gcc/tree-core.h

   1 /* Core data structures for the 'tree' type.
   2    Copyright (C) 1989-2016 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 returns its first argument.  */
  85 #define ECF_RET1                  (1 << 11)
  86
  87 /* Nonzero if this call does not affect transactions.  */
  88 #define ECF_TM_PURE               (1 << 12)
  89
  90 /* Nonzero if this call is into the transaction runtime library.  */
  91 #define ECF_TM_BUILTIN            (1 << 13)
  92
  93 /* Nonzero if this is an indirect call by descriptor.  */
  94 #define ECF_BY_DESCRIPTOR         (1 << 14)
  95
  96 /* Call argument flags.  */
  97 /* Nonzero if the argument is not dereferenced recursively, thus only
  98    directly reachable memory is read or written.  */
  99 #define EAF_DIRECT              (1 << 0)
 100
 101 /* Nonzero if memory reached by the argument is not clobbered.  */
 102 #define EAF_NOCLOBBER           (1 << 1)
 103
 104 /* Nonzero if the argument does not escape.  */
 105 #define EAF_NOESCAPE            (1 << 2)
 106
 107 /* Nonzero if the argument is not used by the function.  */
 108 #define EAF_UNUSED              (1 << 3)
 109
 110 /* Call return flags.  */
 111 /* Mask for the argument number that is returned.  Lower two bits of
 112    the return flags, encodes argument slots zero to three.  */
 113 #define ERF_RETURN_ARG_MASK     (3)
 114
 115 /* Nonzero if the return value is equal to the argument number
 116    flags & ERF_RETURN_ARG_MASK.  */
 117 #define ERF_RETURNS_ARG         (1 << 2)
 118
 119 /* Nonzero if the return value does not alias with anything.  Functions
 120    with the malloc attribute have this set on their return value.  */
 121 #define ERF_NOALIAS             (1 << 3)
 122
 123
 124 /*---------------------------------------------------------------------------
 125                                   Enumerations
 126 ---------------------------------------------------------------------------*/
 127 /* Codes of tree nodes.  */
 128 #define DEFTREECODE(SYM, STRING, TYPE, NARGS)   SYM,
 129 #define END_OF_BASE_TREE_CODES LAST_AND_UNUSED_TREE_CODE,
 130
 131 enum tree_code {
 132 #include "all-tree.def"
 133 MAX_TREE_CODES
 134 };
 135
 136 #undef DEFTREECODE
 137 #undef END_OF_BASE_TREE_CODES
 138
 139 /* Number of language-independent tree codes.  */
 140 #define NUM_TREE_CODES \
 141   ((int) LAST_AND_UNUSED_TREE_CODE)
 142
 143 #define CODE_CONTAINS_STRUCT(CODE, STRUCT) \
 144   (tree_contains_struct[(CODE)][(STRUCT)])
 145
 146
 147 /* Classify which part of the compiler has defined a given builtin function.
 148    Note that we assume below that this is no more than two bits.  */
 149 enum built_in_class {
 150   NOT_BUILT_IN = 0,
 151   BUILT_IN_FRONTEND,
 152   BUILT_IN_MD,
 153   BUILT_IN_NORMAL
 154 };
 155
 156 /* Last marker used for LTO stremaing of built_in_class.  We can not add it
 157    to the enum since we need the enumb to fit in 2 bits.  */
 158 #define BUILT_IN_LAST (BUILT_IN_NORMAL + 1)
 159
 160 /* Codes that identify the various built in functions
 161    so that expand_call can identify them quickly.  */
 162 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) ENUM,
 163 enum built_in_function {
 164 #include "builtins.def"
 165
 166   BEGIN_CHKP_BUILTINS,
 167
 168 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND)
 169 #define DEF_BUILTIN_CHKP(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) \
 170   ENUM##_CHKP = ENUM + BEGIN_CHKP_BUILTINS + 1,
 171 #include "builtins.def"
 172
 173   END_CHKP_BUILTINS = BEGIN_CHKP_BUILTINS * 2 + 1,
 174
 175   /* Complex division routines in libgcc.  These are done via builtins
 176      because emit_library_call_value can't handle complex values.  */
 177   BUILT_IN_COMPLEX_MUL_MIN,
 178   BUILT_IN_COMPLEX_MUL_MAX
 179     = BUILT_IN_COMPLEX_MUL_MIN
 180       + MAX_MODE_COMPLEX_FLOAT
 181       - MIN_MODE_COMPLEX_FLOAT,
 182
 183   BUILT_IN_COMPLEX_DIV_MIN,
 184   BUILT_IN_COMPLEX_DIV_MAX
 185     = BUILT_IN_COMPLEX_DIV_MIN
 186       + MAX_MODE_COMPLEX_FLOAT
 187       - MIN_MODE_COMPLEX_FLOAT,
 188
 189   /* Upper bound on non-language-specific builtins.  */
 190   END_BUILTINS
 191 };
 192
 193 /* Internal functions.  */
 194 enum internal_fn {
 195 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) IFN_##CODE,
 196 #include "internal-fn.def"
 197   IFN_LAST
 198 };
 199
 200 /* An enum that combines target-independent built-in functions with
 201    internal functions, so that they can be treated in a similar way.
