gcc/c/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_C_TREE_H
  23 #define GCC_C_TREE_H
  24
  25 #include "c-family/c-common.h"
  26 #include "diagnostic.h"
  27
  28 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  29    know how big it is.  This is sanity-checked in c-decl.c.  */
  30 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  31   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  32
  33 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  34 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  35
  36 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  37 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  38
  39 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  40    nonzero if the definition of the type has already started.  */
  41 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  42
  43 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  44    declarations whose type would be completed by completing that type.  */
  45 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  46
  47 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  48    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  49    and C_RID_YYCODE is the token number wanted by Yacc.  */
  50 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  51
  52 /* Record whether a type or decl was written with nonconstant size.
  53    Note that TYPE_SIZE may have simplified to a constant.  */
  54 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  55 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  56
  57 /* Record whether a type is defined inside a struct or union type.
  58    This is used for -Wc++-compat. */
  59 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
  60
  61 /* Record whether a typedef for type `int' was actually `signed int'.  */
  62 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  63
  64 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  65    return type.  */
  66 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  67
  68 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  69 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  70
  71 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  72    been declared.  */
  73 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  74   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  75
  76 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  77    built-in prototype and does not have a non-built-in prototype.  */
  78 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  79   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  80
  81 /* Record whether a decl was declared register.  This is strictly a
  82    front-end flag, whereas DECL_REGISTER is used for code generation;
  83    they may differ for structures with volatile fields.  */
  84 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  85
  86 /* Record whether a decl was used in an expression anywhere except an
  87    unevaluated operand of sizeof / typeof / alignof.  This is only
  88    used for functions declared static but not defined, though outside
  89    sizeof and typeof it is set for other function decls as well.  */
  90 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  91
  92 /* Record whether a variable has been declared threadprivate by
  93    #pragma omp threadprivate.  */
  94 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  95
  96 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
  97    N.B. Could be simplified if all built-in decls had complete prototypes
  98    (but this is presently difficult because some of them need FILE*).  */
  99 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 100        (EXP == 0                                        \
 101         || (!prototype_p (TREE_TYPE (EXP))      \
 102             && !DECL_BUILT_IN (EXP)))
 103
 104 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 105    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 106    without prototypes.  */
 107 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 108
 109 /* For a CONSTRUCTOR, whether some initializer contains a
 110    subexpression meaning it is not a constant expression.  */
 111 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 112
 113 /* Record parser information about an expression that is irrelevant
 114    for code generation alongside a tree representing its value.  */
 115 struct c_expr
 116 {
 117   /* The value of the expression.  */
 118   tree value;
 119   /* Record the original unary/binary operator of an expression, which may
 120      have been changed by fold, STRING_CST for unparenthesized string
 121      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 122      (even if parenthesized), for subexpressions, and for non-constant
 123      initializers, or ERROR_MARK for other expressions (including
 124      parenthesized expressions).  */
 125   enum tree_code original_code;
 126   /* If not NULL, the original type of an expression.  This will
 127      differ from the type of the value field for an enum constant.
 128      The type of an enum constant is a plain integer type, but this
 129      field will be the enum type.  */
 130   tree original_type;
 131 };
 132
 133 /* Type alias for struct c_expr. This allows to use the structure
 134    inside the VEC types.  */
 135 typedef struct c_expr c_expr_t;
 136
 137 /* A varray of c_expr_t.  */
 138 DEF_VEC_O (c_expr_t);
 139 DEF_VEC_ALLOC_O (c_expr_t, gc);
 140 DEF_VEC_ALLOC_O (c_expr_t, heap);
 141
 142 /* Append a new c_expr_t element to V.  */
 143 #define C_EXPR_APPEND(V, ELEM) \
 144   do { \
 145     c_expr_t *__elem_p = VEC_safe_push (c_expr_t, gc, V, NULL); \
 146     *__elem_p = (ELEM); \
 147   } while (0)
 148
 149 /* A kind of type specifier.  Note that this information is currently
 150    only used to distinguish tag definitions, tag references and typeof
 151    uses.  */
 152 enum c_typespec_kind {
 153   /* No typespec.  This appears only in struct c_declspec.  */
 154   ctsk_none,
 155   /* A reserved keyword type specifier.  */
 156   ctsk_resword,
 157   /* A reference to a tag, previously declared, such as "struct foo".
