gcc/c/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987-2013 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_C_TREE_H
  21 #define GCC_C_TREE_H
  22
  23 #include "c-family/c-common.h"
  24 #include "diagnostic.h"
  25
  26 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  27    know how big it is.  This is sanity-checked in c-decl.c.  */
  28 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  29   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  30
  31 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  32 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  33
  34 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  35 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  36
  37 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  38    nonzero if the definition of the type has already started.  */
  39 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  40
  41 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  42    declarations whose type would be completed by completing that type.  */
  43 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  44
  45 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  46    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  47    and C_RID_YYCODE is the token number wanted by Yacc.  */
  48 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  49
  50 /* Record whether a type or decl was written with nonconstant size.
  51    Note that TYPE_SIZE may have simplified to a constant.  */
  52 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  53 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  54
  55 /* Record whether a type is defined inside a struct or union type.
  56    This is used for -Wc++-compat. */
  57 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
  58
  59 /* Record whether a typedef for type `int' was actually `signed int'.  */
  60 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  61
  62 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  63    return type.  */
  64 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  65
  66 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  67 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  68
  69 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  70    been declared.  */
  71 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  72   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  73
  74 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  75    built-in prototype and does not have a non-built-in prototype.  */
  76 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  77   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  78
  79 /* Record whether a decl was declared register.  This is strictly a
  80    front-end flag, whereas DECL_REGISTER is used for code generation;
  81    they may differ for structures with volatile fields.  */
  82 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  83
  84 /* Record whether a decl was used in an expression anywhere except an
  85    unevaluated operand of sizeof / typeof / alignof.  This is only
  86    used for functions declared static but not defined, though outside
  87    sizeof and typeof it is set for other function decls as well.  */
  88 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  89
  90 /* Record whether a variable has been declared threadprivate by
  91    #pragma omp threadprivate.  */
  92 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  93
  94 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
  95    N.B. Could be simplified if all built-in decls had complete prototypes
  96    (but this is presently difficult because some of them need FILE*).  */
  97 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
  98        (EXP == 0                                        \
  99         || (!prototype_p (TREE_TYPE (EXP))      \
 100             && !DECL_BUILT_IN (EXP)))
 101
 102 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 103    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 104    without prototypes.  */
 105 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 106
 107 /* For a CONSTRUCTOR, whether some initializer contains a
 108    subexpression meaning it is not a constant expression.  */
 109 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 110
 111 /* Record parser information about an expression that is irrelevant
 112    for code generation alongside a tree representing its value.  */
 113 struct c_expr
 114 {
 115   /* The value of the expression.  */
 116   tree value;
 117   /* Record the original unary/binary operator of an expression, which may
 118      have been changed by fold, STRING_CST for unparenthesized string
 119      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 120      (even if parenthesized), for subexpressions, and for non-constant
 121      initializers, or ERROR_MARK for other expressions (including
 122      parenthesized expressions).  */
 123   enum tree_code original_code;
 124   /* If not NULL, the original type of an expression.  This will
 125      differ from the type of the value field for an enum constant.
 126      The type of an enum constant is a plain integer type, but this
 127      field will be the enum type.  */
 128   tree original_type;
 129 };
 130
 131 /* Type alias for struct c_expr. This allows to use the structure
 132    inside the VEC types.  */
 133 typedef struct c_expr c_expr_t;
 134
 135 /* A varray of c_expr_t.  */
 136
 137 /* Append a new c_expr_t element to V.  */
 138 #define C_EXPR_APPEND(V, ELEM) \
 139   do { \
 140     c_expr_t __elem = (ELEM); \
 141     vec_safe_push (V, __elem); \
 142   } while (0)
 143
 144 /* A kind of type specifier.  Note that this information is currently
 145    only used to distinguish tag definitions, tag references and typeof
 146    uses.  */
 147 enum c_typespec_kind {
 148   /* No typespec.  This appears only in struct c_declspec.  */
 149   ctsk_none,
 150   /* A reserved keyword type specifier.  */
 151   ctsk_resword,
 152   /* A reference to a tag, previously declared, such as "struct foo".
