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      Operand 4: OMP_CLAUSE_REDUCTION_DECL_PLACEHOLDER: Another dummy
 237                 VAR_DECL placeholder, used like the above for C/C++ array
 238                 reductions.  */
 239   OMP_CLAUSE_REDUCTION,
 240
 241   /* OpenMP clause: copyin (variable_list).  */
 242   OMP_CLAUSE_COPYIN,
 243
 244   /* OpenMP clause: copyprivate (variable_list).  */
 245   OMP_CLAUSE_COPYPRIVATE,
 246
 247   /* OpenMP clause: linear (variable-list[:linear-step]).  */
 248   OMP_CLAUSE_LINEAR,
 249
 250   /* OpenMP clause: aligned (variable-list[:alignment]).  */
 251   OMP_CLAUSE_ALIGNED,
 252
 253   /* OpenMP clause: depend ({in,out,inout}:variable-list).  */
 254   OMP_CLAUSE_DEPEND,
 255
 256   /* OpenMP clause: uniform (argument-list).  */
 257   OMP_CLAUSE_UNIFORM,
 258
 259   /* OpenMP clause: to (extended-list).
 260      Only when it appears in declare target.  */
 261   OMP_CLAUSE_TO_DECLARE,
 262
 263   /* OpenMP clause: link (variable-list).  */
 264   OMP_CLAUSE_LINK,
 265
 266   /* OpenMP clause: from (variable-list).  */
 267   OMP_CLAUSE_FROM,
 268
 269   /* OpenMP clause: to (variable-list).  */
 270   OMP_CLAUSE_TO,
 271
 272   /* OpenACC clauses: {copy, copyin, copyout, create, delete, deviceptr,
 273      device, host (self), present, present_or_copy (pcopy), present_or_copyin
 274      (pcopyin), present_or_copyout (pcopyout), present_or_create (pcreate)}
 275      (variable-list).
 276
 277      OpenMP clause: map ({alloc:,to:,from:,tofrom:,}variable-list).  */
 278   OMP_CLAUSE_MAP,
 279
 280   /* OpenMP clause: use_device_ptr (variable-list).  */
 281   OMP_CLAUSE_USE_DEVICE_PTR,
 282
 283   /* OpenMP clause: is_device_ptr (variable-list).  */
 284   OMP_CLAUSE_IS_DEVICE_PTR,
 285
 286   /* Internal structure to hold OpenACC cache directive's variable-list.
 287      #pragma acc cache (variable-list).  */
 288   OMP_CLAUSE__CACHE_,
 289
 290   /* OpenACC clause: device_resident (variable_list).  */
 291   OMP_CLAUSE_DEVICE_RESIDENT,
 292
 293   /* OpenACC clause: use_device (variable_list).  */
 294   OMP_CLAUSE_USE_DEVICE,
 295
 296   /* OpenACC clause: gang [(gang-argument-list)].
 297      Where
 298       gang-argument-list: [gang-argument-list, ] gang-argument
 299       gang-argument: [num:] integer-expression
 300                    | static: size-expression
 301       size-expression: * | integer-expression.  */
 302   OMP_CLAUSE_GANG,
 303
 304   /* OpenACC clause: async [(integer-expression)].  */
 305   OMP_CLAUSE_ASYNC,
 306
 307   /* OpenACC clause: wait [(integer-expression-list)].  */
 308   OMP_CLAUSE_WAIT,
 309
 310   /* OpenACC clause: auto.  */
 311   OMP_CLAUSE_AUTO,
 312
 313   /* OpenACC clause: seq.  */
 314   OMP_CLAUSE_SEQ,
 315
 316   /* Internal clause: temporary for combined loops expansion.  */
 317   OMP_CLAUSE__LOOPTEMP_,
 318
 319   /* OpenACC/OpenMP clause: if (scalar-expression).  */
 320   OMP_CLAUSE_IF,
 321
 322   /* OpenMP clause: num_threads (integer-expression).  */
 323   OMP_CLAUSE_NUM_THREADS,
 324
 325   /* OpenMP clause: schedule.  */
 326   OMP_CLAUSE_SCHEDULE,
 327
 328   /* OpenMP clause: nowait.  */
 329   OMP_CLAUSE_NOWAIT,
 330
 331   /* OpenMP clause: ordered [(constant-integer-expression)].  */
 332   OMP_CLAUSE_ORDERED,
 333
 334   /* OpenMP clause: default.  */
 335   OMP_CLAUSE_DEFAULT,
 336
 337   /* OpenACC/OpenMP clause: collapse (constant-integer-expression).  */
 338   OMP_CLAUSE_COLLAPSE,
 339
 340   /* OpenMP clause: untied.  */
 341   OMP_CLAUSE_UNTIED,
 342
 343   /* OpenMP clause: final (scalar-expression).  */
 344   OMP_CLAUSE_FINAL,
 345
 346   /* OpenMP clause: mergeable.  */
 347   OMP_CLAUSE_MERGEABLE,
 348
 349   /* OpenMP clause: device (integer-expression).  */
 350   OMP_CLAUSE_DEVICE,
 351
 352   /* OpenMP clause: dist_schedule (static[:chunk-size]).  */
 353   OMP_CLAUSE_DIST_SCHEDULE,
 354
 355   /* OpenMP clause: inbranch.  */
 356   OMP_CLAUSE_INBRANCH,
 357
 358   /* OpenMP clause: notinbranch.  */
 359   OMP_CLAUSE_NOTINBRANCH,
 360
 361   /* OpenMP clause: num_teams(integer-expression).  */
 362   OMP_CLAUSE_NUM_TEAMS,
 363
 364   /* OpenMP clause: thread_limit(integer-expression).  */
 365   OMP_CLAUSE_THREAD_LIMIT,
 366
 367   /* OpenMP clause: proc_bind ({master,close,spread}).  */
 368   OMP_CLAUSE_PROC_BIND,
 369
 370   /* OpenMP clause: safelen (constant-integer-expression).  */
 371   OMP_CLAUSE_SAFELEN,
 372
 373   /* OpenMP clause: simdlen (constant-integer-expression).  */
 374   OMP_CLAUSE_SIMDLEN,
 375
 376   /* OpenMP clause: for.  */
 377   OMP_CLAUSE_FOR,
 378
 379   /* OpenMP clause: parallel.  */
 380   OMP_CLAUSE_PARALLEL,
 381
 382   /* OpenMP clause: sections.  */
 383   OMP_CLAUSE_SECTIONS,
 384
 385   /* OpenMP clause: taskgroup.  */
 386   OMP_CLAUSE_TASKGROUP,
 387
 388   /* OpenMP clause: priority (integer-expression).  */
 389   OMP_CLAUSE_PRIORITY,
 390
 391   /* OpenMP clause: grainsize (integer-expression).  */
 392   OMP_CLAUSE_GRAINSIZE,
 393
 394   /* OpenMP clause: num_tasks (integer-expression).  */
 395   OMP_CLAUSE_NUM_TASKS,
 396
 397   /* OpenMP clause: nogroup.  */
 398   OMP_CLAUSE_NOGROUP,
 399
 400   /* OpenMP clause: threads.  */
 401   OMP_CLAUSE_THREADS,
 402
 403   /* OpenMP clause: simd.  */
 404   OMP_CLAUSE_SIMD,
 405
 406   /* OpenMP clause: hint (integer-expression).  */
 407   OMP_CLAUSE_HINT,
 408
 409   /* OpenMP clause: defaultmap (tofrom: scalar).  */
 410   OMP_CLAUSE_DEFAULTMAP,
 411
 412   /* Internally used only clause, holding SIMD uid.  */
 413   OMP_CLAUSE__SIMDUID_,
 414
 415   /* Internally used only clause, holding _Cilk_for # of iterations
 416      on OMP_PARALLEL.  */
 417   OMP_CLAUSE__CILK_FOR_COUNT_,
 418
 419   /* OpenACC clause: independent.  */
 420   OMP_CLAUSE_INDEPENDENT,
 421
 422   /* OpenACC clause: worker [( [num:] integer-expression)].  */
 423   OMP_CLAUSE_WORKER,
 424
 425   /* OpenACC clause: vector [( [length:] integer-expression)].  */
 426   OMP_CLAUSE_VECTOR,
 427
 428   /* OpenACC clause: num_gangs (integer-expression).  */
 429   OMP_CLAUSE_NUM_GANGS,
 430
 431   /* OpenACC clause: num_workers (integer-expression).  */
