1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2008, Free Software Foundation, Inc. *
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/>. *
21 * GNAT was originally developed by the GNAT team at New York University. *
22 * Extensive contributions were provided by Ada Core Technologies Inc. *
24 ****************************************************************************/
26 /* We have attribute handlers using C specific format specifiers in warning
27 messages. Make sure they are properly recognized. */
28 #define GCC_DIAG_STYLE __gcc_cdiag__
32 #include "coretypes.h"
45 #include "tree-inline.h"
46 #include "tree-gimple.h"
47 #include "tree-dump.h"
48 #include "pointer-set.h"
49 #include "langhooks.h"
65 #ifndef MAX_FIXED_MODE_SIZE
66 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
69 #ifndef MAX_BITS_PER_WORD
70 #define MAX_BITS_PER_WORD BITS_PER_WORD
73 /* If nonzero, pretend we are allocating at global level. */
76 /* Tree nodes for the various types and decls we create. */
77 tree gnat_std_decls[(int) ADT_LAST];
79 /* Functions to call for each of the possible raise reasons. */
80 tree gnat_raise_decls[(int) LAST_REASON_CODE + 1];
82 /* Forward declarations for handlers of attributes. */
83 static tree handle_const_attribute (tree *, tree, tree, int, bool *);
84 static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *);
85 static tree handle_pure_attribute (tree *, tree, tree, int, bool *);
86 static tree handle_novops_attribute (tree *, tree, tree, int, bool *);
87 static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *);
88 static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *);
89 static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
90 static tree handle_malloc_attribute (tree *, tree, tree, int, bool *);
91 static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *);
93 /* Fake handler for attributes we don't properly support, typically because
94 they'd require dragging a lot of the common-c front-end circuitry. */
95 static tree fake_attribute_handler (tree *, tree, tree, int, bool *);
97 /* Table of machine-independent internal attributes for Ada. We support
98 this minimal set ot attributes to accomodate the needs of builtins. */
99 const struct attribute_spec gnat_internal_attribute_table[] =
101 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
102 { "const", 0, 0, true, false, false, handle_const_attribute },
103 { "nothrow", 0, 0, true, false, false, handle_nothrow_attribute },
104 { "pure", 0, 0, true, false, false, handle_pure_attribute },
105 { "no vops", 0, 0, true, false, false, handle_novops_attribute },
106 { "nonnull", 0, -1, false, true, true, handle_nonnull_attribute },
107 { "sentinel", 0, 1, false, true, true, handle_sentinel_attribute },
108 { "noreturn", 0, 0, true, false, false, handle_noreturn_attribute },
109 { "malloc", 0, 0, true, false, false, handle_malloc_attribute },
110 { "type generic", 0, 0, false, true, true, handle_type_generic_attribute },
112 /* ??? format and format_arg are heavy and not supported, which actually
113 prevents support for stdio builtins, which we however declare as part
114 of the common builtins.def contents. */
115 { "format", 3, 3, false, true, true, fake_attribute_handler },
116 { "format_arg", 1, 1, false, true, true, fake_attribute_handler },
118 { NULL, 0, 0, false, false, false, NULL }
121 /* Associates a GNAT tree node to a GCC tree node. It is used in
122 `save_gnu_tree', `get_gnu_tree' and `present_gnu_tree'. See documentation
123 of `save_gnu_tree' for more info. */
124 static GTY((length ("max_gnat_nodes"))) tree *associate_gnat_to_gnu;
126 #define GET_GNU_TREE(GNAT_ENTITY) \
127 associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id]
129 #define SET_GNU_TREE(GNAT_ENTITY,VAL) \
130 associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] = (VAL)
132 #define PRESENT_GNU_TREE(GNAT_ENTITY) \
133 (associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE)
135 /* Associates a GNAT entity to a GCC tree node used as a dummy, if any. */
136 static GTY((length ("max_gnat_nodes"))) tree *dummy_node_table;
138 #define GET_DUMMY_NODE(GNAT_ENTITY) \
139 dummy_node_table[(GNAT_ENTITY) - First_Node_Id]
141 #define SET_DUMMY_NODE(GNAT_ENTITY,VAL) \
142 dummy_node_table[(GNAT_ENTITY) - First_Node_Id] = (VAL)
144 #define PRESENT_DUMMY_NODE(GNAT_ENTITY) \
145 (dummy_node_table[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE)
147 /* This variable keeps a table for types for each precision so that we only
148 allocate each of them once. Signed and unsigned types are kept separate.
150 Note that these types are only used when fold-const requests something
151 special. Perhaps we should NOT share these types; we'll see how it
153 static GTY(()) tree signed_and_unsigned_types[2 * MAX_BITS_PER_WORD + 1][2];
155 /* Likewise for float types, but record these by mode. */
156 static GTY(()) tree float_types[NUM_MACHINE_MODES];
158 /* For each binding contour we allocate a binding_level structure to indicate
159 the binding depth. */
161 struct gnat_binding_level GTY((chain_next ("%h.chain")))
163 /* The binding level containing this one (the enclosing binding level). */
164 struct gnat_binding_level *chain;
165 /* The BLOCK node for this level. */
167 /* If nonzero, the setjmp buffer that needs to be updated for any
168 variable-sized definition within this context. */
172 /* The binding level currently in effect. */
173 static GTY(()) struct gnat_binding_level *current_binding_level;
175 /* A chain of gnat_binding_level structures awaiting reuse. */
176 static GTY((deletable)) struct gnat_binding_level *free_binding_level;
178 /* An array of global declarations. */
179 static GTY(()) VEC(tree,gc) *global_decls;
181 /* An array of builtin function declarations. */
182 static GTY(()) VEC(tree,gc) *builtin_decls;
184 /* An array of global renaming pointers. */
185 static GTY(()) VEC(tree,gc) *global_renaming_pointers;
187 /* A chain of unused BLOCK nodes. */
188 static GTY((deletable)) tree free_block_chain;
190 static void gnat_install_builtins (void);
191 static tree merge_sizes (tree, tree, tree, bool, bool);
192 static tree compute_related_constant (tree, tree);
193 static tree split_plus (tree, tree *);
194 static void gnat_gimplify_function (tree);
195 static tree float_type_for_precision (int, enum machine_mode);
196 static tree convert_to_fat_pointer (tree, tree);
197 static tree convert_to_thin_pointer (tree, tree);
198 static tree make_descriptor_field (const char *,tree, tree, tree);
199 static bool potential_alignment_gap (tree, tree, tree);
201 /* Initialize the association of GNAT nodes to GCC trees. */
204 init_gnat_to_gnu (void)
206 associate_gnat_to_gnu
207 = (tree *) ggc_alloc_cleared (max_gnat_nodes * sizeof (tree));
210 /* GNAT_ENTITY is a GNAT tree node for an entity. GNU_DECL is the GCC tree
211 which is to be associated with GNAT_ENTITY. Such GCC tree node is always
212 a ..._DECL node. If NO_CHECK is nonzero, the latter check is suppressed.
214 If GNU_DECL is zero, a previous association is to be reset. */
217 save_gnu_tree (Entity_Id gnat_entity, tree gnu_decl, bool no_check)
219 /* Check that GNAT_ENTITY is not already defined and that it is being set
220 to something which is a decl. Raise gigi 401 if not. Usually, this
221 means GNAT_ENTITY is defined twice, but occasionally is due to some
223 gcc_assert (!(gnu_decl
224 && (PRESENT_GNU_TREE (gnat_entity)
225 || (!no_check && !DECL_P (gnu_decl)))));
227 SET_GNU_TREE (gnat_entity, gnu_decl);
230 /* GNAT_ENTITY is a GNAT tree node for a defining identifier.
231 Return the ..._DECL node that was associated with it. If there is no tree
232 node associated with GNAT_ENTITY, abort.
234 In some cases, such as delayed elaboration or expressions that need to
235 be elaborated only once, GNAT_ENTITY is really not an entity. */
238 get_gnu_tree (Entity_Id gnat_entity)
240 gcc_assert (PRESENT_GNU_TREE (gnat_entity));
241 return GET_GNU_TREE (gnat_entity);
244 /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */
247 present_gnu_tree (Entity_Id gnat_entity)
249 return PRESENT_GNU_TREE (gnat_entity);
252 /* Initialize the association of GNAT nodes to GCC trees as dummies. */
255 init_dummy_type (void)
258 = (tree *) ggc_alloc_cleared (max_gnat_nodes * sizeof (tree));
261 /* Make a dummy type corresponding to GNAT_TYPE. */
264 make_dummy_type (Entity_Id gnat_type)
266 Entity_Id gnat_underlying = Gigi_Equivalent_Type (gnat_type);
269 /* If there is an equivalent type, get its underlying type. */
270 if (Present (gnat_underlying))
271 gnat_underlying = Underlying_Type (gnat_underlying);
273 /* If there was no equivalent type (can only happen when just annotating
274 types) or underlying type, go back to the original type. */
275 if (No (gnat_underlying))
276 gnat_underlying = gnat_type;
278 /* If it there already a dummy type, use that one. Else make one. */
279 if (PRESENT_DUMMY_NODE (gnat_underlying))
280 return GET_DUMMY_NODE (gnat_underlying);
282 /* If this is a record, make a RECORD_TYPE or UNION_TYPE; else make
284 gnu_type = make_node (Is_Record_Type (gnat_underlying)
285 ? tree_code_for_record_type (gnat_underlying)
287 TYPE_NAME (gnu_type) = get_entity_name (gnat_type);
288 TYPE_DUMMY_P (gnu_type) = 1;
289 if (AGGREGATE_TYPE_P (gnu_type))
291 TYPE_STUB_DECL (gnu_type) = build_decl (TYPE_DECL, NULL_TREE, gnu_type);
292 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_type);
295 SET_DUMMY_NODE (gnat_underlying, gnu_type);
300 /* Return nonzero if we are currently in the global binding level. */
303 global_bindings_p (void)
305 return ((force_global || !current_function_decl) ? -1 : 0);
308 /* Enter a new binding level. */
313 struct gnat_binding_level *newlevel = NULL;
315 /* Reuse a struct for this binding level, if there is one. */
316 if (free_binding_level)
318 newlevel = free_binding_level;
319 free_binding_level = free_binding_level->chain;
323 = (struct gnat_binding_level *)
324 ggc_alloc (sizeof (struct gnat_binding_level));
326 /* Use a free BLOCK, if any; otherwise, allocate one. */
327 if (free_block_chain)
329 newlevel->block = free_block_chain;
330 free_block_chain = BLOCK_CHAIN (free_block_chain);
331 BLOCK_CHAIN (newlevel->block) = NULL_TREE;
334 newlevel->block = make_node (BLOCK);
336 /* Point the BLOCK we just made to its parent. */
337 if (current_binding_level)
338 BLOCK_SUPERCONTEXT (newlevel->block) = current_binding_level->block;
340 BLOCK_VARS (newlevel->block) = BLOCK_SUBBLOCKS (newlevel->block) = NULL_TREE;
341 TREE_USED (newlevel->block) = 1;
343 /* Add this level to the front of the chain (stack) of levels that are
345 newlevel->chain = current_binding_level;
346 newlevel->jmpbuf_decl = NULL_TREE;
347 current_binding_level = newlevel;
350 /* Set SUPERCONTEXT of the BLOCK for the current binding level to FNDECL
351 and point FNDECL to this BLOCK. */
354 set_current_block_context (tree fndecl)
356 BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl;
357 DECL_INITIAL (fndecl) = current_binding_level->block;
360 /* Set the jmpbuf_decl for the current binding level to DECL. */
363 set_block_jmpbuf_decl (tree decl)
365 current_binding_level->jmpbuf_decl = decl;
368 /* Get the jmpbuf_decl, if any, for the current binding level. */
371 get_block_jmpbuf_decl ()
373 return current_binding_level->jmpbuf_decl;
376 /* Exit a binding level. Set any BLOCK into the current code group. */
381 struct gnat_binding_level *level = current_binding_level;
382 tree block = level->block;
384 BLOCK_VARS (block) = nreverse (BLOCK_VARS (block));
385 BLOCK_SUBBLOCKS (block) = nreverse (BLOCK_SUBBLOCKS (block));
387 /* If this is a function-level BLOCK don't do anything. Otherwise, if there
388 are no variables free the block and merge its subblocks into those of its
389 parent block. Otherwise, add it to the list of its parent. */
390 if (TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL)
392 else if (BLOCK_VARS (block) == NULL_TREE)
394 BLOCK_SUBBLOCKS (level->chain->block)
395 = chainon (BLOCK_SUBBLOCKS (block),
396 BLOCK_SUBBLOCKS (level->chain->block));
397 BLOCK_CHAIN (block) = free_block_chain;
398 free_block_chain = block;
402 BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (level->chain->block);
403 BLOCK_SUBBLOCKS (level->chain->block) = block;
404 TREE_USED (block) = 1;
405 set_block_for_group (block);
408 /* Free this binding structure. */
409 current_binding_level = level->chain;
410 level->chain = free_binding_level;
411 free_binding_level = level;
415 /* Records a ..._DECL node DECL as belonging to the current lexical scope
416 and uses GNAT_NODE for location information and propagating flags. */
419 gnat_pushdecl (tree decl, Node_Id gnat_node)
421 /* If at top level, there is no context. But PARM_DECLs always go in the
422 level of its function. */
423 if (global_bindings_p () && TREE_CODE (decl) != PARM_DECL)
424 DECL_CONTEXT (decl) = 0;
427 DECL_CONTEXT (decl) = current_function_decl;
429 /* Functions imported in another function are not really nested. */
430 if (TREE_CODE (decl) == FUNCTION_DECL && TREE_PUBLIC (decl))
431 DECL_NO_STATIC_CHAIN (decl) = 1;
434 TREE_NO_WARNING (decl) = (gnat_node == Empty || Warnings_Off (gnat_node));
436 /* Set the location of DECL and emit a declaration for it. */
437 if (Present (gnat_node))
438 Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (decl));
439 add_decl_expr (decl, gnat_node);
441 /* Put the declaration on the list. The list of declarations is in reverse
442 order. The list will be reversed later. Put global variables in the
443 globals list and builtin functions in a dedicated list to speed up
444 further lookups. Don't put TYPE_DECLs for UNCONSTRAINED_ARRAY_TYPE into
445 the list, as they will cause trouble with the debugger and aren't needed
447 if (TREE_CODE (decl) != TYPE_DECL
448 || TREE_CODE (TREE_TYPE (decl)) != UNCONSTRAINED_ARRAY_TYPE)
450 if (global_bindings_p ())
452 VEC_safe_push (tree, gc, global_decls, decl);
454 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
455 VEC_safe_push (tree, gc, builtin_decls, decl);
459 TREE_CHAIN (decl) = BLOCK_VARS (current_binding_level->block);
460 BLOCK_VARS (current_binding_level->block) = decl;
464 /* For the declaration of a type, set its name if it either is not already
465 set, was set to an IDENTIFIER_NODE, indicating an internal name,
466 or if the previous type name was not derived from a source name.
