gcc/c/c-tree.h

   1 /* Definitions for C parsing and type checking.
   2    Copyright (C) 1987-2017 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 #define C_IS_RESERVED_WORD(ID) TREE_LANG_FLAG_0 (ID)
  48
  49 /* Record whether a type or decl was written with nonconstant size.
  50    Note that TYPE_SIZE may have simplified to a constant.  */
  51 #define C_TYPE_VARIABLE_SIZE(TYPE) TYPE_LANG_FLAG_1 (TYPE)
  52 #define C_DECL_VARIABLE_SIZE(TYPE) DECL_LANG_FLAG_0 (TYPE)
  53
  54 /* Record whether a type is defined inside a struct or union type.
  55    This is used for -Wc++-compat. */
  56 #define C_TYPE_DEFINED_IN_STRUCT(TYPE) TYPE_LANG_FLAG_2 (TYPE)
  57
  58 /* Record whether an "incomplete type" error was given for the type.  */
  59 #define C_TYPE_ERROR_REPORTED(TYPE) TYPE_LANG_FLAG_3 (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 a PARM_DECL, nonzero if it was declared as an array.  */
  72 #define C_ARRAY_PARAMETER(NODE) DECL_LANG_FLAG_0 (NODE)
  73
  74 /* For FUNCTION_DECLs, evaluates true if the decl is built-in but has
  75    been declared.  */
  76 #define C_DECL_DECLARED_BUILTIN(EXP)            \
  77   DECL_LANG_FLAG_3 (FUNCTION_DECL_CHECK (EXP))
  78
  79 /* For FUNCTION_DECLs, evaluates true if the decl is built-in, has a
  80    built-in prototype and does not have a non-built-in prototype.  */
  81 #define C_DECL_BUILTIN_PROTOTYPE(EXP)           \
  82   DECL_LANG_FLAG_6 (FUNCTION_DECL_CHECK (EXP))
  83
  84 /* Record whether a decl was declared register.  This is strictly a
  85    front-end flag, whereas DECL_REGISTER is used for code generation;
  86    they may differ for structures with volatile fields.  */
  87 #define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4 (EXP)
  88
  89 /* Record whether a decl was used in an expression anywhere except an
  90    unevaluated operand of sizeof / typeof / alignof.  This is only
  91    used for functions declared static but not defined, though outside
  92    sizeof and typeof it is set for other function decls as well.  */
  93 #define C_DECL_USED(EXP) DECL_LANG_FLAG_5 (FUNCTION_DECL_CHECK (EXP))
  94
  95 /* Record whether a variable has been declared threadprivate by
  96    #pragma omp threadprivate.  */
  97 #define C_DECL_THREADPRIVATE_P(DECL) DECL_LANG_FLAG_3 (VAR_DECL_CHECK (DECL))
  98
  99 /* Nonzero for a decl which either doesn't exist or isn't a prototype.
 100    N.B. Could be simplified if all built-in decls had complete prototypes
 101    (but this is presently difficult because some of them need FILE*).  */
 102 #define C_DECL_ISNT_PROTOTYPE(EXP)                      \
 103        (EXP == 0                                        \
 104         || (!prototype_p (TREE_TYPE (EXP))      \
 105             && !DECL_BUILT_IN (EXP)))
 106
 107 /* For FUNCTION_TYPE, a hidden list of types of arguments.  The same as
 108    TYPE_ARG_TYPES for functions with prototypes, but created for functions
 109    without prototypes.  */
 110 #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_LANG_SLOT_1 (NODE)
 111
 112 /* For a CONSTRUCTOR, whether some initializer contains a
 113    subexpression meaning it is not a constant expression.  */
 114 #define CONSTRUCTOR_NON_CONST(EXPR) TREE_LANG_FLAG_1 (CONSTRUCTOR_CHECK (EXPR))
 115
 116 /* Record parser information about an expression that is irrelevant
 117    for code generation alongside a tree representing its value.  */
 118 struct c_expr
 119 {
 120   /* The value of the expression.  */
 121   tree value;
 122   /* Record the original unary/binary operator of an expression, which may
 123      have been changed by fold, STRING_CST for unparenthesized string
 124      constants, C_MAYBE_CONST_EXPR for __builtin_constant_p calls
 125      (even if parenthesized), for subexpressions, and for non-constant
 126      initializers, or ERROR_MARK for other expressions (including
 127      parenthesized expressions).  */
 128   enum tree_code original_code;
 129   /* If not NULL, the original type of an expression.  This will
 130      differ from the type of the value field for an enum constant.
