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 import_export = (DECL_REALLY_EXTERN (method) ? -1 : 1);
1508 #ifdef MULTIPLE_SYMBOL_SPACES
1509 if (import_export == -1)
1515 SET_CLASSTYPE_INTERFACE_KNOWN (ctype);
1516 CLASSTYPE_INTERFACE_ONLY (ctype) = (import_export < 0);
1520 /* Return true if VAR has already been provided to the back end; in that
1521 case VAR should not be modified further by the front end. */
1523 var_finalized_p (tree var)
1525 if (flag_unit_at_a_time)
1526 return cgraph_varpool_node (var)->finalized;
1528 return TREE_ASM_WRITTEN (var);
1531 /* If necessary, write out the vtables for the dynamic class CTYPE.
1532 Returns true if any vtables were emitted. */
1535 maybe_emit_vtables (tree ctype)
1539 bool needed = false;
1540 bool weaken_vtables;
1542 /* If the vtables for this class have already been emitted there is
1543 nothing more to do. */
1544 primary_vtbl = CLASSTYPE_VTABLES (ctype);
1545 if (var_finalized_p (primary_vtbl))
1547 /* Ignore dummy vtables made by get_vtable_decl. */
1548 if (TREE_TYPE (primary_vtbl) == void_type_node)
1551 import_export_class (ctype);
1553 /* See if any of the vtables are needed. */
1554 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1556 import_export_vtable (vtbl, ctype, 1);
1557 if (!DECL_EXTERNAL (vtbl) && DECL_NEEDED_P (vtbl))
1562 /* If the references to this class' vtables are optimized away,
1563 still emit the appropriate debugging information. See
1565 if (DECL_COMDAT (primary_vtbl)
1566 && CLASSTYPE_DEBUG_REQUESTED (ctype))
1567 note_debug_info_needed (ctype);
1570 else if (TREE_PUBLIC (vtbl) && !DECL_COMDAT (vtbl))
1573 /* Determine whether to make vtables weak. The ABI requires that we
1574 do so. There are two cases in which we have to violate the ABI
1575 specification: targets where we don't have weak symbols
1576 (obviously), and targets where weak symbols don't appear in
1577 static archives' tables of contents. On such targets, avoiding
1578 undefined symbol link errors requires that we only make a symbol
1579 weak if we know that it will be emitted everywhere it's needed.
1580 So on such targets we don't make vtables weak in the common case
1581 where we're emitting a vtable of a nontemplate class in the
1582 translation unit containing the definition of a noninline key
1584 if (flag_weak && !TARGET_WEAK_NOT_IN_ARCHIVE_TOC)
1585 weaken_vtables = true;
1588 if (CLASSTYPE_USE_TEMPLATE (ctype))
1589 weaken_vtables = CLASSTYPE_IMPLICIT_INSTANTIATION (ctype);
1591 weaken_vtables = !CLASSTYPE_KEY_METHOD (ctype)
1592 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (ctype));
1595 weaken_vtables = false;
1597 /* The ABI requires that we emit all of the vtables if we emit any
1599 for (vtbl = CLASSTYPE_VTABLES (ctype); vtbl; vtbl = TREE_CHAIN (vtbl))
1602 import_export_vtable (vtbl, ctype, 1);
1603 mark_vtable_entries (vtbl);
1605 /* If we know that DECL is needed, mark it as such for the varpool. */
1607 cgraph_varpool_mark_needed_node (cgraph_varpool_node (vtbl));
1609 if (TREE_TYPE (DECL_INITIAL (vtbl)) == 0)
1611 /* It had better be all done at compile-time. */
1612 if (store_init_value (vtbl, DECL_INITIAL (vtbl)))
1616 if (write_symbols == DWARF_DEBUG || write_symbols == DWARF2_DEBUG)
1618 /* Mark the VAR_DECL node representing the vtable itself as a
1619 "gratuitous" one, thereby forcing dwarfout.c to ignore it.
1620 It is rather important that such things be ignored because
1621 any effort to actually generate DWARF for them will run
1622 into trouble when/if we encounter code like:
1625 struct S { virtual void member (); };
1627 because the artificial declaration of the vtable itself (as
1628 manufactured by the g++ front end) will say that the vtable
1629 is a static member of `S' but only *after* the debug output
1630 for the definition of `S' has already been output. This causes
1631 grief because the DWARF entry for the definition of the vtable
1632 will try to refer back to an earlier *declaration* of the
1633 vtable as a static member of `S' and there won't be one.
