gcc/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_C_COMMON_H
  23 #define GCC_C_COMMON_H
  24
  25 #include "splay-tree.h"
  26 #include "cpplib.h"
  27
  28 /* Usage of TREE_LANG_FLAG_?:
  29    0: COMPOUND_STMT_NO_SCOPE (in COMPOUND_STMT).
  30       TREE_NEGATED_INT (in INTEGER_CST).
  31       IDENTIFIER_MARKED (used by search routines).
  32       SCOPE_BEGIN_P (in SCOPE_STMT)
  33       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  34       NEW_FOR_SCOPE_P (in FOR_STMT)
  35       ASM_INPUT_P (in ASM_STMT)
  36       STMT_EXPR_NO_SCOPE (in STMT_EXPR)
  37    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  38       STMT_IS_FULL_EXPR_P (in _STMT)
  39    2: STMT_LINENO_FOR_FN_P (in _STMT)
  40    3: SCOPE_NO_CLEANUPS_P (in SCOPE_STMT)
  41       COMPOUND_STMT_BODY_BLOCK (in COMPOUND_STMT)
  42    4: SCOPE_PARTIAL_P (in SCOPE_STMT)
  43 */
  44
  45 /* Reserved identifiers.  This is the union of all the keywords for C,
  46    C++, and Objective-C.  All the type modifiers have to be in one
  47    block at the beginning, because they are used as mask bits.  There
  48    are 27 type modifiers; if we add many more we will have to redesign
  49    the mask mechanism.  */
  50
  51 enum rid
  52 {
  53   /* Modifiers: */
  54   /* C, in empirical order of frequency.  */
  55   RID_STATIC = 0,
  56   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  57   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  58   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  59
  60   /* C extensions */
  61   RID_BOUNDED, RID_UNBOUNDED, RID_COMPLEX, RID_THREAD,
  62
  63   /* C++ */
  64   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  65
  66   /* ObjC */
  67   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  68
  69   /* C */
  70   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  71   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  72   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  73   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  74   RID_SIZEOF,
  75
  76   /* C extensions */
  77   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  78   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_PTRBASE,
  79   RID_PTREXTENT, RID_PTRVALUE, RID_CHOOSE_EXPR, RID_TYPES_COMPATIBLE_P,
  80
  81   /* Too many ways of getting the name of a function as a string */
  82   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  83
  84   /* C++ */
  85   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  86   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  87   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  88   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  89   RID_NEW,      RID_OPERATOR, RID_THIS,
  90   RID_THROW,    RID_TRUE,     RID_TRY,
  91   RID_TYPENAME, RID_TYPEID,   RID_USING,
  92
  93   /* casts */
  94   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  95
  96   /* Objective-C */
  97   RID_ID,          RID_AT_ENCODE,    RID_AT_END,
  98   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
  99   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 100   RID_AT_PROTOCOL, RID_AT_SELECTOR,  RID_AT_INTERFACE,
 101   RID_AT_IMPLEMENTATION,
 102
 103   RID_MAX,
 104
 105   RID_FIRST_MODIFIER = RID_STATIC,
 106   RID_LAST_MODIFIER = RID_ONEWAY,
 107
 108   RID_FIRST_AT = RID_AT_ENCODE,
 109   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 110   RID_FIRST_PQ = RID_IN,
 111   RID_LAST_PQ = RID_ONEWAY
 112 };
 113
 114 #define OBJC_IS_AT_KEYWORD(rid) \
 115   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 116    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 117
 118 #define OBJC_IS_PQ_KEYWORD(rid) \
 119   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 120    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 121
 122 /* The elements of `ridpointers' are identifier nodes for the reserved
 123    type names and storage classes.  It is indexed by a RID_... value.  */
 124 extern GTY ((length ("(int)RID_MAX"))) tree *ridpointers;
 125
 126 /* Standard named or nameless data types of the C compiler.  */
 127
 128 enum c_tree_index
 129 {
 130     CTI_WCHAR_TYPE,
 131     CTI_SIGNED_WCHAR_TYPE,
 132     CTI_UNSIGNED_WCHAR_TYPE,
 133     CTI_WINT_TYPE,
 134     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 135     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 136     CTI_INTMAX_TYPE,
 137     CTI_UINTMAX_TYPE,
 138     CTI_WIDEST_INT_LIT_TYPE,
 139     CTI_WIDEST_UINT_LIT_TYPE,
 140
 141     CTI_CHAR_ARRAY_TYPE,
 142     CTI_WCHAR_ARRAY_TYPE,
 143     CTI_INT_ARRAY_TYPE,
 144     CTI_STRING_TYPE,
 145     CTI_CONST_STRING_TYPE,
 146
 147     /* Type for boolean expressions (bool in C++, int in C).  */
 148     CTI_BOOLEAN_TYPE,
 149     CTI_BOOLEAN_TRUE,
 150     CTI_BOOLEAN_FALSE,
 151     /* C99's _Bool type.  */
 152     CTI_C_BOOL_TYPE,
 153     CTI_C_BOOL_TRUE,
 154     CTI_C_BOOL_FALSE,
 155     CTI_DEFAULT_FUNCTION_TYPE,
 156
 157     CTI_G77_INTEGER_TYPE,
 158     CTI_G77_UINTEGER_TYPE,
 159     CTI_G77_LONGINT_TYPE,
 160     CTI_G77_ULONGINT_TYPE,
 161
 162     /* These are not types, but we have to look them up all the time.  */
 163     CTI_FUNCTION_NAME_DECL,
 164     CTI_PRETTY_FUNCTION_NAME_DECL,
 165     CTI_C99_FUNCTION_NAME_DECL,
 166     CTI_SAVED_FUNCTION_NAME_DECLS,
 167
 168     CTI_VOID_ZERO,
 169
 170     CTI_MAX
 171 };
 172
 173 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 174
 175 /* Identifier part common to the C front ends.  Inherits from
 176    tree_identifier, despite appearances.  */
 177 struct c_common_identifier GTY(())
 178 {
 179   struct tree_common common;
 180   struct cpp_hashnode node;
 181 };
 182
 183 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 184 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 185 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 186 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 187 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 188 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 189 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 190 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 191 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 192 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 193
 194 #define boolean_type_node               c_global_trees[CTI_BOOLEAN_TYPE]
 195 #define boolean_true_node               c_global_trees[CTI_BOOLEAN_TRUE]
 196 #define boolean_false_node              c_global_trees[CTI_BOOLEAN_FALSE]
 197
 198 #define c_bool_type_node                c_global_trees[CTI_C_BOOL_TYPE]
 199 #define c_bool_true_node                c_global_trees[CTI_C_BOOL_TRUE]
 200 #define c_bool_false_node               c_global_trees[CTI_C_BOOL_FALSE]
 201
 202 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 203 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 204 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 205 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 206 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 207
 208 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 209
 210 /* g77 integer types, which which must be kept in sync with f/com.h */
 211 #define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
 212 #define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
 213 #define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
 214 #define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
 215
 216 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 217 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 218 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 219 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 220
 221 /* A node for `((void) 0)'.  */
 222 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 223
 224 extern GTY(()) tree c_global_trees[CTI_MAX];
 225
 226 /* Mark which labels are explicitly declared.
