gcc/c-common.h

   1 /* Definitions for c-common.c.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_C_COMMON_H
  23 #define GCC_C_COMMON_H
  24
  25 #include "splay-tree.h"
  26 #include "cpplib.h"
  27
  28 /* Usage of TREE_LANG_FLAG_?:
  29    0: COMPOUND_STMT_NO_SCOPE (in COMPOUND_STMT).
  30       TREE_NEGATED_INT (in INTEGER_CST).
  31       IDENTIFIER_MARKED (used by search routines).
  32       SCOPE_BEGIN_P (in SCOPE_STMT)
  33       DECL_PRETTY_FUNCTION_P (in VAR_DECL)
  34       NEW_FOR_SCOPE_P (in FOR_STMT)
  35       ASM_INPUT_P (in ASM_STMT)
  36    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       COMPOUND_STMT_BODY_BLOCK (in COMPOUND_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_IN, 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, RID_CHOOSE_EXPR, RID_TYPES_COMPATIBLE_P,
  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   RID_FIRST_AT = RID_AT_ENCODE,
 113   RID_LAST_AT = RID_AT_IMPLEMENTATION,
 114   RID_FIRST_PQ = RID_IN,
 115   RID_LAST_PQ = RID_ONEWAY
 116 };
 117
 118 #define OBJC_IS_AT_KEYWORD(rid) \
 119   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_AT && \
 120    (unsigned int)(rid) <= (unsigned int)RID_LAST_AT)
 121
 122 #define OBJC_IS_PQ_KEYWORD(rid) \
 123   ((unsigned int)(rid) >= (unsigned int)RID_FIRST_PQ && \
 124    (unsigned int)(rid) <= (unsigned int)RID_LAST_PQ)
 125
 126 /* The elements of `ridpointers' are identifier nodes for the reserved
 127    type names and storage classes.  It is indexed by a RID_... value.  */
 128 extern tree *ridpointers;
 129
 130 /* Standard named or nameless data types of the C compiler.  */
 131
 132 enum c_tree_index
 133 {
 134     CTI_WCHAR_TYPE,
 135     CTI_SIGNED_WCHAR_TYPE,
 136     CTI_UNSIGNED_WCHAR_TYPE,
 137     CTI_WINT_TYPE,
 138     CTI_C_SIZE_TYPE, /* The type used for the size_t typedef and the
 139                         result type of sizeof (an ordinary type without
 140                         TYPE_IS_SIZETYPE set, unlike the internal
 141                         sizetype).  */
 142     CTI_SIGNED_SIZE_TYPE, /* For format checking only.  */
 143     CTI_UNSIGNED_PTRDIFF_TYPE, /* For format checking only.  */
 144     CTI_INTMAX_TYPE,
 145     CTI_UINTMAX_TYPE,
 146     CTI_WIDEST_INT_LIT_TYPE,
 147     CTI_WIDEST_UINT_LIT_TYPE,
 148
 149     CTI_CHAR_ARRAY_TYPE,
 150     CTI_WCHAR_ARRAY_TYPE,
 151     CTI_INT_ARRAY_TYPE,
 152     CTI_STRING_TYPE,
 153     CTI_CONST_STRING_TYPE,
 154
 155     /* Type for boolean expressions (bool in C++, int in C).  */
 156     CTI_BOOLEAN_TYPE,
 157     CTI_BOOLEAN_TRUE,
 158     CTI_BOOLEAN_FALSE,
 159     /* C99's _Bool type.  */
 160     CTI_C_BOOL_TYPE,
 161     CTI_C_BOOL_TRUE,
 162     CTI_C_BOOL_FALSE,
 163     CTI_DEFAULT_FUNCTION_TYPE,
 164
 165     CTI_G77_INTEGER_TYPE,
 166     CTI_G77_UINTEGER_TYPE,
 167     CTI_G77_LONGINT_TYPE,
 168     CTI_G77_ULONGINT_TYPE,
 169
 170     /* These are not types, but we have to look them up all the time.  */
 171     CTI_FUNCTION_NAME_DECL,
 172     CTI_PRETTY_FUNCTION_NAME_DECL,
 173     CTI_C99_FUNCTION_NAME_DECL,
 174     CTI_SAVED_FUNCTION_NAME_DECLS,
 175
 176     CTI_VOID_ZERO,
 177
 178     CTI_MAX
 179 };
 180
