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, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, 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    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  34       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  35    2: unused
  36    3: STATEMENT_LIST_HAS_LABEL (in STATEMENT_LIST)
  37    4: unused
  38 */
  39
  40 /* Reserved identifiers.  This is the union of all the keywords for C,
  41    C++, and Objective-C.  All the type modifiers have to be in one
  42    block at the beginning, because they are used as mask bits.  There
  43    are 27 type modifiers; if we add many more we will have to redesign
  44    the mask mechanism.  */
  45
  46 enum rid
  47 {
  48   /* Modifiers: */
  49   /* C, in empirical order of frequency.  */
  50   RID_STATIC = 0,
  51   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  52   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  53   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  54
  55   /* C extensions */
  56   RID_COMPLEX, RID_THREAD,
  57
  58   /* C++ */
  59   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  60
  61   /* ObjC */
  62   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  63
  64   /* C */
  65   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  66   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  67   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  68   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  69   RID_SIZEOF,
  70
  71   /* C extensions */
  72   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  73   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_CHOOSE_EXPR,
  74   RID_TYPES_COMPATIBLE_P,
  75
  76   /* Too many ways of getting the name of a function as a string */
  77   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  78
  79   /* C++ */
  80   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  81   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  82   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  83   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  84   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  85   RID_THIS,     RID_THROW,    RID_TRUE,
  86   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  87   RID_USING,
  88
  89   /* casts */
  90   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  91
  92   /* Objective-C */
  93   RID_AT_ENCODE,   RID_AT_END,
  94   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
  95   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
  96   RID_AT_PROTOCOL, RID_AT_SELECTOR,
  97   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
  98   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
  99   RID_AT_INTERFACE,
 100   RID_AT_IMPLEMENTATION,
 101
 102   RID_MAX,
 103
 104   RID_FIRST_MODIFIER = RID_STATIC,
 105   RID_LAST_MODIFIER = RID_ONEWAY,
 106
 107   RID_FIRST_AT = RID_AT_ENCODE,
 108   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 109   RID_FIRST_PQ = RID_IN,
 110   RID_LAST_PQ = RID_ONEWAY
 111 };
 112
 113 #define OBJC_IS_AT_KEYWORD(rid) \
 114   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 115    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 116
 117 #define OBJC_IS_PQ_KEYWORD(rid) \
 118   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 119    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 120
 121 /* The elements of `ridpointers' are identifier nodes for the reserved
 122    type names and storage classes.  It is indexed by a RID_... value.  */
 123 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 124
 125 /* Standard named or nameless data types of the C compiler.  */
 126
 127 enum c_tree_index
 128 {
 129     CTI_WCHAR_TYPE,
 130     CTI_SIGNED_WCHAR_TYPE,
 131     CTI_UNSIGNED_WCHAR_TYPE,
 132     CTI_WINT_TYPE,
 133     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 134     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 135     CTI_INTMAX_TYPE,
 136     CTI_UINTMAX_TYPE,
 137     CTI_WIDEST_INT_LIT_TYPE,
 138     CTI_WIDEST_UINT_LIT_TYPE,
 139
 140     CTI_CHAR_ARRAY_TYPE,
 141     CTI_WCHAR_ARRAY_TYPE,
 142     CTI_INT_ARRAY_TYPE,
 143     CTI_STRING_TYPE,
 144     CTI_CONST_STRING_TYPE,
 145
 146     /* Type for boolean expressions (bool in C++, int in C).  */
 147     CTI_TRUTHVALUE_TYPE,
 148     CTI_TRUTHVALUE_TRUE,
 149     CTI_TRUTHVALUE_FALSE,
 150
 151     CTI_DEFAULT_FUNCTION_TYPE,
 152
 153     /* These are not types, but we have to look them up all the time.  */
 154     CTI_FUNCTION_NAME_DECL,
 155     CTI_PRETTY_FUNCTION_NAME_DECL,
 156     CTI_C99_FUNCTION_NAME_DECL,
 157     CTI_SAVED_FUNCTION_NAME_DECLS,
 158
 159     CTI_VOID_ZERO,
 160
 161     CTI_NULL,
 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 /* The node for C++ `__null'.  */
 208 #define null_node                       c_global_trees[CTI_NULL]
 209
 210 extern GTY(()) tree c_global_trees[CTI_MAX];
 211
 212 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 213    tree for size reasons.  */
 214 struct sorted_fields_type GTY(())
 215 {
 216   int len;
 217   tree GTY((length ("%h.len"))) elts[1];
 218 };
 219
 220 /* Mark which labels are explicitly declared.
