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, 2004 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 #include "ggc.h"
  28
  29 /* Usage of TREE_LANG_FLAG_?:
  30    0: COMPOUND_STMT_NO_SCOPE (in COMPOUND_STMT).
  31       TREE_NEGATED_INT (in INTEGER_CST).
  32       IDENTIFIER_MARKED (used by search routines).
  33       SCOPE_BEGIN_P (in SCOPE_STMT)
  34       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  35       NEW_FOR_SCOPE_P (in FOR_STMT)
  36       ASM_INPUT_P (in ASM_STMT)
  37       STMT_EXPR_NO_SCOPE (in STMT_EXPR)
  38    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  39       STMT_IS_FULL_EXPR_P (in _STMT)
  40    2: STMT_LINENO_FOR_FN_P (in _STMT)
  41    3: SCOPE_NO_CLEANUPS_P (in SCOPE_STMT)
  42       COMPOUND_STMT_BODY_BLOCK (in COMPOUND_STMT)
  43       STMT_EXPR_WARN_UNUSED_RESULT (in STMT_EXPR)
  44    4: SCOPE_PARTIAL_P (in SCOPE_STMT)
  45 */
  46
  47 /* Reserved identifiers.  This is the union of all the keywords for C,
  48    C++, and Objective-C.  All the type modifiers have to be in one
  49    block at the beginning, because they are used as mask bits.  There
  50    are 27 type modifiers; if we add many more we will have to redesign
  51    the mask mechanism.  */
  52
  53 enum rid
  54 {
  55   /* Modifiers: */
  56   /* C, in empirical order of frequency.  */
  57   RID_STATIC = 0,
  58   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  59   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  60   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  61
  62   /* C extensions */
  63   RID_COMPLEX, RID_THREAD,
  64
  65   /* C++ */
  66   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  67
  68   /* ObjC */
  69   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  70
  71   /* C */
  72   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  73   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  74   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  75   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  76   RID_SIZEOF,
  77
  78   /* C extensions */
  79   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  80   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_PTRBASE,
  81   RID_PTREXTENT, RID_PTRVALUE, RID_CHOOSE_EXPR, RID_TYPES_COMPATIBLE_P,
  82
  83   /* Too many ways of getting the name of a function as a string */
  84   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  85
  86   /* C++ */
  87   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  88   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  89   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  90   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  91   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  92   RID_THIS,     RID_THROW,    RID_TRUE,
  93   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  94   RID_USING,
  95
  96   /* casts */
  97   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  98
  99   /* Objective-C */
 100   RID_ID,          RID_AT_ENCODE,    RID_AT_END,
 101   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 102   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 103   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 104   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 105   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 106   RID_AT_INTERFACE,
 107   RID_AT_IMPLEMENTATION,
 108
 109   RID_MAX,
 110
 111   RID_FIRST_MODIFIER = RID_STATIC,
 112   RID_LAST_MODIFIER = RID_ONEWAY,
 113
 114   RID_FIRST_AT = RID_AT_ENCODE,
 115   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 116   RID_FIRST_PQ = RID_IN,
 117   RID_LAST_PQ = RID_ONEWAY
 118 };
 119
 120 #define OBJC_IS_AT_KEYWORD(rid) \
 121   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 122    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 123
 124 #define OBJC_IS_PQ_KEYWORD(rid) \
 125   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 126    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 127
 128 /* The elements of `ridpointers' are identifier nodes for the reserved
 129    type names and storage classes.  It is indexed by a RID_... value.  */
 130 extern GTY ((length ("(int)RID_MAX"))) tree *ridpointers;
 131
 132 /* Standard named or nameless data types of the C compiler.  */
 133
 134 enum c_tree_index
 135 {
 136     CTI_WCHAR_TYPE,
 137     CTI_SIGNED_WCHAR_TYPE,
 138     CTI_UNSIGNED_WCHAR_TYPE,
 139     CTI_WINT_TYPE,
 140     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 141     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 142     CTI_INTMAX_TYPE,
 143     CTI_UINTMAX_TYPE,
 144     CTI_WIDEST_INT_LIT_TYPE,
 145     CTI_WIDEST_UINT_LIT_TYPE,
 146
 147     CTI_CHAR_ARRAY_TYPE,
 148     CTI_WCHAR_ARRAY_TYPE,
 149     CTI_INT_ARRAY_TYPE,
 150     CTI_STRING_TYPE,
 151     CTI_CONST_STRING_TYPE,
 152
 153     /* Type for boolean expressions (bool in C++, int in C).  */
 154     CTI_TRUTHVALUE_TYPE,
 155     CTI_TRUTHVALUE_TRUE,
 156     CTI_TRUTHVALUE_FALSE,
 157
 158     CTI_DEFAULT_FUNCTION_TYPE,
 159
 160     CTI_G77_INTEGER_TYPE,
 161     CTI_G77_UINTEGER_TYPE,
 162     CTI_G77_LONGINT_TYPE,
 163     CTI_G77_ULONGINT_TYPE,
 164
 165     /* These are not types, but we have to look them up all the time.  */
 166     CTI_FUNCTION_NAME_DECL,
 167     CTI_PRETTY_FUNCTION_NAME_DECL,
 168     CTI_C99_FUNCTION_NAME_DECL,
 169     CTI_SAVED_FUNCTION_NAME_DECLS,
 170
 171     CTI_VOID_ZERO,
 172
 173     CTI_MAX
 174 };
 175
 176 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 177
 178 /* Identifier part common to the C front ends.  Inherits from
 179    tree_identifier, despite appearances.  */
 180 struct c_common_identifier GTY(())
 181 {
 182   struct tree_common common;
 183   struct cpp_hashnode node;
 184 };
 185
 186 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 187 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 188 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 189 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 190 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 191 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 192 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 193 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 194 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 195 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 196
 197 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 198 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 199 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 200
 201 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 202 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 203 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 204 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 205 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 206
 207 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 208
 209 /* g77 integer types, which must be kept in sync with f/com.h */
 210 #define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
 211 #define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
 212 #define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
 213 #define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
 214
 215 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 216 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 217 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 218 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 219
 220 /* A node for `((void) 0)'.  */
 221 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 222
 223 extern GTY(()) tree c_global_trees[CTI_MAX];
 224
 225 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 226    tree for size reasons.  */
 227 struct sorted_fields_type GTY(())
 228 {
 229   int len;
 230   tree GTY((length ("%h.len"))) elts[1];
 231 };
 232
 233 /* Mark which labels are explicitly declared.
