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, RID_CHOOSE_EXPR, RID_TYPES_COMPATIBLE_P,
  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 extern void shadow_warning                      PARAMS ((const char *,
 334                                                          tree, tree));
 335
 336 /* Extra information associated with a DECL.  Other C dialects extend
 337    this structure in various ways.  The C front-end only uses this
 338    structure for FUNCTION_DECLs; all other DECLs have a NULL
 339    DECL_LANG_SPECIFIC field.  */
 340
 341 struct c_lang_decl {
 342   unsigned declared_inline : 1;
 343 };
 344
 345 /* In a FUNCTION_DECL for which DECL_BUILT_IN does not hold, this is
 346      the approximate number of statements in this function.  There is
 347      no need for this number to be exact; it is only used in various
 348      heuristics regarding optimization.  */
 349 #define DECL_NUM_STMTS(NODE) \
 350   (FUNCTION_DECL_CHECK (NODE)->decl.u1.i)
 351
 352 extern void c_mark_lang_decl                    PARAMS ((struct c_lang_decl *));
 353
 354 /* The variant of the C language being processed.  Each C language
 355    front-end defines this variable.  */
 356
 357 extern c_language_kind c_language;
 358
 359 /* Nonzero means give string constants the type `const char *', rather
 360    than `char *'.  */
 361
 362 extern int flag_const_strings;
 363
 364 /* Nonzero means give `double' the same size as `float'.  */
 365
 366 extern int flag_short_double;
 367
 368 /* Nonzero means give `wchar_t' the same size as `short'.  */
 369
 370 extern int flag_short_wchar;
 371
 372 /* Warn about *printf or *scanf format/argument anomalies.  */
 373
 374 extern int warn_format;
 375
 376 /* Warn about Y2K problems with strftime formats.  */
 377
 378 extern int warn_format_y2k;
 379
 380 /* Warn about excess arguments to formats.  */
 381
 382 extern int warn_format_extra_args;
 383
 384 /* Warn about non-literal format arguments.  */
 385
 386 extern int warn_format_nonliteral;
 387
 388 /* Warn about possible security problems with calls to format functions.  */
 389
 390 extern int warn_format_security;
 391
 392 /* Warn about possible violations of sequence point rules.  */
 393
 394 extern int warn_sequence_point;
 395
 396 /* Warn about functions which might be candidates for format attributes.  */
 397
 398 extern int warn_missing_format_attribute;
 399
 400 /* Nonzero means warn about sizeof (function) or addition/subtraction
 401    of function pointers.  */
 402
 403 extern int warn_pointer_arith;
 404
 405 /* Nonzero means to warn about compile-time division by zero.  */
 406 extern int warn_div_by_zero;
 407
 408 /* Nonzero means do some things the same way PCC does.  */
 409
 410 extern int flag_traditional;
 411
 412 /* Nonzero means enable C89 Amendment 1 features.  */
 413
 414 extern int flag_isoc94;
 415
 416 /* Nonzero means use the ISO C99 dialect of C.  */
 417
 418 extern int flag_isoc99;
 419
 420 /* Nonzero means environment is hosted (i.e., not freestanding) */
 421
 422 extern int flag_hosted;
 423
 424 /* Nonzero means add default format_arg attributes for functions not
 425    in ISO C.  */
 426
 427 extern int flag_noniso_default_format_attributes;
 428
 429 /* Nonzero means don't recognize any builtin functions.  */
 430
 431 extern int flag_no_builtin;
 432
 433 /* Nonzero means don't recognize the non-ANSI builtin functions.
 434    -ansi sets this.  */
 435
 436 extern int flag_no_nonansi_builtin;
 437
 438 /* Nonzero means warn about suggesting putting in ()'s.  */
 439
 440 extern int warn_parentheses;
 441
 442 /* Warn if a type conversion is done that might have confusing results.  */
 443
 444 extern int warn_conversion;
 445
 446 /* Nonzero means warn about usage of long long,
 447    when `-pedantic' and not C99.  */
 448
 449 extern int warn_long_long;
 450
 451 /* C types are partitioned into three subsets: object, function, and
 452    incomplete types.  */
 453 #define C_TYPE_OBJECT_P(type) \
 454   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type))
 455
 456 #define C_TYPE_INCOMPLETE_P(type) \
 457   (TREE_CODE (type) != FUNCTION_TYPE && TYPE_SIZE (type) == 0)
 458
 459 #define C_TYPE_FUNCTION_P(type) \
 460   (TREE_CODE (type) == FUNCTION_TYPE)
 461
 462 /* For convenience we define a single macro to identify the class of
 463    object or incomplete types.  */
 464 #define C_TYPE_OBJECT_OR_INCOMPLETE_P(type) \
 465   (!C_TYPE_FUNCTION_P (type))
 466
 467 /* Record in each node resulting from a binary operator
 468    what operator was specified for it.  */
 469 #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp))
 470
 471 /* Pointer to function to lazily generate the VAR_DECL for __FUNCTION__ etc.
