gcc/c/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987-2014 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 a PARM_DECL, nonzero if it was declared as an array.  */
  70 #define C_ARRAY_PARAMETER(NODE) DECL_LANG_FLAG_0 (NODE)
  71
  72 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  73    been declared.  */
  74 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  75   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  76
  77 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  78    built-in prototype and does not have a non-built-in prototype.  */
  79 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  80   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  81
  82 /* Record whether a decl was declared register.  This is strictly a
  83    front-end flag, whereas DECL_REGISTER is used for code generation;
  84    they may differ for structures with volatile fields.  */
  85 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  86
  87 /* Record whether a decl was used in an expression anywhere except an
  88    unevaluated operand of sizeof / typeof / alignof.  This is only
  89    used for functions declared static but not defined, though outside
  90    sizeof and typeof it is set for other function decls as well.  */
  91 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  92
  93 /* Record whether a variable has been declared threadprivate by
  94    #pragma omp threadprivate.  */
  95 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  96
  97 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
  98    N.B. Could be simplified if all built-in decls had complete prototypes
  99    (but this is presently difficult because some of them need FILE*).  */
 100 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 101        (EXP == 0                                        \
 102         || (!prototype_p (TREE_TYPE (EXP))      \
 103             && !DECL_BUILT_IN (EXP)))
 104
 105 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 106    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 107    without prototypes.  */
 108 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 109
 110 /* For a CONSTRUCTOR, whether some initializer contains a
 111    subexpression meaning it is not a constant expression.  */
 112 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 113
 114 /* Record parser information about an expression that is irrelevant
 115    for code generation alongside a tree representing its value.  */
 116 struct c_expr
 117 {
 118   /* The value of the expression.  */
 119   tree value;
 120   /* Record the original unary/binary operator of an expression, which may
 121      have been changed by fold, STRING_CST for unparenthesized string
 122      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 123      (even if parenthesized), for subexpressions, and for non-constant
 124      initializers, or ERROR_MARK for other expressions (including
 125      parenthesized expressions).  */
 126   enum tree_code original_code;
 127   /* If not NULL, the original type of an expression.  This will
 128      differ from the type of the value field for an enum constant.
 129      The type of an enum constant is a plain integer type, but this
 130      field will be the enum type.  */
 131   tree original_type;
 132 };
 133
 134 /* Type alias for struct c_expr. This allows to use the structure
 135    inside the VEC types.  */
 136 typedef struct c_expr c_expr_t;
 137
 138 /* A kind of type specifier.  Note that this information is currently
 139    only used to distinguish tag definitions, tag references and typeof
 140    uses.  */
 141 enum c_typespec_kind {
 142   /* No typespec.  This appears only in struct c_declspec.  */
 143   ctsk_none,
 144   /* A reserved keyword type specifier.  */
 145   ctsk_resword,
 146   /* A reference to a tag, previously declared, such as "struct foo".
 147      This includes where the previous declaration was as a different
 148      kind of tag, in which case this is only valid if shadowing that
 149      tag in an inner scope.  */
 150   ctsk_tagref,
 151   /* A reference to a tag, not previously declared in a visible
 152      scope.  */
 153   ctsk_tagfirstref,
 154   /* A definition of a tag such as "struct foo { int a; }".  */
 155   ctsk_tagdef,
 156   /* A typedef name.  */
 157   ctsk_typedef,
 158   /* An ObjC-specific kind of type specifier.  */
 159   ctsk_objc,
 160   /* A typeof specifier, or _Atomic ( type-name ).  */
 161   ctsk_typeof
 162 };
 163
 164 /* A type specifier: this structure is created in the parser and
 165    passed to declspecs_add_type only.  */
 166 struct c_typespec {
 167   /* What kind of type specifier this is.  */
 168   enum c_typespec_kind kind;
 169   /* Whether the expression has operands suitable for use in constant
 170      expressions.  */
 171   bool expr_const_operands;
 172   /* The specifier itself.  */
 173   tree spec;
 174   /* An expression to be evaluated before the type specifier, in the
 175      case of typeof specifiers, or NULL otherwise or if no such
 176      expression is required for a particular typeof specifier.  In
 177      particular, when typeof is applied to an expression of variably
 178      modified type, that expression must be evaluated in order to
 179      determine array sizes that form part of the type, but the
 180      expression itself (as opposed to the array sizes) forms no part
 181      of the type and so needs to be recorded separately.  */
 182   tree expr;
 183 };
 184
 185 /* A storage class specifier.  */
 186 enum c_storage_class {
 187   csc_none,
 188   csc_auto,
 189   csc_extern,
 190   csc_register,
 191   csc_static,
 192   csc_typedef
 193 };
 194
 195 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 196    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 197    or none of these.  */
 198 enum c_typespec_keyword {
 199   cts_none,
 200   cts_void,
 201   cts_bool,
 202   cts_char,
 203   cts_int,
 204   cts_float,
 205   cts_int128,
 206   cts_double,
 207   cts_dfloat32,
 208   cts_dfloat64,
 209   cts_dfloat128,
 210   cts_fract,
 211   cts_accum,
 212   cts_auto_type
 213 };
 214
 215 /* This enum lists all the possible declarator specifiers, storage
 216    class or attribute that a user can write.  There is at least one
 217    enumerator per possible declarator specifier in the struct
 218    c_declspecs below.
