gcc/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_C_COMMON_H
  23 #define GCC_C_COMMON_H
  24
  25 #include "splay-tree.h"
  26 #include "cpplib.h"
  27 #include "ggc.h"
  28
  29 /* Usage of TREE_LANG_FLAG_?:
  30    0: TREE_NEGATED_INT (in INTEGER_CST).
  31       IDENTIFIER_MARKED (used by search routines).
  32       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  33       STMT_EXPR_NO_SCOPE (in STMT_EXPR)
  34    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  35       STMT_IS_FULL_EXPR_P (in _STMT)
  36       STATEMENT_LIST_STMT_EXPR (in STATEMENT_LIST)
  37    2: unused
  38    3: unused
  39    4: unused
  40 */
  41
  42 /* Reserved identifiers.  This is the union of all the keywords for C,
  43    C++, and Objective-C.  All the type modifiers have to be in one
  44    block at the beginning, because they are used as mask bits.  There
  45    are 27 type modifiers; if we add many more we will have to redesign
  46    the mask mechanism.  */
  47
  48 enum rid
  49 {
  50   /* Modifiers: */
  51   /* C, in empirical order of frequency.  */
  52   RID_STATIC = 0,
  53   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  54   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  55   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  56
  57   /* C extensions */
  58   RID_COMPLEX, RID_THREAD,
  59
  60   /* C++ */
  61   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  62
  63   /* ObjC */
  64   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  65
  66   /* C */
  67   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  68   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  69   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  70   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  71   RID_SIZEOF,
  72
  73   /* C extensions */
  74   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  75   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_PTRBASE,
  76   RID_PTREXTENT, RID_PTRVALUE, RID_CHOOSE_EXPR, RID_TYPES_COMPATIBLE_P,
  77
  78   /* Too many ways of getting the name of a function as a string */
  79   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  80
  81   /* C++ */
  82   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  83   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  84   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  85   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  86   RID_NEW,      RID_OFFSETOF, RID_OPERATOR,
  87   RID_THIS,     RID_THROW,    RID_TRUE,
  88   RID_TRY,      RID_TYPENAME, RID_TYPEID,
  89   RID_USING,
  90
  91   /* casts */
  92   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  93
  94   /* Objective-C */
  95   RID_ID,          RID_AT_ENCODE,    RID_AT_END,
  96   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
  97   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
  98   RID_AT_PROTOCOL, RID_AT_SELECTOR,
  99   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 100   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 101   RID_AT_INTERFACE,
 102   RID_AT_IMPLEMENTATION,
 103
 104   RID_MAX,
 105
 106   RID_FIRST_MODIFIER = RID_STATIC,
 107   RID_LAST_MODIFIER = RID_ONEWAY,
 108
 109   RID_FIRST_AT = RID_AT_ENCODE,
 110   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 111   RID_FIRST_PQ = RID_IN,
 112   RID_LAST_PQ = RID_ONEWAY
 113 };
 114
 115 #define OBJC_IS_AT_KEYWORD(rid) \
 116   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 117    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 118
 119 #define OBJC_IS_PQ_KEYWORD(rid) \
 120   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 121    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 122
 123 /* The elements of `ridpointers' are identifier nodes for the reserved
 124    type names and storage classes.  It is indexed by a RID_... value.  */
 125 extern GTY ((length ("(int)RID_MAX"))) tree *ridpointers;
 126
 127 /* Standard named or nameless data types of the C compiler.  */
 128
 129 enum c_tree_index
 130 {
 131     CTI_WCHAR_TYPE,
 132     CTI_SIGNED_WCHAR_TYPE,
 133     CTI_UNSIGNED_WCHAR_TYPE,
 134     CTI_WINT_TYPE,
 135     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 136     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 137     CTI_INTMAX_TYPE,
 138     CTI_UINTMAX_TYPE,
 139     CTI_WIDEST_INT_LIT_TYPE,
 140     CTI_WIDEST_UINT_LIT_TYPE,
 141
 142     CTI_CHAR_ARRAY_TYPE,
 143     CTI_WCHAR_ARRAY_TYPE,
 144     CTI_INT_ARRAY_TYPE,
 145     CTI_STRING_TYPE,
 146     CTI_CONST_STRING_TYPE,
 147
 148     /* Type for boolean expressions (bool in C++, int in C).  */
 149     CTI_TRUTHVALUE_TYPE,
 150     CTI_TRUTHVALUE_TRUE,
 151     CTI_TRUTHVALUE_FALSE,
 152
 153     CTI_DEFAULT_FUNCTION_TYPE,
 154
 155     /* These are not types, but we have to look them up all the time.  */
 156     CTI_FUNCTION_NAME_DECL,
 157     CTI_PRETTY_FUNCTION_NAME_DECL,
