gcc/tree-core.h

   1 /* Core data structures for the 'tree' type.
   2    Copyright (C) 1989-2015 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_TREE_CORE_H
  21 #define GCC_TREE_CORE_H
  22
  23 #include "symtab.h"
  24
  25 /* This file contains all the data structures that define the 'tree' type.
  26    There are no accessor macros nor functions in this file. Only the
  27    basic data structures, extern declarations and type definitions.  */
  28
  29 /*---------------------------------------------------------------------------
  30    Forward type declarations.  Mostly to avoid including unnecessary headers
  31 ---------------------------------------------------------------------------*/
  32 struct function;
  33 struct real_value;
  34 struct fixed_value;
  35 struct ptr_info_def;
  36 struct range_info_def;
  37 struct die_struct;
  38
  39
  40 /*---------------------------------------------------------------------------
  41                               #defined constants
  42 ---------------------------------------------------------------------------*/
  43 /* Nonzero if this is a call to a function whose return value depends
  44    solely on its arguments, has no side effects, and does not read
  45    global memory.  This corresponds to TREE_READONLY for function
  46    decls.  */
  47 #define ECF_CONST                 (1 << 0)
  48
  49 /* Nonzero if this is a call to "pure" function (like const function,
  50    but may read memory.  This corresponds to DECL_PURE_P for function
  51    decls.  */
  52 #define ECF_PURE                  (1 << 1)
  53
  54 /* Nonzero if this is ECF_CONST or ECF_PURE but cannot be proven to no
  55    infinite loop.  This corresponds to DECL_LOOPING_CONST_OR_PURE_P
  56    for function decls.*/
  57 #define ECF_LOOPING_CONST_OR_PURE (1 << 2)
  58
  59 /* Nonzero if this call will never return.  */
  60 #define ECF_NORETURN              (1 << 3)
  61
  62 /* Nonzero if this is a call to malloc or a related function.  */
  63 #define ECF_MALLOC                (1 << 4)
  64
  65 /* Nonzero if it is plausible that this is a call to alloca.  */
  66 #define ECF_MAY_BE_ALLOCA         (1 << 5)
  67
  68 /* Nonzero if this is a call to a function that won't throw an exception.  */
  69 #define ECF_NOTHROW               (1 << 6)
  70
  71 /* Nonzero if this is a call to setjmp or a related function.  */
  72 #define ECF_RETURNS_TWICE         (1 << 7)
  73
  74 /* Nonzero if this call replaces the current stack frame.  */
  75 #define ECF_SIBCALL               (1 << 8)
  76
  77 /* Function does not read or write memory (but may have side effects, so
  78    it does not necessarily fit ECF_CONST).  */
  79 #define ECF_NOVOPS                (1 << 9)
  80
  81 /* The function does not lead to calls within current function unit.  */
  82 #define ECF_LEAF                  (1 << 10)
  83
  84 /* Nonzero if this call does not affect transactions.  */
  85 #define ECF_TM_PURE               (1 << 11)
  86
  87 /* Nonzero if this call is into the transaction runtime library.  */
  88 #define ECF_TM_BUILTIN            (1 << 12)
  89
  90 /* Call argument flags.  */
  91 /* Nonzero if the argument is not dereferenced recursively, thus only
  92    directly reachable memory is read or written.  */
  93 #define EAF_DIRECT              (1 << 0)
  94
  95 /* Nonzero if memory reached by the argument is not clobbered.  */
  96 #define EAF_NOCLOBBER           (1 << 1)
  97
  98 /* Nonzero if the argument does not escape.  */
  99 #define EAF_NOESCAPE            (1 << 2)
 100
 101 /* Nonzero if the argument is not used by the function.  */
 102 #define EAF_UNUSED              (1 << 3)
 103
 104 /* Call return flags.  */
 105 /* Mask for the argument number that is returned.  Lower two bits of
 106    the return flags, encodes argument slots zero to three.  */
 107 #define ERF_RETURN_ARG_MASK     (3)
 108
 109 /* Nonzero if the return value is equal to the argument number
 110    flags & ERF_RETURN_ARG_MASK.  */
 111 #define ERF_RETURNS_ARG         (1 << 2)
 112
 113 /* Nonzero if the return value does not alias with anything.  Functions
 114    with the malloc attribute have this set on their return value.  */
 115 #define ERF_NOALIAS             (1 << 3)
 116
 117
 118 /*---------------------------------------------------------------------------
 119                                   Enumerations
 120 ---------------------------------------------------------------------------*/
 121 /* Codes of tree nodes.  */
 122 #define DEFTREECODE(SYM, STRING, TYPE, NARGS)   SYM,
 123 #define END_OF_BASE_TREE_CODES LAST_AND_UNUSED_TREE_CODE,
 124
 125 enum tree_code {
 126 #include "all-tree.def"
 127 MAX_TREE_CODES
 128 };
 129
 130 #undef DEFTREECODE
 131 #undef END_OF_BASE_TREE_CODES
 132
 133 /* Number of language-independent tree codes.  */
 134 #define NUM_TREE_CODES \
 135   ((int) LAST_AND_UNUSED_TREE_CODE)
 136
 137 #define CODE_CONTAINS_STRUCT(CODE, STRUCT) \
 138   (tree_contains_struct[(CODE)][(STRUCT)])
 139
 140
 141 /* Classify which part of the compiler has defined a given builtin function.
 142    Note that we assume below that this is no more than two bits.  */
 143 enum built_in_class {
 144   NOT_BUILT_IN = 0,
 145   BUILT_IN_FRONTEND,
 146   BUILT_IN_MD,
 147   BUILT_IN_NORMAL
 148 };
 149
 150 /* Last marker used for LTO stremaing of built_in_class.  We can not add it
 151    to the enum since we need the enumb to fit in 2 bits.  */
 152 #define BUILT_IN_LAST (BUILT_IN_NORMAL + 1)
 153
 154 /* Codes that identify the various built in functions
 155    so that expand_call can identify them quickly.  */
 156 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) ENUM,
 157 enum built_in_function {
 158 #include "builtins.def"
 159
 160   BEGIN_CHKP_BUILTINS,
 161
 162 #undef DEF_BUILTIN
 163 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND)
 164 #undef DEF_BUILTIN_CHKP
 165 #define DEF_BUILTIN_CHKP(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) \
 166   ENUM##_CHKP = ENUM + BEGIN_CHKP_BUILTINS + 1,
 167 #include "builtins.def"
 168 #undef DEF_BUILTIN_CHKP
 169
 170   END_CHKP_BUILTINS = BEGIN_CHKP_BUILTINS * 2 + 1,
 171
 172   /* Complex division routines in libgcc.  These are done via builtins
 173      because emit_library_call_value can't handle complex values.  */
 174   BUILT_IN_COMPLEX_MUL_MIN,
 175   BUILT_IN_COMPLEX_MUL_MAX
 176     = BUILT_IN_COMPLEX_MUL_MIN
 177       + MAX_MODE_COMPLEX_FLOAT
 178       - MIN_MODE_COMPLEX_FLOAT,
 179
 180   BUILT_IN_COMPLEX_DIV_MIN,
 181   BUILT_IN_COMPLEX_DIV_MAX
 182     = BUILT_IN_COMPLEX_DIV_MIN
 183       + MAX_MODE_COMPLEX_FLOAT
 184       - MIN_MODE_COMPLEX_FLOAT,
 185
 186   /* Upper bound on non-language-specific builtins.  */
 187   END_BUILTINS
 188 };
 189 #undef DEF_BUILTIN
 190
 191 /* Tree code classes.  Each tree_code has an associated code class
 192    represented by a TREE_CODE_CLASS.  */
 193 enum tree_code_class {
 194   tcc_exceptional, /* An exceptional code (fits no category).  */
 195   tcc_constant,    /* A constant.  */
 196   /* Order of tcc_type and tcc_declaration is important.  */
 197   tcc_type,        /* A type object code.  */
 198   tcc_declaration, /* A declaration (also serving as variable refs).  */
 199   tcc_reference,   /* A reference to storage.  */
 200   tcc_comparison,  /* A comparison expression.  */
 201   tcc_unary,       /* A unary arithmetic expression.  */
 202   tcc_binary,      /* A binary arithmetic expression.  */
 203   tcc_statement,   /* A statement expression, which have side effects
 204                       but usually no interesting value.  */
 205   tcc_vl_exp,      /* A function call or other expression with a
 206                       variable-length operand vector.  */
 207   tcc_expression   /* Any other expression.  */
 208 };
 209
 210 /* OMP_CLAUSE codes.  Do not reorder, as this is used to index into
 211    the tables omp_clause_num_ops and omp_clause_code_name.  */
 212 enum omp_clause_code {
 213   /* Clause zero is special-cased inside the parser
 214      (c_parser_omp_variable_list).  */
 215   OMP_CLAUSE_ERROR = 0,
 216
 217   /* OpenACC/OpenMP clause: private (variable_list).  */
 218   OMP_CLAUSE_PRIVATE,
 219
 220   /* OpenMP clause: shared (variable_list).  */
 221   OMP_CLAUSE_SHARED,
 222
 223   /* OpenACC/OpenMP clause: firstprivate (variable_list).  */
 224   OMP_CLAUSE_FIRSTPRIVATE,
 225
 226   /* OpenMP clause: lastprivate (variable_list).  */
 227   OMP_CLAUSE_LASTPRIVATE,
 228
 229   /* OpenACC/OpenMP clause: reduction (operator:variable_list).
 230      OMP_CLAUSE_REDUCTION_CODE: The tree_code of the operator.
 231      Operand 1: OMP_CLAUSE_REDUCTION_INIT: Stmt-list to initialize the var.
 232      Operand 2: OMP_CLAUSE_REDUCTION_MERGE: Stmt-list to merge private var
 233                 into the shared one.
