1 /* Definitions for c-common.c.
2 Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 #ifndef GCC_C_COMMON_H
23 #define GCC_C_COMMON_H
25 #include "splay-tree.h"
29 /* Usage of TREE_LANG_FLAG_?:
30 0: TREE_NEGATED_INT (in INTEGER_CST).
31 IDENTIFIER_MARKED (used by search routines).
32 DECL_PRETTY_FUNCTION_P (in VAR_DECL)
33 C_MAYBE_CONST_EXPR_INT_OPERANDS (in C_MAYBE_CONST_EXPR, for C)
34 1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
35 STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
36 C_MAYBE_CONST_EXPR_NON_CONST (in C_MAYBE_CONST_EXPR, for C)
38 3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
42 /* Reserved identifiers. This is the union of all the keywords for C,
43 C++, and Objective-C. All the type modifiers have to be in one
44 block at the beginning, because they are used as mask bits. There
45 are 27 type modifiers; if we add many more we will have to redesign
46 the mask mechanism. */
51 /* C, in empirical order of frequency. */
53 RID_UNSIGNED, RID_LONG, RID_CONST, RID_EXTERN,
54 RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
55 RID_VOLATILE, RID_SIGNED, RID_AUTO, RID_RESTRICT,
58 RID_COMPLEX, RID_THREAD, RID_SAT,
61 RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
64 RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
67 RID_INT, RID_CHAR, RID_FLOAT, RID_DOUBLE, RID_VOID,
68 RID_ENUM, RID_STRUCT, RID_UNION, RID_IF, RID_ELSE,
69 RID_WHILE, RID_DO, RID_FOR, RID_SWITCH, RID_CASE,
70 RID_DEFAULT, RID_BREAK, RID_CONTINUE, RID_RETURN, RID_GOTO,
74 RID_ASM, RID_TYPEOF, RID_ALIGNOF, RID_ATTRIBUTE, RID_VA_ARG,
75 RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL, RID_CHOOSE_EXPR,
76 RID_TYPES_COMPATIBLE_P,
77 RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
80 /* This means to warn that this is a C++ keyword, and then treat it
81 as a normal identifier. */
84 /* Too many ways of getting the name of a function as a string */
85 RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
88 RID_BOOL, RID_WCHAR, RID_CLASS,
89 RID_PUBLIC, RID_PRIVATE, RID_PROTECTED,
90 RID_TEMPLATE, RID_NULL, RID_CATCH,
91 RID_DELETE, RID_FALSE, RID_NAMESPACE,
92 RID_NEW, RID_OFFSETOF, RID_OPERATOR,
93 RID_THIS, RID_THROW, RID_TRUE,
94 RID_TRY, RID_TYPENAME, RID_TYPEID,
95 RID_USING, RID_CHAR16, RID_CHAR32,
98 RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
101 RID_HAS_NOTHROW_ASSIGN, RID_HAS_NOTHROW_CONSTRUCTOR,
102 RID_HAS_NOTHROW_COPY, RID_HAS_TRIVIAL_ASSIGN,
103 RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
104 RID_HAS_TRIVIAL_DESTRUCTOR, RID_HAS_VIRTUAL_DESTRUCTOR,
105 RID_IS_ABSTRACT, RID_IS_BASE_OF,
106 RID_IS_CONVERTIBLE_TO, RID_IS_CLASS,
107 RID_IS_EMPTY, RID_IS_ENUM,
108 RID_IS_POD, RID_IS_POLYMORPHIC,
112 RID_STATIC_ASSERT, RID_DECLTYPE,
115 RID_AT_ENCODE, RID_AT_END,
116 RID_AT_CLASS, RID_AT_ALIAS, RID_AT_DEFS,
117 RID_AT_PRIVATE, RID_AT_PROTECTED, RID_AT_PUBLIC,
118 RID_AT_PROTOCOL, RID_AT_SELECTOR,
119 RID_AT_THROW, RID_AT_TRY, RID_AT_CATCH,
120 RID_AT_FINALLY, RID_AT_SYNCHRONIZED,
122 RID_AT_IMPLEMENTATION,
126 RID_FIRST_MODIFIER = RID_STATIC,
127 RID_LAST_MODIFIER = RID_ONEWAY,
129 RID_FIRST_CXX0X = RID_STATIC_ASSERT,
130 RID_LAST_CXX0X = RID_DECLTYPE,
131 RID_FIRST_AT = RID_AT_ENCODE,
132 RID_LAST_AT = RID_AT_IMPLEMENTATION,
133 RID_FIRST_PQ = RID_IN,
134 RID_LAST_PQ = RID_ONEWAY
137 #define OBJC_IS_AT_KEYWORD(rid) \
138 ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
139 (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
141 #define OBJC_IS_PQ_KEYWORD(rid) \
142 ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
143 (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
145 /* The elements of `ridpointers' are identifier nodes for the reserved
146 type names and storage classes. It is indexed by a RID_... value. */
147 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
149 /* Standard named or nameless data types of the C compiler. */
156 CTI_UNDERLYING_WCHAR_TYPE,
158 CTI_SIGNED_SIZE_TYPE, /* For format checking only. */
