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: TREE_NEGATED_INT (in INTEGER_CST).
  31       IDENTIFIER_MARKED (used by search routines).
  32       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  33       STMT_EXPR_NO_SCOPE (in STMT_EXPR)
  34    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  35       STMT_IS_FULL_EXPR_P (in _STMT)
  36       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  37    2: unused
  38    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  39    4: unused
  40 */
  41
  42 /* Reserved identifiers.  This is the union of all the keywords for C,
  43    C++, and Objective-C.  All the type modifiers have to be in one
  44    block at the beginning, because they are used as mask bits.  There
  45    are 27 type modifiers; if we add many more we will have to redesign
  46    the mask mechanism.  */
  47
  48 enum rid
  49 {
  50   /* Modifiers: */
  51   /* C, in empirical order of frequency.  */
  52   RID_STATIC = 0,
  53   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  54   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  55   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  56
  57   /* C extensions */
  58   RID_COMPLEX, RID_THREAD,
  59
  60   /* C++ */
  61   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  62
  63   /* ObjC */
  64   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  65
  66   /* C */
  67   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  68   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  69   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  70   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  71   RID_SIZEOF,
  72
  73   /* C extensions */
  74   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  75   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_PTRBASE,
  76   RID_PTREXTENT, RID_PTRVALUE, RID_CHOOSE_EXPR, RID_TYPES_COMPATIBLE_P,
  77
  78   /* Too many ways of getting the name of a function as a string */
  79   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  80
  81   /* C++ */
  82   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  83   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  84   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  85   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  86   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  87   RID_THIS,     RID_THROW,    RID_TRUE,
  88   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  89   RID_USING,
  90
  91   /* casts */
  92   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  93
  94   /* Objective-C */
  95   RID_ID,          RID_AT_ENCODE,    RID_AT_END,
  96   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
  97   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
  98   RID_AT_PROTOCOL, RID_AT_SELECTOR,
  99   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 100   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 101   RID_AT_INTERFACE,
 102   RID_AT_IMPLEMENTATION,
 103
 104   RID_MAX,
 105
 106   RID_FIRST_MODIFIER = RID_STATIC,
 107   RID_LAST_MODIFIER = RID_ONEWAY,
 108
 109   RID_FIRST_AT = RID_AT_ENCODE,
 110   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 111   RID_FIRST_PQ = RID_IN,
 112   RID_LAST_PQ = RID_ONEWAY
 113 };
 114
 115 #define OBJC_IS_AT_KEYWORD(rid) \
 116   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 117    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 118
 119 #define OBJC_IS_PQ_KEYWORD(rid) \
 120   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 121    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 122
 123 /* The elements of `ridpointers' are identifier nodes for the reserved
 124    type names and storage classes.  It is indexed by a RID_... value.  */
 125 extern GTY ((length ("(int)RID_MAX"))) tree *ridpointers;
 126
 127 /* Standard named or nameless data types of the C compiler.  */
 128
 129 enum c_tree_index
 130 {
 131     CTI_WCHAR_TYPE,
 132     CTI_SIGNED_WCHAR_TYPE,
 133     CTI_UNSIGNED_WCHAR_TYPE,
 134     CTI_WINT_TYPE,
 135     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 136     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 137     CTI_INTMAX_TYPE,
 138     CTI_UINTMAX_TYPE,
 139     CTI_WIDEST_INT_LIT_TYPE,
 140     CTI_WIDEST_UINT_LIT_TYPE,
 141
 142     CTI_CHAR_ARRAY_TYPE,
 143     CTI_WCHAR_ARRAY_TYPE,
 144     CTI_INT_ARRAY_TYPE,
 145     CTI_STRING_TYPE,
 146     CTI_CONST_STRING_TYPE,
 147