 472    ID is the identifier to use, NAME is the string.
 473    TYPE_DEP indicates whether it depends on type of the function or not
 474    (i.e. __PRETTY_FUNCTION__).  */
 475
 476 extern tree (*make_fname_decl)                  PARAMS ((tree, int));
 477
 478 extern tree identifier_global_value             PARAMS ((tree));
 479 extern void record_builtin_type                 PARAMS ((enum rid,
 480                                                          const char *, tree));
 481 extern tree build_void_list_node                PARAMS ((void));
 482 extern void start_fname_decls                   PARAMS ((void));
 483 extern void finish_fname_decls                  PARAMS ((void));
 484 extern const char *fname_as_string              PARAMS ((int));
 485 extern tree fname_decl                          PARAMS ((unsigned, tree));
 486 extern const char *fname_string                 PARAMS ((unsigned));
 487
 488 extern void check_function_format               PARAMS ((int *, tree, tree));
 489 extern void set_Wformat                         PARAMS ((int));
 490 extern tree handle_format_attribute             PARAMS ((tree *, tree, tree,
 491                                                          int, bool *));
 492 extern tree handle_format_arg_attribute         PARAMS ((tree *, tree, tree,
 493                                                          int, bool *));
 494 extern void c_common_insert_default_attributes  PARAMS ((tree));
 495 extern void c_apply_type_quals_to_decl          PARAMS ((int, tree));
 496 extern tree c_sizeof                            PARAMS ((tree));
 497 extern tree c_alignof                           PARAMS ((tree));
 498 extern tree c_alignof_expr                      PARAMS ((tree));
 499 /* Print an error message for invalid operands to arith operation CODE.
 500    NOP_EXPR is used as a special case (see truthvalue_conversion).  */
 501 extern void binary_op_error                     PARAMS ((enum tree_code));
 502 extern tree c_expand_expr_stmt                  PARAMS ((tree));
 503 extern void c_expand_start_cond                 PARAMS ((tree, int));
 504 extern void c_finish_then                       PARAMS ((void));
 505 extern void c_expand_start_else                 PARAMS ((void));
 506 extern void c_finish_else                   PARAMS ((void));
 507 extern void c_expand_end_cond                   PARAMS ((void));
 508 /* Validate the expression after `case' and apply default promotions.  */
 509 extern tree check_case_value                    PARAMS ((tree));
 510 /* Concatenate a list of STRING_CST nodes into one STRING_CST.  */
 511 extern tree combine_strings                     PARAMS ((tree));
 512 extern void constant_expression_warning         PARAMS ((tree));
 513 extern tree convert_and_check                   PARAMS ((tree, tree));
 514 extern void overflow_warning                    PARAMS ((tree));
 515 extern void unsigned_conversion_warning         PARAMS ((tree, tree));
 516
 517 /* Read the rest of the current #-directive line.  */
 518 extern char *get_directive_line                 PARAMS ((void));
 519 #define GET_DIRECTIVE_LINE() get_directive_line ()
 520
 521 /* Subroutine of build_binary_op, used for comparison operations.
