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,
  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   /* alternate spellings */
  97   RID_AND, RID_AND_EQ, RID_NOT, RID_NOT_EQ,
  98   RID_OR,  RID_OR_EQ,  RID_XOR, RID_XOR_EQ,
  99   RID_BITAND, RID_BITOR, RID_COMPL,
 100
 101   /* Objective C */
 102   RID_ID,          RID_AT_ENCODE,    RID_AT_END,
 103   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 104   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 105   RID_AT_PROTOCOL, RID_AT_SELECTOR,  RID_AT_INTERFACE,
 106   RID_AT_IMPLEMENTATION,
 107
 108   RID_MAX,
 109
 110   RID_FIRST_MODIFIER = RID_STATIC,
 111   RID_LAST_MODIFIER = RID_ONEWAY,
 112
 113   RID_FIRST_AT = RID_AT_ENCODE,
 114   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 115   RID_FIRST_PQ = RID_IN,
 116   RID_LAST_PQ = RID_ONEWAY
 117 };
 118
 119 #define OBJC_IS_AT_KEYWORD(rid) \
 120   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 121    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 122
 123 #define OBJC_IS_PQ_KEYWORD(rid) \
 124   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 125    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 126
 127 /* The elements of `ridpointers' are identifier nodes for the reserved
 128    type names and storage classes.  It is indexed by a RID_... value.  */
 129 extern tree *ridpointers;
 130
 131 /* Standard named or nameless data types of the C compiler.  */
 132
 133 enum c_tree_index
 134 {
 135     CTI_WCHAR_TYPE,
 136     CTI_SIGNED_WCHAR_TYPE,
 137     CTI_UNSIGNED_WCHAR_TYPE,
 138     CTI_WINT_TYPE,
 139     CTI_C_SIZE_TYPE, /* The type used for the size_t typedef and the
 140                         result type of sizeof (an ordinary type without
 141                         TYPE_IS_SIZETYPE set, unlike the internal
 142                         sizetype).  */
 143     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 144     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 145     CTI_INTMAX_TYPE,
 146     CTI_UINTMAX_TYPE,
 147     CTI_WIDEST_INT_LIT_TYPE,
 148     CTI_WIDEST_UINT_LIT_TYPE,
 149
 150     CTI_CHAR_ARRAY_TYPE,
 151     CTI_WCHAR_ARRAY_TYPE,
 152     CTI_INT_ARRAY_TYPE,
 153     CTI_STRING_TYPE,
 154     CTI_CONST_STRING_TYPE,
 155
 156     /* Type for boolean expressions (bool in C++, int in C).  */
 157     CTI_BOOLEAN_TYPE,
 158     CTI_BOOLEAN_TRUE,
 159     CTI_BOOLEAN_FALSE,
 160     /* C99's _Bool type.  */
 161     CTI_C_BOOL_TYPE,
 162     CTI_C_BOOL_TRUE,
 163     CTI_C_BOOL_FALSE,
 164     CTI_DEFAULT_FUNCTION_TYPE,
 165
 166     CTI_G77_INTEGER_TYPE,
 167     CTI_G77_UINTEGER_TYPE,
 168     CTI_G77_LONGINT_TYPE,
 169     CTI_G77_ULONGINT_TYPE,
 170
 171     /* These are not types, but we have to look them up all the time.  */
 172     CTI_FUNCTION_NAME_DECL,
 173     CTI_PRETTY_FUNCTION_NAME_DECL,
 174     CTI_C99_FUNCTION_NAME_DECL,
 175     CTI_SAVED_FUNCTION_NAME_DECLS,
 176
 177     CTI_VOID_ZERO,
 178
 179     CTI_MAX
 180 };
 181
 182 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 183
 184 /* Identifier part common to the C front ends.  Inherits from
 185    tree_identifier, despite appearances.  */
 186 struct c_common_identifier
 187 {
 188   struct tree_common common;
 189   struct cpp_hashnode node;
 190 };
 191
 192 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 193 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 194 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 195 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 196 #define c_size_type_node                c_global_trees[CTI_C_SIZE_TYPE]
