1 /* Process declarations and variables for C++ compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010,
4 2011, 2012 Free Software Foundation, Inc.
5 Hacked by Michael Tiemann (tiemann@cygnus.com)
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
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"
44 #include "c-family/c-common.h"
45 #include "c-family/c-objc.h"
47 #include "tree-inline.h"
48 #include "c-family/c-pragma.h"
49 #include "tree-dump.h"
52 #include "pointer-set.h"
53 #include "splay-tree.h"
54 #include "langhooks.h"
55 #include "c-family/c-ada-spec.h"
57 extern cpp_reader
*parse_in
;
59 /* This structure contains information about the initializations
60 and/or destructions required for a particular priority level. */
61 typedef struct priority_info_s
{
62 /* Nonzero if there have been any initializations at this priority
63 throughout the translation unit. */
64 int initializations_p
;
65 /* Nonzero if there have been any destructions at this priority
66 throughout the translation unit. */
70 static void mark_vtable_entries (tree
);
71 static bool maybe_emit_vtables (tree
);
72 static bool acceptable_java_type (tree
);
73 static tree
start_objects (int, int);
74 static void finish_objects (int, int, tree
);
75 static tree
start_static_storage_duration_function (unsigned);
76 static void finish_static_storage_duration_function (tree
);
77 static priority_info
get_priority_info (int);
78 static void do_static_initialization_or_destruction (tree
, bool);
79 static void one_static_initialization_or_destruction (tree
, tree
, bool);
80 static void generate_ctor_or_dtor_function (bool, int, location_t
*);
81 static int generate_ctor_and_dtor_functions_for_priority (splay_tree_node
,
83 static tree
prune_vars_needing_no_initialization (tree
*);
84 static void write_out_vars (tree
);
85 static void import_export_class (tree
);
86 static tree
get_guard_bits (tree
);
87 static void determine_visibility_from_class (tree
, tree
);
88 static bool determine_hidden_inline (tree
);
89 static bool decl_defined_p (tree
);
91 /* A list of static class variables. This is needed, because a
92 static class variable can be declared inside the class without
93 an initializer, and then initialized, statically, outside the class. */
94 static GTY(()) VEC(tree
,gc
) *pending_statics
;
96 /* A list of functions which were declared inline, but which we
97 may need to emit outline anyway. */
98 static GTY(()) VEC(tree
,gc
) *deferred_fns
;
100 /* A list of decls that use types with no linkage, which we need to make
102 static GTY(()) VEC(tree
,gc
) *no_linkage_decls
;
104 /* Nonzero if we're done parsing and into end-of-file activities. */
110 /* Return a member function type (a METHOD_TYPE), given FNTYPE (a
111 FUNCTION_TYPE), CTYPE (class type), and QUALS (the cv-qualifiers
112 that apply to the function). */
115 build_memfn_type (tree fntype
, tree ctype
, cp_cv_quals quals
)
121 if (fntype
== error_mark_node
|| ctype
== error_mark_node
)
122 return error_mark_node
;
124 gcc_assert (TREE_CODE (fntype
) == FUNCTION_TYPE
125 || TREE_CODE (fntype
) == METHOD_TYPE
);
127 type_quals
= quals
& ~TYPE_QUAL_RESTRICT
;
128 ctype
= cp_build_qualified_type (ctype
, type_quals
);
129 raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
130 attrs
= TYPE_ATTRIBUTES (fntype
);
131 fntype
= build_method_type_directly (ctype
, TREE_TYPE (fntype
),
132 (TREE_CODE (fntype
) == METHOD_TYPE
133 ? TREE_CHAIN (TYPE_ARG_TYPES (fntype
))
134 : TYPE_ARG_TYPES (fntype
)));
136 fntype
= build_exception_variant (fntype
, raises
);
138 fntype
= cp_build_type_attribute_variant (fntype
, attrs
);
143 /* Return a variant of FNTYPE, a FUNCTION_TYPE or METHOD_TYPE, with its
144 return type changed to NEW_RET. */
147 change_return_type (tree new_ret
, tree fntype
)
150 tree args
= TYPE_ARG_TYPES (fntype
);
151 tree raises
= TYPE_RAISES_EXCEPTIONS (fntype
);
152 tree attrs
= TYPE_ATTRIBUTES (fntype
);
154 if (new_ret
== error_mark_node
)
157 if (same_type_p (new_ret
, TREE_TYPE (fntype
)))
160 if (TREE_CODE (fntype
) == FUNCTION_TYPE
)
162 newtype
= build_function_type (new_ret
, args
);
163 newtype
= apply_memfn_quals (newtype
, type_memfn_quals (fntype
));
166 newtype
= build_method_type_directly
167 (class_of_this_parm (fntype
), new_ret
, TREE_CHAIN (args
));
169 newtype
= build_exception_variant (newtype
, raises
);
171 newtype
= cp_build_type_attribute_variant (newtype
, attrs
);
176 /* Build a PARM_DECL with NAME and TYPE, and set DECL_ARG_TYPE
180 cp_build_parm_decl (tree name
, tree type
)
182 tree parm
= build_decl (input_location
,
183 PARM_DECL
, name
, type
);
184 /* DECL_ARG_TYPE is only used by the back end and the back end never
186 if (!processing_template_decl
)
187 DECL_ARG_TYPE (parm
) = type_passed_as (type
);
189 /* If the type is a pack expansion, then we have a function
191 if (type
&& TREE_CODE (type
) == TYPE_PACK_EXPANSION
)
192 FUNCTION_PARAMETER_PACK_P (parm
) = 1;
197 /* Returns a PARM_DECL for a parameter of the indicated TYPE, with the
201 build_artificial_parm (tree name
, tree type
)
203 tree parm
= cp_build_parm_decl (name
, type
);
204 DECL_ARTIFICIAL (parm
) = 1;
205 /* All our artificial parms are implicitly `const'; they cannot be
207 TREE_READONLY (parm
) = 1;
211 /* Constructors for types with virtual baseclasses need an "in-charge" flag
212 saying whether this constructor is responsible for initialization of
213 virtual baseclasses or not. All destructors also need this "in-charge"
214 flag, which additionally determines whether or not the destructor should
215 free the memory for the object.
217 This function adds the "in-charge" flag to member function FN if
218 appropriate. It is called from grokclassfn and tsubst.
219 FN must be either a constructor or destructor.
221 The in-charge flag follows the 'this' parameter, and is followed by the
222 VTT parm (if any), then the user-written parms. */
225 maybe_retrofit_in_chrg (tree fn
)
227 tree basetype
, arg_types
, parms
, parm
, fntype
;
229 /* If we've already add the in-charge parameter don't do it again. */
230 if (DECL_HAS_IN_CHARGE_PARM_P (fn
))
233 /* When processing templates we can't know, in general, whether or
234 not we're going to have virtual baseclasses. */
235 if (processing_template_decl
)
238 /* We don't need an in-charge parameter for constructors that don't
239 have virtual bases. */
240 if (DECL_CONSTRUCTOR_P (fn
)
241 && !CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
244 arg_types
= TYPE_ARG_TYPES (TREE_TYPE (fn
));
245 basetype
= TREE_TYPE (TREE_VALUE (arg_types
));
246 arg_types
= TREE_CHAIN (arg_types
);
248 parms
= DECL_CHAIN (DECL_ARGUMENTS (fn
));
250 /* If this is a subobject constructor or destructor, our caller will
251 pass us a pointer to our VTT. */
252 if (CLASSTYPE_VBASECLASSES (DECL_CONTEXT (fn
)))
254 parm
= build_artificial_parm (vtt_parm_identifier
, vtt_parm_type
);
256 /* First add it to DECL_ARGUMENTS between 'this' and the real args... */
257 DECL_CHAIN (parm
) = parms
;
260 /* ...and then to TYPE_ARG_TYPES. */
261 arg_types
= hash_tree_chain (vtt_parm_type
, arg_types
);
263 DECL_HAS_VTT_PARM_P (fn
) = 1;
266 /* Then add the in-charge parm (before the VTT parm). */
267 parm
= build_artificial_parm (in_charge_identifier
, integer_type_node
);
268 DECL_CHAIN (parm
) = parms
;
270 arg_types
= hash_tree_chain (integer_type_node
, arg_types
);
272 /* Insert our new parameter(s) into the list. */
273 DECL_CHAIN (DECL_ARGUMENTS (fn
)) = parms
;
275 /* And rebuild the function type. */
276 fntype
= build_method_type_directly (basetype
, TREE_TYPE (TREE_TYPE (fn
)),
278 if (TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)))
279 fntype
= build_exception_variant (fntype
,
280 TYPE_RAISES_EXCEPTIONS (TREE_TYPE (fn
)));
281 if (TYPE_ATTRIBUTES (TREE_TYPE (fn
)))
282 fntype
= (cp_build_type_attribute_variant
283 (fntype
, TYPE_ATTRIBUTES (TREE_TYPE (fn
))));
284 TREE_TYPE (fn
) = fntype
;
286 /* Now we've got the in-charge parameter. */
287 DECL_HAS_IN_CHARGE_PARM_P (fn
) = 1;
290 /* Classes overload their constituent function names automatically.
291 When a function name is declared in a record structure,
292 its name is changed to it overloaded name. Since names for
293 constructors and destructors can conflict, we place a leading
296 CNAME is the name of the class we are grokking for.
298 FUNCTION is a FUNCTION_DECL. It was created by `grokdeclarator'.
300 FLAGS contains bits saying what's special about today's
301 arguments. DTOR_FLAG == DESTRUCTOR.
303 If FUNCTION is a destructor, then we must add the `auto-delete' field
304 as a second parameter. There is some hair associated with the fact
305 that we must "declare" this variable in the manner consistent with the
306 way the rest of the arguments were declared.
308 QUALS are the qualifiers for the this pointer. */
311 grokclassfn (tree ctype
, tree function
, enum overload_flags flags
)
313 tree fn_name
= DECL_NAME (function
);
315 /* Even within an `extern "C"' block, members get C++ linkage. See
316 [dcl.link] for details. */
317 SET_DECL_LANGUAGE (function
, lang_cplusplus
);
319 if (fn_name
== NULL_TREE
)
321 error ("name missing for member function");
322 fn_name
= get_identifier ("<anonymous>");
323 DECL_NAME (function
) = fn_name
;
326 DECL_CONTEXT (function
) = ctype
;
328 if (flags
== DTOR_FLAG
)
329 DECL_DESTRUCTOR_P (function
) = 1;
331 if (flags
== DTOR_FLAG
|| DECL_CONSTRUCTOR_P (function
))
332 maybe_retrofit_in_chrg (function
);
335 /* Create an ARRAY_REF, checking for the user doing things backwards
339 grok_array_decl (location_t loc
, tree array_expr
, tree index_exp
)
343 tree orig_array_expr
= array_expr
;
344 tree orig_index_exp
= index_exp
;
346 if (error_operand_p (array_expr
) || error_operand_p (index_exp
))
347 return error_mark_node
;
349 if (processing_template_decl
)
351 if (type_dependent_expression_p (array_expr
)
352 || type_dependent_expression_p (index_exp
))
353 return build_min_nt_loc (loc
, ARRAY_REF
, array_expr
, index_exp
,
354 NULL_TREE
, NULL_TREE
);
355 array_expr
= build_non_dependent_expr (array_expr
);
356 index_exp
= build_non_dependent_expr (index_exp
);
359 type
= TREE_TYPE (array_expr
);
361 type
= non_reference (type
);
363 /* If they have an `operator[]', use that. */
364 if (MAYBE_CLASS_TYPE_P (type
) || MAYBE_CLASS_TYPE_P (TREE_TYPE (index_exp
)))
365 expr
= build_new_op (loc
, ARRAY_REF
, LOOKUP_NORMAL
, array_expr
, index_exp
,
366 NULL_TREE
, /*overload=*/NULL
, tf_warning_or_error
);
371 /* Otherwise, create an ARRAY_REF for a pointer or array type.
372 It is a little-known fact that, if `a' is an array and `i' is
373 an int, you can write `i[a]', which means the same thing as
375 if (TREE_CODE (type
) == ARRAY_TYPE
|| TREE_CODE (type
) == VECTOR_TYPE
)
378 p1
= build_expr_type_conversion (WANT_POINTER
, array_expr
, false);
380 if (TREE_CODE (TREE_TYPE (index_exp
)) == ARRAY_TYPE
)
383 p2
= build_expr_type_conversion (WANT_POINTER
, index_exp
, false);
385 i1
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, array_expr
,
387 i2
= build_expr_type_conversion (WANT_INT
| WANT_ENUM
, index_exp
,
390 if ((p1
&& i2
) && (i1
&& p2
))
391 error ("ambiguous conversion for array subscript");
394 array_expr
= p1
, index_exp
= i2
;
396 array_expr
= p2
, index_exp
= i1
;
399 error ("invalid types %<%T[%T]%> for array subscript",
400 type
, TREE_TYPE (index_exp
));
401 return error_mark_node
;
404 if (array_expr
== error_mark_node
|| index_exp
== error_mark_node
)
405 error ("ambiguous conversion for array subscript");
407 expr
= build_array_ref (input_location
, array_expr
, index_exp
);
409 if (processing_template_decl
&& expr
!= error_mark_node
)
410 return build_min_non_dep (ARRAY_REF
, expr
, orig_array_expr
, orig_index_exp
,
411 NULL_TREE
, NULL_TREE
);
415 /* Given the cast expression EXP, checking out its validity. Either return
416 an error_mark_node if there was an unavoidable error, return a cast to
417 void for trying to delete a pointer w/ the value 0, or return the
418 call to delete. If DOING_VEC is true, we handle things differently
419 for doing an array delete.
420 Implements ARM $5.3.4. This is called from the parser. */
423 delete_sanity (tree exp
, tree size
, bool doing_vec
, int use_global_delete
,
424 tsubst_flags_t complain
)
428 if (exp
== error_mark_node
)
431 if (processing_template_decl
)
433 t
= build_min (DELETE_EXPR
, void_type_node
, exp
, size
);
434 DELETE_EXPR_USE_GLOBAL (t
) = use_global_delete
;
435 DELETE_EXPR_USE_VEC (t
) = doing_vec
;
436 TREE_SIDE_EFFECTS (t
) = 1;
440 /* An array can't have been allocated by new, so complain. */
441 if (TREE_CODE (exp
) == VAR_DECL
442 && TREE_CODE (TREE_TYPE (exp
)) == ARRAY_TYPE
)
443 warning (0, "deleting array %q#D", exp
);
445 t
= build_expr_type_conversion (WANT_POINTER
, exp
, true);
447 if (t
== NULL_TREE
|| t
== error_mark_node
)
449 error ("type %q#T argument given to %<delete%>, expected pointer",
451 return error_mark_node
;
454 type
= TREE_TYPE (t
);
456 /* As of Valley Forge, you can delete a pointer to const. */
458 /* You can't delete functions. */
459 if (TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
)
461 error ("cannot delete a function. Only pointer-to-objects are "
462 "valid arguments to %<delete%>");
463 return error_mark_node
;
466 /* Deleting ptr to void is undefined behavior [expr.delete/3]. */
467 if (TREE_CODE (TREE_TYPE (type
)) == VOID_TYPE
)
469 warning (0, "deleting %qT is undefined", type
);
473 /* Deleting a pointer with the value zero is valid and has no effect. */
474 if (integer_zerop (t
))
475 return build1 (NOP_EXPR
, void_type_node
, t
);
478 return build_vec_delete (t
, /*maxindex=*/NULL_TREE
,
479 sfk_deleting_destructor
,
480 use_global_delete
, complain
);
482 return build_delete (type
, t
, sfk_deleting_destructor
,
483 LOOKUP_NORMAL
, use_global_delete
,
487 /* Report an error if the indicated template declaration is not the
488 sort of thing that should be a member template. */
491 check_member_template (tree tmpl
)
495 gcc_assert (TREE_CODE (tmpl
) == TEMPLATE_DECL
);
496 decl
= DECL_TEMPLATE_RESULT (tmpl
);
498 if (TREE_CODE (decl
) == FUNCTION_DECL
499 || DECL_ALIAS_TEMPLATE_P (tmpl
)
500 || (TREE_CODE (decl
) == TYPE_DECL
501 && MAYBE_CLASS_TYPE_P (TREE_TYPE (decl
))))
503 /* The parser rejects template declarations in local classes. */
504 gcc_assert (!current_function_decl
);
505 /* The parser rejects any use of virtual in a function template. */
506 gcc_assert (!(TREE_CODE (decl
) == FUNCTION_DECL
507 && DECL_VIRTUAL_P (decl
)));
509 /* The debug-information generating code doesn't know what to do
510 with member templates. */
511 DECL_IGNORED_P (tmpl
) = 1;
514 error ("template declaration of %q#D", decl
);
517 /* Return true iff TYPE is a valid Java parameter or return type. */
520 acceptable_java_type (tree type
)
522 if (type
== error_mark_node
)
525 if (TREE_CODE (type
) == VOID_TYPE
|| TYPE_FOR_JAVA (type
))
527 if (TREE_CODE (type
) == POINTER_TYPE
|| TREE_CODE (type
) == REFERENCE_TYPE
)
529 type
= TREE_TYPE (type
);
530 if (TREE_CODE (type
) == RECORD_TYPE
)
533 if (! TYPE_FOR_JAVA (type
))
535 if (! CLASSTYPE_TEMPLATE_INFO (type
))
537 args
= CLASSTYPE_TI_ARGS (type
);
538 i
= TREE_VEC_LENGTH (args
);
541 type
= TREE_VEC_ELT (args
, i
);
542 if (TREE_CODE (type
) == POINTER_TYPE
)
543 type
= TREE_TYPE (type
);
544 if (! TYPE_FOR_JAVA (type
))
553 /* For a METHOD in a Java class CTYPE, return true if
554 the parameter and return types are valid Java types.