 158      This includes where the previous declaration was as a different
 159      kind of tag, in which case this is only valid if shadowing that
 160      tag in an inner scope.  */
 161   ctsk_tagref,
 162   /* A reference to a tag, not previously declared in a visible
 163      scope.  */
 164   ctsk_tagfirstref,
 165   /* A definition of a tag such as "struct foo { int a; }".  */
 166   ctsk_tagdef,
 167   /* A typedef name.  */
 168   ctsk_typedef,
 169   /* An ObjC-specific kind of type specifier.  */
 170   ctsk_objc,
 171   /* A typeof specifier.  */
 172   ctsk_typeof
 173 };
 174
 175 /* A type specifier: this structure is created in the parser and
 176    passed to declspecs_add_type only.  */
 177 struct c_typespec {
 178   /* What kind of type specifier this is.  */
 179   enum c_typespec_kind kind;
 180   /* Whether the expression has operands suitable for use in constant
 181      expressions.  */
 182   bool expr_const_operands;
 183   /* The specifier itself.  */
 184   tree spec;
 185   /* An expression to be evaluated before the type specifier, in the
 186      case of typeof specifiers, or NULL otherwise or if no such
 187      expression is required for a particular typeof specifier.  In
 188      particular, when typeof is applied to an expression of variably
 189      modified type, that expression must be evaluated in order to
 190      determine array sizes that form part of the type, but the
 191      expression itself (as opposed to the array sizes) forms no part
 192      of the type and so needs to be recorded separately.  */
 193   tree expr;
 194 };
 195
 196 /* A storage class specifier.  */
 197 enum c_storage_class {
 198   csc_none,
 199   csc_auto,
 200   csc_extern,
 201   csc_register,
 202   csc_static,
 203   csc_typedef
 204 };
 205
 206 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 207    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 208    or none of these.  */
 209 enum c_typespec_keyword {
 210   cts_none,
 211   cts_void,
 212   cts_bool,
 213   cts_char,
 214   cts_int,
 215   cts_float,
 216   cts_int128,
 217   cts_double,
 218   cts_dfloat32,
 219   cts_dfloat64,
 220   cts_dfloat128,
 221   cts_fract,
 222   cts_accum
 223 };
 224
 225 /* This enum lists all the possible declarator specifiers, storage
 226    class or attribute that a user can write.  There is at least one
 227    enumerator per possible declarator specifier in the struct
 228    c_declspecs below.
 229
 230    It is used to index the array of declspec locations in struct
 231    c_declspecs.  */
 232 enum c_declspec_word {
 233   cdw_typespec /* A catch-all for a typespec.  */,
 234   cdw_storage_class  /* A catch-all for a storage class */,
 235   cdw_attributes,
 236   cdw_typedef,
 237   cdw_explicit_signed,
 238   cdw_deprecated,
 239   cdw_default_int,
 240   cdw_long,
 241   cdw_long_long,
 242   cdw_short,
 243   cdw_signed,
 244   cdw_unsigned,
 245   cdw_complex,
 246   cdw_inline,
 247   cdw_noreturn,
 248   cdw_thread,
 249   cdw_const,
 250   cdw_volatile,
 251   cdw_restrict,
 252   cdw_saturating,
 253   cdw_alignas,
 254   cdw_address_space,
 255   cdw_number_of_elements /* This one must always be the last
 256                             enumerator.  */
 257 };
 258
 259 /* A sequence of declaration specifiers in C.  When a new declaration
 260    specifier is added, please update the enum c_declspec_word above
 261    accordingly.  */
 262 struct c_declspecs {
 263   source_location locations[cdw_number_of_elements];
 264   /* The type specified, if a single type specifier such as a struct,
 265      union or enum specifier, typedef name or typeof specifies the
 266      whole type, or NULL_TREE if none or a keyword such as "void" or
 267      "char" is used.  Does not include qualifiers.  */
 268   tree type;
 269   /* Any expression to be evaluated before the type, from a typeof
 270      specifier.  */
 271   tree expr;
 272   /* The attributes from a typedef decl.  */
 273   tree decl_attr;
 274   /* When parsing, the attributes.  Outside the parser, this will be
 275      NULL; attributes (possibly from multiple lists) will be passed
 276      separately.  */
 277   tree attrs;
 278   /* For UPC, this is the blocking factor (layout qualifier).
