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 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    1: C_DECLARED_LABEL_FLAG (in LABEL_DECL)
  37       STMT_IS_FULL_EXPR_P (in _STMT)
  38    2: STMT_LINENO_FOR_FN_P (in _STMT)
  39    3: SCOPE_NO_CLEANUPS_P (in SCOPE_STMT)
  40    4: SCOPE_PARTIAL_P (in SCOPE_STMT)
  41 */
  42
  43 /* Reserved identifiers.  This is the union of all the keywords for C,
  44    C++, and Objective C.  All the type modifiers have to be in one
  45    block at the beginning, because they are used as mask bits.  There
  46    are 27 type modifiers; if we add many more we will have to redesign
  47    the mask mechanism.  */
  48
  49 enum rid
  50 {
  51   /* Modifiers: */
  52   /* C, in empirical order of frequency.  */
  53   RID_STATIC = 0,
  54   RID_UNSIGNED, RID_LONG,    RID_CONST, RID_EXTERN,
  55   RID_REGISTER, RID_TYPEDEF, RID_SHORT, RID_INLINE,
  56   RID_VOLATILE, RID_SIGNED,  RID_AUTO,  RID_RESTRICT,
  57
  58   /* C extensions */
  59   RID_BOUNDED, RID_UNBOUNDED, RID_COMPLEX,
  60
  61   /* C++ */
  62   RID_FRIEND, RID_VIRTUAL, RID_EXPLICIT, RID_EXPORT, RID_MUTABLE,
  63
  64   /* ObjC */
  65   RID_IN, RID_OUT, RID_INOUT, RID_BYCOPY, RID_BYREF, RID_ONEWAY,
  66
  67   /* C */
  68   RID_INT,     RID_CHAR,   RID_FLOAT,    RID_DOUBLE, RID_VOID,
  69   RID_ENUM,    RID_STRUCT, RID_UNION,    RID_IF,     RID_ELSE,
  70   RID_WHILE,   RID_DO,     RID_FOR,      RID_SWITCH, RID_CASE,
  71   RID_DEFAULT, RID_BREAK,  RID_CONTINUE, RID_RETURN, RID_GOTO,
  72   RID_SIZEOF,
  73
  74   /* C extensions */
  75   RID_ASM,       RID_TYPEOF,   RID_ALIGNOF,  RID_ATTRIBUTE,  RID_VA_ARG,
  76   RID_EXTENSION, RID_IMAGPART, RID_REALPART, RID_LABEL,      RID_PTRBASE,
  77   RID_PTREXTENT, RID_PTRVALUE,
  78
  79   /* Too many ways of getting the name of a function as a string */
  80   RID_FUNCTION_NAME, RID_PRETTY_FUNCTION_NAME, RID_C99_FUNCTION_NAME,
  81
  82   /* C++ */
  83   RID_BOOL,     RID_WCHAR,    RID_CLASS,
  84   RID_PUBLIC,   RID_PRIVATE,  RID_PROTECTED,
  85   RID_TEMPLATE, RID_NULL,     RID_CATCH,
  86   RID_DELETE,   RID_FALSE,    RID_NAMESPACE,
  87   RID_NEW,      RID_OPERATOR, RID_THIS,
  88   RID_THROW,    RID_TRUE,     RID_TRY,
  89   RID_TYPENAME, RID_TYPEID,   RID_USING,
  90
  91   /* casts */
  92   RID_CONSTCAST, RID_DYNCAST, RID_REINTCAST, RID_STATCAST,
  93
  94   /* alternate spellings */
  95   RID_AND, RID_AND_EQ, RID_NOT, RID_NOT_EQ,
  96   RID_OR,  RID_OR_EQ,  RID_XOR, RID_XOR_EQ,
  97   RID_BITAND, RID_BITOR, RID_COMPL,
  98
  99   /* Objective C */
 100   RID_ID,          RID_AT_ENCODE,    RID_AT_END,
 101   RID_AT_CLASS,    RID_AT_ALIAS,     RID_AT_DEFS,
 102   RID_AT_PRIVATE,  RID_AT_PROTECTED, RID_AT_PUBLIC,
 103   RID_AT_PROTOCOL, RID_AT_SELECTOR,  RID_AT_INTERFACE,
 104   RID_AT_IMPLEMENTATION,
 105
 106   RID_MAX,
 107
 108   RID_FIRST_MODIFIER = RID_STATIC,
 109   RID_LAST_MODIFIER = RID_ONEWAY,
 110
 111   RID_FIRST_AT = RID_AT_ENCODE,
 112   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 113   RID_FIRST_PQ = RID_IN,
 114   RID_LAST_PQ = RID_ONEWAY
 115 };
 116
 117 #define OBJC_IS_AT_KEYWORD(rid) \
 118   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 119    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 120
 121 #define OBJC_IS_PQ_KEYWORD(rid) \
 122   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 123    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 124
 125 /* The elements of `ridpointers' are identifier nodes for the reserved
 126    type names and storage classes.  It is indexed by a RID_... value.  */
 127 extern tree *ridpointers;
 128
 129 /* Standard named or nameless data types of the C compiler.  */
 130
 131 enum c_tree_index
 132 {
 133     CTI_WCHAR_TYPE,
 134     CTI_SIGNED_WCHAR_TYPE,
 135     CTI_UNSIGNED_WCHAR_TYPE,
 136     CTI_WINT_TYPE,
 137     CTI_C_SIZE_TYPE, /* The type used for the size_t typedef and the