 432   OMP_CLAUSE_NUM_WORKERS,
 433
 434   /* OpenACC clause: vector_length (integer-expression).  */
 435   OMP_CLAUSE_VECTOR_LENGTH,
 436
 437   /* OpenACC clause: tile ( size-expr-list ).  */
 438   OMP_CLAUSE_TILE
 439 };
 440
 441 #undef DEFTREESTRUCT
 442 #define DEFTREESTRUCT(ENUM, NAME) ENUM,
 443 enum tree_node_structure_enum {
 444 #include "treestruct.def"
 445   LAST_TS_ENUM
 446 };
 447 #undef DEFTREESTRUCT
 448
 449 enum omp_clause_schedule_kind {
 450   OMP_CLAUSE_SCHEDULE_STATIC,
 451   OMP_CLAUSE_SCHEDULE_DYNAMIC,
 452   OMP_CLAUSE_SCHEDULE_GUIDED,
 453   OMP_CLAUSE_SCHEDULE_AUTO,
 454   OMP_CLAUSE_SCHEDULE_RUNTIME,
 455   OMP_CLAUSE_SCHEDULE_CILKFOR,
 456   OMP_CLAUSE_SCHEDULE_MASK = (1 << 3) - 1,
 457   OMP_CLAUSE_SCHEDULE_MONOTONIC = (1 << 3),
 458   OMP_CLAUSE_SCHEDULE_NONMONOTONIC = (1 << 4),
 459   OMP_CLAUSE_SCHEDULE_LAST = 2 * OMP_CLAUSE_SCHEDULE_NONMONOTONIC - 1
 460 };
 461
 462 enum omp_clause_default_kind {
 463   OMP_CLAUSE_DEFAULT_UNSPECIFIED,
 464   OMP_CLAUSE_DEFAULT_SHARED,
 465   OMP_CLAUSE_DEFAULT_NONE,
 466   OMP_CLAUSE_DEFAULT_PRIVATE,
 467   OMP_CLAUSE_DEFAULT_FIRSTPRIVATE,
 468   OMP_CLAUSE_DEFAULT_LAST
 469 };
 470
 471 /* There is a TYPE_QUAL value for each type qualifier.  They can be
 472    combined by bitwise-or to form the complete set of qualifiers for a
 473    type.  */
 474 enum cv_qualifier {
 475   TYPE_UNQUALIFIED   = 0x0,
 476   TYPE_QUAL_CONST    = 0x1,
 477   TYPE_QUAL_VOLATILE = 0x2,
 478   TYPE_QUAL_RESTRICT = 0x4,
 479   TYPE_QUAL_ATOMIC   = 0x8
 480 };
 481
 482 /* Standard named or nameless data types of the C compiler.  */
 483 enum tree_index {
 484   TI_ERROR_MARK,
 485   TI_INTQI_TYPE,
 486   TI_INTHI_TYPE,
 487   TI_INTSI_TYPE,
 488   TI_INTDI_TYPE,
 489   TI_INTTI_TYPE,
 490
 491   TI_UINTQI_TYPE,
 492   TI_UINTHI_TYPE,
 493   TI_UINTSI_TYPE,
 494   TI_UINTDI_TYPE,
 495   TI_UINTTI_TYPE,
 496
 497   TI_ATOMICQI_TYPE,
 498   TI_ATOMICHI_TYPE,
 499   TI_ATOMICSI_TYPE,
 500   TI_ATOMICDI_TYPE,
 501   TI_ATOMICTI_TYPE,
 502
 503   TI_UINT16_TYPE,
 504   TI_UINT32_TYPE,
 505   TI_UINT64_TYPE,
 506
 507   TI_VOID,
 508
 509   TI_INTEGER_ZERO,
 510   TI_INTEGER_ONE,
 511   TI_INTEGER_THREE,
 512   TI_INTEGER_MINUS_ONE,
 513   TI_NULL_POINTER,
 514
 515   TI_SIZE_ZERO,
 516   TI_SIZE_ONE,
 517
 518   TI_BITSIZE_ZERO,
 519   TI_BITSIZE_ONE,
 520   TI_BITSIZE_UNIT,
 521
 522   TI_PUBLIC,
 523   TI_PROTECTED,
 524   TI_PRIVATE,
 525
 526   TI_BOOLEAN_FALSE,
 527   TI_BOOLEAN_TRUE,
 528
 529   TI_COMPLEX_INTEGER_TYPE,
 530   TI_COMPLEX_FLOAT_TYPE,
 531   TI_COMPLEX_DOUBLE_TYPE,
 532   TI_COMPLEX_LONG_DOUBLE_TYPE,
 533
 534   TI_FLOAT_TYPE,
 535   TI_DOUBLE_TYPE,
 536   TI_LONG_DOUBLE_TYPE,
 537
 538   TI_FLOAT_PTR_TYPE,
 539   TI_DOUBLE_PTR_TYPE,
 540   TI_LONG_DOUBLE_PTR_TYPE,
 541   TI_INTEGER_PTR_TYPE,
 542
 543   TI_VOID_TYPE,
 544   TI_PTR_TYPE,
 545   TI_CONST_PTR_TYPE,
 546   TI_SIZE_TYPE,
 547   TI_PID_TYPE,
 548   TI_PTRDIFF_TYPE,
 549   TI_VA_LIST_TYPE,
 550   TI_VA_LIST_GPR_COUNTER_FIELD,
 551   TI_VA_LIST_FPR_COUNTER_FIELD,
 552   TI_BOOLEAN_TYPE,
 553   TI_FILEPTR_TYPE,
 554   TI_POINTER_SIZED_TYPE,
 555
 556   TI_POINTER_BOUNDS_TYPE,
 557
 558   TI_DFLOAT32_TYPE,
 559   TI_DFLOAT64_TYPE,
 560   TI_DFLOAT128_TYPE,
 561   TI_DFLOAT32_PTR_TYPE,
 562   TI_DFLOAT64_PTR_TYPE,
 563   TI_DFLOAT128_PTR_TYPE,
 564
 565   TI_VOID_LIST_NODE,
 566
 567   TI_MAIN_IDENTIFIER,
 568
 569   TI_SAT_SFRACT_TYPE,
 570   TI_SAT_FRACT_TYPE,
 571   TI_SAT_LFRACT_TYPE,
 572   TI_SAT_LLFRACT_TYPE,
 573   TI_SAT_USFRACT_TYPE,
 574   TI_SAT_UFRACT_TYPE,
 575   TI_SAT_ULFRACT_TYPE,
 576   TI_SAT_ULLFRACT_TYPE,
 577   TI_SFRACT_TYPE,
 578   TI_FRACT_TYPE,
 579   TI_LFRACT_TYPE,
 580   TI_LLFRACT_TYPE,
 581   TI_USFRACT_TYPE,
 582   TI_UFRACT_TYPE,
 583   TI_ULFRACT_TYPE,
 584   TI_ULLFRACT_TYPE,
 585   TI_SAT_SACCUM_TYPE,
 586   TI_SAT_ACCUM_TYPE,
 587   TI_SAT_LACCUM_TYPE,
 588   TI_SAT_LLACCUM_TYPE,
 589   TI_SAT_USACCUM_TYPE,
 590   TI_SAT_UACCUM_TYPE,
 591   TI_SAT_ULACCUM_TYPE,
 592   TI_SAT_ULLACCUM_TYPE,
 593   TI_SACCUM_TYPE,
 594   TI_ACCUM_TYPE,
 595   TI_LACCUM_TYPE,
 596   TI_LLACCUM_TYPE,
 597   TI_USACCUM_TYPE,
 598   TI_UACCUM_TYPE,
 599   TI_ULACCUM_TYPE,
 600   TI_ULLACCUM_TYPE,
 601   TI_QQ_TYPE,
 602   TI_HQ_TYPE,
 603   TI_SQ_TYPE,
 604   TI_DQ_TYPE,
 605   TI_TQ_TYPE,
 606   TI_UQQ_TYPE,
 607   TI_UHQ_TYPE,
 608   TI_USQ_TYPE,
 609   TI_UDQ_TYPE,
 610   TI_UTQ_TYPE,
 611   TI_SAT_QQ_TYPE,
 612   TI_SAT_HQ_TYPE,
 613   TI_SAT_SQ_TYPE,
 614   TI_SAT_DQ_TYPE,
 615   TI_SAT_TQ_TYPE,
 616   TI_SAT_UQQ_TYPE,
 617   TI_SAT_UHQ_TYPE,
 618   TI_SAT_USQ_TYPE,
 619   TI_SAT_UDQ_TYPE,
 620   TI_SAT_UTQ_TYPE,
 621   TI_HA_TYPE,
 622   TI_SA_TYPE,
 623   TI_DA_TYPE,
 624   TI_TA_TYPE,
 625   TI_UHA_TYPE,
 626   TI_USA_TYPE,
 627   TI_UDA_TYPE,
 628   TI_UTA_TYPE,
 629   TI_SAT_HA_TYPE,
 630   TI_SAT_SA_TYPE,
 631   TI_SAT_DA_TYPE,
 632   TI_SAT_TA_TYPE,
 633   TI_SAT_UHA_TYPE,
 634   TI_SAT_USA_TYPE,
 635   TI_SAT_UDA_TYPE,
 636   TI_SAT_UTA_TYPE,
 637
 638   TI_OPTIMIZATION_DEFAULT,
 639   TI_OPTIMIZATION_CURRENT,
 640   TI_TARGET_OPTION_DEFAULT,
 641   TI_TARGET_OPTION_CURRENT,
 642   TI_CURRENT_TARGET_PRAGMA,
 643   TI_CURRENT_OPTIMIZE_PRAGMA,
 644
 645   TI_MAX
 646 };
 647
 648 /* An enumeration of the standard C integer types.  These must be
 649    ordered so that shorter types appear before longer ones, and so
 650    that signed types appear before unsigned ones, for the correct
 651    functioning of interpret_integer() in c-lex.c.  */
 652 enum integer_type_kind {
 653   itk_char,
 654   itk_signed_char,
 655   itk_unsigned_char,
 656   itk_short,
 657   itk_unsigned_short,
 658   itk_int,
 659   itk_unsigned_int,
 660   itk_long,
 661   itk_unsigned_long,
 662   itk_long_long,
 663   itk_unsigned_long_long,
 664
 665   itk_intN_0,
 666   itk_unsigned_intN_0,
 667   itk_intN_1,
 668   itk_unsigned_intN_1,
 669   itk_intN_2,
 670   itk_unsigned_intN_2,
 671   itk_intN_3,
 672   itk_unsigned_intN_3,
 673
 674   itk_none
 675 };
 676
 677 /* A pointer-to-function member type looks like:
 678
 679      struct {
 680        __P __pfn;
 681        ptrdiff_t __delta;
 682      };
