gcc/c/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987-2015 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 an "incomplete type" error was given for the type.  */
  60 #define C_TYPE_ERROR_REPORTED(TYPE) TYPE_LANG_FLAG_3 (TYPE)
  61
  62 /* Record whether a typedef for type `int' was actually `signed int'.  */
  63 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  64
  65 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  66    return type.  */
  67 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  68
  69 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  70 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  71
  72 /* For a PARM_DECL, nonzero if it was declared as an array.  */
  73 #define C_ARRAY_PARAMETER(NODE) DECL_LANG_FLAG_0 (NODE)
  74
  75 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  76    been declared.  */
  77 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  78   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  79
  80 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  81    built-in prototype and does not have a non-built-in prototype.  */
  82 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  83   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  84
  85 /* Record whether a decl was declared register.  This is strictly a
  86    front-end flag, whereas DECL_REGISTER is used for code generation;
  87    they may differ for structures with volatile fields.  */
  88 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  89
  90 /* Record whether a decl was used in an expression anywhere except an
  91    unevaluated operand of sizeof / typeof / alignof.  This is only
  92    used for functions declared static but not defined, though outside
  93    sizeof and typeof it is set for other function decls as well.  */
  94 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  95
  96 /* Record whether a variable has been declared threadprivate by
  97    #pragma omp threadprivate.  */
  98 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  99
 100 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 101    N.B. Could be simplified if all built-in decls had complete prototypes
 102    (but this is presently difficult because some of them need FILE*).  */
 103 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 104        (EXP == 0                                        \
 105         || (!prototype_p (TREE_TYPE (EXP))      \
 106             && !DECL_BUILT_IN (EXP)))
 107
 108 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 109    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 110    without prototypes.  */
 111 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 112
 113 /* For a CONSTRUCTOR, whether some initializer contains a
 114    subexpression meaning it is not a constant expression.  */
 115 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 116
 117 /* Record parser information about an expression that is irrelevant
 118    for code generation alongside a tree representing its value.  */
 119 struct c_expr
 120 {
 121   /* The value of the expression.  */
 122   tree value;
 123   /* Record the original unary/binary operator of an expression, which may
 124      have been changed by fold, STRING_CST for unparenthesized string
 125      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 126      (even if parenthesized), for subexpressions, and for non-constant
 127      initializers, or ERROR_MARK for other expressions (including
 128      parenthesized expressions).  */
 129   enum tree_code original_code;
 130   /* If not NULL, the original type of an expression.  This will
 131      differ from the type of the value field for an enum constant.
 132      The type of an enum constant is a plain integer type, but this
 133      field will be the enum type.  */
 134   tree original_type;
 135 };
 136
 137 /* Type alias for struct c_expr. This allows to use the structure
 138    inside the VEC types.  */
 139 typedef struct c_expr c_expr_t;
 140
 141 /* A kind of type specifier.  Note that this information is currently
 142    only used to distinguish tag definitions, tag references and typeof
 143    uses.  */
 144 enum c_typespec_kind {
 145   /* No typespec.  This appears only in struct c_declspec.  */
 146   ctsk_none,
 147   /* A reserved keyword type specifier.  */
 148   ctsk_resword,
 149   /* A reference to a tag, previously declared, such as "struct foo".
