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 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, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, 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 extern cpp_reader *parse_in;
54 /* This structure contains information about the initializations
55 and/or destructions required for a particular priority level. */
56 typedef struct priority_info_s {
57 /* Nonzero if there have been any initializations at this priority
58 throughout the translation unit. */
59 int initializations_p;
60 /* Nonzero if there have been any destructions at this priority
61 throughout the translation unit. */
65 static void mark_vtable_entries (tree);
66 static void grok_function_init (tree, tree);
67 static bool maybe_emit_vtables (tree);
68 static tree build_anon_union_vars (tree);
69 static bool acceptable_java_type (tree);
70 static tree start_objects (int, int);
71 static void finish_objects (int, int, tree);
72 static tree start_static_storage_duration_function (unsigned);
73 static void finish_static_storage_duration_function (tree);
74 static priority_info get_priority_info (int);
75 static void do_static_initialization (tree, tree);
76 static void do_static_destruction (tree);
77 static tree start_static_initialization_or_destruction (tree, int);
78 static void finish_static_initialization_or_destruction (tree);
79 static void generate_ctor_or_dtor_function (bool, int, location_t *);
80 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node,
82 static tree prune_vars_needing_no_initialization (tree *);
83 static void write_out_vars (tree);
84 static void import_export_class (tree);
85 static tree get_guard_bits (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(()) varray_type pending_statics;
91 #define pending_statics_used \
92 (pending_statics ? pending_statics->elements_used : 0)
94 /* A list of functions which were declared inline, but which we
95 may need to emit outline anyway. */
96 static GTY(()) varray_type deferred_fns;
97 #define deferred_fns_used \
98 (deferred_fns ? deferred_fns->elements_used : 0)
100 /* Flag used when debugging spew.c */
102 extern int spew_debug;
104 /* Nonzero if we're done parsing and into end-of-file activities. */
108 /* Functions called along with real static constructors and destructors. */
114 /* Incorporate `const' and `volatile' qualifiers for member functions.
115 FUNCTION is a TYPE_DECL or a FUNCTION_DECL.
116 QUALS is a list of qualifiers. Returns any explicit
117 top-level qualifiers of the method's this pointer, anything other than
118 TYPE_UNQUALIFIED will be an extension. */
121 grok_method_quals (tree ctype, tree function, cp_cv_quals quals)
123 tree fntype = TREE_TYPE (function);
124 tree raises = TYPE_RAISES_EXCEPTIONS (fntype);
125 int type_quals = TYPE_UNQUALIFIED;
126 int this_quals = TYPE_UNQUALIFIED;
128 type_quals = quals & ~TYPE_QUAL_RESTRICT;
129 this_quals = quals & TYPE_QUAL_RESTRICT;
131 ctype = cp_build_qualified_type (ctype, type_quals);
132 fntype = build_method_type_directly (ctype, TREE_TYPE (fntype),
133 (TREE_CODE (fntype) == METHOD_TYPE
134 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype))
135 : TYPE_ARG_TYPES (fntype)));
137 fntype = build_exception_variant (fntype, raises);
139 TREE_TYPE (function) = fntype;
143 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
147 cp_build_parm_decl (tree name, tree type)
149 tree parm = build_decl (PARM_DECL, name, type);
150 /* DECL_ARG_TYPE is only used by the back end and the back end never
152 if (!processing_template_decl)
153 DECL_ARG_TYPE (parm) = type_passed_as (type);
157 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
161 build_artificial_parm (tree name, tree type)
163 tree parm = cp_build_parm_decl (name, type);
164 DECL_ARTIFICIAL (parm) = 1;
165 /* All our artificial parms are implicitly `const'; they cannot be
167 TREE_READONLY (parm) = 1;
171 /* Constructors for types with virtual baseclasses need an "in-charge" flag
172 saying whether this constructor is responsible for initialization of
173 virtual baseclasses or not. All destructors also need this "in-charge"
174 flag, which additionally determines whether or not the destructor should
175 free the memory for the object.
177 This function adds the "in-charge" flag to member function FN if
178 appropriate. It is called from grokclassfn and tsubst.
179 FN must be either a constructor or destructor.
181 The in-charge flag follows the 'this' parameter, and is followed by the
182 VTT parm (if any), then the user-written parms. */
185 maybe_retrofit_in_chrg (tree fn)
187 tree basetype, arg_types, parms, parm, fntype;
189 /* If we've already add the in-charge parameter don't do it again. */
190 if (DECL_HAS_IN_CHARGE_PARM_P (fn))
193 /* When processing templates we can't know, in general, whether or
194 not we're going to have virtual baseclasses. */
195 if (processing_template_decl)
198 /* We don't need an in-charge parameter for constructors that don't
199 have virtual bases. */
200 if (DECL_CONSTRUCTOR_P (fn)
201 && !TYPE_USES_VIRTUAL_BASECLASSES (DECL_CONTEXT (fn)))
204 arg_types = TYPE_ARG_TYPES (TREE_TYPE (fn));
205 basetype = TREE_TYPE (TREE_VALUE (arg_types));
206 arg_types = TREE_CHAIN (arg_types);
208 parms = TREE_CHAIN (DECL_ARGUMENTS (fn));
210 /* If this is a subobject constructor or destructor, our caller will
211 pass us a pointer to our VTT. */
212 if (TYPE_USES_VIRTUAL_BASECLASSES (DECL_CONTEXT (fn)))
214 parm = build_artificial_parm (vtt_parm_identifier, vtt_parm_type);
216 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
217 TREE_CHAIN (parm) = parms;
220 /* ...and then to TYPE_ARG_TYPES. */
221 arg_types = hash_tree_chain (vtt_parm_type, arg_types);
223 DECL_HAS_VTT_PARM_P (fn) = 1;
226 /* Then add the in-charge parm (before the VTT parm). */
227 parm = build_artificial_parm (in_charge_identifier, integer_type_node);
228 TREE_CHAIN (parm) = parms;
230 arg_types = hash_tree_chain (integer_type_node, arg_types);
232 /* Insert our new parameter(s) into the list. */
233 TREE_CHAIN (DECL_ARGUMENTS (fn)) = parms;
235 /* And rebuild the function type. */
236 fntype = build_method_type_directly (basetype, TREE_TYPE (TREE_TYPE (fn)),
238 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)))
239 fntype = build_exception_variant (fntype,
240 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn)));
241 TREE_TYPE (fn) = fntype;
243 /* Now we've got the in-charge parameter. */
244 DECL_HAS_IN_CHARGE_PARM_P (fn) = 1;
247 /* Classes overload their constituent function names automatically.
248 When a function name is declared in a record structure,
249 its name is changed to it overloaded name. Since names for
250 constructors and destructors can conflict, we place a leading
253 CNAME is the name of the class we are grokking for.
255 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
257 FLAGS contains bits saying what's special about today's
258 arguments. 1 == DESTRUCTOR. 2 == OPERATOR.
260 If FUNCTION is a destructor, then we must add the `auto-delete' field
261 as a second parameter. There is some hair associated with the fact
262 that we must "declare" this variable in the manner consistent with the
263 way the rest of the arguments were declared.
265 QUALS are the qualifiers for the this pointer. */
268 grokclassfn (tree ctype, tree function, enum overload_flags flags,
271 tree fn_name = DECL_NAME (function);
272 cp_cv_quals this_quals = TYPE_UNQUALIFIED;
274 /* Even within an `extern "C"' block, members get C++ linkage. See
275 [dcl.link] for details. */
276 SET_DECL_LANGUAGE (function, lang_cplusplus);
278 if (fn_name == NULL_TREE)
280 error ("name missing for member function");
281 fn_name = get_identifier ("<anonymous>");
282 DECL_NAME (function) = fn_name;
286 this_quals = grok_method_quals (ctype, function, quals);
288 if (TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
290 /* Must add the class instance variable up front. */
291 /* Right now we just make this a pointer. But later
292 we may wish to make it special. */
293 tree type = TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (function)));
297 /* The `this' parameter is implicitly `const'; it cannot be
299 this_quals |= TYPE_QUAL_CONST;
300 qual_type = cp_build_qualified_type (type, this_quals);
301 parm = build_artificial_parm (this_identifier, qual_type);
302 c_apply_type_quals_to_decl (this_quals, parm);
303 TREE_CHAIN (parm) = DECL_ARGUMENTS (function);
304 DECL_ARGUMENTS (function) = parm;
307 DECL_CONTEXT (function) = ctype;
309 if (flags == DTOR_FLAG)
310 DECL_DESTRUCTOR_P (function) = 1;
312 if (flags == DTOR_FLAG || DECL_CONSTRUCTOR_P (function))
313 maybe_retrofit_in_chrg (function);
316 /* Create an ARRAY_REF, checking for the user doing things backwards
320 grok_array_decl (tree array_expr, tree index_exp)
324 tree orig_array_expr = array_expr;
325 tree orig_index_exp = index_exp;
327 if (error_operand_p (array_expr) || error_operand_p (index_exp))
328 return error_mark_node;
330 if (processing_template_decl)
332 if (type_dependent_expression_p (array_expr)
333 || type_dependent_expression_p (index_exp))
334 return build_min_nt (ARRAY_REF, array_expr, index_exp,
335 NULL_TREE, NULL_TREE);
336 array_expr = build_non_dependent_expr (array_expr);
337 index_exp = build_non_dependent_expr (index_exp);
340 type = TREE_TYPE (array_expr);
341 my_friendly_assert (type, 20030626);
342 type = non_reference (type);
344 /* If they have an `operator[]', use that. */
345 if (IS_AGGR_TYPE (type) || IS_AGGR_TYPE (TREE_TYPE (index_exp)))
346 expr = build_new_op (ARRAY_REF, LOOKUP_NORMAL,
347 array_expr, index_exp, NULL_TREE,
348 /*overloaded_p=*/NULL);
353 /* Otherwise, create an ARRAY_REF for a pointer or array type.
