1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 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. */
24 /* Process declarations and symbol lookup for C++ front end.
25 Also constructs types; the standard scalar types at initialization,
26 and structure, union, array and enum types when they are declared. */
28 /* ??? not all decl nodes are given the most useful possible
29 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "coretypes.h"
48 #include "tree-mudflap.h"
50 #include "tree-inline.h"
52 #include "tree-dump.h"
55 extern cpp_reader *parse_in;
57 /* This structure contains information about the initializations
58 and/or destructions required for a particular priority level. */
59 typedef struct priority_info_s {
60 /* Nonzero if there have been any initializations at this priority
61 throughout the translation unit. */
62 int initializations_p;
63 /* Nonzero if there have been any destructions at this priority
64 throughout the translation unit. */
68 static void mark_vtable_entries (tree);
69 static bool maybe_emit_vtables (tree);
70 static bool acceptable_java_type (tree);
71 static tree start_objects (int, int);
72 static void finish_objects (int, int, tree);
73 static tree start_static_storage_duration_function (unsigned);
74 static void finish_static_storage_duration_function (tree);
75 static priority_info get_priority_info (int);
76 static void do_static_initialization_or_destruction (tree, bool);
77 static void one_static_initialization_or_destruction (tree, tree, bool);
78 static void generate_ctor_or_dtor_function (bool, int, location_t *);
79 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
81 static tree prune_vars_needing_no_initialization (tree *);
82 static void write_out_vars (tree);
83 static void import_export_class (tree);
84 static tree get_guard_bits (tree);
85 static void determine_visibility_from_class (tree, tree);
87 /* A list of static class variables. This is needed, because a
88 static class variable can be declared inside the class without
89 an initializer, and then initialized, statically, outside the class. */
90 static GTY(()) VEC(tree,gc) *pending_statics;
92 /* A list of functions which were declared inline, but which we
93 may need to emit outline anyway. */
94 static GTY(()) VEC(tree,gc) *deferred_fns;
96 /* Nonzero if we're done parsing and into end-of-file activities. */
100 /* Functions called along with real static constructors and destructors. */
107 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
108 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
109 that apply to the function). */
112 build_memfn_type (tree fntype, tree ctype, cp_cv_quals quals)
117 if (fntype == error_mark_node || ctype == error_mark_node)
118 return error_mark_node;
120 type_quals = quals & ~TYPE_QUAL_RESTRICT;
121 ctype = cp_build_qualified_type (ctype, type_quals);
122 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
123 (TREE_CODE (fntype) == METHOD_TYPE
124 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
125 : TYPE_ARG_TYPES (fntype)));
126 raises = TYPE_RAISES_EXCEPTIONS (fntype);
128 fntype = build_exception_variant (fntype, raises);
133 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
137 cp_build_parm_decl (tree name, tree type)
139 tree parm = build_decl (PARM_DECL, name, type);
140 /* DECL_ARG_TYPE is only used by the back end and the back end never
142 if (!processing_template_decl)
143 DECL_ARG_TYPE (parm) = type_passed_as (type);
147 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
151 build_artificial_parm (tree name, tree type)
153 tree parm = cp_build_parm_decl (name, type);
154 DECL_ARTIFICIAL (parm) = 1;
155 /* All our artificial parms are implicitly `const'; they cannot be
157 TREE_READONLY (parm) = 1;
161 /* Constructors for types with virtual baseclasses need an "in-charge" flag
162 saying whether this constructor is responsible for initialization of
163 virtual baseclasses or not. All destructors also need this "in-charge"
164 flag, which additionally determines whether or not the destructor should
165 free the memory for the object.
167 This function adds the "in-charge" flag to member function FN if
168 appropriate. It is called from grokclassfn and tsubst.
169 FN must be either a constructor or destructor.
171 The in-charge flag follows the 'this' parameter, and is followed by the
172 VTT parm (if any), then the user-written parms. */
175 maybe_retrofit_in_chrg (tree fn)
177 tree basetype, arg_types, parms, parm, fntype;
179 /* If we've already add the in-charge parameter don't do it again. */
180 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
183 /* When processing templates we can't know, in general, whether or
184 not we're going to have virtual baseclasses. */
185 if (processing_template_decl)
188 /* We don't need an in-charge parameter for constructors that don't
189 have virtual bases. */
190 if (DECL_CONSTRUCTOR_P (fn)
191 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
194 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
195 basetype = TREE_TYPE (TREE_VALUE (arg_types));
196 arg_types = TREE_CHAIN (arg_types);
198 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
200 /* If this is a subobject constructor or destructor, our caller will
201 pass us a pointer to our VTT. */
202 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn)))
204 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
206 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
207 TREE_CHAIN (parm) = parms;
210 /* ...and then to TYPE_ARG_TYPES. */
211 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
213 DECL_HAS_VTT_PARM_P (fn) = 1;
216 /* Then add the in-charge parm (before the VTT parm). */
217 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
218 TREE_CHAIN (parm) = parms;
220 arg_types = hash_tree_chain (integer_type_node, arg_types);
222 /* Insert our new parameter(s) into the list. */
223 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
225 /* And rebuild the function type. */
226 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
228 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
229 fntype = build_exception_variant (fntype,
230 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
231 TREE_TYPE (fn) = fntype;
233 /* Now we've got the in-charge parameter. */
234 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
237 /* Classes overload their constituent function names automatically.
238 When a function name is declared in a record structure,
239 its name is changed to it overloaded name. Since names for
240 constructors and destructors can conflict, we place a leading
243 CNAME is the name of the class we are grokking for.
245 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
247 FLAGS contains bits saying what's special about today's
248 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
250 If FUNCTION is a destructor, then we must add the `auto-delete' field
251 as a second parameter. There is some hair associated with the fact
252 that we must "declare" this variable in the manner consistent with the
253 way the rest of the arguments were declared.
255 QUALS are the qualifiers for the this pointer. */
258 grokclassfn (tree ctype, tree function, enum overload_flags flags)
260 tree fn_name = DECL_NAME (function);
262 /* Even within an `extern "C"' block, members get C++ linkage. See
263 [dcl.link] for details. */
264 SET_DECL_LANGUAGE (function, lang_cplusplus);
266 if (fn_name == NULL_TREE)
268 error ("name missing for member function");
269 fn_name = get_identifier ("<anonymous>");
270 DECL_NAME (function) = fn_name;
273 DECL_CONTEXT (function) = ctype;
275 if (flags == DTOR_FLAG)
276 DECL_DESTRUCTOR_P (function) = 1;
278 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
279 maybe_retrofit_in_chrg (function);
282 /* Create an ARRAY_REF, checking for the user doing things backwards
286 grok_array_decl (tree array_expr, tree index_exp)
290 tree orig_array_expr = array_expr;
291 tree orig_index_exp = index_exp;
293 if (error_operand_p (array_expr) || error_operand_p (index_exp))
294 return error_mark_node;
296 if (processing_template_decl)
298 if (type_dependent_expression_p (array_expr)
299 || type_dependent_expression_p (index_exp))
300 return build_min_nt (ARRAY_REF, array_expr, index_exp,
301 NULL_TREE, NULL_TREE);
302 array_expr = build_non_dependent_expr (array_expr);
303 index_exp = build_non_dependent_expr (index_exp);
306 type = TREE_TYPE (array_expr);
308 type = non_reference (type);
310 /* If they have an `operator[]', use that. */
311 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
312 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
313 array_expr, index_exp, NULL_TREE,
314 /*overloaded_p=*/NULL);
319 /* Otherwise, create an ARRAY_REF for a pointer or array type.
320 It is a little-known fact that, if `a' is an array and `i' is
321 an int, you can write `i[a]', which means the same thing as
323 if (TREE_CODE (type) == ARRAY_TYPE)
326 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
328 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
331 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
333 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
335 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
338 if ((p1 && i2) && (i1 && p2))
339 error ("ambiguous conversion for array subscript");
342 array_expr = p1, index_exp = i2;
344 array_expr = p2, index_exp = i1;
347 error ("invalid types %<%T[%T]%> for array subscript",
348 type, TREE_TYPE (index_exp));
349 return error_mark_node;
352 if (array_expr == error_mark_node || index_exp == error_mark_node)
353 error ("ambiguous conversion for array subscript");
355 expr = build_array_ref (array_expr, index_exp);
357 if (processing_template_decl && expr != error_mark_node)
358 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
359 NULL_TREE, NULL_TREE);
363 /* Given the cast expression EXP, checking out its validity. Either return
364 an error_mark_node if there was an unavoidable error, return a cast to
365 void for trying to delete a pointer w/ the value 0, or return the
366 call to delete. If DOING_VEC is true, we handle things differently
367 for doing an array delete.
368 Implements ARM $5.3.4. This is called from the parser. */
371 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
375 if (exp == error_mark_node)
378 if (processing_template_decl)
380 t = build_min (DELETE_EXPR, void_type_node, exp, size);
381 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
382 DELETE_EXPR_USE_VEC (t) = doing_vec;
383 TREE_SIDE_EFFECTS (t) = 1;
387 /* An array can't have been allocated by new, so complain. */
388 if (TREE_CODE (exp) == VAR_DECL
389 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
390 warning (0, "deleting array %q#D", exp);
392 t = build_expr_type_conversion (WANT_POINTER, exp, true);
394 if (t == NULL_TREE || t == error_mark_node)
396 error ("type %q#T argument given to %<delete%>, expected pointer",
398 return error_mark_node;
401 type = TREE_TYPE (t);
403 /* As of Valley Forge, you can delete a pointer to const. */
405 /* You can't delete functions. */
406 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
408 error ("cannot delete a function. Only pointer-to-objects are "
409 "valid arguments to %<delete%>");
410 return error_mark_node;
413 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
414 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
416 warning (0, "deleting %qT is undefined", type);
420 /* Deleting a pointer with the value zero is valid and has no effect. */
421 if (integer_zerop (t))
422 return build1 (NOP_EXPR, void_type_node, t);
425 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
426 sfk_deleting_destructor,
429 return build_delete (type, t, sfk_deleting_destructor,
430 LOOKUP_NORMAL, use_global_delete);
433 /* Report an error if the indicated template declaration is not the
434 sort of thing that should be a member template. */
437 check_member_template (tree tmpl)
441 gcc_assert (TREE_CODE (tmpl) == TEMPLATE_DECL);
442 decl = DECL_TEMPLATE_RESULT (tmpl);
444 if (TREE_CODE (decl) == FUNCTION_DECL
445 || (TREE_CODE (decl) == TYPE_DECL
446 && IS_AGGR_TYPE (TREE_TYPE (decl))))
448 if (current_function_decl)
449 /* 14.5.2.2 [temp.mem]
451 A local class shall not have member templates. */
452 error ("invalid declaration of member template %q#D in local class",
455 /* The parser rejects any use of virtual in a function template. */
456 gcc_assert (!(TREE_CODE (decl) == FUNCTION_DECL
457 && DECL_VIRTUAL_P (decl)));
459 /* The debug-information generating code doesn't know what to do
460 with member templates. */
461 DECL_IGNORED_P (tmpl) = 1;
464 error ("template declaration of %q#D", decl);
467 /* Return true iff TYPE is a valid Java parameter or return type. */
470 acceptable_java_type (tree type)
472 if (type == error_mark_node)
475 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
477 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
479 type = TREE_TYPE (type);
480 if (TREE_CODE (type) == RECORD_TYPE)
483 if (! TYPE_FOR_JAVA (type))
485 if (! CLASSTYPE_TEMPLATE_INFO (type))
487 args = CLASSTYPE_TI_ARGS (type);
488 i = TREE_VEC_LENGTH (args);
491 type = TREE_VEC_ELT (args, i);
492 if (TREE_CODE (type) == POINTER_TYPE)
493 type = TREE_TYPE (type);
494 if (! TYPE_FOR_JAVA (type))
503 /* For a METHOD in a Java class CTYPE, return true if
504 the parameter and return types are valid Java types.
