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 Free Software Foundation, Inc.
4 Hacked by Michael Tiemann (tiemann@cygnus.com)
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GCC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to
20 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
25 #include "coretypes.h"
33 #include "insn-config.h"
34 #include "integrate.h"
35 #include "tree-inline.h"
39 static tree bot_manip (tree *, int *, void *);
40 static tree bot_replace (tree *, int *, void *);
41 static tree build_cplus_array_type_1 (tree, tree);
42 static int list_hash_eq (const void *, const void *);
43 static hashval_t list_hash_pieces (tree, tree, tree);
44 static hashval_t list_hash (const void *);
45 static cp_lvalue_kind lvalue_p_1 (tree, int);
46 static tree build_target_expr (tree, tree);
47 static tree count_trees_r (tree *, int *, void *);
48 static tree verify_stmt_tree_r (tree *, int *, void *);
49 static tree build_local_temp (tree);
51 static tree handle_java_interface_attribute (tree *, tree, tree, int, bool *);
52 static tree handle_com_interface_attribute (tree *, tree, tree, int, bool *);
53 static tree handle_init_priority_attribute (tree *, tree, tree, int, bool *);
55 /* If REF is an lvalue, returns the kind of lvalue that REF is.
56 Otherwise, returns clk_none. If TREAT_CLASS_RVALUES_AS_LVALUES is
57 nonzero, rvalues of class type are considered lvalues. */
61 int treat_class_rvalues_as_lvalues)
63 cp_lvalue_kind op1_lvalue_kind = clk_none;
64 cp_lvalue_kind op2_lvalue_kind = clk_none;
66 if (TREE_CODE (TREE_TYPE (ref)) == REFERENCE_TYPE)
69 if (ref == current_class_ptr)
72 switch (TREE_CODE (ref))
74 /* preincrements and predecrements are valid lvals, provided
75 what they refer to are valid lvals. */
76 case PREINCREMENT_EXPR:
77 case PREDECREMENT_EXPR:
80 case WITH_CLEANUP_EXPR:
83 return lvalue_p_1 (TREE_OPERAND (ref, 0),
84 treat_class_rvalues_as_lvalues);
87 op1_lvalue_kind = lvalue_p_1 (TREE_OPERAND (ref, 0),
88 treat_class_rvalues_as_lvalues);
89 /* Look at the member designator. */
91 /* The "field" can be a FUNCTION_DECL or an OVERLOAD in some
93 || TREE_CODE (TREE_OPERAND (ref, 1)) != FIELD_DECL)
95 else if (DECL_C_BIT_FIELD (TREE_OPERAND (ref, 1)))
97 /* Clear the ordinary bit. If this object was a class
98 rvalue we want to preserve that information. */
99 op1_lvalue_kind &= ~clk_ordinary;
100 /* The lvalue is for a bitfield. */
101 op1_lvalue_kind |= clk_bitfield;
103 else if (DECL_PACKED (TREE_OPERAND (ref, 1)))
104 op1_lvalue_kind |= clk_packed;
106 return op1_lvalue_kind;
113 if (TREE_READONLY (ref) && ! TREE_STATIC (ref)
114 && DECL_LANG_SPECIFIC (ref)
115 && DECL_IN_AGGR_P (ref))
121 if (TREE_CODE (TREE_TYPE (ref)) != METHOD_TYPE)
125 /* A currently unresolved scope ref. */
130 /* Disallow <? and >? as lvalues if either argument side-effects. */
131 if (TREE_SIDE_EFFECTS (TREE_OPERAND (ref, 0))
132 || TREE_SIDE_EFFECTS (TREE_OPERAND (ref, 1)))
134 op1_lvalue_kind = lvalue_p_1 (TREE_OPERAND (ref, 0),
135 treat_class_rvalues_as_lvalues);
136 op2_lvalue_kind = lvalue_p_1 (TREE_OPERAND (ref, 1),
137 treat_class_rvalues_as_lvalues);
141 op1_lvalue_kind = lvalue_p_1 (TREE_OPERAND (ref, 1),
142 treat_class_rvalues_as_lvalues);
143 op2_lvalue_kind = lvalue_p_1 (TREE_OPERAND (ref, 2),
144 treat_class_rvalues_as_lvalues);
151 return lvalue_p_1 (TREE_OPERAND (ref, 1),
152 treat_class_rvalues_as_lvalues);
155 return treat_class_rvalues_as_lvalues ? clk_class : clk_none;
158 return (treat_class_rvalues_as_lvalues
159 && CLASS_TYPE_P (TREE_TYPE (ref))
160 ? clk_class : clk_none);
163 /* Any class-valued call would be wrapped in a TARGET_EXPR. */
167 /* All functions (except non-static-member functions) are
169 return (DECL_NONSTATIC_MEMBER_FUNCTION_P (ref)
170 ? clk_none : clk_ordinary);
172 case NON_DEPENDENT_EXPR:
173 /* We must consider NON_DEPENDENT_EXPRs to be lvalues so that
174 things like "&E" where "E" is an expression with a
175 non-dependent type work. It is safe to be lenient because an
176 error will be issued when the template is instantiated if "E"
184 /* If one operand is not an lvalue at all, then this expression is
186 if (!op1_lvalue_kind || !op2_lvalue_kind)
189 /* Otherwise, it's an lvalue, and it has all the odd properties
190 contributed by either operand. */
191 op1_lvalue_kind = op1_lvalue_kind | op2_lvalue_kind;
192 /* It's not an ordinary lvalue if it involves either a bit-field or
194 if ((op1_lvalue_kind & ~clk_ordinary) != clk_none)
195 op1_lvalue_kind &= ~clk_ordinary;
196 return op1_lvalue_kind;
199 /* Returns the kind of lvalue that REF is, in the sense of
200 [basic.lval]. This function should really be named lvalue_p; it
201 computes the C++ definition of lvalue. */
204 real_lvalue_p (tree ref)
206 return lvalue_p_1 (ref,
207 /*treat_class_rvalues_as_lvalues=*/0);
210 /* This differs from real_lvalue_p in that class rvalues are
211 considered lvalues. */
217 (lvalue_p_1 (ref, /*class rvalue ok*/ 1) != clk_none);
220 /* Test whether DECL is a builtin that may appear in a
221 constant-expression. */
224 builtin_valid_in_constant_expr_p (tree decl)
226 /* At present BUILT_IN_CONSTANT_P is the only builtin we're allowing
227 in constant-expressions. We may want to add other builtins later. */
228 return DECL_IS_BUILTIN_CONSTANT_P (decl);
231 /* Build a TARGET_EXPR, initializing the DECL with the VALUE. */
234 build_target_expr (tree decl, tree value)
238 t = build4 (TARGET_EXPR, TREE_TYPE (decl), decl, value,
239 cxx_maybe_build_cleanup (decl), NULL_TREE);
240 /* We always set TREE_SIDE_EFFECTS so that expand_expr does not
241 ignore the TARGET_EXPR. If there really turn out to be no
242 side-effects, then the optimizer should be able to get rid of
243 whatever code is generated anyhow. */
244 TREE_SIDE_EFFECTS (t) = 1;
249 /* Return an undeclared local temporary of type TYPE for use in building a
253 build_local_temp (tree type)
255 tree slot = build_decl (VAR_DECL, NULL_TREE, type);
256 DECL_ARTIFICIAL (slot) = 1;
257 DECL_IGNORED_P (slot) = 1;
258 DECL_CONTEXT (slot) = current_function_decl;
259 layout_decl (slot, 0);
263 /* INIT is a CALL_EXPR which needs info about its target.
264 TYPE is the type that this initialization should appear to have.
266 Build an encapsulation of the initialization to perform
267 and return it so that it can be processed by language-independent
268 and language-specific expression expanders. */
271 build_cplus_new (tree type, tree init)
278 /* Make sure that we're not trying to create an instance of an
280 abstract_virtuals_error (NULL_TREE, type);
282 if (TREE_CODE (init) != CALL_EXPR && TREE_CODE (init) != AGGR_INIT_EXPR)
283 return convert (type, init);
285 fn = TREE_OPERAND (init, 0);
286 is_ctor = (TREE_CODE (fn) == ADDR_EXPR
287 && TREE_CODE (TREE_OPERAND (fn, 0)) == FUNCTION_DECL
288 && DECL_CONSTRUCTOR_P (TREE_OPERAND (fn, 0)));
290 slot = build_local_temp (type);
292 /* We split the CALL_EXPR into its function and its arguments here.
