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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 | * * | |
88a94e2b | 9 | * Copyright (C) 1992-2012, 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 | 235 | static bool potential_alignment_gap (tree, tree, tree); |
58c8f770 | 236 | static void process_attributes (tree, struct attrib *); |
a1ab4c31 | 237 | \f |
842d4ee2 | 238 | /* Initialize data structures of the utils.c module. */ |
a1ab4c31 AC |
239 | |
240 | void | |
842d4ee2 | 241 | init_gnat_utils (void) |
a1ab4c31 | 242 | { |
842d4ee2 | 243 | /* Initialize the association of GNAT nodes to GCC trees. */ |
a9429e29 | 244 | associate_gnat_to_gnu = ggc_alloc_cleared_vec_tree (max_gnat_nodes); |
842d4ee2 EB |
245 | |
246 | /* Initialize the association of GNAT nodes to GCC trees as dummies. */ | |
247 | dummy_node_table = ggc_alloc_cleared_vec_tree (max_gnat_nodes); | |
248 | ||
249 | /* Initialize the hash table of padded types. */ | |
250 | pad_type_hash_table = htab_create_ggc (512, pad_type_hash_hash, | |
251 | pad_type_hash_eq, 0); | |
a1ab4c31 AC |
252 | } |
253 | ||
842d4ee2 | 254 | /* Destroy data structures of the utils.c module. */ |
f04b8d69 EB |
255 | |
256 | void | |
842d4ee2 | 257 | destroy_gnat_utils (void) |
f04b8d69 | 258 | { |
842d4ee2 | 259 | /* Destroy the association of GNAT nodes to GCC trees. */ |
f04b8d69 EB |
260 | ggc_free (associate_gnat_to_gnu); |
261 | associate_gnat_to_gnu = NULL; | |
f04b8d69 | 262 | |
842d4ee2 EB |
263 | /* Destroy the association of GNAT nodes to GCC trees as dummies. */ |
264 | ggc_free (dummy_node_table); | |
265 | dummy_node_table = NULL; | |
266 | ||
267 | /* Destroy the hash table of padded types. */ | |
268 | htab_delete (pad_type_hash_table); | |
269 | pad_type_hash_table = NULL; | |
270 | ||
271 | /* Invalidate the global renaming pointers. */ | |
272 | invalidate_global_renaming_pointers (); | |
273 | } | |
274 | \f | |
a1d8cc63 EB |
275 | /* GNAT_ENTITY is a GNAT tree node for an entity. Associate GNU_DECL, a GCC |
276 | tree node, with GNAT_ENTITY. If GNU_DECL is not a ..._DECL node, abort. | |
277 | If NO_CHECK is true, the latter check is suppressed. | |
a1ab4c31 | 278 | |
a1d8cc63 | 279 | If GNU_DECL is zero, reset a previous association. */ |
a1ab4c31 AC |
280 | |
281 | void | |
282 | save_gnu_tree (Entity_Id gnat_entity, tree gnu_decl, bool no_check) | |
283 | { | |
284 | /* Check that GNAT_ENTITY is not already defined and that it is being set | |
a1d8cc63 | 285 | to something which is a decl. If that is not the case, this usually |
a1ab4c31 AC |
286 | means GNAT_ENTITY is defined twice, but occasionally is due to some |
287 | Gigi problem. */ | |
288 | gcc_assert (!(gnu_decl | |
289 | && (PRESENT_GNU_TREE (gnat_entity) | |
290 | || (!no_check && !DECL_P (gnu_decl))))); | |
291 | ||
292 | SET_GNU_TREE (gnat_entity, gnu_decl); | |
293 | } | |
294 | ||
a1d8cc63 EB |
295 | /* GNAT_ENTITY is a GNAT tree node for an entity. Return the GCC tree node |
296 | that was associated with it. If there is no such tree node, abort. | |
a1ab4c31 AC |
297 | |
298 | In some cases, such as delayed elaboration or expressions that need to | |
299 | be elaborated only once, GNAT_ENTITY is really not an entity. */ | |
300 | ||
301 | tree | |
302 | get_gnu_tree (Entity_Id gnat_entity) | |
303 | { | |
304 | gcc_assert (PRESENT_GNU_TREE (gnat_entity)); | |
305 | return GET_GNU_TREE (gnat_entity); | |
306 | } | |
307 | ||
308 | /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */ | |
309 | ||
310 | bool | |
311 | present_gnu_tree (Entity_Id gnat_entity) | |
312 | { | |
313 | return PRESENT_GNU_TREE (gnat_entity); | |
314 | } | |
315 | \f | |
a1ab4c31 AC |
316 | /* Make a dummy type corresponding to GNAT_TYPE. */ |
317 | ||
318 | tree | |
319 | make_dummy_type (Entity_Id gnat_type) | |
320 | { | |
321 | Entity_Id gnat_underlying = Gigi_Equivalent_Type (gnat_type); | |
322 | tree gnu_type; | |
323 | ||
324 | /* If there is an equivalent type, get its underlying type. */ | |
325 | if (Present (gnat_underlying)) | |
a0b8b1b7 | 326 | gnat_underlying = Gigi_Equivalent_Type (Underlying_Type (gnat_underlying)); |
a1ab4c31 AC |
327 | |
328 | /* If there was no equivalent type (can only happen when just annotating | |
329 | types) or underlying type, go back to the original type. */ | |
330 | if (No (gnat_underlying)) | |
331 | gnat_underlying = gnat_type; | |
332 | ||
333 | /* If it there already a dummy type, use that one. Else make one. */ | |
334 | if (PRESENT_DUMMY_NODE (gnat_underlying)) | |
335 | return GET_DUMMY_NODE (gnat_underlying); | |
336 | ||
337 | /* If this is a record, make a RECORD_TYPE or UNION_TYPE; else make | |
338 | an ENUMERAL_TYPE. */ | |
339 | gnu_type = make_node (Is_Record_Type (gnat_underlying) | |
340 | ? tree_code_for_record_type (gnat_underlying) | |
341 | : ENUMERAL_TYPE); | |
342 | TYPE_NAME (gnu_type) = get_entity_name (gnat_type); | |
343 | TYPE_DUMMY_P (gnu_type) = 1; | |
10069d53 EB |
344 | TYPE_STUB_DECL (gnu_type) |
345 | = create_type_stub_decl (TYPE_NAME (gnu_type), gnu_type); | |
a0b8b1b7 EB |
346 | if (Is_By_Reference_Type (gnat_underlying)) |
347 | TYPE_BY_REFERENCE_P (gnu_type) = 1; | |
a1ab4c31 AC |
348 | |
349 | SET_DUMMY_NODE (gnat_underlying, gnu_type); | |
350 | ||
351 | return gnu_type; | |
352 | } | |
e3edbd56 EB |
353 | |
354 | /* Return the dummy type that was made for GNAT_TYPE, if any. */ | |
355 | ||
356 | tree | |
357 | get_dummy_type (Entity_Id gnat_type) | |
358 | { | |
359 | return GET_DUMMY_NODE (gnat_type); | |
360 | } | |
361 | ||
362 | /* Build dummy fat and thin pointer types whose designated type is specified | |
363 | by GNAT_DESIG_TYPE/GNU_DESIG_TYPE and attach them to the latter. */ | |
364 | ||
365 | void | |
366 | build_dummy_unc_pointer_types (Entity_Id gnat_desig_type, tree gnu_desig_type) | |
367 | { | |
368 | tree gnu_template_type, gnu_ptr_template, gnu_array_type, gnu_ptr_array; | |
369 | tree gnu_fat_type, fields, gnu_object_type; | |
370 | ||
371 | gnu_template_type = make_node (RECORD_TYPE); | |
372 | TYPE_NAME (gnu_template_type) = create_concat_name (gnat_desig_type, "XUB"); | |
373 | TYPE_DUMMY_P (gnu_template_type) = 1; | |
374 | gnu_ptr_template = build_pointer_type (gnu_template_type); | |
375 | ||
376 | gnu_array_type = make_node (ENUMERAL_TYPE); | |
377 | TYPE_NAME (gnu_array_type) = create_concat_name (gnat_desig_type, "XUA"); | |
378 | TYPE_DUMMY_P (gnu_array_type) = 1; | |
379 | gnu_ptr_array = build_pointer_type (gnu_array_type); | |
380 | ||
381 | gnu_fat_type = make_node (RECORD_TYPE); | |
382 | /* Build a stub DECL to trigger the special processing for fat pointer types | |
383 | in gnat_pushdecl. */ | |
384 | TYPE_NAME (gnu_fat_type) | |
385 | = create_type_stub_decl (create_concat_name (gnat_desig_type, "XUP"), | |
386 | gnu_fat_type); | |
387 | fields = create_field_decl (get_identifier ("P_ARRAY"), gnu_ptr_array, | |
388 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
389 | DECL_CHAIN (fields) | |
390 | = create_field_decl (get_identifier ("P_BOUNDS"), gnu_ptr_template, | |
391 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
392 | finish_fat_pointer_type (gnu_fat_type, fields); | |
393 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_desig_type); | |
394 | /* Suppress debug info until after the type is completed. */ | |
395 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (gnu_fat_type)) = 1; | |
396 | ||
397 | gnu_object_type = make_node (RECORD_TYPE); | |
398 | TYPE_NAME (gnu_object_type) = create_concat_name (gnat_desig_type, "XUT"); | |
399 | TYPE_DUMMY_P (gnu_object_type) = 1; | |
400 | ||
401 | TYPE_POINTER_TO (gnu_desig_type) = gnu_fat_type; | |
402 | TYPE_OBJECT_RECORD_TYPE (gnu_desig_type) = gnu_object_type; | |
403 | } | |
a1ab4c31 | 404 | \f |
c99c0026 | 405 | /* Return true if we are in the global binding level. */ |
a1ab4c31 | 406 | |
c99c0026 | 407 | bool |
a1ab4c31 AC |
408 | global_bindings_p (void) |
409 | { | |
c99c0026 | 410 | return force_global || current_function_decl == NULL_TREE; |
a1ab4c31 AC |
411 | } |
412 | ||
a09d56d8 | 413 | /* Enter a new binding level. */ |
a1ab4c31 AC |
414 | |
415 | void | |
c6bd4220 | 416 | gnat_pushlevel (void) |
a1ab4c31 AC |
417 | { |
418 | struct gnat_binding_level *newlevel = NULL; | |
419 | ||
420 | /* Reuse a struct for this binding level, if there is one. */ | |
421 | if (free_binding_level) | |
422 | { | |
423 | newlevel = free_binding_level; | |
424 | free_binding_level = free_binding_level->chain; | |
425 | } | |
426 | else | |
a9429e29 | 427 | newlevel = ggc_alloc_gnat_binding_level (); |
a1ab4c31 AC |
428 | |
429 | /* Use a free BLOCK, if any; otherwise, allocate one. */ | |
430 | if (free_block_chain) | |
431 | { | |
432 | newlevel->block = free_block_chain; | |
433 | free_block_chain = BLOCK_CHAIN (free_block_chain); | |
434 | BLOCK_CHAIN (newlevel->block) = NULL_TREE; | |
435 | } | |
436 | else | |
437 | newlevel->block = make_node (BLOCK); | |
438 | ||
439 | /* Point the BLOCK we just made to its parent. */ | |
440 | if (current_binding_level) | |
441 | BLOCK_SUPERCONTEXT (newlevel->block) = current_binding_level->block; | |
442 | ||
a09d56d8 EB |
443 | BLOCK_VARS (newlevel->block) = NULL_TREE; |
444 | BLOCK_SUBBLOCKS (newlevel->block) = NULL_TREE; | |
a1ab4c31 AC |
445 | TREE_USED (newlevel->block) = 1; |
446 | ||
a09d56d8 | 447 | /* Add this level to the front of the chain (stack) of active levels. */ |
a1ab4c31 AC |
448 | newlevel->chain = current_binding_level; |
449 | newlevel->jmpbuf_decl = NULL_TREE; | |
450 | current_binding_level = newlevel; | |
451 | } | |
452 | ||
453 | /* Set SUPERCONTEXT of the BLOCK for the current binding level to FNDECL | |
454 | and point FNDECL to this BLOCK. */ | |
455 | ||
456 | void | |
457 | set_current_block_context (tree fndecl) | |
458 | { | |
459 | BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl; | |
460 | DECL_INITIAL (fndecl) = current_binding_level->block; | |
a09d56d8 | 461 | set_block_for_group (current_binding_level->block); |
a1ab4c31 AC |
462 | } |
463 | ||
464 | /* Set the jmpbuf_decl for the current binding level to DECL. */ | |
465 | ||
466 | void | |
467 | set_block_jmpbuf_decl (tree decl) | |
468 | { | |
469 | current_binding_level->jmpbuf_decl = decl; | |
470 | } | |
471 | ||
472 | /* Get the jmpbuf_decl, if any, for the current binding level. */ | |
473 | ||
474 | tree | |
c6bd4220 | 475 | get_block_jmpbuf_decl (void) |
a1ab4c31 AC |
476 | { |
477 | return current_binding_level->jmpbuf_decl; | |
478 | } | |
479 | ||
a09d56d8 | 480 | /* Exit a binding level. Set any BLOCK into the current code group. */ |
a1ab4c31 AC |
481 | |
482 | void | |
c6bd4220 | 483 | gnat_poplevel (void) |
a1ab4c31 AC |
484 | { |
485 | struct gnat_binding_level *level = current_binding_level; | |
486 | tree block = level->block; | |
487 | ||
488 | BLOCK_VARS (block) = nreverse (BLOCK_VARS (block)); | |
72ac05b0 | 489 | BLOCK_SUBBLOCKS (block) = blocks_nreverse (BLOCK_SUBBLOCKS (block)); |
a1ab4c31 AC |
490 | |
491 | /* If this is a function-level BLOCK don't do anything. Otherwise, if there | |
492 | are no variables free the block and merge its subblocks into those of its | |
a09d56d8 | 493 | parent block. Otherwise, add it to the list of its parent. */ |
a1ab4c31 AC |
494 | if (TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL) |
495 | ; | |
496 | else if (BLOCK_VARS (block) == NULL_TREE) | |
497 | { | |
498 | BLOCK_SUBBLOCKS (level->chain->block) | |
61e46a7d NF |
499 | = block_chainon (BLOCK_SUBBLOCKS (block), |
500 | BLOCK_SUBBLOCKS (level->chain->block)); | |
a1ab4c31 AC |
501 | BLOCK_CHAIN (block) = free_block_chain; |
502 | free_block_chain = block; | |
503 | } | |
504 | else | |
505 | { | |
506 | BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (level->chain->block); | |
507 | BLOCK_SUBBLOCKS (level->chain->block) = block; | |
508 | TREE_USED (block) = 1; | |
509 | set_block_for_group (block); | |
510 | } | |
511 | ||
512 | /* Free this binding structure. */ | |
513 | current_binding_level = level->chain; | |
514 | level->chain = free_binding_level; | |
515 | free_binding_level = level; | |
516 | } | |
517 | ||
2231f17f EB |
518 | /* Exit a binding level and discard the associated BLOCK. */ |
519 | ||
520 | void | |
521 | gnat_zaplevel (void) | |
522 | { | |
523 | struct gnat_binding_level *level = current_binding_level; | |
524 | tree block = level->block; | |
525 | ||
526 | BLOCK_CHAIN (block) = free_block_chain; | |
527 | free_block_chain = block; | |
528 | ||
529 | /* Free this binding structure. */ | |
530 | current_binding_level = level->chain; | |
531 | level->chain = free_binding_level; | |
532 | free_binding_level = level; | |
533 | } | |
a1ab4c31 | 534 | \f |
228ee426 EB |
535 | /* Record DECL as belonging to the current lexical scope and use GNAT_NODE |
536 | for location information and flag propagation. */ | |
a1ab4c31 AC |
537 | |
538 | void | |
539 | gnat_pushdecl (tree decl, Node_Id gnat_node) | |
540 | { | |
228ee426 | 541 | /* If DECL is public external or at top level, it has global context. */ |
bd9c7fb9 | 542 | if ((TREE_PUBLIC (decl) && DECL_EXTERNAL (decl)) || global_bindings_p ()) |
228ee426 EB |
543 | { |
544 | if (!global_context) | |
545 | global_context = build_translation_unit_decl (NULL_TREE); | |
546 | DECL_CONTEXT (decl) = global_context; | |
547 | } | |
a1ab4c31 AC |
548 | else |
549 | { | |
550 | DECL_CONTEXT (decl) = current_function_decl; | |
551 | ||
9f62cb92 JJ |
552 | /* Functions imported in another function are not really nested. |
553 | For really nested functions mark them initially as needing | |
554 | a static chain for uses of that flag before unnesting; | |
555 | lower_nested_functions will then recompute it. */ | |
556 | if (TREE_CODE (decl) == FUNCTION_DECL && !TREE_PUBLIC (decl)) | |
557 | DECL_STATIC_CHAIN (decl) = 1; | |
a1ab4c31 AC |
558 | } |
559 | ||
228ee426 | 560 | TREE_NO_WARNING (decl) = (No (gnat_node) || Warnings_Off (gnat_node)); |
a1ab4c31 AC |
561 | |
562 | /* Set the location of DECL and emit a declaration for it. */ | |
563 | if (Present (gnat_node)) | |
564 | Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (decl)); | |
228ee426 | 565 | |
a1ab4c31 AC |
566 | add_decl_expr (decl, gnat_node); |
567 | ||
568 | /* Put the declaration on the list. The list of declarations is in reverse | |
2231f17f EB |
569 | order. The list will be reversed later. Put global declarations in the |
570 | globals list and local ones in the current block. But skip TYPE_DECLs | |
571 | for UNCONSTRAINED_ARRAY_TYPE in both cases, as they will cause trouble | |
572 | with the debugger and aren't needed anyway. */ | |
573 | if (!(TREE_CODE (decl) == TYPE_DECL | |
574 | && TREE_CODE (TREE_TYPE (decl)) == UNCONSTRAINED_ARRAY_TYPE)) | |
a1ab4c31 | 575 | { |
9083aacd | 576 | if (DECL_EXTERNAL (decl)) |
a1ab4c31 | 577 | { |
a1ab4c31 | 578 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)) |
9771b263 | 579 | vec_safe_push (builtin_decls, decl); |
a1ab4c31 | 580 | } |
9083aacd | 581 | else if (global_bindings_p ()) |
9771b263 | 582 | vec_safe_push (global_decls, decl); |
9083aacd | 583 | else |
a1ab4c31 | 584 | { |
a963da4d EB |
585 | DECL_CHAIN (decl) = BLOCK_VARS (current_binding_level->block); |
586 | BLOCK_VARS (current_binding_level->block) = decl; | |
a1ab4c31 AC |
587 | } |
588 | } | |
589 | ||
590 | /* For the declaration of a type, set its name if it either is not already | |
10069d53 | 591 | set or if the previous type name was not derived from a source name. |
a1ab4c31 AC |
592 | We'd rather have the type named with a real name and all the pointer |
593 | types to the same object have the same POINTER_TYPE node. Code in the | |
594 | equivalent function of c-decl.c makes a copy of the type node here, but | |
595 | that may cause us trouble with incomplete types. We make an exception | |
596 | for fat pointer types because the compiler automatically builds them | |
597 | for unconstrained array types and the debugger uses them to represent | |
598 | both these and pointers to these. */ | |
599 | if (TREE_CODE (decl) == TYPE_DECL && DECL_NAME (decl)) | |
600 | { | |
601 | tree t = TREE_TYPE (decl); | |
602 | ||
10069d53 | 603 | if (!(TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)) |
1aeb40dd | 604 | { |
4cb12a90 | 605 | /* Array and pointer types aren't "tagged" types so we force the |
1aeb40dd EB |
606 | type to be associated with its typedef in the DWARF back-end, |
607 | in order to make sure that the latter is always preserved. */ | |
4cb12a90 EB |
608 | if (!DECL_ARTIFICIAL (decl) |
609 | && (TREE_CODE (t) == ARRAY_TYPE | |
610 | || TREE_CODE (t) == POINTER_TYPE)) | |
1aeb40dd EB |
611 | { |
612 | tree tt = build_distinct_type_copy (t); | |
4cb12a90 EB |
613 | if (TREE_CODE (t) == POINTER_TYPE) |
614 | TYPE_NEXT_PTR_TO (t) = tt; | |
1aeb40dd | 615 | TYPE_NAME (tt) = DECL_NAME (decl); |
d4d05b52 | 616 | TYPE_CONTEXT (tt) = DECL_CONTEXT (decl); |
1aeb40dd EB |
617 | TYPE_STUB_DECL (tt) = TYPE_STUB_DECL (t); |
618 | DECL_ORIGINAL_TYPE (decl) = tt; | |
619 | } | |
620 | } | |
315cff15 | 621 | else if (TYPE_IS_FAT_POINTER_P (t)) |
a1ab4c31 | 622 | { |
e3edbd56 | 623 | /* We need a variant for the placeholder machinery to work. */ |
a1ab4c31 AC |
624 | tree tt = build_variant_type_copy (t); |
625 | TYPE_NAME (tt) = decl; | |
d4d05b52 | 626 | TYPE_CONTEXT (tt) = DECL_CONTEXT (decl); |
a1ab4c31 AC |
627 | TREE_USED (tt) = TREE_USED (t); |
628 | TREE_TYPE (decl) = tt; | |
40c88b94 EB |
629 | if (DECL_ORIGINAL_TYPE (TYPE_NAME (t))) |
630 | DECL_ORIGINAL_TYPE (decl) = DECL_ORIGINAL_TYPE (TYPE_NAME (t)); | |
631 | else | |
632 | DECL_ORIGINAL_TYPE (decl) = t; | |
40c88b94 | 633 | DECL_ARTIFICIAL (decl) = 0; |
e3edbd56 | 634 | t = NULL_TREE; |
a1ab4c31 AC |
635 | } |
636 | else if (DECL_ARTIFICIAL (TYPE_NAME (t)) && !DECL_ARTIFICIAL (decl)) | |
637 | ; | |
638 | else | |
639 | t = NULL_TREE; | |
640 | ||
e3edbd56 EB |
641 | /* Propagate the name to all the anonymous variants. This is needed |
642 | for the type qualifiers machinery to work properly. */ | |
a1ab4c31 AC |
643 | if (t) |
644 | for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t)) | |
e3edbd56 | 645 | if (!(TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)) |
d4d05b52 EB |
646 | { |
647 | TYPE_NAME (t) = decl; | |
648 | TYPE_CONTEXT (t) = DECL_CONTEXT (decl); | |
649 | } | |
a1ab4c31 AC |
650 | } |
651 | } | |
652 | \f | |
842d4ee2 EB |
653 | /* Create a record type that contains a SIZE bytes long field of TYPE with a |
654 | starting bit position so that it is aligned to ALIGN bits, and leaving at | |
655 | least ROOM bytes free before the field. BASE_ALIGN is the alignment the | |
656 | record is guaranteed to get. */ | |
657 | ||
658 | tree | |
659 | make_aligning_type (tree type, unsigned int align, tree size, | |
660 | unsigned int base_align, int room) | |
661 | { | |
662 | /* We will be crafting a record type with one field at a position set to be | |
663 | the next multiple of ALIGN past record'address + room bytes. We use a | |
664 | record placeholder to express record'address. */ | |
665 | tree record_type = make_node (RECORD_TYPE); | |
666 | tree record = build0 (PLACEHOLDER_EXPR, record_type); | |
667 | ||
668 | tree record_addr_st | |
669 | = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record)); | |
670 | ||
671 | /* The diagram below summarizes the shape of what we manipulate: | |
672 | ||
673 | <--------- pos ----------> | |
674 | { +------------+-------------+-----------------+ | |
675 | record =>{ |############| ... | field (type) | | |
676 | { +------------+-------------+-----------------+ | |
677 | |<-- room -->|<- voffset ->|<---- size ----->| | |
678 | o o | |
679 | | | | |
680 | record_addr vblock_addr | |
681 | ||
682 | Every length is in sizetype bytes there, except "pos" which has to be | |
683 | set as a bit position in the GCC tree for the record. */ | |
684 | tree room_st = size_int (room); | |
685 | tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st); | |
686 | tree voffset_st, pos, field; | |
687 | ||
688 | tree name = TYPE_NAME (type); | |
689 | ||
690 | if (TREE_CODE (name) == TYPE_DECL) | |
691 | name = DECL_NAME (name); | |
692 | name = concat_name (name, "ALIGN"); | |
693 | TYPE_NAME (record_type) = name; | |
694 | ||
695 | /* Compute VOFFSET and then POS. The next byte position multiple of some | |
696 | alignment after some address is obtained by "and"ing the alignment minus | |
697 | 1 with the two's complement of the address. */ | |
698 | voffset_st = size_binop (BIT_AND_EXPR, | |
699 | fold_build1 (NEGATE_EXPR, sizetype, vblock_addr_st), | |
700 | size_int ((align / BITS_PER_UNIT) - 1)); | |
701 | ||
702 | /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */ | |
703 | pos = size_binop (MULT_EXPR, | |
704 | convert (bitsizetype, | |
705 | size_binop (PLUS_EXPR, room_st, voffset_st)), | |
706 | bitsize_unit_node); | |
707 | ||
708 | /* Craft the GCC record representation. We exceptionally do everything | |
709 | manually here because 1) our generic circuitry is not quite ready to | |
710 | handle the complex position/size expressions we are setting up, 2) we | |
711 | have a strong simplifying factor at hand: we know the maximum possible | |
712 | value of voffset, and 3) we have to set/reset at least the sizes in | |
713 | accordance with this maximum value anyway, as we need them to convey | |
714 | what should be "alloc"ated for this type. | |
715 | ||
716 | Use -1 as the 'addressable' indication for the field to prevent the | |
717 | creation of a bitfield. We don't need one, it would have damaging | |
718 | consequences on the alignment computation, and create_field_decl would | |
719 | make one without this special argument, for instance because of the | |
720 | complex position expression. */ | |
721 | field = create_field_decl (get_identifier ("F"), type, record_type, size, | |
722 | pos, 1, -1); | |
723 | TYPE_FIELDS (record_type) = field; | |
724 | ||
725 | TYPE_ALIGN (record_type) = base_align; | |
726 | TYPE_USER_ALIGN (record_type) = 1; | |
727 | ||
728 | TYPE_SIZE (record_type) | |
729 | = size_binop (PLUS_EXPR, | |
730 | size_binop (MULT_EXPR, convert (bitsizetype, size), | |
731 | bitsize_unit_node), | |
732 | bitsize_int (align + room * BITS_PER_UNIT)); | |
733 | TYPE_SIZE_UNIT (record_type) | |
734 | = size_binop (PLUS_EXPR, size, | |
735 | size_int (room + align / BITS_PER_UNIT)); | |
736 | ||
737 | SET_TYPE_MODE (record_type, BLKmode); | |
738 | relate_alias_sets (record_type, type, ALIAS_SET_COPY); | |
739 | ||
740 | /* Declare it now since it will never be declared otherwise. This is | |
741 | necessary to ensure that its subtrees are properly marked. */ | |
742 | create_type_decl (name, record_type, NULL, true, false, Empty); | |
743 | ||
744 | return record_type; | |
745 | } | |
746 | ||
747 | /* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used | |
748 | as the field type of a packed record if IN_RECORD is true, or as the | |
749 | component type of a packed array if IN_RECORD is false. See if we can | |
750 | rewrite it either as a type that has a non-BLKmode, which we can pack | |
751 | tighter in the packed record case, or as a smaller type. If so, return | |
752 | the new type. If not, return the original type. */ | |
753 | ||
754 | tree | |
755 | make_packable_type (tree type, bool in_record) | |
756 | { | |
757 | unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1); | |
758 | unsigned HOST_WIDE_INT new_size; | |
759 | tree new_type, old_field, field_list = NULL_TREE; | |
760 | unsigned int align; | |
761 | ||
762 | /* No point in doing anything if the size is zero. */ | |
763 | if (size == 0) | |
764 | return type; | |
765 | ||
766 | new_type = make_node (TREE_CODE (type)); | |
767 | ||
768 | /* Copy the name and flags from the old type to that of the new. | |
769 | Note that we rely on the pointer equality created here for | |
770 | TYPE_NAME to look through conversions in various places. */ | |
771 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
772 | TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type); | |
773 | TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type); | |
774 | if (TREE_CODE (type) == RECORD_TYPE) | |
775 | TYPE_PADDING_P (new_type) = TYPE_PADDING_P (type); | |
776 | ||
777 | /* If we are in a record and have a small size, set the alignment to | |
778 | try for an integral mode. Otherwise set it to try for a smaller | |
779 | type with BLKmode. */ | |
780 | if (in_record && size <= MAX_FIXED_MODE_SIZE) | |
781 | { | |
782 | align = ceil_pow2 (size); | |
783 | TYPE_ALIGN (new_type) = align; | |
784 | new_size = (size + align - 1) & -align; | |
785 | } | |
786 | else | |
787 | { | |
788 | unsigned HOST_WIDE_INT align; | |
789 | ||
790 | /* Do not try to shrink the size if the RM size is not constant. */ | |
791 | if (TYPE_CONTAINS_TEMPLATE_P (type) | |
792 | || !host_integerp (TYPE_ADA_SIZE (type), 1)) | |
793 | return type; | |
794 | ||
795 | /* Round the RM size up to a unit boundary to get the minimal size | |
796 | for a BLKmode record. Give up if it's already the size. */ | |
797 | new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type)); | |
798 | new_size = (new_size + BITS_PER_UNIT - 1) & -BITS_PER_UNIT; | |
799 | if (new_size == size) | |
800 | return type; | |
801 | ||
802 | align = new_size & -new_size; | |
803 | TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align); | |
804 | } | |
805 | ||
806 | TYPE_USER_ALIGN (new_type) = 1; | |
807 | ||
808 | /* Now copy the fields, keeping the position and size as we don't want | |
809 | to change the layout by propagating the packedness downwards. */ | |
810 | for (old_field = TYPE_FIELDS (type); old_field; | |
811 | old_field = DECL_CHAIN (old_field)) | |
812 | { | |
813 | tree new_field_type = TREE_TYPE (old_field); | |
814 | tree new_field, new_size; | |
815 | ||
816 | if (RECORD_OR_UNION_TYPE_P (new_field_type) | |
817 | && !TYPE_FAT_POINTER_P (new_field_type) | |
818 | && host_integerp (TYPE_SIZE (new_field_type), 1)) | |
819 | new_field_type = make_packable_type (new_field_type, true); | |
820 | ||
821 | /* However, for the last field in a not already packed record type | |
822 | that is of an aggregate type, we need to use the RM size in the | |
823 | packable version of the record type, see finish_record_type. */ | |
824 | if (!DECL_CHAIN (old_field) | |
825 | && !TYPE_PACKED (type) | |
826 | && RECORD_OR_UNION_TYPE_P (new_field_type) | |
827 | && !TYPE_FAT_POINTER_P (new_field_type) | |
828 | && !TYPE_CONTAINS_TEMPLATE_P (new_field_type) | |
829 | && TYPE_ADA_SIZE (new_field_type)) | |
830 | new_size = TYPE_ADA_SIZE (new_field_type); | |
831 | else | |
832 | new_size = DECL_SIZE (old_field); | |
833 | ||
834 | new_field | |
835 | = create_field_decl (DECL_NAME (old_field), new_field_type, new_type, | |
836 | new_size, bit_position (old_field), | |
837 | TYPE_PACKED (type), | |
838 | !DECL_NONADDRESSABLE_P (old_field)); | |
839 | ||
840 | DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); | |
841 | SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field); | |
842 | if (TREE_CODE (new_type) == QUAL_UNION_TYPE) | |
843 | DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field); | |
844 | ||
845 | DECL_CHAIN (new_field) = field_list; | |
846 | field_list = new_field; | |
847 | } | |
848 | ||
849 | finish_record_type (new_type, nreverse (field_list), 2, false); | |
850 | relate_alias_sets (new_type, type, ALIAS_SET_COPY); | |
851 | SET_DECL_PARALLEL_TYPE (TYPE_STUB_DECL (new_type), | |
852 | DECL_PARALLEL_TYPE (TYPE_STUB_DECL (type))); | |
853 | ||
854 | /* If this is a padding record, we never want to make the size smaller | |
855 | than what was specified. For QUAL_UNION_TYPE, also copy the size. */ | |
856 | if (TYPE_IS_PADDING_P (type) || TREE_CODE (type) == QUAL_UNION_TYPE) | |
857 | { | |
858 | TYPE_SIZE (new_type) = TYPE_SIZE (type); | |
859 | TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type); | |
860 | new_size = size; | |
861 | } | |
862 | else | |
863 | { | |
864 | TYPE_SIZE (new_type) = bitsize_int (new_size); | |
865 | TYPE_SIZE_UNIT (new_type) | |
866 | = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT); | |
867 | } | |
868 | ||
869 | if (!TYPE_CONTAINS_TEMPLATE_P (type)) | |
870 | SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type)); | |
871 | ||
872 | compute_record_mode (new_type); | |
873 | ||
874 | /* Try harder to get a packable type if necessary, for example | |
875 | in case the record itself contains a BLKmode field. */ | |
876 | if (in_record && TYPE_MODE (new_type) == BLKmode) | |
877 | SET_TYPE_MODE (new_type, | |
878 | mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1)); | |
879 | ||
880 | /* If neither the mode nor the size has shrunk, return the old type. */ | |
881 | if (TYPE_MODE (new_type) == BLKmode && new_size >= size) | |
882 | return type; | |
883 | ||
884 | return new_type; | |
885 | } | |
886 | ||
887 | /* Given a type TYPE, return a new type whose size is appropriate for SIZE. | |
888 | If TYPE is the best type, return it. Otherwise, make a new type. We | |
889 | only support new integral and pointer types. FOR_BIASED is true if | |
890 | we are making a biased type. */ | |
891 | ||
892 | tree | |
893 | make_type_from_size (tree type, tree size_tree, bool for_biased) | |
894 | { | |
895 | unsigned HOST_WIDE_INT size; | |
896 | bool biased_p; | |
897 | tree new_type; | |
898 | ||
899 | /* If size indicates an error, just return TYPE to avoid propagating | |
900 | the error. Likewise if it's too large to represent. */ | |
901 | if (!size_tree || !host_integerp (size_tree, 1)) | |
902 | return type; | |
903 | ||
904 | size = tree_low_cst (size_tree, 1); | |
905 | ||
906 | switch (TREE_CODE (type)) | |
907 | { | |
908 | case INTEGER_TYPE: | |
909 | case ENUMERAL_TYPE: | |
910 | case BOOLEAN_TYPE: | |
911 | biased_p = (TREE_CODE (type) == INTEGER_TYPE | |
912 | && TYPE_BIASED_REPRESENTATION_P (type)); | |
913 | ||
914 | /* Integer types with precision 0 are forbidden. */ | |
915 | if (size == 0) | |
916 | size = 1; | |
917 | ||
918 | /* Only do something if the type isn't a packed array type and doesn't | |
919 | already have the proper size and the size isn't too large. */ | |
920 | if (TYPE_IS_PACKED_ARRAY_TYPE_P (type) | |
921 | || (TYPE_PRECISION (type) == size && biased_p == for_biased) | |
922 | || size > LONG_LONG_TYPE_SIZE) | |
923 | break; | |
924 | ||
925 | biased_p |= for_biased; | |
926 | if (TYPE_UNSIGNED (type) || biased_p) | |
927 | new_type = make_unsigned_type (size); | |
928 | else | |
929 | new_type = make_signed_type (size); | |
930 | TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type; | |
931 | SET_TYPE_RM_MIN_VALUE (new_type, | |
932 | convert (TREE_TYPE (new_type), | |
933 | TYPE_MIN_VALUE (type))); | |
934 | SET_TYPE_RM_MAX_VALUE (new_type, | |
935 | convert (TREE_TYPE (new_type), | |
936 | TYPE_MAX_VALUE (type))); | |
937 | /* Copy the name to show that it's essentially the same type and | |
938 | not a subrange type. */ | |
939 | TYPE_NAME (new_type) = TYPE_NAME (type); | |
940 | TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p; | |
941 | SET_TYPE_RM_SIZE (new_type, bitsize_int (size)); | |
942 | return new_type; | |
943 | ||
944 | case RECORD_TYPE: | |
945 | /* Do something if this is a fat pointer, in which case we | |
946 | may need to return the thin pointer. */ | |
947 | if (TYPE_FAT_POINTER_P (type) && size < POINTER_SIZE * 2) | |
948 | { | |
949 | enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0); | |
950 | if (!targetm.valid_pointer_mode (p_mode)) | |
951 | p_mode = ptr_mode; | |
952 | return | |
953 | build_pointer_type_for_mode | |
954 | (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)), | |
955 | p_mode, 0); | |
956 | } | |
957 | break; | |
958 | ||
959 | case POINTER_TYPE: | |
960 | /* Only do something if this is a thin pointer, in which case we | |
961 | may need to return the fat pointer. */ | |
962 | if (TYPE_IS_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2) | |
963 | return | |
964 | build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))); | |
965 | break; | |
966 | ||
967 | default: | |
968 | break; | |
969 | } | |
970 | ||
971 | return type; | |
972 | } | |
973 | ||
974 | /* See if the data pointed to by the hash table slot is marked. */ | |
975 | ||
976 | static int | |
977 | pad_type_hash_marked_p (const void *p) | |
978 | { | |
979 | const_tree const type = ((const struct pad_type_hash *) p)->type; | |
980 | ||
981 | return ggc_marked_p (type); | |
982 | } | |
983 | ||
984 | /* Return the cached hash value. */ | |
985 | ||
986 | static hashval_t | |
987 | pad_type_hash_hash (const void *p) | |
988 | { | |
989 | return ((const struct pad_type_hash *) p)->hash; | |
990 | } | |
991 | ||
992 | /* Return 1 iff the padded types are equivalent. */ | |
993 | ||
994 | static int | |
995 | pad_type_hash_eq (const void *p1, const void *p2) | |
996 | { | |
997 | const struct pad_type_hash *const t1 = (const struct pad_type_hash *) p1; | |
998 | const struct pad_type_hash *const t2 = (const struct pad_type_hash *) p2; | |
999 | tree type1, type2; | |
1000 | ||
1001 | if (t1->hash != t2->hash) | |
1002 | return 0; | |
1003 | ||
1004 | type1 = t1->type; | |
1005 | type2 = t2->type; | |
1006 | ||
1007 | /* We consider that the padded types are equivalent if they pad the same | |
1008 | type and have the same size, alignment and RM size. Taking the mode | |
1009 | into account is redundant since it is determined by the others. */ | |
1010 | return | |
1011 | TREE_TYPE (TYPE_FIELDS (type1)) == TREE_TYPE (TYPE_FIELDS (type2)) | |
1012 | && TYPE_SIZE (type1) == TYPE_SIZE (type2) | |
1013 | && TYPE_ALIGN (type1) == TYPE_ALIGN (type2) | |
1014 | && TYPE_ADA_SIZE (type1) == TYPE_ADA_SIZE (type2); | |
1015 | } | |
1016 | ||
1017 | /* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type | |
1018 | if needed. We have already verified that SIZE and TYPE are large enough. | |
1019 | GNAT_ENTITY is used to name the resulting record and to issue a warning. | |
1020 | IS_COMPONENT_TYPE is true if this is being done for the component type of | |
