source: arduino-1-6-7/trunk/fuentes/arduino-ide-amd64/hardware/tools/avr/lib/gcc/avr/4.8.1/plugin/include/c-family/c-common.h @ 46

Last change on this file since 46 was 46, checked in by jrpelegrina, 4 years ago

First release to Xenial

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1/* Definitions for c-common.c.
2   Copyright (C) 1987-2013 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3.  If not see
18<http://www.gnu.org/licenses/>.  */
19
20#ifndef GCC_C_COMMON_H
21#define GCC_C_COMMON_H
22
23#include "splay-tree.h"
24#include "cpplib.h"
25#include "ggc.h"
26#include "tree.h"
27
28/* In order for the format checking to accept the C frontend
29   diagnostic framework extensions, you must include this file before
30   diagnostic-core.h, not after.  The C front end formats are a subset of those
31   for C++, so they are the appropriate set to use in common code;
32   cp-tree.h overrides this for C++.  */
33#if defined(GCC_DIAGNOSTIC_CORE_H)
34#error \
35In order for the format checking to accept the C front end diagnostic \
36framework extensions, you must include this file before diagnostic-core.h \
37never after.
38#endif
39#ifndef GCC_DIAG_STYLE
40#define GCC_DIAG_STYLE __gcc_cdiag__
41#endif
42#include "diagnostic-core.h"
43
44/* Usage of TREE_LANG_FLAG_?:
45   0: IDENTIFIER_MARKED (used by search routines).
46      C_MAYBE_CONST_EXPR_INT_OPERANDS (in C_MAYBE_CONST_EXPR, for C)
47   1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
48      STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
49      C_MAYBE_CONST_EXPR_NON_CONST (in C_MAYBE_CONST_EXPR, for C)
50   2: unused
51   3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
52   4: unused
53*/
54
55/* Reserved identifiers.  This is the union of all the keywords for C,
56   C++, and Objective-C.  All the type modifiers have to be in one
57   block at the beginning, because they are used as mask bits.  There
58   are 28 type modifiers; if we add many more we will have to redesign
59   the mask mechanism.  */
60
61enum rid
62{
63  /* Modifiers: */
64  /* C, in empirical order of frequency.  */
65  RID_STATIC = 0,
66  RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
67  RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
68  RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
69  RID_NORETURN,
70
71  /* C extensions */
72  RID_COMPLEX, RID_THREAD, RID_SAT,
73
74  /* C++ */
75  RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
76
77  /* ObjC ("PQ" reserved words - they do not appear after a '@' and
78     are keywords only in specific contexts)  */
79  RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
80
81  /* ObjC ("PATTR" reserved words - they do not appear after a '@'
82     and are keywords only as property attributes)  */
83  RID_GETTER, RID_SETTER,
84  RID_READONLY, RID_READWRITE,
85  RID_ASSIGN, RID_RETAIN, RID_COPY,
86  RID_NONATOMIC,
87
88  /* C (reserved and imaginary types not implemented, so any use is a
89     syntax error) */
90  RID_IMAGINARY,
91
92  /* C */
93  RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
94  RID_INT128,
95  RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
96  RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
97  RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
98  RID_SIZEOF,
99
100  /* C extensions */
101  RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
102  RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
103  RID_TYPES_COMPATIBLE_P,      RID_BUILTIN_COMPLEX,          RID_BUILTIN_SHUFFLE,
104  RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
105  RID_FRACT, RID_ACCUM,
106
107  /* C11 */
108  RID_ALIGNAS,
109
110  /* This means to warn that this is a C++ keyword, and then treat it
111     as a normal identifier.  */
112  RID_CXX_COMPAT_WARN,
113
114  /* GNU transactional memory extension */
115  RID_TRANSACTION_ATOMIC, RID_TRANSACTION_RELAXED, RID_TRANSACTION_CANCEL,
116
117  /* Too many ways of getting the name of a function as a string */
118  RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
119
120  /* C++ (some of these are keywords in Objective-C as well, but only
121     if they appear after a '@') */
122  RID_BOOL,     RID_WCHAR,    RID_CLASS,
123  RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
124  RID_TEMPLATE, RID_NULL,     RID_CATCH,
125  RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
126  RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
127  RID_THIS,     RID_THROW,    RID_TRUE,
128  RID_TRY,      RID_TYPENAME, RID_TYPEID,
129  RID_USING,    RID_CHAR16,   RID_CHAR32,
130
131  /* casts */
132  RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
133
134  /* C++ extensions */
135  RID_BASES,                   RID_DIRECT_BASES,
136  RID_HAS_NOTHROW_ASSIGN,      RID_HAS_NOTHROW_CONSTRUCTOR,
137  RID_HAS_NOTHROW_COPY,        RID_HAS_TRIVIAL_ASSIGN,
138  RID_HAS_TRIVIAL_CONSTRUCTOR, RID_HAS_TRIVIAL_COPY,
139  RID_HAS_TRIVIAL_DESTRUCTOR,  RID_HAS_VIRTUAL_DESTRUCTOR,
140  RID_IS_ABSTRACT,             RID_IS_BASE_OF,
141  RID_IS_CLASS,                RID_IS_CONVERTIBLE_TO,
142  RID_IS_EMPTY,                RID_IS_ENUM,
143  RID_IS_FINAL,                RID_IS_LITERAL_TYPE,
144  RID_IS_POD,                  RID_IS_POLYMORPHIC,
145  RID_IS_STD_LAYOUT,           RID_IS_TRIVIAL,
146  RID_IS_UNION,                RID_UNDERLYING_TYPE,
147
148  /* C++11 */
149  RID_CONSTEXPR, RID_DECLTYPE, RID_NOEXCEPT, RID_NULLPTR, RID_STATIC_ASSERT,
150
151  /* Objective-C ("AT" reserved words - they are only keywords when
152     they follow '@')  */
153  RID_AT_ENCODE,   RID_AT_END,
154  RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
155  RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,  RID_AT_PACKAGE,
156  RID_AT_PROTOCOL, RID_AT_SELECTOR,
157  RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
