contrib/gcc-4.7/gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_C_TREE_H
  23 #define GCC_C_TREE_H
  24
  25 #include "c-family/c-common.h"
  26 #include "diagnostic.h"
  27
  28 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  29    know how big it is.  This is sanity-checked in c-decl.c.  */
  30 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  31   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  32
  33 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  34 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  35
  36 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  37 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  38
  39 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  40    nonzero if the definition of the type has already started.  */
  41 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  42
  43 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  44    declarations whose type would be completed by completing that type.  */
  45 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  46
  47 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  48    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  49    and C_RID_YYCODE is the token number wanted by Yacc.  */
  50 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  51
  52 /* Record whether a type or decl was written with nonconstant size.
  53    Note that TYPE_SIZE may have simplified to a constant.  */
  54 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  55 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  56
  57 /* Record whether a type is defined inside a struct or union type.
  58    This is used for -Wc++-compat. */
  59 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
  60
  61 /* Record whether a typedef for type `int' was actually `signed int'.  */
  62 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  63
  64 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  65    return type.  */
  66 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  67
  68 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  69 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  70
  71 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  72    been declared.  */
  73 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  74   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  75
  76 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  77    built-in prototype and does not have a non-built-in prototype.  */
  78 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  79   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  80
  81 /* Record whether a decl was declared register.  This is strictly a
  82    front-end flag, whereas DECL_REGISTER is used for code generation;
  83    they may differ for structures with volatile fields.  */
  84 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  85
  86 /* Record whether a decl was used in an expression anywhere except an
  87    unevaluated operand of sizeof / typeof / alignof.  This is only
  88    used for functions declared static but not defined, though outside
  89    sizeof and typeof it is set for other function decls as well.  */
  90 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  91
  92 /* Record whether a variable has been declared threadprivate by
  93    #pragma omp threadprivate.  */
  94 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  95
  96 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
  97    N.B. Could be simplified if all built-in decls had complete prototypes
  98    (but this is presently difficult because some of them need FILE*).  */
  99 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 100        (EXP == 0                                        \
 101         || (!prototype_p (TREE_TYPE (EXP))      \
 102             && !DECL_BUILT_IN (EXP)))
 103
 104 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 105    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 106    without prototypes.  */
 107 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 108
 109 /* For a CONSTRUCTOR, whether some initializer contains a
 110    subexpression meaning it is not a constant expression.  */
 111 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 112
 113 /* Record parser information about an expression that is irrelevant
 114    for code generation alongside a tree representing its value.  */
 115 struct c_expr
 116 {
 117   /* The value of the expression.  */
 118   tree value;
 119   /* Record the original unary/binary operator of an expression, which may
 120      have been changed by fold, STRING_CST for unparenthesized string
 121      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 122      (even if parenthesized), for subexpressions, and for non-constant
 123      initializers, or ERROR_MARK for other expressions (including
 124      parenthesized expressions).  */
 125   enum tree_code original_code;
 126   /* If not NULL, the original type of an expression.  This will
 127      differ from the type of the value field for an enum constant.
 128      The type of an enum constant is a plain integer type, but this
 129      field will be the enum type.  */
 130   tree original_type;
 131 };
 132
 133 /* Type alias for struct c_expr. This allows to use the structure
 134    inside the VEC types.  */
 135 typedef struct c_expr c_expr_t;
 136
 137 /* A varray of c_expr_t.  */
 138 DEF_VEC_O (c_expr_t);
 139 DEF_VEC_ALLOC_O (c_expr_t, gc);
 140 DEF_VEC_ALLOC_O (c_expr_t, heap);
 141
 142 /* Append a new c_expr_t element to V.  */
 143 #define C_EXPR_APPEND(V, ELEM) \
 144   do { \
 145     c_expr_t *__elem_p = VEC_safe_push (c_expr_t, gc, V, NULL); \
 146     *__elem_p = (ELEM); \
 147   } while (0)
 148
 149 /* A kind of type specifier.  Note that this information is currently
 150    only used to distinguish tag definitions, tag references and typeof
 151    uses.  */
 152 enum c_typespec_kind {
 153   /* No typespec.  This appears only in struct c_declspec.  */
 154   ctsk_none,
 155   /* A reserved keyword type specifier.  */
 156   ctsk_resword,
 157   /* A reference to a tag, previously declared, such as "struct foo".