293 Then, in expand_expr, we put them back together. The reason for
294 this is that this expression might be a default argument
295 expression. In that case, we need a new temporary every time the
296 expression is used. That's what break_out_target_exprs does; it
297 replaces every AGGR_INIT_EXPR with a copy that uses a fresh
298 temporary slot. Then, expand_expr builds up a call-expression
299 using the new slot. */
301 /* If we don't need to use a constructor to create an object of this
302 type, don't mess with AGGR_INIT_EXPR. */
303 if (is_ctor || TREE_ADDRESSABLE (type))
305 rval = build3 (AGGR_INIT_EXPR, void_type_node, fn,
306 TREE_OPERAND (init, 1), slot);
307 TREE_SIDE_EFFECTS (rval) = 1;
308 AGGR_INIT_VIA_CTOR_P (rval) = is_ctor;
313 rval = build_target_expr (slot, rval);
318 /* Build a TARGET_EXPR using INIT to initialize a new temporary of the
322 build_target_expr_with_type (tree init, tree type)
324 gcc_assert (!VOID_TYPE_P (type));
326 if (TREE_CODE (init) == TARGET_EXPR)
328 else if (CLASS_TYPE_P (type) && !TYPE_HAS_TRIVIAL_INIT_REF (type)
329 && TREE_CODE (init) != COND_EXPR
330 && TREE_CODE (init) != CONSTRUCTOR
331 && TREE_CODE (init) != VA_ARG_EXPR)
332 /* We need to build up a copy constructor call. COND_EXPR is a special
333 case because we already have copies on the arms and we don't want
334 another one here. A CONSTRUCTOR is aggregate initialization, which
335 is handled separately. A VA_ARG_EXPR is magic creation of an
336 aggregate; there's no additional work to be done. */
337 return force_rvalue (init);
339 return force_target_expr (type, init);
342 /* Like the above function, but without the checking. This function should
343 only be used by code which is deliberately trying to subvert the type
344 system, such as call_builtin_trap. */
347 force_target_expr (tree type, tree init)
351 gcc_assert (!VOID_TYPE_P (type));
353 slot = build_local_temp (type);
354 return build_target_expr (slot, init);
357 /* Like build_target_expr_with_type, but use the type of INIT. */
360 get_target_expr (tree init)
362 return build_target_expr_with_type (init, TREE_TYPE (init));
365 /* EXPR is being used in an rvalue context. Return a version of EXPR
366 that is marked as an rvalue. */
372 if (real_lvalue_p (expr))
374 type = TREE_TYPE (expr);
377 Non-class rvalues always have cv-unqualified types. */
378 if (!CLASS_TYPE_P (type))
379 type = TYPE_MAIN_VARIANT (type);
380 expr = build1 (NON_LVALUE_EXPR, type, expr);
387 build_cplus_array_type_1 (tree elt_type, tree index_type)
391 if (elt_type == error_mark_node || index_type == error_mark_node)
392 return error_mark_node;
394 if (dependent_type_p (elt_type)
396 && value_dependent_expression_p (TYPE_MAX_VALUE (index_type))))
398 t = make_node (ARRAY_TYPE);
399 TREE_TYPE (t) = elt_type;
400 TYPE_DOMAIN (t) = index_type;
403 t = build_array_type (elt_type, index_type);
405 /* Push these needs up so that initialization takes place
407 TYPE_NEEDS_CONSTRUCTING (t)
408 = TYPE_NEEDS_CONSTRUCTING (TYPE_MAIN_VARIANT (elt_type));
409 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
410 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TYPE_MAIN_VARIANT (elt_type));
415 build_cplus_array_type (tree elt_type, tree index_type)
418 int type_quals = cp_type_quals (elt_type);
420 if (type_quals != TYPE_UNQUALIFIED)
421 elt_type = cp_build_qualified_type (elt_type, TYPE_UNQUALIFIED);
423 t = build_cplus_array_type_1 (elt_type, index_type);
425 if (type_quals != TYPE_UNQUALIFIED)
426 t = cp_build_qualified_type (t, type_quals);
431 /* Make a variant of TYPE, qualified with the TYPE_QUALS. Handles
432 arrays correctly. In particular, if TYPE is an array of T's, and
433 TYPE_QUALS is non-empty, returns an array of qualified T's.
435 FLAGS determines how to deal with illformed qualifications. If
436 tf_ignore_bad_quals is set, then bad qualifications are dropped
437 (this is permitted if TYPE was introduced via a typedef or template
438 type parameter). If bad qualifications are dropped and tf_warning
439 is set, then a warning is issued for non-const qualifications. If
440 tf_ignore_bad_quals is not set and tf_error is not set, we
441 return error_mark_node. Otherwise, we issue an error, and ignore
444 Qualification of a reference type is valid when the reference came
445 via a typedef or template type argument. [dcl.ref] No such
446 dispensation is provided for qualifying a function type. [dcl.fct]
447 DR 295 queries this and the proposed resolution brings it into line
448 with qualifying a reference. We implement the DR. We also behave
449 in a similar manner for restricting non-pointer types. */
452 cp_build_qualified_type_real (tree type,
454 tsubst_flags_t complain)
457 int bad_quals = TYPE_UNQUALIFIED;
459 if (type == error_mark_node)
462 if (type_quals == cp_type_quals (type))
465 if (TREE_CODE (type) == ARRAY_TYPE)
467 /* In C++, the qualification really applies to the array element
468 type. Obtain the appropriately qualified element type. */
471 = cp_build_qualified_type_real (TREE_TYPE (type),
475 if (element_type == error_mark_node)
476 return error_mark_node;
478 /* See if we already have an identically qualified type. */
479 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
480 if (cp_type_quals (t) == type_quals
481 && TYPE_NAME (t) == TYPE_NAME (type)
482 && TYPE_CONTEXT (t) == TYPE_CONTEXT (type))
487 /* Make a new array type, just like the old one, but with the
488 appropriately qualified element type. */
489 t = build_variant_type_copy (type);
490 TREE_TYPE (t) = element_type;
493 /* Even if we already had this variant, we update
494 TYPE_NEEDS_CONSTRUCTING and TYPE_HAS_NONTRIVIAL_DESTRUCTOR in case
495 they changed since the variant was originally created.
497 This seems hokey; if there is some way to use a previous
498 variant *without* coming through here,
499 TYPE_NEEDS_CONSTRUCTING will never be updated. */
500 TYPE_NEEDS_CONSTRUCTING (t)
501 = TYPE_NEEDS_CONSTRUCTING (TYPE_MAIN_VARIANT (element_type));
502 TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
503 = TYPE_HAS_NONTRIVIAL_DESTRUCTOR (TYPE_MAIN_VARIANT (element_type));
506 else if (TYPE_PTRMEMFUNC_P (type))
508 /* For a pointer-to-member type, we can't just return a
509 cv-qualified version of the RECORD_TYPE. If we do, we
510 haven't changed the field that contains the actual pointer to
511 a method, and so TYPE_PTRMEMFUNC_FN_TYPE will be wrong. */
514 t = TYPE_PTRMEMFUNC_FN_TYPE (type);
515 t = cp_build_qualified_type_real (t, type_quals, complain);
516 return build_ptrmemfunc_type (t);
519 /* A reference or method type shall not be cv qualified.