 227    These may be shadowed, and may be referenced from nested functions.  */
 228 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 229
 230 /* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
 231    warning if they undergo concatenation.  */
 232 #define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
 233
 234 typedef enum c_language_kind
 235 {
 236   clk_c = 0,      /* A dialect of C: K&R C, ANSI/ISO C89, C2000, etc.  */
 237   clk_cplusplus   /* ANSI/ISO C++ */
 238 }
 239 c_language_kind;
 240
 241 /* Information about a statement tree.  */
 242
 243 struct stmt_tree_s GTY(()) {
 244   /* The last statement added to the tree.  */
 245   tree x_last_stmt;
 246   /* The type of the last expression statement.  (This information is
 247      needed to implement the statement-expression extension.)  */
 248   tree x_last_expr_type;
 249   /* The last filename we recorded.  */
 250   const char *x_last_expr_filename;
 251   /* In C++, Nonzero if we should treat statements as full
 252      expressions.  In particular, this variable is no-zero if at the
 253      end of a statement we should destroy any temporaries created
 254      during that statement.  Similarly, if, at the end of a block, we
 255      should destroy any local variables in this block.  Normally, this
 256      variable is nonzero, since those are the normal semantics of
 257      C++.
 258
 259      However, in order to represent aggregate initialization code as
 260      tree structure, we use statement-expressions.  The statements
 261      within the statement expression should not result in cleanups
 262      being run until the entire enclosing statement is complete.
 263
 264      This flag has no effect in C.  */
 265   int stmts_are_full_exprs_p;
 266 };
 267
 268 typedef struct stmt_tree_s *stmt_tree;
 269
 270 /* Global state pertinent to the current function.  Some C dialects
 271    extend this structure with additional fields.  */
 272
 273 struct c_language_function GTY(()) {
 274   /* While we are parsing the function, this contains information
 275      about the statement-tree that we are building.  */
 276   struct stmt_tree_s x_stmt_tree;
 277   /* The stack of SCOPE_STMTs for the current function.  */
 278   tree x_scope_stmt_stack;
 279 };
 280
 281 /* When building a statement-tree, this is the last statement added to
 282    the tree.  */
 283
 284 #define last_tree (current_stmt_tree ()->x_last_stmt)
 285
 286 /* The type of the last expression-statement we have seen.  */
 287
 288 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 289
 290 /* The name of the last file we have seen.  */
 291
 292 #define last_expr_filename (current_stmt_tree ()->x_last_expr_filename)
 293
 294 /* LAST_TREE contains the last statement parsed.  These are chained
 295    together through the TREE_CHAIN field, but often need to be
 296    re-organized since the parse is performed bottom-up.  This macro
 297    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 298
 299 #define RECHAIN_STMTS(stmt, substmt)            \
 300   do {                                          \
 301     substmt = TREE_CHAIN (stmt);                \
 302     TREE_CHAIN (stmt) = NULL_TREE;              \
 303     last_tree = stmt;                           \
 304   } while (0)
 305
 306 /* Language-specific hooks.  */
 307
 308 extern void (*lang_expand_stmt)                 PARAMS ((tree));
 309 extern void (*lang_expand_decl_stmt)            PARAMS ((tree));
 310 extern void (*lang_expand_function_end)         PARAMS ((void));
 311 extern tree gettags                             PARAMS ((void));
 312
 313 /* Callback that determines if it's ok for a function to have no
 314    noreturn attribute.  */
 315 extern int (*lang_missing_noreturn_ok_p)        PARAMS ((tree));
 316
 317 extern int yyparse                              PARAMS ((void));
 318 extern void free_parser_stacks                  PARAMS ((void));
 319
 320 extern stmt_tree current_stmt_tree              PARAMS ((void));
 321 extern tree *current_scope_stmt_stack           PARAMS ((void));
 322 extern void begin_stmt_tree                     PARAMS ((tree *));
 323 extern tree add_stmt                            PARAMS ((tree));
 324 extern void add_decl_stmt                       PARAMS ((tree));
 325 extern tree add_scope_stmt                      PARAMS ((int, int));
 326 extern void finish_stmt_tree                    PARAMS ((tree *));
 327
 328 extern tree walk_stmt_tree                      PARAMS ((tree *,
 329                                                          walk_tree_fn,
 330                                                          void *));
 331 extern void prep_stmt                           PARAMS ((tree));
 332 extern void expand_stmt                         PARAMS ((tree));
 333 extern tree c_begin_if_stmt                     PARAMS ((void));
 334 extern tree c_begin_while_stmt                  PARAMS ((void));
 335 extern void c_finish_while_stmt_cond            PARAMS ((tree, tree));
 336
 337 enum sw_kind { SW_PARAM = 0, SW_LOCAL, SW_GLOBAL };
 338 extern void shadow_warning                      PARAMS ((enum sw_kind,
 339                                                          const char *, tree));
 340
 341 /* Extra information associated with a DECL.  Other C dialects extend
 342    this structure in various ways.  The C front-end only uses this
 343    structure for FUNCTION_DECLs; all other DECLs have a NULL
 344    DECL_LANG_SPECIFIC field.  */
 345
 346 struct c_lang_decl GTY(()) {
 347   unsigned declared_inline : 1;
 348 };
 349
 350 /* In a FUNCTION_DECL for which DECL_BUILT_IN does not hold, this is
 351      the approximate number of statements in this function.  There is
 352      no need for this number to be exact; it is only used in various
 353      heuristics regarding optimization.  */
