1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2009, 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"
44 #include "langhooks.h"
45 #include "pointer-set.h"
47 #include "tree-dump.h"
48 #include "tree-inline.h"
49 #include "tree-iterator.h"
66 #ifndef MAX_FIXED_MODE_SIZE
67 #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode)
70 #ifndef MAX_BITS_PER_WORD
71 #define MAX_BITS_PER_WORD BITS_PER_WORD
74 /* If nonzero, pretend we are allocating at global level. */
77 /* The default alignment of "double" floating-point types, i.e. floating
78 point types whose size is equal to 64 bits, or 0 if this alignment is
79 not specifically capped. */
80 int double_float_alignment;
82 /* The default alignment of "double" or larger scalar types, i.e. scalar
83 types whose size is greater or equal to 64 bits, or 0 if this alignment
84 is not specifically capped. */
85 int double_scalar_alignment;
87 /* Tree nodes for the various types and decls we create. */
88 tree gnat_std_decls[(int) ADT_LAST];
90 /* Functions to call for each of the possible raise reasons. */
91 tree gnat_raise_decls[(int) LAST_REASON_CODE + 1];
93 /* Forward declarations for handlers of attributes. */
94 static tree handle_const_attribute (tree *, tree, tree, int, bool *);
95 static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *);
96 static tree handle_pure_attribute (tree *, tree, tree, int, bool *);
97 static tree handle_novops_attribute (tree *, tree, tree, int, bool *);
98 static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *);
99 static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *);
100 static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *);
101 static tree handle_malloc_attribute (tree *, tree, tree, int, bool *);
102 static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *);
103 static tree handle_vector_size_attribute (tree *, tree, tree, int, bool *);
105 /* Fake handler for attributes we don't properly support, typically because
106 they'd require dragging a lot of the common-c front-end circuitry. */
107 static tree fake_attribute_handler (tree *, tree, tree, int, bool *);
109 /* Table of machine-independent internal attributes for Ada. We support
110 this minimal set of attributes to accommodate the needs of builtins. */
111 const struct attribute_spec gnat_internal_attribute_table[] =
113 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
114 { "const", 0, 0, true, false, false, handle_const_attribute },
115 { "nothrow", 0, 0, true, false, false, handle_nothrow_attribute },
116 { "pure", 0, 0, true, false, false, handle_pure_attribute },
117 { "no vops", 0, 0, true, false, false, handle_novops_attribute },
118 { "nonnull", 0, -1, false, true, true, handle_nonnull_attribute },
119 { "sentinel", 0, 1, false, true, true, handle_sentinel_attribute },
120 { "noreturn", 0, 0, true, false, false, handle_noreturn_attribute },
121 { "malloc", 0, 0, true, false, false, handle_malloc_attribute },
122 { "type generic", 0, 0, false, true, true, handle_type_generic_attribute },
124 { "vector_size", 1, 1, false, true, false, handle_vector_size_attribute },
126 /* ??? format and format_arg are heavy and not supported, which actually
127 prevents support for stdio builtins, which we however declare as part
128 of the common builtins.def contents. */
129 { "format", 3, 3, false, true, true, fake_attribute_handler },
130 { "format_arg", 1, 1, false, true, true, fake_attribute_handler },
132 { NULL, 0, 0, false, false, false, NULL }
135 /* Associates a GNAT tree node to a GCC tree node. It is used in
136 `save_gnu_tree', `get_gnu_tree' and `present_gnu_tree'. See documentation
137 of `save_gnu_tree' for more info. */
138 static GTY((length ("max_gnat_nodes"))) tree *associate_gnat_to_gnu;
140 #define GET_GNU_TREE(GNAT_ENTITY) \
141 associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id]
143 #define SET_GNU_TREE(GNAT_ENTITY,VAL) \
144 associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] = (VAL)
146 #define PRESENT_GNU_TREE(GNAT_ENTITY) \
147 (associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE)
149 /* Associates a GNAT entity to a GCC tree node used as a dummy, if any. */
150 static GTY((length ("max_gnat_nodes"))) tree *dummy_node_table;
152 #define GET_DUMMY_NODE(GNAT_ENTITY) \
153 dummy_node_table[(GNAT_ENTITY) - First_Node_Id]
155 #define SET_DUMMY_NODE(GNAT_ENTITY,VAL) \
156 dummy_node_table[(GNAT_ENTITY) - First_Node_Id] = (VAL)
158 #define PRESENT_DUMMY_NODE(GNAT_ENTITY) \
159 (dummy_node_table[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE)
161 /* This variable keeps a table for types for each precision so that we only
162 allocate each of them once. Signed and unsigned types are kept separate.
164 Note that these types are only used when fold-const requests something
165 special. Perhaps we should NOT share these types; we'll see how it
167 static GTY(()) tree signed_and_unsigned_types[2 * MAX_BITS_PER_WORD + 1][2];
169 /* Likewise for float types, but record these by mode. */
170 static GTY(()) tree float_types[NUM_MACHINE_MODES];
172 /* For each binding contour we allocate a binding_level structure to indicate
173 the binding depth. */
175 struct GTY((chain_next ("%h.chain"))) gnat_binding_level {
176 /* The binding level containing this one (the enclosing binding level). */
177 struct gnat_binding_level *chain;
178 /* The BLOCK node for this level. */
180 /* If nonzero, the setjmp buffer that needs to be updated for any
181 variable-sized definition within this context. */
185 /* The binding level currently in effect. */
186 static GTY(()) struct gnat_binding_level *current_binding_level;
188 /* A chain of gnat_binding_level structures awaiting reuse. */
189 static GTY((deletable)) struct gnat_binding_level *free_binding_level;
191 /* An array of global declarations. */
192 static GTY(()) VEC(tree,gc) *global_decls;
194 /* An array of builtin function declarations. */
195 static GTY(()) VEC(tree,gc) *builtin_decls;
197 /* An array of global renaming pointers. */
198 static GTY(()) VEC(tree,gc) *global_renaming_pointers;
200 /* A chain of unused BLOCK nodes. */
201 static GTY((deletable)) tree free_block_chain;
203 static tree merge_sizes (tree, tree, tree, bool, bool);
204 static tree compute_related_constant (tree, tree);
205 static tree split_plus (tree, tree *);
206 static void gnat_gimplify_function (tree);
207 static tree float_type_for_precision (int, enum machine_mode);
208 static tree convert_to_fat_pointer (tree, tree);
209 static tree convert_to_thin_pointer (tree, tree);
210 static tree make_descriptor_field (const char *,tree, tree, tree);
211 static bool potential_alignment_gap (tree, tree, tree);
213 /* Initialize the association of GNAT nodes to GCC trees. */
216 init_gnat_to_gnu (void)
218 associate_gnat_to_gnu
219 = (tree *) ggc_alloc_cleared (max_gnat_nodes * sizeof (tree));
222 /* GNAT_ENTITY is a GNAT tree node for an entity. GNU_DECL is the GCC tree
223 which is to be associated with GNAT_ENTITY. Such GCC tree node is always
224 a ..._DECL node. If NO_CHECK is true, the latter check is suppressed.
226 If GNU_DECL is zero, a previous association is to be reset. */
229 save_gnu_tree (Entity_Id gnat_entity, tree gnu_decl, bool no_check)
231 /* Check that GNAT_ENTITY is not already defined and that it is being set
232 to something which is a decl. Raise gigi 401 if not. Usually, this
233 means GNAT_ENTITY is defined twice, but occasionally is due to some
235 gcc_assert (!(gnu_decl
236 && (PRESENT_GNU_TREE (gnat_entity)
237 || (!no_check && !DECL_P (gnu_decl)))));
239 SET_GNU_TREE (gnat_entity, gnu_decl);
242 /* GNAT_ENTITY is a GNAT tree node for a defining identifier.
243 Return the ..._DECL node that was associated with it. If there is no tree
244 node associated with GNAT_ENTITY, abort.
246 In some cases, such as delayed elaboration or expressions that need to
247 be elaborated only once, GNAT_ENTITY is really not an entity. */
250 get_gnu_tree (Entity_Id gnat_entity)
252 gcc_assert (PRESENT_GNU_TREE (gnat_entity));
253 return GET_GNU_TREE (gnat_entity);
256 /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */
259 present_gnu_tree (Entity_Id gnat_entity)
261 return PRESENT_GNU_TREE (gnat_entity);
264 /* Initialize the association of GNAT nodes to GCC trees as dummies. */
267 init_dummy_type (void)
270 = (tree *) ggc_alloc_cleared (max_gnat_nodes * sizeof (tree));
273 /* Make a dummy type corresponding to GNAT_TYPE. */
276 make_dummy_type (Entity_Id gnat_type)
278 Entity_Id gnat_underlying = Gigi_Equivalent_Type (gnat_type);
281 /* If there is an equivalent type, get its underlying type. */
282 if (Present (gnat_underlying))
283 gnat_underlying = Underlying_Type (gnat_underlying);
285 /* If there was no equivalent type (can only happen when just annotating
286 types) or underlying type, go back to the original type. */
287 if (No (gnat_underlying))
288 gnat_underlying = gnat_type;
290 /* If it there already a dummy type, use that one. Else make one. */
291 if (PRESENT_DUMMY_NODE (gnat_underlying))
292 return GET_DUMMY_NODE (gnat_underlying);
294 /* If this is a record, make a RECORD_TYPE or UNION_TYPE; else make
296 gnu_type = make_node (Is_Record_Type (gnat_underlying)
297 ? tree_code_for_record_type (gnat_underlying)
299 TYPE_NAME (gnu_type) = get_entity_name (gnat_type);
300 TYPE_DUMMY_P (gnu_type) = 1;
301 TYPE_STUB_DECL (gnu_type)
302 = create_type_stub_decl (TYPE_NAME (gnu_type), gnu_type);
303 if (AGGREGATE_TYPE_P (gnu_type))
304 TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_type);
306 SET_DUMMY_NODE (gnat_underlying, gnu_type);
311 /* Return nonzero if we are currently in the global binding level. */
314 global_bindings_p (void)
316 return ((force_global || !current_function_decl) ? -1 : 0);
319 /* Enter a new binding level. */
322 gnat_pushlevel (void)
324 struct gnat_binding_level *newlevel = NULL;
326 /* Reuse a struct for this binding level, if there is one. */
327 if (free_binding_level)
329 newlevel = free_binding_level;
330 free_binding_level = free_binding_level->chain;
334 = (struct gnat_binding_level *)
335 ggc_alloc (sizeof (struct gnat_binding_level));
337 /* Use a free BLOCK, if any; otherwise, allocate one. */
338 if (free_block_chain)
340 newlevel->block = free_block_chain;
341 free_block_chain = BLOCK_CHAIN (free_block_chain);
342 BLOCK_CHAIN (newlevel->block) = NULL_TREE;
345 newlevel->block = make_node (BLOCK);
347 /* Point the BLOCK we just made to its parent. */
348 if (current_binding_level)
349 BLOCK_SUPERCONTEXT (newlevel->block) = current_binding_level->block;
351 BLOCK_VARS (newlevel->block) = BLOCK_SUBBLOCKS (newlevel->block) = NULL_TREE;
352 TREE_USED (newlevel->block) = 1;
354 /* Add this level to the front of the chain (stack) of levels that are
356 newlevel->chain = current_binding_level;
357 newlevel->jmpbuf_decl = NULL_TREE;
358 current_binding_level = newlevel;
361 /* Set SUPERCONTEXT of the BLOCK for the current binding level to FNDECL
362 and point FNDECL to this BLOCK. */
365 set_current_block_context (tree fndecl)
367 BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl;
368 DECL_INITIAL (fndecl) = current_binding_level->block;
371 /* Set the jmpbuf_decl for the current binding level to DECL. */
374 set_block_jmpbuf_decl (tree decl)
376 current_binding_level->jmpbuf_decl = decl;
379 /* Get the jmpbuf_decl, if any, for the current binding level. */
382 get_block_jmpbuf_decl (void)
384 return current_binding_level->jmpbuf_decl;
387 /* Exit a binding level. Set any BLOCK into the current code group. */
392 struct gnat_binding_level *level = current_binding_level;
393 tree block = level->block;
395 BLOCK_VARS (block) = nreverse (BLOCK_VARS (block));
396 BLOCK_SUBBLOCKS (block) = nreverse (BLOCK_SUBBLOCKS (block));
398 /* If this is a function-level BLOCK don't do anything. Otherwise, if there
399 are no variables free the block and merge its subblocks into those of its
400 parent block. Otherwise, add it to the list of its parent. */
401 if (TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL)
403 else if (BLOCK_VARS (block) == NULL_TREE)
405 BLOCK_SUBBLOCKS (level->chain->block)
406 = chainon (BLOCK_SUBBLOCKS (block),
407 BLOCK_SUBBLOCKS (level->chain->block));
408 BLOCK_CHAIN (block) = free_block_chain;
409 free_block_chain = block;
413 BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (level->chain->block);
414 BLOCK_SUBBLOCKS (level->chain->block) = block;
415 TREE_USED (block) = 1;
416 set_block_for_group (block);
419 /* Free this binding structure. */
420 current_binding_level = level->chain;
421 level->chain = free_binding_level;
422 free_binding_level = level;
426 /* Records a ..._DECL node DECL as belonging to the current lexical scope
427 and uses GNAT_NODE for location information and propagating flags. */
430 gnat_pushdecl (tree decl, Node_Id gnat_node)
432 /* If this decl is public external or at toplevel, there is no context.
433 But PARM_DECLs always go in the level of its function. */
434 if (TREE_CODE (decl) != PARM_DECL
435 && ((DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
436 || global_bindings_p ()))
437 DECL_CONTEXT (decl) = 0;
440 DECL_CONTEXT (decl) = current_function_decl;
442 /* Functions imported in another function are not really nested. */
443 if (TREE_CODE (decl) == FUNCTION_DECL && TREE_PUBLIC (decl))
444 DECL_NO_STATIC_CHAIN (decl) = 1;
447 TREE_NO_WARNING (decl) = (gnat_node == Empty || Warnings_Off (gnat_node));
449 /* Set the location of DECL and emit a declaration for it. */
450 if (Present (gnat_node))
451 Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (decl));
452 add_decl_expr (decl, gnat_node);
454 /* Put the declaration on the list. The list of declarations is in reverse
455 order. The list will be reversed later. Put global variables in the
456 globals list and builtin functions in a dedicated list to speed up
457 further lookups. Don't put TYPE_DECLs for UNCONSTRAINED_ARRAY_TYPE into
458 the list, as they will cause trouble with the debugger and aren't needed
460 if (TREE_CODE (decl) != TYPE_DECL
461 || TREE_CODE (TREE_TYPE (decl)) != UNCONSTRAINED_ARRAY_TYPE)
463 if (global_bindings_p ())
465 VEC_safe_push (tree, gc, global_decls, decl);
467 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
468 VEC_safe_push (tree, gc, builtin_decls, decl);
472 TREE_CHAIN (decl) = BLOCK_VARS (current_binding_level->block);
473 BLOCK_VARS (current_binding_level->block) = decl;
477 /* For the declaration of a type, set its name if it either is not already
478 set or if the previous type name was not derived from a source name.
479 We'd rather have the type named with a real name and all the pointer
480 types to the same object have the same POINTER_TYPE node. Code in the
481 equivalent function of c-decl.c makes a copy of the type node here, but
482 that may cause us trouble with incomplete types. We make an exception
483 for fat pointer types because the compiler automatically builds them
484 for unconstrained array types and the debugger uses them to represent
485 both these and pointers to these. */
486 if (TREE_CODE (decl) == TYPE_DECL && DECL_NAME (decl))
488 tree t = TREE_TYPE (decl);
490 if (!(TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL))
492 else if (TYPE_FAT_POINTER_P (t))
494 tree tt = build_variant_type_copy (t);
495 TYPE_NAME (tt) = decl;
496 TREE_USED (tt) = TREE_USED (t);
497 TREE_TYPE (decl) = tt;
498 DECL_ORIGINAL_TYPE (decl) = t;
501 else if (DECL_ARTIFICIAL (TYPE_NAME (t)) && !DECL_ARTIFICIAL (decl))
506 /* Propagate the name to all the variants. This is needed for
507 the type qualifiers machinery to work properly. */
509 for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t))
510 TYPE_NAME (t) = decl;
514 /* Do little here. Set up the standard declarations later after the
515 front end has been run. */
518 gnat_init_decl_processing (void)
520 /* Make the binding_level structure for global names. */
521 current_function_decl = 0;
522 current_binding_level = 0;
523 free_binding_level = 0;
526 build_common_tree_nodes (true, true);
528 /* In Ada, we use a signed type for SIZETYPE. Use the signed type
529 corresponding to the width of Pmode. In most cases when ptr_mode
530 and Pmode differ, C will use the width of ptr_mode for SIZETYPE.
531 But we get far better code using the width of Pmode. */
532 size_type_node = gnat_type_for_mode (Pmode, 0);
533 set_sizetype (size_type_node);
535 /* In Ada, we use an unsigned 8-bit type for the default boolean type. */
536 boolean_type_node = make_unsigned_type (8);
537 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
538 SET_TYPE_RM_MAX_VALUE (boolean_type_node,
539 build_int_cst (boolean_type_node, 1));
540 SET_TYPE_RM_SIZE (boolean_type_node, bitsize_int (1));
542 build_common_tree_nodes_2 (0);
543 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);
545 ptr_void_type_node = build_pointer_type (void_type_node);
548 /* Record TYPE as a builtin type for Ada. NAME is the name of the type. */
551 record_builtin_type (const char *name, tree type)
553 tree type_decl = build_decl (input_location,
554 TYPE_DECL, get_identifier (name), type);
556 gnat_pushdecl (type_decl, Empty);
558 if (debug_hooks->type_decl)
559 debug_hooks->type_decl (type_decl, false);
562 /* Given a record type RECORD_TYPE and a chain of FIELD_DECL nodes FIELDLIST,
563 finish constructing the record or union type. If REP_LEVEL is zero, this
564 record has no representation clause and so will be entirely laid out here.
565 If REP_LEVEL is one, this record has a representation clause and has been
566 laid out already; only set the sizes and alignment. If REP_LEVEL is two,
567 this record is derived from a parent record and thus inherits its layout;
568 only make a pass on the fields to finalize them. If DO_NOT_FINALIZE is
569 true, the record type is expected to be modified afterwards so it will
570 not be sent to the back-end for finalization. */
573 finish_record_type (tree record_type, tree fieldlist, int rep_level,
574 bool do_not_finalize)
576 enum tree_code code = TREE_CODE (record_type);
577 tree name = TYPE_NAME (record_type);
578 tree ada_size = bitsize_zero_node;
579 tree size = bitsize_zero_node;
580 bool had_size = TYPE_SIZE (record_type) != 0;
581 bool had_size_unit = TYPE_SIZE_UNIT (record_type) != 0;
582 bool had_align = TYPE_ALIGN (record_type) != 0;
585 TYPE_FIELDS (record_type) = fieldlist;
587 /* Always attach the TYPE_STUB_DECL for a record type. It is required to
588 generate debug info and have a parallel type. */
589 if (name && TREE_CODE (name) == TYPE_DECL)
590 name = DECL_NAME (name);
591 TYPE_STUB_DECL (record_type) = create_type_stub_decl (name, record_type);
593 /* Globally initialize the record first. If this is a rep'ed record,
594 that just means some initializations; otherwise, layout the record. */
597 TYPE_ALIGN (record_type) = MAX (BITS_PER_UNIT, TYPE_ALIGN (record_type));
598 SET_TYPE_MODE (record_type, BLKmode);
601 TYPE_SIZE_UNIT (record_type) = size_zero_node;
603 TYPE_SIZE (record_type) = bitsize_zero_node;
605 /* For all-repped records with a size specified, lay the QUAL_UNION_TYPE
606 out just like a UNION_TYPE, since the size will be fixed. */
607 else if (code == QUAL_UNION_TYPE)
612 /* Ensure there isn't a size already set. There can be in an error
613 case where there is a rep clause but all fields have errors and
614 no longer have a position. */
615 TYPE_SIZE (record_type) = 0;
616 layout_type (record_type);
619 /* At this point, the position and size of each field is known. It was
620 either set before entry by a rep clause, or by laying out the type above.
622 We now run a pass over the fields (in reverse order for QUAL_UNION_TYPEs)
623 to compute the Ada size; the GCC size and alignment (for rep'ed records
624 that are not padding types); and the mode (for rep'ed records). We also
625 clear the DECL_BIT_FIELD indication for the cases we know have not been
626 handled yet, and adjust DECL_NONADDRESSABLE_P accordingly. */
628 if (code == QUAL_UNION_TYPE)
629 fieldlist = nreverse (fieldlist);
631 for (field = fieldlist; field; field = TREE_CHAIN (field))
633 tree type = TREE_TYPE (field);
634 tree pos = bit_position (field);
635 tree this_size = DECL_SIZE (field);
638 if ((TREE_CODE (type) == RECORD_TYPE
639 || TREE_CODE (type) == UNION_TYPE
640 || TREE_CODE (type) == QUAL_UNION_TYPE)
641 && !TYPE_IS_FAT_POINTER_P (type)
642 && !TYPE_CONTAINS_TEMPLATE_P (type)
643 && TYPE_ADA_SIZE (type))
644 this_ada_size = TYPE_ADA_SIZE (type);
646 this_ada_size = this_size;
648 /* Clear DECL_BIT_FIELD for the cases layout_decl does not handle. */
649 if (DECL_BIT_FIELD (field)
650 && operand_equal_p (this_size, TYPE_SIZE (type), 0))
652 unsigned int align = TYPE_ALIGN (type);
654 /* In the general case, type alignment is required. */
655 if (value_factor_p (pos, align))
657 /* The enclosing record type must be sufficiently aligned.