159 CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only. */
162 CTI_WIDEST_INT_LIT_TYPE,
163 CTI_WIDEST_UINT_LIT_TYPE,
165 /* Types for <stdint.h>, that may not be defined on all
177 CTI_INT_LEAST16_TYPE,
178 CTI_INT_LEAST32_TYPE,
179 CTI_INT_LEAST64_TYPE,
180 CTI_UINT_LEAST8_TYPE,
181 CTI_UINT_LEAST16_TYPE,
182 CTI_UINT_LEAST32_TYPE,
183 CTI_UINT_LEAST64_TYPE,
189 CTI_UINT_FAST16_TYPE,
190 CTI_UINT_FAST32_TYPE,
191 CTI_UINT_FAST64_TYPE,
196 CTI_CHAR16_ARRAY_TYPE,
197 CTI_CHAR32_ARRAY_TYPE,
198 CTI_WCHAR_ARRAY_TYPE,
201 CTI_CONST_STRING_TYPE,
203 /* Type for boolean expressions (bool in C++, int in C). */
206 CTI_TRUTHVALUE_FALSE,
208 CTI_DEFAULT_FUNCTION_TYPE,
210 /* These are not types, but we have to look them up all the time. */
211 CTI_FUNCTION_NAME_DECL,
212 CTI_PRETTY_FUNCTION_NAME_DECL,
213 CTI_C99_FUNCTION_NAME_DECL,
214 CTI_SAVED_FUNCTION_NAME_DECLS,
223 #define C_CPP_HASHNODE(id) \
224 (&(((struct c_common_identifier *) (id))->node))
225 #define C_RID_CODE(id) \
226 ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
227 #define C_SET_RID_CODE(id, code) \
228 (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
230 /* Identifier part common to the C front ends. Inherits from
231 tree_identifier, despite appearances. */
232 struct c_common_identifier GTY(())
234 struct tree_common common;
235 struct cpp_hashnode node;
238 /* An entry in the reserved keyword table. */
240 struct c_common_resword
242 const char *const word;
243 ENUM_BITFIELD(rid) const rid : 16;
244 const unsigned int disable : 16;
247 /* Disable mask. Keywords are disabled if (reswords[i].disable &
248 mask) is _true_. Thus for keywords which are present in all
249 languages the disable field is zero. */
251 #define D_CONLY 0x001 /* C only (not in C++). */
252 #define D_CXXONLY 0x002 /* C++ only (not in C). */
253 #define D_C99 0x004 /* In C, C99 only. */
254 #define D_CXX0X 0x008 /* In C++, C++0X only. */
255 #define D_EXT 0x010 /* GCC extension. */
256 #define D_EXT89 0x020 /* GCC extension incorporated in C99. */
257 #define D_ASM 0x040 /* Disabled by -fno-asm. */
258 #define D_OBJC 0x080 /* In Objective C and neither C nor C++. */
259 #define D_CXX_OBJC 0x100 /* In Objective C, and C++, but not C. */
260 #define D_CXXWARN 0x200 /* In C warn with -Wcxx-compat. */
262 /* The reserved keyword table. */
263 extern const struct c_common_resword c_common_reswords[];
265 /* The number of items in the reserved keyword table. */
266 extern const unsigned int num_c_common_reswords;
268 #define char16_type_node c_global_trees[CTI_CHAR16_TYPE]
269 #define char32_type_node c_global_trees[CTI_CHAR32_TYPE]
270 #define wchar_type_node c_global_trees[CTI_WCHAR_TYPE]
271 #define underlying_wchar_type_node c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
272 #define wint_type_node c_global_trees[CTI_WINT_TYPE]
273 #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE]
274 #define unsigned_ptrdiff_type_node c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
275 #define intmax_type_node c_global_trees[CTI_INTMAX_TYPE]
276 #define uintmax_type_node c_global_trees[CTI_UINTMAX_TYPE]
277 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
278 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
280 #define sig_atomic_type_node c_global_trees[CTI_SIG_ATOMIC_TYPE]
281 #define int8_type_node c_global_trees[CTI_INT8_TYPE]
282 #define int16_type_node c_global_trees[CTI_INT16_TYPE]
283 #define int32_type_node c_global_trees[CTI_INT32_TYPE]
284 #define int64_type_node c_global_trees[CTI_INT64_TYPE]
285 #define uint8_type_node c_global_trees[CTI_UINT8_TYPE]
286 #define uint16_type_node c_global_trees[CTI_UINT16_TYPE]
287 #define c_uint32_type_node c_global_trees[CTI_UINT32_TYPE]
288 #define c_uint64_type_node c_global_trees[CTI_UINT64_TYPE]
289 #define int_least8_type_node c_global_trees[CTI_INT_LEAST8_TYPE]
290 #define int_least16_type_node c_global_trees[CTI_INT_LEAST16_TYPE]
291 #define int_least32_type_node c_global_trees[CTI_INT_LEAST32_TYPE]
292 #define int_least64_type_node c_global_trees[CTI_INT_LEAST64_TYPE]
