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 int (*lang_gimplify_stmt) (tree *);
 284 extern void (*lang_expand_function_end) (void);
 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 extern void push_file_scope (void);
 291 extern void pop_file_scope (void);
 292 extern int yyparse (void);
 293 extern stmt_tree current_stmt_tree (void);
 294 extern tree push_stmt_list (void);
 295 extern tree re_push_stmt_list (tree);
 296 extern tree pop_stmt_list (tree);
 297 extern tree add_stmt (tree);
 298 extern void add_decl_stmt (tree);
 299 extern void push_cleanup (tree, tree, bool);
 300
 301 extern tree walk_stmt_tree (tree *, walk_tree_fn, void *);
 302 extern void prep_stmt (tree);
 303 extern int c_expand_decl (tree);
 304
 305 extern int field_decl_cmp (const void *, const void *);
 306 extern void resort_sorted_fields (void *, void *, gt_pointer_operator,
 307                                   void *);
 308 \f
 309 /* Switches common to the C front ends.  */
 310
 311 /* Nonzero if prepreprocessing only.  */
 312
 313 extern int flag_preprocess_only;
 314
 315 /* Zero means that faster, ...NonNil variants of objc_msgSend...
 316    calls will be used in ObjC; passing nil receivers to such calls
 317    will most likely result in crashes.  */
 318 extern int flag_nil_receivers;
 319
 320 /* Nonzero means that we will allow new ObjC exception syntax (@throw,
 321    @try, etc.) in source code.  */
 322 extern int flag_objc_exceptions;
 323
 324 /* Nonzero means that code generation will be altered to support
 325    "zero-link" execution.  This currently affects ObjC only, but may
 326    affect other languages in the future.  */
 327 extern int flag_zero_link;
 328
 329 /* Nonzero means emit an '__OBJC, __image_info' for the current translation
 330    unit.  It will inform the ObjC runtime that class definition(s) herein
 331    contained are to replace one(s) previously loaded.  */
 332 extern int flag_replace_objc_classes;
 333
 334 /* Nonzero means don't output line number information.  */
 335
 336 extern char flag_no_line_commands;
 337
 338 /* Nonzero causes -E output not to be done, but directives such as
 339    #define that have side effects are still obeyed.  */
 340
 341 extern char flag_no_output;
 342
 343 /* Nonzero means dump macros in some fashion; contains the 'D', 'M' or
 344    'N' of the command line switch.  */
 345
 346 extern char flag_dump_macros;
 347
 348 /* Nonzero means pass #include lines through to the output.  */
 349
 350 extern char flag_dump_includes;
 351
 352 /* The file name to which we should write a precompiled header, or
 353    NULL if no header will be written in this compile.  */
 354
 355 extern const char *pch_file;
 356
 357 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 358    user's namespace.  */
 359
 360 extern int flag_iso;
 361
 362 /* Nonzero if -undef was given.  It suppresses target built-in macros
 363    and assertions.  */
 364
 365 extern int flag_undef;
 366
 367 /* Nonzero means don't recognize the non-ANSI builtin functions.  */
 368
 369 extern int flag_no_builtin;
 370
 371 /* Nonzero means don't recognize the non-ANSI builtin functions.