505 Otherwise, print appropriate error messages, and return false. */
508 check_java_method (tree method)
511 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
512 tree ret_type = TREE_TYPE (TREE_TYPE (method));
514 if (!acceptable_java_type (ret_type))
516 error ("Java method %qD has non-Java return type %qT",
521 arg_types = TREE_CHAIN (arg_types);
522 if (DECL_HAS_IN_CHARGE_PARM_P (method))
523 arg_types = TREE_CHAIN (arg_types);
524 if (DECL_HAS_VTT_PARM_P (method))
525 arg_types = TREE_CHAIN (arg_types);
527 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
529 tree type = TREE_VALUE (arg_types);
530 if (!acceptable_java_type (type))
532 if (type != error_mark_node)
533 error ("Java method %qD has non-Java parameter type %qT",
541 /* Sanity check: report error if this function FUNCTION is not
542 really a member of the class (CTYPE) it is supposed to belong to.
543 TEMPLATE_PARMS is used to specify the template parameters of a member
544 template passed as FUNCTION_DECL. If the member template is passed as a
545 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
546 from the declaration. If the function is not a function template, it
548 It returns the original declaration for the function, or NULL_TREE
549 if no declaration was found (and an error was emitted). */
552 check_classfn (tree ctype, tree function, tree template_parms)
558 if (DECL_USE_TEMPLATE (function)
559 && !(TREE_CODE (function) == TEMPLATE_DECL
560 && DECL_TEMPLATE_SPECIALIZATION (function))
561 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function)))
562 /* Since this is a specialization of a member template,
563 we're not going to find the declaration in the class.
566 struct S { template <typename T> void f(T); };
567 template <> void S::f(int);
569 we're not going to find `S::f(int)', but there's no
570 reason we should, either. We let our callers know we didn't
571 find the method, but we don't complain. */
574 /* Basic sanity check: for a template function, the template parameters
575 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
576 if (TREE_CODE (function) == TEMPLATE_DECL)
578 gcc_assert (!template_parms
579 || comp_template_parms (template_parms,
580 DECL_TEMPLATE_PARMS (function)));
581 template_parms = DECL_TEMPLATE_PARMS (function);
584 /* OK, is this a definition of a member template? */
585 is_template = (template_parms != NULL_TREE);
587 /* We must enter the scope here, because conversion operators are
588 named by target type, and type equivalence relies on typenames
589 resolving within the scope of CTYPE. */
590 pushed_scope = push_scope (ctype);
591 ix = class_method_index_for_fn (complete_type (ctype), function);
594 VEC(tree,gc) *methods = CLASSTYPE_METHOD_VEC (ctype);
595 tree fndecls, fndecl = 0;
597 const char *format = NULL;
599 for (fndecls = VEC_index (tree, methods, ix);
600 fndecls; fndecls = OVL_NEXT (fndecls))
604 fndecl = OVL_CURRENT (fndecls);
605 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
606 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
608 /* We cannot simply call decls_match because this doesn't
609 work for static member functions that are pretending to
610 be methods, and because the name may have been changed by
613 /* Get rid of the this parameter on functions that become
615 if (DECL_STATIC_FUNCTION_P (fndecl)
616 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
617 p1 = TREE_CHAIN (p1);
619 /* A member template definition only matches a member template
621 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
624 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
625 TREE_TYPE (TREE_TYPE (fndecl)))
626 && compparms (p1, p2)
628 || comp_template_parms (template_parms,
629 DECL_TEMPLATE_PARMS (fndecl)))
630 && (DECL_TEMPLATE_SPECIALIZATION (function)
631 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
632 && (!DECL_TEMPLATE_SPECIALIZATION (function)
633 || (DECL_TI_TEMPLATE (function)
634 == DECL_TI_TEMPLATE (fndecl))))
640 pop_scope (pushed_scope);
641 return OVL_CURRENT (fndecls);
644 error ("prototype for %q#D does not match any in class %qT",
646 is_conv_op = DECL_CONV_FN_P (fndecl);
649 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
650 fndecls = VEC_index (tree, methods, ix);
653 fndecl = OVL_CURRENT (fndecls);
654 fndecls = OVL_NEXT (fndecls);
656 if (!fndecls && is_conv_op)
658 if (VEC_length (tree, methods) > (size_t) ++ix)
660 fndecls = VEC_index (tree, methods, ix);
661 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
673 format = N_("candidates are: %+#D");
675 format = N_("candidate is: %+#D");
676 error (format, fndecl);
679 else if (!COMPLETE_TYPE_P (ctype))
680 cxx_incomplete_type_error (function, ctype);
682 error ("no %q#D member function declared in class %qT",
685 /* If we did not find the method in the class, add it to avoid
686 spurious errors (unless the CTYPE is not yet defined, in which
687 case we'll only confuse ourselves when the function is declared
688 properly within the class. */
689 if (COMPLETE_TYPE_P (ctype))
690 add_method (ctype, function, NULL_TREE);
693 pop_scope (pushed_scope);
697 /* DECL is a function with vague linkage. Remember it so that at the
698 end of the translation unit we can decide whether or not to emit
702 note_vague_linkage_fn (tree decl)
704 if (!DECL_DEFERRED_FN (decl))
706 DECL_DEFERRED_FN (decl) = 1;
707 DECL_DEFER_OUTPUT (decl) = 1;
708 VEC_safe_push (tree, gc, deferred_fns, decl);
712 /* We have just processed the DECL, which is a static data member.
713 The other parameters are as for cp_finish_decl. */
716 finish_static_data_member_decl (tree decl,
717 tree init, bool init_const_expr_p,
721 DECL_CONTEXT (decl) = current_class_type;
723 /* We cannot call pushdecl here, because that would fill in the
724 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
725 the right thing, namely, to put this decl out straight away. */
727 if (! processing_template_decl)
728 VEC_safe_push (tree, gc, pending_statics, decl);
730 if (LOCAL_CLASS_P (current_class_type))
731 pedwarn ("local class %q#T shall not have static data member %q#D",
732 current_class_type, decl);
734 /* Static consts need not be initialized in the class definition. */
735 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
737 static int explained = 0;
739 error ("initializer invalid for static member with constructor");
742 error ("(an out of class initialization is required)");
747 /* Force the compiler to know when an uninitialized static const
748 member is being used. */
749 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
750 TREE_USED (decl) = 1;
751 DECL_INITIAL (decl) = init;
752 DECL_IN_AGGR_P (decl) = 1;
754 cp_finish_decl (decl, init, init_const_expr_p, asmspec_tree, flags);
757 /* DECLARATOR and DECLSPECS correspond to a class member. The other
758 parameters are as for cp_finish_decl. Return the DECL for the
759 class member declared. */
762 grokfield (const cp_declarator *declarator,
763 cp_decl_specifier_seq *declspecs,
764 tree init, bool init_const_expr_p,
769 const char *asmspec = 0;
770 int flags = LOOKUP_ONLYCONVERTING;
772 if (!declspecs->any_specifiers_p
773 && declarator->kind == cdk_id
774 && declarator->u.id.qualifying_scope
775 && TYPE_P (declarator->u.id.qualifying_scope)
776 && IS_AGGR_TYPE (declarator->u.id.qualifying_scope)
777 && TREE_CODE (declarator->u.id.unqualified_name) == IDENTIFIER_NODE)
778 /* Access declaration */
779 return do_class_using_decl (declarator->u.id.qualifying_scope,
780 declarator->u.id.unqualified_name);
783 && TREE_CODE (init) == TREE_LIST
784 && TREE_VALUE (init) == error_mark_node
785 && TREE_CHAIN (init) == NULL_TREE)
788 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
789 if (! value || error_operand_p (value))
790 /* friend or constructor went bad. */
791 return error_mark_node;
793 if (TREE_CODE (value) == TYPE_DECL && init)
795 error ("typedef %qD is initialized (use __typeof__ instead)", value);
799 /* Pass friendly classes back. */
800 if (value == void_type_node)
803 /* Pass friend decls back. */
804 if ((TREE_CODE (value) == FUNCTION_DECL
805 || TREE_CODE (value) == TEMPLATE_DECL)
806 && DECL_CONTEXT (value) != current_class_type)
809 if (DECL_NAME (value) != NULL_TREE
810 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
811 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
812 error ("member %qD conflicts with virtual function table field name",
815 /* Stash away type declarations. */
816 if (TREE_CODE (value) == TYPE_DECL)
818 DECL_NONLOCAL (value) = 1;
819 DECL_CONTEXT (value) = current_class_type;
821 if (processing_template_decl)
822 value = push_template_decl (value);
826 /* Avoid storing attributes in template parameters:
827 tsubst is not ready to handle them. */
828 tree type = TREE_TYPE (value);
829 if (TREE_CODE (type) == TEMPLATE_TYPE_PARM
830 || TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM)
831 sorry ("applying attributes to template parameters is not implemented");
833 cplus_decl_attributes (&value, attrlist, 0);
839 if (DECL_IN_AGGR_P (value))
841 error ("%qD is already defined in %qT", value, DECL_CONTEXT (value));
842 return void_type_node;
845 if (asmspec_tree && asmspec_tree != error_mark_node)
846 asmspec = TREE_STRING_POINTER (asmspec_tree);
850 if (TREE_CODE (value) == FUNCTION_DECL)
852 /* Initializers for functions are rejected early in the parser.
853 If we get here, it must be a pure specifier for a method. */
854 if (TREE_CODE (TREE_TYPE (value)) == METHOD_TYPE)
856 gcc_assert (error_operand_p (init) || integer_zerop (init));
857 DECL_PURE_VIRTUAL_P (value) = 1;
861 gcc_assert (TREE_CODE (TREE_TYPE (value)) == FUNCTION_TYPE);
862 error ("initializer specified for static member function %qD",
866 else if (pedantic && TREE_CODE (value) != VAR_DECL)
867 /* Already complained in grokdeclarator. */
869 else if (!processing_template_decl)
871 if (TREE_CODE (init) == CONSTRUCTOR)
872 init = digest_init (TREE_TYPE (value), init);
874 init = integral_constant_value (init);
876 if (init != error_mark_node && !TREE_CONSTANT (init))
878 /* We can allow references to things that are effectively
879 static, since references are initialized with the
881 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
882 || (TREE_STATIC (init) == 0
883 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
885 error ("field initializer is not constant");
886 init = error_mark_node;
892 if (processing_template_decl
893 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
895 value = push_template_decl (value);
896 if (error_operand_p (value))
897 return error_mark_node;
901 cplus_decl_attributes (&value, attrlist, 0);
903 switch (TREE_CODE (value))
906 finish_static_data_member_decl (value, init, init_const_expr_p,
907 asmspec_tree, flags);
912 error ("%<asm%> specifiers are not permitted on non-static data members");
913 if (DECL_INITIAL (value) == error_mark_node)
914 init = error_mark_node;
915 cp_finish_decl (value, init, /*init_const_expr_p=*/false,
917 DECL_INITIAL (value) = init;
918 DECL_IN_AGGR_P (value) = 1;
923 set_user_assembler_name (value, asmspec);
925 cp_finish_decl (value,
927 /*init_const_expr_p=*/false,
928 asmspec_tree, flags);
930 /* Pass friends back this way. */
931 if (DECL_FRIEND_P (value))
932 return void_type_node;
934 DECL_IN_AGGR_P (value) = 1;
943 /* Like `grokfield', but for bitfields.
944 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
947 grokbitfield (const cp_declarator *declarator,
948 cp_decl_specifier_seq *declspecs, tree width)
950 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
952 if (value == error_mark_node)
953 return NULL_TREE; /* friends went bad. */
955 /* Pass friendly classes back. */
956 if (TREE_CODE (value) == VOID_TYPE)
957 return void_type_node;
959 if (TREE_CODE (value) == TYPE_DECL)
961 error ("cannot declare %qD to be a bit-field type", value);
965 /* Usually, finish_struct_1 catches bitfields with invalid types.