293 #define uint_least8_type_node c_global_trees[CTI_UINT_LEAST8_TYPE]
294 #define uint_least16_type_node c_global_trees[CTI_UINT_LEAST16_TYPE]
295 #define uint_least32_type_node c_global_trees[CTI_UINT_LEAST32_TYPE]
296 #define uint_least64_type_node c_global_trees[CTI_UINT_LEAST64_TYPE]
297 #define int_fast8_type_node c_global_trees[CTI_INT_FAST8_TYPE]
298 #define int_fast16_type_node c_global_trees[CTI_INT_FAST16_TYPE]
299 #define int_fast32_type_node c_global_trees[CTI_INT_FAST32_TYPE]
300 #define int_fast64_type_node c_global_trees[CTI_INT_FAST64_TYPE]
301 #define uint_fast8_type_node c_global_trees[CTI_UINT_FAST8_TYPE]
302 #define uint_fast16_type_node c_global_trees[CTI_UINT_FAST16_TYPE]
303 #define uint_fast32_type_node c_global_trees[CTI_UINT_FAST32_TYPE]
304 #define uint_fast64_type_node c_global_trees[CTI_UINT_FAST64_TYPE]
305 #define intptr_type_node c_global_trees[CTI_INTPTR_TYPE]
306 #define uintptr_type_node c_global_trees[CTI_UINTPTR_TYPE]
308 #define truthvalue_type_node c_global_trees[CTI_TRUTHVALUE_TYPE]
309 #define truthvalue_true_node c_global_trees[CTI_TRUTHVALUE_TRUE]
310 #define truthvalue_false_node c_global_trees[CTI_TRUTHVALUE_FALSE]
312 #define char_array_type_node c_global_trees[CTI_CHAR_ARRAY_TYPE]
313 #define char16_array_type_node c_global_trees[CTI_CHAR16_ARRAY_TYPE]
314 #define char32_array_type_node c_global_trees[CTI_CHAR32_ARRAY_TYPE]
315 #define wchar_array_type_node c_global_trees[CTI_WCHAR_ARRAY_TYPE]
316 #define int_array_type_node c_global_trees[CTI_INT_ARRAY_TYPE]
317 #define string_type_node c_global_trees[CTI_STRING_TYPE]
318 #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE]
320 #define default_function_type c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
322 #define function_name_decl_node c_global_trees[CTI_FUNCTION_NAME_DECL]
323 #define pretty_function_name_decl_node c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
324 #define c99_function_name_decl_node c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
325 #define saved_function_name_decls c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
327 /* A node for `((void) 0)'. */
328 #define void_zero_node c_global_trees[CTI_VOID_ZERO]
330 /* The node for C++ `__null'. */
331 #define null_node c_global_trees[CTI_NULL]
333 extern GTY(()) tree c_global_trees[CTI_MAX];
335 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
336 tree for size reasons. */
337 struct sorted_fields_type GTY(())
340 tree GTY((length ("%h.len"))) elts[1];
343 /* Mark which labels are explicitly declared.
344 These may be shadowed, and may be referenced from nested functions. */
345 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
347 typedef enum c_language_kind
349 clk_c = 0, /* C90, C94 or C99 */
350 clk_objc = 1, /* clk_c with ObjC features. */
351 clk_cxx = 2, /* ANSI/ISO C++ */
352 clk_objcxx = 3 /* clk_cxx with ObjC features. */
356 /* To test for a specific language use c_language, defined by each
357 front end. For "ObjC features" or "not C++" use the macros. */
358 extern c_language_kind c_language;
360 #define c_dialect_cxx() (c_language & clk_cxx)
361 #define c_dialect_objc() (c_language & clk_objc)
363 /* Information about a statement tree. */
365 struct stmt_tree_s GTY(()) {
366 /* The current statement list being collected. */
367 tree x_cur_stmt_list;
369 /* In C++, Nonzero if we should treat statements as full
370 expressions. In particular, this variable is no-zero if at the
371 end of a statement we should destroy any temporaries created
372 during that statement. Similarly, if, at the end of a block, we
373 should destroy any local variables in this block. Normally, this
374 variable is nonzero, since those are the normal semantics of
377 However, in order to represent aggregate initialization code as
378 tree structure, we use statement-expressions. The statements
379 within the statement expression should not result in cleanups
380 being run until the entire enclosing statement is complete.