158  RID_AT_FINALLY,  RID_AT_SYNCHRONIZED, 
159  RID_AT_OPTIONAL, RID_AT_REQUIRED, RID_AT_PROPERTY,
160  RID_AT_SYNTHESIZE, RID_AT_DYNAMIC,
161  RID_AT_INTERFACE,
162  RID_AT_IMPLEMENTATION,
163
164  /* Named address support, mapping the keyword to a particular named address
165     number.  Named address space 0 is reserved for the generic address.  If
166     there are more than 254 named addresses, the addr_space_t type will need
167     to be grown from an unsigned char to unsigned short.  */
168  RID_ADDR_SPACE_0,             /* generic address */
169  RID_ADDR_SPACE_1,
170  RID_ADDR_SPACE_2,
171  RID_ADDR_SPACE_3,
172  RID_ADDR_SPACE_4,
173  RID_ADDR_SPACE_5,
174  RID_ADDR_SPACE_6,
175  RID_ADDR_SPACE_7,
176  RID_ADDR_SPACE_8,
177  RID_ADDR_SPACE_9,
178  RID_ADDR_SPACE_10,
179  RID_ADDR_SPACE_11,
180  RID_ADDR_SPACE_12,
181  RID_ADDR_SPACE_13,
182  RID_ADDR_SPACE_14,
183  RID_ADDR_SPACE_15,
184
185  RID_FIRST_ADDR_SPACE = RID_ADDR_SPACE_0,
186  RID_LAST_ADDR_SPACE = RID_ADDR_SPACE_15,
187
188  RID_MAX,
189
190  RID_FIRST_MODIFIER = RID_STATIC,
191  RID_LAST_MODIFIER = RID_ONEWAY,
192
193  RID_FIRST_CXX0X = RID_CONSTEXPR,
194  RID_LAST_CXX0X = RID_STATIC_ASSERT,
195  RID_FIRST_AT = RID_AT_ENCODE,
196  RID_LAST_AT = RID_AT_IMPLEMENTATION,
197  RID_FIRST_PQ = RID_IN,
198  RID_LAST_PQ = RID_ONEWAY,
199  RID_FIRST_PATTR = RID_GETTER,
200  RID_LAST_PATTR = RID_NONATOMIC
201};
202
203#define OBJC_IS_AT_KEYWORD(rid) \
204  ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
205   (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
206
207#define OBJC_IS_PQ_KEYWORD(rid) \
208  ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
209   (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
210
211#define OBJC_IS_PATTR_KEYWORD(rid) \
212  ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PATTR && \
213   (unsigned int) (rid) <= (unsigned int) RID_LAST_PATTR)
214
215/* OBJC_IS_CXX_KEYWORD recognizes the 'CXX_OBJC' keywords (such as
216   'class') which are shared in a subtle way between Objective-C and
217   C++.  When the lexer is lexing in Objective-C/Objective-C++, if it
218   finds '@' followed by one of these identifiers (eg, '@class'), it
219   recognizes the whole as an Objective-C keyword.  If the identifier
220   is found elsewhere, it follows the rules of the C/C++ language.
221 */
222#define OBJC_IS_CXX_KEYWORD(rid) \
223  (rid == RID_CLASS                                                     \
224   || rid == RID_PUBLIC || rid == RID_PROTECTED || rid == RID_PRIVATE   \
225   || rid == RID_TRY || rid == RID_THROW || rid == RID_CATCH)
226
227/* The elements of `ridpointers' are identifier nodes for the reserved
228   type names and storage classes.  It is indexed by a RID_... value.  */
229extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
230
231/* Standard named or nameless data types of the C compiler.  */
232
233enum c_tree_index
234{
235    CTI_CHAR16_TYPE,
236    CTI_CHAR32_TYPE,
237    CTI_WCHAR_TYPE,
238    CTI_UNDERLYING_WCHAR_TYPE,
239    CTI_WINT_TYPE,
240    CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
241    CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
242    CTI_INTMAX_TYPE,
243    CTI_UINTMAX_TYPE,
244    CTI_WIDEST_INT_LIT_TYPE,
245    CTI_WIDEST_UINT_LIT_TYPE,
246
247    /* Types for <stdint.h>, that may not be defined on all
248       targets.  */
249    CTI_SIG_ATOMIC_TYPE,
250    CTI_INT8_TYPE,
251    CTI_INT16_TYPE,
252    CTI_INT32_TYPE,
253    CTI_INT64_TYPE,
254    CTI_UINT8_TYPE,
255    CTI_UINT16_TYPE,
256    CTI_UINT32_TYPE,
257    CTI_UINT64_TYPE,
258    CTI_INT_LEAST8_TYPE,
259    CTI_INT_LEAST16_TYPE,
260    CTI_INT_LEAST32_TYPE,
261    CTI_INT_LEAST64_TYPE,
262    CTI_UINT_LEAST8_TYPE,
263    CTI_UINT_LEAST16_TYPE,
264    CTI_UINT_LEAST32_TYPE,
265    CTI_UINT_LEAST64_TYPE,
266    CTI_INT_FAST8_TYPE,
267    CTI_INT_FAST16_TYPE,
268    CTI_INT_FAST32_TYPE,
269    CTI_INT_FAST64_TYPE,
270    CTI_UINT_FAST8_TYPE,
271    CTI_UINT_FAST16_TYPE,
272    CTI_UINT_FAST32_TYPE,
273    CTI_UINT_FAST64_TYPE,
274    CTI_INTPTR_TYPE,
275    CTI_UINTPTR_TYPE,
276
277    CTI_CHAR_ARRAY_TYPE,
278    CTI_CHAR16_ARRAY_TYPE,
279    CTI_CHAR32_ARRAY_TYPE,
280    CTI_WCHAR_ARRAY_TYPE,
281    CTI_INT_ARRAY_TYPE,
282    CTI_STRING_TYPE,
283    CTI_CONST_STRING_TYPE,
284
285    /* Type for boolean expressions (bool in C++, int in C).  */
286    CTI_TRUTHVALUE_TYPE,
287    CTI_TRUTHVALUE_TRUE,
288    CTI_TRUTHVALUE_FALSE,
289
290    CTI_DEFAULT_FUNCTION_TYPE,
291
292    /* These are not types, but we have to look them up all the time.  */
293    CTI_FUNCTION_NAME_DECL,
294    CTI_PRETTY_FUNCTION_NAME_DECL,
295    CTI_C99_FUNCTION_NAME_DECL,
296    CTI_SAVED_FUNCTION_NAME_DECLS,
297
298    CTI_VOID_ZERO,
299
300    CTI_NULL,
301
302    CTI_MAX
303};
304
305#define C_CPP_HASHNODE(id) \
306  (&(((struct c_common_identifier *) (id))->node))
307#define C_RID_CODE(id) \
308  ((enum rid) (((struct c_common_identifier *) (id))->node.rid_code))
309#define C_SET_RID_CODE(id, code) \
310  (((struct c_common_identifier *) (id))->node.rid_code = (unsigned char) code)
311
312/* Identifier part common to the C front ends.  Inherits from
313   tree_identifier, despite appearances.  */
314struct GTY(()) c_common_identifier {
315  struct tree_common common;
316  struct cpp_hashnode node;
317};
318
319/* An entry in the reserved keyword table.  */
320
321struct c_common_resword
322{
323  const char *const word;
324  ENUM_BITFIELD(rid) const rid : 16;
325  const unsigned int disable   : 16;
326};
327
328/* Extra cpp_ttype values for C++.  */
329
330/* A token type for keywords, as opposed to ordinary identifiers.  */
331#define CPP_KEYWORD ((enum cpp_ttype) (N_TTYPES + 1))
332
333/* A token type for template-ids.  If a template-id is processed while