966 But, in the case of bitfields with function type, we confuse
967 ourselves into thinking they are member functions, so we must
969 if (TREE_CODE (value) == FUNCTION_DECL)
971 error ("cannot declare bit-field %qD with function type",
976 if (DECL_IN_AGGR_P (value))
978 error ("%qD is already defined in the class %qT", value,
979 DECL_CONTEXT (value));
980 return void_type_node;
983 if (TREE_STATIC (value))
985 error ("static member %qD cannot be a bit-field", value);
988 finish_decl (value, NULL_TREE, NULL_TREE);
990 if (width != error_mark_node)
992 constant_expression_warning (width);
993 DECL_INITIAL (value) = width;
994 SET_DECL_C_BIT_FIELD (value);
997 DECL_IN_AGGR_P (value) = 1;
1003 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1005 if (*decl == NULL_TREE || *decl == void_type_node
1006 || *decl == error_mark_node)
1009 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1010 decl = &DECL_TEMPLATE_RESULT (*decl);
1012 decl_attributes (decl, attributes, flags);
1014 if (TREE_CODE (*decl) == TYPE_DECL)
1015 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1018 /* Walks through the namespace- or function-scope anonymous union
1019 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1020 Returns one of the fields for use in the mangled name. */
1023 build_anon_union_vars (tree type, tree object)
1025 tree main_decl = NULL_TREE;
1028 /* Rather than write the code to handle the non-union case,
1029 just give an error. */
1030 if (TREE_CODE (type) != UNION_TYPE)
1031 error ("anonymous struct not inside named type");
1033 for (field = TYPE_FIELDS (type);
1035 field = TREE_CHAIN (field))
1040 if (DECL_ARTIFICIAL (field))
1042 if (TREE_CODE (field) != FIELD_DECL)
1044 pedwarn ("%q+#D invalid; an anonymous union can only "
1045 "have non-static data members", field);
1049 if (TREE_PRIVATE (field))
1050 pedwarn ("private member %q+#D in anonymous union", field);
1051 else if (TREE_PROTECTED (field))
1052 pedwarn ("protected member %q+#D in anonymous union", field);
1054 if (processing_template_decl)
1055 ref = build_min_nt (COMPONENT_REF, object,
1056 DECL_NAME (field), NULL_TREE);
1058 ref = build_class_member_access_expr (object, field, NULL_TREE,
1061 if (DECL_NAME (field))
1065 decl = build_decl (VAR_DECL, DECL_NAME (field), TREE_TYPE (field));
1067 base = get_base_address (object);
1068 TREE_PUBLIC (decl) = TREE_PUBLIC (base);
1069 TREE_STATIC (decl) = TREE_STATIC (base);
1070 DECL_EXTERNAL (decl) = DECL_EXTERNAL (base);
1072 SET_DECL_VALUE_EXPR (decl, ref);
1073 DECL_HAS_VALUE_EXPR_P (decl) = 1;
1075 decl = pushdecl (decl);
1077 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1078 decl = build_anon_union_vars (TREE_TYPE (field), ref);
1082 if (main_decl == NULL_TREE)
1089 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1090 anonymous union, then all members must be laid out together. PUBLIC_P
1091 is nonzero if this union is not declared static. */
1094 finish_anon_union (tree anon_union_decl)
1100 if (anon_union_decl == error_mark_node)
1103 type = TREE_TYPE (anon_union_decl);
1104 public_p = TREE_PUBLIC (anon_union_decl);
1106 /* The VAR_DECL's context is the same as the TYPE's context. */
1107 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1109 if (TYPE_FIELDS (type) == NULL_TREE)
1114 error ("namespace-scope anonymous aggregates must be static");
1118 main_decl = build_anon_union_vars (type, anon_union_decl);
1119 if (main_decl == error_mark_node)
1121 if (main_decl == NULL_TREE)
1123 warning (0, "anonymous union with no members");
1127 if (!processing_template_decl)
1129 /* Use main_decl to set the mangled name. */
1130 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1131 mangle_decl (anon_union_decl);
1132 DECL_NAME (anon_union_decl) = NULL_TREE;
1135 pushdecl (anon_union_decl);
1136 if (building_stmt_tree ()
1137 && at_function_scope_p ())
1138 add_decl_expr (anon_union_decl);
1139 else if (!processing_template_decl)
1140 rest_of_decl_compilation (anon_union_decl,
1141 toplevel_bindings_p (), at_eof);
1144 /* Auxiliary functions to make type signatures for
1145 `operator new' and `operator delete' correspond to
1146 what compiler will be expecting. */
1149 coerce_new_type (tree type)
1152 tree args = TYPE_ARG_TYPES (type);
1154 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1156 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1159 error ("%<operator new%> must return type %qT", ptr_type_node);
1162 if (!args || args == void_list_node
1163 || !same_type_p (TREE_VALUE (args), size_type_node))
1166 if (args && args != void_list_node)
1167 args = TREE_CHAIN (args);
1168 pedwarn ("%<operator new%> takes type %<size_t%> (%qT) "
1169 "as first parameter", size_type_node);
1174 args = tree_cons (NULL_TREE, size_type_node, args);
1177 type = build_exception_variant
1178 (build_function_type (ptr_type_node, args),
1179 TYPE_RAISES_EXCEPTIONS (type));
1187 coerce_delete_type (tree type)
1190 tree args = TYPE_ARG_TYPES (type);
1192 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
1194 if (!same_type_p (TREE_TYPE (type), void_type_node))
1197 error ("%<operator delete%> must return type %qT", void_type_node);
1200 if (!args || args == void_list_node
1201 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1204 if (args && args != void_list_node)
1205 args = TREE_CHAIN (args);
1206 error ("%<operator delete%> takes type %qT as first parameter",
1212 args = tree_cons (NULL_TREE, ptr_type_node, args);
1215 type = build_exception_variant
1216 (build_function_type (void_type_node, args),
1217 TYPE_RAISES_EXCEPTIONS (type));
1226 mark_vtable_entries (tree decl)
1229 unsigned HOST_WIDE_INT idx;
1231 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl)),
1236 STRIP_NOPS (fnaddr);
1238 if (TREE_CODE (fnaddr) != ADDR_EXPR
1239 && TREE_CODE (fnaddr) != FDESC_EXPR)
1240 /* This entry is an offset: a virtual base class offset, a
1241 virtual call offset, an RTTI offset, etc. */
1244 fn = TREE_OPERAND (fnaddr, 0);
1245 TREE_ADDRESSABLE (fn) = 1;
1246 /* When we don't have vcall offsets, we output thunks whenever
1247 we output the vtables that contain them. With vcall offsets,
1248 we know all the thunks we'll need when we emit a virtual
1249 function, so we emit the thunks there instead. */
1250 if (DECL_THUNK_P (fn))
1251 use_thunk (fn, /*emit_p=*/0);
1256 /* Set DECL up to have the closest approximation of "initialized common"
1257 linkage available. */
1260 comdat_linkage (tree decl)
1263 make_decl_one_only (decl);
1264 else if (TREE_CODE (decl) == FUNCTION_DECL
1265 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1266 /* We can just emit function and compiler-generated variables
1267 statically; having multiple copies is (for the most part) only
1270 There are two correctness issues, however: the address of a
1271 template instantiation with external linkage should be the
1272 same, independent of what translation unit asks for the
1273 address, and this will not hold when we emit multiple copies of
1274 the function. However, there's little else we can do.
1276 Also, by default, the typeinfo implementation assumes that
1277 there will be only one copy of the string used as the name for
1278 each type. Therefore, if weak symbols are unavailable, the
1279 run-time library should perform a more conservative check; it
1280 should perform a string comparison, rather than an address
1282 TREE_PUBLIC (decl) = 0;
1285 /* Static data member template instantiations, however, cannot
1286 have multiple copies. */
1287 if (DECL_INITIAL (decl) == 0
1288 || DECL_INITIAL (decl) == error_mark_node)
1289 DECL_COMMON (decl) = 1;
1290 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1292 DECL_COMMON (decl) = 1;
1293 DECL_INITIAL (decl) = error_mark_node;
1295 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1297 /* We can't do anything useful; leave vars for explicit
1299 DECL_EXTERNAL (decl) = 1;
1300 DECL_NOT_REALLY_EXTERN (decl) = 0;
1304 if (DECL_LANG_SPECIFIC (decl))
1305 DECL_COMDAT (decl) = 1;
1308 /* For win32 we also want to put explicit instantiations in
1309 linkonce sections, so that they will be merged with implicit
1310 instantiations; otherwise we get duplicate symbol errors.
1311 For Darwin we do not want explicit instantiations to be
1315 maybe_make_one_only (tree decl)
1317 /* We used to say that this was not necessary on targets that support weak
1318 symbols, because the implicit instantiations will defer to the explicit
1319 one. However, that's not actually the case in SVR4; a strong definition
1320 after a weak one is an error. Also, not making explicit
1321 instantiations one_only means that we can end up with two copies of
1322 some template instantiations. */
1326 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1327 we can get away with not emitting them if they aren't used. We need
1328 to for variables so that cp_finish_decl will update their linkage,
1329 because their DECL_INITIAL may not have been set properly yet. */
1331 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1332 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1333 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1335 make_decl_one_only (decl);
1337 if (TREE_CODE (decl) == VAR_DECL)
1339 DECL_COMDAT (decl) = 1;
1340 /* Mark it needed so we don't forget to emit it. */
1341 mark_decl_referenced (decl);
1346 /* Determine whether or not we want to specifically import or export CTYPE,
1347 using various heuristics. */
1350 import_export_class (tree ctype)
1352 /* -1 for imported, 1 for exported. */
1353 int import_export = 0;
1355 /* It only makes sense to call this function at EOF. The reason is
1356 that this function looks at whether or not the first non-inline
1357 non-abstract virtual member function has been defined in this
1358 translation unit. But, we can't possibly know that until we've
1359 seen the entire translation unit. */
1360 gcc_assert (at_eof);
1362 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1365 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1366 we will have CLASSTYPE_INTERFACE_ONLY set but not
1367 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1368 heuristic because someone will supply a #pragma implementation
1369 elsewhere, and deducing it here would produce a conflict. */
1370 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1373 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1375 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1377 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1378 && !flag_implicit_templates)
1379 /* For a template class, without -fimplicit-templates, check the
1380 repository. If the virtual table is assigned to this
1381 translation unit, then export the class; otherwise, import
1383 import_export = repo_export_class_p (ctype) ? 1 : -1;
1384 else if (TYPE_POLYMORPHIC_P (ctype))
1386 /* The ABI specifies that the virtual table and associated
1387 information are emitted with the key method, if any. */
1388 tree method = CLASSTYPE_KEY_METHOD (ctype);
1389 /* If weak symbol support is not available, then we must be
1390 careful not to emit the vtable when the key function is
1391 inline. An inline function can be defined in multiple
1392 translation units. If we were to emit the vtable in each
1393 translation unit containing a definition, we would get
1394 multiple definition errors at link-time. */
1395 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1396 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1399 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1400 a definition anywhere else. */
1401 if (MULTIPLE_SYMBOL_SPACES && import_export == -1)
1404 /* Allow backends the chance to overrule the decision. */
1405 if (targetm.cxx.import_export_class)
1406 import_export = targetm.cxx.import_export_class (ctype, import_export);
1410 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1411 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1415 /* Return true if VAR has already been provided to the back end; in that
1416 case VAR should not be modified further by the front end. */
1418 var_finalized_p (tree var)
1420 return cgraph_varpool_node (var)->finalized;
1423 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1424 must be emitted in this translation unit. Mark it as such. */
1427 mark_needed (tree decl)
1429 /* It's possible that we no longer need to set
1430 TREE_SYMBOL_REFERENCED here directly, but doing so is
1432 TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)) = 1;
1433 mark_decl_referenced (decl);
1436 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1437 returns true if a definition of this entity should be provided in
1438 this object file. Callers use this function to determine whether
1439 or not to let the back end know that a definition of DECL is
1440 available in this translation unit. */
1443 decl_needed_p (tree decl)
1445 gcc_assert (TREE_CODE (decl) == VAR_DECL
1446 || TREE_CODE (decl) == FUNCTION_DECL);
1447 /* This function should only be called at the end of the translation
1448 unit. We cannot be sure of whether or not something will be
1449 COMDAT until that point. */
1450 gcc_assert (at_eof);
1452 /* All entities with external linkage that are not COMDAT should be
1453 emitted; they may be referred to from other object files. */
1454 if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
1456 /* If this entity was used, let the back-end see it; it will decide
1457 whether or not to emit it into the object file. */
1458 if (TREE_USED (decl)
1459 || (DECL_ASSEMBLER_NAME_SET_P (decl)
1460 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
1462 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1463 reference to DECL might cause it to be emitted later. */
1467 /* If necessary, write out the vtables for the dynamic class CTYPE.