 683
 684    If __pfn is NULL, it is a NULL pointer-to-member-function.
 685
 686    (Because the vtable is always the first thing in the object, we
 687    don't need its offset.)  If the function is virtual, then PFN is
 688    one plus twice the index into the vtable; otherwise, it is just a
 689    pointer to the function.
 690
 691    Unfortunately, using the lowest bit of PFN doesn't work in
 692    architectures that don't impose alignment requirements on function
 693    addresses, or that use the lowest bit to tell one ISA from another,
 694    for example.  For such architectures, we use the lowest bit of
 695    DELTA instead of the lowest bit of the PFN, and DELTA will be
 696    multiplied by 2.  */
 697 enum ptrmemfunc_vbit_where_t {
 698   ptrmemfunc_vbit_in_pfn,
 699   ptrmemfunc_vbit_in_delta
 700 };
 701
 702 /* Flags that may be passed in the third argument of decl_attributes, and
 703    to handler functions for attributes.  */
 704 enum attribute_flags {
 705   /* The type passed in is the type of a DECL, and any attributes that
 706      should be passed in again to be applied to the DECL rather than the
 707      type should be returned.  */
 708   ATTR_FLAG_DECL_NEXT = 1,
 709   /* The type passed in is a function return type, and any attributes that
 710      should be passed in again to be applied to the function type rather
 711      than the return type should be returned.  */
 712   ATTR_FLAG_FUNCTION_NEXT = 2,
 713   /* The type passed in is an array element type, and any attributes that
 714      should be passed in again to be applied to the array type rather
 715      than the element type should be returned.  */
 716   ATTR_FLAG_ARRAY_NEXT = 4,
 717   /* The type passed in is a structure, union or enumeration type being
 718      created, and should be modified in place.  */
 719   ATTR_FLAG_TYPE_IN_PLACE = 8,
 720   /* The attributes are being applied by default to a library function whose
 721      name indicates known behavior, and should be silently ignored if they
 722      are not in fact compatible with the function type.  */
 723   ATTR_FLAG_BUILT_IN = 16,
 724   /* A given attribute has been parsed as a C++-11 attribute.  */
 725   ATTR_FLAG_CXX11 = 32
 726 };
 727
 728 /* Types used to represent sizes.  */
 729 enum size_type_kind {
 730   stk_sizetype,         /* Normal representation of sizes in bytes.  */
 731   stk_ssizetype,        /* Signed representation of sizes in bytes.  */
 732   stk_bitsizetype,      /* Normal representation of sizes in bits.  */
 733   stk_sbitsizetype,     /* Signed representation of sizes in bits.  */
 734   stk_type_kind_last
 735 };
 736
 737 enum operand_equal_flag {
 738   OEP_ONLY_CONST = 1,
 739   OEP_PURE_SAME = 2,
 740   OEP_MATCH_SIDE_EFFECTS = 4,
 741   OEP_ADDRESS_OF = 8
 742 };
 743
 744 /* Enum and arrays used for tree allocation stats.
 745    Keep in sync with tree.c:tree_node_kind_names.  */
 746 enum tree_node_kind {
 747   d_kind,
 748   t_kind,
 749   b_kind,
 750   s_kind,
 751   r_kind,
 752   e_kind,
 753   c_kind,
 754   id_kind,
 755   vec_kind,
 756   binfo_kind,
 757   ssa_name_kind,
 758   constr_kind,
 759   x_kind,
 760   lang_decl,
 761   lang_type,
 762   omp_clause_kind,
 763   all_kinds
 764 };
 765
 766 enum annot_expr_kind {
 767   annot_expr_ivdep_kind,
 768   annot_expr_no_vector_kind,
 769   annot_expr_vector_kind,
 770   annot_expr_kind_last
 771 };
 772
 773 /* Internal functions.  */
 774 enum internal_fn {
 775 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) IFN_##CODE,
 776 #include "internal-fn.def"
 777   IFN_LAST
 778 };
 779
 780 /*---------------------------------------------------------------------------
 781                                 Type definitions
 782 ---------------------------------------------------------------------------*/
 783 /* When processing aliases at the symbol table level, we need the
 784    declaration of target. For this reason we need to queue aliases and
 785    process them after all declarations has been produced.  */
 786 struct GTY(()) alias_pair {
 787   tree decl;
 788   tree target;
 789 };
 790
 791 /* An initialization priority.  */
 792 typedef unsigned short priority_type;
 793
 794 /* The type of a callback function for walking over tree structure.  */
 795 typedef tree (*walk_tree_fn) (tree *, int *, void *);
 796
 797 /* The type of a callback function that represents a custom walk_tree.  */
 798 typedef tree (*walk_tree_lh) (tree *, int *, tree (*) (tree *, int *, void *),
 799                               void *, hash_set<tree> *);
 800
 801
 802 /*---------------------------------------------------------------------------
 803                               Main data structures
 804 ---------------------------------------------------------------------------*/
 805 /* A tree node can represent a data type, a variable, an expression
 806    or a statement.  Each node has a TREE_CODE which says what kind of
 807    thing it represents.  Some common codes are:
 808    INTEGER_TYPE -- represents a type of integers.
 809    ARRAY_TYPE -- represents a type of pointer.
 810    VAR_DECL -- represents a declared variable.
 811    INTEGER_CST -- represents a constant integer value.
 812    PLUS_EXPR -- represents a sum (an expression).
 813
 814    As for the contents of a tree node: there are some fields
 815    that all nodes share.  Each TREE_CODE has various special-purpose
 816    fields as well.  The fields of a node are never accessed directly,
 817    always through accessor macros.  */
 818
 819 /* Every kind of tree node starts with this structure,
 820    so all nodes have these fields.