 354 #define DECL_NUM_STMTS(NODE) \
 355   (FUNCTION_DECL_CHECK (NODE)->decl.u1.i)
 356
 357 /* The variant of the C language being processed.  Each C language
 358    front-end defines this variable.  */
 359
 360 extern c_language_kind c_language;
 361
 362 /* Nonzero if we can read a PCH file now.  */
 363
 364 extern int allow_pch;
 365 \f
 366 /* Switches common to the C front ends.  */
 367
 368 /* Nonzero if prepreprocessing only.  */
 369
 370 extern int flag_preprocess_only;
 371
 372 /* Nonzero means don't output line number information.  */
 373
 374 extern char flag_no_line_commands;
 375
 376 /* Nonzero causes -E output not to be done, but directives such as
 377    #define that have side effects are still obeyed.  */
 378
 379 extern char flag_no_output;
 380
 381 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 382    'N' of the command line switch.  */
 383
 384 extern char flag_dump_macros;
 385
 386 /* Nonzero means pass #include lines through to the output.  */
 387
 388 extern char flag_dump_includes;
 389
 390 /* The file name to which we should write a precompiled header, or
 391    NULL if no header will be written in this compile.  */
 392
 393 extern const char *pch_file;
 394
 395 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 396    user's namespace.  */
 397
 398 extern int flag_iso;
 399
 400 /* Nonzero whenever Objective-C functionality is being used.  */
 401 extern int flag_objc;
 402
 403 /* Nonzero if -undef was given.  It suppresses target built-in macros
 404    and assertions.  */
 405
 406 extern int flag_undef;
 407
 408 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 409
 410 extern int flag_no_builtin;
 411
 412 /* Nonzero means don't recognize the non-ANSI builtin functions.
 413    -ansi sets this.  */
 414
 415 extern int flag_no_nonansi_builtin;
 416
 417 /* Nonzero means give `double' the same size as `float'.  */
 418
 419 extern int flag_short_double;
 420
 421 /* Nonzero means give `wchar_t' the same size as `short'.  */
 422
 423 extern int flag_short_wchar;
 424
 425 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 426 extern int flag_ms_extensions;
 427
 428 /* Nonzero means don't recognize the keyword `asm'.  */
 429
 430 extern int flag_no_asm;
 431
 432 /* Nonzero means give string constants the type `const char *', as mandated
 433    by the standard.  */
 434
 435 extern int flag_const_strings;
 436
 437 /* Nonzero means `$' can be in an identifier.  */
 438
 439 extern int dollars_in_ident;
 440
 441 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 442
 443 extern int flag_signed_bitfields;
 444 extern int explicit_flag_signed_bitfields;
 445
 446 /* Nonzero means warn about pointer casts that can drop a type qualifier
 447    from the pointer target type.  */
 448
 449 extern int warn_cast_qual;
 450
 451 /* Warn about functions which might be candidates for format attributes.  */
 452
 453 extern int warn_missing_format_attribute;
 454
 455 /* Nonzero means warn about sizeof(function) or addition/subtraction
 456    of function pointers.  */
 457
 458 extern int warn_pointer_arith;
 459
 460 /* Nonzero means warn for any global function def
 461    without separate previous prototype decl.  */
 462
 463 extern int warn_missing_prototypes;
 464
 465 /* Warn if adding () is suggested.  */
 466
 467 extern int warn_parentheses;
 468
 469 /* Warn if initializer is not completely bracketed.  */
 470
 471 extern int warn_missing_braces;
 472
 473 /* Warn about comparison of signed and unsigned values.
 474    If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified.  */
 475
 476 extern int warn_sign_compare;
 477
 478 /* Nonzero means warn about usage of long long when `-pedantic'.  */
 479
 480 extern int warn_long_long;
 481
 482 /* Nonzero means warn about deprecated conversion from string constant to
 483    `char *'.  */
 484
 485 extern int warn_write_strings;
 486
 487 /* Nonzero means warn about multiple (redundant) decls for the same single
 488    variable or function.  */
 489
 490 extern int warn_redundant_decls;
 491
 492 /* Warn about testing equality of floating point numbers.  */
 493
 494 extern int warn_float_equal;
 495
 496 /* Warn about a subscript that has type char.  */
 497
 498 extern int warn_char_subscripts;
 499
 500 /* Warn if a type conversion is done that might have confusing results.  */
 501
 502 extern int warn_conversion;
 503
 504 /* Warn about #pragma directives that are not recognized.  */
 505
 506 extern int warn_unknown_pragmas; /* Tri state variable.  */
 507
 508 /* Warn about format/argument anomalies in calls to formatted I/O functions
 509    (*printf, *scanf, strftime, strfmon, etc.).  */
 510
 511 extern int warn_format;
 512
 513 /* Warn about Y2K problems with strftime formats.  */
 514
 515 extern int warn_format_y2k;
 516
 517 /* Warn about excess arguments to formats.  */
 518
 519 extern int warn_format_extra_args;
 520
 521 /* Warn about zero-length formats.  */
 522
 523 extern int warn_format_zero_length;
 524
 525 /* Warn about non-literal format arguments.  */
 526
 527 extern int warn_format_nonliteral;
 528
 529 /* Warn about possible security problems with calls to format functions.  */
 530
 531 extern int warn_format_security;
 532
 533
 534 /* C/ObjC language option variables.  */
 535
 536
 537 /* Nonzero means message about use of implicit function declarations;
 538  1 means warning; 2 means error.  */
 539
 540 extern int mesg_implicit_function_declaration;
 541
 542 /* Nonzero means allow type mismatches in conditional expressions;
 543    just make their values `void'.  */
 544
 545 extern int flag_cond_mismatch;
 546
 547 /* Nonzero means enable C89 Amendment 1 features.  */
 548
 549 extern int flag_isoc94;
 550
 551 /* Nonzero means use the ISO C99 dialect of C.  */
 552
 553 extern int flag_isoc99;
 554
