gcc/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 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       RETURN_NULLIFIED_P (in RETURN_STMT)
  36       ASM_INPUT_P (in ASM_STMT)
  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    4: SCOPE_PARTIAL_P (in SCOPE_STMT)
  42 */
  43
  44 /* Reserved identifiers.  This is the union of all the keywords for C,
  45    C++, and Objective C.  All the type modifiers have to be in one
  46    block at the beginning, because they are used as mask bits.  There
  47    are 27 type modifiers; if we add many more we will have to redesign
  48    the mask mechanism.  */
  49
  50 enum rid
  51 {
  52   /* Modifiers: */
  53   /* C, in empirical order of frequency. */
  54   RID_STATIC = 0,
  55   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  56   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  57   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  58
  59   /* C extensions */
  60   RID_BOUNDED, RID_UNBOUNDED, RID_COMPLEX,
  61
  62   /* C++ */
  63   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  64
  65   /* ObjC */
  66   RID_FIRST_PQ, RID_IN = RID_FIRST_PQ, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  67
  68   /* C */
  69   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  70   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  71   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  72   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  73   RID_SIZEOF,
  74
  75   /* C extensions */
  76   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  77   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_PTRBASE,
  78   RID_PTREXTENT, RID_PTRVALUE,
  79
  80   /* Too many ways of getting the name of a function as a string */
  81   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  82
  83   /* C++ */
  84   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  85   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  86   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  87   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  88   RID_NEW,      RID_OPERATOR, RID_THIS,
  89   RID_THROW,    RID_TRUE,     RID_TRY,
  90   RID_TYPENAME, RID_TYPEID,   RID_USING,
  91
  92   /* casts */
  93   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  94
  95   /* alternate spellings */
  96   RID_AND, RID_AND_EQ, RID_NOT, RID_NOT_EQ,
  97   RID_OR,  RID_OR_EQ,  RID_XOR, RID_XOR_EQ,
  98   RID_BITAND, RID_BITOR, RID_COMPL,
  99
 100   /* Objective C */
 101   RID_ID,          RID_AT_ENCODE,    RID_AT_END,
 102   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 103   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 104   RID_AT_PROTOCOL, RID_AT_SELECTOR,  RID_AT_INTERFACE,
 105   RID_AT_IMPLEMENTATION,
 106
 107   RID_MAX,
 108
 109   RID_FIRST_MODIFIER = RID_STATIC,
 110   RID_LAST_MODIFIER = RID_ONEWAY
 111 };
 112
 113 /* The elements of `ridpointers' are identifier nodes for the reserved
 114    type names and storage classes.  It is indexed by a RID_... value.  */
 115 extern tree *ridpointers;
 116
 117 /* Standard named or nameless data types of the C compiler.  */
 118
 119 enum c_tree_index
 120 {
 121     CTI_WCHAR_TYPE,
 122     CTI_SIGNED_WCHAR_TYPE,
 123     CTI_UNSIGNED_WCHAR_TYPE,
 124     CTI_WINT_TYPE,
 125     CTI_C_SIZE_TYPE, /* The type used for the size_t typedef and the
 126                         result type of sizeof (an ordinary type without
 127                         TYPE_IS_SIZETYPE set, unlike the internal
 128                         sizetype).  */
 129     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 130     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 131     CTI_INTMAX_TYPE,
 132     CTI_UINTMAX_TYPE,
 133     CTI_WIDEST_INT_LIT_TYPE,
 134     CTI_WIDEST_UINT_LIT_TYPE,
 135
 136     CTI_CHAR_ARRAY_TYPE,
 137     CTI_WCHAR_ARRAY_TYPE,
 138     CTI_INT_ARRAY_TYPE,
 139     CTI_STRING_TYPE,
 140     CTI_CONST_STRING_TYPE,
 141
 142     /* Type for boolean expressions (bool in C++, int in C).  */
 143     CTI_BOOLEAN_TYPE,
 144     CTI_BOOLEAN_TRUE,
 145     CTI_BOOLEAN_FALSE,
 146     /* C99's _Bool type.  */
 147     CTI_C_BOOL_TYPE,
 148     CTI_C_BOOL_TRUE,
 149     CTI_C_BOOL_FALSE,
 150     CTI_DEFAULT_FUNCTION_TYPE,
 151
 152     CTI_G77_INTEGER_TYPE,
 153     CTI_G77_UINTEGER_TYPE,
 154     CTI_G77_LONGINT_TYPE,
 155     CTI_G77_ULONGINT_TYPE,
 156
