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   RID_DFLOAT32, RID_DFLOAT64, RID_DFLOAT128,
  76
  77   /* Too many ways of getting the name of a function as a string */
  78   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  79
  80   /* C++ */
  81   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  82   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  83   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  84   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  85   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  86   RID_THIS,     RID_THROW,    RID_TRUE,
  87   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  88   RID_USING,
  89
  90   /* casts */
  91   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  92
  93   /* Objective-C */
  94   RID_AT_ENCODE,   RID_AT_END,
  95   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
  96   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
  97   RID_AT_PROTOCOL, RID_AT_SELECTOR,
  98   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
  99   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 100   RID_AT_INTERFACE,
 101   RID_AT_IMPLEMENTATION,
 102
 103   RID_MAX,
 104
 105   RID_FIRST_MODIFIER = RID_STATIC,
 106   RID_LAST_MODIFIER = RID_ONEWAY,
 107
 108   RID_FIRST_AT = RID_AT_ENCODE,
 109   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 110   RID_FIRST_PQ = RID_IN,
 111   RID_LAST_PQ = RID_ONEWAY
 112 };
 113
 114 #define OBJC_IS_AT_KEYWORD(rid) \
 115   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 116    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 117
 118 #define OBJC_IS_PQ_KEYWORD(rid) \
 119   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 120    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 121
 122 /* The elements of `ridpointers' are identifier nodes for the reserved
 123    type names and storage classes.  It is indexed by a RID_... value.  */
 124 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 125
 126 /* Standard named or nameless data types of the C compiler.  */
 127
 128 enum c_tree_index
 129 {
 130     CTI_WCHAR_TYPE,
 131     CTI_SIGNED_WCHAR_TYPE,
 132     CTI_UNSIGNED_WCHAR_TYPE,
 133     CTI_WINT_TYPE,
 134     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 135     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 136     CTI_INTMAX_TYPE,
 137     CTI_UINTMAX_TYPE,
 138     CTI_WIDEST_INT_LIT_TYPE,
 139     CTI_WIDEST_UINT_LIT_TYPE,
 140
 141     CTI_CHAR_ARRAY_TYPE,
 142     CTI_WCHAR_ARRAY_TYPE,
 143     CTI_INT_ARRAY_TYPE,
 144     CTI_STRING_TYPE,
 145     CTI_CONST_STRING_TYPE,
 146
 147     /* Type for boolean expressions (bool in C++, int in C).  */
 148     CTI_TRUTHVALUE_TYPE,
 149     CTI_TRUTHVALUE_TRUE,
 150     CTI_TRUTHVALUE_FALSE,
 151
 152     CTI_DEFAULT_FUNCTION_TYPE,
 153
 154     /* These are not types, but we have to look them up all the time.  */
 155     CTI_FUNCTION_NAME_DECL,
 156     CTI_PRETTY_FUNCTION_NAME_DECL,
 157     CTI_C99_FUNCTION_NAME_DECL,
 158     CTI_SAVED_FUNCTION_NAME_DECLS,
 159
 160     CTI_VOID_ZERO,
 161
 162     CTI_NULL,
 163
 164     CTI_MAX
 165 };
 166
 167 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 168
 169 /* Identifier part common to the C front ends.  Inherits from
 170    tree_identifier, despite appearances.  */
 171 struct c_common_identifier GTY(())
 172 {
 173   struct tree_common common;
 174   struct cpp_hashnode node;
 175 };
 176
 177 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 178 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 179 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 180 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 181 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 182 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 183 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 184 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 185 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 186 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 187
 188 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 189 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 190 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 191
 192 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 193 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 194 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 195 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 196 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 197
 198 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 199
 200 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 201 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 202 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 203 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 204
 205 /* A node for `((void) 0)'.  */
 206 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 207
 208 /* The node for C++ `__null'.  */
 209 #define null_node                       c_global_trees[CTI_NULL]
 210
 211 extern GTY(()) tree c_global_trees[CTI_MAX];
 212
 213 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 214    tree for size reasons.  */
 215 struct sorted_fields_type GTY(())
 216 {
 217   int len;
 218   tree GTY((length ("%h.len"))) elts[1];
 219 };
 220
 221 /* Mark which labels are explicitly declared.
