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 #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_OPERATOR, RID_THIS,
  92   RID_THROW,    RID_TRUE,     RID_TRY,
  93   RID_TYPENAME, RID_TYPEID,   RID_USING,
  94
  95   /* casts */
  96   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  97
  98   /* Objective-C */
  99   RID_ID,          RID_AT_ENCODE,    RID_AT_END,
 100   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 101   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 102   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 103   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 104   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 105   RID_AT_INTERFACE,
 106   RID_AT_IMPLEMENTATION,
 107
 108   RID_MAX,
 109
 110   RID_FIRST_MODIFIER = RID_STATIC,
 111   RID_LAST_MODIFIER = RID_ONEWAY,
 112
 113   RID_FIRST_AT = RID_AT_ENCODE,
 114   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 115   RID_FIRST_PQ = RID_IN,
 116   RID_LAST_PQ = RID_ONEWAY
 117 };
 118
 119 #define OBJC_IS_AT_KEYWORD(rid) \
 120   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 121    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 122
 123 #define OBJC_IS_PQ_KEYWORD(rid) \
 124   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 125    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 126
 127 /* The elements of `ridpointers' are identifier nodes for the reserved
 128    type names and storage classes.  It is indexed by a RID_... value.  */
 129 extern GTY ((length ("(int)RID_MAX"))) tree *ridpointers;
 130
 131 /* Standard named or nameless data types of the C compiler.  */
 132
 133 enum c_tree_index
 134 {
 135     CTI_WCHAR_TYPE,
 136     CTI_SIGNED_WCHAR_TYPE,
 137     CTI_UNSIGNED_WCHAR_TYPE,
 138     CTI_WINT_TYPE,
 139     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 140     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 141     CTI_INTMAX_TYPE,
 142     CTI_UINTMAX_TYPE,
 143     CTI_WIDEST_INT_LIT_TYPE,
 144     CTI_WIDEST_UINT_LIT_TYPE,
 145
 146     CTI_CHAR_ARRAY_TYPE,
 147     CTI_WCHAR_ARRAY_TYPE,
 148     CTI_INT_ARRAY_TYPE,
 149     CTI_STRING_TYPE,
 150     CTI_CONST_STRING_TYPE,
 151
 152     /* Type for boolean expressions (bool in C++, int in C).  */
 153     CTI_TRUTHVALUE_TYPE,
 154     CTI_TRUTHVALUE_TRUE,
 155     CTI_TRUTHVALUE_FALSE,
 156
 157     CTI_DEFAULT_FUNCTION_TYPE,
 158
 159     CTI_G77_INTEGER_TYPE,
 160     CTI_G77_UINTEGER_TYPE,
 161     CTI_G77_LONGINT_TYPE,
 162     CTI_G77_ULONGINT_TYPE,
 163
 164     /* These are not types, but we have to look them up all the time.  */
 165     CTI_FUNCTION_NAME_DECL,
 166     CTI_PRETTY_FUNCTION_NAME_DECL,
 167     CTI_C99_FUNCTION_NAME_DECL,
 168     CTI_SAVED_FUNCTION_NAME_DECLS,
 169
 170     CTI_VOID_ZERO,
 171
 172     CTI_MAX
 173 };
 174
 175 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 176
 177 /* Identifier part common to the C front ends.  Inherits from
 178    tree_identifier, despite appearances.  */
 179 struct c_common_identifier GTY(())
 180 {
 181   struct tree_common common;
 182   struct cpp_hashnode node;
 183 };
 184
 185 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 186 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 187 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 188 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 189 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 190 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 191 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 192 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 193 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 194 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 195
 196 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 197 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 198 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 199
 200 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 201 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 202 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 203 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 204 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 205
 206 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 207
 208 /* g77 integer types, which which must be kept in sync with f/com.h */
 209 #define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
 210 #define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
 211 #define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
 212 #define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
 213
 214 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 215 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 216 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 217 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 218
 219 /* A node for `((void) 0)'.  */
 220 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 221
 222 extern GTY(()) tree c_global_trees[CTI_MAX];
 223
 224 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a tree for size reasons.  */
 225 struct sorted_fields_type GTY(())
 226 {
 227   int len;
 228   tree GTY((length ("%h.len"))) elts[1];
 229 };
 230
 231 /* Mark which labels are explicitly declared.