 219
 220    It is used to index the array of declspec locations in struct
 221    c_declspecs.  */
 222 enum c_declspec_word {
 223   cdw_typespec /* A catch-all for a typespec.  */,
 224   cdw_storage_class  /* A catch-all for a storage class */,
 225   cdw_attributes,
 226   cdw_typedef,
 227   cdw_explicit_signed,
 228   cdw_deprecated,
 229   cdw_default_int,
 230   cdw_long,
 231   cdw_long_long,
 232   cdw_short,
 233   cdw_signed,
 234   cdw_unsigned,
 235   cdw_complex,
 236   cdw_inline,
 237   cdw_noreturn,
 238   cdw_thread,
 239   cdw_const,
 240   cdw_volatile,
 241   cdw_restrict,
 242   cdw_saturating,
 243   cdw_alignas,
 244   cdw_address_space,
 245   cdw_number_of_elements /* This one must always be the last
 246                             enumerator.  */
 247 };
 248
 249 /* A sequence of declaration specifiers in C.  When a new declaration
 250    specifier is added, please update the enum c_declspec_word above
 251    accordingly.  */
 252 struct c_declspecs {
 253   source_location locations[cdw_number_of_elements];
 254   /* The type specified, if a single type specifier such as a struct,
 255      union or enum specifier, typedef name or typeof specifies the
 256      whole type, or NULL_TREE if none or a keyword such as "void" or
 257      "char" is used.  Does not include qualifiers.  */
 258   tree type;
 259   /* Any expression to be evaluated before the type, from a typeof
 260      specifier.  */
 261   tree expr;
 262   /* The attributes from a typedef decl.  */
 263   tree decl_attr;
 264   /* When parsing, the attributes.  Outside the parser, this will be
 265      NULL; attributes (possibly from multiple lists) will be passed
 266      separately.  */
 267   tree attrs;
 268   /* The base-2 log of the greatest alignment required by an _Alignas
 269      specifier, in bytes, or -1 if no such specifiers with nonzero
 270      alignment.  */
 271   int align_log;
 272   /* The storage class specifier, or csc_none if none.  */
 273   enum c_storage_class storage_class;
 274   /* Any type specifier keyword used such as "int", not reflecting
 275      modifiers such as "short", or cts_none if none.  */
 276   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 277   /* The kind of type specifier if one has been seen, ctsk_none
 278      otherwise.  */
 279   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 280   /* Whether any expressions in typeof specifiers may appear in
 281      constant expressions.  */
 282   BOOL_BITFIELD expr_const_operands : 1;
 283   /* Whether any declaration specifiers have been seen at all.  */
 284   BOOL_BITFIELD declspecs_seen_p : 1;
 285   /* Whether something other than a storage class specifier or
 286      attribute has been seen.  This is used to warn for the
 287      obsolescent usage of storage class specifiers other than at the
 288      start of the list.  (Doing this properly would require function
 289      specifiers to be handled separately from storage class
 290      specifiers.)  */
 291   BOOL_BITFIELD non_sc_seen_p : 1;
 292   /* Whether the type is specified by a typedef or typeof name.  */
