gcc/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987, 1993, 1994, 1995, 1997, 1998,
   3    1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009
   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-common.h"
  26 #include "toplev.h"
  27 #include "diagnostic.h"
  28
  29 /* struct lang_identifier is private to c-decl.c, but langhooks.c needs to
  30    know how big it is.  This is sanity-checked in c-decl.c.  */
  31 #define C_SIZEOF_STRUCT_LANG_IDENTIFIER \
  32   (sizeof (struct c_common_identifier) + 3 * sizeof (void *))
  33
  34 /* Language-specific declaration information.  */
  35
  36 struct lang_decl GTY(())
  37 {
  38   char dummy;
  39 };
  40
  41 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only.  */
  42 #define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1 (TYPE)
  43
  44 /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile.  */
  45 #define C_TYPE_FIELDS_VOLATILE(TYPE) TREE_LANG_FLAG_2 (TYPE)
  46
  47 /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE
  48    nonzero if the definition of the type has already started.  */
  49 #define C_TYPE_BEING_DEFINED(TYPE) TYPE_LANG_FLAG_0 (TYPE)
  50
  51 /* In an incomplete RECORD_TYPE or UNION_TYPE, a list of variable
  52    declarations whose type would be completed by completing that type.  */
  53 #define C_TYPE_INCOMPLETE_VARS(TYPE) TYPE_VFIELD (TYPE)
  54
  55 /* In an IDENTIFIER_NODE, nonzero if this identifier is actually a
  56    keyword.  C_RID_CODE (node) is then the RID_* value of the keyword,
  57    and C_RID_YYCODE is the token number wanted by Yacc.  */
  58 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  59
  60 struct lang_type GTY(())
  61 {
  62   /* In a RECORD_TYPE, a sorted array of the fields of the type.  */
  63   struct sorted_fields_type * GTY ((reorder ("resort_sorted_fields"))) s;
  64   /* In an ENUMERAL_TYPE, the min and max values.  */
  65   tree enum_min;
  66   tree enum_max;
  67   /* In a RECORD_TYPE, information specific to Objective-C, such
  68      as a list of adopted protocols or a pointer to a corresponding
  69      @interface.  See objc/objc-act.h for details.  */
  70   tree objc_info;
  71 };
  72
  73 /* Record whether a type or decl was written with nonconstant size.
  74    Note that TYPE_SIZE may have simplified to a constant.  */
  75 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  76 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  77
  78 /* Record whether a typedef for type `int' was actually `signed int'.  */
  79 #define C_TYPEDEF_EXPLICITLY_SIGNED(EXP) DECL_LANG_FLAG_1 (EXP)
  80
  81 /* For a FUNCTION_DECL, nonzero if it was defined without an explicit
  82    return type.  */
  83 #define C_FUNCTION_IMPLICIT_INT(EXP) DECL_LANG_FLAG_1 (EXP)
  84
  85 /* For a FUNCTION_DECL, nonzero if it was an implicit declaration.  */
  86 #define C_DECL_IMPLICIT(EXP) DECL_LANG_FLAG_2 (EXP)
  87
  88 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  89    been declared.  */
  90 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  91   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  92
  93 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  94    built-in prototype and does not have a non-built-in prototype.  */
  95 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  96   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  97
  98 /* Record whether a decl was declared register.  This is strictly a
  99    front-end flag, whereas DECL_REGISTER is used for code generation;
 100    they may differ for structures with volatile fields.  */
 101 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
 102
 103 /* Record whether a decl was used in an expression anywhere except an
 104    unevaluated operand of sizeof / typeof / alignof.  This is only
 105    used for functions declared static but not defined, though outside
 106    sizeof and typeof it is set for other function decls as well.  */
 107 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
 108
 109 /* Record whether a label was defined in a statement expression which