 522    See if the operands have both been converted from subword integer types
 523    and, if so, perhaps change them both back to their original type.  */
 524 extern tree shorten_compare                     PARAMS ((tree *, tree *, tree *, enum tree_code *));
 525
 526 extern unsigned int min_precision               PARAMS ((tree, int));
 527
 528 /* Add qualifiers to a type, in the fashion for C.  */
 529 extern tree c_build_qualified_type              PARAMS ((tree, int));
 530
 531 /* Build tree nodes and builtin functions common to both C and C++ language
 532    frontends.  */
 533 extern void c_common_nodes_and_builtins         PARAMS ((void));
 534
 535 extern void disable_builtin_function            PARAMS ((const char *));
 536
 537 extern tree build_va_arg                        PARAMS ((tree, tree));
 538
 539 extern void c_common_init_options               PARAMS ((enum c_language_kind));
 540 extern void c_common_post_options               PARAMS ((void));
 541 extern const char *c_common_init                PARAMS ((const char *));
 542 extern void c_common_finish                     PARAMS ((void));
 543 extern HOST_WIDE_INT c_common_get_alias_set     PARAMS ((tree));
 544 extern bool c_promoting_integer_type_p          PARAMS ((tree));
 545 extern int self_promoting_args_p                PARAMS ((tree));
 546 extern tree simple_type_promotes_to             PARAMS ((tree));
 547 extern tree strip_array_types                   PARAMS ((tree));
 548
 549 /* These macros provide convenient access to the various _STMT nodes.  */
 550
 551 /* Nonzero if this statement should be considered a full-expression,
 552    i.e., if temporaries created during this statement should have
 553    their destructors run at the end of this statement.  (In C, this
 554    will always be false, since there are no destructors.)  */
 555 #define STMT_IS_FULL_EXPR_P(NODE) TREE_LANG_FLAG_1 ((NODE))
 556
 557 /* IF_STMT accessors. These give access to the condition of the if
 558    statement, the then block of the if statement, and the else block
 559    of the if statement if it exists.  */
 560 #define IF_COND(NODE)           TREE_OPERAND (IF_STMT_CHECK (NODE), 0)
 561 #define THEN_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 1)
 562 #define ELSE_CLAUSE(NODE)       TREE_OPERAND (IF_STMT_CHECK (NODE), 2)
 563
 564 /* WHILE_STMT accessors. These give access to the condition of the
 565    while statement and the body of the while statement, respectively.  */
 566 #define WHILE_COND(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 0)
 567 #define WHILE_BODY(NODE)        TREE_OPERAND (WHILE_STMT_CHECK (NODE), 1)
 568
 569 /* DO_STMT accessors. These give access to the condition of the do
 570    statement and the body of the do statement, respectively.  */
 571 #define DO_COND(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 0)
 572 #define DO_BODY(NODE)           TREE_OPERAND (DO_STMT_CHECK (NODE), 1)
 573
 574 /* RETURN_STMT accessors. These give the expression associated with a
 575    return statement, and whether it should be ignored when expanding
 576    (as opposed to inlining).  */
 577 #define RETURN_EXPR(NODE)       TREE_OPERAND (RETURN_STMT_CHECK (NODE), 0)
 578
 579 /* EXPR_STMT accessor. This gives the expression associated with an
 580    expression statement.  */
 581 #define EXPR_STMT_EXPR(NODE)    TREE_OPERAND (EXPR_STMT_CHECK (NODE), 0)
 582
 583 /* FOR_STMT accessors. These give access to the init statement,
 584    condition, update expression, and body of the for statement,
 585    respectively.  */
 586 #define FOR_INIT_STMT(NODE)     TREE_OPERAND (FOR_STMT_CHECK (NODE), 0)
 587 #define FOR_COND(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 1)
 588 #define FOR_EXPR(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 2)