 202    The numbers for built-in functions are the same as for the
 203    built_in_function enum.  The numbers for internal functions
 204    start at END_BUITLINS.  */
 205 enum combined_fn {
 206 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) \
 207   CFN_##ENUM = int (ENUM),
 208 #include "builtins.def"
 209
 210 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND)
 211 #define DEF_BUILTIN_CHKP(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) \
 212   CFN_##ENUM##_CHKP = int (ENUM##_CHKP),
 213 #include "builtins.def"
 214
 215 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) \
 216   CFN_##CODE = int (END_BUILTINS) + int (IFN_##CODE),
 217 #include "internal-fn.def"
 218
 219   CFN_LAST
 220 };
 221
 222 /* Tree code classes.  Each tree_code has an associated code class
 223    represented by a TREE_CODE_CLASS.  */
 224 enum tree_code_class {
 225   tcc_exceptional, /* An exceptional code (fits no category).  */
 226   tcc_constant,    /* A constant.  */
 227   /* Order of tcc_type and tcc_declaration is important.  */
 228   tcc_type,        /* A type object code.  */
 229   tcc_declaration, /* A declaration (also serving as variable refs).  */
 230   tcc_reference,   /* A reference to storage.  */
 231   tcc_comparison,  /* A comparison expression.  */
 232   tcc_unary,       /* A unary arithmetic expression.  */
 233   tcc_binary,      /* A binary arithmetic expression.  */
 234   tcc_statement,   /* A statement expression, which have side effects
 235                       but usually no interesting value.  */
 236   tcc_vl_exp,      /* A function call or other expression with a
 237                       variable-length operand vector.  */
 238   tcc_expression   /* Any other expression.  */
 239 };
 240
 241 /* OMP_CLAUSE codes.  Do not reorder, as this is used to index into
 242    the tables omp_clause_num_ops and omp_clause_code_name.  */
 243 enum omp_clause_code {
 244   /* Clause zero is special-cased inside the parser
 245      (c_parser_omp_variable_list).  */
 246   OMP_CLAUSE_ERROR = 0,
 247
 248   /* OpenACC/OpenMP clause: private (variable_list).  */
 249   OMP_CLAUSE_PRIVATE,
 250
 251   /* OpenMP clause: shared (variable_list).  */
 252   OMP_CLAUSE_SHARED,
 253
 254   /* OpenACC/OpenMP clause: firstprivate (variable_list).  */
 255   OMP_CLAUSE_FIRSTPRIVATE,
 256
 257   /* OpenMP clause: lastprivate (variable_list).  */
 258   OMP_CLAUSE_LASTPRIVATE,
 259
 260   /* OpenACC/OpenMP clause: reduction (operator:variable_list).
 261      OMP_CLAUSE_REDUCTION_CODE: The tree_code of the operator.
 262      Operand 1: OMP_CLAUSE_REDUCTION_INIT: Stmt-list to initialize the var.
 263      Operand 2: OMP_CLAUSE_REDUCTION_MERGE: Stmt-list to merge private var
 264                 into the shared one.
 265      Operand 3: OMP_CLAUSE_REDUCTION_PLACEHOLDER: A dummy VAR_DECL
 266                 placeholder used in OMP_CLAUSE_REDUCTION_{INIT,MERGE}.
 267      Operand 4: OMP_CLAUSE_REDUCTION_DECL_PLACEHOLDER: Another dummy
 268                 VAR_DECL placeholder, used like the above for C/C++ array
 269                 reductions.  */
 270   OMP_CLAUSE_REDUCTION,
 271
 272   /* OpenMP clause: copyin (variable_list).  */
 273   OMP_CLAUSE_COPYIN,
 274
 275   /* OpenMP clause: copyprivate (variable_list).  */
 276   OMP_CLAUSE_COPYPRIVATE,
 277
 278   /* OpenMP clause: linear (variable-list[:linear-step]).  */
 279   OMP_CLAUSE_LINEAR,
 280
 281   /* OpenMP clause: aligned (variable-list[:alignment]).  */
 282   OMP_CLAUSE_ALIGNED,
 283
 284   /* OpenMP clause: depend ({in,out,inout}:variable-list).  */
 285   OMP_CLAUSE_DEPEND,
 286
 287   /* OpenMP clause: uniform (argument-list).  */
 288   OMP_CLAUSE_UNIFORM,
 289
 290   /* OpenMP clause: to (extended-list).
 291      Only when it appears in declare target.  */
 292   OMP_CLAUSE_TO_DECLARE,
 293
 294   /* OpenMP clause: link (variable-list).  */
 295   OMP_CLAUSE_LINK,
 296
 297   /* OpenMP clause: from (variable-list).  */
 298   OMP_CLAUSE_FROM,
 299
 300   /* OpenMP clause: to (variable-list).  */
 301   OMP_CLAUSE_TO,
 302
 303   /* OpenACC clauses: {copy, copyin, copyout, create, delete, deviceptr,
 304      device, host (self), present, present_or_copy (pcopy), present_or_copyin
 305      (pcopyin), present_or_copyout (pcopyout), present_or_create (pcreate)}
 306      (variable-list).
 307
 308      OpenMP clause: map ({alloc:,to:,from:,tofrom:,}variable-list).  */
 309   OMP_CLAUSE_MAP,
 310
 311   /* OpenACC clause: use_device (variable_list).
 312      OpenMP clause: use_device_ptr (variable-list).  */
 313   OMP_CLAUSE_USE_DEVICE_PTR,
 314
 315   /* OpenMP clause: is_device_ptr (variable-list).  */
 316   OMP_CLAUSE_IS_DEVICE_PTR,
 317
 318   /* Internal structure to hold OpenACC cache directive's variable-list.
 319      #pragma acc cache (variable-list).  */
 320   OMP_CLAUSE__CACHE_,
 321
 322   /* OpenACC clause: gang [(gang-argument-list)].