 157     /* These are not types, but we have to look them up all the time. */
 158     CTI_FUNCTION_NAME_DECL,
 159     CTI_PRETTY_FUNCTION_NAME_DECL,
 160     CTI_C99_FUNCTION_NAME_DECL,
 161     CTI_SAVED_FUNCTION_NAME_DECLS,
 162
 163     CTI_VOID_ZERO,
 164
 165     CTI_MAX
 166 };
 167
 168 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->rid_code)
 169
 170 /* Identifier part common to the C front ends.  Inherits from
 171    tree_identifier, despite appearances.  */
 172 struct c_common_identifier
 173 {
 174   struct tree_common common;
 175   struct cpp_hashnode node;
 176   ENUM_BITFIELD(rid) rid_code: CHAR_BIT;
 177 };
 178
 179 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 180 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 181 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 182 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 183 #define c_size_type_node                c_global_trees[CTI_C_SIZE_TYPE]
 184 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 185 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 186 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 187 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 188 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 189 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 190
 191 #define boolean_type_node               c_global_trees[CTI_BOOLEAN_TYPE]
 192 #define boolean_true_node               c_global_trees[CTI_BOOLEAN_TRUE]
 193 #define boolean_false_node              c_global_trees[CTI_BOOLEAN_FALSE]
 194
 195 #define c_bool_type_node                c_global_trees[CTI_C_BOOL_TYPE]
 196 #define c_bool_true_node                c_global_trees[CTI_C_BOOL_TRUE]
 197 #define c_bool_false_node               c_global_trees[CTI_C_BOOL_FALSE]
 198
 199 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 200 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 201 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 202 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 203 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 204
 205 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 206
 207 /* g77 integer types, which which must be kept in sync with f/com.h */
 208 #define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
 209 #define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
 210 #define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
 211 #define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
 212
 213 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 214 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 215 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 216 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 217
 218 /* A node for `((void) 0)'.  */
 219 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 220
 221 extern tree c_global_trees[CTI_MAX];
 222
 223 /* Mark which labels are explicitly declared.
 224    These may be shadowed, and may be referenced from nested functions.  */
 225 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 226
 227 typedef enum c_language_kind
 228 {
 229   clk_c,           /* A dialect of C: K&R C, ANSI/ISO C89, C2000,
 230                        etc. */
 231   clk_cplusplus,   /* ANSI/ISO C++ */
 232   clk_objective_c  /* Objective C */
 233 }
 234 c_language_kind;
 235
 236 /* Information about a statement tree.  */
 237
 238 struct stmt_tree_s {
 239   /* The last statement added to the tree.  */
 240   tree x_last_stmt;
 241   /* The type of the last expression statement.  (This information is
 242      needed to implement the statement-expression extension.)  */
 243   tree x_last_expr_type;
 244   /* In C++, Non-zero if we should treat statements as full
 245      expressions.  In particular, this variable is no-zero if at the
 246      end of a statement we should destroy any temporaries created
 247      during that statement.  Similarly, if, at the end of a block, we
 248      should destroy any local variables in this block.  Normally, this
 249      variable is non-zero, since those are the normal semantics of
 250      C++.
 251
 252      However, in order to represent aggregate initialization code as
 253      tree structure, we use statement-expressions.  The statements
 254      within the statement expression should not result in cleanups
 255      being run until the entire enclosing statement is complete.