555 Otherwise, print appropriate error messages, and return false. */
558 check_java_method (tree method
)
561 tree arg_types
= TYPE_ARG_TYPES (TREE_TYPE (method
));
562 tree ret_type
= TREE_TYPE (TREE_TYPE (method
));
564 if (!acceptable_java_type (ret_type
))
566 error ("Java method %qD has non-Java return type %qT",
571 arg_types
= TREE_CHAIN (arg_types
);
572 if (DECL_HAS_IN_CHARGE_PARM_P (method
))
573 arg_types
= TREE_CHAIN (arg_types
);
574 if (DECL_HAS_VTT_PARM_P (method
))
575 arg_types
= TREE_CHAIN (arg_types
);
577 for (; arg_types
!= NULL_TREE
; arg_types
= TREE_CHAIN (arg_types
))
579 tree type
= TREE_VALUE (arg_types
);
580 if (!acceptable_java_type (type
))
582 if (type
!= error_mark_node
)
583 error ("Java method %qD has non-Java parameter type %qT",
591 /* Sanity check: report error if this function FUNCTION is not
592 really a member of the class (CTYPE) it is supposed to belong to.
593 TEMPLATE_PARMS is used to specify the template parameters of a member
594 template passed as FUNCTION_DECL. If the member template is passed as a
595 TEMPLATE_DECL, it can be NULL since the parameters can be extracted
596 from the declaration. If the function is not a function template, it
598 It returns the original declaration for the function, NULL_TREE if
599 no declaration was found, error_mark_node if an error was emitted. */
602 check_classfn (tree ctype
, tree function
, tree template_parms
)
608 if (DECL_USE_TEMPLATE (function
)
609 && !(TREE_CODE (function
) == TEMPLATE_DECL
610 && DECL_TEMPLATE_SPECIALIZATION (function
))
611 && DECL_MEMBER_TEMPLATE_P (DECL_TI_TEMPLATE (function
)))
612 /* Since this is a specialization of a member template,
613 we're not going to find the declaration in the class.
616 struct S { template <typename T> void f(T); };
617 template <> void S::f(int);
619 we're not going to find `S::f(int)', but there's no
620 reason we should, either. We let our callers know we didn't
621 find the method, but we don't complain. */
624 /* Basic sanity check: for a template function, the template parameters
625 either were not passed, or they are the same of DECL_TEMPLATE_PARMS. */
626 if (TREE_CODE (function
) == TEMPLATE_DECL
)
629 && !comp_template_parms (template_parms
,
630 DECL_TEMPLATE_PARMS (function
)))
632 error ("template parameter lists provided don%'t match the "
633 "template parameters of %qD", function
);
634 return error_mark_node
;
636 template_parms
= DECL_TEMPLATE_PARMS (function
);
639 /* OK, is this a definition of a member template? */
640 is_template
= (template_parms
!= NULL_TREE
);
642 /* We must enter the scope here, because conversion operators are
643 named by target type, and type equivalence relies on typenames
644 resolving within the scope of CTYPE. */
645 pushed_scope
= push_scope (ctype
);
646 ix
= class_method_index_for_fn (complete_type (ctype
), function
);
649 VEC(tree
,gc
) *methods
= CLASSTYPE_METHOD_VEC (ctype
);
650 tree fndecls
, fndecl
= 0;
652 const char *format
= NULL
;
654 for (fndecls
= VEC_index (tree
, methods
, ix
);
655 fndecls
; fndecls
= OVL_NEXT (fndecls
))
659 fndecl
= OVL_CURRENT (fndecls
);
660 p1
= TYPE_ARG_TYPES (TREE_TYPE (function
));
661 p2
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
663 /* We cannot simply call decls_match because this doesn't
664 work for static member functions that are pretending to
665 be methods, and because the name may have been changed by
668 /* Get rid of the this parameter on functions that become
670 if (DECL_STATIC_FUNCTION_P (fndecl
)
671 && TREE_CODE (TREE_TYPE (function
)) == METHOD_TYPE
)
672 p1
= TREE_CHAIN (p1
);
674 /* A member template definition only matches a member template
676 if (is_template
!= (TREE_CODE (fndecl
) == TEMPLATE_DECL
))
679 if (same_type_p (TREE_TYPE (TREE_TYPE (function
)),
680 TREE_TYPE (TREE_TYPE (fndecl
)))
681 && compparms (p1
, p2
)
683 || comp_template_parms (template_parms
,
684 DECL_TEMPLATE_PARMS (fndecl
)))
685 && (DECL_TEMPLATE_SPECIALIZATION (function
)
686 == DECL_TEMPLATE_SPECIALIZATION (fndecl
))
687 && (!DECL_TEMPLATE_SPECIALIZATION (function
)
688 || (DECL_TI_TEMPLATE (function
)
689 == DECL_TI_TEMPLATE (fndecl
))))
695 pop_scope (pushed_scope
);
696 return OVL_CURRENT (fndecls
);
699 error_at (DECL_SOURCE_LOCATION (function
),
700 "prototype for %q#D does not match any in class %qT",
702 is_conv_op
= DECL_CONV_FN_P (fndecl
);
705 ix
= CLASSTYPE_FIRST_CONVERSION_SLOT
;
706 fndecls
= VEC_index (tree
, methods
, ix
);
709 fndecl
= OVL_CURRENT (fndecls
);
710 fndecls
= OVL_NEXT (fndecls
);
712 if (!fndecls
&& is_conv_op
)
714 if (VEC_length (tree
, methods
) > (size_t) ++ix
)
716 fndecls
= VEC_index (tree
, methods
, ix
);
717 if (!DECL_CONV_FN_P (OVL_CURRENT (fndecls
)))
729 format
= N_("candidates are: %+#D");
731 format
= N_("candidate is: %+#D");
732 error (format
, fndecl
);
735 else if (!COMPLETE_TYPE_P (ctype
))
736 cxx_incomplete_type_error (function
, ctype
);
738 error ("no %q#D member function declared in class %qT",
742 pop_scope (pushed_scope
);
743 return error_mark_node
;
746 /* DECL is a function with vague linkage. Remember it so that at the
747 end of the translation unit we can decide whether or not to emit
751 note_vague_linkage_fn (tree decl
)
753 DECL_DEFER_OUTPUT (decl
) = 1;
754 VEC_safe_push (tree
, gc
, deferred_fns
, decl
);
757 /* We have just processed the DECL, which is a static data member.
758 The other parameters are as for cp_finish_decl. */
761 finish_static_data_member_decl (tree decl
,
762 tree init
, bool init_const_expr_p
,
766 DECL_CONTEXT (decl
) = current_class_type
;
768 /* We cannot call pushdecl here, because that would fill in the
769 TREE_CHAIN of our decl. Instead, we modify cp_finish_decl to do
770 the right thing, namely, to put this decl out straight away. */
772 if (! processing_template_decl
)
773 VEC_safe_push (tree
, gc
, pending_statics
, decl
);
775 if (LOCAL_CLASS_P (current_class_type
))
776 permerror (input_location
, "local class %q#T shall not have static data member %q#D",
777 current_class_type
, decl
);
779 DECL_IN_AGGR_P (decl
) = 1;
781 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
782 && TYPE_DOMAIN (TREE_TYPE (decl
)) == NULL_TREE
)
783 SET_VAR_HAD_UNKNOWN_BOUND (decl
);
785 cp_finish_decl (decl
, init
, init_const_expr_p
, asmspec_tree
, flags
);
788 /* DECLARATOR and DECLSPECS correspond to a class member. The other
789 parameters are as for cp_finish_decl. Return the DECL for the
790 class member declared. */
793 grokfield (const cp_declarator
*declarator
,
794 cp_decl_specifier_seq
*declspecs
,
795 tree init
, bool init_const_expr_p
,
800 const char *asmspec
= 0;
805 && TREE_CODE (init
) == TREE_LIST
806 && TREE_VALUE (init
) == error_mark_node
807 && TREE_CHAIN (init
) == NULL_TREE
)
810 value
= grokdeclarator (declarator
, declspecs
, FIELD
, init
!= 0, &attrlist
);
811 if (! value
|| error_operand_p (value
))
812 /* friend or constructor went bad. */
813 return error_mark_node
;
815 if (TREE_CODE (value
) == TYPE_DECL
&& init
)
817 error ("typedef %qD is initialized (use decltype instead)", value
);
821 /* Pass friendly classes back. */
822 if (value
== void_type_node
)
825 /* Pass friend decls back. */
826 if ((TREE_CODE (value
) == FUNCTION_DECL
827 || TREE_CODE (value
) == TEMPLATE_DECL
)
828 && DECL_CONTEXT (value
) != current_class_type
)
831 name
= DECL_NAME (value
);
833 if (name
!= NULL_TREE
)
835 if (TREE_CODE (name
) == TEMPLATE_ID_EXPR
)
837 error ("explicit template argument list not allowed");
838 return error_mark_node
;
841 if (IDENTIFIER_POINTER (name
)[0] == '_'
842 && ! strcmp (IDENTIFIER_POINTER (name
), "_vptr"))
843 error ("member %qD conflicts with virtual function table field name",
847 /* Stash away type declarations. */
848 if (TREE_CODE (value
) == TYPE_DECL
)
850 DECL_NONLOCAL (value
) = 1;
851 DECL_CONTEXT (value
) = current_class_type
;
857 /* If this is a typedef that names the class for linkage purposes
858 (7.1.3p8), apply any attributes directly to the type. */
859 if (TAGGED_TYPE_P (TREE_TYPE (value
))
860 && value
== TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))))
861 attrflags
= ATTR_FLAG_TYPE_IN_PLACE
;
863 cplus_decl_attributes (&value
, attrlist
, attrflags
);
866 if (decl_spec_seq_has_spec_p (declspecs
, ds_typedef
)
867 && TREE_TYPE (value
) != error_mark_node
868 && TYPE_NAME (TYPE_MAIN_VARIANT (TREE_TYPE (value
))) != value
)
869 set_underlying_type (value
);
871 /* It's important that push_template_decl below follows
872 set_underlying_type above so that the created template
873 carries the properly set type of VALUE. */
874 if (processing_template_decl
)
875 value
= push_template_decl (value
);
877 record_locally_defined_typedef (value
);
881 if (DECL_IN_AGGR_P (value
))
883 error ("%qD is already defined in %qT", value
, DECL_CONTEXT (value
));
884 return void_type_node
;
887 if (asmspec_tree
&& asmspec_tree
!= error_mark_node
)
888 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
892 if (TREE_CODE (value
) == FUNCTION_DECL
)
894 /* Initializers for functions are rejected early in the parser.
895 If we get here, it must be a pure specifier for a method. */
896 if (init
== ridpointers
[(int)RID_DELETE
])
898 DECL_DELETED_FN (value
) = 1;
899 DECL_DECLARED_INLINE_P (value
) = 1;
900 DECL_INITIAL (value
) = error_mark_node
;
902 else if (init
== ridpointers
[(int)RID_DEFAULT
])
904 if (defaultable_fn_check (value
))
906 DECL_DEFAULTED_FN (value
) = 1;
907 DECL_INITIALIZED_IN_CLASS_P (value
) = 1;
908 DECL_DECLARED_INLINE_P (value
) = 1;
911 else if (TREE_CODE (init
) == DEFAULT_ARG
)
912 error ("invalid initializer for member function %qD", value
);
913 else if (TREE_CODE (TREE_TYPE (value
)) == METHOD_TYPE
)
915 if (integer_zerop (init
))
916 DECL_PURE_VIRTUAL_P (value
) = 1;
917 else if (error_operand_p (init
))
918 ; /* An error has already been reported. */
920 error ("invalid initializer for member function %qD",
925 gcc_assert (TREE_CODE (TREE_TYPE (value
)) == FUNCTION_TYPE
);
926 error ("initializer specified for static member function %qD",
930 else if (TREE_CODE (value
) == FIELD_DECL
)
931 /* C++11 NSDMI, keep going. */;
932 else if (TREE_CODE (value
) != VAR_DECL
)
934 else if (!processing_template_decl
)
936 if (TREE_CODE (init
) == CONSTRUCTOR
)
937 init
= digest_init (TREE_TYPE (value
), init
, tf_warning_or_error
);
938 init
= maybe_constant_init (init
);
940 if (init
!= error_mark_node
&& !TREE_CONSTANT (init
))
942 /* We can allow references to things that are effectively
943 static, since references are initialized with the
945 if (TREE_CODE (TREE_TYPE (value
)) != REFERENCE_TYPE
946 || (TREE_STATIC (init
) == 0
947 && (!DECL_P (init
) || DECL_EXTERNAL (init
) == 0)))
949 error ("field initializer is not constant");
950 init
= error_mark_node
;
956 if (processing_template_decl
957 && (TREE_CODE (value
) == VAR_DECL
|| TREE_CODE (value
) == FUNCTION_DECL
))
959 value
= push_template_decl (value
);
960 if (error_operand_p (value
))
961 return error_mark_node
;
965 cplus_decl_attributes (&value
, attrlist
, 0);
967 if (init
&& BRACE_ENCLOSED_INITIALIZER_P (init
)
968 && CONSTRUCTOR_IS_DIRECT_INIT (init
))
969 flags
= LOOKUP_NORMAL
;
971 flags
= LOOKUP_IMPLICIT
;
973 switch (TREE_CODE (value
))
976 finish_static_data_member_decl (value
, init
, init_const_expr_p
,
977 asmspec_tree
, flags
);
982 error ("%<asm%> specifiers are not permitted on non-static data members");
983 if (DECL_INITIAL (value
) == error_mark_node
)
984 init
= error_mark_node
;
985 cp_finish_decl (value
, init
, /*init_const_expr_p=*/false,
987 DECL_IN_AGGR_P (value
) = 1;
992 set_user_assembler_name (value
, asmspec
);
994 cp_finish_decl (value
,
996 /*init_const_expr_p=*/false,
997 asmspec_tree
, flags
);
999 /* Pass friends back this way. */
1000 if (DECL_FRIEND_P (value
))
1001 return void_type_node
;
1003 DECL_IN_AGGR_P (value
) = 1;
1012 /* Like `grokfield', but for bitfields.
1013 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node. */
1016 grokbitfield (const cp_declarator
*declarator
,
1017 cp_decl_specifier_seq
*declspecs
, tree width
,
1020 tree value
= grokdeclarator (declarator
, declspecs
, BITFIELD
, 0, &attrlist
);
1022 if (value
== error_mark_node
)
1023 return NULL_TREE
; /* friends went bad. */
1025 /* Pass friendly classes back. */
1026 if (TREE_CODE (value
) == VOID_TYPE
)
1027 return void_type_node
;
1029 if (!INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (value
))
1030 && (POINTER_TYPE_P (value
)
1031 || !dependent_type_p (TREE_TYPE (value
))))
1033 error ("bit-field %qD with non-integral type", value
);
1034 return error_mark_node
;
1037 if (TREE_CODE (value
) == TYPE_DECL
)
1039 error ("cannot declare %qD to be a bit-field type", value
);
1043 /* Usually, finish_struct_1 catches bitfields with invalid types.