 555 /* Nonzero means that we have builtin functions, and main is an int */
 556
 557 extern int flag_hosted;
 558
 559 /* Nonzero means add default format_arg attributes for functions not
 560    in ISO C.  */
 561
 562 extern int flag_noniso_default_format_attributes;
 563
 564 /* Nonzero means warn when casting a function call to a type that does
 565    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 566    when there is no previous declaration of sqrt or malloc.  */
 567
 568 extern int warn_bad_function_cast;
 569
 570 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 571
 572 extern int warn_traditional;
 573
 574 /* Nonzero means warn for non-prototype function decls
 575    or non-prototyped defs without previous prototype.  */
 576
 577 extern int warn_strict_prototypes;
 578
 579 /* Nonzero means warn for any global function def
 580    without separate previous decl.  */
 581
 582 extern int warn_missing_declarations;
 583
 584 /* Nonzero means warn about extern declarations of objects not at
 585    file-scope level and about *all* declarations of functions (whether
 586    extern or static) not at file-scope level.  Note that we exclude
 587    implicit function declarations.  To get warnings about those, use
 588    -Wimplicit.  */
 589
 590 extern int warn_nested_externs;
 591
 592 /* Warn if main is suspicious.  */
 593
 594 extern int warn_main;
 595
 596 /* Nonzero means warn about possible violations of sequence point rules.  */
 597
 598 extern int warn_sequence_point;
 599
 600 /* Nonzero means to warn about compile-time division by zero.  */
 601 extern int warn_div_by_zero;
 602
 603 /* Nonzero means warn about use of implicit int.  */
 604
 605 extern int warn_implicit_int;
 606
 607 /* Warn about NULL being passed to argument slots marked as requiring
 608    non-NULL.  */
 609
 610 extern int warn_nonnull;
 611
 612
 613 /* ObjC language option variables.  */
 614
 615
 616 /* Open and close the file for outputting class declarations, if
 617    requested (ObjC).  */
 618
 619 extern int flag_gen_declaration;
 620
 621 /* Generate code for GNU or NeXT runtime environment.  */
 622
 623 extern int flag_next_runtime;
 624
 625 /* Tells the compiler that this is a special run.  Do not perform any
 626    compiling, instead we are to test some platform dependent features
 627    and output a C header file with appropriate definitions.  */
 628
 629 extern int print_struct_values;
 630
 631 /* ???.  Undocumented.  */
 632
 633 extern const char *constant_string_class_name;
 634
 635 /* Warn if multiple methods are seen for the same selector, but with
 636    different argument types.  Performs the check on the whole selector
 637    table at the end of compilation.  */
 638
 639 extern int warn_selector;
 640
 641 /* Warn if a @selector() is found, and no method with that selector
 642    has been previously declared.  The check is done on each
 643    @selector() as soon as it is found - so it warns about forward
 644    declarations.  */
 645
 646 extern int warn_undeclared_selector;
 647
 648 /* Warn if methods required by a protocol are not implemented in the
 649    class adopting it.  When turned off, methods inherited to that
 650    class are also considered implemented.  */
 651
 652 extern int warn_protocol;
 653
 654
 655 /* C++ language option variables.  */
 656
 657
 658 /* Nonzero means don't recognize any extension keywords.  */
 659
 660 extern int flag_no_gnu_keywords;
 661
 662 /* Nonzero means do emit exported implementations of functions even if
 663    they can be inlined.  */
 664
 665 extern int flag_implement_inlines;
 666
 667 /* Nonzero means do emit exported implementations of templates, instead of
 668    multiple static copies in each file that needs a definition.  */
 669
 670 extern int flag_external_templates;
 671
 672 /* Nonzero means that the decision to emit or not emit the implementation of a
 673    template depends on where the template is instantiated, rather than where
 674    it is defined.  */
 675
 676 extern int flag_alt_external_templates;
 677
 678 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 679
 680 extern int flag_implicit_templates;
 681
 682 /* Nonzero means that implicit instantiations of inline templates will be
 683    emitted if needed, even if instantiations of non-inline templates
 684    aren't.  */
 685
 686 extern int flag_implicit_inline_templates;
 687
 688 /* Nonzero means generate separate instantiation control files and
 689    juggle them at link time.  */
 690
 691 extern int flag_use_repository;
 692
 693 /* Nonzero if we want to issue diagnostics that the standard says are not
 694    required.  */
 695
 696 extern int flag_optional_diags;
 697
 698 /* Nonzero means we should attempt to elide constructors when possible.  */
 699
 700 extern int flag_elide_constructors;
 701
 702 /* Nonzero means that member functions defined in class scope are
 703    inline by default.  */
 704
 705 extern int flag_default_inline;
 706
 707 /* Controls whether compiler generates 'type descriptor' that give
 708    run-time type information.  */
 709
 710 extern int flag_rtti;
 711
 712 /* Nonzero if we want to conserve space in the .o files.  We do this
 713    by putting uninitialized data and runtime initialized data into
 714    .common instead of .data at the expense of not flagging multiple
 715    definitions.  */
 716
 717 extern int flag_conserve_space;
 718
 719 /* Nonzero if we want to obey access control semantics.  */
 720
 721 extern int flag_access_control;
 722
 723 /* Nonzero if we want to check the return value of new and avoid calling
 724    constructors if it is a null pointer.  */
 725
 726 extern int flag_check_new;
 727
 728 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 729    initialization variables.
 730    0: Old rules, set by -fno-for-scope.
 731    2: New ISO rules, set by -ffor-scope.