 138                         result type of sizeof (an ordinary type without
 139                         TYPE_IS_SIZETYPE set, unlike the internal
 140                         sizetype).  */
 141     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 142     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 143     CTI_INTMAX_TYPE,
 144     CTI_UINTMAX_TYPE,
 145     CTI_WIDEST_INT_LIT_TYPE,
 146     CTI_WIDEST_UINT_LIT_TYPE,
 147
 148     CTI_CHAR_ARRAY_TYPE,
 149     CTI_WCHAR_ARRAY_TYPE,
 150     CTI_INT_ARRAY_TYPE,
 151     CTI_STRING_TYPE,
 152     CTI_CONST_STRING_TYPE,
 153
 154     /* Type for boolean expressions (bool in C++, int in C).  */
 155     CTI_BOOLEAN_TYPE,
 156     CTI_BOOLEAN_TRUE,
 157     CTI_BOOLEAN_FALSE,
 158     /* C99's _Bool type.  */
 159     CTI_C_BOOL_TYPE,
 160     CTI_C_BOOL_TRUE,
 161     CTI_C_BOOL_FALSE,
 162     CTI_DEFAULT_FUNCTION_TYPE,
 163
 164     CTI_G77_INTEGER_TYPE,
 165     CTI_G77_UINTEGER_TYPE,
 166     CTI_G77_LONGINT_TYPE,
 167     CTI_G77_ULONGINT_TYPE,
 168
 169     /* These are not types, but we have to look them up all the time.  */
 170     CTI_FUNCTION_NAME_DECL,
 171     CTI_PRETTY_FUNCTION_NAME_DECL,
 172     CTI_C99_FUNCTION_NAME_DECL,
 173     CTI_SAVED_FUNCTION_NAME_DECLS,
 174
 175     CTI_VOID_ZERO,
 176
 177     CTI_MAX
 178 };
 179
 180 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 181
 182 /* Identifier part common to the C front ends.  Inherits from
 183    tree_identifier, despite appearances.  */
 184 struct c_common_identifier
 185 {
 186   struct tree_common common;
 187   struct cpp_hashnode node;
 188 };
 189
 190 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 191 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 192 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 193 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 194 #define c_size_type_node                c_global_trees[CTI_C_SIZE_TYPE]
 195 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 196 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 197 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 198 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 199 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 200 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 201
 202 #define boolean_type_node               c_global_trees[CTI_BOOLEAN_TYPE]
 203 #define boolean_true_node               c_global_trees[CTI_BOOLEAN_TRUE]
 204 #define boolean_false_node              c_global_trees[CTI_BOOLEAN_FALSE]
 205
 206 #define c_bool_type_node                c_global_trees[CTI_C_BOOL_TYPE]
 207 #define c_bool_true_node                c_global_trees[CTI_C_BOOL_TRUE]
 208 #define c_bool_false_node               c_global_trees[CTI_C_BOOL_FALSE]
 209
 210 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 211 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 212 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 213 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 214 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 215
 216 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 217
 218 /* g77 integer types, which which must be kept in sync with f/com.h */
 219 #define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
 220 #define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
 221 #define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
 222 #define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
 223
 224 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 225 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 226 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 227 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 228
 229 /* A node for `((void) 0)'.  */
 230 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 231
 232 extern tree c_global_trees[CTI_MAX];
 233
 234 /* Mark which labels are explicitly declared.
