gcc/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000 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 /* Usage of TREE_LANG_FLAG_?:
  23    0: COMPOUND_STMT_NO_SCOPE (in COMPOUND_STMT).
  24       TREE_NEGATED_INT (in INTEGER_CST).
  25       IDENTIFIER_MARKED (used by search routines).
  26       SCOPE_BEGIN_P (in SCOPE_STMT)
  27       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  28       NEW_FOR_SCOPE_P (in FOR_STMT)
  29    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  30       STMT_IS_FULL_EXPR_P (in _STMT)
  31    2: STMT_LINENO_FOR_FN_P (in _STMT)
  32    3: SCOPE_NO_CLEANUPS_P (in SCOPE_STMT)
  33    4: SCOPE_PARTIAL_P (in SCOPE_STMT)
  34 */
  35
  36 /* Reserved identifiers.  */
  37
  38 enum rid
  39 {
  40   RID_UNUSED,
  41   RID_INT,
  42   RID_CHAR,
  43   RID_FLOAT,
  44   RID_DOUBLE,
  45   RID_VOID,
  46   RID_UNUSED1,
  47
  48   /* The first seven are in the order of most frequently used,
  49      as emiprically determined.  */
  50   RID_FIRST_MODIFIER,
  51   RID_EXTERN = RID_FIRST_MODIFIER,
  52   RID_CONST,
  53   RID_LONG,
  54   RID_TYPEDEF,
  55   RID_UNSIGNED,
  56   RID_SHORT,
  57   RID_INLINE,
  58   RID_AUTO,
  59   RID_STATIC,
  60   RID_REGISTER,
  61   RID_SIGNED,
  62   RID_RESTRICT,
  63   RID_VOLATILE,
  64   RID_BOUNDED,
  65   RID_UNBOUNDED,
  66   RID_NOALIAS,
  67   RID_ITERATOR,
  68   RID_COMPLEX,
  69
  70   RID_IN,
  71   RID_OUT,
  72   RID_INOUT,
  73   RID_BYCOPY,
  74   RID_BYREF,
  75   RID_ONEWAY,
  76   RID_ID,
  77
  78   RID_MAX
  79 };
  80
  81 #define NORID RID_UNUSED
  82
  83 /* The elements of `ridpointers' are identifier nodes for the reserved
  84    type names and storage classes.  It is indexed by a RID_... value.  */
  85 extern tree *ridpointers;
  86
  87 /* Standard named or nameless data types of the C compiler.  */
  88
  89 enum c_tree_index
  90 {
  91     CTI_WCHAR_TYPE,
  92     CTI_SIGNED_WCHAR_TYPE,
  93     CTI_UNSIGNED_WCHAR_TYPE,
  94     CTI_WIDEST_INT_LIT_TYPE,
  95     CTI_WIDEST_UINT_LIT_TYPE,
  96
  97     CTI_CHAR_ARRAY_TYPE,
  98     CTI_WCHAR_ARRAY_TYPE,
  99     CTI_INT_ARRAY_TYPE,
 100     CTI_STRING_TYPE,
 101     CTI_CONST_STRING_TYPE,
 102
 103     CTI_BOOLEAN_TYPE,
 104     CTI_BOOLEAN_TRUE,
 105     CTI_BOOLEAN_FALSE,
 106     CTI_DEFAULT_FUNCTION_TYPE,
 107     CTI_VOID_LIST,
 108
 109     CTI_VOID_FTYPE,
 110     CTI_VOID_FTYPE_PTR,
 111     CTI_INT_FTYPE_INT,
 112     CTI_PTR_FTYPE_SIZETYPE,
 113
 114     CTI_G77_INTEGER_TYPE,
 115     CTI_G77_UINTEGER_TYPE,
 116     CTI_G77_LONGINT_TYPE,
 117     CTI_G77_ULONGINT_TYPE,
 118
 119     CTI_MAX
 120 };
 121
 122 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 123 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 124 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 125 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 126 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 127
 128 #define boolean_type_node               c_global_trees[CTI_BOOLEAN_TYPE]
 129 #define boolean_true_node               c_global_trees[CTI_BOOLEAN_TRUE]
 130 #define boolean_false_node              c_global_trees[CTI_BOOLEAN_FALSE]
 131
 132 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 133 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 134 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 135 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 136 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 137
 138 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 139 #define void_list_node                  c_global_trees[CTI_VOID_LIST]
 140 #define void_ftype                      c_global_trees[CTI_VOID_FTYPE]
 141 #define void_ftype_ptr                  c_global_trees[CTI_VOID_FTYPE_PTR]
 142 #define int_ftype_int                   c_global_trees[CTI_INT_FTYPE_INT]
 143 #define ptr_ftype_sizetype              c_global_trees[CTI_PTR_FTYPE_SIZETYPE]
 144
 145 /* g77 integer types, which which must be kept in sync with f/com.h */
 146 #define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
 147 #define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
 148 #define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
 149 #define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
 150