1021 | an array. IS_USER_TYPE is true if the original type needs to be completed. | |
1022 | DEFINITION is true if this type is being defined. SET_RM_SIZE is true if | |
1023 | the RM size of the resulting type is to be set to SIZE too. */ | |
1024 | ||
1025 | tree | |
1026 | maybe_pad_type (tree type, tree size, unsigned int align, | |
1027 | Entity_Id gnat_entity, bool is_component_type, | |
1028 | bool is_user_type, bool definition, bool set_rm_size) | |
1029 | { | |
1030 | tree orig_size = TYPE_SIZE (type); | |
1031 | tree record, field; | |
1032 | ||
1033 | /* If TYPE is a padded type, see if it agrees with any size and alignment | |
1034 | we were given. If so, return the original type. Otherwise, strip | |
1035 | off the padding, since we will either be returning the inner type | |
1036 | or repadding it. If no size or alignment is specified, use that of | |
1037 | the original padded type. */ | |
1038 | if (TYPE_IS_PADDING_P (type)) | |
1039 | { | |
1040 | if ((!size | |
1041 | || operand_equal_p (round_up (size, | |
1042 | MAX (align, TYPE_ALIGN (type))), | |
1043 | round_up (TYPE_SIZE (type), | |
1044 | MAX (align, TYPE_ALIGN (type))), | |
1045 | 0)) | |
1046 | && (align == 0 || align == TYPE_ALIGN (type))) | |
1047 | return type; | |
1048 | ||
1049 | if (!size) | |
1050 | size = TYPE_SIZE (type); | |
1051 | if (align == 0) | |
1052 | align = TYPE_ALIGN (type); | |
1053 | ||
1054 | type = TREE_TYPE (TYPE_FIELDS (type)); | |
1055 | orig_size = TYPE_SIZE (type); | |
1056 | } | |
1057 | ||
1058 | /* If the size is either not being changed or is being made smaller (which | |
1059 | is not done here and is only valid for bitfields anyway), show the size | |
1060 | isn't changing. Likewise, clear the alignment if it isn't being | |
1061 | changed. Then return if we aren't doing anything. */ | |
1062 | if (size | |
1063 | && (operand_equal_p (size, orig_size, 0) | |
1064 | || (TREE_CODE (orig_size) == INTEGER_CST | |
1065 | && tree_int_cst_lt (size, orig_size)))) | |
1066 | size = NULL_TREE; | |
1067 | ||
1068 | if (align == TYPE_ALIGN (type)) | |
1069 | align = 0; | |
1070 | ||
1071 | if (align == 0 && !size) | |
1072 | return type; | |
1073 | ||
1074 | /* If requested, complete the original type and give it a name. */ | |
1075 | if (is_user_type) | |
1076 | create_type_decl (get_entity_name (gnat_entity), type, | |
1077 | NULL, !Comes_From_Source (gnat_entity), | |
1078 | !(TYPE_NAME (type) | |
1079 | && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
1080 | && DECL_IGNORED_P (TYPE_NAME (type))), | |
1081 | gnat_entity); | |
1082 | ||
1083 | /* We used to modify the record in place in some cases, but that could | |
1084 | generate incorrect debugging information. So make a new record | |
1085 | type and name. */ | |
1086 | record = make_node (RECORD_TYPE); | |
1087 | TYPE_PADDING_P (record) = 1; | |
1088 | ||
1089 | if (Present (gnat_entity)) | |
1090 | TYPE_NAME (record) = create_concat_name (gnat_entity, "PAD"); | |
1091 | ||
1092 | TYPE_ALIGN (record) = align; | |
1093 | TYPE_SIZE (record) = size ? size : orig_size; | |
1094 | TYPE_SIZE_UNIT (record) | |
1095 | = convert (sizetype, | |
1096 | size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record), | |
1097 | bitsize_unit_node)); | |
1098 | ||
1099 | /* If we are changing the alignment and the input type is a record with | |
1100 | BLKmode and a small constant size, try to make a form that has an | |
1101 | integral mode. This might allow the padding record to also have an | |
1102 | integral mode, which will be much more efficient. There is no point | |
1103 | in doing so if a size is specified unless it is also a small constant | |
1104 | size and it is incorrect to do so if we cannot guarantee that the mode | |
1105 | will be naturally aligned since the field must always be addressable. | |
1106 | ||
1107 | ??? This might not always be a win when done for a stand-alone object: | |
1108 | since the nominal and the effective type of the object will now have | |
1109 | different modes, a VIEW_CONVERT_EXPR will be required for converting | |
1110 | between them and it might be hard to overcome afterwards, including | |
1111 | at the RTL level when the stand-alone object is accessed as a whole. */ | |
1112 | if (align != 0 | |
1113 | && RECORD_OR_UNION_TYPE_P (type) | |
1114 | && TYPE_MODE (type) == BLKmode | |
1115 | && !TYPE_BY_REFERENCE_P (type) | |
1116 | && TREE_CODE (orig_size) == INTEGER_CST | |
1117 | && !TREE_OVERFLOW (orig_size) | |
1118 | && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0 | |
1119 | && (!size | |
1120 | || (TREE_CODE (size) == INTEGER_CST | |
1121 | && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0))) | |
1122 | { | |
1123 | tree packable_type = make_packable_type (type, true); | |
1124 | if (TYPE_MODE (packable_type) != BLKmode | |
1125 | && align >= TYPE_ALIGN (packable_type)) | |
1126 | type = packable_type; | |
1127 | } | |
1128 | ||
1129 | /* Now create the field with the original size. */ | |
1130 | field = create_field_decl (get_identifier ("F"), type, record, orig_size, | |
1131 | bitsize_zero_node, 0, 1); | |
1132 | DECL_INTERNAL_P (field) = 1; | |
1133 | ||
1134 | /* Do not emit debug info until after the auxiliary record is built. */ | |
1135 | finish_record_type (record, field, 1, false); | |
1136 | ||
1137 | /* Set the RM size if requested. */ | |
1138 | if (set_rm_size) | |
1139 | { | |
1140 | SET_TYPE_ADA_SIZE (record, size ? size : orig_size); | |
1141 | ||
1142 | /* If the padded type is complete and has constant size, we canonicalize | |
1143 | it by means of the hash table. This is consistent with the language | |
1144 | semantics and ensures that gigi and the middle-end have a common view | |
1145 | of these padded types. */ | |
1146 | if (TREE_CONSTANT (TYPE_SIZE (record))) | |
1147 | { | |
1148 | hashval_t hashcode; | |
1149 | struct pad_type_hash in, *h; | |
1150 | void **loc; | |
1151 | ||
1152 | hashcode = iterative_hash_object (TYPE_HASH (type), 0); | |
1153 | hashcode = iterative_hash_expr (TYPE_SIZE (record), hashcode); | |
1154 | hashcode = iterative_hash_hashval_t (TYPE_ALIGN (record), hashcode); | |
1155 | hashcode = iterative_hash_expr (TYPE_ADA_SIZE (record), hashcode); | |
1156 | ||
1157 | in.hash = hashcode; | |
1158 | in.type = record; | |
1159 | h = (struct pad_type_hash *) | |
1160 | htab_find_with_hash (pad_type_hash_table, &in, hashcode); | |
1161 | if (h) | |
1162 | { | |
1163 | record = h->type; | |
1164 | goto built; | |
1165 | } | |
1166 | ||
1167 | h = ggc_alloc_pad_type_hash (); | |
1168 | h->hash = hashcode; | |
1169 | h->type = record; | |
1170 | loc = htab_find_slot_with_hash (pad_type_hash_table, h, hashcode, | |
1171 | INSERT); | |
1172 | *loc = (void *)h; | |
1173 | } | |
1174 | } | |
1175 | ||
1176 | /* Unless debugging information isn't being written for the input type, | |
1177 | write a record that shows what we are a subtype of and also make a | |
1178 | variable that indicates our size, if still variable. */ | |
1179 | if (TREE_CODE (orig_size) != INTEGER_CST | |
1180 | && TYPE_NAME (record) | |
1181 | && TYPE_NAME (type) | |
1182 | && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL | |
1183 | && DECL_IGNORED_P (TYPE_NAME (type)))) | |
1184 | { | |
1185 | tree marker = make_node (RECORD_TYPE); | |
1186 | tree name = TYPE_NAME (record); | |
1187 | tree orig_name = TYPE_NAME (type); | |
1188 | ||
1189 | if (TREE_CODE (name) == TYPE_DECL) | |
1190 | name = DECL_NAME (name); | |
1191 | ||
1192 | if (TREE_CODE (orig_name) == TYPE_DECL) | |
1193 | orig_name = DECL_NAME (orig_name); | |
1194 | ||
1195 | TYPE_NAME (marker) = concat_name (name, "XVS"); | |
1196 | finish_record_type (marker, | |
1197 | create_field_decl (orig_name, | |
1198 | build_reference_type (type), | |
1199 | marker, NULL_TREE, NULL_TREE, | |
1200 | 0, 0), | |
1201 | 0, true); | |
1202 | ||
1203 | add_parallel_type (record, marker); | |
1204 | ||
1205 | if (definition && size && TREE_CODE (size) != INTEGER_CST) | |
1206 | TYPE_SIZE_UNIT (marker) | |
1207 | = create_var_decl (concat_name (name, "XVZ"), NULL_TREE, sizetype, | |
1208 | TYPE_SIZE_UNIT (record), false, false, false, | |
1209 | false, NULL, gnat_entity); | |
1210 | } | |
1211 | ||
1212 | rest_of_record_type_compilation (record); | |
1213 | ||
1214 | built: | |
1215 | /* If the size was widened explicitly, maybe give a warning. Take the | |
1216 | original size as the maximum size of the input if there was an | |
1217 | unconstrained record involved and round it up to the specified alignment, | |
1218 | if one was specified. But don't do it if we are just annotating types | |
1219 | and the type is tagged, since tagged types aren't fully laid out in this | |
1220 | mode. */ | |
1221 | if (!size | |
1222 | || TREE_CODE (size) == COND_EXPR | |
1223 | || TREE_CODE (size) == MAX_EXPR | |
1224 | || No (gnat_entity) | |
1225 | || (type_annotate_only && Is_Tagged_Type (Etype (gnat_entity)))) | |
1226 | return record; | |
1227 | ||
1228 | if (CONTAINS_PLACEHOLDER_P (orig_size)) | |
1229 | orig_size = max_size (orig_size, true); | |
1230 | ||
1231 | if (align) | |
1232 | orig_size = round_up (orig_size, align); | |
1233 | ||
1234 | if (!operand_equal_p (size, orig_size, 0) | |
1235 | && !(TREE_CODE (size) == INTEGER_CST | |
1236 | && TREE_CODE (orig_size) == INTEGER_CST | |
1237 | && (TREE_OVERFLOW (size) | |
1238 | || TREE_OVERFLOW (orig_size) | |
1239 | || tree_int_cst_lt (size, orig_size)))) | |
1240 | { | |
1241 | Node_Id gnat_error_node = Empty; | |
1242 | ||
1243 | if (Is_Packed_Array_Type (gnat_entity)) | |
1244 | gnat_entity = Original_Array_Type (gnat_entity); | |
1245 | ||
1246 | if ((Ekind (gnat_entity) == E_Component | |
1247 | || Ekind (gnat_entity) == E_Discriminant) | |
1248 | && Present (Component_Clause (gnat_entity))) | |
1249 | gnat_error_node = Last_Bit (Component_Clause (gnat_entity)); | |
1250 | else if (Present (Size_Clause (gnat_entity))) | |
1251 | gnat_error_node = Expression (Size_Clause (gnat_entity)); | |
1252 | ||
1253 | /* Generate message only for entities that come from source, since | |
1254 | if we have an entity created by expansion, the message will be | |
1255 | generated for some other corresponding source entity. */ | |
1256 | if (Comes_From_Source (gnat_entity)) | |
1257 | { | |
1258 | if (Present (gnat_error_node)) | |
1259 | post_error_ne_tree ("{^ }bits of & unused?", | |
1260 | gnat_error_node, gnat_entity, | |
1261 | size_diffop (size, orig_size)); | |
1262 | else if (is_component_type) | |
1263 | post_error_ne_tree ("component of& padded{ by ^ bits}?", | |
1264 | gnat_entity, gnat_entity, | |
1265 | size_diffop (size, orig_size)); | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | return record; | |
1270 | } | |
1271 | \f | |
1272 | /* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP. | |
1273 | If this is a multi-dimensional array type, do this recursively. | |
1274 | ||
1275 | OP may be | |
1276 | - ALIAS_SET_COPY: the new set is made a copy of the old one. | |
1277 | - ALIAS_SET_SUPERSET: the new set is made a superset of the old one. | |
1278 | - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */ | |
1279 | ||
1280 | void | |
1281 | relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op) | |
1282 | { | |
1283 | /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case | |
1284 | of a one-dimensional array, since the padding has the same alias set | |
1285 | as the field type, but if it's a multi-dimensional array, we need to | |
1286 | see the inner types. */ | |
1287 | while (TREE_CODE (gnu_old_type) == RECORD_TYPE | |
1288 | && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type) | |
1289 | || TYPE_PADDING_P (gnu_old_type))) | |
1290 | gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type)); | |
1291 | ||
1292 | /* Unconstrained array types are deemed incomplete and would thus be given | |
1293 | alias set 0. Retrieve the underlying array type. */ | |
1294 | if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE) | |
1295 | gnu_old_type | |
1296 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type)))); | |
1297 | if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE) | |
1298 | gnu_new_type | |
1299 | = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type)))); | |
1300 | ||
1301 | if (TREE_CODE (gnu_new_type) == ARRAY_TYPE | |
1302 | && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE | |
1303 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type))) | |
1304 | relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op); | |
1305 | ||
1306 | switch (op) | |
1307 | { | |
1308 | case ALIAS_SET_COPY: | |
1309 | /* The alias set shouldn't be copied between array types with different | |
1310 | aliasing settings because this can break the aliasing relationship | |
1311 | between the array type and its element type. */ | |
1312 | #ifndef ENABLE_CHECKING | |
1313 | if (flag_strict_aliasing) | |
1314 | #endif | |
1315 | gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE | |
1316 | && TREE_CODE (gnu_old_type) == ARRAY_TYPE | |
1317 | && TYPE_NONALIASED_COMPONENT (gnu_new_type) | |
1318 | != TYPE_NONALIASED_COMPONENT (gnu_old_type))); | |
1319 | ||
1320 | TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type); | |
1321 | break; | |
1322 | ||
1323 | case ALIAS_SET_SUBSET: | |
1324 | case ALIAS_SET_SUPERSET: | |
1325 | { | |
1326 | alias_set_type old_set = get_alias_set (gnu_old_type); | |
1327 | alias_set_type new_set = get_alias_set (gnu_new_type); | |
1328 | ||
1329 | /* Do nothing if the alias sets conflict. This ensures that we | |
1330 | never call record_alias_subset several times for the same pair | |
1331 | or at all for alias set 0. */ | |
1332 | if (!alias_sets_conflict_p (old_set, new_set)) | |
1333 | { | |
1334 | if (op == ALIAS_SET_SUBSET) | |
1335 | record_alias_subset (old_set, new_set); | |
1336 | else | |
1337 | record_alias_subset (new_set, old_set); | |
1338 | } | |
1339 | } | |
1340 | break; | |
1341 | ||
1342 | default: | |
1343 | gcc_unreachable (); | |
1344 | } | |
1345 | ||
1346 | record_component_aliases (gnu_new_type); | |
1347 | } | |
1348 | \f | |
1aeb40dd EB |
1349 | /* Record TYPE as a builtin type for Ada. NAME is the name of the type. |
1350 | ARTIFICIAL_P is true if it's a type that was generated by the compiler. */ | |
a1ab4c31 AC |
1351 | |
1352 | void | |
1aeb40dd | 1353 | record_builtin_type (const char *name, tree type, bool artificial_p) |
a1ab4c31 | 1354 | { |
c172df28 AH |
1355 | tree type_decl = build_decl (input_location, |
1356 | TYPE_DECL, get_identifier (name), type); | |
1aeb40dd | 1357 | DECL_ARTIFICIAL (type_decl) = artificial_p; |
bc712852 | 1358 | TYPE_ARTIFICIAL (type) = artificial_p; |
10069d53 | 1359 | gnat_pushdecl (type_decl, Empty); |
a1ab4c31 | 1360 | |
10069d53 EB |
1361 | if (debug_hooks->type_decl) |
1362 | debug_hooks->type_decl (type_decl, false); | |
a1ab4c31 AC |
1363 | } |
1364 | \f | |
e3edbd56 EB |
1365 | /* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST, |
1366 | finish constructing the record type as a fat pointer type. */ | |
1367 | ||
1368 | void | |
1369 | finish_fat_pointer_type (tree record_type, tree field_list) | |
1370 | { | |
1371 | /* Make sure we can put it into a register. */ | |
5da8c011 EB |
1372 | if (STRICT_ALIGNMENT) |
1373 | TYPE_ALIGN (record_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE); | |
e3edbd56 EB |
1374 | |
1375 | /* Show what it really is. */ | |
1376 | TYPE_FAT_POINTER_P (record_type) = 1; | |
1377 | ||
1378 | /* Do not emit debug info for it since the types of its fields may still be | |
1379 | incomplete at this point. */ | |
1380 | finish_record_type (record_type, field_list, 0, false); | |
1381 | ||
1382 | /* Force type_contains_placeholder_p to return true on it. Although the | |
1383 | PLACEHOLDER_EXPRs are referenced only indirectly, this isn't a pointer | |
1384 | type but the representation of the unconstrained array. */ | |
1385 | TYPE_CONTAINS_PLACEHOLDER_INTERNAL (record_type) = 2; | |
1386 | } | |
1387 | ||
032d1b71 | 1388 | /* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST, |
a1ab4c31 AC |
1389 | finish constructing the record or union type. If REP_LEVEL is zero, this |
1390 | record has no representation clause and so will be entirely laid out here. | |
1391 | If REP_LEVEL is one, this record has a representation clause and has been | |
1392 | laid out already; only set the sizes and alignment. If REP_LEVEL is two, | |
1393 | this record is derived from a parent record and thus inherits its layout; | |
032d1b71 EB |
1394 | only make a pass on the fields to finalize them. DEBUG_INFO_P is true if |
1395 | we need to write debug information about this type. */ | |
a1ab4c31 AC |
1396 | |
1397 | void | |
032d1b71 EB |
1398 | finish_record_type (tree record_type, tree field_list, int rep_level, |
1399 | bool debug_info_p) | |
a1ab4c31 AC |
1400 | { |
1401 | enum tree_code code = TREE_CODE (record_type); | |
1402 | tree name = TYPE_NAME (record_type); | |
1403 | tree ada_size = bitsize_zero_node; | |
1404 | tree size = bitsize_zero_node; | |
1405 | bool had_size = TYPE_SIZE (record_type) != 0; | |
1406 | bool had_size_unit = TYPE_SIZE_UNIT (record_type) != 0; | |
1407 | bool had_align = TYPE_ALIGN (record_type) != 0; | |
1408 | tree field; | |
1409 | ||
032d1b71 | 1410 | TYPE_FIELDS (record_type) = field_list; |
a1ab4c31 | 1411 | |
10069d53 EB |
1412 | /* Always attach the TYPE_STUB_DECL for a record type. It is required to |
1413 | generate debug info and have a parallel type. */ | |
1414 | if (name && TREE_CODE (name) == TYPE_DECL) | |
1415 | name = DECL_NAME (name); | |
1416 | TYPE_STUB_DECL (record_type) = create_type_stub_decl (name, record_type); | |
a1ab4c31 AC |
1417 | |
1418 | /* Globally initialize the record first. If this is a rep'ed record, | |
1419 | that just means some initializations; otherwise, layout the record. */ | |
1420 | if (rep_level > 0) | |
1421 | { | |
1422 | TYPE_ALIGN (record_type) = MAX (BITS_PER_UNIT, TYPE_ALIGN (record_type)); | |
a1ab4c31 AC |
1423 | |
1424 | if (!had_size_unit) | |
1425 | TYPE_SIZE_UNIT (record_type) = size_zero_node; | |
b1fa9126 | 1426 | |
a1ab4c31 AC |
1427 | if (!had_size) |
1428 | TYPE_SIZE (record_type) = bitsize_zero_node; | |
1429 | ||
1430 | /* For all-repped records with a size specified, lay the QUAL_UNION_TYPE | |
1431 | out just like a UNION_TYPE, since the size will be fixed. */ | |
1432 | else if (code == QUAL_UNION_TYPE) | |
1433 | code = UNION_TYPE; | |
1434 | } | |
1435 | else | |
1436 | { | |
1437 | /* Ensure there isn't a size already set. There can be in an error | |
1438 | case where there is a rep clause but all fields have errors and | |
1439 | no longer have a position. */ | |
1440 | TYPE_SIZE (record_type) = 0; | |
bb358f1c EB |
1441 | |
1442 | /* Ensure we use the traditional GCC layout for bitfields when we need | |
1443 | to pack the record type or have a representation clause. The other | |
1444 | possible layout (Microsoft C compiler), if available, would prevent | |
1445 | efficient packing in almost all cases. */ | |
1446 | #ifdef TARGET_MS_BITFIELD_LAYOUT | |
1447 | if (TARGET_MS_BITFIELD_LAYOUT && TYPE_PACKED (record_type)) | |
1448 | decl_attributes (&record_type, | |
1449 | tree_cons (get_identifier ("gcc_struct"), | |
1450 | NULL_TREE, NULL_TREE), | |
1451 | ATTR_FLAG_TYPE_IN_PLACE); | |
1452 | #endif | |
1453 | ||
a1ab4c31 AC |
1454 | layout_type (record_type); |
1455 | } | |
1456 | ||
1457 | /* At this point, the position and size of each field is known. It was | |
1458 | either set before entry by a rep clause, or by laying out the type above. | |
1459 | ||
1460 | We now run a pass over the fields (in reverse order for QUAL_UNION_TYPEs) | |
1461 | to compute the Ada size; the GCC size and alignment (for rep'ed records | |
1462 | that are not padding types); and the mode (for rep'ed records). We also | |
1463 | clear the DECL_BIT_FIELD indication for the cases we know have not been | |
1464 | handled yet, and adjust DECL_NONADDRESSABLE_P accordingly. */ | |
1465 | ||
1466 | if (code == QUAL_UNION_TYPE) | |
032d1b71 | 1467 | field_list = nreverse (field_list); |
a1ab4c31 | 1468 | |
910ad8de | 1469 | for (field = field_list; field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
1470 | { |
1471 | tree type = TREE_TYPE (field); | |
1472 | tree pos = bit_position (field); | |
1473 | tree this_size = DECL_SIZE (field); | |
1474 | tree this_ada_size; | |
1475 | ||
e1e5852c | 1476 | if (RECORD_OR_UNION_TYPE_P (type) |
315cff15 | 1477 | && !TYPE_FAT_POINTER_P (type) |
a1ab4c31 AC |
1478 | && !TYPE_CONTAINS_TEMPLATE_P (type) |
1479 | && TYPE_ADA_SIZE (type)) | |
1480 | this_ada_size = TYPE_ADA_SIZE (type); | |
1481 | else | |
1482 | this_ada_size = this_size; | |
1483 | ||
1484 | /* Clear DECL_BIT_FIELD for the cases layout_decl does not handle. */ | |
1485 | if (DECL_BIT_FIELD (field) | |
1486 | && operand_equal_p (this_size, TYPE_SIZE (type), 0)) | |
1487 | { | |
1488 | unsigned int align = TYPE_ALIGN (type); | |
1489 | ||
1490 | /* In the general case, type alignment is required. */ | |
1491 | if (value_factor_p (pos, align)) | |
1492 | { | |
1493 | /* The enclosing record type must be sufficiently aligned. | |
1494 | Otherwise, if no alignment was specified for it and it | |
1495 | has been laid out already, bump its alignment to the | |
1496 | desired one if this is compatible with its size. */ | |
1497 | if (TYPE_ALIGN (record_type) >= align) | |
1498 | { | |
1499 | DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align); | |
1500 | DECL_BIT_FIELD (field) = 0; | |
1501 | } | |
1502 | else if (!had_align | |
1503 | && rep_level == 0 | |
1504 | && value_factor_p (TYPE_SIZE (record_type), align)) | |
1505 | { | |
1506 | TYPE_ALIGN (record_type) = align; | |
1507 | DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align); | |
1508 | DECL_BIT_FIELD (field) = 0; | |
1509 | } | |
1510 | } | |
1511 | ||
1512 | /* In the non-strict alignment case, only byte alignment is. */ | |
1513 | if (!STRICT_ALIGNMENT | |
1514 | && DECL_BIT_FIELD (field) | |
1515 | && value_factor_p (pos, BITS_PER_UNIT)) | |
1516 | DECL_BIT_FIELD (field) = 0; | |
1517 | } | |
1518 | ||
c1abd261 EB |
1519 | /* If we still have DECL_BIT_FIELD set at this point, we know that the |
1520 | field is technically not addressable. Except that it can actually | |
1521 | be addressed if it is BLKmode and happens to be properly aligned. */ | |
1522 | if (DECL_BIT_FIELD (field) | |
1523 | && !(DECL_MODE (field) == BLKmode | |
1524 | && value_factor_p (pos, BITS_PER_UNIT))) | |
1525 | DECL_NONADDRESSABLE_P (field) = 1; | |
a1ab4c31 AC |
1526 | |
1527 | /* A type must be as aligned as its most aligned field that is not | |
1528 | a bit-field. But this is already enforced by layout_type. */ | |
1529 | if (rep_level > 0 && !DECL_BIT_FIELD (field)) | |
1530 | TYPE_ALIGN (record_type) | |
1531 | = MAX (TYPE_ALIGN (record_type), DECL_ALIGN (field)); | |
1532 | ||
1533 | switch (code) | |
1534 | { | |
1535 | case UNION_TYPE: | |
1536 | ada_size = size_binop (MAX_EXPR, ada_size, this_ada_size); | |
1537 | size = size_binop (MAX_EXPR, size, this_size); | |
1538 | break; | |
1539 | ||
1540 | case QUAL_UNION_TYPE: | |
1541 | ada_size | |
1542 | = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field), | |
1543 | this_ada_size, ada_size); | |
1544 | size = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field), | |
1545 | this_size, size); | |
1546 | break; | |
1547 | ||
1548 | case RECORD_TYPE: | |
1549 | /* Since we know here that all fields are sorted in order of | |
1550 | increasing bit position, the size of the record is one | |
1551 | higher than the ending bit of the last field processed | |
1552 | unless we have a rep clause, since in that case we might | |
1553 | have a field outside a QUAL_UNION_TYPE that has a higher ending | |
1554 | position. So use a MAX in that case. Also, if this field is a | |
1555 | QUAL_UNION_TYPE, we need to take into account the previous size in | |
1556 | the case of empty variants. */ | |
1557 | ada_size | |
1558 | = merge_sizes (ada_size, pos, this_ada_size, | |
1559 | TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0); | |
1560 | size | |
1561 | = merge_sizes (size, pos, this_size, | |
1562 | TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0); | |
1563 | break; | |
1564 | ||
1565 | default: | |
1566 | gcc_unreachable (); | |
1567 | } | |
1568 | } | |
1569 | ||
1570 | if (code == QUAL_UNION_TYPE) | |
032d1b71 | 1571 | nreverse (field_list); |
a1ab4c31 AC |
1572 | |
1573 | if (rep_level < 2) | |
1574 | { | |
1575 | /* If this is a padding record, we never want to make the size smaller | |
1576 | than what was specified in it, if any. */ | |
315cff15 | 1577 | if (TYPE_IS_PADDING_P (record_type) && TYPE_SIZE (record_type)) |
a1ab4c31 AC |
1578 | size = TYPE_SIZE (record_type); |
1579 | ||
1580 | /* Now set any of the values we've just computed that apply. */ | |
315cff15 | 1581 | if (!TYPE_FAT_POINTER_P (record_type) |
a1ab4c31 AC |
1582 | && !TYPE_CONTAINS_TEMPLATE_P (record_type)) |
1583 | SET_TYPE_ADA_SIZE (record_type, ada_size); | |
1584 | ||
1585 | if (rep_level > 0) | |
1586 | { | |
1587 | tree size_unit = had_size_unit | |
1588 | ? TYPE_SIZE_UNIT (record_type) | |
1589 | : convert (sizetype, | |
1590 | size_binop (CEIL_DIV_EXPR, size, | |
1591 | bitsize_unit_node)); | |
1592 | unsigned int align = TYPE_ALIGN (record_type); | |
1593 | ||
1594 | TYPE_SIZE (record_type) = variable_size (round_up (size, align)); | |
1595 | TYPE_SIZE_UNIT (record_type) | |
1596 | = variable_size (round_up (size_unit, align / BITS_PER_UNIT)); | |
1597 | ||
1598 | compute_record_mode (record_type); | |
1599 | } | |
1600 | } | |
1601 | ||
032d1b71 | 1602 | if (debug_info_p) |
a1ab4c31 AC |
1603 | rest_of_record_type_compilation (record_type); |
1604 | } | |
1605 | ||
a5695aa2 EB |
1606 | /* Append PARALLEL_TYPE on the chain of parallel types of TYPE. */ |
1607 | ||
1608 | void | |
1609 | add_parallel_type (tree type, tree parallel_type) | |
1610 | { | |
1611 | tree decl = TYPE_STUB_DECL (type); | |
1612 | ||
1613 | while (DECL_PARALLEL_TYPE (decl)) | |
1614 | decl = TYPE_STUB_DECL (DECL_PARALLEL_TYPE (decl)); | |
1615 | ||
1616 | SET_DECL_PARALLEL_TYPE (decl, parallel_type); | |
1617 | } | |
1618 | ||
1619 | /* Return true if TYPE has a parallel type. */ | |
1620 | ||
1621 | static bool | |
1622 | has_parallel_type (tree type) | |
1623 | { | |
1624 | tree decl = TYPE_STUB_DECL (type); | |
1625 | ||
1626 | return DECL_PARALLEL_TYPE (decl) != NULL_TREE; | |
1627 | } | |
1628 | ||
032d1b71 EB |
1629 | /* Wrap up compilation of RECORD_TYPE, i.e. output all the debug information |
1630 | associated with it. It need not be invoked directly in most cases since | |
1631 | finish_record_type takes care of doing so, but this can be necessary if | |
1632 | a parallel type is to be attached to the record type. */ | |
a1ab4c31 AC |
1633 | |
1634 | void | |
1635 | rest_of_record_type_compilation (tree record_type) | |
1636 | { | |
a1ab4c31 | 1637 | bool var_size = false; |
fb88e1dd | 1638 | tree field; |
a1ab4c31 | 1639 | |
fb88e1dd EB |
1640 | /* If this is a padded type, the bulk of the debug info has already been |
1641 | generated for the field's type. */ | |
1642 | if (TYPE_IS_PADDING_P (record_type)) | |
1643 | return; | |
1644 | ||
a5695aa2 EB |
1645 | /* If the type already has a parallel type (XVS type), then we're done. */ |
1646 | if (has_parallel_type (record_type)) | |
1647 | return; | |
1648 | ||
fb88e1dd | 1649 | for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
1650 | { |
1651 | /* We need to make an XVE/XVU record if any field has variable size, | |
1652 | whether or not the record does. For example, if we have a union, | |
1653 | it may be that all fields, rounded up to the alignment, have the | |
1654 | same size, in which case we'll use that size. But the debug | |
1655 | output routines (except Dwarf2) won't be able to output the fields, | |
1656 | so we need to make the special record. */ | |
1657 | if (TREE_CODE (DECL_SIZE (field)) != INTEGER_CST | |
1658 | /* If a field has a non-constant qualifier, the record will have | |
1659 | variable size too. */ | |
fb88e1dd | 1660 | || (TREE_CODE (record_type) == QUAL_UNION_TYPE |
a1ab4c31 AC |
1661 | && TREE_CODE (DECL_QUALIFIER (field)) != INTEGER_CST)) |
1662 | { | |
1663 | var_size = true; | |
1664 | break; | |
1665 | } | |
1666 | } | |
1667 | ||
fb88e1dd EB |
1668 | /* If this record type is of variable size, make a parallel record type that |
1669 | will tell the debugger how the former is laid out (see exp_dbug.ads). */ | |
1670 | if (var_size) | |
a1ab4c31 AC |
1671 | { |
1672 | tree new_record_type | |
1673 | = make_node (TREE_CODE (record_type) == QUAL_UNION_TYPE | |
1674 | ? UNION_TYPE : TREE_CODE (record_type)); | |
0fb2335d | 1675 | tree orig_name = TYPE_NAME (record_type), new_name; |
a1ab4c31 | 1676 | tree last_pos = bitsize_zero_node; |
0fb2335d | 1677 | tree old_field, prev_old_field = NULL_TREE; |
a1ab4c31 | 1678 | |
0fb2335d EB |
1679 | if (TREE_CODE (orig_name) == TYPE_DECL) |
1680 | orig_name = DECL_NAME (orig_name); | |
1681 | ||
1682 | new_name | |
1683 | = concat_name (orig_name, TREE_CODE (record_type) == QUAL_UNION_TYPE | |
1684 | ? "XVU" : "XVE"); | |
1685 | TYPE_NAME (new_record_type) = new_name; | |
a1ab4c31 AC |
1686 | TYPE_ALIGN (new_record_type) = BIGGEST_ALIGNMENT; |
1687 | TYPE_STUB_DECL (new_record_type) | |
0fb2335d | 1688 | = create_type_stub_decl (new_name, new_record_type); |
a1ab4c31 AC |
1689 | DECL_IGNORED_P (TYPE_STUB_DECL (new_record_type)) |
1690 | = DECL_IGNORED_P (TYPE_STUB_DECL (record_type)); | |
1691 | TYPE_SIZE (new_record_type) = size_int (TYPE_ALIGN (record_type)); | |
1692 | TYPE_SIZE_UNIT (new_record_type) | |
1693 | = size_int (TYPE_ALIGN (record_type) / BITS_PER_UNIT); | |
1694 | ||
a1ab4c31 AC |
1695 | /* Now scan all the fields, replacing each field with a new |
1696 | field corresponding to the new encoding. */ | |
1697 | for (old_field = TYPE_FIELDS (record_type); old_field; | |
910ad8de | 1698 | old_field = DECL_CHAIN (old_field)) |
a1ab4c31 AC |
1699 | { |
1700 | tree field_type = TREE_TYPE (old_field); | |
1701 | tree field_name = DECL_NAME (old_field); | |
1702 | tree new_field; | |
1703 | tree curpos = bit_position (old_field); | |
1704 | bool var = false; | |
1705 | unsigned int align = 0; | |
1706 | tree pos; | |
1707 | ||
1708 | /* See how the position was modified from the last position. | |
1709 | ||
1710 | There are two basic cases we support: a value was added | |
1711 | to the last position or the last position was rounded to | |
1712 | a boundary and they something was added. Check for the | |
1713 | first case first. If not, see if there is any evidence | |
1714 | of rounding. If so, round the last position and try | |
1715 | again. | |
1716 | ||
1717 | If this is a union, the position can be taken as zero. */ | |
1718 | ||
1719 | /* Some computations depend on the shape of the position expression, | |
1720 | so strip conversions to make sure it's exposed. */ | |
1721 | curpos = remove_conversions (curpos, true); | |
1722 | ||
1723 | if (TREE_CODE (new_record_type) == UNION_TYPE) | |
1724 | pos = bitsize_zero_node, align = 0; | |
1725 | else | |
1726 | pos = compute_related_constant (curpos, last_pos); | |
1727 | ||
1728 | if (!pos && TREE_CODE (curpos) == MULT_EXPR | |
1729 | && host_integerp (TREE_OPERAND (curpos, 1), 1)) | |
1730 | { | |
1731 | tree offset = TREE_OPERAND (curpos, 0); | |
1732 | align = tree_low_cst (TREE_OPERAND (curpos, 1), 1); | |
1733 | ||
f58e663b EB |
1734 | /* An offset which is a bitwise AND with a mask increases the |
1735 | alignment according to the number of trailing zeros. */ | |
a1ab4c31 AC |
1736 | offset = remove_conversions (offset, true); |
1737 | if (TREE_CODE (offset) == BIT_AND_EXPR | |
f58e663b | 1738 | && TREE_CODE (TREE_OPERAND (offset, 1)) == INTEGER_CST) |
a1ab4c31 | 1739 | { |
f58e663b EB |
1740 | unsigned HOST_WIDE_INT mask |
1741 | = TREE_INT_CST_LOW (TREE_OPERAND (offset, 1)); | |
1742 | unsigned int i; | |
1743 | ||
1744 | for (i = 0; i < HOST_BITS_PER_WIDE_INT; i++) | |
1745 | { | |
1746 | if (mask & 1) | |
1747 | break; | |
1748 | mask >>= 1; | |
1749 | align *= 2; | |
1750 | } | |
a1ab4c31 AC |
1751 | } |
1752 | ||
1753 | pos = compute_related_constant (curpos, | |
1754 | round_up (last_pos, align)); | |
1755 | } | |
1756 | else if (!pos && TREE_CODE (curpos) == PLUS_EXPR | |
1757 | && TREE_CODE (TREE_OPERAND (curpos, 1)) == INTEGER_CST | |
1758 | && TREE_CODE (TREE_OPERAND (curpos, 0)) == MULT_EXPR | |
1759 | && host_integerp (TREE_OPERAND | |
1760 | (TREE_OPERAND (curpos, 0), 1), | |
1761 | 1)) | |
1762 | { | |
1763 | align | |
1764 | = tree_low_cst | |
1765 | (TREE_OPERAND (TREE_OPERAND (curpos, 0), 1), 1); | |
1766 | pos = compute_related_constant (curpos, | |
1767 | round_up (last_pos, align)); | |
1768 | } | |
1769 | else if (potential_alignment_gap (prev_old_field, old_field, | |
1770 | pos)) | |
1771 | { | |
1772 | align = TYPE_ALIGN (field_type); | |
1773 | pos = compute_related_constant (curpos, | |
1774 | round_up (last_pos, align)); | |
1775 | } | |
1776 | ||
1777 | /* If we can't compute a position, set it to zero. | |
1778 | ||
1779 | ??? We really should abort here, but it's too much work | |
1780 | to get this correct for all cases. */ | |
1781 | ||
1782 | if (!pos) | |
1783 | pos = bitsize_zero_node; | |
1784 | ||
1785 | /* See if this type is variable-sized and make a pointer type | |
1786 | and indicate the indirection if so. Beware that the debug | |
1787 | back-end may adjust the position computed above according | |
1788 | to the alignment of the field type, i.e. the pointer type | |
1789 | in this case, if we don't preventively counter that. */ | |
1790 | if (TREE_CODE (DECL_SIZE (old_field)) != INTEGER_CST) | |
1791 | { | |
1792 | field_type = build_pointer_type (field_type); | |
1793 | if (align != 0 && TYPE_ALIGN (field_type) > align) | |
1794 | { | |
1795 | field_type = copy_node (field_type); | |
1796 | TYPE_ALIGN (field_type) = align; | |
1797 | } | |
1798 | var = true; | |
1799 | } | |
1800 | ||
