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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 | * * | |
31a5a547 | 9 | * Copyright (C) 1992-2011, 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" | |
8713b7e4 | 39 | #include "langhooks.h" |
a1ab4c31 | 40 | #include "cgraph.h" |
8713b7e4 | 41 | #include "tree-dump.h" |
a1ab4c31 AC |
42 | #include "tree-inline.h" |
43 | #include "tree-iterator.h" | |
a1ab4c31 AC |
44 | |
45 | #include "ada.h" | |
46 | #include "types.h" | |
47 | #include "atree.h" | |
48 | #include "elists.h" | |
49 | #include "namet.h" | |
50 | #include "nlists.h" | |
51 | #include "stringt.h" | |
52 | #include "uintp.h" | |
53 | #include "fe.h" | |
54 | #include "sinfo.h" | |
55 | #include "einfo.h" | |
56 | #include "ada-tree.h" | |
57 | #include "gigi.h" | |
58 | ||
a1ab4c31 AC |
59 | #ifndef MAX_BITS_PER_WORD |
60 | #define MAX_BITS_PER_WORD BITS_PER_WORD | |
61 | #endif | |
62 | ||
63 | /* If nonzero, pretend we are allocating at global level. */ | |
64 | int force_global; | |
65 | ||
caa9d12a EB |
66 | /* The default alignment of "double" floating-point types, i.e. floating |
67 | point types whose size is equal to 64 bits, or 0 if this alignment is | |
68 | not specifically capped. */ | |
69 | int double_float_alignment; | |
70 | ||
71 | /* The default alignment of "double" or larger scalar types, i.e. scalar | |
72 | types whose size is greater or equal to 64 bits, or 0 if this alignment | |
73 | is not specifically capped. */ | |
74 | int double_scalar_alignment; | |
75 | ||
a1ab4c31 AC |
76 | /* Tree nodes for the various types and decls we create. */ |
77 | tree gnat_std_decls[(int) ADT_LAST]; | |
78 | ||
79 | /* Functions to call for each of the possible raise reasons. */ | |
80 | tree gnat_raise_decls[(int) LAST_REASON_CODE + 1]; | |
81 | ||
ca8e13e8 | 82 | /* Likewise, but with extra info for each of the possible raise reasons. */ |
437f8c1e AC |
83 | tree gnat_raise_decls_ext[(int) LAST_REASON_CODE + 1]; |
84 | ||
a1ab4c31 AC |
85 | /* Forward declarations for handlers of attributes. */ |
86 | static tree handle_const_attribute (tree *, tree, tree, int, bool *); | |
87 | static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); | |
88 | static tree handle_pure_attribute (tree *, tree, tree, int, bool *); | |
89 | static tree handle_novops_attribute (tree *, tree, tree, int, bool *); | |
90 | static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); | |
91 | static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *); | |
92 | static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); | |
0d6e14fd | 93 | static tree handle_leaf_attribute (tree *, tree, tree, int, bool *); |
a1ab4c31 AC |
94 | static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); |
95 | static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *); | |
2724e58f | 96 | static tree handle_vector_size_attribute (tree *, tree, tree, int, bool *); |
7948ae37 | 97 | static tree handle_vector_type_attribute (tree *, tree, tree, int, bool *); |
a1ab4c31 AC |
98 | |
99 | /* Fake handler for attributes we don't properly support, typically because | |
100 | they'd require dragging a lot of the common-c front-end circuitry. */ | |
101 | static tree fake_attribute_handler (tree *, tree, tree, int, bool *); | |
102 | ||
103 | /* Table of machine-independent internal attributes for Ada. We support | |
104 | this minimal set of attributes to accommodate the needs of builtins. */ | |
105 | const struct attribute_spec gnat_internal_attribute_table[] = | |
106 | { | |
62d784f7 KT |
107 | /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler, |
108 | affects_type_identity } */ | |
109 | { "const", 0, 0, true, false, false, handle_const_attribute, | |
110 | false }, | |
111 | { "nothrow", 0, 0, true, false, false, handle_nothrow_attribute, | |
112 | false }, | |
113 | { "pure", 0, 0, true, false, false, handle_pure_attribute, | |
114 | false }, | |
115 | { "no vops", 0, 0, true, false, false, handle_novops_attribute, | |
116 | false }, | |
117 | { "nonnull", 0, -1, false, true, true, handle_nonnull_attribute, | |
118 | false }, | |
119 | { "sentinel", 0, 1, false, true, true, handle_sentinel_attribute, | |
120 | false }, | |
121 | { "noreturn", 0, 0, true, false, false, handle_noreturn_attribute, | |
122 | false }, | |
123 | { "leaf", 0, 0, true, false, false, handle_leaf_attribute, | |
124 | false }, | |
125 | { "malloc", 0, 0, true, false, false, handle_malloc_attribute, | |
126 | false }, | |
127 | { "type generic", 0, 0, false, true, true, handle_type_generic_attribute, | |
128 | false }, | |
129 | ||
130 | { "vector_size", 1, 1, false, true, false, handle_vector_size_attribute, | |
131 | false }, | |
132 | { "vector_type", 0, 0, false, true, false, handle_vector_type_attribute, | |
133 | false }, | |
134 | { "may_alias", 0, 0, false, true, false, NULL, false }, | |
a1ab4c31 AC |
135 | |
136 | /* ??? format and format_arg are heavy and not supported, which actually | |
137 | prevents support for stdio builtins, which we however declare as part | |
138 | of the common builtins.def contents. */ | |
62d784f7 KT |
139 | { "format", 3, 3, false, true, true, fake_attribute_handler, false }, |
140 | { "format_arg", 1, 1, false, true, true, fake_attribute_handler, false }, | |
a1ab4c31 | 141 | |
62d784f7 | 142 | { NULL, 0, 0, false, false, false, NULL, false } |
a1ab4c31 AC |
143 | }; |
144 | ||
145 | /* Associates a GNAT tree node to a GCC tree node. It is used in | |
146 | `save_gnu_tree', `get_gnu_tree' and `present_gnu_tree'. See documentation | |
147 | of `save_gnu_tree' for more info. */ | |
148 | static GTY((length ("max_gnat_nodes"))) tree *associate_gnat_to_gnu; | |
149 | ||
150 | #define GET_GNU_TREE(GNAT_ENTITY) \ | |
151 | associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] | |
152 | ||
153 | #define SET_GNU_TREE(GNAT_ENTITY,VAL) \ | |
154 | associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] = (VAL) | |
155 | ||
156 | #define PRESENT_GNU_TREE(GNAT_ENTITY) \ | |
157 | (associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE) | |
158 | ||
159 | /* Associates a GNAT entity to a GCC tree node used as a dummy, if any. */ | |
160 | static GTY((length ("max_gnat_nodes"))) tree *dummy_node_table; | |
161 | ||
162 | #define GET_DUMMY_NODE(GNAT_ENTITY) \ | |
163 | dummy_node_table[(GNAT_ENTITY) - First_Node_Id] | |
164 | ||
165 | #define SET_DUMMY_NODE(GNAT_ENTITY,VAL) \ | |
166 | dummy_node_table[(GNAT_ENTITY) - First_Node_Id] = (VAL) | |
167 | ||
168 | #define PRESENT_DUMMY_NODE(GNAT_ENTITY) \ | |
169 | (dummy_node_table[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE) | |
170 | ||
171 | /* This variable keeps a table for types for each precision so that we only | |
172 | allocate each of them once. Signed and unsigned types are kept separate. | |
173 | ||
174 | Note that these types are only used when fold-const requests something | |
175 | special. Perhaps we should NOT share these types; we'll see how it | |
176 | goes later. */ | |
177 | static GTY(()) tree signed_and_unsigned_types[2 * MAX_BITS_PER_WORD + 1][2]; | |
178 | ||
179 | /* Likewise for float types, but record these by mode. */ | |
180 | static GTY(()) tree float_types[NUM_MACHINE_MODES]; | |
181 | ||
182 | /* For each binding contour we allocate a binding_level structure to indicate | |
183 | the binding depth. */ | |
184 | ||
d1b38208 | 185 | struct GTY((chain_next ("%h.chain"))) gnat_binding_level { |
a1ab4c31 AC |
186 | /* The binding level containing this one (the enclosing binding level). */ |
187 | struct gnat_binding_level *chain; | |
188 | /* The BLOCK node for this level. */ | |
189 | tree block; | |
190 | /* If nonzero, the setjmp buffer that needs to be updated for any | |
191 | variable-sized definition within this context. */ | |
192 | tree jmpbuf_decl; | |
193 | }; | |
194 | ||
195 | /* The binding level currently in effect. */ | |
196 | static GTY(()) struct gnat_binding_level *current_binding_level; | |
197 | ||
198 | /* A chain of gnat_binding_level structures awaiting reuse. */ | |
199 | static GTY((deletable)) struct gnat_binding_level *free_binding_level; | |
200 | ||
201 | /* An array of global declarations. */ | |
202 | static GTY(()) VEC(tree,gc) *global_decls; | |
203 | ||
204 | /* An array of builtin function declarations. */ | |
205 | static GTY(()) VEC(tree,gc) *builtin_decls; | |
206 | ||
207 | /* An array of global renaming pointers. */ | |
208 | static GTY(()) VEC(tree,gc) *global_renaming_pointers; | |
209 | ||
210 | /* A chain of unused BLOCK nodes. */ | |
211 | static GTY((deletable)) tree free_block_chain; | |
212 | ||
a1ab4c31 AC |
213 | static tree merge_sizes (tree, tree, tree, bool, bool); |
214 | static tree compute_related_constant (tree, tree); | |
215 | static tree split_plus (tree, tree *); | |
a1ab4c31 AC |
216 | static tree float_type_for_precision (int, enum machine_mode); |
217 | static tree convert_to_fat_pointer (tree, tree); | |
218 | static tree convert_to_thin_pointer (tree, tree); | |
a1ab4c31 | 219 | static bool potential_alignment_gap (tree, tree, tree); |
58c8f770 | 220 | static void process_attributes (tree, struct attrib *); |
a1ab4c31 AC |
221 | \f |
222 | /* Initialize the association of GNAT nodes to GCC trees. */ | |
223 | ||
224 | void | |
225 | init_gnat_to_gnu (void) | |
226 | { | |
a9429e29 | 227 | associate_gnat_to_gnu = ggc_alloc_cleared_vec_tree (max_gnat_nodes); |
a1ab4c31 AC |
228 | } |
229 | ||
a1d8cc63 EB |
230 | /* GNAT_ENTITY is a GNAT tree node for an entity. Associate GNU_DECL, a GCC |
231 | tree node, with GNAT_ENTITY. If GNU_DECL is not a ..._DECL node, abort. | |
232 | If NO_CHECK is true, the latter check is suppressed. | |
a1ab4c31 | 233 | |
a1d8cc63 | 234 | If GNU_DECL is zero, reset a previous association. */ |
a1ab4c31 AC |
235 | |
236 | void | |
237 | save_gnu_tree (Entity_Id gnat_entity, tree gnu_decl, bool no_check) | |
238 | { | |
239 | /* Check that GNAT_ENTITY is not already defined and that it is being set | |
a1d8cc63 | 240 | to something which is a decl. If that is not the case, this usually |
a1ab4c31 AC |
241 | means GNAT_ENTITY is defined twice, but occasionally is due to some |
242 | Gigi problem. */ | |
243 | gcc_assert (!(gnu_decl | |
244 | && (PRESENT_GNU_TREE (gnat_entity) | |
245 | || (!no_check && !DECL_P (gnu_decl))))); | |
246 | ||
247 | SET_GNU_TREE (gnat_entity, gnu_decl); | |
248 | } | |
249 | ||
a1d8cc63 EB |
250 | /* GNAT_ENTITY is a GNAT tree node for an entity. Return the GCC tree node |
251 | that was associated with it. If there is no such tree node, abort. | |
a1ab4c31 AC |
252 | |
253 | In some cases, such as delayed elaboration or expressions that need to | |
254 | be elaborated only once, GNAT_ENTITY is really not an entity. */ | |
255 | ||
256 | tree | |
257 | get_gnu_tree (Entity_Id gnat_entity) | |
258 | { | |
259 | gcc_assert (PRESENT_GNU_TREE (gnat_entity)); | |
260 | return GET_GNU_TREE (gnat_entity); | |
261 | } | |
262 | ||
263 | /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */ | |
264 | ||
265 | bool | |
266 | present_gnu_tree (Entity_Id gnat_entity) | |
267 | { | |
268 | return PRESENT_GNU_TREE (gnat_entity); | |
269 | } | |
270 | \f | |
271 | /* Initialize the association of GNAT nodes to GCC trees as dummies. */ | |
272 | ||
273 | void | |
274 | init_dummy_type (void) | |
275 | { | |
a9429e29 | 276 | dummy_node_table = ggc_alloc_cleared_vec_tree (max_gnat_nodes); |
a1ab4c31 AC |
277 | } |
278 | ||
279 | /* Make a dummy type corresponding to GNAT_TYPE. */ | |
280 | ||
281 | tree | |
282 | make_dummy_type (Entity_Id gnat_type) | |
283 | { | |
284 | Entity_Id gnat_underlying = Gigi_Equivalent_Type (gnat_type); | |
285 | tree gnu_type; | |
286 | ||
287 | /* If there is an equivalent type, get its underlying type. */ | |
288 | if (Present (gnat_underlying)) | |
289 | gnat_underlying = Underlying_Type (gnat_underlying); | |
290 | ||
291 | /* If there was no equivalent type (can only happen when just annotating | |
292 | types) or underlying type, go back to the original type. */ | |
293 | if (No (gnat_underlying)) | |
294 | gnat_underlying = gnat_type; | |
295 | ||
296 | /* If it there already a dummy type, use that one. Else make one. */ | |
297 | if (PRESENT_DUMMY_NODE (gnat_underlying)) | |
298 | return GET_DUMMY_NODE (gnat_underlying); | |
299 | ||
300 | /* If this is a record, make a RECORD_TYPE or UNION_TYPE; else make | |
301 | an ENUMERAL_TYPE. */ | |
302 | gnu_type = make_node (Is_Record_Type (gnat_underlying) | |
303 | ? tree_code_for_record_type (gnat_underlying) | |
304 | : ENUMERAL_TYPE); | |
305 | TYPE_NAME (gnu_type) = get_entity_name (gnat_type); | |
306 | TYPE_DUMMY_P (gnu_type) = 1; | |
10069d53 EB |
307 | TYPE_STUB_DECL (gnu_type) |
308 | = create_type_stub_decl (TYPE_NAME (gnu_type), gnu_type); | |
cb3d597d EB |
309 | if (Is_By_Reference_Type (gnat_type)) |
310 | TREE_ADDRESSABLE (gnu_type) = 1; | |
a1ab4c31 AC |
311 | |
312 | SET_DUMMY_NODE (gnat_underlying, gnu_type); | |
313 | ||
314 | return gnu_type; | |
315 | } | |
e3edbd56 EB |
316 | |
317 | /* Return the dummy type that was made for GNAT_TYPE, if any. */ | |
318 | ||
319 | tree | |
320 | get_dummy_type (Entity_Id gnat_type) | |
321 | { | |
322 | return GET_DUMMY_NODE (gnat_type); | |
323 | } | |
324 | ||
325 | /* Build dummy fat and thin pointer types whose designated type is specified | |
326 | by GNAT_DESIG_TYPE/GNU_DESIG_TYPE and attach them to the latter. */ | |
327 | ||
328 | void | |
329 | build_dummy_unc_pointer_types (Entity_Id gnat_desig_type, tree gnu_desig_type) | |
330 | { | |
331 | tree gnu_template_type, gnu_ptr_template, gnu_array_type, gnu_ptr_array; | |
332 | tree gnu_fat_type, fields, gnu_object_type; | |
333 | ||
334 | gnu_template_type = make_node (RECORD_TYPE); | |
335 | TYPE_NAME (gnu_template_type) = create_concat_name (gnat_desig_type, "XUB"); | |
336 | TYPE_DUMMY_P (gnu_template_type) = 1; | |
337 | gnu_ptr_template = build_pointer_type (gnu_template_type); | |
338 | ||
339 | gnu_array_type = make_node (ENUMERAL_TYPE); | |
340 | TYPE_NAME (gnu_array_type) = create_concat_name (gnat_desig_type, "XUA"); | |
341 | TYPE_DUMMY_P (gnu_array_type) = 1; | |
342 | gnu_ptr_array = build_pointer_type (gnu_array_type); | |
343 | ||
344 | gnu_fat_type = make_node (RECORD_TYPE); | |
345 | /* Build a stub DECL to trigger the special processing for fat pointer types | |
346 | in gnat_pushdecl. */ | |
347 | TYPE_NAME (gnu_fat_type) | |
348 | = create_type_stub_decl (create_concat_name (gnat_desig_type, "XUP"), | |
349 | gnu_fat_type); | |
350 | fields = create_field_decl (get_identifier ("P_ARRAY"), gnu_ptr_array, | |
351 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
352 | DECL_CHAIN (fields) | |
353 | = create_field_decl (get_identifier ("P_BOUNDS"), gnu_ptr_template, | |
354 | gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); | |
355 | finish_fat_pointer_type (gnu_fat_type, fields); | |
356 | SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_desig_type); | |
357 | /* Suppress debug info until after the type is completed. */ | |
358 | TYPE_DECL_SUPPRESS_DEBUG (TYPE_STUB_DECL (gnu_fat_type)) = 1; | |
359 | ||
360 | gnu_object_type = make_node (RECORD_TYPE); | |
361 | TYPE_NAME (gnu_object_type) = create_concat_name (gnat_desig_type, "XUT"); | |
362 | TYPE_DUMMY_P (gnu_object_type) = 1; | |
363 | ||
364 | TYPE_POINTER_TO (gnu_desig_type) = gnu_fat_type; | |
365 | TYPE_OBJECT_RECORD_TYPE (gnu_desig_type) = gnu_object_type; | |
366 | } | |
a1ab4c31 | 367 | \f |
c99c0026 | 368 | /* Return true if we are in the global binding level. */ |
a1ab4c31 | 369 | |
c99c0026 | 370 | bool |
a1ab4c31 AC |
371 | global_bindings_p (void) |
372 | { | |
c99c0026 | 373 | return force_global || current_function_decl == NULL_TREE; |
a1ab4c31 AC |
374 | } |
375 | ||
a09d56d8 | 376 | /* Enter a new binding level. */ |
a1ab4c31 AC |
377 | |
378 | void | |
c6bd4220 | 379 | gnat_pushlevel (void) |
a1ab4c31 AC |
380 | { |
381 | struct gnat_binding_level *newlevel = NULL; | |
382 | ||
383 | /* Reuse a struct for this binding level, if there is one. */ | |
384 | if (free_binding_level) | |
385 | { | |
386 | newlevel = free_binding_level; | |
387 | free_binding_level = free_binding_level->chain; | |
388 | } | |
389 | else | |
a9429e29 | 390 | newlevel = ggc_alloc_gnat_binding_level (); |
a1ab4c31 AC |
391 | |
392 | /* Use a free BLOCK, if any; otherwise, allocate one. */ | |
393 | if (free_block_chain) | |
394 | { | |
395 | newlevel->block = free_block_chain; | |
396 | free_block_chain = BLOCK_CHAIN (free_block_chain); | |
397 | BLOCK_CHAIN (newlevel->block) = NULL_TREE; | |
398 | } | |
399 | else | |
400 | newlevel->block = make_node (BLOCK); | |
401 | ||
402 | /* Point the BLOCK we just made to its parent. */ | |
403 | if (current_binding_level) | |
404 | BLOCK_SUPERCONTEXT (newlevel->block) = current_binding_level->block; | |
405 | ||
a09d56d8 EB |
406 | BLOCK_VARS (newlevel->block) = NULL_TREE; |
407 | BLOCK_SUBBLOCKS (newlevel->block) = NULL_TREE; | |
a1ab4c31 AC |
408 | TREE_USED (newlevel->block) = 1; |
409 | ||
a09d56d8 | 410 | /* Add this level to the front of the chain (stack) of active levels. */ |
a1ab4c31 AC |
411 | newlevel->chain = current_binding_level; |
412 | newlevel->jmpbuf_decl = NULL_TREE; | |
413 | current_binding_level = newlevel; | |
414 | } | |
415 | ||
416 | /* Set SUPERCONTEXT of the BLOCK for the current binding level to FNDECL | |
417 | and point FNDECL to this BLOCK. */ | |
418 | ||
419 | void | |
420 | set_current_block_context (tree fndecl) | |
421 | { | |
422 | BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl; | |
423 | DECL_INITIAL (fndecl) = current_binding_level->block; | |
a09d56d8 | 424 | set_block_for_group (current_binding_level->block); |
a1ab4c31 AC |
425 | } |
426 | ||
427 | /* Set the jmpbuf_decl for the current binding level to DECL. */ | |
428 | ||
429 | void | |
430 | set_block_jmpbuf_decl (tree decl) | |
431 | { | |
432 | current_binding_level->jmpbuf_decl = decl; | |
433 | } | |
434 | ||
435 | /* Get the jmpbuf_decl, if any, for the current binding level. */ | |
436 | ||
437 | tree | |
c6bd4220 | 438 | get_block_jmpbuf_decl (void) |
a1ab4c31 AC |
439 | { |
440 | return current_binding_level->jmpbuf_decl; | |
441 | } | |
442 | ||
a09d56d8 | 443 | /* Exit a binding level. Set any BLOCK into the current code group. */ |
a1ab4c31 AC |
444 | |
445 | void | |
c6bd4220 | 446 | gnat_poplevel (void) |
a1ab4c31 AC |
447 | { |
448 | struct gnat_binding_level *level = current_binding_level; | |
449 | tree block = level->block; | |
450 | ||
451 | BLOCK_VARS (block) = nreverse (BLOCK_VARS (block)); | |
72ac05b0 | 452 | BLOCK_SUBBLOCKS (block) = blocks_nreverse (BLOCK_SUBBLOCKS (block)); |
a1ab4c31 AC |
453 | |
454 | /* If this is a function-level BLOCK don't do anything. Otherwise, if there | |
455 | are no variables free the block and merge its subblocks into those of its | |
a09d56d8 | 456 | parent block. Otherwise, add it to the list of its parent. */ |
a1ab4c31 AC |
457 | if (TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL) |
458 | ; | |
459 | else if (BLOCK_VARS (block) == NULL_TREE) | |
460 | { | |
461 | BLOCK_SUBBLOCKS (level->chain->block) | |
61e46a7d NF |
462 | = block_chainon (BLOCK_SUBBLOCKS (block), |
463 | BLOCK_SUBBLOCKS (level->chain->block)); | |
a1ab4c31 AC |
464 | BLOCK_CHAIN (block) = free_block_chain; |
465 | free_block_chain = block; | |
466 | } | |
467 | else | |
468 | { | |
469 | BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (level->chain->block); | |
470 | BLOCK_SUBBLOCKS (level->chain->block) = block; | |
471 | TREE_USED (block) = 1; | |
472 | set_block_for_group (block); | |
473 | } | |
474 | ||
475 | /* Free this binding structure. */ | |
476 | current_binding_level = level->chain; | |
477 | level->chain = free_binding_level; | |
478 | free_binding_level = level; | |
479 | } | |
480 | ||
2231f17f EB |
481 | /* Exit a binding level and discard the associated BLOCK. */ |
482 | ||
483 | void | |
484 | gnat_zaplevel (void) | |
485 | { | |
486 | struct gnat_binding_level *level = current_binding_level; | |
487 | tree block = level->block; | |
488 | ||
489 | BLOCK_CHAIN (block) = free_block_chain; | |
490 | free_block_chain = block; | |
491 | ||
492 | /* Free this binding structure. */ | |
493 | current_binding_level = level->chain; | |
494 | level->chain = free_binding_level; | |
495 | free_binding_level = level; | |
496 | } | |
a1ab4c31 AC |
497 | \f |
498 | /* Records a ..._DECL node DECL as belonging to the current lexical scope | |
499 | and uses GNAT_NODE for location information and propagating flags. */ | |
500 | ||
501 | void | |
502 | gnat_pushdecl (tree decl, Node_Id gnat_node) | |
503 | { | |
bd9c7fb9 EB |
504 | /* If this decl is public external or at toplevel, there is no context. */ |
505 | if ((TREE_PUBLIC (decl) && DECL_EXTERNAL (decl)) || global_bindings_p ()) | |
a1ab4c31 AC |
506 | DECL_CONTEXT (decl) = 0; |
507 | else | |
508 | { | |
509 | DECL_CONTEXT (decl) = current_function_decl; | |
510 | ||
9f62cb92 JJ |
511 | /* Functions imported in another function are not really nested. |
512 | For really nested functions mark them initially as needing | |
513 | a static chain for uses of that flag before unnesting; | |
514 | lower_nested_functions will then recompute it. */ | |
515 | if (TREE_CODE (decl) == FUNCTION_DECL && !TREE_PUBLIC (decl)) | |
516 | DECL_STATIC_CHAIN (decl) = 1; | |
a1ab4c31 AC |
517 | } |
518 | ||
519 | TREE_NO_WARNING (decl) = (gnat_node == Empty || Warnings_Off (gnat_node)); | |
520 | ||
521 | /* Set the location of DECL and emit a declaration for it. */ | |
522 | if (Present (gnat_node)) | |
523 | Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (decl)); | |
524 | add_decl_expr (decl, gnat_node); | |
525 | ||
526 | /* Put the declaration on the list. The list of declarations is in reverse | |
2231f17f EB |
527 | order. The list will be reversed later. Put global declarations in the |
528 | globals list and local ones in the current block. But skip TYPE_DECLs | |
529 | for UNCONSTRAINED_ARRAY_TYPE in both cases, as they will cause trouble | |
530 | with the debugger and aren't needed anyway. */ | |
531 | if (!(TREE_CODE (decl) == TYPE_DECL | |
532 | && TREE_CODE (TREE_TYPE (decl)) == UNCONSTRAINED_ARRAY_TYPE)) | |
a1ab4c31 AC |
533 | { |
534 | if (global_bindings_p ()) | |
535 | { | |
536 | VEC_safe_push (tree, gc, global_decls, decl); | |
537 | ||
538 | if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)) | |
539 | VEC_safe_push (tree, gc, builtin_decls, decl); | |
540 | } | |
2231f17f | 541 | else if (!DECL_EXTERNAL (decl)) |
a1ab4c31 | 542 | { |
a963da4d EB |
543 | DECL_CHAIN (decl) = BLOCK_VARS (current_binding_level->block); |
544 | BLOCK_VARS (current_binding_level->block) = decl; | |
a1ab4c31 AC |
545 | } |
546 | } | |
547 | ||
548 | /* For the declaration of a type, set its name if it either is not already | |
10069d53 | 549 | set or if the previous type name was not derived from a source name. |
a1ab4c31 AC |
550 | We'd rather have the type named with a real name and all the pointer |
551 | types to the same object have the same POINTER_TYPE node. Code in the | |
552 | equivalent function of c-decl.c makes a copy of the type node here, but | |
553 | that may cause us trouble with incomplete types. We make an exception | |
554 | for fat pointer types because the compiler automatically builds them | |
555 | for unconstrained array types and the debugger uses them to represent | |
556 | both these and pointers to these. */ | |
557 | if (TREE_CODE (decl) == TYPE_DECL && DECL_NAME (decl)) | |
558 | { | |
559 | tree t = TREE_TYPE (decl); | |
560 | ||
10069d53 | 561 | if (!(TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)) |
1aeb40dd | 562 | { |
4cb12a90 | 563 | /* Array and pointer types aren't "tagged" types so we force the |
1aeb40dd EB |
564 | type to be associated with its typedef in the DWARF back-end, |
565 | in order to make sure that the latter is always preserved. */ | |
4cb12a90 EB |
566 | if (!DECL_ARTIFICIAL (decl) |
567 | && (TREE_CODE (t) == ARRAY_TYPE | |
568 | || TREE_CODE (t) == POINTER_TYPE)) | |
1aeb40dd EB |
569 | { |
570 | tree tt = build_distinct_type_copy (t); | |
4cb12a90 EB |
571 | if (TREE_CODE (t) == POINTER_TYPE) |
572 | TYPE_NEXT_PTR_TO (t) = tt; | |
1aeb40dd EB |
573 | TYPE_NAME (tt) = DECL_NAME (decl); |
574 | TYPE_STUB_DECL (tt) = TYPE_STUB_DECL (t); | |
575 | DECL_ORIGINAL_TYPE (decl) = tt; | |
576 | } | |
577 | } | |
315cff15 | 578 | else if (TYPE_IS_FAT_POINTER_P (t)) |
a1ab4c31 | 579 | { |
e3edbd56 | 580 | /* We need a variant for the placeholder machinery to work. */ |
a1ab4c31 AC |
581 | tree tt = build_variant_type_copy (t); |
582 | TYPE_NAME (tt) = decl; | |
583 | TREE_USED (tt) = TREE_USED (t); | |
584 | TREE_TYPE (decl) = tt; | |
40c88b94 EB |
585 | if (DECL_ORIGINAL_TYPE (TYPE_NAME (t))) |
586 | DECL_ORIGINAL_TYPE (decl) = DECL_ORIGINAL_TYPE (TYPE_NAME (t)); | |
587 | else | |
588 | DECL_ORIGINAL_TYPE (decl) = t; | |
40c88b94 | 589 | DECL_ARTIFICIAL (decl) = 0; |
e3edbd56 | 590 | t = NULL_TREE; |
a1ab4c31 AC |
591 | } |
592 | else if (DECL_ARTIFICIAL (TYPE_NAME (t)) && !DECL_ARTIFICIAL (decl)) | |
593 | ; | |
594 | else | |
595 | t = NULL_TREE; | |
596 | ||
e3edbd56 EB |
597 | /* Propagate the name to all the anonymous variants. This is needed |
598 | for the type qualifiers machinery to work properly. */ | |
a1ab4c31 AC |
599 | if (t) |
600 | for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t)) | |
e3edbd56 EB |
601 | if (!(TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)) |
602 | TYPE_NAME (t) = decl; | |
a1ab4c31 AC |
603 | } |
604 | } | |
605 | \f | |
1aeb40dd EB |
606 | /* Record TYPE as a builtin type for Ada. NAME is the name of the type. |
607 | ARTIFICIAL_P is true if it's a type that was generated by the compiler. */ | |
a1ab4c31 AC |
608 | |
609 | void | |
1aeb40dd | 610 | record_builtin_type (const char *name, tree type, bool artificial_p) |
a1ab4c31 | 611 | { |
c172df28 AH |
612 | tree type_decl = build_decl (input_location, |
613 | TYPE_DECL, get_identifier (name), type); | |
1aeb40dd | 614 | DECL_ARTIFICIAL (type_decl) = artificial_p; |
10069d53 | 615 | gnat_pushdecl (type_decl, Empty); |
a1ab4c31 | 616 | |
10069d53 EB |
617 | if (debug_hooks->type_decl) |
618 | debug_hooks->type_decl (type_decl, false); | |
a1ab4c31 AC |
619 | } |
620 | \f | |
e3edbd56 EB |
621 | /* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST, |
622 | finish constructing the record type as a fat pointer type. */ | |
623 | ||
624 | void | |
625 | finish_fat_pointer_type (tree record_type, tree field_list) | |
626 | { | |
627 | /* Make sure we can put it into a register. */ | |
628 | TYPE_ALIGN (record_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE); | |
629 | ||
630 | /* Show what it really is. */ | |
631 | TYPE_FAT_POINTER_P (record_type) = 1; | |
632 | ||
633 | /* Do not emit debug info for it since the types of its fields may still be | |
634 | incomplete at this point. */ | |
635 | finish_record_type (record_type, field_list, 0, false); | |
636 | ||
637 | /* Force type_contains_placeholder_p to return true on it. Although the | |
638 | PLACEHOLDER_EXPRs are referenced only indirectly, this isn't a pointer | |
639 | type but the representation of the unconstrained array. */ | |
640 | TYPE_CONTAINS_PLACEHOLDER_INTERNAL (record_type) = 2; | |
641 | } | |
642 | ||
032d1b71 | 643 | /* Given a record type RECORD_TYPE and a list of FIELD_DECL nodes FIELD_LIST, |
a1ab4c31 AC |
644 | finish constructing the record or union type. If REP_LEVEL is zero, this |
645 | record has no representation clause and so will be entirely laid out here. | |
646 | If REP_LEVEL is one, this record has a representation clause and has been | |
647 | laid out already; only set the sizes and alignment. If REP_LEVEL is two, | |
648 | this record is derived from a parent record and thus inherits its layout; | |
032d1b71 EB |
649 | only make a pass on the fields to finalize them. DEBUG_INFO_P is true if |
650 | we need to write debug information about this type. */ | |
a1ab4c31 AC |
651 | |
652 | void | |
032d1b71 EB |
653 | finish_record_type (tree record_type, tree field_list, int rep_level, |
654 | bool debug_info_p) | |
a1ab4c31 AC |
655 | { |
656 | enum tree_code code = TREE_CODE (record_type); | |
657 | tree name = TYPE_NAME (record_type); | |
658 | tree ada_size = bitsize_zero_node; | |
659 | tree size = bitsize_zero_node; | |
660 | bool had_size = TYPE_SIZE (record_type) != 0; | |
661 | bool had_size_unit = TYPE_SIZE_UNIT (record_type) != 0; | |
662 | bool had_align = TYPE_ALIGN (record_type) != 0; | |
663 | tree field; | |
664 | ||
032d1b71 | 665 | TYPE_FIELDS (record_type) = field_list; |
a1ab4c31 | 666 | |
10069d53 EB |
667 | /* Always attach the TYPE_STUB_DECL for a record type. It is required to |
668 | generate debug info and have a parallel type. */ | |
669 | if (name && TREE_CODE (name) == TYPE_DECL) | |
670 | name = DECL_NAME (name); | |
671 | TYPE_STUB_DECL (record_type) = create_type_stub_decl (name, record_type); | |
a1ab4c31 AC |
672 | |
673 | /* Globally initialize the record first. If this is a rep'ed record, | |
674 | that just means some initializations; otherwise, layout the record. */ | |
675 | if (rep_level > 0) | |
676 | { | |
677 | TYPE_ALIGN (record_type) = MAX (BITS_PER_UNIT, TYPE_ALIGN (record_type)); | |
a1ab4c31 AC |
678 | |
679 | if (!had_size_unit) | |
680 | TYPE_SIZE_UNIT (record_type) = size_zero_node; | |
b1fa9126 | 681 | |
a1ab4c31 AC |
682 | if (!had_size) |
683 | TYPE_SIZE (record_type) = bitsize_zero_node; | |
684 | ||
685 | /* For all-repped records with a size specified, lay the QUAL_UNION_TYPE | |
686 | out just like a UNION_TYPE, since the size will be fixed. */ | |
687 | else if (code == QUAL_UNION_TYPE) | |
688 | code = UNION_TYPE; | |
689 | } | |
690 | else | |
691 | { | |
692 | /* Ensure there isn't a size already set. There can be in an error | |
693 | case where there is a rep clause but all fields have errors and | |
694 | no longer have a position. */ | |
695 | TYPE_SIZE (record_type) = 0; | |
696 | layout_type (record_type); | |
697 | } | |
698 | ||
699 | /* At this point, the position and size of each field is known. It was | |
700 | either set before entry by a rep clause, or by laying out the type above. | |
701 | ||
702 | We now run a pass over the fields (in reverse order for QUAL_UNION_TYPEs) | |
703 | to compute the Ada size; the GCC size and alignment (for rep'ed records | |
704 | that are not padding types); and the mode (for rep'ed records). We also | |
