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 extern tree pushdecl_top_level (tree);
 300 extern tree pushdecl (tree);
 301 extern tree build_modify_expr (tree, enum tree_code, tree);
 302 extern tree build_indirect_ref (tree, const char *);
 303
 304 extern int c_expand_decl (tree);
 305
 306 extern int field_decl_cmp (const void *, const void *);
 307 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 308                                   void *);
 309 extern bool has_c_linkage (tree decl);
 310 \f
 311 /* Switches common to the C front ends.  */
 312
 313 /* Nonzero if prepreprocessing only.  */
 314
 315 extern int flag_preprocess_only;
 316
 317 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 318    calls will be used in ObjC; passing nil receivers to such calls
 319    will most likely result in crashes.  */
 320 extern int flag_nil_receivers;
 321
 322 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 323    @try, etc.) in source code.  */
 324 extern int flag_objc_exceptions;
 325
 326 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 327 extern int flag_objc_sjlj_exceptions;
 328
 329 /* Nonzero means that code generation will be altered to support
 330    "zero-link" execution.  This currently affects ObjC only, but may
 331    affect other languages in the future.  */
 332 extern int flag_zero_link;
 333
 334 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 335    unit.  It will inform the ObjC runtime that class definition(s) herein
 336    contained are to replace one(s) previously loaded.  */
 337 extern int flag_replace_objc_classes;
 338
 339 /* Nonzero means don't output line number information.  */
 340
 341 extern char flag_no_line_commands;
 342
 343 /* Nonzero causes -E output not to be done, but directives such as
 344    #define that have side effects are still obeyed.  */
 345
 346 extern char flag_no_output;
 347
 348 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 349    'N' of the command line switch.  */
 350
 351 extern char flag_dump_macros;
 352
 353 /* Nonzero means pass #include lines through to the output.  */
 354
 355 extern char flag_dump_includes;
 356
 357 /* Nonzero means process PCH files while preprocessing.  */
 358
 359 extern bool flag_pch_preprocess;
 360
 361 /* The file name to which we should write a precompiled header, or
 362    NULL if no header will be written in this compile.  */
 363
 364 extern const char *pch_file;
 365
 366 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 367    user's namespace.  */
 368
 369 extern int flag_iso;
 370
 371 /* Nonzero if -undef was given.  It suppresses target built-in macros
 372    and assertions.  */
 373
 374 extern int flag_undef;
 375
 376 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 377
 378 extern int flag_no_builtin;
 379
 380 /* Nonzero means don't recognize the non-ANSI builtin functions.
 381    -ansi sets this.  */
 382
 383 extern int flag_no_nonansi_builtin;
 384
 385 /* Nonzero means give `double' the same size as `float'.  */
 386
 387 extern int flag_short_double;
 388
 389 /* Nonzero means give `wchar_t' the same size as `short'.  */
 390
 391 extern int flag_short_wchar;
 392
 393 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 394 extern int flag_ms_extensions;
 395
 396 /* Nonzero means don't recognize the keyword `asm'.  */
 397
 398 extern int flag_no_asm;
 399
 400 /* Nonzero means give string constants the type `const char *', as mandated
 401    by the standard.  */
 402
 403 extern int flag_const_strings;
 404
 405 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 406
 407 extern int flag_signed_bitfields;
 408
 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 to use __cxa_get_exception_ptr in the C++ exception-handling
 553    logic.  */
 554
 555 extern int flag_use_cxa_get_exception_ptr;
 556
 557 /* Nonzero means make the default pedwarns warnings instead of errors.
 558    The value of this flag is ignored if -pedantic is specified.  */
 559
 560 extern int flag_permissive;
 561
 562 /* Nonzero means to implement standard semantics for exception
 563    specifications, calling unexpected if an exception is thrown that
 564    doesn't match the specification.  Zero means to treat them as
 565    assertions and optimize accordingly, but not check them.  */
 566
 567 extern int flag_enforce_eh_specs;
 568
 569 /* Nonzero (the default) means to generate thread-safe code for
 570    initializing local statics.  */
 571
 572 extern int flag_threadsafe_statics;
 573
 574 /* Nonzero means warn about implicit declarations.  */
 575
 576 extern int warn_implicit;
 577
 578 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 579    with GCC this doesn't matter as __null is guaranteed to have the right
 580    size.  */
 581
 582 extern int warn_strict_null_sentinel;
 583
 584 /* Maximum template instantiation depth.  This limit is rather
 585    arbitrary, but it exists to limit the time it takes to notice
 586    infinite template instantiations.  */
 587
 588 extern int max_tinst_depth;
 589
 590 /* Nonzero means the expression being parsed will never be evaluated.