 235    These may be shadowed, and may be referenced from nested functions.  */
 236 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 237
 238 typedef enum c_language_kind
 239 {
 240   clk_c,           /* A dialect of C: K&R C, ANSI/ISO C89, C2000,
 241                        etc.  */
 242   clk_cplusplus,   /* ANSI/ISO C++ */
 243   clk_objective_c  /* Objective C */
 244 }
 245 c_language_kind;
 246
 247 /* Information about a statement tree.  */
 248
 249 struct stmt_tree_s {
 250   /* The last statement added to the tree.  */
 251   tree x_last_stmt;
 252   /* The type of the last expression statement.  (This information is
 253      needed to implement the statement-expression extension.)  */
 254   tree x_last_expr_type;
 255   /* In C++, Non-zero if we should treat statements as full
 256      expressions.  In particular, this variable is no-zero if at the
 257      end of a statement we should destroy any temporaries created
 258      during that statement.  Similarly, if, at the end of a block, we
 259      should destroy any local variables in this block.  Normally, this
 260      variable is non-zero, since those are the normal semantics of
 261      C++.
 262
 263      However, in order to represent aggregate initialization code as
 264      tree structure, we use statement-expressions.  The statements
 265      within the statement expression should not result in cleanups
 266      being run until the entire enclosing statement is complete.
 267
 268      This flag has no effect in C.  */
 269   int stmts_are_full_exprs_p;
 270 };
 271
 272 typedef struct stmt_tree_s *stmt_tree;
 273
 274 /* Global state pertinent to the current function.  Some C dialects
 275    extend this structure with additional fields.  */
 276
 277 struct language_function {
 278   /* While we are parsing the function, this contains information
 279      about the statement-tree that we are building.  */
 280   struct stmt_tree_s x_stmt_tree;
 281   /* The stack of SCOPE_STMTs for the current function.  */
 282   tree x_scope_stmt_stack;
 283 };
 284
 285 /* When building a statement-tree, this is the last statement added to
 286    the tree.  */
 287
 288 #define last_tree (current_stmt_tree ()->x_last_stmt)
 289
 290 /* The type of the last expression-statement we have seen.  */
 291
 292 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 293
 294 /* LAST_TREE contains the last statement parsed.  These are chained
 295    together through the TREE_CHAIN field, but often need to be
 296    re-organized since the parse is performed bottom-up.  This macro
 297    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 298
 299 #define RECHAIN_STMTS(stmt, substmt)            \
 300   do {                                          \
 301     substmt = TREE_CHAIN (stmt);                \
 302     TREE_CHAIN (stmt) = NULL_TREE;              \
 303     last_tree = stmt;                           \
 304   } while (0)
 305
 306 /* Language-specific hooks.  */
 307
 308 extern int (*lang_statement_code_p)             PARAMS ((enum tree_code));
 309 extern void (*lang_expand_stmt)                 PARAMS ((tree));
 310 extern void (*lang_expand_decl_stmt)            PARAMS ((tree));
 311 extern void (*lang_expand_function_end)         PARAMS ((void));
 312
 313 /* Callback that determines if it's ok for a function to have no
 314    noreturn attribute.  */
 315 extern int (*lang_missing_noreturn_ok_p)        PARAMS ((tree));
 316
 317
 318 extern stmt_tree current_stmt_tree              PARAMS ((void));
 319 extern tree *current_scope_stmt_stack           PARAMS ((void));
 320 extern void begin_stmt_tree                     PARAMS ((tree *));
 321 extern tree add_stmt                            PARAMS ((tree));
 322 extern void add_decl_stmt                       PARAMS ((tree));