354 It is a little-known fact that, if `a' is an array and `i' is
355 an int, you can write `i[a]', which means the same thing as
357 if (TREE_CODE (type) == ARRAY_TYPE)
360 p1 = build_expr_type_conversion (WANT_POINTER, array_expr, false);
362 if (TREE_CODE (TREE_TYPE (index_exp)) == ARRAY_TYPE)
365 p2 = build_expr_type_conversion (WANT_POINTER, index_exp, false);
367 i1 = build_expr_type_conversion (WANT_INT | WANT_ENUM, array_expr,
369 i2 = build_expr_type_conversion (WANT_INT | WANT_ENUM, index_exp,
372 if ((p1 && i2) && (i1 && p2))
373 error ("ambiguous conversion for array subscript");
376 array_expr = p1, index_exp = i2;
378 array_expr = p2, index_exp = i1;
381 error ("invalid types `%T[%T]' for array subscript",
382 type, TREE_TYPE (index_exp));
383 return error_mark_node;
386 if (array_expr == error_mark_node || index_exp == error_mark_node)
387 error ("ambiguous conversion for array subscript");
389 expr = build_array_ref (array_expr, index_exp);
391 if (processing_template_decl && expr != error_mark_node)
392 return build_min_non_dep (ARRAY_REF, expr, orig_array_expr, orig_index_exp,
393 NULL_TREE, NULL_TREE);
397 /* Given the cast expression EXP, checking out its validity. Either return
398 an error_mark_node if there was an unavoidable error, return a cast to
399 void for trying to delete a pointer w/ the value 0, or return the
400 call to delete. If DOING_VEC is true, we handle things differently
401 for doing an array delete.
402 Implements ARM $5.3.4. This is called from the parser. */
405 delete_sanity (tree exp, tree size, bool doing_vec, int use_global_delete)
409 if (exp == error_mark_node)
412 if (processing_template_decl)
414 t = build_min (DELETE_EXPR, void_type_node, exp, size);
415 DELETE_EXPR_USE_GLOBAL (t) = use_global_delete;
416 DELETE_EXPR_USE_VEC (t) = doing_vec;
417 TREE_SIDE_EFFECTS (t) = 1;
421 exp = convert_from_reference (exp);
423 /* An array can't have been allocated by new, so complain. */
424 if (TREE_CODE (exp) == VAR_DECL
425 && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
426 warning ("deleting array `%#D'", exp);
428 t = build_expr_type_conversion (WANT_POINTER, exp, true);
430 if (t == NULL_TREE || t == error_mark_node)
432 error ("type `%#T' argument given to `delete', expected pointer",
434 return error_mark_node;
437 type = TREE_TYPE (t);
439 /* As of Valley Forge, you can delete a pointer to const. */
441 /* You can't delete functions. */
442 if (TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE)
444 error ("cannot delete a function. Only pointer-to-objects are valid arguments to `delete'");
445 return error_mark_node;
448 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
449 if (TREE_CODE (TREE_TYPE (type)) == VOID_TYPE)
451 warning ("deleting `%T' is undefined", type);
455 /* Deleting a pointer with the value zero is valid and has no effect. */
456 if (integer_zerop (t))
457 return build1 (NOP_EXPR, void_type_node, t);
460 return build_vec_delete (t, /*maxindex=*/NULL_TREE,
461 sfk_deleting_destructor,
464 return build_delete (type, t, sfk_deleting_destructor,
465 LOOKUP_NORMAL, use_global_delete);
468 /* Report an error if the indicated template declaration is not the
469 sort of thing that should be a member template. */
472 check_member_template (tree tmpl)
476 my_friendly_assert (TREE_CODE (tmpl) == TEMPLATE_DECL, 0);
477 decl = DECL_TEMPLATE_RESULT (tmpl);
479 if (TREE_CODE (decl) == FUNCTION_DECL
480 || (TREE_CODE (decl) == TYPE_DECL
481 && IS_AGGR_TYPE (TREE_TYPE (decl))))
483 if (current_function_decl)
484 /* 14.5.2.2 [temp.mem]
486 A local class shall not have member templates. */
487 error ("invalid declaration of member template `%#D' in local class",
490 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VIRTUAL_P (decl))
492 /* 14.5.2.3 [temp.mem]
494 A member function template shall not be virtual. */
496 ("invalid use of `virtual' in template declaration of `%#D'",
498 DECL_VIRTUAL_P (decl) = 0;
501 /* The debug-information generating code doesn't know what to do
502 with member templates. */
503 DECL_IGNORED_P (tmpl) = 1;
506 error ("template declaration of `%#D'", decl);
509 /* Return true iff TYPE is a valid Java parameter or return type. */
512 acceptable_java_type (tree type)
514 if (TREE_CODE (type) == VOID_TYPE || TYPE_FOR_JAVA (type))
516 if (TREE_CODE (type) == POINTER_TYPE || TREE_CODE (type) == REFERENCE_TYPE)
518 type = TREE_TYPE (type);
519 if (TREE_CODE (type) == RECORD_TYPE)
522 if (! TYPE_FOR_JAVA (type))
524 if (! CLASSTYPE_TEMPLATE_INFO (type))
526 args = CLASSTYPE_TI_ARGS (type);
527 i = TREE_VEC_LENGTH (args);
530 type = TREE_VEC_ELT (args, i);
531 if (TREE_CODE (type) == POINTER_TYPE)
532 type = TREE_TYPE (type);
533 if (! TYPE_FOR_JAVA (type))
542 /* For a METHOD in a Java class CTYPE, return true if
543 the parameter and return types are valid Java types.
544 Otherwise, print appropriate error messages, and return false. */
547 check_java_method (tree method)
550 tree arg_types = TYPE_ARG_TYPES (TREE_TYPE (method));
551 tree ret_type = TREE_TYPE (TREE_TYPE (method));
553 if (!acceptable_java_type (ret_type))
555 error ("Java method '%D' has non-Java return type `%T'",
560 arg_types = TREE_CHAIN (arg_types);
561 if (DECL_HAS_IN_CHARGE_PARM_P (method))
562 arg_types = TREE_CHAIN (arg_types);
563 if (DECL_HAS_VTT_PARM_P (method))
564 arg_types = TREE_CHAIN (arg_types);
566 for (; arg_types != NULL_TREE; arg_types = TREE_CHAIN (arg_types))
568 tree type = TREE_VALUE (arg_types);
569 if (!acceptable_java_type (type))
571 error ("Java method '%D' has non-Java parameter type `%T'",
579 /* Sanity check: report error if this function FUNCTION is not
580 really a member of the class (CTYPE) it is supposed to belong to.
581 TEMPLATE_PARMS is used to specifiy the template parameters of a member
582 template passed as FUNCTION_DECL. If the member template is passed as a
583 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
584 from the declaration. If the function is not a function template, it
586 It returns the original declaration for the function, or NULL_TREE
587 if no declaration was found (and an error was emitted). */
590 check_classfn (tree ctype, tree function, tree template_parms)
595 if (DECL_USE_TEMPLATE (function)
596 && !(TREE_CODE (function) == TEMPLATE_DECL
597 && DECL_TEMPLATE_SPECIALIZATION (function))
598 && is_member_template (DECL_TI_TEMPLATE (function)))
599 /* Since this is a specialization of a member template,
600 we're not going to find the declaration in the class.
603 struct S { template <typename T> void f(T); };
604 template <> void S::f(int);
606 we're not going to find `S::f(int)', but there's no
607 reason we should, either. We let our callers know we didn't
608 find the method, but we don't complain. */
611 /* Basic sanity check: for a template function, the template parameters
612 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
613 if (TREE_CODE (function) == TEMPLATE_DECL)
615 my_friendly_assert (!template_parms
616 || comp_template_parms
618 DECL_TEMPLATE_PARMS (function)),
620 template_parms = DECL_TEMPLATE_PARMS (function);
623 /* OK, is this a definition of a member template? */
624 is_template = (template_parms != NULL_TREE);
626 ix = lookup_fnfields_1 (complete_type (ctype),
627 DECL_CONSTRUCTOR_P (function) ? ctor_identifier :
628 DECL_DESTRUCTOR_P (function) ? dtor_identifier :
629 DECL_NAME (function));
633 tree methods = CLASSTYPE_METHOD_VEC (ctype);
634 tree fndecls, fndecl = 0;
637 const char *format = NULL;
639 pop_p = push_scope (ctype);
640 for (fndecls = TREE_VEC_ELT (methods, ix);
641 fndecls; fndecls = OVL_NEXT (fndecls))
645 fndecl = OVL_CURRENT (fndecls);
646 p1 = TYPE_ARG_TYPES (TREE_TYPE (function));
647 p2 = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
649 /* We cannot simply call decls_match because this doesn't
650 work for static member functions that are pretending to
651 be methods, and because the name may have been changed by
654 /* Get rid of the this parameter on functions that become
656 if (DECL_STATIC_FUNCTION_P (fndecl)
657 && TREE_CODE (TREE_TYPE (function)) == METHOD_TYPE)
658 p1 = TREE_CHAIN (p1);
660 /* A member template definition only matches a member template
662 if (is_template != (TREE_CODE (fndecl) == TEMPLATE_DECL))
665 if (same_type_p (TREE_TYPE (TREE_TYPE (function)),
666 TREE_TYPE (TREE_TYPE (fndecl)))
667 && compparms (p1, p2)
669 || comp_template_parms (template_parms,
670 DECL_TEMPLATE_PARMS (fndecl)))
671 && (DECL_TEMPLATE_SPECIALIZATION (function)
672 == DECL_TEMPLATE_SPECIALIZATION (fndecl))
673 && (!DECL_TEMPLATE_SPECIALIZATION (function)
674 || (DECL_TI_TEMPLATE (function)
675 == DECL_TI_TEMPLATE (fndecl))))
681 return OVL_CURRENT (fndecls);
682 error ("prototype for `%#D' does not match any in class `%T'",
684 is_conv_op = DECL_CONV_FN_P (fndecl);
687 ix = CLASSTYPE_FIRST_CONVERSION_SLOT;
688 fndecls = TREE_VEC_ELT (methods, ix);
691 fndecl = OVL_CURRENT (fndecls);
692 fndecls = OVL_NEXT (fndecls);
694 if (!fndecls && is_conv_op)
696 if (TREE_VEC_LENGTH (methods) > ix)
699 fndecls = TREE_VEC_ELT (methods, ix);
700 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls)))
712 format = "candidates are: %#D";
714 format = "candidate is: %#D";
715 cp_error_at (format, fndecl);
718 else if (!COMPLETE_TYPE_P (ctype))
719 cxx_incomplete_type_error (function, ctype);
721 error ("no `%#D' member function declared in class `%T'",
724 /* If we did not find the method in the class, add it to avoid
725 spurious errors (unless the CTYPE is not yet defined, in which
726 case we'll only confuse ourselves when the function is declared
727 properly within the class. */
728 if (COMPLETE_TYPE_P (ctype))
729 add_method (ctype, function, /*error_p=*/1);
733 /* We have just processed the DECL, which is a static data member.
734 Its initializer, if present, is INIT. The ASMSPEC_TREE, if
735 present, is the assembly-language name for the data member.