520 [dcl.ref], [dct.fct] */
521 if (type_quals & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE)
522 && (TREE_CODE (type) == REFERENCE_TYPE
523 || TREE_CODE (type) == METHOD_TYPE))
525 bad_quals |= type_quals & (TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE);
526 type_quals &= ~(TYPE_QUAL_CONST | TYPE_QUAL_VOLATILE);
529 /* A restrict-qualified type must be a pointer (or reference)
530 to object or incomplete type, or a function type. */
531 if ((type_quals & TYPE_QUAL_RESTRICT)
532 && TREE_CODE (type) != TEMPLATE_TYPE_PARM
533 && TREE_CODE (type) != TYPENAME_TYPE
534 && TREE_CODE (type) != FUNCTION_TYPE
535 && !POINTER_TYPE_P (type))
537 bad_quals |= TYPE_QUAL_RESTRICT;
538 type_quals &= ~TYPE_QUAL_RESTRICT;
541 if (bad_quals == TYPE_UNQUALIFIED)
543 else if (!(complain & (tf_error | tf_ignore_bad_quals)))
544 return error_mark_node;
547 if (complain & tf_ignore_bad_quals)
548 /* We're not going to warn about constifying things that can't
550 bad_quals &= ~TYPE_QUAL_CONST;
553 tree bad_type = build_qualified_type (ptr_type_node, bad_quals);
555 if (!(complain & tf_ignore_bad_quals))
556 error ("%qV qualifiers cannot be applied to %qT",
561 /* Retrieve (or create) the appropriately qualified variant. */
562 result = build_qualified_type (type, type_quals);
564 /* If this was a pointer-to-method type, and we just made a copy,
565 then we need to unshare the record that holds the cached
566 pointer-to-member-function type, because these will be distinct
567 between the unqualified and qualified types. */
569 && TREE_CODE (type) == POINTER_TYPE
570 && TREE_CODE (TREE_TYPE (type)) == METHOD_TYPE)
571 TYPE_LANG_SPECIFIC (result) = NULL;
576 /* Returns the canonical version of TYPE. In other words, if TYPE is
577 a typedef, returns the underlying type. The cv-qualification of
578 the type returned matches the type input; they will always be
582 canonical_type_variant (tree t)
584 return cp_build_qualified_type (TYPE_MAIN_VARIANT (t), cp_type_quals (t));
587 /* Makes a copy of BINFO and TYPE, which is to be inherited into a
588 graph dominated by T. If BINFO is NULL, TYPE is a dependent base,
589 and we do a shallow copy. If BINFO is non-NULL, we do a deep copy.
590 VIRT indicates whether TYPE is inherited virtually or not.
591 IGO_PREV points at the previous binfo of the inheritance graph
592 order chain. The newly copied binfo's TREE_CHAIN forms this
595 The CLASSTYPE_VBASECLASSES vector of T is constructed in the
596 correct order. That is in the order the bases themselves should be
599 The BINFO_INHERITANCE of a virtual base class points to the binfo
600 of the most derived type. ??? We could probably change this so that
601 BINFO_INHERITANCE becomes synonymous with BINFO_PRIMARY, and hence
602 remove a field. They currently can only differ for primary virtual
606 copy_binfo (tree binfo, tree type, tree t, tree *igo_prev, int virt)
612 /* See if we've already made this virtual base. */
613 new_binfo = binfo_for_vbase (type, t);
618 new_binfo = make_tree_binfo (binfo ? BINFO_N_BASE_BINFOS (binfo) : 0);
619 BINFO_TYPE (new_binfo) = type;
621 /* Chain it into the inheritance graph. */
622 TREE_CHAIN (*igo_prev) = new_binfo;
623 *igo_prev = new_binfo;
630 gcc_assert (!BINFO_DEPENDENT_BASE_P (binfo));
631 gcc_assert (SAME_BINFO_TYPE_P (BINFO_TYPE (binfo), type));
633 BINFO_OFFSET (new_binfo) = BINFO_OFFSET (binfo);
634 BINFO_VIRTUALS (new_binfo) = BINFO_VIRTUALS (binfo);
636 /* We do not need to copy the accesses, as they are read only. */
637 BINFO_BASE_ACCESSES (new_binfo) = BINFO_BASE_ACCESSES (binfo);
639 /* Recursively copy base binfos of BINFO. */
640 for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++)
644 gcc_assert (!BINFO_DEPENDENT_BASE_P (base_binfo));
645 new_base_binfo = copy_binfo (base_binfo, BINFO_TYPE (base_binfo),
647 BINFO_VIRTUAL_P (base_binfo));
649 if (!BINFO_INHERITANCE_CHAIN (new_base_binfo))
650 BINFO_INHERITANCE_CHAIN (new_base_binfo) = new_binfo;
651 BINFO_BASE_APPEND (new_binfo, new_base_binfo);
655 BINFO_DEPENDENT_BASE_P (new_binfo) = 1;
659 /* Push it onto the list after any virtual bases it contains
660 will have been pushed. */
661 VEC_quick_push (tree, CLASSTYPE_VBASECLASSES (t), new_binfo);
662 BINFO_VIRTUAL_P (new_binfo) = 1;
663 BINFO_INHERITANCE_CHAIN (new_binfo) = TYPE_BINFO (t);
669 /* Hashing of lists so that we don't make duplicates.
670 The entry point is `list_hash_canon'. */
672 /* Now here is the hash table. When recording a list, it is added
673 to the slot whose index is the hash code mod the table size.
674 Note that the hash table is used for several kinds of lists.
675 While all these live in the same table, they are completely independent,
676 and the hash code is computed differently for each of these. */
678 static GTY ((param_is (union tree_node))) htab_t list_hash_table;
687 /* Compare ENTRY (an entry in the hash table) with DATA (a list_proxy
688 for a node we are thinking about adding). */
691 list_hash_eq (const void* entry, const void* data)
693 tree t = (tree) entry;
694 struct list_proxy *proxy = (struct list_proxy *) data;
696 return (TREE_VALUE (t) == proxy->value
697 && TREE_PURPOSE (t) == proxy->purpose
698 && TREE_CHAIN (t) == proxy->chain);
701 /* Compute a hash code for a list (chain of TREE_LIST nodes
702 with goodies in the TREE_PURPOSE, TREE_VALUE, and bits of the
703 TREE_COMMON slots), by adding the hash codes of the individual entries. */
706 list_hash_pieces (tree purpose, tree value, tree chain)
708 hashval_t hashcode = 0;
711 hashcode += TREE_HASH (chain);
714 hashcode += TREE_HASH (value);
718 hashcode += TREE_HASH (purpose);
724 /* Hash an already existing TREE_LIST. */
727 list_hash (const void* p)
730 return list_hash_pieces (TREE_PURPOSE (t),
735 /* Given list components PURPOSE, VALUE, AND CHAIN, return the canonical
736 object for an identical list if one already exists. Otherwise, build a
737 new one, and record it as the canonical object. */
740 hash_tree_cons (tree purpose, tree value, tree chain)
744 struct list_proxy proxy;
746 /* Hash the list node. */
747 hashcode = list_hash_pieces (purpose, value, chain);
748 /* Create a proxy for the TREE_LIST we would like to create. We
749 don't actually create it so as to avoid creating garbage. */
750 proxy.purpose = purpose;
753 /* See if it is already in the table. */
754 slot = htab_find_slot_with_hash (list_hash_table, &proxy, hashcode,
756 /* If not, create a new node. */
758 *slot = tree_cons (purpose, value, chain);
762 /* Constructor for hashed lists. */
765 hash_tree_chain (tree value, tree chain)
767 return hash_tree_cons (NULL_TREE, value, chain);
771 debug_binfo (tree elem)
776 fprintf (stderr, "type \"%s\", offset = " HOST_WIDE_INT_PRINT_DEC
778 TYPE_NAME_STRING (BINFO_TYPE (elem)),
779 TREE_INT_CST_LOW (BINFO_OFFSET (elem)));
780 debug_tree (BINFO_TYPE (elem));
781 if (BINFO_VTABLE (elem))
782 fprintf (stderr, "vtable decl \"%s\"\n",
783 IDENTIFIER_POINTER (DECL_NAME (get_vtbl_decl_for_binfo (elem))));
785 fprintf (stderr, "no vtable decl yet\n");
786 fprintf (stderr, "virtuals:\n");
787 virtuals = BINFO_VIRTUALS (elem);
792 tree fndecl = TREE_VALUE (virtuals);
793 fprintf (stderr, "%s [%ld =? %ld]\n",
794 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)),
795 (long) n, (long) TREE_INT_CST_LOW (DECL_VINDEX (fndecl)));
797 virtuals = TREE_CHAIN (virtuals);
801 /* Build a representation for the qualified name SCOPE::NAME. TYPE is
802 the type of the result expression, if known, or NULL_TREE if the
803 resulting expression is type-dependent. If TEMPLATE_P is true,
804 NAME is known to be a template because the user explicitly used the
805 "template" keyword after the "::".