 148     /* Type for boolean expressions (bool in C++, int in C).  */
 149     CTI_TRUTHVALUE_TYPE,
 150     CTI_TRUTHVALUE_TRUE,
 151     CTI_TRUTHVALUE_FALSE,
 152
 153     CTI_DEFAULT_FUNCTION_TYPE,
 154
 155     /* These are not types, but we have to look them up all the time.  */
 156     CTI_FUNCTION_NAME_DECL,
 157     CTI_PRETTY_FUNCTION_NAME_DECL,
 158     CTI_C99_FUNCTION_NAME_DECL,
 159     CTI_SAVED_FUNCTION_NAME_DECLS,
 160
 161     CTI_VOID_ZERO,
 162
 163     CTI_MAX
 164 };
 165
 166 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 167
 168 /* Identifier part common to the C front ends.  Inherits from
 169    tree_identifier, despite appearances.  */
 170 struct c_common_identifier GTY(())
 171 {
 172   struct tree_common common;
 173   struct cpp_hashnode node;
 174 };
 175
 176 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 177 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 178 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 179 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 180 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 181 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 182 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 183 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 184 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 185 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 186
 187 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 188 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 189 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 190
 191 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 192 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 193 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 194 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 195 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 196
 197 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 198
 199 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 200 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 201 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 202 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 203
 204 /* A node for `((void) 0)'.  */
 205 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 206
 207 extern GTY(()) tree c_global_trees[CTI_MAX];
 208
 209 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 210    tree for size reasons.  */
 211 struct sorted_fields_type GTY(())
 212 {
 213   int len;
 214   tree GTY((length ("%h.len"))) elts[1];
 215 };
 216
 217 /* Mark which labels are explicitly declared.
 218    These may be shadowed, and may be referenced from nested functions.  */
 219 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 220
 221 /* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
 222    warning if they undergo concatenation.  */
 223 #define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
 224
 225 typedef enum c_language_kind
 226 {
 227   clk_c         = 0,            /* C90, C94 or C99 */
 228   clk_objc      = 1,            /* clk_c with ObjC features.  */
 229   clk_cxx       = 2,            /* ANSI/ISO C++ */
 230   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 231 }
 232 c_language_kind;
 233
 234 /* To test for a specific language use c_language, defined by each
 235    front end.  For "ObjC features" or "not C++" use the macros.  */
 236 extern c_language_kind c_language;
 237
 238 #define c_dialect_cxx()         (c_language & clk_cxx)
 239 #define c_dialect_objc()        (c_language & clk_objc)
 240
 241 /* Information about a statement tree.  */
 242
 243 struct stmt_tree_s GTY(()) {
 244   /* The current statment list being collected.  */
 245   tree x_cur_stmt_list;
 246
 247   /* In C++, Nonzero if we should treat statements as full
 248      expressions.  In particular, this variable is no-zero if at the
 249      end of a statement we should destroy any temporaries created
 250      during that statement.  Similarly, if, at the end of a block, we
 251      should destroy any local variables in this block.  Normally, this
 252      variable is nonzero, since those are the normal semantics of
 253      C++.
 254
 255      However, in order to represent aggregate initialization code as
 256      tree structure, we use statement-expressions.  The statements
 257      within the statement expression should not result in cleanups
 258      being run until the entire enclosing statement is complete.
