_identifier ("ARRAY"), object_type, type, | |
3799 | NULL_TREE, NULL_TREE, 0, 1); | |
a1ab4c31 AC |
3800 | |
3801 | TYPE_NAME (type) = name; | |
3802 | TYPE_CONTAINS_TEMPLATE_P (type) = 1; | |
910ad8de | 3803 | DECL_CHAIN (template_field) = array_field; |
928dfa4b EB |
3804 | finish_record_type (type, template_field, 0, true); |
3805 | ||
3806 | /* Declare it now since it will never be declared otherwise. This is | |
3807 | necessary to ensure that its subtrees are properly marked. */ | |
24d4b3d5 AC |
3808 | decl = create_type_decl (name, type, true, debug_info_p, Empty); |
3809 | ||
3810 | /* template_type will not be used elsewhere than here, so to keep the debug | |
3811 | info clean and in order to avoid scoping issues, make decl its | |
3812 | context. */ | |
3813 | gnat_set_type_context (template_type, decl); | |
a1ab4c31 AC |
3814 | |
3815 | return type; | |
3816 | } | |
3817 | ||
3818 | /* Same, taking a thin or fat pointer type instead of a template type. */ | |
3819 | ||
3820 | tree | |
3821 | build_unc_object_type_from_ptr (tree thin_fat_ptr_type, tree object_type, | |
928dfa4b | 3822 | tree name, bool debug_info_p) |
a1ab4c31 AC |
3823 | { |
3824 | tree template_type; | |
3825 | ||
315cff15 | 3826 | gcc_assert (TYPE_IS_FAT_OR_THIN_POINTER_P (thin_fat_ptr_type)); |
a1ab4c31 AC |
3827 | |
3828 | template_type | |
315cff15 | 3829 | = (TYPE_IS_FAT_POINTER_P (thin_fat_ptr_type) |
910ad8de | 3830 | ? TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (thin_fat_ptr_type)))) |
a1ab4c31 | 3831 | : TREE_TYPE (TYPE_FIELDS (TREE_TYPE (thin_fat_ptr_type)))); |
928dfa4b EB |
3832 | |
3833 | return | |
3834 | build_unc_object_type (template_type, object_type, name, debug_info_p); | |
a1ab4c31 | 3835 | } |
a1ab4c31 | 3836 | \f |
229077b0 EB |
3837 | /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE. |
3838 | In the normal case this is just two adjustments, but we have more to | |
3839 | do if NEW_TYPE is an UNCONSTRAINED_ARRAY_TYPE. */ | |
a1ab4c31 AC |
3840 | |
3841 | void | |
3842 | update_pointer_to (tree old_type, tree new_type) | |
3843 | { | |
3844 | tree ptr = TYPE_POINTER_TO (old_type); | |
3845 | tree ref = TYPE_REFERENCE_TO (old_type); | |
aeecf17c | 3846 | tree t; |
a1ab4c31 AC |
3847 | |
3848 | /* If this is the main variant, process all the other variants first. */ | |
3849 | if (TYPE_MAIN_VARIANT (old_type) == old_type) | |
aeecf17c EB |
3850 | for (t = TYPE_NEXT_VARIANT (old_type); t; t = TYPE_NEXT_VARIANT (t)) |
3851 | update_pointer_to (t, new_type); | |
a1ab4c31 | 3852 | |
229077b0 | 3853 | /* If no pointers and no references, we are done. */ |
a1ab4c31 AC |
3854 | if (!ptr && !ref) |
3855 | return; | |
3856 | ||
3857 | /* Merge the old type qualifiers in the new type. | |
3858 | ||
3859 | Each old variant has qualifiers for specific reasons, and the new | |
229077b0 | 3860 | designated type as well. Each set of qualifiers represents useful |
a1ab4c31 AC |
3861 | information grabbed at some point, and merging the two simply unifies |
3862 | these inputs into the final type description. | |
3863 | ||
3864 | Consider for instance a volatile type frozen after an access to constant | |
229077b0 EB |
3865 | type designating it; after the designated type's freeze, we get here with |
3866 | a volatile NEW_TYPE and a dummy OLD_TYPE with a readonly variant, created | |
3867 | when the access type was processed. We will make a volatile and readonly | |
a1ab4c31 AC |
3868 | designated type, because that's what it really is. |
3869 | ||
229077b0 EB |
3870 | We might also get here for a non-dummy OLD_TYPE variant with different |
3871 | qualifiers than those of NEW_TYPE, for instance in some cases of pointers | |
a1ab4c31 | 3872 | to private record type elaboration (see the comments around the call to |
229077b0 EB |
3873 | this routine in gnat_to_gnu_entity <E_Access_Type>). We have to merge |
3874 | the qualifiers in those cases too, to avoid accidentally discarding the | |
3875 | initial set, and will often end up with OLD_TYPE == NEW_TYPE then. */ | |
3876 | new_type | |
3877 | = build_qualified_type (new_type, | |
3878 | TYPE_QUALS (old_type) | TYPE_QUALS (new_type)); | |
3879 | ||
3880 | /* If old type and new type are identical, there is nothing to do. */ | |
a1ab4c31 AC |
3881 | if (old_type == new_type) |
3882 | return; | |
3883 | ||
3884 | /* Otherwise, first handle the simple case. */ | |
3885 | if (TREE_CODE (new_type) != UNCONSTRAINED_ARRAY_TYPE) | |
3886 | { | |
aeecf17c EB |
3887 | tree new_ptr, new_ref; |
3888 | ||
3889 | /* If pointer or reference already points to new type, nothing to do. | |
3890 | This can happen as update_pointer_to can be invoked multiple times | |
3891 | on the same couple of types because of the type variants. */ | |
3892 | if ((ptr && TREE_TYPE (ptr) == new_type) | |
3893 | || (ref && TREE_TYPE (ref) == new_type)) | |
3894 | return; | |
3895 | ||
3896 | /* Chain PTR and its variants at the end. */ | |
3897 | new_ptr = TYPE_POINTER_TO (new_type); | |
3898 | if (new_ptr) | |
3899 | { | |
3900 | while (TYPE_NEXT_PTR_TO (new_ptr)) | |
3901 | new_ptr = TYPE_NEXT_PTR_TO (new_ptr); | |
3902 | TYPE_NEXT_PTR_TO (new_ptr) = ptr; | |
3903 | } | |
3904 | else | |
3905 | TYPE_POINTER_TO (new_type) = ptr; | |
a1ab4c31 | 3906 | |
aeecf17c | 3907 | /* Now adjust them. */ |
a1ab4c31 | 3908 | for (; ptr; ptr = TYPE_NEXT_PTR_TO (ptr)) |
aeecf17c | 3909 | for (t = TYPE_MAIN_VARIANT (ptr); t; t = TYPE_NEXT_VARIANT (t)) |
50179d58 EB |
3910 | { |
3911 | TREE_TYPE (t) = new_type; | |
3912 | if (TYPE_NULL_BOUNDS (t)) | |
3913 | TREE_TYPE (TREE_OPERAND (TYPE_NULL_BOUNDS (t), 0)) = new_type; | |
3914 | } | |
de9528f0 | 3915 | |
aeecf17c EB |
3916 | /* Chain REF and its variants at the end. */ |
3917 | new_ref = TYPE_REFERENCE_TO (new_type); | |
3918 | if (new_ref) | |
3919 | { | |
3920 | while (TYPE_NEXT_REF_TO (new_ref)) | |
3921 | new_ref = TYPE_NEXT_REF_TO (new_ref); | |
3922 | TYPE_NEXT_REF_TO (new_ref) = ref; | |
3923 | } | |
3924 | else | |
3925 | TYPE_REFERENCE_TO (new_type) = ref; | |
3926 | ||
3927 | /* Now adjust them. */ | |
a1ab4c31 | 3928 | for (; ref; ref = TYPE_NEXT_REF_TO (ref)) |
aeecf17c EB |
3929 | for (t = TYPE_MAIN_VARIANT (ref); t; t = TYPE_NEXT_VARIANT (t)) |
3930 | TREE_TYPE (t) = new_type; | |
de9528f0 EB |
3931 | |
3932 | TYPE_POINTER_TO (old_type) = NULL_TREE; | |
3bd6ca3f | 3933 | TYPE_REFERENCE_TO (old_type) = NULL_TREE; |
a1ab4c31 AC |
3934 | } |
3935 | ||
aeecf17c EB |
3936 | /* Now deal with the unconstrained array case. In this case the pointer |
3937 | is actually a record where both fields are pointers to dummy nodes. | |
e3edbd56 EB |
3938 | Turn them into pointers to the correct types using update_pointer_to. |
3939 | Likewise for the pointer to the object record (thin pointer). */ | |
a1ab4c31 AC |
3940 | else |
3941 | { | |
e3edbd56 | 3942 | tree new_ptr = TYPE_POINTER_TO (new_type); |
aeecf17c EB |
3943 | |
3944 | gcc_assert (TYPE_IS_FAT_POINTER_P (ptr)); | |
3945 | ||
e3edbd56 | 3946 | /* If PTR already points to NEW_TYPE, nothing to do. This can happen |
aeecf17c EB |
3947 | since update_pointer_to can be invoked multiple times on the same |
3948 | couple of types because of the type variants. */ | |
3949 | if (TYPE_UNCONSTRAINED_ARRAY (ptr) == new_type) | |
3950 | return; | |
3951 | ||
a1ab4c31 | 3952 | update_pointer_to |
e3edbd56 EB |
3953 | (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (ptr))), |
3954 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS (new_ptr)))); | |
a1ab4c31 | 3955 | |
a1ab4c31 | 3956 | update_pointer_to |
e3edbd56 EB |
3957 | (TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (ptr)))), |
3958 | TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (new_ptr))))); | |
aeecf17c | 3959 | |
e3edbd56 EB |
3960 | update_pointer_to (TYPE_OBJECT_RECORD_TYPE (old_type), |
3961 | TYPE_OBJECT_RECORD_TYPE (new_type)); | |
a1ab4c31 | 3962 | |
e3edbd56 | 3963 | TYPE_POINTER_TO (old_type) = NULL_TREE; |
1e55d29a | 3964 | TYPE_REFERENCE_TO (old_type) = NULL_TREE; |
a1ab4c31 AC |
3965 | } |
3966 | } | |
3967 | \f | |
8df2e902 EB |
3968 | /* Convert EXPR, a pointer to a constrained array, into a pointer to an |
3969 | unconstrained one. This involves making or finding a template. */ | |
a1ab4c31 AC |
3970 | |
3971 | static tree | |
3972 | convert_to_fat_pointer (tree type, tree expr) | |
3973 | { | |
910ad8de | 3974 | tree template_type = TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type)))); |
8df2e902 | 3975 | tree p_array_type = TREE_TYPE (TYPE_FIELDS (type)); |
a1ab4c31 | 3976 | tree etype = TREE_TYPE (expr); |
88293f03 | 3977 | tree template_addr; |
9771b263 DN |
3978 | vec<constructor_elt, va_gc> *v; |
3979 | vec_alloc (v, 2); | |
a1ab4c31 | 3980 | |
50179d58 EB |
3981 | /* If EXPR is null, make a fat pointer that contains a null pointer to the |
3982 | array (compare_fat_pointers ensures that this is the full discriminant) | |
3983 | and a valid pointer to the bounds. This latter property is necessary | |
3984 | since the compiler can hoist the load of the bounds done through it. */ | |
a1ab4c31 | 3985 | if (integer_zerop (expr)) |
0e228dd9 | 3986 | { |
50179d58 EB |
3987 | tree ptr_template_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type))); |
3988 | tree null_bounds, t; | |
3989 | ||
3990 | if (TYPE_NULL_BOUNDS (ptr_template_type)) | |
3991 | null_bounds = TYPE_NULL_BOUNDS (ptr_template_type); | |
3992 | else | |
3993 | { | |
3994 | /* The template type can still be dummy at this point so we build an | |
3995 | empty constructor. The middle-end will fill it in with zeros. */ | |
90b4c164 | 3996 | t = build_constructor (template_type, NULL); |
50179d58 EB |
3997 | TREE_CONSTANT (t) = TREE_STATIC (t) = 1; |
3998 | null_bounds = build_unary_op (ADDR_EXPR, NULL_TREE, t); | |
3999 | SET_TYPE_NULL_BOUNDS (ptr_template_type, null_bounds); | |
4000 | } | |
4001 | ||
0e228dd9 | 4002 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
50179d58 EB |
4003 | fold_convert (p_array_type, null_pointer_node)); |
4004 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), null_bounds); | |
4005 | t = build_constructor (type, v); | |
4006 | /* Do not set TREE_CONSTANT so as to force T to static memory. */ | |
4007 | TREE_CONSTANT (t) = 0; | |
4008 | TREE_STATIC (t) = 1; | |
4009 | ||
4010 | return t; | |
0e228dd9 | 4011 | } |
a1ab4c31 | 4012 | |
0d7de0e1 EB |
4013 | /* If EXPR is a thin pointer, make template and data from the record. */ |
4014 | if (TYPE_IS_THIN_POINTER_P (etype)) | |
a1ab4c31 | 4015 | { |
0d7de0e1 | 4016 | tree field = TYPE_FIELDS (TREE_TYPE (etype)); |
a1ab4c31 | 4017 | |
7d7a1fe8 | 4018 | expr = gnat_protect_expr (expr); |
88293f03 EB |
4019 | |
4020 | /* If we have a TYPE_UNCONSTRAINED_ARRAY attached to the RECORD_TYPE, | |
4021 | the thin pointer value has been shifted so we shift it back to get | |
4022 | the template address. */ | |
4023 | if (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (etype))) | |
2b45154d | 4024 | { |
88293f03 EB |
4025 | template_addr |
4026 | = build_binary_op (POINTER_PLUS_EXPR, etype, expr, | |
4027 | fold_build1 (NEGATE_EXPR, sizetype, | |
4028 | byte_position | |
4029 | (DECL_CHAIN (field)))); | |
4030 | template_addr | |
4031 | = fold_convert (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type))), | |
4032 | template_addr); | |
2b45154d | 4033 | } |
a1ab4c31 | 4034 | |
88293f03 EB |
4035 | /* Otherwise we explicitly take the address of the fields. */ |
4036 | else | |
4037 | { | |
4038 | expr = build_unary_op (INDIRECT_REF, NULL_TREE, expr); | |
4039 | template_addr | |
4040 | = build_unary_op (ADDR_EXPR, NULL_TREE, | |
64235766 | 4041 | build_component_ref (expr, field, false)); |
88293f03 | 4042 | expr = build_unary_op (ADDR_EXPR, NULL_TREE, |
64235766 | 4043 | build_component_ref (expr, DECL_CHAIN (field), |
88293f03 EB |
4044 | false)); |
4045 | } | |
a1ab4c31 | 4046 | } |
8df2e902 EB |
4047 | |
4048 | /* Otherwise, build the constructor for the template. */ | |
a1ab4c31 | 4049 | else |
88293f03 EB |
4050 | template_addr |
4051 | = build_unary_op (ADDR_EXPR, NULL_TREE, | |
4052 | build_template (template_type, TREE_TYPE (etype), | |
4053 | expr)); | |
a1ab4c31 | 4054 | |
8df2e902 | 4055 | /* The final result is a constructor for the fat pointer. |
a1ab4c31 | 4056 | |
8df2e902 EB |
4057 | If EXPR is an argument of a foreign convention subprogram, the type it |
4058 | points to is directly the component type. In this case, the expression | |
a1ab4c31 | 4059 | type may not match the corresponding FIELD_DECL type at this point, so we |
8df2e902 | 4060 | call "convert" here to fix that up if necessary. This type consistency is |
a1ab4c31 | 4061 | required, for instance because it ensures that possible later folding of |
8df2e902 | 4062 | COMPONENT_REFs against this constructor always yields something of the |
a1ab4c31 AC |
4063 | same type as the initial reference. |
4064 | ||
8df2e902 EB |
4065 | Note that the call to "build_template" above is still fine because it |
4066 | will only refer to the provided TEMPLATE_TYPE in this case. */ | |
88293f03 EB |
4067 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), convert (p_array_type, expr)); |
4068 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), template_addr); | |
0e228dd9 | 4069 | return gnat_build_constructor (type, v); |
a1ab4c31 AC |
4070 | } |
4071 | \f | |
a1ab4c31 AC |
4072 | /* Create an expression whose value is that of EXPR, |
4073 | converted to type TYPE. The TREE_TYPE of the value | |
4074 | is always TYPE. This function implements all reasonable | |