 234    These may be shadowed, and may be referenced from nested functions.  */
 235 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 236
 237 /* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
 238    warning if they undergo concatenation.  */
 239 #define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
 240
 241 typedef enum c_language_kind
 242 {
 243   clk_c         = 0,            /* C90, C94 or C99 */
 244   clk_objc      = 1,            /* clk_c with ObjC features.  */
 245   clk_cxx       = 2,            /* ANSI/ISO C++ */
 246   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 247 }
 248 c_language_kind;
 249
 250 /* To test for a specific language use c_language, defined by each
 251    front end.  For "ObjC features" or "not C++" use the macros.  */
 252 extern c_language_kind c_language;
 253
 254 #define c_dialect_cxx()         (c_language & clk_cxx)
 255 #define c_dialect_objc()        (c_language & clk_objc)
 256
 257 /* Information about a statement tree.  */
 258
 259 struct stmt_tree_s GTY(()) {
 260   /* The last statement added to the tree.  */
 261   tree x_last_stmt;
 262   /* The type of the last expression statement.  (This information is
 263      needed to implement the statement-expression extension.)  */
 264   tree x_last_expr_type;
 265   /* The last filename we recorded.  */
 266   const char *x_last_expr_filename;
 267   /* In C++, Nonzero if we should treat statements as full
 268      expressions.  In particular, this variable is no-zero if at the
 269      end of a statement we should destroy any temporaries created
 270      during that statement.  Similarly, if, at the end of a block, we
 271      should destroy any local variables in this block.  Normally, this
 272      variable is nonzero, since those are the normal semantics of
 273      C++.
 274
 275      However, in order to represent aggregate initialization code as
 276      tree structure, we use statement-expressions.  The statements
 277      within the statement expression should not result in cleanups
 278      being run until the entire enclosing statement is complete.
 279
 280      This flag has no effect in C.  */
 281   int stmts_are_full_exprs_p;
 282 };
 283
 284 typedef struct stmt_tree_s *stmt_tree;
 285
 286 /* Global state pertinent to the current function.  Some C dialects
 287    extend this structure with additional fields.  */
 288
 289 struct c_language_function GTY(()) {
 290   /* While we are parsing the function, this contains information
 291      about the statement-tree that we are building.  */
 292   struct stmt_tree_s x_stmt_tree;
 293   /* The stack of SCOPE_STMTs for the current function.  */
 294   tree x_scope_stmt_stack;
 295 };
 296
 297 /* When building a statement-tree, this is the last statement added to
 298    the tree.  */
 299
 300 #define last_tree (current_stmt_tree ()->x_last_stmt)
 301
 302 /* The type of the last expression-statement we have seen.  */
 303
 304 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 305
 306 /* The name of the last file we have seen.  */
 307
 308 #define last_expr_filename (current_stmt_tree ()->x_last_expr_filename)
 309
 310 /* LAST_TREE contains the last statement parsed.  These are chained
 311    together through the TREE_CHAIN field, but often need to be
 312    re-organized since the parse is performed bottom-up.  This macro
 313    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 314
 315 #define RECHAIN_STMTS(stmt, substmt)            \
 316   do {                                          \
 317     substmt = TREE_CHAIN (stmt);                \
 318     TREE_CHAIN (stmt) = NULL_TREE;              \
 319     last_tree = stmt;                           \
 320   } while (0)
 321
 322 /* Language-specific hooks.  */
 323
 324 extern void (*lang_expand_stmt) (tree);
 325 extern void (*lang_expand_decl_stmt) (tree);
 326 extern void (*lang_expand_function_end) (void);
 327
 328 /* Callback that determines if it's ok for a function to have no
 329    noreturn attribute.  */
 330 extern int (*lang_missing_noreturn_ok_p) (tree);
 331
 332 extern int yyparse (void);
 333 extern void free_parser_stacks (void);
 334
 335 extern stmt_tree current_stmt_tree (void);
 336 extern tree *current_scope_stmt_stack (void);
 337 extern void begin_stmt_tree (tree *);
 338 extern tree add_stmt (tree);
 339 extern void add_decl_stmt (tree);
 340 extern tree add_scope_stmt (int, int);
