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 GTY(()) c_common_identifier {
233 struct tree_common common;
234 struct cpp_hashnode node;
237 /* An entry in the reserved keyword table. */
239 struct c_common_resword
241 const char *const word;
242 ENUM_BITFIELD(rid) const rid : 16;
243 const unsigned int disable : 16;
246 /* Disable mask. Keywords are disabled if (reswords[i].disable &
247 mask) is _true_. Thus for keywords which are present in all
248 languages the disable field is zero. */
250 #define D_CONLY 0x001 /* C only (not in C++). */
251 #define D_CXXONLY 0x002 /* C++ only (not in C). */
252 #define D_C99 0x004 /* In C, C99 only. */
253 #define D_CXX0X 0x008 /* In C++, C++0X only. */
254 #define D_EXT 0x010 /* GCC extension. */
255 #define D_EXT89 0x020 /* GCC extension incorporated in C99. */
256 #define D_ASM 0x040 /* Disabled by -fno-asm. */
257 #define D_OBJC 0x080 /* In Objective C and neither C nor C++. */
258 #define D_CXX_OBJC 0x100 /* In Objective C, and C++, but not C. */
259 #define D_CXXWARN 0x200 /* In C warn with -Wcxx-compat. */
261 /* The reserved keyword table. */
262 extern const struct c_common_resword c_common_reswords[];
264 /* The number of items in the reserved keyword table. */
265 extern const unsigned int num_c_common_reswords;
267 #define char16_type_node c_global_trees[CTI_CHAR16_TYPE]
268 #define char32_type_node c_global_trees[CTI_CHAR32_TYPE]
269 #define wchar_type_node c_global_trees[CTI_WCHAR_TYPE]
270 #define underlying_wchar_type_node c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
271 #define wint_type_node c_global_trees[CTI_WINT_TYPE]
272 #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE]
273 #define unsigned_ptrdiff_type_node c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
274 #define intmax_type_node c_global_trees[CTI_INTMAX_TYPE]
275 #define uintmax_type_node c_global_trees[CTI_UINTMAX_TYPE]
276 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
277 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
279 #define sig_atomic_type_node c_global_trees[CTI_SIG_ATOMIC_TYPE]
280 #define int8_type_node c_global_trees[CTI_INT8_TYPE]
281 #define int16_type_node c_global_trees[CTI_INT16_TYPE]
282 #define int32_type_node c_global_trees[CTI_INT32_TYPE]
283 #define int64_type_node c_global_trees[CTI_INT64_TYPE]
284 #define uint8_type_node c_global_trees[CTI_UINT8_TYPE]
285 #define uint16_type_node c_global_trees[CTI_UINT16_TYPE]
286 #define c_uint32_type_node c_global_trees[CTI_UINT32_TYPE]
287 #define c_uint64_type_node c_global_trees[CTI_UINT64_TYPE]
288 #define int_least8_type_node c_global_trees[CTI_INT_LEAST8_TYPE]
289 #define int_least16_type_node c_global_trees[CTI_INT_LEAST16_TYPE]
290 #define int_least32_type_node c_global_trees[CTI_INT_LEAST32_TYPE]
291 #define int_least64_type_node c_global_trees[CTI_INT_LEAST64_TYPE]
292 #define uint_least8_type_node c_global_trees[CTI_UINT_LEAST8_TYPE]
293 #define uint_least16_type_node c_global_trees[CTI_UINT_LEAST16_TYPE]
294 #define uint_least32_type_node c_global_trees[CTI_UINT_LEAST32_TYPE]
295 #define uint_least64_type_node c_global_trees[CTI_UINT_LEAST64_TYPE]
296 #define int_fast8_type_node c_global_trees[CTI_INT_FAST8_TYPE]
297 #define int_fast16_type_node c_global_trees[CTI_INT_FAST16_TYPE]
298 #define int_fast32_type_node c_global_trees[CTI_INT_FAST32_TYPE]
299 #define int_fast64_type_node c_global_trees[CTI_INT_FAST64_TYPE]
