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   /* C++0x */
  94   RID_STATIC_ASSERT,
  95
  96   /* Objective-C */
  97   RID_AT_ENCODE,   RID_AT_END,
  98   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
  99   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 100   RID_AT_PROTOCOL, RID_AT_SELECTOR,
 101   RID_AT_THROW,    RID_AT_TRY,       RID_AT_CATCH,
 102   RID_AT_FINALLY,  RID_AT_SYNCHRONIZED,
 103   RID_AT_INTERFACE,
 104   RID_AT_IMPLEMENTATION,
 105
 106   RID_MAX,
 107
 108   RID_FIRST_MODIFIER = RID_STATIC,
 109   RID_LAST_MODIFIER = RID_ONEWAY,
 110
 111   RID_FIRST_AT = RID_AT_ENCODE,
 112   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 113   RID_FIRST_PQ = RID_IN,
 114   RID_LAST_PQ = RID_ONEWAY
 115 };
 116
 117 #define OBJC_IS_AT_KEYWORD(rid) \
 118   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_AT && \
 119    (unsigned int) (rid) <= (unsigned int) RID_LAST_AT)
 120
 121 #define OBJC_IS_PQ_KEYWORD(rid) \
 122   ((unsigned int) (rid) >= (unsigned int) RID_FIRST_PQ && \
 123    (unsigned int) (rid) <= (unsigned int) RID_LAST_PQ)
 124
 125 /* The elements of `ridpointers' are identifier nodes for the reserved
 126    type names and storage classes.  It is indexed by a RID_... value.  */
 127 extern GTY ((length ("(int) RID_MAX"))) tree *ridpointers;
 128
 129 /* Standard named or nameless data types of the C compiler.  */
 130
 131 enum c_tree_index
 132 {
 133     CTI_WCHAR_TYPE,
 134     CTI_SIGNED_WCHAR_TYPE,
 135     CTI_UNSIGNED_WCHAR_TYPE,
 136     CTI_WINT_TYPE,
 137     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 138     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 139     CTI_INTMAX_TYPE,
 140     CTI_UINTMAX_TYPE,
 141     CTI_WIDEST_INT_LIT_TYPE,
 142     CTI_WIDEST_UINT_LIT_TYPE,
 143
 144     CTI_CHAR_ARRAY_TYPE,
 145     CTI_WCHAR_ARRAY_TYPE,
 146     CTI_INT_ARRAY_TYPE,
 147     CTI_STRING_TYPE,
 148     CTI_CONST_STRING_TYPE,
 149
 150     /* Type for boolean expressions (bool in C++, int in C).  */
 151     CTI_TRUTHVALUE_TYPE,
 152     CTI_TRUTHVALUE_TRUE,
 153     CTI_TRUTHVALUE_FALSE,
 154
 155     CTI_DEFAULT_FUNCTION_TYPE,
 156
 157     /* These are not types, but we have to look them up all the time.  */
 158     CTI_FUNCTION_NAME_DECL,
 159     CTI_PRETTY_FUNCTION_NAME_DECL,
 160     CTI_C99_FUNCTION_NAME_DECL,
 161     CTI_SAVED_FUNCTION_NAME_DECLS,
 162
 163     CTI_VOID_ZERO,
 164
 165     CTI_NULL,
 166
 167     CTI_MAX
 168 };
 169
 170 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 171
 172 /* Identifier part common to the C front ends.  Inherits from
 173    tree_identifier, despite appearances.  */
 174 struct c_common_identifier GTY(())
 175 {
 176   struct tree_common common;
 177   struct cpp_hashnode node;
 178 };
 179
 180 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 181 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 182 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 183 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 184 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 185 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 186 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 187 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 188 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 189 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 190
 191 #define truthvalue_type_node            c_global_trees[CTI_TRUTHVALUE_TYPE]
 192 #define truthvalue_true_node            c_global_trees[CTI_TRUTHVALUE_TRUE]
 193 #define truthvalue_false_node           c_global_trees[CTI_TRUTHVALUE_FALSE]
 194
 195 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 196 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 197 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 198 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 199 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 200
 201 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 202
 203 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 204 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 205 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 206 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 207
 208 /* A node for `((void) 0)'.  */
 209 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 210
 211 /* The node for C++ `__null'.  */
 212 #define null_node                       c_global_trees[CTI_NULL]
 213
 214 extern GTY(()) tree c_global_trees[CTI_MAX];
 215
 216 /* In a RECORD_TYPE, a sorted array of the fields of the type, not a
 217    tree for size reasons.  */
 218 struct sorted_fields_type GTY(())
 219 {
 220   int len;
 221   tree GTY((length ("%h.len"))) elts[1];
 222 };
 223
 224 /* Mark which labels are explicitly declared.