736 FLAGS is as for cp_finish_decl. */
739 finish_static_data_member_decl (tree decl, tree init, tree asmspec_tree,
742 my_friendly_assert (TREE_PUBLIC (decl), 0);
744 DECL_CONTEXT (decl) = current_class_type;
746 /* We cannot call pushdecl here, because that would fill in the
747 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
748 the right thing, namely, to put this decl out straight away. */
749 /* current_class_type can be NULL_TREE in case of error. */
750 if (!asmspec_tree && current_class_type)
751 DECL_INITIAL (decl) = error_mark_node;
753 if (! processing_template_decl)
755 if (!pending_statics)
756 VARRAY_TREE_INIT (pending_statics, 32, "pending_statics");
757 VARRAY_PUSH_TREE (pending_statics, decl);
760 if (LOCAL_CLASS_P (current_class_type))
761 pedwarn ("local class `%#T' shall not have static data member `%#D'",
762 current_class_type, decl);
764 /* Static consts need not be initialized in the class definition. */
765 if (init != NULL_TREE && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
767 static int explained = 0;
769 error ("initializer invalid for static member with constructor");
772 error ("(an out of class initialization is required)");
777 /* Force the compiler to know when an uninitialized static const
778 member is being used. */
779 if (CP_TYPE_CONST_P (TREE_TYPE (decl)) && init == 0)
780 TREE_USED (decl) = 1;
781 DECL_INITIAL (decl) = init;
782 DECL_IN_AGGR_P (decl) = 1;
784 cp_finish_decl (decl, init, asmspec_tree, flags);
787 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
788 of a structure component, returning a _DECL node.
789 QUALS is a list of type qualifiers for this decl (such as for declaring
790 const member functions).
792 This is done during the parsing of the struct declaration.
793 The _DECL nodes are chained together and the lot of them
794 are ultimately passed to `build_struct' to make the RECORD_TYPE node.
796 If class A defines that certain functions in class B are friends, then
797 the way I have set things up, it is B who is interested in permission
798 granted by A. However, it is in A's context that these declarations
799 are parsed. By returning a void_type_node, class A does not attempt
800 to incorporate the declarations of the friends within its structure.
802 DO NOT MAKE ANY CHANGES TO THIS CODE WITHOUT MAKING CORRESPONDING
803 CHANGES TO CODE IN `start_method'. */
806 grokfield (const cp_declarator *declarator,
807 cp_decl_specifier_seq *declspecs,
808 tree init, tree asmspec_tree,
812 const char *asmspec = 0;
813 int flags = LOOKUP_ONLYCONVERTING;
815 if (!declspecs->any_specifiers_p
816 && declarator->kind == cdk_id
817 && TREE_CODE (declarator->u.id.name) == SCOPE_REF
818 && (TREE_CODE (TREE_OPERAND (declarator->u.id.name, 1))
821 /* Access declaration */
822 if (! IS_AGGR_TYPE_CODE (TREE_CODE
823 (TREE_OPERAND (declarator->u.id.name, 0))))
825 else if (TREE_COMPLEXITY (declarator->u.id.name) == current_class_depth)
827 return do_class_using_decl (declarator->u.id.name);
831 && TREE_CODE (init) == TREE_LIST
832 && TREE_VALUE (init) == error_mark_node
833 && TREE_CHAIN (init) == NULL_TREE)
836 value = grokdeclarator (declarator, declspecs, FIELD, init != 0, &attrlist);
837 if (! value || error_operand_p (value))
838 /* friend or constructor went bad. */
839 return error_mark_node;
841 if (TREE_CODE (value) == TYPE_DECL && init)
843 error ("typedef `%D' is initialized (use __typeof__ instead)", value);
847 /* Pass friendly classes back. */
848 if (value == void_type_node)
851 /* Pass friend decls back. */
852 if ((TREE_CODE (value) == FUNCTION_DECL
853 || TREE_CODE (value) == TEMPLATE_DECL)
854 && DECL_CONTEXT (value) != current_class_type)
857 if (DECL_NAME (value) != NULL_TREE
858 && IDENTIFIER_POINTER (DECL_NAME (value))[0] == '_'
859 && ! strcmp (IDENTIFIER_POINTER (DECL_NAME (value)), "_vptr"))
860 error ("member `%D' conflicts with virtual function table field name",
863 /* Stash away type declarations. */
864 if (TREE_CODE (value) == TYPE_DECL)
866 DECL_NONLOCAL (value) = 1;
867 DECL_CONTEXT (value) = current_class_type;
869 if (processing_template_decl)
870 value = push_template_decl (value);
875 if (DECL_IN_AGGR_P (value))
877 error ("`%D' is already defined in `%T'", value,
878 DECL_CONTEXT (value));
879 return void_type_node;
883 asmspec = TREE_STRING_POINTER (asmspec_tree);
887 if (TREE_CODE (value) == FUNCTION_DECL)
889 grok_function_init (value, init);
892 else if (pedantic && TREE_CODE (value) != VAR_DECL)
893 /* Already complained in grokdeclarator. */
897 /* We allow initializers to become parameters to base
899 if (TREE_CODE (init) == TREE_LIST)
901 if (TREE_CHAIN (init) == NULL_TREE)
902 init = TREE_VALUE (init);
904 init = digest_init (TREE_TYPE (value), init, (tree *)0);
907 if (!processing_template_decl)
909 if (TREE_CODE (init) == CONST_DECL)
910 init = DECL_INITIAL (init);
911 else if (TREE_READONLY_DECL_P (init))
912 init = decl_constant_value (init);
913 else if (TREE_CODE (init) == CONSTRUCTOR)
914 init = digest_init (TREE_TYPE (value), init, (tree *)0);
915 if (init != error_mark_node && ! TREE_CONSTANT (init))
917 /* We can allow references to things that are effectively
918 static, since references are initialized with the
920 if (TREE_CODE (TREE_TYPE (value)) != REFERENCE_TYPE
921 || (TREE_STATIC (init) == 0
922 && (!DECL_P (init) || DECL_EXTERNAL (init) == 0)))
924 error ("field initializer is not constant");
925 init = error_mark_node;
932 if (processing_template_decl
933 && (TREE_CODE (value) == VAR_DECL || TREE_CODE (value) == FUNCTION_DECL))
935 value = push_template_decl (value);
936 if (error_operand_p (value))
937 return error_mark_node;
941 cplus_decl_attributes (&value, attrlist, 0);
943 if (TREE_CODE (value) == VAR_DECL)
945 finish_static_data_member_decl (value, init, asmspec_tree,
949 if (TREE_CODE (value) == FIELD_DECL)
952 error ("`asm' specifiers are not permitted on non-static data members");
953 if (DECL_INITIAL (value) == error_mark_node)
954 init = error_mark_node;
955 cp_finish_decl (value, init, NULL_TREE, flags);
956 DECL_INITIAL (value) = init;
957 DECL_IN_AGGR_P (value) = 1;
960 if (TREE_CODE (value) == FUNCTION_DECL)
964 /* This must override the asm specifier which was placed
965 by grokclassfn. Lay this out fresh. */
966 SET_DECL_RTL (value, NULL_RTX);
967 change_decl_assembler_name (value, get_identifier (asmspec));
969 if (!DECL_FRIEND_P (value))
970 grok_special_member_properties (value);
972 cp_finish_decl (value, init, asmspec_tree, flags);
974 /* Pass friends back this way. */
975 if (DECL_FRIEND_P (value))
976 return void_type_node;
978 DECL_IN_AGGR_P (value) = 1;
986 /* Like `grokfield', but for bitfields.
987 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
990 grokbitfield (const cp_declarator *declarator,
991 cp_decl_specifier_seq *declspecs, tree width)
993 tree value = grokdeclarator (declarator, declspecs, BITFIELD, 0, NULL);
995 if (! value) return NULL_TREE; /* friends went bad. */
997 /* Pass friendly classes back. */
998 if (TREE_CODE (value) == VOID_TYPE)
999 return void_type_node;
1001 if (TREE_CODE (value) == TYPE_DECL)
1003 error ("cannot declare `%D' to be a bit-field type", value);
1007 /* Usually, finish_struct_1 catches bitfields with invalid types.
1008 But, in the case of bitfields with function type, we confuse
1009 ourselves into thinking they are member functions, so we must
1011 if (TREE_CODE (value) == FUNCTION_DECL)
1013 error ("cannot declare bit-field `%D' with function type",
1018 if (DECL_IN_AGGR_P (value))
1020 error ("`%D' is already defined in the class %T", value,
1021 DECL_CONTEXT (value));
1022 return void_type_node;
1025 if (TREE_STATIC (value))
1027 error ("static member `%D' cannot be a bit-field", value);
1030 cp_finish_decl (value, NULL_TREE, NULL_TREE, 0);
1032 if (width != error_mark_node)
1034 constant_expression_warning (width);
1035 DECL_INITIAL (value) = width;
1036 SET_DECL_C_BIT_FIELD (value);
1039 DECL_IN_AGGR_P (value) = 1;
1043 /* When a function is declared with an initializer,
1044 do the right thing. Currently, there are two possibilities:
1049 // initialization possibility #1.
