gcc/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002 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
  28 /* Usage of TREE_LANG_FLAG_?:
  29    0: COMPOUND_STMT_NO_SCOPE (in COMPOUND_STMT).
  30       TREE_NEGATED_INT (in INTEGER_CST).
  31       IDENTIFIER_MARKED (used by search routines).
  32       SCOPE_BEGIN_P (in SCOPE_STMT)
  33       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  34       NEW_FOR_SCOPE_P (in FOR_STMT)
  35       ASM_INPUT_P (in ASM_STMT)
  36       STMT_EXPR_NO_SCOPE (in STMT_EXPR)
  37    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  38       STMT_IS_FULL_EXPR_P (in _STMT)
  39    2: STMT_LINENO_FOR_FN_P (in _STMT)
  40    3: SCOPE_NO_CLEANUPS_P (in SCOPE_STMT)
  41       COMPOUND_STMT_BODY_BLOCK (in COMPOUND_STMT)
  42    4: SCOPE_PARTIAL_P (in SCOPE_STMT)
  43 */
  44
  45 /* Reserved identifiers.  This is the union of all the keywords for C,
  46    C++, and Objective C.  All the type modifiers have to be in one
  47    block at the beginning, because they are used as mask bits.  There
  48    are 27 type modifiers; if we add many more we will have to redesign
  49    the mask mechanism.  */
  50
  51 enum rid
  52 {
  53   /* Modifiers: */
  54   /* C, in empirical order of frequency.  */
  55   RID_STATIC = 0,
  56   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  57   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  58   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  59
  60   /* C extensions */
  61   RID_BOUNDED, RID_UNBOUNDED, RID_COMPLEX, RID_THREAD,
  62
  63   /* C++ */
  64   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  65
  66   /* ObjC */
  67   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  68
  69   /* C */
  70   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  71   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  72   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  73   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  74   RID_SIZEOF,
  75
  76   /* C extensions */
  77   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  78   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_PTRBASE,
  79   RID_PTREXTENT, RID_PTRVALUE, RID_CHOOSE_EXPR, RID_TYPES_COMPATIBLE_P,
  80
  81   /* Too many ways of getting the name of a function as a string */
  82   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  83
  84   /* C++ */
  85   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  86   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  87   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  88   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  89   RID_NEW,      RID_OPERATOR, RID_THIS,
  90   RID_THROW,    RID_TRUE,     RID_TRY,
  91   RID_TYPENAME, RID_TYPEID,   RID_USING,
  92
  93   /* casts */
  94   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  95
  96   /* Objective C */
  97   RID_ID,          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,  RID_AT_INTERFACE,
 101   RID_AT_IMPLEMENTATION,
 102
 103   RID_MAX,
 104
 105   RID_FIRST_MODIFIER = RID_STATIC,
 106   RID_LAST_MODIFIER = RID_ONEWAY,
 107
 108   RID_FIRST_AT = RID_AT_ENCODE,
 109   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 110   RID_FIRST_PQ = RID_IN,
 111   RID_LAST_PQ = RID_ONEWAY
 112 };
 113
 114 #define OBJC_IS_AT_KEYWORD(rid) \
 115   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 116    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 117
 118 #define OBJC_IS_PQ_KEYWORD(rid) \
 119   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 120    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 121
 122 /* The elements of `ridpointers' are identifier nodes for the reserved
 123    type names and storage classes.  It is indexed by a RID_... value.  */
 124 extern tree *ridpointers;
 125
 126 /* Standard named or nameless data types of the C compiler.  */
 127
 128 enum c_tree_index
 129 {
 130     CTI_WCHAR_TYPE,
 131     CTI_SIGNED_WCHAR_TYPE,
 132     CTI_UNSIGNED_WCHAR_TYPE,
 133     CTI_WINT_TYPE,
 134     CTI_C_SIZE_TYPE, /* The type used for the size_t typedef and the
 135                         result type of sizeof (an ordinary type without
 136                         TYPE_IS_SIZETYPE set, unlike the internal
 137                         sizetype).  */
 138     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 139     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 140     CTI_INTMAX_TYPE,
 141     CTI_UINTMAX_TYPE,
 142     CTI_WIDEST_INT_LIT_TYPE,
 143     CTI_WIDEST_UINT_LIT_TYPE,
 144
 145     CTI_CHAR_ARRAY_TYPE,
 146     CTI_WCHAR_ARRAY_TYPE,
 147     CTI_INT_ARRAY_TYPE,
 148     CTI_STRING_TYPE,
 149     CTI_CONST_STRING_TYPE,
 150
 151     /* Type for boolean expressions (bool in C++, int in C).  */
 152     CTI_BOOLEAN_TYPE,
 153     CTI_BOOLEAN_TRUE,
 154     CTI_BOOLEAN_FALSE,
 155     /* C99's _Bool type.  */