 323      Where
 324       gang-argument-list: [gang-argument-list, ] gang-argument
 325       gang-argument: [num:] integer-expression
 326                    | static: size-expression
 327       size-expression: * | integer-expression.  */
 328   OMP_CLAUSE_GANG,
 329
 330   /* OpenACC clause: async [(integer-expression)].  */
 331   OMP_CLAUSE_ASYNC,
 332
 333   /* OpenACC clause: wait [(integer-expression-list)].  */
 334   OMP_CLAUSE_WAIT,
 335
 336   /* OpenACC clause: auto.  */
 337   OMP_CLAUSE_AUTO,
 338
 339   /* OpenACC clause: seq.  */
 340   OMP_CLAUSE_SEQ,
 341
 342   /* Internal clause: temporary for combined loops expansion.  */
 343   OMP_CLAUSE__LOOPTEMP_,
 344
 345   /* OpenACC/OpenMP clause: if (scalar-expression).  */
 346   OMP_CLAUSE_IF,
 347
 348   /* OpenMP clause: num_threads (integer-expression).  */
 349   OMP_CLAUSE_NUM_THREADS,
 350
 351   /* OpenMP clause: schedule.  */
 352   OMP_CLAUSE_SCHEDULE,
 353
 354   /* OpenMP clause: nowait.  */
 355   OMP_CLAUSE_NOWAIT,
 356
 357   /* OpenMP clause: ordered [(constant-integer-expression)].  */
 358   OMP_CLAUSE_ORDERED,
 359
 360   /* OpenMP clause: default.  */
 361   OMP_CLAUSE_DEFAULT,
 362
 363   /* OpenACC/OpenMP clause: collapse (constant-integer-expression).  */
 364   OMP_CLAUSE_COLLAPSE,
 365
 366   /* OpenMP clause: untied.  */
 367   OMP_CLAUSE_UNTIED,
 368
 369   /* OpenMP clause: final (scalar-expression).  */
 370   OMP_CLAUSE_FINAL,
 371
 372   /* OpenMP clause: mergeable.  */
 373   OMP_CLAUSE_MERGEABLE,
 374
 375   /* OpenMP clause: device (integer-expression).  */
 376   OMP_CLAUSE_DEVICE,
 377
 378   /* OpenMP clause: dist_schedule (static[:chunk-size]).  */
 379   OMP_CLAUSE_DIST_SCHEDULE,
 380
 381   /* OpenMP clause: inbranch.  */
 382   OMP_CLAUSE_INBRANCH,
 383
 384   /* OpenMP clause: notinbranch.  */
 385   OMP_CLAUSE_NOTINBRANCH,
 386
 387   /* OpenMP clause: num_teams(integer-expression).  */
 388   OMP_CLAUSE_NUM_TEAMS,
 389
 390   /* OpenMP clause: thread_limit(integer-expression).  */
 391   OMP_CLAUSE_THREAD_LIMIT,
 392
 393   /* OpenMP clause: proc_bind ({master,close,spread}).  */
 394   OMP_CLAUSE_PROC_BIND,
 395
 396   /* OpenMP clause: safelen (constant-integer-expression).  */
 397   OMP_CLAUSE_SAFELEN,
 398
 399   /* OpenMP clause: simdlen (constant-integer-expression).  */
 400   OMP_CLAUSE_SIMDLEN,
 401
 402   /* OpenMP clause: for.  */
 403   OMP_CLAUSE_FOR,
 404
 405   /* OpenMP clause: parallel.  */
 406   OMP_CLAUSE_PARALLEL,
 407
 408   /* OpenMP clause: sections.  */
 409   OMP_CLAUSE_SECTIONS,
 410
 411   /* OpenMP clause: taskgroup.  */
 412   OMP_CLAUSE_TASKGROUP,
 413
 414   /* OpenMP clause: priority (integer-expression).  */
 415   OMP_CLAUSE_PRIORITY,
 416
 417   /* OpenMP clause: grainsize (integer-expression).  */
 418   OMP_CLAUSE_GRAINSIZE,
 419
 420   /* OpenMP clause: num_tasks (integer-expression).  */
 421   OMP_CLAUSE_NUM_TASKS,
 422
 423   /* OpenMP clause: nogroup.  */
 424   OMP_CLAUSE_NOGROUP,
 425
 426   /* OpenMP clause: threads.  */
 427   OMP_CLAUSE_THREADS,
 428
 429   /* OpenMP clause: simd.  */
 430   OMP_CLAUSE_SIMD,
 431
 432   /* OpenMP clause: hint (integer-expression).  */
 433   OMP_CLAUSE_HINT,
 434
 435   /* OpenMP clause: defaultmap (tofrom: scalar).  */
 436   OMP_CLAUSE_DEFAULTMAP,
 437
 438   /* Internally used only clause, holding SIMD uid.  */
 439   OMP_CLAUSE__SIMDUID_,
 440
 441   /* Internally used only clause, holding _Cilk_for # of iterations
 442      on OMP_PARALLEL.  */
 443   OMP_CLAUSE__CILK_FOR_COUNT_,
 444
 445   /* OpenACC clause: independent.  */
 446   OMP_CLAUSE_INDEPENDENT,
 447
 448   /* OpenACC clause: worker [( [num:] integer-expression)].  */
 449   OMP_CLAUSE_WORKER,
 450
 451   /* OpenACC clause: vector [( [length:] integer-expression)].  */