 221    These may be shadowed, and may be referenced from nested functions.  */
 222 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 223
 224 typedef enum c_language_kind
 225 {
 226   clk_c         = 0,            /* C90, C94 or C99 */
 227   clk_objc      = 1,            /* clk_c with ObjC features.  */
 228   clk_cxx       = 2,            /* ANSI/ISO C++ */
 229   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 230 }
 231 c_language_kind;
 232
 233 /* To test for a specific language use c_language, defined by each
 234    front end.  For "ObjC features" or "not C++" use the macros.  */
 235 extern c_language_kind c_language;
 236
 237 #define c_dialect_cxx()         (c_language & clk_cxx)
 238 #define c_dialect_objc()        (c_language & clk_objc)
 239
 240 /* Information about a statement tree.  */
 241
 242 struct stmt_tree_s GTY(()) {
 243   /* The current statement list being collected.  */
 244   tree x_cur_stmt_list;
 245
 246   /* In C++, Nonzero if we should treat statements as full
 247      expressions.  In particular, this variable is no-zero if at the
 248      end of a statement we should destroy any temporaries created
 249      during that statement.  Similarly, if, at the end of a block, we
 250      should destroy any local variables in this block.  Normally, this
 251      variable is nonzero, since those are the normal semantics of
 252      C++.
 253
 254      However, in order to represent aggregate initialization code as
 255      tree structure, we use statement-expressions.  The statements
 256      within the statement expression should not result in cleanups
 257      being run until the entire enclosing statement is complete.
 258
 259      This flag has no effect in C.  */
 260   int stmts_are_full_exprs_p;
 261 };
 262
 263 typedef struct stmt_tree_s *stmt_tree;
 264
 265 /* Global state pertinent to the current function.  Some C dialects
 266    extend this structure with additional fields.  */
 267
 268 struct c_language_function GTY(()) {
 269   /* While we are parsing the function, this contains information
 270      about the statement-tree that we are building.  */
 271   struct stmt_tree_s x_stmt_tree;
 272 };
 273
 274 /* When building a statement-tree, this is the current statement list
 275    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 276    statement list.  */
 277
 278 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 279
 280 /* Language-specific hooks.  */
 281
 282 /* Callback that determines if it's ok for a function to have no
 283    noreturn attribute.  */
 284 extern int (*lang_missing_noreturn_ok_p) (tree);
 285
 286 /* If non-NULL, this function is called after a precompile header file
 287    is loaded.  */
 288 extern void (*lang_post_pch_load) (void);
 289
 290 extern void push_file_scope (void);
 291 extern void pop_file_scope (void);
 292 extern int yyparse (void);
 293 extern stmt_tree current_stmt_tree (void);
 294 extern tree push_stmt_list (void);
 295 extern tree pop_stmt_list (tree);
 296 extern tree add_stmt (tree);
 297 extern void push_cleanup (tree, tree, bool);
 298
 299 extern int c_expand_decl (tree);
 300
 301 extern int field_decl_cmp (const void *, const void *);
 302 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 303                                   void *);
 304 extern bool has_c_linkage (tree decl);
 305 \f
 306 /* Switches common to the C front ends.  */
 307
 308 /* Nonzero if prepreprocessing only.  */
 309
 310 extern int flag_preprocess_only;
 311
 312 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 313    calls will be used in ObjC; passing nil receivers to such calls
 314    will most likely result in crashes.  */
 315 extern int flag_nil_receivers;
 316
 317 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 318    @try, etc.) in source code.  */
 319 extern int flag_objc_exceptions;
 320
 321 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 322 extern int flag_objc_sjlj_exceptions;
 323
 324 /* Nonzero means that code generation will be altered to support
 325    "zero-link" execution.  This currently affects ObjC only, but may
 326    affect other languages in the future.  */
 327 extern int flag_zero_link;
 328
 329 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 330    unit.  It will inform the ObjC runtime that class definition(s) herein
 331    contained are to replace one(s) previously loaded.  */
 332 extern int flag_replace_objc_classes;
 333
 334 /* Nonzero means don't output line number information.  */
