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 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 extern tree pushdecl_top_level (tree);
 299 extern tree pushdecl (tree);
 300 extern tree build_modify_expr (tree, enum tree_code, tree);
 301 extern tree build_indirect_ref (tree, const char *);
 302
 303 extern int c_expand_decl (tree);
 304
 305 extern int field_decl_cmp (const void *, const void *);
 306 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 307                                   void *);
 308 extern bool has_c_linkage (tree decl);
 309 \f
 310 /* Switches common to the C front ends.  */
 311
 312 /* Nonzero if prepreprocessing only.  */
 313
 314 extern int flag_preprocess_only;
 315
 316 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 317    calls will be used in ObjC; passing nil receivers to such calls
 318    will most likely result in crashes.  */
 319 extern int flag_nil_receivers;
 320
 321 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 322    @try, etc.) in source code.  */
 323 extern int flag_objc_exceptions;
 324
 325 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 326 extern int flag_objc_sjlj_exceptions;
 327
 328 /* Nonzero means that code generation will be altered to support
 329    "zero-link" execution.  This currently affects ObjC only, but may
 330    affect other languages in the future.  */
 331 extern int flag_zero_link;
 332
 333 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 334    unit.  It will inform the ObjC runtime that class definition(s) herein
 335    contained are to replace one(s) previously loaded.  */
 336 extern int flag_replace_objc_classes;
 337
 338 /* Nonzero means don't output line number information.  */
 339
 340 extern char flag_no_line_commands;
 341
 342 /* Nonzero causes -E output not to be done, but directives such as
 343    #define that have side effects are still obeyed.  */
 344
 345 extern char flag_no_output;
 346
 347 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 348    'N' of the command line switch.  */
 349
 350 extern char flag_dump_macros;
 351
 352 /* Nonzero means pass #include lines through to the output.  */
 353
 354 extern char flag_dump_includes;
 355
 356 /* Nonzero means process PCH files while preprocessing.  */
 357
 358 extern bool flag_pch_preprocess;
 359
 360 /* The file name to which we should write a precompiled header, or
 361    NULL if no header will be written in this compile.  */
 362
 363 extern const char *pch_file;
 364
 365 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 366    user's namespace.  */
 367
 368 extern int flag_iso;
 369
 370 /* Nonzero if -undef was given.  It suppresses target built-in macros
 371    and assertions.  */
 372
 373 extern int flag_undef;
 374
 375 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 376
 377 extern int flag_no_builtin;
 378
 379 /* Nonzero means don't recognize the non-ANSI builtin functions.
 380    -ansi sets this.  */
 381
 382 extern int flag_no_nonansi_builtin;
 383
 384 /* Nonzero means give `double' the same size as `float'.  */
 385
 386 extern int flag_short_double;
 387
 388 /* Nonzero means give `wchar_t' the same size as `short'.  */
 389
 390 extern int flag_short_wchar;
 391
 392 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 393 extern int flag_ms_extensions;
 394
 395 /* Nonzero means don't recognize the keyword `asm'.  */
 396
 397 extern int flag_no_asm;
 398
 399 /* Nonzero means give string constants the type `const char *', as mandated
 400    by the standard.  */
 401
 402 extern int flag_const_strings;
 403
 404 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 405
 406 extern int flag_signed_bitfields;
 407
 408 /* Warn about #pragma directives that are not recognized.  */
 409
 410 extern int warn_unknown_pragmas; /* Tri state variable.  */
 411
 412 /* Warn about format/argument anomalies in calls to formatted I/O functions
 413    (*printf, *scanf, strftime, strfmon, etc.).  */
 414
 415 extern int warn_format;
 416
 417
 418 /* C/ObjC language option variables.  */
 419
 420
 421 /* Nonzero means allow type mismatches in conditional expressions;
 422    just make their values `void'.  */
 423
 424 extern int flag_cond_mismatch;