382 This flag has no effect in C. */
383 int stmts_are_full_exprs_p;
386 typedef struct stmt_tree_s *stmt_tree;
388 /* Global state pertinent to the current function. Some C dialects
389 extend this structure with additional fields. */
391 struct c_language_function GTY(()) {
392 /* While we are parsing the function, this contains information
393 about the statement-tree that we are building. */
394 struct stmt_tree_s x_stmt_tree;
397 /* When building a statement-tree, this is the current statement list
398 being collected. It's TREE_CHAIN is a back-pointer to the previous
401 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
403 /* Language-specific hooks. */
405 /* If non-NULL, this function is called after a precompile header file
407 extern void (*lang_post_pch_load) (void);
409 extern void push_file_scope (void);
410 extern void pop_file_scope (void);
411 extern stmt_tree current_stmt_tree (void);
412 extern tree push_stmt_list (void);
413 extern tree pop_stmt_list (tree);
414 extern tree add_stmt (tree);
415 extern void push_cleanup (tree, tree, bool);
416 extern tree pushdecl_top_level (tree);
417 extern tree pushdecl (tree);
418 extern tree build_modify_expr (location_t, tree, enum tree_code, tree, tree);
419 extern tree build_indirect_ref (location_t, tree, const char *);
421 extern int c_expand_decl (tree);
423 extern int field_decl_cmp (const void *, const void *);
424 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
426 extern bool has_c_linkage (const_tree decl);
428 /* Switches common to the C front ends. */
430 /* Nonzero if prepreprocessing only. */
432 extern int flag_preprocess_only;
434 /* Zero means that faster, ...NonNil variants of objc_msgSend...
435 calls will be used in ObjC; passing nil receivers to such calls
436 will most likely result in crashes. */
437 extern int flag_nil_receivers;
439 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
440 @try, etc.) in source code. */
441 extern int flag_objc_exceptions;
443 /* Nonzero means that we generate NeXT setjmp based exceptions. */
444 extern int flag_objc_sjlj_exceptions;
446 /* Nonzero means that code generation will be altered to support
447 "zero-link" execution. This currently affects ObjC only, but may
448 affect other languages in the future. */
449 extern int flag_zero_link;
451 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
452 unit. It will inform the ObjC runtime that class definition(s) herein
453 contained are to replace one(s) previously loaded. */
454 extern int flag_replace_objc_classes;
456 /* Nonzero means don't output line number information. */
458 extern char flag_no_line_commands;
460 /* Nonzero causes -E output not to be done, but directives such as
461 #define that have side effects are still obeyed. */
463 extern char flag_no_output;
465 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
466 'N' or 'U' of the command line switch. */
468 extern char flag_dump_macros;
470 /* Nonzero means pass #include lines through to the output. */
472 extern char flag_dump_includes;
474 /* Nonzero means process PCH files while preprocessing. */
476 extern bool flag_pch_preprocess;
478 /* The file name to which we should write a precompiled header, or
479 NULL if no header will be written in this compile. */
481 extern const char *pch_file;
483 /* Nonzero if an ISO standard was selected. It rejects macros in the
488 /* Nonzero if -undef was given. It suppresses target built-in macros
491 extern int flag_undef;
493 /* Nonzero means don't recognize the non-ANSI builtin functions. */
495 extern int flag_no_builtin;
497 /* Nonzero means don't recognize the non-ANSI builtin functions.
500 extern int flag_no_nonansi_builtin;
502 /* Nonzero means give `double' the same size as `float'. */
504 extern int flag_short_double;
506 /* Nonzero means give `wchar_t' the same size as `short'. */
508 extern int flag_short_wchar;
510 /* Nonzero means allow implicit conversions between vectors with
511 differing numbers of subparts and/or differing element types. */
512 extern int flag_lax_vector_conversions;
514 /* Nonzero means allow Microsoft extensions without warnings or errors. */
515 extern int flag_ms_extensions;
517 /* Nonzero means don't recognize the keyword `asm'. */
519 extern int flag_no_asm;
521 /* Nonzero means give string constants the type `const char *', as mandated
524 extern int flag_const_strings;
526 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
528 extern int flag_signed_bitfields;
530 /* Warn about #pragma directives that are not recognized. */
532 extern int warn_unknown_pragmas; /* Tri state variable. */
534 /* Warn about format/argument anomalies in calls to formatted I/O functions
535 (*printf, *scanf, strftime, strfmon, etc.). */
537 extern int warn_format;
540 /* C/ObjC language option variables. */
543 /* Nonzero means allow type mismatches in conditional expressions;
544 just make their values `void'. */
546 extern int flag_cond_mismatch;