 256
 257      This flag has no effect in C.  */
 258   int stmts_are_full_exprs_p;
 259 };
 260
 261 typedef struct stmt_tree_s *stmt_tree;
 262
 263 /* Global state pertinent to the current function.  Some C dialects
 264    extend this structure with additional fields.  */
 265
 266 struct language_function {
 267   /* While we are parsing the function, this contains information
 268      about the statement-tree that we are building.  */
 269   struct stmt_tree_s x_stmt_tree;
 270   /* The stack of SCOPE_STMTs for the current function.  */
 271   tree x_scope_stmt_stack;
 272 };
 273
 274 /* When building a statement-tree, this is the last statement added to
 275    the tree.  */
 276
 277 #define last_tree (current_stmt_tree ()->x_last_stmt)
 278
 279 /* The type of the last expression-statement we have seen.  */
 280
 281 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 282
 283 /* LAST_TREE contains the last statement parsed.  These are chained
 284    together through the TREE_CHAIN field, but often need to be
 285    re-organized since the parse is performed bottom-up.  This macro
 286    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 287
 288 #define RECHAIN_STMTS(stmt, substmt)            \
 289   do {                                          \
 290     substmt = TREE_CHAIN (stmt);                \
 291     TREE_CHAIN (stmt) = NULL_TREE;              \
 292     last_tree = stmt;                           \
 293   } while (0)
 294
 295 /* Language-specific hooks.  */
 296
 297 extern int (*lang_statement_code_p)             PARAMS ((enum tree_code));
 298 extern void (*lang_expand_stmt)                 PARAMS ((tree));
 299 extern void (*lang_expand_decl_stmt)            PARAMS ((tree));
 300 extern void (*lang_expand_function_end)         PARAMS ((void));
 301
 302 /* Callback that determines if it's ok for a function to have no
 303    noreturn attribute.  */
 304 extern int (*lang_missing_noreturn_ok_p)        PARAMS ((tree));
 305
 306
 307 /* The type of a function that walks over tree structure.  */
 308
 309 typedef tree (*walk_tree_fn)                    PARAMS ((tree *,
 310                                                          int *,
 311                                                          void *));
 312
 313 extern stmt_tree current_stmt_tree              PARAMS ((void));
 314 extern tree *current_scope_stmt_stack           PARAMS ((void));
 315 extern void begin_stmt_tree                     PARAMS ((tree *));
 316 extern tree add_stmt                            PARAMS ((tree));
 317 extern void add_decl_stmt                       PARAMS ((tree));
 318 extern tree add_scope_stmt                      PARAMS ((int, int));
 319 extern void finish_stmt_tree                    PARAMS ((tree *));
 320
 321 extern int statement_code_p                     PARAMS ((enum tree_code));
 322 extern tree walk_stmt_tree                      PARAMS ((tree *,
 323                                                          walk_tree_fn,
 324                                                          void *));
 325 extern void prep_stmt                           PARAMS ((tree));
 326 extern void expand_stmt                         PARAMS ((tree));
 327 extern void mark_stmt_tree                      PARAMS ((void *));
 328
 329 /* Extra information associated with a DECL.  Other C dialects extend
 330    this structure in various ways.  The C front-end only uses this
 331    structure for FUNCTION_DECLs; all other DECLs have a NULL
 332    DECL_LANG_SPECIFIC field.  */
 333
 334 struct c_lang_decl {
 335   /* In a FUNCTION_DECL, this is DECL_SAVED_TREE.  */
 336   tree saved_tree;
 337 };
 338
 339 /* In a FUNCTION_DECL, the saved representation of the body of the
 340    entire function.  Usually a COMPOUND_STMT, but in C++ this may also
 341    be a RETURN_INIT, CTOR_INITIALIZER, or TRY_BLOCK.  */
 342 #define DECL_SAVED_TREE(NODE)                                               \
 343   (((struct c_lang_decl *) DECL_LANG_SPECIFIC (FUNCTION_DECL_CHECK (NODE))) \
 344    ->saved_tree)
 345
 346 /* In a FUNCTION_DECL for which DECL_BUILT_IN does not hold, this is
 347      the approximate number of statements in this function.  There is