1468 Returns true if any vtables were emitted. */
1471 maybe_emit_vtables (tree ctype)
1477 /* If the vtables for this class have already been emitted there is
1478 nothing more to do. */
1479 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1480 if (var_finalized_p (primary_vtbl))
1482 /* Ignore dummy vtables made by get_vtable_decl. */
1483 if (TREE_TYPE (primary_vtbl) == void_type_node)
1486 /* On some targets, we cannot determine the key method until the end
1487 of the translation unit -- which is when this function is
1489 if (!targetm.cxx.key_method_may_be_inline ())
1490 determine_key_method (ctype);
1492 /* See if any of the vtables are needed. */
1493 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1495 import_export_decl (vtbl);
1496 if (DECL_NOT_REALLY_EXTERN (vtbl) && decl_needed_p (vtbl))
1501 /* If the references to this class' vtables are optimized away,
1502 still emit the appropriate debugging information. See
1504 if (DECL_COMDAT (primary_vtbl)
1505 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1506 note_debug_info_needed (ctype);
1510 /* The ABI requires that we emit all of the vtables if we emit any
1512 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1514 /* Mark entities references from the virtual table as used. */
1515 mark_vtable_entries (vtbl);
1517 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1519 tree expr = store_init_value (vtbl, DECL_INITIAL (vtbl));
1521 /* It had better be all done at compile-time. */
1526 DECL_EXTERNAL (vtbl) = 0;
1527 rest_of_decl_compilation (vtbl, 1, 1);
1529 /* Because we're only doing syntax-checking, we'll never end up
1530 actually marking the variable as written. */
1531 if (flag_syntax_only)
1532 TREE_ASM_WRITTEN (vtbl) = 1;
1535 /* Since we're writing out the vtable here, also write the debug
1537 note_debug_info_needed (ctype);
1542 /* A special return value from type_visibility meaning internal
1545 enum { VISIBILITY_ANON = VISIBILITY_INTERNAL+1 };
1547 /* walk_tree helper function for type_visibility. */
1550 min_vis_r (tree *tp, int *walk_subtrees, void *data)
1552 int *vis_p = (int *)data;
1557 else if (CLASS_TYPE_P (*tp))
1559 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp)))
1561 *vis_p = VISIBILITY_ANON;
1564 else if (CLASSTYPE_VISIBILITY (*tp) > *vis_p)
1565 *vis_p = CLASSTYPE_VISIBILITY (*tp);
1570 /* Returns the visibility of TYPE, which is the minimum visibility of its
1574 type_visibility (tree type)
1576 int vis = VISIBILITY_DEFAULT;
1577 walk_tree_without_duplicates (&type, min_vis_r, &vis);
1581 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1582 specified (or if VISIBILITY is static). */
1585 constrain_visibility (tree decl, int visibility)
1587 if (visibility == VISIBILITY_ANON)
1589 /* extern "C" declarations aren't affected by the anonymous
1591 if (!DECL_EXTERN_C_P (decl))
1593 TREE_PUBLIC (decl) = 0;
1594 DECL_INTERFACE_KNOWN (decl) = 1;
1595 if (DECL_LANG_SPECIFIC (decl))
1596 DECL_NOT_REALLY_EXTERN (decl) = 1;
1599 else if (visibility > DECL_VISIBILITY (decl)
1600 && !DECL_VISIBILITY_SPECIFIED (decl))
1602 DECL_VISIBILITY (decl) = visibility;
1608 /* Constrain the visibility of DECL based on the visibility of its template
1612 constrain_visibility_for_template (tree decl, tree targs)
1614 /* If this is a template instantiation, check the innermost
1615 template args for visibility constraints. The outer template
1616 args are covered by the class check. */
1617 tree args = INNERMOST_TEMPLATE_ARGS (targs);
1619 for (i = TREE_VEC_LENGTH (args); i > 0; --i)
1623 tree arg = TREE_VEC_ELT (args, i-1);
1625 vis = type_visibility (arg);
1626 else if (TREE_TYPE (arg) && POINTER_TYPE_P (TREE_TYPE (arg)))
1629 if (TREE_CODE (arg) == ADDR_EXPR)
1630 arg = TREE_OPERAND (arg, 0);
1631 if (TREE_CODE (arg) == VAR_DECL
1632 || TREE_CODE (arg) == FUNCTION_DECL)
1634 if (! TREE_PUBLIC (arg))
1635 vis = VISIBILITY_ANON;
1637 vis = DECL_VISIBILITY (arg);
1641 constrain_visibility (decl, vis);
1645 /* Like c_determine_visibility, but with additional C++-specific
1648 Function-scope entities can rely on the function's visibility because
1649 it is set in start_preparsed_function.
1651 Class-scope entities cannot rely on the class's visibility until the end
1652 of the enclosing class definition.
1654 Note that because namespaces have multiple independent definitions,
1655 namespace visibility is handled elsewhere using the #pragma visibility
1656 machinery rather than by decorating the namespace declaration.
1658 The goal is for constraints from the type to give a diagnostic, and
1659 other constraints to be applied silently. */
1662 determine_visibility (tree decl)
1664 tree class_type = NULL_TREE;
1667 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
1669 /* Only relevant for names with external linkage. */
1670 if (!TREE_PUBLIC (decl))
1673 /* Cloned constructors and destructors get the same visibility as
1674 the underlying function. That should be set up in
1675 maybe_clone_body. */
1676 gcc_assert (!DECL_CLONED_FUNCTION_P (decl));
1678 if (TREE_CODE (decl) == TYPE_DECL)
1680 if (CLASS_TYPE_P (TREE_TYPE (decl)))
1681 use_template = CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl));
1682 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl)))
1687 else if (DECL_LANG_SPECIFIC (decl))
1688 use_template = DECL_USE_TEMPLATE (decl);
1692 /* Anything that is exported must have default visibility. */
1693 if (TARGET_DLLIMPORT_DECL_ATTRIBUTES
1694 && lookup_attribute ("dllexport",
1695 TREE_CODE (decl) == TYPE_DECL
1696 ? TYPE_ATTRIBUTES (TREE_TYPE (decl))
1697 : DECL_ATTRIBUTES (decl)))
1699 DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
1700 DECL_VISIBILITY_SPECIFIED (decl) = 1;
1703 /* If DECL is a member of a class, visibility specifiers on the
1704 class can influence the visibility of the DECL. */
1705 if (DECL_CLASS_SCOPE_P (decl))
1706 class_type = DECL_CONTEXT (decl);
1707 else if (TREE_CODE (decl) == VAR_DECL
1708 && DECL_TINFO_P (decl)
1709 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl))))
1710 class_type = TREE_TYPE (DECL_NAME (decl));
1713 /* Not a class member. */
1715 /* Virtual tables have DECL_CONTEXT set to their associated class,
1716 so they are automatically handled above. */
1717 gcc_assert (TREE_CODE (decl) != VAR_DECL
1718 || !DECL_VTABLE_OR_VTT_P (decl));
1720 if (DECL_FUNCTION_SCOPE_P (decl) && ! DECL_VISIBILITY_SPECIFIED (decl))
1722 /* Local statics and classes get the visibility of their
1723 containing function by default, except that
1724 -fvisibility-inlines-hidden doesn't affect them. */
1725 tree fn = DECL_CONTEXT (decl);
1726 if (DECL_VISIBILITY_SPECIFIED (fn) || ! DECL_CLASS_SCOPE_P (fn))
1728 DECL_VISIBILITY (decl) = DECL_VISIBILITY (fn);
1729 DECL_VISIBILITY_SPECIFIED (decl) =
1730 DECL_VISIBILITY_SPECIFIED (fn);
1733 determine_visibility_from_class (decl, DECL_CONTEXT (fn));
1735 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
1736 but have no TEMPLATE_INFO, so don't try to check it. */
1739 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
1741 /* tinfo visibility is based on the type it's for. */
1742 constrain_visibility
1743 (decl, type_visibility (TREE_TYPE (DECL_NAME (decl))));
1745 else if (use_template)
1746 /* Template instantiations and specializations get visibility based
1747 on their template unless they override it with an attribute. */;
1748 else if (! DECL_VISIBILITY_SPECIFIED (decl))
1750 /* Set default visibility to whatever the user supplied with
1751 #pragma GCC visibility or a namespace visibility attribute. */
1752 DECL_VISIBILITY (decl) = default_visibility;
1753 DECL_VISIBILITY_SPECIFIED (decl) = visibility_options.inpragma;
1759 /* If the specialization doesn't specify visibility, use the
1760 visibility from the template. */
1761 tree tinfo = (TREE_CODE (decl) == TYPE_DECL
1762 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl))
1763 : DECL_TEMPLATE_INFO (decl));
1764 tree args = TI_ARGS (tinfo);
1766 if (args != error_mark_node)
1768 int depth = TMPL_ARGS_DEPTH (args);
1769 tree pattern = DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo));
1771 if (!DECL_VISIBILITY_SPECIFIED (decl))
1773 DECL_VISIBILITY (decl) = DECL_VISIBILITY (pattern);
1774 DECL_VISIBILITY_SPECIFIED (decl)
1775 = DECL_VISIBILITY_SPECIFIED (pattern);
1778 /* FIXME should TMPL_ARGS_DEPTH really return 1 for null input? */
1779 if (args && depth > template_class_depth (class_type))
1780 /* Limit visibility based on its template arguments. */
1781 constrain_visibility_for_template (decl, args);
1786 determine_visibility_from_class (decl, class_type);
1788 if (decl_anon_ns_mem_p (decl))
1789 /* Names in an anonymous namespace get internal linkage.
1790 This might change once we implement export. */
1791 constrain_visibility (decl, VISIBILITY_ANON);
1792 else if (TREE_CODE (decl) != TYPE_DECL)
1794 /* Propagate anonymity from type to decl. */
1795 int tvis = type_visibility (TREE_TYPE (decl));
1796 if (tvis == VISIBILITY_ANON)
1797 constrain_visibility (decl, tvis);
1801 /* By default, static data members and function members receive
1802 the visibility of their containing class. */
1805 determine_visibility_from_class (tree decl, tree class_type)
1807 if (visibility_options.inlines_hidden
1808 /* Don't do this for inline templates; specializations might not be
1809 inline, and we don't want them to inherit the hidden
1810 visibility. We'll set it here for all inline instantiations. */
1811 && !processing_template_decl
1812 && ! DECL_VISIBILITY_SPECIFIED (decl)
1813 && TREE_CODE (decl) == FUNCTION_DECL
1814 && DECL_DECLARED_INLINE_P (decl)
1815 && (! DECL_LANG_SPECIFIC (decl)
1816 || ! DECL_EXPLICIT_INSTANTIATION (decl)))
1817 DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1818 else if (!DECL_VISIBILITY_SPECIFIED (decl))
1820 /* Default to the class visibility. */
1821 DECL_VISIBILITY (decl) = CLASSTYPE_VISIBILITY (class_type);
1822 DECL_VISIBILITY_SPECIFIED (decl)
1823 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type);
1826 /* Give the target a chance to override the visibility associated
1828 if (TREE_CODE (decl) == VAR_DECL
1829 && (DECL_TINFO_P (decl)
1830 || (DECL_VTABLE_OR_VTT_P (decl)
1831 /* Construction virtual tables are not exported because
1832 they cannot be referred to from other object files;
1833 their name is not standardized by the ABI. */
1834 && !DECL_CONSTRUCTION_VTABLE_P (decl)))
1835 && TREE_PUBLIC (decl)
1836 && !DECL_REALLY_EXTERN (decl)
1837 && !DECL_VISIBILITY_SPECIFIED (decl)
1838 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type))
1839 targetm.cxx.determine_class_data_visibility (decl);
1842 /* Constrain the visibility of a class TYPE based on the visibility of its
1843 field types. Warn if any fields require lesser visibility. */
1846 constrain_class_visibility (tree type)
1852 int vis = type_visibility (type);
1854 if (vis == VISIBILITY_ANON
1855 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type)))
1858 /* Don't warn about visibility if the class has explicit visibility. */
1859 if (CLASSTYPE_VISIBILITY_SPECIFIED (type))
1860 vis = VISIBILITY_INTERNAL;
1862 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
1863 if (TREE_CODE (t) == FIELD_DECL && TREE_TYPE (t) != error_mark_node)
1865 tree ftype = strip_array_types (TREE_TYPE (t));
1866 int subvis = type_visibility (ftype);
1868 if (subvis == VISIBILITY_ANON)
1870 %qT has a field %qD whose type uses the anonymous namespace",
1872 else if (IS_AGGR_TYPE (ftype)
1873 && vis < VISIBILITY_HIDDEN
1874 && subvis >= VISIBILITY_HIDDEN)
1875 warning (OPT_Wattributes, "\
1876 %qT declared with greater visibility than the type of its field %qD",
1880 binfo = TYPE_BINFO (type);
1881 for (i = 0; BINFO_BASE_ITERATE (binfo, i, t); ++i)
1883 int subvis = type_visibility (TREE_TYPE (t));
1885 if (subvis == VISIBILITY_ANON)
1887 %qT has a base %qT whose type uses the anonymous namespace",
1888 type, TREE_TYPE (t));
1889 else if (vis < VISIBILITY_HIDDEN
1890 && subvis >= VISIBILITY_HIDDEN)
1891 warning (OPT_Wattributes, "\
1892 %qT declared with greater visibility than its base %qT",
1893 type, TREE_TYPE (t));
1897 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
1898 for DECL has not already been determined, do so now by setting
1899 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
1900 function is called entities with vague linkage whose definitions
1901 are available must have TREE_PUBLIC set.