334   parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token;
335   the value of the CPP_TEMPLATE_ID is whatever was returned by
336   cp_parser_template_id.  */
337#define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1))
338
339/* A token type for nested-name-specifiers.  If a
340   nested-name-specifier is processed while parsing tentatively, it is
341   replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the
342   CPP_NESTED_NAME_SPECIFIER is whatever was returned by
343   cp_parser_nested_name_specifier_opt.  */
344#define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1))
345
346/* A token type for pre-parsed C++0x decltype.  */
347#define CPP_DECLTYPE ((enum cpp_ttype) (CPP_NESTED_NAME_SPECIFIER + 1))
348
349/* The number of token types, including C++-specific ones.  */
350#define N_CP_TTYPES ((int) (CPP_DECLTYPE + 1))
351
352/* Disable mask.  Keywords are disabled if (reswords[i].disable &
353   mask) is _true_.  Thus for keywords which are present in all
354   languages the disable field is zero.  */
355
356#define D_CONLY         0x001   /* C only (not in C++).  */
357#define D_CXXONLY       0x002   /* C++ only (not in C).  */
358#define D_C99           0x004   /* In C, C99 only.  */
359#define D_CXX0X         0x008   /* In C++, C++0X only.  */
360#define D_EXT           0x010   /* GCC extension.  */
361#define D_EXT89         0x020   /* GCC extension incorporated in C99.  */
362#define D_ASM           0x040   /* Disabled by -fno-asm.  */
363#define D_OBJC          0x080   /* In Objective C and neither C nor C++.  */
364#define D_CXX_OBJC      0x100   /* In Objective C, and C++, but not C.  */
365#define D_CXXWARN       0x200   /* In C warn with -Wcxx-compat.  */
366
367/* The reserved keyword table.  */
368extern const struct c_common_resword c_common_reswords[];
369
370/* The number of items in the reserved keyword table.  */
371extern const unsigned int num_c_common_reswords;
372
373#define char16_type_node                c_global_trees[CTI_CHAR16_TYPE]
374#define char32_type_node                c_global_trees[CTI_CHAR32_TYPE]
375#define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
376#define underlying_wchar_type_node      c_global_trees[CTI_UNDERLYING_WCHAR_TYPE]
377#define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
378#define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
379#define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
380#define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
381#define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
382#define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
383#define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
384
385#define sig_atomic_type_node            c_global_trees[CTI_SIG_ATOMIC_TYPE]
386#define int8_type_node                  c_global_trees[CTI_INT8_TYPE]
387#define int16_type_node                 c_global_trees[CTI_INT16_TYPE]
388#define int32_type_node                 c_global_trees[CTI_INT32_TYPE]
389#define int64_type_node                 c_global_trees[CTI_INT64_TYPE]
390#define uint8_type_node                 c_global_trees[CTI_UINT8_TYPE]
391#define c_uint16_type_node              c_global_trees[CTI_UINT16_TYPE]
392#define c_uint32_type_node              c_global_trees[CTI_UINT32_TYPE]
393#define c_uint64_type_node              c_global_trees[CTI_UINT64_TYPE]
394#define int_least8_type_node            c_global_trees[CTI_INT_LEAST8_TYPE]
395#define int_least16_type_node           c_global_trees[CTI_INT_LEAST16_TYPE]
396#define int_least32_type_node           c_global_trees[CTI_INT_LEAST32_TYPE]
397#define int_least64_type_node           c_global_trees[CTI_INT_LEAST64_TYPE]
398#define uint_least8_type_node           c_global_trees[CTI_UINT_LEAST8_TYPE]
399#define uint_least16_type_node          c_global_trees[CTI_UINT_LEAST16_TYPE]
400#define uint_least32_type_node          c_global_trees[CTI_UINT_LEAST32_TYPE]
401#define uint_least64_type_node          c_global_trees[CTI_UINT_LEAST64_TYPE]
402#define int_fast8_type_node             c_global_trees[CTI_INT_FAST8_TYPE]
403#define int_fast16_type_node            c_global_trees[CTI_INT_FAST16_TYPE]
404#define int_fast32_type_node            c_global_trees[CTI_INT_FAST32_TYPE]
405#define int_fast64_type_node            c_global_trees[CTI_INT_FAST64_TYPE]
406#define uint_fast8_type_node            c_global_trees[CTI_UINT_FAST8_TYPE]
407#define uint_fast16_type_node           c_global_trees[CTI_UINT_FAST16_TYPE]
408#define uint_fast32_type_node           c_global_trees[CTI_UINT_FAST32_TYPE]
409#define uint_fast64_type_node           c_global_trees[CTI_UINT_FAST64_TYPE]
410#define intptr_type_node                c_global_trees[CTI_INTPTR_TYPE]
411#define uintptr_type_node               c_global_trees[CTI_UINTPTR_TYPE]
412
413#define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
414#define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
415#define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
416
417#define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
418#define char16_array_type_node          c_global_trees[CTI_CHAR16_ARRAY_TYPE]
419#define char32_array_type_node          c_global_trees[CTI_CHAR32_ARRAY_TYPE]
420#define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
421#define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
422#define string_type_node                c_global_trees[CTI_STRING_TYPE]
423#define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
424
425#define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
426
427#define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
428#define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
429#define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
430#define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
431