658 Otherwise, if no alignment was specified for it and it
659 has been laid out already, bump its alignment to the
660 desired one if this is compatible with its size. */
661 if (TYPE_ALIGN (record_type) >= align)
663 DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align);
664 DECL_BIT_FIELD (field) = 0;
668 && value_factor_p (TYPE_SIZE (record_type), align))
670 TYPE_ALIGN (record_type) = align;
671 DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align);
672 DECL_BIT_FIELD (field) = 0;
676 /* In the non-strict alignment case, only byte alignment is. */
677 if (!STRICT_ALIGNMENT
678 && DECL_BIT_FIELD (field)
679 && value_factor_p (pos, BITS_PER_UNIT))
680 DECL_BIT_FIELD (field) = 0;
683 /* If we still have DECL_BIT_FIELD set at this point, we know that the
684 field is technically not addressable. Except that it can actually
685 be addressed if it is BLKmode and happens to be properly aligned. */
686 if (DECL_BIT_FIELD (field)
687 && !(DECL_MODE (field) == BLKmode
688 && value_factor_p (pos, BITS_PER_UNIT)))
689 DECL_NONADDRESSABLE_P (field) = 1;
691 /* A type must be as aligned as its most aligned field that is not
692 a bit-field. But this is already enforced by layout_type. */
693 if (rep_level > 0 && !DECL_BIT_FIELD (field))
694 TYPE_ALIGN (record_type)
695 = MAX (TYPE_ALIGN (record_type), DECL_ALIGN (field));
700 ada_size = size_binop (MAX_EXPR, ada_size, this_ada_size);
701 size = size_binop (MAX_EXPR, size, this_size);
704 case QUAL_UNION_TYPE:
706 = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field),
707 this_ada_size, ada_size);
708 size = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field),
713 /* Since we know here that all fields are sorted in order of
714 increasing bit position, the size of the record is one
715 higher than the ending bit of the last field processed
716 unless we have a rep clause, since in that case we might
717 have a field outside a QUAL_UNION_TYPE that has a higher ending
718 position. So use a MAX in that case. Also, if this field is a
719 QUAL_UNION_TYPE, we need to take into account the previous size in
720 the case of empty variants. */
722 = merge_sizes (ada_size, pos, this_ada_size,
723 TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0);
725 = merge_sizes (size, pos, this_size,
726 TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0);
734 if (code == QUAL_UNION_TYPE)
735 nreverse (fieldlist);
737 /* If the type is discriminated, it can be used to access all its
738 constrained subtypes, so force structural equality checks. */
739 if (CONTAINS_PLACEHOLDER_P (size))
740 SET_TYPE_STRUCTURAL_EQUALITY (record_type);
744 /* If this is a padding record, we never want to make the size smaller
745 than what was specified in it, if any. */
746 if (TREE_CODE (record_type) == RECORD_TYPE
747 && TYPE_IS_PADDING_P (record_type) && TYPE_SIZE (record_type))
748 size = TYPE_SIZE (record_type);
750 /* Now set any of the values we've just computed that apply. */
751 if (!TYPE_IS_FAT_POINTER_P (record_type)
752 && !TYPE_CONTAINS_TEMPLATE_P (record_type))
753 SET_TYPE_ADA_SIZE (record_type, ada_size);
757 tree size_unit = had_size_unit
758 ? TYPE_SIZE_UNIT (record_type)
760 size_binop (CEIL_DIV_EXPR, size,
762 unsigned int align = TYPE_ALIGN (record_type);
764 TYPE_SIZE (record_type) = variable_size (round_up (size, align));
765 TYPE_SIZE_UNIT (record_type)
766 = variable_size (round_up (size_unit, align / BITS_PER_UNIT));
768 compute_record_mode (record_type);
772 if (!do_not_finalize)
773 rest_of_record_type_compilation (record_type);
776 /* Wrap up compilation of RECORD_TYPE, i.e. most notably output all
777 the debug information associated with it. It need not be invoked
778 directly in most cases since finish_record_type takes care of doing
779 so, unless explicitly requested not to through DO_NOT_FINALIZE. */
782 rest_of_record_type_compilation (tree record_type)
784 tree fieldlist = TYPE_FIELDS (record_type);
786 enum tree_code code = TREE_CODE (record_type);
787 bool var_size = false;
789 for (field = fieldlist; field; field = TREE_CHAIN (field))
791 /* We need to make an XVE/XVU record if any field has variable size,
792 whether or not the record does. For example, if we have a union,
793 it may be that all fields, rounded up to the alignment, have the
794 same size, in which case we'll use that size. But the debug
795 output routines (except Dwarf2) won't be able to output the fields,
796 so we need to make the special record. */
797 if (TREE_CODE (DECL_SIZE (field)) != INTEGER_CST
798 /* If a field has a non-constant qualifier, the record will have
799 variable size too. */
800 || (code == QUAL_UNION_TYPE
801 && TREE_CODE (DECL_QUALIFIER (field)) != INTEGER_CST))
808 /* If this record is of variable size, rename it so that the
809 debugger knows it is and make a new, parallel, record
810 that tells the debugger how the record is laid out. See
811 exp_dbug.ads. But don't do this for records that are padding
812 since they confuse GDB. */
814 && !(TREE_CODE (record_type) == RECORD_TYPE
815 && TYPE_IS_PADDING_P (record_type)))
818 = make_node (TREE_CODE (record_type) == QUAL_UNION_TYPE
819 ? UNION_TYPE : TREE_CODE (record_type));
820 tree orig_name = TYPE_NAME (record_type), new_name;
821 tree last_pos = bitsize_zero_node;
822 tree old_field, prev_old_field = NULL_TREE;
824 if (TREE_CODE (orig_name) == TYPE_DECL)
825 orig_name = DECL_NAME (orig_name);
828 = concat_name (orig_name, TREE_CODE (record_type) == QUAL_UNION_TYPE
830 TYPE_NAME (new_record_type) = new_name;
831 TYPE_ALIGN (new_record_type) = BIGGEST_ALIGNMENT;
832 TYPE_STUB_DECL (new_record_type)
833 = create_type_stub_decl (new_name, new_record_type);
834 DECL_IGNORED_P (TYPE_STUB_DECL (new_record_type))
835 = DECL_IGNORED_P (TYPE_STUB_DECL (record_type));
836 TYPE_SIZE (new_record_type) = size_int (TYPE_ALIGN (record_type));
837 TYPE_SIZE_UNIT (new_record_type)
838 = size_int (TYPE_ALIGN (record_type) / BITS_PER_UNIT);
840 add_parallel_type (TYPE_STUB_DECL (record_type), new_record_type);
842 /* Now scan all the fields, replacing each field with a new
843 field corresponding to the new encoding. */
844 for (old_field = TYPE_FIELDS (record_type); old_field;
845 old_field = TREE_CHAIN (old_field))
847 tree field_type = TREE_TYPE (old_field);
848 tree field_name = DECL_NAME (old_field);
850 tree curpos = bit_position (old_field);
852 unsigned int align = 0;
855 /* See how the position was modified from the last position.
857 There are two basic cases we support: a value was added
858 to the last position or the last position was rounded to
859 a boundary and they something was added. Check for the
860 first case first. If not, see if there is any evidence
861 of rounding. If so, round the last position and try
864 If this is a union, the position can be taken as zero. */
866 /* Some computations depend on the shape of the position expression,
867 so strip conversions to make sure it's exposed. */
868 curpos = remove_conversions (curpos, true);
870 if (TREE_CODE (new_record_type) == UNION_TYPE)
871 pos = bitsize_zero_node, align = 0;
873 pos = compute_related_constant (curpos, last_pos);
875 if (!pos && TREE_CODE (curpos) == MULT_EXPR
876 && host_integerp (TREE_OPERAND (curpos, 1), 1))
878 tree offset = TREE_OPERAND (curpos, 0);
879 align = tree_low_cst (TREE_OPERAND (curpos, 1), 1);
881 /* An offset which is a bitwise AND with a negative power of 2
882 means an alignment corresponding to this power of 2. */
883 offset = remove_conversions (offset, true);
884 if (TREE_CODE (offset) == BIT_AND_EXPR
885 && host_integerp (TREE_OPERAND (offset, 1), 0)
886 && tree_int_cst_sgn (TREE_OPERAND (offset, 1)) < 0)
889 = - tree_low_cst (TREE_OPERAND (offset, 1), 0);
890 if (exact_log2 (pow) > 0)
894 pos = compute_related_constant (curpos,
895 round_up (last_pos, align));
897 else if (!pos && TREE_CODE (curpos) == PLUS_EXPR
898 && TREE_CODE (TREE_OPERAND (curpos, 1)) == INTEGER_CST
899 && TREE_CODE (TREE_OPERAND (curpos, 0)) == MULT_EXPR
900 && host_integerp (TREE_OPERAND
901 (TREE_OPERAND (curpos, 0), 1),
906 (TREE_OPERAND (TREE_OPERAND (curpos, 0), 1), 1);
907 pos = compute_related_constant (curpos,
908 round_up (last_pos, align));
910 else if (potential_alignment_gap (prev_old_field, old_field,
913 align = TYPE_ALIGN (field_type);
914 pos = compute_related_constant (curpos,
915 round_up (last_pos, align));
918 /* If we can't compute a position, set it to zero.
920 ??? We really should abort here, but it's too much work
921 to get this correct for all cases. */
924 pos = bitsize_zero_node;
926 /* See if this type is variable-sized and make a pointer type
927 and indicate the indirection if so. Beware that the debug
928 back-end may adjust the position computed above according
929 to the alignment of the field type, i.e. the pointer type
930 in this case, if we don't preventively counter that. */
931 if (TREE_CODE (DECL_SIZE (old_field)) != INTEGER_CST)
933 field_type = build_pointer_type (field_type);
934 if (align != 0 && TYPE_ALIGN (field_type) > align)
936 field_type = copy_node (field_type);
937 TYPE_ALIGN (field_type) = align;
942 /* Make a new field name, if necessary. */
943 if (var || align != 0)
948 sprintf (suffix, "XV%c%u", var ? 'L' : 'A',
949 align / BITS_PER_UNIT);
951 strcpy (suffix, "XVL");
953 field_name = concat_name (field_name, suffix);
956 new_field = create_field_decl (field_name, field_type,
958 DECL_SIZE (old_field), pos, 0);
959 TREE_CHAIN (new_field) = TYPE_FIELDS (new_record_type);
960 TYPE_FIELDS (new_record_type) = new_field;
962 /* If old_field is a QUAL_UNION_TYPE, take its size as being
963 zero. The only time it's not the last field of the record
964 is when there are other components at fixed positions after
965 it (meaning there was a rep clause for every field) and we
966 want to be able to encode them. */
967 last_pos = size_binop (PLUS_EXPR, bit_position (old_field),
968 (TREE_CODE (TREE_TYPE (old_field))
971 : DECL_SIZE (old_field));
972 prev_old_field = old_field;
975 TYPE_FIELDS (new_record_type)
976 = nreverse (TYPE_FIELDS (new_record_type));
978 rest_of_type_decl_compilation (TYPE_STUB_DECL (new_record_type));
981 rest_of_type_decl_compilation (TYPE_STUB_DECL (record_type));
984 /* Append PARALLEL_TYPE on the chain of parallel types for decl. */
987 add_parallel_type (tree decl, tree parallel_type)
991 while (DECL_PARALLEL_TYPE (d))
992 d = TYPE_STUB_DECL (DECL_PARALLEL_TYPE (d));
994 SET_DECL_PARALLEL_TYPE (d, parallel_type);
997 /* Return the parallel type associated to a type, if any. */
1000 get_parallel_type (tree type)
1002 if (TYPE_STUB_DECL (type))
1003 return DECL_PARALLEL_TYPE (TYPE_STUB_DECL (type));
1008 /* Utility function of above to merge LAST_SIZE, the previous size of a record
1009 with FIRST_BIT and SIZE that describe a field. SPECIAL is true if this
1010 represents a QUAL_UNION_TYPE in which case we must look for COND_EXPRs and
1011 replace a value of zero with the old size. If HAS_REP is true, we take the
1012 MAX of the end position of this field with LAST_SIZE. In all other cases,
1013 we use FIRST_BIT plus SIZE. Return an expression for the size. */
1016 merge_sizes (tree last_size, tree first_bit, tree size, bool special,
1019 tree type = TREE_TYPE (last_size);
1022 if (!special || TREE_CODE (size) != COND_EXPR)
1024 new_size = size_binop (PLUS_EXPR, first_bit, size);
1026 new_size = size_binop (MAX_EXPR, last_size, new_size);
1030 new_size = fold_build3 (COND_EXPR, type, TREE_OPERAND (size, 0),
1031 integer_zerop (TREE_OPERAND (size, 1))
1032 ? last_size : merge_sizes (last_size, first_bit,
1033 TREE_OPERAND (size, 1),
1035 integer_zerop (TREE_OPERAND (size, 2))
1036 ? last_size : merge_sizes (last_size, first_bit,
1037 TREE_OPERAND (size, 2),
1040 /* We don't need any NON_VALUE_EXPRs and they can confuse us (especially
1041 when fed through substitute_in_expr) into thinking that a constant
1042 size is not constant. */
1043 while (TREE_CODE (new_size) == NON_LVALUE_EXPR)
1044 new_size = TREE_OPERAND (new_size, 0);
1049 /* Utility function of above to see if OP0 and OP1, both of SIZETYPE, are
1050 related by the addition of a constant. Return that constant if so. */
1053 compute_related_constant (tree op0, tree op1)
1055 tree op0_var, op1_var;
1056 tree op0_con = split_plus (op0, &op0_var);
1057 tree op1_con = split_plus (op1, &op1_var);
1058 tree result = size_binop (MINUS_EXPR, op0_con, op1_con);
1060 if (operand_equal_p (op0_var, op1_var, 0))
1062 else if (operand_equal_p (op0, size_binop (PLUS_EXPR, op1_var, result), 0))
1068 /* Utility function of above to split a tree OP which may be a sum, into a
1069 constant part, which is returned, and a variable part, which is stored
1070 in *PVAR. *PVAR may be bitsize_zero_node. All operations must be of
1074 split_plus (tree in, tree *pvar)
1076 /* Strip NOPS in order to ease the tree traversal and maximize the
1077 potential for constant or plus/minus discovery. We need to be careful
1078 to always return and set *pvar to bitsizetype trees, but it's worth
1082 *pvar = convert (bitsizetype, in);
1084 if (TREE_CODE (in) == INTEGER_CST)
1086 *pvar = bitsize_zero_node;
1087 return convert (bitsizetype, in);
1089 else if (TREE_CODE (in) == PLUS_EXPR || TREE_CODE (in) == MINUS_EXPR)
1091 tree lhs_var, rhs_var;
1092 tree lhs_con = split_plus (TREE_OPERAND (in, 0), &lhs_var);
1093 tree rhs_con = split_plus (TREE_OPERAND (in, 1), &rhs_var);
1095 if (lhs_var == TREE_OPERAND (in, 0)
1096 && rhs_var == TREE_OPERAND (in, 1))
1097 return bitsize_zero_node;
1099 *pvar = size_binop (TREE_CODE (in), lhs_var, rhs_var);
1100 return size_binop (TREE_CODE (in), lhs_con, rhs_con);
1103 return bitsize_zero_node;
1106 /* Return a FUNCTION_TYPE node. RETURN_TYPE is the type returned by the
1107 subprogram. If it is void_type_node, then we are dealing with a procedure,
1108 otherwise we are dealing with a function. PARAM_DECL_LIST is a list of
1109 PARM_DECL nodes that are the subprogram arguments. CICO_LIST is the
1110 copy-in/copy-out list to be stored into TYPE_CICO_LIST.
1111 RETURNS_UNCONSTRAINED is true if the function returns an unconstrained
1112 object. RETURNS_BY_REF is true if the function returns by reference.
1113 RETURNS_BY_TARGET_PTR is true if the function is to be passed (as its
1114 first parameter) the address of the place to copy its result. */
1117 create_subprog_type (tree return_type, tree param_decl_list, tree cico_list,
1118 bool returns_unconstrained, bool returns_by_ref,
1119 bool returns_by_target_ptr)
1121 /* A chain of TREE_LIST nodes whose TREE_VALUEs are the data type nodes of
1122 the subprogram formal parameters. This list is generated by traversing the
1123 input list of PARM_DECL nodes. */
1124 tree param_type_list = NULL;
1128 for (param_decl = param_decl_list; param_decl;
1129 param_decl = TREE_CHAIN (param_decl))
1130 param_type_list = tree_cons (NULL_TREE, TREE_TYPE (param_decl),
1133 /* The list of the function parameter types has to be terminated by the void
1134 type to signal to the back-end that we are not dealing with a variable
1135 parameter subprogram, but that the subprogram has a fixed number of
1137 param_type_list = tree_cons (NULL_TREE, void_type_node, param_type_list);
1139 /* The list of argument types has been created in reverse
1141 param_type_list = nreverse (param_type_list);
1143 type = build_function_type (return_type, param_type_list);
1145 /* TYPE may have been shared since GCC hashes types. If it has a CICO_LIST
1146 or the new type should, make a copy of TYPE. Likewise for
1147 RETURNS_UNCONSTRAINED and RETURNS_BY_REF. */
1148 if (TYPE_CI_CO_LIST (type) || cico_list
1149 || TYPE_RETURNS_UNCONSTRAINED_P (type) != returns_unconstrained
1150 || TYPE_RETURNS_BY_REF_P (type) != returns_by_ref
1151 || TYPE_RETURNS_BY_TARGET_PTR_P (type) != returns_by_target_ptr)
1152 type = copy_type (type);
1154 TYPE_CI_CO_LIST (type) = cico_list;
1155 TYPE_RETURNS_UNCONSTRAINED_P (type) = returns_unconstrained;
1156 TYPE_RETURNS_BY_REF_P (type) = returns_by_ref;
1157 TYPE_RETURNS_BY_TARGET_PTR_P (type) = returns_by_target_ptr;
1161 /* Return a copy of TYPE but safe to modify in any way. */
1164 copy_type (tree type)
1166 tree new_type = copy_node (type);
1168 /* copy_node clears this field instead of copying it, because it is
1169 aliased with TREE_CHAIN. */
1170 TYPE_STUB_DECL (new_type) = TYPE_STUB_DECL (type);
1172 TYPE_POINTER_TO (new_type) = 0;
1173 TYPE_REFERENCE_TO (new_type) = 0;
1174 TYPE_MAIN_VARIANT (new_type) = new_type;
1175 TYPE_NEXT_VARIANT (new_type) = 0;
1180 /* Return a subtype of sizetype with range MIN to MAX and whose
1181 TYPE_INDEX_TYPE is INDEX. GNAT_NODE is used for the position
1182 of the associated TYPE_DECL. */
1185 create_index_type (tree min, tree max, tree index, Node_Id gnat_node)
1187 /* First build a type for the desired range. */
1188 tree type = build_index_2_type (min, max);
1190 /* If this type has the TYPE_INDEX_TYPE we want, return it. */
1191 if (TYPE_INDEX_TYPE (type) == index)
1194 /* Otherwise, if TYPE_INDEX_TYPE is set, make a copy. Note that we have
1195 no way of sharing these types, but that's only a small hole. */
1196 if (TYPE_INDEX_TYPE (type))
1197 type = copy_type (type);
1199 SET_TYPE_INDEX_TYPE (type, index);
1200 create_type_decl (NULL_TREE, type, NULL, true, false, gnat_node);
1205 /* Return a subtype of TYPE with range MIN to MAX. If TYPE is NULL,
1206 sizetype is used. */
1209 create_range_type (tree type, tree min, tree max)
1213 if (type == NULL_TREE)
1216 /* First build a type with the base range. */
1218 = build_range_type (type, TYPE_MIN_VALUE (type), TYPE_MAX_VALUE (type));
1220 min = convert (type, min);
1221 max = convert (type, max);
1223 /* If this type has the TYPE_RM_{MIN,MAX}_VALUE we want, return it. */
1224 if (TYPE_RM_MIN_VALUE (range_type)
1225 && TYPE_RM_MAX_VALUE (range_type)
1226 && operand_equal_p (TYPE_RM_MIN_VALUE (range_type), min, 0)
1227 && operand_equal_p (TYPE_RM_MAX_VALUE (range_type), max, 0))
1230 /* Otherwise, if TYPE_RM_{MIN,MAX}_VALUE is set, make a copy. */
1231 if (TYPE_RM_MIN_VALUE (range_type) || TYPE_RM_MAX_VALUE (range_type))
1232 range_type = copy_type (range_type);
1234 /* Then set the actual range. */
1235 SET_TYPE_RM_MIN_VALUE (range_type, min);
1236 SET_TYPE_RM_MAX_VALUE (range_type, max);
1241 /* Return a TYPE_DECL node suitable for the TYPE_STUB_DECL field of a type.
1242 TYPE_NAME gives the name of the type and TYPE is a ..._TYPE node giving
1246 create_type_stub_decl (tree type_name, tree type)
1248 /* Using a named TYPE_DECL ensures that a type name marker is emitted in
1249 STABS while setting DECL_ARTIFICIAL ensures that no DW_TAG_typedef is
1250 emitted in DWARF. */
1251 tree type_decl = build_decl (input_location,
1252 TYPE_DECL, type_name, type);
1253 DECL_ARTIFICIAL (type_decl) = 1;
1257 /* Return a TYPE_DECL node. TYPE_NAME gives the name of the type and TYPE
1258 is a ..._TYPE node giving its data type. ARTIFICIAL_P is true if this
1259 is a declaration that was generated by the compiler. DEBUG_INFO_P is
1260 true if we need to write debug information about this type. GNAT_NODE
1261 is used for the position of the decl. */
1264 create_type_decl (tree type_name, tree type, struct attrib *attr_list,
1265 bool artificial_p, bool debug_info_p, Node_Id gnat_node)
1267 enum tree_code code = TREE_CODE (type);
1268 bool named = TYPE_NAME (type) && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL;
1271 /* Only the builtin TYPE_STUB_DECL should be used for dummy types. */
1272 gcc_assert (!TYPE_IS_DUMMY_P (type));
1274 /* If the type hasn't been named yet, we're naming it; preserve an existing
1275 TYPE_STUB_DECL that has been attached to it for some purpose. */
1276 if (!named && TYPE_STUB_DECL (type))
1278 type_decl = TYPE_STUB_DECL (type);
1279 DECL_NAME (type_decl) = type_name;
1282 type_decl = build_decl (input_location,
1283 TYPE_DECL, type_name, type);
1285 DECL_ARTIFICIAL (type_decl) = artificial_p;
1286 gnat_pushdecl (type_decl, gnat_node);
1287 process_attributes (type_decl, attr_list);
1289 /* If we're naming the type, equate the TYPE_STUB_DECL to the name.
1290 This causes the name to be also viewed as a "tag" by the debug
1291 back-end, with the advantage that no DW_TAG_typedef is emitted
1292 for artificial "tagged" types in DWARF. */
1294 TYPE_STUB_DECL (type) = type_decl;
1296 /* Pass the type declaration to the debug back-end unless this is an
1297 UNCONSTRAINED_ARRAY_TYPE that the back-end does not support, or a
1298 type for which debugging information was not requested, or else an
1299 ENUMERAL_TYPE or RECORD_TYPE (except for fat pointers) which are
1300 handled separately. And do not pass dummy types either. */
1301 if (code == UNCONSTRAINED_ARRAY_TYPE || !debug_info_p)
1302 DECL_IGNORED_P (type_decl) = 1;
1303 else if (code != ENUMERAL_TYPE
1304 && (code != RECORD_TYPE || TYPE_IS_FAT_POINTER_P (type))
1305 && !((code == POINTER_TYPE || code == REFERENCE_TYPE)
1306 && TYPE_IS_DUMMY_P (TREE_TYPE (type)))
1307 && !(code == RECORD_TYPE
1309 (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (type))))))
1310 rest_of_type_decl_compilation (type_decl);
1315 /* Return a VAR_DECL or CONST_DECL node.
1317 VAR_NAME gives the name of the variable. ASM_NAME is its assembler name
1318 (if provided). TYPE is its data type (a GCC ..._TYPE node). VAR_INIT is
1319 the GCC tree for an optional initial expression; NULL_TREE if none.
1321 CONST_FLAG is true if this variable is constant, in which case we might
1322 return a CONST_DECL node unless CONST_DECL_ALLOWED_P is false.
1324 PUBLIC_FLAG is true if this is for a reference to a public entity or for a
1325 definition to be made visible outside of the current compilation unit, for
1326 instance variable definitions in a package specification.