 589 #define FOR_BODY(NODE)          TREE_OPERAND (FOR_STMT_CHECK (NODE), 3)
 590
 591 /* SWITCH_STMT accessors. These give access to the condition and body
 592    of the switch statement, respectively.  */
 593 #define SWITCH_COND(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 0)
 594 #define SWITCH_BODY(NODE)       TREE_OPERAND (SWITCH_STMT_CHECK (NODE), 1)
 595
 596 /* CASE_LABEL accessors. These give access to the high and low values
 597    of a case label, respectively.  */
 598 #define CASE_LOW(NODE)          TREE_OPERAND (CASE_LABEL_CHECK (NODE), 0)
 599 #define CASE_HIGH(NODE)         TREE_OPERAND (CASE_LABEL_CHECK (NODE), 1)
 600 #define CASE_LABEL_DECL(NODE)   TREE_OPERAND (CASE_LABEL_CHECK (NODE), 2)
 601
 602 /* GOTO_STMT accessor. This gives access to the label associated with
 603    a goto statement.  */
 604 #define GOTO_DESTINATION(NODE)  TREE_OPERAND (GOTO_STMT_CHECK (NODE), 0)
 605 /* True for goto created artifically by the compiler.  */
 606 #define GOTO_FAKE_P(NODE)       (TREE_LANG_FLAG_0 (GOTO_STMT_CHECK (NODE)))
 607
 608 /* COMPOUND_STMT accessor. This gives access to the TREE_LIST of
 609    statements associated with a compound statement. The result is the
 610    first statement in the list. Succeeding nodes can be accessed by
 611    calling TREE_CHAIN on a node in the list.  */
 612 #define COMPOUND_BODY(NODE)     TREE_OPERAND (COMPOUND_STMT_CHECK (NODE), 0)
 613
 614 /* ASM_STMT accessors. ASM_STRING returns a STRING_CST for the
 615    instruction (e.g., "mov x, y"). ASM_OUTPUTS, ASM_INPUTS, and
 616    ASM_CLOBBERS represent the outputs, inputs, and clobbers for the
 617    statement.  */
 618 #define ASM_CV_QUAL(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 0)
 619 #define ASM_STRING(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 1)
 620 #define ASM_OUTPUTS(NODE)       TREE_OPERAND (ASM_STMT_CHECK (NODE), 2)
 621 #define ASM_INPUTS(NODE)        TREE_OPERAND (ASM_STMT_CHECK (NODE), 3)
 622 #define ASM_CLOBBERS(NODE)      TREE_OPERAND (ASM_STMT_CHECK (NODE), 4)
 623
 624 /* DECL_STMT accessor. This gives access to the DECL associated with
 625    the given declaration statement.  */
 626 #define DECL_STMT_DECL(NODE)    TREE_OPERAND (DECL_STMT_CHECK (NODE), 0)
 627
 628 /* STMT_EXPR accessor.  */
 629 #define STMT_EXPR_STMT(NODE)    TREE_OPERAND (STMT_EXPR_CHECK (NODE), 0)
 630
 631 /* LABEL_STMT accessor. This gives access to the label associated with
 632    the given label statement.  */
 633 #define LABEL_STMT_LABEL(NODE)  TREE_OPERAND (LABEL_STMT_CHECK (NODE), 0)
 634
 635 /* COMPOUND_LITERAL_EXPR accessor.  */
 636 #define COMPOUND_LITERAL_EXPR_DECL(NODE)                \
 637   TREE_OPERAND (COMPOUND_LITERAL_EXPR_CHECK (NODE), 0)
 638
 639 /* Nonzero if this SCOPE_STMT is for the beginning of a scope.  */
 640 #define SCOPE_BEGIN_P(NODE) \
 641   (TREE_LANG_FLAG_0 (SCOPE_STMT_CHECK (NODE)))
 642
 643 /* Nonzero if this SCOPE_STMT is for the end of a scope.  */
 644 #define SCOPE_END_P(NODE) \
 645   (!SCOPE_BEGIN_P (SCOPE_STMT_CHECK (NODE)))
 646
 647 /* The BLOCK containing the declarations contained in this scope.  */
 648 #define SCOPE_STMT_BLOCK(NODE) \
 649   (TREE_OPERAND (SCOPE_STMT_CHECK (NODE), 0))
 650
 651 /* Nonzero for a SCOPE_STMT if there were no variables in this scope.  */
 652 #define SCOPE_NULLIFIED_P(NODE) \
 653   (SCOPE_STMT_BLOCK ((NODE)) == NULL_TREE)
 654
 655 /* Nonzero for a SCOPE_STMT which represents a lexical scope, but
 656    which should be treated as non-existent from the point of view of
 657    running cleanup actions.  */
 658 #define SCOPE_NO_CLEANUPS_P(NODE) \
 659   (TREE_LANG_FLAG_3 (SCOPE_STMT_CHECK (NODE)))
 660
 661 /* Nonzero for a SCOPE_STMT if this statement is for a partial scope.