432/* A node for `((void) 0)'.  */
433#define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
434
435/* The node for C++ `__null'.  */
436#define null_node                       c_global_trees[CTI_NULL]
437
438extern GTY(()) tree c_global_trees[CTI_MAX];
439
440/* In a RECORD_TYPE, a sorted array of the fields of the type, not a
441   tree for size reasons.  */
442struct GTY((variable_size)) sorted_fields_type {
443  int len;
444  tree GTY((length ("%h.len"))) elts[1];
445};
446
447/* Mark which labels are explicitly declared.
448   These may be shadowed, and may be referenced from nested functions.  */
449#define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
450
451typedef enum c_language_kind
452{
453  clk_c         = 0,            /* C90, C94 or C99 */
454  clk_objc      = 1,            /* clk_c with ObjC features.  */
455  clk_cxx       = 2,            /* ANSI/ISO C++ */
456  clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
457}
458c_language_kind;
459
460/* To test for a specific language use c_language, defined by each
461   front end.  For "ObjC features" or "not C++" use the macros.  */
462extern c_language_kind c_language;
463
464#define c_dialect_cxx()         ((c_language & clk_cxx) != 0)
465#define c_dialect_objc()        ((c_language & clk_objc) != 0)
466
467/* The various name of operator that appears in error messages. */
468typedef enum ref_operator {
469  /* NULL */
470  RO_NULL,
471  /* array indexing */
472  RO_ARRAY_INDEXING,
473  /* unary * */
474  RO_UNARY_STAR,
475  /* -> */
476  RO_ARROW,
477  /* implicit conversion */
478  RO_IMPLICIT_CONVERSION,
479  /* ->* */
480  RO_ARROW_STAR
481} ref_operator;
482
483/* Information about a statement tree.  */
484
485struct GTY(()) stmt_tree_s {
486  /* A stack of statement lists being collected.  */
487  vec<tree, va_gc> *x_cur_stmt_list;
488
489  /* In C++, Nonzero if we should treat statements as full
490     expressions.  In particular, this variable is non-zero if at the
491     end of a statement we should destroy any temporaries created
492     during that statement.  Similarly, if, at the end of a block, we
493     should destroy any local variables in this block.  Normally, this
494     variable is nonzero, since those are the normal semantics of
495     C++.
496
497     This flag has no effect in C.  */
498  int stmts_are_full_exprs_p;
499};
500
501typedef struct stmt_tree_s *stmt_tree;
502
503/* Global state pertinent to the current function.  Some C dialects
504   extend this structure with additional fields.  */
505
506struct GTY(()) c_language_function {
507  /* While we are parsing the function, this contains information
508     about the statement-tree that we are building.  */
509  struct stmt_tree_s x_stmt_tree;
510
511  /* Vector of locally defined typedefs, for
512     -Wunused-local-typedefs.  */
513  vec<tree, va_gc> *local_typedefs;
514};
515
516#define stmt_list_stack (current_stmt_tree ()->x_cur_stmt_list)
517
518/* When building a statement-tree, this is the current statement list
519   being collected.  */
520#define cur_stmt_list   (stmt_list_stack->last ())
521
522#define building_stmt_list_p() (stmt_list_stack && !stmt_list_stack->is_empty())
523
524/* Language-specific hooks.  */
525
526/* If non-NULL, this function is called after a precompile header file
527   is loaded.  */
528extern void (*lang_post_pch_load) (void);
529
530extern void push_file_scope (void);
531extern void pop_file_scope (void);
532extern stmt_tree current_stmt_tree (void);
533extern tree push_stmt_list (void);
534extern tree pop_stmt_list (tree);
535extern tree add_stmt (tree);
536extern void push_cleanup (tree, tree, bool);
537extern tree pushdecl_top_level (tree);
538extern tree pushdecl (tree);
539extern tree build_modify_expr (location_t, tree, tree, enum tree_code,
540                               location_t, tree, tree);
541extern tree build_indirect_ref (location_t, tree, ref_operator);
542
543extern int field_decl_cmp (const void *, const void *);
544extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
545                                  void *);
546extern bool has_c_linkage (const_tree decl);
547
548/* Switches common to the C front ends.  */
549
550/* Nonzero means don't output line number information.  */
551
552extern char flag_no_line_commands;
553
554/* Nonzero causes -E output not to be done, but directives such as
555   #define that have side effects are still obeyed.  */
556
557extern char flag_no_output;
558
559/* Nonzero means dump macros in some fashion; contains the 'D', 'M',
560   'N' or 'U' of the command line switch.  */
561
562extern char flag_dump_macros;
563
564/* Nonzero means pass #include lines through to the output.  */
565
566extern char flag_dump_includes;
567
568/* Nonzero means process PCH files while preprocessing.  */
569
570extern bool flag_pch_preprocess;
571
572/* The file name to which we should write a precompiled header, or
573   NULL if no header will be written in this compile.  */
574
575extern const char *pch_file;
576
577/* Nonzero if an ISO standard was selected.  It rejects macros in the
578   user's namespace.  */
579
580extern int flag_iso;
581
582/* C/ObjC language option variables.  */
583
584
585/* Nonzero means allow type mismatches in conditional expressions;
586   just make their values `void'.  */
587
588extern int flag_cond_mismatch;
589
590/* Nonzero means enable C89 Amendment 1 features.  */
591
592extern int flag_isoc94;
593
594/* Nonzero means use the ISO C99 (or C11) dialect of C.  */
595
596extern int flag_isoc99;
597
598/* Nonzero means use the ISO C11 dialect of C.  */
599
600extern int flag_isoc11;
601
602/* Nonzero means that we have builtin functions, and main is an int.  */
603
604extern int flag_hosted;
605
606/* ObjC language option variables.  */
607