 232    These may be shadowed, and may be referenced from nested functions.  */
 233 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 234
 235 /* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
 236    warning if they undergo concatenation.  */
 237 #define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
 238
 239 typedef enum c_language_kind
 240 {
 241   clk_c         = 0,            /* C90, C94 or C99 */
 242   clk_objc      = 1,            /* clk_c with ObjC features.  */
 243   clk_cxx       = 2,            /* ANSI/ISO C++ */
 244   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 245 }
 246 c_language_kind;
 247
 248 /* To test for a specific language use c_language, defined by each
 249    front end.  For "ObjC features" or "not C++" use the macros.  */
 250 extern c_language_kind c_language;
 251
 252 #define c_dialect_cxx()         (c_language & clk_cxx)
 253 #define c_dialect_objc()        (c_language & clk_objc)
 254
 255 /* Information about a statement tree.  */
 256
 257 struct stmt_tree_s GTY(()) {
 258   /* The last statement added to the tree.  */
 259   tree x_last_stmt;
 260   /* The type of the last expression statement.  (This information is
 261      needed to implement the statement-expression extension.)  */
 262   tree x_last_expr_type;
 263   /* The last filename we recorded.  */
 264   const char *x_last_expr_filename;
 265   /* In C++, Nonzero if we should treat statements as full
 266      expressions.  In particular, this variable is no-zero if at the
 267      end of a statement we should destroy any temporaries created
 268      during that statement.  Similarly, if, at the end of a block, we
 269      should destroy any local variables in this block.  Normally, this
 270      variable is nonzero, since those are the normal semantics of
 271      C++.
 272
 273      However, in order to represent aggregate initialization code as
 274      tree structure, we use statement-expressions.  The statements
 275      within the statement expression should not result in cleanups
 276      being run until the entire enclosing statement is complete.
 277
 278      This flag has no effect in C.  */
 279   int stmts_are_full_exprs_p;
 280 };
 281
 282 typedef struct stmt_tree_s *stmt_tree;
 283
 284 /* Global state pertinent to the current function.  Some C dialects
 285    extend this structure with additional fields.  */
 286
 287 struct c_language_function GTY(()) {
 288   /* While we are parsing the function, this contains information
 289      about the statement-tree that we are building.  */
 290   struct stmt_tree_s x_stmt_tree;
 291   /* The stack of SCOPE_STMTs for the current function.  */
 292   tree x_scope_stmt_stack;
 293 };
 294
 295 /* When building a statement-tree, this is the last statement added to
 296    the tree.  */
 297
 298 #define last_tree (current_stmt_tree ()->x_last_stmt)
 299
 300 /* The type of the last expression-statement we have seen.  */
 301
 302 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 303
 304 /* The name of the last file we have seen.  */
 305
 306 #define last_expr_filename (current_stmt_tree ()->x_last_expr_filename)
 307
 308 /* LAST_TREE contains the last statement parsed.  These are chained
 309    together through the TREE_CHAIN field, but often need to be
 310    re-organized since the parse is performed bottom-up.  This macro
 311    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 312
 313 #define RECHAIN_STMTS(stmt, substmt)            \
 314   do {                                          \
 315     substmt = TREE_CHAIN (stmt);                \
 316     TREE_CHAIN (stmt) = NULL_TREE;              \
 317     last_tree = stmt;                           \
 318   } while (0)
 319
 320 /* Language-specific hooks.  */
 321
 322 extern void (*lang_expand_stmt) (tree);
 323 extern void (*lang_expand_decl_stmt) (tree);
 324 extern void (*lang_expand_function_end) (void);
 325
 326 /* Callback that determines if it's ok for a function to have no
 327    noreturn attribute.  */
 328 extern int (*lang_missing_noreturn_ok_p) (tree);
 329
 330 extern int yyparse (void);
 331 extern void free_parser_stacks (void);
 332
 333 extern stmt_tree current_stmt_tree (void);
 334 extern tree *current_scope_stmt_stack (void);
 335 extern void begin_stmt_tree (tree *);
 336 extern tree add_stmt (tree);
 337 extern void add_decl_stmt (tree);
 338 extern tree add_scope_stmt (int, int);
 339 extern void finish_stmt_tree (tree *);
 340
 341 extern tree walk_stmt_tree (tree *, walk_tree_fn, void *);
 342 extern void prep_stmt (tree);
 343 extern void expand_stmt (tree);
 344 extern tree c_begin_if_stmt (void);
 345 extern tree c_begin_while_stmt (void);
 346 extern void c_finish_while_stmt_cond (tree, tree);
 347
 348 enum sw_kind { SW_PARAM = 0, SW_LOCAL, SW_GLOBAL };
 349 extern void shadow_warning (enum sw_kind, const char *, tree);
 350 extern int field_decl_cmp (const void *, const void *);
 351 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 352                                   void *);
 353 \f
 354 /* Switches common to the C front ends.  */
 355
 356 /* Nonzero if prepreprocessing only.  */
 357
 358 extern int flag_preprocess_only;
 359
 360 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 361    calls will be used in ObjC; passing nil receivers to such calls
 362    will most likely result in crashes.  */
 363 extern int flag_nil_receivers;
 364
 365 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 366    @try, etc.) in source code.  */
 367 extern int flag_objc_exceptions;
 368
 369 /* Nonzero means that code generation will be altered to support
 370    "zero-link" execution.  This currently affects ObjC only, but may
 371    affect other languages in the future.  */
 372 extern int flag_zero_link;
 373
 374 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 375    unit.  It will inform the ObjC runtime that class definition(s) herein
 376    contained are to replace one(s) previously loaded.  */
 377 extern int flag_replace_objc_classes;
 378
 379 /* Nonzero means don't output line number information.  */
 380
 381 extern char flag_no_line_commands;
 382
 383 /* Nonzero causes -E output not to be done, but directives such as
 384    #define that have side effects are still obeyed.  */
 385
 386 extern char flag_no_output;
 387
 388 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 389    'N' of the command line switch.  */
 390
 391 extern char flag_dump_macros;
 392
 393 /* Nonzero means pass #include lines through to the output.  */
 394
 395 extern char flag_dump_includes;
 396
 397 /* The file name to which we should write a precompiled header, or
 398    NULL if no header will be written in this compile.  */
 399
 400 extern const char *pch_file;
 401
 402 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 403    user's namespace.  */
 404
 405 extern int flag_iso;
 406
 407 /* Nonzero if -undef was given.  It suppresses target built-in macros
 408    and assertions.  */
 409
 410 extern int flag_undef;
 411
 412 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 413
 414 extern int flag_no_builtin;
 415
 416 /* Nonzero means don't recognize the non-ANSI builtin functions.