 222    These may be shadowed, and may be referenced from nested functions.  */
 223 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 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 statement 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 statement list
 276    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 277    statement list.  */
 278
 279 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 280
 281 /* Language-specific hooks.  */
 282
 283 /* Callback that determines if it's ok for a function to have no
 284    noreturn attribute.  */
 285 extern int (*lang_missing_noreturn_ok_p) (tree);
 286
 287 /* If non-NULL, this function is called after a precompile header file
 288    is loaded.  */
 289 extern void (*lang_post_pch_load) (void);
 290
 291 extern void push_file_scope (void);
 292 extern void pop_file_scope (void);
 293 extern int yyparse (void);
 294 extern stmt_tree current_stmt_tree (void);
 295 extern tree push_stmt_list (void);
 296 extern tree pop_stmt_list (tree);
 297 extern tree add_stmt (tree);
 298 extern void push_cleanup (tree, tree, bool);
 299
 300 extern int c_expand_decl (tree);
 301
 302 extern int field_decl_cmp (const void *, const void *);
 303 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 304                                   void *);
 305 extern bool has_c_linkage (tree decl);
 306 \f
 307 /* Switches common to the C front ends.  */
 308
 309 /* Nonzero if prepreprocessing only.  */
 310
 311 extern int flag_preprocess_only;
 312
 313 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 314    calls will be used in ObjC; passing nil receivers to such calls
 315    will most likely result in crashes.  */
 316 extern int flag_nil_receivers;
 317
 318 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 319    @try, etc.) in source code.  */
 320 extern int flag_objc_exceptions;
 321
 322 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 323 extern int flag_objc_sjlj_exceptions;
 324
 325 /* Nonzero means that code generation will be altered to support
 326    "zero-link" execution.  This currently affects ObjC only, but may
 327    affect other languages in the future.  */
 328 extern int flag_zero_link;
 329
 330 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 331    unit.  It will inform the ObjC runtime that class definition(s) herein
 332    contained are to replace one(s) previously loaded.  */
 333 extern int flag_replace_objc_classes;
 334
 335 /* Nonzero means don't output line number information.  */
 336
 337 extern char flag_no_line_commands;
 338
 339 /* Nonzero causes -E output not to be done, but directives such as
 340    #define that have side effects are still obeyed.  */
 341
 342 extern char flag_no_output;
 343
 344 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 345    'N' of the command line switch.  */
 346
 347 extern char flag_dump_macros;
 348
 349 /* Nonzero means pass #include lines through to the output.  */
 350
 351 extern char flag_dump_includes;
 352
 353 /* Nonzero means process PCH files while preprocessing.  */
 354
 355 extern bool flag_pch_preprocess;
 356
 357 /* The file name to which we should write a precompiled header, or
 358    NULL if no header will be written in this compile.  */
 359
 360 extern const char *pch_file;
 361
 362 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 363    user's namespace.  */
 364
 365 extern int flag_iso;
 366
 367 /* Nonzero if -undef was given.  It suppresses target built-in macros
 368    and assertions.  */
 369
 370 extern int flag_undef;
 371
 372 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 373
 374 extern int flag_no_builtin;
 375
 376 /* Nonzero means don't recognize the non-ANSI builtin functions.