608
609/* Tells the compiler that this is a special run.  Do not perform any
610   compiling, instead we are to test some platform dependent features
611   and output a C header file with appropriate definitions.  */
612
613extern int print_struct_values;
614
615/* Tells the compiler what is the constant string class for ObjC.  */
616
617extern const char *constant_string_class_name;
618
619
620/* C++ language option variables.  */
621
622
623/* Nonzero means generate separate instantiation control files and
624   juggle them at link time.  */
625
626extern int flag_use_repository;
627
628/* The supported C++ dialects.  */
629
630enum cxx_dialect {
631  /* C++98 with TC1  */
632  cxx98,
633  cxx03 = cxx98,
634  /* C++11  */
635  cxx0x,
636  cxx11 = cxx0x,
637  /* C++1y (C++17?) */
638  cxx1y
639};
640
641/* The C++ dialect being used. C++98 is the default.  */
642extern enum cxx_dialect cxx_dialect;
643
644/* Maximum template instantiation depth.  This limit is rather
645   arbitrary, but it exists to limit the time it takes to notice
646   excessively recursive template instantiations.  */
647
648extern int max_tinst_depth;
649
650/* Nonzero means that we should not issue warnings about problems that
651   occur when the code is executed, because the code being processed
652   is not expected to be executed.  This is set during parsing.  This
653   is used for cases like sizeof() and "0 ? a : b".  This is a count,
654   not a bool, because unexecuted expressions can nest.  */
655
656extern int c_inhibit_evaluation_warnings;
657
658/* Whether lexing has been completed, so subsequent preprocessor
659   errors should use the compiler's input_location.  */
660
661extern bool done_lexing;
662
663/* C types are partitioned into three subsets: object, function, and
664   incomplete types.  */
665#define C_TYPE_OBJECT_P(type) \
666  (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
667
668#define C_TYPE_INCOMPLETE_P(type) \
669  (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
670
671#define C_TYPE_FUNCTION_P(type) \
672  (TREE_CODE (type) == FUNCTION_TYPE)
673
674/* For convenience we define a single macro to identify the class of
675   object or incomplete types.  */
676#define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
677  (!C_TYPE_FUNCTION_P (type))
678
679struct visibility_flags
680{
681  unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
682  unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
683};
684
685/* Global visibility options.  */
686extern struct visibility_flags visibility_options;
687
688/* Attribute table common to the C front ends.  */
689extern const struct attribute_spec c_common_attribute_table[];
690extern const struct attribute_spec c_common_format_attribute_table[];
691
692/* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
693   ID is the identifier to use, NAME is the string.
694   TYPE_DEP indicates whether it depends on type of the function or not
695   (i.e. __PRETTY_FUNCTION__).  */
696
697extern tree (*make_fname_decl) (location_t, tree, int);
698
699/* In c-decl.c and cp/tree.c.  FIXME.  */
700extern void c_register_addr_space (const char *str, addr_space_t as);
701
702/* In c-common.c.  */
703extern bool in_late_binary_op;
704extern const char *c_addr_space_name (addr_space_t as);
705extern tree identifier_global_value (tree);
706extern tree c_linkage_bindings (tree);
707extern void record_builtin_type (enum rid, const char *, tree);
708extern tree build_void_list_node (void);
709extern void start_fname_decls (void);
710extern void finish_fname_decls (void);
711extern const char *fname_as_string (int);
712extern tree fname_decl (location_t, unsigned, tree);
713
714extern int check_user_alignment (const_tree, bool);
715extern void check_function_arguments (const_tree, int, tree *);
716extern void check_function_arguments_recurse (void (*)
717                                              (void *, tree,
718                                               unsigned HOST_WIDE_INT),
719                                              void *, tree,
720                                              unsigned HOST_WIDE_INT);
721extern bool check_builtin_function_arguments (tree, int, tree *);
722extern void check_function_format (tree, int, tree *);
723extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
724extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
725extern bool attribute_takes_identifier_p (const_tree);
726extern bool c_common_handle_option (size_t, const char *, int, int, location_t,
727                                    const struct cl_option_handlers *);
728extern bool default_handle_c_option (size_t, const char *, int);
729extern tree c_common_type_for_mode (enum machine_mode, int);
730extern tree c_common_type_for_size (unsigned int, int);
731extern tree c_common_fixed_point_type_for_size (unsigned int, unsigned int,
732                                                int, int);
733extern tree c_common_unsigned_type (tree);
734extern tree c_common_signed_type (tree);
735extern tree c_common_signed_or_unsigned_type (int, tree);
736extern void c_common_init_ts (void);
737extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
738extern bool unsafe_conversion_p (tree, tree, bool);
739extern bool decl_with_nonnull_addr_p (const_tree);
740extern tree c_fully_fold (tree, bool, bool *);
741extern tree decl_constant_value_for_optimization (tree);
742extern tree c_wrap_maybe_const (tree, bool);
743extern tree c_save_expr (tree);
744extern tree c_common_truthvalue_conversion (location_t, tree);
745extern void c_apply_type_quals_to_decl (int, tree);
746extern tree c_sizeof_or_alignof_type (location_t, tree, bool, int);
747extern tree c_alignof_expr (location_t, tree);
748/* Print an error message for invalid operands to arith operation CODE.