 197 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 198 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 199 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 200 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 201 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 202 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 203
 204 #define boolean_type_node               c_global_trees[CTI_BOOLEAN_TYPE]
 205 #define boolean_true_node               c_global_trees[CTI_BOOLEAN_TRUE]
 206 #define boolean_false_node              c_global_trees[CTI_BOOLEAN_FALSE]
 207
 208 #define c_bool_type_node                c_global_trees[CTI_C_BOOL_TYPE]
 209 #define c_bool_true_node                c_global_trees[CTI_C_BOOL_TRUE]
 210 #define c_bool_false_node               c_global_trees[CTI_C_BOOL_FALSE]
 211
 212 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 213 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 214 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 215 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 216 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 217
 218 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 219
 220 /* g77 integer types, which which must be kept in sync with f/com.h */
 221 #define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
 222 #define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
 223 #define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
 224 #define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
 225
 226 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 227 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 228 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 229 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 230
 231 /* A node for `((void) 0)'.  */
 232 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 233
 234 extern tree c_global_trees[CTI_MAX];
 235
 236 /* Mark which labels are explicitly declared.
 237    These may be shadowed, and may be referenced from nested functions.  */
 238 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 239
 240 /* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
 241    warning if they undergo concatenation.  */
 242 #define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
 243
 244 typedef enum c_language_kind
 245 {
 246   clk_c,           /* A dialect of C: K&R C, ANSI/ISO C89, C2000,
 247                        etc.  */
 248   clk_cplusplus,   /* ANSI/ISO C++ */
 249   clk_objective_c  /* Objective C */
 250 }
 251 c_language_kind;
 252
 253 /* Information about a statement tree.  */
 254
 255 struct stmt_tree_s {
 256   /* The last statement added to the tree.  */
 257   tree x_last_stmt;
 258   /* The type of the last expression statement.  (This information is
 259      needed to implement the statement-expression extension.)  */
 260   tree x_last_expr_type;
 261   /* The last filename we recorded.  */
 262   const char *x_last_expr_filename;
 263   /* In C++, Non-zero if we should treat statements as full
 264      expressions.  In particular, this variable is no-zero if at the
 265      end of a statement we should destroy any temporaries created
 266      during that statement.  Similarly, if, at the end of a block, we
 267      should destroy any local variables in this block.  Normally, this
 268      variable is non-zero, since those are the normal semantics of
 269      C++.
 270
 271      However, in order to represent aggregate initialization code as
 272      tree structure, we use statement-expressions.  The statements
 273      within the statement expression should not result in cleanups
 274      being run until the entire enclosing statement is complete.