 821
 822    See the accessor macros, defined below, for documentation of the
 823    fields, and the table below which connects the fields and the
 824    accessor macros.  */
 825
 826 struct GTY(()) tree_base {
 827   ENUM_BITFIELD(tree_code) code : 16;
 828
 829   unsigned side_effects_flag : 1;
 830   unsigned constant_flag : 1;
 831   unsigned addressable_flag : 1;
 832   unsigned volatile_flag : 1;
 833   unsigned readonly_flag : 1;
 834   unsigned asm_written_flag: 1;
 835   unsigned nowarning_flag : 1;
 836   unsigned visited : 1;
 837
 838   unsigned used_flag : 1;
 839   unsigned nothrow_flag : 1;
 840   unsigned static_flag : 1;
 841   unsigned public_flag : 1;
 842   unsigned private_flag : 1;
 843   unsigned protected_flag : 1;
 844   unsigned deprecated_flag : 1;
 845   unsigned default_def_flag : 1;
 846
 847   union {
 848     /* The bits in the following structure should only be used with
 849        accessor macros that constrain inputs with tree checking.  */
 850     struct {
 851       unsigned lang_flag_0 : 1;
 852       unsigned lang_flag_1 : 1;
 853       unsigned lang_flag_2 : 1;
 854       unsigned lang_flag_3 : 1;
 855       unsigned lang_flag_4 : 1;
 856       unsigned lang_flag_5 : 1;
 857       unsigned lang_flag_6 : 1;
 858       unsigned saturating_flag : 1;
 859
 860       unsigned unsigned_flag : 1;
 861       unsigned packed_flag : 1;
 862       unsigned user_align : 1;
 863       unsigned nameless_flag : 1;
 864       unsigned atomic_flag : 1;
 865       unsigned spare0 : 3;
 866
 867       unsigned spare1 : 8;
 868
 869       /* This field is only used with TREE_TYPE nodes; the only reason it is
 870          present in tree_base instead of tree_type is to save space.  The size
 871          of the field must be large enough to hold addr_space_t values.  */
 872       unsigned address_space : 8;
 873     } bits;
 874
 875     /* The following fields are present in tree_base to save space.  The
 876        nodes using them do not require any of the flags above and so can
 877        make better use of the 4-byte sized word.  */
 878
 879     /* The number of HOST_WIDE_INTs in an INTEGER_CST.  */
 880     struct {
 881       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
 882          its native precision.  */
 883       unsigned char unextended;
 884
 885       /* The number of HOST_WIDE_INTs if the INTEGER_CST is extended to
 886          wider precisions based on its TYPE_SIGN.  */
 887       unsigned char extended;
 888
 889       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
 890          offset_int precision, with smaller integers being extended
 891          according to their TYPE_SIGN.  This is equal to one of the two
 892          fields above but is cached for speed.  */
 893       unsigned char offset;
 894     } int_length;
 895
 896     /* VEC length.  This field is only used with TREE_VEC.  */
 897     int length;
 898
 899     /* SSA version number.  This field is only used with SSA_NAME.  */
 900     unsigned int version;
 901
 902     /* Internal function code.  */
 903     enum internal_fn ifn;
 904
 905     /* The following two fields are used for MEM_REF and TARGET_MEM_REF
 906        expression trees and specify known data non-dependences.  For
 907        two memory references in a function they are known to not
 908        alias if dependence_info.clique are equal and dependence_info.base
 909        are distinct.  */
 910     struct {
 911       unsigned short clique;
 912       unsigned short base;
 913     } dependence_info;
 914   } GTY((skip(""))) u;
 915 };
 916
 917 /* The following table lists the uses of each of the above flags and
 918    for which types of nodes they are defined.
 919
 920    addressable_flag:
 921
 922        TREE_ADDRESSABLE in
 923            VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
 924            SSA_NAME
 925            all types
 926            CONSTRUCTOR, IDENTIFIER_NODE
 927            STMT_EXPR
 928
 929        CALL_EXPR_TAILCALL in
 930            CALL_EXPR
 931
 932        CASE_LOW_SEEN in
 933            CASE_LABEL_EXPR
 934
 935        PREDICT_EXPR_OUTCOME in
 936            PREDICT_EXPR
 937
 938    static_flag:
 939
 940        TREE_STATIC in
 941            VAR_DECL, FUNCTION_DECL
 942            CONSTRUCTOR
 943
 944        TREE_NO_TRAMPOLINE in
 945            ADDR_EXPR
 946
 947        BINFO_VIRTUAL_P in
 948            TREE_BINFO
 949
 950        TREE_SYMBOL_REFERENCED in
 951            IDENTIFIER_NODE
 952
 953        CLEANUP_EH_ONLY in
 954            TARGET_EXPR, WITH_CLEANUP_EXPR
 955
 956        TRY_CATCH_IS_CLEANUP in
 957            TRY_CATCH_EXPR
 958
 959        ASM_INPUT_P in
 960            ASM_EXPR
 961
 962        TYPE_REF_CAN_ALIAS_ALL in
 963            POINTER_TYPE, REFERENCE_TYPE
 964
 965        CASE_HIGH_SEEN in
 966            CASE_LABEL_EXPR
 967
 968        ENUM_IS_SCOPED in
 969            ENUMERAL_TYPE
 970
 971        TRANSACTION_EXPR_OUTER in
 972            TRANSACTION_EXPR
 973
 974        SSA_NAME_ANTI_RANGE_P in
 975            SSA_NAME
 976
 977    public_flag:
 978
 979        TREE_OVERFLOW in
 980            INTEGER_CST, REAL_CST, COMPLEX_CST, VECTOR_CST
 981
 982        TREE_PUBLIC in
 983            VAR_DECL, FUNCTION_DECL
 984            IDENTIFIER_NODE
 985
 986        CONSTRUCTOR_NO_CLEARING in
 987            CONSTRUCTOR
 988
 989        ASM_VOLATILE_P in
 990            ASM_EXPR
 991
 992        CALL_EXPR_VA_ARG_PACK in
 993            CALL_EXPR
 994
 995        TYPE_CACHED_VALUES_P in
 996            all types
 997
 998        SAVE_EXPR_RESOLVED_P in
 999            SAVE_EXPR
1000
1001        OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE in
1002            OMP_CLAUSE_LASTPRIVATE
1003
1004        OMP_CLAUSE_PRIVATE_DEBUG in
1005            OMP_CLAUSE_PRIVATE
1006
1007        OMP_CLAUSE_LINEAR_NO_COPYIN in
1008            OMP_CLAUSE_LINEAR
1009
1010        OMP_CLAUSE_MAP_ZERO_BIAS_ARRAY_SECTION in
1011            OMP_CLAUSE_MAP
1012
1013        OMP_CLAUSE_REDUCTION_OMP_ORIG_REF in
1014            OMP_CLAUSE_REDUCTION
1015
1016        TRANSACTION_EXPR_RELAXED in
1017            TRANSACTION_EXPR
1018
1019    private_flag:
1020
1021        TREE_PRIVATE in
1022            all decls
1023
1024        CALL_EXPR_RETURN_SLOT_OPT in
1025            CALL_EXPR
1026
1027        OMP_SECTION_LAST in
1028            OMP_SECTION
1029
1030        OMP_PARALLEL_COMBINED in
1031            OMP_PARALLEL
1032
1033        OMP_ATOMIC_SEQ_CST in
1034            OMP_ATOMIC*
1035
1036        OMP_CLAUSE_PRIVATE_OUTER_REF in
1037            OMP_CLAUSE_PRIVATE
1038
1039        OMP_CLAUSE_LINEAR_NO_COPYOUT in
1040            OMP_CLAUSE_LINEAR
1041
1042        TYPE_REF_IS_RVALUE in
1043            REFERENCE_TYPE
1044
1045        ENUM_IS_OPAQUE in
1046            ENUMERAL_TYPE
1047
1048    protected_flag:
1049
1050        TREE_PROTECTED in
1051            BLOCK
1052            all decls
1053
1054        CALL_FROM_THUNK_P and
1055        CALL_ALLOCA_FOR_VAR_P in
1056            CALL_EXPR
1057
1058        OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
1059            OMP_CLAUSE_LINEAR
1060
1061    side_effects_flag:
1062
1063        TREE_SIDE_EFFECTS in
1064            all expressions
1065            all decls
1066            all constants
1067
1068        FORCED_LABEL in
1069            LABEL_DECL
1070
1071    volatile_flag:
1072
1073        TREE_THIS_VOLATILE in
1074            all expressions
1075            all decls
1076
1077        TYPE_VOLATILE in
1078            all types
1079
1080    readonly_flag:
1081
1082        TREE_READONLY in
1083            all expressions
1084            all decls
1085
1086        TYPE_READONLY in
1087            all types
1088
1089    constant_flag:
1090
1091        TREE_CONSTANT in
1092            all expressions
1093            all decls
1094            all constants
1095
1096        TYPE_SIZES_GIMPLIFIED in