548 /* Nonzero means enable C89 Amendment 1 features. */
550 extern int flag_isoc94;
552 /* Nonzero means use the ISO C99 dialect of C. */
554 extern int flag_isoc99;
556 /* Nonzero means that we have builtin functions, and main is an int. */
558 extern int flag_hosted;
560 /* ObjC language option variables. */
563 /* Open and close the file for outputting class declarations, if
566 extern int flag_gen_declaration;
568 /* Tells the compiler that this is a special run. Do not perform any
569 compiling, instead we are to test some platform dependent features
570 and output a C header file with appropriate definitions. */
572 extern int print_struct_values;
574 /* ???. Undocumented. */
576 extern const char *constant_string_class_name;
579 /* C++ language option variables. */
582 /* Nonzero means don't recognize any extension keywords. */
584 extern int flag_no_gnu_keywords;
586 /* Nonzero means do emit exported implementations of functions even if
587 they can be inlined. */
589 extern int flag_implement_inlines;
591 /* Nonzero means that implicit instantiations will be emitted if needed. */
593 extern int flag_implicit_templates;
595 /* Nonzero means that implicit instantiations of inline templates will be
596 emitted if needed, even if instantiations of non-inline templates
599 extern int flag_implicit_inline_templates;
601 /* Nonzero means generate separate instantiation control files and
602 juggle them at link time. */
604 extern int flag_use_repository;
606 /* Nonzero if we want to issue diagnostics that the standard says are not
609 extern int flag_optional_diags;
611 /* Nonzero means we should attempt to elide constructors when possible. */
613 extern int flag_elide_constructors;
615 /* Nonzero means that member functions defined in class scope are
616 inline by default. */
618 extern int flag_default_inline;
620 /* Controls whether compiler generates 'type descriptor' that give
621 run-time type information. */
623 extern int flag_rtti;
625 /* Nonzero if we want to conserve space in the .o files. We do this
626 by putting uninitialized data and runtime initialized data into
627 .common instead of .data at the expense of not flagging multiple
630 extern int flag_conserve_space;
632 /* Nonzero if we want to obey access control semantics. */
634 extern int flag_access_control;
636 /* Nonzero if we want to check the return value of new and avoid calling
637 constructors if it is a null pointer. */
639 extern int flag_check_new;
641 /* The supported C++ dialects. */
646 /* Experimental features that are likely to become part of
651 /* The C++ dialect being used. C++98 is the default. */
652 extern enum cxx_dialect cxx_dialect;
654 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
655 initialization variables.
656 0: Old rules, set by -fno-for-scope.
657 2: New ISO rules, set by -ffor-scope.
658 1: Try to implement new ISO rules, but with backup compatibility
659 (and warnings). This is the default, for now. */
661 extern int flag_new_for_scope;
663 /* Nonzero if we want to emit defined symbols with common-like linkage as
664 weak symbols where possible, in order to conform to C++ semantics.
665 Otherwise, emit them as local symbols. */
667 extern int flag_weak;
669 /* 0 means we want the preprocessor to not emit line directives for
670 the current working directory. 1 means we want it to do it. -1
671 means we should decide depending on whether debugging information
672 is being emitted or not. */
674 extern int flag_working_directory;
676 /* Nonzero to use __cxa_atexit, rather than atexit, to register
677 destructors for local statics and global objects. */
679 extern int flag_use_cxa_atexit;
681 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
684 extern int flag_use_cxa_get_exception_ptr;
686 /* Nonzero means to implement standard semantics for exception
687 specifications, calling unexpected if an exception is thrown that
688 doesn't match the specification. Zero means to treat them as
689 assertions and optimize accordingly, but not check them. */
691 extern int flag_enforce_eh_specs;
693 /* Nonzero (the default) means to generate thread-safe code for
694 initializing local statics. */
696 extern int flag_threadsafe_statics;
698 /* Nonzero if we want to pretty-print template specializations as the
699 template signature followed by the arguments. */
701 extern int flag_pretty_templates;
703 /* Nonzero means warn about implicit declarations. */
705 extern int warn_implicit;
707 /* Warn about using __null (as NULL in C++) as sentinel. For code compiled
708 with GCC this doesn't matter as __null is guaranteed to have the right
711 extern int warn_strict_null_sentinel;
713 /* Maximum template instantiation depth. This limit is rather
714 arbitrary, but it exists to limit the time it takes to notice
715 infinite template instantiations. */
717 extern int max_tinst_depth;
719 /* Nonzero means the expression being parsed will never be evaluated.