 151 extern tree c_global_trees[CTI_MAX];
 152
 153 typedef enum c_language_kind
 154 {
 155   clk_c,           /* A dialect of C: K&R C, ANSI/ISO C89, C2000,
 156                        etc. */
 157   clk_cplusplus,   /* ANSI/ISO C++ */
 158   clk_objective_c  /* Objective C */
 159 }
 160 c_language_kind;
 161
 162 /* The variant of the C language being processed.  Each C language
 163    front-end defines this variable.  */
 164
 165 extern c_language_kind c_language;
 166
 167 /* Nonzero means give string constants the type `const char *', rather
 168    than `char *'.  */
 169
 170 extern int flag_const_strings;
 171
 172 /* Warn about *printf or *scanf format/argument anomalies. */
 173
 174 extern int warn_format;
 175
 176 /* Nonzero means do some things the same way PCC does.  */
 177
 178 extern int flag_traditional;
 179
 180 /* Nonzero means use the ISO C99 dialect of C.  */
 181
 182 extern int flag_isoc99;
 183
 184 /* Nonzero means accept digraphs.  */
 185
 186 extern int flag_digraphs;
 187
 188 /* Nonzero means warn about suggesting putting in ()'s.  */
 189
 190 extern int warn_parentheses;
 191
 192 /* Warn if a type conversion is done that might have confusing results.  */
 193
 194 extern int warn_conversion;
 195
 196 /* C types are partitioned into three subsets: object, function, and
 197    incomplete types.  */
 198 #define C_TYPE_OBJECT_P(type) \
 199   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 200
 201 #define C_TYPE_INCOMPLETE_P(type) \
 202   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 203
 204 #define C_TYPE_FUNCTION_P(type) \
 205   (TREE_CODE (type) == FUNCTION_TYPE)
 206
 207 /* For convenience we define a single macro to identify the class of
 208    object or incomplete types.  */
 209 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 210   (!C_TYPE_FUNCTION_P (type))
 211
 212 /* Record in each node resulting from a binary operator
 213    what operator was specified for it.  */
 214 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 215
 216 /* Pointer to function to generate the VAR_DECL for __FUNCTION__ etc.
 217    ID is the identifier to use, NAME is the string.
 218    TYPE_DEP indicates whether it depends on type of the function or not
 219    (i.e. __PRETTY_FUNCTION__).  */
 220
 221 extern tree (*make_fname_decl)                  PARAMS ((tree, const char *, int));
 222
 223 extern void declare_function_name               PARAMS ((void));
 224 extern void decl_attributes                     PARAMS ((tree, tree, tree));
 225 extern void init_function_format_info           PARAMS ((void));
 226 extern void check_function_format               PARAMS ((tree, tree, tree));
 227 extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
 228 /* Print an error message for invalid operands to arith operation CODE.
 229    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 230 extern void binary_op_error                     PARAMS ((enum tree_code));
 231 extern void c_expand_expr_stmt                  PARAMS ((tree));
 232 extern void c_expand_start_cond                 PARAMS ((tree, int, int));
 233 extern void c_expand_start_else                 PARAMS ((void));
 234 extern void c_expand_end_cond                   PARAMS ((void));
 235 /* Validate the expression after `case' and apply default promotions.  */
 236 extern tree check_case_value                    PARAMS ((tree));
 237 /* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
 238 extern tree combine_strings                     PARAMS ((tree));
 239 extern void constant_expression_warning         PARAMS ((tree));
 240 extern tree convert_and_check                   PARAMS ((tree, tree));
 241 extern void overflow_warning                    PARAMS ((tree));
 242 extern void unsigned_conversion_warning         PARAMS ((tree, tree));
 243
 244 /* Read the rest of the current #-directive line.  */
 245 #if USE_CPPLIB
 246 extern char *get_directive_line                 PARAMS ((void));
 247 #define GET_DIRECTIVE_LINE() get_directive_line ()
 248 #else
 249 extern char *get_directive_line                 PARAMS ((FILE *));
 250 #define GET_DIRECTIVE_LINE() get_directive_line (finput)
 251 #endif
 252
 253 /* Subroutine of build_binary_op, used for comparison operations.