1801 | /* Make a new field name, if necessary. */ | |
1802 | if (var || align != 0) | |
1803 | { | |
1804 | char suffix[16]; | |
1805 | ||
1806 | if (align != 0) | |
1807 | sprintf (suffix, "XV%c%u", var ? 'L' : 'A', | |
1808 | align / BITS_PER_UNIT); | |
1809 | else | |
1810 | strcpy (suffix, "XVL"); | |
1811 | ||
0fb2335d | 1812 | field_name = concat_name (field_name, suffix); |
a1ab4c31 AC |
1813 | } |
1814 | ||
da01bfee EB |
1815 | new_field |
1816 | = create_field_decl (field_name, field_type, new_record_type, | |
1817 | DECL_SIZE (old_field), pos, 0, 0); | |
910ad8de | 1818 | DECL_CHAIN (new_field) = TYPE_FIELDS (new_record_type); |
a1ab4c31 AC |
1819 | TYPE_FIELDS (new_record_type) = new_field; |
1820 | ||
1821 | /* If old_field is a QUAL_UNION_TYPE, take its size as being | |
1822 | zero. The only time it's not the last field of the record | |
1823 | is when there are other components at fixed positions after | |
1824 | it (meaning there was a rep clause for every field) and we | |
1825 | want to be able to encode them. */ | |
1826 | last_pos = size_binop (PLUS_EXPR, bit_position (old_field), | |
1827 | (TREE_CODE (TREE_TYPE (old_field)) | |
1828 | == QUAL_UNION_TYPE) | |
1829 | ? bitsize_zero_node | |
1830 | : DECL_SIZE (old_field)); | |
1831 | prev_old_field = old_field; | |
1832 | } | |
1833 | ||
fb88e1dd | 1834 | TYPE_FIELDS (new_record_type) = nreverse (TYPE_FIELDS (new_record_type)); |
a1ab4c31 | 1835 | |
a5695aa2 | 1836 | add_parallel_type (record_type, new_record_type); |
a1ab4c31 | 1837 | } |
a1ab4c31 AC |
1838 | } |
1839 | ||
a1ab4c31 | 1840 | /* Utility function of above to merge LAST_SIZE, the previous size of a record |
1e17ef87 EB |
1841 | with FIRST_BIT and SIZE that describe a field. SPECIAL is true if this |
1842 | represents a QUAL_UNION_TYPE in which case we must look for COND_EXPRs and | |
1843 | replace a value of zero with the old size. If HAS_REP is true, we take the | |
1844 | MAX of the end position of this field with LAST_SIZE. In all other cases, | |
1845 | we use FIRST_BIT plus SIZE. Return an expression for the size. */ | |
a1ab4c31 AC |
1846 | |
1847 | static tree | |
1848 | merge_sizes (tree last_size, tree first_bit, tree size, bool special, | |
1849 | bool has_rep) | |
1850 | { | |
1851 | tree type = TREE_TYPE (last_size); | |
c6bd4220 | 1852 | tree new_size; |
a1ab4c31 AC |
1853 | |
1854 | if (!special || TREE_CODE (size) != COND_EXPR) | |
1855 | { | |
c6bd4220 | 1856 | new_size = size_binop (PLUS_EXPR, first_bit, size); |
a1ab4c31 | 1857 | if (has_rep) |
c6bd4220 | 1858 | new_size = size_binop (MAX_EXPR, last_size, new_size); |
a1ab4c31 AC |
1859 | } |
1860 | ||
1861 | else | |
c6bd4220 EB |
1862 | new_size = fold_build3 (COND_EXPR, type, TREE_OPERAND (size, 0), |
1863 | integer_zerop (TREE_OPERAND (size, 1)) | |
1864 | ? last_size : merge_sizes (last_size, first_bit, | |
1865 | TREE_OPERAND (size, 1), | |
1866 | 1, has_rep), | |
1867 | integer_zerop (TREE_OPERAND (size, 2)) | |
1868 | ? last_size : merge_sizes (last_size, first_bit, | |
1869 | TREE_OPERAND (size, 2), | |
1870 | 1, has_rep)); | |
a1ab4c31 AC |
1871 | |
1872 | /* We don't need any NON_VALUE_EXPRs and they can confuse us (especially | |
1873 | when fed through substitute_in_expr) into thinking that a constant | |
1874 | size is not constant. */ | |
c6bd4220 EB |
1875 | while (TREE_CODE (new_size) == NON_LVALUE_EXPR) |
1876 | new_size = TREE_OPERAND (new_size, 0); | |
a1ab4c31 | 1877 | |
c6bd4220 | 1878 | return new_size; |
a1ab4c31 AC |
1879 | } |
1880 | ||
1881 | /* Utility function of above to see if OP0 and OP1, both of SIZETYPE, are | |
1882 | related by the addition of a constant. Return that constant if so. */ | |
1883 | ||
1884 | static tree | |
1885 | compute_related_constant (tree op0, tree op1) | |
1886 | { | |
1887 | tree op0_var, op1_var; | |
1888 | tree op0_con = split_plus (op0, &op0_var); | |
1889 | tree op1_con = split_plus (op1, &op1_var); | |
1890 | tree result = size_binop (MINUS_EXPR, op0_con, op1_con); | |
1891 | ||
1892 | if (operand_equal_p (op0_var, op1_var, 0)) | |
1893 | return result; | |
1894 | else if (operand_equal_p (op0, size_binop (PLUS_EXPR, op1_var, result), 0)) | |
1895 | return result; | |
1896 | else | |
1897 | return 0; | |
1898 | } | |
1899 | ||
1900 | /* Utility function of above to split a tree OP which may be a sum, into a | |
1901 | constant part, which is returned, and a variable part, which is stored | |
1902 | in *PVAR. *PVAR may be bitsize_zero_node. All operations must be of | |
1903 | bitsizetype. */ | |
1904 | ||
1905 | static tree | |
1906 | split_plus (tree in, tree *pvar) | |
1907 | { | |
722356ce EB |
1908 | /* Strip conversions in order to ease the tree traversal and maximize the |
1909 | potential for constant or plus/minus discovery. We need to be careful | |
a1ab4c31 AC |
1910 | to always return and set *pvar to bitsizetype trees, but it's worth |
1911 | the effort. */ | |
722356ce | 1912 | in = remove_conversions (in, false); |
a1ab4c31 AC |
1913 | |
1914 | *pvar = convert (bitsizetype, in); | |
1915 | ||
1916 | if (TREE_CODE (in) == INTEGER_CST) | |
1917 | { | |
1918 | *pvar = bitsize_zero_node; | |
1919 | return convert (bitsizetype, in); | |
1920 | } | |
1921 | else if (TREE_CODE (in) == PLUS_EXPR || TREE_CODE (in) == MINUS_EXPR) | |
1922 | { | |
1923 | tree lhs_var, rhs_var; | |
1924 | tree lhs_con = split_plus (TREE_OPERAND (in, 0), &lhs_var); | |
1925 | tree rhs_con = split_plus (TREE_OPERAND (in, 1), &rhs_var); | |
1926 | ||
1927 | if (lhs_var == TREE_OPERAND (in, 0) | |
1928 | && rhs_var == TREE_OPERAND (in, 1)) | |
1929 | return bitsize_zero_node; | |
1930 | ||
1931 | *pvar = size_binop (TREE_CODE (in), lhs_var, rhs_var); | |
1932 | return size_binop (TREE_CODE (in), lhs_con, rhs_con); | |
1933 | } | |
1934 | else | |
1935 | return bitsize_zero_node; | |
1936 | } | |
1937 | \f | |
d47d0a8d EB |
1938 | /* Return a FUNCTION_TYPE node. RETURN_TYPE is the type returned by the |
1939 | subprogram. If it is VOID_TYPE, then we are dealing with a procedure, | |
1940 | otherwise we are dealing with a function. PARAM_DECL_LIST is a list of | |
1941 | PARM_DECL nodes that are the subprogram parameters. CICO_LIST is the | |
1942 | copy-in/copy-out list to be stored into the TYPE_CICO_LIST field. | |
1943 | RETURN_UNCONSTRAINED_P is true if the function returns an unconstrained | |
1944 | object. RETURN_BY_DIRECT_REF_P is true if the function returns by direct | |
1945 | reference. RETURN_BY_INVISI_REF_P is true if the function returns by | |
1946 | invisible reference. */ | |
a1ab4c31 AC |
1947 | |
1948 | tree | |
1949 | create_subprog_type (tree return_type, tree param_decl_list, tree cico_list, | |
d47d0a8d EB |
1950 | bool return_unconstrained_p, bool return_by_direct_ref_p, |
1951 | bool return_by_invisi_ref_p) | |
a1ab4c31 | 1952 | { |
e5b00edf NF |
1953 | /* A list of the data type nodes of the subprogram formal parameters. |
1954 | This list is generated by traversing the input list of PARM_DECL | |
1955 | nodes. */ | |
9771b263 | 1956 | vec<tree, va_gc> *param_type_list = NULL; |
d47d0a8d | 1957 | tree t, type; |
a1ab4c31 | 1958 | |
910ad8de | 1959 | for (t = param_decl_list; t; t = DECL_CHAIN (t)) |
9771b263 | 1960 | vec_safe_push (param_type_list, TREE_TYPE (t)); |
a1ab4c31 | 1961 | |
e5b00edf | 1962 | type = build_function_type_vec (return_type, param_type_list); |
a1ab4c31 | 1963 | |
d47d0a8d EB |
1964 | /* TYPE may have been shared since GCC hashes types. If it has a different |
1965 | CICO_LIST, make a copy. Likewise for the various flags. */ | |
523e82a7 EB |
1966 | if (!fntype_same_flags_p (type, cico_list, return_unconstrained_p, |
1967 | return_by_direct_ref_p, return_by_invisi_ref_p)) | |
d47d0a8d EB |
1968 | { |
1969 | type = copy_type (type); | |
1970 | TYPE_CI_CO_LIST (type) = cico_list; | |
1971 | TYPE_RETURN_UNCONSTRAINED_P (type) = return_unconstrained_p; | |
1972 | TYPE_RETURN_BY_DIRECT_REF_P (type) = return_by_direct_ref_p; | |
1973 | TREE_ADDRESSABLE (type) = return_by_invisi_ref_p; | |
1974 | } | |
a1ab4c31 | 1975 | |
a1ab4c31 AC |
1976 | return type; |
1977 | } | |
1978 | \f | |
1979 | /* Return a copy of TYPE but safe to modify in any way. */ | |
1980 | ||
1981 | tree | |
1982 | copy_type (tree type) | |
1983 | { | |
c6bd4220 | 1984 | tree new_type = copy_node (type); |
a1ab4c31 | 1985 | |
90dcfecb EB |
1986 | /* Unshare the language-specific data. */ |
1987 | if (TYPE_LANG_SPECIFIC (type)) | |
1988 | { | |
1989 | TYPE_LANG_SPECIFIC (new_type) = NULL; | |
1990 | SET_TYPE_LANG_SPECIFIC (new_type, GET_TYPE_LANG_SPECIFIC (type)); | |
1991 | } | |
1992 | ||
1993 | /* And the contents of the language-specific slot if needed. */ | |
1994 | if ((INTEGRAL_TYPE_P (type) || TREE_CODE (type) == REAL_TYPE) | |
1995 | && TYPE_RM_VALUES (type)) | |
1996 | { | |
1997 | TYPE_RM_VALUES (new_type) = NULL_TREE; | |
1998 | SET_TYPE_RM_SIZE (new_type, TYPE_RM_SIZE (type)); | |
1999 | SET_TYPE_RM_MIN_VALUE (new_type, TYPE_RM_MIN_VALUE (type)); | |
2000 | SET_TYPE_RM_MAX_VALUE (new_type, TYPE_RM_MAX_VALUE (type)); | |
2001 | } | |
2002 | ||
a1ab4c31 AC |
2003 | /* copy_node clears this field instead of copying it, because it is |
2004 | aliased with TREE_CHAIN. */ | |
c6bd4220 | 2005 | TYPE_STUB_DECL (new_type) = TYPE_STUB_DECL (type); |
a1ab4c31 | 2006 | |
c6bd4220 EB |
2007 | TYPE_POINTER_TO (new_type) = 0; |
2008 | TYPE_REFERENCE_TO (new_type) = 0; | |
2009 | TYPE_MAIN_VARIANT (new_type) = new_type; | |
2010 | TYPE_NEXT_VARIANT (new_type) = 0; | |
a1ab4c31 | 2011 | |
c6bd4220 | 2012 | return new_type; |
a1ab4c31 AC |
2013 | } |
2014 | \f | |
c1abd261 EB |
2015 | /* Return a subtype of sizetype with range MIN to MAX and whose |
2016 | TYPE_INDEX_TYPE is INDEX. GNAT_NODE is used for the position | |
2017 | of the associated TYPE_DECL. */ | |
a1ab4c31 AC |
2018 | |
2019 | tree | |
2020 | create_index_type (tree min, tree max, tree index, Node_Id gnat_node) | |
2021 | { | |
2022 | /* First build a type for the desired range. */ | |
523e82a7 | 2023 | tree type = build_nonshared_range_type (sizetype, min, max); |
a1ab4c31 | 2024 | |
523e82a7 | 2025 | /* Then set the index type. */ |
a1ab4c31 AC |
2026 | SET_TYPE_INDEX_TYPE (type, index); |
2027 | create_type_decl (NULL_TREE, type, NULL, true, false, gnat_node); | |
c1abd261 | 2028 | |
a1ab4c31 AC |
2029 | return type; |
2030 | } | |
84fb43a1 EB |
2031 | |
2032 | /* Return a subtype of TYPE with range MIN to MAX. If TYPE is NULL, | |
2033 | sizetype is used. */ | |
2034 | ||
2035 | tree | |
2036 | create_range_type (tree type, tree min, tree max) | |
2037 | { | |
2038 | tree range_type; | |
2039 | ||
2040 | if (type == NULL_TREE) | |
2041 | type = sizetype; | |
2042 | ||
2043 | /* First build a type with the base range. */ | |
523e82a7 EB |
2044 | range_type = build_nonshared_range_type (type, TYPE_MIN_VALUE (type), |
2045 | TYPE_MAX_VALUE (type)); | |
84fb43a1 EB |
2046 | |
2047 | /* Then set the actual range. */ | |
523e82a7 EB |
2048 | SET_TYPE_RM_MIN_VALUE (range_type, convert (type, min)); |
2049 | SET_TYPE_RM_MAX_VALUE (range_type, convert (type, max)); | |
84fb43a1 EB |
2050 | |
2051 | return range_type; | |
2052 | } | |
a1ab4c31 | 2053 | \f |
10069d53 EB |
2054 | /* Return a TYPE_DECL node suitable for the TYPE_STUB_DECL field of a type. |
2055 | TYPE_NAME gives the name of the type and TYPE is a ..._TYPE node giving | |
2056 | its data type. */ | |
2057 | ||
2058 | tree | |
2059 | create_type_stub_decl (tree type_name, tree type) | |
2060 | { | |
2061 | /* Using a named TYPE_DECL ensures that a type name marker is emitted in | |
2062 | STABS while setting DECL_ARTIFICIAL ensures that no DW_TAG_typedef is | |
2063 | emitted in DWARF. */ | |
c172df28 AH |
2064 | tree type_decl = build_decl (input_location, |
2065 | TYPE_DECL, type_name, type); | |
10069d53 | 2066 | DECL_ARTIFICIAL (type_decl) = 1; |
bc712852 | 2067 | TYPE_ARTIFICIAL (type) = 1; |
10069d53 EB |
2068 | return type_decl; |
2069 | } | |
2070 | ||
2071 | /* Return a TYPE_DECL node. TYPE_NAME gives the name of the type and TYPE | |
2072 | is a ..._TYPE node giving its data type. ARTIFICIAL_P is true if this | |
2073 | is a declaration that was generated by the compiler. DEBUG_INFO_P is | |
2074 | true if we need to write debug information about this type. GNAT_NODE | |
2075 | is used for the position of the decl. */ | |
a1ab4c31 AC |
2076 | |
2077 | tree | |
2078 | create_type_decl (tree type_name, tree type, struct attrib *attr_list, | |
2079 | bool artificial_p, bool debug_info_p, Node_Id gnat_node) | |
2080 | { | |
a1ab4c31 | 2081 | enum tree_code code = TREE_CODE (type); |
10069d53 EB |
2082 | bool named = TYPE_NAME (type) && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL; |
2083 | tree type_decl; | |
a1ab4c31 | 2084 | |
10069d53 EB |
2085 | /* Only the builtin TYPE_STUB_DECL should be used for dummy types. */ |
2086 | gcc_assert (!TYPE_IS_DUMMY_P (type)); | |
a1ab4c31 | 2087 | |
10069d53 EB |
2088 | /* If the type hasn't been named yet, we're naming it; preserve an existing |
2089 | TYPE_STUB_DECL that has been attached to it for some purpose. */ | |
2090 | if (!named && TYPE_STUB_DECL (type)) | |
2091 | { | |
2092 | type_decl = TYPE_STUB_DECL (type); | |
2093 | DECL_NAME (type_decl) = type_name; | |
2094 | } | |
2095 | else | |
c172df28 AH |
2096 | type_decl = build_decl (input_location, |
2097 | TYPE_DECL, type_name, type); | |
a1ab4c31 | 2098 | |
10069d53 | 2099 | DECL_ARTIFICIAL (type_decl) = artificial_p; |
bc712852 | 2100 | TYPE_ARTIFICIAL (type) = artificial_p; |
58c8f770 EB |
2101 | |
2102 | /* Add this decl to the current binding level. */ | |
10069d53 | 2103 | gnat_pushdecl (type_decl, gnat_node); |
58c8f770 | 2104 | |
a1ab4c31 AC |
2105 | process_attributes (type_decl, attr_list); |
2106 | ||
10069d53 EB |
2107 | /* If we're naming the type, equate the TYPE_STUB_DECL to the name. |
2108 | This causes the name to be also viewed as a "tag" by the debug | |
2109 | back-end, with the advantage that no DW_TAG_typedef is emitted | |
2110 | for artificial "tagged" types in DWARF. */ | |
2111 | if (!named) | |
2112 | TYPE_STUB_DECL (type) = type_decl; | |
2113 | ||
50741117 EB |
2114 | /* Do not generate debug info for UNCONSTRAINED_ARRAY_TYPE that the |
2115 | back-end doesn't support, and for others if we don't need to. */ | |
a1ab4c31 AC |
2116 | if (code == UNCONSTRAINED_ARRAY_TYPE || !debug_info_p) |
2117 | DECL_IGNORED_P (type_decl) = 1; | |
a1ab4c31 AC |
2118 | |
2119 | return type_decl; | |
2120 | } | |
10069d53 | 2121 | \f |
a1ab4c31 AC |
2122 | /* Return a VAR_DECL or CONST_DECL node. |
2123 | ||
2124 | VAR_NAME gives the name of the variable. ASM_NAME is its assembler name | |
2125 | (if provided). TYPE is its data type (a GCC ..._TYPE node). VAR_INIT is | |
2126 | the GCC tree for an optional initial expression; NULL_TREE if none. | |
2127 | ||
2128 | CONST_FLAG is true if this variable is constant, in which case we might | |
2129 | return a CONST_DECL node unless CONST_DECL_ALLOWED_P is false. | |
2130 | ||
2131 | PUBLIC_FLAG is true if this is for a reference to a public entity or for a | |
2132 | definition to be made visible outside of the current compilation unit, for | |
2133 | instance variable definitions in a package specification. | |
2134 | ||
1e17ef87 | 2135 | EXTERN_FLAG is true when processing an external variable declaration (as |
a1ab4c31 AC |
2136 | opposed to a definition: no storage is to be allocated for the variable). |
2137 | ||
2138 | STATIC_FLAG is only relevant when not at top level. In that case | |
2139 | it indicates whether to always allocate storage to the variable. | |
2140 | ||
2141 | GNAT_NODE is used for the position of the decl. */ | |
2142 | ||
2143 | tree | |
2144 | create_var_decl_1 (tree var_name, tree asm_name, tree type, tree var_init, | |
2145 | bool const_flag, bool public_flag, bool extern_flag, | |
2146 | bool static_flag, bool const_decl_allowed_p, | |
2147 | struct attrib *attr_list, Node_Id gnat_node) | |
2148 | { | |
50179d58 EB |
2149 | /* Whether the initializer is a constant initializer. At the global level |
2150 | or for an external object or an object to be allocated in static memory, | |
2151 | we check that it is a valid constant expression for use in initializing | |
2152 | a static variable; otherwise, we only check that it is constant. */ | |
a1ab4c31 AC |
2153 | bool init_const |
2154 | = (var_init != 0 | |
2155 | && gnat_types_compatible_p (type, TREE_TYPE (var_init)) | |
50179d58 | 2156 | && (global_bindings_p () || extern_flag || static_flag |
a1ab4c31 AC |
2157 | ? initializer_constant_valid_p (var_init, TREE_TYPE (var_init)) != 0 |
2158 | : TREE_CONSTANT (var_init))); | |
2159 | ||
2160 | /* Whether we will make TREE_CONSTANT the DECL we produce here, in which | |
2161 | case the initializer may be used in-lieu of the DECL node (as done in | |
2162 | Identifier_to_gnu). This is useful to prevent the need of elaboration | |
2163 | code when an identifier for which such a decl is made is in turn used as | |
2164 | an initializer. We used to rely on CONST vs VAR_DECL for this purpose, | |
2165 | but extra constraints apply to this choice (see below) and are not | |
2166 | relevant to the distinction we wish to make. */ | |
2167 | bool constant_p = const_flag && init_const; | |
2168 | ||
2169 | /* The actual DECL node. CONST_DECL was initially intended for enumerals | |
2170 | and may be used for scalars in general but not for aggregates. */ | |
2171 | tree var_decl | |
c172df28 AH |
2172 | = build_decl (input_location, |
2173 | (constant_p && const_decl_allowed_p | |
a1ab4c31 AC |
2174 | && !AGGREGATE_TYPE_P (type)) ? CONST_DECL : VAR_DECL, |
2175 | var_name, type); | |
2176 | ||
2177 | /* If this is external, throw away any initializations (they will be done | |
2178 | elsewhere) unless this is a constant for which we would like to remain | |
2179 | able to get the initializer. If we are defining a global here, leave a | |
2180 | constant initialization and save any variable elaborations for the | |
2181 | elaboration routine. If we are just annotating types, throw away the | |
2182 | initialization if it isn't a constant. */ | |
2183 | if ((extern_flag && !constant_p) | |
2184 | || (type_annotate_only && var_init && !TREE_CONSTANT (var_init))) | |
2185 | var_init = NULL_TREE; | |
2186 | ||
2187 | /* At the global level, an initializer requiring code to be generated | |
2188 | produces elaboration statements. Check that such statements are allowed, | |
2189 | that is, not violating a No_Elaboration_Code restriction. */ | |
3b9e8343 | 2190 | if (global_bindings_p () && var_init != 0 && !init_const) |
a1ab4c31 | 2191 | Check_Elaboration_Code_Allowed (gnat_node); |
3b9e8343 | 2192 | |
8b7b0c36 JH |
2193 | DECL_INITIAL (var_decl) = var_init; |
2194 | TREE_READONLY (var_decl) = const_flag; | |
2195 | DECL_EXTERNAL (var_decl) = extern_flag; | |
2196 | TREE_PUBLIC (var_decl) = public_flag || extern_flag; | |
2197 | TREE_CONSTANT (var_decl) = constant_p; | |
2198 | TREE_THIS_VOLATILE (var_decl) = TREE_SIDE_EFFECTS (var_decl) | |
2199 | = TYPE_VOLATILE (type); | |
a1ab4c31 AC |
2200 | |
2201 | /* Ada doesn't feature Fortran-like COMMON variables so we shouldn't | |
2202 | try to fiddle with DECL_COMMON. However, on platforms that don't | |
2203 | support global BSS sections, uninitialized global variables would | |
2204 | go in DATA instead, thus increasing the size of the executable. */ | |
2205 | if (!flag_no_common | |
2206 | && TREE_CODE (var_decl) == VAR_DECL | |
3b9e8343 | 2207 | && TREE_PUBLIC (var_decl) |
a1ab4c31 AC |
2208 | && !have_global_bss_p ()) |
2209 | DECL_COMMON (var_decl) = 1; | |
a1ab4c31 | 2210 | |
2231f17f EB |
2211 | /* At the global binding level, we need to allocate static storage for the |
2212 | variable if it isn't external. Otherwise, we allocate automatic storage | |
2213 | unless requested not to. */ | |
a1ab4c31 | 2214 | TREE_STATIC (var_decl) |
2231f17f | 2215 | = !extern_flag && (static_flag || global_bindings_p ()); |
a1ab4c31 | 2216 | |
5225a138 EB |
2217 | /* For an external constant whose initializer is not absolute, do not emit |
2218 | debug info. In DWARF this would mean a global relocation in a read-only | |
c01fe451 | 2219 | section which runs afoul of the PE-COFF run-time relocation mechanism. */ |
5225a138 EB |
2220 | if (extern_flag |
2221 | && constant_p | |
50179d58 | 2222 | && var_init |
5225a138 EB |
2223 | && initializer_constant_valid_p (var_init, TREE_TYPE (var_init)) |
2224 | != null_pointer_node) | |
2225 | DECL_IGNORED_P (var_decl) = 1; | |
2226 | ||
a1ab4c31 AC |
2227 | /* Add this decl to the current binding level. */ |
2228 | gnat_pushdecl (var_decl, gnat_node); | |
2229 | ||
2230 | if (TREE_SIDE_EFFECTS (var_decl)) | |
2231 | TREE_ADDRESSABLE (var_decl) = 1; | |
2232 | ||
58c8f770 | 2233 | if (TREE_CODE (var_decl) == VAR_DECL) |
a1ab4c31 | 2234 | { |
58c8f770 EB |
2235 | if (asm_name) |
2236 | SET_DECL_ASSEMBLER_NAME (var_decl, asm_name); | |
2237 | process_attributes (var_decl, attr_list); | |
a1ab4c31 AC |
2238 | if (global_bindings_p ()) |
2239 | rest_of_decl_compilation (var_decl, true, 0); | |
2240 | } | |
a1ab4c31 AC |
2241 | |
2242 | return var_decl; | |
2243 | } | |
2244 | \f | |
2245 | /* Return true if TYPE, an aggregate type, contains (or is) an array. */ | |
2246 | ||
2247 | static bool | |
2248 | aggregate_type_contains_array_p (tree type) | |
2249 | { | |
2250 | switch (TREE_CODE (type)) | |
2251 | { | |
2252 | case RECORD_TYPE: | |
2253 | case UNION_TYPE: | |
2254 | case QUAL_UNION_TYPE: | |
2255 | { | |
2256 | tree field; | |
910ad8de | 2257 | for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
2258 | if (AGGREGATE_TYPE_P (TREE_TYPE (field)) |
2259 | && aggregate_type_contains_array_p (TREE_TYPE (field))) | |
2260 | return true; | |
2261 | return false; | |
2262 | } | |
2263 | ||
2264 | case ARRAY_TYPE: | |
2265 | return true; | |
2266 | ||
2267 | default: | |
2268 | gcc_unreachable (); | |
2269 | } | |
2270 | } | |
2271 | ||
62f9f3ce | 2272 | /* Return a FIELD_DECL node. FIELD_NAME is the field's name, FIELD_TYPE is |
da01bfee EB |
2273 | its type and RECORD_TYPE is the type of the enclosing record. If SIZE is |
2274 | nonzero, it is the specified size of the field. If POS is nonzero, it is | |
2275 | the bit position. PACKED is 1 if the enclosing record is packed, -1 if it | |
2276 | has Component_Alignment of Storage_Unit. If ADDRESSABLE is nonzero, it | |
62f9f3ce EB |
2277 | means we are allowed to take the address of the field; if it is negative, |
2278 | we should not make a bitfield, which is used by make_aligning_type. */ | |
a1ab4c31 AC |
2279 | |
2280 | tree | |
2281 | create_field_decl (tree field_name, tree field_type, tree record_type, | |
da01bfee | 2282 | tree size, tree pos, int packed, int addressable) |
a1ab4c31 | 2283 | { |
c172df28 AH |
2284 | tree field_decl = build_decl (input_location, |
2285 | FIELD_DECL, field_name, field_type); | |
a1ab4c31 AC |
2286 | |
2287 | DECL_CONTEXT (field_decl) = record_type; | |
2288 | TREE_READONLY (field_decl) = TYPE_READONLY (field_type); | |
2289 | ||
2290 | /* If FIELD_TYPE is BLKmode, we must ensure this is aligned to at least a | |
2291 | byte boundary since GCC cannot handle less-aligned BLKmode bitfields. | |
2292 | Likewise for an aggregate without specified position that contains an | |
2293 | array, because in this case slices of variable length of this array | |
2294 | must be handled by GCC and variable-sized objects need to be aligned | |
2295 | to at least a byte boundary. */ | |
2296 | if (packed && (TYPE_MODE (field_type) == BLKmode | |
2297 | || (!pos | |
2298 | && AGGREGATE_TYPE_P (field_type) | |
2299 | && aggregate_type_contains_array_p (field_type)))) | |
2300 | DECL_ALIGN (field_decl) = BITS_PER_UNIT; | |
2301 | ||
2302 | /* If a size is specified, use it. Otherwise, if the record type is packed | |
2303 | compute a size to use, which may differ from the object's natural size. | |
2304 | We always set a size in this case to trigger the checks for bitfield | |
2305 | creation below, which is typically required when no position has been | |
2306 | specified. */ | |
2307 | if (size) | |
2308 | size = convert (bitsizetype, size); | |
2309 | else if (packed == 1) | |
2310 | { | |
2311 | size = rm_size (field_type); | |
62f9f3ce EB |
2312 | if (TYPE_MODE (field_type) == BLKmode) |
2313 | size = round_up (size, BITS_PER_UNIT); | |
a1ab4c31 AC |
2314 | } |
2315 | ||
2316 | /* If we may, according to ADDRESSABLE, make a bitfield if a size is | |
2317 | specified for two reasons: first if the size differs from the natural | |
2318 | size. Second, if the alignment is insufficient. There are a number of | |
2319 | ways the latter can be true. | |
2320 | ||
2321 | We never make a bitfield if the type of the field has a nonconstant size, | |
2322 | because no such entity requiring bitfield operations should reach here. | |
2323 | ||
2324 | We do *preventively* make a bitfield when there might be the need for it | |
2325 | but we don't have all the necessary information to decide, as is the case | |
2326 | of a field with no specified position in a packed record. | |
2327 | ||
2328 | We also don't look at STRICT_ALIGNMENT here, and rely on later processing | |
2329 | in layout_decl or finish_record_type to clear the bit_field indication if | |
2330 | it is in fact not needed. */ | |
2331 | if (addressable >= 0 | |
2332 | && size | |
2333 | && TREE_CODE (size) == INTEGER_CST | |
2334 | && TREE_CODE (TYPE_SIZE (field_type)) == INTEGER_CST | |
2335 | && (!tree_int_cst_equal (size, TYPE_SIZE (field_type)) | |
2336 | || (pos && !value_factor_p (pos, TYPE_ALIGN (field_type))) | |
2337 | || packed | |
2338 | || (TYPE_ALIGN (record_type) != 0 | |
2339 | && TYPE_ALIGN (record_type) < TYPE_ALIGN (field_type)))) | |
2340 | { | |
2341 | DECL_BIT_FIELD (field_decl) = 1; | |
2342 | DECL_SIZE (field_decl) = size; | |
2343 | if (!packed && !pos) | |
feec4372 EB |
2344 | { |
2345 | if (TYPE_ALIGN (record_type) != 0 | |
2346 | && TYPE_ALIGN (record_type) < TYPE_ALIGN (field_type)) | |
2347 | DECL_ALIGN (field_decl) = TYPE_ALIGN (record_type); | |
2348 | else | |
2349 | DECL_ALIGN (field_decl) = TYPE_ALIGN (field_type); | |
2350 | } | |
a1ab4c31 AC |
2351 | } |
2352 | ||
2353 | DECL_PACKED (field_decl) = pos ? DECL_BIT_FIELD (field_decl) : packed; | |
2354 | ||
2355 | /* Bump the alignment if need be, either for bitfield/packing purposes or | |
2356 | to satisfy the type requirements if no such consideration applies. When | |
2357 | we get the alignment from the type, indicate if this is from an explicit | |
2358 | user request, which prevents stor-layout from lowering it later on. */ | |
2359 | { | |
d9223014 | 2360 | unsigned int bit_align |
a1ab4c31 AC |
2361 | = (DECL_BIT_FIELD (field_decl) ? 1 |
2362 | : packed && TYPE_MODE (field_type) != BLKmode ? BITS_PER_UNIT : 0); | |
2363 | ||
2364 | if (bit_align > DECL_ALIGN (field_decl)) | |
2365 | DECL_ALIGN (field_decl) = bit_align; | |
2366 | else if (!bit_align && TYPE_ALIGN (field_type) > DECL_ALIGN (field_decl)) | |
2367 | { | |
2368 | DECL_ALIGN (field_decl) = TYPE_ALIGN (field_type); | |
2369 | DECL_USER_ALIGN (field_decl) = TYPE_USER_ALIGN (field_type); | |
2370 | } | |
2371 | } | |
2372 | ||
2373 | if (pos) | |
2374 | { | |
2375 | /* We need to pass in the alignment the DECL is known to have. | |
2376 | This is the lowest-order bit set in POS, but no more than | |
2377 | the alignment of the record, if one is specified. Note | |
2378 | that an alignment of 0 is taken as infinite. */ | |
2379 | unsigned int known_align; | |
2380 | ||
2381 | if (host_integerp (pos, 1)) | |
2382 | known_align = tree_low_cst (pos, 1) & - tree_low_cst (pos, 1); | |
2383 | else | |
2384 | known_align = BITS_PER_UNIT; | |
2385 | ||
2386 | if (TYPE_ALIGN (record_type) | |
2387 | && (known_align == 0 || known_align > TYPE_ALIGN (record_type))) | |
2388 | known_align = TYPE_ALIGN (record_type); | |
2389 | ||
2390 | layout_decl (field_decl, known_align); | |
2391 | SET_DECL_OFFSET_ALIGN (field_decl, | |
2392 | host_integerp (pos, 1) ? BIGGEST_ALIGNMENT | |
2393 | : BITS_PER_UNIT); | |
2394 | pos_from_bit (&DECL_FIELD_OFFSET (field_decl), | |
2395 | &DECL_FIELD_BIT_OFFSET (field_decl), | |
2396 | DECL_OFFSET_ALIGN (field_decl), pos); | |
a1ab4c31 AC |
2397 | } |
2398 | ||
2399 | /* In addition to what our caller says, claim the field is addressable if we | |
2400 | know that its type is not suitable. | |
2401 | ||
2402 | The field may also be "technically" nonaddressable, meaning that even if | |
2403 | we attempt to take the field's address we will actually get the address | |
2404 | of a copy. This is the case for true bitfields, but the DECL_BIT_FIELD | |
2405 | value we have at this point is not accurate enough, so we don't account | |
2406 | for this here and let finish_record_type decide. */ | |
4c5a0615 | 2407 | if (!addressable && !type_for_nonaliased_component_p (field_type)) |
a1ab4c31 AC |
2408 | addressable = 1; |
2409 | ||
2410 | DECL_NONADDRESSABLE_P (field_decl) = !addressable; | |
2411 | ||
2412 | return field_decl; | |
2413 | } | |
2414 | \f | |
a8e05f92 EB |
2415 | /* Return a PARM_DECL node. PARAM_NAME is the name of the parameter and |
2416 | PARAM_TYPE is its type. READONLY is true if the parameter is readonly | |
2417 | (either an In parameter or an address of a pass-by-ref parameter). */ | |
a1ab4c31 AC |
2418 | |
2419 | tree | |
2420 | create_param_decl (tree param_name, tree param_type, bool readonly) | |
2421 | { | |
c172df28 AH |
2422 | tree param_decl = build_decl (input_location, |
2423 | PARM_DECL, param_name, param_type); | |
a1ab4c31 | 2424 | |
a8e05f92 EB |
2425 | /* Honor TARGET_PROMOTE_PROTOTYPES like the C compiler, as not doing so |
2426 | can lead to various ABI violations. */ | |
2427 | if (targetm.calls.promote_prototypes (NULL_TREE) | |
2428 | && INTEGRAL_TYPE_P (param_type) | |
a1ab4c31 AC |
2429 | && TYPE_PRECISION (param_type) < TYPE_PRECISION (integer_type_node)) |
2430 | { | |
2431 | /* We have to be careful about biased types here. Make a subtype | |
2432 | of integer_type_node with the proper biasing. */ | |
2433 | if (TREE_CODE (param_type) == INTEGER_TYPE | |
2434 | && TYPE_BIASED_REPRESENTATION_P (param_type)) | |
2435 | { | |
84fb43a1 EB |
2436 | tree subtype |
2437 | = make_unsigned_type (TYPE_PRECISION (integer_type_node)); | |
c1abd261 EB |
2438 | TREE_TYPE (subtype) = integer_type_node; |
2439 | TYPE_BIASED_REPRESENTATION_P (subtype) = 1; | |
84fb43a1 EB |
2440 | SET_TYPE_RM_MIN_VALUE (subtype, TYPE_MIN_VALUE (param_type)); |
2441 | SET_TYPE_RM_MAX_VALUE (subtype, TYPE_MAX_VALUE (param_type)); | |
c1abd261 | 2442 | param_type = subtype; |
a1ab4c31 AC |
2443 | } |
2444 | else | |
2445 | param_type = integer_type_node; | |
2446 | } | |
2447 | ||
2448 | DECL_ARG_TYPE (param_decl) = param_type; | |
2449 | TREE_READONLY (param_decl) = readonly; | |
2450 | return param_decl; | |
2451 | } | |
2452 | \f | |
2453 | /* Given a DECL and ATTR_LIST, process the listed attributes. */ | |
2454 | ||
58c8f770 | 2455 | static void |
a1ab4c31 AC |
2456 | process_attributes (tree decl, struct attrib *attr_list) |
2457 | { | |
2458 | for (; attr_list; attr_list = attr_list->next) | |
2459 | switch (attr_list->type) | |
2460 | { | |
2461 | case ATTR_MACHINE_ATTRIBUTE: | |
58c8f770 | 2462 | input_location = DECL_SOURCE_LOCATION (decl); |
a1ab4c31 AC |
2463 | decl_attributes (&decl, tree_cons (attr_list->name, attr_list->args, |
2464 | NULL_TREE), | |
2465 | ATTR_FLAG_TYPE_IN_PLACE); | |
2466 | break; | |
2467 | ||
2468 | case ATTR_LINK_ALIAS: | |
2469 | if (! DECL_EXTERNAL (decl)) | |
2470 | { | |
2471 | TREE_STATIC (decl) = 1; | |
2472 | assemble_alias (decl, attr_list->name); | |
2473 | } | |
2474 | break; | |
2475 | ||
2476 | case ATTR_WEAK_EXTERNAL: | |
2477 | if (SUPPORTS_WEAK) | |
2478 | declare_weak (decl); | |
2479 | else | |
2480 | post_error ("?weak declarations not supported on this target", | |
2481 | attr_list->error_point); | |
2482 | break; | |
2483 | ||
2484 | case ATTR_LINK_SECTION: | |
677f3fa8 | 2485 | if (targetm_common.have_named_sections) |
a1ab4c31 AC |
2486 | { |
2487 | DECL_SECTION_NAME (decl) | |
2488 | = build_string (IDENTIFIER_LENGTH (attr_list->name), | |
2489 | IDENTIFIER_POINTER (attr_list->name)); | |
2490 | DECL_COMMON (decl) = 0; | |
2491 | } | |
2492 | else | |
2493 | post_error ("?section attributes are not supported for this target", | |
2494 | attr_list->error_point); | |
2495 | break; | |
2496 | ||
2497 | case ATTR_LINK_CONSTRUCTOR: | |
2498 | DECL_STATIC_CONSTRUCTOR (decl) = 1; | |
2499 | TREE_USED (decl) = 1; | |
2500 | break; | |
2501 | ||
2502 | case ATTR_LINK_DESTRUCTOR: | |
2503 | DECL_STATIC_DESTRUCTOR (decl) = 1; | |
2504 | TREE_USED (decl) = 1; | |
2505 | break; | |
40a14772 TG |
2506 | |
2507 | case ATTR_THREAD_LOCAL_STORAGE: | |
62298c61 TG |
2508 | DECL_TLS_MODEL (decl) = decl_default_tls_model (decl); |
2509 | DECL_COMMON (decl) = 0; | |
40a14772 | 2510 | break; |
a1ab4c31 AC |
2511 | } |
2512 | } | |
2513 | \f | |
feec4372 | 2514 | /* Record DECL as a global renaming pointer. */ |
a1ab4c31 AC |
2515 | |
2516 | void | |
2517 | record_global_renaming_pointer (tree decl) | |
2518 | { | |
15bf7d19 | 2519 | gcc_assert (!DECL_LOOP_PARM_P (decl) && DECL_RENAMED_OBJECT (decl)); |
9771b263 | 2520 | vec_safe_push (global_renaming_pointers, decl); |
a1ab4c31 AC |
2521 | } |
2522 | ||
2523 | /* Invalidate the global renaming pointers. */ | |
2524 | ||
2525 | void | |
2526 | invalidate_global_renaming_pointers (void) | |
2527 | { | |
2528 | unsigned int i; | |
2529 | tree iter; | |
2530 | ||
9771b263 DN |
2531 | if (global_renaming_pointers == NULL) |
2532 | return; | |
2533 | ||
2534 | FOR_EACH_VEC_ELT (*global_renaming_pointers, i, iter) | |
a1ab4c31 AC |
2535 | SET_DECL_RENAMED_OBJECT (iter, NULL_TREE); |
2536 | ||
9771b263 | 2537 | vec_free (global_renaming_pointers); |
a1ab4c31 AC |
2538 | } |
2539 | ||
2540 | /* Return true if VALUE is a known to be a multiple of FACTOR, which must be | |
2541 | a power of 2. */ | |
2542 | ||
2543 | bool | |
2544 | value_factor_p (tree value, HOST_WIDE_INT factor) | |
2545 | { | |