 452   OMP_CLAUSE_VECTOR,
 453
 454   /* OpenACC clause: num_gangs (integer-expression).  */
 455   OMP_CLAUSE_NUM_GANGS,
 456
 457   /* OpenACC clause: num_workers (integer-expression).  */
 458   OMP_CLAUSE_NUM_WORKERS,
 459
 460   /* OpenACC clause: vector_length (integer-expression).  */
 461   OMP_CLAUSE_VECTOR_LENGTH,
 462
 463   /* OpenACC clause: tile ( size-expr-list ).  */
 464   OMP_CLAUSE_TILE,
 465
 466   /* OpenMP internal-only clause to specify grid dimensions of a gridified
 467      kernel.  */
 468   OMP_CLAUSE__GRIDDIM_
 469 };
 470
 471 #undef DEFTREESTRUCT
 472 #define DEFTREESTRUCT(ENUM, NAME) ENUM,
 473 enum tree_node_structure_enum {
 474 #include "treestruct.def"
 475   LAST_TS_ENUM
 476 };
 477 #undef DEFTREESTRUCT
 478
 479 enum omp_clause_schedule_kind {
 480   OMP_CLAUSE_SCHEDULE_STATIC,
 481   OMP_CLAUSE_SCHEDULE_DYNAMIC,
 482   OMP_CLAUSE_SCHEDULE_GUIDED,
 483   OMP_CLAUSE_SCHEDULE_AUTO,
 484   OMP_CLAUSE_SCHEDULE_RUNTIME,
 485   OMP_CLAUSE_SCHEDULE_CILKFOR,
 486   OMP_CLAUSE_SCHEDULE_MASK = (1 << 3) - 1,
 487   OMP_CLAUSE_SCHEDULE_MONOTONIC = (1 << 3),
 488   OMP_CLAUSE_SCHEDULE_NONMONOTONIC = (1 << 4),
 489   OMP_CLAUSE_SCHEDULE_LAST = 2 * OMP_CLAUSE_SCHEDULE_NONMONOTONIC - 1
 490 };
 491
 492 enum omp_clause_default_kind {
 493   OMP_CLAUSE_DEFAULT_UNSPECIFIED,
 494   OMP_CLAUSE_DEFAULT_SHARED,
 495   OMP_CLAUSE_DEFAULT_NONE,
 496   OMP_CLAUSE_DEFAULT_PRIVATE,
 497   OMP_CLAUSE_DEFAULT_FIRSTPRIVATE,
 498   OMP_CLAUSE_DEFAULT_LAST
 499 };
 500
 501 /* There is a TYPE_QUAL value for each type qualifier.  They can be
 502    combined by bitwise-or to form the complete set of qualifiers for a
 503    type.  */
 504 enum cv_qualifier {
 505   TYPE_UNQUALIFIED   = 0x0,
 506   TYPE_QUAL_CONST    = 0x1,
 507   TYPE_QUAL_VOLATILE = 0x2,
 508   TYPE_QUAL_RESTRICT = 0x4,
 509   TYPE_QUAL_ATOMIC   = 0x8
 510 };
 511
 512 /* Standard named or nameless data types of the C compiler.  */
 513 enum tree_index {
 514   TI_ERROR_MARK,
 515   TI_INTQI_TYPE,
 516   TI_INTHI_TYPE,
 517   TI_INTSI_TYPE,
 518   TI_INTDI_TYPE,
 519   TI_INTTI_TYPE,
 520
 521   TI_UINTQI_TYPE,
 522   TI_UINTHI_TYPE,
 523   TI_UINTSI_TYPE,
 524   TI_UINTDI_TYPE,
 525   TI_UINTTI_TYPE,
 526
 527   TI_ATOMICQI_TYPE,
 528   TI_ATOMICHI_TYPE,
 529   TI_ATOMICSI_TYPE,
 530   TI_ATOMICDI_TYPE,
 531   TI_ATOMICTI_TYPE,
 532
 533   TI_UINT16_TYPE,
 534   TI_UINT32_TYPE,
 535   TI_UINT64_TYPE,
 536
 537   TI_VOID,
 538
 539   TI_INTEGER_ZERO,
 540   TI_INTEGER_ONE,
 541   TI_INTEGER_THREE,
 542   TI_INTEGER_MINUS_ONE,
 543   TI_NULL_POINTER,
 544
 545   TI_SIZE_ZERO,
 546   TI_SIZE_ONE,
 547
 548   TI_BITSIZE_ZERO,
 549   TI_BITSIZE_ONE,
 550   TI_BITSIZE_UNIT,
 551
 552   TI_PUBLIC,
 553   TI_PROTECTED,
 554   TI_PRIVATE,
 555
 556   TI_BOOLEAN_FALSE,
 557   TI_BOOLEAN_TRUE,
 558
 559   TI_FLOAT_TYPE,
 560   TI_DOUBLE_TYPE,
 561   TI_LONG_DOUBLE_TYPE,
 562
 563   /* The _FloatN and _FloatNx types must be consecutive, and in the
 564      same sequence as the corresponding complex types, which must also
 565      be consecutive; _FloatN must come before _FloatNx; the order must
 566      also be the same as in the floatn_nx_types array and the RID_*
 567      values in c-common.h.  This is so that iterations over these
 568      types work as intended.  */
 569   TI_FLOAT16_TYPE,
 570   TI_FLOATN_TYPE_FIRST = TI_FLOAT16_TYPE,
 571   TI_FLOATN_NX_TYPE_FIRST = TI_FLOAT16_TYPE,
 572   TI_FLOAT32_TYPE,
 573   TI_FLOAT64_TYPE,
 574   TI_FLOAT128_TYPE,
 575   TI_FLOATN_TYPE_LAST = TI_FLOAT128_TYPE,
 576 #define NUM_FLOATN_TYPES (TI_FLOATN_TYPE_LAST - TI_FLOATN_TYPE_FIRST + 1)
 577   TI_FLOAT32X_TYPE,
 578   TI_FLOATNX_TYPE_FIRST = TI_FLOAT32X_TYPE,
 579   TI_FLOAT64X_TYPE,
 580   TI_FLOAT128X_TYPE,