1634 We might be able to arrange to have the "vtable static member"
1635 attached to the member list for `S' before the debug info for
1636 `S' get written (which would solve the problem) but that would
1637 require more intrusive changes to the g++ front end. */
1639 DECL_IGNORED_P (vtbl) = 1;
1642 /* Always make vtables weak. Or at least almost always; see above. */
1644 comdat_linkage (vtbl);
1646 rest_of_decl_compilation (vtbl, NULL, 1, 1);
1648 /* Because we're only doing syntax-checking, we'll never end up
1649 actually marking the variable as written. */
1650 if (flag_syntax_only)
1651 TREE_ASM_WRITTEN (vtbl) = 1;
1654 /* Since we're writing out the vtable here, also write the debug
1656 note_debug_info_needed (ctype);
1661 /* Determines the proper settings of TREE_PUBLIC and DECL_EXTERNAL for an
1662 inline function or template instantiation at end-of-file. */
1665 import_export_decl (tree decl)
1667 if (DECL_INTERFACE_KNOWN (decl))
1670 if (DECL_TEMPLATE_INSTANTIATION (decl)
1671 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1673 DECL_NOT_REALLY_EXTERN (decl) = 1;
1674 if ((DECL_IMPLICIT_INSTANTIATION (decl)
1675 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl))
1676 && (flag_implicit_templates
1677 || (flag_implicit_inline_templates
1678 && TREE_CODE (decl) == FUNCTION_DECL
1679 && DECL_DECLARED_INLINE_P (decl))))
1681 if (!TREE_PUBLIC (decl))
1682 /* Templates are allowed to have internal linkage. See
1686 comdat_linkage (decl);
1690 DECL_EXTERNAL (decl) = 1;
1691 DECL_NOT_REALLY_EXTERN (decl) = 0;
1694 else if (DECL_FUNCTION_MEMBER_P (decl))
1696 if (!DECL_DECLARED_INLINE_P (decl))
1698 tree ctype = DECL_CONTEXT (decl);
1699 import_export_class (ctype);
1700 if (CLASSTYPE_INTERFACE_KNOWN (ctype))
1702 DECL_NOT_REALLY_EXTERN (decl)
1703 = ! (CLASSTYPE_INTERFACE_ONLY (ctype)
1704 || (DECL_DECLARED_INLINE_P (decl)
1705 && ! flag_implement_inlines
1706 && !DECL_VINDEX (decl)));
1708 if (!DECL_NOT_REALLY_EXTERN (decl))
1709 DECL_EXTERNAL (decl) = 1;
1711 /* Always make artificials weak. */
1712 if (DECL_ARTIFICIAL (decl) && flag_weak)
1713 comdat_linkage (decl);
1715 maybe_make_one_only (decl);
1719 comdat_linkage (decl);
1722 comdat_linkage (decl);
1724 DECL_INTERFACE_KNOWN (decl) = 1;
1727 /* Here, we only decide whether or not the tinfo node should be
1728 emitted with the vtable. IS_IN_LIBRARY is nonzero iff the
1729 typeinfo for TYPE should be in the runtime library. */
1732 import_export_tinfo (tree decl, tree type, bool is_in_library)
1734 if (DECL_INTERFACE_KNOWN (decl))
1737 if (IS_AGGR_TYPE (type))
1738 import_export_class (type);
1740 if (IS_AGGR_TYPE (type) && CLASSTYPE_INTERFACE_KNOWN (type)
1741 && TYPE_POLYMORPHIC_P (type)
1742 /* If -fno-rtti, we're not necessarily emitting this stuff with
1743 the class, so go ahead and emit it now. This can happen when
1744 a class is used in exception handling. */
1747 DECL_NOT_REALLY_EXTERN (decl) = !CLASSTYPE_INTERFACE_ONLY (type);
1748 DECL_COMDAT (decl) = 0;
1752 DECL_NOT_REALLY_EXTERN (decl) = 1;
1753 DECL_COMDAT (decl) = 1;
1756 /* Now override some cases. */
1758 DECL_COMDAT (decl) = 1;
1759 else if (is_in_library)
1760 DECL_COMDAT (decl) = 0;
1762 DECL_INTERFACE_KNOWN (decl) = 1;
1765 /* Return an expression that performs the destruction of DECL, which
1766 must be a VAR_DECL whose type has a non-trivial destructor, or is
1767 an array whose (innermost) elements have a non-trivial destructor. */
1770 build_cleanup (tree decl)
1773 tree type = TREE_TYPE (decl);
1775 /* This function should only be called for declarations that really
1776 require cleanups. */
1777 my_friendly_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type), 20030106);
1779 /* Treat all objects with destructors as used; the destructor may do
1780 something substantive. */
1783 if (TREE_CODE (type) == ARRAY_TYPE)
1787 cxx_mark_addressable (decl);
1788 temp = build1 (ADDR_EXPR, build_pointer_type (type), decl);
1790 temp = build_delete (TREE_TYPE (temp), temp,
1791 sfk_complete_destructor,
1792 LOOKUP_NORMAL|LOOKUP_NONVIRTUAL|LOOKUP_DESTRUCTOR, 0);
1796 /* Returns the initialization guard variable for the variable DECL,
1797 which has static storage duration. */
1800 get_guard (tree decl)
1805 sname = mangle_guard_variable (decl);
1806 guard = IDENTIFIER_GLOBAL_VALUE (sname);
1811 /* We use a type that is big enough to contain a mutex as well
1812 as an integer counter. */
1813 guard_type = targetm.cxx.guard_type ();
1814 guard = build_decl (VAR_DECL, sname, guard_type);
1816 /* The guard should have the same linkage as what it guards. */
1817 TREE_PUBLIC (guard) = TREE_PUBLIC (decl);
1818 TREE_STATIC (guard) = TREE_STATIC (decl);
1819 DECL_COMMON (guard) = DECL_COMMON (decl);
1820 DECL_ONE_ONLY (guard) = DECL_ONE_ONLY (decl);
1821 if (TREE_PUBLIC (decl))
1822 DECL_WEAK (guard) = DECL_WEAK (decl);
1824 DECL_ARTIFICIAL (guard) = 1;
1825 TREE_USED (guard) = 1;
1826 pushdecl_top_level_and_finish (guard, NULL_TREE);
1831 /* Return those bits of the GUARD variable that should be set when the
1832 guarded entity is actually initialized. */
1835 get_guard_bits (tree guard)
1837 if (!targetm.cxx.guard_mask_bit ())
1839 /* We only set the first byte of the guard, in order to leave room
1840 for a mutex in the high-order bits. */
1841 guard = build1 (ADDR_EXPR,
1842 build_pointer_type (TREE_TYPE (guard)),
1844 guard = build1 (NOP_EXPR,
1845 build_pointer_type (char_type_node),
1847 guard = build1 (INDIRECT_REF, char_type_node, guard);
1853 /* Return an expression which determines whether or not the GUARD
1854 variable has already been initialized. */
1857 get_guard_cond (tree guard)
1861 /* Check to see if the GUARD is zero. */
1862 guard = get_guard_bits (guard);
1864 /* Mask off all but the low bit. */
1865 if (targetm.cxx.guard_mask_bit ())
1867 guard_value = integer_one_node;
1868 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
1869 guard_value = convert (TREE_TYPE (guard), guard_value);