 335
 336 extern char flag_no_line_commands;
 337
 338 /* Nonzero causes -E output not to be done, but directives such as
 339    #define that have side effects are still obeyed.  */
 340
 341 extern char flag_no_output;
 342
 343 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 344    'N' of the command line switch.  */
 345
 346 extern char flag_dump_macros;
 347
 348 /* Nonzero means pass #include lines through to the output.  */
 349
 350 extern char flag_dump_includes;
 351
 352 /* Nonzero means process PCH files while preprocessing.  */
 353
 354 extern bool flag_pch_preprocess;
 355
 356 /* The file name to which we should write a precompiled header, or
 357    NULL if no header will be written in this compile.  */
 358
 359 extern const char *pch_file;
 360
 361 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 362    user's namespace.  */
 363
 364 extern int flag_iso;
 365
 366 /* Nonzero if -undef was given.  It suppresses target built-in macros
 367    and assertions.  */
 368
 369 extern int flag_undef;
 370
 371 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 372
 373 extern int flag_no_builtin;
 374
 375 /* Nonzero means don't recognize the non-ANSI builtin functions.
 376    -ansi sets this.  */
 377
 378 extern int flag_no_nonansi_builtin;
 379
 380 /* Nonzero means give `double' the same size as `float'.  */
 381
 382 extern int flag_short_double;
 383
 384 /* Nonzero means give `wchar_t' the same size as `short'.  */
 385
 386 extern int flag_short_wchar;
 387
 388 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 389 extern int flag_ms_extensions;
 390
 391 /* Nonzero means don't recognize the keyword `asm'.  */
 392
 393 extern int flag_no_asm;
 394
 395 /* Nonzero means give string constants the type `const char *', as mandated
 396    by the standard.  */
 397
 398 extern int flag_const_strings;
 399
 400 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 401
 402 extern int flag_signed_bitfields;
 403
 404 /* Nonzero means warn about deprecated conversion from string constant to
 405    `char *'.  */
 406
 407 extern int warn_write_strings;
 408
 409 /* Warn about #pragma directives that are not recognized.  */
 410
 411 extern int warn_unknown_pragmas; /* Tri state variable.  */
 412
 413 /* Warn about format/argument anomalies in calls to formatted I/O functions
 414    (*printf, *scanf, strftime, strfmon, etc.).  */
 415
 416 extern int warn_format;
 417
 418
 419 /* C/ObjC language option variables.  */
 420
 421
 422 /* Nonzero means allow type mismatches in conditional expressions;
 423    just make their values `void'.  */
 424
 425 extern int flag_cond_mismatch;
 426
 427 /* Nonzero means enable C89 Amendment 1 features.  */
 428
 429 extern int flag_isoc94;
 430
 431 /* Nonzero means use the ISO C99 dialect of C.  */
 432
 433 extern int flag_isoc99;
 434
 435 /* Nonzero means that we have builtin functions, and main is an int.  */
 436
 437 extern int flag_hosted;
 438
 439 /* Warn if main is suspicious.  */
 440
 441 extern int warn_main;
 442
 443
 444 /* ObjC language option variables.  */
 445
 446
 447 /* Open and close the file for outputting class declarations, if
 448    requested (ObjC).  */
 449
 450 extern int flag_gen_declaration;
 451
 452 /* Tells the compiler that this is a special run.  Do not perform any
 453    compiling, instead we are to test some platform dependent features
 454    and output a C header file with appropriate definitions.  */
 455
 456 extern int print_struct_values;
 457
 458 /* ???.  Undocumented.  */
 459
 460 extern const char *constant_string_class_name;
 461
 462
 463 /* C++ language option variables.  */
 464
 465
 466 /* Nonzero means don't recognize any extension keywords.  */
 467
 468 extern int flag_no_gnu_keywords;
 469
 470 /* Nonzero means do emit exported implementations of functions even if
 471    they can be inlined.  */
 472
 473 extern int flag_implement_inlines;
 474
 475 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 476
 477 extern int flag_implicit_templates;
 478
 479 /* Nonzero means that implicit instantiations of inline templates will be
 480    emitted if needed, even if instantiations of non-inline templates
 481    aren't.  */
 482
 483 extern int flag_implicit_inline_templates;
 484
 485 /* Nonzero means generate separate instantiation control files and
 486    juggle them at link time.  */
 487
 488 extern int flag_use_repository;
 489
 490 /* Nonzero if we want to issue diagnostics that the standard says are not