1097            all types
1098
1099    unsigned_flag:
1100
1101        TYPE_UNSIGNED in
1102            all types
1103
1104        DECL_UNSIGNED in
1105            all decls
1106
1107    asm_written_flag:
1108
1109        TREE_ASM_WRITTEN in
1110            VAR_DECL, FUNCTION_DECL, TYPE_DECL
1111            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE
1112            BLOCK, STRING_CST
1113
1114        SSA_NAME_OCCURS_IN_ABNORMAL_PHI in
1115            SSA_NAME
1116
1117    used_flag:
1118
1119        TREE_USED in
1120            all expressions
1121            all decls
1122            IDENTIFIER_NODE
1123
1124    nothrow_flag:
1125
1126        TREE_NOTHROW in
1127            CALL_EXPR
1128            FUNCTION_DECL
1129
1130        TYPE_ALIGN_OK in
1131            all types
1132
1133        TREE_THIS_NOTRAP in
1134           INDIRECT_REF, MEM_REF, TARGET_MEM_REF, ARRAY_REF, ARRAY_RANGE_REF
1135
1136        SSA_NAME_IN_FREE_LIST in
1137           SSA_NAME
1138
1139        DECL_NONALIASED in
1140           VAR_DECL
1141
1142    deprecated_flag:
1143
1144        TREE_DEPRECATED in
1145            all decls
1146            all types
1147
1148        IDENTIFIER_TRANSPARENT_ALIAS in
1149            IDENTIFIER_NODE
1150
1151    visited:
1152
1153        TREE_VISITED in
1154            all trees (used liberally by many passes)
1155
1156    saturating_flag:
1157
1158        TYPE_SATURATING in
1159            all types
1160
1161        VAR_DECL_IS_VIRTUAL_OPERAND in
1162            VAR_DECL
1163
1164    nowarning_flag:
1165
1166        TREE_NO_WARNING in
1167            all expressions
1168            all decls
1169
1170        TYPE_ARTIFICIAL in
1171            all types
1172
1173    default_def_flag:
1174
1175        TYPE_VECTOR_OPAQUE in
1176            VECTOR_TYPE
1177
1178        SSA_NAME_IS_DEFAULT_DEF in
1179            SSA_NAME
1180
1181        DECL_NONLOCAL_FRAME in
1182            VAR_DECL
1183
1184        TYPE_FINAL_P in
1185            RECORD_TYPE, UNION_TYPE and QUAL_UNION_TYPE
1186 */
1187
1188 struct GTY(()) tree_typed {
1189   struct tree_base base;
1190   tree type;
1191 };
1192
1193 struct GTY(()) tree_common {
1194   struct tree_typed typed;
1195   tree chain;
1196 };
1197
1198 struct GTY(()) tree_int_cst {
1199   struct tree_typed typed;
1200   HOST_WIDE_INT val[1];
1201 };
1202
1203
1204 struct GTY(()) tree_real_cst {
1205   struct tree_typed typed;
1206   struct real_value * real_cst_ptr;
1207 };
1208
1209 struct GTY(()) tree_fixed_cst {
1210   struct tree_typed typed;
1211   struct fixed_value * fixed_cst_ptr;
1212 };
1213
1214 struct GTY(()) tree_string {
1215   struct tree_typed typed;
1216   int length;
1217   char str[1];
1218 };
1219
1220 struct GTY(()) tree_complex {
1221   struct tree_typed typed;
1222   tree real;
1223   tree imag;
1224 };
1225
1226 struct GTY(()) tree_vector {
1227   struct tree_typed typed;
1228   tree GTY ((length ("TYPE_VECTOR_SUBPARTS (TREE_TYPE ((tree)&%h))"))) elts[1];
1229 };
1230
1231 struct GTY(()) tree_identifier {
1232   struct tree_common common;
1233   struct ht_identifier id;
1234 };
1235
1236 struct GTY(()) tree_list {
1237   struct tree_common common;
1238   tree purpose;
1239   tree value;
1240 };
1241
1242 struct GTY(()) tree_vec {
1243   struct tree_common common;
1244   tree GTY ((length ("TREE_VEC_LENGTH ((tree)&%h)"))) a[1];
1245 };
1246
1247 /* A single element of a CONSTRUCTOR. VALUE holds the actual value of the
1248    element. INDEX can optionally design the position of VALUE: in arrays,
1249    it is the index where VALUE has to be placed; in structures, it is the
1250    FIELD_DECL of the member.  */
1251 struct GTY(()) constructor_elt {
1252   tree index;
1253   tree value;
1254 };
1255
1256 struct GTY(()) tree_constructor {
1257   struct tree_typed typed;
1258   vec<constructor_elt, va_gc> *elts;
1259 };
1260
1261 enum omp_clause_depend_kind
1262 {
1263   OMP_CLAUSE_DEPEND_IN,
1264   OMP_CLAUSE_DEPEND_OUT,
1265   OMP_CLAUSE_DEPEND_INOUT,
1266   OMP_CLAUSE_DEPEND_SOURCE,
1267   OMP_CLAUSE_DEPEND_SINK,
1268   OMP_CLAUSE_DEPEND_LAST
1269 };
1270
1271 enum omp_clause_proc_bind_kind
1272 {
1273   /* Numbers should match omp_proc_bind_t enum in omp.h.  */
1274   OMP_CLAUSE_PROC_BIND_FALSE = 0,
1275   OMP_CLAUSE_PROC_BIND_TRUE = 1,
1276   OMP_CLAUSE_PROC_BIND_MASTER = 2,
1277   OMP_CLAUSE_PROC_BIND_CLOSE = 3,
1278   OMP_CLAUSE_PROC_BIND_SPREAD = 4,
1279   OMP_CLAUSE_PROC_BIND_LAST
1280 };
1281
1282 enum omp_clause_linear_kind
1283 {
1284   OMP_CLAUSE_LINEAR_DEFAULT,
1285   OMP_CLAUSE_LINEAR_REF,
1286   OMP_CLAUSE_LINEAR_VAL,
1287   OMP_CLAUSE_LINEAR_UVAL
1288 };
1289
1290 struct GTY(()) tree_exp {
1291   struct tree_typed typed;
1292   location_t locus;
1293   tree GTY ((special ("tree_exp"),
1294              desc ("TREE_CODE ((tree) &%0)")))
1295     operands[1];
1296 };
1297
1298 /* Immediate use linking structure.  This structure is used for maintaining
1299    a doubly linked list of uses of an SSA_NAME.  */
1300 struct GTY(()) ssa_use_operand_t {
1301   struct ssa_use_operand_t* GTY((skip(""))) prev;
1302   struct ssa_use_operand_t* GTY((skip(""))) next;
1303   /* Immediate uses for a given SSA name are maintained as a cyclic
1304      list.  To recognize the root of this list, the location field
1305      needs to point to the original SSA name.  Since statements and
1306      SSA names are of different data types, we need this union.  See
1307      the explanation in struct imm_use_iterator.  */
1308   union { gimple *stmt; tree ssa_name; } GTY((skip(""))) loc;
1309   tree *GTY((skip(""))) use;
1310 };
1311
1312 struct GTY(()) tree_ssa_name {
1313   struct tree_typed typed;
1314
1315   /* _DECL wrapped by this SSA name.  */
1316   tree var;
1317
1318   /* Statement that defines this SSA name.  */
1319   gimple *def_stmt;
1320
1321   /* Value range information.  */
1322   union ssa_name_info_type {
1323     /* Pointer attributes used for alias analysis.  */
1324     struct GTY ((tag ("0"))) ptr_info_def *ptr_info;
1325     /* Value range attributes used for zero/sign extension elimination.  */
1326     struct GTY ((tag ("1"))) range_info_def *range_info;
1327   } GTY ((desc ("%1.typed.type ?" \
1328                 "!POINTER_TYPE_P (TREE_TYPE ((tree)&%1)) : 2"))) info;
1329
1330   /* Immediate uses list for this SSA_NAME.  */
1331   struct ssa_use_operand_t imm_uses;
1332 };
1333
1334 struct GTY(()) phi_arg_d {
1335   /* imm_use MUST be the first element in struct because we do some
1336      pointer arithmetic with it.  See phi_arg_index_from_use.  */
1337   struct ssa_use_operand_t imm_use;
1338   tree def;
1339   location_t locus;
1340 };
1341
1342 struct GTY(()) tree_omp_clause {
1343   struct tree_common common;
1344   location_t locus;
1345   enum omp_clause_code code;
1346   union omp_clause_subcode {
1347     enum omp_clause_default_kind   default_kind;
1348     enum omp_clause_schedule_kind  schedule_kind;
1349     enum omp_clause_depend_kind    depend_kind;
1350     /* See include/gomp-constants.h for enum gomp_map_kind's values.  */
1351     unsigned int                   map_kind;
1352     enum omp_clause_proc_bind_kind proc_bind_kind;
1353     enum tree_code                 reduction_code;
1354     enum omp_clause_linear_kind    linear_kind;
1355     enum tree_code                 if_modifier;
1356   } GTY ((skip)) subcode;
1357
1358   /* The gimplification of OMP_CLAUSE_REDUCTION_{INIT,MERGE} for omp-low's
1359      usage.  */
1360   gimple_seq gimple_reduction_init;
1361   gimple_seq gimple_reduction_merge;
1362
1363   tree GTY ((length ("omp_clause_num_ops[OMP_CLAUSE_CODE ((tree)&%h)]")))
1364     ops[1];
1365 };
1366
1367 struct GTY(()) tree_block {
1368   struct tree_base base;
1369   tree chain;
1370
1371   unsigned abstract_flag : 1;
1372   unsigned block_num : 31;
1373
1374   location_t locus;
1375   location_t end_locus;
1376
1377   tree vars;
1378   vec<tree, va_gc> *nonlocalized_vars;
1379
1380   tree subblocks;