 275
 276      This flag has no effect in C.  */
 277   int stmts_are_full_exprs_p;
 278 };
 279
 280 typedef struct stmt_tree_s *stmt_tree;
 281
 282 /* Global state pertinent to the current function.  Some C dialects
 283    extend this structure with additional fields.  */
 284
 285 struct language_function {
 286   /* While we are parsing the function, this contains information
 287      about the statement-tree that we are building.  */
 288   struct stmt_tree_s x_stmt_tree;
 289   /* The stack of SCOPE_STMTs for the current function.  */
 290   tree x_scope_stmt_stack;
 291 };
 292
 293 /* When building a statement-tree, this is the last statement added to
 294    the tree.  */
 295
 296 #define last_tree (current_stmt_tree ()->x_last_stmt)
 297
 298 /* The type of the last expression-statement we have seen.  */
 299
 300 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 301
 302 /* The name of the last file we have seen.  */
 303
 304 #define last_expr_filename (current_stmt_tree ()->x_last_expr_filename)
 305
 306 /* LAST_TREE contains the last statement parsed.  These are chained
 307    together through the TREE_CHAIN field, but often need to be
 308    re-organized since the parse is performed bottom-up.  This macro
 309    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 310
 311 #define RECHAIN_STMTS(stmt, substmt)            \
 312   do {                                          \
 313     substmt = TREE_CHAIN (stmt);                \
 314     TREE_CHAIN (stmt) = NULL_TREE;              \
 315     last_tree = stmt;                           \
 316   } while (0)
 317
 318 /* Language-specific hooks.  */
 319
 320 extern int (*lang_statement_code_p)             PARAMS ((enum tree_code));
 321 extern void (*lang_expand_stmt)                 PARAMS ((tree));
 322 extern void (*lang_expand_decl_stmt)            PARAMS ((tree));
 323 extern void (*lang_expand_function_end)         PARAMS ((void));
 324 extern tree gettags                             PARAMS ((void));
 325
 326 /* Callback that determines if it's ok for a function to have no
 327    noreturn attribute.  */
 328 extern int (*lang_missing_noreturn_ok_p)        PARAMS ((tree));
 329
 330 extern int yyparse                              PARAMS ((void));
 331 extern stmt_tree current_stmt_tree              PARAMS ((void));
 332 extern tree *current_scope_stmt_stack           PARAMS ((void));
 333 extern void begin_stmt_tree                     PARAMS ((tree *));
 334 extern tree add_stmt                            PARAMS ((tree));
 335 extern void add_decl_stmt                       PARAMS ((tree));
 336 extern tree add_scope_stmt                      PARAMS ((int, int));
 337 extern void finish_stmt_tree                    PARAMS ((tree *));
 338
 339 extern int statement_code_p                     PARAMS ((enum tree_code));
 340 extern tree walk_stmt_tree                      PARAMS ((tree *,
 341                                                          walk_tree_fn,
 342                                                          void *));
 343 extern void prep_stmt                           PARAMS ((tree));
 344 extern void expand_stmt                         PARAMS ((tree));
 345 extern void mark_stmt_tree                      PARAMS ((void *));
 346 extern void shadow_warning                      PARAMS ((const char *,
 347                                                          tree, tree));
 348 extern tree c_begin_if_stmt                     PARAMS ((void));
 349 extern tree c_begin_while_stmt                  PARAMS ((void));
 350 extern void c_finish_while_stmt_cond            PARAMS ((tree, tree));
 351
 352
 353 /* Extra information associated with a DECL.  Other C dialects extend
 354    this structure in various ways.  The C front-end only uses this
 355    structure for FUNCTION_DECLs; all other DECLs have a NULL
 356    DECL_LANG_SPECIFIC field.  */
 357
 358 struct c_lang_decl {
 359   unsigned declared_inline : 1;
 360 };
 361
 362 /* In a FUNCTION_DECL for which DECL_BUILT_IN does not hold, this is
 363      the approximate number of statements in this function.  There is