300 #define uint_fast8_type_node c_global_trees[CTI_UINT_FAST8_TYPE]
301 #define uint_fast16_type_node c_global_trees[CTI_UINT_FAST16_TYPE]
302 #define uint_fast32_type_node c_global_trees[CTI_UINT_FAST32_TYPE]
303 #define uint_fast64_type_node c_global_trees[CTI_UINT_FAST64_TYPE]
304 #define intptr_type_node c_global_trees[CTI_INTPTR_TYPE]
305 #define uintptr_type_node c_global_trees[CTI_UINTPTR_TYPE]
307 #define truthvalue_type_node c_global_trees[CTI_TRUTHVALUE_TYPE]
308 #define truthvalue_true_node c_global_trees[CTI_TRUTHVALUE_TRUE]
309 #define truthvalue_false_node c_global_trees[CTI_TRUTHVALUE_FALSE]
311 #define char_array_type_node c_global_trees[CTI_CHAR_ARRAY_TYPE]
312 #define char16_array_type_node c_global_trees[CTI_CHAR16_ARRAY_TYPE]
313 #define char32_array_type_node c_global_trees[CTI_CHAR32_ARRAY_TYPE]
314 #define wchar_array_type_node c_global_trees[CTI_WCHAR_ARRAY_TYPE]
315 #define int_array_type_node c_global_trees[CTI_INT_ARRAY_TYPE]
316 #define string_type_node c_global_trees[CTI_STRING_TYPE]
317 #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE]
319 #define default_function_type c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
321 #define function_name_decl_node c_global_trees[CTI_FUNCTION_NAME_DECL]
322 #define pretty_function_name_decl_node c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
323 #define c99_function_name_decl_node c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
324 #define saved_function_name_decls c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
326 /* A node for `((void) 0)'. */
327 #define void_zero_node c_global_trees[CTI_VOID_ZERO]
329 /* The node for C++ `__null'. */
330 #define null_node c_global_trees[CTI_NULL]
332 extern GTY(()) tree c_global_trees[CTI_MAX];
334 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
335 tree for size reasons. */
336 struct GTY(()) sorted_fields_type {
338 tree GTY((length ("%h.len"))) elts[1];
341 /* Mark which labels are explicitly declared.
342 These may be shadowed, and may be referenced from nested functions. */
343 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
345 typedef enum c_language_kind
347 clk_c = 0, /* C90, C94 or C99 */
348 clk_objc = 1, /* clk_c with ObjC features. */
349 clk_cxx = 2, /* ANSI/ISO C++ */
350 clk_objcxx = 3 /* clk_cxx with ObjC features. */
354 /* To test for a specific language use c_language, defined by each
355 front end. For "ObjC features" or "not C++" use the macros. */
356 extern c_language_kind c_language;
358 #define c_dialect_cxx() (c_language & clk_cxx)
359 #define c_dialect_objc() (c_language & clk_objc)
361 /* Information about a statement tree. */
363 struct GTY(()) stmt_tree_s {
364 /* The current statement list being collected. */
365 tree x_cur_stmt_list;
367 /* In C++, Nonzero if we should treat statements as full
368 expressions. In particular, this variable is no-zero if at the
369 end of a statement we should destroy any temporaries created
370 during that statement. Similarly, if, at the end of a block, we
371 should destroy any local variables in this block. Normally, this
372 variable is nonzero, since those are the normal semantics of
375 However, in order to represent aggregate initialization code as
376 tree structure, we use statement-expressions. The statements
377 within the statement expression should not result in cleanups
378 being run until the entire enclosing statement is complete.