 150      This includes where the previous declaration was as a different
 151      kind of tag, in which case this is only valid if shadowing that
 152      tag in an inner scope.  */
 153   ctsk_tagref,
 154   /* A reference to a tag, not previously declared in a visible
 155      scope.  */
 156   ctsk_tagfirstref,
 157   /* A definition of a tag such as "struct foo { int a; }".  */
 158   ctsk_tagdef,
 159   /* A typedef name.  */
 160   ctsk_typedef,
 161   /* An ObjC-specific kind of type specifier.  */
 162   ctsk_objc,
 163   /* A typeof specifier, or _Atomic ( type-name ).  */
 164   ctsk_typeof
 165 };
 166
 167 /* A type specifier: this structure is created in the parser and
 168    passed to declspecs_add_type only.  */
 169 struct c_typespec {
 170   /* What kind of type specifier this is.  */
 171   enum c_typespec_kind kind;
 172   /* Whether the expression has operands suitable for use in constant
 173      expressions.  */
 174   bool expr_const_operands;
 175   /* The specifier itself.  */
 176   tree spec;
 177   /* An expression to be evaluated before the type specifier, in the
 178      case of typeof specifiers, or NULL otherwise or if no such
 179      expression is required for a particular typeof specifier.  In
 180      particular, when typeof is applied to an expression of variably
 181      modified type, that expression must be evaluated in order to
 182      determine array sizes that form part of the type, but the
 183      expression itself (as opposed to the array sizes) forms no part
 184      of the type and so needs to be recorded separately.  */
 185   tree expr;
 186 };
 187
 188 /* A storage class specifier.  */
 189 enum c_storage_class {
 190   csc_none,
 191   csc_auto,
 192   csc_extern,
 193   csc_register,
 194   csc_static,
 195   csc_typedef
 196 };
 197
 198 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 199    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 200    or none of these.  */
 201 enum c_typespec_keyword {
 202   cts_none,
 203   cts_void,
 204   cts_bool,
 205   cts_char,
 206   cts_int,
 207   cts_float,
 208   cts_int_n,
 209   cts_double,
 210   cts_dfloat32,
 211   cts_dfloat64,
 212   cts_dfloat128,
 213   cts_fract,
 214   cts_accum,
 215   cts_auto_type
 216 };
 217
 218 /* This enum lists all the possible declarator specifiers, storage
 219    class or attribute that a user can write.  There is at least one
 220    enumerator per possible declarator specifier in the struct
 221    c_declspecs below.
 222
 223    It is used to index the array of declspec locations in struct
 224    c_declspecs.  */
 225 enum c_declspec_word {
 226   cdw_typespec /* A catch-all for a typespec.  */,
 227   cdw_storage_class  /* A catch-all for a storage class */,
 228   cdw_attributes,
 229   cdw_typedef,
 230   cdw_explicit_signed,
 231   cdw_deprecated,
 232   cdw_default_int,
 233   cdw_long,
 234   cdw_long_long,
 235   cdw_short,
 236   cdw_signed,
 237   cdw_unsigned,
 238   cdw_complex,
 239   cdw_inline,
 240   cdw_noreturn,
 241   cdw_thread,
 242   cdw_const,
 243   cdw_volatile,
 244   cdw_restrict,
 245   cdw_saturating,
 246   cdw_alignas,
 247   cdw_address_space,
 248   cdw_number_of_elements /* This one must always be the last
 249                             enumerator.  */
 250 };
 251
 252 /* A sequence of declaration specifiers in C.  When a new declaration
 253    specifier is added, please update the enum c_declspec_word above
 254    accordingly.  */
 255 struct c_declspecs {
 256   source_location locations[cdw_number_of_elements];
 257   /* The type specified, if a single type specifier such as a struct,
 258      union or enum specifier, typedef name or typeof specifies the
 259      whole type, or NULL_TREE if none or a keyword such as "void" or
 260      "char" is used.  Does not include qualifiers.  */
 261   tree type;
 262   /* Any expression to be evaluated before the type, from a typeof
 263      specifier.  */
 264   tree expr;
 265   /* The attributes from a typedef decl.  */
 266   tree decl_attr;
 267   /* When parsing, the attributes.  Outside the parser, this will be
 268      NULL; attributes (possibly from multiple lists) will be passed
 269      separately.  */
 270   tree attrs;
 271   /* For UPC, this is the blocking factor (layout qualifier).