4075 | conversions; callers should filter out those that are | |
4076 | not permitted by the language being compiled. */ | |
4077 | ||
4078 | tree | |
4079 | convert (tree type, tree expr) | |
4080 | { | |
a1ab4c31 AC |
4081 | tree etype = TREE_TYPE (expr); |
4082 | enum tree_code ecode = TREE_CODE (etype); | |
c34f3839 | 4083 | enum tree_code code = TREE_CODE (type); |
a1ab4c31 | 4084 | |
c34f3839 EB |
4085 | /* If the expression is already of the right type, we are done. */ |
4086 | if (etype == type) | |
a1ab4c31 AC |
4087 | return expr; |
4088 | ||
4089 | /* If both input and output have padding and are of variable size, do this | |
4090 | as an unchecked conversion. Likewise if one is a mere variant of the | |
4091 | other, so we avoid a pointless unpad/repad sequence. */ | |
4092 | else if (code == RECORD_TYPE && ecode == RECORD_TYPE | |
315cff15 | 4093 | && TYPE_PADDING_P (type) && TYPE_PADDING_P (etype) |
a1ab4c31 AC |
4094 | && (!TREE_CONSTANT (TYPE_SIZE (type)) |
4095 | || !TREE_CONSTANT (TYPE_SIZE (etype)) | |
842d4ee2 | 4096 | || TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (etype) |
a1ab4c31 AC |
4097 | || TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type))) |
4098 | == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (etype))))) | |
4099 | ; | |
4100 | ||
f88facfe EB |
4101 | /* If the output type has padding, convert to the inner type and make a |
4102 | constructor to build the record, unless a variable size is involved. */ | |
315cff15 | 4103 | else if (code == RECORD_TYPE && TYPE_PADDING_P (type)) |
a1ab4c31 | 4104 | { |
9771b263 | 4105 | vec<constructor_elt, va_gc> *v; |
0e228dd9 | 4106 | |
a1ab4c31 AC |
4107 | /* If we previously converted from another type and our type is |
4108 | of variable size, remove the conversion to avoid the need for | |
f88facfe | 4109 | variable-sized temporaries. Likewise for a conversion between |
a1ab4c31 AC |
4110 | original and packable version. */ |
4111 | if (TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
4112 | && (!TREE_CONSTANT (TYPE_SIZE (type)) | |
4113 | || (ecode == RECORD_TYPE | |
4114 | && TYPE_NAME (etype) | |
4115 | == TYPE_NAME (TREE_TYPE (TREE_OPERAND (expr, 0)))))) | |
4116 | expr = TREE_OPERAND (expr, 0); | |
4117 | ||
4118 | /* If we are just removing the padding from expr, convert the original | |
4119 | object if we have variable size in order to avoid the need for some | |
f88facfe | 4120 | variable-sized temporaries. Likewise if the padding is a variant |
a1ab4c31 AC |
4121 | of the other, so we avoid a pointless unpad/repad sequence. */ |
4122 | if (TREE_CODE (expr) == COMPONENT_REF | |
a1ab4c31 AC |
4123 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (expr, 0))) |
4124 | && (!TREE_CONSTANT (TYPE_SIZE (type)) | |
842d4ee2 EB |
4125 | || TYPE_MAIN_VARIANT (type) |
4126 | == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (expr, 0))) | |
a1ab4c31 AC |
4127 | || (ecode == RECORD_TYPE |
4128 | && TYPE_NAME (etype) | |
4129 | == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type)))))) | |
4130 | return convert (type, TREE_OPERAND (expr, 0)); | |
4131 | ||
431cfac1 EB |
4132 | /* If the inner type is of self-referential size and the expression type |
4133 | is a record, do this as an unchecked conversion. But first pad the | |
4134 | expression if possible to have the same size on both sides. */ | |
c34f3839 | 4135 | if (ecode == RECORD_TYPE |
f88facfe | 4136 | && CONTAINS_PLACEHOLDER_P (DECL_SIZE (TYPE_FIELDS (type)))) |
431cfac1 | 4137 | { |
980a0501 | 4138 | if (TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST) |
431cfac1 | 4139 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, |
980a0501 EB |
4140 | false, false, false, true), |
4141 | expr); | |
431cfac1 EB |
4142 | return unchecked_convert (type, expr, false); |
4143 | } | |
a1ab4c31 | 4144 | |
f88facfe EB |
4145 | /* If we are converting between array types with variable size, do the |
4146 | final conversion as an unchecked conversion, again to avoid the need | |
4147 | for some variable-sized temporaries. If valid, this conversion is | |
4148 | very likely purely technical and without real effects. */ | |
c34f3839 | 4149 | if (ecode == ARRAY_TYPE |
f88facfe EB |
4150 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == ARRAY_TYPE |
4151 | && !TREE_CONSTANT (TYPE_SIZE (etype)) | |
4152 | && !TREE_CONSTANT (TYPE_SIZE (type))) | |
4153 | return unchecked_convert (type, | |
4154 | convert (TREE_TYPE (TYPE_FIELDS (type)), | |
4155 | expr), | |
4156 | false); | |
4157 | ||
9771b263 | 4158 | vec_alloc (v, 1); |
0e228dd9 NF |
4159 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
4160 | convert (TREE_TYPE (TYPE_FIELDS (type)), expr)); | |
4161 | return gnat_build_constructor (type, v); | |
a1ab4c31 AC |
4162 | } |
4163 | ||
4164 | /* If the input type has padding, remove it and convert to the output type. | |
4165 | The conditions ordering is arranged to ensure that the output type is not | |
4166 | a padding type here, as it is not clear whether the conversion would | |
4167 | always be correct if this was to happen. */ | |
315cff15 | 4168 | else if (ecode == RECORD_TYPE && TYPE_PADDING_P (etype)) |
a1ab4c31 AC |
4169 | { |
4170 | tree unpadded; | |
4171 | ||
4172 | /* If we have just converted to this padded type, just get the | |
4173 | inner expression. */ | |
2117b9bb EB |
4174 | if (TREE_CODE (expr) == CONSTRUCTOR) |
4175 | unpadded = CONSTRUCTOR_ELT (expr, 0)->value; | |
a1ab4c31 AC |
4176 | |
4177 | /* Otherwise, build an explicit component reference. */ | |
4178 | else | |
64235766 | 4179 | unpadded = build_component_ref (expr, TYPE_FIELDS (etype), false); |
a1ab4c31 AC |
4180 | |
4181 | return convert (type, unpadded); | |
4182 | } | |
4183 | ||
4184 | /* If the input is a biased type, adjust first. */ | |
4185 | if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype)) | |
4186 | return convert (type, fold_build2 (PLUS_EXPR, TREE_TYPE (etype), | |
1eb58520 | 4187 | fold_convert (TREE_TYPE (etype), expr), |
a1ab4c31 | 4188 | fold_convert (TREE_TYPE (etype), |
1eb58520 | 4189 | TYPE_MIN_VALUE (etype)))); |
a1ab4c31 AC |
4190 | |
4191 | /* If the input is a justified modular type, we need to extract the actual | |
4192 | object before converting it to any other type with the exceptions of an | |
4193 | unconstrained array or of a mere type variant. It is useful to avoid the | |
4194 | extraction and conversion in the type variant case because it could end | |
4195 | up replacing a VAR_DECL expr by a constructor and we might be about the | |
4196 | take the address of the result. */ | |
4197 | if (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype) | |
4198 | && code != UNCONSTRAINED_ARRAY_TYPE | |
4199 | && TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (etype)) | |
64235766 EB |
4200 | return |
4201 | convert (type, build_component_ref (expr, TYPE_FIELDS (etype), false)); | |
a1ab4c31 AC |
4202 | |
4203 | /* If converting to a type that contains a template, convert to the data | |
4204 | type and then build the template. */ | |
4205 | if (code == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (type)) | |
4206 | { | |
910ad8de | 4207 | tree obj_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type))); |
9771b263 DN |
4208 | vec<constructor_elt, va_gc> *v; |
4209 | vec_alloc (v, 2); | |
a1ab4c31 AC |
4210 | |
4211 | /* If the source already has a template, get a reference to the | |
4212 | associated array only, as we are going to rebuild a template | |
4213 | for the target type anyway. */ | |
4214 | expr = maybe_unconstrained_array (expr); | |
4215 | ||
0e228dd9 NF |
4216 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
4217 | build_template (TREE_TYPE (TYPE_FIELDS (type)), | |
4218 | obj_type, NULL_TREE)); | |
73a1a803 EB |
4219 | if (expr) |
4220 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), | |
4221 | convert (obj_type, expr)); | |
0e228dd9 | 4222 | return gnat_build_constructor (type, v); |
a1ab4c31 AC |
4223 | } |
4224 | ||
a1c7d797 | 4225 | /* There are some cases of expressions that we process specially. */ |
a1ab4c31 AC |
4226 | switch (TREE_CODE (expr)) |
4227 | { | |
4228 | case ERROR_MARK: | |
4229 | return expr; | |
4230 | ||
4231 | case NULL_EXPR: | |
4232 | /* Just set its type here. For TRANSFORM_EXPR, we will do the actual | |
4233 | conversion in gnat_expand_expr. NULL_EXPR does not represent | |
4234 | and actual value, so no conversion is needed. */ | |
4235 | expr = copy_node (expr); | |
4236 | TREE_TYPE (expr) = type; | |
4237 | return expr; | |
4238 | ||
4239 | case STRING_CST: | |
4240 | /* If we are converting a STRING_CST to another constrained array type, | |
4241 | just make a new one in the proper type. */ | |
4242 | if (code == ecode && AGGREGATE_TYPE_P (etype) | |
4243 | && !(TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST | |
4244 | && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)) | |
4245 | { | |
4246 | expr = copy_node (expr); | |
4247 | TREE_TYPE (expr) = type; | |
4248 | return expr; | |
4249 | } | |
4250 | break; | |
4251 | ||
7948ae37 | 4252 | case VECTOR_CST: |
44e9e3ec | 4253 | /* If we are converting a VECTOR_CST to a mere type variant, just make |
7948ae37 OH |
4254 | a new one in the proper type. */ |
4255 | if (code == ecode && gnat_types_compatible_p (type, etype)) | |
4256 | { | |
4257 | expr = copy_node (expr); | |
4258 | TREE_TYPE (expr) = type; | |
4259 | return expr; | |
4260 | } | |
4261 | ||
a1ab4c31 | 4262 | case CONSTRUCTOR: |
44e9e3ec EB |
4263 | /* If we are converting a CONSTRUCTOR to a mere type variant, or to |
4264 | another padding type around the same type, just make a new one in | |
4265 | the proper type. */ | |
4266 | if (code == ecode | |
4267 | && (gnat_types_compatible_p (type, etype) | |
4268 | || (code == RECORD_TYPE | |
4269 | && TYPE_PADDING_P (type) && TYPE_PADDING_P (etype) | |
4270 | && TREE_TYPE (TYPE_FIELDS (type)) | |
4271 | == TREE_TYPE (TYPE_FIELDS (etype))))) | |
a1ab4c31 AC |
4272 | { |
4273 | expr = copy_node (expr); | |
4274 | TREE_TYPE (expr) = type; | |
9771b263 | 4275 | CONSTRUCTOR_ELTS (expr) = vec_safe_copy (CONSTRUCTOR_ELTS (expr)); |
a1ab4c31 AC |
4276 | return expr; |
4277 | } | |
4278 | ||
cb3d597d EB |
4279 | /* Likewise for a conversion between original and packable version, or |
4280 | conversion between types of the same size and with the same list of | |
4281 | fields, but we have to work harder to preserve type consistency. */ | |
a1ab4c31 AC |
4282 | if (code == ecode |
4283 | && code == RECORD_TYPE | |
cb3d597d EB |
4284 | && (TYPE_NAME (type) == TYPE_NAME (etype) |
4285 | || tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (etype)))) | |
4286 | ||
a1ab4c31 | 4287 | { |
9771b263 DN |
4288 | vec<constructor_elt, va_gc> *e = CONSTRUCTOR_ELTS (expr); |
4289 | unsigned HOST_WIDE_INT len = vec_safe_length (e); | |
4290 | vec<constructor_elt, va_gc> *v; | |
4291 | vec_alloc (v, len); | |
a1ab4c31 AC |
4292 | tree efield = TYPE_FIELDS (etype), field = TYPE_FIELDS (type); |
4293 | unsigned HOST_WIDE_INT idx; | |
4294 | tree index, value; | |
4295 | ||
db868e1e OH |
4296 | /* Whether we need to clear TREE_CONSTANT et al. on the output |
4297 | constructor when we convert in place. */ | |
4298 | bool clear_constant = false; | |
4299 | ||
a1ab4c31 AC |
4300 | FOR_EACH_CONSTRUCTOR_ELT(e, idx, index, value) |
4301 | { | |
44e9e3ec EB |
4302 | /* Skip the missing fields in the CONSTRUCTOR. */ |
4303 | while (efield && field && !SAME_FIELD_P (efield, index)) | |
4304 | { | |
4305 | efield = DECL_CHAIN (efield); | |
4306 | field = DECL_CHAIN (field); | |
4307 | } | |
cb3d597d | 4308 | /* The field must be the same. */ |
44e9e3ec | 4309 | if (!(efield && field && SAME_FIELD_P (efield, field))) |
a1ab4c31 | 4310 | break; |
44e9e3ec EB |
4311 | constructor_elt elt |
4312 | = {field, convert (TREE_TYPE (field), value)}; | |
9771b263 | 4313 | v->quick_push (elt); |
db868e1e OH |
4314 | |
4315 | /* If packing has made this field a bitfield and the input | |
4316 | value couldn't be emitted statically any more, we need to | |
4317 | clear TREE_CONSTANT on our output. */ | |
ced57283 EB |
4318 | if (!clear_constant |
4319 | && TREE_CONSTANT (expr) | |
db868e1e OH |
4320 | && !CONSTRUCTOR_BITFIELD_P (efield) |
4321 | && CONSTRUCTOR_BITFIELD_P (field) | |
4322 | && !initializer_constant_valid_for_bitfield_p (value)) | |
4323 | clear_constant = true; | |
4324 | ||
910ad8de NF |
4325 | efield = DECL_CHAIN (efield); |
4326 | field = DECL_CHAIN (field); | |
a1ab4c31 AC |
4327 | } |
4328 | ||
db868e1e OH |
4329 | /* If we have been able to match and convert all the input fields |
4330 | to their output type, convert in place now. We'll fallback to a | |
4331 | view conversion downstream otherwise. */ | |
a1ab4c31 AC |
4332 | if (idx == len) |
4333 | { | |
4334 | expr = copy_node (expr); | |
4335 | TREE_TYPE (expr) = type; | |
4336 | CONSTRUCTOR_ELTS (expr) = v; | |
db868e1e | 4337 | if (clear_constant) |
ced57283 | 4338 | TREE_CONSTANT (expr) = TREE_STATIC (expr) = 0; |
a1ab4c31 AC |
4339 | return expr; |
4340 | } | |
4341 | } | |
7948ae37 OH |
4342 | |
4343 | /* Likewise for a conversion between array type and vector type with a | |
4344 | compatible representative array. */ | |
4345 | else if (code == VECTOR_TYPE | |
4346 | && ecode == ARRAY_TYPE | |
4347 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), | |
4348 | etype)) | |
4349 | { | |
9771b263 DN |
4350 | vec<constructor_elt, va_gc> *e = CONSTRUCTOR_ELTS (expr); |
4351 | unsigned HOST_WIDE_INT len = vec_safe_length (e); | |