 279      For example, shared [10] int x;  */
 280   tree upc_layout_qualifier;
 281   /* The base-2 log of the greatest alignment required by an _Alignas
 282      specifier, in bytes, or -1 if no such specifiers with nonzero
 283      alignment.  */
 284   int align_log;
 285   /* The storage class specifier, or csc_none if none.  */
 286   enum c_storage_class storage_class;
 287   /* Any type specifier keyword used such as "int", not reflecting
 288      modifiers such as "short", or cts_none if none.  */
 289   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 290   /* The kind of type specifier if one has been seen, ctsk_none
 291      otherwise.  */
 292   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 293   /* Whether any expressions in typeof specifiers may appear in
 294      constant expressions.  */
 295   BOOL_BITFIELD expr_const_operands : 1;
 296   /* Whether any declaration specifiers have been seen at all.  */
 297   BOOL_BITFIELD declspecs_seen_p : 1;
 298   /* Whether something other than a storage class specifier or
 299      attribute has been seen.  This is used to warn for the
 300      obsolescent usage of storage class specifiers other than at the
 301      start of the list.  (Doing this properly would require function
 302      specifiers to be handled separately from storage class
 303      specifiers.)  */
 304   BOOL_BITFIELD non_sc_seen_p : 1;
 305   /* Whether the type is specified by a typedef or typeof name.  */
 306   BOOL_BITFIELD typedef_p : 1;
 307   /* Whether the type is explicitly "signed" or specified by a typedef
 308      whose type is explicitly "signed".  */
 309   BOOL_BITFIELD explicit_signed_p : 1;
 310   /* Whether the specifiers include a deprecated typedef.  */
 311   BOOL_BITFIELD deprecated_p : 1;
 312   /* Whether the type defaulted to "int" because there were no type
 313      specifiers.  */
 314   BOOL_BITFIELD default_int_p : 1;
 315   /* Whether "long" was specified.  */
 316   BOOL_BITFIELD long_p : 1;
 317   /* Whether "long" was specified more than once.  */
 318   BOOL_BITFIELD long_long_p : 1;
 319   /* Whether "short" was specified.  */
 320   BOOL_BITFIELD short_p : 1;
 321   /* Whether "signed" was specified.  */
 322   BOOL_BITFIELD signed_p : 1;
 323   /* Whether "unsigned" was specified.  */
 324   BOOL_BITFIELD unsigned_p : 1;
 325   /* Whether "complex" was specified.  */
 326   BOOL_BITFIELD complex_p : 1;
 327   /* Whether "inline" was specified.  */
 328   BOOL_BITFIELD inline_p : 1;
 329   /* Whether "_Noreturn" was speciied.  */
 330   BOOL_BITFIELD noreturn_p : 1;
 331   /* Whether "__thread" was specified.  */
 332   BOOL_BITFIELD thread_p : 1;
 333   /* Whether "const" was specified.  */
 334   BOOL_BITFIELD const_p : 1;
 335   /* Whether "volatile" was specified.  */
 336   BOOL_BITFIELD volatile_p : 1;
 337   /* Whether "restrict" was specified.  */
 338   BOOL_BITFIELD restrict_p : 1;
 339   /* Whether "_Sat" was specified.  */
 340   BOOL_BITFIELD saturating_p : 1;
 341   /* Whether "shared" was specified.  */
 342   BOOL_BITFIELD shared_p : 1;
 343   /* Whether "strict" was specified.  */
 344   BOOL_BITFIELD strict_p : 1;
 345   /* Whether "relaxed" was specified.  */
 346   BOOL_BITFIELD relaxed_p : 1;
 347   /* Whether any alignment specifier (even with zero alignment) was
 348      specified.  */
 349   BOOL_BITFIELD alignas_p : 1;
 350   /* The address space that the declaration belongs to.  */
 351   addr_space_t address_space;
 352 };
 353
 354 /* The various kinds of declarators in C.  */
 355 enum c_declarator_kind {
 356   /* An identifier.  */
 357   cdk_id,
 358   /* A function.  */
 359   cdk_function,
 360   /* An array.  */
 361   cdk_array,
 362   /* A pointer.  */
 363   cdk_pointer,
 364   /* Parenthesized declarator with nested attributes.  */
 365   cdk_attrs
 366 };
 367
 368 typedef struct c_arg_tag_d {
 369   /* The argument name.  */
 370   tree id;
 371   /* The type of the argument.  */
 372   tree type;
 373 } c_arg_tag;
 374
 375 DEF_VEC_O(c_arg_tag);
 376 DEF_VEC_ALLOC_O(c_arg_tag,gc);
 377
 378 /* Information about the parameters in a function declarator.  */
 379 struct c_arg_info {
 380   /* A list of parameter decls.  */
 381   tree parms;
 382   /* A list of structure, union and enum tags defined.  */
 383   VEC(c_arg_tag,gc) *tags;
 384   /* A list of argument types to go in the FUNCTION_TYPE.  */
 385   tree types;
 386   /* A list of non-parameter decls (notably enumeration constants)
 387      defined with the parameters.  */
 388   tree others;
 389   /* A compound expression of VLA sizes from the parameters, or NULL.