1870 guard = cp_build_binary_op (BIT_AND_EXPR, guard, guard_value);
1873 guard_value = integer_zero_node;
1874 if (!same_type_p (TREE_TYPE (guard_value), TREE_TYPE (guard)))
1875 guard_value = convert (TREE_TYPE (guard), guard_value);
1876 return cp_build_binary_op (EQ_EXPR, guard, guard_value);
1879 /* Return an expression which sets the GUARD variable, indicating that
1880 the variable being guarded has been initialized. */
1883 set_guard (tree guard)
1887 /* Set the GUARD to one. */
1888 guard = get_guard_bits (guard);
1889 guard_init = integer_one_node;
1890 if (!same_type_p (TREE_TYPE (guard_init), TREE_TYPE (guard)))
1891 guard_init = convert (TREE_TYPE (guard), guard_init);
1892 return build_modify_expr (guard, NOP_EXPR, guard_init);
1895 /* Start the process of running a particular set of global constructors
1896 or destructors. Subroutine of do_[cd]tors. */
1899 start_objects (int method_type, int initp)
1905 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
1907 if (initp != DEFAULT_INIT_PRIORITY)
1917 sprintf (type, "%c%c%.5u", method_type, joiner, initp);
1920 sprintf (type, "%c", method_type);
1922 fndecl = build_lang_decl (FUNCTION_DECL,
1923 get_file_function_name_long (type),
1924 build_function_type (void_type_node,
1926 start_preparsed_function (fndecl, /*attrs=*/NULL_TREE, SF_PRE_PARSED);
1928 /* It can be a static function as long as collect2 does not have
1929 to scan the object file to find its ctor/dtor routine. */
1930 TREE_PUBLIC (current_function_decl) = ! targetm.have_ctors_dtors;
1932 /* Mark this declaration as used to avoid spurious warnings. */
1933 TREE_USED (current_function_decl) = 1;
1935 /* Mark this function as a global constructor or destructor. */
1936 if (method_type == 'I')
1937 DECL_GLOBAL_CTOR_P (current_function_decl) = 1;
1939 DECL_GLOBAL_DTOR_P (current_function_decl) = 1;
1940 DECL_LANG_SPECIFIC (current_function_decl)->decl_flags.u2sel = 1;
1942 body = begin_compound_stmt (BCS_FN_BODY);
1944 /* We cannot allow these functions to be elided, even if they do not
1945 have external linkage. And, there's no point in deferring
1946 compilation of thes functions; they're all going to have to be
1948 DECL_INLINE (current_function_decl) = 0;
1949 DECL_UNINLINABLE (current_function_decl) = 1;
1954 /* Finish the process of running a particular set of global constructors
1955 or destructors. Subroutine of do_[cd]tors. */
1958 finish_objects (int method_type, int initp, tree body)
1963 finish_compound_stmt (body);
1964 fn = finish_function (0);
1965 expand_or_defer_fn (fn);
1967 /* When only doing semantic analysis, and no RTL generation, we
1968 can't call functions that directly emit assembly code; there is
1969 no assembly file in which to put the code. */
1970 if (flag_syntax_only)
1973 if (targetm.have_ctors_dtors)
1975 rtx fnsym = XEXP (DECL_RTL (fn), 0);
1976 if (method_type == 'I')
1977 (* targetm.asm_out.constructor) (fnsym, initp);
1979 (* targetm.asm_out.destructor) (fnsym, initp);
1983 /* The names of the parameters to the function created to handle
1984 initializations and destructions for objects with static storage
1986 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
1987 #define PRIORITY_IDENTIFIER "__priority"
1989 /* The name of the function we create to handle initializations and
1990 destructions for objects with static storage duration. */
1991 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
1993 /* The declaration for the __INITIALIZE_P argument. */
1994 static GTY(()) tree initialize_p_decl;
1996 /* The declaration for the __PRIORITY argument. */
1997 static GTY(()) tree priority_decl;
1999 /* The declaration for the static storage duration function. */
2000 static GTY(()) tree ssdf_decl;
2002 /* All the static storage duration functions created in this
2003 translation unit. */
2004 static GTY(()) varray_type ssdf_decls;
2006 /* A map from priority levels to information about that priority
2007 level. There may be many such levels, so efficient lookup is
2009 static splay_tree priority_info_map;
2011 /* Begins the generation of the function that will handle all
2012 initialization and destruction of objects with static storage
2013 duration. The function generated takes two parameters of type
2014 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2015 nonzero, it performs initializations. Otherwise, it performs
2016 destructions. It only performs those initializations or
2017 destructions with the indicated __PRIORITY. The generated function
2020 It is assumed that this function will only be called once per
2021 translation unit. */
2024 start_static_storage_duration_function (unsigned count)
2029 char id[sizeof (SSDF_IDENTIFIER) + 1 /* '\0' */ + 32];
2031 /* Create the identifier for this function. It will be of the form
2032 SSDF_IDENTIFIER_<number>. */
2033 sprintf (id, "%s_%u", SSDF_IDENTIFIER, count);
2035 /* Create the parameters. */
2036 parm_types = void_list_node;
2037 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2038 parm_types = tree_cons (NULL_TREE, integer_type_node, parm_types);
2039 type = build_function_type (void_type_node, parm_types);
2041 /* Create the FUNCTION_DECL itself. */
2042 ssdf_decl = build_lang_decl (FUNCTION_DECL,
2043 get_identifier (id),
2045 TREE_PUBLIC (ssdf_decl) = 0;
2046 DECL_ARTIFICIAL (ssdf_decl) = 1;
2048 /* Put this function in the list of functions to be called from the
2049 static constructors and destructors. */
2052 VARRAY_TREE_INIT (ssdf_decls, 32, "ssdf_decls");
2054 /* Take this opportunity to initialize the map from priority
2055 numbers to information about that priority level. */
2056 priority_info_map = splay_tree_new (splay_tree_compare_ints,
2057 /*delete_key_fn=*/0,
2058 /*delete_value_fn=*/
2059 (splay_tree_delete_value_fn) &free);
2061 /* We always need to generate functions for the
2062 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2063 priorities later, we'll be sure to find the
2064 DEFAULT_INIT_PRIORITY. */