 341 extern void finish_stmt_tree (tree *);
 342
 343 extern tree walk_stmt_tree (tree *, walk_tree_fn, void *);
 344 extern void prep_stmt (tree);
 345 extern void expand_stmt (tree);
 346 extern tree c_begin_if_stmt (void);
 347 extern tree c_begin_while_stmt (void);
 348 extern void c_finish_while_stmt_cond (tree, tree);
 349
 350 enum sw_kind { SW_PARAM = 0, SW_LOCAL, SW_GLOBAL };
 351 extern void shadow_warning (enum sw_kind, const char *, tree);
 352 extern int field_decl_cmp (const void *, const void *);
 353 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 354                                   void *);
 355 \f
 356 /* Switches common to the C front ends.  */
 357
 358 /* Nonzero if prepreprocessing only.  */
 359
 360 extern int flag_preprocess_only;
 361
 362 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 363    calls will be used in ObjC; passing nil receivers to such calls
 364    will most likely result in crashes.  */
 365 extern int flag_nil_receivers;
 366
 367 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 368    @try, etc.) in source code.  */
 369 extern int flag_objc_exceptions;
 370
 371 /* Nonzero means that code generation will be altered to support
 372    "zero-link" execution.  This currently affects ObjC only, but may
 373    affect other languages in the future.  */
 374 extern int flag_zero_link;
 375
 376 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 377    unit.  It will inform the ObjC runtime that class definition(s) herein
 378    contained are to replace one(s) previously loaded.  */
 379 extern int flag_replace_objc_classes;
 380
 381 /* Nonzero means don't output line number information.  */
 382
 383 extern char flag_no_line_commands;
 384
 385 /* Nonzero causes -E output not to be done, but directives such as
 386    #define that have side effects are still obeyed.  */
 387
 388 extern char flag_no_output;
 389
 390 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 391    'N' of the command line switch.  */
 392
 393 extern char flag_dump_macros;
 394
 395 /* Nonzero means pass #include lines through to the output.  */
 396
 397 extern char flag_dump_includes;
 398
 399 /* The file name to which we should write a precompiled header, or
 400    NULL if no header will be written in this compile.  */
 401
 402 extern const char *pch_file;
 403
 404 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 405    user's namespace.  */
 406
 407 extern int flag_iso;
 408
 409 /* Nonzero if -undef was given.  It suppresses target built-in macros
 410    and assertions.  */
 411
 412 extern int flag_undef;
 413
 414 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 415
 416 extern int flag_no_builtin;
 417
 418 /* Nonzero means don't recognize the non-ANSI builtin functions.
 419    -ansi sets this.  */
 420
 421 extern int flag_no_nonansi_builtin;
 422
 423 /* Nonzero means give `double' the same size as `float'.  */
 424
 425 extern int flag_short_double;
 426
 427 /* Nonzero means give `wchar_t' the same size as `short'.  */
 428
 429 extern int flag_short_wchar;
 430
 431 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 432 extern int flag_ms_extensions;
 433
 434 /* Nonzero means don't recognize the keyword `asm'.  */
 435
 436 extern int flag_no_asm;
 437
 438 /* Nonzero means give string constants the type `const char *', as mandated
 439    by the standard.  */
 440
 441 extern int flag_const_strings;
 442
 443 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 444
 445 extern int flag_signed_bitfields;
 446 extern int explicit_flag_signed_bitfields;
 447
 448 /* Nonzero means warn about pointer casts that can drop a type qualifier
 449    from the pointer target type.  */
 450
 451 extern int warn_cast_qual;
 452
 453 /* Warn about functions which might be candidates for format attributes.  */
 454
 455 extern int warn_missing_format_attribute;
 456
 457 /* Nonzero means warn about sizeof(function) or addition/subtraction
 458    of function pointers.  */
 459
 460 extern int warn_pointer_arith;
 461
 462 /* Nonzero means warn for any global function def
 463    without separate previous prototype decl.  */
 464
 465 extern int warn_missing_prototypes;
 466
 467 /* Warn if adding () is suggested.  */
 468
 469 extern int warn_parentheses;
 470
 471 /* Warn if initializer is not completely bracketed.  */
 472
 473 extern int warn_missing_braces;
 474
 475 /* Warn about comparison of signed and unsigned values.