 348      no need for this number to be exact; it is only used in various
 349      heuristics regarding optimization.  */
 350 #define DECL_NUM_STMTS(NODE) \
 351   (FUNCTION_DECL_CHECK (NODE)->decl.u1.i)
 352
 353 extern void c_mark_lang_decl                    PARAMS ((struct c_lang_decl *));
 354
 355 /* The variant of the C language being processed.  Each C language
 356    front-end defines this variable.  */
 357
 358 extern c_language_kind c_language;
 359
 360 /* Nonzero means give string constants the type `const char *', rather
 361    than `char *'.  */
 362
 363 extern int flag_const_strings;
 364
 365 /* Nonzero means give `double' the same size as `float'.  */
 366
 367 extern int flag_short_double;
 368
 369 /* Nonzero means give `wchar_t' the same size as `short'.  */
 370
 371 extern int flag_short_wchar;
 372
 373 /* Warn about *printf or *scanf format/argument anomalies. */
 374
 375 extern int warn_format;
 376
 377 /* Warn about Y2K problems with strftime formats.  */
 378
 379 extern int warn_format_y2k;
 380
 381 /* Warn about excess arguments to formats.  */
 382
 383 extern int warn_format_extra_args;
 384
 385 /* Warn about non-literal format arguments.  */
 386
 387 extern int warn_format_nonliteral;
 388
 389 /* Warn about possible security problems with calls to format functions.  */
 390
 391 extern int warn_format_security;
 392
 393 /* Warn about possible violations of sequence point rules.  */
 394
 395 extern int warn_sequence_point;
 396
 397 /* Warn about functions which might be candidates for format attributes.  */
 398
 399 extern int warn_missing_format_attribute;
 400
 401 /* Nonzero means do some things the same way PCC does.  */
 402
 403 extern int flag_traditional;
 404
 405 /* Nonzero means enable C89 Amendment 1 features.  */
 406
 407 extern int flag_isoc94;
 408
 409 /* Nonzero means use the ISO C99 dialect of C.  */
 410
 411 extern int flag_isoc99;
 412
 413 /* Nonzero means environment is hosted (i.e., not freestanding) */
 414
 415 extern int flag_hosted;
 416
 417 /* Nonzero means add default format_arg attributes for functions not
 418    in ISO C.  */
 419
 420 extern int flag_noniso_default_format_attributes;
 421
 422 /* Nonzero means don't recognize any builtin functions.  */
 423
 424 extern int flag_no_builtin;
 425
 426 /* Nonzero means don't recognize the non-ANSI builtin functions.
 427    -ansi sets this.  */
 428
 429 extern int flag_no_nonansi_builtin;
 430
 431 /* Nonzero means warn about suggesting putting in ()'s.  */
 432
 433 extern int warn_parentheses;
 434
 435 /* Warn if a type conversion is done that might have confusing results.  */
 436
 437 extern int warn_conversion;
 438
 439 /* Nonzero means warn about usage of long long,
 440    when `-pedantic' and not C99.  */
 441
 442 extern int warn_long_long;
 443
 444 /* C types are partitioned into three subsets: object, function, and
 445    incomplete types.  */
 446 #define C_TYPE_OBJECT_P(type) \
 447   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 448
 449 #define C_TYPE_INCOMPLETE_P(type) \
 450   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 451
 452 #define C_TYPE_FUNCTION_P(type) \
 453   (TREE_CODE (type) == FUNCTION_TYPE)
 454
 455 /* Return the qualifiers that apply to this type.  In C++, that means
 456    descending through array types.  Note that this macro evaluates its
 457    arguments mor than once.  */
 458 #define C_TYPE_QUALS(TYPE)                              \
 459   (TYPE_QUALS ((TREE_CODE (TYPE) == ARRAY_TYPE          \
 460                 && c_language == clk_cplusplus)         \
 461                ? strip_array_types (TYPE) : TYPE))
 462
 463 /* For convenience we define a single macro to identify the class of
 464    object or incomplete types.  */
 465 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 466   (!C_TYPE_FUNCTION_P (type))
 467
 468 /* Record in each node resulting from a binary operator
 469    what operator was specified for it.  */
 470 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 471
 472 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 473    ID is the identifier to use, NAME is the string.