705 | clear the DECL_BIT_FIELD indication for the cases we know have not been | |
706 | handled yet, and adjust DECL_NONADDRESSABLE_P accordingly. */ | |
707 | ||
708 | if (code == QUAL_UNION_TYPE) | |
032d1b71 | 709 | field_list = nreverse (field_list); |
a1ab4c31 | 710 | |
910ad8de | 711 | for (field = field_list; field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
712 | { |
713 | tree type = TREE_TYPE (field); | |
714 | tree pos = bit_position (field); | |
715 | tree this_size = DECL_SIZE (field); | |
716 | tree this_ada_size; | |
717 | ||
718 | if ((TREE_CODE (type) == RECORD_TYPE | |
719 | || TREE_CODE (type) == UNION_TYPE | |
720 | || TREE_CODE (type) == QUAL_UNION_TYPE) | |
315cff15 | 721 | && !TYPE_FAT_POINTER_P (type) |
a1ab4c31 AC |
722 | && !TYPE_CONTAINS_TEMPLATE_P (type) |
723 | && TYPE_ADA_SIZE (type)) | |
724 | this_ada_size = TYPE_ADA_SIZE (type); | |
725 | else | |
726 | this_ada_size = this_size; | |
727 | ||
728 | /* Clear DECL_BIT_FIELD for the cases layout_decl does not handle. */ | |
729 | if (DECL_BIT_FIELD (field) | |
730 | && operand_equal_p (this_size, TYPE_SIZE (type), 0)) | |
731 | { | |
732 | unsigned int align = TYPE_ALIGN (type); | |
733 | ||
734 | /* In the general case, type alignment is required. */ | |
735 | if (value_factor_p (pos, align)) | |
736 | { | |
737 | /* The enclosing record type must be sufficiently aligned. | |
738 | Otherwise, if no alignment was specified for it and it | |
739 | has been laid out already, bump its alignment to the | |
740 | desired one if this is compatible with its size. */ | |
741 | if (TYPE_ALIGN (record_type) >= align) | |
742 | { | |
743 | DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align); | |
744 | DECL_BIT_FIELD (field) = 0; | |
745 | } | |
746 | else if (!had_align | |
747 | && rep_level == 0 | |
748 | && value_factor_p (TYPE_SIZE (record_type), align)) | |
749 | { | |
750 | TYPE_ALIGN (record_type) = align; | |
751 | DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align); | |
752 | DECL_BIT_FIELD (field) = 0; | |
753 | } | |
754 | } | |
755 | ||
756 | /* In the non-strict alignment case, only byte alignment is. */ | |
757 | if (!STRICT_ALIGNMENT | |
758 | && DECL_BIT_FIELD (field) | |
759 | && value_factor_p (pos, BITS_PER_UNIT)) | |
760 | DECL_BIT_FIELD (field) = 0; | |
761 | } | |
762 | ||
c1abd261 EB |
763 | /* If we still have DECL_BIT_FIELD set at this point, we know that the |
764 | field is technically not addressable. Except that it can actually | |
765 | be addressed if it is BLKmode and happens to be properly aligned. */ | |
766 | if (DECL_BIT_FIELD (field) | |
767 | && !(DECL_MODE (field) == BLKmode | |
768 | && value_factor_p (pos, BITS_PER_UNIT))) | |
769 | DECL_NONADDRESSABLE_P (field) = 1; | |
a1ab4c31 AC |
770 | |
771 | /* A type must be as aligned as its most aligned field that is not | |
772 | a bit-field. But this is already enforced by layout_type. */ | |
773 | if (rep_level > 0 && !DECL_BIT_FIELD (field)) | |
774 | TYPE_ALIGN (record_type) | |
775 | = MAX (TYPE_ALIGN (record_type), DECL_ALIGN (field)); | |
776 | ||
777 | switch (code) | |
778 | { | |
779 | case UNION_TYPE: | |
780 | ada_size = size_binop (MAX_EXPR, ada_size, this_ada_size); | |
781 | size = size_binop (MAX_EXPR, size, this_size); | |
782 | break; | |
783 | ||
784 | case QUAL_UNION_TYPE: | |
785 | ada_size | |
786 | = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field), | |
787 | this_ada_size, ada_size); | |
788 | size = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field), | |
789 | this_size, size); | |
790 | break; | |
791 | ||
792 | case RECORD_TYPE: | |
793 | /* Since we know here that all fields are sorted in order of | |
794 | increasing bit position, the size of the record is one | |
795 | higher than the ending bit of the last field processed | |
796 | unless we have a rep clause, since in that case we might | |
797 | have a field outside a QUAL_UNION_TYPE that has a higher ending | |
798 | position. So use a MAX in that case. Also, if this field is a | |
799 | QUAL_UNION_TYPE, we need to take into account the previous size in | |
800 | the case of empty variants. */ | |
801 | ada_size | |
802 | = merge_sizes (ada_size, pos, this_ada_size, | |
803 | TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0); | |
804 | size | |
805 | = merge_sizes (size, pos, this_size, | |
806 | TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0); | |
807 | break; | |
808 | ||
809 | default: | |
810 | gcc_unreachable (); | |
811 | } | |
812 | } | |
813 | ||
814 | if (code == QUAL_UNION_TYPE) | |
032d1b71 | 815 | nreverse (field_list); |
a1ab4c31 AC |
816 | |
817 | if (rep_level < 2) | |
818 | { | |
819 | /* If this is a padding record, we never want to make the size smaller | |
820 | than what was specified in it, if any. */ | |
315cff15 | 821 | if (TYPE_IS_PADDING_P (record_type) && TYPE_SIZE (record_type)) |
a1ab4c31 AC |
822 | size = TYPE_SIZE (record_type); |
823 | ||
824 | /* Now set any of the values we've just computed that apply. */ | |
315cff15 | 825 | if (!TYPE_FAT_POINTER_P (record_type) |
a1ab4c31 AC |
826 | && !TYPE_CONTAINS_TEMPLATE_P (record_type)) |
827 | SET_TYPE_ADA_SIZE (record_type, ada_size); | |
828 | ||
829 | if (rep_level > 0) | |
830 | { | |
831 | tree size_unit = had_size_unit | |
832 | ? TYPE_SIZE_UNIT (record_type) | |
833 | : convert (sizetype, | |
834 | size_binop (CEIL_DIV_EXPR, size, | |
835 | bitsize_unit_node)); | |
836 | unsigned int align = TYPE_ALIGN (record_type); | |
837 | ||
838 | TYPE_SIZE (record_type) = variable_size (round_up (size, align)); | |
839 | TYPE_SIZE_UNIT (record_type) | |
840 | = variable_size (round_up (size_unit, align / BITS_PER_UNIT)); | |
841 | ||
842 | compute_record_mode (record_type); | |
843 | } | |
844 | } | |
845 | ||
032d1b71 | 846 | if (debug_info_p) |
a1ab4c31 AC |
847 | rest_of_record_type_compilation (record_type); |
848 | } | |
849 | ||
032d1b71 EB |
850 | /* Wrap up compilation of RECORD_TYPE, i.e. output all the debug information |
851 | associated with it. It need not be invoked directly in most cases since | |
852 | finish_record_type takes care of doing so, but this can be necessary if | |
853 | a parallel type is to be attached to the record type. */ | |
a1ab4c31 AC |
854 | |
855 | void | |
856 | rest_of_record_type_compilation (tree record_type) | |
857 | { | |
032d1b71 | 858 | tree field_list = TYPE_FIELDS (record_type); |
a1ab4c31 AC |
859 | tree field; |
860 | enum tree_code code = TREE_CODE (record_type); | |
861 | bool var_size = false; | |
862 | ||
910ad8de | 863 | for (field = field_list; field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
864 | { |
865 | /* We need to make an XVE/XVU record if any field has variable size, | |
866 | whether or not the record does. For example, if we have a union, | |
867 | it may be that all fields, rounded up to the alignment, have the | |
868 | same size, in which case we'll use that size. But the debug | |
869 | output routines (except Dwarf2) won't be able to output the fields, | |
870 | so we need to make the special record. */ | |
871 | if (TREE_CODE (DECL_SIZE (field)) != INTEGER_CST | |
872 | /* If a field has a non-constant qualifier, the record will have | |
873 | variable size too. */ | |
874 | || (code == QUAL_UNION_TYPE | |
875 | && TREE_CODE (DECL_QUALIFIER (field)) != INTEGER_CST)) | |
876 | { | |
877 | var_size = true; | |
878 | break; | |
879 | } | |
880 | } | |
881 | ||
882 | /* If this record is of variable size, rename it so that the | |
883 | debugger knows it is and make a new, parallel, record | |
884 | that tells the debugger how the record is laid out. See | |
885 | exp_dbug.ads. But don't do this for records that are padding | |
886 | since they confuse GDB. */ | |
315cff15 | 887 | if (var_size && !TYPE_IS_PADDING_P (record_type)) |
a1ab4c31 AC |
888 | { |
889 | tree new_record_type | |
890 | = make_node (TREE_CODE (record_type) == QUAL_UNION_TYPE | |
891 | ? UNION_TYPE : TREE_CODE (record_type)); | |
0fb2335d | 892 | tree orig_name = TYPE_NAME (record_type), new_name; |
a1ab4c31 | 893 | tree last_pos = bitsize_zero_node; |
0fb2335d | 894 | tree old_field, prev_old_field = NULL_TREE; |
a1ab4c31 | 895 | |
0fb2335d EB |
896 | if (TREE_CODE (orig_name) == TYPE_DECL) |
897 | orig_name = DECL_NAME (orig_name); | |
898 | ||
899 | new_name | |
900 | = concat_name (orig_name, TREE_CODE (record_type) == QUAL_UNION_TYPE | |
901 | ? "XVU" : "XVE"); | |
902 | TYPE_NAME (new_record_type) = new_name; | |
a1ab4c31 AC |
903 | TYPE_ALIGN (new_record_type) = BIGGEST_ALIGNMENT; |
904 | TYPE_STUB_DECL (new_record_type) | |
0fb2335d | 905 | = create_type_stub_decl (new_name, new_record_type); |
a1ab4c31 AC |
906 | DECL_IGNORED_P (TYPE_STUB_DECL (new_record_type)) |
907 | = DECL_IGNORED_P (TYPE_STUB_DECL (record_type)); | |
908 | TYPE_SIZE (new_record_type) = size_int (TYPE_ALIGN (record_type)); | |
909 | TYPE_SIZE_UNIT (new_record_type) | |
910 | = size_int (TYPE_ALIGN (record_type) / BITS_PER_UNIT); | |
911 | ||
912 | add_parallel_type (TYPE_STUB_DECL (record_type), new_record_type); | |
913 | ||
914 | /* Now scan all the fields, replacing each field with a new | |
915 | field corresponding to the new encoding. */ | |
916 | for (old_field = TYPE_FIELDS (record_type); old_field; | |
910ad8de | 917 | old_field = DECL_CHAIN (old_field)) |
a1ab4c31 AC |
918 | { |
919 | tree field_type = TREE_TYPE (old_field); | |
920 | tree field_name = DECL_NAME (old_field); | |
921 | tree new_field; | |
922 | tree curpos = bit_position (old_field); | |
923 | bool var = false; | |
924 | unsigned int align = 0; | |
925 | tree pos; | |
926 | ||
927 | /* See how the position was modified from the last position. | |
928 | ||
929 | There are two basic cases we support: a value was added | |
930 | to the last position or the last position was rounded to | |
931 | a boundary and they something was added. Check for the | |
932 | first case first. If not, see if there is any evidence | |
933 | of rounding. If so, round the last position and try | |
934 | again. | |
935 | ||
936 | If this is a union, the position can be taken as zero. */ | |
937 | ||
938 | /* Some computations depend on the shape of the position expression, | |
939 | so strip conversions to make sure it's exposed. */ | |
940 | curpos = remove_conversions (curpos, true); | |
941 | ||
942 | if (TREE_CODE (new_record_type) == UNION_TYPE) | |
943 | pos = bitsize_zero_node, align = 0; | |
944 | else | |
945 | pos = compute_related_constant (curpos, last_pos); | |
946 | ||
947 | if (!pos && TREE_CODE (curpos) == MULT_EXPR | |
948 | && host_integerp (TREE_OPERAND (curpos, 1), 1)) | |
949 | { | |
950 | tree offset = TREE_OPERAND (curpos, 0); | |
951 | align = tree_low_cst (TREE_OPERAND (curpos, 1), 1); | |
952 | ||
953 | /* An offset which is a bitwise AND with a negative power of 2 | |
728936bb EB |
954 | means an alignment corresponding to this power of 2. Note |
955 | that, as sizetype is sign-extended but nonetheless unsigned, | |
956 | we don't directly use tree_int_cst_sgn. */ | |
a1ab4c31 AC |
957 | offset = remove_conversions (offset, true); |
958 | if (TREE_CODE (offset) == BIT_AND_EXPR | |
959 | && host_integerp (TREE_OPERAND (offset, 1), 0) | |
728936bb | 960 | && TREE_INT_CST_HIGH (TREE_OPERAND (offset, 1)) < 0) |
a1ab4c31 AC |
961 | { |
962 | unsigned int pow | |
963 | = - tree_low_cst (TREE_OPERAND (offset, 1), 0); | |
964 | if (exact_log2 (pow) > 0) | |
965 | align *= pow; | |
966 | } | |
967 | ||
968 | pos = compute_related_constant (curpos, | |
969 | round_up (last_pos, align)); | |
970 | } | |
971 | else if (!pos && TREE_CODE (curpos) == PLUS_EXPR | |
972 | && TREE_CODE (TREE_OPERAND (curpos, 1)) == INTEGER_CST | |
973 | && TREE_CODE (TREE_OPERAND (curpos, 0)) == MULT_EXPR | |
974 | && host_integerp (TREE_OPERAND | |
975 | (TREE_OPERAND (curpos, 0), 1), | |
976 | 1)) | |
977 | { | |
978 | align | |
979 | = tree_low_cst | |
980 | (TREE_OPERAND (TREE_OPERAND (curpos, 0), 1), 1); | |
981 | pos = compute_related_constant (curpos, | |
982 | round_up (last_pos, align)); | |
983 | } | |
984 | else if (potential_alignment_gap (prev_old_field, old_field, | |
985 | pos)) | |
986 | { | |
987 | align = TYPE_ALIGN (field_type); | |
988 | pos = compute_related_constant (curpos, | |
989 | round_up (last_pos, align)); | |
990 | } | |
991 | ||
992 | /* If we can't compute a position, set it to zero. | |
993 | ||
994 | ??? We really should abort here, but it's too much work | |
995 | to get this correct for all cases. */ | |
996 | ||
997 | if (!pos) | |
998 | pos = bitsize_zero_node; | |
999 | ||
1000 | /* See if this type is variable-sized and make a pointer type | |
1001 | and indicate the indirection if so. Beware that the debug | |
1002 | back-end may adjust the position computed above according | |
1003 | to the alignment of the field type, i.e. the pointer type | |
1004 | in this case, if we don't preventively counter that. */ | |
1005 | if (TREE_CODE (DECL_SIZE (old_field)) != INTEGER_CST) | |
1006 | { | |
1007 | field_type = build_pointer_type (field_type); | |
1008 | if (align != 0 && TYPE_ALIGN (field_type) > align) | |
1009 | { | |
1010 | field_type = copy_node (field_type); | |
1011 | TYPE_ALIGN (field_type) = align; | |
1012 | } | |
1013 | var = true; | |
1014 | } | |
1015 | ||
1016 | /* Make a new field name, if necessary. */ | |
1017 | if (var || align != 0) | |
1018 | { | |
1019 | char suffix[16]; | |
1020 | ||
1021 | if (align != 0) | |
1022 | sprintf (suffix, "XV%c%u", var ? 'L' : 'A', | |
1023 | align / BITS_PER_UNIT); | |
1024 | else | |
1025 | strcpy (suffix, "XVL"); | |
1026 | ||
0fb2335d | 1027 | field_name = concat_name (field_name, suffix); |
a1ab4c31 AC |
1028 | } |
1029 | ||
da01bfee EB |
1030 | new_field |
1031 | = create_field_decl (field_name, field_type, new_record_type, | |
1032 | DECL_SIZE (old_field), pos, 0, 0); | |
910ad8de | 1033 | DECL_CHAIN (new_field) = TYPE_FIELDS (new_record_type); |
a1ab4c31 AC |
1034 | TYPE_FIELDS (new_record_type) = new_field; |
1035 | ||
1036 | /* If old_field is a QUAL_UNION_TYPE, take its size as being | |
1037 | zero. The only time it's not the last field of the record | |
1038 | is when there are other components at fixed positions after | |
1039 | it (meaning there was a rep clause for every field) and we | |
1040 | want to be able to encode them. */ | |
1041 | last_pos = size_binop (PLUS_EXPR, bit_position (old_field), | |
1042 | (TREE_CODE (TREE_TYPE (old_field)) | |
1043 | == QUAL_UNION_TYPE) | |
1044 | ? bitsize_zero_node | |
1045 | : DECL_SIZE (old_field)); | |
1046 | prev_old_field = old_field; | |
1047 | } | |
1048 | ||
1049 | TYPE_FIELDS (new_record_type) | |
1050 | = nreverse (TYPE_FIELDS (new_record_type)); | |
1051 | ||
1052 | rest_of_type_decl_compilation (TYPE_STUB_DECL (new_record_type)); | |
1053 | } | |
1054 | ||
1055 | rest_of_type_decl_compilation (TYPE_STUB_DECL (record_type)); | |
1056 | } | |
1057 | ||
1058 | /* Append PARALLEL_TYPE on the chain of parallel types for decl. */ | |
1059 | ||
1060 | void | |
1061 | add_parallel_type (tree decl, tree parallel_type) | |
1062 | { | |
1063 | tree d = decl; | |
1064 | ||
1065 | while (DECL_PARALLEL_TYPE (d)) | |
1066 | d = TYPE_STUB_DECL (DECL_PARALLEL_TYPE (d)); | |
1067 | ||
1068 | SET_DECL_PARALLEL_TYPE (d, parallel_type); | |
1069 | } | |
1070 | ||
a1ab4c31 | 1071 | /* Utility function of above to merge LAST_SIZE, the previous size of a record |
1e17ef87 EB |
1072 | with FIRST_BIT and SIZE that describe a field. SPECIAL is true if this |
1073 | represents a QUAL_UNION_TYPE in which case we must look for COND_EXPRs and | |
1074 | replace a value of zero with the old size. If HAS_REP is true, we take the | |
1075 | MAX of the end position of this field with LAST_SIZE. In all other cases, | |
1076 | we use FIRST_BIT plus SIZE. Return an expression for the size. */ | |
a1ab4c31 AC |
1077 | |
1078 | static tree | |
1079 | merge_sizes (tree last_size, tree first_bit, tree size, bool special, | |
1080 | bool has_rep) | |
1081 | { | |
1082 | tree type = TREE_TYPE (last_size); | |
c6bd4220 | 1083 | tree new_size; |
a1ab4c31 AC |
1084 | |
1085 | if (!special || TREE_CODE (size) != COND_EXPR) | |
1086 | { | |
c6bd4220 | 1087 | new_size = size_binop (PLUS_EXPR, first_bit, size); |
a1ab4c31 | 1088 | if (has_rep) |
c6bd4220 | 1089 | new_size = size_binop (MAX_EXPR, last_size, new_size); |
a1ab4c31 AC |
1090 | } |
1091 | ||
1092 | else | |
c6bd4220 EB |
1093 | new_size = fold_build3 (COND_EXPR, type, TREE_OPERAND (size, 0), |
1094 | integer_zerop (TREE_OPERAND (size, 1)) | |
1095 | ? last_size : merge_sizes (last_size, first_bit, | |
1096 | TREE_OPERAND (size, 1), | |
1097 | 1, has_rep), | |
1098 | integer_zerop (TREE_OPERAND (size, 2)) | |
1099 | ? last_size : merge_sizes (last_size, first_bit, | |
1100 | TREE_OPERAND (size, 2), | |
1101 | 1, has_rep)); | |
a1ab4c31 AC |
1102 | |
1103 | /* We don't need any NON_VALUE_EXPRs and they can confuse us (especially | |
1104 | when fed through substitute_in_expr) into thinking that a constant | |
1105 | size is not constant. */ | |
c6bd4220 EB |
1106 | while (TREE_CODE (new_size) == NON_LVALUE_EXPR) |
1107 | new_size = TREE_OPERAND (new_size, 0); | |
a1ab4c31 | 1108 | |
c6bd4220 | 1109 | return new_size; |
a1ab4c31 AC |
1110 | } |
1111 | ||
1112 | /* Utility function of above to see if OP0 and OP1, both of SIZETYPE, are | |
1113 | related by the addition of a constant. Return that constant if so. */ | |
1114 | ||
1115 | static tree | |
1116 | compute_related_constant (tree op0, tree op1) | |
1117 | { | |
1118 | tree op0_var, op1_var; | |
1119 | tree op0_con = split_plus (op0, &op0_var); | |
1120 | tree op1_con = split_plus (op1, &op1_var); | |
1121 | tree result = size_binop (MINUS_EXPR, op0_con, op1_con); | |
1122 | ||
1123 | if (operand_equal_p (op0_var, op1_var, 0)) | |
1124 | return result; | |
1125 | else if (operand_equal_p (op0, size_binop (PLUS_EXPR, op1_var, result), 0)) | |
1126 | return result; | |
1127 | else | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | /* Utility function of above to split a tree OP which may be a sum, into a | |
1132 | constant part, which is returned, and a variable part, which is stored | |
1133 | in *PVAR. *PVAR may be bitsize_zero_node. All operations must be of | |
1134 | bitsizetype. */ | |
1135 | ||
1136 | static tree | |
1137 | split_plus (tree in, tree *pvar) | |
1138 | { | |
1139 | /* Strip NOPS in order to ease the tree traversal and maximize the | |
1140 | potential for constant or plus/minus discovery. We need to be careful | |
1141 | to always return and set *pvar to bitsizetype trees, but it's worth | |
1142 | the effort. */ | |
1143 | STRIP_NOPS (in); | |
1144 | ||
1145 | *pvar = convert (bitsizetype, in); | |
1146 | ||
1147 | if (TREE_CODE (in) == INTEGER_CST) | |
1148 | { | |
1149 | *pvar = bitsize_zero_node; | |
1150 | return convert (bitsizetype, in); | |
1151 | } | |
1152 | else if (TREE_CODE (in) == PLUS_EXPR || TREE_CODE (in) == MINUS_EXPR) | |
1153 | { | |
1154 | tree lhs_var, rhs_var; | |
1155 | tree lhs_con = split_plus (TREE_OPERAND (in, 0), &lhs_var); | |
1156 | tree rhs_con = split_plus (TREE_OPERAND (in, 1), &rhs_var); | |
1157 | ||
1158 | if (lhs_var == TREE_OPERAND (in, 0) | |
1159 | && rhs_var == TREE_OPERAND (in, 1)) | |
1160 | return bitsize_zero_node; | |
1161 | ||
1162 | *pvar = size_binop (TREE_CODE (in), lhs_var, rhs_var); | |
1163 | return size_binop (TREE_CODE (in), lhs_con, rhs_con); | |
1164 | } | |
1165 | else | |
1166 | return bitsize_zero_node; | |
1167 | } | |
1168 | \f | |
d47d0a8d EB |
1169 | /* Return a FUNCTION_TYPE node. RETURN_TYPE is the type returned by the |
1170 | subprogram. If it is VOID_TYPE, then we are dealing with a procedure, | |
1171 | otherwise we are dealing with a function. PARAM_DECL_LIST is a list of | |
1172 | PARM_DECL nodes that are the subprogram parameters. CICO_LIST is the | |
1173 | copy-in/copy-out list to be stored into the TYPE_CICO_LIST field. | |
1174 | RETURN_UNCONSTRAINED_P is true if the function returns an unconstrained | |
1175 | object. RETURN_BY_DIRECT_REF_P is true if the function returns by direct | |
1176 | reference. RETURN_BY_INVISI_REF_P is true if the function returns by | |
1177 | invisible reference. */ | |
a1ab4c31 AC |
1178 | |
1179 | tree | |
1180 | create_subprog_type (tree return_type, tree param_decl_list, tree cico_list, | |
d47d0a8d EB |
1181 | bool return_unconstrained_p, bool return_by_direct_ref_p, |
1182 | bool return_by_invisi_ref_p) | |
a1ab4c31 | 1183 | { |
e5b00edf NF |
1184 | /* A list of the data type nodes of the subprogram formal parameters. |
1185 | This list is generated by traversing the input list of PARM_DECL | |
1186 | nodes. */ | |
1187 | VEC(tree,gc) *param_type_list = NULL; | |
d47d0a8d | 1188 | tree t, type; |
a1ab4c31 | 1189 | |
910ad8de | 1190 | for (t = param_decl_list; t; t = DECL_CHAIN (t)) |
e5b00edf | 1191 | VEC_safe_push (tree, gc, param_type_list, TREE_TYPE (t)); |
a1ab4c31 | 1192 | |
e5b00edf | 1193 | type = build_function_type_vec (return_type, param_type_list); |
a1ab4c31 | 1194 | |
d47d0a8d EB |
1195 | /* TYPE may have been shared since GCC hashes types. If it has a different |
1196 | CICO_LIST, make a copy. Likewise for the various flags. */ | |
523e82a7 EB |
1197 | if (!fntype_same_flags_p (type, cico_list, return_unconstrained_p, |
1198 | return_by_direct_ref_p, return_by_invisi_ref_p)) | |
d47d0a8d EB |
1199 | { |
1200 | type = copy_type (type); | |
1201 | TYPE_CI_CO_LIST (type) = cico_list; | |
1202 | TYPE_RETURN_UNCONSTRAINED_P (type) = return_unconstrained_p; | |
1203 | TYPE_RETURN_BY_DIRECT_REF_P (type) = return_by_direct_ref_p; | |
1204 | TREE_ADDRESSABLE (type) = return_by_invisi_ref_p; | |
1205 | } | |
a1ab4c31 | 1206 | |
a1ab4c31 AC |
1207 | return type; |
1208 | } | |
1209 | \f | |
1210 | /* Return a copy of TYPE but safe to modify in any way. */ | |
1211 | ||
1212 | tree | |
1213 | copy_type (tree type) | |
1214 | { | |
c6bd4220 | 1215 | tree new_type = copy_node (type); |
a1ab4c31 | 1216 | |
90dcfecb EB |
1217 | /* Unshare the language-specific data. */ |
1218 | if (TYPE_LANG_SPECIFIC (type)) | |
1219 | { | |
1220 | TYPE_LANG_SPECIFIC (new_type) = NULL; | |
1221 | SET_TYPE_LANG_SPECIFIC (new_type, GET_TYPE_LANG_SPECIFIC (type)); | |
1222 | } | |
1223 | ||
1224 | /* And the contents of the language-specific slot if needed. */ | |
1225 | if ((INTEGRAL_TYPE_P (type) || TREE_CODE (type) == REAL_TYPE) | |
1226 | && TYPE_RM_VALUES (type)) | |
1227 | { | |
1228 | TYPE_RM_VALUES (new_type) = NULL_TREE; | |
1229 | SET_TYPE_RM_SIZE (new_type, TYPE_RM_SIZE (type)); | |
1230 | SET_TYPE_RM_MIN_VALUE (new_type, TYPE_RM_MIN_VALUE (type)); | |
1231 | SET_TYPE_RM_MAX_VALUE (new_type, TYPE_RM_MAX_VALUE (type)); | |
1232 | } | |
1233 | ||
a1ab4c31 AC |
1234 | /* copy_node clears this field instead of copying it, because it is |
1235 | aliased with TREE_CHAIN. */ | |
c6bd4220 | 1236 | TYPE_STUB_DECL (new_type) = TYPE_STUB_DECL (type); |
a1ab4c31 | 1237 | |
c6bd4220 EB |
1238 | TYPE_POINTER_TO (new_type) = 0; |
1239 | TYPE_REFERENCE_TO (new_type) = 0; | |
1240 | TYPE_MAIN_VARIANT (new_type) = new_type; | |
1241 | TYPE_NEXT_VARIANT (new_type) = 0; | |
a1ab4c31 | 1242 | |
c6bd4220 | 1243 | return new_type; |
a1ab4c31 AC |
1244 | } |
1245 | \f | |
c1abd261 EB |
1246 | /* Return a subtype of sizetype with range MIN to MAX and whose |
1247 | TYPE_INDEX_TYPE is INDEX. GNAT_NODE is used for the position | |
1248 | of the associated TYPE_DECL. */ | |
a1ab4c31 AC |
1249 | |
1250 | tree | |
1251 | create_index_type (tree min, tree max, tree index, Node_Id gnat_node) | |
1252 | { | |
1253 | /* First build a type for the desired range. */ | |
523e82a7 | 1254 | tree type = build_nonshared_range_type (sizetype, min, max); |
a1ab4c31 | 1255 | |
523e82a7 | 1256 | /* Then set the index type. */ |
a1ab4c31 AC |
1257 | SET_TYPE_INDEX_TYPE (type, index); |
1258 | create_type_decl (NULL_TREE, type, NULL, true, false, gnat_node); | |
c1abd261 | 1259 | |
a1ab4c31 AC |
1260 | return type; |
1261 | } | |
84fb43a1 EB |
1262 | |
1263 | /* Return a subtype of TYPE with range MIN to MAX. If TYPE is NULL, | |
1264 | sizetype is used. */ | |
1265 | ||
1266 | tree | |
1267 | create_range_type (tree type, tree min, tree max) | |
1268 | { | |
1269 | tree range_type; | |
1270 | ||
1271 | if (type == NULL_TREE) | |
1272 | type = sizetype; | |
1273 | ||
1274 | /* First build a type with the base range. */ | |
523e82a7 EB |
1275 | range_type = build_nonshared_range_type (type, TYPE_MIN_VALUE (type), |
1276 | TYPE_MAX_VALUE (type)); | |
84fb43a1 EB |
1277 | |
1278 | /* Then set the actual range. */ | |
523e82a7 EB |
1279 | SET_TYPE_RM_MIN_VALUE (range_type, convert (type, min)); |
1280 | SET_TYPE_RM_MAX_VALUE (range_type, convert (type, max)); | |
84fb43a1 EB |
1281 | |
1282 | return range_type; | |
1283 | } | |
a1ab4c31 | 1284 | \f |
10069d53 EB |
1285 | /* Return a TYPE_DECL node suitable for the TYPE_STUB_DECL field of a type. |
1286 | TYPE_NAME gives the name of the type and TYPE is a ..._TYPE node giving | |
1287 | its data type. */ | |
1288 | ||
1289 | tree | |
1290 | create_type_stub_decl (tree type_name, tree type) | |
1291 | { | |
1292 | /* Using a named TYPE_DECL ensures that a type name marker is emitted in | |
1293 | STABS while setting DECL_ARTIFICIAL ensures that no DW_TAG_typedef is | |
1294 | emitted in DWARF. */ | |
c172df28 AH |
1295 | tree type_decl = build_decl (input_location, |
1296 | TYPE_DECL, type_name, type); | |
10069d53 EB |
1297 | DECL_ARTIFICIAL (type_decl) = 1; |
1298 | return type_decl; | |
1299 | } | |
1300 | ||
1301 | /* Return a TYPE_DECL node. TYPE_NAME gives the name of the type and TYPE | |
1302 | is a ..._TYPE node giving its data type. ARTIFICIAL_P is true if this | |
1303 | is a declaration that was generated by the compiler. DEBUG_INFO_P is | |
1304 | true if we need to write debug information about this type. GNAT_NODE | |
1305 | is used for the position of the decl. */ | |
a1ab4c31 AC |
1306 | |
1307 | tree | |
1308 | create_type_decl (tree type_name, tree type, struct attrib *attr_list, | |
1309 | bool artificial_p, bool debug_info_p, Node_Id gnat_node) | |
1310 | { | |
a1ab4c31 | 1311 | enum tree_code code = TREE_CODE (type); |
10069d53 EB |
1312 | bool named = TYPE_NAME (type) && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL; |
1313 | tree type_decl; | |
a1ab4c31 | 1314 | |
10069d53 EB |
1315 | /* Only the builtin TYPE_STUB_DECL should be used for dummy types. */ |
1316 | gcc_assert (!TYPE_IS_DUMMY_P (type)); | |
a1ab4c31 | 1317 | |
10069d53 EB |
1318 | /* If the type hasn't been named yet, we're naming it; preserve an existing |
1319 | TYPE_STUB_DECL that has been attached to it for some purpose. */ | |
1320 | if (!named && TYPE_STUB_DECL (type)) | |
1321 | { | |
1322 | type_decl = TYPE_STUB_DECL (type); | |
1323 | DECL_NAME (type_decl) = type_name; | |
1324 | } | |
1325 | else | |
c172df28 AH |
1326 | type_decl = build_decl (input_location, |
1327 | TYPE_DECL, type_name, type); | |
a1ab4c31 | 1328 | |
10069d53 | 1329 | DECL_ARTIFICIAL (type_decl) = artificial_p; |
58c8f770 EB |
1330 | |
1331 | /* Add this decl to the current binding level. */ | |
10069d53 | 1332 | gnat_pushdecl (type_decl, gnat_node); |
58c8f770 | 1333 | |
a1ab4c31 AC |
1334 | process_attributes (type_decl, attr_list); |
1335 | ||
10069d53 EB |
1336 | /* If we're naming the type, equate the TYPE_STUB_DECL to the name. |
1337 | This causes the name to be also viewed as a "tag" by the debug | |
1338 | back-end, with the advantage that no DW_TAG_typedef is emitted | |
1339 | for artificial "tagged" types in DWARF. */ | |
1340 | if (!named) | |
1341 | TYPE_STUB_DECL (type) = type_decl; | |
1342 | ||
1343 | /* Pass the type declaration to the debug back-end unless this is an | |
ac53d5f2 EB |
1344 | UNCONSTRAINED_ARRAY_TYPE that the back-end does not support, or a |
1345 | type for which debugging information was not requested, or else an | |
1346 | ENUMERAL_TYPE or RECORD_TYPE (except for fat pointers) which are | |
1347 | handled separately. And do not pass dummy types either. */ | |
a1ab4c31 AC |
1348 | if (code == UNCONSTRAINED_ARRAY_TYPE || !debug_info_p) |
1349 | DECL_IGNORED_P (type_decl) = 1; | |
1350 | else if (code != ENUMERAL_TYPE | |
315cff15 | 1351 | && (code != RECORD_TYPE || TYPE_FAT_POINTER_P (type)) |
a1ab4c31 | 1352 | && !((code == POINTER_TYPE || code == REFERENCE_TYPE) |
ac53d5f2 EB |
1353 | && TYPE_IS_DUMMY_P (TREE_TYPE (type))) |
1354 | && !(code == RECORD_TYPE | |
1355 | && TYPE_IS_DUMMY_P | |
1356 | (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (type)))))) | |
a1ab4c31 AC |
1357 | rest_of_type_decl_compilation (type_decl); |
1358 | ||
1359 | return type_decl; | |
1360 | } | |
10069d53 | 1361 | \f |
a1ab4c31 AC |
1362 | /* Return a VAR_DECL or CONST_DECL node. |
1363 | ||
1364 | VAR_NAME gives the name of the variable. ASM_NAME is its assembler name | |
1365 | (if provided). TYPE is its data type (a GCC ..._TYPE node). VAR_INIT is | |
1366 | the GCC tree for an optional initial expression; NULL_TREE if none. | |
1367 | ||
1368 | CONST_FLAG is true if this variable is constant, in which case we might | |
1369 | return a CONST_DECL node unless CONST_DECL_ALLOWED_P is false. | |
1370 | ||
1371 | PUBLIC_FLAG is true if this is for a reference to a public entity or for a | |
1372 | definition to be made visible outside of the current compilation unit, for | |
1373 | instance variable definitions in a package specification. | |
1374 | ||
1e17ef87 | 1375 | EXTERN_FLAG is true when processing an external variable declaration (as |
a1ab4c31 AC |
1376 | opposed to a definition: no storage is to be allocated for the variable). |
1377 | ||
1378 | STATIC_FLAG is only relevant when not at top level. In that case | |
1379 | it indicates whether to always allocate storage to the variable. | |
1380 | ||
1381 | GNAT_NODE is used for the position of the decl. */ | |
1382 | ||
1383 | tree | |
1384 | create_var_decl_1 (tree var_name, tree asm_name, tree type, tree var_init, | |
1385 | bool const_flag, bool public_flag, bool extern_flag, | |
1386 | bool static_flag, bool const_decl_allowed_p, | |
1387 | struct attrib *attr_list, Node_Id gnat_node) | |
1388 | { | |
1389 | bool init_const | |
1390 | = (var_init != 0 | |
1391 | && gnat_types_compatible_p (type, TREE_TYPE (var_init)) | |
1392 | && (global_bindings_p () || static_flag | |
1393 | ? initializer_constant_valid_p (var_init, TREE_TYPE (var_init)) != 0 | |
1394 | : TREE_CONSTANT (var_init))); | |
1395 | ||
1396 | /* Whether we will make TREE_CONSTANT the DECL we produce here, in which | |
1397 | case the initializer may be used in-lieu of the DECL node (as done in | |