 323 extern tree add_scope_stmt                      PARAMS ((int, int));
 324 extern void finish_stmt_tree                    PARAMS ((tree *));
 325
 326 extern int statement_code_p                     PARAMS ((enum tree_code));
 327 extern tree walk_stmt_tree                      PARAMS ((tree *,
 328                                                          walk_tree_fn,
 329                                                          void *));
 330 extern void prep_stmt                           PARAMS ((tree));
 331 extern void expand_stmt                         PARAMS ((tree));
 332 extern void mark_stmt_tree                      PARAMS ((void *));
 333
 334 /* Extra information associated with a DECL.  Other C dialects extend
 335    this structure in various ways.  The C front-end only uses this
 336    structure for FUNCTION_DECLs; all other DECLs have a NULL
 337    DECL_LANG_SPECIFIC field.  */
 338
 339 struct c_lang_decl {
 340   unsigned declared_inline : 1;
 341 };
 342
 343 /* In a FUNCTION_DECL for which DECL_BUILT_IN does not hold, this is
 344      the approximate number of statements in this function.  There is
 345      no need for this number to be exact; it is only used in various
 346      heuristics regarding optimization.  */
 347 #define DECL_NUM_STMTS(NODE) \
 348   (FUNCTION_DECL_CHECK (NODE)->decl.u1.i)
 349
 350 extern void c_mark_lang_decl                    PARAMS ((struct c_lang_decl *));
 351
 352 /* The variant of the C language being processed.  Each C language
 353    front-end defines this variable.  */
 354
 355 extern c_language_kind c_language;
 356
 357 /* Nonzero means give string constants the type `const char *', rather
 358    than `char *'.  */
 359
 360 extern int flag_const_strings;
 361
 362 /* Nonzero means give `double' the same size as `float'.  */
 363
 364 extern int flag_short_double;
 365
 366 /* Nonzero means give `wchar_t' the same size as `short'.  */
 367
 368 extern int flag_short_wchar;
 369
 370 /* Warn about *printf or *scanf format/argument anomalies.  */
 371
 372 extern int warn_format;
 373
 374 /* Warn about Y2K problems with strftime formats.  */
 375
 376 extern int warn_format_y2k;
 377
 378 /* Warn about excess arguments to formats.  */
 379
 380 extern int warn_format_extra_args;
 381
 382 /* Warn about non-literal format arguments.  */
 383
 384 extern int warn_format_nonliteral;
 385
 386 /* Warn about possible security problems with calls to format functions.  */
 387
 388 extern int warn_format_security;
 389
 390 /* Warn about possible violations of sequence point rules.  */
 391
 392 extern int warn_sequence_point;
 393
 394 /* Warn about functions which might be candidates for format attributes.  */
 395
 396 extern int warn_missing_format_attribute;
 397
 398 /* Nonzero means warn about sizeof (function) or addition/subtraction
 399    of function pointers.  */
 400
 401 extern int warn_pointer_arith;
 402
 403 /* Nonzero means to warn about compile-time division by zero.  */
 404 extern int warn_div_by_zero;
 405
 406 /* Nonzero means do some things the same way PCC does.  */
 407
 408 extern int flag_traditional;
 409
 410 /* Nonzero means enable C89 Amendment 1 features.  */
 411
 412 extern int flag_isoc94;
 413
 414 /* Nonzero means use the ISO C99 dialect of C.  */
 415
 416 extern int flag_isoc99;
 417
 418 /* Nonzero means environment is hosted (i.e., not freestanding) */
 419
 420 extern int flag_hosted;
 421
 422 /* Nonzero means add default format_arg attributes for functions not
 423    in ISO C.  */
 424
 425 extern int flag_noniso_default_format_attributes;
 426
 427 /* Nonzero means don't recognize any builtin functions.  */
 428
 429 extern int flag_no_builtin;
 430
 431 /* Nonzero means don't recognize the non-ANSI builtin functions.