749   NOP_EXPR is used as a special case (see truthvalue_conversion).  */
750extern void binary_op_error (location_t, enum tree_code, tree, tree);
751extern tree fix_string_type (tree);
752extern void constant_expression_warning (tree);
753extern void constant_expression_error (tree);
754extern bool strict_aliasing_warning (tree, tree, tree);
755extern void sizeof_pointer_memaccess_warning (location_t *, tree,
756                                              vec<tree, va_gc> *, tree *,
757                                              bool (*) (tree, tree));
758extern void warnings_for_convert_and_check (tree, tree, tree);
759extern tree convert_and_check (tree, tree);
760extern void overflow_warning (location_t, tree);
761extern bool warn_if_unused_value (const_tree, location_t);
762extern void warn_logical_operator (location_t, enum tree_code, tree,
763                                   enum tree_code, tree, enum tree_code, tree);
764extern void check_main_parameter_types (tree decl);
765extern bool c_determine_visibility (tree);
766extern bool same_scalar_type_ignoring_signedness (tree, tree);
767extern void mark_valid_location_for_stdc_pragma (bool);
768extern bool valid_location_for_stdc_pragma_p (void);
769extern void set_float_const_decimal64 (void);
770extern void clear_float_const_decimal64 (void);
771extern bool float_const_decimal64_p (void);
772
773extern bool keyword_begins_type_specifier (enum rid);
774extern bool keyword_is_storage_class_specifier (enum rid);
775extern bool keyword_is_type_qualifier (enum rid);
776extern bool keyword_is_decl_specifier (enum rid);
777extern bool cxx_fundamental_alignment_p (unsigned);
778
779#define c_sizeof(LOC, T)  c_sizeof_or_alignof_type (LOC, T, true, 1)
780#define c_alignof(LOC, T) c_sizeof_or_alignof_type (LOC, T, false, 1)
781
782/* Subroutine of build_binary_op, used for certain operations.  */
783extern tree shorten_binary_op (tree result_type, tree op0, tree op1, bool bitwise);
784
785/* Subroutine of build_binary_op, used for comparison operations.
786   See if the operands have both been converted from subword integer types
787   and, if so, perhaps change them both back to their original type.  */
788extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
789
790extern tree pointer_int_sum (location_t, enum tree_code, tree, tree);
791
792/* Add qualifiers to a type, in the fashion for C.  */
793extern tree c_build_qualified_type (tree, int);
794
795/* Build tree nodes and builtin functions common to both C and C++ language
796   frontends.  */
797extern void c_common_nodes_and_builtins (void);
798
799extern void disable_builtin_function (const char *);
800
801extern void set_compound_literal_name (tree decl);
802
803extern tree build_va_arg (location_t, tree, tree);
804
805extern const unsigned int c_family_lang_mask;
806extern unsigned int c_common_option_lang_mask (void);
807extern void c_common_initialize_diagnostics (diagnostic_context *);
808extern bool c_common_complain_wrong_lang_p (const struct cl_option *);
809extern void c_common_init_options_struct (struct gcc_options *);
810extern void c_common_init_options (unsigned int, struct cl_decoded_option *);
811extern bool c_common_post_options (const char **);
812extern bool c_common_init (void);
813extern void c_common_finish (void);
814extern void c_common_parse_file (void);
815extern alias_set_type c_common_get_alias_set (tree);
816extern void c_register_builtin_type (tree, const char*);
817extern bool c_promoting_integer_type_p (const_tree);
818extern int self_promoting_args_p (const_tree);
819extern tree strip_pointer_operator (tree);
820extern tree strip_pointer_or_array_types (tree);
821extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
822
823/* This is the basic parsing function.  */
824extern void c_parse_file (void);
825
826extern void warn_for_omitted_condop (location_t, tree);
827
828/* These macros provide convenient access to the various _STMT nodes.  */
829
830/* Nonzero if a given STATEMENT_LIST represents the outermost binding
831   if a statement expression.  */
832#define STATEMENT_LIST_STMT_EXPR(NODE) \
833  TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
834
835/* Nonzero if a label has been added to the statement list.  */
836#define STATEMENT_LIST_HAS_LABEL(NODE) \
837  TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
838
839/* C_MAYBE_CONST_EXPR accessors.  */
840#define C_MAYBE_CONST_EXPR_PRE(NODE)                    \
841  TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 0)
842#define C_MAYBE_CONST_EXPR_EXPR(NODE)                   \
843  TREE_OPERAND (C_MAYBE_CONST_EXPR_CHECK (NODE), 1)
844#define C_MAYBE_CONST_EXPR_INT_OPERANDS(NODE)           \
845  TREE_LANG_FLAG_0 (C_MAYBE_CONST_EXPR_CHECK (NODE))
846#define C_MAYBE_CONST_EXPR_NON_CONST(NODE)              \
847  TREE_LANG_FLAG_1 (C_MAYBE_CONST_EXPR_CHECK (NODE))
848#define EXPR_INT_CONST_OPERANDS(EXPR)                   \
849  (INTEGRAL_TYPE_P (TREE_TYPE (EXPR))                   \
850   && (TREE_CODE (EXPR) == INTEGER_CST                  \
851       || (TREE_CODE (EXPR) == C_MAYBE_CONST_EXPR       \
852           && C_MAYBE_CONST_EXPR_INT_OPERANDS (EXPR))))
853
854/* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
855#define DECL_C_BIT_FIELD(NODE) \
856  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
857#define SET_DECL_C_BIT_FIELD(NODE) \
858  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
859#define CLEAR_DECL_C_BIT_FIELD(NODE) \
860  (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
861
862extern tree do_case (location_t, tree, tree);
863extern tree build_stmt (location_t, enum tree_code, ...);
864extern tree build_real_imag_expr (location_t, enum tree_code, tree);
865
866/* These functions must be defined by each front-end which implements
867   a variant of the C language.  They are used in c-common.c.  */
868
869extern tree build_unary_op (location_t, enum tree_code, tree, int);
870extern tree build_binary_op (location_t, enum tree_code, tree, tree, int);
871extern tree perform_integral_promotions (tree);
872
873/* These functions must be defined by each front-end which implements
874   a variant of the C language.  They are used by port files.  */
875
876extern tree default_conversion (tree);
877
878/* Given two integer or real types, return the type for their sum.