 417    -ansi sets this.  */
 418
 419 extern int flag_no_nonansi_builtin;
 420
 421 /* Nonzero means give `double' the same size as `float'.  */
 422
 423 extern int flag_short_double;
 424
 425 /* Nonzero means give `wchar_t' the same size as `short'.  */
 426
 427 extern int flag_short_wchar;
 428
 429 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 430 extern int flag_ms_extensions;
 431
 432 /* Nonzero means don't recognize the keyword `asm'.  */
 433
 434 extern int flag_no_asm;
 435
 436 /* Nonzero means give string constants the type `const char *', as mandated
 437    by the standard.  */
 438
 439 extern int flag_const_strings;
 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 warn when casting a function call to a type that does
 560    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 561    when there is no previous declaration of sqrt or malloc.  */
 562
 563 extern int warn_bad_function_cast;
 564
 565 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 566
 567 extern int warn_traditional;
 568
 569 /* Nonzero means warn for a declaration found after a statement.  */
 570
 571 extern int warn_declaration_after_statement;
 572
 573 /* Nonzero means warn for non-prototype function decls
 574    or non-prototyped defs without previous prototype.  */
 575
 576 extern int warn_strict_prototypes;
 577
 578 /* Nonzero means warn for any global function def
 579    without separate previous decl.  */
 580
 581 extern int warn_missing_declarations;
 582
 583 /* Nonzero means warn about extern declarations of objects not at
 584    file-scope level and about *all* declarations of functions (whether
 585    extern or static) not at file-scope level.  Note that we exclude
 586    implicit function declarations.  To get warnings about those, use
 587    -Wimplicit.  */
 588
 589 extern int warn_nested_externs;
 590
 591 /* Warn if main is suspicious.  */
 592
 593 extern int warn_main;
 594
 595 /* Nonzero means warn about possible violations of sequence point rules.  */
 596
 597 extern int warn_sequence_point;
 598
 599 /* Nonzero means warn about uninitialized variable when it is initialized with itself.
 600    For example: int i = i;, GCC will not warn about this when warn_init_self is nonzero.  */
 601
 602 extern int warn_init_self;
 603
 604
 605 /* Nonzero means to warn about compile-time division by zero.  */
 606 extern int warn_div_by_zero;
 607
 608 /* Nonzero means warn about use of implicit int.  */
 609
 610 extern int warn_implicit_int;
 611
 612 /* Warn about NULL being passed to argument slots marked as requiring
 613    non-NULL.  */
 614
 615 extern int warn_nonnull;
 616
 617 /* Warn about old-style parameter declaration.  */
 618
 619 extern int warn_old_style_definition;
 620
 621
 622 /* ObjC language option variables.  */
 623
 624
 625 /* Open and close the file for outputting class declarations, if
 626    requested (ObjC).  */
 627
 628 extern int flag_gen_declaration;
 629
 630 /* Generate code for GNU or NeXT runtime environment.  */
 631
 632 extern int flag_next_runtime;
 633
 634 /* Tells the compiler that this is a special run.  Do not perform any
 635    compiling, instead we are to test some platform dependent features
 636    and output a C header file with appropriate definitions.  */
 637
 638 extern int print_struct_values;
 639
 640 /* ???.  Undocumented.  */
 641
 642 extern const char *constant_string_class_name;
 643
 644 /* Warn if multiple methods are seen for the same selector, but with
 645    different argument types.  Performs the check on the whole selector
 646    table at the end of compilation.  */
 647
 648 extern int warn_selector;
 649
 650 /* Warn if a @selector() is found, and no method with that selector
 651    has been previously declared.  The check is done on each
 652    @selector() as soon as it is found - so it warns about forward
 653    declarations.  */
 654
 655 extern int warn_undeclared_selector;
 656
 657 /* Warn if methods required by a protocol are not implemented in the
 658    class adopting it.  When turned off, methods inherited to that
 659    class are also considered implemented.  */
 660
 661 extern int warn_protocol;
 662
 663
 664 /* C++ language option variables.  */
 665
 666
 667 /* Nonzero means don't recognize any extension keywords.  */
 668
 669 extern int flag_no_gnu_keywords;
 670
 671 /* Nonzero means do emit exported implementations of functions even if
 672    they can be inlined.  */
 673
 674 extern int flag_implement_inlines;
 675
 676 /* Nonzero means do emit exported implementations of templates, instead of
 677    multiple static copies in each file that needs a definition.  */
 678
 679 extern int flag_external_templates;
 680
 681 /* Nonzero means that the decision to emit or not emit the implementation of a
 682    template depends on where the template is instantiated, rather than where
 683    it is defined.  */
 684
 685 extern int flag_alt_external_templates;
 686
 687 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 688
 689 extern int flag_implicit_templates;
 690
 691 /* Nonzero means that implicit instantiations of inline templates will be
 692    emitted if needed, even if instantiations of non-inline templates
 693    aren't.  */
 694
 695 extern int flag_implicit_inline_templates;
 696
 697 /* Nonzero means generate separate instantiation control files and
 698    juggle them at link time.  */
 699
 700 extern int flag_use_repository;
 701
 702 /* Nonzero if we want to issue diagnostics that the standard says are not
 703    required.  */
 704