 432    -ansi sets this.  */
 433
 434 extern int flag_no_nonansi_builtin;
 435
 436 /* Nonzero means warn about suggesting putting in ()'s.  */
 437
 438 extern int warn_parentheses;
 439
 440 /* Warn if a type conversion is done that might have confusing results.  */
 441
 442 extern int warn_conversion;
 443
 444 /* Nonzero means warn about usage of long long,
 445    when `-pedantic' and not C99.  */
 446
 447 extern int warn_long_long;
 448
 449 /* C types are partitioned into three subsets: object, function, and
 450    incomplete types.  */
 451 #define C_TYPE_OBJECT_P(type) \
 452   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 453
 454 #define C_TYPE_INCOMPLETE_P(type) \
 455   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 456
 457 #define C_TYPE_FUNCTION_P(type) \
 458   (TREE_CODE (type) == FUNCTION_TYPE)
 459
 460 /* For convenience we define a single macro to identify the class of
 461    object or incomplete types.  */
 462 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 463   (!C_TYPE_FUNCTION_P (type))
 464
 465 /* Record in each node resulting from a binary operator
 466    what operator was specified for it.  */
 467 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 468
 469 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 470    ID is the identifier to use, NAME is the string.
 471    TYPE_DEP indicates whether it depends on type of the function or not
 472    (i.e. __PRETTY_FUNCTION__).  */
 473
 474 extern tree (*make_fname_decl)                  PARAMS ((tree, int));
 475
 476 extern tree identifier_global_value             PARAMS ((tree));
 477 extern void record_builtin_type                 PARAMS ((enum rid,
 478                                                          const char *, tree));
 479 extern tree build_void_list_node                PARAMS ((void));
 480 extern void start_fname_decls                   PARAMS ((void));
 481 extern void finish_fname_decls                  PARAMS ((void));
 482 extern const char *fname_as_string              PARAMS ((int));
 483 extern tree fname_decl                          PARAMS ((unsigned, tree));
 484 extern const char *fname_string                 PARAMS ((unsigned));
 485
 486 extern void check_function_format               PARAMS ((int *, tree, tree));
 487 extern void set_Wformat                         PARAMS ((int));
 488 extern tree handle_format_attribute             PARAMS ((tree *, tree, tree,
 489                                                          int, bool *));
 490 extern tree handle_format_arg_attribute         PARAMS ((tree *, tree, tree,
 491                                                          int, bool *));
 492 extern void c_common_insert_default_attributes  PARAMS ((tree));
 493 extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
 494 extern tree c_sizeof                            PARAMS ((tree));
 495 extern tree c_alignof                           PARAMS ((tree));
 496 extern tree c_alignof_expr                      PARAMS ((tree));
 497 /* Print an error message for invalid operands to arith operation CODE.
 498    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 499 extern void binary_op_error                     PARAMS ((enum tree_code));
 500 extern tree c_expand_expr_stmt                  PARAMS ((tree));
 501 extern void c_expand_start_cond                 PARAMS ((tree, int));
 502 extern void c_finish_then                       PARAMS ((void));
 503 extern void c_expand_start_else                 PARAMS ((void));
 504 extern void c_finish_else                   PARAMS ((void));
 505 extern void c_expand_end_cond                   PARAMS ((void));
 506 /* Validate the expression after `case' and apply default promotions.  */
 507 extern tree check_case_value                    PARAMS ((tree));
 508 /* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
 509 extern tree combine_strings                     PARAMS ((tree));
 510 extern void constant_expression_warning         PARAMS ((tree));
 511 extern tree convert_and_check                   PARAMS ((tree, tree));
 512 extern void overflow_warning                    PARAMS ((tree));
 513 extern void unsigned_conversion_warning         PARAMS ((tree, tree));
 514
 515 /* Read the rest of the current #-directive line.  */
 516 extern char *get_directive_line                 PARAMS ((void));
 517 #define GET_DIRECTIVE_LINE() get_directive_line ()
 518
 519 /* Subroutine of build_binary_op, used for comparison operations.