807 All SCOPE_REFs should be built by use of this function. */
810 build_qualified_name (tree type, tree scope, tree name, bool template_p)
813 if (type == error_mark_node
814 || scope == error_mark_node
815 || name == error_mark_node)
816 return error_mark_node;
817 t = build2 (SCOPE_REF, type, scope, name);
818 QUALIFIED_NAME_IS_TEMPLATE (t) = template_p;
823 is_overloaded_fn (tree x)
825 /* A baselink is also considered an overloaded function. */
826 if (TREE_CODE (x) == OFFSET_REF)
827 x = TREE_OPERAND (x, 1);
829 x = BASELINK_FUNCTIONS (x);
830 return (TREE_CODE (x) == FUNCTION_DECL
831 || TREE_CODE (x) == TEMPLATE_ID_EXPR
832 || DECL_FUNCTION_TEMPLATE_P (x)
833 || TREE_CODE (x) == OVERLOAD);
837 really_overloaded_fn (tree x)
839 if (TREE_CODE (x) == OFFSET_REF)
840 x = TREE_OPERAND (x, 1);
841 /* A baselink is also considered an overloaded function. */
843 x = BASELINK_FUNCTIONS (x);
845 return ((TREE_CODE (x) == OVERLOAD && OVL_CHAIN (x))
846 || DECL_FUNCTION_TEMPLATE_P (OVL_CURRENT (x))
847 || TREE_CODE (x) == TEMPLATE_ID_EXPR);
851 get_first_fn (tree from)
853 gcc_assert (is_overloaded_fn (from));
854 /* A baselink is also considered an overloaded function. */
855 if (BASELINK_P (from))
856 from = BASELINK_FUNCTIONS (from);
857 return OVL_CURRENT (from);
860 /* Return a new OVL node, concatenating it with the old one. */
863 ovl_cons (tree decl, tree chain)
865 tree result = make_node (OVERLOAD);
866 TREE_TYPE (result) = unknown_type_node;
867 OVL_FUNCTION (result) = decl;
868 TREE_CHAIN (result) = chain;
873 /* Build a new overloaded function. If this is the first one,
874 just return it; otherwise, ovl_cons the _DECLs */
877 build_overload (tree decl, tree chain)
879 if (! chain && TREE_CODE (decl) != TEMPLATE_DECL)
881 if (chain && TREE_CODE (chain) != OVERLOAD)
882 chain = ovl_cons (chain, NULL_TREE);
883 return ovl_cons (decl, chain);
887 #define PRINT_RING_SIZE 4
890 cxx_printable_name (tree decl, int v)
892 static tree decl_ring[PRINT_RING_SIZE];
893 static char *print_ring[PRINT_RING_SIZE];
894 static int ring_counter;
897 /* Only cache functions. */
899 || TREE_CODE (decl) != FUNCTION_DECL
900 || DECL_LANG_SPECIFIC (decl) == 0)
901 return lang_decl_name (decl, v);
903 /* See if this print name is lying around. */
904 for (i = 0; i < PRINT_RING_SIZE; i++)
905 if (decl_ring[i] == decl)
906 /* yes, so return it. */
907 return print_ring[i];
909 if (++ring_counter == PRINT_RING_SIZE)
912 if (current_function_decl != NULL_TREE)
914 if (decl_ring[ring_counter] == current_function_decl)
916 if (ring_counter == PRINT_RING_SIZE)
918 gcc_assert (decl_ring[ring_counter] != current_function_decl);
921 if (print_ring[ring_counter])
922 free (print_ring[ring_counter]);
924 print_ring[ring_counter] = xstrdup (lang_decl_name (decl, v));
925 decl_ring[ring_counter] = decl;
926 return print_ring[ring_counter];
929 /* Build the FUNCTION_TYPE or METHOD_TYPE which may throw exceptions
933 build_exception_variant (tree type, tree raises)
935 tree v = TYPE_MAIN_VARIANT (type);
936 int type_quals = TYPE_QUALS (type);
938 for (; v; v = TYPE_NEXT_VARIANT (v))
939 if (check_qualified_type (v, type, type_quals)
940 && comp_except_specs (raises, TYPE_RAISES_EXCEPTIONS (v), 1))
943 /* Need to build a new variant. */
944 v = build_variant_type_copy (type);
945 TYPE_RAISES_EXCEPTIONS (v) = raises;
949 /* Given a TEMPLATE_TEMPLATE_PARM node T, create a new
950 BOUND_TEMPLATE_TEMPLATE_PARM bound with NEWARGS as its template
954 bind_template_template_parm (tree t, tree newargs)
956 tree decl = TYPE_NAME (t);
959 t2 = make_aggr_type (BOUND_TEMPLATE_TEMPLATE_PARM);
960 decl = build_decl (TYPE_DECL, DECL_NAME (decl), NULL_TREE);
962 /* These nodes have to be created to reflect new TYPE_DECL and template
964 TEMPLATE_TYPE_PARM_INDEX (t2) = copy_node (TEMPLATE_TYPE_PARM_INDEX (t));
965 TEMPLATE_PARM_DECL (TEMPLATE_TYPE_PARM_INDEX (t2)) = decl;
966 TEMPLATE_TEMPLATE_PARM_TEMPLATE_INFO (t2)
967 = tree_cons (TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL (t),
970 TREE_TYPE (decl) = t2;
971 TYPE_NAME (t2) = decl;
972 TYPE_STUB_DECL (t2) = decl;
978 /* Called from count_trees via walk_tree. */
981 count_trees_r (tree *tp, int *walk_subtrees, void *data)
991 /* Debugging function for measuring the rough complexity of a tree
998 walk_tree_without_duplicates (&t, count_trees_r, &n_trees);
1002 /* Called from verify_stmt_tree via walk_tree. */
1005 verify_stmt_tree_r (tree* tp,
1006 int* walk_subtrees ATTRIBUTE_UNUSED ,
1010 htab_t *statements = (htab_t *) data;
1013 if (!STATEMENT_CODE_P (TREE_CODE (t)))
1016 /* If this statement is already present in the hash table, then
1017 there is a circularity in the statement tree. */
1018 gcc_assert (!htab_find (*statements, t));
1020 slot = htab_find_slot (*statements, t, INSERT);
1026 /* Debugging function to check that the statement T has not been
1027 corrupted. For now, this function simply checks that T contains no
1031 verify_stmt_tree (tree t)
1034 statements = htab_create (37, htab_hash_pointer, htab_eq_pointer, NULL);
1035 walk_tree (&t, verify_stmt_tree_r, &statements, NULL);
1036 htab_delete (statements);
1039 /* Check if the type T depends on a type with no linkage and if so, return
1040 it. If RELAXED_P then do not consider a class type declared within
1041 a TREE_PUBLIC function to have no linkage. */
1044 no_linkage_check (tree t, bool relaxed_p)
1048 /* There's no point in checking linkage on template functions; we
1049 can't know their complete types. */
1050 if (processing_template_decl)
1053 switch (TREE_CODE (t))
1058 if (TYPE_PTRMEMFUNC_P (t))
1062 if (!CLASS_TYPE_P (t))
1066 if (TYPE_ANONYMOUS_P (t))
1068 fn = decl_function_context (TYPE_MAIN_DECL (t));