 153      This includes where the previous declaration was as a different
 154      kind of tag, in which case this is only valid if shadowing that
 155      tag in an inner scope.  */
 156   ctsk_tagref,
 157   /* A reference to a tag, not previously declared in a visible
 158      scope.  */
 159   ctsk_tagfirstref,
 160   /* A definition of a tag such as "struct foo { int a; }".  */
 161   ctsk_tagdef,
 162   /* A typedef name.  */
 163   ctsk_typedef,
 164   /* An ObjC-specific kind of type specifier.  */
 165   ctsk_objc,
 166   /* A typeof specifier, or _Atomic ( type-name ).  */
 167   ctsk_typeof
 168 };
 169
 170 /* A type specifier: this structure is created in the parser and
 171    passed to declspecs_add_type only.  */
 172 struct c_typespec {
 173   /* What kind of type specifier this is.  */
 174   enum c_typespec_kind kind;
 175   /* Whether the expression has operands suitable for use in constant
 176      expressions.  */
 177   bool expr_const_operands;
 178   /* The specifier itself.  */
 179   tree spec;
 180   /* An expression to be evaluated before the type specifier, in the
 181      case of typeof specifiers, or NULL otherwise or if no such
 182      expression is required for a particular typeof specifier.  In
 183      particular, when typeof is applied to an expression of variably
 184      modified type, that expression must be evaluated in order to
 185      determine array sizes that form part of the type, but the
 186      expression itself (as opposed to the array sizes) forms no part
 187      of the type and so needs to be recorded separately.  */
 188   tree expr;
 189 };
 190
 191 /* A storage class specifier.  */
 192 enum c_storage_class {
 193   csc_none,
 194   csc_auto,
 195   csc_extern,
 196   csc_register,
 197   csc_static,
 198   csc_typedef
 199 };
 200
 201 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 202    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 203    or none of these.  */
 204 enum c_typespec_keyword {
 205   cts_none,
 206   cts_void,
 207   cts_bool,
 208   cts_char,
 209   cts_int,
 210   cts_float,
 211   cts_int128,
 212   cts_double,
 213   cts_dfloat32,
 214   cts_dfloat64,
 215   cts_dfloat128,
 216   cts_fract,
 217   cts_accum,
 218   cts_auto_type
 219 };
 220
 221 /* This enum lists all the possible declarator specifiers, storage
 222    class or attribute that a user can write.  There is at least one
 223    enumerator per possible declarator specifier in the struct
 224    c_declspecs below.
 225
 226    It is used to index the array of declspec locations in struct
 227    c_declspecs.  */
 228 enum c_declspec_word {
 229   cdw_typespec /* A catch-all for a typespec.  */,
 230   cdw_storage_class  /* A catch-all for a storage class */,
 231   cdw_attributes,
 232   cdw_typedef,
 233   cdw_explicit_signed,
 234   cdw_deprecated,
 235   cdw_default_int,
 236   cdw_long,
 237   cdw_long_long,
 238   cdw_short,
 239   cdw_signed,
 240   cdw_unsigned,
 241   cdw_complex,
 242   cdw_inline,
 243   cdw_noreturn,
 244   cdw_thread,
 245   cdw_const,
 246   cdw_volatile,
 247   cdw_restrict,
 248   cdw_saturating,
 249   cdw_alignas,
 250   cdw_address_space,
 251   cdw_number_of_elements /* This one must always be the last
 252                             enumerator.  */
 253 };
 254
 255 /* A sequence of declaration specifiers in C.  When a new declaration
 256    specifier is added, please update the enum c_declspec_word above
 257    accordingly.  */
 258 struct c_declspecs {
 259   source_location locations[cdw_number_of_elements];
 260   /* The type specified, if a single type specifier such as a struct,
 261      union or enum specifier, typedef name or typeof specifies the
 262      whole type, or NULL_TREE if none or a keyword such as "void" or
 263      "char" is used.  Does not include qualifiers.  */
 264   tree type;
 265   /* Any expression to be evaluated before the type, from a typeof
 266      specifier.  */
 267   tree expr;
 268   /* The attributes from a typedef decl.  */
 269   tree decl_attr;
 270   /* When parsing, the attributes.  Outside the parser, this will be
 271      NULL; attributes (possibly from multiple lists) will be passed
 272      separately.  */
 273   tree attrs;
 274   /* The base-2 log of the greatest alignment required by an _Alignas