 181 #define C_RID_CODE(id)  (((struct c_common_identifier *) (id))->node.rid_code)
 182
 183 /* Identifier part common to the C front ends.  Inherits from
 184    tree_identifier, despite appearances.  */
 185 struct c_common_identifier
 186 {
 187   struct tree_common common;
 188   struct cpp_hashnode node;
 189 };
 190
 191 #define wchar_type_node                 c_global_trees[CTI_WCHAR_TYPE]
 192 #define signed_wchar_type_node          c_global_trees[CTI_SIGNED_WCHAR_TYPE]
 193 #define unsigned_wchar_type_node        c_global_trees[CTI_UNSIGNED_WCHAR_TYPE]
 194 #define wint_type_node                  c_global_trees[CTI_WINT_TYPE]
 195 #define c_size_type_node                c_global_trees[CTI_C_SIZE_TYPE]
 196 #define signed_size_type_node           c_global_trees[CTI_SIGNED_SIZE_TYPE]
 197 #define unsigned_ptrdiff_type_node      c_global_trees[CTI_UNSIGNED_PTRDIFF_TYPE]
 198 #define intmax_type_node                c_global_trees[CTI_INTMAX_TYPE]
 199 #define uintmax_type_node               c_global_trees[CTI_UINTMAX_TYPE]
 200 #define widest_integer_literal_type_node c_global_trees[CTI_WIDEST_INT_LIT_TYPE]
 201 #define widest_unsigned_literal_type_node c_global_trees[CTI_WIDEST_UINT_LIT_TYPE]
 202
 203 #define boolean_type_node               c_global_trees[CTI_BOOLEAN_TYPE]
 204 #define boolean_true_node               c_global_trees[CTI_BOOLEAN_TRUE]
 205 #define boolean_false_node              c_global_trees[CTI_BOOLEAN_FALSE]
 206
 207 #define c_bool_type_node                c_global_trees[CTI_C_BOOL_TYPE]
 208 #define c_bool_true_node                c_global_trees[CTI_C_BOOL_TRUE]
 209 #define c_bool_false_node               c_global_trees[CTI_C_BOOL_FALSE]
 210
 211 #define char_array_type_node            c_global_trees[CTI_CHAR_ARRAY_TYPE]
 212 #define wchar_array_type_node           c_global_trees[CTI_WCHAR_ARRAY_TYPE]
 213 #define int_array_type_node             c_global_trees[CTI_INT_ARRAY_TYPE]
 214 #define string_type_node                c_global_trees[CTI_STRING_TYPE]
 215 #define const_string_type_node          c_global_trees[CTI_CONST_STRING_TYPE]
 216
 217 #define default_function_type           c_global_trees[CTI_DEFAULT_FUNCTION_TYPE]
 218
 219 /* g77 integer types, which which must be kept in sync with f/com.h */
 220 #define g77_integer_type_node           c_global_trees[CTI_G77_INTEGER_TYPE]
 221 #define g77_uinteger_type_node          c_global_trees[CTI_G77_UINTEGER_TYPE]
 222 #define g77_longint_type_node           c_global_trees[CTI_G77_LONGINT_TYPE]
 223 #define g77_ulongint_type_node          c_global_trees[CTI_G77_ULONGINT_TYPE]
 224
 225 #define function_name_decl_node         c_global_trees[CTI_FUNCTION_NAME_DECL]
 226 #define pretty_function_name_decl_node  c_global_trees[CTI_PRETTY_FUNCTION_NAME_DECL]
 227 #define c99_function_name_decl_node             c_global_trees[CTI_C99_FUNCTION_NAME_DECL]
 228 #define saved_function_name_decls       c_global_trees[CTI_SAVED_FUNCTION_NAME_DECLS]
 229
 230 /* A node for `((void) 0)'.  */
 231 #define void_zero_node                  c_global_trees[CTI_VOID_ZERO]
 232
 233 extern tree c_global_trees[CTI_MAX];
 234
 235 /* Mark which labels are explicitly declared.