 131      The type of an enum constant is a plain integer type, but this
 132      field will be the enum type.  */
 133   tree original_type;
 134
 135   /* The source range of this expression.  This is redundant
 136      for node values that have locations, but not all node kinds
 137      have locations (e.g. constants, and references to params, locals,
 138      etc), so we stash a copy here.  */
 139   source_range src_range;
 140
 141   /* Access to the first and last locations within the source spelling
 142      of this expression.  */
 143   location_t get_start () const { return src_range.m_start; }
 144   location_t get_finish () const { return src_range.m_finish; }
 145
 146   /* Set the value to error_mark_node whilst ensuring that src_range
 147      is initialized.  */
 148   void set_error ()
 149   {
 150     value = error_mark_node;
 151     src_range.m_start = UNKNOWN_LOCATION;
 152     src_range.m_finish = UNKNOWN_LOCATION;
 153   }
 154 };
 155
 156 /* Type alias for struct c_expr. This allows to use the structure
 157    inside the VEC types.  */
 158 typedef struct c_expr c_expr_t;
 159
 160 /* A kind of type specifier.  Note that this information is currently
 161    only used to distinguish tag definitions, tag references and typeof
 162    uses.  */
 163 enum c_typespec_kind {
 164   /* No typespec.  This appears only in struct c_declspec.  */
 165   ctsk_none,
 166   /* A reserved keyword type specifier.  */
 167   ctsk_resword,
 168   /* A reference to a tag, previously declared, such as "struct foo".
 169      This includes where the previous declaration was as a different
 170      kind of tag, in which case this is only valid if shadowing that
 171      tag in an inner scope.  */
 172   ctsk_tagref,
 173   /* A reference to a tag, not previously declared in a visible
 174      scope.  */
 175   ctsk_tagfirstref,
 176   /* A definition of a tag such as "struct foo { int a; }".  */
 177   ctsk_tagdef,
 178   /* A typedef name.  */
 179   ctsk_typedef,
 180   /* An ObjC-specific kind of type specifier.  */
 181   ctsk_objc,
 182   /* A typeof specifier, or _Atomic ( type-name ).  */
 183   ctsk_typeof
 184 };
 185
 186 /* A type specifier: this structure is created in the parser and
 187    passed to declspecs_add_type only.  */
 188 struct c_typespec {
 189   /* What kind of type specifier this is.  */
 190   enum c_typespec_kind kind;
 191   /* Whether the expression has operands suitable for use in constant
 192      expressions.  */
 193   bool expr_const_operands;
 194   /* The specifier itself.  */
 195   tree spec;
 196   /* An expression to be evaluated before the type specifier, in the
 197      case of typeof specifiers, or NULL otherwise or if no such
 198      expression is required for a particular typeof specifier.  In
 199      particular, when typeof is applied to an expression of variably
 200      modified type, that expression must be evaluated in order to
 201      determine array sizes that form part of the type, but the
 202      expression itself (as opposed to the array sizes) forms no part
 203      of the type and so needs to be recorded separately.  */
 204   tree expr;
 205 };
 206
 207 /* A storage class specifier.  */
 208 enum c_storage_class {
 209   csc_none,
 210   csc_auto,
 211   csc_extern,
 212   csc_register,
 213   csc_static,
 214   csc_typedef
 215 };
 216
 217 /* A type specifier keyword "void", "_Bool", "char", "int", "float",
 218    "double", "_Decimal32", "_Decimal64", "_Decimal128", "_Fract", "_Accum",
 219    or none of these.  */
 220 enum c_typespec_keyword {
 221   cts_none,
 222   cts_void,
 223   cts_bool,
 224   cts_char,
 225   cts_int,
 226   cts_float,
 227   cts_int_n,
 228   cts_double,
 229   cts_dfloat32,
 230   cts_dfloat64,
 231   cts_dfloat128,
 232   cts_floatn_nx,
 233   cts_fract,
 234   cts_accum,
 235   cts_auto_type
 236 };
 237
 238 /* This enum lists all the possible declarator specifiers, storage
 239    class or attribute that a user can write.  There is at least one
 240    enumerator per possible declarator specifier in the struct
 241    c_declspecs below.