 234      Operand 3: OMP_CLAUSE_REDUCTION_PLACEHOLDER: A dummy VAR_DECL
 235                 placeholder used in OMP_CLAUSE_REDUCTION_{INIT,MERGE}.  */
 236   OMP_CLAUSE_REDUCTION,
 237
 238   /* OpenMP clause: copyin (variable_list).  */
 239   OMP_CLAUSE_COPYIN,
 240
 241   /* OpenMP clause: copyprivate (variable_list).  */
 242   OMP_CLAUSE_COPYPRIVATE,
 243
 244   /* OpenMP clause: linear (variable-list[:linear-step]).  */
 245   OMP_CLAUSE_LINEAR,
 246
 247   /* OpenMP clause: aligned (variable-list[:alignment]).  */
 248   OMP_CLAUSE_ALIGNED,
 249
 250   /* OpenMP clause: depend ({in,out,inout}:variable-list).  */
 251   OMP_CLAUSE_DEPEND,
 252
 253   /* OpenMP clause: uniform (argument-list).  */
 254   OMP_CLAUSE_UNIFORM,
 255
 256   /* OpenMP clause: from (variable-list).  */
 257   OMP_CLAUSE_FROM,
 258
 259   /* OpenMP clause: to (variable-list).  */
 260   OMP_CLAUSE_TO,
 261
 262   /* OpenACC clauses: {copy, copyin, copyout, create, delete, deviceptr,
 263      device, host (self), present, present_or_copy (pcopy), present_or_copyin
 264      (pcopyin), present_or_copyout (pcopyout), present_or_create (pcreate)}
 265      (variable-list).
 266
 267      OpenMP clause: map ({alloc:,to:,from:,tofrom:,}variable-list).  */
 268   OMP_CLAUSE_MAP,
 269
 270   /* Internal structure to hold OpenACC cache directive's variable-list.
 271      #pragma acc cache (variable-list).  */
 272   OMP_CLAUSE__CACHE_,
 273
 274   /* OpenACC clause: device_resident (variable_list).  */
 275   OMP_CLAUSE_DEVICE_RESIDENT,
 276
 277   /* OpenACC clause: use_device (variable_list).  */
 278   OMP_CLAUSE_USE_DEVICE,
 279
 280   /* OpenACC clause: gang [(gang-argument-list)].
 281      Where
 282       gang-argument-list: [gang-argument-list, ] gang-argument
 283       gang-argument: [num:] integer-expression
 284                    | static: size-expression
 285       size-expression: * | integer-expression.  */
 286   OMP_CLAUSE_GANG,
 287
 288   /* OpenACC clause: async [(integer-expression)].  */
 289   OMP_CLAUSE_ASYNC,
 290
 291   /* OpenACC clause: wait [(integer-expression-list)].  */
 292   OMP_CLAUSE_WAIT,
 293
 294   /* OpenACC clause: auto.  */
 295   OMP_CLAUSE_AUTO,
 296
 297   /* OpenACC clause: seq.  */
 298   OMP_CLAUSE_SEQ,
 299
 300   /* Internal clause: temporary for combined loops expansion.  */
 301   OMP_CLAUSE__LOOPTEMP_,
 302
 303   /* OpenACC/OpenMP clause: if (scalar-expression).  */
 304   OMP_CLAUSE_IF,
 305
 306   /* OpenMP clause: num_threads (integer-expression).  */
 307   OMP_CLAUSE_NUM_THREADS,
 308
 309   /* OpenMP clause: schedule.  */
 310   OMP_CLAUSE_SCHEDULE,
 311
 312   /* OpenMP clause: nowait.  */
 313   OMP_CLAUSE_NOWAIT,
 314
 315   /* OpenMP clause: ordered.  */
 316   OMP_CLAUSE_ORDERED,
 317
 318   /* OpenMP clause: default.  */
 319   OMP_CLAUSE_DEFAULT,
 320
 321   /* OpenACC/OpenMP clause: collapse (constant-integer-expression).  */
 322   OMP_CLAUSE_COLLAPSE,
 323
 324   /* OpenMP clause: untied.  */
 325   OMP_CLAUSE_UNTIED,
 326
 327   /* OpenMP clause: final (scalar-expression).  */
 328   OMP_CLAUSE_FINAL,
 329
 330   /* OpenMP clause: mergeable.  */
 331   OMP_CLAUSE_MERGEABLE,
 332
 333   /* OpenMP clause: device (integer-expression).  */
 334   OMP_CLAUSE_DEVICE,
 335
 336   /* OpenMP clause: dist_schedule (static[:chunk-size]).  */
 337   OMP_CLAUSE_DIST_SCHEDULE,
 338
 339   /* OpenMP clause: inbranch.  */
 340   OMP_CLAUSE_INBRANCH,
 341
 342   /* OpenMP clause: notinbranch.  */
 343   OMP_CLAUSE_NOTINBRANCH,
 344
 345   /* OpenMP clause: num_teams(integer-expression).  */
 346   OMP_CLAUSE_NUM_TEAMS,
 347
 348   /* OpenMP clause: thread_limit(integer-expression).  */
 349   OMP_CLAUSE_THREAD_LIMIT,
 350
 351   /* OpenMP clause: proc_bind ({master,close,spread}).  */
 352   OMP_CLAUSE_PROC_BIND,
 353
 354   /* OpenMP clause: safelen (constant-integer-expression).  */
 355   OMP_CLAUSE_SAFELEN,
 356
 357   /* OpenMP clause: simdlen (constant-integer-expression).  */
 358   OMP_CLAUSE_SIMDLEN,
 359
 360   /* OpenMP clause: for.  */
 361   OMP_CLAUSE_FOR,
 362
 363   /* OpenMP clause: parallel.  */
 364   OMP_CLAUSE_PARALLEL,
 365
 366   /* OpenMP clause: sections.  */
 367   OMP_CLAUSE_SECTIONS,
 368
 369   /* OpenMP clause: taskgroup.  */
 370   OMP_CLAUSE_TASKGROUP,
 371
 372   /* Internally used only clause, holding SIMD uid.  */
 373   OMP_CLAUSE__SIMDUID_,
 374
 375   /* Internally used only clause, holding _Cilk_for # of iterations
 376      on OMP_PARALLEL.  */
 377   OMP_CLAUSE__CILK_FOR_COUNT_,
 378
 379   /* OpenACC clause: independent.  */
 380   OMP_CLAUSE_INDEPENDENT,
 381
 382   /* OpenACC clause: worker [( [num:] integer-expression)].  */
 383   OMP_CLAUSE_WORKER,
 384
 385   /* OpenACC clause: vector [( [length:] integer-expression)].  */
 386   OMP_CLAUSE_VECTOR,
 387
 388   /* OpenACC clause: num_gangs (integer-expression).  */
 389   OMP_CLAUSE_NUM_GANGS,
 390
 391   /* OpenACC clause: num_workers (integer-expression).  */
 392   OMP_CLAUSE_NUM_WORKERS,
 393
 394   /* OpenACC clause: vector_length (integer-expression).  */
 395   OMP_CLAUSE_VECTOR_LENGTH
 396 };
 397
 398 #undef DEFTREESTRUCT
 399 #define DEFTREESTRUCT(ENUM, NAME) ENUM,
 400 enum tree_node_structure_enum {
 401 #include "treestruct.def"
 402   LAST_TS_ENUM
 403 };
 404 #undef DEFTREESTRUCT
 405
 406 enum omp_clause_schedule_kind {
 407   OMP_CLAUSE_SCHEDULE_STATIC,
 408   OMP_CLAUSE_SCHEDULE_DYNAMIC,
 409   OMP_CLAUSE_SCHEDULE_GUIDED,
 410   OMP_CLAUSE_SCHEDULE_AUTO,
 411   OMP_CLAUSE_SCHEDULE_RUNTIME,
 412   OMP_CLAUSE_SCHEDULE_CILKFOR,
 413   OMP_CLAUSE_SCHEDULE_LAST
 414 };
 415
 416 enum omp_clause_default_kind {
 417   OMP_CLAUSE_DEFAULT_UNSPECIFIED,
 418   OMP_CLAUSE_DEFAULT_SHARED,
 419   OMP_CLAUSE_DEFAULT_NONE,
 420   OMP_CLAUSE_DEFAULT_PRIVATE,
 421   OMP_CLAUSE_DEFAULT_FIRSTPRIVATE,
 422   OMP_CLAUSE_DEFAULT_LAST
 423 };
 424
 425 /* There is a TYPE_QUAL value for each type qualifier.  They can be
 426    combined by bitwise-or to form the complete set of qualifiers for a
 427    type.  */
 428 enum cv_qualifier {
 429   TYPE_UNQUALIFIED   = 0x0,
 430   TYPE_QUAL_CONST    = 0x1,
 431   TYPE_QUAL_VOLATILE = 0x2,
 432   TYPE_QUAL_RESTRICT = 0x4,
 433   TYPE_QUAL_ATOMIC   = 0x8
 434 };
 435
 436 /* Enumerate visibility settings.  */
 437 #ifndef SYMBOL_VISIBILITY_DEFINED
 438 #define SYMBOL_VISIBILITY_DEFINED
 439 enum symbol_visibility {
 440   VISIBILITY_DEFAULT,
 441   VISIBILITY_PROTECTED,
 442   VISIBILITY_HIDDEN,
 443   VISIBILITY_INTERNAL
 444 };
 445 #endif  // SYMBOL_VISIBILITY_DEFINED
 446
 447 /* Standard named or nameless data types of the C compiler.  */
 448 enum tree_index {
 449   TI_ERROR_MARK,
 450   TI_INTQI_TYPE,
 451   TI_INTHI_TYPE,
 452   TI_INTSI_TYPE,
 453   TI_INTDI_TYPE,
 454   TI_INTTI_TYPE,
 455
 456   TI_UINTQI_TYPE,
 457   TI_UINTHI_TYPE,
 458   TI_UINTSI_TYPE,
 459   TI_UINTDI_TYPE,
 460   TI_UINTTI_TYPE,
 461
 462   TI_ATOMICQI_TYPE,
 463   TI_ATOMICHI_TYPE,
 464   TI_ATOMICSI_TYPE,
 465   TI_ATOMICDI_TYPE,