720 This is a count, since unevaluated expressions can nest. */
722 extern int skip_evaluation;
724 /* Whether lexing has been completed, so subsequent preprocessor
725 errors should use the compiler's input_location. */
727 extern bool done_lexing;
729 /* C types are partitioned into three subsets: object, function, and
731 #define C_TYPE_OBJECT_P(type) \
732 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
734 #define C_TYPE_INCOMPLETE_P(type) \
735 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
737 #define C_TYPE_FUNCTION_P(type) \
738 (TREE_CODE (type) == FUNCTION_TYPE)
740 /* For convenience we define a single macro to identify the class of
741 object or incomplete types. */
742 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
743 (!C_TYPE_FUNCTION_P (type))
745 /* Attribute table common to the C front ends. */
746 extern const struct attribute_spec c_common_attribute_table[];
747 extern const struct attribute_spec c_common_format_attribute_table[];
749 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
750 ID is the identifier to use, NAME is the string.
751 TYPE_DEP indicates whether it depends on type of the function or not
752 (i.e. __PRETTY_FUNCTION__). */
754 extern tree (*make_fname_decl) (tree, int);
756 extern tree identifier_global_value (tree);
757 extern void record_builtin_type (enum rid, const char *, tree);
758 extern tree build_void_list_node (void);
759 extern void start_fname_decls (void);
760 extern void finish_fname_decls (void);
761 extern const char *fname_as_string (int);
762 extern tree fname_decl (location_t, unsigned, tree);
764 extern void check_function_arguments (tree, int, tree *, tree);
765 extern void check_function_arguments_recurse (void (*)
767 unsigned HOST_WIDE_INT),
769 unsigned HOST_WIDE_INT);
770 extern bool check_builtin_function_arguments (tree, int, tree *);
771 extern void check_function_format (tree, int, tree *);
772 extern void set_Wformat (int);
773 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
774 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
775 extern int c_common_handle_option (size_t code, const char *arg, int value);
776 extern bool c_common_missing_argument (const char *opt, size_t code);
777 extern tree c_common_type_for_mode (enum machine_mode, int);
778 extern tree c_common_type_for_size (unsigned int, int);
779 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
781 extern tree c_common_unsigned_type (tree);
782 extern tree c_common_signed_type (tree);
783 extern tree c_common_signed_or_unsigned_type (int, tree);
784 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
785 extern bool decl_with_nonnull_addr_p (const_tree);
786 extern tree c_fully_fold (tree, bool, bool *);
787 extern tree decl_constant_value_for_optimization (tree);
788 extern tree c_save_expr (tree);
789 extern tree c_common_truthvalue_conversion (location_t, tree);
790 extern void c_apply_type_quals_to_decl (int, tree);
791 extern tree c_sizeof_or_alignof_type (tree, bool, int);
792 extern tree c_alignof_expr (tree);
793 /* Print an error message for invalid operands to arith operation CODE.
794 NOP_EXPR is used as a special case (see truthvalue_conversion). */
795 extern void binary_op_error (location_t, enum tree_code, tree, tree);
796 extern tree fix_string_type (tree);
797 struct varray_head_tag;
798 extern void constant_expression_warning (tree);
799 extern void constant_expression_error (tree);
800 extern bool strict_aliasing_warning (tree, tree, tree);
801 extern void warnings_for_convert_and_check (tree, tree, tree);
802 extern tree convert_and_check (tree, tree);
803 extern void overflow_warning (tree);
804 extern void warn_logical_operator (location_t, enum tree_code,
805 enum tree_code, tree, enum tree_code, tree);
806 extern void check_main_parameter_types (tree decl);
807 extern bool c_determine_visibility (tree);
808 extern bool same_scalar_type_ignoring_signedness (tree, tree);
810 #define c_sizeof(T) c_sizeof_or_alignof_type (T, true, 1)
811 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
813 /* Subroutine of build_binary_op, used for certain operations. */
814 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
816 /* Subroutine of build_binary_op, used for comparison operations.
817 See if the operands have both been converted from subword integer types
818 and, if so, perhaps change them both back to their original type. */
819 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
821 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree);
823 /* Add qualifiers to a type, in the fashion for C. */
824 extern tree c_build_qualified_type (tree, int);
826 /* Build tree nodes and builtin functions common to both C and C++ language
828 extern void c_common_nodes_and_builtins (void);
830 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
832 extern void disable_builtin_function (const char *);
834 extern void set_compound_literal_name (tree decl);
836 extern tree build_va_arg (tree, tree);
838 extern unsigned int c_common_init_options (unsigned int, const char **);
839 extern bool c_common_post_options (const char **);
840 extern bool c_common_init (void);
841 extern void c_common_finish (void);
842 extern void c_common_parse_file (int);
843 extern alias_set_type c_common_get_alias_set (tree);
844 extern void c_register_builtin_type (tree, const char*);
845 extern bool c_promoting_integer_type_p (const_tree);
846 extern int self_promoting_args_p (const_tree);
847 extern tree strip_pointer_operator (tree);
848 extern tree strip_pointer_or_array_types (tree);
849 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
851 /* This is the basic parsing function. */
852 extern void c_parse_file (void);
853 /* This is misnamed, it actually performs end-of-compilation processing. */
854 extern void finish_file (void);
857 /* These macros provide convenient access to the various _STMT nodes. */
859 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
860 if a statement expression. */
861 #define STATEMENT_LIST_STMT_EXPR(NODE) \
862 TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
864 /* Nonzero if a label has been added to the statement list. */
865 #define STATEMENT_LIST_HAS_LABEL(NODE) \
866 TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
868 /* C_MAYBE_CONST_EXPR accessors. */
869 #define C_MAYBE_CONST_EXPR_PRE(NODE) \
870 TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
871 #define C_MAYBE_CONST_EXPR_EXPR(NODE) \
872 TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
873 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE) \
874 TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
875 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE) \
876 TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
877 #define EXPR_INT_CONST_OPERANDS(EXPR) \
878 (INTEGRAL_TYPE_P (TREE_TYPE (EXPR)) \
879 && (TREE_CODE (EXPR) == INTEGER_CST \
880 || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR \
881 && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
883 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */
884 #define DECL_C_BIT_FIELD(NODE) \
885 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
886 #define SET_DECL_C_BIT_FIELD(NODE) \
887 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
888 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
889 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
891 extern tree do_case (tree, tree);
892 extern tree build_stmt (enum tree_code, ...);
893 extern tree build_case_label (tree, tree, tree);
895 /* These functions must be defined by each front-end which implements
896 a variant of the C language. They are used in c-common.c. */
898 extern tree build_unary_op (location_t, enum tree_code, tree, int);
899 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
900 extern tree perform_integral_promotions (tree);
902 /* These functions must be defined by each front-end which implements
903 a variant of the C language. They are used by port files. */
905 extern tree default_conversion (tree);
907 /* Given two integer or real types, return the type for their sum.