467 We'd rather have the type named with a real name and all the pointer
468 types to the same object have the same POINTER_TYPE node. Code in the
469 equivalent function of c-decl.c makes a copy of the type node here, but
470 that may cause us trouble with incomplete types. We make an exception
471 for fat pointer types because the compiler automatically builds them
472 for unconstrained array types and the debugger uses them to represent
473 both these and pointers to these. */
474 if (TREE_CODE (decl) == TYPE_DECL && DECL_NAME (decl))
476 tree t = TREE_TYPE (decl);
478 if (!TYPE_NAME (t) || TREE_CODE (TYPE_NAME (t)) == IDENTIFIER_NODE)
480 else if (TYPE_FAT_POINTER_P (t))
482 tree tt = build_variant_type_copy (t);
483 TYPE_NAME (tt) = decl;
484 TREE_USED (tt) = TREE_USED (t);
485 TREE_TYPE (decl) = tt;
486 DECL_ORIGINAL_TYPE (decl) = t;
489 else if (DECL_ARTIFICIAL (TYPE_NAME (t)) && !DECL_ARTIFICIAL (decl))
494 /* Propagate the name to all the variants. This is needed for
495 the type qualifiers machinery to work properly. */
497 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
498 TYPE_NAME (t) = decl;
502 /* Do little here. Set up the standard declarations later after the
503 front end has been run. */
506 gnat_init_decl_processing (void)
508 /* Make the binding_level structure for global names. */
509 current_function_decl = 0;
510 current_binding_level = 0;
511 free_binding_level = 0;
514 build_common_tree_nodes (true, true);
516 /* In Ada, we use a signed type for SIZETYPE. Use the signed type
517 corresponding to the size of Pmode. In most cases when ptr_mode and
518 Pmode differ, C will use the width of ptr_mode as sizetype. But we get
519 far better code using the width of Pmode. Make this here since we need
520 this before we can expand the GNAT types. */
521 size_type_node = gnat_type_for_size (GET_MODE_BITSIZE (Pmode), 0);
522 set_sizetype (size_type_node);
523 build_common_tree_nodes_2 (0);
525 ptr_void_type_node = build_pointer_type (void_type_node);
528 /* Create the predefined scalar types such as `integer_type_node' needed
529 in the gcc back-end and initialize the global binding level. */
532 init_gigi_decls (tree long_long_float_type, tree exception_type)
537 /* Set the types that GCC and Gigi use from the front end. We would like
538 to do this for char_type_node, but it needs to correspond to the C
540 if (TREE_CODE (TREE_TYPE (long_long_float_type)) == INTEGER_TYPE)
542 /* In this case, the builtin floating point types are VAX float,
543 so make up a type for use. */
544 longest_float_type_node = make_node (REAL_TYPE);
545 TYPE_PRECISION (longest_float_type_node) = LONG_DOUBLE_TYPE_SIZE;
546 layout_type (longest_float_type_node);
547 create_type_decl (get_identifier ("longest float type"),
548 longest_float_type_node, NULL, false, true, Empty);
551 longest_float_type_node = TREE_TYPE (long_long_float_type);
553 except_type_node = TREE_TYPE (exception_type);
555 unsigned_type_node = gnat_type_for_size (INT_TYPE_SIZE, 1);
556 create_type_decl (get_identifier ("unsigned int"), unsigned_type_node,
557 NULL, false, true, Empty);
559 void_type_decl_node = create_type_decl (get_identifier ("void"),
560 void_type_node, NULL, false, true,
563 void_ftype = build_function_type (void_type_node, NULL_TREE);
564 ptr_void_ftype = build_pointer_type (void_ftype);
566 /* Build the special descriptor type and its null node if needed. */
567 if (TARGET_VTABLE_USES_DESCRIPTORS)
569 tree field_list = NULL_TREE, null_list = NULL_TREE;
572 fdesc_type_node = make_node (RECORD_TYPE);
574 for (j = 0; j < TARGET_VTABLE_USES_DESCRIPTORS; j++)
576 tree field = create_field_decl (NULL_TREE, ptr_void_ftype,
577 fdesc_type_node, 0, 0, 0, 1);
578 TREE_CHAIN (field) = field_list;
580 null_list = tree_cons (field, null_pointer_node, null_list);
583 finish_record_type (fdesc_type_node, nreverse (field_list), 0, false);
584 null_fdesc_node = gnat_build_constructor (fdesc_type_node, null_list);
587 /* Now declare runtime functions. */
588 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
590 /* malloc is a function declaration tree for a function to allocate
592 malloc_decl = create_subprog_decl (get_identifier ("__gnat_malloc"),
594 build_function_type (ptr_void_type_node,
595 tree_cons (NULL_TREE,
598 NULL_TREE, false, true, true, NULL,
600 DECL_IS_MALLOC (malloc_decl) = 1;
602 /* malloc32 is a function declaration tree for a function to allocate
603 32bit memory on a 64bit system. Needed only on 64bit VMS. */
604 malloc32_decl = create_subprog_decl (get_identifier ("__gnat_malloc32"),
606 build_function_type (ptr_void_type_node,
607 tree_cons (NULL_TREE,
610 NULL_TREE, false, true, true, NULL,
612 DECL_IS_MALLOC (malloc32_decl) = 1;
614 /* free is a function declaration tree for a function to free memory. */
616 = create_subprog_decl (get_identifier ("__gnat_free"), NULL_TREE,
617 build_function_type (void_type_node,
618 tree_cons (NULL_TREE,
621 NULL_TREE, false, true, true, NULL, Empty);
623 /* Make the types and functions used for exception processing. */
625 = build_array_type (gnat_type_for_mode (Pmode, 0),
626 build_index_type (build_int_cst (NULL_TREE, 5)));
627 create_type_decl (get_identifier ("JMPBUF_T"), jmpbuf_type, NULL,
629 jmpbuf_ptr_type = build_pointer_type (jmpbuf_type);
631 /* Functions to get and set the jumpbuf pointer for the current thread. */
633 = create_subprog_decl
634 (get_identifier ("system__soft_links__get_jmpbuf_address_soft"),
635 NULL_TREE, build_function_type (jmpbuf_ptr_type, NULL_TREE),
636 NULL_TREE, false, true, true, NULL, Empty);
637 /* Avoid creating superfluous edges to __builtin_setjmp receivers. */
638 DECL_IS_PURE (get_jmpbuf_decl) = 1;
641 = create_subprog_decl
642 (get_identifier ("system__soft_links__set_jmpbuf_address_soft"),
644 build_function_type (void_type_node,
645 tree_cons (NULL_TREE, jmpbuf_ptr_type, endlink)),
646 NULL_TREE, false, true, true, NULL, Empty);
648 /* Function to get the current exception. */
650 = create_subprog_decl
651 (get_identifier ("system__soft_links__get_gnat_exception"),
653 build_function_type (build_pointer_type (except_type_node), NULL_TREE),
654 NULL_TREE, false, true, true, NULL, Empty);
655 /* Avoid creating superfluous edges to __builtin_setjmp receivers. */
656 DECL_IS_PURE (get_excptr_decl) = 1;
658 /* Functions that raise exceptions. */
660 = create_subprog_decl
661 (get_identifier ("__gnat_raise_nodefer_with_msg"), NULL_TREE,
662 build_function_type (void_type_node,
663 tree_cons (NULL_TREE,
664 build_pointer_type (except_type_node),
666 NULL_TREE, false, true, true, NULL, Empty);
668 /* Dummy objects to materialize "others" and "all others" in the exception
669 tables. These are exported by a-exexpr.adb, so see this unit for the
673 = create_var_decl (get_identifier ("OTHERS"),
674 get_identifier ("__gnat_others_value"),
675 integer_type_node, 0, 1, 0, 1, 1, 0, Empty);
678 = create_var_decl (get_identifier ("ALL_OTHERS"),
679 get_identifier ("__gnat_all_others_value"),
680 integer_type_node, 0, 1, 0, 1, 1, 0, Empty);
682 /* Hooks to call when entering/leaving an exception handler. */
684 = create_subprog_decl (get_identifier ("__gnat_begin_handler"), NULL_TREE,
685 build_function_type (void_type_node,
686 tree_cons (NULL_TREE,
689 NULL_TREE, false, true, true, NULL, Empty);
692 = create_subprog_decl (get_identifier ("__gnat_end_handler"), NULL_TREE,
693 build_function_type (void_type_node,
694 tree_cons (NULL_TREE,
697 NULL_TREE, false, true, true, NULL, Empty);
699 /* If in no exception handlers mode, all raise statements are redirected to
700 __gnat_last_chance_handler. No need to redefine raise_nodefer_decl, since
701 this procedure will never be called in this mode. */
702 if (No_Exception_Handlers_Set ())
705 = create_subprog_decl
706 (get_identifier ("__gnat_last_chance_handler"), NULL_TREE,
707 build_function_type (void_type_node,
708 tree_cons (NULL_TREE,
709 build_pointer_type (char_type_node),
710 tree_cons (NULL_TREE,
713 NULL_TREE, false, true, true, NULL, Empty);
715 for (i = 0; i < ARRAY_SIZE (gnat_raise_decls); i++)
716 gnat_raise_decls[i] = decl;
719 /* Otherwise, make one decl for each exception reason. */
720 for (i = 0; i < ARRAY_SIZE (gnat_raise_decls); i++)
724 sprintf (name, "__gnat_rcheck_%.2d", i);
726 = create_subprog_decl
727 (get_identifier (name), NULL_TREE,
728 build_function_type (void_type_node,
729 tree_cons (NULL_TREE,
732 tree_cons (NULL_TREE,
735 NULL_TREE, false, true, true, NULL, Empty);
738 /* Indicate that these never return. */
739 TREE_THIS_VOLATILE (raise_nodefer_decl) = 1;
740 TREE_SIDE_EFFECTS (raise_nodefer_decl) = 1;
741 TREE_TYPE (raise_nodefer_decl)
742 = build_qualified_type (TREE_TYPE (raise_nodefer_decl),
745 for (i = 0; i < ARRAY_SIZE (gnat_raise_decls); i++)
747 TREE_THIS_VOLATILE (gnat_raise_decls[i]) = 1;
748 TREE_SIDE_EFFECTS (gnat_raise_decls[i]) = 1;
749 TREE_TYPE (gnat_raise_decls[i])
750 = build_qualified_type (TREE_TYPE (gnat_raise_decls[i]),
754 /* setjmp returns an integer and has one operand, which is a pointer to
757 = create_subprog_decl
758 (get_identifier ("__builtin_setjmp"), NULL_TREE,
759 build_function_type (integer_type_node,
760 tree_cons (NULL_TREE, jmpbuf_ptr_type, endlink)),
761 NULL_TREE, false, true, true, NULL, Empty);
763 DECL_BUILT_IN_CLASS (setjmp_decl) = BUILT_IN_NORMAL;
764 DECL_FUNCTION_CODE (setjmp_decl) = BUILT_IN_SETJMP;
766 /* update_setjmp_buf updates a setjmp buffer from the current stack pointer
768 update_setjmp_buf_decl
769 = create_subprog_decl
770 (get_identifier ("__builtin_update_setjmp_buf"), NULL_TREE,
771 build_function_type (void_type_node,
772 tree_cons (NULL_TREE, jmpbuf_ptr_type, endlink)),
773 NULL_TREE, false, true, true, NULL, Empty);
775 DECL_BUILT_IN_CLASS (update_setjmp_buf_decl) = BUILT_IN_NORMAL;
776 DECL_FUNCTION_CODE (update_setjmp_buf_decl) = BUILT_IN_UPDATE_SETJMP_BUF;
778 main_identifier_node = get_identifier ("main");
780 /* Install the builtins we might need, either internally or as
781 user available facilities for Intrinsic imports. */
782 gnat_install_builtins ();
785 /* Given a record type RECORD_TYPE and a chain of FIELD_DECL nodes FIELDLIST,
786 finish constructing the record or union type. If REP_LEVEL is zero, this
787 record has no representation clause and so will be entirely laid out here.
788 If REP_LEVEL is one, this record has a representation clause and has been
789 laid out already; only set the sizes and alignment. If REP_LEVEL is two,
790 this record is derived from a parent record and thus inherits its layout;
791 only make a pass on the fields to finalize them. If DO_NOT_FINALIZE is
792 true, the record type is expected to be modified afterwards so it will
793 not be sent to the back-end for finalization. */
796 finish_record_type (tree record_type, tree fieldlist, int rep_level,
797 bool do_not_finalize)
799 enum tree_code code = TREE_CODE (record_type);
800 tree name = TYPE_NAME (record_type);
801 tree ada_size = bitsize_zero_node;
802 tree size = bitsize_zero_node;
803 bool had_size = TYPE_SIZE (record_type) != 0;
804 bool had_size_unit = TYPE_SIZE_UNIT (record_type) != 0;
805 bool had_align = TYPE_ALIGN (record_type) != 0;
808 if (name && TREE_CODE (name) == TYPE_DECL)
809 name = DECL_NAME (name);
811 TYPE_FIELDS (record_type) = fieldlist;
812 TYPE_STUB_DECL (record_type) = build_decl (TYPE_DECL, name, record_type);
814 /* We don't need both the typedef name and the record name output in
815 the debugging information, since they are the same. */
816 DECL_ARTIFICIAL (TYPE_STUB_DECL (record_type)) = 1;
818 /* Globally initialize the record first. If this is a rep'ed record,
819 that just means some initializations; otherwise, layout the record. */
822 TYPE_ALIGN (record_type) = MAX (BITS_PER_UNIT, TYPE_ALIGN (record_type));
823 TYPE_MODE (record_type) = BLKmode;
826 TYPE_SIZE_UNIT (record_type) = size_zero_node;
828 TYPE_SIZE (record_type) = bitsize_zero_node;
830 /* For all-repped records with a size specified, lay the QUAL_UNION_TYPE
831 out just like a UNION_TYPE, since the size will be fixed. */
832 else if (code == QUAL_UNION_TYPE)
837 /* Ensure there isn't a size already set. There can be in an error
838 case where there is a rep clause but all fields have errors and
839 no longer have a position. */
840 TYPE_SIZE (record_type) = 0;
841 layout_type (record_type);
844 /* At this point, the position and size of each field is known. It was
845 either set before entry by a rep clause, or by laying out the type above.
847 We now run a pass over the fields (in reverse order for QUAL_UNION_TYPEs)
848 to compute the Ada size; the GCC size and alignment (for rep'ed records
849 that are not padding types); and the mode (for rep'ed records). We also
850 clear the DECL_BIT_FIELD indication for the cases we know have not been
851 handled yet, and adjust DECL_NONADDRESSABLE_P accordingly. */
853 if (code == QUAL_UNION_TYPE)
854 fieldlist = nreverse (fieldlist);
856 for (field = fieldlist; field; field = TREE_CHAIN (field))
858 tree type = TREE_TYPE (field);
859 tree pos = bit_position (field);
860 tree this_size = DECL_SIZE (field);
863 if ((TREE_CODE (type) == RECORD_TYPE
864 || TREE_CODE (type) == UNION_TYPE
865 || TREE_CODE (type) == QUAL_UNION_TYPE)
866 && !TYPE_IS_FAT_POINTER_P (type)
867 && !TYPE_CONTAINS_TEMPLATE_P (type)
868 && TYPE_ADA_SIZE (type))
869 this_ada_size = TYPE_ADA_SIZE (type);
871 this_ada_size = this_size;
873 /* Clear DECL_BIT_FIELD for the cases layout_decl does not handle. */
874 if (DECL_BIT_FIELD (field)
875 && operand_equal_p (this_size, TYPE_SIZE (type), 0))
877 unsigned int align = TYPE_ALIGN (type);
879 /* In the general case, type alignment is required. */
880 if (value_factor_p (pos, align))
882 /* The enclosing record type must be sufficiently aligned.
883 Otherwise, if no alignment was specified for it and it
884 has been laid out already, bump its alignment to the
885 desired one if this is compatible with its size. */
886 if (TYPE_ALIGN (record_type) >= align)
888 DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align);
889 DECL_BIT_FIELD (field) = 0;
893 && value_factor_p (TYPE_SIZE (record_type), align))
895 TYPE_ALIGN (record_type) = align;
896 DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align);
897 DECL_BIT_FIELD (field) = 0;
901 /* In the non-strict alignment case, only byte alignment is. */
902 if (!STRICT_ALIGNMENT
903 && DECL_BIT_FIELD (field)
904 && value_factor_p (pos, BITS_PER_UNIT))
905 DECL_BIT_FIELD (field) = 0;
908 /* If we still have DECL_BIT_FIELD set at this point, we know the field
909 is technically not addressable. Except that it can actually be
910 addressed if the field is BLKmode and happens to be properly
912 DECL_NONADDRESSABLE_P (field)
913 |= DECL_BIT_FIELD (field) && DECL_MODE (field) != BLKmode;
915 /* A type must be as aligned as its most aligned field that is not
916 a bit-field. But this is already enforced by layout_type. */
917 if (rep_level > 0 && !DECL_BIT_FIELD (field))
918 TYPE_ALIGN (record_type)
919 = MAX (TYPE_ALIGN (record_type), DECL_ALIGN (field));
924 ada_size = size_binop (MAX_EXPR, ada_size, this_ada_size);
925 size = size_binop (MAX_EXPR, size, this_size);
928 case QUAL_UNION_TYPE:
930 = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field),
931 this_ada_size, ada_size);
932 size = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field),
937 /* Since we know here that all fields are sorted in order of
938 increasing bit position, the size of the record is one
939 higher than the ending bit of the last field processed
940 unless we have a rep clause, since in that case we might
941 have a field outside a QUAL_UNION_TYPE that has a higher ending
942 position. So use a MAX in that case. Also, if this field is a
943 QUAL_UNION_TYPE, we need to take into account the previous size in
944 the case of empty variants. */
946 = merge_sizes (ada_size, pos, this_ada_size,
947 TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0);
949 = merge_sizes (size, pos, this_size,
950 TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0);
958 if (code == QUAL_UNION_TYPE)
959 nreverse (fieldlist);
963 /* If this is a padding record, we never want to make the size smaller
964 than what was specified in it, if any. */
965 if (TREE_CODE (record_type) == RECORD_TYPE
966 && TYPE_IS_PADDING_P (record_type) && TYPE_SIZE (record_type))
967 size = TYPE_SIZE (record_type);
969 /* Now set any of the values we've just computed that apply. */
970 if (!TYPE_IS_FAT_POINTER_P (record_type)
971 && !TYPE_CONTAINS_TEMPLATE_P (record_type))
972 SET_TYPE_ADA_SIZE (record_type, ada_size);
976 tree size_unit = had_size_unit
977 ? TYPE_SIZE_UNIT (record_type)
979 size_binop (CEIL_DIV_EXPR, size,
981 unsigned int align = TYPE_ALIGN (record_type);
983 TYPE_SIZE (record_type) = variable_size (round_up (size, align));
984 TYPE_SIZE_UNIT (record_type)
985 = variable_size (round_up (size_unit, align / BITS_PER_UNIT));
987 compute_record_mode (record_type);
991 if (!do_not_finalize)
992 rest_of_record_type_compilation (record_type);
995 /* Wrap up compilation of RECORD_TYPE, i.e. most notably output all
996 the debug information associated with it. It need not be invoked
997 directly in most cases since finish_record_type takes care of doing
998 so, unless explicitly requested not to through DO_NOT_FINALIZE. */
1001 rest_of_record_type_compilation (tree record_type)
1003 tree fieldlist = TYPE_FIELDS (record_type);
1005 enum tree_code code = TREE_CODE (record_type);
1006 bool var_size = false;
1008 for (field = fieldlist; field; field = TREE_CHAIN (field))
1010 /* We need to make an XVE/XVU record if any field has variable size,
1011 whether or not the record does. For example, if we have a union,
1012 it may be that all fields, rounded up to the alignment, have the
1013 same size, in which case we'll use that size. But the debug
1014 output routines (except Dwarf2) won't be able to output the fields,
1015 so we need to make the special record. */
1016 if (TREE_CODE (DECL_SIZE (field)) != INTEGER_CST
1017 /* If a field has a non-constant qualifier, the record will have
1018 variable size too. */
1019 || (code == QUAL_UNION_TYPE
1020 && TREE_CODE (DECL_QUALIFIER (field)) != INTEGER_CST))
1027 /* If this record is of variable size, rename it so that the
1028 debugger knows it is and make a new, parallel, record
1029 that tells the debugger how the record is laid out. See
1030 exp_dbug.ads. But don't do this for records that are padding
1031 since they confuse GDB. */
1033 && !(TREE_CODE (record_type) == RECORD_TYPE
1034 && TYPE_IS_PADDING_P (record_type)))
1036 tree new_record_type
1037 = make_node (TREE_CODE (record_type) == QUAL_UNION_TYPE
1038 ? UNION_TYPE : TREE_CODE (record_type));
1039 tree orig_name = TYPE_NAME (record_type);
1041 = (TREE_CODE (orig_name) == TYPE_DECL ? DECL_NAME (orig_name)
1044 = concat_id_with_name (orig_id,
1045 TREE_CODE (record_type) == QUAL_UNION_TYPE
1047 tree last_pos = bitsize_zero_node;
1049 tree prev_old_field = 0;
1051 TYPE_NAME (new_record_type) = new_id;
1052 TYPE_ALIGN (new_record_type) = BIGGEST_ALIGNMENT;
1053 TYPE_STUB_DECL (new_record_type)
1054 = build_decl (TYPE_DECL, new_id, new_record_type);
1055 DECL_ARTIFICIAL (TYPE_STUB_DECL (new_record_type)) = 1;
1056 DECL_IGNORED_P (TYPE_STUB_DECL (new_record_type))
1057 = DECL_IGNORED_P (TYPE_STUB_DECL (record_type));
1058 TYPE_SIZE (new_record_type) = size_int (TYPE_ALIGN (record_type));
1059 TYPE_SIZE_UNIT (new_record_type)
1060 = size_int (TYPE_ALIGN (record_type) / BITS_PER_UNIT);
1062 /* Now scan all the fields, replacing each field with a new
1063 field corresponding to the new encoding. */
1064 for (old_field = TYPE_FIELDS (record_type); old_field;
1065 old_field = TREE_CHAIN (old_field))
1067 tree field_type = TREE_TYPE (old_field);
1068 tree field_name = DECL_NAME (old_field);
1070 tree curpos = bit_position (old_field);
1072 unsigned int align = 0;
1075 /* See how the position was modified from the last position.
1077 There are two basic cases we support: a value was added
1078 to the last position or the last position was rounded to
1079 a boundary and they something was added. Check for the
1080 first case first. If not, see if there is any evidence
1081 of rounding. If so, round the last position and try
1084 If this is a union, the position can be taken as zero. */
1086 if (TREE_CODE (new_record_type) == UNION_TYPE)
1087 pos = bitsize_zero_node, align = 0;
1089 pos = compute_related_constant (curpos, last_pos);
1091 if (!pos && TREE_CODE (curpos) == MULT_EXPR
1092 && host_integerp (TREE_OPERAND (curpos, 1), 1))
1094 tree offset = TREE_OPERAND (curpos, 0);
1095 align = tree_low_cst (TREE_OPERAND (curpos, 1), 1);
1097 /* Strip off any conversions. */
1098 while (TREE_CODE (offset) == NON_LVALUE_EXPR
1099 || TREE_CODE (offset) == NOP_EXPR
1100 || TREE_CODE (offset) == CONVERT_EXPR)
1101 offset = TREE_OPERAND (offset, 0);
1103 /* An offset which is a bitwise AND with a negative power of 2
1104 means an alignment corresponding to this power of 2. */
1105 if (TREE_CODE (offset) == BIT_AND_EXPR
1106 && host_integerp (TREE_OPERAND (offset, 1), 0)
1107 && tree_int_cst_sgn (TREE_OPERAND (offset, 1)) < 0)
1110 = - tree_low_cst (TREE_OPERAND (offset, 1), 0);
1111 if (exact_log2 (pow) > 0)
1115 pos = compute_related_constant (curpos,
1116 round_up (last_pos, align));
1118 else if (!pos && TREE_CODE (curpos) == PLUS_EXPR
1119 && TREE_CODE (TREE_OPERAND (curpos, 1)) == INTEGER_CST
1120 && TREE_CODE (TREE_OPERAND (curpos, 0)) == MULT_EXPR
1121 && host_integerp (TREE_OPERAND
1122 (TREE_OPERAND (curpos, 0), 1),
1127 (TREE_OPERAND (TREE_OPERAND (curpos, 0), 1), 1);
1128 pos = compute_related_constant (curpos,
1129 round_up (last_pos, align));
1131 else if (potential_alignment_gap (prev_old_field, old_field,
1134 align = TYPE_ALIGN (field_type);
1135 pos = compute_related_constant (curpos,
1136 round_up (last_pos, align));
1139 /* If we can't compute a position, set it to zero.
1141 ??? We really should abort here, but it's too much work
1142 to get this correct for all cases. */
1145 pos = bitsize_zero_node;
1147 /* See if this type is variable-sized and make a pointer type
1148 and indicate the indirection if so. Beware that the debug
1149 back-end may adjust the position computed above according
1150 to the alignment of the field type, i.e. the pointer type
1151 in this case, if we don't preventively counter that. */
1152 if (TREE_CODE (DECL_SIZE (old_field)) != INTEGER_CST)
1154 field_type = build_pointer_type (field_type);
1155 if (align != 0 && TYPE_ALIGN (field_type) > align)
1157 field_type = copy_node (field_type);
1158 TYPE_ALIGN (field_type) = align;
1163 /* Make a new field name, if necessary. */
1164 if (var || align != 0)
1169 sprintf (suffix, "XV%c%u", var ? 'L' : 'A',
1170 align / BITS_PER_UNIT);
1172 strcpy (suffix, "XVL");
1174 field_name = concat_id_with_name (field_name, suffix);
1177 new_field = create_field_decl (field_name, field_type,
1179 DECL_SIZE (old_field), pos, 0);
1180 TREE_CHAIN (new_field) = TYPE_FIELDS (new_record_type);
1181 TYPE_FIELDS (new_record_type) = new_field;
1183 /* If old_field is a QUAL_UNION_TYPE, take its size as being
1184 zero. The only time it's not the last field of the record
1185 is when there are other components at fixed positions after
1186 it (meaning there was a rep clause for every field) and we
1187 want to be able to encode them. */
1188 last_pos = size_binop (PLUS_EXPR, bit_position (old_field),
1189 (TREE_CODE (TREE_TYPE (old_field))
1192 : DECL_SIZE (old_field));
1193 prev_old_field = old_field;
1196 TYPE_FIELDS (new_record_type)
1197 = nreverse (TYPE_FIELDS (new_record_type));
1199 rest_of_type_decl_compilation (TYPE_STUB_DECL (new_record_type));
1202 rest_of_type_decl_compilation (TYPE_STUB_DECL (record_type));
1205 /* Utility function of above to merge LAST_SIZE, the previous size of a record
1206 with FIRST_BIT and SIZE that describe a field. SPECIAL is nonzero
1207 if this represents a QUAL_UNION_TYPE in which case we must look for
1208 COND_EXPRs and replace a value of zero with the old size. If HAS_REP
1209 is nonzero, we must take the MAX of the end position of this field
1210 with LAST_SIZE. In all other cases, we use FIRST_BIT plus SIZE.