1903 If this function decides to place DECL in COMDAT, it will set
1904 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
1905 the caller to decide whether or not to clear DECL_EXTERNAL. Some
1906 callers defer that decision until it is clear that DECL is actually
1910 import_export_decl (tree decl)
1915 tree class_type = NULL_TREE;
1917 if (DECL_INTERFACE_KNOWN (decl))
1920 /* We cannot determine what linkage to give to an entity with vague
1921 linkage until the end of the file. For example, a virtual table
1922 for a class will be defined if and only if the key method is
1923 defined in this translation unit. As a further example, consider
1924 that when compiling a translation unit that uses PCH file with
1925 "-frepo" it would be incorrect to make decisions about what
1926 entities to emit when building the PCH; those decisions must be
1927 delayed until the repository information has been processed. */
1928 gcc_assert (at_eof);
1929 /* Object file linkage for explicit instantiations is handled in
1930 mark_decl_instantiated. For static variables in functions with
1931 vague linkage, maybe_commonize_var is used.
1933 Therefore, the only declarations that should be provided to this
1934 function are those with external linkage that are:
1936 * implicit instantiations of function templates
1940 * implicit instantiations of static data members of class
1947 Furthermore, all entities that reach this point must have a
1948 definition available in this translation unit.
1950 The following assertions check these conditions. */
1951 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL
1952 || TREE_CODE (decl) == VAR_DECL);
1953 /* Any code that creates entities with TREE_PUBLIC cleared should
1954 also set DECL_INTERFACE_KNOWN. */
1955 gcc_assert (TREE_PUBLIC (decl));
1956 if (TREE_CODE (decl) == FUNCTION_DECL)
1957 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1958 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl)
1959 || DECL_DECLARED_INLINE_P (decl));
1961 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl)
1962 || DECL_VTABLE_OR_VTT_P (decl)
1963 || DECL_TINFO_P (decl));
1964 /* Check that a definition of DECL is available in this translation
1966 gcc_assert (!DECL_REALLY_EXTERN (decl));
1968 /* Assume that DECL will not have COMDAT linkage. */
1970 /* Assume that DECL will not be imported into this translation
1974 /* See if the repository tells us whether or not to emit DECL in
1975 this translation unit. */
1976 emit_p = repo_emit_p (decl);
1979 else if (emit_p == 1)
1981 /* The repository indicates that this entity should be defined
1982 here. Make sure the back end honors that request. */
1983 if (TREE_CODE (decl) == VAR_DECL)
1985 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl)
1986 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl))
1989 FOR_EACH_CLONE (clone, decl)
1990 mark_needed (clone);
1994 /* Output the definition as an ordinary strong definition. */
1995 DECL_EXTERNAL (decl) = 0;
1996 DECL_INTERFACE_KNOWN (decl) = 1;
2001 /* We have already decided what to do with this DECL; there is no
2002 need to check anything further. */
2004 else if (TREE_CODE (decl) == VAR_DECL && DECL_VTABLE_OR_VTT_P (decl))
2006 class_type = DECL_CONTEXT (decl);
2007 import_export_class (class_type);
2008 if (TYPE_FOR_JAVA (class_type))
2010 else if (CLASSTYPE_INTERFACE_KNOWN (class_type)
2011 && CLASSTYPE_INTERFACE_ONLY (class_type))
2013 else if ((!flag_weak || TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
2014 && !CLASSTYPE_USE_TEMPLATE (class_type)
2015 && CLASSTYPE_KEY_METHOD (class_type)
2016 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type)))
2017 /* The ABI requires that all virtual tables be emitted with
2018 COMDAT linkage. However, on systems where COMDAT symbols
2019 don't show up in the table of contents for a static
2020 archive, or on systems without weak symbols (where we
2021 approximate COMDAT linkage by using internal linkage), the
2022 linker will report errors about undefined symbols because
2023 it will not see the virtual table definition. Therefore,
2024 in the case that we know that the virtual table will be
2025 emitted in only one translation unit, we make the virtual
2026 table an ordinary definition with external linkage. */
2027 DECL_EXTERNAL (decl) = 0;
2028 else if (CLASSTYPE_INTERFACE_KNOWN (class_type))
2030 /* CLASS_TYPE is being exported from this translation unit,
2031 so DECL should be defined here. */
2032 if (!flag_weak && CLASSTYPE_EXPLICIT_INSTANTIATION (class_type))
2033 /* If a class is declared in a header with the "extern
2034 template" extension, then it will not be instantiated,
2035 even in translation units that would normally require
2036 it. Often such classes are explicitly instantiated in
2037 one translation unit. Therefore, the explicit
2038 instantiation must be made visible to other translation
2040 DECL_EXTERNAL (decl) = 0;
2043 /* The generic C++ ABI says that class data is always
2044 COMDAT, even if there is a key function. Some
2045 variants (e.g., the ARM EABI) says that class data
2046 only has COMDAT linkage if the class data might be
2047 emitted in more than one translation unit. When the
2048 key method can be inline and is inline, we still have
2049 to arrange for comdat even though
2050 class_data_always_comdat is false. */
2051 if (!CLASSTYPE_KEY_METHOD (class_type)
2052 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type))
2053 || targetm.cxx.class_data_always_comdat ())
2055 /* The ABI requires COMDAT linkage. Normally, we
2056 only emit COMDAT things when they are needed;
2057 make sure that we realize that this entity is
2064 else if (!flag_implicit_templates
2065 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type))
2070 else if (TREE_CODE (decl) == VAR_DECL && DECL_TINFO_P (decl))
2072 tree type = TREE_TYPE (DECL_NAME (decl));
2073 if (CLASS_TYPE_P (type))
2076 import_export_class (type);
2077 if (CLASSTYPE_INTERFACE_KNOWN (type)
2078 && TYPE_POLYMORPHIC_P (type)
2079 && CLASSTYPE_INTERFACE_ONLY (type)
2080 /* If -fno-rtti was specified, then we cannot be sure
2081 that RTTI information will be emitted with the
2082 virtual table of the class, so we must emit it
2083 wherever it is used. */
2088 if (CLASSTYPE_INTERFACE_KNOWN (type)
2089 && !CLASSTYPE_INTERFACE_ONLY (type))
2091 comdat_p = (targetm.cxx.class_data_always_comdat ()
2092 || (CLASSTYPE_KEY_METHOD (type)
2093 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type))));
2098 DECL_EXTERNAL (decl) = 0;
2108 else if (DECL_TEMPLATE_INSTANTIATION (decl)
2109 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
2111 /* DECL is an implicit instantiation of a function or static
2113 if (flag_implicit_templates
2114 || (flag_implicit_inline_templates
2115 && TREE_CODE (decl) == FUNCTION_DECL
2116 && DECL_DECLARED_INLINE_P (decl)))
2119 /* If we are not implicitly generating templates, then mark
2120 this entity as undefined in this translation unit. */
2123 else if (DECL_FUNCTION_MEMBER_P (decl))
2125 if (!DECL_DECLARED_INLINE_P (decl))
2127 tree ctype = DECL_CONTEXT (decl);
2128 import_export_class (ctype);
2129 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
2131 DECL_NOT_REALLY_EXTERN (decl)
2132 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
2133 || (DECL_DECLARED_INLINE_P (decl)
2134 && ! flag_implement_inlines
2135 && !DECL_VINDEX (decl)));
2137 if (!DECL_NOT_REALLY_EXTERN (decl))
2138 DECL_EXTERNAL (decl) = 1;
2140 /* Always make artificials weak. */
2141 if (DECL_ARTIFICIAL (decl) && flag_weak)
2144 maybe_make_one_only (decl);
2155 /* If we are importing DECL into this translation unit, mark is
2156 an undefined here. */
2157 DECL_EXTERNAL (decl) = 1;
2158 DECL_NOT_REALLY_EXTERN (decl) = 0;
2162 /* If we decided to put DECL in COMDAT, mark it accordingly at
2164 comdat_linkage (decl);
2167 DECL_INTERFACE_KNOWN (decl) = 1;
2170 /* Return an expression that performs the destruction of DECL, which
2171 must be a VAR_DECL whose type has a non-trivial destructor, or is
2172 an array whose (innermost) elements have a non-trivial destructor. */
2175 build_cleanup (tree decl)
2178 tree type = TREE_TYPE (decl);
2180 /* This function should only be called for declarations that really
2181 require cleanups. */
2182 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type));
2184 /* Treat all objects with destructors as used; the destructor may do
2185 something substantive. */
2188 if (TREE_CODE (type) == ARRAY_TYPE)
2192 cxx_mark_addressable (decl);
2193 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
2195 temp = build_delete (TREE_TYPE (temp), temp,
2196 sfk_complete_destructor,
2197 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
2201 /* Returns the initialization guard variable for the variable DECL,
2202 which has static storage duration. */
2205 get_guard (tree decl)
2210 sname = mangle_guard_variable (decl);
2211 guard = IDENTIFIER_GLOBAL_VALUE (sname);
2216 /* We use a type that is big enough to contain a mutex as well
2217 as an integer counter. */
2218 guard_type = targetm.cxx.guard_type ();
2219 guard = build_decl (VAR_DECL, sname, guard_type);
2221 /* The guard should have the same linkage as what it guards. */
2222 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
2223 TREE_STATIC (guard) = TREE_STATIC (decl);
2224 DECL_COMMON (guard) = DECL_COMMON (decl);
2225 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
2226 if (TREE_PUBLIC (decl))
2227 DECL_WEAK (guard) = DECL_WEAK (decl);
2229 DECL_ARTIFICIAL (guard) = 1;
2230 DECL_IGNORED_P (guard) = 1;
2231 TREE_USED (guard) = 1;
2232 pushdecl_top_level_and_finish (guard, NULL_TREE);
2237 /* Return those bits of the GUARD variable that should be set when the
2238 guarded entity is actually initialized. */
2241 get_guard_bits (tree guard)
2243 if (!targetm.cxx.guard_mask_bit ())
2245 /* We only set the first byte of the guard, in order to leave room
2246 for a mutex in the high-order bits. */
2247 guard = build1 (ADDR_EXPR,
2248 build_pointer_type (TREE_TYPE (guard)),
2250 guard = build1 (NOP_EXPR,
2251 build_pointer_type (char_type_node),
2253 guard = build1 (INDIRECT_REF, char_type_node, guard);
2259 /* Return an expression which determines whether or not the GUARD
2260 variable has already been initialized. */
2263 get_guard_cond (tree guard)
2267 /* Check to see if the GUARD is zero. */
2268 guard = get_guard_bits (guard);
2270 /* Mask off all but the low bit. */
2271 if (targetm.cxx.guard_mask_bit ())
2273 guard_value = integer_one_node;
2274 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2275 guard_value = convert (TREE_TYPE (guard), guard_value);
2276 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
2279 guard_value = integer_zero_node;
2280 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
2281 guard_value = convert (TREE_TYPE (guard), guard_value);
2282 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
2285 /* Return an expression which sets the GUARD variable, indicating that
2286 the variable being guarded has been initialized. */
2289 set_guard (tree guard)
2293 /* Set the GUARD to one. */
2294 guard = get_guard_bits (guard);
2295 guard_init = integer_one_node;
2296 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
2297 guard_init = convert (TREE_TYPE (guard), guard_init);
2298 return build_modify_expr (guard, NOP_EXPR, guard_init);
2301 /* Start the process of running a particular set of global constructors