 476    If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified.  */
 477
 478 extern int warn_sign_compare;
 479
 480 /* Nonzero means warn about usage of long long when `-pedantic'.  */
 481
 482 extern int warn_long_long;
 483
 484 /* Nonzero means warn about deprecated conversion from string constant to
 485    `char *'.  */
 486
 487 extern int warn_write_strings;
 488
 489 /* Nonzero means warn about multiple (redundant) decls for the same single
 490    variable or function.  */
 491
 492 extern int warn_redundant_decls;
 493
 494 /* Warn about testing equality of floating point numbers.  */
 495
 496 extern int warn_float_equal;
 497
 498 /* Warn about a subscript that has type char.  */
 499
 500 extern int warn_char_subscripts;
 501
 502 /* Warn if a type conversion is done that might have confusing results.  */
 503
 504 extern int warn_conversion;
 505
 506 /* Warn about #pragma directives that are not recognized.  */
 507
 508 extern int warn_unknown_pragmas; /* Tri state variable.  */
 509
 510 /* Warn about format/argument anomalies in calls to formatted I/O functions
 511    (*printf, *scanf, strftime, strfmon, etc.).  */
 512
 513 extern int warn_format;
 514
 515 /* Warn about Y2K problems with strftime formats.  */
 516
 517 extern int warn_format_y2k;
 518
 519 /* Warn about excess arguments to formats.  */
 520
 521 extern int warn_format_extra_args;
 522
 523 /* Warn about zero-length formats.  */
 524
 525 extern int warn_format_zero_length;
 526
 527 /* Warn about non-literal format arguments.  */
 528
 529 extern int warn_format_nonliteral;
 530
 531 /* Warn about possible security problems with calls to format functions.  */
 532
 533 extern int warn_format_security;
 534
 535
 536 /* C/ObjC language option variables.  */
 537
 538
 539 /* Nonzero means message about use of implicit function declarations;
 540  1 means warning; 2 means error.  */
 541
 542 extern int mesg_implicit_function_declaration;
 543
 544 /* Nonzero means allow type mismatches in conditional expressions;
 545    just make their values `void'.  */
 546
 547 extern int flag_cond_mismatch;
 548
 549 /* Nonzero means enable C89 Amendment 1 features.  */
 550
 551 extern int flag_isoc94;
 552
 553 /* Nonzero means use the ISO C99 dialect of C.  */
 554
 555 extern int flag_isoc99;
 556
 557 /* Nonzero means that we have builtin functions, and main is an int.  */
 558
 559 extern int flag_hosted;
 560
 561 /* Nonzero means warn when casting a function call to a type that does
 562    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 563    when there is no previous declaration of sqrt or malloc.  */
 564
 565 extern int warn_bad_function_cast;
 566
 567 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 568
 569 extern int warn_traditional;
 570
 571 /* Nonzero means warn for a declaration found after a statement.  */
 572
 573 extern int warn_declaration_after_statement;
 574
 575 /* Nonzero means warn for non-prototype function decls
 576    or non-prototyped defs without previous prototype.  */
 577
 578 extern int warn_strict_prototypes;
 579
 580 /* Nonzero means warn for any global function def
 581    without separate previous decl.  */
 582
 583 extern int warn_missing_declarations;
 584
 585 /* Nonzero means warn about extern declarations of objects not at
 586    file-scope level and about *all* declarations of functions (whether
 587    extern or static) not at file-scope level.  Note that we exclude
 588    implicit function declarations.  To get warnings about those, use
 589    -Wimplicit.  */
 590
 591 extern int warn_nested_externs;
 592
 593 /* Warn if main is suspicious.  */
 594
 595 extern int warn_main;
 596
 597 /* Nonzero means warn about possible violations of sequence point rules.  */
 598
 599 extern int warn_sequence_point;
 600
 601 /* Nonzero means warn about uninitialized variable when it is initialized with itself.
 602    For example: int i = i;, GCC will not warn about this when warn_init_self is nonzero.  */
 603
 604 extern int warn_init_self;
 605
 606
 607 /* Nonzero means to warn about compile-time division by zero.  */
 608 extern int warn_div_by_zero;
 609
 610 /* Nonzero means warn about use of implicit int.  */
 611
 612 extern int warn_implicit_int;
 613
 614 /* Warn about NULL being passed to argument slots marked as requiring
 615    non-NULL.  */
 616
 617 extern int warn_nonnull;
 618
 619 /* Warn about old-style parameter declaration.  */
 620
 621 extern int warn_old_style_definition;
 622
 623
 624 /* ObjC language option variables.  */
 625
 626
 627 /* Open and close the file for outputting class declarations, if
 628    requested (ObjC).  */
 629
 630 extern int flag_gen_declaration;
 631
 632 /* Generate code for GNU or NeXT runtime environment.  */
 633
 634 extern int flag_next_runtime;
 635
 636 /* Tells the compiler that this is a special run.  Do not perform any
 637    compiling, instead we are to test some platform dependent features
 638    and output a C header file with appropriate definitions.  */
 639
 640 extern int print_struct_values;
 641
 642 /* ???.  Undocumented.  */
 643
 644 extern const char *constant_string_class_name;
 645
 646 /* Warn if multiple methods are seen for the same selector, but with
 647    different argument types.  Performs the check on the whole selector
 648    table at the end of compilation.  */
 649
 650 extern int warn_selector;
 651
 652 /* Warn if a @selector() is found, and no method with that selector
 653    has been previously declared.  The check is done on each
 654    @selector() as soon as it is found - so it warns about forward
 655    declarations.  */
 656
 657 extern int warn_undeclared_selector;
 658
 659 /* Warn if methods required by a protocol are not implemented in the
 660    class adopting it.  When turned off, methods inherited to that
 661    class are also considered implemented.  */
 662
 663 extern int warn_protocol;
 664
 665
 666 /* C++ language option variables.  */
 667
 668
 669 /* Nonzero means don't recognize any extension keywords.  */
 670
 671 extern int flag_no_gnu_keywords;
 672
 673 /* Nonzero means do emit exported implementations of functions even if
 674    they can be inlined.  */
 675
 676 extern int flag_implement_inlines;
 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 /* 0 means we want the preprocessor to not emit line directives for
 744    the current working directory.  1 means we want it to do it.  -1
 745    means we should decide depending on whether debugging information
 746    is being emitted or not.  */
 747
 748 extern int flag_working_directory;
 749
 750 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 751    destructors for local statics and global objects.  */
 752
 753 extern int flag_use_cxa_atexit;
 754
 755 /* Nonzero means make the default pedwarns warnings instead of errors.
 756    The value of this flag is ignored if -pedantic is specified.  */
 757
 758 extern int flag_permissive;
 759
 760 /* Nonzero means to implement standard semantics for exception
 761    specifications, calling unexpected if an exception is thrown that
 762    doesn't match the specification.  Zero means to treat them as
 763    assertions and optimize accordingly, but not check them.  */
 764
 765 extern int flag_enforce_eh_specs;
 766
 767 /*  The version of the C++ ABI in use.  The following values are
 768     allowed:
 769
 770     0: The version of the ABI believed most conformant with the
 771        C++ ABI specification.  This ABI may change as bugs are
 772        discovered and fixed.  Therefore, 0 will not necessarily
 773        indicate the same ABI in different versions of G++.
