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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 | * * | |
0e24192c | 9 | * Copyright (C) 1992-2013, 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" | |
29 | #include "tm.h" | |
30 | #include "tree.h" | |
31 | #include "flags.h" | |
a1ab4c31 | 32 | #include "toplev.h" |
718f9c0f | 33 | #include "diagnostic-core.h" |
a1ab4c31 AC |
34 | #include "output.h" |
35 | #include "ggc.h" | |
36 | #include "debug.h" | |
37 | #include "convert.h" | |
38 | #include "target.h" | |
677f3fa8 | 39 | #include "common/common-target.h" |
8713b7e4 | 40 | #include "langhooks.h" |
a1ab4c31 | 41 | #include "cgraph.h" |
10e4d056 | 42 | #include "diagnostic.h" |
7ee2468b | 43 | #include "timevar.h" |
8713b7e4 | 44 | #include "tree-dump.h" |
a1ab4c31 AC |
45 | #include "tree-inline.h" |
46 | #include "tree-iterator.h" | |
a1ab4c31 AC |
47 | |
48 | #include "ada.h" | |
49 | #include "types.h" | |
50 | #include "atree.h" | |
51 | #include "elists.h" | |
52 | #include "namet.h" | |
53 | #include "nlists.h" | |
54 | #include "stringt.h" | |
55 | #include "uintp.h" | |
56 | #include "fe.h" | |
57 | #include "sinfo.h" | |
58 | #include "einfo.h" | |
59 | #include "ada-tree.h" | |
60 | #include "gigi.h" | |
61 | ||
a1ab4c31 AC |
62 | /* If nonzero, pretend we are allocating at global level. */ |
63 | int force_global; | |
64 | ||
caa9d12a EB |
65 | /* The default alignment of "double" floating-point types, i.e. floating |
66 | point types whose size is equal to 64 bits, or 0 if this alignment is | |
67 | not specifically capped. */ | |
68 | int double_float_alignment; | |
69 | ||
70 | /* The default alignment of "double" or larger scalar types, i.e. scalar | |
71 | types whose size is greater or equal to 64 bits, or 0 if this alignment | |
72 | is not specifically capped. */ | |
73 | int double_scalar_alignment; | |
74 | ||
a1ab4c31 AC |
75 | /* Tree nodes for the various types and decls we create. */ |
76 | tree gnat_std_decls[(int) ADT_LAST]; | |
77 | ||
78 | /* Functions to call for each of the possible raise reasons. */ | |
79 | tree gnat_raise_decls[(int) LAST_REASON_CODE + 1]; | |
80 | ||
ca8e13e8 | 81 | /* Likewise, but with extra info for each of the possible raise reasons. */ |
437f8c1e AC |
82 | tree gnat_raise_decls_ext[(int) LAST_REASON_CODE + 1]; |
83 | ||
a1ab4c31 AC |
84 | /* Forward declarations for handlers of attributes. */ |
85 | static tree handle_const_attribute (tree *, tree, tree, int, bool *); | |
86 | static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); | |
87 | static tree handle_pure_attribute (tree *, tree, tree, int, bool *); | |
88 | static tree handle_novops_attribute (tree *, tree, tree, int, bool *); | |
89 | static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); | |
90 | static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *); | |
91 | static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); | |
0d6e14fd | 92 | static tree handle_leaf_attribute (tree *, tree, tree, int, bool *); |
a1ab4c31 AC |
93 | static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); |
94 | static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *); | |
2724e58f | 95 | static tree handle_vector_size_attribute (tree *, tree, tree, int, bool *); |
7948ae37 | 96 | static tree handle_vector_type_attribute (tree *, tree, tree, int, bool *); |
a1ab4c31 AC |
97 | |
98 | /* Fake handler for attributes we don't properly support, typically because | |
99 | they'd require dragging a lot of the common-c front-end circuitry. */ | |
100 | static tree fake_attribute_handler (tree *, tree, tree, int, bool *); | |
101 | ||
102 | /* Table of machine-independent internal attributes for Ada. We support | |
103 | this minimal set of attributes to accommodate the needs of builtins. */ | |
104 | const struct attribute_spec gnat_internal_attribute_table[] = | |
105 | { | |
62d784f7 KT |
106 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler, |
107 | affects_type_identity } */ | |
108 | { "const", 0, 0, true, false, false, handle_const_attribute, | |
109 | false }, | |
110 | { "nothrow", 0, 0, true, false, false, handle_nothrow_attribute, | |
111 | false }, | |
112 | { "pure", 0, 0, true, false, false, handle_pure_attribute, | |
113 | false }, | |
114 | { "no vops", 0, 0, true, false, false, handle_novops_attribute, | |
115 | false }, | |
116 | { "nonnull", 0, -1, false, true, true, handle_nonnull_attribute, | |
117 | false }, | |
118 | { "sentinel", 0, 1, false, true, true, handle_sentinel_attribute, | |
119 | false }, | |
120 | { "noreturn", 0, 0, true, false, false, handle_noreturn_attribute, | |
121 | false }, | |
122 | { "leaf", 0, 0, true, false, false, handle_leaf_attribute, | |
123 | false }, | |
124 | { "malloc", 0, 0, true, false, false, handle_malloc_attribute, | |
125 | false }, | |
126 | { "type generic", 0, 0, false, true, true, handle_type_generic_attribute, | |
127 | false }, | |
128 | ||
129 | { "vector_size", 1, 1, false, true, false, handle_vector_size_attribute, | |
130 | false }, | |
131 | { "vector_type", 0, 0, false, true, false, handle_vector_type_attribute, | |
132 | false }, | |
133 | { "may_alias", 0, 0, false, true, false, NULL, false }, | |
a1ab4c31 AC |
134 | |
135 | /* ??? format and format_arg are heavy and not supported, which actually | |
136 | prevents support for stdio builtins, which we however declare as part | |
137 | of the common builtins.def contents. */ | |
62d784f7 KT |
138 | { "format", 3, 3, false, true, true, fake_attribute_handler, false }, |
139 | { "format_arg", 1, 1, false, true, true, fake_attribute_handler, false }, | |
a1ab4c31 | 140 | |
62d784f7 | 141 | { NULL, 0, 0, false, false, false, NULL, false } |
a1ab4c31 AC |
142 | }; |
143 | ||
144 | /* Associates a GNAT tree node to a GCC tree node. It is used in | |
145 | `save_gnu_tree', `get_gnu_tree' and `present_gnu_tree'. See documentation | |
146 | of `save_gnu_tree' for more info. */ | |
147 | static GTY((length ("max_gnat_nodes"))) tree *associate_gnat_to_gnu; | |
148 | ||
149 | #define GET_GNU_TREE(GNAT_ENTITY) \ | |
150 | associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] | |
151 | ||
152 | #define SET_GNU_TREE(GNAT_ENTITY,VAL) \ | |
153 | associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] = (VAL) | |
154 | ||
155 | #define PRESENT_GNU_TREE(GNAT_ENTITY) \ | |
156 | (associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE) | |
157 | ||
158 | /* Associates a GNAT entity to a GCC tree node used as a dummy, if any. */ | |
159 | static GTY((length ("max_gnat_nodes"))) tree *dummy_node_table; | |
160 | ||
161 | #define GET_DUMMY_NODE(GNAT_ENTITY) \ | |
162 | dummy_node_table[(GNAT_ENTITY) - First_Node_Id] | |
163 | ||
164 | #define SET_DUMMY_NODE(GNAT_ENTITY,VAL) \ | |
165 | dummy_node_table[(GNAT_ENTITY) - First_Node_Id] = (VAL) | |
166 | ||
167 | #define PRESENT_DUMMY_NODE(GNAT_ENTITY) \ | |
168 | (dummy_node_table[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE) | |
169 | ||
170 | /* This variable keeps a table for types for each precision so that we only | |
171 | allocate each of them once. Signed and unsigned types are kept separate. | |
172 | ||
173 | Note that these types are only used when fold-const requests something | |
174 | special. Perhaps we should NOT share these types; we'll see how it | |
175 | goes later. */ | |
176 | static GTY(()) tree signed_and_unsigned_types[2 * MAX_BITS_PER_WORD + 1][2]; | |
177 | ||
178 | /* Likewise for float types, but record these by mode. */ | |
179 | static GTY(()) tree float_types[NUM_MACHINE_MODES]; | |
180 | ||
181 | /* For each binding contour we allocate a binding_level structure to indicate | |
182 | the binding depth. */ | |
183 | ||
d1b38208 | 184 | struct GTY((chain_next ("%h.chain"))) gnat_binding_level { |
a1ab4c31 AC |
185 | /* The binding level containing this one (the enclosing binding level). */ |
186 | struct gnat_binding_level *chain; | |
187 | /* The BLOCK node for this level. */ | |
188 | tree block; | |
189 | /* If nonzero, the setjmp buffer that needs to be updated for any | |
190 | variable-sized definition within this context. */ | |
191 | tree jmpbuf_decl; | |
192 | }; | |
193 | ||
194 | /* The binding level currently in effect. */ | |
195 | static GTY(()) struct gnat_binding_level *current_binding_level; | |
196 | ||
197 | /* A chain of gnat_binding_level structures awaiting reuse. */ | |
198 | static GTY((deletable)) struct gnat_binding_level *free_binding_level; | |
199 | ||
228ee426 EB |
200 | /* The context to be used for global declarations. */ |
201 | static GTY(()) tree global_context; | |
202 | ||
a1ab4c31 | 203 | /* An array of global declarations. */ |
9771b263 | 204 | static GTY(()) vec<tree, va_gc> *global_decls; |
a1ab4c31 AC |
205 | |
206 | /* An array of builtin function declarations. */ | |
9771b263 | 207 | static GTY(()) vec<tree, va_gc> *builtin_decls; |
a1ab4c31 AC |
208 | |
209 | /* An array of global renaming pointers. */ | |
9771b263 | 210 | static GTY(()) vec<tree, va_gc> *global_renaming_pointers; |
a1ab4c31 AC |
211 | |
212 | /* A chain of unused BLOCK nodes. */ | |
213 | static GTY((deletable)) tree free_block_chain; | |
214 | ||
842d4ee2 EB |
215 | static int pad_type_hash_marked_p (const void *p); |
216 | static hashval_t pad_type_hash_hash (const void *p); | |
217 | static int pad_type_hash_eq (const void *p1, const void *p2); | |
218 | ||
219 | /* A hash table of padded types. It is modelled on the generic type | |
220 | hash table in tree.c, which must thus be used as a reference. */ | |
221 | struct GTY(()) pad_type_hash { | |
222 | unsigned long hash; | |
223 | tree type; | |
224 | }; | |
225 | ||
226 | static GTY ((if_marked ("pad_type_hash_marked_p"), | |
227 | param_is (struct pad_type_hash))) | |
228 | htab_t pad_type_hash_table; | |
229 | ||
a1ab4c31 AC |
230 | static tree merge_sizes (tree, tree, tree, bool, bool); |
231 | static tree compute_related_constant (tree, tree); | |
232 | static tree split_plus (tree, tree *); | |
a1ab4c31 AC |
233 | static tree float_type_for_precision (int, enum machine_mode); |
234 | static tree convert_to_fat_pointer (tree, tree); | |
a1ab4c31 AC |
235 | static bool potential_alignment_gap (tree, tree, tree); |
236 | \f | |
842d4ee2 | 237 | /* Initialize data structures of the utils.c module. */ |
a1ab4c31 AC |
238 | |
239 | void | |
842d4ee2 | 240 | init_gnat_utils (void) |
a1ab4c31 | 241 | { |
842d4ee2 | 242 | /* Initialize the association of GNAT nodes to GCC trees. */ |
a9429e29 | 243 | associate_gnat_to_gnu = ggc_alloc_cleared_vec_tree (max_gnat_nodes); |
842d4ee2 EB |
244 | |
245 | /* Initialize the association of GNAT nodes to GCC trees as dummies. */ | |
246 | dummy_node_table = ggc_alloc_cleared_vec_tree (max_gnat_nodes); | |
247 | ||
248 | /* Initialize the hash table of padded types. */ | |
249 | pad_type_hash_table = htab_create_ggc (512, pad_type_hash_hash, | |
250 | pad_type_hash_eq, 0); | |
a1ab4c31 AC |
251 | } |
252 | ||
842d4ee2 | 253 | /* Destroy data structures of the utils.c module. */ |
f04b8d69 EB |
254 | |
255 | void | |
842d4ee2 | 256 | destroy_gnat_utils (void) |
f04b8d69 | 257 | { |
842d4ee2 | 258 | /* Destroy the association of GNAT nodes to GCC trees. */ |
f04b8d69 EB |
259 | ggc_free (associate_gnat_to_gnu); |
260 | associate_gnat_to_gnu = NULL; | |
f04b8d69 | 261 | |
842d4ee2 EB |
262 | /* Destroy the association of GNAT nodes to GCC trees as dummies. */ |
263 | ggc_free (dummy_node_table); | |
264 | dummy_node_table = NULL; | |
265 | ||
266 | /* Destroy the hash table of padded types. */ | |
267 | htab_delete (pad_type_hash_table); | |
268 | pad_type_hash_table = NULL; | |
269 | ||
270 | /* Invalidate the global renaming pointers. */ | |
271 | invalidate_global_renaming_pointers (); | |
272 | } | |
273 | \f | |
a1d8cc63 EB |
274 | /* GNAT_ENTITY is a GNAT tree node for an entity. Associate GNU_DECL, a GCC |
275 | tree node, with GNAT_ENTITY. If GNU_DECL is not a ..._DECL node, abort. | |
276 | If NO_CHECK is true, the latter check is suppressed. | |
a1ab4c31 | 277 | |
a1d8cc63 | 278 | If GNU_DECL is zero, reset a previous association. */ |
a1ab4c31 AC |
279 | |
280 | void | |
281 | save_gnu_tree (Entity_Id gnat_entity, tree gnu_decl, bool no_check) | |
282 | { | |
283 | /* Check that GNAT_ENTITY is not already defined and that it is being set | |
a1d8cc63 | 284 | to something which is a decl. If that is not the case, this usually |
a1ab4c31 AC |
285 | means GNAT_ENTITY is defined twice, but occasionally is due to some |
286 | Gigi problem. */ | |
287 | gcc_assert (!(gnu_decl | |
288 | && (PRESENT_GNU_TREE (gnat_entity) | |
289 | || (!no_check && !DECL_P (gnu_decl))))); | |
290 | ||
291 | SET_GNU_TREE (gnat_entity, gnu_decl); | |
292 | } | |
293 | ||
a1d8cc63 EB |
294 | /* GNAT_ENTITY is a GNAT tree node for an entity. Return the GCC tree node |
295 | that was associated with it. If there is no such tree node, abort. | |
a1ab4c31 AC |
296 | |
297 | In some cases, such as delayed elaboration or expressions that need to | |
298 | be elaborated only once, GNAT_ENTITY is really not an entity. */ | |
299 | ||
300 | tree | |
301 | get_gnu_tree (Entity_Id gnat_entity) | |
302 | { | |
303 | gcc_assert (PRESENT_GNU_TREE (gnat_entity)); | |
304 | return GET_GNU_TREE (gnat_entity); | |
305 | } | |
306 | ||
307 | /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */ | |
308 | ||
309 | bool | |
310 | present_gnu_tree (Entity_Id gnat_entity) | |
311 | { | |
312 | return PRESENT_GNU_TREE (gnat_entity); | |
313 | } | |
314 | \f | |
a1ab4c31 AC |
315 | /* Make a dummy type corresponding to GNAT_TYPE. */ |
316 | ||
317 | tree | |
318 | make_dummy_type (Entity_Id gnat_type) | |
319 | { | |
320 | Entity_Id gnat_underlying = Gigi_Equivalent_Type (gnat_type); | |
321 | tree gnu_type; | |
322 | ||
323 | /* If there is an equivalent type, get its underlying type. */ | |
324 | if (Present (gnat_underlying)) | |
a0b8b1b7 | 325 | gnat_underlying = Gigi_Equivalent_Type (Underlying_Type (gnat_underlying)); |
a1ab4c31 AC |
326 | |
327 | /* If there was no equivalent type (can only happen when just annotating | |
328 | types) or underlying type, go back to the original type. */ | |
329 | if (No (gnat_underlying)) | |
330 | gnat_underlying = gnat_type; | |
331 | ||
332 | /* If it there already a dummy type, use that one. Else make one. */ | |
333 | if (PRESENT_DUMMY_NODE (gnat_underlying)) | |
334 | return GET_DUMMY_NODE (gnat_underlying); | |
335 | ||
336 | /* If this is a record, make a RECORD_TYPE or UNION_TYPE; else make | |
337 | an ENUMERAL_TYPE. */ | |
338 | gnu_type = make_node (Is_Record_Type (gnat_underlying) | |
339 | ? tree_code_for_record_type (gnat_underlying) | |
340 | : ENUMERAL_TYPE); | |
341 | TYPE_NAME (gnu_type) = get_entity_name (gnat_type); | |
342 | TYPE_DUMMY_P (gnu_type) = 1; | |
10069d53 EB |
343 | TYPE_STUB_DECL (gnu_type) |
344 | = create_type_stub_decl (TYPE_NAME (gnu_type), gnu_type); | |
a0b8b1b7 EB |
345 | if (Is_By_Reference_Type (gnat_underlying)) |
346 | TYPE_BY_REFERENCE_P (gnu_type) = 1; | |
a1ab4c31 AC |
347 | |
348 | SET_DUMMY_NODE (gnat_underlying, gnu_type); | |
349 | ||
350 | return gnu_type; | |
351 | } | |
e3edbd56 EB |
352 | |
353 | /* Return the dummy type that was made for GNAT_TYPE, if any. */ | |
354 | ||
355 | tree | |
356 | get_dummy_type (Entity_Id gnat_type) | |
357 | { | |
358 | return GET_DUMMY_NODE (gnat_type); | |
359 | } | |
360 | ||
361 | /* Build dummy fat and thin pointer types whose designated type is specified | |
362 | by GNAT_DESIG_TYPE/GNU_DESIG_TYPE and attach them to the latter. */ | |
363 | ||
364 | void | |
365 | build_dummy_unc_pointer_types (Entity_Id gnat_desig_type, tree gnu_desig_type) | |
366 | { | |
367 | tree gnu_template_type, gnu_ptr_template, gnu_array_type, gnu_ptr_array; | |
368 | tree gnu_fat_type, fields, gnu_object_type; | |
369 | ||
370 | gnu_template_type = make_node (RECORD_TYPE); | |
371 | TYPE_NAME (gnu_template_type) = create_concat_name (gnat_desig_type, "XUB"); | |
372 | TYPE_DUMMY_P (gnu_template_type) = 1; | |
373 | gnu_ptr_template = build_pointer_type (gnu_template_type); | |
374 | ||
375 | gnu_array_type = make_node (ENUMERAL_TYPE); | |
376 | TYPE_NAME (gnu_array_type) = create_concat_name (gnat_desig_type, "XUA"); | |
377 | TYPE_DUMMY_P (gnu_array_type) = 1; | |
378 | gnu_ptr_array = build_pointer_type (gnu_array_type); | |
379 | ||
380 | gnu_fat_type = make_node (RECORD_TYPE); | |
381 | /* Build a stub DECL to trigger the special processing for fat pointer types | |
382 | in gnat_pushdecl. */ | |
383 | TYPE_NAME (gnu_fat_type) | |
384 | = create_type_stub_decl (create_concat_name (gnat_desig_type, "XUP"), | |
385 | gnu_fat_type); | |
386 | fields = create_field_decl (get_identifier ("P_ARRAY"), gnu_ptr_array, | |
387 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
388 | DECL_CHAIN (fields) | |
389 | = create_field_decl (get_identifier ("P_BOUNDS"), gnu_ptr_template, | |
390 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
391 | finish_fat_pointer_type (gnu_fat_type, fields); | |
392 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_desig_type); | |
393 | /* Suppress debug info until after the type is completed. */ | |
394 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (gnu_fat_type)) = 1; | |
395 | ||
396 | gnu_object_type = make_node (RECORD_TYPE); | |
397 | TYPE_NAME (gnu_object_type) = create_concat_name (gnat_desig_type, "XUT"); | |
398 | TYPE_DUMMY_P (gnu_object_type) = 1; | |
399 | ||
400 | TYPE_POINTER_TO (gnu_desig_type) = gnu_fat_type; | |
401 | TYPE_OBJECT_RECORD_TYPE (gnu_desig_type) = gnu_object_type; | |
402 | } | |
a1ab4c31 | 403 | \f |
c99c0026 | 404 | /* Return true if we are in the global binding level. */ |
a1ab4c31 | 405 | |
c99c0026 | 406 | bool |
a1ab4c31 AC |
407 | global_bindings_p (void) |
408 | { | |
c99c0026 | 409 | return force_global || current_function_decl == NULL_TREE; |
a1ab4c31 AC |
410 | } |
411 | ||
a09d56d8 | 412 | /* Enter a new binding level. */ |
a1ab4c31 AC |
413 | |
414 | void | |
c6bd4220 | 415 | gnat_pushlevel (void) |
a1ab4c31 AC |
416 | { |
417 | struct gnat_binding_level *newlevel = NULL; | |
418 | ||
419 | /* Reuse a struct for this binding level, if there is one. */ | |
420 | if (free_binding_level) | |
421 | { | |
422 | newlevel = free_binding_level; | |
423 | free_binding_level = free_binding_level->chain; | |
424 | } | |
425 | else | |
a9429e29 | 426 | newlevel = ggc_alloc_gnat_binding_level (); |
a1ab4c31 AC |
427 | |
428 | /* Use a free BLOCK, if any; otherwise, allocate one. */ | |
429 | if (free_block_chain) | |
430 | { | |
431 | newlevel->block = free_block_chain; | |
432 | free_block_chain = BLOCK_CHAIN (free_block_chain); | |
433 | BLOCK_CHAIN (newlevel->block) = NULL_TREE; | |
434 | } | |
435 | else | |
436 | newlevel->block = make_node (BLOCK); | |
437 | ||
438 | /* Point the BLOCK we just made to its parent. */ | |
439 | if (current_binding_level) | |
440 | BLOCK_SUPERCONTEXT (newlevel->block) = current_binding_level->block; | |
441 | ||
a09d56d8 EB |
442 | BLOCK_VARS (newlevel->block) = NULL_TREE; |
443 | BLOCK_SUBBLOCKS (newlevel->block) = NULL_TREE; | |
a1ab4c31 AC |
444 | TREE_USED (newlevel->block) = 1; |
445 | ||
a09d56d8 | 446 | /* Add this level to the front of the chain (stack) of active levels. */ |
a1ab4c31 AC |
447 | newlevel->chain = current_binding_level; |
448 | newlevel->jmpbuf_decl = NULL_TREE; | |
449 | current_binding_level = newlevel; | |
450 | } | |
451 | ||
452 | /* Set SUPERCONTEXT of the BLOCK for the current binding level to FNDECL | |
453 | and point FNDECL to this BLOCK. */ | |
454 | ||
455 | void | |
456 | set_current_block_context (tree fndecl) | |
457 | { | |
458 | BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl; | |
459 | DECL_INITIAL (fndecl) = current_binding_level->block; | |
a09d56d8 | 460 | set_block_for_group (current_binding_level->block); |
a1ab4c31 AC |
461 | } |
462 | ||
463 | /* Set the jmpbuf_decl for the current binding level to DECL. */ | |
464 | ||
465 | void | |
466 | set_block_jmpbuf_decl (tree decl) | |
467 | { | |
468 | current_binding_level->jmpbuf_decl = decl; | |
469 | } | |
470 | ||
471 | /* Get the jmpbuf_decl, if any, for the current binding level. */ | |
472 | ||
473 | tree | |
c6bd4220 | 474 | get_block_jmpbuf_decl (void) |
a1ab4c31 AC |
475 | { |
476 | return current_binding_level->jmpbuf_decl; | |
477 | } | |
478 | ||
a09d56d8 | 479 | /* Exit a binding level. Set any BLOCK into the current code group. */ |
a1ab4c31 AC |
480 | |
481 | void | |
c6bd4220 | 482 | gnat_poplevel (void) |
a1ab4c31 AC |
483 | { |
484 | struct gnat_binding_level *level = current_binding_level; | |
485 | tree block = level->block; | |
486 | ||
487 | BLOCK_VARS (block) = nreverse (BLOCK_VARS (block)); | |
72ac05b0 | 488 | BLOCK_SUBBLOCKS (block) = blocks_nreverse (BLOCK_SUBBLOCKS (block)); |
a1ab4c31 AC |
489 | |
490 | /* If this is a function-level BLOCK don't do anything. Otherwise, if there | |
491 | are no variables free the block and merge its subblocks into those of its | |
a09d56d8 | 492 | parent block. Otherwise, add it to the list of its parent. */ |
a1ab4c31 AC |
493 | if (TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL) |
494 | ; | |
495 | else if (BLOCK_VARS (block) == NULL_TREE) | |
496 | { | |
497 | BLOCK_SUBBLOCKS (level->chain->block) | |
61e46a7d NF |
498 | = block_chainon (BLOCK_SUBBLOCKS (block), |
499 | BLOCK_SUBBLOCKS (level->chain->block)); | |
a1ab4c31 AC |
500 | BLOCK_CHAIN (block) = free_block_chain; |
501 | free_block_chain = block; | |
502 | } | |
503 | else | |
504 | { | |
505 | BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (level->chain->block); | |
506 | BLOCK_SUBBLOCKS (level->chain->block) = block; | |
507 | TREE_USED (block) = 1; | |
508 | set_block_for_group (block); | |
509 | } | |
510 | ||
511 | /* Free this binding structure. */ | |
512 | current_binding_level = level->chain; | |
513 | level->chain = free_binding_level; | |
514 | free_binding_level = level; | |
515 | } | |
516 | ||
2231f17f EB |
517 | /* Exit a binding level and discard the associated BLOCK. */ |
518 | ||
519 | void | |
520 | gnat_zaplevel (void) | |
521 | { | |
522 | struct gnat_binding_level *level = current_binding_level; | |
523 | tree block = level->block; | |
524 | ||
525 | BLOCK_CHAIN (block) = free_block_chain; | |
526 | free_block_chain = block; | |
527 | ||
528 | /* Free this binding structure. */ | |
529 | current_binding_level = level->chain; | |
530 | level->chain = free_binding_level; | |
531 | free_binding_level = level; | |
532 | } | |
a1ab4c31 | 533 | \f |
4708440c EB |
534 | /* Set the context of TYPE and its parallel types (if any) to CONTEXT. */ |
535 | ||
536 | static void | |
537 | gnat_set_type_context (tree type, tree context) | |
538 | { | |
539 | tree decl = TYPE_STUB_DECL (type); | |
540 | ||
541 | TYPE_CONTEXT (type) = context; | |
542 | ||
543 | while (decl && DECL_PARALLEL_TYPE (decl)) | |
544 | { | |
545 | TYPE_CONTEXT (DECL_PARALLEL_TYPE (decl)) = context; | |
546 | decl = TYPE_STUB_DECL (DECL_PARALLEL_TYPE (decl)); | |
547 | } | |
548 | } | |
549 | ||
228ee426 EB |
550 | /* Record DECL as belonging to the current lexical scope and use GNAT_NODE |
551 | for location information and flag propagation. */ | |
a1ab4c31 AC |
552 | |
553 | void | |
554 | gnat_pushdecl (tree decl, Node_Id gnat_node) | |
555 | { | |
228ee426 | 556 | /* If DECL is public external or at top level, it has global context. */ |
bd9c7fb9 | 557 | if ((TREE_PUBLIC (decl) && DECL_EXTERNAL (decl)) || global_bindings_p ()) |
228ee426 EB |
558 | { |
559 | if (!global_context) | |
560 | global_context = build_translation_unit_decl (NULL_TREE); | |
561 | DECL_CONTEXT (decl) = global_context; | |
562 | } | |
a1ab4c31 AC |
563 | else |
564 | { | |
565 | DECL_CONTEXT (decl) = current_function_decl; | |
566 | ||
9f62cb92 JJ |
567 | /* Functions imported in another function are not really nested. |
568 | For really nested functions mark them initially as needing | |
569 | a static chain for uses of that flag before unnesting; | |
570 | lower_nested_functions will then recompute it. */ | |
571 | if (TREE_CODE (decl) == FUNCTION_DECL && !TREE_PUBLIC (decl)) | |
572 | DECL_STATIC_CHAIN (decl) = 1; | |
a1ab4c31 AC |
573 | } |
574 | ||
228ee426 | 575 | TREE_NO_WARNING (decl) = (No (gnat_node) || Warnings_Off (gnat_node)); |
a1ab4c31 AC |
576 | |
577 | /* Set the location of DECL and emit a declaration for it. */ | |
578 | if (Present (gnat_node)) | |
579 | Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (decl)); | |
228ee426 | 580 | |
a1ab4c31 AC |
581 | add_decl_expr (decl, gnat_node); |
582 | ||
583 | /* Put the declaration on the list. The list of declarations is in reverse | |
2231f17f EB |
584 | order. The list will be reversed later. Put global declarations in the |
585 | globals list and local ones in the current block. But skip TYPE_DECLs | |
586 | for UNCONSTRAINED_ARRAY_TYPE in both cases, as they will cause trouble | |
587 | with the debugger and aren't needed anyway. */ | |
588 | if (!(TREE_CODE (decl) == TYPE_DECL | |
589 | && TREE_CODE (TREE_TYPE (decl)) == UNCONSTRAINED_ARRAY_TYPE)) | |
a1ab4c31 | 590 | { |
9083aacd | 591 | if (DECL_EXTERNAL (decl)) |
a1ab4c31 | 592 | { |
a1ab4c31 | 593 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)) |
9771b263 | 594 | vec_safe_push (builtin_decls, decl); |
a1ab4c31 | 595 | } |
9083aacd | 596 | else if (global_bindings_p ()) |
9771b263 | 597 | vec_safe_push (global_decls, decl); |
9083aacd | 598 | else |
a1ab4c31 | 599 | { |
a963da4d EB |
600 | DECL_CHAIN (decl) = BLOCK_VARS (current_binding_level->block); |
601 | BLOCK_VARS (current_binding_level->block) = decl; | |
a1ab4c31 AC |
602 | } |
603 | } | |
604 | ||
605 | /* For the declaration of a type, set its name if it either is not already | |
10069d53 | 606 | set or if the previous type name was not derived from a source name. |
a1ab4c31 AC |
607 | We'd rather have the type named with a real name and all the pointer |
608 | types to the same object have the same POINTER_TYPE node. Code in the | |
609 | equivalent function of c-decl.c makes a copy of the type node here, but | |
610 | that may cause us trouble with incomplete types. We make an exception | |
611 | for fat pointer types because the compiler automatically builds them | |
612 | for unconstrained array types and the debugger uses them to represent | |
613 | both these and pointers to these. */ | |
614 | if (TREE_CODE (decl) == TYPE_DECL && DECL_NAME (decl)) | |
615 | { | |
616 | tree t = TREE_TYPE (decl); | |
617 | ||
10069d53 | 618 | if (!(TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)) |
1aeb40dd | 619 | { |
4cb12a90 | 620 | /* Array and pointer types aren't "tagged" types so we force the |
1aeb40dd EB |
621 | type to be associated with its typedef in the DWARF back-end, |
622 | in order to make sure that the latter is always preserved. */ | |
4cb12a90 EB |
623 | if (!DECL_ARTIFICIAL (decl) |
624 | && (TREE_CODE (t) == ARRAY_TYPE | |
625 | || TREE_CODE (t) == POINTER_TYPE)) | |
1aeb40dd EB |
626 | { |
627 | tree tt = build_distinct_type_copy (t); | |
4cb12a90 EB |
628 | if (TREE_CODE (t) == POINTER_TYPE) |
629 | TYPE_NEXT_PTR_TO (t) = tt; | |
1aeb40dd | 630 | TYPE_NAME (tt) = DECL_NAME (decl); |
4708440c | 631 | gnat_set_type_context (tt, DECL_CONTEXT (decl)); |
1aeb40dd EB |
632 | TYPE_STUB_DECL (tt) = TYPE_STUB_DECL (t); |
633 | DECL_ORIGINAL_TYPE (decl) = tt; | |
634 | } | |
635 | } | |
315cff15 | 636 | else if (TYPE_IS_FAT_POINTER_P (t)) |
a1ab4c31 | 637 | { |
e3edbd56 | 638 | /* We need a variant for the placeholder machinery to work. */ |
a1ab4c31 AC |
639 | tree tt = build_variant_type_copy (t); |
640 | TYPE_NAME (tt) = decl; | |
4708440c | 641 | gnat_set_type_context (tt, DECL_CONTEXT (decl)); |
a1ab4c31 AC |
642 | TREE_USED (tt) = TREE_USED (t); |
643 | TREE_TYPE (decl) = tt; | |
40c88b94 EB |
644 | if (DECL_ORIGINAL_TYPE (TYPE_NAME (t))) |
645 | DECL_ORIGINAL_TYPE (decl) = DECL_ORIGINAL_TYPE (TYPE_NAME (t)); | |
646 | else | |
647 | DECL_ORIGINAL_TYPE (decl) = t; | |
40c88b94 | 648 | DECL_ARTIFICIAL (decl) = 0; |
e3edbd56 | 649 | t = NULL_TREE; |
a1ab4c31 AC |
650 | } |
651 | else if (DECL_ARTIFICIAL (TYPE_NAME (t)) && !DECL_ARTIFICIAL (decl)) | |
652 | ; | |
653 | else | |
654 | t = NULL_TREE; | |
655 | ||
e3edbd56 EB |
656 | /* Propagate the name to all the anonymous variants. This is needed |
657 | for the type qualifiers machinery to work properly. */ | |
a1ab4c31 AC |
658 | if (t) |
659 | for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t)) | |
e3edbd56 | 660 | if (!(TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)) |
d4d05b52 EB |
661 | { |
662 | TYPE_NAME (t) = decl; | |
4708440c | 663 | gnat_set_type_context (t, DECL_CONTEXT (decl)); |
d4d05b52 | 664 | } |
a1ab4c31 AC |
665 | } |
666 | } | |
667 | \f | |
842d4ee2 EB |
668 | /* Create a record type that contains a SIZE bytes long field of TYPE with a |
669 | starting bit position so that it is aligned to ALIGN bits, and leaving at | |
670 | least ROOM bytes free before the field. BASE_ALIGN is the alignment the | |
0746af5e EB |
671 | record is guaranteed to get. GNAT_NODE is used for the position of the |
672 | associated TYPE_DECL. */ | |
842d4ee2 EB |
673 | |
674 | tree | |
675 | make_aligning_type (tree type, unsigned int align, tree size, | |
0746af5e | 676 | unsigned int base_align, int room, Node_Id gnat_node) |
842d4ee2 EB |
677 | { |
678 | /* We will be crafting a record type with one field at a position set to be | |
679 | the next multiple of ALIGN past record'address + room bytes. We use a | |
680 | record placeholder to express record'address. */ | |
681 | tree record_type = make_node (RECORD_TYPE); | |
682 | tree record = build0 (PLACEHOLDER_EXPR, record_type); | |
683 | ||
684 | tree record_addr_st | |
685 | = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record)); | |
686 | ||
687 | /* The diagram below summarizes the shape of what we manipulate: | |
688 | ||
689 | <--------- pos ----------> | |
690 | { +------------+-------------+-----------------+ | |
691 | record =>{ |############| ... | field (type) | | |
692 | { +------------+-------------+-----------------+ | |
693 | |<-- room -->|<- voffset ->|<---- size ----->| | |
694 | o o | |
695 | | | | |
696 | record_addr vblock_addr | |
697 | ||
698 | Every length is in sizetype bytes there, except "pos" which has to be | |
699 | set as a bit position in the GCC tree for the record. */ | |
700 | tree room_st = size_int (room); | |
701 | tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st); | |
702 | tree voffset_st, pos, field; | |
703 | ||
704 | tree name = TYPE_NAME (type); | |
705 | ||
706 | if (TREE_CODE (name) == TYPE_DECL) | |
707 | name = DECL_NAME (name); | |
708 | name = concat_name (name, "ALIGN"); | |
709 | TYPE_NAME (record_type) = name; | |
710 | ||
711 | /* Compute VOFFSET and then POS. The next byte position multiple of some | |
712 | alignment after some address is obtained by "and"ing the alignment minus | |
713 | 1 with the two's complement of the address. */ | |
714 | voffset_st = size_binop (BIT_AND_EXPR, | |
715 | fold_build1 (NEGATE_EXPR, sizetype, vblock_addr_st), | |
716 | size_int ((align / BITS_PER_UNIT) - 1)); | |
717 | ||
718 | /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */ | |
719 | pos = size_binop (MULT_EXPR, | |
720 | convert (bitsizetype, | |
721 | size_binop (PLUS_EXPR, room_st, voffset_st)), | |
722 | bitsize_unit_node); | |
723 | ||
724 | /* Craft the GCC record representation. We exceptionally do everything | |
725 | manually here because 1) our generic circuitry is not quite ready to | |
726 | handle the complex position/size expressions we are setting up, 2) we | |
727 | have a strong simplifying factor at hand: we know the maximum possible | |
728 | value of voffset, and 3) we have to set/reset at least the sizes in | |
729 | accordance with this maximum value anyway, as we need them to convey | |
730 | what should be "alloc"ated for this type. | |
731 | ||
732 | Use -1 as the 'addressable' indication for the field to prevent the | |
733 | creation of a bitfield. We don't need one, it would have damaging | |
734 | consequences on the alignment computation, and create_field_decl would | |
735 | make one without this special argument, for instance because of the | |
736 | complex position expression. */ | |
737 | field = create_field_decl (get_identifier ("F"), type, record_type, size, | |
738 | pos, 1, -1); | |
739 | TYPE_FIELDS (record_type) = field; | |
740 | ||
741 | TYPE_ALIGN (record_type) = base_align; | |
742 | TYPE_USER_ALIGN (record_type) = 1; | |
743 | ||
744 | TYPE_SIZE (record_type) | |
745 | = size_binop (PLUS_EXPR, | |
746 | size_binop (MULT_EXPR, convert (bitsizetype, size), | |
747 | bitsize_unit_node), | |
748 | bitsize_int (align + room * BITS_PER_UNIT)); | |
749 | TYPE_SIZE_UNIT (record_type) | |
750 | = size_binop (PLUS_EXPR, size, | |
751 | size_int (room + align / BITS_PER_UNIT)); | |
752 | ||
753 | SET_TYPE_MODE (record_type, BLKmode); | |
754 | relate_alias_sets (record_type, type, ALIAS_SET_COPY); | |
755 | ||
756 | /* Declare it now since it will never be declared otherwise. This is | |
757 | necessary to ensure that its subtrees are properly marked. */ | |
74746d49 | 758 | create_type_decl (name, record_type, true, false, gnat_node); |
842d4ee2 EB |
759 | |
760 | return record_type; | |
761 | } | |
762 | ||
763 | /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used | |
764 | as the field type of a packed record if IN_RECORD is true, or as the | |
765 | component type of a packed array if IN_RECORD is false. See if we can | |
766 | rewrite it either as a type that has a non-BLKmode, which we can pack | |
767 | tighter in the packed record case, or as a smaller type. If so, return | |
768 | the new type. If not, return the original type. */ | |
769 | ||
770 | tree | |
771 | make_packable_type (tree type, bool in_record) | |
772 | { | |
773 | unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1); | |
774 | unsigned HOST_WIDE_INT new_size; | |
775 | tree new_type, old_field, field_list = NULL_TREE; | |
776 | unsigned int align; | |
777 | ||
778 | /* No point in doing anything if the size is zero. */ | |
779 | if (size == 0) | |
780 | return type; | |
781 | ||
782 | new_type = make_node (TREE_CODE (type)); | |
783 | ||
784 | /* Copy the name and flags from the old type to that of the new. | |
785 | Note that we rely on the pointer equality created here for | |
786 | TYPE_NAME to look through conversions in various places. */ | |
787 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
788 | TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type); | |
789 | TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type); | |
790 | if (TREE_CODE (type) == RECORD_TYPE) | |
791 | TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type); | |
792 | ||
793 | /* If we are in a record and have a small size, set the alignment to | |
794 | try for an integral mode. Otherwise set it to try for a smaller | |
795 | type with BLKmode. */ | |
796 | if (in_record && size <= MAX_FIXED_MODE_SIZE) | |
797 | { | |
798 | align = ceil_pow2 (size); | |
799 | TYPE_ALIGN (new_type) = align; | |
800 | new_size = (size + align - 1) & -align; | |
801 | } | |
802 | else | |
803 | { | |
804 | unsigned HOST_WIDE_INT align; | |
805 | ||
806 | /* Do not try to shrink the size if the RM size is not constant. */ | |
807 | if (TYPE_CONTAINS_TEMPLATE_P (type) | |
808 | || !host_integerp (TYPE_ADA_SIZE (type), 1)) | |
809 | return type; | |
810 | ||