879   Given two compatible ANSI C types, returns the merged type.  */
880
881extern tree common_type (tree, tree);
882
883extern tree decl_constant_value (tree);
884
885/* Handle increment and decrement of boolean types.  */
886extern tree boolean_increment (enum tree_code, tree);
887
888extern int case_compare (splay_tree_key, splay_tree_key);
889
890extern tree c_add_case_label (location_t, splay_tree, tree, tree, tree, tree);
891
892extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
893
894extern tree build_function_call (location_t, tree, tree);
895
896extern tree build_function_call_vec (location_t, tree, vec<tree, va_gc> *,
897                                     vec<tree, va_gc> *);
898
899extern tree resolve_overloaded_builtin (location_t, tree, vec<tree, va_gc> *);
900
901extern tree finish_label_address_expr (tree, location_t);
902
903/* Same function prototype, but the C and C++ front ends have
904   different implementations.  Used in c-common.c.  */
905extern tree lookup_label (tree);
906extern tree lookup_name (tree);
907extern bool lvalue_p (const_tree);
908
909extern bool vector_targets_convertible_p (const_tree t1, const_tree t2);
910extern bool vector_types_convertible_p (const_tree t1, const_tree t2, bool emit_lax_note);
911extern tree c_build_vec_perm_expr (location_t, tree, tree, tree);
912
913extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
914
915extern void init_c_lex (void);
916
917extern void c_cpp_builtins (cpp_reader *);
918extern void c_cpp_builtins_optimize_pragma (cpp_reader *, tree, tree);
919extern bool c_cpp_error (cpp_reader *, int, int, location_t, unsigned int,
920                         const char *, va_list *)
921     ATTRIBUTE_GCC_DIAG(6,0);
922
923extern bool parse_optimize_options (tree, bool);
924
925/* Positive if an implicit `extern "C"' scope has just been entered;
926   negative if such a scope has just been exited.  */
927extern GTY(()) int pending_lang_change;
928
929/* Information recorded about each file examined during compilation.  */
930
931struct c_fileinfo
932{
933  int time;     /* Time spent in the file.  */
934
935  /* Flags used only by C++.
936     INTERFACE_ONLY nonzero means that we are in an "interface" section
937     of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
938     the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
939     INTERFACE_ONLY is zero, it means that we are responsible for
940     exporting definitions that others might need.  */
941  short interface_only;
942  short interface_unknown;
943};
944
945struct c_fileinfo *get_fileinfo (const char *);
946extern void dump_time_statistics (void);
947
948extern bool c_dump_tree (void *, tree);
949
950extern void verify_sequence_points (tree);
951
952extern tree fold_offsetof_1 (tree);
953extern tree fold_offsetof (tree);
954
955/* Places where an lvalue, or modifiable lvalue, may be required.
956   Used to select diagnostic messages in lvalue_error and
957   readonly_error.  */
958enum lvalue_use {
959  lv_assign,
960  lv_increment,
961  lv_decrement,
962  lv_addressof,
963  lv_asm
964};
965
966extern void readonly_error (tree, enum lvalue_use);
967extern void lvalue_error (location_t, enum lvalue_use);
968extern void invalid_indirection_error (location_t, tree, ref_operator);
969
970extern int complete_array_type (tree *, tree, bool);
971
972extern tree builtin_type_for_size (int, bool);
973
974extern void c_common_mark_addressable_vec (tree);
975
976extern void warn_array_subscript_with_type_char (tree);
977extern void warn_about_parentheses (location_t,
978                                    enum tree_code,
979                                    enum tree_code, tree,
980                                    enum tree_code, tree);
981extern void warn_for_unused_label (tree label);
982extern void warn_for_div_by_zero (location_t, tree divisor);
983extern void warn_for_sign_compare (location_t,
984                                   tree orig_op0, tree orig_op1,
985                                   tree op0, tree op1,
986                                   tree result_type,
987                                   enum tree_code resultcode);
988extern void do_warn_double_promotion (tree, tree, tree, const char *, 
989                                      location_t);
990extern void set_underlying_type (tree);
991extern void record_locally_defined_typedef (tree);
992extern void maybe_record_typedef_use (tree);
993extern void maybe_warn_unused_local_typedefs (void);
994extern vec<tree, va_gc> *make_tree_vector (void);
995extern void release_tree_vector (vec<tree, va_gc> *);
996extern vec<tree, va_gc> *make_tree_vector_single (tree);
997extern vec<tree, va_gc> *make_tree_vector_from_list (tree);
998extern vec<tree, va_gc> *make_tree_vector_copy (const vec<tree, va_gc> *);
999
1000/* In c-gimplify.c  */
1001extern void c_genericize (tree);
1002extern int c_gimplify_expr (tree *, gimple_seq *, gimple_seq *);
1003extern tree c_build_bind_expr (location_t, tree, tree);
1004
1005/* In c-pch.c  */
1006extern void pch_init (void);
1007extern void pch_cpp_save_state (void);
1008extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1009extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1010                               const char *orig);