 259
 260      This flag has no effect in C.  */
 261   int stmts_are_full_exprs_p;
 262 };
 263
 264 typedef struct stmt_tree_s *stmt_tree;
 265
 266 /* Global state pertinent to the current function.  Some C dialects
 267    extend this structure with additional fields.  */
 268
 269 struct c_language_function GTY(()) {
 270   /* While we are parsing the function, this contains information
 271      about the statement-tree that we are building.  */
 272   struct stmt_tree_s x_stmt_tree;
 273 };
 274
 275 /* When building a statement-tree, this is the current statment list
 276    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 277    statment list.  */
 278
 279 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 280
 281 /* Language-specific hooks.  */
 282
 283 extern void (*lang_expand_function_end) (void);
 284
 285 /* Callback that determines if it's ok for a function to have no
 286    noreturn attribute.  */
 287 extern int (*lang_missing_noreturn_ok_p) (tree);
 288
 289 /* If non-NULL, this function is called after a precompile header file
 290    is loaded.  */
 291 extern void (*lang_post_pch_load) (void);
 292
 293 extern void push_file_scope (void);
 294 extern void pop_file_scope (void);
 295 extern int yyparse (void);
 296 extern stmt_tree current_stmt_tree (void);
 297 extern tree push_stmt_list (void);
 298 extern tree re_push_stmt_list (tree);
 299 extern tree pop_stmt_list (tree);
 300 extern tree add_stmt (tree);
 301 extern void push_cleanup (tree, tree, bool);
 302
 303 extern tree walk_stmt_tree (tree *, walk_tree_fn, void *);
 304 extern int c_expand_decl (tree);
 305
 306 extern int field_decl_cmp (const void *, const void *);
 307 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 308                                   void *);
 309 extern bool has_c_linkage (tree decl);
 310 \f
 311 /* Switches common to the C front ends.  */
 312
 313 /* Nonzero if prepreprocessing only.  */
 314
 315 extern int flag_preprocess_only;
 316
 317 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 318    calls will be used in ObjC; passing nil receivers to such calls
 319    will most likely result in crashes.  */
 320 extern int flag_nil_receivers;
 321
 322 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 323    @try, etc.) in source code.  */
 324 extern int flag_objc_exceptions;
 325
 326 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 327 extern int flag_objc_sjlj_exceptions;
 328
 329 /* Nonzero means that code generation will be altered to support
 330    "zero-link" execution.  This currently affects ObjC only, but may
 331    affect other languages in the future.  */
 332 extern int flag_zero_link;
 333
 334 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 335    unit.  It will inform the ObjC runtime that class definition(s) herein
 336    contained are to replace one(s) previously loaded.  */
 337 extern int flag_replace_objc_classes;
 338
 339 /* Nonzero means don't output line number information.  */
 340
 341 extern char flag_no_line_commands;
 342
 343 /* Nonzero causes -E output not to be done, but directives such as
 344    #define that have side effects are still obeyed.  */
 345
 346 extern char flag_no_output;
 347
 348 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 349    'N' of the command line switch.  */
 350
 351 extern char flag_dump_macros;
 352
 353 /* Nonzero means pass #include lines through to the output.  */
 354
 355 extern char flag_dump_includes;
 356
 357 /* Nonzero means process PCH files while preprocessing.  */
 358
 359 extern bool flag_pch_preprocess;
 360
 361 /* The file name to which we should write a precompiled header, or
 362    NULL if no header will be written in this compile.  */
 363
 364 extern const char *pch_file;
 365
 366 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 367    user's namespace.  */
 368
 369 extern int flag_iso;
 370
 371 /* Nonzero if -undef was given.  It suppresses target built-in macros
 372    and assertions.  */
 373
 374 extern int flag_undef;
 375
 376 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 377
 378 extern int flag_no_builtin;
 379
 380 /* Nonzero means don't recognize the non-ANSI builtin functions.