1212 We return an expression for the size. */
1215 merge_sizes (tree last_size, tree first_bit, tree size, bool special,
1218 tree type = TREE_TYPE (last_size);
1221 if (!special || TREE_CODE (size) != COND_EXPR)
1223 new = size_binop (PLUS_EXPR, first_bit, size);
1225 new = size_binop (MAX_EXPR, last_size, new);
1229 new = fold_build3 (COND_EXPR, type, TREE_OPERAND (size, 0),
1230 integer_zerop (TREE_OPERAND (size, 1))
1231 ? last_size : merge_sizes (last_size, first_bit,
1232 TREE_OPERAND (size, 1),
1234 integer_zerop (TREE_OPERAND (size, 2))
1235 ? last_size : merge_sizes (last_size, first_bit,
1236 TREE_OPERAND (size, 2),
1239 /* We don't need any NON_VALUE_EXPRs and they can confuse us (especially
1240 when fed through substitute_in_expr) into thinking that a constant
1241 size is not constant. */
1242 while (TREE_CODE (new) == NON_LVALUE_EXPR)
1243 new = TREE_OPERAND (new, 0);
1248 /* Utility function of above to see if OP0 and OP1, both of SIZETYPE, are
1249 related by the addition of a constant. Return that constant if so. */
1252 compute_related_constant (tree op0, tree op1)
1254 tree op0_var, op1_var;
1255 tree op0_con = split_plus (op0, &op0_var);
1256 tree op1_con = split_plus (op1, &op1_var);
1257 tree result = size_binop (MINUS_EXPR, op0_con, op1_con);
1259 if (operand_equal_p (op0_var, op1_var, 0))
1261 else if (operand_equal_p (op0, size_binop (PLUS_EXPR, op1_var, result), 0))
1267 /* Utility function of above to split a tree OP which may be a sum, into a
1268 constant part, which is returned, and a variable part, which is stored
1269 in *PVAR. *PVAR may be bitsize_zero_node. All operations must be of
1273 split_plus (tree in, tree *pvar)
1275 /* Strip NOPS in order to ease the tree traversal and maximize the
1276 potential for constant or plus/minus discovery. We need to be careful
1277 to always return and set *pvar to bitsizetype trees, but it's worth
1281 *pvar = convert (bitsizetype, in);
1283 if (TREE_CODE (in) == INTEGER_CST)
1285 *pvar = bitsize_zero_node;
1286 return convert (bitsizetype, in);
1288 else if (TREE_CODE (in) == PLUS_EXPR || TREE_CODE (in) == MINUS_EXPR)
1290 tree lhs_var, rhs_var;
1291 tree lhs_con = split_plus (TREE_OPERAND (in, 0), &lhs_var);
1292 tree rhs_con = split_plus (TREE_OPERAND (in, 1), &rhs_var);
1294 if (lhs_var == TREE_OPERAND (in, 0)
1295 && rhs_var == TREE_OPERAND (in, 1))
1296 return bitsize_zero_node;
1298 *pvar = size_binop (TREE_CODE (in), lhs_var, rhs_var);
1299 return size_binop (TREE_CODE (in), lhs_con, rhs_con);
1302 return bitsize_zero_node;
1305 /* Return a FUNCTION_TYPE node. RETURN_TYPE is the type returned by the
1306 subprogram. If it is void_type_node, then we are dealing with a procedure,
1307 otherwise we are dealing with a function. PARAM_DECL_LIST is a list of
1308 PARM_DECL nodes that are the subprogram arguments. CICO_LIST is the
1309 copy-in/copy-out list to be stored into TYPE_CICO_LIST.
1310 RETURNS_UNCONSTRAINED is true if the function returns an unconstrained
1311 object. RETURNS_BY_REF is true if the function returns by reference.
1312 RETURNS_BY_TARGET_PTR is true if the function is to be passed (as its
1313 first parameter) the address of the place to copy its result. */
1316 create_subprog_type (tree return_type, tree param_decl_list, tree cico_list,
1317 bool returns_unconstrained, bool returns_by_ref,
1318 bool returns_by_target_ptr)
1320 /* A chain of TREE_LIST nodes whose TREE_VALUEs are the data type nodes of
1321 the subprogram formal parameters. This list is generated by traversing the
1322 input list of PARM_DECL nodes. */
1323 tree param_type_list = NULL;
1327 for (param_decl = param_decl_list; param_decl;
1328 param_decl = TREE_CHAIN (param_decl))
1329 param_type_list = tree_cons (NULL_TREE, TREE_TYPE (param_decl),
1332 /* The list of the function parameter types has to be terminated by the void
1333 type to signal to the back-end that we are not dealing with a variable
1334 parameter subprogram, but that the subprogram has a fixed number of
1336 param_type_list = tree_cons (NULL_TREE, void_type_node, param_type_list);
1338 /* The list of argument types has been created in reverse
1340 param_type_list = nreverse (param_type_list);
1342 type = build_function_type (return_type, param_type_list);
1344 /* TYPE may have been shared since GCC hashes types. If it has a CICO_LIST
1345 or the new type should, make a copy of TYPE. Likewise for
1346 RETURNS_UNCONSTRAINED and RETURNS_BY_REF. */
1347 if (TYPE_CI_CO_LIST (type) || cico_list
1348 || TYPE_RETURNS_UNCONSTRAINED_P (type) != returns_unconstrained
1349 || TYPE_RETURNS_BY_REF_P (type) != returns_by_ref
1350 || TYPE_RETURNS_BY_TARGET_PTR_P (type) != returns_by_target_ptr)
1351 type = copy_type (type);
1353 TYPE_CI_CO_LIST (type) = cico_list;
1354 TYPE_RETURNS_UNCONSTRAINED_P (type) = returns_unconstrained;
1355 TYPE_RETURNS_BY_REF_P (type) = returns_by_ref;
1356 TYPE_RETURNS_BY_TARGET_PTR_P (type) = returns_by_target_ptr;
1360 /* Return a copy of TYPE but safe to modify in any way. */
1363 copy_type (tree type)
1365 tree new = copy_node (type);
1367 /* copy_node clears this field instead of copying it, because it is
1368 aliased with TREE_CHAIN. */
1369 TYPE_STUB_DECL (new) = TYPE_STUB_DECL (type);
1371 TYPE_POINTER_TO (new) = 0;
1372 TYPE_REFERENCE_TO (new) = 0;
1373 TYPE_MAIN_VARIANT (new) = new;
1374 TYPE_NEXT_VARIANT (new) = 0;
1379 /* Return an INTEGER_TYPE of SIZETYPE with range MIN to MAX and whose
1380 TYPE_INDEX_TYPE is INDEX. GNAT_NODE is used for the position of
1384 create_index_type (tree min, tree max, tree index, Node_Id gnat_node)
1386 /* First build a type for the desired range. */
1387 tree type = build_index_2_type (min, max);
1389 /* If this type has the TYPE_INDEX_TYPE we want, return it. Otherwise, if it
1390 doesn't have TYPE_INDEX_TYPE set, set it to INDEX. If TYPE_INDEX_TYPE
1391 is set, but not to INDEX, make a copy of this type with the requested
1392 index type. Note that we have no way of sharing these types, but that's
1393 only a small hole. */
1394 if (TYPE_INDEX_TYPE (type) == index)
1396 else if (TYPE_INDEX_TYPE (type))
1397 type = copy_type (type);
1399 SET_TYPE_INDEX_TYPE (type, index);
1400 create_type_decl (NULL_TREE, type, NULL, true, false, gnat_node);
1404 /* Return a TYPE_DECL node. TYPE_NAME gives the name of the type (a character
1405 string) and TYPE is a ..._TYPE node giving its data type.
1406 ARTIFICIAL_P is true if this is a declaration that was generated
1407 by the compiler. DEBUG_INFO_P is true if we need to write debugging
1408 information about this type. GNAT_NODE is used for the position of
1412 create_type_decl (tree type_name, tree type, struct attrib *attr_list,
1413 bool artificial_p, bool debug_info_p, Node_Id gnat_node)
1415 tree type_decl = build_decl (TYPE_DECL, type_name, type);
1416 enum tree_code code = TREE_CODE (type);
1418 DECL_ARTIFICIAL (type_decl) = artificial_p;
1420 if (!TYPE_IS_DUMMY_P (type))
1421 gnat_pushdecl (type_decl, gnat_node);
1423 process_attributes (type_decl, attr_list);
1425 /* Pass type declaration information to the debugger unless this is an
1426 UNCONSTRAINED_ARRAY_TYPE, which the debugger does not support,
1427 and ENUMERAL_TYPE or RECORD_TYPE which is handled separately, or
1428 type for which debugging information was not requested. */
1429 if (code == UNCONSTRAINED_ARRAY_TYPE || !debug_info_p)
1430 DECL_IGNORED_P (type_decl) = 1;
1431 else if (code != ENUMERAL_TYPE
1432 && (code != RECORD_TYPE || TYPE_IS_FAT_POINTER_P (type))
1433 && !((code == POINTER_TYPE || code == REFERENCE_TYPE)
1434 && TYPE_IS_DUMMY_P (TREE_TYPE (type))))
1435 rest_of_type_decl_compilation (type_decl);
1440 /* Return a VAR_DECL or CONST_DECL node.
1442 VAR_NAME gives the name of the variable. ASM_NAME is its assembler name
1443 (if provided). TYPE is its data type (a GCC ..._TYPE node). VAR_INIT is
1444 the GCC tree for an optional initial expression; NULL_TREE if none.
1446 CONST_FLAG is true if this variable is constant, in which case we might
1447 return a CONST_DECL node unless CONST_DECL_ALLOWED_P is false.
1449 PUBLIC_FLAG is true if this definition is to be made visible outside of
1450 the current compilation unit. This flag should be set when processing the
1451 variable definitions in a package specification.
1453 EXTERN_FLAG is nonzero when processing an external variable declaration (as
1454 opposed to a definition: no storage is to be allocated for the variable).
1456 STATIC_FLAG is only relevant when not at top level. In that case
1457 it indicates whether to always allocate storage to the variable.
1459 GNAT_NODE is used for the position of the decl. */
1462 create_var_decl_1 (tree var_name, tree asm_name, tree type, tree var_init,
1463 bool const_flag, bool public_flag, bool extern_flag,
1464 bool static_flag, bool const_decl_allowed_p,
1465 struct attrib *attr_list, Node_Id gnat_node)
1469 && gnat_types_compatible_p (type, TREE_TYPE (var_init))
1470 && (global_bindings_p () || static_flag
1471 ? initializer_constant_valid_p (var_init, TREE_TYPE (var_init)) != 0
1472 : TREE_CONSTANT (var_init)));
1474 /* Whether we will make TREE_CONSTANT the DECL we produce here, in which
1475 case the initializer may be used in-lieu of the DECL node (as done in
1476 Identifier_to_gnu). This is useful to prevent the need of elaboration
1477 code when an identifier for which such a decl is made is in turn used as
1478 an initializer. We used to rely on CONST vs VAR_DECL for this purpose,
1479 but extra constraints apply to this choice (see below) and are not
1480 relevant to the distinction we wish to make. */
1481 bool constant_p = const_flag && init_const;
1483 /* The actual DECL node. CONST_DECL was initially intended for enumerals
1484 and may be used for scalars in general but not for aggregates. */
1486 = build_decl ((constant_p && const_decl_allowed_p
1487 && !AGGREGATE_TYPE_P (type)) ? CONST_DECL : VAR_DECL,
1490 /* If this is external, throw away any initializations (they will be done
1491 elsewhere) unless this is a constant for which we would like to remain
1492 able to get the initializer. If we are defining a global here, leave a
1493 constant initialization and save any variable elaborations for the
1494 elaboration routine. If we are just annotating types, throw away the
1495 initialization if it isn't a constant. */
1496 if ((extern_flag && !constant_p)
1497 || (type_annotate_only && var_init && !TREE_CONSTANT (var_init)))
1498 var_init = NULL_TREE;
1500 /* At the global level, an initializer requiring code to be generated
1501 produces elaboration statements. Check that such statements are allowed,
1502 that is, not violating a No_Elaboration_Code restriction. */
1503 if (global_bindings_p () && var_init != 0 && ! init_const)
1504 Check_Elaboration_Code_Allowed (gnat_node);
1506 /* Ada doesn't feature Fortran-like COMMON variables so we shouldn't
1507 try to fiddle with DECL_COMMON. However, on platforms that don't
1508 support global BSS sections, uninitialized global variables would
1509 go in DATA instead, thus increasing the size of the executable. */
1511 && TREE_CODE (var_decl) == VAR_DECL
1512 && !have_global_bss_p ())
1513 DECL_COMMON (var_decl) = 1;
1514 DECL_INITIAL (var_decl) = var_init;
1515 TREE_READONLY (var_decl) = const_flag;
1516 DECL_EXTERNAL (var_decl) = extern_flag;
1517 TREE_PUBLIC (var_decl) = public_flag || extern_flag;
1518 TREE_CONSTANT (var_decl) = constant_p;
1519 TREE_THIS_VOLATILE (var_decl) = TREE_SIDE_EFFECTS (var_decl)
1520 = TYPE_VOLATILE (type);
1522 /* If it's public and not external, always allocate storage for it.
1523 At the global binding level we need to allocate static storage for the
1524 variable if and only if it's not external. If we are not at the top level
1525 we allocate automatic storage unless requested not to. */
1526 TREE_STATIC (var_decl)
1527 = public_flag || (global_bindings_p () ? !extern_flag : static_flag);
1529 if (asm_name && VAR_OR_FUNCTION_DECL_P (var_decl))
1530 SET_DECL_ASSEMBLER_NAME (var_decl, asm_name);
1532 process_attributes (var_decl, attr_list);
1534 /* Add this decl to the current binding level. */
1535 gnat_pushdecl (var_decl, gnat_node);
1537 if (TREE_SIDE_EFFECTS (var_decl))
1538 TREE_ADDRESSABLE (var_decl) = 1;
1540 if (TREE_CODE (var_decl) != CONST_DECL)
1542 if (global_bindings_p ())
1543 rest_of_decl_compilation (var_decl, true, 0);
1546 expand_decl (var_decl);
1551 /* Return true if TYPE, an aggregate type, contains (or is) an array. */
1554 aggregate_type_contains_array_p (tree type)
1556 switch (TREE_CODE (type))
1560 case QUAL_UNION_TYPE:
1563 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1564 if (AGGREGATE_TYPE_P (TREE_TYPE (field))
1565 && aggregate_type_contains_array_p (TREE_TYPE (field)))
1578 /* Returns a FIELD_DECL node. FIELD_NAME the field name, FIELD_TYPE is its
1579 type, and RECORD_TYPE is the type of the parent. PACKED is nonzero if
1580 this field is in a record type with a "pragma pack". If SIZE is nonzero
1581 it is the specified size for this field. If POS is nonzero, it is the bit
1582 position. If ADDRESSABLE is nonzero, it means we are allowed to take
1583 the address of this field for aliasing purposes. If it is negative, we
1584 should not make a bitfield, which is used by make_aligning_type. */
1587 create_field_decl (tree field_name, tree field_type, tree record_type,
1588 int packed, tree size, tree pos, int addressable)
1590 tree field_decl = build_decl (FIELD_DECL, field_name, field_type);
1592 DECL_CONTEXT (field_decl) = record_type;
1593 TREE_READONLY (field_decl) = TYPE_READONLY (field_type);
1595 /* If FIELD_TYPE is BLKmode, we must ensure this is aligned to at least a
1596 byte boundary since GCC cannot handle less-aligned BLKmode bitfields.
1597 Likewise for an aggregate without specified position that contains an
1598 array, because in this case slices of variable length of this array
1599 must be handled by GCC and variable-sized objects need to be aligned
1600 to at least a byte boundary. */
1601 if (packed && (TYPE_MODE (field_type) == BLKmode
1603 && AGGREGATE_TYPE_P (field_type)
1604 && aggregate_type_contains_array_p (field_type))))
1605 DECL_ALIGN (field_decl) = BITS_PER_UNIT;
1607 /* If a size is specified, use it. Otherwise, if the record type is packed
1608 compute a size to use, which may differ from the object's natural size.
1609 We always set a size in this case to trigger the checks for bitfield
1610 creation below, which is typically required when no position has been
1613 size = convert (bitsizetype, size);
1614 else if (packed == 1)
1616 size = rm_size (field_type);
1618 /* For a constant size larger than MAX_FIXED_MODE_SIZE, round up to
1620 if (TREE_CODE (size) == INTEGER_CST
1621 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) > 0)
1622 size = round_up (size, BITS_PER_UNIT);
1625 /* If we may, according to ADDRESSABLE, make a bitfield if a size is
1626 specified for two reasons: first if the size differs from the natural
1627 size. Second, if the alignment is insufficient. There are a number of
1628 ways the latter can be true.
1630 We never make a bitfield if the type of the field has a nonconstant size,
1631 because no such entity requiring bitfield operations should reach here.
1633 We do *preventively* make a bitfield when there might be the need for it
1634 but we don't have all the necessary information to decide, as is the case
1635 of a field with no specified position in a packed record.
1637 We also don't look at STRICT_ALIGNMENT here, and rely on later processing
1638 in layout_decl or finish_record_type to clear the bit_field indication if
1639 it is in fact not needed. */
1640 if (addressable >= 0
1642 && TREE_CODE (size) == INTEGER_CST
1643 && TREE_CODE (TYPE_SIZE (field_type)) == INTEGER_CST
1644 && (!tree_int_cst_equal (size, TYPE_SIZE (field_type))
1645 || (pos && !value_factor_p (pos, TYPE_ALIGN (field_type)))
1647 || (TYPE_ALIGN (record_type) != 0
1648 && TYPE_ALIGN (record_type) < TYPE_ALIGN (field_type))))
1650 DECL_BIT_FIELD (field_decl) = 1;
1651 DECL_SIZE (field_decl) = size;
1652 if (!packed && !pos)
1653 DECL_ALIGN (field_decl)
1654 = (TYPE_ALIGN (record_type) != 0
1655 ? MIN (TYPE_ALIGN (record_type), TYPE_ALIGN (field_type))
1656 : TYPE_ALIGN (field_type));
1659 DECL_PACKED (field_decl) = pos ? DECL_BIT_FIELD (field_decl) : packed;
1661 /* Bump the alignment if need be, either for bitfield/packing purposes or
1662 to satisfy the type requirements if no such consideration applies. When
1663 we get the alignment from the type, indicate if this is from an explicit
1664 user request, which prevents stor-layout from lowering it later on. */
1667 = (DECL_BIT_FIELD (field_decl) ? 1
1668 : packed && TYPE_MODE (field_type) != BLKmode ? BITS_PER_UNIT : 0);
1670 if (bit_align > DECL_ALIGN (field_decl))
1671 DECL_ALIGN (field_decl) = bit_align;
1672 else if (!bit_align && TYPE_ALIGN (field_type) > DECL_ALIGN (field_decl))
1674 DECL_ALIGN (field_decl) = TYPE_ALIGN (field_type);
1675 DECL_USER_ALIGN (field_decl) = TYPE_USER_ALIGN (field_type);
1681 /* We need to pass in the alignment the DECL is known to have.