 225    These may be shadowed, and may be referenced from nested functions.  */
 226 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 227
 228 typedef enum c_language_kind
 229 {
 230   clk_c         = 0,            /* C90, C94 or C99 */
 231   clk_objc      = 1,            /* clk_c with ObjC features.  */
 232   clk_cxx       = 2,            /* ANSI/ISO C++ */
 233   clk_objcxx    = 3             /* clk_cxx with ObjC features.  */
 234 }
 235 c_language_kind;
 236
 237 /* To test for a specific language use c_language, defined by each
 238    front end.  For "ObjC features" or "not C++" use the macros.  */
 239 extern c_language_kind c_language;
 240
 241 #define c_dialect_cxx()         (c_language & clk_cxx)
 242 #define c_dialect_objc()        (c_language & clk_objc)
 243
 244 /* Information about a statement tree.  */
 245
 246 struct stmt_tree_s GTY(()) {
 247   /* The current statement list being collected.  */
 248   tree x_cur_stmt_list;
 249
 250   /* In C++, Nonzero if we should treat statements as full
 251      expressions.  In particular, this variable is no-zero if at the
 252      end of a statement we should destroy any temporaries created
 253      during that statement.  Similarly, if, at the end of a block, we
 254      should destroy any local variables in this block.  Normally, this
 255      variable is nonzero, since those are the normal semantics of
 256      C++.
 257
 258      However, in order to represent aggregate initialization code as
 259      tree structure, we use statement-expressions.  The statements
 260      within the statement expression should not result in cleanups
 261      being run until the entire enclosing statement is complete.
 262
 263      This flag has no effect in C.  */
 264   int stmts_are_full_exprs_p;
 265 };
 266
 267 typedef struct stmt_tree_s *stmt_tree;
 268
 269 /* Global state pertinent to the current function.  Some C dialects
 270    extend this structure with additional fields.  */
 271
 272 struct c_language_function GTY(()) {
 273   /* While we are parsing the function, this contains information
 274      about the statement-tree that we are building.  */
 275   struct stmt_tree_s x_stmt_tree;
 276 };
 277
 278 /* When building a statement-tree, this is the current statement list
 279    being collected.  It's TREE_CHAIN is a back-pointer to the previous
 280    statement list.  */
 281
 282 #define cur_stmt_list (current_stmt_tree ()->x_cur_stmt_list)
 283
 284 /* Language-specific hooks.  */
 285
 286 /* Callback that determines if it's ok for a function to have no
 287    noreturn attribute.  */
 288 extern int (*lang_missing_noreturn_ok_p) (tree);
 289
 290 /* If non-NULL, this function is called after a precompile header file
 291    is loaded.  */
 292 extern void (*lang_post_pch_load) (void);
 293
 294 extern void push_file_scope (void);
 295 extern void pop_file_scope (void);
 296 extern stmt_tree current_stmt_tree (void);
 297 extern tree push_stmt_list (void);
 298 extern tree pop_stmt_list (tree);
 299 extern tree add_stmt (tree);
 300 extern void push_cleanup (tree, tree, bool);
 301 extern tree pushdecl_top_level (tree);
 302 extern tree pushdecl (tree);
 303 extern tree build_modify_expr (tree, enum tree_code, tree);
 304 extern tree build_indirect_ref (tree, const char *);
 305
 306 extern int c_expand_decl (tree);
 307
 308 extern int field_decl_cmp (const void *, const void *);
 309 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 310                                   void *);
 311 extern bool has_c_linkage (tree decl);
 312 \f
 313 /* Switches common to the C front ends.  */
 314
 315 /* Nonzero if prepreprocessing only.  */
 316
 317 extern int flag_preprocess_only;
 318
 319 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 320    calls will be used in ObjC; passing nil receivers to such calls
 321    will most likely result in crashes.  */
 322 extern int flag_nil_receivers;