 156     CTI_C_BOOL_TYPE,
 157     CTI_C_BOOL_TRUE,
 158     CTI_C_BOOL_FALSE,
 159     CTI_DEFAULT_FUNCTION_TYPE,
 160
 161     CTI_G77_INTEGER_TYPE,
 162     CTI_G77_UINTEGER_TYPE,
 163     CTI_G77_LONGINT_TYPE,
 164     CTI_G77_ULONGINT_TYPE,
 165
 166     /* These are not types, but we have to look them up all the time.  */
 167     CTI_FUNCTION_NAME_DECL,
 168     CTI_PRETTY_FUNCTION_NAME_DECL,
 169     CTI_C99_FUNCTION_NAME_DECL,
 170     CTI_SAVED_FUNCTION_NAME_DECLS,
 171
 172     CTI_VOID_ZERO,
 173
 174     CTI_MAX
 175 };
 176
 177 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 178
 179 /* Identifier part common to the C front ends.  Inherits from
 180    tree_identifier, despite appearances.  */
 181 struct c_common_identifier GTY(())
 182 {
 183   struct tree_common common;
 184   struct cpp_hashnode GTY ((skip (""))) node;
 185 };
 186
 187 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 188 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 189 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 190 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 191 #define c_size_type_node                c_global_trees[CTI_C_SIZE_TYPE]
 192 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 193 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 194 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 195 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 196 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 197 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 198
 199 #define boolean_type_node               c_global_trees[CTI_BOOLEAN_TYPE]
 200 #define boolean_true_node               c_global_trees[CTI_BOOLEAN_TRUE]
 201 #define boolean_false_node              c_global_trees[CTI_BOOLEAN_FALSE]
 202
 203 #define c_bool_type_node                c_global_trees[CTI_C_BOOL_TYPE]
 204 #define c_bool_true_node                c_global_trees[CTI_C_BOOL_TRUE]
 205 #define c_bool_false_node               c_global_trees[CTI_C_BOOL_FALSE]
 206
 207 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 208 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 209 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 210 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 211 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 212
 213 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 214
 215 /* g77 integer types, which which must be kept in sync with f/com.h */
 216 #define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
 217 #define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
 218 #define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
 219 #define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
 220
 221 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 222 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 223 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 224 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 225
 226 /* A node for `((void) 0)'.  */
 227 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 228
 229 extern GTY(()) tree c_global_trees[CTI_MAX];
 230
 231 /* Mark which labels are explicitly declared.
 232    These may be shadowed, and may be referenced from nested functions.  */
 233 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 234
 235 /* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
 236    warning if they undergo concatenation.  */
 237 #define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
 238
 239 typedef enum c_language_kind
 240 {
 241   clk_c,           /* A dialect of C: K&R C, ANSI/ISO C89, C2000,
 242                        etc.  */
 243   clk_cplusplus,   /* ANSI/ISO C++ */
 244   clk_objective_c  /* Objective C */
 245 }
 246 c_language_kind;
 247
 248 /* Information about a statement tree.  */
 249
 250 struct stmt_tree_s GTY(()) {
 251   /* The last statement added to the tree.  */
 252   tree x_last_stmt;
 253   /* The type of the last expression statement.  (This information is
 254      needed to implement the statement-expression extension.)  */
 255   tree x_last_expr_type;
 256   /* The last filename we recorded.  */
 257   const char *x_last_expr_filename;
 258   /* In C++, Non-zero if we should treat statements as full
 259      expressions.  In particular, this variable is no-zero if at the
 260      end of a statement we should destroy any temporaries created
 261      during that statement.  Similarly, if, at the end of a block, we
 262      should destroy any local variables in this block.  Normally, this
 263      variable is non-zero, since those are the normal semantics of
 264      C++.
 265
 266      However, in order to represent aggregate initialization code as
 267      tree structure, we use statement-expressions.  The statements
 268      within the statement expression should not result in cleanups
 269      being run until the entire enclosing statement is complete.