 705 extern int flag_optional_diags;
 706
 707 /* Nonzero means we should attempt to elide constructors when possible.  */
 708
 709 extern int flag_elide_constructors;
 710
 711 /* Nonzero means that member functions defined in class scope are
 712    inline by default.  */
 713
 714 extern int flag_default_inline;
 715
 716 /* Controls whether compiler generates 'type descriptor' that give
 717    run-time type information.  */
 718
 719 extern int flag_rtti;
 720
 721 /* Nonzero if we want to conserve space in the .o files.  We do this
 722    by putting uninitialized data and runtime initialized data into
 723    .common instead of .data at the expense of not flagging multiple
 724    definitions.  */
 725
 726 extern int flag_conserve_space;
 727
 728 /* Nonzero if we want to obey access control semantics.  */
 729
 730 extern int flag_access_control;
 731
 732 /* Nonzero if we want to check the return value of new and avoid calling
 733    constructors if it is a null pointer.  */
 734
 735 extern int flag_check_new;
 736
 737 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 738    initialization variables.
 739    0: Old rules, set by -fno-for-scope.
 740    2: New ISO rules, set by -ffor-scope.
 741    1: Try to implement new ISO rules, but with backup compatibility
 742    (and warnings).  This is the default, for now.  */
 743
 744 extern int flag_new_for_scope;
 745
 746 /* Nonzero if we want to emit defined symbols with common-like linkage as
 747    weak symbols where possible, in order to conform to C++ semantics.
 748    Otherwise, emit them as local symbols.  */
 749
 750 extern int flag_weak;
 751
 752 /* 0 means we want the preprocessor to not emit line directives for
 753    the current working directory.  1 means we want it to do it.  -1
 754    means we should decide depending on whether debugging information
 755    is being emitted or not.  */
 756
 757 extern int flag_working_directory;
 758
 759 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 760    destructors for local statics and global objects.  */
 761
 762 extern int flag_use_cxa_atexit;
 763
 764 /* Nonzero means make the default pedwarns warnings instead of errors.
 765    The value of this flag is ignored if -pedantic is specified.  */
 766
 767 extern int flag_permissive;
 768
 769 /* Nonzero means to implement standard semantics for exception
 770    specifications, calling unexpected if an exception is thrown that
 771    doesn't match the specification.  Zero means to treat them as
 772    assertions and optimize accordingly, but not check them.  */
 773
 774 extern int flag_enforce_eh_specs;
 775
 776 /*  The version of the C++ ABI in use.  The following values are
 777     allowed:
 778
 779     0: The version of the ABI believed most conformant with the
 780        C++ ABI specification.  This ABI may change as bugs are
 781        discovered and fixed.  Therefore, 0 will not necessarily
 782        indicate the same ABI in different versions of G++.
 783
 784     1: The version of the ABI first used in G++ 3.2.
 785
 786     Additional positive integers will be assigned as new versions of
 787     the ABI become the default version of the ABI.  */
 788
 789 extern int flag_abi_version;
 790
 791 /* Nonzero means warn about things that will change when compiling
 792    with an ABI-compliant compiler.  */
 793
 794 extern int warn_abi;
 795
 796 /* Nonzero means warn about invalid uses of offsetof.  */
 797
 798 extern int warn_invalid_offsetof;
 799
 800 /* Nonzero means warn about implicit declarations.  */
 801
 802 extern int warn_implicit;
 803
 804 /* Nonzero means warn when all ctors or dtors are private, and the class
 805    has no friends.  */
 806
 807 extern int warn_ctor_dtor_privacy;
 808
 809 /* Nonzero means warn in function declared in derived class has the
 810    same name as a virtual in the base class, but fails to match the
 811    type signature of any virtual function in the base class.  */
 812
 813 extern int warn_overloaded_virtual;
 814
 815 /* Nonzero means warn when declaring a class that has a non virtual
 816    destructor, when it really ought to have a virtual one.  */
 817
 818 extern int warn_nonvdtor;
 819
 820 /* Nonzero means warn when the compiler will reorder code.  */
 821
 822 extern int warn_reorder;
 823
 824 /* Nonzero means warn when synthesis behavior differs from Cfront's.  */
 825
 826 extern int warn_synth;
 827
 828 /* Nonzero means warn when we convert a pointer to member function
 829    into a pointer to (void or function).  */
 830
 831 extern int warn_pmf2ptr;
 832
 833 /* Nonzero means warn about violation of some Effective C++ style rules.  */
 834
 835 extern int warn_ecpp;
 836
 837 /* Nonzero means warn where overload resolution chooses a promotion from
 838    unsigned to signed over a conversion to an unsigned of the same size.  */
 839
 840 extern int warn_sign_promo;
 841
 842 /* Nonzero means warn when an old-style cast is used.  */
 843
 844 extern int warn_old_style_cast;
 845
 846 /* Nonzero means warn when non-templatized friend functions are
 847    declared within a template */
 848
 849 extern int warn_nontemplate_friend;
 850
 851 /* Nonzero means complain about deprecated features.  */
 852
 853 extern int warn_deprecated;
 854
 855 /* Maximum template instantiation depth.  This limit is rather
 856    arbitrary, but it exists to limit the time it takes to notice
 857    infinite template instantiations.  */
 858
 859 extern int max_tinst_depth;
 860
 861 /* Nonzero means the expression being parsed will never be evaluated.