 474    TYPE_DEP indicates whether it depends on type of the function or not
 475    (i.e. __PRETTY_FUNCTION__).  */
 476
 477 extern tree (*make_fname_decl)                  PARAMS ((tree, int));
 478
 479 extern tree identifier_global_value             PARAMS ((tree));
 480 extern void record_builtin_type                 PARAMS ((enum rid,
 481                                                          const char *, tree));
 482 extern tree build_void_list_node                PARAMS ((void));
 483 extern void start_fname_decls                   PARAMS ((void));
 484 extern void finish_fname_decls                  PARAMS ((void));
 485 extern const char *fname_as_string              PARAMS ((int));
 486 extern tree fname_decl                          PARAMS ((unsigned, tree));
 487 extern const char *fname_string                 PARAMS ((unsigned));
 488 extern void decl_attributes                     PARAMS ((tree, tree, tree));
 489 extern void init_function_format_info           PARAMS ((void));
 490 extern void check_function_format               PARAMS ((int *, tree, tree, tree));
 491 extern void set_Wformat                         PARAMS ((int));
 492 extern void decl_handle_format_attribute        PARAMS ((tree, tree));
 493 extern void decl_handle_format_arg_attribute    PARAMS ((tree, tree));
 494 extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
 495 /* Print an error message for invalid operands to arith operation CODE.
 496    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 497 extern void binary_op_error                     PARAMS ((enum tree_code));
 498 extern tree c_expand_expr_stmt                  PARAMS ((tree));
 499 extern void c_expand_start_cond                 PARAMS ((tree, int));
 500 extern void c_finish_then                       PARAMS ((void));
 501 extern void c_expand_start_else                 PARAMS ((void));
 502 extern void c_finish_else                   PARAMS ((void));
 503 extern void c_expand_end_cond                   PARAMS ((void));
 504 /* Validate the expression after `case' and apply default promotions.  */
 505 extern tree check_case_value                    PARAMS ((tree));
 506 /* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
 507 extern tree combine_strings                     PARAMS ((tree));
 508 extern void constant_expression_warning         PARAMS ((tree));
 509 extern tree convert_and_check                   PARAMS ((tree, tree));
 510 extern void overflow_warning                    PARAMS ((tree));
 511 extern void unsigned_conversion_warning         PARAMS ((tree, tree));
 512
 513 /* Read the rest of the current #-directive line.  */
 514 extern char *get_directive_line                 PARAMS ((void));
 515 #define GET_DIRECTIVE_LINE() get_directive_line ()
 516
 517 /* Subroutine of build_binary_op, used for comparison operations.