 270
 271      This flag has no effect in C.  */
 272   int stmts_are_full_exprs_p;
 273 };
 274
 275 typedef struct stmt_tree_s *stmt_tree;
 276
 277 /* Global state pertinent to the current function.  Some C dialects
 278    extend this structure with additional fields.  */
 279
 280 struct c_language_function GTY(()) {
 281   /* While we are parsing the function, this contains information
 282      about the statement-tree that we are building.  */
 283   struct stmt_tree_s x_stmt_tree;
 284   /* The stack of SCOPE_STMTs for the current function.  */
 285   tree x_scope_stmt_stack;
 286 };
 287
 288 /* When building a statement-tree, this is the last statement added to
 289    the tree.  */
 290
 291 #define last_tree (current_stmt_tree ()->x_last_stmt)
 292
 293 /* The type of the last expression-statement we have seen.  */
 294
 295 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 296
 297 /* The name of the last file we have seen.  */
 298
 299 #define last_expr_filename (current_stmt_tree ()->x_last_expr_filename)
 300
 301 /* LAST_TREE contains the last statement parsed.  These are chained
 302    together through the TREE_CHAIN field, but often need to be
 303    re-organized since the parse is performed bottom-up.  This macro
 304    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 305
 306 #define RECHAIN_STMTS(stmt, substmt)            \
 307   do {                                          \
 308     substmt = TREE_CHAIN (stmt);                \
 309     TREE_CHAIN (stmt) = NULL_TREE;              \
 310     last_tree = stmt;                           \
 311   } while (0)
 312
 313 /* Language-specific hooks.  */
 314
 315 extern int (*lang_statement_code_p)             PARAMS ((enum tree_code));
 316 extern void (*lang_expand_stmt)                 PARAMS ((tree));
 317 extern void (*lang_expand_decl_stmt)            PARAMS ((tree));
 318 extern void (*lang_expand_function_end)         PARAMS ((void));
 319 extern tree gettags                             PARAMS ((void));
 320
 321 /* Callback that determines if it's ok for a function to have no
 322    noreturn attribute.  */
 323 extern int (*lang_missing_noreturn_ok_p)        PARAMS ((tree));
 324
 325 extern int yyparse                              PARAMS ((void));
 326 extern void free_parser_stacks                  PARAMS ((void));
 327
 328 extern stmt_tree current_stmt_tree              PARAMS ((void));
 329 extern tree *current_scope_stmt_stack           PARAMS ((void));
 330 extern void begin_stmt_tree                     PARAMS ((tree *));
 331 extern tree add_stmt                            PARAMS ((tree));
 332 extern void add_decl_stmt                       PARAMS ((tree));
 333 extern tree add_scope_stmt                      PARAMS ((int, int));
 334 extern void finish_stmt_tree                    PARAMS ((tree *));
 335
 336 extern int statement_code_p                     PARAMS ((enum tree_code));
 337 extern tree walk_stmt_tree                      PARAMS ((tree *,
 338                                                          walk_tree_fn,
 339                                                          void *));
 340 extern void prep_stmt                           PARAMS ((tree));
 341 extern void expand_stmt                         PARAMS ((tree));
 342 extern void shadow_warning                      PARAMS ((const char *,
 343                                                          tree, tree));
 344 extern tree c_begin_if_stmt                     PARAMS ((void));
 345 extern tree c_begin_while_stmt                  PARAMS ((void));
 346 extern void c_finish_while_stmt_cond            PARAMS ((tree, tree));
 347
 348
 349 /* Extra information associated with a DECL.  Other C dialects extend
 350    this structure in various ways.  The C front-end only uses this
 351    structure for FUNCTION_DECLs; all other DECLs have a NULL
 352    DECL_LANG_SPECIFIC field.  */
 353
 354 struct c_lang_decl GTY(()) {
 355   unsigned declared_inline : 1;
 356 };
 357
 358 /* In a FUNCTION_DECL for which DECL_BUILT_IN does not hold, this is
 359      the approximate number of statements in this function.  There is
 360      no need for this number to be exact; it is only used in various
 361      heuristics regarding optimization.  */
 362 #define DECL_NUM_STMTS(NODE) \
 363   (FUNCTION_DECL_CHECK (NODE)->decl.u1.i)
 364
 365 /* The variant of the C language being processed.  Each C language
 366    front-end defines this variable.  */
 367