 862    This is a count, since unevaluated expressions can nest.  */
 863
 864 extern int skip_evaluation;
 865
 866 /* C types are partitioned into three subsets: object, function, and
 867    incomplete types.  */
 868 #define C_TYPE_OBJECT_P(type) \
 869   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 870
 871 #define C_TYPE_INCOMPLETE_P(type) \
 872   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 873
 874 #define C_TYPE_FUNCTION_P(type) \
 875   (TREE_CODE (type) == FUNCTION_TYPE)
 876
 877 /* For convenience we define a single macro to identify the class of
 878    object or incomplete types.  */
 879 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 880   (!C_TYPE_FUNCTION_P (type))
 881
 882 /* Record in each node resulting from a binary operator
 883    what operator was specified for it.  */
 884 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 885
 886 /* Attribute table common to the C front ends.  */
 887 extern const struct attribute_spec c_common_attribute_table[];
 888 extern const struct attribute_spec c_common_format_attribute_table[];
 889
 890 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 891    ID is the identifier to use, NAME is the string.
 892    TYPE_DEP indicates whether it depends on type of the function or not
 893    (i.e. __PRETTY_FUNCTION__).  */
 894
 895 extern tree (*make_fname_decl) (tree, int);
 896
 897 extern tree identifier_global_value (tree);
 898 extern void record_builtin_type (enum rid, const char *, tree);
 899 extern tree build_void_list_node (void);
 900 extern void start_fname_decls (void);
 901 extern void finish_fname_decls (void);
 902 extern const char *fname_as_string (int);
 903 extern tree fname_decl (unsigned, tree);
 904
 905 extern void check_function_arguments (tree, tree);
 906 extern void check_function_arguments_recurse (void (*)
 907                                               (void *, tree,
 908                                                unsigned HOST_WIDE_INT),
 909                                               void *, tree,
 910                                               unsigned HOST_WIDE_INT);
 911 extern void check_function_format (int *, tree, tree);
 912 extern void set_Wformat (int);
 913 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 914 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 915 extern int c_common_handle_option (size_t code, const char *arg, int value);
 916 extern bool c_common_missing_argument (const char *opt, size_t code);
 917 extern tree c_common_type_for_mode (enum machine_mode, int);
 918 extern tree c_common_type_for_size (unsigned int, int);
 919 extern tree c_common_unsigned_type (tree);
 920 extern tree c_common_signed_type (tree);
 921 extern tree c_common_signed_or_unsigned_type (int, tree);
 922 extern tree c_common_truthvalue_conversion (tree);
 923 extern void c_apply_type_quals_to_decl (int, tree);
 924 extern tree c_sizeof_or_alignof_type (tree, enum tree_code, int);
 925 extern tree c_alignof_expr (tree);
 926 /* Print an error message for invalid operands to arith operation CODE.
 927    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 928 extern void binary_op_error (enum tree_code);
 929 #define my_friendly_assert(EXP, N) (void) \
 930  (((EXP) == 0) ? (fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0) : 0)
 931
 932 extern tree c_expand_expr_stmt (tree);
 933 extern void c_expand_start_cond (tree, int, tree);
 934 extern void c_finish_then (void);
 935 extern void c_expand_start_else (void);
 936 extern void c_finish_else (void);
 937 extern void c_expand_end_cond (void);
 938 /* Validate the expression after `case' and apply default promotions.  */
 939 extern tree check_case_value (tree);
 940 extern tree fix_string_type (tree);
 941 struct varray_head_tag;
 942 extern void constant_expression_warning (tree);
 943 extern tree convert_and_check (tree, tree);
 944 extern void overflow_warning (tree);
 945 extern void unsigned_conversion_warning (tree, tree);
 946
 947 /* Read the rest of the current #-directive line.  */
 948 extern char *get_directive_line (void);
 949 #define GET_DIRECTIVE_LINE() get_directive_line ()
 950 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 1)
 951 #define c_alignof(T) c_sizeof_or_alignof_type (T, ALIGNOF_EXPR, 1)
 952
 953 /* Subroutine of build_binary_op, used for comparison operations.
