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))->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   ENUM_BITFIELD(rid) rid_code: CHAR_BIT;
 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 typedef enum c_language_kind
 240 {
 241   clk_c,           /* A dialect of C: K&R C, ANSI/ISO C89, C2000,
 242                        etc.  */
 243   clk_cplusplus,   /* ANSI/ISO C++ */
 244   clk_objective_c  /* Objective C */
 245 }
 246 c_language_kind;
 247
 248 /* Information about a statement tree.  */
 249
 250 struct stmt_tree_s {
 251   /* The last statement added to the tree.  */
 252   tree x_last_stmt;
 253   /* The type of the last expression statement.  (This information is
 254      needed to implement the statement-expression extension.)  */
 255   tree x_last_expr_type;
 256   /* In C++, Non-zero if we should treat statements as full
 257      expressions.  In particular, this variable is no-zero if at the
 258      end of a statement we should destroy any temporaries created
 259      during that statement.  Similarly, if, at the end of a block, we
 260      should destroy any local variables in this block.  Normally, this
 261      variable is non-zero, since those are the normal semantics of
 262      C++.
 263
 264      However, in order to represent aggregate initialization code as
 265      tree structure, we use statement-expressions.  The statements
 266      within the statement expression should not result in cleanups
 267      being run until the entire enclosing statement is complete.
 268
 269      This flag has no effect in C.  */
 270   int stmts_are_full_exprs_p;
 271 };
 272
 273 typedef struct stmt_tree_s *stmt_tree;
 274
 275 /* Global state pertinent to the current function.  Some C dialects
 276    extend this structure with additional fields.  */
 277
 278 struct language_function {
 279   /* While we are parsing the function, this contains information
 280      about the statement-tree that we are building.  */
 281   struct stmt_tree_s x_stmt_tree;
 282   /* The stack of SCOPE_STMTs for the current function.  */
 283   tree x_scope_stmt_stack;
 284 };
 285
 286 /* When building a statement-tree, this is the last statement added to
 287    the tree.  */
 288
 289 #define last_tree (current_stmt_tree ()->x_last_stmt)
 290
 291 /* The type of the last expression-statement we have seen.  */
 292
 293 #define last_expr_type (current_stmt_tree ()->x_last_expr_type)
 294
 295 /* LAST_TREE contains the last statement parsed.  These are chained
 296    together through the TREE_CHAIN field, but often need to be
 297    re-organized since the parse is performed bottom-up.  This macro
 298    makes LAST_TREE the indicated SUBSTMT of STMT.  */
 299
 300 #define RECHAIN_STMTS(stmt, substmt)            \
 301   do {                                          \
 302     substmt = TREE_CHAIN (stmt);                \
 303     TREE_CHAIN (stmt) = NULL_TREE;              \
 304     last_tree = stmt;                           \
 305   } while (0)
 306
 307 /* Language-specific hooks.  */
 308
 309 extern int (*lang_statement_code_p)             PARAMS ((enum tree_code));
 310 extern void (*lang_expand_stmt)                 PARAMS ((tree));
 311 extern void (*lang_expand_decl_stmt)            PARAMS ((tree));
 312 extern void (*lang_expand_function_end)         PARAMS ((void));
 313
 314 /* Callback that determines if it's ok for a function to have no
 315    noreturn attribute.  */
 316 extern int (*lang_missing_noreturn_ok_p)        PARAMS ((tree));
 317
 318
 319 extern stmt_tree current_stmt_tree              PARAMS ((void));
 320 extern tree *current_scope_stmt_stack           PARAMS ((void));
 321 extern void begin_stmt_tree                     PARAMS ((tree *));
 322 extern tree add_stmt                            PARAMS ((tree));
 323 extern void add_decl_stmt                       PARAMS ((tree));
 324 extern tree add_scope_stmt                      PARAMS ((int, int));
 325 extern void finish_stmt_tree                    PARAMS ((tree *));
 326
 327 extern int statement_code_p                     PARAMS ((enum tree_code));
 328 extern tree walk_stmt_tree                      PARAMS ((tree *,
 329                                                          walk_tree_fn,
 330                                                          void *));
 331 extern void prep_stmt                           PARAMS ((tree));
 332 extern void expand_stmt                         PARAMS ((tree));
 333 extern void mark_stmt_tree                      PARAMS ((void *));
 334
 335 /* Extra information associated with a DECL.  Other C dialects extend
 336    this structure in various ways.  The C front-end only uses this