 491    required.  */
 492
 493 extern int flag_optional_diags;
 494
 495 /* Nonzero means we should attempt to elide constructors when possible.  */
 496
 497 extern int flag_elide_constructors;
 498
 499 /* Nonzero means that member functions defined in class scope are
 500    inline by default.  */
 501
 502 extern int flag_default_inline;
 503
 504 /* Controls whether compiler generates 'type descriptor' that give
 505    run-time type information.  */
 506
 507 extern int flag_rtti;
 508
 509 /* Nonzero if we want to conserve space in the .o files.  We do this
 510    by putting uninitialized data and runtime initialized data into
 511    .common instead of .data at the expense of not flagging multiple
 512    definitions.  */
 513
 514 extern int flag_conserve_space;
 515
 516 /* Nonzero if we want to obey access control semantics.  */
 517
 518 extern int flag_access_control;
 519
 520 /* Nonzero if we want to check the return value of new and avoid calling
 521    constructors if it is a null pointer.  */
 522
 523 extern int flag_check_new;
 524
 525 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 526    initialization variables.
 527    0: Old rules, set by -fno-for-scope.
 528    2: New ISO rules, set by -ffor-scope.
 529    1: Try to implement new ISO rules, but with backup compatibility
 530    (and warnings).  This is the default, for now.  */
 531
 532 extern int flag_new_for_scope;
 533
 534 /* Nonzero if we want to emit defined symbols with common-like linkage as
 535    weak symbols where possible, in order to conform to C++ semantics.
 536    Otherwise, emit them as local symbols.  */
 537
 538 extern int flag_weak;
 539
 540 /* 0 means we want the preprocessor to not emit line directives for
 541    the current working directory.  1 means we want it to do it.  -1
 542    means we should decide depending on whether debugging information
 543    is being emitted or not.  */
 544
 545 extern int flag_working_directory;
 546
 547 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 548    destructors for local statics and global objects.  */
 549
 550 extern int flag_use_cxa_atexit;
 551
 552 /* Nonzero means make the default pedwarns warnings instead of errors.
 553    The value of this flag is ignored if -pedantic is specified.  */
 554
 555 extern int flag_permissive;
 556
 557 /* Nonzero means to implement standard semantics for exception
 558    specifications, calling unexpected if an exception is thrown that
 559    doesn't match the specification.  Zero means to treat them as
 560    assertions and optimize accordingly, but not check them.  */
 561
 562 extern int flag_enforce_eh_specs;
 563
 564 /* Nonzero (the default) means to generate thread-safe code for
 565    initializing local statics.  */
 566
 567 extern int flag_threadsafe_statics;
 568
 569 /* Nonzero means warn about implicit declarations.  */
 570
 571 extern int warn_implicit;
 572
 573 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 574    with GCC this doesn't matter as __null is guaranteed to have the right
 575    size.  */
 576
 577 extern int warn_strict_null_sentinel;
 578
 579 /* Maximum template instantiation depth.  This limit is rather
 580    arbitrary, but it exists to limit the time it takes to notice
 581    infinite template instantiations.  */
 582
 583 extern int max_tinst_depth;
 584
 585 /* Nonzero means the expression being parsed will never be evaluated.
 586    This is a count, since unevaluated expressions can nest.  */
 587
 588 extern int skip_evaluation;
 589
 590 /* C types are partitioned into three subsets: object, function, and
 591    incomplete types.  */
 592 #define C_TYPE_OBJECT_P(type) \
 593   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 594
 595 #define C_TYPE_INCOMPLETE_P(type) \
 596   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 597
 598 #define C_TYPE_FUNCTION_P(type) \
 599   (TREE_CODE (type) == FUNCTION_TYPE)
 600
 601 /* For convenience we define a single macro to identify the class of
 602    object or incomplete types.  */
 603 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 604   (!C_TYPE_FUNCTION_P (type))
 605
 606 /* Attribute table common to the C front ends.  */
 607 extern const struct attribute_spec c_common_attribute_table[];
 608 extern const struct attribute_spec c_common_format_attribute_table[];
 609
 610 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 611    ID is the identifier to use, NAME is the string.