2065 get_priority_info (DEFAULT_INIT_PRIORITY);
2068 VARRAY_PUSH_TREE (ssdf_decls, ssdf_decl);
2070 /* Create the argument list. */
2071 initialize_p_decl = cp_build_parm_decl
2072 (get_identifier (INITIALIZE_P_IDENTIFIER), integer_type_node);
2073 DECL_CONTEXT (initialize_p_decl) = ssdf_decl;
2074 TREE_USED (initialize_p_decl) = 1;
2075 priority_decl = cp_build_parm_decl
2076 (get_identifier (PRIORITY_IDENTIFIER), integer_type_node);
2077 DECL_CONTEXT (priority_decl) = ssdf_decl;
2078 TREE_USED (priority_decl) = 1;
2080 TREE_CHAIN (initialize_p_decl) = priority_decl;
2081 DECL_ARGUMENTS (ssdf_decl) = initialize_p_decl;
2083 /* Put the function in the global scope. */
2084 pushdecl (ssdf_decl);
2086 /* Start the function itself. This is equivalent to declaring the
2089 static void __ssdf (int __initialize_p, init __priority_p);
2091 It is static because we only need to call this function from the
2092 various constructor and destructor functions for this module. */
2093 start_preparsed_function (ssdf_decl,
2094 /*attrs=*/NULL_TREE,
2097 /* Set up the scope of the outermost block in the function. */
2098 body = begin_compound_stmt (BCS_FN_BODY);
2100 /* This function must not be deferred because we are depending on
2101 its compilation to tell us what is TREE_SYMBOL_REFERENCED. */
2102 DECL_INLINE (ssdf_decl) = 0;
2103 DECL_UNINLINABLE (ssdf_decl) = 1;
2108 /* Finish the generation of the function which performs initialization
2109 and destruction of objects with static storage duration. After
2110 this point, no more such objects can be created. */
2113 finish_static_storage_duration_function (tree body)
2115 /* Close out the function. */
2116 finish_compound_stmt (body);
2117 expand_or_defer_fn (finish_function (0));
2120 /* Return the information about the indicated PRIORITY level. If no
2121 code to handle this level has yet been generated, generate the
2122 appropriate prologue. */
2124 static priority_info
2125 get_priority_info (int priority)
2130 n = splay_tree_lookup (priority_info_map,
2131 (splay_tree_key) priority);
2134 /* Create a new priority information structure, and insert it
2136 pi = xmalloc (sizeof (struct priority_info_s));
2137 pi->initializations_p = 0;
2138 pi->destructions_p = 0;
2139 splay_tree_insert (priority_info_map,
2140 (splay_tree_key) priority,
2141 (splay_tree_value) pi);
2144 pi = (priority_info) n->value;
2149 /* Set up to handle the initialization or destruction of DECL. If
2150 INITP is nonzero, we are initializing the variable. Otherwise, we
2151 are destroying it. */
2154 start_static_initialization_or_destruction (tree decl, int initp)
2156 tree guard_if_stmt = NULL_TREE;
2163 /* Figure out the priority for this declaration. */
2164 priority = DECL_INIT_PRIORITY (decl);
2166 priority = DEFAULT_INIT_PRIORITY;
2168 /* Remember that we had an initialization or finalization at this
2170 pi = get_priority_info (priority);
2172 pi->initializations_p = 1;
2174 pi->destructions_p = 1;
2176 /* Trick the compiler into thinking we are at the file and line
2177 where DECL was declared so that error-messages make sense, and so
2178 that the debugger will show somewhat sensible file and line
2180 input_location = DECL_SOURCE_LOCATION (decl);
2186 Access control for implicit calls to the constructors,
2187 the conversion functions, or the destructor called to
2188 create and destroy a static data member is performed as
2189 if these calls appeared in the scope of the member's
2192 we pretend we are in a static member function of the class of
2193 which the DECL is a member. */
2194 if (member_p (decl))
2196 DECL_CONTEXT (current_function_decl) = DECL_CONTEXT (decl);
2197 DECL_STATIC_FUNCTION_P (current_function_decl) = 1;
2200 /* Conditionalize this initialization on being in the right priority
2201 and being initializing/finalizing appropriately. */
2202 guard_if_stmt = begin_if_stmt ();
2203 cond = cp_build_binary_op (EQ_EXPR,
2205 build_int_2 (priority, 0));
2206 init_cond = initp ? integer_one_node : integer_zero_node;
2207 init_cond = cp_build_binary_op (EQ_EXPR,
2210 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, init_cond);
2212 /* Assume we don't need a guard. */
2214 /* We need a guard if this is an object with external linkage that
2215 might be initialized in more than one place. (For example, a
2216 static data member of a template, when the data member requires
2218 if (TREE_PUBLIC (decl) && (DECL_COMMON (decl)
2219 || DECL_ONE_ONLY (decl)
2220 || DECL_WEAK (decl)))
2224 guard = get_guard (decl);
2226 /* When using __cxa_atexit, we just check the GUARD as we would
2227 for a local static. */
2228 if (flag_use_cxa_atexit)
2230 /* When using __cxa_atexit, we never try to destroy
2231 anything from a static destructor. */
2232 my_friendly_assert (initp, 20000629);
2233 guard_cond = get_guard_cond (guard);
2235 /* If we don't have __cxa_atexit, then we will be running
2236 destructors from .fini sections, or their equivalents. So,
2237 we need to know how many times we've tried to initialize this
2238 object. We do initializations only if the GUARD is zero,
2239 i.e., if we are the first to initialize the variable. We do
2240 destructions only if the GUARD is one, i.e., if we are the
2241 last to destroy the variable. */
2244 = cp_build_binary_op (EQ_EXPR,
2245 build_unary_op (PREINCREMENT_EXPR,
2251 = cp_build_binary_op (EQ_EXPR,
2252 build_unary_op (PREDECREMENT_EXPR,
2257 cond = cp_build_binary_op (TRUTH_ANDIF_EXPR, cond, guard_cond);
2260 finish_if_stmt_cond (cond, guard_if_stmt);
2262 /* If we're using __cxa_atexit, we have not already set the GUARD,
2263 so we must do so now. */
2264 if (guard && initp && flag_use_cxa_atexit)
2265 finish_expr_stmt (set_guard (guard));
2267 return guard_if_stmt;
2270 /* We've just finished generating code to do an initialization or
2271 finalization. GUARD_IF_STMT is the if-statement we used to guard
2272 the initialization. */
2275 finish_static_initialization_or_destruction (tree guard_if_stmt)