1044 But, in the case of bitfields with function type, we confuse
1045 ourselves into thinking they are member functions, so we must
1047 if (TREE_CODE (value
) == FUNCTION_DECL
)
1049 error ("cannot declare bit-field %qD with function type",
1054 if (DECL_IN_AGGR_P (value
))
1056 error ("%qD is already defined in the class %qT", value
,
1057 DECL_CONTEXT (value
));
1058 return void_type_node
;
1061 if (TREE_STATIC (value
))
1063 error ("static member %qD cannot be a bit-field", value
);
1066 cp_finish_decl (value
, NULL_TREE
, false, NULL_TREE
, 0);
1068 if (width
!= error_mark_node
)
1070 /* The width must be an integer type. */
1071 if (!type_dependent_expression_p (width
)
1072 && !INTEGRAL_OR_UNSCOPED_ENUMERATION_TYPE_P (TREE_TYPE (width
)))
1073 error ("width of bit-field %qD has non-integral type %qT", value
,
1075 DECL_INITIAL (value
) = width
;
1076 SET_DECL_C_BIT_FIELD (value
);
1079 DECL_IN_AGGR_P (value
) = 1;
1082 cplus_decl_attributes (&value
, attrlist
, /*flags=*/0);
1088 /* Returns true iff ATTR is an attribute which needs to be applied at
1089 instantiation time rather than template definition time. */
1092 is_late_template_attribute (tree attr
, tree decl
)
1094 tree name
= TREE_PURPOSE (attr
);
1095 tree args
= TREE_VALUE (attr
);
1096 const struct attribute_spec
*spec
= lookup_attribute_spec (name
);
1100 /* Unknown attribute. */
1103 /* Attribute weak handling wants to write out assembly right away. */
1104 if (is_attribute_p ("weak", name
))
1107 /* If any of the arguments are dependent expressions, we can't evaluate
1108 the attribute until instantiation time. */
1109 for (arg
= args
; arg
; arg
= TREE_CHAIN (arg
))
1111 tree t
= TREE_VALUE (arg
);
1113 /* If the first attribute argument is an identifier, only consider
1114 second and following arguments. Attributes like mode, format,
1115 cleanup and several target specific attributes aren't late
1116 just because they have an IDENTIFIER_NODE as first argument. */
1117 if (arg
== args
&& TREE_CODE (t
) == IDENTIFIER_NODE
)
1120 if (value_dependent_expression_p (t
)
1121 || type_dependent_expression_p (t
))
1125 if (TREE_CODE (decl
) == TYPE_DECL
1127 || spec
->type_required
)
1129 tree type
= TYPE_P (decl
) ? decl
: TREE_TYPE (decl
);
1131 /* We can't apply any attributes to a completely unknown type until
1132 instantiation time. */
1133 enum tree_code code
= TREE_CODE (type
);
1134 if (code
== TEMPLATE_TYPE_PARM
1135 || code
== BOUND_TEMPLATE_TEMPLATE_PARM
1136 || code
== TYPENAME_TYPE
)
1138 /* Also defer most attributes on dependent types. This is not
1139 necessary in all cases, but is the better default. */
1140 else if (dependent_type_p (type
)
1141 /* But attribute visibility specifically works on
1143 && !is_attribute_p ("visibility", name
))
1152 /* ATTR_P is a list of attributes. Remove any attributes which need to be
1153 applied at instantiation time and return them. If IS_DEPENDENT is true,
1154 the declaration itself is dependent, so all attributes should be applied
1155 at instantiation time. */
1158 splice_template_attributes (tree
*attr_p
, tree decl
)
1161 tree late_attrs
= NULL_TREE
;
1162 tree
*q
= &late_attrs
;
1169 if (is_late_template_attribute (*p
, decl
))
1171 ATTR_IS_DEPENDENT (*p
) = 1;
1173 *p
= TREE_CHAIN (*p
);
1174 q
= &TREE_CHAIN (*q
);
1178 p
= &TREE_CHAIN (*p
);
1184 /* Remove any late attributes from the list in ATTR_P and attach them to
1188 save_template_attributes (tree
*attr_p
, tree
*decl_p
)
1190 tree late_attrs
= splice_template_attributes (attr_p
, *decl_p
);
1192 tree old_attrs
= NULL_TREE
;
1197 if (DECL_P (*decl_p
))
1198 q
= &DECL_ATTRIBUTES (*decl_p
);
1200 q
= &TYPE_ATTRIBUTES (*decl_p
);
1204 /* Merge the late attributes at the beginning with the attribute
1206 late_attrs
= merge_attributes (late_attrs
, *q
);
1209 if (!DECL_P (*decl_p
) && *decl_p
== TYPE_MAIN_VARIANT (*decl_p
))
1211 /* We've added new attributes directly to the main variant, so
1212 now we need to update all of the other variants to include
1213 these new attributes. */
1215 for (variant
= TYPE_NEXT_VARIANT (*decl_p
); variant
;
1216 variant
= TYPE_NEXT_VARIANT (variant
))
1218 gcc_assert (TYPE_ATTRIBUTES (variant
) == old_attrs
);
1219 TYPE_ATTRIBUTES (variant
) = TYPE_ATTRIBUTES (*decl_p
);
1224 /* Like reconstruct_complex_type, but handle also template trees. */
1227 cp_reconstruct_complex_type (tree type
, tree bottom
)
1231 if (TREE_CODE (type
) == POINTER_TYPE
)
1233 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1234 outer
= build_pointer_type_for_mode (inner
, TYPE_MODE (type
),
1235 TYPE_REF_CAN_ALIAS_ALL (type
));
1237 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
1239 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1240 outer
= build_reference_type_for_mode (inner
, TYPE_MODE (type
),
1241 TYPE_REF_CAN_ALIAS_ALL (type
));
1243 else if (TREE_CODE (type
) == ARRAY_TYPE
)
1245 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1246 outer
= build_cplus_array_type (inner
, TYPE_DOMAIN (type
));
1247 /* Don't call cp_build_qualified_type on ARRAY_TYPEs, the
1248 element type qualification will be handled by the recursive
1249 cp_reconstruct_complex_type call and cp_build_qualified_type
1250 for ARRAY_TYPEs changes the element type. */
1253 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
1255 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1256 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
1257 outer
= apply_memfn_quals (outer
, type_memfn_quals (type
));
1259 else if (TREE_CODE (type
) == METHOD_TYPE
)
1261 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1262 /* The build_method_type_directly() routine prepends 'this' to argument list,
1263 so we must compensate by getting rid of it. */
1265 = build_method_type_directly
1266 (class_of_this_parm (type
), inner
,
1267 TREE_CHAIN (TYPE_ARG_TYPES (type
)));
1269 else if (TREE_CODE (type
) == OFFSET_TYPE
)
1271 inner
= cp_reconstruct_complex_type (TREE_TYPE (type
), bottom
);
1272 outer
= build_offset_type (TYPE_OFFSET_BASETYPE (type
), inner
);
1277 if (TYPE_ATTRIBUTES (type
))
1278 outer
= cp_build_type_attribute_variant (outer
, TYPE_ATTRIBUTES (type
));
1279 return cp_build_qualified_type (outer
, cp_type_quals (type
));
1282 /* Replaces any constexpr expression that may be into the attributes
1283 arguments with their reduced value. */
1286 cp_check_const_attributes (tree attributes
)
1289 for (attr
= attributes
; attr
; attr
= TREE_CHAIN (attr
))
1292 for (arg
= TREE_VALUE (attr
); arg
; arg
= TREE_CHAIN (arg
))
1294 tree expr
= TREE_VALUE (arg
);
1296 TREE_VALUE (arg
) = maybe_constant_value (expr
);
1301 /* Like decl_attributes, but handle C++ complexity. */
1304 cplus_decl_attributes (tree
*decl
, tree attributes
, int flags
)
1306 if (*decl
== NULL_TREE
|| *decl
== void_type_node
1307 || *decl
== error_mark_node
1308 || attributes
== NULL_TREE
)
1311 if (processing_template_decl
)
1313 if (check_for_bare_parameter_packs (attributes
))
1316 save_template_attributes (&attributes
, decl
);
1317 if (attributes
== NULL_TREE
)
1321 cp_check_const_attributes (attributes
);
1323 if (TREE_CODE (*decl
) == TEMPLATE_DECL
)
1324 decl
= &DECL_TEMPLATE_RESULT (*decl
);
1326 decl_attributes (decl
, attributes
, flags
);
1328 if (TREE_CODE (*decl
) == TYPE_DECL
)
1329 SET_IDENTIFIER_TYPE_VALUE (DECL_NAME (*decl
), TREE_TYPE (*decl
));
1332 /* Walks through the namespace- or function-scope anonymous union
1333 OBJECT, with the indicated TYPE, building appropriate VAR_DECLs.
1334 Returns one of the fields for use in the mangled name. */
1337 build_anon_union_vars (tree type
, tree object
)
1339 tree main_decl
= NULL_TREE
;
1342 /* Rather than write the code to handle the non-union case,
1343 just give an error. */
1344 if (TREE_CODE (type
) != UNION_TYPE
)
1346 error ("anonymous struct not inside named type");
1347 return error_mark_node
;
1350 for (field
= TYPE_FIELDS (type
);
1352 field
= DECL_CHAIN (field
))
1357 if (DECL_ARTIFICIAL (field
))
1359 if (TREE_CODE (field
) != FIELD_DECL
)
1361 permerror (input_location
, "%q+#D invalid; an anonymous union can only "
1362 "have non-static data members", field
);
1366 if (TREE_PRIVATE (field
))
1367 permerror (input_location
, "private member %q+#D in anonymous union", field
);
1368 else if (TREE_PROTECTED (field
))
1369 permerror (input_location
, "protected member %q+#D in anonymous union", field
);
1371 if (processing_template_decl
)
1372 ref
= build_min_nt_loc (UNKNOWN_LOCATION
, COMPONENT_REF
, object
,
1373 DECL_NAME (field
), NULL_TREE
);
1375 ref
= build_class_member_access_expr (object
, field
, NULL_TREE
,
1376 false, tf_warning_or_error
);
1378 if (DECL_NAME (field
))
1382 decl
= build_decl (input_location
,
1383 VAR_DECL
, DECL_NAME (field
), TREE_TYPE (field
));
1384 DECL_ANON_UNION_VAR_P (decl
) = 1;
1385 DECL_ARTIFICIAL (decl
) = 1;
1387 base
= get_base_address (object
);
1388 TREE_PUBLIC (decl
) = TREE_PUBLIC (base
);
1389 TREE_STATIC (decl
) = TREE_STATIC (base
);
1390 DECL_EXTERNAL (decl
) = DECL_EXTERNAL (base
);
1392 SET_DECL_VALUE_EXPR (decl
, ref
);
1393 DECL_HAS_VALUE_EXPR_P (decl
) = 1;
1395 decl
= pushdecl (decl
);
1397 else if (ANON_AGGR_TYPE_P (TREE_TYPE (field
)))
1398 decl
= build_anon_union_vars (TREE_TYPE (field
), ref
);
1402 if (main_decl
== NULL_TREE
)
1409 /* Finish off the processing of a UNION_TYPE structure. If the union is an
1410 anonymous union, then all members must be laid out together. PUBLIC_P
1411 is nonzero if this union is not declared static. */
1414 finish_anon_union (tree anon_union_decl
)
1420 if (anon_union_decl
== error_mark_node
)
1423 type
= TREE_TYPE (anon_union_decl
);
1424 public_p
= TREE_PUBLIC (anon_union_decl
);
1426 /* The VAR_DECL's context is the same as the TYPE's context. */
1427 DECL_CONTEXT (anon_union_decl
) = DECL_CONTEXT (TYPE_NAME (type
));
1429 if (TYPE_FIELDS (type
) == NULL_TREE
)
1434 error ("namespace-scope anonymous aggregates must be static");
1438 main_decl
= build_anon_union_vars (type
, anon_union_decl
);
1439 if (main_decl
== error_mark_node
)
1441 if (main_decl
== NULL_TREE
)
1443 warning (0, "anonymous union with no members");
1447 if (!processing_template_decl
)
1449 /* Use main_decl to set the mangled name. */
1450 DECL_NAME (anon_union_decl
) = DECL_NAME (main_decl
);
1451 maybe_commonize_var (anon_union_decl
);
1452 if (TREE_STATIC (anon_union_decl
) || DECL_EXTERNAL (anon_union_decl
))
1453 mangle_decl (anon_union_decl
);
1454 DECL_NAME (anon_union_decl
) = NULL_TREE
;
1457 pushdecl (anon_union_decl
);
1458 cp_finish_decl (anon_union_decl
, NULL_TREE
, false, NULL_TREE
, 0);
1461 /* Auxiliary functions to make type signatures for
1462 `operator new' and `operator delete' correspond to
1463 what compiler will be expecting. */
1466 coerce_new_type (tree type
)
1469 tree args
= TYPE_ARG_TYPES (type
);
1471 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1473 if (!same_type_p (TREE_TYPE (type
), ptr_type_node
))
1476 error ("%<operator new%> must return type %qT", ptr_type_node
);
1479 if (args
&& args
!= void_list_node
)
1481 if (TREE_PURPOSE (args
))
1483 /* [basic.stc.dynamic.allocation]
1485 The first parameter shall not have an associated default
1487 error ("the first parameter of %<operator new%> cannot "
1488 "have a default argument");
1489 /* Throw away the default argument. */
1490 TREE_PURPOSE (args
) = NULL_TREE
;
1493 if (!same_type_p (TREE_VALUE (args
), size_type_node
))
1496 args
= TREE_CHAIN (args
);
1503 permerror (input_location
, "%<operator new%> takes type %<size_t%> (%qT) "
1504 "as first parameter", size_type_node
);
1509 args
= tree_cons (NULL_TREE
, size_type_node
, args
);
1512 type
= build_exception_variant
1513 (build_function_type (ptr_type_node
, args
),
1514 TYPE_RAISES_EXCEPTIONS (type
));
1522 coerce_delete_type (tree type
)
1525 tree args
= TYPE_ARG_TYPES (type
);
1527 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
1529 if (!same_type_p (TREE_TYPE (type
), void_type_node
))
1532 error ("%<operator delete%> must return type %qT", void_type_node
);
1535 if (!args
|| args
== void_list_node
1536 || !same_type_p (TREE_VALUE (args
), ptr_type_node
))
1539 if (args
&& args
!= void_list_node
)
1540 args
= TREE_CHAIN (args
);
1541 error ("%<operator delete%> takes type %qT as first parameter",
1547 args
= tree_cons (NULL_TREE
, ptr_type_node
, args
);
1550 type
= build_exception_variant
1551 (build_function_type (void_type_node
, args
),
1552 TYPE_RAISES_EXCEPTIONS (type
));
1560 /* DECL is a VAR_DECL for a vtable: walk through the entries in the vtable
1561 and mark them as needed. */
1564 mark_vtable_entries (tree decl
)
1567 unsigned HOST_WIDE_INT idx
;
1569 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (DECL_INITIAL (decl
)),
1574 STRIP_NOPS (fnaddr
);
1576 if (TREE_CODE (fnaddr
) != ADDR_EXPR
1577 && TREE_CODE (fnaddr
) != FDESC_EXPR
)
1578 /* This entry is an offset: a virtual base class offset, a
1579 virtual call offset, an RTTI offset, etc. */
1582 fn
= TREE_OPERAND (fnaddr
, 0);
1583 TREE_ADDRESSABLE (fn
) = 1;
1584 /* When we don't have vcall offsets, we output thunks whenever
1585 we output the vtables that contain them. With vcall offsets,
1586 we know all the thunks we'll need when we emit a virtual
1587 function, so we emit the thunks there instead. */
1588 if (DECL_THUNK_P (fn
))
1589 use_thunk (fn
, /*emit_p=*/0);
1594 /* Set DECL up to have the closest approximation of "initialized common"
1595 linkage available. */
1598 comdat_linkage (tree decl
)
1601 make_decl_one_only (decl
, cxx_comdat_group (decl
));
1602 else if (TREE_CODE (decl
) == FUNCTION_DECL
1603 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_ARTIFICIAL (decl
)))
1604 /* We can just emit function and compiler-generated variables
1605 statically; having multiple copies is (for the most part) only
1608 There are two correctness issues, however: the address of a
1609 template instantiation with external linkage should be the
1610 same, independent of what translation unit asks for the
1611 address, and this will not hold when we emit multiple copies of
1612 the function. However, there's little else we can do.
1614 Also, by default, the typeinfo implementation assumes that
1615 there will be only one copy of the string used as the name for
1616 each type. Therefore, if weak symbols are unavailable, the
1617 run-time library should perform a more conservative check; it
1618 should perform a string comparison, rather than an address
1620 TREE_PUBLIC (decl
) = 0;
1623 /* Static data member template instantiations, however, cannot
1624 have multiple copies. */
1625 if (DECL_INITIAL (decl
) == 0
1626 || DECL_INITIAL (decl
) == error_mark_node
)
1627 DECL_COMMON (decl
) = 1;
1628 else if (EMPTY_CONSTRUCTOR_P (DECL_INITIAL (decl
)))
1630 DECL_COMMON (decl
) = 1;
1631 DECL_INITIAL (decl
) = error_mark_node
;
1633 else if (!DECL_EXPLICIT_INSTANTIATION (decl
))
1635 /* We can't do anything useful; leave vars for explicit
1637 DECL_EXTERNAL (decl
) = 1;
1638 DECL_NOT_REALLY_EXTERN (decl
) = 0;
1642 DECL_COMDAT (decl
) = 1;
1645 /* For win32 we also want to put explicit instantiations in
1646 linkonce sections, so that they will be merged with implicit
1647 instantiations; otherwise we get duplicate symbol errors.
1648 For Darwin we do not want explicit instantiations to be
1652 maybe_make_one_only (tree decl
)
1654 /* We used to say that this was not necessary on targets that support weak
1655 symbols, because the implicit instantiations will defer to the explicit
1656 one. However, that's not actually the case in SVR4; a strong definition
1657 after a weak one is an error. Also, not making explicit
1658 instantiations one_only means that we can end up with two copies of
1659 some template instantiations. */
1663 /* We can't set DECL_COMDAT on functions, or cp_finish_file will think
1664 we can get away with not emitting them if they aren't used. We need
1665 to for variables so that cp_finish_decl will update their linkage,
1666 because their DECL_INITIAL may not have been set properly yet. */
1668 if (!TARGET_WEAK_NOT_IN_ARCHIVE_TOC
1669 || (! DECL_EXPLICIT_INSTANTIATION (decl
)
1670 && ! DECL_TEMPLATE_SPECIALIZATION (decl
)))
1672 make_decl_one_only (decl
, cxx_comdat_group (decl
));
1674 if (TREE_CODE (decl
) == VAR_DECL
)
1676 DECL_COMDAT (decl
) = 1;
1677 /* Mark it needed so we don't forget to emit it. */
1678 mark_decl_referenced (decl
);
1679 TREE_USED (decl
) = 1;
1684 /* Returns true iff DECL, a FUNCTION_DECL or VAR_DECL, has vague linkage.