 372    -ansi sets this.  */
 373
 374 extern int flag_no_nonansi_builtin;
 375
 376 /* Nonzero means give `double' the same size as `float'.  */
 377
 378 extern int flag_short_double;
 379
 380 /* Nonzero means give `wchar_t' the same size as `short'.  */
 381
 382 extern int flag_short_wchar;
 383
 384 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 385 extern int flag_ms_extensions;
 386
 387 /* Nonzero means don't recognize the keyword `asm'.  */
 388
 389 extern int flag_no_asm;
 390
 391 /* Nonzero means give string constants the type `const char *', as mandated
 392    by the standard.  */
 393
 394 extern int flag_const_strings;
 395
 396 /* Nonzero means to treat bitfields as signed unless they say `unsigned'.  */
 397
 398 extern int flag_signed_bitfields;
 399 extern int explicit_flag_signed_bitfields;
 400
 401 /* Nonzero means warn about pointer casts that can drop a type qualifier
 402    from the pointer target type.  */
 403
 404 extern int warn_cast_qual;
 405
 406 /* Warn about functions which might be candidates for format attributes.  */
 407
 408 extern int warn_missing_format_attribute;
 409
 410 /* Nonzero means warn about sizeof(function) or addition/subtraction
 411    of function pointers.  */
 412
 413 extern int warn_pointer_arith;
 414
 415 /* Nonzero means warn for any global function def
 416    without separate previous prototype decl.  */
 417
 418 extern int warn_missing_prototypes;
 419
 420 /* Warn if adding () is suggested.  */
 421
 422 extern int warn_parentheses;
 423
 424 /* Warn if initializer is not completely bracketed.  */
 425
 426 extern int warn_missing_braces;
 427
 428 /* Warn about comparison of signed and unsigned values.
 429    If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified.  */
 430
 431 extern int warn_sign_compare;
 432
 433 /* Nonzero means warn about usage of long long when `-pedantic'.  */
 434
 435 extern int warn_long_long;
 436
 437 /* Nonzero means warn about deprecated conversion from string constant to
 438    `char *'.  */
 439
 440 extern int warn_write_strings;
 441
 442 /* Nonzero means warn about multiple (redundant) decls for the same single
 443    variable or function.  */
 444
 445 extern int warn_redundant_decls;
 446
 447 /* Warn about testing equality of floating point numbers.  */
 448
 449 extern int warn_float_equal;
 450
 451 /* Warn about a subscript that has type char.  */
 452
 453 extern int warn_char_subscripts;
 454
 455 /* Warn if a type conversion is done that might have confusing results.  */
 456
 457 extern int warn_conversion;
 458
 459 /* Warn about #pragma directives that are not recognized.  */
 460
 461 extern int warn_unknown_pragmas; /* Tri state variable.  */
 462
 463 /* Warn about format/argument anomalies in calls to formatted I/O functions
 464    (*printf, *scanf, strftime, strfmon, etc.).  */
 465
 466 extern int warn_format;
 467
 468 /* Warn about Y2K problems with strftime formats.  */
 469
 470 extern int warn_format_y2k;
 471
 472 /* Warn about excess arguments to formats.  */
 473
 474 extern int warn_format_extra_args;
 475
 476 /* Warn about zero-length formats.  */
 477
 478 extern int warn_format_zero_length;
 479
 480 /* Warn about non-literal format arguments.  */
 481
 482 extern int warn_format_nonliteral;
 483
 484 /* Warn about possible security problems with calls to format functions.  */
 485
 486 extern int warn_format_security;
 487
 488
 489 /* C/ObjC language option variables.  */
 490
 491
 492 /* Nonzero means message about use of implicit function declarations;
 493  1 means warning; 2 means error.  */
 494
 495 extern int mesg_implicit_function_declaration;
 496
 497 /* Nonzero means allow type mismatches in conditional expressions;
 498    just make their values `void'.  */
 499
 500 extern int flag_cond_mismatch;
 501
 502 /* Nonzero means enable C89 Amendment 1 features.  */
 503
 504 extern int flag_isoc94;
 505
 506 /* Nonzero means use the ISO C99 dialect of C.  */
 507
 508 extern int flag_isoc99;
 509
 510 /* Nonzero means that we have builtin functions, and main is an int.  */
 511
 512 extern int flag_hosted;
 513
 514 /* Nonzero means warn when casting a function call to a type that does
 515    not match the return type (e.g. (float)sqrt() or (anything*)malloc()
 516    when there is no previous declaration of sqrt or malloc.  */
 517
 518 extern int warn_bad_function_cast;
 519
 520 /* Warn about traditional constructs whose meanings changed in ANSI C.  */
 521
 522 extern int warn_traditional;
 523
 524 /* Nonzero means warn for a declaration found after a statement.  */
 525
 526 extern int warn_declaration_after_statement;
 527
 528 /* Nonzero means warn for non-prototype function decls
 529    or non-prototyped defs without previous prototype.  */
 530
 531 extern int warn_strict_prototypes;
 532
 533 /* Nonzero means warn for any global function def
 534    without separate previous decl.  */
 535
 536 extern int warn_missing_declarations;
 537
 538 /* Nonzero means warn about extern declarations of objects not at
 539    file-scope level and about *all* declarations of functions (whether
 540    extern or static) not at file-scope level.  Note that we exclude
 541    implicit function declarations.  To get warnings about those, use
 542    -Wimplicit.  */
 543
 544 extern int warn_nested_externs;
 545
 546 /* Warn if main is suspicious.  */
 547
 548 extern int warn_main;
 549
 550 /* Nonzero means warn about possible violations of sequence point rules.  */
 551
 552 extern int warn_sequence_point;
 553
 554 /* Nonzero means warn about uninitialized variable when it is initialized with itself.