 381    -ansi sets this.  */
 382
 383 extern int flag_no_nonansi_builtin;
 384
 385 /* Nonzero means give `double' the same size as `float'.  */
 386
 387 extern int flag_short_double;
 388
 389 /* Nonzero means give `wchar_t' the same size as `short'.  */
 390
 391 extern int flag_short_wchar;
 392
 393 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 394 extern int flag_ms_extensions;
 395
 396 /* Nonzero means don't recognize the keyword `asm'.  */
 397
 398 extern int flag_no_asm;
 399
 400 /* Nonzero means give string constants the type `const char *', as mandated
 401    by the standard.  */
 402
 403 extern int flag_const_strings;
 404
 405 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 406
 407 extern int flag_signed_bitfields;
 408 extern int explicit_flag_signed_bitfields;
 409
 410 /* Nonzero means warn about deprecated conversion from string constant to
 411    `char *'.  */
 412
 413 extern int warn_write_strings;
 414
 415 /* Warn about #pragma directives that are not recognized.  */
 416
 417 extern int warn_unknown_pragmas; /* Tri state variable.  */
 418
 419 /* Warn about format/argument anomalies in calls to formatted I/O functions
 420    (*printf, *scanf, strftime, strfmon, etc.).  */
 421
 422 extern int warn_format;
 423
 424
 425 /* C/ObjC language option variables.  */
 426
 427
 428 /* Nonzero means allow type mismatches in conditional expressions;
 429    just make their values `void'.  */
 430
 431 extern int flag_cond_mismatch;
 432
 433 /* Nonzero means enable C89 Amendment 1 features.  */
 434
 435 extern int flag_isoc94;
 436
 437 /* Nonzero means use the ISO C99 dialect of C.  */
 438
 439 extern int flag_isoc99;
 440
 441 /* Nonzero means that we have builtin functions, and main is an int.  */
 442
 443 extern int flag_hosted;
 444
 445 /* Warn if main is suspicious.  */
 446
 447 extern int warn_main;
 448
 449
 450 /* ObjC language option variables.  */
 451
 452
 453 /* Open and close the file for outputting class declarations, if
 454    requested (ObjC).  */
 455
 456 extern int flag_gen_declaration;
 457
 458 /* Generate code for GNU or NeXT runtime environment.  */
 459
 460 extern int flag_next_runtime;
 461
 462 /* Tells the compiler that this is a special run.  Do not perform any
 463    compiling, instead we are to test some platform dependent features
 464    and output a C header file with appropriate definitions.  */
 465
 466 extern int print_struct_values;
 467
 468 /* ???.  Undocumented.  */
 469
 470 extern const char *constant_string_class_name;
 471
 472
 473 /* C++ language option variables.  */
 474
 475
 476 /* Nonzero means don't recognize any extension keywords.  */
 477
 478 extern int flag_no_gnu_keywords;
 479
 480 /* Nonzero means do emit exported implementations of functions even if
 481    they can be inlined.  */
 482
 483 extern int flag_implement_inlines;
 484
 485 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 486
 487 extern int flag_implicit_templates;
 488
 489 /* Nonzero means that implicit instantiations of inline templates will be
 490    emitted if needed, even if instantiations of non-inline templates
 491    aren't.  */
 492
 493 extern int flag_implicit_inline_templates;
 494
 495 /* Nonzero means generate separate instantiation control files and
 496    juggle them at link time.  */
 497
 498 extern int flag_use_repository;
 499
 500 /* Nonzero if we want to issue diagnostics that the standard says are not
 501    required.  */
 502
 503 extern int flag_optional_diags;
 504
 505 /* Nonzero means we should attempt to elide constructors when possible.  */
 506
 507 extern int flag_elide_constructors;
 508
 509 /* Nonzero means that member functions defined in class scope are
 510    inline by default.  */
 511
 512 extern int flag_default_inline;
 513
 514 /* Controls whether compiler generates 'type descriptor' that give
 515    run-time type information.  */
 516
 517 extern int flag_rtti;
 518
 519 /* Nonzero if we want to conserve space in the .o files.  We do this
 520    by putting uninitialized data and runtime initialized data into
 521    .common instead of .data at the expense of not flagging multiple
 522    definitions.  */
 523
 524 extern int flag_conserve_space;
 525
 526 /* Nonzero if we want to obey access control semantics.  */
 527
 528 extern int flag_access_control;
 529
 530 /* Nonzero if we want to check the return value of new and avoid calling
 531    constructors if it is a null pointer.  */
 532
 533 extern int flag_check_new;
 534
 535 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 536    initialization variables.
 537    0: Old rules, set by -fno-for-scope.
 538    2: New ISO rules, set by -ffor-scope.
 539    1: Try to implement new ISO rules, but with backup compatibility
 540    (and warnings).  This is the default, for now.  */
 541
 542 extern int flag_new_for_scope;
 543
 544 /* Nonzero if we want to emit defined symbols with common-like linkage as
 545    weak symbols where possible, in order to conform to C++ semantics.