 158     CTI_C99_FUNCTION_NAME_DECL,
 159     CTI_SAVED_FUNCTION_NAME_DECLS,
 160
 161     CTI_VOID_ZERO,
 162
 163     CTI_MAX
 164 };
 165
 166 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 167
 168 /* Identifier part common to the C front ends.  Inherits from
 169    tree_identifier, despite appearances.  */
 170 struct c_common_identifier GTY(())
 171 {
 172   struct tree_common common;
 173   struct cpp_hashnode node;
 174 };
 175
 176 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 177 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 178 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 179 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 180 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 181 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 182 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 183 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 184 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 185 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 186
 187 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 188 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 189 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 190
 191 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 192 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 193 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 194 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 195 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 196
 197 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 198
 199 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 200 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 201 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 202 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 203
 204 /* A node for `((void) 0)'.  */
 205 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 206
 207 extern GTY(()) tree c_global_trees[CTI_MAX];
 208
 209 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 210    tree for size reasons.  */
 211 struct sorted_fields_type GTY(())
 212 {
 213   int len;
 214   tree GTY((length ("%h.len"))) elts[1];
 215 };
 216
 217 /* Mark which labels are explicitly declared.
 218    These may be shadowed, and may be referenced from nested functions.  */
 219 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 220
 221 /* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
 222    warning if they undergo concatenation.  */
 223 #define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
 224
 225 typedef enum c_language_kind
 226 {
 227   clk_c         = 0,            /* C90, C94 or C99 */
 228   clk_objc      = 1,            /* clk_c with ObjC features.  */
 229   clk_cxx       = 2,            /* ANSI/ISO C++ */
 230   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 231 }
 232 c_language_kind;
 233
 234 /* To test for a specific language use c_language, defined by each
 235    front end.  For "ObjC features" or "not C++" use the macros.  */
 236 extern c_language_kind c_language;
 237
 238 #define c_dialect_cxx()         (c_language & clk_cxx)
 239 #define c_dialect_objc()        (c_language & clk_objc)
 240
 241 /* Information about a statement tree.  */
 242
 243 struct stmt_tree_s GTY(()) {
 244   /* The current statment list being collected.  */
 245   tree x_cur_stmt_list;
 246
 247   /* In C++, Nonzero if we should treat statements as full
 248      expressions.  In particular, this variable is no-zero if at the
 249      end of a statement we should destroy any temporaries created
 250      during that statement.  Similarly, if, at the end of a block, we
 251      should destroy any local variables in this block.  Normally, this
 252      variable is nonzero, since those are the normal semantics of
 253      C++.
 254
 255      However, in order to represent aggregate initialization code as
 256      tree structure, we use statement-expressions.  The statements
 257      within the statement expression should not result in cleanups
 258      being run until the entire enclosing statement is complete.
 259
 260      This flag has no effect in C.  */
 261   int stmts_are_full_exprs_p;
 262 };
 263
 264 typedef struct stmt_tree_s *stmt_tree;
 265
 266 /* Global state pertinent to the current function.  Some C dialects
 267    extend this structure with additional fields.  */
 268
 269 struct c_language_function GTY(()) {
 270   /* While we are parsing the function, this contains information
 271      about the statement-tree that we are building.  */
 272   struct stmt_tree_s x_stmt_tree;
 273 };
 274
 275 /* When building a statement-tree, this is the current statment list
 276    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 277    statment list.  */
 278
 279 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 280
 281 /* Language-specific hooks.  */
 282
 283 extern void (*lang_expand_function_end) (void);
 284