811 | /* Round the RM size up to a unit boundary to get the minimal size | |
812 | for a BLKmode record. Give up if it's already the size. */ | |
813 | new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type)); | |
814 | new_size = (new_size + BITS_PER_UNIT - 1) & -BITS_PER_UNIT; | |
815 | if (new_size == size) | |
816 | return type; | |
817 | ||
818 | align = new_size & -new_size; | |
819 | TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align); | |
820 | } | |
821 | ||
822 | TYPE_USER_ALIGN (new_type) = 1; | |
823 | ||
824 | /* Now copy the fields, keeping the position and size as we don't want | |
825 | to change the layout by propagating the packedness downwards. */ | |
826 | for (old_field = TYPE_FIELDS (type); old_field; | |
827 | old_field = DECL_CHAIN (old_field)) | |
828 | { | |
829 | tree new_field_type = TREE_TYPE (old_field); | |
830 | tree new_field, new_size; | |
831 | ||
832 | if (RECORD_OR_UNION_TYPE_P (new_field_type) | |
833 | && !TYPE_FAT_POINTER_P (new_field_type) | |
834 | && host_integerp (TYPE_SIZE (new_field_type), 1)) | |
835 | new_field_type = make_packable_type (new_field_type, true); | |
836 | ||
837 | /* However, for the last field in a not already packed record type | |
838 | that is of an aggregate type, we need to use the RM size in the | |
839 | packable version of the record type, see finish_record_type. */ | |
840 | if (!DECL_CHAIN (old_field) | |
841 | && !TYPE_PACKED (type) | |
842 | && RECORD_OR_UNION_TYPE_P (new_field_type) | |
843 | && !TYPE_FAT_POINTER_P (new_field_type) | |
844 | && !TYPE_CONTAINS_TEMPLATE_P (new_field_type) | |
845 | && TYPE_ADA_SIZE (new_field_type)) | |
846 | new_size = TYPE_ADA_SIZE (new_field_type); | |
847 | else | |
848 | new_size = DECL_SIZE (old_field); | |
849 | ||
850 | new_field | |
851 | = create_field_decl (DECL_NAME (old_field), new_field_type, new_type, | |
852 | new_size, bit_position (old_field), | |
853 | TYPE_PACKED (type), | |
854 | !DECL_NONADDRESSABLE_P (old_field)); | |
855 | ||
856 | DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); | |
857 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field); | |
858 | if (TREE_CODE (new_type) == QUAL_UNION_TYPE) | |
859 | DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field); | |
860 | ||
861 | DECL_CHAIN (new_field) = field_list; | |
862 | field_list = new_field; | |
863 | } | |
864 | ||
865 | finish_record_type (new_type, nreverse (field_list), 2, false); | |
866 | relate_alias_sets (new_type, type, ALIAS_SET_COPY); | |
867 | SET_DECL_PARALLEL_TYPE (TYPE_STUB_DECL (new_type), | |
868 | DECL_PARALLEL_TYPE (TYPE_STUB_DECL (type))); | |
869 | ||
870 | /* If this is a padding record, we never want to make the size smaller | |
871 | than what was specified. For QUAL_UNION_TYPE, also copy the size. */ | |
872 | if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE) | |
873 | { | |
874 | TYPE_SIZE (new_type) = TYPE_SIZE (type); | |
875 | TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type); | |
876 | new_size = size; | |
877 | } | |
878 | else | |
879 | { | |
880 | TYPE_SIZE (new_type) = bitsize_int (new_size); | |
881 | TYPE_SIZE_UNIT (new_type) | |
882 | = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT); | |
883 | } | |
884 | ||
885 | if (!TYPE_CONTAINS_TEMPLATE_P (type)) | |
886 | SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type)); | |
887 | ||
888 | compute_record_mode (new_type); | |
889 | ||
890 | /* Try harder to get a packable type if necessary, for example | |
891 | in case the record itself contains a BLKmode field. */ | |
892 | if (in_record && TYPE_MODE (new_type) == BLKmode) | |
893 | SET_TYPE_MODE (new_type, | |
894 | mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1)); | |
895 | ||
896 | /* If neither the mode nor the size has shrunk, return the old type. */ | |
897 | if (TYPE_MODE (new_type) == BLKmode && new_size >= size) | |
898 | return type; | |
899 | ||
900 | return new_type; | |
901 | } | |
902 | ||
903 | /* Given a type TYPE, return a new type whose size is appropriate for SIZE. | |
904 | If TYPE is the best type, return it. Otherwise, make a new type. We | |
905 | only support new integral and pointer types. FOR_BIASED is true if | |
906 | we are making a biased type. */ | |
907 | ||
908 | tree | |
909 | make_type_from_size (tree type, tree size_tree, bool for_biased) | |
910 | { | |
911 | unsigned HOST_WIDE_INT size; | |
912 | bool biased_p; | |
913 | tree new_type; | |
914 | ||
915 | /* If size indicates an error, just return TYPE to avoid propagating | |
916 | the error. Likewise if it's too large to represent. */ | |
917 | if (!size_tree || !host_integerp (size_tree, 1)) | |
918 | return type; | |
919 | ||
920 | size = tree_low_cst (size_tree, 1); | |
921 | ||
922 | switch (TREE_CODE (type)) | |
923 | { | |
924 | case INTEGER_TYPE: | |
925 | case ENUMERAL_TYPE: | |
926 | case BOOLEAN_TYPE: | |
927 | biased_p = (TREE_CODE (type) == INTEGER_TYPE | |
928 | && TYPE_BIASED_REPRESENTATION_P (type)); | |
929 | ||
930 | /* Integer types with precision 0 are forbidden. */ | |
931 | if (size == 0) | |
932 | size = 1; | |
933 | ||
934 | /* Only do something if the type isn't a packed array type and doesn't | |
935 | already have the proper size and the size isn't too large. */ | |
936 | if (TYPE_IS_PACKED_ARRAY_TYPE_P (type) | |
937 | || (TYPE_PRECISION (type) == size && biased_p == for_biased) | |
938 | || size > LONG_LONG_TYPE_SIZE) | |
939 | break; | |
940 | ||
941 | biased_p |= for_biased; | |
942 | if (TYPE_UNSIGNED (type) || biased_p) | |
943 | new_type = make_unsigned_type (size); | |
944 | else | |
945 | new_type = make_signed_type (size); | |
946 | TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type; | |
947 | SET_TYPE_RM_MIN_VALUE (new_type, | |
948 | convert (TREE_TYPE (new_type), | |
949 | TYPE_MIN_VALUE (type))); | |
950 | SET_TYPE_RM_MAX_VALUE (new_type, | |
951 | convert (TREE_TYPE (new_type), | |
952 | TYPE_MAX_VALUE (type))); | |
953 | /* Copy the name to show that it's essentially the same type and | |
954 | not a subrange type. */ | |
955 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
956 | TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p; | |
957 | SET_TYPE_RM_SIZE (new_type, bitsize_int (size)); | |
958 | return new_type; | |
959 | ||
960 | case RECORD_TYPE: | |
961 | /* Do something if this is a fat pointer, in which case we | |
962 | may need to return the thin pointer. */ | |
963 | if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2) | |
964 | { | |
965 | enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0); | |
966 | if (!targetm.valid_pointer_mode (p_mode)) | |
967 | p_mode = ptr_mode; | |
968 | return | |
969 | build_pointer_type_for_mode | |
970 | (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)), | |
971 | p_mode, 0); | |
972 | } | |
973 | break; | |
974 | ||
975 | case POINTER_TYPE: | |
976 | /* Only do something if this is a thin pointer, in which case we | |
977 | may need to return the fat pointer. */ | |
978 | if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2) | |
979 | return | |
980 | build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))); | |
981 | break; | |
982 | ||
983 | default: | |
984 | break; | |
985 | } | |
986 | ||
987 | return type; | |
988 | } | |
989 | ||
990 | /* See if the data pointed to by the hash table slot is marked. */ | |
991 | ||
992 | static int | |
993 | pad_type_hash_marked_p (const void *p) | |
994 | { | |
995 | const_tree const type = ((const struct pad_type_hash *) p)->type; | |
996 | ||
997 | return ggc_marked_p (type); | |
998 | } | |
999 | ||
1000 | /* Return the cached hash value. */ | |
1001 | ||
1002 | static hashval_t | |
1003 | pad_type_hash_hash (const void *p) | |
1004 | { | |
1005 | return ((const struct pad_type_hash *) p)->hash; | |
1006 | } | |
1007 | ||
1008 | /* Return 1 iff the padded types are equivalent. */ | |
1009 | ||
1010 | static int | |
1011 | pad_type_hash_eq (const void *p1, const void *p2) | |
1012 | { | |
1013 | const struct pad_type_hash *const t1 = (const struct pad_type_hash *) p1; | |
1014 | const struct pad_type_hash *const t2 = (const struct pad_type_hash *) p2; | |
1015 | tree type1, type2; | |
1016 | ||
1017 | if (t1->hash != t2->hash) | |
1018 | return 0; | |
1019 | ||
1020 | type1 = t1->type; | |
1021 | type2 = t2->type; | |
1022 | ||
1023 | /* We consider that the padded types are equivalent if they pad the same | |
1024 | type and have the same size, alignment and RM size. Taking the mode | |
1025 | into account is redundant since it is determined by the others. */ | |
1026 | return | |
1027 | TREE_TYPE (TYPE_FIELDS (type1)) == TREE_TYPE (TYPE_FIELDS (type2)) | |
1028 | && TYPE_SIZE (type1) == TYPE_SIZE (type2) | |
1029 | && TYPE_ALIGN (type1) == TYPE_ALIGN (type2) | |
1030 | && TYPE_ADA_SIZE (type1) == TYPE_ADA_SIZE (type2); | |
1031 | } | |
1032 | ||
1033 | /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type | |
1034 | if needed. We have already verified that SIZE and TYPE are large enough. | |
1035 | GNAT_ENTITY is used to name the resulting record and to issue a warning. | |
1036 | IS_COMPONENT_TYPE is true if this is being done for the component type of | |
1037 | an array. IS_USER_TYPE is true if the original type needs to be completed. | |
1038 | DEFINITION is true if this type is being defined. SET_RM_SIZE is true if | |
1039 | the RM size of the resulting type is to be set to SIZE too. */ | |
1040 | ||
1041 | tree | |
1042 | maybe_pad_type (tree type, tree size, unsigned int align, | |
1043 | Entity_Id gnat_entity, bool is_component_type, | |
1044 | bool is_user_type, bool definition, bool set_rm_size) | |
1045 | { | |
1046 | tree orig_size = TYPE_SIZE (type); | |
1047 | tree record, field; | |
1048 | ||
1049 | /* If TYPE is a padded type, see if it agrees with any size and alignment | |
1050 | we were given. If so, return the original type. Otherwise, strip | |
1051 | off the padding, since we will either be returning the inner type | |
1052 | or repadding it. If no size or alignment is specified, use that of | |
1053 | the original padded type. */ | |
1054 | if (TYPE_IS_PADDING_P (type)) | |
1055 | { | |
1056 | if ((!size | |
1057 | || operand_equal_p (round_up (size, | |
1058 | MAX (align, TYPE_ALIGN (type))), | |
1059 | round_up (TYPE_SIZE (type), | |
1060 | MAX (align, TYPE_ALIGN (type))), | |
1061 | 0)) | |
1062 | && (align == 0 || align == TYPE_ALIGN (type))) | |
1063 | return type; | |
1064 | ||
1065 | if (!size) | |
1066 | size = TYPE_SIZE (type); | |
1067 | if (align == 0) | |
1068 | align = TYPE_ALIGN (type); | |
1069 | ||
1070 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
1071 | orig_size = TYPE_SIZE (type); | |
1072 | } | |
1073 | ||
1074 | /* If the size is either not being changed or is being made smaller (which | |
1075 | is not done here and is only valid for bitfields anyway), show the size | |
1076 | isn't changing. Likewise, clear the alignment if it isn't being | |
1077 | changed. Then return if we aren't doing anything. */ | |
1078 | if (size | |
1079 | && (operand_equal_p (size, orig_size, 0) | |
1080 | || (TREE_CODE (orig_size) == INTEGER_CST | |
1081 | && tree_int_cst_lt (size, orig_size)))) | |
1082 | size = NULL_TREE; | |
1083 | ||
1084 | if (align == TYPE_ALIGN (type)) | |
1085 | align = 0; | |
1086 | ||
1087 | if (align == 0 && !size) | |
1088 | return type; | |
1089 | ||
1090 | /* If requested, complete the original type and give it a name. */ | |
1091 | if (is_user_type) | |
1092 | create_type_decl (get_entity_name (gnat_entity), type, | |
74746d49 | 1093 | !Comes_From_Source (gnat_entity), |
842d4ee2 EB |
1094 | !(TYPE_NAME (type) |
1095 | && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
1096 | && DECL_IGNORED_P (TYPE_NAME (type))), | |
1097 | gnat_entity); | |
1098 | ||
1099 | /* We used to modify the record in place in some cases, but that could | |
1100 | generate incorrect debugging information. So make a new record | |
1101 | type and name. */ | |
1102 | record = make_node (RECORD_TYPE); | |
1103 | TYPE_PADDING_P (record) = 1; | |
1104 | ||
1105 | if (Present (gnat_entity)) | |
1106 | TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD"); | |
1107 | ||
1108 | TYPE_ALIGN (record) = align; | |
1109 | TYPE_SIZE (record) = size ? size : orig_size; | |
1110 | TYPE_SIZE_UNIT (record) | |
1111 | = convert (sizetype, | |
1112 | size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record), | |
1113 | bitsize_unit_node)); | |
1114 | ||
1115 | /* If we are changing the alignment and the input type is a record with | |
1116 | BLKmode and a small constant size, try to make a form that has an | |
1117 | integral mode. This might allow the padding record to also have an | |
1118 | integral mode, which will be much more efficient. There is no point | |
1119 | in doing so if a size is specified unless it is also a small constant | |
1120 | size and it is incorrect to do so if we cannot guarantee that the mode | |
1121 | will be naturally aligned since the field must always be addressable. | |
1122 | ||
1123 | ??? This might not always be a win when done for a stand-alone object: | |
1124 | since the nominal and the effective type of the object will now have | |
1125 | different modes, a VIEW_CONVERT_EXPR will be required for converting | |
1126 | between them and it might be hard to overcome afterwards, including | |
1127 | at the RTL level when the stand-alone object is accessed as a whole. */ | |
1128 | if (align != 0 | |
1129 | && RECORD_OR_UNION_TYPE_P (type) | |
1130 | && TYPE_MODE (type) == BLKmode | |
1131 | && !TYPE_BY_REFERENCE_P (type) | |
1132 | && TREE_CODE (orig_size) == INTEGER_CST | |
1133 | && !TREE_OVERFLOW (orig_size) | |
1134 | && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0 | |
1135 | && (!size | |
1136 | || (TREE_CODE (size) == INTEGER_CST | |
1137 | && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0))) | |
1138 | { | |
1139 | tree packable_type = make_packable_type (type, true); | |
1140 | if (TYPE_MODE (packable_type) != BLKmode | |
1141 | && align >= TYPE_ALIGN (packable_type)) | |
1142 | type = packable_type; | |
1143 | } | |
1144 | ||
1145 | /* Now create the field with the original size. */ | |
1146 | field = create_field_decl (get_identifier ("F"), type, record, orig_size, | |
1147 | bitsize_zero_node, 0, 1); | |
1148 | DECL_INTERNAL_P (field) = 1; | |
1149 | ||
1150 | /* Do not emit debug info until after the auxiliary record is built. */ | |
1151 | finish_record_type (record, field, 1, false); | |
1152 | ||
1153 | /* Set the RM size if requested. */ | |
1154 | if (set_rm_size) | |
1155 | { | |
1156 | SET_TYPE_ADA_SIZE (record, size ? size : orig_size); | |
1157 | ||
1158 | /* If the padded type is complete and has constant size, we canonicalize | |
1159 | it by means of the hash table. This is consistent with the language | |
1160 | semantics and ensures that gigi and the middle-end have a common view | |
1161 | of these padded types. */ | |
1162 | if (TREE_CONSTANT (TYPE_SIZE (record))) | |
1163 | { | |
1164 | hashval_t hashcode; | |
1165 | struct pad_type_hash in, *h; | |
1166 | void **loc; | |
1167 | ||
1168 | hashcode = iterative_hash_object (TYPE_HASH (type), 0); | |
1169 | hashcode = iterative_hash_expr (TYPE_SIZE (record), hashcode); | |
1170 | hashcode = iterative_hash_hashval_t (TYPE_ALIGN (record), hashcode); | |
1171 | hashcode = iterative_hash_expr (TYPE_ADA_SIZE (record), hashcode); | |
1172 | ||
1173 | in.hash = hashcode; | |
1174 | in.type = record; | |
1175 | h = (struct pad_type_hash *) | |
1176 | htab_find_with_hash (pad_type_hash_table, &in, hashcode); | |
1177 | if (h) | |
1178 | { | |
1179 | record = h->type; | |
1180 | goto built; | |
1181 | } | |
1182 | ||
1183 | h = ggc_alloc_pad_type_hash (); | |
1184 | h->hash = hashcode; | |
1185 | h->type = record; | |
1186 | loc = htab_find_slot_with_hash (pad_type_hash_table, h, hashcode, | |
1187 | INSERT); | |
1188 | *loc = (void *)h; | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | /* Unless debugging information isn't being written for the input type, | |
1193 | write a record that shows what we are a subtype of and also make a | |
1194 | variable that indicates our size, if still variable. */ | |
1195 | if (TREE_CODE (orig_size) != INTEGER_CST | |
1196 | && TYPE_NAME (record) | |
1197 | && TYPE_NAME (type) | |
1198 | && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
1199 | && DECL_IGNORED_P (TYPE_NAME (type)))) | |
1200 | { | |
1201 | tree marker = make_node (RECORD_TYPE); | |
1202 | tree name = TYPE_NAME (record); | |
1203 | tree orig_name = TYPE_NAME (type); | |
1204 | ||
1205 | if (TREE_CODE (name) == TYPE_DECL) | |
1206 | name = DECL_NAME (name); | |
1207 | ||
1208 | if (TREE_CODE (orig_name) == TYPE_DECL) | |
1209 | orig_name = DECL_NAME (orig_name); | |
1210 | ||
1211 | TYPE_NAME (marker) = concat_name (name, "XVS"); | |
1212 | finish_record_type (marker, | |
1213 | create_field_decl (orig_name, | |
1214 | build_reference_type (type), | |
1215 | marker, NULL_TREE, NULL_TREE, | |
1216 | 0, 0), | |
1217 | 0, true); | |
1218 | ||
1219 | add_parallel_type (record, marker); | |
1220 | ||
1221 | if (definition && size && TREE_CODE (size) != INTEGER_CST) | |
1222 | TYPE_SIZE_UNIT (marker) | |
1223 | = create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype, | |
1224 | TYPE_SIZE_UNIT (record), false, false, false, | |
1225 | false, NULL, gnat_entity); | |
1226 | } | |
1227 | ||
1228 | rest_of_record_type_compilation (record); | |
1229 | ||
1230 | built: | |
1231 | /* If the size was widened explicitly, maybe give a warning. Take the | |
1232 | original size as the maximum size of the input if there was an | |
1233 | unconstrained record involved and round it up to the specified alignment, | |
1234 | if one was specified. But don't do it if we are just annotating types | |
1235 | and the type is tagged, since tagged types aren't fully laid out in this | |
1236 | mode. */ | |
1237 | if (!size | |
1238 | || TREE_CODE (size) == COND_EXPR | |
1239 | || TREE_CODE (size) == MAX_EXPR | |
1240 | || No (gnat_entity) | |
1241 | || (type_annotate_only && Is_Tagged_Type (Etype (gnat_entity)))) | |
1242 | return record; | |
1243 | ||
1244 | if (CONTAINS_PLACEHOLDER_P (orig_size)) | |
1245 | orig_size = max_size (orig_size, true); | |
1246 | ||
1247 | if (align) | |
1248 | orig_size = round_up (orig_size, align); | |
1249 | ||
1250 | if (!operand_equal_p (size, orig_size, 0) | |
1251 | && !(TREE_CODE (size) == INTEGER_CST | |
1252 | && TREE_CODE (orig_size) == INTEGER_CST | |
1253 | && (TREE_OVERFLOW (size) | |
1254 | || TREE_OVERFLOW (orig_size) | |
1255 | || tree_int_cst_lt (size, orig_size)))) | |
1256 | { | |
1257 | Node_Id gnat_error_node = Empty; | |
1258 | ||
1259 | if (Is_Packed_Array_Type (gnat_entity)) | |
1260 | gnat_entity = Original_Array_Type (gnat_entity); | |
1261 | ||
1262 | if ((Ekind (gnat_entity) == E_Component | |
1263 | || Ekind (gnat_entity) == E_Discriminant) | |
1264 | && Present (Component_Clause (gnat_entity))) | |
1265 | gnat_error_node = Last_Bit (Component_Clause (gnat_entity)); | |
1266 | else if (Present (Size_Clause (gnat_entity))) | |
1267 | gnat_error_node = Expression (Size_Clause (gnat_entity)); | |
1268 | ||
1269 | /* Generate message only for entities that come from source, since | |
1270 | if we have an entity created by expansion, the message will be | |
1271 | generated for some other corresponding source entity. */ | |
1272 | if (Comes_From_Source (gnat_entity)) | |
1273 | { | |
1274 | if (Present (gnat_error_node)) | |
1275 | post_error_ne_tree ("{^ }bits of & unused?", | |
1276 | gnat_error_node, gnat_entity, | |
1277 | size_diffop (size, orig_size)); | |
1278 | else if (is_component_type) | |
1279 | post_error_ne_tree ("component of& padded{ by ^ bits}?", | |
1280 | gnat_entity, gnat_entity, | |
1281 | size_diffop (size, orig_size)); | |
1282 | } | |
1283 | } | |
1284 | ||
1285 | return record; | |
1286 | } | |
1287 | \f | |
1288 | /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP. | |
1289 | If this is a multi-dimensional array type, do this recursively. | |
1290 | ||
1291 | OP may be | |
1292 | - ALIAS_SET_COPY: the new set is made a copy of the old one. | |
1293 | - ALIAS_SET_SUPERSET: the new set is made a superset of the old one. | |
1294 | - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */ | |
1295 | ||
1296 | void | |
1297 | relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op) | |
1298 | { | |
1299 | /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case | |
1300 | of a one-dimensional array, since the padding has the same alias set | |
1301 | as the field type, but if it's a multi-dimensional array, we need to | |
1302 | see the inner types. */ | |
1303 | while (TREE_CODE (gnu_old_type) == RECORD_TYPE | |
1304 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type) | |
1305 | || TYPE_PADDING_P (gnu_old_type))) | |
1306 | gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type)); | |
1307 | ||
1308 | /* Unconstrained array types are deemed incomplete and would thus be given | |
1309 | alias set 0. Retrieve the underlying array type. */ | |
1310 | if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE) | |
1311 | gnu_old_type | |
1312 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type)))); | |
1313 | if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE) | |
1314 | gnu_new_type | |
1315 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type)))); | |
1316 | ||
1317 | if (TREE_CODE (gnu_new_type) == ARRAY_TYPE | |
1318 | && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE | |
1319 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type))) | |
1320 | relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op); | |
1321 | ||
1322 | switch (op) | |
1323 | { | |
1324 | case ALIAS_SET_COPY: | |
1325 | /* The alias set shouldn't be copied between array types with different | |
1326 | aliasing settings because this can break the aliasing relationship | |
1327 | between the array type and its element type. */ | |
1328 | #ifndef ENABLE_CHECKING | |
1329 | if (flag_strict_aliasing) | |
1330 | #endif | |
1331 | gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE | |
1332 | && TREE_CODE (gnu_old_type) == ARRAY_TYPE | |
1333 | && TYPE_NONALIASED_COMPONENT (gnu_new_type) | |
1334 | != TYPE_NONALIASED_COMPONENT (gnu_old_type))); | |
1335 | ||
1336 | TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type); | |
1337 | break; | |
1338 | ||
1339 | case ALIAS_SET_SUBSET: | |
1340 | case ALIAS_SET_SUPERSET: | |
1341 | { | |
1342 | alias_set_type old_set = get_alias_set (gnu_old_type); | |
1343 | alias_set_type new_set = get_alias_set (gnu_new_type); | |
1344 | ||
1345 | /* Do nothing if the alias sets conflict. This ensures that we | |
1346 | never call record_alias_subset several times for the same pair | |
1347 | or at all for alias set 0. */ | |
1348 | if (!alias_sets_conflict_p (old_set, new_set)) | |
1349 | { | |
1350 | if (op == ALIAS_SET_SUBSET) | |
1351 | record_alias_subset (old_set, new_set); | |
1352 | else | |
1353 | record_alias_subset (new_set, old_set); | |
1354 | } | |
1355 | } | |
1356 | break; | |
1357 | ||
1358 | default: | |
1359 | gcc_unreachable (); | |
1360 | } | |
1361 | ||
1362 | record_component_aliases (gnu_new_type); | |
1363 | } | |
1364 | \f | |
1aeb40dd EB |
1365 | /* Record TYPE as a builtin type for Ada. NAME is the name of the type. |
1366 | ARTIFICIAL_P is true if it's a type that was generated by the compiler. */ | |
a1ab4c31 AC |
1367 | |
1368 | void | |
1aeb40dd | 1369 | record_builtin_type (const char *name, tree type, bool artificial_p) |
a1ab4c31 | 1370 | { |
c172df28 AH |
1371 | tree type_decl = build_decl (input_location, |
1372 | TYPE_DECL, get_identifier (name), type); | |
1aeb40dd | 1373 | DECL_ARTIFICIAL (type_decl) = artificial_p; |
bc712852 | 1374 | TYPE_ARTIFICIAL (type) = artificial_p; |
10069d53 | 1375 | gnat_pushdecl (type_decl, Empty); |
a1ab4c31 | 1376 | |
10069d53 EB |
1377 | if (debug_hooks->type_decl) |
1378 | debug_hooks->type_decl (type_decl, false); | |
a1ab4c31 AC |
1379 | } |
1380 | \f | |
e3edbd56 EB |
1381 | /* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST, |
1382 | finish constructing the record type as a fat pointer type. */ | |
1383 | ||
1384 | void | |
1385 | finish_fat_pointer_type (tree record_type, tree field_list) | |
1386 | { | |
1387 | /* Make sure we can put it into a register. */ | |
5da8c011 EB |
1388 | if (STRICT_ALIGNMENT) |
1389 | TYPE_ALIGN (record_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE); | |
e3edbd56 EB |
1390 | |
1391 | /* Show what it really is. */ | |
1392 | TYPE_FAT_POINTER_P (record_type) = 1; | |
1393 | ||
1394 | /* Do not emit debug info for it since the types of its fields may still be | |
1395 | incomplete at this point. */ | |
1396 | finish_record_type (record_type, field_list, 0, false); | |
1397 | ||
1398 | /* Force type_contains_placeholder_p to return true on it. Although the | |
1399 | PLACEHOLDER_EXPRs are referenced only indirectly, this isn't a pointer | |
1400 | type but the representation of the unconstrained array. */ | |
1401 | TYPE_CONTAINS_PLACEHOLDER_INTERNAL (record_type) = 2; | |
1402 | } | |
1403 | ||
032d1b71 | 1404 | /* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST, |
a1ab4c31 AC |
1405 | finish constructing the record or union type. If REP_LEVEL is zero, this |
1406 | record has no representation clause and so will be entirely laid out here. | |
1407 | If REP_LEVEL is one, this record has a representation clause and has been | |
1408 | laid out already; only set the sizes and alignment. If REP_LEVEL is two, | |
1409 | this record is derived from a parent record and thus inherits its layout; | |
032d1b71 EB |
1410 | only make a pass on the fields to finalize them. DEBUG_INFO_P is true if |
1411 | we need to write debug information about this type. */ | |
a1ab4c31 AC |
1412 | |
1413 | void | |
032d1b71 EB |
1414 | finish_record_type (tree record_type, tree field_list, int rep_level, |
1415 | bool debug_info_p) | |
a1ab4c31 AC |
1416 | { |
1417 | enum tree_code code = TREE_CODE (record_type); | |
1418 | tree name = TYPE_NAME (record_type); | |
1419 | tree ada_size = bitsize_zero_node; | |
1420 | tree size = bitsize_zero_node; | |
1421 | bool had_size = TYPE_SIZE (record_type) != 0; | |
1422 | bool had_size_unit = TYPE_SIZE_UNIT (record_type) != 0; | |
1423 | bool had_align = TYPE_ALIGN (record_type) != 0; | |
1424 | tree field; | |
1425 | ||
032d1b71 | 1426 | TYPE_FIELDS (record_type) = field_list; |
a1ab4c31 | 1427 | |
10069d53 EB |
1428 | /* Always attach the TYPE_STUB_DECL for a record type. It is required to |
1429 | generate debug info and have a parallel type. */ | |
1430 | if (name && TREE_CODE (name) == TYPE_DECL) | |
1431 | name = DECL_NAME (name); | |
1432 | TYPE_STUB_DECL (record_type) = create_type_stub_decl (name, record_type); | |
a1ab4c31 AC |
1433 | |
1434 | /* Globally initialize the record first. If this is a rep'ed record, | |
1435 | that just means some initializations; otherwise, layout the record. */ | |
1436 | if (rep_level > 0) | |
1437 | { | |
1438 | TYPE_ALIGN (record_type) = MAX (BITS_PER_UNIT, TYPE_ALIGN (record_type)); | |
a1ab4c31 AC |
1439 | |
1440 | if (!had_size_unit) | |
1441 | TYPE_SIZE_UNIT (record_type) = size_zero_node; | |
b1fa9126 | 1442 | |
a1ab4c31 AC |
1443 | if (!had_size) |
1444 | TYPE_SIZE (record_type) = bitsize_zero_node; | |
1445 | ||
1446 | /* For all-repped records with a size specified, lay the QUAL_UNION_TYPE | |
1447 | out just like a UNION_TYPE, since the size will be fixed. */ | |
1448 | else if (code == QUAL_UNION_TYPE) | |
1449 | code = UNION_TYPE; | |
1450 | } | |
1451 | else | |
1452 | { | |
1453 | /* Ensure there isn't a size already set. There can be in an error | |
1454 | case where there is a rep clause but all fields have errors and | |
1455 | no longer have a position. */ | |
1456 | TYPE_SIZE (record_type) = 0; | |
bb358f1c EB |
1457 | |
1458 | /* Ensure we use the traditional GCC layout for bitfields when we need | |
1459 | to pack the record type or have a representation clause. The other | |
1460 | possible layout (Microsoft C compiler), if available, would prevent | |
1461 | efficient packing in almost all cases. */ | |
1462 | #ifdef TARGET_MS_BITFIELD_LAYOUT | |
1463 | if (TARGET_MS_BITFIELD_LAYOUT && TYPE_PACKED (record_type)) | |
1464 | decl_attributes (&record_type, | |
1465 | tree_cons (get_identifier ("gcc_struct"), | |
1466 | NULL_TREE, NULL_TREE), | |
1467 | ATTR_FLAG_TYPE_IN_PLACE); | |
1468 | #endif | |
1469 | ||
a1ab4c31 AC |
1470 | layout_type (record_type); |
1471 | } | |
1472 | ||
1473 | /* At this point, the position and size of each field is known. It was | |
1474 | either set before entry by a rep clause, or by laying out the type above. | |
1475 | ||
1476 | We now run a pass over the fields (in reverse order for QUAL_UNION_TYPEs) | |
1477 | to compute the Ada size; the GCC size and alignment (for rep'ed records | |
1478 | that are not padding types); and the mode (for rep'ed records). We also | |
1479 | clear the DECL_BIT_FIELD indication for the cases we know have not been | |
1480 | handled yet, and adjust DECL_NONADDRESSABLE_P accordingly. */ | |
1481 | ||
1482 | if (code == QUAL_UNION_TYPE) | |
032d1b71 | 1483 | field_list = nreverse (field_list); |
a1ab4c31 | 1484 | |
910ad8de | 1485 | for (field = field_list; field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
1486 | { |
1487 | tree type = TREE_TYPE (field); | |
1488 | tree pos = bit_position (field); | |
1489 | tree this_size = DECL_SIZE (field); | |
1490 | tree this_ada_size; | |
1491 | ||
e1e5852c | 1492 | if (RECORD_OR_UNION_TYPE_P (type) |
315cff15 | 1493 | && !TYPE_FAT_POINTER_P (type) |
a1ab4c31 AC |
1494 | && !TYPE_CONTAINS_TEMPLATE_P (type) |
1495 | && TYPE_ADA_SIZE (type)) | |
1496 | this_ada_size = TYPE_ADA_SIZE (type); | |
1497 | else | |
1498 | this_ada_size = this_size; | |
1499 | ||
1500 | /* Clear DECL_BIT_FIELD for the cases layout_decl does not handle. */ | |
1501 | if (DECL_BIT_FIELD (field) | |
1502 | && operand_equal_p (this_size, TYPE_SIZE (type), 0)) | |
1503 | { | |
1504 | unsigned int align = TYPE_ALIGN (type); | |
1505 | ||
1506 | /* In the general case, type alignment is required. */ | |
1507 | if (value_factor_p (pos, align)) | |
1508 | { | |
1509 | /* The enclosing record type must be sufficiently aligned. | |
1510 | Otherwise, if no alignment was specified for it and it | |
1511 | has been laid out already, bump its alignment to the | |
1512 | desired one if this is compatible with its size. */ | |
1513 | if (TYPE_ALIGN (record_type) >= align) | |
1514 | { | |
1515 | DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align); | |
1516 | DECL_BIT_FIELD (field) = 0; | |
1517 | } | |
1518 | else if (!had_align | |
1519 | && rep_level == 0 | |
1520 | && value_factor_p (TYPE_SIZE (record_type), align)) | |
1521 | { | |
1522 | TYPE_ALIGN (record_type) = align; | |
1523 | DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align); | |
1524 | DECL_BIT_FIELD (field) = 0; | |
1525 | } | |
1526 | } | |
1527 | ||
1528 | /* In the non-strict alignment case, only byte alignment is. */ | |
1529 | if (!STRICT_ALIGNMENT | |
1530 | && DECL_BIT_FIELD (field) | |
1531 | && value_factor_p (pos, BITS_PER_UNIT)) | |
1532 | DECL_BIT_FIELD (field) = 0; | |
1533 | } | |
1534 | ||
c1abd261 EB |
1535 | /* If we still have DECL_BIT_FIELD set at this point, we know that the |
1536 | field is technically not addressable. Except that it can actually | |
1537 | be addressed if it is BLKmode and happens to be properly aligned. */ | |
1538 | if (DECL_BIT_FIELD (field) | |
1539 | && !(DECL_MODE (field) == BLKmode | |
1540 | && value_factor_p (pos, BITS_PER_UNIT))) | |
1541 | DECL_NONADDRESSABLE_P (field) = 1; | |
a1ab4c31 AC |
1542 | |
1543 | /* A type must be as aligned as its most aligned field that is not | |
1544 | a bit-field. But this is already enforced by layout_type. */ | |
1545 | if (rep_level > 0 && !DECL_BIT_FIELD (field)) | |
1546 | TYPE_ALIGN (record_type) | |
1547 | = MAX (TYPE_ALIGN (record_type), DECL_ALIGN (field)); | |
1548 | ||
1549 | switch (code) | |
1550 | { | |
1551 | case UNION_TYPE: | |
1552 | ada_size = size_binop (MAX_EXPR, ada_size, this_ada_size); | |
1553 | size = size_binop (MAX_EXPR, size, this_size); | |
1554 | break; | |
1555 | ||
1556 | case QUAL_UNION_TYPE: | |
1557 | ada_size | |
1558 | = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field), | |
1559 | this_ada_size, ada_size); | |
1560 | size = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field), | |
1561 | this_size, size); | |
1562 | break; | |
1563 | ||
1564 | case RECORD_TYPE: | |
1565 | /* Since we know here that all fields are sorted in order of | |
1566 | increasing bit position, the size of the record is one | |
1567 | higher than the ending bit of the last field processed | |
1568 | unless we have a rep clause, since in that case we might | |
1569 | have a field outside a QUAL_UNION_TYPE that has a higher ending | |
1570 | position. So use a MAX in that case. Also, if this field is a | |
1571 | QUAL_UNION_TYPE, we need to take into account the previous size in | |
1572 | the case of empty variants. */ | |
1573 | ada_size | |
1574 | = merge_sizes (ada_size, pos, this_ada_size, | |
1575 | TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0); | |
1576 | size | |
1577 | = merge_sizes (size, pos, this_size, | |
1578 | TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0); | |
1579 | break; | |
1580 | ||
1581 | default: | |
1582 | gcc_unreachable (); | |
1583 | } | |
1584 | } | |
1585 | ||
1586 | if (code == QUAL_UNION_TYPE) | |
032d1b71 | 1587 | nreverse (field_list); |
a1ab4c31 AC |
1588 | |
1589 | if (rep_level < 2) | |
1590 | { | |
1591 | /* If this is a padding record, we never want to make the size smaller | |
1592 | than what was specified in it, if any. */ | |
315cff15 | 1593 | if (TYPE_IS_PADDING_P (record_type) && TYPE_SIZE (record_type)) |
a1ab4c31 AC |
1594 | size = TYPE_SIZE (record_type); |
1595 | ||
1596 | /* Now set any of the values we've just computed that apply. */ | |
315cff15 | 1597 | if (!TYPE_FAT_POINTER_P (record_type) |
a1ab4c31 AC |
1598 | && !TYPE_CONTAINS_TEMPLATE_P (record_type)) |
1599 | SET_TYPE_ADA_SIZE (record_type, ada_size); | |
1600 | ||
1601 | if (rep_level > 0) | |
1602 | { | |
1603 | tree size_unit = had_size_unit | |
1604 | ? TYPE_SIZE_UNIT (record_type) | |
1605 | : convert (sizetype, | |
1606 | size_binop (CEIL_DIV_EXPR, size, | |
1607 | bitsize_unit_node)); | |
1608 | unsigned int align = TYPE_ALIGN (record_type); | |
1609 | ||
1610 | TYPE_SIZE (record_type) = variable_size (round_up (size, align)); | |
1611 | TYPE_SIZE_UNIT (record_type) | |
1612 | = variable_size (round_up (size_unit, align / BITS_PER_UNIT)); | |
1613 | ||
1614 | compute_record_mode (record_type); | |
1615 | } | |
1616 | } | |
1617 | ||
032d1b71 | 1618 | if (debug_info_p) |
a1ab4c31 AC |
1619 | rest_of_record_type_compilation (record_type); |
1620 | } | |
1621 | ||
a5695aa2 EB |
1622 | /* Append PARALLEL_TYPE on the chain of parallel types of TYPE. */ |
1623 | ||
1624 | void | |
1625 | add_parallel_type (tree type, tree parallel_type) | |
1626 | { | |
1627 | tree decl = TYPE_STUB_DECL (type); | |
1628 | ||
1629 | while (DECL_PARALLEL_TYPE (decl)) | |
1630 | decl = TYPE_STUB_DECL (DECL_PARALLEL_TYPE (decl)); | |
1631 | ||
1632 | SET_DECL_PARALLEL_TYPE (decl, parallel_type); | |
1633 | } | |
1634 | ||
1635 | /* Return true if TYPE has a parallel type. */ | |