 555    For example: int i = i;, GCC will not warn about this when warn_init_self is nonzero.  */
 556
 557 extern int warn_init_self;
 558
 559
 560 /* Nonzero means to warn about compile-time division by zero.  */
 561 extern int warn_div_by_zero;
 562
 563 /* Nonzero means warn about use of implicit int.  */
 564
 565 extern int warn_implicit_int;
 566
 567 /* Warn about NULL being passed to argument slots marked as requiring
 568    non-NULL.  */
 569
 570 extern int warn_nonnull;
 571
 572 /* Warn about old-style parameter declaration.  */
 573
 574 extern int warn_old_style_definition;
 575
 576
 577 /* ObjC language option variables.  */
 578
 579
 580 /* Open and close the file for outputting class declarations, if
 581    requested (ObjC).  */
 582
 583 extern int flag_gen_declaration;
 584
 585 /* Generate code for GNU or NeXT runtime environment.  */
 586
 587 extern int flag_next_runtime;
 588
 589 /* Tells the compiler that this is a special run.  Do not perform any
 590    compiling, instead we are to test some platform dependent features
 591    and output a C header file with appropriate definitions.  */
 592
 593 extern int print_struct_values;
 594
 595 /* ???.  Undocumented.  */
 596
 597 extern const char *constant_string_class_name;
 598
 599 /* Warn if multiple methods are seen for the same selector, but with
 600    different argument types.  Performs the check on the whole selector
 601    table at the end of compilation.  */
 602
 603 extern int warn_selector;
 604
 605 /* Warn if a @selector() is found, and no method with that selector
 606    has been previously declared.  The check is done on each
 607    @selector() as soon as it is found - so it warns about forward
 608    declarations.  */
 609
 610 extern int warn_undeclared_selector;
 611
 612 /* Warn if methods required by a protocol are not implemented in the
 613    class adopting it.  When turned off, methods inherited to that
 614    class are also considered implemented.  */
 615
 616 extern int warn_protocol;
 617
 618
 619 /* C++ language option variables.  */
 620
 621
 622 /* Nonzero means don't recognize any extension keywords.  */
 623
 624 extern int flag_no_gnu_keywords;
 625
 626 /* Nonzero means do emit exported implementations of functions even if
 627    they can be inlined.  */
 628
 629 extern int flag_implement_inlines;
 630
 631 /* Nonzero means that implicit instantiations will be emitted if needed.  */
 632
 633 extern int flag_implicit_templates;
 634
 635 /* Nonzero means that implicit instantiations of inline templates will be
 636    emitted if needed, even if instantiations of non-inline templates
 637    aren't.  */
 638
 639 extern int flag_implicit_inline_templates;
 640
 641 /* Nonzero means generate separate instantiation control files and
 642    juggle them at link time.  */
 643
 644 extern int flag_use_repository;
 645
 646 /* Nonzero if we want to issue diagnostics that the standard says are not
 647    required.  */
 648
 649 extern int flag_optional_diags;
 650
 651 /* Nonzero means we should attempt to elide constructors when possible.  */
 652
 653 extern int flag_elide_constructors;
 654
 655 /* Nonzero means that member functions defined in class scope are
 656    inline by default.  */
 657
 658 extern int flag_default_inline;
 659
 660 /* Controls whether compiler generates 'type descriptor' that give
 661    run-time type information.  */
 662
 663 extern int flag_rtti;
 664
 665 /* Nonzero if we want to conserve space in the .o files.  We do this
 666    by putting uninitialized data and runtime initialized data into
 667    .common instead of .data at the expense of not flagging multiple
 668    definitions.  */
 669
 670 extern int flag_conserve_space;
 671
 672 /* Nonzero if we want to obey access control semantics.  */
 673
 674 extern int flag_access_control;
 675
 676 /* Nonzero if we want to check the return value of new and avoid calling
 677    constructors if it is a null pointer.  */
 678
 679 extern int flag_check_new;
 680
 681 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 682    initialization variables.