4352 | vec<constructor_elt, va_gc> *v; | |
7948ae37 OH |
4353 | unsigned HOST_WIDE_INT ix; |
4354 | tree value; | |
4355 | ||
4356 | /* Build a VECTOR_CST from a *constant* array constructor. */ | |
4357 | if (TREE_CONSTANT (expr)) | |
4358 | { | |
4359 | bool constant_p = true; | |
4360 | ||
4361 | /* Iterate through elements and check if all constructor | |
4362 | elements are *_CSTs. */ | |
4363 | FOR_EACH_CONSTRUCTOR_VALUE (e, ix, value) | |
4364 | if (!CONSTANT_CLASS_P (value)) | |
4365 | { | |
4366 | constant_p = false; | |
4367 | break; | |
4368 | } | |
4369 | ||
4370 | if (constant_p) | |
4371 | return build_vector_from_ctor (type, | |
4372 | CONSTRUCTOR_ELTS (expr)); | |
4373 | } | |
4374 | ||
4375 | /* Otherwise, build a regular vector constructor. */ | |
9771b263 | 4376 | vec_alloc (v, len); |
7948ae37 OH |
4377 | FOR_EACH_CONSTRUCTOR_VALUE (e, ix, value) |
4378 | { | |
f32682ca | 4379 | constructor_elt elt = {NULL_TREE, value}; |
9771b263 | 4380 | v->quick_push (elt); |
7948ae37 OH |
4381 | } |
4382 | expr = copy_node (expr); | |
4383 | TREE_TYPE (expr) = type; | |
4384 | CONSTRUCTOR_ELTS (expr) = v; | |
4385 | return expr; | |
4386 | } | |
a1ab4c31 AC |
4387 | break; |
4388 | ||
4389 | case UNCONSTRAINED_ARRAY_REF: | |
a1c7d797 EB |
4390 | /* First retrieve the underlying array. */ |
4391 | expr = maybe_unconstrained_array (expr); | |
4392 | etype = TREE_TYPE (expr); | |
4393 | ecode = TREE_CODE (etype); | |
4394 | break; | |
a1ab4c31 AC |
4395 | |
4396 | case VIEW_CONVERT_EXPR: | |
4397 | { | |
4398 | /* GCC 4.x is very sensitive to type consistency overall, and view | |
4399 | conversions thus are very frequent. Even though just "convert"ing | |
4400 | the inner operand to the output type is fine in most cases, it | |
4401 | might expose unexpected input/output type mismatches in special | |
4402 | circumstances so we avoid such recursive calls when we can. */ | |
4403 | tree op0 = TREE_OPERAND (expr, 0); | |
4404 | ||
4405 | /* If we are converting back to the original type, we can just | |
4406 | lift the input conversion. This is a common occurrence with | |
4407 | switches back-and-forth amongst type variants. */ | |
4408 | if (type == TREE_TYPE (op0)) | |
4409 | return op0; | |
4410 | ||
7948ae37 OH |
4411 | /* Otherwise, if we're converting between two aggregate or vector |
4412 | types, we might be allowed to substitute the VIEW_CONVERT_EXPR | |
4413 | target type in place or to just convert the inner expression. */ | |
4414 | if ((AGGREGATE_TYPE_P (type) && AGGREGATE_TYPE_P (etype)) | |
4415 | || (VECTOR_TYPE_P (type) && VECTOR_TYPE_P (etype))) | |
a1ab4c31 AC |
4416 | { |
4417 | /* If we are converting between mere variants, we can just | |
4418 | substitute the VIEW_CONVERT_EXPR in place. */ | |
4419 | if (gnat_types_compatible_p (type, etype)) | |
4420 | return build1 (VIEW_CONVERT_EXPR, type, op0); | |
4421 | ||
4422 | /* Otherwise, we may just bypass the input view conversion unless | |
4423 | one of the types is a fat pointer, which is handled by | |
4424 | specialized code below which relies on exact type matching. */ | |
315cff15 EB |
4425 | else if (!TYPE_IS_FAT_POINTER_P (type) |
4426 | && !TYPE_IS_FAT_POINTER_P (etype)) | |
a1ab4c31 AC |
4427 | return convert (type, op0); |
4428 | } | |
ad1d36ba EB |
4429 | |
4430 | break; | |
a1ab4c31 | 4431 | } |
a1ab4c31 | 4432 | |
a1ab4c31 AC |
4433 | default: |
4434 | break; | |
4435 | } | |
4436 | ||
4437 | /* Check for converting to a pointer to an unconstrained array. */ | |
315cff15 | 4438 | if (TYPE_IS_FAT_POINTER_P (type) && !TYPE_IS_FAT_POINTER_P (etype)) |
a1ab4c31 AC |
4439 | return convert_to_fat_pointer (type, expr); |
4440 | ||
7948ae37 OH |
4441 | /* If we are converting between two aggregate or vector types that are mere |
4442 | variants, just make a VIEW_CONVERT_EXPR. Likewise when we are converting | |
4443 | to a vector type from its representative array type. */ | |
4444 | else if ((code == ecode | |
4445 | && (AGGREGATE_TYPE_P (type) || VECTOR_TYPE_P (type)) | |
4446 | && gnat_types_compatible_p (type, etype)) | |
4447 | || (code == VECTOR_TYPE | |
4448 | && ecode == ARRAY_TYPE | |
4449 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), | |
4450 | etype))) | |
a1ab4c31 AC |
4451 | return build1 (VIEW_CONVERT_EXPR, type, expr); |
4452 | ||
76af763d EB |
4453 | /* If we are converting between tagged types, try to upcast properly. */ |
4454 | else if (ecode == RECORD_TYPE && code == RECORD_TYPE | |
4455 | && TYPE_ALIGN_OK (etype) && TYPE_ALIGN_OK (type)) | |
4456 | { | |
4457 | tree child_etype = etype; | |
4458 | do { | |
4459 | tree field = TYPE_FIELDS (child_etype); | |
4460 | if (DECL_NAME (field) == parent_name_id && TREE_TYPE (field) == type) | |
64235766 | 4461 | return build_component_ref (expr, field, false); |
76af763d EB |
4462 | child_etype = TREE_TYPE (field); |
4463 | } while (TREE_CODE (child_etype) == RECORD_TYPE); | |
4464 | } | |
4465 | ||
bb1f7929 EB |
4466 | /* If we are converting from a smaller form of record type back to it, just |
4467 | make a VIEW_CONVERT_EXPR. But first pad the expression to have the same | |
4468 | size on both sides. */ | |
4469 | else if (ecode == RECORD_TYPE && code == RECORD_TYPE | |
4470 | && smaller_form_type_p (etype, type)) | |
4471 | { | |
4472 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, | |
4473 | false, false, false, true), | |
4474 | expr); | |
4475 | return build1 (VIEW_CONVERT_EXPR, type, expr); | |
4476 | } | |
4477 | ||
a1ab4c31 | 4478 | /* In all other cases of related types, make a NOP_EXPR. */ |
86060344 | 4479 | else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (etype)) |
a1ab4c31 AC |
4480 | return fold_convert (type, expr); |
4481 | ||
4482 | switch (code) | |
4483 | { | |
4484 | case VOID_TYPE: | |
4485 | return fold_build1 (CONVERT_EXPR, type, expr); | |
4486 | ||
a1ab4c31 AC |
4487 | case INTEGER_TYPE: |
4488 | if (TYPE_HAS_ACTUAL_BOUNDS_P (type) | |
4489 | && (ecode == ARRAY_TYPE || ecode == UNCONSTRAINED_ARRAY_TYPE | |
4490 | || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype)))) | |
4491 | return unchecked_convert (type, expr, false); | |
4492 | else if (TYPE_BIASED_REPRESENTATION_P (type)) | |
4493 | return fold_convert (type, | |
4494 | fold_build2 (MINUS_EXPR, TREE_TYPE (type), | |
4495 | convert (TREE_TYPE (type), expr), | |
1eb58520 AC |
4496 | convert (TREE_TYPE (type), |
4497 | TYPE_MIN_VALUE (type)))); | |
a1ab4c31 AC |
4498 | |
4499 | /* ... fall through ... */ | |
4500 | ||
4501 | case ENUMERAL_TYPE: | |
01ddebf2 | 4502 | case BOOLEAN_TYPE: |
a1ab4c31 AC |
4503 | /* If we are converting an additive expression to an integer type |
4504 | with lower precision, be wary of the optimization that can be | |
4505 | applied by convert_to_integer. There are 2 problematic cases: | |
4506 | - if the first operand was originally of a biased type, | |
4507 | because we could be recursively called to convert it | |
4508 | to an intermediate type and thus rematerialize the | |
4509 | additive operator endlessly, | |
4510 | - if the expression contains a placeholder, because an | |
4511 | intermediate conversion that changes the sign could | |
4512 | be inserted and thus introduce an artificial overflow | |
4513 | at compile time when the placeholder is substituted. */ | |
4514 | if (code == INTEGER_TYPE | |
4515 | && ecode == INTEGER_TYPE | |
4516 | && TYPE_PRECISION (type) < TYPE_PRECISION (etype) | |
4517 | && (TREE_CODE (expr) == PLUS_EXPR || TREE_CODE (expr) == MINUS_EXPR)) | |
4518 | { | |
4519 | tree op0 = get_unwidened (TREE_OPERAND (expr, 0), type); | |
4520 | ||
4521 | if ((TREE_CODE (TREE_TYPE (op0)) == INTEGER_TYPE | |
4522 | && TYPE_BIASED_REPRESENTATION_P (TREE_TYPE (op0))) | |
4523 | || CONTAINS_PLACEHOLDER_P (expr)) | |
4524 | return build1 (NOP_EXPR, type, expr); | |
4525 | } | |
4526 | ||
4527 | return fold (convert_to_integer (type, expr)); | |
4528 | ||
4529 | case POINTER_TYPE: | |
4530 | case REFERENCE_TYPE: | |
0d7de0e1 | 4531 | /* If converting between two thin pointers, adjust if needed to account |
2b45154d EB |
4532 | for differing offsets from the base pointer, depending on whether |
4533 | there is a TYPE_UNCONSTRAINED_ARRAY attached to the record type. */ | |
315cff15 | 4534 | if (TYPE_IS_THIN_POINTER_P (etype) && TYPE_IS_THIN_POINTER_P (type)) |
a1ab4c31 | 4535 | { |
2b45154d | 4536 | tree etype_pos |
7c775aca | 4537 | = TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (etype)) |
2b45154d EB |
4538 | ? byte_position (DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (etype)))) |
4539 | : size_zero_node; | |
4540 | tree type_pos | |
7c775aca | 4541 | = TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)) |
2b45154d EB |
4542 | ? byte_position (DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (type)))) |
4543 | : size_zero_node; | |
4544 | tree byte_diff = size_diffop (type_pos, etype_pos); | |
0d7de0e1 | 4545 | |
a1ab4c31 | 4546 | expr = build1 (NOP_EXPR, type, expr); |
a1ab4c31 AC |
4547 | if (integer_zerop (byte_diff)) |
4548 | return expr; | |
4549 | ||
4550 | return build_binary_op (POINTER_PLUS_EXPR, type, expr, | |
0d7de0e1 | 4551 | fold_convert (sizetype, byte_diff)); |
a1ab4c31 AC |
4552 | } |
4553 | ||
0d7de0e1 EB |
4554 | /* If converting fat pointer to normal or thin pointer, get the pointer |
4555 | to the array and then convert it. */ | |
4556 | if (TYPE_IS_FAT_POINTER_P (etype)) | |
64235766 | 4557 | expr = build_component_ref (expr, TYPE_FIELDS (etype), false); |
a1ab4c31 AC |
4558 | |
4559 | return fold (convert_to_pointer (type, expr)); | |
4560 | ||
4561 | case REAL_TYPE: | |
4562 | return fold (convert_to_real (type, expr)); | |
4563 | ||
4564 | case RECORD_TYPE: | |
4565 | if (TYPE_JUSTIFIED_MODULAR_P (type) && !AGGREGATE_TYPE_P (etype)) | |
0e228dd9 | 4566 | { |
9771b263 DN |
4567 | vec<constructor_elt, va_gc> *v; |
4568 | vec_alloc (v, 1); | |
0e228dd9 NF |
4569 | |
4570 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), | |
4571 | convert (TREE_TYPE (TYPE_FIELDS (type)), | |
4572 | expr)); | |
4573 | return gnat_build_constructor (type, v); | |
4574 | } | |
a1ab4c31 AC |
4575 | |
4576 | /* ... fall through ... */ | |
4577 | ||
4578 | case ARRAY_TYPE: | |
4579 | /* In these cases, assume the front-end has validated the conversion. | |
4580 | If the conversion is valid, it will be a bit-wise conversion, so | |
4581 | it can be viewed as an unchecked conversion. */ | |
4582 | return unchecked_convert (type, expr, false); | |
4583 | ||
4584 | case UNION_TYPE: | |
4585 | /* This is a either a conversion between a tagged type and some | |
4586 | subtype, which we have to mark as a UNION_TYPE because of | |
4587 | overlapping fields or a conversion of an Unchecked_Union. */ | |
4588 | return unchecked_convert (type, expr, false); | |
4589 | ||
4590 | case UNCONSTRAINED_ARRAY_TYPE: | |
7948ae37 OH |
4591 | /* If the input is a VECTOR_TYPE, convert to the representative |
4592 | array type first. */ | |
4593 | if (ecode == VECTOR_TYPE) | |
4594 | { | |
4595 | expr = convert (TYPE_REPRESENTATIVE_ARRAY (etype), expr); | |
4596 | etype = TREE_TYPE (expr); | |
4597 | ecode = TREE_CODE (etype); | |
4598 | } | |
4599 | ||
a1ab4c31 AC |
4600 | /* If EXPR is a constrained array, take its address, convert it to a |
4601 | fat pointer, and then dereference it. Likewise if EXPR is a | |
4602 | record containing both a template and a constrained array. | |
4603 | Note that a record representing a justified modular type | |
4604 | always represents a packed constrained array. */ | |
4605 | if (ecode == ARRAY_TYPE | |
4606 | || (ecode == INTEGER_TYPE && TYPE_HAS_ACTUAL_BOUNDS_P (etype)) | |
4607 | || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype)) | |
4608 | || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype))) | |
4609 | return | |
4610 | build_unary_op | |
4611 | (INDIRECT_REF, NULL_TREE, | |
4612 | convert_to_fat_pointer (TREE_TYPE (type), | |
4613 | build_unary_op (ADDR_EXPR, | |
4614 | NULL_TREE, expr))); | |
4615 | ||
4616 | /* Do something very similar for converting one unconstrained | |
4617 | array to another. */ | |
4618 | else if (ecode == UNCONSTRAINED_ARRAY_TYPE) | |
4619 | return | |
4620 | build_unary_op (INDIRECT_REF, NULL_TREE, | |
4621 | convert (TREE_TYPE (type), | |
4622 | build_unary_op (ADDR_EXPR, | |
4623 | NULL_TREE, expr))); | |
4624 | else | |
4625 | gcc_unreachable (); | |
4626 | ||
4627 | case COMPLEX_TYPE: | |
4628 | return fold (convert_to_complex (type, expr)); | |
4629 | ||
4630 | default: | |
4631 | gcc_unreachable (); | |
4632 | } | |
4633 | } | |
15bf7d19 EB |
4634 | |
4635 | /* Create an expression whose value is that of EXPR converted to the common | |
4636 | index type, which is sizetype. EXPR is supposed to be in the base type | |
4637 | of the GNAT index type. Calling it is equivalent to doing | |
4638 | ||
4639 | convert (sizetype, expr) | |
4640 | ||
4641 | but we try to distribute the type conversion with the knowledge that EXPR | |
4642 | cannot overflow in its type. This is a best-effort approach and we fall | |
4643 | back to the above expression as soon as difficulties are encountered. | |
4644 | ||
4645 | This is necessary to overcome issues that arise when the GNAT base index | |
4646 | type and the GCC common index type (sizetype) don't have the same size, | |
4647 | which is quite frequent on 64-bit architectures. In this case, and if | |
4648 | the GNAT base index type is signed but the iteration type of the loop has | |
4649 | been forced to unsigned, the loop scalar evolution engine cannot compute | |