 466   TI_ATOMICTI_TYPE,
 467
 468   TI_UINT16_TYPE,
 469   TI_UINT32_TYPE,
 470   TI_UINT64_TYPE,
 471
 472   TI_VOID,
 473
 474   TI_INTEGER_ZERO,
 475   TI_INTEGER_ONE,
 476   TI_INTEGER_THREE,
 477   TI_INTEGER_MINUS_ONE,
 478   TI_NULL_POINTER,
 479
 480   TI_SIZE_ZERO,
 481   TI_SIZE_ONE,
 482
 483   TI_BITSIZE_ZERO,
 484   TI_BITSIZE_ONE,
 485   TI_BITSIZE_UNIT,
 486
 487   TI_PUBLIC,
 488   TI_PROTECTED,
 489   TI_PRIVATE,
 490
 491   TI_BOOLEAN_FALSE,
 492   TI_BOOLEAN_TRUE,
 493
 494   TI_COMPLEX_INTEGER_TYPE,
 495   TI_COMPLEX_FLOAT_TYPE,
 496   TI_COMPLEX_DOUBLE_TYPE,
 497   TI_COMPLEX_LONG_DOUBLE_TYPE,
 498
 499   TI_FLOAT_TYPE,
 500   TI_DOUBLE_TYPE,
 501   TI_LONG_DOUBLE_TYPE,
 502
 503   TI_FLOAT_PTR_TYPE,
 504   TI_DOUBLE_PTR_TYPE,
 505   TI_LONG_DOUBLE_PTR_TYPE,
 506   TI_INTEGER_PTR_TYPE,
 507
 508   TI_VOID_TYPE,
 509   TI_PTR_TYPE,
 510   TI_CONST_PTR_TYPE,
 511   TI_SIZE_TYPE,
 512   TI_PID_TYPE,
 513   TI_PTRDIFF_TYPE,
 514   TI_VA_LIST_TYPE,
 515   TI_VA_LIST_GPR_COUNTER_FIELD,
 516   TI_VA_LIST_FPR_COUNTER_FIELD,
 517   TI_BOOLEAN_TYPE,
 518   TI_FILEPTR_TYPE,
 519   TI_POINTER_SIZED_TYPE,
 520
 521   TI_POINTER_BOUNDS_TYPE,
 522
 523   TI_DFLOAT32_TYPE,
 524   TI_DFLOAT64_TYPE,
 525   TI_DFLOAT128_TYPE,
 526   TI_DFLOAT32_PTR_TYPE,
 527   TI_DFLOAT64_PTR_TYPE,
 528   TI_DFLOAT128_PTR_TYPE,
 529
 530   TI_VOID_LIST_NODE,
 531
 532   TI_MAIN_IDENTIFIER,
 533
 534   TI_SAT_SFRACT_TYPE,
 535   TI_SAT_FRACT_TYPE,
 536   TI_SAT_LFRACT_TYPE,
 537   TI_SAT_LLFRACT_TYPE,
 538   TI_SAT_USFRACT_TYPE,
 539   TI_SAT_UFRACT_TYPE,
 540   TI_SAT_ULFRACT_TYPE,
 541   TI_SAT_ULLFRACT_TYPE,
 542   TI_SFRACT_TYPE,
 543   TI_FRACT_TYPE,
 544   TI_LFRACT_TYPE,
 545   TI_LLFRACT_TYPE,
 546   TI_USFRACT_TYPE,
 547   TI_UFRACT_TYPE,
 548   TI_ULFRACT_TYPE,
 549   TI_ULLFRACT_TYPE,
 550   TI_SAT_SACCUM_TYPE,
 551   TI_SAT_ACCUM_TYPE,
 552   TI_SAT_LACCUM_TYPE,
 553   TI_SAT_LLACCUM_TYPE,
 554   TI_SAT_USACCUM_TYPE,
 555   TI_SAT_UACCUM_TYPE,
 556   TI_SAT_ULACCUM_TYPE,
 557   TI_SAT_ULLACCUM_TYPE,
 558   TI_SACCUM_TYPE,
 559   TI_ACCUM_TYPE,
 560   TI_LACCUM_TYPE,
 561   TI_LLACCUM_TYPE,
 562   TI_USACCUM_TYPE,
 563   TI_UACCUM_TYPE,
 564   TI_ULACCUM_TYPE,
 565   TI_ULLACCUM_TYPE,
 566   TI_QQ_TYPE,
 567   TI_HQ_TYPE,
 568   TI_SQ_TYPE,
 569   TI_DQ_TYPE,
 570   TI_TQ_TYPE,
 571   TI_UQQ_TYPE,
 572   TI_UHQ_TYPE,
 573   TI_USQ_TYPE,
 574   TI_UDQ_TYPE,
 575   TI_UTQ_TYPE,
 576   TI_SAT_QQ_TYPE,
 577   TI_SAT_HQ_TYPE,
 578   TI_SAT_SQ_TYPE,
 579   TI_SAT_DQ_TYPE,
 580   TI_SAT_TQ_TYPE,
 581   TI_SAT_UQQ_TYPE,
 582   TI_SAT_UHQ_TYPE,
 583   TI_SAT_USQ_TYPE,
 584   TI_SAT_UDQ_TYPE,
 585   TI_SAT_UTQ_TYPE,
 586   TI_HA_TYPE,
 587   TI_SA_TYPE,
 588   TI_DA_TYPE,
 589   TI_TA_TYPE,
 590   TI_UHA_TYPE,
 591   TI_USA_TYPE,
 592   TI_UDA_TYPE,
 593   TI_UTA_TYPE,
 594   TI_SAT_HA_TYPE,
 595   TI_SAT_SA_TYPE,
 596   TI_SAT_DA_TYPE,
 597   TI_SAT_TA_TYPE,
 598   TI_SAT_UHA_TYPE,
 599   TI_SAT_USA_TYPE,
 600   TI_SAT_UDA_TYPE,
 601   TI_SAT_UTA_TYPE,
 602
 603   TI_OPTIMIZATION_DEFAULT,
 604   TI_OPTIMIZATION_CURRENT,
 605   TI_TARGET_OPTION_DEFAULT,
 606   TI_TARGET_OPTION_CURRENT,
 607   TI_CURRENT_TARGET_PRAGMA,
 608   TI_CURRENT_OPTIMIZE_PRAGMA,
 609
 610   TI_MAX
 611 };
 612
 613 /* An enumeration of the standard C integer types.  These must be
 614    ordered so that shorter types appear before longer ones, and so
 615    that signed types appear before unsigned ones, for the correct
 616    functioning of interpret_integer() in c-lex.c.  */
 617 enum integer_type_kind {
 618   itk_char,
 619   itk_signed_char,
 620   itk_unsigned_char,
 621   itk_short,
 622   itk_unsigned_short,
 623   itk_int,
 624   itk_unsigned_int,
 625   itk_long,
 626   itk_unsigned_long,
 627   itk_long_long,
 628   itk_unsigned_long_long,
 629
 630   itk_intN_0,
 631   itk_unsigned_intN_0,
 632   itk_intN_1,
 633   itk_unsigned_intN_1,
 634   itk_intN_2,
 635   itk_unsigned_intN_2,
 636   itk_intN_3,
 637   itk_unsigned_intN_3,
 638
 639   itk_none
 640 };
 641
 642 /* A pointer-to-function member type looks like:
 643
 644      struct {
 645        __P __pfn;
 646        ptrdiff_t __delta;
 647      };
 648
 649    If __pfn is NULL, it is a NULL pointer-to-member-function.
 650
 651    (Because the vtable is always the first thing in the object, we
 652    don't need its offset.)  If the function is virtual, then PFN is
 653    one plus twice the index into the vtable; otherwise, it is just a
 654    pointer to the function.
 655
 656    Unfortunately, using the lowest bit of PFN doesn't work in
 657    architectures that don't impose alignment requirements on function
 658    addresses, or that use the lowest bit to tell one ISA from another,
 659    for example.  For such architectures, we use the lowest bit of
 660    DELTA instead of the lowest bit of the PFN, and DELTA will be
 661    multiplied by 2.  */
 662 enum ptrmemfunc_vbit_where_t {
 663   ptrmemfunc_vbit_in_pfn,
 664   ptrmemfunc_vbit_in_delta
 665 };
 666
 667 /* Flags that may be passed in the third argument of decl_attributes, and
 668    to handler functions for attributes.  */
 669 enum attribute_flags {
 670   /* The type passed in is the type of a DECL, and any attributes that
 671      should be passed in again to be applied to the DECL rather than the
 672      type should be returned.  */
 673   ATTR_FLAG_DECL_NEXT = 1,
 674   /* The type passed in is a function return type, and any attributes that
 675      should be passed in again to be applied to the function type rather
 676      than the return type should be returned.  */
 677   ATTR_FLAG_FUNCTION_NEXT = 2,
 678   /* The type passed in is an array element type, and any attributes that
 679      should be passed in again to be applied to the array type rather
 680      than the element type should be returned.  */
 681   ATTR_FLAG_ARRAY_NEXT = 4,
 682   /* The type passed in is a structure, union or enumeration type being
 683      created, and should be modified in place.  */
 684   ATTR_FLAG_TYPE_IN_PLACE = 8,
 685   /* The attributes are being applied by default to a library function whose
 686      name indicates known behavior, and should be silently ignored if they
 687      are not in fact compatible with the function type.  */
 688   ATTR_FLAG_BUILT_IN = 16,
 689   /* A given attribute has been parsed as a C++-11 attribute.  */
 690   ATTR_FLAG_CXX11 = 32
 691 };
 692
 693 /* Types used to represent sizes.  */
 694 enum size_type_kind {
 695   stk_sizetype,         /* Normal representation of sizes in bytes.  */
 696   stk_ssizetype,        /* Signed representation of sizes in bytes.  */
 697   stk_bitsizetype,      /* Normal representation of sizes in bits.  */
 698   stk_sbitsizetype,     /* Signed representation of sizes in bits.  */
 699   stk_type_kind_last
 700 };
 701
 702 enum operand_equal_flag {
 703   OEP_ONLY_CONST = 1,
 704   OEP_PURE_SAME = 2,
 705   OEP_CONSTANT_ADDRESS_OF = 4,
 706   OEP_ADDRESS_OF = 8
 707 };
 708
 709 /* Enum and arrays used for tree allocation stats.
