1 /* Language-dependent node constructors for parse phase of GNU compiler.
2 Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
4 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
25 #include "coretypes.h"
33 #include "insn-config.h"
34 #include "integrate.h"
35 #include "tree-inline.h"
39 #include "tree-flow.h"
41 static tree bot_manip (tree *, int *, void *);
42 static tree bot_replace (tree *, int *, void *);
43 static tree build_cplus_array_type_1 (tree, tree);
44 static int list_hash_eq (const void *, const void *);
45 static hashval_t list_hash_pieces (tree, tree, tree);
46 static hashval_t list_hash (const void *);
47 static cp_lvalue_kind lvalue_p_1 (const_tree, int);
48 static tree build_target_expr (tree, tree);
49 static tree count_trees_r (tree *, int *, void *);
50 static tree verify_stmt_tree_r (tree *, int *, void *);
51 static tree build_local_temp (tree);
53 static tree handle_java_interface_attribute (tree *, tree, tree, int, bool *);
54 static tree handle_com_interface_attribute (tree *, tree, tree, int, bool *);
55 static tree handle_init_priority_attribute (tree *, tree, tree, int, bool *);
57 /* If REF is an lvalue, returns the kind of lvalue that REF is.
58 Otherwise, returns clk_none. If TREAT_CLASS_RVALUES_AS_LVALUES is
59 nonzero, rvalues of class type are considered lvalues. */
62 lvalue_p_1 (const_tree ref,
63 int treat_class_rvalues_as_lvalues)
65 cp_lvalue_kind op1_lvalue_kind = clk_none;
66 cp_lvalue_kind op2_lvalue_kind = clk_none;
68 /* Expressions of reference type are sometimes wrapped in
69 INDIRECT_REFs. INDIRECT_REFs are just internal compiler
70 representation, not part of the language, so we have to look
72 if (TREE_CODE (ref) == INDIRECT_REF
73 && TREE_CODE (TREE_TYPE (TREE_OPERAND (ref, 0)))
75 return lvalue_p_1 (TREE_OPERAND (ref, 0),
76 treat_class_rvalues_as_lvalues);
78 if (TREE_CODE (TREE_TYPE (ref)) == REFERENCE_TYPE)
80 /* unnamed rvalue references are rvalues */
81 if (TYPE_REF_IS_RVALUE (TREE_TYPE (ref))
82 && TREE_CODE (ref) != PARM_DECL
83 && TREE_CODE (ref) != VAR_DECL
84 && TREE_CODE (ref) != COMPONENT_REF)
87 /* lvalue references and named rvalue references are lvalues. */
91 if (ref == current_class_ptr)
94 switch (TREE_CODE (ref))
98 /* preincrements and predecrements are valid lvals, provided
99 what they refer to are valid lvals. */
100 case PREINCREMENT_EXPR:
101 case PREDECREMENT_EXPR:
103 case WITH_CLEANUP_EXPR:
106 return lvalue_p_1 (TREE_OPERAND (ref, 0),
107 treat_class_rvalues_as_lvalues);
110 op1_lvalue_kind = lvalue_p_1 (TREE_OPERAND (ref, 0),
111 treat_class_rvalues_as_lvalues);
112 /* Look at the member designator. */
114 /* The "field" can be a FUNCTION_DECL or an OVERLOAD in some
116 || TREE_CODE (TREE_OPERAND (ref, 1)) != FIELD_DECL)
118 else if (DECL_C_BIT_FIELD (TREE_OPERAND (ref, 1)))
120 /* Clear the ordinary bit. If this object was a class
121 rvalue we want to preserve that information. */
122 op1_lvalue_kind &= ~clk_ordinary;
123 /* The lvalue is for a bitfield. */
124 op1_lvalue_kind |= clk_bitfield;
126 else if (DECL_PACKED (TREE_OPERAND (ref, 1)))
127 op1_lvalue_kind |= clk_packed;
129 return op1_lvalue_kind;
136 if (TREE_READONLY (ref) && ! TREE_STATIC (ref)
137 && DECL_LANG_SPECIFIC (ref)
138 && DECL_IN_AGGR_P (ref))
144 if (TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE)
148 /* A currently unresolved scope ref. */
153 /* Disallow <? and >? as lvalues if either argument side-effects. */
154 if (TREE_SIDE_EFFECTS (TREE_OPERAND (ref, 0))
155 || TREE_SIDE_EFFECTS (TREE_OPERAND (ref, 1)))
157 op1_lvalue_kind = lvalue_p_1 (TREE_OPERAND (ref, 0),
158 treat_class_rvalues_as_lvalues);
159 op2_lvalue_kind = lvalue_p_1 (TREE_OPERAND (ref, 1),
160 treat_class_rvalues_as_lvalues);
164 op1_lvalue_kind = lvalue_p_1 (TREE_OPERAND (ref, 1)
165 ? TREE_OPERAND (ref, 1)
166 : TREE_OPERAND (ref, 0),
167 treat_class_rvalues_as_lvalues);
168 op2_lvalue_kind = lvalue_p_1 (TREE_OPERAND (ref, 2),
169 treat_class_rvalues_as_lvalues);
176 return lvalue_p_1 (TREE_OPERAND (ref, 1),
177 treat_class_rvalues_as_lvalues);
180 return treat_class_rvalues_as_lvalues ? clk_class : clk_none;
183 return (treat_class_rvalues_as_lvalues
184 && CLASS_TYPE_P (TREE_TYPE (ref))
185 ? clk_class : clk_none);
188 /* Any class-valued call would be wrapped in a TARGET_EXPR. */
192 /* All functions (except non-static-member functions) are
194 return (DECL_NONSTATIC_MEMBER_FUNCTION_P (ref)
195 ? clk_none : clk_ordinary);
197 case NON_DEPENDENT_EXPR:
198 /* We must consider NON_DEPENDENT_EXPRs to be lvalues so that
199 things like "&E" where "E" is an expression with a
200 non-dependent type work. It is safe to be lenient because an
201 error will be issued when the template is instantiated if "E"
209 /* If one operand is not an lvalue at all, then this expression is
211 if (!op1_lvalue_kind || !op2_lvalue_kind)
214 /* Otherwise, it's an lvalue, and it has all the odd properties
215 contributed by either operand. */
216 op1_lvalue_kind = op1_lvalue_kind | op2_lvalue_kind;
217 /* It's not an ordinary lvalue if it involves either a bit-field or
219 if ((op1_lvalue_kind & ~clk_ordinary) != clk_none)
220 op1_lvalue_kind &= ~clk_ordinary;
221 return op1_lvalue_kind;
224 /* Returns the kind of lvalue that REF is, in the sense of
225 [basic.lval]. This function should really be named lvalue_p; it
226 computes the C++ definition of lvalue. */
229 real_lvalue_p (const_tree ref)
231 return lvalue_p_1 (ref,
232 /*treat_class_rvalues_as_lvalues=*/0);
235 /* This differs from real_lvalue_p in that class rvalues are
236 considered lvalues. */
239 lvalue_p (const_tree ref)
242 (lvalue_p_1 (ref, /*class rvalue ok*/ 1) != clk_none);
245 /* Test whether DECL is a builtin that may appear in a
246 constant-expression. */
249 builtin_valid_in_constant_expr_p (const_tree decl)
251 /* At present BUILT_IN_CONSTANT_P is the only builtin we're allowing
252 in constant-expressions. We may want to add other builtins later. */
253 return DECL_IS_BUILTIN_CONSTANT_P (decl);
256 /* Build a TARGET_EXPR, initializing the DECL with the VALUE. */
259 build_target_expr (tree decl, tree value)
263 #ifdef ENABLE_CHECKING
264 gcc_assert (VOID_TYPE_P (TREE_TYPE (value))
265 || TREE_TYPE (decl) == TREE_TYPE (value)
266 || useless_type_conversion_p (TREE_TYPE (decl),
270 t = build4 (TARGET_EXPR, TREE_TYPE (decl), decl, value,
271 cxx_maybe_build_cleanup (decl), NULL_TREE);
272 /* We always set TREE_SIDE_EFFECTS so that expand_expr does not
273 ignore the TARGET_EXPR. If there really turn out to be no
274 side-effects, then the optimizer should be able to get rid of
275 whatever code is generated anyhow. */
276 TREE_SIDE_EFFECTS (t) = 1;
281 /* Return an undeclared local temporary of type TYPE for use in building a
285 build_local_temp (tree type)
287 tree slot = build_decl (VAR_DECL, NULL_TREE, type);
288 DECL_ARTIFICIAL (slot) = 1;
289 DECL_IGNORED_P (slot) = 1;
290 DECL_CONTEXT (slot) = current_function_decl;
291 layout_decl (slot, 0);
295 /* Set various status flags when building an AGGR_INIT_EXPR object T. */
298 process_aggr_init_operands (tree t)
302 side_effects = TREE_SIDE_EFFECTS (t);
306 n = TREE_OPERAND_LENGTH (t);
307 for (i = 1; i < n; i++)
309 tree op = TREE_OPERAND (t, i);
310 if (op && TREE_SIDE_EFFECTS (op))
317 TREE_SIDE_EFFECTS (t) = side_effects;
320 /* Build an AGGR_INIT_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE,
321 FN, and SLOT. NARGS is the number of call arguments which are specified
322 as a tree array ARGS. */
325 build_aggr_init_array (tree return_type, tree fn, tree slot, int nargs,
331 t = build_vl_exp (AGGR_INIT_EXPR, nargs + 3);
332 TREE_TYPE (t) = return_type;
333 AGGR_INIT_EXPR_FN (t) = fn;
334 AGGR_INIT_EXPR_SLOT (t) = slot;
335 for (i = 0; i < nargs; i++)
336 AGGR_INIT_EXPR_ARG (t, i) = args[i];
337 process_aggr_init_operands (t);
341 /* INIT is a CALL_EXPR or AGGR_INIT_EXPR which needs info about its
342 target. TYPE is the type that this initialization should appear to
345 Build an encapsulation of the initialization to perform
346 and return it so that it can be processed by language-independent
347 and language-specific expression expanders. */
350 build_cplus_new (tree type, tree init)
357 /* Make sure that we're not trying to create an instance of an
359 abstract_virtuals_error (NULL_TREE, type);
361 if (TREE_CODE (init) == CALL_EXPR)
362 fn = CALL_EXPR_FN (init);
363 else if (TREE_CODE (init) == AGGR_INIT_EXPR)
364 fn = AGGR_INIT_EXPR_FN (init);
366 return convert (type, init);
368 is_ctor = (TREE_CODE (fn) == ADDR_EXPR
369 && TREE_CODE (TREE_OPERAND (fn, 0)) == FUNCTION_DECL
370 && DECL_CONSTRUCTOR_P (TREE_OPERAND (fn, 0)));
372 slot = build_local_temp (type);
374 /* We split the CALL_EXPR into its function and its arguments here.