2302 or destructors. Subroutine of do_[cd]tors. */
2305 start_objects (int method_type, int initp)
2311 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2313 if (initp != DEFAULT_INIT_PRIORITY)
2323 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
2326 sprintf (type, "%c", method_type);
2328 fndecl = build_lang_decl (FUNCTION_DECL,
2329 get_file_function_name_long (type),
2330 build_function_type (void_type_node,
2332 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
2334 /* It can be a static function as long as collect2 does not have
2335 to scan the object file to find its ctor/dtor routine. */
2336 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
2338 /* Mark this declaration as used to avoid spurious warnings. */
2339 TREE_USED (current_function_decl) = 1;
2341 /* Mark this function as a global constructor or destructor. */
2342 if (method_type == 'I')
2343 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
2345 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
2346 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
2348 body = begin_compound_stmt (BCS_FN_BODY);
2350 /* We cannot allow these functions to be elided, even if they do not
2351 have external linkage. And, there's no point in deferring
2352 compilation of these functions; they're all going to have to be
2354 DECL_INLINE (current_function_decl) = 0;
2355 DECL_UNINLINABLE (current_function_decl) = 1;
2360 /* Finish the process of running a particular set of global constructors
2361 or destructors. Subroutine of do_[cd]tors. */
2364 finish_objects (int method_type, int initp, tree body)
2369 finish_compound_stmt (body);
2370 fn = finish_function (0);
2371 expand_or_defer_fn (fn);
2373 /* When only doing semantic analysis, and no RTL generation, we
2374 can't call functions that directly emit assembly code; there is
2375 no assembly file in which to put the code. */
2376 if (flag_syntax_only)
2379 if (targetm.have_ctors_dtors)
2381 rtx fnsym = XEXP (DECL_RTL (fn), 0);
2382 cgraph_mark_needed_node (cgraph_node (fn));
2383 if (method_type == 'I')
2384 (* targetm.asm_out.constructor) (fnsym, initp);
2386 (* targetm.asm_out.destructor) (fnsym, initp);
2390 /* The names of the parameters to the function created to handle
2391 initializations and destructions for objects with static storage
2393 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2394 #define PRIORITY_IDENTIFIER "__priority"
2396 /* The name of the function we create to handle initializations and
2397 destructions for objects with static storage duration. */
2398 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2400 /* The declaration for the __INITIALIZE_P argument. */
2401 static GTY(()) tree initialize_p_decl;
2403 /* The declaration for the __PRIORITY argument. */
2404 static GTY(()) tree priority_decl;
2406 /* The declaration for the static storage duration function. */
2407 static GTY(()) tree ssdf_decl;
2409 /* All the static storage duration functions created in this
2410 translation unit. */
2411 static GTY(()) VEC(tree,gc) *ssdf_decls;
2413 /* A map from priority levels to information about that priority
2414 level. There may be many such levels, so efficient lookup is
2416 static splay_tree priority_info_map;
2418 /* Begins the generation of the function that will handle all
2419 initialization and destruction of objects with static storage
2420 duration. The function generated takes two parameters of type
2421 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2422 nonzero, it performs initializations. Otherwise, it performs
2423 destructions. It only performs those initializations or
2424 destructions with the indicated __PRIORITY. The generated function
2427 It is assumed that this function will only be called once per
2428 translation unit. */
2431 start_static_storage_duration_function (unsigned count)
2436 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2438 /* Create the identifier for this function. It will be of the form
2439 SSDF_IDENTIFIER_<number>. */
2440 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2442 /* Create the parameters. */
2443 parm_types = void_list_node;
2444 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2445 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2446 type = build_function_type (void_type_node, parm_types);
2448 /* Create the FUNCTION_DECL itself. */
2449 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2450 get_identifier (id),
2452 TREE_PUBLIC (ssdf_decl) = 0;
2453 DECL_ARTIFICIAL (ssdf_decl) = 1;
2455 /* Put this function in the list of functions to be called from the
2456 static constructors and destructors. */
2459 ssdf_decls = VEC_alloc (tree, gc, 32);
2461 /* Take this opportunity to initialize the map from priority
2462 numbers to information about that priority level. */
2463 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2464 /*delete_key_fn=*/0,
2465 /*delete_value_fn=*/
2466 (splay_tree_delete_value_fn) &free);
2468 /* We always need to generate functions for the
2469 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2470 priorities later, we'll be sure to find the
2471 DEFAULT_INIT_PRIORITY. */
2472 get_priority_info (DEFAULT_INIT_PRIORITY);
2475 VEC_safe_push (tree, gc, ssdf_decls, ssdf_decl);
2477 /* Create the argument list. */
2478 initialize_p_decl = cp_build_parm_decl
2479 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2480 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2481 TREE_USED (initialize_p_decl) = 1;
2482 priority_decl = cp_build_parm_decl
2483 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2484 DECL_CONTEXT (priority_decl) = ssdf_decl;
2485 TREE_USED (priority_decl) = 1;
2487 TREE_CHAIN (initialize_p_decl) = priority_decl;
2488 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2490 /* Put the function in the global scope. */
2491 pushdecl (ssdf_decl);
2493 /* Start the function itself. This is equivalent to declaring the
2496 static void __ssdf (int __initialize_p, init __priority_p);
2498 It is static because we only need to call this function from the
2499 various constructor and destructor functions for this module. */
2500 start_preparsed_function (ssdf_decl,
2501 /*attrs=*/NULL_TREE,
2504 /* Set up the scope of the outermost block in the function. */
2505 body = begin_compound_stmt (BCS_FN_BODY);
2507 /* This function must not be deferred because we are depending on
2508 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2509 DECL_INLINE (ssdf_decl) = 0;
2510 DECL_UNINLINABLE (ssdf_decl) = 1;
2515 /* Finish the generation of the function which performs initialization
2516 and destruction of objects with static storage duration. After
2517 this point, no more such objects can be created. */
2520 finish_static_storage_duration_function (tree body)
2522 /* Close out the function. */
2523 finish_compound_stmt (body);
2524 expand_or_defer_fn (finish_function (0));
2527 /* Return the information about the indicated PRIORITY level. If no
2528 code to handle this level has yet been generated, generate the
2529 appropriate prologue. */
2531 static priority_info
2532 get_priority_info (int priority)
2537 n = splay_tree_lookup (priority_info_map,
2538 (splay_tree_key) priority);
2541 /* Create a new priority information structure, and insert it
2543 pi = XNEW (struct priority_info_s);
2544 pi->initializations_p = 0;
2545 pi->destructions_p = 0;
2546 splay_tree_insert (priority_info_map,
2547 (splay_tree_key) priority,
2548 (splay_tree_value) pi);
2551 pi = (priority_info) n->value;
2556 /* The effective initialization priority of a DECL. */
2558 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
2559 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
2560 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
2562 /* Whether a DECL needs a guard to protect it against multiple
2565 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
2566 || DECL_ONE_ONLY (decl) \
2567 || DECL_WEAK (decl)))
2569 /* Set up to handle the initialization or destruction of DECL. If
2570 INITP is nonzero, we are initializing the variable. Otherwise, we
2571 are destroying it. */
2574 one_static_initialization_or_destruction (tree decl, tree init, bool initp)
2576 tree guard_if_stmt = NULL_TREE;
2579 /* If we are supposed to destruct and there's a trivial destructor,
2580 nothing has to be done. */
2582 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2585 /* Trick the compiler into thinking we are at the file and line
2586 where DECL was declared so that error-messages make sense, and so
2587 that the debugger will show somewhat sensible file and line
2589 input_location = DECL_SOURCE_LOCATION (decl);
2595 Access control for implicit calls to the constructors,
2596 the conversion functions, or the destructor called to
2597 create and destroy a static data member is performed as
2598 if these calls appeared in the scope of the member's
2601 we pretend we are in a static member function of the class of
2602 which the DECL is a member. */
2603 if (member_p (decl))
2605 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2606 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2609 /* Assume we don't need a guard. */
2611 /* We need a guard if this is an object with external linkage that
2612 might be initialized in more than one place. (For example, a
2613 static data member of a template, when the data member requires
2615 if (NEEDS_GUARD_P (decl))
2619 guard = get_guard (decl);
2621 /* When using __cxa_atexit, we just check the GUARD as we would
2622 for a local static. */
2623 if (flag_use_cxa_atexit)
2625 /* When using __cxa_atexit, we never try to destroy
2626 anything from a static destructor. */
2628 guard_cond = get_guard_cond (guard);
2630 /* If we don't have __cxa_atexit, then we will be running
2631 destructors from .fini sections, or their equivalents. So,
2632 we need to know how many times we've tried to initialize this
2633 object. We do initializations only if the GUARD is zero,
2634 i.e., if we are the first to initialize the variable. We do
2635 destructions only if the GUARD is one, i.e., if we are the
2636 last to destroy the variable. */
2639 = cp_build_binary_op (EQ_EXPR,
2640 build_unary_op (PREINCREMENT_EXPR,
2646 = cp_build_binary_op (EQ_EXPR,
2647 build_unary_op (PREDECREMENT_EXPR,
2652 guard_if_stmt = begin_if_stmt ();
2653 finish_if_stmt_cond (guard_cond, guard_if_stmt);
2657 /* If we're using __cxa_atexit, we have not already set the GUARD,
2658 so we must do so now. */
2659 if (guard && initp && flag_use_cxa_atexit)
2660 finish_expr_stmt (set_guard (guard));
2662 /* Perform the initialization or destruction. */
2666 finish_expr_stmt (init);
2668 /* If we're using __cxa_atexit, register a function that calls the
2669 destructor for the object. */
2670 if (flag_use_cxa_atexit)
2671 finish_expr_stmt (register_dtor_fn (decl));
2674 finish_expr_stmt (build_cleanup (decl));
2676 /* Finish the guard if-stmt, if necessary. */
2679 finish_then_clause (guard_if_stmt);
2680 finish_if_stmt (guard_if_stmt);
2683 /* Now that we're done with DECL we don't need to pretend to be a
2684 member of its class any longer. */
2685 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2686 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2689 /* Generate code to do the initialization or destruction of the decls in VARS,
2690 a TREE_LIST of VAR_DECL with static storage duration.