2546 | if (host_integerp (value, 1)) | |
2547 | return tree_low_cst (value, 1) % factor == 0; | |
2548 | ||
2549 | if (TREE_CODE (value) == MULT_EXPR) | |
2550 | return (value_factor_p (TREE_OPERAND (value, 0), factor) | |
2551 | || value_factor_p (TREE_OPERAND (value, 1), factor)); | |
2552 | ||
2553 | return false; | |
2554 | } | |
2555 | ||
7d7fcb08 | 2556 | /* Given two consecutive field decls PREV_FIELD and CURR_FIELD, return true |
a1ab4c31 AC |
2557 | unless we can prove these 2 fields are laid out in such a way that no gap |
2558 | exist between the end of PREV_FIELD and the beginning of CURR_FIELD. OFFSET | |
2559 | is the distance in bits between the end of PREV_FIELD and the starting | |
2560 | position of CURR_FIELD. It is ignored if null. */ | |
2561 | ||
2562 | static bool | |
2563 | potential_alignment_gap (tree prev_field, tree curr_field, tree offset) | |
2564 | { | |
2565 | /* If this is the first field of the record, there cannot be any gap */ | |
2566 | if (!prev_field) | |
2567 | return false; | |
2568 | ||
2569 | /* If the previous field is a union type, then return False: The only | |
2570 | time when such a field is not the last field of the record is when | |
2571 | there are other components at fixed positions after it (meaning there | |
2572 | was a rep clause for every field), in which case we don't want the | |
2573 | alignment constraint to override them. */ | |
2574 | if (TREE_CODE (TREE_TYPE (prev_field)) == QUAL_UNION_TYPE) | |
2575 | return false; | |
2576 | ||
2577 | /* If the distance between the end of prev_field and the beginning of | |
2578 | curr_field is constant, then there is a gap if the value of this | |
2579 | constant is not null. */ | |
2580 | if (offset && host_integerp (offset, 1)) | |
2581 | return !integer_zerop (offset); | |
2582 | ||
2583 | /* If the size and position of the previous field are constant, | |
2584 | then check the sum of this size and position. There will be a gap | |
2585 | iff it is not multiple of the current field alignment. */ | |
2586 | if (host_integerp (DECL_SIZE (prev_field), 1) | |
2587 | && host_integerp (bit_position (prev_field), 1)) | |
2588 | return ((tree_low_cst (bit_position (prev_field), 1) | |
2589 | + tree_low_cst (DECL_SIZE (prev_field), 1)) | |
2590 | % DECL_ALIGN (curr_field) != 0); | |
2591 | ||
2592 | /* If both the position and size of the previous field are multiples | |
2593 | of the current field alignment, there cannot be any gap. */ | |
2594 | if (value_factor_p (bit_position (prev_field), DECL_ALIGN (curr_field)) | |
2595 | && value_factor_p (DECL_SIZE (prev_field), DECL_ALIGN (curr_field))) | |
2596 | return false; | |
2597 | ||
2598 | /* Fallback, return that there may be a potential gap */ | |
2599 | return true; | |
2600 | } | |
2601 | ||
88a94e2b EB |
2602 | /* Return a LABEL_DECL with LABEL_NAME. GNAT_NODE is used for the position |
2603 | of the decl. */ | |
a1ab4c31 AC |
2604 | |
2605 | tree | |
88a94e2b | 2606 | create_label_decl (tree label_name, Node_Id gnat_node) |
a1ab4c31 | 2607 | { |
88a94e2b EB |
2608 | tree label_decl |
2609 | = build_decl (input_location, LABEL_DECL, label_name, void_type_node); | |
a1ab4c31 | 2610 | |
88a94e2b EB |
2611 | DECL_MODE (label_decl) = VOIDmode; |
2612 | ||
2613 | /* Add this decl to the current binding level. */ | |
2614 | gnat_pushdecl (label_decl, gnat_node); | |
a1ab4c31 AC |
2615 | |
2616 | return label_decl; | |
2617 | } | |
2618 | \f | |
7d7fcb08 | 2619 | /* Return a FUNCTION_DECL node. SUBPROG_NAME is the name of the subprogram, |
a1ab4c31 AC |
2620 | ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE |
2621 | node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of | |
7d76717d | 2622 | PARM_DECL nodes chained through the DECL_CHAIN field). |
a1ab4c31 | 2623 | |
7d7fcb08 EB |
2624 | INLINE_FLAG, PUBLIC_FLAG, EXTERN_FLAG, ARTIFICIAL_FLAG and ATTR_LIST are |
2625 | used to set the appropriate fields in the FUNCTION_DECL. GNAT_NODE is | |
2626 | used for the position of the decl. */ | |
a1ab4c31 AC |
2627 | |
2628 | tree | |
7d7fcb08 EB |
2629 | create_subprog_decl (tree subprog_name, tree asm_name, tree subprog_type, |
2630 | tree param_decl_list, bool inline_flag, bool public_flag, | |
2631 | bool extern_flag, bool artificial_flag, | |
2632 | struct attrib *attr_list, Node_Id gnat_node) | |
a1ab4c31 | 2633 | { |
d47d0a8d EB |
2634 | tree subprog_decl = build_decl (input_location, FUNCTION_DECL, subprog_name, |
2635 | subprog_type); | |
2636 | tree result_decl = build_decl (input_location, RESULT_DECL, NULL_TREE, | |
2637 | TREE_TYPE (subprog_type)); | |
7d7fcb08 | 2638 | DECL_ARGUMENTS (subprog_decl) = param_decl_list; |
a1ab4c31 | 2639 | |
d84b344a EB |
2640 | /* If this is a non-inline function nested inside an inlined external |
2641 | function, we cannot honor both requests without cloning the nested | |
2642 | function in the current unit since it is private to the other unit. | |
2643 | We could inline the nested function as well but it's probably better | |
2644 | to err on the side of too little inlining. */ | |
2645 | if (!inline_flag | |
5daed84a | 2646 | && !public_flag |
d84b344a EB |
2647 | && current_function_decl |
2648 | && DECL_DECLARED_INLINE_P (current_function_decl) | |
a1ab4c31 | 2649 | && DECL_EXTERNAL (current_function_decl)) |
d84b344a | 2650 | DECL_DECLARED_INLINE_P (current_function_decl) = 0; |
a1ab4c31 | 2651 | |
7d7fcb08 EB |
2652 | DECL_ARTIFICIAL (subprog_decl) = artificial_flag; |
2653 | DECL_EXTERNAL (subprog_decl) = extern_flag; | |
2654 | DECL_DECLARED_INLINE_P (subprog_decl) = inline_flag; | |
2655 | DECL_NO_INLINE_WARNING_P (subprog_decl) = inline_flag && artificial_flag; | |
2656 | ||
2657 | TREE_PUBLIC (subprog_decl) = public_flag; | |
2658 | TREE_READONLY (subprog_decl) = TYPE_READONLY (subprog_type); | |
a1ab4c31 AC |
2659 | TREE_THIS_VOLATILE (subprog_decl) = TYPE_VOLATILE (subprog_type); |
2660 | TREE_SIDE_EFFECTS (subprog_decl) = TYPE_VOLATILE (subprog_type); | |
a1ab4c31 | 2661 | |
d47d0a8d EB |
2662 | DECL_ARTIFICIAL (result_decl) = 1; |
2663 | DECL_IGNORED_P (result_decl) = 1; | |
2664 | DECL_BY_REFERENCE (result_decl) = TREE_ADDRESSABLE (subprog_type); | |
2665 | DECL_RESULT (subprog_decl) = result_decl; | |
a1ab4c31 | 2666 | |
a1ab4c31 AC |
2667 | if (asm_name) |
2668 | { | |
2669 | SET_DECL_ASSEMBLER_NAME (subprog_decl, asm_name); | |
2670 | ||
2671 | /* The expand_main_function circuitry expects "main_identifier_node" to | |
2672 | designate the DECL_NAME of the 'main' entry point, in turn expected | |
2673 | to be declared as the "main" function literally by default. Ada | |
2674 | program entry points are typically declared with a different name | |
2675 | within the binder generated file, exported as 'main' to satisfy the | |
cfbb663c | 2676 | system expectations. Force main_identifier_node in this case. */ |
a1ab4c31 | 2677 | if (asm_name == main_identifier_node) |
cfbb663c | 2678 | DECL_NAME (subprog_decl) = main_identifier_node; |
a1ab4c31 AC |
2679 | } |
2680 | ||
a1ab4c31 AC |
2681 | /* Add this decl to the current binding level. */ |
2682 | gnat_pushdecl (subprog_decl, gnat_node); | |
2683 | ||
58c8f770 EB |
2684 | process_attributes (subprog_decl, attr_list); |
2685 | ||
a1ab4c31 AC |
2686 | /* Output the assembler code and/or RTL for the declaration. */ |
2687 | rest_of_decl_compilation (subprog_decl, global_bindings_p (), 0); | |
2688 | ||
2689 | return subprog_decl; | |
2690 | } | |
2691 | \f | |
2692 | /* Set up the framework for generating code for SUBPROG_DECL, a subprogram | |
2693 | body. This routine needs to be invoked before processing the declarations | |
2694 | appearing in the subprogram. */ | |
2695 | ||
2696 | void | |
2697 | begin_subprog_body (tree subprog_decl) | |
2698 | { | |
2699 | tree param_decl; | |
2700 | ||
a1ab4c31 AC |
2701 | announce_function (subprog_decl); |
2702 | ||
0ae44446 JR |
2703 | /* This function is being defined. */ |
2704 | TREE_STATIC (subprog_decl) = 1; | |
2705 | ||
58c8f770 EB |
2706 | current_function_decl = subprog_decl; |
2707 | ||
a1ab4c31 AC |
2708 | /* Enter a new binding level and show that all the parameters belong to |
2709 | this function. */ | |
2710 | gnat_pushlevel (); | |
a09d56d8 | 2711 | |
a1ab4c31 | 2712 | for (param_decl = DECL_ARGUMENTS (subprog_decl); param_decl; |
910ad8de | 2713 | param_decl = DECL_CHAIN (param_decl)) |
a1ab4c31 AC |
2714 | DECL_CONTEXT (param_decl) = subprog_decl; |
2715 | ||
2716 | make_decl_rtl (subprog_decl); | |
a1ab4c31 AC |
2717 | } |
2718 | ||
71196d4e | 2719 | /* Finish translating the current subprogram and set its BODY. */ |
a1ab4c31 AC |
2720 | |
2721 | void | |
a406865a | 2722 | end_subprog_body (tree body) |
a1ab4c31 AC |
2723 | { |
2724 | tree fndecl = current_function_decl; | |
2725 | ||
bd9c7fb9 | 2726 | /* Attach the BLOCK for this level to the function and pop the level. */ |
a1ab4c31 AC |
2727 | BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl; |
2728 | DECL_INITIAL (fndecl) = current_binding_level->block; | |
2729 | gnat_poplevel (); | |
2730 | ||
a1ab4c31 AC |
2731 | /* Mark the RESULT_DECL as being in this subprogram. */ |
2732 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; | |
2733 | ||
a963da4d EB |
2734 | /* The body should be a BIND_EXPR whose BLOCK is the top-level one. */ |
2735 | if (TREE_CODE (body) == BIND_EXPR) | |
2736 | { | |
2737 | BLOCK_SUPERCONTEXT (BIND_EXPR_BLOCK (body)) = fndecl; | |
2738 | DECL_INITIAL (fndecl) = BIND_EXPR_BLOCK (body); | |
2739 | } | |
2740 | ||
a1ab4c31 AC |
2741 | DECL_SAVED_TREE (fndecl) = body; |
2742 | ||
228ee426 | 2743 | current_function_decl = decl_function_context (fndecl); |
71196d4e EB |
2744 | } |
2745 | ||
2746 | /* Wrap up compilation of SUBPROG_DECL, a subprogram body. */ | |
a1ab4c31 | 2747 | |
71196d4e EB |
2748 | void |
2749 | rest_of_subprog_body_compilation (tree subprog_decl) | |
2750 | { | |
a1ab4c31 AC |
2751 | /* We cannot track the location of errors past this point. */ |
2752 | error_gnat_node = Empty; | |
2753 | ||
2754 | /* If we're only annotating types, don't actually compile this function. */ | |
2755 | if (type_annotate_only) | |
2756 | return; | |
2757 | ||
a406865a | 2758 | /* Dump functions before gimplification. */ |
71196d4e | 2759 | dump_function (TDI_original, subprog_decl); |
a406865a | 2760 | |
228ee426 | 2761 | if (!decl_function_context (subprog_decl)) |
71196d4e | 2762 | cgraph_finalize_function (subprog_decl, false); |
a1ab4c31 AC |
2763 | else |
2764 | /* Register this function with cgraph just far enough to get it | |
2765 | added to our parent's nested function list. */ | |
71196d4e | 2766 | (void) cgraph_get_create_node (subprog_decl); |
a1ab4c31 AC |
2767 | } |
2768 | ||
a1ab4c31 AC |
2769 | tree |
2770 | gnat_builtin_function (tree decl) | |
2771 | { | |
2772 | gnat_pushdecl (decl, Empty); | |
2773 | return decl; | |
2774 | } | |
2775 | ||
2776 | /* Return an integer type with the number of bits of precision given by | |
2777 | PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise | |
2778 | it is a signed type. */ | |
2779 | ||
2780 | tree | |
2781 | gnat_type_for_size (unsigned precision, int unsignedp) | |
2782 | { | |
2783 | tree t; | |
2784 | char type_name[20]; | |
2785 | ||
2786 | if (precision <= 2 * MAX_BITS_PER_WORD | |
2787 | && signed_and_unsigned_types[precision][unsignedp]) | |
2788 | return signed_and_unsigned_types[precision][unsignedp]; | |
2789 | ||
2790 | if (unsignedp) | |
2791 | t = make_unsigned_type (precision); | |
2792 | else | |
2793 | t = make_signed_type (precision); | |
2794 | ||
2795 | if (precision <= 2 * MAX_BITS_PER_WORD) | |
2796 | signed_and_unsigned_types[precision][unsignedp] = t; | |
2797 | ||
2798 | if (!TYPE_NAME (t)) | |
2799 | { | |
2800 | sprintf (type_name, "%sSIGNED_%d", unsignedp ? "UN" : "", precision); | |
2801 | TYPE_NAME (t) = get_identifier (type_name); | |
2802 | } | |
2803 | ||
2804 | return t; | |
2805 | } | |
2806 | ||
2807 | /* Likewise for floating-point types. */ | |
2808 | ||
2809 | static tree | |
2810 | float_type_for_precision (int precision, enum machine_mode mode) | |
2811 | { | |
2812 | tree t; | |
2813 | char type_name[20]; | |
2814 | ||
2815 | if (float_types[(int) mode]) | |
2816 | return float_types[(int) mode]; | |
2817 | ||
2818 | float_types[(int) mode] = t = make_node (REAL_TYPE); | |
2819 | TYPE_PRECISION (t) = precision; | |
2820 | layout_type (t); | |
2821 | ||
2822 | gcc_assert (TYPE_MODE (t) == mode); | |
2823 | if (!TYPE_NAME (t)) | |
2824 | { | |
2825 | sprintf (type_name, "FLOAT_%d", precision); | |
2826 | TYPE_NAME (t) = get_identifier (type_name); | |
2827 | } | |
2828 | ||
2829 | return t; | |
2830 | } | |
2831 | ||
2832 | /* Return a data type that has machine mode MODE. UNSIGNEDP selects | |
2833 | an unsigned type; otherwise a signed type is returned. */ | |
2834 | ||
2835 | tree | |
2836 | gnat_type_for_mode (enum machine_mode mode, int unsignedp) | |
2837 | { | |
2838 | if (mode == BLKmode) | |
2839 | return NULL_TREE; | |
2799d18c EB |
2840 | |
2841 | if (mode == VOIDmode) | |
a1ab4c31 | 2842 | return void_type_node; |
2799d18c EB |
2843 | |
2844 | if (COMPLEX_MODE_P (mode)) | |
a1ab4c31 | 2845 | return NULL_TREE; |
2799d18c EB |
2846 | |
2847 | if (SCALAR_FLOAT_MODE_P (mode)) | |
a1ab4c31 | 2848 | return float_type_for_precision (GET_MODE_PRECISION (mode), mode); |
2799d18c EB |
2849 | |
2850 | if (SCALAR_INT_MODE_P (mode)) | |
a1ab4c31 | 2851 | return gnat_type_for_size (GET_MODE_BITSIZE (mode), unsignedp); |
2799d18c EB |
2852 | |
2853 | if (VECTOR_MODE_P (mode)) | |
2854 | { | |
2855 | enum machine_mode inner_mode = GET_MODE_INNER (mode); | |
2856 | tree inner_type = gnat_type_for_mode (inner_mode, unsignedp); | |
2857 | if (inner_type) | |
2858 | return build_vector_type_for_mode (inner_type, mode); | |
2859 | } | |
2860 | ||
2861 | return NULL_TREE; | |
a1ab4c31 AC |
2862 | } |
2863 | ||
2864 | /* Return the unsigned version of a TYPE_NODE, a scalar type. */ | |
2865 | ||
2866 | tree | |
2867 | gnat_unsigned_type (tree type_node) | |
2868 | { | |
2869 | tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 1); | |
2870 | ||
2871 | if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node)) | |
2872 | { | |
2873 | type = copy_node (type); | |
2874 | TREE_TYPE (type) = type_node; | |
2875 | } | |
2876 | else if (TREE_TYPE (type_node) | |
2877 | && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE | |
2878 | && TYPE_MODULAR_P (TREE_TYPE (type_node))) | |
2879 | { | |
2880 | type = copy_node (type); | |
2881 | TREE_TYPE (type) = TREE_TYPE (type_node); | |
2882 | } | |
2883 | ||
2884 | return type; | |
2885 | } | |
2886 | ||
2887 | /* Return the signed version of a TYPE_NODE, a scalar type. */ | |
2888 | ||
2889 | tree | |
2890 | gnat_signed_type (tree type_node) | |
2891 | { | |
2892 | tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 0); | |
2893 | ||
2894 | if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node)) | |
2895 | { | |
2896 | type = copy_node (type); | |
2897 | TREE_TYPE (type) = type_node; | |
2898 | } | |
2899 | else if (TREE_TYPE (type_node) | |
2900 | && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE | |
2901 | && TYPE_MODULAR_P (TREE_TYPE (type_node))) | |
2902 | { | |
2903 | type = copy_node (type); | |
2904 | TREE_TYPE (type) = TREE_TYPE (type_node); | |
2905 | } | |
2906 | ||
2907 | return type; | |
2908 | } | |
2909 | ||
2910 | /* Return 1 if the types T1 and T2 are compatible, i.e. if they can be | |
2911 | transparently converted to each other. */ | |
2912 | ||
2913 | int | |
2914 | gnat_types_compatible_p (tree t1, tree t2) | |
2915 | { | |
2916 | enum tree_code code; | |
2917 | ||
2918 | /* This is the default criterion. */ | |
2919 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
2920 | return 1; | |
2921 | ||
2922 | /* We only check structural equivalence here. */ | |
2923 | if ((code = TREE_CODE (t1)) != TREE_CODE (t2)) | |
2924 | return 0; | |
2925 | ||
7948ae37 OH |
2926 | /* Vector types are also compatible if they have the same number of subparts |
2927 | and the same form of (scalar) element type. */ | |
2928 | if (code == VECTOR_TYPE | |
2929 | && TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2) | |
2930 | && TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2)) | |
2931 | && TYPE_PRECISION (TREE_TYPE (t1)) == TYPE_PRECISION (TREE_TYPE (t2))) | |
2932 | return 1; | |
2933 | ||
cfa0bd19 | 2934 | /* Array types are also compatible if they are constrained and have the same |
96bba5e6 | 2935 | domain(s) and the same component type. */ |
a1ab4c31 | 2936 | if (code == ARRAY_TYPE |
0adef32b JJ |
2937 | && (TYPE_DOMAIN (t1) == TYPE_DOMAIN (t2) |
2938 | || (TYPE_DOMAIN (t1) | |
b4680ca1 | 2939 | && TYPE_DOMAIN (t2) |
0adef32b JJ |
2940 | && tree_int_cst_equal (TYPE_MIN_VALUE (TYPE_DOMAIN (t1)), |
2941 | TYPE_MIN_VALUE (TYPE_DOMAIN (t2))) | |
2942 | && tree_int_cst_equal (TYPE_MAX_VALUE (TYPE_DOMAIN (t1)), | |
cfa0bd19 | 2943 | TYPE_MAX_VALUE (TYPE_DOMAIN (t2))))) |
96bba5e6 EB |
2944 | && (TREE_TYPE (t1) == TREE_TYPE (t2) |
2945 | || (TREE_CODE (TREE_TYPE (t1)) == ARRAY_TYPE | |
2946 | && gnat_types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2))))) | |
a1ab4c31 AC |
2947 | return 1; |
2948 | ||
a1ab4c31 AC |
2949 | return 0; |
2950 | } | |
523e82a7 | 2951 | |
71196d4e EB |
2952 | /* Return true if EXPR is a useless type conversion. */ |
2953 | ||
2954 | bool | |
2955 | gnat_useless_type_conversion (tree expr) | |
2956 | { | |
2957 | if (CONVERT_EXPR_P (expr) | |
2958 | || TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
2959 | || TREE_CODE (expr) == NON_LVALUE_EXPR) | |
2960 | return gnat_types_compatible_p (TREE_TYPE (expr), | |
2961 | TREE_TYPE (TREE_OPERAND (expr, 0))); | |
2962 | ||
2963 | return false; | |
2964 | } | |
2965 | ||
523e82a7 EB |
2966 | /* Return true if T, a FUNCTION_TYPE, has the specified list of flags. */ |
2967 | ||
2968 | bool | |
2969 | fntype_same_flags_p (const_tree t, tree cico_list, bool return_unconstrained_p, | |
2970 | bool return_by_direct_ref_p, bool return_by_invisi_ref_p) | |
2971 | { | |
2972 | return TYPE_CI_CO_LIST (t) == cico_list | |
2973 | && TYPE_RETURN_UNCONSTRAINED_P (t) == return_unconstrained_p | |
2974 | && TYPE_RETURN_BY_DIRECT_REF_P (t) == return_by_direct_ref_p | |
2975 | && TREE_ADDRESSABLE (t) == return_by_invisi_ref_p; | |
2976 | } | |
a1ab4c31 AC |
2977 | \f |
2978 | /* EXP is an expression for the size of an object. If this size contains | |
2979 | discriminant references, replace them with the maximum (if MAX_P) or | |
2980 | minimum (if !MAX_P) possible value of the discriminant. */ | |
2981 | ||
2982 | tree | |
2983 | max_size (tree exp, bool max_p) | |
2984 | { | |
2985 | enum tree_code code = TREE_CODE (exp); | |
2986 | tree type = TREE_TYPE (exp); | |
2987 | ||
2988 | switch (TREE_CODE_CLASS (code)) | |
2989 | { | |
2990 | case tcc_declaration: | |
2991 | case tcc_constant: | |
2992 | return exp; | |
2993 | ||
2994 | case tcc_vl_exp: | |
2995 | if (code == CALL_EXPR) | |
2996 | { | |
f82a627c EB |
2997 | tree t, *argarray; |
2998 | int n, i; | |
2999 | ||
3000 | t = maybe_inline_call_in_expr (exp); | |
3001 | if (t) | |
3002 | return max_size (t, max_p); | |
a1ab4c31 | 3003 | |
f82a627c EB |
3004 | n = call_expr_nargs (exp); |
3005 | gcc_assert (n > 0); | |
2bb1fc26 | 3006 | argarray = XALLOCAVEC (tree, n); |
a1ab4c31 AC |
3007 | for (i = 0; i < n; i++) |
3008 | argarray[i] = max_size (CALL_EXPR_ARG (exp, i), max_p); | |
3009 | return build_call_array (type, CALL_EXPR_FN (exp), n, argarray); | |
3010 | } | |
3011 | break; | |
3012 | ||
3013 | case tcc_reference: | |
3014 | /* If this contains a PLACEHOLDER_EXPR, it is the thing we want to | |
3015 | modify. Otherwise, we treat it like a variable. */ | |
3016 | if (!CONTAINS_PLACEHOLDER_P (exp)) | |
3017 | return exp; | |
3018 | ||
3019 | type = TREE_TYPE (TREE_OPERAND (exp, 1)); | |
3020 | return | |
3021 | max_size (max_p ? TYPE_MAX_VALUE (type) : TYPE_MIN_VALUE (type), true); | |
3022 | ||
3023 | case tcc_comparison: | |
3024 | return max_p ? size_one_node : size_zero_node; | |
3025 | ||
3026 | case tcc_unary: | |
ce3da0d0 EB |
3027 | if (code == NON_LVALUE_EXPR) |
3028 | return max_size (TREE_OPERAND (exp, 0), max_p); | |
3029 | ||
3030 | return fold_build1 (code, type, | |
3031 | max_size (TREE_OPERAND (exp, 0), | |
3032 | code == NEGATE_EXPR ? !max_p : max_p)); | |
3033 | ||
a1ab4c31 | 3034 | case tcc_binary: |
ce3da0d0 EB |
3035 | { |
3036 | tree lhs = max_size (TREE_OPERAND (exp, 0), max_p); | |
3037 | tree rhs = max_size (TREE_OPERAND (exp, 1), | |
3038 | code == MINUS_EXPR ? !max_p : max_p); | |
3039 | ||
3040 | /* Special-case wanting the maximum value of a MIN_EXPR. | |
3041 | In that case, if one side overflows, return the other. */ | |
3042 | if (max_p && code == MIN_EXPR) | |
3043 | { | |
3044 | if (TREE_CODE (rhs) == INTEGER_CST && TREE_OVERFLOW (rhs)) | |
3045 | return lhs; | |
3046 | ||
3047 | if (TREE_CODE (lhs) == INTEGER_CST && TREE_OVERFLOW (lhs)) | |
3048 | return rhs; | |
3049 | } | |
3050 | ||
3051 | /* Likewise, handle a MINUS_EXPR or PLUS_EXPR with the LHS | |
3052 | overflowing and the RHS a variable. */ | |
3053 | if ((code == MINUS_EXPR || code == PLUS_EXPR) | |
3054 | && TREE_CODE (lhs) == INTEGER_CST | |
3055 | && TREE_OVERFLOW (lhs) | |
3056 | && !TREE_CONSTANT (rhs)) | |
3057 | return lhs; | |
3058 | ||
3059 | return size_binop (code, lhs, rhs); | |
3060 | } | |
3061 | ||
a1ab4c31 AC |
3062 | case tcc_expression: |
3063 | switch (TREE_CODE_LENGTH (code)) | |
3064 | { | |
3065 | case 1: | |
722356ce EB |
3066 | if (code == SAVE_EXPR) |
3067 | return exp; | |
ce3da0d0 EB |
3068 | |
3069 | return fold_build1 (code, type, | |
3070 | max_size (TREE_OPERAND (exp, 0), max_p)); | |
a1ab4c31 AC |
3071 | |
3072 | case 2: | |
3073 | if (code == COMPOUND_EXPR) | |
3074 | return max_size (TREE_OPERAND (exp, 1), max_p); | |
3075 | ||
ce3da0d0 EB |
3076 | return fold_build2 (code, type, |
3077 | max_size (TREE_OPERAND (exp, 0), max_p), | |
3078 | max_size (TREE_OPERAND (exp, 1), max_p)); | |
a1ab4c31 AC |
3079 | |
3080 | case 3: | |
722356ce | 3081 | if (code == COND_EXPR) |
a1ab4c31 AC |
3082 | return fold_build2 (max_p ? MAX_EXPR : MIN_EXPR, type, |
3083 | max_size (TREE_OPERAND (exp, 1), max_p), | |
3084 | max_size (TREE_OPERAND (exp, 2), max_p)); | |
ce3da0d0 EB |
3085 | |
3086 | default: | |
3087 | break; | |
a1ab4c31 AC |
3088 | } |
3089 | ||
3090 | /* Other tree classes cannot happen. */ | |
3091 | default: | |
3092 | break; | |
3093 | } | |
3094 | ||
3095 | gcc_unreachable (); | |
3096 | } | |
3097 | \f | |
3098 | /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE. | |
3099 | EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs. | |
3100 | Return a constructor for the template. */ | |
3101 | ||
3102 | tree | |
3103 | build_template (tree template_type, tree array_type, tree expr) | |
3104 | { | |
9771b263 | 3105 | vec<constructor_elt, va_gc> *template_elts = NULL; |
a1ab4c31 AC |
3106 | tree bound_list = NULL_TREE; |
3107 | tree field; | |
3108 | ||
3109 | while (TREE_CODE (array_type) == RECORD_TYPE | |
315cff15 | 3110 | && (TYPE_PADDING_P (array_type) |
a1ab4c31 AC |
3111 | || TYPE_JUSTIFIED_MODULAR_P (array_type))) |
3112 | array_type = TREE_TYPE (TYPE_FIELDS (array_type)); | |
3113 | ||
3114 | if (TREE_CODE (array_type) == ARRAY_TYPE | |
3115 | || (TREE_CODE (array_type) == INTEGER_TYPE | |
3116 | && TYPE_HAS_ACTUAL_BOUNDS_P (array_type))) | |
3117 | bound_list = TYPE_ACTUAL_BOUNDS (array_type); | |
3118 | ||
3119 | /* First make the list for a CONSTRUCTOR for the template. Go down the | |
3120 | field list of the template instead of the type chain because this | |
3121 | array might be an Ada array of arrays and we can't tell where the | |
3122 | nested arrays stop being the underlying object. */ | |
3123 | ||
3124 | for (field = TYPE_FIELDS (template_type); field; | |
3125 | (bound_list | |
3126 | ? (bound_list = TREE_CHAIN (bound_list)) | |
3127 | : (array_type = TREE_TYPE (array_type))), | |
910ad8de | 3128 | field = DECL_CHAIN (DECL_CHAIN (field))) |
a1ab4c31 AC |
3129 | { |
3130 | tree bounds, min, max; | |
3131 | ||
3132 | /* If we have a bound list, get the bounds from there. Likewise | |
3133 | for an ARRAY_TYPE. Otherwise, if expr is a PARM_DECL with | |
3134 | DECL_BY_COMPONENT_PTR_P, use the bounds of the field in the template. | |
3135 | This will give us a maximum range. */ | |
3136 | if (bound_list) | |
3137 | bounds = TREE_VALUE (bound_list); | |
3138 | else if (TREE_CODE (array_type) == ARRAY_TYPE) | |
3139 | bounds = TYPE_INDEX_TYPE (TYPE_DOMAIN (array_type)); | |
3140 | else if (expr && TREE_CODE (expr) == PARM_DECL | |
3141 | && DECL_BY_COMPONENT_PTR_P (expr)) | |
3142 | bounds = TREE_TYPE (field); | |
3143 | else | |
3144 | gcc_unreachable (); | |
3145 | ||
3146 | min = convert (TREE_TYPE (field), TYPE_MIN_VALUE (bounds)); | |
910ad8de | 3147 | max = convert (TREE_TYPE (DECL_CHAIN (field)), TYPE_MAX_VALUE (bounds)); |
a1ab4c31 AC |
3148 | |
3149 | /* If either MIN or MAX involve a PLACEHOLDER_EXPR, we must | |
3150 | substitute it from OBJECT. */ | |
3151 | min = SUBSTITUTE_PLACEHOLDER_IN_EXPR (min, expr); | |
3152 | max = SUBSTITUTE_PLACEHOLDER_IN_EXPR (max, expr); | |
3153 | ||
0e228dd9 | 3154 | CONSTRUCTOR_APPEND_ELT (template_elts, field, min); |
910ad8de | 3155 | CONSTRUCTOR_APPEND_ELT (template_elts, DECL_CHAIN (field), max); |
a1ab4c31 AC |
3156 | } |
3157 | ||
0e228dd9 | 3158 | return gnat_build_constructor (template_type, template_elts); |
a1ab4c31 AC |
3159 | } |
3160 | \f | |
31a5a547 EB |
3161 | /* Helper routine to make a descriptor field. FIELD_LIST is the list of decls |
3162 | being built; the new decl is chained on to the front of the list. */ | |
3163 | ||
3164 | static tree | |
3165 | make_descriptor_field (const char *name, tree type, tree rec_type, | |
3166 | tree initial, tree field_list) | |
3167 | { | |
3168 | tree field | |
3169 | = create_field_decl (get_identifier (name), type, rec_type, NULL_TREE, | |
3170 | NULL_TREE, 0, 0); | |
3171 | ||
3172 | DECL_INITIAL (field) = initial; | |
3173 | DECL_CHAIN (field) = field_list; | |
3174 | return field; | |
3175 | } | |
3176 | ||
58c8f770 EB |
3177 | /* Build a 32-bit VMS descriptor from a Mechanism_Type, which must specify a |
3178 | descriptor type, and the GCC type of an object. Each FIELD_DECL in the | |
3179 | type contains in its DECL_INITIAL the expression to use when a constructor | |
3180 | is made for the type. GNAT_ENTITY is an entity used to print out an error | |
3181 | message if the mechanism cannot be applied to an object of that type and | |
3182 | also for the name. */ | |
a1ab4c31 AC |
3183 | |
3184 | tree | |
d628c015 | 3185 | build_vms_descriptor32 (tree type, Mechanism_Type mech, Entity_Id gnat_entity) |
a1ab4c31 AC |
3186 | { |
3187 | tree record_type = make_node (RECORD_TYPE); | |
31a5a547 | 3188 | tree pointer32_type, pointer64_type; |
788e5046 | 3189 | tree field_list = NULL_TREE; |
31a5a547 EB |
3190 | int klass, ndim, i, dtype = 0; |
3191 | tree inner_type, tem; | |
a1ab4c31 | 3192 | tree *idx_arr; |
a1ab4c31 AC |
3193 | |
3194 | /* If TYPE is an unconstrained array, use the underlying array type. */ | |
3195 | if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) | |
3196 | type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))); | |
3197 | ||
3198 | /* If this is an array, compute the number of dimensions in the array, | |
3199 | get the index types, and point to the inner type. */ | |
3200 | if (TREE_CODE (type) != ARRAY_TYPE) | |
3201 | ndim = 0; | |
3202 | else | |
3203 | for (ndim = 1, inner_type = type; | |
3204 | TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE | |
3205 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type)); | |
3206 | ndim++, inner_type = TREE_TYPE (inner_type)) | |
3207 | ; | |
3208 | ||
2bb1fc26 | 3209 | idx_arr = XALLOCAVEC (tree, ndim); |
a1ab4c31 | 3210 | |
d628c015 | 3211 | if (mech != By_Descriptor_NCA && mech != By_Short_Descriptor_NCA |
a1ab4c31 AC |
3212 | && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type)) |
3213 | for (i = ndim - 1, inner_type = type; | |
3214 | i >= 0; | |
3215 | i--, inner_type = TREE_TYPE (inner_type)) | |
3216 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
3217 | else | |
3218 | for (i = 0, inner_type = type; | |
3219 | i < ndim; | |
3220 | i++, inner_type = TREE_TYPE (inner_type)) | |
3221 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
3222 | ||
3223 | /* Now get the DTYPE value. */ | |
3224 | switch (TREE_CODE (type)) | |
3225 | { | |
3226 | case INTEGER_TYPE: | |
3227 | case ENUMERAL_TYPE: | |
01ddebf2 | 3228 | case BOOLEAN_TYPE: |
a1ab4c31 AC |
3229 | if (TYPE_VAX_FLOATING_POINT_P (type)) |
3230 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
3231 | { | |
3232 | case 6: | |
3233 | dtype = 10; | |
3234 | break; | |
3235 | case 9: | |
3236 | dtype = 11; | |
3237 | break; | |
3238 | case 15: | |
3239 | dtype = 27; | |
3240 | break; | |
3241 | } | |
3242 | else | |
3243 | switch (GET_MODE_BITSIZE (TYPE_MODE (type))) | |
3244 | { | |
3245 | case 8: | |
3246 | dtype = TYPE_UNSIGNED (type) ? 2 : 6; | |
3247 | break; | |
3248 | case 16: | |
3249 | dtype = TYPE_UNSIGNED (type) ? 3 : 7; | |
3250 | break; | |
3251 | case 32: | |
3252 | dtype = TYPE_UNSIGNED (type) ? 4 : 8; | |
3253 | break; | |
3254 | case 64: | |
3255 | dtype = TYPE_UNSIGNED (type) ? 5 : 9; | |
3256 | break; | |
3257 | case 128: | |
3258 | dtype = TYPE_UNSIGNED (type) ? 25 : 26; | |
3259 | break; | |
3260 | } | |
3261 | break; | |
3262 | ||
3263 | case REAL_TYPE: | |
3264 | dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53; | |
3265 | break; | |
3266 | ||
3267 | case COMPLEX_TYPE: | |
3268 | if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE | |
3269 | && TYPE_VAX_FLOATING_POINT_P (type)) | |
3270 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
3271 | { | |
3272 | case 6: | |
3273 | dtype = 12; | |
3274 | break; | |
3275 | case 9: | |
3276 | dtype = 13; | |
3277 | break; | |
3278 | case 15: | |
3279 | dtype = 29; | |
3280 | } | |
3281 | else | |
3282 | dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55; | |
3283 | break; | |
3284 | ||
3285 | case ARRAY_TYPE: | |
3286 | dtype = 14; | |
3287 | break; | |
3288 | ||
3289 | default: | |
3290 | break; | |
3291 | } | |
3292 | ||
3293 | /* Get the CLASS value. */ | |
3294 | switch (mech) | |
3295 | { | |
3296 | case By_Descriptor_A: | |
d628c015 | 3297 | case By_Short_Descriptor_A: |
c6bd4220 | 3298 | klass = 4; |
a1ab4c31 AC |
3299 | break; |
3300 | case By_Descriptor_NCA: | |
d628c015 | 3301 | case By_Short_Descriptor_NCA: |
c6bd4220 | 3302 | klass = 10; |
a1ab4c31 AC |
3303 | break; |
3304 | case By_Descriptor_SB: | |
d628c015 | 3305 | case By_Short_Descriptor_SB: |
c6bd4220 | 3306 | klass = 15; |
a1ab4c31 AC |
3307 | break; |
3308 | case By_Descriptor: | |
d628c015 | 3309 | case By_Short_Descriptor: |
a1ab4c31 | 3310 | case By_Descriptor_S: |
d628c015 | 3311 | case By_Short_Descriptor_S: |
a1ab4c31 | 3312 | default: |
c6bd4220 | 3313 | klass = 1; |
a1ab4c31 AC |
3314 | break; |
3315 | } | |
3316 | ||
58c8f770 EB |
3317 | /* Make the type for a descriptor for VMS. The first four fields are the |
3318 | same for all types. */ | |
82b481ed EB |
3319 | field_list |
3320 | = make_descriptor_field ("LENGTH", gnat_type_for_size (16, 1), record_type, | |
3321 | size_in_bytes ((mech == By_Descriptor_A | |
3322 | || mech == By_Short_Descriptor_A) | |
3323 | ? inner_type : type), | |
3324 | field_list); | |
3325 | field_list | |
3326 | = make_descriptor_field ("DTYPE", gnat_type_for_size (8, 1), record_type, | |
3327 | size_int (dtype), field_list); | |
3328 | field_list | |
3329 | = make_descriptor_field ("CLASS", gnat_type_for_size (8, 1), record_type, | |
3330 | size_int (klass), field_list); | |
a1ab4c31 | 3331 | |
a1ab4c31 | 3332 | pointer32_type = build_pointer_type_for_mode (type, SImode, false); |
31a5a547 EB |
3333 | pointer64_type = build_pointer_type_for_mode (type, DImode, false); |
3334 | ||
3335 | /* Ensure that only 32-bit pointers are passed in 32-bit descriptors. Note | |
3336 | that we cannot build a template call to the CE routine as it would get a | |
3337 | wrong source location; instead we use a second placeholder for it. */ | |
3338 | tem = build_unary_op (ADDR_EXPR, pointer64_type, | |
3339 | build0 (PLACEHOLDER_EXPR, type)); | |
3340 | tem = build3 (COND_EXPR, pointer32_type, | |
f542c405 EB |
3341 | Pmode != SImode |
3342 | ? build_binary_op (GE_EXPR, boolean_type_node, tem, | |
3343 | build_int_cstu (pointer64_type, 0x80000000)) | |
3344 | : boolean_false_node, | |
31a5a547 EB |
3345 | build0 (PLACEHOLDER_EXPR, void_type_node), |
3346 | convert (pointer32_type, tem)); | |
a1ab4c31 | 3347 | |
82b481ed | 3348 | field_list |
31a5a547 | 3349 | = make_descriptor_field ("POINTER", pointer32_type, record_type, tem, |
82b481ed | 3350 | field_list); |
a1ab4c31 AC |
3351 | |
3352 | switch (mech) | |
3353 | { | |
3354 | case By_Descriptor: | |
d628c015 | 3355 | case By_Short_Descriptor: |
a1ab4c31 | 3356 | case By_Descriptor_S: |
d628c015 | 3357 | case By_Short_Descriptor_S: |
a1ab4c31 AC |
3358 | break; |
3359 | ||
3360 | case By_Descriptor_SB: | |
d628c015 | 3361 | case By_Short_Descriptor_SB: |
82b481ed EB |
3362 | field_list |
3363 | = make_descriptor_field ("SB_L1", gnat_type_for_size (32, 1), | |
3364 | record_type, | |
3365 | (TREE_CODE (type) == ARRAY_TYPE | |
3366 | ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) | |
3367 | : size_zero_node), | |
3368 | field_list); | |
3369 | field_list | |
3370 | = make_descriptor_field ("SB_U1", gnat_type_for_size (32, 1), | |
3371 | record_type, | |
3372 | (TREE_CODE (type) == ARRAY_TYPE | |
3373 | ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
3374 | : size_zero_node), | |
3375 | field_list); | |
a1ab4c31 AC |
3376 | break; |
3377 | ||
3378 | case By_Descriptor_A: | |
d628c015 | 3379 | case By_Short_Descriptor_A: |
a1ab4c31 | 3380 | case By_Descriptor_NCA: |
d628c015 | 3381 | case By_Short_Descriptor_NCA: |
82b481ed EB |
3382 | field_list |
3383 | = make_descriptor_field ("SCALE", gnat_type_for_size (8, 1), | |
3384 | record_type, size_zero_node, field_list); | |