 954    See if the operands have both been converted from subword integer types
 955    and, if so, perhaps change them both back to their original type.  */
 956 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 957
 958 extern tree pointer_int_sum (enum tree_code, tree, tree);
 959 extern unsigned int min_precision (tree, int);
 960
 961 /* Add qualifiers to a type, in the fashion for C.  */
 962 extern tree c_build_qualified_type (tree, int);
 963
 964 /* Build tree nodes and builtin functions common to both C and C++ language
 965    frontends.  */
 966 extern void c_common_nodes_and_builtins (void);
 967
 968 extern void disable_builtin_function (const char *);
 969
 970 extern tree build_va_arg (tree, tree);
 971
 972 extern unsigned int c_common_init_options (unsigned int, const char **);
 973 extern bool c_common_post_options (const char **);
 974 extern bool c_common_init (void);
 975 extern void c_common_finish (void);
 976 extern void c_common_parse_file (int);
 977 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 978 extern void c_register_builtin_type (tree, const char*);
 979 extern bool c_promoting_integer_type_p (tree);
 980 extern int self_promoting_args_p (tree);
 981 extern tree strip_array_types (tree);
 982 extern tree strip_pointer_operator (tree);
 983
 984 /* This function resets the parsers' state in preparation for parsing
 985    a new file.  */
 986 extern void c_reset_state (void);
 987 /* This is the basic parsing function.  */
 988 extern void c_parse_file (void);
 989 /* This is misnamed, it actually performs end-of-compilation processing.  */
 990 extern void finish_file (void);
 991
 992 /* These macros provide convenient access to the various _STMT nodes.  */
 993
 994 /* Nonzero if this statement should be considered a full-expression,
 995    i.e., if temporaries created during this statement should have
 996    their destructors run at the end of this statement.  (In C, this
 997    will always be false, since there are no destructors.)  */
 998 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 999
1000 /* IF_STMT accessors. These give access to the condition of the if
1001    statement, the then block of the if statement, and the else block
1002    of the if statement if it exists.  */
1003 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
1004 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
1005 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
1006
1007 /* WHILE_STMT accessors. These give access to the condition of the
1008    while statement and the body of the while statement, respectively.  */
1009 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
1010 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
1011
1012 /* DO_STMT accessors. These give access to the condition of the do
1013    statement and the body of the do statement, respectively.  */
1014 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
1015 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
1016
1017 /* RETURN_STMT accessors. These give the expression associated with a
1018    return statement, and whether it should be ignored when expanding
1019    (as opposed to inlining).  */
1020 #define RETURN_STMT_EXPR(NODE)  TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
1021
1022 /* EXPR_STMT accessor. This gives the expression associated with an
1023    expression statement.  */
1024 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
1025
1026 /* FOR_STMT accessors. These give access to the init statement,
1027    condition, update expression, and body of the for statement,
1028    respectively.  */
1029 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
1030 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
1031 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
1032 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
1033
1034 /* SWITCH_STMT accessors. These give access to the condition, body and
1035    original condition type (before any compiler conversions)
1036    of the switch statement, respectively.  */
1037 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
1038 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
1039 #define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
1040
1041 /* CASE_LABEL accessors. These give access to the high and low values
1042    of a case label, respectively.  */
1043 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
1044 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
1045 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
1046
1047 /* GOTO_STMT accessor. This gives access to the label associated with
1048    a goto statement.  */
1049 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
1050 /* True for goto created artificially by the compiler.  */
1051 #define GOTO_FAKE_P(NODE)       (TREE_LANG_FLAG_0 (GOTO_STMT_CHECK (NODE)))
1052
1053 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
1054    statements associated with a compound statement. The result is the
1055    first statement in the list. Succeeding nodes can be accessed by
1056    calling TREE_CHAIN on a node in the list.  */
1057 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
1058
1059 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
1060    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
1061    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
1062    statement.  */
1063 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
1064 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
1065 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
1066 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
1067 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
1068
1069 /* DECL_STMT accessor. This gives access to the DECL associated with
1070    the given declaration statement.  */