 254    See if the operands have both been converted from subword integer types
 255    and, if so, perhaps change them both back to their original type.  */
 256 extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
 257 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
 258    or validate its data type for an `if' or `while' statement or ?..: exp. */
 259 extern tree truthvalue_conversion               PARAMS ((tree));
 260 extern tree type_for_mode                       PARAMS ((enum machine_mode, int));
 261 extern tree type_for_size                       PARAMS ((unsigned, int));
 262
 263 /* Build tree nodes and builtin functions common to both C and C++ language
 264    frontends.  */
 265 extern void c_common_nodes_and_builtins         PARAMS ((int, int, int));
 266
 267 extern tree build_va_arg                        PARAMS ((tree, tree));
 268
 269 /* Nonzero if the type T promotes to itself.
 270    ANSI C states explicitly the list of types that promote;
 271    in particular, short promotes to int even if they have the same width.  */
 272 #define C_PROMOTING_INTEGER_TYPE_P(t)                           \
 273   (TREE_CODE ((t)) == INTEGER_TYPE                              \
 274    && (TYPE_MAIN_VARIANT (t) == char_type_node                  \
 275        || TYPE_MAIN_VARIANT (t) == signed_char_type_node        \
 276        || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node      \
 277        || TYPE_MAIN_VARIANT (t) == short_integer_type_node      \
 278        || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node))
 279
 280 extern int self_promoting_args_p                PARAMS ((tree));
 281 extern tree simple_type_promotes_to             PARAMS ((tree));
 282
 283 /* These macros provide convenient access to the various _STMT nodes
 284    created when parsing template declarations.  */
 285
 286 /* IF_STMT accessors. These give access to the condtion of the if
 287    statement, the then block of the if statement, and the else block
 288    of the if stsatement if it exists. */
 289 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 290 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 291 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 292
 293 /* WHILE_STMT accessors. These give access to the condtion of the
 294    while statement and the body of the while statement, respectively. */
 295 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 296 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 297
 298 /* DO_STMT accessors. These give access to the condition of the do
 299    statement and the body of the do statement, respectively. */
 300 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 301 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 302
 303 /* RETURN_STMT accessor. This gives the expression associated with a
 304    return statement. */
 305 #define RETURN_EXPR(NODE)       TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 306
 307 /* EXPR_STMT accessor. This gives the expression associated with an
 308    expression statement. */
 309 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 310
 311 /* FOR_STMT accessors. These give access to the init statement,
 312    condition, update expression, and body of the for statement,
 313    respectively. */
 314 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 315 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 316 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 317 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 318
 319 /* SWITCH_STMT accessors. These give access to the condition and body
 320    of the switch statement, respectively. */
 321 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
 322 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
 323
 324 /* CASE_LABEL accessors. These give access to the high and low values
 325    of a case label, respectively. */
 326 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
 327 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
 328
 329 /* GOTO_STMT accessor. This gives access to the label associated with
 330    a goto statement. */
 331 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
 332
 333 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
 334    statements assocated with a compound statement. The result is the
 335    first statement in the list. Succeeding nodes can be acccessed by
 336    calling TREE_CHAIN on a node in the list. */
 337 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
 338
 339 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
 340    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
 341    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
 342    statement. */
 343 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
 344 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
 345 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
 346 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
 347 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
 348
 349 /* DECL_STMT accessor. This gives access to the DECL associated with
 350    the given declaration statement. */
 351 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
 352
 353 /* STMT_EXPR accessor. */
 354 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 355
 356 /* LABEL_STMT accessor. This gives access to the label associated with
 357    the given label statement. */
 358 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
 359
 360 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
 361 #define SCOPE_BEGIN_P(NODE) \
 362   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
 363
 364 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
 365 #define SCOPE_END_P(NODE) \
 366   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
 367
 368 /* The BLOCK containing the declarations contained in this scope.  */
 369 #define SCOPE_STMT_BLOCK(NODE) \
 370   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
 371