 377    -ansi sets this.  */
 378
 379 extern int flag_no_nonansi_builtin;
 380
 381 /* Nonzero means give `double' the same size as `float'.  */
 382
 383 extern int flag_short_double;
 384
 385 /* Nonzero means give `wchar_t' the same size as `short'.  */
 386
 387 extern int flag_short_wchar;
 388
 389 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 390 extern int flag_ms_extensions;
 391
 392 /* Nonzero means don't recognize the keyword `asm'.  */
 393
 394 extern int flag_no_asm;
 395
 396 /* Nonzero means give string constants the type `const char *', as mandated
 397    by the standard.  */
 398
 399 extern int flag_const_strings;
 400
 401 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 402
 403 extern int flag_signed_bitfields;
 404
 405 /* Nonzero means warn about deprecated conversion from string constant to
 406    `char *'.  */
 407
 408 extern int warn_write_strings;
 409
 410 /* Warn about #pragma directives that are not recognized.  */
 411
 412 extern int warn_unknown_pragmas; /* Tri state variable.  */
 413
 414 /* Warn about format/argument anomalies in calls to formatted I/O functions
 415    (*printf, *scanf, strftime, strfmon, etc.).  */
 416
 417 extern int warn_format;
 418
 419
 420 /* C/ObjC language option variables.  */
 421
 422
 423 /* Nonzero means allow type mismatches in conditional expressions;
 424    just make their values `void'.  */
 425
 426 extern int flag_cond_mismatch;
 427
 428 /* Nonzero means enable C89 Amendment 1 features.  */
 429
 430 extern int flag_isoc94;
 431
 432 /* Nonzero means use the ISO C99 dialect of C.  */
 433
 434 extern int flag_isoc99;
 435
 436 /* Nonzero means that we have builtin functions, and main is an int.  */
 437
 438 extern int flag_hosted;
 439
 440 /* Warn if main is suspicious.  */
 441
 442 extern int warn_main;
 443
 444
 445 /* ObjC language option variables.  */
 446
 447
 448 /* Open and close the file for outputting class declarations, if
 449    requested (ObjC).  */
 450
 451 extern int flag_gen_declaration;
 452
 453 /* Tells the compiler that this is a special run.  Do not perform any
 454    compiling, instead we are to test some platform dependent features
 455    and output a C header file with appropriate definitions.  */
 456
 457 extern int print_struct_values;
 458
 459 /* ???.  Undocumented.  */
 460
 461 extern const char *constant_string_class_name;
 462
 463
 464 /* C++ language option variables.  */
 465
 466
 467 /* Nonzero means don't recognize any extension keywords.  */
 468
 469 extern int flag_no_gnu_keywords;
 470
 471 /* Nonzero means do emit exported implementations of functions even if
 472    they can be inlined.  */
 473
 474 extern int flag_implement_inlines;
 475
 476 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 477
 478 extern int flag_implicit_templates;
 479
 480 /* Nonzero means that implicit instantiations of inline templates will be
 481    emitted if needed, even if instantiations of non-inline templates
 482    aren't.  */
 483
 484 extern int flag_implicit_inline_templates;
 485
 486 /* Nonzero means generate separate instantiation control files and
 487    juggle them at link time.  */
 488
 489 extern int flag_use_repository;
 490
 491 /* Nonzero if we want to issue diagnostics that the standard says are not
 492    required.  */
 493
 494 extern int flag_optional_diags;
 495
 496 /* Nonzero means we should attempt to elide constructors when possible.  */
 497
 498 extern int flag_elide_constructors;
 499
 500 /* Nonzero means that member functions defined in class scope are
 501    inline by default.  */
 502
 503 extern int flag_default_inline;
 504
 505 /* Controls whether compiler generates 'type descriptor' that give
 506    run-time type information.  */
 507
 508 extern int flag_rtti;
 509
 510 /* Nonzero if we want to conserve space in the .o files.  We do this
 511    by putting uninitialized data and runtime initialized data into
 512    .common instead of .data at the expense of not flagging multiple
 513    definitions.  */
 514
 515 extern int flag_conserve_space;
 516
 517 /* Nonzero if we want to obey access control semantics.  */
 518
 519 extern int flag_access_control;
 520
 521 /* Nonzero if we want to check the return value of new and avoid calling
 522    constructors if it is a null pointer.  */
 523
 524 extern int flag_check_new;
 525
 526 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 527    initialization variables.
 528    0: Old rules, set by -fno-for-scope.