 158      This includes where the previous declaration was as a different
 159      kind of tag, in which case this is only valid if shadowing that
 160      tag in an inner scope.  */
 161   ctsk_tagref,
 162   /* A reference to a tag, not previously declared in a visible
 163      scope.  */
 164   ctsk_tagfirstref,
 165   /* A definition of a tag such as "struct foo { int a; }".  */
 166   ctsk_tagdef,
 167   /* A typedef name.  */
 168   ctsk_typedef,
 169   /* An ObjC-specific kind of type specifier.  */
 170   ctsk_objc,
 171   /* A typeof specifier.  */
 172   ctsk_typeof
 173 };
 174
 175 /* A type specifier: this structure is created in the parser and
 176    passed to declspecs_add_type only.  */
 177 struct c_typespec {
 178   /* What kind of type specifier this is.  */
 179   enum c_typespec_kind kind;
 180   /* Whether the expression has operands suitable for use in constant
 181      expressions.  */
 182   bool expr_const_operands;
 183   /* The specifier itself.  */
 184   tree spec;
 185   /* An expression to be evaluated before the type specifier, in the
 186      case of typeof specifiers, or NULL otherwise or if no such
 187      expression is required for a particular typeof specifier.  In
 188      particular, when typeof is applied to an expression of variably
 189      modified type, that expression must be evaluated in order to
 190      determine array sizes that form part of the type, but the
 191      expression itself (as opposed to the array sizes) forms no part
 192      of the type and so needs to be recorded separately.  */
 193   tree expr;
 194 };
 195
 196 /* A storage class specifier.  */
 197 enum c_storage_class {
 198   csc_none,
 199   csc_auto,
 200   csc_extern,
 201   csc_register,
 202   csc_static,
 203   csc_typedef
 204 };
 205
 206 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 207    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 208    or none of these.  */
 209 enum c_typespec_keyword {
 210   cts_none,
 211   cts_void,
 212   cts_bool,
 213   cts_char,
 214   cts_int,
 215   cts_float,
 216   cts_int128,
 217   cts_double,
 218   cts_dfloat32,
 219   cts_dfloat64,
 220   cts_dfloat128,
 221   cts_fract,
 222   cts_accum
 223 };
 224
 225 /* A sequence of declaration specifiers in C.  */
 226 struct c_declspecs {
 227   /* The type specified, if a single type specifier such as a struct,
 228      union or enum specifier, typedef name or typeof specifies the
 229      whole type, or NULL_TREE if none or a keyword such as "void" or
 230      "char" is used.  Does not include qualifiers.  */
 231   tree type;
 232   /* Any expression to be evaluated before the type, from a typeof
 233      specifier.  */
 234   tree expr;
 235   /* The attributes from a typedef decl.  */
 236   tree decl_attr;
 237   /* When parsing, the attributes.  Outside the parser, this will be
 238      NULL; attributes (possibly from multiple lists) will be passed
 239      separately.  */
 240   tree attrs;
 241   /* The base-2 log of the greatest alignment required by an _Alignas
 242      specifier, in bytes, or -1 if no such specifiers with nonzero
 243      alignment.  */
 244   int align_log;
 245   /* The storage class specifier, or csc_none if none.  */
 246   enum c_storage_class storage_class;
 247   /* Any type specifier keyword used such as "int", not reflecting
 248      modifiers such as "short", or cts_none if none.  */
 249   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 250   /* The kind of type specifier if one has been seen, ctsk_none
 251      otherwise.  */
 252   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 253   /* Whether any expressions in typeof specifiers may appear in