3385 | ||
3386 | field_list | |
3387 | = make_descriptor_field ("DIGITS", gnat_type_for_size (8, 1), | |
3388 | record_type, size_zero_node, field_list); | |
3389 | ||
82b481ed EB |
3390 | field_list |
3391 | = make_descriptor_field ("AFLAGS", gnat_type_for_size (8, 1), | |
3392 | record_type, | |
3393 | size_int ((mech == By_Descriptor_NCA | |
3394 | || mech == By_Short_Descriptor_NCA) | |
3395 | ? 0 | |
3396 | /* Set FL_COLUMN, FL_COEFF, and | |
3397 | FL_BOUNDS. */ | |
3398 | : (TREE_CODE (type) == ARRAY_TYPE | |
3399 | && TYPE_CONVENTION_FORTRAN_P | |
3400 | (type) | |
3401 | ? 224 : 192)), | |
3402 | field_list); | |
3403 | ||
3404 | field_list | |
3405 | = make_descriptor_field ("DIMCT", gnat_type_for_size (8, 1), | |
3406 | record_type, size_int (ndim), field_list); | |
3407 | ||
3408 | field_list | |
3409 | = make_descriptor_field ("ARSIZE", gnat_type_for_size (32, 1), | |
3410 | record_type, size_in_bytes (type), | |
3411 | field_list); | |
a1ab4c31 AC |
3412 | |
3413 | /* Now build a pointer to the 0,0,0... element. */ | |
3414 | tem = build0 (PLACEHOLDER_EXPR, type); | |
3415 | for (i = 0, inner_type = type; i < ndim; | |
3416 | i++, inner_type = TREE_TYPE (inner_type)) | |
3417 | tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem, | |
3418 | convert (TYPE_DOMAIN (inner_type), size_zero_node), | |
3419 | NULL_TREE, NULL_TREE); | |
3420 | ||
82b481ed EB |
3421 | field_list |
3422 | = make_descriptor_field ("A0", pointer32_type, record_type, | |
3423 | build1 (ADDR_EXPR, pointer32_type, tem), | |
3424 | field_list); | |
a1ab4c31 AC |
3425 | |
3426 | /* Next come the addressing coefficients. */ | |
3427 | tem = size_one_node; | |
3428 | for (i = 0; i < ndim; i++) | |
3429 | { | |
3430 | char fname[3]; | |
3431 | tree idx_length | |
3432 | = size_binop (MULT_EXPR, tem, | |
3433 | size_binop (PLUS_EXPR, | |
3434 | size_binop (MINUS_EXPR, | |
3435 | TYPE_MAX_VALUE (idx_arr[i]), | |
3436 | TYPE_MIN_VALUE (idx_arr[i])), | |
3437 | size_int (1))); | |
3438 | ||
d628c015 DR |
3439 | fname[0] = ((mech == By_Descriptor_NCA || |
3440 | mech == By_Short_Descriptor_NCA) ? 'S' : 'M'); | |
a1ab4c31 | 3441 | fname[1] = '0' + i, fname[2] = 0; |
82b481ed EB |
3442 | field_list |
3443 | = make_descriptor_field (fname, gnat_type_for_size (32, 1), | |
3444 | record_type, idx_length, field_list); | |
a1ab4c31 | 3445 | |
d628c015 | 3446 | if (mech == By_Descriptor_NCA || mech == By_Short_Descriptor_NCA) |
a1ab4c31 AC |
3447 | tem = idx_length; |
3448 | } | |
3449 | ||
3450 | /* Finally here are the bounds. */ | |
3451 | for (i = 0; i < ndim; i++) | |
3452 | { | |
3453 | char fname[3]; | |
3454 | ||
3455 | fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0; | |
82b481ed EB |
3456 | field_list |
3457 | = make_descriptor_field (fname, gnat_type_for_size (32, 1), | |
3458 | record_type, TYPE_MIN_VALUE (idx_arr[i]), | |
3459 | field_list); | |
a1ab4c31 AC |
3460 | |
3461 | fname[0] = 'U'; | |
82b481ed EB |
3462 | field_list |
3463 | = make_descriptor_field (fname, gnat_type_for_size (32, 1), | |
3464 | record_type, TYPE_MAX_VALUE (idx_arr[i]), | |
3465 | field_list); | |
a1ab4c31 AC |
3466 | } |
3467 | break; | |
3468 | ||
3469 | default: | |
3470 | post_error ("unsupported descriptor type for &", gnat_entity); | |
3471 | } | |
3472 | ||
10069d53 | 3473 | TYPE_NAME (record_type) = create_concat_name (gnat_entity, "DESC"); |
788e5046 | 3474 | finish_record_type (record_type, nreverse (field_list), 0, false); |
a1ab4c31 AC |
3475 | return record_type; |
3476 | } | |
3477 | ||
58c8f770 EB |
3478 | /* Build a 64-bit VMS descriptor from a Mechanism_Type, which must specify a |
3479 | descriptor type, and the GCC type of an object. Each FIELD_DECL in the | |
3480 | type contains in its DECL_INITIAL the expression to use when a constructor | |
3481 | is made for the type. GNAT_ENTITY is an entity used to print out an error | |
3482 | message if the mechanism cannot be applied to an object of that type and | |
3483 | also for the name. */ | |
6ca2b0a0 DR |
3484 | |
3485 | tree | |
d628c015 | 3486 | build_vms_descriptor (tree type, Mechanism_Type mech, Entity_Id gnat_entity) |
6ca2b0a0 | 3487 | { |
31a5a547 | 3488 | tree record_type = make_node (RECORD_TYPE); |
6ca2b0a0 | 3489 | tree pointer64_type; |
31a5a547 EB |
3490 | tree field_list = NULL_TREE; |
3491 | int klass, ndim, i, dtype = 0; | |
3492 | tree inner_type, tem; | |
6ca2b0a0 | 3493 | tree *idx_arr; |
6ca2b0a0 DR |
3494 | |
3495 | /* If TYPE is an unconstrained array, use the underlying array type. */ | |
3496 | if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) | |
3497 | type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))); | |
3498 | ||
3499 | /* If this is an array, compute the number of dimensions in the array, | |
3500 | get the index types, and point to the inner type. */ | |
3501 | if (TREE_CODE (type) != ARRAY_TYPE) | |
3502 | ndim = 0; | |
3503 | else | |
3504 | for (ndim = 1, inner_type = type; | |
3505 | TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE | |
3506 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type)); | |
3507 | ndim++, inner_type = TREE_TYPE (inner_type)) | |
3508 | ; | |
3509 | ||
2bb1fc26 | 3510 | idx_arr = XALLOCAVEC (tree, ndim); |
6ca2b0a0 DR |
3511 | |
3512 | if (mech != By_Descriptor_NCA | |
3513 | && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type)) | |
3514 | for (i = ndim - 1, inner_type = type; | |
3515 | i >= 0; | |
3516 | i--, inner_type = TREE_TYPE (inner_type)) | |
3517 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
3518 | else | |
3519 | for (i = 0, inner_type = type; | |
3520 | i < ndim; | |
3521 | i++, inner_type = TREE_TYPE (inner_type)) | |
3522 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
3523 | ||
3524 | /* Now get the DTYPE value. */ | |
3525 | switch (TREE_CODE (type)) | |
3526 | { | |
3527 | case INTEGER_TYPE: | |
3528 | case ENUMERAL_TYPE: | |
01ddebf2 | 3529 | case BOOLEAN_TYPE: |
6ca2b0a0 DR |
3530 | if (TYPE_VAX_FLOATING_POINT_P (type)) |
3531 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
3532 | { | |
3533 | case 6: | |
3534 | dtype = 10; | |
3535 | break; | |
3536 | case 9: | |
3537 | dtype = 11; | |
3538 | break; | |
3539 | case 15: | |
3540 | dtype = 27; | |
3541 | break; | |
3542 | } | |
3543 | else | |
3544 | switch (GET_MODE_BITSIZE (TYPE_MODE (type))) | |
3545 | { | |
3546 | case 8: | |
3547 | dtype = TYPE_UNSIGNED (type) ? 2 : 6; | |
3548 | break; | |
3549 | case 16: | |
3550 | dtype = TYPE_UNSIGNED (type) ? 3 : 7; | |
3551 | break; | |
3552 | case 32: | |
3553 | dtype = TYPE_UNSIGNED (type) ? 4 : 8; | |
3554 | break; | |
3555 | case 64: | |
3556 | dtype = TYPE_UNSIGNED (type) ? 5 : 9; | |
3557 | break; | |
3558 | case 128: | |
3559 | dtype = TYPE_UNSIGNED (type) ? 25 : 26; | |
3560 | break; | |
3561 | } | |
3562 | break; | |
3563 | ||
3564 | case REAL_TYPE: | |
3565 | dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53; | |
3566 | break; | |
3567 | ||
3568 | case COMPLEX_TYPE: | |
3569 | if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE | |
3570 | && TYPE_VAX_FLOATING_POINT_P (type)) | |
3571 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
3572 | { | |
3573 | case 6: | |
3574 | dtype = 12; | |
3575 | break; | |
3576 | case 9: | |
3577 | dtype = 13; | |
3578 | break; | |
3579 | case 15: | |
3580 | dtype = 29; | |
3581 | } | |
3582 | else | |
3583 | dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55; | |
3584 | break; | |
3585 | ||
3586 | case ARRAY_TYPE: | |
3587 | dtype = 14; | |
3588 | break; | |
3589 | ||
3590 | default: | |
3591 | break; | |
3592 | } | |
3593 | ||
3594 | /* Get the CLASS value. */ | |
3595 | switch (mech) | |
3596 | { | |
3597 | case By_Descriptor_A: | |
c6bd4220 | 3598 | klass = 4; |
6ca2b0a0 DR |
3599 | break; |
3600 | case By_Descriptor_NCA: | |
c6bd4220 | 3601 | klass = 10; |
6ca2b0a0 DR |
3602 | break; |
3603 | case By_Descriptor_SB: | |
c6bd4220 | 3604 | klass = 15; |
6ca2b0a0 DR |
3605 | break; |
3606 | case By_Descriptor: | |
3607 | case By_Descriptor_S: | |
3608 | default: | |
c6bd4220 | 3609 | klass = 1; |
6ca2b0a0 DR |
3610 | break; |
3611 | } | |
3612 | ||
58c8f770 | 3613 | /* Make the type for a 64-bit descriptor for VMS. The first six fields |
6ca2b0a0 | 3614 | are the same for all types. */ |
31a5a547 | 3615 | field_list |
788e5046 | 3616 | = make_descriptor_field ("MBO", gnat_type_for_size (16, 1), |
31a5a547 EB |
3617 | record_type, size_int (1), field_list); |
3618 | field_list | |
788e5046 | 3619 | = make_descriptor_field ("DTYPE", gnat_type_for_size (8, 1), |
31a5a547 EB |
3620 | record_type, size_int (dtype), field_list); |
3621 | field_list | |
788e5046 | 3622 | = make_descriptor_field ("CLASS", gnat_type_for_size (8, 1), |
31a5a547 EB |
3623 | record_type, size_int (klass), field_list); |
3624 | field_list | |
788e5046 | 3625 | = make_descriptor_field ("MBMO", gnat_type_for_size (32, 1), |
f54ee980 | 3626 | record_type, size_int (-1), field_list); |
31a5a547 | 3627 | field_list |
788e5046 | 3628 | = make_descriptor_field ("LENGTH", gnat_type_for_size (64, 1), |
31a5a547 | 3629 | record_type, |
788e5046 | 3630 | size_in_bytes (mech == By_Descriptor_A |
82b481ed | 3631 | ? inner_type : type), |
31a5a547 | 3632 | field_list); |
6ca2b0a0 DR |
3633 | |
3634 | pointer64_type = build_pointer_type_for_mode (type, DImode, false); | |
3635 | ||
31a5a547 EB |
3636 | field_list |
3637 | = make_descriptor_field ("POINTER", pointer64_type, record_type, | |
788e5046 | 3638 | build_unary_op (ADDR_EXPR, pointer64_type, |
82b481ed | 3639 | build0 (PLACEHOLDER_EXPR, type)), |
31a5a547 | 3640 | field_list); |
6ca2b0a0 DR |
3641 | |
3642 | switch (mech) | |
3643 | { | |
3644 | case By_Descriptor: | |
3645 | case By_Descriptor_S: | |
3646 | break; | |
3647 | ||
3648 | case By_Descriptor_SB: | |
31a5a547 | 3649 | field_list |
788e5046 | 3650 | = make_descriptor_field ("SB_L1", gnat_type_for_size (64, 1), |
31a5a547 | 3651 | record_type, |
788e5046 NF |
3652 | (TREE_CODE (type) == ARRAY_TYPE |
3653 | ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) | |
82b481ed | 3654 | : size_zero_node), |
31a5a547 EB |
3655 | field_list); |
3656 | field_list | |
788e5046 | 3657 | = make_descriptor_field ("SB_U1", gnat_type_for_size (64, 1), |
31a5a547 | 3658 | record_type, |
788e5046 NF |
3659 | (TREE_CODE (type) == ARRAY_TYPE |
3660 | ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
82b481ed | 3661 | : size_zero_node), |
31a5a547 | 3662 | field_list); |
6ca2b0a0 DR |
3663 | break; |
3664 | ||
3665 | case By_Descriptor_A: | |
3666 | case By_Descriptor_NCA: | |
31a5a547 | 3667 | field_list |
788e5046 | 3668 | = make_descriptor_field ("SCALE", gnat_type_for_size (8, 1), |
31a5a547 | 3669 | record_type, size_zero_node, field_list); |
788e5046 | 3670 | |
31a5a547 | 3671 | field_list |
788e5046 | 3672 | = make_descriptor_field ("DIGITS", gnat_type_for_size (8, 1), |
31a5a547 | 3673 | record_type, size_zero_node, field_list); |
788e5046 NF |
3674 | |
3675 | dtype = (mech == By_Descriptor_NCA | |
3676 | ? 0 | |
3677 | /* Set FL_COLUMN, FL_COEFF, and | |
3678 | FL_BOUNDS. */ | |
3679 | : (TREE_CODE (type) == ARRAY_TYPE | |
3680 | && TYPE_CONVENTION_FORTRAN_P (type) | |
3681 | ? 224 : 192)); | |
31a5a547 | 3682 | field_list |
788e5046 | 3683 | = make_descriptor_field ("AFLAGS", gnat_type_for_size (8, 1), |
31a5a547 EB |
3684 | record_type, size_int (dtype), |
3685 | field_list); | |
6ca2b0a0 | 3686 | |
31a5a547 | 3687 | field_list |
788e5046 | 3688 | = make_descriptor_field ("DIMCT", gnat_type_for_size (8, 1), |
31a5a547 | 3689 | record_type, size_int (ndim), field_list); |
788e5046 | 3690 | |
31a5a547 | 3691 | field_list |
788e5046 | 3692 | = make_descriptor_field ("MBZ", gnat_type_for_size (32, 1), |
31a5a547 EB |
3693 | record_type, size_int (0), field_list); |
3694 | field_list | |
788e5046 | 3695 | = make_descriptor_field ("ARSIZE", gnat_type_for_size (64, 1), |
31a5a547 EB |
3696 | record_type, size_in_bytes (type), |
3697 | field_list); | |
6ca2b0a0 DR |
3698 | |
3699 | /* Now build a pointer to the 0,0,0... element. */ | |
3700 | tem = build0 (PLACEHOLDER_EXPR, type); | |
3701 | for (i = 0, inner_type = type; i < ndim; | |
3702 | i++, inner_type = TREE_TYPE (inner_type)) | |
3703 | tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem, | |
3704 | convert (TYPE_DOMAIN (inner_type), size_zero_node), | |
3705 | NULL_TREE, NULL_TREE); | |
3706 | ||
31a5a547 EB |
3707 | field_list |
3708 | = make_descriptor_field ("A0", pointer64_type, record_type, | |
788e5046 | 3709 | build1 (ADDR_EXPR, pointer64_type, tem), |
31a5a547 | 3710 | field_list); |
6ca2b0a0 DR |
3711 | |
3712 | /* Next come the addressing coefficients. */ | |
3713 | tem = size_one_node; | |
3714 | for (i = 0; i < ndim; i++) | |
3715 | { | |
3716 | char fname[3]; | |
3717 | tree idx_length | |
3718 | = size_binop (MULT_EXPR, tem, | |
3719 | size_binop (PLUS_EXPR, | |
3720 | size_binop (MINUS_EXPR, | |
3721 | TYPE_MAX_VALUE (idx_arr[i]), | |
3722 | TYPE_MIN_VALUE (idx_arr[i])), | |
3723 | size_int (1))); | |
3724 | ||
3725 | fname[0] = (mech == By_Descriptor_NCA ? 'S' : 'M'); | |
3726 | fname[1] = '0' + i, fname[2] = 0; | |
31a5a547 | 3727 | field_list |
788e5046 | 3728 | = make_descriptor_field (fname, gnat_type_for_size (64, 1), |
31a5a547 | 3729 | record_type, idx_length, field_list); |
6ca2b0a0 DR |
3730 | |
3731 | if (mech == By_Descriptor_NCA) | |
3732 | tem = idx_length; | |
3733 | } | |
3734 | ||
3735 | /* Finally here are the bounds. */ | |
3736 | for (i = 0; i < ndim; i++) | |
3737 | { | |
3738 | char fname[3]; | |
3739 | ||
3740 | fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0; | |
31a5a547 | 3741 | field_list |
788e5046 | 3742 | = make_descriptor_field (fname, gnat_type_for_size (64, 1), |
31a5a547 EB |
3743 | record_type, |
3744 | TYPE_MIN_VALUE (idx_arr[i]), field_list); | |
6ca2b0a0 DR |
3745 | |
3746 | fname[0] = 'U'; | |
31a5a547 | 3747 | field_list |
788e5046 | 3748 | = make_descriptor_field (fname, gnat_type_for_size (64, 1), |
31a5a547 EB |
3749 | record_type, |
3750 | TYPE_MAX_VALUE (idx_arr[i]), field_list); | |
6ca2b0a0 DR |
3751 | } |
3752 | break; | |
3753 | ||
3754 | default: | |
3755 | post_error ("unsupported descriptor type for &", gnat_entity); | |
3756 | } | |
3757 | ||
31a5a547 EB |
3758 | TYPE_NAME (record_type) = create_concat_name (gnat_entity, "DESC64"); |
3759 | finish_record_type (record_type, nreverse (field_list), 0, false); | |
3760 | return record_type; | |
6ca2b0a0 DR |
3761 | } |
3762 | ||
31a5a547 EB |
3763 | /* Fill in a VMS descriptor of GNU_TYPE for GNU_EXPR and return the result. |
3764 | GNAT_ACTUAL is the actual parameter for which the descriptor is built. */ | |
a1ab4c31 | 3765 | |
31a5a547 EB |
3766 | tree |
3767 | fill_vms_descriptor (tree gnu_type, tree gnu_expr, Node_Id gnat_actual) | |
a1ab4c31 | 3768 | { |
9771b263 | 3769 | vec<constructor_elt, va_gc> *v = NULL; |
31a5a547 | 3770 | tree field; |
a1ab4c31 | 3771 | |
31a5a547 EB |
3772 | gnu_expr = maybe_unconstrained_array (gnu_expr); |
3773 | gnu_expr = gnat_protect_expr (gnu_expr); | |
3774 | gnat_mark_addressable (gnu_expr); | |
3775 | ||
3776 | /* We may need to substitute both GNU_EXPR and a CALL_EXPR to the raise CE | |
3777 | routine in case we have a 32-bit descriptor. */ | |
3778 | gnu_expr = build2 (COMPOUND_EXPR, void_type_node, | |
3779 | build_call_raise (CE_Range_Check_Failed, gnat_actual, | |
3780 | N_Raise_Constraint_Error), | |
3781 | gnu_expr); | |
3782 | ||
3783 | for (field = TYPE_FIELDS (gnu_type); field; field = DECL_CHAIN (field)) | |
3784 | { | |
3785 | tree value | |
3786 | = convert (TREE_TYPE (field), | |
3787 | SUBSTITUTE_PLACEHOLDER_IN_EXPR (DECL_INITIAL (field), | |
3788 | gnu_expr)); | |
3789 | CONSTRUCTOR_APPEND_ELT (v, field, value); | |
3790 | } | |
3791 | ||
3792 | return gnat_build_constructor (gnu_type, v); | |
a1ab4c31 AC |
3793 | } |
3794 | ||
d628c015 DR |
3795 | /* Convert GNU_EXPR, a pointer to a 64bit VMS descriptor, to GNU_TYPE, a |
3796 | regular pointer or fat pointer type. GNAT_SUBPROG is the subprogram to | |
3797 | which the VMS descriptor is passed. */ | |
a1ab4c31 AC |
3798 | |
3799 | static tree | |
d628c015 DR |
3800 | convert_vms_descriptor64 (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog) |
3801 | { | |
3802 | tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); | |
3803 | tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); | |
3804 | /* The CLASS field is the 3rd field in the descriptor. */ | |
910ad8de | 3805 | tree klass = DECL_CHAIN (DECL_CHAIN (TYPE_FIELDS (desc_type))); |
d628c015 | 3806 | /* The POINTER field is the 6th field in the descriptor. */ |
910ad8de | 3807 | tree pointer = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (klass))); |
d628c015 DR |
3808 | |
3809 | /* Retrieve the value of the POINTER field. */ | |
3810 | tree gnu_expr64 | |
58c8f770 | 3811 | = build3 (COMPONENT_REF, TREE_TYPE (pointer), desc, pointer, NULL_TREE); |
d628c015 DR |
3812 | |
3813 | if (POINTER_TYPE_P (gnu_type)) | |
3814 | return convert (gnu_type, gnu_expr64); | |
3815 | ||
315cff15 | 3816 | else if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
d628c015 DR |
3817 | { |
3818 | tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type)); | |
7d76717d | 3819 | tree p_bounds_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type))); |
d628c015 DR |
3820 | tree template_type = TREE_TYPE (p_bounds_type); |
3821 | tree min_field = TYPE_FIELDS (template_type); | |
7d76717d | 3822 | tree max_field = DECL_CHAIN (TYPE_FIELDS (template_type)); |
6bf68a93 | 3823 | tree template_tree, template_addr, aflags, dimct, t, u; |
d628c015 | 3824 | /* See the head comment of build_vms_descriptor. */ |
c6bd4220 | 3825 | int iklass = TREE_INT_CST_LOW (DECL_INITIAL (klass)); |
d628c015 | 3826 | tree lfield, ufield; |
9771b263 | 3827 | vec<constructor_elt, va_gc> *v; |
d628c015 | 3828 | |
86060344 | 3829 | /* Convert POINTER to the pointer-to-array type. */ |
d628c015 DR |
3830 | gnu_expr64 = convert (p_array_type, gnu_expr64); |
3831 | ||
c6bd4220 | 3832 | switch (iklass) |
d628c015 DR |
3833 | { |
3834 | case 1: /* Class S */ | |
3835 | case 15: /* Class SB */ | |
3836 | /* Build {1, LENGTH} template; LENGTH64 is the 5th field. */ | |
9771b263 | 3837 | vec_alloc (v, 2); |
910ad8de | 3838 | t = DECL_CHAIN (DECL_CHAIN (klass)); |
d628c015 | 3839 | t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
0e228dd9 NF |
3840 | CONSTRUCTOR_APPEND_ELT (v, min_field, |
3841 | convert (TREE_TYPE (min_field), | |
3842 | integer_one_node)); | |
3843 | CONSTRUCTOR_APPEND_ELT (v, max_field, | |
3844 | convert (TREE_TYPE (max_field), t)); | |
3845 | template_tree = gnat_build_constructor (template_type, v); | |
6bf68a93 | 3846 | template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template_tree); |
d628c015 DR |
3847 | |
3848 | /* For class S, we are done. */ | |
c6bd4220 | 3849 | if (iklass == 1) |
d628c015 DR |
3850 | break; |
3851 | ||
3852 | /* Test that we really have a SB descriptor, like DEC Ada. */ | |
c6bd4220 EB |
3853 | t = build3 (COMPONENT_REF, TREE_TYPE (klass), desc, klass, NULL); |
3854 | u = convert (TREE_TYPE (klass), DECL_INITIAL (klass)); | |
1139f2e8 | 3855 | u = build_binary_op (EQ_EXPR, boolean_type_node, t, u); |
d628c015 DR |
3856 | /* If so, there is already a template in the descriptor and |
3857 | it is located right after the POINTER field. The fields are | |
3858 | 64bits so they must be repacked. */ | |
7d76717d | 3859 | t = DECL_CHAIN (pointer); |
d628c015 DR |
3860 | lfield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3861 | lfield = convert (TREE_TYPE (TYPE_FIELDS (template_type)), lfield); | |
3862 | ||
7d76717d | 3863 | t = DECL_CHAIN (t); |
d628c015 DR |
3864 | ufield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3865 | ufield = convert | |
910ad8de | 3866 | (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (template_type))), ufield); |
d628c015 DR |
3867 | |
3868 | /* Build the template in the form of a constructor. */ | |
9771b263 | 3869 | vec_alloc (v, 2); |
0e228dd9 | 3870 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (template_type), lfield); |
7d76717d | 3871 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (template_type)), |
0e228dd9 NF |
3872 | ufield); |
3873 | template_tree = gnat_build_constructor (template_type, v); | |
d628c015 DR |
3874 | |
3875 | /* Otherwise use the {1, LENGTH} template we build above. */ | |
3876 | template_addr = build3 (COND_EXPR, p_bounds_type, u, | |
3877 | build_unary_op (ADDR_EXPR, p_bounds_type, | |
6bf68a93 | 3878 | template_tree), |
d628c015 DR |
3879 | template_addr); |
3880 | break; | |
3881 | ||
3882 | case 4: /* Class A */ | |
3883 | /* The AFLAGS field is the 3rd field after the pointer in the | |
3884 | descriptor. */ | |
910ad8de | 3885 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (pointer))); |
d628c015 DR |
3886 | aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3887 | /* The DIMCT field is the next field in the descriptor after | |
3888 | aflags. */ | |
7d76717d | 3889 | t = DECL_CHAIN (t); |
d628c015 DR |
3890 | dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3891 | /* Raise CONSTRAINT_ERROR if either more than 1 dimension | |
3892 | or FL_COEFF or FL_BOUNDS not set. */ | |
3893 | u = build_int_cst (TREE_TYPE (aflags), 192); | |
1139f2e8 EB |
3894 | u = build_binary_op (TRUTH_OR_EXPR, boolean_type_node, |
3895 | build_binary_op (NE_EXPR, boolean_type_node, | |
d628c015 DR |
3896 | dimct, |
3897 | convert (TREE_TYPE (dimct), | |
3898 | size_one_node)), | |
1139f2e8 | 3899 | build_binary_op (NE_EXPR, boolean_type_node, |
d628c015 DR |
3900 | build2 (BIT_AND_EXPR, |
3901 | TREE_TYPE (aflags), | |
3902 | aflags, u), | |
3903 | u)); | |
3904 | /* There is already a template in the descriptor and it is located | |
3905 | in block 3. The fields are 64bits so they must be repacked. */ | |
910ad8de | 3906 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (DECL_CHAIN |
d628c015 DR |
3907 | (t))))); |
3908 | lfield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
3909 | lfield = convert (TREE_TYPE (TYPE_FIELDS (template_type)), lfield); | |
3910 | ||
7d76717d | 3911 | t = DECL_CHAIN (t); |
d628c015 DR |
3912 | ufield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3913 | ufield = convert | |
910ad8de | 3914 | (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (template_type))), ufield); |
d628c015 DR |
3915 | |
3916 | /* Build the template in the form of a constructor. */ | |
9771b263 | 3917 | vec_alloc (v, 2); |
0e228dd9 | 3918 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (template_type), lfield); |
910ad8de | 3919 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (template_type)), |
0e228dd9 NF |
3920 | ufield); |
3921 | template_tree = gnat_build_constructor (template_type, v); | |
f76d6e6f | 3922 | template_tree = build3 (COND_EXPR, template_type, u, |
d628c015 DR |
3923 | build_call_raise (CE_Length_Check_Failed, Empty, |
3924 | N_Raise_Constraint_Error), | |
6bf68a93 | 3925 | template_tree); |
c6bd4220 EB |
3926 | template_addr |
3927 | = build_unary_op (ADDR_EXPR, p_bounds_type, template_tree); | |
d628c015 DR |
3928 | break; |
3929 | ||
3930 | case 10: /* Class NCA */ | |
3931 | default: | |
3932 | post_error ("unsupported descriptor type for &", gnat_subprog); | |
3933 | template_addr = integer_zero_node; | |
3934 | break; | |
3935 | } | |
3936 | ||
3937 | /* Build the fat pointer in the form of a constructor. */ | |
9771b263 | 3938 | vec_alloc (v, 2); |
0e228dd9 | 3939 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (gnu_type), gnu_expr64); |
910ad8de | 3940 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (gnu_type)), |
0e228dd9 NF |
3941 | template_addr); |
3942 | return gnat_build_constructor (gnu_type, v); | |
d628c015 DR |
3943 | } |
3944 | ||
3945 | else | |
3946 | gcc_unreachable (); | |
3947 | } | |
3948 | ||
3949 | /* Convert GNU_EXPR, a pointer to a 32bit VMS descriptor, to GNU_TYPE, a | |
3950 | regular pointer or fat pointer type. GNAT_SUBPROG is the subprogram to | |
3951 | which the VMS descriptor is passed. */ | |
3952 | ||
3953 | static tree | |
3954 | convert_vms_descriptor32 (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog) | |
a1ab4c31 AC |
3955 | { |
3956 | tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); | |
3957 | tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); | |
3958 | /* The CLASS field is the 3rd field in the descriptor. */ | |
910ad8de | 3959 | tree klass = DECL_CHAIN (DECL_CHAIN (TYPE_FIELDS (desc_type))); |
a1ab4c31 | 3960 | /* The POINTER field is the 4th field in the descriptor. */ |
910ad8de | 3961 | tree pointer = DECL_CHAIN (klass); |
a1ab4c31 AC |
3962 | |
3963 | /* Retrieve the value of the POINTER field. */ | |
d628c015 | 3964 | tree gnu_expr32 |
a1ab4c31 AC |
3965 | = build3 (COMPONENT_REF, TREE_TYPE (pointer), desc, pointer, NULL_TREE); |
3966 | ||
3967 | if (POINTER_TYPE_P (gnu_type)) | |
d628c015 | 3968 | return convert (gnu_type, gnu_expr32); |
a1ab4c31 | 3969 | |
315cff15 | 3970 | else if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
3971 | { |
3972 | tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type)); | |
7d76717d | 3973 | tree p_bounds_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type))); |
a1ab4c31 AC |
3974 | tree template_type = TREE_TYPE (p_bounds_type); |
3975 | tree min_field = TYPE_FIELDS (template_type); | |
7d76717d | 3976 | tree max_field = DECL_CHAIN (TYPE_FIELDS (template_type)); |
6bf68a93 | 3977 | tree template_tree, template_addr, aflags, dimct, t, u; |
a1ab4c31 | 3978 | /* See the head comment of build_vms_descriptor. */ |
c6bd4220 | 3979 | int iklass = TREE_INT_CST_LOW (DECL_INITIAL (klass)); |
9771b263 | 3980 | vec<constructor_elt, va_gc> *v; |
a1ab4c31 | 3981 | |
86060344 | 3982 | /* Convert POINTER to the pointer-to-array type. */ |
d628c015 | 3983 | gnu_expr32 = convert (p_array_type, gnu_expr32); |
a1ab4c31 | 3984 | |
c6bd4220 | 3985 | switch (iklass) |
a1ab4c31 AC |
3986 | { |
3987 | case 1: /* Class S */ | |
3988 | case 15: /* Class SB */ | |
3989 | /* Build {1, LENGTH} template; LENGTH is the 1st field. */ | |
9771b263 | 3990 | vec_alloc (v, 2); |
a1ab4c31 AC |
3991 | t = TYPE_FIELDS (desc_type); |
3992 | t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
0e228dd9 NF |
3993 | CONSTRUCTOR_APPEND_ELT (v, min_field, |
3994 | convert (TREE_TYPE (min_field), | |
3995 | integer_one_node)); | |
3996 | CONSTRUCTOR_APPEND_ELT (v, max_field, | |
3997 | convert (TREE_TYPE (max_field), t)); | |
3998 | template_tree = gnat_build_constructor (template_type, v); | |
6bf68a93 | 3999 | template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template_tree); |
a1ab4c31 AC |
4000 | |
4001 | /* For class S, we are done. */ | |
c6bd4220 | 4002 | if (iklass == 1) |
a1ab4c31 AC |
4003 | break; |
4004 | ||
4005 | /* Test that we really have a SB descriptor, like DEC Ada. */ | |
c6bd4220 EB |
4006 | t = build3 (COMPONENT_REF, TREE_TYPE (klass), desc, klass, NULL); |
4007 | u = convert (TREE_TYPE (klass), DECL_INITIAL (klass)); | |
1139f2e8 | 4008 | u = build_binary_op (EQ_EXPR, boolean_type_node, t, u); |
a1ab4c31 AC |
4009 | /* If so, there is already a template in the descriptor and |
4010 | it is located right after the POINTER field. */ | |
7d76717d | 4011 | t = DECL_CHAIN (pointer); |
c6bd4220 EB |
4012 | template_tree |
4013 | = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
a1ab4c31 AC |
4014 | /* Otherwise use the {1, LENGTH} template we build above. */ |
4015 | template_addr = build3 (COND_EXPR, p_bounds_type, u, | |
4016 | build_unary_op (ADDR_EXPR, p_bounds_type, | |
6bf68a93 | 4017 | template_tree), |
a1ab4c31 AC |
4018 | template_addr); |
4019 | break; | |
4020 | ||
4021 | case 4: /* Class A */ | |
4022 | /* The AFLAGS field is the 7th field in the descriptor. */ | |
910ad8de | 4023 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (pointer))); |
a1ab4c31 AC |
4024 | aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
4025 | /* The DIMCT field is the 8th field in the descriptor. */ | |
7d76717d | 4026 | t = DECL_CHAIN (t); |
a1ab4c31 AC |
4027 | dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
4028 | /* Raise CONSTRAINT_ERROR if either more than 1 dimension | |
4029 | or FL_COEFF or FL_BOUNDS not set. */ | |
4030 | u = build_int_cst (TREE_TYPE (aflags), 192); | |
1139f2e8 EB |
4031 | u = build_binary_op (TRUTH_OR_EXPR, boolean_type_node, |
4032 | build_binary_op (NE_EXPR, boolean_type_node, | |
a1ab4c31 AC |
4033 | dimct, |
4034 | convert (TREE_TYPE (dimct), | |
4035 | size_one_node)), | |
1139f2e8 | 4036 | build_binary_op (NE_EXPR, boolean_type_node, |
a1ab4c31 AC |
4037 | build2 (BIT_AND_EXPR, |
4038 | TREE_TYPE (aflags), | |
4039 | aflags, u), | |
4040 | u)); | |
a1ab4c31 AC |
4041 | /* There is already a template in the descriptor and it is |
4042 | located at the start of block 3 (12th field). */ | |
910ad8de | 4043 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (t)))); |
c6bd4220 EB |
4044 | template_tree |
4045 | = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
f76d6e6f | 4046 | template_tree = build3 (COND_EXPR, TREE_TYPE (t), u, |
d628c015 DR |
4047 | build_call_raise (CE_Length_Check_Failed, Empty, |
4048 | N_Raise_Constraint_Error), | |
6bf68a93 | 4049 | template_tree); |
c6bd4220 EB |
4050 | template_addr |
4051 | = build_unary_op (ADDR_EXPR, p_bounds_type, template_tree); | |
a1ab4c31 AC |
4052 | break; |
4053 | ||
4054 | case 10: /* Class NCA */ | |
4055 | default: | |
4056 | post_error ("unsupported descriptor type for &", gnat_subprog); | |
4057 | template_addr = integer_zero_node; | |
4058 | break; | |
4059 | } | |
4060 | ||
4061 | /* Build the fat pointer in the form of a constructor. */ | |
9771b263 | 4062 | vec_alloc (v, 2); |
0e228dd9 | 4063 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (gnu_type), gnu_expr32); |
910ad8de | 4064 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (gnu_type)), |
0e228dd9 | 4065 | template_addr); |
d628c015 | 4066 | |
0e228dd9 | 4067 | return gnat_build_constructor (gnu_type, v); |
a1ab4c31 AC |
4068 | } |
4069 | ||
4070 | else | |
4071 | gcc_unreachable (); | |
4072 | } | |
4073 | ||
a981c964 EB |
4074 | /* Convert GNU_EXPR, a pointer to a VMS descriptor, to GNU_TYPE, a regular |
4075 | pointer or fat pointer type. GNU_EXPR_ALT_TYPE is the alternate (32-bit) | |
0c700259 EB |
4076 | pointer type of GNU_EXPR. BY_REF is true if the result is to be used by |
4077 | reference. GNAT_SUBPROG is the subprogram to which the VMS descriptor is | |
4078 | passed. */ | |
d628c015 | 4079 | |
f3d34576 | 4080 | tree |
a981c964 | 4081 | convert_vms_descriptor (tree gnu_type, tree gnu_expr, tree gnu_expr_alt_type, |
0c700259 | 4082 | bool by_ref, Entity_Id gnat_subprog) |
d628c015 DR |
4083 | { |
4084 | tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); | |
4085 | tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); | |
4086 | tree mbo = TYPE_FIELDS (desc_type); | |
4087 | const char *mbostr = IDENTIFIER_POINTER (DECL_NAME (mbo)); | |
910ad8de | 4088 | tree mbmo = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (mbo))); |
0c700259 EB |
4089 | tree real_type, is64bit, gnu_expr32, gnu_expr64; |
4090 | ||
4091 | if (by_ref) | |
4092 | real_type = TREE_TYPE (gnu_type); | |
4093 | else | |
4094 | real_type = gnu_type; | |
d628c015 | 4095 | |
a981c964 EB |
4096 | /* If the field name is not MBO, it must be 32-bit and no alternate. |
4097 | Otherwise primary must be 64-bit and alternate 32-bit. */ | |
d628c015 | 4098 | if (strcmp (mbostr, "MBO") != 0) |
0c700259 EB |
4099 | { |
4100 | tree ret = convert_vms_descriptor32 (real_type, gnu_expr, gnat_subprog); | |
4101 | if (by_ref) | |
4102 | ret = build_unary_op (ADDR_EXPR, gnu_type, ret); | |
4103 | return ret; | |
4104 | } | |
d628c015 | 4105 | |
a981c964 | 4106 | /* Build the test for 64-bit descriptor. */ |
d628c015 DR |
4107 | mbo = build3 (COMPONENT_REF, TREE_TYPE (mbo), desc, mbo, NULL_TREE); |
4108 | mbmo = build3 (COMPONENT_REF, TREE_TYPE (mbmo), desc, mbmo, NULL_TREE); | |
a981c964 | 4109 | is64bit |
1139f2e8 EB |
4110 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
4111 | build_binary_op (EQ_EXPR, boolean_type_node, | |
a981c964 EB |
4112 | convert (integer_type_node, mbo), |
4113 | integer_one_node), | |
1139f2e8 | 4114 | build_binary_op (EQ_EXPR, boolean_type_node, |
a981c964 EB |
4115 | convert (integer_type_node, mbmo), |
4116 | integer_minus_one_node)); | |
4117 | ||
4118 | /* Build the 2 possible end results. */ | |
0c700259 EB |
4119 | gnu_expr64 = convert_vms_descriptor64 (real_type, gnu_expr, gnat_subprog); |
4120 | if (by_ref) | |
4121 | gnu_expr64 = build_unary_op (ADDR_EXPR, gnu_type, gnu_expr64); | |
a981c964 | 4122 | gnu_expr = fold_convert (gnu_expr_alt_type, gnu_expr); |
0c700259 EB |
4123 | gnu_expr32 = convert_vms_descriptor32 (real_type, gnu_expr, gnat_subprog); |
4124 | if (by_ref) | |
4125 | gnu_expr32 = build_unary_op (ADDR_EXPR, gnu_type, gnu_expr32); | |
a981c964 EB |
4126 | |
4127 | return build3 (COND_EXPR, gnu_type, is64bit, gnu_expr64, gnu_expr32); | |
d628c015 | 4128 | } |
a1ab4c31 | 4129 | \f |
928dfa4b EB |
4130 | /* Build a type to be used to represent an aliased object whose nominal type |
4131 | is an unconstrained array. This consists of a RECORD_TYPE containing a | |
4132 | field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an ARRAY_TYPE. | |
4133 | If ARRAY_TYPE is that of an unconstrained array, this is used to represent | |
4134 | an arbitrary unconstrained object. Use NAME as the name of the record. | |
4135 | DEBUG_INFO_P is true if we need to write debug information for the type. */ | |
a1ab4c31 AC |
4136 | |
4137 | tree | |
928dfa4b EB |
4138 | build_unc_object_type (tree template_type, tree object_type, tree name, |
4139 | bool debug_info_p) | |
a1ab4c31 AC |
4140 | { |
4141 | tree type = make_node (RECORD_TYPE); | |
da01bfee EB |
4142 | tree template_field |
4143 | = create_field_decl (get_identifier ("BOUNDS"), template_type, type, | |
4144 | NULL_TREE, NULL_TREE, 0, 1); | |
4145 | tree array_field | |
4146 | = create_field_decl (get_identifier ("ARRAY"), object_type, type, | |