 242
 243    It is used to index the array of declspec locations in struct
 244    c_declspecs.  */
 245 enum c_declspec_word {
 246   cdw_typespec /* A catch-all for a typespec.  */,
 247   cdw_storage_class  /* A catch-all for a storage class */,
 248   cdw_attributes,
 249   cdw_typedef,
 250   cdw_explicit_signed,
 251   cdw_deprecated,
 252   cdw_default_int,
 253   cdw_long,
 254   cdw_long_long,
 255   cdw_short,
 256   cdw_signed,
 257   cdw_unsigned,
 258   cdw_complex,
 259   cdw_inline,
 260   cdw_noreturn,
 261   cdw_thread,
 262   cdw_const,
 263   cdw_volatile,
 264   cdw_restrict,
 265   cdw_atomic,
 266   cdw_saturating,
 267   cdw_alignas,
 268   cdw_address_space,
 269   cdw_gimple,
 270   cdw_rtl,
 271   cdw_number_of_elements /* This one must always be the last
 272                             enumerator.  */
 273 };
 274
 275 /* A sequence of declaration specifiers in C.  When a new declaration
 276    specifier is added, please update the enum c_declspec_word above
 277    accordingly.  */
 278 struct c_declspecs {
 279   source_location locations[cdw_number_of_elements];
 280   /* The type specified, if a single type specifier such as a struct,
 281      union or enum specifier, typedef name or typeof specifies the
 282      whole type, or NULL_TREE if none or a keyword such as "void" or
 283      "char" is used.  Does not include qualifiers.  */
 284   tree type;
 285   /* Any expression to be evaluated before the type, from a typeof
 286      specifier.  */
 287   tree expr;
 288   /* The attributes from a typedef decl.  */
 289   tree decl_attr;
 290   /* When parsing, the attributes.  Outside the parser, this will be
 291      NULL; attributes (possibly from multiple lists) will be passed
 292      separately.  */
 293   tree attrs;
 294   /* The pass to start compiling a __GIMPLE or __RTL function with.  */
 295   char *gimple_or_rtl_pass;
 296   /* The base-2 log of the greatest alignment required by an _Alignas
 297      specifier, in bytes, or -1 if no such specifiers with nonzero
 298      alignment.  */
 299   int align_log;
 300   /* For the __intN declspec, this stores the index into the int_n_* arrays.  */
 301   int int_n_idx;
 302   /* For the _FloatN and _FloatNx declspec, this stores the index into
 303      the floatn_nx_types array.  */
 304   int floatn_nx_idx;
 305   /* The storage class specifier, or csc_none if none.  */
 306   enum c_storage_class storage_class;
 307   /* Any type specifier keyword used such as "int", not reflecting
 308      modifiers such as "short", or cts_none if none.  */
 309   ENUM_BITFIELD (c_typespec_keyword) typespec_word : 8;
 310   /* The kind of type specifier if one has been seen, ctsk_none
 311      otherwise.  */
 312   ENUM_BITFIELD (c_typespec_kind) typespec_kind : 3;
 313   /* Whether any expressions in typeof specifiers may appear in
 314      constant expressions.  */
 315   BOOL_BITFIELD expr_const_operands : 1;
 316   /* Whether any declaration specifiers have been seen at all.  */
 317   BOOL_BITFIELD declspecs_seen_p : 1;
 318   /* Whether something other than a storage class specifier or
 319      attribute has been seen.  This is used to warn for the
 320      obsolescent usage of storage class specifiers other than at the
 321      start of the list.  (Doing this properly would require function
 322      specifiers to be handled separately from storage class