4650 | a simple evolution for the general induction variables associated with the | |
4651 | array indices, because it will preserve the wrap-around semantics in the | |
4652 | unsigned type of their "inner" part. As a result, many loop optimizations | |
4653 | are blocked. | |
4654 | ||
4655 | The solution is to use a special (basic) induction variable that is at | |
4656 | least as large as sizetype, and to express the aforementioned general | |
4657 | induction variables in terms of this induction variable, eliminating | |
4658 | the problematic intermediate truncation to the GNAT base index type. | |
4659 | This is possible as long as the original expression doesn't overflow | |
4660 | and if the middle-end hasn't introduced artificial overflows in the | |
4661 | course of the various simplification it can make to the expression. */ | |
4662 | ||
4663 | tree | |
4664 | convert_to_index_type (tree expr) | |
4665 | { | |
4666 | enum tree_code code = TREE_CODE (expr); | |
4667 | tree type = TREE_TYPE (expr); | |
4668 | ||
4669 | /* If the type is unsigned, overflow is allowed so we cannot be sure that | |
4670 | EXPR doesn't overflow. Keep it simple if optimization is disabled. */ | |
4671 | if (TYPE_UNSIGNED (type) || !optimize) | |
4672 | return convert (sizetype, expr); | |
4673 | ||
4674 | switch (code) | |
4675 | { | |
4676 | case VAR_DECL: | |
4677 | /* The main effect of the function: replace a loop parameter with its | |
4678 | associated special induction variable. */ | |
4679 | if (DECL_LOOP_PARM_P (expr) && DECL_INDUCTION_VAR (expr)) | |
4680 | expr = DECL_INDUCTION_VAR (expr); | |
4681 | break; | |
4682 | ||
4683 | CASE_CONVERT: | |
4684 | { | |
4685 | tree otype = TREE_TYPE (TREE_OPERAND (expr, 0)); | |
4686 | /* Bail out as soon as we suspect some sort of type frobbing. */ | |
4687 | if (TYPE_PRECISION (type) != TYPE_PRECISION (otype) | |
4688 | || TYPE_UNSIGNED (type) != TYPE_UNSIGNED (otype)) | |
4689 | break; | |
4690 | } | |
4691 | ||
4692 | /* ... fall through ... */ | |
4693 | ||
4694 | case NON_LVALUE_EXPR: | |
4695 | return fold_build1 (code, sizetype, | |
4696 | convert_to_index_type (TREE_OPERAND (expr, 0))); | |
4697 | ||
4698 | case PLUS_EXPR: | |
4699 | case MINUS_EXPR: | |
4700 | case MULT_EXPR: | |
4701 | return fold_build2 (code, sizetype, | |
4702 | convert_to_index_type (TREE_OPERAND (expr, 0)), | |
4703 | convert_to_index_type (TREE_OPERAND (expr, 1))); | |
4704 | ||
4705 | case COMPOUND_EXPR: | |
4706 | return fold_build2 (code, sizetype, TREE_OPERAND (expr, 0), | |
4707 | convert_to_index_type (TREE_OPERAND (expr, 1))); | |
4708 | ||
4709 | case COND_EXPR: | |
4710 | return fold_build3 (code, sizetype, TREE_OPERAND (expr, 0), | |
4711 | convert_to_index_type (TREE_OPERAND (expr, 1)), | |
4712 | convert_to_index_type (TREE_OPERAND (expr, 2))); | |
4713 | ||
4714 | default: | |
4715 | break; | |
4716 | } | |
4717 | ||
4718 | return convert (sizetype, expr); | |
4719 | } | |
a1ab4c31 AC |
4720 | \f |
4721 | /* Remove all conversions that are done in EXP. This includes converting | |
4722 | from a padded type or to a justified modular type. If TRUE_ADDRESS | |
4723 | is true, always return the address of the containing object even if | |
4724 | the address is not bit-aligned. */ | |
4725 | ||
4726 | tree | |
4727 | remove_conversions (tree exp, bool true_address) | |
4728 | { | |
4729 | switch (TREE_CODE (exp)) | |
4730 | { | |
4731 | case CONSTRUCTOR: | |
4732 | if (true_address | |
4733 | && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
4734 | && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (exp))) | |
4735 | return | |
2117b9bb | 4736 | remove_conversions (CONSTRUCTOR_ELT (exp, 0)->value, true); |
a1ab4c31 AC |
4737 | break; |
4738 | ||
4739 | case COMPONENT_REF: | |
315cff15 | 4740 | if (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
a1ab4c31 AC |
4741 | return remove_conversions (TREE_OPERAND (exp, 0), true_address); |
4742 | break; | |
4743 | ||
a1ab4c31 | 4744 | CASE_CONVERT: |
722356ce EB |
4745 | case VIEW_CONVERT_EXPR: |
4746 | case NON_LVALUE_EXPR: | |
a1ab4c31 AC |
4747 | return remove_conversions (TREE_OPERAND (exp, 0), true_address); |
4748 | ||
4749 | default: | |
4750 | break; | |
4751 | } | |
4752 | ||
4753 | return exp; | |
4754 | } | |
4755 | \f | |
4756 | /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that | |
86060344 | 4757 | refers to the underlying array. If it has TYPE_CONTAINS_TEMPLATE_P, |
a1ab4c31 AC |
4758 | likewise return an expression pointing to the underlying array. */ |
4759 | ||
4760 | tree | |
4761 | maybe_unconstrained_array (tree exp) | |
4762 | { | |
4763 | enum tree_code code = TREE_CODE (exp); | |
1aa291f7 | 4764 | tree type = TREE_TYPE (exp); |
a1ab4c31 | 4765 | |
1aa291f7 | 4766 | switch (TREE_CODE (type)) |
a1ab4c31 AC |
4767 | { |
4768 | case UNCONSTRAINED_ARRAY_TYPE: | |
4769 | if (code == UNCONSTRAINED_ARRAY_REF) | |
4770 | { | |
7e169899 | 4771 | const bool read_only = TREE_READONLY (exp); |
a1c7d797 EB |
4772 | const bool no_trap = TREE_THIS_NOTRAP (exp); |
4773 | ||
7e169899 | 4774 | exp = TREE_OPERAND (exp, 0); |
1aa291f7 EB |
4775 | type = TREE_TYPE (exp); |
4776 | ||
7e169899 EB |
4777 | if (TREE_CODE (exp) == COND_EXPR) |
4778 | { | |
4779 | tree op1 | |
4780 | = build_unary_op (INDIRECT_REF, NULL_TREE, | |
4781 | build_component_ref (TREE_OPERAND (exp, 1), | |
1aa291f7 | 4782 | TYPE_FIELDS (type), |
7e169899 EB |
4783 | false)); |
4784 | tree op2 | |
4785 | = build_unary_op (INDIRECT_REF, NULL_TREE, | |
4786 | build_component_ref (TREE_OPERAND (exp, 2), | |
1aa291f7 | 4787 | TYPE_FIELDS (type), |
7e169899 EB |
4788 | false)); |
4789 | ||
4790 | exp = build3 (COND_EXPR, | |
1aa291f7 | 4791 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS (type))), |
7e169899 EB |
4792 | TREE_OPERAND (exp, 0), op1, op2); |
4793 | } | |
4794 | else | |
a1c7d797 EB |
4795 | { |
4796 | exp = build_unary_op (INDIRECT_REF, NULL_TREE, | |
64235766 EB |
4797 | build_component_ref (exp, |
4798 | TYPE_FIELDS (type), | |
a1c7d797 EB |
4799 | false)); |
4800 | TREE_READONLY (exp) = read_only; | |
4801 | TREE_THIS_NOTRAP (exp) = no_trap; | |
4802 | } | |
a1ab4c31 AC |
4803 | } |
4804 | ||
4805 | else if (code == NULL_EXPR) | |
1aa291f7 EB |
4806 | exp = build1 (NULL_EXPR, |
4807 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))), | |
4808 | TREE_OPERAND (exp, 0)); | |
4809 | break; | |
a1ab4c31 AC |
4810 | |
4811 | case RECORD_TYPE: | |
1aa291f7 EB |
4812 | /* If this is a padded type and it contains a template, convert to the |
4813 | unpadded type first. */ | |
4814 | if (TYPE_PADDING_P (type) | |
4815 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == RECORD_TYPE | |
4816 | && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (TYPE_FIELDS (type)))) | |
a1ab4c31 | 4817 | { |
1aa291f7 | 4818 | exp = convert (TREE_TYPE (TYPE_FIELDS (type)), exp); |
64235766 | 4819 | code = TREE_CODE (exp); |
1aa291f7 EB |
4820 | type = TREE_TYPE (exp); |
4821 | } | |
4822 | ||
4823 | if (TYPE_CONTAINS_TEMPLATE_P (type)) | |
4824 | { | |
64235766 EB |
4825 | /* If the array initializer is a box, return NULL_TREE. */ |
4826 | if (code == CONSTRUCTOR && CONSTRUCTOR_NELTS (exp) < 2) | |
4827 | return NULL_TREE; | |
4828 | ||
4829 | exp = build_component_ref (exp, DECL_CHAIN (TYPE_FIELDS (type)), | |
4830 | false); | |
4831 | type = TREE_TYPE (exp); | |
1aa291f7 EB |
4832 | |
4833 | /* If the array type is padded, convert to the unpadded type. */ | |
64235766 EB |
4834 | if (TYPE_IS_PADDING_P (type)) |
4835 | exp = convert (TREE_TYPE (TYPE_FIELDS (type)), exp); | |
a1ab4c31 | 4836 | } |
a1ab4c31 AC |
4837 | break; |
4838 | ||
4839 | default: | |
4840 | break; | |
4841 | } | |
4842 | ||
4843 | return exp; | |
4844 | } | |
4845 | \f | |
afcea859 | 4846 | /* Return true if EXPR is an expression that can be folded as an operand |
84fb43a1 | 4847 | of a VIEW_CONVERT_EXPR. See ada-tree.h for a complete rationale. */ |
afcea859 EB |
4848 | |
4849 | static bool | |
4850 | can_fold_for_view_convert_p (tree expr) | |
4851 | { | |
4852 | tree t1, t2; | |
4853 | ||
4854 | /* The folder will fold NOP_EXPRs between integral types with the same | |
4855 | precision (in the middle-end's sense). We cannot allow it if the | |
4856 | types don't have the same precision in the Ada sense as well. */ | |
4857 | if (TREE_CODE (expr) != NOP_EXPR) | |
4858 | return true; | |
4859 | ||
4860 | t1 = TREE_TYPE (expr); | |
4861 | t2 = TREE_TYPE (TREE_OPERAND (expr, 0)); | |
4862 | ||
4863 | /* Defer to the folder for non-integral conversions. */ | |
4864 | if (!(INTEGRAL_TYPE_P (t1) && INTEGRAL_TYPE_P (t2))) | |
4865 | return true; | |
4866 | ||
4867 | /* Only fold conversions that preserve both precisions. */ | |
4868 | if (TYPE_PRECISION (t1) == TYPE_PRECISION (t2) | |
4869 | && operand_equal_p (rm_size (t1), rm_size (t2), 0)) | |
4870 | return true; | |
4871 | ||
4872 | return false; | |
4873 | } | |
4874 | ||
a1ab4c31 | 4875 | /* Return an expression that does an unchecked conversion of EXPR to TYPE. |
afcea859 EB |
4876 | If NOTRUNC_P is true, truncation operations should be suppressed. |
4877 | ||
4878 | Special care is required with (source or target) integral types whose | |
4879 | precision is not equal to their size, to make sure we fetch or assign | |
4880 | the value bits whose location might depend on the endianness, e.g. | |
4881 | ||
4882 | Rmsize : constant := 8; | |
4883 | subtype Int is Integer range 0 .. 2 ** Rmsize - 1; | |
4884 | ||
4885 | type Bit_Array is array (1 .. Rmsize) of Boolean; | |
4886 | pragma Pack (Bit_Array); | |
4887 | ||
4888 | function To_Bit_Array is new Unchecked_Conversion (Int, Bit_Array); | |
4889 | ||
4890 | Value : Int := 2#1000_0001#; | |
4891 | Vbits : Bit_Array := To_Bit_Array (Value); | |
4892 | ||
4893 | we expect the 8 bits at Vbits'Address to always contain Value, while | |
4894 | their original location depends on the endianness, at Value'Address | |
84fb43a1 | 4895 | on a little-endian architecture but not on a big-endian one. */ |
a1ab4c31 AC |
4896 | |
4897 | tree | |
4898 | unchecked_convert (tree type, tree expr, bool notrunc_p) | |
4899 | { | |
4900 | tree etype = TREE_TYPE (expr); | |
c34f3839 EB |
4901 | enum tree_code ecode = TREE_CODE (etype); |
4902 | enum tree_code code = TREE_CODE (type); | |
e63b36bd | 4903 | tree tem; |
980a0501 | 4904 | int c; |
a1ab4c31 | 4905 | |
c34f3839 | 4906 | /* If the expression is already of the right type, we are done. */ |
a1ab4c31 AC |
4907 | if (etype == type) |
4908 | return expr; | |
4909 | ||
026c3cfd | 4910 | /* If both types are integral just do a normal conversion. |
a1ab4c31 | 4911 | Likewise for a conversion to an unconstrained array. */ |
1eb58520 | 4912 | if (((INTEGRAL_TYPE_P (type) |
0d7de0e1 | 4913 | || (POINTER_TYPE_P (type) && !TYPE_IS_THIN_POINTER_P (type)) |
c34f3839 | 4914 | || (code == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (type))) |
1eb58520 | 4915 | && (INTEGRAL_TYPE_P (etype) |
315cff15 | 4916 | || (POINTER_TYPE_P (etype) && !TYPE_IS_THIN_POINTER_P (etype)) |
c34f3839 EB |
4917 | || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype)))) |
4918 | || code == UNCONSTRAINED_ARRAY_TYPE) | |
a1ab4c31 | 4919 | { |
c34f3839 | 4920 | if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype)) |
a1ab4c31 AC |
4921 | { |
4922 | tree ntype = copy_type (etype); | |
a1ab4c31 AC |
4923 | TYPE_BIASED_REPRESENTATION_P (ntype) = 0; |
4924 | TYPE_MAIN_VARIANT (ntype) = ntype; | |
4925 | expr = build1 (NOP_EXPR, ntype, expr); | |
4926 | } | |
4927 | ||
c34f3839 | 4928 | if (code == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (type)) |
a1ab4c31 | 4929 | { |
afcea859 | 4930 | tree rtype = copy_type (type); |
a1ab4c31 AC |
4931 | TYPE_BIASED_REPRESENTATION_P (rtype) = 0; |
4932 | TYPE_MAIN_VARIANT (rtype) = rtype; | |
afcea859 EB |
4933 | expr = convert (rtype, expr); |
4934 | expr = build1 (NOP_EXPR, type, expr); | |
a1ab4c31 | 4935 | } |
afcea859 EB |
4936 | else |
4937 | expr = convert (type, expr); | |
a1ab4c31 AC |
4938 | } |
4939 | ||
afcea859 | 4940 | /* If we are converting to an integral type whose precision is not equal |
ee45a32d EB |
4941 | to its size, first unchecked convert to a record type that contains a |
4942 | field of the given precision. Then extract the result from the field. | |
4943 | ||
4944 | There is a subtlety if the source type is an aggregate type with reverse | |
4945 | storage order because its representation is not contiguous in the native | |
4946 | storage order, i.e. a direct unchecked conversion to an integral type | |
4947 | with N bits of precision cannot read the first N bits of the aggregate | |
4948 | type. To overcome it, we do an unchecked conversion to an integral type | |
4949 | with reverse storage order and return the resulting value. This also | |
4950 | ensures that the result of the unchecked conversion doesn't depend on | |
4951 | the endianness of the target machine, but only on the storage order of | |
4952 | the aggregate type. | |
4953 | ||
4954 | Finally, for the sake of consistency, we do the unchecked conversion | |
4955 | to an integral type with reverse storage order as soon as the source | |
4956 | type is an aggregate type with reverse storage order, even if there | |
4957 | are no considerations of precision or size involved. */ | |
980a0501 EB |
4958 | else if (INTEGRAL_TYPE_P (type) |
4959 | && TYPE_RM_SIZE (type) | |
9a1bdc31 EB |
4960 | && (tree_int_cst_compare (TYPE_RM_SIZE (type), |
4961 | TYPE_SIZE (type)) < 0 | |