 272      For example, shared [10] int x;  */
 273   tree upc_layout_qualifier;
 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   /* For the __intN declspec, this stores the index into the int_n_* arrays.  */
 279   int int_n_idx;
 280   /* The storage class specifier, or csc_none if none.  */
 281   enum c_storage_class storage_class;
 282   /* Any type specifier keyword used such as "int", not reflecting
 283      modifiers such as "short", or cts_none if none.  */
 284   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 285   /* The kind of type specifier if one has been seen, ctsk_none
 286      otherwise.  */
 287   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 288   /* Whether any expressions in typeof specifiers may appear in
 289      constant expressions.  */
 290   BOOL_BITFIELD expr_const_operands : 1;
 291   /* Whether any declaration specifiers have been seen at all.  */
 292   BOOL_BITFIELD declspecs_seen_p : 1;
 293   /* Whether something other than a storage class specifier or
 294      attribute has been seen.  This is used to warn for the
 295      obsolescent usage of storage class specifiers other than at the
 296      start of the list.  (Doing this properly would require function
 297      specifiers to be handled separately from storage class
 298      specifiers.)  */
 299   BOOL_BITFIELD non_sc_seen_p : 1;
 300   /* Whether the type is specified by a typedef or typeof name.  */
 301   BOOL_BITFIELD typedef_p : 1;
 302   /* Whether the type is explicitly "signed" or specified by a typedef
 303      whose type is explicitly "signed".  */
 304   BOOL_BITFIELD explicit_signed_p : 1;
 305   /* Whether the specifiers include a deprecated typedef.  */
 306   BOOL_BITFIELD deprecated_p : 1;
 307   /* Whether the type defaulted to "int" because there were no type
 308      specifiers.  */
 309   BOOL_BITFIELD default_int_p : 1;
 310   /* Whether "long" was specified.  */
 311   BOOL_BITFIELD long_p : 1;
 312   /* Whether "long" was specified more than once.  */
 313   BOOL_BITFIELD long_long_p : 1;
 314   /* Whether "short" was specified.  */
 315   BOOL_BITFIELD short_p : 1;
 316   /* Whether "signed" was specified.  */
 317   BOOL_BITFIELD signed_p : 1;
 318   /* Whether "unsigned" was specified.  */
 319   BOOL_BITFIELD unsigned_p : 1;
 320   /* Whether "complex" was specified.  */
 321   BOOL_BITFIELD complex_p : 1;
 322   /* Whether "inline" was specified.  */
 323   BOOL_BITFIELD inline_p : 1;
 324   /* Whether "_Noreturn" was speciied.  */
 325   BOOL_BITFIELD noreturn_p : 1;
 326   /* Whether "__thread" or "_Thread_local" was specified.  */
 327   BOOL_BITFIELD thread_p : 1;
 328   /* Whether "__thread" rather than "_Thread_local" was specified.  */
 329   BOOL_BITFIELD thread_gnu_p : 1;
 330   /* Whether "const" was specified.  */
 331   BOOL_BITFIELD const_p : 1;
 332   /* Whether "volatile" was specified.  */
 333   BOOL_BITFIELD volatile_p : 1;
 334   /* Whether "restrict" was specified.  */
 335   BOOL_BITFIELD restrict_p : 1;
 336   /* Whether "_Atomic" was specified.  */
 337   BOOL_BITFIELD atomic_p : 1;
 338   /* Whether "_Sat" was specified.  */
 339   BOOL_BITFIELD saturating_p : 1;
 340   /* Whether "shared" was specified.  */
 341   BOOL_BITFIELD shared_p : 1;
 342   /* Whether "strict" was specified.  */
 343   BOOL_BITFIELD strict_p : 1;
 344   /* Whether "relaxed" was specified.  */
 345   BOOL_BITFIELD relaxed_p : 1;
 346   /* Whether any alignment specifier (even with zero alignment) was
 347      specified.  */
 348   BOOL_BITFIELD alignas_p : 1;
 349   /* The address space that the declaration belongs to.  */
 350   addr_space_t address_space;
 351 };
 352
 353 /* The various kinds of declarators in C.  */
 354 enum c_declarator_kind {
 355   /* An identifier.  */
 356   cdk_id,
 357   /* A function.  */
 358   cdk_function,
 359   /* An array.  */
 360   cdk_array,
 361   /* A pointer.  */
 362   cdk_pointer,
 363   /* Parenthesized declarator with nested attributes.  */
 364   cdk_attrs
 365 };
 366
 367 typedef struct c_arg_tag_d {
 368   /* The argument name.  */
 369   tree id;
 370   /* The type of the argument.  */
 371   tree type;
 372 } c_arg_tag;
 373
 374
 375 /* Information about the parameters in a function declarator.  */
 376 struct c_arg_info {
 377   /* A list of parameter decls.  */
 378   tree parms;
 379   /* A list of structure, union and enum tags defined.  */
 380   vec<c_arg_tag, va_gc> *tags;
 381   /* A list of argument types to go in the FUNCTION_TYPE.  */
 382   tree types;
 383   /* A list of non-parameter decls (notably enumeration constants)
 384      defined with the parameters.  */
 385   tree others;
 386   /* A compound expression of VLA sizes from the parameters, or NULL.