 323      specifiers.)  */
 324   BOOL_BITFIELD non_sc_seen_p : 1;
 325   /* Whether the type is specified by a typedef or typeof name.  */
 326   BOOL_BITFIELD typedef_p : 1;
 327   /* Whether the type is explicitly "signed" or specified by a typedef
 328      whose type is explicitly "signed".  */
 329   BOOL_BITFIELD explicit_signed_p : 1;
 330   /* Whether the specifiers include a deprecated typedef.  */
 331   BOOL_BITFIELD deprecated_p : 1;
 332   /* Whether the type defaulted to "int" because there were no type
 333      specifiers.  */
 334   BOOL_BITFIELD default_int_p : 1;
 335   /* Whether "long" was specified.  */
 336   BOOL_BITFIELD long_p : 1;
 337   /* Whether "long" was specified more than once.  */
 338   BOOL_BITFIELD long_long_p : 1;
 339   /* Whether "short" was specified.  */
 340   BOOL_BITFIELD short_p : 1;
 341   /* Whether "signed" was specified.  */
 342   BOOL_BITFIELD signed_p : 1;
 343   /* Whether "unsigned" was specified.  */
 344   BOOL_BITFIELD unsigned_p : 1;
 345   /* Whether "complex" was specified.  */
 346   BOOL_BITFIELD complex_p : 1;
 347   /* Whether "inline" was specified.  */
 348   BOOL_BITFIELD inline_p : 1;
 349   /* Whether "_Noreturn" was speciied.  */
 350   BOOL_BITFIELD noreturn_p : 1;
 351   /* Whether "__thread" or "_Thread_local" was specified.  */
 352   BOOL_BITFIELD thread_p : 1;
 353   /* Whether "__thread" rather than "_Thread_local" was specified.  */
 354   BOOL_BITFIELD thread_gnu_p : 1;
 355   /* Whether "const" was specified.  */
 356   BOOL_BITFIELD const_p : 1;
 357   /* Whether "volatile" was specified.  */
 358   BOOL_BITFIELD volatile_p : 1;
 359   /* Whether "restrict" was specified.  */
 360   BOOL_BITFIELD restrict_p : 1;
 361   /* Whether "_Atomic" was specified.  */
 362   BOOL_BITFIELD atomic_p : 1;
 363   /* Whether "_Sat" was specified.  */
 364   BOOL_BITFIELD saturating_p : 1;
 365   /* Whether any alignment specifier (even with zero alignment) was
 366      specified.  */
 367   BOOL_BITFIELD alignas_p : 1;
 368   /* Whether any __GIMPLE specifier was specified.  */
 369   BOOL_BITFIELD gimple_p : 1;
 370   /* Whether any __RTL specifier was specified.  */
 371   BOOL_BITFIELD rtl_p : 1;
 372   /* The address space that the declaration belongs to.  */
 373   addr_space_t address_space;
 374 };
 375
 376 /* The various kinds of declarators in C.  */
 377 enum c_declarator_kind {
 378   /* An identifier.  */
 379   cdk_id,
 380   /* A function.  */
 381   cdk_function,
 382   /* An array.  */
 383   cdk_array,
 384   /* A pointer.  */
 385   cdk_pointer,
 386   /* Parenthesized declarator with nested attributes.  */
 387   cdk_attrs
 388 };
 389
 390 struct c_arg_tag {
 391   /* The argument name.  */
 392   tree id;
 393   /* The type of the argument.  */
 394   tree type;
 395 };
 396
 397
 398 /* Information about the parameters in a function declarator.  */
 399 struct c_arg_info {
 400   /* A list of parameter decls.  */
 401   tree parms;
 402   /* A list of structure, union and enum tags defined.  */
 403   vec<c_arg_tag, va_gc> *tags;
 404   /* A list of argument types to go in the FUNCTION_TYPE.  */
 405   tree types;
 406   /* A list of non-parameter decls (notably enumeration constants)
 407      defined with the parameters.  */
 408   tree others;
 409   /* A compound expression of VLA sizes from the parameters, or NULL.