1050 virtual void f () = 0;
1072 // initialization possibility #2
1079 grok_function_init (tree decl, tree init)
1081 /* An initializer for a function tells how this function should
1083 tree type = TREE_TYPE (decl);
1085 if (TREE_CODE (type) == FUNCTION_TYPE)
1086 error ("initializer specified for non-member function `%D'", decl);
1087 else if (integer_zerop (init))
1088 DECL_PURE_VIRTUAL_P (decl) = 1;
1090 error ("invalid initializer for virtual method `%D'", decl);
1094 cplus_decl_attributes (tree *decl, tree attributes, int flags)
1096 if (*decl == NULL_TREE || *decl == void_type_node)
1099 if (TREE_CODE (*decl) == TEMPLATE_DECL)
1100 decl = &DECL_TEMPLATE_RESULT (*decl);
1102 decl_attributes (decl, attributes, flags);
1104 if (TREE_CODE (*decl) == TYPE_DECL)
1105 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl), TREE_TYPE (*decl));
1108 /* Walks through the namespace- or function-scope anonymous union OBJECT,
1109 building appropriate ALIAS_DECLs. Returns one of the fields for use in
1110 the mangled name. */
1113 build_anon_union_vars (tree object)
1115 tree type = TREE_TYPE (object);
1116 tree main_decl = NULL_TREE;
1119 /* Rather than write the code to handle the non-union case,
1120 just give an error. */
1121 if (TREE_CODE (type) != UNION_TYPE)
1122 error ("anonymous struct not inside named type");
1124 for (field = TYPE_FIELDS (type);
1126 field = TREE_CHAIN (field))
1131 if (DECL_ARTIFICIAL (field))
1133 if (TREE_CODE (field) != FIELD_DECL)
1136 `%#D' invalid; an anonymous union can only have non-static data members",
1141 if (TREE_PRIVATE (field))
1142 cp_pedwarn_at ("private member `%#D' in anonymous union", field);
1143 else if (TREE_PROTECTED (field))
1144 cp_pedwarn_at ("protected member `%#D' in anonymous union", field);
1146 if (processing_template_decl)
1147 ref = build_min_nt (COMPONENT_REF, object,
1148 DECL_NAME (field), NULL_TREE);
1150 ref = build_class_member_access_expr (object, field, NULL_TREE,
1153 if (DECL_NAME (field))
1155 decl = build_decl (ALIAS_DECL, DECL_NAME (field), TREE_TYPE (field));
1156 DECL_INITIAL (decl) = ref;
1157 TREE_PUBLIC (decl) = 0;
1158 TREE_STATIC (decl) = 0;
1159 DECL_EXTERNAL (decl) = 1;
1160 decl = pushdecl (decl);
1162 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field)))
1163 decl = build_anon_union_vars (ref);
1167 if (main_decl == NULL_TREE)
1174 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1175 anonymous union, then all members must be laid out together. PUBLIC_P
1176 is nonzero if this union is not declared static. */
1179 finish_anon_union (tree anon_union_decl)
1181 tree type = TREE_TYPE (anon_union_decl);
1183 bool public_p = TREE_PUBLIC (anon_union_decl);
1185 /* The VAR_DECL's context is the same as the TYPE's context. */
1186 DECL_CONTEXT (anon_union_decl) = DECL_CONTEXT (TYPE_NAME (type));
1188 if (TYPE_FIELDS (type) == NULL_TREE)
1193 error ("namespace-scope anonymous aggregates must be static");
1197 main_decl = build_anon_union_vars (anon_union_decl);
1198 if (main_decl == NULL_TREE)
1200 warning ("anonymous union with no members");
1204 if (!processing_template_decl)
1206 /* Use main_decl to set the mangled name. */
1207 DECL_NAME (anon_union_decl) = DECL_NAME (main_decl);
1208 mangle_decl (anon_union_decl);
1209 DECL_NAME (anon_union_decl) = NULL_TREE;
1212 pushdecl (anon_union_decl);
1213 if (building_stmt_tree ()
1214 && at_function_scope_p ())
1215 add_decl_expr (anon_union_decl);
1216 else if (!processing_template_decl)
1217 rest_of_decl_compilation (anon_union_decl, NULL,
1218 toplevel_bindings_p (), at_eof);
1221 /* Auxiliary functions to make type signatures for
1222 `operator new' and `operator delete' correspond to
1223 what compiler will be expecting. */
1226 coerce_new_type (tree type)
1229 tree args = TYPE_ARG_TYPES (type);
1231 my_friendly_assert (TREE_CODE (type) == FUNCTION_TYPE, 20001107);
1233 if (!same_type_p (TREE_TYPE (type), ptr_type_node))
1234 e = 1, error ("`operator new' must return type `%T'", ptr_type_node);
1236 if (!args || args == void_list_node
1237 || !same_type_p (TREE_VALUE (args), size_type_node))
1240 if (args && args != void_list_node)
1241 args = TREE_CHAIN (args);
1242 pedwarn ("`operator new' takes type `size_t' (`%T') as first parameter", size_type_node);
1247 args = tree_cons (NULL_TREE, size_type_node, args);
1250 type = build_exception_variant
1251 (build_function_type (ptr_type_node, args),
1252 TYPE_RAISES_EXCEPTIONS (type));
1260 coerce_delete_type (tree type)
1263 tree args = TYPE_ARG_TYPES (type);
1265 my_friendly_assert (TREE_CODE (type) == FUNCTION_TYPE, 20001107);
1267 if (!same_type_p (TREE_TYPE (type), void_type_node))
1268 e = 1, error ("`operator delete' must return type `%T'", void_type_node);
1270 if (!args || args == void_list_node
1271 || !same_type_p (TREE_VALUE (args), ptr_type_node))
1274 if (args && args != void_list_node)
1275 args = TREE_CHAIN (args);
1276 error ("`operator delete' takes type `%T' as first parameter", ptr_type_node);
1281 args = tree_cons (NULL_TREE, ptr_type_node, args);
1284 type = build_exception_variant
1285 (build_function_type (void_type_node, args),
1286 TYPE_RAISES_EXCEPTIONS (type));
1295 mark_vtable_entries (tree decl)
1297 tree entries = CONSTRUCTOR_ELTS (DECL_INITIAL (decl));
1299 for (; entries; entries = TREE_CHAIN (entries))
1301 tree fnaddr = TREE_VALUE (entries);
1304 STRIP_NOPS (fnaddr);
1306 if (TREE_CODE (fnaddr) != ADDR_EXPR
1307 && TREE_CODE (fnaddr) != FDESC_EXPR)
1308 /* This entry is an offset: a virtual base class offset, a
1309 virtual call offset, an RTTI offset, etc. */
1312 fn = TREE_OPERAND (fnaddr, 0);
1313 TREE_ADDRESSABLE (fn) = 1;
1314 /* When we don't have vcall offsets, we output thunks whenever
1315 we output the vtables that contain them. With vcall offsets,
1316 we know all the thunks we'll need when we emit a virtual
1317 function, so we emit the thunks there instead. */
1318 if (DECL_THUNK_P (fn))
1319 use_thunk (fn, /*emit_p=*/0);
1324 /* Set DECL up to have the closest approximation of "initialized common"
1325 linkage available. */
1328 comdat_linkage (tree decl)
1331 make_decl_one_only (decl);
1332 else if (TREE_CODE (decl) == FUNCTION_DECL
1333 || (TREE_CODE (decl) == VAR_DECL && DECL_ARTIFICIAL (decl)))
1334 /* We can just emit function and compiler-generated variables
1335 statically; having multiple copies is (for the most part) only
1338 There are two correctness issues, however: the address of a
1339 template instantiation with external linkage should be the
1340 same, independent of what translation unit asks for the
1341 address, and this will not hold when we emit multiple copies of
1342 the function. However, there's little else we can do.
1344 Also, by default, the typeinfo implementation assumes that
1345 there will be only one copy of the string used as the name for
1346 each type. Therefore, if weak symbols are unavailable, the
1347 run-time library should perform a more conservative check; it
1348 should perform a string comparison, rather than an address
1350 TREE_PUBLIC (decl) = 0;
1353 /* Static data member template instantiations, however, cannot
1354 have multiple copies. */
1355 if (DECL_INITIAL (decl) == 0
1356 || DECL_INITIAL (decl) == error_mark_node)
1357 DECL_COMMON (decl) = 1;
1358 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl)))
1360 DECL_COMMON (decl) = 1;
1361 DECL_INITIAL (decl) = error_mark_node;
1363 else if (!DECL_EXPLICIT_INSTANTIATION (decl))
1365 /* We can't do anything useful; leave vars for explicit
1367 DECL_EXTERNAL (decl) = 1;
1368 DECL_NOT_REALLY_EXTERN (decl) = 0;
1372 if (DECL_LANG_SPECIFIC (decl))
1373 DECL_COMDAT (decl) = 1;
1376 /* For win32 we also want to put explicit instantiations in
1377 linkonce sections, so that they will be merged with implicit
1378 instantiations; otherwise we get duplicate symbol errors.
1379 For Darwin we do not want explicit instantiations to be
1383 maybe_make_one_only (tree decl)
1385 /* We used to say that this was not necessary on targets that support weak
1386 symbols, because the implicit instantiations will defer to the explicit
1387 one. However, that's not actually the case in SVR4; a strong definition
1388 after a weak one is an error. Also, not making explicit
1389 instantiations one_only means that we can end up with two copies of
1390 some template instantiations. */
1394 /* We can't set DECL_COMDAT on functions, or finish_file will think
1395 we can get away with not emitting them if they aren't used. We need
1396 to for variables so that cp_finish_decl will update their linkage,
1397 because their DECL_INITIAL may not have been set properly yet. */
1399 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1400 || (! DECL_EXPLICIT_INSTANTIATION (decl)
1401 && ! DECL_TEMPLATE_SPECIALIZATION (decl)))
1403 make_decl_one_only (decl);
1405 if (TREE_CODE (decl) == VAR_DECL)
1407 DECL_COMDAT (decl) = 1;
1408 /* Mark it needed so we don't forget to emit it. */
1409 mark_decl_referenced (decl);
1414 /* Set TREE_PUBLIC and/or DECL_EXTERN on the vtable DECL,
1415 based on TYPE and other static flags.
1417 Note that anything public is tagged TREE_PUBLIC, whether
1418 it's public in this file or in another one. */
1421 import_export_vtable (tree decl, tree type, int final)
1423 if (DECL_INTERFACE_KNOWN (decl))
1426 if (TYPE_FOR_JAVA (type))
1428 TREE_PUBLIC (decl) = 1;
1429 DECL_EXTERNAL (decl) = 1;
1430 DECL_INTERFACE_KNOWN (decl) = 1;
1432 else if (CLASSTYPE_INTERFACE_KNOWN (type))
1434 TREE_PUBLIC (decl) = 1;
1435 DECL_EXTERNAL (decl) = CLASSTYPE_INTERFACE_ONLY (type);
1436 DECL_INTERFACE_KNOWN (decl) = 1;
1440 /* We can only wait to decide if we have real non-inline virtual
1441 functions in our class, or if we come from a template. */
1443 int found = (CLASSTYPE_TEMPLATE_INSTANTIATION (type)
1444 || CLASSTYPE_KEY_METHOD (type) != NULL_TREE);
1446 if (final || ! found)
1448 comdat_linkage (decl);
1449 DECL_EXTERNAL (decl) = 0;
1453 TREE_PUBLIC (decl) = 1;
1454 DECL_EXTERNAL (decl) = 1;
1459 /* Determine whether or not we want to specifically import or export CTYPE,
1460 using various heuristics. */
1463 import_export_class (tree ctype)
1465 /* -1 for imported, 1 for exported. */
1466 int import_export = 0;
1468 /* It only makes sense to call this function at EOF. The reason is
1469 that this function looks at whether or not the first non-inline
1470 non-abstract virtual member function has been defined in this
1471 translation unit. But, we can't possibly know that until we've
1472 seen the entire translation unit. */
1473 my_friendly_assert (at_eof, 20000226);
1475 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1478 /* If MULTIPLE_SYMBOL_SPACES is defined and we saw a #pragma interface,
1479 we will have CLASSTYPE_INTERFACE_ONLY set but not
1480 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1481 heuristic because someone will supply a #pragma implementation
1482 elsewhere, and deducing it here would produce a conflict. */
1483 if (CLASSTYPE_INTERFACE_ONLY (ctype))
1486 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype)))
1488 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype)))
1491 /* If we got -fno-implicit-templates, we import template classes that
1492 weren't explicitly instantiated. */
1493 if (import_export == 0
1494 && CLASSTYPE_IMPLICIT_INSTANTIATION (ctype)
1495 && ! flag_implicit_templates)
1498 /* Base our import/export status on that of the first non-inline,
1499 non-pure virtual function, if any. */
1500 if (import_export == 0
1501 && TYPE_POLYMORPHIC_P (ctype))
1503 tree method = CLASSTYPE_KEY_METHOD (ctype);
1505 /* If weak symbol support is not available, then we must be
1506 careful not to emit the vtable when the key function is
1507 inline. An inline function can be defined in multiple
1508 translation units. If we were to emit the vtable in each
1509 translation unit containing a definition, we would get
1510 multiple definition errors at link-time. */
1511 if (method && (flag_weak || ! DECL_DECLARED_INLINE_P (method)))
1512 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1515 #ifdef MULTIPLE_SYMBOL_SPACES
1516 if (import_export == -1)
1520 /* Allow backends the chance to overrule the decision. */
1521 if (targetm.cxx.import_export_class)
1522 import_export = targetm.cxx.import_export_class (ctype, import_export);
1526 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1527 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1531 /* Return true if VAR has already been provided to the back end; in that
1532 case VAR should not be modified further by the front end. */
1534 var_finalized_p (tree var)
1536 if (flag_unit_at_a_time)
1537 return cgraph_varpool_node (var)->finalized;
1539 return TREE_ASM_WRITTEN (var);
1542 /* If necessary, write out the vtables for the dynamic class CTYPE.