 293   BOOL_BITFIELD typedef_p : 1;
 294   /* Whether the type is explicitly "signed" or specified by a typedef
 295      whose type is explicitly "signed".  */
 296   BOOL_BITFIELD explicit_signed_p : 1;
 297   /* Whether the specifiers include a deprecated typedef.  */
 298   BOOL_BITFIELD deprecated_p : 1;
 299   /* Whether the type defaulted to "int" because there were no type
 300      specifiers.  */
 301   BOOL_BITFIELD default_int_p : 1;
 302   /* Whether "long" was specified.  */
 303   BOOL_BITFIELD long_p : 1;
 304   /* Whether "long" was specified more than once.  */
 305   BOOL_BITFIELD long_long_p : 1;
 306   /* Whether "short" was specified.  */
 307   BOOL_BITFIELD short_p : 1;
 308   /* Whether "signed" was specified.  */
 309   BOOL_BITFIELD signed_p : 1;
 310   /* Whether "unsigned" was specified.  */
 311   BOOL_BITFIELD unsigned_p : 1;
 312   /* Whether "complex" was specified.  */
 313   BOOL_BITFIELD complex_p : 1;
 314   /* Whether "inline" was specified.  */
 315   BOOL_BITFIELD inline_p : 1;
 316   /* Whether "_Noreturn" was speciied.  */
 317   BOOL_BITFIELD noreturn_p : 1;
 318   /* Whether "__thread" or "_Thread_local" was specified.  */
 319   BOOL_BITFIELD thread_p : 1;
 320   /* Whether "__thread" rather than "_Thread_local" was specified.  */
 321   BOOL_BITFIELD thread_gnu_p : 1;
 322   /* Whether "const" was specified.  */
 323   BOOL_BITFIELD const_p : 1;
 324   /* Whether "volatile" was specified.  */
 325   BOOL_BITFIELD volatile_p : 1;
 326   /* Whether "restrict" was specified.  */
 327   BOOL_BITFIELD restrict_p : 1;
 328   /* Whether "_Atomic" was specified.  */
 329   BOOL_BITFIELD atomic_p : 1;
 330   /* Whether "_Sat" was specified.  */
 331   BOOL_BITFIELD saturating_p : 1;
 332   /* Whether any alignment specifier (even with zero alignment) was
 333      specified.  */
 334   BOOL_BITFIELD alignas_p : 1;
 335   /* The address space that the declaration belongs to.  */
 336   addr_space_t address_space;
 337 };
 338
 339 /* The various kinds of declarators in C.  */
 340 enum c_declarator_kind {
 341   /* An identifier.  */
 342   cdk_id,
 343   /* A function.  */
 344   cdk_function,
 345   /* An array.  */
 346   cdk_array,
 347   /* A pointer.  */
 348   cdk_pointer,
 349   /* Parenthesized declarator with nested attributes.  */
 350   cdk_attrs
 351 };
 352
 353 typedef struct c_arg_tag_d {
 354   /* The argument name.  */
 355   tree id;
 356   /* The type of the argument.  */
 357   tree type;
 358 } c_arg_tag;
 359
 360
 361 /* Information about the parameters in a function declarator.  */
 362 struct c_arg_info {
 363   /* A list of parameter decls.  */
 364   tree parms;
 365   /* A list of structure, union and enum tags defined.  */
 366   vec<c_arg_tag, va_gc> *tags;
 367   /* A list of argument types to go in the FUNCTION_TYPE.  */
 368   tree types;
 369   /* A list of non-parameter decls (notably enumeration constants)
 370      defined with the parameters.  */
 371   tree others;
 372   /* A compound expression of VLA sizes from the parameters, or NULL.