 546    Otherwise, emit them as local symbols.  */
 547
 548 extern int flag_weak;
 549
 550 /* 0 means we want the preprocessor to not emit line directives for
 551    the current working directory.  1 means we want it to do it.  -1
 552    means we should decide depending on whether debugging information
 553    is being emitted or not.  */
 554
 555 extern int flag_working_directory;
 556
 557 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 558    destructors for local statics and global objects.  */
 559
 560 extern int flag_use_cxa_atexit;
 561
 562 /* Nonzero means make the default pedwarns warnings instead of errors.
 563    The value of this flag is ignored if -pedantic is specified.  */
 564
 565 extern int flag_permissive;
 566
 567 /* Nonzero means to implement standard semantics for exception
 568    specifications, calling unexpected if an exception is thrown that
 569    doesn't match the specification.  Zero means to treat them as
 570    assertions and optimize accordingly, but not check them.  */
 571
 572 extern int flag_enforce_eh_specs;
 573
 574 /* Nonzero (the default) means to generate thread-safe code for
 575    initializing local statics.  */
 576
 577 extern int flag_threadsafe_statics;
 578
 579 /* Nonzero means warn about implicit declarations.  */
 580
 581 extern int warn_implicit;
 582
 583 /* Maximum template instantiation depth.  This limit is rather
 584    arbitrary, but it exists to limit the time it takes to notice
 585    infinite template instantiations.  */
 586
 587 extern int max_tinst_depth;
 588
 589 /* Nonzero means the expression being parsed will never be evaluated.
 590    This is a count, since unevaluated expressions can nest.  */
 591
 592 extern int skip_evaluation;
 593
 594 /* C types are partitioned into three subsets: object, function, and
 595    incomplete types.  */
 596 #define C_TYPE_OBJECT_P(type) \
 597   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 598
 599 #define C_TYPE_INCOMPLETE_P(type) \
 600   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 601
 602 #define C_TYPE_FUNCTION_P(type) \
 603   (TREE_CODE (type) == FUNCTION_TYPE)
 604
 605 /* For convenience we define a single macro to identify the class of
 606    object or incomplete types.  */
 607 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 608   (!C_TYPE_FUNCTION_P (type))
 609
 610 /* Attribute table common to the C front ends.  */
 611 extern const struct attribute_spec c_common_attribute_table[];
 612 extern const struct attribute_spec c_common_format_attribute_table[];
 613
 614 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 615    ID is the identifier to use, NAME is the string.
 616    TYPE_DEP indicates whether it depends on type of the function or not
 617    (i.e. __PRETTY_FUNCTION__).  */
 618
 619 extern tree (*make_fname_decl) (tree, int);
 620
 621 extern tree identifier_global_value (tree);
 622 extern void record_builtin_type (enum rid, const char *, tree);
 623 extern tree build_void_list_node (void);
 624 extern void start_fname_decls (void);
 625 extern void finish_fname_decls (void);
 626 extern const char *fname_as_string (int);
 627 extern tree fname_decl (unsigned, tree);
 628
 629 extern void check_function_arguments (tree, tree);
 630 extern void check_function_arguments_recurse (void (*)
 631                                               (void *, tree,
 632                                                unsigned HOST_WIDE_INT),
 633                                               void *, tree,
 634                                               unsigned HOST_WIDE_INT);
 635 extern void check_function_format (tree, tree);
 636 extern void set_Wformat (int);
 637 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 638 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 639 extern int c_common_handle_option (size_t code, const char *arg, int value);
 640 extern bool c_common_missing_argument (const char *opt, size_t code);
 641 extern tree c_common_type_for_mode (enum machine_mode, int);
 642 extern tree c_common_type_for_size (unsigned int, int);
 643 extern tree c_common_unsigned_type (tree);
 644 extern tree c_common_signed_type (tree);
 645 extern tree c_common_signed_or_unsigned_type (int, tree);
 646 extern tree c_common_truthvalue_conversion (tree);
 647 extern void c_apply_type_quals_to_decl (int, tree);
 648 extern tree c_sizeof_or_alignof_type (tree, enum tree_code, int);
 649 extern tree c_alignof_expr (tree);
 650 /* Print an error message for invalid operands to arith operation CODE.