4147 | NULL_TREE, NULL_TREE, 0, 1); | |
a1ab4c31 AC |
4148 | |
4149 | TYPE_NAME (type) = name; | |
4150 | TYPE_CONTAINS_TEMPLATE_P (type) = 1; | |
910ad8de | 4151 | DECL_CHAIN (template_field) = array_field; |
928dfa4b EB |
4152 | finish_record_type (type, template_field, 0, true); |
4153 | ||
4154 | /* Declare it now since it will never be declared otherwise. This is | |
4155 | necessary to ensure that its subtrees are properly marked. */ | |
4156 | create_type_decl (name, type, NULL, true, debug_info_p, Empty); | |
a1ab4c31 AC |
4157 | |
4158 | return type; | |
4159 | } | |
4160 | ||
4161 | /* Same, taking a thin or fat pointer type instead of a template type. */ | |
4162 | ||
4163 | tree | |
4164 | build_unc_object_type_from_ptr (tree thin_fat_ptr_type, tree object_type, | |
928dfa4b | 4165 | tree name, bool debug_info_p) |
a1ab4c31 AC |
4166 | { |
4167 | tree template_type; | |
4168 | ||
315cff15 | 4169 | gcc_assert (TYPE_IS_FAT_OR_THIN_POINTER_P (thin_fat_ptr_type)); |
a1ab4c31 AC |
4170 | |
4171 | template_type | |
315cff15 | 4172 | = (TYPE_IS_FAT_POINTER_P (thin_fat_ptr_type) |
910ad8de | 4173 | ? TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (thin_fat_ptr_type)))) |
a1ab4c31 | 4174 | : TREE_TYPE (TYPE_FIELDS (TREE_TYPE (thin_fat_ptr_type)))); |
928dfa4b EB |
4175 | |
4176 | return | |
4177 | build_unc_object_type (template_type, object_type, name, debug_info_p); | |
a1ab4c31 | 4178 | } |
a1ab4c31 | 4179 | \f |
229077b0 EB |
4180 | /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE. |
4181 | In the normal case this is just two adjustments, but we have more to | |
4182 | do if NEW_TYPE is an UNCONSTRAINED_ARRAY_TYPE. */ | |
a1ab4c31 AC |
4183 | |
4184 | void | |
4185 | update_pointer_to (tree old_type, tree new_type) | |
4186 | { | |
4187 | tree ptr = TYPE_POINTER_TO (old_type); | |
4188 | tree ref = TYPE_REFERENCE_TO (old_type); | |
aeecf17c | 4189 | tree t; |
a1ab4c31 AC |
4190 | |
4191 | /* If this is the main variant, process all the other variants first. */ | |
4192 | if (TYPE_MAIN_VARIANT (old_type) == old_type) | |
aeecf17c EB |
4193 | for (t = TYPE_NEXT_VARIANT (old_type); t; t = TYPE_NEXT_VARIANT (t)) |
4194 | update_pointer_to (t, new_type); | |
a1ab4c31 | 4195 | |
229077b0 | 4196 | /* If no pointers and no references, we are done. */ |
a1ab4c31 AC |
4197 | if (!ptr && !ref) |
4198 | return; | |
4199 | ||
4200 | /* Merge the old type qualifiers in the new type. | |
4201 | ||
4202 | Each old variant has qualifiers for specific reasons, and the new | |
229077b0 | 4203 | designated type as well. Each set of qualifiers represents useful |
a1ab4c31 AC |
4204 | information grabbed at some point, and merging the two simply unifies |
4205 | these inputs into the final type description. | |
4206 | ||
4207 | Consider for instance a volatile type frozen after an access to constant | |
229077b0 EB |
4208 | type designating it; after the designated type's freeze, we get here with |
4209 | a volatile NEW_TYPE and a dummy OLD_TYPE with a readonly variant, created | |
4210 | when the access type was processed. We will make a volatile and readonly | |
a1ab4c31 AC |
4211 | designated type, because that's what it really is. |
4212 | ||
229077b0 EB |
4213 | We might also get here for a non-dummy OLD_TYPE variant with different |
4214 | qualifiers than those of NEW_TYPE, for instance in some cases of pointers | |
a1ab4c31 | 4215 | to private record type elaboration (see the comments around the call to |
229077b0 EB |
4216 | this routine in gnat_to_gnu_entity <E_Access_Type>). We have to merge |
4217 | the qualifiers in those cases too, to avoid accidentally discarding the | |
4218 | initial set, and will often end up with OLD_TYPE == NEW_TYPE then. */ | |
4219 | new_type | |
4220 | = build_qualified_type (new_type, | |
4221 | TYPE_QUALS (old_type) | TYPE_QUALS (new_type)); | |
4222 | ||
4223 | /* If old type and new type are identical, there is nothing to do. */ | |
a1ab4c31 AC |
4224 | if (old_type == new_type) |
4225 | return; | |
4226 | ||
4227 | /* Otherwise, first handle the simple case. */ | |
4228 | if (TREE_CODE (new_type) != UNCONSTRAINED_ARRAY_TYPE) | |
4229 | { | |
aeecf17c EB |
4230 | tree new_ptr, new_ref; |
4231 | ||
4232 | /* If pointer or reference already points to new type, nothing to do. | |
4233 | This can happen as update_pointer_to can be invoked multiple times | |
4234 | on the same couple of types because of the type variants. */ | |
4235 | if ((ptr && TREE_TYPE (ptr) == new_type) | |
4236 | || (ref && TREE_TYPE (ref) == new_type)) | |
4237 | return; | |
4238 | ||
4239 | /* Chain PTR and its variants at the end. */ | |
4240 | new_ptr = TYPE_POINTER_TO (new_type); | |
4241 | if (new_ptr) | |
4242 | { | |
4243 | while (TYPE_NEXT_PTR_TO (new_ptr)) | |
4244 | new_ptr = TYPE_NEXT_PTR_TO (new_ptr); | |
4245 | TYPE_NEXT_PTR_TO (new_ptr) = ptr; | |
4246 | } | |
4247 | else | |
4248 | TYPE_POINTER_TO (new_type) = ptr; | |
a1ab4c31 | 4249 | |
aeecf17c | 4250 | /* Now adjust them. */ |
a1ab4c31 | 4251 | for (; ptr; ptr = TYPE_NEXT_PTR_TO (ptr)) |
aeecf17c | 4252 | for (t = TYPE_MAIN_VARIANT (ptr); t; t = TYPE_NEXT_VARIANT (t)) |
50179d58 EB |
4253 | { |
4254 | TREE_TYPE (t) = new_type; | |
4255 | if (TYPE_NULL_BOUNDS (t)) | |
4256 | TREE_TYPE (TREE_OPERAND (TYPE_NULL_BOUNDS (t), 0)) = new_type; | |
4257 | } | |
de9528f0 | 4258 | |
aeecf17c EB |
4259 | /* Chain REF and its variants at the end. */ |
4260 | new_ref = TYPE_REFERENCE_TO (new_type); | |
4261 | if (new_ref) | |
4262 | { | |
4263 | while (TYPE_NEXT_REF_TO (new_ref)) | |
4264 | new_ref = TYPE_NEXT_REF_TO (new_ref); | |
4265 | TYPE_NEXT_REF_TO (new_ref) = ref; | |
4266 | } | |
4267 | else | |
4268 | TYPE_REFERENCE_TO (new_type) = ref; | |
4269 | ||
4270 | /* Now adjust them. */ | |
a1ab4c31 | 4271 | for (; ref; ref = TYPE_NEXT_REF_TO (ref)) |
aeecf17c EB |
4272 | for (t = TYPE_MAIN_VARIANT (ref); t; t = TYPE_NEXT_VARIANT (t)) |
4273 | TREE_TYPE (t) = new_type; | |
de9528f0 EB |
4274 | |
4275 | TYPE_POINTER_TO (old_type) = NULL_TREE; | |
3bd6ca3f | 4276 | TYPE_REFERENCE_TO (old_type) = NULL_TREE; |
a1ab4c31 AC |
4277 | } |
4278 | ||
aeecf17c EB |
4279 | /* Now deal with the unconstrained array case. In this case the pointer |
4280 | is actually a record where both fields are pointers to dummy nodes. | |
e3edbd56 EB |
4281 | Turn them into pointers to the correct types using update_pointer_to. |
4282 | Likewise for the pointer to the object record (thin pointer). */ | |
a1ab4c31 AC |
4283 | else |
4284 | { | |
e3edbd56 | 4285 | tree new_ptr = TYPE_POINTER_TO (new_type); |
aeecf17c EB |
4286 | |
4287 | gcc_assert (TYPE_IS_FAT_POINTER_P (ptr)); | |
4288 | ||
e3edbd56 | 4289 | /* If PTR already points to NEW_TYPE, nothing to do. This can happen |
aeecf17c EB |
4290 | since update_pointer_to can be invoked multiple times on the same |
4291 | couple of types because of the type variants. */ | |
4292 | if (TYPE_UNCONSTRAINED_ARRAY (ptr) == new_type) | |
4293 | return; | |
4294 | ||
a1ab4c31 | 4295 | update_pointer_to |
e3edbd56 EB |
4296 | (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (ptr))), |
4297 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS (new_ptr)))); | |
a1ab4c31 | 4298 | |
a1ab4c31 | 4299 | update_pointer_to |
e3edbd56 EB |
4300 | (TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (ptr)))), |
4301 | TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (new_ptr))))); | |
aeecf17c | 4302 | |
e3edbd56 EB |
4303 | update_pointer_to (TYPE_OBJECT_RECORD_TYPE (old_type), |
4304 | TYPE_OBJECT_RECORD_TYPE (new_type)); | |
a1ab4c31 | 4305 | |
e3edbd56 | 4306 | TYPE_POINTER_TO (old_type) = NULL_TREE; |
a1ab4c31 AC |
4307 | } |
4308 | } | |
4309 | \f | |
8df2e902 EB |
4310 | /* Convert EXPR, a pointer to a constrained array, into a pointer to an |
4311 | unconstrained one. This involves making or finding a template. */ | |
a1ab4c31 AC |
4312 | |
4313 | static tree | |
4314 | convert_to_fat_pointer (tree type, tree expr) | |
4315 | { | |
910ad8de | 4316 | tree template_type = TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type)))); |
8df2e902 | 4317 | tree p_array_type = TREE_TYPE (TYPE_FIELDS (type)); |
a1ab4c31 | 4318 | tree etype = TREE_TYPE (expr); |
6bf68a93 | 4319 | tree template_tree; |
9771b263 DN |
4320 | vec<constructor_elt, va_gc> *v; |
4321 | vec_alloc (v, 2); | |
a1ab4c31 | 4322 | |
50179d58 EB |
4323 | /* If EXPR is null, make a fat pointer that contains a null pointer to the |
4324 | array (compare_fat_pointers ensures that this is the full discriminant) | |
4325 | and a valid pointer to the bounds. This latter property is necessary | |
4326 | since the compiler can hoist the load of the bounds done through it. */ | |
a1ab4c31 | 4327 | if (integer_zerop (expr)) |
0e228dd9 | 4328 | { |
50179d58 EB |
4329 | tree ptr_template_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type))); |
4330 | tree null_bounds, t; | |
4331 | ||
4332 | if (TYPE_NULL_BOUNDS (ptr_template_type)) | |
4333 | null_bounds = TYPE_NULL_BOUNDS (ptr_template_type); | |
4334 | else | |
4335 | { | |
4336 | /* The template type can still be dummy at this point so we build an | |
4337 | empty constructor. The middle-end will fill it in with zeros. */ | |
9771b263 DN |
4338 | t = build_constructor (template_type, |
4339 | NULL); | |
50179d58 EB |
4340 | TREE_CONSTANT (t) = TREE_STATIC (t) = 1; |
4341 | null_bounds = build_unary_op (ADDR_EXPR, NULL_TREE, t); | |
4342 | SET_TYPE_NULL_BOUNDS (ptr_template_type, null_bounds); | |
4343 | } | |
4344 | ||
0e228dd9 | 4345 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
50179d58 EB |
4346 | fold_convert (p_array_type, null_pointer_node)); |
4347 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), null_bounds); | |
4348 | t = build_constructor (type, v); | |
4349 | /* Do not set TREE_CONSTANT so as to force T to static memory. */ | |
4350 | TREE_CONSTANT (t) = 0; | |
4351 | TREE_STATIC (t) = 1; | |
4352 | ||
4353 | return t; | |
0e228dd9 | 4354 | } |
a1ab4c31 | 4355 | |
0d7de0e1 EB |
4356 | /* If EXPR is a thin pointer, make template and data from the record. */ |
4357 | if (TYPE_IS_THIN_POINTER_P (etype)) | |
a1ab4c31 | 4358 | { |
0d7de0e1 | 4359 | tree field = TYPE_FIELDS (TREE_TYPE (etype)); |
a1ab4c31 | 4360 | |
7d7a1fe8 | 4361 | expr = gnat_protect_expr (expr); |
a1ab4c31 AC |
4362 | if (TREE_CODE (expr) == ADDR_EXPR) |
4363 | expr = TREE_OPERAND (expr, 0); | |
4364 | else | |
2b45154d EB |
4365 | { |
4366 | /* If we have a TYPE_UNCONSTRAINED_ARRAY attached to the RECORD_TYPE, | |
4367 | the thin pointer value has been shifted so we first need to shift | |
4368 | it back to get the template address. */ | |
4369 | if (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (etype))) | |
4370 | expr | |
4371 | = build_binary_op (POINTER_PLUS_EXPR, etype, expr, | |
4372 | fold_build1 (NEGATE_EXPR, sizetype, | |
4373 | byte_position | |
4374 | (DECL_CHAIN (field)))); | |
4375 | expr = build1 (INDIRECT_REF, TREE_TYPE (etype), expr); | |
4376 | } | |
a1ab4c31 | 4377 | |
0d7de0e1 | 4378 | template_tree = build_component_ref (expr, NULL_TREE, field, false); |
a1ab4c31 AC |
4379 | expr = build_unary_op (ADDR_EXPR, NULL_TREE, |
4380 | build_component_ref (expr, NULL_TREE, | |
0d7de0e1 | 4381 | DECL_CHAIN (field), false)); |
a1ab4c31 | 4382 | } |
8df2e902 EB |
4383 | |
4384 | /* Otherwise, build the constructor for the template. */ | |
a1ab4c31 | 4385 | else |
6bf68a93 | 4386 | template_tree = build_template (template_type, TREE_TYPE (etype), expr); |
a1ab4c31 | 4387 | |
8df2e902 | 4388 | /* The final result is a constructor for the fat pointer. |
a1ab4c31 | 4389 | |
8df2e902 EB |
4390 | If EXPR is an argument of a foreign convention subprogram, the type it |
4391 | points to is directly the component type. In this case, the expression | |
a1ab4c31 | 4392 | type may not match the corresponding FIELD_DECL type at this point, so we |
8df2e902 | 4393 | call "convert" here to fix that up if necessary. This type consistency is |
a1ab4c31 | 4394 | required, for instance because it ensures that possible later folding of |
8df2e902 | 4395 | COMPONENT_REFs against this constructor always yields something of the |
a1ab4c31 AC |
4396 | same type as the initial reference. |
4397 | ||
8df2e902 EB |
4398 | Note that the call to "build_template" above is still fine because it |
4399 | will only refer to the provided TEMPLATE_TYPE in this case. */ | |
0e228dd9 NF |
4400 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
4401 | convert (p_array_type, expr)); | |
910ad8de | 4402 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), |
0e228dd9 NF |
4403 | build_unary_op (ADDR_EXPR, NULL_TREE, |
4404 | template_tree)); | |
4405 | return gnat_build_constructor (type, v); | |
a1ab4c31 AC |
4406 | } |
4407 | \f | |
a1ab4c31 AC |
4408 | /* Create an expression whose value is that of EXPR, |
4409 | converted to type TYPE. The TREE_TYPE of the value | |
4410 | is always TYPE. This function implements all reasonable | |
4411 | conversions; callers should filter out those that are | |
4412 | not permitted by the language being compiled. */ | |
4413 | ||
4414 | tree | |
4415 | convert (tree type, tree expr) | |
4416 | { | |
a1ab4c31 AC |
4417 | tree etype = TREE_TYPE (expr); |
4418 | enum tree_code ecode = TREE_CODE (etype); | |
c34f3839 | 4419 | enum tree_code code = TREE_CODE (type); |
a1ab4c31 | 4420 | |
c34f3839 EB |
4421 | /* If the expression is already of the right type, we are done. */ |
4422 | if (etype == type) | |
a1ab4c31 AC |
4423 | return expr; |
4424 | ||
4425 | /* If both input and output have padding and are of variable size, do this | |
4426 | as an unchecked conversion. Likewise if one is a mere variant of the | |
4427 | other, so we avoid a pointless unpad/repad sequence. */ | |
4428 | else if (code == RECORD_TYPE && ecode == RECORD_TYPE | |
315cff15 | 4429 | && TYPE_PADDING_P (type) && TYPE_PADDING_P (etype) |
a1ab4c31 AC |
4430 | && (!TREE_CONSTANT (TYPE_SIZE (type)) |
4431 | || !TREE_CONSTANT (TYPE_SIZE (etype)) | |
842d4ee2 | 4432 | || TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (etype) |
a1ab4c31 AC |
4433 | || TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type))) |
4434 | == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (etype))))) | |
4435 | ; | |
4436 | ||
f88facfe EB |
4437 | /* If the output type has padding, convert to the inner type and make a |
4438 | constructor to build the record, unless a variable size is involved. */ | |
315cff15 | 4439 | else if (code == RECORD_TYPE && TYPE_PADDING_P (type)) |
a1ab4c31 | 4440 | { |
9771b263 | 4441 | vec<constructor_elt, va_gc> *v; |
0e228dd9 | 4442 | |
a1ab4c31 AC |
4443 | /* If we previously converted from another type and our type is |
4444 | of variable size, remove the conversion to avoid the need for | |
f88facfe | 4445 | variable-sized temporaries. Likewise for a conversion between |
a1ab4c31 AC |
4446 | original and packable version. */ |
4447 | if (TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
4448 | && (!TREE_CONSTANT (TYPE_SIZE (type)) | |
4449 | || (ecode == RECORD_TYPE | |
4450 | && TYPE_NAME (etype) | |
4451 | == TYPE_NAME (TREE_TYPE (TREE_OPERAND (expr, 0)))))) | |
4452 | expr = TREE_OPERAND (expr, 0); | |
4453 | ||
4454 | /* If we are just removing the padding from expr, convert the original | |
4455 | object if we have variable size in order to avoid the need for some | |
f88facfe | 4456 | variable-sized temporaries. Likewise if the padding is a variant |
a1ab4c31 AC |
4457 | of the other, so we avoid a pointless unpad/repad sequence. */ |
4458 | if (TREE_CODE (expr) == COMPONENT_REF | |
a1ab4c31 AC |
4459 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (expr, 0))) |
4460 | && (!TREE_CONSTANT (TYPE_SIZE (type)) | |
842d4ee2 EB |
4461 | || TYPE_MAIN_VARIANT (type) |
4462 | == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (expr, 0))) | |
a1ab4c31 AC |
4463 | || (ecode == RECORD_TYPE |
4464 | && TYPE_NAME (etype) | |
4465 | == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type)))))) | |
4466 | return convert (type, TREE_OPERAND (expr, 0)); | |
4467 | ||
431cfac1 EB |
4468 | /* If the inner type is of self-referential size and the expression type |
4469 | is a record, do this as an unchecked conversion. But first pad the | |
4470 | expression if possible to have the same size on both sides. */ | |
c34f3839 | 4471 | if (ecode == RECORD_TYPE |
f88facfe | 4472 | && CONTAINS_PLACEHOLDER_P (DECL_SIZE (TYPE_FIELDS (type)))) |
431cfac1 | 4473 | { |
980a0501 | 4474 | if (TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST) |
431cfac1 | 4475 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, |
980a0501 EB |
4476 | false, false, false, true), |
4477 | expr); | |
431cfac1 EB |
4478 | return unchecked_convert (type, expr, false); |
4479 | } | |
a1ab4c31 | 4480 | |
f88facfe EB |
4481 | /* If we are converting between array types with variable size, do the |
4482 | final conversion as an unchecked conversion, again to avoid the need | |
4483 | for some variable-sized temporaries. If valid, this conversion is | |
4484 | very likely purely technical and without real effects. */ | |
c34f3839 | 4485 | if (ecode == ARRAY_TYPE |
f88facfe EB |
4486 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == ARRAY_TYPE |
4487 | && !TREE_CONSTANT (TYPE_SIZE (etype)) | |
4488 | && !TREE_CONSTANT (TYPE_SIZE (type))) | |
4489 | return unchecked_convert (type, | |
4490 | convert (TREE_TYPE (TYPE_FIELDS (type)), | |
4491 | expr), | |
4492 | false); | |
4493 | ||
9771b263 | 4494 | vec_alloc (v, 1); |
0e228dd9 NF |
4495 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
4496 | convert (TREE_TYPE (TYPE_FIELDS (type)), expr)); | |
4497 | return gnat_build_constructor (type, v); | |
a1ab4c31 AC |
4498 | } |
4499 | ||
4500 | /* If the input type has padding, remove it and convert to the output type. | |
4501 | The conditions ordering is arranged to ensure that the output type is not | |
4502 | a padding type here, as it is not clear whether the conversion would | |
4503 | always be correct if this was to happen. */ | |
315cff15 | 4504 | else if (ecode == RECORD_TYPE && TYPE_PADDING_P (etype)) |
a1ab4c31 AC |
4505 | { |
4506 | tree unpadded; | |
4507 | ||
4508 | /* If we have just converted to this padded type, just get the | |
4509 | inner expression. */ | |
4510 | if (TREE_CODE (expr) == CONSTRUCTOR | |
9771b263 DN |
4511 | && !vec_safe_is_empty (CONSTRUCTOR_ELTS (expr)) |
4512 | && (*CONSTRUCTOR_ELTS (expr))[0].index == TYPE_FIELDS (etype)) | |
4513 | unpadded = (*CONSTRUCTOR_ELTS (expr))[0].value; | |
a1ab4c31 AC |
4514 | |
4515 | /* Otherwise, build an explicit component reference. */ | |
4516 | else | |
4517 | unpadded | |
4518 | = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (etype), false); | |
4519 | ||
4520 | return convert (type, unpadded); | |
4521 | } | |
4522 | ||
4523 | /* If the input is a biased type, adjust first. */ | |
4524 | if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype)) | |
4525 | return convert (type, fold_build2 (PLUS_EXPR, TREE_TYPE (etype), | |
4526 | fold_convert (TREE_TYPE (etype), | |
4527 | expr), | |
4528 | TYPE_MIN_VALUE (etype))); | |
4529 | ||
4530 | /* If the input is a justified modular type, we need to extract the actual | |
4531 | object before converting it to any other type with the exceptions of an | |
4532 | unconstrained array or of a mere type variant. It is useful to avoid the | |
4533 | extraction and conversion in the type variant case because it could end | |
4534 | up replacing a VAR_DECL expr by a constructor and we might be about the | |
4535 | take the address of the result. */ | |
4536 | if (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype) | |
4537 | && code != UNCONSTRAINED_ARRAY_TYPE | |
4538 | && TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (etype)) | |
4539 | return convert (type, build_component_ref (expr, NULL_TREE, | |
4540 | TYPE_FIELDS (etype), false)); | |
4541 | ||
4542 | /* If converting to a type that contains a template, convert to the data | |
4543 | type and then build the template. */ | |
4544 | if (code == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (type)) | |
4545 | { | |
910ad8de | 4546 | tree obj_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type))); |
9771b263 DN |
4547 | vec<constructor_elt, va_gc> *v; |
4548 | vec_alloc (v, 2); | |
a1ab4c31 AC |
4549 | |
4550 | /* If the source already has a template, get a reference to the | |
4551 | associated array only, as we are going to rebuild a template | |
4552 | for the target type anyway. */ | |
4553 | expr = maybe_unconstrained_array (expr); | |
4554 | ||
0e228dd9 NF |
4555 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
4556 | build_template (TREE_TYPE (TYPE_FIELDS (type)), | |
4557 | obj_type, NULL_TREE)); | |
910ad8de | 4558 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), |
0e228dd9 NF |
4559 | convert (obj_type, expr)); |
4560 | return gnat_build_constructor (type, v); | |
a1ab4c31 AC |
4561 | } |
4562 | ||
a1c7d797 | 4563 | /* There are some cases of expressions that we process specially. */ |
a1ab4c31 AC |
4564 | switch (TREE_CODE (expr)) |
4565 | { | |
4566 | case ERROR_MARK: | |
4567 | return expr; | |
4568 | ||
4569 | case NULL_EXPR: | |
4570 | /* Just set its type here. For TRANSFORM_EXPR, we will do the actual | |
4571 | conversion in gnat_expand_expr. NULL_EXPR does not represent | |
4572 | and actual value, so no conversion is needed. */ | |
4573 | expr = copy_node (expr); | |
4574 | TREE_TYPE (expr) = type; | |
4575 | return expr; | |
4576 | ||
4577 | case STRING_CST: | |
4578 | /* If we are converting a STRING_CST to another constrained array type, | |
4579 | just make a new one in the proper type. */ | |
4580 | if (code == ecode && AGGREGATE_TYPE_P (etype) | |
4581 | && !(TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST | |
4582 | && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)) | |
4583 | { | |
4584 | expr = copy_node (expr); | |
4585 | TREE_TYPE (expr) = type; | |
4586 | return expr; | |
4587 | } | |
4588 | break; | |
4589 | ||
7948ae37 OH |
4590 | case VECTOR_CST: |
4591 | /* If we are converting a VECTOR_CST to a mere variant type, just make | |
4592 | a new one in the proper type. */ | |
4593 | if (code == ecode && gnat_types_compatible_p (type, etype)) | |
4594 | { | |
4595 | expr = copy_node (expr); | |
4596 | TREE_TYPE (expr) = type; | |
4597 | return expr; | |
4598 | } | |
4599 | ||
a1ab4c31 AC |
4600 | case CONSTRUCTOR: |
4601 | /* If we are converting a CONSTRUCTOR to a mere variant type, just make | |
4602 | a new one in the proper type. */ | |
4603 | if (code == ecode && gnat_types_compatible_p (type, etype)) | |
4604 | { | |
4605 | expr = copy_node (expr); | |
4606 | TREE_TYPE (expr) = type; | |
9771b263 | 4607 | CONSTRUCTOR_ELTS (expr) = vec_safe_copy (CONSTRUCTOR_ELTS (expr)); |
a1ab4c31 AC |
4608 | return expr; |
4609 | } | |
4610 | ||
cb3d597d EB |
4611 | /* Likewise for a conversion between original and packable version, or |
4612 | conversion between types of the same size and with the same list of | |
4613 | fields, but we have to work harder to preserve type consistency. */ | |
a1ab4c31 AC |
4614 | if (code == ecode |
4615 | && code == RECORD_TYPE | |
cb3d597d EB |
4616 | && (TYPE_NAME (type) == TYPE_NAME (etype) |
4617 | || tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (etype)))) | |
4618 | ||
a1ab4c31 | 4619 | { |
9771b263 DN |
4620 | vec<constructor_elt, va_gc> *e = CONSTRUCTOR_ELTS (expr); |
4621 | unsigned HOST_WIDE_INT len = vec_safe_length (e); | |
4622 | vec<constructor_elt, va_gc> *v; | |
4623 | vec_alloc (v, len); | |
a1ab4c31 AC |
4624 | tree efield = TYPE_FIELDS (etype), field = TYPE_FIELDS (type); |
4625 | unsigned HOST_WIDE_INT idx; | |
4626 | tree index, value; | |
4627 | ||
db868e1e OH |
4628 | /* Whether we need to clear TREE_CONSTANT et al. on the output |
4629 | constructor when we convert in place. */ | |
4630 | bool clear_constant = false; | |
4631 | ||
a1ab4c31 AC |
4632 | FOR_EACH_CONSTRUCTOR_ELT(e, idx, index, value) |
4633 | { | |
cb3d597d EB |
4634 | /* We expect only simple constructors. */ |
4635 | if (!SAME_FIELD_P (index, efield)) | |
4636 | break; | |
4637 | /* The field must be the same. */ | |
4638 | if (!SAME_FIELD_P (efield, field)) | |
a1ab4c31 | 4639 | break; |
f32682ca | 4640 | constructor_elt elt = {field, convert (TREE_TYPE (field), value)}; |
9771b263 | 4641 | v->quick_push (elt); |
db868e1e OH |
4642 | |
4643 | /* If packing has made this field a bitfield and the input | |
4644 | value couldn't be emitted statically any more, we need to | |
4645 | clear TREE_CONSTANT on our output. */ | |
ced57283 EB |
4646 | if (!clear_constant |
4647 | && TREE_CONSTANT (expr) | |
db868e1e OH |
4648 | && !CONSTRUCTOR_BITFIELD_P (efield) |
4649 | && CONSTRUCTOR_BITFIELD_P (field) | |
4650 | && !initializer_constant_valid_for_bitfield_p (value)) | |
4651 | clear_constant = true; | |
4652 | ||
910ad8de NF |
4653 | efield = DECL_CHAIN (efield); |
4654 | field = DECL_CHAIN (field); | |
a1ab4c31 AC |
4655 | } |
4656 | ||
db868e1e OH |
4657 | /* If we have been able to match and convert all the input fields |
4658 | to their output type, convert in place now. We'll fallback to a | |
4659 | view conversion downstream otherwise. */ | |
a1ab4c31 AC |
4660 | if (idx == len) |
4661 | { | |
4662 | expr = copy_node (expr); | |
4663 | TREE_TYPE (expr) = type; | |
4664 | CONSTRUCTOR_ELTS (expr) = v; | |
db868e1e | 4665 | if (clear_constant) |
ced57283 | 4666 | TREE_CONSTANT (expr) = TREE_STATIC (expr) = 0; |
a1ab4c31 AC |
4667 | return expr; |
4668 | } | |
4669 | } | |
7948ae37 OH |
4670 | |
4671 | /* Likewise for a conversion between array type and vector type with a | |
4672 | compatible representative array. */ | |
4673 | else if (code == VECTOR_TYPE | |
4674 | && ecode == ARRAY_TYPE | |
4675 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), | |
4676 | etype)) | |
4677 | { | |
9771b263 DN |
4678 | vec<constructor_elt, va_gc> *e = CONSTRUCTOR_ELTS (expr); |
4679 | unsigned HOST_WIDE_INT len = vec_safe_length (e); | |
4680 | vec<constructor_elt, va_gc> *v; | |
7948ae37 OH |
4681 | unsigned HOST_WIDE_INT ix; |
4682 | tree value; | |
4683 | ||
4684 | /* Build a VECTOR_CST from a *constant* array constructor. */ | |
4685 | if (TREE_CONSTANT (expr)) | |
4686 | { | |
4687 | bool constant_p = true; | |
4688 | ||
4689 | /* Iterate through elements and check if all constructor | |
4690 | elements are *_CSTs. */ | |
4691 | FOR_EACH_CONSTRUCTOR_VALUE (e, ix, value) | |
4692 | if (!CONSTANT_CLASS_P (value)) | |
4693 | { | |
4694 | constant_p = false; | |
4695 | break; | |
4696 | } | |
4697 | ||
4698 | if (constant_p) | |
4699 | return build_vector_from_ctor (type, | |
4700 | CONSTRUCTOR_ELTS (expr)); | |
4701 | } | |
4702 | ||
4703 | /* Otherwise, build a regular vector constructor. */ | |
9771b263 | 4704 | vec_alloc (v, len); |
7948ae37 OH |
4705 | FOR_EACH_CONSTRUCTOR_VALUE (e, ix, value) |
4706 | { | |
f32682ca | 4707 | constructor_elt elt = {NULL_TREE, value}; |
9771b263 | 4708 | v->quick_push (elt); |
7948ae37 OH |
4709 | } |
4710 | expr = copy_node (expr); | |
4711 | TREE_TYPE (expr) = type; | |
4712 | CONSTRUCTOR_ELTS (expr) = v; | |
4713 | return expr; | |
4714 | } | |
a1ab4c31 AC |
4715 | break; |
4716 | ||
4717 | case UNCONSTRAINED_ARRAY_REF: | |
a1c7d797 EB |
4718 | /* First retrieve the underlying array. */ |
4719 | expr = maybe_unconstrained_array (expr); | |
4720 | etype = TREE_TYPE (expr); | |
4721 | ecode = TREE_CODE (etype); | |
4722 | break; | |
a1ab4c31 AC |
4723 | |
4724 | case VIEW_CONVERT_EXPR: | |
4725 | { | |
4726 | /* GCC 4.x is very sensitive to type consistency overall, and view | |
4727 | conversions thus are very frequent. Even though just "convert"ing | |
4728 | the inner operand to the output type is fine in most cases, it | |
4729 | might expose unexpected input/output type mismatches in special | |
4730 | circumstances so we avoid such recursive calls when we can. */ | |
4731 | tree op0 = TREE_OPERAND (expr, 0); | |
4732 | ||
4733 | /* If we are converting back to the original type, we can just | |
4734 | lift the input conversion. This is a common occurrence with | |
4735 | switches back-and-forth amongst type variants. */ | |
4736 | if (type == TREE_TYPE (op0)) | |
4737 | return op0; | |
4738 | ||
7948ae37 OH |
4739 | /* Otherwise, if we're converting between two aggregate or vector |
4740 | types, we might be allowed to substitute the VIEW_CONVERT_EXPR | |
4741 | target type in place or to just convert the inner expression. */ | |
4742 | if ((AGGREGATE_TYPE_P (type) && AGGREGATE_TYPE_P (etype)) | |
4743 | || (VECTOR_TYPE_P (type) && VECTOR_TYPE_P (etype))) | |
a1ab4c31 AC |
4744 | { |
4745 | /* If we are converting between mere variants, we can just | |
4746 | substitute the VIEW_CONVERT_EXPR in place. */ | |
4747 | if (gnat_types_compatible_p (type, etype)) | |
4748 | return build1 (VIEW_CONVERT_EXPR, type, op0); | |
4749 | ||
4750 | /* Otherwise, we may just bypass the input view conversion unless | |
4751 | one of the types is a fat pointer, which is handled by | |
4752 | specialized code below which relies on exact type matching. */ | |
315cff15 EB |
4753 | else if (!TYPE_IS_FAT_POINTER_P (type) |
4754 | && !TYPE_IS_FAT_POINTER_P (etype)) | |
a1ab4c31 AC |
4755 | return convert (type, op0); |
4756 | } | |
ad1d36ba EB |
4757 | |
4758 | break; | |
a1ab4c31 | 4759 | } |
a1ab4c31 | 4760 | |
a1ab4c31 AC |
4761 | default: |
4762 | break; | |
4763 | } | |
4764 | ||
4765 | /* Check for converting to a pointer to an unconstrained array. */ | |
315cff15 | 4766 | if (TYPE_IS_FAT_POINTER_P (type) && !TYPE_IS_FAT_POINTER_P (etype)) |
a1ab4c31 AC |
4767 | return convert_to_fat_pointer (type, expr); |
4768 | ||
7948ae37 OH |
4769 | /* If we are converting between two aggregate or vector types that are mere |
4770 | variants, just make a VIEW_CONVERT_EXPR. Likewise when we are converting | |
4771 | to a vector type from its representative array type. */ | |
4772 | else if ((code == ecode | |
4773 | && (AGGREGATE_TYPE_P (type) || VECTOR_TYPE_P (type)) | |
4774 | && gnat_types_compatible_p (type, etype)) | |
4775 | || (code == VECTOR_TYPE | |
4776 | && ecode == ARRAY_TYPE | |
4777 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), | |
4778 | etype))) | |
a1ab4c31 AC |
4779 | return build1 (VIEW_CONVERT_EXPR, type, expr); |
4780 | ||
76af763d EB |
4781 | /* If we are converting between tagged types, try to upcast properly. */ |
4782 | else if (ecode == RECORD_TYPE && code == RECORD_TYPE | |
4783 | && TYPE_ALIGN_OK (etype) && TYPE_ALIGN_OK (type)) | |
4784 | { | |
4785 | tree child_etype = etype; | |
4786 | do { | |
4787 | tree field = TYPE_FIELDS (child_etype); | |
4788 | if (DECL_NAME (field) == parent_name_id && TREE_TYPE (field) == type) | |
4789 | return build_component_ref (expr, NULL_TREE, field, false); | |
4790 | child_etype = TREE_TYPE (field); | |
4791 | } while (TREE_CODE (child_etype) == RECORD_TYPE); | |
4792 | } | |
4793 | ||
bb1f7929 EB |
4794 | /* If we are converting from a smaller form of record type back to it, just |
4795 | make a VIEW_CONVERT_EXPR. But first pad the expression to have the same | |
4796 | size on both sides. */ | |
4797 | else if (ecode == RECORD_TYPE && code == RECORD_TYPE | |
4798 | && smaller_form_type_p (etype, type)) | |
4799 | { | |
4800 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, | |
4801 | false, false, false, true), | |
4802 | expr); | |
4803 | return build1 (VIEW_CONVERT_EXPR, type, expr); | |
4804 | } | |
4805 | ||
a1ab4c31 | 4806 | /* In all other cases of related types, make a NOP_EXPR. */ |
86060344 | 4807 | else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (etype)) |
a1ab4c31 AC |
4808 | return fold_convert (type, expr); |
4809 | ||
4810 | switch (code) | |
4811 | { | |
4812 | case VOID_TYPE: | |
4813 | return fold_build1 (CONVERT_EXPR, type, expr); | |
4814 | ||
a1ab4c31 AC |
4815 | case INTEGER_TYPE: |
4816 | if (TYPE_HAS_ACTUAL_BOUNDS_P (type) | |
4817 | && (ecode == ARRAY_TYPE || ecode == UNCONSTRAINED_ARRAY_TYPE | |
4818 | || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype)))) | |
4819 | return unchecked_convert (type, expr, false); | |
4820 | else if (TYPE_BIASED_REPRESENTATION_P (type)) | |
4821 | return fold_convert (type, | |
4822 | fold_build2 (MINUS_EXPR, TREE_TYPE (type), | |
4823 | convert (TREE_TYPE (type), expr), | |
4824 | TYPE_MIN_VALUE (type))); | |
4825 | ||
4826 | /* ... fall through ... */ | |
4827 | ||
4828 | case ENUMERAL_TYPE: | |
01ddebf2 | 4829 | case BOOLEAN_TYPE: |
a1ab4c31 AC |
4830 | /* If we are converting an additive expression to an integer type |
4831 | with lower precision, be wary of the optimization that can be | |
4832 | applied by convert_to_integer. There are 2 problematic cases: | |
4833 | - if the first operand was originally of a biased type, | |
4834 | because we could be recursively called to convert it | |
4835 | to an intermediate type and thus rematerialize the | |
4836 | additive operator endlessly, | |
4837 | - if the expression contains a placeholder, because an | |
4838 | intermediate conversion that changes the sign could | |
4839 | be inserted and thus introduce an artificial overflow | |
4840 | at compile time when the placeholder is substituted. */ | |
4841 | if (code == INTEGER_TYPE | |
4842 | && ecode == INTEGER_TYPE | |
4843 | && TYPE_PRECISION (type) < TYPE_PRECISION (etype) | |
4844 | && (TREE_CODE (expr) == PLUS_EXPR || TREE_CODE (expr) == MINUS_EXPR)) | |
4845 | { | |
4846 | tree op0 = get_unwidened (TREE_OPERAND (expr, 0), type); | |
4847 | ||
4848 | if ((TREE_CODE (TREE_TYPE (op0)) == INTEGER_TYPE | |
4849 | && TYPE_BIASED_REPRESENTATION_P (TREE_TYPE (op0))) | |
4850 | || CONTAINS_PLACEHOLDER_P (expr)) | |
4851 | return build1 (NOP_EXPR, type, expr); | |
4852 | } | |
4853 | ||
4854 | return fold (convert_to_integer (type, expr)); | |
4855 | ||
4856 | case POINTER_TYPE: | |
4857 | case REFERENCE_TYPE: | |
0d7de0e1 | 4858 | /* If converting between two thin pointers, adjust if needed to account |
2b45154d EB |
4859 | for differing offsets from the base pointer, depending on whether |