 683    0: Old rules, set by -fno-for-scope.
 684    2: New ISO rules, set by -ffor-scope.
 685    1: Try to implement new ISO rules, but with backup compatibility
 686    (and warnings).  This is the default, for now.  */
 687
 688 extern int flag_new_for_scope;
 689
 690 /* Nonzero if we want to emit defined symbols with common-like linkage as
 691    weak symbols where possible, in order to conform to C++ semantics.
 692    Otherwise, emit them as local symbols.  */
 693
 694 extern int flag_weak;
 695
 696 /* 0 means we want the preprocessor to not emit line directives for
 697    the current working directory.  1 means we want it to do it.  -1
 698    means we should decide depending on whether debugging information
 699    is being emitted or not.  */
 700
 701 extern int flag_working_directory;
 702
 703 /* Nonzero to use __cxa_atexit, rather than atexit, to register
 704    destructors for local statics and global objects.  */
 705
 706 extern int flag_use_cxa_atexit;
 707
 708 /* Nonzero means make the default pedwarns warnings instead of errors.
 709    The value of this flag is ignored if -pedantic is specified.  */
 710
 711 extern int flag_permissive;
 712
 713 /* Nonzero means to implement standard semantics for exception
 714    specifications, calling unexpected if an exception is thrown that
 715    doesn't match the specification.  Zero means to treat them as
 716    assertions and optimize accordingly, but not check them.  */
 717
 718 extern int flag_enforce_eh_specs;
 719
 720 /* Nonzero means warn about things that will change when compiling
 721    with an ABI-compliant compiler.  */
 722
 723 extern int warn_abi;
 724
 725 /* Nonzero means warn about invalid uses of offsetof.  */
 726
 727 extern int warn_invalid_offsetof;
 728
 729 /* Nonzero means warn about implicit declarations.  */
 730
 731 extern int warn_implicit;
 732
 733 /* Nonzero means warn when all ctors or dtors are private, and the class
 734    has no friends.  */
 735
 736 extern int warn_ctor_dtor_privacy;
 737
 738 /* Nonzero means warn in function declared in derived class has the
 739    same name as a virtual in the base class, but fails to match the
 740    type signature of any virtual function in the base class.  */
 741
 742 extern int warn_overloaded_virtual;
 743
 744 /* Nonzero means warn when declaring a class that has a non virtual
 745    destructor, when it really ought to have a virtual one.  */
 746
 747 extern int warn_nonvdtor;
 748
 749 /* Nonzero means warn when the compiler will reorder code.  */
 750
 751 extern int warn_reorder;
 752
 753 /* Nonzero means warn when synthesis behavior differs from Cfront's.  */
 754
 755 extern int warn_synth;
 756
 757 /* Nonzero means warn when we convert a pointer to member function
 758    into a pointer to (void or function).  */
 759
 760 extern int warn_pmf2ptr;
 761
 762 /* Nonzero means warn about violation of some Effective C++ style rules.  */
 763
 764 extern int warn_ecpp;
 765
 766 /* Nonzero means warn where overload resolution chooses a promotion from
 767    unsigned to signed over a conversion to an unsigned of the same size.  */
 768
 769 extern int warn_sign_promo;
 770
 771 /* Nonzero means warn when an old-style cast is used.  */
 772
 773 extern int warn_old_style_cast;
 774
 775 /* Nonzero means warn when non-templatized friend functions are
 776    declared within a template */
 777
 778 extern int warn_nontemplate_friend;
 779
 780 /* Nonzero means complain about deprecated features.  */
 781
 782 extern int warn_deprecated;
 783
 784 /* Maximum template instantiation depth.  This limit is rather
 785    arbitrary, but it exists to limit the time it takes to notice
 786    infinite template instantiations.  */
 787
 788 extern int max_tinst_depth;
 789
 790 /* Nonzero means the expression being parsed will never be evaluated.