1328 EXTERN_FLAG is true when processing an external variable declaration (as
1329 opposed to a definition: no storage is to be allocated for the variable).
1331 STATIC_FLAG is only relevant when not at top level. In that case
1332 it indicates whether to always allocate storage to the variable.
1334 GNAT_NODE is used for the position of the decl. */
1337 create_var_decl_1 (tree var_name, tree asm_name, tree type, tree var_init,
1338 bool const_flag, bool public_flag, bool extern_flag,
1339 bool static_flag, bool const_decl_allowed_p,
1340 struct attrib *attr_list, Node_Id gnat_node)
1344 && gnat_types_compatible_p (type, TREE_TYPE (var_init))
1345 && (global_bindings_p () || static_flag
1346 ? initializer_constant_valid_p (var_init, TREE_TYPE (var_init)) != 0
1347 : TREE_CONSTANT (var_init)));
1349 /* Whether we will make TREE_CONSTANT the DECL we produce here, in which
1350 case the initializer may be used in-lieu of the DECL node (as done in
1351 Identifier_to_gnu). This is useful to prevent the need of elaboration
1352 code when an identifier for which such a decl is made is in turn used as
1353 an initializer. We used to rely on CONST vs VAR_DECL for this purpose,
1354 but extra constraints apply to this choice (see below) and are not
1355 relevant to the distinction we wish to make. */
1356 bool constant_p = const_flag && init_const;
1358 /* The actual DECL node. CONST_DECL was initially intended for enumerals
1359 and may be used for scalars in general but not for aggregates. */
1361 = build_decl (input_location,
1362 (constant_p && const_decl_allowed_p
1363 && !AGGREGATE_TYPE_P (type)) ? CONST_DECL : VAR_DECL,
1366 /* If this is external, throw away any initializations (they will be done
1367 elsewhere) unless this is a constant for which we would like to remain
1368 able to get the initializer. If we are defining a global here, leave a
1369 constant initialization and save any variable elaborations for the
1370 elaboration routine. If we are just annotating types, throw away the
1371 initialization if it isn't a constant. */
1372 if ((extern_flag && !constant_p)
1373 || (type_annotate_only && var_init && !TREE_CONSTANT (var_init)))
1374 var_init = NULL_TREE;
1376 /* At the global level, an initializer requiring code to be generated
1377 produces elaboration statements. Check that such statements are allowed,
1378 that is, not violating a No_Elaboration_Code restriction. */
1379 if (global_bindings_p () && var_init != 0 && ! init_const)
1380 Check_Elaboration_Code_Allowed (gnat_node);
1382 /* Ada doesn't feature Fortran-like COMMON variables so we shouldn't
1383 try to fiddle with DECL_COMMON. However, on platforms that don't
1384 support global BSS sections, uninitialized global variables would
1385 go in DATA instead, thus increasing the size of the executable. */
1387 && TREE_CODE (var_decl) == VAR_DECL
1388 && !have_global_bss_p ())
1389 DECL_COMMON (var_decl) = 1;
1390 DECL_INITIAL (var_decl) = var_init;
1391 TREE_READONLY (var_decl) = const_flag;
1392 DECL_EXTERNAL (var_decl) = extern_flag;
1393 TREE_PUBLIC (var_decl) = public_flag || extern_flag;
1394 TREE_CONSTANT (var_decl) = constant_p;
1395 TREE_THIS_VOLATILE (var_decl) = TREE_SIDE_EFFECTS (var_decl)
1396 = TYPE_VOLATILE (type);
1398 /* If it's public and not external, always allocate storage for it.
1399 At the global binding level we need to allocate static storage for the
1400 variable if and only if it's not external. If we are not at the top level
1401 we allocate automatic storage unless requested not to. */
1402 TREE_STATIC (var_decl)
1403 = !extern_flag && (public_flag || static_flag || global_bindings_p ());
1405 /* For an external constant whose initializer is not absolute, do not emit
1406 debug info. In DWARF this would mean a global relocation in a read-only
1407 section which runs afoul of the PE-COFF runtime relocation mechanism. */
1410 && initializer_constant_valid_p (var_init, TREE_TYPE (var_init))
1411 != null_pointer_node)
1412 DECL_IGNORED_P (var_decl) = 1;
1414 if (asm_name && VAR_OR_FUNCTION_DECL_P (var_decl))
1415 SET_DECL_ASSEMBLER_NAME (var_decl, asm_name);
1417 process_attributes (var_decl, attr_list);
1419 /* Add this decl to the current binding level. */
1420 gnat_pushdecl (var_decl, gnat_node);
1422 if (TREE_SIDE_EFFECTS (var_decl))
1423 TREE_ADDRESSABLE (var_decl) = 1;
1425 if (TREE_CODE (var_decl) != CONST_DECL)
1427 if (global_bindings_p ())
1428 rest_of_decl_compilation (var_decl, true, 0);
1431 expand_decl (var_decl);
1436 /* Return true if TYPE, an aggregate type, contains (or is) an array. */
1439 aggregate_type_contains_array_p (tree type)
1441 switch (TREE_CODE (type))
1445 case QUAL_UNION_TYPE:
1448 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1449 if (AGGREGATE_TYPE_P (TREE_TYPE (field))
1450 && aggregate_type_contains_array_p (TREE_TYPE (field)))
1463 /* Return a FIELD_DECL node. FIELD_NAME the field name, FIELD_TYPE is its
1464 type, and RECORD_TYPE is the type of the parent. PACKED is nonzero if
1465 this field is in a record type with a "pragma pack". If SIZE is nonzero
1466 it is the specified size for this field. If POS is nonzero, it is the bit
1467 position. If ADDRESSABLE is nonzero, it means we are allowed to take
1468 the address of this field for aliasing purposes. If it is negative, we
1469 should not make a bitfield, which is used by make_aligning_type. */
1472 create_field_decl (tree field_name, tree field_type, tree record_type,
1473 int packed, tree size, tree pos, int addressable)
1475 tree field_decl = build_decl (input_location,
1476 FIELD_DECL, field_name, field_type);
1478 DECL_CONTEXT (field_decl) = record_type;
1479 TREE_READONLY (field_decl) = TYPE_READONLY (field_type);
1481 /* If FIELD_TYPE is BLKmode, we must ensure this is aligned to at least a
1482 byte boundary since GCC cannot handle less-aligned BLKmode bitfields.
1483 Likewise for an aggregate without specified position that contains an
1484 array, because in this case slices of variable length of this array
1485 must be handled by GCC and variable-sized objects need to be aligned
1486 to at least a byte boundary. */
1487 if (packed && (TYPE_MODE (field_type) == BLKmode
1489 && AGGREGATE_TYPE_P (field_type)
1490 && aggregate_type_contains_array_p (field_type))))
1491 DECL_ALIGN (field_decl) = BITS_PER_UNIT;
1493 /* If a size is specified, use it. Otherwise, if the record type is packed
1494 compute a size to use, which may differ from the object's natural size.
1495 We always set a size in this case to trigger the checks for bitfield
1496 creation below, which is typically required when no position has been
1499 size = convert (bitsizetype, size);
1500 else if (packed == 1)
1502 size = rm_size (field_type);
1504 /* For a constant size larger than MAX_FIXED_MODE_SIZE, round up to
1506 if (TREE_CODE (size) == INTEGER_CST
1507 && compare_tree_int (size, MAX_FIXED_MODE_SIZE) > 0)
1508 size = round_up (size, BITS_PER_UNIT);
1511 /* If we may, according to ADDRESSABLE, make a bitfield if a size is
1512 specified for two reasons: first if the size differs from the natural
1513 size. Second, if the alignment is insufficient. There are a number of
1514 ways the latter can be true.
1516 We never make a bitfield if the type of the field has a nonconstant size,
1517 because no such entity requiring bitfield operations should reach here.
1519 We do *preventively* make a bitfield when there might be the need for it
1520 but we don't have all the necessary information to decide, as is the case
1521 of a field with no specified position in a packed record.
1523 We also don't look at STRICT_ALIGNMENT here, and rely on later processing
1524 in layout_decl or finish_record_type to clear the bit_field indication if
1525 it is in fact not needed. */
1526 if (addressable >= 0
1528 && TREE_CODE (size) == INTEGER_CST
1529 && TREE_CODE (TYPE_SIZE (field_type)) == INTEGER_CST
1530 && (!tree_int_cst_equal (size, TYPE_SIZE (field_type))
1531 || (pos && !value_factor_p (pos, TYPE_ALIGN (field_type)))
1533 || (TYPE_ALIGN (record_type) != 0
1534 && TYPE_ALIGN (record_type) < TYPE_ALIGN (field_type))))
1536 DECL_BIT_FIELD (field_decl) = 1;
1537 DECL_SIZE (field_decl) = size;
1538 if (!packed && !pos)
1540 if (TYPE_ALIGN (record_type) != 0
1541 && TYPE_ALIGN (record_type) < TYPE_ALIGN (field_type))
1542 DECL_ALIGN (field_decl) = TYPE_ALIGN (record_type);
1544 DECL_ALIGN (field_decl) = TYPE_ALIGN (field_type);
1548 DECL_PACKED (field_decl) = pos ? DECL_BIT_FIELD (field_decl) : packed;
1550 /* Bump the alignment if need be, either for bitfield/packing purposes or
1551 to satisfy the type requirements if no such consideration applies. When
1552 we get the alignment from the type, indicate if this is from an explicit
1553 user request, which prevents stor-layout from lowering it later on. */
1555 unsigned int bit_align
1556 = (DECL_BIT_FIELD (field_decl) ? 1
1557 : packed && TYPE_MODE (field_type) != BLKmode ? BITS_PER_UNIT : 0);
1559 if (bit_align > DECL_ALIGN (field_decl))
1560 DECL_ALIGN (field_decl) = bit_align;
1561 else if (!bit_align && TYPE_ALIGN (field_type) > DECL_ALIGN (field_decl))
1563 DECL_ALIGN (field_decl) = TYPE_ALIGN (field_type);
1564 DECL_USER_ALIGN (field_decl) = TYPE_USER_ALIGN (field_type);
1570 /* We need to pass in the alignment the DECL is known to have.
1571 This is the lowest-order bit set in POS, but no more than
1572 the alignment of the record, if one is specified. Note
1573 that an alignment of 0 is taken as infinite. */
1574 unsigned int known_align;
1576 if (host_integerp (pos, 1))
1577 known_align = tree_low_cst (pos, 1) & - tree_low_cst (pos, 1);
1579 known_align = BITS_PER_UNIT;
1581 if (TYPE_ALIGN (record_type)
1582 && (known_align == 0 || known_align > TYPE_ALIGN (record_type)))
1583 known_align = TYPE_ALIGN (record_type);
1585 layout_decl (field_decl, known_align);
1586 SET_DECL_OFFSET_ALIGN (field_decl,
1587 host_integerp (pos, 1) ? BIGGEST_ALIGNMENT
1589 pos_from_bit (&DECL_FIELD_OFFSET (field_decl),
1590 &DECL_FIELD_BIT_OFFSET (field_decl),
1591 DECL_OFFSET_ALIGN (field_decl), pos);
1594 /* In addition to what our caller says, claim the field is addressable if we
1595 know that its type is not suitable.
1597 The field may also be "technically" nonaddressable, meaning that even if
1598 we attempt to take the field's address we will actually get the address
1599 of a copy. This is the case for true bitfields, but the DECL_BIT_FIELD
1600 value we have at this point is not accurate enough, so we don't account
1601 for this here and let finish_record_type decide. */
1602 if (!addressable && !type_for_nonaliased_component_p (field_type))
1605 DECL_NONADDRESSABLE_P (field_decl) = !addressable;
1610 /* Return a PARM_DECL node. PARAM_NAME is the name of the parameter and
1611 PARAM_TYPE is its type. READONLY is true if the parameter is readonly
1612 (either an In parameter or an address of a pass-by-ref parameter). */
1615 create_param_decl (tree param_name, tree param_type, bool readonly)
1617 tree param_decl = build_decl (input_location,
1618 PARM_DECL, param_name, param_type);
1620 /* Honor TARGET_PROMOTE_PROTOTYPES like the C compiler, as not doing so
1621 can lead to various ABI violations. */
1622 if (targetm.calls.promote_prototypes (NULL_TREE)
1623 && INTEGRAL_TYPE_P (param_type)
1624 && TYPE_PRECISION (param_type) < TYPE_PRECISION (integer_type_node))
1626 /* We have to be careful about biased types here. Make a subtype
1627 of integer_type_node with the proper biasing. */
1628 if (TREE_CODE (param_type) == INTEGER_TYPE
1629 && TYPE_BIASED_REPRESENTATION_P (param_type))
1632 = make_unsigned_type (TYPE_PRECISION (integer_type_node));
1633 TREE_TYPE (subtype) = integer_type_node;
1634 TYPE_BIASED_REPRESENTATION_P (subtype) = 1;
1635 SET_TYPE_RM_MIN_VALUE (subtype, TYPE_MIN_VALUE (param_type));
1636 SET_TYPE_RM_MAX_VALUE (subtype, TYPE_MAX_VALUE (param_type));
1637 param_type = subtype;
1640 param_type = integer_type_node;
1643 DECL_ARG_TYPE (param_decl) = param_type;
1644 TREE_READONLY (param_decl) = readonly;
1648 /* Given a DECL and ATTR_LIST, process the listed attributes. */
1651 process_attributes (tree decl, struct attrib *attr_list)
1653 for (; attr_list; attr_list = attr_list->next)
1654 switch (attr_list->type)
1656 case ATTR_MACHINE_ATTRIBUTE:
1657 decl_attributes (&decl, tree_cons (attr_list->name, attr_list->args,
1659 ATTR_FLAG_TYPE_IN_PLACE);
1662 case ATTR_LINK_ALIAS:
1663 if (! DECL_EXTERNAL (decl))
1665 TREE_STATIC (decl) = 1;
1666 assemble_alias (decl, attr_list->name);
1670 case ATTR_WEAK_EXTERNAL:
1672 declare_weak (decl);
1674 post_error ("?weak declarations not supported on this target",
1675 attr_list->error_point);
1678 case ATTR_LINK_SECTION:
1679 if (targetm.have_named_sections)
1681 DECL_SECTION_NAME (decl)
1682 = build_string (IDENTIFIER_LENGTH (attr_list->name),
1683 IDENTIFIER_POINTER (attr_list->name));
1684 DECL_COMMON (decl) = 0;
1687 post_error ("?section attributes are not supported for this target",
1688 attr_list->error_point);
1691 case ATTR_LINK_CONSTRUCTOR:
1692 DECL_STATIC_CONSTRUCTOR (decl) = 1;
1693 TREE_USED (decl) = 1;
1696 case ATTR_LINK_DESTRUCTOR:
1697 DECL_STATIC_DESTRUCTOR (decl) = 1;
1698 TREE_USED (decl) = 1;
1701 case ATTR_THREAD_LOCAL_STORAGE:
1702 DECL_TLS_MODEL (decl) = decl_default_tls_model (decl);
1703 DECL_COMMON (decl) = 0;
1708 /* Record DECL as a global renaming pointer. */
1711 record_global_renaming_pointer (tree decl)
1713 gcc_assert (DECL_RENAMED_OBJECT (decl));
1714 VEC_safe_push (tree, gc, global_renaming_pointers, decl);
1717 /* Invalidate the global renaming pointers. */
1720 invalidate_global_renaming_pointers (void)
1725 for (i = 0; VEC_iterate(tree, global_renaming_pointers, i, iter); i++)
1726 SET_DECL_RENAMED_OBJECT (iter, NULL_TREE);
1728 VEC_free (tree, gc, global_renaming_pointers);
1731 /* Return true if VALUE is a known to be a multiple of FACTOR, which must be
1735 value_factor_p (tree value, HOST_WIDE_INT factor)
1737 if (host_integerp (value, 1))
1738 return tree_low_cst (value, 1) % factor == 0;
1740 if (TREE_CODE (value) == MULT_EXPR)
1741 return (value_factor_p (TREE_OPERAND (value, 0), factor)
1742 || value_factor_p (TREE_OPERAND (value, 1), factor));
1747 /* Given 2 consecutive field decls PREV_FIELD and CURR_FIELD, return true
1748 unless we can prove these 2 fields are laid out in such a way that no gap
1749 exist between the end of PREV_FIELD and the beginning of CURR_FIELD. OFFSET
1750 is the distance in bits between the end of PREV_FIELD and the starting
1751 position of CURR_FIELD. It is ignored if null. */
1754 potential_alignment_gap (tree prev_field, tree curr_field, tree offset)
1756 /* If this is the first field of the record, there cannot be any gap */
1760 /* If the previous field is a union type, then return False: The only
1761 time when such a field is not the last field of the record is when
1762 there are other components at fixed positions after it (meaning there
1763 was a rep clause for every field), in which case we don't want the
1764 alignment constraint to override them. */
1765 if (TREE_CODE (TREE_TYPE (prev_field)) == QUAL_UNION_TYPE)
1768 /* If the distance between the end of prev_field and the beginning of
1769 curr_field is constant, then there is a gap if the value of this
1770 constant is not null. */
1771 if (offset && host_integerp (offset, 1))
1772 return !integer_zerop (offset);
1774 /* If the size and position of the previous field are constant,
1775 then check the sum of this size and position. There will be a gap
1776 iff it is not multiple of the current field alignment. */
1777 if (host_integerp (DECL_SIZE (prev_field), 1)
1778 && host_integerp (bit_position (prev_field), 1))
1779 return ((tree_low_cst (bit_position (prev_field), 1)
1780 + tree_low_cst (DECL_SIZE (prev_field), 1))
1781 % DECL_ALIGN (curr_field) != 0);
1783 /* If both the position and size of the previous field are multiples
1784 of the current field alignment, there cannot be any gap. */
1785 if (value_factor_p (bit_position (prev_field), DECL_ALIGN (curr_field))
1786 && value_factor_p (DECL_SIZE (prev_field), DECL_ALIGN (curr_field)))
1789 /* Fallback, return that there may be a potential gap */
1793 /* Returns a LABEL_DECL node for LABEL_NAME. */
1796 create_label_decl (tree label_name)
1798 tree label_decl = build_decl (input_location,
1799 LABEL_DECL, label_name, void_type_node);
1801 DECL_CONTEXT (label_decl) = current_function_decl;
1802 DECL_MODE (label_decl) = VOIDmode;
1803 DECL_SOURCE_LOCATION (label_decl) = input_location;
1808 /* Returns a FUNCTION_DECL node. SUBPROG_NAME is the name of the subprogram,
1809 ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE
1810 node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of
1811 PARM_DECL nodes chained through the TREE_CHAIN field).
1813 INLINE_FLAG, PUBLIC_FLAG, EXTERN_FLAG, and ATTR_LIST are used to set the
1814 appropriate fields in the FUNCTION_DECL. GNAT_NODE gives the location. */
1817 create_subprog_decl (tree subprog_name, tree asm_name,
1818 tree subprog_type, tree param_decl_list, bool inline_flag,
1819 bool public_flag, bool extern_flag,
1820 struct attrib *attr_list, Node_Id gnat_node)
1822 tree return_type = TREE_TYPE (subprog_type);
1823 tree subprog_decl = build_decl (input_location,
1824 FUNCTION_DECL, subprog_name, subprog_type);
1826 /* If this is a non-inline function nested inside an inlined external
1827 function, we cannot honor both requests without cloning the nested
1828 function in the current unit since it is private to the other unit.
1829 We could inline the nested function as well but it's probably better
1830 to err on the side of too little inlining. */
1832 && current_function_decl
1833 && DECL_DECLARED_INLINE_P (current_function_decl)
1834 && DECL_EXTERNAL (current_function_decl))
1835 DECL_DECLARED_INLINE_P (current_function_decl) = 0;
1837 DECL_EXTERNAL (subprog_decl) = extern_flag;
1838 TREE_PUBLIC (subprog_decl) = public_flag;
1839 TREE_STATIC (subprog_decl) = 1;
1840 TREE_READONLY (subprog_decl) = TYPE_READONLY (subprog_type);
1841 TREE_THIS_VOLATILE (subprog_decl) = TYPE_VOLATILE (subprog_type);
1842 TREE_SIDE_EFFECTS (subprog_decl) = TYPE_VOLATILE (subprog_type);
1843 DECL_DECLARED_INLINE_P (subprog_decl) = inline_flag;
1844 DECL_ARGUMENTS (subprog_decl) = param_decl_list;
1845 DECL_RESULT (subprog_decl) = build_decl (input_location,
1846 RESULT_DECL, 0, return_type);
1847 DECL_ARTIFICIAL (DECL_RESULT (subprog_decl)) = 1;
1848 DECL_IGNORED_P (DECL_RESULT (subprog_decl)) = 1;
1850 /* TREE_ADDRESSABLE is set on the result type to request the use of the
1851 target by-reference return mechanism. This is not supported all the
1852 way down to RTL expansion with GCC 4, which ICEs on temporary creation
1853 attempts with such a type and expects DECL_BY_REFERENCE to be set on
1854 the RESULT_DECL instead - see gnat_genericize for more details. */
1855 if (TREE_ADDRESSABLE (TREE_TYPE (DECL_RESULT (subprog_decl))))
1857 tree result_decl = DECL_RESULT (subprog_decl);
1859 TREE_ADDRESSABLE (TREE_TYPE (result_decl)) = 0;
1860 DECL_BY_REFERENCE (result_decl) = 1;
1865 SET_DECL_ASSEMBLER_NAME (subprog_decl, asm_name);
1867 /* The expand_main_function circuitry expects "main_identifier_node" to
1868 designate the DECL_NAME of the 'main' entry point, in turn expected
1869 to be declared as the "main" function literally by default. Ada
1870 program entry points are typically declared with a different name
1871 within the binder generated file, exported as 'main' to satisfy the
1872 system expectations. Redirect main_identifier_node in this case. */
1873 if (asm_name == main_identifier_node)
1874 main_identifier_node = DECL_NAME (subprog_decl);
1877 process_attributes (subprog_decl, attr_list);
1879 /* Add this decl to the current binding level. */
1880 gnat_pushdecl (subprog_decl, gnat_node);
1882 /* Output the assembler code and/or RTL for the declaration. */
1883 rest_of_decl_compilation (subprog_decl, global_bindings_p (), 0);
1885 return subprog_decl;
1888 /* Set up the framework for generating code for SUBPROG_DECL, a subprogram
1889 body. This routine needs to be invoked before processing the declarations
1890 appearing in the subprogram. */
1893 begin_subprog_body (tree subprog_decl)
1897 current_function_decl = subprog_decl;
1898 announce_function (subprog_decl);
1900 /* Enter a new binding level and show that all the parameters belong to
1903 for (param_decl = DECL_ARGUMENTS (subprog_decl); param_decl;
1904 param_decl = TREE_CHAIN (param_decl))
1905 DECL_CONTEXT (param_decl) = subprog_decl;
1907 make_decl_rtl (subprog_decl);
1909 /* We handle pending sizes via the elaboration of types, so we don't need to
1910 save them. This causes them to be marked as part of the outer function
1911 and then discarded. */
1912 get_pending_sizes ();
1916 /* Helper for the genericization callback. Return a dereference of VAL
1917 if it is of a reference type. */
1920 convert_from_reference (tree val)
1922 tree value_type, ref;
1924 if (TREE_CODE (TREE_TYPE (val)) != REFERENCE_TYPE)
1927 value_type = TREE_TYPE (TREE_TYPE (val));
1928 ref = build1 (INDIRECT_REF, value_type, val);
1930 /* See if what we reference is CONST or VOLATILE, which requires
1931 looking into array types to get to the component type. */
1933 while (TREE_CODE (value_type) == ARRAY_TYPE)
1934 value_type = TREE_TYPE (value_type);
1937 = (TYPE_QUALS (value_type) & TYPE_QUAL_CONST);
1938 TREE_THIS_VOLATILE (ref)
1939 = (TYPE_QUALS (value_type) & TYPE_QUAL_VOLATILE);
1941 TREE_SIDE_EFFECTS (ref)
1942 = (TREE_THIS_VOLATILE (ref) || TREE_SIDE_EFFECTS (val));
1947 /* Helper for the genericization callback. Returns true if T denotes
1948 a RESULT_DECL with DECL_BY_REFERENCE set. */
1951 is_byref_result (tree t)
1953 return (TREE_CODE (t) == RESULT_DECL && DECL_BY_REFERENCE (t));
1957 /* Tree walking callback for gnat_genericize. Currently ...