1398 | Identifier_to_gnu). This is useful to prevent the need of elaboration | |
1399 | code when an identifier for which such a decl is made is in turn used as | |
1400 | an initializer. We used to rely on CONST vs VAR_DECL for this purpose, | |
1401 | but extra constraints apply to this choice (see below) and are not | |
1402 | relevant to the distinction we wish to make. */ | |
1403 | bool constant_p = const_flag && init_const; | |
1404 | ||
1405 | /* The actual DECL node. CONST_DECL was initially intended for enumerals | |
1406 | and may be used for scalars in general but not for aggregates. */ | |
1407 | tree var_decl | |
c172df28 AH |
1408 | = build_decl (input_location, |
1409 | (constant_p && const_decl_allowed_p | |
a1ab4c31 AC |
1410 | && !AGGREGATE_TYPE_P (type)) ? CONST_DECL : VAR_DECL, |
1411 | var_name, type); | |
1412 | ||
1413 | /* If this is external, throw away any initializations (they will be done | |
1414 | elsewhere) unless this is a constant for which we would like to remain | |
1415 | able to get the initializer. If we are defining a global here, leave a | |
1416 | constant initialization and save any variable elaborations for the | |
1417 | elaboration routine. If we are just annotating types, throw away the | |
1418 | initialization if it isn't a constant. */ | |
1419 | if ((extern_flag && !constant_p) | |
1420 | || (type_annotate_only && var_init && !TREE_CONSTANT (var_init))) | |
1421 | var_init = NULL_TREE; | |
1422 | ||
1423 | /* At the global level, an initializer requiring code to be generated | |
1424 | produces elaboration statements. Check that such statements are allowed, | |
1425 | that is, not violating a No_Elaboration_Code restriction. */ | |
3b9e8343 | 1426 | if (global_bindings_p () && var_init != 0 && !init_const) |
a1ab4c31 | 1427 | Check_Elaboration_Code_Allowed (gnat_node); |
3b9e8343 | 1428 | |
8b7b0c36 JH |
1429 | DECL_INITIAL (var_decl) = var_init; |
1430 | TREE_READONLY (var_decl) = const_flag; | |
1431 | DECL_EXTERNAL (var_decl) = extern_flag; | |
1432 | TREE_PUBLIC (var_decl) = public_flag || extern_flag; | |
1433 | TREE_CONSTANT (var_decl) = constant_p; | |
1434 | TREE_THIS_VOLATILE (var_decl) = TREE_SIDE_EFFECTS (var_decl) | |
1435 | = TYPE_VOLATILE (type); | |
a1ab4c31 AC |
1436 | |
1437 | /* Ada doesn't feature Fortran-like COMMON variables so we shouldn't | |
1438 | try to fiddle with DECL_COMMON. However, on platforms that don't | |
1439 | support global BSS sections, uninitialized global variables would | |
1440 | go in DATA instead, thus increasing the size of the executable. */ | |
1441 | if (!flag_no_common | |
1442 | && TREE_CODE (var_decl) == VAR_DECL | |
3b9e8343 | 1443 | && TREE_PUBLIC (var_decl) |
a1ab4c31 AC |
1444 | && !have_global_bss_p ()) |
1445 | DECL_COMMON (var_decl) = 1; | |
a1ab4c31 | 1446 | |
2231f17f EB |
1447 | /* At the global binding level, we need to allocate static storage for the |
1448 | variable if it isn't external. Otherwise, we allocate automatic storage | |
1449 | unless requested not to. */ | |
a1ab4c31 | 1450 | TREE_STATIC (var_decl) |
2231f17f | 1451 | = !extern_flag && (static_flag || global_bindings_p ()); |
a1ab4c31 | 1452 | |
5225a138 EB |
1453 | /* For an external constant whose initializer is not absolute, do not emit |
1454 | debug info. In DWARF this would mean a global relocation in a read-only | |
c01fe451 | 1455 | section which runs afoul of the PE-COFF run-time relocation mechanism. */ |
5225a138 EB |
1456 | if (extern_flag |
1457 | && constant_p | |
1458 | && initializer_constant_valid_p (var_init, TREE_TYPE (var_init)) | |
1459 | != null_pointer_node) | |
1460 | DECL_IGNORED_P (var_decl) = 1; | |
1461 | ||
a1ab4c31 AC |
1462 | /* Add this decl to the current binding level. */ |
1463 | gnat_pushdecl (var_decl, gnat_node); | |
1464 | ||
1465 | if (TREE_SIDE_EFFECTS (var_decl)) | |
1466 | TREE_ADDRESSABLE (var_decl) = 1; | |
1467 | ||
58c8f770 | 1468 | if (TREE_CODE (var_decl) == VAR_DECL) |
a1ab4c31 | 1469 | { |
58c8f770 EB |
1470 | if (asm_name) |
1471 | SET_DECL_ASSEMBLER_NAME (var_decl, asm_name); | |
1472 | process_attributes (var_decl, attr_list); | |
a1ab4c31 AC |
1473 | if (global_bindings_p ()) |
1474 | rest_of_decl_compilation (var_decl, true, 0); | |
1475 | } | |
1476 | else | |
1477 | expand_decl (var_decl); | |
1478 | ||
1479 | return var_decl; | |
1480 | } | |
1481 | \f | |
1482 | /* Return true if TYPE, an aggregate type, contains (or is) an array. */ | |
1483 | ||
1484 | static bool | |
1485 | aggregate_type_contains_array_p (tree type) | |
1486 | { | |
1487 | switch (TREE_CODE (type)) | |
1488 | { | |
1489 | case RECORD_TYPE: | |
1490 | case UNION_TYPE: | |
1491 | case QUAL_UNION_TYPE: | |
1492 | { | |
1493 | tree field; | |
910ad8de | 1494 | for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) |
a1ab4c31 AC |
1495 | if (AGGREGATE_TYPE_P (TREE_TYPE (field)) |
1496 | && aggregate_type_contains_array_p (TREE_TYPE (field))) | |
1497 | return true; | |
1498 | return false; | |
1499 | } | |
1500 | ||
1501 | case ARRAY_TYPE: | |
1502 | return true; | |
1503 | ||
1504 | default: | |
1505 | gcc_unreachable (); | |
1506 | } | |
1507 | } | |
1508 | ||
62f9f3ce | 1509 | /* Return a FIELD_DECL node. FIELD_NAME is the field's name, FIELD_TYPE is |
da01bfee EB |
1510 | its type and RECORD_TYPE is the type of the enclosing record. If SIZE is |
1511 | nonzero, it is the specified size of the field. If POS is nonzero, it is | |
1512 | the bit position. PACKED is 1 if the enclosing record is packed, -1 if it | |
1513 | has Component_Alignment of Storage_Unit. If ADDRESSABLE is nonzero, it | |
62f9f3ce EB |
1514 | means we are allowed to take the address of the field; if it is negative, |
1515 | we should not make a bitfield, which is used by make_aligning_type. */ | |
a1ab4c31 AC |
1516 | |
1517 | tree | |
1518 | create_field_decl (tree field_name, tree field_type, tree record_type, | |
da01bfee | 1519 | tree size, tree pos, int packed, int addressable) |
a1ab4c31 | 1520 | { |
c172df28 AH |
1521 | tree field_decl = build_decl (input_location, |
1522 | FIELD_DECL, field_name, field_type); | |
a1ab4c31 AC |
1523 | |
1524 | DECL_CONTEXT (field_decl) = record_type; | |
1525 | TREE_READONLY (field_decl) = TYPE_READONLY (field_type); | |
1526 | ||
1527 | /* If FIELD_TYPE is BLKmode, we must ensure this is aligned to at least a | |
1528 | byte boundary since GCC cannot handle less-aligned BLKmode bitfields. | |
1529 | Likewise for an aggregate without specified position that contains an | |
1530 | array, because in this case slices of variable length of this array | |
1531 | must be handled by GCC and variable-sized objects need to be aligned | |
1532 | to at least a byte boundary. */ | |
1533 | if (packed && (TYPE_MODE (field_type) == BLKmode | |
1534 | || (!pos | |
1535 | && AGGREGATE_TYPE_P (field_type) | |
1536 | && aggregate_type_contains_array_p (field_type)))) | |
1537 | DECL_ALIGN (field_decl) = BITS_PER_UNIT; | |
1538 | ||
1539 | /* If a size is specified, use it. Otherwise, if the record type is packed | |
1540 | compute a size to use, which may differ from the object's natural size. | |
1541 | We always set a size in this case to trigger the checks for bitfield | |
1542 | creation below, which is typically required when no position has been | |
1543 | specified. */ | |
1544 | if (size) | |
1545 | size = convert (bitsizetype, size); | |
1546 | else if (packed == 1) | |
1547 | { | |
1548 | size = rm_size (field_type); | |
62f9f3ce EB |
1549 | if (TYPE_MODE (field_type) == BLKmode) |
1550 | size = round_up (size, BITS_PER_UNIT); | |
a1ab4c31 AC |
1551 | } |
1552 | ||
1553 | /* If we may, according to ADDRESSABLE, make a bitfield if a size is | |
1554 | specified for two reasons: first if the size differs from the natural | |
1555 | size. Second, if the alignment is insufficient. There are a number of | |
1556 | ways the latter can be true. | |
1557 | ||
1558 | We never make a bitfield if the type of the field has a nonconstant size, | |
1559 | because no such entity requiring bitfield operations should reach here. | |
1560 | ||
1561 | We do *preventively* make a bitfield when there might be the need for it | |
1562 | but we don't have all the necessary information to decide, as is the case | |
1563 | of a field with no specified position in a packed record. | |
1564 | ||
1565 | We also don't look at STRICT_ALIGNMENT here, and rely on later processing | |
1566 | in layout_decl or finish_record_type to clear the bit_field indication if | |
1567 | it is in fact not needed. */ | |
1568 | if (addressable >= 0 | |
1569 | && size | |
1570 | && TREE_CODE (size) == INTEGER_CST | |
1571 | && TREE_CODE (TYPE_SIZE (field_type)) == INTEGER_CST | |
1572 | && (!tree_int_cst_equal (size, TYPE_SIZE (field_type)) | |
1573 | || (pos && !value_factor_p (pos, TYPE_ALIGN (field_type))) | |
1574 | || packed | |
1575 | || (TYPE_ALIGN (record_type) != 0 | |
1576 | && TYPE_ALIGN (record_type) < TYPE_ALIGN (field_type)))) | |
1577 | { | |
1578 | DECL_BIT_FIELD (field_decl) = 1; | |
1579 | DECL_SIZE (field_decl) = size; | |
1580 | if (!packed && !pos) | |
feec4372 EB |
1581 | { |
1582 | if (TYPE_ALIGN (record_type) != 0 | |
1583 | && TYPE_ALIGN (record_type) < TYPE_ALIGN (field_type)) | |
1584 | DECL_ALIGN (field_decl) = TYPE_ALIGN (record_type); | |
1585 | else | |
1586 | DECL_ALIGN (field_decl) = TYPE_ALIGN (field_type); | |
1587 | } | |
a1ab4c31 AC |
1588 | } |
1589 | ||
1590 | DECL_PACKED (field_decl) = pos ? DECL_BIT_FIELD (field_decl) : packed; | |
1591 | ||
1592 | /* Bump the alignment if need be, either for bitfield/packing purposes or | |
1593 | to satisfy the type requirements if no such consideration applies. When | |
1594 | we get the alignment from the type, indicate if this is from an explicit | |
1595 | user request, which prevents stor-layout from lowering it later on. */ | |
1596 | { | |
d9223014 | 1597 | unsigned int bit_align |
a1ab4c31 AC |
1598 | = (DECL_BIT_FIELD (field_decl) ? 1 |
1599 | : packed && TYPE_MODE (field_type) != BLKmode ? BITS_PER_UNIT : 0); | |
1600 | ||
1601 | if (bit_align > DECL_ALIGN (field_decl)) | |
1602 | DECL_ALIGN (field_decl) = bit_align; | |
1603 | else if (!bit_align && TYPE_ALIGN (field_type) > DECL_ALIGN (field_decl)) | |
1604 | { | |
1605 | DECL_ALIGN (field_decl) = TYPE_ALIGN (field_type); | |
1606 | DECL_USER_ALIGN (field_decl) = TYPE_USER_ALIGN (field_type); | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | if (pos) | |
1611 | { | |
1612 | /* We need to pass in the alignment the DECL is known to have. | |
1613 | This is the lowest-order bit set in POS, but no more than | |
1614 | the alignment of the record, if one is specified. Note | |
1615 | that an alignment of 0 is taken as infinite. */ | |
1616 | unsigned int known_align; | |
1617 | ||
1618 | if (host_integerp (pos, 1)) | |
1619 | known_align = tree_low_cst (pos, 1) & - tree_low_cst (pos, 1); | |
1620 | else | |
1621 | known_align = BITS_PER_UNIT; | |
1622 | ||
1623 | if (TYPE_ALIGN (record_type) | |
1624 | && (known_align == 0 || known_align > TYPE_ALIGN (record_type))) | |
1625 | known_align = TYPE_ALIGN (record_type); | |
1626 | ||
1627 | layout_decl (field_decl, known_align); | |
1628 | SET_DECL_OFFSET_ALIGN (field_decl, | |
1629 | host_integerp (pos, 1) ? BIGGEST_ALIGNMENT | |
1630 | : BITS_PER_UNIT); | |
1631 | pos_from_bit (&DECL_FIELD_OFFSET (field_decl), | |
1632 | &DECL_FIELD_BIT_OFFSET (field_decl), | |
1633 | DECL_OFFSET_ALIGN (field_decl), pos); | |
a1ab4c31 AC |
1634 | } |
1635 | ||
1636 | /* In addition to what our caller says, claim the field is addressable if we | |
1637 | know that its type is not suitable. | |
1638 | ||
1639 | The field may also be "technically" nonaddressable, meaning that even if | |
1640 | we attempt to take the field's address we will actually get the address | |
1641 | of a copy. This is the case for true bitfields, but the DECL_BIT_FIELD | |
1642 | value we have at this point is not accurate enough, so we don't account | |
1643 | for this here and let finish_record_type decide. */ | |
4c5a0615 | 1644 | if (!addressable && !type_for_nonaliased_component_p (field_type)) |
a1ab4c31 AC |
1645 | addressable = 1; |
1646 | ||
1647 | DECL_NONADDRESSABLE_P (field_decl) = !addressable; | |
1648 | ||
1649 | return field_decl; | |
1650 | } | |
1651 | \f | |
a8e05f92 EB |
1652 | /* Return a PARM_DECL node. PARAM_NAME is the name of the parameter and |
1653 | PARAM_TYPE is its type. READONLY is true if the parameter is readonly | |
1654 | (either an In parameter or an address of a pass-by-ref parameter). */ | |
a1ab4c31 AC |
1655 | |
1656 | tree | |
1657 | create_param_decl (tree param_name, tree param_type, bool readonly) | |
1658 | { | |
c172df28 AH |
1659 | tree param_decl = build_decl (input_location, |
1660 | PARM_DECL, param_name, param_type); | |
a1ab4c31 | 1661 | |
a8e05f92 EB |
1662 | /* Honor TARGET_PROMOTE_PROTOTYPES like the C compiler, as not doing so |
1663 | can lead to various ABI violations. */ | |
1664 | if (targetm.calls.promote_prototypes (NULL_TREE) | |
1665 | && INTEGRAL_TYPE_P (param_type) | |
a1ab4c31 AC |
1666 | && TYPE_PRECISION (param_type) < TYPE_PRECISION (integer_type_node)) |
1667 | { | |
1668 | /* We have to be careful about biased types here. Make a subtype | |
1669 | of integer_type_node with the proper biasing. */ | |
1670 | if (TREE_CODE (param_type) == INTEGER_TYPE | |
1671 | && TYPE_BIASED_REPRESENTATION_P (param_type)) | |
1672 | { | |
84fb43a1 EB |
1673 | tree subtype |
1674 | = make_unsigned_type (TYPE_PRECISION (integer_type_node)); | |
c1abd261 EB |
1675 | TREE_TYPE (subtype) = integer_type_node; |
1676 | TYPE_BIASED_REPRESENTATION_P (subtype) = 1; | |
84fb43a1 EB |
1677 | SET_TYPE_RM_MIN_VALUE (subtype, TYPE_MIN_VALUE (param_type)); |
1678 | SET_TYPE_RM_MAX_VALUE (subtype, TYPE_MAX_VALUE (param_type)); | |
c1abd261 | 1679 | param_type = subtype; |
a1ab4c31 AC |
1680 | } |
1681 | else | |
1682 | param_type = integer_type_node; | |
1683 | } | |
1684 | ||
1685 | DECL_ARG_TYPE (param_decl) = param_type; | |
1686 | TREE_READONLY (param_decl) = readonly; | |
1687 | return param_decl; | |
1688 | } | |
1689 | \f | |
1690 | /* Given a DECL and ATTR_LIST, process the listed attributes. */ | |
1691 | ||
58c8f770 | 1692 | static void |
a1ab4c31 AC |
1693 | process_attributes (tree decl, struct attrib *attr_list) |
1694 | { | |
1695 | for (; attr_list; attr_list = attr_list->next) | |
1696 | switch (attr_list->type) | |
1697 | { | |
1698 | case ATTR_MACHINE_ATTRIBUTE: | |
58c8f770 | 1699 | input_location = DECL_SOURCE_LOCATION (decl); |
a1ab4c31 AC |
1700 | decl_attributes (&decl, tree_cons (attr_list->name, attr_list->args, |
1701 | NULL_TREE), | |
1702 | ATTR_FLAG_TYPE_IN_PLACE); | |
1703 | break; | |
1704 | ||
1705 | case ATTR_LINK_ALIAS: | |
1706 | if (! DECL_EXTERNAL (decl)) | |
1707 | { | |
1708 | TREE_STATIC (decl) = 1; | |
1709 | assemble_alias (decl, attr_list->name); | |
1710 | } | |
1711 | break; | |
1712 | ||
1713 | case ATTR_WEAK_EXTERNAL: | |
1714 | if (SUPPORTS_WEAK) | |
1715 | declare_weak (decl); | |
1716 | else | |
1717 | post_error ("?weak declarations not supported on this target", | |
1718 | attr_list->error_point); | |
1719 | break; | |
1720 | ||
1721 | case ATTR_LINK_SECTION: | |
1722 | if (targetm.have_named_sections) | |
1723 | { | |
1724 | DECL_SECTION_NAME (decl) | |
1725 | = build_string (IDENTIFIER_LENGTH (attr_list->name), | |
1726 | IDENTIFIER_POINTER (attr_list->name)); | |
1727 | DECL_COMMON (decl) = 0; | |
1728 | } | |
1729 | else | |
1730 | post_error ("?section attributes are not supported for this target", | |
1731 | attr_list->error_point); | |
1732 | break; | |
1733 | ||
1734 | case ATTR_LINK_CONSTRUCTOR: | |
1735 | DECL_STATIC_CONSTRUCTOR (decl) = 1; | |
1736 | TREE_USED (decl) = 1; | |
1737 | break; | |
1738 | ||
1739 | case ATTR_LINK_DESTRUCTOR: | |
1740 | DECL_STATIC_DESTRUCTOR (decl) = 1; | |
1741 | TREE_USED (decl) = 1; | |
1742 | break; | |
40a14772 TG |
1743 | |
1744 | case ATTR_THREAD_LOCAL_STORAGE: | |
62298c61 TG |
1745 | DECL_TLS_MODEL (decl) = decl_default_tls_model (decl); |
1746 | DECL_COMMON (decl) = 0; | |
40a14772 | 1747 | break; |
a1ab4c31 AC |
1748 | } |
1749 | } | |
1750 | \f | |
feec4372 | 1751 | /* Record DECL as a global renaming pointer. */ |
a1ab4c31 AC |
1752 | |
1753 | void | |
1754 | record_global_renaming_pointer (tree decl) | |
1755 | { | |
1756 | gcc_assert (DECL_RENAMED_OBJECT (decl)); | |
1757 | VEC_safe_push (tree, gc, global_renaming_pointers, decl); | |
1758 | } | |
1759 | ||
1760 | /* Invalidate the global renaming pointers. */ | |
1761 | ||
1762 | void | |
1763 | invalidate_global_renaming_pointers (void) | |
1764 | { | |
1765 | unsigned int i; | |
1766 | tree iter; | |
1767 | ||
ac47786e | 1768 | FOR_EACH_VEC_ELT (tree, global_renaming_pointers, i, iter) |
a1ab4c31 AC |
1769 | SET_DECL_RENAMED_OBJECT (iter, NULL_TREE); |
1770 | ||
1771 | VEC_free (tree, gc, global_renaming_pointers); | |
1772 | } | |
1773 | ||
1774 | /* Return true if VALUE is a known to be a multiple of FACTOR, which must be | |
1775 | a power of 2. */ | |
1776 | ||
1777 | bool | |
1778 | value_factor_p (tree value, HOST_WIDE_INT factor) | |
1779 | { | |
1780 | if (host_integerp (value, 1)) | |
1781 | return tree_low_cst (value, 1) % factor == 0; | |
1782 | ||
1783 | if (TREE_CODE (value) == MULT_EXPR) | |
1784 | return (value_factor_p (TREE_OPERAND (value, 0), factor) | |
1785 | || value_factor_p (TREE_OPERAND (value, 1), factor)); | |
1786 | ||
1787 | return false; | |
1788 | } | |
1789 | ||
7d7fcb08 | 1790 | /* Given two consecutive field decls PREV_FIELD and CURR_FIELD, return true |
a1ab4c31 AC |
1791 | unless we can prove these 2 fields are laid out in such a way that no gap |
1792 | exist between the end of PREV_FIELD and the beginning of CURR_FIELD. OFFSET | |
1793 | is the distance in bits between the end of PREV_FIELD and the starting | |
1794 | position of CURR_FIELD. It is ignored if null. */ | |
1795 | ||
1796 | static bool | |
1797 | potential_alignment_gap (tree prev_field, tree curr_field, tree offset) | |
1798 | { | |
1799 | /* If this is the first field of the record, there cannot be any gap */ | |
1800 | if (!prev_field) | |
1801 | return false; | |
1802 | ||
1803 | /* If the previous field is a union type, then return False: The only | |
1804 | time when such a field is not the last field of the record is when | |
1805 | there are other components at fixed positions after it (meaning there | |
1806 | was a rep clause for every field), in which case we don't want the | |
1807 | alignment constraint to override them. */ | |
1808 | if (TREE_CODE (TREE_TYPE (prev_field)) == QUAL_UNION_TYPE) | |
1809 | return false; | |
1810 | ||
1811 | /* If the distance between the end of prev_field and the beginning of | |
1812 | curr_field is constant, then there is a gap if the value of this | |
1813 | constant is not null. */ | |
1814 | if (offset && host_integerp (offset, 1)) | |
1815 | return !integer_zerop (offset); | |
1816 | ||
1817 | /* If the size and position of the previous field are constant, | |
1818 | then check the sum of this size and position. There will be a gap | |
1819 | iff it is not multiple of the current field alignment. */ | |
1820 | if (host_integerp (DECL_SIZE (prev_field), 1) | |
1821 | && host_integerp (bit_position (prev_field), 1)) | |
1822 | return ((tree_low_cst (bit_position (prev_field), 1) | |
1823 | + tree_low_cst (DECL_SIZE (prev_field), 1)) | |
1824 | % DECL_ALIGN (curr_field) != 0); | |
1825 | ||
1826 | /* If both the position and size of the previous field are multiples | |
1827 | of the current field alignment, there cannot be any gap. */ | |
1828 | if (value_factor_p (bit_position (prev_field), DECL_ALIGN (curr_field)) | |
1829 | && value_factor_p (DECL_SIZE (prev_field), DECL_ALIGN (curr_field))) | |
1830 | return false; | |
1831 | ||
1832 | /* Fallback, return that there may be a potential gap */ | |
1833 | return true; | |
1834 | } | |
1835 | ||
7d7fcb08 | 1836 | /* Return a LABEL_DECL node for LABEL_NAME. */ |
a1ab4c31 AC |
1837 | |
1838 | tree | |
1839 | create_label_decl (tree label_name) | |
1840 | { | |
c172df28 AH |
1841 | tree label_decl = build_decl (input_location, |
1842 | LABEL_DECL, label_name, void_type_node); | |
a1ab4c31 AC |
1843 | |
1844 | DECL_CONTEXT (label_decl) = current_function_decl; | |
1845 | DECL_MODE (label_decl) = VOIDmode; | |
1846 | DECL_SOURCE_LOCATION (label_decl) = input_location; | |
1847 | ||
1848 | return label_decl; | |
1849 | } | |
1850 | \f | |
7d7fcb08 | 1851 | /* Return a FUNCTION_DECL node. SUBPROG_NAME is the name of the subprogram, |
a1ab4c31 AC |
1852 | ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE |
1853 | node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of | |
1854 | PARM_DECL nodes chained through the TREE_CHAIN field). | |
1855 | ||
7d7fcb08 EB |
1856 | INLINE_FLAG, PUBLIC_FLAG, EXTERN_FLAG, ARTIFICIAL_FLAG and ATTR_LIST are |
1857 | used to set the appropriate fields in the FUNCTION_DECL. GNAT_NODE is | |
1858 | used for the position of the decl. */ | |
a1ab4c31 AC |
1859 | |
1860 | tree | |
7d7fcb08 EB |
1861 | create_subprog_decl (tree subprog_name, tree asm_name, tree subprog_type, |
1862 | tree param_decl_list, bool inline_flag, bool public_flag, | |
1863 | bool extern_flag, bool artificial_flag, | |
1864 | struct attrib *attr_list, Node_Id gnat_node) | |
a1ab4c31 | 1865 | { |
d47d0a8d EB |
1866 | tree subprog_decl = build_decl (input_location, FUNCTION_DECL, subprog_name, |
1867 | subprog_type); | |
1868 | tree result_decl = build_decl (input_location, RESULT_DECL, NULL_TREE, | |
1869 | TREE_TYPE (subprog_type)); | |
7d7fcb08 | 1870 | DECL_ARGUMENTS (subprog_decl) = param_decl_list; |
a1ab4c31 | 1871 | |
d84b344a EB |
1872 | /* If this is a non-inline function nested inside an inlined external |
1873 | function, we cannot honor both requests without cloning the nested | |
1874 | function in the current unit since it is private to the other unit. | |
1875 | We could inline the nested function as well but it's probably better | |
1876 | to err on the side of too little inlining. */ | |
1877 | if (!inline_flag | |
5daed84a | 1878 | && !public_flag |
d84b344a EB |
1879 | && current_function_decl |
1880 | && DECL_DECLARED_INLINE_P (current_function_decl) | |
a1ab4c31 | 1881 | && DECL_EXTERNAL (current_function_decl)) |
d84b344a | 1882 | DECL_DECLARED_INLINE_P (current_function_decl) = 0; |
a1ab4c31 | 1883 | |
7d7fcb08 EB |
1884 | DECL_ARTIFICIAL (subprog_decl) = artificial_flag; |
1885 | DECL_EXTERNAL (subprog_decl) = extern_flag; | |
1886 | DECL_DECLARED_INLINE_P (subprog_decl) = inline_flag; | |
1887 | DECL_NO_INLINE_WARNING_P (subprog_decl) = inline_flag && artificial_flag; | |
1888 | ||
1889 | TREE_PUBLIC (subprog_decl) = public_flag; | |
1890 | TREE_READONLY (subprog_decl) = TYPE_READONLY (subprog_type); | |
a1ab4c31 AC |
1891 | TREE_THIS_VOLATILE (subprog_decl) = TYPE_VOLATILE (subprog_type); |
1892 | TREE_SIDE_EFFECTS (subprog_decl) = TYPE_VOLATILE (subprog_type); | |
a1ab4c31 | 1893 | |
d47d0a8d EB |
1894 | DECL_ARTIFICIAL (result_decl) = 1; |
1895 | DECL_IGNORED_P (result_decl) = 1; | |
1896 | DECL_BY_REFERENCE (result_decl) = TREE_ADDRESSABLE (subprog_type); | |
1897 | DECL_RESULT (subprog_decl) = result_decl; | |
a1ab4c31 | 1898 | |
a1ab4c31 AC |
1899 | if (asm_name) |
1900 | { | |
1901 | SET_DECL_ASSEMBLER_NAME (subprog_decl, asm_name); | |
1902 | ||
1903 | /* The expand_main_function circuitry expects "main_identifier_node" to | |
1904 | designate the DECL_NAME of the 'main' entry point, in turn expected | |
1905 | to be declared as the "main" function literally by default. Ada | |
1906 | program entry points are typically declared with a different name | |
1907 | within the binder generated file, exported as 'main' to satisfy the | |
cfbb663c | 1908 | system expectations. Force main_identifier_node in this case. */ |
a1ab4c31 | 1909 | if (asm_name == main_identifier_node) |
cfbb663c | 1910 | DECL_NAME (subprog_decl) = main_identifier_node; |
a1ab4c31 AC |
1911 | } |
1912 | ||
a1ab4c31 AC |
1913 | /* Add this decl to the current binding level. */ |
1914 | gnat_pushdecl (subprog_decl, gnat_node); | |
1915 | ||
58c8f770 EB |
1916 | process_attributes (subprog_decl, attr_list); |
1917 | ||
a1ab4c31 AC |
1918 | /* Output the assembler code and/or RTL for the declaration. */ |
1919 | rest_of_decl_compilation (subprog_decl, global_bindings_p (), 0); | |
1920 | ||
1921 | return subprog_decl; | |
1922 | } | |
1923 | \f | |
1924 | /* Set up the framework for generating code for SUBPROG_DECL, a subprogram | |
1925 | body. This routine needs to be invoked before processing the declarations | |
1926 | appearing in the subprogram. */ | |
1927 | ||
1928 | void | |
1929 | begin_subprog_body (tree subprog_decl) | |
1930 | { | |
1931 | tree param_decl; | |
1932 | ||
a1ab4c31 AC |
1933 | announce_function (subprog_decl); |
1934 | ||
0ae44446 JR |
1935 | /* This function is being defined. */ |
1936 | TREE_STATIC (subprog_decl) = 1; | |
1937 | ||
58c8f770 EB |
1938 | current_function_decl = subprog_decl; |
1939 | ||
a1ab4c31 AC |
1940 | /* Enter a new binding level and show that all the parameters belong to |
1941 | this function. */ | |
1942 | gnat_pushlevel (); | |
a09d56d8 | 1943 | |
a1ab4c31 | 1944 | for (param_decl = DECL_ARGUMENTS (subprog_decl); param_decl; |
910ad8de | 1945 | param_decl = DECL_CHAIN (param_decl)) |
a1ab4c31 AC |
1946 | DECL_CONTEXT (param_decl) = subprog_decl; |
1947 | ||
1948 | make_decl_rtl (subprog_decl); | |
a1ab4c31 AC |
1949 | } |
1950 | ||
2fa03086 | 1951 | /* Finish the definition of the current subprogram BODY and finalize it. */ |
a1ab4c31 AC |
1952 | |
1953 | void | |
a406865a | 1954 | end_subprog_body (tree body) |
a1ab4c31 AC |
1955 | { |
1956 | tree fndecl = current_function_decl; | |
1957 | ||
bd9c7fb9 | 1958 | /* Attach the BLOCK for this level to the function and pop the level. */ |
a1ab4c31 AC |
1959 | BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl; |
1960 | DECL_INITIAL (fndecl) = current_binding_level->block; | |
1961 | gnat_poplevel (); | |
1962 | ||
a1ab4c31 AC |
1963 | /* Mark the RESULT_DECL as being in this subprogram. */ |
1964 | DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; | |
1965 | ||
a963da4d EB |
1966 | /* The body should be a BIND_EXPR whose BLOCK is the top-level one. */ |
1967 | if (TREE_CODE (body) == BIND_EXPR) | |
1968 | { | |
1969 | BLOCK_SUPERCONTEXT (BIND_EXPR_BLOCK (body)) = fndecl; | |
1970 | DECL_INITIAL (fndecl) = BIND_EXPR_BLOCK (body); | |
1971 | } | |
1972 | ||
a1ab4c31 AC |
1973 | DECL_SAVED_TREE (fndecl) = body; |
1974 | ||
1975 | current_function_decl = DECL_CONTEXT (fndecl); | |
a1ab4c31 AC |
1976 | |
1977 | /* We cannot track the location of errors past this point. */ | |
1978 | error_gnat_node = Empty; | |
1979 | ||
1980 | /* If we're only annotating types, don't actually compile this function. */ | |
1981 | if (type_annotate_only) | |
1982 | return; | |
1983 | ||
a406865a RG |
1984 | /* Dump functions before gimplification. */ |
1985 | dump_function (TDI_original, fndecl); | |
1986 | ||
2fa03086 | 1987 | /* ??? This special handling of nested functions is probably obsolete. */ |
a1ab4c31 | 1988 | if (!DECL_CONTEXT (fndecl)) |
a406865a | 1989 | cgraph_finalize_function (fndecl, false); |
a1ab4c31 AC |
1990 | else |
1991 | /* Register this function with cgraph just far enough to get it | |
1992 | added to our parent's nested function list. */ | |
a358e188 | 1993 | (void) cgraph_get_create_node (fndecl); |
a1ab4c31 AC |
1994 | } |
1995 | ||
a1ab4c31 AC |
1996 | tree |
1997 | gnat_builtin_function (tree decl) | |
1998 | { | |
1999 | gnat_pushdecl (decl, Empty); | |
2000 | return decl; | |
2001 | } | |
2002 | ||
2003 | /* Return an integer type with the number of bits of precision given by | |
2004 | PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise | |
2005 | it is a signed type. */ | |
2006 | ||
2007 | tree | |
2008 | gnat_type_for_size (unsigned precision, int unsignedp) | |
2009 | { | |
2010 | tree t; | |
2011 | char type_name[20]; | |
2012 | ||
2013 | if (precision <= 2 * MAX_BITS_PER_WORD | |
2014 | && signed_and_unsigned_types[precision][unsignedp]) | |
2015 | return signed_and_unsigned_types[precision][unsignedp]; | |
2016 | ||
2017 | if (unsignedp) | |
2018 | t = make_unsigned_type (precision); | |
2019 | else | |
2020 | t = make_signed_type (precision); | |
2021 | ||
2022 | if (precision <= 2 * MAX_BITS_PER_WORD) | |
2023 | signed_and_unsigned_types[precision][unsignedp] = t; | |
2024 | ||
2025 | if (!TYPE_NAME (t)) | |
2026 | { | |
2027 | sprintf (type_name, "%sSIGNED_%d", unsignedp ? "UN" : "", precision); | |
2028 | TYPE_NAME (t) = get_identifier (type_name); | |
2029 | } | |
2030 | ||
2031 | return t; | |
2032 | } | |
2033 | ||
2034 | /* Likewise for floating-point types. */ | |
2035 | ||
2036 | static tree | |
2037 | float_type_for_precision (int precision, enum machine_mode mode) | |
2038 | { | |
2039 | tree t; | |
2040 | char type_name[20]; | |
2041 | ||
2042 | if (float_types[(int) mode]) | |
2043 | return float_types[(int) mode]; | |
2044 | ||
2045 | float_types[(int) mode] = t = make_node (REAL_TYPE); | |
2046 | TYPE_PRECISION (t) = precision; | |
2047 | layout_type (t); | |
2048 | ||
2049 | gcc_assert (TYPE_MODE (t) == mode); | |
2050 | if (!TYPE_NAME (t)) | |
2051 | { | |
2052 | sprintf (type_name, "FLOAT_%d", precision); | |
2053 | TYPE_NAME (t) = get_identifier (type_name); | |
2054 | } | |
2055 | ||
2056 | return t; | |
2057 | } | |
2058 | ||
2059 | /* Return a data type that has machine mode MODE. UNSIGNEDP selects | |
2060 | an unsigned type; otherwise a signed type is returned. */ | |
2061 | ||
2062 | tree | |
2063 | gnat_type_for_mode (enum machine_mode mode, int unsignedp) | |
2064 | { | |
2065 | if (mode == BLKmode) | |
2066 | return NULL_TREE; | |
2799d18c EB |
2067 | |
2068 | if (mode == VOIDmode) | |
a1ab4c31 | 2069 | return void_type_node; |
2799d18c EB |
2070 | |
2071 | if (COMPLEX_MODE_P (mode)) | |
a1ab4c31 | 2072 | return NULL_TREE; |
2799d18c EB |
2073 | |
2074 | if (SCALAR_FLOAT_MODE_P (mode)) | |
a1ab4c31 | 2075 | return float_type_for_precision (GET_MODE_PRECISION (mode), mode); |
2799d18c EB |
2076 | |
2077 | if (SCALAR_INT_MODE_P (mode)) | |
a1ab4c31 | 2078 | return gnat_type_for_size (GET_MODE_BITSIZE (mode), unsignedp); |
2799d18c EB |
2079 | |
2080 | if (VECTOR_MODE_P (mode)) | |
2081 | { | |
2082 | enum machine_mode inner_mode = GET_MODE_INNER (mode); | |
2083 | tree inner_type = gnat_type_for_mode (inner_mode, unsignedp); | |
2084 | if (inner_type) | |