 529    2: New ISO rules, set by -ffor-scope.
 530    1: Try to implement new ISO rules, but with backup compatibility
 531    (and warnings).  This is the default, for now.  */
 532
 533 extern int flag_new_for_scope;
 534
 535 /* Nonzero if we want to emit defined symbols with common-like linkage as
 536    weak symbols where possible, in order to conform to C++ semantics.
 537    Otherwise, emit them as local symbols.  */
 538
 539 extern int flag_weak;
 540
 541 /* 0 means we want the preprocessor to not emit line directives for
 542    the current working directory.  1 means we want it to do it.  -1
 543    means we should decide depending on whether debugging information
 544    is being emitted or not.  */
 545
 546 extern int flag_working_directory;
 547
 548 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 549    destructors for local statics and global objects.  */
 550
 551 extern int flag_use_cxa_atexit;
 552
 553 /* Nonzero means make the default pedwarns warnings instead of errors.
 554    The value of this flag is ignored if -pedantic is specified.  */
 555
 556 extern int flag_permissive;
 557
 558 /* Nonzero means to implement standard semantics for exception
 559    specifications, calling unexpected if an exception is thrown that
 560    doesn't match the specification.  Zero means to treat them as
 561    assertions and optimize accordingly, but not check them.  */
 562
 563 extern int flag_enforce_eh_specs;
 564
 565 /* Nonzero (the default) means to generate thread-safe code for
 566    initializing local statics.  */
 567
 568 extern int flag_threadsafe_statics;
 569
 570 /* Nonzero means warn about implicit declarations.  */
 571
 572 extern int warn_implicit;
 573
 574 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 575    with GCC this doesn't matter as __null is guaranteed to have the right
 576    size.  */
 577
 578 extern int warn_strict_null_sentinel;
 579
 580 /* Maximum template instantiation depth.  This limit is rather
 581    arbitrary, but it exists to limit the time it takes to notice
 582    infinite template instantiations.  */
 583
 584 extern int max_tinst_depth;
 585
 586 /* Nonzero means the expression being parsed will never be evaluated.
 587    This is a count, since unevaluated expressions can nest.  */
 588
 589 extern int skip_evaluation;
 590
 591 /* C types are partitioned into three subsets: object, function, and
 592    incomplete types.  */
 593 #define C_TYPE_OBJECT_P(type) \
 594   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 595
 596 #define C_TYPE_INCOMPLETE_P(type) \
 597   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 598
 599 #define C_TYPE_FUNCTION_P(type) \
 600   (TREE_CODE (type) == FUNCTION_TYPE)
 601
 602 /* For convenience we define a single macro to identify the class of
 603    object or incomplete types.  */
 604 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 605   (!C_TYPE_FUNCTION_P (type))
 606
 607 /* Attribute table common to the C front ends.  */
 608 extern const struct attribute_spec c_common_attribute_table[];
 609 extern const struct attribute_spec c_common_format_attribute_table[];
 610
 611 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 612    ID is the identifier to use, NAME is the string.
 613    TYPE_DEP indicates whether it depends on type of the function or not
 614    (i.e. __PRETTY_FUNCTION__).  */
 615
 616 extern tree (*make_fname_decl) (tree, int);
 617
 618 extern tree identifier_global_value (tree);
 619 extern void record_builtin_type (enum rid, const char *, tree);
 620 extern tree build_void_list_node (void);
 621 extern void start_fname_decls (void);
 622 extern void finish_fname_decls (void);
 623 extern const char *fname_as_string (int);
 624 extern tree fname_decl (unsigned, tree);
 625
 626 extern void check_function_arguments (tree, tree, tree);
 627 extern void check_function_arguments_recurse (void (*)
 628                                               (void *, tree,
 629                                                unsigned HOST_WIDE_INT),
 630                                               void *, tree,
 631                                               unsigned HOST_WIDE_INT);
 632 extern void check_function_format (tree, tree);
 633 extern void set_Wformat (int);
 634 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 635 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 636 extern int c_common_handle_option (size_t code, const char *arg, int value);
 637 extern bool c_common_missing_argument (const char *opt, size_t code);
 638 extern tree c_common_type_for_mode (enum machine_mode, int);
 639 extern tree c_common_type_for_size (unsigned int, int);
 640 extern tree c_common_unsigned_type (tree);
 641 extern tree c_common_signed_type (tree);
 642 extern tree c_common_signed_or_unsigned_type (int, tree);
 643 extern tree c_common_truthvalue_conversion (tree);
 644 extern void c_apply_type_quals_to_decl (int, tree);
 645 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 646 extern tree c_alignof_expr (tree);
 647 /* Print an error message for invalid operands to arith operation CODE.