 364      no need for this number to be exact; it is only used in various
 365      heuristics regarding optimization.  */
 366 #define DECL_NUM_STMTS(NODE) \
 367   (FUNCTION_DECL_CHECK (NODE)->decl.u1.i)
 368
 369 extern void c_mark_lang_decl                    PARAMS ((struct c_lang_decl *));
 370
 371 /* The variant of the C language being processed.  Each C language
 372    front-end defines this variable.  */
 373
 374 extern c_language_kind c_language;
 375
 376 /* Nonzero if prepreprocessing only.  */
 377 extern int flag_preprocess_only;
 378
 379 /* Nonzero means give string constants the type `const char *', rather
 380    than `char *'.  */
 381
 382 extern int flag_const_strings;
 383
 384 /* Nonzero means give `double' the same size as `float'.  */
 385
 386 extern int flag_short_double;
 387
 388 /* Nonzero means give `wchar_t' the same size as `short'.  */
 389
 390 extern int flag_short_wchar;
 391
 392 /* Warn about *printf or *scanf format/argument anomalies.  */
 393
 394 extern int warn_format;
 395
 396 /* Warn about Y2K problems with strftime formats.  */
 397
 398 extern int warn_format_y2k;
 399
 400 /* Warn about excess arguments to formats.  */
 401
 402 extern int warn_format_extra_args;
 403
 404 /* Warn about non-literal format arguments.  */
 405
 406 extern int warn_format_nonliteral;
 407
 408 /* Warn about possible security problems with calls to format functions.  */
 409
 410 extern int warn_format_security;
 411
 412 /* Warn about possible violations of sequence point rules.  */
 413
 414 extern int warn_sequence_point;
 415
 416 /* Warn about functions which might be candidates for format attributes.  */
 417
 418 extern int warn_missing_format_attribute;
 419
 420 /* Nonzero means warn about sizeof (function) or addition/subtraction
 421    of function pointers.  */
 422
 423 extern int warn_pointer_arith;
 424
 425 /* Nonzero means to warn about compile-time division by zero.  */
 426 extern int warn_div_by_zero;
 427
 428 /* Nonzero means enable C89 Amendment 1 features.  */
 429
 430 extern int flag_isoc94;
 431
 432 /* Nonzero means use the ISO C99 dialect of C.  */
 433
 434 extern int flag_isoc99;
 435
 436 /* Nonzero means environment is hosted (i.e., not freestanding) */
 437
 438 extern int flag_hosted;
 439
 440 /* Nonzero means add default format_arg attributes for functions not
 441    in ISO C.  */
 442
 443 extern int flag_noniso_default_format_attributes;
 444
 445 /* Nonzero means don't recognize any builtin functions.  */
 446
 447 extern int flag_no_builtin;
 448
 449 /* Nonzero means don't recognize the non-ANSI builtin functions.
 450    -ansi sets this.  */
 451
 452 extern int flag_no_nonansi_builtin;
 453
 454 /* Nonzero means warn about suggesting putting in ()'s.  */
 455
 456 extern int warn_parentheses;
 457
 458 /* Warn if a type conversion is done that might have confusing results.  */
 459
 460 extern int warn_conversion;
 461
 462 /* Nonzero means warn about usage of long long,
 463    when `-pedantic' and not C99.  */
 464
 465 extern int warn_long_long;
 466
 467 /* C types are partitioned into three subsets: object, function, and
 468    incomplete types.  */
 469 #define C_TYPE_OBJECT_P(type) \
 470   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 471
 472 #define C_TYPE_INCOMPLETE_P(type) \
 473   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 474
 475 #define C_TYPE_FUNCTION_P(type) \
 476   (TREE_CODE (type) == FUNCTION_TYPE)
 477
 478 /* For convenience we define a single macro to identify the class of
 479    object or incomplete types.  */
 480 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 481   (!C_TYPE_FUNCTION_P (type))
 482
 483 /* Record in each node resulting from a binary operator
 484    what operator was specified for it.  */
 485 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 486
 487 /* Attribute table common to the C front ends.  */
 488 extern const struct attribute_spec c_common_attribute_table[];
 489 extern const struct attribute_spec c_common_format_attribute_table[];
 490
 491 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 492    ID is the identifier to use, NAME is the string.