 323
 324 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 325    @try, etc.) in source code.  */
 326 extern int flag_objc_exceptions;
 327
 328 /* Nonzero means that we generate NeXT setjmp based exceptions.  */
 329 extern int flag_objc_sjlj_exceptions;
 330
 331 /* Nonzero means that code generation will be altered to support
 332    "zero-link" execution.  This currently affects ObjC only, but may
 333    affect other languages in the future.  */
 334 extern int flag_zero_link;
 335
 336 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 337    unit.  It will inform the ObjC runtime that class definition(s) herein
 338    contained are to replace one(s) previously loaded.  */
 339 extern int flag_replace_objc_classes;
 340
 341 /* Nonzero means don't output line number information.  */
 342
 343 extern char flag_no_line_commands;
 344
 345 /* Nonzero causes -E output not to be done, but directives such as
 346    #define that have side effects are still obeyed.  */
 347
 348 extern char flag_no_output;
 349
 350 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 351    'N' of the command line switch.  */
 352
 353 extern char flag_dump_macros;
 354
 355 /* Nonzero means pass #include lines through to the output.  */
 356
 357 extern char flag_dump_includes;
 358
 359 /* Nonzero means process PCH files while preprocessing.  */
 360
 361 extern bool flag_pch_preprocess;
 362
 363 /* The file name to which we should write a precompiled header, or
 364    NULL if no header will be written in this compile.  */
 365
 366 extern const char *pch_file;
 367
 368 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 369    user's namespace.  */
 370
 371 extern int flag_iso;
 372
 373 /* Nonzero if -undef was given.  It suppresses target built-in macros
 374    and assertions.  */
 375
 376 extern int flag_undef;
 377
 378 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 379
 380 extern int flag_no_builtin;
 381
 382 /* Nonzero means don't recognize the non-ANSI builtin functions.
 383    -ansi sets this.  */
 384
 385 extern int flag_no_nonansi_builtin;
 386
 387 /* Nonzero means give `double' the same size as `float'.  */
 388
 389 extern int flag_short_double;
 390
 391 /* Nonzero means give `wchar_t' the same size as `short'.  */
 392
 393 extern int flag_short_wchar;
 394
 395 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 396 extern int flag_ms_extensions;
 397
 398 /* Nonzero means don't recognize the keyword `asm'.  */
 399
 400 extern int flag_no_asm;
 401
 402 /* Nonzero means give string constants the type `const char *', as mandated
 403    by the standard.  */
 404
 405 extern int flag_const_strings;
 406
 407 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 408
 409 extern int flag_signed_bitfields;
 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 /* Tells the compiler that this is a special run.  Do not perform any
 455    compiling, instead we are to test some platform dependent features
 456    and output a C header file with appropriate definitions.  */
 457
 458 extern int print_struct_values;
 459
 460 /* ???.  Undocumented.  */
 461
 462 extern const char *constant_string_class_name;
 463
 464
 465 /* C++ language option variables.  */
 466
 467
 468 /* Nonzero means don't recognize any extension keywords.  */
 469
 470 extern int flag_no_gnu_keywords;
 471
 472 /* Nonzero means do emit exported implementations of functions even if
 473    they can be inlined.  */
 474
 475 extern int flag_implement_inlines;
 476
 477 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 478
 479 extern int flag_implicit_templates;
 480
 481 /* Nonzero means that implicit instantiations of inline templates will be
 482    emitted if needed, even if instantiations of non-inline templates
 483    aren't.  */
 484
 485 extern int flag_implicit_inline_templates;
 486
 487 /* Nonzero means generate separate instantiation control files and