908 Given two compatible ANSI C types, returns the merged type. */
910 extern tree common_type (tree, tree);
912 extern tree decl_constant_value (tree);
914 /* Handle increment and decrement of boolean types. */
915 extern tree boolean_increment (enum tree_code, tree);
917 extern int case_compare (splay_tree_key, splay_tree_key);
919 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
921 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
923 extern tree build_function_call (tree, tree);
925 extern tree build_function_call_vec (tree, VEC(tree,gc) *, VEC(tree,gc) *);
927 extern tree resolve_overloaded_builtin (tree, VEC(tree,gc) *);
929 extern tree finish_label_address_expr (tree, location_t);
931 /* Same function prototype, but the C and C++ front ends have
932 different implementations. Used in c-common.c. */
933 extern tree lookup_label (tree);
934 extern tree lookup_name (tree);
935 extern bool lvalue_p (const_tree);
937 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
938 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
940 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
942 extern void init_c_lex (void);
944 extern void c_cpp_builtins (cpp_reader *);
945 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
947 /* Positive if an implicit `extern "C"' scope has just been entered;
948 negative if such a scope has just been exited. */
949 extern GTY(()) int pending_lang_change;
951 /* Information recorded about each file examined during compilation. */
955 int time; /* Time spent in the file. */
957 /* Flags used only by C++.
958 INTERFACE_ONLY nonzero means that we are in an "interface" section
959 of the compiler. INTERFACE_UNKNOWN nonzero means we cannot trust
960 the value of INTERFACE_ONLY. If INTERFACE_UNKNOWN is zero and
961 INTERFACE_ONLY is zero, it means that we are responsible for
962 exporting definitions that others might need. */
963 short interface_only;
964 short interface_unknown;
967 struct c_fileinfo *get_fileinfo (const char *);
968 extern void dump_time_statistics (void);
970 extern bool c_dump_tree (void *, tree);
972 extern void c_warn_unused_result (gimple_seq);
974 extern void verify_sequence_points (tree);
976 extern tree fold_offsetof (tree, tree);
978 /* Places where an lvalue, or modifiable lvalue, may be required.