 591    This is a count, since unevaluated expressions can nest.  */
 592
 593 extern int skip_evaluation;
 594
 595 /* C types are partitioned into three subsets: object, function, and
 596    incomplete types.  */
 597 #define C_TYPE_OBJECT_P(type) \
 598   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 599
 600 #define C_TYPE_INCOMPLETE_P(type) \
 601   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 602
 603 #define C_TYPE_FUNCTION_P(type) \
 604   (TREE_CODE (type) == FUNCTION_TYPE)
 605
 606 /* For convenience we define a single macro to identify the class of
 607    object or incomplete types.  */
 608 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 609   (!C_TYPE_FUNCTION_P (type))
 610
 611 /* Attribute table common to the C front ends.  */
 612 extern const struct attribute_spec c_common_attribute_table[];
 613 extern const struct attribute_spec c_common_format_attribute_table[];
 614
 615 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 616    ID is the identifier to use, NAME is the string.
 617    TYPE_DEP indicates whether it depends on type of the function or not
 618    (i.e. __PRETTY_FUNCTION__).  */
 619
 620 extern tree (*make_fname_decl) (tree, int);
 621
 622 extern tree identifier_global_value (tree);
 623 extern void record_builtin_type (enum rid, const char *, tree);
 624 extern tree build_void_list_node (void);
 625 extern void start_fname_decls (void);
 626 extern void finish_fname_decls (void);
 627 extern const char *fname_as_string (int);
 628 extern tree fname_decl (unsigned, tree);
 629
 630 extern void check_function_arguments (tree, tree, tree);
 631 extern void check_function_arguments_recurse (void (*)
 632                                               (void *, tree,
 633                                                unsigned HOST_WIDE_INT),
 634                                               void *, tree,
 635                                               unsigned HOST_WIDE_INT);
 636 extern void check_function_format (tree, tree);
 637 extern void set_Wformat (int);
 638 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 639 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 640 extern int c_common_handle_option (size_t code, const char *arg, int value);
 641 extern bool c_common_missing_argument (const char *opt, size_t code);
 642 extern tree c_common_type_for_mode (enum machine_mode, int);
 643 extern tree c_common_type_for_size (unsigned int, int);
 644 extern tree c_common_unsigned_type (tree);
 645 extern tree c_common_signed_type (tree);
 646 extern tree c_common_signed_or_unsigned_type (int, tree);
 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 void unsigned_conversion_warning (tree, tree);
 662 extern bool c_determine_visibility (tree);
 663 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 664
 665 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 666 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 667
 668 /* Subroutine of build_binary_op, used for comparison operations.
 669    See if the operands have both been converted from subword integer types
 670    and, if so, perhaps change them both back to their original type.  */
 671 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 672
 673 extern tree pointer_int_sum (enum tree_code, tree, tree);
 674 extern unsigned int min_precision (tree, int);
 675
 676 /* Add qualifiers to a type, in the fashion for C.  */
 677 extern tree c_build_qualified_type (tree, int);
 678
 679 /* Build tree nodes and builtin functions common to both C and C++ language
 680    frontends.  */
 681 extern void c_common_nodes_and_builtins (void);
 682
 683 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 684
 685 extern void disable_builtin_function (const char *);
 686
 687 extern void set_compound_literal_name (tree decl);
 688
 689 extern tree build_va_arg (tree, tree);
 690
 691 extern unsigned int c_common_init_options (unsigned int, const char **);
 692 extern bool c_common_post_options (const char **);
 693 extern bool c_common_init (void);
 694 extern void c_common_finish (void);
 695 extern void c_common_parse_file (int);
 696 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 697 extern void c_register_builtin_type (tree, const char*);
 698 extern bool c_promoting_integer_type_p (tree);
 699 extern int self_promoting_args_p (tree);
 700 extern tree strip_array_types (tree);
 701 extern tree strip_pointer_operator (tree);
 702 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 703
 704 /* This is the basic parsing function.  */
 705 extern void c_parse_file (void);
 706 /* This is misnamed, it actually performs end-of-compilation processing.  */
 707 extern void finish_file (void);
 708
 709
 710 /* These macros provide convenient access to the various _STMT nodes.  */
 711
 712 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 713    if a statement expression.  */
 714 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 715   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 716
 717 /* Nonzero if a label has been added to the statement list.  */
 718 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 719   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 720
 721 /* COMPOUND_LITERAL_EXPR accessors.  */
 722 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 723   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 724 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 725   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 726
 727 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 728
 729 enum c_tree_code {
 730   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 731 #include "c-common.def"
 732   LAST_C_TREE_CODE
 733 };
 734
 735 #undef DEFTREECODE
 736
 737 extern int anon_aggr_type_p (tree);
 738
 739 /* For a VAR_DECL that is an anonymous union, these are the various
 740    sub-variables that make up the anonymous union.  */
 741 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 742
 743 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 744 #define DECL_C_BIT_FIELD(NODE) \
 745   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 746 #define SET_DECL_C_BIT_FIELD(NODE) \
 747   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 748 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 749   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 750
 751 extern void emit_local_var (tree);
 752 extern tree do_case (tree, tree);
 753 extern tree build_stmt (enum tree_code, ...);
 754 extern tree build_case_label (tree, tree, tree);
 755
 756 /* These functions must be defined by each front-end which implements
 757    a variant of the C language.  They are used in c-common.c.  */
 758
 759 extern tree build_unary_op (enum tree_code, tree, int);
 760 extern tree build_binary_op (enum tree_code, tree, tree, int);
 761 extern tree perform_integral_promotions (tree);
 762
 763 /* Given two integer or real types, return the type for their sum.