1069 if (fn && (!relaxed_p || !TREE_PUBLIC (fn)))
1075 case REFERENCE_TYPE:
1076 return no_linkage_check (TREE_TYPE (t), relaxed_p);
1080 r = no_linkage_check (TYPE_PTRMEM_POINTED_TO_TYPE (t),
1084 return no_linkage_check (TYPE_PTRMEM_CLASS_TYPE (t), relaxed_p);
1087 r = no_linkage_check (TYPE_METHOD_BASETYPE (t), relaxed_p);
1094 for (parm = TYPE_ARG_TYPES (t);
1095 parm && parm != void_list_node;
1096 parm = TREE_CHAIN (parm))
1098 r = no_linkage_check (TREE_VALUE (parm), relaxed_p);
1102 return no_linkage_check (TREE_TYPE (t), relaxed_p);
1110 #ifdef GATHER_STATISTICS
1111 extern int depth_reached;
1115 cxx_print_statistics (void)
1117 print_search_statistics ();
1118 print_class_statistics ();
1119 #ifdef GATHER_STATISTICS
1120 fprintf (stderr, "maximum template instantiation depth reached: %d\n",
1125 /* Return, as an INTEGER_CST node, the number of elements for TYPE
1126 (which is an ARRAY_TYPE). This counts only elements of the top
1130 array_type_nelts_top (tree type)
1132 return fold_build2 (PLUS_EXPR, sizetype,
1133 array_type_nelts (type),
1137 /* Return, as an INTEGER_CST node, the number of elements for TYPE
1138 (which is an ARRAY_TYPE). This one is a recursive count of all
1139 ARRAY_TYPEs that are clumped together. */
1142 array_type_nelts_total (tree type)
1144 tree sz = array_type_nelts_top (type);
1145 type = TREE_TYPE (type);
1146 while (TREE_CODE (type) == ARRAY_TYPE)
1148 tree n = array_type_nelts_top (type);
1149 sz = fold_build2 (MULT_EXPR, sizetype, sz, n);
1150 type = TREE_TYPE (type);
1155 /* Called from break_out_target_exprs via mapcar. */
1158 bot_manip (tree* tp, int* walk_subtrees, void* data)
1160 splay_tree target_remap = ((splay_tree) data);
1163 if (!TYPE_P (t) && TREE_CONSTANT (t))
1165 /* There can't be any TARGET_EXPRs or their slot variables below
1166 this point. We used to check !TREE_SIDE_EFFECTS, but then we
1167 failed to copy an ADDR_EXPR of the slot VAR_DECL. */
1171 if (TREE_CODE (t) == TARGET_EXPR)
1175 if (TREE_CODE (TREE_OPERAND (t, 1)) == AGGR_INIT_EXPR)
1177 (TREE_TYPE (t), break_out_target_exprs (TREE_OPERAND (t, 1)));
1179 u = build_target_expr_with_type
1180 (break_out_target_exprs (TREE_OPERAND (t, 1)), TREE_TYPE (t));
1182 /* Map the old variable to the new one. */
1183 splay_tree_insert (target_remap,
1184 (splay_tree_key) TREE_OPERAND (t, 0),
1185 (splay_tree_value) TREE_OPERAND (u, 0));
1187 /* Replace the old expression with the new version. */
1189 /* We don't have to go below this point; the recursive call to
1190 break_out_target_exprs will have handled anything below this
1196 /* Make a copy of this node. */
1197 return copy_tree_r (tp, walk_subtrees, NULL);
1200 /* Replace all remapped VAR_DECLs in T with their new equivalents.
1201 DATA is really a splay-tree mapping old variables to new
1205 bot_replace (tree* t,
1206 int* walk_subtrees ATTRIBUTE_UNUSED ,
1209 splay_tree target_remap = ((splay_tree) data);
1211 if (TREE_CODE (*t) == VAR_DECL)
1213 splay_tree_node n = splay_tree_lookup (target_remap,
1214 (splay_tree_key) *t);
1216 *t = (tree) n->value;
1222 /* When we parse a default argument expression, we may create
1223 temporary variables via TARGET_EXPRs. When we actually use the
1224 default-argument expression, we make a copy of the expression, but
1225 we must replace the temporaries with appropriate local versions. */
1228 break_out_target_exprs (tree t)
1230 static int target_remap_count;
1231 static splay_tree target_remap;
1233 if (!target_remap_count++)
1234 target_remap = splay_tree_new (splay_tree_compare_pointers,
1235 /*splay_tree_delete_key_fn=*/NULL,
1236 /*splay_tree_delete_value_fn=*/NULL);
1237 walk_tree (&t, bot_manip, target_remap, NULL);
1238 walk_tree (&t, bot_replace, target_remap, NULL);
1240 if (!--target_remap_count)
1242 splay_tree_delete (target_remap);
1243 target_remap = NULL;
1249 /* Similar to `build_nt', but for template definitions of dependent
1253 build_min_nt (enum tree_code code, ...)
1262 t = make_node (code);
1263 length = TREE_CODE_LENGTH (code);
1265 for (i = 0; i < length; i++)
1267 tree x = va_arg (p, tree);
1268 TREE_OPERAND (t, i) = x;
1275 /* Similar to `build', but for template definitions. */
1278 build_min (enum tree_code code, tree tt, ...)
1287 t = make_node (code);
1288 length = TREE_CODE_LENGTH (code);
1291 for (i = 0; i < length; i++)
1293 tree x = va_arg (p, tree);
1294 TREE_OPERAND (t, i) = x;
1295 if (x && !TYPE_P (x) && TREE_SIDE_EFFECTS (x))
1296 TREE_SIDE_EFFECTS (t) = 1;
1303 /* Similar to `build', but for template definitions of non-dependent
1304 expressions. NON_DEP is the non-dependent expression that has been
1308 build_min_non_dep (enum tree_code code, tree non_dep, ...)
1315 va_start (p, non_dep);
1317 t = make_node (code);
1318 length = TREE_CODE_LENGTH (code);
1319 TREE_TYPE (t) = TREE_TYPE (non_dep);
1320 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (non_dep);
1322 for (i = 0; i < length; i++)
1324 tree x = va_arg (p, tree);
1325 TREE_OPERAND (t, i) = x;
1328 if (code == COMPOUND_EXPR && TREE_CODE (non_dep) != COMPOUND_EXPR)
1329 /* This should not be considered a COMPOUND_EXPR, because it
1330 resolves to an overload. */
1331 COMPOUND_EXPR_OVERLOADED (t) = 1;
1338 get_type_decl (tree t)
1340 if (TREE_CODE (t) == TYPE_DECL)
1343 return TYPE_STUB_DECL (t);
1344 gcc_assert (t == error_mark_node);
1348 /* Returns the namespace that contains DECL, whether directly or
1352 decl_namespace_context (tree decl)
1356 if (TREE_CODE (decl) == NAMESPACE_DECL)
1358 else if (TYPE_P (decl))
1359 decl = CP_DECL_CONTEXT (TYPE_MAIN_DECL (decl));
1361 decl = CP_DECL_CONTEXT (decl);
1365 /* Return truthvalue of whether T1 is the same tree structure as T2.