380 This flag has no effect in C. */
381 int stmts_are_full_exprs_p;
384 typedef struct stmt_tree_s *stmt_tree;
386 /* Global state pertinent to the current function. Some C dialects
387 extend this structure with additional fields. */
389 struct GTY(()) c_language_function {
390 /* While we are parsing the function, this contains information
391 about the statement-tree that we are building. */
392 struct stmt_tree_s x_stmt_tree;
395 /* When building a statement-tree, this is the current statement list
396 being collected. It's TREE_CHAIN is a back-pointer to the previous
399 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
401 /* Language-specific hooks. */
403 /* If non-NULL, this function is called after a precompile header file
405 extern void (*lang_post_pch_load) (void);
407 extern void push_file_scope (void);
408 extern void pop_file_scope (void);
409 extern stmt_tree current_stmt_tree (void);
410 extern tree push_stmt_list (void);
411 extern tree pop_stmt_list (tree);
412 extern tree add_stmt (tree);
413 extern void push_cleanup (tree, tree, bool);
414 extern tree pushdecl_top_level (tree);
415 extern tree pushdecl (tree);
416 extern tree build_modify_expr (location_t, tree, enum tree_code, tree, tree);
417 extern tree build_indirect_ref (location_t, tree, const char *);
419 extern int c_expand_decl (tree);
421 extern int field_decl_cmp (const void *, const void *);
422 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
424 extern bool has_c_linkage (const_tree decl);
426 /* Switches common to the C front ends. */
428 /* Nonzero if prepreprocessing only. */
430 extern int flag_preprocess_only;
432 /* Zero means that faster, ...NonNil variants of objc_msgSend...
433 calls will be used in ObjC; passing nil receivers to such calls
434 will most likely result in crashes. */
435 extern int flag_nil_receivers;
437 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
438 @try, etc.) in source code. */
439 extern int flag_objc_exceptions;
441 /* Nonzero means that we generate NeXT setjmp based exceptions. */
442 extern int flag_objc_sjlj_exceptions;
444 /* Nonzero means that code generation will be altered to support
445 "zero-link" execution. This currently affects ObjC only, but may
446 affect other languages in the future. */
447 extern int flag_zero_link;
449 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
450 unit. It will inform the ObjC runtime that class definition(s) herein
451 contained are to replace one(s) previously loaded. */
452 extern int flag_replace_objc_classes;
454 /* Nonzero means don't output line number information. */
456 extern char flag_no_line_commands;
458 /* Nonzero causes -E output not to be done, but directives such as
459 #define that have side effects are still obeyed. */
461 extern char flag_no_output;
463 /* Nonzero means dump macros in some fashion; contains the 'D', 'M',
464 'N' or 'U' of the command line switch. */
466 extern char flag_dump_macros;
468 /* Nonzero means pass #include lines through to the output. */
470 extern char flag_dump_includes;
472 /* Nonzero means process PCH files while preprocessing. */
474 extern bool flag_pch_preprocess;
476 /* The file name to which we should write a precompiled header, or
477 NULL if no header will be written in this compile. */
479 extern const char *pch_file;
481 /* Nonzero if an ISO standard was selected. It rejects macros in the
486 /* Nonzero if -undef was given. It suppresses target built-in macros
489 extern int flag_undef;
491 /* Nonzero means don't recognize the non-ANSI builtin functions. */
493 extern int flag_no_builtin;
495 /* Nonzero means don't recognize the non-ANSI builtin functions.