1685 This predicate will give the right answer during parsing of the
1686 function, which other tests may not. */
1689 vague_linkage_p (tree decl
)
1691 /* Unfortunately, import_export_decl has not always been called
1692 before the function is processed, so we cannot simply check
1694 return (DECL_COMDAT (decl
)
1695 || (((TREE_CODE (decl
) == FUNCTION_DECL
1696 && DECL_DECLARED_INLINE_P (decl
))
1697 || (DECL_LANG_SPECIFIC (decl
)
1698 && DECL_TEMPLATE_INSTANTIATION (decl
)))
1699 && TREE_PUBLIC (decl
)));
1702 /* Determine whether or not we want to specifically import or export CTYPE,
1703 using various heuristics. */
1706 import_export_class (tree ctype
)
1708 /* -1 for imported, 1 for exported. */
1709 int import_export
= 0;
1711 /* It only makes sense to call this function at EOF. The reason is
1712 that this function looks at whether or not the first non-inline
1713 non-abstract virtual member function has been defined in this
1714 translation unit. But, we can't possibly know that until we've
1715 seen the entire translation unit. */
1716 gcc_assert (at_eof
);
1718 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
1721 /* If MULTIPLE_SYMBOL_SPACES is set and we saw a #pragma interface,
1722 we will have CLASSTYPE_INTERFACE_ONLY set but not
1723 CLASSTYPE_INTERFACE_KNOWN. In that case, we don't want to use this
1724 heuristic because someone will supply a #pragma implementation
1725 elsewhere, and deducing it here would produce a conflict. */
1726 if (CLASSTYPE_INTERFACE_ONLY (ctype
))
1729 if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (ctype
)))
1731 else if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (ctype
)))
1733 else if (CLASSTYPE_IMPLICIT_INSTANTIATION (ctype
)
1734 && !flag_implicit_templates
)
1735 /* For a template class, without -fimplicit-templates, check the
1736 repository. If the virtual table is assigned to this
1737 translation unit, then export the class; otherwise, import
1739 import_export
= repo_export_class_p (ctype
) ? 1 : -1;
1740 else if (TYPE_POLYMORPHIC_P (ctype
))
1742 /* The ABI specifies that the virtual table and associated
1743 information are emitted with the key method, if any. */
1744 tree method
= CLASSTYPE_KEY_METHOD (ctype
);
1745 /* If weak symbol support is not available, then we must be
1746 careful not to emit the vtable when the key function is
1747 inline. An inline function can be defined in multiple
1748 translation units. If we were to emit the vtable in each
1749 translation unit containing a definition, we would get
1750 multiple definition errors at link-time. */
1751 if (method
&& (flag_weak
|| ! DECL_DECLARED_INLINE_P (method
)))
1752 import_export
= (DECL_REALLY_EXTERN (method
) ? -1 : 1);
1755 /* When MULTIPLE_SYMBOL_SPACES is set, we cannot count on seeing
1756 a definition anywhere else. */
1757 if (MULTIPLE_SYMBOL_SPACES
&& import_export
== -1)
1760 /* Allow back ends the chance to overrule the decision. */
1761 if (targetm
.cxx
.import_export_class
)
1762 import_export
= targetm
.cxx
.import_export_class (ctype
, import_export
);
1766 SET_CLASSTYPE_INTERFACE_KNOWN (ctype
);
1767 CLASSTYPE_INTERFACE_ONLY (ctype
) = (import_export
< 0);
1771 /* Return true if VAR has already been provided to the back end; in that
1772 case VAR should not be modified further by the front end. */
1774 var_finalized_p (tree var
)
1776 return varpool_node (var
)->finalized
;
1779 /* DECL is a VAR_DECL or FUNCTION_DECL which, for whatever reason,
1780 must be emitted in this translation unit. Mark it as such. */
1783 mark_needed (tree decl
)
1785 TREE_USED (decl
) = 1;
1786 mark_decl_referenced (decl
);
1789 /* DECL is either a FUNCTION_DECL or a VAR_DECL. This function
1790 returns true if a definition of this entity should be provided in
1791 this object file. Callers use this function to determine whether
1792 or not to let the back end know that a definition of DECL is
1793 available in this translation unit. */
1796 decl_needed_p (tree decl
)
1798 gcc_assert (TREE_CODE (decl
) == VAR_DECL
1799 || TREE_CODE (decl
) == FUNCTION_DECL
);
1800 /* This function should only be called at the end of the translation
1801 unit. We cannot be sure of whether or not something will be
1802 COMDAT until that point. */
1803 gcc_assert (at_eof
);
1805 /* All entities with external linkage that are not COMDAT should be
1806 emitted; they may be referred to from other object files. */
1807 if (TREE_PUBLIC (decl
) && !DECL_COMDAT (decl
))
1809 /* If this entity was used, let the back end see it; it will decide
1810 whether or not to emit it into the object file. */
1811 if (TREE_USED (decl
))
1813 /* Functions marked "dllexport" must be emitted so that they are
1814 visible to other DLLs. */
1815 if (flag_keep_inline_dllexport
1816 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (decl
)))
1818 /* Otherwise, DECL does not need to be emitted -- yet. A subsequent
1819 reference to DECL might cause it to be emitted later. */
1823 /* If necessary, write out the vtables for the dynamic class CTYPE.
1824 Returns true if any vtables were emitted. */
1827 maybe_emit_vtables (tree ctype
)
1832 struct varpool_node
*current
= NULL
, *last
= NULL
;
1834 /* If the vtables for this class have already been emitted there is
1835 nothing more to do. */
1836 primary_vtbl
= CLASSTYPE_VTABLES (ctype
);
1837 if (var_finalized_p (primary_vtbl
))
1839 /* Ignore dummy vtables made by get_vtable_decl. */
1840 if (TREE_TYPE (primary_vtbl
) == void_type_node
)
1843 /* On some targets, we cannot determine the key method until the end
1844 of the translation unit -- which is when this function is
1846 if (!targetm
.cxx
.key_method_may_be_inline ())
1847 determine_key_method (ctype
);
1849 /* See if any of the vtables are needed. */
1850 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= DECL_CHAIN (vtbl
))
1852 import_export_decl (vtbl
);
1853 if (DECL_NOT_REALLY_EXTERN (vtbl
) && decl_needed_p (vtbl
))
1858 /* If the references to this class' vtables are optimized away,
1859 still emit the appropriate debugging information. See
1861 if (DECL_COMDAT (primary_vtbl
)
1862 && CLASSTYPE_DEBUG_REQUESTED (ctype
))
1863 note_debug_info_needed (ctype
);
1867 /* The ABI requires that we emit all of the vtables if we emit any
1869 for (vtbl
= CLASSTYPE_VTABLES (ctype
); vtbl
; vtbl
= DECL_CHAIN (vtbl
))
1871 /* Mark entities references from the virtual table as used. */
1872 mark_vtable_entries (vtbl
);
1874 if (TREE_TYPE (DECL_INITIAL (vtbl
)) == 0)
1876 VEC(tree
,gc
)* cleanups
= NULL
;
1877 tree expr
= store_init_value (vtbl
, DECL_INITIAL (vtbl
), &cleanups
,
1880 /* It had better be all done at compile-time. */
1881 gcc_assert (!expr
&& !cleanups
);
1885 DECL_EXTERNAL (vtbl
) = 0;
1886 rest_of_decl_compilation (vtbl
, 1, 1);
1888 /* Because we're only doing syntax-checking, we'll never end up
1889 actually marking the variable as written. */
1890 if (flag_syntax_only
)
1891 TREE_ASM_WRITTEN (vtbl
) = 1;
1892 else if (DECL_ONE_ONLY (vtbl
))
1894 current
= varpool_node (vtbl
);
1896 symtab_add_to_same_comdat_group ((symtab_node
) current
, (symtab_node
) last
);
1901 /* Since we're writing out the vtable here, also write the debug
1903 note_debug_info_needed (ctype
);
1908 /* A special return value from type_visibility meaning internal
1911 enum { VISIBILITY_ANON
= VISIBILITY_INTERNAL
+1 };
1913 /* walk_tree helper function for type_visibility. */
1916 min_vis_r (tree
*tp
, int *walk_subtrees
, void *data
)
1918 int *vis_p
= (int *)data
;
1923 else if (CLASS_TYPE_P (*tp
))
1925 if (!TREE_PUBLIC (TYPE_MAIN_DECL (*tp
)))
1927 *vis_p
= VISIBILITY_ANON
;
1930 else if (CLASSTYPE_VISIBILITY (*tp
) > *vis_p
)
1931 *vis_p
= CLASSTYPE_VISIBILITY (*tp
);
1936 /* Returns the visibility of TYPE, which is the minimum visibility of its
1940 type_visibility (tree type
)
1942 int vis
= VISIBILITY_DEFAULT
;
1943 cp_walk_tree_without_duplicates (&type
, min_vis_r
, &vis
);
1947 /* Limit the visibility of DECL to VISIBILITY, if not explicitly
1948 specified (or if VISIBILITY is static). If TMPL is true, this
1949 constraint is for a template argument, and takes precedence
1950 over explicitly-specified visibility on the template. */
1953 constrain_visibility (tree decl
, int visibility
, bool tmpl
)
1955 if (visibility
== VISIBILITY_ANON
)
1957 /* extern "C" declarations aren't affected by the anonymous
1959 if (!DECL_EXTERN_C_P (decl
))
1961 TREE_PUBLIC (decl
) = 0;
1962 DECL_WEAK (decl
) = 0;
1963 DECL_COMMON (decl
) = 0;
1964 DECL_COMDAT_GROUP (decl
) = NULL_TREE
;
1965 DECL_INTERFACE_KNOWN (decl
) = 1;
1966 if (DECL_LANG_SPECIFIC (decl
))
1967 DECL_NOT_REALLY_EXTERN (decl
) = 1;
1970 else if (visibility
> DECL_VISIBILITY (decl
)
1971 && (tmpl
|| !DECL_VISIBILITY_SPECIFIED (decl
)))
1973 DECL_VISIBILITY (decl
) = (enum symbol_visibility
) visibility
;
1974 /* This visibility was not specified. */
1975 DECL_VISIBILITY_SPECIFIED (decl
) = false;
1979 /* Constrain the visibility of DECL based on the visibility of its template
1983 constrain_visibility_for_template (tree decl
, tree targs
)
1985 /* If this is a template instantiation, check the innermost
1986 template args for visibility constraints. The outer template
1987 args are covered by the class check. */
1988 tree args
= INNERMOST_TEMPLATE_ARGS (targs
);
1990 for (i
= TREE_VEC_LENGTH (args
); i
> 0; --i
)
1994 tree arg
= TREE_VEC_ELT (args
, i
-1);
1996 vis
= type_visibility (arg
);
1997 else if (TREE_TYPE (arg
) && POINTER_TYPE_P (TREE_TYPE (arg
)))
2000 if (TREE_CODE (arg
) == ADDR_EXPR
)
2001 arg
= TREE_OPERAND (arg
, 0);
2002 if (TREE_CODE (arg
) == VAR_DECL
2003 || TREE_CODE (arg
) == FUNCTION_DECL
)
2005 if (! TREE_PUBLIC (arg
))
2006 vis
= VISIBILITY_ANON
;
2008 vis
= DECL_VISIBILITY (arg
);
2012 constrain_visibility (decl
, vis
, true);
2016 /* Like c_determine_visibility, but with additional C++-specific
2019 Function-scope entities can rely on the function's visibility because
2020 it is set in start_preparsed_function.
2022 Class-scope entities cannot rely on the class's visibility until the end
2023 of the enclosing class definition.
2025 Note that because namespaces have multiple independent definitions,
2026 namespace visibility is handled elsewhere using the #pragma visibility
2027 machinery rather than by decorating the namespace declaration.
2029 The goal is for constraints from the type to give a diagnostic, and
2030 other constraints to be applied silently. */
2033 determine_visibility (tree decl
)
2035 tree class_type
= NULL_TREE
;
2037 bool orig_visibility_specified
;
2038 enum symbol_visibility orig_visibility
;
2040 /* Remember that all decls get VISIBILITY_DEFAULT when built. */
2042 /* Only relevant for names with external linkage. */
2043 if (!TREE_PUBLIC (decl
))
2046 /* Cloned constructors and destructors get the same visibility as
2047 the underlying function. That should be set up in
2048 maybe_clone_body. */
2049 gcc_assert (!DECL_CLONED_FUNCTION_P (decl
));
2051 orig_visibility_specified
= DECL_VISIBILITY_SPECIFIED (decl
);
2052 orig_visibility
= DECL_VISIBILITY (decl
);
2054 if (TREE_CODE (decl
) == TYPE_DECL
)
2056 if (CLASS_TYPE_P (TREE_TYPE (decl
)))
2057 use_template
= CLASSTYPE_USE_TEMPLATE (TREE_TYPE (decl
));
2058 else if (TYPE_TEMPLATE_INFO (TREE_TYPE (decl
)))
2063 else if (DECL_LANG_SPECIFIC (decl
))
2064 use_template
= DECL_USE_TEMPLATE (decl
);
2068 /* If DECL is a member of a class, visibility specifiers on the
2069 class can influence the visibility of the DECL. */
2070 if (DECL_CLASS_SCOPE_P (decl
))
2071 class_type
= DECL_CONTEXT (decl
);
2074 /* Not a class member. */
2076 /* Virtual tables have DECL_CONTEXT set to their associated class,
2077 so they are automatically handled above. */
2078 gcc_assert (TREE_CODE (decl
) != VAR_DECL
2079 || !DECL_VTABLE_OR_VTT_P (decl
));
2081 if (DECL_FUNCTION_SCOPE_P (decl
) && ! DECL_VISIBILITY_SPECIFIED (decl
))
2083 /* Local statics and classes get the visibility of their
2084 containing function by default, except that
2085 -fvisibility-inlines-hidden doesn't affect them. */
2086 tree fn
= DECL_CONTEXT (decl
);
2087 if (DECL_VISIBILITY_SPECIFIED (fn
))
2089 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
2090 DECL_VISIBILITY_SPECIFIED (decl
) =
2091 DECL_VISIBILITY_SPECIFIED (fn
);
2095 if (DECL_CLASS_SCOPE_P (fn
))
2096 determine_visibility_from_class (decl
, DECL_CONTEXT (fn
));
2097 else if (determine_hidden_inline (fn
))
2099 DECL_VISIBILITY (decl
) = default_visibility
;
2100 DECL_VISIBILITY_SPECIFIED (decl
) =
2101 visibility_options
.inpragma
;
2105 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (fn
);
2106 DECL_VISIBILITY_SPECIFIED (decl
) =
2107 DECL_VISIBILITY_SPECIFIED (fn
);
2111 /* Local classes in templates have CLASSTYPE_USE_TEMPLATE set,
2112 but have no TEMPLATE_INFO, so don't try to check it. */
2115 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
)
2116 && flag_visibility_ms_compat
)
2118 /* Under -fvisibility-ms-compat, types are visible by default,
2119 even though their contents aren't. */
2120 tree underlying_type
= TREE_TYPE (DECL_NAME (decl
));
2121 int underlying_vis
= type_visibility (underlying_type
);
2122 if (underlying_vis
== VISIBILITY_ANON
2123 || (CLASS_TYPE_P (underlying_type
)
2124 && CLASSTYPE_VISIBILITY_SPECIFIED (underlying_type
)))
2125 constrain_visibility (decl
, underlying_vis
, false);
2127 DECL_VISIBILITY (decl
) = VISIBILITY_DEFAULT
;
2129 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
2131 /* tinfo visibility is based on the type it's for. */
2132 constrain_visibility
2133 (decl
, type_visibility (TREE_TYPE (DECL_NAME (decl
))), false);
2135 /* Give the target a chance to override the visibility associated
2137 if (TREE_PUBLIC (decl
)
2138 && !DECL_REALLY_EXTERN (decl
)
2139 && CLASS_TYPE_P (TREE_TYPE (DECL_NAME (decl
)))
2140 && !CLASSTYPE_VISIBILITY_SPECIFIED (TREE_TYPE (DECL_NAME (decl
))))
2141 targetm
.cxx
.determine_class_data_visibility (decl
);
2143 else if (use_template
)
2144 /* Template instantiations and specializations get visibility based
2145 on their template unless they override it with an attribute. */;
2146 else if (! DECL_VISIBILITY_SPECIFIED (decl
))
2148 if (determine_hidden_inline (decl
))
2149 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2152 /* Set default visibility to whatever the user supplied with
2153 #pragma GCC visibility or a namespace visibility attribute. */
2154 DECL_VISIBILITY (decl
) = default_visibility
;
2155 DECL_VISIBILITY_SPECIFIED (decl
) = visibility_options
.inpragma
;
2162 /* If the specialization doesn't specify visibility, use the
2163 visibility from the template. */
2164 tree tinfo
= (TREE_CODE (decl
) == TYPE_DECL
2165 ? TYPE_TEMPLATE_INFO (TREE_TYPE (decl
))
2166 : DECL_TEMPLATE_INFO (decl
));
2167 tree args
= TI_ARGS (tinfo
);
2168 tree attribs
= (TREE_CODE (decl
) == TYPE_DECL
2169 ? TYPE_ATTRIBUTES (TREE_TYPE (decl
))
2170 : DECL_ATTRIBUTES (decl
));
2172 if (args
!= error_mark_node
)
2174 tree pattern
= DECL_TEMPLATE_RESULT (TI_TEMPLATE (tinfo
));
2176 if (!DECL_VISIBILITY_SPECIFIED (decl
))
2178 if (!DECL_VISIBILITY_SPECIFIED (pattern
)
2179 && determine_hidden_inline (decl
))
2180 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2183 DECL_VISIBILITY (decl
) = DECL_VISIBILITY (pattern
);
2184 DECL_VISIBILITY_SPECIFIED (decl
)
2185 = DECL_VISIBILITY_SPECIFIED (pattern
);
2190 /* Template argument visibility outweighs #pragma or namespace
2191 visibility, but not an explicit attribute. */
2192 && !lookup_attribute ("visibility", attribs
))
2194 int depth
= TMPL_ARGS_DEPTH (args
);
2195 int class_depth
= 0;
2196 if (class_type
&& CLASSTYPE_TEMPLATE_INFO (class_type
))
2197 class_depth
= TMPL_ARGS_DEPTH (CLASSTYPE_TI_ARGS (class_type
));
2198 if (DECL_VISIBILITY_SPECIFIED (decl
))
2200 /* A class template member with explicit visibility
2201 overrides the class visibility, so we need to apply
2202 all the levels of template args directly. */
2204 for (i
= 1; i
<= depth
; ++i
)
2206 tree lev
= TMPL_ARGS_LEVEL (args
, i
);
2207 constrain_visibility_for_template (decl
, lev
);
2210 else if (depth
> class_depth
)
2211 /* Limit visibility based on its template arguments. */
2212 constrain_visibility_for_template (decl
, args
);
2218 determine_visibility_from_class (decl
, class_type
);
2220 if (decl_anon_ns_mem_p (decl
))
2221 /* Names in an anonymous namespace get internal linkage.