 387      In a function definition, these are used to ensure that
 388      side-effects in sizes of arrays converted to pointers (such as a
 389      parameter int i[n++]) take place; otherwise, they are
 390      ignored.  */
 391   tree pending_sizes;
 392   /* True when these arguments had [*].  */
 393   BOOL_BITFIELD had_vla_unspec : 1;
 394 };
 395
 396 /* A declarator.  */
 397 struct c_declarator {
 398   /* The kind of declarator.  */
 399   enum c_declarator_kind kind;
 400   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 401   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 402   struct c_declarator *declarator;
 403   union {
 404     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 405        declarator.  */
 406     tree id;
 407     /* For functions.  */
 408     struct c_arg_info *arg_info;
 409     /* For arrays.  */
 410     struct {
 411       /* The array dimension, or NULL for [] and [*].  */
 412       tree dimen;
 413       /* The qualifiers inside [].  */
 414       int quals;
 415       /* The attributes (currently ignored) inside [].  */
 416       tree attrs;
 417       /* Whether [static] was used.  */
 418       BOOL_BITFIELD static_p : 1;
 419       /* Whether [*] was used.  */
 420       BOOL_BITFIELD vla_unspec_p : 1;
 421     } array;
 422     /* For pointers, the qualifiers on the pointer type.  */
 423     struct {
 424       int quals;
 425       tree upc_layout_qual;
 426     } pointer;
 427     /* For attributes.  */
 428     tree attrs;
 429   } u;
 430 };
 431
 432 /* A type name.  */
 433 struct c_type_name {
 434   /* The declaration specifiers.  */
 435   struct c_declspecs *specs;
 436   /* The declarator.  */
 437   struct c_declarator *declarator;
 438 };
 439
 440 /* A parameter.  */
 441 struct c_parm {
 442   /* The declaration specifiers, minus any prefix attributes.  */
 443   struct c_declspecs *specs;
 444   /* The attributes.  */
 445   tree attrs;
 446   /* The declarator.  */
 447   struct c_declarator *declarator;
 448 };
 449
 450 /* Used when parsing an enum.  Initialized by start_enum.  */
 451 struct c_enum_contents
 452 {
 453   /* While defining an enum type, this is 1 plus the last enumerator
 454      constant value.  */
 455   tree enum_next_value;
 456
 457   /* Nonzero means that there was overflow computing enum_next_value.  */
 458   int enum_overflow;
 459 };
 460
 461 /* A type of reference to a static identifier in an inline
 462    function.  */
 463 enum c_inline_static_type {
 464   /* Identifier with internal linkage used in function that may be an
 465      inline definition (i.e., file-scope static).  */
 466   csi_internal,
 467   /* Modifiable object with static storage duration defined in
 468      function that may be an inline definition (i.e., local
 469      static).  */
 470   csi_modifiable
 471 };
 472
 473 \f
 474 /* in c-parser.c */
 475 extern void c_parse_init (void);
 476
 477 /* in c-aux-info.c */
 478 extern void gen_aux_info_record (tree, int, int, int);
 479
 480 /* in c-decl.c */
 481 struct c_spot_bindings;
 482 struct c_struct_parse_info;
 483 extern struct obstack parser_obstack;
 484 extern tree c_break_label;
 485 extern tree c_cont_label;
 486
 487 extern bool global_bindings_p (void);
 488 extern void push_scope (void);
 489 extern tree pop_scope (void);
 490 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 491 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 492
 493 extern void record_inline_static (location_t, tree, tree,
 494                                   enum c_inline_static_type);
 495 extern void c_init_decl_processing (void);
 496 extern void c_print_identifier (FILE *, tree, int);
 497 extern int quals_from_declspecs (const struct c_declspecs *);
 498 extern struct c_declarator *build_array_declarator (location_t, tree,
 499                                                     struct c_declspecs *,
 500                                                     bool, bool);