 254      constant expressions.  */
 255   BOOL_BITFIELD expr_const_operands : 1;
 256   /* Whether any declaration specifiers have been seen at all.  */
 257   BOOL_BITFIELD declspecs_seen_p : 1;
 258   /* Whether something other than a storage class specifier or
 259      attribute has been seen.  This is used to warn for the
 260      obsolescent usage of storage class specifiers other than at the
 261      start of the list.  (Doing this properly would require function
 262      specifiers to be handled separately from storage class
 263      specifiers.)  */
 264   BOOL_BITFIELD non_sc_seen_p : 1;
 265   /* Whether the type is specified by a typedef or typeof name.  */
 266   BOOL_BITFIELD typedef_p : 1;
 267   /* Whether the type is explicitly "signed" or specified by a typedef
 268      whose type is explicitly "signed".  */
 269   BOOL_BITFIELD explicit_signed_p : 1;
 270   /* Whether the specifiers include a deprecated typedef.  */
 271   BOOL_BITFIELD deprecated_p : 1;
 272   /* Whether the type defaulted to "int" because there were no type
 273      specifiers.  */
 274   BOOL_BITFIELD default_int_p : 1;
 275   /* Whether "long" was specified.  */
 276   BOOL_BITFIELD long_p : 1;
 277   /* Whether "long" was specified more than once.  */
 278   BOOL_BITFIELD long_long_p : 1;
 279   /* Whether "short" was specified.  */
 280   BOOL_BITFIELD short_p : 1;
 281   /* Whether "signed" was specified.  */
 282   BOOL_BITFIELD signed_p : 1;
 283   /* Whether "unsigned" was specified.  */
 284   BOOL_BITFIELD unsigned_p : 1;
 285   /* Whether "complex" was specified.  */
 286   BOOL_BITFIELD complex_p : 1;
 287   /* Whether "inline" was specified.  */
 288   BOOL_BITFIELD inline_p : 1;
 289   /* Whether "_Noreturn" was speciied.  */
 290   BOOL_BITFIELD noreturn_p : 1;
 291   /* Whether "__thread" was specified.  */
 292   BOOL_BITFIELD thread_p : 1;
 293   /* Whether "const" was specified.  */
 294   BOOL_BITFIELD const_p : 1;
 295   /* Whether "volatile" was specified.  */
 296   BOOL_BITFIELD volatile_p : 1;
 297   /* Whether "restrict" was specified.  */
 298   BOOL_BITFIELD restrict_p : 1;
 299   /* Whether "_Sat" was specified.  */
 300   BOOL_BITFIELD saturating_p : 1;
 301   /* Whether any alignment specifier (even with zero alignment) was
 302      specified.  */
 303   BOOL_BITFIELD alignas_p : 1;
 304   /* The address space that the declaration belongs to.  */
 305   addr_space_t address_space;
 306 };
 307
 308 /* The various kinds of declarators in C.  */
 309 enum c_declarator_kind {
 310   /* An identifier.  */
 311   cdk_id,
 312   /* A function.  */
 313   cdk_function,
 314   /* An array.  */
 315   cdk_array,
 316   /* A pointer.  */
 317   cdk_pointer,
 318   /* Parenthesized declarator with nested attributes.  */
 319   cdk_attrs
 320 };
 321
 322 typedef struct c_arg_tag_d {
 323   /* The argument name.  */
 324   tree id;
 325   /* The type of the argument.  */
 326   tree type;
 327 } c_arg_tag;
 328
 329 DEF_VEC_O(c_arg_tag);
 330 DEF_VEC_ALLOC_O(c_arg_tag,gc);
 331
 332 /* Information about the parameters in a function declarator.  */
 333 struct c_arg_info {
 334   /* A list of parameter decls.  */
 335   tree parms;
 336   /* A list of structure, union and enum tags defined.  */
 337   VEC(c_arg_tag,gc) *tags;
 338   /* A list of argument types to go in the FUNCTION_TYPE.  */
 339   tree types;
 340   /* A list of non-parameter decls (notably enumeration constants)
 341      defined with the parameters.  */
 342   tree others;
 343   /* A compound expression of VLA sizes from the parameters, or NULL.