498 extern int flag_no_nonansi_builtin;
500 /* Nonzero means give `double' the same size as `float'. */
502 extern int flag_short_double;
504 /* Nonzero means give `wchar_t' the same size as `short'. */
506 extern int flag_short_wchar;
508 /* Nonzero means allow implicit conversions between vectors with
509 differing numbers of subparts and/or differing element types. */
510 extern int flag_lax_vector_conversions;
512 /* Nonzero means allow Microsoft extensions without warnings or errors. */
513 extern int flag_ms_extensions;
515 /* Nonzero means don't recognize the keyword `asm'. */
517 extern int flag_no_asm;
519 /* Nonzero means give string constants the type `const char *', as mandated
522 extern int flag_const_strings;
524 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
526 extern int flag_signed_bitfields;
528 /* Warn about #pragma directives that are not recognized. */
530 extern int warn_unknown_pragmas; /* Tri state variable. */
532 /* Warn about format/argument anomalies in calls to formatted I/O functions
533 (*printf, *scanf, strftime, strfmon, etc.). */
535 extern int warn_format;
538 /* C/ObjC language option variables. */
541 /* Nonzero means allow type mismatches in conditional expressions;
542 just make their values `void'. */
544 extern int flag_cond_mismatch;
546 /* Nonzero means enable C89 Amendment 1 features. */
548 extern int flag_isoc94;
550 /* Nonzero means use the ISO C99 dialect of C. */
552 extern int flag_isoc99;
554 /* Nonzero means that we have builtin functions, and main is an int. */
556 extern int flag_hosted;
558 /* ObjC language option variables. */
561 /* Open and close the file for outputting class declarations, if
564 extern int flag_gen_declaration;
566 /* Tells the compiler that this is a special run. Do not perform any
567 compiling, instead we are to test some platform dependent features
568 and output a C header file with appropriate definitions. */
570 extern int print_struct_values;
572 /* ???. Undocumented. */
574 extern const char *constant_string_class_name;
577 /* C++ language option variables. */
580 /* Nonzero means don't recognize any extension keywords. */
582 extern int flag_no_gnu_keywords;
584 /* Nonzero means do emit exported implementations of functions even if
585 they can be inlined. */
587 extern int flag_implement_inlines;
589 /* Nonzero means that implicit instantiations will be emitted if needed. */
591 extern int flag_implicit_templates;
593 /* Nonzero means that implicit instantiations of inline templates will be
594 emitted if needed, even if instantiations of non-inline templates
597 extern int flag_implicit_inline_templates;
599 /* Nonzero means generate separate instantiation control files and
600 juggle them at link time. */
602 extern int flag_use_repository;
604 /* Nonzero if we want to issue diagnostics that the standard says are not
607 extern int flag_optional_diags;
609 /* Nonzero means we should attempt to elide constructors when possible. */
611 extern int flag_elide_constructors;
613 /* Nonzero means that member functions defined in class scope are
614 inline by default. */
616 extern int flag_default_inline;
618 /* Controls whether compiler generates 'type descriptor' that give
619 run-time type information. */
621 extern int flag_rtti;
623 /* Nonzero if we want to conserve space in the .o files. We do this
624 by putting uninitialized data and runtime initialized data into
625 .common instead of .data at the expense of not flagging multiple
628 extern int flag_conserve_space;
630 /* Nonzero if we want to obey access control semantics. */
632 extern int flag_access_control;
634 /* Nonzero if we want to check the return value of new and avoid calling
635 constructors if it is a null pointer. */
637 extern int flag_check_new;
639 /* The supported C++ dialects. */
644 /* Experimental features that are likely to become part of
649 /* The C++ dialect being used. C++98 is the default. */
650 extern enum cxx_dialect cxx_dialect;
652 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
653 initialization variables.
654 0: Old rules, set by -fno-for-scope.
655 2: New ISO rules, set by -ffor-scope.
656 1: Try to implement new ISO rules, but with backup compatibility
657 (and warnings). This is the default, for now. */
659 extern int flag_new_for_scope;
661 /* Nonzero if we want to emit defined symbols with common-like linkage as
662 weak symbols where possible, in order to conform to C++ semantics.
663 Otherwise, emit them as local symbols. */
665 extern int flag_weak;
667 /* 0 means we want the preprocessor to not emit line directives for
668 the current working directory. 1 means we want it to do it. -1
669 means we should decide depending on whether debugging information
670 is being emitted or not. */
672 extern int flag_working_directory;
674 /* Nonzero to use __cxa_atexit, rather than atexit, to register
675 destructors for local statics and global objects. */
677 extern int flag_use_cxa_atexit;
679 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
682 extern int flag_use_cxa_get_exception_ptr;
684 /* Nonzero means to implement standard semantics for exception
685 specifications, calling unexpected if an exception is thrown that
686 doesn't match the specification. Zero means to treat them as
687 assertions and optimize accordingly, but not check them. */
689 extern int flag_enforce_eh_specs;
691 /* Nonzero (the default) means to generate thread-safe code for
692 initializing local statics. */
694 extern int flag_threadsafe_statics;
696 /* Nonzero if we want to pretty-print template specializations as the
697 template signature followed by the arguments. */
699 extern int flag_pretty_templates;
701 /* Nonzero means warn about implicit declarations. */
703 extern int warn_implicit;
705 /* Warn about using __null (as NULL in C++) as sentinel. For code compiled
706 with GCC this doesn't matter as __null is guaranteed to have the right
709 extern int warn_strict_null_sentinel;
711 /* Maximum template instantiation depth. This limit is rather
712 arbitrary, but it exists to limit the time it takes to notice
713 infinite template instantiations. */
715 extern int max_tinst_depth;
717 /* Nonzero means the expression being parsed will never be evaluated.