 337    structure for FUNCTION_DECLs; all other DECLs have a NULL
 338    DECL_LANG_SPECIFIC field.  */
 339
 340 struct c_lang_decl {
 341   unsigned declared_inline : 1;
 342 };
 343
 344 /* In a FUNCTION_DECL for which DECL_BUILT_IN does not hold, this is
 345      the approximate number of statements in this function.  There is
 346      no need for this number to be exact; it is only used in various
 347      heuristics regarding optimization.  */
 348 #define DECL_NUM_STMTS(NODE) \
 349   (FUNCTION_DECL_CHECK (NODE)->decl.u1.i)
 350
 351 extern void c_mark_lang_decl                    PARAMS ((struct c_lang_decl *));
 352
 353 /* The variant of the C language being processed.  Each C language
 354    front-end defines this variable.  */
 355
 356 extern c_language_kind c_language;
 357
 358 /* Nonzero means give string constants the type `const char *', rather
 359    than `char *'.  */
 360
 361 extern int flag_const_strings;
 362
 363 /* Nonzero means give `double' the same size as `float'.  */
 364
 365 extern int flag_short_double;
 366
 367 /* Nonzero means give `wchar_t' the same size as `short'.  */
 368
 369 extern int flag_short_wchar;
 370
 371 /* Warn about *printf or *scanf format/argument anomalies.  */
 372
 373 extern int warn_format;
 374
 375 /* Warn about Y2K problems with strftime formats.  */
 376
 377 extern int warn_format_y2k;
 378
 379 /* Warn about excess arguments to formats.  */
 380
 381 extern int warn_format_extra_args;
 382
 383 /* Warn about non-literal format arguments.  */
 384
 385 extern int warn_format_nonliteral;
 386
 387 /* Warn about possible security problems with calls to format functions.  */
 388
 389 extern int warn_format_security;
 390
 391 /* Warn about possible violations of sequence point rules.  */
 392
 393 extern int warn_sequence_point;
 394
 395 /* Warn about functions which might be candidates for format attributes.  */
 396
 397 extern int warn_missing_format_attribute;
 398
 399 /* Nonzero means warn about sizeof (function) or addition/subtraction
 400    of function pointers.  */
 401
 402 extern int warn_pointer_arith;
 403
 404 /* Nonzero means do some things the same way PCC does.  */
 405
 406 extern int flag_traditional;
 407
 408 /* Nonzero means enable C89 Amendment 1 features.  */
 409
 410 extern int flag_isoc94;
 411
 412 /* Nonzero means use the ISO C99 dialect of C.  */
 413
 414 extern int flag_isoc99;
 415
 416 /* Nonzero means environment is hosted (i.e., not freestanding) */
 417
 418 extern int flag_hosted;
 419
 420 /* Nonzero means add default format_arg attributes for functions not
 421    in ISO C.  */
 422
 423 extern int flag_noniso_default_format_attributes;
 424
 425 /* Nonzero means don't recognize any builtin functions.  */
 426
 427 extern int flag_no_builtin;
 428
 429 /* Nonzero means don't recognize the non-ANSI builtin functions.
 430    -ansi sets this.  */
 431
 432 extern int flag_no_nonansi_builtin;
 433
 434 /* Nonzero means warn about suggesting putting in ()'s.  */
 435
 436 extern int warn_parentheses;
 437
 438 /* Warn if a type conversion is done that might have confusing results.  */
 439
 440 extern int warn_conversion;
 441
 442 /* Nonzero means warn about usage of long long,
 443    when `-pedantic' and not C99.  */
 444
 445 extern int warn_long_long;
 446
 447 /* C types are partitioned into three subsets: object, function, and
 448    incomplete types.  */
 449 #define C_TYPE_OBJECT_P(type) \
 450   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 451
 452 #define C_TYPE_INCOMPLETE_P(type) \
 453   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 454
 455 #define C_TYPE_FUNCTION_P(type) \
 456   (TREE_CODE (type) == FUNCTION_TYPE)
 457
 458 /* Return the qualifiers that apply to this type.  In C++, that means
 459    descending through array types.  Note that this macro evaluates its
 460    arguments mor than once.  */
 461 #define C_TYPE_QUALS(TYPE)                              \
 462   (TYPE_QUALS ((TREE_CODE (TYPE) == ARRAY_TYPE          \
 463                 && c_language == clk_cplusplus)         \
 464                ? strip_array_types (TYPE) : TYPE))
 465
 466 /* For convenience we define a single macro to identify the class of
 467    object or incomplete types.  */
 468 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 469   (!C_TYPE_FUNCTION_P (type))
 470
 471 /* Record in each node resulting from a binary operator
 472    what operator was specified for it.  */
 473 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 474
 475 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 476    ID is the identifier to use, NAME is the string.