1543 Returns true if any vtables were emitted. */
1546 maybe_emit_vtables (tree ctype)
1550 bool needed = false;
1551 bool weaken_vtables;
1553 /* If the vtables for this class have already been emitted there is
1554 nothing more to do. */
1555 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1556 if (var_finalized_p (primary_vtbl))
1558 /* Ignore dummy vtables made by get_vtable_decl. */
1559 if (TREE_TYPE (primary_vtbl) == void_type_node)
1562 import_export_class (ctype);
1564 /* See if any of the vtables are needed. */
1565 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1567 import_export_vtable (vtbl, ctype, 1);
1568 if (!DECL_EXTERNAL (vtbl) && DECL_NEEDED_P (vtbl))
1573 /* If the references to this class' vtables are optimized away,
1574 still emit the appropriate debugging information. See
1576 if (DECL_COMDAT (primary_vtbl)
1577 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1578 note_debug_info_needed (ctype);
1581 else if (TREE_PUBLIC (vtbl) && !DECL_COMDAT (vtbl))
1584 /* Determine whether to make vtables weak. The ABI requires that we
1585 do so. There are two cases in which we have to violate the ABI
1586 specification: targets where we don't have weak symbols
1587 (obviously), and targets where weak symbols don't appear in
1588 static archives' tables of contents. On such targets, avoiding
1589 undefined symbol link errors requires that we only make a symbol
1590 weak if we know that it will be emitted everywhere it's needed.
1591 So on such targets we don't make vtables weak in the common case
1592 where we're emitting a vtable of a nontemplate class in the
1593 translation unit containing the definition of a noninline key
1595 if (flag_weak && !TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1596 weaken_vtables = true;
1599 if (CLASSTYPE_USE_TEMPLATE (ctype))
1600 weaken_vtables = CLASSTYPE_IMPLICIT_INSTANTIATION (ctype);
1602 weaken_vtables = !CLASSTYPE_KEY_METHOD (ctype)
1603 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (ctype));
1606 weaken_vtables = false;
1608 /* The ABI requires that we emit all of the vtables if we emit any
1610 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1613 import_export_vtable (vtbl, ctype, 1);
1614 mark_vtable_entries (vtbl);
1616 /* If we know that DECL is needed, mark it as such for the varpool. */
1618 cgraph_varpool_mark_needed_node (cgraph_varpool_node (vtbl));
1620 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1622 /* It had better be all done at compile-time. */
1623 if (store_init_value (vtbl, DECL_INITIAL (vtbl)))
1627 if (write_symbols == DWARF_DEBUG || write_symbols == DWARF2_DEBUG)
1629 /* Mark the VAR_DECL node representing the vtable itself as a
1630 "gratuitous" one, thereby forcing dwarfout.c to ignore it.
1631 It is rather important that such things be ignored because
1632 any effort to actually generate DWARF for them will run
1633 into trouble when/if we encounter code like:
1636 struct S { virtual void member (); };
1638 because the artificial declaration of the vtable itself (as
1639 manufactured by the g++ front end) will say that the vtable
1640 is a static member of `S' but only *after* the debug output
1641 for the definition of `S' has already been output. This causes
1642 grief because the DWARF entry for the definition of the vtable
1643 will try to refer back to an earlier *declaration* of the
1644 vtable as a static member of `S' and there won't be one.
1645 We might be able to arrange to have the "vtable static member"
1646 attached to the member list for `S' before the debug info for
1647 `S' get written (which would solve the problem) but that would
1648 require more intrusive changes to the g++ front end. */
1650 DECL_IGNORED_P (vtbl) = 1;
1653 /* Always make vtables weak. Or at least almost always; see above. */
1655 comdat_linkage (vtbl);
1657 rest_of_decl_compilation (vtbl, NULL, 1, 1);
1659 /* Because we're only doing syntax-checking, we'll never end up
1660 actually marking the variable as written. */
1661 if (flag_syntax_only)
1662 TREE_ASM_WRITTEN (vtbl) = 1;
1665 /* Since we're writing out the vtable here, also write the debug
1667 note_debug_info_needed (ctype);
1672 /* Determines the proper settings of TREE_PUBLIC and DECL_EXTERNAL for an
1673 inline function or template instantiation at end-of-file. */
1676 import_export_decl (tree decl)
1678 if (DECL_INTERFACE_KNOWN (decl))
1681 if (DECL_TEMPLATE_INSTANTIATION (decl)
1682 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1684 DECL_NOT_REALLY_EXTERN (decl) = 1;
1685 if ((DECL_IMPLICIT_INSTANTIATION (decl)
1686 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1687 && (flag_implicit_templates
1688 || (flag_implicit_inline_templates
1689 && TREE_CODE (decl) == FUNCTION_DECL
1690 && DECL_DECLARED_INLINE_P (decl))))
1692 if (!TREE_PUBLIC (decl))
1693 /* Templates are allowed to have internal linkage. See
1697 comdat_linkage (decl);
1701 DECL_EXTERNAL (decl) = 1;
1702 DECL_NOT_REALLY_EXTERN (decl) = 0;
1705 else if (DECL_FUNCTION_MEMBER_P (decl))
1707 if (!DECL_DECLARED_INLINE_P (decl))
1709 tree ctype = DECL_CONTEXT (decl);
1710 import_export_class (ctype);
1711 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1713 DECL_NOT_REALLY_EXTERN (decl)
1714 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1715 || (DECL_DECLARED_INLINE_P (decl)
1716 && ! flag_implement_inlines
1717 && !DECL_VINDEX (decl)));
1719 if (!DECL_NOT_REALLY_EXTERN (decl))
1720 DECL_EXTERNAL (decl) = 1;
1722 /* Always make artificials weak. */
1723 if (DECL_ARTIFICIAL (decl) && flag_weak)
1724 comdat_linkage (decl);
1726 maybe_make_one_only (decl);
1730 comdat_linkage (decl);
1733 comdat_linkage (decl);
1735 DECL_INTERFACE_KNOWN (decl) = 1;
1738 /* Here, we only decide whether or not the tinfo node should be
1739 emitted with the vtable. IS_IN_LIBRARY is nonzero iff the
1740 typeinfo for TYPE should be in the runtime library. */
1743 import_export_tinfo (tree decl, tree type, bool is_in_library)
1745 if (DECL_INTERFACE_KNOWN (decl))
1748 if (IS_AGGR_TYPE (type))
1749 import_export_class (type);
1751 if (IS_AGGR_TYPE (type) && CLASSTYPE_INTERFACE_KNOWN (type)
1752 && TYPE_POLYMORPHIC_P (type)
1753 /* If -fno-rtti, we're not necessarily emitting this stuff with
1754 the class, so go ahead and emit it now. This can happen when
1755 a class is used in exception handling. */
1758 DECL_NOT_REALLY_EXTERN (decl) = !CLASSTYPE_INTERFACE_ONLY (type);
1759 DECL_COMDAT (decl) = 0;
1763 DECL_NOT_REALLY_EXTERN (decl) = 1;
1764 DECL_COMDAT (decl) = 1;
1767 /* Now override some cases. */
1769 DECL_COMDAT (decl) = 1;
1770 else if (is_in_library)
1771 DECL_COMDAT (decl) = 0;
1773 DECL_INTERFACE_KNOWN (decl) = 1;
1776 /* Return an expression that performs the destruction of DECL, which
1777 must be a VAR_DECL whose type has a non-trivial destructor, or is
1778 an array whose (innermost) elements have a non-trivial destructor. */
1781 build_cleanup (tree decl)
1784 tree type = TREE_TYPE (decl);
1786 /* This function should only be called for declarations that really
1787 require cleanups. */
1788 my_friendly_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type), 20030106);
1790 /* Treat all objects with destructors as used; the destructor may do
1791 something substantive. */
1794 if (TREE_CODE (type) == ARRAY_TYPE)
1798 cxx_mark_addressable (decl);
1799 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1801 temp = build_delete (TREE_TYPE (temp), temp,
1802 sfk_complete_destructor,
1803 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1807 /* Returns the initialization guard variable for the variable DECL,
1808 which has static storage duration. */
1811 get_guard (tree decl)
1816 sname = mangle_guard_variable (decl);
1817 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1822 /* We use a type that is big enough to contain a mutex as well
1823 as an integer counter. */
1824 guard_type = targetm.cxx.guard_type ();
1825 guard = build_decl (VAR_DECL, sname, guard_type);
1827 /* The guard should have the same linkage as what it guards. */
1828 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1829 TREE_STATIC (guard) = TREE_STATIC (decl);
1830 DECL_COMMON (guard) = DECL_COMMON (decl);
1831 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1832 if (TREE_PUBLIC (decl))
1833 DECL_WEAK (guard) = DECL_WEAK (decl);
1835 DECL_ARTIFICIAL (guard) = 1;
1836 TREE_USED (guard) = 1;
1837 pushdecl_top_level_and_finish (guard, NULL_TREE);
1842 /* Return those bits of the GUARD variable that should be set when the
1843 guarded entity is actually initialized. */
1846 get_guard_bits (tree guard)
1848 if (!targetm.cxx.guard_mask_bit ())
1850 /* We only set the first byte of the guard, in order to leave room
1851 for a mutex in the high-order bits. */
1852 guard = build1 (ADDR_EXPR,
1853 build_pointer_type (TREE_TYPE (guard)),
1855 guard = build1 (NOP_EXPR,
1856 build_pointer_type (char_type_node),
1858 guard = build1 (INDIRECT_REF, char_type_node, guard);
1864 /* Return an expression which determines whether or not the GUARD
1865 variable has already been initialized. */
1868 get_guard_cond (tree guard)
1872 /* Check to see if the GUARD is zero. */
1873 guard = get_guard_bits (guard);
1875 /* Mask off all but the low bit. */
1876 if (targetm.cxx.guard_mask_bit ())
1878 guard_value = integer_one_node;
1879 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
1880 guard_value = convert (TREE_TYPE (guard), guard_value);
1881 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
1884 guard_value = integer_zero_node;
1885 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
1886 guard_value = convert (TREE_TYPE (guard), guard_value);
1887 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
1890 /* Return an expression which sets the GUARD variable, indicating that
1891 the variable being guarded has been initialized. */
1894 set_guard (tree guard)
1898 /* Set the GUARD to one. */
1899 guard = get_guard_bits (guard);
1900 guard_init = integer_one_node;
1901 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
1902 guard_init = convert (TREE_TYPE (guard), guard_init);
1903 return build_modify_expr (guard, NOP_EXPR, guard_init);
1906 /* Start the process of running a particular set of global constructors
1907 or destructors. Subroutine of do_[cd]tors. */
1910 start_objects (int method_type, int initp)
1916 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
1918 if (initp != DEFAULT_INIT_PRIORITY)
1928 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
1931 sprintf (type, "%c", method_type);
1933 fndecl = build_lang_decl (FUNCTION_DECL,
1934 get_file_function_name_long (type),
1935 build_function_type (void_type_node,
1937 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
1939 /* It can be a static function as long as collect2 does not have
1940 to scan the object file to find its ctor/dtor routine. */
1941 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
1943 /* Mark this declaration as used to avoid spurious warnings. */
1944 TREE_USED (current_function_decl) = 1;
1946 /* Mark this function as a global constructor or destructor. */
1947 if (method_type == 'I')
1948 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
1950 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
1951 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
1953 body = begin_compound_stmt (BCS_FN_BODY);
1955 /* We cannot allow these functions to be elided, even if they do not