 732    1: Try to implement new ISO rules, but with backup compatibility
 733    (and warnings).  This is the default, for now.  */
 734
 735 extern int flag_new_for_scope;
 736
 737 /* Nonzero if we want to emit defined symbols with common-like linkage as
 738    weak symbols where possible, in order to conform to C++ semantics.
 739    Otherwise, emit them as local symbols.  */
 740
 741 extern int flag_weak;
 742
 743 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 744    destructors for local statics and global objects.  */
 745
 746 extern int flag_use_cxa_atexit;
 747
 748 /* Nonzero means output .vtable_{entry,inherit} for use in doing vtable gc.  */
 749
 750 extern int flag_vtable_gc;
 751
 752 /* Nonzero means make the default pedwarns warnings instead of errors.
 753    The value of this flag is ignored if -pedantic is specified.  */
 754
 755 extern int flag_permissive;
 756
 757 /* Nonzero means to implement standard semantics for exception
 758    specifications, calling unexpected if an exception is thrown that
 759    doesn't match the specification.  Zero means to treat them as
 760    assertions and optimize accordingly, but not check them.  */
 761
 762 extern int flag_enforce_eh_specs;
 763
 764 /*  The version of the C++ ABI in use.  The following values are
 765     allowed:
 766
 767     0: The version of the ABI believed most conformant with the
 768        C++ ABI specification.  This ABI may change as bugs are
 769        discovered and fixed.  Therefore, 0 will not necessarily
 770        indicate the same ABI in different versions of G++.
 771
 772     1: The version of the ABI first used in G++ 3.2.
 773
 774     Additional positive integers will be assigned as new versions of
 775     the ABI become the default version of the ABI.  */
 776
 777 extern int flag_abi_version;
 778
 779 /* Nonzero means warn about things that will change when compiling
 780    with an ABI-compliant compiler.  */
 781
 782 extern int warn_abi;
 783
 784 /* Nonzero means warn about implicit declarations.  */
 785
 786 extern int warn_implicit;
 787
 788 /* Nonzero means warn when all ctors or dtors are private, and the class
 789    has no friends.  */
 790
 791 extern int warn_ctor_dtor_privacy;
 792
 793 /* Nonzero means warn in function declared in derived class has the
 794    same name as a virtual in the base class, but fails to match the
 795    type signature of any virtual function in the base class.  */
 796
 797 extern int warn_overloaded_virtual;
 798
 799 /* Nonzero means warn when declaring a class that has a non virtual
 800    destructor, when it really ought to have a virtual one.  */
 801
 802 extern int warn_nonvdtor;
 803
 804 /* Nonzero means warn when the compiler will reorder code.  */
 805
 806 extern int warn_reorder;
 807
 808 /* Nonzero means warn when synthesis behavior differs from Cfront's.  */
 809
 810 extern int warn_synth;
 811
 812 /* Nonzero means warn when we convert a pointer to member function
 813    into a pointer to (void or function).  */
 814
 815 extern int warn_pmf2ptr;
 816
 817 /* Nonzero means warn about violation of some Effective C++ style rules.  */
 818
 819 extern int warn_ecpp;
 820
 821 /* Nonzero means warn where overload resolution chooses a promotion from
 822    unsigned to signed over a conversion to an unsigned of the same size.  */
 823
 824 extern int warn_sign_promo;
 825
 826 /* Nonzero means warn when an old-style cast is used.  */
 827
 828 extern int warn_old_style_cast;
 829
 830 /* Nonzero means warn when non-templatized friend functions are
 831    declared within a template */
 832
 833 extern int warn_nontemplate_friend;
 834
 835 /* Nonzero means complain about deprecated features.  */
 836
 837 extern int warn_deprecated;
 838
 839 /* Maximum template instantiation depth.  This limit is rather
 840    arbitrary, but it exists to limit the time it takes to notice
 841    infinite template instantiations.  */
 842
 843 extern int max_tinst_depth;
 844
 845 /* Nonzero means the expression being parsed will never be evaluated.
 846    This is a count, since unevaluated expressions can nest.  */
 847
 848 extern int skip_evaluation;
 849
 850 /* C types are partitioned into three subsets: object, function, and
 851    incomplete types.  */
 852 #define C_TYPE_OBJECT_P(type) \
 853   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 854
 855 #define C_TYPE_INCOMPLETE_P(type) \
 856   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 857
 858 #define C_TYPE_FUNCTION_P(type) \
 859   (TREE_CODE (type) == FUNCTION_TYPE)
 860
 861 /* For convenience we define a single macro to identify the class of
 862    object or incomplete types.  */
 863 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 864   (!C_TYPE_FUNCTION_P (type))
 865
 866 /* Record in each node resulting from a binary operator
 867    what operator was specified for it.  */
 868 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 869
 870 /* Attribute table common to the C front ends.  */
 871 extern const struct attribute_spec c_common_attribute_table[];
 872 extern const struct attribute_spec c_common_format_attribute_table[];
 873
 874 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 875    ID is the identifier to use, NAME is the string.