2085 | return build_vector_type_for_mode (inner_type, mode); | |
2086 | } | |
2087 | ||
2088 | return NULL_TREE; | |
a1ab4c31 AC |
2089 | } |
2090 | ||
2091 | /* Return the unsigned version of a TYPE_NODE, a scalar type. */ | |
2092 | ||
2093 | tree | |
2094 | gnat_unsigned_type (tree type_node) | |
2095 | { | |
2096 | tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 1); | |
2097 | ||
2098 | if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node)) | |
2099 | { | |
2100 | type = copy_node (type); | |
2101 | TREE_TYPE (type) = type_node; | |
2102 | } | |
2103 | else if (TREE_TYPE (type_node) | |
2104 | && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE | |
2105 | && TYPE_MODULAR_P (TREE_TYPE (type_node))) | |
2106 | { | |
2107 | type = copy_node (type); | |
2108 | TREE_TYPE (type) = TREE_TYPE (type_node); | |
2109 | } | |
2110 | ||
2111 | return type; | |
2112 | } | |
2113 | ||
2114 | /* Return the signed version of a TYPE_NODE, a scalar type. */ | |
2115 | ||
2116 | tree | |
2117 | gnat_signed_type (tree type_node) | |
2118 | { | |
2119 | tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 0); | |
2120 | ||
2121 | if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node)) | |
2122 | { | |
2123 | type = copy_node (type); | |
2124 | TREE_TYPE (type) = type_node; | |
2125 | } | |
2126 | else if (TREE_TYPE (type_node) | |
2127 | && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE | |
2128 | && TYPE_MODULAR_P (TREE_TYPE (type_node))) | |
2129 | { | |
2130 | type = copy_node (type); | |
2131 | TREE_TYPE (type) = TREE_TYPE (type_node); | |
2132 | } | |
2133 | ||
2134 | return type; | |
2135 | } | |
2136 | ||
2137 | /* Return 1 if the types T1 and T2 are compatible, i.e. if they can be | |
2138 | transparently converted to each other. */ | |
2139 | ||
2140 | int | |
2141 | gnat_types_compatible_p (tree t1, tree t2) | |
2142 | { | |
2143 | enum tree_code code; | |
2144 | ||
2145 | /* This is the default criterion. */ | |
2146 | if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) | |
2147 | return 1; | |
2148 | ||
2149 | /* We only check structural equivalence here. */ | |
2150 | if ((code = TREE_CODE (t1)) != TREE_CODE (t2)) | |
2151 | return 0; | |
2152 | ||
7948ae37 OH |
2153 | /* Vector types are also compatible if they have the same number of subparts |
2154 | and the same form of (scalar) element type. */ | |
2155 | if (code == VECTOR_TYPE | |
2156 | && TYPE_VECTOR_SUBPARTS (t1) == TYPE_VECTOR_SUBPARTS (t2) | |
2157 | && TREE_CODE (TREE_TYPE (t1)) == TREE_CODE (TREE_TYPE (t2)) | |
2158 | && TYPE_PRECISION (TREE_TYPE (t1)) == TYPE_PRECISION (TREE_TYPE (t2))) | |
2159 | return 1; | |
2160 | ||
cfa0bd19 | 2161 | /* Array types are also compatible if they are constrained and have the same |
96bba5e6 | 2162 | domain(s) and the same component type. */ |
a1ab4c31 | 2163 | if (code == ARRAY_TYPE |
0adef32b JJ |
2164 | && (TYPE_DOMAIN (t1) == TYPE_DOMAIN (t2) |
2165 | || (TYPE_DOMAIN (t1) | |
b4680ca1 | 2166 | && TYPE_DOMAIN (t2) |
0adef32b JJ |
2167 | && tree_int_cst_equal (TYPE_MIN_VALUE (TYPE_DOMAIN (t1)), |
2168 | TYPE_MIN_VALUE (TYPE_DOMAIN (t2))) | |
2169 | && tree_int_cst_equal (TYPE_MAX_VALUE (TYPE_DOMAIN (t1)), | |
cfa0bd19 | 2170 | TYPE_MAX_VALUE (TYPE_DOMAIN (t2))))) |
96bba5e6 EB |
2171 | && (TREE_TYPE (t1) == TREE_TYPE (t2) |
2172 | || (TREE_CODE (TREE_TYPE (t1)) == ARRAY_TYPE | |
2173 | && gnat_types_compatible_p (TREE_TYPE (t1), TREE_TYPE (t2))))) | |
a1ab4c31 AC |
2174 | return 1; |
2175 | ||
2176 | /* Padding record types are also compatible if they pad the same | |
2177 | type and have the same constant size. */ | |
2178 | if (code == RECORD_TYPE | |
315cff15 | 2179 | && TYPE_PADDING_P (t1) && TYPE_PADDING_P (t2) |
a1ab4c31 AC |
2180 | && TREE_TYPE (TYPE_FIELDS (t1)) == TREE_TYPE (TYPE_FIELDS (t2)) |
2181 | && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))) | |
2182 | return 1; | |
2183 | ||
2184 | return 0; | |
2185 | } | |
523e82a7 EB |
2186 | |
2187 | /* Return true if T, a FUNCTION_TYPE, has the specified list of flags. */ | |
2188 | ||
2189 | bool | |
2190 | fntype_same_flags_p (const_tree t, tree cico_list, bool return_unconstrained_p, | |
2191 | bool return_by_direct_ref_p, bool return_by_invisi_ref_p) | |
2192 | { | |
2193 | return TYPE_CI_CO_LIST (t) == cico_list | |
2194 | && TYPE_RETURN_UNCONSTRAINED_P (t) == return_unconstrained_p | |
2195 | && TYPE_RETURN_BY_DIRECT_REF_P (t) == return_by_direct_ref_p | |
2196 | && TREE_ADDRESSABLE (t) == return_by_invisi_ref_p; | |
2197 | } | |
a1ab4c31 AC |
2198 | \f |
2199 | /* EXP is an expression for the size of an object. If this size contains | |
2200 | discriminant references, replace them with the maximum (if MAX_P) or | |
2201 | minimum (if !MAX_P) possible value of the discriminant. */ | |
2202 | ||
2203 | tree | |
2204 | max_size (tree exp, bool max_p) | |
2205 | { | |
2206 | enum tree_code code = TREE_CODE (exp); | |
2207 | tree type = TREE_TYPE (exp); | |
2208 | ||
2209 | switch (TREE_CODE_CLASS (code)) | |
2210 | { | |
2211 | case tcc_declaration: | |
2212 | case tcc_constant: | |
2213 | return exp; | |
2214 | ||
2215 | case tcc_vl_exp: | |
2216 | if (code == CALL_EXPR) | |
2217 | { | |
f82a627c EB |
2218 | tree t, *argarray; |
2219 | int n, i; | |
2220 | ||
2221 | t = maybe_inline_call_in_expr (exp); | |
2222 | if (t) | |
2223 | return max_size (t, max_p); | |
a1ab4c31 | 2224 | |
f82a627c EB |
2225 | n = call_expr_nargs (exp); |
2226 | gcc_assert (n > 0); | |
2bb1fc26 | 2227 | argarray = XALLOCAVEC (tree, n); |
a1ab4c31 AC |
2228 | for (i = 0; i < n; i++) |
2229 | argarray[i] = max_size (CALL_EXPR_ARG (exp, i), max_p); | |
2230 | return build_call_array (type, CALL_EXPR_FN (exp), n, argarray); | |
2231 | } | |
2232 | break; | |
2233 | ||
2234 | case tcc_reference: | |
2235 | /* If this contains a PLACEHOLDER_EXPR, it is the thing we want to | |
2236 | modify. Otherwise, we treat it like a variable. */ | |
2237 | if (!CONTAINS_PLACEHOLDER_P (exp)) | |
2238 | return exp; | |
2239 | ||
2240 | type = TREE_TYPE (TREE_OPERAND (exp, 1)); | |
2241 | return | |
2242 | max_size (max_p ? TYPE_MAX_VALUE (type) : TYPE_MIN_VALUE (type), true); | |
2243 | ||
2244 | case tcc_comparison: | |
2245 | return max_p ? size_one_node : size_zero_node; | |
2246 | ||
2247 | case tcc_unary: | |
2248 | case tcc_binary: | |
2249 | case tcc_expression: | |
2250 | switch (TREE_CODE_LENGTH (code)) | |
2251 | { | |
2252 | case 1: | |
2253 | if (code == NON_LVALUE_EXPR) | |
2254 | return max_size (TREE_OPERAND (exp, 0), max_p); | |
2255 | else | |
2256 | return | |
2257 | fold_build1 (code, type, | |
2258 | max_size (TREE_OPERAND (exp, 0), | |
2259 | code == NEGATE_EXPR ? !max_p : max_p)); | |
2260 | ||
2261 | case 2: | |
2262 | if (code == COMPOUND_EXPR) | |
2263 | return max_size (TREE_OPERAND (exp, 1), max_p); | |
2264 | ||
a1ab4c31 AC |
2265 | { |
2266 | tree lhs = max_size (TREE_OPERAND (exp, 0), max_p); | |
2267 | tree rhs = max_size (TREE_OPERAND (exp, 1), | |
2268 | code == MINUS_EXPR ? !max_p : max_p); | |
2269 | ||
2270 | /* Special-case wanting the maximum value of a MIN_EXPR. | |
2271 | In that case, if one side overflows, return the other. | |
2272 | sizetype is signed, but we know sizes are non-negative. | |
2273 | Likewise, handle a MINUS_EXPR or PLUS_EXPR with the LHS | |
586388fd | 2274 | overflowing and the RHS a variable. */ |
a1ab4c31 AC |
2275 | if (max_p |
2276 | && code == MIN_EXPR | |
2277 | && TREE_CODE (rhs) == INTEGER_CST | |
2278 | && TREE_OVERFLOW (rhs)) | |
2279 | return lhs; | |
2280 | else if (max_p | |
2281 | && code == MIN_EXPR | |
2282 | && TREE_CODE (lhs) == INTEGER_CST | |
2283 | && TREE_OVERFLOW (lhs)) | |
2284 | return rhs; | |
2285 | else if ((code == MINUS_EXPR || code == PLUS_EXPR) | |
586388fd EB |
2286 | && TREE_CODE (lhs) == INTEGER_CST |
2287 | && TREE_OVERFLOW (lhs) | |
a1ab4c31 AC |
2288 | && !TREE_CONSTANT (rhs)) |
2289 | return lhs; | |
2290 | else | |
2291 | return fold_build2 (code, type, lhs, rhs); | |
2292 | } | |
2293 | ||
2294 | case 3: | |
2295 | if (code == SAVE_EXPR) | |
2296 | return exp; | |
2297 | else if (code == COND_EXPR) | |
2298 | return fold_build2 (max_p ? MAX_EXPR : MIN_EXPR, type, | |
2299 | max_size (TREE_OPERAND (exp, 1), max_p), | |
2300 | max_size (TREE_OPERAND (exp, 2), max_p)); | |
2301 | } | |
2302 | ||
2303 | /* Other tree classes cannot happen. */ | |
2304 | default: | |
2305 | break; | |
2306 | } | |
2307 | ||
2308 | gcc_unreachable (); | |
2309 | } | |
2310 | \f | |
2311 | /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE. | |
2312 | EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs. | |
2313 | Return a constructor for the template. */ | |
2314 | ||
2315 | tree | |
2316 | build_template (tree template_type, tree array_type, tree expr) | |
2317 | { | |
0e228dd9 | 2318 | VEC(constructor_elt,gc) *template_elts = NULL; |
a1ab4c31 AC |
2319 | tree bound_list = NULL_TREE; |
2320 | tree field; | |
2321 | ||
2322 | while (TREE_CODE (array_type) == RECORD_TYPE | |
315cff15 | 2323 | && (TYPE_PADDING_P (array_type) |
a1ab4c31 AC |
2324 | || TYPE_JUSTIFIED_MODULAR_P (array_type))) |
2325 | array_type = TREE_TYPE (TYPE_FIELDS (array_type)); | |
2326 | ||
2327 | if (TREE_CODE (array_type) == ARRAY_TYPE | |
2328 | || (TREE_CODE (array_type) == INTEGER_TYPE | |
2329 | && TYPE_HAS_ACTUAL_BOUNDS_P (array_type))) | |
2330 | bound_list = TYPE_ACTUAL_BOUNDS (array_type); | |
2331 | ||
2332 | /* First make the list for a CONSTRUCTOR for the template. Go down the | |
2333 | field list of the template instead of the type chain because this | |
2334 | array might be an Ada array of arrays and we can't tell where the | |
2335 | nested arrays stop being the underlying object. */ | |
2336 | ||
2337 | for (field = TYPE_FIELDS (template_type); field; | |
2338 | (bound_list | |
2339 | ? (bound_list = TREE_CHAIN (bound_list)) | |
2340 | : (array_type = TREE_TYPE (array_type))), | |
910ad8de | 2341 | field = DECL_CHAIN (DECL_CHAIN (field))) |
a1ab4c31 AC |
2342 | { |
2343 | tree bounds, min, max; | |
2344 | ||
2345 | /* If we have a bound list, get the bounds from there. Likewise | |
2346 | for an ARRAY_TYPE. Otherwise, if expr is a PARM_DECL with | |
2347 | DECL_BY_COMPONENT_PTR_P, use the bounds of the field in the template. | |
2348 | This will give us a maximum range. */ | |
2349 | if (bound_list) | |
2350 | bounds = TREE_VALUE (bound_list); | |
2351 | else if (TREE_CODE (array_type) == ARRAY_TYPE) | |
2352 | bounds = TYPE_INDEX_TYPE (TYPE_DOMAIN (array_type)); | |
2353 | else if (expr && TREE_CODE (expr) == PARM_DECL | |
2354 | && DECL_BY_COMPONENT_PTR_P (expr)) | |
2355 | bounds = TREE_TYPE (field); | |
2356 | else | |
2357 | gcc_unreachable (); | |
2358 | ||
2359 | min = convert (TREE_TYPE (field), TYPE_MIN_VALUE (bounds)); | |
910ad8de | 2360 | max = convert (TREE_TYPE (DECL_CHAIN (field)), TYPE_MAX_VALUE (bounds)); |
a1ab4c31 AC |
2361 | |
2362 | /* If either MIN or MAX involve a PLACEHOLDER_EXPR, we must | |
2363 | substitute it from OBJECT. */ | |
2364 | min = SUBSTITUTE_PLACEHOLDER_IN_EXPR (min, expr); | |
2365 | max = SUBSTITUTE_PLACEHOLDER_IN_EXPR (max, expr); | |
2366 | ||
0e228dd9 | 2367 | CONSTRUCTOR_APPEND_ELT (template_elts, field, min); |
910ad8de | 2368 | CONSTRUCTOR_APPEND_ELT (template_elts, DECL_CHAIN (field), max); |
a1ab4c31 AC |
2369 | } |
2370 | ||
0e228dd9 | 2371 | return gnat_build_constructor (template_type, template_elts); |
a1ab4c31 AC |
2372 | } |
2373 | \f | |
31a5a547 EB |
2374 | /* Helper routine to make a descriptor field. FIELD_LIST is the list of decls |
2375 | being built; the new decl is chained on to the front of the list. */ | |
2376 | ||
2377 | static tree | |
2378 | make_descriptor_field (const char *name, tree type, tree rec_type, | |
2379 | tree initial, tree field_list) | |
2380 | { | |
2381 | tree field | |
2382 | = create_field_decl (get_identifier (name), type, rec_type, NULL_TREE, | |
2383 | NULL_TREE, 0, 0); | |
2384 | ||
2385 | DECL_INITIAL (field) = initial; | |
2386 | DECL_CHAIN (field) = field_list; | |
2387 | return field; | |
2388 | } | |
2389 | ||
58c8f770 EB |
2390 | /* Build a 32-bit VMS descriptor from a Mechanism_Type, which must specify a |
2391 | descriptor type, and the GCC type of an object. Each FIELD_DECL in the | |
2392 | type contains in its DECL_INITIAL the expression to use when a constructor | |
2393 | is made for the type. GNAT_ENTITY is an entity used to print out an error | |
2394 | message if the mechanism cannot be applied to an object of that type and | |
2395 | also for the name. */ | |
a1ab4c31 AC |
2396 | |
2397 | tree | |
d628c015 | 2398 | build_vms_descriptor32 (tree type, Mechanism_Type mech, Entity_Id gnat_entity) |
a1ab4c31 AC |
2399 | { |
2400 | tree record_type = make_node (RECORD_TYPE); | |
31a5a547 | 2401 | tree pointer32_type, pointer64_type; |
788e5046 | 2402 | tree field_list = NULL_TREE; |
31a5a547 EB |
2403 | int klass, ndim, i, dtype = 0; |
2404 | tree inner_type, tem; | |
a1ab4c31 | 2405 | tree *idx_arr; |
a1ab4c31 AC |
2406 | |
2407 | /* If TYPE is an unconstrained array, use the underlying array type. */ | |
2408 | if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) | |
2409 | type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))); | |
2410 | ||
2411 | /* If this is an array, compute the number of dimensions in the array, | |
2412 | get the index types, and point to the inner type. */ | |
2413 | if (TREE_CODE (type) != ARRAY_TYPE) | |
2414 | ndim = 0; | |
2415 | else | |
2416 | for (ndim = 1, inner_type = type; | |
2417 | TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE | |
2418 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type)); | |
2419 | ndim++, inner_type = TREE_TYPE (inner_type)) | |
2420 | ; | |
2421 | ||
2bb1fc26 | 2422 | idx_arr = XALLOCAVEC (tree, ndim); |
a1ab4c31 | 2423 | |
d628c015 | 2424 | if (mech != By_Descriptor_NCA && mech != By_Short_Descriptor_NCA |
a1ab4c31 AC |
2425 | && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type)) |
2426 | for (i = ndim - 1, inner_type = type; | |
2427 | i >= 0; | |
2428 | i--, inner_type = TREE_TYPE (inner_type)) | |
2429 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
2430 | else | |
2431 | for (i = 0, inner_type = type; | |
2432 | i < ndim; | |
2433 | i++, inner_type = TREE_TYPE (inner_type)) | |
2434 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
2435 | ||
2436 | /* Now get the DTYPE value. */ | |
2437 | switch (TREE_CODE (type)) | |
2438 | { | |
2439 | case INTEGER_TYPE: | |
2440 | case ENUMERAL_TYPE: | |
01ddebf2 | 2441 | case BOOLEAN_TYPE: |
a1ab4c31 AC |
2442 | if (TYPE_VAX_FLOATING_POINT_P (type)) |
2443 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
2444 | { | |
2445 | case 6: | |
2446 | dtype = 10; | |
2447 | break; | |
2448 | case 9: | |
2449 | dtype = 11; | |
2450 | break; | |
2451 | case 15: | |
2452 | dtype = 27; | |
2453 | break; | |
2454 | } | |
2455 | else | |
2456 | switch (GET_MODE_BITSIZE (TYPE_MODE (type))) | |
2457 | { | |
2458 | case 8: | |
2459 | dtype = TYPE_UNSIGNED (type) ? 2 : 6; | |
2460 | break; | |
2461 | case 16: | |
2462 | dtype = TYPE_UNSIGNED (type) ? 3 : 7; | |
2463 | break; | |
2464 | case 32: | |
2465 | dtype = TYPE_UNSIGNED (type) ? 4 : 8; | |
2466 | break; | |
2467 | case 64: | |
2468 | dtype = TYPE_UNSIGNED (type) ? 5 : 9; | |
2469 | break; | |
2470 | case 128: | |
2471 | dtype = TYPE_UNSIGNED (type) ? 25 : 26; | |
2472 | break; | |
2473 | } | |
2474 | break; | |
2475 | ||
2476 | case REAL_TYPE: | |
2477 | dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53; | |
2478 | break; | |
2479 | ||
2480 | case COMPLEX_TYPE: | |
2481 | if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE | |
2482 | && TYPE_VAX_FLOATING_POINT_P (type)) | |
2483 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
2484 | { | |
2485 | case 6: | |
2486 | dtype = 12; | |
2487 | break; | |
2488 | case 9: | |
2489 | dtype = 13; | |
2490 | break; | |
2491 | case 15: | |
2492 | dtype = 29; | |
2493 | } | |
2494 | else | |
2495 | dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55; | |
2496 | break; | |
2497 | ||
2498 | case ARRAY_TYPE: | |
2499 | dtype = 14; | |
2500 | break; | |
2501 | ||
2502 | default: | |
2503 | break; | |
2504 | } | |
2505 | ||
2506 | /* Get the CLASS value. */ | |
2507 | switch (mech) | |
2508 | { | |
2509 | case By_Descriptor_A: | |
d628c015 | 2510 | case By_Short_Descriptor_A: |
c6bd4220 | 2511 | klass = 4; |
a1ab4c31 AC |
2512 | break; |
2513 | case By_Descriptor_NCA: | |
d628c015 | 2514 | case By_Short_Descriptor_NCA: |
c6bd4220 | 2515 | klass = 10; |
a1ab4c31 AC |
2516 | break; |
2517 | case By_Descriptor_SB: | |
d628c015 | 2518 | case By_Short_Descriptor_SB: |
c6bd4220 | 2519 | klass = 15; |
a1ab4c31 AC |
2520 | break; |
2521 | case By_Descriptor: | |
d628c015 | 2522 | case By_Short_Descriptor: |
a1ab4c31 | 2523 | case By_Descriptor_S: |
d628c015 | 2524 | case By_Short_Descriptor_S: |
a1ab4c31 | 2525 | default: |
c6bd4220 | 2526 | klass = 1; |
a1ab4c31 AC |
2527 | break; |
2528 | } | |
2529 | ||
58c8f770 EB |
2530 | /* Make the type for a descriptor for VMS. The first four fields are the |
2531 | same for all types. */ | |
82b481ed EB |
2532 | field_list |
2533 | = make_descriptor_field ("LENGTH", gnat_type_for_size (16, 1), record_type, | |
2534 | size_in_bytes ((mech == By_Descriptor_A | |
2535 | || mech == By_Short_Descriptor_A) | |
2536 | ? inner_type : type), | |
2537 | field_list); | |
2538 | field_list | |
2539 | = make_descriptor_field ("DTYPE", gnat_type_for_size (8, 1), record_type, | |
2540 | size_int (dtype), field_list); | |
2541 | field_list | |
2542 | = make_descriptor_field ("CLASS", gnat_type_for_size (8, 1), record_type, | |
2543 | size_int (klass), field_list); | |
a1ab4c31 | 2544 | |
a1ab4c31 | 2545 | pointer32_type = build_pointer_type_for_mode (type, SImode, false); |
31a5a547 EB |
2546 | pointer64_type = build_pointer_type_for_mode (type, DImode, false); |
2547 | ||
2548 | /* Ensure that only 32-bit pointers are passed in 32-bit descriptors. Note | |
2549 | that we cannot build a template call to the CE routine as it would get a | |
2550 | wrong source location; instead we use a second placeholder for it. */ | |
2551 | tem = build_unary_op (ADDR_EXPR, pointer64_type, | |
2552 | build0 (PLACEHOLDER_EXPR, type)); | |
2553 | tem = build3 (COND_EXPR, pointer32_type, | |
2554 | build_binary_op (GE_EXPR, boolean_type_node, tem, | |
2555 | build_int_cstu (pointer64_type, 0x80000000)), | |
2556 | build0 (PLACEHOLDER_EXPR, void_type_node), | |
2557 | convert (pointer32_type, tem)); | |
a1ab4c31 | 2558 | |
82b481ed | 2559 | field_list |
31a5a547 | 2560 | = make_descriptor_field ("POINTER", pointer32_type, record_type, tem, |
82b481ed | 2561 | field_list); |
a1ab4c31 AC |
2562 | |
2563 | switch (mech) | |
2564 | { | |
2565 | case By_Descriptor: | |
d628c015 | 2566 | case By_Short_Descriptor: |
a1ab4c31 | 2567 | case By_Descriptor_S: |
d628c015 | 2568 | case By_Short_Descriptor_S: |
a1ab4c31 AC |
2569 | break; |
2570 | ||
2571 | case By_Descriptor_SB: | |
d628c015 | 2572 | case By_Short_Descriptor_SB: |
82b481ed EB |
2573 | field_list |
2574 | = make_descriptor_field ("SB_L1", gnat_type_for_size (32, 1), | |
2575 | record_type, | |
2576 | (TREE_CODE (type) == ARRAY_TYPE | |
2577 | ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) | |
2578 | : size_zero_node), | |
2579 | field_list); | |
2580 | field_list | |
2581 | = make_descriptor_field ("SB_U1", gnat_type_for_size (32, 1), | |
2582 | record_type, | |
2583 | (TREE_CODE (type) == ARRAY_TYPE | |
2584 | ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
2585 | : size_zero_node), | |
2586 | field_list); | |
a1ab4c31 AC |
2587 | break; |
2588 | ||
2589 | case By_Descriptor_A: | |
d628c015 | 2590 | case By_Short_Descriptor_A: |
a1ab4c31 | 2591 | case By_Descriptor_NCA: |
d628c015 | 2592 | case By_Short_Descriptor_NCA: |
82b481ed EB |
2593 | field_list |
2594 | = make_descriptor_field ("SCALE", gnat_type_for_size (8, 1), | |
2595 | record_type, size_zero_node, field_list); | |
2596 | ||
2597 | field_list | |
2598 | = make_descriptor_field ("DIGITS", gnat_type_for_size (8, 1), | |
2599 | record_type, size_zero_node, field_list); | |
2600 | ||
82b481ed EB |
2601 | field_list |
2602 | = make_descriptor_field ("AFLAGS", gnat_type_for_size (8, 1), | |
2603 | record_type, | |
2604 | size_int ((mech == By_Descriptor_NCA | |
2605 | || mech == By_Short_Descriptor_NCA) | |
2606 | ? 0 | |
2607 | /* Set FL_COLUMN, FL_COEFF, and | |
2608 | FL_BOUNDS. */ | |
2609 | : (TREE_CODE (type) == ARRAY_TYPE | |
2610 | && TYPE_CONVENTION_FORTRAN_P | |
2611 | (type) | |
2612 | ? 224 : 192)), | |
2613 | field_list); | |
2614 | ||
2615 | field_list | |
2616 | = make_descriptor_field ("DIMCT", gnat_type_for_size (8, 1), | |
2617 | record_type, size_int (ndim), field_list); | |
2618 | ||
2619 | field_list | |
2620 | = make_descriptor_field ("ARSIZE", gnat_type_for_size (32, 1), | |
2621 | record_type, size_in_bytes (type), | |
2622 | field_list); | |
a1ab4c31 AC |
2623 | |
2624 | /* Now build a pointer to the 0,0,0... element. */ | |
2625 | tem = build0 (PLACEHOLDER_EXPR, type); | |
2626 | for (i = 0, inner_type = type; i < ndim; | |
2627 | i++, inner_type = TREE_TYPE (inner_type)) | |
2628 | tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem, | |
2629 | convert (TYPE_DOMAIN (inner_type), size_zero_node), | |
2630 | NULL_TREE, NULL_TREE); | |
2631 | ||
82b481ed EB |
2632 | field_list |
2633 | = make_descriptor_field ("A0", pointer32_type, record_type, | |
2634 | build1 (ADDR_EXPR, pointer32_type, tem), | |
2635 | field_list); | |
a1ab4c31 AC |
2636 | |
2637 | /* Next come the addressing coefficients. */ | |
2638 | tem = size_one_node; | |
2639 | for (i = 0; i < ndim; i++) | |
2640 | { | |
2641 | char fname[3]; | |
2642 | tree idx_length | |
2643 | = size_binop (MULT_EXPR, tem, | |
2644 | size_binop (PLUS_EXPR, | |
2645 | size_binop (MINUS_EXPR, | |
2646 | TYPE_MAX_VALUE (idx_arr[i]), | |
2647 | TYPE_MIN_VALUE (idx_arr[i])), | |
2648 | size_int (1))); | |
2649 | ||
d628c015 DR |
2650 | fname[0] = ((mech == By_Descriptor_NCA || |
2651 | mech == By_Short_Descriptor_NCA) ? 'S' : 'M'); | |
a1ab4c31 | 2652 | fname[1] = '0' + i, fname[2] = 0; |
82b481ed EB |
2653 | field_list |
2654 | = make_descriptor_field (fname, gnat_type_for_size (32, 1), | |
2655 | record_type, idx_length, field_list); | |
a1ab4c31 | 2656 | |
d628c015 | 2657 | if (mech == By_Descriptor_NCA || mech == By_Short_Descriptor_NCA) |
a1ab4c31 AC |
2658 | tem = idx_length; |
2659 | } | |
2660 | ||
2661 | /* Finally here are the bounds. */ | |
2662 | for (i = 0; i < ndim; i++) | |
2663 | { | |
2664 | char fname[3]; | |
2665 | ||
2666 | fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0; | |
82b481ed EB |
2667 | field_list |
2668 | = make_descriptor_field (fname, gnat_type_for_size (32, 1), | |
2669 | record_type, TYPE_MIN_VALUE (idx_arr[i]), | |
2670 | field_list); | |
a1ab4c31 AC |
2671 | |
2672 | fname[0] = 'U'; | |
82b481ed EB |
2673 | field_list |
2674 | = make_descriptor_field (fname, gnat_type_for_size (32, 1), | |
2675 | record_type, TYPE_MAX_VALUE (idx_arr[i]), | |
2676 | field_list); | |
a1ab4c31 AC |
2677 | } |
2678 | break; | |
2679 | ||
2680 | default: | |
2681 | post_error ("unsupported descriptor type for &", gnat_entity); | |
2682 | } | |
2683 | ||
10069d53 | 2684 | TYPE_NAME (record_type) = create_concat_name (gnat_entity, "DESC"); |
788e5046 | 2685 | finish_record_type (record_type, nreverse (field_list), 0, false); |
a1ab4c31 AC |
2686 | return record_type; |
2687 | } | |
2688 | ||
58c8f770 EB |
2689 | /* Build a 64-bit VMS descriptor from a Mechanism_Type, which must specify a |
2690 | descriptor type, and the GCC type of an object. Each FIELD_DECL in the | |
2691 | type contains in its DECL_INITIAL the expression to use when a constructor | |
2692 | is made for the type. GNAT_ENTITY is an entity used to print out an error | |
2693 | message if the mechanism cannot be applied to an object of that type and | |
2694 | also for the name. */ | |
6ca2b0a0 DR |
2695 | |
2696 | tree | |
d628c015 | 2697 | build_vms_descriptor (tree type, Mechanism_Type mech, Entity_Id gnat_entity) |
6ca2b0a0 | 2698 | { |
31a5a547 | 2699 | tree record_type = make_node (RECORD_TYPE); |
6ca2b0a0 | 2700 | tree pointer64_type; |
31a5a547 EB |
2701 | tree field_list = NULL_TREE; |
2702 | int klass, ndim, i, dtype = 0; | |
2703 | tree inner_type, tem; | |
6ca2b0a0 | 2704 | tree *idx_arr; |
6ca2b0a0 DR |
2705 | |
2706 | /* If TYPE is an unconstrained array, use the underlying array type. */ | |
2707 | if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) | |
2708 | type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))); | |
2709 | ||
2710 | /* If this is an array, compute the number of dimensions in the array, | |
2711 | get the index types, and point to the inner type. */ | |
2712 | if (TREE_CODE (type) != ARRAY_TYPE) | |
2713 | ndim = 0; | |
2714 | else | |
2715 | for (ndim = 1, inner_type = type; | |
2716 | TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE | |
2717 | && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type)); | |
2718 | ndim++, inner_type = TREE_TYPE (inner_type)) | |
2719 | ; | |
2720 | ||
2bb1fc26 | 2721 | idx_arr = XALLOCAVEC (tree, ndim); |
6ca2b0a0 DR |
2722 | |
2723 | if (mech != By_Descriptor_NCA | |
2724 | && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type)) | |
2725 | for (i = ndim - 1, inner_type = type; | |
2726 | i >= 0; | |
2727 | i--, inner_type = TREE_TYPE (inner_type)) | |
2728 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
2729 | else | |
2730 | for (i = 0, inner_type = type; | |
2731 | i < ndim; | |
2732 | i++, inner_type = TREE_TYPE (inner_type)) | |
2733 | idx_arr[i] = TYPE_DOMAIN (inner_type); | |
2734 | ||
2735 | /* Now get the DTYPE value. */ | |
2736 | switch (TREE_CODE (type)) | |
2737 | { | |
2738 | case INTEGER_TYPE: | |
2739 | case ENUMERAL_TYPE: | |
01ddebf2 | 2740 | case BOOLEAN_TYPE: |
6ca2b0a0 DR |
2741 | if (TYPE_VAX_FLOATING_POINT_P (type)) |
2742 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
2743 | { | |
2744 | case 6: | |
2745 | dtype = 10; | |
2746 | break; | |
2747 | case 9: | |
2748 | dtype = 11; | |
2749 | break; | |
2750 | case 15: | |
2751 | dtype = 27; | |
2752 | break; | |
2753 | } | |
2754 | else | |
2755 | switch (GET_MODE_BITSIZE (TYPE_MODE (type))) | |
2756 | { | |
2757 | case 8: | |
2758 | dtype = TYPE_UNSIGNED (type) ? 2 : 6; | |
2759 | break; | |
2760 | case 16: | |
2761 | dtype = TYPE_UNSIGNED (type) ? 3 : 7; | |
2762 | break; | |
2763 | case 32: | |
2764 | dtype = TYPE_UNSIGNED (type) ? 4 : 8; | |
2765 | break; | |
2766 | case 64: | |
2767 | dtype = TYPE_UNSIGNED (type) ? 5 : 9; | |
2768 | break; | |
2769 | case 128: | |
2770 | dtype = TYPE_UNSIGNED (type) ? 25 : 26; | |
2771 | break; | |
2772 | } | |
2773 | break; | |
2774 | ||
2775 | case REAL_TYPE: | |
2776 | dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53; | |
2777 | break; | |
2778 | ||
2779 | case COMPLEX_TYPE: | |
2780 | if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE | |
2781 | && TYPE_VAX_FLOATING_POINT_P (type)) | |
2782 | switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) | |
2783 | { | |
2784 | case 6: | |
2785 | dtype = 12; | |
2786 | break; | |
2787 | case 9: | |
2788 | dtype = 13; | |
2789 | break; | |
2790 | case 15: | |
2791 | dtype = 29; | |
2792 | } | |
2793 | else | |
2794 | dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55; | |
2795 | break; | |
2796 | ||
2797 | case ARRAY_TYPE: | |
2798 | dtype = 14; | |
2799 | break; | |
2800 | ||
2801 | default: | |
2802 | break; | |
2803 | } | |
2804 | ||
2805 | /* Get the CLASS value. */ | |
2806 | switch (mech) | |
2807 | { | |
2808 | case By_Descriptor_A: | |
c6bd4220 | 2809 | klass = 4; |
6ca2b0a0 DR |
2810 | break; |
2811 | case By_Descriptor_NCA: | |
c6bd4220 | 2812 | klass = 10; |
6ca2b0a0 DR |
2813 | break; |
2814 | case By_Descriptor_SB: | |
c6bd4220 | 2815 | klass = 15; |
6ca2b0a0 DR |
2816 | break; |
2817 | case By_Descriptor: | |
2818 | case By_Descriptor_S: | |
2819 | default: | |
c6bd4220 | 2820 | klass = 1; |
6ca2b0a0 DR |
2821 | break; |
2822 | } | |
2823 | ||
58c8f770 | 2824 | /* Make the type for a 64-bit descriptor for VMS. The first six fields |
6ca2b0a0 | 2825 | are the same for all types. */ |
31a5a547 | 2826 | field_list |
788e5046 | 2827 | = make_descriptor_field ("MBO", gnat_type_for_size (16, 1), |
31a5a547 EB |
2828 | record_type, size_int (1), field_list); |
2829 | field_list | |
788e5046 | 2830 | = make_descriptor_field ("DTYPE", gnat_type_for_size (8, 1), |
31a5a547 EB |
2831 | record_type, size_int (dtype), field_list); |
2832 | field_list | |
788e5046 | 2833 | = make_descriptor_field ("CLASS", gnat_type_for_size (8, 1), |
31a5a547 EB |
2834 | record_type, size_int (klass), field_list); |
2835 | field_list | |
788e5046 | 2836 | = make_descriptor_field ("MBMO", gnat_type_for_size (32, 1), |
31a5a547 EB |
2837 | record_type, ssize_int (-1), field_list); |
2838 | field_list | |
788e5046 | 2839 | = make_descriptor_field ("LENGTH", gnat_type_for_size (64, 1), |
31a5a547 | 2840 | record_type, |
788e5046 | 2841 | size_in_bytes (mech == By_Descriptor_A |
82b481ed | 2842 | ? inner_type : type), |
31a5a547 | 2843 | field_list); |
6ca2b0a0 DR |
2844 | |
2845 | pointer64_type = build_pointer_type_for_mode (type, DImode, false); | |
2846 | ||
31a5a547 EB |
2847 | field_list |
2848 | = make_descriptor_field ("POINTER", pointer64_type, record_type, | |
788e5046 | 2849 | build_unary_op (ADDR_EXPR, pointer64_type, |
82b481ed | 2850 | build0 (PLACEHOLDER_EXPR, type)), |
31a5a547 | 2851 | field_list); |
6ca2b0a0 DR |
2852 | |
2853 | switch (mech) | |
2854 | { | |
2855 | case By_Descriptor: | |
2856 | case By_Descriptor_S: | |
2857 | break; | |
2858 | ||
2859 | case By_Descriptor_SB: | |
31a5a547 | 2860 | field_list |
788e5046 | 2861 | = make_descriptor_field ("SB_L1", gnat_type_for_size (64, 1), |
31a5a547 | 2862 | record_type, |
788e5046 NF |
2863 | (TREE_CODE (type) == ARRAY_TYPE |
2864 | ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) | |
82b481ed | 2865 | : size_zero_node), |
31a5a547 EB |
2866 | field_list); |
2867 | field_list | |
788e5046 | 2868 | = make_descriptor_field ("SB_U1", gnat_type_for_size (64, 1), |
31a5a547 | 2869 | record_type, |
788e5046 NF |
2870 | (TREE_CODE (type) == ARRAY_TYPE |
2871 | ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) | |
82b481ed | 2872 | : size_zero_node), |
31a5a547 | 2873 | field_list); |
6ca2b0a0 DR |
2874 | break; |
2875 | ||
2876 | case By_Descriptor_A: | |
2877 | case By_Descriptor_NCA: | |
31a5a547 | 2878 | field_list |