1959 o Adjust references to the function's DECL_RESULT if it is marked
1960 DECL_BY_REFERENCE and so has had its type turned into a reference
1961 type at the end of the function compilation. */
1964 gnat_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
1966 /* This implementation is modeled after what the C++ front-end is
1967 doing, basis of the downstream passes behavior. */
1969 tree stmt = *stmt_p;
1970 struct pointer_set_t *p_set = (struct pointer_set_t*) data;
1972 /* If we have a direct mention of the result decl, dereference. */
1973 if (is_byref_result (stmt))
1975 *stmt_p = convert_from_reference (stmt);
1980 /* Otherwise, no need to walk the same tree twice. */
1981 if (pointer_set_contains (p_set, stmt))
1987 /* If we are taking the address of what now is a reference, just get the
1989 if (TREE_CODE (stmt) == ADDR_EXPR
1990 && is_byref_result (TREE_OPERAND (stmt, 0)))
1992 *stmt_p = convert (TREE_TYPE (stmt), TREE_OPERAND (stmt, 0));
1996 /* Don't dereference an by-reference RESULT_DECL inside a RETURN_EXPR. */
1997 else if (TREE_CODE (stmt) == RETURN_EXPR
1998 && TREE_OPERAND (stmt, 0)
1999 && is_byref_result (TREE_OPERAND (stmt, 0)))
2002 /* Don't look inside trees that cannot embed references of interest. */
2003 else if (IS_TYPE_OR_DECL_P (stmt))
2006 pointer_set_insert (p_set, *stmt_p);
2011 /* Perform lowering of Ada trees to GENERIC. In particular:
2013 o Turn a DECL_BY_REFERENCE RESULT_DECL into a real by-reference decl
2014 and adjust all the references to this decl accordingly. */
2017 gnat_genericize (tree fndecl)
2019 /* Prior to GCC 4, an explicit By_Reference result mechanism for a function
2020 was handled by simply setting TREE_ADDRESSABLE on the result type.
2021 Everything required to actually pass by invisible ref using the target
2022 mechanism (e.g. extra parameter) was handled at RTL expansion time.
2024 This doesn't work with GCC 4 any more for several reasons. First, the
2025 gimplification process might need the creation of temporaries of this
2026 type, and the gimplifier ICEs on such attempts. Second, the middle-end
2027 now relies on a different attribute for such cases (DECL_BY_REFERENCE on
2028 RESULT/PARM_DECLs), and expects the user invisible by-reference-ness to
2029 be explicitly accounted for by the front-end in the function body.
2031 We achieve the complete transformation in two steps:
2033 1/ create_subprog_decl performs early attribute tweaks: it clears
2034 TREE_ADDRESSABLE from the result type and sets DECL_BY_REFERENCE on
2035 the result decl. The former ensures that the bit isn't set in the GCC
2036 tree saved for the function, so prevents ICEs on temporary creation.
2037 The latter we use here to trigger the rest of the processing.
2039 2/ This function performs the type transformation on the result decl
2040 and adjusts all the references to this decl from the function body
2043 Clearing TREE_ADDRESSABLE from the type differs from the C++ front-end
2044 strategy, which escapes the gimplifier temporary creation issues by
2045 creating it's own temporaries using TARGET_EXPR nodes. Our way relies
2046 on simple specific support code in aggregate_value_p to look at the
2047 target function result decl explicitly. */
2049 struct pointer_set_t *p_set;
2050 tree decl_result = DECL_RESULT (fndecl);
2052 if (!DECL_BY_REFERENCE (decl_result))
2055 /* Make the DECL_RESULT explicitly by-reference and adjust all the
2056 occurrences in the function body using the common tree-walking facility.
2057 We want to see every occurrence of the result decl to adjust the
2058 referencing tree, so need to use our own pointer set to control which
2059 trees should be visited again or not. */
2061 p_set = pointer_set_create ();
2063 TREE_TYPE (decl_result) = build_reference_type (TREE_TYPE (decl_result));
2064 TREE_ADDRESSABLE (decl_result) = 0;
2065 relayout_decl (decl_result);
2067 walk_tree (&DECL_SAVED_TREE (fndecl), gnat_genericize_r, p_set, NULL);
2069 pointer_set_destroy (p_set);
2072 /* Finish the definition of the current subprogram BODY and compile it all the
2073 way to assembler language output. ELAB_P tells if this is called for an
2074 elaboration routine, to be entirely discarded if empty. */
2077 end_subprog_body (tree body, bool elab_p)
2079 tree fndecl = current_function_decl;
2081 /* Mark the BLOCK for this level as being for this function and pop the
2082 level. Since the vars in it are the parameters, clear them. */
2083 BLOCK_VARS (current_binding_level->block) = 0;
2084 BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl;
2085 DECL_INITIAL (fndecl) = current_binding_level->block;
2088 /* We handle pending sizes via the elaboration of types, so we don't
2089 need to save them. */
2090 get_pending_sizes ();
2092 /* Mark the RESULT_DECL as being in this subprogram. */
2093 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
2095 DECL_SAVED_TREE (fndecl) = body;
2097 current_function_decl = DECL_CONTEXT (fndecl);
2100 /* We cannot track the location of errors past this point. */
2101 error_gnat_node = Empty;
2103 /* If we're only annotating types, don't actually compile this function. */
2104 if (type_annotate_only)
2107 /* Perform the required pre-gimplification transformations on the tree. */
2108 gnat_genericize (fndecl);
2110 /* We do different things for nested and non-nested functions.
2111 ??? This should be in cgraph. */
2112 if (!DECL_CONTEXT (fndecl))
2114 gnat_gimplify_function (fndecl);
2116 /* If this is an empty elaboration proc, just discard the node.
2117 Otherwise, compile further. */
2118 if (elab_p && empty_body_p (gimple_body (fndecl)))
2119 cgraph_remove_node (cgraph_node (fndecl));
2121 cgraph_finalize_function (fndecl, false);
2124 /* Register this function with cgraph just far enough to get it
2125 added to our parent's nested function list. */
2126 (void) cgraph_node (fndecl);
2129 /* Convert FNDECL's code to GIMPLE and handle any nested functions. */
2132 gnat_gimplify_function (tree fndecl)
2134 struct cgraph_node *cgn;
2136 dump_function (TDI_original, fndecl);
2137 gimplify_function_tree (fndecl);
2138 dump_function (TDI_generic, fndecl);
2140 /* Convert all nested functions to GIMPLE now. We do things in this order
2141 so that items like VLA sizes are expanded properly in the context of the
2142 correct function. */
2143 cgn = cgraph_node (fndecl);
2144 for (cgn = cgn->nested; cgn; cgn = cgn->next_nested)
2145 gnat_gimplify_function (cgn->decl);
2149 gnat_builtin_function (tree decl)
2151 gnat_pushdecl (decl, Empty);
2155 /* Return an integer type with the number of bits of precision given by
2156 PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise
2157 it is a signed type. */
2160 gnat_type_for_size (unsigned precision, int unsignedp)
2165 if (precision <= 2 * MAX_BITS_PER_WORD
2166 && signed_and_unsigned_types[precision][unsignedp])
2167 return signed_and_unsigned_types[precision][unsignedp];
2170 t = make_unsigned_type (precision);
2172 t = make_signed_type (precision);
2174 if (precision <= 2 * MAX_BITS_PER_WORD)
2175 signed_and_unsigned_types[precision][unsignedp] = t;
2179 sprintf (type_name, "%sSIGNED_%d", unsignedp ? "UN" : "", precision);
2180 TYPE_NAME (t) = get_identifier (type_name);
2186 /* Likewise for floating-point types. */
2189 float_type_for_precision (int precision, enum machine_mode mode)
2194 if (float_types[(int) mode])
2195 return float_types[(int) mode];
2197 float_types[(int) mode] = t = make_node (REAL_TYPE);
2198 TYPE_PRECISION (t) = precision;
2201 gcc_assert (TYPE_MODE (t) == mode);
2204 sprintf (type_name, "FLOAT_%d", precision);
2205 TYPE_NAME (t) = get_identifier (type_name);
2211 /* Return a data type that has machine mode MODE. UNSIGNEDP selects
2212 an unsigned type; otherwise a signed type is returned. */
2215 gnat_type_for_mode (enum machine_mode mode, int unsignedp)
2217 if (mode == BLKmode)
2219 else if (mode == VOIDmode)
2220 return void_type_node;
2221 else if (COMPLEX_MODE_P (mode))
2223 else if (SCALAR_FLOAT_MODE_P (mode))
2224 return float_type_for_precision (GET_MODE_PRECISION (mode), mode);
2225 else if (SCALAR_INT_MODE_P (mode))
2226 return gnat_type_for_size (GET_MODE_BITSIZE (mode), unsignedp);
2231 /* Return the unsigned version of a TYPE_NODE, a scalar type. */
2234 gnat_unsigned_type (tree type_node)
2236 tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 1);
2238 if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node))
2240 type = copy_node (type);
2241 TREE_TYPE (type) = type_node;
2243 else if (TREE_TYPE (type_node)
2244 && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE
2245 && TYPE_MODULAR_P (TREE_TYPE (type_node)))
2247 type = copy_node (type);
2248 TREE_TYPE (type) = TREE_TYPE (type_node);
2254 /* Return the signed version of a TYPE_NODE, a scalar type. */
2257 gnat_signed_type (tree type_node)
2259 tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 0);
2261 if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node))
2263 type = copy_node (type);
2264 TREE_TYPE (type) = type_node;
2266 else if (TREE_TYPE (type_node)
2267 && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE
2268 && TYPE_MODULAR_P (TREE_TYPE (type_node)))
2270 type = copy_node (type);
2271 TREE_TYPE (type) = TREE_TYPE (type_node);
2277 /* Return 1 if the types T1 and T2 are compatible, i.e. if they can be
2278 transparently converted to each other. */
2281 gnat_types_compatible_p (tree t1, tree t2)
2283 enum tree_code code;
2285 /* This is the default criterion. */
2286 if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2))
2289 /* We only check structural equivalence here. */
2290 if ((code = TREE_CODE (t1)) != TREE_CODE (t2))
2293 /* Array types are also compatible if they are constrained and have
2294 the same component type and the same domain. */
2295 if (code == ARRAY_TYPE
2296 && TREE_TYPE (t1) == TREE_TYPE (t2)
2297 && (TYPE_DOMAIN (t1) == TYPE_DOMAIN (t2)
2298 || (TYPE_DOMAIN (t1)
2300 && tree_int_cst_equal (TYPE_MIN_VALUE (TYPE_DOMAIN (t1)),
2301 TYPE_MIN_VALUE (TYPE_DOMAIN (t2)))
2302 && tree_int_cst_equal (TYPE_MAX_VALUE (TYPE_DOMAIN (t1)),
2303 TYPE_MAX_VALUE (TYPE_DOMAIN (t2))))))
2306 /* Padding record types are also compatible if they pad the same
2307 type and have the same constant size. */
2308 if (code == RECORD_TYPE
2309 && TYPE_IS_PADDING_P (t1) && TYPE_IS_PADDING_P (t2)
2310 && TREE_TYPE (TYPE_FIELDS (t1)) == TREE_TYPE (TYPE_FIELDS (t2))
2311 && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2)))
2317 /* EXP is an expression for the size of an object. If this size contains
2318 discriminant references, replace them with the maximum (if MAX_P) or
2319 minimum (if !MAX_P) possible value of the discriminant. */
2322 max_size (tree exp, bool max_p)
2324 enum tree_code code = TREE_CODE (exp);
2325 tree type = TREE_TYPE (exp);
2327 switch (TREE_CODE_CLASS (code))
2329 case tcc_declaration:
2334 if (code == CALL_EXPR)
2339 t = maybe_inline_call_in_expr (exp);
2341 return max_size (t, max_p);
2343 n = call_expr_nargs (exp);
2345 argarray = (tree *) alloca (n * sizeof (tree));
2346 for (i = 0; i < n; i++)
2347 argarray[i] = max_size (CALL_EXPR_ARG (exp, i), max_p);
2348 return build_call_array (type, CALL_EXPR_FN (exp), n, argarray);
2353 /* If this contains a PLACEHOLDER_EXPR, it is the thing we want to
2354 modify. Otherwise, we treat it like a variable. */
2355 if (!CONTAINS_PLACEHOLDER_P (exp))
2358 type = TREE_TYPE (TREE_OPERAND (exp, 1));
2360 max_size (max_p ? TYPE_MAX_VALUE (type) : TYPE_MIN_VALUE (type), true);
2362 case tcc_comparison:
2363 return max_p ? size_one_node : size_zero_node;
2367 case tcc_expression:
2368 switch (TREE_CODE_LENGTH (code))
2371 if (code == NON_LVALUE_EXPR)
2372 return max_size (TREE_OPERAND (exp, 0), max_p);
2375 fold_build1 (code, type,
2376 max_size (TREE_OPERAND (exp, 0),
2377 code == NEGATE_EXPR ? !max_p : max_p));
2380 if (code == COMPOUND_EXPR)
2381 return max_size (TREE_OPERAND (exp, 1), max_p);
2383 /* Calculate "(A ? B : C) - D" as "A ? B - D : C - D" which
2384 may provide a tighter bound on max_size. */
2385 if (code == MINUS_EXPR
2386 && TREE_CODE (TREE_OPERAND (exp, 0)) == COND_EXPR)
2388 tree lhs = fold_build2 (MINUS_EXPR, type,
2389 TREE_OPERAND (TREE_OPERAND (exp, 0), 1),
2390 TREE_OPERAND (exp, 1));
2391 tree rhs = fold_build2 (MINUS_EXPR, type,
2392 TREE_OPERAND (TREE_OPERAND (exp, 0), 2),
2393 TREE_OPERAND (exp, 1));
2394 return fold_build2 (max_p ? MAX_EXPR : MIN_EXPR, type,
2395 max_size (lhs, max_p),
2396 max_size (rhs, max_p));
2400 tree lhs = max_size (TREE_OPERAND (exp, 0), max_p);
2401 tree rhs = max_size (TREE_OPERAND (exp, 1),
2402 code == MINUS_EXPR ? !max_p : max_p);
2404 /* Special-case wanting the maximum value of a MIN_EXPR.
2405 In that case, if one side overflows, return the other.
2406 sizetype is signed, but we know sizes are non-negative.
2407 Likewise, handle a MINUS_EXPR or PLUS_EXPR with the LHS
2408 overflowing or the maximum possible value and the RHS
2412 && TREE_CODE (rhs) == INTEGER_CST
2413 && TREE_OVERFLOW (rhs))
2417 && TREE_CODE (lhs) == INTEGER_CST
2418 && TREE_OVERFLOW (lhs))
2420 else if ((code == MINUS_EXPR || code == PLUS_EXPR)
2421 && ((TREE_CODE (lhs) == INTEGER_CST
2422 && TREE_OVERFLOW (lhs))
2423 || operand_equal_p (lhs, TYPE_MAX_VALUE (type), 0))
2424 && !TREE_CONSTANT (rhs))
2427 return fold_build2 (code, type, lhs, rhs);
2431 if (code == SAVE_EXPR)
2433 else if (code == COND_EXPR)
2434 return fold_build2 (max_p ? MAX_EXPR : MIN_EXPR, type,
2435 max_size (TREE_OPERAND (exp, 1), max_p),
2436 max_size (TREE_OPERAND (exp, 2), max_p));
2439 /* Other tree classes cannot happen. */
2447 /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE.
2448 EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs.
2449 Return a constructor for the template. */
2452 build_template (tree template_type, tree array_type, tree expr)
2454 tree template_elts = NULL_TREE;
2455 tree bound_list = NULL_TREE;
2458 while (TREE_CODE (array_type) == RECORD_TYPE
2459 && (TYPE_IS_PADDING_P (array_type)
2460 || TYPE_JUSTIFIED_MODULAR_P (array_type)))
2461 array_type = TREE_TYPE (TYPE_FIELDS (array_type));
2463 if (TREE_CODE (array_type) == ARRAY_TYPE
2464 || (TREE_CODE (array_type) == INTEGER_TYPE
2465 && TYPE_HAS_ACTUAL_BOUNDS_P (array_type)))
2466 bound_list = TYPE_ACTUAL_BOUNDS (array_type);
2468 /* First make the list for a CONSTRUCTOR for the template. Go down the
2469 field list of the template instead of the type chain because this
2470 array might be an Ada array of arrays and we can't tell where the
2471 nested arrays stop being the underlying object. */
2473 for (field = TYPE_FIELDS (template_type); field;
2475 ? (bound_list = TREE_CHAIN (bound_list))
2476 : (array_type = TREE_TYPE (array_type))),
2477 field = TREE_CHAIN (TREE_CHAIN (field)))
2479 tree bounds, min, max;