 648    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 649 extern void binary_op_error (enum tree_code);
 650 extern tree fix_string_type (tree);
 651 struct varray_head_tag;
 652 extern void constant_expression_warning (tree);
 653 extern void strict_aliasing_warning(tree, tree, tree);
 654 extern tree convert_and_check (tree, tree);
 655 extern void overflow_warning (tree);
 656 extern void unsigned_conversion_warning (tree, tree);
 657 extern bool c_determine_visibility (tree);
 658 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 659
 660 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 661 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 662
 663 /* Subroutine of build_binary_op, used for comparison operations.
 664    See if the operands have both been converted from subword integer types
 665    and, if so, perhaps change them both back to their original type.  */
 666 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 667
 668 extern tree pointer_int_sum (enum tree_code, tree, tree);
 669 extern unsigned int min_precision (tree, int);
 670
 671 /* Add qualifiers to a type, in the fashion for C.  */
 672 extern tree c_build_qualified_type (tree, int);
 673
 674 /* Build tree nodes and builtin functions common to both C and C++ language
 675    frontends.  */
 676 extern void c_common_nodes_and_builtins (void);
 677
 678 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 679
 680 extern void disable_builtin_function (const char *);
 681
 682 extern tree build_va_arg (tree, tree);
 683
 684 extern unsigned int c_common_init_options (unsigned int, const char **);
 685 extern bool c_common_post_options (const char **);
 686 extern bool c_common_init (void);
 687 extern void c_common_finish (void);
 688 extern void c_common_parse_file (int);
 689 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 690 extern void c_register_builtin_type (tree, const char*);
 691 extern bool c_promoting_integer_type_p (tree);
 692 extern int self_promoting_args_p (tree);
 693 extern tree strip_array_types (tree);
 694 extern tree strip_pointer_operator (tree);
 695 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 696
 697 /* This is the basic parsing function.  */
 698 extern void c_parse_file (void);
 699 /* This is misnamed, it actually performs end-of-compilation processing.  */
 700 extern void finish_file (void);
 701
 702
 703 /* These macros provide convenient access to the various _STMT nodes.  */
 704
 705 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 706    if a statement expression.  */
 707 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 708   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 709
 710 /* Nonzero if a label has been added to the statement list.  */
 711 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 712   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 713
 714 /* COMPOUND_LITERAL_EXPR accessors.  */
 715 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 716   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 717 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 718   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 719
 720 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 721
 722 enum c_tree_code {
 723   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 724 #include "c-common.def"
 725   LAST_C_TREE_CODE
 726 };
 727
 728 #undef DEFTREECODE
 729
 730 extern int anon_aggr_type_p (tree);
 731
 732 /* For a VAR_DECL that is an anonymous union, these are the various
 733    sub-variables that make up the anonymous union.  */
 734 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 735
 736 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 737 #define DECL_C_BIT_FIELD(NODE) \
 738   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 739 #define SET_DECL_C_BIT_FIELD(NODE) \
 740   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 741 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 742   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 743
 744 extern void emit_local_var (tree);
 745 extern tree do_case (tree, tree);
 746 extern tree build_stmt (enum tree_code, ...);
 747 extern tree build_case_label (tree, tree, tree);
 748
 749 /* These functions must be defined by each front-end which implements
 750    a variant of the C language.  They are used in c-common.c.  */
 751
 752 extern tree build_unary_op (enum tree_code, tree, int);
 753 extern tree build_binary_op (enum tree_code, tree, tree, int);
 754 extern tree perform_integral_promotions (tree);
 755
 756 /* Given two integer or real types, return the type for their sum.