788e5046 | 2879 | = make_descriptor_field ("SCALE", gnat_type_for_size (8, 1), |
31a5a547 | 2880 | record_type, size_zero_node, field_list); |
788e5046 | 2881 | |
31a5a547 | 2882 | field_list |
788e5046 | 2883 | = make_descriptor_field ("DIGITS", gnat_type_for_size (8, 1), |
31a5a547 | 2884 | record_type, size_zero_node, field_list); |
788e5046 NF |
2885 | |
2886 | dtype = (mech == By_Descriptor_NCA | |
2887 | ? 0 | |
2888 | /* Set FL_COLUMN, FL_COEFF, and | |
2889 | FL_BOUNDS. */ | |
2890 | : (TREE_CODE (type) == ARRAY_TYPE | |
2891 | && TYPE_CONVENTION_FORTRAN_P (type) | |
2892 | ? 224 : 192)); | |
31a5a547 | 2893 | field_list |
788e5046 | 2894 | = make_descriptor_field ("AFLAGS", gnat_type_for_size (8, 1), |
31a5a547 EB |
2895 | record_type, size_int (dtype), |
2896 | field_list); | |
6ca2b0a0 | 2897 | |
31a5a547 | 2898 | field_list |
788e5046 | 2899 | = make_descriptor_field ("DIMCT", gnat_type_for_size (8, 1), |
31a5a547 | 2900 | record_type, size_int (ndim), field_list); |
788e5046 | 2901 | |
31a5a547 | 2902 | field_list |
788e5046 | 2903 | = make_descriptor_field ("MBZ", gnat_type_for_size (32, 1), |
31a5a547 EB |
2904 | record_type, size_int (0), field_list); |
2905 | field_list | |
788e5046 | 2906 | = make_descriptor_field ("ARSIZE", gnat_type_for_size (64, 1), |
31a5a547 EB |
2907 | record_type, size_in_bytes (type), |
2908 | field_list); | |
6ca2b0a0 DR |
2909 | |
2910 | /* Now build a pointer to the 0,0,0... element. */ | |
2911 | tem = build0 (PLACEHOLDER_EXPR, type); | |
2912 | for (i = 0, inner_type = type; i < ndim; | |
2913 | i++, inner_type = TREE_TYPE (inner_type)) | |
2914 | tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem, | |
2915 | convert (TYPE_DOMAIN (inner_type), size_zero_node), | |
2916 | NULL_TREE, NULL_TREE); | |
2917 | ||
31a5a547 EB |
2918 | field_list |
2919 | = make_descriptor_field ("A0", pointer64_type, record_type, | |
788e5046 | 2920 | build1 (ADDR_EXPR, pointer64_type, tem), |
31a5a547 | 2921 | field_list); |
6ca2b0a0 DR |
2922 | |
2923 | /* Next come the addressing coefficients. */ | |
2924 | tem = size_one_node; | |
2925 | for (i = 0; i < ndim; i++) | |
2926 | { | |
2927 | char fname[3]; | |
2928 | tree idx_length | |
2929 | = size_binop (MULT_EXPR, tem, | |
2930 | size_binop (PLUS_EXPR, | |
2931 | size_binop (MINUS_EXPR, | |
2932 | TYPE_MAX_VALUE (idx_arr[i]), | |
2933 | TYPE_MIN_VALUE (idx_arr[i])), | |
2934 | size_int (1))); | |
2935 | ||
2936 | fname[0] = (mech == By_Descriptor_NCA ? 'S' : 'M'); | |
2937 | fname[1] = '0' + i, fname[2] = 0; | |
31a5a547 | 2938 | field_list |
788e5046 | 2939 | = make_descriptor_field (fname, gnat_type_for_size (64, 1), |
31a5a547 | 2940 | record_type, idx_length, field_list); |
6ca2b0a0 DR |
2941 | |
2942 | if (mech == By_Descriptor_NCA) | |
2943 | tem = idx_length; | |
2944 | } | |
2945 | ||
2946 | /* Finally here are the bounds. */ | |
2947 | for (i = 0; i < ndim; i++) | |
2948 | { | |
2949 | char fname[3]; | |
2950 | ||
2951 | fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0; | |
31a5a547 | 2952 | field_list |
788e5046 | 2953 | = make_descriptor_field (fname, gnat_type_for_size (64, 1), |
31a5a547 EB |
2954 | record_type, |
2955 | TYPE_MIN_VALUE (idx_arr[i]), field_list); | |
6ca2b0a0 DR |
2956 | |
2957 | fname[0] = 'U'; | |
31a5a547 | 2958 | field_list |
788e5046 | 2959 | = make_descriptor_field (fname, gnat_type_for_size (64, 1), |
31a5a547 EB |
2960 | record_type, |
2961 | TYPE_MAX_VALUE (idx_arr[i]), field_list); | |
6ca2b0a0 DR |
2962 | } |
2963 | break; | |
2964 | ||
2965 | default: | |
2966 | post_error ("unsupported descriptor type for &", gnat_entity); | |
2967 | } | |
2968 | ||
31a5a547 EB |
2969 | TYPE_NAME (record_type) = create_concat_name (gnat_entity, "DESC64"); |
2970 | finish_record_type (record_type, nreverse (field_list), 0, false); | |
2971 | return record_type; | |
6ca2b0a0 DR |
2972 | } |
2973 | ||
31a5a547 EB |
2974 | /* Fill in a VMS descriptor of GNU_TYPE for GNU_EXPR and return the result. |
2975 | GNAT_ACTUAL is the actual parameter for which the descriptor is built. */ | |
a1ab4c31 | 2976 | |
31a5a547 EB |
2977 | tree |
2978 | fill_vms_descriptor (tree gnu_type, tree gnu_expr, Node_Id gnat_actual) | |
a1ab4c31 | 2979 | { |
31a5a547 EB |
2980 | VEC(constructor_elt,gc) *v = NULL; |
2981 | tree field; | |
a1ab4c31 | 2982 | |
31a5a547 EB |
2983 | gnu_expr = maybe_unconstrained_array (gnu_expr); |
2984 | gnu_expr = gnat_protect_expr (gnu_expr); | |
2985 | gnat_mark_addressable (gnu_expr); | |
2986 | ||
2987 | /* We may need to substitute both GNU_EXPR and a CALL_EXPR to the raise CE | |
2988 | routine in case we have a 32-bit descriptor. */ | |
2989 | gnu_expr = build2 (COMPOUND_EXPR, void_type_node, | |
2990 | build_call_raise (CE_Range_Check_Failed, gnat_actual, | |
2991 | N_Raise_Constraint_Error), | |
2992 | gnu_expr); | |
2993 | ||
2994 | for (field = TYPE_FIELDS (gnu_type); field; field = DECL_CHAIN (field)) | |
2995 | { | |
2996 | tree value | |
2997 | = convert (TREE_TYPE (field), | |
2998 | SUBSTITUTE_PLACEHOLDER_IN_EXPR (DECL_INITIAL (field), | |
2999 | gnu_expr)); | |
3000 | CONSTRUCTOR_APPEND_ELT (v, field, value); | |
3001 | } | |
3002 | ||
3003 | return gnat_build_constructor (gnu_type, v); | |
a1ab4c31 AC |
3004 | } |
3005 | ||
d628c015 DR |
3006 | /* Convert GNU_EXPR, a pointer to a 64bit VMS descriptor, to GNU_TYPE, a |
3007 | regular pointer or fat pointer type. GNAT_SUBPROG is the subprogram to | |
3008 | which the VMS descriptor is passed. */ | |
a1ab4c31 AC |
3009 | |
3010 | static tree | |
d628c015 DR |
3011 | convert_vms_descriptor64 (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog) |
3012 | { | |
3013 | tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); | |
3014 | tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); | |
3015 | /* The CLASS field is the 3rd field in the descriptor. */ | |
910ad8de | 3016 | tree klass = DECL_CHAIN (DECL_CHAIN (TYPE_FIELDS (desc_type))); |
d628c015 | 3017 | /* The POINTER field is the 6th field in the descriptor. */ |
910ad8de | 3018 | tree pointer = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (klass))); |
d628c015 DR |
3019 | |
3020 | /* Retrieve the value of the POINTER field. */ | |
3021 | tree gnu_expr64 | |
58c8f770 | 3022 | = build3 (COMPONENT_REF, TREE_TYPE (pointer), desc, pointer, NULL_TREE); |
d628c015 DR |
3023 | |
3024 | if (POINTER_TYPE_P (gnu_type)) | |
3025 | return convert (gnu_type, gnu_expr64); | |
3026 | ||
315cff15 | 3027 | else if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
d628c015 DR |
3028 | { |
3029 | tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type)); | |
3030 | tree p_bounds_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))); | |
3031 | tree template_type = TREE_TYPE (p_bounds_type); | |
3032 | tree min_field = TYPE_FIELDS (template_type); | |
3033 | tree max_field = TREE_CHAIN (TYPE_FIELDS (template_type)); | |
6bf68a93 | 3034 | tree template_tree, template_addr, aflags, dimct, t, u; |
d628c015 | 3035 | /* See the head comment of build_vms_descriptor. */ |
c6bd4220 | 3036 | int iklass = TREE_INT_CST_LOW (DECL_INITIAL (klass)); |
d628c015 | 3037 | tree lfield, ufield; |
0e228dd9 | 3038 | VEC(constructor_elt,gc) *v; |
d628c015 | 3039 | |
86060344 | 3040 | /* Convert POINTER to the pointer-to-array type. */ |
d628c015 DR |
3041 | gnu_expr64 = convert (p_array_type, gnu_expr64); |
3042 | ||
c6bd4220 | 3043 | switch (iklass) |
d628c015 DR |
3044 | { |
3045 | case 1: /* Class S */ | |
3046 | case 15: /* Class SB */ | |
3047 | /* Build {1, LENGTH} template; LENGTH64 is the 5th field. */ | |
0e228dd9 | 3048 | v = VEC_alloc (constructor_elt, gc, 2); |
910ad8de | 3049 | t = DECL_CHAIN (DECL_CHAIN (klass)); |
d628c015 | 3050 | t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
0e228dd9 NF |
3051 | CONSTRUCTOR_APPEND_ELT (v, min_field, |
3052 | convert (TREE_TYPE (min_field), | |
3053 | integer_one_node)); | |
3054 | CONSTRUCTOR_APPEND_ELT (v, max_field, | |
3055 | convert (TREE_TYPE (max_field), t)); | |
3056 | template_tree = gnat_build_constructor (template_type, v); | |
6bf68a93 | 3057 | template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template_tree); |
d628c015 DR |
3058 | |
3059 | /* For class S, we are done. */ | |
c6bd4220 | 3060 | if (iklass == 1) |
d628c015 DR |
3061 | break; |
3062 | ||
3063 | /* Test that we really have a SB descriptor, like DEC Ada. */ | |
c6bd4220 EB |
3064 | t = build3 (COMPONENT_REF, TREE_TYPE (klass), desc, klass, NULL); |
3065 | u = convert (TREE_TYPE (klass), DECL_INITIAL (klass)); | |
1139f2e8 | 3066 | u = build_binary_op (EQ_EXPR, boolean_type_node, t, u); |
d628c015 DR |
3067 | /* If so, there is already a template in the descriptor and |
3068 | it is located right after the POINTER field. The fields are | |
3069 | 64bits so they must be repacked. */ | |
58c8f770 | 3070 | t = TREE_CHAIN (pointer); |
d628c015 DR |
3071 | lfield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3072 | lfield = convert (TREE_TYPE (TYPE_FIELDS (template_type)), lfield); | |
3073 | ||
3074 | t = TREE_CHAIN (t); | |
3075 | ufield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
3076 | ufield = convert | |
910ad8de | 3077 | (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (template_type))), ufield); |
d628c015 DR |
3078 | |
3079 | /* Build the template in the form of a constructor. */ | |
0e228dd9 NF |
3080 | v = VEC_alloc (constructor_elt, gc, 2); |
3081 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (template_type), lfield); | |
3082 | CONSTRUCTOR_APPEND_ELT (v, TREE_CHAIN (TYPE_FIELDS (template_type)), | |
3083 | ufield); | |
3084 | template_tree = gnat_build_constructor (template_type, v); | |
d628c015 DR |
3085 | |
3086 | /* Otherwise use the {1, LENGTH} template we build above. */ | |
3087 | template_addr = build3 (COND_EXPR, p_bounds_type, u, | |
3088 | build_unary_op (ADDR_EXPR, p_bounds_type, | |
6bf68a93 | 3089 | template_tree), |
d628c015 DR |
3090 | template_addr); |
3091 | break; | |
3092 | ||
3093 | case 4: /* Class A */ | |
3094 | /* The AFLAGS field is the 3rd field after the pointer in the | |
3095 | descriptor. */ | |
910ad8de | 3096 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (pointer))); |
d628c015 DR |
3097 | aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3098 | /* The DIMCT field is the next field in the descriptor after | |
3099 | aflags. */ | |
3100 | t = TREE_CHAIN (t); | |
3101 | dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
3102 | /* Raise CONSTRAINT_ERROR if either more than 1 dimension | |
3103 | or FL_COEFF or FL_BOUNDS not set. */ | |
3104 | u = build_int_cst (TREE_TYPE (aflags), 192); | |
1139f2e8 EB |
3105 | u = build_binary_op (TRUTH_OR_EXPR, boolean_type_node, |
3106 | build_binary_op (NE_EXPR, boolean_type_node, | |
d628c015 DR |
3107 | dimct, |
3108 | convert (TREE_TYPE (dimct), | |
3109 | size_one_node)), | |
1139f2e8 | 3110 | build_binary_op (NE_EXPR, boolean_type_node, |
d628c015 DR |
3111 | build2 (BIT_AND_EXPR, |
3112 | TREE_TYPE (aflags), | |
3113 | aflags, u), | |
3114 | u)); | |
3115 | /* There is already a template in the descriptor and it is located | |
3116 | in block 3. The fields are 64bits so they must be repacked. */ | |
910ad8de | 3117 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (DECL_CHAIN |
d628c015 DR |
3118 | (t))))); |
3119 | lfield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
3120 | lfield = convert (TREE_TYPE (TYPE_FIELDS (template_type)), lfield); | |
3121 | ||
3122 | t = TREE_CHAIN (t); | |
3123 | ufield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
3124 | ufield = convert | |
910ad8de | 3125 | (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (template_type))), ufield); |
d628c015 DR |
3126 | |
3127 | /* Build the template in the form of a constructor. */ | |
0e228dd9 NF |
3128 | v = VEC_alloc (constructor_elt, gc, 2); |
3129 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (template_type), lfield); | |
910ad8de | 3130 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (template_type)), |
0e228dd9 NF |
3131 | ufield); |
3132 | template_tree = gnat_build_constructor (template_type, v); | |
f76d6e6f | 3133 | template_tree = build3 (COND_EXPR, template_type, u, |
d628c015 DR |
3134 | build_call_raise (CE_Length_Check_Failed, Empty, |
3135 | N_Raise_Constraint_Error), | |
6bf68a93 | 3136 | template_tree); |
c6bd4220 EB |
3137 | template_addr |
3138 | = build_unary_op (ADDR_EXPR, p_bounds_type, template_tree); | |
d628c015 DR |
3139 | break; |
3140 | ||
3141 | case 10: /* Class NCA */ | |
3142 | default: | |
3143 | post_error ("unsupported descriptor type for &", gnat_subprog); | |
3144 | template_addr = integer_zero_node; | |
3145 | break; | |
3146 | } | |
3147 | ||
3148 | /* Build the fat pointer in the form of a constructor. */ | |
0e228dd9 NF |
3149 | v = VEC_alloc (constructor_elt, gc, 2); |
3150 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (gnu_type), gnu_expr64); | |
910ad8de | 3151 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (gnu_type)), |
0e228dd9 NF |
3152 | template_addr); |
3153 | return gnat_build_constructor (gnu_type, v); | |
d628c015 DR |
3154 | } |
3155 | ||
3156 | else | |
3157 | gcc_unreachable (); | |
3158 | } | |
3159 | ||
3160 | /* Convert GNU_EXPR, a pointer to a 32bit VMS descriptor, to GNU_TYPE, a | |
3161 | regular pointer or fat pointer type. GNAT_SUBPROG is the subprogram to | |
3162 | which the VMS descriptor is passed. */ | |
3163 | ||
3164 | static tree | |
3165 | convert_vms_descriptor32 (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog) | |
a1ab4c31 AC |
3166 | { |
3167 | tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); | |
3168 | tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); | |
3169 | /* The CLASS field is the 3rd field in the descriptor. */ | |
910ad8de | 3170 | tree klass = DECL_CHAIN (DECL_CHAIN (TYPE_FIELDS (desc_type))); |
a1ab4c31 | 3171 | /* The POINTER field is the 4th field in the descriptor. */ |
910ad8de | 3172 | tree pointer = DECL_CHAIN (klass); |
a1ab4c31 AC |
3173 | |
3174 | /* Retrieve the value of the POINTER field. */ | |
d628c015 | 3175 | tree gnu_expr32 |
a1ab4c31 AC |
3176 | = build3 (COMPONENT_REF, TREE_TYPE (pointer), desc, pointer, NULL_TREE); |
3177 | ||
3178 | if (POINTER_TYPE_P (gnu_type)) | |
d628c015 | 3179 | return convert (gnu_type, gnu_expr32); |
a1ab4c31 | 3180 | |
315cff15 | 3181 | else if (TYPE_IS_FAT_POINTER_P (gnu_type)) |
a1ab4c31 AC |
3182 | { |
3183 | tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type)); | |
3184 | tree p_bounds_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))); | |
3185 | tree template_type = TREE_TYPE (p_bounds_type); | |
3186 | tree min_field = TYPE_FIELDS (template_type); | |
3187 | tree max_field = TREE_CHAIN (TYPE_FIELDS (template_type)); | |
6bf68a93 | 3188 | tree template_tree, template_addr, aflags, dimct, t, u; |
a1ab4c31 | 3189 | /* See the head comment of build_vms_descriptor. */ |
c6bd4220 | 3190 | int iklass = TREE_INT_CST_LOW (DECL_INITIAL (klass)); |
0e228dd9 | 3191 | VEC(constructor_elt,gc) *v; |
a1ab4c31 | 3192 | |
86060344 | 3193 | /* Convert POINTER to the pointer-to-array type. */ |
d628c015 | 3194 | gnu_expr32 = convert (p_array_type, gnu_expr32); |
a1ab4c31 | 3195 | |
c6bd4220 | 3196 | switch (iklass) |
a1ab4c31 AC |
3197 | { |
3198 | case 1: /* Class S */ | |
3199 | case 15: /* Class SB */ | |
3200 | /* Build {1, LENGTH} template; LENGTH is the 1st field. */ | |
0e228dd9 | 3201 | v = VEC_alloc (constructor_elt, gc, 2); |
a1ab4c31 AC |
3202 | t = TYPE_FIELDS (desc_type); |
3203 | t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
0e228dd9 NF |
3204 | CONSTRUCTOR_APPEND_ELT (v, min_field, |
3205 | convert (TREE_TYPE (min_field), | |
3206 | integer_one_node)); | |
3207 | CONSTRUCTOR_APPEND_ELT (v, max_field, | |
3208 | convert (TREE_TYPE (max_field), t)); | |
3209 | template_tree = gnat_build_constructor (template_type, v); | |
6bf68a93 | 3210 | template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template_tree); |
a1ab4c31 AC |
3211 | |
3212 | /* For class S, we are done. */ | |
c6bd4220 | 3213 | if (iklass == 1) |
a1ab4c31 AC |
3214 | break; |
3215 | ||
3216 | /* Test that we really have a SB descriptor, like DEC Ada. */ | |
c6bd4220 EB |
3217 | t = build3 (COMPONENT_REF, TREE_TYPE (klass), desc, klass, NULL); |
3218 | u = convert (TREE_TYPE (klass), DECL_INITIAL (klass)); | |
1139f2e8 | 3219 | u = build_binary_op (EQ_EXPR, boolean_type_node, t, u); |
a1ab4c31 AC |
3220 | /* If so, there is already a template in the descriptor and |
3221 | it is located right after the POINTER field. */ | |
3222 | t = TREE_CHAIN (pointer); | |
c6bd4220 EB |
3223 | template_tree |
3224 | = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
a1ab4c31 AC |
3225 | /* Otherwise use the {1, LENGTH} template we build above. */ |
3226 | template_addr = build3 (COND_EXPR, p_bounds_type, u, | |
3227 | build_unary_op (ADDR_EXPR, p_bounds_type, | |
6bf68a93 | 3228 | template_tree), |
a1ab4c31 AC |
3229 | template_addr); |
3230 | break; | |
3231 | ||
3232 | case 4: /* Class A */ | |
3233 | /* The AFLAGS field is the 7th field in the descriptor. */ | |
910ad8de | 3234 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (pointer))); |
a1ab4c31 AC |
3235 | aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
3236 | /* The DIMCT field is the 8th field in the descriptor. */ | |
3237 | t = TREE_CHAIN (t); | |
3238 | dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
3239 | /* Raise CONSTRAINT_ERROR if either more than 1 dimension | |
3240 | or FL_COEFF or FL_BOUNDS not set. */ | |
3241 | u = build_int_cst (TREE_TYPE (aflags), 192); | |
1139f2e8 EB |
3242 | u = build_binary_op (TRUTH_OR_EXPR, boolean_type_node, |
3243 | build_binary_op (NE_EXPR, boolean_type_node, | |
a1ab4c31 AC |
3244 | dimct, |
3245 | convert (TREE_TYPE (dimct), | |
3246 | size_one_node)), | |
1139f2e8 | 3247 | build_binary_op (NE_EXPR, boolean_type_node, |
a1ab4c31 AC |
3248 | build2 (BIT_AND_EXPR, |
3249 | TREE_TYPE (aflags), | |
3250 | aflags, u), | |
3251 | u)); | |
a1ab4c31 AC |
3252 | /* There is already a template in the descriptor and it is |
3253 | located at the start of block 3 (12th field). */ | |
910ad8de | 3254 | t = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (t)))); |
c6bd4220 EB |
3255 | template_tree |
3256 | = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); | |
f76d6e6f | 3257 | template_tree = build3 (COND_EXPR, TREE_TYPE (t), u, |
d628c015 DR |
3258 | build_call_raise (CE_Length_Check_Failed, Empty, |
3259 | N_Raise_Constraint_Error), | |
6bf68a93 | 3260 | template_tree); |
c6bd4220 EB |
3261 | template_addr |
3262 | = build_unary_op (ADDR_EXPR, p_bounds_type, template_tree); | |
a1ab4c31 AC |
3263 | break; |
3264 | ||
3265 | case 10: /* Class NCA */ | |
3266 | default: | |
3267 | post_error ("unsupported descriptor type for &", gnat_subprog); | |
3268 | template_addr = integer_zero_node; | |
3269 | break; | |
3270 | } | |
3271 | ||
3272 | /* Build the fat pointer in the form of a constructor. */ | |
0e228dd9 NF |
3273 | v = VEC_alloc (constructor_elt, gc, 2); |
3274 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (gnu_type), gnu_expr32); | |
910ad8de | 3275 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (gnu_type)), |
0e228dd9 | 3276 | template_addr); |
d628c015 | 3277 | |
0e228dd9 | 3278 | return gnat_build_constructor (gnu_type, v); |
a1ab4c31 AC |
3279 | } |
3280 | ||
3281 | else | |
3282 | gcc_unreachable (); | |
3283 | } | |
3284 | ||
a981c964 EB |
3285 | /* Convert GNU_EXPR, a pointer to a VMS descriptor, to GNU_TYPE, a regular |
3286 | pointer or fat pointer type. GNU_EXPR_ALT_TYPE is the alternate (32-bit) | |
0c700259 EB |
3287 | pointer type of GNU_EXPR. BY_REF is true if the result is to be used by |
3288 | reference. GNAT_SUBPROG is the subprogram to which the VMS descriptor is | |
3289 | passed. */ | |
d628c015 DR |
3290 | |
3291 | static tree | |
a981c964 | 3292 | convert_vms_descriptor (tree gnu_type, tree gnu_expr, tree gnu_expr_alt_type, |
0c700259 | 3293 | bool by_ref, Entity_Id gnat_subprog) |
d628c015 DR |
3294 | { |
3295 | tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); | |
3296 | tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); | |
3297 | tree mbo = TYPE_FIELDS (desc_type); | |
3298 | const char *mbostr = IDENTIFIER_POINTER (DECL_NAME (mbo)); | |
910ad8de | 3299 | tree mbmo = DECL_CHAIN (DECL_CHAIN (DECL_CHAIN (mbo))); |
0c700259 EB |
3300 | tree real_type, is64bit, gnu_expr32, gnu_expr64; |
3301 | ||
3302 | if (by_ref) | |
3303 | real_type = TREE_TYPE (gnu_type); | |
3304 | else | |
3305 | real_type = gnu_type; | |
d628c015 | 3306 | |
a981c964 EB |
3307 | /* If the field name is not MBO, it must be 32-bit and no alternate. |
3308 | Otherwise primary must be 64-bit and alternate 32-bit. */ | |
d628c015 | 3309 | if (strcmp (mbostr, "MBO") != 0) |
0c700259 EB |
3310 | { |
3311 | tree ret = convert_vms_descriptor32 (real_type, gnu_expr, gnat_subprog); | |
3312 | if (by_ref) | |
3313 | ret = build_unary_op (ADDR_EXPR, gnu_type, ret); | |
3314 | return ret; | |
3315 | } | |
d628c015 | 3316 | |
a981c964 | 3317 | /* Build the test for 64-bit descriptor. */ |
d628c015 DR |
3318 | mbo = build3 (COMPONENT_REF, TREE_TYPE (mbo), desc, mbo, NULL_TREE); |
3319 | mbmo = build3 (COMPONENT_REF, TREE_TYPE (mbmo), desc, mbmo, NULL_TREE); | |
a981c964 | 3320 | is64bit |
1139f2e8 EB |
3321 | = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, |
3322 | build_binary_op (EQ_EXPR, boolean_type_node, | |
a981c964 EB |
3323 | convert (integer_type_node, mbo), |
3324 | integer_one_node), | |
1139f2e8 | 3325 | build_binary_op (EQ_EXPR, boolean_type_node, |
a981c964 EB |
3326 | convert (integer_type_node, mbmo), |
3327 | integer_minus_one_node)); | |
3328 | ||
3329 | /* Build the 2 possible end results. */ | |
0c700259 EB |
3330 | gnu_expr64 = convert_vms_descriptor64 (real_type, gnu_expr, gnat_subprog); |
3331 | if (by_ref) | |
3332 | gnu_expr64 = build_unary_op (ADDR_EXPR, gnu_type, gnu_expr64); | |
a981c964 | 3333 | gnu_expr = fold_convert (gnu_expr_alt_type, gnu_expr); |
0c700259 EB |
3334 | gnu_expr32 = convert_vms_descriptor32 (real_type, gnu_expr, gnat_subprog); |
3335 | if (by_ref) | |
3336 | gnu_expr32 = build_unary_op (ADDR_EXPR, gnu_type, gnu_expr32); | |
a981c964 EB |
3337 | |
3338 | return build3 (COND_EXPR, gnu_type, is64bit, gnu_expr64, gnu_expr32); | |
d628c015 DR |
3339 | } |
3340 | ||
a1ab4c31 AC |
3341 | /* Build a stub for the subprogram specified by the GCC tree GNU_SUBPROG |
3342 | and the GNAT node GNAT_SUBPROG. */ | |
3343 | ||
3344 | void | |
3345 | build_function_stub (tree gnu_subprog, Entity_Id gnat_subprog) | |
3346 | { | |
3347 | tree gnu_subprog_type, gnu_subprog_addr, gnu_subprog_call; | |
0c700259 | 3348 | tree gnu_subprog_param, gnu_stub_param, gnu_param; |
a1ab4c31 | 3349 | tree gnu_stub_decl = DECL_FUNCTION_STUB (gnu_subprog); |
3fcb9d1b | 3350 | VEC(tree,gc) *gnu_param_vec = NULL; |
a1ab4c31 AC |
3351 | |
3352 | gnu_subprog_type = TREE_TYPE (gnu_subprog); | |
a1ab4c31 | 3353 | |
a963da4d EB |
3354 | /* Initialize the information structure for the function. */ |
3355 | allocate_struct_function (gnu_stub_decl, false); | |
3356 | set_cfun (NULL); | |
3357 | ||
a1ab4c31 | 3358 | begin_subprog_body (gnu_stub_decl); |
a1ab4c31 AC |
3359 | |
3360 | start_stmt_group (); | |
a963da4d | 3361 | gnat_pushlevel (); |
a1ab4c31 AC |
3362 | |
3363 | /* Loop over the parameters of the stub and translate any of them | |
3364 | passed by descriptor into a by reference one. */ | |
3365 | for (gnu_stub_param = DECL_ARGUMENTS (gnu_stub_decl), | |
0c700259 | 3366 | gnu_subprog_param = DECL_ARGUMENTS (gnu_subprog); |
a1ab4c31 AC |
3367 | gnu_stub_param; |
3368 | gnu_stub_param = TREE_CHAIN (gnu_stub_param), | |
0c700259 | 3369 | gnu_subprog_param = TREE_CHAIN (gnu_subprog_param)) |
a1ab4c31 AC |
3370 | { |
3371 | if (DECL_BY_DESCRIPTOR_P (gnu_stub_param)) | |
0c700259 EB |
3372 | { |
3373 | gcc_assert (DECL_BY_REF_P (gnu_subprog_param)); | |
3374 | gnu_param | |
3375 | = convert_vms_descriptor (TREE_TYPE (gnu_subprog_param), | |
3376 | gnu_stub_param, | |
3377 | DECL_PARM_ALT_TYPE (gnu_stub_param), | |
3378 | DECL_BY_DOUBLE_REF_P (gnu_subprog_param), | |
3379 | gnat_subprog); | |
3380 | } | |
a1ab4c31 AC |
3381 | else |
3382 | gnu_param = gnu_stub_param; | |
3383 | ||
3fcb9d1b | 3384 | VEC_safe_push (tree, gc, gnu_param_vec, gnu_param); |
a1ab4c31 AC |
3385 | } |
3386 | ||
a1ab4c31 AC |
3387 | /* Invoke the internal subprogram. */ |
3388 | gnu_subprog_addr = build1 (ADDR_EXPR, build_pointer_type (gnu_subprog_type), | |
3389 | gnu_subprog); | |
3fcb9d1b NF |
3390 | gnu_subprog_call = build_call_vec (TREE_TYPE (gnu_subprog_type), |
3391 | gnu_subprog_addr, gnu_param_vec); | |
a1ab4c31 AC |
3392 | |
3393 | /* Propagate the return value, if any. */ | |
3394 | if (VOID_TYPE_P (TREE_TYPE (gnu_subprog_type))) | |
a963da4d | 3395 | add_stmt (gnu_subprog_call); |
a1ab4c31 | 3396 | else |
a963da4d EB |
3397 | add_stmt (build_return_expr (DECL_RESULT (gnu_stub_decl), |
3398 | gnu_subprog_call)); | |
a1ab4c31 AC |
3399 | |
3400 | gnat_poplevel (); | |
a963da4d | 3401 | end_subprog_body (end_stmt_group ()); |
a1ab4c31 AC |
3402 | } |
3403 | \f | |
928dfa4b EB |
3404 | /* Build a type to be used to represent an aliased object whose nominal type |
3405 | is an unconstrained array. This consists of a RECORD_TYPE containing a | |
3406 | field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an ARRAY_TYPE. | |
3407 | If ARRAY_TYPE is that of an unconstrained array, this is used to represent | |
3408 | an arbitrary unconstrained object. Use NAME as the name of the record. | |
3409 | DEBUG_INFO_P is true if we need to write debug information for the type. */ | |
a1ab4c31 AC |
3410 | |
3411 | tree | |
928dfa4b EB |
3412 | build_unc_object_type (tree template_type, tree object_type, tree name, |
3413 | bool debug_info_p) | |
a1ab4c31 AC |
3414 | { |
3415 | tree type = make_node (RECORD_TYPE); | |
da01bfee EB |
3416 | tree template_field |
3417 | = create_field_decl (get_identifier ("BOUNDS"), template_type, type, | |
3418 | NULL_TREE, NULL_TREE, 0, 1); | |
3419 | tree array_field | |
3420 | = create_field_decl (get_identifier ("ARRAY"), object_type, type, | |
3421 | NULL_TREE, NULL_TREE, 0, 1); | |
a1ab4c31 AC |
3422 | |
3423 | TYPE_NAME (type) = name; | |
3424 | TYPE_CONTAINS_TEMPLATE_P (type) = 1; | |
910ad8de | 3425 | DECL_CHAIN (template_field) = array_field; |
928dfa4b EB |
3426 | finish_record_type (type, template_field, 0, true); |
3427 | ||
3428 | /* Declare it now since it will never be declared otherwise. This is | |
3429 | necessary to ensure that its subtrees are properly marked. */ | |
3430 | create_type_decl (name, type, NULL, true, debug_info_p, Empty); | |
a1ab4c31 AC |
3431 | |
3432 | return type; | |
3433 | } | |
3434 | ||
3435 | /* Same, taking a thin or fat pointer type instead of a template type. */ | |
3436 | ||
3437 | tree | |
3438 | build_unc_object_type_from_ptr (tree thin_fat_ptr_type, tree object_type, | |
928dfa4b | 3439 | tree name, bool debug_info_p) |
a1ab4c31 AC |
3440 | { |
3441 | tree template_type; | |
3442 | ||
315cff15 | 3443 | gcc_assert (TYPE_IS_FAT_OR_THIN_POINTER_P (thin_fat_ptr_type)); |
a1ab4c31 AC |
3444 | |
3445 | template_type | |
315cff15 | 3446 | = (TYPE_IS_FAT_POINTER_P (thin_fat_ptr_type) |
910ad8de | 3447 | ? TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (thin_fat_ptr_type)))) |
a1ab4c31 | 3448 | : TREE_TYPE (TYPE_FIELDS (TREE_TYPE (thin_fat_ptr_type)))); |
928dfa4b EB |
3449 | |
3450 | return | |
3451 | build_unc_object_type (template_type, object_type, name, debug_info_p); | |
a1ab4c31 AC |
3452 | } |
3453 | ||
3454 | /* Shift the component offsets within an unconstrained object TYPE to make it | |
3455 | suitable for use as a designated type for thin pointers. */ | |
3456 | ||
3457 | void | |
3458 | shift_unc_components_for_thin_pointers (tree type) | |
3459 | { | |
3460 | /* Thin pointer values designate the ARRAY data of an unconstrained object, | |
3461 | allocated past the BOUNDS template. The designated type is adjusted to | |
3462 | have ARRAY at position zero and the template at a negative offset, so | |
3463 | that COMPONENT_REFs on (*thin_ptr) designate the proper location. */ | |
3464 | ||
3465 | tree bounds_field = TYPE_FIELDS (type); | |
910ad8de | 3466 | tree array_field = DECL_CHAIN (TYPE_FIELDS (type)); |
a1ab4c31 AC |
3467 | |
3468 | DECL_FIELD_OFFSET (bounds_field) | |
3469 | = size_binop (MINUS_EXPR, size_zero_node, byte_position (array_field)); | |
3470 | ||
3471 | DECL_FIELD_OFFSET (array_field) = size_zero_node; | |
3472 | DECL_FIELD_BIT_OFFSET (array_field) = bitsize_zero_node; | |
3473 | } | |
3474 | \f | |
229077b0 EB |
3475 | /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE. |
3476 | In the normal case this is just two adjustments, but we have more to | |
3477 | do if NEW_TYPE is an UNCONSTRAINED_ARRAY_TYPE. */ | |
a1ab4c31 AC |
3478 | |
3479 | void | |
3480 | update_pointer_to (tree old_type, tree new_type) | |
3481 | { | |
3482 | tree ptr = TYPE_POINTER_TO (old_type); | |
3483 | tree ref = TYPE_REFERENCE_TO (old_type); | |
aeecf17c | 3484 | tree t; |
a1ab4c31 AC |
3485 | |
3486 | /* If this is the main variant, process all the other variants first. */ | |
3487 | if (TYPE_MAIN_VARIANT (old_type) == old_type) | |
aeecf17c EB |
3488 | for (t = TYPE_NEXT_VARIANT (old_type); t; t = TYPE_NEXT_VARIANT (t)) |
3489 | update_pointer_to (t, new_type); | |
a1ab4c31 | 3490 | |
229077b0 | 3491 | /* If no pointers and no references, we are done. */ |
a1ab4c31 AC |
3492 | if (!ptr && !ref) |
3493 | return; | |
3494 | ||
3495 | /* Merge the old type qualifiers in the new type. | |
3496 | ||
3497 | Each old variant has qualifiers for specific reasons, and the new | |
229077b0 | 3498 | designated type as well. Each set of qualifiers represents useful |
a1ab4c31 AC |
3499 | information grabbed at some point, and merging the two simply unifies |
3500 | these inputs into the final type description. | |
3501 | ||
3502 | Consider for instance a volatile type frozen after an access to constant | |
229077b0 EB |
3503 | type designating it; after the designated type's freeze, we get here with |
3504 | a volatile NEW_TYPE and a dummy OLD_TYPE with a readonly variant, created | |
3505 | when the access type was processed. We will make a volatile and readonly | |
a1ab4c31 AC |
3506 | designated type, because that's what it really is. |
3507 | ||
229077b0 EB |
3508 | We might also get here for a non-dummy OLD_TYPE variant with different |
3509 | qualifiers than those of NEW_TYPE, for instance in some cases of pointers | |