 390      In a function definition, these are used to ensure that
 391      side-effects in sizes of arrays converted to pointers (such as a
 392      parameter int i[n++]) take place; otherwise, they are
 393      ignored.  */
 394   tree pending_sizes;
 395   /* True when these arguments had [*].  */
 396   BOOL_BITFIELD had_vla_unspec : 1;
 397 };
 398
 399 /* A declarator.  */
 400 struct c_declarator {
 401   /* The kind of declarator.  */
 402   enum c_declarator_kind kind;
 403   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 404   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 405   struct c_declarator *declarator;
 406   union {
 407     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 408        declarator.  */
 409     tree id;
 410     /* For functions.  */
 411     struct c_arg_info *arg_info;
 412     /* For arrays.  */
 413     struct {
 414       /* The array dimension, or NULL for [] and [*].  */
 415       tree dimen;
 416       /* The qualifiers inside [].  */
 417       int quals;
 418       /* The attributes (currently ignored) inside [].  */
 419       tree attrs;
 420       /* Whether [static] was used.  */
 421       BOOL_BITFIELD static_p : 1;
 422       /* Whether [*] was used.  */
 423       BOOL_BITFIELD vla_unspec_p : 1;
 424     } array;
 425     /* For pointers, the qualifiers on the pointer type.  */
 426     struct {
 427       int quals;
 428       tree upc_layout_qual;
 429     } pointer;
 430     /* For attributes.  */
 431     tree attrs;
 432   } u;
 433 };
 434
 435 /* A type name.  */
 436 struct c_type_name {
 437   /* The declaration specifiers.  */
 438   struct c_declspecs *specs;
 439   /* The declarator.  */
 440   struct c_declarator *declarator;
 441 };
 442
 443 /* A parameter.  */
 444 struct c_parm {
 445   /* The declaration specifiers, minus any prefix attributes.  */
 446   struct c_declspecs *specs;
 447   /* The attributes.  */
 448   tree attrs;
 449   /* The declarator.  */
 450   struct c_declarator *declarator;
 451 };
 452
 453 /* Used when parsing an enum.  Initialized by start_enum.  */
 454 struct c_enum_contents
 455 {
 456   /* While defining an enum type, this is 1 plus the last enumerator
 457      constant value.  */
 458   tree enum_next_value;
 459
 460   /* Nonzero means that there was overflow computing enum_next_value.  */
 461   int enum_overflow;
 462 };
 463
 464 /* A type of reference to a static identifier in an inline
 465    function.  */
 466 enum c_inline_static_type {
 467   /* Identifier with internal linkage used in function that may be an
 468      inline definition (i.e., file-scope static).  */
 469   csi_internal,
 470   /* Modifiable object with static storage duration defined in
 471      function that may be an inline definition (i.e., local
 472      static).  */
 473   csi_modifiable
 474 };
 475
 476 \f
 477 /* in c-parser.c */
 478 extern void c_parse_init (void);
 479
 480 /* in c-aux-info.c */
 481 extern void gen_aux_info_record (tree, int, int, int);
 482
 483 /* in c-decl.c */
 484 struct c_spot_bindings;
 485 struct c_struct_parse_info;
 486 extern struct obstack parser_obstack;
 487 extern tree c_break_label;
 488 extern tree c_cont_label;
 489
 490 extern bool global_bindings_p (void);
 491 extern void push_scope (void);
 492 extern tree pop_scope (void);
 493 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 494 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 495
 496 extern void record_inline_static (location_t, tree, tree,
 497                                   enum c_inline_static_type);
 498 extern void c_init_decl_processing (void);
 499 extern void c_print_identifier (FILE *, tree, int);
 500 extern int quals_from_declspecs (const struct c_declspecs *);
 501 extern struct c_declarator *build_array_declarator (location_t, tree,
 502                                                     struct c_declspecs *,
 503                                                     bool, bool);
 504 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 505                               tree, tree);
 506 extern tree check_for_loop_decls (location_t, bool);
 507 extern void mark_forward_parm_decls (void);
 508 extern void declare_parm_level (void);
 509 extern void undeclared_variable (location_t, tree);
 510 extern tree lookup_label_for_goto (location_t, tree);
 511 extern tree declare_label (tree);
 512 extern tree define_label (location_t, tree);
 513 extern struct c_spot_bindings *c_get_switch_bindings (void);
 514 extern void c_release_switch_bindings (struct c_spot_bindings *);