 764    Given two compatible ANSI C types, returns the merged type.  */
 765
 766 extern tree common_type (tree, tree);
 767
 768 extern tree decl_constant_value (tree);
 769
 770 /* Handle increment and decrement of boolean types.  */
 771 extern tree boolean_increment (enum tree_code, tree);
 772
 773 extern int case_compare (splay_tree_key, splay_tree_key);
 774
 775 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 776
 777 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 778
 779 extern tree build_function_call (tree, tree);
 780
 781 extern tree resolve_overloaded_builtin (tree, tree);
 782
 783 extern tree finish_label_address_expr (tree);
 784
 785 /* Same function prototype, but the C and C++ front ends have
 786    different implementations.  Used in c-common.c.  */
 787 extern tree lookup_label (tree);
 788 extern tree lookup_name (tree);
 789
 790 extern int vector_types_convertible_p (tree t1, tree t2);
 791
 792 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 793
 794 extern tree c_staticp (tree);
 795
 796 extern void init_c_lex (void);
 797
 798 extern void c_cpp_builtins (cpp_reader *);
 799
 800 /* Positive if an implicit `extern "C"' scope has just been entered;
 801    negative if such a scope has just been exited.  */
 802 extern GTY(()) int pending_lang_change;
 803
 804 /* Information recorded about each file examined during compilation.  */
 805
 806 struct c_fileinfo
 807 {
 808   int time;     /* Time spent in the file.  */
 809
 810   /* Flags used only by C++.
 811      INTERFACE_ONLY nonzero means that we are in an "interface" section
 812      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 813      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 814      INTERFACE_ONLY is zero, it means that we are responsible for
 815      exporting definitions that others might need.  */
 816   short interface_only;
 817   short interface_unknown;
 818 };
 819
 820 struct c_fileinfo *get_fileinfo (const char *);
 821 extern void dump_time_statistics (void);
 822
 823 extern bool c_dump_tree (void *, tree);
 824
 825 extern void c_warn_unused_result (tree *);
 826
 827 extern void verify_sequence_points (tree);
 828
 829 extern tree fold_offsetof (tree);
 830
 831 /* Places where an lvalue, or modifiable lvalue, may be required.
 832    Used to select diagnostic messages in lvalue_error and
 833    readonly_error.  */
 834 enum lvalue_use {
 835   lv_assign,
 836   lv_increment,
 837   lv_decrement,
 838   lv_addressof,
 839   lv_asm
 840 };
 841
 842 extern void lvalue_error (enum lvalue_use);
 843
 844 extern int complete_array_type (tree *, tree, bool);
 845
 846 extern tree builtin_type_for_size (int, bool);
 847
 848 extern void warn_array_subscript_with_type_char (tree);
 849
 850 /* In c-gimplify.c  */
 851 extern void c_genericize (tree);
 852 extern int c_gimplify_expr (tree *, tree *, tree *);
 853 extern tree c_build_bind_expr (tree, tree);
 854
 855 /* In c-pch.c  */
 856 extern void pch_init (void);
 857 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 858 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 859                                const char *orig);
 860 extern void c_common_write_pch (void);
 861 extern void c_common_no_more_pch (void);
 862 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
 863 extern void c_common_print_pch_checksum (FILE *f);
 864
 865 /* In *-checksum.c */
 866 extern const unsigned char executable_checksum[16];
 867
 868 extern void builtin_define_with_value (const char *, const char *, int);
 869 extern void c_stddef_cpp_builtins (void);
 870 extern void fe_file_change (const struct line_map *);
 871 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 872
 873 /* Objective-C / Objective-C++ entry points.  */
 874
 875 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 876    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 877 extern tree objc_is_class_name (tree);
 878 extern tree objc_is_object_ptr (tree);
 879 extern void objc_check_decl (tree);
 880 extern int objc_is_reserved_word (tree);
 881 extern bool objc_compare_types (tree, tree, int, tree);