 710    Keep in sync with tree.c:tree_node_kind_names.  */
 711 enum tree_node_kind {
 712   d_kind,
 713   t_kind,
 714   b_kind,
 715   s_kind,
 716   r_kind,
 717   e_kind,
 718   c_kind,
 719   id_kind,
 720   vec_kind,
 721   binfo_kind,
 722   ssa_name_kind,
 723   constr_kind,
 724   x_kind,
 725   lang_decl,
 726   lang_type,
 727   omp_clause_kind,
 728   all_kinds
 729 };
 730
 731 enum annot_expr_kind {
 732   annot_expr_ivdep_kind,
 733   annot_expr_no_vector_kind,
 734   annot_expr_vector_kind,
 735   annot_expr_kind_last
 736 };
 737
 738 /* Internal functions.  */
 739 enum internal_fn {
 740 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) IFN_##CODE,
 741 #include "internal-fn.def"
 742 #undef DEF_INTERNAL_FN
 743   IFN_LAST
 744 };
 745
 746 /*---------------------------------------------------------------------------
 747                                 Type definitions
 748 ---------------------------------------------------------------------------*/
 749 /* When processing aliases at the symbol table level, we need the
 750    declaration of target. For this reason we need to queue aliases and
 751    process them after all declarations has been produced.  */
 752 struct GTY(()) alias_pair {
 753   tree decl;
 754   tree target;
 755 };
 756
 757 /* An initialization priority.  */
 758 typedef unsigned short priority_type;
 759
 760 /* The type of a callback function for walking over tree structure.  */
 761 typedef tree (*walk_tree_fn) (tree *, int *, void *);
 762
 763 /* The type of a callback function that represents a custom walk_tree.  */
 764 typedef tree (*walk_tree_lh) (tree *, int *, tree (*) (tree *, int *, void *),
 765                               void *, hash_set<tree> *);
 766
 767
 768 /*---------------------------------------------------------------------------
 769                               Main data structures
 770 ---------------------------------------------------------------------------*/
 771 /* A tree node can represent a data type, a variable, an expression
 772    or a statement.  Each node has a TREE_CODE which says what kind of
 773    thing it represents.  Some common codes are:
 774    INTEGER_TYPE -- represents a type of integers.
 775    ARRAY_TYPE -- represents a type of pointer.
 776    VAR_DECL -- represents a declared variable.
 777    INTEGER_CST -- represents a constant integer value.
 778    PLUS_EXPR -- represents a sum (an expression).
 779
 780    As for the contents of a tree node: there are some fields
 781    that all nodes share.  Each TREE_CODE has various special-purpose
 782    fields as well.  The fields of a node are never accessed directly,
 783    always through accessor macros.  */
 784
 785 /* Every kind of tree node starts with this structure,
 786    so all nodes have these fields.
 787
 788    See the accessor macros, defined below, for documentation of the
 789    fields, and the table below which connects the fields and the
 790    accessor macros.  */
 791
 792 struct GTY(()) tree_base {
 793   ENUM_BITFIELD(tree_code) code : 16;
 794
 795   unsigned side_effects_flag : 1;
 796   unsigned constant_flag : 1;
 797   unsigned addressable_flag : 1;
 798   unsigned volatile_flag : 1;
 799   unsigned readonly_flag : 1;
 800   unsigned asm_written_flag: 1;
 801   unsigned nowarning_flag : 1;
 802   unsigned visited : 1;
 803
 804   unsigned used_flag : 1;
 805   unsigned nothrow_flag : 1;
 806   unsigned static_flag : 1;
 807   unsigned public_flag : 1;
 808   unsigned private_flag : 1;
 809   unsigned protected_flag : 1;
 810   unsigned deprecated_flag : 1;
 811   unsigned default_def_flag : 1;
 812
 813   union {
 814     /* The bits in the following structure should only be used with
 815        accessor macros that constrain inputs with tree checking.  */
 816     struct {
 817       unsigned lang_flag_0 : 1;
 818       unsigned lang_flag_1 : 1;
 819       unsigned lang_flag_2 : 1;
 820       unsigned lang_flag_3 : 1;
 821       unsigned lang_flag_4 : 1;
 822       unsigned lang_flag_5 : 1;
 823       unsigned lang_flag_6 : 1;
 824       unsigned saturating_flag : 1;
 825
 826       unsigned unsigned_flag : 1;
 827       unsigned packed_flag : 1;
 828       unsigned user_align : 1;
 829       unsigned nameless_flag : 1;
 830       unsigned atomic_flag : 1;
 831       unsigned spare0 : 3;
 832
 833       unsigned spare1 : 8;
 834
 835       /* This field is only used with TREE_TYPE nodes; the only reason it is
 836          present in tree_base instead of tree_type is to save space.  The size
 837          of the field must be large enough to hold addr_space_t values.  */
 838       unsigned address_space : 8;
 839     } bits;
 840
 841     /* The following fields are present in tree_base to save space.  The
 842        nodes using them do not require any of the flags above and so can
 843        make better use of the 4-byte sized word.  */
 844
 845     /* The number of HOST_WIDE_INTs in an INTEGER_CST.  */
 846     struct {
 847       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
 848          its native precision.  */
 849       unsigned char unextended;
 850
 851       /* The number of HOST_WIDE_INTs if the INTEGER_CST is extended to
 852          wider precisions based on its TYPE_SIGN.  */
 853       unsigned char extended;
 854
 855       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
 856          offset_int precision, with smaller integers being extended
 857          according to their TYPE_SIGN.  This is equal to one of the two
 858          fields above but is cached for speed.  */
 859       unsigned char offset;
 860     } int_length;
 861
 862     /* VEC length.  This field is only used with TREE_VEC.  */
 863     int length;
 864
 865     /* SSA version number.  This field is only used with SSA_NAME.  */
 866     unsigned int version;
 867
 868     /* Internal function code.  */
 869     enum internal_fn ifn;
 870
 871     /* The following two fields are used for MEM_REF and TARGET_MEM_REF
 872        expression trees and specify known data non-dependences.  For
 873        two memory references in a function they are known to not
 874        alias if dependence_info.clique are equal and dependence_info.base
 875        are distinct.  */
 876     struct {
 877       unsigned short clique;
 878       unsigned short base;
 879     } dependence_info;
 880   } GTY((skip(""))) u;
 881 };
 882
 883 /* The following table lists the uses of each of the above flags and
 884    for which types of nodes they are defined.