1956 have external linkage. And, there's no point in deferring
1957 compilation of thes functions; they're all going to have to be
1959 DECL_INLINE (current_function_decl) = 0;
1960 DECL_UNINLINABLE (current_function_decl) = 1;
1965 /* Finish the process of running a particular set of global constructors
1966 or destructors. Subroutine of do_[cd]tors. */
1969 finish_objects (int method_type, int initp, tree body)
1974 finish_compound_stmt (body);
1975 fn = finish_function (0);
1976 expand_or_defer_fn (fn);
1978 /* When only doing semantic analysis, and no RTL generation, we
1979 can't call functions that directly emit assembly code; there is
1980 no assembly file in which to put the code. */
1981 if (flag_syntax_only)
1984 if (targetm.have_ctors_dtors)
1986 rtx fnsym = XEXP (DECL_RTL (fn), 0);
1987 if (method_type == 'I')
1988 (* targetm.asm_out.constructor) (fnsym, initp);
1990 (* targetm.asm_out.destructor) (fnsym, initp);
1994 /* The names of the parameters to the function created to handle
1995 initializations and destructions for objects with static storage
1997 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
1998 #define PRIORITY_IDENTIFIER "__priority"
2000 /* The name of the function we create to handle initializations and
2001 destructions for objects with static storage duration. */
2002 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2004 /* The declaration for the __INITIALIZE_P argument. */
2005 static GTY(()) tree initialize_p_decl;
2007 /* The declaration for the __PRIORITY argument. */
2008 static GTY(()) tree priority_decl;
2010 /* The declaration for the static storage duration function. */
2011 static GTY(()) tree ssdf_decl;
2013 /* All the static storage duration functions created in this
2014 translation unit. */
2015 static GTY(()) varray_type ssdf_decls;
2017 /* A map from priority levels to information about that priority
2018 level. There may be many such levels, so efficient lookup is
2020 static splay_tree priority_info_map;
2022 /* Begins the generation of the function that will handle all
2023 initialization and destruction of objects with static storage
2024 duration. The function generated takes two parameters of type
2025 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2026 nonzero, it performs initializations. Otherwise, it performs
2027 destructions. It only performs those initializations or
2028 destructions with the indicated __PRIORITY. The generated function
2031 It is assumed that this function will only be called once per
2032 translation unit. */
2035 start_static_storage_duration_function (unsigned count)
2040 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2042 /* Create the identifier for this function. It will be of the form
2043 SSDF_IDENTIFIER_<number>. */
2044 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2046 /* Create the parameters. */
2047 parm_types = void_list_node;
2048 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2049 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2050 type = build_function_type (void_type_node, parm_types);
2052 /* Create the FUNCTION_DECL itself. */
2053 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2054 get_identifier (id),
2056 TREE_PUBLIC (ssdf_decl) = 0;
2057 DECL_ARTIFICIAL (ssdf_decl) = 1;
2059 /* Put this function in the list of functions to be called from the
2060 static constructors and destructors. */
2063 VARRAY_TREE_INIT (ssdf_decls, 32, "ssdf_decls");
2065 /* Take this opportunity to initialize the map from priority
2066 numbers to information about that priority level. */
2067 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2068 /*delete_key_fn=*/0,
2069 /*delete_value_fn=*/
2070 (splay_tree_delete_value_fn) &free);
2072 /* We always need to generate functions for the
2073 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2074 priorities later, we'll be sure to find the
2075 DEFAULT_INIT_PRIORITY. */
2076 get_priority_info (DEFAULT_INIT_PRIORITY);
2079 VARRAY_PUSH_TREE (ssdf_decls, ssdf_decl);
2081 /* Create the argument list. */
2082 initialize_p_decl = cp_build_parm_decl
2083 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2084 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2085 TREE_USED (initialize_p_decl) = 1;
2086 priority_decl = cp_build_parm_decl
2087 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2088 DECL_CONTEXT (priority_decl) = ssdf_decl;
2089 TREE_USED (priority_decl) = 1;
2091 TREE_CHAIN (initialize_p_decl) = priority_decl;
2092 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2094 /* Put the function in the global scope. */
2095 pushdecl (ssdf_decl);
2097 /* Start the function itself. This is equivalent to declaring the
2100 static void __ssdf (int __initialize_p, init __priority_p);
2102 It is static because we only need to call this function from the
2103 various constructor and destructor functions for this module. */
2104 start_preparsed_function (ssdf_decl,
2105 /*attrs=*/NULL_TREE,
2108 /* Set up the scope of the outermost block in the function. */
2109 body = begin_compound_stmt (BCS_FN_BODY);
2111 /* This function must not be deferred because we are depending on
2112 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2113 DECL_INLINE (ssdf_decl) = 0;
2114 DECL_UNINLINABLE (ssdf_decl) = 1;
2119 /* Finish the generation of the function which performs initialization
2120 and destruction of objects with static storage duration. After
2121 this point, no more such objects can be created. */
2124 finish_static_storage_duration_function (tree body)
2126 /* Close out the function. */
2127 finish_compound_stmt (body);
2128 expand_or_defer_fn (finish_function (0));
2131 /* Return the information about the indicated PRIORITY level. If no
2132 code to handle this level has yet been generated, generate the
2133 appropriate prologue. */
2135 static priority_info
2136 get_priority_info (int priority)
2141 n = splay_tree_lookup (priority_info_map,
2142 (splay_tree_key) priority);
2145 /* Create a new priority information structure, and insert it
2147 pi = xmalloc (sizeof (struct priority_info_s));
2148 pi->initializations_p = 0;
2149 pi->destructions_p = 0;
2150 splay_tree_insert (priority_info_map,
2151 (splay_tree_key) priority,
2152 (splay_tree_value) pi);
2155 pi = (priority_info) n->value;
2160 /* Set up to handle the initialization or destruction of DECL. If
2161 INITP is nonzero, we are initializing the variable. Otherwise, we
2162 are destroying it. */
2165 start_static_initialization_or_destruction (tree decl, int initp)
2167 tree guard_if_stmt = NULL_TREE;
2174 /* Figure out the priority for this declaration. */
2175 priority = DECL_INIT_PRIORITY (decl);
2177 priority = DEFAULT_INIT_PRIORITY;
2179 /* Remember that we had an initialization or finalization at this
2181 pi = get_priority_info (priority);
2183 pi->initializations_p = 1;
2185 pi->destructions_p = 1;
2187 /* Trick the compiler into thinking we are at the file and line
2188 where DECL was declared so that error-messages make sense, and so
2189 that the debugger will show somewhat sensible file and line
2191 input_location = DECL_SOURCE_LOCATION (decl);
2197 Access control for implicit calls to the constructors,
2198 the conversion functions, or the destructor called to
2199 create and destroy a static data member is performed as
2200 if these calls appeared in the scope of the member's
2203 we pretend we are in a static member function of the class of
2204 which the DECL is a member. */
2205 if (member_p (decl))
2207 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2208 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2211 /* Conditionalize this initialization on being in the right priority
2212 and being initializing/finalizing appropriately. */
2213 guard_if_stmt = begin_if_stmt ();
2214 cond = cp_build_binary_op (EQ_EXPR,
2216 build_int_2 (priority, 0));
2217 init_cond = initp ? integer_one_node : integer_zero_node;
2218 init_cond = cp_build_binary_op (EQ_EXPR,
2221 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, init_cond);
2223 /* Assume we don't need a guard. */
2225 /* We need a guard if this is an object with external linkage that
2226 might be initialized in more than one place. (For example, a
2227 static data member of a template, when the data member requires
2229 if (TREE_PUBLIC (decl) && (DECL_COMMON (decl)
2230 || DECL_ONE_ONLY (decl)
2231 || DECL_WEAK (decl)))
2235 guard = get_guard (decl);
2237 /* When using __cxa_atexit, we just check the GUARD as we would
2238 for a local static. */
2239 if (flag_use_cxa_atexit)
2241 /* When using __cxa_atexit, we never try to destroy
2242 anything from a static destructor. */
2243 my_friendly_assert (initp, 20000629);
2244 guard_cond = get_guard_cond (guard);
2246 /* If we don't have __cxa_atexit, then we will be running
2247 destructors from .fini sections, or their equivalents. So,
2248 we need to know how many times we've tried to initialize this
2249 object. We do initializations only if the GUARD is zero,
2250 i.e., if we are the first to initialize the variable. We do
2251 destructions only if the GUARD is one, i.e., if we are the
2252 last to destroy the variable. */
2255 = cp_build_binary_op (EQ_EXPR,
2256 build_unary_op (PREINCREMENT_EXPR,
2262 = cp_build_binary_op (EQ_EXPR,
2263 build_unary_op (PREDECREMENT_EXPR,
2268 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, guard_cond);
2271 finish_if_stmt_cond (cond, guard_if_stmt);
2273 /* If we're using __cxa_atexit, we have not already set the GUARD,
2274 so we must do so now. */
2275 if (guard && initp && flag_use_cxa_atexit)
2276 finish_expr_stmt (set_guard (guard));
2278 return guard_if_stmt;
2281 /* We've just finished generating code to do an initialization or
2282 finalization. GUARD_IF_STMT is the if-statement we used to guard
2283 the initialization. */
2286 finish_static_initialization_or_destruction (tree guard_if_stmt)
2288 finish_then_clause (guard_if_stmt);
2289 finish_if_stmt (guard_if_stmt);
2291 /* Now that we're done with DECL we don't need to pretend to be a
2292 member of its class any longer. */
2293 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2294 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2297 /* Generate code to do the initialization of DECL, a VAR_DECL with
2298 static storage duration. The initialization is INIT. */
2301 do_static_initialization (tree decl, tree init)
2305 /* Set up for the initialization. */
2307 = start_static_initialization_or_destruction (decl,
2310 /* Perform the initialization. */
2312 finish_expr_stmt (init);
2314 /* If we're using __cxa_atexit, register a a function that calls the
2315 destructor for the object. */
2316 if (flag_use_cxa_atexit)
2317 register_dtor_fn (decl);
2320 finish_static_initialization_or_destruction (guard_if_stmt);
2323 /* Generate code to do the static destruction of DECL. If DECL may be
2324 initialized more than once in different object files, GUARD is the
2325 guard variable to check. PRIORITY is the priority for the
2329 do_static_destruction (tree decl)
2333 /* If we're using __cxa_atexit, then destructors are registered
2334 immediately after objects are initialized. */
2335 my_friendly_assert (!flag_use_cxa_atexit, 20000121);
2337 /* If we don't need a destructor, there's nothing to do. */
2338 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2341 /* Actually do the destruction. */