 488    juggle them at link time.  */
 489
 490 extern int flag_use_repository;
 491
 492 /* Nonzero if we want to issue diagnostics that the standard says are not
 493    required.  */
 494
 495 extern int flag_optional_diags;
 496
 497 /* Nonzero means we should attempt to elide constructors when possible.  */
 498
 499 extern int flag_elide_constructors;
 500
 501 /* Nonzero means that member functions defined in class scope are
 502    inline by default.  */
 503
 504 extern int flag_default_inline;
 505
 506 /* Controls whether compiler generates 'type descriptor' that give
 507    run-time type information.  */
 508
 509 extern int flag_rtti;
 510
 511 /* Nonzero if we want to conserve space in the .o files.  We do this
 512    by putting uninitialized data and runtime initialized data into
 513    .common instead of .data at the expense of not flagging multiple
 514    definitions.  */
 515
 516 extern int flag_conserve_space;
 517
 518 /* Nonzero if we want to obey access control semantics.  */
 519
 520 extern int flag_access_control;
 521
 522 /* Nonzero if we want to check the return value of new and avoid calling
 523    constructors if it is a null pointer.  */
 524
 525 extern int flag_check_new;
 526
 527 /* Nonzero if we want to allow the use of experimental features that
 528    are likely to become part of C++0x. */
 529
 530 extern int flag_cpp0x;
 531
 532 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 533    initialization variables.
 534    0: Old rules, set by -fno-for-scope.
 535    2: New ISO rules, set by -ffor-scope.
 536    1: Try to implement new ISO rules, but with backup compatibility
 537    (and warnings).  This is the default, for now.  */
 538
 539 extern int flag_new_for_scope;
 540
 541 /* Nonzero if we want to emit defined symbols with common-like linkage as
 542    weak symbols where possible, in order to conform to C++ semantics.
 543    Otherwise, emit them as local symbols.  */
 544
 545 extern int flag_weak;
 546
 547 /* 0 means we want the preprocessor to not emit line directives for
 548    the current working directory.  1 means we want it to do it.  -1
 549    means we should decide depending on whether debugging information
 550    is being emitted or not.  */
 551
 552 extern int flag_working_directory;
 553
 554 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 555    destructors for local statics and global objects.  */
 556
 557 extern int flag_use_cxa_atexit;
 558
 559 /* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
 560    logic.  */
 561
 562 extern int flag_use_cxa_get_exception_ptr;
 563
 564 /* Nonzero means make the default pedwarns warnings instead of errors.
 565    The value of this flag is ignored if -pedantic is specified.  */
 566
 567 extern int flag_permissive;
 568
 569 /* Nonzero means to implement standard semantics for exception
 570    specifications, calling unexpected if an exception is thrown that
 571    doesn't match the specification.  Zero means to treat them as
 572    assertions and optimize accordingly, but not check them.  */
 573
 574 extern int flag_enforce_eh_specs;
 575
 576 /* Nonzero (the default) means to generate thread-safe code for
 577    initializing local statics.  */
 578
 579 extern int flag_threadsafe_statics;
 580
 581 /* Nonzero means warn about implicit declarations.  */
 582
 583 extern int warn_implicit;
 584
 585 /* Warn about using __null (as NULL in C++) as sentinel.  For code compiled
 586    with GCC this doesn't matter as __null is guaranteed to have the right
 587    size.  */
 588
 589 extern int warn_strict_null_sentinel;
 590
 591 /* Maximum template instantiation depth.  This limit is rather
 592    arbitrary, but it exists to limit the time it takes to notice
 593    infinite template instantiations.  */
 594
 595 extern int max_tinst_depth;
 596
 597 /* Nonzero means the expression being parsed will never be evaluated.