2277 finish_then_clause (guard_if_stmt);
2278 finish_if_stmt (guard_if_stmt);
2280 /* Now that we're done with DECL we don't need to pretend to be a
2281 member of its class any longer. */
2282 DECL_CONTEXT (current_function_decl) = NULL_TREE;
2283 DECL_STATIC_FUNCTION_P (current_function_decl) = 0;
2286 /* Generate code to do the initialization of DECL, a VAR_DECL with
2287 static storage duration. The initialization is INIT. */
2290 do_static_initialization (tree decl, tree init)
2294 /* Set up for the initialization. */
2296 = start_static_initialization_or_destruction (decl,
2299 /* Perform the initialization. */
2301 finish_expr_stmt (init);
2303 /* If we're using __cxa_atexit, register a a function that calls the
2304 destructor for the object. */
2305 if (flag_use_cxa_atexit)
2306 register_dtor_fn (decl);
2309 finish_static_initialization_or_destruction (guard_if_stmt);
2312 /* Generate code to do the static destruction of DECL. If DECL may be
2313 initialized more than once in different object files, GUARD is the
2314 guard variable to check. PRIORITY is the priority for the
2318 do_static_destruction (tree decl)
2322 /* If we're using __cxa_atexit, then destructors are registered
2323 immediately after objects are initialized. */
2324 my_friendly_assert (!flag_use_cxa_atexit, 20000121);
2326 /* If we don't need a destructor, there's nothing to do. */
2327 if (TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl)))
2330 /* Actually do the destruction. */
2331 guard_if_stmt = start_static_initialization_or_destruction (decl,
2333 finish_expr_stmt (build_cleanup (decl));
2334 finish_static_initialization_or_destruction (guard_if_stmt);
2337 /* VARS is a list of variables with static storage duration which may
2338 need initialization and/or finalization. Remove those variables
2339 that don't really need to be initialized or finalized, and return
2340 the resulting list. The order in which the variables appear in
2341 VARS is in reverse order of the order in which they should actually
2342 be initialized. The list we return is in the unreversed order;
2343 i.e., the first variable should be initialized first. */
2346 prune_vars_needing_no_initialization (tree *vars)
2349 tree result = NULL_TREE;
2354 tree decl = TREE_VALUE (t);
2355 tree init = TREE_PURPOSE (t);
2357 /* Deal gracefully with error. */
2358 if (decl == error_mark_node)
2360 var = &TREE_CHAIN (t);
2364 /* The only things that can be initialized are variables. */
2365 my_friendly_assert (TREE_CODE (decl) == VAR_DECL, 19990420);
2367 /* If this object is not defined, we don't need to do anything
2369 if (DECL_EXTERNAL (decl))
2371 var = &TREE_CHAIN (t);
2375 /* Also, if the initializer already contains errors, we can bail
2377 if (init && TREE_CODE (init) == TREE_LIST
2378 && value_member (error_mark_node, init))
2380 var = &TREE_CHAIN (t);
2384 /* This variable is going to need initialization and/or
2385 finalization, so we add it to the list. */
2386 *var = TREE_CHAIN (t);
2387 TREE_CHAIN (t) = result;
2394 /* Make sure we have told the back end about all the variables in
2398 write_out_vars (tree vars)
2402 for (v = vars; v; v = TREE_CHAIN (v))
2403 if (!var_finalized_p (TREE_VALUE (v)))
2404 rest_of_decl_compilation (TREE_VALUE (v), 0, 1, 1);
2407 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
2408 (otherwise) that will initialize all gobal objects with static
2409 storage duration having the indicated PRIORITY. */
2412 generate_ctor_or_dtor_function (bool constructor_p, int priority,
2421 input_location = *locus;
2422 #ifdef USE_MAPPED_LOCATION
2428 /* We use `I' to indicate initialization and `D' to indicate
2430 function_key = constructor_p ? 'I' : 'D';
2432 /* We emit the function lazily, to avoid generating empty
2433 global constructors and destructors. */
2436 /* Call the static storage duration function with appropriate
2439 for (i = 0; i < ssdf_decls->elements_used; ++i)
2441 fndecl = VARRAY_TREE (ssdf_decls, i);
2443 /* Calls to pure or const functions will expand to nothing. */
2444 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2447 body = start_objects (function_key, priority);
2449 arguments = tree_cons (NULL_TREE, build_int_2 (priority, 0),
2451 arguments = tree_cons (NULL_TREE, build_int_2 (constructor_p, 0),
2453 finish_expr_stmt (build_function_call (fndecl, arguments));
2457 /* If we're generating code for the DEFAULT_INIT_PRIORITY, throw in
2458 calls to any functions marked with attributes indicating that
2459 they should be called at initialization- or destruction-time. */
2460 if (priority == DEFAULT_INIT_PRIORITY)
2464 for (fns = constructor_p ? static_ctors : static_dtors;
2466 fns = TREE_CHAIN (fns))
2468 fndecl = TREE_VALUE (fns);
2470 /* Calls to pure/const functions will expand to nothing. */
2471 if (! (flags_from_decl_or_type (fndecl) & (ECF_CONST | ECF_PURE)))
2474 body = start_objects (function_key, priority);
2475 finish_expr_stmt (build_function_call (fndecl, NULL_TREE));
2480 /* Close out the function. */
2482 finish_objects (function_key, priority, body);
2485 /* Generate constructor and destructor functions for the priority
2489 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n, void * data)
2491 location_t *locus = data;
2492 int priority = (int) n->key;
2493 priority_info pi = (priority_info) n->value;
2495 /* Generate the functions themselves, but only if they are really
2497 if (pi->initializations_p
2498 || (priority == DEFAULT_INIT_PRIORITY && static_ctors))
2499 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority, locus);
2500 if (pi->destructions_p
2501 || (priority == DEFAULT_INIT_PRIORITY && static_dtors))
2502 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority, locus);
2504 /* Keep iterating. */
2508 /* Called via LANGHOOK_CALLGRAPH_ANALYZE_EXPR. It is supposed to mark
2509 decls referenced from frontend specific constructs; it will be called
2510 only for language-specific tree nodes.