718 This is a count, since unevaluated expressions can nest. */
720 extern int skip_evaluation;
722 /* Whether lexing has been completed, so subsequent preprocessor
723 errors should use the compiler's input_location. */
725 extern bool done_lexing;
727 /* C types are partitioned into three subsets: object, function, and
729 #define C_TYPE_OBJECT_P(type) \
730 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
732 #define C_TYPE_INCOMPLETE_P(type) \
733 (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
735 #define C_TYPE_FUNCTION_P(type) \
736 (TREE_CODE (type) == FUNCTION_TYPE)
738 /* For convenience we define a single macro to identify the class of
739 object or incomplete types. */
740 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
741 (!C_TYPE_FUNCTION_P (type))
743 /* Attribute table common to the C front ends. */
744 extern const struct attribute_spec c_common_attribute_table[];
745 extern const struct attribute_spec c_common_format_attribute_table[];
747 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
748 ID is the identifier to use, NAME is the string.
749 TYPE_DEP indicates whether it depends on type of the function or not
750 (i.e. __PRETTY_FUNCTION__). */
752 extern tree (*make_fname_decl) (tree, int);
754 extern tree identifier_global_value (tree);
755 extern void record_builtin_type (enum rid, const char *, tree);
756 extern tree build_void_list_node (void);
757 extern void start_fname_decls (void);
758 extern void finish_fname_decls (void);
759 extern const char *fname_as_string (int);
760 extern tree fname_decl (location_t, unsigned, tree);
762 extern void check_function_arguments (tree, int, tree *, tree);
763 extern void check_function_arguments_recurse (void (*)
765 unsigned HOST_WIDE_INT),
767 unsigned HOST_WIDE_INT);
768 extern bool check_builtin_function_arguments (tree, int, tree *);
769 extern void check_function_format (tree, int, tree *);
770 extern void set_Wformat (int);
771 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
772 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
773 extern int c_common_handle_option (size_t code, const char *arg, int value);
774 extern bool c_common_missing_argument (const char *opt, size_t code);
775 extern tree c_common_type_for_mode (enum machine_mode, int);
776 extern tree c_common_type_for_size (unsigned int, int);
777 extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
779 extern tree c_common_unsigned_type (tree);
780 extern tree c_common_signed_type (tree);
781 extern tree c_common_signed_or_unsigned_type (int, tree);
782 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
783 extern bool decl_with_nonnull_addr_p (const_tree);
784 extern tree c_fully_fold (tree, bool, bool *);
785 extern tree decl_constant_value_for_optimization (tree);
786 extern tree c_save_expr (tree);
787 extern tree c_common_truthvalue_conversion (location_t, tree);
788 extern void c_apply_type_quals_to_decl (int, tree);
789 extern tree c_sizeof_or_alignof_type (tree, bool, int);
790 extern tree c_alignof_expr (tree);
791 /* Print an error message for invalid operands to arith operation CODE.