 501 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 502                               tree, tree);
 503 extern tree check_for_loop_decls (location_t, bool);
 504 extern void mark_forward_parm_decls (void);
 505 extern void declare_parm_level (void);
 506 extern void undeclared_variable (location_t, tree);
 507 extern tree lookup_label_for_goto (location_t, tree);
 508 extern tree declare_label (tree);
 509 extern tree define_label (location_t, tree);
 510 extern struct c_spot_bindings *c_get_switch_bindings (void);
 511 extern void c_release_switch_bindings (struct c_spot_bindings *);
 512 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 513                                           location_t, location_t);
 514 extern void finish_decl (tree, location_t, tree, tree, tree);
 515 extern tree finish_enum (tree, tree, tree);
 516 extern void finish_function (void);
 517 extern tree finish_struct (location_t, tree, tree, tree,
 518                            struct c_struct_parse_info *);
 519 extern struct c_arg_info *build_arg_info (void);
 520 extern struct c_arg_info *get_parm_info (bool, tree);
 521 extern tree grokfield (location_t, struct c_declarator *,
 522                        struct c_declspecs *, tree, tree *);
 523 extern tree groktypename (struct c_type_name *, tree *, bool *);
 524 extern tree grokparm (const struct c_parm *, tree *);
 525 extern tree implicitly_declare (location_t, tree);
 526 extern void keep_next_level (void);
 527 extern void pending_xref_error (void);
 528 extern void c_push_function_context (void);
 529 extern void c_pop_function_context (void);
 530 extern void push_parm_decl (const struct c_parm *, tree *);
 531 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 532                                                         struct c_declarator *);
 533 extern tree c_builtin_function (tree);
 534 extern tree c_builtin_function_ext_scope (tree);
 535 extern void shadow_tag (const struct c_declspecs *);
 536 extern void shadow_tag_warned (const struct c_declspecs *, int);
 537 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 538 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 539 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 540                         tree);
 541 extern tree start_struct (location_t, enum tree_code, tree,
 542                           struct c_struct_parse_info **);
 543 extern void store_parm_decls (void);
 544 extern void store_parm_decls_from (struct c_arg_info *);
 545 extern void temp_store_parm_decls (tree, tree);
 546 extern void temp_pop_parm_decls (void);
 547 extern tree xref_tag (enum tree_code, tree);
 548 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 549 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 550                                     struct c_declarator *);
 551 extern struct c_declarator *build_attrs_declarator (tree,
 552                                                     struct c_declarator *);
 553 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 554                                                        struct c_declarator *);
 555 extern struct c_declarator *build_id_declarator (tree);
 556 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 557                                                      struct c_declarator *);
 558 extern struct c_declspecs *build_null_declspecs (void);
 559 extern struct c_declspecs *declspecs_add_qual (source_location,
 560                                                struct c_declspecs *, tree);
 561 extern struct c_declspecs *declspecs_add_type (location_t,
 562                                                struct c_declspecs *,
 563                                                struct c_typespec);
 564 extern struct c_declspecs *declspecs_add_scspec (source_location,
 565                                                  struct c_declspecs *, tree);
 566 extern struct c_declspecs *declspecs_add_attrs (source_location,