 110    has finished and so can no longer be jumped to.  */
 111 #define C_DECL_UNJUMPABLE_STMT_EXPR(EXP)        \
 112   DECL_LANG_FLAG_6 (LABEL_DECL_CHECK (EXP))
 113
 114 /* Record whether a label was the subject of a goto from outside the
 115    current level of statement expression nesting and so cannot be
 116    defined right now.  */
 117 #define C_DECL_UNDEFINABLE_STMT_EXPR(EXP)       \
 118   DECL_LANG_FLAG_7 (LABEL_DECL_CHECK (EXP))
 119
 120 /* Record whether a label was defined in the scope of an identifier
 121    with variably modified type which has finished and so can no longer
 122    be jumped to.  */
 123 #define C_DECL_UNJUMPABLE_VM(EXP)       \
 124   DECL_LANG_FLAG_3 (LABEL_DECL_CHECK (EXP))
 125
 126 /* Record whether a label was the subject of a goto from outside the
 127    current level of scopes of identifiers with variably modified type
 128    and so cannot be defined right now.  */
 129 #define C_DECL_UNDEFINABLE_VM(EXP)      \
 130   DECL_LANG_FLAG_5 (LABEL_DECL_CHECK (EXP))
 131
 132 /* Record whether a variable has been declared threadprivate by
 133    #pragma omp threadprivate.  */
 134 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
 135
 136 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 137    N.B. Could be simplified if all built-in decls had complete prototypes
 138    (but this is presently difficult because some of them need FILE*).  */
 139 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 140        (EXP == 0                                        \
 141         || (TYPE_ARG_TYPES (TREE_TYPE (EXP)) == 0       \
 142             && !DECL_BUILT_IN (EXP)))
 143
 144 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 145    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 146    without prototypes.  */
 147 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 148
 149 /* For a CONSTRUCTOR, whether some initializer contains a
 150    subexpression meaning it is not a constant expression.  */
 151 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 152
 153 /* Record parser information about an expression that is irrelevant
 154    for code generation alongside a tree representing its value.  */
 155 struct c_expr
 156 {
 157   /* The value of the expression.  */
 158   tree value;
 159   /* Record the original unary/binary operator of an expression, which may
 160      have been changed by fold, STRING_CST for unparenthesized string
 161      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 162      (even if parenthesized), for subexpressions, and for non-constant
 163      initializers, or ERROR_MARK for other expressions (including
 164      parenthesized expressions).  */
 165   enum tree_code original_code;
 166 };
 167
 168 /* A kind of type specifier.  Note that this information is currently
 169    only used to distinguish tag definitions, tag references and typeof
 170    uses.  */
 171 enum c_typespec_kind {
 172   /* A reserved keyword type specifier.  */
 173   ctsk_resword,
 174   /* A reference to a tag, previously declared, such as "struct foo".
 175      This includes where the previous declaration was as a different
 176      kind of tag, in which case this is only valid if shadowing that
 177      tag in an inner scope.  */
 178   ctsk_tagref,
 179   /* A reference to a tag, not previously declared in a visible
 180      scope.  */
 181   ctsk_tagfirstref,
 182   /* A definition of a tag such as "struct foo { int a; }".  */
 183   ctsk_tagdef,
 184   /* A typedef name.  */
 185   ctsk_typedef,
 186   /* An ObjC-specific kind of type specifier.  */
 187   ctsk_objc,
 188   /* A typeof specifier.  */
 189   ctsk_typeof
 190 };
 191
 192 /* A type specifier: this structure is created in the parser and
 193    passed to declspecs_add_type only.  */
 194 struct c_typespec {
 195   /* What kind of type specifier this is.  */
 196   enum c_typespec_kind kind;
 197   /* The specifier itself.  */
 198   tree spec;
 199   /* An expression to be evaluated before the type specifier, in the
 200      case of typeof specifiers, or NULL otherwise or if no such