 581   TI_FLOATNX_TYPE_LAST = TI_FLOAT128X_TYPE,
 582   TI_FLOATN_NX_TYPE_LAST = TI_FLOAT128X_TYPE,
 583 #define NUM_FLOATNX_TYPES (TI_FLOATNX_TYPE_LAST - TI_FLOATNX_TYPE_FIRST + 1)
 584 #define NUM_FLOATN_NX_TYPES (TI_FLOATN_NX_TYPE_LAST             \
 585                              - TI_FLOATN_NX_TYPE_FIRST          \
 586                              + 1)
 587
 588   /* Put the complex types after their component types, so that in (sequential)
 589      tree streaming we can assert that their component types have already been
 590      handled (see tree-streamer.c:record_common_node).  */
 591   TI_COMPLEX_INTEGER_TYPE,
 592   TI_COMPLEX_FLOAT_TYPE,
 593   TI_COMPLEX_DOUBLE_TYPE,
 594   TI_COMPLEX_LONG_DOUBLE_TYPE,
 595
 596   TI_COMPLEX_FLOAT16_TYPE,
 597   TI_COMPLEX_FLOATN_NX_TYPE_FIRST = TI_COMPLEX_FLOAT16_TYPE,
 598   TI_COMPLEX_FLOAT32_TYPE,
 599   TI_COMPLEX_FLOAT64_TYPE,
 600   TI_COMPLEX_FLOAT128_TYPE,
 601   TI_COMPLEX_FLOAT32X_TYPE,
 602   TI_COMPLEX_FLOAT64X_TYPE,
 603   TI_COMPLEX_FLOAT128X_TYPE,
 604
 605   TI_FLOAT_PTR_TYPE,
 606   TI_DOUBLE_PTR_TYPE,
 607   TI_LONG_DOUBLE_PTR_TYPE,
 608   TI_INTEGER_PTR_TYPE,
 609
 610   TI_VOID_TYPE,
 611   TI_PTR_TYPE,
 612   TI_CONST_PTR_TYPE,
 613   TI_SIZE_TYPE,
 614   TI_PID_TYPE,
 615   TI_PTRDIFF_TYPE,
 616   TI_VA_LIST_TYPE,
 617   TI_VA_LIST_GPR_COUNTER_FIELD,
 618   TI_VA_LIST_FPR_COUNTER_FIELD,
 619   TI_BOOLEAN_TYPE,
 620   TI_FILEPTR_TYPE,
 621   TI_POINTER_SIZED_TYPE,
 622
 623   TI_POINTER_BOUNDS_TYPE,
 624
 625   TI_DFLOAT32_TYPE,
 626   TI_DFLOAT64_TYPE,
 627   TI_DFLOAT128_TYPE,
 628   TI_DFLOAT32_PTR_TYPE,
 629   TI_DFLOAT64_PTR_TYPE,
 630   TI_DFLOAT128_PTR_TYPE,
 631
 632   TI_VOID_LIST_NODE,
 633
 634   TI_MAIN_IDENTIFIER,
 635
 636   TI_SAT_SFRACT_TYPE,
 637   TI_SAT_FRACT_TYPE,
 638   TI_SAT_LFRACT_TYPE,
 639   TI_SAT_LLFRACT_TYPE,
 640   TI_SAT_USFRACT_TYPE,
 641   TI_SAT_UFRACT_TYPE,
 642   TI_SAT_ULFRACT_TYPE,
 643   TI_SAT_ULLFRACT_TYPE,
 644   TI_SFRACT_TYPE,
 645   TI_FRACT_TYPE,
 646   TI_LFRACT_TYPE,
 647   TI_LLFRACT_TYPE,
 648   TI_USFRACT_TYPE,
 649   TI_UFRACT_TYPE,
 650   TI_ULFRACT_TYPE,
 651   TI_ULLFRACT_TYPE,
 652   TI_SAT_SACCUM_TYPE,
 653   TI_SAT_ACCUM_TYPE,
 654   TI_SAT_LACCUM_TYPE,
 655   TI_SAT_LLACCUM_TYPE,
 656   TI_SAT_USACCUM_TYPE,
 657   TI_SAT_UACCUM_TYPE,
 658   TI_SAT_ULACCUM_TYPE,
 659   TI_SAT_ULLACCUM_TYPE,
 660   TI_SACCUM_TYPE,
 661   TI_ACCUM_TYPE,
 662   TI_LACCUM_TYPE,
 663   TI_LLACCUM_TYPE,
 664   TI_USACCUM_TYPE,
 665   TI_UACCUM_TYPE,
 666   TI_ULACCUM_TYPE,
 667   TI_ULLACCUM_TYPE,
 668   TI_QQ_TYPE,
 669   TI_HQ_TYPE,
 670   TI_SQ_TYPE,
 671   TI_DQ_TYPE,
 672   TI_TQ_TYPE,
 673   TI_UQQ_TYPE,
 674   TI_UHQ_TYPE,
 675   TI_USQ_TYPE,
 676   TI_UDQ_TYPE,
 677   TI_UTQ_TYPE,
 678   TI_SAT_QQ_TYPE,
 679   TI_SAT_HQ_TYPE,
 680   TI_SAT_SQ_TYPE,
 681   TI_SAT_DQ_TYPE,
 682   TI_SAT_TQ_TYPE,
 683   TI_SAT_UQQ_TYPE,
 684   TI_SAT_UHQ_TYPE,
 685   TI_SAT_USQ_TYPE,
 686   TI_SAT_UDQ_TYPE,
 687   TI_SAT_UTQ_TYPE,
 688   TI_HA_TYPE,
 689   TI_SA_TYPE,
 690   TI_DA_TYPE,
 691   TI_TA_TYPE,
 692   TI_UHA_TYPE,
 693   TI_USA_TYPE,
 694   TI_UDA_TYPE,
 695   TI_UTA_TYPE,
 696   TI_SAT_HA_TYPE,
 697   TI_SAT_SA_TYPE,
 698   TI_SAT_DA_TYPE,
 699   TI_SAT_TA_TYPE,
 700   TI_SAT_UHA_TYPE,
 701   TI_SAT_USA_TYPE,
 702   TI_SAT_UDA_TYPE,
 703   TI_SAT_UTA_TYPE,
 704
 705   TI_OPTIMIZATION_DEFAULT,
 706   TI_OPTIMIZATION_CURRENT,
 707   TI_TARGET_OPTION_DEFAULT,
 708   TI_TARGET_OPTION_CURRENT,
 709   TI_CURRENT_TARGET_PRAGMA,
 710   TI_CURRENT_OPTIMIZE_PRAGMA,
 711
 712   TI_MAX
 713 };
 714
 715 /* An enumeration of the standard C integer types.  These must be
 716    ordered so that shorter types appear before longer ones, and so
 717    that signed types appear before unsigned ones, for the correct