 518    See if the operands have both been converted from subword integer types
 519    and, if so, perhaps change them both back to their original type.  */
 520 extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
 521
 522 extern unsigned int min_precision               PARAMS ((tree, int));
 523
 524 /* Add qualifiers to a type, in the fashion for C.  */
 525 extern tree c_build_qualified_type              PARAMS ((tree, int));
 526
 527 /* Build tree nodes and builtin functions common to both C and C++ language
 528    frontends.  */
 529 extern void c_common_nodes_and_builtins         PARAMS ((void));
 530
 531 extern tree build_va_arg                        PARAMS ((tree, tree));
 532
 533 extern void c_common_lang_init                  PARAMS ((void));
 534
 535 extern bool c_promoting_integer_type_p          PARAMS ((tree));
 536 extern int self_promoting_args_p                PARAMS ((tree));
 537 extern tree simple_type_promotes_to             PARAMS ((tree));
 538 extern tree strip_array_types                   PARAMS ((tree));
 539
 540 /* These macros provide convenient access to the various _STMT nodes.  */
 541
 542 /* Nonzero if this statement should be considered a full-expression,
 543    i.e., if temporaries created during this statement should have
 544    their destructors run at the end of this statement.  (In C, this
 545    will always be false, since there are no destructors.)  */
 546 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 547
 548 /* IF_STMT accessors. These give access to the condtion of the if
 549    statement, the then block of the if statement, and the else block
 550    of the if stsatement if it exists. */
 551 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 552 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 553 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 554
 555 /* WHILE_STMT accessors. These give access to the condtion of the
 556    while statement and the body of the while statement, respectively. */
 557 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 558 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 559
 560 /* DO_STMT accessors. These give access to the condition of the do
 561    statement and the body of the do statement, respectively. */
 562 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 563 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 564
 565 /* RETURN_STMT accessors. These give the expression associated with a
 566    return statement, and whether it should be ignored when expanding
 567    (as opposed to inlining).  */
 568 #define RETURN_EXPR(NODE)       TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 569 #define RETURN_NULLIFIED_P(NODE) TREE_LANG_FLAG_0 (RETURN_STMT_CHECK (NODE))
 570
 571 /* EXPR_STMT accessor. This gives the expression associated with an
 572    expression statement. */
 573 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 574
 575 /* FOR_STMT accessors. These give access to the init statement,
 576    condition, update expression, and body of the for statement,
 577    respectively. */
 578 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 579 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 580 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 581 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 582
 583 /* SWITCH_STMT accessors. These give access to the condition and body
 584    of the switch statement, respectively. */
 585 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
 586 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
 587
 588 /* CASE_LABEL accessors. These give access to the high and low values
 589    of a case label, respectively. */
 590 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
 591 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
 592 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
 593
 594 /* GOTO_STMT accessor. This gives access to the label associated with
 595    a goto statement. */
 596 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
 597
 598 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
 599    statements assocated with a compound statement. The result is the
 600    first statement in the list. Succeeding nodes can be acccessed by
 601    calling TREE_CHAIN on a node in the list. */
 602 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
 603
 604 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
 605    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
 606    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
 607    statement. */
 608 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
 609 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
 610 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
 611 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
 612 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
 613
 614 /* DECL_STMT accessor. This gives access to the DECL associated with
 615    the given declaration statement. */
 616 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
 617
 618 /* STMT_EXPR accessor. */
 619 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 620
 621 /* LABEL_STMT accessor. This gives access to the label associated with
 622    the given label statement. */
 623 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
 624
 625 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
 626 #define SCOPE_BEGIN_P(NODE) \
 627   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
 628
 629 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
 630 #define SCOPE_END_P(NODE) \
 631   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
 632
 633 /* The BLOCK containing the declarations contained in this scope.  */
 634 #define SCOPE_STMT_BLOCK(NODE) \
 635   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
 636
 637 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
 638 #define SCOPE_NULLIFIED_P(NODE) \