 201      expression is required for a particular typeof specifier.  In
 202      particular, when typeof is applied to an expression of variably
 203      modified type, that expression must be evaluated in order to
 204      determine array sizes that form part of the type, but the
 205      expression itself (as opposed to the array sizes) forms no part
 206      of the type and so needs to be recorded separately.  */
 207   tree expr;
 208   /* Whether the expression has operands suitable for use in constant
 209      expressions.  */
 210   bool expr_const_operands;
 211 };
 212
 213 /* A storage class specifier.  */
 214 enum c_storage_class {
 215   csc_none,
 216   csc_auto,
 217   csc_extern,
 218   csc_register,
 219   csc_static,
 220   csc_typedef
 221 };
 222
 223 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 224    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 225    or none of these.  */
 226 enum c_typespec_keyword {
 227   cts_none,
 228   cts_void,
 229   cts_bool,
 230   cts_char,
 231   cts_int,
 232   cts_float,
 233   cts_double,
 234   cts_dfloat32,
 235   cts_dfloat64,
 236   cts_dfloat128,
 237   cts_fract,
 238   cts_accum
 239 };
 240
 241 /* A sequence of declaration specifiers in C.  */
 242 struct c_declspecs {
 243   /* The type specified, if a single type specifier such as a struct,
 244      union or enum specifier, typedef name or typeof specifies the
 245      whole type, or NULL_TREE if none or a keyword such as "void" or
 246      "char" is used.  Does not include qualifiers.  */
 247   tree type;
 248   /* Any expression to be evaluated before the type, from a typeof
 249      specifier.  */
 250   tree expr;
 251   /* The attributes from a typedef decl.  */
 252   tree decl_attr;
 253   /* When parsing, the attributes.  Outside the parser, this will be
 254      NULL; attributes (possibly from multiple lists) will be passed
 255      separately.  */
 256   tree attrs;
 257   /* Any type specifier keyword used such as "int", not reflecting
 258      modifiers such as "short", or cts_none if none.  */
 259   enum c_typespec_keyword typespec_word;
 260   /* The storage class specifier, or csc_none if none.  */
 261   enum c_storage_class storage_class;
 262   /* Whether any expressions in typeof specifiers may appear in
 263      constant expressions.  */
 264   BOOL_BITFIELD expr_const_operands : 1;
 265   /* Whether any declaration specifiers have been seen at all.  */
 266   BOOL_BITFIELD declspecs_seen_p : 1;
 267   /* Whether a type specifier has been seen.  */
 268   BOOL_BITFIELD type_seen_p : 1;
 269   /* Whether something other than a storage class specifier or
 270      attribute has been seen.  This is used to warn for the
 271      obsolescent usage of storage class specifiers other than at the
 272      start of the list.  (Doing this properly would require function
 273      specifiers to be handled separately from storage class
 274      specifiers.)  */
 275   BOOL_BITFIELD non_sc_seen_p : 1;
 276   /* Whether the type is specified by a typedef or typeof name.  */
 277   BOOL_BITFIELD typedef_p : 1;
 278   /* Whether a struct, union or enum type either had its content
 279      defined by a type specifier in the list or was the first visible
 280      declaration of its tag.  */
 281   BOOL_BITFIELD tag_defined_p : 1;
 282   /* Whether the type is explicitly "signed" or specified by a typedef
 283      whose type is explicitly "signed".  */
 284   BOOL_BITFIELD explicit_signed_p : 1;
 285   /* Whether the specifiers include a deprecated typedef.  */
 286   BOOL_BITFIELD deprecated_p : 1;
 287   /* Whether the type defaulted to "int" because there were no type
 288      specifiers.  */
 289   BOOL_BITFIELD default_int_p;
 290   /* Whether "long" was specified.  */
 291   BOOL_BITFIELD long_p : 1;
 292   /* Whether "long" was specified more than once.  */
 293   BOOL_BITFIELD long_long_p : 1;
 294   /* Whether "short" was specified.  */
 295   BOOL_BITFIELD short_p : 1;
 296   /* Whether "signed" was specified.  */
 297   BOOL_BITFIELD signed_p : 1;
 298   /* Whether "unsigned" was specified.  */