 373      In a function definition, these are used to ensure that
 374      side-effects in sizes of arrays converted to pointers (such as a
 375      parameter int i[n++]) take place; otherwise, they are
 376      ignored.  */
 377   tree pending_sizes;
 378   /* True when these arguments had [*].  */
 379   BOOL_BITFIELD had_vla_unspec : 1;
 380 };
 381
 382 /* A declarator.  */
 383 struct c_declarator {
 384   /* The kind of declarator.  */
 385   enum c_declarator_kind kind;
 386   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 387   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 388   struct c_declarator *declarator;
 389   union {
 390     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 391        declarator.  */
 392     tree id;
 393     /* For functions.  */
 394     struct c_arg_info *arg_info;
 395     /* For arrays.  */
 396     struct {
 397       /* The array dimension, or NULL for [] and [*].  */
 398       tree dimen;
 399       /* The qualifiers inside [].  */
 400       int quals;
 401       /* The attributes (currently ignored) inside [].  */
 402       tree attrs;
 403       /* Whether [static] was used.  */
 404       BOOL_BITFIELD static_p : 1;
 405       /* Whether [*] was used.  */
 406       BOOL_BITFIELD vla_unspec_p : 1;
 407     } array;
 408     /* For pointers, the qualifiers on the pointer type.  */
 409     int pointer_quals;
 410     /* For attributes.  */
 411     tree attrs;
 412   } u;
 413 };
 414
 415 /* A type name.  */
 416 struct c_type_name {
 417   /* The declaration specifiers.  */
 418   struct c_declspecs *specs;
 419   /* The declarator.  */
 420   struct c_declarator *declarator;
 421 };
 422
 423 /* A parameter.  */
 424 struct c_parm {
 425   /* The declaration specifiers, minus any prefix attributes.  */
 426   struct c_declspecs *specs;
 427   /* The attributes.  */
 428   tree attrs;
 429   /* The declarator.  */
 430   struct c_declarator *declarator;
 431 };
 432
 433 /* Used when parsing an enum.  Initialized by start_enum.  */
 434 struct c_enum_contents
 435 {
 436   /* While defining an enum type, this is 1 plus the last enumerator
 437      constant value.  */
 438   tree enum_next_value;
 439
 440   /* Nonzero means that there was overflow computing enum_next_value.  */
 441   int enum_overflow;
 442 };
 443
 444 /* A type of reference to a static identifier in an inline
 445    function.  */
 446 enum c_inline_static_type {
 447   /* Identifier with internal linkage used in function that may be an
 448      inline definition (i.e., file-scope static).  */
 449   csi_internal,
 450   /* Modifiable object with static storage duration defined in
 451      function that may be an inline definition (i.e., local
 452      static).  */
 453   csi_modifiable
 454 };
 455
 456 \f
 457 /* in c-parser.c */
 458 extern void c_parse_init (void);
 459
 460 /* in c-aux-info.c */
 461 extern void gen_aux_info_record (tree, int, int, int);
 462
 463 /* in c-decl.c */
 464 struct c_spot_bindings;
 465 struct c_struct_parse_info;
 466 extern struct obstack parser_obstack;
 467 extern tree c_break_label;
 468 extern tree c_cont_label;
 469
 470 extern bool global_bindings_p (void);
 471 extern void push_scope (void);
 472 extern tree pop_scope (void);
 473 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 474 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 475
 476 extern void record_inline_static (location_t, tree, tree,
 477                                   enum c_inline_static_type);
 478 extern void c_init_decl_processing (void);
 479 extern void c_print_identifier (FILE *, tree, int);
 480 extern int quals_from_declspecs (const struct c_declspecs *);
 481 extern struct c_declarator *build_array_declarator (location_t, tree,
 482                                                     struct c_declspecs *,
 483                                                     bool, bool);
 484 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 485                               tree, tree);
 486 extern tree check_for_loop_decls (location_t, bool);
 487 extern void mark_forward_parm_decls (void);
 488 extern void declare_parm_level (void);
 489 extern void undeclared_variable (location_t, tree);
 490 extern tree lookup_label_for_goto (location_t, tree);
 491 extern tree declare_label (tree);
 492 extern tree define_label (location_t, tree);
 493 extern struct c_spot_bindings *c_get_switch_bindings (void);
 494 extern void c_release_switch_bindings (struct c_spot_bindings *);
 495 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 496                                           location_t, location_t);
 497 extern void finish_decl (tree, location_t, tree, tree, tree);
 498 extern tree finish_enum (tree, tree, tree);
 499 extern void finish_function (void);
 500 extern tree finish_struct (location_t, tree, tree, tree,
 501                            struct c_struct_parse_info *);