1071 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
1072
1073 /* STMT_EXPR accessor.  */
1074 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
1075
1076 /* Nonzero if this statement-expression does not have an associated scope.  */
1077 #define STMT_EXPR_NO_SCOPE(NODE) \
1078    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
1079
1080 /* Nonzero if this statement-expression should cause warning if its result
1081    is not used.  */
1082 #define STMT_EXPR_WARN_UNUSED_RESULT(NODE) \
1083    TREE_LANG_FLAG_3 (STMT_EXPR_CHECK (NODE))
1084
1085 /* LABEL_STMT accessor. This gives access to the label associated with
1086    the given label statement.  */
1087 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
1088
1089 /* COMPOUND_LITERAL_EXPR accessors.  */
1090 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
1091   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
1092 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
1093   DECL_STMT_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
1094
1095 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
1096 #define SCOPE_BEGIN_P(NODE) \
1097   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
1098
1099 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
1100 #define SCOPE_END_P(NODE) \
1101   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
1102
1103 /* The BLOCK containing the declarations contained in this scope.  */
1104 #define SCOPE_STMT_BLOCK(NODE) \
1105   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
1106
1107 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
1108 #define SCOPE_NULLIFIED_P(NODE) \
1109   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
1110
1111 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
1112    which should be treated as non-existent from the point of view of
1113    running cleanup actions.  */
1114 #define SCOPE_NO_CLEANUPS_P(NODE) \
1115   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
1116
1117 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
1118    For example, in:
1119
1120      S s;
1121      l:
1122      S s2;
1123      goto l;
1124
1125    there is (implicitly) a new scope after `l', even though there are
1126    no curly braces.  In particular, when we hit the goto, we must
1127    destroy s2 and then re-construct it.  For the implicit scope,
1128    SCOPE_PARTIAL_P will be set.  */
1129 #define SCOPE_PARTIAL_P(NODE) \
1130   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
1131
1132 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
1133 #define ASM_VOLATILE_P(NODE)                    \
1134   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
1135
1136 /* The VAR_DECL to clean up in a CLEANUP_STMT.  */
1137 #define CLEANUP_DECL(NODE) \
1138   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
1139 /* The cleanup to run in a CLEANUP_STMT.  */
1140 #define CLEANUP_EXPR(NODE) \
1141   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
1142
1143 /* The filename we are changing to as of this FILE_STMT.  */
1144 #define FILE_STMT_FILENAME_NODE(NODE) \
1145   (TREE_OPERAND (FILE_STMT_CHECK (NODE), 0))
1146 #define FILE_STMT_FILENAME(NODE) \
1147   (IDENTIFIER_POINTER (FILE_STMT_FILENAME_NODE (NODE)))
1148
1149 /* The line-number at which a statement began.  But if
1150    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
1151    line number for the end of the current function instead.  */
1152 #define STMT_LINENO(NODE)                       \
1153   (TREE_COMPLEXITY ((NODE)))
1154
1155 /* If nonzero, the STMT_LINENO for NODE is the line at which the
1156    function ended.  */
1157 #define STMT_LINENO_FOR_FN_P(NODE)              \
1158   (TREE_LANG_FLAG_2 ((NODE)))
1159
1160 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
1161    initialization variables.  */
1162 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
1163
1164 /* Nonzero if we want to create an ASM_INPUT instead of an
1165    ASM_OPERAND with no operands.  */
1166 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
1167
1168 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
1169
1170 enum c_tree_code {
1171   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
1172 #include "c-common.def"
1173   LAST_C_TREE_CODE
1174 };
1175
1176 #undef DEFTREECODE
1177
1178 #define c_common_stmt_codes                             \
1179    CLEANUP_STMT,        EXPR_STMT,      COMPOUND_STMT,  \
1180    DECL_STMT,           IF_STMT,        FOR_STMT,       \
1181    WHILE_STMT,          DO_STMT,        RETURN_STMT,    \
1182    BREAK_STMT,          CONTINUE_STMT,  SCOPE_STMT,     \
1183    SWITCH_STMT,         GOTO_STMT,      LABEL_STMT,     \
1184    ASM_STMT,            FILE_STMT,      CASE_LABEL
1185
1186 /* TRUE if a code represents a statement.  The front end init
1187    langhook should take care of initialization of this array.  */
1188 extern bool statement_code_p[MAX_TREE_CODES];
1189
1190 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
1191
1192 #define INIT_STATEMENT_CODES(STMT_CODES)                        \
1193   do {                                                          \
1194     unsigned int i;                                             \
1195     memset (&statement_code_p, 0, sizeof (statement_code_p));   \
1196     for (i = 0; i < ARRAY_SIZE (STMT_CODES); i++)               \
1197       statement_code_p[STMT_CODES[i]] = true;                   \
1198   } while (0)
1199
1200 extern void genrtl_do_pushlevel (void);
1201 extern void genrtl_goto_stmt (tree);
1202 extern void genrtl_expr_stmt (tree);
1203 extern void genrtl_expr_stmt_value (tree, int, int);
1204 extern void genrtl_decl_stmt (tree);
1205 extern void genrtl_if_stmt (tree);
1206 extern void genrtl_while_stmt (tree);
1207 extern void genrtl_do_stmt (tree);