 410      In a function definition, these are used to ensure that
 411      side-effects in sizes of arrays converted to pointers (such as a
 412      parameter int i[n++]) take place; otherwise, they are
 413      ignored.  */
 414   tree pending_sizes;
 415   /* True when these arguments had [*].  */
 416   BOOL_BITFIELD had_vla_unspec : 1;
 417 };
 418
 419 /* A declarator.  */
 420 struct c_declarator {
 421   /* The kind of declarator.  */
 422   enum c_declarator_kind kind;
 423   location_t id_loc; /* Currently only set for cdk_id, cdk_array. */
 424   /* Except for cdk_id, the contained declarator.  For cdk_id, NULL.  */
 425   struct c_declarator *declarator;
 426   union {
 427     /* For identifiers, an IDENTIFIER_NODE or NULL_TREE if an abstract
 428        declarator.  */
 429     tree id;
 430     /* For functions.  */
 431     struct c_arg_info *arg_info;
 432     /* For arrays.  */
 433     struct {
 434       /* The array dimension, or NULL for [] and [*].  */
 435       tree dimen;
 436       /* The qualifiers inside [].  */
 437       int quals;
 438       /* The attributes (currently ignored) inside [].  */
 439       tree attrs;
 440       /* Whether [static] was used.  */
 441       BOOL_BITFIELD static_p : 1;
 442       /* Whether [*] was used.  */
 443       BOOL_BITFIELD vla_unspec_p : 1;
 444     } array;
 445     /* For pointers, the qualifiers on the pointer type.  */
 446     int pointer_quals;
 447     /* For attributes.  */
 448     tree attrs;
 449   } u;
 450 };
 451
 452 /* A type name.  */
 453 struct c_type_name {
 454   /* The declaration specifiers.  */
 455   struct c_declspecs *specs;
 456   /* The declarator.  */
 457   struct c_declarator *declarator;
 458 };
 459
 460 /* A parameter.  */
 461 struct c_parm {
 462   /* The declaration specifiers, minus any prefix attributes.  */
 463   struct c_declspecs *specs;
 464   /* The attributes.  */
 465   tree attrs;
 466   /* The declarator.  */
 467   struct c_declarator *declarator;
 468 };
 469
 470 /* Used when parsing an enum.  Initialized by start_enum.  */
 471 struct c_enum_contents
 472 {
 473   /* While defining an enum type, this is 1 plus the last enumerator
 474      constant value.  */
 475   tree enum_next_value;
 476
 477   /* Nonzero means that there was overflow computing enum_next_value.  */
 478   int enum_overflow;
 479 };
 480
 481 /* A type of reference to a static identifier in an inline
 482    function.  */
 483 enum c_inline_static_type {
 484   /* Identifier with internal linkage used in function that may be an
 485      inline definition (i.e., file-scope static).  */
 486   csi_internal,
 487   /* Modifiable object with static storage duration defined in
 488      function that may be an inline definition (i.e., local
 489      static).  */
 490   csi_modifiable
 491 };
 492
 493 \f
 494 /* in c-parser.c */
 495 extern void c_parse_init (void);
 496 extern bool c_keyword_starts_typename (enum rid keyword);
 497
 498 /* in c-aux-info.c */
 499 extern void gen_aux_info_record (tree, int, int, int);
 500
 501 /* in c-decl.c */
 502 struct c_spot_bindings;
 503 struct c_struct_parse_info;
 504 extern struct obstack parser_obstack;
 505 extern tree c_break_label;
 506 extern tree c_cont_label;
 507
 508 extern bool global_bindings_p (void);
 509 extern void push_scope (void);
 510 extern tree pop_scope (void);
 511 extern void c_bindings_start_stmt_expr (struct c_spot_bindings *);
 512 extern void c_bindings_end_stmt_expr (struct c_spot_bindings *);
 513
 514 extern void record_inline_static (location_t, tree, tree,
 515                                   enum c_inline_static_type);
 516 extern void c_init_decl_processing (void);
 517 extern void c_print_identifier (FILE *, tree, int);
 518 extern int quals_from_declspecs (const struct c_declspecs *);
 519 extern struct c_declarator *build_array_declarator (location_t, tree,
 520                                                     struct c_declspecs *,
 521                                                     bool, bool);
 522 extern tree build_enumerator (location_t, location_t, struct c_enum_contents *,
 523                               tree, tree);
 524 extern tree check_for_loop_decls (location_t, bool);