2222 This might change once we implement export. */
2223 constrain_visibility (decl
, VISIBILITY_ANON
, false);
2224 else if (TREE_CODE (decl
) != TYPE_DECL
)
2226 /* Propagate anonymity from type to decl. */
2227 int tvis
= type_visibility (TREE_TYPE (decl
));
2228 if (tvis
== VISIBILITY_ANON
2229 || ! DECL_VISIBILITY_SPECIFIED (decl
))
2230 constrain_visibility (decl
, tvis
, false);
2232 else if (no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/true))
2233 /* DR 757: A type without linkage shall not be used as the type of a
2234 variable or function with linkage, unless
2235 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
2236 o the variable or function is not used (3.2 [basic.def.odr]) or is
2237 defined in the same translation unit.
2239 Since non-extern "C" decls need to be defined in the same
2240 translation unit, we can make the type internal. */
2241 constrain_visibility (decl
, VISIBILITY_ANON
, false);
2243 /* If visibility changed and DECL already has DECL_RTL, ensure
2244 symbol flags are updated. */
2245 if ((DECL_VISIBILITY (decl
) != orig_visibility
2246 || DECL_VISIBILITY_SPECIFIED (decl
) != orig_visibility_specified
)
2247 && ((TREE_CODE (decl
) == VAR_DECL
&& TREE_STATIC (decl
))
2248 || TREE_CODE (decl
) == FUNCTION_DECL
)
2249 && DECL_RTL_SET_P (decl
))
2250 make_decl_rtl (decl
);
2253 /* By default, static data members and function members receive
2254 the visibility of their containing class. */
2257 determine_visibility_from_class (tree decl
, tree class_type
)
2259 if (DECL_VISIBILITY_SPECIFIED (decl
))
2262 if (determine_hidden_inline (decl
))
2263 DECL_VISIBILITY (decl
) = VISIBILITY_HIDDEN
;
2266 /* Default to the class visibility. */
2267 DECL_VISIBILITY (decl
) = CLASSTYPE_VISIBILITY (class_type
);
2268 DECL_VISIBILITY_SPECIFIED (decl
)
2269 = CLASSTYPE_VISIBILITY_SPECIFIED (class_type
);
2272 /* Give the target a chance to override the visibility associated
2274 if (TREE_CODE (decl
) == VAR_DECL
2275 && (DECL_TINFO_P (decl
)
2276 || (DECL_VTABLE_OR_VTT_P (decl
)
2277 /* Construction virtual tables are not exported because
2278 they cannot be referred to from other object files;
2279 their name is not standardized by the ABI. */
2280 && !DECL_CONSTRUCTION_VTABLE_P (decl
)))
2281 && TREE_PUBLIC (decl
)
2282 && !DECL_REALLY_EXTERN (decl
)
2283 && !CLASSTYPE_VISIBILITY_SPECIFIED (class_type
))
2284 targetm
.cxx
.determine_class_data_visibility (decl
);
2287 /* Returns true iff DECL is an inline that should get hidden visibility
2288 because of -fvisibility-inlines-hidden. */
2291 determine_hidden_inline (tree decl
)
2293 return (visibility_options
.inlines_hidden
2294 /* Don't do this for inline templates; specializations might not be
2295 inline, and we don't want them to inherit the hidden
2296 visibility. We'll set it here for all inline instantiations. */
2297 && !processing_template_decl
2298 && TREE_CODE (decl
) == FUNCTION_DECL
2299 && DECL_DECLARED_INLINE_P (decl
)
2300 && (! DECL_LANG_SPECIFIC (decl
)
2301 || ! DECL_EXPLICIT_INSTANTIATION (decl
)));
2304 /* Constrain the visibility of a class TYPE based on the visibility of its
2305 field types. Warn if any fields require lesser visibility. */
2308 constrain_class_visibility (tree type
)
2314 int vis
= type_visibility (type
);
2316 if (vis
== VISIBILITY_ANON
2317 || DECL_IN_SYSTEM_HEADER (TYPE_MAIN_DECL (type
)))
2320 /* Don't warn about visibility if the class has explicit visibility. */
2321 if (CLASSTYPE_VISIBILITY_SPECIFIED (type
))
2322 vis
= VISIBILITY_INTERNAL
;
2324 for (t
= TYPE_FIELDS (type
); t
; t
= DECL_CHAIN (t
))
2325 if (TREE_CODE (t
) == FIELD_DECL
&& TREE_TYPE (t
) != error_mark_node
)
2327 tree ftype
= strip_pointer_or_array_types (TREE_TYPE (t
));
2328 int subvis
= type_visibility (ftype
);
2330 if (subvis
== VISIBILITY_ANON
)
2332 if (!in_main_input_context ())
2334 %qT has a field %qD whose type uses the anonymous namespace",
2337 else if (MAYBE_CLASS_TYPE_P (ftype
)
2338 && vis
< VISIBILITY_HIDDEN
2339 && subvis
>= VISIBILITY_HIDDEN
)
2340 warning (OPT_Wattributes
, "\
2341 %qT declared with greater visibility than the type of its field %qD",
2345 binfo
= TYPE_BINFO (type
);
2346 for (i
= 0; BINFO_BASE_ITERATE (binfo
, i
, t
); ++i
)
2348 int subvis
= type_visibility (TREE_TYPE (t
));
2350 if (subvis
== VISIBILITY_ANON
)
2352 if (!in_main_input_context())
2354 %qT has a base %qT whose type uses the anonymous namespace",
2355 type
, TREE_TYPE (t
));
2357 else if (vis
< VISIBILITY_HIDDEN
2358 && subvis
>= VISIBILITY_HIDDEN
)
2359 warning (OPT_Wattributes
, "\
2360 %qT declared with greater visibility than its base %qT",
2361 type
, TREE_TYPE (t
));
2365 /* DECL is a FUNCTION_DECL or VAR_DECL. If the object file linkage
2366 for DECL has not already been determined, do so now by setting
2367 DECL_EXTERNAL, DECL_COMDAT and other related flags. Until this
2368 function is called entities with vague linkage whose definitions
2369 are available must have TREE_PUBLIC set.
2371 If this function decides to place DECL in COMDAT, it will set
2372 appropriate flags -- but will not clear DECL_EXTERNAL. It is up to
2373 the caller to decide whether or not to clear DECL_EXTERNAL. Some
2374 callers defer that decision until it is clear that DECL is actually
2378 import_export_decl (tree decl
)
2383 tree class_type
= NULL_TREE
;
2385 if (DECL_INTERFACE_KNOWN (decl
))
2388 /* We cannot determine what linkage to give to an entity with vague
2389 linkage until the end of the file. For example, a virtual table
2390 for a class will be defined if and only if the key method is
2391 defined in this translation unit. As a further example, consider
2392 that when compiling a translation unit that uses PCH file with
2393 "-frepo" it would be incorrect to make decisions about what
2394 entities to emit when building the PCH; those decisions must be
2395 delayed until the repository information has been processed. */
2396 gcc_assert (at_eof
);
2397 /* Object file linkage for explicit instantiations is handled in
2398 mark_decl_instantiated. For static variables in functions with
2399 vague linkage, maybe_commonize_var is used.
2401 Therefore, the only declarations that should be provided to this
2402 function are those with external linkage that are:
2404 * implicit instantiations of function templates
2408 * implicit instantiations of static data members of class
2415 Furthermore, all entities that reach this point must have a
2416 definition available in this translation unit.
2418 The following assertions check these conditions. */
2419 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
2420 || TREE_CODE (decl
) == VAR_DECL
);
2421 /* Any code that creates entities with TREE_PUBLIC cleared should
2422 also set DECL_INTERFACE_KNOWN. */
2423 gcc_assert (TREE_PUBLIC (decl
));
2424 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2425 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2426 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
)
2427 || DECL_DECLARED_INLINE_P (decl
));
2429 gcc_assert (DECL_IMPLICIT_INSTANTIATION (decl
)
2430 || DECL_VTABLE_OR_VTT_P (decl
)
2431 || DECL_TINFO_P (decl
));
2432 /* Check that a definition of DECL is available in this translation
2434 gcc_assert (!DECL_REALLY_EXTERN (decl
));
2436 /* Assume that DECL will not have COMDAT linkage. */
2438 /* Assume that DECL will not be imported into this translation
2442 /* See if the repository tells us whether or not to emit DECL in
2443 this translation unit. */
2444 emit_p
= repo_emit_p (decl
);
2447 else if (emit_p
== 1)
2449 /* The repository indicates that this entity should be defined
2450 here. Make sure the back end honors that request. */
2451 if (TREE_CODE (decl
) == VAR_DECL
)
2453 else if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl
)
2454 || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl
))
2457 FOR_EACH_CLONE (clone
, decl
)
2458 mark_needed (clone
);
2462 /* Output the definition as an ordinary strong definition. */
2463 DECL_EXTERNAL (decl
) = 0;
2464 DECL_INTERFACE_KNOWN (decl
) = 1;
2469 /* We have already decided what to do with this DECL; there is no
2470 need to check anything further. */
2472 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_VTABLE_OR_VTT_P (decl
))
2474 class_type
= DECL_CONTEXT (decl
);
2475 import_export_class (class_type
);
2476 if (TYPE_FOR_JAVA (class_type
))
2478 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
)
2479 && CLASSTYPE_INTERFACE_ONLY (class_type
))
2481 else if ((!flag_weak
|| TARGET_WEAK_NOT_IN_ARCHIVE_TOC
)
2482 && !CLASSTYPE_USE_TEMPLATE (class_type
)
2483 && CLASSTYPE_KEY_METHOD (class_type
)
2484 && !DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
)))
2485 /* The ABI requires that all virtual tables be emitted with
2486 COMDAT linkage. However, on systems where COMDAT symbols
2487 don't show up in the table of contents for a static
2488 archive, or on systems without weak symbols (where we
2489 approximate COMDAT linkage by using internal linkage), the
2490 linker will report errors about undefined symbols because
2491 it will not see the virtual table definition. Therefore,
2492 in the case that we know that the virtual table will be
2493 emitted in only one translation unit, we make the virtual
2494 table an ordinary definition with external linkage. */
2495 DECL_EXTERNAL (decl
) = 0;
2496 else if (CLASSTYPE_INTERFACE_KNOWN (class_type
))
2498 /* CLASS_TYPE is being exported from this translation unit,
2499 so DECL should be defined here. */
2500 if (!flag_weak
&& CLASSTYPE_EXPLICIT_INSTANTIATION (class_type
))
2501 /* If a class is declared in a header with the "extern
2502 template" extension, then it will not be instantiated,
2503 even in translation units that would normally require
2504 it. Often such classes are explicitly instantiated in
2505 one translation unit. Therefore, the explicit
2506 instantiation must be made visible to other translation
2508 DECL_EXTERNAL (decl
) = 0;
2511 /* The generic C++ ABI says that class data is always
2512 COMDAT, even if there is a key function. Some
2513 variants (e.g., the ARM EABI) says that class data
2514 only has COMDAT linkage if the class data might be
2515 emitted in more than one translation unit. When the
2516 key method can be inline and is inline, we still have
2517 to arrange for comdat even though
2518 class_data_always_comdat is false. */
2519 if (!CLASSTYPE_KEY_METHOD (class_type
)
2520 || DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (class_type
))
2521 || targetm
.cxx
.class_data_always_comdat ())
2523 /* The ABI requires COMDAT linkage. Normally, we
2524 only emit COMDAT things when they are needed;
2525 make sure that we realize that this entity is
2532 else if (!flag_implicit_templates
2533 && CLASSTYPE_IMPLICIT_INSTANTIATION (class_type
))
2538 else if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TINFO_P (decl
))
2540 tree type
= TREE_TYPE (DECL_NAME (decl
));
2541 if (CLASS_TYPE_P (type
))
2544 import_export_class (type
);
2545 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2546 && TYPE_POLYMORPHIC_P (type
)
2547 && CLASSTYPE_INTERFACE_ONLY (type
)
2548 /* If -fno-rtti was specified, then we cannot be sure
2549 that RTTI information will be emitted with the
2550 virtual table of the class, so we must emit it
2551 wherever it is used. */
2556 if (CLASSTYPE_INTERFACE_KNOWN (type
)
2557 && !CLASSTYPE_INTERFACE_ONLY (type
))
2559 comdat_p
= (targetm
.cxx
.class_data_always_comdat ()
2560 || (CLASSTYPE_KEY_METHOD (type
)
2561 && DECL_DECLARED_INLINE_P (CLASSTYPE_KEY_METHOD (type
))));
2566 DECL_EXTERNAL (decl
) = 0;
2576 else if (DECL_TEMPLATE_INSTANTIATION (decl
)
2577 || DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION (decl
))
2579 /* DECL is an implicit instantiation of a function or static
2581 if ((flag_implicit_templates
2582 && !flag_use_repository
)
2583 || (flag_implicit_inline_templates
2584 && TREE_CODE (decl
) == FUNCTION_DECL
2585 && DECL_DECLARED_INLINE_P (decl
)))
2588 /* If we are not implicitly generating templates, then mark
2589 this entity as undefined in this translation unit. */
2592 else if (DECL_FUNCTION_MEMBER_P (decl
))
2594 if (!DECL_DECLARED_INLINE_P (decl
))
2596 tree ctype
= DECL_CONTEXT (decl
);
2597 import_export_class (ctype
);
2598 if (CLASSTYPE_INTERFACE_KNOWN (ctype
))
2600 DECL_NOT_REALLY_EXTERN (decl
)
2601 = ! (CLASSTYPE_INTERFACE_ONLY (ctype
)
2602 || (DECL_DECLARED_INLINE_P (decl
)
2603 && ! flag_implement_inlines
2604 && !DECL_VINDEX (decl
)));
2606 if (!DECL_NOT_REALLY_EXTERN (decl
))
2607 DECL_EXTERNAL (decl
) = 1;
2609 /* Always make artificials weak. */
2610 if (DECL_ARTIFICIAL (decl
) && flag_weak
)
2613 maybe_make_one_only (decl
);
2624 /* If we are importing DECL into this translation unit, mark is
2625 an undefined here. */
2626 DECL_EXTERNAL (decl
) = 1;
2627 DECL_NOT_REALLY_EXTERN (decl
) = 0;
2631 /* If we decided to put DECL in COMDAT, mark it accordingly at
2633 comdat_linkage (decl
);
2636 DECL_INTERFACE_KNOWN (decl
) = 1;
2639 /* Return an expression that performs the destruction of DECL, which
2640 must be a VAR_DECL whose type has a non-trivial destructor, or is
2641 an array whose (innermost) elements have a non-trivial destructor. */
2644 build_cleanup (tree decl
)
2647 tree type
= TREE_TYPE (decl
);
2649 /* This function should only be called for declarations that really
2650 require cleanups. */
2651 gcc_assert (!TYPE_HAS_TRIVIAL_DESTRUCTOR (type
));
2653 /* Treat all objects with destructors as used; the destructor may do
2654 something substantive. */
2657 if (TREE_CODE (type
) == ARRAY_TYPE
)
2660 temp
= build_address (decl
);
2661 temp
= build_delete (TREE_TYPE (temp
), temp
,
2662 sfk_complete_destructor
,
2663 LOOKUP_NORMAL
|LOOKUP_NONVIRTUAL
|LOOKUP_DESTRUCTOR
, 0,
2664 tf_warning_or_error
);
2668 /* Returns the initialization guard variable for the variable DECL,
2669 which has static storage duration. */
2672 get_guard (tree decl
)
2677 sname
= mangle_guard_variable (decl
);
2678 guard
= IDENTIFIER_GLOBAL_VALUE (sname
);
2683 /* We use a type that is big enough to contain a mutex as well
2684 as an integer counter. */
2685 guard_type
= targetm
.cxx
.guard_type ();
2686 guard
= build_decl (DECL_SOURCE_LOCATION (decl
),
2687 VAR_DECL
, sname
, guard_type
);
2689 /* The guard should have the same linkage as what it guards. */
2690 TREE_PUBLIC (guard
) = TREE_PUBLIC (decl
);
2691 TREE_STATIC (guard
) = TREE_STATIC (decl
);
2692 DECL_COMMON (guard
) = DECL_COMMON (decl
);
2693 DECL_COMDAT (guard
) = DECL_COMDAT (decl
);
2694 if (DECL_ONE_ONLY (decl
))
2695 make_decl_one_only (guard
, cxx_comdat_group (guard
));
2696 if (TREE_PUBLIC (decl
))
2697 DECL_WEAK (guard
) = DECL_WEAK (decl
);
2698 DECL_VISIBILITY (guard
) = DECL_VISIBILITY (decl
);
2699 DECL_VISIBILITY_SPECIFIED (guard
) = DECL_VISIBILITY_SPECIFIED (decl
);
2701 DECL_ARTIFICIAL (guard
) = 1;
2702 DECL_IGNORED_P (guard
) = 1;
2703 TREE_USED (guard
) = 1;
2704 pushdecl_top_level_and_finish (guard
, NULL_TREE
);
2709 /* Return those bits of the GUARD variable that should be set when the
2710 guarded entity is actually initialized. */
2713 get_guard_bits (tree guard
)
2715 if (!targetm
.cxx
.guard_mask_bit ())
2717 /* We only set the first byte of the guard, in order to leave room
2718 for a mutex in the high-order bits. */
2719 guard
= build1 (ADDR_EXPR
,
2720 build_pointer_type (TREE_TYPE (guard
)),
2722 guard
= build1 (NOP_EXPR
,
2723 build_pointer_type (char_type_node
),
2725 guard
= build1 (INDIRECT_REF
, char_type_node
, guard
);
2731 /* Return an expression which determines whether or not the GUARD
2732 variable has already been initialized. */
2735 get_guard_cond (tree guard
)
2739 /* Check to see if the GUARD is zero. */
2740 guard
= get_guard_bits (guard
);
2742 /* Mask off all but the low bit. */
2743 if (targetm
.cxx
.guard_mask_bit ())
2745 guard_value
= integer_one_node
;
2746 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2747 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2748 guard
= cp_build_binary_op (input_location
,
2749 BIT_AND_EXPR
, guard
, guard_value
,
2750 tf_warning_or_error
);
2753 guard_value
= integer_zero_node
;
2754 if (!same_type_p (TREE_TYPE (guard_value
), TREE_TYPE (guard
)))
2755 guard_value
= convert (TREE_TYPE (guard
), guard_value
);
2756 return cp_build_binary_op (input_location
,
2757 EQ_EXPR
, guard
, guard_value
,
2758 tf_warning_or_error
);
2761 /* Return an expression which sets the GUARD variable, indicating that
2762 the variable being guarded has been initialized. */
2765 set_guard (tree guard
)
2769 /* Set the GUARD to one. */
2770 guard
= get_guard_bits (guard
);
2771 guard_init
= integer_one_node
;
2772 if (!same_type_p (TREE_TYPE (guard_init
), TREE_TYPE (guard
)))
2773 guard_init
= convert (TREE_TYPE (guard