1381   tree supercontext;
1382   tree abstract_origin;
1383   tree fragment_origin;
1384   tree fragment_chain;
1385
1386   /* Pointer to the DWARF lexical block.  */
1387   struct die_struct *die;
1388 };
1389
1390 struct GTY(()) tree_type_common {
1391   struct tree_common common;
1392   tree size;
1393   tree size_unit;
1394   tree attributes;
1395   unsigned int uid;
1396
1397   unsigned int precision : 10;
1398   unsigned no_force_blk_flag : 1;
1399   unsigned needs_constructing_flag : 1;
1400   unsigned transparent_aggr_flag : 1;
1401   unsigned restrict_flag : 1;
1402   unsigned contains_placeholder_bits : 2;
1403
1404   ENUM_BITFIELD(machine_mode) mode : 8;
1405
1406   unsigned string_flag : 1;
1407   unsigned lang_flag_0 : 1;
1408   unsigned lang_flag_1 : 1;
1409   unsigned lang_flag_2 : 1;
1410   unsigned lang_flag_3 : 1;
1411   unsigned lang_flag_4 : 1;
1412   unsigned lang_flag_5 : 1;
1413   unsigned lang_flag_6 : 1;
1414
1415   unsigned int align;
1416   alias_set_type alias_set;
1417   tree pointer_to;
1418   tree reference_to;
1419   union tree_type_symtab {
1420     int GTY ((tag ("TYPE_SYMTAB_IS_ADDRESS"))) address;
1421     const char * GTY ((tag ("TYPE_SYMTAB_IS_POINTER"))) pointer;
1422     struct die_struct * GTY ((tag ("TYPE_SYMTAB_IS_DIE"))) die;
1423   } GTY ((desc ("debug_hooks->tree_type_symtab_field"))) symtab;
1424   tree canonical;
1425   tree next_variant;
1426   tree main_variant;
1427   tree context;
1428   tree name;
1429 };
1430
1431 struct GTY(()) tree_type_with_lang_specific {
1432   struct tree_type_common common;
1433   /* Points to a structure whose details depend on the language in use.  */
1434   struct lang_type *lang_specific;
1435 };
1436
1437 struct GTY(()) tree_type_non_common {
1438   struct tree_type_with_lang_specific with_lang_specific;
1439   tree values;
1440   tree minval;
1441   tree maxval;
1442   tree binfo;
1443 };
1444
1445 struct GTY (()) tree_binfo {
1446   struct tree_common common;
1447
1448   tree offset;
1449   tree vtable;
1450   tree virtuals;
1451   tree vptr_field;
1452   vec<tree, va_gc> *base_accesses;
1453   tree inheritance;
1454
1455   tree vtt_subvtt;
1456   tree vtt_vptr;
1457
1458   vec<tree, va_gc> base_binfos;
1459 };
1460
1461 struct GTY(()) tree_decl_minimal {
1462   struct tree_common common;
1463   location_t locus;
1464   unsigned int uid;
1465   tree name;
1466   tree context;
1467 };
1468
1469 struct GTY(()) tree_decl_common {
1470   struct tree_decl_minimal common;
1471   tree size;
1472
1473   ENUM_BITFIELD(machine_mode) mode : 8;
1474
1475   unsigned nonlocal_flag : 1;
1476   unsigned virtual_flag : 1;
1477   unsigned ignored_flag : 1;
1478   unsigned abstract_flag : 1;
1479   unsigned artificial_flag : 1;
1480   unsigned preserve_flag: 1;
1481   unsigned debug_expr_is_from : 1;
1482
1483   unsigned lang_flag_0 : 1;
1484   unsigned lang_flag_1 : 1;
1485   unsigned lang_flag_2 : 1;
1486   unsigned lang_flag_3 : 1;
1487   unsigned lang_flag_4 : 1;
1488   unsigned lang_flag_5 : 1;
1489   unsigned lang_flag_6 : 1;
1490   unsigned lang_flag_7 : 1;
1491   unsigned lang_flag_8 : 1;
1492
1493   /* In VAR_DECL and PARM_DECL, this is DECL_REGISTER.  */
1494   unsigned decl_flag_0 : 1;
1495   /* In FIELD_DECL, this is DECL_BIT_FIELD
1496      In VAR_DECL and FUNCTION_DECL, this is DECL_EXTERNAL.
1497      In TYPE_DECL, this is TYPE_DECL_SUPPRESS_DEBUG.  */
1498   unsigned decl_flag_1 : 1;
1499   /* In FIELD_DECL, this is DECL_NONADDRESSABLE_P
1500      In VAR_DECL, PARM_DECL and RESULT_DECL, this is
1501      DECL_HAS_VALUE_EXPR_P.  */
1502   unsigned decl_flag_2 : 1;
1503   /* 1 bit unused.  */
1504   unsigned decl_flag_3 : 1;
1505   /* Logically, these two would go in a theoretical base shared by var and
1506      parm decl. */
1507   unsigned gimple_reg_flag : 1;
1508   /* In VAR_DECL, PARM_DECL and RESULT_DECL, this is DECL_BY_REFERENCE.  */
1509   unsigned decl_by_reference_flag : 1;
1510   /* In a VAR_DECL and PARM_DECL, this is DECL_READ_P.  */
1511   unsigned decl_read_flag : 1;
1512   /* In a VAR_DECL or RESULT_DECL, this is DECL_NONSHAREABLE.  */
1513   unsigned decl_nonshareable_flag : 1;
1514
1515   /* DECL_OFFSET_ALIGN, used only for FIELD_DECLs.  */
1516   unsigned int off_align : 8;
1517
1518   /* 24 bits unused.  */
1519
1520   /* DECL_ALIGN.  It should have the same size as TYPE_ALIGN.  */
1521   unsigned int align;
1522
1523   /* UID for points-to sets, stable over copying from inlining.  */
1524   unsigned int pt_uid;
1525
1526   tree size_unit;
1527   tree initial;
1528   tree attributes;
1529   tree abstract_origin;
1530
1531   /* Points to a structure whose details depend on the language in use.  */
1532   struct lang_decl *lang_specific;
1533 };
1534
1535 struct GTY(()) tree_decl_with_rtl {
1536   struct tree_decl_common common;
1537   rtx rtl;
1538 };
1539
1540 struct GTY(()) tree_field_decl {
1541   struct tree_decl_common common;
1542
1543   tree offset;
1544   tree bit_field_type;
1545   tree qualifier;
1546   tree bit_offset;
1547   tree fcontext;
1548 };
1549
1550 struct GTY(()) tree_label_decl {
1551   struct tree_decl_with_rtl common;
1552   int label_decl_uid;
1553   int eh_landing_pad_nr;
1554 };
1555
1556 struct GTY(()) tree_result_decl {
1557   struct tree_decl_with_rtl common;
1558 };
1559
1560 struct GTY(()) tree_const_decl {
1561   struct tree_decl_common common;
1562 };
1563
1564 struct GTY(()) tree_parm_decl {
1565   struct tree_decl_with_rtl common;
1566   rtx incoming_rtl;
1567 };
1568
1569 struct GTY(()) tree_decl_with_vis {
1570  struct tree_decl_with_rtl common;
1571  tree assembler_name;
1572  struct symtab_node *symtab_node;
1573
1574  /* Belong to VAR_DECL exclusively.  */
1575  unsigned defer_output : 1;
1576  unsigned hard_register : 1;
1577  unsigned common_flag : 1;
1578  unsigned in_text_section : 1;
1579  unsigned in_constant_pool : 1;
1580  unsigned dllimport_flag : 1;
1581  /* Don't belong to VAR_DECL exclusively.  */
1582  unsigned weak_flag : 1;
1583
1584  unsigned seen_in_bind_expr : 1;
1585  unsigned comdat_flag : 1;
1586  /* Used for FUNCTION_DECL, VAR_DECL and in C++ for TYPE_DECL.  */
1587  ENUM_BITFIELD(symbol_visibility) visibility : 2;
1588  unsigned visibility_specified : 1;
1589
1590  /* Belong to FUNCTION_DECL exclusively.  */
1591  unsigned init_priority_p : 1;
1592  /* Used by C++ only.  Might become a generic decl flag.  */
1593  unsigned shadowed_for_var_p : 1;
1594  /* Belong to FUNCTION_DECL exclusively.  */
1595  unsigned cxx_constructor : 1;
1596  /* Belong to FUNCTION_DECL exclusively.  */
1597  unsigned cxx_destructor : 1;
1598  /* Belong to FUNCTION_DECL exclusively.  */
1599  unsigned final : 1;
1600  /* Belong to FUNCTION_DECL exclusively.  */
1601  unsigned regdecl_flag : 1;
1602  /* 14 unused bits. */
1603 };
1604
1605 struct GTY(()) tree_var_decl {
1606   struct tree_decl_with_vis common;
1607 };
1608
1609 struct GTY(()) tree_decl_non_common {
1610   struct tree_decl_with_vis common;
1611   /* Almost all FE's use this.  */
1612   tree result;
1613 };
1614
1615 /* FUNCTION_DECL inherits from DECL_NON_COMMON because of the use of the
1616    arguments/result/saved_tree fields by front ends.   It was either inherit
1617    FUNCTION_DECL from non_common, or inherit non_common from FUNCTION_DECL,
1618    which seemed a bit strange.  */
1619
1620 struct GTY(()) tree_function_decl {
1621   struct tree_decl_non_common common;
1622
1623   struct function *f;
1624
1625   /* Arguments of the function.  */
1626   tree arguments;
1627   /* The personality function. Used for stack unwinding. */
1628   tree personality;
1629
1630   /* Function specific options that are used by this function.  */
1631   tree function_specific_target;        /* target options */
1632   tree function_specific_optimization;  /* optimization options */
1633
1634   /* Generic function body.  */
1635   tree saved_tree;
1636   /* Index within a virtual table.  */
1637   tree vindex;