 525 extern void mark_forward_parm_decls (void);
 526 extern void declare_parm_level (void);
 527 extern void undeclared_variable (location_t, tree);
 528 extern tree lookup_label_for_goto (location_t, tree);
 529 extern tree declare_label (tree);
 530 extern tree define_label (location_t, tree);
 531 extern struct c_spot_bindings *c_get_switch_bindings (void);
 532 extern void c_release_switch_bindings (struct c_spot_bindings *);
 533 extern bool c_check_switch_jump_warnings (struct c_spot_bindings *,
 534                                           location_t, location_t);
 535 extern void finish_decl (tree, location_t, tree, tree, tree);
 536 extern tree finish_enum (tree, tree, tree);
 537 extern void finish_function (void);
 538 extern tree finish_struct (location_t, tree, tree, tree,
 539                            struct c_struct_parse_info *);
 540 extern struct c_arg_info *build_arg_info (void);
 541 extern struct c_arg_info *get_parm_info (bool, tree);
 542 extern tree grokfield (location_t, struct c_declarator *,
 543                        struct c_declspecs *, tree, tree *);
 544 extern tree groktypename (struct c_type_name *, tree *, bool *);
 545 extern tree grokparm (const struct c_parm *, tree *);
 546 extern tree implicitly_declare (location_t, tree);
 547 extern void keep_next_level (void);
 548 extern void pending_xref_error (void);
 549 extern void c_push_function_context (void);
 550 extern void c_pop_function_context (void);
 551 extern void push_parm_decl (const struct c_parm *, tree *);
 552 extern struct c_declarator *set_array_declarator_inner (struct c_declarator *,
 553                                                         struct c_declarator *);
 554 extern tree c_builtin_function (tree);
 555 extern tree c_builtin_function_ext_scope (tree);
 556 extern void shadow_tag (const struct c_declspecs *);
 557 extern void shadow_tag_warned (const struct c_declspecs *, int);
 558 extern tree start_enum (location_t, struct c_enum_contents *, tree);
 559 extern int  start_function (struct c_declspecs *, struct c_declarator *, tree);
 560 extern tree start_decl (struct c_declarator *, struct c_declspecs *, bool,
 561                         tree);
 562 extern tree start_struct (location_t, enum tree_code, tree,
 563                           struct c_struct_parse_info **);
 564 extern void store_parm_decls (void);
 565 extern void store_parm_decls_from (struct c_arg_info *);
 566 extern void temp_store_parm_decls (tree, tree);
 567 extern void temp_pop_parm_decls (void);
 568 extern tree xref_tag (enum tree_code, tree);
 569 extern struct c_typespec parser_xref_tag (location_t, enum tree_code, tree);
 570 extern struct c_parm *build_c_parm (struct c_declspecs *, tree,
 571                                     struct c_declarator *);
 572 extern struct c_declarator *build_attrs_declarator (tree,
 573                                                     struct c_declarator *);
 574 extern struct c_declarator *build_function_declarator (struct c_arg_info *,
 575                                                        struct c_declarator *);
 576 extern struct c_declarator *build_id_declarator (tree);
 577 extern struct c_declarator *make_pointer_declarator (struct c_declspecs *,
 578                                                      struct c_declarator *);
 579 extern struct c_declspecs *build_null_declspecs (void);
 580 extern struct c_declspecs *declspecs_add_qual (source_location,
 581                                                struct c_declspecs *, tree);
 582 extern struct c_declspecs *declspecs_add_type (location_t,
 583                                                struct c_declspecs *,
 584                                                struct c_typespec);
 585 extern struct c_declspecs *declspecs_add_scspec (source_location,
 586                                                  struct c_declspecs *, tree);
 587 extern struct c_declspecs *declspecs_add_attrs (source_location,
 588                                                 struct c_declspecs *, tree);
 589 extern struct c_declspecs *declspecs_add_addrspace (source_location,
 590                                                     struct c_declspecs *,
 591                                                     addr_space_t);