 520    See if the operands have both been converted from subword integer types
 521    and, if so, perhaps change them both back to their original type.  */
 522 extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
 523
 524 extern unsigned int min_precision               PARAMS ((tree, int));
 525
 526 /* Add qualifiers to a type, in the fashion for C.  */
 527 extern tree c_build_qualified_type              PARAMS ((tree, int));
 528
 529 /* Build tree nodes and builtin functions common to both C and C++ language
 530    frontends.  */
 531 extern void c_common_nodes_and_builtins         PARAMS ((void));
 532
 533 extern void disable_builtin_function            PARAMS ((const char *));
 534
 535 extern tree build_va_arg                        PARAMS ((tree, tree));
 536
 537 extern const char *c_common_lang_init           PARAMS ((const char *));
 538 extern void c_common_finish                     PARAMS ((void));
 539 extern HOST_WIDE_INT c_common_get_alias_set     PARAMS ((tree));
 540 extern bool c_promoting_integer_type_p          PARAMS ((tree));
 541 extern int self_promoting_args_p                PARAMS ((tree));
 542 extern tree simple_type_promotes_to             PARAMS ((tree));
 543 extern tree strip_array_types                   PARAMS ((tree));
 544
 545 /* These macros provide convenient access to the various _STMT nodes.  */
 546
 547 /* Nonzero if this statement should be considered a full-expression,
 548    i.e., if temporaries created during this statement should have
 549    their destructors run at the end of this statement.  (In C, this
 550    will always be false, since there are no destructors.)  */
 551 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 552
 553 /* IF_STMT accessors. These give access to the condition of the if
 554    statement, the then block of the if statement, and the else block
 555    of the if statement if it exists.  */
 556 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 557 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 558 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 559
 560 /* WHILE_STMT accessors. These give access to the condition of the
 561    while statement and the body of the while statement, respectively.  */
 562 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 563 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 564
 565 /* DO_STMT accessors. These give access to the condition of the do
 566    statement and the body of the do statement, respectively.  */
 567 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 568 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 569
 570 /* RETURN_STMT accessors. These give the expression associated with a
 571    return statement, and whether it should be ignored when expanding
 572    (as opposed to inlining).  */
 573 #define RETURN_EXPR(NODE)       TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 574
 575 /* EXPR_STMT accessor. This gives the expression associated with an
 576    expression statement.  */
 577 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 578
 579 /* FOR_STMT accessors. These give access to the init statement,
 580    condition, update expression, and body of the for statement,
 581    respectively.  */
 582 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 583 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 584 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 585 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 586
 587 /* SWITCH_STMT accessors. These give access to the condition and body
 588    of the switch statement, respectively.  */
 589 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
 590 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
 591
 592 /* CASE_LABEL accessors. These give access to the high and low values
 593    of a case label, respectively.  */
 594 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
 595 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
 596 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
 597
 598 /* GOTO_STMT accessor. This gives access to the label associated with
 599    a goto statement.  */
 600 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
 601
 602 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
 603    statements associated with a compound statement. The result is the
 604    first statement in the list. Succeeding nodes can be accessed by
 605    calling TREE_CHAIN on a node in the list.  */
 606 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
 607
 608 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
 609    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
 610    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
 611    statement.  */
 612 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
 613 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
 614 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