 757    Given two compatible ANSI C types, returns the merged type.  */
 758
 759 extern tree common_type (tree, tree);
 760
 761 extern tree decl_constant_value (tree);
 762
 763 /* Handle increment and decrement of boolean types.  */
 764 extern tree boolean_increment (enum tree_code, tree);
 765
 766 extern int case_compare (splay_tree_key, splay_tree_key);
 767
 768 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 769
 770 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 771
 772 extern tree build_function_call (tree, tree);
 773
 774 extern tree resolve_overloaded_builtin (tree, tree);
 775
 776 extern tree finish_label_address_expr (tree);
 777
 778 /* Same function prototype, but the C and C++ front ends have
 779    different implementations.  Used in c-common.c.  */
 780 extern tree lookup_label (tree);
 781 extern tree lookup_name (tree);
 782
 783 extern int vector_types_convertible_p (tree t1, tree t2);
 784
 785 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 786
 787 extern tree c_staticp (tree);
 788
 789 extern void init_c_lex (void);
 790
 791 extern void c_cpp_builtins (cpp_reader *);
 792
 793 /* Positive if an implicit `extern "C"' scope has just been entered;
 794    negative if such a scope has just been exited.  */
 795 extern GTY(()) int pending_lang_change;
 796
 797 /* Information recorded about each file examined during compilation.  */
 798
 799 struct c_fileinfo
 800 {
 801   int time;     /* Time spent in the file.  */
 802
 803   /* Flags used only by C++.
 804      INTERFACE_ONLY nonzero means that we are in an "interface" section
 805      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 806      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 807      INTERFACE_ONLY is zero, it means that we are responsible for
 808      exporting definitions that others might need.  */
 809   short interface_only;
 810   short interface_unknown;
 811 };
 812
 813 struct c_fileinfo *get_fileinfo (const char *);
 814 extern void dump_time_statistics (void);
 815
 816 extern bool c_dump_tree (void *, tree);
 817
 818 extern void c_warn_unused_result (tree *);
 819
 820 extern void verify_sequence_points (tree);
 821
 822 extern tree fold_offsetof (tree);
 823
 824 /* Places where an lvalue, or modifiable lvalue, may be required.
 825    Used to select diagnostic messages in lvalue_error and
 826    readonly_error.  */
 827 enum lvalue_use {
 828   lv_assign,
 829   lv_increment,
 830   lv_decrement,
 831   lv_addressof,
 832   lv_asm
 833 };
 834
 835 extern void lvalue_error (enum lvalue_use);
 836
 837 extern int complete_array_type (tree *, tree, bool);
 838
 839 extern tree builtin_type_for_size (int, bool);
 840
 841 extern void warn_array_subscript_with_type_char (tree);
 842
 843 /* In c-gimplify.c  */
 844 extern void c_genericize (tree);
 845 extern int c_gimplify_expr (tree *, tree *, tree *);
 846 extern tree c_build_bind_expr (tree, tree);
 847
 848 /* In c-pch.c  */
 849 extern void pch_init (void);
 850 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 851 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 852                                const char *orig);
 853 extern void c_common_write_pch (void);
 854 extern void c_common_no_more_pch (void);
 855 extern void c_common_pch_pragma (cpp_reader *pfile);
 856 extern void c_common_print_pch_checksum (FILE *f);
 857
 858 /* In *-checksum.c */
 859 extern const unsigned char executable_checksum[16];
 860
 861 extern void builtin_define_with_value (const char *, const char *, int);
 862 extern void c_stddef_cpp_builtins (void);
 863 extern void fe_file_change (const struct line_map *);
 864 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 865
 866 /* Objective-C / Objective-C++ entry points.  */
 867