1682 This is the lowest-order bit set in POS, but no more than
1683 the alignment of the record, if one is specified. Note
1684 that an alignment of 0 is taken as infinite. */
1685 unsigned int known_align;
1687 if (host_integerp (pos, 1))
1688 known_align = tree_low_cst (pos, 1) & - tree_low_cst (pos, 1);
1690 known_align = BITS_PER_UNIT;
1692 if (TYPE_ALIGN (record_type)
1693 && (known_align == 0 || known_align > TYPE_ALIGN (record_type)))
1694 known_align = TYPE_ALIGN (record_type);
1696 layout_decl (field_decl, known_align);
1697 SET_DECL_OFFSET_ALIGN (field_decl,
1698 host_integerp (pos, 1) ? BIGGEST_ALIGNMENT
1700 pos_from_bit (&DECL_FIELD_OFFSET (field_decl),
1701 &DECL_FIELD_BIT_OFFSET (field_decl),
1702 DECL_OFFSET_ALIGN (field_decl), pos);
1704 DECL_HAS_REP_P (field_decl) = 1;
1707 /* In addition to what our caller says, claim the field is addressable if we
1708 know that its type is not suitable.
1710 The field may also be "technically" nonaddressable, meaning that even if
1711 we attempt to take the field's address we will actually get the address
1712 of a copy. This is the case for true bitfields, but the DECL_BIT_FIELD
1713 value we have at this point is not accurate enough, so we don't account
1714 for this here and let finish_record_type decide. */
1715 if (!type_for_nonaliased_component_p (field_type))
1718 DECL_NONADDRESSABLE_P (field_decl) = !addressable;
1723 /* Returns a PARM_DECL node. PARAM_NAME is the name of the parameter,
1724 PARAM_TYPE is its type. READONLY is true if the parameter is
1725 readonly (either an In parameter or an address of a pass-by-ref
1729 create_param_decl (tree param_name, tree param_type, bool readonly)
1731 tree param_decl = build_decl (PARM_DECL, param_name, param_type);
1733 /* Honor targetm.calls.promote_prototypes(), as not doing so can
1734 lead to various ABI violations. */
1735 if (targetm.calls.promote_prototypes (param_type)
1736 && (TREE_CODE (param_type) == INTEGER_TYPE
1737 || TREE_CODE (param_type) == ENUMERAL_TYPE)
1738 && TYPE_PRECISION (param_type) < TYPE_PRECISION (integer_type_node))
1740 /* We have to be careful about biased types here. Make a subtype
1741 of integer_type_node with the proper biasing. */
1742 if (TREE_CODE (param_type) == INTEGER_TYPE
1743 && TYPE_BIASED_REPRESENTATION_P (param_type))
1746 = copy_type (build_range_type (integer_type_node,
1747 TYPE_MIN_VALUE (param_type),
1748 TYPE_MAX_VALUE (param_type)));
1750 TYPE_BIASED_REPRESENTATION_P (param_type) = 1;
1753 param_type = integer_type_node;
1756 DECL_ARG_TYPE (param_decl) = param_type;
1757 TREE_READONLY (param_decl) = readonly;
1761 /* Given a DECL and ATTR_LIST, process the listed attributes. */
1764 process_attributes (tree decl, struct attrib *attr_list)
1766 for (; attr_list; attr_list = attr_list->next)
1767 switch (attr_list->type)
1769 case ATTR_MACHINE_ATTRIBUTE:
1770 decl_attributes (&decl, tree_cons (attr_list->name, attr_list->args,
1772 ATTR_FLAG_TYPE_IN_PLACE);
1775 case ATTR_LINK_ALIAS:
1776 if (! DECL_EXTERNAL (decl))
1778 TREE_STATIC (decl) = 1;
1779 assemble_alias (decl, attr_list->name);
1783 case ATTR_WEAK_EXTERNAL:
1785 declare_weak (decl);
1787 post_error ("?weak declarations not supported on this target",
1788 attr_list->error_point);
1791 case ATTR_LINK_SECTION:
1792 if (targetm.have_named_sections)
1794 DECL_SECTION_NAME (decl)
1795 = build_string (IDENTIFIER_LENGTH (attr_list->name),
1796 IDENTIFIER_POINTER (attr_list->name));
1797 DECL_COMMON (decl) = 0;
1800 post_error ("?section attributes are not supported for this target",
1801 attr_list->error_point);
1804 case ATTR_LINK_CONSTRUCTOR:
1805 DECL_STATIC_CONSTRUCTOR (decl) = 1;
1806 TREE_USED (decl) = 1;
1809 case ATTR_LINK_DESTRUCTOR:
1810 DECL_STATIC_DESTRUCTOR (decl) = 1;
1811 TREE_USED (decl) = 1;
1816 /* Record a global renaming pointer. */
1819 record_global_renaming_pointer (tree decl)
1821 gcc_assert (DECL_RENAMED_OBJECT (decl));
1822 VEC_safe_push (tree, gc, global_renaming_pointers, decl);
1825 /* Invalidate the global renaming pointers. */
1828 invalidate_global_renaming_pointers (void)
1833 for (i = 0; VEC_iterate(tree, global_renaming_pointers, i, iter); i++)
1834 SET_DECL_RENAMED_OBJECT (iter, NULL_TREE);
1836 VEC_free (tree, gc, global_renaming_pointers);
1839 /* Return true if VALUE is a known to be a multiple of FACTOR, which must be
1843 value_factor_p (tree value, HOST_WIDE_INT factor)
1845 if (host_integerp (value, 1))
1846 return tree_low_cst (value, 1) % factor == 0;
1848 if (TREE_CODE (value) == MULT_EXPR)
1849 return (value_factor_p (TREE_OPERAND (value, 0), factor)
1850 || value_factor_p (TREE_OPERAND (value, 1), factor));
1855 /* Given 2 consecutive field decls PREV_FIELD and CURR_FIELD, return true
1856 unless we can prove these 2 fields are laid out in such a way that no gap
1857 exist between the end of PREV_FIELD and the beginning of CURR_FIELD. OFFSET
1858 is the distance in bits between the end of PREV_FIELD and the starting
1859 position of CURR_FIELD. It is ignored if null. */
1862 potential_alignment_gap (tree prev_field, tree curr_field, tree offset)
1864 /* If this is the first field of the record, there cannot be any gap */
1868 /* If the previous field is a union type, then return False: The only
1869 time when such a field is not the last field of the record is when
1870 there are other components at fixed positions after it (meaning there
1871 was a rep clause for every field), in which case we don't want the
1872 alignment constraint to override them. */
1873 if (TREE_CODE (TREE_TYPE (prev_field)) == QUAL_UNION_TYPE)
1876 /* If the distance between the end of prev_field and the beginning of
1877 curr_field is constant, then there is a gap if the value of this
1878 constant is not null. */
1879 if (offset && host_integerp (offset, 1))
1880 return !integer_zerop (offset);
1882 /* If the size and position of the previous field are constant,
1883 then check the sum of this size and position. There will be a gap
1884 iff it is not multiple of the current field alignment. */
1885 if (host_integerp (DECL_SIZE (prev_field), 1)
1886 && host_integerp (bit_position (prev_field), 1))
1887 return ((tree_low_cst (bit_position (prev_field), 1)
1888 + tree_low_cst (DECL_SIZE (prev_field), 1))
1889 % DECL_ALIGN (curr_field) != 0);
1891 /* If both the position and size of the previous field are multiples
1892 of the current field alignment, there cannot be any gap. */
1893 if (value_factor_p (bit_position (prev_field), DECL_ALIGN (curr_field))
1894 && value_factor_p (DECL_SIZE (prev_field), DECL_ALIGN (curr_field)))
1897 /* Fallback, return that there may be a potential gap */
1901 /* Returns a LABEL_DECL node for LABEL_NAME. */
1904 create_label_decl (tree label_name)
1906 tree label_decl = build_decl (LABEL_DECL, label_name, void_type_node);
1908 DECL_CONTEXT (label_decl) = current_function_decl;
1909 DECL_MODE (label_decl) = VOIDmode;
1910 DECL_SOURCE_LOCATION (label_decl) = input_location;
1915 /* Returns a FUNCTION_DECL node. SUBPROG_NAME is the name of the subprogram,
1916 ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE
1917 node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of
1918 PARM_DECL nodes chained through the TREE_CHAIN field).
1920 INLINE_FLAG, PUBLIC_FLAG, EXTERN_FLAG, and ATTR_LIST are used to set the
1921 appropriate fields in the FUNCTION_DECL. GNAT_NODE gives the location. */
1924 create_subprog_decl (tree subprog_name, tree asm_name,
1925 tree subprog_type, tree param_decl_list, bool inline_flag,
1926 bool public_flag, bool extern_flag,
1927 struct attrib *attr_list, Node_Id gnat_node)
1929 tree return_type = TREE_TYPE (subprog_type);
1930 tree subprog_decl = build_decl (FUNCTION_DECL, subprog_name, subprog_type);
1932 /* If this is a function nested inside an inlined external function, it
1933 means we aren't going to compile the outer function unless it is
1934 actually inlined, so do the same for us. */
1935 if (current_function_decl && DECL_INLINE (current_function_decl)
1936 && DECL_EXTERNAL (current_function_decl))
1939 DECL_EXTERNAL (subprog_decl) = extern_flag;
1940 TREE_PUBLIC (subprog_decl) = public_flag;
1941 TREE_STATIC (subprog_decl) = 1;
1942 TREE_READONLY (subprog_decl) = TYPE_READONLY (subprog_type);
1943 TREE_THIS_VOLATILE (subprog_decl) = TYPE_VOLATILE (subprog_type);
1944 TREE_SIDE_EFFECTS (subprog_decl) = TYPE_VOLATILE (subprog_type);
1945 DECL_ARGUMENTS (subprog_decl) = param_decl_list;
1946 DECL_RESULT (subprog_decl) = build_decl (RESULT_DECL, 0, return_type);
1947 DECL_ARTIFICIAL (DECL_RESULT (subprog_decl)) = 1;
1948 DECL_IGNORED_P (DECL_RESULT (subprog_decl)) = 1;
1950 /* TREE_ADDRESSABLE is set on the result type to request the use of the
1951 target by-reference return mechanism. This is not supported all the
1952 way down to RTL expansion with GCC 4, which ICEs on temporary creation
1953 attempts with such a type and expects DECL_BY_REFERENCE to be set on
1954 the RESULT_DECL instead - see gnat_genericize for more details. */
1955 if (TREE_ADDRESSABLE (TREE_TYPE (DECL_RESULT (subprog_decl))))
1957 tree result_decl = DECL_RESULT (subprog_decl);
1959 TREE_ADDRESSABLE (TREE_TYPE (result_decl)) = 0;
1960 DECL_BY_REFERENCE (result_decl) = 1;
1964 DECL_DECLARED_INLINE_P (subprog_decl) = 1;
1967 SET_DECL_ASSEMBLER_NAME (subprog_decl, asm_name);
1969 process_attributes (subprog_decl, attr_list);
1971 /* Add this decl to the current binding level. */
1972 gnat_pushdecl (subprog_decl, gnat_node);
1974 /* Output the assembler code and/or RTL for the declaration. */
1975 rest_of_decl_compilation (subprog_decl, global_bindings_p (), 0);
1977 return subprog_decl;
1980 /* Set up the framework for generating code for SUBPROG_DECL, a subprogram
1981 body. This routine needs to be invoked before processing the declarations
1982 appearing in the subprogram. */
1985 begin_subprog_body (tree subprog_decl)
1989 current_function_decl = subprog_decl;
1990 announce_function (subprog_decl);
1992 /* Enter a new binding level and show that all the parameters belong to
1995 for (param_decl = DECL_ARGUMENTS (subprog_decl); param_decl;
1996 param_decl = TREE_CHAIN (param_decl))
1997 DECL_CONTEXT (param_decl) = subprog_decl;
1999 make_decl_rtl (subprog_decl);
2001 /* We handle pending sizes via the elaboration of types, so we don't need to
2002 save them. This causes them to be marked as part of the outer function
2003 and then discarded. */
2004 get_pending_sizes ();
2008 /* Helper for the genericization callback. Return a dereference of VAL
2009 if it is of a reference type. */
2012 convert_from_reference (tree val)
2014 tree value_type, ref;
2016 if (TREE_CODE (TREE_TYPE (val)) != REFERENCE_TYPE)
2019 value_type = TREE_TYPE (TREE_TYPE (val));
2020 ref = build1 (INDIRECT_REF, value_type, val);
2022 /* See if what we reference is CONST or VOLATILE, which requires
2023 looking into array types to get to the component type. */
2025 while (TREE_CODE (value_type) == ARRAY_TYPE)
2026 value_type = TREE_TYPE (value_type);
2029 = (TYPE_QUALS (value_type) & TYPE_QUAL_CONST);
2030 TREE_THIS_VOLATILE (ref)
2031 = (TYPE_QUALS (value_type) & TYPE_QUAL_VOLATILE);
2033 TREE_SIDE_EFFECTS (ref)
2034 = (TREE_THIS_VOLATILE (ref) || TREE_SIDE_EFFECTS (val));
2039 /* Helper for the genericization callback. Returns true if T denotes
2040 a RESULT_DECL with DECL_BY_REFERENCE set. */
2043 is_byref_result (tree t)
2045 return (TREE_CODE (t) == RESULT_DECL && DECL_BY_REFERENCE (t));
2049 /* Tree walking callback for gnat_genericize. Currently ...
2051 o Adjust references to the function's DECL_RESULT if it is marked
2052 DECL_BY_REFERENCE and so has had its type turned into a reference
2053 type at the end of the function compilation. */
2056 gnat_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
2058 /* This implementation is modeled after what the C++ front-end is
2059 doing, basis of the downstream passes behavior. */
2061 tree stmt = *stmt_p;
2062 struct pointer_set_t *p_set = (struct pointer_set_t*) data;
2064 /* If we have a direct mention of the result decl, dereference. */
2065 if (is_byref_result (stmt))
2067 *stmt_p = convert_from_reference (stmt);
2072 /* Otherwise, no need to walk the same tree twice. */
2073 if (pointer_set_contains (p_set, stmt))
2079 /* If we are taking the address of what now is a reference, just get the
2081 if (TREE_CODE (stmt) == ADDR_EXPR
2082 && is_byref_result (TREE_OPERAND (stmt, 0)))
2084 *stmt_p = convert (TREE_TYPE (stmt), TREE_OPERAND (stmt, 0));
2088 /* Don't dereference an by-reference RESULT_DECL inside a RETURN_EXPR. */
2089 else if (TREE_CODE (stmt) == RETURN_EXPR
2090 && TREE_OPERAND (stmt, 0)
2091 && is_byref_result (TREE_OPERAND (stmt, 0)))
2094 /* Don't look inside trees that cannot embed references of interest. */
2095 else if (IS_TYPE_OR_DECL_P (stmt))
2098 pointer_set_insert (p_set, *stmt_p);
2103 /* Perform lowering of Ada trees to GENERIC. In particular:
2105 o Turn a DECL_BY_REFERENCE RESULT_DECL into a real by-reference decl
2106 and adjust all the references to this decl accordingly. */
2109 gnat_genericize (tree fndecl)
2111 /* Prior to GCC 4, an explicit By_Reference result mechanism for a function
2112 was handled by simply setting TREE_ADDRESSABLE on the result type.
2113 Everything required to actually pass by invisible ref using the target
2114 mechanism (e.g. extra parameter) was handled at RTL expansion time.
2116 This doesn't work with GCC 4 any more for several reasons. First, the
2117 gimplification process might need the creation of temporaries of this
2118 type, and the gimplifier ICEs on such attempts. Second, the middle-end
2119 now relies on a different attribute for such cases (DECL_BY_REFERENCE on
2120 RESULT/PARM_DECLs), and expects the user invisible by-reference-ness to
2121 be explicitly accounted for by the front-end in the function body.
2123 We achieve the complete transformation in two steps:
2125 1/ create_subprog_decl performs early attribute tweaks: it clears
2126 TREE_ADDRESSABLE from the result type and sets DECL_BY_REFERENCE on
2127 the result decl. The former ensures that the bit isn't set in the GCC
2128 tree saved for the function, so prevents ICEs on temporary creation.
2129 The latter we use here to trigger the rest of the processing.
2131 2/ This function performs the type transformation on the result decl
2132 and adjusts all the references to this decl from the function body
2135 Clearing TREE_ADDRESSABLE from the type differs from the C++ front-end
2136 strategy, which escapes the gimplifier temporary creation issues by
2137 creating it's own temporaries using TARGET_EXPR nodes. Our way relies
2138 on simple specific support code in aggregate_value_p to look at the
2139 target function result decl explicitly. */
2141 struct pointer_set_t *p_set;
2142 tree decl_result = DECL_RESULT (fndecl);
2144 if (!DECL_BY_REFERENCE (decl_result))
2147 /* Make the DECL_RESULT explicitly by-reference and adjust all the
2148 occurrences in the function body using the common tree-walking facility.
2149 We want to see every occurrence of the result decl to adjust the
2150 referencing tree, so need to use our own pointer set to control which
2151 trees should be visited again or not. */
2153 p_set = pointer_set_create ();
2155 TREE_TYPE (decl_result) = build_reference_type (TREE_TYPE (decl_result));
2156 TREE_ADDRESSABLE (decl_result) = 0;
2157 relayout_decl (decl_result);
2159 walk_tree (&DECL_SAVED_TREE (fndecl), gnat_genericize_r, p_set, NULL);
2161 pointer_set_destroy (p_set);
2164 /* Finish the definition of the current subprogram and compile it all the way
2165 to assembler language output. BODY is the tree corresponding to
2169 end_subprog_body (tree body)
2171 tree fndecl = current_function_decl;
2173 /* Mark the BLOCK for this level as being for this function and pop the
2174 level. Since the vars in it are the parameters, clear them. */
2175 BLOCK_VARS (current_binding_level->block) = 0;
2176 BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl;
2177 DECL_INITIAL (fndecl) = current_binding_level->block;
2180 /* Deal with inline. If declared inline or we should default to inline,
2181 set the flag in the decl. */
2182 DECL_INLINE (fndecl)
2183 = DECL_DECLARED_INLINE_P (fndecl) || flag_inline_trees == 2;
2185 /* We handle pending sizes via the elaboration of types, so we don't
2186 need to save them. */
2187 get_pending_sizes ();
2189 /* Mark the RESULT_DECL as being in this subprogram. */
2190 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
2192 DECL_SAVED_TREE (fndecl) = body;
2194 current_function_decl = DECL_CONTEXT (fndecl);
2197 /* We cannot track the location of errors past this point. */
2198 error_gnat_node = Empty;
2200 /* If we're only annotating types, don't actually compile this function. */
2201 if (type_annotate_only)
2204 /* Perform the required pre-gimplification transformations on the tree. */
2205 gnat_genericize (fndecl);
2207 /* We do different things for nested and non-nested functions.