2512 Here we must deal with member pointers. */
2515 cxx_callgraph_analyze_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
2516 tree from ATTRIBUTE_UNUSED)
2520 if (flag_unit_at_a_time)
2521 switch (TREE_CODE (t))
2524 if (TYPE_PTRMEMFUNC_P (TREE_TYPE (t)))
2525 cgraph_mark_needed_node (cgraph_node (PTRMEM_CST_MEMBER (t)));
2528 if (TREE_CODE (BASELINK_FUNCTIONS (t)) == FUNCTION_DECL)
2529 cgraph_mark_needed_node (cgraph_node (BASELINK_FUNCTIONS (t)));
2539 /* This routine is called from the last rule in yyparse ().
2540 Its job is to create all the code needed to initialize and
2541 destroy the global aggregates. We do the destruction
2542 first, since that way we only need to reverse the decls once. */
2551 unsigned ssdf_count = 0;
2553 locus = input_location;
2556 /* Bad parse errors. Just forget about it. */
2557 if (! global_bindings_p () || current_class_type || decl_namespace_list)
2561 c_common_write_pch ();
2563 #ifdef USE_MAPPED_LOCATION
2566 /* Otherwise, GDB can get confused, because in only knows
2567 about source for LINENO-1 lines. */
2571 interface_unknown = 1;
2574 /* We now have to write out all the stuff we put off writing out.
2577 o Template specializations that we have not yet instantiated,
2578 but which are needed.
2579 o Initialization and destruction for non-local objects with
2580 static storage duration. (Local objects with static storage
2581 duration are initialized when their scope is first entered,
2582 and are cleaned up via atexit.)
2583 o Virtual function tables.
2585 All of these may cause others to be needed. For example,
2586 instantiating one function may cause another to be needed, and
2587 generating the initializer for an object may cause templates to be
2588 instantiated, etc., etc. */
2590 timevar_push (TV_VARCONST);
2592 emit_support_tinfos ();
2597 size_t n_old, n_new;
2601 /* If there are templates that we've put off instantiating, do
2603 instantiate_pending_templates ();
2606 /* Write out virtual tables as required. Note that writing out
2607 the virtual table for a template class may cause the
2608 instantiation of members of that class. If we write out
2609 vtables then we remove the class from our list so we don't
2610 have to look at it again. */
2612 while (keyed_classes != NULL_TREE
2613 && maybe_emit_vtables (TREE_VALUE (keyed_classes)))
2616 keyed_classes = TREE_CHAIN (keyed_classes);
2622 tree next = TREE_CHAIN (t);
2626 if (maybe_emit_vtables (TREE_VALUE (next)))
2629 TREE_CHAIN (t) = TREE_CHAIN (next);
2634 next = TREE_CHAIN (t);
2638 /* Write out needed type info variables. We have to be careful
2639 looping through unemitted decls, because emit_tinfo_decl may
2640 cause other variables to be needed. We stick new elements
2641 (and old elements that we may need to reconsider) at the end
2642 of the array, then shift them back to the beginning once we're
2645 n_old = VARRAY_ACTIVE_SIZE (unemitted_tinfo_decls);
2646 for (i = 0; i < n_old; ++i)
2648 tree tinfo_decl = VARRAY_TREE (unemitted_tinfo_decls, i);
2649 if (emit_tinfo_decl (tinfo_decl))
2652 VARRAY_PUSH_TREE (unemitted_tinfo_decls, tinfo_decl);
2655 /* The only elements we want to keep are the new ones. Copy
2656 them to the beginning of the array, then get rid of the
2658 n_new = VARRAY_ACTIVE_SIZE (unemitted_tinfo_decls) - n_old;
2660 memmove (&VARRAY_TREE (unemitted_tinfo_decls, 0),
2661 &VARRAY_TREE (unemitted_tinfo_decls, n_old),
2662 n_new * sizeof (tree));
2663 memset (&VARRAY_TREE (unemitted_tinfo_decls, n_new),
2664 0, n_old * sizeof (tree));
2665 VARRAY_ACTIVE_SIZE (unemitted_tinfo_decls) = n_new;
2667 /* The list of objects with static storage duration is built up
2668 in reverse order. We clear STATIC_AGGREGATES so that any new
2669 aggregates added during the initialization of these will be
2670 initialized in the correct order when we next come around the
2672 vars = prune_vars_needing_no_initialization (&static_aggregates);
2678 /* We need to start a new initialization function each time
2679 through the loop. That's because we need to know which
2680 vtables have been referenced, and TREE_SYMBOL_REFERENCED
2681 isn't computed until a function is finished, and written
2682 out. That's a deficiency in the back-end. When this is
2683 fixed, these initialization functions could all become
2684 inline, with resulting performance improvements. */
2687 /* Set the line and file, so that it is obviously not from
2689 input_location = locus;
2690 ssdf_body = start_static_storage_duration_function (ssdf_count);
2692 /* Make sure the back end knows about all the variables. */
2693 write_out_vars (vars);
2695 /* First generate code to do all the initializations. */
2696 for (v = vars; v; v = TREE_CHAIN (v))
2697 do_static_initialization (TREE_VALUE (v),
2700 /* Then, generate code to do all the destructions. Do these
2701 in reverse order so that the most recently constructed
2702 variable is the first destroyed. If we're using
2703 __cxa_atexit, then we don't need to do this; functions
2704 were registered at initialization time to destroy the
2706 if (!flag_use_cxa_atexit)
2708 vars = nreverse (vars);
2709 for (v = vars; v; v = TREE_CHAIN (v))
2710 do_static_destruction (TREE_VALUE (v));
2715 /* Finish up the static storage duration function for this
2717 input_location = locus;
2718 finish_static_storage_duration_function (ssdf_body);
2720 /* All those initializations and finalizations might cause