 718    functioning of interpret_integer() in c-lex.c.  */
 719 enum integer_type_kind {
 720   itk_char,
 721   itk_signed_char,
 722   itk_unsigned_char,
 723   itk_short,
 724   itk_unsigned_short,
 725   itk_int,
 726   itk_unsigned_int,
 727   itk_long,
 728   itk_unsigned_long,
 729   itk_long_long,
 730   itk_unsigned_long_long,
 731
 732   itk_intN_0,
 733   itk_unsigned_intN_0,
 734   itk_intN_1,
 735   itk_unsigned_intN_1,
 736   itk_intN_2,
 737   itk_unsigned_intN_2,
 738   itk_intN_3,
 739   itk_unsigned_intN_3,
 740
 741   itk_none
 742 };
 743
 744 /* A pointer-to-function member type looks like:
 745
 746      struct {
 747        __P __pfn;
 748        ptrdiff_t __delta;
 749      };
 750
 751    If __pfn is NULL, it is a NULL pointer-to-member-function.
 752
 753    (Because the vtable is always the first thing in the object, we
 754    don't need its offset.)  If the function is virtual, then PFN is
 755    one plus twice the index into the vtable; otherwise, it is just a
 756    pointer to the function.
 757
 758    Unfortunately, using the lowest bit of PFN doesn't work in
 759    architectures that don't impose alignment requirements on function
 760    addresses, or that use the lowest bit to tell one ISA from another,
 761    for example.  For such architectures, we use the lowest bit of
 762    DELTA instead of the lowest bit of the PFN, and DELTA will be
 763    multiplied by 2.  */
 764 enum ptrmemfunc_vbit_where_t {
 765   ptrmemfunc_vbit_in_pfn,
 766   ptrmemfunc_vbit_in_delta
 767 };
 768
 769 /* Flags that may be passed in the third argument of decl_attributes, and
 770    to handler functions for attributes.  */
 771 enum attribute_flags {
 772   /* The type passed in is the type of a DECL, and any attributes that
 773      should be passed in again to be applied to the DECL rather than the
 774      type should be returned.  */
 775   ATTR_FLAG_DECL_NEXT = 1,
 776   /* The type passed in is a function return type, and any attributes that
 777      should be passed in again to be applied to the function type rather
 778      than the return type should be returned.  */
 779   ATTR_FLAG_FUNCTION_NEXT = 2,
 780   /* The type passed in is an array element type, and any attributes that
 781      should be passed in again to be applied to the array type rather
 782      than the element type should be returned.  */
 783   ATTR_FLAG_ARRAY_NEXT = 4,
 784   /* The type passed in is a structure, union or enumeration type being
 785      created, and should be modified in place.  */
 786   ATTR_FLAG_TYPE_IN_PLACE = 8,
 787   /* The attributes are being applied by default to a library function whose
 788      name indicates known behavior, and should be silently ignored if they
 789      are not in fact compatible with the function type.  */
 790   ATTR_FLAG_BUILT_IN = 16,
 791   /* A given attribute has been parsed as a C++-11 attribute.  */
 792   ATTR_FLAG_CXX11 = 32
 793 };
 794
 795 /* Types used to represent sizes.  */
 796 enum size_type_kind {
 797   stk_sizetype,         /* Normal representation of sizes in bytes.  */
 798   stk_ssizetype,        /* Signed representation of sizes in bytes.  */
 799   stk_bitsizetype,      /* Normal representation of sizes in bits.  */
 800   stk_sbitsizetype,     /* Signed representation of sizes in bits.  */
 801   stk_type_kind_last
 802 };
 803
 804 enum operand_equal_flag {
 805   OEP_ONLY_CONST = 1,
 806   OEP_PURE_SAME = 2,
 807   OEP_MATCH_SIDE_EFFECTS = 4,
 808   OEP_ADDRESS_OF = 8,
 809   /* Internal within operand_equal_p:  */
 810   OEP_NO_HASH_CHECK = 16,
 811   /* Internal within inchash::add_expr:  */
 812   OEP_HASH_CHECK = 32
 813 };
 814
 815 /* Enum and arrays used for tree allocation stats.