792 NOP_EXPR is used as a special case (see truthvalue_conversion). */
793 extern void binary_op_error (location_t, enum tree_code, tree, tree);
794 extern tree fix_string_type (tree);
795 struct varray_head_tag;
796 extern void constant_expression_warning (tree);
797 extern void constant_expression_error (tree);
798 extern bool strict_aliasing_warning (tree, tree, tree);
799 extern void warnings_for_convert_and_check (tree, tree, tree);
800 extern tree convert_and_check (tree, tree);
801 extern void overflow_warning (tree);
802 extern void warn_logical_operator (location_t, enum tree_code,
803 enum tree_code, tree, enum tree_code, tree);
804 extern void check_main_parameter_types (tree decl);
805 extern bool c_determine_visibility (tree);
806 extern bool same_scalar_type_ignoring_signedness (tree, tree);
808 #define c_sizeof(T) c_sizeof_or_alignof_type (T, true, 1)
809 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
811 /* Subroutine of build_binary_op, used for certain operations. */
812 extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
814 /* Subroutine of build_binary_op, used for comparison operations.
815 See if the operands have both been converted from subword integer types
816 and, if so, perhaps change them both back to their original type. */
817 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
819 extern tree pointer_int_sum (location_t, enum tree_code, tree, tree);
821 /* Add qualifiers to a type, in the fashion for C. */
822 extern tree c_build_qualified_type (tree, int);
824 /* Build tree nodes and builtin functions common to both C and C++ language
826 extern void c_common_nodes_and_builtins (void);
828 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
830 extern void disable_builtin_function (const char *);
832 extern void set_compound_literal_name (tree decl);
834 extern tree build_va_arg (tree, tree);
836 extern unsigned int c_common_init_options (unsigned int, const char **);
837 extern bool c_common_post_options (const char **);
838 extern bool c_common_init (void);
839 extern void c_common_finish (void);
840 extern void c_common_parse_file (int);
841 extern alias_set_type c_common_get_alias_set (tree);
842 extern void c_register_builtin_type (tree, const char*);
843 extern bool c_promoting_integer_type_p (const_tree);
844 extern int self_promoting_args_p (const_tree);
845 extern tree strip_pointer_operator (tree);
846 extern tree strip_pointer_or_array_types (tree);
847 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
849 /* This is the basic parsing function. */
850 extern void c_parse_file (void);
851 /* This is misnamed, it actually performs end-of-compilation processing. */
852 extern void finish_file (void);
855 /* These macros provide convenient access to the various _STMT nodes. */
857 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
858 if a statement expression. */
859 #define STATEMENT_LIST_STMT_EXPR(NODE) \
860 TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
862 /* Nonzero if a label has been added to the statement list. */
863 #define STATEMENT_LIST_HAS_LABEL(NODE) \
864 TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
866 /* C_MAYBE_CONST_EXPR accessors. */
867 #define C_MAYBE_CONST_EXPR_PRE(NODE) \
868 TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
869 #define C_MAYBE_CONST_EXPR_EXPR(NODE) \
870 TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
871 #define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE) \
872 TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
873 #define C_MAYBE_CONST_EXPR_NON_CONST(NODE) \
874 TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
875 #define EXPR_INT_CONST_OPERANDS(EXPR) \
876 (INTEGRAL_TYPE_P (TREE_TYPE (EXPR)) \
877 && (TREE_CODE (EXPR) == INTEGER_CST \
878 || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR \
879 && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
881 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */
882 #define DECL_C_BIT_FIELD(NODE) \
883 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
884 #define SET_DECL_C_BIT_FIELD(NODE) \
885 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
886 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
887 (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
889 extern tree do_case (tree, tree);
890 extern tree build_stmt (enum tree_code, ...);
891 extern tree build_case_label (tree, tree, tree);
893 /* These functions must be defined by each front-end which implements
894 a variant of the C language. They are used in c-common.c. */
896 extern tree build_unary_op (location_t, enum tree_code, tree, int);
897 extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
898 extern tree perform_integral_promotions (tree);
900 /* These functions must be defined by each front-end which implements
901 a variant of the C language. They are used by port files. */
903 extern tree default_conversion (tree);
905 /* Given two integer or real types, return the type for their sum.