1366 Return 1 if they are the same. Return 0 if they are different. */
1369 cp_tree_equal (tree t1, tree t2)
1371 enum tree_code code1, code2;
1378 for (code1 = TREE_CODE (t1);
1379 code1 == NOP_EXPR || code1 == CONVERT_EXPR
1380 || code1 == NON_LVALUE_EXPR;
1381 code1 = TREE_CODE (t1))
1382 t1 = TREE_OPERAND (t1, 0);
1383 for (code2 = TREE_CODE (t2);
1384 code2 == NOP_EXPR || code2 == CONVERT_EXPR
1385 || code1 == NON_LVALUE_EXPR;
1386 code2 = TREE_CODE (t2))
1387 t2 = TREE_OPERAND (t2, 0);
1389 /* They might have become equal now. */
1399 return TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
1400 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2);
1403 return REAL_VALUES_EQUAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
1406 return TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
1407 && !memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
1408 TREE_STRING_LENGTH (t1));
1411 /* We need to do this when determining whether or not two
1412 non-type pointer to member function template arguments
1414 if (!(same_type_p (TREE_TYPE (t1), TREE_TYPE (t2))
1415 /* The first operand is RTL. */
1416 && TREE_OPERAND (t1, 0) == TREE_OPERAND (t2, 0)))
1418 return cp_tree_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
1421 if (!cp_tree_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2)))
1423 if (!cp_tree_equal (TREE_VALUE (t1), TREE_VALUE (t2)))
1425 return cp_tree_equal (TREE_CHAIN (t1), TREE_CHAIN (t2));
1428 return cp_tree_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
1431 if (!cp_tree_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)))
1433 return cp_tree_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
1437 tree o1 = TREE_OPERAND (t1, 0);
1438 tree o2 = TREE_OPERAND (t2, 0);
1440 /* Special case: if either target is an unallocated VAR_DECL,
1441 it means that it's going to be unified with whatever the
1442 TARGET_EXPR is really supposed to initialize, so treat it
1443 as being equivalent to anything. */
1444 if (TREE_CODE (o1) == VAR_DECL && DECL_NAME (o1) == NULL_TREE
1445 && !DECL_RTL_SET_P (o1))
1447 else if (TREE_CODE (o2) == VAR_DECL && DECL_NAME (o2) == NULL_TREE
1448 && !DECL_RTL_SET_P (o2))
1450 else if (!cp_tree_equal (o1, o2))
1453 return cp_tree_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
1456 case WITH_CLEANUP_EXPR:
1457 if (!cp_tree_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)))
1459 return cp_tree_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t1, 1));
1462 if (TREE_OPERAND (t1, 1) != TREE_OPERAND (t2, 1))
1464 return cp_tree_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
1471 case IDENTIFIER_NODE:
1476 return (BASELINK_BINFO (t1) == BASELINK_BINFO (t2)
1477 && BASELINK_ACCESS_BINFO (t1) == BASELINK_ACCESS_BINFO (t2)
1478 && cp_tree_equal (BASELINK_FUNCTIONS (t1),
1479 BASELINK_FUNCTIONS (t2)));
1481 case TEMPLATE_PARM_INDEX:
1482 return (TEMPLATE_PARM_IDX (t1) == TEMPLATE_PARM_IDX (t2)
1483 && TEMPLATE_PARM_LEVEL (t1) == TEMPLATE_PARM_LEVEL (t2)
1484 && same_type_p (TREE_TYPE (TEMPLATE_PARM_DECL (t1)),
1485 TREE_TYPE (TEMPLATE_PARM_DECL (t2))));
1487 case TEMPLATE_ID_EXPR:
1492 if (!cp_tree_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0)))
1494 vec1 = TREE_OPERAND (t1, 1);
1495 vec2 = TREE_OPERAND (t2, 1);
1498 return !vec1 && !vec2;
1500 if (TREE_VEC_LENGTH (vec1) != TREE_VEC_LENGTH (vec2))
1503 for (ix = TREE_VEC_LENGTH (vec1); ix--;)
1504 if (!cp_tree_equal (TREE_VEC_ELT (vec1, ix),
1505 TREE_VEC_ELT (vec2, ix)))
1514 tree o1 = TREE_OPERAND (t1, 0);
1515 tree o2 = TREE_OPERAND (t2, 0);
1517 if (TREE_CODE (o1) != TREE_CODE (o2))
1520 return same_type_p (o1, o2);
1522 return cp_tree_equal (o1, o2);
1526 /* Two pointer-to-members are the same if they point to the same
1527 field or function in the same class. */
1528 if (PTRMEM_CST_MEMBER (t1) != PTRMEM_CST_MEMBER (t2))
1531 return same_type_p (PTRMEM_CST_CLASS (t1), PTRMEM_CST_CLASS (t2));
1534 if (OVL_FUNCTION (t1) != OVL_FUNCTION (t2))
1536 return cp_tree_equal (OVL_CHAIN (t1), OVL_CHAIN (t2));
1542 switch (TREE_CODE_CLASS (code1))
1546 case tcc_comparison:
1547 case tcc_expression:
1553 for (i = 0; i < TREE_CODE_LENGTH (code1); ++i)
1554 if (!cp_tree_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i)))
1561 return same_type_p (t1, t2);
1565 /* We can get here with --disable-checking. */
1569 /* The type of ARG when used as an lvalue. */
1572 lvalue_type (tree arg)
1574 tree type = TREE_TYPE (arg);
1578 /* The type of ARG for printing error messages; denote lvalues with
1582 error_type (tree arg)
1584 tree type = TREE_TYPE (arg);
1586 if (TREE_CODE (type) == ARRAY_TYPE)
1588 else if (TREE_CODE (type) == ERROR_MARK)
1590 else if (real_lvalue_p (arg))
1591 type = build_reference_type (lvalue_type (arg));
1592 else if (IS_AGGR_TYPE (type))
1593 type = lvalue_type (arg);
1598 /* Does FUNCTION use a variable-length argument list? */
1601 varargs_function_p (tree function)
1603 tree parm = TYPE_ARG_TYPES (TREE_TYPE (function));
1604 for (; parm; parm = TREE_CHAIN (parm))
1605 if (TREE_VALUE (parm) == void_type_node)
1610 /* Returns 1 if decl is a member of a class. */
1613 member_p (tree decl)
1615 const tree ctx = DECL_CONTEXT (decl);
1616 return (ctx && TYPE_P (ctx));
1619 /* Create a placeholder for member access where we don't actually have an
1620 object that the access is against. */
1623 build_dummy_object (tree type)
1625 tree decl = build1 (NOP_EXPR, build_pointer_type (type), void_zero_node);
1626 return build_indirect_ref (decl, NULL);
1629 /* We've gotten a reference to a member of TYPE. Return *this if appropriate,
1630 or a dummy object otherwise. If BINFOP is non-0, it is filled with the
1631 binfo path from current_class_type to TYPE, or 0. */
1634 maybe_dummy_object (tree type, tree* binfop)
1639 if (current_class_type
1640 && (binfo = lookup_base (current_class_type, type,
1641 ba_unique | ba_quiet, NULL)))
1642 context = current_class_type;
1645 /* Reference from a nested class member function. */
1647 binfo = TYPE_BINFO (type);
1653 if (current_class_ref && context == current_class_type
1654 /* Kludge: Make sure that current_class_type is actually
1655 correct. It might not be if we're in the middle of
1656 tsubst_default_argument. */
1657 && same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (current_class_ref)),
1658 current_class_type))
1659 decl = current_class_ref;
1661 decl = build_dummy_object (context);
1666 /* Returns 1 if OB is a placeholder object, or a pointer to one. */
1669 is_dummy_object (tree ob)
1671 if (TREE_CODE (ob) == INDIRECT_REF)
1672 ob = TREE_OPERAND (ob, 0);
1673 return (TREE_CODE (ob) == NOP_EXPR
1674 && TREE_OPERAND (ob, 0) == void_zero_node);
1677 /* Returns 1 iff type T is a POD type, as defined in [basic.types]. */
1682 t = strip_array_types (t);
1684 if (t == error_mark_node)
1686 if (INTEGRAL_TYPE_P (t))
1687 return 1; /* integral, character or enumeral type */
1688 if (FLOAT_TYPE_P (t))