 876    TYPE_DEP indicates whether it depends on type of the function or not
 877    (i.e. __PRETTY_FUNCTION__).  */
 878
 879 extern tree (*make_fname_decl)                  PARAMS ((tree, int));
 880
 881 extern tree identifier_global_value             PARAMS ((tree));
 882 extern void record_builtin_type                 PARAMS ((enum rid,
 883                                                          const char *, tree));
 884 extern tree build_void_list_node                PARAMS ((void));
 885 extern void start_fname_decls                   PARAMS ((void));
 886 extern void finish_fname_decls                  PARAMS ((void));
 887 extern const char *fname_as_string              PARAMS ((int));
 888 extern tree fname_decl                          PARAMS ((unsigned, tree));
 889 extern const char *fname_string                 PARAMS ((unsigned));
 890
 891 extern void check_function_arguments            PARAMS ((tree, tree));
 892 extern void check_function_arguments_recurse    PARAMS ((void (*) (void *,
 893                                                                    tree,
 894                                                                    unsigned HOST_WIDE_INT),
 895                                                          void *, tree,
 896                                                          unsigned HOST_WIDE_INT));
 897 extern void check_function_format               PARAMS ((int *, tree, tree));
 898 extern void set_Wformat                         PARAMS ((int));
 899 extern tree handle_format_attribute             PARAMS ((tree *, tree, tree,
 900                                                          int, bool *));
 901 extern tree handle_format_arg_attribute         PARAMS ((tree *, tree, tree,
 902                                                          int, bool *));
 903 extern void c_common_insert_default_attributes  PARAMS ((tree));
 904 extern int c_common_decode_option               PARAMS ((int, char **));
 905 extern tree c_common_type_for_mode              PARAMS ((enum machine_mode,
 906                                                          int));
 907 extern tree c_common_type_for_size              PARAMS ((unsigned int, int));
 908 extern tree c_common_unsigned_type              PARAMS ((tree));
 909 extern tree c_common_signed_type                PARAMS ((tree));
 910 extern tree c_common_signed_or_unsigned_type    PARAMS ((int, tree));
 911 extern tree c_common_truthvalue_conversion      PARAMS ((tree));
 912 extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
 913 extern tree c_sizeof_or_alignof_type    PARAMS ((tree, enum tree_code, int));
 914 extern tree c_alignof_expr                      PARAMS ((tree));
 915 /* Print an error message for invalid operands to arith operation CODE.
 916    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 917 extern void binary_op_error                     PARAMS ((enum tree_code));
 918 #define my_friendly_assert(EXP, N) (void) \
 919  (((EXP) == 0) ? (fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0) : 0)
 920
 921 extern tree c_expand_expr_stmt                  PARAMS ((tree));
 922 extern void c_expand_start_cond                 PARAMS ((tree, int, tree));
 923 extern void c_finish_then                       PARAMS ((void));
 924 extern void c_expand_start_else                 PARAMS ((void));
 925 extern void c_finish_else                       PARAMS ((void));
 926 extern void c_expand_end_cond                   PARAMS ((void));
 927 /* Validate the expression after `case' and apply default promotions.  */
 928 extern tree check_case_value                    PARAMS ((tree));
 929 extern tree fix_string_type                     PARAMS ((tree));
 930 struct varray_head_tag;
 931 extern tree combine_strings             PARAMS ((struct varray_head_tag *));
 932 extern void constant_expression_warning         PARAMS ((tree));
 933 extern tree convert_and_check                   PARAMS ((tree, tree));
 934 extern void overflow_warning                    PARAMS ((tree));
 935 extern void unsigned_conversion_warning         PARAMS ((tree, tree));
 936
 937 /* Read the rest of the current #-directive line.  */
 938 extern char *get_directive_line                 PARAMS ((void));
 939 #define GET_DIRECTIVE_LINE() get_directive_line ()
 940 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 1)
 941 #define c_alignof(T) c_sizeof_or_alignof_type (T, ALIGNOF_EXPR, 1)
 942
 943 /* Subroutine of build_binary_op, used for comparison operations.
 944    See if the operands have both been converted from subword integer types
 945    and, if so, perhaps change them both back to their original type.  */
 946 extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
 947
 948 extern tree pointer_int_sum                     PARAMS ((enum tree_code, tree, tree));
 949 extern unsigned int min_precision               PARAMS ((tree, int));
 950
 951 /* Add qualifiers to a type, in the fashion for C.  */
 952 extern tree c_build_qualified_type              PARAMS ((tree, int));
 953
 954 /* Build tree nodes and builtin functions common to both C and C++ language
 955    frontends.  */
 956 extern void c_common_nodes_and_builtins         PARAMS ((void));
 957
 958 extern void disable_builtin_function            PARAMS ((const char *));
 959
 960 extern tree build_va_arg                        PARAMS ((tree, tree));
 961
 962 extern void c_common_init_options               PARAMS ((enum c_language_kind));
 963 extern bool c_common_post_options               PARAMS ((const char **));
 964 extern bool c_common_init                       PARAMS ((void));
 965 extern void c_common_finish                     PARAMS ((void));
 966 extern void c_common_parse_file                 PARAMS ((int));
 967 extern HOST_WIDE_INT c_common_get_alias_set     PARAMS ((tree));
 968 extern bool c_promoting_integer_type_p          PARAMS ((tree));
 969 extern int self_promoting_args_p                PARAMS ((tree));
 970 extern tree strip_array_types                   PARAMS ((tree));
 971
 972 /* These macros provide convenient access to the various _STMT nodes.  */
 973
 974 /* Nonzero if this statement should be considered a full-expression,
 975    i.e., if temporaries created during this statement should have
 976    their destructors run at the end of this statement.  (In C, this
 977    will always be false, since there are no destructors.)  */
 978 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 979
 980 /* IF_STMT accessors. These give access to the condition of the if
 981    statement, the then block of the if statement, and the else block
 982    of the if statement if it exists.  */
 983 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 984 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 985 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 986
 987 /* WHILE_STMT accessors. These give access to the condition of the
 988    while statement and the body of the while statement, respectively.  */
 989 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 990 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 991
 992 /* DO_STMT accessors. These give access to the condition of the do
 993    statement and the body of the do statement, respectively.  */
 994 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 995 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 996
 997 /* RETURN_STMT accessors. These give the expression associated with a
 998    return statement, and whether it should be ignored when expanding
 999    (as opposed to inlining).  */
1000 #define RETURN_STMT_EXPR(NODE)  TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
1001
1002 /* EXPR_STMT accessor. This gives the expression associated with an
1003    expression statement.  */
1004 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
1005