 791    This is a count, since unevaluated expressions can nest.  */
 792
 793 extern int skip_evaluation;
 794
 795 /* C types are partitioned into three subsets: object, function, and
 796    incomplete types.  */
 797 #define C_TYPE_OBJECT_P(type) \
 798   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 799
 800 #define C_TYPE_INCOMPLETE_P(type) \
 801   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 802
 803 #define C_TYPE_FUNCTION_P(type) \
 804   (TREE_CODE (type) == FUNCTION_TYPE)
 805
 806 /* For convenience we define a single macro to identify the class of
 807    object or incomplete types.  */
 808 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 809   (!C_TYPE_FUNCTION_P (type))
 810
 811 /* Record in each node resulting from a binary operator
 812    what operator was specified for it.  */
 813 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 814
 815 /* Attribute table common to the C front ends.  */
 816 extern const struct attribute_spec c_common_attribute_table[];
 817 extern const struct attribute_spec c_common_format_attribute_table[];
 818
 819 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 820    ID is the identifier to use, NAME is the string.
 821    TYPE_DEP indicates whether it depends on type of the function or not
 822    (i.e. __PRETTY_FUNCTION__).  */
 823
 824 extern tree (*make_fname_decl) (tree, int);
 825
 826 extern tree identifier_global_value (tree);
 827 extern void record_builtin_type (enum rid, const char *, tree);
 828 extern tree build_void_list_node (void);
 829 extern void start_fname_decls (void);
 830 extern void finish_fname_decls (void);
 831 extern const char *fname_as_string (int);
 832 extern tree fname_decl (unsigned, tree);
 833
 834 extern void check_function_arguments (tree, tree);
 835 extern void check_function_arguments_recurse (void (*)
 836                                               (void *, tree,
 837                                                unsigned HOST_WIDE_INT),
 838                                               void *, tree,
 839                                               unsigned HOST_WIDE_INT);
 840 extern void check_function_format (int *, tree, tree);
 841 extern void set_Wformat (int);
 842 extern tree handle_format_attribute (tree *, tree, tree, int, bool *);
 843 extern tree handle_format_arg_attribute (tree *, tree, tree, int, bool *);
 844 extern int c_common_handle_option (size_t code, const char *arg, int value);
 845 extern bool c_common_missing_argument (const char *opt, size_t code);
 846 extern tree c_common_type_for_mode (enum machine_mode, int);
 847 extern tree c_common_type_for_size (unsigned int, int);
 848 extern tree c_common_unsigned_type (tree);
 849 extern tree c_common_signed_type (tree);
 850 extern tree c_common_signed_or_unsigned_type (int, tree);
 851 extern tree c_common_truthvalue_conversion (tree);
 852 extern void c_apply_type_quals_to_decl (int, tree);
 853 extern tree c_sizeof_or_alignof_type (tree, enum tree_code, int);
 854 extern tree c_alignof_expr (tree);
 855 /* Print an error message for invalid operands to arith operation CODE.