ee45a32d EB |
4962 | || (AGGREGATE_TYPE_P (etype) |
4963 | && TYPE_REVERSE_STORAGE_ORDER (etype)))) | |
a1ab4c31 AC |
4964 | { |
4965 | tree rec_type = make_node (RECORD_TYPE); | |
416de7d5 EB |
4966 | unsigned HOST_WIDE_INT prec = TREE_INT_CST_LOW (TYPE_RM_SIZE (type)); |
4967 | tree field_type, field; | |
4968 | ||
ee45a32d EB |
4969 | if (AGGREGATE_TYPE_P (etype)) |
4970 | TYPE_REVERSE_STORAGE_ORDER (rec_type) | |
4971 | = TYPE_REVERSE_STORAGE_ORDER (etype); | |
4972 | ||
416de7d5 EB |
4973 | if (TYPE_UNSIGNED (type)) |
4974 | field_type = make_unsigned_type (prec); | |
4975 | else | |
4976 | field_type = make_signed_type (prec); | |
4977 | SET_TYPE_RM_SIZE (field_type, TYPE_RM_SIZE (type)); | |
4978 | ||
4979 | field = create_field_decl (get_identifier ("OBJ"), field_type, rec_type, | |
44e9e3ec | 4980 | NULL_TREE, bitsize_zero_node, 1, 0); |
a1ab4c31 | 4981 | |
44e9e3ec | 4982 | finish_record_type (rec_type, field, 1, false); |
a1ab4c31 AC |
4983 | |
4984 | expr = unchecked_convert (rec_type, expr, notrunc_p); | |
64235766 | 4985 | expr = build_component_ref (expr, field, false); |
416de7d5 | 4986 | expr = fold_build1 (NOP_EXPR, type, expr); |
a1ab4c31 AC |
4987 | } |
4988 | ||
416de7d5 EB |
4989 | /* Similarly if we are converting from an integral type whose precision is |
4990 | not equal to its size, first copy into a field of the given precision | |
ee45a32d EB |
4991 | and unchecked convert the record type. |
4992 | ||
4993 | The same considerations as above apply if the target type is an aggregate | |
4994 | type with reverse storage order and we also proceed similarly. */ | |
980a0501 EB |
4995 | else if (INTEGRAL_TYPE_P (etype) |
4996 | && TYPE_RM_SIZE (etype) | |
9a1bdc31 EB |
4997 | && (tree_int_cst_compare (TYPE_RM_SIZE (etype), |
4998 | TYPE_SIZE (etype)) < 0 | |
ee45a32d EB |
4999 | || (AGGREGATE_TYPE_P (type) |
5000 | && TYPE_REVERSE_STORAGE_ORDER (type)))) | |
a1ab4c31 AC |
5001 | { |
5002 | tree rec_type = make_node (RECORD_TYPE); | |
416de7d5 | 5003 | unsigned HOST_WIDE_INT prec = TREE_INT_CST_LOW (TYPE_RM_SIZE (etype)); |
9771b263 DN |
5004 | vec<constructor_elt, va_gc> *v; |
5005 | vec_alloc (v, 1); | |
416de7d5 EB |
5006 | tree field_type, field; |
5007 | ||
ee45a32d EB |
5008 | if (AGGREGATE_TYPE_P (type)) |
5009 | TYPE_REVERSE_STORAGE_ORDER (rec_type) | |
5010 | = TYPE_REVERSE_STORAGE_ORDER (type); | |
5011 | ||
416de7d5 EB |
5012 | if (TYPE_UNSIGNED (etype)) |
5013 | field_type = make_unsigned_type (prec); | |
5014 | else | |
5015 | field_type = make_signed_type (prec); | |
5016 | SET_TYPE_RM_SIZE (field_type, TYPE_RM_SIZE (etype)); | |
5017 | ||
5018 | field = create_field_decl (get_identifier ("OBJ"), field_type, rec_type, | |
44e9e3ec | 5019 | NULL_TREE, bitsize_zero_node, 1, 0); |
a1ab4c31 | 5020 | |
44e9e3ec | 5021 | finish_record_type (rec_type, field, 1, false); |
a1ab4c31 | 5022 | |
416de7d5 | 5023 | expr = fold_build1 (NOP_EXPR, field_type, expr); |
0e228dd9 NF |
5024 | CONSTRUCTOR_APPEND_ELT (v, field, expr); |
5025 | expr = gnat_build_constructor (rec_type, v); | |
a1ab4c31 AC |
5026 | expr = unchecked_convert (type, expr, notrunc_p); |
5027 | } | |
5028 | ||
980a0501 EB |
5029 | /* If we are converting from a scalar type to a type with a different size, |
5030 | we need to pad to have the same size on both sides. | |
5031 | ||
5032 | ??? We cannot do it unconditionally because unchecked conversions are | |
5033 | used liberally by the front-end to implement polymorphism, e.g. in: | |
5034 | ||
5035 | S191s : constant ada__tags__addr_ptr := ada__tags__addr_ptr!(S190s); | |
5036 | return p___size__4 (p__object!(S191s.all)); | |
5037 | ||
5038 | so we skip all expressions that are references. */ | |
5039 | else if (!REFERENCE_CLASS_P (expr) | |
5040 | && !AGGREGATE_TYPE_P (etype) | |
5041 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST | |
5042 | && (c = tree_int_cst_compare (TYPE_SIZE (etype), TYPE_SIZE (type)))) | |
5043 | { | |
5044 | if (c < 0) | |
5045 | { | |
5046 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, | |
5047 | false, false, false, true), | |
5048 | expr); | |
5049 | expr = unchecked_convert (type, expr, notrunc_p); | |
5050 | } | |
5051 | else | |
5052 | { | |
5053 | tree rec_type = maybe_pad_type (type, TYPE_SIZE (etype), 0, Empty, | |
5054 | false, false, false, true); | |
5055 | expr = unchecked_convert (rec_type, expr, notrunc_p); | |
64235766 | 5056 | expr = build_component_ref (expr, TYPE_FIELDS (rec_type), false); |
980a0501 EB |
5057 | } |
5058 | } | |
5059 | ||
7948ae37 OH |
5060 | /* We have a special case when we are converting between two unconstrained |
5061 | array types. In that case, take the address, convert the fat pointer | |
5062 | types, and dereference. */ | |
c34f3839 | 5063 | else if (ecode == code && code == UNCONSTRAINED_ARRAY_TYPE) |
a1ab4c31 AC |
5064 | expr = build_unary_op (INDIRECT_REF, NULL_TREE, |
5065 | build1 (VIEW_CONVERT_EXPR, TREE_TYPE (type), | |
5066 | build_unary_op (ADDR_EXPR, NULL_TREE, | |
5067 | expr))); | |
7948ae37 OH |
5068 | |
5069 | /* Another special case is when we are converting to a vector type from its | |
5070 | representative array type; this a regular conversion. */ | |
c34f3839 EB |
5071 | else if (code == VECTOR_TYPE |
5072 | && ecode == ARRAY_TYPE | |
7948ae37 OH |
5073 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), |
5074 | etype)) | |
5075 | expr = convert (type, expr); | |
5076 | ||
e63b36bd EB |
5077 | /* And, if the array type is not the representative, we try to build an |
5078 | intermediate vector type of which the array type is the representative | |
5079 | and to do the unchecked conversion between the vector types, in order | |
5080 | to enable further simplifications in the middle-end. */ | |
5081 | else if (code == VECTOR_TYPE | |
5082 | && ecode == ARRAY_TYPE | |
5083 | && (tem = build_vector_type_for_array (etype, NULL_TREE))) | |
5084 | { | |
5085 | expr = convert (tem, expr); | |
5086 | return unchecked_convert (type, expr, notrunc_p); | |
5087 | } | |
5088 | ||
44e9e3ec EB |
5089 | /* If we are converting a CONSTRUCTOR to a more aligned RECORD_TYPE, bump |
5090 | the alignment of the CONSTRUCTOR to speed up the copy operation. */ | |
5091 | else if (TREE_CODE (expr) == CONSTRUCTOR | |
5092 | && code == RECORD_TYPE | |
5093 | && TYPE_ALIGN (etype) < TYPE_ALIGN (type)) | |
5094 | { | |
5095 | expr = convert (maybe_pad_type (etype, NULL_TREE, TYPE_ALIGN (type), | |
5096 | Empty, false, false, false, true), | |
5097 | expr); | |
5098 | return unchecked_convert (type, expr, notrunc_p); | |
5099 | } | |
5100 | ||
5101 | /* Otherwise, just build a VIEW_CONVERT_EXPR of the expression. */ | |
a1ab4c31 AC |
5102 | else |
5103 | { | |
5104 | expr = maybe_unconstrained_array (expr); | |
5105 | etype = TREE_TYPE (expr); | |
c34f3839 | 5106 | ecode = TREE_CODE (etype); |
afcea859 EB |
5107 | if (can_fold_for_view_convert_p (expr)) |
5108 | expr = fold_build1 (VIEW_CONVERT_EXPR, type, expr); | |
5109 | else | |
5110 | expr = build1 (VIEW_CONVERT_EXPR, type, expr); | |
a1ab4c31 AC |
5111 | } |
5112 | ||
afcea859 EB |
5113 | /* If the result is an integral type whose precision is not equal to its |
5114 | size, sign- or zero-extend the result. We need not do this if the input | |
5115 | is an integral type of the same precision and signedness or if the output | |
55c8849f EB |
5116 | is a biased type or if both the input and output are unsigned, or if the |
5117 | lower bound is constant and non-negative, see E_Signed_Integer_Subtype | |
5118 | case of gnat_to_gnu_entity. */ | |
a1ab4c31 | 5119 | if (!notrunc_p |
9a1bdc31 EB |
5120 | && INTEGRAL_TYPE_P (type) |
5121 | && TYPE_RM_SIZE (type) | |
5122 | && tree_int_cst_compare (TYPE_RM_SIZE (type), TYPE_SIZE (type)) < 0 | |
a1ab4c31 AC |
5123 | && !(INTEGRAL_TYPE_P (etype) |
5124 | && TYPE_UNSIGNED (type) == TYPE_UNSIGNED (etype) | |
9a1bdc31 EB |
5125 | && tree_int_cst_compare (TYPE_RM_SIZE (type), |
5126 | TYPE_RM_SIZE (etype) | |
5127 | ? TYPE_RM_SIZE (etype) | |
5128 | : TYPE_SIZE (etype)) == 0) | |
5129 | && !(code == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (type)) | |
55c8849f EB |
5130 | && !((TYPE_UNSIGNED (type) |
5131 | || (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST | |
5132 | && tree_int_cst_sgn (TYPE_MIN_VALUE (type)) >= 0)) | |
5133 | && TYPE_UNSIGNED (etype))) | |
a1ab4c31 | 5134 | { |
c34f3839 | 5135 | tree base_type |
9a1bdc31 EB |
5136 | = gnat_type_for_size (TREE_INT_CST_LOW (TYPE_SIZE (type)), |
5137 | TYPE_UNSIGNED (type)); | |
a1ab4c31 AC |
5138 | tree shift_expr |
5139 | = convert (base_type, | |
5140 | size_binop (MINUS_EXPR, | |
9a1bdc31 | 5141 | TYPE_SIZE (type), TYPE_RM_SIZE (type))); |
a1ab4c31 AC |
5142 | expr |
5143 | = convert (type, | |
5144 | build_binary_op (RSHIFT_EXPR, base_type, | |
5145 | build_binary_op (LSHIFT_EXPR, base_type, | |
5146 | convert (base_type, expr), | |
5147 | shift_expr), | |
5148 | shift_expr)); | |
5149 | } | |
5150 | ||
5151 | /* An unchecked conversion should never raise Constraint_Error. The code | |
5152 | below assumes that GCC's conversion routines overflow the same way that | |
5153 | the underlying hardware does. This is probably true. In the rare case | |
5154 | when it is false, we can rely on the fact that such conversions are | |
5155 | erroneous anyway. */ | |
5156 | if (TREE_CODE (expr) == INTEGER_CST) | |
5157 | TREE_OVERFLOW (expr) = 0; | |
5158 | ||
5159 | /* If the sizes of the types differ and this is an VIEW_CONVERT_EXPR, | |
5160 | show no longer constant. */ | |
5161 | if (TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
5162 | && !operand_equal_p (TYPE_SIZE_UNIT (type), TYPE_SIZE_UNIT (etype), | |
5163 | OEP_ONLY_CONST)) | |
5164 | TREE_CONSTANT (expr) = 0; | |
5165 | ||
5166 | return expr; | |
5167 | } | |
5168 | \f | |
feec4372 | 5169 | /* Return the appropriate GCC tree code for the specified GNAT_TYPE, |
a1ab4c31 AC |
5170 | the latter being a record type as predicated by Is_Record_Type. */ |
5171 | ||
5172 | enum tree_code | |
5173 | tree_code_for_record_type (Entity_Id gnat_type) | |
5174 | { | |
b1a785fb | 5175 | Node_Id component_list, component; |
a1ab4c31 | 5176 | |
b1a785fb EB |
5177 | /* Return UNION_TYPE if it's an Unchecked_Union whose non-discriminant |
5178 | fields are all in the variant part. Otherwise, return RECORD_TYPE. */ | |
a1ab4c31 AC |
5179 | if (!Is_Unchecked_Union (gnat_type)) |
5180 | return RECORD_TYPE; | |
5181 | ||
b1a785fb EB |
5182 | gnat_type = Implementation_Base_Type (gnat_type); |
5183 | component_list | |
5184 | = Component_List (Type_Definition (Declaration_Node (gnat_type))); | |
5185 | ||
a1ab4c31 AC |
5186 | for (component = First_Non_Pragma (Component_Items (component_list)); |
5187 | Present (component); | |
5188 | component = Next_Non_Pragma (component)) | |
5189 | if (Ekind (Defining_Entity (component)) == E_Component) | |
5190 | return RECORD_TYPE; | |
5191 | ||
5192 | return UNION_TYPE; | |
5193 | } | |
5194 | ||
caa9d12a EB |
5195 | /* Return true if GNAT_TYPE is a "double" floating-point type, i.e. whose |
5196 | size is equal to 64 bits, or an array of such a type. Set ALIGN_CLAUSE | |
5197 | according to the presence of an alignment clause on the type or, if it | |
5198 | is an array, on the component type. */ | |
5199 | ||
5200 | bool | |
5201 | is_double_float_or_array (Entity_Id gnat_type, bool *align_clause) | |
5202 | { | |
5203 | gnat_type = Underlying_Type (gnat_type); | |
5204 | ||
5205 | *align_clause = Present (Alignment_Clause (gnat_type)); | |
5206 | ||
5207 | if (Is_Array_Type (gnat_type)) | |
5208 | { | |
5209 | gnat_type = Underlying_Type (Component_Type (gnat_type)); | |
5210 | if (Present (Alignment_Clause (gnat_type))) | |
5211 | *align_clause = true; | |
5212 | } | |
5213 | ||
5214 | if (!Is_Floating_Point_Type (gnat_type)) | |
5215 | return false; | |
5216 | ||
5217 | if (UI_To_Int (Esize (gnat_type)) != 64) | |
5218 | return false; | |
5219 | ||
5220 | return true; | |
5221 | } | |
5222 | ||
5223 | /* Return true if GNAT_TYPE is a "double" or larger scalar type, i.e. whose | |
5224 | size is greater or equal to 64 bits, or an array of such a type. Set | |
5225 | ALIGN_CLAUSE according to the presence of an alignment clause on the | |
5226 | type or, if it is an array, on the component type. */ | |
5227 | ||
5228 | bool | |
5229 | is_double_scalar_or_array (Entity_Id gnat_type, bool *align_clause) | |
5230 | { | |
5231 | gnat_type = Underlying_Type (gnat_type); | |
5232 | ||
5233 | *align_clause = Present (Alignment_Clause (gnat_type)); | |
5234 | ||
5235 | if (Is_Array_Type (gnat_type)) | |
5236 | { | |
5237 | gnat_type = Underlying_Type (Component_Type (gnat_type)); | |
5238 | if (Present (Alignment_Clause (gnat_type))) | |
5239 | *align_clause = true; | |
5240 | } | |
5241 | ||
5242 | if (!Is_Scalar_Type (gnat_type)) | |
5243 | return false; | |
5244 | ||
5245 | if (UI_To_Int (Esize (gnat_type)) < 64) | |
5246 | return false; | |
5247 | ||
5248 | return true; | |
5249 | } | |
5250 | ||
a1ab4c31 AC |
5251 | /* Return true if GNU_TYPE is suitable as the type of a non-aliased |
5252 | component of an aggregate type. */ | |
5253 | ||
5254 | bool | |
5255 | type_for_nonaliased_component_p (tree gnu_type) | |
5256 | { | |
5257 | /* If the type is passed by reference, we may have pointers to the | |
5258 | component so it cannot be made non-aliased. */ | |
5259 | if (must_pass_by_ref (gnu_type) || default_pass_by_ref (gnu_type)) | |
5260 | return false; | |
5261 | ||
5262 | /* We used to say that any component of aggregate type is aliased | |