 774
 775     1: The version of the ABI first used in G++ 3.2.
 776
 777     Additional positive integers will be assigned as new versions of
 778     the ABI become the default version of the ABI.  */
 779
 780 extern int flag_abi_version;
 781
 782 /* Nonzero means warn about things that will change when compiling
 783    with an ABI-compliant compiler.  */
 784
 785 extern int warn_abi;
 786
 787 /* Nonzero means warn about invalid uses of offsetof.  */
 788
 789 extern int warn_invalid_offsetof;
 790
 791 /* Nonzero means warn about implicit declarations.  */
 792
 793 extern int warn_implicit;
 794
 795 /* Nonzero means warn when all ctors or dtors are private, and the class
 796    has no friends.  */
 797
 798 extern int warn_ctor_dtor_privacy;
 799
 800 /* Nonzero means warn in function declared in derived class has the
 801    same name as a virtual in the base class, but fails to match the
 802    type signature of any virtual function in the base class.  */
 803
 804 extern int warn_overloaded_virtual;
 805
 806 /* Nonzero means warn when declaring a class that has a non virtual
 807    destructor, when it really ought to have a virtual one.  */
 808
 809 extern int warn_nonvdtor;
 810
 811 /* Nonzero means warn when the compiler will reorder code.  */
 812
 813 extern int warn_reorder;
 814
 815 /* Nonzero means warn when synthesis behavior differs from Cfront's.  */
 816
 817 extern int warn_synth;
 818
 819 /* Nonzero means warn when we convert a pointer to member function
 820    into a pointer to (void or function).  */
 821
 822 extern int warn_pmf2ptr;
 823
 824 /* Nonzero means warn about violation of some Effective C++ style rules.  */
 825
 826 extern int warn_ecpp;
 827
 828 /* Nonzero means warn where overload resolution chooses a promotion from
 829    unsigned to signed over a conversion to an unsigned of the same size.  */
 830
 831 extern int warn_sign_promo;
 832
 833 /* Nonzero means warn when an old-style cast is used.  */
 834
 835 extern int warn_old_style_cast;
 836
 837 /* Nonzero means warn when non-templatized friend functions are
 838    declared within a template */
 839
 840 extern int warn_nontemplate_friend;
 841
 842 /* Nonzero means complain about deprecated features.  */
 843
 844 extern int warn_deprecated;
 845
 846 /* Maximum template instantiation depth.  This limit is rather
 847    arbitrary, but it exists to limit the time it takes to notice
 848    infinite template instantiations.  */
 849
 850 extern int max_tinst_depth;
 851
 852 /* Nonzero means the expression being parsed will never be evaluated.
 853    This is a count, since unevaluated expressions can nest.  */
 854
 855 extern int skip_evaluation;
 856
 857 /* C types are partitioned into three subsets: object, function, and
 858    incomplete types.  */
 859 #define C_TYPE_OBJECT_P(type) \
 860   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 861
 862 #define C_TYPE_INCOMPLETE_P(type) \
 863   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 864
 865 #define C_TYPE_FUNCTION_P(type) \
 866   (TREE_CODE (type) == FUNCTION_TYPE)
 867
 868 /* For convenience we define a single macro to identify the class of
 869    object or incomplete types.  */
 870 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 871   (!C_TYPE_FUNCTION_P (type))
 872
 873 /* Record in each node resulting from a binary operator
 874    what operator was specified for it.  */
 875 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 876
 877 /* Attribute table common to the C front ends.  */
 878 extern const struct attribute_spec c_common_attribute_table[];
 879 extern const struct attribute_spec c_common_format_attribute_table[];
 880
 881 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 882    ID is the identifier to use, NAME is the string.
 883    TYPE_DEP indicates whether it depends on type of the function or not
 884    (i.e. __PRETTY_FUNCTION__).  */
 885
 886 extern tree (*make_fname_decl) (tree, int);
 887
 888 extern tree identifier_global_value (tree);
 889 extern void record_builtin_type (enum rid, const char *, tree);
 890 extern tree build_void_list_node (void);
 891 extern void start_fname_decls (void);
 892 extern void finish_fname_decls (void);
 893 extern const char *fname_as_string (int);
 894 extern tree fname_decl (unsigned, tree);
 895
 896 extern void check_function_arguments (tree, tree);
 897 extern void check_function_arguments_recurse (void (*)
 898                                               (void *, tree,
 899                                                unsigned HOST_WIDE_INT),
 900                                               void *, tree,
 901                                               unsigned HOST_WIDE_INT);
 902 extern void check_function_format (int *, tree, tree);
 903 extern void set_Wformat (int);
 904 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 905 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 906 extern int c_common_handle_option (size_t code, const char *arg, int value);
 907 extern bool c_common_missing_argument (const char *opt, size_t code);
 908 extern tree c_common_type_for_mode (enum machine_mode, int);
 909 extern tree c_common_type_for_size (unsigned int, int);
 910 extern tree c_common_unsigned_type (tree);
 911 extern tree c_common_signed_type (tree);
 912 extern tree c_common_signed_or_unsigned_type (int, tree);
 913 extern tree c_common_truthvalue_conversion (tree);
 914 extern void c_apply_type_quals_to_decl (int, tree);
 915 extern tree c_sizeof_or_alignof_type (tree, enum tree_code, int);
 916 extern tree c_alignof_expr (tree);
 917 /* Print an error message for invalid operands to arith operation CODE.