 592 extern struct c_declspecs *declspecs_add_alignas (source_location,
 593                                                   struct c_declspecs *, tree);
 594 extern struct c_declspecs *finish_declspecs (struct c_declspecs *);
 595
 596 /* in c-objc-common.c */
 597 extern bool c_objc_common_init (void);
 598 extern bool c_missing_noreturn_ok_p (tree);
 599 extern bool c_warn_unused_global_decl (const_tree);
 600 extern void c_initialize_diagnostics (diagnostic_context *);
 601 extern bool c_vla_unspec_p (tree x, tree fn);
 602
 603 /* in c-typeck.c */
 604 extern int in_alignof;
 605 extern int in_sizeof;
 606 extern int in_typeof;
 607
 608 extern tree c_last_sizeof_arg;
 609
 610 extern struct c_switch *c_switch_stack;
 611
 612 extern tree c_objc_common_truthvalue_conversion (location_t, tree);
 613 extern tree require_complete_type (location_t, tree);
 614 extern int same_translation_unit_p (const_tree, const_tree);
 615 extern int comptypes (tree, tree);
 616 extern int comptypes_check_different_types (tree, tree, bool *);
 617 extern bool c_vla_type_p (const_tree);
 618 extern bool c_mark_addressable (tree, bool = false);
 619 extern void c_incomplete_type_error (location_t, const_tree, const_tree);
 620 extern tree c_type_promotes_to (tree);
 621 extern struct c_expr default_function_array_conversion (location_t,
 622                                                         struct c_expr);
 623 extern struct c_expr default_function_array_read_conversion (location_t,
 624                                                              struct c_expr);
 625 extern struct c_expr convert_lvalue_to_rvalue (location_t, struct c_expr,
 626                                                bool, bool);
 627 extern void mark_exp_read (tree);
 628 extern tree composite_type (tree, tree);
 629 extern tree build_component_ref (location_t, tree, tree, location_t);
 630 extern tree build_array_ref (location_t, tree, tree);
 631 extern tree build_external_ref (location_t, tree, int, tree *);
 632 extern void pop_maybe_used (bool);
 633 extern struct c_expr c_expr_sizeof_expr (location_t, struct c_expr);
 634 extern struct c_expr c_expr_sizeof_type (location_t, struct c_type_name *);
 635 extern struct c_expr parser_build_unary_op (location_t, enum tree_code,
 636                                             struct c_expr);
 637 extern struct c_expr parser_build_binary_op (location_t,
 638                                              enum tree_code, struct c_expr,
 639                                              struct c_expr);
 640 extern tree build_conditional_expr (location_t, tree, bool, tree, tree,
 641                                     tree, tree);
 642 extern tree build_compound_expr (location_t, tree, tree);
 643 extern tree c_cast_expr (location_t, struct c_type_name *, tree);
 644 extern tree build_c_cast (location_t, tree, tree);
 645 extern void store_init_value (location_t, tree, tree, tree);
 646 extern void maybe_warn_string_init (location_t, tree, struct c_expr);
 647 extern void start_init (tree, tree, int, rich_location *);
 648 extern void finish_init (void);
 649 extern void really_start_incremental_init (tree);
 650 extern void finish_implicit_inits (location_t, struct obstack *);
 651 extern void push_init_level (location_t, int, struct obstack *);
 652 extern struct c_expr pop_init_level (location_t, int, struct obstack *,
 653                                      location_t);
 654 extern void set_init_index (location_t, tree, tree, struct obstack *);
 655 extern void set_init_label (location_t, tree, location_t, struct obstack *);
 656 extern void process_init_element (location_t, struct c_expr, bool,
 657                                   struct obstack *);
 658 extern tree build_compound_literal (location_t, tree, tree, bool);
 659 extern void check_compound_literal_type (location_t, struct c_type_name *);
 660 extern tree c_start_case (location_t, location_t, tree, bool);
 661 extern void c_finish_case (tree, tree);
 662 extern tree build_asm_expr (location_t, tree, tree, tree, tree, tree, bool);
 663 extern tree build_asm_stmt (tree, tree);
 664 extern int c_types_compatible_p (tree, tree);
 665 extern tree c_begin_compound_stmt (bool);