 275      specifier, in bytes, or -1 if no such specifiers with nonzero
 276      alignment.  */
 277   int align_log;
 278   /* The storage class specifier, or csc_none if none.  */
 279   enum c_storage_class storage_class;
 280   /* Any type specifier keyword used such as "int", not reflecting
 281      modifiers such as "short", or cts_none if none.  */
 282   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 283   /* The kind of type specifier if one has been seen, ctsk_none
 284      otherwise.  */
 285   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 286   /* Whether any expressions in typeof specifiers may appear in
 287      constant expressions.  */
 288   BOOL_BITFIELD expr_const_operands : 1;
 289   /* Whether any declaration specifiers have been seen at all.  */
 290   BOOL_BITFIELD declspecs_seen_p : 1;
 291   /* Whether something other than a storage class specifier or
 292      attribute has been seen.  This is used to warn for the
 293      obsolescent usage of storage class specifiers other than at the
 294      start of the list.  (Doing this properly would require function
 295      specifiers to be handled separately from storage class
 296      specifiers.)  */
 297   BOOL_BITFIELD non_sc_seen_p : 1;
 298   /* Whether the type is specified by a typedef or typeof name.  */
 299   BOOL_BITFIELD typedef_p : 1;
 300   /* Whether the type is explicitly "signed" or specified by a typedef
 301      whose type is explicitly "signed".  */
 302   BOOL_BITFIELD explicit_signed_p : 1;
 303   /* Whether the specifiers include a deprecated typedef.  */
 304   BOOL_BITFIELD deprecated_p : 1;
 305   /* Whether the type defaulted to "int" because there were no type
 306      specifiers.  */
 307   BOOL_BITFIELD default_int_p : 1;
 308   /* Whether "long" was specified.  */
 309   BOOL_BITFIELD long_p : 1;
 310   /* Whether "long" was specified more than once.  */
 311   BOOL_BITFIELD long_long_p : 1;
 312   /* Whether "short" was specified.  */
 313   BOOL_BITFIELD short_p : 1;
 314   /* Whether "signed" was specified.  */
 315   BOOL_BITFIELD signed_p : 1;
 316   /* Whether "unsigned" was specified.  */
 317   BOOL_BITFIELD unsigned_p : 1;
 318   /* Whether "complex" was specified.  */
 319   BOOL_BITFIELD complex_p : 1;
 320   /* Whether "inline" was specified.  */
 321   BOOL_BITFIELD inline_p : 1;
 322   /* Whether "_Noreturn" was speciied.  */
 323   BOOL_BITFIELD noreturn_p : 1;
 324   /* Whether "__thread" or "_Thread_local" was specified.  */
 325   BOOL_BITFIELD thread_p : 1;
 326   /* Whether "__thread" rather than "_Thread_local" was specified.  */
 327   BOOL_BITFIELD thread_gnu_p : 1;
 328   /* Whether "const" was specified.  */
 329   BOOL_BITFIELD const_p : 1;
 330   /* Whether "volatile" was specified.  */
 331   BOOL_BITFIELD volatile_p : 1;
 332   /* Whether "restrict" was specified.  */
 333   BOOL_BITFIELD restrict_p : 1;
 334   /* Whether "_Atomic" was specified.  */
 335   BOOL_BITFIELD atomic_p : 1;
 336   /* Whether "_Sat" was specified.  */
 337   BOOL_BITFIELD saturating_p : 1;
 338   /* Whether any alignment specifier (even with zero alignment) was
 339      specified.  */
 340   BOOL_BITFIELD alignas_p : 1;
 341   /* The address space that the declaration belongs to.  */
 342   addr_space_t address_space;
 343 };
 344
 345 /* The various kinds of declarators in C.  */
 346 enum c_declarator_kind {
 347   /* An identifier.  */
 348   cdk_id,
 349   /* A function.  */
 350   cdk_function,
 351   /* An array.  */
 352   cdk_array,
 353   /* A pointer.  */
 354   cdk_pointer,
 355   /* Parenthesized declarator with nested attributes.  */
 356   cdk_attrs
 357 };
 358
 359 typedef struct c_arg_tag_d {
 360   /* The argument name.  */
 361   tree id;
 362   /* The type of the argument.  */
 363   tree type;
 364 } c_arg_tag;
 365
 366
 367 /* Information about the parameters in a function declarator.  */
 368 struct c_arg_info {
 369   /* A list of parameter decls.  */
 370   tree parms;
 371   /* A list of structure, union and enum tags defined.  */
 372   vec<c_arg_tag, va_gc> *tags;
 373   /* A list of argument types to go in the FUNCTION_TYPE.  */
 374   tree types;
 375   /* A list of non-parameter decls (notably enumeration constants)
 376      defined with the parameters.  */
 377   tree others;
 378   /* A compound expression of VLA sizes from the parameters, or NULL.