 918    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 919 extern void binary_op_error (enum tree_code);
 920 #define my_friendly_assert(EXP, N) (void) \
 921  (((EXP) == 0) ? (fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0) : 0)
 922
 923 extern tree c_expand_expr_stmt (tree);
 924 extern void c_expand_start_cond (tree, int, tree);
 925 extern void c_finish_then (void);
 926 extern void c_expand_start_else (void);
 927 extern void c_finish_else (void);
 928 extern void c_expand_end_cond (void);
 929 /* Validate the expression after `case' and apply default promotions.  */
 930 extern tree check_case_value (tree);
 931 extern tree fix_string_type (tree);
 932 struct varray_head_tag;
 933 extern void constant_expression_warning (tree);
 934 extern tree convert_and_check (tree, tree);
 935 extern void overflow_warning (tree);
 936 extern void unsigned_conversion_warning (tree, tree);
 937
 938 /* Read the rest of the current #-directive line.  */
 939 extern char *get_directive_line (void);
 940 #define GET_DIRECTIVE_LINE() get_directive_line ()
 941 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 1)
 942 #define c_alignof(T) c_sizeof_or_alignof_type (T, ALIGNOF_EXPR, 1)
 943
 944 /* Subroutine of build_binary_op, used for comparison operations.
 945    See if the operands have both been converted from subword integer types
 946    and, if so, perhaps change them both back to their original type.  */
 947 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 948
 949 extern tree pointer_int_sum (enum tree_code, tree, tree);
 950 extern unsigned int min_precision (tree, int);
 951
 952 /* Add qualifiers to a type, in the fashion for C.  */
 953 extern tree c_build_qualified_type (tree, int);
 954
 955 /* Build tree nodes and builtin functions common to both C and C++ language
 956    frontends.  */
 957 extern void c_common_nodes_and_builtins (void);
 958
 959 extern void disable_builtin_function (const char *);
 960
 961 extern tree build_va_arg (tree, tree);
 962
 963 extern unsigned int c_common_init_options (unsigned int, const char **);
 964 extern bool c_common_post_options (const char **);
 965 extern bool c_common_init (void);
 966 extern void c_common_finish (void);
 967 extern void c_common_parse_file (int);
 968 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 969 extern void c_register_builtin_type (tree, const char*);
 970 extern bool c_promoting_integer_type_p (tree);
 971 extern int self_promoting_args_p (tree);
 972 extern tree strip_array_types (tree);
 973 extern tree strip_pointer_operator (tree);
 974
 975 /* This function resets the parsers' state in preparation for parsing
 976    a new file.  */
 977 extern void c_reset_state (void);
 978 /* This is the basic parsing function.  */
 979 extern void c_parse_file (void);
 980 /* This is misnamed, it actually performs end-of-compilation processing.  */
 981 extern void finish_file (void);
 982
 983 /* These macros provide convenient access to the various _STMT nodes.  */
 984
 985 /* Nonzero if this statement should be considered a full-expression,
 986    i.e., if temporaries created during this statement should have
 987    their destructors run at the end of this statement.  (In C, this
 988    will always be false, since there are no destructors.)  */
 989 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 990
 991 /* IF_STMT accessors. These give access to the condition of the if
 992    statement, the then block of the if statement, and the else block
 993    of the if statement if it exists.  */
 994 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 995 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 996 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 997
 998 /* WHILE_STMT accessors. These give access to the condition of the
 999    while statement and the body of the while statement, respectively.  */
1000 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
1001 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
1002
1003 /* DO_STMT accessors. These give access to the condition of the do
1004    statement and the body of the do statement, respectively.  */
1005 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
1006 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
1007
1008 /* RETURN_STMT accessors. These give the expression associated with a
1009    return statement, and whether it should be ignored when expanding
1010    (as opposed to inlining).  */
1011 #define RETURN_STMT_EXPR(NODE)  TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
1012
1013 /* EXPR_STMT accessor. This gives the expression associated with an
1014    expression statement.  */
1015 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
1016
1017 /* FOR_STMT accessors. These give access to the init statement,
1018    condition, update expression, and body of the for statement,
1019    respectively.  */
1020 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
1021 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
1022 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
1023 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
1024
1025 /* SWITCH_STMT accessors. These give access to the condition, body and
1026    original condition type (before any compiler conversions)
1027    of the switch statement, respectively.  */
1028 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
1029 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
1030 #define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
1031
1032 /* CASE_LABEL accessors. These give access to the high and low values
1033    of a case label, respectively.  */
1034 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
1035 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
1036 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
1037
1038 /* GOTO_STMT accessor. This gives access to the label associated with
1039    a goto statement.  */
1040 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
1041 /* True for goto created artificially by the compiler.  */
1042 #define GOTO_FAKE_P(NODE)       (TREE_LANG_FLAG_0 (GOTO_STMT_CHECK (NODE)))
1043
1044 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
1045    statements associated with a compound statement. The result is the