 598    This is a count, since unevaluated expressions can nest.  */
 599
 600 extern int skip_evaluation;
 601
 602 /* C types are partitioned into three subsets: object, function, and
 603    incomplete types.  */
 604 #define C_TYPE_OBJECT_P(type) \
 605   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 606
 607 #define C_TYPE_INCOMPLETE_P(type) \
 608   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 609
 610 #define C_TYPE_FUNCTION_P(type) \
 611   (TREE_CODE (type) == FUNCTION_TYPE)
 612
 613 /* For convenience we define a single macro to identify the class of
 614    object or incomplete types.  */
 615 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 616   (!C_TYPE_FUNCTION_P (type))
 617
 618 /* Attribute table common to the C front ends.  */
 619 extern const struct attribute_spec c_common_attribute_table[];
 620 extern const struct attribute_spec c_common_format_attribute_table[];
 621
 622 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 623    ID is the identifier to use, NAME is the string.
 624    TYPE_DEP indicates whether it depends on type of the function or not
 625    (i.e. __PRETTY_FUNCTION__).  */
 626
 627 extern tree (*make_fname_decl) (tree, int);
 628
 629 extern tree identifier_global_value (tree);
 630 extern void record_builtin_type (enum rid, const char *, tree);
 631 extern tree build_void_list_node (void);
 632 extern void start_fname_decls (void);
 633 extern void finish_fname_decls (void);
 634 extern const char *fname_as_string (int);
 635 extern tree fname_decl (unsigned, tree);
 636
 637 extern void check_function_arguments (tree, tree, tree);
 638 extern void check_function_arguments_recurse (void (*)
 639                                               (void *, tree,
 640                                                unsigned HOST_WIDE_INT),
 641                                               void *, tree,
 642                                               unsigned HOST_WIDE_INT);
 643 extern void check_function_format (tree, tree);
 644 extern void set_Wformat (int);
 645 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 646 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 647 extern int c_common_handle_option (size_t code, const char *arg, int value);
 648 extern bool c_common_missing_argument (const char *opt, size_t code);
 649 extern tree c_common_type_for_mode (enum machine_mode, int);
 650 extern tree c_common_type_for_size (unsigned int, int);
 651 extern tree c_common_unsigned_type (tree);
 652 extern tree c_common_signed_type (tree);
 653 extern tree c_common_signed_or_unsigned_type (int, tree);
 654 extern tree c_build_bitfield_integer_type (unsigned HOST_WIDE_INT, int);
 655 extern tree c_common_truthvalue_conversion (tree);
 656 extern void c_apply_type_quals_to_decl (int, tree);
 657 extern tree c_sizeof_or_alignof_type (tree, bool, int);
 658 extern tree c_alignof_expr (tree);
 659 /* Print an error message for invalid operands to arith operation CODE.
 660    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 661 extern void binary_op_error (enum tree_code);
 662 extern tree fix_string_type (tree);
 663 struct varray_head_tag;
 664 extern void constant_expression_warning (tree);
 665 extern void strict_aliasing_warning (tree, tree, tree);
 666 extern void empty_body_warning (tree, tree);
 667 extern tree convert_and_check (tree, tree);
 668 extern void overflow_warning (tree);
 669 extern void check_main_parameter_types (tree decl);
 670 extern bool c_determine_visibility (tree);
 671 extern bool same_scalar_type_ignoring_signedness (tree, tree);
 672
 673 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, true, 1)
 674 #define c_alignof(T) c_sizeof_or_alignof_type (T, false, 1)
 675
 676 /* Subroutine of build_binary_op, used for comparison operations.