1006 /* FOR_STMT accessors. These give access to the init statement,
1007    condition, update expression, and body of the for statement,
1008    respectively.  */
1009 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
1010 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
1011 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
1012 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
1013
1014 /* SWITCH_STMT accessors. These give access to the condition, body and
1015    original condition type (before any compiler conversions)
1016    of the switch statement, respectively.  */
1017 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
1018 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
1019 #define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
1020
1021 /* CASE_LABEL accessors. These give access to the high and low values
1022    of a case label, respectively.  */
1023 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
1024 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
1025 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
1026
1027 /* GOTO_STMT accessor. This gives access to the label associated with
1028    a goto statement.  */
1029 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
1030 /* True for goto created artificially by the compiler.  */
1031 #define GOTO_FAKE_P(NODE)       (TREE_LANG_FLAG_0 (GOTO_STMT_CHECK (NODE)))
1032
1033 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
1034    statements associated with a compound statement. The result is the
1035    first statement in the list. Succeeding nodes can be accessed by
1036    calling TREE_CHAIN on a node in the list.  */
1037 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
1038
1039 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
1040    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
1041    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
1042    statement.  */
1043 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
1044 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
1045 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
1046 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
1047 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
1048
1049 /* DECL_STMT accessor. This gives access to the DECL associated with
1050    the given declaration statement.  */
1051 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
1052
1053 /* STMT_EXPR accessor.  */
1054 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
1055
1056 /* Nonzero if this statement-expression does not have an associated scope.  */
1057 #define STMT_EXPR_NO_SCOPE(NODE) \
1058    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
1059
1060 /* LABEL_STMT accessor. This gives access to the label associated with
1061    the given label statement.  */
1062 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
1063
1064 /* COMPOUND_LITERAL_EXPR accessors.  */
1065 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
1066   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
1067 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
1068   DECL_STMT_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
1069
1070 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
1071 #define SCOPE_BEGIN_P(NODE) \
1072   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
1073
1074 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
1075 #define SCOPE_END_P(NODE) \
1076   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
1077
1078 /* The BLOCK containing the declarations contained in this scope.  */
1079 #define SCOPE_STMT_BLOCK(NODE) \
1080   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
1081
1082 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
1083 #define SCOPE_NULLIFIED_P(NODE) \
1084   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
1085
1086 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
1087    which should be treated as non-existent from the point of view of
1088    running cleanup actions.  */
1089 #define SCOPE_NO_CLEANUPS_P(NODE) \
1090   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
1091
1092 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
1093    For example, in:
1094
1095      S s;
1096      l:
1097      S s2;
1098      goto l;
1099
1100    there is (implicitly) a new scope after `l', even though there are
1101    no curly braces.  In particular, when we hit the goto, we must
1102    destroy s2 and then re-construct it.  For the implicit scope,
1103    SCOPE_PARTIAL_P will be set.  */
1104 #define SCOPE_PARTIAL_P(NODE) \
1105   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
1106
1107 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
1108 #define ASM_VOLATILE_P(NODE)                    \
1109   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
1110
1111 /* The VAR_DECL to clean up in a CLEANUP_STMT.  */
1112 #define CLEANUP_DECL(NODE) \
1113   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
1114 /* The cleanup to run in a CLEANUP_STMT.  */
1115 #define CLEANUP_EXPR(NODE) \
1116   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
1117
1118 /* The filename we are changing to as of this FILE_STMT.  */
1119 #define FILE_STMT_FILENAME_NODE(NODE) \
1120   (TREE_OPERAND (FILE_STMT_CHECK (NODE), 0))
1121 #define FILE_STMT_FILENAME(NODE) \
1122   (IDENTIFIER_POINTER (FILE_STMT_FILENAME_NODE (NODE)))
1123
1124 /* The line-number at which a statement began.  But if
1125    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
1126    line number for the end of the current function instead.  */
1127 #define STMT_LINENO(NODE)                       \
1128   (TREE_COMPLEXITY ((NODE)))
1129
1130 /* If nonzero, the STMT_LINENO for NODE is the line at which the
1131    function ended.  */
1132 #define STMT_LINENO_FOR_FN_P(NODE)              \
1133   (TREE_LANG_FLAG_2 ((NODE)))
1134
1135 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
1136    initialization variables.  */
1137 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
1138
1139 /* Nonzero if we want to create an ASM_INPUT instead of an
1140    ASM_OPERAND with no operands.  */
1141 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
1142
1143 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
1144
1145 enum c_tree_code {
1146   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
1147 #include "c-common.def"
1148   LAST_C_TREE_CODE
1149 };
1150
1151 #undef DEFTREECODE
1152
1153 #define c_common_stmt_codes                             \
1154    CLEANUP_STMT,        EXPR_STMT,      COMPOUND_STMT,  \
1155    DECL_STMT,           IF_STMT,        FOR_STMT,       \
1156    WHILE_STMT,          DO_STMT,        RETURN_STMT,    \
1157    BREAK_STMT,          CONTINUE_STMT,  SCOPE_STMT,     \
1158    SWITCH_STMT,         GOTO_STMT,      LABEL_STMT,     \
1159    ASM_STMT,            FILE_STMT,      CASE_LABEL
1160
1161 /* TRUE if a code represents a statement.  The front end init
1162    langhook should take care of initialization of this array.  */
1163 extern bool statement_code_p[MAX_TREE_CODES];
1164
1165 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
1166
1167 #define INIT_STATEMENT_CODES(STMT_CODES)                        \
1168   do {                                                          \
1169     unsigned int i;                                             \
1170     memset (&statement_code_p, 0, sizeof (statement_code_p));   \
1171     for (i = 0; i < ARRAY_SIZE (STMT_CODES); i++)               \
1172       statement_code_p[STMT_CODES[i]] = true;                   \
1173   } while (0)
1174
1175 extern void genrtl_do_pushlevel                 PARAMS ((void));
1176 extern void genrtl_goto_stmt                    PARAMS ((tree));
1177 extern void genrtl_expr_stmt                    PARAMS ((tree));
1178 extern void genrtl_expr_stmt_value              PARAMS ((tree, int, int));