 651    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 652 extern void binary_op_error (enum tree_code);
 653 extern tree fix_string_type (tree);
 654 struct varray_head_tag;
 655 extern void constant_expression_warning (tree);
 656 extern tree convert_and_check (tree, tree);
 657 extern void overflow_warning (tree);
 658 extern void unsigned_conversion_warning (tree, tree);
 659 extern bool c_determine_visibility (tree);
 660
 661 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 1)
 662 #define c_alignof(T) c_sizeof_or_alignof_type (T, ALIGNOF_EXPR, 1)
 663
 664 /* Subroutine of build_binary_op, used for comparison operations.
 665    See if the operands have both been converted from subword integer types
 666    and, if so, perhaps change them both back to their original type.  */
 667 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 668
 669 extern tree pointer_int_sum (enum tree_code, tree, tree);
 670 extern unsigned int min_precision (tree, int);
 671
 672 /* Add qualifiers to a type, in the fashion for C.  */
 673 extern tree c_build_qualified_type (tree, int);
 674
 675 /* Build tree nodes and builtin functions common to both C and C++ language
 676    frontends.  */
 677 extern void c_common_nodes_and_builtins (void);
 678
 679 extern void disable_builtin_function (const char *);
 680
 681 extern tree build_va_arg (tree, tree);
 682
 683 extern unsigned int c_common_init_options (unsigned int, const char **);
 684 extern bool c_common_post_options (const char **);
 685 extern bool c_common_init (void);
 686 extern void c_common_finish (void);
 687 extern void c_common_parse_file (int);
 688 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 689 extern void c_register_builtin_type (tree, const char*);
 690 extern bool c_promoting_integer_type_p (tree);
 691 extern int self_promoting_args_p (tree);
 692 extern tree strip_array_types (tree);
 693 extern tree strip_pointer_operator (tree);
 694
 695 /* This is the basic parsing function.  */
 696 extern void c_parse_file (void);
 697 /* This is misnamed, it actually performs end-of-compilation processing.  */
 698 extern void finish_file (void);
 699
 700 /* These macros provide convenient access to the various _STMT nodes.  */
 701
 702 /* Nonzero if this statement should be considered a full-expression,
 703    i.e., if temporaries created during this statement should have
 704    their destructors run at the end of this statement.  (In C, this
 705    will always be false, since there are no destructors.)  */
 706 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 707
 708 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 709    if a statement expression.  */
 710 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 711   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 712
 713 /* Nonzero if a label has been added to the statement list.  */
 714 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 715   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 716
 717 /* WHILE_STMT accessors. These give access to the condition of the
 718    while statement and the body of the while statement, respectively.  */
 719 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 720 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 721
 722 /* DO_STMT accessors. These give access to the condition of the do
 723    statement and the body of the do statement, respectively.  */
 724 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 725 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 726
 727 /* EXPR_STMT accessor. This gives the expression associated with an
 728    expression statement.  */
 729 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 730
 731 /* FOR_STMT accessors. These give access to the init statement,
 732    condition, update expression, and body of the for statement,
 733    respectively.  */
 734 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 735 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 736 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 737 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 738
 739 #define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
 740
 741 /* STMT_EXPR accessor.  */
 742 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 743
 744 /* Nonzero if this statement-expression does not have an associated scope.  */
 745 #define STMT_EXPR_NO_SCOPE(NODE) \