5263 | because the front-end may take 'Reference of it. The front-end | |
5264 | has been enhanced in the meantime so as to use a renaming instead | |
5265 | in most cases, but the back-end can probably take the address of | |
5266 | such a component too so we go for the conservative stance. | |
5267 | ||
5268 | For instance, we might need the address of any array type, even | |
5269 | if normally passed by copy, to construct a fat pointer if the | |
5270 | component is used as an actual for an unconstrained formal. | |
5271 | ||
5272 | Likewise for record types: even if a specific record subtype is | |
5273 | passed by copy, the parent type might be passed by ref (e.g. if | |
5274 | it's of variable size) and we might take the address of a child | |
5275 | component to pass to a parent formal. We have no way to check | |
5276 | for such conditions here. */ | |
5277 | if (AGGREGATE_TYPE_P (gnu_type)) | |
5278 | return false; | |
5279 | ||
5280 | return true; | |
5281 | } | |
5282 | ||
bb1f7929 EB |
5283 | /* Return true if TYPE is a smaller form of ORIG_TYPE. */ |
5284 | ||
5285 | bool | |
5286 | smaller_form_type_p (tree type, tree orig_type) | |
5287 | { | |
5288 | tree size, osize; | |
5289 | ||
5290 | /* We're not interested in variants here. */ | |
5291 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (orig_type)) | |
5292 | return false; | |
5293 | ||
5294 | /* Like a variant, a packable version keeps the original TYPE_NAME. */ | |
5295 | if (TYPE_NAME (type) != TYPE_NAME (orig_type)) | |
5296 | return false; | |
5297 | ||
5298 | size = TYPE_SIZE (type); | |
5299 | osize = TYPE_SIZE (orig_type); | |
5300 | ||
5301 | if (!(TREE_CODE (size) == INTEGER_CST && TREE_CODE (osize) == INTEGER_CST)) | |
5302 | return false; | |
5303 | ||
5304 | return tree_int_cst_lt (size, osize) != 0; | |
5305 | } | |
5306 | ||
a22b794d | 5307 | /* Perform final processing on global declarations. */ |
d7438551 | 5308 | |
0f50b3db EB |
5309 | static GTY (()) tree dummy_global; |
5310 | ||
a1ab4c31 | 5311 | void |
a22b794d | 5312 | gnat_write_global_declarations (void) |
a1ab4c31 | 5313 | { |
10e4d056 EB |
5314 | unsigned int i; |
5315 | tree iter; | |
5316 | ||
65444786 | 5317 | /* If we have declared types as used at the global level, insert them in |
755c71fa EB |
5318 | the global hash table. We use a dummy variable for this purpose, but |
5319 | we need to build it unconditionally to avoid -fcompare-debug issues. */ | |
5320 | if (first_global_object_name) | |
65444786 | 5321 | { |
35e8bcf4 | 5322 | struct varpool_node *node; |
d3c268ab EB |
5323 | char *label; |
5324 | ||
5325 | ASM_FORMAT_PRIVATE_NAME (label, first_global_object_name, 0); | |
65444786 | 5326 | dummy_global |
d3c268ab EB |
5327 | = build_decl (BUILTINS_LOCATION, VAR_DECL, get_identifier (label), |
5328 | void_type_node); | |
dd25fe0a | 5329 | DECL_HARD_REGISTER (dummy_global) = 1; |
65444786 | 5330 | TREE_STATIC (dummy_global) = 1; |
037e5573 | 5331 | node = varpool_node::get_create (dummy_global); |
dd25fe0a | 5332 | node->definition = 1; |
67348ccc | 5333 | node->force_output = 1; |
65444786 | 5334 | |
755c71fa EB |
5335 | if (types_used_by_cur_var_decl) |
5336 | while (!types_used_by_cur_var_decl->is_empty ()) | |
5337 | { | |
5338 | tree t = types_used_by_cur_var_decl->pop (); | |
5339 | types_used_by_var_decl_insert (t, dummy_global); | |
5340 | } | |
65444786 EB |
5341 | } |
5342 | ||
a22b794d EB |
5343 | /* Output debug information for all global type declarations first. This |
5344 | ensures that global types whose compilation hasn't been finalized yet, | |
5345 | for example pointers to Taft amendment types, have their compilation | |
5346 | finalized in the right context. */ | |
5347 | FOR_EACH_VEC_SAFE_ELT (global_decls, i, iter) | |
5348 | if (TREE_CODE (iter) == TYPE_DECL && !DECL_IGNORED_P (iter)) | |
1f0e2688 | 5349 | debug_hooks->type_decl (iter, false); |
a22b794d EB |
5350 | |
5351 | /* Then output the global variables. We need to do that after the debug | |
8afaddaa | 5352 | information for global types is emitted so that they are finalized. */ |
a22b794d EB |
5353 | FOR_EACH_VEC_SAFE_ELT (global_decls, i, iter) |
5354 | if (TREE_CODE (iter) == VAR_DECL) | |
5355 | rest_of_decl_compilation (iter, true, 0); | |
caadda8e PMR |
5356 | |
5357 | /* Output the imported modules/declarations. In GNAT, these are only | |
5358 | materializing subprogram. */ | |
5359 | FOR_EACH_VEC_SAFE_ELT (global_decls, i, iter) | |
5360 | if (TREE_CODE (iter) == IMPORTED_DECL && !DECL_IGNORED_P (iter)) | |
5361 | debug_hooks->imported_module_or_decl (iter, DECL_NAME (iter), | |
5362 | DECL_CONTEXT (iter), 0); | |
a1ab4c31 AC |
5363 | } |
5364 | ||
5365 | /* ************************************************************************ | |
5366 | * * GCC builtins support * | |
5367 | * ************************************************************************ */ | |
5368 | ||
5369 | /* The general scheme is fairly simple: | |
5370 | ||
5371 | For each builtin function/type to be declared, gnat_install_builtins calls | |
aef308d0 | 5372 | internal facilities which eventually get to gnat_pushdecl, which in turn |
a1ab4c31 AC |
5373 | tracks the so declared builtin function decls in the 'builtin_decls' global |
5374 | datastructure. When an Intrinsic subprogram declaration is processed, we | |
5375 | search this global datastructure to retrieve the associated BUILT_IN DECL | |
5376 | node. */ | |
5377 | ||
5378 | /* Search the chain of currently available builtin declarations for a node | |
5379 | corresponding to function NAME (an IDENTIFIER_NODE). Return the first node | |
5380 | found, if any, or NULL_TREE otherwise. */ | |
5381 | tree | |
5382 | builtin_decl_for (tree name) | |
5383 | { | |
5384 | unsigned i; | |
5385 | tree decl; | |
5386 | ||
9771b263 | 5387 | FOR_EACH_VEC_SAFE_ELT (builtin_decls, i, decl) |
a1ab4c31 AC |
5388 | if (DECL_NAME (decl) == name) |
5389 | return decl; | |
5390 | ||
5391 | return NULL_TREE; | |
5392 | } | |
5393 | ||
5394 | /* The code below eventually exposes gnat_install_builtins, which declares | |
5395 | the builtin types and functions we might need, either internally or as | |
5396 | user accessible facilities. | |
5397 | ||
5398 | ??? This is a first implementation shot, still in rough shape. It is | |
5399 | heavily inspired from the "C" family implementation, with chunks copied | |
5400 | verbatim from there. | |
5401 | ||
ba464315 | 5402 | Two obvious improvement candidates are: |
a1ab4c31 AC |
5403 | o Use a more efficient name/decl mapping scheme |
5404 | o Devise a middle-end infrastructure to avoid having to copy | |
5405 | pieces between front-ends. */ | |
5406 | ||
5407 | /* ----------------------------------------------------------------------- * | |
5408 | * BUILTIN ELEMENTARY TYPES * | |
5409 | * ----------------------------------------------------------------------- */ | |
5410 | ||
5411 | /* Standard data types to be used in builtin argument declarations. */ | |
5412 | ||
5413 | enum c_tree_index | |
5414 | { | |
5415 | CTI_SIGNED_SIZE_TYPE, /* For format checking only. */ | |
5416 | CTI_STRING_TYPE, | |
5417 | CTI_CONST_STRING_TYPE, | |
5418 | ||
5419 | CTI_MAX | |
5420 | }; | |
5421 | ||
5422 | static tree c_global_trees[CTI_MAX]; | |
5423 | ||
5424 | #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE] | |
5425 | #define string_type_node c_global_trees[CTI_STRING_TYPE] | |
5426 | #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE] | |
5427 | ||
5428 | /* ??? In addition some attribute handlers, we currently don't support a | |
5429 | (small) number of builtin-types, which in turns inhibits support for a | |
5430 | number of builtin functions. */ | |
5431 | #define wint_type_node void_type_node | |
5432 | #define intmax_type_node void_type_node | |
5433 | #define uintmax_type_node void_type_node | |
5434 | ||
a1ab4c31 AC |
5435 | /* Used to help initialize the builtin-types.def table. When a type of |
5436 | the correct size doesn't exist, use error_mark_node instead of NULL. | |
5437 | The later results in segfaults even when a decl using the type doesn't | |
5438 | get invoked. */ | |
5439 | ||
5440 | static tree | |
5441 | builtin_type_for_size (int size, bool unsignedp) | |
5442 | { | |
ced57283 | 5443 | tree type = gnat_type_for_size (size, unsignedp); |
a1ab4c31 AC |
5444 | return type ? type : error_mark_node; |
5445 | } | |
5446 | ||
5447 | /* Build/push the elementary type decls that builtin functions/types | |
5448 | will need. */ | |
5449 | ||
5450 | static void | |
5451 | install_builtin_elementary_types (void) | |
5452 | { | |
9a1bdc31 | 5453 | signed_size_type_node = gnat_signed_type_for (size_type_node); |
a1ab4c31 | 5454 | pid_type_node = integer_type_node; |
a1ab4c31 AC |
5455 | |
5456 | string_type_node = build_pointer_type (char_type_node); | |
5457 | const_string_type_node | |
5458 | = build_pointer_type (build_qualified_type | |
5459 | (char_type_node, TYPE_QUAL_CONST)); | |
5460 | } | |
5461 | ||
5462 | /* ----------------------------------------------------------------------- * | |
5463 | * BUILTIN FUNCTION TYPES * | |
5464 | * ----------------------------------------------------------------------- */ | |
5465 | ||
5466 | /* Now, builtin function types per se. */ | |
5467 | ||
5468 | enum c_builtin_type | |
5469 | { | |
5470 | #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, | |
5471 | #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, | |
5472 | #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, | |
5473 | #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, | |
5474 | #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
5475 | #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
5476 | #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME, | |
f6a7cffc TS |
5477 | #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
5478 | ARG6) NAME, | |
5479 | #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5480 | ARG6, ARG7) NAME, | |
5481 | #define DEF_FUNCTION_TYPE_8(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5482 | ARG6, ARG7, ARG8) NAME, | |
d9a6bd32 JJ |
5483 | #define DEF_FUNCTION_TYPE_9(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
5484 | ARG6, ARG7, ARG8, ARG9) NAME, | |
5485 | #define DEF_FUNCTION_TYPE_10(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5486 | ARG6, ARG7, ARG8, ARG9, ARG10) NAME, | |
5487 | #define DEF_FUNCTION_TYPE_11(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5488 | ARG6, ARG7, ARG8, ARG9, ARG10, ARG11) NAME, | |
a1ab4c31 AC |
5489 | #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, |
5490 | #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, | |
5491 | #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, | |
5492 | #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
5493 | #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
f6a7cffc | 5494 | #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ |
56a9f6bc | 5495 | NAME, |
3e32ee19 NS |
5496 | #define DEF_FUNCTION_TYPE_VAR_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
5497 | ARG6) NAME, | |
56a9f6bc TS |
5498 | #define DEF_FUNCTION_TYPE_VAR_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
5499 | ARG6, ARG7) NAME, | |
a1ab4c31 AC |
5500 | #define DEF_POINTER_TYPE(NAME, TYPE) NAME, |
5501 | #include "builtin-types.def" | |
5502 | #undef DEF_PRIMITIVE_TYPE | |
5503 | #undef DEF_FUNCTION_TYPE_0 | |
5504 | #undef DEF_FUNCTION_TYPE_1 | |
5505 | #undef DEF_FUNCTION_TYPE_2 | |
5506 | #undef DEF_FUNCTION_TYPE_3 | |
5507 | #undef DEF_FUNCTION_TYPE_4 | |
5508 | #undef DEF_FUNCTION_TYPE_5 | |
5509 | #undef DEF_FUNCTION_TYPE_6 | |
5510 | #undef DEF_FUNCTION_TYPE_7 | |
acf0174b | 5511 | #undef DEF_FUNCTION_TYPE_8 |
d9a6bd32 JJ |
5512 | #undef DEF_FUNCTION_TYPE_9 |
5513 | #undef DEF_FUNCTION_TYPE_10 | |
5514 | #undef DEF_FUNCTION_TYPE_11 | |
a1ab4c31 AC |
5515 | #undef DEF_FUNCTION_TYPE_VAR_0 |
5516 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
5517 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
5518 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
5519 | #undef DEF_FUNCTION_TYPE_VAR_4 | |
5520 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
3e32ee19 | 5521 | #undef DEF_FUNCTION_TYPE_VAR_6 |
56a9f6bc | 5522 | #undef DEF_FUNCTION_TYPE_VAR_7 |
a1ab4c31 AC |
5523 | #undef DEF_POINTER_TYPE |
5524 | BT_LAST | |
5525 | }; | |
5526 | ||
5527 | typedef enum c_builtin_type builtin_type; | |
5528 | ||
5529 | /* A temporary array used in communication with def_fn_type. */ | |
5530 | static GTY(()) tree builtin_types[(int) BT_LAST + 1]; | |
5531 | ||
5532 | /* A helper function for install_builtin_types. Build function type | |
5533 | for DEF with return type RET and N arguments. If VAR is true, then the | |
5534 | function should be variadic after those N arguments. | |
5535 | ||
5536 | Takes special care not to ICE if any of the types involved are | |
5537 | error_mark_node, which indicates that said type is not in fact available | |
5538 | (see builtin_type_for_size). In which case the function type as a whole | |
5539 | should be error_mark_node. */ | |
5540 | ||
5541 | static void | |
5542 | def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...) | |
5543 | { | |
e5b00edf NF |
5544 | tree t; |
5545 | tree *args = XALLOCAVEC (tree, n); | |
a1ab4c31 AC |
5546 | va_list list; |
5547 | int i; | |
5548 | ||
5549 | va_start (list, n); | |
5550 | for (i = 0; i < n; ++i) | |
5551 | { | |
c6bd4220 | 5552 | builtin_type a = (builtin_type) va_arg (list, int); |
a1ab4c31 AC |