2691 Whether initialization or destruction is performed is specified by INITP. */
2694 do_static_initialization_or_destruction (tree vars, bool initp)
2696 tree node, init_if_stmt, cond;
2698 /* Build the outer if-stmt to check for initialization or destruction. */
2699 init_if_stmt = begin_if_stmt ();
2700 cond = initp ? integer_one_node : integer_zero_node;
2701 cond = cp_build_binary_op (EQ_EXPR,
2704 finish_if_stmt_cond (cond, init_if_stmt);
2708 tree decl = TREE_VALUE (node);
2709 tree priority_if_stmt;
2713 /* If we don't need a destructor, there's nothing to do. Avoid
2714 creating a possibly empty if-stmt. */
2715 if (!initp && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2717 node = TREE_CHAIN (node);
2721 /* Remember that we had an initialization or finalization at this
2723 priority = DECL_EFFECTIVE_INIT_PRIORITY (decl);
2724 pi = get_priority_info (priority);
2726 pi->initializations_p = 1;
2728 pi->destructions_p = 1;
2730 /* Conditionalize this initialization on being in the right priority
2731 and being initializing/finalizing appropriately. */
2732 priority_if_stmt = begin_if_stmt ();
2733 cond = cp_build_binary_op (EQ_EXPR,
2735 build_int_cst (NULL_TREE, priority));
2736 finish_if_stmt_cond (cond, priority_if_stmt);
2738 /* Process initializers with same priority. */
2740 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node)) == priority;
2741 node = TREE_CHAIN (node))
2742 /* Do one initialization or destruction. */
2743 one_static_initialization_or_destruction (TREE_VALUE (node),
2744 TREE_PURPOSE (node), initp);
2746 /* Finish up the priority if-stmt body. */
2747 finish_then_clause (priority_if_stmt);
2748 finish_if_stmt (priority_if_stmt);
2752 /* Finish up the init/destruct if-stmt body. */
2753 finish_then_clause (init_if_stmt);
2754 finish_if_stmt (init_if_stmt);
2757 /* VARS is a list of variables with static storage duration which may
2758 need initialization and/or finalization. Remove those variables
2759 that don't really need to be initialized or finalized, and return
2760 the resulting list. The order in which the variables appear in
2761 VARS is in reverse order of the order in which they should actually
2762 be initialized. The list we return is in the unreversed order;
2763 i.e., the first variable should be initialized first. */
2766 prune_vars_needing_no_initialization (tree *vars)
2769 tree result = NULL_TREE;
2774 tree decl = TREE_VALUE (t);
2775 tree init = TREE_PURPOSE (t);
2777 /* Deal gracefully with error. */
2778 if (decl == error_mark_node)
2780 var = &TREE_CHAIN (t);
2784 /* The only things that can be initialized are variables. */
2785 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2787 /* If this object is not defined, we don't need to do anything
2789 if (DECL_EXTERNAL (decl))
2791 var = &TREE_CHAIN (t);
2795 /* Also, if the initializer already contains errors, we can bail
2797 if (init && TREE_CODE (init) == TREE_LIST
2798 && value_member (error_mark_node, init))
2800 var = &TREE_CHAIN (t);
2804 /* This variable is going to need initialization and/or
2805 finalization, so we add it to the list. */
2806 *var = TREE_CHAIN (t);
2807 TREE_CHAIN (t) = result;
2814 /* Make sure we have told the back end about all the variables in
2818 write_out_vars (tree vars)
2822 for (v = vars; v; v = TREE_CHAIN (v))
2824 tree var = TREE_VALUE (v);
2825 if (!var_finalized_p (var))
2827 import_export_decl (var);
2828 rest_of_decl_compilation (var, 1, 1);
2833 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2834 (otherwise) that will initialize all gobal objects with static
2835 storage duration having the indicated PRIORITY. */
2838 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2847 input_location = *locus;
2848 #ifdef USE_MAPPED_LOCATION
2854 /* We use `I' to indicate initialization and `D' to indicate
2856 function_key = constructor_p ? 'I' : 'D';
2858 /* We emit the function lazily, to avoid generating empty
2859 global constructors and destructors. */
2862 /* For Objective-C++, we may need to initialize metadata found in this module.
2863 This must be done _before_ any other static initializations. */
2864 if (c_dialect_objc () && (priority == DEFAULT_INIT_PRIORITY)
2865 && constructor_p && objc_static_init_needed_p ())
2867 body = start_objects (function_key, priority);
2868 static_ctors = objc_generate_static_init_call (static_ctors);
2871 /* Call the static storage duration function with appropriate
2873 for (i = 0; VEC_iterate (tree, ssdf_decls, i, fndecl); ++i)
2875 /* Calls to pure or const functions will expand to nothing. */
2876 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2879 body = start_objects (function_key, priority);
2881 arguments = tree_cons (NULL_TREE,
2882 build_int_cst (NULL_TREE, priority),
2884 arguments = tree_cons (NULL_TREE,
2885 build_int_cst (NULL_TREE, constructor_p),
2887 finish_expr_stmt (build_function_call (fndecl, arguments));
2891 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2892 calls to any functions marked with attributes indicating that
2893 they should be called at initialization- or destruction-time. */
2894 if (priority == DEFAULT_INIT_PRIORITY)
2898 for (fns = constructor_p ? static_ctors : static_dtors;
2900 fns = TREE_CHAIN (fns))
2902 fndecl = TREE_VALUE (fns);
2904 /* Calls to pure/const functions will expand to nothing. */
2905 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2908 body = start_objects (function_key, priority);
2909 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2914 /* Close out the function. */
2916 finish_objects (function_key, priority, body);
2919 /* Generate constructor and destructor functions for the priority
2923 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2925 location_t *locus = (location_t *) data;
2926 int priority = (int) n->key;
2927 priority_info pi = (priority_info) n->value;
2929 /* Generate the functions themselves, but only if they are really
2931 if (pi->initializations_p
2932 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2933 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2934 if (pi->destructions_p
2935 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2936 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2938 /* Keep iterating. */
2942 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2943 decls referenced from frontend specific constructs; it will be called
2944 only for language-specific tree nodes.
2946 Here we must deal with member pointers. */
2949 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2950 tree from ATTRIBUTE_UNUSED)
2954 switch (TREE_CODE (t))
2957 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2958 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2961 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2962 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2965 if (DECL_VTABLE_OR_VTT_P (t))
2967 /* The ABI requires that all virtual tables be emitted
2968 whenever one of them is. */
2970 for (vtbl = CLASSTYPE_VTABLES (DECL_CONTEXT (t));
2972 vtbl = TREE_CHAIN (vtbl))
2973 mark_decl_referenced (vtbl);
2975 else if (DECL_CONTEXT (t)
2976 && TREE_CODE (DECL_CONTEXT (t)) == FUNCTION_DECL)
2977 /* If we need a static variable in a function, then we
2978 need the containing function. */
2979 mark_decl_referenced (DECL_CONTEXT (t));
2988 /* Java requires that we be able to reference a local address for a
2989 method, and not be confused by PLT entries. If hidden aliases are
2990 supported, emit one for each java function that we've emitted. */
2993 build_java_method_aliases (void)
2995 struct cgraph_node *node;
2997 #ifndef HAVE_GAS_HIDDEN
3001 for (node = cgraph_nodes; node ; node = node->next)
3003 tree fndecl = node->decl;
3005 if (TREE_ASM_WRITTEN (fndecl)
3006 && DECL_CONTEXT (fndecl)
3007 && TYPE_P (DECL_CONTEXT (fndecl))
3008 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl))
3009 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl))
3011 /* Mangle the name in a predictable way; we need to reference
3012 this from a java compiled object file. */
3013 tree oid, nid, alias;
3017 oid = DECL_ASSEMBLER_NAME (fndecl);
3018 oname = IDENTIFIER_POINTER (oid);
3019 gcc_assert (oname[0] == '_' && oname[1] == 'Z');
3020 nname = ACONCAT (("_ZGA", oname+2, NULL));
3021 nid = get_identifier (nname);
3023 alias = make_alias_for (fndecl, nid);
3024 TREE_PUBLIC (alias) = 1;
3025 DECL_VISIBILITY (alias) = VISIBILITY_HIDDEN;
3027 assemble_alias (alias, oid);
3032 /* This routine is called from the last rule in yyparse ().
3033 Its job is to create all the code needed to initialize and
3034 destroy the global aggregates. We do the destruction
3035 first, since that way we only need to reverse the decls once. */
3038 cp_finish_file (void)
3044 unsigned ssdf_count = 0;
3048 locus = input_location;
3051 /* Bad parse errors. Just forget about it. */
3052 if (! global_bindings_p () || current_class_type || decl_namespace_list)
3056 c_common_write_pch ();
3058 #ifdef USE_MAPPED_LOCATION
3061 /* Otherwise, GDB can get confused, because in only knows
3062 about source for LINENO-1 lines. */
3066 /* We now have to write out all the stuff we put off writing out.
3069 o Template specializations that we have not yet instantiated,
3070 but which are needed.
3071 o Initialization and destruction for non-local objects with
3072 static storage duration. (Local objects with static storage
3073 duration are initialized when their scope is first entered,
3074 and are cleaned up via atexit.)
3075 o Virtual function tables.
3077 All of these may cause others to be needed. For example,
3078 instantiating one function may cause another to be needed, and
3079 generating the initializer for an object may cause templates to be
3080 instantiated, etc., etc. */
3082 timevar_push (TV_VARCONST);
3084 emit_support_tinfos ();
3093 /* If there are templates that we've put off instantiating, do
3095 instantiate_pending_templates (retries);
3098 /* Write out virtual tables as required. Note that writing out
3099 the virtual table for a template class may cause the
3100 instantiation of members of that class. If we write out
3101 vtables then we remove the class from our list so we don't
3102 have to look at it again. */
3104 while (keyed_classes != NULL_TREE
3105 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
3108 keyed_classes = TREE_CHAIN (keyed_classes);
3114 tree next = TREE_CHAIN (t);
3118 if (maybe_emit_vtables (TREE_VALUE (next)))
3121 TREE_CHAIN (t) = TREE_CHAIN (next);
3126 next = TREE_CHAIN (t);
3130 /* Write out needed type info variables. We have to be careful
3131 looping through unemitted decls, because emit_tinfo_decl may
3132 cause other variables to be needed. New elements will be
3133 appended, and we remove from the vector those that actually
3135 for (i = VEC_length (tree, unemitted_tinfo_decls);
3136 VEC_iterate (tree, unemitted_tinfo_decls, --i, t);)
3137 if (emit_tinfo_decl (t))
3140 VEC_unordered_remove (tree, unemitted_tinfo_decls, i);
3143 /* The list of objects with static storage duration is built up
3144 in reverse order. We clear STATIC_AGGREGATES so that any new
3145 aggregates added during the initialization of these will be
3146 initialized in the correct order when we next come around the
3148 vars = prune_vars_needing_no_initialization (&static_aggregates);
3152 /* We need to start a new initialization function each time
3153 through the loop. That's because we need to know which
3154 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3155 isn't computed until a function is finished, and written
3156 out. That's a deficiency in the back-end. When this is
3157 fixed, these initialization functions could all become
3158 inline, with resulting performance improvements. */
3161 /* Set the line and file, so that it is obviously not from
3163 input_location = locus;
3164 ssdf_body = start_static_storage_duration_function (ssdf_count);
3166 /* Make sure the back end knows about all the variables. */
3167 write_out_vars (vars);
3169 /* First generate code to do all the initializations. */
3171 do_static_initialization_or_destruction (vars, /*initp=*/true);
3173 /* Then, generate code to do all the destructions. Do these
3174 in reverse order so that the most recently constructed
3175 variable is the first destroyed. If we're using
3176 __cxa_atexit, then we don't need to do this; functions
3177 were registered at initialization time to destroy the
3179 if (!flag_use_cxa_atexit && vars)
3181 vars = nreverse (vars);
3182 do_static_initialization_or_destruction (vars, /*initp=*/false);
3187 /* Finish up the static storage duration function for this
3189 input_location = locus;
3190 finish_static_storage_duration_function (ssdf_body);
3192 /* All those initializations and finalizations might cause
3193 us to need more inline functions, more template
3194 instantiations, etc. */
3197 #ifdef USE_MAPPED_LOCATION
3204 /* Go through the set of inline functions whose bodies have not
3205 been emitted yet. If out-of-line copies of these functions
3206 are required, emit them. */
3207 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3209 /* Does it need synthesizing? */
3210 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
3211 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
3213 /* Even though we're already at the top-level, we push
3214 there again. That way, when we pop back a few lines
3215 hence, all of our state is restored. Otherwise,
3216 finish_function doesn't clean things up, and we end
3217 up with CURRENT_FUNCTION_DECL set. */
3218 push_to_top_level ();
3219 /* The decl's location will mark where it was first
3220 needed. Save that so synthesize method can indicate
3221 where it was needed from, in case of error */
3222 input_location = DECL_SOURCE_LOCATION (decl);
3223 synthesize_method (decl);
3224 pop_from_top_level ();
3228 if (!DECL_SAVED_TREE (decl))
3231 /* We lie to the back-end, pretending that some functions
3232 are not defined when they really are. This keeps these
3233 functions from being put out unnecessarily. But, we must
3234 stop lying when the functions are referenced, or if they
3235 are not comdat since they need to be put out now. If
3236 DECL_INTERFACE_KNOWN, then we have already set
3237 DECL_EXTERNAL appropriately, so there's no need to check
3238 again, and we do not want to clear DECL_EXTERNAL if a
3239 previous call to import_export_decl set it.