 425
 426 /* Nonzero means enable C89 Amendment 1 features.  */
 427
 428 extern int flag_isoc94;
 429
 430 /* Nonzero means use the ISO C99 dialect of C.  */
 431
 432 extern int flag_isoc99;
 433
 434 /* Nonzero means that we have builtin functions, and main is an int.  */
 435
 436 extern int flag_hosted;
 437
 438 /* Warn if main is suspicious.  */
 439
 440 extern int warn_main;
 441
 442
 443 /* ObjC language option variables.  */
 444
 445
 446 /* Open and close the file for outputting class declarations, if
 447    requested (ObjC).  */
 448
 449 extern int flag_gen_declaration;
 450
 451 /* Tells the compiler that this is a special run.  Do not perform any
 452    compiling, instead we are to test some platform dependent features
 453    and output a C header file with appropriate definitions.  */
 454
 455 extern int print_struct_values;
 456
 457 /* ???.  Undocumented.  */
 458
 459 extern const char *constant_string_class_name;
 460
 461
 462 /* C++ language option variables.  */
 463
 464
 465 /* Nonzero means don't recognize any extension keywords.  */
 466
 467 extern int flag_no_gnu_keywords;
 468
 469 /* Nonzero means do emit exported implementations of functions even if
 470    they can be inlined.  */
 471
 472 extern int flag_implement_inlines;
 473
 474 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 475
 476 extern int flag_implicit_templates;
 477
 478 /* Nonzero means that implicit instantiations of inline templates will be
 479    emitted if needed, even if instantiations of non-inline templates
 480    aren't.  */
 481
 482 extern int flag_implicit_inline_templates;
 483
 484 /* Nonzero means generate separate instantiation control files and
 485    juggle them at link time.  */
 486
 487 extern int flag_use_repository;
 488
 489 /* Nonzero if we want to issue diagnostics that the standard says are not
 490    required.  */
 491
 492 extern int flag_optional_diags;
 493
 494 /* Nonzero means we should attempt to elide constructors when possible.  */
 495
 496 extern int flag_elide_constructors;
 497
 498 /* Nonzero means that member functions defined in class scope are
 499    inline by default.  */
 500
 501 extern int flag_default_inline;
 502
 503 /* Controls whether compiler generates 'type descriptor' that give
 504    run-time type information.  */
 505
 506 extern int flag_rtti;
 507
 508 /* Nonzero if we want to conserve space in the .o files.  We do this
 509    by putting uninitialized data and runtime initialized data into
 510    .common instead of .data at the expense of not flagging multiple
 511    definitions.  */
 512
 513 extern int flag_conserve_space;
 514
 515 /* Nonzero if we want to obey access control semantics.  */
 516
 517 extern int flag_access_control;
 518
 519 /* Nonzero if we want to check the return value of new and avoid calling
 520    constructors if it is a null pointer.  */
 521
 522 extern int flag_check_new;
 523
 524 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 525    initialization variables.
 526    0: Old rules, set by -fno-for-scope.
 527    2: New ISO rules, set by -ffor-scope.
 528    1: Try to implement new ISO rules, but with backup compatibility
 529    (and warnings).  This is the default, for now.  */
 530
 531 extern int flag_new_for_scope;
 532
 533 /* Nonzero if we want to emit defined symbols with common-like linkage as
 534    weak symbols where possible, in order to conform to C++ semantics.
 535    Otherwise, emit them as local symbols.  */
 536
 537 extern int flag_weak;
 538
 539 /* 0 means we want the preprocessor to not emit line directives for
 540    the current working directory.  1 means we want it to do it.  -1
 541    means we should decide depending on whether debugging information
 542    is being emitted or not.  */
 543
 544 extern int flag_working_directory;
 545
 546 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 547    destructors for local statics and global objects.  */
 548
 549 extern int flag_use_cxa_atexit;
 550
 551 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
 552    logic.  */
 553
 554 extern int flag_use_cxa_get_exception_ptr;
 555
 556 /* Nonzero means make the default pedwarns warnings instead of errors.