 615 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
 616 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
 617
 618 /* DECL_STMT accessor. This gives access to the DECL associated with
 619    the given declaration statement.  */
 620 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
 621
 622 /* STMT_EXPR accessor.  */
 623 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 624
 625 /* LABEL_STMT accessor. This gives access to the label associated with
 626    the given label statement.  */
 627 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
 628
 629 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
 630 #define SCOPE_BEGIN_P(NODE) \
 631   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
 632
 633 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
 634 #define SCOPE_END_P(NODE) \
 635   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
 636
 637 /* The BLOCK containing the declarations contained in this scope.  */
 638 #define SCOPE_STMT_BLOCK(NODE) \
 639   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
 640
 641 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
 642 #define SCOPE_NULLIFIED_P(NODE) \
 643   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
 644
 645 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
 646    which should be treated as non-existent from the point of view of
 647    running cleanup actions.  */
 648 #define SCOPE_NO_CLEANUPS_P(NODE) \
 649   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
 650
 651 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
 652    For example, in:
 653
 654      S s;
 655      l:
 656      S s2;
 657      goto l;
 658
 659    there is (implicitly) a new scope after `l', even though there are
 660    no curly braces.  In particular, when we hit the goto, we must
 661    destroy s2 and then re-construct it.  For the implicit scope,
 662    SCOPE_PARTIAL_P will be set.  */
 663 #define SCOPE_PARTIAL_P(NODE) \
 664   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
 665
 666 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
 667 #define ASM_VOLATILE_P(NODE)                    \
 668   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
 669
 670 /* The line-number at which a statement began.  But if
 671    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
 672    line number for the end of the current function instead.  */
 673 #define STMT_LINENO(NODE)                       \
 674   (TREE_COMPLEXITY ((NODE)))
 675
 676 /* If non-zero, the STMT_LINENO for NODE is the line at which the
 677    function ended.  */
 678 #define STMT_LINENO_FOR_FN_P(NODE)              \
 679   (TREE_LANG_FLAG_2 ((NODE)))
 680
 681 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 682    initialization variables.  */
 683 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 684
 685 /* Nonzero if we want to create an ASM_INPUT instead of an
 686    ASM_OPERAND with no operands.  */
 687 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 688
 689 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 690
 691 enum c_tree_code {
 692   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 693 #include "c-common.def"
 694   LAST_C_TREE_CODE
 695 };
 696
 697 #undef DEFTREECODE
 698
 699 extern void add_c_tree_codes                    PARAMS ((void));
 700 extern void genrtl_do_pushlevel                 PARAMS ((void));
 701 extern void genrtl_goto_stmt                    PARAMS ((tree));
 702 extern void genrtl_expr_stmt                    PARAMS ((tree));
 703 extern void genrtl_decl_stmt                    PARAMS ((tree));
 704 extern void genrtl_if_stmt                      PARAMS ((tree));
 705 extern void genrtl_while_stmt                   PARAMS ((tree));
 706 extern void genrtl_do_stmt                      PARAMS ((tree));
 707 extern void genrtl_return_stmt                  PARAMS ((tree));
 708 extern void genrtl_for_stmt                     PARAMS ((tree));
 709 extern void genrtl_break_stmt                   PARAMS ((void));
 710 extern void genrtl_continue_stmt                PARAMS ((void));
 711 extern void genrtl_scope_stmt                   PARAMS ((tree));
 712 extern void genrtl_switch_stmt                  PARAMS ((tree));
 713 extern void genrtl_case_label                   PARAMS ((tree));
 714 extern void genrtl_compound_stmt                PARAMS ((tree));
 715 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
 716                                                          tree, tree,
 717                                                          tree, int));
 718 extern void genrtl_decl_cleanup                 PARAMS ((tree, tree));
 719 extern int stmts_are_full_exprs_p               PARAMS ((void));
 720 extern int anon_aggr_type_p                     PARAMS ((tree));
 721
 722 /* For a VAR_DECL that is an anonymous union, these are the various
 723    sub-variables that make up the anonymous union.  */