2208 ??? This should be in cgraph. */
2209 if (!DECL_CONTEXT (fndecl))
2211 gnat_gimplify_function (fndecl);
2212 cgraph_finalize_function (fndecl, false);
2215 /* Register this function with cgraph just far enough to get it
2216 added to our parent's nested function list. */
2217 (void) cgraph_node (fndecl);
2220 /* Convert FNDECL's code to GIMPLE and handle any nested functions. */
2223 gnat_gimplify_function (tree fndecl)
2225 struct cgraph_node *cgn;
2227 dump_function (TDI_original, fndecl);
2228 gimplify_function_tree (fndecl);
2229 dump_function (TDI_generic, fndecl);
2231 /* Convert all nested functions to GIMPLE now. We do things in this order
2232 so that items like VLA sizes are expanded properly in the context of the
2233 correct function. */
2234 cgn = cgraph_node (fndecl);
2235 for (cgn = cgn->nested; cgn; cgn = cgn->next_nested)
2236 gnat_gimplify_function (cgn->decl);
2241 gnat_builtin_function (tree decl)
2243 gnat_pushdecl (decl, Empty);
2247 /* Return an integer type with the number of bits of precision given by
2248 PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise
2249 it is a signed type. */
2252 gnat_type_for_size (unsigned precision, int unsignedp)
2257 if (precision <= 2 * MAX_BITS_PER_WORD
2258 && signed_and_unsigned_types[precision][unsignedp])
2259 return signed_and_unsigned_types[precision][unsignedp];
2262 t = make_unsigned_type (precision);
2264 t = make_signed_type (precision);
2266 if (precision <= 2 * MAX_BITS_PER_WORD)
2267 signed_and_unsigned_types[precision][unsignedp] = t;
2271 sprintf (type_name, "%sSIGNED_%d", unsignedp ? "UN" : "", precision);
2272 TYPE_NAME (t) = get_identifier (type_name);
2278 /* Likewise for floating-point types. */
2281 float_type_for_precision (int precision, enum machine_mode mode)
2286 if (float_types[(int) mode])
2287 return float_types[(int) mode];
2289 float_types[(int) mode] = t = make_node (REAL_TYPE);
2290 TYPE_PRECISION (t) = precision;
2293 gcc_assert (TYPE_MODE (t) == mode);
2296 sprintf (type_name, "FLOAT_%d", precision);
2297 TYPE_NAME (t) = get_identifier (type_name);
2303 /* Return a data type that has machine mode MODE. UNSIGNEDP selects
2304 an unsigned type; otherwise a signed type is returned. */
2307 gnat_type_for_mode (enum machine_mode mode, int unsignedp)
2309 if (mode == BLKmode)
2311 else if (mode == VOIDmode)
2312 return void_type_node;
2313 else if (COMPLEX_MODE_P (mode))
2315 else if (SCALAR_FLOAT_MODE_P (mode))
2316 return float_type_for_precision (GET_MODE_PRECISION (mode), mode);
2317 else if (SCALAR_INT_MODE_P (mode))
2318 return gnat_type_for_size (GET_MODE_BITSIZE (mode), unsignedp);
2323 /* Return the unsigned version of a TYPE_NODE, a scalar type. */
2326 gnat_unsigned_type (tree type_node)
2328 tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 1);
2330 if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node))
2332 type = copy_node (type);
2333 TREE_TYPE (type) = type_node;
2335 else if (TREE_TYPE (type_node)
2336 && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE
2337 && TYPE_MODULAR_P (TREE_TYPE (type_node)))
2339 type = copy_node (type);
2340 TREE_TYPE (type) = TREE_TYPE (type_node);
2346 /* Return the signed version of a TYPE_NODE, a scalar type. */
2349 gnat_signed_type (tree type_node)
2351 tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 0);
2353 if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node))
2355 type = copy_node (type);
2356 TREE_TYPE (type) = type_node;
2358 else if (TREE_TYPE (type_node)
2359 && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE
2360 && TYPE_MODULAR_P (TREE_TYPE (type_node)))
2362 type = copy_node (type);
2363 TREE_TYPE (type) = TREE_TYPE (type_node);
2369 /* Return 1 if the types T1 and T2 are compatible, i.e. if they can be
2370 transparently converted to each other. */
2373 gnat_types_compatible_p (tree t1, tree t2)
2375 enum tree_code code;
2377 /* This is the default criterion. */
2378 if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
2381 /* We only check structural equivalence here. */
2382 if ((code = TREE_CODE (t1)) != TREE_CODE (t2))
2385 /* Array types are also compatible if they are constrained and have
2386 the same component type and the same domain. */
2387 if (code == ARRAY_TYPE
2388 && TREE_TYPE (t1) == TREE_TYPE (t2)
2389 && tree_int_cst_equal (TYPE_MIN_VALUE (TYPE_DOMAIN (t1)),
2390 TYPE_MIN_VALUE (TYPE_DOMAIN (t2)))
2391 && tree_int_cst_equal (TYPE_MAX_VALUE (TYPE_DOMAIN (t1)),
2392 TYPE_MAX_VALUE (TYPE_DOMAIN (t2))))
2395 /* Padding record types are also compatible if they pad the same
2396 type and have the same constant size. */
2397 if (code == RECORD_TYPE
2398 && TYPE_IS_PADDING_P (t1) && TYPE_IS_PADDING_P (t2)
2399 && TREE_TYPE (TYPE_FIELDS (t1)) == TREE_TYPE (TYPE_FIELDS (t2))
2400 && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)))
2406 /* EXP is an expression for the size of an object. If this size contains
2407 discriminant references, replace them with the maximum (if MAX_P) or
2408 minimum (if !MAX_P) possible value of the discriminant. */
2411 max_size (tree exp, bool max_p)
2413 enum tree_code code = TREE_CODE (exp);
2414 tree type = TREE_TYPE (exp);
2416 switch (TREE_CODE_CLASS (code))
2418 case tcc_declaration:
2423 if (code == CALL_EXPR)
2426 int i, n = call_expr_nargs (exp);
2429 argarray = (tree *) alloca (n * sizeof (tree));
2430 for (i = 0; i < n; i++)
2431 argarray[i] = max_size (CALL_EXPR_ARG (exp, i), max_p);
2432 return build_call_array (type, CALL_EXPR_FN (exp), n, argarray);
2437 /* If this contains a PLACEHOLDER_EXPR, it is the thing we want to
2438 modify. Otherwise, we treat it like a variable. */
2439 if (!CONTAINS_PLACEHOLDER_P (exp))
2442 type = TREE_TYPE (TREE_OPERAND (exp, 1));
2444 max_size (max_p ? TYPE_MAX_VALUE (type) : TYPE_MIN_VALUE (type), true);
2446 case tcc_comparison:
2447 return max_p ? size_one_node : size_zero_node;
2451 case tcc_expression:
2452 switch (TREE_CODE_LENGTH (code))
2455 if (code == NON_LVALUE_EXPR)
2456 return max_size (TREE_OPERAND (exp, 0), max_p);
2459 fold_build1 (code, type,
2460 max_size (TREE_OPERAND (exp, 0),
2461 code == NEGATE_EXPR ? !max_p : max_p));
2464 if (code == COMPOUND_EXPR)
2465 return max_size (TREE_OPERAND (exp, 1), max_p);
2467 /* Calculate "(A ? B : C) - D" as "A ? B - D : C - D" which
2468 may provide a tighter bound on max_size. */
2469 if (code == MINUS_EXPR
2470 && TREE_CODE (TREE_OPERAND (exp, 0)) == COND_EXPR)
2472 tree lhs = fold_build2 (MINUS_EXPR, type,
2473 TREE_OPERAND (TREE_OPERAND (exp, 0), 1),
2474 TREE_OPERAND (exp, 1));
2475 tree rhs = fold_build2 (MINUS_EXPR, type,
2476 TREE_OPERAND (TREE_OPERAND (exp, 0), 2),
2477 TREE_OPERAND (exp, 1));
2478 return fold_build2 (max_p ? MAX_EXPR : MIN_EXPR, type,
2479 max_size (lhs, max_p),
2480 max_size (rhs, max_p));
2484 tree lhs = max_size (TREE_OPERAND (exp, 0), max_p);
2485 tree rhs = max_size (TREE_OPERAND (exp, 1),
2486 code == MINUS_EXPR ? !max_p : max_p);
2488 /* Special-case wanting the maximum value of a MIN_EXPR.
2489 In that case, if one side overflows, return the other.
2490 sizetype is signed, but we know sizes are non-negative.
2491 Likewise, handle a MINUS_EXPR or PLUS_EXPR with the LHS
2492 overflowing or the maximum possible value and the RHS
2496 && TREE_CODE (rhs) == INTEGER_CST
2497 && TREE_OVERFLOW (rhs))
2501 && TREE_CODE (lhs) == INTEGER_CST
2502 && TREE_OVERFLOW (lhs))
2504 else if ((code == MINUS_EXPR || code == PLUS_EXPR)
2505 && ((TREE_CODE (lhs) == INTEGER_CST
2506 && TREE_OVERFLOW (lhs))
2507 || operand_equal_p (lhs, TYPE_MAX_VALUE (type), 0))
2508 && !TREE_CONSTANT (rhs))
2511 return fold_build2 (code, type, lhs, rhs);
2515 if (code == SAVE_EXPR)
2517 else if (code == COND_EXPR)
2518 return fold_build2 (max_p ? MAX_EXPR : MIN_EXPR, type,
2519 max_size (TREE_OPERAND (exp, 1), max_p),
2520 max_size (TREE_OPERAND (exp, 2), max_p));
2523 /* Other tree classes cannot happen. */
2531 /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE.
2532 EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs.
2533 Return a constructor for the template. */
2536 build_template (tree template_type, tree array_type, tree expr)
2538 tree template_elts = NULL_TREE;
2539 tree bound_list = NULL_TREE;
2542 while (TREE_CODE (array_type) == RECORD_TYPE
2543 && (TYPE_IS_PADDING_P (array_type)
2544 || TYPE_JUSTIFIED_MODULAR_P (array_type)))
2545 array_type = TREE_TYPE (TYPE_FIELDS (array_type));
2547 if (TREE_CODE (array_type) == ARRAY_TYPE
2548 || (TREE_CODE (array_type) == INTEGER_TYPE
2549 && TYPE_HAS_ACTUAL_BOUNDS_P (array_type)))
2550 bound_list = TYPE_ACTUAL_BOUNDS (array_type);
2552 /* First make the list for a CONSTRUCTOR for the template. Go down the
2553 field list of the template instead of the type chain because this
2554 array might be an Ada array of arrays and we can't tell where the
2555 nested arrays stop being the underlying object. */
2557 for (field = TYPE_FIELDS (template_type); field;
2559 ? (bound_list = TREE_CHAIN (bound_list))
2560 : (array_type = TREE_TYPE (array_type))),
2561 field = TREE_CHAIN (TREE_CHAIN (field)))
2563 tree bounds, min, max;
2565 /* If we have a bound list, get the bounds from there. Likewise
2566 for an ARRAY_TYPE. Otherwise, if expr is a PARM_DECL with
2567 DECL_BY_COMPONENT_PTR_P, use the bounds of the field in the template.
2568 This will give us a maximum range. */
2570 bounds = TREE_VALUE (bound_list);
2571 else if (TREE_CODE (array_type) == ARRAY_TYPE)
2572 bounds = TYPE_INDEX_TYPE (TYPE_DOMAIN (array_type));
2573 else if (expr && TREE_CODE (expr) == PARM_DECL
2574 && DECL_BY_COMPONENT_PTR_P (expr))
2575 bounds = TREE_TYPE (field);
2579 min = convert (TREE_TYPE (field), TYPE_MIN_VALUE (bounds));
2580 max = convert (TREE_TYPE (TREE_CHAIN (field)), TYPE_MAX_VALUE (bounds));
2582 /* If either MIN or MAX involve a PLACEHOLDER_EXPR, we must
2583 substitute it from OBJECT. */
2584 min = SUBSTITUTE_PLACEHOLDER_IN_EXPR (min, expr);
2585 max = SUBSTITUTE_PLACEHOLDER_IN_EXPR (max, expr);
2587 template_elts = tree_cons (TREE_CHAIN (field), max,
2588 tree_cons (field, min, template_elts));
2591 return gnat_build_constructor (template_type, nreverse (template_elts));
2594 /* Build a VMS descriptor from a Mechanism_Type, which must specify
2595 a descriptor type, and the GCC type of an object. Each FIELD_DECL
2596 in the type contains in its DECL_INITIAL the expression to use when
2597 a constructor is made for the type. GNAT_ENTITY is an entity used
2598 to print out an error message if the mechanism cannot be applied to
2599 an object of that type and also for the name. */
2602 build_vms_descriptor (tree type, Mechanism_Type mech, Entity_Id gnat_entity)
2604 tree record_type = make_node (RECORD_TYPE);
2605 tree pointer32_type;
2606 tree field_list = 0;
2615 /* If TYPE is an unconstrained array, use the underlying array type. */
2616 if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
2617 type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type))));
2619 /* If this is an array, compute the number of dimensions in the array,
2620 get the index types, and point to the inner type. */
2621 if (TREE_CODE (type) != ARRAY_TYPE)
2624 for (ndim = 1, inner_type = type;
2625 TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE
2626 && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type));
2627 ndim++, inner_type = TREE_TYPE (inner_type))
2630 idx_arr = (tree *) alloca (ndim * sizeof (tree));
2632 if (mech != By_Descriptor_NCA
2633 && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type))
2634 for (i = ndim - 1, inner_type = type;
2636 i--, inner_type = TREE_TYPE (inner_type))
2637 idx_arr[i] = TYPE_DOMAIN (inner_type);
2639 for (i = 0, inner_type = type;
2641 i++, inner_type = TREE_TYPE (inner_type))
2642 idx_arr[i] = TYPE_DOMAIN (inner_type);
2644 /* Now get the DTYPE value. */
2645 switch (TREE_CODE (type))
2649 if (TYPE_VAX_FLOATING_POINT_P (type))
2650 switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1))
2663 switch (GET_MODE_BITSIZE (TYPE_MODE (type)))
2666 dtype = TYPE_UNSIGNED (type) ? 2 : 6;
2669 dtype = TYPE_UNSIGNED (type) ? 3 : 7;
2672 dtype = TYPE_UNSIGNED (type) ? 4 : 8;
2675 dtype = TYPE_UNSIGNED (type) ? 5 : 9;
2678 dtype = TYPE_UNSIGNED (type) ? 25 : 26;
2684 dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53;
2688 if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE
2689 && TYPE_VAX_FLOATING_POINT_P (type))
2690 switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1))
2702 dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55;
2713 /* Get the CLASS value. */
2716 case By_Descriptor_A:
2719 case By_Descriptor_NCA:
2722 case By_Descriptor_SB:
2726 case By_Descriptor_S:
2732 /* Make the type for a descriptor for VMS. The first four fields
2733 are the same for all types. */
2736 = chainon (field_list,
2737 make_descriptor_field
2738 ("LENGTH", gnat_type_for_size (16, 1), record_type,
2739 size_in_bytes (mech == By_Descriptor_A ? inner_type : type)));
2741 field_list = chainon (field_list,
2742 make_descriptor_field ("DTYPE",
2743 gnat_type_for_size (8, 1),
2744 record_type, size_int (dtype)));
2745 field_list = chainon (field_list,
2746 make_descriptor_field ("CLASS",
2747 gnat_type_for_size (8, 1),
2748 record_type, size_int (class)));
2750 /* Of course this will crash at run-time if the address space is not
2751 within the low 32 bits, but there is nothing else we can do. */
2752 pointer32_type = build_pointer_type_for_mode (type, SImode, false);
2755 = chainon (field_list,
2756 make_descriptor_field
2757 ("POINTER", pointer32_type, record_type,
2758 build_unary_op (ADDR_EXPR,
2760 build0 (PLACEHOLDER_EXPR, type))));
2765 case By_Descriptor_S:
2768 case By_Descriptor_SB:
2770 = chainon (field_list,
2771 make_descriptor_field
2772 ("SB_L1", gnat_type_for_size (32, 1), record_type,
2773 TREE_CODE (type) == ARRAY_TYPE
2774 ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) : size_zero_node));
2776 = chainon (field_list,
2777 make_descriptor_field
2778 ("SB_U1", gnat_type_for_size (32, 1), record_type,
2779 TREE_CODE (type) == ARRAY_TYPE
2780 ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) : size_zero_node));
2783 case By_Descriptor_A:
2784 case By_Descriptor_NCA:
2785 field_list = chainon (field_list,
2786 make_descriptor_field ("SCALE",
2787 gnat_type_for_size (8, 1),
2791 field_list = chainon (field_list,
2792 make_descriptor_field ("DIGITS",
2793 gnat_type_for_size (8, 1),
2798 = chainon (field_list,
2799 make_descriptor_field
2800 ("AFLAGS", gnat_type_for_size (8, 1), record_type,
2801 size_int (mech == By_Descriptor_NCA
2803 /* Set FL_COLUMN, FL_COEFF, and FL_BOUNDS. */
2804 : (TREE_CODE (type) == ARRAY_TYPE
2805 && TYPE_CONVENTION_FORTRAN_P (type)
2808 field_list = chainon (field_list,
2809 make_descriptor_field ("DIMCT",
2810 gnat_type_for_size (8, 1),
2814 field_list = chainon (field_list,
2815 make_descriptor_field ("ARSIZE",
2816 gnat_type_for_size (32, 1),
2818 size_in_bytes (type)));
2820 /* Now build a pointer to the 0,0,0... element. */
2821 tem = build0 (PLACEHOLDER_EXPR, type);
2822 for (i = 0, inner_type = type; i < ndim;
2823 i++, inner_type = TREE_TYPE (inner_type))
2824 tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem,
2825 convert (TYPE_DOMAIN (inner_type), size_zero_node),
2826 NULL_TREE, NULL_TREE);
2829 = chainon (field_list,
2830 make_descriptor_field
2832 build_pointer_type_for_mode (inner_type, SImode, false),
2835 build_pointer_type_for_mode (inner_type, SImode,
2839 /* Next come the addressing coefficients. */
2840 tem = size_one_node;
2841 for (i = 0; i < ndim; i++)
2845 = size_binop (MULT_EXPR, tem,
2846 size_binop (PLUS_EXPR,
2847 size_binop (MINUS_EXPR,
2848 TYPE_MAX_VALUE (idx_arr[i]),
2849 TYPE_MIN_VALUE (idx_arr[i])),
2852 fname[0] = (mech == By_Descriptor_NCA ? 'S' : 'M');
2853 fname[1] = '0' + i, fname[2] = 0;
2855 = chainon (field_list,
2856 make_descriptor_field (fname,
2857 gnat_type_for_size (32, 1),
2858 record_type, idx_length));
2860 if (mech == By_Descriptor_NCA)
2864 /* Finally here are the bounds. */
2865 for (i = 0; i < ndim; i++)
2869 fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0;
2871 = chainon (field_list,
2872 make_descriptor_field
2873 (fname, gnat_type_for_size (32, 1), record_type,
2874 TYPE_MIN_VALUE (idx_arr[i])));
2878 = chainon (field_list,
2879 make_descriptor_field
2880 (fname, gnat_type_for_size (32, 1), record_type,
2881 TYPE_MAX_VALUE (idx_arr[i])));
2886 post_error ("unsupported descriptor type for &", gnat_entity);
2889 finish_record_type (record_type, field_list, 0, true);
2890 create_type_decl (create_concat_name (gnat_entity, "DESC"), record_type,
2891 NULL, true, false, gnat_entity);
2896 /* Utility routine for above code to make a field. */
2899 make_descriptor_field (const char *name, tree type,
2900 tree rec_type, tree initial)
2903 = create_field_decl (get_identifier (name), type, rec_type, 0, 0, 0, 0);
2905 DECL_INITIAL (field) = initial;
2909 /* Convert GNU_EXPR, a pointer to a VMS descriptor, to GNU_TYPE, a regular
2910 pointer or fat pointer type. GNAT_SUBPROG is the subprogram to which
2911 the VMS descriptor is passed. */
2914 convert_vms_descriptor (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog)
2916 tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr));
2917 tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr);
2918 /* The CLASS field is the 3rd field in the descriptor. */
2919 tree class = TREE_CHAIN (TREE_CHAIN (TYPE_FIELDS (desc_type)));
2920 /* The POINTER field is the 4th field in the descriptor. */
2921 tree pointer = TREE_CHAIN (class);
2923 /* Retrieve the value of the POINTER field. */
2925 = build3 (COMPONENT_REF, TREE_TYPE (pointer), desc, pointer, NULL_TREE);
2927 if (POINTER_TYPE_P (gnu_type))
2928 return convert (gnu_type, gnu_expr);
2930 else if (TYPE_FAT_POINTER_P (gnu_type))
2932 tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
2933 tree p_bounds_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)));
2934 tree template_type = TREE_TYPE (p_bounds_type);
2935 tree min_field = TYPE_FIELDS (template_type);
2936 tree max_field = TREE_CHAIN (TYPE_FIELDS (template_type));
2937 tree template, template_addr, aflags, dimct, t, u;
2938 /* See the head comment of build_vms_descriptor. */
2939 int iclass = TREE_INT_CST_LOW (DECL_INITIAL (class));