 612    TYPE_DEP indicates whether it depends on type of the function or not
 613    (i.e. __PRETTY_FUNCTION__).  */
 614
 615 extern tree (*make_fname_decl) (tree, int);
 616
 617 extern tree identifier_global_value (tree);
 618 extern void record_builtin_type (enum rid, const char *, tree);
 619 extern tree build_void_list_node (void);
 620 extern void start_fname_decls (void);
 621 extern void finish_fname_decls (void);
 622 extern const char *fname_as_string (int);
 623 extern tree fname_decl (unsigned, tree);
 624
 625 extern void check_function_arguments (tree, tree, tree);
 626 extern void check_function_arguments_recurse (void (*)
 627                                               (void *, tree,
 628                                                unsigned HOST_WIDE_INT),
 629                                               void *, tree,
 630                                               unsigned HOST_WIDE_INT);
 631 extern void check_function_format (tree, tree);
 632 extern void set_Wformat (int);
 633 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 634 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 635 extern int c_common_handle_option (size_t code, const char *arg, int value);
 636 extern bool c_common_missing_argument (const char *opt, size_t code);
 637 extern tree c_common_type_for_mode (enum machine_mode, int);
 638 extern tree c_common_type_for_size (unsigned int, int);
 639 extern tree c_common_unsigned_type (tree);
 640 extern tree c_common_signed_type (tree);
 641 extern tree c_common_signed_or_unsigned_type (int, tree);
 642 extern tree c_common_truthvalue_conversion (tree);
 643 extern void c_apply_type_quals_to_decl (int, tree);
 644 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 645 extern tree c_alignof_expr (tree);
 646 /* Print an error message for invalid operands to arith operation CODE.
 647    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 648 extern void binary_op_error (enum tree_code);
 649 extern tree fix_string_type (tree);
 650 struct varray_head_tag;
 651 extern void constant_expression_warning (tree);
 652 extern void strict_aliasing_warning(tree, tree, tree);
 653 extern tree convert_and_check (tree, tree);
 654 extern void overflow_warning (tree);
 655 extern void unsigned_conversion_warning (tree, tree);
 656 extern bool c_determine_visibility (tree);
 657 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 658
 659 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 660 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 661
 662 /* Subroutine of build_binary_op, used for comparison operations.
 663    See if the operands have both been converted from subword integer types
 664    and, if so, perhaps change them both back to their original type.  */
 665 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 666
 667 extern tree pointer_int_sum (enum tree_code, tree, tree);
 668 extern unsigned int min_precision (tree, int);
 669
 670 /* Add qualifiers to a type, in the fashion for C.  */
 671 extern tree c_build_qualified_type (tree, int);
 672
 673 /* Build tree nodes and builtin functions common to both C and C++ language
 674    frontends.  */
 675 extern void c_common_nodes_and_builtins (void);
 676
 677 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 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 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 695
 696 /* This is the basic parsing function.  */
 697 extern void c_parse_file (void);
 698 /* This is misnamed, it actually performs end-of-compilation processing.  */
 699 extern void finish_file (void);
 700
 701
 702 /* These macros provide convenient access to the various _STMT nodes.  */
 703
 704 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 705    if a statement expression.  */
 706 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 707   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 708
 709 /* Nonzero if a label has been added to the statement list.  */
 710 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 711   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 712
 713 /* COMPOUND_LITERAL_EXPR accessors.  */
 714 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 715   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 716 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 717   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 718
 719 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 720
 721 enum c_tree_code {
 722   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 723 #include "c-common.def"
 724   LAST_C_TREE_CODE
 725 };
 726
 727 #undef DEFTREECODE
 728
 729 extern int anon_aggr_type_p (tree);
 730
 731 /* For a VAR_DECL that is an anonymous union, these are the various
 732    sub-variables that make up the anonymous union.  */
 733 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 734
 735 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 736 #define DECL_C_BIT_FIELD(NODE) \
 737   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 738 #define SET_DECL_C_BIT_FIELD(NODE) \
 739   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 740 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 741   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 742
 743 extern void emit_local_var (tree);
 744 extern tree do_case (tree, tree);
 745 extern tree build_stmt (enum tree_code, ...);
 746 extern tree build_case_label (tree, tree, tree);
 747
 748 /* These functions must be defined by each front-end which implements
 749    a variant of the C language.  They are used in c-common.c.  */
 750
 751 extern tree build_unary_op (enum tree_code, tree, int);
 752 extern tree build_binary_op (enum tree_code, tree, tree, int);
 753 extern tree perform_integral_promotions (tree);
 754
 755 /* Given two integer or real types, return the type for their sum.