1046    first statement in the list. Succeeding nodes can be accessed by
1047    calling TREE_CHAIN on a node in the list.  */
1048 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
1049
1050 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
1051    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
1052    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
1053    statement.  */
1054 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
1055 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
1056 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
1057 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
1058 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
1059
1060 /* DECL_STMT accessor. This gives access to the DECL associated with
1061    the given declaration statement.  */
1062 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
1063
1064 /* STMT_EXPR accessor.  */
1065 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
1066
1067 /* Nonzero if this statement-expression does not have an associated scope.  */
1068 #define STMT_EXPR_NO_SCOPE(NODE) \
1069    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
1070
1071 /* Nonzero if this statement-expression should cause warning if its result
1072    is not used.  */
1073 #define STMT_EXPR_WARN_UNUSED_RESULT(NODE) \
1074    TREE_LANG_FLAG_3 (STMT_EXPR_CHECK (NODE))
1075
1076 /* LABEL_STMT accessor. This gives access to the label associated with
1077    the given label statement.  */
1078 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
1079
1080 /* COMPOUND_LITERAL_EXPR accessors.  */
1081 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
1082   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
1083 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
1084   DECL_STMT_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
1085
1086 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
1087 #define SCOPE_BEGIN_P(NODE) \
1088   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
1089
1090 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
1091 #define SCOPE_END_P(NODE) \
1092   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
1093
1094 /* The BLOCK containing the declarations contained in this scope.  */
1095 #define SCOPE_STMT_BLOCK(NODE) \
1096   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
1097
1098 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
1099 #define SCOPE_NULLIFIED_P(NODE) \
1100   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
1101
1102 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
1103    which should be treated as non-existent from the point of view of
1104    running cleanup actions.  */
1105 #define SCOPE_NO_CLEANUPS_P(NODE) \
1106   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
1107
1108 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
1109    For example, in:
1110
1111      S s;
1112      l:
1113      S s2;
1114      goto l;
1115
1116    there is (implicitly) a new scope after `l', even though there are
1117    no curly braces.  In particular, when we hit the goto, we must
1118    destroy s2 and then re-construct it.  For the implicit scope,
1119    SCOPE_PARTIAL_P will be set.  */
1120 #define SCOPE_PARTIAL_P(NODE) \
1121   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
1122
1123 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
1124 #define ASM_VOLATILE_P(NODE)                    \
1125   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
1126
1127 /* The VAR_DECL to clean up in a CLEANUP_STMT.  */
1128 #define CLEANUP_DECL(NODE) \
1129   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
1130 /* The cleanup to run in a CLEANUP_STMT.  */
1131 #define CLEANUP_EXPR(NODE) \
1132   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
1133
1134 /* The filename we are changing to as of this FILE_STMT.  */
1135 #define FILE_STMT_FILENAME_NODE(NODE) \
1136   (TREE_OPERAND (FILE_STMT_CHECK (NODE), 0))
1137 #define FILE_STMT_FILENAME(NODE) \
1138   (IDENTIFIER_POINTER (FILE_STMT_FILENAME_NODE (NODE)))
1139
1140 /* The line-number at which a statement began.  But if
1141    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
1142    line number for the end of the current function instead.  */
1143 #define STMT_LINENO(NODE)                       \
1144   (TREE_COMPLEXITY ((NODE)))
1145
1146 /* If nonzero, the STMT_LINENO for NODE is the line at which the
1147    function ended.  */
1148 #define STMT_LINENO_FOR_FN_P(NODE)              \
1149   (TREE_LANG_FLAG_2 ((NODE)))
1150
1151 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
1152    initialization variables.  */
1153 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
1154
1155 /* Nonzero if we want to create an ASM_INPUT instead of an
1156    ASM_OPERAND with no operands.  */
1157 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
1158
1159 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
1160
1161 enum c_tree_code {
1162   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
1163 #include "c-common.def"
1164   LAST_C_TREE_CODE
1165 };
1166
1167 #undef DEFTREECODE
1168
1169 #define c_common_stmt_codes                             \
1170    CLEANUP_STMT,        EXPR_STMT,      COMPOUND_STMT,  \
1171    DECL_STMT,           IF_STMT,        FOR_STMT,       \
1172    WHILE_STMT,          DO_STMT,        RETURN_STMT,    \
1173    BREAK_STMT,          CONTINUE_STMT,  SCOPE_STMT,     \
1174    SWITCH_STMT,         GOTO_STMT,      LABEL_STMT,     \
1175    ASM_STMT,            FILE_STMT,      CASE_LABEL
1176
1177 /* TRUE if a code represents a statement.  The front end init
1178    langhook should take care of initialization of this array.  */
1179 extern bool statement_code_p[MAX_TREE_CODES];
1180
1181 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
1182
1183 #define INIT_STATEMENT_CODES(STMT_CODES)                        \
1184   do {                                                          \
1185     unsigned int i;                                             \
1186     memset (&statement_code_p, 0, sizeof (statement_code_p));   \
1187     for (i = 0; i < ARRAY_SIZE (STMT_CODES); i++)               \
1188       statement_code_p[STMT_CODES[i]] = true;                   \