 515 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 516                                           location_t, location_t);
 517 extern void finish_decl (tree, location_t, tree, tree, tree);
 518 extern tree finish_enum (tree, tree, tree);
 519 extern void finish_function (void);
 520 extern tree finish_struct (location_t, tree, tree, tree,
 521                            struct c_struct_parse_info *);
 522 extern struct c_arg_info *build_arg_info (void);
 523 extern struct c_arg_info *get_parm_info (bool, tree);
 524 extern tree grokfield (location_t, struct c_declarator *,
 525                        struct c_declspecs *, tree, tree *);
 526 extern tree groktypename (struct c_type_name *, tree *, bool *);
 527 extern tree grokparm (const struct c_parm *, tree *);
 528 extern tree implicitly_declare (location_t, tree);
 529 extern void keep_next_level (void);
 530 extern void pending_xref_error (void);
 531 extern void c_push_function_context (void);
 532 extern void c_pop_function_context (void);
 533 extern void push_parm_decl (const struct c_parm *, tree *);
 534 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 535                                                         struct c_declarator *);
 536 extern tree c_builtin_function (tree);
 537 extern tree c_builtin_function_ext_scope (tree);
 538 extern void shadow_tag (const struct c_declspecs *);
 539 extern void shadow_tag_warned (const struct c_declspecs *, int);
 540 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 541 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 542 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 543                         tree);
 544 extern tree start_struct (location_t, enum tree_code, tree,
 545                           struct c_struct_parse_info **);
 546 extern void store_parm_decls (void);
 547 extern void store_parm_decls_from (struct c_arg_info *);
 548 extern tree xref_tag (enum tree_code, tree);
 549 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 550 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 551                                     struct c_declarator *);
 552 extern struct c_declarator *build_attrs_declarator (tree,
 553                                                     struct c_declarator *);
 554 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 555                                                        struct c_declarator *);
 556 extern struct c_declarator *build_id_declarator (tree);
 557 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 558                                                      struct c_declarator *);
 559 extern struct c_declspecs *build_null_declspecs (void);
 560 extern struct c_declspecs *declspecs_add_qual (source_location,
 561                                                struct c_declspecs *, tree);
 562 extern struct c_declspecs *declspecs_add_type (location_t,
 563                                                struct c_declspecs *,
 564                                                struct c_typespec);
 565 extern struct c_declspecs *declspecs_add_scspec (source_location,
 566                                                  struct c_declspecs *, tree);
 567 extern struct c_declspecs *declspecs_add_attrs (source_location,
 568                                                 struct c_declspecs *, tree);
 569 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 570                                                     struct c_declspecs *,
 571                                                     addr_space_t);
 572 extern struct c_declspecs *declspecs_add_alignas (source_location,
 573                                                   struct c_declspecs *, tree);
 574 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 575
 576 /* in c-objc-common.c */
 577 extern bool c_objc_common_init (void);
 578 extern bool c_missing_noreturn_ok_p (tree);
 579 extern bool c_warn_unused_global_decl (const_tree);
 580 extern void c_initialize_diagnostics (diagnostic_context *);
 581 extern bool c_vla_unspec_p (tree x, tree fn);
 582
 583 /* in c-typeck.c */
 584 extern int in_alignof;
 585 extern int in_sizeof;
 586 extern int in_typeof;
 587
 588 extern struct c_switch *c_switch_stack;
 589
 590 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 591 extern tree require_complete_type (tree);
 592 extern int same_translation_unit_p (const_tree, const_tree);
 593 extern int comptypes (tree, tree);
 594 extern int comptypes_check_different_types (tree, tree, bool *);
 595 extern bool c_vla_type_p (const_tree);
 596 extern bool c_mark_addressable (tree);
 597 extern void c_incomplete_type_error (const_tree, const_tree);