 567                                                 struct c_declspecs *, tree);
 568 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 569                                                     struct c_declspecs *,
 570                                                     addr_space_t);
 571 extern struct c_declspecs *declspecs_add_alignas (source_location,
 572                                                   struct c_declspecs *, tree);
 573 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 574
 575 /* in c-objc-common.c */
 576 extern bool c_objc_common_init (void);
 577 extern bool c_missing_noreturn_ok_p (tree);
 578 extern bool c_warn_unused_global_decl (const_tree);
 579 extern void c_initialize_diagnostics (diagnostic_context *);
 580 extern bool c_vla_unspec_p (tree x, tree fn);
 581
 582 /* in c-typeck.c */
 583 extern int in_alignof;
 584 extern int in_sizeof;
 585 extern int in_typeof;
 586
 587 extern tree c_last_sizeof_arg;
 588
 589 extern struct c_switch *c_switch_stack;
 590
 591 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 592 extern tree require_complete_type (tree);
 593 extern int same_translation_unit_p (const_tree, const_tree);
 594 extern int comptypes (tree, tree);
 595 extern int comptypes_check_different_types (tree, tree, bool *);
 596 extern bool c_vla_type_p (const_tree);
 597 extern bool c_mark_addressable (tree);
 598 extern void c_incomplete_type_error (const_tree, const_tree);
 599 extern tree c_type_promotes_to (tree);
 600 extern struct c_expr default_function_array_conversion (location_t,
 601                                                         struct c_expr);
 602 extern struct c_expr default_function_array_read_conversion (location_t,
 603                                                              struct c_expr);
 604 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
 605                                                bool, bool);
 606 extern void mark_exp_read (tree);
 607 extern tree composite_type (tree, tree);
 608 extern tree build_component_ref (location_t, tree, tree);
 609 extern tree build_array_ref (location_t, tree, tree);
 610 extern tree build_external_ref (location_t, tree, int, tree *);
 611 extern void pop_maybe_used (bool);
 612 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 613 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 614 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 615                                             struct c_expr);
 616 extern struct c_expr parser_build_binary_op (location_t,
 617                                              enum tree_code, struct c_expr,
 618                                              struct c_expr);
 619 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 620                                     tree, tree);
 621 extern tree build_compound_expr (location_t, tree, tree);
 622 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 623 extern tree build_c_cast (location_t, tree, tree);
 624 extern void store_init_value (location_t, tree, tree, tree);
 625 extern void maybe_warn_string_init (location_t, tree, struct c_expr);
 626 extern void start_init (tree, tree, int);
 627 extern void finish_init (void);
 628 extern void really_start_incremental_init (tree);
 629 extern void push_init_level (location_t, int, struct obstack *);
 630 extern struct c_expr pop_init_level (location_t, int, struct obstack *);
 631 extern void set_init_index (location_t, tree, tree, struct obstack *);
 632 extern void set_init_label (location_t, tree, struct obstack *);
 633 extern void process_init_element (location_t, struct c_expr, bool,
 634                                   struct obstack *);
 635 extern tree build_compound_literal (location_t, tree, tree, bool);
 636 extern void check_compound_literal_type (location_t, struct c_type_name *);
 637 extern tree c_start_case (location_t, location_t, tree, bool);
 638 extern void c_finish_case (tree, tree);
 639 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 640 extern tree build_asm_stmt (tree, tree);