 285 /* Callback that determines if it's ok for a function to have no
 286    noreturn attribute.  */
 287 extern int (*lang_missing_noreturn_ok_p) (tree);
 288
 289 extern void push_file_scope (void);
 290 extern void pop_file_scope (void);
 291 extern int yyparse (void);
 292 extern stmt_tree current_stmt_tree (void);
 293 extern tree push_stmt_list (void);
 294 extern tree re_push_stmt_list (tree);
 295 extern tree pop_stmt_list (tree);
 296 extern tree add_stmt (tree);
 297 extern void push_cleanup (tree, tree, bool);
 298
 299 extern tree walk_stmt_tree (tree *, walk_tree_fn, void *);
 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 extern int explicit_flag_signed_bitfields;
 405
 406 /* Nonzero means warn about deprecated conversion from string constant to
 407    `char *'.  */
 408
 409 extern int warn_write_strings;
 410
 411 /* Warn about #pragma directives that are not recognized.  */
 412
 413 extern int warn_unknown_pragmas; /* Tri state variable.  */
 414
 415 /* Warn about format/argument anomalies in calls to formatted I/O functions
 416    (*printf, *scanf, strftime, strfmon, etc.).  */
 417
 418 extern int warn_format;
 419
 420
 421 /* C/ObjC language option variables.  */
 422
 423
 424 /* Nonzero means allow type mismatches in conditional expressions;
 425    just make their values `void'.  */
 426
 427 extern int flag_cond_mismatch;
 428
 429 /* Nonzero means enable C89 Amendment 1 features.  */
 430
 431 extern int flag_isoc94;
 432
 433 /* Nonzero means use the ISO C99 dialect of C.  */
 434
 435 extern int flag_isoc99;
 436
 437 /* Nonzero means that we have builtin functions, and main is an int.  */
 438
 439 extern int flag_hosted;
 440
 441 /* Warn if main is suspicious.  */
 442
 443 extern int warn_main;
 444
 445
 446 /* ObjC language option variables.  */
 447
 448
 449 /* Open and close the file for outputting class declarations, if
 450    requested (ObjC).  */
 451
 452 extern int flag_gen_declaration;
 453
 454 /* Generate code for GNU or NeXT runtime environment.  */
 455
 456 extern int flag_next_runtime;
 457
 458 /* Tells the compiler that this is a special run.  Do not perform any
 459    compiling, instead we are to test some platform dependent features
 460    and output a C header file with appropriate definitions.  */
 461
 462 extern int print_struct_values;
 463
 464 /* ???.  Undocumented.  */
 465
 466 extern const char *constant_string_class_name;
 467
 468
 469 /* C++ language option variables.  */
 470
 471
 472 /* Nonzero means don't recognize any extension keywords.  */
 473
 474 extern int flag_no_gnu_keywords;
 475
 476 /* Nonzero means do emit exported implementations of functions even if
 477    they can be inlined.  */
 478
 479 extern int flag_implement_inlines;
 480
 481 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 482
 483 extern int flag_implicit_templates;
 484
 485 /* Nonzero means that implicit instantiations of inline templates will be
 486    emitted if needed, even if instantiations of non-inline templates
 487    aren't.  */
 488
 489 extern int flag_implicit_inline_templates;
 490
 491 /* Nonzero means generate separate instantiation control files and
 492    juggle them at link time.  */
 493
 494 extern int flag_use_repository;
 495
 496 /* Nonzero if we want to issue diagnostics that the standard says are not
 497    required.  */
 498
 499 extern int flag_optional_diags;
 500
 501 /* Nonzero means we should attempt to elide constructors when possible.  */
 502
 503 extern int flag_elide_constructors;
 504
 505 /* Nonzero means that member functions defined in class scope are
 506    inline by default.  */
 507
 508 extern int flag_default_inline;
 509
 510 /* Controls whether compiler generates 'type descriptor' that give
 511    run-time type information.  */
 512
 513 extern int flag_rtti;
 514
 515 /* Nonzero if we want to conserve space in the .o files.  We do this
 516    by putting uninitialized data and runtime initialized data into
 517    .common instead of .data at the expense of not flagging multiple
 518    definitions.  */
 519
 520 extern int flag_conserve_space;
 521
 522 /* Nonzero if we want to obey access control semantics.  */
 523
 524 extern int flag_access_control;
 525
 526 /* Nonzero if we want to check the return value of new and avoid calling
 527    constructors if it is a null pointer.  */
 528
 529 extern int flag_check_new;
 530
 531 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 532    initialization variables.
 533    0: Old rules, set by -fno-for-scope.
 534    2: New ISO rules, set by -ffor-scope.
 535    1: Try to implement new ISO rules, but with backup compatibility
 536    (and warnings).  This is the default, for now.  */
 537
 538 extern int flag_new_for_scope;
 539
 540 /* Nonzero if we want to emit defined symbols with common-like linkage as
 541    weak symbols where possible, in order to conform to C++ semantics.