 662    For example, in:
 663
 664      S s;
 665      l:
 666      S s2;
 667      goto l;
 668
 669    there is (implicitly) a new scope after `l', even though there are
 670    no curly braces.  In particular, when we hit the goto, we must
 671    destroy s2 and then re-construct it.  For the implicit scope,
 672    SCOPE_PARTIAL_P will be set.  */
 673 #define SCOPE_PARTIAL_P(NODE) \
 674   (TREE_LANG_FLAG_4 (SCOPE_STMT_CHECK (NODE)))
 675
 676 /* Nonzero for an ASM_STMT if the assembly statement is volatile.  */
 677 #define ASM_VOLATILE_P(NODE)                    \
 678   (ASM_CV_QUAL (ASM_STMT_CHECK (NODE)) != NULL_TREE)
 679
 680 /* The line-number at which a statement began.  But if
 681    STMT_LINENO_FOR_FN_P does holds, then this macro gives the
 682    line number for the end of the current function instead.  */
 683 #define STMT_LINENO(NODE)                       \
 684   (TREE_COMPLEXITY ((NODE)))
 685
 686 /* If non-zero, the STMT_LINENO for NODE is the line at which the
 687    function ended.  */
 688 #define STMT_LINENO_FOR_FN_P(NODE)              \
 689   (TREE_LANG_FLAG_2 ((NODE)))
 690
 691 /* Nonzero if we want the new ISO rules for pushing a new scope for `for'
 692    initialization variables.  */
 693 #define NEW_FOR_SCOPE_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 694
 695 /* Nonzero if we want to create an ASM_INPUT instead of an
 696    ASM_OPERAND with no operands.  */
 697 #define ASM_INPUT_P(NODE) (TREE_LANG_FLAG_0 (NODE))
 698
 699 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) SYM,
 700
 701 enum c_tree_code {
 702   C_DUMMY_TREE_CODE = LAST_AND_UNUSED_TREE_CODE,
 703 #include "c-common.def"
 704   LAST_C_TREE_CODE
 705 };
 706
 707 #undef DEFTREECODE
 708
 709 extern void add_c_tree_codes                    PARAMS ((void));
 710 extern void genrtl_do_pushlevel                 PARAMS ((void));
 711 extern void genrtl_goto_stmt                    PARAMS ((tree));
 712 extern void genrtl_expr_stmt                    PARAMS ((tree));
 713 extern void genrtl_decl_stmt                    PARAMS ((tree));
 714 extern void genrtl_if_stmt                      PARAMS ((tree));
 715 extern void genrtl_while_stmt                   PARAMS ((tree));
 716 extern void genrtl_do_stmt                      PARAMS ((tree));
 717 extern void genrtl_return_stmt                  PARAMS ((tree));
 718 extern void genrtl_for_stmt                     PARAMS ((tree));
 719 extern void genrtl_break_stmt                   PARAMS ((void));
 720 extern void genrtl_continue_stmt                PARAMS ((void));
 721 extern void genrtl_scope_stmt                   PARAMS ((tree));
 722 extern void genrtl_switch_stmt                  PARAMS ((tree));
 723 extern void genrtl_case_label                   PARAMS ((tree));
 724 extern void genrtl_compound_stmt                PARAMS ((tree));
 725 extern void genrtl_asm_stmt                     PARAMS ((tree, tree,
 726                                                          tree, tree,
 727                                                          tree, int));
 728 extern void genrtl_decl_cleanup                 PARAMS ((tree, tree));
 729 extern int stmts_are_full_exprs_p               PARAMS ((void));
 730 extern int anon_aggr_type_p                     PARAMS ((tree));
 731
 732 /* For a VAR_DECL that is an anonymous union, these are the various
 733    sub-variables that make up the anonymous union.  */
 734 #define DECL_ANON_UNION_ELEMS(NODE) DECL_ARGUMENTS ((NODE))
 735
 736 /* In a FIELD_DECL, nonzero if the decl was originally a bitfield.  */
 737 #define DECL_C_BIT_FIELD(NODE) \
 738   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) == 1)
 739 #define SET_DECL_C_BIT_FIELD(NODE) \
 740   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 1)
 741 #define CLEAR_DECL_C_BIT_FIELD(NODE) \
 742   (DECL_LANG_FLAG_4 (FIELD_DECL_CHECK (NODE)) = 0)
 743
 744 /* In a VAR_DECL, nonzero if the decl is a register variable with
 745    an explicit asm specification.  */
 746 #define DECL_C_HARD_REGISTER(DECL)  DECL_LANG_FLAG_4 (VAR_DECL_CHECK (DECL))
 747
 748 extern void emit_local_var                      PARAMS ((tree));
 749 extern void make_rtl_for_local_static           PARAMS ((tree));