 368 extern c_language_kind c_language;
 369
 370 /* Nonzero if prepreprocessing only.  */
 371 extern int flag_preprocess_only;
 372
 373 /* Nonzero if an ISO standard was selected.  It rejects macros in the
 374    user's namespace.  */
 375 extern int flag_iso;
 376
 377 /* Nonzero if -undef was given.  It suppresses target built-in macros
 378    and assertions.  */
 379 extern int flag_undef;
 380
 381 /* Nonzero means give string constants the type `const char *', rather
 382    than `char *'.  */
 383
 384 extern int flag_const_strings;
 385
 386 /* Nonzero means give `double' the same size as `float'.  */
 387
 388 extern int flag_short_double;
 389
 390 /* Nonzero means give `wchar_t' the same size as `short'.  */
 391
 392 extern int flag_short_wchar;
 393
 394 /* Nonzero means allow Microsoft extensions without warnings or errors.  */
 395 extern int flag_ms_extensions;
 396
 397 /* Nonzero means warn about use of multicharacter literals.  */
 398 extern int warn_multichar;
 399
 400 /* Warn about *printf or *scanf format/argument anomalies.  */
 401
 402 extern int warn_format;
 403
 404 /* Warn about Y2K problems with strftime formats.  */
 405
 406 extern int warn_format_y2k;
 407
 408 /* Warn about excess arguments to formats.  */
 409
 410 extern int warn_format_extra_args;
 411
 412 /* Warn about zero-length formats.  */
 413
 414 extern int warn_format_zero_length;
 415
 416 /* Warn about non-literal format arguments.  */
 417
 418 extern int warn_format_nonliteral;
 419
 420 /* Warn about possible security problems with calls to format functions.  */
 421
 422 extern int warn_format_security;
 423
 424 /* Warn about NULL being passed to argument slots marked as requiring
 425    non-NULL.  */
 426
 427 extern int warn_nonnull;
 428
 429 /* Warn about possible violations of sequence point rules.  */
 430
 431 extern int warn_sequence_point;
 432
 433 /* Warn about functions which might be candidates for format attributes.  */
 434
 435 extern int warn_missing_format_attribute;
 436
 437 /* Nonzero means warn about sizeof (function) or addition/subtraction
 438    of function pointers.  */
 439
 440 extern int warn_pointer_arith;
 441
 442 /* Nonzero means to warn about compile-time division by zero.  */
 443 extern int warn_div_by_zero;
 444
 445 /* Nonzero means enable C89 Amendment 1 features.  */
 446
 447 extern int flag_isoc94;
 448
 449 /* Nonzero means use the ISO C99 dialect of C.  */
 450
 451 extern int flag_isoc99;
 452
 453 /* Nonzero means environment is hosted (i.e., not freestanding) */
 454
 455 extern int flag_hosted;
 456
 457 /* Nonzero means add default format_arg attributes for functions not
 458    in ISO C.  */
 459
 460 extern int flag_noniso_default_format_attributes;
 461
 462 /* Nonzero means don't recognize any builtin functions.  */
 463
 464 extern int flag_no_builtin;
 465
 466 /* Nonzero means don't recognize the non-ANSI builtin functions.
 467    -ansi sets this.  */
 468
 469 extern int flag_no_nonansi_builtin;
 470
 471 /* Nonzero means warn about suggesting putting in ()'s.  */
 472
 473 extern int warn_parentheses;
 474
 475 /* Warn if a type conversion is done that might have confusing results.  */
 476
 477 extern int warn_conversion;
 478
 479 /* Nonzero means warn about usage of long long,
 480    when `-pedantic' and not C99.  */
 481
 482 extern int warn_long_long;
 483
 484 /* C types are partitioned into three subsets: object, function, and
 485    incomplete types.  */
 486 #define C_TYPE_OBJECT_P(type) \
 487   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 488
 489 #define C_TYPE_INCOMPLETE_P(type) \
 490   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 491
 492 #define C_TYPE_FUNCTION_P(type) \
 493   (TREE_CODE (type) == FUNCTION_TYPE)
 494
 495 /* For convenience we define a single macro to identify the class of
 496    object or incomplete types.  */
 497 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 498   (!C_TYPE_FUNCTION_P (type))
 499
 500 /* Record in each node resulting from a binary operator
 501    what operator was specified for it.  */
 502 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 503
 504 /* Attribute table common to the C front ends.  */
 505 extern const struct attribute_spec c_common_attribute_table[];
 506 extern const struct attribute_spec c_common_format_attribute_table[];
 507
 508 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 509    ID is the identifier to use, NAME is the string.