2721 us to need more inline functions, more template
2722 instantiations, etc. */
2725 #ifdef USE_MAPPED_LOCATION
2732 for (i = 0; i < deferred_fns_used; ++i)
2734 tree decl = VARRAY_TREE (deferred_fns, i);
2736 if (! DECL_DECLARED_INLINE_P (decl) || ! TREE_USED (decl))
2739 /* Does it need synthesizing? */
2740 if (DECL_ARTIFICIAL (decl) && ! DECL_INITIAL (decl)
2742 && (! DECL_REALLY_EXTERN (decl) || DECL_INLINE (decl)))
2744 /* Even though we're already at the top-level, we push
2745 there again. That way, when we pop back a few lines
2746 hence, all of our state is restored. Otherwise,
2747 finish_function doesn't clean things up, and we end
2748 up with CURRENT_FUNCTION_DECL set. */
2749 push_to_top_level ();
2750 synthesize_method (decl);
2751 pop_from_top_level ();
2755 if (!DECL_SAVED_TREE (decl))
2758 import_export_decl (decl);
2760 /* We lie to the back-end, pretending that some functions
2761 are not defined when they really are. This keeps these
2762 functions from being put out unnecessarily. But, we must
2763 stop lying when the functions are referenced, or if they
2764 are not comdat since they need to be put out now. This
2765 is done in a separate for cycle, because if some deferred
2766 function is contained in another deferred function later
2767 in deferred_fns varray, rest_of_compilation would skip
2768 this function and we really cannot expand the same
2770 if (DECL_NOT_REALLY_EXTERN (decl)
2771 && DECL_INITIAL (decl)
2772 && DECL_NEEDED_P (decl))
2773 DECL_EXTERNAL (decl) = 0;
2775 /* If we're going to need to write this function out, and
2776 there's already a body for it, create RTL for it now.
2777 (There might be no body if this is a method we haven't
2778 gotten around to synthesizing yet.) */
2779 if (!DECL_EXTERNAL (decl)
2780 && DECL_NEEDED_P (decl)
2781 && !TREE_ASM_WRITTEN (decl)
2782 && (!flag_unit_at_a_time
2783 || !cgraph_node (decl)->local.finalized))
2785 /* We will output the function; no longer consider it in this
2787 DECL_DEFER_OUTPUT (decl) = 0;
2788 /* Generate RTL for this function now that we know we
2790 expand_or_defer_fn (decl);
2791 /* If we're compiling -fsyntax-only pretend that this
2792 function has been written out so that we don't try to
2794 if (flag_syntax_only)
2795 TREE_ASM_WRITTEN (decl) = 1;
2800 if (walk_namespaces (wrapup_globals_for_namespace, /*data=*/0))
2803 /* Static data members are just like namespace-scope globals. */
2804 for (i = 0; i < pending_statics_used; ++i)
2806 tree decl = VARRAY_TREE (pending_statics, i);
2807 if (var_finalized_p (decl))
2809 import_export_decl (decl);
2810 if (DECL_NOT_REALLY_EXTERN (decl) && ! DECL_IN_AGGR_P (decl))
2811 DECL_EXTERNAL (decl) = 0;
2814 && wrapup_global_declarations (&VARRAY_TREE (pending_statics, 0),
2815 pending_statics_used))
2818 if (cgraph_assemble_pending_functions ())
2823 /* All used inline functions must have a definition at this point. */
2824 for (i = 0; i < deferred_fns_used; ++i)
2826 tree decl = VARRAY_TREE (deferred_fns, i);
2828 if (!TREE_ASM_WRITTEN (decl) && !DECL_SAVED_TREE (decl)
2829 /* An explicit instantiation can be used to specify
2830 that the body is in another unit. It will have
2831 already verified there was a definition. */
2832 && !DECL_EXPLICIT_INSTANTIATION (decl))
2834 cp_warning_at ("inline function `%D' used but never defined", decl);
2835 /* This symbol is effectively an "extern" declaration now.
2836 This is not strictly necessary, but removes a duplicate
2838 TREE_PUBLIC (decl) = 1;
2843 /* We give C linkage to static constructors and destructors. */
2844 push_lang_context (lang_name_c);
2846 /* Generate initialization and destruction functions for all
2847 priorities for which they are required. */
2848 if (priority_info_map)
2849 splay_tree_foreach (priority_info_map,
2850 generate_ctor_and_dtor_functions_for_priority,
2856 generate_ctor_or_dtor_function (/*constructor_p=*/true,
2857 DEFAULT_INIT_PRIORITY, &locus);
2859 generate_ctor_or_dtor_function (/*constructor_p=*/false,
2860 DEFAULT_INIT_PRIORITY, &locus);
2863 /* We're done with the splay-tree now. */
2864 if (priority_info_map)
2865 splay_tree_delete (priority_info_map);
2867 /* We're done with static constructors, so we can go back to "C++"
2869 pop_lang_context ();
2871 if (flag_unit_at_a_time)
2873 cgraph_finalize_compilation_unit ();
2877 /* Emit mudflap static registration function. This must be done
2878 after all the user functions have been expanded. */
2880 mudflap_finish_file ();
2882 /* Now, issue warnings about static, but not defined, functions,
2883 etc., and emit debugging information. */
2884 walk_namespaces (wrapup_globals_for_namespace, /*data=*/&reconsider);
2885 if (pending_statics)
2886 check_global_declarations (&VARRAY_TREE (pending_statics, 0),
2887 pending_statics_used);
2891 /* The entire file is now complete. If requested, dump everything
2895 FILE *stream = dump_begin (TDI_tu, &flags);
2899 dump_node (global_namespace, flags & ~TDF_SLIM, stream);
2900 dump_end (TDI_tu, stream);
2904 timevar_pop (TV_VARCONST);
2906 if (flag_detailed_statistics)
2908 dump_tree_statistics ();
2909 dump_time_statistics ();
2911 input_location = locus;
2913 #ifdef ENABLE_CHECKING
2914 validate_conversion_obstack ();
2915 #endif /* ENABLE_CHECKING */
2918 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
2919 function to call in parse-tree form; it has not yet been
2920 semantically analyzed. ARGS are the arguments to the function.