 477    TYPE_DEP indicates whether it depends on type of the function or not
 478    (i.e. __PRETTY_FUNCTION__).  */
 479
 480 extern tree (*make_fname_decl)                  PARAMS ((tree, int));
 481
 482 extern tree identifier_global_value             PARAMS ((tree));
 483 extern void record_builtin_type                 PARAMS ((enum rid,
 484                                                          const char *, tree));
 485 extern tree build_void_list_node                PARAMS ((void));
 486 extern void start_fname_decls                   PARAMS ((void));
 487 extern void finish_fname_decls                  PARAMS ((void));
 488 extern const char *fname_as_string              PARAMS ((int));
 489 extern tree fname_decl                          PARAMS ((unsigned, tree));
 490 extern const char *fname_string                 PARAMS ((unsigned));
 491
 492 extern void check_function_format               PARAMS ((int *, tree, tree));
 493 extern void set_Wformat                         PARAMS ((int));
 494 extern tree handle_format_attribute             PARAMS ((tree *, tree, tree,
 495                                                          int, bool *));
 496 extern tree handle_format_arg_attribute         PARAMS ((tree *, tree, tree,
 497                                                          int, bool *));
 498 extern void c_common_insert_default_attributes  PARAMS ((tree));
 499 extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
 500 extern tree c_sizeof                            PARAMS ((tree));
 501 extern tree c_alignof                           PARAMS ((tree));
 502 extern tree c_alignof_expr                      PARAMS ((tree));
 503 /* Print an error message for invalid operands to arith operation CODE.
 504    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 505 extern void binary_op_error                     PARAMS ((enum tree_code));
 506 extern tree c_expand_expr_stmt                  PARAMS ((tree));
 507 extern void c_expand_start_cond                 PARAMS ((tree, int));
 508 extern void c_finish_then                       PARAMS ((void));
 509 extern void c_expand_start_else                 PARAMS ((void));
 510 extern void c_finish_else                   PARAMS ((void));
 511 extern void c_expand_end_cond                   PARAMS ((void));
 512 /* Validate the expression after `case' and apply default promotions.  */
 513 extern tree check_case_value                    PARAMS ((tree));
 514 /* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
 515 extern tree combine_strings                     PARAMS ((tree));
 516 extern void constant_expression_warning         PARAMS ((tree));
 517 extern tree convert_and_check                   PARAMS ((tree, tree));
 518 extern void overflow_warning                    PARAMS ((tree));
 519 extern void unsigned_conversion_warning         PARAMS ((tree, tree));
 520
 521 /* Read the rest of the current #-directive line.  */
 522 extern char *get_directive_line                 PARAMS ((void));
 523 #define GET_DIRECTIVE_LINE() get_directive_line ()
 524
 525 /* Subroutine of build_binary_op, used for comparison operations.