2481 /* If we have a bound list, get the bounds from there. Likewise
2482 for an ARRAY_TYPE. Otherwise, if expr is a PARM_DECL with
2483 DECL_BY_COMPONENT_PTR_P, use the bounds of the field in the template.
2484 This will give us a maximum range. */
2486 bounds = TREE_VALUE (bound_list);
2487 else if (TREE_CODE (array_type) == ARRAY_TYPE)
2488 bounds = TYPE_INDEX_TYPE (TYPE_DOMAIN (array_type));
2489 else if (expr && TREE_CODE (expr) == PARM_DECL
2490 && DECL_BY_COMPONENT_PTR_P (expr))
2491 bounds = TREE_TYPE (field);
2495 min = convert (TREE_TYPE (field), TYPE_MIN_VALUE (bounds));
2496 max = convert (TREE_TYPE (TREE_CHAIN (field)), TYPE_MAX_VALUE (bounds));
2498 /* If either MIN or MAX involve a PLACEHOLDER_EXPR, we must
2499 substitute it from OBJECT. */
2500 min = SUBSTITUTE_PLACEHOLDER_IN_EXPR (min, expr);
2501 max = SUBSTITUTE_PLACEHOLDER_IN_EXPR (max, expr);
2503 template_elts = tree_cons (TREE_CHAIN (field), max,
2504 tree_cons (field, min, template_elts));
2507 return gnat_build_constructor (template_type, nreverse (template_elts));
2510 /* Build a 32bit VMS descriptor from a Mechanism_Type, which must specify
2511 a descriptor type, and the GCC type of an object. Each FIELD_DECL
2512 in the type contains in its DECL_INITIAL the expression to use when
2513 a constructor is made for the type. GNAT_ENTITY is an entity used
2514 to print out an error message if the mechanism cannot be applied to
2515 an object of that type and also for the name. */
2518 build_vms_descriptor32 (tree type, Mechanism_Type mech, Entity_Id gnat_entity)
2520 tree record_type = make_node (RECORD_TYPE);
2521 tree pointer32_type;
2522 tree field_list = 0;
2531 /* If TYPE is an unconstrained array, use the underlying array type. */
2532 if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
2533 type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type))));
2535 /* If this is an array, compute the number of dimensions in the array,
2536 get the index types, and point to the inner type. */
2537 if (TREE_CODE (type) != ARRAY_TYPE)
2540 for (ndim = 1, inner_type = type;
2541 TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE
2542 && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type));
2543 ndim++, inner_type = TREE_TYPE (inner_type))
2546 idx_arr = (tree *) alloca (ndim * sizeof (tree));
2548 if (mech != By_Descriptor_NCA && mech != By_Short_Descriptor_NCA
2549 && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type))
2550 for (i = ndim - 1, inner_type = type;
2552 i--, inner_type = TREE_TYPE (inner_type))
2553 idx_arr[i] = TYPE_DOMAIN (inner_type);
2555 for (i = 0, inner_type = type;
2557 i++, inner_type = TREE_TYPE (inner_type))
2558 idx_arr[i] = TYPE_DOMAIN (inner_type);
2560 /* Now get the DTYPE value. */
2561 switch (TREE_CODE (type))
2566 if (TYPE_VAX_FLOATING_POINT_P (type))
2567 switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1))
2580 switch (GET_MODE_BITSIZE (TYPE_MODE (type)))
2583 dtype = TYPE_UNSIGNED (type) ? 2 : 6;
2586 dtype = TYPE_UNSIGNED (type) ? 3 : 7;
2589 dtype = TYPE_UNSIGNED (type) ? 4 : 8;
2592 dtype = TYPE_UNSIGNED (type) ? 5 : 9;
2595 dtype = TYPE_UNSIGNED (type) ? 25 : 26;
2601 dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53;
2605 if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE
2606 && TYPE_VAX_FLOATING_POINT_P (type))
2607 switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1))
2619 dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55;
2630 /* Get the CLASS value. */
2633 case By_Descriptor_A:
2634 case By_Short_Descriptor_A:
2637 case By_Descriptor_NCA:
2638 case By_Short_Descriptor_NCA:
2641 case By_Descriptor_SB:
2642 case By_Short_Descriptor_SB:
2646 case By_Short_Descriptor:
2647 case By_Descriptor_S:
2648 case By_Short_Descriptor_S:
2654 /* Make the type for a descriptor for VMS. The first four fields
2655 are the same for all types. */
2658 = chainon (field_list,
2659 make_descriptor_field
2660 ("LENGTH", gnat_type_for_size (16, 1), record_type,
2661 size_in_bytes ((mech == By_Descriptor_A ||
2662 mech == By_Short_Descriptor_A)
2663 ? inner_type : type)));
2665 field_list = chainon (field_list,
2666 make_descriptor_field ("DTYPE",
2667 gnat_type_for_size (8, 1),
2668 record_type, size_int (dtype)));
2669 field_list = chainon (field_list,
2670 make_descriptor_field ("CLASS",
2671 gnat_type_for_size (8, 1),
2672 record_type, size_int (klass)));
2674 /* Of course this will crash at run-time if the address space is not
2675 within the low 32 bits, but there is nothing else we can do. */
2676 pointer32_type = build_pointer_type_for_mode (type, SImode, false);
2679 = chainon (field_list,
2680 make_descriptor_field
2681 ("POINTER", pointer32_type, record_type,
2682 build_unary_op (ADDR_EXPR,
2684 build0 (PLACEHOLDER_EXPR, type))));
2689 case By_Short_Descriptor:
2690 case By_Descriptor_S:
2691 case By_Short_Descriptor_S:
2694 case By_Descriptor_SB:
2695 case By_Short_Descriptor_SB:
2697 = chainon (field_list,
2698 make_descriptor_field
2699 ("SB_L1", gnat_type_for_size (32, 1), record_type,
2700 TREE_CODE (type) == ARRAY_TYPE
2701 ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) : size_zero_node));
2703 = chainon (field_list,
2704 make_descriptor_field
2705 ("SB_U1", gnat_type_for_size (32, 1), record_type,
2706 TREE_CODE (type) == ARRAY_TYPE
2707 ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) : size_zero_node));
2710 case By_Descriptor_A:
2711 case By_Short_Descriptor_A:
2712 case By_Descriptor_NCA:
2713 case By_Short_Descriptor_NCA:
2714 field_list = chainon (field_list,
2715 make_descriptor_field ("SCALE",
2716 gnat_type_for_size (8, 1),
2720 field_list = chainon (field_list,
2721 make_descriptor_field ("DIGITS",
2722 gnat_type_for_size (8, 1),
2727 = chainon (field_list,
2728 make_descriptor_field
2729 ("AFLAGS", gnat_type_for_size (8, 1), record_type,
2730 size_int ((mech == By_Descriptor_NCA ||
2731 mech == By_Short_Descriptor_NCA)
2733 /* Set FL_COLUMN, FL_COEFF, and FL_BOUNDS. */
2734 : (TREE_CODE (type) == ARRAY_TYPE
2735 && TYPE_CONVENTION_FORTRAN_P (type)
2738 field_list = chainon (field_list,
2739 make_descriptor_field ("DIMCT",
2740 gnat_type_for_size (8, 1),
2744 field_list = chainon (field_list,
2745 make_descriptor_field ("ARSIZE",
2746 gnat_type_for_size (32, 1),
2748 size_in_bytes (type)));
2750 /* Now build a pointer to the 0,0,0... element. */
2751 tem = build0 (PLACEHOLDER_EXPR, type);
2752 for (i = 0, inner_type = type; i < ndim;
2753 i++, inner_type = TREE_TYPE (inner_type))
2754 tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem,
2755 convert (TYPE_DOMAIN (inner_type), size_zero_node),
2756 NULL_TREE, NULL_TREE);
2759 = chainon (field_list,
2760 make_descriptor_field
2762 build_pointer_type_for_mode (inner_type, SImode, false),
2765 build_pointer_type_for_mode (inner_type, SImode,
2769 /* Next come the addressing coefficients. */
2770 tem = size_one_node;
2771 for (i = 0; i < ndim; i++)
2775 = size_binop (MULT_EXPR, tem,
2776 size_binop (PLUS_EXPR,
2777 size_binop (MINUS_EXPR,
2778 TYPE_MAX_VALUE (idx_arr[i]),
2779 TYPE_MIN_VALUE (idx_arr[i])),
2782 fname[0] = ((mech == By_Descriptor_NCA ||
2783 mech == By_Short_Descriptor_NCA) ? 'S' : 'M');
2784 fname[1] = '0' + i, fname[2] = 0;
2786 = chainon (field_list,
2787 make_descriptor_field (fname,
2788 gnat_type_for_size (32, 1),
2789 record_type, idx_length));
2791 if (mech == By_Descriptor_NCA || mech == By_Short_Descriptor_NCA)
2795 /* Finally here are the bounds. */
2796 for (i = 0; i < ndim; i++)
2800 fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0;
2802 = chainon (field_list,
2803 make_descriptor_field
2804 (fname, gnat_type_for_size (32, 1), record_type,
2805 TYPE_MIN_VALUE (idx_arr[i])));
2809 = chainon (field_list,
2810 make_descriptor_field
2811 (fname, gnat_type_for_size (32, 1), record_type,
2812 TYPE_MAX_VALUE (idx_arr[i])));
2817 post_error ("unsupported descriptor type for &", gnat_entity);
2820 TYPE_NAME (record_type) = create_concat_name (gnat_entity, "DESC");
2821 finish_record_type (record_type, field_list, 0, true);
2825 /* Build a 64bit VMS descriptor from a Mechanism_Type, which must specify
2826 a descriptor type, and the GCC type of an object. Each FIELD_DECL
2827 in the type contains in its DECL_INITIAL the expression to use when
2828 a constructor is made for the type. GNAT_ENTITY is an entity used
2829 to print out an error message if the mechanism cannot be applied to
2830 an object of that type and also for the name. */
2833 build_vms_descriptor (tree type, Mechanism_Type mech, Entity_Id gnat_entity)
2835 tree record64_type = make_node (RECORD_TYPE);
2836 tree pointer64_type;
2837 tree field_list64 = 0;
2846 /* If TYPE is an unconstrained array, use the underlying array type. */
2847 if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
2848 type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type))));
2850 /* If this is an array, compute the number of dimensions in the array,
2851 get the index types, and point to the inner type. */
2852 if (TREE_CODE (type) != ARRAY_TYPE)
2855 for (ndim = 1, inner_type = type;
2856 TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE
2857 && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type));
2858 ndim++, inner_type = TREE_TYPE (inner_type))
2861 idx_arr = (tree *) alloca (ndim * sizeof (tree));
2863 if (mech != By_Descriptor_NCA
2864 && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type))
2865 for (i = ndim - 1, inner_type = type;
2867 i--, inner_type = TREE_TYPE (inner_type))
2868 idx_arr[i] = TYPE_DOMAIN (inner_type);
2870 for (i = 0, inner_type = type;
2872 i++, inner_type = TREE_TYPE (inner_type))
2873 idx_arr[i] = TYPE_DOMAIN (inner_type);
2875 /* Now get the DTYPE value. */
2876 switch (TREE_CODE (type))
2881 if (TYPE_VAX_FLOATING_POINT_P (type))
2882 switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1))
2895 switch (GET_MODE_BITSIZE (TYPE_MODE (type)))
2898 dtype = TYPE_UNSIGNED (type) ? 2 : 6;
2901 dtype = TYPE_UNSIGNED (type) ? 3 : 7;
2904 dtype = TYPE_UNSIGNED (type) ? 4 : 8;
2907 dtype = TYPE_UNSIGNED (type) ? 5 : 9;
2910 dtype = TYPE_UNSIGNED (type) ? 25 : 26;
2916 dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53;
2920 if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE
2921 && TYPE_VAX_FLOATING_POINT_P (type))
2922 switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1))
2934 dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55;
2945 /* Get the CLASS value. */
2948 case By_Descriptor_A:
2951 case By_Descriptor_NCA:
2954 case By_Descriptor_SB:
2958 case By_Descriptor_S:
2964 /* Make the type for a 64bit descriptor for VMS. The first six fields
2965 are the same for all types. */
2967 field_list64 = chainon (field_list64,
2968 make_descriptor_field ("MBO",
2969 gnat_type_for_size (16, 1),
2970 record64_type, size_int (1)));
2972 field_list64 = chainon (field_list64,
2973 make_descriptor_field ("DTYPE",
2974 gnat_type_for_size (8, 1),
2975 record64_type, size_int (dtype)));
2976 field_list64 = chainon (field_list64,
2977 make_descriptor_field ("CLASS",
2978 gnat_type_for_size (8, 1),
2979 record64_type, size_int (klass)));
2981 field_list64 = chainon (field_list64,
2982 make_descriptor_field ("MBMO",
2983 gnat_type_for_size (32, 1),
2984 record64_type, ssize_int (-1)));
2987 = chainon (field_list64,
2988 make_descriptor_field
2989 ("LENGTH", gnat_type_for_size (64, 1), record64_type,
2990 size_in_bytes (mech == By_Descriptor_A ? inner_type : type)));
2992 pointer64_type = build_pointer_type_for_mode (type, DImode, false);
2995 = chainon (field_list64,
2996 make_descriptor_field
2997 ("POINTER", pointer64_type, record64_type,
2998 build_unary_op (ADDR_EXPR,
3000 build0 (PLACEHOLDER_EXPR, type))));
3005 case By_Descriptor_S:
3008 case By_Descriptor_SB:
3010 = chainon (field_list64,
3011 make_descriptor_field
3012 ("SB_L1", gnat_type_for_size (64, 1), record64_type,
3013 TREE_CODE (type) == ARRAY_TYPE
3014 ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) : size_zero_node));
3016 = chainon (field_list64,
3017 make_descriptor_field
3018 ("SB_U1", gnat_type_for_size (64, 1), record64_type,
3019 TREE_CODE (type) == ARRAY_TYPE
3020 ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) : size_zero_node));
3023 case By_Descriptor_A:
3024 case By_Descriptor_NCA:
3025 field_list64 = chainon (field_list64,
3026 make_descriptor_field ("SCALE",
3027 gnat_type_for_size (8, 1),
3031 field_list64 = chainon (field_list64,
3032 make_descriptor_field ("DIGITS",
3033 gnat_type_for_size (8, 1),
3038 = chainon (field_list64,
3039 make_descriptor_field
3040 ("AFLAGS", gnat_type_for_size (8, 1), record64_type,
3041 size_int (mech == By_Descriptor_NCA
3043 /* Set FL_COLUMN, FL_COEFF, and FL_BOUNDS. */
3044 : (TREE_CODE (type) == ARRAY_TYPE
3045 && TYPE_CONVENTION_FORTRAN_P (type)
3048 field_list64 = chainon (field_list64,
3049 make_descriptor_field ("DIMCT",
3050 gnat_type_for_size (8, 1),
3054 field_list64 = chainon (field_list64,
3055 make_descriptor_field ("MBZ",
3056 gnat_type_for_size (32, 1),
3059 field_list64 = chainon (field_list64,
3060 make_descriptor_field ("ARSIZE",
3061 gnat_type_for_size (64, 1),
3063 size_in_bytes (type)));
3065 /* Now build a pointer to the 0,0,0... element. */
3066 tem = build0 (PLACEHOLDER_EXPR, type);
3067 for (i = 0, inner_type = type; i < ndim;
3068 i++, inner_type = TREE_TYPE (inner_type))
3069 tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem,
3070 convert (TYPE_DOMAIN (inner_type), size_zero_node),
3071 NULL_TREE, NULL_TREE);
3074 = chainon (field_list64,
3075 make_descriptor_field
3077 build_pointer_type_for_mode (inner_type, DImode, false),
3080 build_pointer_type_for_mode (inner_type, DImode,
3084 /* Next come the addressing coefficients. */
3085 tem = size_one_node;
3086 for (i = 0; i < ndim; i++)
3090 = size_binop (MULT_EXPR, tem,
3091 size_binop (PLUS_EXPR,
3092 size_binop (MINUS_EXPR,
3093 TYPE_MAX_VALUE (idx_arr[i]),
3094 TYPE_MIN_VALUE (idx_arr[i])),
3097 fname[0] = (mech == By_Descriptor_NCA ? 'S' : 'M');
3098 fname[1] = '0' + i, fname[2] = 0;
3100 = chainon (field_list64,
3101 make_descriptor_field (fname,
3102 gnat_type_for_size (64, 1),
3103 record64_type, idx_length));
3105 if (mech == By_Descriptor_NCA)
3109 /* Finally here are the bounds. */
3110 for (i = 0; i < ndim; i++)
3114 fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0;
3116 = chainon (field_list64,
3117 make_descriptor_field
3118 (fname, gnat_type_for_size (64, 1), record64_type,
3119 TYPE_MIN_VALUE (idx_arr[i])));
3123 = chainon (field_list64,
3124 make_descriptor_field
3125 (fname, gnat_type_for_size (64, 1), record64_type,
3126 TYPE_MAX_VALUE (idx_arr[i])));
3131 post_error ("unsupported descriptor type for &", gnat_entity);
3134 TYPE_NAME (record64_type) = create_concat_name (gnat_entity, "DESC64");
3135 finish_record_type (record64_type, field_list64, 0, true);
3136 return record64_type;
3139 /* Utility routine for above code to make a field. */
3142 make_descriptor_field (const char *name, tree type,
3143 tree rec_type, tree initial)
3146 = create_field_decl (get_identifier (name), type, rec_type, 0, 0, 0, 0);
3148 DECL_INITIAL (field) = initial;
3152 /* Convert GNU_EXPR, a pointer to a 64bit VMS descriptor, to GNU_TYPE, a
3153 regular pointer or fat pointer type. GNAT_SUBPROG is the subprogram to
3154 which the VMS descriptor is passed. */
3157 convert_vms_descriptor64 (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog)
3159 tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr));
3160 tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr);
3161 /* The CLASS field is the 3rd field in the descriptor. */
3162 tree klass = TREE_CHAIN (TREE_CHAIN (TYPE_FIELDS (desc_type)));
3163 /* The POINTER field is the 6th field in the descriptor. */
3164 tree pointer64 = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (klass)));
3166 /* Retrieve the value of the POINTER field. */
3168 = build3 (COMPONENT_REF, TREE_TYPE (pointer64), desc, pointer64, NULL_TREE);
3170 if (POINTER_TYPE_P (gnu_type))
3171 return convert (gnu_type, gnu_expr64);
3173 else if (TYPE_FAT_POINTER_P (gnu_type))
3175 tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
3176 tree p_bounds_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)));
3177 tree template_type = TREE_TYPE (p_bounds_type);
3178 tree min_field = TYPE_FIELDS (template_type);
3179 tree max_field = TREE_CHAIN (TYPE_FIELDS (template_type));
3180 tree template_tree, template_addr, aflags, dimct, t, u;
3181 /* See the head comment of build_vms_descriptor. */
3182 int iklass = TREE_INT_CST_LOW (DECL_INITIAL (klass));
3183 tree lfield, ufield;
3185 /* Convert POINTER to the type of the P_ARRAY field. */
3186 gnu_expr64 = convert (p_array_type, gnu_expr64);
3190 case 1: /* Class S */
3191 case 15: /* Class SB */
3192 /* Build {1, LENGTH} template; LENGTH64 is the 5th field. */
3193 t = TREE_CHAIN (TREE_CHAIN (klass));
3194 t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3195 t = tree_cons (min_field,
3196 convert (TREE_TYPE (min_field), integer_one_node),
3197 tree_cons (max_field,
3198 convert (TREE_TYPE (max_field), t),
3200 template_tree = gnat_build_constructor (template_type, t);
3201 template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template_tree);
3203 /* For class S, we are done. */
3207 /* Test that we really have a SB descriptor, like DEC Ada. */
3208 t = build3 (COMPONENT_REF, TREE_TYPE (klass), desc, klass, NULL);
3209 u = convert (TREE_TYPE (klass), DECL_INITIAL (klass));
3210 u = build_binary_op (EQ_EXPR, integer_type_node, t, u);
3211 /* If so, there is already a template in the descriptor and
3212 it is located right after the POINTER field. The fields are
3213 64bits so they must be repacked. */
3214 t = TREE_CHAIN (pointer64);
3215 lfield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3216 lfield = convert (TREE_TYPE (TYPE_FIELDS (template_type)), lfield);
3219 ufield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3221 (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (template_type))), ufield);
3223 /* Build the template in the form of a constructor. */
3224 t = tree_cons (TYPE_FIELDS (template_type), lfield,
3225 tree_cons (TREE_CHAIN (TYPE_FIELDS (template_type)),
3226 ufield, NULL_TREE));
3227 template_tree = gnat_build_constructor (template_type, t);
3229 /* Otherwise use the {1, LENGTH} template we build above. */
3230 template_addr = build3 (COND_EXPR, p_bounds_type, u,
3231 build_unary_op (ADDR_EXPR, p_bounds_type,
3236 case 4: /* Class A */
3237 /* The AFLAGS field is the 3rd field after the pointer in the
3239 t = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (pointer64)));
3240 aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3241 /* The DIMCT field is the next field in the descriptor after
3244 dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3245 /* Raise CONSTRAINT_ERROR if either more than 1 dimension
3246 or FL_COEFF or FL_BOUNDS not set. */
3247 u = build_int_cst (TREE_TYPE (aflags), 192);
3248 u = build_binary_op (TRUTH_OR_EXPR, integer_type_node,
3249 build_binary_op (NE_EXPR, integer_type_node,
3251 convert (TREE_TYPE (dimct),
3253 build_binary_op (NE_EXPR, integer_type_node,
3254 build2 (BIT_AND_EXPR,
3258 /* There is already a template in the descriptor and it is located
3259 in block 3. The fields are 64bits so they must be repacked. */
3260 t = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (TREE_CHAIN
3262 lfield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3263 lfield = convert (TREE_TYPE (TYPE_FIELDS (template_type)), lfield);
3266 ufield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3268 (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (template_type))), ufield);
3270 /* Build the template in the form of a constructor. */
3271 t = tree_cons (TYPE_FIELDS (template_type), lfield,
3272 tree_cons (TREE_CHAIN (TYPE_FIELDS (template_type)),
3273 ufield, NULL_TREE));
3274 template_tree = gnat_build_constructor (template_type, t);
3275 template_tree = build3 (COND_EXPR, p_bounds_type, u,
3276 build_call_raise (CE_Length_Check_Failed, Empty,
3277 N_Raise_Constraint_Error),
3280 = build_unary_op (ADDR_EXPR, p_bounds_type, template_tree);
3283 case 10: /* Class NCA */
3285 post_error ("unsupported descriptor type for &", gnat_subprog);
3286 template_addr = integer_zero_node;
3290 /* Build the fat pointer in the form of a constructor. */
3291 t = tree_cons (TYPE_FIELDS (gnu_type), gnu_expr64,
3292 tree_cons (TREE_CHAIN (TYPE_FIELDS (gnu_type)),
3293 template_addr, NULL_TREE));
3294 return gnat_build_constructor (gnu_type, t);
3301 /* Convert GNU_EXPR, a pointer to a 32bit VMS descriptor, to GNU_TYPE, a
3302 regular pointer or fat pointer type. GNAT_SUBPROG is the subprogram to
3303 which the VMS descriptor is passed. */
3306 convert_vms_descriptor32 (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog)
3308 tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr));
3309 tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr);
3310 /* The CLASS field is the 3rd field in the descriptor. */
3311 tree klass = TREE_CHAIN (TREE_CHAIN (TYPE_FIELDS (desc_type)));
3312 /* The POINTER field is the 4th field in the descriptor. */
3313 tree pointer = TREE_CHAIN (klass);
3315 /* Retrieve the value of the POINTER field. */
3317 = build3 (COMPONENT_REF, TREE_TYPE (pointer), desc, pointer, NULL_TREE);
3319 if (POINTER_TYPE_P (gnu_type))
3320 return convert (gnu_type, gnu_expr32);
3322 else if (TYPE_FAT_POINTER_P (gnu_type))
3324 tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
3325 tree p_bounds_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)));
3326 tree template_type = TREE_TYPE (p_bounds_type);
3327 tree min_field = TYPE_FIELDS (template_type);
3328 tree max_field = TREE_CHAIN (TYPE_FIELDS (template_type));
3329 tree template_tree, template_addr, aflags, dimct, t, u;
3330 /* See the head comment of build_vms_descriptor. */
3331 int iklass = TREE_INT_CST_LOW (DECL_INITIAL (klass));
3333 /* Convert POINTER to the type of the P_ARRAY field. */
3334 gnu_expr32 = convert (p_array_type, gnu_expr32);
3338 case 1: /* Class S */
3339 case 15: /* Class SB */
3340 /* Build {1, LENGTH} template; LENGTH is the 1st field. */
3341 t = TYPE_FIELDS (desc_type);
3342 t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3343 t = tree_cons (min_field,
3344 convert (TREE_TYPE (min_field), integer_one_node),
3345 tree_cons (max_field,
3346 convert (TREE_TYPE (max_field), t),
3348 template_tree = gnat_build_constructor (template_type, t);
3349 template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template_tree);
3351 /* For class S, we are done. */
3355 /* Test that we really have a SB descriptor, like DEC Ada. */
3356 t = build3 (COMPONENT_REF, TREE_TYPE (klass), desc, klass, NULL);
3357 u = convert (TREE_TYPE (klass), DECL_INITIAL (klass));
3358 u = build_binary_op (EQ_EXPR, integer_type_node, t, u);
3359 /* If so, there is already a template in the descriptor and
3360 it is located right after the POINTER field. */
3361 t = TREE_CHAIN (pointer);
3363 = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3364 /* Otherwise use the {1, LENGTH} template we build above. */
3365 template_addr = build3 (COND_EXPR, p_bounds_type, u,
3366 build_unary_op (ADDR_EXPR, p_bounds_type,
3371 case 4: /* Class A */
3372 /* The AFLAGS field is the 7th field in the descriptor. */
3373 t = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (pointer)));
3374 aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3375 /* The DIMCT field is the 8th field in the descriptor. */
3377 dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3378 /* Raise CONSTRAINT_ERROR if either more than 1 dimension
3379 or FL_COEFF or FL_BOUNDS not set. */
3380 u = build_int_cst (TREE_TYPE (aflags), 192);
3381 u = build_binary_op (TRUTH_OR_EXPR, integer_type_node,
3382 build_binary_op (NE_EXPR, integer_type_node,
3384 convert (TREE_TYPE (dimct),
3386 build_binary_op (NE_EXPR, integer_type_node,
3387 build2 (BIT_AND_EXPR,
3391 /* There is already a template in the descriptor and it is
3392 located at the start of block 3 (12th field). */
3393 t = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (t))));
3395 = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE);
3396 template_tree = build3 (COND_EXPR, p_bounds_type, u,
3397 build_call_raise (CE_Length_Check_Failed, Empty,
3398 N_Raise_Constraint_Error),
3401 = build_unary_op (ADDR_EXPR, p_bounds_type, template_tree);
3404 case 10: /* Class NCA */
3406 post_error ("unsupported descriptor type for &", gnat_subprog);
3407 template_addr = integer_zero_node;
3411 /* Build the fat pointer in the form of a constructor. */
3412 t = tree_cons (TYPE_FIELDS (gnu_type), gnu_expr32,
3413 tree_cons (TREE_CHAIN (TYPE_FIELDS (gnu_type)),
3414 template_addr, NULL_TREE));
3416 return gnat_build_constructor (gnu_type, t);
3423 /* Convert GNU_EXPR, a pointer to a VMS descriptor, to GNU_TYPE, a regular
3424 pointer or fat pointer type. GNU_EXPR_ALT_TYPE is the alternate (32-bit)
3425 pointer type of GNU_EXPR. GNAT_SUBPROG is the subprogram to which the
3426 VMS descriptor is passed. */
3429 convert_vms_descriptor (tree gnu_type, tree gnu_expr, tree gnu_expr_alt_type,
3430 Entity_Id gnat_subprog)
3432 tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr));
3433 tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr);
3434 tree mbo = TYPE_FIELDS (desc_type);
3435 const char *mbostr = IDENTIFIER_POINTER (DECL_NAME (mbo));
3436 tree mbmo = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (mbo)));
3437 tree is64bit, gnu_expr32, gnu_expr64;
3439 /* If the field name is not MBO, it must be 32-bit and no alternate.