 639   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
 640
 641 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
 642    which should be treated as non-existant from the point of view of
 643    running cleanup actions.  */
 644 #define SCOPE_NO_CLEANUPS_P(NODE) \
 645   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
 646
 647 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
 648    For example, in:
 649
 650      S s;
 651      l:
 652      S s2;
 653      goto l;
 654
 655    there is (implicitly) a new scope after `l', even though there are
 656    no curly braces.  In particular, when we hit the goto, we must
 657    destroy s2 and then re-construct it.  For the implicit scope,
 658    SCOPE_PARTIAL_P will be set.  */
 659 #define SCOPE_PARTIAL_P(NODE) \
 660   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
 661
 662 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
 663 #define ASM_VOLATILE_P(NODE)                    \
 664   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
 665
 666 /* The line-number at which a statement began.  But if
 667    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
 668    line number for the end of the current function instead.  */
 669 #define STMT_LINENO(NODE)                       \
 670   (TREE_COMPLEXITY ((NODE)))
 671
 672 /* If non-zero, the STMT_LINENO for NODE is the line at which the
 673    function ended.  */
 674 #define STMT_LINENO_FOR_FN_P(NODE)              \
 675   (TREE_LANG_FLAG_2 ((NODE)))
 676
 677 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 678    initialization variables. */
 679 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 680
 681 /* Nonzero if we want to create an ASM_INPUT instead of an
 682    ASM_OPERAND with no operands.  */
 683 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 684
 685 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 686
 687 enum c_tree_code {
 688   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 689 #include "c-common.def"
 690   LAST_C_TREE_CODE
 691 };
 692
 693 #undef DEFTREECODE
 694
 695 extern void add_c_tree_codes                    PARAMS ((void));
 696 extern void genrtl_do_pushlevel                 PARAMS ((void));
 697 extern void genrtl_goto_stmt                    PARAMS ((tree));
 698 extern void genrtl_expr_stmt                    PARAMS ((tree));
 699 extern void genrtl_decl_stmt                    PARAMS ((tree));
 700 extern void genrtl_if_stmt                      PARAMS ((tree));
 701 extern void genrtl_while_stmt                   PARAMS ((tree));
 702 extern void genrtl_do_stmt                      PARAMS ((tree));
 703 extern void genrtl_return_stmt                  PARAMS ((tree));
 704 extern void genrtl_for_stmt                     PARAMS ((tree));
 705 extern void genrtl_break_stmt                   PARAMS ((void));
 706 extern void genrtl_continue_stmt                PARAMS ((void));
 707 extern void genrtl_scope_stmt                   PARAMS ((tree));
 708 extern void genrtl_switch_stmt                  PARAMS ((tree));
 709 extern void genrtl_case_label                   PARAMS ((tree));
 710 extern void genrtl_compound_stmt                PARAMS ((tree));
 711 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
 712                                                          tree, tree,
 713                                                          tree, int));
 714 extern void genrtl_decl_cleanup                 PARAMS ((tree, tree));
 715 extern int stmts_are_full_exprs_p               PARAMS ((void));
 716 extern int anon_aggr_type_p                     PARAMS ((tree));
 717
 718 /* For a VAR_DECL that is an anonymous union, these are the various
 719    sub-variables that make up the anonymous union.  */
 720 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 721
 722 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 723 #define DECL_C_BIT_FIELD(NODE) \
 724   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 725 #define SET_DECL_C_BIT_FIELD(NODE) \
 726   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 727 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 728   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 729
 730 /* In a VAR_DECL, nonzero if the decl is a register variable with
 731    an explicit asm specification.  */
 732 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
 733
 734 extern void emit_local_var                      PARAMS ((tree));
 735 extern void make_rtl_for_local_static           PARAMS ((tree));
 736 extern tree expand_cond                         PARAMS ((tree));
 737 extern tree c_expand_return                     PARAMS ((tree));
 738 extern tree do_case                             PARAMS ((tree, tree));
 739 extern tree build_stmt                          PARAMS ((enum tree_code, ...));
 740 extern tree build_case_label                    PARAMS ((tree, tree, tree));
 741 extern tree build_continue_stmt                 PARAMS ((void));
 742 extern tree build_break_stmt                    PARAMS ((void));
 743 extern tree build_return_stmt                   PARAMS ((tree));
 744
 745 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
 746
 747 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
 748
 749 /* These functions must be defined by each front-end which implements
 750    a variant of the C language.  They are used in c-common.c.  */
 751
 752 extern tree build_unary_op                      PARAMS ((enum tree_code,
 753                                                          tree, int));
 754 extern tree build_binary_op                     PARAMS ((enum tree_code,
 755                                                          tree, tree, int));
 756 extern int lvalue_p                             PARAMS ((tree));
 757 extern tree default_conversion                  PARAMS ((tree));
 758
 759 /* Given two integer or real types, return the type for their sum.