 746    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
 747
 748 /* COMPOUND_LITERAL_EXPR accessors.  */
 749 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 750   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 751 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 752   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 753
 754 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 755
 756 enum c_tree_code {
 757   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 758 #include "c-common.def"
 759   LAST_C_TREE_CODE
 760 };
 761
 762 #undef DEFTREECODE
 763
 764 #define c_common_stmt_codes                             \
 765    EXPR_STMT,           FOR_STMT,                       \
 766    WHILE_STMT,          DO_STMT,                        \
 767    BREAK_STMT,          CONTINUE_STMT,  SWITCH_STMT
 768
 769 /* TRUE if a code represents a statement.  The front end init
 770    langhook should take care of initialization of this array.  */
 771 extern bool statement_code_p[MAX_TREE_CODES];
 772
 773 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
 774
 775 #define INIT_STATEMENT_CODES(STMT_CODES)                        \
 776   do {                                                          \
 777     unsigned int i;                                             \
 778     memset (&statement_code_p, 0, sizeof (statement_code_p));   \
 779     for (i = 0; i < ARRAY_SIZE (STMT_CODES); i++)               \
 780       statement_code_p[STMT_CODES[i]] = true;                   \
 781   } while (0)
 782
 783 extern int stmts_are_full_exprs_p (void);
 784 extern int anon_aggr_type_p (tree);
 785
 786 /* For a VAR_DECL that is an anonymous union, these are the various
 787    sub-variables that make up the anonymous union.  */
 788 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 789
 790 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 791 #define DECL_C_BIT_FIELD(NODE) \
 792   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 793 #define SET_DECL_C_BIT_FIELD(NODE) \
 794   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 795 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 796   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 797
 798 extern void emit_local_var (tree);
 799 extern tree do_case (tree, tree);
 800 extern tree build_stmt (enum tree_code, ...);
 801 extern tree build_case_label (tree, tree, tree);
 802 extern tree build_continue_stmt (void);
 803 extern tree build_break_stmt (void);
 804
 805 /* These functions must be defined by each front-end which implements
 806    a variant of the C language.  They are used in c-common.c.  */
 807
 808 extern tree build_unary_op (enum tree_code, tree, int);
 809 extern tree build_binary_op (enum tree_code, tree, tree, int);
 810 extern int lvalue_p (tree);
 811 extern tree default_conversion (tree);
 812
 813 /* Given two integer or real types, return the type for their sum.
 814    Given two compatible ANSI C types, returns the merged type.  */
 815
 816 extern tree common_type (tree, tree);
 817
 818 extern tree decl_constant_value (tree);
 819
 820 /* Handle increment and decrement of boolean types.  */
 821 extern tree boolean_increment (enum tree_code, tree);
 822
 823 extern int case_compare (splay_tree_key, splay_tree_key);
 824
 825 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 826
 827 extern void c_do_switch_warnings (splay_tree, tree);
 828
 829 extern tree build_function_call (tree, tree);
 830
 831 extern tree finish_label_address_expr (tree);
 832
 833 /* Same function prototype, but the C and C++ front ends have
 834    different implementations.  Used in c-common.c.  */
 835 extern tree lookup_label (tree);
 836
 837 extern int vector_types_convertible_p (tree t1, tree t2);
 838
 839 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 840
 841 extern tree c_staticp (tree);
 842
 843 extern int c_common_unsafe_for_reeval (tree);
 844
 845 extern void init_c_lex (void);
 846
 847 extern void c_cpp_builtins (cpp_reader *);
 848
 849 /* Positive if an implicit `extern "C"' scope has just been entered;
 850    negative if such a scope has just been exited.  */
 851 extern GTY(()) int pending_lang_change;
 852
 853 /* Information recorded about each file examined during compilation.  */
 854
 855 struct c_fileinfo
 856 {
 857   int time;     /* Time spent in the file.  */
 858
 859   /* Flags used only by C++.