1636 | ||
1637 | static bool | |
1638 | has_parallel_type (tree type) | |
1639 | { | |
1640 | tree decl = TYPE_STUB_DECL (type); | |
1641 | ||
1642 | return DECL_PARALLEL_TYPE (decl) != NULL_TREE; | |
1643 | } | |
1644 | ||
032d1b71 EB |
1645 | /* Wrap up compilation of RECORD_TYPE, i.e. output all the debug information |
1646 | associated with it. It need not be invoked directly in most cases since | |
1647 | finish_record_type takes care of doing so, but this can be necessary if | |
1648 | a parallel type is to be attached to the record type. */ | |
a1ab4c31 AC |
1649 | |
1650 | void | |
1651 | rest_of_record_type_compilation (tree record_type) | |
1652 | { | |
a1ab4c31 | 1653 | bool var_size = false; |
fb88e1dd | 1654 | tree field; |
a1ab4c31 | 1655 | |
fb88e1dd EB |
1656 | /* If this is a padded type, the bulk of the debug info has already been |
1657 | generated for the field's type. */ | |
1658 | if (TYPE_IS_PADDING_P (record_type)) | |
1659 | return; | |
1660 | ||
a5695aa2 EB |
1661 | /* If the type already has a parallel type (XVS type), then we're done. */ |
1662 | if (has_parallel_type (record_type)) | |
1663 | return; | |
1664 | ||
fb88e1dd | 1665 | for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
1666 | { |
1667 | /* We need to make an XVE/XVU record if any field has variable size, | |
1668 | whether or not the record does. For example, if we have a union, | |
1669 | it may be that all fields, rounded up to the alignment, have the | |
1670 | same size, in which case we'll use that size. But the debug | |
1671 | output routines (except Dwarf2) won't be able to output the fields, | |
1672 | so we need to make the special record. */ | |
1673 | if (TREE_CODE (DECL_SIZE (field)) != INTEGER_CST | |
1674 | /* If a field has a non-constant qualifier, the record will have | |
1675 | variable size too. */ | |
fb88e1dd | 1676 | || (TREE_CODE (record_type) == QUAL_UNION_TYPE |
a1ab4c31 AC |
1677 | && TREE_CODE (DECL_QUALIFIER (field)) != INTEGER_CST)) |
1678 | { | |
1679 | var_size = true; | |
1680 | break; | |
1681 | } | |
1682 | } | |
1683 | ||
fb88e1dd EB |
1684 | /* If this record type is of variable size, make a parallel record type that |
1685 | will tell the debugger how the former is laid out (see exp_dbug.ads). */ | |
1686 | if (var_size) | |
a1ab4c31 AC |
1687 | { |
1688 | tree new_record_type | |
1689 | = make_node (TREE_CODE (record_type) == QUAL_UNION_TYPE | |
1690 | ? UNION_TYPE : TREE_CODE (record_type)); | |
0fb2335d | 1691 | tree orig_name = TYPE_NAME (record_type), new_name; |
a1ab4c31 | 1692 | tree last_pos = bitsize_zero_node; |
0fb2335d | 1693 | tree old_field, prev_old_field = NULL_TREE; |
a1ab4c31 | 1694 | |
0fb2335d EB |
1695 | if (TREE_CODE (orig_name) == TYPE_DECL) |
1696 | orig_name = DECL_NAME (orig_name); | |
1697 | ||
1698 | new_name | |
1699 | = concat_name (orig_name, TREE_CODE (record_type) == QUAL_UNION_TYPE | |
1700 | ? "XVU" : "XVE"); | |
1701 | TYPE_NAME (new_record_type) = new_name; | |
a1ab4c31 AC |
1702 | TYPE_ALIGN (new_record_type) = BIGGEST_ALIGNMENT; |
1703 | TYPE_STUB_DECL (new_record_type) | |
0fb2335d | 1704 | = create_type_stub_decl (new_name, new_record_type); |
a1ab4c31 AC |
1705 | DECL_IGNORED_P (TYPE_STUB_DECL (new_record_type)) |
1706 | = DECL_IGNORED_P (TYPE_STUB_DECL (record_type)); | |
1707 | TYPE_SIZE (new_record_type) = size_int (TYPE_ALIGN (record_type)); | |
1708 | TYPE_SIZE_UNIT (new_record_type) | |
1709 | = size_int (TYPE_ALIGN (record_type) / BITS_PER_UNIT); | |
1710 | ||
a1ab4c31 AC |
1711 | /* Now scan all the fields, replacing each field with a new |
1712 | field corresponding to the new encoding. */ | |
1713 | for (old_field = TYPE_FIELDS (record_type); old_field; | |
910ad8de | 1714 | old_field = DECL_CHAIN (old_field)) |
a1ab4c31 AC |
1715 | { |
1716 | tree field_type = TREE_TYPE (old_field); | |
1717 | tree field_name = DECL_NAME (old_field); | |
1718 | tree new_field; | |
1719 | tree curpos = bit_position (old_field); | |
1720 | bool var = false; | |
1721 | unsigned int align = 0; | |
1722 | tree pos; | |
1723 | ||
1724 | /* See how the position was modified from the last position. | |
1725 | ||
1726 | There are two basic cases we support: a value was added | |
1727 | to the last position or the last position was rounded to | |
1728 | a boundary and they something was added. Check for the | |
1729 | first case first. If not, see if there is any evidence | |
1730 | of rounding. If so, round the last position and try | |
1731 | again. | |
1732 | ||
1733 | If this is a union, the position can be taken as zero. */ | |
1734 | ||
1735 | /* Some computations depend on the shape of the position expression, | |
1736 | so strip conversions to make sure it's exposed. */ | |
1737 | curpos = remove_conversions (curpos, true); | |
1738 | ||
1739 | if (TREE_CODE (new_record_type) == UNION_TYPE) | |
1740 | pos = bitsize_zero_node, align = 0; | |
1741 | else | |
1742 | pos = compute_related_constant (curpos, last_pos); | |
1743 | ||
1744 | if (!pos && TREE_CODE (curpos) == MULT_EXPR | |
1745 | && host_integerp (TREE_OPERAND (curpos, 1), 1)) | |
1746 | { | |
1747 | tree offset = TREE_OPERAND (curpos, 0); | |
1748 | align = tree_low_cst (TREE_OPERAND (curpos, 1), 1); | |
1749 | ||
f58e663b EB |
1750 | /* An offset which is a bitwise AND with a mask increases the |
1751 | alignment according to the number of trailing zeros. */ | |
a1ab4c31 AC |
1752 | offset = remove_conversions (offset, true); |
1753 | if (TREE_CODE (offset) == BIT_AND_EXPR | |
f58e663b | 1754 | && TREE_CODE (TREE_OPERAND (offset, 1)) == INTEGER_CST) |
a1ab4c31 | 1755 | { |
f58e663b EB |
1756 | unsigned HOST_WIDE_INT mask |
1757 | = TREE_INT_CST_LOW (TREE_OPERAND (offset, 1)); | |
1758 | unsigned int i; | |
1759 | ||
1760 | for (i = 0; i < HOST_BITS_PER_WIDE_INT; i++) | |
1761 | { | |
1762 | if (mask & 1) | |
1763 | break; | |
1764 | mask >>= 1; | |
1765 | align *= 2; | |
1766 | } | |
a1ab4c31 AC |
1767 | } |
1768 | ||
1769 | pos = compute_related_constant (curpos, | |
1770 | round_up (last_pos, align)); | |
1771 | } | |
1772 | else if (!pos && TREE_CODE (curpos) == PLUS_EXPR | |
1773 | && TREE_CODE (TREE_OPERAND (curpos, 1)) == INTEGER_CST | |
1774 | && TREE_CODE (TREE_OPERAND (curpos, 0)) == MULT_EXPR | |
1775 | && host_integerp (TREE_OPERAND | |
1776 | (TREE_OPERAND (curpos, 0), 1), | |
1777 | 1)) | |
1778 | { | |
1779 | align | |
1780 | = tree_low_cst | |
1781 | (TREE_OPERAND (TREE_OPERAND (curpos, 0), 1), 1); | |
1782 | pos = compute_related_constant (curpos, | |
1783 | round_up (last_pos, align)); | |
1784 | } | |
1785 | else if (potential_alignment_gap (prev_old_field, old_field, | |
1786 | pos)) | |
1787 | { | |
1788 | align = TYPE_ALIGN (field_type); | |
1789 | pos = compute_related_constant (curpos, | |
1790 | round_up (last_pos, align)); | |
1791 | } | |
1792 | ||
1793 | /* If we can't compute a position, set it to zero. | |
1794 | ||
1795 | ??? We really should abort here, but it's too much work | |
1796 | to get this correct for all cases. */ | |
1797 | ||
1798 | if (!pos) | |
1799 | pos = bitsize_zero_node; | |
1800 | ||
1801 | /* See if this type is variable-sized and make a pointer type | |
1802 | and indicate the indirection if so. Beware that the debug | |
1803 | back-end may adjust the position computed above according | |
1804 | to the alignment of the field type, i.e. the pointer type | |
1805 | in this case, if we don't preventively counter that. */ | |
1806 | if (TREE_CODE (DECL_SIZE (old_field)) != INTEGER_CST) | |
1807 | { | |
1808 | field_type = build_pointer_type (field_type); | |
1809 | if (align != 0 && TYPE_ALIGN (field_type) > align) | |
1810 | { | |
1811 | field_type = copy_node (field_type); | |
1812 | TYPE_ALIGN (field_type) = align; | |
1813 | } | |
1814 | var = true; | |
1815 | } | |
1816 | ||
1817 | /* Make a new field name, if necessary. */ | |
1818 | if (var || align != 0) | |
1819 | { | |
1820 | char suffix[16]; | |
1821 | ||
1822 | if (align != 0) | |
1823 | sprintf (suffix, "XV%c%u", var ? 'L' : 'A', | |
1824 | align / BITS_PER_UNIT); | |
1825 | else | |
1826 | strcpy (suffix, "XVL"); | |
1827 | ||
0fb2335d | 1828 | field_name = concat_name (field_name, suffix); |
a1ab4c31 AC |
1829 | } |
1830 | ||
da01bfee EB |
1831 | new_field |
1832 | = create_field_decl (field_name, field_type, new_record_type, | |
1833 | DECL_SIZE (old_field), pos, 0, 0); | |
910ad8de | 1834 | DECL_CHAIN (new_field) = TYPE_FIELDS (new_record_type); |
a1ab4c31 AC |
1835 | TYPE_FIELDS (new_record_type) = new_field; |
1836 | ||
1837 | /* If old_field is a QUAL_UNION_TYPE, take its size as being | |
1838 | zero. The only time it's not the last field of the record | |
1839 | is when there are other components at fixed positions after | |
1840 | it (meaning there was a rep clause for every field) and we | |
1841 | want to be able to encode them. */ | |
1842 | last_pos = size_binop (PLUS_EXPR, bit_position (old_field), | |
1843 | (TREE_CODE (TREE_TYPE (old_field)) | |
1844 | == QUAL_UNION_TYPE) | |
1845 | ? bitsize_zero_node | |
1846 | : DECL_SIZE (old_field)); | |
1847 | prev_old_field = old_field; | |
1848 | } | |
1849 | ||
fb88e1dd | 1850 | TYPE_FIELDS (new_record_type) = nreverse (TYPE_FIELDS (new_record_type)); |
a1ab4c31 | 1851 | |
a5695aa2 | 1852 | add_parallel_type (record_type, new_record_type); |
a1ab4c31 | 1853 | } |
a1ab4c31 AC |
1854 | } |
1855 | ||
a1ab4c31 | 1856 | /* Utility function of above to merge LAST_SIZE, the previous size of a record |
1e17ef87 EB |
1857 | with FIRST_BIT and SIZE that describe a field. SPECIAL is true if this |
1858 | represents a QUAL_UNION_TYPE in which case we must look for COND_EXPRs and | |
1859 | replace a value of zero with the old size. If HAS_REP is true, we take the | |
1860 | MAX of the end position of this field with LAST_SIZE. In all other cases, | |
1861 | we use FIRST_BIT plus SIZE. Return an expression for the size. */ | |
a1ab4c31 AC |
1862 | |
1863 | static tree | |
1864 | merge_sizes (tree last_size, tree first_bit, tree size, bool special, | |
1865 | bool has_rep) | |
1866 | { | |
1867 | tree type = TREE_TYPE (last_size); | |
c6bd4220 | 1868 | tree new_size; |
a1ab4c31 AC |
1869 | |
1870 | if (!special || TREE_CODE (size) != COND_EXPR) | |
1871 | { | |
c6bd4220 | 1872 | new_size = size_binop (PLUS_EXPR, first_bit, size); |
a1ab4c31 | 1873 | if (has_rep) |
c6bd4220 | 1874 | new_size = size_binop (MAX_EXPR, last_size, new_size); |
a1ab4c31 AC |
1875 | } |
1876 | ||
1877 | else | |
c6bd4220 EB |
1878 | new_size = fold_build3 (COND_EXPR, type, TREE_OPERAND (size, 0), |
1879 | integer_zerop (TREE_OPERAND (size, 1)) | |
1880 | ? last_size : merge_sizes (last_size, first_bit, | |
1881 | TREE_OPERAND (size, 1), | |
1882 | 1, has_rep), | |
1883 | integer_zerop (TREE_OPERAND (size, 2)) | |
1884 | ? last_size : merge_sizes (last_size, first_bit, | |
1885 | TREE_OPERAND (size, 2), | |
1886 | 1, has_rep)); | |
a1ab4c31 AC |
1887 | |
1888 | /* We don't need any NON_VALUE_EXPRs and they can confuse us (especially | |
1889 | when fed through substitute_in_expr) into thinking that a constant | |
1890 | size is not constant. */ | |
c6bd4220 EB |
1891 | while (TREE_CODE (new_size) == NON_LVALUE_EXPR) |
1892 | new_size = TREE_OPERAND (new_size, 0); | |
a1ab4c31 | 1893 | |
c6bd4220 | 1894 | return new_size; |
a1ab4c31 AC |
1895 | } |
1896 | ||
1897 | /* Utility function of above to see if OP0 and OP1, both of SIZETYPE, are | |
1898 | related by the addition of a constant. Return that constant if so. */ | |
1899 | ||
1900 | static tree | |
1901 | compute_related_constant (tree op0, tree op1) | |
1902 | { | |
1903 | tree op0_var, op1_var; | |
1904 | tree op0_con = split_plus (op0, &op0_var); | |
1905 | tree op1_con = split_plus (op1, &op1_var); | |
1906 | tree result = size_binop (MINUS_EXPR, op0_con, op1_con); | |
1907 | ||
1908 | if (operand_equal_p (op0_var, op1_var, 0)) | |
1909 | return result; | |
1910 | else if (operand_equal_p (op0, size_binop (PLUS_EXPR, op1_var, result), 0)) | |
1911 | return result; | |
1912 | else | |
1913 | return 0; | |
1914 | } | |
1915 | ||
1916 | /* Utility function of above to split a tree OP which may be a sum, into a | |
1917 | constant part, which is returned, and a variable part, which is stored | |
1918 | in *PVAR. *PVAR may be bitsize_zero_node. All operations must be of | |
1919 | bitsizetype. */ | |
1920 | ||
1921 | static tree | |
1922 | split_plus (tree in, tree *pvar) | |
1923 | { | |
722356ce EB |
1924 | /* Strip conversions in order to ease the tree traversal and maximize the |
1925 | potential for constant or plus/minus discovery. We need to be careful | |
a1ab4c31 AC |
1926 | to always return and set *pvar to bitsizetype trees, but it's worth |
1927 | the effort. */ | |
722356ce | 1928 | in = remove_conversions (in, false); |
a1ab4c31 AC |
1929 | |
1930 | *pvar = convert (bitsizetype, in); | |
1931 | ||
1932 | if (TREE_CODE (in) == INTEGER_CST) | |
1933 | { | |
1934 | *pvar = bitsize_zero_node; | |
1935 | return convert (bitsizetype, in); | |
1936 | } | |
1937 | else if (TREE_CODE (in) == PLUS_EXPR || TREE_CODE (in) == MINUS_EXPR) | |
1938 | { | |
1939 | tree lhs_var, rhs_var; | |
1940 | tree lhs_con = split_plus (TREE_OPERAND (in, 0), &lhs_var); | |
1941 | tree rhs_con = split_plus (TREE_OPERAND (in, 1), &rhs_var); | |
1942 | ||
1943 | if (lhs_var == TREE_OPERAND (in, 0) | |
1944 | && rhs_var == TREE_OPERAND (in, 1)) | |
1945 | return bitsize_zero_node; | |
1946 | ||
1947 | *pvar = size_binop (TREE_CODE (in), lhs_var, rhs_var); | |
1948 | return size_binop (TREE_CODE (in), lhs_con, rhs_con); | |
1949 | } | |
1950 | else | |
1951 | return bitsize_zero_node; | |
1952 | } | |
1953 | \f | |
d47d0a8d EB |
1954 | /* Return a FUNCTION_TYPE node. RETURN_TYPE is the type returned by the |
1955 | subprogram. If it is VOID_TYPE, then we are dealing with a procedure, | |
1956 | otherwise we are dealing with a function. PARAM_DECL_LIST is a list of | |
1957 | PARM_DECL nodes that are the subprogram parameters. CICO_LIST is the | |
1958 | copy-in/copy-out list to be stored into the TYPE_CICO_LIST field. | |
1959 | RETURN_UNCONSTRAINED_P is true if the function returns an unconstrained | |
1960 | object. RETURN_BY_DIRECT_REF_P is true if the function returns by direct | |
1961 | reference. RETURN_BY_INVISI_REF_P is true if the function returns by | |
1962 | invisible reference. */ | |
a1ab4c31 AC |
1963 | |
1964 | tree | |
1965 | create_subprog_type (tree return_type, tree param_decl_list, tree cico_list, | |
d47d0a8d EB |
1966 | bool return_unconstrained_p, bool return_by_direct_ref_p, |
1967 | bool return_by_invisi_ref_p) | |
a1ab4c31 | 1968 | { |
e5b00edf NF |
1969 | /* A list of the data type nodes of the subprogram formal parameters. |
1970 | This list is generated by traversing the input list of PARM_DECL | |
1971 | nodes. */ | |
9771b263 | 1972 | vec<tree, va_gc> *param_type_list = NULL; |
d47d0a8d | 1973 | tree t, type; |
a1ab4c31 | 1974 | |
910ad8de | 1975 | for (t = param_decl_list; t; t = DECL_CHAIN (t)) |
9771b263 | 1976 | vec_safe_push (param_type_list, TREE_TYPE (t)); |
a1ab4c31 | 1977 | |
e5b00edf | 1978 | type = build_function_type_vec (return_type, param_type_list); |
a1ab4c31 | 1979 | |
d47d0a8d EB |
1980 | /* TYPE may have been shared since GCC hashes types. If it has a different |
1981 | CICO_LIST, make a copy. Likewise for the various flags. */ | |
523e82a7 EB |
1982 | if (!fntype_same_flags_p (type, cico_list, return_unconstrained_p, |
1983 | return_by_direct_ref_p, return_by_invisi_ref_p)) | |
d47d0a8d EB |
1984 | { |
1985 | type = copy_type (type); | |
1986 | TYPE_CI_CO_LIST (type) = cico_list; | |
1987 | TYPE_RETURN_UNCONSTRAINED_P (type) = return_unconstrained_p; | |
1988 | TYPE_RETURN_BY_DIRECT_REF_P (type) = return_by_direct_ref_p; | |
1989 | TREE_ADDRESSABLE (type) = return_by_invisi_ref_p; | |
1990 | } | |
a1ab4c31 | 1991 | |
a1ab4c31 AC |
1992 | return type; |
1993 | } | |
1994 | \f | |
1995 | /* Return a copy of TYPE but safe to modify in any way. */ | |
1996 | ||
1997 | tree | |
1998 | copy_type (tree type) | |
1999 | { | |
c6bd4220 | 2000 | tree new_type = copy_node (type); |
a1ab4c31 | 2001 | |
90dcfecb EB |
2002 | /* Unshare the language-specific data. */ |
2003 | if (TYPE_LANG_SPECIFIC (type)) | |
2004 | { | |
2005 | TYPE_LANG_SPECIFIC (new_type) = NULL; | |
2006 | SET_TYPE_LANG_SPECIFIC (new_type, GET_TYPE_LANG_SPECIFIC (type)); | |
2007 | } | |
2008 | ||
2009 | /* And the contents of the language-specific slot if needed. */ | |
2010 | if ((INTEGRAL_TYPE_P (type) || TREE_CODE (type) == REAL_TYPE) | |
2011 | && TYPE_RM_VALUES (type)) | |
2012 | { | |
2013 | TYPE_RM_VALUES (new_type) = NULL_TREE; | |
2014 | SET_TYPE_RM_SIZE (new_type, TYPE_RM_SIZE (type)); | |
2015 | SET_TYPE_RM_MIN_VALUE (new_type, TYPE_RM_MIN_VALUE (type)); | |
2016 | SET_TYPE_RM_MAX_VALUE (new_type, TYPE_RM_MAX_VALUE (type)); | |
2017 | } | |
2018 | ||
a1ab4c31 AC |
2019 | /* copy_node clears this field instead of copying it, because it is |
2020 | aliased with TREE_CHAIN. */ | |
c6bd4220 | 2021 | TYPE_STUB_DECL (new_type) = TYPE_STUB_DECL (type); |
a1ab4c31 | 2022 | |
c6bd4220 EB |
2023 | TYPE_POINTER_TO (new_type) = 0; |
2024 | TYPE_REFERENCE_TO (new_type) = 0; | |
2025 | TYPE_MAIN_VARIANT (new_type) = new_type; | |
2026 | TYPE_NEXT_VARIANT (new_type) = 0; | |
a1ab4c31 | 2027 | |
c6bd4220 | 2028 | return new_type; |
a1ab4c31 AC |
2029 | } |
2030 | \f | |
c1abd261 EB |
2031 | /* Return a subtype of sizetype with range MIN to MAX and whose |
2032 | TYPE_INDEX_TYPE is INDEX. GNAT_NODE is used for the position | |
2033 | of the associated TYPE_DECL. */ | |
a1ab4c31 AC |
2034 | |
2035 | tree | |
2036 | create_index_type (tree min, tree max, tree index, Node_Id gnat_node) | |
2037 | { | |
2038 | /* First build a type for the desired range. */ | |
523e82a7 | 2039 | tree type = build_nonshared_range_type (sizetype, min, max); |
a1ab4c31 | 2040 | |
523e82a7 | 2041 | /* Then set the index type. */ |
a1ab4c31 | 2042 | SET_TYPE_INDEX_TYPE (type, index); |
74746d49 | 2043 | create_type_decl (NULL_TREE, type, true, false, gnat_node); |
c1abd261 | 2044 | |
a1ab4c31 AC |
2045 | return type; |
2046 | } | |
84fb43a1 EB |
2047 | |
2048 | /* Return a subtype of TYPE with range MIN to MAX. If TYPE is NULL, | |
2049 | sizetype is used. */ | |
2050 | ||
2051 | tree | |
2052 | create_range_type (tree type, tree min, tree max) | |
2053 | { | |
2054 | tree range_type; | |
2055 | ||
2056 | if (type == NULL_TREE) | |
2057 | type = sizetype; | |
2058 | ||
2059 | /* First build a type with the base range. */ | |
523e82a7 EB |
2060 | range_type = build_nonshared_range_type (type, TYPE_MIN_VALUE (type), |
2061 | TYPE_MAX_VALUE (type)); | |
84fb43a1 EB |
2062 | |
2063 | /* Then set the actual range. */ | |
523e82a7 EB |
2064 | SET_TYPE_RM_MIN_VALUE (range_type, convert (type, min)); |
2065 | SET_TYPE_RM_MAX_VALUE (range_type, convert (type, max)); | |
84fb43a1 EB |
2066 | |
2067 | return range_type; | |
2068 | } | |
a1ab4c31 | 2069 | \f |
10069d53 EB |
2070 | /* Return a TYPE_DECL node suitable for the TYPE_STUB_DECL field of a type. |
2071 | TYPE_NAME gives the name of the type and TYPE is a ..._TYPE node giving | |
2072 | its data type. */ | |
2073 | ||
2074 | tree | |
2075 | create_type_stub_decl (tree type_name, tree type) | |
2076 | { | |
2077 | /* Using a named TYPE_DECL ensures that a type name marker is emitted in | |
2078 | STABS while setting DECL_ARTIFICIAL ensures that no DW_TAG_typedef is | |
2079 | emitted in DWARF. */ | |
c172df28 AH |
2080 | tree type_decl = build_decl (input_location, |
2081 | TYPE_DECL, type_name, type); | |
10069d53 | 2082 | DECL_ARTIFICIAL (type_decl) = 1; |
bc712852 | 2083 | TYPE_ARTIFICIAL (type) = 1; |
10069d53 EB |
2084 | return type_decl; |
2085 | } | |
2086 | ||
2087 | /* Return a TYPE_DECL node. TYPE_NAME gives the name of the type and TYPE | |
2088 | is a ..._TYPE node giving its data type. ARTIFICIAL_P is true if this | |
2089 | is a declaration that was generated by the compiler. DEBUG_INFO_P is | |
2090 | true if we need to write debug information about this type. GNAT_NODE | |
2091 | is used for the position of the decl. */ | |
a1ab4c31 AC |
2092 | |
2093 | tree | |
74746d49 EB |
2094 | create_type_decl (tree type_name, tree type, bool artificial_p, |
2095 | bool debug_info_p, Node_Id gnat_node) | |
a1ab4c31 | 2096 | { |
a1ab4c31 | 2097 | enum tree_code code = TREE_CODE (type); |
10069d53 EB |
2098 | bool named = TYPE_NAME (type) && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL; |
2099 | tree type_decl; | |
a1ab4c31 | 2100 | |
10069d53 EB |
2101 | /* Only the builtin TYPE_STUB_DECL should be used for dummy types. */ |
2102 | gcc_assert (!TYPE_IS_DUMMY_P (type)); | |
a1ab4c31 | 2103 | |
10069d53 EB |
2104 | /* If the type hasn't been named yet, we're naming it; preserve an existing |
2105 | TYPE_STUB_DECL that has been attached to it for some purpose. */ | |
2106 | if (!named && TYPE_STUB_DECL (type)) | |
2107 | { | |
2108 | type_decl = TYPE_STUB_DECL (type); | |
2109 | DECL_NAME (type_decl) = type_name; | |
2110 | } | |
2111 | else | |
74746d49 | 2112 | type_decl = build_decl (input_location, TYPE_DECL, type_name, type); |
a1ab4c31 | 2113 | |
10069d53 | 2114 | DECL_ARTIFICIAL (type_decl) = artificial_p; |
bc712852 | 2115 | TYPE_ARTIFICIAL (type) = artificial_p; |
58c8f770 EB |
2116 | |
2117 | /* Add this decl to the current binding level. */ | |
10069d53 | 2118 | gnat_pushdecl (type_decl, gnat_node); |
58c8f770 | 2119 | |
10069d53 EB |
2120 | /* If we're naming the type, equate the TYPE_STUB_DECL to the name. |
2121 | This causes the name to be also viewed as a "tag" by the debug | |
2122 | back-end, with the advantage that no DW_TAG_typedef is emitted | |
2123 | for artificial "tagged" types in DWARF. */ | |
2124 | if (!named) | |
2125 | TYPE_STUB_DECL (type) = type_decl; | |
2126 | ||
50741117 EB |
2127 | /* Do not generate debug info for UNCONSTRAINED_ARRAY_TYPE that the |
2128 | back-end doesn't support, and for others if we don't need to. */ | |
a1ab4c31 AC |
2129 | if (code == UNCONSTRAINED_ARRAY_TYPE || !debug_info_p) |
2130 | DECL_IGNORED_P (type_decl) = 1; | |
a1ab4c31 AC |
2131 | |
2132 | return type_decl; | |
2133 | } | |
10069d53 | 2134 | \f |
a1ab4c31 AC |
2135 | /* Return a VAR_DECL or CONST_DECL node. |
2136 | ||
2137 | VAR_NAME gives the name of the variable. ASM_NAME is its assembler name | |
2138 | (if provided). TYPE is its data type (a GCC ..._TYPE node). VAR_INIT is | |
2139 | the GCC tree for an optional initial expression; NULL_TREE if none. | |
2140 | ||
2141 | CONST_FLAG is true if this variable is constant, in which case we might | |
2142 | return a CONST_DECL node unless CONST_DECL_ALLOWED_P is false. | |
2143 | ||
2144 | PUBLIC_FLAG is true if this is for a reference to a public entity or for a | |
2145 | definition to be made visible outside of the current compilation unit, for | |
2146 | instance variable definitions in a package specification. | |
2147 | ||
1e17ef87 | 2148 | EXTERN_FLAG is true when processing an external variable declaration (as |
a1ab4c31 AC |
2149 | opposed to a definition: no storage is to be allocated for the variable). |
2150 | ||
2151 | STATIC_FLAG is only relevant when not at top level. In that case | |
2152 | it indicates whether to always allocate storage to the variable. | |
2153 | ||
2154 | GNAT_NODE is used for the position of the decl. */ | |
2155 | ||
2156 | tree | |
2157 | create_var_decl_1 (tree var_name, tree asm_name, tree type, tree var_init, | |
2158 | bool const_flag, bool public_flag, bool extern_flag, | |
2159 | bool static_flag, bool const_decl_allowed_p, | |
2160 | struct attrib *attr_list, Node_Id gnat_node) | |
2161 | { | |
50179d58 EB |
2162 | /* Whether the initializer is a constant initializer. At the global level |
2163 | or for an external object or an object to be allocated in static memory, | |
2164 | we check that it is a valid constant expression for use in initializing | |
2165 | a static variable; otherwise, we only check that it is constant. */ | |
a1ab4c31 AC |
2166 | bool init_const |
2167 | = (var_init != 0 | |
2168 | && gnat_types_compatible_p (type, TREE_TYPE (var_init)) | |
50179d58 | 2169 | && (global_bindings_p () || extern_flag || static_flag |
a1ab4c31 AC |
2170 | ? initializer_constant_valid_p (var_init, TREE_TYPE (var_init)) != 0 |
2171 | : TREE_CONSTANT (var_init))); | |
2172 | ||
2173 | /* Whether we will make TREE_CONSTANT the DECL we produce here, in which | |
2174 | case the initializer may be used in-lieu of the DECL node (as done in | |
2175 | Identifier_to_gnu). This is useful to prevent the need of elaboration | |
2176 | code when an identifier for which such a decl is made is in turn used as | |
2177 | an initializer. We used to rely on CONST vs VAR_DECL for this purpose, | |
2178 | but extra constraints apply to this choice (see below) and are not | |
2179 | relevant to the distinction we wish to make. */ | |
2180 | bool constant_p = const_flag && init_const; | |
2181 | ||
2182 | /* The actual DECL node. CONST_DECL was initially intended for enumerals | |
2183 | and may be used for scalars in general but not for aggregates. */ | |
2184 | tree var_decl | |
c172df28 AH |
2185 | = build_decl (input_location, |
2186 | (constant_p && const_decl_allowed_p | |
a1ab4c31 AC |
2187 | && !AGGREGATE_TYPE_P (type)) ? CONST_DECL : VAR_DECL, |
2188 | var_name, type); | |
2189 | ||
2190 | /* If this is external, throw away any initializations (they will be done | |
2191 | elsewhere) unless this is a constant for which we would like to remain | |
2192 | able to get the initializer. If we are defining a global here, leave a | |
2193 | constant initialization and save any variable elaborations for the | |
2194 | elaboration routine. If we are just annotating types, throw away the | |
2195 | initialization if it isn't a constant. */ | |
2196 | if ((extern_flag && !constant_p) | |
2197 | || (type_annotate_only && var_init && !TREE_CONSTANT (var_init))) | |
2198 | var_init = NULL_TREE; | |
2199 | ||
2200 | /* At the global level, an initializer requiring code to be generated | |
2201 | produces elaboration statements. Check that such statements are allowed, | |
2202 | that is, not violating a No_Elaboration_Code restriction. */ | |
3b9e8343 | 2203 | if (global_bindings_p () && var_init != 0 && !init_const) |
a1ab4c31 | 2204 | Check_Elaboration_Code_Allowed (gnat_node); |
3b9e8343 | 2205 | |
8b7b0c36 JH |
2206 | DECL_INITIAL (var_decl) = var_init; |
2207 | TREE_READONLY (var_decl) = const_flag; | |
2208 | DECL_EXTERNAL (var_decl) = extern_flag; | |
2209 | TREE_PUBLIC (var_decl) = public_flag || extern_flag; | |
2210 | TREE_CONSTANT (var_decl) = constant_p; | |
2211 | TREE_THIS_VOLATILE (var_decl) = TREE_SIDE_EFFECTS (var_decl) | |
2212 | = TYPE_VOLATILE (type); | |
a1ab4c31 AC |
2213 | |
2214 | /* Ada doesn't feature Fortran-like COMMON variables so we shouldn't | |
2215 | try to fiddle with DECL_COMMON. However, on platforms that don't | |
2216 | support global BSS sections, uninitialized global variables would | |
2217 | go in DATA instead, thus increasing the size of the executable. */ | |
2218 | if (!flag_no_common | |
2219 | && TREE_CODE (var_decl) == VAR_DECL | |
3b9e8343 | 2220 | && TREE_PUBLIC (var_decl) |
a1ab4c31 AC |
2221 | && !have_global_bss_p ()) |
2222 | DECL_COMMON (var_decl) = 1; | |
a1ab4c31 | 2223 | |
2231f17f EB |
2224 | /* At the global binding level, we need to allocate static storage for the |
2225 | variable if it isn't external. Otherwise, we allocate automatic storage | |
2226 | unless requested not to. */ | |
a1ab4c31 | 2227 | TREE_STATIC (var_decl) |
2231f17f | 2228 | = !extern_flag && (static_flag || global_bindings_p ()); |
a1ab4c31 | 2229 | |
5225a138 EB |
2230 | /* For an external constant whose initializer is not absolute, do not emit |
2231 | debug info. In DWARF this would mean a global relocation in a read-only | |
c01fe451 | 2232 | section which runs afoul of the PE-COFF run-time relocation mechanism. */ |
5225a138 EB |
2233 | if (extern_flag |
2234 | && constant_p | |
50179d58 | 2235 | && var_init |
5225a138 EB |
2236 | && initializer_constant_valid_p (var_init, TREE_TYPE (var_init)) |
2237 | != null_pointer_node) | |
2238 | DECL_IGNORED_P (var_decl) = 1; | |
2239 | ||
a1ab4c31 AC |
2240 | if (TREE_SIDE_EFFECTS (var_decl)) |
2241 | TREE_ADDRESSABLE (var_decl) = 1; | |
2242 | ||
74746d49 EB |
2243 | /* ??? Some attributes cannot be applied to CONST_DECLs. */ |
2244 | if (TREE_CODE (var_decl) == VAR_DECL) | |
2245 | process_attributes (&var_decl, &attr_list, true, gnat_node); | |
2246 | ||
2247 | /* Add this decl to the current binding level. */ | |
2248 | gnat_pushdecl (var_decl, gnat_node); | |
2249 | ||
58c8f770 | 2250 | if (TREE_CODE (var_decl) == VAR_DECL) |
a1ab4c31 | 2251 | { |
58c8f770 EB |
2252 | if (asm_name) |
2253 | SET_DECL_ASSEMBLER_NAME (var_decl, asm_name); | |
74746d49 | 2254 | |
a1ab4c31 AC |
2255 | if (global_bindings_p ()) |
2256 | rest_of_decl_compilation (var_decl, true, 0); | |
2257 | } | |
a1ab4c31 AC |
2258 | |
2259 | return var_decl; | |
2260 | } | |
2261 | \f | |
2262 | /* Return true if TYPE, an aggregate type, contains (or is) an array. */ | |
2263 | ||
2264 | static bool | |
2265 | aggregate_type_contains_array_p (tree type) | |
2266 | { | |
2267 | switch (TREE_CODE (type)) | |
2268 | { | |
2269 | case RECORD_TYPE: | |
2270 | case UNION_TYPE: | |
2271 | case QUAL_UNION_TYPE: | |
2272 | { | |
2273 | tree field; | |
910ad8de | 2274 | for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
2275 | if (AGGREGATE_TYPE_P (TREE_TYPE (field)) |
2276 | && aggregate_type_contains_array_p (TREE_TYPE (field))) | |
2277 | return true; | |
2278 | return false; | |
2279 | } | |
2280 | ||
2281 | case ARRAY_TYPE: | |
2282 | return true; | |
2283 | ||
2284 | default: | |
2285 | gcc_unreachable (); | |
2286 | } | |
2287 | } | |
2288 | ||
62f9f3ce | 2289 | /* Return a FIELD_DECL node. FIELD_NAME is the field's name, FIELD_TYPE is |
da01bfee EB |
2290 | its type and RECORD_TYPE is the type of the enclosing record. If SIZE is |
2291 | nonzero, it is the specified size of the field. If POS is nonzero, it is | |
2292 | the bit position. PACKED is 1 if the enclosing record is packed, -1 if it | |
2293 | has Component_Alignment of Storage_Unit. If ADDRESSABLE is nonzero, it | |
62f9f3ce EB |
2294 | means we are allowed to take the address of the field; if it is negative, |
2295 | we should not make a bitfield, which is used by make_aligning_type. */ | |
a1ab4c31 AC |
2296 | |
2297 | tree | |
2298 | create_field_decl (tree field_name, tree field_type, tree record_type, | |
da01bfee | 2299 | tree size, tree pos, int packed, int addressable) |
a1ab4c31 | 2300 | { |
c172df28 AH |
2301 | tree field_decl = build_decl (input_location, |
2302 | FIELD_DECL, field_name, field_type); | |
a1ab4c31 AC |
2303 | |
2304 | DECL_CONTEXT (field_decl) = record_type; | |
2305 | TREE_READONLY (field_decl) = TYPE_READONLY (field_type); | |
2306 | ||
2307 | /* If FIELD_TYPE is BLKmode, we must ensure this is aligned to at least a | |
2308 | byte boundary since GCC cannot handle less-aligned BLKmode bitfields. | |
2309 | Likewise for an aggregate without specified position that contains an | |
2310 | array, because in this case slices of variable length of this array | |
2311 | must be handled by GCC and variable-sized objects need to be aligned | |
2312 | to at least a byte boundary. */ | |
2313 | if (packed && (TYPE_MODE (field_type) == BLKmode | |
2314 | || (!pos | |
2315 | && AGGREGATE_TYPE_P (field_type) | |
2316 | && aggregate_type_contains_array_p (field_type)))) | |
2317 | DECL_ALIGN (field_decl) = BITS_PER_UNIT; | |
2318 | ||
2319 | /* If a size is specified, use it. Otherwise, if the record type is packed | |
2320 | compute a size to use, which may differ from the object's natural size. | |
2321 | We always set a size in this case to trigger the checks for bitfield | |
2322 | creation below, which is typically required when no position has been | |
2323 | specified. */ | |
2324 | if (size) | |
2325 | size = convert (bitsizetype, size); | |
2326 | else if (packed == 1) | |
2327 | { | |
2328 | size = rm_size (field_type); | |
62f9f3ce EB |
2329 | if (TYPE_MODE (field_type) == BLKmode) |
2330 | size = round_up (size, BITS_PER_UNIT); | |
a1ab4c31 AC |
2331 | } |
2332 | ||
2333 | /* If we may, according to ADDRESSABLE, make a bitfield if a size is | |
2334 | specified for two reasons: first if the size differs from the natural | |
2335 | size. Second, if the alignment is insufficient. There are a number of | |
2336 | ways the latter can be true. | |
2337 | ||
2338 | We never make a bitfield if the type of the field has a nonconstant size, | |
2339 | because no such entity requiring bitfield operations should reach here. | |
2340 | ||
2341 | We do *preventively* make a bitfield when there might be the need for it | |
2342 | but we don't have all the necessary information to decide, as is the case | |
2343 | of a field with no specified position in a packed record. | |
2344 | ||
2345 | We also don't look at STRICT_ALIGNMENT here, and rely on later processing | |
2346 | in layout_decl or finish_record_type to clear the bit_field indication if | |
2347 | it is in fact not needed. */ | |
2348 | if (addressable >= 0 | |
2349 | && size | |
2350 | && TREE_CODE (size) == INTEGER_CST | |
2351 | && TREE_CODE (TYPE_SIZE (field_type)) == INTEGER_CST | |
2352 | && (!tree_int_cst_equal (size, TYPE_SIZE (field_type)) | |
2353 | || (pos && !value_factor_p (pos, TYPE_ALIGN (field_type))) | |
2354 | || packed | |
2355 | || (TYPE_ALIGN (record_type) != 0 | |
2356 | && TYPE_ALIGN (record_type) < TYPE_ALIGN (field_type)))) | |
2357 | { | |
2358 | DECL_BIT_FIELD (field_decl) = 1; | |
2359 | DECL_SIZE (field_decl) = size; | |
2360 | if (!packed && !pos) | |
feec4372 EB |
2361 | { |
2362 | if (TYPE_ALIGN (record_type) != 0 | |
2363 | && TYPE_ALIGN (record_type) < TYPE_ALIGN (field_type)) | |
2364 | DECL_ALIGN (field_decl) = TYPE_ALIGN (record_type); | |
2365 | else | |
2366 | DECL_ALIGN (field_decl) = TYPE_ALIGN (field_type); | |
2367 | } | |
a1ab4c31 AC |
2368 | } |
2369 | ||
2370 | DECL_PACKED (field_decl) = pos ? DECL_BIT_FIELD (field_decl) : packed; | |
2371 | ||
2372 | /* Bump the alignment if need be, either for bitfield/packing purposes or | |
2373 | to satisfy the type requirements if no such consideration applies. When | |
2374 | we get the alignment from the type, indicate if this is from an explicit | |
2375 | user request, which prevents stor-layout from lowering it later on. */ | |
2376 | { | |
d9223014 | 2377 | unsigned int bit_align |
a1ab4c31 AC |
2378 | = (DECL_BIT_FIELD (field_decl) ? 1 |
2379 | : packed && TYPE_MODE (field_type) != BLKmode ? BITS_PER_UNIT : 0); | |
2380 | ||
2381 | if (bit_align > DECL_ALIGN (field_decl)) | |
2382 | DECL_ALIGN (field_decl) = bit_align; | |
2383 | else if (!bit_align && TYPE_ALIGN (field_type) > DECL_ALIGN (field_decl)) | |
2384 | { | |
2385 | DECL_ALIGN (field_decl) = TYPE_ALIGN (field_type); | |
2386 | DECL_USER_ALIGN (field_decl) = TYPE_USER_ALIGN (field_type); | |
2387 | } | |
2388 | } | |
2389 | ||
2390 | if (pos) | |
2391 | { | |
2392 | /* We need to pass in the alignment the DECL is known to have. | |
2393 | This is the lowest-order bit set in POS, but no more than | |
2394 | the alignment of the record, if one is specified. Note | |
2395 | that an alignment of 0 is taken as infinite. */ | |
2396 | unsigned int known_align; | |
2397 | ||
2398 | if (host_integerp (pos, 1)) | |