 236    These may be shadowed, and may be referenced from nested functions.  */
 237 #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label)
 238
 239 /* Flag strings given by __FUNCTION__ and __PRETTY_FUNCTION__ for a
 240    warning if they undergo concatenation.  */
 241 #define C_ARTIFICIAL_STRING_P(NODE) TREE_LANG_FLAG_0 (NODE)
 242
 243 typedef enum c_language_kind
 244 {
 245   clk_c,           /* A dialect of C: K&R C, ANSI/ISO C89, C2000,
 246                        etc.  */
 247   clk_cplusplus,   /* ANSI/ISO C++ */
 248   clk_objective_c  /* Objective C */
 249 }
 250 c_language_kind;
 251
 252 /* Information about a statement tree.  */
 253
 254 struct stmt_tree_s {
 255   /* The last statement added to the tree.  */
 256   tree x_last_stmt;
 257   /* The type of the last expression statement.  (This information is
 258      needed to implement the statement-expression extension.)  */
 259   tree x_last_expr_type;
 260   /* The last filename we recorded.  */
 261   const char *x_last_expr_filename;
 262   /* In C++, Non-zero if we should treat statements as full
 263      expressions.  In particular, this variable is no-zero if at the
 264      end of a statement we should destroy any temporaries created
 265      during that statement.  Similarly, if, at the end of a block, we
 266      should destroy any local variables in this block.  Normally, this
 267      variable is non-zero, since those are the normal semantics of
 268      C++.
 269
 270      However, in order to represent aggregate initialization code as
 271      tree structure, we use statement-expressions.  The statements
 272      within the statement expression should not result in cleanups
 273      being run until the entire enclosing statement is complete.
 274
 275      This flag has no effect in C.  */
 276   int stmts_are_full_exprs_p;
 277 };
 278
 279 typedef struct stmt_tree_s *stmt_tree;
 280
 281 /* Global state pertinent to the current function.  Some C dialects
 282    extend this structure with additional fields.  */
 283
 284 struct language_function {
 285   /* While we are parsing the function, this contains information
 286      about the statement-tree that we are building.  */
 287   struct stmt_tree_s x_stmt_tree;
 288   /* The stack of SCOPE_STMTs for the current function.  */
 289   tree x_scope_stmt_stack;
 290 };
 291
 292 /* When building a statement-tree, this is the last statement added to
 293    the tree.  */
 294
 295 #define last_tree (current_stmt_tree ()->x_last_stmt)
 296
 297 /* The type of the last expression-statement we have seen.  */
 298
 299 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 300
 301 /* The name of the last file we have seen.  */
 302
 303 #define last_expr_filename (current_stmt_tree ()->x_last_expr_filename)
 304
 305 /* LAST_TREE contains the last statement parsed.  These are chained
 306    together through the TREE_CHAIN field, but often need to be
 307    re-organized since the parse is performed bottom-up.  This macro
 308    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 309
 310 #define RECHAIN_STMTS(stmt, substmt)            \
 311   do {                                          \
 312     substmt = TREE_CHAIN (stmt);                \
 313     TREE_CHAIN (stmt) = NULL_TREE;              \
 314     last_tree = stmt;                           \
 315   } while (0)
 316
 317 /* Language-specific hooks.  */
 318
 319 extern int (*lang_statement_code_p)             PARAMS ((enum tree_code));
 320 extern void (*lang_expand_stmt)                 PARAMS ((tree));
 321 extern void (*lang_expand_decl_stmt)            PARAMS ((tree));
 322 extern void (*lang_expand_function_end)         PARAMS ((void));
 323
 324 /* Callback that determines if it's ok for a function to have no
 325    noreturn attribute.  */
 326 extern int (*lang_missing_noreturn_ok_p)        PARAMS ((tree));
 327
 328
 329 extern stmt_tree current_stmt_tree              PARAMS ((void));
 330 extern tree *current_scope_stmt_stack           PARAMS ((void));
 331 extern void begin_stmt_tree                     PARAMS ((tree *));
 332 extern tree add_stmt                            PARAMS ((tree));