 344      In a function definition, these are used to ensure that
 345      side-effects in sizes of arrays converted to pointers (such as a
 346      parameter int i[n++]) take place; otherwise, they are
 347      ignored.  */
 348   tree pending_sizes;
 349   /* True when these arguments had [*].  */
 350   BOOL_BITFIELD had_vla_unspec : 1;
 351 };
 352
 353 /* A declarator.  */
 354 struct c_declarator {
 355   /* The kind of declarator.  */
 356   enum c_declarator_kind kind;
 357   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 358   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 359   struct c_declarator *declarator;
 360   union {
 361     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 362        declarator.  */
 363     tree id;
 364     /* For functions.  */
 365     struct c_arg_info *arg_info;
 366     /* For arrays.  */
 367     struct {
 368       /* The array dimension, or NULL for [] and [*].  */
 369       tree dimen;
 370       /* The qualifiers inside [].  */
 371       int quals;
 372       /* The attributes (currently ignored) inside [].  */
 373       tree attrs;
 374       /* Whether [static] was used.  */
 375       BOOL_BITFIELD static_p : 1;
 376       /* Whether [*] was used.  */
 377       BOOL_BITFIELD vla_unspec_p : 1;
 378     } array;
 379     /* For pointers, the qualifiers on the pointer type.  */
 380     int pointer_quals;
 381     /* For attributes.  */
 382     tree attrs;
 383   } u;
 384 };
 385
 386 /* A type name.  */
 387 struct c_type_name {
 388   /* The declaration specifiers.  */
 389   struct c_declspecs *specs;
 390   /* The declarator.  */
 391   struct c_declarator *declarator;
 392 };
 393
 394 /* A parameter.  */
 395 struct c_parm {
 396   /* The declaration specifiers, minus any prefix attributes.  */
 397   struct c_declspecs *specs;
 398   /* The attributes.  */
 399   tree attrs;
 400   /* The declarator.  */
 401   struct c_declarator *declarator;
 402 };
 403
 404 /* Used when parsing an enum.  Initialized by start_enum.  */
 405 struct c_enum_contents
 406 {
 407   /* While defining an enum type, this is 1 plus the last enumerator
 408      constant value.  */
 409   tree enum_next_value;
 410
 411   /* Nonzero means that there was overflow computing enum_next_value.  */
 412   int enum_overflow;
 413 };
 414
 415 /* A type of reference to a static identifier in an inline
 416    function.  */
 417 enum c_inline_static_type {
 418   /* Identifier with internal linkage used in function that may be an
 419      inline definition (i.e., file-scope static).  */
 420   csi_internal,
 421   /* Modifiable object with static storage duration defined in
 422      function that may be an inline definition (i.e., local
 423      static).  */
 424   csi_modifiable
 425 };
 426
 427 \f
 428 /* in c-parser.c */
 429 extern void c_parse_init (void);
 430
 431 /* in c-aux-info.c */
 432 extern void gen_aux_info_record (tree, int, int, int);
 433
 434 /* in c-decl.c */
 435 struct c_spot_bindings;
 436 struct c_struct_parse_info;
 437 extern struct obstack parser_obstack;
 438 extern tree c_break_label;
 439 extern tree c_cont_label;
 440
 441 extern bool global_bindings_p (void);
 442 extern void push_scope (void);
 443 extern tree pop_scope (void);
 444 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 445 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 446
 447 extern void record_inline_static (location_t, tree, tree,
 448                                   enum c_inline_static_type);
 449 extern void c_init_decl_processing (void);
 450 extern void c_print_identifier (FILE *, tree, int);
 451 extern int quals_from_declspecs (const struct c_declspecs *);
 452 extern struct c_declarator *build_array_declarator (location_t, tree,
 453                                                     struct c_declspecs *,
 454                                                     bool, bool);
 455 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 456                               tree, tree);
 457 extern tree check_for_loop_decls (location_t, bool);
 458 extern void mark_forward_parm_decls (void);
 459 extern void declare_parm_level (void);
 460 extern void undeclared_variable (location_t, tree);
 461 extern tree lookup_label_for_goto (location_t, tree);
 462 extern tree declare_label (tree);
 463 extern tree define_label (location_t, tree);
 464 extern struct c_spot_bindings *c_get_switch_bindings (void);
 465 extern void c_release_switch_bindings (struct c_spot_bindings *);