2941 /* Convert POINTER to the type of the P_ARRAY field. */
2942 gnu_expr = convert (p_array_type, gnu_expr);
2946 case 1: /* Class S */
2947 case 15: /* Class SB */
2948 /* Build {1, LENGTH} template; LENGTH is the 1st field. */
2949 t = TYPE_FIELDS (desc_type);
2950 t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
2951 t = tree_cons (min_field,
2952 convert (TREE_TYPE (min_field), integer_one_node),
2953 tree_cons (max_field,
2954 convert (TREE_TYPE (max_field), t),
2956 template = gnat_build_constructor (template_type, t);
2957 template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template);
2959 /* For class S, we are done. */
2963 /* Test that we really have a SB descriptor, like DEC Ada. */
2964 t = build3 (COMPONENT_REF, TREE_TYPE (class), desc, class, NULL);
2965 u = convert (TREE_TYPE (class), DECL_INITIAL (class));
2966 u = build_binary_op (EQ_EXPR, integer_type_node, t, u);
2967 /* If so, there is already a template in the descriptor and
2968 it is located right after the POINTER field. */
2969 t = TREE_CHAIN (pointer);
2970 template = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
2971 /* Otherwise use the {1, LENGTH} template we build above. */
2972 template_addr = build3 (COND_EXPR, p_bounds_type, u,
2973 build_unary_op (ADDR_EXPR, p_bounds_type,
2978 case 4: /* Class A */
2979 /* The AFLAGS field is the 7th field in the descriptor. */
2980 t = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (pointer)));
2981 aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
2982 /* The DIMCT field is the 8th field in the descriptor. */
2984 dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
2985 /* Raise CONSTRAINT_ERROR if either more than 1 dimension
2986 or FL_COEFF or FL_BOUNDS not set. */
2987 u = build_int_cst (TREE_TYPE (aflags), 192);
2988 u = build_binary_op (TRUTH_OR_EXPR, integer_type_node,
2989 build_binary_op (NE_EXPR, integer_type_node,
2991 convert (TREE_TYPE (dimct),
2993 build_binary_op (NE_EXPR, integer_type_node,
2994 build2 (BIT_AND_EXPR,
2998 add_stmt (build3 (COND_EXPR, void_type_node, u,
2999 build_call_raise (CE_Length_Check_Failed, Empty,
3000 N_Raise_Constraint_Error),
3002 /* There is already a template in the descriptor and it is
3003 located at the start of block 3 (12th field). */
3004 t = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (t))));
3005 template = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3006 template_addr = build_unary_op (ADDR_EXPR, p_bounds_type, template);
3009 case 10: /* Class NCA */
3011 post_error ("unsupported descriptor type for &", gnat_subprog);
3012 template_addr = integer_zero_node;
3016 /* Build the fat pointer in the form of a constructor. */
3017 t = tree_cons (TYPE_FIELDS (gnu_type), gnu_expr,
3018 tree_cons (TREE_CHAIN (TYPE_FIELDS (gnu_type)),
3019 template_addr, NULL_TREE));
3020 return gnat_build_constructor (gnu_type, t);
3027 /* Build a stub for the subprogram specified by the GCC tree GNU_SUBPROG
3028 and the GNAT node GNAT_SUBPROG. */
3031 build_function_stub (tree gnu_subprog, Entity_Id gnat_subprog)
3033 tree gnu_subprog_type, gnu_subprog_addr, gnu_subprog_call;
3034 tree gnu_stub_param, gnu_param_list, gnu_arg_types, gnu_param;
3035 tree gnu_stub_decl = DECL_FUNCTION_STUB (gnu_subprog);
3038 gnu_subprog_type = TREE_TYPE (gnu_subprog);
3039 gnu_param_list = NULL_TREE;
3041 begin_subprog_body (gnu_stub_decl);
3044 start_stmt_group ();
3046 /* Loop over the parameters of the stub and translate any of them
3047 passed by descriptor into a by reference one. */
3048 for (gnu_stub_param = DECL_ARGUMENTS (gnu_stub_decl),
3049 gnu_arg_types = TYPE_ARG_TYPES (gnu_subprog_type);
3051 gnu_stub_param = TREE_CHAIN (gnu_stub_param),
3052 gnu_arg_types = TREE_CHAIN (gnu_arg_types))
3054 if (DECL_BY_DESCRIPTOR_P (gnu_stub_param))
3055 gnu_param = convert_vms_descriptor (TREE_VALUE (gnu_arg_types),
3056 gnu_stub_param, gnat_subprog);
3058 gnu_param = gnu_stub_param;
3060 gnu_param_list = tree_cons (NULL_TREE, gnu_param, gnu_param_list);
3063 gnu_body = end_stmt_group ();
3065 /* Invoke the internal subprogram. */
3066 gnu_subprog_addr = build1 (ADDR_EXPR, build_pointer_type (gnu_subprog_type),
3068 gnu_subprog_call = build_call_list (TREE_TYPE (gnu_subprog_type),
3070 nreverse (gnu_param_list));
3072 /* Propagate the return value, if any. */
3073 if (VOID_TYPE_P (TREE_TYPE (gnu_subprog_type)))
3074 append_to_statement_list (gnu_subprog_call, &gnu_body);
3076 append_to_statement_list (build_return_expr (DECL_RESULT (gnu_stub_decl),
3082 allocate_struct_function (gnu_stub_decl, false);
3083 end_subprog_body (gnu_body);
3086 /* Build a type to be used to represent an aliased object whose nominal
3087 type is an unconstrained array. This consists of a RECORD_TYPE containing
3088 a field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an
3089 ARRAY_TYPE. If ARRAY_TYPE is that of the unconstrained array, this
3090 is used to represent an arbitrary unconstrained object. Use NAME
3091 as the name of the record. */
3094 build_unc_object_type (tree template_type, tree object_type, tree name)
3096 tree type = make_node (RECORD_TYPE);
3097 tree template_field = create_field_decl (get_identifier ("BOUNDS"),
3098 template_type, type, 0, 0, 0, 1);
3099 tree array_field = create_field_decl (get_identifier ("ARRAY"), object_type,
3102 TYPE_NAME (type) = name;
3103 TYPE_CONTAINS_TEMPLATE_P (type) = 1;
3104 finish_record_type (type,
3105 chainon (chainon (NULL_TREE, template_field),
3112 /* Same, taking a thin or fat pointer type instead of a template type. */
3115 build_unc_object_type_from_ptr (tree thin_fat_ptr_type, tree object_type,
3120 gcc_assert (TYPE_FAT_OR_THIN_POINTER_P (thin_fat_ptr_type));
3123 = (TYPE_FAT_POINTER_P (thin_fat_ptr_type)
3124 ? TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (thin_fat_ptr_type))))
3125 : TREE_TYPE (TYPE_FIELDS (TREE_TYPE (thin_fat_ptr_type))));
3126 return build_unc_object_type (template_type, object_type, name);
3129 /* Shift the component offsets within an unconstrained object TYPE to make it
3130 suitable for use as a designated type for thin pointers. */
3133 shift_unc_components_for_thin_pointers (tree type)
3135 /* Thin pointer values designate the ARRAY data of an unconstrained object,
3136 allocated past the BOUNDS template. The designated type is adjusted to
3137 have ARRAY at position zero and the template at a negative offset, so
3138 that COMPONENT_REFs on (*thin_ptr) designate the proper location. */
3140 tree bounds_field = TYPE_FIELDS (type);
3141 tree array_field = TREE_CHAIN (TYPE_FIELDS (type));
3143 DECL_FIELD_OFFSET (bounds_field)
3144 = size_binop (MINUS_EXPR, size_zero_node, byte_position (array_field));
3146 DECL_FIELD_OFFSET (array_field) = size_zero_node;
3147 DECL_FIELD_BIT_OFFSET (array_field) = bitsize_zero_node;
3150 /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE. In
3151 the normal case this is just two adjustments, but we have more to do
3152 if NEW is an UNCONSTRAINED_ARRAY_TYPE. */
3155 update_pointer_to (tree old_type, tree new_type)
3157 tree ptr = TYPE_POINTER_TO (old_type);
3158 tree ref = TYPE_REFERENCE_TO (old_type);
3162 /* If this is the main variant, process all the other variants first. */
3163 if (TYPE_MAIN_VARIANT (old_type) == old_type)
3164 for (type = TYPE_NEXT_VARIANT (old_type); type;
3165 type = TYPE_NEXT_VARIANT (type))
3166 update_pointer_to (type, new_type);
3168 /* If no pointer or reference, we are done. */
3172 /* Merge the old type qualifiers in the new type.
3174 Each old variant has qualifiers for specific reasons, and the new
3175 designated type as well. Each set of qualifiers represents useful
3176 information grabbed at some point, and merging the two simply unifies
3177 these inputs into the final type description.
3179 Consider for instance a volatile type frozen after an access to constant
3180 type designating it. After the designated type freeze, we get here with a
3181 volatile new_type and a dummy old_type with a readonly variant, created
3182 when the access type was processed. We shall make a volatile and readonly
3183 designated type, because that's what it really is.
3185 We might also get here for a non-dummy old_type variant with different
3186 qualifiers than the new_type ones, for instance in some cases of pointers
3187 to private record type elaboration (see the comments around the call to
3188 this routine from gnat_to_gnu_entity/E_Access_Type). We have to merge the
3189 qualifiers in those cases too, to avoid accidentally discarding the
3190 initial set, and will often end up with old_type == new_type then. */
3191 new_type = build_qualified_type (new_type,
3192 TYPE_QUALS (old_type)
3193 | TYPE_QUALS (new_type));
3195 /* If the new type and the old one are identical, there is nothing to
3197 if (old_type == new_type)
3200 /* Otherwise, first handle the simple case. */
3201 if (TREE_CODE (new_type) != UNCONSTRAINED_ARRAY_TYPE)
3203 TYPE_POINTER_TO (new_type) = ptr;
3204 TYPE_REFERENCE_TO (new_type) = ref;
3206 for (; ptr; ptr = TYPE_NEXT_PTR_TO (ptr))
3207 for (ptr1 = TYPE_MAIN_VARIANT (ptr); ptr1;
3208 ptr1 = TYPE_NEXT_VARIANT (ptr1))
3209 TREE_TYPE (ptr1) = new_type;
3211 for (; ref; ref = TYPE_NEXT_REF_TO (ref))
3212 for (ref1 = TYPE_MAIN_VARIANT (ref); ref1;
3213 ref1 = TYPE_NEXT_VARIANT (ref1))
3214 TREE_TYPE (ref1) = new_type;
3217 /* Now deal with the unconstrained array case. In this case the "pointer"
3218 is actually a RECORD_TYPE where both fields are pointers to dummy nodes.
3219 Turn them into pointers to the correct types using update_pointer_to. */
3220 else if (TREE_CODE (ptr) != RECORD_TYPE || !TYPE_IS_FAT_POINTER_P (ptr))
3225 tree new_obj_rec = TYPE_OBJECT_RECORD_TYPE (new_type);
3226 tree array_field = TYPE_FIELDS (ptr);
3227 tree bounds_field = TREE_CHAIN (TYPE_FIELDS (ptr));
3228 tree new_ptr = TYPE_POINTER_TO (new_type);
3232 /* Make pointers to the dummy template point to the real template. */
3234 (TREE_TYPE (TREE_TYPE (bounds_field)),
3235 TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (new_ptr)))));
3237 /* The references to the template bounds present in the array type
3238 are made through a PLACEHOLDER_EXPR of type new_ptr. Since we
3239 are updating ptr to make it a full replacement for new_ptr as
3240 pointer to new_type, we must rework the PLACEHOLDER_EXPR so as
3241 to make it of type ptr. */
3242 new_ref = build3 (COMPONENT_REF, TREE_TYPE (bounds_field),
3243 build0 (PLACEHOLDER_EXPR, ptr),
3244 bounds_field, NULL_TREE);
3246 /* Create the new array for the new PLACEHOLDER_EXPR and make
3247 pointers to the dummy array point to it.
3249 ??? This is now the only use of substitute_in_type,
3250 which is a very "heavy" routine to do this, so it
3251 should be replaced at some point. */
3253 (TREE_TYPE (TREE_TYPE (array_field)),
3254 substitute_in_type (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (new_ptr))),
3255 TREE_CHAIN (TYPE_FIELDS (new_ptr)), new_ref));
3257 /* Make ptr the pointer to new_type. */
3258 TYPE_POINTER_TO (new_type) = TYPE_REFERENCE_TO (new_type)
3259 = TREE_TYPE (new_type) = ptr;
3261 for (var = TYPE_MAIN_VARIANT (ptr); var; var = TYPE_NEXT_VARIANT (var))
3262 SET_TYPE_UNCONSTRAINED_ARRAY (var, new_type);
3264 /* Now handle updating the allocation record, what the thin pointer
3265 points to. Update all pointers from the old record into the new
3266 one, update the type of the array field, and recompute the size. */
3267 update_pointer_to (TYPE_OBJECT_RECORD_TYPE (old_type), new_obj_rec);
3269 TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (new_obj_rec)))
3270 = TREE_TYPE (TREE_TYPE (array_field));
3272 /* The size recomputation needs to account for alignment constraints, so
3273 we let layout_type work it out. This will reset the field offsets to
3274 what they would be in a regular record, so we shift them back to what
3275 we want them to be for a thin pointer designated type afterwards. */
3276 DECL_SIZE (TYPE_FIELDS (new_obj_rec)) = 0;
3277 DECL_SIZE (TREE_CHAIN (TYPE_FIELDS (new_obj_rec))) = 0;
3278 TYPE_SIZE (new_obj_rec) = 0;
3279 layout_type (new_obj_rec);
3281 shift_unc_components_for_thin_pointers (new_obj_rec);
3283 /* We are done, at last. */
3284 rest_of_record_type_compilation (ptr);
3288 /* Convert a pointer to a constrained array into a pointer to a fat
3289 pointer. This involves making or finding a template. */
3292 convert_to_fat_pointer (tree type, tree expr)
3294 tree template_type = TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (type))));
3295 tree template, template_addr;
3296 tree etype = TREE_TYPE (expr);
3298 /* If EXPR is a constant of zero, we make a fat pointer that has a null
3299 pointer to the template and array. */
3300 if (integer_zerop (expr))
3302 gnat_build_constructor
3304 tree_cons (TYPE_FIELDS (type),
3305 convert (TREE_TYPE (TYPE_FIELDS (type)), expr),
3306 tree_cons (TREE_CHAIN (TYPE_FIELDS (type)),
3307 convert (build_pointer_type (template_type),
3311 /* If EXPR is a thin pointer, make the template and data from the record. */
3313 else if (TYPE_THIN_POINTER_P (etype))
3315 tree fields = TYPE_FIELDS (TREE_TYPE (etype));
3317 expr = save_expr (expr);
3318 if (TREE_CODE (expr) == ADDR_EXPR)
3319 expr = TREE_OPERAND (expr, 0);
3321 expr = build1 (INDIRECT_REF, TREE_TYPE (etype), expr);
3323 template = build_component_ref (expr, NULL_TREE, fields, false);
3324 expr = build_unary_op (ADDR_EXPR, NULL_TREE,
3325 build_component_ref (expr, NULL_TREE,
3326 TREE_CHAIN (fields), false));
3329 /* Otherwise, build the constructor for the template. */
3330 template = build_template (template_type, TREE_TYPE (etype), expr);
3332 template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template);
3334 /* The result is a CONSTRUCTOR for the fat pointer.
3336 If expr is an argument of a foreign convention subprogram, the type it
3337 points to is directly the component type. In this case, the expression
3338 type may not match the corresponding FIELD_DECL type at this point, so we
3339 call "convert" here to fix that up if necessary. This type consistency is
3340 required, for instance because it ensures that possible later folding of
3341 component_refs against this constructor always yields something of the
3342 same type as the initial reference.
3344 Note that the call to "build_template" above is still fine, because it
3345 will only refer to the provided template_type in this case. */
3347 gnat_build_constructor
3348 (type, tree_cons (TYPE_FIELDS (type),
3349 convert (TREE_TYPE (TYPE_FIELDS (type)), expr),
3350 tree_cons (TREE_CHAIN (TYPE_FIELDS (type)),
3351 template_addr, NULL_TREE)));
3354 /* Convert to a thin pointer type, TYPE. The only thing we know how to convert
3355 is something that is a fat pointer, so convert to it first if it EXPR
3356 is not already a fat pointer. */
3359 convert_to_thin_pointer (tree type, tree expr)
3361 if (!TYPE_FAT_POINTER_P (TREE_TYPE (expr)))
3363 = convert_to_fat_pointer
3364 (TREE_TYPE (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))), expr);
3366 /* We get the pointer to the data and use a NOP_EXPR to make it the
3368 expr = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (TREE_TYPE (expr)),
3370 expr = build1 (NOP_EXPR, type, expr);
3375 /* Create an expression whose value is that of EXPR,
3376 converted to type TYPE. The TREE_TYPE of the value
3377 is always TYPE. This function implements all reasonable
3378 conversions; callers should filter out those that are
3379 not permitted by the language being compiled. */
3382 convert (tree type, tree expr)
3384 enum tree_code code = TREE_CODE (type);
3385 tree etype = TREE_TYPE (expr);
3386 enum tree_code ecode = TREE_CODE (etype);
3388 /* If EXPR is already the right type, we are done. */
3392 /* If both input and output have padding and are of variable size, do this
3393 as an unchecked conversion. Likewise if one is a mere variant of the
3394 other, so we avoid a pointless unpad/repad sequence. */
3395 else if (code == RECORD_TYPE && ecode == RECORD_TYPE
3396 && TYPE_IS_PADDING_P (type) && TYPE_IS_PADDING_P (etype)
3397 && (!TREE_CONSTANT (TYPE_SIZE (type))
3398 || !TREE_CONSTANT (TYPE_SIZE (etype))
3399 || gnat_types_compatible_p (type, etype)
3400 || TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type)))
3401 == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (etype)))))
3404 /* If the output type has padding, convert to the inner type and
3405 make a constructor to build the record. */
3406 else if (code == RECORD_TYPE && TYPE_IS_PADDING_P (type))
3408 /* If we previously converted from another type and our type is
3409 of variable size, remove the conversion to avoid the need for
3410 variable-size temporaries. Likewise for a conversion between
3411 original and packable version. */
3412 if (TREE_CODE (expr) == VIEW_CONVERT_EXPR
3413 && (!TREE_CONSTANT (TYPE_SIZE (type))
3414 || (ecode == RECORD_TYPE
3415 && TYPE_NAME (etype)
3416 == TYPE_NAME (TREE_TYPE (TREE_OPERAND (expr, 0))))))
3417 expr = TREE_OPERAND (expr, 0);
3419 /* If we are just removing the padding from expr, convert the original
3420 object if we have variable size in order to avoid the need for some
3421 variable-size temporaries. Likewise if the padding is a mere variant
3422 of the other, so we avoid a pointless unpad/repad sequence. */
3423 if (TREE_CODE (expr) == COMPONENT_REF
3424 && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == RECORD_TYPE
3425 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (expr, 0)))
3426 && (!TREE_CONSTANT (TYPE_SIZE (type))
3427 || gnat_types_compatible_p (type,
3428 TREE_TYPE (TREE_OPERAND (expr, 0)))
3429 || (ecode == RECORD_TYPE
3430 && TYPE_NAME (etype)
3431 == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type))))))
3432 return convert (type, TREE_OPERAND (expr, 0));
3434 /* If the result type is a padded type with a self-referentially-sized
3435 field and the expression type is a record, do this as an
3436 unchecked conversion. */
3437 else if (TREE_CODE (etype) == RECORD_TYPE
3438 && CONTAINS_PLACEHOLDER_P (DECL_SIZE (TYPE_FIELDS (type))))
3439 return unchecked_convert (type, expr, false);
3443 gnat_build_constructor (type,
3444 tree_cons (TYPE_FIELDS (type),
3446 (TYPE_FIELDS (type)),
3451 /* If the input type has padding, remove it and convert to the output type.