2342 guard_if_stmt = start_static_initialization_or_destruction (decl,
2344 finish_expr_stmt (build_cleanup (decl));
2345 finish_static_initialization_or_destruction (guard_if_stmt);
2348 /* VARS is a list of variables with static storage duration which may
2349 need initialization and/or finalization. Remove those variables
2350 that don't really need to be initialized or finalized, and return
2351 the resulting list. The order in which the variables appear in
2352 VARS is in reverse order of the order in which they should actually
2353 be initialized. The list we return is in the unreversed order;
2354 i.e., the first variable should be initialized first. */
2357 prune_vars_needing_no_initialization (tree *vars)
2360 tree result = NULL_TREE;
2365 tree decl = TREE_VALUE (t);
2366 tree init = TREE_PURPOSE (t);
2368 /* Deal gracefully with error. */
2369 if (decl == error_mark_node)
2371 var = &TREE_CHAIN (t);
2375 /* The only things that can be initialized are variables. */
2376 my_friendly_assert (TREE_CODE (decl) == VAR_DECL, 19990420);
2378 /* If this object is not defined, we don't need to do anything
2380 if (DECL_EXTERNAL (decl))
2382 var = &TREE_CHAIN (t);
2386 /* Also, if the initializer already contains errors, we can bail
2388 if (init && TREE_CODE (init) == TREE_LIST
2389 && value_member (error_mark_node, init))
2391 var = &TREE_CHAIN (t);
2395 /* This variable is going to need initialization and/or
2396 finalization, so we add it to the list. */
2397 *var = TREE_CHAIN (t);
2398 TREE_CHAIN (t) = result;
2405 /* Make sure we have told the back end about all the variables in
2409 write_out_vars (tree vars)
2413 for (v = vars; v; v = TREE_CHAIN (v))
2414 if (!var_finalized_p (TREE_VALUE (v)))
2415 rest_of_decl_compilation (TREE_VALUE (v), 0, 1, 1);
2418 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2419 (otherwise) that will initialize all gobal objects with static
2420 storage duration having the indicated PRIORITY. */
2423 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2432 input_location = *locus;
2433 #ifdef USE_MAPPED_LOCATION
2439 /* We use `I' to indicate initialization and `D' to indicate
2441 function_key = constructor_p ? 'I' : 'D';
2443 /* We emit the function lazily, to avoid generating empty
2444 global constructors and destructors. */
2447 /* Call the static storage duration function with appropriate
2450 for (i = 0; i < ssdf_decls->elements_used; ++i)
2452 fndecl = VARRAY_TREE (ssdf_decls, i);
2454 /* Calls to pure or const functions will expand to nothing. */
2455 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2458 body = start_objects (function_key, priority);
2460 arguments = tree_cons (NULL_TREE, build_int_2 (priority, 0),
2462 arguments = tree_cons (NULL_TREE, build_int_2 (constructor_p, 0),
2464 finish_expr_stmt (build_function_call (fndecl, arguments));
2468 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2469 calls to any functions marked with attributes indicating that
2470 they should be called at initialization- or destruction-time. */
2471 if (priority == DEFAULT_INIT_PRIORITY)
2475 for (fns = constructor_p ? static_ctors : static_dtors;
2477 fns = TREE_CHAIN (fns))
2479 fndecl = TREE_VALUE (fns);
2481 /* Calls to pure/const functions will expand to nothing. */
2482 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2485 body = start_objects (function_key, priority);
2486 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2491 /* Close out the function. */
2493 finish_objects (function_key, priority, body);
2496 /* Generate constructor and destructor functions for the priority
2500 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2502 location_t *locus = data;
2503 int priority = (int) n->key;
2504 priority_info pi = (priority_info) n->value;
2506 /* Generate the functions themselves, but only if they are really
2508 if (pi->initializations_p
2509 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2510 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2511 if (pi->destructions_p
2512 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2513 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2515 /* Keep iterating. */
2519 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2520 decls referenced from frontend specific constructs; it will be called
2521 only for language-specific tree nodes.
2523 Here we must deal with member pointers. */
2526 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2527 tree from ATTRIBUTE_UNUSED)
2531 if (flag_unit_at_a_time)
2532 switch (TREE_CODE (t))
2535 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2536 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2539 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2540 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2550 /* This routine is called from the last rule in yyparse ().
2551 Its job is to create all the code needed to initialize and
2552 destroy the global aggregates. We do the destruction
2553 first, since that way we only need to reverse the decls once. */
2562 unsigned ssdf_count = 0;
2564 locus = input_location;
2567 /* Bad parse errors. Just forget about it. */
2568 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2572 c_common_write_pch ();
2574 #ifdef USE_MAPPED_LOCATION
2577 /* Otherwise, GDB can get confused, because in only knows
2578 about source for LINENO-1 lines. */
2582 interface_unknown = 1;
2585 /* We now have to write out all the stuff we put off writing out.
2588 o Template specializations that we have not yet instantiated,
2589 but which are needed.
2590 o Initialization and destruction for non-local objects with
2591 static storage duration. (Local objects with static storage
2592 duration are initialized when their scope is first entered,
2593 and are cleaned up via atexit.)
2594 o Virtual function tables.
2596 All of these may cause others to be needed. For example,
2597 instantiating one function may cause another to be needed, and
2598 generating the initializer for an object may cause templates to be
2599 instantiated, etc., etc. */
2601 timevar_push (TV_VARCONST);
2603 emit_support_tinfos ();
2608 size_t n_old, n_new;
2612 /* If there are templates that we've put off instantiating, do
2614 instantiate_pending_templates ();
2617 /* Write out virtual tables as required. Note that writing out
2618 the virtual table for a template class may cause the
2619 instantiation of members of that class. If we write out
2620 vtables then we remove the class from our list so we don't
2621 have to look at it again. */
2623 while (keyed_classes != NULL_TREE
2624 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2627 keyed_classes = TREE_CHAIN (keyed_classes);
2633 tree next = TREE_CHAIN (t);
2637 if (maybe_emit_vtables (TREE_VALUE (next)))
2640 TREE_CHAIN (t) = TREE_CHAIN (next);
2645 next = TREE_CHAIN (t);
2649 /* Write out needed type info variables. We have to be careful
2650 looping through unemitted decls, because emit_tinfo_decl may
2651 cause other variables to be needed. We stick new elements
2652 (and old elements that we may need to reconsider) at the end
2653 of the array, then shift them back to the beginning once we're
2656 n_old = VARRAY_ACTIVE_SIZE (unemitted_tinfo_decls);
2657 for (i = 0; i < n_old; ++i)
2659 tree tinfo_decl = VARRAY_TREE (unemitted_tinfo_decls, i);
2660 if (emit_tinfo_decl (tinfo_decl))
2663 VARRAY_PUSH_TREE (unemitted_tinfo_decls, tinfo_decl);
2666 /* The only elements we want to keep are the new ones. Copy
2667 them to the beginning of the array, then get rid of the
2669 n_new = VARRAY_ACTIVE_SIZE (unemitted_tinfo_decls) - n_old;
2671 memmove (&VARRAY_TREE (unemitted_tinfo_decls, 0),
2672 &VARRAY_TREE (unemitted_tinfo_decls, n_old),
2673 n_new * sizeof (tree));
2674 memset (&VARRAY_TREE (unemitted_tinfo_decls, n_new),
2675 0, n_old * sizeof (tree));
2676 VARRAY_ACTIVE_SIZE (unemitted_tinfo_decls) = n_new;
2678 /* The list of objects with static storage duration is built up
2679 in reverse order. We clear STATIC_AGGREGATES so that any new
2680 aggregates added during the initialization of these will be
2681 initialized in the correct order when we next come around the
2683 vars = prune_vars_needing_no_initialization (&static_aggregates);
2689 /* We need to start a new initialization function each time
2690 through the loop. That's because we need to know which
2691 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2692 isn't computed until a function is finished, and written
2693 out. That's a deficiency in the back-end. When this is
2694 fixed, these initialization functions could all become
2695 inline, with resulting performance improvements. */
2698 /* Set the line and file, so that it is obviously not from
2700 input_location = locus;
2701 ssdf_body = start_static_storage_duration_function (ssdf_count);
2703 /* Make sure the back end knows about all the variables. */
2704 write_out_vars (vars);
2706 /* First generate code to do all the initializations. */
2707 for (v = vars; v; v = TREE_CHAIN (v))
2708 do_static_initialization (TREE_VALUE (v),
2711 /* Then, generate code to do all the destructions. Do these
2712 in reverse order so that the most recently constructed
2713 variable is the first destroyed. If we're using
2714 __cxa_atexit, then we don't need to do this; functions
2715 were registered at initialization time to destroy the
2717 if (!flag_use_cxa_atexit)
2719 vars = nreverse (vars);
2720 for (v = vars; v; v = TREE_CHAIN (v))
2721 do_static_destruction (TREE_VALUE (v));
2726 /* Finish up the static storage duration function for this
2728 input_location = locus;
2729 finish_static_storage_duration_function (ssdf_body);
2731 /* All those initializations and finalizations might cause
2732 us to need more inline functions, more template
2733 instantiations, etc. */
2736 #ifdef USE_MAPPED_LOCATION
2743 for (i = 0; i < deferred_fns_used; ++i)
2745 tree decl = VARRAY_TREE (deferred_fns, i);
2747 if (! DECL_DECLARED_INLINE_P (decl) || ! TREE_USED (decl))
2750 /* Does it need synthesizing? */
2751 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2753 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2755 /* Even though we're already at the top-level, we push
2756 there again. That way, when we pop back a few lines
2757 hence, all of our state is restored. Otherwise,
2758 finish_function doesn't clean things up, and we end
2759 up with CURRENT_FUNCTION_DECL set. */
2760 push_to_top_level ();
2761 synthesize_method (decl);
2762 pop_from_top_level ();
2766 if (!DECL_SAVED_TREE (decl))
2769 import_export_decl (decl);
2771 /* We lie to the back-end, pretending that some functions
2772 are not defined when they really are. This keeps these
2773 functions from being put out unnecessarily. But, we must
2774 stop lying when the functions are referenced, or if they
2775 are not comdat since they need to be put out now. This
2776 is done in a separate for cycle, because if some deferred
2777 function is contained in another deferred function later
2778 in deferred_fns varray, rest_of_compilation would skip
2779 this function and we really cannot expand the same
2781 if (DECL_NOT_REALLY_EXTERN (decl)
2782 && DECL_INITIAL (decl)
2783 && DECL_NEEDED_P (decl))
2784 DECL_EXTERNAL (decl) = 0;
2786 /* If we're going to need to write this function out, and
2787 there's already a body for it, create RTL for it now.