), guard_init
);
2774 return cp_build_modify_expr (guard
, NOP_EXPR
, guard_init
,
2775 tf_warning_or_error
);
2778 /* Start the process of running a particular set of global constructors
2779 or destructors. Subroutine of do_[cd]tors. */
2782 start_objects (int method_type
, int initp
)
2788 /* Make ctor or dtor function. METHOD_TYPE may be 'I' or 'D'. */
2790 if (initp
!= DEFAULT_INIT_PRIORITY
)
2800 sprintf (type
, "sub_%c%c%.5u", method_type
, joiner
, initp
);
2803 sprintf (type
, "sub_%c", method_type
);
2805 fndecl
= build_lang_decl (FUNCTION_DECL
,
2806 get_file_function_name (type
),
2807 build_function_type_list (void_type_node
,
2809 start_preparsed_function (fndecl
, /*attrs=*/NULL_TREE
, SF_PRE_PARSED
);
2811 TREE_PUBLIC (current_function_decl
) = 0;
2813 /* Mark as artificial because it's not explicitly in the user's
2815 DECL_ARTIFICIAL (current_function_decl
) = 1;
2817 /* Mark this declaration as used to avoid spurious warnings. */
2818 TREE_USED (current_function_decl
) = 1;
2820 /* Mark this function as a global constructor or destructor. */
2821 if (method_type
== 'I')
2822 DECL_GLOBAL_CTOR_P (current_function_decl
) = 1;
2824 DECL_GLOBAL_DTOR_P (current_function_decl
) = 1;
2826 body
= begin_compound_stmt (BCS_FN_BODY
);
2831 /* Finish the process of running a particular set of global constructors
2832 or destructors. Subroutine of do_[cd]tors. */
2835 finish_objects (int method_type
, int initp
, tree body
)
2840 finish_compound_stmt (body
);
2841 fn
= finish_function (0);
2843 if (method_type
== 'I')
2845 DECL_STATIC_CONSTRUCTOR (fn
) = 1;
2846 decl_init_priority_insert (fn
, initp
);
2850 DECL_STATIC_DESTRUCTOR (fn
) = 1;
2851 decl_fini_priority_insert (fn
, initp
);
2854 expand_or_defer_fn (fn
);
2857 /* The names of the parameters to the function created to handle
2858 initializations and destructions for objects with static storage
2860 #define INITIALIZE_P_IDENTIFIER "__initialize_p"
2861 #define PRIORITY_IDENTIFIER "__priority"
2863 /* The name of the function we create to handle initializations and
2864 destructions for objects with static storage duration. */
2865 #define SSDF_IDENTIFIER "__static_initialization_and_destruction"
2867 /* The declaration for the __INITIALIZE_P argument. */
2868 static GTY(()) tree initialize_p_decl
;
2870 /* The declaration for the __PRIORITY argument. */
2871 static GTY(()) tree priority_decl
;
2873 /* The declaration for the static storage duration function. */
2874 static GTY(()) tree ssdf_decl
;
2876 /* All the static storage duration functions created in this
2877 translation unit. */
2878 static GTY(()) VEC(tree
,gc
) *ssdf_decls
;
2880 /* A map from priority levels to information about that priority
2881 level. There may be many such levels, so efficient lookup is
2883 static splay_tree priority_info_map
;
2885 /* Begins the generation of the function that will handle all
2886 initialization and destruction of objects with static storage
2887 duration. The function generated takes two parameters of type
2888 `int': __INITIALIZE_P and __PRIORITY. If __INITIALIZE_P is
2889 nonzero, it performs initializations. Otherwise, it performs
2890 destructions. It only performs those initializations or
2891 destructions with the indicated __PRIORITY. The generated function
2894 It is assumed that this function will only be called once per
2895 translation unit. */
2898 start_static_storage_duration_function (unsigned count
)
2902 char id
[sizeof (SSDF_IDENTIFIER
) + 1 /* '\0' */ + 32];
2904 /* Create the identifier for this function. It will be of the form
2905 SSDF_IDENTIFIER_<number>. */
2906 sprintf (id
, "%s_%u", SSDF_IDENTIFIER
, count
);
2908 type
= build_function_type_list (void_type_node
,
2909 integer_type_node
, integer_type_node
,
2912 /* Create the FUNCTION_DECL itself. */
2913 ssdf_decl
= build_lang_decl (FUNCTION_DECL
,
2914 get_identifier (id
),
2916 TREE_PUBLIC (ssdf_decl
) = 0;
2917 DECL_ARTIFICIAL (ssdf_decl
) = 1;
2919 /* Put this function in the list of functions to be called from the
2920 static constructors and destructors. */
2923 ssdf_decls
= VEC_alloc (tree
, gc
, 32);
2925 /* Take this opportunity to initialize the map from priority
2926 numbers to information about that priority level. */
2927 priority_info_map
= splay_tree_new (splay_tree_compare_ints
,
2928 /*delete_key_fn=*/0,
2929 /*delete_value_fn=*/
2930 (splay_tree_delete_value_fn
) &free
);
2932 /* We always need to generate functions for the
2933 DEFAULT_INIT_PRIORITY so enter it now. That way when we walk
2934 priorities later, we'll be sure to find the
2935 DEFAULT_INIT_PRIORITY. */
2936 get_priority_info (DEFAULT_INIT_PRIORITY
);
2939 VEC_safe_push (tree
, gc
, ssdf_decls
, ssdf_decl
);
2941 /* Create the argument list. */
2942 initialize_p_decl
= cp_build_parm_decl
2943 (get_identifier (INITIALIZE_P_IDENTIFIER
), integer_type_node
);
2944 DECL_CONTEXT (initialize_p_decl
) = ssdf_decl
;
2945 TREE_USED (initialize_p_decl
) = 1;
2946 priority_decl
= cp_build_parm_decl
2947 (get_identifier (PRIORITY_IDENTIFIER
), integer_type_node
);
2948 DECL_CONTEXT (priority_decl
) = ssdf_decl
;
2949 TREE_USED (priority_decl
) = 1;
2951 DECL_CHAIN (initialize_p_decl
) = priority_decl
;
2952 DECL_ARGUMENTS (ssdf_decl
) = initialize_p_decl
;
2954 /* Put the function in the global scope. */
2955 pushdecl (ssdf_decl
);
2957 /* Start the function itself. This is equivalent to declaring the
2960 static void __ssdf (int __initialize_p, init __priority_p);
2962 It is static because we only need to call this function from the
2963 various constructor and destructor functions for this module. */
2964 start_preparsed_function (ssdf_decl
,
2965 /*attrs=*/NULL_TREE
,
2968 /* Set up the scope of the outermost block in the function. */
2969 body
= begin_compound_stmt (BCS_FN_BODY
);
2974 /* Finish the generation of the function which performs initialization
2975 and destruction of objects with static storage duration. After
2976 this point, no more such objects can be created. */
2979 finish_static_storage_duration_function (tree body
)
2981 /* Close out the function. */
2982 finish_compound_stmt (body
);
2983 expand_or_defer_fn (finish_function (0));
2986 /* Return the information about the indicated PRIORITY level. If no
2987 code to handle this level has yet been generated, generate the
2988 appropriate prologue. */
2990 static priority_info
2991 get_priority_info (int priority
)
2996 n
= splay_tree_lookup (priority_info_map
,
2997 (splay_tree_key
) priority
);
3000 /* Create a new priority information structure, and insert it
3002 pi
= XNEW (struct priority_info_s
);
3003 pi
->initializations_p
= 0;
3004 pi
->destructions_p
= 0;
3005 splay_tree_insert (priority_info_map
,
3006 (splay_tree_key
) priority
,
3007 (splay_tree_value
) pi
);
3010 pi
= (priority_info
) n
->value
;
3015 /* The effective initialization priority of a DECL. */
3017 #define DECL_EFFECTIVE_INIT_PRIORITY(decl) \
3018 ((!DECL_HAS_INIT_PRIORITY_P (decl) || DECL_INIT_PRIORITY (decl) == 0) \
3019 ? DEFAULT_INIT_PRIORITY : DECL_INIT_PRIORITY (decl))
3021 /* Whether a DECL needs a guard to protect it against multiple
3024 #define NEEDS_GUARD_P(decl) (TREE_PUBLIC (decl) && (DECL_COMMON (decl) \
3025 || DECL_ONE_ONLY (decl) \
3026 || DECL_WEAK (decl)))
3028 /* Called from one_static_initialization_or_destruction(),
3030 Walks the initializer list of a global variable and looks for
3031 temporary variables (DECL_NAME() == NULL and DECL_ARTIFICIAL != 0)
3032 and that have their DECL_CONTEXT() == NULL.
3033 For each such temporary variable, set their DECL_CONTEXT() to
3034 the current function. This is necessary because otherwise
3035 some optimizers (enabled by -O2 -fprofile-arcs) might crash
3036 when trying to refer to a temporary variable that does not have
3037 it's DECL_CONTECT() properly set. */
3039 fix_temporary_vars_context_r (tree
*node
,
3040 int *unused ATTRIBUTE_UNUSED
,
3041 void *unused1 ATTRIBUTE_UNUSED
)
3043 gcc_assert (current_function_decl
);
3045 if (TREE_CODE (*node
) == BIND_EXPR
)
3049 for (var
= BIND_EXPR_VARS (*node
); var
; var
= DECL_CHAIN (var
))
3050 if (TREE_CODE (var
) == VAR_DECL
3052 && DECL_ARTIFICIAL (var
)
3053 && !DECL_CONTEXT (var
))
3054 DECL_CONTEXT (var
) = current_function_decl
;
3060 /* Set up to handle the initialization or destruction of DECL. If
3061 INITP is nonzero, we are initializing the variable. Otherwise, we
3062 are destroying it. */
3065 one_static_initialization_or_destruction (tree decl
, tree init
, bool initp
)
3067 tree guard_if_stmt
= NULL_TREE
;
3070 /* If we are supposed to destruct and there's a trivial destructor,
3071 nothing has to be done. */
3073 && TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3076 /* Trick the compiler into thinking we are at the file and line
3077 where DECL was declared so that error-messages make sense, and so
3078 that the debugger will show somewhat sensible file and line
3080 input_location
= DECL_SOURCE_LOCATION (decl
);
3082 /* Make sure temporary variables in the initialiser all have
3083 their DECL_CONTEXT() set to a value different from NULL_TREE.
3084 This can happen when global variables initialisers are built.
3085 In that case, the DECL_CONTEXT() of the global variables _AND_ of all
3086 the temporary variables that might have been generated in the
3087 accompagning initialisers is NULL_TREE, meaning the variables have been
3088 declared in the global namespace.
3089 What we want to do here is to fix that and make sure the DECL_CONTEXT()
3090 of the temporaries are set to the current function decl. */
3091 cp_walk_tree_without_duplicates (&init
,
3092 fix_temporary_vars_context_r
,
3099 Access control for implicit calls to the constructors,
3100 the conversion functions, or the destructor called to
3101 create and destroy a static data member is performed as
3102 if these calls appeared in the scope of the member's
3105 we pretend we are in a static member function of the class of
3106 which the DECL is a member. */
3107 if (member_p (decl
))
3109 DECL_CONTEXT (current_function_decl
) = DECL_CONTEXT (decl
);
3110 DECL_STATIC_FUNCTION_P (current_function_decl
) = 1;
3113 /* Assume we don't need a guard. */
3115 /* We need a guard if this is an object with external linkage that
3116 might be initialized in more than one place. (For example, a
3117 static data member of a template, when the data member requires
3119 if (NEEDS_GUARD_P (decl
))
3123 guard
= get_guard (decl
);
3125 /* When using __cxa_atexit, we just check the GUARD as we would
3126 for a local static. */
3127 if (flag_use_cxa_atexit
)
3129 /* When using __cxa_atexit, we never try to destroy
3130 anything from a static destructor. */
3132 guard_cond
= get_guard_cond (guard
);
3134 /* If we don't have __cxa_atexit, then we will be running
3135 destructors from .fini sections, or their equivalents. So,
3136 we need to know how many times we've tried to initialize this
3137 object. We do initializations only if the GUARD is zero,
3138 i.e., if we are the first to initialize the variable. We do
3139 destructions only if the GUARD is one, i.e., if we are the
3140 last to destroy the variable. */
3143 = cp_build_binary_op (input_location
,
3145 cp_build_unary_op (PREINCREMENT_EXPR
,
3148 tf_warning_or_error
),
3150 tf_warning_or_error
);
3153 = cp_build_binary_op (input_location
,
3155 cp_build_unary_op (PREDECREMENT_EXPR
,
3158 tf_warning_or_error
),
3160 tf_warning_or_error
);
3162 guard_if_stmt
= begin_if_stmt ();
3163 finish_if_stmt_cond (guard_cond
, guard_if_stmt
);
3167 /* If we're using __cxa_atexit, we have not already set the GUARD,
3168 so we must do so now. */
3169 if (guard
&& initp
&& flag_use_cxa_atexit
)
3170 finish_expr_stmt (set_guard (guard
));
3172 /* Perform the initialization or destruction. */
3176 finish_expr_stmt (init
);
3178 /* If we're using __cxa_atexit, register a function that calls the
3179 destructor for the object. */
3180 if (flag_use_cxa_atexit
)
3181 finish_expr_stmt (register_dtor_fn (decl
));
3184 finish_expr_stmt (build_cleanup (decl
));
3186 /* Finish the guard if-stmt, if necessary. */
3189 finish_then_clause (guard_if_stmt
);
3190 finish_if_stmt (guard_if_stmt
);
3193 /* Now that we're done with DECL we don't need to pretend to be a
3194 member of its class any longer. */
3195 DECL_CONTEXT (current_function_decl
) = NULL_TREE
;
3196 DECL_STATIC_FUNCTION_P (current_function_decl
) = 0;
3199 /* Generate code to do the initialization or destruction of the decls in VARS,
3200 a TREE_LIST of VAR_DECL with static storage duration.
3201 Whether initialization or destruction is performed is specified by INITP. */
3204 do_static_initialization_or_destruction (tree vars
, bool initp
)
3206 tree node
, init_if_stmt
, cond
;
3208 /* Build the outer if-stmt to check for initialization or destruction. */
3209 init_if_stmt
= begin_if_stmt ();
3210 cond
= initp
? integer_one_node
: integer_zero_node
;
3211 cond
= cp_build_binary_op (input_location
,
3215 tf_warning_or_error
);
3216 finish_if_stmt_cond (cond
, init_if_stmt
);
3220 tree decl
= TREE_VALUE (node
);
3221 tree priority_if_stmt
;
3225 /* If we don't need a destructor, there's nothing to do. Avoid
3226 creating a possibly empty if-stmt. */
3227 if (!initp
&& TYPE_HAS_TRIVIAL_DESTRUCTOR (TREE_TYPE (decl
)))
3229 node
= TREE_CHAIN (node
);
3233 /* Remember that we had an initialization or finalization at this
3235 priority
= DECL_EFFECTIVE_INIT_PRIORITY (decl
);
3236 pi
= get_priority_info (priority
);
3238 pi
->initializations_p
= 1;
3240 pi
->destructions_p
= 1;
3242 /* Conditionalize this initialization on being in the right priority
3243 and being initializing/finalizing appropriately. */
3244 priority_if_stmt
= begin_if_stmt ();
3245 cond
= cp_build_binary_op (input_location
,
3248 build_int_cst (NULL_TREE
, priority
),
3249 tf_warning_or_error
);
3250 finish_if_stmt_cond (cond
, priority_if_stmt
);
3252 /* Process initializers with same priority. */
3254 && DECL_EFFECTIVE_INIT_PRIORITY (TREE_VALUE (node
)) == priority
;
3255 node
= TREE_CHAIN (node
))
3256 /* Do one initialization or destruction. */
3257 one_static_initialization_or_destruction (TREE_VALUE (node
),
3258 TREE_PURPOSE (node
), initp
);
3260 /* Finish up the priority if-stmt body. */
3261 finish_then_clause (priority_if_stmt
);
3262 finish_if_stmt (priority_if_stmt
);
3266 /* Finish up the init/destruct if-stmt body. */
3267 finish_then_clause (init_if_stmt
);
3268 finish_if_stmt (init_if_stmt
);
3271 /* VARS is a list of variables with static storage duration which may
3272 need initialization and/or finalization. Remove those variables
3273 that don't really need to be initialized or finalized, and return
3274 the resulting list. The order in which the variables appear in
3275 VARS is in reverse order of the order in which they should actually
3276 be initialized. The list we return is in the unreversed order;
3277 i.e., the first variable should be initialized first. */
3280 prune_vars_needing_no_initialization (tree
*vars
)
3283 tree result
= NULL_TREE
;
3288 tree decl
= TREE_VALUE (t
);
3289 tree init
= TREE_PURPOSE (t
);
3291 /* Deal gracefully with error. */
3292 if (decl
== error_mark_node
)
3294 var
= &TREE_CHAIN (t
);
3298 /* The only things that can be initialized are variables. */
3299 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
3301 /* If this object is not defined, we don't need to do anything
3303 if (DECL_EXTERNAL (decl
))
3305 var
= &TREE_CHAIN (t
);
3309 /* Also, if the initializer already contains errors, we can bail
3311 if (init
&& TREE_CODE (init
) == TREE_LIST
3312 && value_member (error_mark_node
, init
))
3314 var
= &TREE_CHAIN (t
);
3318 /* This variable is going to need initialization and/or
3319 finalization, so we add it to the list. */
3320 *var
= TREE_CHAIN (t
);
3321 TREE_CHAIN (t
) = result
;
3328 /* Make sure we have told the back end about all the variables in
3332 write_out_vars (tree vars
)
3336 for (v
= vars
; v
; v
= TREE_CHAIN (v
))
3338 tree var
= TREE_VALUE (v
);
3339 if (!var_finalized_p (var
))
3341 import_export_decl (var
);
3342 rest_of_decl_compilation (var
, 1, 1);
3347 /* Generate a static constructor (if CONSTRUCTOR_P) or destructor
3348 (otherwise) that will initialize all global objects with static
3349 storage duration having the indicated PRIORITY. */
3352 generate_ctor_or_dtor_function (bool constructor_p
, int priority
,
3360 input_location
= *locus
;
3362 /* Was: locus->line++; */
3364 /* We use `I' to indicate initialization and `D' to indicate
3366 function_key
= constructor_p
? 'I' : 'D';
3368 /* We emit the function lazily, to avoid generating empty
3369 global constructors and destructors. */
3372 /* For Objective-C++, we may need to initialize metadata found in this module.