 756    Given two compatible ANSI C types, returns the merged type.  */
 757
 758 extern tree common_type (tree, tree);
 759
 760 extern tree decl_constant_value (tree);
 761
 762 /* Handle increment and decrement of boolean types.  */
 763 extern tree boolean_increment (enum tree_code, tree);
 764
 765 extern int case_compare (splay_tree_key, splay_tree_key);
 766
 767 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 768
 769 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 770
 771 extern tree build_function_call (tree, tree);
 772
 773 extern tree resolve_overloaded_builtin (tree, tree);
 774
 775 extern tree finish_label_address_expr (tree);
 776
 777 /* Same function prototype, but the C and C++ front ends have
 778    different implementations.  Used in c-common.c.  */
 779 extern tree lookup_label (tree);
 780 extern tree lookup_name (tree);
 781
 782 extern int vector_types_convertible_p (tree t1, tree t2);
 783
 784 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 785
 786 extern tree c_staticp (tree);
 787
 788 extern void init_c_lex (void);
 789
 790 extern void c_cpp_builtins (cpp_reader *);
 791
 792 /* Positive if an implicit `extern "C"' scope has just been entered;
 793    negative if such a scope has just been exited.  */
 794 extern GTY(()) int pending_lang_change;
 795
 796 /* Information recorded about each file examined during compilation.  */
 797
 798 struct c_fileinfo
 799 {
 800   int time;     /* Time spent in the file.  */
 801
 802   /* Flags used only by C++.
 803      INTERFACE_ONLY nonzero means that we are in an "interface" section
 804      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 805      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 806      INTERFACE_ONLY is zero, it means that we are responsible for
 807      exporting definitions that others might need.  */
 808   short interface_only;
 809   short interface_unknown;
 810 };
 811
 812 struct c_fileinfo *get_fileinfo (const char *);
 813 extern void dump_time_statistics (void);
 814
 815 extern bool c_dump_tree (void *, tree);
 816
 817 extern void c_warn_unused_result (tree *);
 818
 819 extern void verify_sequence_points (tree);
 820
 821 extern tree fold_offsetof (tree);
 822
 823 /* Places where an lvalue, or modifiable lvalue, may be required.