 542    Otherwise, emit them as local symbols.  */
 543
 544 extern int flag_weak;
 545
 546 /* 0 means we want the preprocessor to not emit line directives for
 547    the current working directory.  1 means we want it to do it.  -1
 548    means we should decide depending on whether debugging information
 549    is being emitted or not.  */
 550
 551 extern int flag_working_directory;
 552
 553 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 554    destructors for local statics and global objects.  */
 555
 556 extern int flag_use_cxa_atexit;
 557
 558 /* Nonzero means make the default pedwarns warnings instead of errors.
 559    The value of this flag is ignored if -pedantic is specified.  */
 560
 561 extern int flag_permissive;
 562
 563 /* Nonzero means to implement standard semantics for exception
 564    specifications, calling unexpected if an exception is thrown that
 565    doesn't match the specification.  Zero means to treat them as
 566    assertions and optimize accordingly, but not check them.  */
 567
 568 extern int flag_enforce_eh_specs;
 569
 570 /* Nonzero means warn about implicit declarations.  */
 571
 572 extern int warn_implicit;
 573
 574 /* Maximum template instantiation depth.  This limit is rather
 575    arbitrary, but it exists to limit the time it takes to notice
 576    infinite template instantiations.  */
 577
 578 extern int max_tinst_depth;
 579
 580 /* Nonzero means the expression being parsed will never be evaluated.
 581    This is a count, since unevaluated expressions can nest.  */
 582
 583 extern int skip_evaluation;
 584
 585 /* C types are partitioned into three subsets: object, function, and
 586    incomplete types.  */
 587 #define C_TYPE_OBJECT_P(type) \
 588   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 589
 590 #define C_TYPE_INCOMPLETE_P(type) \
 591   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 592
 593 #define C_TYPE_FUNCTION_P(type) \
 594   (TREE_CODE (type) == FUNCTION_TYPE)
 595
 596 /* For convenience we define a single macro to identify the class of
 597    object or incomplete types.  */
 598 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 599   (!C_TYPE_FUNCTION_P (type))
 600
 601 /* Record in each node resulting from a binary operator
 602    what operator was specified for it.  */
 603 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 604
 605 /* Attribute table common to the C front ends.  */
 606 extern const struct attribute_spec c_common_attribute_table[];
 607 extern const struct attribute_spec c_common_format_attribute_table[];
 608
 609 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 610    ID is the identifier to use, NAME is the string.
 611    TYPE_DEP indicates whether it depends on type of the function or not
 612    (i.e. __PRETTY_FUNCTION__).  */
 613
 614 extern tree (*make_fname_decl) (tree, int);
 615
 616 extern tree identifier_global_value (tree);
 617 extern void record_builtin_type (enum rid, const char *, tree);
 618 extern tree build_void_list_node (void);
 619 extern void start_fname_decls (void);
 620 extern void finish_fname_decls (void);
 621 extern const char *fname_as_string (int);
 622 extern tree fname_decl (unsigned, tree);
 623
 624 extern void check_function_arguments (tree, tree);
 625 extern void check_function_arguments_recurse (void (*)
 626                                               (void *, tree,
 627                                                unsigned HOST_WIDE_INT),
 628                                               void *, tree,
 629                                               unsigned HOST_WIDE_INT);
 630 extern void check_function_format (tree, tree);
 631 extern void set_Wformat (int);
 632 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 633 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 634 extern int c_common_handle_option (size_t code, const char *arg, int value);
 635 extern bool c_common_missing_argument (const char *opt, size_t code);
 636 extern tree c_common_type_for_mode (enum machine_mode, int);
 637 extern tree c_common_type_for_size (unsigned int, int);
 638 extern tree c_common_unsigned_type (tree);
 639 extern tree c_common_signed_type (tree);
 640 extern tree c_common_signed_or_unsigned_type (int, tree);
 641 extern tree c_common_truthvalue_conversion (tree);
 642 extern void c_apply_type_quals_to_decl (int, tree);
 643 extern tree c_sizeof_or_alignof_type (tree, enum tree_code, int);
 644 extern tree c_alignof_expr (tree);
 645 /* Print an error message for invalid operands to arith operation CODE.