 502 extern struct c_arg_info *build_arg_info (void);
 503 extern struct c_arg_info *get_parm_info (bool, tree);
 504 extern tree grokfield (location_t, struct c_declarator *,
 505                        struct c_declspecs *, tree, tree *);
 506 extern tree groktypename (struct c_type_name *, tree *, bool *);
 507 extern tree grokparm (const struct c_parm *, tree *);
 508 extern tree implicitly_declare (location_t, tree);
 509 extern void keep_next_level (void);
 510 extern void pending_xref_error (void);
 511 extern void c_push_function_context (void);
 512 extern void c_pop_function_context (void);
 513 extern void push_parm_decl (const struct c_parm *, tree *);
 514 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 515                                                         struct c_declarator *);
 516 extern tree c_builtin_function (tree);
 517 extern tree c_builtin_function_ext_scope (tree);
 518 extern void shadow_tag (const struct c_declspecs *);
 519 extern void shadow_tag_warned (const struct c_declspecs *, int);
 520 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 521 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 522 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 523                         tree);
 524 extern tree start_struct (location_t, enum tree_code, tree,
 525                           struct c_struct_parse_info **);
 526 extern void store_parm_decls (void);
 527 extern void store_parm_decls_from (struct c_arg_info *);
 528 extern void temp_store_parm_decls (tree, tree);
 529 extern void temp_pop_parm_decls (void);
 530 extern tree xref_tag (enum tree_code, tree);
 531 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 532 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 533                                     struct c_declarator *);
 534 extern struct c_declarator *build_attrs_declarator (tree,
 535                                                     struct c_declarator *);
 536 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 537                                                        struct c_declarator *);
 538 extern struct c_declarator *build_id_declarator (tree);
 539 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 540                                                      struct c_declarator *);
 541 extern struct c_declspecs *build_null_declspecs (void);
 542 extern struct c_declspecs *declspecs_add_qual (source_location,
 543                                                struct c_declspecs *, tree);
 544 extern struct c_declspecs *declspecs_add_type (location_t,
 545                                                struct c_declspecs *,
 546                                                struct c_typespec);
 547 extern struct c_declspecs *declspecs_add_scspec (source_location,
 548                                                  struct c_declspecs *, tree);
 549 extern struct c_declspecs *declspecs_add_attrs (source_location,
 550                                                 struct c_declspecs *, tree);
 551 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 552                                                     struct c_declspecs *,
 553                                                     addr_space_t);
 554 extern struct c_declspecs *declspecs_add_alignas (source_location,
 555                                                   struct c_declspecs *, tree);
 556 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 557
 558 /* in c-objc-common.c */
 559 extern bool c_objc_common_init (void);
 560 extern bool c_missing_noreturn_ok_p (tree);
 561 extern bool c_warn_unused_global_decl (const_tree);
 562 extern void c_initialize_diagnostics (diagnostic_context *);
 563 extern bool c_vla_unspec_p (tree x, tree fn);
 564
 565 /* in c-typeck.c */
 566 extern int in_alignof;
 567 extern int in_sizeof;
 568 extern int in_typeof;
 569
 570 extern tree c_last_sizeof_arg;
 571
 572 extern struct c_switch *c_switch_stack;
 573
 574 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 575 extern tree require_complete_type (tree);
 576 extern int same_translation_unit_p (const_tree, const_tree);
 577 extern int comptypes (tree, tree);
 578 extern int comptypes_check_different_types (tree, tree, bool *);
 579 extern bool c_vla_type_p (const_tree);
 580 extern bool c_mark_addressable (tree);
 581 extern void c_incomplete_type_error (const_tree, const_tree);
 582 extern tree c_type_promotes_to (tree);
 583 extern struct c_expr default_function_array_conversion (location_t,
 584                                                         struct c_expr);
 585 extern struct c_expr default_function_array_read_conversion (location_t,
 586                                                              struct c_expr);
 587 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
 588                                                bool, bool);