979 Used to select diagnostic messages in lvalue_error and
989 extern void lvalue_error (enum lvalue_use);
991 extern int complete_array_type (tree *, tree, bool);
993 extern tree builtin_type_for_size (int, bool);
995 extern void warn_array_subscript_with_type_char (tree);
996 extern void warn_about_parentheses (enum tree_code,
997 enum tree_code, tree,
998 enum tree_code, tree);
999 extern void warn_for_unused_label (tree label);
1000 extern void warn_for_div_by_zero (location_t, tree divisor);
1001 extern void warn_for_sign_compare (location_t,
1002 tree orig_op0, tree orig_op1,
1005 enum tree_code resultcode);
1006 extern void set_underlying_type (tree x);
1007 extern bool is_typedef_decl (tree x);
1009 /* In c-gimplify.c */
1010 extern void c_genericize (tree);
1011 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1012 extern tree c_build_bind_expr (tree, tree);
1015 extern void pch_init (void);
1016 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1017 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1019 extern void c_common_write_pch (void);
1020 extern void c_common_no_more_pch (void);
1021 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1022 extern void c_common_print_pch_checksum (FILE *f);
1024 /* In *-checksum.c */
1025 extern const unsigned char executable_checksum[16];
1027 /* In c-cppbuiltin.c */
1028 extern void builtin_define_std (const char *macro);
1029 extern void builtin_define_with_value (const char *, const char *, int);
1030 extern void c_stddef_cpp_builtins (void);
1031 extern void fe_file_change (const struct line_map *);
1032 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char);
1034 /* Objective-C / Objective-C++ entry points. */
1036 /* The following ObjC/ObjC++ functions are called by the C and/or C++
1037 front-ends; they all must have corresponding stubs in stub-objc.c. */
1038 extern tree objc_is_class_name (tree);
1039 extern tree objc_is_object_ptr (tree);
1040 extern void objc_check_decl (tree);
1041 extern int objc_is_reserved_word (tree);
1042 extern bool objc_compare_types (tree, tree, int, tree);
1043 extern void objc_volatilize_decl (tree);
1044 extern bool objc_type_quals_match (tree, tree);
1045 extern tree objc_rewrite_function_call (tree, tree);
1046 extern tree objc_message_selector (void);
1047 extern tree objc_lookup_ivar (tree, tree);
1048 extern void objc_clear_super_receiver (void);
1049 extern int objc_is_public (tree, tree);
1050 extern tree objc_is_id (tree);
1051 extern void objc_declare_alias (tree, tree);
1052 extern void objc_declare_class (tree);
1053 extern void objc_declare_protocols (tree);
1054 extern tree objc_build_message_expr (tree);
1055 extern tree objc_finish_message_expr (tree, tree, tree);
1056 extern tree objc_build_selector_expr (tree);
1057 extern tree objc_build_protocol_expr (tree);
1058 extern tree objc_build_encode_expr (tree);
1059 extern tree objc_build_string_object (tree);
1060 extern tree objc_get_protocol_qualified_type (tree, tree);
1061 extern tree objc_get_class_reference (tree);
1062 extern tree objc_get_class_ivars (tree);
1063 extern void objc_start_class_interface (tree, tree, tree);
1064 extern void objc_start_category_interface (tree, tree, tree);
1065 extern void objc_start_protocol (tree, tree);
1066 extern void objc_continue_interface (void);
1067 extern void objc_finish_interface (void);
1068 extern void objc_start_class_implementation (tree, tree);
1069 extern void objc_start_category_implementation (tree, tree);
1070 extern void objc_continue_implementation (void);
1071 extern void objc_finish_implementation (void);
1072 extern void objc_set_visibility (int);
1073 extern void objc_set_method_type (enum tree_code);
1074 extern tree objc_build_method_signature (tree, tree, tree, bool);
1075 extern void objc_add_method_declaration (tree);
1076 extern void objc_start_method_definition (tree);
1077 extern void objc_finish_method_definition (tree);
1078 extern void objc_add_instance_variable (tree);
1079 extern tree objc_build_keyword_decl (tree, tree, tree);
1080 extern tree objc_build_throw_stmt (tree);
1081 extern void objc_begin_try_stmt (location_t, tree);
1082 extern tree objc_finish_try_stmt (void);
1083 extern void objc_begin_catch_clause (tree);
1084 extern void objc_finish_catch_clause (void);
1085 extern void objc_build_finally_clause (location_t, tree);
1086 extern tree objc_build_synchronized (location_t, tree, tree);
1087 extern int objc_static_init_needed_p (void);
1088 extern tree objc_generate_static_init_call (tree);
1089 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
1091 /* The following are provided by the C and C++ front-ends, and called by
1093 extern void *objc_get_current_scope (void);
1094 extern void objc_mark_locals_volatile (void *);
1096 /* In c-ppoutput.c */
1097 extern void init_pp_output (FILE *);
1098 extern void preprocess_file (cpp_reader *);
1099 extern void pp_file_change (const struct line_map *);
1100 extern void pp_dir_change (cpp_reader *, const char *);
1101 extern bool check_missing_format_attribute (tree, tree);
1104 extern tree c_finish_omp_master (tree);
1105 extern tree c_finish_omp_critical (tree, tree);
1106 extern tree c_finish_omp_ordered (tree);
1107 extern void c_finish_omp_barrier (void);
1108 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
1109 extern void c_finish_omp_flush (void);
1110 extern void c_finish_omp_taskwait (void);
1111 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1112 extern void c_split_parallel_clauses (tree, tree *, tree *);
1113 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1115 /* Not in c-omp.c; provided by the front end. */
1116 extern bool c_omp_sharing_predetermined (tree);
1117 extern tree c_omp_remap_decl (tree, bool);
1119 /* In order for the format checking to accept the C frontend
1120 diagnostic framework extensions, you must include this file before
1121 toplev.h, not after. The C front end formats are a subset of those
1122 for C++, so they are the appropriate set to use in common code;
1123 cp-tree.h overrides this for C++. */
1124 #ifndef GCC_DIAG_STYLE
1125 #define GCC_DIAG_STYLE __gcc_cdiag__
1128 #endif /* ! GCC_C_COMMON_H */