 885
 886    addressable_flag:
 887
 888        TREE_ADDRESSABLE in
 889            VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
 890            SSA_NAME
 891            all types
 892            CONSTRUCTOR, IDENTIFIER_NODE
 893            STMT_EXPR
 894
 895        CALL_EXPR_TAILCALL in
 896            CALL_EXPR
 897
 898        CASE_LOW_SEEN in
 899            CASE_LABEL_EXPR
 900
 901        PREDICT_EXPR_OUTCOME in
 902            PREDICT_EXPR
 903
 904    static_flag:
 905
 906        TREE_STATIC in
 907            VAR_DECL, FUNCTION_DECL
 908            CONSTRUCTOR
 909
 910        TREE_NO_TRAMPOLINE in
 911            ADDR_EXPR
 912
 913        BINFO_VIRTUAL_P in
 914            TREE_BINFO
 915
 916        TREE_SYMBOL_REFERENCED in
 917            IDENTIFIER_NODE
 918
 919        CLEANUP_EH_ONLY in
 920            TARGET_EXPR, WITH_CLEANUP_EXPR
 921
 922        TRY_CATCH_IS_CLEANUP in
 923            TRY_CATCH_EXPR
 924
 925        ASM_INPUT_P in
 926            ASM_EXPR
 927
 928        TYPE_REF_CAN_ALIAS_ALL in
 929            POINTER_TYPE, REFERENCE_TYPE
 930
 931        CASE_HIGH_SEEN in
 932            CASE_LABEL_EXPR
 933
 934        ENUM_IS_SCOPED in
 935            ENUMERAL_TYPE
 936
 937        TRANSACTION_EXPR_OUTER in
 938            TRANSACTION_EXPR
 939
 940        SSA_NAME_ANTI_RANGE_P in
 941            SSA_NAME
 942
 943    public_flag:
 944
 945        TREE_OVERFLOW in
 946            INTEGER_CST, REAL_CST, COMPLEX_CST, VECTOR_CST
 947
 948        TREE_PUBLIC in
 949            VAR_DECL, FUNCTION_DECL
 950            IDENTIFIER_NODE
 951
 952        CONSTRUCTOR_NO_CLEARING in
 953            CONSTRUCTOR
 954
 955        ASM_VOLATILE_P in
 956            ASM_EXPR
 957
 958        CALL_EXPR_VA_ARG_PACK in
 959            CALL_EXPR
 960
 961        TYPE_CACHED_VALUES_P in
 962            all types
 963
 964        SAVE_EXPR_RESOLVED_P in
 965            SAVE_EXPR
 966
 967        OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE in
 968            OMP_CLAUSE_LASTPRIVATE
 969
 970        OMP_CLAUSE_PRIVATE_DEBUG in
 971            OMP_CLAUSE_PRIVATE
 972
 973        OMP_CLAUSE_LINEAR_NO_COPYIN in
 974            OMP_CLAUSE_LINEAR
 975
 976        OMP_CLAUSE_MAP_ZERO_BIAS_ARRAY_SECTION in
 977            OMP_CLAUSE_MAP
 978
 979        OMP_CLAUSE_REDUCTION_OMP_ORIG_REF in
 980            OMP_CLAUSE_REDUCTION
 981
 982        TRANSACTION_EXPR_RELAXED in
 983            TRANSACTION_EXPR
 984
 985    private_flag:
 986
 987        TREE_PRIVATE in
 988            all decls
 989
 990        CALL_EXPR_RETURN_SLOT_OPT in
 991            CALL_EXPR
 992
 993        OMP_SECTION_LAST in
 994            OMP_SECTION
 995
 996        OMP_PARALLEL_COMBINED in
 997            OMP_PARALLEL
 998
 999        OMP_ATOMIC_SEQ_CST in
1000            OMP_ATOMIC*
1001
1002        OMP_CLAUSE_PRIVATE_OUTER_REF in
1003            OMP_CLAUSE_PRIVATE
1004
1005        OMP_CLAUSE_LINEAR_NO_COPYOUT in
1006            OMP_CLAUSE_LINEAR
1007
1008        TYPE_REF_IS_RVALUE in
1009            REFERENCE_TYPE
1010
1011        ENUM_IS_OPAQUE in
1012            ENUMERAL_TYPE
1013
1014    protected_flag:
1015
1016        TREE_PROTECTED in
1017            BLOCK
1018            all decls
1019
1020        CALL_FROM_THUNK_P and
1021        CALL_ALLOCA_FOR_VAR_P in
1022            CALL_EXPR
1023
1024        OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
1025            OMP_CLAUSE_LINEAR
1026
1027    side_effects_flag:
1028
1029        TREE_SIDE_EFFECTS in
1030            all expressions
1031            all decls
1032            all constants
1033
1034        FORCED_LABEL in
1035            LABEL_DECL
1036
1037    volatile_flag:
1038
1039        TREE_THIS_VOLATILE in
1040            all expressions
1041            all decls
1042
1043        TYPE_VOLATILE in
1044            all types
1045
1046    readonly_flag:
1047
1048        TREE_READONLY in
1049            all expressions
1050            all decls
1051
1052        TYPE_READONLY in
1053            all types
1054
1055    constant_flag:
1056
1057        TREE_CONSTANT in
1058            all expressions
1059            all decls
1060            all constants
1061
1062        TYPE_SIZES_GIMPLIFIED in
1063            all types
1064
1065    unsigned_flag:
1066
1067        TYPE_UNSIGNED in
1068            all types
1069
1070        DECL_UNSIGNED in
1071            all decls
1072
1073    asm_written_flag:
1074
1075        TREE_ASM_WRITTEN in
1076            VAR_DECL, FUNCTION_DECL, TYPE_DECL
1077            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE
1078            BLOCK, STRING_CST
1079
1080        SSA_NAME_OCCURS_IN_ABNORMAL_PHI in
1081            SSA_NAME
1082
1083    used_flag:
1084
1085        TREE_USED in
1086            all expressions
1087            all decls
1088            IDENTIFIER_NODE
1089
1090    nothrow_flag:
1091
1092        TREE_NOTHROW in
1093            CALL_EXPR
1094            FUNCTION_DECL
1095
1096        TYPE_ALIGN_OK in
1097            all types
1098
1099        TREE_THIS_NOTRAP in
1100           INDIRECT_REF, MEM_REF, TARGET_MEM_REF, ARRAY_REF, ARRAY_RANGE_REF
1101
1102        SSA_NAME_IN_FREELIST in
1103           SSA_NAME
1104
1105        DECL_NONALIASED in
1106           VAR_DECL
1107
1108    deprecated_flag:
1109
1110        TREE_DEPRECATED in
1111            all decls
1112            all types
1113
1114        IDENTIFIER_TRANSPARENT_ALIAS in
1115            IDENTIFIER_NODE
1116
1117    visited:
1118
1119        TREE_VISITED in
1120            all trees (used liberally by many passes)
1121
1122    saturating_flag:
1123
1124        TYPE_SATURATING in
1125            all types
1126
1127        VAR_DECL_IS_VIRTUAL_OPERAND in
1128            VAR_DECL
1129
1130    nowarning_flag:
1131
1132        TREE_NO_WARNING in
1133            all expressions
1134            all decls
1135
1136        TYPE_ARTIFICIAL in
1137            all types
1138
1139    default_def_flag:
1140
1141        TYPE_VECTOR_OPAQUE in
1142            VECTOR_TYPE
1143
1144        SSA_NAME_IS_DEFAULT_DEF in
1145            SSA_NAME
1146
1147        DECL_NONLOCAL_FRAME in
1148            VAR_DECL
1149
1150        TYPE_FINAL_P in
1151            RECORD_TYPE, UNION_TYPE and QUAL_UNION_TYPE
1152 */
1153
1154 struct GTY(()) tree_typed {
1155   struct tree_base base;
1156   tree type;
1157 };
1158
1159 struct GTY(()) tree_common {
1160   struct tree_typed typed;
1161   tree chain;
1162 };
1163
1164 struct GTY(()) tree_int_cst {
1165   struct tree_typed typed;
1166   HOST_WIDE_INT val[1];
1167 };
1168
1169
1170 struct GTY(()) tree_real_cst {
1171   struct tree_typed typed;
1172   struct real_value * real_cst_ptr;
1173 };
1174
1175 struct GTY(()) tree_fixed_cst {
1176   struct tree_typed typed;
1177   struct fixed_value * fixed_cst_ptr;
1178 };
1179
1180 struct GTY(()) tree_string {
1181   struct tree_typed typed;
1182   int length;
1183   char str[1];
1184 };
1185
1186 struct GTY(()) tree_complex {
1187   struct tree_typed typed;
1188   tree real;
1189   tree imag;
1190 };
1191
1192 struct GTY(()) tree_vector {
1193   struct tree_typed typed;
1194   tree GTY ((length ("TYPE_VECTOR_SUBPARTS (TREE_TYPE ((tree)&%h))"))) elts[1];
1195 };
1196
1197 struct GTY(()) tree_identifier {
1198   struct tree_common common;
1199   struct ht_identifier id;
1200 };
1201
1202 struct GTY(()) tree_list {
1203   struct tree_common common;
1204   tree purpose;
1205   tree value;
1206 };
1207
1208 struct GTY(()) tree_vec {
1209   struct tree_common common;