4860 | there is a TYPE_UNCONSTRAINED_ARRAY attached to the record type. */ | |
315cff15 | 4861 | if (TYPE_IS_THIN_POINTER_P (etype) && TYPE_IS_THIN_POINTER_P (type)) |
a1ab4c31 | 4862 | { |
2b45154d EB |
4863 | tree etype_pos |
4864 | = TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (etype)) != NULL_TREE | |
4865 | ? byte_position (DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (etype)))) | |
4866 | : size_zero_node; | |
4867 | tree type_pos | |
4868 | = TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)) != NULL_TREE | |
4869 | ? byte_position (DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (type)))) | |
4870 | : size_zero_node; | |
4871 | tree byte_diff = size_diffop (type_pos, etype_pos); | |
0d7de0e1 | 4872 | |
a1ab4c31 | 4873 | expr = build1 (NOP_EXPR, type, expr); |
a1ab4c31 AC |
4874 | if (integer_zerop (byte_diff)) |
4875 | return expr; | |
4876 | ||
4877 | return build_binary_op (POINTER_PLUS_EXPR, type, expr, | |
0d7de0e1 | 4878 | fold_convert (sizetype, byte_diff)); |
a1ab4c31 AC |
4879 | } |
4880 | ||
0d7de0e1 EB |
4881 | /* If converting fat pointer to normal or thin pointer, get the pointer |
4882 | to the array and then convert it. */ | |
4883 | if (TYPE_IS_FAT_POINTER_P (etype)) | |
86060344 EB |
4884 | expr |
4885 | = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (etype), false); | |
a1ab4c31 AC |
4886 | |
4887 | return fold (convert_to_pointer (type, expr)); | |
4888 | ||
4889 | case REAL_TYPE: | |
4890 | return fold (convert_to_real (type, expr)); | |
4891 | ||
4892 | case RECORD_TYPE: | |
4893 | if (TYPE_JUSTIFIED_MODULAR_P (type) && !AGGREGATE_TYPE_P (etype)) | |
0e228dd9 | 4894 | { |
9771b263 DN |
4895 | vec<constructor_elt, va_gc> *v; |
4896 | vec_alloc (v, 1); | |
0e228dd9 NF |
4897 | |
4898 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), | |
4899 | convert (TREE_TYPE (TYPE_FIELDS (type)), | |
4900 | expr)); | |
4901 | return gnat_build_constructor (type, v); | |
4902 | } | |
a1ab4c31 AC |
4903 | |
4904 | /* ... fall through ... */ | |
4905 | ||
4906 | case ARRAY_TYPE: | |
4907 | /* In these cases, assume the front-end has validated the conversion. | |
4908 | If the conversion is valid, it will be a bit-wise conversion, so | |
4909 | it can be viewed as an unchecked conversion. */ | |
4910 | return unchecked_convert (type, expr, false); | |
4911 | ||
4912 | case UNION_TYPE: | |
4913 | /* This is a either a conversion between a tagged type and some | |
4914 | subtype, which we have to mark as a UNION_TYPE because of | |
4915 | overlapping fields or a conversion of an Unchecked_Union. */ | |
4916 | return unchecked_convert (type, expr, false); | |
4917 | ||
4918 | case UNCONSTRAINED_ARRAY_TYPE: | |
7948ae37 OH |
4919 | /* If the input is a VECTOR_TYPE, convert to the representative |
4920 | array type first. */ | |
4921 | if (ecode == VECTOR_TYPE) | |
4922 | { | |
4923 | expr = convert (TYPE_REPRESENTATIVE_ARRAY (etype), expr); | |
4924 | etype = TREE_TYPE (expr); | |
4925 | ecode = TREE_CODE (etype); | |
4926 | } | |
4927 | ||
a1ab4c31 AC |
4928 | /* If EXPR is a constrained array, take its address, convert it to a |
4929 | fat pointer, and then dereference it. Likewise if EXPR is a | |
4930 | record containing both a template and a constrained array. | |
4931 | Note that a record representing a justified modular type | |
4932 | always represents a packed constrained array. */ | |
4933 | if (ecode == ARRAY_TYPE | |
4934 | || (ecode == INTEGER_TYPE && TYPE_HAS_ACTUAL_BOUNDS_P (etype)) | |
4935 | || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype)) | |
4936 | || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype))) | |
4937 | return | |
4938 | build_unary_op | |
4939 | (INDIRECT_REF, NULL_TREE, | |
4940 | convert_to_fat_pointer (TREE_TYPE (type), | |
4941 | build_unary_op (ADDR_EXPR, | |
4942 | NULL_TREE, expr))); | |
4943 | ||
4944 | /* Do something very similar for converting one unconstrained | |
4945 | array to another. */ | |
4946 | else if (ecode == UNCONSTRAINED_ARRAY_TYPE) | |
4947 | return | |
4948 | build_unary_op (INDIRECT_REF, NULL_TREE, | |
4949 | convert (TREE_TYPE (type), | |
4950 | build_unary_op (ADDR_EXPR, | |
4951 | NULL_TREE, expr))); | |
4952 | else | |
4953 | gcc_unreachable (); | |
4954 | ||
4955 | case COMPLEX_TYPE: | |
4956 | return fold (convert_to_complex (type, expr)); | |
4957 | ||
4958 | default: | |
4959 | gcc_unreachable (); | |
4960 | } | |
4961 | } | |
15bf7d19 EB |
4962 | |
4963 | /* Create an expression whose value is that of EXPR converted to the common | |
4964 | index type, which is sizetype. EXPR is supposed to be in the base type | |
4965 | of the GNAT index type. Calling it is equivalent to doing | |
4966 | ||
4967 | convert (sizetype, expr) | |
4968 | ||
4969 | but we try to distribute the type conversion with the knowledge that EXPR | |
4970 | cannot overflow in its type. This is a best-effort approach and we fall | |
4971 | back to the above expression as soon as difficulties are encountered. | |
4972 | ||
4973 | This is necessary to overcome issues that arise when the GNAT base index | |
4974 | type and the GCC common index type (sizetype) don't have the same size, | |
4975 | which is quite frequent on 64-bit architectures. In this case, and if | |
4976 | the GNAT base index type is signed but the iteration type of the loop has | |
4977 | been forced to unsigned, the loop scalar evolution engine cannot compute | |
4978 | a simple evolution for the general induction variables associated with the | |
4979 | array indices, because it will preserve the wrap-around semantics in the | |
4980 | unsigned type of their "inner" part. As a result, many loop optimizations | |
4981 | are blocked. | |
4982 | ||
4983 | The solution is to use a special (basic) induction variable that is at | |
4984 | least as large as sizetype, and to express the aforementioned general | |
4985 | induction variables in terms of this induction variable, eliminating | |
4986 | the problematic intermediate truncation to the GNAT base index type. | |
4987 | This is possible as long as the original expression doesn't overflow | |
4988 | and if the middle-end hasn't introduced artificial overflows in the | |
4989 | course of the various simplification it can make to the expression. */ | |
4990 | ||
4991 | tree | |
4992 | convert_to_index_type (tree expr) | |
4993 | { | |
4994 | enum tree_code code = TREE_CODE (expr); | |
4995 | tree type = TREE_TYPE (expr); | |
4996 | ||
4997 | /* If the type is unsigned, overflow is allowed so we cannot be sure that | |
4998 | EXPR doesn't overflow. Keep it simple if optimization is disabled. */ | |
4999 | if (TYPE_UNSIGNED (type) || !optimize) | |
5000 | return convert (sizetype, expr); | |
5001 | ||
5002 | switch (code) | |
5003 | { | |
5004 | case VAR_DECL: | |
5005 | /* The main effect of the function: replace a loop parameter with its | |
5006 | associated special induction variable. */ | |
5007 | if (DECL_LOOP_PARM_P (expr) && DECL_INDUCTION_VAR (expr)) | |
5008 | expr = DECL_INDUCTION_VAR (expr); | |
5009 | break; | |
5010 | ||
5011 | CASE_CONVERT: | |
5012 | { | |
5013 | tree otype = TREE_TYPE (TREE_OPERAND (expr, 0)); | |
5014 | /* Bail out as soon as we suspect some sort of type frobbing. */ | |
5015 | if (TYPE_PRECISION (type) != TYPE_PRECISION (otype) | |
5016 | || TYPE_UNSIGNED (type) != TYPE_UNSIGNED (otype)) | |
5017 | break; | |
5018 | } | |
5019 | ||
5020 | /* ... fall through ... */ | |
5021 | ||
5022 | case NON_LVALUE_EXPR: | |
5023 | return fold_build1 (code, sizetype, | |
5024 | convert_to_index_type (TREE_OPERAND (expr, 0))); | |
5025 | ||
5026 | case PLUS_EXPR: | |
5027 | case MINUS_EXPR: | |
5028 | case MULT_EXPR: | |
5029 | return fold_build2 (code, sizetype, | |
5030 | convert_to_index_type (TREE_OPERAND (expr, 0)), | |
5031 | convert_to_index_type (TREE_OPERAND (expr, 1))); | |
5032 | ||
5033 | case COMPOUND_EXPR: | |
5034 | return fold_build2 (code, sizetype, TREE_OPERAND (expr, 0), | |
5035 | convert_to_index_type (TREE_OPERAND (expr, 1))); | |
5036 | ||
5037 | case COND_EXPR: | |
5038 | return fold_build3 (code, sizetype, TREE_OPERAND (expr, 0), | |
5039 | convert_to_index_type (TREE_OPERAND (expr, 1)), | |
5040 | convert_to_index_type (TREE_OPERAND (expr, 2))); | |
5041 | ||
5042 | default: | |
5043 | break; | |
5044 | } | |
5045 | ||
5046 | return convert (sizetype, expr); | |
5047 | } | |
a1ab4c31 AC |
5048 | \f |
5049 | /* Remove all conversions that are done in EXP. This includes converting | |
5050 | from a padded type or to a justified modular type. If TRUE_ADDRESS | |
5051 | is true, always return the address of the containing object even if | |
5052 | the address is not bit-aligned. */ | |
5053 | ||
5054 | tree | |
5055 | remove_conversions (tree exp, bool true_address) | |
5056 | { | |
5057 | switch (TREE_CODE (exp)) | |
5058 | { | |
5059 | case CONSTRUCTOR: | |
5060 | if (true_address | |
5061 | && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
5062 | && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (exp))) | |
5063 | return | |
9771b263 | 5064 | remove_conversions ((*CONSTRUCTOR_ELTS (exp))[0].value, true); |
a1ab4c31 AC |
5065 | break; |
5066 | ||
5067 | case COMPONENT_REF: | |
315cff15 | 5068 | if (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
a1ab4c31 AC |
5069 | return remove_conversions (TREE_OPERAND (exp, 0), true_address); |
5070 | break; | |
5071 | ||
a1ab4c31 | 5072 | CASE_CONVERT: |
722356ce EB |
5073 | case VIEW_CONVERT_EXPR: |
5074 | case NON_LVALUE_EXPR: | |
a1ab4c31 AC |
5075 | return remove_conversions (TREE_OPERAND (exp, 0), true_address); |
5076 | ||
5077 | default: | |
5078 | break; | |
5079 | } | |
5080 | ||
5081 | return exp; | |
5082 | } | |
5083 | \f | |
5084 | /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that | |
86060344 | 5085 | refers to the underlying array. If it has TYPE_CONTAINS_TEMPLATE_P, |
a1ab4c31 AC |
5086 | likewise return an expression pointing to the underlying array. */ |
5087 | ||
5088 | tree | |
5089 | maybe_unconstrained_array (tree exp) | |
5090 | { | |
5091 | enum tree_code code = TREE_CODE (exp); | |
1aa291f7 | 5092 | tree type = TREE_TYPE (exp); |
a1ab4c31 | 5093 | |
1aa291f7 | 5094 | switch (TREE_CODE (type)) |
a1ab4c31 AC |
5095 | { |
5096 | case UNCONSTRAINED_ARRAY_TYPE: | |
5097 | if (code == UNCONSTRAINED_ARRAY_REF) | |
5098 | { | |
7e169899 | 5099 | const bool read_only = TREE_READONLY (exp); |
a1c7d797 EB |
5100 | const bool no_trap = TREE_THIS_NOTRAP (exp); |
5101 | ||
7e169899 | 5102 | exp = TREE_OPERAND (exp, 0); |
1aa291f7 EB |
5103 | type = TREE_TYPE (exp); |
5104 | ||
7e169899 EB |
5105 | if (TREE_CODE (exp) == COND_EXPR) |
5106 | { | |
5107 | tree op1 | |
5108 | = build_unary_op (INDIRECT_REF, NULL_TREE, | |
5109 | build_component_ref (TREE_OPERAND (exp, 1), | |
5110 | NULL_TREE, | |
1aa291f7 | 5111 | TYPE_FIELDS (type), |
7e169899 EB |
5112 | false)); |
5113 | tree op2 | |
5114 | = build_unary_op (INDIRECT_REF, NULL_TREE, | |
5115 | build_component_ref (TREE_OPERAND (exp, 2), | |
5116 | NULL_TREE, | |
1aa291f7 | 5117 | TYPE_FIELDS (type), |
7e169899 EB |
5118 | false)); |
5119 | ||
5120 | exp = build3 (COND_EXPR, | |
1aa291f7 | 5121 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS (type))), |
7e169899 EB |
5122 | TREE_OPERAND (exp, 0), op1, op2); |
5123 | } | |
5124 | else | |
a1c7d797 EB |
5125 | { |
5126 | exp = build_unary_op (INDIRECT_REF, NULL_TREE, | |
5127 | build_component_ref (exp, NULL_TREE, | |
1aa291f7 | 5128 | TYPE_FIELDS (type), |
a1c7d797 EB |
5129 | false)); |
5130 | TREE_READONLY (exp) = read_only; | |
5131 | TREE_THIS_NOTRAP (exp) = no_trap; | |
5132 | } | |
a1ab4c31 AC |
5133 | } |
5134 | ||
5135 | else if (code == NULL_EXPR) | |
1aa291f7 EB |
5136 | exp = build1 (NULL_EXPR, |
5137 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))), | |
5138 | TREE_OPERAND (exp, 0)); | |
5139 | break; | |
a1ab4c31 AC |
5140 | |
5141 | case RECORD_TYPE: | |
1aa291f7 EB |
5142 | /* If this is a padded type and it contains a template, convert to the |
5143 | unpadded type first. */ | |
5144 | if (TYPE_PADDING_P (type) | |
5145 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == RECORD_TYPE | |
5146 | && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (TYPE_FIELDS (type)))) | |
a1ab4c31 | 5147 | { |
1aa291f7 EB |
5148 | exp = convert (TREE_TYPE (TYPE_FIELDS (type)), exp); |
5149 | type = TREE_TYPE (exp); | |
5150 | } | |
5151 | ||
5152 | if (TYPE_CONTAINS_TEMPLATE_P (type)) | |
5153 | { | |
5154 | exp = build_component_ref (exp, NULL_TREE, | |
5155 | DECL_CHAIN (TYPE_FIELDS (type)), | |
5156 | false); | |
5157 | type = TREE_TYPE (exp); | |
5158 | ||
5159 | /* If the array type is padded, convert to the unpadded type. */ | |
5160 | if (TYPE_IS_PADDING_P (type)) | |
5161 | exp = convert (TREE_TYPE (TYPE_FIELDS (type)), exp); | |
a1ab4c31 | 5162 | } |
a1ab4c31 AC |
5163 | break; |
5164 | ||
5165 | default: | |
5166 | break; | |
5167 | } | |
5168 | ||
5169 | return exp; | |
5170 | } | |
5171 | \f | |
afcea859 | 5172 | /* Return true if EXPR is an expression that can be folded as an operand |
84fb43a1 | 5173 | of a VIEW_CONVERT_EXPR. See ada-tree.h for a complete rationale. */ |
afcea859 EB |
5174 | |
5175 | static bool | |
5176 | can_fold_for_view_convert_p (tree expr) | |
5177 | { | |
5178 | tree t1, t2; | |
5179 | ||
5180 | /* The folder will fold NOP_EXPRs between integral types with the same | |
5181 | precision (in the middle-end's sense). We cannot allow it if the | |
5182 | types don't have the same precision in the Ada sense as well. */ | |
5183 | if (TREE_CODE (expr) != NOP_EXPR) | |
5184 | return true; | |
5185 | ||
5186 | t1 = TREE_TYPE (expr); | |
5187 | t2 = TREE_TYPE (TREE_OPERAND (expr, 0)); | |
5188 | ||
5189 | /* Defer to the folder for non-integral conversions. */ | |
5190 | if (!(INTEGRAL_TYPE_P (t1) && INTEGRAL_TYPE_P (t2))) | |
5191 | return true; | |
5192 | ||
5193 | /* Only fold conversions that preserve both precisions. */ | |
5194 | if (TYPE_PRECISION (t1) == TYPE_PRECISION (t2) | |
5195 | && operand_equal_p (rm_size (t1), rm_size (t2), 0)) | |
5196 | return true; | |
5197 | ||
5198 | return false; | |
5199 | } | |
5200 | ||
a1ab4c31 | 5201 | /* Return an expression that does an unchecked conversion of EXPR to TYPE. |
afcea859 EB |
5202 | If NOTRUNC_P is true, truncation operations should be suppressed. |
5203 | ||
5204 | Special care is required with (source or target) integral types whose | |
5205 | precision is not equal to their size, to make sure we fetch or assign | |
5206 | the value bits whose location might depend on the endianness, e.g. | |
5207 | ||
5208 | Rmsize : constant := 8; | |
5209 | subtype Int is Integer range 0 .. 2 ** Rmsize - 1; | |
5210 | ||
5211 | type Bit_Array is array (1 .. Rmsize) of Boolean; | |
5212 | pragma Pack (Bit_Array); | |
5213 | ||
5214 | function To_Bit_Array is new Unchecked_Conversion (Int, Bit_Array); | |
5215 | ||
5216 | Value : Int := 2#1000_0001#; | |
5217 | Vbits : Bit_Array := To_Bit_Array (Value); | |
5218 | ||
5219 | we expect the 8 bits at Vbits'Address to always contain Value, while | |
5220 | their original location depends on the endianness, at Value'Address | |
84fb43a1 | 5221 | on a little-endian architecture but not on a big-endian one. */ |
a1ab4c31 AC |
5222 | |
5223 | tree | |
5224 | unchecked_convert (tree type, tree expr, bool notrunc_p) | |
5225 | { | |
5226 | tree etype = TREE_TYPE (expr); | |
c34f3839 EB |
5227 | enum tree_code ecode = TREE_CODE (etype); |
5228 | enum tree_code code = TREE_CODE (type); | |
980a0501 | 5229 | int c; |
a1ab4c31 | 5230 | |
c34f3839 | 5231 | /* If the expression is already of the right type, we are done. */ |
a1ab4c31 AC |
5232 | if (etype == type) |
5233 | return expr; | |
5234 | ||
5235 | /* If both types types are integral just do a normal conversion. | |
5236 | Likewise for a conversion to an unconstrained array. */ | |
5237 | if ((((INTEGRAL_TYPE_P (type) | |
c34f3839 | 5238 | && !(code == INTEGER_TYPE && TYPE_VAX_FLOATING_POINT_P (type))) |
0d7de0e1 | 5239 | || (POINTER_TYPE_P (type) && !TYPE_IS_THIN_POINTER_P (type)) |
c34f3839 | 5240 | || (code == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (type))) |
a1ab4c31 | 5241 | && ((INTEGRAL_TYPE_P (etype) |
c34f3839 | 5242 | && !(ecode == INTEGER_TYPE && TYPE_VAX_FLOATING_POINT_P (etype))) |
315cff15 | 5243 | || (POINTER_TYPE_P (etype) && !TYPE_IS_THIN_POINTER_P (etype)) |
c34f3839 EB |
5244 | || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype)))) |
5245 | || code == UNCONSTRAINED_ARRAY_TYPE) | |
a1ab4c31 | 5246 | { |
c34f3839 | 5247 | if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype)) |
a1ab4c31 AC |
5248 | { |
5249 | tree ntype = copy_type (etype); | |
a1ab4c31 AC |
5250 | TYPE_BIASED_REPRESENTATION_P (ntype) = 0; |
5251 | TYPE_MAIN_VARIANT (ntype) = ntype; | |
5252 | expr = build1 (NOP_EXPR, ntype, expr); | |
5253 | } | |
5254 | ||
c34f3839 | 5255 | if (code == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (type)) |
a1ab4c31 | 5256 | { |
afcea859 | 5257 | tree rtype = copy_type (type); |
a1ab4c31 AC |
5258 | TYPE_BIASED_REPRESENTATION_P (rtype) = 0; |
5259 | TYPE_MAIN_VARIANT (rtype) = rtype; | |
afcea859 EB |
5260 | expr = convert (rtype, expr); |
5261 | expr = build1 (NOP_EXPR, type, expr); | |
a1ab4c31 | 5262 | } |
afcea859 EB |
5263 | else |
5264 | expr = convert (type, expr); | |
a1ab4c31 AC |
5265 | } |
5266 | ||
afcea859 | 5267 | /* If we are converting to an integral type whose precision is not equal |
416de7d5 EB |
5268 | to its size, first unchecked convert to a record type that contains an |
5269 | field of the given precision. Then extract the field. */ | |
980a0501 EB |
5270 | else if (INTEGRAL_TYPE_P (type) |
5271 | && TYPE_RM_SIZE (type) | |
a1ab4c31 AC |
5272 | && 0 != compare_tree_int (TYPE_RM_SIZE (type), |
5273 | GET_MODE_BITSIZE (TYPE_MODE (type)))) | |
5274 | { | |
5275 | tree rec_type = make_node (RECORD_TYPE); | |
416de7d5 EB |
5276 | unsigned HOST_WIDE_INT prec = TREE_INT_CST_LOW (TYPE_RM_SIZE (type)); |
5277 | tree field_type, field; | |
5278 | ||
5279 | if (TYPE_UNSIGNED (type)) | |
5280 | field_type = make_unsigned_type (prec); | |
5281 | else | |
5282 | field_type = make_signed_type (prec); | |
5283 | SET_TYPE_RM_SIZE (field_type, TYPE_RM_SIZE (type)); | |
5284 | ||
5285 | field = create_field_decl (get_identifier ("OBJ"), field_type, rec_type, | |
5286 | NULL_TREE, NULL_TREE, 1, 0); | |
a1ab4c31 AC |
5287 | |
5288 | TYPE_FIELDS (rec_type) = field; | |
5289 | layout_type (rec_type); | |
5290 | ||
5291 | expr = unchecked_convert (rec_type, expr, notrunc_p); | |
3cd64bab | 5292 | expr = build_component_ref (expr, NULL_TREE, field, false); |
416de7d5 | 5293 | expr = fold_build1 (NOP_EXPR, type, expr); |
a1ab4c31 AC |
5294 | } |
5295 | ||
416de7d5 EB |
5296 | /* Similarly if we are converting from an integral type whose precision is |
5297 | not equal to its size, first copy into a field of the given precision | |
5298 | and unchecked convert the record type. */ | |
980a0501 EB |
5299 | else if (INTEGRAL_TYPE_P (etype) |
5300 | && TYPE_RM_SIZE (etype) | |
5301 | && 0 != compare_tree_int (TYPE_RM_SIZE (etype), | |
5302 | GET_MODE_BITSIZE (TYPE_MODE (etype)))) | |
a1ab4c31 AC |
5303 | { |
5304 | tree rec_type = make_node (RECORD_TYPE); | |
416de7d5 | 5305 | unsigned HOST_WIDE_INT prec = TREE_INT_CST_LOW (TYPE_RM_SIZE (etype)); |
9771b263 DN |
5306 | vec<constructor_elt, va_gc> *v; |
5307 | vec_alloc (v, 1); | |
416de7d5 EB |
5308 | tree field_type, field; |
5309 | ||
5310 | if (TYPE_UNSIGNED (etype)) | |
5311 | field_type = make_unsigned_type (prec); | |
5312 | else | |
5313 | field_type = make_signed_type (prec); | |
5314 | SET_TYPE_RM_SIZE (field_type, TYPE_RM_SIZE (etype)); | |
5315 | ||
5316 | field = create_field_decl (get_identifier ("OBJ"), field_type, rec_type, | |
5317 | NULL_TREE, NULL_TREE, 1, 0); | |
a1ab4c31 AC |
5318 | |
5319 | TYPE_FIELDS (rec_type) = field; | |
5320 | layout_type (rec_type); | |
5321 | ||
416de7d5 | 5322 | expr = fold_build1 (NOP_EXPR, field_type, expr); |
0e228dd9 NF |
5323 | CONSTRUCTOR_APPEND_ELT (v, field, expr); |
5324 | expr = gnat_build_constructor (rec_type, v); | |
a1ab4c31 AC |
5325 | expr = unchecked_convert (type, expr, notrunc_p); |
5326 | } | |
5327 | ||
980a0501 EB |
5328 | /* If we are converting from a scalar type to a type with a different size, |
5329 | we need to pad to have the same size on both sides. | |
5330 | ||
5331 | ??? We cannot do it unconditionally because unchecked conversions are | |
5332 | used liberally by the front-end to implement polymorphism, e.g. in: | |
5333 | ||
5334 | S191s : constant ada__tags__addr_ptr := ada__tags__addr_ptr!(S190s); | |
5335 | return p___size__4 (p__object!(S191s.all)); | |
5336 | ||
5337 | so we skip all expressions that are references. */ | |
5338 | else if (!REFERENCE_CLASS_P (expr) | |
5339 | && !AGGREGATE_TYPE_P (etype) | |
5340 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST | |
5341 | && (c = tree_int_cst_compare (TYPE_SIZE (etype), TYPE_SIZE (type)))) | |
5342 | { | |
5343 | if (c < 0) | |
5344 | { | |
5345 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, | |
5346 | false, false, false, true), | |
5347 | expr); | |
5348 | expr = unchecked_convert (type, expr, notrunc_p); | |
5349 | } | |
5350 | else | |
5351 | { | |
5352 | tree rec_type = maybe_pad_type (type, TYPE_SIZE (etype), 0, Empty, | |
5353 | false, false, false, true); | |
5354 | expr = unchecked_convert (rec_type, expr, notrunc_p); | |
5355 | expr = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (rec_type), | |
5356 | false); | |
5357 | } | |
5358 | } | |
5359 | ||
7948ae37 OH |
5360 | /* We have a special case when we are converting between two unconstrained |
5361 | array types. In that case, take the address, convert the fat pointer | |
5362 | types, and dereference. */ | |
c34f3839 | 5363 | else if (ecode == code && code == UNCONSTRAINED_ARRAY_TYPE) |
a1ab4c31 AC |
5364 | expr = build_unary_op (INDIRECT_REF, NULL_TREE, |
5365 | build1 (VIEW_CONVERT_EXPR, TREE_TYPE (type), | |
5366 | build_unary_op (ADDR_EXPR, NULL_TREE, | |
5367 | expr))); | |
7948ae37 OH |
5368 | |
5369 | /* Another special case is when we are converting to a vector type from its | |
5370 | representative array type; this a regular conversion. */ | |
c34f3839 EB |
5371 | else if (code == VECTOR_TYPE |
5372 | && ecode == ARRAY_TYPE | |
7948ae37 OH |
5373 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), |
5374 | etype)) | |
5375 | expr = convert (type, expr); | |
5376 | ||
a1ab4c31 AC |
5377 | else |
5378 | { | |
5379 | expr = maybe_unconstrained_array (expr); | |
5380 | etype = TREE_TYPE (expr); | |
c34f3839 | 5381 | ecode = TREE_CODE (etype); |
afcea859 EB |
5382 | if (can_fold_for_view_convert_p (expr)) |
5383 | expr = fold_build1 (VIEW_CONVERT_EXPR, type, expr); | |
5384 | else | |
5385 | expr = build1 (VIEW_CONVERT_EXPR, type, expr); | |
a1ab4c31 AC |
5386 | } |
5387 | ||
afcea859 EB |
5388 | /* If the result is an integral type whose precision is not equal to its |
5389 | size, sign- or zero-extend the result. We need not do this if the input | |
5390 | is an integral type of the same precision and signedness or if the output | |
a1ab4c31 AC |
5391 | is a biased type or if both the input and output are unsigned. */ |
5392 | if (!notrunc_p | |
5393 | && INTEGRAL_TYPE_P (type) && TYPE_RM_SIZE (type) | |
c34f3839 | 5394 | && !(code == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (type)) |
a1ab4c31 AC |
5395 | && 0 != compare_tree_int (TYPE_RM_SIZE (type), |
5396 | GET_MODE_BITSIZE (TYPE_MODE (type))) | |
5397 | && !(INTEGRAL_TYPE_P (etype) | |
5398 | && TYPE_UNSIGNED (type) == TYPE_UNSIGNED (etype) | |
5399 | && operand_equal_p (TYPE_RM_SIZE (type), | |
5400 | (TYPE_RM_SIZE (etype) != 0 | |
5401 | ? TYPE_RM_SIZE (etype) : TYPE_SIZE (etype)), | |
5402 | 0)) | |
5403 | && !(TYPE_UNSIGNED (type) && TYPE_UNSIGNED (etype))) | |
5404 | { | |
c34f3839 EB |
5405 | tree base_type |
5406 | = gnat_type_for_mode (TYPE_MODE (type), TYPE_UNSIGNED (type)); | |
a1ab4c31 AC |
5407 | tree shift_expr |
5408 | = convert (base_type, | |
5409 | size_binop (MINUS_EXPR, | |
5410 | bitsize_int | |
5411 | (GET_MODE_BITSIZE (TYPE_MODE (type))), | |
5412 | TYPE_RM_SIZE (type))); | |
5413 | expr | |
5414 | = convert (type, | |
5415 | build_binary_op (RSHIFT_EXPR, base_type, | |
5416 | build_binary_op (LSHIFT_EXPR, base_type, | |
5417 | convert (base_type, expr), | |
5418 | shift_expr), | |
5419 | shift_expr)); | |
5420 | } | |
5421 | ||
5422 | /* An unchecked conversion should never raise Constraint_Error. The code | |
5423 | below assumes that GCC's conversion routines overflow the same way that | |
5424 | the underlying hardware does. This is probably true. In the rare case | |
5425 | when it is false, we can rely on the fact that such conversions are | |
5426 | erroneous anyway. */ | |
5427 | if (TREE_CODE (expr) == INTEGER_CST) | |
5428 | TREE_OVERFLOW (expr) = 0; | |
5429 | ||
5430 | /* If the sizes of the types differ and this is an VIEW_CONVERT_EXPR, | |
5431 | show no longer constant. */ | |
5432 | if (TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
5433 | && !operand_equal_p (TYPE_SIZE_UNIT (type), TYPE_SIZE_UNIT (etype), | |
5434 | OEP_ONLY_CONST)) | |
5435 | TREE_CONSTANT (expr) = 0; | |
5436 | ||
5437 | return expr; | |
5438 | } | |
5439 | \f | |
feec4372 | 5440 | /* Return the appropriate GCC tree code for the specified GNAT_TYPE, |
a1ab4c31 AC |
5441 | the latter being a record type as predicated by Is_Record_Type. */ |
5442 | ||
5443 | enum tree_code | |
5444 | tree_code_for_record_type (Entity_Id gnat_type) | |
5445 | { | |
b1a785fb | 5446 | Node_Id component_list, component; |
a1ab4c31 | 5447 | |
b1a785fb EB |
5448 | /* Return UNION_TYPE if it's an Unchecked_Union whose non-discriminant |
5449 | fields are all in the variant part. Otherwise, return RECORD_TYPE. */ | |
a1ab4c31 AC |
5450 | if (!Is_Unchecked_Union (gnat_type)) |
5451 | return RECORD_TYPE; | |
5452 | ||
b1a785fb EB |
5453 | gnat_type = Implementation_Base_Type (gnat_type); |
5454 | component_list | |
5455 | = Component_List (Type_Definition (Declaration_Node (gnat_type))); | |
5456 | ||
a1ab4c31 AC |
5457 | for (component = First_Non_Pragma (Component_Items (component_list)); |
5458 | Present (component); | |
5459 | component = Next_Non_Pragma (component)) | |
5460 | if (Ekind (Defining_Entity (component)) == E_Component) | |
5461 | return RECORD_TYPE; | |
5462 | ||
5463 | return UNION_TYPE; | |
5464 | } | |
5465 | ||
caa9d12a EB |
5466 | /* Return true if GNAT_TYPE is a "double" floating-point type, i.e. whose |
5467 | size is equal to 64 bits, or an array of such a type. Set ALIGN_CLAUSE | |
5468 | according to the presence of an alignment clause on the type or, if it | |
5469 | is an array, on the component type. */ | |
5470 | ||
5471 | bool | |
5472 | is_double_float_or_array (Entity_Id gnat_type, bool *align_clause) | |
5473 | { | |
5474 | gnat_type = Underlying_Type (gnat_type); | |
5475 | ||
5476 | *align_clause = Present (Alignment_Clause (gnat_type)); | |
5477 | ||
5478 | if (Is_Array_Type (gnat_type)) | |
5479 | { | |
5480 | gnat_type = Underlying_Type (Component_Type (gnat_type)); | |
5481 | if (Present (Alignment_Clause (gnat_type))) | |
5482 | *align_clause = true; | |
5483 | } | |
5484 | ||
5485 | if (!Is_Floating_Point_Type (gnat_type)) | |
5486 | return false; | |
5487 | ||
5488 | if (UI_To_Int (Esize (gnat_type)) != 64) | |
5489 | return false; | |
5490 | ||
5491 | return true; | |
5492 | } | |
5493 | ||
5494 | /* Return true if GNAT_TYPE is a "double" or larger scalar type, i.e. whose | |
5495 | size is greater or equal to 64 bits, or an array of such a type. Set | |
5496 | ALIGN_CLAUSE according to the presence of an alignment clause on the | |
5497 | type or, if it is an array, on the component type. */ | |
5498 | ||
5499 | bool | |
5500 | is_double_scalar_or_array (Entity_Id gnat_type, bool *align_clause) | |
5501 | { | |
5502 | gnat_type = Underlying_Type (gnat_type); | |
5503 | ||
5504 | *align_clause = Present (Alignment_Clause (gnat_type)); | |
5505 | ||
5506 | if (Is_Array_Type (gnat_type)) | |
5507 | { | |
5508 | gnat_type = Underlying_Type (Component_Type (gnat_type)); | |
5509 | if (Present (Alignment_Clause (gnat_type))) | |
5510 | *align_clause = true; | |
5511 | } | |
5512 | ||
5513 | if (!Is_Scalar_Type (gnat_type)) | |
5514 | return false; | |
5515 | ||
5516 | if (UI_To_Int (Esize (gnat_type)) < 64) | |
5517 | return false; | |
5518 | ||
5519 | return true; | |
5520 | } | |
5521 | ||
a1ab4c31 AC |
5522 | /* Return true if GNU_TYPE is suitable as the type of a non-aliased |
5523 | component of an aggregate type. */ | |
5524 | ||
5525 | bool | |
5526 | type_for_nonaliased_component_p (tree gnu_type) | |
5527 | { | |
5528 | /* If the type is passed by reference, we may have pointers to the | |
5529 | component so it cannot be made non-aliased. */ | |
5530 | if (must_pass_by_ref (gnu_type) || default_pass_by_ref (gnu_type)) | |
5531 | return false; | |
5532 | ||
5533 | /* We used to say that any component of aggregate type is aliased | |
5534 | because the front-end may take 'Reference of it. The front-end | |
5535 | has been enhanced in the meantime so as to use a renaming instead | |
5536 | in most cases, but the back-end can probably take the address of | |
5537 | such a component too so we go for the conservative stance. | |
5538 | ||
5539 | For instance, we might need the address of any array type, even | |
5540 | if normally passed by copy, to construct a fat pointer if the | |
5541 | component is used as an actual for an unconstrained formal. | |
5542 | ||
5543 | Likewise for record types: even if a specific record subtype is | |
5544 | passed by copy, the parent type might be passed by ref (e.g. if | |
5545 | it's of variable size) and we might take the address of a child | |
5546 | component to pass to a parent formal. We have no way to check | |
5547 | for such conditions here. */ | |
5548 | if (AGGREGATE_TYPE_P (gnu_type)) | |
5549 | return false; | |
5550 | ||
5551 | return true; | |
5552 | } | |
5553 | ||
bb1f7929 EB |
5554 | /* Return true if TYPE is a smaller form of ORIG_TYPE. */ |
5555 | ||
5556 | bool | |
5557 | smaller_form_type_p (tree type, tree orig_type) | |
5558 | { | |
5559 | tree size, osize; | |
5560 | ||
5561 | /* We're not interested in variants here. */ | |
5562 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (orig_type)) | |
5563 | return false; | |
5564 | ||
5565 | /* Like a variant, a packable version keeps the original TYPE_NAME. */ | |
5566 | if (TYPE_NAME (type) != TYPE_NAME (orig_type)) | |
5567 | return false; | |
5568 | ||
5569 | size = TYPE_SIZE (type); | |
5570 | osize = TYPE_SIZE (orig_type); | |
5571 | ||
5572 | if (!(TREE_CODE (size) == INTEGER_CST && TREE_CODE (osize) == INTEGER_CST)) | |
5573 | return false; | |
5574 | ||
5575 | return tree_int_cst_lt (size, osize) != 0; | |
5576 | } | |
5577 | ||
a1ab4c31 AC |
5578 | /* Perform final processing on global variables. */ |
5579 | ||
65444786 EB |
5580 | static GTY (()) tree dummy_global; |
5581 | ||
a1ab4c31 AC |
5582 | void |
5583 | gnat_write_global_declarations (void) | |
5584 | { | |
10e4d056 EB |
5585 | unsigned int i; |
5586 | tree iter; | |
5587 | ||
65444786 EB |
5588 | /* If we have declared types as used at the global level, insert them in |
5589 | the global hash table. We use a dummy variable for this purpose. */ | |
9771b263 | 5590 | if (types_used_by_cur_var_decl && !types_used_by_cur_var_decl->is_empty ()) |
65444786 | 5591 | { |
35e8bcf4 | 5592 | struct varpool_node *node; |
d3c268ab EB |
5593 | char *label; |
5594 | ||
5595 | ASM_FORMAT_PRIVATE_NAME (label, first_global_object_name, 0); | |
65444786 | 5596 | dummy_global |
d3c268ab EB |
5597 | = build_decl (BUILTINS_LOCATION, VAR_DECL, get_identifier (label), |
5598 | void_type_node); | |
65444786 EB |
5599 | TREE_STATIC (dummy_global) = 1; |
5600 | TREE_ASM_WRITTEN (dummy_global) = 1; | |
5d59b5e1 | 5601 | node = varpool_node_for_decl (dummy_global); |
ead84f73 | 5602 | node->symbol.force_output = 1; |
65444786 | 5603 | |
9771b263 | 5604 | while (!types_used_by_cur_var_decl->is_empty ()) |
65444786 | 5605 | { |
9771b263 | 5606 | tree t = types_used_by_cur_var_decl->pop (); |
65444786 EB |
5607 | types_used_by_var_decl_insert (t, dummy_global); |
5608 | } | |
5609 | } | |
5610 | ||
10e4d056 EB |
5611 | /* Output debug information for all global type declarations first. This |
5612 | ensures that global types whose compilation hasn't been finalized yet, | |
5613 | for example pointers to Taft amendment types, have their compilation | |
5614 | finalized in the right context. */ | |
9771b263 | 5615 | FOR_EACH_VEC_SAFE_ELT (global_decls, i, iter) |
10e4d056 EB |
5616 | if (TREE_CODE (iter) == TYPE_DECL) |
5617 | debug_hooks->global_decl (iter); | |
5618 | ||
65d630d4 JH |
5619 | /* Proceed to optimize and emit assembly. */ |
5620 | finalize_compilation_unit (); | |
a1ab4c31 | 5621 | |
10e4d056 EB |
5622 | /* After cgraph has had a chance to emit everything that's going to |
5623 | be emitted, output debug information for the rest of globals. */ | |
5624 | if (!seen_error ()) | |
5625 | { | |
5626 | timevar_push (TV_SYMOUT); | |
9771b263 | 5627 | FOR_EACH_VEC_SAFE_ELT (global_decls, i, iter) |
10e4d056 EB |
5628 | if (TREE_CODE (iter) != TYPE_DECL) |
5629 | debug_hooks->global_decl (iter); | |
5630 | timevar_pop (TV_SYMOUT); | |
5631 | } | |
a1ab4c31 AC |
5632 | } |
5633 | ||
5634 | /* ************************************************************************ | |
5635 | * * GCC builtins support * | |
5636 | * ************************************************************************ */ | |
5637 | ||
5638 | /* The general scheme is fairly simple: | |
5639 | ||
5640 | For each builtin function/type to be declared, gnat_install_builtins calls | |
5641 | internal facilities which eventually get to gnat_push_decl, which in turn | |
5642 | tracks the so declared builtin function decls in the 'builtin_decls' global | |
5643 | datastructure. When an Intrinsic subprogram declaration is processed, we | |