 882 extern void objc_volatilize_decl (tree);
 883 extern bool objc_type_quals_match (tree, tree);
 884 extern tree objc_rewrite_function_call (tree, tree);
 885 extern tree objc_message_selector (void);
 886 extern tree objc_lookup_ivar (tree, tree);
 887 extern void objc_clear_super_receiver (void);
 888 extern int objc_is_public (tree, tree);
 889 extern tree objc_is_id (tree);
 890 extern void objc_declare_alias (tree, tree);
 891 extern void objc_declare_class (tree);
 892 extern void objc_declare_protocols (tree);
 893 extern tree objc_build_message_expr (tree);
 894 extern tree objc_finish_message_expr (tree, tree, tree);
 895 extern tree objc_build_selector_expr (tree);
 896 extern tree objc_build_protocol_expr (tree);
 897 extern tree objc_build_encode_expr (tree);
 898 extern tree objc_build_string_object (tree);
 899 extern tree objc_get_protocol_qualified_type (tree, tree);
 900 extern tree objc_get_class_reference (tree);
 901 extern tree objc_get_class_ivars (tree);
 902 extern void objc_start_class_interface (tree, tree, tree);
 903 extern void objc_start_category_interface (tree, tree, tree);
 904 extern void objc_start_protocol (tree, tree);
 905 extern void objc_continue_interface (void);
 906 extern void objc_finish_interface (void);
 907 extern void objc_start_class_implementation (tree, tree);
 908 extern void objc_start_category_implementation (tree, tree);
 909 extern void objc_continue_implementation (void);
 910 extern void objc_finish_implementation (void);
 911 extern void objc_set_visibility (int);
 912 extern void objc_set_method_type (enum tree_code);
 913 extern tree objc_build_method_signature (tree, tree, tree, bool);
 914 extern void objc_add_method_declaration (tree);
 915 extern void objc_start_method_definition (tree);
 916 extern void objc_finish_method_definition (tree);
 917 extern void objc_add_instance_variable (tree);
 918 extern tree objc_build_keyword_decl (tree, tree, tree);
 919 extern tree objc_build_throw_stmt (tree);
 920 extern void objc_begin_try_stmt (location_t, tree);
 921 extern tree objc_finish_try_stmt (void);
 922 extern void objc_begin_catch_clause (tree);
 923 extern void objc_finish_catch_clause (void);
 924 extern void objc_build_finally_clause (location_t, tree);
 925 extern tree objc_build_synchronized (location_t, tree, tree);
 926 extern int objc_static_init_needed_p (void);
 927 extern tree objc_generate_static_init_call (tree);
 928 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
 929
 930 /* The following are provided by the C and C++ front-ends, and called by
 931    ObjC/ObjC++.  */
 932 extern void *objc_get_current_scope (void);
 933 extern void objc_mark_locals_volatile (void *);
 934
 935 /* In c-ppoutput.c  */
 936 extern void init_pp_output (FILE *);
 937 extern void preprocess_file (cpp_reader *);
 938 extern void pp_file_change (const struct line_map *);
 939 extern void pp_dir_change (cpp_reader *, const char *);
 940 extern bool check_missing_format_attribute (tree, tree);
 941
 942 /* In c-omp.c  */
 943 extern tree c_finish_omp_master (tree);
 944 extern tree c_finish_omp_critical (tree, tree);
 945 extern tree c_finish_omp_ordered (tree);
 946 extern void c_finish_omp_barrier (void);
 947 extern void c_finish_omp_atomic (enum tree_code, tree, tree);
 948 extern void c_finish_omp_flush (void);
 949 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
 950 extern void c_split_parallel_clauses (tree, tree *, tree *);
 951 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
 952
 953 /* Not in c-omp.c; provided by the front end.  */
 954 extern bool c_omp_sharing_predetermined (tree);
 955 extern tree c_omp_remap_decl (tree, bool);
 956
 957 /* In order for the format checking to accept the C frontend
 958    diagnostic framework extensions, you must include this file before
 959    toplev.h, not after.  The C front end formats are a subset of those
 960    for C++, so they are the appropriate set to use in common code;
 961    cp-tree.h overrides this for C++.  */
 962 #ifndef GCC_DIAG_STYLE
 963 #define GCC_DIAG_STYLE __gcc_cdiag__
 964 #endif
 965
 966 #endif /* ! GCC_C_COMMON_H */