 526    See if the operands have both been converted from subword integer types
 527    and, if so, perhaps change them both back to their original type.  */
 528 extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
 529
 530 extern unsigned int min_precision               PARAMS ((tree, int));
 531
 532 /* Add qualifiers to a type, in the fashion for C.  */
 533 extern tree c_build_qualified_type              PARAMS ((tree, int));
 534
 535 /* Build tree nodes and builtin functions common to both C and C++ language
 536    frontends.  */
 537 extern void c_common_nodes_and_builtins         PARAMS ((void));
 538
 539 extern tree build_va_arg                        PARAMS ((tree, tree));
 540
 541 extern void c_common_lang_init                  PARAMS ((void));
 542
 543 extern bool c_promoting_integer_type_p          PARAMS ((tree));
 544 extern int self_promoting_args_p                PARAMS ((tree));
 545 extern tree simple_type_promotes_to             PARAMS ((tree));
 546 extern tree strip_array_types                   PARAMS ((tree));
 547
 548 /* These macros provide convenient access to the various _STMT nodes.  */
 549
 550 /* Nonzero if this statement should be considered a full-expression,
 551    i.e., if temporaries created during this statement should have
 552    their destructors run at the end of this statement.  (In C, this
 553    will always be false, since there are no destructors.)  */
 554 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 555
 556 /* IF_STMT accessors. These give access to the condtion of the if
 557    statement, the then block of the if statement, and the else block
 558    of the if stsatement if it exists.  */
 559 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 560 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 561 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 562
 563 /* WHILE_STMT accessors. These give access to the condtion of the
 564    while statement and the body of the while statement, respectively.  */
 565 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 566 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 567
 568 /* DO_STMT accessors. These give access to the condition of the do
 569    statement and the body of the do statement, respectively.  */
 570 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 571 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 572
 573 /* RETURN_STMT accessors. These give the expression associated with a
 574    return statement, and whether it should be ignored when expanding
 575    (as opposed to inlining).  */
 576 #define RETURN_EXPR(NODE)       TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 577
 578 /* EXPR_STMT accessor. This gives the expression associated with an
 579    expression statement.  */
 580 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 581
 582 /* FOR_STMT accessors. These give access to the init statement,
 583    condition, update expression, and body of the for statement,
 584    respectively.  */
 585 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 586 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 587 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 588 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 589
 590 /* SWITCH_STMT accessors. These give access to the condition and body
 591    of the switch statement, respectively.  */
 592 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
 593 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
 594
 595 /* CASE_LABEL accessors. These give access to the high and low values
 596    of a case label, respectively.  */
 597 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
 598 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
 599 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
 600
 601 /* GOTO_STMT accessor. This gives access to the label associated with
 602    a goto statement.  */
 603 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
 604
 605 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
 606    statements assocated with a compound statement. The result is the
 607    first statement in the list. Succeeding nodes can be acccessed by
 608    calling TREE_CHAIN on a node in the list.  */
 609 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
 610
 611 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
 612    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
 613    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
 614    statement.  */
 615 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
 616 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
 617 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
 618 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
 619 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
 620
 621 /* DECL_STMT accessor. This gives access to the DECL associated with
 622    the given declaration statement.  */
 623 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
 624
 625 /* STMT_EXPR accessor.  */
 626 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 627
 628 /* LABEL_STMT accessor. This gives access to the label associated with
 629    the given label statement.  */
 630 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
 631
 632 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
 633 #define SCOPE_BEGIN_P(NODE) \
 634   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
 635
 636 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
 637 #define SCOPE_END_P(NODE) \
 638   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
 639
 640 /* The BLOCK containing the declarations contained in this scope.  */
 641 #define SCOPE_STMT_BLOCK(NODE) \
 642   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
 643
 644 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
 645 #define SCOPE_NULLIFIED_P(NODE) \
 646   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