2399 | known_align = tree_low_cst (pos, 1) & - tree_low_cst (pos, 1); | |
2400 | else | |
2401 | known_align = BITS_PER_UNIT; | |
2402 | ||
2403 | if (TYPE_ALIGN (record_type) | |
2404 | && (known_align == 0 || known_align > TYPE_ALIGN (record_type))) | |
2405 | known_align = TYPE_ALIGN (record_type); | |
2406 | ||
2407 | layout_decl (field_decl, known_align); | |
2408 | SET_DECL_OFFSET_ALIGN (field_decl, | |
2409 | host_integerp (pos, 1) ? BIGGEST_ALIGNMENT | |
2410 | : BITS_PER_UNIT); | |
2411 | pos_from_bit (&DECL_FIELD_OFFSET (field_decl), | |
2412 | &DECL_FIELD_BIT_OFFSET (field_decl), | |
2413 | DECL_OFFSET_ALIGN (field_decl), pos); | |
a1ab4c31 AC |
2414 | } |
2415 | ||
2416 | /* In addition to what our caller says, claim the field is addressable if we | |
2417 | know that its type is not suitable. | |
2418 | ||
2419 | The field may also be "technically" nonaddressable, meaning that even if | |
2420 | we attempt to take the field's address we will actually get the address | |
2421 | of a copy. This is the case for true bitfields, but the DECL_BIT_FIELD | |
2422 | value we have at this point is not accurate enough, so we don't account | |
2423 | for this here and let finish_record_type decide. */ | |
4c5a0615 | 2424 | if (!addressable && !type_for_nonaliased_component_p (field_type)) |
a1ab4c31 AC |
2425 | addressable = 1; |
2426 | ||
2427 | DECL_NONADDRESSABLE_P (field_decl) = !addressable; | |
2428 | ||
2429 | return field_decl; | |
2430 | } | |
2431 | \f | |
a8e05f92 EB |
2432 | /* Return a PARM_DECL node. PARAM_NAME is the name of the parameter and |
2433 | PARAM_TYPE is its type. READONLY is true if the parameter is readonly | |
2434 | (either an In parameter or an address of a pass-by-ref parameter). */ | |
a1ab4c31 AC |
2435 | |
2436 | tree | |
2437 | create_param_decl (tree param_name, tree param_type, bool readonly) | |
2438 | { | |
c172df28 AH |
2439 | tree param_decl = build_decl (input_location, |
2440 | PARM_DECL, param_name, param_type); | |
a1ab4c31 | 2441 | |
a8e05f92 EB |
2442 | /* Honor TARGET_PROMOTE_PROTOTYPES like the C compiler, as not doing so |
2443 | can lead to various ABI violations. */ | |
2444 | if (targetm.calls.promote_prototypes (NULL_TREE) | |
2445 | && INTEGRAL_TYPE_P (param_type) | |
a1ab4c31 AC |
2446 | && TYPE_PRECISION (param_type) < TYPE_PRECISION (integer_type_node)) |
2447 | { | |
2448 | /* We have to be careful about biased types here. Make a subtype | |
2449 | of integer_type_node with the proper biasing. */ | |
2450 | if (TREE_CODE (param_type) == INTEGER_TYPE | |
2451 | && TYPE_BIASED_REPRESENTATION_P (param_type)) | |
2452 | { | |
84fb43a1 EB |
2453 | tree subtype |
2454 | = make_unsigned_type (TYPE_PRECISION (integer_type_node)); | |
c1abd261 EB |
2455 | TREE_TYPE (subtype) = integer_type_node; |
2456 | TYPE_BIASED_REPRESENTATION_P (subtype) = 1; | |
84fb43a1 EB |
2457 | SET_TYPE_RM_MIN_VALUE (subtype, TYPE_MIN_VALUE (param_type)); |
2458 | SET_TYPE_RM_MAX_VALUE (subtype, TYPE_MAX_VALUE (param_type)); | |
c1abd261 | 2459 | param_type = subtype; |
a1ab4c31 AC |
2460 | } |
2461 | else | |
2462 | param_type = integer_type_node; | |
2463 | } | |
2464 | ||
2465 | DECL_ARG_TYPE (param_decl) = param_type; | |
2466 | TREE_READONLY (param_decl) = readonly; | |
2467 | return param_decl; | |
2468 | } | |
2469 | \f | |
74746d49 EB |
2470 | /* Process the attributes in ATTR_LIST for NODE, which is either a DECL or |
2471 | a TYPE. If IN_PLACE is true, the tree pointed to by NODE should not be | |
2472 | changed. GNAT_NODE is used for the position of error messages. */ | |
a1ab4c31 | 2473 | |
74746d49 EB |
2474 | void |
2475 | process_attributes (tree *node, struct attrib **attr_list, bool in_place, | |
2476 | Node_Id gnat_node) | |
a1ab4c31 | 2477 | { |
74746d49 EB |
2478 | struct attrib *attr; |
2479 | ||
2480 | for (attr = *attr_list; attr; attr = attr->next) | |
2481 | switch (attr->type) | |
a1ab4c31 AC |
2482 | { |
2483 | case ATTR_MACHINE_ATTRIBUTE: | |
74746d49 EB |
2484 | Sloc_to_locus (Sloc (gnat_node), &input_location); |
2485 | decl_attributes (node, tree_cons (attr->name, attr->args, NULL_TREE), | |
2486 | in_place ? ATTR_FLAG_TYPE_IN_PLACE : 0); | |
a1ab4c31 AC |
2487 | break; |
2488 | ||
2489 | case ATTR_LINK_ALIAS: | |
74746d49 | 2490 | if (!DECL_EXTERNAL (*node)) |
a1ab4c31 | 2491 | { |
74746d49 EB |
2492 | TREE_STATIC (*node) = 1; |
2493 | assemble_alias (*node, attr->name); | |
a1ab4c31 AC |
2494 | } |
2495 | break; | |
2496 | ||
2497 | case ATTR_WEAK_EXTERNAL: | |
2498 | if (SUPPORTS_WEAK) | |
74746d49 | 2499 | declare_weak (*node); |
a1ab4c31 AC |
2500 | else |
2501 | post_error ("?weak declarations not supported on this target", | |
74746d49 | 2502 | attr->error_point); |
a1ab4c31 AC |
2503 | break; |
2504 | ||
2505 | case ATTR_LINK_SECTION: | |
677f3fa8 | 2506 | if (targetm_common.have_named_sections) |
a1ab4c31 | 2507 | { |
74746d49 EB |
2508 | DECL_SECTION_NAME (*node) |
2509 | = build_string (IDENTIFIER_LENGTH (attr->name), | |
2510 | IDENTIFIER_POINTER (attr->name)); | |
2511 | DECL_COMMON (*node) = 0; | |
a1ab4c31 AC |
2512 | } |
2513 | else | |
2514 | post_error ("?section attributes are not supported for this target", | |
74746d49 | 2515 | attr->error_point); |
a1ab4c31 AC |
2516 | break; |
2517 | ||
2518 | case ATTR_LINK_CONSTRUCTOR: | |
74746d49 EB |
2519 | DECL_STATIC_CONSTRUCTOR (*node) = 1; |
2520 | TREE_USED (*node) = 1; | |
a1ab4c31 AC |
2521 | break; |
2522 | ||
2523 | case ATTR_LINK_DESTRUCTOR: | |
74746d49 EB |
2524 | DECL_STATIC_DESTRUCTOR (*node) = 1; |
2525 | TREE_USED (*node) = 1; | |
a1ab4c31 | 2526 | break; |
40a14772 TG |
2527 | |
2528 | case ATTR_THREAD_LOCAL_STORAGE: | |
74746d49 EB |
2529 | DECL_TLS_MODEL (*node) = decl_default_tls_model (*node); |
2530 | DECL_COMMON (*node) = 0; | |
40a14772 | 2531 | break; |
a1ab4c31 | 2532 | } |
74746d49 EB |
2533 | |
2534 | *attr_list = NULL; | |
a1ab4c31 AC |
2535 | } |
2536 | \f | |
feec4372 | 2537 | /* Record DECL as a global renaming pointer. */ |
a1ab4c31 AC |
2538 | |
2539 | void | |
2540 | record_global_renaming_pointer (tree decl) | |
2541 | { | |
15bf7d19 | 2542 | gcc_assert (!DECL_LOOP_PARM_P (decl) && DECL_RENAMED_OBJECT (decl)); |
9771b263 | 2543 | vec_safe_push (global_renaming_pointers, decl); |
a1ab4c31 AC |
2544 | } |
2545 | ||
2546 | /* Invalidate the global renaming pointers. */ | |
2547 | ||
2548 | void | |
2549 | invalidate_global_renaming_pointers (void) | |
2550 | { | |
2551 | unsigned int i; | |
2552 | tree iter; | |
2553 | ||
9771b263 DN |
2554 | if (global_renaming_pointers == NULL) |
2555 | return; | |
2556 | ||
2557 | FOR_EACH_VEC_ELT (*global_renaming_pointers, i, iter) | |
a1ab4c31 AC |
2558 | SET_DECL_RENAMED_OBJECT (iter, NULL_TREE); |
2559 | ||
9771b263 | 2560 | vec_free (global_renaming_pointers); |
a1ab4c31 AC |
2561 | } |
2562 | ||
2563 | /* Return true if VALUE is a known to be a multiple of FACTOR, which must be | |
2564 | a power of 2. */ | |
2565 | ||
2566 | bool | |
2567 | value_factor_p (tree value, HOST_WIDE_INT factor) | |
2568 | { | |
2569 | if (host_integerp (value, 1)) | |
2570 | return tree_low_cst (value, 1) % factor == 0; | |
2571 | ||
2572 | if (TREE_CODE (value) == MULT_EXPR) | |
2573 | return (value_factor_p (TREE_OPERAND (value, 0), factor) | |
2574 | || value_factor_p (TREE_OPERAND (value, 1), factor)); | |
2575 | ||
2576 | return false; | |
2577 | } | |
2578 | ||
7d7fcb08 | 2579 | /* Given two consecutive field decls PREV_FIELD and CURR_FIELD, return true |
a1ab4c31 AC |
2580 | unless we can prove these 2 fields are laid out in such a way that no gap |
2581 | exist between the end of PREV_FIELD and the beginning of CURR_FIELD. OFFSET | |
2582 | is the distance in bits between the end of PREV_FIELD and the starting | |
2583 | position of CURR_FIELD. It is ignored if null. */ | |
2584 | ||
2585 | static bool | |
2586 | potential_alignment_gap (tree prev_field, tree curr_field, tree offset) | |
2587 | { | |
2588 | /* If this is the first field of the record, there cannot be any gap */ | |
2589 | if (!prev_field) | |
2590 | return false; | |
2591 | ||
78df6221 | 2592 | /* If the previous field is a union type, then return false: The only |
a1ab4c31 AC |
2593 | time when such a field is not the last field of the record is when |
2594 | there are other components at fixed positions after it (meaning there | |
2595 | was a rep clause for every field), in which case we don't want the | |
2596 | alignment constraint to override them. */ | |
2597 | if (TREE_CODE (TREE_TYPE (prev_field)) == QUAL_UNION_TYPE) | |
2598 | return false; | |
2599 | ||
2600 | /* If the distance between the end of prev_field and the beginning of | |
2601 | curr_field is constant, then there is a gap if the value of this | |
2602 | constant is not null. */ | |
2603 | if (offset && host_integerp (offset, 1)) | |
2604 | return !integer_zerop (offset); | |
2605 | ||
2606 | /* If the size and position of the previous field are constant, | |
2607 | then check the sum of this size and position. There will be a gap | |
2608 | iff it is not multiple of the current field alignment. */ | |
2609 | if (host_integerp (DECL_SIZE (prev_field), 1) | |
2610 | && host_integerp (bit_position (prev_field), 1)) | |
2611 | return ((tree_low_cst (bit_position (prev_field), 1) | |
2612 | + tree_low_cst (DECL_SIZE (prev_field), 1)) | |
2613 | % DECL_ALIGN (curr_field) != 0); | |
2614 | ||
2615 | /* If both the position and size of the previous field are multiples | |
2616 | of the current field alignment, there cannot be any gap. */ | |
2617 | if (value_factor_p (bit_position (prev_field), DECL_ALIGN (curr_field)) | |
2618 | && value_factor_p (DECL_SIZE (prev_field), DECL_ALIGN (curr_field))) | |
2619 | return false; | |
2620 | ||
2621 | /* Fallback, return that there may be a potential gap */ | |
2622 | return true; | |
2623 | } | |
2624 | ||
88a94e2b EB |
2625 | /* Return a LABEL_DECL with LABEL_NAME. GNAT_NODE is used for the position |
2626 | of the decl. */ | |
a1ab4c31 AC |
2627 | |
2628 | tree | |
88a94e2b | 2629 | create_label_decl (tree label_name, Node_Id gnat_node) |
a1ab4c31 | 2630 | { |
88a94e2b EB |
2631 | tree label_decl |
2632 | = build_decl (input_location, LABEL_DECL, label_name, void_type_node); | |
a1ab4c31 | 2633 | |
88a94e2b EB |
2634 | DECL_MODE (label_decl) = VOIDmode; |
2635 | ||
2636 | /* Add this decl to the current binding level. */ | |
2637 | gnat_pushdecl (label_decl, gnat_node); | |
a1ab4c31 AC |
2638 | |
2639 | return label_decl; | |
2640 | } | |
2641 | \f | |
7d7fcb08 | 2642 | /* Return a FUNCTION_DECL node. SUBPROG_NAME is the name of the subprogram, |
a1ab4c31 AC |
2643 | ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE |
2644 | node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of | |
7d76717d | 2645 | PARM_DECL nodes chained through the DECL_CHAIN field). |
a1ab4c31 | 2646 | |
0e24192c | 2647 | INLINE_STATUS, PUBLIC_FLAG, EXTERN_FLAG, ARTIFICIAL_FLAG and ATTR_LIST are |
7d7fcb08 EB |
2648 | used to set the appropriate fields in the FUNCTION_DECL. GNAT_NODE is |
2649 | used for the position of the decl. */ | |
a1ab4c31 AC |
2650 | |
2651 | tree | |
7d7fcb08 | 2652 | create_subprog_decl (tree subprog_name, tree asm_name, tree subprog_type, |
0e24192c EB |
2653 | tree param_decl_list, enum inline_status_t inline_status, |
2654 | bool public_flag, bool extern_flag, bool artificial_flag, | |
7d7fcb08 | 2655 | struct attrib *attr_list, Node_Id gnat_node) |
a1ab4c31 | 2656 | { |
d47d0a8d EB |
2657 | tree subprog_decl = build_decl (input_location, FUNCTION_DECL, subprog_name, |
2658 | subprog_type); | |
2659 | tree result_decl = build_decl (input_location, RESULT_DECL, NULL_TREE, | |
2660 | TREE_TYPE (subprog_type)); | |
7d7fcb08 | 2661 | DECL_ARGUMENTS (subprog_decl) = param_decl_list; |
a1ab4c31 | 2662 | |
d84b344a EB |
2663 | /* If this is a non-inline function nested inside an inlined external |
2664 | function, we cannot honor both requests without cloning the nested | |
2665 | function in the current unit since it is private to the other unit. | |
2666 | We could inline the nested function as well but it's probably better | |
2667 | to err on the side of too little inlining. */ | |
0e24192c | 2668 | if (inline_status != is_enabled |
5daed84a | 2669 | && !public_flag |
d84b344a EB |
2670 | && current_function_decl |
2671 | && DECL_DECLARED_INLINE_P (current_function_decl) | |
a1ab4c31 | 2672 | && DECL_EXTERNAL (current_function_decl)) |
d84b344a | 2673 | DECL_DECLARED_INLINE_P (current_function_decl) = 0; |
a1ab4c31 | 2674 | |
7d7fcb08 EB |
2675 | DECL_ARTIFICIAL (subprog_decl) = artificial_flag; |
2676 | DECL_EXTERNAL (subprog_decl) = extern_flag; | |
0e24192c EB |
2677 | |
2678 | switch (inline_status) | |
2679 | { | |
2680 | case is_suppressed: | |
2681 | DECL_UNINLINABLE (subprog_decl) = 1; | |
2682 | break; | |
2683 | ||
2684 | case is_disabled: | |
2685 | break; | |
2686 | ||
2687 | case is_enabled: | |
2688 | DECL_DECLARED_INLINE_P (subprog_decl) = 1; | |
2689 | DECL_NO_INLINE_WARNING_P (subprog_decl) = artificial_flag; | |
2690 | break; | |
2691 | ||
2692 | default: | |
2693 | gcc_unreachable (); | |
2694 | } | |
7d7fcb08 EB |
2695 | |
2696 | TREE_PUBLIC (subprog_decl) = public_flag; | |
2697 | TREE_READONLY (subprog_decl) = TYPE_READONLY (subprog_type); | |
a1ab4c31 AC |
2698 | TREE_THIS_VOLATILE (subprog_decl) = TYPE_VOLATILE (subprog_type); |
2699 | TREE_SIDE_EFFECTS (subprog_decl) = TYPE_VOLATILE (subprog_type); | |
a1ab4c31 | 2700 | |
d47d0a8d EB |
2701 | DECL_ARTIFICIAL (result_decl) = 1; |
2702 | DECL_IGNORED_P (result_decl) = 1; | |
2703 | DECL_BY_REFERENCE (result_decl) = TREE_ADDRESSABLE (subprog_type); | |
2704 | DECL_RESULT (subprog_decl) = result_decl; | |
a1ab4c31 | 2705 | |
a1ab4c31 AC |
2706 | if (asm_name) |
2707 | { | |
2708 | SET_DECL_ASSEMBLER_NAME (subprog_decl, asm_name); | |
2709 | ||
2710 | /* The expand_main_function circuitry expects "main_identifier_node" to | |
2711 | designate the DECL_NAME of the 'main' entry point, in turn expected | |
2712 | to be declared as the "main" function literally by default. Ada | |
2713 | program entry points are typically declared with a different name | |
2714 | within the binder generated file, exported as 'main' to satisfy the | |
cfbb663c | 2715 | system expectations. Force main_identifier_node in this case. */ |
a1ab4c31 | 2716 | if (asm_name == main_identifier_node) |
cfbb663c | 2717 | DECL_NAME (subprog_decl) = main_identifier_node; |
a1ab4c31 AC |
2718 | } |
2719 | ||
74746d49 EB |
2720 | process_attributes (&subprog_decl, &attr_list, true, gnat_node); |
2721 | ||
a1ab4c31 AC |
2722 | /* Add this decl to the current binding level. */ |
2723 | gnat_pushdecl (subprog_decl, gnat_node); | |
2724 | ||
2725 | /* Output the assembler code and/or RTL for the declaration. */ | |
2726 | rest_of_decl_compilation (subprog_decl, global_bindings_p (), 0); | |
2727 | ||
2728 | return subprog_decl; | |
2729 | } | |
2730 | \f | |
2731 | /* Set up the framework for generating code for SUBPROG_DECL, a subprogram | |
2732 | body. This routine needs to be invoked before processing the declarations | |
2733 | appearing in the subprogram. */ | |
2734 | ||
2735 | void | |
2736 | begin_subprog_body (tree subprog_decl) | |
2737 | { | |
2738 | tree param_decl; | |
2739 | ||
a1ab4c31 AC |
2740 | announce_function (subprog_decl); |
2741 | ||
0ae44446 JR |
2742 | /* This function is being defined. */ |
2743 | TREE_STATIC (subprog_decl) = 1; | |
2744 | ||
58c8f770 EB |
2745 | current_function_decl = subprog_decl; |
2746 | ||
a1ab4c31 AC |
2747 | /* Enter a new binding level and show that all the parameters belong to |
2748 | this function. */ | |
2749 | gnat_pushlevel (); | |
a09d56d8 | 2750 | |
a1ab4c31 | 2751 | for (param_decl = DECL_ARGUMENTS (subprog_decl); param_decl; |
910ad8de | 2752 | param_decl = DECL_CHAIN (param_decl)) |
a1ab4c31 AC |
2753 | DECL_CONTEXT (param_decl) = subprog_decl; |
2754 | ||
2755 | make_decl_rtl (subprog_decl); | |
a1ab4c31 AC |
2756 | } |
2757 | ||
71196d4e | 2758 | /* Finish translating the current subprogram and set its BODY. */ |
a1ab4c31 AC |
2759 | |
2760 | void | |
a406865a | 2761 | end_subprog_body (tree body) |
a1ab4c31 AC |
2762 | { |
2763 | tree fndecl = current_function_decl; | |
2764 | ||
bd9c7fb9 | 2765 | /* Attach the BLOCK for this level to the function and pop the level. */ |
a1ab4c31 AC |
2766 | BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl; |
2767 | DECL_INITIAL (fndecl) = current_binding_level->block; | |
2768 | gnat_poplevel (); | |
2769 | ||
a1ab4c31 AC |
2770 | /* Mark the RESULT_DECL as being in this subprogram. */ |
2771 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; | |
2772 | ||
a963da4d EB |
2773 | /* The body should be a BIND_EXPR whose BLOCK is the top-level one. */ |
2774 | if (TREE_CODE (body) == BIND_EXPR) | |
2775 | { | |
2776 | BLOCK_SUPERCONTEXT (BIND_EXPR_BLOCK (body)) = fndecl; | |
2777 | DECL_INITIAL (fndecl) = BIND_EXPR_BLOCK (body); | |
2778 | } | |
2779 | ||
a1ab4c31 AC |
2780 | DECL_SAVED_TREE (fndecl) = body; |
2781 | ||
228ee426 | 2782 | current_function_decl = decl_function_context (fndecl); |
71196d4e EB |
2783 | } |
2784 | ||
2785 | /* Wrap up compilation of SUBPROG_DECL, a subprogram body. */ | |
a1ab4c31 | 2786 | |
71196d4e EB |
2787 | void |
2788 | rest_of_subprog_body_compilation (tree subprog_decl) | |
2789 | { | |
a1ab4c31 AC |
2790 | /* We cannot track the location of errors past this point. */ |
2791 | error_gnat_node = Empty; | |
2792 | ||
2793 | /* If we're only annotating types, don't actually compile this function. */ | |
2794 | if (type_annotate_only) | |
2795 | return; | |
2796 | ||
a406865a | 2797 | /* Dump functions before gimplification. */ |
71196d4e | 2798 | dump_function (TDI_original, subprog_decl); |
a406865a | 2799 | |
228ee426 | 2800 | if (!decl_function_context (subprog_decl)) |
71196d4e | 2801 | cgraph_finalize_function (subprog_decl, false); |
a1ab4c31 AC |
2802 | else |
2803 | /* Register this function with cgraph just far enough to get it | |
2804 | added to our parent's nested function list. */ | |
71196d4e | 2805 | (void) cgraph_get_create_node (subprog_decl); |
a1ab4c31 AC |
2806 | } |
2807 | ||
a1ab4c31 AC |
2808 | tree |
2809 | gnat_builtin_function (tree decl) | |
2810 | { | |
2811 | gnat_pushdecl (decl, Empty); | |
2812 | return decl; | |
2813 | } | |
2814 | ||
2815 | /* Return an integer type with the number of bits of precision given by | |
2816 | PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise | |
2817 | it is a signed type. */ | |
2818 | ||
2819 | tree | |
2820 | gnat_type_for_size (unsigned precision, int unsignedp) | |
2821 | { | |
2822 | tree t; | |
2823 | char type_name[20]; | |
2824 | ||
2825 | if (precision <= 2 * MAX_BITS_PER_WORD | |
2826 | && signed_and_unsigned_types[precision][unsignedp]) | |
2827 | return signed_and_unsigned_types[precision][unsignedp]; | |
2828 | ||
2829 | if (unsignedp) | |
2830 | t = make_unsigned_type (precision); | |
2831 | else | |
2832 | t = make_signed_type (precision); | |
2833 | ||
2834 | if (precision <= 2 * MAX_BITS_PER_WORD) | |
2835 | signed_and_unsigned_types[precision][unsignedp] = t; | |
2836 | ||
2837 | if (!TYPE_NAME (t)) | |
2838 | { | |
c3d79c60 | 2839 | sprintf (type_name, "%sSIGNED_%u", unsignedp ? "UN" : "", precision); |
a1ab4c31 AC |
2840 | TYPE_NAME (t) = get_identifier (type_name); |
2841 | } | |
2842 | ||
2843 | return t; | |
2844 | } | |
2845 | ||
2846 | /* Likewise for floating-point types. */ | |
2847 | ||
2848 | static tree | |
2849 | float_type_for_precision (int precision, enum machine_mode mode) | |
2850 | { | |
2851 | tree t; | |
2852 | char type_name[20]; | |
2853 | ||
2854 | if (float_types[(int) mode]) | |
2855 | return float_types[(int) mode]; | |
2856 | ||
2857 | float_types[(int) mode] = t = make_node (REAL_TYPE); | |
2858 | TYPE_PRECISION (t) = precision; | |
2859 | layout_type (t); | |
2860 | ||
2861 | gcc_assert (TYPE_MODE (t) == mode); | |
2862 | if (!TYPE_NAME (t)) | |
2863 | { | |
2864 | sprintf (type_name, "FLOAT_%d", precision); | |
2865 | TYPE_NAME (t) = get_identifier (type_name); | |
2866 | } | |
2867 | ||
2868 | return t; | |
2869 | } | |
2870 | ||
2871 | /* Return a data type that has machine mode MODE. UNSIGNEDP selects | |
2872 | an unsigned type; otherwise a signed type is returned. */ | |
2873 | ||
2874 | tree | |
2875 | gnat_type_for_mode (enum machine_mode mode, int unsignedp) | |
2876 | { | |
2877 | if (mode == BLKmode) | |
2878 | return NULL_TREE; | |
2799d18c EB |
2879 | |
2880 | if (mode == VOIDmode) | |
a1ab4c31 | 2881 | return void_type_node; |
2799d18c EB |
2882 | |
2883 | if (COMPLEX_MODE_P (mode)) | |
a1ab4c31 | 2884 | return NULL_TREE; |
2799d18c EB |
2885 | |
2886 | if (SCALAR_FLOAT_MODE_P (mode)) | |
a1ab4c31 | 2887 | return float_type_for_precision (GET_MODE_PRECISION (mode), mode); |
2799d18c EB |
2888 | |
2889 | if (SCALAR_INT_MODE_P (mode)) | |
a1ab4c31 | 2890 | return gnat_type_for_size (GET_MODE_BITSIZE (mode), unsignedp); |
2799d18c EB |
2891 | |
2892 | if (VECTOR_MODE_P (mode)) | |
2893 | { | |
2894 | enum machine_mode inner_mode = GET_MODE_INNER (mode); | |
2895 | tree inner_type = gnat_type_for_mode (inner_mode, unsignedp); | |
2896 | if (inner_type) | |
2897 | return build_vector_type_for_mode (inner_type, mode); | |
2898 | } | |
2899 | ||
2900 | return NULL_TREE; | |
a1ab4c31 AC |
2901 | } |
2902 | ||
2903 | /* Return the unsigned version of a TYPE_NODE, a scalar type. */ | |
2904 | ||
2905 | tree | |
2906 | gnat_unsigned_type (tree type_node) | |
2907 | { | |
2908 | tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 1); | |
2909 | ||
2910 | if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node)) | |
2911 | { | |
2912 | type = copy_node (type); | |
2913 | TREE_TYPE (type) = type_node; | |
2914 | } | |
2915 | else if (TREE_TYPE (type_node) | |
2916 | && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE | |
2917 | && TYPE_MODULAR_P (TREE_TYPE (type_node))) | |
2918 | { | |
2919 | type = copy_node (type); | |
2920 | TREE_TYPE (type) = TREE_TYPE (type_node); | |
2921 | } | |
2922 | ||
2923 | return type; | |
2924 | } | |
2925 | ||
2926 | /* Return the signed version of a TYPE_NODE, a scalar type. */ | |
2927 | ||
2928 | tree | |
2929 | gnat_signed_type (tree type_node) | |
2930 | { | |
2931 | tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 0); | |
2932 | ||
2933 | if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node)) | |
2934 | { | |
2935 | type = copy_node (type); | |
2936 | TREE_TYPE (type) = type_node; | |
2937 | } | |
2938 | else if (TREE_TYPE (type_node) | |
2939 | && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE | |
2940 | && TYPE_MODULAR_P (TREE_TYPE (type_node))) | |
2941 | { | |
2942 | type = copy_node (type); | |
2943 | TREE_TYPE (type) = TREE_TYPE (type_node); | |
2944 | } | |
2945 | ||
2946 | return type; | |
2947 | } | |
2948 | ||
2949 | /* Return 1 if the types T1 and T2 are compatible, i.e. if they can be | |
2950 | transparently converted to each other. */ | |
2951 | ||
2952 | int | |
2953 | gnat_types_compatible_p (tree t1, tree t2) | |
2954 | { | |
2955 | enum tree_code code; | |
2956 | ||
2957 | /* This is the default criterion. */ | |
2958 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
2959 | return 1; | |
2960 | ||
2961 | /* We only check structural equivalence here. */ | |
2962 | if ((code = TREE_CODE (t1)) != TREE_CODE (t2)) | |
2963 | return 0; | |
2964 | ||
7948ae37 OH |
2965 | /* Vector types are also compatible if they have the same number of subparts |
2966 | and the same form of (scalar) element type. */ | |
2967 | if (code == VECTOR_TYPE | |
2968 | && TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2) | |
2969 | && TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2)) | |
2970 | && TYPE_PRECISION (TREE_TYPE (t1)) == TYPE_PRECISION (TREE_TYPE (t2))) | |
2971 | return 1; | |
2972 | ||
cfa0bd19 | 2973 | /* Array types are also compatible if they are constrained and have the same |
96bba5e6 | 2974 | domain(s) and the same component type. */ |
a1ab4c31 | 2975 | if (code == ARRAY_TYPE |
0adef32b JJ |
2976 | && (TYPE_DOMAIN (t1) == TYPE_DOMAIN (t2) |
2977 | || (TYPE_DOMAIN (t1) | |
b4680ca1 | 2978 | && TYPE_DOMAIN (t2) |
0adef32b JJ |
2979 | && tree_int_cst_equal (TYPE_MIN_VALUE (TYPE_DOMAIN (t1)), |
2980 | TYPE_MIN_VALUE (TYPE_DOMAIN (t2))) | |
2981 | && tree_int_cst_equal (TYPE_MAX_VALUE (TYPE_DOMAIN (t1)), | |
cfa0bd19 | 2982 | TYPE_MAX_VALUE (TYPE_DOMAIN (t2))))) |
96bba5e6 EB |
2983 | && (TREE_TYPE (t1) == TREE_TYPE (t2) |
2984 | || (TREE_CODE (TREE_TYPE (t1)) == ARRAY_TYPE | |
2985 | && gnat_types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2))))) | |
a1ab4c31 AC |
2986 | return 1; |
2987 | ||
a1ab4c31 AC |
2988 | return 0; |
2989 | } | |
523e82a7 | 2990 | |
71196d4e EB |
2991 | /* Return true if EXPR is a useless type conversion. */ |
2992 | ||
2993 | bool | |
2994 | gnat_useless_type_conversion (tree expr) | |
2995 | { | |
2996 | if (CONVERT_EXPR_P (expr) | |
2997 | || TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
2998 | || TREE_CODE (expr) == NON_LVALUE_EXPR) | |
2999 | return gnat_types_compatible_p (TREE_TYPE (expr), | |
3000 | TREE_TYPE (TREE_OPERAND (expr, 0))); | |
3001 | ||
3002 | return false; | |
3003 | } | |
3004 | ||
523e82a7 EB |
3005 | /* Return true if T, a FUNCTION_TYPE, has the specified list of flags. */ |
3006 | ||
3007 | bool | |
3008 | fntype_same_flags_p (const_tree t, tree cico_list, bool return_unconstrained_p, | |
3009 | bool return_by_direct_ref_p, bool return_by_invisi_ref_p) | |
3010 | { | |
3011 | return TYPE_CI_CO_LIST (t) == cico_list | |
3012 | && TYPE_RETURN_UNCONSTRAINED_P (t) == return_unconstrained_p | |
3013 | && TYPE_RETURN_BY_DIRECT_REF_P (t) == return_by_direct_ref_p | |
3014 | && TREE_ADDRESSABLE (t) == return_by_invisi_ref_p; | |
3015 | } | |
a1ab4c31 AC |
3016 | \f |
3017 | /* EXP is an expression for the size of an object. If this size contains | |
3018 | discriminant references, replace them with the maximum (if MAX_P) or | |
3019 | minimum (if !MAX_P) possible value of the discriminant. */ | |
3020 | ||
3021 | tree | |
3022 | max_size (tree exp, bool max_p) | |
3023 | { | |
3024 | enum tree_code code = TREE_CODE (exp); | |
3025 | tree type = TREE_TYPE (exp); | |
3026 | ||
3027 | switch (TREE_CODE_CLASS (code)) | |
3028 | { | |
3029 | case tcc_declaration: | |
3030 | case tcc_constant: | |
3031 | return exp; | |
3032 | ||
3033 | case tcc_vl_exp: | |
3034 | if (code == CALL_EXPR) | |
3035 | { | |
f82a627c EB |
3036 | tree t, *argarray; |
3037 | int n, i; | |
3038 | ||
3039 | t = maybe_inline_call_in_expr (exp); | |
3040 | if (t) | |
3041 | return max_size (t, max_p); | |
a1ab4c31 | 3042 | |
f82a627c EB |
3043 | n = call_expr_nargs (exp); |
3044 | gcc_assert (n > 0); | |
2bb1fc26 | 3045 | argarray = XALLOCAVEC (tree, n); |
a1ab4c31 AC |
3046 | for (i = 0; i < n; i++) |
3047 | argarray[i] = max_size (CALL_EXPR_ARG (exp, i), max_p); | |
3048 | return build_call_array (type, CALL_EXPR_FN (exp), n, argarray); | |
3049 | } | |
3050 | break; | |
3051 | ||
3052 | case tcc_reference: | |
3053 | /* If this contains a PLACEHOLDER_EXPR, it is the thing we want to | |
3054 | modify. Otherwise, we treat it like a variable. */ | |
3055 | if (!CONTAINS_PLACEHOLDER_P (exp)) | |
3056 | return exp; | |
3057 | ||
3058 | type = TREE_TYPE (TREE_OPERAND (exp, 1)); | |
3059 | return | |
3060 | max_size (max_p ? TYPE_MAX_VALUE (type) : TYPE_MIN_VALUE (type), true); | |
3061 | ||
3062 | case tcc_comparison: | |
3063 | return max_p ? size_one_node : size_zero_node; | |
3064 | ||
3065 | case tcc_unary: | |
ce3da0d0 EB |
3066 | if (code == NON_LVALUE_EXPR) |
3067 | return max_size (TREE_OPERAND (exp, 0), max_p); | |
6625d7bc | 3068 | |
ce3da0d0 EB |
3069 | return fold_build1 (code, type, |
3070 | max_size (TREE_OPERAND (exp, 0), | |
3071 | code == NEGATE_EXPR ? !max_p : max_p)); | |
3072 | ||
a1ab4c31 | 3073 | case tcc_binary: |
ce3da0d0 EB |
3074 | { |
3075 | tree lhs = max_size (TREE_OPERAND (exp, 0), max_p); | |
3076 | tree rhs = max_size (TREE_OPERAND (exp, 1), | |
3077 | code == MINUS_EXPR ? !max_p : max_p); | |
3078 | ||
3079 | /* Special-case wanting the maximum value of a MIN_EXPR. | |
3080 | In that case, if one side overflows, return the other. */ | |
3081 | if (max_p && code == MIN_EXPR) | |
3082 | { | |
3083 | if (TREE_CODE (rhs) == INTEGER_CST && TREE_OVERFLOW (rhs)) | |
3084 | return lhs; | |
3085 | ||
3086 | if (TREE_CODE (lhs) == INTEGER_CST && TREE_OVERFLOW (lhs)) | |
3087 | return rhs; | |
3088 | } | |
3089 | ||
3090 | /* Likewise, handle a MINUS_EXPR or PLUS_EXPR with the LHS | |
3091 | overflowing and the RHS a variable. */ | |
3092 | if ((code == MINUS_EXPR || code == PLUS_EXPR) | |
3093 | && TREE_CODE (lhs) == INTEGER_CST | |
3094 | && TREE_OVERFLOW (lhs) | |
3095 | && !TREE_CONSTANT (rhs)) | |
3096 | return lhs; | |
3097 | ||
3098 | return size_binop (code, lhs, rhs); | |
3099 | } | |
3100 | ||
a1ab4c31 AC |
3101 | case tcc_expression: |
3102 | switch (TREE_CODE_LENGTH (code)) | |
3103 | { | |
3104 | case 1: | |
722356ce EB |
3105 | if (code == SAVE_EXPR) |
3106 | return exp; | |
ce3da0d0 EB |
3107 | |
3108 | return fold_build1 (code, type, | |
3109 | max_size (TREE_OPERAND (exp, 0), max_p)); | |
a1ab4c31 AC |
3110 | |
3111 | case 2: | |
3112 | if (code == COMPOUND_EXPR) | |
3113 | return max_size (TREE_OPERAND (exp, 1), max_p); | |
3114 | ||
ce3da0d0 EB |
3115 | return fold_build2 (code, type, |
3116 | max_size (TREE_OPERAND (exp, 0), max_p), | |
3117 | max_size (TREE_OPERAND (exp, 1), max_p)); | |
a1ab4c31 AC |
3118 | |
3119 | case 3: | |
722356ce | 3120 | if (code == COND_EXPR) |
a1ab4c31 AC |
3121 | return fold_build2 (max_p ? MAX_EXPR : MIN_EXPR, type, |
3122 | max_size (TREE_OPERAND (exp, 1), max_p), | |
3123 | max_size (TREE_OPERAND (exp, 2), max_p)); | |
ce3da0d0 EB |
3124 | |
3125 | default: | |
3126 | break; | |
a1ab4c31 AC |
3127 | } |
3128 | ||
3129 | /* Other tree classes cannot happen. */ | |
3130 | default: | |
3131 | break; | |
3132 | } | |
3133 | ||
3134 | gcc_unreachable (); | |
3135 | } | |
3136 | \f | |
3137 | /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE. | |
3138 | EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs. | |
3139 | Return a constructor for the template. */ | |
3140 | ||
3141 | tree | |
3142 | build_template (tree template_type, tree array_type, tree expr) | |
3143 | { | |
9771b263 | 3144 | vec<constructor_elt, va_gc> *template_elts = NULL; |
a1ab4c31 AC |
3145 | tree bound_list = NULL_TREE; |
3146 | tree field; | |
3147 | ||
3148 | while (TREE_CODE (array_type) == RECORD_TYPE | |
315cff15 | 3149 | && (TYPE_PADDING_P (array_type) |
a1ab4c31 AC |
3150 | || TYPE_JUSTIFIED_MODULAR_P (array_type))) |
3151 | array_type = TREE_TYPE (TYPE_FIELDS (array_type)); | |
3152 | ||
3153 | if (TREE_CODE (array_type) == ARRAY_TYPE | |
3154 | || (TREE_CODE (array_type) == INTEGER_TYPE | |
3155 | && TYPE_HAS_ACTUAL_BOUNDS_P (array_type))) | |
3156 | bound_list = TYPE_ACTUAL_BOUNDS (array_type); | |
3157 | ||
3158 | /* First make the list for a CONSTRUCTOR for the template. Go down the | |
3159 | field list of the template instead of the type chain because this | |
3160 | array might be an Ada array of arrays and we can't tell where the | |
3161 | nested arrays stop being the underlying object. */ | |
3162 | ||
3163 | for (field = TYPE_FIELDS (template_type); field; | |
3164 | (bound_list | |
3165 | ? (bound_list = TREE_CHAIN (bound_list)) | |
3166 | : (array_type = TREE_TYPE (array_type))), | |
910ad8de | 3167 | field = DECL_CHAIN (DECL_CHAIN (field))) |
a1ab4c31 AC |
3168 | { |
3169 | tree bounds, min, max; | |
3170 | ||
3171 | /* If we have a bound list, get the bounds from there. Likewise | |
3172 | for an ARRAY_TYPE. Otherwise, if expr is a PARM_DECL with | |
3173 | DECL_BY_COMPONENT_PTR_P, use the bounds of the field in the template. | |
3174 | This will give us a maximum range. */ | |
3175 | if (bound_list) | |
3176 | bounds = TREE_VALUE (bound_list); | |
3177 | else if (TREE_CODE (array_type) == ARRAY_TYPE) | |
3178 | bounds = TYPE_INDEX_TYPE (TYPE_DOMAIN (array_type)); | |
3179 | else if (expr && TREE_CODE (expr) == PARM_DECL | |
3180 | && DECL_BY_COMPONENT_PTR_P (expr)) | |
3181 | bounds = TREE_TYPE (field); | |
3182 | else | |
3183 | gcc_unreachable (); | |
3184 | ||
3185 | min = convert (TREE_TYPE (field), TYPE_MIN_VALUE (bounds)); | |
910ad8de | 3186 | max = convert (TREE_TYPE (DECL_CHAIN (field)), TYPE_MAX_VALUE (bounds)); |
a1ab4c31 AC |
3187 | |
3188 | /* If either MIN or MAX involve a PLACEHOLDER_EXPR, we must | |
3189 | substitute it from OBJECT. */ | |
3190 | min = SUBSTITUTE_PLACEHOLDER_IN_EXPR (min, expr); | |
3191 | max = SUBSTITUTE_PLACEHOLDER_IN_EXPR (max, expr); | |
3192 | ||
0e228dd9 | 3193 | CONSTRUCTOR_APPEND_ELT (template_elts, field, min); |
910ad8de | 3194 | CONSTRUCTOR_APPEND_ELT (template_elts, DECL_CHAIN (field), max); |
a1ab4c31 AC |
3195 | } |
3196 | ||
0e228dd9 | 3197 | return gnat_build_constructor (template_type, template_elts); |
a1ab4c31 AC |
3198 | } |
3199 | \f | |
31a5a547 EB |
3200 | /* Helper routine to make a descriptor field. FIELD_LIST is the list of decls |
3201 | being built; the new decl is chained on to the front of the list. */ | |
3202 | ||
3203 | static tree | |
3204 | make_descriptor_field (const char *name, tree type, tree rec_type, | |
3205 | tree initial, tree field_list) | |
3206 | { | |
3207 | tree field | |
3208 | = create_field_decl (get_identifier (name), type, rec_type, NULL_TREE, | |
3209 | NULL_TREE, 0, 0); | |
3210 | ||
3211 | DECL_INITIAL (field) = initial; | |
3212 | DECL_CHAIN (field) = field_list; | |
3213 | return field; | |
3214 | } | |
3215 | ||
58c8f770 EB |
3216 | /* Build a 32-bit VMS descriptor from a Mechanism_Type, which must specify a |
3217 | descriptor type, and the GCC type of an object. Each FIELD_DECL in the | |
3218 | type contains in its DECL_INITIAL the expression to use when a constructor | |
3219 | is made for the type. GNAT_ENTITY is an entity used to print out an error | |
3220 | message if the mechanism cannot be applied to an object of that type and | |
3221 | also for the name. */ | |
a1ab4c31 AC |
3222 | |
3223 | tree | |
d628c015 | 3224 | build_vms_descriptor32 (tree type, Mechanism_Type mech, Entity_Id gnat_entity) |
a1ab4c31 AC |
3225 | { |
3226 | tree record_type = make_node (RECORD_TYPE); | |
31a5a547 | 3227 | tree pointer32_type, pointer64_type; |
788e5046 | 3228 | tree field_list = NULL_TREE; |
31a5a547 EB |
3229 | int klass, ndim, i, dtype = 0; |
3230 | tree inner_type, tem; | |
a1ab4c31 | 3231 | tree *idx_arr; |
a1ab4c31 AC |
3232 | |
3233 | /* If TYPE is an unconstrained array, use the underlying array type. */ | |
3234 | if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) | |
3235 | type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))); | |
3236 | ||
3237 | /* If this is an array, compute the number of dimensions in the array, | |
3238 | get the index types, and point to the inner type. */ | |
3239 | if (TREE_CODE (type) != ARRAY_TYPE) | |
3240 | ndim = 0; | |
3241 | else | |
3242 | for (ndim = 1, inner_type = type; | |
3243 | TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE | |
3244 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type)); | |
3245 | ndim++, inner_type = TREE_TYPE (inner_type)) | |
3246 | ; | |
3247 | ||
2bb1fc26 | 3248 | idx_arr = XALLOCAVEC (tree, ndim); |
a1ab4c31 | 3249 | |
d628c015 | 3250 | if (mech != By_Descriptor_NCA && mech != By_Short_Descriptor_NCA |
a1ab4c31 AC |
3251 | && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type)) |