 557    The value of this flag is ignored if -pedantic is specified.  */
 558
 559 extern int flag_permissive;
 560
 561 /* Nonzero means to implement standard semantics for exception
 562    specifications, calling unexpected if an exception is thrown that
 563    doesn't match the specification.  Zero means to treat them as
 564    assertions and optimize accordingly, but not check them.  */
 565
 566 extern int flag_enforce_eh_specs;
 567
 568 /* Nonzero (the default) means to generate thread-safe code for
 569    initializing local statics.  */
 570
 571 extern int flag_threadsafe_statics;
 572
 573 /* Nonzero means warn about implicit declarations.  */
 574
 575 extern int warn_implicit;
 576
 577 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 578    with GCC this doesn't matter as __null is guaranteed to have the right
 579    size.  */
 580
 581 extern int warn_strict_null_sentinel;
 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, 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_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 647 extern tree c_common_truthvalue_conversion (tree);
 648 extern void c_apply_type_quals_to_decl (int, tree);
 649 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 650 extern tree c_alignof_expr (tree);
 651 /* Print an error message for invalid operands to arith operation CODE.
 652    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 653 extern void binary_op_error (enum tree_code);
 654 extern tree fix_string_type (tree);
 655 struct varray_head_tag;
 656 extern void constant_expression_warning (tree);
 657 extern void strict_aliasing_warning(tree, tree, tree);
 658 extern void empty_body_warning (tree, tree);
 659 extern tree convert_and_check (tree, tree);
 660 extern void overflow_warning (tree);
 661 extern bool c_determine_visibility (tree);
 662 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 663
 664 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 665 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 666
 667 /* Subroutine of build_binary_op, used for comparison operations.
 668    See if the operands have both been converted from subword integer types
 669    and, if so, perhaps change them both back to their original type.  */
 670 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 671
 672 extern tree pointer_int_sum (enum tree_code, tree, tree);
 673 extern unsigned int min_precision (tree, int);
 674
 675 /* Add qualifiers to a type, in the fashion for C.  */
 676 extern tree c_build_qualified_type (tree, int);
 677
 678 /* Build tree nodes and builtin functions common to both C and C++ language
 679    frontends.  */
 680 extern void c_common_nodes_and_builtins (void);
 681
 682 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 683
 684 extern void disable_builtin_function (const char *);
 685
 686 extern void set_compound_literal_name (tree decl);
 687
 688 extern tree build_va_arg (tree, tree);
 689
 690 extern unsigned int c_common_init_options (unsigned int, const char **);
 691 extern bool c_common_post_options (const char **);
 692 extern bool c_common_init (void);
 693 extern void c_common_finish (void);
 694 extern void c_common_parse_file (int);
 695 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 696 extern void c_register_builtin_type (tree, const char*);
 697 extern bool c_promoting_integer_type_p (tree);
 698 extern int self_promoting_args_p (tree);
 699 extern tree strip_array_types (tree);
 700 extern tree strip_pointer_operator (tree);
 701 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 702
 703 /* This is the basic parsing function.  */
 704 extern void c_parse_file (void);
 705 /* This is misnamed, it actually performs end-of-compilation processing.  */
 706 extern void finish_file (void);
 707
 708
 709 /* These macros provide convenient access to the various _STMT nodes.  */
 710
 711 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 712    if a statement expression.  */
 713 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 714   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 715
 716 /* Nonzero if a label has been added to the statement list.  */
 717 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 718   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 719
 720 /* COMPOUND_LITERAL_EXPR accessors.  */
 721 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 722   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 723 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 724   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 725
 726 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 727
 728 enum c_tree_code {
 729   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 730 #include "c-common.def"
 731   LAST_C_TREE_CODE
 732 };
 733
 734 #undef DEFTREECODE
 735
 736 extern int anon_aggr_type_p (tree);
 737
 738 /* For a VAR_DECL that is an anonymous union, these are the various
 739    sub-variables that make up the anonymous union.  */
 740 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 741
 742 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 743 #define DECL_C_BIT_FIELD(NODE) \
 744   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 745 #define SET_DECL_C_BIT_FIELD(NODE) \
 746   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 747 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 748   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 749
 750 extern void emit_local_var (tree);
 751 extern tree do_case (tree, tree);
 752 extern tree build_stmt (enum tree_code, ...);
 753 extern tree build_case_label (tree, tree, tree);
 754
 755 /* These functions must be defined by each front-end which implements
 756    a variant of the C language.  They are used in c-common.c.  */
 757
 758 extern tree build_unary_op (enum tree_code, tree, int);
 759 extern tree build_binary_op (enum tree_code, tree, tree, int);
 760 extern tree perform_integral_promotions (tree);
 761
 762 /* These functions must be defined by each front-end which implements
 763    a variant of the C language.  They are used by port files.  */
 764
 765 extern tree default_conversion (tree);
 766
 767 /* Given two integer or real types, return the type for their sum.