 647
 648 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
 649    which should be treated as non-existant from the point of view of
 650    running cleanup actions.  */
 651 #define SCOPE_NO_CLEANUPS_P(NODE) \
 652   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
 653
 654 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
 655    For example, in:
 656
 657      S s;
 658      l:
 659      S s2;
 660      goto l;
 661
 662    there is (implicitly) a new scope after `l', even though there are
 663    no curly braces.  In particular, when we hit the goto, we must
 664    destroy s2 and then re-construct it.  For the implicit scope,
 665    SCOPE_PARTIAL_P will be set.  */
 666 #define SCOPE_PARTIAL_P(NODE) \
 667   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
 668
 669 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
 670 #define ASM_VOLATILE_P(NODE)                    \
 671   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
 672
 673 /* The line-number at which a statement began.  But if
 674    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
 675    line number for the end of the current function instead.  */
 676 #define STMT_LINENO(NODE)                       \
 677   (TREE_COMPLEXITY ((NODE)))
 678
 679 /* If non-zero, the STMT_LINENO for NODE is the line at which the
 680    function ended.  */
 681 #define STMT_LINENO_FOR_FN_P(NODE)              \
 682   (TREE_LANG_FLAG_2 ((NODE)))
 683
 684 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 685    initialization variables.  */
 686 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 687
 688 /* Nonzero if we want to create an ASM_INPUT instead of an
 689    ASM_OPERAND with no operands.  */
 690 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 691
 692 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 693
 694 enum c_tree_code {
 695   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 696 #include "c-common.def"
 697   LAST_C_TREE_CODE
 698 };
 699
 700 #undef DEFTREECODE
 701
 702 extern void add_c_tree_codes                    PARAMS ((void));
 703 extern void genrtl_do_pushlevel                 PARAMS ((void));
 704 extern void genrtl_goto_stmt                    PARAMS ((tree));
 705 extern void genrtl_expr_stmt                    PARAMS ((tree));
 706 extern void genrtl_decl_stmt                    PARAMS ((tree));
 707 extern void genrtl_if_stmt                      PARAMS ((tree));
 708 extern void genrtl_while_stmt                   PARAMS ((tree));
 709 extern void genrtl_do_stmt                      PARAMS ((tree));
 710 extern void genrtl_return_stmt                  PARAMS ((tree));
 711 extern void genrtl_for_stmt                     PARAMS ((tree));
 712 extern void genrtl_break_stmt                   PARAMS ((void));
 713 extern void genrtl_continue_stmt                PARAMS ((void));
 714 extern void genrtl_scope_stmt                   PARAMS ((tree));
 715 extern void genrtl_switch_stmt                  PARAMS ((tree));
 716 extern void genrtl_case_label                   PARAMS ((tree));
 717 extern void genrtl_compound_stmt                PARAMS ((tree));
 718 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
 719                                                          tree, tree,
 720                                                          tree, int));
 721 extern void genrtl_decl_cleanup                 PARAMS ((tree, tree));
 722 extern int stmts_are_full_exprs_p               PARAMS ((void));
 723 extern int anon_aggr_type_p                     PARAMS ((tree));
 724
 725 /* For a VAR_DECL that is an anonymous union, these are the various
 726    sub-variables that make up the anonymous union.  */
 727 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 728
 729 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 730 #define DECL_C_BIT_FIELD(NODE) \
 731   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 732 #define SET_DECL_C_BIT_FIELD(NODE) \
 733   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 734 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 735   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 736
 737 /* In a VAR_DECL, nonzero if the decl is a register variable with
 738    an explicit asm specification.  */
 739 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
 740
 741 extern void emit_local_var                      PARAMS ((tree));
 742 extern void make_rtl_for_local_static           PARAMS ((tree));
 743 extern tree expand_cond                         PARAMS ((tree));
 744 extern tree c_expand_return                     PARAMS ((tree));
 745 extern tree do_case                             PARAMS ((tree, tree));
 746 extern tree build_stmt                          PARAMS ((enum tree_code, ...));
 747 extern tree build_case_label                    PARAMS ((tree, tree, tree));
 748 extern tree build_continue_stmt                 PARAMS ((void));
 749 extern tree build_break_stmt                    PARAMS ((void));
 750 extern tree build_return_stmt                   PARAMS ((tree));
 751
 752 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
 753
 754 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
 755
 756 /* These functions must be defined by each front-end which implements
 757    a variant of the C language.  They are used in c-common.c.  */
 758
 759 extern tree build_unary_op                      PARAMS ((enum tree_code,
 760                                                          tree, int));
 761 extern tree build_binary_op                     PARAMS ((enum tree_code,
 762                                                          tree, tree, int));
 763 extern int lvalue_p                             PARAMS ((tree));
 764 extern tree default_conversion                  PARAMS ((tree));
 765
 766 /* Given two integer or real types, return the type for their sum.