1189   } while (0)
1190
1191 extern void genrtl_do_pushlevel (void);
1192 extern void genrtl_goto_stmt (tree);
1193 extern void genrtl_expr_stmt (tree);
1194 extern void genrtl_expr_stmt_value (tree, int, int);
1195 extern void genrtl_decl_stmt (tree);
1196 extern void genrtl_if_stmt (tree);
1197 extern void genrtl_while_stmt (tree);
1198 extern void genrtl_do_stmt (tree);
1199 extern void genrtl_return_stmt (tree);
1200 extern void genrtl_for_stmt (tree);
1201 extern void genrtl_break_stmt (void);
1202 extern void genrtl_continue_stmt (void);
1203 extern void genrtl_scope_stmt (tree);
1204 extern void genrtl_switch_stmt (tree);
1205 extern void genrtl_case_label (tree);
1206 extern void genrtl_compound_stmt (tree);
1207 extern void genrtl_asm_stmt (tree, tree, tree, tree, tree, int);
1208 extern void genrtl_cleanup_stmt (tree);
1209 extern int stmts_are_full_exprs_p (void);
1210 extern int anon_aggr_type_p (tree);
1211
1212 /* For a VAR_DECL that is an anonymous union, these are the various
1213    sub-variables that make up the anonymous union.  */
1214 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
1215
1216 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
1217 #define DECL_C_BIT_FIELD(NODE) \
1218   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
1219 #define SET_DECL_C_BIT_FIELD(NODE) \
1220   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
1221 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
1222   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
1223
1224 /* In a VAR_DECL, nonzero if the decl is a register variable with
1225    an explicit asm specification.  */
1226 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
1227
1228 extern void emit_local_var (tree);
1229 extern void make_rtl_for_local_static (tree);
1230 extern tree expand_cond (tree);
1231 extern tree c_expand_return (tree);
1232 extern tree do_case (tree, tree);
1233 extern tree build_stmt (enum tree_code, ...);
1234 extern tree build_case_label (tree, tree, tree);
1235 extern tree build_continue_stmt (void);
1236 extern tree build_break_stmt (void);
1237 extern tree build_return_stmt (tree);
1238
1239 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
1240
1241 /* Used by the C++ frontend to mark the block around the member
1242    initializers and cleanups.  */
1243 #define COMPOUND_STMT_BODY_BLOCK(NODE)  TREE_LANG_FLAG_3 (NODE)
1244
1245 extern void c_expand_asm_operands (tree, tree, tree, tree, int, location_t);
1246
1247 /* These functions must be defined by each front-end which implements
1248    a variant of the C language.  They are used in c-common.c.  */
1249
1250 extern tree build_unary_op (enum tree_code, tree, int);
1251 extern tree build_binary_op (enum tree_code, tree, tree, int);
1252 extern int lvalue_p (tree);
1253 extern tree default_conversion (tree);
1254
1255 /* Given two integer or real types, return the type for their sum.
1256    Given two compatible ANSI C types, returns the merged type.  */
1257
1258 extern tree common_type (tree, tree);
1259
1260 extern tree expand_tree_builtin (tree, tree, tree);
1261
1262 extern tree decl_constant_value (tree);
1263
1264 /* Handle increment and decrement of boolean types.  */
1265 extern tree boolean_increment (enum tree_code, tree);
1266
1267 /* Hook currently used only by the C++ front end to reset internal state
1268    after entering or leaving a header file.  */
1269 extern void extract_interface_info (void);
1270
1271 extern int case_compare (splay_tree_key, splay_tree_key);
1272
1273 extern tree c_add_case_label (splay_tree, tree, tree, tree);
1274
1275 extern tree build_function_call (tree, tree);
1276
1277 extern tree finish_label_address_expr (tree);
1278
1279 /* Same function prototype, but the C and C++ front ends have
1280    different implementations.  Used in c-common.c.  */
1281 extern tree lookup_label (tree);
1282
1283 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
1284
1285 extern int c_safe_from_p (rtx, tree);
1286
1287 extern int c_staticp (tree);
1288
1289 extern int c_common_unsafe_for_reeval (tree);
1290
1291 extern void init_c_lex (void);
1292
1293 extern void c_cpp_builtins (cpp_reader *);
1294
1295 /* Positive if an implicit `extern "C"' scope has just been entered;
1296    negative if such a scope has just been exited.  */
1297 extern int pending_lang_change;
1298
1299 /* Information recorded about each file examined during compilation.  */
1300
1301 struct c_fileinfo
1302 {
1303   int time;     /* Time spent in the file.  */
1304   short interface_only;         /* Flags - used only by C++ */
1305   short interface_unknown;
1306 };
1307
1308 struct c_fileinfo *get_fileinfo (const char *);
1309 extern void dump_time_statistics (void);
1310
1311 extern bool c_dump_tree (void *, tree);
1312
1313 extern void pch_init (void);
1314 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1315 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1316                                const char *orig);
1317 extern void c_common_write_pch (void);
1318 extern void c_common_no_more_pch (void);
1319 extern void builtin_define_with_value (const char *, const char *, int);
1320 extern void c_stddef_cpp_builtins (void);
1321 extern void fe_file_change (const struct line_map *);
1322 extern int c_estimate_num_insns (tree decl);
1323 extern bool c_decl_uninit (tree t);
1324 extern void c_parse_error (const char *, enum cpp_ttype, tree);
1325
1326 /* The following have been moved here from c-tree.h, since they're needed
1327    in the ObjC++ world, too.  What is more, stub-objc.c could use a few
1328    prototypes.  */
1329 extern tree lookup_interface (tree);
1330 extern tree is_class_name (tree);
1331 extern tree objc_is_object_ptr (tree);
1332 extern void objc_check_decl (tree);
1333 extern int objc_comptypes (tree, tree, int);
1334 extern tree objc_message_selector (void);
1335 extern tree lookup_objc_ivar (tree);
1336 extern void *get_current_scope (void);
1337 extern void objc_mark_locals_volatile (void *);
1338
1339 /* In c-ppoutput.c  */
1340 extern void init_pp_output (FILE *);
1341 extern void preprocess_file (cpp_reader *);
1342 extern void pp_file_change (const struct line_map *);
1343
1344 #endif /* ! GCC_C_COMMON_H */