 646    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 647 extern void binary_op_error (enum tree_code);
 648 #define my_friendly_assert(EXP, N) (void) \
 649  (((EXP) == 0) ? (fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0) : 0)
 650
 651 /* Validate the expression after `case' and apply default promotions.  */
 652 extern tree check_case_value (tree);
 653 extern tree fix_string_type (tree);
 654 struct varray_head_tag;
 655 extern void constant_expression_warning (tree);
 656 extern tree convert_and_check (tree, tree);
 657 extern void overflow_warning (tree);
 658 extern void unsigned_conversion_warning (tree, tree);
 659
 660 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 1)
 661 #define c_alignof(T) c_sizeof_or_alignof_type (T, ALIGNOF_EXPR, 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 disable_builtin_function (const char *);
 679
 680 extern tree build_va_arg (tree, tree);
 681
 682 extern unsigned int c_common_init_options (unsigned int, const char **);
 683 extern bool c_common_post_options (const char **);
 684 extern bool c_common_init (void);
 685 extern void c_common_finish (void);
 686 extern void c_common_parse_file (int);
 687 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 688 extern void c_register_builtin_type (tree, const char*);
 689 extern bool c_promoting_integer_type_p (tree);
 690 extern int self_promoting_args_p (tree);
 691 extern tree strip_array_types (tree);
 692 extern tree strip_pointer_operator (tree);
 693
 694 /* This is the basic parsing function.  */
 695 extern void c_parse_file (void);
 696 /* This is misnamed, it actually performs end-of-compilation processing.  */
 697 extern void finish_file (void);
 698
 699 /* These macros provide convenient access to the various _STMT nodes.  */
 700
 701 /* Nonzero if this statement should be considered a full-expression,
 702    i.e., if temporaries created during this statement should have
 703    their destructors run at the end of this statement.  (In C, this
 704    will always be false, since there are no destructors.)  */
 705 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 706
 707 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 708    if a statement expression.  */
 709 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 710   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 711
 712 /* WHILE_STMT accessors. These give access to the condition of the
 713    while statement and the body of the while statement, respectively.  */
 714 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 715 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 716
 717 /* DO_STMT accessors. These give access to the condition of the do
 718    statement and the body of the do statement, respectively.  */
 719 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 720 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 721
 722 /* EXPR_STMT accessor. This gives the expression associated with an
 723    expression statement.  */
 724 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 725
 726 /* FOR_STMT accessors. These give access to the init statement,
 727    condition, update expression, and body of the for statement,
 728    respectively.  */
 729 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 730 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 731 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 732 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 733
 734 #define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
 735
 736 /* STMT_EXPR accessor.  */
 737 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 738
 739 /* Nonzero if this statement-expression does not have an associated scope.  */
 740 #define STMT_EXPR_NO_SCOPE(NODE) \
 741    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
 742
 743 /* COMPOUND_LITERAL_EXPR accessors.  */
 744 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 745   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 746 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 747   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 748
 749 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 750
 751 enum c_tree_code {
 752   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 753 #include "c-common.def"
 754   LAST_C_TREE_CODE
 755 };
 756
 757 #undef DEFTREECODE
 758
 759 #define c_common_stmt_codes                             \
 760    EXPR_STMT,           FOR_STMT,                       \
 761    WHILE_STMT,          DO_STMT,                        \
 762    BREAK_STMT,          CONTINUE_STMT,  SWITCH_STMT
 763
 764 /* TRUE if a code represents a statement.  The front end init
 765    langhook should take care of initialization of this array.  */
 766 extern bool statement_code_p[MAX_TREE_CODES];
 767
 768 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
 769
 770 #define INIT_STATEMENT_CODES(STMT_CODES)                        \
 771   do {                                                          \
 772     unsigned int i;                                             \
 773     memset (&statement_code_p, 0, sizeof (statement_code_p));   \
 774     for (i = 0; i < ARRAY_SIZE (STMT_CODES); i++)               \
 775       statement_code_p[STMT_CODES[i]] = true;                   \
 776   } while (0)
 777
 778 extern int stmts_are_full_exprs_p (void);
 779 extern int anon_aggr_type_p (tree);
 780
 781 /* For a VAR_DECL that is an anonymous union, these are the various
 782    sub-variables that make up the anonymous union.  */
 783 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 784
 785 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 786 #define DECL_C_BIT_FIELD(NODE) \
 787   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 788 #define SET_DECL_C_BIT_FIELD(NODE) \
 789   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 790 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 791   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 792
 793 extern void emit_local_var (tree);
 794 extern void make_rtl_for_local_static (tree);
 795 extern tree do_case (tree, tree);
 796 extern tree build_stmt (enum tree_code, ...);
 797 extern tree build_case_label (tree, tree, tree);
 798 extern tree build_continue_stmt (void);
 799 extern tree build_break_stmt (void);
 800
 801 extern void c_expand_asm_operands (tree, tree, tree, tree, int, location_t);
 802
 803 /* These functions must be defined by each front-end which implements
 804    a variant of the C language.  They are used in c-common.c.  */
 805
 806 extern tree build_unary_op (enum tree_code, tree, int);
 807 extern tree build_binary_op (enum tree_code, tree, tree, int);
 808 extern int lvalue_p (tree);
 809 extern tree default_conversion (tree);
 810
 811 /* Given two integer or real types, return the type for their sum.