 768    Given two compatible ANSI C types, returns the merged type.  */
 769
 770 extern tree common_type (tree, tree);
 771
 772 extern tree decl_constant_value (tree);
 773
 774 /* Handle increment and decrement of boolean types.  */
 775 extern tree boolean_increment (enum tree_code, tree);
 776
 777 extern int case_compare (splay_tree_key, splay_tree_key);
 778
 779 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 780
 781 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 782
 783 extern tree build_function_call (tree, tree);
 784
 785 extern tree resolve_overloaded_builtin (tree, tree);
 786
 787 extern tree finish_label_address_expr (tree);
 788
 789 /* Same function prototype, but the C and C++ front ends have
 790    different implementations.  Used in c-common.c.  */
 791 extern tree lookup_label (tree);
 792 extern tree lookup_name (tree);
 793
 794 extern int vector_types_convertible_p (tree t1, tree t2);
 795
 796 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 797
 798 extern tree c_staticp (tree);
 799
 800 extern void init_c_lex (void);
 801
 802 extern void c_cpp_builtins (cpp_reader *);
 803
 804 /* Positive if an implicit `extern "C"' scope has just been entered;
 805    negative if such a scope has just been exited.  */
 806 extern GTY(()) int pending_lang_change;
 807
 808 /* Information recorded about each file examined during compilation.  */
 809
 810 struct c_fileinfo
 811 {
 812   int time;     /* Time spent in the file.  */
 813
 814   /* Flags used only by C++.
 815      INTERFACE_ONLY nonzero means that we are in an "interface" section
 816      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 817      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 818      INTERFACE_ONLY is zero, it means that we are responsible for
 819      exporting definitions that others might need.  */
 820   short interface_only;
 821   short interface_unknown;
 822 };
 823
 824 struct c_fileinfo *get_fileinfo (const char *);
 825 extern void dump_time_statistics (void);
 826
 827 extern bool c_dump_tree (void *, tree);
 828
 829 extern void c_warn_unused_result (tree *);
 830
 831 extern void verify_sequence_points (tree);
 832
 833 extern tree fold_offsetof (tree, tree);
 834
 835 /* Places where an lvalue, or modifiable lvalue, may be required.
 836    Used to select diagnostic messages in lvalue_error and
 837    readonly_error.  */
 838 enum lvalue_use {
 839   lv_assign,
 840   lv_increment,
 841   lv_decrement,
 842   lv_addressof,
 843   lv_asm
 844 };
 845
 846 extern void lvalue_error (enum lvalue_use);
 847
 848 extern int complete_array_type (tree *, tree, bool);
 849
 850 extern tree builtin_type_for_size (int, bool);
 851
 852 extern void warn_array_subscript_with_type_char (tree);
 853
 854 /* In c-gimplify.c  */
 855 extern void c_genericize (tree);
 856 extern int c_gimplify_expr (tree *, tree *, tree *);
 857 extern tree c_build_bind_expr (tree, tree);
 858
 859 /* In c-pch.c  */
 860 extern void pch_init (void);
 861 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 862 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 863                                const char *orig);
 864 extern void c_common_write_pch (void);
 865 extern void c_common_no_more_pch (void);
 866 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
 867 extern void c_common_print_pch_checksum (FILE *f);
 868
 869 /* In *-checksum.c */
 870 extern const unsigned char executable_checksum[16];
 871
 872 extern void builtin_define_with_value (const char *, const char *, int);
 873 extern void c_stddef_cpp_builtins (void);
 874 extern void fe_file_change (const struct line_map *);
 875 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 876
 877 /* Objective-C / Objective-C++ entry points.  */
 878
 879 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 880    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 881 extern tree objc_is_class_name (tree);
 882 extern tree objc_is_object_ptr (tree);
 883 extern void objc_check_decl (tree);
 884 extern int objc_is_reserved_word (tree);
 885 extern bool objc_compare_types (tree, tree, int, tree);