 856    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 857 extern void binary_op_error (enum tree_code);
 858 #define my_friendly_assert(EXP, N) (void) \
 859  (((EXP) == 0) ? (fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0) : 0)
 860
 861 extern tree c_expand_expr_stmt (tree);
 862 /* Validate the expression after `case' and apply default promotions.  */
 863 extern tree check_case_value (tree);
 864 extern tree fix_string_type (tree);
 865 struct varray_head_tag;
 866 extern void constant_expression_warning (tree);
 867 extern tree convert_and_check (tree, tree);
 868 extern void overflow_warning (tree);
 869 extern void unsigned_conversion_warning (tree, tree);
 870
 871 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 1)
 872 #define c_alignof(T) c_sizeof_or_alignof_type (T, ALIGNOF_EXPR, 1)
 873
 874 /* Subroutine of build_binary_op, used for comparison operations.
 875    See if the operands have both been converted from subword integer types
 876    and, if so, perhaps change them both back to their original type.  */
 877 extern tree shorten_compare (tree *, tree *, tree *, enum tree_code *);
 878
 879 extern tree pointer_int_sum (enum tree_code, tree, tree);
 880 extern unsigned int min_precision (tree, int);
 881
 882 /* Add qualifiers to a type, in the fashion for C.  */
 883 extern tree c_build_qualified_type (tree, int);
 884
 885 /* Build tree nodes and builtin functions common to both C and C++ language
 886    frontends.  */
 887 extern void c_common_nodes_and_builtins (void);
 888
 889 extern void disable_builtin_function (const char *);
 890
 891 extern tree build_va_arg (tree, tree);
 892
 893 extern unsigned int c_common_init_options (unsigned int, const char **);
 894 extern bool c_common_post_options (const char **);
 895 extern bool c_common_init (void);
 896 extern void c_common_finish (void);
 897 extern void c_common_parse_file (int);
 898 extern HOST_WIDE_INT c_common_get_alias_set (tree);
 899 extern void c_register_builtin_type (tree, const char*);
 900 extern bool c_promoting_integer_type_p (tree);
 901 extern int self_promoting_args_p (tree);
 902 extern tree strip_array_types (tree);
 903 extern tree strip_pointer_operator (tree);
 904
 905 /* This is the basic parsing function.  */
 906 extern void c_parse_file (void);
 907 /* This is misnamed, it actually performs end-of-compilation processing.  */
 908 extern void finish_file (void);
 909
 910 /* These macros provide convenient access to the various _STMT nodes.  */
 911
 912 /* Nonzero if this statement should be considered a full-expression,
 913    i.e., if temporaries created during this statement should have
 914    their destructors run at the end of this statement.  (In C, this
 915    will always be false, since there are no destructors.)  */
 916 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 917
 918 /* Nonzero if a given STATEMENT_LIST represents the outermost binding
 919    if a statement expression.  */
 920 #define STATEMENT_LIST_STMT_EXPR(NODE) \
 921   TREE_LANG_FLAG_1 (STATEMENT_LIST_CHECK (NODE))
 922
 923 /* IF_STMT accessors. These give access to the condition of the if
 924    statement, the then block of the if statement, and the else block
 925    of the if statement if it exists.  */
 926 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 927 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 928 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 929
 930 /* WHILE_STMT accessors. These give access to the condition of the
 931    while statement and the body of the while statement, respectively.  */
 932 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 933 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 934
 935 /* DO_STMT accessors. These give access to the condition of the do
 936    statement and the body of the do statement, respectively.  */
 937 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 938 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 939
 940 /* RETURN_STMT accessors. These give the expression associated with a
 941    return statement, and whether it should be ignored when expanding
 942    (as opposed to inlining).  */
 943 #define RETURN_STMT_EXPR(NODE)  TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 944
 945 /* EXPR_STMT accessor. This gives the expression associated with an
 946    expression statement.  */
 947 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 948
 949 /* FOR_STMT accessors. These give access to the init statement,