 816    Keep in sync with tree.c:tree_node_kind_names.  */
 817 enum tree_node_kind {
 818   d_kind,
 819   t_kind,
 820   b_kind,
 821   s_kind,
 822   r_kind,
 823   e_kind,
 824   c_kind,
 825   id_kind,
 826   vec_kind,
 827   binfo_kind,
 828   ssa_name_kind,
 829   constr_kind,
 830   x_kind,
 831   lang_decl,
 832   lang_type,
 833   omp_clause_kind,
 834   all_kinds
 835 };
 836
 837 enum annot_expr_kind {
 838   annot_expr_ivdep_kind,
 839   annot_expr_no_vector_kind,
 840   annot_expr_vector_kind,
 841   annot_expr_kind_last
 842 };
 843
 844 /*---------------------------------------------------------------------------
 845                                 Type definitions
 846 ---------------------------------------------------------------------------*/
 847 /* When processing aliases at the symbol table level, we need the
 848    declaration of target. For this reason we need to queue aliases and
 849    process them after all declarations has been produced.  */
 850 struct GTY(()) alias_pair {
 851   tree decl;
 852   tree target;
 853 };
 854
 855 /* An initialization priority.  */
 856 typedef unsigned short priority_type;
 857
 858 /* The type of a callback function for walking over tree structure.  */
 859 typedef tree (*walk_tree_fn) (tree *, int *, void *);
 860
 861 /* The type of a callback function that represents a custom walk_tree.  */
 862 typedef tree (*walk_tree_lh) (tree *, int *, tree (*) (tree *, int *, void *),
 863                               void *, hash_set<tree> *);
 864
 865
 866 /*---------------------------------------------------------------------------
 867                               Main data structures
 868 ---------------------------------------------------------------------------*/
 869 /* A tree node can represent a data type, a variable, an expression
 870    or a statement.  Each node has a TREE_CODE which says what kind of
 871    thing it represents.  Some common codes are:
 872    INTEGER_TYPE -- represents a type of integers.
 873    ARRAY_TYPE -- represents a type of pointer.
 874    VAR_DECL -- represents a declared variable.
 875    INTEGER_CST -- represents a constant integer value.
 876    PLUS_EXPR -- represents a sum (an expression).
 877
 878    As for the contents of a tree node: there are some fields
 879    that all nodes share.  Each TREE_CODE has various special-purpose
 880    fields as well.  The fields of a node are never accessed directly,
 881    always through accessor macros.  */
 882
 883 /* Every kind of tree node starts with this structure,
 884    so all nodes have these fields.
 885
 886    See the accessor macros, defined below, for documentation of the
 887    fields, and the table below which connects the fields and the
 888    accessor macros.  */
 889
 890 struct GTY(()) tree_base {
 891   ENUM_BITFIELD(tree_code) code : 16;
 892
 893   unsigned side_effects_flag : 1;
 894   unsigned constant_flag : 1;
 895   unsigned addressable_flag : 1;
 896   unsigned volatile_flag : 1;
 897   unsigned readonly_flag : 1;
 898   unsigned asm_written_flag: 1;
 899   unsigned nowarning_flag : 1;
 900   unsigned visited : 1;
 901
 902   unsigned used_flag : 1;
 903   unsigned nothrow_flag : 1;
 904   unsigned static_flag : 1;
 905   unsigned public_flag : 1;
 906   unsigned private_flag : 1;
 907   unsigned protected_flag : 1;
 908   unsigned deprecated_flag : 1;
 909   unsigned default_def_flag : 1;
 910
 911   union {
 912     /* The bits in the following structure should only be used with
 913        accessor macros that constrain inputs with tree checking.  */
 914     struct {
 915       unsigned lang_flag_0 : 1;
 916       unsigned lang_flag_1 : 1;
 917       unsigned lang_flag_2 : 1;
 918       unsigned lang_flag_3 : 1;
 919       unsigned lang_flag_4 : 1;
 920       unsigned lang_flag_5 : 1;
 921       unsigned lang_flag_6 : 1;
 922       unsigned saturating_flag : 1;
 923
 924       unsigned unsigned_flag : 1;
 925       unsigned packed_flag : 1;
 926       unsigned user_align : 1;
 927       unsigned nameless_flag : 1;
 928       unsigned atomic_flag : 1;
 929       unsigned spare0 : 3;
 930
 931       unsigned spare1 : 8;
 932
 933       /* This field is only used with TREE_TYPE nodes; the only reason it is
 934          present in tree_base instead of tree_type is to save space.  The size
 935          of the field must be large enough to hold addr_space_t values.  */
 936       unsigned address_space : 8;
 937     } bits;
 938
 939     /* The following fields are present in tree_base to save space.  The
 940        nodes using them do not require any of the flags above and so can
 941        make better use of the 4-byte sized word.  */
 942
 943     /* The number of HOST_WIDE_INTs in an INTEGER_CST.  */
 944     struct {
 945       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
 946          its native precision.  */
 947       unsigned char unextended;
 948
 949       /* The number of HOST_WIDE_INTs if the INTEGER_CST is extended to
 950          wider precisions based on its TYPE_SIGN.  */
 951       unsigned char extended;
 952
 953       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
 954          offset_int precision, with smaller integers being extended
 955          according to their TYPE_SIGN.  This is equal to one of the two
 956          fields above but is cached for speed.  */
 957       unsigned char offset;
 958     } int_length;
 959
 960     /* VEC length.  This field is only used with TREE_VEC.  */
 961     int length;
 962
 963     /* SSA version number.  This field is only used with SSA_NAME.  */
 964     unsigned int version;
 965
 966     /* Internal function code.  */
 967     enum internal_fn ifn;
 968
 969     /* The following two fields are used for MEM_REF and TARGET_MEM_REF
 970        expression trees and specify known data non-dependences.  For
 971        two memory references in a function they are known to not
 972        alias if dependence_info.clique are equal and dependence_info.base
 973        are distinct.  */
 974     struct {
 975       unsigned short clique;
 976       unsigned short base;
 977     } dependence_info;
 978   } GTY((skip(""))) u;
 979 };
 980
 981 /* The following table lists the uses of each of the above flags and
 982    for which types of nodes they are defined.