3440 Otherwise primary must be 64-bit and alternate 32-bit. */
3441 if (strcmp (mbostr, "MBO") != 0)
3442 return convert_vms_descriptor32 (gnu_type, gnu_expr, gnat_subprog);
3444 /* Build the test for 64-bit descriptor. */
3445 mbo = build3 (COMPONENT_REF, TREE_TYPE (mbo), desc, mbo, NULL_TREE);
3446 mbmo = build3 (COMPONENT_REF, TREE_TYPE (mbmo), desc, mbmo, NULL_TREE);
3448 = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node,
3449 build_binary_op (EQ_EXPR, integer_type_node,
3450 convert (integer_type_node, mbo),
3452 build_binary_op (EQ_EXPR, integer_type_node,
3453 convert (integer_type_node, mbmo),
3454 integer_minus_one_node));
3456 /* Build the 2 possible end results. */
3457 gnu_expr64 = convert_vms_descriptor64 (gnu_type, gnu_expr, gnat_subprog);
3458 gnu_expr = fold_convert (gnu_expr_alt_type, gnu_expr);
3459 gnu_expr32 = convert_vms_descriptor32 (gnu_type, gnu_expr, gnat_subprog);
3461 return build3 (COND_EXPR, gnu_type, is64bit, gnu_expr64, gnu_expr32);
3464 /* Build a stub for the subprogram specified by the GCC tree GNU_SUBPROG
3465 and the GNAT node GNAT_SUBPROG. */
3468 build_function_stub (tree gnu_subprog, Entity_Id gnat_subprog)
3470 tree gnu_subprog_type, gnu_subprog_addr, gnu_subprog_call;
3471 tree gnu_stub_param, gnu_param_list, gnu_arg_types, gnu_param;
3472 tree gnu_stub_decl = DECL_FUNCTION_STUB (gnu_subprog);
3475 gnu_subprog_type = TREE_TYPE (gnu_subprog);
3476 gnu_param_list = NULL_TREE;
3478 begin_subprog_body (gnu_stub_decl);
3481 start_stmt_group ();
3483 /* Loop over the parameters of the stub and translate any of them
3484 passed by descriptor into a by reference one. */
3485 for (gnu_stub_param = DECL_ARGUMENTS (gnu_stub_decl),
3486 gnu_arg_types = TYPE_ARG_TYPES (gnu_subprog_type);
3488 gnu_stub_param = TREE_CHAIN (gnu_stub_param),
3489 gnu_arg_types = TREE_CHAIN (gnu_arg_types))
3491 if (DECL_BY_DESCRIPTOR_P (gnu_stub_param))
3493 = convert_vms_descriptor (TREE_VALUE (gnu_arg_types),
3495 DECL_PARM_ALT_TYPE (gnu_stub_param),
3498 gnu_param = gnu_stub_param;
3500 gnu_param_list = tree_cons (NULL_TREE, gnu_param, gnu_param_list);
3503 gnu_body = end_stmt_group ();
3505 /* Invoke the internal subprogram. */
3506 gnu_subprog_addr = build1 (ADDR_EXPR, build_pointer_type (gnu_subprog_type),
3508 gnu_subprog_call = build_call_list (TREE_TYPE (gnu_subprog_type),
3510 nreverse (gnu_param_list));
3512 /* Propagate the return value, if any. */
3513 if (VOID_TYPE_P (TREE_TYPE (gnu_subprog_type)))
3514 append_to_statement_list (gnu_subprog_call, &gnu_body);
3516 append_to_statement_list (build_return_expr (DECL_RESULT (gnu_stub_decl),
3522 allocate_struct_function (gnu_stub_decl, false);
3523 end_subprog_body (gnu_body, false);
3526 /* Build a type to be used to represent an aliased object whose nominal
3527 type is an unconstrained array. This consists of a RECORD_TYPE containing
3528 a field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an
3529 ARRAY_TYPE. If ARRAY_TYPE is that of the unconstrained array, this
3530 is used to represent an arbitrary unconstrained object. Use NAME
3531 as the name of the record. */
3534 build_unc_object_type (tree template_type, tree object_type, tree name)
3536 tree type = make_node (RECORD_TYPE);
3537 tree template_field = create_field_decl (get_identifier ("BOUNDS"),
3538 template_type, type, 0, 0, 0, 1);
3539 tree array_field = create_field_decl (get_identifier ("ARRAY"), object_type,
3542 TYPE_NAME (type) = name;
3543 TYPE_CONTAINS_TEMPLATE_P (type) = 1;
3544 finish_record_type (type,
3545 chainon (chainon (NULL_TREE, template_field),
3552 /* Same, taking a thin or fat pointer type instead of a template type. */
3555 build_unc_object_type_from_ptr (tree thin_fat_ptr_type, tree object_type,
3560 gcc_assert (TYPE_FAT_OR_THIN_POINTER_P (thin_fat_ptr_type));
3563 = (TYPE_FAT_POINTER_P (thin_fat_ptr_type)
3564 ? TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (thin_fat_ptr_type))))
3565 : TREE_TYPE (TYPE_FIELDS (TREE_TYPE (thin_fat_ptr_type))));
3566 return build_unc_object_type (template_type, object_type, name);
3569 /* Shift the component offsets within an unconstrained object TYPE to make it
3570 suitable for use as a designated type for thin pointers. */
3573 shift_unc_components_for_thin_pointers (tree type)
3575 /* Thin pointer values designate the ARRAY data of an unconstrained object,
3576 allocated past the BOUNDS template. The designated type is adjusted to
3577 have ARRAY at position zero and the template at a negative offset, so
3578 that COMPONENT_REFs on (*thin_ptr) designate the proper location. */
3580 tree bounds_field = TYPE_FIELDS (type);
3581 tree array_field = TREE_CHAIN (TYPE_FIELDS (type));
3583 DECL_FIELD_OFFSET (bounds_field)
3584 = size_binop (MINUS_EXPR, size_zero_node, byte_position (array_field));
3586 DECL_FIELD_OFFSET (array_field) = size_zero_node;
3587 DECL_FIELD_BIT_OFFSET (array_field) = bitsize_zero_node;
3590 /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE.
3591 In the normal case this is just two adjustments, but we have more to
3592 do if NEW_TYPE is an UNCONSTRAINED_ARRAY_TYPE. */
3595 update_pointer_to (tree old_type, tree new_type)
3597 tree ptr = TYPE_POINTER_TO (old_type);
3598 tree ref = TYPE_REFERENCE_TO (old_type);
3602 /* If this is the main variant, process all the other variants first. */
3603 if (TYPE_MAIN_VARIANT (old_type) == old_type)
3604 for (type = TYPE_NEXT_VARIANT (old_type); type;
3605 type = TYPE_NEXT_VARIANT (type))
3606 update_pointer_to (type, new_type);
3608 /* If no pointers and no references, we are done. */
3612 /* Merge the old type qualifiers in the new type.
3614 Each old variant has qualifiers for specific reasons, and the new
3615 designated type as well. Each set of qualifiers represents useful
3616 information grabbed at some point, and merging the two simply unifies
3617 these inputs into the final type description.
3619 Consider for instance a volatile type frozen after an access to constant
3620 type designating it; after the designated type's freeze, we get here with
3621 a volatile NEW_TYPE and a dummy OLD_TYPE with a readonly variant, created
3622 when the access type was processed. We will make a volatile and readonly
3623 designated type, because that's what it really is.
3625 We might also get here for a non-dummy OLD_TYPE variant with different
3626 qualifiers than those of NEW_TYPE, for instance in some cases of pointers
3627 to private record type elaboration (see the comments around the call to
3628 this routine in gnat_to_gnu_entity <E_Access_Type>). We have to merge
3629 the qualifiers in those cases too, to avoid accidentally discarding the
3630 initial set, and will often end up with OLD_TYPE == NEW_TYPE then. */
3632 = build_qualified_type (new_type,
3633 TYPE_QUALS (old_type) | TYPE_QUALS (new_type));
3635 /* If old type and new type are identical, there is nothing to do. */
3636 if (old_type == new_type)
3639 /* Otherwise, first handle the simple case. */
3640 if (TREE_CODE (new_type) != UNCONSTRAINED_ARRAY_TYPE)
3642 TYPE_POINTER_TO (new_type) = ptr;
3643 TYPE_REFERENCE_TO (new_type) = ref;
3645 for (; ptr; ptr = TYPE_NEXT_PTR_TO (ptr))
3646 for (ptr1 = TYPE_MAIN_VARIANT (ptr); ptr1;
3647 ptr1 = TYPE_NEXT_VARIANT (ptr1))
3648 TREE_TYPE (ptr1) = new_type;
3650 for (; ref; ref = TYPE_NEXT_REF_TO (ref))
3651 for (ref1 = TYPE_MAIN_VARIANT (ref); ref1;
3652 ref1 = TYPE_NEXT_VARIANT (ref1))
3653 TREE_TYPE (ref1) = new_type;
3656 /* Now deal with the unconstrained array case. In this case the "pointer"
3657 is actually a RECORD_TYPE where both fields are pointers to dummy nodes.
3658 Turn them into pointers to the correct types using update_pointer_to. */
3659 else if (!TYPE_FAT_POINTER_P (ptr))
3664 tree new_obj_rec = TYPE_OBJECT_RECORD_TYPE (new_type);
3665 tree array_field = TYPE_FIELDS (ptr);
3666 tree bounds_field = TREE_CHAIN (TYPE_FIELDS (ptr));
3667 tree new_ptr = TYPE_POINTER_TO (new_type);
3671 /* Make pointers to the dummy template point to the real template. */
3673 (TREE_TYPE (TREE_TYPE (bounds_field)),
3674 TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (new_ptr)))));
3676 /* The references to the template bounds present in the array type
3677 are made through a PLACEHOLDER_EXPR of type NEW_PTR. Since we
3678 are updating PTR to make it a full replacement for NEW_PTR as
3679 pointer to NEW_TYPE, we must rework the PLACEHOLDER_EXPR so as
3680 to make it of type PTR. */
3681 new_ref = build3 (COMPONENT_REF, TREE_TYPE (bounds_field),
3682 build0 (PLACEHOLDER_EXPR, ptr),
3683 bounds_field, NULL_TREE);
3685 /* Create the new array for the new PLACEHOLDER_EXPR and make pointers
3686 to the dummy array point to it. */
3688 (TREE_TYPE (TREE_TYPE (array_field)),
3689 substitute_in_type (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (new_ptr))),
3690 TREE_CHAIN (TYPE_FIELDS (new_ptr)), new_ref));
3692 /* Make PTR the pointer to NEW_TYPE. */
3693 TYPE_POINTER_TO (new_type) = TYPE_REFERENCE_TO (new_type)
3694 = TREE_TYPE (new_type) = ptr;
3696 for (var = TYPE_MAIN_VARIANT (ptr); var; var = TYPE_NEXT_VARIANT (var))
3697 SET_TYPE_UNCONSTRAINED_ARRAY (var, new_type);
3699 /* Now handle updating the allocation record, what the thin pointer
3700 points to. Update all pointers from the old record into the new
3701 one, update the type of the array field, and recompute the size. */
3702 update_pointer_to (TYPE_OBJECT_RECORD_TYPE (old_type), new_obj_rec);
3704 TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (new_obj_rec)))
3705 = TREE_TYPE (TREE_TYPE (array_field));
3707 /* The size recomputation needs to account for alignment constraints, so
3708 we let layout_type work it out. This will reset the field offsets to
3709 what they would be in a regular record, so we shift them back to what
3710 we want them to be for a thin pointer designated type afterwards. */
3711 DECL_SIZE (TYPE_FIELDS (new_obj_rec)) = 0;
3712 DECL_SIZE (TREE_CHAIN (TYPE_FIELDS (new_obj_rec))) = 0;
3713 TYPE_SIZE (new_obj_rec) = 0;
3714 layout_type (new_obj_rec);
3716 shift_unc_components_for_thin_pointers (new_obj_rec);
3718 /* We are done, at last. */
3719 rest_of_record_type_compilation (ptr);
3723 /* Convert EXPR, a pointer to a constrained array, into a pointer to an
3724 unconstrained one. This involves making or finding a template. */
3727 convert_to_fat_pointer (tree type, tree expr)
3729 tree template_type = TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (type))));
3730 tree p_array_type = TREE_TYPE (TYPE_FIELDS (type));
3731 tree etype = TREE_TYPE (expr);
3734 /* If EXPR is null, make a fat pointer that contains null pointers to the
3735 template and array. */
3736 if (integer_zerop (expr))
3738 gnat_build_constructor
3740 tree_cons (TYPE_FIELDS (type),
3741 convert (p_array_type, expr),
3742 tree_cons (TREE_CHAIN (TYPE_FIELDS (type)),
3743 convert (build_pointer_type (template_type),
3747 /* If EXPR is a thin pointer, make template and data from the record.. */
3748 else if (TYPE_THIN_POINTER_P (etype))
3750 tree fields = TYPE_FIELDS (TREE_TYPE (etype));
3752 expr = save_expr (expr);
3753 if (TREE_CODE (expr) == ADDR_EXPR)
3754 expr = TREE_OPERAND (expr, 0);
3756 expr = build1 (INDIRECT_REF, TREE_TYPE (etype), expr);
3758 template_tree = build_component_ref (expr, NULL_TREE, fields, false);
3759 expr = build_unary_op (ADDR_EXPR, NULL_TREE,
3760 build_component_ref (expr, NULL_TREE,
3761 TREE_CHAIN (fields), false));
3764 /* Otherwise, build the constructor for the template. */
3766 template_tree = build_template (template_type, TREE_TYPE (etype), expr);
3768 /* The final result is a constructor for the fat pointer.
3770 If EXPR is an argument of a foreign convention subprogram, the type it
3771 points to is directly the component type. In this case, the expression
3772 type may not match the corresponding FIELD_DECL type at this point, so we
3773 call "convert" here to fix that up if necessary. This type consistency is
3774 required, for instance because it ensures that possible later folding of
3775 COMPONENT_REFs against this constructor always yields something of the
3776 same type as the initial reference.
3778 Note that the call to "build_template" above is still fine because it
3779 will only refer to the provided TEMPLATE_TYPE in this case. */
3781 gnat_build_constructor
3783 tree_cons (TYPE_FIELDS (type),
3784 convert (p_array_type, expr),
3785 tree_cons (TREE_CHAIN (TYPE_FIELDS (type)),
3786 build_unary_op (ADDR_EXPR, NULL_TREE,
3791 /* Convert to a thin pointer type, TYPE. The only thing we know how to convert
3792 is something that is a fat pointer, so convert to it first if it EXPR
3793 is not already a fat pointer. */
3796 convert_to_thin_pointer (tree type, tree expr)
3798 if (!TYPE_FAT_POINTER_P (TREE_TYPE (expr)))
3800 = convert_to_fat_pointer
3801 (TREE_TYPE (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))), expr);
3803 /* We get the pointer to the data and use a NOP_EXPR to make it the
3805 expr = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (TREE_TYPE (expr)),
3807 expr = build1 (NOP_EXPR, type, expr);
3812 /* Create an expression whose value is that of EXPR,
3813 converted to type TYPE. The TREE_TYPE of the value
3814 is always TYPE. This function implements all reasonable
3815 conversions; callers should filter out those that are
3816 not permitted by the language being compiled. */
3819 convert (tree type, tree expr)
3821 enum tree_code code = TREE_CODE (type);
3822 tree etype = TREE_TYPE (expr);
3823 enum tree_code ecode = TREE_CODE (etype);
3825 /* If EXPR is already the right type, we are done. */
3829 /* If both input and output have padding and are of variable size, do this
3830 as an unchecked conversion. Likewise if one is a mere variant of the
3831 other, so we avoid a pointless unpad/repad sequence. */
3832 else if (code == RECORD_TYPE && ecode == RECORD_TYPE
3833 && TYPE_IS_PADDING_P (type) && TYPE_IS_PADDING_P (etype)
3834 && (!TREE_CONSTANT (TYPE_SIZE (type))
3835 || !TREE_CONSTANT (TYPE_SIZE (etype))
3836 || gnat_types_compatible_p (type, etype)
3837 || TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type)))
3838 == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (etype)))))
3841 /* If the output type has padding, convert to the inner type and
3842 make a constructor to build the record. */
3843 else if (code == RECORD_TYPE && TYPE_IS_PADDING_P (type))
3845 /* If we previously converted from another type and our type is
3846 of variable size, remove the conversion to avoid the need for
3847 variable-size temporaries. Likewise for a conversion between
3848 original and packable version. */
3849 if (TREE_CODE (expr) == VIEW_CONVERT_EXPR
3850 && (!TREE_CONSTANT (TYPE_SIZE (type))
3851 || (ecode == RECORD_TYPE
3852 && TYPE_NAME (etype)
3853 == TYPE_NAME (TREE_TYPE (TREE_OPERAND (expr, 0))))))
3854 expr = TREE_OPERAND (expr, 0);
3856 /* If we are just removing the padding from expr, convert the original
3857 object if we have variable size in order to avoid the need for some
3858 variable-size temporaries. Likewise if the padding is a mere variant
3859 of the other, so we avoid a pointless unpad/repad sequence. */
3860 if (TREE_CODE (expr) == COMPONENT_REF
3861 && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == RECORD_TYPE
3862 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (expr, 0)))
3863 && (!TREE_CONSTANT (TYPE_SIZE (type))
3864 || gnat_types_compatible_p (type,
3865 TREE_TYPE (TREE_OPERAND (expr, 0)))
3866 || (ecode == RECORD_TYPE
3867 && TYPE_NAME (etype)
3868 == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type))))))
3869 return convert (type, TREE_OPERAND (expr, 0));
3871 /* If the result type is a padded type with a self-referentially-sized
3872 field and the expression type is a record, do this as an
3873 unchecked conversion. */
3874 else if (TREE_CODE (etype) == RECORD_TYPE
3875 && CONTAINS_PLACEHOLDER_P (DECL_SIZE (TYPE_FIELDS (type))))
3876 return unchecked_convert (type, expr, false);
3880 gnat_build_constructor (type,
3881 tree_cons (TYPE_FIELDS (type),
3883 (TYPE_FIELDS (type)),
3888 /* If the input type has padding, remove it and convert to the output type.
3889 The conditions ordering is arranged to ensure that the output type is not
3890 a padding type here, as it is not clear whether the conversion would
3891 always be correct if this was to happen. */
3892 else if (ecode == RECORD_TYPE && TYPE_IS_PADDING_P (etype))
3896 /* If we have just converted to this padded type, just get the
3897 inner expression. */
3898 if (TREE_CODE (expr) == CONSTRUCTOR
3899 && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (expr))
3900 && VEC_index (constructor_elt, CONSTRUCTOR_ELTS (expr), 0)->index
3901 == TYPE_FIELDS (etype))
3903 = VEC_index (constructor_elt, CONSTRUCTOR_ELTS (expr), 0)->value;
3905 /* Otherwise, build an explicit component reference. */
3908 = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (etype), false);
3910 return convert (type, unpadded);
3913 /* If the input is a biased type, adjust first. */
3914 if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype))
3915 return convert (type, fold_build2 (PLUS_EXPR, TREE_TYPE (etype),
3916 fold_convert (TREE_TYPE (etype),
3918 TYPE_MIN_VALUE (etype)));
3920 /* If the input is a justified modular type, we need to extract the actual
3921 object before converting it to any other type with the exceptions of an
3922 unconstrained array or of a mere type variant. It is useful to avoid the
3923 extraction and conversion in the type variant case because it could end
3924 up replacing a VAR_DECL expr by a constructor and we might be about the
3925 take the address of the result. */
3926 if (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype)
3927 && code != UNCONSTRAINED_ARRAY_TYPE
3928 && TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (etype))
3929 return convert (type, build_component_ref (expr, NULL_TREE,
3930 TYPE_FIELDS (etype), false));
3932 /* If converting to a type that contains a template, convert to the data
3933 type and then build the template. */
3934 if (code == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (type))
3936 tree obj_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (type)));
3938 /* If the source already has a template, get a reference to the
3939 associated array only, as we are going to rebuild a template
3940 for the target type anyway. */
3941 expr = maybe_unconstrained_array (expr);
3944 gnat_build_constructor
3946 tree_cons (TYPE_FIELDS (type),
3947 build_template (TREE_TYPE (TYPE_FIELDS (type)),
3948 obj_type, NULL_TREE),
3949 tree_cons (TREE_CHAIN (TYPE_FIELDS (type)),
3950 convert (obj_type, expr), NULL_TREE)));
3953 /* There are some special cases of expressions that we process
3955 switch (TREE_CODE (expr))
3961 /* Just set its type here. For TRANSFORM_EXPR, we will do the actual
3962 conversion in gnat_expand_expr. NULL_EXPR does not represent
3963 and actual value, so no conversion is needed. */
3964 expr = copy_node (expr);
3965 TREE_TYPE (expr) = type;
3969 /* If we are converting a STRING_CST to another constrained array type,
3970 just make a new one in the proper type. */
3971 if (code == ecode && AGGREGATE_TYPE_P (etype)
3972 && !(TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST
3973 && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST))
3975 expr = copy_node (expr);
3976 TREE_TYPE (expr) = type;
3982 /* If we are converting a CONSTRUCTOR to a mere variant type, just make
3983 a new one in the proper type. */
3984 if (code == ecode && gnat_types_compatible_p (type, etype))
3986 expr = copy_node (expr);
3987 TREE_TYPE (expr) = type;
3991 /* Likewise for a conversion between original and packable version, but
3992 we have to work harder in order to preserve type consistency. */
3994 && code == RECORD_TYPE
3995 && TYPE_NAME (type) == TYPE_NAME (etype))
3997 VEC(constructor_elt,gc) *e = CONSTRUCTOR_ELTS (expr);
3998 unsigned HOST_WIDE_INT len = VEC_length (constructor_elt, e);
3999 VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, len);
4000 tree efield = TYPE_FIELDS (etype), field = TYPE_FIELDS (type);
4001 unsigned HOST_WIDE_INT idx;
4004 /* Whether we need to clear TREE_CONSTANT et al. on the output
4005 constructor when we convert in place. */
4006 bool clear_constant = false;
4008 FOR_EACH_CONSTRUCTOR_ELT(e, idx, index, value)
4010 constructor_elt *elt = VEC_quick_push (constructor_elt, v, NULL);
4011 /* We expect only simple constructors. Otherwise, punt. */
4012 if (!(index == efield || index == DECL_ORIGINAL_FIELD (efield)))
4015 elt->value = convert (TREE_TYPE (field), value);
4017 /* If packing has made this field a bitfield and the input
4018 value couldn't be emitted statically any more, we need to
4019 clear TREE_CONSTANT on our output. */
4020 if (!clear_constant && TREE_CONSTANT (expr)
4021 && !CONSTRUCTOR_BITFIELD_P (efield)
4022 && CONSTRUCTOR_BITFIELD_P (field)
4023 && !initializer_constant_valid_for_bitfield_p (value))
4024 clear_constant = true;
4026 efield = TREE_CHAIN (efield);
4027 field = TREE_CHAIN (field);
4030 /* If we have been able to match and convert all the input fields
4031 to their output type, convert in place now. We'll fallback to a
4032 view conversion downstream otherwise. */
4035 expr = copy_node (expr);
4036 TREE_TYPE (expr) = type;
4037 CONSTRUCTOR_ELTS (expr) = v;
4039 TREE_CONSTANT (expr) = TREE_STATIC (expr) = false;
4045 case UNCONSTRAINED_ARRAY_REF:
4046 /* Convert this to the type of the inner array by getting the address of
4047 the array from the template. */
4048 expr = build_unary_op (INDIRECT_REF, NULL_TREE,
4049 build_component_ref (TREE_OPERAND (expr, 0),
4050 get_identifier ("P_ARRAY"),
4052 etype = TREE_TYPE (expr);
4053 ecode = TREE_CODE (etype);
4056 case VIEW_CONVERT_EXPR:
4058 /* GCC 4.x is very sensitive to type consistency overall, and view
4059 conversions thus are very frequent. Even though just "convert"ing
4060 the inner operand to the output type is fine in most cases, it
4061 might expose unexpected input/output type mismatches in special
4062 circumstances so we avoid such recursive calls when we can. */
4063 tree op0 = TREE_OPERAND (expr, 0);
4065 /* If we are converting back to the original type, we can just
4066 lift the input conversion. This is a common occurrence with
4067 switches back-and-forth amongst type variants. */
4068 if (type == TREE_TYPE (op0))
4071 /* Otherwise, if we're converting between two aggregate types, we
4072 might be allowed to substitute the VIEW_CONVERT_EXPR target type
4073 in place or to just convert the inner expression. */
4074 if (AGGREGATE_TYPE_P (type) && AGGREGATE_TYPE_P (etype))
4076 /* If we are converting between mere variants, we can just
4077 substitute the VIEW_CONVERT_EXPR in place. */
4078 if (gnat_types_compatible_p (type, etype))
4079 return build1 (VIEW_CONVERT_EXPR, type, op0);
4081 /* Otherwise, we may just bypass the input view conversion unless
4082 one of the types is a fat pointer, which is handled by
4083 specialized code below which relies on exact type matching. */
4084 else if (!TYPE_FAT_POINTER_P (type) && !TYPE_FAT_POINTER_P (etype))
4085 return convert (type, op0);
4091 /* If both types are record types, just convert the pointer and
4092 make a new INDIRECT_REF.