 677    See if the operands have both been converted from subword integer types
 678    and, if so, perhaps change them both back to their original type.  */
 679 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 680
 681 extern tree pointer_int_sum (enum tree_code, tree, tree);
 682 extern unsigned int min_precision (tree, int);
 683
 684 /* Add qualifiers to a type, in the fashion for C.  */
 685 extern tree c_build_qualified_type (tree, int);
 686
 687 /* Build tree nodes and builtin functions common to both C and C++ language
 688    frontends.  */
 689 extern void c_common_nodes_and_builtins (void);
 690
 691 extern void set_builtin_user_assembler_name (tree decl, const char *asmspec);
 692
 693 extern void disable_builtin_function (const char *);
 694
 695 extern void set_compound_literal_name (tree decl);
 696
 697 extern tree build_va_arg (tree, tree);
 698
 699 extern unsigned int c_common_init_options (unsigned int, const char **);
 700 extern bool c_common_post_options (const char **);
 701 extern bool c_common_init (void);
 702 extern void c_common_finish (void);
 703 extern void c_common_parse_file (int);
 704 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 705 extern void c_register_builtin_type (tree, const char*);
 706 extern bool c_promoting_integer_type_p (tree);
 707 extern int self_promoting_args_p (tree);
 708 extern tree strip_array_types (tree);
 709 extern tree strip_pointer_operator (tree);
 710 extern HOST_WIDE_INT c_common_to_target_charset (HOST_WIDE_INT);
 711
 712 /* This is the basic parsing function.  */
 713 extern void c_parse_file (void);
 714 /* This is misnamed, it actually performs end-of-compilation processing.  */
 715 extern void finish_file (void);
 716
 717
 718 /* These macros provide convenient access to the various _STMT nodes.  */
 719
 720 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 721    if a statement expression.  */
 722 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 723   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 724
 725 /* Nonzero if a label has been added to the statement list.  */
 726 #define STATEMENT_LIST_HAS_LABEL(NODE) \
 727   TREE_LANG_FLAG_3 (STATEMENT_LIST_CHECK (NODE))
 728
 729 /* COMPOUND_LITERAL_EXPR accessors.  */
 730 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 731   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 732 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 733   DECL_EXPR_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 734
 735 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 736
 737 enum c_tree_code {
 738   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 739 #include "c-common.def"
 740   LAST_C_TREE_CODE
 741 };
 742
 743 #undef DEFTREECODE
 744
 745 extern int anon_aggr_type_p (tree);
 746
 747 /* For a VAR_DECL that is an anonymous union, these are the various
 748    sub-variables that make up the anonymous union.  */
 749 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 750
 751 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 752 #define DECL_C_BIT_FIELD(NODE) \
 753   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 754 #define SET_DECL_C_BIT_FIELD(NODE) \
 755   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 756 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 757   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 758
 759 extern void emit_local_var (tree);
 760 extern tree do_case (tree, tree);
 761 extern tree build_stmt (enum tree_code, ...);
 762 extern tree build_case_label (tree, tree, tree);
 763
 764 /* These functions must be defined by each front-end which implements
 765    a variant of the C language.  They are used in c-common.c.  */
 766
 767 extern tree build_unary_op (enum tree_code, tree, int);
 768 extern tree build_binary_op (enum tree_code, tree, tree, int);
 769 extern tree perform_integral_promotions (tree);
 770
 771 /* These functions must be defined by each front-end which implements
 772    a variant of the C language.  They are used by port files.  */
 773
 774 extern tree default_conversion (tree);
 775
 776 /* Given two integer or real types, return the type for their sum.
 777    Given two compatible ANSI C types, returns the merged type.  */
 778
 779 extern tree common_type (tree, tree);
 780
 781 extern tree decl_constant_value (tree);
 782
 783 /* Handle increment and decrement of boolean types.  */
 784 extern tree boolean_increment (enum tree_code, tree);
 785
 786 extern int case_compare (splay_tree_key, splay_tree_key);
 787
 788 extern tree c_add_case_label (splay_tree, tree, tree, tree, tree);
 789
 790 extern void c_do_switch_warnings (splay_tree, location_t, tree, tree);
 791
 792 extern tree build_function_call (tree, tree);
 793
 794 extern tree resolve_overloaded_builtin (tree, tree);
 795
 796 extern tree finish_label_address_expr (tree);
 797
 798 /* Same function prototype, but the C and C++ front ends have
 799    different implementations.  Used in c-common.c.  */
 800 extern tree lookup_label (tree);
 801 extern tree lookup_name (tree);
 802
 803 extern int vector_types_convertible_p (tree t1, tree t2);
 804
 805 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
 806
 807 extern tree c_staticp (tree);
 808
 809 extern void init_c_lex (void);
 810
 811 extern void c_cpp_builtins (cpp_reader *);
 812
 813 /* Positive if an implicit `extern "C"' scope has just been entered;
 814    negative if such a scope has just been exited.  */
 815 extern GTY(()) int pending_lang_change;
 816
 817 /* Information recorded about each file examined during compilation.  */
 818
 819 struct c_fileinfo
 820 {
 821   int time;     /* Time spent in the file.  */
 822
 823   /* Flags used only by C++.