3252 | for (i = ndim - 1, inner_type = type; | |
3253 | i >= 0; | |
3254 | i--, inner_type = TREE_TYPE (inner_type)) | |
3255 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
3256 | else | |
3257 | for (i = 0, inner_type = type; | |
3258 | i < ndim; | |
3259 | i++, inner_type = TREE_TYPE (inner_type)) | |
3260 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
3261 | ||
3262 | /* Now get the DTYPE value. */ | |
3263 | switch (TREE_CODE (type)) | |
3264 | { | |
3265 | case INTEGER_TYPE: | |
3266 | case ENUMERAL_TYPE: | |
01ddebf2 | 3267 | case BOOLEAN_TYPE: |
a1ab4c31 AC |
3268 | if (TYPE_VAX_FLOATING_POINT_P (type)) |
3269 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
3270 | { | |
3271 | case 6: | |
3272 | dtype = 10; | |
3273 | break; | |
3274 | case 9: | |
3275 | dtype = 11; | |
3276 | break; | |
3277 | case 15: | |
3278 | dtype = 27; | |
3279 | break; | |
3280 | } | |
3281 | else | |
3282 | switch (GET_MODE_BITSIZE (TYPE_MODE (type))) | |
3283 | { | |
3284 | case 8: | |
3285 | dtype = TYPE_UNSIGNED (type) ? 2 : 6; | |
3286 | break; | |
3287 | case 16: | |
3288 | dtype = TYPE_UNSIGNED (type) ? 3 : 7; | |
3289 | break; | |
3290 | case 32: | |
3291 | dtype = TYPE_UNSIGNED (type) ? 4 : 8; | |
3292 | break; | |
3293 | case 64: | |
3294 | dtype = TYPE_UNSIGNED (type) ? 5 : 9; | |
3295 | break; | |
3296 | case 128: | |
3297 | dtype = TYPE_UNSIGNED (type) ? 25 : 26; | |
3298 | break; | |
3299 | } | |
3300 | break; | |
3301 | ||
3302 | case REAL_TYPE: | |
3303 | dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53; | |
3304 | break; | |
3305 | ||
3306 | case COMPLEX_TYPE: | |
3307 | if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE | |
3308 | && TYPE_VAX_FLOATING_POINT_P (type)) | |
3309 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
3310 | { | |
3311 | case 6: | |
3312 | dtype = 12; | |
3313 | break; | |
3314 | case 9: | |
3315 | dtype = 13; | |
3316 | break; | |
3317 | case 15: | |
3318 | dtype = 29; | |
3319 | } | |
3320 | else | |
3321 | dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55; | |
3322 | break; | |
3323 | ||
3324 | case ARRAY_TYPE: | |
3325 | dtype = 14; | |
3326 | break; | |
3327 | ||
3328 | default: | |
3329 | break; | |
3330 | } | |
3331 | ||
3332 | /* Get the CLASS value. */ | |
3333 | switch (mech) | |
3334 | { | |
3335 | case By_Descriptor_A: | |
d628c015 | 3336 | case By_Short_Descriptor_A: |
c6bd4220 | 3337 | klass = 4; |
a1ab4c31 AC |
3338 | break; |
3339 | case By_Descriptor_NCA: | |
d628c015 | 3340 | case By_Short_Descriptor_NCA: |
c6bd4220 | 3341 | klass = 10; |
a1ab4c31 AC |
3342 | break; |
3343 | case By_Descriptor_SB: | |
d628c015 | 3344 | case By_Short_Descriptor_SB: |
c6bd4220 | 3345 | klass = 15; |
a1ab4c31 AC |
3346 | break; |
3347 | case By_Descriptor: | |
d628c015 | 3348 | case By_Short_Descriptor: |
a1ab4c31 | 3349 | case By_Descriptor_S: |
d628c015 | 3350 | case By_Short_Descriptor_S: |
a1ab4c31 | 3351 | default: |
c6bd4220 | 3352 | klass = 1; |
a1ab4c31 AC |
3353 | break; |
3354 | } | |
3355 | ||
58c8f770 EB |
3356 | /* Make the type for a descriptor for VMS. The first four fields are the |
3357 | same for all types. */ | |
82b481ed EB |
3358 | field_list |
3359 | = make_descriptor_field ("LENGTH", gnat_type_for_size (16, 1), record_type, | |
3360 | size_in_bytes ((mech == By_Descriptor_A | |
3361 | || mech == By_Short_Descriptor_A) | |
3362 | ? inner_type : type), | |
3363 | field_list); | |
3364 | field_list | |
3365 | = make_descriptor_field ("DTYPE", gnat_type_for_size (8, 1), record_type, | |
3366 | size_int (dtype), field_list); | |
3367 | field_list | |
3368 | = make_descriptor_field ("CLASS", gnat_type_for_size (8, 1), record_type, | |
3369 | size_int (klass), field_list); | |
a1ab4c31 | 3370 | |
a1ab4c31 | 3371 | pointer32_type = build_pointer_type_for_mode (type, SImode, false); |
31a5a547 EB |
3372 | pointer64_type = build_pointer_type_for_mode (type, DImode, false); |
3373 | ||
3374 | /* Ensure that only 32-bit pointers are passed in 32-bit descriptors. Note | |
3375 | that we cannot build a template call to the CE routine as it would get a | |
3376 | wrong source location; instead we use a second placeholder for it. */ | |
3377 | tem = build_unary_op (ADDR_EXPR, pointer64_type, | |
3378 | build0 (PLACEHOLDER_EXPR, type)); | |
3379 | tem = build3 (COND_EXPR, pointer32_type, | |
f542c405 EB |
3380 | Pmode != SImode |
3381 | ? build_binary_op (GE_EXPR, boolean_type_node, tem, | |
3382 | build_int_cstu (pointer64_type, 0x80000000)) | |
3383 | : boolean_false_node, | |
31a5a547 EB |
3384 | build0 (PLACEHOLDER_EXPR, void_type_node), |
3385 | convert (pointer32_type, tem)); | |
a1ab4c31 | 3386 | |
82b481ed | 3387 | field_list |
31a5a547 | 3388 | = make_descriptor_field ("POINTER", pointer32_type, record_type, tem, |
82b481ed | 3389 | field_list); |
a1ab4c31 AC |
3390 | |
3391 | switch (mech) | |
3392 | { | |
3393 | case By_Descriptor: | |
d628c015 | 3394 | case By_Short_Descriptor: |
a1ab4c31 | 3395 | case By_Descriptor_S: |
d628c015 | 3396 | case By_Short_Descriptor_S: |
a1ab4c31 AC |
3397 | break; |
3398 | ||
3399 | case By_Descriptor_SB: | |
d628c015 | 3400 | case By_Short_Descriptor_SB: |
82b481ed EB |
3401 | field_list |
3402 | = make_descriptor_field ("SB_L1", gnat_type_for_size (32, 1), | |
3403 | record_type, | |
3404 | (TREE_CODE (type) == ARRAY_TYPE | |
3405 | ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) | |
3406 | : size_zero_node), | |
3407 | field_list); | |
3408 | field_list | |
3409 | = make_descriptor_field ("SB_U1", gnat_type_for_size (32, 1), | |
3410 | record_type, | |
3411 | (TREE_CODE (type) == ARRAY_TYPE | |
3412 | ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
3413 | : size_zero_node), | |
3414 | field_list); | |
a1ab4c31 AC |
3415 | break; |
3416 | ||
3417 | case By_Descriptor_A: | |
d628c015 | 3418 | case By_Short_Descriptor_A: |
a1ab4c31 | 3419 | case By_Descriptor_NCA: |
d628c015 | 3420 | case By_Short_Descriptor_NCA: |
82b481ed EB |
3421 | field_list |
3422 | = make_descriptor_field ("SCALE", gnat_type_for_size (8, 1), | |
3423 | record_type, size_zero_node, field_list); | |
3424 | ||
3425 | field_list | |
3426 | = make_descriptor_field ("DIGITS", gnat_type_for_size (8, 1), | |
3427 | record_type, size_zero_node, field_list); | |
3428 | ||
82b481ed EB |
3429 | field_list |
3430 | = make_descriptor_field ("AFLAGS", gnat_type_for_size (8, 1), | |
3431 | record_type, | |
3432 | size_int ((mech == By_Descriptor_NCA | |
3433 | || mech == By_Short_Descriptor_NCA) | |
3434 | ? 0 | |
3435 | /* Set FL_COLUMN, FL_COEFF, and | |
3436 | FL_BOUNDS. */ | |
3437 | : (TREE_CODE (type) == ARRAY_TYPE | |
3438 | && TYPE_CONVENTION_FORTRAN_P | |
3439 | (type) | |
3440 | ? 224 : 192)), | |
3441 | field_list); | |
3442 | ||
3443 | field_list | |
3444 | = make_descriptor_field ("DIMCT", gnat_type_for_size (8, 1), | |
3445 | record_type, size_int (ndim), field_list); | |
3446 | ||
3447 | field_list | |
3448 | = make_descriptor_field ("ARSIZE", gnat_type_for_size (32, 1), | |
3449 | record_type, size_in_bytes (type), | |
3450 | field_list); | |
a1ab4c31 AC |
3451 | |
3452 | /* Now build a pointer to the 0,0,0... element. */ | |
3453 | tem = build0 (PLACEHOLDER_EXPR, type); | |
3454 | for (i = 0, inner_type = type; i < ndim; | |
3455 | i++, inner_type = TREE_TYPE (inner_type)) | |
3456 | tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem, | |
3457 | convert (TYPE_DOMAIN (inner_type), size_zero_node), | |
3458 | NULL_TREE, NULL_TREE); | |
3459 | ||
82b481ed EB |
3460 | field_list |
3461 | = make_descriptor_field ("A0", pointer32_type, record_type, | |
3462 | build1 (ADDR_EXPR, pointer32_type, tem), | |
3463 | field_list); | |
a1ab4c31 AC |
3464 | |
3465 | /* Next come the addressing coefficients. */ | |
3466 | tem = size_one_node; | |
3467 | for (i = 0; i < ndim; i++) | |
3468 | { | |
3469 | char fname[3]; | |
3470 | tree idx_length | |
3471 | = size_binop (MULT_EXPR, tem, | |
3472 | size_binop (PLUS_EXPR, | |
3473 | size_binop (MINUS_EXPR, | |
3474 | TYPE_MAX_VALUE (idx_arr[i]), | |
3475 | TYPE_MIN_VALUE (idx_arr[i])), | |
3476 | size_int (1))); | |
3477 | ||
d628c015 DR |
3478 | fname[0] = ((mech == By_Descriptor_NCA || |
3479 | mech == By_Short_Descriptor_NCA) ? 'S' : 'M'); | |
a1ab4c31 | 3480 | fname[1] = '0' + i, fname[2] = 0; |
82b481ed EB |
3481 | field_list |
3482 | = make_descriptor_field (fname, gnat_type_for_size (32, 1), | |
3483 | record_type, idx_length, field_list); | |
a1ab4c31 | 3484 | |
d628c015 | 3485 | if (mech == By_Descriptor_NCA || mech == By_Short_Descriptor_NCA) |
a1ab4c31 AC |
3486 | tem = idx_length; |
3487 | } | |
3488 | ||
3489 | /* Finally here are the bounds. */ | |
3490 | for (i = 0; i < ndim; i++) | |
3491 | { | |
3492 | char fname[3]; | |
3493 | ||
3494 | fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0; | |
82b481ed EB |
3495 | field_list |
3496 | = make_descriptor_field (fname, gnat_type_for_size (32, 1), | |
3497 | record_type, TYPE_MIN_VALUE (idx_arr[i]), | |
3498 | field_list); | |
a1ab4c31 AC |
3499 | |
3500 | fname[0] = 'U'; | |
82b481ed EB |
3501 | field_list |
3502 | = make_descriptor_field (fname, gnat_type_for_size (32, 1), | |
3503 | record_type, TYPE_MAX_VALUE (idx_arr[i]), | |
3504 | field_list); | |
a1ab4c31 AC |
3505 | } |
3506 | break; | |
3507 | ||
3508 | default: | |
3509 | post_error ("unsupported descriptor type for &", gnat_entity); | |
3510 | } | |
3511 | ||
10069d53 | 3512 | TYPE_NAME (record_type) = create_concat_name (gnat_entity, "DESC"); |
788e5046 | 3513 | finish_record_type (record_type, nreverse (field_list), 0, false); |
a1ab4c31 AC |
3514 | return record_type; |
3515 | } | |
3516 | ||
58c8f770 EB |
3517 | /* Build a 64-bit VMS descriptor from a Mechanism_Type, which must specify a |
3518 | descriptor type, and the GCC type of an object. Each FIELD_DECL in the | |
3519 | type contains in its DECL_INITIAL the expression to use when a constructor | |
3520 | is made for the type. GNAT_ENTITY is an entity used to print out an error | |
3521 | message if the mechanism cannot be applied to an object of that type and | |
3522 | also for the name. */ | |
6ca2b0a0 DR |
3523 | |
3524 | tree | |
d628c015 | 3525 | build_vms_descriptor (tree type, Mechanism_Type mech, Entity_Id gnat_entity) |
6ca2b0a0 | 3526 | { |
31a5a547 | 3527 | tree record_type = make_node (RECORD_TYPE); |
6ca2b0a0 | 3528 | tree pointer64_type; |
31a5a547 EB |
3529 | tree field_list = NULL_TREE; |
3530 | int klass, ndim, i, dtype = 0; | |
3531 | tree inner_type, tem; | |
6ca2b0a0 | 3532 | tree *idx_arr; |
6ca2b0a0 DR |
3533 | |
3534 | /* If TYPE is an unconstrained array, use the underlying array type. */ | |
3535 | if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) | |
3536 | type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))); | |
3537 | ||
3538 | /* If this is an array, compute the number of dimensions in the array, | |
3539 | get the index types, and point to the inner type. */ | |
3540 | if (TREE_CODE (type) != ARRAY_TYPE) | |
3541 | ndim = 0; | |
3542 | else | |
3543 | for (ndim = 1, inner_type = type; | |
3544 | TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE | |
3545 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type)); | |
3546 | ndim++, inner_type = TREE_TYPE (inner_type)) | |
3547 | ; | |
3548 | ||
2bb1fc26 | 3549 | idx_arr = XALLOCAVEC (tree, ndim); |
6ca2b0a0 DR |
3550 | |
3551 | if (mech != By_Descriptor_NCA | |
3552 | && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type)) | |
3553 | for (i = ndim - 1, inner_type = type; | |
3554 | i >= 0; | |
3555 | i--, inner_type = TREE_TYPE (inner_type)) | |
3556 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
3557 | else | |
3558 | for (i = 0, inner_type = type; | |
3559 | i < ndim; | |
3560 | i++, inner_type = TREE_TYPE (inner_type)) | |
3561 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
3562 | ||
3563 | /* Now get the DTYPE value. */ | |
3564 | switch (TREE_CODE (type)) | |
3565 | { | |
3566 | case INTEGER_TYPE: | |
3567 | case ENUMERAL_TYPE: | |
01ddebf2 | 3568 | case BOOLEAN_TYPE: |
6ca2b0a0 DR |
3569 | if (TYPE_VAX_FLOATING_POINT_P (type)) |
3570 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
3571 | { | |
3572 | case 6: | |
3573 | dtype = 10; | |
3574 | break; | |
3575 | case 9: | |
3576 | dtype = 11; | |
3577 | break; | |
3578 | case 15: | |
3579 | dtype = 27; | |
3580 | break; | |
3581 | } | |
3582 | else | |
3583 | switch (GET_MODE_BITSIZE (TYPE_MODE (type))) | |
3584 | { | |
3585 | case 8: | |
3586 | dtype = TYPE_UNSIGNED (type) ? 2 : 6; | |
3587 | break; | |
3588 | case 16: | |
3589 | dtype = TYPE_UNSIGNED (type) ? 3 : 7; | |
3590 | break; | |
3591 | case 32: | |
3592 | dtype = TYPE_UNSIGNED (type) ? 4 : 8; | |
3593 | break; | |
3594 | case 64: | |
3595 | dtype = TYPE_UNSIGNED (type) ? 5 : 9; | |
3596 | break; | |
3597 | case 128: | |
3598 | dtype = TYPE_UNSIGNED (type) ? 25 : 26; | |
3599 | break; | |
3600 | } | |
3601 | break; | |
3602 | ||
3603 | case REAL_TYPE: | |
3604 | dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53; | |
3605 | break; | |
3606 | ||
3607 | case COMPLEX_TYPE: | |
3608 | if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE | |
3609 | && TYPE_VAX_FLOATING_POINT_P (type)) | |
3610 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
3611 | { | |
3612 | case 6: | |
3613 | dtype = 12; | |
3614 | break; | |
3615 | case 9: | |
3616 | dtype = 13; | |
3617 | break; | |
3618 | case 15: | |
3619 | dtype = 29; | |
3620 | } | |
3621 | else | |
3622 | dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55; | |
3623 | break; | |
3624 | ||
3625 | case ARRAY_TYPE: | |
3626 | dtype = 14; | |
3627 | break; | |
3628 | ||
3629 | default: | |
3630 | break; | |
3631 | } | |
3632 | ||
3633 | /* Get the CLASS value. */ | |
3634 | switch (mech) | |
3635 | { | |
3636 | case By_Descriptor_A: | |
c6bd4220 | 3637 | klass = 4; |
6ca2b0a0 DR |
3638 | break; |
3639 | case By_Descriptor_NCA: | |
c6bd4220 | 3640 | klass = 10; |
6ca2b0a0 DR |
3641 | break; |
3642 | case By_Descriptor_SB: | |
c6bd4220 | 3643 | klass = 15; |
6ca2b0a0 DR |
3644 | break; |
3645 | case By_Descriptor: | |
3646 | case By_Descriptor_S: | |
3647 | default: | |
c6bd4220 | 3648 | klass = 1; |
6ca2b0a0 DR |
3649 | break; |
3650 | } | |
3651 | ||
58c8f770 | 3652 | /* Make the type for a 64-bit descriptor for VMS. The first six fields |
6ca2b0a0 | 3653 | are the same for all types. */ |
31a5a547 | 3654 | field_list |
788e5046 | 3655 | = make_descriptor_field ("MBO", gnat_type_for_size (16, 1), |
31a5a547 EB |
3656 | record_type, size_int (1), field_list); |
3657 | field_list | |
788e5046 | 3658 | = make_descriptor_field ("DTYPE", gnat_type_for_size (8, 1), |
31a5a547 EB |
3659 | record_type, size_int (dtype), field_list); |
3660 | field_list | |
788e5046 | 3661 | = make_descriptor_field ("CLASS", gnat_type_for_size (8, 1), |
31a5a547 EB |
3662 | record_type, size_int (klass), field_list); |
3663 | field_list | |
788e5046 | 3664 | = make_descriptor_field ("MBMO", gnat_type_for_size (32, 1), |
f54ee980 | 3665 | record_type, size_int (-1), field_list); |
31a5a547 | 3666 | field_list |
788e5046 | 3667 | = make_descriptor_field ("LENGTH", gnat_type_for_size (64, 1), |
31a5a547 | 3668 | record_type, |
788e5046 | 3669 | size_in_bytes (mech == By_Descriptor_A |
82b481ed | 3670 | ? inner_type : type), |
31a5a547 | 3671 | field_list); |
6ca2b0a0 DR |
3672 | |
3673 | pointer64_type = build_pointer_type_for_mode (type, DImode, false); | |
3674 | ||
31a5a547 EB |
3675 | field_list |
3676 | = make_descriptor_field ("POINTER", pointer64_type, record_type, | |
788e5046 | 3677 | build_unary_op (ADDR_EXPR, pointer64_type, |
82b481ed | 3678 | build0 (PLACEHOLDER_EXPR, type)), |
31a5a547 | 3679 | field_list); |
6ca2b0a0 DR |
3680 | |
3681 | switch (mech) | |
3682 | { | |
3683 | case By_Descriptor: | |
3684 | case By_Descriptor_S: | |
3685 | break; | |
3686 | ||
3687 | case By_Descriptor_SB: | |
31a5a547 | 3688 | field_list |
788e5046 | 3689 | = make_descriptor_field ("SB_L1", gnat_type_for_size (64, 1), |
31a5a547 | 3690 | record_type, |
788e5046 NF |
3691 | (TREE_CODE (type) == ARRAY_TYPE |
3692 | ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) | |
82b481ed | 3693 | : size_zero_node), |
31a5a547 EB |
3694 | field_list); |
3695 | field_list | |
788e5046 | 3696 | = make_descriptor_field ("SB_U1", gnat_type_for_size (64, 1), |
31a5a547 | 3697 | record_type, |
788e5046 NF |
3698 | (TREE_CODE (type) == ARRAY_TYPE |
3699 | ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
82b481ed | 3700 | : size_zero_node), |
31a5a547 | 3701 | field_list); |
6ca2b0a0 DR |
3702 | break; |
3703 | ||
3704 | case By_Descriptor_A: | |
3705 | case By_Descriptor_NCA: | |
31a5a547 | 3706 | field_list |
788e5046 | 3707 | = make_descriptor_field ("SCALE", gnat_type_for_size (8, 1), |
31a5a547 | 3708 | record_type, size_zero_node, field_list); |
788e5046 | 3709 | |
31a5a547 | 3710 | field_list |
788e5046 | 3711 | = make_descriptor_field ("DIGITS", gnat_type_for_size (8, 1), |
31a5a547 | 3712 | record_type, size_zero_node, field_list); |
788e5046 NF |
3713 | |
3714 | dtype = (mech == By_Descriptor_NCA | |
3715 | ? 0 | |
3716 | /* Set FL_COLUMN, FL_COEFF, and | |
3717 | FL_BOUNDS. */ | |
3718 | : (TREE_CODE (type) == ARRAY_TYPE | |
3719 | && TYPE_CONVENTION_FORTRAN_P (type) | |
3720 | ? 224 : 192)); | |
31a5a547 | 3721 | field_list |
788e5046 | 3722 | = make_descriptor_field ("AFLAGS", gnat_type_for_size (8, 1), |
31a5a547 EB |
3723 | record_type, size_int (dtype), |
3724 | field_list); | |
6ca2b0a0 | 3725 | |
31a5a547 | 3726 | field_list |
788e5046 | 3727 | = make_descriptor_field ("DIMCT", gnat_type_for_size (8, 1), |
31a5a547 | 3728 | record_type, size_int (ndim), field_list); |
788e5046 | 3729 | |
31a5a547 | 3730 | field_list |
788e5046 | 3731 | = make_descriptor_field ("MBZ", gnat_type_for_size (32, 1), |
31a5a547 EB |
3732 | record_type, size_int (0), field_list); |
3733 | field_list | |
788e5046 | 3734 | = make_descriptor_field ("ARSIZE", gnat_type_for_size (64, 1), |
31a5a547 EB |
3735 | record_type, size_in_bytes (type), |
3736 | field_list); | |
6ca2b0a0 DR |
3737 | |
3738 | /* Now build a pointer to the 0,0,0... element. */ | |
3739 | tem = build0 (PLACEHOLDER_EXPR, type); | |
3740 | for (i = 0, inner_type = type; i < ndim; | |
3741 | i++, inner_type = TREE_TYPE (inner_type)) | |
3742 | tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem, | |
3743 | convert (TYPE_DOMAIN (inner_type), size_zero_node), | |
3744 | NULL_TREE, NULL_TREE); | |
3745 | ||
31a5a547 EB |
3746 | field_list |
3747 | = make_descriptor_field ("A0", pointer64_type, record_type, | |
788e5046 | 3748 | build1 (ADDR_EXPR, pointer64_type, tem), |
31a5a547 | 3749 | field_list); |
6ca2b0a0 DR |
3750 | |
3751 | /* Next come the addressing coefficients. */ | |
3752 | tem = size_one_node; | |
3753 | for (i = 0; i < ndim; i++) | |
3754 | { | |
3755 | char fname[3]; | |
3756 | tree idx_length | |
3757 | = size_binop (MULT_EXPR, tem, | |
3758 | size_binop (PLUS_EXPR, | |
3759 | size_binop (MINUS_EXPR, | |
3760 | TYPE_MAX_VALUE (idx_arr[i]), | |
3761 | TYPE_MIN_VALUE (idx_arr[i])), | |
3762 | size_int (1))); | |
3763 | ||
3764 | fname[0] = (mech == By_Descriptor_NCA ? 'S' : 'M'); | |
3765 | fname[1] = '0' + i, fname[2] = 0; | |
31a5a547 | 3766 | field_list |
788e5046 | 3767 | = make_descriptor_field (fname, gnat_type_for_size (64, 1), |
31a5a547 | 3768 | record_type, idx_length, field_list); |
6ca2b0a0 DR |
3769 | |
3770 | if (mech == By_Descriptor_NCA) | |
3771 | tem = idx_length; | |
3772 | } | |
3773 | ||
3774 | /* Finally here are the bounds. */ | |
3775 | for (i = 0; i < ndim; i++) | |
3776 | { | |
3777 | char fname[3]; | |
3778 | ||
3779 | fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0; | |
31a5a547 | 3780 | field_list |
788e5046 | 3781 | = make_descriptor_field (fname, gnat_type_for_size (64, 1), |
31a5a547 EB |
3782 | record_type, |
3783 | TYPE_MIN_VALUE (idx_arr[i]), field_list); | |
6ca2b0a0 DR |
3784 | |
3785 | fname[0] = 'U'; | |
31a5a547 | 3786 | field_list |
788e5046 | 3787 | = make_descriptor_field (fname, gnat_type_for_size (64, 1), |
31a5a547 EB |
3788 | record_type, |
3789 | TYPE_MAX_VALUE (idx_arr[i]), field_list); | |
6ca2b0a0 DR |
3790 | } |
3791 | break; | |
3792 | ||
3793 | default: | |
3794 | post_error ("unsupported descriptor type for &", gnat_entity); | |
3795 | } | |
3796 | ||
31a5a547 EB |
3797 | TYPE_NAME (record_type) = create_concat_name (gnat_entity, "DESC64"); |
3798 | finish_record_type (record_type, nreverse (field_list), 0, false); | |
3799 | return record_type; | |
6ca2b0a0 DR |
3800 | } |
3801 | ||
31a5a547 EB |
3802 | /* Fill in a VMS descriptor of GNU_TYPE for GNU_EXPR and return the result. |
3803 | GNAT_ACTUAL is the actual parameter for which the descriptor is built. */ | |
a1ab4c31 | 3804 | |
31a5a547 EB |
3805 | tree |
3806 | fill_vms_descriptor (tree gnu_type, tree gnu_expr, Node_Id gnat_actual) | |
a1ab4c31 | 3807 | { |
9771b263 | 3808 | vec<constructor_elt, va_gc> *v = NULL; |
31a5a547 | 3809 | tree field; |
a1ab4c31 | 3810 | |
31a5a547 EB |
3811 | gnu_expr = maybe_unconstrained_array (gnu_expr); |
3812 | gnu_expr = gnat_protect_expr (gnu_expr); | |
3813 | gnat_mark_addressable (gnu_expr); | |
3814 | ||
3815 | /* We may need to substitute both GNU_EXPR and a CALL_EXPR to the raise CE | |
3816 | routine in case we have a 32-bit descriptor. */ | |
3817 | gnu_expr = build2 (COMPOUND_EXPR, void_type_node, | |
3818 | build_call_raise (CE_Range_Check_Failed, gnat_actual, | |
3819 | N_Raise_Constraint_Error), | |
3820 | gnu_expr); | |
3821 | ||
3822 | for (field = TYPE_FIELDS (gnu_type); field; field = DECL_CHAIN (field)) | |
3823 | { | |
3824 | tree value | |
3825 | = convert (TREE_TYPE (field), | |
3826 | SUBSTITUTE_PLACEHOLDER_IN_EXPR (DECL_INITIAL (field), | |
3827 | gnu_expr)); | |
3828 | CONSTRUCTOR_APPEND_ELT (v, field, value); | |
3829 | } | |
3830 | ||
3831 | return gnat_build_constructor (gnu_type, v); | |
a1ab4c31 AC |
3832 | } |
3833 | ||
d628c015 DR |
3834 | /* Convert GNU_EXPR, a pointer to a 64bit VMS descriptor, to GNU_TYPE, a |
3835 | regular pointer or fat pointer type. GNAT_SUBPROG is the subprogram to | |
3836 | which the VMS descriptor is passed. */ | |
a1ab4c31 AC |
3837 | |
3838 | static tree | |
d628c015 DR |
3839 | convert_vms_descriptor64 (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog) |
3840 | { | |
3841 | tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); | |
3842 | tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); | |
3843 | /* The CLASS field is the 3rd field in the descriptor. */ | |
910ad8de | 3844 | tree klass = DECL_CHAIN (DECL_CHAIN (TYPE_FIELDS (desc_type))); |
d628c015 | 3845 | /* The POINTER field is the 6th field in the descriptor. */ |
910ad8de | 3846 | tree pointer = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (klass))); |
d628c015 DR |
3847 | |
3848 | /* Retrieve the value of the POINTER field. */ | |
3849 | tree gnu_expr64 | |
58c8f770 | 3850 | = build3 (COMPONENT_REF, TREE_TYPE (pointer), desc, pointer, NULL_TREE); |
d628c015 DR |
3851 | |
3852 | if (POINTER_TYPE_P (gnu_type)) | |
3853 | return convert (gnu_type, gnu_expr64); | |
3854 | ||
315cff15 | 3855 | else if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
d628c015 DR |
3856 | { |
3857 | tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type)); | |
7d76717d | 3858 | tree p_bounds_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type))); |
d628c015 DR |
3859 | tree template_type = TREE_TYPE (p_bounds_type); |
3860 | tree min_field = TYPE_FIELDS (template_type); | |
7d76717d | 3861 | tree max_field = DECL_CHAIN (TYPE_FIELDS (template_type)); |
6bf68a93 | 3862 | tree template_tree, template_addr, aflags, dimct, t, u; |
d628c015 | 3863 | /* See the head comment of build_vms_descriptor. */ |
c6bd4220 | 3864 | int iklass = TREE_INT_CST_LOW (DECL_INITIAL (klass)); |
d628c015 | 3865 | tree lfield, ufield; |
9771b263 | 3866 | vec<constructor_elt, va_gc> *v; |
d628c015 | 3867 | |
86060344 | 3868 | /* Convert POINTER to the pointer-to-array type. */ |
d628c015 DR |
3869 | gnu_expr64 = convert (p_array_type, gnu_expr64); |
3870 | ||
c6bd4220 | 3871 | switch (iklass) |
d628c015 DR |
3872 | { |
3873 | case 1: /* Class S */ | |
3874 | case 15: /* Class SB */ | |
3875 | /* Build {1, LENGTH} template; LENGTH64 is the 5th field. */ | |
9771b263 | 3876 | vec_alloc (v, 2); |
910ad8de | 3877 | t = DECL_CHAIN (DECL_CHAIN (klass)); |
d628c015 | 3878 | t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
0e228dd9 NF |
3879 | CONSTRUCTOR_APPEND_ELT (v, min_field, |
3880 | convert (TREE_TYPE (min_field), | |
3881 | integer_one_node)); | |
3882 | CONSTRUCTOR_APPEND_ELT (v, max_field, | |
3883 | convert (TREE_TYPE (max_field), t)); | |
3884 | template_tree = gnat_build_constructor (template_type, v); | |
6bf68a93 | 3885 | template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template_tree); |
d628c015 DR |
3886 | |
3887 | /* For class S, we are done. */ | |
c6bd4220 | 3888 | if (iklass == 1) |
d628c015 DR |
3889 | break; |
3890 | ||
3891 | /* Test that we really have a SB descriptor, like DEC Ada. */ | |
c6bd4220 EB |
3892 | t = build3 (COMPONENT_REF, TREE_TYPE (klass), desc, klass, NULL); |
3893 | u = convert (TREE_TYPE (klass), DECL_INITIAL (klass)); | |
1139f2e8 | 3894 | u = build_binary_op (EQ_EXPR, boolean_type_node, t, u); |
d628c015 DR |
3895 | /* If so, there is already a template in the descriptor and |
3896 | it is located right after the POINTER field. The fields are | |
3897 | 64bits so they must be repacked. */ | |
7d76717d | 3898 | t = DECL_CHAIN (pointer); |
d628c015 DR |
3899 | lfield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3900 | lfield = convert (TREE_TYPE (TYPE_FIELDS (template_type)), lfield); | |
3901 | ||
7d76717d | 3902 | t = DECL_CHAIN (t); |
d628c015 DR |
3903 | ufield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3904 | ufield = convert | |
910ad8de | 3905 | (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (template_type))), ufield); |
d628c015 DR |
3906 | |
3907 | /* Build the template in the form of a constructor. */ | |
9771b263 | 3908 | vec_alloc (v, 2); |
0e228dd9 | 3909 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (template_type), lfield); |
7d76717d | 3910 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (template_type)), |
0e228dd9 NF |
3911 | ufield); |
3912 | template_tree = gnat_build_constructor (template_type, v); | |
d628c015 DR |
3913 | |
3914 | /* Otherwise use the {1, LENGTH} template we build above. */ | |
3915 | template_addr = build3 (COND_EXPR, p_bounds_type, u, | |
3916 | build_unary_op (ADDR_EXPR, p_bounds_type, | |
6bf68a93 | 3917 | template_tree), |
d628c015 DR |
3918 | template_addr); |
3919 | break; | |
3920 | ||
3921 | case 4: /* Class A */ | |
3922 | /* The AFLAGS field is the 3rd field after the pointer in the | |
3923 | descriptor. */ | |
910ad8de | 3924 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (pointer))); |
d628c015 DR |
3925 | aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3926 | /* The DIMCT field is the next field in the descriptor after | |
3927 | aflags. */ | |
7d76717d | 3928 | t = DECL_CHAIN (t); |
d628c015 DR |
3929 | dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3930 | /* Raise CONSTRAINT_ERROR if either more than 1 dimension | |
3931 | or FL_COEFF or FL_BOUNDS not set. */ | |
3932 | u = build_int_cst (TREE_TYPE (aflags), 192); | |
1139f2e8 EB |
3933 | u = build_binary_op (TRUTH_OR_EXPR, boolean_type_node, |
3934 | build_binary_op (NE_EXPR, boolean_type_node, | |
d628c015 DR |
3935 | dimct, |
3936 | convert (TREE_TYPE (dimct), | |
3937 | size_one_node)), | |
1139f2e8 | 3938 | build_binary_op (NE_EXPR, boolean_type_node, |
d628c015 DR |
3939 | build2 (BIT_AND_EXPR, |
3940 | TREE_TYPE (aflags), | |
3941 | aflags, u), | |
3942 | u)); | |
3943 | /* There is already a template in the descriptor and it is located | |
3944 | in block 3. The fields are 64bits so they must be repacked. */ | |
910ad8de | 3945 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (DECL_CHAIN |
d628c015 DR |
3946 | (t))))); |
3947 | lfield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
3948 | lfield = convert (TREE_TYPE (TYPE_FIELDS (template_type)), lfield); | |
3949 | ||
7d76717d | 3950 | t = DECL_CHAIN (t); |
d628c015 DR |
3951 | ufield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3952 | ufield = convert | |
910ad8de | 3953 | (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (template_type))), ufield); |
d628c015 DR |
3954 | |
3955 | /* Build the template in the form of a constructor. */ | |
9771b263 | 3956 | vec_alloc (v, 2); |
0e228dd9 | 3957 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (template_type), lfield); |
910ad8de | 3958 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (template_type)), |
0e228dd9 NF |
3959 | ufield); |
3960 | template_tree = gnat_build_constructor (template_type, v); | |
f76d6e6f | 3961 | template_tree = build3 (COND_EXPR, template_type, u, |
d628c015 DR |
3962 | build_call_raise (CE_Length_Check_Failed, Empty, |
3963 | N_Raise_Constraint_Error), | |
6bf68a93 | 3964 | template_tree); |
c6bd4220 EB |
3965 | template_addr |
3966 | = build_unary_op (ADDR_EXPR, p_bounds_type, template_tree); | |
d628c015 DR |
3967 | break; |
3968 | ||
3969 | case 10: /* Class NCA */ | |
3970 | default: | |
3971 | post_error ("unsupported descriptor type for &", gnat_subprog); | |
3972 | template_addr = integer_zero_node; | |
3973 | break; | |
3974 | } | |
3975 | ||
3976 | /* Build the fat pointer in the form of a constructor. */ | |
9771b263 | 3977 | vec_alloc (v, 2); |
0e228dd9 | 3978 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (gnu_type), gnu_expr64); |
910ad8de | 3979 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (gnu_type)), |
0e228dd9 NF |
3980 | template_addr); |
3981 | return gnat_build_constructor (gnu_type, v); | |
d628c015 DR |
3982 | } |
3983 | ||
3984 | else | |
3985 | gcc_unreachable (); | |
3986 | } | |
3987 | ||
3988 | /* Convert GNU_EXPR, a pointer to a 32bit VMS descriptor, to GNU_TYPE, a | |
3989 | regular pointer or fat pointer type. GNAT_SUBPROG is the subprogram to | |
3990 | which the VMS descriptor is passed. */ | |
3991 | ||
3992 | static tree | |
3993 | convert_vms_descriptor32 (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog) | |
a1ab4c31 AC |
3994 | { |
3995 | tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); | |
3996 | tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); | |
3997 | /* The CLASS field is the 3rd field in the descriptor. */ | |
910ad8de | 3998 | tree klass = DECL_CHAIN (DECL_CHAIN (TYPE_FIELDS (desc_type))); |
a1ab4c31 | 3999 | /* The POINTER field is the 4th field in the descriptor. */ |
910ad8de | 4000 | tree pointer = DECL_CHAIN (klass); |
a1ab4c31 AC |
4001 | |
4002 | /* Retrieve the value of the POINTER field. */ | |
d628c015 | 4003 | tree gnu_expr32 |
a1ab4c31 AC |
4004 | = build3 (COMPONENT_REF, TREE_TYPE (pointer), desc, pointer, NULL_TREE); |
4005 | ||
4006 | if (POINTER_TYPE_P (gnu_type)) | |
d628c015 | 4007 | return convert (gnu_type, gnu_expr32); |
a1ab4c31 | 4008 | |
315cff15 | 4009 | else if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
4010 | { |
4011 | tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type)); | |
7d76717d | 4012 | tree p_bounds_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type))); |
a1ab4c31 AC |
4013 | tree template_type = TREE_TYPE (p_bounds_type); |
4014 | tree min_field = TYPE_FIELDS (template_type); | |
7d76717d | 4015 | tree max_field = DECL_CHAIN (TYPE_FIELDS (template_type)); |
6bf68a93 | 4016 | tree template_tree, template_addr, aflags, dimct, t, u; |
a1ab4c31 | 4017 | /* See the head comment of build_vms_descriptor. */ |
c6bd4220 | 4018 | int iklass = TREE_INT_CST_LOW (DECL_INITIAL (klass)); |
9771b263 | 4019 | vec<constructor_elt, va_gc> *v; |
a1ab4c31 | 4020 | |
86060344 | 4021 | /* Convert POINTER to the pointer-to-array type. */ |
d628c015 | 4022 | gnu_expr32 = convert (p_array_type, gnu_expr32); |
a1ab4c31 | 4023 | |
c6bd4220 | 4024 | switch (iklass) |
a1ab4c31 AC |
4025 | { |
4026 | case 1: /* Class S */ | |
4027 | case 15: /* Class SB */ | |
4028 | /* Build {1, LENGTH} template; LENGTH is the 1st field. */ | |
9771b263 | 4029 | vec_alloc (v, 2); |
a1ab4c31 AC |
4030 | t = TYPE_FIELDS (desc_type); |
4031 | t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
0e228dd9 NF |
4032 | CONSTRUCTOR_APPEND_ELT (v, min_field, |
4033 | convert (TREE_TYPE (min_field), | |
4034 | integer_one_node)); | |
4035 | CONSTRUCTOR_APPEND_ELT (v, max_field, | |
4036 | convert (TREE_TYPE (max_field), t)); | |
4037 | template_tree = gnat_build_constructor (template_type, v); | |
6bf68a93 | 4038 | template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template_tree); |
a1ab4c31 AC |
4039 | |
4040 | /* For class S, we are done. */ | |
c6bd4220 | 4041 | if (iklass == 1) |
a1ab4c31 AC |
4042 | break; |
4043 | ||
4044 | /* Test that we really have a SB descriptor, like DEC Ada. */ | |
c6bd4220 EB |
4045 | t = build3 (COMPONENT_REF, TREE_TYPE (klass), desc, klass, NULL); |
4046 | u = convert (TREE_TYPE (klass), DECL_INITIAL (klass)); | |
1139f2e8 | 4047 | u = build_binary_op (EQ_EXPR, boolean_type_node, t, u); |
a1ab4c31 AC |
4048 | /* If so, there is already a template in the descriptor and |
4049 | it is located right after the POINTER field. */ | |
7d76717d | 4050 | t = DECL_CHAIN (pointer); |
c6bd4220 EB |
4051 | template_tree |
4052 | = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
a1ab4c31 AC |
4053 | /* Otherwise use the {1, LENGTH} template we build above. */ |
4054 | template_addr = build3 (COND_EXPR, p_bounds_type, u, | |
4055 | build_unary_op (ADDR_EXPR, p_bounds_type, | |
6bf68a93 | 4056 | template_tree), |
a1ab4c31 AC |
4057 | template_addr); |
4058 | break; | |
4059 | ||
4060 | case 4: /* Class A */ | |
4061 | /* The AFLAGS field is the 7th field in the descriptor. */ | |
910ad8de | 4062 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (pointer))); |
a1ab4c31 AC |
4063 | aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
4064 | /* The DIMCT field is the 8th field in the descriptor. */ | |
7d76717d | 4065 | t = DECL_CHAIN (t); |
a1ab4c31 AC |
4066 | dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
4067 | /* Raise CONSTRAINT_ERROR if either more than 1 dimension | |
4068 | or FL_COEFF or FL_BOUNDS not set. */ | |
4069 | u = build_int_cst (TREE_TYPE (aflags), 192); | |
1139f2e8 EB |
4070 | u = build_binary_op (TRUTH_OR_EXPR, boolean_type_node, |
4071 | build_binary_op (NE_EXPR, boolean_type_node, | |
a1ab4c31 AC |
4072 | dimct, |
4073 | convert (TREE_TYPE (dimct), | |
4074 | size_one_node)), | |
1139f2e8 | 4075 | build_binary_op (NE_EXPR, boolean_type_node, |
a1ab4c31 AC |
4076 | build2 (BIT_AND_EXPR, |
4077 | TREE_TYPE (aflags), | |
4078 | aflags, u), | |
4079 | u)); | |
a1ab4c31 AC |
4080 | /* There is already a template in the descriptor and it is |
4081 | located at the start of block 3 (12th field). */ | |
910ad8de | 4082 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (t)))); |
c6bd4220 EB |
4083 | template_tree |
4084 | = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
f76d6e6f | 4085 | template_tree = build3 (COND_EXPR, TREE_TYPE (t), u, |
d628c015 DR |
4086 | build_call_raise (CE_Length_Check_Failed, Empty, |
4087 | N_Raise_Constraint_Error), | |
6bf68a93 | 4088 | template_tree); |
c6bd4220 EB |
4089 | template_addr |
4090 | = build_unary_op (ADDR_EXPR, p_bounds_type, template_tree); | |
a1ab4c31 AC |
4091 | break; |
4092 | ||