5553 | t = builtin_types[a]; |
5554 | if (t == error_mark_node) | |
5555 | goto egress; | |
e5b00edf | 5556 | args[i] = t; |
a1ab4c31 | 5557 | } |
a1ab4c31 | 5558 | |
a1ab4c31 AC |
5559 | t = builtin_types[ret]; |
5560 | if (t == error_mark_node) | |
5561 | goto egress; | |
e5b00edf NF |
5562 | if (var) |
5563 | t = build_varargs_function_type_array (t, n, args); | |
5564 | else | |
5565 | t = build_function_type_array (t, n, args); | |
a1ab4c31 AC |
5566 | |
5567 | egress: | |
5568 | builtin_types[def] = t; | |
0edf1bb2 | 5569 | va_end (list); |
a1ab4c31 AC |
5570 | } |
5571 | ||
5572 | /* Build the builtin function types and install them in the builtin_types | |
5573 | array for later use in builtin function decls. */ | |
5574 | ||
5575 | static void | |
5576 | install_builtin_function_types (void) | |
5577 | { | |
5578 | tree va_list_ref_type_node; | |
5579 | tree va_list_arg_type_node; | |
5580 | ||
5581 | if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) | |
5582 | { | |
5583 | va_list_arg_type_node = va_list_ref_type_node = | |
5584 | build_pointer_type (TREE_TYPE (va_list_type_node)); | |
5585 | } | |
5586 | else | |
5587 | { | |
5588 | va_list_arg_type_node = va_list_type_node; | |
5589 | va_list_ref_type_node = build_reference_type (va_list_type_node); | |
5590 | } | |
5591 | ||
5592 | #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ | |
5593 | builtin_types[ENUM] = VALUE; | |
5594 | #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ | |
5595 | def_fn_type (ENUM, RETURN, 0, 0); | |
5596 | #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ | |
5597 | def_fn_type (ENUM, RETURN, 0, 1, ARG1); | |
5598 | #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ | |
5599 | def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2); | |
5600 | #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
5601 | def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3); | |
5602 | #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
5603 | def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4); | |
5604 | #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
5605 | def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
5606 | #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5607 | ARG6) \ | |
5608 | def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6); | |
5609 | #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5610 | ARG6, ARG7) \ | |
5611 | def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7); | |
acf0174b JJ |
5612 | #define DEF_FUNCTION_TYPE_8(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
5613 | ARG6, ARG7, ARG8) \ | |
5614 | def_fn_type (ENUM, RETURN, 0, 8, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, \ | |
5615 | ARG7, ARG8); | |
d9a6bd32 JJ |
5616 | #define DEF_FUNCTION_TYPE_9(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
5617 | ARG6, ARG7, ARG8, ARG9) \ | |
5618 | def_fn_type (ENUM, RETURN, 0, 9, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, \ | |
5619 | ARG7, ARG8, ARG9); | |
5620 | #define DEF_FUNCTION_TYPE_10(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5,\ | |
5621 | ARG6, ARG7, ARG8, ARG9, ARG10) \ | |
5622 | def_fn_type (ENUM, RETURN, 0, 10, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, \ | |
5623 | ARG7, ARG8, ARG9, ARG10); | |
5624 | #define DEF_FUNCTION_TYPE_11(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5,\ | |
5625 | ARG6, ARG7, ARG8, ARG9, ARG10, ARG11) \ | |
5626 | def_fn_type (ENUM, RETURN, 0, 11, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, \ | |
5627 | ARG7, ARG8, ARG9, ARG10, ARG11); | |
a1ab4c31 AC |
5628 | #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ |
5629 | def_fn_type (ENUM, RETURN, 1, 0); | |
5630 | #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ | |
5631 | def_fn_type (ENUM, RETURN, 1, 1, ARG1); | |
5632 | #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ | |
5633 | def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2); | |
5634 | #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
5635 | def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3); | |
5636 | #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
5637 | def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4); | |
5638 | #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
5639 | def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
3e32ee19 NS |
5640 | #define DEF_FUNCTION_TYPE_VAR_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
5641 | ARG6) \ | |
5642 | def_fn_type (ENUM, RETURN, 1, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6); | |
56a9f6bc TS |
5643 | #define DEF_FUNCTION_TYPE_VAR_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
5644 | ARG6, ARG7) \ | |
5645 | def_fn_type (ENUM, RETURN, 1, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7); | |
a1ab4c31 AC |
5646 | #define DEF_POINTER_TYPE(ENUM, TYPE) \ |
5647 | builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]); | |
5648 | ||
5649 | #include "builtin-types.def" | |
5650 | ||
5651 | #undef DEF_PRIMITIVE_TYPE | |
f6a7cffc | 5652 | #undef DEF_FUNCTION_TYPE_0 |
a1ab4c31 AC |
5653 | #undef DEF_FUNCTION_TYPE_1 |
5654 | #undef DEF_FUNCTION_TYPE_2 | |
5655 | #undef DEF_FUNCTION_TYPE_3 | |
5656 | #undef DEF_FUNCTION_TYPE_4 | |
5657 | #undef DEF_FUNCTION_TYPE_5 | |
5658 | #undef DEF_FUNCTION_TYPE_6 | |
f6a7cffc TS |
5659 | #undef DEF_FUNCTION_TYPE_7 |
5660 | #undef DEF_FUNCTION_TYPE_8 | |
d9a6bd32 JJ |
5661 | #undef DEF_FUNCTION_TYPE_9 |
5662 | #undef DEF_FUNCTION_TYPE_10 | |
5663 | #undef DEF_FUNCTION_TYPE_11 | |
a1ab4c31 AC |
5664 | #undef DEF_FUNCTION_TYPE_VAR_0 |
5665 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
5666 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
5667 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
5668 | #undef DEF_FUNCTION_TYPE_VAR_4 | |
5669 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
3e32ee19 | 5670 | #undef DEF_FUNCTION_TYPE_VAR_6 |
56a9f6bc | 5671 | #undef DEF_FUNCTION_TYPE_VAR_7 |
a1ab4c31 AC |
5672 | #undef DEF_POINTER_TYPE |
5673 | builtin_types[(int) BT_LAST] = NULL_TREE; | |
5674 | } | |
5675 | ||
5676 | /* ----------------------------------------------------------------------- * | |
5677 | * BUILTIN ATTRIBUTES * | |
5678 | * ----------------------------------------------------------------------- */ | |
5679 | ||
5680 | enum built_in_attribute | |
5681 | { | |
5682 | #define DEF_ATTR_NULL_TREE(ENUM) ENUM, | |
5683 | #define DEF_ATTR_INT(ENUM, VALUE) ENUM, | |
e384e6b5 | 5684 | #define DEF_ATTR_STRING(ENUM, VALUE) ENUM, |
a1ab4c31 AC |
5685 | #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, |
5686 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, | |
5687 | #include "builtin-attrs.def" | |
5688 | #undef DEF_ATTR_NULL_TREE | |
5689 | #undef DEF_ATTR_INT | |
e384e6b5 | 5690 | #undef DEF_ATTR_STRING |
a1ab4c31 AC |
5691 | #undef DEF_ATTR_IDENT |
5692 | #undef DEF_ATTR_TREE_LIST | |
5693 | ATTR_LAST | |
5694 | }; | |
5695 | ||
5696 | static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; | |
5697 | ||
5698 | static void | |
5699 | install_builtin_attributes (void) | |
5700 | { | |
5701 | /* Fill in the built_in_attributes array. */ | |
5702 | #define DEF_ATTR_NULL_TREE(ENUM) \ | |
5703 | built_in_attributes[(int) ENUM] = NULL_TREE; | |
5704 | #define DEF_ATTR_INT(ENUM, VALUE) \ | |
5705 | built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE); | |
e384e6b5 BS |
5706 | #define DEF_ATTR_STRING(ENUM, VALUE) \ |
5707 | built_in_attributes[(int) ENUM] = build_string (strlen (VALUE), VALUE); | |
a1ab4c31 AC |
5708 | #define DEF_ATTR_IDENT(ENUM, STRING) \ |
5709 | built_in_attributes[(int) ENUM] = get_identifier (STRING); | |
5710 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ | |
5711 | built_in_attributes[(int) ENUM] \ | |
5712 | = tree_cons (built_in_attributes[(int) PURPOSE], \ | |
5713 | built_in_attributes[(int) VALUE], \ | |
5714 | built_in_attributes[(int) CHAIN]); | |
5715 | #include "builtin-attrs.def" | |
5716 | #undef DEF_ATTR_NULL_TREE | |
5717 | #undef DEF_ATTR_INT | |
e384e6b5 | 5718 | #undef DEF_ATTR_STRING |
a1ab4c31 AC |
5719 | #undef DEF_ATTR_IDENT |
5720 | #undef DEF_ATTR_TREE_LIST | |
5721 | } | |
5722 | ||
5723 | /* Handle a "const" attribute; arguments as in | |
5724 | struct attribute_spec.handler. */ | |
5725 | ||
5726 | static tree | |
5727 | handle_const_attribute (tree *node, tree ARG_UNUSED (name), | |
5728 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5729 | bool *no_add_attrs) | |
5730 | { | |
5731 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5732 | TREE_READONLY (*node) = 1; | |
5733 | else | |
5734 | *no_add_attrs = true; | |
5735 | ||
5736 | return NULL_TREE; | |
5737 | } | |
5738 | ||
5739 | /* Handle a "nothrow" attribute; arguments as in | |
5740 | struct attribute_spec.handler. */ | |
5741 | ||
5742 | static tree | |
5743 | handle_nothrow_attribute (tree *node, tree ARG_UNUSED (name), | |
5744 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5745 | bool *no_add_attrs) | |
5746 | { | |
5747 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5748 | TREE_NOTHROW (*node) = 1; | |
5749 | else | |
5750 | *no_add_attrs = true; | |
5751 | ||
5752 | return NULL_TREE; | |
5753 | } | |
5754 | ||
5755 | /* Handle a "pure" attribute; arguments as in | |
5756 | struct attribute_spec.handler. */ | |
5757 | ||
5758 | static tree | |
5759 | handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5760 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5761 | { | |
5762 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5763 | DECL_PURE_P (*node) = 1; | |
ba464315 | 5764 | /* TODO: support types. */ |
a1ab4c31 AC |
5765 | else |
5766 | { | |
7948ae37 OH |
5767 | warning (OPT_Wattributes, "%qs attribute ignored", |
5768 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
5769 | *no_add_attrs = true; |
5770 | } | |
5771 | ||
5772 | return NULL_TREE; | |
5773 | } | |
5774 | ||
5775 | /* Handle a "no vops" attribute; arguments as in | |
5776 | struct attribute_spec.handler. */ | |
5777 | ||
5778 | static tree | |
5779 | handle_novops_attribute (tree *node, tree ARG_UNUSED (name), | |
5780 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5781 | bool *ARG_UNUSED (no_add_attrs)) | |
5782 | { | |
5783 | gcc_assert (TREE_CODE (*node) == FUNCTION_DECL); | |
5784 | DECL_IS_NOVOPS (*node) = 1; | |
5785 | return NULL_TREE; | |
5786 | } | |
5787 | ||
5788 | /* Helper for nonnull attribute handling; fetch the operand number | |
5789 | from the attribute argument list. */ | |
5790 | ||
5791 | static bool | |
5792 | get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) | |
5793 | { | |
5794 | /* Verify the arg number is a constant. */ | |
807e902e | 5795 | if (!tree_fits_uhwi_p (arg_num_expr)) |
a1ab4c31 AC |
5796 | return false; |
5797 | ||
5798 | *valp = TREE_INT_CST_LOW (arg_num_expr); | |
5799 | return true; | |
5800 | } | |
5801 | ||
5802 | /* Handle the "nonnull" attribute. */ | |
5803 | static tree | |
5804 | handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name), | |
5805 | tree args, int ARG_UNUSED (flags), | |
5806 | bool *no_add_attrs) | |
5807 | { | |
5808 | tree type = *node; | |
5809 | unsigned HOST_WIDE_INT attr_arg_num; | |
5810 | ||
5811 | /* If no arguments are specified, all pointer arguments should be | |
5812 | non-null. Verify a full prototype is given so that the arguments | |
4d926e34 MS |
5813 | will have the correct types when we actually check them later. |
5814 | Avoid diagnosing type-generic built-ins since those have no | |
5815 | prototype. */ | |
a1ab4c31 AC |
5816 | if (!args) |
5817 | { | |
4d926e34 MS |
5818 | if (!prototype_p (type) |
5819 | && (!TYPE_ATTRIBUTES (type) | |
5820 | || !lookup_attribute ("type generic", TYPE_ATTRIBUTES (type)))) | |
a1ab4c31 AC |
5821 | { |
5822 | error ("nonnull attribute without arguments on a non-prototype"); | |
5823 | *no_add_attrs = true; | |
5824 | } | |
5825 | return NULL_TREE; | |
5826 | } | |
5827 | ||
5828 | /* Argument list specified. Verify that each argument number references | |
5829 | a pointer argument. */ | |
5830 | for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) | |
5831 | { | |
a1ab4c31 AC |
5832 | unsigned HOST_WIDE_INT arg_num = 0, ck_num; |
5833 | ||
5834 | if (!get_nonnull_operand (TREE_VALUE (args), &arg_num)) | |
5835 | { | |
5836 | error ("nonnull argument has invalid operand number (argument %lu)", | |
5837 | (unsigned long) attr_arg_num); | |
5838 | *no_add_attrs = true; | |
5839 | return NULL_TREE; | |
5840 | } | |
5841 | ||
d7d058c5 | 5842 | if (prototype_p (type)) |
a1ab4c31 | 5843 | { |
d7d058c5 NF |
5844 | function_args_iterator iter; |
5845 | tree argument; | |
5846 | ||
5847 | function_args_iter_init (&iter, type); | |
5848 | for (ck_num = 1; ; ck_num++, function_args_iter_next (&iter)) | |
a1ab4c31 | 5849 | { |
d7d058c5 | 5850 | argument = function_args_iter_cond (&iter); |
a1ab4c31 AC |
5851 | if (!argument || ck_num == arg_num) |
5852 | break; | |
a1ab4c31 AC |
5853 | } |
5854 | ||
5855 | if (!argument | |
d7d058c5 | 5856 | || TREE_CODE (argument) == VOID_TYPE) |
a1ab4c31 | 5857 | { |
58c8f770 EB |
5858 | error ("nonnull argument with out-of-range operand number " |
5859 | "(argument %lu, operand %lu)", | |
a1ab4c31 AC |
5860 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
5861 | *no_add_attrs = true; | |
5862 | return NULL_TREE; | |
5863 | } | |
5864 | ||
d7d058c5 | 5865 | if (TREE_CODE (argument) != POINTER_TYPE) |
a1ab4c31 | 5866 | { |
58c8f770 EB |
5867 | error ("nonnull argument references non-pointer operand " |