 886 extern void objc_volatilize_decl (tree);
 887 extern bool objc_type_quals_match (tree, tree);
 888 extern tree objc_rewrite_function_call (tree, tree);
 889 extern tree objc_message_selector (void);
 890 extern tree objc_lookup_ivar (tree, tree);
 891 extern void objc_clear_super_receiver (void);
 892 extern int objc_is_public (tree, tree);
 893 extern tree objc_is_id (tree);
 894 extern void objc_declare_alias (tree, tree);
 895 extern void objc_declare_class (tree);
 896 extern void objc_declare_protocols (tree);
 897 extern tree objc_build_message_expr (tree);
 898 extern tree objc_finish_message_expr (tree, tree, tree);
 899 extern tree objc_build_selector_expr (tree);
 900 extern tree objc_build_protocol_expr (tree);
 901 extern tree objc_build_encode_expr (tree);
 902 extern tree objc_build_string_object (tree);
 903 extern tree objc_get_protocol_qualified_type (tree, tree);
 904 extern tree objc_get_class_reference (tree);
 905 extern tree objc_get_class_ivars (tree);
 906 extern void objc_start_class_interface (tree, tree, tree);
 907 extern void objc_start_category_interface (tree, tree, tree);
 908 extern void objc_start_protocol (tree, tree);
 909 extern void objc_continue_interface (void);
 910 extern void objc_finish_interface (void);
 911 extern void objc_start_class_implementation (tree, tree);
 912 extern void objc_start_category_implementation (tree, tree);
 913 extern void objc_continue_implementation (void);
 914 extern void objc_finish_implementation (void);
 915 extern void objc_set_visibility (int);
 916 extern void objc_set_method_type (enum tree_code);
 917 extern tree objc_build_method_signature (tree, tree, tree, bool);
 918 extern void objc_add_method_declaration (tree);
 919 extern void objc_start_method_definition (tree);
 920 extern void objc_finish_method_definition (tree);
 921 extern void objc_add_instance_variable (tree);
 922 extern tree objc_build_keyword_decl (tree, tree, tree);
 923 extern tree objc_build_throw_stmt (tree);
 924 extern void objc_begin_try_stmt (location_t, tree);
 925 extern tree objc_finish_try_stmt (void);
 926 extern void objc_begin_catch_clause (tree);
 927 extern void objc_finish_catch_clause (void);
 928 extern void objc_build_finally_clause (location_t, tree);
 929 extern tree objc_build_synchronized (location_t, tree, tree);
 930 extern int objc_static_init_needed_p (void);
 931 extern tree objc_generate_static_init_call (tree);
 932 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
 933
 934 /* The following are provided by the C and C++ front-ends, and called by
 935    ObjC/ObjC++.  */
 936 extern void *objc_get_current_scope (void);
 937 extern void objc_mark_locals_volatile (void *);
 938
 939 /* In c-ppoutput.c  */
 940 extern void init_pp_output (FILE *);
 941 extern void preprocess_file (cpp_reader *);
 942 extern void pp_file_change (const struct line_map *);
 943 extern void pp_dir_change (cpp_reader *, const char *);
 944 extern bool check_missing_format_attribute (tree, tree);
 945
 946 /* In c-omp.c  */
 947 extern tree c_finish_omp_master (tree);
 948 extern tree c_finish_omp_critical (tree, tree);
 949 extern tree c_finish_omp_ordered (tree);
 950 extern void c_finish_omp_barrier (void);
 951 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
 952 extern void c_finish_omp_flush (void);
 953 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
 954 extern void c_split_parallel_clauses (tree, tree *, tree *);
 955 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
 956
 957 /* Not in c-omp.c; provided by the front end.  */
 958 extern bool c_omp_sharing_predetermined (tree);
 959 extern tree c_omp_remap_decl (tree, bool);
 960
 961 /* In order for the format checking to accept the C frontend
 962    diagnostic framework extensions, you must include this file before
 963    toplev.h, not after.  The C front end formats are a subset of those
 964    for C++, so they are the appropriate set to use in common code;
 965    cp-tree.h overrides this for C++.  */
 966 #ifndef GCC_DIAG_STYLE
 967 #define GCC_DIAG_STYLE __gcc_cdiag__
 968 #endif
 969
 970 #endif /* ! GCC_C_COMMON_H */