375 Then, in expand_expr, we put them back together. The reason for
376 this is that this expression might be a default argument
377 expression. In that case, we need a new temporary every time the
378 expression is used. That's what break_out_target_exprs does; it
379 replaces every AGGR_INIT_EXPR with a copy that uses a fresh
380 temporary slot. Then, expand_expr builds up a call-expression
381 using the new slot. */
383 /* If we don't need to use a constructor to create an object of this
384 type, don't mess with AGGR_INIT_EXPR. */
385 if (is_ctor || TREE_ADDRESSABLE (type))
387 if (TREE_CODE(init) == CALL_EXPR)
388 rval = build_aggr_init_array (void_type_node, fn, slot,
389 call_expr_nargs (init),
390 CALL_EXPR_ARGP (init));
392 rval = build_aggr_init_array (void_type_node, fn, slot,
393 aggr_init_expr_nargs (init),
394 AGGR_INIT_EXPR_ARGP (init));
395 TREE_SIDE_EFFECTS (rval) = 1;
396 AGGR_INIT_VIA_CTOR_P (rval) = is_ctor;
401 rval = build_target_expr (slot, rval);
402 TARGET_EXPR_IMPLICIT_P (rval) = 1;
407 /* Build a TARGET_EXPR using INIT to initialize a new temporary of the
411 build_target_expr_with_type (tree init, tree type)
413 gcc_assert (!VOID_TYPE_P (type));
415 if (TREE_CODE (init) == TARGET_EXPR)
417 else if (CLASS_TYPE_P (type) && !TYPE_HAS_TRIVIAL_INIT_REF (type)
418 && !VOID_TYPE_P (TREE_TYPE (init))
419 && TREE_CODE (init) != COND_EXPR
420 && TREE_CODE (init) != CONSTRUCTOR
421 && TREE_CODE (init) != VA_ARG_EXPR)
422 /* We need to build up a copy constructor call. A void initializer
423 means we're being called from bot_manip. COND_EXPR is a special
424 case because we already have copies on the arms and we don't want
425 another one here. A CONSTRUCTOR is aggregate initialization, which
426 is handled separately. A VA_ARG_EXPR is magic creation of an
427 aggregate; there's no additional work to be done. */
428 return force_rvalue (init);
430 return force_target_expr (type, init);
433 /* Like the above function, but without the checking. This function should
434 only be used by code which is deliberately trying to subvert the type
435 system, such as call_builtin_trap. */
438 force_target_expr (tree type, tree init)
442 gcc_assert (!VOID_TYPE_P (type));
444 slot = build_local_temp (type);
445 return build_target_expr (slot, init);
448 /* Like build_target_expr_with_type, but use the type of INIT. */
451 get_target_expr (tree init)
453 return build_target_expr_with_type (init, TREE_TYPE (init));
456 /* If EXPR is a bitfield reference, convert it to the declared type of
457 the bitfield, and return the resulting expression. Otherwise,
458 return EXPR itself. */
461 convert_bitfield_to_declared_type (tree expr)
465 bitfield_type = is_bitfield_expr_with_lowered_type (expr);
467 expr = convert_to_integer (TYPE_MAIN_VARIANT (bitfield_type),
472 /* EXPR is being used in an rvalue context. Return a version of EXPR
473 that is marked as an rvalue. */
480 if (error_operand_p (expr))
485 Non-class rvalues always have cv-unqualified types. */
486 type = TREE_TYPE (expr);
487 if (!CLASS_TYPE_P (type) && cp_type_quals (type))
488 type = TYPE_MAIN_VARIANT (type);
490 if (!processing_template_decl && real_lvalue_p (expr))
491 expr = build1 (NON_LVALUE_EXPR, type, expr);
492 else if (type != TREE_TYPE (expr))
493 expr = build_nop (type, expr);
499 /* Hash an ARRAY_TYPE. K is really of type `tree'. */
502 cplus_array_hash (const void* k)
505 const_tree const t = (const_tree) k;
507 hash = (htab_hash_pointer (TREE_TYPE (t))
508 ^ htab_hash_pointer (TYPE_DOMAIN (t)));
513 typedef struct cplus_array_info {
518 /* Compare two ARRAY_TYPEs. K1 is really of type `tree', K2 is really
519 of type `cplus_array_info*'. */
522 cplus_array_compare (const void * k1, const void * k2)
524 const_tree const t1 = (const_tree) k1;
525 const cplus_array_info *const t2 = (const cplus_array_info*) k2;
527 return (TREE_TYPE (t1) == t2->type && TYPE_DOMAIN (t1) == t2->domain);
530 /* Hash table containing all of the C++ array types, including
531 dependent array types and array types whose element type is
533 static GTY ((param_is (union tree_node))) htab_t cplus_array_htab;
537 build_cplus_array_type_1 (tree elt_type, tree index_type)
541 if (elt_type == error_mark_node || index_type == error_mark_node)
542 return error_mark_node;
544 if (processing_template_decl
545 && (dependent_type_p (elt_type)
546 || (index_type && !TREE_CONSTANT (TYPE_MAX_VALUE (index_type)))))
549 cplus_array_info cai;
552 if (cplus_array_htab == NULL)
553 cplus_array_htab = htab_create_ggc (61, &cplus_array_hash,
554 &cplus_array_compare, NULL);
556 hash = (htab_hash_pointer (elt_type)
557 ^ htab_hash_pointer (index_type));
559 cai.domain = index_type;
561 e = htab_find_slot_with_hash (cplus_array_htab, &cai, hash, INSERT);
563 /* We have found the type: we're done. */
567 /* Build a new array type. */
568 t = make_node (ARRAY_TYPE);
569 TREE_TYPE (t) = elt_type;
570 TYPE_DOMAIN (t) = index_type;
572 /* Store it in the hash table. */
575 /* Set the canonical type for this new node. */
576 if (TYPE_STRUCTURAL_EQUALITY_P (elt_type)
577 || (index_type && TYPE_STRUCTURAL_EQUALITY_P (index_type)))
578 SET_TYPE_STRUCTURAL_EQUALITY (t);
579 else if (TYPE_CANONICAL (elt_type) != elt_type
581 && TYPE_CANONICAL (index_type) != index_type))
583 = build_cplus_array_type
584 (TYPE_CANONICAL (elt_type),
585 index_type ? TYPE_CANONICAL (index_type) : index_type);
587 TYPE_CANONICAL (t) = t;
591 t = build_array_type (elt_type, index_type);
593 /* Push these needs up so that initialization takes place
595 TYPE_NEEDS_CONSTRUCTING (t)
596 = TYPE_NEEDS_CONSTRUCTING (TYPE_MAIN_VARIANT (elt_type));
597 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
598 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TYPE_MAIN_VARIANT (elt_type));
603 build_cplus_array_type (tree elt_type, tree index_type)
606 int type_quals = cp_type_quals (elt_type);
608 if (type_quals != TYPE_UNQUALIFIED)
609 elt_type = cp_build_qualified_type (elt_type, TYPE_UNQUALIFIED);
611 t = build_cplus_array_type_1 (elt_type, index_type);
613 if (type_quals != TYPE_UNQUALIFIED)
614 t = cp_build_qualified_type (t, type_quals);
619 /* Return a reference type node referring to TO_TYPE. If RVAL is
620 true, return an rvalue reference type, otherwise return an lvalue
621 reference type. If a type node exists, reuse it, otherwise create
624 cp_build_reference_type (tree to_type, bool rval)
627 lvalue_ref = build_reference_type (to_type);
631 /* This code to create rvalue reference types is based on and tied
632 to the code creating lvalue reference types in the middle-end
633 functions build_reference_type_for_mode and build_reference_type.