 724 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 725
 726 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 727 #define DECL_C_BIT_FIELD(NODE) \
 728   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 729 #define SET_DECL_C_BIT_FIELD(NODE) \
 730   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 731 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 732   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 733
 734 /* In a VAR_DECL, nonzero if the decl is a register variable with
 735    an explicit asm specification.  */
 736 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
 737
 738 extern void emit_local_var                      PARAMS ((tree));
 739 extern void make_rtl_for_local_static           PARAMS ((tree));
 740 extern tree expand_cond                         PARAMS ((tree));
 741 extern tree c_expand_return                     PARAMS ((tree));
 742 extern tree do_case                             PARAMS ((tree, tree));
 743 extern tree build_stmt                          PARAMS ((enum tree_code, ...));
 744 extern tree build_case_label                    PARAMS ((tree, tree, tree));
 745 extern tree build_continue_stmt                 PARAMS ((void));
 746 extern tree build_break_stmt                    PARAMS ((void));
 747 extern tree build_return_stmt                   PARAMS ((tree));
 748
 749 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
 750
 751 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
 752
 753 /* These functions must be defined by each front-end which implements
 754    a variant of the C language.  They are used in c-common.c.  */
 755
 756 extern tree build_unary_op                      PARAMS ((enum tree_code,
 757                                                          tree, int));
 758 extern tree build_binary_op                     PARAMS ((enum tree_code,
 759                                                          tree, tree, int));
 760 extern int lvalue_p                             PARAMS ((tree));
 761 extern tree default_conversion                  PARAMS ((tree));
 762
 763 /* Given two integer or real types, return the type for their sum.
 764    Given two compatible ANSI C types, returns the merged type.  */
 765
 766 extern tree common_type                         PARAMS ((tree, tree));
 767
 768 extern tree expand_tree_builtin                 PARAMS ((tree, tree, tree));
 769
 770 extern tree decl_constant_value         PARAMS ((tree));
 771
 772 /* Handle increment and decrement of boolean types.  */
 773 extern tree boolean_increment                   PARAMS ((enum tree_code,
 774                                                          tree));
 775
 776 /* Hook currently used only by the C++ front end to reset internal state
 777    after entering or leaving a header file.  */
 778 extern void extract_interface_info              PARAMS ((void));
 779
 780 extern void mark_c_language_function            PARAMS ((struct language_function *));
 781
 782 extern int case_compare                         PARAMS ((splay_tree_key,
 783                                                          splay_tree_key));
 784
 785 extern tree c_add_case_label                    PARAMS ((splay_tree,
 786                                                          tree, tree,
 787                                                          tree));
 788
 789 extern tree build_function_call                 PARAMS ((tree, tree));
 790
 791 extern tree finish_label_address_expr           PARAMS ((tree));
 792
 793 /* Same function prototype, but the C and C++ front ends have
 794    different implementations.  Used in c-common.c.  */
 795 extern tree lookup_label                        PARAMS ((tree));
 796
 797 /* If this variable is defined to a non-NULL value, it will be called
 798    after the file has been completely parsed.  The argument will be
 799    the GLOBAL_NAMESPACE in C++, or the list of top-level declarations
 800    in C.  */
 801 extern void (*back_end_hook) PARAMS ((tree));
 802
 803 #ifdef RTX_CODE
 804
 805 extern struct rtx_def *c_expand_expr            PARAMS ((tree, rtx,
 806                                                          enum machine_mode,
 807                                                          enum expand_modifier));
 808
 809 extern int c_safe_from_p                        PARAMS ((rtx, tree));
 810 #endif
 811
 812 extern int c_unsafe_for_reeval                  PARAMS ((tree));
 813
 814 /* Information recorded about each file examined during compilation.  */
 815
 816 struct c_fileinfo
 817 {
 818   int time;     /* Time spent in the file.  */
 819   short interface_only;         /* Flags - used only by C++ */
 820   short interface_unknown;
 821 };
 822
 823 struct c_fileinfo *get_fileinfo                 PARAMS ((const char *));
 824 extern void dump_time_statistics                PARAMS ((void));
 825
 826 #endif /* ! GCC_C_COMMON_H */