1210   tree GTY ((length ("TREE_VEC_LENGTH ((tree)&%h)"))) a[1];
1211 };
1212
1213 /* A single element of a CONSTRUCTOR. VALUE holds the actual value of the
1214    element. INDEX can optionally design the position of VALUE: in arrays,
1215    it is the index where VALUE has to be placed; in structures, it is the
1216    FIELD_DECL of the member.  */
1217 struct GTY(()) constructor_elt {
1218   tree index;
1219   tree value;
1220 };
1221
1222 struct GTY(()) tree_constructor {
1223   struct tree_typed typed;
1224   vec<constructor_elt, va_gc> *elts;
1225 };
1226
1227 enum omp_clause_depend_kind
1228 {
1229   OMP_CLAUSE_DEPEND_IN,
1230   OMP_CLAUSE_DEPEND_OUT,
1231   OMP_CLAUSE_DEPEND_INOUT,
1232   OMP_CLAUSE_DEPEND_LAST
1233 };
1234
1235 enum omp_clause_proc_bind_kind
1236 {
1237   /* Numbers should match omp_proc_bind_t enum in omp.h.  */
1238   OMP_CLAUSE_PROC_BIND_FALSE = 0,
1239   OMP_CLAUSE_PROC_BIND_TRUE = 1,
1240   OMP_CLAUSE_PROC_BIND_MASTER = 2,
1241   OMP_CLAUSE_PROC_BIND_CLOSE = 3,
1242   OMP_CLAUSE_PROC_BIND_SPREAD = 4,
1243   OMP_CLAUSE_PROC_BIND_LAST
1244 };
1245
1246 struct GTY(()) tree_exp {
1247   struct tree_typed typed;
1248   location_t locus;
1249   tree GTY ((special ("tree_exp"),
1250              desc ("TREE_CODE ((tree) &%0)")))
1251     operands[1];
1252 };
1253
1254 /* Immediate use linking structure.  This structure is used for maintaining
1255    a doubly linked list of uses of an SSA_NAME.  */
1256 struct GTY(()) ssa_use_operand_t {
1257   struct ssa_use_operand_t* GTY((skip(""))) prev;
1258   struct ssa_use_operand_t* GTY((skip(""))) next;
1259   /* Immediate uses for a given SSA name are maintained as a cyclic
1260      list.  To recognize the root of this list, the location field
1261      needs to point to the original SSA name.  Since statements and
1262      SSA names are of different data types, we need this union.  See
1263      the explanation in struct imm_use_iterator.  */
1264   union { gimple stmt; tree ssa_name; } GTY((skip(""))) loc;
1265   tree *GTY((skip(""))) use;
1266 };
1267
1268 struct GTY(()) tree_ssa_name {
1269   struct tree_typed typed;
1270
1271   /* _DECL wrapped by this SSA name.  */
1272   tree var;
1273
1274   /* Statement that defines this SSA name.  */
1275   gimple def_stmt;
1276
1277   /* Value range information.  */
1278   union ssa_name_info_type {
1279     /* Pointer attributes used for alias analysis.  */
1280     struct GTY ((tag ("0"))) ptr_info_def *ptr_info;
1281     /* Value range attributes used for zero/sign extension elimination.  */
1282     struct GTY ((tag ("1"))) range_info_def *range_info;
1283   } GTY ((desc ("%1.typed.type ?" \
1284                 "!POINTER_TYPE_P (TREE_TYPE ((tree)&%1)) : 2"))) info;
1285
1286   /* Immediate uses list for this SSA_NAME.  */
1287   struct ssa_use_operand_t imm_uses;
1288 };
1289
1290 struct GTY(()) phi_arg_d {
1291   /* imm_use MUST be the first element in struct because we do some
1292      pointer arithmetic with it.  See phi_arg_index_from_use.  */
1293   struct ssa_use_operand_t imm_use;
1294   tree def;
1295   location_t locus;
1296 };
1297
1298 struct GTY(()) tree_omp_clause {
1299   struct tree_common common;
1300   location_t locus;
1301   enum omp_clause_code code;
1302   union omp_clause_subcode {
1303     enum omp_clause_default_kind   default_kind;
1304     enum omp_clause_schedule_kind  schedule_kind;
1305     enum omp_clause_depend_kind    depend_kind;
1306     /* See include/gomp-constants.h for enum gomp_map_kind's values.  */
1307     unsigned char                  map_kind;
1308     enum omp_clause_proc_bind_kind proc_bind_kind;
1309     enum tree_code                 reduction_code;
1310   } GTY ((skip)) subcode;
1311
1312   /* The gimplification of OMP_CLAUSE_REDUCTION_{INIT,MERGE} for omp-low's
1313      usage.  */
1314   gimple_seq gimple_reduction_init;
1315   gimple_seq gimple_reduction_merge;
1316
1317   tree GTY ((length ("omp_clause_num_ops[OMP_CLAUSE_CODE ((tree)&%h)]")))
1318     ops[1];
1319 };
1320
1321 struct GTY(()) tree_block {
1322   struct tree_base base;
1323   tree chain;
1324
1325   unsigned abstract_flag : 1;
1326   unsigned block_num : 31;
1327
1328   location_t locus;
1329   location_t end_locus;
1330
1331   tree vars;
1332   vec<tree, va_gc> *nonlocalized_vars;
1333
1334   tree subblocks;
1335   tree supercontext;
1336   tree abstract_origin;
1337   tree fragment_origin;
1338   tree fragment_chain;
1339
1340   /* Pointer to the DWARF lexical block.  */
1341   struct die_struct *die;
1342 };
1343
1344 struct GTY(()) tree_type_common {
1345   struct tree_common common;
1346   tree size;
1347   tree size_unit;
1348   tree attributes;
1349   unsigned int uid;
1350
1351   unsigned int precision : 10;
1352   unsigned no_force_blk_flag : 1;
1353   unsigned needs_constructing_flag : 1;
1354   unsigned transparent_aggr_flag : 1;
1355   unsigned restrict_flag : 1;
1356   unsigned contains_placeholder_bits : 2;
1357
1358   ENUM_BITFIELD(machine_mode) mode : 8;
1359
1360   unsigned string_flag : 1;
1361   unsigned lang_flag_0 : 1;
1362   unsigned lang_flag_1 : 1;
1363   unsigned lang_flag_2 : 1;
1364   unsigned lang_flag_3 : 1;
1365   unsigned lang_flag_4 : 1;
1366   unsigned lang_flag_5 : 1;
1367   unsigned lang_flag_6 : 1;
1368
1369   unsigned int align;
1370   alias_set_type alias_set;
1371   tree pointer_to;
1372   tree reference_to;
1373   union tree_type_symtab {
1374     int GTY ((tag ("TYPE_SYMTAB_IS_ADDRESS"))) address;
1375     const char * GTY ((tag ("TYPE_SYMTAB_IS_POINTER"))) pointer;
1376     struct die_struct * GTY ((tag ("TYPE_SYMTAB_IS_DIE"))) die;
1377   } GTY ((desc ("debug_hooks->tree_type_symtab_field"))) symtab;
1378   tree canonical;
1379   tree next_variant;
1380   tree main_variant;
1381   tree context;
1382   tree name;
1383 };
1384
1385 struct GTY(()) tree_type_with_lang_specific {
1386   struct tree_type_common common;
1387   /* Points to a structure whose details depend on the language in use.  */
1388   struct lang_type *lang_specific;
1389 };
1390
1391 struct GTY(()) tree_type_non_common {
1392   struct tree_type_with_lang_specific with_lang_specific;
1393   tree values;
1394   tree minval;
1395   tree maxval;
1396   tree binfo;
1397 };
1398
1399 struct GTY (()) tree_binfo {
1400   struct tree_common common;
1401
1402   tree offset;
1403   tree vtable;
1404   tree virtuals;
1405   tree vptr_field;
1406   vec<tree, va_gc> *base_accesses;
1407   tree inheritance;
1408
1409   tree vtt_subvtt;
1410   tree vtt_vptr;
1411
1412   vec<tree, va_gc> base_binfos;
1413 };
1414
1415 struct GTY(()) tree_decl_minimal {
1416   struct tree_common common;
1417   location_t locus;
1418   unsigned int uid;
1419   tree name;
1420   tree context;
1421 };
1422
1423 struct GTY(()) tree_decl_common {
1424   struct tree_decl_minimal common;
1425   tree size;
1426
1427   ENUM_BITFIELD(machine_mode) mode : 8;
1428
1429   unsigned nonlocal_flag : 1;
1430   unsigned virtual_flag : 1;
1431   unsigned ignored_flag : 1;
1432   unsigned abstract_flag : 1;
1433   unsigned artificial_flag : 1;
1434   unsigned preserve_flag: 1;
1435   unsigned debug_expr_is_from : 1;
1436
1437   unsigned lang_flag_0 : 1;
1438   unsigned lang_flag_1 : 1;
1439   unsigned lang_flag_2 : 1;
1440   unsigned lang_flag_3 : 1;
1441   unsigned lang_flag_4 : 1;
1442   unsigned lang_flag_5 : 1;
1443   unsigned lang_flag_6 : 1;
1444   unsigned lang_flag_7 : 1;
1445   unsigned lang_flag_8 : 1;
1446
1447   /* In VAR_DECL and PARM_DECL, this is DECL_REGISTER.  */
1448   unsigned decl_flag_0 : 1;