1691 return 1; /* pointer to non-member */
1692 if (TYPE_PTR_TO_MEMBER_P (t))
1693 return 1; /* pointer to member */
1695 if (TREE_CODE (t) == VECTOR_TYPE)
1696 return 1; /* vectors are (small) arrays of scalars */
1698 if (! CLASS_TYPE_P (t))
1699 return 0; /* other non-class type (reference or function) */
1700 if (CLASSTYPE_NON_POD_P (t))
1705 /* Returns 1 iff zero initialization of type T means actually storing
1709 zero_init_p (tree t)
1711 t = strip_array_types (t);
1713 if (t == error_mark_node)
1716 /* NULL pointers to data members are initialized with -1. */
1717 if (TYPE_PTRMEM_P (t))
1720 /* Classes that contain types that can't be zero-initialized, cannot
1721 be zero-initialized themselves. */
1722 if (CLASS_TYPE_P (t) && CLASSTYPE_NON_ZERO_INIT_P (t))
1728 /* Table of valid C++ attributes. */
1729 const struct attribute_spec cxx_attribute_table[] =
1731 /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */
1732 { "java_interface", 0, 0, false, false, false, handle_java_interface_attribute },
1733 { "com_interface", 0, 0, false, false, false, handle_com_interface_attribute },
1734 { "init_priority", 1, 1, true, false, false, handle_init_priority_attribute },
1735 { NULL, 0, 0, false, false, false, NULL }
1738 /* Handle a "java_interface" attribute; arguments as in
1739 struct attribute_spec.handler. */
1741 handle_java_interface_attribute (tree* node,
1743 tree args ATTRIBUTE_UNUSED ,
1748 || !CLASS_TYPE_P (*node)
1749 || !TYPE_FOR_JAVA (*node))
1751 error ("%qE attribute can only be applied to Java class definitions",
1753 *no_add_attrs = true;
1756 if (!(flags & (int) ATTR_FLAG_TYPE_IN_PLACE))
1757 *node = build_variant_type_copy (*node);
1758 TYPE_JAVA_INTERFACE (*node) = 1;
1763 /* Handle a "com_interface" attribute; arguments as in
1764 struct attribute_spec.handler. */
1766 handle_com_interface_attribute (tree* node,
1768 tree args ATTRIBUTE_UNUSED ,
1769 int flags ATTRIBUTE_UNUSED ,
1774 *no_add_attrs = true;
1777 || !CLASS_TYPE_P (*node)
1778 || *node != TYPE_MAIN_VARIANT (*node))
1780 warning (OPT_Wattributes, "%qE attribute can only be applied "
1781 "to class definitions", name);
1786 warning (0, "%qE is obsolete; g++ vtables are now COM-compatible by default",
1792 /* Handle an "init_priority" attribute; arguments as in
1793 struct attribute_spec.handler. */
1795 handle_init_priority_attribute (tree* node,
1798 int flags ATTRIBUTE_UNUSED ,
1801 tree initp_expr = TREE_VALUE (args);
1803 tree type = TREE_TYPE (decl);
1806 STRIP_NOPS (initp_expr);
1808 if (!initp_expr || TREE_CODE (initp_expr) != INTEGER_CST)
1810 error ("requested init_priority is not an integer constant");
1811 *no_add_attrs = true;
1815 pri = TREE_INT_CST_LOW (initp_expr);
1817 type = strip_array_types (type);
1819 if (decl == NULL_TREE
1820 || TREE_CODE (decl) != VAR_DECL
1821 || !TREE_STATIC (decl)
1822 || DECL_EXTERNAL (decl)
1823 || (TREE_CODE (type) != RECORD_TYPE
1824 && TREE_CODE (type) != UNION_TYPE)
1825 /* Static objects in functions are initialized the
1826 first time control passes through that
1827 function. This is not precise enough to pin down an
1828 init_priority value, so don't allow it. */
1829 || current_function_decl)
1831 error ("can only use %qE attribute on file-scope definitions "
1832 "of objects of class type", name);
1833 *no_add_attrs = true;
1837 if (pri > MAX_INIT_PRIORITY || pri <= 0)
1839 error ("requested init_priority is out of range");
1840 *no_add_attrs = true;
1844 /* Check for init_priorities that are reserved for
1845 language and runtime support implementations.*/
1846 if (pri <= MAX_RESERVED_INIT_PRIORITY)
1849 (0, "requested init_priority is reserved for internal use");
1852 if (SUPPORTS_INIT_PRIORITY)
1854 SET_DECL_INIT_PRIORITY (decl, pri);
1855 DECL_HAS_INIT_PRIORITY_P (decl) = 1;
1860 error ("%qE attribute is not supported on this platform", name);
1861 *no_add_attrs = true;
1866 /* Return a new PTRMEM_CST of the indicated TYPE. The MEMBER is the
1867 thing pointed to by the constant. */
1870 make_ptrmem_cst (tree type, tree member)
1872 tree ptrmem_cst = make_node (PTRMEM_CST);
1873 TREE_TYPE (ptrmem_cst) = type;
1874 PTRMEM_CST_MEMBER (ptrmem_cst) = member;
1878 /* Build a variant of TYPE that has the indicated ATTRIBUTES. May
1879 return an existing type of an appropriate type already exists. */
1882 cp_build_type_attribute_variant (tree type, tree attributes)
1886 new_type = build_type_attribute_variant (type, attributes);
1887 if (TREE_CODE (new_type) == FUNCTION_TYPE
1888 && (TYPE_RAISES_EXCEPTIONS (new_type)
1889 != TYPE_RAISES_EXCEPTIONS (type)))
1890 new_type = build_exception_variant (new_type,
1891 TYPE_RAISES_EXCEPTIONS (type));
1895 /* Apply FUNC to all language-specific sub-trees of TP in a pre-order
1896 traversal. Called from walk_tree. */
1899 cp_walk_subtrees (tree *tp, int *walk_subtrees_p, walk_tree_fn func,
1900 void *data, struct pointer_set_t *pset)
1902 enum tree_code code = TREE_CODE (*tp);
1903 location_t save_locus;
1906 #define WALK_SUBTREE(NODE) \
1909 result = walk_tree (&(NODE), func, data, pset); \
1910 if (result) goto out; \
1914 /* Set input_location here so we get the right instantiation context
1915 if we call instantiate_decl from inlinable_function_p. */
1916 save_locus = input_location;
1917 if (EXPR_HAS_LOCATION (*tp))
1918 input_location = EXPR_LOCATION (*tp);
1920 /* Not one of the easy cases. We must explicitly go through the
1926 case TEMPLATE_TEMPLATE_PARM:
1927 case BOUND_TEMPLATE_TEMPLATE_PARM:
1928 case UNBOUND_CLASS_TEMPLATE:
1929 case TEMPLATE_PARM_INDEX:
1930 case TEMPLATE_TYPE_PARM:
1934 /* None of these have subtrees other than those already walked
1936 *walk_subtrees_p = 0;
1940 WALK_SUBTREE (TINST_DECL (*tp));
1941 *walk_subtrees_p = 0;
1945 WALK_SUBTREE (TREE_TYPE (*tp));
1946 *walk_subtrees_p = 0;
1950 WALK_SUBTREE (TREE_PURPOSE (*tp));
1954 WALK_SUBTREE (OVL_FUNCTION (*tp));
1955 WALK_SUBTREE (OVL_CHAIN (*tp));
1956 *walk_subtrees_p = 0;
1960 if (TYPE_PTRMEMFUNC_P (*tp))
1961 WALK_SUBTREE (TYPE_PTRMEMFUNC_FN_TYPE (*tp));
1965 input_location = save_locus;
1969 /* We didn't find what we were looking for. */
1971 input_location = save_locus;
1977 /* Decide whether there are language-specific reasons to not inline a
1978 function as a tree. */
1981 cp_cannot_inline_tree_fn (tree* fnp)
1985 /* We can inline a template instantiation only if it's fully
1987 if (DECL_TEMPLATE_INFO (fn)
1988 && TI_PENDING_TEMPLATE_FLAG (DECL_TEMPLATE_INFO (fn)))
1990 /* Don't instantiate functions that are not going to be
1992 if (!DECL_INLINE (DECL_TEMPLATE_RESULT
1993 (template_for_substitution (fn))))
1996 fn = *fnp = instantiate_decl (fn, /*defer_ok=*/0, /*undefined_ok=*/0);
1998 if (TI_PENDING_TEMPLATE_FLAG (DECL_TEMPLATE_INFO (fn)))
2002 if (flag_really_no_inline
2003 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)) == NULL)
2006 /* Don't auto-inline anything that might not be bound within
2007 this unit of translation.