635 It works by putting the rvalue reference type nodes after the
636 lvalue reference nodes in the TYPE_NEXT_REF_TO linked list, so
637 they will effectively be ignored by the middle end. */
639 for (t = lvalue_ref; (t = TYPE_NEXT_REF_TO (t)); )
640 if (TYPE_REF_IS_RVALUE (t))
643 t = copy_node (lvalue_ref);
645 TYPE_REF_IS_RVALUE (t) = true;
646 TYPE_NEXT_REF_TO (t) = TYPE_NEXT_REF_TO (lvalue_ref);
647 TYPE_NEXT_REF_TO (lvalue_ref) = t;
648 TYPE_MAIN_VARIANT (t) = t;
650 if (TYPE_STRUCTURAL_EQUALITY_P (to_type))
651 SET_TYPE_STRUCTURAL_EQUALITY (t);
652 else if (TYPE_CANONICAL (to_type) != to_type)
654 = cp_build_reference_type (TYPE_CANONICAL (to_type), rval);
656 TYPE_CANONICAL (t) = t;
664 /* Used by the C++ front end to build qualified array types. However,
665 the C version of this function does not properly maintain canonical
666 types (which are not used in C). */
668 c_build_qualified_type (tree type, int type_quals)
670 return cp_build_qualified_type (type, type_quals);
674 /* Make a variant of TYPE, qualified with the TYPE_QUALS. Handles
675 arrays correctly. In particular, if TYPE is an array of T's, and
676 TYPE_QUALS is non-empty, returns an array of qualified T's.
678 FLAGS determines how to deal with illformed qualifications. If
679 tf_ignore_bad_quals is set, then bad qualifications are dropped
680 (this is permitted if TYPE was introduced via a typedef or template
681 type parameter). If bad qualifications are dropped and tf_warning
682 is set, then a warning is issued for non-const qualifications. If
683 tf_ignore_bad_quals is not set and tf_error is not set, we
684 return error_mark_node. Otherwise, we issue an error, and ignore
687 Qualification of a reference type is valid when the reference came
688 via a typedef or template type argument. [dcl.ref] No such
689 dispensation is provided for qualifying a function type. [dcl.fct]
690 DR 295 queries this and the proposed resolution brings it into line
691 with qualifying a reference. We implement the DR. We also behave
692 in a similar manner for restricting non-pointer types. */
695 cp_build_qualified_type_real (tree type,
697 tsubst_flags_t complain)
700 int bad_quals = TYPE_UNQUALIFIED;
702 if (type == error_mark_node)
705 if (type_quals == cp_type_quals (type))
708 if (TREE_CODE (type) == ARRAY_TYPE)
710 /* In C++, the qualification really applies to the array element
711 type. Obtain the appropriately qualified element type. */
714 = cp_build_qualified_type_real (TREE_TYPE (type),
718 if (element_type == error_mark_node)
719 return error_mark_node;
721 /* See if we already have an identically qualified type. */
722 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
723 if (cp_type_quals (t) == type_quals
724 && TYPE_NAME (t) == TYPE_NAME (type)
725 && TYPE_CONTEXT (t) == TYPE_CONTEXT (type))
730 t = build_cplus_array_type_1 (element_type, TYPE_DOMAIN (type));
732 if (TYPE_MAIN_VARIANT (t) != TYPE_MAIN_VARIANT (type))
734 /* Set the main variant of the newly-created ARRAY_TYPE
735 (with cv-qualified element type) to the main variant of
736 the unqualified ARRAY_TYPE we started with. */
737 tree last_variant = t;
738 tree m = TYPE_MAIN_VARIANT (type);
740 /* Find the last variant on the new ARRAY_TYPEs list of
741 variants, setting the main variant of each of the other
742 types to the main variant of our unqualified
744 while (TYPE_NEXT_VARIANT (last_variant))
746 TYPE_MAIN_VARIANT (last_variant) = m;
747 last_variant = TYPE_NEXT_VARIANT (last_variant);
750 /* Splice in the newly-created variants. */
751 TYPE_NEXT_VARIANT (last_variant) = TYPE_NEXT_VARIANT (m);
752 TYPE_NEXT_VARIANT (m) = t;
753 TYPE_MAIN_VARIANT (last_variant) = m;
757 /* Even if we already had this variant, we update
758 TYPE_NEEDS_CONSTRUCTING and TYPE_HAS_NONTRIVIAL_DESTRUCTOR in case
759 they changed since the variant was originally created.
761 This seems hokey; if there is some way to use a previous
762 variant *without* coming through here,
763 TYPE_NEEDS_CONSTRUCTING will never be updated. */
764 TYPE_NEEDS_CONSTRUCTING (t)
765 = TYPE_NEEDS_CONSTRUCTING (TYPE_MAIN_VARIANT (element_type));
766 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
767 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TYPE_MAIN_VARIANT (element_type));
770 else if (TYPE_PTRMEMFUNC_P (type))
772 /* For a pointer-to-member type, we can't just return a
773 cv-qualified version of the RECORD_TYPE. If we do, we
774 haven't changed the field that contains the actual pointer to
775 a method, and so TYPE_PTRMEMFUNC_FN_TYPE will be wrong. */
778 t = TYPE_PTRMEMFUNC_FN_TYPE (type);
779 t = cp_build_qualified_type_real (t, type_quals, complain);
780 return build_ptrmemfunc_type (t);
782 else if (TREE_CODE (type) == TYPE_PACK_EXPANSION)
784 tree t = PACK_EXPANSION_PATTERN (type);
786 t = cp_build_qualified_type_real (t, type_quals, complain);
787 return make_pack_expansion (t);
790 /* A reference or method type shall not be cv qualified.
791 [dcl.ref], [dct.fct] */
792 if (type_quals & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE)
793 && (TREE_CODE (type) == REFERENCE_TYPE
794 || TREE_CODE (type) == METHOD_TYPE))
796 bad_quals |= type_quals & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE);
797 type_quals &= ~(TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE);
800 /* A restrict-qualified type must be a pointer (or reference)
801 to object or incomplete type, or a function type. */
802 if ((type_quals & TYPE_QUAL_RESTRICT)
803 && TREE_CODE (type) != TEMPLATE_TYPE_PARM
804 && TREE_CODE (type) != TYPENAME_TYPE
805 && TREE_CODE (type) != FUNCTION_TYPE
806 && !POINTER_TYPE_P (type))
808 bad_quals |= TYPE_QUAL_RESTRICT;
809 type_quals &= ~TYPE_QUAL_RESTRICT;
812 if (bad_quals == TYPE_UNQUALIFIED)
814 else if (!(complain & (tf_error | tf_ignore_bad_quals)))
815 return error_mark_node;
818 if (complain & tf_ignore_bad_quals)
819 /* We're not going to warn about constifying things that can't
821 bad_quals &= ~TYPE_QUAL_CONST;
824 tree bad_type = build_qualified_type (ptr_type_node, bad_quals);
826 if (!(complain & tf_ignore_bad_quals))
827 error ("%qV qualifiers cannot be applied to %qT",
832 /* Retrieve (or create) the appropriately qualified variant. */
833 result = build_qualified_type (type, type_quals);
835 /* If this was a pointer-to-method type, and we just made a copy,
836 then we need to unshare the record that holds the cached
837 pointer-to-member-function type, because these will be distinct
838 between the unqualified and qualified types. */
840 && TREE_CODE (type) == POINTER_TYPE
841 && TREE_CODE (TREE_TYPE (type)) == METHOD_TYPE)
842 TYPE_LANG_SPECIFIC (result) = NULL;
847 /* Returns the canonical version of TYPE. In other words, if TYPE is
848 a typedef, returns the underlying type. The cv-qualification of
849 the type returned matches the type input; they will always be
853 canonical_type_variant (tree t)
855 if (t == error_mark_node)
856 return error_mark_node;
858 return cp_build_qualified_type (TYPE_MAIN_VARIANT (t), cp_type_quals (t));
861 /* Makes a copy of BINFO and TYPE, which is to be inherited into a
862 graph dominated by T. If BINFO is NULL, TYPE is a dependent base,
863 and we do a shallow copy. If BINFO is non-NULL, we do a deep copy.
864 VIRT indicates whether TYPE is inherited virtually or not.
865 IGO_PREV points at the previous binfo of the inheritance graph
866 order chain. The newly copied binfo's TREE_CHAIN forms this
869 The CLASSTYPE_VBASECLASSES vector of T is constructed in the
870 correct order. That is in the order the bases themselves should be
873 The BINFO_INHERITANCE of a virtual base class points to the binfo
874 of the most derived type. ??? We could probably change this so that
875 BINFO_INHERITANCE becomes synonymous with BINFO_PRIMARY, and hence
876 remove a field. They currently can only differ for primary virtual
880 copy_binfo (tree binfo, tree type, tree t, tree *igo_prev, int virt)
886 /* See if we've already made this virtual base. */
887 new_binfo = binfo_for_vbase (type, t);
892 new_binfo = make_tree_binfo (binfo ? BINFO_N_BASE_BINFOS (binfo) : 0);
893 BINFO_TYPE (new_binfo) = type;
895 /* Chain it into the inheritance graph. */
896 TREE_CHAIN (*igo_prev) = new_binfo;
897 *igo_prev = new_binfo;
904 gcc_assert (!BINFO_DEPENDENT_BASE_P (binfo));
905 gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), type));
907 BINFO_OFFSET (new_binfo) = BINFO_OFFSET (binfo);
908 BINFO_VIRTUALS (new_binfo) = BINFO_VIRTUALS (binfo);
910 /* We do not need to copy the accesses, as they are read only. */
911 BINFO_BASE_ACCESSES (new_binfo) = BINFO_BASE_ACCESSES (binfo);
913 /* Recursively copy base binfos of BINFO. */
914 for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++)
918 gcc_assert (!BINFO_DEPENDENT_BASE_P (base_binfo));
919 new_base_binfo = copy_binfo (base_binfo, BINFO_TYPE (base_binfo),
921 BINFO_VIRTUAL_P (base_binfo));
923 if (!BINFO_INHERITANCE_CHAIN (new_base_binfo))
924 BINFO_INHERITANCE_CHAIN (new_base_binfo) = new_binfo;
925 BINFO_BASE_APPEND (new_binfo, new_base_binfo);
929 BINFO_DEPENDENT_BASE_P (new_binfo) = 1;
933 /* Push it onto the list after any virtual bases it contains
934 will have been pushed. */
935 VEC_quick_push (tree, CLASSTYPE_VBASECLASSES (t), new_binfo);
936 BINFO_VIRTUAL_P (new_binfo) = 1;
937 BINFO_INHERITANCE_CHAIN (new_binfo) = TYPE_BINFO (t);
943 /* Hashing of lists so that we don't make duplicates.
944 The entry point is `list_hash_canon'. */
946 /* Now here is the hash table. When recording a list, it is added
947 to the slot whose index is the hash code mod the table size.