a1ab4c31 | 3510 | to private record type elaboration (see the comments around the call to |
229077b0 EB |
3511 | this routine in gnat_to_gnu_entity <E_Access_Type>). We have to merge |
3512 | the qualifiers in those cases too, to avoid accidentally discarding the | |
3513 | initial set, and will often end up with OLD_TYPE == NEW_TYPE then. */ | |
3514 | new_type | |
3515 | = build_qualified_type (new_type, | |
3516 | TYPE_QUALS (old_type) | TYPE_QUALS (new_type)); | |
3517 | ||
3518 | /* If old type and new type are identical, there is nothing to do. */ | |
a1ab4c31 AC |
3519 | if (old_type == new_type) |
3520 | return; | |
3521 | ||
3522 | /* Otherwise, first handle the simple case. */ | |
3523 | if (TREE_CODE (new_type) != UNCONSTRAINED_ARRAY_TYPE) | |
3524 | { | |
aeecf17c EB |
3525 | tree new_ptr, new_ref; |
3526 | ||
3527 | /* If pointer or reference already points to new type, nothing to do. | |
3528 | This can happen as update_pointer_to can be invoked multiple times | |
3529 | on the same couple of types because of the type variants. */ | |
3530 | if ((ptr && TREE_TYPE (ptr) == new_type) | |
3531 | || (ref && TREE_TYPE (ref) == new_type)) | |
3532 | return; | |
3533 | ||
3534 | /* Chain PTR and its variants at the end. */ | |
3535 | new_ptr = TYPE_POINTER_TO (new_type); | |
3536 | if (new_ptr) | |
3537 | { | |
3538 | while (TYPE_NEXT_PTR_TO (new_ptr)) | |
3539 | new_ptr = TYPE_NEXT_PTR_TO (new_ptr); | |
3540 | TYPE_NEXT_PTR_TO (new_ptr) = ptr; | |
3541 | } | |
3542 | else | |
3543 | TYPE_POINTER_TO (new_type) = ptr; | |
a1ab4c31 | 3544 | |
aeecf17c | 3545 | /* Now adjust them. */ |
a1ab4c31 | 3546 | for (; ptr; ptr = TYPE_NEXT_PTR_TO (ptr)) |
aeecf17c EB |
3547 | for (t = TYPE_MAIN_VARIANT (ptr); t; t = TYPE_NEXT_VARIANT (t)) |
3548 | TREE_TYPE (t) = new_type; | |
de9528f0 EB |
3549 | |
3550 | /* If we have adjusted named types, finalize them. This is necessary | |
3551 | since we had forced a DWARF typedef for them in gnat_pushdecl. */ | |
3552 | for (ptr = TYPE_POINTER_TO (old_type); ptr; ptr = TYPE_NEXT_PTR_TO (ptr)) | |
3553 | if (TYPE_NAME (ptr) && TREE_CODE (TYPE_NAME (ptr)) == TYPE_DECL) | |
3554 | rest_of_type_decl_compilation (TYPE_NAME (ptr)); | |
a1ab4c31 | 3555 | |
aeecf17c EB |
3556 | /* Chain REF and its variants at the end. */ |
3557 | new_ref = TYPE_REFERENCE_TO (new_type); | |
3558 | if (new_ref) | |
3559 | { | |
3560 | while (TYPE_NEXT_REF_TO (new_ref)) | |
3561 | new_ref = TYPE_NEXT_REF_TO (new_ref); | |
3562 | TYPE_NEXT_REF_TO (new_ref) = ref; | |
3563 | } | |
3564 | else | |
3565 | TYPE_REFERENCE_TO (new_type) = ref; | |
3566 | ||
3567 | /* Now adjust them. */ | |
a1ab4c31 | 3568 | for (; ref; ref = TYPE_NEXT_REF_TO (ref)) |
aeecf17c EB |
3569 | for (t = TYPE_MAIN_VARIANT (ref); t; t = TYPE_NEXT_VARIANT (t)) |
3570 | TREE_TYPE (t) = new_type; | |
de9528f0 EB |
3571 | |
3572 | TYPE_POINTER_TO (old_type) = NULL_TREE; | |
3bd6ca3f | 3573 | TYPE_REFERENCE_TO (old_type) = NULL_TREE; |
a1ab4c31 AC |
3574 | } |
3575 | ||
aeecf17c EB |
3576 | /* Now deal with the unconstrained array case. In this case the pointer |
3577 | is actually a record where both fields are pointers to dummy nodes. | |
e3edbd56 EB |
3578 | Turn them into pointers to the correct types using update_pointer_to. |
3579 | Likewise for the pointer to the object record (thin pointer). */ | |
a1ab4c31 AC |
3580 | else |
3581 | { | |
e3edbd56 | 3582 | tree new_ptr = TYPE_POINTER_TO (new_type); |
aeecf17c EB |
3583 | |
3584 | gcc_assert (TYPE_IS_FAT_POINTER_P (ptr)); | |
3585 | ||
e3edbd56 | 3586 | /* If PTR already points to NEW_TYPE, nothing to do. This can happen |
aeecf17c EB |
3587 | since update_pointer_to can be invoked multiple times on the same |
3588 | couple of types because of the type variants. */ | |
3589 | if (TYPE_UNCONSTRAINED_ARRAY (ptr) == new_type) | |
3590 | return; | |
3591 | ||
a1ab4c31 | 3592 | update_pointer_to |
e3edbd56 EB |
3593 | (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (ptr))), |
3594 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS (new_ptr)))); | |
a1ab4c31 | 3595 | |
a1ab4c31 | 3596 | update_pointer_to |
e3edbd56 EB |
3597 | (TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (ptr)))), |
3598 | TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (new_ptr))))); | |
aeecf17c | 3599 | |
e3edbd56 EB |
3600 | update_pointer_to (TYPE_OBJECT_RECORD_TYPE (old_type), |
3601 | TYPE_OBJECT_RECORD_TYPE (new_type)); | |
a1ab4c31 | 3602 | |
e3edbd56 | 3603 | TYPE_POINTER_TO (old_type) = NULL_TREE; |
a1ab4c31 AC |
3604 | } |
3605 | } | |
3606 | \f | |
8df2e902 EB |
3607 | /* Convert EXPR, a pointer to a constrained array, into a pointer to an |
3608 | unconstrained one. This involves making or finding a template. */ | |
a1ab4c31 AC |
3609 | |
3610 | static tree | |
3611 | convert_to_fat_pointer (tree type, tree expr) | |
3612 | { | |
910ad8de | 3613 | tree template_type = TREE_TYPE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type)))); |
8df2e902 | 3614 | tree p_array_type = TREE_TYPE (TYPE_FIELDS (type)); |
a1ab4c31 | 3615 | tree etype = TREE_TYPE (expr); |
6bf68a93 | 3616 | tree template_tree; |
0e228dd9 | 3617 | VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 2); |
a1ab4c31 | 3618 | |
8df2e902 EB |
3619 | /* If EXPR is null, make a fat pointer that contains null pointers to the |
3620 | template and array. */ | |
a1ab4c31 | 3621 | if (integer_zerop (expr)) |
0e228dd9 NF |
3622 | { |
3623 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), | |
3624 | convert (p_array_type, expr)); | |
910ad8de | 3625 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), |
0e228dd9 NF |
3626 | convert (build_pointer_type (template_type), |
3627 | expr)); | |
3628 | return gnat_build_constructor (type, v); | |
3629 | } | |
a1ab4c31 | 3630 | |
8df2e902 | 3631 | /* If EXPR is a thin pointer, make template and data from the record.. */ |
315cff15 | 3632 | else if (TYPE_IS_THIN_POINTER_P (etype)) |
a1ab4c31 AC |
3633 | { |
3634 | tree fields = TYPE_FIELDS (TREE_TYPE (etype)); | |
3635 | ||
7d7a1fe8 | 3636 | expr = gnat_protect_expr (expr); |
a1ab4c31 AC |
3637 | if (TREE_CODE (expr) == ADDR_EXPR) |
3638 | expr = TREE_OPERAND (expr, 0); | |
3639 | else | |
3640 | expr = build1 (INDIRECT_REF, TREE_TYPE (etype), expr); | |
3641 | ||
6bf68a93 | 3642 | template_tree = build_component_ref (expr, NULL_TREE, fields, false); |
a1ab4c31 AC |
3643 | expr = build_unary_op (ADDR_EXPR, NULL_TREE, |
3644 | build_component_ref (expr, NULL_TREE, | |
910ad8de | 3645 | DECL_CHAIN (fields), false)); |
a1ab4c31 | 3646 | } |
8df2e902 EB |
3647 | |
3648 | /* Otherwise, build the constructor for the template. */ | |
a1ab4c31 | 3649 | else |
6bf68a93 | 3650 | template_tree = build_template (template_type, TREE_TYPE (etype), expr); |
a1ab4c31 | 3651 | |
8df2e902 | 3652 | /* The final result is a constructor for the fat pointer. |
a1ab4c31 | 3653 | |
8df2e902 EB |
3654 | If EXPR is an argument of a foreign convention subprogram, the type it |
3655 | points to is directly the component type. In this case, the expression | |
a1ab4c31 | 3656 | type may not match the corresponding FIELD_DECL type at this point, so we |
8df2e902 | 3657 | call "convert" here to fix that up if necessary. This type consistency is |
a1ab4c31 | 3658 | required, for instance because it ensures that possible later folding of |
8df2e902 | 3659 | COMPONENT_REFs against this constructor always yields something of the |
a1ab4c31 AC |
3660 | same type as the initial reference. |
3661 | ||
8df2e902 EB |
3662 | Note that the call to "build_template" above is still fine because it |
3663 | will only refer to the provided TEMPLATE_TYPE in this case. */ | |
0e228dd9 NF |
3664 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
3665 | convert (p_array_type, expr)); | |
910ad8de | 3666 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), |
0e228dd9 NF |
3667 | build_unary_op (ADDR_EXPR, NULL_TREE, |
3668 | template_tree)); | |
3669 | return gnat_build_constructor (type, v); | |
a1ab4c31 AC |
3670 | } |
3671 | \f | |
3672 | /* Convert to a thin pointer type, TYPE. The only thing we know how to convert | |
3673 | is something that is a fat pointer, so convert to it first if it EXPR | |
3674 | is not already a fat pointer. */ | |
3675 | ||
3676 | static tree | |
3677 | convert_to_thin_pointer (tree type, tree expr) | |
3678 | { | |
315cff15 | 3679 | if (!TYPE_IS_FAT_POINTER_P (TREE_TYPE (expr))) |
a1ab4c31 AC |
3680 | expr |
3681 | = convert_to_fat_pointer | |
3682 | (TREE_TYPE (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))), expr); | |
3683 | ||
3684 | /* We get the pointer to the data and use a NOP_EXPR to make it the | |
3685 | proper GCC type. */ | |
3686 | expr = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (TREE_TYPE (expr)), | |
3687 | false); | |
3688 | expr = build1 (NOP_EXPR, type, expr); | |
3689 | ||
3690 | return expr; | |
3691 | } | |
3692 | \f | |
3693 | /* Create an expression whose value is that of EXPR, | |
3694 | converted to type TYPE. The TREE_TYPE of the value | |
3695 | is always TYPE. This function implements all reasonable | |
3696 | conversions; callers should filter out those that are | |
3697 | not permitted by the language being compiled. */ | |
3698 | ||
3699 | tree | |
3700 | convert (tree type, tree expr) | |
3701 | { | |
a1ab4c31 AC |
3702 | tree etype = TREE_TYPE (expr); |
3703 | enum tree_code ecode = TREE_CODE (etype); | |
c34f3839 | 3704 | enum tree_code code = TREE_CODE (type); |
a1ab4c31 | 3705 | |
c34f3839 EB |
3706 | /* If the expression is already of the right type, we are done. */ |
3707 | if (etype == type) | |
a1ab4c31 AC |
3708 | return expr; |
3709 | ||
3710 | /* If both input and output have padding and are of variable size, do this | |
3711 | as an unchecked conversion. Likewise if one is a mere variant of the | |
3712 | other, so we avoid a pointless unpad/repad sequence. */ | |
3713 | else if (code == RECORD_TYPE && ecode == RECORD_TYPE | |
315cff15 | 3714 | && TYPE_PADDING_P (type) && TYPE_PADDING_P (etype) |
a1ab4c31 AC |
3715 | && (!TREE_CONSTANT (TYPE_SIZE (type)) |
3716 | || !TREE_CONSTANT (TYPE_SIZE (etype)) | |
3717 | || gnat_types_compatible_p (type, etype) | |
3718 | || TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type))) | |
3719 | == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (etype))))) | |
3720 | ; | |
3721 | ||
f88facfe EB |
3722 | /* If the output type has padding, convert to the inner type and make a |
3723 | constructor to build the record, unless a variable size is involved. */ | |
315cff15 | 3724 | else if (code == RECORD_TYPE && TYPE_PADDING_P (type)) |
a1ab4c31 | 3725 | { |
0e228dd9 NF |
3726 | VEC(constructor_elt,gc) *v; |
3727 | ||
a1ab4c31 AC |
3728 | /* If we previously converted from another type and our type is |
3729 | of variable size, remove the conversion to avoid the need for | |
f88facfe | 3730 | variable-sized temporaries. Likewise for a conversion between |
a1ab4c31 AC |
3731 | original and packable version. */ |
3732 | if (TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
3733 | && (!TREE_CONSTANT (TYPE_SIZE (type)) | |
3734 | || (ecode == RECORD_TYPE | |
3735 | && TYPE_NAME (etype) | |
3736 | == TYPE_NAME (TREE_TYPE (TREE_OPERAND (expr, 0)))))) | |
3737 | expr = TREE_OPERAND (expr, 0); | |
3738 | ||
3739 | /* If we are just removing the padding from expr, convert the original | |
3740 | object if we have variable size in order to avoid the need for some | |
f88facfe | 3741 | variable-sized temporaries. Likewise if the padding is a variant |
a1ab4c31 AC |
3742 | of the other, so we avoid a pointless unpad/repad sequence. */ |
3743 | if (TREE_CODE (expr) == COMPONENT_REF | |
a1ab4c31 AC |
3744 | && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (expr, 0))) |
3745 | && (!TREE_CONSTANT (TYPE_SIZE (type)) | |
3746 | || gnat_types_compatible_p (type, | |
3747 | TREE_TYPE (TREE_OPERAND (expr, 0))) | |
3748 | || (ecode == RECORD_TYPE | |
3749 | && TYPE_NAME (etype) | |
3750 | == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type)))))) | |
3751 | return convert (type, TREE_OPERAND (expr, 0)); | |
3752 | ||
431cfac1 EB |
3753 | /* If the inner type is of self-referential size and the expression type |
3754 | is a record, do this as an unchecked conversion. But first pad the | |
3755 | expression if possible to have the same size on both sides. */ | |
c34f3839 | 3756 | if (ecode == RECORD_TYPE |
f88facfe | 3757 | && CONTAINS_PLACEHOLDER_P (DECL_SIZE (TYPE_FIELDS (type)))) |
431cfac1 | 3758 | { |
980a0501 | 3759 | if (TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST) |
431cfac1 | 3760 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, |
980a0501 EB |
3761 | false, false, false, true), |
3762 | expr); | |
431cfac1 EB |
3763 | return unchecked_convert (type, expr, false); |
3764 | } | |
a1ab4c31 | 3765 | |
f88facfe EB |
3766 | /* If we are converting between array types with variable size, do the |
3767 | final conversion as an unchecked conversion, again to avoid the need | |
3768 | for some variable-sized temporaries. If valid, this conversion is | |
3769 | very likely purely technical and without real effects. */ | |
c34f3839 | 3770 | if (ecode == ARRAY_TYPE |
f88facfe EB |
3771 | && TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == ARRAY_TYPE |
3772 | && !TREE_CONSTANT (TYPE_SIZE (etype)) | |
3773 | && !TREE_CONSTANT (TYPE_SIZE (type))) | |
3774 | return unchecked_convert (type, | |
3775 | convert (TREE_TYPE (TYPE_FIELDS (type)), | |
3776 | expr), | |
3777 | false); | |
3778 | ||
0e228dd9 NF |
3779 | v = VEC_alloc (constructor_elt, gc, 1); |
3780 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), | |
3781 | convert (TREE_TYPE (TYPE_FIELDS (type)), expr)); | |
3782 | return gnat_build_constructor (type, v); | |
a1ab4c31 AC |
3783 | } |
3784 | ||
3785 | /* If the input type has padding, remove it and convert to the output type. | |
3786 | The conditions ordering is arranged to ensure that the output type is not | |
3787 | a padding type here, as it is not clear whether the conversion would | |
3788 | always be correct if this was to happen. */ | |
315cff15 | 3789 | else if (ecode == RECORD_TYPE && TYPE_PADDING_P (etype)) |
a1ab4c31 AC |
3790 | { |
3791 | tree unpadded; | |
3792 | ||
3793 | /* If we have just converted to this padded type, just get the | |
3794 | inner expression. */ | |
3795 | if (TREE_CODE (expr) == CONSTRUCTOR | |
3796 | && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (expr)) | |
3797 | && VEC_index (constructor_elt, CONSTRUCTOR_ELTS (expr), 0)->index | |
3798 | == TYPE_FIELDS (etype)) | |
3799 | unpadded | |
3800 | = VEC_index (constructor_elt, CONSTRUCTOR_ELTS (expr), 0)->value; | |
3801 | ||
3802 | /* Otherwise, build an explicit component reference. */ | |
3803 | else | |
3804 | unpadded | |
3805 | = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (etype), false); | |
3806 | ||
3807 | return convert (type, unpadded); | |
3808 | } | |
3809 | ||
3810 | /* If the input is a biased type, adjust first. */ | |
3811 | if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype)) | |
3812 | return convert (type, fold_build2 (PLUS_EXPR, TREE_TYPE (etype), | |
3813 | fold_convert (TREE_TYPE (etype), | |
3814 | expr), | |
3815 | TYPE_MIN_VALUE (etype))); | |
3816 | ||
3817 | /* If the input is a justified modular type, we need to extract the actual | |
3818 | object before converting it to any other type with the exceptions of an | |
3819 | unconstrained array or of a mere type variant. It is useful to avoid the | |
3820 | extraction and conversion in the type variant case because it could end | |
3821 | up replacing a VAR_DECL expr by a constructor and we might be about the | |
3822 | take the address of the result. */ | |
3823 | if (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype) | |
3824 | && code != UNCONSTRAINED_ARRAY_TYPE | |
3825 | && TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (etype)) | |
3826 | return convert (type, build_component_ref (expr, NULL_TREE, | |
3827 | TYPE_FIELDS (etype), false)); | |
3828 | ||
3829 | /* If converting to a type that contains a template, convert to the data | |
3830 | type and then build the template. */ | |
3831 | if (code == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (type)) | |
3832 | { | |
910ad8de | 3833 | tree obj_type = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (type))); |
0e228dd9 | 3834 | VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 2); |
a1ab4c31 AC |
3835 | |
3836 | /* If the source already has a template, get a reference to the | |
3837 | associated array only, as we are going to rebuild a template | |
3838 | for the target type anyway. */ | |
3839 | expr = maybe_unconstrained_array (expr); | |
3840 | ||
0e228dd9 NF |
3841 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), |
3842 | build_template (TREE_TYPE (TYPE_FIELDS (type)), | |
3843 | obj_type, NULL_TREE)); | |
910ad8de | 3844 | CONSTRUCTOR_APPEND_ELT (v, DECL_CHAIN (TYPE_FIELDS (type)), |
0e228dd9 NF |
3845 | convert (obj_type, expr)); |
3846 | return gnat_build_constructor (type, v); | |
a1ab4c31 AC |
3847 | } |
3848 | ||
3849 | /* There are some special cases of expressions that we process | |
3850 | specially. */ | |
3851 | switch (TREE_CODE (expr)) | |
3852 | { | |
3853 | case ERROR_MARK: | |
3854 | return expr; | |
3855 | ||
3856 | case NULL_EXPR: | |
3857 | /* Just set its type here. For TRANSFORM_EXPR, we will do the actual | |
3858 | conversion in gnat_expand_expr. NULL_EXPR does not represent | |
3859 | and actual value, so no conversion is needed. */ | |
3860 | expr = copy_node (expr); | |
3861 | TREE_TYPE (expr) = type; | |
3862 | return expr; | |
3863 | ||
3864 | case STRING_CST: | |
3865 | /* If we are converting a STRING_CST to another constrained array type, | |
3866 | just make a new one in the proper type. */ | |
3867 | if (code == ecode && AGGREGATE_TYPE_P (etype) | |
3868 | && !(TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST | |
3869 | && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)) | |
3870 | { | |
3871 | expr = copy_node (expr); | |
3872 | TREE_TYPE (expr) = type; | |
3873 | return expr; | |
3874 | } | |
3875 | break; | |
3876 | ||
7948ae37 OH |
3877 | case VECTOR_CST: |
3878 | /* If we are converting a VECTOR_CST to a mere variant type, just make | |
3879 | a new one in the proper type. */ | |
3880 | if (code == ecode && gnat_types_compatible_p (type, etype)) | |
3881 | { | |
3882 | expr = copy_node (expr); | |
3883 | TREE_TYPE (expr) = type; | |
3884 | return expr; | |
3885 | } | |
3886 | ||
a1ab4c31 AC |
3887 | case CONSTRUCTOR: |
3888 | /* If we are converting a CONSTRUCTOR to a mere variant type, just make | |
3889 | a new one in the proper type. */ | |
3890 | if (code == ecode && gnat_types_compatible_p (type, etype)) | |
3891 | { | |
3892 | expr = copy_node (expr); | |
3893 | TREE_TYPE (expr) = type; | |
3894 | return expr; | |
3895 | } | |
3896 | ||
cb3d597d EB |
3897 | /* Likewise for a conversion between original and packable version, or |
3898 | conversion between types of the same size and with the same list of | |
3899 | fields, but we have to work harder to preserve type consistency. */ | |
a1ab4c31 AC |
3900 | if (code == ecode |
3901 | && code == RECORD_TYPE | |
cb3d597d EB |
3902 | && (TYPE_NAME (type) == TYPE_NAME (etype) |
3903 | || tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (etype)))) | |
3904 | ||
a1ab4c31 AC |
3905 | { |
3906 | VEC(constructor_elt,gc) *e = CONSTRUCTOR_ELTS (expr); | |
3907 | unsigned HOST_WIDE_INT len = VEC_length (constructor_elt, e); | |
3908 | VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, len); | |
3909 | tree efield = TYPE_FIELDS (etype), field = TYPE_FIELDS (type); | |
3910 | unsigned HOST_WIDE_INT idx; | |
3911 | tree index, value; | |
3912 | ||
db868e1e OH |
3913 | /* Whether we need to clear TREE_CONSTANT et al. on the output |
3914 | constructor when we convert in place. */ | |
3915 | bool clear_constant = false; | |
3916 | ||
a1ab4c31 AC |
3917 | FOR_EACH_CONSTRUCTOR_ELT(e, idx, index, value) |
3918 | { | |
cb3d597d EB |
3919 | constructor_elt *elt; |
3920 | /* We expect only simple constructors. */ | |
3921 | if (!SAME_FIELD_P (index, efield)) | |
3922 | break; | |
3923 | /* The field must be the same. */ | |
3924 | if (!SAME_FIELD_P (efield, field)) | |
a1ab4c31 | 3925 | break; |
cb3d597d | 3926 | elt = VEC_quick_push (constructor_elt, v, NULL); |
a1ab4c31 AC |
3927 | elt->index = field; |
3928 | elt->value = convert (TREE_TYPE (field), value); | |
db868e1e OH |
3929 | |
3930 | /* If packing has made this field a bitfield and the input | |
3931 | value couldn't be emitted statically any more, we need to | |
3932 | clear TREE_CONSTANT on our output. */ | |
ced57283 EB |
3933 | if (!clear_constant |
3934 | && TREE_CONSTANT (expr) | |
db868e1e OH |
3935 | && !CONSTRUCTOR_BITFIELD_P (efield) |
3936 | && CONSTRUCTOR_BITFIELD_P (field) | |
3937 | && !initializer_constant_valid_for_bitfield_p (value)) | |
3938 | clear_constant = true; | |
3939 | ||
910ad8de NF |
3940 | efield = DECL_CHAIN (efield); |
3941 | field = DECL_CHAIN (field); | |
a1ab4c31 AC |
3942 | } |
3943 | ||
db868e1e OH |
3944 | /* If we have been able to match and convert all the input fields |
3945 | to their output type, convert in place now. We'll fallback to a | |
3946 | view conversion downstream otherwise. */ | |
a1ab4c31 AC |
3947 | if (idx == len) |
3948 | { | |
3949 | expr = copy_node (expr); | |
3950 | TREE_TYPE (expr) = type; | |
3951 | CONSTRUCTOR_ELTS (expr) = v; | |
db868e1e | 3952 | if (clear_constant) |
ced57283 | 3953 | TREE_CONSTANT (expr) = TREE_STATIC (expr) = 0; |
a1ab4c31 AC |
3954 | return expr; |
3955 | } | |
3956 | } | |
7948ae37 OH |
3957 | |
3958 | /* Likewise for a conversion between array type and vector type with a | |
3959 | compatible representative array. */ | |
3960 | else if (code == VECTOR_TYPE | |
3961 | && ecode == ARRAY_TYPE | |
3962 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), | |
3963 | etype)) | |
3964 | { | |
3965 | VEC(constructor_elt,gc) *e = CONSTRUCTOR_ELTS (expr); | |
3966 | unsigned HOST_WIDE_INT len = VEC_length (constructor_elt, e); | |
3967 | VEC(constructor_elt,gc) *v; | |
3968 | unsigned HOST_WIDE_INT ix; | |
3969 | tree value; | |
3970 | ||
3971 | /* Build a VECTOR_CST from a *constant* array constructor. */ | |
3972 | if (TREE_CONSTANT (expr)) | |
3973 | { | |
3974 | bool constant_p = true; | |
3975 | ||
3976 | /* Iterate through elements and check if all constructor | |
3977 | elements are *_CSTs. */ | |
3978 | FOR_EACH_CONSTRUCTOR_VALUE (e, ix, value) | |
3979 | if (!CONSTANT_CLASS_P (value)) | |
3980 | { | |
3981 | constant_p = false; | |
3982 | break; | |
3983 | } | |
3984 | ||
3985 | if (constant_p) | |
3986 | return build_vector_from_ctor (type, | |
3987 | CONSTRUCTOR_ELTS (expr)); | |
3988 | } | |
3989 | ||
3990 | /* Otherwise, build a regular vector constructor. */ | |
3991 | v = VEC_alloc (constructor_elt, gc, len); | |
3992 | FOR_EACH_CONSTRUCTOR_VALUE (e, ix, value) | |
3993 | { | |
3994 | constructor_elt *elt = VEC_quick_push (constructor_elt, v, NULL); | |
3995 | elt->index = NULL_TREE; | |
3996 | elt->value = value; | |
3997 | } | |
3998 | expr = copy_node (expr); | |
3999 | TREE_TYPE (expr) = type; | |
4000 | CONSTRUCTOR_ELTS (expr) = v; | |
4001 | return expr; | |
4002 | } | |
a1ab4c31 AC |
4003 | break; |
4004 | ||
4005 | case UNCONSTRAINED_ARRAY_REF: | |
4006 | /* Convert this to the type of the inner array by getting the address of | |
4007 | the array from the template. */ | |
86060344 | 4008 | expr = TREE_OPERAND (expr, 0); |
a1ab4c31 | 4009 | expr = build_unary_op (INDIRECT_REF, NULL_TREE, |
86060344 EB |
4010 | build_component_ref (expr, NULL_TREE, |
4011 | TYPE_FIELDS | |
4012 | (TREE_TYPE (expr)), | |
4013 | false)); | |
a1ab4c31 AC |
4014 | etype = TREE_TYPE (expr); |
4015 | ecode = TREE_CODE (etype); | |
4016 | break; | |
4017 | ||
4018 | case VIEW_CONVERT_EXPR: | |
4019 | { | |
4020 | /* GCC 4.x is very sensitive to type consistency overall, and view | |
4021 | conversions thus are very frequent. Even though just "convert"ing | |
4022 | the inner operand to the output type is fine in most cases, it | |
4023 | might expose unexpected input/output type mismatches in special | |
4024 | circumstances so we avoid such recursive calls when we can. */ | |
4025 | tree op0 = TREE_OPERAND (expr, 0); | |
4026 | ||
4027 | /* If we are converting back to the original type, we can just | |
4028 | lift the input conversion. This is a common occurrence with | |
4029 | switches back-and-forth amongst type variants. */ | |
4030 | if (type == TREE_TYPE (op0)) | |
4031 | return op0; | |
4032 | ||
7948ae37 OH |
4033 | /* Otherwise, if we're converting between two aggregate or vector |
4034 | types, we might be allowed to substitute the VIEW_CONVERT_EXPR | |
4035 | target type in place or to just convert the inner expression. */ | |
4036 | if ((AGGREGATE_TYPE_P (type) && AGGREGATE_TYPE_P (etype)) | |
4037 | || (VECTOR_TYPE_P (type) && VECTOR_TYPE_P (etype))) | |
a1ab4c31 AC |
4038 | { |
4039 | /* If we are converting between mere variants, we can just | |
4040 | substitute the VIEW_CONVERT_EXPR in place. */ | |
4041 | if (gnat_types_compatible_p (type, etype)) | |
4042 | return build1 (VIEW_CONVERT_EXPR, type, op0); | |
4043 | ||
4044 | /* Otherwise, we may just bypass the input view conversion unless | |
4045 | one of the types is a fat pointer, which is handled by | |
4046 | specialized code below which relies on exact type matching. */ | |
315cff15 EB |
4047 | else if (!TYPE_IS_FAT_POINTER_P (type) |
4048 | && !TYPE_IS_FAT_POINTER_P (etype)) | |
a1ab4c31 AC |
4049 | return convert (type, op0); |
4050 | } | |
4051 | } | |
4052 | break; | |
4053 | ||
a1ab4c31 AC |
4054 | default: |
4055 | break; | |
4056 | } | |
4057 | ||
4058 | /* Check for converting to a pointer to an unconstrained array. */ | |
315cff15 | 4059 | if (TYPE_IS_FAT_POINTER_P (type) && !TYPE_IS_FAT_POINTER_P (etype)) |
a1ab4c31 AC |
4060 | return convert_to_fat_pointer (type, expr); |
4061 | ||
7948ae37 OH |
4062 | /* If we are converting between two aggregate or vector types that are mere |
4063 | variants, just make a VIEW_CONVERT_EXPR. Likewise when we are converting | |
4064 | to a vector type from its representative array type. */ | |
4065 | else if ((code == ecode | |
4066 | && (AGGREGATE_TYPE_P (type) || VECTOR_TYPE_P (type)) | |
4067 | && gnat_types_compatible_p (type, etype)) | |
4068 | || (code == VECTOR_TYPE | |
4069 | && ecode == ARRAY_TYPE | |
4070 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), | |
4071 | etype))) | |
a1ab4c31 AC |
4072 | return build1 (VIEW_CONVERT_EXPR, type, expr); |
4073 | ||
76af763d EB |
4074 | /* If we are converting between tagged types, try to upcast properly. */ |
4075 | else if (ecode == RECORD_TYPE && code == RECORD_TYPE | |
4076 | && TYPE_ALIGN_OK (etype) && TYPE_ALIGN_OK (type)) | |
4077 | { | |
4078 | tree child_etype = etype; | |
4079 | do { | |
4080 | tree field = TYPE_FIELDS (child_etype); | |
4081 | if (DECL_NAME (field) == parent_name_id && TREE_TYPE (field) == type) | |
4082 | return build_component_ref (expr, NULL_TREE, field, false); | |
4083 | child_etype = TREE_TYPE (field); | |
4084 | } while (TREE_CODE (child_etype) == RECORD_TYPE); | |
4085 | } | |
4086 | ||
bb1f7929 EB |
4087 | /* If we are converting from a smaller form of record type back to it, just |
4088 | make a VIEW_CONVERT_EXPR. But first pad the expression to have the same | |
4089 | size on both sides. */ | |
4090 | else if (ecode == RECORD_TYPE && code == RECORD_TYPE | |
4091 | && smaller_form_type_p (etype, type)) | |
4092 | { | |
4093 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, | |
4094 | false, false, false, true), | |
4095 | expr); | |
4096 | return build1 (VIEW_CONVERT_EXPR, type, expr); | |
4097 | } | |
4098 | ||
a1ab4c31 | 4099 | /* In all other cases of related types, make a NOP_EXPR. */ |
86060344 | 4100 | else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (etype)) |
a1ab4c31 AC |
4101 | return fold_convert (type, expr); |
4102 | ||
4103 | switch (code) | |
4104 | { | |
4105 | case VOID_TYPE: | |
4106 | return fold_build1 (CONVERT_EXPR, type, expr); | |
4107 | ||
a1ab4c31 AC |
4108 | case INTEGER_TYPE: |
4109 | if (TYPE_HAS_ACTUAL_BOUNDS_P (type) | |
4110 | && (ecode == ARRAY_TYPE || ecode == UNCONSTRAINED_ARRAY_TYPE | |
4111 | || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype)))) | |
4112 | return unchecked_convert (type, expr, false); | |
4113 | else if (TYPE_BIASED_REPRESENTATION_P (type)) | |
4114 | return fold_convert (type, | |
4115 | fold_build2 (MINUS_EXPR, TREE_TYPE (type), | |
4116 | convert (TREE_TYPE (type), expr), | |
4117 | TYPE_MIN_VALUE (type))); | |
4118 | ||
4119 | /* ... fall through ... */ | |
4120 | ||
4121 | case ENUMERAL_TYPE: | |
01ddebf2 | 4122 | case BOOLEAN_TYPE: |
a1ab4c31 AC |
4123 | /* If we are converting an additive expression to an integer type |
4124 | with lower precision, be wary of the optimization that can be | |
4125 | applied by convert_to_integer. There are 2 problematic cases: | |
4126 | - if the first operand was originally of a biased type, | |
4127 | because we could be recursively called to convert it | |
4128 | to an intermediate type and thus rematerialize the | |
4129 | additive operator endlessly, | |
4130 | - if the expression contains a placeholder, because an | |
4131 | intermediate conversion that changes the sign could | |
4132 | be inserted and thus introduce an artificial overflow | |
4133 | at compile time when the placeholder is substituted. */ | |
4134 | if (code == INTEGER_TYPE | |
4135 | && ecode == INTEGER_TYPE | |
4136 | && TYPE_PRECISION (type) < TYPE_PRECISION (etype) | |
4137 | && (TREE_CODE (expr) == PLUS_EXPR || TREE_CODE (expr) == MINUS_EXPR)) | |
4138 | { | |
4139 | tree op0 = get_unwidened (TREE_OPERAND (expr, 0), type); | |
4140 | ||
4141 | if ((TREE_CODE (TREE_TYPE (op0)) == INTEGER_TYPE | |
4142 | && TYPE_BIASED_REPRESENTATION_P (TREE_TYPE (op0))) | |
4143 | || CONTAINS_PLACEHOLDER_P (expr)) | |
4144 | return build1 (NOP_EXPR, type, expr); | |
4145 | } | |
4146 | ||
4147 | return fold (convert_to_integer (type, expr)); | |
4148 | ||
4149 | case POINTER_TYPE: | |
4150 | case REFERENCE_TYPE: | |
4151 | /* If converting between two pointers to records denoting | |
4152 | both a template and type, adjust if needed to account | |
4153 | for any differing offsets, since one might be negative. */ | |
315cff15 | 4154 | if (TYPE_IS_THIN_POINTER_P (etype) && TYPE_IS_THIN_POINTER_P (type)) |