1449   /* In FIELD_DECL, this is DECL_BIT_FIELD
1450      In VAR_DECL and FUNCTION_DECL, this is DECL_EXTERNAL.
1451      In TYPE_DECL, this is TYPE_DECL_SUPPRESS_DEBUG.  */
1452   unsigned decl_flag_1 : 1;
1453   /* In FIELD_DECL, this is DECL_NONADDRESSABLE_P
1454      In VAR_DECL, PARM_DECL and RESULT_DECL, this is
1455      DECL_HAS_VALUE_EXPR_P.  */
1456   unsigned decl_flag_2 : 1;
1457   /* 1 bit unused.  */
1458   unsigned decl_flag_3 : 1;
1459   /* Logically, these two would go in a theoretical base shared by var and
1460      parm decl. */
1461   unsigned gimple_reg_flag : 1;
1462   /* In VAR_DECL, PARM_DECL and RESULT_DECL, this is DECL_BY_REFERENCE.  */
1463   unsigned decl_by_reference_flag : 1;
1464   /* In a VAR_DECL and PARM_DECL, this is DECL_READ_P.  */
1465   unsigned decl_read_flag : 1;
1466   /* In a VAR_DECL or RESULT_DECL, this is DECL_NONSHAREABLE.  */
1467   unsigned decl_nonshareable_flag : 1;
1468
1469   /* DECL_OFFSET_ALIGN, used only for FIELD_DECLs.  */
1470   unsigned int off_align : 8;
1471
1472   /* 24 bits unused.  */
1473
1474   /* DECL_ALIGN.  It should have the same size as TYPE_ALIGN.  */
1475   unsigned int align;
1476
1477   /* UID for points-to sets, stable over copying from inlining.  */
1478   unsigned int pt_uid;
1479
1480   tree size_unit;
1481   tree initial;
1482   tree attributes;
1483   tree abstract_origin;
1484
1485   /* Points to a structure whose details depend on the language in use.  */
1486   struct lang_decl *lang_specific;
1487 };
1488
1489 struct GTY(()) tree_decl_with_rtl {
1490   struct tree_decl_common common;
1491   rtx rtl;
1492 };
1493
1494 struct GTY(()) tree_field_decl {
1495   struct tree_decl_common common;
1496
1497   tree offset;
1498   tree bit_field_type;
1499   tree qualifier;
1500   tree bit_offset;
1501   tree fcontext;
1502 };
1503
1504 struct GTY(()) tree_label_decl {
1505   struct tree_decl_with_rtl common;
1506   int label_decl_uid;
1507   int eh_landing_pad_nr;
1508 };
1509
1510 struct GTY(()) tree_result_decl {
1511   struct tree_decl_with_rtl common;
1512 };
1513
1514 struct GTY(()) tree_const_decl {
1515   struct tree_decl_common common;
1516 };
1517
1518 struct GTY(()) tree_parm_decl {
1519   struct tree_decl_with_rtl common;
1520   rtx incoming_rtl;
1521 };
1522
1523 struct GTY(()) tree_decl_with_vis {
1524  struct tree_decl_with_rtl common;
1525  tree assembler_name;
1526  struct symtab_node *symtab_node;
1527
1528  /* Belong to VAR_DECL exclusively.  */
1529  unsigned defer_output : 1;
1530  unsigned hard_register : 1;
1531  unsigned common_flag : 1;
1532  unsigned in_text_section : 1;
1533  unsigned in_constant_pool : 1;
1534  unsigned dllimport_flag : 1;
1535  /* Don't belong to VAR_DECL exclusively.  */
1536  unsigned weak_flag : 1;
1537
1538  unsigned seen_in_bind_expr : 1;
1539  unsigned comdat_flag : 1;
1540  /* Used for FUNCTION_DECL, VAR_DECL and in C++ for TYPE_DECL.  */
1541  ENUM_BITFIELD(symbol_visibility) visibility : 2;
1542  unsigned visibility_specified : 1;
1543
1544  /* Belong to FUNCTION_DECL exclusively.  */
1545  unsigned init_priority_p : 1;
1546  /* Used by C++ only.  Might become a generic decl flag.  */
1547  unsigned shadowed_for_var_p : 1;
1548  /* Belong to FUNCTION_DECL exclusively.  */
1549  unsigned cxx_constructor : 1;
1550  /* Belong to FUNCTION_DECL exclusively.  */
1551  unsigned cxx_destructor : 1;
1552  /* Belong to FUNCTION_DECL exclusively.  */
1553  unsigned final : 1;
1554  /* Belong to FUNCTION_DECL exclusively.  */
1555  unsigned regdecl_flag : 1;
1556  /* 14 unused bits. */
1557 };
1558
1559 struct GTY(()) tree_var_decl {
1560   struct tree_decl_with_vis common;
1561 };
1562
1563 struct GTY(()) tree_decl_non_common {
1564   struct tree_decl_with_vis common;
1565   /* Almost all FE's use this.  */
1566   tree result;
1567 };
1568
1569 /* FUNCTION_DECL inherits from DECL_NON_COMMON because of the use of the
1570    arguments/result/saved_tree fields by front ends.   It was either inherit
1571    FUNCTION_DECL from non_common, or inherit non_common from FUNCTION_DECL,
1572    which seemed a bit strange.  */
1573
1574 struct GTY(()) tree_function_decl {
1575   struct tree_decl_non_common common;
1576
1577   struct function *f;
1578
1579   /* Arguments of the function.  */
1580   tree arguments;
1581   /* The personality function. Used for stack unwinding. */
1582   tree personality;
1583
1584   /* Function specific options that are used by this function.  */
1585   tree function_specific_target;        /* target options */
1586   tree function_specific_optimization;  /* optimization options */
1587
1588   /* Generic function body.  */
1589   tree saved_tree;
1590   /* Index within a virtual table.  */
1591   tree vindex;
1592
1593   /* In a FUNCTION_DECL for which DECL_BUILT_IN holds, this is
1594      DECL_FUNCTION_CODE.  Otherwise unused.
1595      ???  The bitfield needs to be able to hold all target function
1596           codes as well.  */
1597   ENUM_BITFIELD(built_in_function) function_code : 12;
1598   ENUM_BITFIELD(built_in_class) built_in_class : 2;
1599
1600   unsigned static_ctor_flag : 1;
1601   unsigned static_dtor_flag : 1;
1602
1603   unsigned uninlinable : 1;
1604   unsigned possibly_inlined : 1;
1605   unsigned novops_flag : 1;
1606   unsigned returns_twice_flag : 1;
1607   unsigned malloc_flag : 1;
1608   unsigned operator_new_flag : 1;
1609   unsigned declared_inline_flag : 1;
1610   unsigned no_inline_warning_flag : 1;
1611
1612   unsigned no_instrument_function_entry_exit : 1;
1613   unsigned no_limit_stack : 1;
1614   unsigned disregard_inline_limits : 1;
1615   unsigned pure_flag : 1;
1616   unsigned looping_const_or_pure_flag : 1;
1617   unsigned has_debug_args_flag : 1;
1618   unsigned tm_clone_flag : 1;
1619   unsigned versioned_function : 1;
1620   /* No bits left.  */
1621 };
1622
1623 struct GTY(()) tree_translation_unit_decl {
1624   struct tree_decl_common common;
1625   /* Source language of this translation unit.  Used for DWARF output.  */
1626   const char * GTY((skip(""))) language;
1627   /* TODO: Non-optimization used to build this translation unit.  */
1628   /* TODO: Root of a partial DWARF tree for global types and decls.  */
1629 };
1630
1631 struct GTY(()) tree_type_decl {
1632   struct tree_decl_non_common common;
1633
1634 };
1635
1636 struct GTY ((chain_next ("%h.next"), chain_prev ("%h.prev"))) tree_statement_list_node
1637  {
1638   struct tree_statement_list_node *prev;
1639   struct tree_statement_list_node *next;
1640   tree stmt;
1641 };
1642
1643 struct GTY(()) tree_statement_list
1644  {
1645   struct tree_typed typed;
1646   struct tree_statement_list_node *head;
1647   struct tree_statement_list_node *tail;
1648 };
1649
1650
1651 /* Optimization options used by a function.  */
1652
1653 struct GTY(()) tree_optimization_option {
1654   struct tree_common common;
1655
1656   /* The optimization options used by the user.  */
1657   struct cl_optimization *opts;
1658
1659   /* Target optabs for this set of optimization options.  This is of
1660      type `struct target_optabs *'.  */
1661   void *GTY ((atomic)) optabs;
1662
1663   /* The value of this_target_optabs against which the optabs above were
1664      generated.  */
1665   struct target_optabs *GTY ((skip)) base_optabs;
1666 };
1667
1668 /* Forward declaration, defined in target-globals.h.  */
1669
1670 struct GTY(()) target_globals;
1671
1672 /* Target options used by a function.  */
1673
1674 struct GTY(()) tree_target_option {
1675   struct tree_common common;
1676
1677   /* Target globals for the corresponding target option.  */
1678   struct target_globals *globals;
1679
1680   /* The optimization options used by the user.  */
1681   struct cl_target_option *opts;
1682 };
1683
1684 /* Define the overall contents of a tree node.
1685    It may be any of the structures declared above
1686    for various types of node.  */
1687 union GTY ((ptr_alias (union lang_tree_node),
1688             desc ("tree_node_structure (&%h)"), variable_size)) tree_node {
1689   struct tree_base GTY ((tag ("TS_BASE"))) base;
1690   struct tree_typed GTY ((tag ("TS_TYPED"))) typed;
1691   struct tree_common GTY ((tag ("TS_COMMON"))) common;
1692   struct tree_int_cst GTY ((tag ("TS_INT_CST"))) int_cst;
1693   struct tree_real_cst GTY ((tag ("TS_REAL_CST"))) real_cst;
1694   struct tree_fixed_cst GTY ((tag ("TS_FIXED_CST"))) fixed_cst;
1695   struct tree_vector GTY ((tag ("TS_VECTOR"))) vector;
1696   struct tree_string GTY ((tag ("TS_STRING"))) string;
1697   struct tree_complex GTY ((tag ("TS_COMPLEX"))) complex;
1698   struct tree_identifier GTY ((tag ("TS_IDENTIFIER"))) identifier;
1699   struct tree_decl_minimal GTY((tag ("TS_DECL_MINIMAL"))) decl_minimal;
1700   struct tree_decl_common GTY ((tag ("TS_DECL_COMMON"))) decl_common;
1701   struct tree_decl_with_rtl GTY ((tag ("TS_DECL_WRTL"))) decl_with_rtl;
1702   struct tree_decl_non_common  GTY ((tag ("TS_DECL_NON_COMMON")))
1703     decl_non_common;
1704   struct tree_parm_decl  GTY  ((tag ("TS_PARM_DECL"))) parm_decl;
1705   struct tree_decl_with_vis GTY ((tag ("TS_DECL_WITH_VIS"))) decl_with_vis;
1706   struct tree_var_decl GTY ((tag ("TS_VAR_DECL"))) var_decl;
1707   struct tree_field_decl GTY ((tag ("TS_FIELD_DECL"))) field_decl;
1708   struct tree_label_decl GTY ((tag ("TS_LABEL_DECL"))) label_decl;
1709   struct tree_result_decl GTY ((tag ("TS_RESULT_DECL"))) result_decl;
1710   struct tree_const_decl GTY ((tag ("TS_CONST_DECL"))) const_decl;
1711   struct tree_type_decl GTY ((tag ("TS_TYPE_DECL"))) type_decl;
1712   struct tree_function_decl GTY ((tag ("TS_FUNCTION_DECL"))) function_decl;
1713   struct tree_translation_unit_decl GTY ((tag ("TS_TRANSLATION_UNIT_DECL")))
1714     translation_unit_decl;
1715   struct tree_type_common GTY ((tag ("TS_TYPE_COMMON"))) type_common;
1716   struct tree_type_with_lang_specific GTY ((tag ("TS_TYPE_WITH_LANG_SPECIFIC")))
1717     type_with_lang_specific;