1638
1639   /* In a FUNCTION_DECL for which DECL_BUILT_IN holds, this is
1640      DECL_FUNCTION_CODE.  Otherwise unused.
1641      ???  The bitfield needs to be able to hold all target function
1642           codes as well.  */
1643   ENUM_BITFIELD(built_in_function) function_code : 12;
1644   ENUM_BITFIELD(built_in_class) built_in_class : 2;
1645
1646   unsigned static_ctor_flag : 1;
1647   unsigned static_dtor_flag : 1;
1648
1649   unsigned uninlinable : 1;
1650   unsigned possibly_inlined : 1;
1651   unsigned novops_flag : 1;
1652   unsigned returns_twice_flag : 1;
1653   unsigned malloc_flag : 1;
1654   unsigned operator_new_flag : 1;
1655   unsigned declared_inline_flag : 1;
1656   unsigned no_inline_warning_flag : 1;
1657
1658   unsigned no_instrument_function_entry_exit : 1;
1659   unsigned no_limit_stack : 1;
1660   unsigned disregard_inline_limits : 1;
1661   unsigned pure_flag : 1;
1662   unsigned looping_const_or_pure_flag : 1;
1663   unsigned has_debug_args_flag : 1;
1664   unsigned tm_clone_flag : 1;
1665   unsigned versioned_function : 1;
1666   /* No bits left.  */
1667 };
1668
1669 struct GTY(()) tree_translation_unit_decl {
1670   struct tree_decl_common common;
1671   /* Source language of this translation unit.  Used for DWARF output.  */
1672   const char * GTY((skip(""))) language;
1673   /* TODO: Non-optimization used to build this translation unit.  */
1674   /* TODO: Root of a partial DWARF tree for global types and decls.  */
1675 };
1676
1677 struct GTY(()) tree_type_decl {
1678   struct tree_decl_non_common common;
1679
1680 };
1681
1682 struct GTY ((chain_next ("%h.next"), chain_prev ("%h.prev"))) tree_statement_list_node
1683  {
1684   struct tree_statement_list_node *prev;
1685   struct tree_statement_list_node *next;
1686   tree stmt;
1687 };
1688
1689 struct GTY(()) tree_statement_list
1690  {
1691   struct tree_typed typed;
1692   struct tree_statement_list_node *head;
1693   struct tree_statement_list_node *tail;
1694 };
1695
1696
1697 /* Optimization options used by a function.  */
1698
1699 struct GTY(()) tree_optimization_option {
1700   struct tree_common common;
1701
1702   /* The optimization options used by the user.  */
1703   struct cl_optimization *opts;
1704
1705   /* Target optabs for this set of optimization options.  This is of
1706      type `struct target_optabs *'.  */
1707   void *GTY ((atomic)) optabs;
1708
1709   /* The value of this_target_optabs against which the optabs above were
1710      generated.  */
1711   struct target_optabs *GTY ((skip)) base_optabs;
1712 };
1713
1714 /* Forward declaration, defined in target-globals.h.  */
1715
1716 struct GTY(()) target_globals;
1717
1718 /* Target options used by a function.  */
1719
1720 struct GTY(()) tree_target_option {
1721   struct tree_common common;
1722
1723   /* Target globals for the corresponding target option.  */
1724   struct target_globals *globals;
1725
1726   /* The optimization options used by the user.  */
1727   struct cl_target_option *opts;
1728 };
1729
1730 /* Define the overall contents of a tree node.
1731    It may be any of the structures declared above
1732    for various types of node.  */
1733 union GTY ((ptr_alias (union lang_tree_node),
1734             desc ("tree_node_structure (&%h)"), variable_size)) tree_node {
1735   struct tree_base GTY ((tag ("TS_BASE"))) base;
1736   struct tree_typed GTY ((tag ("TS_TYPED"))) typed;
1737   struct tree_common GTY ((tag ("TS_COMMON"))) common;
1738   struct tree_int_cst GTY ((tag ("TS_INT_CST"))) int_cst;
1739   struct tree_real_cst GTY ((tag ("TS_REAL_CST"))) real_cst;
1740   struct tree_fixed_cst GTY ((tag ("TS_FIXED_CST"))) fixed_cst;
1741   struct tree_vector GTY ((tag ("TS_VECTOR"))) vector;
1742   struct tree_string GTY ((tag ("TS_STRING"))) string;
1743   struct tree_complex GTY ((tag ("TS_COMPLEX"))) complex;
1744   struct tree_identifier GTY ((tag ("TS_IDENTIFIER"))) identifier;
1745   struct tree_decl_minimal GTY((tag ("TS_DECL_MINIMAL"))) decl_minimal;
1746   struct tree_decl_common GTY ((tag ("TS_DECL_COMMON"))) decl_common;
1747   struct tree_decl_with_rtl GTY ((tag ("TS_DECL_WRTL"))) decl_with_rtl;
1748   struct tree_decl_non_common  GTY ((tag ("TS_DECL_NON_COMMON")))
1749     decl_non_common;
1750   struct tree_parm_decl  GTY  ((tag ("TS_PARM_DECL"))) parm_decl;
1751   struct tree_decl_with_vis GTY ((tag ("TS_DECL_WITH_VIS"))) decl_with_vis;
1752   struct tree_var_decl GTY ((tag ("TS_VAR_DECL"))) var_decl;
1753   struct tree_field_decl GTY ((tag ("TS_FIELD_DECL"))) field_decl;
1754   struct tree_label_decl GTY ((tag ("TS_LABEL_DECL"))) label_decl;
1755   struct tree_result_decl GTY ((tag ("TS_RESULT_DECL"))) result_decl;
1756   struct tree_const_decl GTY ((tag ("TS_CONST_DECL"))) const_decl;
1757   struct tree_type_decl GTY ((tag ("TS_TYPE_DECL"))) type_decl;
1758   struct tree_function_decl GTY ((tag ("TS_FUNCTION_DECL"))) function_decl;
1759   struct tree_translation_unit_decl GTY ((tag ("TS_TRANSLATION_UNIT_DECL")))
1760     translation_unit_decl;
1761   struct tree_type_common GTY ((tag ("TS_TYPE_COMMON"))) type_common;
1762   struct tree_type_with_lang_specific GTY ((tag ("TS_TYPE_WITH_LANG_SPECIFIC")))
1763     type_with_lang_specific;
1764   struct tree_type_non_common GTY ((tag ("TS_TYPE_NON_COMMON")))
1765     type_non_common;
1766   struct tree_list GTY ((tag ("TS_LIST"))) list;
1767   struct tree_vec GTY ((tag ("TS_VEC"))) vec;
1768   struct tree_exp GTY ((tag ("TS_EXP"))) exp;
1769   struct tree_ssa_name GTY ((tag ("TS_SSA_NAME"))) ssa_name;
1770   struct tree_block GTY ((tag ("TS_BLOCK"))) block;
1771   struct tree_binfo GTY ((tag ("TS_BINFO"))) binfo;
1772   struct tree_statement_list GTY ((tag ("TS_STATEMENT_LIST"))) stmt_list;
1773   struct tree_constructor GTY ((tag ("TS_CONSTRUCTOR"))) constructor;
1774   struct tree_omp_clause GTY ((tag ("TS_OMP_CLAUSE"))) omp_clause;
1775   struct tree_optimization_option GTY ((tag ("TS_OPTIMIZATION"))) optimization;
1776   struct tree_target_option GTY ((tag ("TS_TARGET_OPTION"))) target_option;
1777 };
1778
1779 /* Structure describing an attribute and a function to handle it.  */
1780 struct attribute_spec {
1781   /* The name of the attribute (without any leading or trailing __),
1782      or NULL to mark the end of a table of attributes.  */
1783   const char *name;
1784   /* The minimum length of the list of arguments of the attribute.  */
1785   int min_length;
1786   /* The maximum length of the list of arguments of the attribute
1787      (-1 for no maximum).  */
1788   int max_length;
1789   /* Whether this attribute requires a DECL.  If it does, it will be passed
1790      from types of DECLs, function return types and array element types to
1791      the DECLs, function types and array types respectively; but when
1792      applied to a type in any other circumstances, it will be ignored with
1793      a warning.  (If greater control is desired for a given attribute,
1794      this should be false, and the flags argument to the handler may be
1795      used to gain greater control in that case.)  */
1796   bool decl_required;
1797   /* Whether this attribute requires a type.  If it does, it will be passed
1798      from a DECL to the type of that DECL.  */
1799   bool type_required;
1800   /* Whether this attribute requires a function (or method) type.  If it does,
1801      it will be passed from a function pointer type to the target type,
1802      and from a function return type (which is not itself a function
1803      pointer type) to the function type.  */
1804   bool function_type_required;