 666 extern tree c_end_compound_stmt (location_t, tree, bool);
 667 extern void c_finish_if_stmt (location_t, tree, tree, tree);
 668 extern void c_finish_loop (location_t, tree, tree, tree, tree, tree, bool);
 669 extern tree c_begin_stmt_expr (void);
 670 extern tree c_finish_stmt_expr (location_t, tree);
 671 extern tree c_process_expr_stmt (location_t, tree);
 672 extern tree c_finish_expr_stmt (location_t, tree);
 673 extern tree c_finish_return (location_t, tree, tree);
 674 extern tree c_finish_bc_stmt (location_t, tree *, bool);
 675 extern tree c_finish_goto_label (location_t, tree);
 676 extern tree c_finish_goto_ptr (location_t, tree);
 677 extern tree c_expr_to_decl (tree, bool *, bool *);
 678 extern tree c_finish_omp_construct (location_t, enum tree_code, tree, tree);
 679 extern tree c_finish_oacc_data (location_t, tree, tree);
 680 extern tree c_finish_oacc_host_data (location_t, tree, tree);
 681 extern tree c_begin_omp_parallel (void);
 682 extern tree c_finish_omp_parallel (location_t, tree, tree);
 683 extern tree c_begin_omp_task (void);
 684 extern tree c_finish_omp_task (location_t, tree, tree);
 685 extern void c_finish_omp_cancel (location_t, tree);
 686 extern void c_finish_omp_cancellation_point (location_t, tree);
 687 extern tree c_finish_omp_clauses (tree, enum c_omp_region_type);
 688 extern tree c_build_va_arg (location_t, tree, location_t, tree);
 689 extern tree c_finish_transaction (location_t, tree, int);
 690 extern bool c_tree_equal (tree, tree);
 691 extern tree c_build_function_call_vec (location_t, vec<location_t>, tree,
 692                                        vec<tree, va_gc> *, vec<tree, va_gc> *);
 693 extern tree c_omp_clause_copy_ctor (tree, tree, tree);
 694
 695 /* Set to 0 at beginning of a function definition, set to 1 if
 696    a return statement that specifies a return value is seen.  */
 697
 698 extern int current_function_returns_value;
 699
 700 /* Set to 0 at beginning of a function definition, set to 1 if
 701    a return statement with no argument is seen.  */
 702
 703 extern int current_function_returns_null;
 704
 705 /* Set to 0 at beginning of a function definition, set to 1 if
 706    a call to a noreturn function is seen.  */
 707
 708 extern int current_function_returns_abnormally;
 709
 710 /* In c-decl.c */
 711
 712 /* Tell the binding oracle what kind of binding we are looking for.  */
 713
 714 enum c_oracle_request
 715 {
 716   C_ORACLE_SYMBOL,
 717   C_ORACLE_TAG,
 718   C_ORACLE_LABEL
 719 };
 720
 721 /* If this is non-NULL, then it is a "binding oracle" which can lazily
 722    create bindings when needed by the C compiler.  The oracle is told
 723    the name and type of the binding to create.  It can call pushdecl
 724    or the like to ensure the binding is visible; or do nothing,
 725    leaving the binding untouched.  c-decl.c takes note of when the
 726    oracle has been called and will not call it again if it fails to
 727    create a given binding.  */
 728
 729 typedef void c_binding_oracle_function (enum c_oracle_request, tree identifier);
 730
 731 extern c_binding_oracle_function *c_binding_oracle;
 732
 733 extern void c_finish_incomplete_decl (tree);
 734 extern tree c_omp_reduction_id (enum tree_code, tree);
 735 extern tree c_omp_reduction_decl (tree);
 736 extern tree c_omp_reduction_lookup (tree, tree);
 737 extern tree c_check_omp_declare_reduction_r (tree *, int *, void *);
 738 extern void c_pushtag (location_t, tree, tree);
 739 extern void c_bind (location_t, tree, bool);
 740 extern bool tag_exists_p (enum tree_code, tree);
 741
 742 /* In c-errors.c */
 743 extern bool pedwarn_c90 (location_t, int opt, const char *, ...)
 744     ATTRIBUTE_GCC_DIAG(3,4);
 745 extern bool pedwarn_c99 (location_t, int opt, const char *, ...)
 746     ATTRIBUTE_GCC_DIAG(3,4);
 747
 748 extern void
 749 set_c_expr_source_range (c_expr *expr,
 750                          location_t start, location_t finish);
 751
 752 extern void
 753 set_c_expr_source_range (c_expr *expr,
 754                          source_range src_range);
 755
 756 /* In c-fold.c */
 757 extern tree decl_constant_value_for_optimization (tree);
 758
 759 extern vec<tree> incomplete_record_decls;
 760
 761 #endif /* ! GCC_C_TREE_H */