 767    Given two compatible ANSI C types, returns the merged type.  */
 768
 769 extern tree common_type                         PARAMS ((tree, tree));
 770
 771 extern tree expand_tree_builtin                 PARAMS ((tree, tree, tree));
 772
 773 extern tree decl_constant_value         PARAMS ((tree));
 774
 775 /* Handle increment and decrement of boolean types.  */
 776 extern tree boolean_increment                   PARAMS ((enum tree_code,
 777                                                          tree));
 778
 779 /* Hook currently used only by the C++ front end to reset internal state
 780    after entering or leaving a header file.  */
 781 extern void extract_interface_info              PARAMS ((void));
 782
 783 extern void mark_c_language_function            PARAMS ((struct language_function *));
 784
 785 extern int case_compare                         PARAMS ((splay_tree_key,
 786                                                          splay_tree_key));
 787
 788 extern tree c_add_case_label                    PARAMS ((splay_tree,
 789                                                          tree, tree,
 790                                                          tree));
 791
 792 extern tree build_function_call                 PARAMS ((tree, tree));
 793
 794 extern tree finish_label_address_expr           PARAMS ((tree));
 795
 796 /* Same function prototype, but the C and C++ front ends have
 797    different implementations.  Used in c-common.c.  */
 798 extern tree lookup_label                        PARAMS ((tree));
 799
 800 /* If this variable is defined to a non-NULL value, it will be called
 801    after the file has been completely parsed.  The argument will be
 802    the GLOBAL_NAMESPACE in C++, or the list of top-level declarations
 803    in C.  */
 804 extern void (*back_end_hook) PARAMS ((tree));
 805
 806 #ifdef RTX_CODE
 807
 808 extern struct rtx_def *c_expand_expr            PARAMS ((tree, rtx,
 809                                                          enum machine_mode,
 810                                                          enum expand_modifier));
 811
 812 extern int c_safe_from_p                        PARAMS ((rtx, tree));
 813 #endif
 814
 815 extern int c_unsafe_for_reeval                  PARAMS ((tree));
 816
 817 /* In c-dump.c */
 818
 819 /* Different tree dump places.  When you add new tree dump places,
 820    extend the DUMP_FILES array in c-dump.c */
 821 enum tree_dump_index
 822 {
 823   TDI_all,                      /* dump the whole translation unit */
 824   TDI_class,                    /* dump class heirarchy */
 825   TDI_original,                 /* dump each function before optimizing it */
 826   TDI_optimized,                /* dump each function after optimizing it */
 827   TDI_inlined,                  /* dump each function after inlining
 828                                    within it.  */
 829   TDI_end
 830 };
 831
 832 /* Bit masks to control tree dumping. Not all values are applicable to
 833    all tree dumps. Add new ones at the end. When you define new
 834    values, extend the DUMP_OPTIONS array in c-dump.c */
 835 #define TDF_ADDRESS     (1 << 0)        /* dump node addresses */
 836 #define TDF_SLIM        (1 << 1)        /* don't go wild following links */
 837
 838 typedef struct dump_info *dump_info_p;
 839
 840 /* A callback function used dump language-specific parts of tree
 841    nodes.  Returns non-zero if it does not want the usual dumping of
 842    the second argument.  */
 843
 844 typedef int (*dump_tree_fn) PARAMS ((dump_info_p, tree));
 845
 846 extern dump_tree_fn lang_dump_tree;
 847
 848 extern int dump_flag                    PARAMS ((dump_info_p, int, tree));
 849 extern int dump_enabled_p               PARAMS ((enum tree_dump_index));
 850 extern FILE *dump_begin                 PARAMS ((enum tree_dump_index, int *));
 851 extern void dump_end                    PARAMS ((enum tree_dump_index, FILE *));
 852 extern void dump_node                   PARAMS ((tree, int, FILE *));
 853 extern int dump_switch_p                PARAMS ((const char *));
 854 extern const char *dump_flag_name       PARAMS ((enum tree_dump_index));
 855
 856 /* Information recorded about each file examined during compilation.  */
 857
 858 struct c_fileinfo
 859 {
 860   int time;     /* Time spent in the file.  */
 861   short interface_only;         /* Flags - used only by C++ */
 862   short interface_unknown;
 863 };
 864
 865 struct c_fileinfo *get_fileinfo                 PARAMS ((const char *));
 866 extern void dump_time_statistics                PARAMS ((void));
 867
 868 #endif /* ! GCC_C_COMMON_H */