 824      INTERFACE_ONLY nonzero means that we are in an "interface" section
 825      of the compiler.  INTERFACE_UNKNOWN nonzero means we cannot trust
 826      the value of INTERFACE_ONLY.  If INTERFACE_UNKNOWN is zero and
 827      INTERFACE_ONLY is zero, it means that we are responsible for
 828      exporting definitions that others might need.  */
 829   short interface_only;
 830   short interface_unknown;
 831 };
 832
 833 struct c_fileinfo *get_fileinfo (const char *);
 834 extern void dump_time_statistics (void);
 835
 836 extern bool c_dump_tree (void *, tree);
 837
 838 extern void c_warn_unused_result (tree *);
 839
 840 extern void verify_sequence_points (tree);
 841
 842 extern tree fold_offsetof (tree, tree);
 843
 844 /* Places where an lvalue, or modifiable lvalue, may be required.
 845    Used to select diagnostic messages in lvalue_error and
 846    readonly_error.  */
 847 enum lvalue_use {
 848   lv_assign,
 849   lv_increment,
 850   lv_decrement,
 851   lv_addressof,
 852   lv_asm
 853 };
 854
 855 extern void lvalue_error (enum lvalue_use);
 856
 857 extern int complete_array_type (tree *, tree, bool);
 858
 859 extern tree builtin_type_for_size (int, bool);
 860
 861 extern void warn_array_subscript_with_type_char (tree);
 862 extern void warn_about_parentheses (enum tree_code, enum tree_code,
 863                                     enum tree_code);
 864
 865
 866 /* In c-gimplify.c  */
 867 extern void c_genericize (tree);
 868 extern int c_gimplify_expr (tree *, tree *, tree *);
 869 extern tree c_build_bind_expr (tree, tree);
 870
 871 /* In c-pch.c  */
 872 extern void pch_init (void);
 873 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
 874 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
 875                                const char *orig);
 876 extern void c_common_write_pch (void);
 877 extern void c_common_no_more_pch (void);
 878 extern void c_common_pch_pragma (cpp_reader *pfile, const char *);
 879 extern void c_common_print_pch_checksum (FILE *f);
 880
 881 /* In *-checksum.c */
 882 extern const unsigned char executable_checksum[16];
 883
 884 extern void builtin_define_with_value (const char *, const char *, int);
 885 extern void c_stddef_cpp_builtins (void);
 886 extern void fe_file_change (const struct line_map *);
 887 extern void c_parse_error (const char *, enum cpp_ttype, tree);
 888
 889 /* Objective-C / Objective-C++ entry points.  */
 890
 891 /* The following ObjC/ObjC++ functions are called by the C and/or C++
 892    front-ends; they all must have corresponding stubs in stub-objc.c.  */
 893 extern tree objc_is_class_name (tree);
 894 extern tree objc_is_object_ptr (tree);
 895 extern void objc_check_decl (tree);
 896 extern int objc_is_reserved_word (tree);
 897 extern bool objc_compare_types (tree, tree, int, tree);
 898 extern void objc_volatilize_decl (tree);
 899 extern bool objc_type_quals_match (tree, tree);
 900 extern tree objc_rewrite_function_call (tree, tree);
 901 extern tree objc_message_selector (void);
 902 extern tree objc_lookup_ivar (tree, tree);
 903 extern void objc_clear_super_receiver (void);
 904 extern int objc_is_public (tree, tree);
 905 extern tree objc_is_id (tree);
 906 extern void objc_declare_alias (tree, tree);
 907 extern void objc_declare_class (tree);
 908 extern void objc_declare_protocols (tree);
 909 extern tree objc_build_message_expr (tree);
 910 extern tree objc_finish_message_expr (tree, tree, tree);
 911 extern tree objc_build_selector_expr (tree);