 333 extern void add_decl_stmt                       PARAMS ((tree));
 334 extern tree add_scope_stmt                      PARAMS ((int, int));
 335 extern void finish_stmt_tree                    PARAMS ((tree *));
 336
 337 extern int statement_code_p                     PARAMS ((enum tree_code));
 338 extern tree walk_stmt_tree                      PARAMS ((tree *,
 339                                                          walk_tree_fn,
 340                                                          void *));
 341 extern void prep_stmt                           PARAMS ((tree));
 342 extern void expand_stmt                         PARAMS ((tree));
 343 extern void mark_stmt_tree                      PARAMS ((void *));
 344 extern void shadow_warning                      PARAMS ((const char *,
 345                                                          tree, tree));
 346 extern tree c_begin_if_stmt                     PARAMS ((void));
 347 extern tree c_begin_while_stmt                  PARAMS ((void));
 348 extern void c_finish_while_stmt_cond            PARAMS ((tree, tree));
 349
 350
 351 /* Extra information associated with a DECL.  Other C dialects extend
 352    this structure in various ways.  The C front-end only uses this
 353    structure for FUNCTION_DECLs; all other DECLs have a NULL
 354    DECL_LANG_SPECIFIC field.  */
 355
 356 struct c_lang_decl {
 357   unsigned declared_inline : 1;
 358 };
 359
 360 /* In a FUNCTION_DECL for which DECL_BUILT_IN does not hold, this is
 361      the approximate number of statements in this function.  There is
 362      no need for this number to be exact; it is only used in various
 363      heuristics regarding optimization.  */
 364 #define DECL_NUM_STMTS(NODE) \
 365   (FUNCTION_DECL_CHECK (NODE)->decl.u1.i)
 366
 367 extern void c_mark_lang_decl                    PARAMS ((struct c_lang_decl *));
 368
 369 /* The variant of the C language being processed.  Each C language
 370    front-end defines this variable.  */
 371
 372 extern c_language_kind c_language;
 373
 374 /* Nonzero means give string constants the type `const char *', rather
 375    than `char *'.  */
 376
 377 extern int flag_const_strings;
 378
 379 /* Nonzero means give `double' the same size as `float'.  */
 380
 381 extern int flag_short_double;
 382
 383 /* Nonzero means give `wchar_t' the same size as `short'.  */
 384
 385 extern int flag_short_wchar;
 386
 387 /* Warn about *printf or *scanf format/argument anomalies.  */
 388
 389 extern int warn_format;
 390
 391 /* Warn about Y2K problems with strftime formats.  */
 392
 393 extern int warn_format_y2k;
 394
 395 /* Warn about excess arguments to formats.  */
 396
 397 extern int warn_format_extra_args;
 398
 399 /* Warn about non-literal format arguments.  */
 400
 401 extern int warn_format_nonliteral;
 402
 403 /* Warn about possible security problems with calls to format functions.  */
 404
 405 extern int warn_format_security;
 406
 407 /* Warn about possible violations of sequence point rules.  */
 408
 409 extern int warn_sequence_point;
 410
 411 /* Warn about functions which might be candidates for format attributes.  */
 412
 413 extern int warn_missing_format_attribute;
 414
 415 /* Nonzero means warn about sizeof (function) or addition/subtraction
 416    of function pointers.  */
 417
 418 extern int warn_pointer_arith;
 419
 420 /* Nonzero means to warn about compile-time division by zero.  */
 421 extern int warn_div_by_zero;
 422
 423 /* Nonzero means do some things the same way PCC does.  */
 424
 425 extern int flag_traditional;
 426
 427 /* Nonzero means enable C89 Amendment 1 features.  */
 428
 429 extern int flag_isoc94;
 430
 431 /* Nonzero means use the ISO C99 dialect of C.  */
 432
 433 extern int flag_isoc99;
 434
 435 /* Nonzero means environment is hosted (i.e., not freestanding) */
 436
 437 extern int flag_hosted;
 438
 439 /* Nonzero means add default format_arg attributes for functions not
 440    in ISO C.  */
 441
 442 extern int flag_noniso_default_format_attributes;
 443
 444 /* Nonzero means don't recognize any builtin functions.  */
 445
 446 extern int flag_no_builtin;
 447
 448 /* Nonzero means don't recognize the non-ANSI builtin functions.