 598 extern tree c_type_promotes_to (tree);
 599 extern struct c_expr default_function_array_conversion (location_t,
 600                                                         struct c_expr);
 601 extern struct c_expr default_function_array_read_conversion (location_t,
 602                                                              struct c_expr);
 603 extern void mark_exp_read (tree);
 604 extern tree composite_type (tree, tree);
 605 extern tree build_component_ref (location_t, tree, tree);
 606 extern tree build_array_ref (location_t, tree, tree);
 607 extern tree build_external_ref (location_t, tree, int, tree *);
 608 extern void pop_maybe_used (bool);
 609 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 610 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 611 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 612                                             struct c_expr);
 613 extern struct c_expr parser_build_binary_op (location_t,
 614                                              enum tree_code, struct c_expr,
 615                                              struct c_expr);
 616 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 617                                     tree, tree);
 618 extern tree build_compound_expr (location_t, tree, tree);
 619 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 620 extern tree build_c_cast (location_t, tree, tree);
 621 extern void store_init_value (location_t, tree, tree, tree);
 622 extern void error_init (const char *);
 623 extern void pedwarn_init (location_t, int opt, const char *);
 624 extern void maybe_warn_string_init (tree, struct c_expr);
 625 extern void start_init (tree, tree, int);
 626 extern void finish_init (void);
 627 extern void really_start_incremental_init (tree);
 628 extern void push_init_level (int, struct obstack *);
 629 extern struct c_expr pop_init_level (int, struct obstack *);
 630 extern void set_init_index (tree, tree, struct obstack *);
 631 extern void set_init_label (tree, struct obstack *);
 632 extern void process_init_element (struct c_expr, bool, struct obstack *);
 633 extern tree build_compound_literal (location_t, tree, tree, bool);
 634 extern void check_compound_literal_type (location_t, struct c_type_name *);
 635 extern tree c_start_case (location_t, location_t, tree);
 636 extern void c_finish_case (tree);
 637 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 638 extern tree build_asm_stmt (tree, tree);
 639 extern int c_types_compatible_p (tree, tree);
 640 extern tree c_begin_compound_stmt (bool);
 641 extern tree c_end_compound_stmt (location_t, tree, bool);
 642 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 643 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 644 extern tree c_begin_stmt_expr (void);
 645 extern tree c_finish_stmt_expr (location_t, tree);
 646 extern tree c_process_expr_stmt (location_t, tree);
 647 extern tree c_finish_expr_stmt (location_t, tree);
 648 extern tree c_finish_return (location_t, tree, tree);
 649 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 650 extern tree c_finish_goto_label (location_t, tree);
 651 extern tree c_finish_goto_ptr (location_t, tree);
 652 extern tree c_expr_to_decl (tree, bool *, bool *);
 653 extern tree c_begin_omp_parallel (void);
 654 extern tree c_finish_omp_parallel (location_t, tree, tree);
 655 extern tree c_begin_omp_task (void);
 656 extern tree c_finish_omp_task (location_t, tree, tree);
 657 extern tree c_finish_omp_clauses (tree);
 658 extern tree c_build_va_arg (location_t, tree, tree);
 659 extern tree c_finish_transaction (location_t, tree, int);
 660
 661 /* Set to 0 at beginning of a function definition, set to 1 if
 662    a return statement that specifies a return value is seen.  */
 663
 664 extern int current_function_returns_value;
 665
 666 /* Set to 0 at beginning of a function definition, set to 1 if
 667    a return statement with no argument is seen.  */
 668
 669 extern int current_function_returns_null;
 670
 671 /* Set to 0 at beginning of a function definition, set to 1 if
 672    a call to a noreturn function is seen.  */
 673
 674 extern int current_function_returns_abnormally;
 675
 676 /* Mode used to build pointers (VOIDmode means ptr_mode).  */
 677
 678 extern enum machine_mode c_default_pointer_mode;
 679
 680 /* In c-decl.c */
 681 extern void c_finish_incomplete_decl (tree);
 682 extern void c_write_global_declarations (void);
 683
 684 /* In c-errors.c */
 685 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 686 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_DIAG(3,4);
 687
 688 #endif /* ! GCC_C_TREE_H */