 868 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 869    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 870 extern tree objc_is_class_name (tree);
 871 extern tree objc_is_object_ptr (tree);
 872 extern void objc_check_decl (tree);
 873 extern int objc_is_reserved_word (tree);
 874 extern bool objc_compare_types (tree, tree, int, tree);
 875 extern void objc_volatilize_decl (tree);
 876 extern bool objc_type_quals_match (tree, tree);
 877 extern tree objc_rewrite_function_call (tree, tree);
 878 extern tree objc_message_selector (void);
 879 extern tree objc_lookup_ivar (tree, tree);
 880 extern void objc_clear_super_receiver (void);
 881 extern int objc_is_public (tree, tree);
 882 extern tree objc_is_id (tree);
 883 extern void objc_declare_alias (tree, tree);
 884 extern void objc_declare_class (tree);
 885 extern void objc_declare_protocols (tree);
 886 extern tree objc_build_message_expr (tree);
 887 extern tree objc_finish_message_expr (tree, tree, tree);
 888 extern tree objc_build_selector_expr (tree);
 889 extern tree objc_build_protocol_expr (tree);
 890 extern tree objc_build_encode_expr (tree);
 891 extern tree objc_build_string_object (tree);
 892 extern tree objc_get_protocol_qualified_type (tree, tree);
 893 extern tree objc_get_class_reference (tree);
 894 extern tree objc_get_class_ivars (tree);
 895 extern void objc_start_class_interface (tree, tree, tree);
 896 extern void objc_start_category_interface (tree, tree, tree);
 897 extern void objc_start_protocol (tree, tree);
 898 extern void objc_continue_interface (void);
 899 extern void objc_finish_interface (void);
 900 extern void objc_start_class_implementation (tree, tree);
 901 extern void objc_start_category_implementation (tree, tree);
 902 extern void objc_continue_implementation (void);
 903 extern void objc_finish_implementation (void);
 904 extern void objc_set_visibility (int);
 905 extern void objc_set_method_type (enum tree_code);
 906 extern tree objc_build_method_signature (tree, tree, tree, bool);
 907 extern void objc_add_method_declaration (tree);
 908 extern void objc_start_method_definition (tree);
 909 extern void objc_finish_method_definition (tree);
 910 extern void objc_add_instance_variable (tree);
 911 extern tree objc_build_keyword_decl (tree, tree, tree);
 912 extern tree objc_build_throw_stmt (tree);
 913 extern void objc_begin_try_stmt (location_t, tree);
 914 extern tree objc_finish_try_stmt (void);
 915 extern void objc_begin_catch_clause (tree);
 916 extern void objc_finish_catch_clause (void);
 917 extern void objc_build_finally_clause (location_t, tree);
 918 extern tree objc_build_synchronized (location_t, tree, tree);
 919 extern int objc_static_init_needed_p (void);
 920 extern tree objc_generate_static_init_call (tree);
 921 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
 922
 923 /* The following are provided by the C and C++ front-ends, and called by
 924    ObjC/ObjC++.  */
 925 extern void *objc_get_current_scope (void);
 926 extern void objc_mark_locals_volatile (void *);
 927
 928 /* In c-ppoutput.c  */
 929 extern void init_pp_output (FILE *);
 930 extern void preprocess_file (cpp_reader *);
 931 extern void pp_file_change (const struct line_map *);
 932 extern void pp_dir_change (cpp_reader *, const char *);
 933 extern bool check_missing_format_attribute (tree, tree);
 934
 935 /* In order for the format checking to accept the C frontend
 936    diagnostic framework extensions, you must include this file before
 937    toplev.h, not after.  The C front end formats are a subset of those
 938    for C++, so they are the appropriate set to use in common code;
 939    cp-tree.h overrides this for C++.  */
 940 #ifndef GCC_DIAG_STYLE
 941 #define GCC_DIAG_STYLE __gcc_cdiag__
 942 #endif
 943
 944 #endif /* ! GCC_C_COMMON_H */