 493    TYPE_DEP indicates whether it depends on type of the function or not
 494    (i.e. __PRETTY_FUNCTION__).  */
 495
 496 extern tree (*make_fname_decl)                  PARAMS ((tree, int));
 497
 498 extern tree identifier_global_value             PARAMS ((tree));
 499 extern void record_builtin_type                 PARAMS ((enum rid,
 500                                                          const char *, tree));
 501 extern tree build_void_list_node                PARAMS ((void));
 502 extern void start_fname_decls                   PARAMS ((void));
 503 extern void finish_fname_decls                  PARAMS ((void));
 504 extern const char *fname_as_string              PARAMS ((int));
 505 extern tree fname_decl                          PARAMS ((unsigned, tree));
 506 extern const char *fname_string                 PARAMS ((unsigned));
 507
 508 extern void check_function_format               PARAMS ((int *, tree, tree));
 509 extern void set_Wformat                         PARAMS ((int));
 510 extern tree handle_format_attribute             PARAMS ((tree *, tree, tree,
 511                                                          int, bool *));
 512 extern tree handle_format_arg_attribute         PARAMS ((tree *, tree, tree,
 513                                                          int, bool *));
 514 extern void c_common_insert_default_attributes  PARAMS ((tree));
 515 extern tree c_common_type_for_mode              PARAMS ((enum machine_mode,
 516                                                          int));
 517 extern tree c_common_type_for_size              PARAMS ((unsigned int, int));
 518 extern tree c_common_unsigned_type              PARAMS ((tree));
 519 extern tree c_common_signed_type                PARAMS ((tree));
 520 extern tree c_common_signed_or_unsigned_type    PARAMS ((int, tree));
 521 extern tree c_common_truthvalue_conversion      PARAMS ((tree));
 522 extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
 523 extern tree c_sizeof                            PARAMS ((tree));
 524 extern tree c_alignof                           PARAMS ((tree));
 525 extern tree c_alignof_expr                      PARAMS ((tree));
 526 /* Print an error message for invalid operands to arith operation CODE.
 527    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 528 extern void binary_op_error                     PARAMS ((enum tree_code));
 529 extern tree c_expand_expr_stmt                  PARAMS ((tree));
 530 extern void c_expand_start_cond                 PARAMS ((tree, int, tree));
 531 extern void c_finish_then                       PARAMS ((void));
 532 extern void c_expand_start_else                 PARAMS ((void));
 533 extern void c_finish_else                       PARAMS ((void));
 534 extern void c_expand_end_cond                   PARAMS ((void));
 535 /* Validate the expression after `case' and apply default promotions.  */
 536 extern tree check_case_value                    PARAMS ((tree));
 537 extern tree fix_string_type                     PARAMS ((tree));
 538 struct varray_head_tag;
 539 extern tree combine_strings             PARAMS ((struct varray_head_tag *));
 540 extern void constant_expression_warning         PARAMS ((tree));
 541 extern tree convert_and_check                   PARAMS ((tree, tree));
 542 extern void overflow_warning                    PARAMS ((tree));
 543 extern void unsigned_conversion_warning         PARAMS ((tree, tree));
 544
 545 /* Read the rest of the current #-directive line.  */
 546 extern char *get_directive_line                 PARAMS ((void));
 547 #define GET_DIRECTIVE_LINE() get_directive_line ()
 548
 549 /* Subroutine of build_binary_op, used for comparison operations.
 550    See if the operands have both been converted from subword integer types
 551    and, if so, perhaps change them both back to their original type.  */
 552 extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
 553
 554 extern tree pointer_int_sum                     PARAMS ((enum tree_code, tree, tree));
 555 extern unsigned int min_precision               PARAMS ((tree, int));
 556
 557 /* Add qualifiers to a type, in the fashion for C.  */
 558 extern tree c_build_qualified_type              PARAMS ((tree, int));
 559
 560 /* Build tree nodes and builtin functions common to both C and C++ language
 561    frontends.  */
 562 extern void c_common_nodes_and_builtins         PARAMS ((void));
 563
 564 extern void disable_builtin_function            PARAMS ((const char *));
 565
 566 extern tree build_va_arg                        PARAMS ((tree, tree));
 567
 568 extern void c_common_init_options               PARAMS ((enum c_language_kind));
 569 extern void c_common_post_options               PARAMS ((void));
 570 extern const char *c_common_init                PARAMS ((const char *));
 571 extern void c_common_finish                     PARAMS ((void));
 572 extern void c_common_parse_file                 PARAMS ((int));