2008 Exclude comdat functions from this rule. While they can be bound
2009 to the other unit, they all must be the same. This is especially
2010 important so templates can inline. */
2011 if (!DECL_DECLARED_INLINE_P (fn) && !(*targetm.binds_local_p) (fn)
2012 && !DECL_COMDAT (fn))
2014 DECL_UNINLINABLE (fn) = 1;
2018 if (varargs_function_p (fn))
2020 DECL_UNINLINABLE (fn) = 1;
2024 if (! function_attribute_inlinable_p (fn))
2026 DECL_UNINLINABLE (fn) = 1;
2033 /* Add any pending functions other than the current function (already
2034 handled by the caller), that thus cannot be inlined, to FNS_P, then
2035 return the latest function added to the array, PREV_FN. */
2038 cp_add_pending_fn_decls (void* fns_p, tree prev_fn)
2040 varray_type *fnsp = (varray_type *)fns_p;
2041 struct saved_scope *s;
2043 for (s = scope_chain; s; s = s->prev)
2044 if (s->function_decl && s->function_decl != prev_fn)
2046 VARRAY_PUSH_TREE (*fnsp, s->function_decl);
2047 prev_fn = s->function_decl;
2053 /* Determine whether VAR is a declaration of an automatic variable in
2057 cp_auto_var_in_fn_p (tree var, tree fn)
2059 return (DECL_P (var) && DECL_CONTEXT (var) == fn
2060 && nonstatic_local_decl_p (var));
2063 /* Initialize tree.c. */
2068 list_hash_table = htab_create_ggc (31, list_hash, list_hash_eq, NULL);
2071 /* Returns the kind of special function that DECL (a FUNCTION_DECL)
2072 is. Note that sfk_none is zero, so this function can be used as a
2073 predicate to test whether or not DECL is a special function. */
2075 special_function_kind
2076 special_function_p (tree decl)
2078 /* Rather than doing all this stuff with magic names, we should
2079 probably have a field of type `special_function_kind' in
2080 DECL_LANG_SPECIFIC. */
2081 if (DECL_COPY_CONSTRUCTOR_P (decl))
2082 return sfk_copy_constructor;
2083 if (DECL_CONSTRUCTOR_P (decl))
2084 return sfk_constructor;
2085 if (DECL_OVERLOADED_OPERATOR_P (decl) == NOP_EXPR)
2086 return sfk_assignment_operator;
2087 if (DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
2088 return sfk_destructor;
2089 if (DECL_COMPLETE_DESTRUCTOR_P (decl))
2090 return sfk_complete_destructor;
2091 if (DECL_BASE_DESTRUCTOR_P (decl))
2092 return sfk_base_destructor;
2093 if (DECL_DELETING_DESTRUCTOR_P (decl))
2094 return sfk_deleting_destructor;
2095 if (DECL_CONV_FN_P (decl))
2096 return sfk_conversion;
2101 /* Returns nonzero if TYPE is a character type, including wchar_t. */
2104 char_type_p (tree type)
2106 return (same_type_p (type, char_type_node)
2107 || same_type_p (type, unsigned_char_type_node)
2108 || same_type_p (type, signed_char_type_node)
2109 || same_type_p (type, wchar_type_node));
2112 /* Returns the kind of linkage associated with the indicated DECL. Th
2113 value returned is as specified by the language standard; it is
2114 independent of implementation details regarding template
2115 instantiation, etc. For example, it is possible that a declaration
2116 to which this function assigns external linkage would not show up
2117 as a global symbol when you run `nm' on the resulting object file. */
2120 decl_linkage (tree decl)
2122 /* This function doesn't attempt to calculate the linkage from first
2123 principles as given in [basic.link]. Instead, it makes use of
2124 the fact that we have already set TREE_PUBLIC appropriately, and
2125 then handles a few special cases. Ideally, we would calculate
2126 linkage first, and then transform that into a concrete
2129 /* Things that don't have names have no linkage. */
2130 if (!DECL_NAME (decl))
2133 /* Things that are TREE_PUBLIC have external linkage. */
2134 if (TREE_PUBLIC (decl))
2137 /* Linkage of a CONST_DECL depends on the linkage of the enumeration
2139 if (TREE_CODE (decl) == CONST_DECL)
2140 return decl_linkage (TYPE_NAME (TREE_TYPE (decl)));
2142 /* Some things that are not TREE_PUBLIC have external linkage, too.
2143 For example, on targets that don't have weak symbols, we make all
2144 template instantiations have internal linkage (in the object
2145 file), but the symbols should still be treated as having external
2146 linkage from the point of view of the language. */
2147 if (TREE_CODE (decl) != TYPE_DECL && DECL_LANG_SPECIFIC (decl) && DECL_COMDAT (decl))
2150 /* Things in local scope do not have linkage, if they don't have
2152 if (decl_function_context (decl))
2155 /* Everything else has internal linkage. */
2159 /* EXP is an expression that we want to pre-evaluate. Returns via INITP an
2160 expression to perform the pre-evaluation, and returns directly an
2161 expression to use the precalculated result. */
2164 stabilize_expr (tree exp, tree* initp)
2168 if (!TREE_SIDE_EFFECTS (exp))
2170 init_expr = NULL_TREE;
2172 else if (!real_lvalue_p (exp)
2173 || !TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (exp)))
2175 init_expr = get_target_expr (exp);
2176 exp = TARGET_EXPR_SLOT (init_expr);
2180 exp = build_unary_op (ADDR_EXPR, exp, 1);
2181 init_expr = get_target_expr (exp);
2182 exp = TARGET_EXPR_SLOT (init_expr);
2183 exp = build_indirect_ref (exp, 0);
2190 /* Add NEW, an expression whose value we don't care about, after the
2191 similar expression ORIG. */
2194 add_stmt_to_compound (tree orig, tree new)
2196 if (!new || !TREE_SIDE_EFFECTS (new))
2198 if (!orig || !TREE_SIDE_EFFECTS (orig))
2200 return build2 (COMPOUND_EXPR, void_type_node, orig, new);
2203 /* Like stabilize_expr, but for a call whose args we want to
2207 stabilize_call (tree call, tree *initp)
2209 tree inits = NULL_TREE;
2212 if (call == error_mark_node)
2215 gcc_assert (TREE_CODE (call) == CALL_EXPR
2216 || TREE_CODE (call) == AGGR_INIT_EXPR);
2218 for (t = TREE_OPERAND (call, 1); t; t = TREE_CHAIN (t))
2219 if (TREE_SIDE_EFFECTS (TREE_VALUE (t)))
2222 TREE_VALUE (t) = stabilize_expr (TREE_VALUE (t), &init);
2223 inits = add_stmt_to_compound (inits, init);
2229 /* Like stabilize_expr, but for an initialization. If we are initializing
2230 an object of class type, we don't want to introduce an extra temporary,
2231 so we look past the TARGET_EXPR and stabilize the arguments of the call
2235 stabilize_init (tree init, tree *initp)
2239 if (t == error_mark_node)
2242 if (TREE_CODE (t) == INIT_EXPR
2243 && TREE_CODE (TREE_OPERAND (t, 1)) != TARGET_EXPR)
2244 TREE_OPERAND (t, 1) = stabilize_expr (TREE_OPERAND (t, 1), initp);
2247 if (TREE_CODE (t) == INIT_EXPR)
2248 t = TREE_OPERAND (t, 1);
2249 if (TREE_CODE (t) == TARGET_EXPR)
2250 t = TARGET_EXPR_INITIAL (t);
2251 if (TREE_CODE (t) == COMPOUND_EXPR)
2253 if (TREE_CODE (t) == CONSTRUCTOR
2254 && EMPTY_CONSTRUCTOR_P (t))
2256 /* Default-initialization. */
2261 /* If the initializer is a COND_EXPR, we can't preevaluate
2263 if (TREE_CODE (t) == COND_EXPR)
2266 /* The TARGET_EXPR might be initializing via bitwise copy from
2267 another variable; leave that alone. */
2268 if (TREE_SIDE_EFFECTS (t))
2269 stabilize_call (t, initp);
2275 /* Like "fold", but should be used whenever we might be processing the
2276 body of a template. */
2279 fold_if_not_in_template (tree expr)
2281 /* In the body of a template, there is never any need to call
2282 "fold". We will call fold later when actually instantiating the
2283 template. Integral constant expressions in templates will be
2284 evaluated via fold_non_dependent_expr, as necessary. */
2285 if (processing_template_decl)
2288 /* Fold C++ front-end specific tree codes. */
2289 if (TREE_CODE (expr) == UNARY_PLUS_EXPR)
2290 return fold_convert (TREE_TYPE (expr), TREE_OPERAND (expr, 0));
2296 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
2297 /* Complain that some language-specific thing hanging off a tree
2298 node has been accessed improperly. */
2301 lang_check_failed (const char* file, int line, const char* function)
2303 internal_error ("lang_* check: failed in %s, at %s:%d",
2304 function, trim_filename (file), line);
2306 #endif /* ENABLE_TREE_CHECKING */
2308 #include "gt-cp-tree.h"