5644 | search this global datastructure to retrieve the associated BUILT_IN DECL | |
5645 | node. */ | |
5646 | ||
5647 | /* Search the chain of currently available builtin declarations for a node | |
5648 | corresponding to function NAME (an IDENTIFIER_NODE). Return the first node | |
5649 | found, if any, or NULL_TREE otherwise. */ | |
5650 | tree | |
5651 | builtin_decl_for (tree name) | |
5652 | { | |
5653 | unsigned i; | |
5654 | tree decl; | |
5655 | ||
9771b263 | 5656 | FOR_EACH_VEC_SAFE_ELT (builtin_decls, i, decl) |
a1ab4c31 AC |
5657 | if (DECL_NAME (decl) == name) |
5658 | return decl; | |
5659 | ||
5660 | return NULL_TREE; | |
5661 | } | |
5662 | ||
5663 | /* The code below eventually exposes gnat_install_builtins, which declares | |
5664 | the builtin types and functions we might need, either internally or as | |
5665 | user accessible facilities. | |
5666 | ||
5667 | ??? This is a first implementation shot, still in rough shape. It is | |
5668 | heavily inspired from the "C" family implementation, with chunks copied | |
5669 | verbatim from there. | |
5670 | ||
5671 | Two obvious TODO candidates are | |
5672 | o Use a more efficient name/decl mapping scheme | |
5673 | o Devise a middle-end infrastructure to avoid having to copy | |
5674 | pieces between front-ends. */ | |
5675 | ||
5676 | /* ----------------------------------------------------------------------- * | |
5677 | * BUILTIN ELEMENTARY TYPES * | |
5678 | * ----------------------------------------------------------------------- */ | |
5679 | ||
5680 | /* Standard data types to be used in builtin argument declarations. */ | |
5681 | ||
5682 | enum c_tree_index | |
5683 | { | |
5684 | CTI_SIGNED_SIZE_TYPE, /* For format checking only. */ | |
5685 | CTI_STRING_TYPE, | |
5686 | CTI_CONST_STRING_TYPE, | |
5687 | ||
5688 | CTI_MAX | |
5689 | }; | |
5690 | ||
5691 | static tree c_global_trees[CTI_MAX]; | |
5692 | ||
5693 | #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE] | |
5694 | #define string_type_node c_global_trees[CTI_STRING_TYPE] | |
5695 | #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE] | |
5696 | ||
5697 | /* ??? In addition some attribute handlers, we currently don't support a | |
5698 | (small) number of builtin-types, which in turns inhibits support for a | |
5699 | number of builtin functions. */ | |
5700 | #define wint_type_node void_type_node | |
5701 | #define intmax_type_node void_type_node | |
5702 | #define uintmax_type_node void_type_node | |
5703 | ||
5704 | /* Build the void_list_node (void_type_node having been created). */ | |
5705 | ||
5706 | static tree | |
5707 | build_void_list_node (void) | |
5708 | { | |
5709 | tree t = build_tree_list (NULL_TREE, void_type_node); | |
5710 | return t; | |
5711 | } | |
5712 | ||
5713 | /* Used to help initialize the builtin-types.def table. When a type of | |
5714 | the correct size doesn't exist, use error_mark_node instead of NULL. | |
5715 | The later results in segfaults even when a decl using the type doesn't | |
5716 | get invoked. */ | |
5717 | ||
5718 | static tree | |
5719 | builtin_type_for_size (int size, bool unsignedp) | |
5720 | { | |
ced57283 | 5721 | tree type = gnat_type_for_size (size, unsignedp); |
a1ab4c31 AC |
5722 | return type ? type : error_mark_node; |
5723 | } | |
5724 | ||
5725 | /* Build/push the elementary type decls that builtin functions/types | |
5726 | will need. */ | |
5727 | ||
5728 | static void | |
5729 | install_builtin_elementary_types (void) | |
5730 | { | |
728936bb | 5731 | signed_size_type_node = gnat_signed_type (size_type_node); |
a1ab4c31 AC |
5732 | pid_type_node = integer_type_node; |
5733 | void_list_node = build_void_list_node (); | |
5734 | ||
5735 | string_type_node = build_pointer_type (char_type_node); | |
5736 | const_string_type_node | |
5737 | = build_pointer_type (build_qualified_type | |
5738 | (char_type_node, TYPE_QUAL_CONST)); | |
5739 | } | |
5740 | ||
5741 | /* ----------------------------------------------------------------------- * | |
5742 | * BUILTIN FUNCTION TYPES * | |
5743 | * ----------------------------------------------------------------------- */ | |
5744 | ||
5745 | /* Now, builtin function types per se. */ | |
5746 | ||
5747 | enum c_builtin_type | |
5748 | { | |
5749 | #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, | |
5750 | #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, | |
5751 | #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, | |
5752 | #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, | |
5753 | #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
5754 | #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
5755 | #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME, | |
5756 | #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME, | |
5757 | #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME, | |
5758 | #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, | |
5759 | #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, | |
5760 | #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, | |
5761 | #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
5762 | #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
5763 | #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \ | |
5764 | NAME, | |
5765 | #define DEF_POINTER_TYPE(NAME, TYPE) NAME, | |
5766 | #include "builtin-types.def" | |
5767 | #undef DEF_PRIMITIVE_TYPE | |
5768 | #undef DEF_FUNCTION_TYPE_0 | |
5769 | #undef DEF_FUNCTION_TYPE_1 | |
5770 | #undef DEF_FUNCTION_TYPE_2 | |
5771 | #undef DEF_FUNCTION_TYPE_3 | |
5772 | #undef DEF_FUNCTION_TYPE_4 | |
5773 | #undef DEF_FUNCTION_TYPE_5 | |
5774 | #undef DEF_FUNCTION_TYPE_6 | |
5775 | #undef DEF_FUNCTION_TYPE_7 | |
5776 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
5777 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
5778 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
5779 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
5780 | #undef DEF_FUNCTION_TYPE_VAR_4 | |
5781 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
5782 | #undef DEF_POINTER_TYPE | |
5783 | BT_LAST | |
5784 | }; | |
5785 | ||
5786 | typedef enum c_builtin_type builtin_type; | |
5787 | ||
5788 | /* A temporary array used in communication with def_fn_type. */ | |
5789 | static GTY(()) tree builtin_types[(int) BT_LAST + 1]; | |
5790 | ||
5791 | /* A helper function for install_builtin_types. Build function type | |
5792 | for DEF with return type RET and N arguments. If VAR is true, then the | |
5793 | function should be variadic after those N arguments. | |
5794 | ||
5795 | Takes special care not to ICE if any of the types involved are | |
5796 | error_mark_node, which indicates that said type is not in fact available | |
5797 | (see builtin_type_for_size). In which case the function type as a whole | |
5798 | should be error_mark_node. */ | |
5799 | ||
5800 | static void | |
5801 | def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...) | |
5802 | { | |
e5b00edf NF |
5803 | tree t; |
5804 | tree *args = XALLOCAVEC (tree, n); | |
a1ab4c31 AC |
5805 | va_list list; |
5806 | int i; | |
5807 | ||
5808 | va_start (list, n); | |
5809 | for (i = 0; i < n; ++i) | |
5810 | { | |
c6bd4220 | 5811 | builtin_type a = (builtin_type) va_arg (list, int); |
a1ab4c31 AC |
5812 | t = builtin_types[a]; |
5813 | if (t == error_mark_node) | |
5814 | goto egress; | |
e5b00edf | 5815 | args[i] = t; |
a1ab4c31 | 5816 | } |
a1ab4c31 | 5817 | |
a1ab4c31 AC |
5818 | t = builtin_types[ret]; |
5819 | if (t == error_mark_node) | |
5820 | goto egress; | |
e5b00edf NF |
5821 | if (var) |
5822 | t = build_varargs_function_type_array (t, n, args); | |
5823 | else | |
5824 | t = build_function_type_array (t, n, args); | |
a1ab4c31 AC |
5825 | |
5826 | egress: | |
5827 | builtin_types[def] = t; | |
0edf1bb2 | 5828 | va_end (list); |
a1ab4c31 AC |
5829 | } |
5830 | ||
5831 | /* Build the builtin function types and install them in the builtin_types | |
5832 | array for later use in builtin function decls. */ | |
5833 | ||
5834 | static void | |
5835 | install_builtin_function_types (void) | |
5836 | { | |
5837 | tree va_list_ref_type_node; | |
5838 | tree va_list_arg_type_node; | |
5839 | ||
5840 | if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) | |
5841 | { | |
5842 | va_list_arg_type_node = va_list_ref_type_node = | |
5843 | build_pointer_type (TREE_TYPE (va_list_type_node)); | |
5844 | } | |
5845 | else | |
5846 | { | |
5847 | va_list_arg_type_node = va_list_type_node; | |
5848 | va_list_ref_type_node = build_reference_type (va_list_type_node); | |
5849 | } | |
5850 | ||
5851 | #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ | |
5852 | builtin_types[ENUM] = VALUE; | |
5853 | #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ | |
5854 | def_fn_type (ENUM, RETURN, 0, 0); | |
5855 | #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ | |
5856 | def_fn_type (ENUM, RETURN, 0, 1, ARG1); | |
5857 | #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ | |
5858 | def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2); | |
5859 | #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
5860 | def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3); | |
5861 | #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
5862 | def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4); | |
5863 | #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
5864 | def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
5865 | #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5866 | ARG6) \ | |
5867 | def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6); | |
5868 | #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5869 | ARG6, ARG7) \ | |
5870 | def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7); | |
5871 | #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ | |
5872 | def_fn_type (ENUM, RETURN, 1, 0); | |
5873 | #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ | |
5874 | def_fn_type (ENUM, RETURN, 1, 1, ARG1); | |
5875 | #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ | |
5876 | def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2); | |
5877 | #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
5878 | def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3); | |
5879 | #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
5880 | def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4); | |
5881 | #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
5882 | def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
5883 | #define DEF_POINTER_TYPE(ENUM, TYPE) \ | |
5884 | builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]); | |
5885 | ||
5886 | #include "builtin-types.def" | |
5887 | ||
5888 | #undef DEF_PRIMITIVE_TYPE | |
5889 | #undef DEF_FUNCTION_TYPE_1 | |
5890 | #undef DEF_FUNCTION_TYPE_2 | |
5891 | #undef DEF_FUNCTION_TYPE_3 | |
5892 | #undef DEF_FUNCTION_TYPE_4 | |
5893 | #undef DEF_FUNCTION_TYPE_5 | |
5894 | #undef DEF_FUNCTION_TYPE_6 | |
5895 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
5896 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
5897 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
5898 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
5899 | #undef DEF_FUNCTION_TYPE_VAR_4 | |
5900 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
5901 | #undef DEF_POINTER_TYPE | |
5902 | builtin_types[(int) BT_LAST] = NULL_TREE; | |
5903 | } | |
5904 | ||
5905 | /* ----------------------------------------------------------------------- * | |
5906 | * BUILTIN ATTRIBUTES * | |
5907 | * ----------------------------------------------------------------------- */ | |
5908 | ||
5909 | enum built_in_attribute | |
5910 | { | |
5911 | #define DEF_ATTR_NULL_TREE(ENUM) ENUM, | |
5912 | #define DEF_ATTR_INT(ENUM, VALUE) ENUM, | |
e384e6b5 | 5913 | #define DEF_ATTR_STRING(ENUM, VALUE) ENUM, |
a1ab4c31 AC |
5914 | #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, |
5915 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, | |
5916 | #include "builtin-attrs.def" | |
5917 | #undef DEF_ATTR_NULL_TREE | |
5918 | #undef DEF_ATTR_INT | |
e384e6b5 | 5919 | #undef DEF_ATTR_STRING |
a1ab4c31 AC |
5920 | #undef DEF_ATTR_IDENT |
5921 | #undef DEF_ATTR_TREE_LIST | |
5922 | ATTR_LAST | |
5923 | }; | |
5924 | ||
5925 | static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; | |
5926 | ||
5927 | static void | |
5928 | install_builtin_attributes (void) | |
5929 | { | |
5930 | /* Fill in the built_in_attributes array. */ | |
5931 | #define DEF_ATTR_NULL_TREE(ENUM) \ | |
5932 | built_in_attributes[(int) ENUM] = NULL_TREE; | |
5933 | #define DEF_ATTR_INT(ENUM, VALUE) \ | |
5934 | built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE); | |
e384e6b5 BS |
5935 | #define DEF_ATTR_STRING(ENUM, VALUE) \ |
5936 | built_in_attributes[(int) ENUM] = build_string (strlen (VALUE), VALUE); | |
a1ab4c31 AC |
5937 | #define DEF_ATTR_IDENT(ENUM, STRING) \ |
5938 | built_in_attributes[(int) ENUM] = get_identifier (STRING); | |
5939 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ | |
5940 | built_in_attributes[(int) ENUM] \ | |
5941 | = tree_cons (built_in_attributes[(int) PURPOSE], \ | |
5942 | built_in_attributes[(int) VALUE], \ | |
5943 | built_in_attributes[(int) CHAIN]); | |
5944 | #include "builtin-attrs.def" | |
5945 | #undef DEF_ATTR_NULL_TREE | |
5946 | #undef DEF_ATTR_INT | |
e384e6b5 | 5947 | #undef DEF_ATTR_STRING |
a1ab4c31 AC |
5948 | #undef DEF_ATTR_IDENT |
5949 | #undef DEF_ATTR_TREE_LIST | |
5950 | } | |
5951 | ||
5952 | /* Handle a "const" attribute; arguments as in | |
5953 | struct attribute_spec.handler. */ | |
5954 | ||
5955 | static tree | |
5956 | handle_const_attribute (tree *node, tree ARG_UNUSED (name), | |
5957 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5958 | bool *no_add_attrs) | |
5959 | { | |
5960 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5961 | TREE_READONLY (*node) = 1; | |
5962 | else | |
5963 | *no_add_attrs = true; | |
5964 | ||
5965 | return NULL_TREE; | |
5966 | } | |
5967 | ||
5968 | /* Handle a "nothrow" attribute; arguments as in | |
5969 | struct attribute_spec.handler. */ | |
5970 | ||
5971 | static tree | |
5972 | handle_nothrow_attribute (tree *node, tree ARG_UNUSED (name), | |
5973 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5974 | bool *no_add_attrs) | |
5975 | { | |
5976 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5977 | TREE_NOTHROW (*node) = 1; | |
5978 | else | |
5979 | *no_add_attrs = true; | |
5980 | ||
5981 | return NULL_TREE; | |
5982 | } | |
5983 | ||
5984 | /* Handle a "pure" attribute; arguments as in | |
5985 | struct attribute_spec.handler. */ | |
5986 | ||
5987 | static tree | |
5988 | handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5989 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5990 | { | |
5991 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5992 | DECL_PURE_P (*node) = 1; | |
5993 | /* ??? TODO: Support types. */ | |
5994 | else | |
5995 | { | |
7948ae37 OH |
5996 | warning (OPT_Wattributes, "%qs attribute ignored", |
5997 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
5998 | *no_add_attrs = true; |
5999 | } | |
6000 | ||
6001 | return NULL_TREE; | |
6002 | } | |
6003 | ||
6004 | /* Handle a "no vops" attribute; arguments as in | |
6005 | struct attribute_spec.handler. */ | |
6006 | ||
6007 | static tree | |
6008 | handle_novops_attribute (tree *node, tree ARG_UNUSED (name), | |
6009 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
6010 | bool *ARG_UNUSED (no_add_attrs)) | |
6011 | { | |
6012 | gcc_assert (TREE_CODE (*node) == FUNCTION_DECL); | |
6013 | DECL_IS_NOVOPS (*node) = 1; | |
6014 | return NULL_TREE; | |
6015 | } | |
6016 | ||
6017 | /* Helper for nonnull attribute handling; fetch the operand number | |
6018 | from the attribute argument list. */ | |
6019 | ||
6020 | static bool | |
6021 | get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) | |
6022 | { | |
6023 | /* Verify the arg number is a constant. */ | |
6024 | if (TREE_CODE (arg_num_expr) != INTEGER_CST | |
6025 | || TREE_INT_CST_HIGH (arg_num_expr) != 0) | |
6026 | return false; | |
6027 | ||
6028 | *valp = TREE_INT_CST_LOW (arg_num_expr); | |
6029 | return true; | |
6030 | } | |
6031 | ||
6032 | /* Handle the "nonnull" attribute. */ | |
6033 | static tree | |
6034 | handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name), | |
6035 | tree args, int ARG_UNUSED (flags), | |
6036 | bool *no_add_attrs) | |
6037 | { | |
6038 | tree type = *node; | |
6039 | unsigned HOST_WIDE_INT attr_arg_num; | |
6040 | ||
6041 | /* If no arguments are specified, all pointer arguments should be | |
6042 | non-null. Verify a full prototype is given so that the arguments | |
6043 | will have the correct types when we actually check them later. */ | |
6044 | if (!args) | |
6045 | { | |
f4da8dce | 6046 | if (!prototype_p (type)) |
a1ab4c31 AC |
6047 | { |
6048 | error ("nonnull attribute without arguments on a non-prototype"); | |
6049 | *no_add_attrs = true; | |
6050 | } | |
6051 | return NULL_TREE; | |
6052 | } | |
6053 | ||
6054 | /* Argument list specified. Verify that each argument number references | |
6055 | a pointer argument. */ | |
6056 | for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) | |
6057 | { | |
a1ab4c31 AC |
6058 | unsigned HOST_WIDE_INT arg_num = 0, ck_num; |
6059 | ||
6060 | if (!get_nonnull_operand (TREE_VALUE (args), &arg_num)) | |
6061 | { | |
6062 | error ("nonnull argument has invalid operand number (argument %lu)", | |
6063 | (unsigned long) attr_arg_num); | |
6064 | *no_add_attrs = true; | |
6065 | return NULL_TREE; | |
6066 | } | |
6067 | ||
d7d058c5 | 6068 | if (prototype_p (type)) |
a1ab4c31 | 6069 | { |
d7d058c5 NF |
6070 | function_args_iterator iter; |
6071 | tree argument; | |
6072 | ||
6073 | function_args_iter_init (&iter, type); | |
6074 | for (ck_num = 1; ; ck_num++, function_args_iter_next (&iter)) | |
a1ab4c31 | 6075 | { |
d7d058c5 | 6076 | argument = function_args_iter_cond (&iter); |
a1ab4c31 AC |
6077 | if (!argument || ck_num == arg_num) |
6078 | break; | |
a1ab4c31 AC |
6079 | } |
6080 | ||
6081 | if (!argument | |
d7d058c5 | 6082 | || TREE_CODE (argument) == VOID_TYPE) |
a1ab4c31 | 6083 | { |
58c8f770 EB |
6084 | error ("nonnull argument with out-of-range operand number " |
6085 | "(argument %lu, operand %lu)", | |
a1ab4c31 AC |
6086 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
6087 | *no_add_attrs = true; | |
6088 | return NULL_TREE; | |
6089 | } | |
6090 | ||
d7d058c5 | 6091 | if (TREE_CODE (argument) != POINTER_TYPE) |
a1ab4c31 | 6092 | { |
58c8f770 EB |
6093 | error ("nonnull argument references non-pointer operand " |
6094 | "(argument %lu, operand %lu)", | |
a1ab4c31 AC |
6095 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
6096 | *no_add_attrs = true; | |
6097 | return NULL_TREE; | |
6098 | } | |
6099 | } | |
6100 | } | |
6101 | ||
6102 | return NULL_TREE; | |
6103 | } | |
6104 | ||
6105 | /* Handle a "sentinel" attribute. */ | |
6106 | ||
6107 | static tree | |
6108 | handle_sentinel_attribute (tree *node, tree name, tree args, | |
6109 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6110 | { | |
f4da8dce | 6111 | if (!prototype_p (*node)) |
a1ab4c31 AC |
6112 | { |
6113 | warning (OPT_Wattributes, | |
7948ae37 OH |
6114 | "%qs attribute requires prototypes with named arguments", |
6115 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
6116 | *no_add_attrs = true; |
6117 | } | |
6118 | else | |
6119 | { | |
dcf0c47e | 6120 | if (!stdarg_p (*node)) |
a1ab4c31 AC |
6121 | { |
6122 | warning (OPT_Wattributes, | |
7948ae37 OH |
6123 | "%qs attribute only applies to variadic functions", |
6124 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
6125 | *no_add_attrs = true; |
6126 | } | |
6127 | } | |
6128 | ||
6129 | if (args) | |
6130 | { | |
6131 | tree position = TREE_VALUE (args); | |
6132 | ||
6133 | if (TREE_CODE (position) != INTEGER_CST) | |
6134 | { | |
6135 | warning (0, "requested position is not an integer constant"); | |
6136 | *no_add_attrs = true; | |
6137 | } | |
6138 | else | |
6139 | { | |
6140 | if (tree_int_cst_lt (position, integer_zero_node)) | |
6141 | { | |
6142 | warning (0, "requested position is less than zero"); | |
6143 | *no_add_attrs = true; | |
6144 | } | |
6145 | } | |
6146 | } | |
6147 | ||
6148 | return NULL_TREE; | |
6149 | } | |
6150 | ||
6151 | /* Handle a "noreturn" attribute; arguments as in | |
6152 | struct attribute_spec.handler. */ | |
6153 | ||
6154 | static tree | |
6155 | handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6156 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6157 | { | |
6158 | tree type = TREE_TYPE (*node); | |
6159 | ||
6160 | /* See FIXME comment in c_common_attribute_table. */ | |
6161 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
6162 | TREE_THIS_VOLATILE (*node) = 1; | |
6163 | else if (TREE_CODE (type) == POINTER_TYPE | |
6164 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
6165 | TREE_TYPE (*node) | |
6166 | = build_pointer_type | |
6167 | (build_type_variant (TREE_TYPE (type), | |
6168 | TYPE_READONLY (TREE_TYPE (type)), 1)); | |
6169 | else | |
6170 | { | |
7948ae37 OH |
6171 | warning (OPT_Wattributes, "%qs attribute ignored", |
6172 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
6173 | *no_add_attrs = true; |
6174 | } | |
6175 | ||
6176 | return NULL_TREE; | |
6177 | } | |
6178 | ||
0d6e14fd JH |
6179 | /* Handle a "leaf" attribute; arguments as in |
6180 | struct attribute_spec.handler. */ | |
6181 | ||
6182 | static tree | |
6183 | handle_leaf_attribute (tree *node, tree name, | |
6184 | tree ARG_UNUSED (args), | |
6185 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6186 | { | |
6187 | if (TREE_CODE (*node) != FUNCTION_DECL) | |
6188 | { | |
6189 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
6190 | *no_add_attrs = true; | |
6191 | } | |
6192 | if (!TREE_PUBLIC (*node)) | |
6193 | { | |
32a5388a | 6194 | warning (OPT_Wattributes, "%qE attribute has no effect", name); |
0d6e14fd JH |
6195 | *no_add_attrs = true; |
6196 | } | |
6197 | ||
6198 | return NULL_TREE; | |
6199 | } | |
6200 | ||
a1ab4c31 AC |
6201 | /* Handle a "malloc" attribute; arguments as in |
6202 | struct attribute_spec.handler. */ | |
6203 | ||
6204 | static tree | |
6205 | handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6206 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
6207 | { | |
6208 | if (TREE_CODE (*node) == FUNCTION_DECL | |
6209 | && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node)))) | |
6210 | DECL_IS_MALLOC (*node) = 1; | |
6211 | else | |
6212 | { | |
7948ae37 OH |
6213 | warning (OPT_Wattributes, "%qs attribute ignored", |
6214 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
6215 | *no_add_attrs = true; |
6216 | } | |
6217 | ||
6218 | return NULL_TREE; | |
6219 | } | |
6220 | ||
6221 | /* Fake handler for attributes we don't properly support. */ | |
6222 | ||
6223 | tree | |
6224 | fake_attribute_handler (tree * ARG_UNUSED (node), | |
6225 | tree ARG_UNUSED (name), | |
6226 | tree ARG_UNUSED (args), | |
6227 | int ARG_UNUSED (flags), | |
6228 | bool * ARG_UNUSED (no_add_attrs)) | |
6229 | { | |
6230 | return NULL_TREE; | |
6231 | } | |
6232 | ||
6233 | /* Handle a "type_generic" attribute. */ | |
6234 | ||
6235 | static tree | |
6236 | handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name), | |
6237 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
6238 | bool * ARG_UNUSED (no_add_attrs)) | |
6239 | { | |
a1ab4c31 AC |
6240 | /* Ensure we have a function type. */ |
6241 | gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE); | |
b4680ca1 | 6242 | |
a1ab4c31 | 6243 | /* Ensure we have a variadic function. */ |
dcf0c47e | 6244 | gcc_assert (!prototype_p (*node) || stdarg_p (*node)); |
a1ab4c31 AC |
6245 | |
6246 | return NULL_TREE; | |
6247 | } | |
6248 | ||
2724e58f OH |
6249 | /* Handle a "vector_size" attribute; arguments as in |
6250 | struct attribute_spec.handler. */ | |
6251 | ||
6252 | static tree | |
6253 | handle_vector_size_attribute (tree *node, tree name, tree args, | |
6254 | int ARG_UNUSED (flags), | |
6255 | bool *no_add_attrs) | |
6256 | { | |
6257 | unsigned HOST_WIDE_INT vecsize, nunits; | |
6258 | enum machine_mode orig_mode; | |
6259 | tree type = *node, new_type, size; | |
6260 | ||
6261 | *no_add_attrs = true; | |
6262 | ||
6263 | size = TREE_VALUE (args); | |
6264 | ||
6265 | if (!host_integerp (size, 1)) | |
6266 | { | |
7948ae37 OH |
6267 | warning (OPT_Wattributes, "%qs attribute ignored", |
6268 | IDENTIFIER_POINTER (name)); | |
2724e58f OH |
6269 | return NULL_TREE; |
6270 | } | |
6271 | ||
6272 | /* Get the vector size (in bytes). */ | |
6273 | vecsize = tree_low_cst (size, 1); | |
6274 | ||
6275 | /* We need to provide for vector pointers, vector arrays, and | |
6276 | functions returning vectors. For example: | |
6277 | ||
6278 | __attribute__((vector_size(16))) short *foo; | |
6279 | ||
6280 | In this case, the mode is SI, but the type being modified is | |
6281 | HI, so we need to look further. */ | |
6282 | ||
6283 | while (POINTER_TYPE_P (type) | |
6284 | || TREE_CODE (type) == FUNCTION_TYPE | |
132a5459 | 6285 | || TREE_CODE (type) == ARRAY_TYPE) |
2724e58f OH |
6286 | type = TREE_TYPE (type); |
6287 | ||
6288 | /* Get the mode of the type being modified. */ | |
6289 | orig_mode = TYPE_MODE (type); | |
6290 | ||
6291 | if ((!INTEGRAL_TYPE_P (type) | |
6292 | && !SCALAR_FLOAT_TYPE_P (type) | |
6293 | && !FIXED_POINT_TYPE_P (type)) | |
6294 | || (!SCALAR_FLOAT_MODE_P (orig_mode) | |
6295 | && GET_MODE_CLASS (orig_mode) != MODE_INT | |
6296 | && !ALL_SCALAR_FIXED_POINT_MODE_P (orig_mode)) | |
6297 | || !host_integerp (TYPE_SIZE_UNIT (type), 1) | |
6298 | || TREE_CODE (type) == BOOLEAN_TYPE) | |
6299 | { | |
7948ae37 OH |
6300 | error ("invalid vector type for attribute %qs", |
6301 | IDENTIFIER_POINTER (name)); | |
2724e58f OH |
6302 | return NULL_TREE; |
6303 | } | |
6304 | ||
6305 | if (vecsize % tree_low_cst (TYPE_SIZE_UNIT (type), 1)) | |
6306 | { | |
6307 | error ("vector size not an integral multiple of component size"); | |
6308 | return NULL; | |
6309 | } | |
6310 | ||
6311 | if (vecsize == 0) | |
6312 | { | |
6313 | error ("zero vector size"); | |
6314 | return NULL; | |
6315 | } | |
6316 | ||
6317 | /* Calculate how many units fit in the vector. */ | |
6318 | nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
6319 | if (nunits & (nunits - 1)) | |
6320 | { | |
6321 | error ("number of components of the vector not a power of two"); | |
6322 | return NULL_TREE; | |
6323 | } | |
6324 | ||
6325 | new_type = build_vector_type (type, nunits); | |
6326 | ||
6327 | /* Build back pointers if needed. */ | |
9b469089 | 6328 | *node = reconstruct_complex_type (*node, new_type); |
2724e58f OH |
6329 | |
6330 | return NULL_TREE; | |
6331 | } | |
6332 | ||
7948ae37 OH |
6333 | /* Handle a "vector_type" attribute; arguments as in |
6334 | struct attribute_spec.handler. */ | |
6335 | ||
6336 | static tree | |
6337 | handle_vector_type_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
6338 | int ARG_UNUSED (flags), | |
6339 | bool *no_add_attrs) | |
6340 | { | |
6341 | /* Vector representative type and size. */ | |
6342 | tree rep_type = *node; | |
6343 | tree rep_size = TYPE_SIZE_UNIT (rep_type); | |
6344 | tree rep_name; | |
6345 | ||
6346 | /* Vector size in bytes and number of units. */ | |
6347 | unsigned HOST_WIDE_INT vec_bytes, vec_units; | |
6348 | ||
6349 | /* Vector element type and mode. */ | |
6350 | tree elem_type; | |
6351 | enum machine_mode elem_mode; | |
6352 | ||
6353 | *no_add_attrs = true; | |
6354 | ||
6355 | /* Get the representative array type, possibly nested within a | |
6356 | padding record e.g. for alignment purposes. */ | |
6357 | ||
315cff15 | 6358 | if (TYPE_IS_PADDING_P (rep_type)) |
7948ae37 OH |
6359 | rep_type = TREE_TYPE (TYPE_FIELDS (rep_type)); |
6360 | ||
6361 | if (TREE_CODE (rep_type) != ARRAY_TYPE) | |
6362 | { | |
6363 | error ("attribute %qs applies to array types only", | |
6364 | IDENTIFIER_POINTER (name)); | |
6365 | return NULL_TREE; | |
6366 | } | |
6367 | ||
6368 | /* Silently punt on variable sizes. We can't make vector types for them, | |
6369 | need to ignore them on front-end generated subtypes of unconstrained | |
6370 | bases, and this attribute is for binding implementors, not end-users, so | |
6371 | we should never get there from legitimate explicit uses. */ | |
6372 | ||
6373 | if (!host_integerp (rep_size, 1)) | |
6374 | return NULL_TREE; | |
6375 | ||
6376 | /* Get the element type/mode and check this is something we know | |
6377 | how to make vectors of. */ | |
6378 | ||
6379 | elem_type = TREE_TYPE (rep_type); | |
6380 | elem_mode = TYPE_MODE (elem_type); | |
6381 | ||
6382 | if ((!INTEGRAL_TYPE_P (elem_type) | |
6383 | && !SCALAR_FLOAT_TYPE_P (elem_type) | |
6384 | && !FIXED_POINT_TYPE_P (elem_type)) | |
6385 | || (!SCALAR_FLOAT_MODE_P (elem_mode) | |
6386 | && GET_MODE_CLASS (elem_mode) != MODE_INT | |
6387 | && !ALL_SCALAR_FIXED_POINT_MODE_P (elem_mode)) | |
6388 | || !host_integerp (TYPE_SIZE_UNIT (elem_type), 1)) | |
6389 | { | |
6390 | error ("invalid element type for attribute %qs", | |
6391 | IDENTIFIER_POINTER (name)); | |
6392 | return NULL_TREE; | |
6393 | } | |
6394 | ||
6395 | /* Sanity check the vector size and element type consistency. */ | |
6396 | ||
6397 | vec_bytes = tree_low_cst (rep_size, 1); | |
6398 | ||
6399 | if (vec_bytes % tree_low_cst (TYPE_SIZE_UNIT (elem_type), 1)) | |
6400 | { | |
6401 | error ("vector size not an integral multiple of component size"); | |
6402 | return NULL; | |
6403 | } | |
6404 | ||
6405 | if (vec_bytes == 0) | |
6406 | { | |
6407 | error ("zero vector size"); | |
6408 | return NULL; | |
6409 | } | |
6410 | ||
6411 | vec_units = vec_bytes / tree_low_cst (TYPE_SIZE_UNIT (elem_type), 1); | |
6412 | if (vec_units & (vec_units - 1)) | |
6413 | { | |
6414 | error ("number of components of the vector not a power of two"); | |
6415 | return NULL_TREE; | |
6416 | } | |
6417 | ||
6418 | /* Build the vector type and replace. */ | |
6419 | ||
6420 | *node = build_vector_type (elem_type, vec_units); | |
6421 | rep_name = TYPE_NAME (rep_type); | |
6422 | if (TREE_CODE (rep_name) == TYPE_DECL) | |
6423 | rep_name = DECL_NAME (rep_name); | |
6424 | TYPE_NAME (*node) = rep_name; | |
6425 | TYPE_REPRESENTATIVE_ARRAY (*node) = rep_type; | |
6426 | ||
6427 | return NULL_TREE; | |
6428 | } | |
6429 | ||
a1ab4c31 AC |
6430 | /* ----------------------------------------------------------------------- * |
6431 | * BUILTIN FUNCTIONS * | |
6432 | * ----------------------------------------------------------------------- */ | |
6433 | ||
6434 | /* Worker for DEF_BUILTIN. Possibly define a builtin function with one or two | |
6435 | names. Does not declare a non-__builtin_ function if flag_no_builtin, or | |
6436 | if nonansi_p and flag_no_nonansi_builtin. */ | |
6437 | ||
6438 | static void | |
6439 | def_builtin_1 (enum built_in_function fncode, | |
6440 | const char *name, | |
6441 | enum built_in_class fnclass, | |
6442 | tree fntype, tree libtype, | |
6443 | bool both_p, bool fallback_p, | |
6444 | bool nonansi_p ATTRIBUTE_UNUSED, | |
6445 | tree fnattrs, bool implicit_p) | |
6446 | { | |
6447 | tree decl; | |
6448 | const char *libname; | |
6449 | ||
6450 | /* Preserve an already installed decl. It most likely was setup in advance | |
6451 | (e.g. as part of the internal builtins) for specific reasons. */ | |
e79983f4 | 6452 | if (builtin_decl_explicit (fncode) != NULL_TREE) |
a1ab4c31 AC |
6453 | return; |
6454 | ||
6455 | gcc_assert ((!both_p && !fallback_p) | |
6456 | || !strncmp (name, "__builtin_", | |
6457 | strlen ("__builtin_"))); | |
6458 | ||
6459 | libname = name + strlen ("__builtin_"); | |
6460 | decl = add_builtin_function (name, fntype, fncode, fnclass, | |
6461 | (fallback_p ? libname : NULL), | |
6462 | fnattrs); | |
6463 | if (both_p) | |
6464 | /* ??? This is normally further controlled by command-line options | |
6465 | like -fno-builtin, but we don't have them for Ada. */ | |
6466 | add_builtin_function (libname, libtype, fncode, fnclass, | |
6467 | NULL, fnattrs); | |
6468 | ||
e79983f4 | 6469 | set_builtin_decl (fncode, decl, implicit_p); |
a1ab4c31 AC |
6470 | } |
6471 | ||
6472 | static int flag_isoc94 = 0; | |
6473 | static int flag_isoc99 = 0; | |
6474 | ||
6475 | /* Install what the common builtins.def offers. */ | |
6476 | ||
6477 | static void | |
6478 | install_builtin_functions (void) | |
6479 | { | |
6480 | #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \ | |
6481 | NONANSI_P, ATTRS, IMPLICIT, COND) \ | |
6482 | if (NAME && COND) \ | |
6483 | def_builtin_1 (ENUM, NAME, CLASS, \ | |
6484 | builtin_types[(int) TYPE], \ | |
6485 | builtin_types[(int) LIBTYPE], \ | |
6486 | BOTH_P, FALLBACK_P, NONANSI_P, \ | |
6487 | built_in_attributes[(int) ATTRS], IMPLICIT); | |
6488 | #include "builtins.def" | |
6489 | #undef DEF_BUILTIN | |
6490 | } | |
6491 | ||
6492 | /* ----------------------------------------------------------------------- * | |
6493 | * BUILTIN FUNCTIONS * | |
6494 | * ----------------------------------------------------------------------- */ | |
6495 | ||
6496 | /* Install the builtin functions we might need. */ | |
6497 | ||
6498 | void | |
6499 | gnat_install_builtins (void) | |
6500 | { | |
6501 | install_builtin_elementary_types (); | |
6502 | install_builtin_function_types (); | |
6503 | install_builtin_attributes (); | |
6504 | ||
6505 | /* Install builtins used by generic middle-end pieces first. Some of these | |
6506 | know about internal specificities and control attributes accordingly, for | |
6507 | instance __builtin_alloca vs no-throw and -fstack-check. We will ignore | |
6508 | the generic definition from builtins.def. */ | |
384c400a | 6509 | build_common_builtin_nodes (); |
a1ab4c31 AC |
6510 | |
6511 | /* Now, install the target specific builtins, such as the AltiVec family on | |
6512 | ppc, and the common set as exposed by builtins.def. */ | |
6513 | targetm.init_builtins (); | |
6514 | install_builtin_functions (); | |
6515 | } | |
6516 | ||
6517 | #include "gt-ada-utils.h" | |
6518 | #include "gtype-ada.h" |