 449    -ansi sets this.  */
 450
 451 extern int flag_no_nonansi_builtin;
 452
 453 /* Nonzero means warn about suggesting putting in ()'s.  */
 454
 455 extern int warn_parentheses;
 456
 457 /* Warn if a type conversion is done that might have confusing results.  */
 458
 459 extern int warn_conversion;
 460
 461 /* Nonzero means warn about usage of long long,
 462    when `-pedantic' and not C99.  */
 463
 464 extern int warn_long_long;
 465
 466 /* C types are partitioned into three subsets: object, function, and
 467    incomplete types.  */
 468 #define C_TYPE_OBJECT_P(type) \
 469   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 470
 471 #define C_TYPE_INCOMPLETE_P(type) \
 472   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 473
 474 #define C_TYPE_FUNCTION_P(type) \
 475   (TREE_CODE (type) == FUNCTION_TYPE)
 476
 477 /* For convenience we define a single macro to identify the class of
 478    object or incomplete types.  */
 479 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 480   (!C_TYPE_FUNCTION_P (type))
 481
 482 /* Record in each node resulting from a binary operator
 483    what operator was specified for it.  */
 484 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 485
 486 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 487    ID is the identifier to use, NAME is the string.
 488    TYPE_DEP indicates whether it depends on type of the function or not
 489    (i.e. __PRETTY_FUNCTION__).  */
 490
 491 extern tree (*make_fname_decl)                  PARAMS ((tree, int));
 492
 493 extern tree identifier_global_value             PARAMS ((tree));
 494 extern void record_builtin_type                 PARAMS ((enum rid,
 495                                                          const char *, tree));
 496 extern tree build_void_list_node                PARAMS ((void));
 497 extern void start_fname_decls                   PARAMS ((void));
 498 extern void finish_fname_decls                  PARAMS ((void));
 499 extern const char *fname_as_string              PARAMS ((int));
 500 extern tree fname_decl                          PARAMS ((unsigned, tree));
 501 extern const char *fname_string                 PARAMS ((unsigned));
 502
 503 extern void check_function_format               PARAMS ((int *, tree, tree));
 504 extern void set_Wformat                         PARAMS ((int));
 505 extern tree handle_format_attribute             PARAMS ((tree *, tree, tree,
 506                                                          int, bool *));
 507 extern tree handle_format_arg_attribute         PARAMS ((tree *, tree, tree,
 508                                                          int, bool *));
 509 extern void c_common_insert_default_attributes  PARAMS ((tree));
 510 extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
 511 extern tree c_sizeof                            PARAMS ((tree));
 512 extern tree c_alignof                           PARAMS ((tree));
 513 extern tree c_alignof_expr                      PARAMS ((tree));
 514 /* Print an error message for invalid operands to arith operation CODE.
 515    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 516 extern void binary_op_error                     PARAMS ((enum tree_code));
 517 extern tree c_expand_expr_stmt                  PARAMS ((tree));
 518 extern void c_expand_start_cond                 PARAMS ((tree, int, tree));
 519 extern void c_finish_then                       PARAMS ((void));
 520 extern void c_expand_start_else                 PARAMS ((void));
 521 extern void c_finish_else                   PARAMS ((void));
 522 extern void c_expand_end_cond                   PARAMS ((void));
 523 /* Validate the expression after `case' and apply default promotions.  */
 524 extern tree check_case_value                    PARAMS ((tree));
 525 /* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
 526 extern tree combine_strings                     PARAMS ((tree));
 527 extern void constant_expression_warning         PARAMS ((tree));
 528 extern tree convert_and_check                   PARAMS ((tree, tree));
 529 extern void overflow_warning                    PARAMS ((tree));
 530 extern void unsigned_conversion_warning         PARAMS ((tree, tree));
 531
 532 /* Read the rest of the current #-directive line.  */
 533 extern char *get_directive_line                 PARAMS ((void));
 534 #define GET_DIRECTIVE_LINE() get_directive_line ()
 535
 536 /* Subroutine of build_binary_op, used for comparison operations.