 573 extern HOST_WIDE_INT c_common_get_alias_set     PARAMS ((tree));
 574 extern bool c_promoting_integer_type_p          PARAMS ((tree));
 575 extern int self_promoting_args_p                PARAMS ((tree));
 576 extern tree strip_array_types                   PARAMS ((tree));
 577
 578 /* These macros provide convenient access to the various _STMT nodes.  */
 579
 580 /* Nonzero if this statement should be considered a full-expression,
 581    i.e., if temporaries created during this statement should have
 582    their destructors run at the end of this statement.  (In C, this
 583    will always be false, since there are no destructors.)  */
 584 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 585
 586 /* IF_STMT accessors. These give access to the condition of the if
 587    statement, the then block of the if statement, and the else block
 588    of the if statement if it exists.  */
 589 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 590 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 591 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 592
 593 /* WHILE_STMT accessors. These give access to the condition of the
 594    while statement and the body of the while statement, respectively.  */
 595 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 596 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 597
 598 /* DO_STMT accessors. These give access to the condition of the do
 599    statement and the body of the do statement, respectively.  */
 600 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 601 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 602
 603 /* RETURN_STMT accessors. These give the expression associated with a
 604    return statement, and whether it should be ignored when expanding
 605    (as opposed to inlining).  */
 606 #define RETURN_EXPR(NODE)       TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 607
 608 /* EXPR_STMT accessor. This gives the expression associated with an
 609    expression statement.  */
 610 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 611
 612 /* FOR_STMT accessors. These give access to the init statement,
 613    condition, update expression, and body of the for statement,
 614    respectively.  */
 615 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 616 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 617 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 618 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 619
 620 /* SWITCH_STMT accessors. These give access to the condition, body and
 621    original condition type (before any compiler conversions)
 622    of the switch statement, respectively.  */
 623 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
 624 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
 625 #define SWITCH_TYPE(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 2)
 626
 627 /* CASE_LABEL accessors. These give access to the high and low values
 628    of a case label, respectively.  */
 629 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
 630 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
 631 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
 632
 633 /* GOTO_STMT accessor. This gives access to the label associated with
 634    a goto statement.  */
 635 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
 636 /* True for goto created artifically by the compiler.  */
 637 #define GOTO_FAKE_P(NODE)       (TREE_LANG_FLAG_0 (GOTO_STMT_CHECK (NODE)))
 638
 639 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
 640    statements associated with a compound statement. The result is the
 641    first statement in the list. Succeeding nodes can be accessed by
 642    calling TREE_CHAIN on a node in the list.  */
 643 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
 644
 645 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
 646    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
 647    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
 648    statement.  */
 649 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
 650 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
 651 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
 652 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
 653 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
 654
 655 /* DECL_STMT accessor. This gives access to the DECL associated with
 656    the given declaration statement.  */
 657 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
 658
 659 /* STMT_EXPR accessor.  */
 660 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 661
 662 /* Nonzero if this statement-expression does not have an associated scope.  */
 663 #define STMT_EXPR_NO_SCOPE(NODE) \
 664    TREE_LANG_FLAG_0 (STMT_EXPR_CHECK (NODE))
 665
 666 /* LABEL_STMT accessor. This gives access to the label associated with
 667    the given label statement.  */
 668 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
 669
 670 /* COMPOUND_LITERAL_EXPR accessors.  */