3452 The conditions ordering is arranged to ensure that the output type is not
3453 a padding type here, as it is not clear whether the conversion would
3454 always be correct if this was to happen. */
3455 else if (ecode == RECORD_TYPE && TYPE_IS_PADDING_P (etype))
3459 /* If we have just converted to this padded type, just get the
3460 inner expression. */
3461 if (TREE_CODE (expr) == CONSTRUCTOR
3462 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (expr))
3463 && VEC_index (constructor_elt, CONSTRUCTOR_ELTS (expr), 0)->index
3464 == TYPE_FIELDS (etype))
3466 = VEC_index (constructor_elt, CONSTRUCTOR_ELTS (expr), 0)->value;
3468 /* Otherwise, build an explicit component reference. */
3471 = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (etype), false);
3473 return convert (type, unpadded);
3476 /* If the input is a biased type, adjust first. */
3477 if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype))
3478 return convert (type, fold_build2 (PLUS_EXPR, TREE_TYPE (etype),
3479 fold_convert (TREE_TYPE (etype),
3481 TYPE_MIN_VALUE (etype)));
3483 /* If the input is a justified modular type, we need to extract the actual
3484 object before converting it to any other type with the exceptions of an
3485 unconstrained array or of a mere type variant. It is useful to avoid the
3486 extraction and conversion in the type variant case because it could end
3487 up replacing a VAR_DECL expr by a constructor and we might be about the
3488 take the address of the result. */
3489 if (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype)
3490 && code != UNCONSTRAINED_ARRAY_TYPE
3491 && TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (etype))
3492 return convert (type, build_component_ref (expr, NULL_TREE,
3493 TYPE_FIELDS (etype), false));
3495 /* If converting to a type that contains a template, convert to the data
3496 type and then build the template. */
3497 if (code == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (type))
3499 tree obj_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (type)));
3501 /* If the source already has a template, get a reference to the
3502 associated array only, as we are going to rebuild a template
3503 for the target type anyway. */
3504 expr = maybe_unconstrained_array (expr);
3507 gnat_build_constructor
3509 tree_cons (TYPE_FIELDS (type),
3510 build_template (TREE_TYPE (TYPE_FIELDS (type)),
3511 obj_type, NULL_TREE),
3512 tree_cons (TREE_CHAIN (TYPE_FIELDS (type)),
3513 convert (obj_type, expr), NULL_TREE)));
3516 /* There are some special cases of expressions that we process
3518 switch (TREE_CODE (expr))
3524 /* Just set its type here. For TRANSFORM_EXPR, we will do the actual
3525 conversion in gnat_expand_expr. NULL_EXPR does not represent
3526 and actual value, so no conversion is needed. */
3527 expr = copy_node (expr);
3528 TREE_TYPE (expr) = type;
3532 /* If we are converting a STRING_CST to another constrained array type,
3533 just make a new one in the proper type. */
3534 if (code == ecode && AGGREGATE_TYPE_P (etype)
3535 && !(TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST
3536 && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST))
3538 expr = copy_node (expr);
3539 TREE_TYPE (expr) = type;
3545 /* If we are converting a CONSTRUCTOR to a mere variant type, just make
3546 a new one in the proper type. Likewise for a conversion between
3547 original and packable version. */
3549 && (gnat_types_compatible_p (type, etype)
3550 || (code == RECORD_TYPE
3551 && TYPE_NAME (type) == TYPE_NAME (etype))))
3553 expr = copy_node (expr);
3554 TREE_TYPE (expr) = type;
3559 case UNCONSTRAINED_ARRAY_REF:
3560 /* Convert this to the type of the inner array by getting the address of
3561 the array from the template. */
3562 expr = build_unary_op (INDIRECT_REF, NULL_TREE,
3563 build_component_ref (TREE_OPERAND (expr, 0),
3564 get_identifier ("P_ARRAY"),
3566 etype = TREE_TYPE (expr);
3567 ecode = TREE_CODE (etype);
3570 case VIEW_CONVERT_EXPR:
3572 /* GCC 4.x is very sensitive to type consistency overall, and view
3573 conversions thus are very frequent. Even though just "convert"ing
3574 the inner operand to the output type is fine in most cases, it
3575 might expose unexpected input/output type mismatches in special
3576 circumstances so we avoid such recursive calls when we can. */
3577 tree op0 = TREE_OPERAND (expr, 0);
3579 /* If we are converting back to the original type, we can just
3580 lift the input conversion. This is a common occurrence with
3581 switches back-and-forth amongst type variants. */
3582 if (type == TREE_TYPE (op0))
3585 /* Otherwise, if we're converting between two aggregate types, we
3586 might be allowed to substitute the VIEW_CONVERT_EXPR target type
3587 in place or to just convert the inner expression. */
3588 if (AGGREGATE_TYPE_P (type) && AGGREGATE_TYPE_P (etype))
3590 /* If we are converting between mere variants, we can just
3591 substitute the VIEW_CONVERT_EXPR in place. */
3592 if (gnat_types_compatible_p (type, etype))
3593 return build1 (VIEW_CONVERT_EXPR, type, op0);
3595 /* Otherwise, we may just bypass the input view conversion unless
3596 one of the types is a fat pointer, which is handled by
3597 specialized code below which relies on exact type matching. */
3598 else if (!TYPE_FAT_POINTER_P (type) && !TYPE_FAT_POINTER_P (etype))
3599 return convert (type, op0);
3605 /* If both types are record types, just convert the pointer and
3606 make a new INDIRECT_REF.
3608 ??? Disable this for now since it causes problems with the
3609 code in build_binary_op for MODIFY_EXPR which wants to
3610 strip off conversions. But that code really is a mess and
3611 we need to do this a much better way some time. */
3613 && (TREE_CODE (type) == RECORD_TYPE
3614 || TREE_CODE (type) == UNION_TYPE)
3615 && (TREE_CODE (etype) == RECORD_TYPE
3616 || TREE_CODE (etype) == UNION_TYPE)
3617 && !TYPE_FAT_POINTER_P (type) && !TYPE_FAT_POINTER_P (etype))
3618 return build_unary_op (INDIRECT_REF, NULL_TREE,
3619 convert (build_pointer_type (type),
3620 TREE_OPERAND (expr, 0)));
3627 /* Check for converting to a pointer to an unconstrained array. */
3628 if (TYPE_FAT_POINTER_P (type) && !TYPE_FAT_POINTER_P (etype))
3629 return convert_to_fat_pointer (type, expr);
3631 /* If we're converting between two aggregate types that are mere
3632 variants, just make a VIEW_CONVERT_EXPR. */
3633 else if (code == ecode
3634 && AGGREGATE_TYPE_P (type)
3635 && gnat_types_compatible_p (type, etype))
3636 return build1 (VIEW_CONVERT_EXPR, type, expr);
3638 /* In all other cases of related types, make a NOP_EXPR. */
3639 else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (etype)
3640 || (code == INTEGER_CST && ecode == INTEGER_CST
3641 && (type == TREE_TYPE (etype) || etype == TREE_TYPE (type))))
3642 return fold_convert (type, expr);
3647 return fold_build1 (CONVERT_EXPR, type, expr);
3650 return fold_convert (type, gnat_truthvalue_conversion (expr));
3653 if (TYPE_HAS_ACTUAL_BOUNDS_P (type)
3654 && (ecode == ARRAY_TYPE || ecode == UNCONSTRAINED_ARRAY_TYPE
3655 || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype))))
3656 return unchecked_convert (type, expr, false);
3657 else if (TYPE_BIASED_REPRESENTATION_P (type))
3658 return fold_convert (type,
3659 fold_build2 (MINUS_EXPR, TREE_TYPE (type),
3660 convert (TREE_TYPE (type), expr),
3661 TYPE_MIN_VALUE (type)));
3663 /* ... fall through ... */
3666 return fold (convert_to_integer (type, expr));
3669 case REFERENCE_TYPE:
3670 /* If converting between two pointers to records denoting
3671 both a template and type, adjust if needed to account
3672 for any differing offsets, since one might be negative. */
3673 if (TYPE_THIN_POINTER_P (etype) && TYPE_THIN_POINTER_P (type))
3676 = size_diffop (bit_position (TYPE_FIELDS (TREE_TYPE (etype))),
3677 bit_position (TYPE_FIELDS (TREE_TYPE (type))));
3678 tree byte_diff = size_binop (CEIL_DIV_EXPR, bit_diff,
3679 sbitsize_int (BITS_PER_UNIT));
3681 expr = build1 (NOP_EXPR, type, expr);
3682 TREE_CONSTANT (expr) = TREE_CONSTANT (TREE_OPERAND (expr, 0));
3683 if (integer_zerop (byte_diff))
3686 return build_binary_op (POINTER_PLUS_EXPR, type, expr,
3687 fold (convert (sizetype, byte_diff)));
3690 /* If converting to a thin pointer, handle specially. */
3691 if (TYPE_THIN_POINTER_P (type)
3692 && TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)))
3693 return convert_to_thin_pointer (type, expr);
3695 /* If converting fat pointer to normal pointer, get the pointer to the
3696 array and then convert it. */
3697 else if (TYPE_FAT_POINTER_P (etype))
3698 expr = build_component_ref (expr, get_identifier ("P_ARRAY"),
3701 return fold (convert_to_pointer (type, expr));
3704 return fold (convert_to_real (type, expr));
3707 if (TYPE_JUSTIFIED_MODULAR_P (type) && !AGGREGATE_TYPE_P (etype))
3709 gnat_build_constructor
3710 (type, tree_cons (TYPE_FIELDS (type),
3711 convert (TREE_TYPE (TYPE_FIELDS (type)), expr),
3714 /* ... fall through ... */
3717 /* In these cases, assume the front-end has validated the conversion.
3718 If the conversion is valid, it will be a bit-wise conversion, so
3719 it can be viewed as an unchecked conversion. */
3720 return unchecked_convert (type, expr, false);
3723 /* This is a either a conversion between a tagged type and some
3724 subtype, which we have to mark as a UNION_TYPE because of
3725 overlapping fields or a conversion of an Unchecked_Union. */
3726 return unchecked_convert (type, expr, false);
3728 case UNCONSTRAINED_ARRAY_TYPE:
3729 /* If EXPR is a constrained array, take its address, convert it to a
3730 fat pointer, and then dereference it. Likewise if EXPR is a
3731 record containing both a template and a constrained array.
3732 Note that a record representing a justified modular type
3733 always represents a packed constrained array. */
3734 if (ecode == ARRAY_TYPE
3735 || (ecode == INTEGER_TYPE && TYPE_HAS_ACTUAL_BOUNDS_P (etype))
3736 || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype))
3737 || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype)))
3740 (INDIRECT_REF, NULL_TREE,
3741 convert_to_fat_pointer (TREE_TYPE (type),
3742 build_unary_op (ADDR_EXPR,
3745 /* Do something very similar for converting one unconstrained
3746 array to another. */
3747 else if (ecode == UNCONSTRAINED_ARRAY_TYPE)
3749 build_unary_op (INDIRECT_REF, NULL_TREE,
3750 convert (TREE_TYPE (type),
3751 build_unary_op (ADDR_EXPR,
3757 return fold (convert_to_complex (type, expr));
3764 /* Remove all conversions that are done in EXP. This includes converting
3765 from a padded type or to a justified modular type. If TRUE_ADDRESS
3766 is true, always return the address of the containing object even if
3767 the address is not bit-aligned. */
3770 remove_conversions (tree exp, bool true_address)
3772 switch (TREE_CODE (exp))
3776 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
3777 && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (exp)))
3779 remove_conversions (VEC_index (constructor_elt,
3780 CONSTRUCTOR_ELTS (exp), 0)->value,
3785 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == RECORD_TYPE
3786 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
3787 return remove_conversions (TREE_OPERAND (exp, 0), true_address);
3790 case VIEW_CONVERT_EXPR: case NON_LVALUE_EXPR:
3791 case NOP_EXPR: case CONVERT_EXPR:
3792 return remove_conversions (TREE_OPERAND (exp, 0), true_address);
3801 /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that
3802 refers to the underlying array. If its type has TYPE_CONTAINS_TEMPLATE_P,
3803 likewise return an expression pointing to the underlying array. */
3806 maybe_unconstrained_array (tree exp)
3808 enum tree_code code = TREE_CODE (exp);
3811 switch (TREE_CODE (TREE_TYPE (exp)))
3813 case UNCONSTRAINED_ARRAY_TYPE:
3814 if (code == UNCONSTRAINED_ARRAY_REF)
3817 = build_unary_op (INDIRECT_REF, NULL_TREE,
3818 build_component_ref (TREE_OPERAND (exp, 0),
3819 get_identifier ("P_ARRAY"),
3821 TREE_READONLY (new) = TREE_STATIC (new) = TREE_READONLY (exp);
3825 else if (code == NULL_EXPR)
3826 return build1 (NULL_EXPR,
3827 TREE_TYPE (TREE_TYPE (TYPE_FIELDS
3828 (TREE_TYPE (TREE_TYPE (exp))))),
3829 TREE_OPERAND (exp, 0));
3832 /* If this is a padded type, convert to the unpadded type and see if
3833 it contains a template. */
3834 if (TYPE_IS_PADDING_P (TREE_TYPE (exp)))
3836 new = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp);
3837 if (TREE_CODE (TREE_TYPE (new)) == RECORD_TYPE
3838 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (new)))
3840 build_component_ref (new, NULL_TREE,
3841 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new))),
3844 else if (TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (exp)))
3846 build_component_ref (exp, NULL_TREE,
3847 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (exp))), 0);
3857 /* Return an expression that does an unchecked conversion of EXPR to TYPE.
3858 If NOTRUNC_P is true, truncation operations should be suppressed. */
3861 unchecked_convert (tree type, tree expr, bool notrunc_p)
3863 tree etype = TREE_TYPE (expr);
3865 /* If the expression is already the right type, we are done. */
3869 /* If both types types are integral just do a normal conversion.
3870 Likewise for a conversion to an unconstrained array. */
3871 if ((((INTEGRAL_TYPE_P (type)
3872 && !(TREE_CODE (type) == INTEGER_TYPE
3873 && TYPE_VAX_FLOATING_POINT_P (type)))
3874 || (POINTER_TYPE_P (type) && ! TYPE_THIN_POINTER_P (type))
3875 || (TREE_CODE (type) == RECORD_TYPE
3876 && TYPE_JUSTIFIED_MODULAR_P (type)))
3877 && ((INTEGRAL_TYPE_P (etype)
3878 && !(TREE_CODE (etype) == INTEGER_TYPE
3879 && TYPE_VAX_FLOATING_POINT_P (etype)))
3880 || (POINTER_TYPE_P (etype) && !TYPE_THIN_POINTER_P (etype))
3881 || (TREE_CODE (etype) == RECORD_TYPE
3882 && TYPE_JUSTIFIED_MODULAR_P (etype))))
3883 || TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
3886 bool final_unchecked = false;
3888 if (TREE_CODE (etype) == INTEGER_TYPE
3889 && TYPE_BIASED_REPRESENTATION_P (etype))
3891 tree ntype = copy_type (etype);
3893 TYPE_BIASED_REPRESENTATION_P (ntype) = 0;
3894 TYPE_MAIN_VARIANT (ntype) = ntype;
3895 expr = build1 (NOP_EXPR, ntype, expr);
3898 if (TREE_CODE (type) == INTEGER_TYPE
3899 && TYPE_BIASED_REPRESENTATION_P (type))
3901 rtype = copy_type (type);
3902 TYPE_BIASED_REPRESENTATION_P (rtype) = 0;
3903 TYPE_MAIN_VARIANT (rtype) = rtype;
3906 /* We have another special case: if we are unchecked converting subtype
3907 into a base type, we need to ensure that VRP doesn't propagate range
3908 information since this conversion may be done precisely to validate
3909 that the object is within the range it is supposed to have. */
3910 else if (TREE_CODE (expr) != INTEGER_CST
3911 && TREE_CODE (type) == INTEGER_TYPE && !TREE_TYPE (type)
3912 && ((TREE_CODE (etype) == INTEGER_TYPE && TREE_TYPE (etype))
3913 || TREE_CODE (etype) == ENUMERAL_TYPE
3914 || TREE_CODE (etype) == BOOLEAN_TYPE))
3916 /* The optimization barrier is a VIEW_CONVERT_EXPR node; moreover,
3917 in order not to be deemed an useless type conversion, it must
3918 be from subtype to base type.
3920 ??? This may raise addressability and/or aliasing issues because
3921 VIEW_CONVERT_EXPR gets gimplified as an lvalue, thus causing the
3922 address of its operand to be taken if it is deemed addressable
3923 and not already in GIMPLE form. */
3924 rtype = gnat_type_for_mode (TYPE_MODE (type), TYPE_UNSIGNED (type));
3925 rtype = copy_type (rtype);
3926 TYPE_MAIN_VARIANT (rtype) = rtype;
3927 TREE_TYPE (rtype) = type;
3928 final_unchecked = true;
3931 expr = convert (rtype, expr);
3933 expr = fold_build1 (final_unchecked ? VIEW_CONVERT_EXPR : NOP_EXPR,
3937 /* If we are converting TO an integral type whose precision is not the
3938 same as its size, first unchecked convert to a record that contains
3939 an object of the output type. Then extract the field. */
3940 else if (INTEGRAL_TYPE_P (type) && TYPE_RM_SIZE (type)
3941 && 0 != compare_tree_int (TYPE_RM_SIZE (type),
3942 GET_MODE_BITSIZE (TYPE_MODE (type))))
3944 tree rec_type = make_node (RECORD_TYPE);
3945 tree field = create_field_decl (get_identifier ("OBJ"), type,
3946 rec_type, 1, 0, 0, 0);
3948 TYPE_FIELDS (rec_type) = field;
3949 layout_type (rec_type);
3951 expr = unchecked_convert (rec_type, expr, notrunc_p);
3952 expr = build_component_ref (expr, NULL_TREE, field, 0);
3955 /* Similarly for integral input type whose precision is not equal to its
3957 else if (INTEGRAL_TYPE_P (etype) && TYPE_RM_SIZE (etype)
3958 && 0 != compare_tree_int (TYPE_RM_SIZE (etype),
3959 GET_MODE_BITSIZE (TYPE_MODE (etype))))
3961 tree rec_type = make_node (RECORD_TYPE);
3963 = create_field_decl (get_identifier ("OBJ"), etype, rec_type,
3966 TYPE_FIELDS (rec_type) = field;
3967 layout_type (rec_type);
3969 expr = gnat_build_constructor (rec_type, build_tree_list (field, expr));
3970 expr = unchecked_convert (type, expr, notrunc_p);
3973 /* We have a special case when we are converting between two
3974 unconstrained array types. In that case, take the address,
3975 convert the fat pointer types, and dereference. */
3976 else if (TREE_CODE (etype) == UNCONSTRAINED_ARRAY_TYPE
3977 && TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
3978 expr = build_unary_op (INDIRECT_REF, NULL_TREE,
3979 build1 (VIEW_CONVERT_EXPR, TREE_TYPE (type),
3980 build_unary_op (ADDR_EXPR, NULL_TREE,
3984 expr = maybe_unconstrained_array (expr);
3985 etype = TREE_TYPE (expr);
3986 expr = fold_build1 (VIEW_CONVERT_EXPR, type, expr);
3989 /* If the result is an integral type whose size is not equal to
3990 the size of the underlying machine type, sign- or zero-extend
3991 the result. We need not do this in the case where the input is
3992 an integral type of the same precision and signedness or if the output
3993 is a biased type or if both the input and output are unsigned. */
3995 && INTEGRAL_TYPE_P (type) && TYPE_RM_SIZE (type)
3996 && !(TREE_CODE (type) == INTEGER_TYPE
3997 && TYPE_BIASED_REPRESENTATION_P (type))
3998 && 0 != compare_tree_int (TYPE_RM_SIZE (type),
3999 GET_MODE_BITSIZE (TYPE_MODE (type)))
4000 && !(INTEGRAL_TYPE_P (etype)
4001 && TYPE_UNSIGNED (type) == TYPE_UNSIGNED (etype)
4002 && operand_equal_p (TYPE_RM_SIZE (type),
4003 (TYPE_RM_SIZE (etype) != 0
4004 ? TYPE_RM_SIZE (etype) : TYPE_SIZE (etype)),
4006 && !(TYPE_UNSIGNED (type) && TYPE_UNSIGNED (etype)))
4008 tree base_type = gnat_type_for_mode (TYPE_MODE (type),
4009 TYPE_UNSIGNED (type));
4011 = convert (base_type,
4012 size_binop (MINUS_EXPR,
4014 (GET_MODE_BITSIZE (TYPE_MODE (type))),
4015 TYPE_RM_SIZE (type)));
4018 build_binary_op (RSHIFT_EXPR, base_type,
4019 build_binary_op (LSHIFT_EXPR, base_type,
4020 convert (base_type, expr),
4025 /* An unchecked conversion should never raise Constraint_Error. The code
4026 below assumes that GCC's conversion routines overflow the same way that
4027 the underlying hardware does. This is probably true. In the rare case
4028 when it is false, we can rely on the fact that such conversions are
4029 erroneous anyway. */
4030 if (TREE_CODE (expr) == INTEGER_CST)
4031 TREE_OVERFLOW (expr) = 0;
4033 /* If the sizes of the types differ and this is an VIEW_CONVERT_EXPR,
4034 show no longer constant. */
4035 if (TREE_CODE (expr) == VIEW_CONVERT_EXPR
4036 && !operand_equal_p (TYPE_SIZE_UNIT (type), TYPE_SIZE_UNIT (etype),
4038 TREE_CONSTANT (expr) = 0;
4043 /* Return the appropriate GCC tree code for the specified GNAT type,
4044 the latter being a record type as predicated by Is_Record_Type. */
4047 tree_code_for_record_type (Entity_Id gnat_type)
4049 Node_Id component_list
4050 = Component_List (Type_Definition
4052 (Implementation_Base_Type (gnat_type))));
4055 /* Make this a UNION_TYPE unless it's either not an Unchecked_Union or
4056 we have a non-discriminant field outside a variant. In either case,
4057 it's a RECORD_TYPE. */
4059 if (!Is_Unchecked_Union (gnat_type))
4062 for (component = First_Non_Pragma (Component_Items (component_list));
4063 Present (component);
4064 component = Next_Non_Pragma (component))
4065 if (Ekind (Defining_Entity (component)) == E_Component)
4071 /* Return true if GNU_TYPE is suitable as the type of a non-aliased
4072 component of an aggregate type. */
4075 type_for_nonaliased_component_p (tree gnu_type)
4077 /* If the type is passed by reference, we may have pointers to the
4078 component so it cannot be made non-aliased. */
4079 if (must_pass_by_ref (gnu_type) || default_pass_by_ref (gnu_type))
4082 /* We used to say that any component of aggregate type is aliased
4083 because the front-end may take 'Reference of it. The front-end
4084 has been enhanced in the meantime so as to use a renaming instead
4085 in most cases, but the back-end can probably take the address of
4086 such a component too so we go for the conservative stance.