948 Note that the hash table is used for several kinds of lists.
949 While all these live in the same table, they are completely independent,
950 and the hash code is computed differently for each of these. */
952 static GTY ((param_is (union tree_node))) htab_t list_hash_table;
961 /* Compare ENTRY (an entry in the hash table) with DATA (a list_proxy
962 for a node we are thinking about adding). */
965 list_hash_eq (const void* entry, const void* data)
967 const_tree const t = (const_tree) entry;
968 const struct list_proxy *const proxy = (const struct list_proxy *) data;
970 return (TREE_VALUE (t) == proxy->value
971 && TREE_PURPOSE (t) == proxy->purpose
972 && TREE_CHAIN (t) == proxy->chain);
975 /* Compute a hash code for a list (chain of TREE_LIST nodes
976 with goodies in the TREE_PURPOSE, TREE_VALUE, and bits of the
977 TREE_COMMON slots), by adding the hash codes of the individual entries. */
980 list_hash_pieces (tree purpose, tree value, tree chain)
982 hashval_t hashcode = 0;
985 hashcode += TREE_HASH (chain);
988 hashcode += TREE_HASH (value);
992 hashcode += TREE_HASH (purpose);
998 /* Hash an already existing TREE_LIST. */
1001 list_hash (const void* p)
1003 const_tree const t = (const_tree) p;
1004 return list_hash_pieces (TREE_PURPOSE (t),
1009 /* Given list components PURPOSE, VALUE, AND CHAIN, return the canonical
1010 object for an identical list if one already exists. Otherwise, build a
1011 new one, and record it as the canonical object. */
1014 hash_tree_cons (tree purpose, tree value, tree chain)
1018 struct list_proxy proxy;
1020 /* Hash the list node. */
1021 hashcode = list_hash_pieces (purpose, value, chain);
1022 /* Create a proxy for the TREE_LIST we would like to create. We
1023 don't actually create it so as to avoid creating garbage. */
1024 proxy.purpose = purpose;
1025 proxy.value = value;
1026 proxy.chain = chain;
1027 /* See if it is already in the table. */
1028 slot = htab_find_slot_with_hash (list_hash_table, &proxy, hashcode,
1030 /* If not, create a new node. */
1032 *slot = tree_cons (purpose, value, chain);
1033 return (tree) *slot;
1036 /* Constructor for hashed lists. */
1039 hash_tree_chain (tree value, tree chain)
1041 return hash_tree_cons (NULL_TREE, value, chain);
1045 debug_binfo (tree elem)
1050 fprintf (stderr, "type \"%s\", offset = " HOST_WIDE_INT_PRINT_DEC
1052 TYPE_NAME_STRING (BINFO_TYPE (elem)),
1053 TREE_INT_CST_LOW (BINFO_OFFSET (elem)));
1054 debug_tree (BINFO_TYPE (elem));
1055 if (BINFO_VTABLE (elem))
1056 fprintf (stderr, "vtable decl \"%s\"\n",
1057 IDENTIFIER_POINTER (DECL_NAME (get_vtbl_decl_for_binfo (elem))));
1059 fprintf (stderr, "no vtable decl yet\n");
1060 fprintf (stderr, "virtuals:\n");
1061 virtuals = BINFO_VIRTUALS (elem);
1066 tree fndecl = TREE_VALUE (virtuals);
1067 fprintf (stderr, "%s [%ld =? %ld]\n",
1068 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)),
1069 (long) n, (long) TREE_INT_CST_LOW (DECL_VINDEX (fndecl)));
1071 virtuals = TREE_CHAIN (virtuals);
1075 /* Build a representation for the qualified name SCOPE::NAME. TYPE is
1076 the type of the result expression, if known, or NULL_TREE if the
1077 resulting expression is type-dependent. If TEMPLATE_P is true,
1078 NAME is known to be a template because the user explicitly used the
1079 "template" keyword after the "::".
1081 All SCOPE_REFs should be built by use of this function. */
1084 build_qualified_name (tree type, tree scope, tree name, bool template_p)
1087 if (type == error_mark_node
1088 || scope == error_mark_node
1089 || name == error_mark_node)
1090 return error_mark_node;
1091 t = build2 (SCOPE_REF, type, scope, name);
1092 QUALIFIED_NAME_IS_TEMPLATE (t) = template_p;
1096 /* Returns nonzero if X is an expression for a (possibly overloaded)
1097 function. If "f" is a function or function template, "f", "c->f",
1098 "c.f", "C::f", and "f<int>" will all be considered possibly
1099 overloaded functions. Returns 2 if the function is actually
1100 overloaded, i.e., if it is impossible to know the type of the
1101 function without performing overload resolution. */
1104 is_overloaded_fn (tree x)
1106 /* A baselink is also considered an overloaded function. */
1107 if (TREE_CODE (x) == OFFSET_REF
1108 || TREE_CODE (x) == COMPONENT_REF)
1109 x = TREE_OPERAND (x, 1);
1111 x = BASELINK_FUNCTIONS (x);
1112 if (TREE_CODE (x) == TEMPLATE_ID_EXPR
1113 || DECL_FUNCTION_TEMPLATE_P (OVL_CURRENT (x))
1114 || (TREE_CODE (x) == OVERLOAD && OVL_CHAIN (x)))
1116 return (TREE_CODE (x) == FUNCTION_DECL
1117 || TREE_CODE (x) == OVERLOAD);
1120 /* Returns true iff X is an expression for an overloaded function
1121 whose type cannot be known without performing overload
1125 really_overloaded_fn (tree x)
1127 return is_overloaded_fn (x) == 2;
1131 get_first_fn (tree from)
1133 gcc_assert (is_overloaded_fn (from));
1134 /* A baselink is also considered an overloaded function. */
1135 if (TREE_CODE (from) == COMPONENT_REF)
1136 from = TREE_OPERAND (from, 1);
1137 if (BASELINK_P (from))
1138 from = BASELINK_FUNCTIONS (from);
1139 return OVL_CURRENT (from);
1142 /* Return a new OVL node, concatenating it with the old one. */
1145 ovl_cons (tree decl, tree chain)
1147 tree result = make_node (OVERLOAD);
1148 TREE_TYPE (result) = unknown_type_node;
1149 OVL_FUNCTION (result) = decl;
1150 TREE_CHAIN (result) = chain;
1155 /* Build a new overloaded function. If this is the first one,
1156 just return it; otherwise, ovl_cons the _DECLs */
1159 build_overload (tree decl, tree chain)
1161 if (! chain && TREE_CODE (decl) != TEMPLATE_DECL)
1163 if (chain && TREE_CODE (chain) != OVERLOAD)
1164 chain = ovl_cons (chain, NULL_TREE);
1165 return ovl_cons (decl, chain);
1169 #define PRINT_RING_SIZE 4
1172 cxx_printable_name (tree decl, int v)
1174 static unsigned int uid_ring[PRINT_RING_SIZE];
1175 static char *print_ring[PRINT_RING_SIZE];
1176 static int ring_counter;
1179 /* Only cache functions. */
1181 || TREE_CODE (decl) != FUNCTION_DECL
1182 || DECL_LANG_SPECIFIC (decl) == 0)
1183 return lang_decl_name (decl, v);
1185 /* See if this print name is lying around. */
1186 for (i = 0; i < PRINT_RING_SIZE; i++)
1187 if (uid_ring[i] == DECL_UID (decl))
1188 /* yes, so return it. */
1189 return print_ring[i];
1191 if (++ring_counter == PRINT_RING_SIZE)
1194 if (current_function_decl != NULL_TREE)
1196 if (uid_ring[ring_counter] == DECL_UID (current_function_decl))
1198 if (ring_counter == PRINT_RING_SIZE)
1200 gcc_assert (uid_ring[ring_counter] != DECL_UID (current_function_decl));
1203 if (print_ring[ring_counter])
1204 free (print_ring[ring_counter]);
1206 print_ring[ring_counter] = xstrdup (lang_decl_name (decl, v));
1207 uid_ring[ring_counter] = DECL_UID (decl);
1208 return print_ring[ring_counter];
1211 /* Build the FUNCTION_TYPE or METHOD_TYPE which may throw exceptions
1212 listed in RAISES. */
1215 build_exception_variant (tree type, tree raises)
1217 tree v = TYPE_MAIN_VARIANT (type);
1218 int type_quals = TYPE_QUALS (type);
1220 for (; v; v = TYPE_NEXT_VARIANT (v))
1221 if (check_qualified_type (v, type, type_quals)
1222 && comp_except_specs (raises, TYPE_RAISES_EXCEPTIONS (v), 1))
1225 /* Need to build a new variant. */
1226 v = build_variant_type_copy (type);
1227 TYPE_RAISES_EXCEPTIONS (v) = raises;
1231 /* Given a TEMPLATE_TEMPLATE_PARM node T, create a new
1232 BOUND_TEMPLATE_TEMPLATE_PARM bound with NEWARGS as its template
1236 bind_template_template_parm (tree t, tree newargs)
1238 tree decl = TYPE_NAME (t);
1241 t2 = make_aggr_type (BOUND_TEMPLATE_TEMPLATE_PARM);
1242 decl = build_decl (TYPE_DECL, DECL_NAME (decl), NULL_TREE);
1244 /* These nodes have to be created to reflect new TYPE_DECL and template
1246 TEMPLATE_TYPE_PARM_INDEX (t2) = copy_node (TEMPLATE_TYPE_PARM_INDEX (t));
1247 TEMPLATE_PARM_DECL (TEMPLATE_TYPE_PARM_INDEX (t2)) = decl;
1248 TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (t2)
1249 = tree_cons (TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL (t),
1250 newargs, NULL_TREE);
1252 TREE_TYPE (decl) = t2;
1253 TYPE_NAME (t2) = decl;
1254 TYPE_STUB_DECL (t2) = decl;
1256 SET_TYPE_STRUCTURAL_EQUALITY (t2);
1261 /* Called from count_trees via walk_tree. */
1264 count_trees_r (tree *tp, int *walk_subtrees, void *data)
1274 /* Debugging function for measuring the rough complexity of a tree
1278 count_trees (tree t)