1718   struct tree_type_non_common GTY ((tag ("TS_TYPE_NON_COMMON")))
1719     type_non_common;
1720   struct tree_list GTY ((tag ("TS_LIST"))) list;
1721   struct tree_vec GTY ((tag ("TS_VEC"))) vec;
1722   struct tree_exp GTY ((tag ("TS_EXP"))) exp;
1723   struct tree_ssa_name GTY ((tag ("TS_SSA_NAME"))) ssa_name;
1724   struct tree_block GTY ((tag ("TS_BLOCK"))) block;
1725   struct tree_binfo GTY ((tag ("TS_BINFO"))) binfo;
1726   struct tree_statement_list GTY ((tag ("TS_STATEMENT_LIST"))) stmt_list;
1727   struct tree_constructor GTY ((tag ("TS_CONSTRUCTOR"))) constructor;
1728   struct tree_omp_clause GTY ((tag ("TS_OMP_CLAUSE"))) omp_clause;
1729   struct tree_optimization_option GTY ((tag ("TS_OPTIMIZATION"))) optimization;
1730   struct tree_target_option GTY ((tag ("TS_TARGET_OPTION"))) target_option;
1731 };
1732
1733 /* Structure describing an attribute and a function to handle it.  */
1734 struct attribute_spec {
1735   /* The name of the attribute (without any leading or trailing __),
1736      or NULL to mark the end of a table of attributes.  */
1737   const char *name;
1738   /* The minimum length of the list of arguments of the attribute.  */
1739   int min_length;
1740   /* The maximum length of the list of arguments of the attribute
1741      (-1 for no maximum).  */
1742   int max_length;
1743   /* Whether this attribute requires a DECL.  If it does, it will be passed
1744      from types of DECLs, function return types and array element types to
1745      the DECLs, function types and array types respectively; but when
1746      applied to a type in any other circumstances, it will be ignored with
1747      a warning.  (If greater control is desired for a given attribute,
1748      this should be false, and the flags argument to the handler may be
1749      used to gain greater control in that case.)  */
1750   bool decl_required;
1751   /* Whether this attribute requires a type.  If it does, it will be passed
1752      from a DECL to the type of that DECL.  */
1753   bool type_required;
1754   /* Whether this attribute requires a function (or method) type.  If it does,
1755      it will be passed from a function pointer type to the target type,
1756      and from a function return type (which is not itself a function
1757      pointer type) to the function type.  */
1758   bool function_type_required;
1759   /* Function to handle this attribute.  NODE points to the node to which
1760      the attribute is to be applied.  If a DECL, it should be modified in
1761      place; if a TYPE, a copy should be created.  NAME is the name of the
1762      attribute (possibly with leading or trailing __).  ARGS is the TREE_LIST
1763      of the arguments (which may be NULL).  FLAGS gives further information
1764      about the context of the attribute.  Afterwards, the attributes will
1765      be added to the DECL_ATTRIBUTES or TYPE_ATTRIBUTES, as appropriate,
1766      unless *NO_ADD_ATTRS is set to true (which should be done on error,
1767      as well as in any other cases when the attributes should not be added
1768      to the DECL or TYPE).  Depending on FLAGS, any attributes to be
1769      applied to another type or DECL later may be returned;
1770      otherwise the return value should be NULL_TREE.  This pointer may be
1771      NULL if no special handling is required beyond the checks implied
1772      by the rest of this structure.  */
1773   tree (*handler) (tree *node, tree name, tree args,
1774                    int flags, bool *no_add_attrs);
1775   /* Specifies if attribute affects type's identity.  */
1776   bool affects_type_identity;
1777 };
1778
1779 /* These functions allow a front-end to perform a manual layout of a
1780    RECORD_TYPE.  (For instance, if the placement of subsequent fields
1781    depends on the placement of fields so far.)  Begin by calling
1782    start_record_layout.  Then, call place_field for each of the
1783    fields.  Then, call finish_record_layout.  See layout_type for the
1784    default way in which these functions are used.  */
1785 typedef struct record_layout_info_s {
1786   /* The RECORD_TYPE that we are laying out.  */
1787   tree t;
1788   /* The offset into the record so far, in bytes, not including bits in
1789      BITPOS.  */
1790   tree offset;
1791   /* The last known alignment of SIZE.  */
1792   unsigned int offset_align;
1793   /* The bit position within the last OFFSET_ALIGN bits, in bits.  */
1794   tree bitpos;
1795   /* The alignment of the record so far, in bits.  */
1796   unsigned int record_align;
1797   /* The alignment of the record so far, ignoring #pragma pack and
1798      __attribute__ ((packed)), in bits.  */
1799   unsigned int unpacked_align;
1800   /* The previous field laid out.  */
1801   tree prev_field;
1802   /* The static variables (i.e., class variables, as opposed to
1803      instance variables) encountered in T.  */
1804   vec<tree, va_gc> *pending_statics;
1805   /* Bits remaining in the current alignment group */
1806   int remaining_in_alignment;
1807   /* True if we've seen a packed field that didn't have normal
1808      alignment anyway.  */
1809   int packed_maybe_necessary;
1810 } *record_layout_info;
1811
1812 /* Iterator for going through the function arguments.  */
1813 struct function_args_iterator {
1814   tree next;                    /* TREE_LIST pointing to the next argument */
1815 };
1816
1817 /* Structures to map from a tree to another tree.  */
1818 struct GTY(()) tree_map_base {
1819   tree from;
1820 };
1821
1822 /* Map from a tree to another tree.  */
1823
1824 struct GTY((for_user)) tree_map {
1825   struct tree_map_base base;
1826   unsigned int hash;
1827   tree to;
1828 };
1829
1830 /* Map from a decl tree to another tree.  */
1831 struct GTY((for_user)) tree_decl_map {
1832   struct tree_map_base base;
1833   tree to;
1834 };
1835
1836 /* Map from a tree to an int.  */
1837 struct GTY((for_user)) tree_int_map {
1838   struct tree_map_base base;
1839   unsigned int to;
1840 };
1841
1842 /* Map from a decl tree to a tree vector.  */
1843 struct GTY((for_user)) tree_vec_map {
1844   struct tree_map_base base;
1845   vec<tree, va_gc> *to;
1846 };
1847
1848 /* Abstract iterators for CALL_EXPRs.  These static inline definitions
1849    have to go towards the end of tree.h so that union tree_node is fully
1850    defined by this point.  */
1851
1852 /* Structure containing iterator state.  */
1853 struct call_expr_arg_iterator {
1854   tree t;       /* the call_expr */
1855   int n;        /* argument count */
1856   int i;        /* next argument index */
1857 };
1858
1859 struct const_call_expr_arg_iterator {
1860   const_tree t; /* the call_expr */
1861   int n;        /* argument count */
1862   int i;        /* next argument index */
1863 };
1864
1865 /* The builtin_info structure holds the FUNCTION_DECL of the standard builtin
1866    function, and flags.  */
1867 struct GTY(()) builtin_info_type {
1868   tree decl;
1869   /* Whether the user can use <xxx> instead of explicitly using calls
1870      to __builtin_<xxx>.  */
1871   unsigned implicit_p : 1;
1872   /* Whether the user has provided a declaration of <xxx>.  */
1873   unsigned declared_p : 1;
1874 };
1875
1876
1877 /*---------------------------------------------------------------------------
1878                                 Global variables
1879 ---------------------------------------------------------------------------*/
1880 /* Matrix describing the structures contained in a given tree code.  */
1881 extern unsigned char tree_contains_struct[MAX_TREE_CODES][64];
1882
1883 /* Class of tree given its code.  */
1884 extern const enum tree_code_class tree_code_type[];
1885
1886 /* Each tree code class has an associated string representation.
1887    These must correspond to the tree_code_class entries.  */
1888 extern const char *const tree_code_class_strings[];
1889
1890 /* Number of argument-words in each kind of tree-node.  */
1891 extern const unsigned char tree_code_length[];
1892
1893 /* Vector of all alias pairs for global symbols.  */
1894 extern GTY(()) vec<alias_pair, va_gc> *alias_pairs;
1895
1896 /* Names of all the built_in classes.  */
1897 extern const char *const built_in_class_names[BUILT_IN_LAST];
1898
1899 /* Names of all the built_in functions.  */
1900 extern const char * built_in_names[(int) END_BUILTINS];
1901
1902 /* Number of operands and names for each OMP_CLAUSE node.  */
1903 extern unsigned const char omp_clause_num_ops[];
1904 extern const char * const omp_clause_code_name[];
1905
1906 /* A vector of all translation-units.  */
1907 extern GTY (()) vec<tree, va_gc> *all_translation_units;
1908
1909 /* Vector of standard trees used by the C compiler.  */
1910 extern GTY(()) tree global_trees[TI_MAX];
1911
1912 /* The standard C integer types.  Use integer_type_kind to index into
1913    this array.  */
1914 extern GTY(()) tree integer_types[itk_none];
1915
1916 /* Types used to represent sizes.  */
1917 extern GTY(()) tree sizetype_tab[(int) stk_type_kind_last];
1918
1919 /* Arrays for keeping track of tree node statistics.  */
1920 extern int tree_node_counts[];
1921 extern int tree_node_sizes[];
1922
1923 /* True if we are in gimple form and the actions of the folders need to
1924    be restricted.  False if we are not in gimple form and folding is not
1925    restricted to creating gimple expressions.  */
1926 extern bool in_gimple_form;
1927
1928 /* Functional interface to the builtin functions.  */
1929 extern GTY(()) builtin_info_type builtin_info[(int)END_BUILTINS];
1930
1931 /* If nonzero, an upper limit on alignment of structure fields, in bits,  */
1932 extern unsigned int maximum_field_alignment;
1933
1934 /* Points to the FUNCTION_DECL of the function whose body we are reading.  */
1935 extern GTY(()) tree current_function_decl;
1936
1937 /* Nonzero means a FUNC_BEGIN label was emitted.  */
1938 extern GTY(()) const char * current_function_func_begin_label;
1939
1940 #endif  // GCC_TREE_CORE_H