 299   BOOL_BITFIELD unsigned_p : 1;
 300   /* Whether "complex" was specified.  */
 301   BOOL_BITFIELD complex_p : 1;
 302   /* Whether "inline" was specified.  */
 303   BOOL_BITFIELD inline_p : 1;
 304   /* Whether "__thread" was specified.  */
 305   BOOL_BITFIELD thread_p : 1;
 306   /* Whether "const" was specified.  */
 307   BOOL_BITFIELD const_p : 1;
 308   /* Whether "volatile" was specified.  */
 309   BOOL_BITFIELD volatile_p : 1;
 310   /* Whether "restrict" was specified.  */
 311   BOOL_BITFIELD restrict_p : 1;
 312   /* Whether "_Sat" was specified.  */
 313   BOOL_BITFIELD saturating_p : 1;
 314 };
 315
 316 /* The various kinds of declarators in C.  */
 317 enum c_declarator_kind {
 318   /* An identifier.  */
 319   cdk_id,
 320   /* A function.  */
 321   cdk_function,
 322   /* An array.  */
 323   cdk_array,
 324   /* A pointer.  */
 325   cdk_pointer,
 326   /* Parenthesized declarator with nested attributes.  */
 327   cdk_attrs
 328 };
 329
 330 /* Information about the parameters in a function declarator.  */
 331 struct c_arg_info {
 332   /* A list of parameter decls.  */
 333   tree parms;
 334   /* A list of structure, union and enum tags defined.  */
 335   tree tags;
 336   /* A list of argument types to go in the FUNCTION_TYPE.  */
 337   tree types;
 338   /* A list of non-parameter decls (notably enumeration constants)
 339      defined with the parameters.  */
 340   tree others;
 341   /* A list of VLA sizes from the parameters.  In a function
 342      definition, these are used to ensure that side-effects in sizes
 343      of arrays converted to pointers (such as a parameter int i[n++])
 344      take place; otherwise, they are ignored.  */
 345   tree pending_sizes;
 346   /* True when these arguments had [*].  */
 347   BOOL_BITFIELD had_vla_unspec : 1;
 348 };
 349
 350 /* A declarator.  */
 351 struct c_declarator {
 352   /* The kind of declarator.  */
 353   enum c_declarator_kind kind;
 354   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 355   struct c_declarator *declarator;
 356   location_t id_loc; /* Currently only set for cdk_id. */
 357   union {
 358     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 359        declarator.  */
 360     tree id;
 361     /* For functions.  */
 362     struct c_arg_info *arg_info;
 363     /* For arrays.  */
 364     struct {
 365       /* The array dimension, or NULL for [] and [*].  */
 366       tree dimen;
 367       /* The qualifiers inside [].  */
 368       int quals;
 369       /* The attributes (currently ignored) inside [].  */
 370       tree attrs;
 371       /* Whether [static] was used.  */
 372       BOOL_BITFIELD static_p : 1;
 373       /* Whether [*] was used.  */
 374       BOOL_BITFIELD vla_unspec_p : 1;
 375     } array;
 376     /* For pointers, the qualifiers on the pointer type.  */
 377     int pointer_quals;
 378     /* For attributes.  */
 379     tree attrs;
 380   } u;
 381 };
 382
 383 /* A type name.  */
 384 struct c_type_name {
 385   /* The declaration specifiers.  */
 386   struct c_declspecs *specs;
 387   /* The declarator.  */
 388   struct c_declarator *declarator;
 389 };
 390
 391 /* A parameter.  */
 392 struct c_parm {
 393   /* The declaration specifiers, minus any prefix attributes.  */
 394   struct c_declspecs *specs;
 395   /* The attributes.  */
 396   tree attrs;
 397   /* The declarator.  */
 398   struct c_declarator *declarator;
 399 };
 400
 401 /* Save and restore the variables in this file and elsewhere
 402    that keep track of the progress of compilation of the current function.
 403    Used for nested functions.  */
 404
 405 struct language_function GTY(())
 406 {
 407   struct c_language_function base;
 408   tree x_break_label;
 409   tree x_cont_label;
 410   struct c_switch * GTY((skip)) x_switch_stack;
 411   struct c_arg_info * GTY((skip)) arg_info;
 412   int returns_value;
 413   int returns_null;
 414   int returns_abnormally;
 415   int warn_about_return_type;
 416 };
 417
 418 /* Save lists of labels used or defined in particular contexts.