2921 They have already been semantically analyzed. */
2924 build_offset_ref_call_from_tree (tree fn, tree args)
2933 object = TREE_OPERAND (fn, 0);
2935 if (processing_template_decl)
2937 my_friendly_assert (TREE_CODE (fn) == DOTSTAR_EXPR
2938 || TREE_CODE (fn) == MEMBER_REF,
2940 if (type_dependent_expression_p (fn)
2941 || any_type_dependent_arguments_p (args))
2942 return build_min_nt (CALL_EXPR, fn, args, NULL_TREE);
2944 /* Transform the arguments and add the implicit "this"
2945 parameter. That must be done before the FN is transformed
2946 because we depend on the form of FN. */
2947 args = build_non_dependent_args (args);
2948 if (TREE_CODE (fn) == DOTSTAR_EXPR)
2949 object = build_unary_op (ADDR_EXPR, object, 0);
2950 object = build_non_dependent_expr (object);
2951 args = tree_cons (NULL_TREE, object, args);
2952 /* Now that the arguments are done, transform FN. */
2953 fn = build_non_dependent_expr (fn);
2956 /* A qualified name corresponding to a bound pointer-to-member is
2957 represented as an OFFSET_REF:
2959 struct B { void g(); };
2961 void B::g() { (this->*p)(); } */
2962 if (TREE_CODE (fn) == OFFSET_REF)
2964 tree object_addr = build_unary_op (ADDR_EXPR, object, 0);
2965 fn = TREE_OPERAND (fn, 1);
2966 fn = get_member_function_from_ptrfunc (&object_addr, fn);
2967 args = tree_cons (NULL_TREE, object_addr, args);
2970 expr = build_function_call (fn, args);
2971 if (processing_template_decl && expr != error_mark_node)
2972 return build_min_non_dep (CALL_EXPR, expr, orig_fn, orig_args, NULL_TREE);
2978 check_default_args (tree x)
2980 tree arg = TYPE_ARG_TYPES (TREE_TYPE (x));
2981 bool saw_def = false;
2982 int i = 0 - (TREE_CODE (TREE_TYPE (x)) == METHOD_TYPE);
2983 for (; arg && arg != void_list_node; arg = TREE_CHAIN (arg), ++i)
2985 if (TREE_PURPOSE (arg))
2989 cp_error_at ("default argument missing for parameter %P of `%+#D'",
2997 mark_used (tree decl)
2999 TREE_USED (decl) = 1;
3000 if (processing_template_decl || skip_evaluation)
3003 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl)
3004 && !TREE_ASM_WRITTEN (decl))
3005 /* Remember it, so we can check it was defined. */
3007 if (DECL_DEFERRED_FN (decl))
3009 DECL_DEFERRED_FN (decl) = 1;
3010 DECL_DEFER_OUTPUT (decl) = 1;
3012 VARRAY_TREE_INIT (deferred_fns, 32, "deferred_fns");
3014 VARRAY_PUSH_TREE (deferred_fns, decl);
3017 assemble_external (decl);
3019 /* Is it a synthesized method that needs to be synthesized? */
3020 if (TREE_CODE (decl) == FUNCTION_DECL
3021 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
3022 && DECL_ARTIFICIAL (decl)
3023 && !DECL_THUNK_P (decl)
3024 && ! DECL_INITIAL (decl)
3025 /* Kludge: don't synthesize for default args. */
3026 && current_function_decl)
3028 synthesize_method (decl);
3029 /* If we've already synthesized the method we don't need to
3030 instantiate it, so we can return right away. */
3034 /* If this is a function or variable that is an instance of some
3035 template, we now know that we will need to actually do the
3036 instantiation. We check that DECL is not an explicit
3037 instantiation because that is not checked in instantiate_decl. */
3038 if ((DECL_NON_THUNK_FUNCTION_P (decl) || TREE_CODE (decl) == VAR_DECL)
3039 && DECL_LANG_SPECIFIC (decl) && DECL_TEMPLATE_INFO (decl)
3040 && (!DECL_EXPLICIT_INSTANTIATION (decl)
3041 || (TREE_CODE (decl) == FUNCTION_DECL
3042 && DECL_INLINE (DECL_TEMPLATE_RESULT
3043 (template_for_substitution (decl))))))
3047 /* Normally, we put off instantiating functions in order to
3048 improve compile times. Maintaining a stack of active
3049 functions is expensive, and the inliner knows to
3050 instantiate any functions it might need.
3052 However, if instantiating this function might help us mark
3053 the current function TREE_NOTHROW, we go ahead and
3056 This is not needed for unit-at-a-time since we reorder the functions
3057 in topological order anyway.
3059 defer = (!flag_exceptions
3060 || flag_unit_at_a_time
3062 || TREE_CODE (decl) != FUNCTION_DECL
3063 /* If the called function can't throw, we don't need to
3064 generate its body to find that out. */
3065 || TREE_NOTHROW (decl)
3067 || !current_function_decl
3068 /* If we already know the current function can't throw,
3069 then we don't need to work hard to prove it. */
3070 || TREE_NOTHROW (current_function_decl)
3071 /* If we already know that the current function *can*
3072 throw, there's no point in gathering more
3074 || cp_function_chain->can_throw);
3076 instantiate_decl (decl, defer, /*undefined_ok=*/0);
3080 #include "gt-cp-decl2.h"