4093 | case 10: /* Class NCA */ | |
4094 | default: | |
4095 | post_error ("unsupported descriptor type for &", gnat_subprog); | |
4096 | template_addr = integer_zero_node; | |
4097 | break; | |
4098 | } | |
4099 | ||
4100 | /* Build the fat pointer in the form of a constructor. */ | |
9771b263 | 4101 | vec_alloc (v, 2); |
0e228dd9 | 4102 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (gnu_type), gnu_expr32); |
910ad8de | 4103 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (gnu_type)), |
0e228dd9 | 4104 | template_addr); |
d628c015 | 4105 | |
0e228dd9 | 4106 | return gnat_build_constructor (gnu_type, v); |
a1ab4c31 AC |
4107 | } |
4108 | ||
4109 | else | |
4110 | gcc_unreachable (); | |
4111 | } | |
4112 | ||
a981c964 EB |
4113 | /* Convert GNU_EXPR, a pointer to a VMS descriptor, to GNU_TYPE, a regular |
4114 | pointer or fat pointer type. GNU_EXPR_ALT_TYPE is the alternate (32-bit) | |
491f54a7 EB |
4115 | pointer type of GNU_EXPR. GNAT_SUBPROG is the subprogram to which the |
4116 | descriptor is passed. */ | |
d628c015 | 4117 | |
f3d34576 | 4118 | tree |
a981c964 | 4119 | convert_vms_descriptor (tree gnu_type, tree gnu_expr, tree gnu_expr_alt_type, |
491f54a7 | 4120 | Entity_Id gnat_subprog) |
d628c015 DR |
4121 | { |
4122 | tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); | |
4123 | tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); | |
4124 | tree mbo = TYPE_FIELDS (desc_type); | |
4125 | const char *mbostr = IDENTIFIER_POINTER (DECL_NAME (mbo)); | |
910ad8de | 4126 | tree mbmo = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (mbo))); |
491f54a7 | 4127 | tree is64bit, gnu_expr32, gnu_expr64; |
d628c015 | 4128 | |
a981c964 EB |
4129 | /* If the field name is not MBO, it must be 32-bit and no alternate. |
4130 | Otherwise primary must be 64-bit and alternate 32-bit. */ | |
d628c015 | 4131 | if (strcmp (mbostr, "MBO") != 0) |
0c700259 | 4132 | { |
491f54a7 | 4133 | tree ret = convert_vms_descriptor32 (gnu_type, gnu_expr, gnat_subprog); |
0c700259 EB |
4134 | return ret; |
4135 | } | |
d628c015 | 4136 | |
a981c964 | 4137 | /* Build the test for 64-bit descriptor. */ |
d628c015 DR |
4138 | mbo = build3 (COMPONENT_REF, TREE_TYPE (mbo), desc, mbo, NULL_TREE); |
4139 | mbmo = build3 (COMPONENT_REF, TREE_TYPE (mbmo), desc, mbmo, NULL_TREE); | |
a981c964 | 4140 | is64bit |
1139f2e8 EB |
4141 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
4142 | build_binary_op (EQ_EXPR, boolean_type_node, | |
a981c964 EB |
4143 | convert (integer_type_node, mbo), |
4144 | integer_one_node), | |
1139f2e8 | 4145 | build_binary_op (EQ_EXPR, boolean_type_node, |
a981c964 EB |
4146 | convert (integer_type_node, mbmo), |
4147 | integer_minus_one_node)); | |
4148 | ||
4149 | /* Build the 2 possible end results. */ | |
491f54a7 | 4150 | gnu_expr64 = convert_vms_descriptor64 (gnu_type, gnu_expr, gnat_subprog); |
a981c964 | 4151 | gnu_expr = fold_convert (gnu_expr_alt_type, gnu_expr); |
491f54a7 | 4152 | gnu_expr32 = convert_vms_descriptor32 (gnu_type, gnu_expr, gnat_subprog); |
a981c964 | 4153 | return build3 (COND_EXPR, gnu_type, is64bit, gnu_expr64, gnu_expr32); |
d628c015 | 4154 | } |
a1ab4c31 | 4155 | \f |
928dfa4b EB |
4156 | /* Build a type to be used to represent an aliased object whose nominal type |
4157 | is an unconstrained array. This consists of a RECORD_TYPE containing a | |
4158 | field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an ARRAY_TYPE. | |
4159 | If ARRAY_TYPE is that of an unconstrained array, this is used to represent | |
4160 | an arbitrary unconstrained object. Use NAME as the name of the record. | |
4161 | DEBUG_INFO_P is true if we need to write debug information for the type. */ | |
a1ab4c31 AC |
4162 | |
4163 | tree | |
928dfa4b EB |
4164 | build_unc_object_type (tree template_type, tree object_type, tree name, |
4165 | bool debug_info_p) | |
a1ab4c31 AC |
4166 | { |
4167 | tree type = make_node (RECORD_TYPE); | |
da01bfee EB |
4168 | tree template_field |
4169 | = create_field_decl (get_identifier ("BOUNDS"), template_type, type, | |
4170 | NULL_TREE, NULL_TREE, 0, 1); | |
4171 | tree array_field | |
4172 | = create_field_decl (get_identifier ("ARRAY"), object_type, type, | |
4173 | NULL_TREE, NULL_TREE, 0, 1); | |
a1ab4c31 AC |
4174 | |
4175 | TYPE_NAME (type) = name; | |
4176 | TYPE_CONTAINS_TEMPLATE_P (type) = 1; | |
910ad8de | 4177 | DECL_CHAIN (template_field) = array_field; |
928dfa4b EB |
4178 | finish_record_type (type, template_field, 0, true); |
4179 | ||
4180 | /* Declare it now since it will never be declared otherwise. This is | |
4181 | necessary to ensure that its subtrees are properly marked. */ | |
74746d49 | 4182 | create_type_decl (name, type, true, debug_info_p, Empty); |
a1ab4c31 AC |
4183 | |
4184 | return type; | |
4185 | } | |
4186 | ||
4187 | /* Same, taking a thin or fat pointer type instead of a template type. */ | |
4188 | ||
4189 | tree | |
4190 | build_unc_object_type_from_ptr (tree thin_fat_ptr_type, tree object_type, | |
928dfa4b | 4191 | tree name, bool debug_info_p) |
a1ab4c31 AC |
4192 | { |
4193 | tree template_type; | |
4194 | ||
315cff15 | 4195 | gcc_assert (TYPE_IS_FAT_OR_THIN_POINTER_P (thin_fat_ptr_type)); |
a1ab4c31 AC |
4196 | |
4197 | template_type | |
315cff15 | 4198 | = (TYPE_IS_FAT_POINTER_P (thin_fat_ptr_type) |
910ad8de | 4199 | ? TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (thin_fat_ptr_type)))) |
a1ab4c31 | 4200 | : TREE_TYPE (TYPE_FIELDS (TREE_TYPE (thin_fat_ptr_type)))); |
928dfa4b EB |
4201 | |
4202 | return | |
4203 | build_unc_object_type (template_type, object_type, name, debug_info_p); | |
a1ab4c31 | 4204 | } |
a1ab4c31 | 4205 | \f |
229077b0 EB |
4206 | /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE. |
4207 | In the normal case this is just two adjustments, but we have more to | |
4208 | do if NEW_TYPE is an UNCONSTRAINED_ARRAY_TYPE. */ | |
a1ab4c31 AC |
4209 | |
4210 | void | |
4211 | update_pointer_to (tree old_type, tree new_type) | |
4212 | { | |
4213 | tree ptr = TYPE_POINTER_TO (old_type); | |
4214 | tree ref = TYPE_REFERENCE_TO (old_type); | |
aeecf17c | 4215 | tree t; |
a1ab4c31 AC |
4216 | |
4217 | /* If this is the main variant, process all the other variants first. */ | |
4218 | if (TYPE_MAIN_VARIANT (old_type) == old_type) | |
aeecf17c EB |
4219 | for (t = TYPE_NEXT_VARIANT (old_type); t; t = TYPE_NEXT_VARIANT (t)) |
4220 | update_pointer_to (t, new_type); | |
a1ab4c31 | 4221 | |
229077b0 | 4222 | /* If no pointers and no references, we are done. */ |
a1ab4c31 AC |
4223 | if (!ptr && !ref) |
4224 | return; | |
4225 | ||
4226 | /* Merge the old type qualifiers in the new type. | |
4227 | ||
4228 | Each old variant has qualifiers for specific reasons, and the new | |
229077b0 | 4229 | designated type as well. Each set of qualifiers represents useful |
a1ab4c31 AC |
4230 | information grabbed at some point, and merging the two simply unifies |
4231 | these inputs into the final type description. | |
4232 | ||
4233 | Consider for instance a volatile type frozen after an access to constant | |
229077b0 EB |
4234 | type designating it; after the designated type's freeze, we get here with |
4235 | a volatile NEW_TYPE and a dummy OLD_TYPE with a readonly variant, created | |
4236 | when the access type was processed. We will make a volatile and readonly | |
a1ab4c31 AC |
4237 | designated type, because that's what it really is. |
4238 | ||
229077b0 EB |
4239 | We might also get here for a non-dummy OLD_TYPE variant with different |
4240 | qualifiers than those of NEW_TYPE, for instance in some cases of pointers | |
a1ab4c31 | 4241 | to private record type elaboration (see the comments around the call to |
229077b0 EB |
4242 | this routine in gnat_to_gnu_entity <E_Access_Type>). We have to merge |
4243 | the qualifiers in those cases too, to avoid accidentally discarding the | |
4244 | initial set, and will often end up with OLD_TYPE == NEW_TYPE then. */ | |
4245 | new_type | |
4246 | = build_qualified_type (new_type, | |
4247 | TYPE_QUALS (old_type) | TYPE_QUALS (new_type)); | |
4248 | ||
4249 | /* If old type and new type are identical, there is nothing to do. */ | |
a1ab4c31 AC |
4250 | if (old_type == new_type) |
4251 | return; | |
4252 | ||
4253 | /* Otherwise, first handle the simple case. */ | |
4254 | if (TREE_CODE (new_type) != UNCONSTRAINED_ARRAY_TYPE) | |
4255 | { | |
aeecf17c EB |
4256 | tree new_ptr, new_ref; |
4257 | ||
4258 | /* If pointer or reference already points to new type, nothing to do. | |
4259 | This can happen as update_pointer_to can be invoked multiple times | |
4260 | on the same couple of types because of the type variants. */ | |
4261 | if ((ptr && TREE_TYPE (ptr) == new_type) | |
4262 | || (ref && TREE_TYPE (ref) == new_type)) | |
4263 | return; | |
4264 | ||
4265 | /* Chain PTR and its variants at the end. */ | |
4266 | new_ptr = TYPE_POINTER_TO (new_type); | |
4267 | if (new_ptr) | |
4268 | { | |
4269 | while (TYPE_NEXT_PTR_TO (new_ptr)) | |
4270 | new_ptr = TYPE_NEXT_PTR_TO (new_ptr); | |
4271 | TYPE_NEXT_PTR_TO (new_ptr) = ptr; | |
4272 | } | |
4273 | else | |
4274 | TYPE_POINTER_TO (new_type) = ptr; | |
a1ab4c31 | 4275 | |
aeecf17c | 4276 | /* Now adjust them. */ |
a1ab4c31 | 4277 | for (; ptr; ptr = TYPE_NEXT_PTR_TO (ptr)) |
aeecf17c | 4278 | for (t = TYPE_MAIN_VARIANT (ptr); t; t = TYPE_NEXT_VARIANT (t)) |
50179d58 EB |
4279 | { |
4280 | TREE_TYPE (t) = new_type; | |
4281 | if (TYPE_NULL_BOUNDS (t)) | |
4282 | TREE_TYPE (TREE_OPERAND (TYPE_NULL_BOUNDS (t), 0)) = new_type; | |
4283 | } | |
de9528f0 | 4284 | |
aeecf17c EB |
4285 | /* Chain REF and its variants at the end. */ |
4286 | new_ref = TYPE_REFERENCE_TO (new_type); | |
4287 | if (new_ref) | |
4288 | { | |
4289 | while (TYPE_NEXT_REF_TO (new_ref)) | |
4290 | new_ref = TYPE_NEXT_REF_TO (new_ref); | |
4291 | TYPE_NEXT_REF_TO (new_ref) = ref; | |
4292 | } | |
4293 | else | |
4294 | TYPE_REFERENCE_TO (new_type) = ref; | |
4295 | ||
4296 | /* Now adjust them. */ | |
a1ab4c31 | 4297 | for (; ref; ref = TYPE_NEXT_REF_TO (ref)) |
aeecf17c EB |
4298 | for (t = TYPE_MAIN_VARIANT (ref); t; t = TYPE_NEXT_VARIANT (t)) |
4299 | TREE_TYPE (t) = new_type; | |
de9528f0 EB |
4300 | |
4301 | TYPE_POINTER_TO (old_type) = NULL_TREE; | |
3bd6ca3f | 4302 | TYPE_REFERENCE_TO (old_type) = NULL_TREE; |
a1ab4c31 AC |
4303 | } |
4304 | ||
aeecf17c EB |
4305 | /* Now deal with the unconstrained array case. In this case the pointer |
4306 | is actually a record where both fields are pointers to dummy nodes. | |
e3edbd56 EB |
4307 | Turn them into pointers to the correct types using update_pointer_to. |
4308 | Likewise for the pointer to the object record (thin pointer). */ | |
a1ab4c31 AC |
4309 | else |
4310 | { | |
e3edbd56 | 4311 | tree new_ptr = TYPE_POINTER_TO (new_type); |
aeecf17c EB |
4312 | |
4313 | gcc_assert (TYPE_IS_FAT_POINTER_P (ptr)); | |
4314 | ||
e3edbd56 | 4315 | /* If PTR already points to NEW_TYPE, nothing to do. This can happen |
aeecf17c EB |
4316 | since update_pointer_to can be invoked multiple times on the same |
4317 | couple of types because of the type variants. */ | |
4318 | if (TYPE_UNCONSTRAINED_ARRAY (ptr) == new_type) | |
4319 | return; | |
4320 | ||
a1ab4c31 | 4321 | update_pointer_to |
e3edbd56 EB |
4322 | (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (ptr))), |
4323 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS (new_ptr)))); | |
a1ab4c31 | 4324 | |
a1ab4c31 | 4325 | update_pointer_to |
e3edbd56 EB |
4326 | (TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (ptr)))), |
4327 | TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (new_ptr))))); | |
aeecf17c | 4328 | |
e3edbd56 EB |
4329 | update_pointer_to (TYPE_OBJECT_RECORD_TYPE (old_type), |
4330 | TYPE_OBJECT_RECORD_TYPE (new_type)); | |
a1ab4c31 | 4331 | |
e3edbd56 | 4332 | TYPE_POINTER_TO (old_type) = NULL_TREE; |
a1ab4c31 AC |
4333 | } |
4334 | } | |
4335 | \f | |
8df2e902 EB |
4336 | /* Convert EXPR, a pointer to a constrained array, into a pointer to an |
4337 | unconstrained one. This involves making or finding a template. */ | |
a1ab4c31 AC |
4338 | |
4339 | static tree | |
4340 | convert_to_fat_pointer (tree type, tree expr) | |
4341 | { | |
910ad8de | 4342 | tree template_type = TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type)))); |
8df2e902 | 4343 | tree p_array_type = TREE_TYPE (TYPE_FIELDS (type)); |
a1ab4c31 | 4344 | tree etype = TREE_TYPE (expr); |
6bf68a93 | 4345 | tree template_tree; |
9771b263 DN |
4346 | vec<constructor_elt, va_gc> *v; |
4347 | vec_alloc (v, 2); | |
a1ab4c31 | 4348 | |
50179d58 EB |
4349 | /* If EXPR is null, make a fat pointer that contains a null pointer to the |
4350 | array (compare_fat_pointers ensures that this is the full discriminant) | |
4351 | and a valid pointer to the bounds. This latter property is necessary | |
4352 | since the compiler can hoist the load of the bounds done through it. */ | |
a1ab4c31 | 4353 | if (integer_zerop (expr)) |
0e228dd9 | 4354 | { |
50179d58 EB |
4355 | tree ptr_template_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type))); |
4356 | tree null_bounds, t; | |
4357 | ||
4358 | if (TYPE_NULL_BOUNDS (ptr_template_type)) | |
4359 | null_bounds = TYPE_NULL_BOUNDS (ptr_template_type); | |
4360 | else | |
4361 | { | |
4362 | /* The template type can still be dummy at this point so we build an | |
4363 | empty constructor. The middle-end will fill it in with zeros. */ | |
9771b263 DN |
4364 | t = build_constructor (template_type, |
4365 | NULL); | |
50179d58 EB |
4366 | TREE_CONSTANT (t) = TREE_STATIC (t) = 1; |
4367 | null_bounds = build_unary_op (ADDR_EXPR, NULL_TREE, t); | |
4368 | SET_TYPE_NULL_BOUNDS (ptr_template_type, null_bounds); | |
4369 | } | |
4370 | ||
0e228dd9 | 4371 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
50179d58 EB |
4372 | fold_convert (p_array_type, null_pointer_node)); |
4373 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), null_bounds); | |
4374 | t = build_constructor (type, v); | |
4375 | /* Do not set TREE_CONSTANT so as to force T to static memory. */ | |
4376 | TREE_CONSTANT (t) = 0; | |
4377 | TREE_STATIC (t) = 1; | |
4378 | ||
4379 | return t; | |
0e228dd9 | 4380 | } |
a1ab4c31 | 4381 | |
0d7de0e1 EB |
4382 | /* If EXPR is a thin pointer, make template and data from the record. */ |
4383 | if (TYPE_IS_THIN_POINTER_P (etype)) | |
a1ab4c31 | 4384 | { |
0d7de0e1 | 4385 | tree field = TYPE_FIELDS (TREE_TYPE (etype)); |
a1ab4c31 | 4386 | |
7d7a1fe8 | 4387 | expr = gnat_protect_expr (expr); |
a1ab4c31 AC |
4388 | if (TREE_CODE (expr) == ADDR_EXPR) |
4389 | expr = TREE_OPERAND (expr, 0); | |
4390 | else | |
2b45154d EB |
4391 | { |
4392 | /* If we have a TYPE_UNCONSTRAINED_ARRAY attached to the RECORD_TYPE, | |
4393 | the thin pointer value has been shifted so we first need to shift | |
4394 | it back to get the template address. */ | |
4395 | if (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (etype))) | |
4396 | expr | |
4397 | = build_binary_op (POINTER_PLUS_EXPR, etype, expr, | |
4398 | fold_build1 (NEGATE_EXPR, sizetype, | |
4399 | byte_position | |
4400 | (DECL_CHAIN (field)))); | |
4401 | expr = build1 (INDIRECT_REF, TREE_TYPE (etype), expr); | |
4402 | } | |
a1ab4c31 | 4403 | |
0d7de0e1 | 4404 | template_tree = build_component_ref (expr, NULL_TREE, field, false); |
a1ab4c31 AC |
4405 | expr = build_unary_op (ADDR_EXPR, NULL_TREE, |
4406 | build_component_ref (expr, NULL_TREE, | |
0d7de0e1 | 4407 | DECL_CHAIN (field), false)); |
a1ab4c31 | 4408 | } |
8df2e902 EB |
4409 | |
4410 | /* Otherwise, build the constructor for the template. */ | |
a1ab4c31 | 4411 | else |
6bf68a93 | 4412 | template_tree = build_template (template_type, TREE_TYPE (etype), expr); |
a1ab4c31 | 4413 | |
8df2e902 | 4414 | /* The final result is a constructor for the fat pointer. |
a1ab4c31 | 4415 | |
8df2e902 EB |
4416 | If EXPR is an argument of a foreign convention subprogram, the type it |
4417 | points to is directly the component type. In this case, the expression | |
a1ab4c31 | 4418 | type may not match the corresponding FIELD_DECL type at this point, so we |
8df2e902 | 4419 | call "convert" here to fix that up if necessary. This type consistency is |
a1ab4c31 | 4420 | required, for instance because it ensures that possible later folding of |
8df2e902 | 4421 | COMPONENT_REFs against this constructor always yields something of the |
a1ab4c31 AC |
4422 | same type as the initial reference. |
4423 | ||
8df2e902 EB |
4424 | Note that the call to "build_template" above is still fine because it |
4425 | will only refer to the provided TEMPLATE_TYPE in this case. */ | |
0e228dd9 NF |
4426 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
4427 | convert (p_array_type, expr)); | |
910ad8de | 4428 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), |
0e228dd9 NF |
4429 | build_unary_op (ADDR_EXPR, NULL_TREE, |
4430 | template_tree)); | |
4431 | return gnat_build_constructor (type, v); | |
a1ab4c31 AC |
4432 | } |
4433 | \f | |
a1ab4c31 AC |
4434 | /* Create an expression whose value is that of EXPR, |
4435 | converted to type TYPE. The TREE_TYPE of the value | |
4436 | is always TYPE. This function implements all reasonable | |
4437 | conversions; callers should filter out those that are | |
4438 | not permitted by the language being compiled. */ | |
4439 | ||
4440 | tree | |
4441 | convert (tree type, tree expr) | |
4442 | { | |
a1ab4c31 AC |
4443 | tree etype = TREE_TYPE (expr); |
4444 | enum tree_code ecode = TREE_CODE (etype); | |
c34f3839 | 4445 | enum tree_code code = TREE_CODE (type); |
a1ab4c31 | 4446 | |
c34f3839 EB |
4447 | /* If the expression is already of the right type, we are done. */ |
4448 | if (etype == type) | |
a1ab4c31 AC |
4449 | return expr; |
4450 | ||
4451 | /* If both input and output have padding and are of variable size, do this | |
4452 | as an unchecked conversion. Likewise if one is a mere variant of the | |
4453 | other, so we avoid a pointless unpad/repad sequence. */ | |
4454 | else if (code == RECORD_TYPE && ecode == RECORD_TYPE | |
315cff15 | 4455 | && TYPE_PADDING_P (type) && TYPE_PADDING_P (etype) |
a1ab4c31 AC |
4456 | && (!TREE_CONSTANT (TYPE_SIZE (type)) |
4457 | || !TREE_CONSTANT (TYPE_SIZE (etype)) | |
842d4ee2 | 4458 | || TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (etype) |
a1ab4c31 AC |
4459 | || TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type))) |
4460 | == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (etype))))) | |
4461 | ; | |
4462 | ||
f88facfe EB |
4463 | /* If the output type has padding, convert to the inner type and make a |
4464 | constructor to build the record, unless a variable size is involved. */ | |
315cff15 | 4465 | else if (code == RECORD_TYPE && TYPE_PADDING_P (type)) |
a1ab4c31 | 4466 | { |
9771b263 | 4467 | vec<constructor_elt, va_gc> *v; |
0e228dd9 | 4468 | |
a1ab4c31 AC |
4469 | /* If we previously converted from another type and our type is |
4470 | of variable size, remove the conversion to avoid the need for | |
f88facfe | 4471 | variable-sized temporaries. Likewise for a conversion between |
a1ab4c31 AC |
4472 | original and packable version. */ |
4473 | if (TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
4474 | && (!TREE_CONSTANT (TYPE_SIZE (type)) | |
4475 | || (ecode == RECORD_TYPE | |
4476 | && TYPE_NAME (etype) | |
4477 | == TYPE_NAME (TREE_TYPE (TREE_OPERAND (expr, 0)))))) | |
4478 | expr = TREE_OPERAND (expr, 0); | |
4479 | ||
4480 | /* If we are just removing the padding from expr, convert the original | |
4481 | object if we have variable size in order to avoid the need for some | |
f88facfe | 4482 | variable-sized temporaries. Likewise if the padding is a variant |
a1ab4c31 AC |
4483 | of the other, so we avoid a pointless unpad/repad sequence. */ |
4484 | if (TREE_CODE (expr) == COMPONENT_REF | |
a1ab4c31 AC |
4485 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (expr, 0))) |
4486 | && (!TREE_CONSTANT (TYPE_SIZE (type)) | |
842d4ee2 EB |
4487 | || TYPE_MAIN_VARIANT (type) |
4488 | == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (expr, 0))) | |
a1ab4c31 AC |
4489 | || (ecode == RECORD_TYPE |
4490 | && TYPE_NAME (etype) | |
4491 | == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type)))))) | |
4492 | return convert (type, TREE_OPERAND (expr, 0)); | |
4493 | ||
431cfac1 EB |
4494 | /* If the inner type is of self-referential size and the expression type |
4495 | is a record, do this as an unchecked conversion. But first pad the | |
4496 | expression if possible to have the same size on both sides. */ | |
c34f3839 | 4497 | if (ecode == RECORD_TYPE |
f88facfe | 4498 | && CONTAINS_PLACEHOLDER_P (DECL_SIZE (TYPE_FIELDS (type)))) |
431cfac1 | 4499 | { |
980a0501 | 4500 | if (TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST) |
431cfac1 | 4501 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, |
980a0501 EB |
4502 | false, false, false, true), |
4503 | expr); | |
431cfac1 EB |
4504 | return unchecked_convert (type, expr, false); |
4505 | } | |
a1ab4c31 | 4506 | |
f88facfe EB |
4507 | /* If we are converting between array types with variable size, do the |
4508 | final conversion as an unchecked conversion, again to avoid the need | |
4509 | for some variable-sized temporaries. If valid, this conversion is | |
4510 | very likely purely technical and without real effects. */ | |
c34f3839 | 4511 | if (ecode == ARRAY_TYPE |
f88facfe EB |
4512 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == ARRAY_TYPE |
4513 | && !TREE_CONSTANT (TYPE_SIZE (etype)) | |
4514 | && !TREE_CONSTANT (TYPE_SIZE (type))) | |
4515 | return unchecked_convert (type, | |
4516 | convert (TREE_TYPE (TYPE_FIELDS (type)), | |
4517 | expr), | |
4518 | false); | |
4519 | ||
9771b263 | 4520 | vec_alloc (v, 1); |
0e228dd9 NF |
4521 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
4522 | convert (TREE_TYPE (TYPE_FIELDS (type)), expr)); | |
4523 | return gnat_build_constructor (type, v); | |
a1ab4c31 AC |
4524 | } |
4525 | ||
4526 | /* If the input type has padding, remove it and convert to the output type. | |
4527 | The conditions ordering is arranged to ensure that the output type is not | |
4528 | a padding type here, as it is not clear whether the conversion would | |
4529 | always be correct if this was to happen. */ | |
315cff15 | 4530 | else if (ecode == RECORD_TYPE && TYPE_PADDING_P (etype)) |
a1ab4c31 AC |
4531 | { |
4532 | tree unpadded; | |
4533 | ||
4534 | /* If we have just converted to this padded type, just get the | |
4535 | inner expression. */ | |
4536 | if (TREE_CODE (expr) == CONSTRUCTOR | |
9771b263 DN |
4537 | && !vec_safe_is_empty (CONSTRUCTOR_ELTS (expr)) |
4538 | && (*CONSTRUCTOR_ELTS (expr))[0].index == TYPE_FIELDS (etype)) | |
4539 | unpadded = (*CONSTRUCTOR_ELTS (expr))[0].value; | |
a1ab4c31 AC |
4540 | |
4541 | /* Otherwise, build an explicit component reference. */ | |
4542 | else | |
4543 | unpadded | |
4544 | = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (etype), false); | |
4545 | ||
4546 | return convert (type, unpadded); | |
4547 | } | |
4548 | ||
4549 | /* If the input is a biased type, adjust first. */ | |
4550 | if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype)) | |
4551 | return convert (type, fold_build2 (PLUS_EXPR, TREE_TYPE (etype), | |
4552 | fold_convert (TREE_TYPE (etype), | |
4553 | expr), | |
4554 | TYPE_MIN_VALUE (etype))); | |
4555 | ||
4556 | /* If the input is a justified modular type, we need to extract the actual | |
4557 | object before converting it to any other type with the exceptions of an | |
4558 | unconstrained array or of a mere type variant. It is useful to avoid the | |
4559 | extraction and conversion in the type variant case because it could end | |
4560 | up replacing a VAR_DECL expr by a constructor and we might be about the | |
4561 | take the address of the result. */ | |
4562 | if (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype) | |
4563 | && code != UNCONSTRAINED_ARRAY_TYPE | |
4564 | && TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (etype)) | |
4565 | return convert (type, build_component_ref (expr, NULL_TREE, | |
4566 | TYPE_FIELDS (etype), false)); | |
4567 | ||
4568 | /* If converting to a type that contains a template, convert to the data | |
4569 | type and then build the template. */ | |
4570 | if (code == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (type)) | |
4571 | { | |
910ad8de | 4572 | tree obj_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type))); |
9771b263 DN |
4573 | vec<constructor_elt, va_gc> *v; |
4574 | vec_alloc (v, 2); | |
a1ab4c31 AC |
4575 | |
4576 | /* If the source already has a template, get a reference to the | |
4577 | associated array only, as we are going to rebuild a template | |
4578 | for the target type anyway. */ | |
4579 | expr = maybe_unconstrained_array (expr); | |
4580 | ||
0e228dd9 NF |
4581 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
4582 | build_template (TREE_TYPE (TYPE_FIELDS (type)), | |
4583 | obj_type, NULL_TREE)); | |
910ad8de | 4584 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), |
0e228dd9 NF |
4585 | convert (obj_type, expr)); |
4586 | return gnat_build_constructor (type, v); | |
a1ab4c31 AC |
4587 | } |
4588 | ||
a1c7d797 | 4589 | /* There are some cases of expressions that we process specially. */ |
a1ab4c31 AC |
4590 | switch (TREE_CODE (expr)) |
4591 | { | |
4592 | case ERROR_MARK: | |
4593 | return expr; | |
4594 | ||
4595 | case NULL_EXPR: | |
4596 | /* Just set its type here. For TRANSFORM_EXPR, we will do the actual | |
4597 | conversion in gnat_expand_expr. NULL_EXPR does not represent | |
4598 | and actual value, so no conversion is needed. */ | |
4599 | expr = copy_node (expr); | |
4600 | TREE_TYPE (expr) = type; | |
4601 | return expr; | |
4602 | ||
4603 | case STRING_CST: | |
4604 | /* If we are converting a STRING_CST to another constrained array type, | |
4605 | just make a new one in the proper type. */ | |
4606 | if (code == ecode && AGGREGATE_TYPE_P (etype) | |
4607 | && !(TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST | |
4608 | && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)) | |
4609 | { | |
4610 | expr = copy_node (expr); | |
4611 | TREE_TYPE (expr) = type; | |
4612 | return expr; | |
4613 | } | |
4614 | break; | |
4615 | ||
7948ae37 OH |
4616 | case VECTOR_CST: |
4617 | /* If we are converting a VECTOR_CST to a mere variant type, just make | |
4618 | a new one in the proper type. */ | |
4619 | if (code == ecode && gnat_types_compatible_p (type, etype)) | |
4620 | { | |
4621 | expr = copy_node (expr); | |
4622 | TREE_TYPE (expr) = type; | |
4623 | return expr; | |
4624 | } | |
4625 | ||
a1ab4c31 AC |
4626 | case CONSTRUCTOR: |
4627 | /* If we are converting a CONSTRUCTOR to a mere variant type, just make | |
4628 | a new one in the proper type. */ | |
4629 | if (code == ecode && gnat_types_compatible_p (type, etype)) | |
4630 | { | |
4631 | expr = copy_node (expr); | |
4632 | TREE_TYPE (expr) = type; | |
9771b263 | 4633 | CONSTRUCTOR_ELTS (expr) = vec_safe_copy (CONSTRUCTOR_ELTS (expr)); |
a1ab4c31 AC |
4634 | return expr; |
4635 | } | |
4636 | ||
cb3d597d EB |
4637 | /* Likewise for a conversion between original and packable version, or |
4638 | conversion between types of the same size and with the same list of | |
4639 | fields, but we have to work harder to preserve type consistency. */ | |
a1ab4c31 AC |
4640 | if (code == ecode |
4641 | && code == RECORD_TYPE | |
cb3d597d EB |
4642 | && (TYPE_NAME (type) == TYPE_NAME (etype) |
4643 | || tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (etype)))) | |
4644 | ||
a1ab4c31 | 4645 | { |
9771b263 DN |
4646 | vec<constructor_elt, va_gc> *e = CONSTRUCTOR_ELTS (expr); |
4647 | unsigned HOST_WIDE_INT len = vec_safe_length (e); | |
4648 | vec<constructor_elt, va_gc> *v; | |
4649 | vec_alloc (v, len); | |
a1ab4c31 AC |
4650 | tree efield = TYPE_FIELDS (etype), field = TYPE_FIELDS (type); |
4651 | unsigned HOST_WIDE_INT idx; | |
4652 | tree index, value; | |
4653 | ||
db868e1e OH |
4654 | /* Whether we need to clear TREE_CONSTANT et al. on the output |
4655 | constructor when we convert in place. */ | |
4656 | bool clear_constant = false; | |
4657 | ||
a1ab4c31 AC |
4658 | FOR_EACH_CONSTRUCTOR_ELT(e, idx, index, value) |
4659 | { | |
cb3d597d EB |
4660 | /* We expect only simple constructors. */ |
4661 | if (!SAME_FIELD_P (index, efield)) | |
4662 | break; | |
4663 | /* The field must be the same. */ | |
4664 | if (!SAME_FIELD_P (efield, field)) | |
a1ab4c31 | 4665 | break; |
f32682ca | 4666 | constructor_elt elt = {field, convert (TREE_TYPE (field), value)}; |
9771b263 | 4667 | v->quick_push (elt); |
db868e1e OH |
4668 | |
4669 | /* If packing has made this field a bitfield and the input | |
4670 | value couldn't be emitted statically any more, we need to | |
4671 | clear TREE_CONSTANT on our output. */ | |
ced57283 EB |
4672 | if (!clear_constant |
4673 | && TREE_CONSTANT (expr) | |
db868e1e OH |
4674 | && !CONSTRUCTOR_BITFIELD_P (efield) |
4675 | && CONSTRUCTOR_BITFIELD_P (field) | |
4676 | && !initializer_constant_valid_for_bitfield_p (value)) | |
4677 | clear_constant = true; | |
4678 | ||
910ad8de NF |
4679 | efield = DECL_CHAIN (efield); |
4680 | field = DECL_CHAIN (field); | |
a1ab4c31 AC |
4681 | } |
4682 | ||
db868e1e OH |
4683 | /* If we have been able to match and convert all the input fields |
4684 | to their output type, convert in place now. We'll fallback to a | |
4685 | view conversion downstream otherwise. */ | |
a1ab4c31 AC |
4686 | if (idx == len) |
4687 | { | |
4688 | expr = copy_node (expr); | |
4689 | TREE_TYPE (expr) = type; | |
4690 | CONSTRUCTOR_ELTS (expr) = v; | |
db868e1e | 4691 | if (clear_constant) |
ced57283 | 4692 | TREE_CONSTANT (expr) = TREE_STATIC (expr) = 0; |
a1ab4c31 AC |
4693 | return expr; |
4694 | } | |
4695 | } | |
7948ae37 OH |
4696 | |
4697 | /* Likewise for a conversion between array type and vector type with a | |
4698 | compatible representative array. */ | |
4699 | else if (code == VECTOR_TYPE | |
4700 | && ecode == ARRAY_TYPE | |
4701 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), | |
4702 | etype)) | |
4703 | { | |
9771b263 DN |
4704 | vec<constructor_elt, va_gc> *e = CONSTRUCTOR_ELTS (expr); |
4705 | unsigned HOST_WIDE_INT len = vec_safe_length (e); | |
4706 | vec<constructor_elt, va_gc> *v; | |
7948ae37 OH |
4707 | unsigned HOST_WIDE_INT ix; |
4708 | tree value; | |
4709 | ||
4710 | /* Build a VECTOR_CST from a *constant* array constructor. */ | |
4711 | if (TREE_CONSTANT (expr)) | |
4712 | { | |
4713 | bool constant_p = true; | |
4714 | ||
4715 | /* Iterate through elements and check if all constructor | |
4716 | elements are *_CSTs. */ | |
4717 | FOR_EACH_CONSTRUCTOR_VALUE (e, ix, value) | |
4718 | if (!CONSTANT_CLASS_P (value)) | |
4719 | { | |
4720 | constant_p = false; | |
4721 | break; | |
4722 | } | |
4723 | ||
4724 | if (constant_p) | |
4725 | return build_vector_from_ctor (type, | |
4726 | CONSTRUCTOR_ELTS (expr)); | |
4727 | } | |
4728 | ||
4729 | /* Otherwise, build a regular vector constructor. */ | |
9771b263 | 4730 | vec_alloc (v, len); |
7948ae37 OH |
4731 | FOR_EACH_CONSTRUCTOR_VALUE (e, ix, value) |
4732 | { | |
f32682ca | 4733 | constructor_elt elt = {NULL_TREE, value}; |
9771b263 | 4734 | v->quick_push (elt); |
7948ae37 OH |
4735 | } |
4736 | expr = copy_node (expr); | |
4737 | TREE_TYPE (expr) = type; | |
4738 | CONSTRUCTOR_ELTS (expr) = v; | |
4739 | return expr; | |
4740 | } | |
a1ab4c31 AC |
4741 | break; |
4742 | ||
4743 | case UNCONSTRAINED_ARRAY_REF: | |
a1c7d797 EB |
4744 | /* First retrieve the underlying array. */ |
4745 | expr = maybe_unconstrained_array (expr); | |
4746 | etype = TREE_TYPE (expr); | |
4747 | ecode = TREE_CODE (etype); | |
4748 | break; | |
a1ab4c31 AC |
4749 | |
4750 | case VIEW_CONVERT_EXPR: | |
4751 | { | |
4752 | /* GCC 4.x is very sensitive to type consistency overall, and view | |
4753 | conversions thus are very frequent. Even though just "convert"ing | |
4754 | the inner operand to the output type is fine in most cases, it | |
4755 | might expose unexpected input/output type mismatches in special | |
4756 | circumstances so we avoid such recursive calls when we can. */ | |
4757 | tree op0 = TREE_OPERAND (expr, 0); | |
4758 | ||
4759 | /* If we are converting back to the original type, we can just | |
4760 | lift the input conversion. This is a common occurrence with | |
4761 | switches back-and-forth amongst type variants. */ | |
4762 | if (type == TREE_TYPE (op0)) | |
4763 | return op0; | |
4764 | ||
7948ae37 OH |
4765 | /* Otherwise, if we're converting between two aggregate or vector |
4766 | types, we might be allowed to substitute the VIEW_CONVERT_EXPR | |
4767 | target type in place or to just convert the inner expression. */ | |
4768 | if ((AGGREGATE_TYPE_P (type) && AGGREGATE_TYPE_P (etype)) | |
4769 | || (VECTOR_TYPE_P (type) && VECTOR_TYPE_P (etype))) | |
a1ab4c31 AC |
4770 | { |
4771 | /* If we are converting between mere variants, we can just | |
4772 | substitute the VIEW_CONVERT_EXPR in place. */ | |
4773 | if (gnat_types_compatible_p (type, etype)) | |
4774 | return build1 (VIEW_CONVERT_EXPR, type, op0); | |
4775 | ||
4776 | /* Otherwise, we may just bypass the input view conversion unless | |
4777 | one of the types is a fat pointer, which is handled by | |
4778 | specialized code below which relies on exact type matching. */ | |
315cff15 EB |
4779 | else if (!TYPE_IS_FAT_POINTER_P (type) |
4780 | && !TYPE_IS_FAT_POINTER_P (etype)) | |
a1ab4c31 AC |
4781 | return convert (type, op0); |
4782 | } | |
ad1d36ba EB |
4783 | |
4784 | break; | |
a1ab4c31 | 4785 | } |
a1ab4c31 | 4786 | |
a1ab4c31 AC |
4787 | default: |
4788 | break; | |
4789 | } | |
4790 | ||
4791 | /* Check for converting to a pointer to an unconstrained array. */ | |
315cff15 | 4792 | if (TYPE_IS_FAT_POINTER_P (type) && !TYPE_IS_FAT_POINTER_P (etype)) |
a1ab4c31 AC |
4793 | return convert_to_fat_pointer (type, expr); |
4794 | ||
7948ae37 OH |
4795 | /* If we are converting between two aggregate or vector types that are mere |
4796 | variants, just make a VIEW_CONVERT_EXPR. Likewise when we are converting | |
4797 | to a vector type from its representative array type. */ | |
4798 | else if ((code == ecode | |
4799 | && (AGGREGATE_TYPE_P (type) || VECTOR_TYPE_P (type)) | |
4800 | && gnat_types_compatible_p (type, etype)) | |
4801 | || (code == VECTOR_TYPE | |
4802 | && ecode == ARRAY_TYPE | |
4803 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), | |
4804 | etype))) | |
a1ab4c31 AC |
4805 | return build1 (VIEW_CONVERT_EXPR, type, expr); |
4806 | ||
76af763d EB |
4807 | /* If we are converting between tagged types, try to upcast properly. */ |
4808 | else if (ecode == RECORD_TYPE && code == RECORD_TYPE | |
4809 | && TYPE_ALIGN_OK (etype) && TYPE_ALIGN_OK (type)) | |
4810 | { | |
4811 | tree child_etype = etype; | |
4812 | do { | |
4813 | tree field = TYPE_FIELDS (child_etype); | |
4814 | if (DECL_NAME (field) == parent_name_id && TREE_TYPE (field) == type) | |
4815 | return build_component_ref (expr, NULL_TREE, field, false); | |
4816 | child_etype = TREE_TYPE (field); | |
4817 | } while (TREE_CODE (child_etype) == RECORD_TYPE); | |
4818 | } | |
4819 | ||
bb1f7929 EB |
4820 | /* If we are converting from a smaller form of record type back to it, just |
4821 | make a VIEW_CONVERT_EXPR. But first pad the expression to have the same | |
4822 | size on both sides. */ | |
4823 | else if (ecode == RECORD_TYPE && code == RECORD_TYPE | |
4824 | && smaller_form_type_p (etype, type)) | |
4825 | { | |