 760    Given two compatible ANSI C types, returns the merged type.  */
 761
 762 extern tree common_type                         PARAMS ((tree, tree));
 763
 764 extern tree expand_tree_builtin                 PARAMS ((tree, tree, tree));
 765
 766 extern tree decl_constant_value         PARAMS ((tree));
 767
 768 /* Handle increment and decrement of boolean types.  */
 769 extern tree boolean_increment                   PARAMS ((enum tree_code,
 770                                                          tree));
 771
 772 /* Hook currently used only by the C++ front end to reset internal state
 773    after entering or leaving a header file.  */
 774 extern void extract_interface_info              PARAMS ((void));
 775
 776 extern void mark_c_language_function            PARAMS ((struct language_function *));
 777
 778 extern int case_compare                         PARAMS ((splay_tree_key,
 779                                                          splay_tree_key));
 780
 781 extern tree c_add_case_label                    PARAMS ((splay_tree,
 782                                                          tree, tree,
 783                                                          tree));
 784
 785 extern tree build_function_call                 PARAMS ((tree, tree));
 786
 787 extern tree finish_label_address_expr           PARAMS ((tree));
 788
 789 /* Same function prototype, but the C and C++ front ends have
 790    different implementations.  Used in c-common.c.  */
 791 extern tree lookup_label                        PARAMS ((tree));
 792
 793 /* If this variable is defined to a non-NULL value, it will be called
 794    after the file has been completely parsed.  The argument will be
 795    the GLOBAL_NAMESPACE in C++, or the list of top-level declarations
 796    in C.  */
 797 extern void (*back_end_hook) PARAMS ((tree));
 798
 799 #ifdef RTX_CODE
 800
 801 extern struct rtx_def *c_expand_expr            PARAMS ((tree, rtx,
 802                                                          enum machine_mode,
 803                                                          enum expand_modifier));
 804
 805 extern int c_safe_from_p                        PARAMS ((rtx, tree));
 806 #endif
 807
 808 extern int c_unsafe_for_reeval                  PARAMS ((tree));
 809
 810 /* In dump.c */
 811
 812 /* Different tree dump places. */
 813 enum tree_dump_index
 814 {
 815   TDI_all,                      /* dump the whole translation unit */
 816   TDI_original,                 /* dump each function before optimizing it */
 817   TDI_optimized,                        /* dump each function after optimizing it */
 818   TDI_class,                    /* dump class heirarchy */
 819   TDI_end
 820 };
 821
 822 /* Bit masks to control tree dumping. */
 823 #define TDF_ADDRESS     (1 << 0)        /* dump node addresses */
 824 #define TDF_SLIM        (1 << 1)        /* don't go wild following links */
 825
 826 typedef struct dump_info *dump_info_p;
 827
 828 /* A callback function used dump language-specific parts of tree
 829    nodes.  Returns non-zero if it does not want the usual dumping of
 830    the second argument.  */
 831
 832 typedef int (*dump_tree_fn) PARAMS ((dump_info_p, tree));
 833
 834 extern dump_tree_fn lang_dump_tree;
 835
 836 extern int dump_flag                    PARAMS ((dump_info_p, int, tree));
 837 extern int dump_enabled_p               PARAMS ((enum tree_dump_index));
 838 extern FILE *dump_begin                 PARAMS ((enum tree_dump_index, int *));
 839 extern void dump_end                    PARAMS ((enum tree_dump_index, FILE *));
 840 extern void dump_node                   PARAMS ((tree, int, FILE *));
 841 extern int dump_switch_p                PARAMS ((const char *));
 842
 843 /* Information recorded about each file examined during compilation.  */
 844
 845 struct c_fileinfo
 846 {
 847   int time;     /* Time spent in the file.  */
 848   short interface_only;         /* Flags - used only by C++ */
 849   short interface_unknown;
 850 };
 851
 852 struct c_fileinfo *get_fileinfo                 PARAMS ((const char *));
 853 extern void dump_time_statistics                PARAMS ((void));
 854
 855 #endif /* ! GCC_C_COMMON_H */