 372 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
 373 #define SCOPE_NULLIFIED_P(NODE) \
 374   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
 375
 376 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
 377    which should be treated as non-existant from the point of view of
 378    running cleanup actions.  */
 379 #define SCOPE_NO_CLEANUPS_P(NODE) \
 380   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
 381
 382 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
 383    For example, in:
 384
 385      S s;
 386      l:
 387      S s2;
 388      goto l;
 389
 390    there is (implicitly) a new scope after `l', even though there are
 391    no curly braces.  In particular, when we hit the goto, we must
 392    destroy s2 and then re-construct it.  For the implicit scope,
 393    SCOPE_PARTIAL_P will be set.  */
 394 #define SCOPE_PARTIAL_P(NODE) \
 395   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
 396
 397 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
 398 #define ASM_VOLATILE_P(NODE)                    \
 399   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
 400
 401 /* The line-number at which a statement began.  But if
 402    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
 403    line number for the end of the current function instead.  */
 404 #define STMT_LINENO(NODE)                       \
 405   (TREE_COMPLEXITY ((NODE)))
 406
 407 /* If non-zero, the STMT_LINENO for NODE is the line at which the
 408    function ended.  */
 409 #define STMT_LINENO_FOR_FN_P(NODE)              \
 410   (TREE_LANG_FLAG_2 ((NODE)))
 411
 412 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 413    initialization variables. */
 414 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 415
 416 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 417
 418 enum c_tree_code {
 419   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 420 #include "c-common.def"
 421   LAST_C_TREE_CODE
 422 };
 423
 424 #undef DEFTREECODE
 425
 426 extern void add_c_tree_codes                    PARAMS ((void));
 427 extern void genrtl_do_pushlevel                 PARAMS ((void));
 428 extern void genrtl_clear_out_block              PARAMS ((void));
 429 extern void genrtl_goto_stmt                    PARAMS ((tree));
 430 extern void genrtl_expr_stmt                    PARAMS ((tree));
 431 extern void genrtl_decl_stmt                    PARAMS ((tree));
 432 extern void genrtl_if_stmt                      PARAMS ((tree));
 433 extern void genrtl_while_stmt                   PARAMS ((tree));
 434 extern void genrtl_do_stmt                      PARAMS ((tree));
 435 extern void genrtl_return_stmt                  PARAMS ((tree));
 436 extern void genrtl_for_stmt                     PARAMS ((tree));
 437 extern void genrtl_break_stmt                   PARAMS ((void));
 438 extern void genrtl_continue_stmt                PARAMS ((void));
 439 extern void genrtl_scope_stmt                   PARAMS ((tree));
 440 extern void genrtl_switch_stmt                  PARAMS ((tree));
 441 extern void genrtl_case_label                   PARAMS ((tree, tree));
 442 extern void genrtl_compound_stmt                PARAMS ((tree));
 443 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
 444                                                          tree, tree,
 445                                                          tree));
 446 extern void genrtl_decl_cleanup                 PARAMS ((tree, tree));
 447 extern int stmts_are_full_exprs_p               PARAMS ((void));
 448 typedef void (*expand_expr_stmt_fn)             PARAMS ((tree));
 449 extern expand_expr_stmt_fn lang_expand_expr_stmt;
 450 extern int anon_aggr_type_p                     PARAMS ((tree));
 451
 452 /* For a VAR_DECL that is an anonymous union, these are the various
 453    sub-variables that make up the anonymous union.  */
 454 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 455
 456 extern void emit_local_var                      PARAMS ((tree));
 457 extern void make_rtl_for_local_static           PARAMS ((tree));
 458 extern tree expand_cond                         PARAMS ((tree));
 459 extern tree expand_stmt                         PARAMS ((tree));
 460 extern tree lang_expand_stmt                    PARAMS ((tree));
 461 extern void c_expand_return                     PARAMS ((tree));
 462 extern tree c_expand_start_case                 PARAMS ((tree));
 463 extern void do_case                             PARAMS ((tree, tree));
 464 extern tree build_stmt                          PARAMS ((enum tree_code, ...));
 465 extern tree build_case_label                    PARAMS ((tree, tree));
 466 extern tree build_continue_stmt                 PARAMS ((void));
 467 extern tree build_break_stmt                    PARAMS ((void));
 468 extern tree build_return_stmt                   PARAMS ((tree));
 469
 470 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
 471
 472 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
 473 extern int current_function_name_declared       PARAMS ((void));
 474 extern void set_current_function_name_declared  PARAMS ((int));
 475
 476 /* These functions must be defined by each front-end which implements
 477    a variant of the C language.  They are used in c-common.c.  */
 478
 479 extern tree build_unary_op                      PARAMS ((enum tree_code,
 480                                                          tree, int));
 481 extern tree build_binary_op                     PARAMS ((enum tree_code,
 482                                                          tree, tree, int));
 483 extern int lvalue_p                             PARAMS ((tree));
 484 extern tree default_conversion                  PARAMS ((tree));
 485
 486 /* Given two integer or real types, return the type for their sum.
 487    Given two compatible ANSI C types, returns the merged type.  */
 488
 489 extern tree common_type                         PARAMS ((tree, tree));