 824    Used to select diagnostic messages in lvalue_error and
 825    readonly_error.  */
 826 enum lvalue_use {
 827   lv_assign,
 828   lv_increment,
 829   lv_decrement,
 830   lv_addressof,
 831   lv_asm
 832 };
 833
 834 extern void lvalue_error (enum lvalue_use);
 835
 836 extern int complete_array_type (tree *, tree, bool);
 837
 838 extern tree builtin_type_for_size (int, bool);
 839
 840 extern void warn_array_subscript_with_type_char (tree);
 841
 842 /* In c-gimplify.c  */
 843 extern void c_genericize (tree);
 844 extern int c_gimplify_expr (tree *, tree *, tree *);
 845 extern tree c_build_bind_expr (tree, tree);
 846
 847 /* In c-pch.c  */
 848 extern void pch_init (void);
 849 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 850 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 851                                const char *orig);
 852 extern void c_common_write_pch (void);
 853 extern void c_common_no_more_pch (void);
 854 extern void c_common_pch_pragma (cpp_reader *pfile);
 855 extern void c_common_print_pch_checksum (FILE *f);
 856
 857 /* In *-checksum.c */
 858 extern const unsigned char executable_checksum[16];
 859
 860 extern void builtin_define_with_value (const char *, const char *, int);
 861 extern void c_stddef_cpp_builtins (void);
 862 extern void fe_file_change (const struct line_map *);
 863 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 864
 865 /* Objective-C / Objective-C++ entry points.  */
 866
 867 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 868    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 869 extern tree objc_is_class_name (tree);
 870 extern tree objc_is_object_ptr (tree);
 871 extern void objc_check_decl (tree);
 872 extern int objc_is_reserved_word (tree);
 873 extern bool objc_compare_types (tree, tree, int, tree);
 874 extern void objc_volatilize_decl (tree);
 875 extern bool objc_type_quals_match (tree, tree);
 876 extern tree objc_rewrite_function_call (tree, tree);
 877 extern tree objc_message_selector (void);
 878 extern tree objc_lookup_ivar (tree, tree);
 879 extern void objc_clear_super_receiver (void);
 880 extern int objc_is_public (tree, tree);
 881 extern tree objc_is_id (tree);
 882 extern void objc_declare_alias (tree, tree);
 883 extern void objc_declare_class (tree);
 884 extern void objc_declare_protocols (tree);
 885 extern tree objc_build_message_expr (tree);
 886 extern tree objc_finish_message_expr (tree, tree, tree);
 887 extern tree objc_build_selector_expr (tree);
 888 extern tree objc_build_protocol_expr (tree);
 889 extern tree objc_build_encode_expr (tree);
 890 extern tree objc_build_string_object (tree);
 891 extern tree objc_get_protocol_qualified_type (tree, tree);
 892 extern tree objc_get_class_reference (tree);
 893 extern tree objc_get_class_ivars (tree);
 894 extern void objc_start_class_interface (tree, tree, tree);
 895 extern void objc_start_category_interface (tree, tree, tree);
 896 extern void objc_start_protocol (tree, tree);
 897 extern void objc_continue_interface (void);
 898 extern void objc_finish_interface (void);
 899 extern void objc_start_class_implementation (tree, tree);
 900 extern void objc_start_category_implementation (tree, tree);
 901 extern void objc_continue_implementation (void);
 902 extern void objc_finish_implementation (void);
 903 extern void objc_set_visibility (int);
 904 extern void objc_set_method_type (enum tree_code);
 905 extern tree objc_build_method_signature (tree, tree, tree, bool);
 906 extern void objc_add_method_declaration (tree);
 907 extern void objc_start_method_definition (tree);
 908 extern void objc_finish_method_definition (tree);
 909 extern void objc_add_instance_variable (tree);
 910 extern tree objc_build_keyword_decl (tree, tree, tree);
 911 extern tree objc_build_throw_stmt (tree);
 912 extern void objc_begin_try_stmt (location_t, tree);
 913 extern tree objc_finish_try_stmt (void);
 914 extern void objc_begin_catch_clause (tree);
 915 extern void objc_finish_catch_clause (void);
 916 extern void objc_build_finally_clause (location_t, tree);
 917 extern tree objc_build_synchronized (location_t, tree, tree);
 918 extern int objc_static_init_needed_p (void);
 919 extern tree objc_generate_static_init_call (tree);
 920 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
 921
 922 /* The following are provided by the C and C++ front-ends, and called by
 923    ObjC/ObjC++.  */
 924 extern void *objc_get_current_scope (void);
 925 extern void objc_mark_locals_volatile (void *);
 926
 927 /* In c-ppoutput.c  */
 928 extern void init_pp_output (FILE *);
 929 extern void preprocess_file (cpp_reader *);
 930 extern void pp_file_change (const struct line_map *);
 931 extern void pp_dir_change (cpp_reader *, const char *);
 932 extern bool check_missing_format_attribute (tree, tree);
 933
 934 /* In order for the format checking to accept the C frontend
 935    diagnostic framework extensions, you must include this file before
 936    toplev.h, not after.  The C front end formats are a subset of those
 937    for C++, so they are the appropriate set to use in common code;
 938    cp-tree.h overrides this for C++.  */
 939 #ifndef GCC_DIAG_STYLE
 940 #define GCC_DIAG_STYLE __gcc_cdiag__
 941 #endif
 942
 943 #endif /* ! GCC_C_COMMON_H */