 379      In a function definition, these are used to ensure that
 380      side-effects in sizes of arrays converted to pointers (such as a
 381      parameter int i[n++]) take place; otherwise, they are
 382      ignored.  */
 383   tree pending_sizes;
 384   /* True when these arguments had [*].  */
 385   BOOL_BITFIELD had_vla_unspec : 1;
 386 };
 387
 388 /* A declarator.  */
 389 struct c_declarator {
 390   /* The kind of declarator.  */
 391   enum c_declarator_kind kind;
 392   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 393   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 394   struct c_declarator *declarator;
 395   union {
 396     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 397        declarator.  */
 398     tree id;
 399     /* For functions.  */
 400     struct c_arg_info *arg_info;
 401     /* For arrays.  */
 402     struct {
 403       /* The array dimension, or NULL for [] and [*].  */
 404       tree dimen;
 405       /* The qualifiers inside [].  */
 406       int quals;
 407       /* The attributes (currently ignored) inside [].  */
 408       tree attrs;
 409       /* Whether [static] was used.  */
 410       BOOL_BITFIELD static_p : 1;
 411       /* Whether [*] was used.  */
 412       BOOL_BITFIELD vla_unspec_p : 1;
 413     } array;
 414     /* For pointers, the qualifiers on the pointer type.  */
 415     int pointer_quals;
 416     /* For attributes.  */
 417     tree attrs;
 418   } u;
 419 };
 420
 421 /* A type name.  */
 422 struct c_type_name {
 423   /* The declaration specifiers.  */
 424   struct c_declspecs *specs;
 425   /* The declarator.  */
 426   struct c_declarator *declarator;
 427 };
 428
 429 /* A parameter.  */
 430 struct c_parm {
 431   /* The declaration specifiers, minus any prefix attributes.  */
 432   struct c_declspecs *specs;
 433   /* The attributes.  */
 434   tree attrs;
 435   /* The declarator.  */
 436   struct c_declarator *declarator;
 437 };
 438
 439 /* Used when parsing an enum.  Initialized by start_enum.  */
 440 struct c_enum_contents
 441 {
 442   /* While defining an enum type, this is 1 plus the last enumerator
 443      constant value.  */
 444   tree enum_next_value;
 445
 446   /* Nonzero means that there was overflow computing enum_next_value.  */
 447   int enum_overflow;
 448 };
 449
 450 /* A type of reference to a static identifier in an inline
 451    function.  */
 452 enum c_inline_static_type {
 453   /* Identifier with internal linkage used in function that may be an
 454      inline definition (i.e., file-scope static).  */
 455   csi_internal,
 456   /* Modifiable object with static storage duration defined in
 457      function that may be an inline definition (i.e., local
 458      static).  */
 459   csi_modifiable
 460 };
 461
 462 \f
 463 /* in c-parser.c */
 464 extern void c_parse_init (void);
 465
 466 /* in c-aux-info.c */
 467 extern void gen_aux_info_record (tree, int, int, int);
 468
 469 /* in c-decl.c */
 470 struct c_spot_bindings;
 471 struct c_struct_parse_info;
 472 extern struct obstack parser_obstack;
 473 extern tree c_break_label;
 474 extern tree c_cont_label;
 475
 476 extern bool global_bindings_p (void);
 477 extern void push_scope (void);
 478 extern tree pop_scope (void);
 479 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 480 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 481
 482 extern void record_inline_static (location_t, tree, tree,
 483                                   enum c_inline_static_type);
 484 extern void c_init_decl_processing (void);
 485 extern void c_print_identifier (FILE *, tree, int);
 486 extern int quals_from_declspecs (const struct c_declspecs *);
 487 extern struct c_declarator *build_array_declarator (location_t, tree,
 488                                                     struct c_declspecs *,
 489                                                     bool, bool);
 490 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 491                               tree, tree);
 492 extern tree check_for_loop_decls (location_t, bool);
 493 extern void mark_forward_parm_decls (void);
 494 extern void declare_parm_level (void);
 495 extern void undeclared_variable (location_t, tree);
 496 extern tree lookup_label_for_goto (location_t, tree);
 497 extern tree declare_label (tree);
 498 extern tree define_label (location_t, tree);
 499 extern struct c_spot_bindings *c_get_switch_bindings (void);
 500 extern void c_release_switch_bindings (struct c_spot_bindings *);
 501 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 502                                           location_t, location_t);
 503 extern void finish_decl (tree, location_t, tree, tree, tree);
 504 extern tree finish_enum (tree, tree, tree);
 505 extern void finish_function (void);