 950    condition, update expression, and body of the for statement,
 951    respectively.  */
 952 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 953 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 954 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 955 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 956
 957 #define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
 958
 959 /* DECL_STMT accessor. This gives access to the DECL associated with
 960    the given declaration statement.  */
 961 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
 962
 963 /* STMT_EXPR accessor.  */
 964 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 965
 966 /* Nonzero if this statement-expression does not have an associated scope.  */
 967 #define STMT_EXPR_NO_SCOPE(NODE) \
 968    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
 969
 970 /* COMPOUND_LITERAL_EXPR accessors.  */
 971 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 972   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 973 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 974   DECL_STMT_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 975
 976 /* The body of the CLEANUP_STMT.  */
 977 #define CLEANUP_BODY(NODE) \
 978   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
 979 /* The cleanup to run in a CLEANUP_STMT.  */
 980 #define CLEANUP_EXPR(NODE) \
 981   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
 982 /* The VAR_DECL to clean up in a CLEANUP_STMT.  */
 983 #define CLEANUP_DECL(NODE) \
 984   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 2)
 985
 986 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 987
 988 enum c_tree_code {
 989   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 990 #include "c-common.def"
 991   LAST_C_TREE_CODE
 992 };
 993
 994 #undef DEFTREECODE
 995
 996 #define c_common_stmt_codes                             \
 997    CLEANUP_STMT,        EXPR_STMT,                      \
 998    DECL_STMT,           IF_STMT,        FOR_STMT,       \
 999    WHILE_STMT,          DO_STMT,        RETURN_STMT,    \
1000    BREAK_STMT,          CONTINUE_STMT,  SWITCH_STMT
1001
1002 /* TRUE if a code represents a statement.  The front end init
1003    langhook should take care of initialization of this array.  */
1004 extern bool statement_code_p[MAX_TREE_CODES];
1005
1006 #define STATEMENT_CODE_P(CODE) statement_code_p[(int) (CODE)]
1007
1008 #define INIT_STATEMENT_CODES(STMT_CODES)                        \
1009   do {                                                          \
1010     unsigned int i;                                             \
1011     memset (&statement_code_p, 0, sizeof (statement_code_p));   \
1012     for (i = 0; i < ARRAY_SIZE (STMT_CODES); i++)               \
1013       statement_code_p[STMT_CODES[i]] = true;                   \
1014   } while (0)
1015
1016 extern int stmts_are_full_exprs_p (void);
1017 extern int anon_aggr_type_p (tree);
1018
1019 /* For a VAR_DECL that is an anonymous union, these are the various
1020    sub-variables that make up the anonymous union.  */
1021 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
1022
1023 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
1024 #define DECL_C_BIT_FIELD(NODE) \
1025   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
1026 #define SET_DECL_C_BIT_FIELD(NODE) \
1027   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
1028 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
1029   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
1030
1031 extern void emit_local_var (tree);
1032 extern void make_rtl_for_local_static (tree);
1033 extern tree c_expand_return (tree);
1034 extern tree do_case (tree, tree);
1035 extern tree build_stmt (enum tree_code, ...);
1036 extern tree build_case_label (tree, tree, tree);
1037 extern tree build_continue_stmt (void);
1038 extern tree build_break_stmt (void);
1039 extern tree build_return_stmt (tree);
1040
1041 extern void c_expand_asm_operands (tree, tree, tree, tree, int, location_t);
1042
1043 /* These functions must be defined by each front-end which implements
1044    a variant of the C language.  They are used in c-common.c.  */
1045
1046 extern tree build_unary_op (enum tree_code, tree, int);
1047 extern tree build_binary_op (enum tree_code, tree, tree, int);
1048 extern int lvalue_p (tree);
1049 extern tree default_conversion (tree);
1050
1051 /* Given two integer or real types, return the type for their sum.