a1ab4c31 AC |
4155 | { |
4156 | tree bit_diff | |
4157 | = size_diffop (bit_position (TYPE_FIELDS (TREE_TYPE (etype))), | |
4158 | bit_position (TYPE_FIELDS (TREE_TYPE (type)))); | |
1081f5a7 EB |
4159 | tree byte_diff |
4160 | = size_binop (CEIL_DIV_EXPR, bit_diff, sbitsize_unit_node); | |
a1ab4c31 AC |
4161 | expr = build1 (NOP_EXPR, type, expr); |
4162 | TREE_CONSTANT (expr) = TREE_CONSTANT (TREE_OPERAND (expr, 0)); | |
4163 | if (integer_zerop (byte_diff)) | |
4164 | return expr; | |
4165 | ||
4166 | return build_binary_op (POINTER_PLUS_EXPR, type, expr, | |
4167 | fold (convert (sizetype, byte_diff))); | |
4168 | } | |
4169 | ||
4170 | /* If converting to a thin pointer, handle specially. */ | |
315cff15 | 4171 | if (TYPE_IS_THIN_POINTER_P (type) |
a1ab4c31 AC |
4172 | && TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))) |
4173 | return convert_to_thin_pointer (type, expr); | |
4174 | ||
4175 | /* If converting fat pointer to normal pointer, get the pointer to the | |
4176 | array and then convert it. */ | |
315cff15 | 4177 | else if (TYPE_IS_FAT_POINTER_P (etype)) |
86060344 EB |
4178 | expr |
4179 | = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (etype), false); | |
a1ab4c31 AC |
4180 | |
4181 | return fold (convert_to_pointer (type, expr)); | |
4182 | ||
4183 | case REAL_TYPE: | |
4184 | return fold (convert_to_real (type, expr)); | |
4185 | ||
4186 | case RECORD_TYPE: | |
4187 | if (TYPE_JUSTIFIED_MODULAR_P (type) && !AGGREGATE_TYPE_P (etype)) | |
0e228dd9 NF |
4188 | { |
4189 | VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 1); | |
4190 | ||
4191 | CONSTRUCTOR_APPEND_ELT (v, TYPE_FIELDS (type), | |
4192 | convert (TREE_TYPE (TYPE_FIELDS (type)), | |
4193 | expr)); | |
4194 | return gnat_build_constructor (type, v); | |
4195 | } | |
a1ab4c31 AC |
4196 | |
4197 | /* ... fall through ... */ | |
4198 | ||
4199 | case ARRAY_TYPE: | |
4200 | /* In these cases, assume the front-end has validated the conversion. | |
4201 | If the conversion is valid, it will be a bit-wise conversion, so | |
4202 | it can be viewed as an unchecked conversion. */ | |
4203 | return unchecked_convert (type, expr, false); | |
4204 | ||
4205 | case UNION_TYPE: | |
4206 | /* This is a either a conversion between a tagged type and some | |
4207 | subtype, which we have to mark as a UNION_TYPE because of | |
4208 | overlapping fields or a conversion of an Unchecked_Union. */ | |
4209 | return unchecked_convert (type, expr, false); | |
4210 | ||
4211 | case UNCONSTRAINED_ARRAY_TYPE: | |
7948ae37 OH |
4212 | /* If the input is a VECTOR_TYPE, convert to the representative |
4213 | array type first. */ | |
4214 | if (ecode == VECTOR_TYPE) | |
4215 | { | |
4216 | expr = convert (TYPE_REPRESENTATIVE_ARRAY (etype), expr); | |
4217 | etype = TREE_TYPE (expr); | |
4218 | ecode = TREE_CODE (etype); | |
4219 | } | |
4220 | ||
a1ab4c31 AC |
4221 | /* If EXPR is a constrained array, take its address, convert it to a |
4222 | fat pointer, and then dereference it. Likewise if EXPR is a | |
4223 | record containing both a template and a constrained array. | |
4224 | Note that a record representing a justified modular type | |
4225 | always represents a packed constrained array. */ | |
4226 | if (ecode == ARRAY_TYPE | |
4227 | || (ecode == INTEGER_TYPE && TYPE_HAS_ACTUAL_BOUNDS_P (etype)) | |
4228 | || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype)) | |
4229 | || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype))) | |
4230 | return | |
4231 | build_unary_op | |
4232 | (INDIRECT_REF, NULL_TREE, | |
4233 | convert_to_fat_pointer (TREE_TYPE (type), | |
4234 | build_unary_op (ADDR_EXPR, | |
4235 | NULL_TREE, expr))); | |
4236 | ||
4237 | /* Do something very similar for converting one unconstrained | |
4238 | array to another. */ | |
4239 | else if (ecode == UNCONSTRAINED_ARRAY_TYPE) | |
4240 | return | |
4241 | build_unary_op (INDIRECT_REF, NULL_TREE, | |
4242 | convert (TREE_TYPE (type), | |
4243 | build_unary_op (ADDR_EXPR, | |
4244 | NULL_TREE, expr))); | |
4245 | else | |
4246 | gcc_unreachable (); | |
4247 | ||
4248 | case COMPLEX_TYPE: | |
4249 | return fold (convert_to_complex (type, expr)); | |
4250 | ||
4251 | default: | |
4252 | gcc_unreachable (); | |
4253 | } | |
4254 | } | |
4255 | \f | |
4256 | /* Remove all conversions that are done in EXP. This includes converting | |
4257 | from a padded type or to a justified modular type. If TRUE_ADDRESS | |
4258 | is true, always return the address of the containing object even if | |
4259 | the address is not bit-aligned. */ | |
4260 | ||
4261 | tree | |
4262 | remove_conversions (tree exp, bool true_address) | |
4263 | { | |
4264 | switch (TREE_CODE (exp)) | |
4265 | { | |
4266 | case CONSTRUCTOR: | |
4267 | if (true_address | |
4268 | && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE | |
4269 | && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (exp))) | |
4270 | return | |
4271 | remove_conversions (VEC_index (constructor_elt, | |
4272 | CONSTRUCTOR_ELTS (exp), 0)->value, | |
4273 | true); | |
4274 | break; | |
4275 | ||
4276 | case COMPONENT_REF: | |
315cff15 | 4277 | if (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
a1ab4c31 AC |
4278 | return remove_conversions (TREE_OPERAND (exp, 0), true_address); |
4279 | break; | |
4280 | ||
4281 | case VIEW_CONVERT_EXPR: case NON_LVALUE_EXPR: | |
4282 | CASE_CONVERT: | |
4283 | return remove_conversions (TREE_OPERAND (exp, 0), true_address); | |
4284 | ||
4285 | default: | |
4286 | break; | |
4287 | } | |
4288 | ||
4289 | return exp; | |
4290 | } | |
4291 | \f | |
4292 | /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that | |
86060344 | 4293 | refers to the underlying array. If it has TYPE_CONTAINS_TEMPLATE_P, |
a1ab4c31 AC |
4294 | likewise return an expression pointing to the underlying array. */ |
4295 | ||
4296 | tree | |
4297 | maybe_unconstrained_array (tree exp) | |
4298 | { | |
4299 | enum tree_code code = TREE_CODE (exp); | |
c6bd4220 | 4300 | tree new_exp; |
a1ab4c31 AC |
4301 | |
4302 | switch (TREE_CODE (TREE_TYPE (exp))) | |
4303 | { | |
4304 | case UNCONSTRAINED_ARRAY_TYPE: | |
4305 | if (code == UNCONSTRAINED_ARRAY_REF) | |
4306 | { | |
86060344 | 4307 | new_exp = TREE_OPERAND (exp, 0); |
c6bd4220 | 4308 | new_exp |
a1ab4c31 | 4309 | = build_unary_op (INDIRECT_REF, NULL_TREE, |
86060344 EB |
4310 | build_component_ref (new_exp, NULL_TREE, |
4311 | TYPE_FIELDS | |
4312 | (TREE_TYPE (new_exp)), | |
4313 | false)); | |
ced57283 | 4314 | TREE_READONLY (new_exp) = TREE_READONLY (exp); |
c6bd4220 | 4315 | return new_exp; |
a1ab4c31 AC |
4316 | } |
4317 | ||
4318 | else if (code == NULL_EXPR) | |
4319 | return build1 (NULL_EXPR, | |
4320 | TREE_TYPE (TREE_TYPE (TYPE_FIELDS | |
4321 | (TREE_TYPE (TREE_TYPE (exp))))), | |
4322 | TREE_OPERAND (exp, 0)); | |
4323 | ||
4324 | case RECORD_TYPE: | |
4325 | /* If this is a padded type, convert to the unpadded type and see if | |
4326 | it contains a template. */ | |
315cff15 | 4327 | if (TYPE_PADDING_P (TREE_TYPE (exp))) |
a1ab4c31 | 4328 | { |
c6bd4220 EB |
4329 | new_exp = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp); |
4330 | if (TREE_CODE (TREE_TYPE (new_exp)) == RECORD_TYPE | |
4331 | && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (new_exp))) | |
a1ab4c31 | 4332 | return |
c6bd4220 | 4333 | build_component_ref (new_exp, NULL_TREE, |
910ad8de | 4334 | DECL_CHAIN |
c6bd4220 | 4335 | (TYPE_FIELDS (TREE_TYPE (new_exp))), |
3cd64bab | 4336 | false); |
a1ab4c31 AC |
4337 | } |
4338 | else if (TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (exp))) | |
4339 | return | |
4340 | build_component_ref (exp, NULL_TREE, | |
910ad8de | 4341 | DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (exp))), |
3cd64bab | 4342 | false); |
a1ab4c31 AC |
4343 | break; |
4344 | ||
4345 | default: | |
4346 | break; | |
4347 | } | |
4348 | ||
4349 | return exp; | |
4350 | } | |
7948ae37 OH |
4351 | |
4352 | /* If EXP's type is a VECTOR_TYPE, return EXP converted to the associated | |
4353 | TYPE_REPRESENTATIVE_ARRAY. */ | |
4354 | ||
4355 | tree | |
4356 | maybe_vector_array (tree exp) | |
4357 | { | |
4358 | tree etype = TREE_TYPE (exp); | |
4359 | ||
4360 | if (VECTOR_TYPE_P (etype)) | |
4361 | exp = convert (TYPE_REPRESENTATIVE_ARRAY (etype), exp); | |
4362 | ||
4363 | return exp; | |
4364 | } | |
a1ab4c31 | 4365 | \f |
afcea859 | 4366 | /* Return true if EXPR is an expression that can be folded as an operand |
84fb43a1 | 4367 | of a VIEW_CONVERT_EXPR. See ada-tree.h for a complete rationale. */ |
afcea859 EB |
4368 | |
4369 | static bool | |
4370 | can_fold_for_view_convert_p (tree expr) | |
4371 | { | |
4372 | tree t1, t2; | |
4373 | ||
4374 | /* The folder will fold NOP_EXPRs between integral types with the same | |
4375 | precision (in the middle-end's sense). We cannot allow it if the | |
4376 | types don't have the same precision in the Ada sense as well. */ | |
4377 | if (TREE_CODE (expr) != NOP_EXPR) | |
4378 | return true; | |
4379 | ||
4380 | t1 = TREE_TYPE (expr); | |
4381 | t2 = TREE_TYPE (TREE_OPERAND (expr, 0)); | |
4382 | ||
4383 | /* Defer to the folder for non-integral conversions. */ | |
4384 | if (!(INTEGRAL_TYPE_P (t1) && INTEGRAL_TYPE_P (t2))) | |
4385 | return true; | |
4386 | ||
4387 | /* Only fold conversions that preserve both precisions. */ | |
4388 | if (TYPE_PRECISION (t1) == TYPE_PRECISION (t2) | |
4389 | && operand_equal_p (rm_size (t1), rm_size (t2), 0)) | |
4390 | return true; | |
4391 | ||
4392 | return false; | |
4393 | } | |
4394 | ||
a1ab4c31 | 4395 | /* Return an expression that does an unchecked conversion of EXPR to TYPE. |
afcea859 EB |
4396 | If NOTRUNC_P is true, truncation operations should be suppressed. |
4397 | ||
4398 | Special care is required with (source or target) integral types whose | |
4399 | precision is not equal to their size, to make sure we fetch or assign | |
4400 | the value bits whose location might depend on the endianness, e.g. | |
4401 | ||
4402 | Rmsize : constant := 8; | |
4403 | subtype Int is Integer range 0 .. 2 ** Rmsize - 1; | |
4404 | ||
4405 | type Bit_Array is array (1 .. Rmsize) of Boolean; | |
4406 | pragma Pack (Bit_Array); | |
4407 | ||
4408 | function To_Bit_Array is new Unchecked_Conversion (Int, Bit_Array); | |
4409 | ||
4410 | Value : Int := 2#1000_0001#; | |
4411 | Vbits : Bit_Array := To_Bit_Array (Value); | |
4412 | ||
4413 | we expect the 8 bits at Vbits'Address to always contain Value, while | |
4414 | their original location depends on the endianness, at Value'Address | |
84fb43a1 | 4415 | on a little-endian architecture but not on a big-endian one. */ |
a1ab4c31 AC |
4416 | |
4417 | tree | |
4418 | unchecked_convert (tree type, tree expr, bool notrunc_p) | |
4419 | { | |
4420 | tree etype = TREE_TYPE (expr); | |
c34f3839 EB |
4421 | enum tree_code ecode = TREE_CODE (etype); |
4422 | enum tree_code code = TREE_CODE (type); | |
980a0501 | 4423 | int c; |
a1ab4c31 | 4424 | |
c34f3839 | 4425 | /* If the expression is already of the right type, we are done. */ |
a1ab4c31 AC |
4426 | if (etype == type) |
4427 | return expr; | |
4428 | ||
4429 | /* If both types types are integral just do a normal conversion. | |
4430 | Likewise for a conversion to an unconstrained array. */ | |
4431 | if ((((INTEGRAL_TYPE_P (type) | |
c34f3839 | 4432 | && !(code == INTEGER_TYPE && TYPE_VAX_FLOATING_POINT_P (type))) |
315cff15 | 4433 | || (POINTER_TYPE_P (type) && ! TYPE_IS_THIN_POINTER_P (type)) |
c34f3839 | 4434 | || (code == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (type))) |
a1ab4c31 | 4435 | && ((INTEGRAL_TYPE_P (etype) |
c34f3839 | 4436 | && !(ecode == INTEGER_TYPE && TYPE_VAX_FLOATING_POINT_P (etype))) |
315cff15 | 4437 | || (POINTER_TYPE_P (etype) && !TYPE_IS_THIN_POINTER_P (etype)) |
c34f3839 EB |
4438 | || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype)))) |
4439 | || code == UNCONSTRAINED_ARRAY_TYPE) | |
a1ab4c31 | 4440 | { |
c34f3839 | 4441 | if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype)) |
a1ab4c31 AC |
4442 | { |
4443 | tree ntype = copy_type (etype); | |
a1ab4c31 AC |
4444 | TYPE_BIASED_REPRESENTATION_P (ntype) = 0; |
4445 | TYPE_MAIN_VARIANT (ntype) = ntype; | |
4446 | expr = build1 (NOP_EXPR, ntype, expr); | |
4447 | } | |
4448 | ||
c34f3839 | 4449 | if (code == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (type)) |
a1ab4c31 | 4450 | { |
afcea859 | 4451 | tree rtype = copy_type (type); |
a1ab4c31 AC |
4452 | TYPE_BIASED_REPRESENTATION_P (rtype) = 0; |
4453 | TYPE_MAIN_VARIANT (rtype) = rtype; | |
afcea859 EB |
4454 | expr = convert (rtype, expr); |
4455 | expr = build1 (NOP_EXPR, type, expr); | |
a1ab4c31 | 4456 | } |
afcea859 EB |
4457 | else |
4458 | expr = convert (type, expr); | |
a1ab4c31 AC |
4459 | } |
4460 | ||
afcea859 EB |
4461 | /* If we are converting to an integral type whose precision is not equal |
4462 | to its size, first unchecked convert to a record that contains an | |
4463 | object of the output type. Then extract the field. */ | |
980a0501 EB |
4464 | else if (INTEGRAL_TYPE_P (type) |
4465 | && TYPE_RM_SIZE (type) | |
a1ab4c31 AC |
4466 | && 0 != compare_tree_int (TYPE_RM_SIZE (type), |
4467 | GET_MODE_BITSIZE (TYPE_MODE (type)))) | |
4468 | { | |
4469 | tree rec_type = make_node (RECORD_TYPE); | |
da01bfee EB |
4470 | tree field = create_field_decl (get_identifier ("OBJ"), type, rec_type, |
4471 | NULL_TREE, NULL_TREE, 1, 0); | |
a1ab4c31 AC |
4472 | |
4473 | TYPE_FIELDS (rec_type) = field; | |
4474 | layout_type (rec_type); | |
4475 | ||
4476 | expr = unchecked_convert (rec_type, expr, notrunc_p); | |
3cd64bab | 4477 | expr = build_component_ref (expr, NULL_TREE, field, false); |
a1ab4c31 AC |
4478 | } |
4479 | ||
afcea859 EB |
4480 | /* Similarly if we are converting from an integral type whose precision |
4481 | is not equal to its size. */ | |
980a0501 EB |
4482 | else if (INTEGRAL_TYPE_P (etype) |
4483 | && TYPE_RM_SIZE (etype) | |
4484 | && 0 != compare_tree_int (TYPE_RM_SIZE (etype), | |
4485 | GET_MODE_BITSIZE (TYPE_MODE (etype)))) | |
a1ab4c31 AC |
4486 | { |
4487 | tree rec_type = make_node (RECORD_TYPE); | |
da01bfee EB |
4488 | tree field = create_field_decl (get_identifier ("OBJ"), etype, rec_type, |
4489 | NULL_TREE, NULL_TREE, 1, 0); | |
0e228dd9 | 4490 | VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, 1); |
a1ab4c31 AC |
4491 | |
4492 | TYPE_FIELDS (rec_type) = field; | |
4493 | layout_type (rec_type); | |
4494 | ||
0e228dd9 NF |
4495 | CONSTRUCTOR_APPEND_ELT (v, field, expr); |
4496 | expr = gnat_build_constructor (rec_type, v); | |
a1ab4c31 AC |
4497 | expr = unchecked_convert (type, expr, notrunc_p); |
4498 | } | |
4499 | ||
980a0501 EB |
4500 | /* If we are converting from a scalar type to a type with a different size, |
4501 | we need to pad to have the same size on both sides. | |
4502 | ||
4503 | ??? We cannot do it unconditionally because unchecked conversions are | |
4504 | used liberally by the front-end to implement polymorphism, e.g. in: | |
4505 | ||
4506 | S191s : constant ada__tags__addr_ptr := ada__tags__addr_ptr!(S190s); | |
4507 | return p___size__4 (p__object!(S191s.all)); | |
4508 | ||
4509 | so we skip all expressions that are references. */ | |
4510 | else if (!REFERENCE_CLASS_P (expr) | |
4511 | && !AGGREGATE_TYPE_P (etype) | |
4512 | && TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST | |
4513 | && (c = tree_int_cst_compare (TYPE_SIZE (etype), TYPE_SIZE (type)))) | |
4514 | { | |
4515 | if (c < 0) | |
4516 | { | |
4517 | expr = convert (maybe_pad_type (etype, TYPE_SIZE (type), 0, Empty, | |
4518 | false, false, false, true), | |
4519 | expr); | |
4520 | expr = unchecked_convert (type, expr, notrunc_p); | |
4521 | } | |
4522 | else | |
4523 | { | |
4524 | tree rec_type = maybe_pad_type (type, TYPE_SIZE (etype), 0, Empty, | |
4525 | false, false, false, true); | |
4526 | expr = unchecked_convert (rec_type, expr, notrunc_p); | |
4527 | expr = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (rec_type), | |
4528 | false); | |
4529 | } | |
4530 | } | |
4531 | ||
7948ae37 OH |
4532 | /* We have a special case when we are converting between two unconstrained |
4533 | array types. In that case, take the address, convert the fat pointer | |
4534 | types, and dereference. */ | |
c34f3839 | 4535 | else if (ecode == code && code == UNCONSTRAINED_ARRAY_TYPE) |
a1ab4c31 AC |
4536 | expr = build_unary_op (INDIRECT_REF, NULL_TREE, |
4537 | build1 (VIEW_CONVERT_EXPR, TREE_TYPE (type), | |
4538 | build_unary_op (ADDR_EXPR, NULL_TREE, | |
4539 | expr))); | |
7948ae37 OH |
4540 | |
4541 | /* Another special case is when we are converting to a vector type from its | |
4542 | representative array type; this a regular conversion. */ | |
c34f3839 EB |
4543 | else if (code == VECTOR_TYPE |
4544 | && ecode == ARRAY_TYPE | |
7948ae37 OH |
4545 | && gnat_types_compatible_p (TYPE_REPRESENTATIVE_ARRAY (type), |
4546 | etype)) | |
4547 | expr = convert (type, expr); | |
4548 | ||
a1ab4c31 AC |
4549 | else |
4550 | { | |
4551 | expr = maybe_unconstrained_array (expr); | |
4552 | etype = TREE_TYPE (expr); | |
c34f3839 | 4553 | ecode = TREE_CODE (etype); |
afcea859 EB |
4554 | if (can_fold_for_view_convert_p (expr)) |
4555 | expr = fold_build1 (VIEW_CONVERT_EXPR, type, expr); | |
4556 | else | |
4557 | expr = build1 (VIEW_CONVERT_EXPR, type, expr); | |
a1ab4c31 AC |
4558 | } |
4559 | ||
afcea859 EB |
4560 | /* If the result is an integral type whose precision is not equal to its |
4561 | size, sign- or zero-extend the result. We need not do this if the input | |
4562 | is an integral type of the same precision and signedness or if the output | |
a1ab4c31 AC |
4563 | is a biased type or if both the input and output are unsigned. */ |
4564 | if (!notrunc_p | |
4565 | && INTEGRAL_TYPE_P (type) && TYPE_RM_SIZE (type) | |
c34f3839 | 4566 | && !(code == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (type)) |
a1ab4c31 AC |
4567 | && 0 != compare_tree_int (TYPE_RM_SIZE (type), |
4568 | GET_MODE_BITSIZE (TYPE_MODE (type))) | |
4569 | && !(INTEGRAL_TYPE_P (etype) | |
4570 | && TYPE_UNSIGNED (type) == TYPE_UNSIGNED (etype) | |
4571 | && operand_equal_p (TYPE_RM_SIZE (type), | |
4572 | (TYPE_RM_SIZE (etype) != 0 | |
4573 | ? TYPE_RM_SIZE (etype) : TYPE_SIZE (etype)), | |
4574 | 0)) | |
4575 | && !(TYPE_UNSIGNED (type) && TYPE_UNSIGNED (etype))) | |
4576 | { | |
c34f3839 EB |
4577 | tree base_type |
4578 | = gnat_type_for_mode (TYPE_MODE (type), TYPE_UNSIGNED (type)); | |
a1ab4c31 AC |
4579 | tree shift_expr |
4580 | = convert (base_type, | |
4581 | size_binop (MINUS_EXPR, | |
4582 | bitsize_int | |
4583 | (GET_MODE_BITSIZE (TYPE_MODE (type))), | |
4584 | TYPE_RM_SIZE (type))); | |
4585 | expr | |
4586 | = convert (type, | |
4587 | build_binary_op (RSHIFT_EXPR, base_type, | |
4588 | build_binary_op (LSHIFT_EXPR, base_type, | |
4589 | convert (base_type, expr), | |
4590 | shift_expr), | |
4591 | shift_expr)); | |
4592 | } | |
4593 | ||
4594 | /* An unchecked conversion should never raise Constraint_Error. The code | |
4595 | below assumes that GCC's conversion routines overflow the same way that | |
4596 | the underlying hardware does. This is probably true. In the rare case | |
4597 | when it is false, we can rely on the fact that such conversions are | |
4598 | erroneous anyway. */ | |
4599 | if (TREE_CODE (expr) == INTEGER_CST) | |
4600 | TREE_OVERFLOW (expr) = 0; | |
4601 | ||
4602 | /* If the sizes of the types differ and this is an VIEW_CONVERT_EXPR, | |
4603 | show no longer constant. */ | |
4604 | if (TREE_CODE (expr) == VIEW_CONVERT_EXPR | |
4605 | && !operand_equal_p (TYPE_SIZE_UNIT (type), TYPE_SIZE_UNIT (etype), | |
4606 | OEP_ONLY_CONST)) | |
4607 | TREE_CONSTANT (expr) = 0; | |
4608 | ||
4609 | return expr; | |
4610 | } | |
4611 | \f | |
feec4372 | 4612 | /* Return the appropriate GCC tree code for the specified GNAT_TYPE, |
a1ab4c31 AC |
4613 | the latter being a record type as predicated by Is_Record_Type. */ |
4614 | ||
4615 | enum tree_code | |
4616 | tree_code_for_record_type (Entity_Id gnat_type) | |
4617 | { | |
4618 | Node_Id component_list | |
4619 | = Component_List (Type_Definition | |
4620 | (Declaration_Node | |
4621 | (Implementation_Base_Type (gnat_type)))); | |
4622 | Node_Id component; | |
4623 | ||
4624 | /* Make this a UNION_TYPE unless it's either not an Unchecked_Union or | |
4625 | we have a non-discriminant field outside a variant. In either case, | |
4626 | it's a RECORD_TYPE. */ | |
4627 | ||
4628 | if (!Is_Unchecked_Union (gnat_type)) | |
4629 | return RECORD_TYPE; | |
4630 | ||
4631 | for (component = First_Non_Pragma (Component_Items (component_list)); | |
4632 | Present (component); | |
4633 | component = Next_Non_Pragma (component)) | |
4634 | if (Ekind (Defining_Entity (component)) == E_Component) | |
4635 | return RECORD_TYPE; | |
4636 | ||
4637 | return UNION_TYPE; | |
4638 | } | |
4639 | ||
caa9d12a EB |
4640 | /* Return true if GNAT_TYPE is a "double" floating-point type, i.e. whose |
4641 | size is equal to 64 bits, or an array of such a type. Set ALIGN_CLAUSE | |
4642 | according to the presence of an alignment clause on the type or, if it | |
4643 | is an array, on the component type. */ | |
4644 | ||
4645 | bool | |
4646 | is_double_float_or_array (Entity_Id gnat_type, bool *align_clause) | |
4647 | { | |
4648 | gnat_type = Underlying_Type (gnat_type); | |
4649 | ||
4650 | *align_clause = Present (Alignment_Clause (gnat_type)); | |
4651 | ||
4652 | if (Is_Array_Type (gnat_type)) | |
4653 | { | |
4654 | gnat_type = Underlying_Type (Component_Type (gnat_type)); | |
4655 | if (Present (Alignment_Clause (gnat_type))) | |
4656 | *align_clause = true; | |
4657 | } | |
4658 | ||
4659 | if (!Is_Floating_Point_Type (gnat_type)) | |
4660 | return false; | |
4661 | ||
4662 | if (UI_To_Int (Esize (gnat_type)) != 64) | |
4663 | return false; | |
4664 | ||
4665 | return true; | |
4666 | } | |
4667 | ||
4668 | /* Return true if GNAT_TYPE is a "double" or larger scalar type, i.e. whose | |
4669 | size is greater or equal to 64 bits, or an array of such a type. Set | |
4670 | ALIGN_CLAUSE according to the presence of an alignment clause on the | |
4671 | type or, if it is an array, on the component type. */ | |
4672 | ||
4673 | bool | |
4674 | is_double_scalar_or_array (Entity_Id gnat_type, bool *align_clause) | |
4675 | { | |
4676 | gnat_type = Underlying_Type (gnat_type); | |
4677 | ||
4678 | *align_clause = Present (Alignment_Clause (gnat_type)); | |
4679 | ||
4680 | if (Is_Array_Type (gnat_type)) | |
4681 | { | |
4682 | gnat_type = Underlying_Type (Component_Type (gnat_type)); | |
4683 | if (Present (Alignment_Clause (gnat_type))) | |
4684 | *align_clause = true; | |
4685 | } | |
4686 | ||
4687 | if (!Is_Scalar_Type (gnat_type)) | |
4688 | return false; | |
4689 | ||
4690 | if (UI_To_Int (Esize (gnat_type)) < 64) | |
4691 | return false; | |
4692 | ||
4693 | return true; | |
4694 | } | |
4695 | ||
a1ab4c31 AC |
4696 | /* Return true if GNU_TYPE is suitable as the type of a non-aliased |
4697 | component of an aggregate type. */ | |
4698 | ||
4699 | bool | |
4700 | type_for_nonaliased_component_p (tree gnu_type) | |
4701 | { | |
4702 | /* If the type is passed by reference, we may have pointers to the | |
4703 | component so it cannot be made non-aliased. */ | |
4704 | if (must_pass_by_ref (gnu_type) || default_pass_by_ref (gnu_type)) | |
4705 | return false; | |
4706 | ||
4707 | /* We used to say that any component of aggregate type is aliased | |
4708 | because the front-end may take 'Reference of it. The front-end | |
4709 | has been enhanced in the meantime so as to use a renaming instead | |
4710 | in most cases, but the back-end can probably take the address of | |
4711 | such a component too so we go for the conservative stance. | |
4712 | ||
4713 | For instance, we might need the address of any array type, even | |
4714 | if normally passed by copy, to construct a fat pointer if the | |
4715 | component is used as an actual for an unconstrained formal. | |
4716 | ||
4717 | Likewise for record types: even if a specific record subtype is | |
4718 | passed by copy, the parent type might be passed by ref (e.g. if | |
4719 | it's of variable size) and we might take the address of a child | |
4720 | component to pass to a parent formal. We have no way to check | |
4721 | for such conditions here. */ | |
4722 | if (AGGREGATE_TYPE_P (gnu_type)) | |
4723 | return false; | |
4724 | ||
4725 | return true; | |
4726 | } | |
4727 | ||
bb1f7929 EB |
4728 | /* Return true if TYPE is a smaller form of ORIG_TYPE. */ |
4729 | ||
4730 | bool | |
4731 | smaller_form_type_p (tree type, tree orig_type) | |
4732 | { | |
4733 | tree size, osize; | |
4734 | ||
4735 | /* We're not interested in variants here. */ | |
4736 | if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (orig_type)) | |
4737 | return false; | |
4738 | ||
4739 | /* Like a variant, a packable version keeps the original TYPE_NAME. */ | |
4740 | if (TYPE_NAME (type) != TYPE_NAME (orig_type)) | |
4741 | return false; | |
4742 | ||
4743 | size = TYPE_SIZE (type); | |
4744 | osize = TYPE_SIZE (orig_type); | |
4745 | ||
4746 | if (!(TREE_CODE (size) == INTEGER_CST && TREE_CODE (osize) == INTEGER_CST)) | |
4747 | return false; | |
4748 | ||
4749 | return tree_int_cst_lt (size, osize) != 0; | |
4750 | } | |
4751 | ||
a1ab4c31 AC |
4752 | /* Perform final processing on global variables. */ |
4753 | ||
65444786 EB |
4754 | static GTY (()) tree dummy_global; |
4755 | ||
a1ab4c31 AC |
4756 | void |
4757 | gnat_write_global_declarations (void) | |
4758 | { | |
65444786 EB |
4759 | /* If we have declared types as used at the global level, insert them in |
4760 | the global hash table. We use a dummy variable for this purpose. */ | |
4761 | if (!VEC_empty (tree, types_used_by_cur_var_decl)) | |
4762 | { | |
4763 | dummy_global | |
4764 | = build_decl (BUILTINS_LOCATION, VAR_DECL, NULL_TREE, void_type_node); | |
4765 | TREE_STATIC (dummy_global) = 1; | |
4766 | TREE_ASM_WRITTEN (dummy_global) = 1; | |
4767 | varpool_mark_needed_node (varpool_node (dummy_global)); | |
4768 | ||
4769 | while (!VEC_empty (tree, types_used_by_cur_var_decl)) | |
4770 | { | |
4771 | tree t = VEC_pop (tree, types_used_by_cur_var_decl); | |
4772 | types_used_by_var_decl_insert (t, dummy_global); | |
4773 | } | |
4774 | } | |
4775 | ||
a1ab4c31 AC |
4776 | /* Proceed to optimize and emit assembly. |
4777 | FIXME: shouldn't be the front end's responsibility to call this. */ | |
a406865a | 4778 | cgraph_finalize_compilation_unit (); |
a1ab4c31 AC |
4779 | |
4780 | /* Emit debug info for all global declarations. */ | |
4781 | emit_debug_global_declarations (VEC_address (tree, global_decls), | |
4782 | VEC_length (tree, global_decls)); | |
4783 | } | |
4784 | ||
4785 | /* ************************************************************************ | |
4786 | * * GCC builtins support * | |
4787 | * ************************************************************************ */ | |
4788 | ||
4789 | /* The general scheme is fairly simple: | |
4790 | ||
4791 | For each builtin function/type to be declared, gnat_install_builtins calls | |
4792 | internal facilities which eventually get to gnat_push_decl, which in turn | |
4793 | tracks the so declared builtin function decls in the 'builtin_decls' global | |
4794 | datastructure. When an Intrinsic subprogram declaration is processed, we | |
4795 | search this global datastructure to retrieve the associated BUILT_IN DECL | |
4796 | node. */ | |
4797 | ||
4798 | /* Search the chain of currently available builtin declarations for a node | |
4799 | corresponding to function NAME (an IDENTIFIER_NODE). Return the first node | |
4800 | found, if any, or NULL_TREE otherwise. */ | |
4801 | tree | |
4802 | builtin_decl_for (tree name) | |
4803 | { | |
4804 | unsigned i; | |
4805 | tree decl; | |
4806 | ||
ac47786e | 4807 | FOR_EACH_VEC_ELT (tree, builtin_decls, i, decl) |
a1ab4c31 AC |
4808 | if (DECL_NAME (decl) == name) |
4809 | return decl; | |
4810 | ||
4811 | return NULL_TREE; | |
4812 | } | |
4813 | ||
4814 | /* The code below eventually exposes gnat_install_builtins, which declares | |
4815 | the builtin types and functions we might need, either internally or as | |
4816 | user accessible facilities. | |
4817 | ||
4818 | ??? This is a first implementation shot, still in rough shape. It is | |
4819 | heavily inspired from the "C" family implementation, with chunks copied | |
4820 | verbatim from there. | |
4821 | ||
4822 | Two obvious TODO candidates are | |
4823 | o Use a more efficient name/decl mapping scheme | |
4824 | o Devise a middle-end infrastructure to avoid having to copy | |
4825 | pieces between front-ends. */ | |
4826 | ||
4827 | /* ----------------------------------------------------------------------- * | |
4828 | * BUILTIN ELEMENTARY TYPES * | |
4829 | * ----------------------------------------------------------------------- */ | |
4830 | ||
4831 | /* Standard data types to be used in builtin argument declarations. */ | |
4832 | ||
4833 | enum c_tree_index | |
4834 | { | |
4835 | CTI_SIGNED_SIZE_TYPE, /* For format checking only. */ | |
4836 | CTI_STRING_TYPE, | |
4837 | CTI_CONST_STRING_TYPE, | |
4838 | ||
4839 | CTI_MAX | |
4840 | }; | |
4841 | ||
4842 | static tree c_global_trees[CTI_MAX]; | |
4843 | ||
4844 | #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE] | |
4845 | #define string_type_node c_global_trees[CTI_STRING_TYPE] | |
4846 | #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE] | |
4847 | ||
4848 | /* ??? In addition some attribute handlers, we currently don't support a | |
4849 | (small) number of builtin-types, which in turns inhibits support for a | |
4850 | number of builtin functions. */ | |
4851 | #define wint_type_node void_type_node | |
4852 | #define intmax_type_node void_type_node | |
4853 | #define uintmax_type_node void_type_node | |
4854 | ||
4855 | /* Build the void_list_node (void_type_node having been created). */ | |
4856 | ||
4857 | static tree | |
4858 | build_void_list_node (void) | |
4859 | { | |
4860 | tree t = build_tree_list (NULL_TREE, void_type_node); | |
4861 | return t; | |
4862 | } | |
4863 | ||
4864 | /* Used to help initialize the builtin-types.def table. When a type of | |
4865 | the correct size doesn't exist, use error_mark_node instead of NULL. | |
4866 | The later results in segfaults even when a decl using the type doesn't | |
4867 | get invoked. */ | |
4868 | ||
4869 | static tree | |
4870 | builtin_type_for_size (int size, bool unsignedp) | |
4871 | { | |
ced57283 | 4872 | tree type = gnat_type_for_size (size, unsignedp); |
a1ab4c31 AC |