2788 (There might be no body if this is a method we haven't
2789 gotten around to synthesizing yet.) */
2790 if (!DECL_EXTERNAL (decl)
2791 && DECL_NEEDED_P (decl)
2792 && !TREE_ASM_WRITTEN (decl)
2793 && (!flag_unit_at_a_time
2794 || !cgraph_node (decl)->local.finalized))
2796 /* We will output the function; no longer consider it in this
2798 DECL_DEFER_OUTPUT (decl) = 0;
2799 /* Generate RTL for this function now that we know we
2801 expand_or_defer_fn (decl);
2802 /* If we're compiling -fsyntax-only pretend that this
2803 function has been written out so that we don't try to
2805 if (flag_syntax_only)
2806 TREE_ASM_WRITTEN (decl) = 1;
2811 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
2814 /* Static data members are just like namespace-scope globals. */
2815 for (i = 0; i < pending_statics_used; ++i)
2817 tree decl = VARRAY_TREE (pending_statics, i);
2818 if (var_finalized_p (decl))
2820 import_export_decl (decl);
2821 if (DECL_NOT_REALLY_EXTERN (decl) && ! DECL_IN_AGGR_P (decl))
2822 DECL_EXTERNAL (decl) = 0;
2825 && wrapup_global_declarations (&VARRAY_TREE (pending_statics, 0),
2826 pending_statics_used))
2829 if (cgraph_assemble_pending_functions ())
2834 /* All used inline functions must have a definition at this point. */
2835 for (i = 0; i < deferred_fns_used; ++i)
2837 tree decl = VARRAY_TREE (deferred_fns, i);
2839 if (!TREE_ASM_WRITTEN (decl) && !DECL_SAVED_TREE (decl)
2840 /* An explicit instantiation can be used to specify
2841 that the body is in another unit. It will have
2842 already verified there was a definition. */
2843 && !DECL_EXPLICIT_INSTANTIATION (decl))
2845 cp_warning_at ("inline function `%D' used but never defined", decl);
2846 /* This symbol is effectively an "extern" declaration now.
2847 This is not strictly necessary, but removes a duplicate
2849 TREE_PUBLIC (decl) = 1;
2854 /* We give C linkage to static constructors and destructors. */
2855 push_lang_context (lang_name_c);
2857 /* Generate initialization and destruction functions for all
2858 priorities for which they are required. */
2859 if (priority_info_map)
2860 splay_tree_foreach (priority_info_map,
2861 generate_ctor_and_dtor_functions_for_priority,
2867 generate_ctor_or_dtor_function (/*constructor_p=*/true,
2868 DEFAULT_INIT_PRIORITY, &locus);
2870 generate_ctor_or_dtor_function (/*constructor_p=*/false,
2871 DEFAULT_INIT_PRIORITY, &locus);
2874 /* We're done with the splay-tree now. */
2875 if (priority_info_map)
2876 splay_tree_delete (priority_info_map);
2878 /* We're done with static constructors, so we can go back to "C++"
2880 pop_lang_context ();
2882 if (flag_unit_at_a_time)
2884 cgraph_finalize_compilation_unit ();
2888 /* Emit mudflap static registration function. This must be done
2889 after all the user functions have been expanded. */
2891 mudflap_finish_file ();
2893 /* Now, issue warnings about static, but not defined, functions,
2894 etc., and emit debugging information. */
2895 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
2896 if (pending_statics)
2897 check_global_declarations (&VARRAY_TREE (pending_statics, 0),
2898 pending_statics_used);
2902 /* The entire file is now complete. If requested, dump everything
2906 FILE *stream = dump_begin (TDI_tu, &flags);
2910 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
2911 dump_end (TDI_tu, stream);
2915 timevar_pop (TV_VARCONST);
2917 if (flag_detailed_statistics)
2919 dump_tree_statistics ();
2920 dump_time_statistics ();
2922 input_location = locus;
2924 #ifdef ENABLE_CHECKING
2925 validate_conversion_obstack ();
2926 #endif /* ENABLE_CHECKING */
2929 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
2930 function to call in parse-tree form; it has not yet been
2931 semantically analyzed. ARGS are the arguments to the function.
2932 They have already been semantically analyzed. */
2935 build_offset_ref_call_from_tree (tree fn, tree args)
2944 object = TREE_OPERAND (fn, 0);
2946 if (processing_template_decl)
2948 my_friendly_assert (TREE_CODE (fn) == DOTSTAR_EXPR
2949 || TREE_CODE (fn) == MEMBER_REF,
2951 if (type_dependent_expression_p (fn)
2952 || any_type_dependent_arguments_p (args))
2953 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
2955 /* Transform the arguments and add the implicit "this"
2956 parameter. That must be done before the FN is transformed
2957 because we depend on the form of FN. */
2958 args = build_non_dependent_args (args);
2959 if (TREE_CODE (fn) == DOTSTAR_EXPR)
2960 object = build_unary_op (ADDR_EXPR, object, 0);
2961 object = build_non_dependent_expr (object);
2962 args = tree_cons (NULL_TREE, object, args);
2963 /* Now that the arguments are done, transform FN. */
2964 fn = build_non_dependent_expr (fn);
2967 /* A qualified name corresponding to a bound pointer-to-member is
2968 represented as an OFFSET_REF:
2970 struct B { void g(); };
2972 void B::g() { (this->*p)(); } */
2973 if (TREE_CODE (fn) == OFFSET_REF)
2975 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
2976 fn = TREE_OPERAND (fn, 1);
2977 fn = get_member_function_from_ptrfunc (&object_addr, fn);
2978 args = tree_cons (NULL_TREE, object_addr, args);
2981 expr = build_function_call (fn, args);
2982 if (processing_template_decl && expr != error_mark_node)
2983 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
2989 check_default_args (tree x)
2991 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
2992 bool saw_def = false;
2993 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
2994 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
2996 if (TREE_PURPOSE (arg))
3000 cp_error_at ("default argument missing for parameter %P of `%+#D'",
3008 mark_used (tree decl)
3010 TREE_USED (decl) = 1;
3011 if (processing_template_decl || skip_evaluation)
3014 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3015 && !TREE_ASM_WRITTEN (decl))
3016 /* Remember it, so we can check it was defined. */
3018 if (DECL_DEFERRED_FN (decl))
3020 DECL_DEFERRED_FN (decl) = 1;
3021 DECL_DEFER_OUTPUT (decl) = 1;
3023 VARRAY_TREE_INIT (deferred_fns, 32, "deferred_fns");
3025 VARRAY_PUSH_TREE (deferred_fns, decl);
3028 assemble_external (decl);
3030 /* Is it a synthesized method that needs to be synthesized? */
3031 if (TREE_CODE (decl) == FUNCTION_DECL
3032 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3033 && DECL_ARTIFICIAL (decl)
3034 && !DECL_THUNK_P (decl)
3035 && ! DECL_INITIAL (decl)
3036 /* Kludge: don't synthesize for default args. */
3037 && current_function_decl)
3039 synthesize_method (decl);
3040 /* If we've already synthesized the method we don't need to
3041 instantiate it, so we can return right away. */
3045 /* If this is a function or variable that is an instance of some
3046 template, we now know that we will need to actually do the
3047 instantiation. We check that DECL is not an explicit
3048 instantiation because that is not checked in instantiate_decl. */
3049 if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3050 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3051 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3052 || (TREE_CODE (decl) == FUNCTION_DECL
3053 && DECL_INLINE (DECL_TEMPLATE_RESULT
3054 (template_for_substitution (decl))))))
3058 /* Normally, we put off instantiating functions in order to
3059 improve compile times. Maintaining a stack of active
3060 functions is expensive, and the inliner knows to
3061 instantiate any functions it might need.
3063 However, if instantiating this function might help us mark
3064 the current function TREE_NOTHROW, we go ahead and
3067 This is not needed for unit-at-a-time since we reorder the functions
3068 in topological order anyway.
3070 defer = (!flag_exceptions
3071 || flag_unit_at_a_time
3073 || TREE_CODE (decl) != FUNCTION_DECL
3074 /* If the called function can't throw, we don't need to
3075 generate its body to find that out. */
3076 || TREE_NOTHROW (decl)
3078 || !current_function_decl
3079 /* If we already know the current function can't throw,
3080 then we don't need to work hard to prove it. */
3081 || TREE_NOTHROW (current_function_decl)
3082 /* If we already know that the current function *can*
3083 throw, there's no point in gathering more
3085 || cp_function_chain->can_throw);
3087 instantiate_decl (decl, defer, /*undefined_ok=*/0);
3091 #include "gt-cp-decl2.h"