 510    TYPE_DEP indicates whether it depends on type of the function or not
 511    (i.e. __PRETTY_FUNCTION__).  */
 512
 513 extern tree (*make_fname_decl)                  PARAMS ((tree, int));
 514
 515 extern tree identifier_global_value             PARAMS ((tree));
 516 extern void record_builtin_type                 PARAMS ((enum rid,
 517                                                          const char *, tree));
 518 extern tree build_void_list_node                PARAMS ((void));
 519 extern void start_fname_decls                   PARAMS ((void));
 520 extern void finish_fname_decls                  PARAMS ((void));
 521 extern const char *fname_as_string              PARAMS ((int));
 522 extern tree fname_decl                          PARAMS ((unsigned, tree));
 523 extern const char *fname_string                 PARAMS ((unsigned));
 524
 525 extern void check_function_arguments            PARAMS ((tree, tree));
 526 extern void check_function_arguments_recurse    PARAMS ((void (*) (void *,
 527                                                                    tree,
 528                                                                    unsigned HOST_WIDE_INT),
 529                                                          void *, tree,
 530                                                          unsigned HOST_WIDE_INT));
 531 extern void check_function_format               PARAMS ((int *, tree, tree));
 532 extern void set_Wformat                         PARAMS ((int));
 533 extern tree handle_format_attribute             PARAMS ((tree *, tree, tree,
 534                                                          int, bool *));
 535 extern tree handle_format_arg_attribute         PARAMS ((tree *, tree, tree,
 536                                                          int, bool *));
 537 extern void c_common_insert_default_attributes  PARAMS ((tree));
 538 extern tree c_common_type_for_mode              PARAMS ((enum machine_mode,
 539                                                          int));
 540 extern tree c_common_type_for_size              PARAMS ((unsigned int, int));
 541 extern tree c_common_unsigned_type              PARAMS ((tree));
 542 extern tree c_common_signed_type                PARAMS ((tree));
 543 extern tree c_common_signed_or_unsigned_type    PARAMS ((int, tree));
 544 extern tree c_common_truthvalue_conversion      PARAMS ((tree));
 545 extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
 546 extern tree c_sizeof_or_alignof_type    PARAMS ((tree, enum tree_code, int));
 547 extern tree c_alignof_expr                      PARAMS ((tree));
 548 /* Print an error message for invalid operands to arith operation CODE.
 549    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 550 extern void binary_op_error                     PARAMS ((enum tree_code));
 551 #define my_friendly_assert(EXP, N) (void) \
 552  (((EXP) == 0) ? (fancy_abort (__FILE__, __LINE__, __FUNCTION__), 0) : 0)
 553
 554 extern tree c_expand_expr_stmt                  PARAMS ((tree));
 555 extern void c_expand_start_cond                 PARAMS ((tree, int, tree));
 556 extern void c_finish_then                       PARAMS ((void));
 557 extern void c_expand_start_else                 PARAMS ((void));
 558 extern void c_finish_else                       PARAMS ((void));
 559 extern void c_expand_end_cond                   PARAMS ((void));
 560 /* Validate the expression after `case' and apply default promotions.  */
 561 extern tree check_case_value                    PARAMS ((tree));
 562 extern tree fix_string_type                     PARAMS ((tree));
 563 struct varray_head_tag;
 564 extern tree combine_strings             PARAMS ((struct varray_head_tag *));
 565 extern void constant_expression_warning         PARAMS ((tree));
 566 extern tree convert_and_check                   PARAMS ((tree, tree));
 567 extern void overflow_warning                    PARAMS ((tree));
 568 extern void unsigned_conversion_warning         PARAMS ((tree, tree));
 569
 570 /* Read the rest of the current #-directive line.  */
 571 extern char *get_directive_line                 PARAMS ((void));
 572 #define GET_DIRECTIVE_LINE() get_directive_line ()
 573 #define c_sizeof(T)  c_sizeof_or_alignof_type (T, SIZEOF_EXPR, 1)
 574 #define c_alignof(T) c_sizeof_or_alignof_type (T, ALIGNOF_EXPR, 1)
 575
 576 /* Subroutine of build_binary_op, used for comparison operations.