 912 extern tree objc_build_protocol_expr (tree);
 913 extern tree objc_build_encode_expr (tree);
 914 extern tree objc_build_string_object (tree);
 915 extern tree objc_get_protocol_qualified_type (tree, tree);
 916 extern tree objc_get_class_reference (tree);
 917 extern tree objc_get_class_ivars (tree);
 918 extern void objc_start_class_interface (tree, tree, tree);
 919 extern void objc_start_category_interface (tree, tree, tree);
 920 extern void objc_start_protocol (tree, tree);
 921 extern void objc_continue_interface (void);
 922 extern void objc_finish_interface (void);
 923 extern void objc_start_class_implementation (tree, tree);
 924 extern void objc_start_category_implementation (tree, tree);
 925 extern void objc_continue_implementation (void);
 926 extern void objc_finish_implementation (void);
 927 extern void objc_set_visibility (int);
 928 extern void objc_set_method_type (enum tree_code);
 929 extern tree objc_build_method_signature (tree, tree, tree, bool);
 930 extern void objc_add_method_declaration (tree);
 931 extern void objc_start_method_definition (tree);
 932 extern void objc_finish_method_definition (tree);
 933 extern void objc_add_instance_variable (tree);
 934 extern tree objc_build_keyword_decl (tree, tree, tree);
 935 extern tree objc_build_throw_stmt (tree);
 936 extern void objc_begin_try_stmt (location_t, tree);
 937 extern tree objc_finish_try_stmt (void);
 938 extern void objc_begin_catch_clause (tree);
 939 extern void objc_finish_catch_clause (void);
 940 extern void objc_build_finally_clause (location_t, tree);
 941 extern tree objc_build_synchronized (location_t, tree, tree);
 942 extern int objc_static_init_needed_p (void);
 943 extern tree objc_generate_static_init_call (tree);
 944 extern tree objc_generate_write_barrier (tree, enum tree_code, tree);
 945
 946 /* The following are provided by the C and C++ front-ends, and called by
 947    ObjC/ObjC++.  */
 948 extern void *objc_get_current_scope (void);
 949 extern void objc_mark_locals_volatile (void *);
 950
 951 /* In c-ppoutput.c  */
 952 extern void init_pp_output (FILE *);
 953 extern void preprocess_file (cpp_reader *);
 954 extern void pp_file_change (const struct line_map *);
 955 extern void pp_dir_change (cpp_reader *, const char *);
 956 extern bool check_missing_format_attribute (tree, tree);
 957
 958 /* In c-omp.c  */
 959 extern tree c_finish_omp_master (tree);
 960 extern tree c_finish_omp_critical (tree, tree);
 961 extern tree c_finish_omp_ordered (tree);
 962 extern void c_finish_omp_barrier (void);
 963 extern tree c_finish_omp_atomic (enum tree_code, tree, tree);
 964 extern void c_finish_omp_flush (void);
 965 extern tree c_finish_omp_for (location_t, tree, tree, tree, tree, tree, tree);
 966 extern void c_split_parallel_clauses (tree, tree *, tree *);
 967 extern enum omp_clause_default_kind c_omp_predetermined_sharing (tree);
 968
 969 /* Not in c-omp.c; provided by the front end.  */
 970 extern bool c_omp_sharing_predetermined (tree);
 971 extern tree c_omp_remap_decl (tree, bool);
 972
 973 /* In order for the format checking to accept the C frontend
 974    diagnostic framework extensions, you must include this file before
 975    toplev.h, not after.  The C front end formats are a subset of those
 976    for C++, so they are the appropriate set to use in common code;
 977    cp-tree.h overrides this for C++.  */
 978 #ifndef GCC_DIAG_STYLE
 979 #define GCC_DIAG_STYLE __gcc_cdiag__
 980 #endif
 981
 982 #endif /* ! GCC_C_COMMON_H */