3241 This is done in a separate for cycle, because if some
3242 deferred function is contained in another deferred
3243 function later in deferred_fns varray,
3244 rest_of_compilation would skip this function and we
3245 really cannot expand the same function twice. */
3246 import_export_decl (decl);
3247 if (DECL_NOT_REALLY_EXTERN (decl)
3248 && DECL_INITIAL (decl)
3249 && decl_needed_p (decl))
3250 DECL_EXTERNAL (decl) = 0;
3252 /* If we're going to need to write this function out, and
3253 there's already a body for it, create RTL for it now.
3254 (There might be no body if this is a method we haven't
3255 gotten around to synthesizing yet.) */
3256 if (!DECL_EXTERNAL (decl)
3257 && decl_needed_p (decl)
3258 && !TREE_ASM_WRITTEN (decl)
3259 && !cgraph_node (decl)->local.finalized)
3261 /* We will output the function; no longer consider it in this
3263 DECL_DEFER_OUTPUT (decl) = 0;
3264 /* Generate RTL for this function now that we know we
3266 expand_or_defer_fn (decl);
3267 /* If we're compiling -fsyntax-only pretend that this
3268 function has been written out so that we don't try to
3270 if (flag_syntax_only)
3271 TREE_ASM_WRITTEN (decl) = 1;
3276 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
3279 /* Static data members are just like namespace-scope globals. */
3280 for (i = 0; VEC_iterate (tree, pending_statics, i, decl); ++i)
3282 if (var_finalized_p (decl) || DECL_REALLY_EXTERN (decl))
3284 import_export_decl (decl);
3285 /* If this static data member is needed, provide it to the
3287 if (DECL_NOT_REALLY_EXTERN (decl) && decl_needed_p (decl))
3288 DECL_EXTERNAL (decl) = 0;
3290 if (VEC_length (tree, pending_statics) != 0
3291 && wrapup_global_declarations (VEC_address (tree, pending_statics),
3292 VEC_length (tree, pending_statics)))
3299 /* All used inline functions must have a definition at this point. */
3300 for (i = 0; VEC_iterate (tree, deferred_fns, i, decl); ++i)
3302 if (/* Check online inline functions that were actually used. */
3303 TREE_USED (decl) && DECL_DECLARED_INLINE_P (decl)
3304 /* If the definition actually was available here, then the
3305 fact that the function was not defined merely represents
3306 that for some reason (use of a template repository,
3307 #pragma interface, etc.) we decided not to emit the
3309 && !DECL_INITIAL (decl)
3310 /* An explicit instantiation can be used to specify
3311 that the body is in another unit. It will have
3312 already verified there was a definition. */
3313 && !DECL_EXPLICIT_INSTANTIATION (decl))
3315 warning (0, "inline function %q+D used but never defined", decl);
3316 /* Avoid a duplicate warning from check_global_declaration_1. */
3317 TREE_NO_WARNING (decl) = 1;
3321 /* We give C linkage to static constructors and destructors. */
3322 push_lang_context (lang_name_c);
3324 /* Generate initialization and destruction functions for all
3325 priorities for which they are required. */
3326 if (priority_info_map)
3327 splay_tree_foreach (priority_info_map,
3328 generate_ctor_and_dtor_functions_for_priority,
3332 /* If we have a ctor or this is obj-c++ and we need a static init,
3333 call generate_ctor_or_dtor_function. */
3334 if (static_ctors || (c_dialect_objc () && objc_static_init_needed_p ()))
3335 generate_ctor_or_dtor_function (/*constructor_p=*/true,
3336 DEFAULT_INIT_PRIORITY, &locus);
3338 generate_ctor_or_dtor_function (/*constructor_p=*/false,
3339 DEFAULT_INIT_PRIORITY, &locus);
3342 /* We're done with the splay-tree now. */
3343 if (priority_info_map)
3344 splay_tree_delete (priority_info_map);
3346 /* Generate any missing aliases. */
3347 maybe_apply_pending_pragma_weaks ();
3349 /* We're done with static constructors, so we can go back to "C++"
3351 pop_lang_context ();
3353 cgraph_finalize_compilation_unit ();
3356 /* Now, issue warnings about static, but not defined, functions,
3357 etc., and emit debugging information. */
3358 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
3359 if (VEC_length (tree, pending_statics) != 0)
3361 check_global_declarations (VEC_address (tree, pending_statics),
3362 VEC_length (tree, pending_statics));
3363 emit_debug_global_declarations (VEC_address (tree, pending_statics),
3364 VEC_length (tree, pending_statics));
3367 /* Generate hidden aliases for Java. */
3368 build_java_method_aliases ();
3372 /* The entire file is now complete. If requested, dump everything
3376 FILE *stream = dump_begin (TDI_tu, &flags);
3380 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
3381 dump_end (TDI_tu, stream);
3385 timevar_pop (TV_VARCONST);
3387 if (flag_detailed_statistics)
3389 dump_tree_statistics ();
3390 dump_time_statistics ();
3392 input_location = locus;
3394 #ifdef ENABLE_CHECKING
3395 validate_conversion_obstack ();
3396 #endif /* ENABLE_CHECKING */
3399 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
3400 function to call in parse-tree form; it has not yet been
3401 semantically analyzed. ARGS are the arguments to the function.
3402 They have already been semantically analyzed. */
3405 build_offset_ref_call_from_tree (tree fn, tree args)
3414 object = TREE_OPERAND (fn, 0);
3416 if (processing_template_decl)
3418 gcc_assert (TREE_CODE (fn) == DOTSTAR_EXPR
3419 || TREE_CODE (fn) == MEMBER_REF);
3420 if (type_dependent_expression_p (fn)
3421 || any_type_dependent_arguments_p (args))
3422 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
3424 /* Transform the arguments and add the implicit "this"
3425 parameter. That must be done before the FN is transformed
3426 because we depend on the form of FN. */
3427 args = build_non_dependent_args (args);
3428 if (TREE_CODE (fn) == DOTSTAR_EXPR)
3429 object = build_unary_op (ADDR_EXPR, object, 0);
3430 object = build_non_dependent_expr (object);
3431 args = tree_cons (NULL_TREE, object, args);
3432 /* Now that the arguments are done, transform FN. */
3433 fn = build_non_dependent_expr (fn);
3436 /* A qualified name corresponding to a bound pointer-to-member is
3437 represented as an OFFSET_REF:
3439 struct B { void g(); };
3441 void B::g() { (this->*p)(); } */
3442 if (TREE_CODE (fn) == OFFSET_REF)
3444 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
3445 fn = TREE_OPERAND (fn, 1);
3446 fn = get_member_function_from_ptrfunc (&object_addr, fn);
3447 args = tree_cons (NULL_TREE, object_addr, args);
3450 expr = build_function_call (fn, args);
3451 if (processing_template_decl && expr != error_mark_node)
3452 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
3458 check_default_args (tree x)
3460 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
3461 bool saw_def = false;
3462 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
3463 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
3465 if (TREE_PURPOSE (arg))
3469 error ("default argument missing for parameter %P of %q+#D", i, x);
3470 TREE_PURPOSE (arg) = error_mark_node;
3475 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
3476 If DECL is a specialization or implicitly declared class member,
3477 generate the actual definition. */
3480 mark_used (tree decl)
3482 HOST_WIDE_INT saved_processing_template_decl = 0;
3484 /* If DECL is a BASELINK for a single function, then treat it just
3485 like the DECL for the function. Otherwise, if the BASELINK is
3486 for an overloaded function, we don't know which function was
3487 actually used until after overload resolution. */
3488 if (TREE_CODE (decl) == BASELINK)
3490 decl = BASELINK_FUNCTIONS (decl);
3491 if (really_overloaded_fn (decl))
3493 decl = OVL_CURRENT (decl);
3496 TREE_USED (decl) = 1;
3497 if (DECL_CLONED_FUNCTION_P (decl))
3498 TREE_USED (DECL_CLONED_FUNCTION (decl)) = 1;
3499 /* If we don't need a value, then we don't need to synthesize DECL. */
3500 if (skip_evaluation)
3502 /* Normally, we can wait until instantiation-time to synthesize
3503 DECL. However, if DECL is a static data member initialized with
3504 a constant, we need the value right now because a reference to
3505 such a data member is not value-dependent. */
3506 if (TREE_CODE (decl) == VAR_DECL
3507 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl)
3508 && DECL_CLASS_SCOPE_P (decl))
3510 /* Don't try to instantiate members of dependent types. We
3511 cannot just use dependent_type_p here because this function
3512 may be called from fold_non_dependent_expr, and then we may
3513 see dependent types, even though processing_template_decl
3515 if (CLASSTYPE_TEMPLATE_INFO ((DECL_CONTEXT (decl)))
3516 && uses_template_parms (CLASSTYPE_TI_ARGS (DECL_CONTEXT (decl))))
3518 /* Pretend that we are not in a template, even if we are, so
3519 that the static data member initializer will be processed. */
3520 saved_processing_template_decl = processing_template_decl;
3521 processing_template_decl = 0;
3524 if (processing_template_decl)
3527 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3528 && !TREE_ASM_WRITTEN (decl))
3529 /* Remember it, so we can check it was defined. */
3531 if (DECL_DEFERRED_FN (decl))
3534 /* Remember the current location for a function we will end up
3535 synthesizing. Then we can inform the user where it was
3536 required in the case of error. */
3537 if (DECL_ARTIFICIAL (decl) && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3538 && !DECL_THUNK_P (decl))
3539 DECL_SOURCE_LOCATION (decl) = input_location;
3541 note_vague_linkage_fn (decl);
3544 assemble_external (decl);
3546 /* Is it a synthesized method that needs to be synthesized? */
3547 if (TREE_CODE (decl) == FUNCTION_DECL
3548 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3549 && DECL_ARTIFICIAL (decl)
3550 && !DECL_THUNK_P (decl)
3551 && ! DECL_INITIAL (decl)
3552 /* Kludge: don't synthesize for default args. Unfortunately this
3553 rules out initializers of namespace-scoped objects too, but
3554 it's sort-of ok if the implicit ctor or dtor decl keeps
3555 pointing to the class location. */
3556 && current_function_decl)
3558 synthesize_method (decl);
3559 /* If we've already synthesized the method we don't need to
3560 do the instantiation test below. */
3562 else if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3563 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3564 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3565 || (TREE_CODE (decl) == FUNCTION_DECL
3566 && DECL_INLINE (DECL_TEMPLATE_RESULT
3567 (template_for_substitution (decl))))
3568 /* We need to instantiate static data members so that there
3569 initializers are available in integral constant
3571 || (TREE_CODE (decl) == VAR_DECL
3572 && DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))))
3573 /* If this is a function or variable that is an instance of some
3574 template, we now know that we will need to actually do the
3575 instantiation. We check that DECL is not an explicit
3576 instantiation because that is not checked in instantiate_decl.
3578 We put off instantiating functions in order to improve compile
3579 times. Maintaining a stack of active functions is expensive,
3580 and the inliner knows to instantiate any functions it might
3581 need. Therefore, we always try to defer instantiation. */
3582 instantiate_decl (decl, /*defer_ok=*/true,
3583 /*expl_inst_class_mem_p=*/false);
3585 processing_template_decl = saved_processing_template_decl;
3588 #include "gt-cp-decl2.h"