 577    See if the operands have both been converted from subword integer types
 578    and, if so, perhaps change them both back to their original type.  */
 579 extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
 580
 581 extern tree pointer_int_sum                     PARAMS ((enum tree_code, tree, tree));
 582 extern unsigned int min_precision               PARAMS ((tree, int));
 583
 584 /* Add qualifiers to a type, in the fashion for C.  */
 585 extern tree c_build_qualified_type              PARAMS ((tree, int));
 586
 587 /* Build tree nodes and builtin functions common to both C and C++ language
 588    frontends.  */
 589 extern void c_common_nodes_and_builtins         PARAMS ((void));
 590
 591 extern void disable_builtin_function            PARAMS ((const char *));
 592
 593 extern tree build_va_arg                        PARAMS ((tree, tree));
 594
 595 extern void c_common_init_options               PARAMS ((enum c_language_kind));
 596 extern bool c_common_post_options               PARAMS ((void));
 597 extern const char *c_common_init                PARAMS ((const char *));
 598 extern void c_common_finish                     PARAMS ((void));
 599 extern void c_common_parse_file                 PARAMS ((int));
 600 extern HOST_WIDE_INT c_common_get_alias_set     PARAMS ((tree));
 601 extern bool c_promoting_integer_type_p          PARAMS ((tree));
 602 extern int self_promoting_args_p                PARAMS ((tree));
 603 extern tree strip_array_types                   PARAMS ((tree));
 604
 605 /* These macros provide convenient access to the various _STMT nodes.  */
 606
 607 /* Nonzero if this statement should be considered a full-expression,
 608    i.e., if temporaries created during this statement should have
 609    their destructors run at the end of this statement.  (In C, this
 610    will always be false, since there are no destructors.)  */
 611 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 612
 613 /* IF_STMT accessors. These give access to the condition of the if
 614    statement, the then block of the if statement, and the else block
 615    of the if statement if it exists.  */
 616 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 617 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 618 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 619
 620 /* WHILE_STMT accessors. These give access to the condition of the
 621    while statement and the body of the while statement, respectively.  */
 622 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 623 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 624
 625 /* DO_STMT accessors. These give access to the condition of the do
 626    statement and the body of the do statement, respectively.  */
 627 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 628 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 629
 630 /* RETURN_STMT accessors. These give the expression associated with a
 631    return statement, and whether it should be ignored when expanding
 632    (as opposed to inlining).  */
 633 #define RETURN_EXPR(NODE)       TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 634
 635 /* EXPR_STMT accessor. This gives the expression associated with an
 636    expression statement.  */
 637 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 638
 639 /* FOR_STMT accessors. These give access to the init statement,
 640    condition, update expression, and body of the for statement,
 641    respectively.  */
 642 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 643 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 644 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 645 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 646
 647 /* SWITCH_STMT accessors. These give access to the condition, body and
 648    original condition type (before any compiler conversions)
 649    of the switch statement, respectively.  */
 650 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
 651 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
 652 #define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
 653
 654 /* CASE_LABEL accessors. These give access to the high and low values
 655    of a case label, respectively.  */
 656 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
 657 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
 658 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
 659
 660 /* GOTO_STMT accessor. This gives access to the label associated with
 661    a goto statement.  */
 662 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
 663 /* True for goto created artifically by the compiler.  */
 664 #define GOTO_FAKE_P(NODE)       (TREE_LANG_FLAG_0 (GOTO_STMT_CHECK (NODE)))
 665
 666 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
 667    statements associated with a compound statement. The result is the
 668    first statement in the list. Succeeding nodes can be accessed by
 669    calling TREE_CHAIN on a node in the list.  */
 670 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
 671
 672 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
 673    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
 674    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
 675    statement.  */
 676 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
 677 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
 678 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