1052    Given two compatible ANSI C types, returns the merged type.  */
1053
1054 extern tree common_type (tree, tree);
1055
1056 extern tree expand_tree_builtin (tree, tree, tree);
1057
1058 extern tree decl_constant_value (tree);
1059
1060 /* Handle increment and decrement of boolean types.  */
1061 extern tree boolean_increment (enum tree_code, tree);
1062
1063 /* Hook currently used only by the C++ front end to reset internal state
1064    after entering or leaving a header file.  */
1065 extern void extract_interface_info (void);
1066
1067 extern int case_compare (splay_tree_key, splay_tree_key);
1068
1069 extern tree c_add_case_label (splay_tree, tree, tree, tree);
1070
1071 extern void c_do_switch_warnings (splay_tree, tree);
1072
1073 extern tree build_function_call (tree, tree);
1074
1075 extern tree finish_label_address_expr (tree);
1076
1077 /* Same function prototype, but the C and C++ front ends have
1078    different implementations.  Used in c-common.c.  */
1079 extern tree lookup_label (tree);
1080
1081 extern int vector_types_convertible_p (tree t1, tree t2);
1082
1083 extern rtx c_expand_expr (tree, rtx, enum machine_mode, int, rtx *);
1084
1085 extern int c_safe_from_p (rtx, tree);
1086
1087 extern int c_staticp (tree);
1088
1089 extern int c_common_unsafe_for_reeval (tree);
1090
1091 extern void init_c_lex (void);
1092
1093 extern void c_cpp_builtins (cpp_reader *);
1094
1095 /* Positive if an implicit `extern "C"' scope has just been entered;
1096    negative if such a scope has just been exited.  */
1097 extern GTY(()) int pending_lang_change;
1098
1099 /* Information recorded about each file examined during compilation.  */
1100
1101 struct c_fileinfo
1102 {
1103   int time;     /* Time spent in the file.  */
1104   short interface_only;         /* Flags - used only by C++ */
1105   short interface_unknown;
1106 };
1107
1108 struct c_fileinfo *get_fileinfo (const char *);
1109 extern void dump_time_statistics (void);
1110
1111 extern bool c_dump_tree (void *, tree);
1112
1113 extern int c_gimplify_expr (tree *, tree *, tree *);
1114 extern tree c_walk_subtrees (tree*, int*, walk_tree_fn, void*, void*);
1115
1116 extern void c_warn_unused_result (tree *);
1117
1118 /* In c-simplify.c  */
1119 extern void c_genericize (tree);
1120 extern int c_gimplify_stmt (tree *);
1121 extern tree c_build_bind_expr (tree, tree);
1122
1123 extern void pch_init (void);
1124 extern int c_common_valid_pch (cpp_reader *pfile, const char *name, int fd);
1125 extern void c_common_read_pch (cpp_reader *pfile, const char *name, int fd,
1126                                const char *orig);
1127 extern void c_common_write_pch (void);
1128 extern void c_common_no_more_pch (void);
1129 extern void builtin_define_with_value (const char *, const char *, int);
1130 extern void c_stddef_cpp_builtins (void);
1131 extern void fe_file_change (const struct line_map *);
1132 extern void c_parse_error (const char *, enum cpp_ttype, tree);
1133
1134 /* The following have been moved here from c-tree.h, since they're needed
1135    in the ObjC++ world, too.  What is more, stub-objc.c could use a few
1136    prototypes.  */
1137 extern tree lookup_interface (tree);
1138 extern tree is_class_name (tree);
1139 extern tree objc_is_object_ptr (tree);
1140 extern void objc_check_decl (tree);
1141 extern int objc_comptypes (tree, tree, int);
1142 extern tree objc_message_selector (void);
1143 extern tree lookup_objc_ivar (tree);
1144 extern void *get_current_scope (void);
1145 extern void objc_mark_locals_volatile (void *);
1146 extern void objc_clear_super_receiver (void);
1147 extern int objc_is_public (tree, tree);
1148
1149 /* In c-ppoutput.c  */
1150 extern void init_pp_output (FILE *);
1151 extern void preprocess_file (cpp_reader *);
1152 extern void pp_file_change (const struct line_map *);
1153 extern void pp_dir_change (cpp_reader *, const char *);
1154
1155 #endif /* ! GCC_C_COMMON_H */