 537    See if the operands have both been converted from subword integer types
 538    and, if so, perhaps change them both back to their original type.  */
 539 extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
 540
 541 extern unsigned int min_precision               PARAMS ((tree, int));
 542
 543 /* Add qualifiers to a type, in the fashion for C.  */
 544 extern tree c_build_qualified_type              PARAMS ((tree, int));
 545
 546 /* Build tree nodes and builtin functions common to both C and C++ language
 547    frontends.  */
 548 extern void c_common_nodes_and_builtins         PARAMS ((void));
 549
 550 extern void disable_builtin_function            PARAMS ((const char *));
 551
 552 extern tree build_va_arg                        PARAMS ((tree, tree));
 553
 554 extern void c_common_init_options               PARAMS ((enum c_language_kind));
 555 extern void c_common_post_options               PARAMS ((void));
 556 extern const char *c_common_init                PARAMS ((const char *));
 557 extern void c_common_finish                     PARAMS ((void));
 558 extern HOST_WIDE_INT c_common_get_alias_set     PARAMS ((tree));
 559 extern bool c_promoting_integer_type_p          PARAMS ((tree));
 560 extern int self_promoting_args_p                PARAMS ((tree));
 561 extern tree simple_type_promotes_to             PARAMS ((tree));
 562 extern tree strip_array_types                   PARAMS ((tree));
 563
 564 /* These macros provide convenient access to the various _STMT nodes.  */
 565
 566 /* Nonzero if this statement should be considered a full-expression,
 567    i.e., if temporaries created during this statement should have
 568    their destructors run at the end of this statement.  (In C, this
 569    will always be false, since there are no destructors.)  */
 570 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 571
 572 /* IF_STMT accessors. These give access to the condition of the if
 573    statement, the then block of the if statement, and the else block
 574    of the if statement if it exists.  */
 575 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 576 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 577 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 578
 579 /* WHILE_STMT accessors. These give access to the condition of the
 580    while statement and the body of the while statement, respectively.  */
 581 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 582 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 583
 584 /* DO_STMT accessors. These give access to the condition of the do
 585    statement and the body of the do statement, respectively.  */
 586 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 587 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 588
 589 /* RETURN_STMT accessors. These give the expression associated with a
 590    return statement, and whether it should be ignored when expanding
 591    (as opposed to inlining).  */
 592 #define RETURN_EXPR(NODE)       TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 593
 594 /* EXPR_STMT accessor. This gives the expression associated with an
 595    expression statement.  */
 596 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 597
 598 /* FOR_STMT accessors. These give access to the init statement,
 599    condition, update expression, and body of the for statement,
 600    respectively.  */
 601 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 602 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 603 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 604 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 605
 606 /* SWITCH_STMT accessors. These give access to the condition and body
 607    of the switch statement, respectively.  */
 608 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
 609 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
 610
 611 /* CASE_LABEL accessors. These give access to the high and low values
 612    of a case label, respectively.  */
 613 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
 614 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
 615 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
 616
 617 /* GOTO_STMT accessor. This gives access to the label associated with
 618    a goto statement.  */
 619 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
 620 /* True for goto created artifically by the compiler.  */
 621 #define GOTO_FAKE_P(NODE)       (TREE_LANG_FLAG_0 (GOTO_STMT_CHECK (NODE)))
 622
 623 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
 624    statements associated with a compound statement. The result is the
 625    first statement in the list. Succeeding nodes can be accessed by
 626    calling TREE_CHAIN on a node in the list.  */
 627 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
 628
 629 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
 630    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
 631    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
 632    statement.  */
 633 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
 634 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
 635 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