 679 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
 680 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
 681
 682 /* DECL_STMT accessor. This gives access to the DECL associated with
 683    the given declaration statement.  */
 684 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
 685
 686 /* STMT_EXPR accessor.  */
 687 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 688
 689 /* Nonzero if this statement-expression does not have an associated scope.  */
 690 #define STMT_EXPR_NO_SCOPE(NODE) \
 691    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
 692
 693 /* LABEL_STMT accessor. This gives access to the label associated with
 694    the given label statement.  */
 695 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
 696
 697 /* COMPOUND_LITERAL_EXPR accessors.  */
 698 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 699   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 700 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 701   DECL_STMT_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 702
 703 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
 704 #define SCOPE_BEGIN_P(NODE) \
 705   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
 706
 707 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
 708 #define SCOPE_END_P(NODE) \
 709   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
 710
 711 /* The BLOCK containing the declarations contained in this scope.  */
 712 #define SCOPE_STMT_BLOCK(NODE) \
 713   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
 714
 715 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
 716 #define SCOPE_NULLIFIED_P(NODE) \
 717   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
 718
 719 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
 720    which should be treated as non-existent from the point of view of
 721    running cleanup actions.  */
 722 #define SCOPE_NO_CLEANUPS_P(NODE) \
 723   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
 724
 725 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
 726    For example, in:
 727
 728      S s;
 729      l:
 730      S s2;
 731      goto l;
 732
 733    there is (implicitly) a new scope after `l', even though there are
 734    no curly braces.  In particular, when we hit the goto, we must
 735    destroy s2 and then re-construct it.  For the implicit scope,
 736    SCOPE_PARTIAL_P will be set.  */
 737 #define SCOPE_PARTIAL_P(NODE) \
 738   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
 739
 740 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
 741 #define ASM_VOLATILE_P(NODE)                    \
 742   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
 743
 744 /* The VAR_DECL to clean up in a CLEANUP_STMT.  */
 745 #define CLEANUP_DECL(NODE) \
 746   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
 747 /* The cleanup to run in a CLEANUP_STMT.  */
 748 #define CLEANUP_EXPR(NODE) \
 749   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
 750
 751 /* The filename we are changing to as of this FILE_STMT.  */
 752 #define FILE_STMT_FILENAME_NODE(NODE) \
 753   (TREE_OPERAND (FILE_STMT_CHECK (NODE), 0))
 754 #define FILE_STMT_FILENAME(NODE) \
 755   (IDENTIFIER_POINTER (FILE_STMT_FILENAME_NODE (NODE)))
 756
 757 /* The line-number at which a statement began.  But if
 758    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
 759    line number for the end of the current function instead.  */
 760 #define STMT_LINENO(NODE)                       \
 761   (TREE_COMPLEXITY ((NODE)))
 762
 763 /* If non-zero, the STMT_LINENO for NODE is the line at which the
 764    function ended.  */
 765 #define STMT_LINENO_FOR_FN_P(NODE)              \
 766   (TREE_LANG_FLAG_2 ((NODE)))
 767
 768 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 769    initialization variables.  */
 770 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 771
 772 /* Nonzero if we want to create an ASM_INPUT instead of an
 773    ASM_OPERAND with no operands.  */
 774 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 775
 776 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 777
 778 enum c_tree_code {
 779   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 780 #include "c-common.def"
 781   LAST_C_TREE_CODE
 782 };
 783
 784 #undef DEFTREECODE
 785
 786 extern void genrtl_do_pushlevel                 PARAMS ((void));
 787 extern void genrtl_goto_stmt                    PARAMS ((tree));
 788 extern void genrtl_expr_stmt                    PARAMS ((tree));
 789 extern void genrtl_expr_stmt_value              PARAMS ((tree, int, int));
 790 extern void genrtl_decl_stmt                    PARAMS ((tree));
 791 extern void genrtl_if_stmt                      PARAMS ((tree));
 792 extern void genrtl_while_stmt                   PARAMS ((tree));
 793 extern void genrtl_do_stmt                      PARAMS ((tree));
 794 extern void genrtl_return_stmt                  PARAMS ((tree));
 795 extern void genrtl_for_stmt                     PARAMS ((tree));
 796 extern void genrtl_break_stmt                   PARAMS ((void));
 797 extern void genrtl_continue_stmt                PARAMS ((void));
 798 extern void genrtl_scope_stmt                   PARAMS ((tree));
 799 extern void genrtl_switch_stmt                  PARAMS ((tree));
 800 extern void genrtl_case_label                   PARAMS ((tree));
 801 extern void genrtl_compound_stmt                PARAMS ((tree));