 419    Allocated on the parser obstack.  */
 420
 421 struct c_label_list
 422 {
 423   /* The label at the head of the list.  */
 424   tree label;
 425   /* The rest of the list.  */
 426   struct c_label_list *next;
 427 };
 428
 429 /* Statement expression context.  */
 430
 431 struct c_label_context_se
 432 {
 433   /* The labels defined at this level of nesting.  */
 434   struct c_label_list *labels_def;
 435   /* The labels used at this level of nesting.  */
 436   struct c_label_list *labels_used;
 437   /* The next outermost context.  */
 438   struct c_label_context_se *next;
 439 };
 440
 441 /* Context of variably modified declarations.  */
 442
 443 struct c_label_context_vm
 444 {
 445   /* The labels defined at this level of nesting.  */
 446   struct c_label_list *labels_def;
 447   /* The labels used at this level of nesting.  */
 448   struct c_label_list *labels_used;
 449   /* The scope of this context.  Multiple contexts may be at the same
 450      numbered scope, since each variably modified declaration starts a
 451      new context.  */
 452   unsigned scope;
 453   /* The next outermost context.  */
 454   struct c_label_context_vm *next;
 455 };
 456
 457 /* Used when parsing an enum.  Initialized by start_enum.  */
 458 struct c_enum_contents
 459 {
 460   /* While defining an enum type, this is 1 plus the last enumerator
 461      constant value.  */
 462   tree enum_next_value;
 463
 464   /* Nonzero means that there was overflow computing enum_next_value.  */
 465   int enum_overflow;
 466 };
 467
 468 \f
 469 /* in c-parser.c */
 470 extern void c_parse_init (void);
 471
 472 /* in c-aux-info.c */
 473 extern void gen_aux_info_record (tree, int, int, int);
 474
 475 /* in c-decl.c */
 476 extern struct obstack parser_obstack;
 477 extern tree c_break_label;
 478 extern tree c_cont_label;
 479
 480 extern int global_bindings_p (void);
 481 extern void push_scope (void);
 482 extern tree pop_scope (void);
 483
 484 extern void c_init_decl_processing (void);
 485 extern void c_dup_lang_specific_decl (tree);
 486 extern void c_print_identifier (FILE *, tree, int);
 487 extern int quals_from_declspecs (const struct c_declspecs *);
 488 extern struct c_declarator *build_array_declarator (tree, struct c_declspecs *,
 489                                                     bool, bool);
 490 extern tree build_enumerator (struct c_enum_contents *, tree, tree, location_t);
 491 extern tree check_for_loop_decls (void);
 492 extern void mark_forward_parm_decls (void);
 493 extern void declare_parm_level (void);
 494 extern void undeclared_variable (tree, location_t);
 495 extern tree declare_label (tree);
 496 extern tree define_label (location_t, tree);
 497 extern void c_maybe_initialize_eh (void);
 498 extern void finish_decl (tree, tree, tree);
 499 extern tree finish_enum (tree, tree, tree);
 500 extern void finish_function (void);
 501 extern tree finish_struct (tree, tree, tree);
 502 extern struct c_arg_info *get_parm_info (bool);
 503 extern tree grokfield (location_t, struct c_declarator *,
 504                        struct c_declspecs *, tree, tree *);
 505 extern tree groktypename (struct c_type_name *, tree *, bool *);
 506 extern tree grokparm (const struct c_parm *);
 507 extern tree implicitly_declare (tree);
 508 extern void keep_next_level (void);
 509 extern void pending_xref_error (void);
 510 extern void c_push_function_context (void);
 511 extern void c_pop_function_context (void);
 512 extern void push_parm_decl (const struct c_parm *);
 513 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 514                                                         struct c_declarator *);
 515 extern tree c_builtin_function (tree);
 516 extern tree c_builtin_function_ext_scope (tree);
 517 extern void shadow_tag (const struct c_declspecs *);
 518 extern void shadow_tag_warned (const struct c_declspecs *, int);