 641 extern int c_types_compatible_p (tree, tree);
 642 extern tree c_begin_compound_stmt (bool);
 643 extern tree c_end_compound_stmt (location_t, tree, bool);
 644 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 645 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 646 extern tree c_begin_stmt_expr (void);
 647 extern tree c_finish_stmt_expr (location_t, tree);
 648 extern tree c_process_expr_stmt (location_t, tree);
 649 extern tree c_finish_expr_stmt (location_t, tree);
 650 extern tree c_finish_return (location_t, tree, tree);
 651 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 652 extern tree c_finish_goto_label (location_t, tree);
 653 extern tree c_finish_goto_ptr (location_t, tree);
 654 extern tree c_expr_to_decl (tree, bool *, bool *);
 655 extern tree c_finish_oacc_parallel (location_t, tree, tree);
 656 extern tree c_finish_oacc_kernels (location_t, tree, tree);
 657 extern tree c_finish_oacc_data (location_t, tree, tree);
 658 extern tree c_begin_omp_parallel (void);
 659 extern tree c_finish_omp_parallel (location_t, tree, tree);
 660 extern tree c_begin_omp_task (void);
 661 extern tree c_finish_omp_task (location_t, tree, tree);
 662 extern void c_finish_omp_cancel (location_t, tree);
 663 extern void c_finish_omp_cancellation_point (location_t, tree);
 664 extern tree c_finish_omp_clauses (tree);
 665 extern tree c_build_va_arg (location_t, tree, tree);
 666 extern tree c_finish_transaction (location_t, tree, int);
 667 extern tree c_cvt_expr_for_assign (location_t, tree, tree);
 668 extern bool c_tree_equal (tree, tree);
 669 extern tree c_build_function_call_vec (location_t, vec<location_t>, tree,
 670                                        vec<tree, va_gc> *, vec<tree, va_gc> *);
 671
 672 /* Set to 0 at beginning of a function definition, set to 1 if
 673    a return statement that specifies a return value is seen.  */
 674
 675 extern int current_function_returns_value;
 676
 677 /* Set to 0 at beginning of a function definition, set to 1 if
 678    a return statement with no argument is seen.  */
 679
 680 extern int current_function_returns_null;
 681
 682 /* Set to 0 at beginning of a function definition, set to 1 if
 683    a call to a noreturn function is seen.  */
 684
 685 extern int current_function_returns_abnormally;
 686
 687 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 688
 689 extern machine_mode c_default_pointer_mode;
 690
 691 /* In c-decl.c */
 692
 693 /* Tell the binding oracle what kind of binding we are looking for.  */
 694
 695 enum c_oracle_request
 696 {
 697   C_ORACLE_SYMBOL,
 698   C_ORACLE_TAG,
 699   C_ORACLE_LABEL
 700 };
 701
 702 /* If this is non-NULL, then it is a "binding oracle" which can lazily
 703    create bindings when needed by the C compiler.  The oracle is told
 704    the name and type of the binding to create.  It can call pushdecl
 705    or the like to ensure the binding is visible; or do nothing,
 706    leaving the binding untouched.  c-decl.c takes note of when the
 707    oracle has been called and will not call it again if it fails to
 708    create a given binding.  */
 709
 710 typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier);
 711
 712 extern c_binding_oracle_function *c_binding_oracle;
 713
 714 extern void c_finish_incomplete_decl (tree);
 715 extern void c_write_global_declarations (void);
 716 extern tree c_omp_reduction_id (enum tree_code, tree);
 717 extern tree c_omp_reduction_decl (tree);
 718 extern tree c_omp_reduction_lookup (tree, tree);
 719 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
 720 extern void c_pushtag (location_t, tree, tree);
 721 extern void c_bind (location_t, tree, bool);
 722
 723 /* In c-errors.c */
 724 extern void pedwarn_c90 (location_t, int opt, const char *, ...)
 725     ATTRIBUTE_GCC_DIAG(3,4);
 726 extern bool pedwarn_c99 (location_t, int opt, const char *, ...)
 727     ATTRIBUTE_GCC_DIAG(3,4);
 728
 729 #endif /* ! GCC_C_TREE_H */