4088 For instance, we might need the address of any array type, even
4089 if normally passed by copy, to construct a fat pointer if the
4090 component is used as an actual for an unconstrained formal.
4092 Likewise for record types: even if a specific record subtype is
4093 passed by copy, the parent type might be passed by ref (e.g. if
4094 it's of variable size) and we might take the address of a child
4095 component to pass to a parent formal. We have no way to check
4096 for such conditions here. */
4097 if (AGGREGATE_TYPE_P (gnu_type))
4103 /* Perform final processing on global variables. */
4106 gnat_write_global_declarations (void)
4108 /* Proceed to optimize and emit assembly.
4109 FIXME: shouldn't be the front end's responsibility to call this. */
4112 /* Emit debug info for all global declarations. */
4113 emit_debug_global_declarations (VEC_address (tree, global_decls),
4114 VEC_length (tree, global_decls));
4117 /* ************************************************************************
4118 * * GCC builtins support *
4119 * ************************************************************************ */
4121 /* The general scheme is fairly simple:
4123 For each builtin function/type to be declared, gnat_install_builtins calls
4124 internal facilities which eventually get to gnat_push_decl, which in turn
4125 tracks the so declared builtin function decls in the 'builtin_decls' global
4126 datastructure. When an Intrinsic subprogram declaration is processed, we
4127 search this global datastructure to retrieve the associated BUILT_IN DECL
4130 /* Search the chain of currently available builtin declarations for a node
4131 corresponding to function NAME (an IDENTIFIER_NODE). Return the first node
4132 found, if any, or NULL_TREE otherwise. */
4134 builtin_decl_for (tree name)
4139 for (i = 0; VEC_iterate(tree, builtin_decls, i, decl); i++)
4140 if (DECL_NAME (decl) == name)
4146 /* The code below eventually exposes gnat_install_builtins, which declares
4147 the builtin types and functions we might need, either internally or as
4148 user accessible facilities.
4150 ??? This is a first implementation shot, still in rough shape. It is
4151 heavily inspired from the "C" family implementation, with chunks copied
4152 verbatim from there.
4154 Two obvious TODO candidates are
4155 o Use a more efficient name/decl mapping scheme
4156 o Devise a middle-end infrastructure to avoid having to copy
4157 pieces between front-ends. */
4159 /* ----------------------------------------------------------------------- *
4160 * BUILTIN ELEMENTARY TYPES *
4161 * ----------------------------------------------------------------------- */
4163 /* Standard data types to be used in builtin argument declarations. */
4167 CTI_SIGNED_SIZE_TYPE, /* For format checking only. */
4169 CTI_CONST_STRING_TYPE,
4174 static tree c_global_trees[CTI_MAX];
4176 #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE]
4177 #define string_type_node c_global_trees[CTI_STRING_TYPE]
4178 #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE]
4180 /* ??? In addition some attribute handlers, we currently don't support a
4181 (small) number of builtin-types, which in turns inhibits support for a
4182 number of builtin functions. */
4183 #define wint_type_node void_type_node
4184 #define intmax_type_node void_type_node
4185 #define uintmax_type_node void_type_node
4187 /* Build the void_list_node (void_type_node having been created). */
4190 build_void_list_node (void)
4192 tree t = build_tree_list (NULL_TREE, void_type_node);
4196 /* Used to help initialize the builtin-types.def table. When a type of
4197 the correct size doesn't exist, use error_mark_node instead of NULL.
4198 The later results in segfaults even when a decl using the type doesn't
4202 builtin_type_for_size (int size, bool unsignedp)
4204 tree type = lang_hooks.types.type_for_size (size, unsignedp);
4205 return type ? type : error_mark_node;
4208 /* Build/push the elementary type decls that builtin functions/types
4212 install_builtin_elementary_types (void)
4214 signed_size_type_node = size_type_node;
4215 pid_type_node = integer_type_node;
4216 void_list_node = build_void_list_node ();
4218 string_type_node = build_pointer_type (char_type_node);
4219 const_string_type_node
4220 = build_pointer_type (build_qualified_type
4221 (char_type_node, TYPE_QUAL_CONST));
4224 /* ----------------------------------------------------------------------- *
4225 * BUILTIN FUNCTION TYPES *
4226 * ----------------------------------------------------------------------- */
4228 /* Now, builtin function types per se. */
4232 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
4233 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
4234 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
4235 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
4236 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
4237 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
4238 #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME,
4239 #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME,
4240 #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME,
4241 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
4242 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
4243 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
4244 #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
4245 #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
4246 #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \
4248 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
4249 #include "builtin-types.def"
4250 #undef DEF_PRIMITIVE_TYPE
4251 #undef DEF_FUNCTION_TYPE_0
4252 #undef DEF_FUNCTION_TYPE_1
4253 #undef DEF_FUNCTION_TYPE_2
4254 #undef DEF_FUNCTION_TYPE_3
4255 #undef DEF_FUNCTION_TYPE_4
4256 #undef DEF_FUNCTION_TYPE_5
4257 #undef DEF_FUNCTION_TYPE_6
4258 #undef DEF_FUNCTION_TYPE_7
4259 #undef DEF_FUNCTION_TYPE_VAR_0
4260 #undef DEF_FUNCTION_TYPE_VAR_1
4261 #undef DEF_FUNCTION_TYPE_VAR_2
4262 #undef DEF_FUNCTION_TYPE_VAR_3
4263 #undef DEF_FUNCTION_TYPE_VAR_4
4264 #undef DEF_FUNCTION_TYPE_VAR_5
4265 #undef DEF_POINTER_TYPE
4269 typedef enum c_builtin_type builtin_type;
4271 /* A temporary array used in communication with def_fn_type. */
4272 static GTY(()) tree builtin_types[(int) BT_LAST + 1];
4274 /* A helper function for install_builtin_types. Build function type
4275 for DEF with return type RET and N arguments. If VAR is true, then the
4276 function should be variadic after those N arguments.
4278 Takes special care not to ICE if any of the types involved are
4279 error_mark_node, which indicates that said type is not in fact available
4280 (see builtin_type_for_size). In which case the function type as a whole
4281 should be error_mark_node. */
4284 def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...)
4286 tree args = NULL, t;
4291 for (i = 0; i < n; ++i)
4293 builtin_type a = va_arg (list, builtin_type);
4294 t = builtin_types[a];
4295 if (t == error_mark_node)
4297 args = tree_cons (NULL_TREE, t, args);
4301 args = nreverse (args);
4303 args = chainon (args, void_list_node);
4305 t = builtin_types[ret];
4306 if (t == error_mark_node)
4308 t = build_function_type (t, args);
4311 builtin_types[def] = t;
4314 /* Build the builtin function types and install them in the builtin_types
4315 array for later use in builtin function decls. */
4318 install_builtin_function_types (void)
4320 tree va_list_ref_type_node;
4321 tree va_list_arg_type_node;
4323 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
4325 va_list_arg_type_node = va_list_ref_type_node =
4326 build_pointer_type (TREE_TYPE (va_list_type_node));
4330 va_list_arg_type_node = va_list_type_node;
4331 va_list_ref_type_node = build_reference_type (va_list_type_node);
4334 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \
4335 builtin_types[ENUM] = VALUE;
4336 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \
4337 def_fn_type (ENUM, RETURN, 0, 0);
4338 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \
4339 def_fn_type (ENUM, RETURN, 0, 1, ARG1);
4340 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \
4341 def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2);
4342 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
4343 def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3);
4344 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
4345 def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4);
4346 #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \
4347 def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5);
4348 #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \
4350 def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6);
4351 #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \
4353 def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7);
4354 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \
4355 def_fn_type (ENUM, RETURN, 1, 0);
4356 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \
4357 def_fn_type (ENUM, RETURN, 1, 1, ARG1);
4358 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \
4359 def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2);
4360 #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
4361 def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3);
4362 #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
4363 def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4);
4364 #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \
4365 def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5);
4366 #define DEF_POINTER_TYPE(ENUM, TYPE) \
4367 builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]);
4369 #include "builtin-types.def"
4371 #undef DEF_PRIMITIVE_TYPE
4372 #undef DEF_FUNCTION_TYPE_1
4373 #undef DEF_FUNCTION_TYPE_2
4374 #undef DEF_FUNCTION_TYPE_3
4375 #undef DEF_FUNCTION_TYPE_4
4376 #undef DEF_FUNCTION_TYPE_5
4377 #undef DEF_FUNCTION_TYPE_6
4378 #undef DEF_FUNCTION_TYPE_VAR_0
4379 #undef DEF_FUNCTION_TYPE_VAR_1
4380 #undef DEF_FUNCTION_TYPE_VAR_2
4381 #undef DEF_FUNCTION_TYPE_VAR_3
4382 #undef DEF_FUNCTION_TYPE_VAR_4
4383 #undef DEF_FUNCTION_TYPE_VAR_5
4384 #undef DEF_POINTER_TYPE
4385 builtin_types[(int) BT_LAST] = NULL_TREE;
4388 /* ----------------------------------------------------------------------- *
4389 * BUILTIN ATTRIBUTES *
4390 * ----------------------------------------------------------------------- */
4392 enum built_in_attribute
4394 #define DEF_ATTR_NULL_TREE(ENUM) ENUM,
4395 #define DEF_ATTR_INT(ENUM, VALUE) ENUM,
4396 #define DEF_ATTR_IDENT(ENUM, STRING) ENUM,
4397 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM,
4398 #include "builtin-attrs.def"
4399 #undef DEF_ATTR_NULL_TREE
4401 #undef DEF_ATTR_IDENT
4402 #undef DEF_ATTR_TREE_LIST
4406 static GTY(()) tree built_in_attributes[(int) ATTR_LAST];
4409 install_builtin_attributes (void)
4411 /* Fill in the built_in_attributes array. */
4412 #define DEF_ATTR_NULL_TREE(ENUM) \
4413 built_in_attributes[(int) ENUM] = NULL_TREE;
4414 #define DEF_ATTR_INT(ENUM, VALUE) \
4415 built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE);
4416 #define DEF_ATTR_IDENT(ENUM, STRING) \
4417 built_in_attributes[(int) ENUM] = get_identifier (STRING);
4418 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \
4419 built_in_attributes[(int) ENUM] \
4420 = tree_cons (built_in_attributes[(int) PURPOSE], \
4421 built_in_attributes[(int) VALUE], \
4422 built_in_attributes[(int) CHAIN]);
4423 #include "builtin-attrs.def"
4424 #undef DEF_ATTR_NULL_TREE
4426 #undef DEF_ATTR_IDENT
4427 #undef DEF_ATTR_TREE_LIST
4430 /* Handle a "const" attribute; arguments as in
4431 struct attribute_spec.handler. */
4434 handle_const_attribute (tree *node, tree ARG_UNUSED (name),
4435 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
4438 if (TREE_CODE (*node) == FUNCTION_DECL)
4439 TREE_READONLY (*node) = 1;
4441 *no_add_attrs = true;
4446 /* Handle a "nothrow" attribute; arguments as in
4447 struct attribute_spec.handler. */
4450 handle_nothrow_attribute (tree *node, tree ARG_UNUSED (name),
4451 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
4454 if (TREE_CODE (*node) == FUNCTION_DECL)
4455 TREE_NOTHROW (*node) = 1;
4457 *no_add_attrs = true;
4462 /* Handle a "pure" attribute; arguments as in
4463 struct attribute_spec.handler. */
4466 handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4467 int ARG_UNUSED (flags), bool *no_add_attrs)
4469 if (TREE_CODE (*node) == FUNCTION_DECL)
4470 DECL_IS_PURE (*node) = 1;
4471 /* ??? TODO: Support types. */
4474 warning (OPT_Wattributes, "%qE attribute ignored", name);
4475 *no_add_attrs = true;
4481 /* Handle a "no vops" attribute; arguments as in
4482 struct attribute_spec.handler. */
4485 handle_novops_attribute (tree *node, tree ARG_UNUSED (name),
4486 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
4487 bool *ARG_UNUSED (no_add_attrs))
4489 gcc_assert (TREE_CODE (*node) == FUNCTION_DECL);
4490 DECL_IS_NOVOPS (*node) = 1;
4494 /* Helper for nonnull attribute handling; fetch the operand number
4495 from the attribute argument list. */
4498 get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp)
4500 /* Verify the arg number is a constant. */
4501 if (TREE_CODE (arg_num_expr) != INTEGER_CST
4502 || TREE_INT_CST_HIGH (arg_num_expr) != 0)
4505 *valp = TREE_INT_CST_LOW (arg_num_expr);
4509 /* Handle the "nonnull" attribute. */
4511 handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name),
4512 tree args, int ARG_UNUSED (flags),
4516 unsigned HOST_WIDE_INT attr_arg_num;
4518 /* If no arguments are specified, all pointer arguments should be
4519 non-null. Verify a full prototype is given so that the arguments
4520 will have the correct types when we actually check them later. */
4523 if (!TYPE_ARG_TYPES (type))
4525 error ("nonnull attribute without arguments on a non-prototype");
4526 *no_add_attrs = true;
4531 /* Argument list specified. Verify that each argument number references
4532 a pointer argument. */
4533 for (attr_arg_num = 1; args; args = TREE_CHAIN (args))
4536 unsigned HOST_WIDE_INT arg_num = 0, ck_num;
4538 if (!get_nonnull_operand (TREE_VALUE (args), &arg_num))
4540 error ("nonnull argument has invalid operand number (argument %lu)",
4541 (unsigned long) attr_arg_num);
4542 *no_add_attrs = true;
4546 argument = TYPE_ARG_TYPES (type);
4549 for (ck_num = 1; ; ck_num++)
4551 if (!argument || ck_num == arg_num)
4553 argument = TREE_CHAIN (argument);
4557 || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE)
4559 error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)",
4560 (unsigned long) attr_arg_num, (unsigned long) arg_num);
4561 *no_add_attrs = true;
4565 if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE)
4567 error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)",
4568 (unsigned long) attr_arg_num, (unsigned long) arg_num);
4569 *no_add_attrs = true;
4578 /* Handle a "sentinel" attribute. */
4581 handle_sentinel_attribute (tree *node, tree name, tree args,
4582 int ARG_UNUSED (flags), bool *no_add_attrs)
4584 tree params = TYPE_ARG_TYPES (*node);
4588 warning (OPT_Wattributes,
4589 "%qE attribute requires prototypes with named arguments", name);
4590 *no_add_attrs = true;
4594 while (TREE_CHAIN (params))
4595 params = TREE_CHAIN (params);
4597 if (VOID_TYPE_P (TREE_VALUE (params)))
4599 warning (OPT_Wattributes,
4600 "%qE attribute only applies to variadic functions", name);
4601 *no_add_attrs = true;
4607 tree position = TREE_VALUE (args);
4609 if (TREE_CODE (position) != INTEGER_CST)
4611 warning (0, "requested position is not an integer constant");
4612 *no_add_attrs = true;
4616 if (tree_int_cst_lt (position, integer_zero_node))
4618 warning (0, "requested position is less than zero");
4619 *no_add_attrs = true;
4627 /* Handle a "noreturn" attribute; arguments as in
4628 struct attribute_spec.handler. */
4631 handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4632 int ARG_UNUSED (flags), bool *no_add_attrs)
4634 tree type = TREE_TYPE (*node);
4636 /* See FIXME comment in c_common_attribute_table. */
4637 if (TREE_CODE (*node) == FUNCTION_DECL)
4638 TREE_THIS_VOLATILE (*node) = 1;
4639 else if (TREE_CODE (type) == POINTER_TYPE
4640 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
4642 = build_pointer_type
4643 (build_type_variant (TREE_TYPE (type),
4644 TYPE_READONLY (TREE_TYPE (type)), 1));
4647 warning (OPT_Wattributes, "%qE attribute ignored", name);
4648 *no_add_attrs = true;
4654 /* Handle a "malloc" attribute; arguments as in
4655 struct attribute_spec.handler. */
4658 handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args),
4659 int ARG_UNUSED (flags), bool *no_add_attrs)
4661 if (TREE_CODE (*node) == FUNCTION_DECL
4662 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node))))
4663 DECL_IS_MALLOC (*node) = 1;
4666 warning (OPT_Wattributes, "%qE attribute ignored", name);
4667 *no_add_attrs = true;
4673 /* Fake handler for attributes we don't properly support. */
4676 fake_attribute_handler (tree * ARG_UNUSED (node),
4677 tree ARG_UNUSED (name),
4678 tree ARG_UNUSED (args),
4679 int ARG_UNUSED (flags),
4680 bool * ARG_UNUSED (no_add_attrs))
4685 /* Handle a "type_generic" attribute. */
4688 handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name),
4689 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
4690 bool * ARG_UNUSED (no_add_attrs))
4692 /* Ensure we have a function type, with no arguments. */
4693 gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE && ! TYPE_ARG_TYPES (*node));
4698 /* ----------------------------------------------------------------------- *
4699 * BUILTIN FUNCTIONS *
4700 * ----------------------------------------------------------------------- */
4702 /* Worker for DEF_BUILTIN. Possibly define a builtin function with one or two
4703 names. Does not declare a non-__builtin_ function if flag_no_builtin, or
4704 if nonansi_p and flag_no_nonansi_builtin. */
4707 def_builtin_1 (enum built_in_function fncode,
4709 enum built_in_class fnclass,
4710 tree fntype, tree libtype,
4711 bool both_p, bool fallback_p,
4712 bool nonansi_p ATTRIBUTE_UNUSED,
4713 tree fnattrs, bool implicit_p)
4716 const char *libname;
4718 /* Preserve an already installed decl. It most likely was setup in advance
4719 (e.g. as part of the internal builtins) for specific reasons. */
4720 if (built_in_decls[(int) fncode] != NULL_TREE)
4723 gcc_assert ((!both_p && !fallback_p)
4724 || !strncmp (name, "__builtin_",
4725 strlen ("__builtin_")));
4727 libname = name + strlen ("__builtin_");
4728 decl = add_builtin_function (name, fntype, fncode, fnclass,
4729 (fallback_p ? libname : NULL),
4732 /* ??? This is normally further controlled by command-line options
4733 like -fno-builtin, but we don't have them for Ada. */
4734 add_builtin_function (libname, libtype, fncode, fnclass,
4737 built_in_decls[(int) fncode] = decl;
4739 implicit_built_in_decls[(int) fncode] = decl;
4742 static int flag_isoc94 = 0;
4743 static int flag_isoc99 = 0;
4745 /* Install what the common builtins.def offers. */
4748 install_builtin_functions (void)
4750 #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \
4751 NONANSI_P, ATTRS, IMPLICIT, COND) \
4753 def_builtin_1 (ENUM, NAME, CLASS, \
4754 builtin_types[(int) TYPE], \
4755 builtin_types[(int) LIBTYPE], \
4756 BOTH_P, FALLBACK_P, NONANSI_P, \
4757 built_in_attributes[(int) ATTRS], IMPLICIT);
4758 #include "builtins.def"
4762 /* ----------------------------------------------------------------------- *
4763 * BUILTIN FUNCTIONS *
4764 * ----------------------------------------------------------------------- */
4766 /* Install the builtin functions we might need. */
4769 gnat_install_builtins (void)
4771 install_builtin_elementary_types ();
4772 install_builtin_function_types ();
4773 install_builtin_attributes ();
4775 /* Install builtins used by generic middle-end pieces first. Some of these
4776 know about internal specificities and control attributes accordingly, for
4777 instance __builtin_alloca vs no-throw and -fstack-check. We will ignore
4778 the generic definition from builtins.def. */
4779 build_common_builtin_nodes ();
4781 /* Now, install the target specific builtins, such as the AltiVec family on
4782 ppc, and the common set as exposed by builtins.def. */
4783 targetm.init_builtins ();
4784 install_builtin_functions ();
4787 #include "gt-ada-utils.h"
4788 #include "gtype-ada.h"
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