 671 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 672   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 673 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 674   DECL_STMT_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 675
 676 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
 677 #define SCOPE_BEGIN_P(NODE) \
 678   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
 679
 680 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
 681 #define SCOPE_END_P(NODE) \
 682   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
 683
 684 /* The BLOCK containing the declarations contained in this scope.  */
 685 #define SCOPE_STMT_BLOCK(NODE) \
 686   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
 687
 688 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
 689 #define SCOPE_NULLIFIED_P(NODE) \
 690   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
 691
 692 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
 693    which should be treated as non-existent from the point of view of
 694    running cleanup actions.  */
 695 #define SCOPE_NO_CLEANUPS_P(NODE) \
 696   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
 697
 698 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
 699    For example, in:
 700
 701      S s;
 702      l:
 703      S s2;
 704      goto l;
 705
 706    there is (implicitly) a new scope after `l', even though there are
 707    no curly braces.  In particular, when we hit the goto, we must
 708    destroy s2 and then re-construct it.  For the implicit scope,
 709    SCOPE_PARTIAL_P will be set.  */
 710 #define SCOPE_PARTIAL_P(NODE) \
 711   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
 712
 713 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
 714 #define ASM_VOLATILE_P(NODE)                    \
 715   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
 716
 717 /* The VAR_DECL to clean up in a CLEANUP_STMT.  */
 718 #define CLEANUP_DECL(NODE) \
 719   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 0)
 720 /* The cleanup to run in a CLEANUP_STMT.  */
 721 #define CLEANUP_EXPR(NODE) \
 722   TREE_OPERAND (CLEANUP_STMT_CHECK (NODE), 1)
 723
 724 /* The filename we are changing to as of this FILE_STMT.  */
 725 #define FILE_STMT_FILENAME_NODE(NODE) \
 726   (TREE_OPERAND (FILE_STMT_CHECK (NODE), 0))
 727 #define FILE_STMT_FILENAME(NODE) \
 728   (IDENTIFIER_POINTER (FILE_STMT_FILENAME_NODE (NODE)))
 729
 730 /* The line-number at which a statement began.  But if
 731    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
 732    line number for the end of the current function instead.  */
 733 #define STMT_LINENO(NODE)                       \
 734   (TREE_COMPLEXITY ((NODE)))
 735
 736 /* If non-zero, the STMT_LINENO for NODE is the line at which the
 737    function ended.  */
 738 #define STMT_LINENO_FOR_FN_P(NODE)              \
 739   (TREE_LANG_FLAG_2 ((NODE)))
 740
 741 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 742    initialization variables.  */
 743 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 744
 745 /* Nonzero if we want to create an ASM_INPUT instead of an
 746    ASM_OPERAND with no operands.  */
 747 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 748
 749 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 750
 751 enum c_tree_code {
 752   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 753 #include "c-common.def"
 754   LAST_C_TREE_CODE
 755 };
 756
 757 #undef DEFTREECODE
 758
 759 extern void genrtl_do_pushlevel                 PARAMS ((void));
 760 extern void genrtl_goto_stmt                    PARAMS ((tree));
 761 extern void genrtl_expr_stmt                    PARAMS ((tree));
 762 extern void genrtl_expr_stmt_value              PARAMS ((tree, int, int));
 763 extern void genrtl_decl_stmt                    PARAMS ((tree));
 764 extern void genrtl_if_stmt                      PARAMS ((tree));
 765 extern void genrtl_while_stmt                   PARAMS ((tree));
 766 extern void genrtl_do_stmt                      PARAMS ((tree));
 767 extern void genrtl_return_stmt                  PARAMS ((tree));
 768 extern void genrtl_for_stmt                     PARAMS ((tree));
 769 extern void genrtl_break_stmt                   PARAMS ((void));
 770 extern void genrtl_continue_stmt                PARAMS ((void));
 771 extern void genrtl_scope_stmt                   PARAMS ((tree));
 772 extern void genrtl_switch_stmt                  PARAMS ((tree));
 773 extern void genrtl_case_label                   PARAMS ((tree));
 774 extern void genrtl_compound_stmt                PARAMS ((tree));
 775 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
 776                                                          tree, tree,
 777                                                          tree, int));
 778 extern void genrtl_decl_cleanup                 PARAMS ((tree));
 779 extern int stmts_are_full_exprs_p               PARAMS ((void));
 780 extern int anon_aggr_type_p                     PARAMS ((tree));