 466 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 467                                           location_t, location_t);
 468 extern void finish_decl (tree, location_t, tree, tree, tree);
 469 extern tree finish_enum (tree, tree, tree);
 470 extern void finish_function (void);
 471 extern tree finish_struct (location_t, tree, tree, tree,
 472                            struct c_struct_parse_info *);
 473 extern struct c_arg_info *build_arg_info (void);
 474 extern struct c_arg_info *get_parm_info (bool, tree);
 475 extern tree grokfield (location_t, struct c_declarator *,
 476                        struct c_declspecs *, tree, tree *);
 477 extern tree groktypename (struct c_type_name *, tree *, bool *);
 478 extern tree grokparm (const struct c_parm *, tree *);
 479 extern tree implicitly_declare (location_t, tree);
 480 extern void keep_next_level (void);
 481 extern void pending_xref_error (void);
 482 extern void c_push_function_context (void);
 483 extern void c_pop_function_context (void);
 484 extern void push_parm_decl (const struct c_parm *, tree *);
 485 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 486                                                         struct c_declarator *);
 487 extern tree c_builtin_function (tree);
 488 extern tree c_builtin_function_ext_scope (tree);
 489 extern void shadow_tag (const struct c_declspecs *);
 490 extern void shadow_tag_warned (const struct c_declspecs *, int);
 491 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 492 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 493 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 494                         tree);
 495 extern tree start_struct (location_t, enum tree_code, tree,
 496                           struct c_struct_parse_info **);
 497 extern void store_parm_decls (void);
 498 extern void store_parm_decls_from (struct c_arg_info *);
 499 extern tree xref_tag (enum tree_code, tree);
 500 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 501 extern int c_expand_decl (tree);
 502 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 503                                     struct c_declarator *);
 504 extern struct c_declarator *build_attrs_declarator (tree,
 505                                                     struct c_declarator *);
 506 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 507                                                        struct c_declarator *);
 508 extern struct c_declarator *build_id_declarator (tree);
 509 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 510                                                      struct c_declarator *);
 511 extern struct c_declspecs *build_null_declspecs (void);
 512 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 513 extern struct c_declspecs *declspecs_add_type (location_t,
 514                                                struct c_declspecs *,
 515                                                struct c_typespec);
 516 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 517 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 518 extern struct c_declspecs *declspecs_add_addrspace (struct c_declspecs *,
 519                                                     addr_space_t);
 520 extern struct c_declspecs *declspecs_add_alignas (struct c_declspecs *, tree);
 521 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 522
 523 /* in c-objc-common.c */
 524 extern bool c_objc_common_init (void);
 525 extern bool c_missing_noreturn_ok_p (tree);
 526 extern bool c_warn_unused_global_decl (const_tree);
 527 extern void c_initialize_diagnostics (diagnostic_context *);
 528 extern bool c_vla_unspec_p (tree x, tree fn);
 529
 530 /* in c-typeck.c */
 531 extern int in_alignof;
 532 extern int in_sizeof;
 533 extern int in_typeof;
 534
 535 extern struct c_switch *c_switch_stack;
 536
 537 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 538 extern tree require_complete_type (tree);
 539 extern int same_translation_unit_p (const_tree, const_tree);
 540 extern int comptypes (tree, tree);
 541 extern int comptypes_check_different_types (tree, tree, bool *);
 542 extern bool c_vla_type_p (const_tree);
 543 extern bool c_mark_addressable (tree);
 544 extern void c_incomplete_type_error (const_tree, const_tree);
 545 extern tree c_type_promotes_to (tree);
 546 extern struct c_expr default_function_array_conversion (location_t,
 547                                                         struct c_expr);