 519 extern tree start_enum (struct c_enum_contents *, tree);
 520 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 521 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 522                         tree);
 523 extern tree start_struct (enum tree_code, tree);
 524 extern void store_parm_decls (void);
 525 extern void store_parm_decls_from (struct c_arg_info *);
 526 extern tree xref_tag (enum tree_code, tree);
 527 extern struct c_typespec parser_xref_tag (enum tree_code, tree);
 528 extern int c_expand_decl (tree);
 529 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 530                                     struct c_declarator *);
 531 extern struct c_declarator *build_attrs_declarator (tree,
 532                                                     struct c_declarator *);
 533 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 534                                                        struct c_declarator *);
 535 extern struct c_declarator *build_id_declarator (tree);
 536 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 537                                                      struct c_declarator *);
 538 extern struct c_declspecs *build_null_declspecs (void);
 539 extern struct c_declspecs *declspecs_add_qual (struct c_declspecs *, tree);
 540 extern struct c_declspecs *declspecs_add_type (struct c_declspecs *,
 541                                                struct c_typespec);
 542 extern struct c_declspecs *declspecs_add_scspec (struct c_declspecs *, tree);
 543 extern struct c_declspecs *declspecs_add_attrs (struct c_declspecs *, tree);
 544 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 545
 546 /* in c-objc-common.c */
 547 extern bool c_objc_common_init (void);
 548 extern bool c_missing_noreturn_ok_p (tree);
 549 extern bool c_warn_unused_global_decl (const_tree);
 550 extern void c_initialize_diagnostics (diagnostic_context *);
 551 extern bool c_vla_unspec_p (tree x, tree fn);
 552
 553 #define c_build_type_variant(TYPE, CONST_P, VOLATILE_P)           \
 554   c_build_qualified_type ((TYPE),                                 \
 555                           ((CONST_P) ? TYPE_QUAL_CONST : 0) |     \
 556                           ((VOLATILE_P) ? TYPE_QUAL_VOLATILE : 0))
 557
 558 /* in c-typeck.c */
 559 extern bool in_late_binary_op;
 560 extern int in_alignof;
 561 extern int in_sizeof;
 562 extern int in_typeof;
 563
 564 extern struct c_switch *c_switch_stack;
 565 extern struct c_label_context_se *label_context_stack_se;
 566 extern struct c_label_context_vm *label_context_stack_vm;
 567
 568 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 569 extern tree require_complete_type (tree);
 570 extern int same_translation_unit_p (const_tree, const_tree);
 571 extern int comptypes (tree, tree);
 572 extern bool c_vla_type_p (const_tree);
 573 extern bool c_mark_addressable (tree);
 574 extern void c_incomplete_type_error (const_tree, const_tree);
 575 extern tree c_type_promotes_to (tree);
 576 extern struct c_expr default_function_array_conversion (struct c_expr);
 577 extern tree composite_type (tree, tree);
 578 extern tree build_component_ref (tree, tree);
 579 extern tree build_array_ref (tree, tree, location_t);
 580 extern tree build_external_ref (tree, int, location_t);
 581 extern void pop_maybe_used (bool);
 582 extern struct c_expr c_expr_sizeof_expr (struct c_expr);
 583 extern struct c_expr c_expr_sizeof_type (struct c_type_name *);
 584 extern struct c_expr parser_build_unary_op (enum tree_code, struct c_expr,
 585                                             location_t);
 586 extern struct c_expr parser_build_binary_op (location_t,
 587                                              enum tree_code, struct c_expr,
 588                                              struct c_expr);
 589 extern tree build_conditional_expr (tree, bool, tree, tree);