4826 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, | |
4827 | false, false, false, true), | |
4828 | expr); | |
4829 | return build1 (VIEW_CONVERT_EXPR, type, expr); | |
4830 | } | |
4831 | ||
a1ab4c31 | 4832 | /* In all other cases of related types, make a NOP_EXPR. */ |
86060344 | 4833 | else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (etype)) |
a1ab4c31 AC |
4834 | return fold_convert (type, expr); |
4835 | ||
4836 | switch (code) | |
4837 | { | |
4838 | case VOID_TYPE: | |
4839 | return fold_build1 (CONVERT_EXPR, type, expr); | |
4840 | ||
a1ab4c31 AC |
4841 | case INTEGER_TYPE: |
4842 | if (TYPE_HAS_ACTUAL_BOUNDS_P (type) | |
4843 | && (ecode == ARRAY_TYPE || ecode == UNCONSTRAINED_ARRAY_TYPE | |
4844 | || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype)))) | |
4845 | return unchecked_convert (type, expr, false); | |
4846 | else if (TYPE_BIASED_REPRESENTATION_P (type)) | |
4847 | return fold_convert (type, | |
4848 | fold_build2 (MINUS_EXPR, TREE_TYPE (type), | |
4849 | convert (TREE_TYPE (type), expr), | |
4850 | TYPE_MIN_VALUE (type))); | |
4851 | ||
4852 | /* ... fall through ... */ | |
4853 | ||
4854 | case ENUMERAL_TYPE: | |
01ddebf2 | 4855 | case BOOLEAN_TYPE: |
a1ab4c31 AC |
4856 | /* If we are converting an additive expression to an integer type |
4857 | with lower precision, be wary of the optimization that can be | |
4858 | applied by convert_to_integer. There are 2 problematic cases: | |
4859 | - if the first operand was originally of a biased type, | |
4860 | because we could be recursively called to convert it | |
4861 | to an intermediate type and thus rematerialize the | |
4862 | additive operator endlessly, | |
4863 | - if the expression contains a placeholder, because an | |
4864 | intermediate conversion that changes the sign could | |
4865 | be inserted and thus introduce an artificial overflow | |
4866 | at compile time when the placeholder is substituted. */ | |
4867 | if (code == INTEGER_TYPE | |
4868 | && ecode == INTEGER_TYPE | |
4869 | && TYPE_PRECISION (type) < TYPE_PRECISION (etype) | |
4870 | && (TREE_CODE (expr) == PLUS_EXPR || TREE_CODE (expr) == MINUS_EXPR)) | |
4871 | { | |
4872 | tree op0 = get_unwidened (TREE_OPERAND (expr, 0), type); | |
4873 | ||
4874 | if ((TREE_CODE (TREE_TYPE (op0)) == INTEGER_TYPE | |
4875 | && TYPE_BIASED_REPRESENTATION_P (TREE_TYPE (op0))) | |
4876 | || CONTAINS_PLACEHOLDER_P (expr)) | |
4877 | return build1 (NOP_EXPR, type, expr); | |
4878 | } | |
4879 | ||
4880 | return fold (convert_to_integer (type, expr)); | |
4881 | ||
4882 | case POINTER_TYPE: | |
4883 | case REFERENCE_TYPE: | |
0d7de0e1 | 4884 | /* If converting between two thin pointers, adjust if needed to account |
2b45154d EB |
4885 | for differing offsets from the base pointer, depending on whether |
4886 | there is a TYPE_UNCONSTRAINED_ARRAY attached to the record type. */ | |
315cff15 | 4887 | if (TYPE_IS_THIN_POINTER_P (etype) && TYPE_IS_THIN_POINTER_P (type)) |
a1ab4c31 | 4888 | { |
2b45154d EB |
4889 | tree etype_pos |
4890 | = TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (etype)) != NULL_TREE | |
4891 | ? byte_position (DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (etype)))) | |
4892 | : size_zero_node; | |
4893 | tree type_pos | |
4894 | = TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)) != NULL_TREE | |
4895 | ? byte_position (DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (type)))) | |
4896 | : size_zero_node; | |
4897 | tree byte_diff = size_diffop (type_pos, etype_pos); | |
0d7de0e1 | 4898 | |
a1ab4c31 | 4899 | expr = build1 (NOP_EXPR, type, expr); |
a1ab4c31 AC |
4900 | if (integer_zerop (byte_diff)) |
4901 | return expr; | |
4902 | ||
4903 | return build_binary_op (POINTER_PLUS_EXPR, type, expr, | |
0d7de0e1 | 4904 | fold_convert (sizetype, byte_diff)); |
a1ab4c31 AC |
4905 | } |
4906 | ||
0d7de0e1 EB |
4907 | /* If converting fat pointer to normal or thin pointer, get the pointer |
4908 | to the array and then convert it. */ | |
4909 | if (TYPE_IS_FAT_POINTER_P (etype)) | |
86060344 EB |
4910 | expr |
4911 | = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (etype), false); | |
a1ab4c31 AC |
4912 | |
4913 | return fold (convert_to_pointer (type, expr)); | |
4914 | ||
4915 | case REAL_TYPE: | |
4916 | return fold (convert_to_real (type, expr)); | |
4917 | ||
4918 | case RECORD_TYPE: | |
4919 | if (TYPE_JUSTIFIED_MODULAR_P (type) && !AGGREGATE_TYPE_P (etype)) | |
0e228dd9 | 4920 | { |
9771b263 DN |
4921 | vec<constructor_elt, va_gc> *v; |
4922 | vec_alloc (v, 1); | |
0e228dd9 NF |
4923 | |
4924 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), | |
4925 | convert (TREE_TYPE (TYPE_FIELDS (type)), | |
4926 | expr)); | |
4927 | return gnat_build_constructor (type, v); | |
4928 | } | |
a1ab4c31 AC |
4929 | |
4930 | /* ... fall through ... */ | |
4931 | ||
4932 | case ARRAY_TYPE: | |
4933 | /* In these cases, assume the front-end has validated the conversion. | |
4934 | If the conversion is valid, it will be a bit-wise conversion, so | |
4935 | it can be viewed as an unchecked conversion. */ | |
4936 | return unchecked_convert (type, expr, false); | |
4937 | ||
4938 | case UNION_TYPE: | |
4939 | /* This is a either a conversion between a tagged type and some | |
4940 | subtype, which we have to mark as a UNION_TYPE because of | |
4941 | overlapping fields or a conversion of an Unchecked_Union. */ | |
4942 | return unchecked_convert (type, expr, false); | |
4943 | ||
4944 | case UNCONSTRAINED_ARRAY_TYPE: | |
7948ae37 OH |
4945 | /* If the input is a VECTOR_TYPE, convert to the representative |
4946 | array type first. */ | |
4947 | if (ecode == VECTOR_TYPE) | |
4948 | { | |
4949 | expr = convert (TYPE_REPRESENTATIVE_ARRAY (etype), expr); | |
4950 | etype = TREE_TYPE (expr); | |
4951 | ecode = TREE_CODE (etype); | |
4952 | } | |
4953 | ||
a1ab4c31 AC |
4954 | /* If EXPR is a constrained array, take its address, convert it to a |
4955 | fat pointer, and then dereference it. Likewise if EXPR is a | |
4956 | record containing both a template and a constrained array. | |
4957 | Note that a record representing a justified modular type | |
4958 | always represents a packed constrained array. */ | |
4959 | if (ecode == ARRAY_TYPE | |
4960 | || (ecode == INTEGER_TYPE && TYPE_HAS_ACTUAL_BOUNDS_P (etype)) | |
4961 | || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype)) | |
4962 | || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype))) | |
4963 | return | |
4964 | build_unary_op | |
4965 | (INDIRECT_REF, NULL_TREE, | |
4966 | convert_to_fat_pointer (TREE_TYPE (type), | |
4967 | build_unary_op (ADDR_EXPR, | |
4968 | NULL_TREE, expr))); | |
4969 | ||
4970 | /* Do something very similar for converting one unconstrained | |
4971 | array to another. */ | |
4972 | else if (ecode == UNCONSTRAINED_ARRAY_TYPE) | |
4973 | return | |
4974 | build_unary_op (INDIRECT_REF, NULL_TREE, | |
4975 | convert (TREE_TYPE (type), | |
4976 | build_unary_op (ADDR_EXPR, | |
4977 | NULL_TREE, expr))); | |
4978 | else | |
4979 | gcc_unreachable (); | |
4980 | ||
4981 | case COMPLEX_TYPE: | |
4982 | return fold (convert_to_complex (type, expr)); | |
4983 | ||
4984 | default: | |
4985 | gcc_unreachable (); | |
4986 | } | |
4987 | } | |
15bf7d19 EB |
4988 | |
4989 | /* Create an expression whose value is that of EXPR converted to the common | |
4990 | index type, which is sizetype. EXPR is supposed to be in the base type | |
4991 | of the GNAT index type. Calling it is equivalent to doing | |
4992 | ||
4993 | convert (sizetype, expr) | |
4994 | ||
4995 | but we try to distribute the type conversion with the knowledge that EXPR | |
4996 | cannot overflow in its type. This is a best-effort approach and we fall | |
4997 | back to the above expression as soon as difficulties are encountered. | |
4998 | ||
4999 | This is necessary to overcome issues that arise when the GNAT base index | |
5000 | type and the GCC common index type (sizetype) don't have the same size, | |
5001 | which is quite frequent on 64-bit architectures. In this case, and if | |
5002 | the GNAT base index type is signed but the iteration type of the loop has | |
5003 | been forced to unsigned, the loop scalar evolution engine cannot compute | |
5004 | a simple evolution for the general induction variables associated with the | |
5005 | array indices, because it will preserve the wrap-around semantics in the | |
5006 | unsigned type of their "inner" part. As a result, many loop optimizations | |
5007 | are blocked. | |
5008 | ||
5009 | The solution is to use a special (basic) induction variable that is at | |
5010 | least as large as sizetype, and to express the aforementioned general | |
5011 | induction variables in terms of this induction variable, eliminating | |
5012 | the problematic intermediate truncation to the GNAT base index type. | |
5013 | This is possible as long as the original expression doesn't overflow | |
5014 | and if the middle-end hasn't introduced artificial overflows in the | |
5015 | course of the various simplification it can make to the expression. */ | |
5016 | ||
5017 | tree | |
5018 | convert_to_index_type (tree expr) | |
5019 | { | |
5020 | enum tree_code code = TREE_CODE (expr); | |
5021 | tree type = TREE_TYPE (expr); | |
5022 | ||
5023 | /* If the type is unsigned, overflow is allowed so we cannot be sure that | |
5024 | EXPR doesn't overflow. Keep it simple if optimization is disabled. */ | |
5025 | if (TYPE_UNSIGNED (type) || !optimize) | |
5026 | return convert (sizetype, expr); | |
5027 | ||
5028 | switch (code) | |
5029 | { | |
5030 | case VAR_DECL: | |
5031 | /* The main effect of the function: replace a loop parameter with its | |
5032 | associated special induction variable. */ | |
5033 | if (DECL_LOOP_PARM_P (expr) && DECL_INDUCTION_VAR (expr)) | |
5034 | expr = DECL_INDUCTION_VAR (expr); | |
5035 | break; | |
5036 | ||
5037 | CASE_CONVERT: | |
5038 | { | |
5039 | tree otype = TREE_TYPE (TREE_OPERAND (expr, 0)); | |
5040 | /* Bail out as soon as we suspect some sort of type frobbing. */ | |
5041 | if (TYPE_PRECISION (type) != TYPE_PRECISION (otype) | |
5042 | || TYPE_UNSIGNED (type) != TYPE_UNSIGNED (otype)) | |
5043 | break; | |
5044 | } | |
5045 | ||
5046 | /* ... fall through ... */ | |
5047 | ||
5048 | case NON_LVALUE_EXPR: | |
5049 | return fold_build1 (code, sizetype, | |
5050 | convert_to_index_type (TREE_OPERAND (expr, 0))); | |
5051 | ||
5052 | case PLUS_EXPR: | |
5053 | case MINUS_EXPR: | |
5054 | case MULT_EXPR: | |
5055 | return fold_build2 (code, sizetype, | |
5056 | convert_to_index_type (TREE_OPERAND (expr, 0)), | |
5057 | convert_to_index_type (TREE_OPERAND (expr, 1))); | |
5058 | ||
5059 | case COMPOUND_EXPR: | |
5060 | return fold_build2 (code, sizetype, TREE_OPERAND (expr, 0), | |
5061 | convert_to_index_type (TREE_OPERAND (expr, 1))); | |
5062 | ||
5063 | case COND_EXPR: | |
5064 | return fold_build3 (code, sizetype, TREE_OPERAND (expr, 0), | |
5065 | convert_to_index_type (TREE_OPERAND (expr, 1)), | |
5066 | convert_to_index_type (TREE_OPERAND (expr, 2))); | |
5067 | ||
5068 | default: | |
5069 | break; | |
5070 | } | |
5071 | ||
5072 | return convert (sizetype, expr); | |
5073 | } | |
a1ab4c31 AC |
5074 | \f |
5075 | /* Remove all conversions that are done in EXP. This includes converting | |
5076 | from a padded type or to a justified modular type. If TRUE_ADDRESS | |
5077 | is true, always return the address of the containing object even if | |
5078 | the address is not bit-aligned. */ | |
5079 | ||
5080 | tree | |
5081 | remove_conversions (tree exp, bool true_address) | |
5082 | { | |
5083 | switch (TREE_CODE (exp)) | |
5084 | { | |
5085 | case CONSTRUCTOR: | |
5086 | if (true_address | |
5087 | && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
5088 | && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (exp))) | |
5089 | return | |
9771b263 | 5090 | remove_conversions ((*CONSTRUCTOR_ELTS (exp))[0].value, true); |
a1ab4c31 AC |
5091 | break; |
5092 | ||
5093 | case COMPONENT_REF: | |
315cff15 | 5094 | if (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
a1ab4c31 AC |
5095 | return remove_conversions (TREE_OPERAND (exp, 0), true_address); |
5096 | break; | |
5097 | ||
a1ab4c31 | 5098 | CASE_CONVERT: |
722356ce EB |
5099 | case VIEW_CONVERT_EXPR: |
5100 | case NON_LVALUE_EXPR: | |
a1ab4c31 AC |
5101 | return remove_conversions (TREE_OPERAND (exp, 0), true_address); |
5102 | ||
5103 | default: | |
5104 | break; | |
5105 | } | |
5106 | ||
5107 | return exp; | |
5108 | } | |
5109 | \f | |
5110 | /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that | |
86060344 | 5111 | refers to the underlying array. If it has TYPE_CONTAINS_TEMPLATE_P, |
a1ab4c31 AC |
5112 | likewise return an expression pointing to the underlying array. */ |
5113 | ||
5114 | tree | |
5115 | maybe_unconstrained_array (tree exp) | |
5116 | { | |
5117 | enum tree_code code = TREE_CODE (exp); | |
1aa291f7 | 5118 | tree type = TREE_TYPE (exp); |
a1ab4c31 | 5119 | |
1aa291f7 | 5120 | switch (TREE_CODE (type)) |
a1ab4c31 AC |
5121 | { |
5122 | case UNCONSTRAINED_ARRAY_TYPE: | |
5123 | if (code == UNCONSTRAINED_ARRAY_REF) | |
5124 | { | |
7e169899 | 5125 | const bool read_only = TREE_READONLY (exp); |
a1c7d797 EB |
5126 | const bool no_trap = TREE_THIS_NOTRAP (exp); |
5127 | ||
7e169899 | 5128 | exp = TREE_OPERAND (exp, 0); |
1aa291f7 EB |
5129 | type = TREE_TYPE (exp); |
5130 | ||
7e169899 EB |
5131 | if (TREE_CODE (exp) == COND_EXPR) |
5132 | { | |
5133 | tree op1 | |
5134 | = build_unary_op (INDIRECT_REF, NULL_TREE, | |
5135 | build_component_ref (TREE_OPERAND (exp, 1), | |
5136 | NULL_TREE, | |
1aa291f7 | 5137 | TYPE_FIELDS (type), |
7e169899 EB |
5138 | false)); |
5139 | tree op2 | |
5140 | = build_unary_op (INDIRECT_REF, NULL_TREE, | |
5141 | build_component_ref (TREE_OPERAND (exp, 2), | |
5142 | NULL_TREE, | |
1aa291f7 | 5143 | TYPE_FIELDS (type), |
7e169899 EB |
5144 | false)); |
5145 | ||
5146 | exp = build3 (COND_EXPR, | |
1aa291f7 | 5147 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS (type))), |
7e169899 EB |
5148 | TREE_OPERAND (exp, 0), op1, op2); |
5149 | } | |
5150 | else | |
a1c7d797 EB |
5151 | { |
5152 | exp = build_unary_op (INDIRECT_REF, NULL_TREE, | |
5153 | build_component_ref (exp, NULL_TREE, | |
1aa291f7 | 5154 | TYPE_FIELDS (type), |
a1c7d797 EB |
5155 | false)); |
5156 | TREE_READONLY (exp) = read_only; | |
5157 | TREE_THIS_NOTRAP (exp) = no_trap; | |
5158 | } | |
a1ab4c31 AC |
5159 | } |
5160 | ||
5161 | else if (code == NULL_EXPR) | |
1aa291f7 EB |
5162 | exp = build1 (NULL_EXPR, |
5163 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))), | |
5164 | TREE_OPERAND (exp, 0)); | |
5165 | break; | |
a1ab4c31 AC |
5166 | |
5167 | case RECORD_TYPE: | |
1aa291f7 EB |
5168 | /* If this is a padded type and it contains a template, convert to the |
5169 | unpadded type first. */ | |
5170 | if (TYPE_PADDING_P (type) | |
5171 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == RECORD_TYPE | |
5172 | && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (TYPE_FIELDS (type)))) | |
a1ab4c31 | 5173 | { |
1aa291f7 EB |
5174 | exp = convert (TREE_TYPE (TYPE_FIELDS (type)), exp); |
5175 | type = TREE_TYPE (exp); | |
5176 | } | |
5177 | ||
5178 | if (TYPE_CONTAINS_TEMPLATE_P (type)) | |
5179 | { | |
5180 | exp = build_component_ref (exp, NULL_TREE, | |
5181 | DECL_CHAIN (TYPE_FIELDS (type)), | |
5182 | false); | |
5183 | type = TREE_TYPE (exp); | |
5184 | ||
5185 | /* If the array type is padded, convert to the unpadded type. */ | |
5186 | if (TYPE_IS_PADDING_P (type)) | |
5187 | exp = convert (TREE_TYPE (TYPE_FIELDS (type)), exp); | |
a1ab4c31 | 5188 | } |
a1ab4c31 AC |
5189 | break; |
5190 | ||
5191 | default: | |
5192 | break; | |
5193 | } | |
5194 | ||
5195 | return exp; | |
5196 | } | |
5197 | \f | |
afcea859 | 5198 | /* Return true if EXPR is an expression that can be folded as an operand |
84fb43a1 | 5199 | of a VIEW_CONVERT_EXPR. See ada-tree.h for a complete rationale. */ |
afcea859 EB |
5200 | |
5201 | static bool | |
5202 | can_fold_for_view_convert_p (tree expr) | |
5203 | { | |
5204 | tree t1, t2; | |
5205 | ||
5206 | /* The folder will fold NOP_EXPRs between integral types with the same | |
5207 | precision (in the middle-end's sense). We cannot allow it if the | |
5208 | types don't have the same precision in the Ada sense as well. */ | |
5209 | if (TREE_CODE (expr) != NOP_EXPR) | |
5210 | return true; | |
5211 | ||
5212 | t1 = TREE_TYPE (expr); | |
5213 | t2 = TREE_TYPE (TREE_OPERAND (expr, 0)); | |
5214 | ||
5215 | /* Defer to the folder for non-integral conversions. */ | |
5216 | if (!(INTEGRAL_TYPE_P (t1) && INTEGRAL_TYPE_P (t2))) | |
5217 | return true; | |
5218 | ||
5219 | /* Only fold conversions that preserve both precisions. */ | |
5220 | if (TYPE_PRECISION (t1) == TYPE_PRECISION (t2) | |
5221 | && operand_equal_p (rm_size (t1), rm_size (t2), 0)) | |
5222 | return true; | |
5223 | ||
5224 | return false; | |
5225 | } | |
5226 | ||
a1ab4c31 | 5227 | /* Return an expression that does an unchecked conversion of EXPR to TYPE. |
afcea859 EB |
5228 | If NOTRUNC_P is true, truncation operations should be suppressed. |
5229 | ||
5230 | Special care is required with (source or target) integral types whose | |
5231 | precision is not equal to their size, to make sure we fetch or assign | |
5232 | the value bits whose location might depend on the endianness, e.g. | |
5233 | ||
5234 | Rmsize : constant := 8; | |
5235 | subtype Int is Integer range 0 .. 2 ** Rmsize - 1; | |
5236 | ||
5237 | type Bit_Array is array (1 .. Rmsize) of Boolean; | |
5238 | pragma Pack (Bit_Array); | |
5239 | ||
5240 | function To_Bit_Array is new Unchecked_Conversion (Int, Bit_Array); | |
5241 | ||
5242 | Value : Int := 2#1000_0001#; | |
5243 | Vbits : Bit_Array := To_Bit_Array (Value); | |
5244 | ||
5245 | we expect the 8 bits at Vbits'Address to always contain Value, while | |
5246 | their original location depends on the endianness, at Value'Address | |
84fb43a1 | 5247 | on a little-endian architecture but not on a big-endian one. */ |
a1ab4c31 AC |
5248 | |
5249 | tree | |
5250 | unchecked_convert (tree type, tree expr, bool notrunc_p) | |
5251 | { | |
5252 | tree etype = TREE_TYPE (expr); | |
c34f3839 EB |
5253 | enum tree_code ecode = TREE_CODE (etype); |
5254 | enum tree_code code = TREE_CODE (type); | |
980a0501 | 5255 | int c; |
a1ab4c31 | 5256 | |
c34f3839 | 5257 | /* If the expression is already of the right type, we are done. */ |
a1ab4c31 AC |
5258 | if (etype == type) |
5259 | return expr; | |
5260 | ||
5261 | /* If both types types are integral just do a normal conversion. | |
5262 | Likewise for a conversion to an unconstrained array. */ | |
5263 | if ((((INTEGRAL_TYPE_P (type) | |
c34f3839 | 5264 | && !(code == INTEGER_TYPE && TYPE_VAX_FLOATING_POINT_P (type))) |
0d7de0e1 | 5265 | || (POINTER_TYPE_P (type) && !TYPE_IS_THIN_POINTER_P (type)) |
c34f3839 | 5266 | || (code == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (type))) |
a1ab4c31 | 5267 | && ((INTEGRAL_TYPE_P (etype) |
c34f3839 | 5268 | && !(ecode == INTEGER_TYPE && TYPE_VAX_FLOATING_POINT_P (etype))) |
315cff15 | 5269 | || (POINTER_TYPE_P (etype) && !TYPE_IS_THIN_POINTER_P (etype)) |
c34f3839 EB |
5270 | || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype)))) |
5271 | || code == UNCONSTRAINED_ARRAY_TYPE) | |
a1ab4c31 | 5272 | { |
c34f3839 | 5273 | if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype)) |
a1ab4c31 AC |
5274 | { |
5275 | tree ntype = copy_type (etype); | |
a1ab4c31 AC |
5276 | TYPE_BIASED_REPRESENTATION_P (ntype) = 0; |
5277 | TYPE_MAIN_VARIANT (ntype) = ntype; | |
5278 | expr = build1 (NOP_EXPR, ntype, expr); | |
5279 | } | |
5280 | ||
c34f3839 | 5281 | if (code == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (type)) |
a1ab4c31 | 5282 | { |
afcea859 | 5283 | tree rtype = copy_type (type); |
a1ab4c31 AC |
5284 | TYPE_BIASED_REPRESENTATION_P (rtype) = 0; |
5285 | TYPE_MAIN_VARIANT (rtype) = rtype; | |
afcea859 EB |
5286 | expr = convert (rtype, expr); |
5287 | expr = build1 (NOP_EXPR, type, expr); | |
a1ab4c31 | 5288 | } |
afcea859 EB |
5289 | else |
5290 | expr = convert (type, expr); | |
a1ab4c31 AC |
5291 | } |
5292 | ||
afcea859 | 5293 | /* If we are converting to an integral type whose precision is not equal |
416de7d5 EB |
5294 | to its size, first unchecked convert to a record type that contains an |
5295 | field of the given precision. Then extract the field. */ | |
980a0501 EB |
5296 | else if (INTEGRAL_TYPE_P (type) |
5297 | && TYPE_RM_SIZE (type) | |
a1ab4c31 AC |
5298 | && 0 != compare_tree_int (TYPE_RM_SIZE (type), |
5299 | GET_MODE_BITSIZE (TYPE_MODE (type)))) | |
5300 | { | |
5301 | tree rec_type = make_node (RECORD_TYPE); | |
416de7d5 EB |
5302 | unsigned HOST_WIDE_INT prec = TREE_INT_CST_LOW (TYPE_RM_SIZE (type)); |
5303 | tree field_type, field; | |
5304 | ||
5305 | if (TYPE_UNSIGNED (type)) | |
5306 | field_type = make_unsigned_type (prec); | |
5307 | else | |
5308 | field_type = make_signed_type (prec); | |
5309 | SET_TYPE_RM_SIZE (field_type, TYPE_RM_SIZE (type)); | |
5310 | ||
5311 | field = create_field_decl (get_identifier ("OBJ"), field_type, rec_type, | |
5312 | NULL_TREE, NULL_TREE, 1, 0); | |
a1ab4c31 AC |
5313 | |
5314 | TYPE_FIELDS (rec_type) = field; | |
5315 | layout_type (rec_type); | |
5316 | ||
5317 | expr = unchecked_convert (rec_type, expr, notrunc_p); | |
3cd64bab | 5318 | expr = build_component_ref (expr, NULL_TREE, field, false); |
416de7d5 | 5319 | expr = fold_build1 (NOP_EXPR, type, expr); |
a1ab4c31 AC |
5320 | } |
5321 | ||
416de7d5 EB |
5322 | /* Similarly if we are converting from an integral type whose precision is |
5323 | not equal to its size, first copy into a field of the given precision | |
5324 | and unchecked convert the record type. */ | |
980a0501 EB |
5325 | else if (INTEGRAL_TYPE_P (etype) |
5326 | && TYPE_RM_SIZE (etype) | |
5327 | && 0 != compare_tree_int (TYPE_RM_SIZE (etype), | |
5328 | GET_MODE_BITSIZE (TYPE_MODE (etype)))) | |
a1ab4c31 AC |
5329 | { |
5330 | tree rec_type = make_node (RECORD_TYPE); | |
416de7d5 | 5331 | unsigned HOST_WIDE_INT prec = TREE_INT_CST_LOW (TYPE_RM_SIZE (etype)); |
9771b263 DN |
5332 | vec<constructor_elt, va_gc> *v; |
5333 | vec_alloc (v, 1); | |
416de7d5 EB |
5334 | tree field_type, field; |
5335 | ||
5336 | if (TYPE_UNSIGNED (etype)) | |
5337 | field_type = make_unsigned_type (prec); | |
5338 | else | |
5339 | field_type = make_signed_type (prec); | |
5340 | SET_TYPE_RM_SIZE (field_type, TYPE_RM_SIZE (etype)); | |
5341 | ||
5342 | field = create_field_decl (get_identifier ("OBJ"), field_type, rec_type, | |
5343 | NULL_TREE, NULL_TREE, 1, 0); | |
a1ab4c31 AC |
5344 | |
5345 | TYPE_FIELDS (rec_type) = field; | |
5346 | layout_type (rec_type); | |
5347 | ||
416de7d5 | 5348 | expr = fold_build1 (NOP_EXPR, field_type, expr); |
0e228dd9 NF |
5349 | CONSTRUCTOR_APPEND_ELT (v, field, expr); |
5350 | expr = gnat_build_constructor (rec_type, v); | |
a1ab4c31 AC |
5351 | expr = unchecked_convert (type, expr, notrunc_p); |
5352 | } | |
5353 | ||
980a0501 EB |
5354 | /* If we are converting from a scalar type to a type with a different size, |
5355 | we need to pad to have the same size on both sides. | |
5356 | ||
5357 | ??? We cannot do it unconditionally because unchecked conversions are | |
5358 | used liberally by the front-end to implement polymorphism, e.g. in: | |
5359 | ||
5360 | S191s : constant ada__tags__addr_ptr := ada__tags__addr_ptr!(S190s); | |
5361 | return p___size__4 (p__object!(S191s.all)); | |
5362 | ||
5363 | so we skip all expressions that are references. */ | |
5364 | else if (!REFERENCE_CLASS_P (expr) | |
5365 | && !AGGREGATE_TYPE_P (etype) | |
5366 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST | |
5367 | && (c = tree_int_cst_compare (TYPE_SIZE (etype), TYPE_SIZE (type)))) | |
5368 | { | |
5369 | if (c < 0) | |
5370 | { | |
5371 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, | |
5372 | false, false, false, true), | |
5373 | expr); | |
5374 | expr = unchecked_convert (type, expr, notrunc_p); | |
5375 | } | |
5376 | else | |
5377 | { | |
5378 | tree rec_type = maybe_pad_type (type, TYPE_SIZE (etype), 0, Empty, | |
5379 | false, false, false, true); | |
5380 | expr = unchecked_convert (rec_type, expr, notrunc_p); | |
5381 | expr = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (rec_type), | |
5382 | false); | |
5383 | } | |
5384 | } | |
5385 | ||
7948ae37 OH |
5386 | /* We have a special case when we are converting between two unconstrained |
5387 | array types. In that case, take the address, convert the fat pointer | |
5388 | types, and dereference. */ | |
c34f3839 | 5389 | else if (ecode == code && code == UNCONSTRAINED_ARRAY_TYPE) |
a1ab4c31 AC |
5390 | expr = build_unary_op (INDIRECT_REF, NULL_TREE, |
5391 | build1 (VIEW_CONVERT_EXPR, TREE_TYPE (type), | |
5392 | build_unary_op (ADDR_EXPR, NULL_TREE, | |
5393 | expr))); | |
7948ae37 OH |
5394 | |
5395 | /* Another special case is when we are converting to a vector type from its | |
5396 | representative array type; this a regular conversion. */ | |
c34f3839 EB |
5397 | else if (code == VECTOR_TYPE |
5398 | && ecode == ARRAY_TYPE | |
7948ae37 OH |
5399 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), |
5400 | etype)) | |
5401 | expr = convert (type, expr); | |
5402 | ||
a1ab4c31 AC |
5403 | else |
5404 | { | |
5405 | expr = maybe_unconstrained_array (expr); | |
5406 | etype = TREE_TYPE (expr); | |
c34f3839 | 5407 | ecode = TREE_CODE (etype); |
afcea859 EB |
5408 | if (can_fold_for_view_convert_p (expr)) |
5409 | expr = fold_build1 (VIEW_CONVERT_EXPR, type, expr); | |
5410 | else | |
5411 | expr = build1 (VIEW_CONVERT_EXPR, type, expr); | |
a1ab4c31 AC |
5412 | } |
5413 | ||
afcea859 EB |
5414 | /* If the result is an integral type whose precision is not equal to its |
5415 | size, sign- or zero-extend the result. We need not do this if the input | |
5416 | is an integral type of the same precision and signedness or if the output | |
a1ab4c31 AC |
5417 | is a biased type or if both the input and output are unsigned. */ |
5418 | if (!notrunc_p | |
5419 | && INTEGRAL_TYPE_P (type) && TYPE_RM_SIZE (type) | |
c34f3839 | 5420 | && !(code == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (type)) |
a1ab4c31 AC |
5421 | && 0 != compare_tree_int (TYPE_RM_SIZE (type), |
5422 | GET_MODE_BITSIZE (TYPE_MODE (type))) | |
5423 | && !(INTEGRAL_TYPE_P (etype) | |
5424 | && TYPE_UNSIGNED (type) == TYPE_UNSIGNED (etype) | |
5425 | && operand_equal_p (TYPE_RM_SIZE (type), | |
5426 | (TYPE_RM_SIZE (etype) != 0 | |
5427 | ? TYPE_RM_SIZE (etype) : TYPE_SIZE (etype)), | |
5428 | 0)) | |
5429 | && !(TYPE_UNSIGNED (type) && TYPE_UNSIGNED (etype))) | |
5430 | { | |
c34f3839 EB |
5431 | tree base_type |
5432 | = gnat_type_for_mode (TYPE_MODE (type), TYPE_UNSIGNED (type)); | |
a1ab4c31 AC |
5433 | tree shift_expr |
5434 | = convert (base_type, | |
5435 | size_binop (MINUS_EXPR, | |
5436 | bitsize_int | |
5437 | (GET_MODE_BITSIZE (TYPE_MODE (type))), | |
5438 | TYPE_RM_SIZE (type))); | |
5439 | expr | |
5440 | = convert (type, | |
5441 | build_binary_op (RSHIFT_EXPR, base_type, | |
5442 | build_binary_op (LSHIFT_EXPR, base_type, | |
5443 | convert (base_type, expr), | |
5444 | shift_expr), | |
5445 | shift_expr)); | |
5446 | } | |
5447 | ||
5448 | /* An unchecked conversion should never raise Constraint_Error. The code | |
5449 | below assumes that GCC's conversion routines overflow the same way that | |
5450 | the underlying hardware does. This is probably true. In the rare case | |
5451 | when it is false, we can rely on the fact that such conversions are | |
5452 | erroneous anyway. */ | |
5453 | if (TREE_CODE (expr) == INTEGER_CST) | |
5454 | TREE_OVERFLOW (expr) = 0; | |
5455 | ||
5456 | /* If the sizes of the types differ and this is an VIEW_CONVERT_EXPR, | |
5457 | show no longer constant. */ | |
5458 | if (TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
5459 | && !operand_equal_p (TYPE_SIZE_UNIT (type), TYPE_SIZE_UNIT (etype), | |
5460 | OEP_ONLY_CONST)) | |
5461 | TREE_CONSTANT (expr) = 0; | |
5462 | ||
5463 | return expr; | |
5464 | } | |
5465 | \f | |
feec4372 | 5466 | /* Return the appropriate GCC tree code for the specified GNAT_TYPE, |
a1ab4c31 AC |
5467 | the latter being a record type as predicated by Is_Record_Type. */ |
5468 | ||
5469 | enum tree_code | |
5470 | tree_code_for_record_type (Entity_Id gnat_type) | |
5471 | { | |
b1a785fb | 5472 | Node_Id component_list, component; |
a1ab4c31 | 5473 | |
b1a785fb EB |
5474 | /* Return UNION_TYPE if it's an Unchecked_Union whose non-discriminant |
5475 | fields are all in the variant part. Otherwise, return RECORD_TYPE. */ | |
a1ab4c31 AC |
5476 | if (!Is_Unchecked_Union (gnat_type)) |
5477 | return RECORD_TYPE; | |
5478 | ||
b1a785fb EB |
5479 | gnat_type = Implementation_Base_Type (gnat_type); |
5480 | component_list | |
5481 | = Component_List (Type_Definition (Declaration_Node (gnat_type))); | |
5482 | ||
a1ab4c31 AC |
5483 | for (component = First_Non_Pragma (Component_Items (component_list)); |
5484 | Present (component); | |
5485 | component = Next_Non_Pragma (component)) | |
5486 | if (Ekind (Defining_Entity (component)) == E_Component) | |
5487 | return RECORD_TYPE; | |
5488 | ||
5489 | return UNION_TYPE; | |
5490 | } | |
5491 | ||
caa9d12a EB |
5492 | /* Return true if GNAT_TYPE is a "double" floating-point type, i.e. whose |
5493 | size is equal to 64 bits, or an array of such a type. Set ALIGN_CLAUSE | |
5494 | according to the presence of an alignment clause on the type or, if it | |
5495 | is an array, on the component type. */ | |
5496 | ||
5497 | bool | |
5498 | is_double_float_or_array (Entity_Id gnat_type, bool *align_clause) | |
5499 | { | |
5500 | gnat_type = Underlying_Type (gnat_type); | |
5501 | ||
5502 | *align_clause = Present (Alignment_Clause (gnat_type)); | |
5503 | ||
5504 | if (Is_Array_Type (gnat_type)) | |
5505 | { | |
5506 | gnat_type = Underlying_Type (Component_Type (gnat_type)); | |
5507 | if (Present (Alignment_Clause (gnat_type))) | |
5508 | *align_clause = true; | |
5509 | } | |
5510 | ||
5511 | if (!Is_Floating_Point_Type (gnat_type)) | |
5512 | return false; | |
5513 | ||
5514 | if (UI_To_Int (Esize (gnat_type)) != 64) | |
5515 | return false; | |
5516 | ||
5517 | return true; | |
5518 | } | |
5519 | ||
5520 | /* Return true if GNAT_TYPE is a "double" or larger scalar type, i.e. whose | |
5521 | size is greater or equal to 64 bits, or an array of such a type. Set | |
5522 | ALIGN_CLAUSE according to the presence of an alignment clause on the | |
5523 | type or, if it is an array, on the component type. */ | |
5524 | ||
5525 | bool | |
5526 | is_double_scalar_or_array (Entity_Id gnat_type, bool *align_clause) | |
5527 | { | |
5528 | gnat_type = Underlying_Type (gnat_type); | |
5529 | ||
5530 | *align_clause = Present (Alignment_Clause (gnat_type)); | |
5531 | ||
5532 | if (Is_Array_Type (gnat_type)) | |
5533 | { | |
5534 | gnat_type = Underlying_Type (Component_Type (gnat_type)); | |
5535 | if (Present (Alignment_Clause (gnat_type))) | |
5536 | *align_clause = true; | |
5537 | } | |
5538 | ||
5539 | if (!Is_Scalar_Type (gnat_type)) | |
5540 | return false; | |
5541 | ||
5542 | if (UI_To_Int (Esize (gnat_type)) < 64) | |
5543 | return false; | |
5544 | ||
5545 | return true; | |
5546 | } | |
5547 | ||
a1ab4c31 AC |
5548 | /* Return true if GNU_TYPE is suitable as the type of a non-aliased |
5549 | component of an aggregate type. */ | |
5550 | ||
5551 | bool | |
5552 | type_for_nonaliased_component_p (tree gnu_type) | |
5553 | { | |
5554 | /* If the type is passed by reference, we may have pointers to the | |
5555 | component so it cannot be made non-aliased. */ | |
5556 | if (must_pass_by_ref (gnu_type) || default_pass_by_ref (gnu_type)) | |
5557 | return false; | |
5558 | ||
5559 | /* We used to say that any component of aggregate type is aliased | |
5560 | because the front-end may take 'Reference of it. The front-end | |
5561 | has been enhanced in the meantime so as to use a renaming instead | |
5562 | in most cases, but the back-end can probably take the address of | |
5563 | such a component too so we go for the conservative stance. | |
5564 | ||
5565 | For instance, we might need the address of any array type, even | |
5566 | if normally passed by copy, to construct a fat pointer if the | |
5567 | component is used as an actual for an unconstrained formal. | |
5568 | ||
5569 | Likewise for record types: even if a specific record subtype is | |
5570 | passed by copy, the parent type might be passed by ref (e.g. if | |
5571 | it's of variable size) and we might take the address of a child | |
5572 | component to pass to a parent formal. We have no way to check | |
5573 | for such conditions here. */ | |
5574 | if (AGGREGATE_TYPE_P (gnu_type)) | |
5575 | return false; | |
5576 | ||
5577 | return true; | |
5578 | } | |
5579 | ||
bb1f7929 EB |
5580 | /* Return true if TYPE is a smaller form of ORIG_TYPE. */ |
5581 | ||
5582 | bool | |
5583 | smaller_form_type_p (tree type, tree orig_type) | |
5584 | { | |
5585 | tree size, osize; | |
5586 | ||
5587 | /* We're not interested in variants here. */ | |
5588 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (orig_type)) | |
5589 | return false; | |
5590 | ||
5591 | /* Like a variant, a packable version keeps the original TYPE_NAME. */ | |
5592 | if (TYPE_NAME (type) != TYPE_NAME (orig_type)) | |
5593 | return false; | |
5594 | ||
5595 | size = TYPE_SIZE (type); | |
5596 | osize = TYPE_SIZE (orig_type); | |
5597 | ||
5598 | if (!(TREE_CODE (size) == INTEGER_CST && TREE_CODE (osize) == INTEGER_CST)) | |
5599 | return false; | |
5600 | ||
5601 | return tree_int_cst_lt (size, osize) != 0; | |
5602 | } | |
5603 | ||
a1ab4c31 AC |
5604 | /* Perform final processing on global variables. */ |
5605 | ||
65444786 EB |
5606 | static GTY (()) tree dummy_global; |
5607 | ||
a1ab4c31 AC |
5608 | void |
5609 | gnat_write_global_declarations (void) | |
5610 | { | |
10e4d056 EB |
5611 | unsigned int i; |
5612 | tree iter; | |
5613 | ||
65444786 EB |
5614 | /* If we have declared types as used at the global level, insert them in |
5615 | the global hash table. We use a dummy variable for this purpose. */ | |
9771b263 | 5616 | if (types_used_by_cur_var_decl && !types_used_by_cur_var_decl->is_empty ()) |
65444786 | 5617 | { |
35e8bcf4 | 5618 | struct varpool_node *node; |
d3c268ab EB |
5619 | char *label; |
5620 | ||
5621 | ASM_FORMAT_PRIVATE_NAME (label, first_global_object_name, 0); | |
65444786 | 5622 | dummy_global |
d3c268ab EB |
5623 | = build_decl (BUILTINS_LOCATION, VAR_DECL, get_identifier (label), |
5624 | void_type_node); | |
65444786 EB |
5625 | TREE_STATIC (dummy_global) = 1; |
5626 | TREE_ASM_WRITTEN (dummy_global) = 1; | |
5d59b5e1 | 5627 | node = varpool_node_for_decl (dummy_global); |
ead84f73 | 5628 | node->symbol.force_output = 1; |
65444786 | 5629 | |
9771b263 | 5630 | while (!types_used_by_cur_var_decl->is_empty ()) |
65444786 | 5631 | { |
9771b263 | 5632 | tree t = types_used_by_cur_var_decl->pop (); |
65444786 EB |
5633 | types_used_by_var_decl_insert (t, dummy_global); |
5634 | } | |
5635 | } | |
5636 | ||
10e4d056 EB |
5637 | /* Output debug information for all global type declarations first. This |
5638 | ensures that global types whose compilation hasn't been finalized yet, | |
5639 | for example pointers to Taft amendment types, have their compilation | |
5640 | finalized in the right context. */ | |
9771b263 | 5641 | FOR_EACH_VEC_SAFE_ELT (global_decls, i, iter) |