 860      INTERFACE_ONLY nonzero means that we are in an "interface" section
 861      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 862      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 863      INTERFACE_ONLY is zero, it means that we are responsible for
 864      exporting definitions that others might need.  */
 865   short interface_only;
 866   short interface_unknown;
 867 };
 868
 869 struct c_fileinfo *get_fileinfo (const char *);
 870 extern void dump_time_statistics (void);
 871
 872 extern bool c_dump_tree (void *, tree);
 873
 874 extern void c_warn_unused_result (tree *);
 875
 876 extern void verify_sequence_points (tree);
 877
 878 extern tree fold_offsetof (tree);
 879
 880 /* In c-gimplify.c  */
 881 extern void c_genericize (tree);
 882 extern int c_gimplify_expr (tree *, tree *, tree *);
 883 extern tree c_build_bind_expr (tree, tree);
 884
 885 /* In c-pch.c  */
 886 extern void pch_init (void);
 887 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 888 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 889                                const char *orig);
 890 extern void c_common_write_pch (void);
 891 extern void c_common_no_more_pch (void);
 892 extern void c_common_pch_pragma (cpp_reader *pfile);
 893
 894 extern void builtin_define_with_value (const char *, const char *, int);
 895 extern void c_stddef_cpp_builtins (void);
 896 extern void fe_file_change (const struct line_map *);
 897 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 898
 899 /* Objective-C / Objective-C++ entry points.  */
 900
 901 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 902    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 903 extern tree objc_is_class_name (tree);
 904 extern tree objc_is_object_ptr (tree);
 905 extern void objc_check_decl (tree);
 906 extern int objc_is_reserved_word (tree);
 907 extern int objc_comptypes (tree, tree, int);
 908 extern tree objc_message_selector (void);
 909 extern tree objc_lookup_ivar (tree);
 910 extern void objc_clear_super_receiver (void);
 911 extern int objc_is_public (tree, tree);
 912 extern tree objc_is_id (tree);
 913 extern void objc_declare_alias (tree, tree);
 914 extern void objc_declare_class (tree);
 915 extern void objc_declare_protocols (tree);
 916 extern tree objc_build_message_expr (tree);
 917 extern tree objc_finish_message_expr (tree, tree, tree);
 918 extern tree objc_build_selector_expr (tree);
 919 extern tree objc_build_protocol_expr (tree);
 920 extern tree objc_build_encode_expr (tree);
 921 extern tree objc_build_string_object (tree);
 922 extern tree objc_get_protocol_qualified_type (tree, tree);
 923 extern tree objc_get_class_reference (tree);
 924 extern tree objc_get_class_ivars (tree);
 925 extern void objc_start_class_interface (tree, tree, tree);
 926 extern void objc_start_category_interface (tree, tree, tree);
 927 extern void objc_start_protocol (tree, tree);
 928 extern void objc_continue_interface (void);
 929 extern void objc_finish_interface (void);
 930 extern void objc_start_class_implementation (tree, tree);
 931 extern void objc_start_category_implementation (tree, tree);
 932 extern void objc_continue_implementation (void);
 933 extern void objc_finish_implementation (void);
 934 extern void objc_set_visibility (int);
 935 extern void objc_set_method_type (enum tree_code);
 936 extern tree objc_build_method_signature (tree, tree, tree);
 937 extern void objc_add_method_declaration (tree);
 938 extern void objc_start_method_definition (tree);
 939 extern void objc_finish_method_definition (tree);
 940 extern void objc_add_instance_variable (tree);
 941 extern tree objc_build_keyword_decl (tree, tree, tree);
 942 extern tree objc_build_throw_stmt (tree);
 943 extern void objc_begin_try_stmt (location_t, tree);
 944 extern void objc_finish_try_stmt (void);
 945 extern void objc_begin_catch_clause (tree);
 946 extern void objc_finish_catch_clause (void);
 947 extern void objc_build_finally_clause (location_t, tree);
 948 extern void objc_build_synchronized (location_t, tree, tree);
 949 extern int objc_static_init_needed_p (void);
 950 extern tree objc_generate_static_init_call (tree);
 951
 952 /* The following are provided by the C and C++ front-ends, and called by
 953    ObjC/ObjC++.  */
 954 extern void *objc_get_current_scope (void);
 955 extern void objc_mark_locals_volatile (void *);
 956
 957 /* In c-ppoutput.c  */
 958 extern void init_pp_output (FILE *);
 959 extern void preprocess_file (cpp_reader *);
 960 extern void pp_file_change (const struct line_map *);
 961 extern void pp_dir_change (cpp_reader *, const char *);
 962
 963 #endif /* ! GCC_C_COMMON_H */