906 Given two compatible ANSI C types, returns the merged type. */
908 extern tree common_type (tree, tree);
910 extern tree decl_constant_value (tree);
912 /* Handle increment and decrement of boolean types. */
913 extern tree boolean_increment (enum tree_code, tree);
915 extern int case_compare (splay_tree_key, splay_tree_key);
917 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
919 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
921 extern tree build_function_call (tree, tree);
923 extern tree build_function_call_vec (tree, VEC(tree,gc) *, VEC(tree,gc) *);
925 extern tree resolve_overloaded_builtin (tree, VEC(tree,gc) *);
927 extern tree finish_label_address_expr (tree, location_t);
929 /* Same function prototype, but the C and C++ front ends have
930 different implementations. Used in c-common.c. */
931 extern tree lookup_label (tree);
932 extern tree lookup_name (tree);
933 extern bool lvalue_p (const_tree);
935 extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
936 extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
938 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
940 extern void init_c_lex (void);
942 extern void c_cpp_builtins (cpp_reader *);
943 extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
945 /* Positive if an implicit `extern "C"' scope has just been entered;
946 negative if such a scope has just been exited. */
947 extern GTY(()) int pending_lang_change;
949 /* Information recorded about each file examined during compilation. */
953 int time; /* Time spent in the file. */
955 /* Flags used only by C++.
956 INTERFACE_ONLY nonzero means that we are in an "interface" section
957 of the compiler. INTERFACE_UNKNOWN nonzero means we cannot trust
958 the value of INTERFACE_ONLY. If INTERFACE_UNKNOWN is zero and
959 INTERFACE_ONLY is zero, it means that we are responsible for
960 exporting definitions that others might need. */
961 short interface_only;
962 short interface_unknown;
965 struct c_fileinfo *get_fileinfo (const char *);
966 extern void dump_time_statistics (void);
968 extern bool c_dump_tree (void *, tree);
970 extern void c_warn_unused_result (gimple_seq);
972 extern void verify_sequence_points (tree);
974 extern tree fold_offsetof (tree, tree);
976 /* Places where an lvalue, or modifiable lvalue, may be required.
977 Used to select diagnostic messages in lvalue_error and
987 extern void lvalue_error (enum lvalue_use);
989 extern int complete_array_type (tree *, tree, bool);
991 extern tree builtin_type_for_size (int, bool);
993 extern void warn_array_subscript_with_type_char (tree);
994 extern void warn_about_parentheses (enum tree_code,
995 enum tree_code, tree,
996 enum tree_code, tree);
997 extern void warn_for_unused_label (tree label);
998 extern void warn_for_div_by_zero (location_t, tree divisor);
999 extern void warn_for_sign_compare (location_t,
1000 tree orig_op0, tree orig_op1,
1003 enum tree_code resultcode);
1004 extern void set_underlying_type (tree x);
1005 extern bool is_typedef_decl (tree x);
1007 /* In c-gimplify.c */
1008 extern void c_genericize (tree);
1009 extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1010 extern tree c_build_bind_expr (tree, tree);
1013 extern void pch_init (void);
1014 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1015 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1017 extern void c_common_write_pch (void);
1018 extern void c_common_no_more_pch (void);
1019 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1020 extern void c_common_print_pch_checksum (FILE *f);
1022 /* In *-checksum.c */
1023 extern const unsigned char executable_checksum[16];
1025 /* In c-cppbuiltin.c */
1026 extern void builtin_define_std (const char *macro);
1027 extern void builtin_define_with_value (const char *, const char *, int);
1028 extern void c_stddef_cpp_builtins (void);
1029 extern void fe_file_change (const struct line_map *);
1030 extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char);
1032 /* Objective-C / Objective-C++ entry points. */
1034 /* The following ObjC/ObjC++ functions are called by the C and/or C++
1035 front-ends; they all must have corresponding stubs in stub-objc.c. */
1036 extern tree objc_is_class_name (tree);
1037 extern tree objc_is_object_ptr (tree);