 506 extern tree finish_struct (location_t, tree, tree, tree,
 507                            struct c_struct_parse_info *);
 508 extern struct c_arg_info *build_arg_info (void);
 509 extern struct c_arg_info *get_parm_info (bool, tree);
 510 extern tree grokfield (location_t, struct c_declarator *,
 511                        struct c_declspecs *, tree, tree *);
 512 extern tree groktypename (struct c_type_name *, tree *, bool *);
 513 extern tree grokparm (const struct c_parm *, tree *);
 514 extern tree implicitly_declare (location_t, tree);
 515 extern void keep_next_level (void);
 516 extern void pending_xref_error (void);
 517 extern void c_push_function_context (void);
 518 extern void c_pop_function_context (void);
 519 extern void push_parm_decl (const struct c_parm *, tree *);
 520 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 521                                                         struct c_declarator *);
 522 extern tree c_builtin_function (tree);
 523 extern tree c_builtin_function_ext_scope (tree);
 524 extern void shadow_tag (const struct c_declspecs *);
 525 extern void shadow_tag_warned (const struct c_declspecs *, int);
 526 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 527 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 528 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 529                         tree);
 530 extern tree start_struct (location_t, enum tree_code, tree,
 531                           struct c_struct_parse_info **);
 532 extern void store_parm_decls (void);
 533 extern void store_parm_decls_from (struct c_arg_info *);
 534 extern void temp_store_parm_decls (tree, tree);
 535 extern void temp_pop_parm_decls (void);
 536 extern tree xref_tag (enum tree_code, tree);
 537 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 538 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 539                                     struct c_declarator *);
 540 extern struct c_declarator *build_attrs_declarator (tree,
 541                                                     struct c_declarator *);
 542 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 543                                                        struct c_declarator *);
 544 extern struct c_declarator *build_id_declarator (tree);
 545 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 546                                                      struct c_declarator *);
 547 extern struct c_declspecs *build_null_declspecs (void);
 548 extern struct c_declspecs *declspecs_add_qual (source_location,
 549                                                struct c_declspecs *, tree);
 550 extern struct c_declspecs *declspecs_add_type (location_t,
 551                                                struct c_declspecs *,
 552                                                struct c_typespec);
 553 extern struct c_declspecs *declspecs_add_scspec (source_location,
 554                                                  struct c_declspecs *, tree);
 555 extern struct c_declspecs *declspecs_add_attrs (source_location,
 556                                                 struct c_declspecs *, tree);
 557 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 558                                                     struct c_declspecs *,
 559                                                     addr_space_t);
 560 extern struct c_declspecs *declspecs_add_alignas (source_location,
 561                                                   struct c_declspecs *, tree);
 562 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 563
 564 /* in c-objc-common.c */
 565 extern bool c_objc_common_init (void);
 566 extern bool c_missing_noreturn_ok_p (tree);
 567 extern bool c_warn_unused_global_decl (const_tree);
 568 extern void c_initialize_diagnostics (diagnostic_context *);
 569 extern bool c_vla_unspec_p (tree x, tree fn);
 570
 571 /* in c-typeck.c */
 572 extern int in_alignof;
 573 extern int in_sizeof;
 574 extern int in_typeof;
 575
 576 extern tree c_last_sizeof_arg;
 577
 578 extern struct c_switch *c_switch_stack;
 579
 580 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 581 extern tree require_complete_type (tree);
 582 extern int same_translation_unit_p (const_tree, const_tree);
 583 extern int comptypes (tree, tree);
 584 extern int comptypes_check_different_types (tree, tree, bool *);
 585 extern bool c_vla_type_p (const_tree);
 586 extern bool c_mark_addressable (tree);
 587 extern void c_incomplete_type_error (const_tree, const_tree);
 588 extern tree c_type_promotes_to (tree);
 589 extern struct c_expr default_function_array_conversion (location_t,
 590                                                         struct c_expr);
 591 extern struct c_expr default_function_array_read_conversion (location_t,