1281 cp_walk_tree_without_duplicates (&t, count_trees_r, &n_trees);
1285 /* Called from verify_stmt_tree via walk_tree. */
1288 verify_stmt_tree_r (tree* tp,
1289 int* walk_subtrees ATTRIBUTE_UNUSED ,
1293 htab_t *statements = (htab_t *) data;
1296 if (!STATEMENT_CODE_P (TREE_CODE (t)))
1299 /* If this statement is already present in the hash table, then
1300 there is a circularity in the statement tree. */
1301 gcc_assert (!htab_find (*statements, t));
1303 slot = htab_find_slot (*statements, t, INSERT);
1309 /* Debugging function to check that the statement T has not been
1310 corrupted. For now, this function simply checks that T contains no
1314 verify_stmt_tree (tree t)
1317 statements = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
1318 cp_walk_tree (&t, verify_stmt_tree_r, &statements, NULL);
1319 htab_delete (statements);
1322 /* Check if the type T depends on a type with no linkage and if so, return
1323 it. If RELAXED_P then do not consider a class type declared within
1324 a TREE_PUBLIC function to have no linkage. */
1327 no_linkage_check (tree t, bool relaxed_p)
1331 /* There's no point in checking linkage on template functions; we
1332 can't know their complete types. */
1333 if (processing_template_decl)
1336 switch (TREE_CODE (t))
1341 if (TYPE_PTRMEMFUNC_P (t))
1345 if (!CLASS_TYPE_P (t))
1349 if (TYPE_ANONYMOUS_P (t))
1351 fn = decl_function_context (TYPE_MAIN_DECL (t));
1352 if (fn && (!relaxed_p || !TREE_PUBLIC (fn)))
1358 case REFERENCE_TYPE:
1359 return no_linkage_check (TREE_TYPE (t), relaxed_p);
1363 r = no_linkage_check (TYPE_PTRMEM_POINTED_TO_TYPE (t),
1367 return no_linkage_check (TYPE_PTRMEM_CLASS_TYPE (t), relaxed_p);
1370 r = no_linkage_check (TYPE_METHOD_BASETYPE (t), relaxed_p);
1377 for (parm = TYPE_ARG_TYPES (t);
1378 parm && parm != void_list_node;
1379 parm = TREE_CHAIN (parm))
1381 r = no_linkage_check (TREE_VALUE (parm), relaxed_p);
1385 return no_linkage_check (TREE_TYPE (t), relaxed_p);
1393 #ifdef GATHER_STATISTICS
1394 extern int depth_reached;
1398 cxx_print_statistics (void)
1400 print_search_statistics ();
1401 print_class_statistics ();
1402 #ifdef GATHER_STATISTICS
1403 fprintf (stderr, "maximum template instantiation depth reached: %d\n",
1408 /* Return, as an INTEGER_CST node, the number of elements for TYPE
1409 (which is an ARRAY_TYPE). This counts only elements of the top
1413 array_type_nelts_top (tree type)
1415 return fold_build2 (PLUS_EXPR, sizetype,
1416 array_type_nelts (type),
1420 /* Return, as an INTEGER_CST node, the number of elements for TYPE
1421 (which is an ARRAY_TYPE). This one is a recursive count of all
1422 ARRAY_TYPEs that are clumped together. */
1425 array_type_nelts_total (tree type)
1427 tree sz = array_type_nelts_top (type);
1428 type = TREE_TYPE (type);
1429 while (TREE_CODE (type) == ARRAY_TYPE)
1431 tree n = array_type_nelts_top (type);
1432 sz = fold_build2 (MULT_EXPR, sizetype, sz, n);
1433 type = TREE_TYPE (type);
1438 /* Called from break_out_target_exprs via mapcar. */
1441 bot_manip (tree* tp, int* walk_subtrees, void* data)
1443 splay_tree target_remap = ((splay_tree) data);
1446 if (!TYPE_P (t) && TREE_CONSTANT (t))
1448 /* There can't be any TARGET_EXPRs or their slot variables below
1449 this point. We used to check !TREE_SIDE_EFFECTS, but then we
1450 failed to copy an ADDR_EXPR of the slot VAR_DECL. */
1454 if (TREE_CODE (t) == TARGET_EXPR)
1458 if (TREE_CODE (TREE_OPERAND (t, 1)) == AGGR_INIT_EXPR)
1459 u = build_cplus_new (TREE_TYPE (t), TREE_OPERAND (t, 1));
1461 u = build_target_expr_with_type (TREE_OPERAND (t, 1), TREE_TYPE (t));
1463 /* Map the old variable to the new one. */
1464 splay_tree_insert (target_remap,
1465 (splay_tree_key) TREE_OPERAND (t, 0),
1466 (splay_tree_value) TREE_OPERAND (u, 0));
1468 TREE_OPERAND (u, 1) = break_out_target_exprs (TREE_OPERAND (u, 1));
1470 /* Replace the old expression with the new version. */
1472 /* We don't have to go below this point; the recursive call to
1473 break_out_target_exprs will have handled anything below this
1479 /* Make a copy of this node. */
1480 return copy_tree_r (tp, walk_subtrees, NULL);
1483 /* Replace all remapped VAR_DECLs in T with their new equivalents.
1484 DATA is really a splay-tree mapping old variables to new
1488 bot_replace (tree* t,
1489 int* walk_subtrees ATTRIBUTE_UNUSED ,
1492 splay_tree target_remap = ((splay_tree) data);
1494 if (TREE_CODE (*t) == VAR_DECL)
1496 splay_tree_node n = splay_tree_lookup (target_remap,
1497 (splay_tree_key) *t);
1499 *t = (tree) n->value;
1505 /* When we parse a default argument expression, we may create
1506 temporary variables via TARGET_EXPRs. When we actually use the
1507 default-argument expression, we make a copy of the expression, but
1508 we must replace the temporaries with appropriate local versions. */
1511 break_out_target_exprs (tree t)
1513 static int target_remap_count;
1514 static splay_tree target_remap;
1516 if (!target_remap_count++)
1517 target_remap = splay_tree_new (splay_tree_compare_pointers,
1518 /*splay_tree_delete_key_fn=*/NULL,
1519 /*splay_tree_delete_value_fn=*/NULL);
1520 cp_walk_tree (&t, bot_manip, target_remap, NULL);
1521 cp_walk_tree (&t, bot_replace, target_remap, NULL);
1523 if (!--target_remap_count)
1525 splay_tree_delete (target_remap);
1526 target_remap = NULL;
1532 /* Similar to `build_nt', but for template definitions of dependent
1536 build_min_nt (enum tree_code code, ...)
1543 gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);
1547 t = make_node (code);
1548 length = TREE_CODE_LENGTH (code);
1550 for (i = 0; i < length; i++)
1552 tree x = va_arg (p, tree);
1553 TREE_OPERAND (t, i) = x;
1561 /* Similar to `build', but for template definitions. */
1564 build_min (enum tree_code code, tree tt, ...)
1571 gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);
1575 t = make_node (code);
1576 length = TREE_CODE_LENGTH (code);
1579 for (i = 0; i < length; i++)
1581 tree x = va_arg (p, tree);
1582 TREE_OPERAND (t, i) = x;
1583 if (x && !TYPE_P (x) && TREE_SIDE_EFFECTS (x))
1584 TREE_SIDE_EFFECTS (t) = 1;
1591 /* Similar to `build', but for template definitions of non-dependent
1592 expressions. NON_DEP is the non-dependent expression that has been
1596 build_min_non_dep (enum tree_code code, tree non_dep, ...)
1603 gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);
1605 va_start (p, non_dep);
1607 t = make_node (code);
1608 length = TREE_CODE_LENGTH (code);
1609 TREE_TYPE (t) = TREE_TYPE (non_dep);
1610 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (non_dep);
1612 for (i = 0; i < length; i++)
1614 tree x = va_arg (p, tree);
1615 TREE_OPERAND (t, i) = x;
1618 if (code == COMPOUND_EXPR && TREE_CODE (non_dep) != COMPOUND_EXPR)
1619 /* This should not be considered a COMPOUND_EXPR, because it
1620 resolves to an overload. */
1621 COMPOUND_EXPR_OVERLOADED (t) = 1;
1627 /* Similar to `build_call_list', but for template definitions of non-dependent
1628 expressions. NON_DEP is the non-dependent expression that has been
1632 build_min_non_dep_call_list (tree non_dep, tree fn, tree arglist)
1634 tree t = build_nt_call_list (fn, arglist);
1635 TREE_TYPE (t) = TREE_TYPE (non_dep);
1636 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (non_dep);
1641 get_type_decl (tree t)
1643 if (TREE_CODE (t) == TYPE_DECL)
1646 return TYPE_STUB_DECL (t);
1647 gcc_assert (t == error_mark_node);
1651 /* Returns the namespace that contains DECL, whether directly or
1655 decl_namespace_context (tree decl)
1659 if (TREE_CODE (decl) == NAMESPACE_DECL)
1661 else if (TYPE_P (decl))
1662 decl = CP_DECL_CONTEXT (TYPE_MAIN_DECL (decl));
1664 decl = CP_DECL_CONTEXT (decl);
1668 /* Returns true if decl is within an anonymous namespace, however deeply
1669 nested, or false otherwise. */
1672 decl_anon_ns_mem_p (const_tree decl)
1676 if (decl == NULL_TREE || decl == error_mark_node)
1678 if (TREE_CODE (decl) == NAMESPACE_DECL
1679 && DECL_NAME (decl) == NULL_TREE)
1681 /* Classes and namespaces inside anonymous namespaces have
1682 TREE_PUBLIC == 0, so we can shortcut the search. */
1683 else if (TYPE_P (decl))
1684 return (TREE_PUBLIC (TYPE_NAME (decl)) == 0);
1685 else if (TREE_CODE (decl) == NAMESPACE_DECL)
1686 return (TREE_PUBLIC (decl) == 0);
1688 decl = DECL_CONTEXT (decl);
1692 /* Return truthvalue of whether T1 is the same tree structure as T2.