3373 This must be done _before_ any other static initializations. */
3374 if (c_dialect_objc () && (priority
== DEFAULT_INIT_PRIORITY
)
3375 && constructor_p
&& objc_static_init_needed_p ())
3377 body
= start_objects (function_key
, priority
);
3378 objc_generate_static_init_call (NULL_TREE
);
3381 /* Call the static storage duration function with appropriate
3383 FOR_EACH_VEC_ELT (tree
, ssdf_decls
, i
, fndecl
)
3385 /* Calls to pure or const functions will expand to nothing. */
3386 if (! (flags_from_decl_or_type (fndecl
) & (ECF_CONST
| ECF_PURE
)))
3391 body
= start_objects (function_key
, priority
);
3393 call
= cp_build_function_call_nary (fndecl
, tf_warning_or_error
,
3394 build_int_cst (NULL_TREE
,
3396 build_int_cst (NULL_TREE
,
3399 finish_expr_stmt (call
);
3403 /* Close out the function. */
3405 finish_objects (function_key
, priority
, body
);
3408 /* Generate constructor and destructor functions for the priority
3412 generate_ctor_and_dtor_functions_for_priority (splay_tree_node n
, void * data
)
3414 location_t
*locus
= (location_t
*) data
;
3415 int priority
= (int) n
->key
;
3416 priority_info pi
= (priority_info
) n
->value
;
3418 /* Generate the functions themselves, but only if they are really
3420 if (pi
->initializations_p
)
3421 generate_ctor_or_dtor_function (/*constructor_p=*/true, priority
, locus
);
3422 if (pi
->destructions_p
)
3423 generate_ctor_or_dtor_function (/*constructor_p=*/false, priority
, locus
);
3425 /* Keep iterating. */
3429 /* Java requires that we be able to reference a local address for a
3430 method, and not be confused by PLT entries. If hidden aliases are
3431 supported, collect and return all the functions for which we should
3432 emit a hidden alias. */
3434 static struct pointer_set_t
*
3435 collect_candidates_for_java_method_aliases (void)
3437 struct cgraph_node
*node
;
3438 struct pointer_set_t
*candidates
= NULL
;
3440 #ifndef HAVE_GAS_HIDDEN
3444 FOR_EACH_FUNCTION (node
)
3446 tree fndecl
= node
->symbol
.decl
;
3448 if (DECL_CONTEXT (fndecl
)
3449 && TYPE_P (DECL_CONTEXT (fndecl
))
3450 && TYPE_FOR_JAVA (DECL_CONTEXT (fndecl
))
3451 && TARGET_USE_LOCAL_THUNK_ALIAS_P (fndecl
))
3453 if (candidates
== NULL
)
3454 candidates
= pointer_set_create ();
3455 pointer_set_insert (candidates
, fndecl
);
3463 /* Java requires that we be able to reference a local address for a
3464 method, and not be confused by PLT entries. If hidden aliases are
3465 supported, emit one for each java function that we've emitted.
3466 CANDIDATES is the set of FUNCTION_DECLs that were gathered
3467 by collect_candidates_for_java_method_aliases. */
3470 build_java_method_aliases (struct pointer_set_t
*candidates
)
3472 struct cgraph_node
*node
;
3474 #ifndef HAVE_GAS_HIDDEN
3478 FOR_EACH_FUNCTION (node
)
3480 tree fndecl
= node
->symbol
.decl
;
3482 if (TREE_ASM_WRITTEN (fndecl
)
3483 && pointer_set_contains (candidates
, fndecl
))
3485 /* Mangle the name in a predictable way; we need to reference
3486 this from a java compiled object file. */
3487 tree oid
, nid
, alias
;
3491 oid
= DECL_ASSEMBLER_NAME (fndecl
);
3492 oname
= IDENTIFIER_POINTER (oid
);
3493 gcc_assert (oname
[0] == '_' && oname
[1] == 'Z');
3494 nname
= ACONCAT (("_ZGA", oname
+2, NULL
));
3495 nid
= get_identifier (nname
);
3497 alias
= make_alias_for (fndecl
, nid
);
3498 TREE_PUBLIC (alias
) = 1;
3499 DECL_VISIBILITY (alias
) = VISIBILITY_HIDDEN
;
3501 assemble_alias (alias
, oid
);
3506 /* Return C++ property of T, based on given operation OP. */
3509 cpp_check (tree t
, cpp_operation op
)
3514 return DECL_PURE_VIRTUAL_P (t
);
3515 case IS_CONSTRUCTOR
:
3516 return DECL_CONSTRUCTOR_P (t
);
3518 return DECL_DESTRUCTOR_P (t
);
3519 case IS_COPY_CONSTRUCTOR
:
3520 return DECL_COPY_CONSTRUCTOR_P (t
);
3522 return TREE_CODE (t
) == TEMPLATE_DECL
;
3528 /* Collect source file references recursively, starting from NAMESPC. */
3531 collect_source_refs (tree namespc
)
3538 /* Iterate over names in this name space. */
3539 for (t
= NAMESPACE_LEVEL (namespc
)->names
; t
; t
= TREE_CHAIN (t
))
3540 if (!DECL_IS_BUILTIN (t
) )
3541 collect_source_ref (DECL_SOURCE_FILE (t
));
3543 /* Dump siblings, if any */
3544 collect_source_refs (TREE_CHAIN (namespc
));
3546 /* Dump children, if any */
3547 collect_source_refs (NAMESPACE_LEVEL (namespc
)->namespaces
);
3550 /* Collect decls relevant to SOURCE_FILE from all namespaces recursively,
3551 starting from NAMESPC. */
3554 collect_ada_namespace (tree namespc
, const char *source_file
)
3559 /* Collect decls from this namespace */
3560 collect_ada_nodes (NAMESPACE_LEVEL (namespc
)->names
, source_file
);
3562 /* Collect siblings, if any */
3563 collect_ada_namespace (TREE_CHAIN (namespc
), source_file
);
3565 /* Collect children, if any */
3566 collect_ada_namespace (NAMESPACE_LEVEL (namespc
)->namespaces
, source_file
);
3569 /* Returns true iff there is a definition available for variable or
3573 decl_defined_p (tree decl
)
3575 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3576 return (DECL_INITIAL (decl
) != NULL_TREE
);
3579 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
3580 return !DECL_EXTERNAL (decl
);
3584 /* Nonzero for a VAR_DECL whose value can be used in a constant expression.
3588 An integral constant-expression can only involve ... const
3589 variables of integral or enumeration types initialized with
3590 constant expressions ...
3592 C++0x also allows constexpr variables and temporaries initialized
3593 with constant expressions. We handle the former here, but the latter
3594 are just folded away in cxx_eval_constant_expression.
3596 The standard does not require that the expression be non-volatile.
3597 G++ implements the proposed correction in DR 457. */
3600 decl_constant_var_p (tree decl
)
3602 if (!decl_maybe_constant_var_p (decl
))
3605 /* We don't know if a template static data member is initialized with
3606 a constant expression until we instantiate its initializer. Even
3607 in the case of a constexpr variable, we can't treat it as a
3608 constant until its initializer is complete in case it's used in
3609 its own initializer. */
3611 return DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl
);
3614 /* Returns true if DECL could be a symbolic constant variable, depending on
3618 decl_maybe_constant_var_p (tree decl
)
3620 tree type
= TREE_TYPE (decl
);
3621 if (TREE_CODE (decl
) != VAR_DECL
)
3623 if (DECL_DECLARED_CONSTEXPR_P (decl
))
3625 return (CP_TYPE_CONST_NON_VOLATILE_P (type
)
3626 && INTEGRAL_OR_ENUMERATION_TYPE_P (type
));
3629 /* Complain that DECL uses a type with no linkage but is never defined. */
3632 no_linkage_error (tree decl
)
3634 tree t
= no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false);
3635 if (TYPE_ANONYMOUS_P (t
))
3637 permerror (0, "%q+#D, declared using anonymous type, "
3638 "is used but never defined", decl
);
3639 if (is_typedef_decl (TYPE_NAME (t
)))
3640 permerror (0, "%q+#D does not refer to the unqualified type, "
3641 "so it is not used for linkage", TYPE_NAME (t
));
3644 permerror (0, "%q+#D, declared using local type %qT, "
3645 "is used but never defined", decl
, t
);
3648 /* Collect declarations from all namespaces relevant to SOURCE_FILE. */
3651 collect_all_refs (const char *source_file
)
3653 collect_ada_namespace (global_namespace
, source_file
);
3656 /* Clear DECL_EXTERNAL for NODE. */
3659 clear_decl_external (struct cgraph_node
*node
, void *data ATTRIBUTE_UNUSED
)
3661 DECL_EXTERNAL (node
->symbol
.decl
) = 0;
3665 /* This routine is called at the end of compilation.
3666 Its job is to create all the code needed to initialize and
3667 destroy the global aggregates. We do the destruction
3668 first, since that way we only need to reverse the decls once. */
3671 cp_write_global_declarations (void)
3677 unsigned ssdf_count
= 0;
3680 struct pointer_set_t
*candidates
;
3682 locus
= input_location
;
3685 /* Bad parse errors. Just forget about it. */
3686 if (! global_bindings_p () || current_class_type
3687 || !VEC_empty (tree
,decl_namespace_list
))
3691 c_common_write_pch ();
3693 cgraph_process_same_body_aliases ();
3695 /* Handle -fdump-ada-spec[-slim] */
3696 if (dump_enabled_p (TDI_ada
))
3698 if (get_dump_file_info (TDI_ada
)->flags
& TDF_SLIM
)
3699 collect_source_ref (main_input_filename
);
3701 collect_source_refs (global_namespace
);
3703 dump_ada_specs (collect_all_refs
, cpp_check
);
3706 /* FIXME - huh? was input_line -= 1;*/
3708 timevar_start (TV_PHASE_DEFERRED
);
3710 /* We now have to write out all the stuff we put off writing out.
3713 o Template specializations that we have not yet instantiated,
3714 but which are needed.
3715 o Initialization and destruction for non-local objects with
3716 static storage duration. (Local objects with static storage
3717 duration are initialized when their scope is first entered,
3718 and are cleaned up via atexit.)
3719 o Virtual function tables.
3721 All of these may cause others to be needed. For example,
3722 instantiating one function may cause another to be needed, and
3723 generating the initializer for an object may cause templates to be
3724 instantiated, etc., etc. */
3726 emit_support_tinfos ();
3735 /* If there are templates that we've put off instantiating, do
3737 instantiate_pending_templates (retries
);
3740 /* Write out virtual tables as required. Note that writing out
3741 the virtual table for a template class may cause the
3742 instantiation of members of that class. If we write out
3743 vtables then we remove the class from our list so we don't
3744 have to look at it again. */
3746 while (keyed_classes
!= NULL_TREE
3747 && maybe_emit_vtables (TREE_VALUE (keyed_classes
)))
3750 keyed_classes
= TREE_CHAIN (keyed_classes
);
3756 tree next
= TREE_CHAIN (t
);
3760 if (maybe_emit_vtables (TREE_VALUE (next
)))
3763 TREE_CHAIN (t
) = TREE_CHAIN (next
);
3768 next
= TREE_CHAIN (t
);
3772 /* Write out needed type info variables. We have to be careful
3773 looping through unemitted decls, because emit_tinfo_decl may
3774 cause other variables to be needed. New elements will be
3775 appended, and we remove from the vector those that actually
3777 for (i
= VEC_length (tree
, unemitted_tinfo_decls
);
3778 VEC_iterate (tree
, unemitted_tinfo_decls
, --i
, t
);)
3779 if (emit_tinfo_decl (t
))
3782 VEC_unordered_remove (tree
, unemitted_tinfo_decls
, i
);
3785 /* The list of objects with static storage duration is built up
3786 in reverse order. We clear STATIC_AGGREGATES so that any new
3787 aggregates added during the initialization of these will be
3788 initialized in the correct order when we next come around the
3790 vars
= prune_vars_needing_no_initialization (&static_aggregates
);
3794 /* We need to start a new initialization function each time
3795 through the loop. That's because we need to know which
3796 vtables have been referenced, and TREE_SYMBOL_REFERENCED
3797 isn't computed until a function is finished, and written
3798 out. That's a deficiency in the back end. When this is
3799 fixed, these initialization functions could all become
3800 inline, with resulting performance improvements. */
3803 /* Set the line and file, so that it is obviously not from
3805 input_location
= locus
;
3806 ssdf_body
= start_static_storage_duration_function (ssdf_count
);
3808 /* Make sure the back end knows about all the variables. */
3809 write_out_vars (vars
);
3811 /* First generate code to do all the initializations. */
3813 do_static_initialization_or_destruction (vars
, /*initp=*/true);
3815 /* Then, generate code to do all the destructions. Do these
3816 in reverse order so that the most recently constructed
3817 variable is the first destroyed. If we're using
3818 __cxa_atexit, then we don't need to do this; functions
3819 were registered at initialization time to destroy the
3821 if (!flag_use_cxa_atexit
&& vars
)
3823 vars
= nreverse (vars
);
3824 do_static_initialization_or_destruction (vars
, /*initp=*/false);
3829 /* Finish up the static storage duration function for this
3831 input_location
= locus
;
3832 finish_static_storage_duration_function (ssdf_body
);
3834 /* All those initializations and finalizations might cause
3835 us to need more inline functions, more template
3836 instantiations, etc. */
3839 /* ??? was: locus.line++; */
3842 /* Go through the set of inline functions whose bodies have not
3843 been emitted yet. If out-of-line copies of these functions
3844 are required, emit them. */
3845 FOR_EACH_VEC_ELT (tree
, deferred_fns
, i
, decl
)
3847 /* Does it need synthesizing? */
3848 if (DECL_DEFAULTED_FN (decl
) && ! DECL_INITIAL (decl
)
3849 && (! DECL_REALLY_EXTERN (decl
) || possibly_inlined_p (decl
)))
3851 /* Even though we're already at the top-level, we push
3852 there again. That way, when we pop back a few lines
3853 hence, all of our state is restored. Otherwise,
3854 finish_function doesn't clean things up, and we end
3855 up with CURRENT_FUNCTION_DECL set. */
3856 push_to_top_level ();
3857 /* The decl's location will mark where it was first
3858 needed. Save that so synthesize method can indicate
3859 where it was needed from, in case of error */
3860 input_location
= DECL_SOURCE_LOCATION (decl
);
3861 synthesize_method (decl
);
3862 pop_from_top_level ();
3866 if (!DECL_SAVED_TREE (decl
))
3869 /* We lie to the back end, pretending that some functions
3870 are not defined when they really are. This keeps these
3871 functions from being put out unnecessarily. But, we must
3872 stop lying when the functions are referenced, or if they
3873 are not comdat since they need to be put out now. If
3874 DECL_INTERFACE_KNOWN, then we have already set
3875 DECL_EXTERNAL appropriately, so there's no need to check
3876 again, and we do not want to clear DECL_EXTERNAL if a
3877 previous call to import_export_decl set it.
3879 This is done in a separate for cycle, because if some
3880 deferred function is contained in another deferred
3881 function later in deferred_fns varray,
3882 rest_of_compilation would skip this function and we
3883 really cannot expand the same function twice. */
3884 import_export_decl (decl
);
3885 if (DECL_NOT_REALLY_EXTERN (decl
)
3886 && DECL_INITIAL (decl
)
3887 && decl_needed_p (decl
))
3889 struct cgraph_node
*node
, *next
;
3891 node
= cgraph_get_node (decl
);
3892 if (node
->same_body_alias
)
3893 node
= cgraph_alias_aliased_node (node
);
3895 cgraph_for_node_and_aliases (node
, clear_decl_external
,
3897 /* If we mark !DECL_EXTERNAL one of the symbols in some comdat
3898 group, we need to mark all symbols in the same comdat group
3900 if (node
->symbol
.same_comdat_group
)
3901 for (next
= cgraph (node
->symbol
.same_comdat_group
);
3903 next
= cgraph (next
->symbol
.same_comdat_group
))
3904 cgraph_for_node_and_aliases (next
, clear_decl_external
,
3908 /* If we're going to need to write this function out, and
3909 there's already a body for it, create RTL for it now.