 592                                                              struct c_expr);
 593 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
 594                                                bool, bool);
 595 extern void mark_exp_read (tree);
 596 extern tree composite_type (tree, tree);
 597 extern tree build_component_ref (location_t, tree, tree);
 598 extern tree build_array_ref (location_t, tree, tree);
 599 extern tree build_external_ref (location_t, tree, int, tree *);
 600 extern void pop_maybe_used (bool);
 601 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 602 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 603 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 604                                             struct c_expr);
 605 extern struct c_expr parser_build_binary_op (location_t,
 606                                              enum tree_code, struct c_expr,
 607                                              struct c_expr);
 608 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 609                                     tree, tree);
 610 extern tree build_compound_expr (location_t, tree, tree);
 611 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 612 extern tree build_c_cast (location_t, tree, tree);
 613 extern void store_init_value (location_t, tree, tree, tree);
 614 extern void error_init (const char *);
 615 extern void pedwarn_init (location_t, int opt, const char *);
 616 extern void maybe_warn_string_init (tree, struct c_expr);
 617 extern void start_init (tree, tree, int);
 618 extern void finish_init (void);
 619 extern void really_start_incremental_init (tree);
 620 extern void push_init_level (int, struct obstack *);
 621 extern struct c_expr pop_init_level (int, struct obstack *);
 622 extern void set_init_index (tree, tree, struct obstack *);
 623 extern void set_init_label (tree, struct obstack *);
 624 extern void process_init_element (struct c_expr, bool, struct obstack *);
 625 extern tree build_compound_literal (location_t, tree, tree, bool);
 626 extern void check_compound_literal_type (location_t, struct c_type_name *);
 627 extern tree c_start_case (location_t, location_t, tree);
 628 extern void c_finish_case (tree);
 629 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 630 extern tree build_asm_stmt (tree, tree);
 631 extern int c_types_compatible_p (tree, tree);
 632 extern tree c_begin_compound_stmt (bool);
 633 extern tree c_end_compound_stmt (location_t, tree, bool);
 634 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 635 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 636 extern tree c_begin_stmt_expr (void);
 637 extern tree c_finish_stmt_expr (location_t, tree);
 638 extern tree c_process_expr_stmt (location_t, tree);
 639 extern tree c_finish_expr_stmt (location_t, tree);
 640 extern tree c_finish_return (location_t, tree, tree);
 641 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 642 extern tree c_finish_goto_label (location_t, tree);
 643 extern tree c_finish_goto_ptr (location_t, tree);
 644 extern tree c_expr_to_decl (tree, bool *, bool *);
 645 extern tree c_begin_omp_parallel (void);
 646 extern tree c_finish_omp_parallel (location_t, tree, tree);
 647 extern tree c_begin_omp_task (void);
 648 extern tree c_finish_omp_task (location_t, tree, tree);
 649 extern void c_finish_omp_cancel (location_t, tree);
 650 extern void c_finish_omp_cancellation_point (location_t, tree);
 651 extern tree c_finish_omp_clauses (tree);
 652 extern tree c_build_va_arg (location_t, tree, tree);
 653 extern tree c_finish_transaction (location_t, tree, int);
 654 extern bool c_tree_equal (tree, tree);
 655
 656 /* Set to 0 at beginning of a function definition, set to 1 if
 657    a return statement that specifies a return value is seen.  */
 658
 659 extern int current_function_returns_value;
 660
 661 /* Set to 0 at beginning of a function definition, set to 1 if
 662    a return statement with no argument is seen.  */
 663
 664 extern int current_function_returns_null;
 665
 666 /* Set to 0 at beginning of a function definition, set to 1 if
 667    a call to a noreturn function is seen.  */
 668
 669 extern int current_function_returns_abnormally;
 670
 671 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 672
 673 extern enum machine_mode c_default_pointer_mode;
 674
 675 /* In c-decl.c */
 676 extern void c_finish_incomplete_decl (tree);
 677 extern void c_write_global_declarations (void);
 678 extern tree c_omp_reduction_id (enum tree_code, tree);
 679 extern tree c_omp_reduction_decl (tree);
 680 extern tree c_omp_reduction_lookup (tree, tree);
 681 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
 682
 683 /* In c-errors.c */
 684 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 685 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 686
 687 #endif /* ! GCC_C_TREE_H */