1693 Return 1 if they are the same. Return 0 if they are different. */
1696 cp_tree_equal (tree t1, tree t2)
1698 enum tree_code code1, code2;
1705 for (code1 = TREE_CODE (t1);
1706 code1 == NOP_EXPR || code1 == CONVERT_EXPR
1707 || code1 == NON_LVALUE_EXPR;
1708 code1 = TREE_CODE (t1))
1709 t1 = TREE_OPERAND (t1, 0);
1710 for (code2 = TREE_CODE (t2);
1711 code2 == NOP_EXPR || code2 == CONVERT_EXPR
1712 || code1 == NON_LVALUE_EXPR;
1713 code2 = TREE_CODE (t2))
1714 t2 = TREE_OPERAND (t2, 0);
1716 /* They might have become equal now. */
1726 return TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
1727 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2);
1730 return REAL_VALUES_EQUAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
1733 return TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
1734 && !memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
1735 TREE_STRING_LENGTH (t1));
1738 return cp_tree_equal (TREE_REALPART (t1), TREE_REALPART (t2))
1739 && cp_tree_equal (TREE_IMAGPART (t1), TREE_IMAGPART (t2));
1742 /* We need to do this when determining whether or not two
1743 non-type pointer to member function template arguments
1745 if (!(same_type_p (TREE_TYPE (t1), TREE_TYPE (t2))
1746 /* The first operand is RTL. */
1747 && TREE_OPERAND (t1, 0) == TREE_OPERAND (t2, 0)))
1749 return cp_tree_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
1752 if (!cp_tree_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2)))
1754 if (!cp_tree_equal (TREE_VALUE (t1), TREE_VALUE (t2)))
1756 return cp_tree_equal (TREE_CHAIN (t1), TREE_CHAIN (t2));
1759 return cp_tree_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
1764 call_expr_arg_iterator iter1, iter2;
1765 if (!cp_tree_equal (CALL_EXPR_FN (t1), CALL_EXPR_FN (t2)))
1767 for (arg1 = first_call_expr_arg (t1, &iter1),
1768 arg2 = first_call_expr_arg (t2, &iter2);
1770 arg1 = next_call_expr_arg (&iter1),
1771 arg2 = next_call_expr_arg (&iter2))
1772 if (!cp_tree_equal (arg1, arg2))
1774 return (arg1 || arg2);
1779 tree o1 = TREE_OPERAND (t1, 0);
1780 tree o2 = TREE_OPERAND (t2, 0);
1782 /* Special case: if either target is an unallocated VAR_DECL,
1783 it means that it's going to be unified with whatever the
1784 TARGET_EXPR is really supposed to initialize, so treat it
1785 as being equivalent to anything. */
1786 if (TREE_CODE (o1) == VAR_DECL && DECL_NAME (o1) == NULL_TREE
1787 && !DECL_RTL_SET_P (o1))
1789 else if (TREE_CODE (o2) == VAR_DECL && DECL_NAME (o2) == NULL_TREE
1790 && !DECL_RTL_SET_P (o2))
1792 else if (!cp_tree_equal (o1, o2))
1795 return cp_tree_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
1798 case WITH_CLEANUP_EXPR:
1799 if (!cp_tree_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)))
1801 return cp_tree_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t1, 1));
1804 if (TREE_OPERAND (t1, 1) != TREE_OPERAND (t2, 1))
1806 return cp_tree_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
1813 case IDENTIFIER_NODE:
1818 return (BASELINK_BINFO (t1) == BASELINK_BINFO (t2)
1819 && BASELINK_ACCESS_BINFO (t1) == BASELINK_ACCESS_BINFO (t2)
1820 && cp_tree_equal (BASELINK_FUNCTIONS (t1),
1821 BASELINK_FUNCTIONS (t2)));
1823 case TEMPLATE_PARM_INDEX:
1824 return (TEMPLATE_PARM_IDX (t1) == TEMPLATE_PARM_IDX (t2)
1825 && TEMPLATE_PARM_LEVEL (t1) == TEMPLATE_PARM_LEVEL (t2)
1826 && same_type_p (TREE_TYPE (TEMPLATE_PARM_DECL (t1)),
1827 TREE_TYPE (TEMPLATE_PARM_DECL (t2))));
1829 case TEMPLATE_ID_EXPR:
1834 if (!cp_tree_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)))
1836 vec1 = TREE_OPERAND (t1, 1);
1837 vec2 = TREE_OPERAND (t2, 1);
1840 return !vec1 && !vec2;
1842 if (TREE_VEC_LENGTH (vec1) != TREE_VEC_LENGTH (vec2))
1845 for (ix = TREE_VEC_LENGTH (vec1); ix--;)
1846 if (!cp_tree_equal (TREE_VEC_ELT (vec1, ix),
1847 TREE_VEC_ELT (vec2, ix)))
1856 tree o1 = TREE_OPERAND (t1, 0);
1857 tree o2 = TREE_OPERAND (t2, 0);
1859 if (TREE_CODE (o1) != TREE_CODE (o2))
1862 return same_type_p (o1, o2);
1864 return cp_tree_equal (o1, o2);
1869 tree t1_op1, t2_op1;
1871 if (!cp_tree_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)))
1874 t1_op1 = TREE_OPERAND (t1, 1);
1875 t2_op1 = TREE_OPERAND (t2, 1);
1876 if (TREE_CODE (t1_op1) != TREE_CODE (t2_op1))
1879 return cp_tree_equal (TREE_OPERAND (t1, 2), TREE_OPERAND (t2, 2));
1883 /* Two pointer-to-members are the same if they point to the same
1884 field or function in the same class. */
1885 if (PTRMEM_CST_MEMBER (t1) != PTRMEM_CST_MEMBER (t2))
1888 return same_type_p (PTRMEM_CST_CLASS (t1), PTRMEM_CST_CLASS (t2));
1891 if (OVL_FUNCTION (t1) != OVL_FUNCTION (t2))
1893 return cp_tree_equal (OVL_CHAIN (t1), OVL_CHAIN (t2));
1896 if (TRAIT_EXPR_KIND (t1) != TRAIT_EXPR_KIND (t2))
1898 return same_type_p (TRAIT_EXPR_TYPE1 (t1), TRAIT_EXPR_TYPE1 (t2))
1899 && same_type_p (TRAIT_EXPR_TYPE2 (t1), TRAIT_EXPR_TYPE2 (t2));
1905 switch (TREE_CODE_CLASS (code1))
1909 case tcc_comparison:
1910 case tcc_expression:
1917 n = TREE_OPERAND_LENGTH (t1);
1918 if (TREE_CODE_CLASS (code1) == tcc_vl_exp
1919 && n != TREE_OPERAND_LENGTH (t2))
1922 for (i = 0; i < n; ++i)
1923 if (!cp_tree_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i)))
1930 return same_type_p (t1, t2);
1934 /* We can get here with --disable-checking. */
1938 /* The type of ARG when used as an lvalue. */
1941 lvalue_type (tree arg)
1943 tree type = TREE_TYPE (arg);
1947 /* The type of ARG for printing error messages; denote lvalues with
1951 error_type (tree arg)
1953 tree type = TREE_TYPE (arg);
1955 if (TREE_CODE (type) == ARRAY_TYPE)
1957 else if (TREE_CODE (type) == ERROR_MARK)
1959 else if (real_lvalue_p (arg))
1960 type = build_reference_type (lvalue_type (arg));
1961 else if (IS_AGGR_TYPE (type))
1962 type = lvalue_type (arg);
1967 /* Does FUNCTION use a variable-length argument list? */
1970 varargs_function_p (const_tree function)
1972 const_tree parm = TYPE_ARG_TYPES (TREE_TYPE (function));
1973 for (; parm; parm = TREE_CHAIN (parm))
1974 if (TREE_VALUE (parm) == void_type_node)
1979 /* Returns 1 if decl is a member of a class. */
1982 member_p (const_tree decl)
1984 const_tree const ctx = DECL_CONTEXT (decl);
1985 return (ctx && TYPE_P (ctx));
1988 /* Create a placeholder for member access where we don't actually have an
1989 object that the access is against. */
1992 build_dummy_object (tree type)
1994 tree decl = build1 (NOP_EXPR, build_pointer_type (type), void_zero_node);
1995 return build_indirect_ref (decl, NULL);
1998 /* We've gotten a reference to a member of TYPE. Return *this if appropriate,
1999 or a dummy object otherwise. If BINFOP is non-0, it is filled with the
2000 binfo path from current_class_type to TYPE, or 0. */
2003 maybe_dummy_object (tree type, tree* binfop)
2008 if (current_class_type
2009 && (binfo = lookup_base (current_class_type, type,
2010 ba_unique | ba_quiet, NULL)))
2011 context = current_class_type;
2014 /* Reference from a nested class member function. */
2016 binfo = TYPE_BINFO (type);
2022 if (current_class_ref && context == current_class_type
2023 /* Kludge: Make sure that current_class_type is actually
2024 correct. It might not be if we're in the middle of
2025 tsubst_default_argument. */
2026 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (current_class_ref)),
2027 current_class_type))
2028 decl = current_class_ref;
2030 decl = build_dummy_object (context);
2035 /* Returns 1 if OB is a placeholder object, or a pointer to one. */
2038 is_dummy_object (const_tree ob)
2040 if (TREE_CODE (ob) == INDIRECT_REF)
2041 ob = TREE_OPERAND (ob, 0);
2042 return (TREE_CODE (ob) == NOP_EXPR
2043 && TREE_OPERAND (ob, 0) == void_zero_node);
2046 /* Returns 1 iff type T is a POD type, as defined in [basic.types]. */
2049 pod_type_p (const_tree t)
2051 /* This CONST_CAST is okay because strip_array_types returns it's
2052 argument unmodified and we assign it to a const_tree. */
2053 t = strip_array_types (CONST_CAST_TREE(t));
2055 if (t == error_mark_node)
2057 if (INTEGRAL_TYPE_P (t))
2058 return 1; /* integral, character or enumeral type */
2059 if (FLOAT_TYPE_P (t))
2062 return 1; /* pointer to non-member */
2063 if (TYPE_PTR_TO_MEMBER_P (t))
2064 return 1; /* pointer to member */
2066 if (TREE_CODE (t) == VECTOR_TYPE)
2067 return 1; /* vectors are (small) arrays of scalars */
2069 if (! CLASS_TYPE_P (t))