3910 (There might be no body if this is a method we haven't
3911 gotten around to synthesizing yet.) */
3912 if (!DECL_EXTERNAL (decl
)
3913 && decl_needed_p (decl
)
3914 && !TREE_ASM_WRITTEN (decl
)
3915 && !cgraph_get_node (decl
)->local
.finalized
)
3917 /* We will output the function; no longer consider it in this
3919 DECL_DEFER_OUTPUT (decl
) = 0;
3920 /* Generate RTL for this function now that we know we
3922 expand_or_defer_fn (decl
);
3923 /* If we're compiling -fsyntax-only pretend that this
3924 function has been written out so that we don't try to
3926 if (flag_syntax_only
)
3927 TREE_ASM_WRITTEN (decl
) = 1;
3932 if (walk_namespaces (wrapup_globals_for_namespace
, /*data=*/0))
3935 /* Static data members are just like namespace-scope globals. */
3936 FOR_EACH_VEC_ELT (tree
, pending_statics
, i
, decl
)
3938 if (var_finalized_p (decl
) || DECL_REALLY_EXTERN (decl
)
3939 /* Don't write it out if we haven't seen a definition. */
3940 || DECL_IN_AGGR_P (decl
))
3942 import_export_decl (decl
);
3943 /* If this static data member is needed, provide it to the
3945 if (DECL_NOT_REALLY_EXTERN (decl
) && decl_needed_p (decl
))
3946 DECL_EXTERNAL (decl
) = 0;
3948 if (VEC_length (tree
, pending_statics
) != 0
3949 && wrapup_global_declarations (VEC_address (tree
, pending_statics
),
3950 VEC_length (tree
, pending_statics
)))
3957 /* All used inline functions must have a definition at this point. */
3958 FOR_EACH_VEC_ELT (tree
, deferred_fns
, i
, decl
)
3960 if (/* Check online inline functions that were actually used. */
3961 DECL_ODR_USED (decl
) && DECL_DECLARED_INLINE_P (decl
)
3962 /* If the definition actually was available here, then the
3963 fact that the function was not defined merely represents
3964 that for some reason (use of a template repository,
3965 #pragma interface, etc.) we decided not to emit the
3967 && !DECL_INITIAL (decl
)
3968 /* Don't complain if the template was defined. */
3969 && !(DECL_TEMPLATE_INSTANTIATION (decl
)
3970 && DECL_INITIAL (DECL_TEMPLATE_RESULT
3971 (template_for_substitution (decl
)))))
3973 warning (0, "inline function %q+D used but never defined", decl
);
3974 /* Avoid a duplicate warning from check_global_declaration_1. */
3975 TREE_NO_WARNING (decl
) = 1;
3979 /* So must decls that use a type with no linkage. */
3980 FOR_EACH_VEC_ELT (tree
, no_linkage_decls
, i
, decl
)
3981 if (!decl_defined_p (decl
))
3982 no_linkage_error (decl
);
3984 /* Then, do the Objective-C stuff. This is where all the
3985 Objective-C module stuff gets generated (symtab,
3986 class/protocol/selector lists etc). This must be done after C++
3987 templates, destructors etc. so that selectors used in C++
3988 templates are properly allocated. */
3989 if (c_dialect_objc ())
3990 objc_write_global_declarations ();
3992 /* We give C linkage to static constructors and destructors. */
3993 push_lang_context (lang_name_c
);
3995 /* Generate initialization and destruction functions for all
3996 priorities for which they are required. */
3997 if (priority_info_map
)
3998 splay_tree_foreach (priority_info_map
,
3999 generate_ctor_and_dtor_functions_for_priority
,
4001 else if (c_dialect_objc () && objc_static_init_needed_p ())
4002 /* If this is obj-c++ and we need a static init, call
4003 generate_ctor_or_dtor_function. */
4004 generate_ctor_or_dtor_function (/*constructor_p=*/true,
4005 DEFAULT_INIT_PRIORITY
, &locus
);
4007 /* We're done with the splay-tree now. */
4008 if (priority_info_map
)
4009 splay_tree_delete (priority_info_map
);
4011 /* Generate any missing aliases. */
4012 maybe_apply_pending_pragma_weaks ();
4014 /* We're done with static constructors, so we can go back to "C++"
4016 pop_lang_context ();
4018 /* Collect candidates for Java hidden aliases. */
4019 candidates
= collect_candidates_for_java_method_aliases ();
4021 timevar_stop (TV_PHASE_DEFERRED
);
4022 timevar_start (TV_PHASE_CGRAPH
);
4024 finalize_compilation_unit ();
4026 timevar_stop (TV_PHASE_CGRAPH
);
4027 timevar_start (TV_PHASE_CHECK_DBGINFO
);
4029 /* Now, issue warnings about static, but not defined, functions,
4030 etc., and emit debugging information. */
4031 walk_namespaces (wrapup_globals_for_namespace
, /*data=*/&reconsider
);
4032 if (VEC_length (tree
, pending_statics
) != 0)
4034 check_global_declarations (VEC_address (tree
, pending_statics
),
4035 VEC_length (tree
, pending_statics
));
4036 emit_debug_global_declarations (VEC_address (tree
, pending_statics
),
4037 VEC_length (tree
, pending_statics
));
4040 perform_deferred_noexcept_checks ();
4042 /* Generate hidden aliases for Java. */
4045 build_java_method_aliases (candidates
);
4046 pointer_set_destroy (candidates
);
4051 /* The entire file is now complete. If requested, dump everything
4055 FILE *stream
= dump_begin (TDI_tu
, &flags
);
4059 dump_node (global_namespace
, flags
& ~TDF_SLIM
, stream
);
4060 dump_end (TDI_tu
, stream
);
4064 if (flag_detailed_statistics
)
4066 dump_tree_statistics ();
4067 dump_time_statistics ();
4069 input_location
= locus
;
4071 #ifdef ENABLE_CHECKING
4072 validate_conversion_obstack ();
4073 #endif /* ENABLE_CHECKING */
4075 timevar_stop (TV_PHASE_CHECK_DBGINFO
);
4078 /* FN is an OFFSET_REF, DOTSTAR_EXPR or MEMBER_REF indicating the
4079 function to call in parse-tree form; it has not yet been
4080 semantically analyzed. ARGS are the arguments to the function.
4081 They have already been semantically analyzed. This may change
4085 build_offset_ref_call_from_tree (tree fn
, VEC(tree
,gc
) **args
)
4088 VEC(tree
,gc
) *orig_args
= NULL
;
4093 object
= TREE_OPERAND (fn
, 0);
4095 if (processing_template_decl
)
4097 gcc_assert (TREE_CODE (fn
) == DOTSTAR_EXPR
4098 || TREE_CODE (fn
) == MEMBER_REF
);
4099 if (type_dependent_expression_p (fn
)
4100 || any_type_dependent_arguments_p (*args
))
4101 return build_nt_call_vec (fn
, *args
);
4103 orig_args
= make_tree_vector_copy (*args
);
4105 /* Transform the arguments and add the implicit "this"
4106 parameter. That must be done before the FN is transformed
4107 because we depend on the form of FN. */
4108 make_args_non_dependent (*args
);
4109 object
= build_non_dependent_expr (object
);
4110 if (TREE_CODE (TREE_TYPE (fn
)) == METHOD_TYPE
)
4112 if (TREE_CODE (fn
) == DOTSTAR_EXPR
)
4113 object
= cp_build_addr_expr (object
, tf_warning_or_error
);
4114 VEC_safe_insert (tree
, gc
, *args
, 0, object
);
4116 /* Now that the arguments are done, transform FN. */
4117 fn
= build_non_dependent_expr (fn
);
4120 /* A qualified name corresponding to a bound pointer-to-member is
4121 represented as an OFFSET_REF:
4123 struct B { void g(); };
4125 void B::g() { (this->*p)(); } */
4126 if (TREE_CODE (fn
) == OFFSET_REF
)
4128 tree object_addr
= cp_build_addr_expr (object
, tf_warning_or_error
);
4129 fn
= TREE_OPERAND (fn
, 1);
4130 fn
= get_member_function_from_ptrfunc (&object_addr
, fn
,
4131 tf_warning_or_error
);
4132 VEC_safe_insert (tree
, gc
, *args
, 0, object_addr
);
4135 if (CLASS_TYPE_P (TREE_TYPE (fn
)))
4136 expr
= build_op_call (fn
, args
, tf_warning_or_error
);
4138 expr
= cp_build_function_call_vec (fn
, args
, tf_warning_or_error
);
4139 if (processing_template_decl
&& expr
!= error_mark_node
)
4140 expr
= build_min_non_dep_call_vec (expr
, orig_fn
, orig_args
);
4142 if (orig_args
!= NULL
)
4143 release_tree_vector (orig_args
);
4150 check_default_args (tree x
)
4152 tree arg
= TYPE_ARG_TYPES (TREE_TYPE (x
));
4153 bool saw_def
= false;
4154 int i
= 0 - (TREE_CODE (TREE_TYPE (x
)) == METHOD_TYPE
);
4155 for (; arg
&& arg
!= void_list_node
; arg
= TREE_CHAIN (arg
), ++i
)
4157 if (TREE_PURPOSE (arg
))
4161 error ("default argument missing for parameter %P of %q+#D", i
, x
);
4162 TREE_PURPOSE (arg
) = error_mark_node
;
4167 /* Return true if function DECL can be inlined. This is used to force
4168 instantiation of methods that might be interesting for inlining. */
4170 possibly_inlined_p (tree decl
)
4172 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
4173 if (DECL_UNINLINABLE (decl
))
4175 if (!optimize
|| pragma_java_exceptions
)
4176 return DECL_DECLARED_INLINE_P (decl
);
4177 /* When optimizing, we might inline everything when flatten
4178 attribute or heuristics inlining for size or autoinlining
4183 /* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
4184 If DECL is a specialization or implicitly declared class member,
4185 generate the actual definition. Return false if something goes
4186 wrong, true otherwise. */
4189 mark_used (tree decl
)
4191 /* If DECL is a BASELINK for a single function, then treat it just
4192 like the DECL for the function. Otherwise, if the BASELINK is
4193 for an overloaded function, we don't know which function was
4194 actually used until after overload resolution. */
4195 if (BASELINK_P (decl
))
4197 decl
= BASELINK_FUNCTIONS (decl
);
4198 if (really_overloaded_fn (decl
))
4200 decl
= OVL_CURRENT (decl
);
4203 /* Set TREE_USED for the benefit of -Wunused. */
4204 TREE_USED (decl
) = 1;
4205 if (DECL_CLONED_FUNCTION_P (decl
))
4206 TREE_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
4208 if (TREE_CODE (decl
) == FUNCTION_DECL
4209 && DECL_DELETED_FN (decl
))
4211 if (DECL_ARTIFICIAL (decl
))
4213 if (DECL_OVERLOADED_OPERATOR_P (decl
) == TYPE_EXPR
4214 && LAMBDA_TYPE_P (DECL_CONTEXT (decl
)))
4216 /* We mark a lambda conversion op as deleted if we can't
4217 generate it properly; see maybe_add_lambda_conv_op. */
4218 sorry ("converting lambda which uses %<...%> to "
4219 "function pointer");
4223 error ("use of deleted function %qD", decl
);
4224 if (!maybe_explain_implicit_delete (decl
))
4225 error_at (DECL_SOURCE_LOCATION (decl
), "declared here");
4229 /* We can only check DECL_ODR_USED on variables or functions with
4230 DECL_LANG_SPECIFIC set, and these are also the only decls that we
4231 might need special handling for. */
4232 if ((TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != FUNCTION_DECL
)
4233 || DECL_LANG_SPECIFIC (decl
) == NULL
4234 || DECL_THUNK_P (decl
))
4236 if (!processing_template_decl
&& type_uses_auto (TREE_TYPE (decl
)))
4237 error ("use of %qD before deduction of %<auto%>", decl
);
4241 /* We only want to do this processing once. We don't need to keep trying
4242 to instantiate inline templates, because unit-at-a-time will make sure
4243 we get them compiled before functions that want to inline them. */
4244 if (DECL_ODR_USED (decl
))
4247 /* If within finish_function, defer the rest until that function
4248 finishes, otherwise it might recurse. */
4249 if (defer_mark_used_calls
)
4251 VEC_safe_push (tree
, gc
, deferred_mark_used_calls
, decl
);
4255 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4256 maybe_instantiate_noexcept (decl
);
4258 /* Normally, we can wait until instantiation-time to synthesize DECL.
4259 However, if DECL is a static data member initialized with a constant
4260 or a constexpr function, we need it right now because a reference to
4261 such a data member or a call to such function is not value-dependent.
4262 For a function that uses auto in the return type, we need to instantiate
4263 it to find out its type. */
4264 if ((decl_maybe_constant_var_p (decl
)
4265 || (TREE_CODE (decl
) == FUNCTION_DECL
4266 && (DECL_DECLARED_CONSTEXPR_P (decl
)
4267 || type_uses_auto (TREE_TYPE (TREE_TYPE (decl
))))))
4268 && DECL_LANG_SPECIFIC (decl
)
4269 && DECL_TEMPLATE_INFO (decl
)
4270 && !uses_template_parms (DECL_TI_ARGS (decl
)))
4272 /* Instantiating a function will result in garbage collection. We
4273 must treat this situation as if we were within the body of a
4274 function so as to avoid collecting live data only referenced from
4275 the stack (such as overload resolution candidates). */
4277 instantiate_decl (decl
, /*defer_ok=*/false,
4278 /*expl_inst_class_mem_p=*/false);
4282 if (type_uses_auto (TREE_TYPE (decl
)))
4283 error ("use of %qD before deduction of %<auto%>", decl
);
4285 /* If we don't need a value, then we don't need to synthesize DECL. */
4286 if (cp_unevaluated_operand
!= 0)
4289 if (processing_template_decl
)
4292 /* Check this too in case we're within fold_non_dependent_expr. */
4293 if (DECL_TEMPLATE_INFO (decl
)
4294 && uses_template_parms (DECL_TI_ARGS (decl
)))
4297 DECL_ODR_USED (decl
) = 1;
4298 if (DECL_CLONED_FUNCTION_P (decl
))
4299 DECL_ODR_USED (DECL_CLONED_FUNCTION (decl
)) = 1;
4301 /* DR 757: A type without linkage shall not be used as the type of a
4302 variable or function with linkage, unless
4303 o the variable or function has extern "C" linkage (7.5 [dcl.link]), or
4304 o the variable or function is not used (3.2 [basic.def.odr]) or is
4305 defined in the same translation unit. */
4306 if (cxx_dialect
> cxx98
4307 && decl_linkage (decl
) != lk_none
4308 && !DECL_EXTERN_C_P (decl
)
4309 && !DECL_ARTIFICIAL (decl
)
4310 && !decl_defined_p (decl
)
4311 && no_linkage_check (TREE_TYPE (decl
), /*relaxed_p=*/false))
4313 if (is_local_extern (decl
))
4314 /* There's no way to define a local extern, and adding it to
4315 the vector interferes with GC, so give an error now. */
4316 no_linkage_error (decl
);
4318 VEC_safe_push (tree
, gc
, no_linkage_decls
, decl
);
4321 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_DECLARED_INLINE_P (decl
)
4322 && !DECL_INITIAL (decl
) && !DECL_ARTIFICIAL (decl
))
4323 /* Remember it, so we can check it was defined. */
4324 note_vague_linkage_fn (decl
);
4326 /* Is it a synthesized method that needs to be synthesized? */
4327 if (TREE_CODE (decl
) == FUNCTION_DECL
4328 && DECL_NONSTATIC_MEMBER_FUNCTION_P (decl
)
4329 && DECL_DEFAULTED_FN (decl
)
4330 /* A function defaulted outside the class is synthesized either by
4331 cp_finish_decl or instantiate_decl. */
4332 && !DECL_DEFAULTED_OUTSIDE_CLASS_P (decl
)
4333 && ! DECL_INITIAL (decl
))
4335 /* Defer virtual destructors so that thunks get the right
4337 if (DECL_VIRTUAL_P (decl
) && !at_eof
)
4339 note_vague_linkage_fn (decl
);
4343 /* Remember the current location for a function we will end up
4344 synthesizing. Then we can inform the user where it was
4345 required in the case of error. */
4346 DECL_SOURCE_LOCATION (decl
) = input_location
;
4348 /* Synthesizing an implicitly defined member function will result in
4349 garbage collection. We must treat this situation as if we were
4350 within the body of a function so as to avoid collecting live data
4351 on the stack (such as overload resolution candidates).
4353 We could just let cp_write_global_declarations handle synthesizing
4354 this function by adding it to deferred_fns, but doing
4355 it at the use site produces better error messages. */
4357 synthesize_method (decl
);
4359 /* If this is a synthesized method we don't need to
4360 do the instantiation test below. */
4362 else if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4363 && DECL_TEMPLATE_INFO (decl
)
4364 && (!DECL_EXPLICIT_INSTANTIATION (decl
)
4365 || always_instantiate_p (decl
)))
4366 /* If this is a function or variable that is an instance of some
4367 template, we now know that we will need to actually do the
4368 instantiation. We check that DECL is not an explicit
4369 instantiation because that is not checked in instantiate_decl.
4371 We put off instantiating functions in order to improve compile
4372 times. Maintaining a stack of active functions is expensive,
4373 and the inliner knows to instantiate any functions it might
4374 need. Therefore, we always try to defer instantiation. */
4377 instantiate_decl (decl
, /*defer_ok=*/true,
4378 /*expl_inst_class_mem_p=*/false);
4385 #include "gt-cp-decl2.h"