 802 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
 803                                                          tree, tree,
 804                                                          tree, int));
 805 extern void genrtl_decl_cleanup                 PARAMS ((tree));
 806 extern int stmts_are_full_exprs_p               PARAMS ((void));
 807 extern int anon_aggr_type_p                     PARAMS ((tree));
 808
 809 /* For a VAR_DECL that is an anonymous union, these are the various
 810    sub-variables that make up the anonymous union.  */
 811 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 812
 813 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 814 #define DECL_C_BIT_FIELD(NODE) \
 815   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 816 #define SET_DECL_C_BIT_FIELD(NODE) \
 817   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 818 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 819   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 820
 821 /* In a VAR_DECL, nonzero if the decl is a register variable with
 822    an explicit asm specification.  */
 823 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
 824
 825 extern void emit_local_var                      PARAMS ((tree));
 826 extern void make_rtl_for_local_static           PARAMS ((tree));
 827 extern tree expand_cond                         PARAMS ((tree));
 828 extern tree c_expand_return                     PARAMS ((tree));
 829 extern tree do_case                             PARAMS ((tree, tree));
 830 extern tree build_stmt                          PARAMS ((enum tree_code, ...));
 831 extern tree build_case_label                    PARAMS ((tree, tree, tree));
 832 extern tree build_continue_stmt                 PARAMS ((void));
 833 extern tree build_break_stmt                    PARAMS ((void));
 834 extern tree build_return_stmt                   PARAMS ((tree));
 835
 836 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
 837
 838 /* Used by the C++ frontend to mark the block around the member
 839    initializers and cleanups.  */
 840 #define COMPOUND_STMT_BODY_BLOCK(NODE)  TREE_LANG_FLAG_3 (NODE)
 841
 842 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
 843
 844 /* These functions must be defined by each front-end which implements
 845    a variant of the C language.  They are used in c-common.c.  */
 846
 847 extern tree build_unary_op                      PARAMS ((enum tree_code,
 848                                                          tree, int));
 849 extern tree build_binary_op                     PARAMS ((enum tree_code,
 850                                                          tree, tree, int));
 851 extern int lvalue_p                             PARAMS ((tree));
 852 extern tree default_conversion                  PARAMS ((tree));
 853
 854 /* Given two integer or real types, return the type for their sum.
 855    Given two compatible ANSI C types, returns the merged type.  */
 856
 857 extern tree common_type                         PARAMS ((tree, tree));
 858
 859 extern tree expand_tree_builtin                 PARAMS ((tree, tree, tree));
 860
 861 extern tree decl_constant_value         PARAMS ((tree));
 862
 863 /* Handle increment and decrement of boolean types.  */
 864 extern tree boolean_increment                   PARAMS ((enum tree_code,
 865                                                          tree));
 866
 867 /* Hook currently used only by the C++ front end to reset internal state
 868    after entering or leaving a header file.  */
 869 extern void extract_interface_info              PARAMS ((void));
 870
 871 extern int case_compare                         PARAMS ((splay_tree_key,
 872                                                          splay_tree_key));
 873
 874 extern tree c_add_case_label                    PARAMS ((splay_tree,
 875                                                          tree, tree,
 876                                                          tree));
 877
 878 extern tree build_function_call                 PARAMS ((tree, tree));
 879
 880 extern tree finish_label_address_expr           PARAMS ((tree));
 881
 882 /* Same function prototype, but the C and C++ front ends have
 883    different implementations.  Used in c-common.c.  */
 884 extern tree lookup_label                        PARAMS ((tree));
 885
 886 extern rtx c_expand_expr                        PARAMS ((tree, rtx,
 887                                                          enum machine_mode,
 888                                                          int));
 889
 890 extern int c_safe_from_p                        PARAMS ((rtx, tree));
 891
 892 extern int c_staticp                            PARAMS ((tree));
 893
 894 extern int c_common_unsafe_for_reeval           PARAMS ((tree));
 895
 896 extern const char *init_c_lex                   PARAMS ((const char *));
 897
 898 /* Information recorded about each file examined during compilation.  */
 899
 900 struct c_fileinfo
 901 {
 902   int time;     /* Time spent in the file.  */
 903   short interface_only;         /* Flags - used only by C++ */
 904   short interface_unknown;
 905 };
 906
 907 struct c_fileinfo *get_fileinfo                 PARAMS ((const char *));
 908 extern void dump_time_statistics                PARAMS ((void));
 909
 910 extern int c_dump_tree                          PARAMS ((void *, tree));
 911
 912 #endif /* ! GCC_C_COMMON_H */