2070 return 0; /* other non-class type (reference or function) */
2071 if (CLASSTYPE_NON_POD_P (t))
2076 /* Nonzero iff type T is a class template implicit specialization. */
2079 class_tmpl_impl_spec_p (const_tree t)
2081 return CLASS_TYPE_P (t) && CLASSTYPE_TEMPLATE_INSTANTIATION (t);
2084 /* Returns 1 iff zero initialization of type T means actually storing
2088 zero_init_p (const_tree t)
2090 /* This CONST_CAST is okay because strip_array_types returns it's
2091 argument unmodified and we assign it to a const_tree. */
2092 t = strip_array_types (CONST_CAST_TREE(t));
2094 if (t == error_mark_node)
2097 /* NULL pointers to data members are initialized with -1. */
2098 if (TYPE_PTRMEM_P (t))
2101 /* Classes that contain types that can't be zero-initialized, cannot
2102 be zero-initialized themselves. */
2103 if (CLASS_TYPE_P (t) && CLASSTYPE_NON_ZERO_INIT_P (t))
2109 /* Table of valid C++ attributes. */
2110 const struct attribute_spec cxx_attribute_table[] =
2112 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
2113 { "java_interface", 0, 0, false, false, false, handle_java_interface_attribute },
2114 { "com_interface", 0, 0, false, false, false, handle_com_interface_attribute },
2115 { "init_priority", 1, 1, true, false, false, handle_init_priority_attribute },
2116 { NULL, 0, 0, false, false, false, NULL }
2119 /* Handle a "java_interface" attribute; arguments as in
2120 struct attribute_spec.handler. */
2122 handle_java_interface_attribute (tree* node,
2124 tree args ATTRIBUTE_UNUSED ,
2129 || !CLASS_TYPE_P (*node)
2130 || !TYPE_FOR_JAVA (*node))
2132 error ("%qE attribute can only be applied to Java class definitions",
2134 *no_add_attrs = true;
2137 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
2138 *node = build_variant_type_copy (*node);
2139 TYPE_JAVA_INTERFACE (*node) = 1;
2144 /* Handle a "com_interface" attribute; arguments as in
2145 struct attribute_spec.handler. */
2147 handle_com_interface_attribute (tree* node,
2149 tree args ATTRIBUTE_UNUSED ,
2150 int flags ATTRIBUTE_UNUSED ,
2155 *no_add_attrs = true;
2158 || !CLASS_TYPE_P (*node)
2159 || *node != TYPE_MAIN_VARIANT (*node))
2161 warning (OPT_Wattributes, "%qE attribute can only be applied "
2162 "to class definitions", name);
2167 warning (0, "%qE is obsolete; g++ vtables are now COM-compatible by default",
2173 /* Handle an "init_priority" attribute; arguments as in
2174 struct attribute_spec.handler. */
2176 handle_init_priority_attribute (tree* node,
2179 int flags ATTRIBUTE_UNUSED ,
2182 tree initp_expr = TREE_VALUE (args);
2184 tree type = TREE_TYPE (decl);
2187 STRIP_NOPS (initp_expr);
2189 if (!initp_expr || TREE_CODE (initp_expr) != INTEGER_CST)
2191 error ("requested init_priority is not an integer constant");
2192 *no_add_attrs = true;
2196 pri = TREE_INT_CST_LOW (initp_expr);
2198 type = strip_array_types (type);
2200 if (decl == NULL_TREE
2201 || TREE_CODE (decl) != VAR_DECL
2202 || !TREE_STATIC (decl)
2203 || DECL_EXTERNAL (decl)
2204 || (TREE_CODE (type) != RECORD_TYPE
2205 && TREE_CODE (type) != UNION_TYPE)
2206 /* Static objects in functions are initialized the
2207 first time control passes through that
2208 function. This is not precise enough to pin down an
2209 init_priority value, so don't allow it. */
2210 || current_function_decl)
2212 error ("can only use %qE attribute on file-scope definitions "
2213 "of objects of class type", name);
2214 *no_add_attrs = true;
2218 if (pri > MAX_INIT_PRIORITY || pri <= 0)
2220 error ("requested init_priority is out of range");
2221 *no_add_attrs = true;
2225 /* Check for init_priorities that are reserved for
2226 language and runtime support implementations.*/
2227 if (pri <= MAX_RESERVED_INIT_PRIORITY)
2230 (0, "requested init_priority is reserved for internal use");
2233 if (SUPPORTS_INIT_PRIORITY)
2235 SET_DECL_INIT_PRIORITY (decl, pri);
2236 DECL_HAS_INIT_PRIORITY_P (decl) = 1;
2241 error ("%qE attribute is not supported on this platform", name);
2242 *no_add_attrs = true;
2247 /* Return a new PTRMEM_CST of the indicated TYPE. The MEMBER is the
2248 thing pointed to by the constant. */
2251 make_ptrmem_cst (tree type, tree member)
2253 tree ptrmem_cst = make_node (PTRMEM_CST);
2254 TREE_TYPE (ptrmem_cst) = type;
2255 PTRMEM_CST_MEMBER (ptrmem_cst) = member;
2259 /* Build a variant of TYPE that has the indicated ATTRIBUTES. May
2260 return an existing type if an appropriate type already exists. */
2263 cp_build_type_attribute_variant (tree type, tree attributes)
2267 new_type = build_type_attribute_variant (type, attributes);
2268 if (TREE_CODE (new_type) == FUNCTION_TYPE
2269 && (TYPE_RAISES_EXCEPTIONS (new_type)
2270 != TYPE_RAISES_EXCEPTIONS (type)))
2271 new_type = build_exception_variant (new_type,
2272 TYPE_RAISES_EXCEPTIONS (type));
2274 /* Making a new main variant of a class type is broken. */
2275 gcc_assert (!CLASS_TYPE_P (type) || new_type == type);
2280 /* Return TRUE if TYPE1 and TYPE2 are identical for type hashing purposes.
2281 Called only after doing all language independent checks. Only
2282 to check TYPE_RAISES_EXCEPTIONS for FUNCTION_TYPE, the rest is already
2283 compared in type_hash_eq. */
2286 cxx_type_hash_eq (const_tree typea, const_tree typeb)
2288 gcc_assert (TREE_CODE (typea) == FUNCTION_TYPE);
2290 return comp_except_specs (TYPE_RAISES_EXCEPTIONS (typea),
2291 TYPE_RAISES_EXCEPTIONS (typeb), 1);
2294 /* Apply FUNC to all language-specific sub-trees of TP in a pre-order
2295 traversal. Called from walk_tree. */
2298 cp_walk_subtrees (tree *tp, int *walk_subtrees_p, walk_tree_fn func,
2299 void *data, struct pointer_set_t *pset)
2301 enum tree_code code = TREE_CODE (*tp);
2304 #define WALK_SUBTREE(NODE) \
2307 result = cp_walk_tree (&(NODE), func, data, pset); \
2308 if (result) goto out; \
2312 /* Not one of the easy cases. We must explicitly go through the
2318 case TEMPLATE_TEMPLATE_PARM:
2319 case BOUND_TEMPLATE_TEMPLATE_PARM:
2320 case UNBOUND_CLASS_TEMPLATE:
2321 case TEMPLATE_PARM_INDEX:
2322 case TEMPLATE_TYPE_PARM:
2325 /* None of these have subtrees other than those already walked
2327 *walk_subtrees_p = 0;
2331 WALK_SUBTREE (BASELINK_FUNCTIONS (*tp));
2332 *walk_subtrees_p = 0;
2336 WALK_SUBTREE (TREE_TYPE (*tp));
2337 *walk_subtrees_p = 0;
2341 WALK_SUBTREE (TREE_PURPOSE (*tp));
2345 WALK_SUBTREE (OVL_FUNCTION (*tp));
2346 WALK_SUBTREE (OVL_CHAIN (*tp));
2347 *walk_subtrees_p = 0;
2351 WALK_SUBTREE (DECL_NAME (*tp));
2352 WALK_SUBTREE (USING_DECL_SCOPE (*tp));
2353 WALK_SUBTREE (USING_DECL_DECLS (*tp));
2354 *walk_subtrees_p = 0;
2358 if (TYPE_PTRMEMFUNC_P (*tp))
2359 WALK_SUBTREE (TYPE_PTRMEMFUNC_FN_TYPE (*tp));
2362 case TYPE_ARGUMENT_PACK:
2363 case NONTYPE_ARGUMENT_PACK:
2365 tree args = ARGUMENT_PACK_ARGS (*tp);
2366 int i, len = TREE_VEC_LENGTH (args);
2367 for (i = 0; i < len; i++)
2368 WALK_SUBTREE (TREE_VEC_ELT (args, i));
2372 case TYPE_PACK_EXPANSION:
2373 WALK_SUBTREE (TREE_TYPE (*tp));
2374 *walk_subtrees_p = 0;
2377 case EXPR_PACK_EXPANSION:
2378 WALK_SUBTREE (TREE_OPERAND (*tp, 0));
2379 *walk_subtrees_p = 0;
2383 if (TREE_TYPE (*tp))
2384 WALK_SUBTREE (TREE_TYPE (*tp));
2388 for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (*tp)); ++i)
2389 WALK_SUBTREE (TREE_OPERAND (*tp, i));
2391 *walk_subtrees_p = 0;
2395 WALK_SUBTREE (TRAIT_EXPR_TYPE1 (*tp));
2396 WALK_SUBTREE (TRAIT_EXPR_TYPE2 (*tp));
2397 *walk_subtrees_p = 0;
2401 WALK_SUBTREE (DECLTYPE_TYPE_EXPR (*tp));
2402 *walk_subtrees_p = 0;
2410 /* We didn't find what we were looking for. */
2417 /* Like save_expr, but for C++. */
2420 cp_save_expr (tree expr)
2422 /* There is no reason to create a SAVE_EXPR within a template; if
2423 needed, we can create the SAVE_EXPR when instantiating the
2424 template. Furthermore, the middle-end cannot handle C++-specific
2426 if (processing_template_decl)
2428 return save_expr (expr);
2431 /* Initialize tree.c. */
2436 list_hash_table = htab_create_ggc (31, list_hash, list_hash_eq, NULL);
2439 /* Returns the kind of special function that DECL (a FUNCTION_DECL)
2440 is. Note that sfk_none is zero, so this function can be used as a
2441 predicate to test whether or not DECL is a special function. */
2443 special_function_kind
2444 special_function_p (const_tree decl)
2446 /* Rather than doing all this stuff with magic names, we should
2447 probably have a field of type `special_function_kind' in