 548 extern struct c_expr default_function_array_read_conversion (location_t,
 549                                                              struct c_expr);
 550 extern void mark_exp_read (tree);
 551 extern tree composite_type (tree, tree);
 552 extern tree build_component_ref (location_t, tree, tree);
 553 extern tree build_array_ref (location_t, tree, tree);
 554 extern tree build_external_ref (location_t, tree, int, tree *);
 555 extern void pop_maybe_used (bool);
 556 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 557 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 558 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 559                                             struct c_expr);
 560 extern struct c_expr parser_build_binary_op (location_t,
 561                                              enum tree_code, struct c_expr,
 562                                              struct c_expr);
 563 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 564                                     tree, tree);
 565 extern tree build_compound_expr (location_t, tree, tree);
 566 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 567 extern tree build_c_cast (location_t, tree, tree);
 568 extern void store_init_value (location_t, tree, tree, tree);
 569 extern void error_init (const char *);
 570 extern void pedwarn_init (location_t, int opt, const char *);
 571 extern void maybe_warn_string_init (tree, struct c_expr);
 572 extern void start_init (tree, tree, int);
 573 extern void finish_init (void);
 574 extern void really_start_incremental_init (tree);
 575 extern void push_init_level (int, struct obstack *);
 576 extern struct c_expr pop_init_level (int, struct obstack *);
 577 extern void set_init_index (tree, tree, struct obstack *);
 578 extern void set_init_label (tree, struct obstack *);
 579 extern void process_init_element (struct c_expr, bool, struct obstack *);
 580 extern tree build_compound_literal (location_t, tree, tree, bool);
 581 extern void check_compound_literal_type (location_t, struct c_type_name *);
 582 extern tree c_start_case (location_t, location_t, tree);
 583 extern void c_finish_case (tree);
 584 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 585 extern tree build_asm_stmt (tree, tree);
 586 extern int c_types_compatible_p (tree, tree);
 587 extern tree c_begin_compound_stmt (bool);
 588 extern tree c_end_compound_stmt (location_t, tree, bool);
 589 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 590 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 591 extern tree c_begin_stmt_expr (void);
 592 extern tree c_finish_stmt_expr (location_t, tree);
 593 extern tree c_process_expr_stmt (location_t, tree);
 594 extern tree c_finish_expr_stmt (location_t, tree);
 595 extern tree c_finish_return (location_t, tree, tree);
 596 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 597 extern tree c_finish_goto_label (location_t, tree);
 598 extern tree c_finish_goto_ptr (location_t, tree);
 599 extern tree c_expr_to_decl (tree, bool *, bool *);
 600 extern tree c_begin_omp_parallel (void);
 601 extern tree c_finish_omp_parallel (location_t, tree, tree);
 602 extern tree c_begin_omp_task (void);
 603 extern tree c_finish_omp_task (location_t, tree, tree);
 604 extern tree c_finish_omp_clauses (tree);
 605 extern tree c_build_va_arg (location_t, tree, tree);
 606 extern tree c_finish_transaction (location_t, tree, int);
 607 extern tree c_build_vec_perm_expr (location_t, tree, tree, tree);
 608
 609 /* Set to 0 at beginning of a function definition, set to 1 if
 610    a return statement that specifies a return value is seen.  */
 611
 612 extern int current_function_returns_value;
 613
 614 /* Set to 0 at beginning of a function definition, set to 1 if
 615    a return statement with no argument is seen.  */
 616
 617 extern int current_function_returns_null;
 618
 619 /* Set to 0 at beginning of a function definition, set to 1 if
 620    a call to a noreturn function is seen.  */
 621
 622 extern int current_function_returns_abnormally;
 623
 624 /* Nonzero means we are reading code that came from a system header file.  */
 625
 626 extern int system_header_p;
 627
 628 /* In c-decl.c */
 629 extern void c_finish_incomplete_decl (tree);
 630 extern void c_write_global_declarations (void);
 631
 632 /* In c-errors.c */
 633 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 634 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 635
 636 #endif /* ! GCC_C_TREE_H */