 589 extern void mark_exp_read (tree);
 590 extern tree composite_type (tree, tree);
 591 extern tree build_component_ref (location_t, tree, tree);
 592 extern tree build_array_ref (location_t, tree, tree);
 593 extern tree build_external_ref (location_t, tree, int, tree *);
 594 extern void pop_maybe_used (bool);
 595 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 596 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 597 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 598                                             struct c_expr);
 599 extern struct c_expr parser_build_binary_op (location_t,
 600                                              enum tree_code, struct c_expr,
 601                                              struct c_expr);
 602 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 603                                     tree, tree);
 604 extern tree build_compound_expr (location_t, tree, tree);
 605 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 606 extern tree build_c_cast (location_t, tree, tree);
 607 extern void store_init_value (location_t, tree, tree, tree);
 608 extern void maybe_warn_string_init (location_t, tree, struct c_expr);
 609 extern void start_init (tree, tree, int);
 610 extern void finish_init (void);
 611 extern void really_start_incremental_init (tree);
 612 extern void push_init_level (location_t, int, struct obstack *);
 613 extern struct c_expr pop_init_level (location_t, int, struct obstack *);
 614 extern void set_init_index (location_t, tree, tree, struct obstack *);
 615 extern void set_init_label (location_t, tree, struct obstack *);
 616 extern void process_init_element (location_t, struct c_expr, bool,
 617                                   struct obstack *);
 618 extern tree build_compound_literal (location_t, tree, tree, bool);
 619 extern void check_compound_literal_type (location_t, struct c_type_name *);
 620 extern tree c_start_case (location_t, location_t, tree, bool);
 621 extern void c_finish_case (tree);
 622 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 623 extern tree build_asm_stmt (tree, tree);
 624 extern int c_types_compatible_p (tree, tree);
 625 extern tree c_begin_compound_stmt (bool);
 626 extern tree c_end_compound_stmt (location_t, tree, bool);
 627 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 628 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 629 extern tree c_begin_stmt_expr (void);
 630 extern tree c_finish_stmt_expr (location_t, tree);
 631 extern tree c_process_expr_stmt (location_t, tree);
 632 extern tree c_finish_expr_stmt (location_t, tree);
 633 extern tree c_finish_return (location_t, tree, tree);
 634 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 635 extern tree c_finish_goto_label (location_t, tree);
 636 extern tree c_finish_goto_ptr (location_t, tree);
 637 extern tree c_expr_to_decl (tree, bool *, bool *);
 638 extern tree c_begin_omp_parallel (void);
 639 extern tree c_finish_omp_parallel (location_t, tree, tree);
 640 extern tree c_begin_omp_task (void);
 641 extern tree c_finish_omp_task (location_t, tree, tree);
 642 extern void c_finish_omp_cancel (location_t, tree);
 643 extern void c_finish_omp_cancellation_point (location_t, tree);
 644 extern tree c_finish_omp_clauses (tree);
 645 extern tree c_build_va_arg (location_t, tree, tree);
 646 extern tree c_finish_transaction (location_t, tree, int);
 647 extern bool c_tree_equal (tree, tree);
 648 extern tree c_build_function_call_vec (location_t, vec<location_t>, tree,
 649                                        vec<tree, va_gc> *, vec<tree, va_gc> *);
 650
 651 /* Set to 0 at beginning of a function definition, set to 1 if
 652    a return statement that specifies a return value is seen.  */
 653
 654 extern int current_function_returns_value;
 655
 656 /* Set to 0 at beginning of a function definition, set to 1 if
 657    a return statement with no argument is seen.  */
 658
 659 extern int current_function_returns_null;
 660
 661 /* Set to 0 at beginning of a function definition, set to 1 if
 662    a call to a noreturn function is seen.  */
 663
 664 extern int current_function_returns_abnormally;
 665
 666 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 667
 668 extern enum machine_mode c_default_pointer_mode;
 669
 670 /* In c-decl.c */
 671 extern void c_finish_incomplete_decl (tree);
 672 extern void c_write_global_declarations (void);
 673 extern tree c_omp_reduction_id (enum tree_code, tree);
 674 extern tree c_omp_reduction_decl (tree);
 675 extern tree c_omp_reduction_lookup (tree, tree);
 676 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
 677
 678 /* In c-errors.c */
 679 extern void pedwarn_c90 (location_t, int opt, const char *, ...)
 680     ATTRIBUTE_GCC_DIAG(3,4);
 681 extern bool pedwarn_c99 (location_t, int opt, const char *, ...)
 682     ATTRIBUTE_GCC_DIAG(3,4);
 683
 684 #endif /* ! GCC_C_TREE_H */