 636 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
 637 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
 638
 639 /* DECL_STMT accessor. This gives access to the DECL associated with
 640    the given declaration statement.  */
 641 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
 642
 643 /* STMT_EXPR accessor.  */
 644 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 645
 646 /* LABEL_STMT accessor. This gives access to the label associated with
 647    the given label statement.  */
 648 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
 649
 650 /* COMPOUND_LITERAL_EXPR accessors.  */
 651 #define COMPOUND_LITERAL_EXPR_DECL_STMT(NODE)           \
 652   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 653 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                        \
 654   DECL_STMT_DECL (COMPOUND_LITERAL_EXPR_DECL_STMT (NODE))
 655
 656 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
 657 #define SCOPE_BEGIN_P(NODE) \
 658   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
 659
 660 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
 661 #define SCOPE_END_P(NODE) \
 662   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
 663
 664 /* The BLOCK containing the declarations contained in this scope.  */
 665 #define SCOPE_STMT_BLOCK(NODE) \
 666   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
 667
 668 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
 669 #define SCOPE_NULLIFIED_P(NODE) \
 670   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
 671
 672 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
 673    which should be treated as non-existent from the point of view of
 674    running cleanup actions.  */
 675 #define SCOPE_NO_CLEANUPS_P(NODE) \
 676   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
 677
 678 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
 679    For example, in:
 680
 681      S s;
 682      l:
 683      S s2;
 684      goto l;
 685
 686    there is (implicitly) a new scope after `l', even though there are
 687    no curly braces.  In particular, when we hit the goto, we must
 688    destroy s2 and then re-construct it.  For the implicit scope,
 689    SCOPE_PARTIAL_P will be set.  */
 690 #define SCOPE_PARTIAL_P(NODE) \
 691   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
 692
 693 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
 694 #define ASM_VOLATILE_P(NODE)                    \
 695   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
 696
 697 /* The filename we are changing to as of this FILE_STMT.  */
 698 #define FILE_STMT_FILENAME_NODE(NODE) \
 699   (TREE_OPERAND (FILE_STMT_CHECK (NODE), 0))
 700 #define FILE_STMT_FILENAME(NODE) \
 701   (IDENTIFIER_POINTER (FILE_STMT_FILENAME_NODE (NODE)))
 702
 703 /* The line-number at which a statement began.  But if
 704    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
 705    line number for the end of the current function instead.  */
 706 #define STMT_LINENO(NODE)                       \
 707   (TREE_COMPLEXITY ((NODE)))
 708
 709 /* If non-zero, the STMT_LINENO for NODE is the line at which the
 710    function ended.  */
 711 #define STMT_LINENO_FOR_FN_P(NODE)              \
 712   (TREE_LANG_FLAG_2 ((NODE)))
 713
 714 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 715    initialization variables.  */
 716 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 717
 718 /* Nonzero if we want to create an ASM_INPUT instead of an
 719    ASM_OPERAND with no operands.  */
 720 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 721
 722 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 723
 724 enum c_tree_code {
 725   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 726 #include "c-common.def"
 727   LAST_C_TREE_CODE
 728 };
 729
 730 #undef DEFTREECODE
 731
 732 extern void add_c_tree_codes                    PARAMS ((void));
 733 extern void genrtl_do_pushlevel                 PARAMS ((void));
 734 extern void genrtl_goto_stmt                    PARAMS ((tree));
 735 extern void genrtl_expr_stmt                    PARAMS ((tree));
 736 extern void genrtl_expr_stmt_value              PARAMS ((tree, int, int));
 737 extern void genrtl_decl_stmt                    PARAMS ((tree));
 738 extern void genrtl_if_stmt                      PARAMS ((tree));
 739 extern void genrtl_while_stmt                   PARAMS ((tree));
 740 extern void genrtl_do_stmt                      PARAMS ((tree));
 741 extern void genrtl_return_stmt                  PARAMS ((tree));
 742 extern void genrtl_for_stmt                     PARAMS ((tree));
 743 extern void genrtl_break_stmt                   PARAMS ((void));
 744 extern void genrtl_continue_stmt                PARAMS ((void));
 745 extern void genrtl_scope_stmt                   PARAMS ((tree));
 746 extern void genrtl_switch_stmt                  PARAMS ((tree));
 747 extern void genrtl_case_label                   PARAMS ((tree));
 748 extern void genrtl_compound_stmt                PARAMS ((tree));
 749 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
 750                                                          tree, tree,
 751                                                          tree, int));