1805   /* Function to handle this attribute.  NODE points to the node to which
1806      the attribute is to be applied.  If a DECL, it should be modified in
1807      place; if a TYPE, a copy should be created.  NAME is the name of the
1808      attribute (possibly with leading or trailing __).  ARGS is the TREE_LIST
1809      of the arguments (which may be NULL).  FLAGS gives further information
1810      about the context of the attribute.  Afterwards, the attributes will
1811      be added to the DECL_ATTRIBUTES or TYPE_ATTRIBUTES, as appropriate,
1812      unless *NO_ADD_ATTRS is set to true (which should be done on error,
1813      as well as in any other cases when the attributes should not be added
1814      to the DECL or TYPE).  Depending on FLAGS, any attributes to be
1815      applied to another type or DECL later may be returned;
1816      otherwise the return value should be NULL_TREE.  This pointer may be
1817      NULL if no special handling is required beyond the checks implied
1818      by the rest of this structure.  */
1819   tree (*handler) (tree *node, tree name, tree args,
1820                    int flags, bool *no_add_attrs);
1821   /* Specifies if attribute affects type's identity.  */
1822   bool affects_type_identity;
1823 };
1824
1825 /* These functions allow a front-end to perform a manual layout of a
1826    RECORD_TYPE.  (For instance, if the placement of subsequent fields
1827    depends on the placement of fields so far.)  Begin by calling
1828    start_record_layout.  Then, call place_field for each of the
1829    fields.  Then, call finish_record_layout.  See layout_type for the
1830    default way in which these functions are used.  */
1831 typedef struct record_layout_info_s {
1832   /* The RECORD_TYPE that we are laying out.  */
1833   tree t;
1834   /* The offset into the record so far, in bytes, not including bits in
1835      BITPOS.  */
1836   tree offset;
1837   /* The last known alignment of SIZE.  */
1838   unsigned int offset_align;
1839   /* The bit position within the last OFFSET_ALIGN bits, in bits.  */
1840   tree bitpos;
1841   /* The alignment of the record so far, in bits.  */
1842   unsigned int record_align;
1843   /* The alignment of the record so far, ignoring #pragma pack and
1844      __attribute__ ((packed)), in bits.  */
1845   unsigned int unpacked_align;
1846   /* The previous field laid out.  */
1847   tree prev_field;
1848   /* The static variables (i.e., class variables, as opposed to
1849      instance variables) encountered in T.  */
1850   vec<tree, va_gc> *pending_statics;
1851   /* Bits remaining in the current alignment group */
1852   int remaining_in_alignment;
1853   /* True if we've seen a packed field that didn't have normal
1854      alignment anyway.  */
1855   int packed_maybe_necessary;
1856 } *record_layout_info;
1857
1858 /* Iterator for going through the function arguments.  */
1859 struct function_args_iterator {
1860   tree next;                    /* TREE_LIST pointing to the next argument */
1861 };
1862
1863 /* Structures to map from a tree to another tree.  */
1864 struct GTY(()) tree_map_base {
1865   tree from;
1866 };
1867
1868 /* Map from a tree to another tree.  */
1869
1870 struct GTY((for_user)) tree_map {
1871   struct tree_map_base base;
1872   unsigned int hash;
1873   tree to;
1874 };
1875
1876 /* Map from a decl tree to another tree.  */
1877 struct GTY((for_user)) tree_decl_map {
1878   struct tree_map_base base;
1879   tree to;
1880 };
1881
1882 /* Map from a tree to an int.  */
1883 struct GTY((for_user)) tree_int_map {
1884   struct tree_map_base base;
1885   unsigned int to;
1886 };
1887
1888 /* Map from a decl tree to a tree vector.  */
1889 struct GTY((for_user)) tree_vec_map {
1890   struct tree_map_base base;
1891   vec<tree, va_gc> *to;
1892 };
1893
1894 /* Abstract iterators for CALL_EXPRs.  These static inline definitions
1895    have to go towards the end of tree.h so that union tree_node is fully
1896    defined by this point.  */
1897
1898 /* Structure containing iterator state.  */
1899 struct call_expr_arg_iterator {
1900   tree t;       /* the call_expr */
1901   int n;        /* argument count */
1902   int i;        /* next argument index */
1903 };
1904
1905 struct const_call_expr_arg_iterator {
1906   const_tree t; /* the call_expr */
1907   int n;        /* argument count */
1908   int i;        /* next argument index */
1909 };
1910
1911 /* The builtin_info structure holds the FUNCTION_DECL of the standard builtin
1912    function, and flags.  */
1913 struct GTY(()) builtin_info_type {
1914   tree decl;
1915   /* Whether the user can use <xxx> instead of explicitly using calls
1916      to __builtin_<xxx>.  */
1917   unsigned implicit_p : 1;
1918   /* Whether the user has provided a declaration of <xxx>.  */
1919   unsigned declared_p : 1;
1920 };
1921
1922
1923 /*---------------------------------------------------------------------------
1924                                 Global variables
1925 ---------------------------------------------------------------------------*/
1926 /* Matrix describing the structures contained in a given tree code.  */
1927 extern unsigned char tree_contains_struct[MAX_TREE_CODES][64];
1928
1929 /* Class of tree given its code.  */
1930 extern const enum tree_code_class tree_code_type[];
1931
1932 /* Each tree code class has an associated string representation.
1933    These must correspond to the tree_code_class entries.  */
1934 extern const char *const tree_code_class_strings[];
1935
1936 /* Number of argument-words in each kind of tree-node.  */
1937 extern const unsigned char tree_code_length[];
1938
1939 /* Vector of all alias pairs for global symbols.  */
1940 extern GTY(()) vec<alias_pair, va_gc> *alias_pairs;
1941
1942 /* Names of all the built_in classes.  */
1943 extern const char *const built_in_class_names[BUILT_IN_LAST];
1944
1945 /* Names of all the built_in functions.  */
1946 extern const char * built_in_names[(int) END_BUILTINS];
1947
1948 /* Number of operands and names for each OMP_CLAUSE node.  */
1949 extern unsigned const char omp_clause_num_ops[];
1950 extern const char * const omp_clause_code_name[];
1951
1952 /* A vector of all translation-units.  */
1953 extern GTY (()) vec<tree, va_gc> *all_translation_units;
1954
1955 /* Vector of standard trees used by the C compiler.  */
1956 extern GTY(()) tree global_trees[TI_MAX];
1957
1958 /* The standard C integer types.  Use integer_type_kind to index into
1959    this array.  */
1960 extern GTY(()) tree integer_types[itk_none];
1961
1962 /* Types used to represent sizes.  */
1963 extern GTY(()) tree sizetype_tab[(int) stk_type_kind_last];
1964
1965 /* Arrays for keeping track of tree node statistics.  */
1966 extern int tree_node_counts[];
1967 extern int tree_node_sizes[];
1968
1969 /* True if we are in gimple form and the actions of the folders need to
1970    be restricted.  False if we are not in gimple form and folding is not
1971    restricted to creating gimple expressions.  */
1972 extern bool in_gimple_form;
1973
1974 /* Functional interface to the builtin functions.  */
1975 extern GTY(()) builtin_info_type builtin_info[(int)END_BUILTINS];
1976
1977 /* If nonzero, an upper limit on alignment of structure fields, in bits,  */
1978 extern unsigned int maximum_field_alignment;
1979
1980 /* Points to the FUNCTION_DECL of the function whose body we are reading.  */
1981 extern GTY(()) tree current_function_decl;
1982
1983 /* Nonzero means a FUNC_BEGIN label was emitted.  */
1984 extern GTY(()) const char * current_function_func_begin_label;
1985
1986 #endif  // GCC_TREE_CORE_H