1038 extern void objc_check_decl (tree);
1039 extern int objc_is_reserved_word (tree);
1040 extern bool objc_compare_types (tree, tree, int, tree);
1041 extern void objc_volatilize_decl (tree);
1042 extern bool objc_type_quals_match (tree, tree);
1043 extern tree objc_rewrite_function_call (tree, tree);
1044 extern tree objc_message_selector (void);
1045 extern tree objc_lookup_ivar (tree, tree);
1046 extern void objc_clear_super_receiver (void);
1047 extern int objc_is_public (tree, tree);
1048 extern tree objc_is_id (tree);
1049 extern void objc_declare_alias (tree, tree);
1050 extern void objc_declare_class (tree);
1051 extern void objc_declare_protocols (tree);
1052 extern tree objc_build_message_expr (tree);
1053 extern tree objc_finish_message_expr (tree, tree, tree);
1054 extern tree objc_build_selector_expr (tree);
1055 extern tree objc_build_protocol_expr (tree);
1056 extern tree objc_build_encode_expr (tree);
1057 extern tree objc_build_string_object (tree);
1058 extern tree objc_get_protocol_qualified_type (tree, tree);
1059 extern tree objc_get_class_reference (tree);
1060 extern tree objc_get_class_ivars (tree);
1061 extern void objc_start_class_interface (tree, tree, tree);
1062 extern void objc_start_category_interface (tree, tree, tree);
1063 extern void objc_start_protocol (tree, tree);
1064 extern void objc_continue_interface (void);
1065 extern void objc_finish_interface (void);
1066 extern void objc_start_class_implementation (tree, tree);
1067 extern void objc_start_category_implementation (tree, tree);
1068 extern void objc_continue_implementation (void);
1069 extern void objc_finish_implementation (void);
1070 extern void objc_set_visibility (int);
1071 extern void objc_set_method_type (enum tree_code);
1072 extern tree objc_build_method_signature (tree, tree, tree, bool);
1073 extern void objc_add_method_declaration (tree);
1074 extern void objc_start_method_definition (tree);
1075 extern void objc_finish_method_definition (tree);
1076 extern void objc_add_instance_variable (tree);
1077 extern tree objc_build_keyword_decl (tree, tree, tree);
1078 extern tree objc_build_throw_stmt (tree);
1079 extern void objc_begin_try_stmt (location_t, tree);
1080 extern tree objc_finish_try_stmt (void);
1081 extern void objc_begin_catch_clause (tree);
1082 extern void objc_finish_catch_clause (void);
1083 extern void objc_build_finally_clause (location_t, tree);
1084 extern tree objc_build_synchronized (location_t, tree, tree);
1085 extern int objc_static_init_needed_p (void);
1086 extern tree objc_generate_static_init_call (tree);
1087 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
1089 /* The following are provided by the C and C++ front-ends, and called by
1091 extern void *objc_get_current_scope (void);
1092 extern void objc_mark_locals_volatile (void *);
1094 /* In c-ppoutput.c */
1095 extern void init_pp_output (FILE *);
1096 extern void preprocess_file (cpp_reader *);
1097 extern void pp_file_change (const struct line_map *);
1098 extern void pp_dir_change (cpp_reader *, const char *);
1099 extern bool check_missing_format_attribute (tree, tree);
1102 extern tree c_finish_omp_master (tree);
1103 extern tree c_finish_omp_critical (tree, tree);
1104 extern tree c_finish_omp_ordered (tree);
1105 extern void c_finish_omp_barrier (void);
1106 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
1107 extern void c_finish_omp_flush (void);
1108 extern void c_finish_omp_taskwait (void);
1109 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1110 extern void c_split_parallel_clauses (tree, tree *, tree *);
1111 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1113 /* Not in c-omp.c; provided by the front end. */
1114 extern bool c_omp_sharing_predetermined (tree);
1115 extern tree c_omp_remap_decl (tree, bool);
1117 /* In order for the format checking to accept the C frontend
1118 diagnostic framework extensions, you must include this file before
1119 toplev.h, not after. The C front end formats are a subset of those
1120 for C++, so they are the appropriate set to use in common code;
1121 cp-tree.h overrides this for C++. */
1122 #ifndef GCC_DIAG_STYLE
1123 #define GCC_DIAG_STYLE __gcc_cdiag__
1126 #endif /* ! GCC_C_COMMON_H */