 752 extern void genrtl_decl_cleanup                 PARAMS ((tree, tree));
 753 extern int stmts_are_full_exprs_p               PARAMS ((void));
 754 extern int anon_aggr_type_p                     PARAMS ((tree));
 755
 756 /* For a VAR_DECL that is an anonymous union, these are the various
 757    sub-variables that make up the anonymous union.  */
 758 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 759
 760 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 761 #define DECL_C_BIT_FIELD(NODE) \
 762   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 763 #define SET_DECL_C_BIT_FIELD(NODE) \
 764   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 765 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 766   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 767
 768 /* In a VAR_DECL, nonzero if the decl is a register variable with
 769    an explicit asm specification.  */
 770 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
 771
 772 extern void emit_local_var                      PARAMS ((tree));
 773 extern void make_rtl_for_local_static           PARAMS ((tree));
 774 extern tree expand_cond                         PARAMS ((tree));
 775 extern tree c_expand_return                     PARAMS ((tree));
 776 extern tree do_case                             PARAMS ((tree, tree));
 777 extern tree build_stmt                          PARAMS ((enum tree_code, ...));
 778 extern tree build_case_label                    PARAMS ((tree, tree, tree));
 779 extern tree build_continue_stmt                 PARAMS ((void));
 780 extern tree build_break_stmt                    PARAMS ((void));
 781 extern tree build_return_stmt                   PARAMS ((tree));
 782
 783 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
 784
 785 /* Used by the C++ frontend to mark the block around the member
 786    initializers and cleanups.  */
 787 #define COMPOUND_STMT_BODY_BLOCK(NODE)  TREE_LANG_FLAG_3 (NODE)
 788
 789 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
 790
 791 /* These functions must be defined by each front-end which implements
 792    a variant of the C language.  They are used in c-common.c.  */
 793
 794 extern tree build_unary_op                      PARAMS ((enum tree_code,
 795                                                          tree, int));
 796 extern tree build_binary_op                     PARAMS ((enum tree_code,
 797                                                          tree, tree, int));
 798 extern int lvalue_p                             PARAMS ((tree));
 799 extern tree default_conversion                  PARAMS ((tree));
 800
 801 /* Given two integer or real types, return the type for their sum.
 802    Given two compatible ANSI C types, returns the merged type.  */
 803
 804 extern tree common_type                         PARAMS ((tree, tree));
 805
 806 extern tree expand_tree_builtin                 PARAMS ((tree, tree, tree));
 807
 808 extern tree decl_constant_value         PARAMS ((tree));
 809
 810 /* Handle increment and decrement of boolean types.  */
 811 extern tree boolean_increment                   PARAMS ((enum tree_code,
 812                                                          tree));
 813
 814 /* Hook currently used only by the C++ front end to reset internal state
 815    after entering or leaving a header file.  */
 816 extern void extract_interface_info              PARAMS ((void));
 817
 818 extern void mark_c_language_function            PARAMS ((struct language_function *));
 819
 820 extern int case_compare                         PARAMS ((splay_tree_key,
 821                                                          splay_tree_key));
 822
 823 extern tree c_add_case_label                    PARAMS ((splay_tree,
 824                                                          tree, tree,
 825                                                          tree));
 826
 827 extern tree build_function_call                 PARAMS ((tree, tree));
 828
 829 extern tree finish_label_address_expr           PARAMS ((tree));
 830
 831 /* Same function prototype, but the C and C++ front ends have
 832    different implementations.  Used in c-common.c.  */
 833 extern tree lookup_label                        PARAMS ((tree));
 834
 835 /* enum expand_modified is in expr.h, as is the macro below.  */
 836
 837 #ifdef QUEUED_VAR
 838 extern rtx c_expand_expr            PARAMS ((tree, rtx, enum machine_mode,
 839                                              enum expand_modifier));
 840 #endif
 841
 842 extern int c_safe_from_p                        PARAMS ((rtx, tree));
 843
 844 extern int c_staticp                            PARAMS ((tree));
 845
 846 extern int c_unsafe_for_reeval                  PARAMS ((tree));
 847
 848 /* Information recorded about each file examined during compilation.  */
 849
 850 struct c_fileinfo
 851 {
 852   int time;     /* Time spent in the file.  */
 853   short interface_only;         /* Flags - used only by C++ */
 854   short interface_unknown;
 855 };
 856
 857 struct c_fileinfo *get_fileinfo                 PARAMS ((const char *));
 858 extern void dump_time_statistics                PARAMS ((void));
 859
 860 #endif /* ! GCC_C_COMMON_H */