1179 extern void genrtl_decl_stmt                    PARAMS ((tree));
1180 extern void genrtl_if_stmt                      PARAMS ((tree));
1181 extern void genrtl_while_stmt                   PARAMS ((tree));
1182 extern void genrtl_do_stmt                      PARAMS ((tree));
1183 extern void genrtl_return_stmt                  PARAMS ((tree));
1184 extern void genrtl_for_stmt                     PARAMS ((tree));
1185 extern void genrtl_break_stmt                   PARAMS ((void));
1186 extern void genrtl_continue_stmt                PARAMS ((void));
1187 extern void genrtl_scope_stmt                   PARAMS ((tree));
1188 extern void genrtl_switch_stmt                  PARAMS ((tree));
1189 extern void genrtl_case_label                   PARAMS ((tree));
1190 extern void genrtl_compound_stmt                PARAMS ((tree));
1191 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
1192                                                          tree, tree,
1193                                                          tree, int));
1194 extern void genrtl_cleanup_stmt                 PARAMS ((tree));
1195 extern int stmts_are_full_exprs_p               PARAMS ((void));
1196 extern int anon_aggr_type_p                     PARAMS ((tree));
1197
1198 /* For a VAR_DECL that is an anonymous union, these are the various
1199    sub-variables that make up the anonymous union.  */
1200 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
1201
1202 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
1203 #define DECL_C_BIT_FIELD(NODE) \
1204   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
1205 #define SET_DECL_C_BIT_FIELD(NODE) \
1206   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
1207 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
1208   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
1209
1210 /* In a VAR_DECL, nonzero if the decl is a register variable with
1211    an explicit asm specification.  */
1212 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
1213
1214 extern void emit_local_var                      PARAMS ((tree));
1215 extern void make_rtl_for_local_static           PARAMS ((tree));
1216 extern tree expand_cond                         PARAMS ((tree));
1217 extern tree c_expand_return                     PARAMS ((tree));
1218 extern tree do_case                             PARAMS ((tree, tree));
1219 extern tree build_stmt                          PARAMS ((enum tree_code, ...));
1220 extern tree build_case_label                    PARAMS ((tree, tree, tree));
1221 extern tree build_continue_stmt                 PARAMS ((void));
1222 extern tree build_break_stmt                    PARAMS ((void));
1223 extern tree build_return_stmt                   PARAMS ((tree));
1224
1225 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
1226
1227 /* Used by the C++ frontend to mark the block around the member
1228    initializers and cleanups.  */
1229 #define COMPOUND_STMT_BODY_BLOCK(NODE)  TREE_LANG_FLAG_3 (NODE)
1230
1231 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
1232
1233 /* These functions must be defined by each front-end which implements
1234    a variant of the C language.  They are used in c-common.c.  */
1235
1236 extern tree build_unary_op                      PARAMS ((enum tree_code,
1237                                                          tree, int));
1238 extern tree build_binary_op                     PARAMS ((enum tree_code,
1239                                                          tree, tree, int));
1240 extern int lvalue_p                             PARAMS ((tree));
1241 extern tree default_conversion                  PARAMS ((tree));
1242
1243 /* Given two integer or real types, return the type for their sum.
1244    Given two compatible ANSI C types, returns the merged type.  */
1245
1246 extern tree common_type                         PARAMS ((tree, tree));
1247
1248 extern tree expand_tree_builtin                 PARAMS ((tree, tree, tree));
1249
1250 extern tree decl_constant_value         PARAMS ((tree));
1251
1252 /* Handle increment and decrement of boolean types.  */
1253 extern tree boolean_increment                   PARAMS ((enum tree_code,
1254                                                          tree));
1255
1256 /* Hook currently used only by the C++ front end to reset internal state
1257    after entering or leaving a header file.  */
1258 extern void extract_interface_info              PARAMS ((void));
1259
1260 extern int case_compare                         PARAMS ((splay_tree_key,
1261                                                          splay_tree_key));
1262
1263 extern tree c_add_case_label                    PARAMS ((splay_tree,
1264                                                          tree, tree,
1265                                                          tree));
1266
1267 extern tree build_function_call                 PARAMS ((tree, tree));
1268
1269 extern tree finish_label_address_expr           PARAMS ((tree));
1270
1271 /* Same function prototype, but the C and C++ front ends have
1272    different implementations.  Used in c-common.c.  */
1273 extern tree lookup_label                        PARAMS ((tree));
1274
1275 extern rtx c_expand_expr                        PARAMS ((tree, rtx,
1276                                                          enum machine_mode,
1277                                                          int));
1278
1279 extern int c_safe_from_p                        PARAMS ((rtx, tree));
1280
1281 extern int c_staticp                            PARAMS ((tree));
1282
1283 extern int c_common_unsafe_for_reeval           PARAMS ((tree));
1284
1285 extern void init_c_lex                          PARAMS ((void));
1286
1287 extern void c_cpp_builtins                      PARAMS ((cpp_reader *));
1288
1289 /* Positive if an implicit `extern "C"' scope has just been entered;
1290    negative if such a scope has just been exited.  */
1291 extern int pending_lang_change;
1292
1293 /* Information recorded about each file examined during compilation.  */
1294
1295 struct c_fileinfo
1296 {
1297   int time;     /* Time spent in the file.  */
1298   short interface_only;         /* Flags - used only by C++ */
1299   short interface_unknown;
1300 };
1301
1302 struct c_fileinfo *get_fileinfo                 PARAMS ((const char *));
1303 extern void dump_time_statistics                PARAMS ((void));
1304
1305 extern bool c_dump_tree                         PARAMS ((void *, tree));
1306
1307 extern void pch_init                            PARAMS ((void));
1308 extern int c_common_valid_pch                   PARAMS ((cpp_reader *pfile,
1309                                                          const char *name,
1310                                                          int fd));
1311 extern void c_common_read_pch                   PARAMS ((cpp_reader *pfile,
1312                                                          const char *name,
1313                                                          int fd,
1314                                                          const char *orig));
1315 extern void c_common_write_pch                  PARAMS ((void));
1316 extern void builtin_define_with_value           PARAMS ((const char *,
1317                                                          const char *, int));
1318 extern void c_stddef_cpp_builtins               PARAMS ((void));
1319 extern void fe_file_change              PARAMS ((const struct line_map *));
1320
1321 /* In c-ppoutput.c  */
1322 extern void init_pp_output                      PARAMS ((FILE *));
1323 extern void preprocess_file                     PARAMS ((cpp_reader *));
1324 extern void pp_file_change              PARAMS ((const struct line_map *));
1325
1326 #endif /* ! GCC_C_COMMON_H */