5868 | "(argument %lu, operand %lu)", | |
a1ab4c31 AC |
5869 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
5870 | *no_add_attrs = true; | |
5871 | return NULL_TREE; | |
5872 | } | |
5873 | } | |
5874 | } | |
5875 | ||
5876 | return NULL_TREE; | |
5877 | } | |
5878 | ||
5879 | /* Handle a "sentinel" attribute. */ | |
5880 | ||
5881 | static tree | |
5882 | handle_sentinel_attribute (tree *node, tree name, tree args, | |
5883 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5884 | { | |
f4da8dce | 5885 | if (!prototype_p (*node)) |
a1ab4c31 AC |
5886 | { |
5887 | warning (OPT_Wattributes, | |
7948ae37 OH |
5888 | "%qs attribute requires prototypes with named arguments", |
5889 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
5890 | *no_add_attrs = true; |
5891 | } | |
5892 | else | |
5893 | { | |
dcf0c47e | 5894 | if (!stdarg_p (*node)) |
a1ab4c31 AC |
5895 | { |
5896 | warning (OPT_Wattributes, | |
7948ae37 OH |
5897 | "%qs attribute only applies to variadic functions", |
5898 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
5899 | *no_add_attrs = true; |
5900 | } | |
5901 | } | |
5902 | ||
5903 | if (args) | |
5904 | { | |
5905 | tree position = TREE_VALUE (args); | |
5906 | ||
5907 | if (TREE_CODE (position) != INTEGER_CST) | |
5908 | { | |
5909 | warning (0, "requested position is not an integer constant"); | |
5910 | *no_add_attrs = true; | |
5911 | } | |
5912 | else | |
5913 | { | |
5914 | if (tree_int_cst_lt (position, integer_zero_node)) | |
5915 | { | |
5916 | warning (0, "requested position is less than zero"); | |
5917 | *no_add_attrs = true; | |
5918 | } | |
5919 | } | |
5920 | } | |
5921 | ||
5922 | return NULL_TREE; | |
5923 | } | |
5924 | ||
5925 | /* Handle a "noreturn" attribute; arguments as in | |
5926 | struct attribute_spec.handler. */ | |
5927 | ||
5928 | static tree | |
5929 | handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5930 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5931 | { | |
5932 | tree type = TREE_TYPE (*node); | |
5933 | ||
5934 | /* See FIXME comment in c_common_attribute_table. */ | |
5935 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5936 | TREE_THIS_VOLATILE (*node) = 1; | |
5937 | else if (TREE_CODE (type) == POINTER_TYPE | |
5938 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
5939 | TREE_TYPE (*node) | |
5940 | = build_pointer_type | |
5941 | (build_type_variant (TREE_TYPE (type), | |
5942 | TYPE_READONLY (TREE_TYPE (type)), 1)); | |
5943 | else | |
5944 | { | |
7948ae37 OH |
5945 | warning (OPT_Wattributes, "%qs attribute ignored", |
5946 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
5947 | *no_add_attrs = true; |
5948 | } | |
1f0b1322 EB |
5949 | |
5950 | return NULL_TREE; | |
5951 | } | |
5952 | ||
5953 | /* Handle a "noinline" attribute; arguments as in | |
5954 | struct attribute_spec.handler. */ | |
5955 | ||
5956 | static tree | |
5957 | handle_noinline_attribute (tree *node, tree name, | |
5958 | tree ARG_UNUSED (args), | |
5959 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5960 | { | |
5961 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5962 | { | |
5963 | if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (*node))) | |
5964 | { | |
5965 | warning (OPT_Wattributes, "%qE attribute ignored due to conflict " | |
5966 | "with attribute %qs", name, "always_inline"); | |
5967 | *no_add_attrs = true; | |
5968 | } | |
5969 | else | |
5970 | DECL_UNINLINABLE (*node) = 1; | |
5971 | } | |
5972 | else | |
5973 | { | |
5974 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5975 | *no_add_attrs = true; | |
5976 | } | |
5977 | ||
5978 | return NULL_TREE; | |
5979 | } | |
5980 | ||
5981 | /* Handle a "noclone" attribute; arguments as in | |
5982 | struct attribute_spec.handler. */ | |
5983 | ||
5984 | static tree | |
5985 | handle_noclone_attribute (tree *node, tree name, | |
5986 | tree ARG_UNUSED (args), | |
5987 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5988 | { | |
5989 | if (TREE_CODE (*node) != FUNCTION_DECL) | |
5990 | { | |
5991 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5992 | *no_add_attrs = true; | |
5993 | } | |
a1ab4c31 AC |
5994 | |
5995 | return NULL_TREE; | |
5996 | } | |
5997 | ||
0d6e14fd JH |
5998 | /* Handle a "leaf" attribute; arguments as in |
5999 | struct attribute_spec.handler. */ | |
6000 | ||
6001 | static tree | |
f087ea44 | 6002 | handle_leaf_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
0d6e14fd JH |
6003 | int ARG_UNUSED (flags), bool *no_add_attrs) |
6004 | { | |
6005 | if (TREE_CODE (*node) != FUNCTION_DECL) | |
6006 | { | |
6007 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6008 | *no_add_attrs = true; | |
6009 | } | |
6010 | if (!TREE_PUBLIC (*node)) | |
6011 | { | |
32a5388a | 6012 | warning (OPT_Wattributes, "%qE attribute has no effect", name); |
0d6e14fd | 6013 | *no_add_attrs = true; |
f087ea44 AC |
6014 | } |
6015 | ||
6016 | return NULL_TREE; | |
6017 | } | |
6018 | ||
6019 | /* Handle a "always_inline" attribute; arguments as in | |
6020 | struct attribute_spec.handler. */ | |
6021 | ||
6022 | static tree | |
6023 | handle_always_inline_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6024 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6025 | { | |
6026 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
6027 | { | |
6028 | /* Set the attribute and mark it for disregarding inline limits. */ | |
6029 | DECL_DISREGARD_INLINE_LIMITS (*node) = 1; | |
6030 | } | |
6031 | else | |
6032 | { | |
6033 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6034 | *no_add_attrs = true; | |
0d6e14fd JH |
6035 | } |
6036 | ||
6037 | return NULL_TREE; | |
6038 | } | |
6039 | ||
a1ab4c31 AC |
6040 | /* Handle a "malloc" attribute; arguments as in |
6041 | struct attribute_spec.handler. */ | |
6042 | ||
6043 | static tree | |
6044 | handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6045 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6046 | { | |
6047 | if (TREE_CODE (*node) == FUNCTION_DECL | |
6048 | && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node)))) | |
6049 | DECL_IS_MALLOC (*node) = 1; | |
6050 | else | |
6051 | { | |
7948ae37 OH |
6052 | warning (OPT_Wattributes, "%qs attribute ignored", |
6053 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
6054 | *no_add_attrs = true; |
6055 | } | |
6056 | ||
6057 | return NULL_TREE; | |
6058 | } | |
6059 | ||
6060 | /* Fake handler for attributes we don't properly support. */ | |
6061 | ||
6062 | tree | |
6063 | fake_attribute_handler (tree * ARG_UNUSED (node), | |
6064 | tree ARG_UNUSED (name), | |
6065 | tree ARG_UNUSED (args), | |
6066 | int ARG_UNUSED (flags), | |
6067 | bool * ARG_UNUSED (no_add_attrs)) | |
6068 | { | |
6069 | return NULL_TREE; | |
6070 | } | |
6071 | ||
6072 | /* Handle a "type_generic" attribute. */ | |
6073 | ||
6074 | static tree | |
6075 | handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name), | |
6076 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
6077 | bool * ARG_UNUSED (no_add_attrs)) | |
6078 | { | |
a1ab4c31 AC |
6079 | /* Ensure we have a function type. */ |
6080 | gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE); | |
b4680ca1 | 6081 | |
a1ab4c31 | 6082 | /* Ensure we have a variadic function. */ |
dcf0c47e | 6083 | gcc_assert (!prototype_p (*node) || stdarg_p (*node)); |
a1ab4c31 AC |
6084 | |
6085 | return NULL_TREE; | |
6086 | } | |
6087 | ||
2724e58f OH |
6088 | /* Handle a "vector_size" attribute; arguments as in |
6089 | struct attribute_spec.handler. */ | |
6090 | ||
6091 | static tree | |
6092 | handle_vector_size_attribute (tree *node, tree name, tree args, | |
e63b36bd | 6093 | int ARG_UNUSED (flags), bool *no_add_attrs) |
2724e58f | 6094 | { |
e63b36bd EB |
6095 | tree type = *node; |
6096 | tree vector_type; | |
2724e58f OH |
6097 | |
6098 | *no_add_attrs = true; | |
6099 | ||
2724e58f OH |
6100 | /* We need to provide for vector pointers, vector arrays, and |
6101 | functions returning vectors. For example: | |
6102 | ||
6103 | __attribute__((vector_size(16))) short *foo; | |
6104 | ||
6105 | In this case, the mode is SI, but the type being modified is | |
6106 | HI, so we need to look further. */ | |
2724e58f OH |
6107 | while (POINTER_TYPE_P (type) |
6108 | || TREE_CODE (type) == FUNCTION_TYPE | |
132a5459 | 6109 | || TREE_CODE (type) == ARRAY_TYPE) |
2724e58f OH |
6110 | type = TREE_TYPE (type); |
6111 | ||
e63b36bd EB |
6112 | vector_type = build_vector_type_for_size (type, TREE_VALUE (args), name); |
6113 | if (!vector_type) | |
6114 | return NULL_TREE; | |
2724e58f OH |
6115 | |
6116 | /* Build back pointers if needed. */ | |
e63b36bd | 6117 | *node = reconstruct_complex_type (*node, vector_type); |
2724e58f OH |
6118 | |
6119 | return NULL_TREE; | |
6120 | } | |
6121 | ||
7948ae37 OH |
6122 | /* Handle a "vector_type" attribute; arguments as in |
6123 | struct attribute_spec.handler. */ | |
6124 | ||
6125 | static tree | |
6126 | handle_vector_type_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
e63b36bd | 6127 | int ARG_UNUSED (flags), bool *no_add_attrs) |
7948ae37 | 6128 | { |
e63b36bd EB |
6129 | tree type = *node; |
6130 | tree vector_type; | |
7948ae37 OH |
6131 | |
6132 | *no_add_attrs = true; | |
6133 | ||
e63b36bd | 6134 | if (TREE_CODE (type) != ARRAY_TYPE) |
7948ae37 OH |
6135 | { |
6136 | error ("attribute %qs applies to array types only", | |
6137 | IDENTIFIER_POINTER (name)); | |
6138 | return NULL_TREE; | |
6139 | } | |
6140 | ||
e63b36bd EB |
6141 | vector_type = build_vector_type_for_array (type, name); |
6142 | if (!vector_type) | |
7948ae37 OH |
6143 | return NULL_TREE; |
6144 | ||
e63b36bd EB |
6145 | TYPE_REPRESENTATIVE_ARRAY (vector_type) = type; |
6146 | *node = vector_type; | |
7948ae37 OH |
6147 | |
6148 | return NULL_TREE; | |
6149 | } | |
6150 | ||
a1ab4c31 AC |
6151 | /* ----------------------------------------------------------------------- * |
6152 | * BUILTIN FUNCTIONS * | |
6153 | * ----------------------------------------------------------------------- */ | |
6154 | ||
6155 | /* Worker for DEF_BUILTIN. Possibly define a builtin function with one or two | |
6156 | names. Does not declare a non-__builtin_ function if flag_no_builtin, or | |
6157 | if nonansi_p and flag_no_nonansi_builtin. */ | |
6158 | ||
6159 | static void | |
6160 | def_builtin_1 (enum built_in_function fncode, | |
6161 | const char *name, | |
6162 | enum built_in_class fnclass, | |
6163 | tree fntype, tree libtype, | |
6164 | bool both_p, bool fallback_p, | |
6165 | bool nonansi_p ATTRIBUTE_UNUSED, | |
6166 | tree fnattrs, bool implicit_p) | |
6167 | { | |
6168 | tree decl; | |
6169 | const char *libname; | |
6170 | ||
6171 | /* Preserve an already installed decl. It most likely was setup in advance | |
6172 | (e.g. as part of the internal builtins) for specific reasons. */ | |
7c775aca | 6173 | if (builtin_decl_explicit (fncode)) |
a1ab4c31 AC |
6174 | return; |
6175 | ||
6176 | gcc_assert ((!both_p && !fallback_p) | |
6177 | || !strncmp (name, "__builtin_", | |
6178 | strlen ("__builtin_"))); | |
6179 | ||
6180 | libname = name + strlen ("__builtin_"); | |
6181 | decl = add_builtin_function (name, fntype, fncode, fnclass, | |
6182 | (fallback_p ? libname : NULL), | |
6183 | fnattrs); | |
6184 | if (both_p) | |
6185 | /* ??? This is normally further controlled by command-line options | |
6186 | like -fno-builtin, but we don't have them for Ada. */ | |
6187 | add_builtin_function (libname, libtype, fncode, fnclass, | |
6188 | NULL, fnattrs); | |
6189 | ||
e79983f4 | 6190 | set_builtin_decl (fncode, decl, implicit_p); |
a1ab4c31 AC |
6191 | } |
6192 | ||
6193 | static int flag_isoc94 = 0; | |
6194 | static int flag_isoc99 = 0; | |
22869a37 | 6195 | static int flag_isoc11 = 0; |
a1ab4c31 AC |
6196 | |
6197 | /* Install what the common builtins.def offers. */ | |
6198 | ||
6199 | static void | |
6200 | install_builtin_functions (void) | |
6201 | { | |
6202 | #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \ | |
6203 | NONANSI_P, ATTRS, IMPLICIT, COND) \ | |
6204 | if (NAME && COND) \ | |
6205 | def_builtin_1 (ENUM, NAME, CLASS, \ | |
6206 | builtin_types[(int) TYPE], \ | |
6207 | builtin_types[(int) LIBTYPE], \ | |
6208 | BOTH_P, FALLBACK_P, NONANSI_P, \ | |
6209 | built_in_attributes[(int) ATTRS], IMPLICIT); | |
6210 | #include "builtins.def" | |
a1ab4c31 AC |
6211 | } |
6212 | ||
6213 | /* ----------------------------------------------------------------------- * | |
6214 | * BUILTIN FUNCTIONS * | |
6215 | * ----------------------------------------------------------------------- */ | |
6216 | ||
6217 | /* Install the builtin functions we might need. */ | |
6218 | ||
6219 | void | |
6220 | gnat_install_builtins (void) | |
6221 | { | |
6222 | install_builtin_elementary_types (); | |
6223 | install_builtin_function_types (); | |
6224 | install_builtin_attributes (); | |
6225 | ||
6226 | /* Install builtins used by generic middle-end pieces first. Some of these | |
6227 | know about internal specificities and control attributes accordingly, for | |
6228 | instance __builtin_alloca vs no-throw and -fstack-check. We will ignore | |
6229 | the generic definition from builtins.def. */ | |
384c400a | 6230 | build_common_builtin_nodes (); |
a1ab4c31 AC |
6231 | |
6232 | /* Now, install the target specific builtins, such as the AltiVec family on | |
6233 | ppc, and the common set as exposed by builtins.def. */ | |
6234 | targetm.init_builtins (); | |
6235 | install_builtin_functions (); | |
6236 | } | |
6237 | ||
6238 | #include "gt-ada-utils.h" | |
6239 | #include "gtype-ada.h" |