 750 extern tree expand_cond                         PARAMS ((tree));
 751 extern tree c_expand_return                     PARAMS ((tree));
 752 extern tree do_case                             PARAMS ((tree, tree));
 753 extern tree build_stmt                          PARAMS ((enum tree_code, ...));
 754 extern tree build_case_label                    PARAMS ((tree, tree, tree));
 755 extern tree build_continue_stmt                 PARAMS ((void));
 756 extern tree build_break_stmt                    PARAMS ((void));
 757 extern tree build_return_stmt                   PARAMS ((tree));
 758
 759 #define COMPOUND_STMT_NO_SCOPE(NODE)    TREE_LANG_FLAG_0 (NODE)
 760
 761 extern void c_expand_asm_operands               PARAMS ((tree, tree, tree, tree, int, const char *, int));
 762
 763 /* These functions must be defined by each front-end which implements
 764    a variant of the C language.  They are used in c-common.c.  */
 765
 766 extern tree build_unary_op                      PARAMS ((enum tree_code,
 767                                                          tree, int));
 768 extern tree build_binary_op                     PARAMS ((enum tree_code,
 769                                                          tree, tree, int));
 770 extern int lvalue_p                             PARAMS ((tree));
 771 extern tree default_conversion                  PARAMS ((tree));
 772
 773 /* Given two integer or real types, return the type for their sum.
 774    Given two compatible ANSI C types, returns the merged type.  */
 775
 776 extern tree common_type                         PARAMS ((tree, tree));
 777
 778 extern tree expand_tree_builtin                 PARAMS ((tree, tree, tree));
 779
 780 extern tree decl_constant_value         PARAMS ((tree));
 781
 782 /* Handle increment and decrement of boolean types.  */
 783 extern tree boolean_increment                   PARAMS ((enum tree_code,
 784                                                          tree));
 785
 786 /* Hook currently used only by the C++ front end to reset internal state
 787    after entering or leaving a header file.  */
 788 extern void extract_interface_info              PARAMS ((void));
 789
 790 extern void mark_c_language_function            PARAMS ((struct language_function *));
 791
 792 extern int case_compare                         PARAMS ((splay_tree_key,
 793                                                          splay_tree_key));
 794
 795 extern tree c_add_case_label                    PARAMS ((splay_tree,
 796                                                          tree, tree,
 797                                                          tree));
 798
 799 extern tree build_function_call                 PARAMS ((tree, tree));
 800
 801 extern tree finish_label_address_expr           PARAMS ((tree));
 802
 803 /* Same function prototype, but the C and C++ front ends have
 804    different implementations.  Used in c-common.c.  */
 805 extern tree lookup_label                        PARAMS ((tree));
 806
 807 /* If this variable is defined to a non-NULL value, it will be called
 808    after the file has been completely parsed.  The argument will be
 809    the GLOBAL_NAMESPACE in C++, or the list of top-level declarations
 810    in C.  */
 811 extern void (*back_end_hook) PARAMS ((tree));
 812
 813 /* enum expand_modified is in expr.h, as is the macro below.  */
 814
 815 #ifdef QUEUED_VAR
 816 extern rtx c_expand_expr            PARAMS ((tree, rtx, enum machine_mode,
 817                                              enum expand_modifier));
 818 #endif
 819
 820 extern int c_safe_from_p                        PARAMS ((rtx, tree));
 821
 822 extern int c_staticp                            PARAMS ((tree));
 823
 824 extern int c_unsafe_for_reeval                  PARAMS ((tree));
 825
 826 /* Information recorded about each file examined during compilation.  */
 827
 828 struct c_fileinfo
 829 {
 830   int time;     /* Time spent in the file.  */
 831   short interface_only;         /* Flags - used only by C++ */
 832   short interface_unknown;
 833 };
 834
 835 struct c_fileinfo *get_fileinfo                 PARAMS ((const char *));
 836 extern void dump_time_statistics                PARAMS ((void));
 837
 838 #endif /* ! GCC_C_COMMON_H */