 781
 782 /* For a VAR_DECL that is an anonymous union, these are the various
 783    sub-variables that make up the anonymous union.  */
 784 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 785
 786 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 787 #define DECL_C_BIT_FIELD(NODE) \
 788   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 789 #define SET_DECL_C_BIT_FIELD(NODE) \
 790   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 791 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 792   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 793
 794 /* In a VAR_DECL, nonzero if the decl is a register variable with
 795    an explicit asm specification.  */
 796 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
 797
 798 extern void emit_local_var                      PARAMS ((tree));
 799 extern void make_rtl_for_local_static           PARAMS ((tree));
 800 extern tree expand_cond                         PARAMS ((tree));
 801 extern tree c_expand_return                     PARAMS ((tree));
 802 extern tree do_case                             PARAMS ((tree, tree));
 803 extern tree build_stmt                          PARAMS ((enum tree_code, ...));
 804 extern tree build_case_label                    PARAMS ((tree, tree, tree));
 805 extern tree build_continue_stmt                 PARAMS ((void));
 806 extern tree build_break_stmt                    PARAMS ((void));
 807 extern tree build_return_stmt                   PARAMS ((tree));
 808
 809 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
 810
 811 /* Used by the C++ frontend to mark the block around the member
 812    initializers and cleanups.  */
 813 #define COMPOUND_STMT_BODY_BLOCK(NODE)  TREE_LANG_FLAG_3 (NODE)
 814
 815 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
 816
 817 /* These functions must be defined by each front-end which implements
 818    a variant of the C language.  They are used in c-common.c.  */
 819
 820 extern tree build_unary_op                      PARAMS ((enum tree_code,
 821                                                          tree, int));
 822 extern tree build_binary_op                     PARAMS ((enum tree_code,
 823                                                          tree, tree, int));
 824 extern int lvalue_p                             PARAMS ((tree));
 825 extern tree default_conversion                  PARAMS ((tree));
 826
 827 /* Given two integer or real types, return the type for their sum.
 828    Given two compatible ANSI C types, returns the merged type.  */
 829
 830 extern tree common_type                         PARAMS ((tree, tree));
 831
 832 extern tree expand_tree_builtin                 PARAMS ((tree, tree, tree));
 833
 834 extern tree decl_constant_value         PARAMS ((tree));
 835
 836 /* Handle increment and decrement of boolean types.  */
 837 extern tree boolean_increment                   PARAMS ((enum tree_code,
 838                                                          tree));
 839
 840 /* Hook currently used only by the C++ front end to reset internal state
 841    after entering or leaving a header file.  */
 842 extern void extract_interface_info              PARAMS ((void));
 843
 844 extern void mark_c_language_function            PARAMS ((struct language_function *));
 845
 846 extern int case_compare                         PARAMS ((splay_tree_key,
 847                                                          splay_tree_key));
 848
 849 extern tree c_add_case_label                    PARAMS ((splay_tree,
 850                                                          tree, tree,
 851                                                          tree));
 852
 853 extern tree build_function_call                 PARAMS ((tree, tree));
 854
 855 extern tree finish_label_address_expr           PARAMS ((tree));
 856
 857 /* Same function prototype, but the C and C++ front ends have
 858    different implementations.  Used in c-common.c.  */
 859 extern tree lookup_label                        PARAMS ((tree));
 860
 861 extern rtx c_expand_expr                        PARAMS ((tree, rtx,
 862                                                          enum machine_mode,
 863                                                          int));
 864
 865 extern int c_safe_from_p                        PARAMS ((rtx, tree));
 866
 867 extern int c_staticp                            PARAMS ((tree));
 868
 869 extern int c_common_unsafe_for_reeval           PARAMS ((tree));
 870
 871 /* Information recorded about each file examined during compilation.  */
 872
 873 struct c_fileinfo
 874 {
 875   int time;     /* Time spent in the file.  */
 876   short interface_only;         /* Flags - used only by C++ */
 877   short interface_unknown;
 878 };
 879
 880 struct c_fileinfo *get_fileinfo                 PARAMS ((const char *));
 881 extern void dump_time_statistics                PARAMS ((void));
 882
 883 #endif /* ! GCC_C_COMMON_H */