1011extern void c_common_write_pch (void);
1012extern void c_common_no_more_pch (void);
1013extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
1014
1015/* In *-checksum.c */
1016extern const unsigned char executable_checksum[16];
1017
1018/* In c-cppbuiltin.c  */
1019extern void builtin_define_std (const char *macro);
1020extern void builtin_define_with_value (const char *, const char *, int);
1021extern void c_stddef_cpp_builtins (void);
1022extern void fe_file_change (const struct line_map *);
1023extern void c_parse_error (const char *, enum cpp_ttype, tree, unsigned char);
1024
1025/* In c-ppoutput.c  */
1026extern void init_pp_output (FILE *);
1027extern void preprocess_file (cpp_reader *);
1028extern void pp_file_change (const struct line_map *);
1029extern void pp_dir_change (cpp_reader *, const char *);
1030extern bool check_missing_format_attribute (tree, tree);
1031
1032/* In c-omp.c  */
1033extern tree c_finish_omp_master (location_t, tree);
1034extern tree c_finish_omp_critical (location_t, tree, tree);
1035extern tree c_finish_omp_ordered (location_t, tree);
1036extern void c_finish_omp_barrier (location_t);
1037extern tree c_finish_omp_atomic (location_t, enum tree_code, enum tree_code,
1038                                 tree, tree, tree, tree, tree);
1039extern void c_finish_omp_flush (location_t);
1040extern void c_finish_omp_taskwait (location_t);
1041extern void c_finish_omp_taskyield (location_t);
1042extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
1043extern void c_split_parallel_clauses (location_t, tree, tree *, tree *);
1044extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
1045
1046/* Not in c-omp.c; provided by the front end.  */
1047extern bool c_omp_sharing_predetermined (tree);
1048extern tree c_omp_remap_decl (tree, bool);
1049extern void record_types_used_by_current_var_decl (tree);
1050
1051/* Return next tree in the chain for chain_next walking of tree nodes.  */
1052static inline tree
1053c_tree_chain_next (tree t)
1054{
1055  /* TREE_CHAIN of a type is TYPE_STUB_DECL, which is different
1056     kind of object, never a long chain of nodes.  Prefer
1057     TYPE_NEXT_VARIANT for types.  */
1058  if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPE_COMMON))
1059    return TYPE_NEXT_VARIANT (t);
1060  /* Otherwise, if there is TREE_CHAIN, return it.  */
1061  if (CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_COMMON))
1062    return TREE_CHAIN (t);
1063  return NULL;
1064}
1065
1066/* Mask used by tm_stmt_attr.  */
1067#define TM_STMT_ATTR_OUTER      2
1068#define TM_STMT_ATTR_ATOMIC     4
1069#define TM_STMT_ATTR_RELAXED    8
1070
1071extern int parse_tm_stmt_attr (tree, int);
1072
1073/* Mask used by tm_attr_to_mask and tm_mask_to_attr.  Note that these
1074   are ordered specifically such that more restrictive attributes are
1075   at lower bit positions.  This fact is known by the C++ tm attribute
1076   inheritance code such that least bit extraction (mask & -mask) results
1077   in the most restrictive attribute.  */
1078#define TM_ATTR_SAFE                    1
1079#define TM_ATTR_CALLABLE                2
1080#define TM_ATTR_PURE                    4
1081#define TM_ATTR_IRREVOCABLE             8
1082#define TM_ATTR_MAY_CANCEL_OUTER        16
1083
1084extern int tm_attr_to_mask (tree);
1085extern tree tm_mask_to_attr (int);
1086extern tree find_tm_attribute (tree);
1087
1088/* A suffix-identifier value doublet that represents user-defined literals
1089   for C++-0x.  */
1090enum overflow_type {
1091  OT_UNDERFLOW = -1,
1092  OT_NONE,
1093  OT_OVERFLOW
1094};
1095
1096struct GTY(()) tree_userdef_literal {
1097  struct tree_base base;
1098  tree suffix_id;
1099  tree value;
1100  tree num_string;
1101  enum overflow_type overflow;
1102};
1103
1104#define USERDEF_LITERAL_SUFFIX_ID(NODE) \
1105  (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->suffix_id)
1106
1107#define USERDEF_LITERAL_VALUE(NODE) \
1108  (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->value)
1109
1110#define USERDEF_LITERAL_OVERFLOW(NODE) \
1111  (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->overflow)
1112
1113#define USERDEF_LITERAL_NUM_STRING(NODE) \
1114  (((struct tree_userdef_literal *)USERDEF_LITERAL_CHECK (NODE))->num_string)
1115
1116#define USERDEF_LITERAL_TYPE(NODE) \
1117  (TREE_TYPE (USERDEF_LITERAL_VALUE (NODE)))
1118
1119extern tree build_userdef_literal (tree suffix_id, tree value,
1120                                   enum overflow_type overflow,
1121                                   tree num_string);
1122
1123extern void convert_vector_to_pointer_for_subscript (location_t, tree*, tree);
1124
1125/* Possibe cases of scalar_to_vector conversion.  */
1126enum stv_conv {
1127  stv_error,        /* Error occured.  */
1128  stv_nothing,      /* Nothing happened.  */
1129  stv_firstarg,     /* First argument must be expanded.  */
1130  stv_secondarg     /* Second argument must be expanded.  */
1131};
1132
1133extern enum stv_conv scalar_to_vector (location_t loc, enum tree_code code,
1134                                       tree op0, tree op1, bool);
1135
1136#endif /* ! GCC_C_COMMON_H */
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