1208 extern void genrtl_return_stmt (tree);
1209 extern void genrtl_for_stmt (tree);
1210 extern void genrtl_break_stmt (void);
1211 extern void genrtl_continue_stmt (void);
1212 extern void genrtl_scope_stmt (tree);
1213 extern void genrtl_switch_stmt (tree);
1214 extern void genrtl_case_label (tree);
1215 extern void genrtl_compound_stmt (tree);
1216 extern void genrtl_asm_stmt (tree, tree, tree, tree, tree, int);
1217 extern void genrtl_cleanup_stmt (tree);
1218 extern int stmts_are_full_exprs_p (void);
1219 extern int anon_aggr_type_p (tree);
1220
1221 /* For a VAR_DECL that is an anonymous union, these are the various
1222    sub-variables that make up the anonymous union.  */
1223 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
1224
1225 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
1226 #define DECL_C_BIT_FIELD(NODE) \
1227   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
1228 #define SET_DECL_C_BIT_FIELD(NODE) \
1229   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
1230 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
1231   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
1232
1233 /* In a VAR_DECL, nonzero if the decl is a register variable with
1234    an explicit asm specification.  */
1235 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
1236
1237 extern void emit_local_var (tree);
1238 extern void make_rtl_for_local_static (tree);
1239 extern tree expand_cond (tree);
1240 extern tree c_expand_return (tree);
1241 extern tree do_case (tree, tree);
1242 extern tree build_stmt (enum tree_code, ...);
1243 extern tree build_case_label (tree, tree, tree);
1244 extern tree build_continue_stmt (void);
1245 extern tree build_break_stmt (void);
1246 extern tree build_return_stmt (tree);
1247
1248 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
1249
1250 /* Used by the C++ frontend to mark the block around the member
1251    initializers and cleanups.  */
1252 #define COMPOUND_STMT_BODY_BLOCK(NODE)  TREE_LANG_FLAG_3 (NODE)
1253
1254 extern void c_expand_asm_operands (tree, tree, tree, tree, int, location_t);
1255
1256 /* These functions must be defined by each front-end which implements
1257    a variant of the C language.  They are used in c-common.c.  */
1258
1259 extern tree build_unary_op (enum tree_code, tree, int);
1260 extern tree build_binary_op (enum tree_code, tree, tree, int);
1261 extern int lvalue_p (tree);
1262 extern tree default_conversion (tree);
1263
1264 /* Given two integer or real types, return the type for their sum.
1265    Given two compatible ANSI C types, returns the merged type.  */
1266
1267 extern tree common_type (tree, tree);
1268
1269 extern tree expand_tree_builtin (tree, tree, tree);
1270
1271 extern tree decl_constant_value (tree);
1272
1273 /* Handle increment and decrement of boolean types.  */
1274 extern tree boolean_increment (enum tree_code, tree);
1275
1276 /* Hook currently used only by the C++ front end to reset internal state
1277    after entering or leaving a header file.  */
1278 extern void extract_interface_info (void);
1279
1280 extern int case_compare (splay_tree_key, splay_tree_key);
1281
1282 extern tree c_add_case_label (splay_tree, tree, tree, tree);
1283
1284 extern tree build_function_call (tree, tree);
1285
1286 extern tree finish_label_address_expr (tree);
1287
1288 /* Same function prototype, but the C and C++ front ends have
1289    different implementations.  Used in c-common.c.  */
1290 extern tree lookup_label (tree);
1291
1292 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int);
1293
1294 extern int c_safe_from_p (rtx, tree);
1295
1296 extern int c_staticp (tree);
1297
1298 extern int c_common_unsafe_for_reeval (tree);
1299
1300 extern void init_c_lex (void);
1301
1302 extern void c_cpp_builtins (cpp_reader *);
1303
1304 /* Positive if an implicit `extern "C"' scope has just been entered;
1305    negative if such a scope has just been exited.  */
1306 extern int pending_lang_change;
1307
1308 /* Information recorded about each file examined during compilation.  */
1309
1310 struct c_fileinfo
1311 {
1312   int time;     /* Time spent in the file.  */
1313   short interface_only;         /* Flags - used only by C++ */
1314   short interface_unknown;
1315 };
1316
1317 struct c_fileinfo *get_fileinfo (const char *);
1318 extern void dump_time_statistics (void);
1319
1320 extern bool c_dump_tree (void *, tree);
1321
1322 extern void pch_init (void);
1323 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1324 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1325                                const char *orig);
1326 extern void c_common_write_pch (void);
1327 extern void c_common_no_more_pch (void);
1328 extern void builtin_define_with_value (const char *, const char *, int);
1329 extern void c_stddef_cpp_builtins (void);
1330 extern void fe_file_change (const struct line_map *);
1331 extern int c_estimate_num_insns (tree decl);
1332 extern bool c_decl_uninit (tree t);
1333
1334 /* The following have been moved here from c-tree.h, since they're needed
1335    in the ObjC++ world, too.  What is more, stub-objc.c could use a few
1336    prototypes.  */
1337 extern tree lookup_interface (tree);
1338 extern tree is_class_name (tree);
1339 extern tree objc_is_object_ptr (tree);
1340 extern void objc_check_decl (tree);
1341 extern int objc_comptypes (tree, tree, int);
1342 extern tree objc_message_selector (void);
1343 extern tree lookup_objc_ivar (tree);
1344 extern void *get_current_scope (void);
1345 extern void objc_mark_locals_volatile (void *);
1346
1347 /* In c-ppoutput.c  */
1348 extern void init_pp_output (FILE *);
1349 extern void preprocess_file (cpp_reader *);
1350 extern void pp_file_change (const struct line_map *);
1351
1352 #endif /* ! GCC_C_COMMON_H */