 812    Given two compatible ANSI C types, returns the merged type.  */
 813
 814 extern tree common_type (tree, tree);
 815
 816 extern tree decl_constant_value (tree);
 817
 818 /* Handle increment and decrement of boolean types.  */
 819 extern tree boolean_increment (enum tree_code, tree);
 820
 821 /* Hook currently used only by the C++ front end to reset internal state
 822    after entering or leaving a header file.  */
 823 extern void extract_interface_info (void);
 824
 825 extern int case_compare (splay_tree_key, splay_tree_key);
 826
 827 extern tree c_add_case_label (splay_tree, tree, tree, tree);
 828
 829 extern void c_do_switch_warnings (splay_tree, tree);
 830
 831 extern tree build_function_call (tree, tree);
 832
 833 extern tree finish_label_address_expr (tree);
 834
 835 /* Same function prototype, but the C and C++ front ends have
 836    different implementations.  Used in c-common.c.  */
 837 extern tree lookup_label (tree);
 838
 839 extern int vector_types_convertible_p (tree t1, tree t2);
 840
 841 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 842
 843 extern int c_staticp (tree);
 844
 845 extern int c_common_unsafe_for_reeval (tree);
 846
 847 extern void init_c_lex (void);
 848
 849 extern void c_cpp_builtins (cpp_reader *);
 850
 851 /* Positive if an implicit `extern "C"' scope has just been entered;
 852    negative if such a scope has just been exited.  */
 853 extern GTY(()) int pending_lang_change;
 854
 855 /* Information recorded about each file examined during compilation.  */
 856
 857 struct c_fileinfo
 858 {
 859   int time;     /* Time spent in the file.  */
 860   short interface_only;         /* Flags - used only by C++ */
 861   short interface_unknown;
 862 };
 863
 864 struct c_fileinfo *get_fileinfo (const char *);
 865 extern void dump_time_statistics (void);
 866
 867 extern bool c_dump_tree (void *, tree);
 868
 869 extern void c_warn_unused_result (tree *);
 870
 871 extern void verify_sequence_points (tree);
 872
 873 /* In c-gimplify.c  */
 874 extern void c_genericize (tree);
 875 extern int c_gimplify_expr (tree *, tree *, tree *);
 876 extern tree c_build_bind_expr (tree, tree);
 877
 878 /* In c-pch.c  */
 879 extern void pch_init (void);
 880 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 881 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 882                                const char *orig);
 883 extern void c_common_write_pch (void);
 884 extern void c_common_no_more_pch (void);
 885 extern void c_common_pch_pragma (cpp_reader *pfile);
 886
 887 extern void builtin_define_with_value (const char *, const char *, int);
 888 extern void c_stddef_cpp_builtins (void);
 889 extern void fe_file_change (const struct line_map *);
 890 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 891
 892 /* The following have been moved here from c-tree.h, since they're needed
 893    in the ObjC++ world, too.  What is more, stub-objc.c could use a few
 894    prototypes.  */
 895 extern tree lookup_interface (tree);
 896 extern tree is_class_name (tree);
 897 extern tree objc_is_object_ptr (tree);
 898 extern void objc_check_decl (tree);
 899 extern int objc_comptypes (tree, tree, int);
 900 extern tree objc_message_selector (void);
 901 extern tree lookup_objc_ivar (tree);
 902 extern void *get_current_scope (void);
 903 extern void objc_mark_locals_volatile (void *);
 904 extern void objc_clear_super_receiver (void);
 905 extern int objc_is_public (tree, tree);
 906
 907 /* In c-ppoutput.c  */
 908 extern void init_pp_output (FILE *);
 909 extern void preprocess_file (cpp_reader *);
 910 extern void pp_file_change (const struct line_map *);
 911 extern void pp_dir_change (cpp_reader *, const char *);
 912
 913 #endif /* ! GCC_C_COMMON_H */