4094 ??? Disable this for now since it causes problems with the
4095 code in build_binary_op for MODIFY_EXPR which wants to
4096 strip off conversions. But that code really is a mess and
4097 we need to do this a much better way some time. */
4099 && (TREE_CODE (type) == RECORD_TYPE
4100 || TREE_CODE (type) == UNION_TYPE)
4101 && (TREE_CODE (etype) == RECORD_TYPE
4102 || TREE_CODE (etype) == UNION_TYPE)
4103 && !TYPE_FAT_POINTER_P (type) && !TYPE_FAT_POINTER_P (etype))
4104 return build_unary_op (INDIRECT_REF, NULL_TREE,
4105 convert (build_pointer_type (type),
4106 TREE_OPERAND (expr, 0)));
4113 /* Check for converting to a pointer to an unconstrained array. */
4114 if (TYPE_FAT_POINTER_P (type) && !TYPE_FAT_POINTER_P (etype))
4115 return convert_to_fat_pointer (type, expr);
4117 /* If we are converting between two aggregate types that are mere
4118 variants, just make a VIEW_CONVERT_EXPR. */
4119 else if (code == ecode
4120 && AGGREGATE_TYPE_P (type)
4121 && gnat_types_compatible_p (type, etype))
4122 return build1 (VIEW_CONVERT_EXPR, type, expr);
4124 /* In all other cases of related types, make a NOP_EXPR. */
4125 else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (etype)
4126 || (code == INTEGER_CST && ecode == INTEGER_CST
4127 && (type == TREE_TYPE (etype) || etype == TREE_TYPE (type))))
4128 return fold_convert (type, expr);
4133 return fold_build1 (CONVERT_EXPR, type, expr);
4136 if (TYPE_HAS_ACTUAL_BOUNDS_P (type)
4137 && (ecode == ARRAY_TYPE || ecode == UNCONSTRAINED_ARRAY_TYPE
4138 || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype))))
4139 return unchecked_convert (type, expr, false);
4140 else if (TYPE_BIASED_REPRESENTATION_P (type))
4141 return fold_convert (type,
4142 fold_build2 (MINUS_EXPR, TREE_TYPE (type),
4143 convert (TREE_TYPE (type), expr),
4144 TYPE_MIN_VALUE (type)));
4146 /* ... fall through ... */
4150 /* If we are converting an additive expression to an integer type
4151 with lower precision, be wary of the optimization that can be
4152 applied by convert_to_integer. There are 2 problematic cases:
4153 - if the first operand was originally of a biased type,
4154 because we could be recursively called to convert it
4155 to an intermediate type and thus rematerialize the
4156 additive operator endlessly,
4157 - if the expression contains a placeholder, because an
4158 intermediate conversion that changes the sign could
4159 be inserted and thus introduce an artificial overflow
4160 at compile time when the placeholder is substituted. */
4161 if (code == INTEGER_TYPE
4162 && ecode == INTEGER_TYPE
4163 && TYPE_PRECISION (type) < TYPE_PRECISION (etype)
4164 && (TREE_CODE (expr) == PLUS_EXPR || TREE_CODE (expr) == MINUS_EXPR))
4166 tree op0 = get_unwidened (TREE_OPERAND (expr, 0), type);
4168 if ((TREE_CODE (TREE_TYPE (op0)) == INTEGER_TYPE
4169 && TYPE_BIASED_REPRESENTATION_P (TREE_TYPE (op0)))
4170 || CONTAINS_PLACEHOLDER_P (expr))
4171 return build1 (NOP_EXPR, type, expr);
4174 return fold (convert_to_integer (type, expr));
4177 case REFERENCE_TYPE:
4178 /* If converting between two pointers to records denoting
4179 both a template and type, adjust if needed to account
4180 for any differing offsets, since one might be negative. */
4181 if (TYPE_THIN_POINTER_P (etype) && TYPE_THIN_POINTER_P (type))
4184 = size_diffop (bit_position (TYPE_FIELDS (TREE_TYPE (etype))),
4185 bit_position (TYPE_FIELDS (TREE_TYPE (type))));
4186 tree byte_diff = size_binop (CEIL_DIV_EXPR, bit_diff,
4187 sbitsize_int (BITS_PER_UNIT));
4189 expr = build1 (NOP_EXPR, type, expr);
4190 TREE_CONSTANT (expr) = TREE_CONSTANT (TREE_OPERAND (expr, 0));
4191 if (integer_zerop (byte_diff))
4194 return build_binary_op (POINTER_PLUS_EXPR, type, expr,
4195 fold (convert (sizetype, byte_diff)));
4198 /* If converting to a thin pointer, handle specially. */
4199 if (TYPE_THIN_POINTER_P (type)
4200 && TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)))
4201 return convert_to_thin_pointer (type, expr);
4203 /* If converting fat pointer to normal pointer, get the pointer to the
4204 array and then convert it. */
4205 else if (TYPE_FAT_POINTER_P (etype))
4206 expr = build_component_ref (expr, get_identifier ("P_ARRAY"),
4209 return fold (convert_to_pointer (type, expr));
4212 return fold (convert_to_real (type, expr));
4215 if (TYPE_JUSTIFIED_MODULAR_P (type) && !AGGREGATE_TYPE_P (etype))
4217 gnat_build_constructor
4218 (type, tree_cons (TYPE_FIELDS (type),
4219 convert (TREE_TYPE (TYPE_FIELDS (type)), expr),
4222 /* ... fall through ... */
4225 /* In these cases, assume the front-end has validated the conversion.
4226 If the conversion is valid, it will be a bit-wise conversion, so
4227 it can be viewed as an unchecked conversion. */
4228 return unchecked_convert (type, expr, false);
4231 /* This is a either a conversion between a tagged type and some
4232 subtype, which we have to mark as a UNION_TYPE because of
4233 overlapping fields or a conversion of an Unchecked_Union. */
4234 return unchecked_convert (type, expr, false);
4236 case UNCONSTRAINED_ARRAY_TYPE:
4237 /* If EXPR is a constrained array, take its address, convert it to a
4238 fat pointer, and then dereference it. Likewise if EXPR is a
4239 record containing both a template and a constrained array.
4240 Note that a record representing a justified modular type
4241 always represents a packed constrained array. */
4242 if (ecode == ARRAY_TYPE
4243 || (ecode == INTEGER_TYPE && TYPE_HAS_ACTUAL_BOUNDS_P (etype))
4244 || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype))
4245 || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype)))
4248 (INDIRECT_REF, NULL_TREE,
4249 convert_to_fat_pointer (TREE_TYPE (type),
4250 build_unary_op (ADDR_EXPR,
4253 /* Do something very similar for converting one unconstrained
4254 array to another. */
4255 else if (ecode == UNCONSTRAINED_ARRAY_TYPE)
4257 build_unary_op (INDIRECT_REF, NULL_TREE,
4258 convert (TREE_TYPE (type),
4259 build_unary_op (ADDR_EXPR,
4265 return fold (convert_to_complex (type, expr));
4272 /* Remove all conversions that are done in EXP. This includes converting
4273 from a padded type or to a justified modular type. If TRUE_ADDRESS
4274 is true, always return the address of the containing object even if
4275 the address is not bit-aligned. */
4278 remove_conversions (tree exp, bool true_address)
4280 switch (TREE_CODE (exp))
4284 && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
4285 && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (exp)))
4287 remove_conversions (VEC_index (constructor_elt,
4288 CONSTRUCTOR_ELTS (exp), 0)->value,
4293 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == RECORD_TYPE
4294 && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
4295 return remove_conversions (TREE_OPERAND (exp, 0), true_address);
4298 case VIEW_CONVERT_EXPR: case NON_LVALUE_EXPR:
4300 return remove_conversions (TREE_OPERAND (exp, 0), true_address);
4309 /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that
4310 refers to the underlying array. If its type has TYPE_CONTAINS_TEMPLATE_P,
4311 likewise return an expression pointing to the underlying array. */
4314 maybe_unconstrained_array (tree exp)
4316 enum tree_code code = TREE_CODE (exp);
4319 switch (TREE_CODE (TREE_TYPE (exp)))
4321 case UNCONSTRAINED_ARRAY_TYPE:
4322 if (code == UNCONSTRAINED_ARRAY_REF)
4325 = build_unary_op (INDIRECT_REF, NULL_TREE,
4326 build_component_ref (TREE_OPERAND (exp, 0),
4327 get_identifier ("P_ARRAY"),
4329 TREE_READONLY (new_exp) = TREE_STATIC (new_exp)
4330 = TREE_READONLY (exp);
4334 else if (code == NULL_EXPR)
4335 return build1 (NULL_EXPR,
4336 TREE_TYPE (TREE_TYPE (TYPE_FIELDS
4337 (TREE_TYPE (TREE_TYPE (exp))))),
4338 TREE_OPERAND (exp, 0));
4341 /* If this is a padded type, convert to the unpadded type and see if
4342 it contains a template. */
4343 if (TYPE_IS_PADDING_P (TREE_TYPE (exp)))
4345 new_exp = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp);
4346 if (TREE_CODE (TREE_TYPE (new_exp)) == RECORD_TYPE
4347 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (new_exp)))
4349 build_component_ref (new_exp, NULL_TREE,
4351 (TYPE_FIELDS (TREE_TYPE (new_exp))),
4354 else if (TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (exp)))
4356 build_component_ref (exp, NULL_TREE,
4357 TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (exp))), 0);
4367 /* Return true if EXPR is an expression that can be folded as an operand
4368 of a VIEW_CONVERT_EXPR. See ada-tree.h for a complete rationale. */
4371 can_fold_for_view_convert_p (tree expr)
4375 /* The folder will fold NOP_EXPRs between integral types with the same
4376 precision (in the middle-end's sense). We cannot allow it if the
4377 types don't have the same precision in the Ada sense as well. */
4378 if (TREE_CODE (expr) != NOP_EXPR)
4381 t1 = TREE_TYPE (expr);
4382 t2 = TREE_TYPE (TREE_OPERAND (expr, 0));
4384 /* Defer to the folder for non-integral conversions. */
4385 if (!(INTEGRAL_TYPE_P (t1) && INTEGRAL_TYPE_P (t2)))
4388 /* Only fold conversions that preserve both precisions. */
4389 if (TYPE_PRECISION (t1) == TYPE_PRECISION (t2)
4390 && operand_equal_p (rm_size (t1), rm_size (t2), 0))
4396 /* Return an expression that does an unchecked conversion of EXPR to TYPE.
4397 If NOTRUNC_P is true, truncation operations should be suppressed.
4399 Special care is required with (source or target) integral types whose
4400 precision is not equal to their size, to make sure we fetch or assign
4401 the value bits whose location might depend on the endianness, e.g.
4403 Rmsize : constant := 8;
4404 subtype Int is Integer range 0 .. 2 ** Rmsize - 1;
4406 type Bit_Array is array (1 .. Rmsize) of Boolean;
4407 pragma Pack (Bit_Array);
4409 function To_Bit_Array is new Unchecked_Conversion (Int, Bit_Array);
4411 Value : Int := 2#1000_0001#;
4412 Vbits : Bit_Array := To_Bit_Array (Value);
4414 we expect the 8 bits at Vbits'Address to always contain Value, while
4415 their original location depends on the endianness, at Value'Address
4416 on a little-endian architecture but not on a big-endian one. */
4419 unchecked_convert (tree type, tree expr, bool notrunc_p)
4421 tree etype = TREE_TYPE (expr);
4423 /* If the expression is already the right type, we are done. */
4427 /* If both types types are integral just do a normal conversion.
4428 Likewise for a conversion to an unconstrained array. */
4429 if ((((INTEGRAL_TYPE_P (type)
4430 && !(TREE_CODE (type) == INTEGER_TYPE
4431 && TYPE_VAX_FLOATING_POINT_P (type)))
4432 || (POINTER_TYPE_P (type) && ! TYPE_THIN_POINTER_P (type))
4433 || (TREE_CODE (type) == RECORD_TYPE
4434 && TYPE_JUSTIFIED_MODULAR_P (type)))
4435 && ((INTEGRAL_TYPE_P (etype)
4436 && !(TREE_CODE (etype) == INTEGER_TYPE
4437 && TYPE_VAX_FLOATING_POINT_P (etype)))
4438 || (POINTER_TYPE_P (etype) && !TYPE_THIN_POINTER_P (etype))
4439 || (TREE_CODE (etype) == RECORD_TYPE
4440 && TYPE_JUSTIFIED_MODULAR_P (etype))))
4441 || TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
4443 if (TREE_CODE (etype) == INTEGER_TYPE
4444 && TYPE_BIASED_REPRESENTATION_P (etype))
4446 tree ntype = copy_type (etype);
4447 TYPE_BIASED_REPRESENTATION_P (ntype) = 0;
4448 TYPE_MAIN_VARIANT (ntype) = ntype;
4449 expr = build1 (NOP_EXPR, ntype, expr);
4452 if (TREE_CODE (type) == INTEGER_TYPE
4453 && TYPE_BIASED_REPRESENTATION_P (type))
4455 tree rtype = copy_type (type);
4456 TYPE_BIASED_REPRESENTATION_P (rtype) = 0;
4457 TYPE_MAIN_VARIANT (rtype) = rtype;
4458 expr = convert (rtype, expr);
4459 expr = build1 (NOP_EXPR, type, expr);
4462 expr = convert (type, expr);
4465 /* If we are converting to an integral type whose precision is not equal
4466 to its size, first unchecked convert to a record that contains an
4467 object of the output type. Then extract the field. */
4468 else if (INTEGRAL_TYPE_P (type) && TYPE_RM_SIZE (type)
4469 && 0 != compare_tree_int (TYPE_RM_SIZE (type),
4470 GET_MODE_BITSIZE (TYPE_MODE (type))))
4472 tree rec_type = make_node (RECORD_TYPE);
4473 tree field = create_field_decl (get_identifier ("OBJ"), type,
4474 rec_type, 1, 0, 0, 0);
4476 TYPE_FIELDS (rec_type) = field;
4477 layout_type (rec_type);
4479 expr = unchecked_convert (rec_type, expr, notrunc_p);
4480 expr = build_component_ref (expr, NULL_TREE, field, 0);
4483 /* Similarly if we are converting from an integral type whose precision
4484 is not equal to its size. */
4485 else if (INTEGRAL_TYPE_P (etype) && TYPE_RM_SIZE (etype)
4486 && 0 != compare_tree_int (TYPE_RM_SIZE (etype),
4487 GET_MODE_BITSIZE (TYPE_MODE (etype))))
4489 tree rec_type = make_node (RECORD_TYPE);
4491 = create_field_decl (get_identifier ("OBJ"), etype, rec_type,
4494 TYPE_FIELDS (rec_type) = field;
4495 layout_type (rec_type);
4497 expr = gnat_build_constructor (rec_type, build_tree_list (field, expr));
4498 expr = unchecked_convert (type, expr, notrunc_p);
4501 /* We have a special case when we are converting between two
4502 unconstrained array types. In that case, take the address,
4503 convert the fat pointer types, and dereference. */
4504 else if (TREE_CODE (etype) == UNCONSTRAINED_ARRAY_TYPE
4505 && TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)
4506 expr = build_unary_op (INDIRECT_REF, NULL_TREE,
4507 build1 (VIEW_CONVERT_EXPR, TREE_TYPE (type),
4508 build_unary_op (ADDR_EXPR, NULL_TREE,
4512 expr = maybe_unconstrained_array (expr);
4513 etype = TREE_TYPE (expr);
4514 if (can_fold_for_view_convert_p (expr))
4515 expr = fold_build1 (VIEW_CONVERT_EXPR, type, expr);
4517 expr = build1 (VIEW_CONVERT_EXPR, type, expr);
4520 /* If the result is an integral type whose precision is not equal to its
4521 size, sign- or zero-extend the result. We need not do this if the input
4522 is an integral type of the same precision and signedness or if the output
4523 is a biased type or if both the input and output are unsigned. */
4525 && INTEGRAL_TYPE_P (type) && TYPE_RM_SIZE (type)
4526 && !(TREE_CODE (type) == INTEGER_TYPE
4527 && TYPE_BIASED_REPRESENTATION_P (type))
4528 && 0 != compare_tree_int (TYPE_RM_SIZE (type),
4529 GET_MODE_BITSIZE (TYPE_MODE (type)))
4530 && !(INTEGRAL_TYPE_P (etype)
4531 && TYPE_UNSIGNED (type) == TYPE_UNSIGNED (etype)
4532 && operand_equal_p (TYPE_RM_SIZE (type),
4533 (TYPE_RM_SIZE (etype) != 0
4534 ? TYPE_RM_SIZE (etype) : TYPE_SIZE (etype)),
4536 && !(TYPE_UNSIGNED (type) && TYPE_UNSIGNED (etype)))
4538 tree base_type = gnat_type_for_mode (TYPE_MODE (type),
4539 TYPE_UNSIGNED (type));
4541 = convert (base_type,
4542 size_binop (MINUS_EXPR,
4544 (GET_MODE_BITSIZE (TYPE_MODE (type))),
4545 TYPE_RM_SIZE (type)));
4548 build_binary_op (RSHIFT_EXPR, base_type,
4549 build_binary_op (LSHIFT_EXPR, base_type,
4550 convert (base_type, expr),
4555 /* An unchecked conversion should never raise Constraint_Error. The code
4556 below assumes that GCC's conversion routines overflow the same way that
4557 the underlying hardware does. This is probably true. In the rare case
4558 when it is false, we can rely on the fact that such conversions are
4559 erroneous anyway. */
4560 if (TREE_CODE (expr) == INTEGER_CST)
4561 TREE_OVERFLOW (expr) = 0;
4563 /* If the sizes of the types differ and this is an VIEW_CONVERT_EXPR,
4564 show no longer constant. */
4565 if (TREE_CODE (expr) == VIEW_CONVERT_EXPR
4566 && !operand_equal_p (TYPE_SIZE_UNIT (type), TYPE_SIZE_UNIT (etype),
4568 TREE_CONSTANT (expr) = 0;
4573 /* Return the appropriate GCC tree code for the specified GNAT_TYPE,
4574 the latter being a record type as predicated by Is_Record_Type. */
4577 tree_code_for_record_type (Entity_Id gnat_type)
4579 Node_Id component_list
4580 = Component_List (Type_Definition
4582 (Implementation_Base_Type (gnat_type))));
4585 /* Make this a UNION_TYPE unless it's either not an Unchecked_Union or
4586 we have a non-discriminant field outside a variant. In either case,
4587 it's a RECORD_TYPE. */
4589 if (!Is_Unchecked_Union (gnat_type))
4592 for (component = First_Non_Pragma (Component_Items (component_list));
4593 Present (component);
4594 component = Next_Non_Pragma (component))
4595 if (Ekind (Defining_Entity (component)) == E_Component)
4601 /* Return true if GNAT_TYPE is a "double" floating-point type, i.e. whose
4602 size is equal to 64 bits, or an array of such a type. Set ALIGN_CLAUSE
4603 according to the presence of an alignment clause on the type or, if it
4604 is an array, on the component type. */
4607 is_double_float_or_array (Entity_Id gnat_type, bool *align_clause)
4609 gnat_type = Underlying_Type (gnat_type);
4611 *align_clause = Present (Alignment_Clause (gnat_type));
4613 if (Is_Array_Type (gnat_type))
4615 gnat_type = Underlying_Type (Component_Type (gnat_type));
4616 if (Present (Alignment_Clause (gnat_type)))
4617 *align_clause = true;
4620 if (!Is_Floating_Point_Type (gnat_type))
4623 if (UI_To_Int (Esize (gnat_type)) != 64)
4629 /* Return true if GNAT_TYPE is a "double" or larger scalar type, i.e. whose
4630 size is greater or equal to 64 bits, or an array of such a type. Set
4631 ALIGN_CLAUSE according to the presence of an alignment clause on the
4632 type or, if it is an array, on the component type. */
4635 is_double_scalar_or_array (Entity_Id gnat_type, bool *align_clause)
4637 gnat_type = Underlying_Type (gnat_type);
4639 *align_clause = Present (Alignment_Clause (gnat_type));
4641 if (Is_Array_Type (gnat_type))
4643 gnat_type = Underlying_Type (Component_Type (gnat_type));
4644 if (Present (Alignment_Clause (gnat_type)))
4645 *align_clause = true;
4648 if (!Is_Scalar_Type (gnat_type))
4651 if (UI_To_Int (Esize (gnat_type)) < 64)
4657 /* Return true if GNU_TYPE is suitable as the type of a non-aliased
4658 component of an aggregate type. */
4661 type_for_nonaliased_component_p (tree gnu_type)
4663 /* If the type is passed by reference, we may have pointers to the
4664 component so it cannot be made non-aliased. */
4665 if (must_pass_by_ref (gnu_type) || default_pass_by_ref (gnu_type))
4668 /* We used to say that any component of aggregate type is aliased
4669 because the front-end may take 'Reference of it. The front-end
4670 has been enhanced in the meantime so as to use a renaming instead
4671 in most cases, but the back-end can probably take the address of
4672 such a component too so we go for the conservative stance.