10e4d056 EB |
5642 | if (TREE_CODE (iter) == TYPE_DECL) |
5643 | debug_hooks->global_decl (iter); | |
5644 | ||
65d630d4 JH |
5645 | /* Proceed to optimize and emit assembly. */ |
5646 | finalize_compilation_unit (); | |
a1ab4c31 | 5647 | |
10e4d056 EB |
5648 | /* After cgraph has had a chance to emit everything that's going to |
5649 | be emitted, output debug information for the rest of globals. */ | |
5650 | if (!seen_error ()) | |
5651 | { | |
5652 | timevar_push (TV_SYMOUT); | |
9771b263 | 5653 | FOR_EACH_VEC_SAFE_ELT (global_decls, i, iter) |
10e4d056 EB |
5654 | if (TREE_CODE (iter) != TYPE_DECL) |
5655 | debug_hooks->global_decl (iter); | |
5656 | timevar_pop (TV_SYMOUT); | |
5657 | } | |
a1ab4c31 AC |
5658 | } |
5659 | ||
5660 | /* ************************************************************************ | |
5661 | * * GCC builtins support * | |
5662 | * ************************************************************************ */ | |
5663 | ||
5664 | /* The general scheme is fairly simple: | |
5665 | ||
5666 | For each builtin function/type to be declared, gnat_install_builtins calls | |
5667 | internal facilities which eventually get to gnat_push_decl, which in turn | |
5668 | tracks the so declared builtin function decls in the 'builtin_decls' global | |
5669 | datastructure. When an Intrinsic subprogram declaration is processed, we | |
5670 | search this global datastructure to retrieve the associated BUILT_IN DECL | |
5671 | node. */ | |
5672 | ||
5673 | /* Search the chain of currently available builtin declarations for a node | |
5674 | corresponding to function NAME (an IDENTIFIER_NODE). Return the first node | |
5675 | found, if any, or NULL_TREE otherwise. */ | |
5676 | tree | |
5677 | builtin_decl_for (tree name) | |
5678 | { | |
5679 | unsigned i; | |
5680 | tree decl; | |
5681 | ||
9771b263 | 5682 | FOR_EACH_VEC_SAFE_ELT (builtin_decls, i, decl) |
a1ab4c31 AC |
5683 | if (DECL_NAME (decl) == name) |
5684 | return decl; | |
5685 | ||
5686 | return NULL_TREE; | |
5687 | } | |
5688 | ||
5689 | /* The code below eventually exposes gnat_install_builtins, which declares | |
5690 | the builtin types and functions we might need, either internally or as | |
5691 | user accessible facilities. | |
5692 | ||
5693 | ??? This is a first implementation shot, still in rough shape. It is | |
5694 | heavily inspired from the "C" family implementation, with chunks copied | |
5695 | verbatim from there. | |
5696 | ||
5697 | Two obvious TODO candidates are | |
5698 | o Use a more efficient name/decl mapping scheme | |
5699 | o Devise a middle-end infrastructure to avoid having to copy | |
5700 | pieces between front-ends. */ | |
5701 | ||
5702 | /* ----------------------------------------------------------------------- * | |
5703 | * BUILTIN ELEMENTARY TYPES * | |
5704 | * ----------------------------------------------------------------------- */ | |
5705 | ||
5706 | /* Standard data types to be used in builtin argument declarations. */ | |
5707 | ||
5708 | enum c_tree_index | |
5709 | { | |
5710 | CTI_SIGNED_SIZE_TYPE, /* For format checking only. */ | |
5711 | CTI_STRING_TYPE, | |
5712 | CTI_CONST_STRING_TYPE, | |
5713 | ||
5714 | CTI_MAX | |
5715 | }; | |
5716 | ||
5717 | static tree c_global_trees[CTI_MAX]; | |
5718 | ||
5719 | #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE] | |
5720 | #define string_type_node c_global_trees[CTI_STRING_TYPE] | |
5721 | #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE] | |
5722 | ||
5723 | /* ??? In addition some attribute handlers, we currently don't support a | |
5724 | (small) number of builtin-types, which in turns inhibits support for a | |
5725 | number of builtin functions. */ | |
5726 | #define wint_type_node void_type_node | |
5727 | #define intmax_type_node void_type_node | |
5728 | #define uintmax_type_node void_type_node | |
5729 | ||
5730 | /* Build the void_list_node (void_type_node having been created). */ | |
5731 | ||
5732 | static tree | |
5733 | build_void_list_node (void) | |
5734 | { | |
5735 | tree t = build_tree_list (NULL_TREE, void_type_node); | |
5736 | return t; | |
5737 | } | |
5738 | ||
5739 | /* Used to help initialize the builtin-types.def table. When a type of | |
5740 | the correct size doesn't exist, use error_mark_node instead of NULL. | |
5741 | The later results in segfaults even when a decl using the type doesn't | |
5742 | get invoked. */ | |
5743 | ||
5744 | static tree | |
5745 | builtin_type_for_size (int size, bool unsignedp) | |
5746 | { | |
ced57283 | 5747 | tree type = gnat_type_for_size (size, unsignedp); |
a1ab4c31 AC |
5748 | return type ? type : error_mark_node; |
5749 | } | |
5750 | ||
5751 | /* Build/push the elementary type decls that builtin functions/types | |
5752 | will need. */ | |
5753 | ||
5754 | static void | |
5755 | install_builtin_elementary_types (void) | |
5756 | { | |
728936bb | 5757 | signed_size_type_node = gnat_signed_type (size_type_node); |
a1ab4c31 AC |
5758 | pid_type_node = integer_type_node; |
5759 | void_list_node = build_void_list_node (); | |
5760 | ||
5761 | string_type_node = build_pointer_type (char_type_node); | |
5762 | const_string_type_node | |
5763 | = build_pointer_type (build_qualified_type | |
5764 | (char_type_node, TYPE_QUAL_CONST)); | |
5765 | } | |
5766 | ||
5767 | /* ----------------------------------------------------------------------- * | |
5768 | * BUILTIN FUNCTION TYPES * | |
5769 | * ----------------------------------------------------------------------- */ | |
5770 | ||
5771 | /* Now, builtin function types per se. */ | |
5772 | ||
5773 | enum c_builtin_type | |
5774 | { | |
5775 | #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, | |
5776 | #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, | |
5777 | #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, | |
5778 | #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, | |
5779 | #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
5780 | #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
5781 | #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME, | |
5782 | #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME, | |
5783 | #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME, | |
acf0174b | 5784 | #define DEF_FUNCTION_TYPE_8(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7, ARG8) NAME, |
a1ab4c31 AC |
5785 | #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, |
5786 | #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, | |
5787 | #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, | |
5788 | #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
5789 | #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
5790 | #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \ | |
5791 | NAME, | |
5792 | #define DEF_POINTER_TYPE(NAME, TYPE) NAME, | |
5793 | #include "builtin-types.def" | |
5794 | #undef DEF_PRIMITIVE_TYPE | |
5795 | #undef DEF_FUNCTION_TYPE_0 | |
5796 | #undef DEF_FUNCTION_TYPE_1 | |
5797 | #undef DEF_FUNCTION_TYPE_2 | |
5798 | #undef DEF_FUNCTION_TYPE_3 | |
5799 | #undef DEF_FUNCTION_TYPE_4 | |
5800 | #undef DEF_FUNCTION_TYPE_5 | |
5801 | #undef DEF_FUNCTION_TYPE_6 | |
5802 | #undef DEF_FUNCTION_TYPE_7 | |
acf0174b | 5803 | #undef DEF_FUNCTION_TYPE_8 |
a1ab4c31 AC |
5804 | #undef DEF_FUNCTION_TYPE_VAR_0 |
5805 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
5806 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
5807 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
5808 | #undef DEF_FUNCTION_TYPE_VAR_4 | |
5809 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
5810 | #undef DEF_POINTER_TYPE | |
5811 | BT_LAST | |
5812 | }; | |
5813 | ||
5814 | typedef enum c_builtin_type builtin_type; | |
5815 | ||
5816 | /* A temporary array used in communication with def_fn_type. */ | |
5817 | static GTY(()) tree builtin_types[(int) BT_LAST + 1]; | |
5818 | ||
5819 | /* A helper function for install_builtin_types. Build function type | |
5820 | for DEF with return type RET and N arguments. If VAR is true, then the | |
5821 | function should be variadic after those N arguments. | |
5822 | ||
5823 | Takes special care not to ICE if any of the types involved are | |
5824 | error_mark_node, which indicates that said type is not in fact available | |
5825 | (see builtin_type_for_size). In which case the function type as a whole | |
5826 | should be error_mark_node. */ | |
5827 | ||
5828 | static void | |
5829 | def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...) | |
5830 | { | |
e5b00edf NF |
5831 | tree t; |
5832 | tree *args = XALLOCAVEC (tree, n); | |
a1ab4c31 AC |
5833 | va_list list; |
5834 | int i; | |
5835 | ||
5836 | va_start (list, n); | |
5837 | for (i = 0; i < n; ++i) | |
5838 | { | |
c6bd4220 | 5839 | builtin_type a = (builtin_type) va_arg (list, int); |
a1ab4c31 AC |
5840 | t = builtin_types[a]; |
5841 | if (t == error_mark_node) | |
5842 | goto egress; | |
e5b00edf | 5843 | args[i] = t; |
a1ab4c31 | 5844 | } |
a1ab4c31 | 5845 | |
a1ab4c31 AC |
5846 | t = builtin_types[ret]; |
5847 | if (t == error_mark_node) | |
5848 | goto egress; | |
e5b00edf NF |
5849 | if (var) |
5850 | t = build_varargs_function_type_array (t, n, args); | |
5851 | else | |
5852 | t = build_function_type_array (t, n, args); | |
a1ab4c31 AC |
5853 | |
5854 | egress: | |
5855 | builtin_types[def] = t; | |
0edf1bb2 | 5856 | va_end (list); |
a1ab4c31 AC |
5857 | } |
5858 | ||
5859 | /* Build the builtin function types and install them in the builtin_types | |
5860 | array for later use in builtin function decls. */ | |
5861 | ||
5862 | static void | |
5863 | install_builtin_function_types (void) | |
5864 | { | |
5865 | tree va_list_ref_type_node; | |
5866 | tree va_list_arg_type_node; | |
5867 | ||
5868 | if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) | |
5869 | { | |
5870 | va_list_arg_type_node = va_list_ref_type_node = | |
5871 | build_pointer_type (TREE_TYPE (va_list_type_node)); | |
5872 | } | |
5873 | else | |
5874 | { | |
5875 | va_list_arg_type_node = va_list_type_node; | |
5876 | va_list_ref_type_node = build_reference_type (va_list_type_node); | |
5877 | } | |
5878 | ||
5879 | #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ | |
5880 | builtin_types[ENUM] = VALUE; | |
5881 | #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ | |
5882 | def_fn_type (ENUM, RETURN, 0, 0); | |
5883 | #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ | |
5884 | def_fn_type (ENUM, RETURN, 0, 1, ARG1); | |
5885 | #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ | |
5886 | def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2); | |
5887 | #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
5888 | def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3); | |
5889 | #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
5890 | def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4); | |
5891 | #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
5892 | def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
5893 | #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5894 | ARG6) \ | |
5895 | def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6); | |
5896 | #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5897 | ARG6, ARG7) \ | |
5898 | def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7); | |
acf0174b JJ |
5899 | #define DEF_FUNCTION_TYPE_8(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
5900 | ARG6, ARG7, ARG8) \ | |
5901 | def_fn_type (ENUM, RETURN, 0, 8, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, \ | |
5902 | ARG7, ARG8); | |
a1ab4c31 AC |
5903 | #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ |
5904 | def_fn_type (ENUM, RETURN, 1, 0); | |
5905 | #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ | |
5906 | def_fn_type (ENUM, RETURN, 1, 1, ARG1); | |
5907 | #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ | |
5908 | def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2); | |
5909 | #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
5910 | def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3); | |
5911 | #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
5912 | def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4); | |
5913 | #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
5914 | def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
5915 | #define DEF_POINTER_TYPE(ENUM, TYPE) \ | |
5916 | builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]); | |
5917 | ||
5918 | #include "builtin-types.def" | |
5919 | ||
5920 | #undef DEF_PRIMITIVE_TYPE | |
5921 | #undef DEF_FUNCTION_TYPE_1 | |
5922 | #undef DEF_FUNCTION_TYPE_2 | |
5923 | #undef DEF_FUNCTION_TYPE_3 | |
5924 | #undef DEF_FUNCTION_TYPE_4 | |
5925 | #undef DEF_FUNCTION_TYPE_5 | |
5926 | #undef DEF_FUNCTION_TYPE_6 | |
5927 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
5928 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
5929 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
5930 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
5931 | #undef DEF_FUNCTION_TYPE_VAR_4 | |
5932 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
5933 | #undef DEF_POINTER_TYPE | |
5934 | builtin_types[(int) BT_LAST] = NULL_TREE; | |
5935 | } | |
5936 | ||
5937 | /* ----------------------------------------------------------------------- * | |
5938 | * BUILTIN ATTRIBUTES * | |
5939 | * ----------------------------------------------------------------------- */ | |
5940 | ||
5941 | enum built_in_attribute | |
5942 | { | |
5943 | #define DEF_ATTR_NULL_TREE(ENUM) ENUM, | |
5944 | #define DEF_ATTR_INT(ENUM, VALUE) ENUM, | |
e384e6b5 | 5945 | #define DEF_ATTR_STRING(ENUM, VALUE) ENUM, |
a1ab4c31 AC |
5946 | #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, |
5947 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, | |
5948 | #include "builtin-attrs.def" | |
5949 | #undef DEF_ATTR_NULL_TREE | |
5950 | #undef DEF_ATTR_INT | |
e384e6b5 | 5951 | #undef DEF_ATTR_STRING |
a1ab4c31 AC |
5952 | #undef DEF_ATTR_IDENT |
5953 | #undef DEF_ATTR_TREE_LIST | |
5954 | ATTR_LAST | |
5955 | }; | |
5956 | ||
5957 | static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; | |
5958 | ||
5959 | static void | |
5960 | install_builtin_attributes (void) | |
5961 | { | |
5962 | /* Fill in the built_in_attributes array. */ | |
5963 | #define DEF_ATTR_NULL_TREE(ENUM) \ | |
5964 | built_in_attributes[(int) ENUM] = NULL_TREE; | |
5965 | #define DEF_ATTR_INT(ENUM, VALUE) \ | |
5966 | built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE); | |
e384e6b5 BS |
5967 | #define DEF_ATTR_STRING(ENUM, VALUE) \ |
5968 | built_in_attributes[(int) ENUM] = build_string (strlen (VALUE), VALUE); | |
a1ab4c31 AC |
5969 | #define DEF_ATTR_IDENT(ENUM, STRING) \ |
5970 | built_in_attributes[(int) ENUM] = get_identifier (STRING); | |
5971 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ | |
5972 | built_in_attributes[(int) ENUM] \ | |
5973 | = tree_cons (built_in_attributes[(int) PURPOSE], \ | |
5974 | built_in_attributes[(int) VALUE], \ | |
5975 | built_in_attributes[(int) CHAIN]); | |
5976 | #include "builtin-attrs.def" | |
5977 | #undef DEF_ATTR_NULL_TREE | |
5978 | #undef DEF_ATTR_INT | |
e384e6b5 | 5979 | #undef DEF_ATTR_STRING |
a1ab4c31 AC |
5980 | #undef DEF_ATTR_IDENT |
5981 | #undef DEF_ATTR_TREE_LIST | |
5982 | } | |
5983 | ||
5984 | /* Handle a "const" attribute; arguments as in | |
5985 | struct attribute_spec.handler. */ | |
5986 | ||
5987 | static tree | |
5988 | handle_const_attribute (tree *node, tree ARG_UNUSED (name), | |
5989 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5990 | bool *no_add_attrs) | |
5991 | { | |
5992 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5993 | TREE_READONLY (*node) = 1; | |
5994 | else | |
5995 | *no_add_attrs = true; | |
5996 | ||
5997 | return NULL_TREE; | |
5998 | } | |
5999 | ||
6000 | /* Handle a "nothrow" attribute; arguments as in | |
6001 | struct attribute_spec.handler. */ | |
6002 | ||
6003 | static tree | |
6004 | handle_nothrow_attribute (tree *node, tree ARG_UNUSED (name), | |
6005 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
6006 | bool *no_add_attrs) | |
6007 | { | |
6008 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
6009 | TREE_NOTHROW (*node) = 1; | |
6010 | else | |
6011 | *no_add_attrs = true; | |
6012 | ||
6013 | return NULL_TREE; | |
6014 | } | |
6015 | ||
6016 | /* Handle a "pure" attribute; arguments as in | |
6017 | struct attribute_spec.handler. */ | |
6018 | ||
6019 | static tree | |
6020 | handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6021 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6022 | { | |
6023 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
6024 | DECL_PURE_P (*node) = 1; | |
6025 | /* ??? TODO: Support types. */ | |
6026 | else | |
6027 | { | |
7948ae37 OH |
6028 | warning (OPT_Wattributes, "%qs attribute ignored", |
6029 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
6030 | *no_add_attrs = true; |
6031 | } | |
6032 | ||
6033 | return NULL_TREE; | |
6034 | } | |
6035 | ||
6036 | /* Handle a "no vops" attribute; arguments as in | |
6037 | struct attribute_spec.handler. */ | |
6038 | ||
6039 | static tree | |
6040 | handle_novops_attribute (tree *node, tree ARG_UNUSED (name), | |
6041 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
6042 | bool *ARG_UNUSED (no_add_attrs)) | |
6043 | { | |
6044 | gcc_assert (TREE_CODE (*node) == FUNCTION_DECL); | |
6045 | DECL_IS_NOVOPS (*node) = 1; | |
6046 | return NULL_TREE; | |
6047 | } | |
6048 | ||
6049 | /* Helper for nonnull attribute handling; fetch the operand number | |
6050 | from the attribute argument list. */ | |
6051 | ||
6052 | static bool | |
6053 | get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) | |
6054 | { | |
6055 | /* Verify the arg number is a constant. */ | |
6056 | if (TREE_CODE (arg_num_expr) != INTEGER_CST | |
6057 | || TREE_INT_CST_HIGH (arg_num_expr) != 0) | |
6058 | return false; | |
6059 | ||
6060 | *valp = TREE_INT_CST_LOW (arg_num_expr); | |
6061 | return true; | |
6062 | } | |
6063 | ||
6064 | /* Handle the "nonnull" attribute. */ | |
6065 | static tree | |
6066 | handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name), | |
6067 | tree args, int ARG_UNUSED (flags), | |
6068 | bool *no_add_attrs) | |
6069 | { | |
6070 | tree type = *node; | |
6071 | unsigned HOST_WIDE_INT attr_arg_num; | |
6072 | ||
6073 | /* If no arguments are specified, all pointer arguments should be | |
6074 | non-null. Verify a full prototype is given so that the arguments | |
6075 | will have the correct types when we actually check them later. */ | |
6076 | if (!args) | |
6077 | { | |
f4da8dce | 6078 | if (!prototype_p (type)) |
a1ab4c31 AC |
6079 | { |
6080 | error ("nonnull attribute without arguments on a non-prototype"); | |
6081 | *no_add_attrs = true; | |
6082 | } | |
6083 | return NULL_TREE; | |
6084 | } | |
6085 | ||
6086 | /* Argument list specified. Verify that each argument number references | |
6087 | a pointer argument. */ | |
6088 | for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) | |
6089 | { | |
a1ab4c31 AC |
6090 | unsigned HOST_WIDE_INT arg_num = 0, ck_num; |
6091 | ||
6092 | if (!get_nonnull_operand (TREE_VALUE (args), &arg_num)) | |
6093 | { | |
6094 | error ("nonnull argument has invalid operand number (argument %lu)", | |
6095 | (unsigned long) attr_arg_num); | |
6096 | *no_add_attrs = true; | |
6097 | return NULL_TREE; | |
6098 | } | |
6099 | ||
d7d058c5 | 6100 | if (prototype_p (type)) |
a1ab4c31 | 6101 | { |
d7d058c5 NF |
6102 | function_args_iterator iter; |
6103 | tree argument; | |
6104 | ||
6105 | function_args_iter_init (&iter, type); | |
6106 | for (ck_num = 1; ; ck_num++, function_args_iter_next (&iter)) | |
a1ab4c31 | 6107 | { |
d7d058c5 | 6108 | argument = function_args_iter_cond (&iter); |
a1ab4c31 AC |
6109 | if (!argument || ck_num == arg_num) |
6110 | break; | |
a1ab4c31 AC |
6111 | } |
6112 | ||
6113 | if (!argument | |
d7d058c5 | 6114 | || TREE_CODE (argument) == VOID_TYPE) |
a1ab4c31 | 6115 | { |
58c8f770 EB |
6116 | error ("nonnull argument with out-of-range operand number " |
6117 | "(argument %lu, operand %lu)", | |
a1ab4c31 AC |
6118 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
6119 | *no_add_attrs = true; | |
6120 | return NULL_TREE; | |
6121 | } | |
6122 | ||
d7d058c5 | 6123 | if (TREE_CODE (argument) != POINTER_TYPE) |
a1ab4c31 | 6124 | { |
58c8f770 EB |
6125 | error ("nonnull argument references non-pointer operand " |
6126 | "(argument %lu, operand %lu)", | |
a1ab4c31 AC |
6127 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
6128 | *no_add_attrs = true; | |
6129 | return NULL_TREE; | |
6130 | } | |
6131 | } | |
6132 | } | |
6133 | ||
6134 | return NULL_TREE; | |
6135 | } | |
6136 | ||
6137 | /* Handle a "sentinel" attribute. */ | |
6138 | ||
6139 | static tree | |
6140 | handle_sentinel_attribute (tree *node, tree name, tree args, | |
6141 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6142 | { | |
f4da8dce | 6143 | if (!prototype_p (*node)) |
a1ab4c31 AC |
6144 | { |
6145 | warning (OPT_Wattributes, | |
7948ae37 OH |
6146 | "%qs attribute requires prototypes with named arguments", |
6147 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
6148 | *no_add_attrs = true; |
6149 | } | |
6150 | else | |
6151 | { | |
dcf0c47e | 6152 | if (!stdarg_p (*node)) |
a1ab4c31 AC |
6153 | { |
6154 | warning (OPT_Wattributes, | |
7948ae37 OH |
6155 | "%qs attribute only applies to variadic functions", |
6156 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
6157 | *no_add_attrs = true; |
6158 | } | |
6159 | } | |
6160 | ||
6161 | if (args) | |
6162 | { | |
6163 | tree position = TREE_VALUE (args); | |
6164 | ||
6165 | if (TREE_CODE (position) != INTEGER_CST) | |
6166 | { | |
6167 | warning (0, "requested position is not an integer constant"); | |
6168 | *no_add_attrs = true; | |
6169 | } | |
6170 | else | |
6171 | { | |
6172 | if (tree_int_cst_lt (position, integer_zero_node)) | |
6173 | { | |
6174 | warning (0, "requested position is less than zero"); | |
6175 | *no_add_attrs = true; | |
6176 | } | |
6177 | } | |
6178 | } | |
6179 | ||
6180 | return NULL_TREE; | |
6181 | } | |
6182 | ||
6183 | /* Handle a "noreturn" attribute; arguments as in | |
6184 | struct attribute_spec.handler. */ | |
6185 | ||
6186 | static tree | |
6187 | handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6188 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6189 | { | |
6190 | tree type = TREE_TYPE (*node); | |
6191 | ||
6192 | /* See FIXME comment in c_common_attribute_table. */ | |
6193 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
6194 | TREE_THIS_VOLATILE (*node) = 1; | |
6195 | else if (TREE_CODE (type) == POINTER_TYPE | |
6196 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
6197 | TREE_TYPE (*node) | |
6198 | = build_pointer_type | |
6199 | (build_type_variant (TREE_TYPE (type), | |
6200 | TYPE_READONLY (TREE_TYPE (type)), 1)); | |
6201 | else | |
6202 | { | |
7948ae37 OH |
6203 | warning (OPT_Wattributes, "%qs attribute ignored", |
6204 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
6205 | *no_add_attrs = true; |
6206 | } | |
6207 | ||
6208 | return NULL_TREE; | |
6209 | } | |
6210 | ||
0d6e14fd JH |
6211 | /* Handle a "leaf" attribute; arguments as in |
6212 | struct attribute_spec.handler. */ | |
6213 | ||
6214 | static tree | |
6215 | handle_leaf_attribute (tree *node, tree name, | |
6216 | tree ARG_UNUSED (args), | |
6217 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6218 | { | |
6219 | if (TREE_CODE (*node) != FUNCTION_DECL) | |
6220 | { | |
6221 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6222 | *no_add_attrs = true; | |
6223 | } | |
6224 | if (!TREE_PUBLIC (*node)) | |
6225 | { | |
32a5388a | 6226 | warning (OPT_Wattributes, "%qE attribute has no effect", name); |
0d6e14fd JH |
6227 | *no_add_attrs = true; |
6228 | } | |
6229 | ||
6230 | return NULL_TREE; | |
6231 | } | |
6232 | ||
a1ab4c31 AC |
6233 | /* Handle a "malloc" attribute; arguments as in |
6234 | struct attribute_spec.handler. */ | |
6235 | ||
6236 | static tree | |
6237 | handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6238 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6239 | { | |
6240 | if (TREE_CODE (*node) == FUNCTION_DECL | |
6241 | && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node)))) | |
6242 | DECL_IS_MALLOC (*node) = 1; | |
6243 | else | |
6244 | { | |
7948ae37 OH |
6245 | warning (OPT_Wattributes, "%qs attribute ignored", |
6246 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
6247 | *no_add_attrs = true; |
6248 | } | |
6249 | ||
6250 | return NULL_TREE; | |
6251 | } | |
6252 | ||
6253 | /* Fake handler for attributes we don't properly support. */ | |
6254 | ||
6255 | tree | |
6256 | fake_attribute_handler (tree * ARG_UNUSED (node), | |
6257 | tree ARG_UNUSED (name), | |
6258 | tree ARG_UNUSED (args), | |
6259 | int ARG_UNUSED (flags), | |
6260 | bool * ARG_UNUSED (no_add_attrs)) | |
6261 | { | |
6262 | return NULL_TREE; | |
6263 | } | |
6264 | ||
6265 | /* Handle a "type_generic" attribute. */ | |
6266 | ||
6267 | static tree | |
6268 | handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name), | |
6269 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
6270 | bool * ARG_UNUSED (no_add_attrs)) | |
6271 | { | |
a1ab4c31 AC |
6272 | /* Ensure we have a function type. */ |
6273 | gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE); | |
b4680ca1 | 6274 | |
a1ab4c31 | 6275 | /* Ensure we have a variadic function. */ |
dcf0c47e | 6276 | gcc_assert (!prototype_p (*node) || stdarg_p (*node)); |
a1ab4c31 AC |
6277 | |
6278 | return NULL_TREE; | |
6279 | } | |
6280 | ||
2724e58f OH |
6281 | /* Handle a "vector_size" attribute; arguments as in |
6282 | struct attribute_spec.handler. */ | |
6283 | ||
6284 | static tree | |
6285 | handle_vector_size_attribute (tree *node, tree name, tree args, | |
6286 | int ARG_UNUSED (flags), | |
6287 | bool *no_add_attrs) | |
6288 | { | |
6289 | unsigned HOST_WIDE_INT vecsize, nunits; | |
6290 | enum machine_mode orig_mode; | |
6291 | tree type = *node, new_type, size; | |
6292 | ||
6293 | *no_add_attrs = true; | |
6294 | ||
6295 | size = TREE_VALUE (args); | |
6296 | ||
6297 | if (!host_integerp (size, 1)) | |
6298 | { | |
7948ae37 OH |
6299 | warning (OPT_Wattributes, "%qs attribute ignored", |
6300 | IDENTIFIER_POINTER (name)); | |
2724e58f OH |
6301 | return NULL_TREE; |
6302 | } | |
6303 | ||
6304 | /* Get the vector size (in bytes). */ | |
6305 | vecsize = tree_low_cst (size, 1); | |
6306 | ||
6307 | /* We need to provide for vector pointers, vector arrays, and | |
6308 | functions returning vectors. For example: | |
6309 | ||
6310 | __attribute__((vector_size(16))) short *foo; | |
6311 | ||
6312 | In this case, the mode is SI, but the type being modified is | |
6313 | HI, so we need to look further. */ | |
6314 | ||
6315 | while (POINTER_TYPE_P (type) | |
6316 | || TREE_CODE (type) == FUNCTION_TYPE | |
132a5459 | 6317 | || TREE_CODE (type) == ARRAY_TYPE) |
2724e58f OH |
6318 | type = TREE_TYPE (type); |
6319 | ||
6320 | /* Get the mode of the type being modified. */ | |
6321 | orig_mode = TYPE_MODE (type); | |
6322 | ||
6323 | if ((!INTEGRAL_TYPE_P (type) | |
6324 | && !SCALAR_FLOAT_TYPE_P (type) | |
6325 | && !FIXED_POINT_TYPE_P (type)) | |
6326 | || (!SCALAR_FLOAT_MODE_P (orig_mode) | |
6327 | && GET_MODE_CLASS (orig_mode) != MODE_INT | |
6328 | && !ALL_SCALAR_FIXED_POINT_MODE_P (orig_mode)) | |
6329 | || !host_integerp (TYPE_SIZE_UNIT (type), 1) | |
6330 | || TREE_CODE (type) == BOOLEAN_TYPE) | |
6331 | { | |
7948ae37 OH |
6332 | error ("invalid vector type for attribute %qs", |
6333 | IDENTIFIER_POINTER (name)); | |
2724e58f OH |
6334 | return NULL_TREE; |
6335 | } | |
6336 | ||
6337 | if (vecsize % tree_low_cst (TYPE_SIZE_UNIT (type), 1)) | |
6338 | { | |
6339 | error ("vector size not an integral multiple of component size"); | |
6340 | return NULL; | |
6341 | } | |
6342 | ||
6343 | if (vecsize == 0) | |
6344 | { | |
6345 | error ("zero vector size"); | |
6346 | return NULL; | |
6347 | } | |
6348 | ||
6349 | /* Calculate how many units fit in the vector. */ | |
6350 | nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
6351 | if (nunits & (nunits - 1)) | |
6352 | { | |
6353 | error ("number of components of the vector not a power of two"); | |
6354 | return NULL_TREE; | |
6355 | } | |
6356 | ||
6357 | new_type = build_vector_type (type, nunits); | |
6358 | ||
6359 | /* Build back pointers if needed. */ | |
9b469089 | 6360 | *node = reconstruct_complex_type (*node, new_type); |
2724e58f OH |
6361 | |
6362 | return NULL_TREE; | |
6363 | } | |
6364 | ||
7948ae37 OH |
6365 | /* Handle a "vector_type" attribute; arguments as in |
6366 | struct attribute_spec.handler. */ | |
6367 | ||
6368 | static tree | |
6369 | handle_vector_type_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6370 | int ARG_UNUSED (flags), | |
6371 | bool *no_add_attrs) | |
6372 | { | |
6373 | /* Vector representative type and size. */ | |
6374 | tree rep_type = *node; | |
6375 | tree rep_size = TYPE_SIZE_UNIT (rep_type); | |
7948ae37 OH |
6376 | |
6377 | /* Vector size in bytes and number of units. */ | |
6378 | unsigned HOST_WIDE_INT vec_bytes, vec_units; | |
6379 | ||
6380 | /* Vector element type and mode. */ | |
6381 | tree elem_type; | |
6382 | enum machine_mode elem_mode; | |
6383 | ||
6384 | *no_add_attrs = true; | |
6385 | ||
7948ae37 OH |
6386 | if (TREE_CODE (rep_type) != ARRAY_TYPE) |
6387 | { | |
6388 | error ("attribute %qs applies to array types only", | |
6389 | IDENTIFIER_POINTER (name)); | |
6390 | return NULL_TREE; | |
6391 | } | |
6392 | ||
6393 | /* Silently punt on variable sizes. We can't make vector types for them, | |
6394 | need to ignore them on front-end generated subtypes of unconstrained | |
6395 | bases, and this attribute is for binding implementors, not end-users, so | |
6396 | we should never get there from legitimate explicit uses. */ | |
6397 | ||
6398 | if (!host_integerp (rep_size, 1)) | |
6399 | return NULL_TREE; | |
6400 | ||
6401 | /* Get the element type/mode and check this is something we know | |
6402 | how to make vectors of. */ | |
6403 | ||
6404 | elem_type = TREE_TYPE (rep_type); | |
6405 | elem_mode = TYPE_MODE (elem_type); | |
6406 | ||
6407 | if ((!INTEGRAL_TYPE_P (elem_type) | |
6408 | && !SCALAR_FLOAT_TYPE_P (elem_type) | |
6409 | && !FIXED_POINT_TYPE_P (elem_type)) | |
6410 | || (!SCALAR_FLOAT_MODE_P (elem_mode) | |
6411 | && GET_MODE_CLASS (elem_mode) != MODE_INT | |
6412 | && !ALL_SCALAR_FIXED_POINT_MODE_P (elem_mode)) | |
6413 | || !host_integerp (TYPE_SIZE_UNIT (elem_type), 1)) | |
6414 | { | |
6415 | error ("invalid element type for attribute %qs", | |
6416 | IDENTIFIER_POINTER (name)); | |
6417 | return NULL_TREE; | |
6418 | } | |
6419 | ||
6420 | /* Sanity check the vector size and element type consistency. */ | |
6421 | ||
6422 | vec_bytes = tree_low_cst (rep_size, 1); | |
6423 | ||
6424 | if (vec_bytes % tree_low_cst (TYPE_SIZE_UNIT (elem_type), 1)) | |
6425 | { | |
6426 | error ("vector size not an integral multiple of component size"); | |
6427 | return NULL; | |
6428 | } | |
6429 | ||
6430 | if (vec_bytes == 0) | |
6431 | { | |
6432 | error ("zero vector size"); | |
6433 | return NULL; | |
6434 | } | |
6435 | ||
6436 | vec_units = vec_bytes / tree_low_cst (TYPE_SIZE_UNIT (elem_type), 1); | |
6437 | if (vec_units & (vec_units - 1)) | |
6438 | { | |
6439 | error ("number of components of the vector not a power of two"); | |
6440 | return NULL_TREE; | |
6441 | } | |
6442 | ||
6443 | /* Build the vector type and replace. */ | |
6444 | ||
6445 | *node = build_vector_type (elem_type, vec_units); | |
7948ae37 OH |
6446 | TYPE_REPRESENTATIVE_ARRAY (*node) = rep_type; |
6447 | ||
6448 | return NULL_TREE; | |
6449 | } | |
6450 | ||
a1ab4c31 AC |
6451 | /* ----------------------------------------------------------------------- * |
6452 | * BUILTIN FUNCTIONS * | |
6453 | * ----------------------------------------------------------------------- */ | |
6454 | ||
6455 | /* Worker for DEF_BUILTIN. Possibly define a builtin function with one or two | |
6456 | names. Does not declare a non-__builtin_ function if flag_no_builtin, or | |
6457 | if nonansi_p and flag_no_nonansi_builtin. */ | |
6458 | ||
6459 | static void | |
6460 | def_builtin_1 (enum built_in_function fncode, | |
6461 | const char *name, | |
6462 | enum built_in_class fnclass, | |
6463 | tree fntype, tree libtype, | |
6464 | bool both_p, bool fallback_p, | |
6465 | bool nonansi_p ATTRIBUTE_UNUSED, | |
6466 | tree fnattrs, bool implicit_p) | |
6467 | { | |
6468 | tree decl; | |
6469 | const char *libname; | |
6470 | ||
6471 | /* Preserve an already installed decl. It most likely was setup in advance | |
6472 | (e.g. as part of the internal builtins) for specific reasons. */ | |
e79983f4 | 6473 | if (builtin_decl_explicit (fncode) != NULL_TREE) |
a1ab4c31 AC |
6474 | return; |
6475 | ||
6476 | gcc_assert ((!both_p && !fallback_p) | |
6477 | || !strncmp (name, "__builtin_", | |
6478 | strlen ("__builtin_"))); | |
6479 | ||
6480 | libname = name + strlen ("__builtin_"); | |
6481 | decl = add_builtin_function (name, fntype, fncode, fnclass, | |
6482 | (fallback_p ? libname : NULL), | |
6483 | fnattrs); | |
6484 | if (both_p) | |
6485 | /* ??? This is normally further controlled by command-line options | |
6486 | like -fno-builtin, but we don't have them for Ada. */ | |
6487 | add_builtin_function (libname, libtype, fncode, fnclass, | |
6488 | NULL, fnattrs); | |
6489 | ||
e79983f4 | 6490 | set_builtin_decl (fncode, decl, implicit_p); |
a1ab4c31 AC |
6491 | } |
6492 | ||
6493 | static int flag_isoc94 = 0; | |
6494 | static int flag_isoc99 = 0; | |
6495 | ||
6496 | /* Install what the common builtins.def offers. */ | |
6497 | ||
6498 | static void | |
6499 | install_builtin_functions (void) | |
6500 | { | |
6501 | #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \ | |
6502 | NONANSI_P, ATTRS, IMPLICIT, COND) \ | |
6503 | if (NAME && COND) \ | |
6504 | def_builtin_1 (ENUM, NAME, CLASS, \ | |
6505 | builtin_types[(int) TYPE], \ | |
6506 | builtin_types[(int) LIBTYPE], \ | |
6507 | BOTH_P, FALLBACK_P, NONANSI_P, \ | |
6508 | built_in_attributes[(int) ATTRS], IMPLICIT); | |
6509 | #include "builtins.def" | |
6510 | #undef DEF_BUILTIN | |
6511 | } | |
6512 | ||
6513 | /* ----------------------------------------------------------------------- * | |
6514 | * BUILTIN FUNCTIONS * | |
6515 | * ----------------------------------------------------------------------- */ | |
6516 | ||
6517 | /* Install the builtin functions we might need. */ | |
6518 | ||
6519 | void | |
6520 | gnat_install_builtins (void) | |
6521 | { | |
6522 | install_builtin_elementary_types (); | |
6523 | install_builtin_function_types (); | |
6524 | install_builtin_attributes (); | |
6525 | ||
6526 | /* Install builtins used by generic middle-end pieces first. Some of these | |
6527 | know about internal specificities and control attributes accordingly, for | |
6528 | instance __builtin_alloca vs no-throw and -fstack-check. We will ignore | |
6529 | the generic definition from builtins.def. */ | |
384c400a | 6530 | build_common_builtin_nodes (); |
a1ab4c31 AC |
6531 | |
6532 | /* Now, install the target specific builtins, such as the AltiVec family on | |
6533 | ppc, and the common set as exposed by builtins.def. */ | |
6534 | targetm.init_builtins (); | |
6535 | install_builtin_functions (); | |
6536 | } | |
6537 | ||
6538 | #include "gt-ada-utils.h" | |
6539 | #include "gtype-ada.h" |