2448 DECL_LANG_SPECIFIC. */
2449 if (DECL_COPY_CONSTRUCTOR_P (decl))
2450 return sfk_copy_constructor;
2451 if (DECL_CONSTRUCTOR_P (decl))
2452 return sfk_constructor;
2453 if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
2454 return sfk_assignment_operator;
2455 if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2456 return sfk_destructor;
2457 if (DECL_COMPLETE_DESTRUCTOR_P (decl))
2458 return sfk_complete_destructor;
2459 if (DECL_BASE_DESTRUCTOR_P (decl))
2460 return sfk_base_destructor;
2461 if (DECL_DELETING_DESTRUCTOR_P (decl))
2462 return sfk_deleting_destructor;
2463 if (DECL_CONV_FN_P (decl))
2464 return sfk_conversion;
2469 /* Returns nonzero if TYPE is a character type, including wchar_t. */
2472 char_type_p (tree type)
2474 return (same_type_p (type, char_type_node)
2475 || same_type_p (type, unsigned_char_type_node)
2476 || same_type_p (type, signed_char_type_node)
2477 || same_type_p (type, wchar_type_node));
2480 /* Returns the kind of linkage associated with the indicated DECL. Th
2481 value returned is as specified by the language standard; it is
2482 independent of implementation details regarding template
2483 instantiation, etc. For example, it is possible that a declaration
2484 to which this function assigns external linkage would not show up
2485 as a global symbol when you run `nm' on the resulting object file. */
2488 decl_linkage (tree decl)
2490 /* This function doesn't attempt to calculate the linkage from first
2491 principles as given in [basic.link]. Instead, it makes use of
2492 the fact that we have already set TREE_PUBLIC appropriately, and
2493 then handles a few special cases. Ideally, we would calculate
2494 linkage first, and then transform that into a concrete
2497 /* Things that don't have names have no linkage. */
2498 if (!DECL_NAME (decl))
2501 /* Fields have no linkage. */
2502 if (TREE_CODE (decl) == FIELD_DECL)
2505 /* Things that are TREE_PUBLIC have external linkage. */
2506 if (TREE_PUBLIC (decl))
2509 if (TREE_CODE (decl) == NAMESPACE_DECL)
2512 /* Linkage of a CONST_DECL depends on the linkage of the enumeration
2514 if (TREE_CODE (decl) == CONST_DECL)
2515 return decl_linkage (TYPE_NAME (TREE_TYPE (decl)));
2517 /* Some things that are not TREE_PUBLIC have external linkage, too.
2518 For example, on targets that don't have weak symbols, we make all
2519 template instantiations have internal linkage (in the object
2520 file), but the symbols should still be treated as having external
2521 linkage from the point of view of the language. */
2522 if (TREE_CODE (decl) != TYPE_DECL && DECL_LANG_SPECIFIC (decl)
2523 && DECL_COMDAT (decl))
2526 /* Things in local scope do not have linkage, if they don't have
2528 if (decl_function_context (decl))
2531 /* Members of the anonymous namespace also have TREE_PUBLIC unset, but
2532 are considered to have external linkage for language purposes. DECLs
2533 really meant to have internal linkage have DECL_THIS_STATIC set. */
2534 if (TREE_CODE (decl) == TYPE_DECL)
2536 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
2538 if (!DECL_THIS_STATIC (decl))
2541 /* Static data members and static member functions from classes
2542 in anonymous namespace also don't have TREE_PUBLIC set. */
2543 if (DECL_CLASS_CONTEXT (decl))
2547 /* Everything else has internal linkage. */
2551 /* EXP is an expression that we want to pre-evaluate. Returns (in
2552 *INITP) an expression that will perform the pre-evaluation. The
2553 value returned by this function is a side-effect free expression
2554 equivalent to the pre-evaluated expression. Callers must ensure
2555 that *INITP is evaluated before EXP. */
2558 stabilize_expr (tree exp, tree* initp)
2562 if (!TREE_SIDE_EFFECTS (exp))
2563 init_expr = NULL_TREE;
2564 else if (!real_lvalue_p (exp)
2565 || !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (exp)))
2567 init_expr = get_target_expr (exp);
2568 exp = TARGET_EXPR_SLOT (init_expr);
2572 exp = build_unary_op (ADDR_EXPR, exp, 1);
2573 init_expr = get_target_expr (exp);
2574 exp = TARGET_EXPR_SLOT (init_expr);
2575 exp = build_indirect_ref (exp, 0);
2579 gcc_assert (!TREE_SIDE_EFFECTS (exp));
2583 /* Add NEW, an expression whose value we don't care about, after the
2584 similar expression ORIG. */
2587 add_stmt_to_compound (tree orig, tree new)
2589 if (!new || !TREE_SIDE_EFFECTS (new))
2591 if (!orig || !TREE_SIDE_EFFECTS (orig))
2593 return build2 (COMPOUND_EXPR, void_type_node, orig, new);
2596 /* Like stabilize_expr, but for a call whose arguments we want to
2597 pre-evaluate. CALL is modified in place to use the pre-evaluated
2598 arguments, while, upon return, *INITP contains an expression to
2599 compute the arguments. */
2602 stabilize_call (tree call, tree *initp)
2604 tree inits = NULL_TREE;
2606 int nargs = call_expr_nargs (call);
2608 if (call == error_mark_node || processing_template_decl)
2614 gcc_assert (TREE_CODE (call) == CALL_EXPR);
2616 for (i = 0; i < nargs; i++)
2619 CALL_EXPR_ARG (call, i) =
2620 stabilize_expr (CALL_EXPR_ARG (call, i), &init);
2621 inits = add_stmt_to_compound (inits, init);
2627 /* Like stabilize_expr, but for an AGGR_INIT_EXPR whose arguments we want
2628 to pre-evaluate. CALL is modified in place to use the pre-evaluated
2629 arguments, while, upon return, *INITP contains an expression to
2630 compute the arguments. */
2633 stabilize_aggr_init (tree call, tree *initp)
2635 tree inits = NULL_TREE;
2637 int nargs = aggr_init_expr_nargs (call);
2639 if (call == error_mark_node)
2642 gcc_assert (TREE_CODE (call) == AGGR_INIT_EXPR);
2644 for (i = 0; i < nargs; i++)
2647 AGGR_INIT_EXPR_ARG (call, i) =
2648 stabilize_expr (AGGR_INIT_EXPR_ARG (call, i), &init);
2649 inits = add_stmt_to_compound (inits, init);
2655 /* Like stabilize_expr, but for an initialization.
2657 If the initialization is for an object of class type, this function
2658 takes care not to introduce additional temporaries.
2660 Returns TRUE iff the expression was successfully pre-evaluated,
2661 i.e., if INIT is now side-effect free, except for, possible, a
2662 single call to a constructor. */
2665 stabilize_init (tree init, tree *initp)
2671 if (t == error_mark_node || processing_template_decl)
2674 if (TREE_CODE (t) == INIT_EXPR
2675 && TREE_CODE (TREE_OPERAND (t, 1)) != TARGET_EXPR)
2677 TREE_OPERAND (t, 1) = stabilize_expr (TREE_OPERAND (t, 1), initp);
2681 if (TREE_CODE (t) == INIT_EXPR)
2682 t = TREE_OPERAND (t, 1);
2683 if (TREE_CODE (t) == TARGET_EXPR)
2684 t = TARGET_EXPR_INITIAL (t);
2685 if (TREE_CODE (t) == COMPOUND_EXPR)
2687 if (TREE_CODE (t) == CONSTRUCTOR
2688 && EMPTY_CONSTRUCTOR_P (t))
2689 /* Default-initialization. */
2692 /* If the initializer is a COND_EXPR, we can't preevaluate
2694 if (TREE_CODE (t) == COND_EXPR)
2697 if (TREE_CODE (t) == CALL_EXPR)
2699 stabilize_call (t, initp);
2703 if (TREE_CODE (t) == AGGR_INIT_EXPR)
2705 stabilize_aggr_init (t, initp);
2709 /* The initialization is being performed via a bitwise copy -- and
2710 the item copied may have side effects. */
2711 return TREE_SIDE_EFFECTS (init);
2714 /* Like "fold", but should be used whenever we might be processing the
2715 body of a template. */
2718 fold_if_not_in_template (tree expr)
2720 /* In the body of a template, there is never any need to call
2721 "fold". We will call fold later when actually instantiating the
2722 template. Integral constant expressions in templates will be
2723 evaluated via fold_non_dependent_expr, as necessary. */
2724 if (processing_template_decl)
2727 /* Fold C++ front-end specific tree codes. */
2728 if (TREE_CODE (expr) == UNARY_PLUS_EXPR)
2729 return fold_convert (TREE_TYPE (expr), TREE_OPERAND (expr, 0));
2734 /* Returns true if a cast to TYPE may appear in an integral constant
2738 cast_valid_in_integral_constant_expression_p (tree type)
2740 return (INTEGRAL_OR_ENUMERATION_TYPE_P (type)
2741 || dependent_type_p (type)
2742 || type == error_mark_node);
2746 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
2747 /* Complain that some language-specific thing hanging off a tree
2748 node has been accessed improperly. */
2751 lang_check_failed (const char* file, int line, const char* function)
2753 internal_error ("lang_* check: failed in %s, at %s:%d",
2754 function, trim_filename (file), line);
2756 #endif /* ENABLE_TREE_CHECKING */
2758 #include "gt-cp-tree.h"