 590 extern tree build_compound_expr (tree, tree);
 591 extern tree c_cast_expr (struct c_type_name *, tree);
 592 extern tree build_c_cast (tree, tree);
 593 extern void store_init_value (tree, tree);
 594 extern void error_init (const char *);
 595 extern void pedwarn_init (location_t, int opt, const char *);
 596 extern void maybe_warn_string_init (tree, struct c_expr);
 597 extern void start_init (tree, tree, int);
 598 extern void finish_init (void);
 599 extern void really_start_incremental_init (tree);
 600 extern void push_init_level (int);
 601 extern struct c_expr pop_init_level (int);
 602 extern void set_init_index (tree, tree);
 603 extern void set_init_label (tree);
 604 extern void process_init_element (struct c_expr, bool);
 605 extern tree build_compound_literal (tree, tree, bool);
 606 extern tree c_start_case (tree);
 607 extern void c_finish_case (tree);
 608 extern tree build_asm_expr (tree, tree, tree, tree, bool);
 609 extern tree build_asm_stmt (tree, tree);
 610 extern int c_types_compatible_p (tree, tree);
 611 extern tree c_begin_compound_stmt (bool);
 612 extern tree c_end_compound_stmt (tree, bool);
 613 extern void c_finish_if_stmt (location_t, tree, tree, tree, bool);
 614 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 615 extern tree c_begin_stmt_expr (void);
 616 extern tree c_finish_stmt_expr (tree);
 617 extern tree c_process_expr_stmt (tree);
 618 extern tree c_finish_expr_stmt (tree);
 619 extern tree c_finish_return (tree);
 620 extern tree c_finish_bc_stmt (tree *, bool);
 621 extern tree c_finish_goto_label (tree);
 622 extern tree c_finish_goto_ptr (tree);
 623 extern void c_begin_vm_scope (unsigned int);
 624 extern void c_end_vm_scope (unsigned int);
 625 extern tree c_expr_to_decl (tree, bool *, bool *);
 626 extern tree c_begin_omp_parallel (void);
 627 extern tree c_finish_omp_parallel (tree, tree);
 628 extern tree c_begin_omp_task (void);
 629 extern tree c_finish_omp_task (tree, tree);
 630 extern tree c_finish_omp_clauses (tree);
 631
 632 /* Set to 0 at beginning of a function definition, set to 1 if
 633    a return statement that specifies a return value is seen.  */
 634
 635 extern int current_function_returns_value;
 636
 637 /* Set to 0 at beginning of a function definition, set to 1 if
 638    a return statement with no argument is seen.  */
 639
 640 extern int current_function_returns_null;
 641
 642 /* Set to 0 at beginning of a function definition, set to 1 if
 643    a call to a noreturn function is seen.  */
 644
 645 extern int current_function_returns_abnormally;
 646
 647 /* Nonzero means we are reading code that came from a system header file.  */
 648
 649 extern int system_header_p;
 650
 651 /* True means global_bindings_p should return false even if the scope stack
 652    says we are in file scope.  */
 653
 654 extern bool c_override_global_bindings_to_false;
 655
 656 /* True means we've initialized exception handling.  */
 657 extern bool c_eh_initialized_p;
 658
 659 /* In c-decl.c */
 660 extern void c_finish_incomplete_decl (tree);
 661 extern void c_write_global_declarations (void);
 662
 663 /* In order for the format checking to accept the C frontend
 664    diagnostic framework extensions, you must include this file before
 665    toplev.h, not after.  */
 666 #if GCC_VERSION >= 4001
 667 #define ATTRIBUTE_GCC_CDIAG(m, n) __attribute__ ((__format__ (GCC_DIAG_STYLE, m ,n))) ATTRIBUTE_NONNULL(m)
 668 #else
 669 #define ATTRIBUTE_GCC_CDIAG(m, n) ATTRIBUTE_NONNULL(m)
 670 #endif
 671
 672 extern void pedwarn_c90 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
 673 extern void pedwarn_c99 (location_t, int opt, const char *, ...) ATTRIBUTE_GCC_CDIAG(3,4);
 674
 675 extern bool c_cpp_error (cpp_reader *, int, location_t, unsigned int,
 676                          const char *, va_list *)
 677      ATTRIBUTE_GCC_CDIAG(5,0);
 678
 679 #endif /* ! GCC_C_TREE_H */