4873 | return type ? type : error_mark_node; |
4874 | } | |
4875 | ||
4876 | /* Build/push the elementary type decls that builtin functions/types | |
4877 | will need. */ | |
4878 | ||
4879 | static void | |
4880 | install_builtin_elementary_types (void) | |
4881 | { | |
728936bb | 4882 | signed_size_type_node = gnat_signed_type (size_type_node); |
a1ab4c31 AC |
4883 | pid_type_node = integer_type_node; |
4884 | void_list_node = build_void_list_node (); | |
4885 | ||
4886 | string_type_node = build_pointer_type (char_type_node); | |
4887 | const_string_type_node | |
4888 | = build_pointer_type (build_qualified_type | |
4889 | (char_type_node, TYPE_QUAL_CONST)); | |
4890 | } | |
4891 | ||
4892 | /* ----------------------------------------------------------------------- * | |
4893 | * BUILTIN FUNCTION TYPES * | |
4894 | * ----------------------------------------------------------------------- */ | |
4895 | ||
4896 | /* Now, builtin function types per se. */ | |
4897 | ||
4898 | enum c_builtin_type | |
4899 | { | |
4900 | #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, | |
4901 | #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, | |
4902 | #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, | |
4903 | #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, | |
4904 | #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
4905 | #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
4906 | #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME, | |
4907 | #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME, | |
4908 | #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME, | |
4909 | #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, | |
4910 | #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, | |
4911 | #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, | |
4912 | #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, | |
4913 | #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, | |
4914 | #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \ | |
4915 | NAME, | |
4916 | #define DEF_POINTER_TYPE(NAME, TYPE) NAME, | |
4917 | #include "builtin-types.def" | |
4918 | #undef DEF_PRIMITIVE_TYPE | |
4919 | #undef DEF_FUNCTION_TYPE_0 | |
4920 | #undef DEF_FUNCTION_TYPE_1 | |
4921 | #undef DEF_FUNCTION_TYPE_2 | |
4922 | #undef DEF_FUNCTION_TYPE_3 | |
4923 | #undef DEF_FUNCTION_TYPE_4 | |
4924 | #undef DEF_FUNCTION_TYPE_5 | |
4925 | #undef DEF_FUNCTION_TYPE_6 | |
4926 | #undef DEF_FUNCTION_TYPE_7 | |
4927 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
4928 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
4929 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
4930 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
4931 | #undef DEF_FUNCTION_TYPE_VAR_4 | |
4932 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
4933 | #undef DEF_POINTER_TYPE | |
4934 | BT_LAST | |
4935 | }; | |
4936 | ||
4937 | typedef enum c_builtin_type builtin_type; | |
4938 | ||
4939 | /* A temporary array used in communication with def_fn_type. */ | |
4940 | static GTY(()) tree builtin_types[(int) BT_LAST + 1]; | |
4941 | ||
4942 | /* A helper function for install_builtin_types. Build function type | |
4943 | for DEF with return type RET and N arguments. If VAR is true, then the | |
4944 | function should be variadic after those N arguments. | |
4945 | ||
4946 | Takes special care not to ICE if any of the types involved are | |
4947 | error_mark_node, which indicates that said type is not in fact available | |
4948 | (see builtin_type_for_size). In which case the function type as a whole | |
4949 | should be error_mark_node. */ | |
4950 | ||
4951 | static void | |
4952 | def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...) | |
4953 | { | |
e5b00edf NF |
4954 | tree t; |
4955 | tree *args = XALLOCAVEC (tree, n); | |
a1ab4c31 AC |
4956 | va_list list; |
4957 | int i; | |
4958 | ||
4959 | va_start (list, n); | |
4960 | for (i = 0; i < n; ++i) | |
4961 | { | |
c6bd4220 | 4962 | builtin_type a = (builtin_type) va_arg (list, int); |
a1ab4c31 AC |
4963 | t = builtin_types[a]; |
4964 | if (t == error_mark_node) | |
4965 | goto egress; | |
e5b00edf | 4966 | args[i] = t; |
a1ab4c31 | 4967 | } |
a1ab4c31 | 4968 | |
a1ab4c31 AC |
4969 | t = builtin_types[ret]; |
4970 | if (t == error_mark_node) | |
4971 | goto egress; | |
e5b00edf NF |
4972 | if (var) |
4973 | t = build_varargs_function_type_array (t, n, args); | |
4974 | else | |
4975 | t = build_function_type_array (t, n, args); | |
a1ab4c31 AC |
4976 | |
4977 | egress: | |
4978 | builtin_types[def] = t; | |
0edf1bb2 | 4979 | va_end (list); |
a1ab4c31 AC |
4980 | } |
4981 | ||
4982 | /* Build the builtin function types and install them in the builtin_types | |
4983 | array for later use in builtin function decls. */ | |
4984 | ||
4985 | static void | |
4986 | install_builtin_function_types (void) | |
4987 | { | |
4988 | tree va_list_ref_type_node; | |
4989 | tree va_list_arg_type_node; | |
4990 | ||
4991 | if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) | |
4992 | { | |
4993 | va_list_arg_type_node = va_list_ref_type_node = | |
4994 | build_pointer_type (TREE_TYPE (va_list_type_node)); | |
4995 | } | |
4996 | else | |
4997 | { | |
4998 | va_list_arg_type_node = va_list_type_node; | |
4999 | va_list_ref_type_node = build_reference_type (va_list_type_node); | |
5000 | } | |
5001 | ||
5002 | #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ | |
5003 | builtin_types[ENUM] = VALUE; | |
5004 | #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ | |
5005 | def_fn_type (ENUM, RETURN, 0, 0); | |
5006 | #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ | |
5007 | def_fn_type (ENUM, RETURN, 0, 1, ARG1); | |
5008 | #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ | |
5009 | def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2); | |
5010 | #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
5011 | def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3); | |
5012 | #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
5013 | def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4); | |
5014 | #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
5015 | def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
5016 | #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5017 | ARG6) \ | |
5018 | def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6); | |
5019 | #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ | |
5020 | ARG6, ARG7) \ | |
5021 | def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7); | |
5022 | #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ | |
5023 | def_fn_type (ENUM, RETURN, 1, 0); | |
5024 | #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ | |
5025 | def_fn_type (ENUM, RETURN, 1, 1, ARG1); | |
5026 | #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ | |
5027 | def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2); | |
5028 | #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ | |
5029 | def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3); | |
5030 | #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ | |
5031 | def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4); | |
5032 | #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ | |
5033 | def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5); | |
5034 | #define DEF_POINTER_TYPE(ENUM, TYPE) \ | |
5035 | builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]); | |
5036 | ||
5037 | #include "builtin-types.def" | |
5038 | ||
5039 | #undef DEF_PRIMITIVE_TYPE | |
5040 | #undef DEF_FUNCTION_TYPE_1 | |
5041 | #undef DEF_FUNCTION_TYPE_2 | |
5042 | #undef DEF_FUNCTION_TYPE_3 | |
5043 | #undef DEF_FUNCTION_TYPE_4 | |
5044 | #undef DEF_FUNCTION_TYPE_5 | |
5045 | #undef DEF_FUNCTION_TYPE_6 | |
5046 | #undef DEF_FUNCTION_TYPE_VAR_0 | |
5047 | #undef DEF_FUNCTION_TYPE_VAR_1 | |
5048 | #undef DEF_FUNCTION_TYPE_VAR_2 | |
5049 | #undef DEF_FUNCTION_TYPE_VAR_3 | |
5050 | #undef DEF_FUNCTION_TYPE_VAR_4 | |
5051 | #undef DEF_FUNCTION_TYPE_VAR_5 | |
5052 | #undef DEF_POINTER_TYPE | |
5053 | builtin_types[(int) BT_LAST] = NULL_TREE; | |
5054 | } | |
5055 | ||
5056 | /* ----------------------------------------------------------------------- * | |
5057 | * BUILTIN ATTRIBUTES * | |
5058 | * ----------------------------------------------------------------------- */ | |
5059 | ||
5060 | enum built_in_attribute | |
5061 | { | |
5062 | #define DEF_ATTR_NULL_TREE(ENUM) ENUM, | |
5063 | #define DEF_ATTR_INT(ENUM, VALUE) ENUM, | |
5064 | #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, | |
5065 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, | |
5066 | #include "builtin-attrs.def" | |
5067 | #undef DEF_ATTR_NULL_TREE | |
5068 | #undef DEF_ATTR_INT | |
5069 | #undef DEF_ATTR_IDENT | |
5070 | #undef DEF_ATTR_TREE_LIST | |
5071 | ATTR_LAST | |
5072 | }; | |
5073 | ||
5074 | static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; | |
5075 | ||
5076 | static void | |
5077 | install_builtin_attributes (void) | |
5078 | { | |
5079 | /* Fill in the built_in_attributes array. */ | |
5080 | #define DEF_ATTR_NULL_TREE(ENUM) \ | |
5081 | built_in_attributes[(int) ENUM] = NULL_TREE; | |
5082 | #define DEF_ATTR_INT(ENUM, VALUE) \ | |
5083 | built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE); | |
5084 | #define DEF_ATTR_IDENT(ENUM, STRING) \ | |
5085 | built_in_attributes[(int) ENUM] = get_identifier (STRING); | |
5086 | #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ | |
5087 | built_in_attributes[(int) ENUM] \ | |
5088 | = tree_cons (built_in_attributes[(int) PURPOSE], \ | |
5089 | built_in_attributes[(int) VALUE], \ | |
5090 | built_in_attributes[(int) CHAIN]); | |
5091 | #include "builtin-attrs.def" | |
5092 | #undef DEF_ATTR_NULL_TREE | |
5093 | #undef DEF_ATTR_INT | |
5094 | #undef DEF_ATTR_IDENT | |
5095 | #undef DEF_ATTR_TREE_LIST | |
5096 | } | |
5097 | ||
5098 | /* Handle a "const" attribute; arguments as in | |
5099 | struct attribute_spec.handler. */ | |
5100 | ||
5101 | static tree | |
5102 | handle_const_attribute (tree *node, tree ARG_UNUSED (name), | |
5103 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5104 | bool *no_add_attrs) | |
5105 | { | |
5106 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5107 | TREE_READONLY (*node) = 1; | |
5108 | else | |
5109 | *no_add_attrs = true; | |
5110 | ||
5111 | return NULL_TREE; | |
5112 | } | |
5113 | ||
5114 | /* Handle a "nothrow" attribute; arguments as in | |
5115 | struct attribute_spec.handler. */ | |
5116 | ||
5117 | static tree | |
5118 | handle_nothrow_attribute (tree *node, tree ARG_UNUSED (name), | |
5119 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5120 | bool *no_add_attrs) | |
5121 | { | |
5122 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5123 | TREE_NOTHROW (*node) = 1; | |
5124 | else | |
5125 | *no_add_attrs = true; | |
5126 | ||
5127 | return NULL_TREE; | |
5128 | } | |
5129 | ||
5130 | /* Handle a "pure" attribute; arguments as in | |
5131 | struct attribute_spec.handler. */ | |
5132 | ||
5133 | static tree | |
5134 | handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5135 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5136 | { | |
5137 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5138 | DECL_PURE_P (*node) = 1; | |
5139 | /* ??? TODO: Support types. */ | |
5140 | else | |
5141 | { | |
7948ae37 OH |
5142 | warning (OPT_Wattributes, "%qs attribute ignored", |
5143 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
5144 | *no_add_attrs = true; |
5145 | } | |
5146 | ||
5147 | return NULL_TREE; | |
5148 | } | |
5149 | ||
5150 | /* Handle a "no vops" attribute; arguments as in | |
5151 | struct attribute_spec.handler. */ | |
5152 | ||
5153 | static tree | |
5154 | handle_novops_attribute (tree *node, tree ARG_UNUSED (name), | |
5155 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5156 | bool *ARG_UNUSED (no_add_attrs)) | |
5157 | { | |
5158 | gcc_assert (TREE_CODE (*node) == FUNCTION_DECL); | |
5159 | DECL_IS_NOVOPS (*node) = 1; | |
5160 | return NULL_TREE; | |
5161 | } | |
5162 | ||
5163 | /* Helper for nonnull attribute handling; fetch the operand number | |
5164 | from the attribute argument list. */ | |
5165 | ||
5166 | static bool | |
5167 | get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) | |
5168 | { | |
5169 | /* Verify the arg number is a constant. */ | |
5170 | if (TREE_CODE (arg_num_expr) != INTEGER_CST | |
5171 | || TREE_INT_CST_HIGH (arg_num_expr) != 0) | |
5172 | return false; | |
5173 | ||
5174 | *valp = TREE_INT_CST_LOW (arg_num_expr); | |
5175 | return true; | |
5176 | } | |
5177 | ||
5178 | /* Handle the "nonnull" attribute. */ | |
5179 | static tree | |
5180 | handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name), | |
5181 | tree args, int ARG_UNUSED (flags), | |
5182 | bool *no_add_attrs) | |
5183 | { | |
5184 | tree type = *node; | |
5185 | unsigned HOST_WIDE_INT attr_arg_num; | |
5186 | ||
5187 | /* If no arguments are specified, all pointer arguments should be | |
5188 | non-null. Verify a full prototype is given so that the arguments | |
5189 | will have the correct types when we actually check them later. */ | |
5190 | if (!args) | |
5191 | { | |
f4da8dce | 5192 | if (!prototype_p (type)) |
a1ab4c31 AC |
5193 | { |
5194 | error ("nonnull attribute without arguments on a non-prototype"); | |
5195 | *no_add_attrs = true; | |
5196 | } | |
5197 | return NULL_TREE; | |
5198 | } | |
5199 | ||
5200 | /* Argument list specified. Verify that each argument number references | |
5201 | a pointer argument. */ | |
5202 | for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) | |
5203 | { | |
a1ab4c31 AC |
5204 | unsigned HOST_WIDE_INT arg_num = 0, ck_num; |
5205 | ||
5206 | if (!get_nonnull_operand (TREE_VALUE (args), &arg_num)) | |
5207 | { | |
5208 | error ("nonnull argument has invalid operand number (argument %lu)", | |
5209 | (unsigned long) attr_arg_num); | |
5210 | *no_add_attrs = true; | |
5211 | return NULL_TREE; | |
5212 | } | |
5213 | ||
d7d058c5 | 5214 | if (prototype_p (type)) |
a1ab4c31 | 5215 | { |
d7d058c5 NF |
5216 | function_args_iterator iter; |
5217 | tree argument; | |
5218 | ||
5219 | function_args_iter_init (&iter, type); | |
5220 | for (ck_num = 1; ; ck_num++, function_args_iter_next (&iter)) | |
a1ab4c31 | 5221 | { |
d7d058c5 | 5222 | argument = function_args_iter_cond (&iter); |
a1ab4c31 AC |
5223 | if (!argument || ck_num == arg_num) |
5224 | break; | |
a1ab4c31 AC |
5225 | } |
5226 | ||
5227 | if (!argument | |
d7d058c5 | 5228 | || TREE_CODE (argument) == VOID_TYPE) |
a1ab4c31 | 5229 | { |
58c8f770 EB |
5230 | error ("nonnull argument with out-of-range operand number " |
5231 | "(argument %lu, operand %lu)", | |
a1ab4c31 AC |
5232 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
5233 | *no_add_attrs = true; | |
5234 | return NULL_TREE; | |
5235 | } | |
5236 | ||
d7d058c5 | 5237 | if (TREE_CODE (argument) != POINTER_TYPE) |
a1ab4c31 | 5238 | { |
58c8f770 EB |
5239 | error ("nonnull argument references non-pointer operand " |
5240 | "(argument %lu, operand %lu)", | |
a1ab4c31 AC |
5241 | (unsigned long) attr_arg_num, (unsigned long) arg_num); |
5242 | *no_add_attrs = true; | |
5243 | return NULL_TREE; | |
5244 | } | |
5245 | } | |
5246 | } | |
5247 | ||
5248 | return NULL_TREE; | |
5249 | } | |
5250 | ||
5251 | /* Handle a "sentinel" attribute. */ | |
5252 | ||
5253 | static tree | |
5254 | handle_sentinel_attribute (tree *node, tree name, tree args, | |
5255 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5256 | { | |
f4da8dce | 5257 | if (!prototype_p (*node)) |
a1ab4c31 AC |
5258 | { |
5259 | warning (OPT_Wattributes, | |
7948ae37 OH |
5260 | "%qs attribute requires prototypes with named arguments", |
5261 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
5262 | *no_add_attrs = true; |
5263 | } | |
5264 | else | |
5265 | { | |
dcf0c47e | 5266 | if (!stdarg_p (*node)) |
a1ab4c31 AC |
5267 | { |
5268 | warning (OPT_Wattributes, | |
7948ae37 OH |
5269 | "%qs attribute only applies to variadic functions", |
5270 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
5271 | *no_add_attrs = true; |
5272 | } | |
5273 | } | |
5274 | ||
5275 | if (args) | |
5276 | { | |
5277 | tree position = TREE_VALUE (args); | |
5278 | ||
5279 | if (TREE_CODE (position) != INTEGER_CST) | |
5280 | { | |
5281 | warning (0, "requested position is not an integer constant"); | |
5282 | *no_add_attrs = true; | |
5283 | } | |
5284 | else | |
5285 | { | |
5286 | if (tree_int_cst_lt (position, integer_zero_node)) | |
5287 | { | |
5288 | warning (0, "requested position is less than zero"); | |
5289 | *no_add_attrs = true; | |
5290 | } | |
5291 | } | |
5292 | } | |
5293 | ||
5294 | return NULL_TREE; | |
5295 | } | |
5296 | ||
5297 | /* Handle a "noreturn" attribute; arguments as in | |
5298 | struct attribute_spec.handler. */ | |
5299 | ||
5300 | static tree | |
5301 | handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5302 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5303 | { | |
5304 | tree type = TREE_TYPE (*node); | |
5305 | ||
5306 | /* See FIXME comment in c_common_attribute_table. */ | |
5307 | if (TREE_CODE (*node) == FUNCTION_DECL) | |
5308 | TREE_THIS_VOLATILE (*node) = 1; | |
5309 | else if (TREE_CODE (type) == POINTER_TYPE | |
5310 | && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) | |
5311 | TREE_TYPE (*node) | |
5312 | = build_pointer_type | |
5313 | (build_type_variant (TREE_TYPE (type), | |
5314 | TYPE_READONLY (TREE_TYPE (type)), 1)); | |
5315 | else | |
5316 | { | |
7948ae37 OH |
5317 | warning (OPT_Wattributes, "%qs attribute ignored", |
5318 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
5319 | *no_add_attrs = true; |
5320 | } | |
5321 | ||
5322 | return NULL_TREE; | |
5323 | } | |
5324 | ||
0d6e14fd JH |
5325 | /* Handle a "leaf" attribute; arguments as in |
5326 | struct attribute_spec.handler. */ | |
5327 | ||
5328 | static tree | |
5329 | handle_leaf_attribute (tree *node, tree name, | |
5330 | tree ARG_UNUSED (args), | |
5331 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5332 | { | |
5333 | if (TREE_CODE (*node) != FUNCTION_DECL) | |
5334 | { | |
5335 | warning (OPT_Wattributes, "%qE attribute ignored", name); | |
5336 | *no_add_attrs = true; | |
5337 | } | |
5338 | if (!TREE_PUBLIC (*node)) | |
5339 | { | |
32a5388a | 5340 | warning (OPT_Wattributes, "%qE attribute has no effect", name); |
0d6e14fd JH |
5341 | *no_add_attrs = true; |
5342 | } | |
5343 | ||
5344 | return NULL_TREE; | |
5345 | } | |
5346 | ||
a1ab4c31 AC |
5347 | /* Handle a "malloc" attribute; arguments as in |
5348 | struct attribute_spec.handler. */ | |
5349 | ||
5350 | static tree | |
5351 | handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5352 | int ARG_UNUSED (flags), bool *no_add_attrs) | |
5353 | { | |
5354 | if (TREE_CODE (*node) == FUNCTION_DECL | |
5355 | && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node)))) | |
5356 | DECL_IS_MALLOC (*node) = 1; | |
5357 | else | |
5358 | { | |
7948ae37 OH |
5359 | warning (OPT_Wattributes, "%qs attribute ignored", |
5360 | IDENTIFIER_POINTER (name)); | |
a1ab4c31 AC |
5361 | *no_add_attrs = true; |
5362 | } | |
5363 | ||
5364 | return NULL_TREE; | |
5365 | } | |
5366 | ||
5367 | /* Fake handler for attributes we don't properly support. */ | |
5368 | ||
5369 | tree | |
5370 | fake_attribute_handler (tree * ARG_UNUSED (node), | |
5371 | tree ARG_UNUSED (name), | |
5372 | tree ARG_UNUSED (args), | |
5373 | int ARG_UNUSED (flags), | |
5374 | bool * ARG_UNUSED (no_add_attrs)) | |
5375 | { | |
5376 | return NULL_TREE; | |
5377 | } | |
5378 | ||
5379 | /* Handle a "type_generic" attribute. */ | |
5380 | ||
5381 | static tree | |
5382 | handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name), | |
5383 | tree ARG_UNUSED (args), int ARG_UNUSED (flags), | |
5384 | bool * ARG_UNUSED (no_add_attrs)) | |
5385 | { | |
a1ab4c31 AC |
5386 | /* Ensure we have a function type. */ |
5387 | gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE); | |
b4680ca1 | 5388 | |
a1ab4c31 | 5389 | /* Ensure we have a variadic function. */ |
dcf0c47e | 5390 | gcc_assert (!prototype_p (*node) || stdarg_p (*node)); |
a1ab4c31 AC |
5391 | |
5392 | return NULL_TREE; | |
5393 | } | |
5394 | ||
2724e58f OH |
5395 | /* Handle a "vector_size" attribute; arguments as in |
5396 | struct attribute_spec.handler. */ | |
5397 | ||
5398 | static tree | |
5399 | handle_vector_size_attribute (tree *node, tree name, tree args, | |
5400 | int ARG_UNUSED (flags), | |
5401 | bool *no_add_attrs) | |
5402 | { | |
5403 | unsigned HOST_WIDE_INT vecsize, nunits; | |
5404 | enum machine_mode orig_mode; | |
5405 | tree type = *node, new_type, size; | |
5406 | ||
5407 | *no_add_attrs = true; | |
5408 | ||
5409 | size = TREE_VALUE (args); | |
5410 | ||
5411 | if (!host_integerp (size, 1)) | |
5412 | { | |
7948ae37 OH |
5413 | warning (OPT_Wattributes, "%qs attribute ignored", |
5414 | IDENTIFIER_POINTER (name)); | |
2724e58f OH |
5415 | return NULL_TREE; |
5416 | } | |
5417 | ||
5418 | /* Get the vector size (in bytes). */ | |
5419 | vecsize = tree_low_cst (size, 1); | |
5420 | ||
5421 | /* We need to provide for vector pointers, vector arrays, and | |
5422 | functions returning vectors. For example: | |
5423 | ||
5424 | __attribute__((vector_size(16))) short *foo; | |
5425 | ||
5426 | In this case, the mode is SI, but the type being modified is | |
5427 | HI, so we need to look further. */ | |
5428 | ||
5429 | while (POINTER_TYPE_P (type) | |
5430 | || TREE_CODE (type) == FUNCTION_TYPE | |
132a5459 | 5431 | || TREE_CODE (type) == ARRAY_TYPE) |
2724e58f OH |
5432 | type = TREE_TYPE (type); |
5433 | ||
5434 | /* Get the mode of the type being modified. */ | |
5435 | orig_mode = TYPE_MODE (type); | |
5436 | ||
5437 | if ((!INTEGRAL_TYPE_P (type) | |
5438 | && !SCALAR_FLOAT_TYPE_P (type) | |
5439 | && !FIXED_POINT_TYPE_P (type)) | |
5440 | || (!SCALAR_FLOAT_MODE_P (orig_mode) | |
5441 | && GET_MODE_CLASS (orig_mode) != MODE_INT | |
5442 | && !ALL_SCALAR_FIXED_POINT_MODE_P (orig_mode)) | |
5443 | || !host_integerp (TYPE_SIZE_UNIT (type), 1) | |
5444 | || TREE_CODE (type) == BOOLEAN_TYPE) | |
5445 | { | |
7948ae37 OH |
5446 | error ("invalid vector type for attribute %qs", |
5447 | IDENTIFIER_POINTER (name)); | |
2724e58f OH |
5448 | return NULL_TREE; |
5449 | } | |
5450 | ||
5451 | if (vecsize % tree_low_cst (TYPE_SIZE_UNIT (type), 1)) | |
5452 | { | |
5453 | error ("vector size not an integral multiple of component size"); | |
5454 | return NULL; | |
5455 | } | |
5456 | ||
5457 | if (vecsize == 0) | |
5458 | { | |
5459 | error ("zero vector size"); | |
5460 | return NULL; | |
5461 | } | |
5462 | ||
5463 | /* Calculate how many units fit in the vector. */ | |
5464 | nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1); | |
5465 | if (nunits & (nunits - 1)) | |
5466 | { | |
5467 | error ("number of components of the vector not a power of two"); | |
5468 | return NULL_TREE; | |
5469 | } | |
5470 | ||
5471 | new_type = build_vector_type (type, nunits); | |
5472 | ||
5473 | /* Build back pointers if needed. */ | |
9b469089 | 5474 | *node = reconstruct_complex_type (*node, new_type); |
2724e58f OH |
5475 | |
5476 | return NULL_TREE; | |
5477 | } | |
5478 | ||
7948ae37 OH |
5479 | /* Handle a "vector_type" attribute; arguments as in |
5480 | struct attribute_spec.handler. */ | |
5481 | ||
5482 | static tree | |
5483 | handle_vector_type_attribute (tree *node, tree name, tree ARG_UNUSED (args), | |
5484 | int ARG_UNUSED (flags), | |
5485 | bool *no_add_attrs) | |
5486 | { | |
5487 | /* Vector representative type and size. */ | |
5488 | tree rep_type = *node; | |
5489 | tree rep_size = TYPE_SIZE_UNIT (rep_type); | |
5490 | tree rep_name; | |
5491 | ||
5492 | /* Vector size in bytes and number of units. */ | |
5493 | unsigned HOST_WIDE_INT vec_bytes, vec_units; | |
5494 | ||
5495 | /* Vector element type and mode. */ | |
5496 | tree elem_type; | |
5497 | enum machine_mode elem_mode; | |
5498 | ||
5499 | *no_add_attrs = true; | |
5500 | ||
5501 | /* Get the representative array type, possibly nested within a | |
5502 | padding record e.g. for alignment purposes. */ | |
5503 | ||
315cff15 | 5504 | if (TYPE_IS_PADDING_P (rep_type)) |
7948ae37 OH |
5505 | rep_type = TREE_TYPE (TYPE_FIELDS (rep_type)); |
5506 | ||
5507 | if (TREE_CODE (rep_type) != ARRAY_TYPE) | |
5508 | { | |
5509 | error ("attribute %qs applies to array types only", | |
5510 | IDENTIFIER_POINTER (name)); | |
5511 | return NULL_TREE; | |
5512 | } | |
5513 | ||
5514 | /* Silently punt on variable sizes. We can't make vector types for them, | |
5515 | need to ignore them on front-end generated subtypes of unconstrained | |
5516 | bases, and this attribute is for binding implementors, not end-users, so | |
5517 | we should never get there from legitimate explicit uses. */ | |
5518 | ||
5519 | if (!host_integerp (rep_size, 1)) | |
5520 | return NULL_TREE; | |
5521 | ||
5522 | /* Get the element type/mode and check this is something we know | |
5523 | how to make vectors of. */ | |
5524 | ||
5525 | elem_type = TREE_TYPE (rep_type); | |
5526 | elem_mode = TYPE_MODE (elem_type); | |
5527 | ||
5528 | if ((!INTEGRAL_TYPE_P (elem_type) | |
5529 | && !SCALAR_FLOAT_TYPE_P (elem_type) | |
5530 | && !FIXED_POINT_TYPE_P (elem_type)) | |
5531 | || (!SCALAR_FLOAT_MODE_P (elem_mode) | |
5532 | && GET_MODE_CLASS (elem_mode) != MODE_INT | |
5533 | && !ALL_SCALAR_FIXED_POINT_MODE_P (elem_mode)) | |
5534 | || !host_integerp (TYPE_SIZE_UNIT (elem_type), 1)) | |
5535 | { | |
5536 | error ("invalid element type for attribute %qs", | |
5537 | IDENTIFIER_POINTER (name)); | |
5538 | return NULL_TREE; | |
5539 | } | |
5540 | ||
5541 | /* Sanity check the vector size and element type consistency. */ | |
5542 | ||
5543 | vec_bytes = tree_low_cst (rep_size, 1); | |
5544 | ||
5545 | if (vec_bytes % tree_low_cst (TYPE_SIZE_UNIT (elem_type), 1)) | |
5546 | { | |
5547 | error ("vector size not an integral multiple of component size"); | |
5548 | return NULL; | |
5549 | } | |
5550 | ||
5551 | if (vec_bytes == 0) | |
5552 | { | |
5553 | error ("zero vector size"); | |
5554 | return NULL; | |
5555 | } | |
5556 | ||
5557 | vec_units = vec_bytes / tree_low_cst (TYPE_SIZE_UNIT (elem_type), 1); | |
5558 | if (vec_units & (vec_units - 1)) | |
5559 | { | |
5560 | error ("number of components of the vector not a power of two"); | |
5561 | return NULL_TREE; | |
5562 | } | |
5563 | ||
5564 | /* Build the vector type and replace. */ | |
5565 | ||
5566 | *node = build_vector_type (elem_type, vec_units); | |
5567 | rep_name = TYPE_NAME (rep_type); | |
5568 | if (TREE_CODE (rep_name) == TYPE_DECL) | |
5569 | rep_name = DECL_NAME (rep_name); | |
5570 | TYPE_NAME (*node) = rep_name; | |
5571 | TYPE_REPRESENTATIVE_ARRAY (*node) = rep_type; | |
5572 | ||
5573 | return NULL_TREE; | |
5574 | } | |
5575 | ||
a1ab4c31 AC |
5576 | /* ----------------------------------------------------------------------- * |
5577 | * BUILTIN FUNCTIONS * | |
5578 | * ----------------------------------------------------------------------- */ | |
5579 | ||
5580 | /* Worker for DEF_BUILTIN. Possibly define a builtin function with one or two | |
5581 | names. Does not declare a non-__builtin_ function if flag_no_builtin, or | |
5582 | if nonansi_p and flag_no_nonansi_builtin. */ | |
5583 | ||
5584 | static void | |
5585 | def_builtin_1 (enum built_in_function fncode, | |
5586 | const char *name, | |
5587 | enum built_in_class fnclass, | |
5588 | tree fntype, tree libtype, | |
5589 | bool both_p, bool fallback_p, | |
5590 | bool nonansi_p ATTRIBUTE_UNUSED, | |
5591 | tree fnattrs, bool implicit_p) | |
5592 | { | |
5593 | tree decl; | |
5594 | const char *libname; | |
5595 | ||
5596 | /* Preserve an already installed decl. It most likely was setup in advance | |
5597 | (e.g. as part of the internal builtins) for specific reasons. */ | |
5598 | if (built_in_decls[(int) fncode] != NULL_TREE) | |
5599 | return; | |
5600 | ||
5601 | gcc_assert ((!both_p && !fallback_p) | |
5602 | || !strncmp (name, "__builtin_", | |
5603 | strlen ("__builtin_"))); | |
5604 | ||
5605 | libname = name + strlen ("__builtin_"); | |
5606 | decl = add_builtin_function (name, fntype, fncode, fnclass, | |
5607 | (fallback_p ? libname : NULL), | |
5608 | fnattrs); | |
5609 | if (both_p) | |
5610 | /* ??? This is normally further controlled by command-line options | |
5611 | like -fno-builtin, but we don't have them for Ada. */ | |
5612 | add_builtin_function (libname, libtype, fncode, fnclass, | |
5613 | NULL, fnattrs); | |
5614 | ||
5615 | built_in_decls[(int) fncode] = decl; | |
5616 | if (implicit_p) | |
5617 | implicit_built_in_decls[(int) fncode] = decl; | |
5618 | } | |
5619 | ||
5620 | static int flag_isoc94 = 0; | |
5621 | static int flag_isoc99 = 0; | |
5622 | ||
5623 | /* Install what the common builtins.def offers. */ | |
5624 | ||
5625 | static void | |
5626 | install_builtin_functions (void) | |
5627 | { | |
5628 | #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \ | |
5629 | NONANSI_P, ATTRS, IMPLICIT, COND) \ | |
5630 | if (NAME && COND) \ | |
5631 | def_builtin_1 (ENUM, NAME, CLASS, \ | |
5632 | builtin_types[(int) TYPE], \ | |
5633 | builtin_types[(int) LIBTYPE], \ | |
5634 | BOTH_P, FALLBACK_P, NONANSI_P, \ | |
5635 | built_in_attributes[(int) ATTRS], IMPLICIT); | |
5636 | #include "builtins.def" | |
5637 | #undef DEF_BUILTIN | |
5638 | } | |
5639 | ||
5640 | /* ----------------------------------------------------------------------- * | |
5641 | * BUILTIN FUNCTIONS * | |
5642 | * ----------------------------------------------------------------------- */ | |
5643 | ||
5644 | /* Install the builtin functions we might need. */ | |
5645 | ||
5646 | void | |
5647 | gnat_install_builtins (void) | |
5648 | { | |
5649 | install_builtin_elementary_types (); | |
5650 | install_builtin_function_types (); | |
5651 | install_builtin_attributes (); | |
5652 | ||
5653 | /* Install builtins used by generic middle-end pieces first. Some of these | |
5654 | know about internal specificities and control attributes accordingly, for | |
5655 | instance __builtin_alloca vs no-throw and -fstack-check. We will ignore | |
5656 | the generic definition from builtins.def. */ | |
384c400a | 5657 | build_common_builtin_nodes (); |
a1ab4c31 AC |
5658 | |
5659 | /* Now, install the target specific builtins, such as the AltiVec family on | |
5660 | ppc, and the common set as exposed by builtins.def. */ | |
5661 | targetm.init_builtins (); | |
5662 | install_builtin_functions (); | |
5663 | } | |
5664 | ||
5665 | #include "gt-ada-utils.h" | |
5666 | #include "gtype-ada.h" |