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