4674 For instance, we might need the address of any array type, even
4675 if normally passed by copy, to construct a fat pointer if the
4676 component is used as an actual for an unconstrained formal.
4678 Likewise for record types: even if a specific record subtype is
4679 passed by copy, the parent type might be passed by ref (e.g. if
4680 it's of variable size) and we might take the address of a child
4681 component to pass to a parent formal. We have no way to check
4682 for such conditions here. */
4683 if (AGGREGATE_TYPE_P (gnu_type))
4689 /* Perform final processing on global variables. */
4692 gnat_write_global_declarations (void)
4694 /* Proceed to optimize and emit assembly.
4695 FIXME: shouldn't be the front end's responsibility to call this. */
4698 /* Emit debug info for all global declarations. */
4699 emit_debug_global_declarations (VEC_address (tree, global_decls),
4700 VEC_length (tree, global_decls));
4703 /* ************************************************************************
4704 * * GCC builtins support *
4705 * ************************************************************************ */
4707 /* The general scheme is fairly simple:
4709 For each builtin function/type to be declared, gnat_install_builtins calls
4710 internal facilities which eventually get to gnat_push_decl, which in turn
4711 tracks the so declared builtin function decls in the 'builtin_decls' global
4712 datastructure. When an Intrinsic subprogram declaration is processed, we
4713 search this global datastructure to retrieve the associated BUILT_IN DECL
4716 /* Search the chain of currently available builtin declarations for a node
4717 corresponding to function NAME (an IDENTIFIER_NODE). Return the first node
4718 found, if any, or NULL_TREE otherwise. */
4720 builtin_decl_for (tree name)
4725 for (i = 0; VEC_iterate(tree, builtin_decls, i, decl); i++)
4726 if (DECL_NAME (decl) == name)
4732 /* The code below eventually exposes gnat_install_builtins, which declares
4733 the builtin types and functions we might need, either internally or as
4734 user accessible facilities.
4736 ??? This is a first implementation shot, still in rough shape. It is
4737 heavily inspired from the "C" family implementation, with chunks copied
4738 verbatim from there.
4740 Two obvious TODO candidates are
4741 o Use a more efficient name/decl mapping scheme
4742 o Devise a middle-end infrastructure to avoid having to copy
4743 pieces between front-ends. */
4745 /* ----------------------------------------------------------------------- *
4746 * BUILTIN ELEMENTARY TYPES *
4747 * ----------------------------------------------------------------------- */
4749 /* Standard data types to be used in builtin argument declarations. */
4753 CTI_SIGNED_SIZE_TYPE, /* For format checking only. */
4755 CTI_CONST_STRING_TYPE,
4760 static tree c_global_trees[CTI_MAX];
4762 #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE]
4763 #define string_type_node c_global_trees[CTI_STRING_TYPE]
4764 #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE]
4766 /* ??? In addition some attribute handlers, we currently don't support a
4767 (small) number of builtin-types, which in turns inhibits support for a
4768 number of builtin functions. */
4769 #define wint_type_node void_type_node
4770 #define intmax_type_node void_type_node
4771 #define uintmax_type_node void_type_node
4773 /* Build the void_list_node (void_type_node having been created). */
4776 build_void_list_node (void)
4778 tree t = build_tree_list (NULL_TREE, void_type_node);
4782 /* Used to help initialize the builtin-types.def table. When a type of
4783 the correct size doesn't exist, use error_mark_node instead of NULL.
4784 The later results in segfaults even when a decl using the type doesn't
4788 builtin_type_for_size (int size, bool unsignedp)
4790 tree type = lang_hooks.types.type_for_size (size, unsignedp);
4791 return type ? type : error_mark_node;
4794 /* Build/push the elementary type decls that builtin functions/types
4798 install_builtin_elementary_types (void)
4800 signed_size_type_node = size_type_node;
4801 pid_type_node = integer_type_node;
4802 void_list_node = build_void_list_node ();
4804 string_type_node = build_pointer_type (char_type_node);
4805 const_string_type_node
4806 = build_pointer_type (build_qualified_type
4807 (char_type_node, TYPE_QUAL_CONST));
4810 /* ----------------------------------------------------------------------- *
4811 * BUILTIN FUNCTION TYPES *
4812 * ----------------------------------------------------------------------- */
4814 /* Now, builtin function types per se. */
4818 #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME,
4819 #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME,
4820 #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME,
4821 #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME,
4822 #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
4823 #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
4824 #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME,
4825 #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME,
4826 #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME,
4827 #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME,
4828 #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME,
4829 #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME,
4830 #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME,
4831 #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME,
4832 #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \
4834 #define DEF_POINTER_TYPE(NAME, TYPE) NAME,
4835 #include "builtin-types.def"
4836 #undef DEF_PRIMITIVE_TYPE
4837 #undef DEF_FUNCTION_TYPE_0
4838 #undef DEF_FUNCTION_TYPE_1
4839 #undef DEF_FUNCTION_TYPE_2
4840 #undef DEF_FUNCTION_TYPE_3
4841 #undef DEF_FUNCTION_TYPE_4
4842 #undef DEF_FUNCTION_TYPE_5
4843 #undef DEF_FUNCTION_TYPE_6
4844 #undef DEF_FUNCTION_TYPE_7
4845 #undef DEF_FUNCTION_TYPE_VAR_0
4846 #undef DEF_FUNCTION_TYPE_VAR_1
4847 #undef DEF_FUNCTION_TYPE_VAR_2
4848 #undef DEF_FUNCTION_TYPE_VAR_3
4849 #undef DEF_FUNCTION_TYPE_VAR_4
4850 #undef DEF_FUNCTION_TYPE_VAR_5
4851 #undef DEF_POINTER_TYPE
4855 typedef enum c_builtin_type builtin_type;
4857 /* A temporary array used in communication with def_fn_type. */
4858 static GTY(()) tree builtin_types[(int) BT_LAST + 1];
4860 /* A helper function for install_builtin_types. Build function type
4861 for DEF with return type RET and N arguments. If VAR is true, then the
4862 function should be variadic after those N arguments.
4864 Takes special care not to ICE if any of the types involved are
4865 error_mark_node, which indicates that said type is not in fact available
4866 (see builtin_type_for_size). In which case the function type as a whole
4867 should be error_mark_node. */
4870 def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...)
4872 tree args = NULL, t;
4877 for (i = 0; i < n; ++i)
4879 builtin_type a = (builtin_type) va_arg (list, int);
4880 t = builtin_types[a];
4881 if (t == error_mark_node)
4883 args = tree_cons (NULL_TREE, t, args);
4887 args = nreverse (args);
4889 args = chainon (args, void_list_node);
4891 t = builtin_types[ret];
4892 if (t == error_mark_node)
4894 t = build_function_type (t, args);
4897 builtin_types[def] = t;
4900 /* Build the builtin function types and install them in the builtin_types
4901 array for later use in builtin function decls. */
4904 install_builtin_function_types (void)
4906 tree va_list_ref_type_node;
4907 tree va_list_arg_type_node;
4909 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
4911 va_list_arg_type_node = va_list_ref_type_node =
4912 build_pointer_type (TREE_TYPE (va_list_type_node));
4916 va_list_arg_type_node = va_list_type_node;
4917 va_list_ref_type_node = build_reference_type (va_list_type_node);
4920 #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \
4921 builtin_types[ENUM] = VALUE;
4922 #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \
4923 def_fn_type (ENUM, RETURN, 0, 0);
4924 #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \
4925 def_fn_type (ENUM, RETURN, 0, 1, ARG1);
4926 #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \
4927 def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2);
4928 #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
4929 def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3);
4930 #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
4931 def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4);
4932 #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \
4933 def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5);
4934 #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \
4936 def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6);
4937 #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \
4939 def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7);
4940 #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \
4941 def_fn_type (ENUM, RETURN, 1, 0);
4942 #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \
4943 def_fn_type (ENUM, RETURN, 1, 1, ARG1);
4944 #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \
4945 def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2);
4946 #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \
4947 def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3);
4948 #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \
4949 def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4);
4950 #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \
4951 def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5);
4952 #define DEF_POINTER_TYPE(ENUM, TYPE) \
4953 builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]);
4955 #include "builtin-types.def"
4957 #undef DEF_PRIMITIVE_TYPE
4958 #undef DEF_FUNCTION_TYPE_1
4959 #undef DEF_FUNCTION_TYPE_2
4960 #undef DEF_FUNCTION_TYPE_3
4961 #undef DEF_FUNCTION_TYPE_4
4962 #undef DEF_FUNCTION_TYPE_5
4963 #undef DEF_FUNCTION_TYPE_6
4964 #undef DEF_FUNCTION_TYPE_VAR_0
4965 #undef DEF_FUNCTION_TYPE_VAR_1
4966 #undef DEF_FUNCTION_TYPE_VAR_2
4967 #undef DEF_FUNCTION_TYPE_VAR_3
4968 #undef DEF_FUNCTION_TYPE_VAR_4
4969 #undef DEF_FUNCTION_TYPE_VAR_5
4970 #undef DEF_POINTER_TYPE
4971 builtin_types[(int) BT_LAST] = NULL_TREE;
4974 /* ----------------------------------------------------------------------- *
4975 * BUILTIN ATTRIBUTES *
4976 * ----------------------------------------------------------------------- */
4978 enum built_in_attribute
4980 #define DEF_ATTR_NULL_TREE(ENUM) ENUM,
4981 #define DEF_ATTR_INT(ENUM, VALUE) ENUM,
4982 #define DEF_ATTR_IDENT(ENUM, STRING) ENUM,
4983 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM,
4984 #include "builtin-attrs.def"
4985 #undef DEF_ATTR_NULL_TREE
4987 #undef DEF_ATTR_IDENT
4988 #undef DEF_ATTR_TREE_LIST
4992 static GTY(()) tree built_in_attributes[(int) ATTR_LAST];
4995 install_builtin_attributes (void)
4997 /* Fill in the built_in_attributes array. */
4998 #define DEF_ATTR_NULL_TREE(ENUM) \
4999 built_in_attributes[(int) ENUM] = NULL_TREE;
5000 #define DEF_ATTR_INT(ENUM, VALUE) \
5001 built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE);
5002 #define DEF_ATTR_IDENT(ENUM, STRING) \
5003 built_in_attributes[(int) ENUM] = get_identifier (STRING);
5004 #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \
5005 built_in_attributes[(int) ENUM] \
5006 = tree_cons (built_in_attributes[(int) PURPOSE], \
5007 built_in_attributes[(int) VALUE], \
5008 built_in_attributes[(int) CHAIN]);
5009 #include "builtin-attrs.def"
5010 #undef DEF_ATTR_NULL_TREE
5012 #undef DEF_ATTR_IDENT
5013 #undef DEF_ATTR_TREE_LIST
5016 /* Handle a "const" attribute; arguments as in
5017 struct attribute_spec.handler. */
5020 handle_const_attribute (tree *node, tree ARG_UNUSED (name),
5021 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
5024 if (TREE_CODE (*node) == FUNCTION_DECL)
5025 TREE_READONLY (*node) = 1;
5027 *no_add_attrs = true;
5032 /* Handle a "nothrow" attribute; arguments as in
5033 struct attribute_spec.handler. */
5036 handle_nothrow_attribute (tree *node, tree ARG_UNUSED (name),
5037 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
5040 if (TREE_CODE (*node) == FUNCTION_DECL)
5041 TREE_NOTHROW (*node) = 1;
5043 *no_add_attrs = true;
5048 /* Handle a "pure" attribute; arguments as in
5049 struct attribute_spec.handler. */
5052 handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5053 int ARG_UNUSED (flags), bool *no_add_attrs)
5055 if (TREE_CODE (*node) == FUNCTION_DECL)
5056 DECL_PURE_P (*node) = 1;
5057 /* ??? TODO: Support types. */
5060 warning (OPT_Wattributes, "%qE attribute ignored", name);
5061 *no_add_attrs = true;
5067 /* Handle a "no vops" attribute; arguments as in
5068 struct attribute_spec.handler. */
5071 handle_novops_attribute (tree *node, tree ARG_UNUSED (name),
5072 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
5073 bool *ARG_UNUSED (no_add_attrs))
5075 gcc_assert (TREE_CODE (*node) == FUNCTION_DECL);
5076 DECL_IS_NOVOPS (*node) = 1;
5080 /* Helper for nonnull attribute handling; fetch the operand number
5081 from the attribute argument list. */
5084 get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp)
5086 /* Verify the arg number is a constant. */
5087 if (TREE_CODE (arg_num_expr) != INTEGER_CST
5088 || TREE_INT_CST_HIGH (arg_num_expr) != 0)
5091 *valp = TREE_INT_CST_LOW (arg_num_expr);
5095 /* Handle the "nonnull" attribute. */
5097 handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name),
5098 tree args, int ARG_UNUSED (flags),
5102 unsigned HOST_WIDE_INT attr_arg_num;
5104 /* If no arguments are specified, all pointer arguments should be
5105 non-null. Verify a full prototype is given so that the arguments
5106 will have the correct types when we actually check them later. */
5109 if (!TYPE_ARG_TYPES (type))
5111 error ("nonnull attribute without arguments on a non-prototype");
5112 *no_add_attrs = true;
5117 /* Argument list specified. Verify that each argument number references
5118 a pointer argument. */
5119 for (attr_arg_num = 1; args; args = TREE_CHAIN (args))
5122 unsigned HOST_WIDE_INT arg_num = 0, ck_num;
5124 if (!get_nonnull_operand (TREE_VALUE (args), &arg_num))
5126 error ("nonnull argument has invalid operand number (argument %lu)",
5127 (unsigned long) attr_arg_num);
5128 *no_add_attrs = true;
5132 argument = TYPE_ARG_TYPES (type);
5135 for (ck_num = 1; ; ck_num++)
5137 if (!argument || ck_num == arg_num)
5139 argument = TREE_CHAIN (argument);
5143 || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE)
5145 error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)",
5146 (unsigned long) attr_arg_num, (unsigned long) arg_num);
5147 *no_add_attrs = true;
5151 if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE)
5153 error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)",
5154 (unsigned long) attr_arg_num, (unsigned long) arg_num);
5155 *no_add_attrs = true;
5164 /* Handle a "sentinel" attribute. */
5167 handle_sentinel_attribute (tree *node, tree name, tree args,
5168 int ARG_UNUSED (flags), bool *no_add_attrs)
5170 tree params = TYPE_ARG_TYPES (*node);
5174 warning (OPT_Wattributes,
5175 "%qE attribute requires prototypes with named arguments", name);
5176 *no_add_attrs = true;
5180 while (TREE_CHAIN (params))
5181 params = TREE_CHAIN (params);
5183 if (VOID_TYPE_P (TREE_VALUE (params)))
5185 warning (OPT_Wattributes,
5186 "%qE attribute only applies to variadic functions", name);
5187 *no_add_attrs = true;
5193 tree position = TREE_VALUE (args);
5195 if (TREE_CODE (position) != INTEGER_CST)
5197 warning (0, "requested position is not an integer constant");
5198 *no_add_attrs = true;
5202 if (tree_int_cst_lt (position, integer_zero_node))
5204 warning (0, "requested position is less than zero");
5205 *no_add_attrs = true;
5213 /* Handle a "noreturn" attribute; arguments as in
5214 struct attribute_spec.handler. */
5217 handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5218 int ARG_UNUSED (flags), bool *no_add_attrs)
5220 tree type = TREE_TYPE (*node);
5222 /* See FIXME comment in c_common_attribute_table. */
5223 if (TREE_CODE (*node) == FUNCTION_DECL)
5224 TREE_THIS_VOLATILE (*node) = 1;
5225 else if (TREE_CODE (type) == POINTER_TYPE
5226 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
5228 = build_pointer_type
5229 (build_type_variant (TREE_TYPE (type),
5230 TYPE_READONLY (TREE_TYPE (type)), 1));
5233 warning (OPT_Wattributes, "%qE attribute ignored", name);
5234 *no_add_attrs = true;
5240 /* Handle a "malloc" attribute; arguments as in
5241 struct attribute_spec.handler. */
5244 handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args),
5245 int ARG_UNUSED (flags), bool *no_add_attrs)
5247 if (TREE_CODE (*node) == FUNCTION_DECL
5248 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node))))
5249 DECL_IS_MALLOC (*node) = 1;
5252 warning (OPT_Wattributes, "%qE attribute ignored", name);
5253 *no_add_attrs = true;
5259 /* Fake handler for attributes we don't properly support. */
5262 fake_attribute_handler (tree * ARG_UNUSED (node),
5263 tree ARG_UNUSED (name),
5264 tree ARG_UNUSED (args),
5265 int ARG_UNUSED (flags),
5266 bool * ARG_UNUSED (no_add_attrs))
5271 /* Handle a "type_generic" attribute. */
5274 handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name),
5275 tree ARG_UNUSED (args), int ARG_UNUSED (flags),
5276 bool * ARG_UNUSED (no_add_attrs))
5280 /* Ensure we have a function type. */
5281 gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE);
5283 params = TYPE_ARG_TYPES (*node);
5284 while (params && ! VOID_TYPE_P (TREE_VALUE (params)))
5285 params = TREE_CHAIN (params);
5287 /* Ensure we have a variadic function. */
5288 gcc_assert (!params);
5293 /* Handle a "vector_size" attribute; arguments as in
5294 struct attribute_spec.handler. */
5297 handle_vector_size_attribute (tree *node, tree name, tree args,
5298 int ARG_UNUSED (flags),
5301 unsigned HOST_WIDE_INT vecsize, nunits;
5302 enum machine_mode orig_mode;
5303 tree type = *node, new_type, size;
5305 *no_add_attrs = true;
5307 size = TREE_VALUE (args);
5309 if (!host_integerp (size, 1))
5311 warning (OPT_Wattributes, "%qE attribute ignored", name);
5315 /* Get the vector size (in bytes). */
5316 vecsize = tree_low_cst (size, 1);
5318 /* We need to provide for vector pointers, vector arrays, and
5319 functions returning vectors. For example:
5321 __attribute__((vector_size(16))) short *foo;
5323 In this case, the mode is SI, but the type being modified is
5324 HI, so we need to look further. */
5326 while (POINTER_TYPE_P (type)
5327 || TREE_CODE (type) == FUNCTION_TYPE
5328 || TREE_CODE (type) == METHOD_TYPE
5329 || TREE_CODE (type) == ARRAY_TYPE
5330 || TREE_CODE (type) == OFFSET_TYPE)
5331 type = TREE_TYPE (type);
5333 /* Get the mode of the type being modified. */
5334 orig_mode = TYPE_MODE (type);
5336 if ((!INTEGRAL_TYPE_P (type)
5337 && !SCALAR_FLOAT_TYPE_P (type)
5338 && !FIXED_POINT_TYPE_P (type))
5339 || (!SCALAR_FLOAT_MODE_P (orig_mode)
5340 && GET_MODE_CLASS (orig_mode) != MODE_INT
5341 && !ALL_SCALAR_FIXED_POINT_MODE_P (orig_mode))
5342 || !host_integerp (TYPE_SIZE_UNIT (type), 1)
5343 || TREE_CODE (type) == BOOLEAN_TYPE)
5345 error ("invalid vector type for attribute %qE", name);
5349 if (vecsize % tree_low_cst (TYPE_SIZE_UNIT (type), 1))
5351 error ("vector size not an integral multiple of component size");
5357 error ("zero vector size");
5361 /* Calculate how many units fit in the vector. */
5362 nunits = vecsize / tree_low_cst (TYPE_SIZE_UNIT (type), 1);
5363 if (nunits & (nunits - 1))
5365 error ("number of components of the vector not a power of two");
5369 new_type = build_vector_type (type, nunits);
5371 /* Build back pointers if needed. */
5372 *node = lang_hooks.types.reconstruct_complex_type (*node, new_type);
5377 /* ----------------------------------------------------------------------- *
5378 * BUILTIN FUNCTIONS *
5379 * ----------------------------------------------------------------------- */
5381 /* Worker for DEF_BUILTIN. Possibly define a builtin function with one or two
5382 names. Does not declare a non-__builtin_ function if flag_no_builtin, or
5383 if nonansi_p and flag_no_nonansi_builtin. */
5386 def_builtin_1 (enum built_in_function fncode,
5388 enum built_in_class fnclass,
5389 tree fntype, tree libtype,
5390 bool both_p, bool fallback_p,
5391 bool nonansi_p ATTRIBUTE_UNUSED,
5392 tree fnattrs, bool implicit_p)
5395 const char *libname;
5397 /* Preserve an already installed decl. It most likely was setup in advance
5398 (e.g. as part of the internal builtins) for specific reasons. */
5399 if (built_in_decls[(int) fncode] != NULL_TREE)
5402 gcc_assert ((!both_p && !fallback_p)
5403 || !strncmp (name, "__builtin_",
5404 strlen ("__builtin_")));
5406 libname = name + strlen ("__builtin_");
5407 decl = add_builtin_function (name, fntype, fncode, fnclass,
5408 (fallback_p ? libname : NULL),
5411 /* ??? This is normally further controlled by command-line options
5412 like -fno-builtin, but we don't have them for Ada. */
5413 add_builtin_function (libname, libtype, fncode, fnclass,
5416 built_in_decls[(int) fncode] = decl;
5418 implicit_built_in_decls[(int) fncode] = decl;
5421 static int flag_isoc94 = 0;
5422 static int flag_isoc99 = 0;
5424 /* Install what the common builtins.def offers. */
5427 install_builtin_functions (void)
5429 #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \
5430 NONANSI_P, ATTRS, IMPLICIT, COND) \
5432 def_builtin_1 (ENUM, NAME, CLASS, \
5433 builtin_types[(int) TYPE], \
5434 builtin_types[(int) LIBTYPE], \
5435 BOTH_P, FALLBACK_P, NONANSI_P, \
5436 built_in_attributes[(int) ATTRS], IMPLICIT);
5437 #include "builtins.def"
5441 /* ----------------------------------------------------------------------- *
5442 * BUILTIN FUNCTIONS *
5443 * ----------------------------------------------------------------------- */
5445 /* Install the builtin functions we might need. */
5448 gnat_install_builtins (void)
5450 install_builtin_elementary_types ();
5451 install_builtin_function_types ();
5452 install_builtin_attributes ();
5454 /* Install builtins used by generic middle-end pieces first. Some of these
5455 know about internal specificities and control attributes accordingly, for
5456 instance __builtin_alloca vs no-throw and -fstack-check. We will ignore
5457 the generic definition from builtins.def. */
5458 build_common_builtin_nodes ();
5460 /* Now, install the target specific builtins, such as the AltiVec family on
5461 ppc, and the common set as exposed by builtins.def. */
5462 targetm.init_builtins ();
5463 install_builtin_functions ();
5466 #include "gt-ada-utils.h"
5467 #include "gtype-ada.h"
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