 983
 984    addressable_flag:
 985
 986        TREE_ADDRESSABLE in
 987            VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
 988            SSA_NAME
 989            all types
 990            CONSTRUCTOR, IDENTIFIER_NODE
 991            STMT_EXPR
 992
 993        CALL_EXPR_TAILCALL in
 994            CALL_EXPR
 995
 996        CASE_LOW_SEEN in
 997            CASE_LABEL_EXPR
 998
 999        PREDICT_EXPR_OUTCOME in
1000            PREDICT_EXPR
1001
1002    static_flag:
1003
1004        TREE_STATIC in
1005            VAR_DECL, FUNCTION_DECL
1006            CONSTRUCTOR
1007
1008        TREE_NO_TRAMPOLINE in
1009            ADDR_EXPR
1010
1011        BINFO_VIRTUAL_P in
1012            TREE_BINFO
1013
1014        TREE_SYMBOL_REFERENCED in
1015            IDENTIFIER_NODE
1016
1017        CLEANUP_EH_ONLY in
1018            TARGET_EXPR, WITH_CLEANUP_EXPR
1019
1020        TRY_CATCH_IS_CLEANUP in
1021            TRY_CATCH_EXPR
1022
1023        ASM_INPUT_P in
1024            ASM_EXPR
1025
1026        TYPE_REF_CAN_ALIAS_ALL in
1027            POINTER_TYPE, REFERENCE_TYPE
1028
1029        CASE_HIGH_SEEN in
1030            CASE_LABEL_EXPR
1031
1032        ENUM_IS_SCOPED in
1033            ENUMERAL_TYPE
1034
1035        TRANSACTION_EXPR_OUTER in
1036            TRANSACTION_EXPR
1037
1038        SSA_NAME_ANTI_RANGE_P in
1039            SSA_NAME
1040
1041        MUST_TAIL_CALL in
1042            CALL_EXPR
1043
1044    public_flag:
1045
1046        TREE_OVERFLOW in
1047            INTEGER_CST, REAL_CST, COMPLEX_CST, VECTOR_CST
1048
1049        TREE_PUBLIC in
1050            VAR_DECL, FUNCTION_DECL
1051            IDENTIFIER_NODE
1052
1053        CONSTRUCTOR_NO_CLEARING in
1054            CONSTRUCTOR
1055
1056        ASM_VOLATILE_P in
1057            ASM_EXPR
1058
1059        CALL_EXPR_VA_ARG_PACK in
1060            CALL_EXPR
1061
1062        TYPE_CACHED_VALUES_P in
1063            all types
1064
1065        SAVE_EXPR_RESOLVED_P in
1066            SAVE_EXPR
1067
1068        OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE in
1069            OMP_CLAUSE_LASTPRIVATE
1070
1071        OMP_CLAUSE_PRIVATE_DEBUG in
1072            OMP_CLAUSE_PRIVATE
1073
1074        OMP_CLAUSE_LINEAR_NO_COPYIN in
1075            OMP_CLAUSE_LINEAR
1076
1077        OMP_CLAUSE_MAP_ZERO_BIAS_ARRAY_SECTION in
1078            OMP_CLAUSE_MAP
1079
1080        OMP_CLAUSE_REDUCTION_OMP_ORIG_REF in
1081            OMP_CLAUSE_REDUCTION
1082
1083        TRANSACTION_EXPR_RELAXED in
1084            TRANSACTION_EXPR
1085
1086        FALLTHROUGH_LABEL_P in
1087            LABEL_DECL
1088
1089    private_flag:
1090
1091        TREE_PRIVATE in
1092            all decls
1093
1094        CALL_EXPR_RETURN_SLOT_OPT in
1095            CALL_EXPR
1096
1097        OMP_SECTION_LAST in
1098            OMP_SECTION
1099
1100        OMP_PARALLEL_COMBINED in
1101            OMP_PARALLEL
1102
1103        OMP_ATOMIC_SEQ_CST in
1104            OMP_ATOMIC*
1105
1106        OMP_CLAUSE_PRIVATE_OUTER_REF in
1107            OMP_CLAUSE_PRIVATE
1108
1109        OMP_CLAUSE_LINEAR_NO_COPYOUT in
1110            OMP_CLAUSE_LINEAR
1111
1112        TYPE_REF_IS_RVALUE in
1113            REFERENCE_TYPE
1114
1115        ENUM_IS_OPAQUE in
1116            ENUMERAL_TYPE
1117
1118    protected_flag:
1119
1120        TREE_PROTECTED in
1121            BLOCK
1122            all decls
1123
1124        CALL_FROM_THUNK_P and
1125        CALL_ALLOCA_FOR_VAR_P in
1126            CALL_EXPR
1127
1128        OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
1129            OMP_CLAUSE_LINEAR
1130
1131    side_effects_flag:
1132
1133        TREE_SIDE_EFFECTS in
1134            all expressions
1135            all decls
1136            all constants
1137
1138        FORCED_LABEL in
1139            LABEL_DECL
1140
1141    volatile_flag:
1142
1143        TREE_THIS_VOLATILE in
1144            all expressions
1145            all decls
1146
1147        TYPE_VOLATILE in
1148            all types
1149
1150    readonly_flag:
1151
1152        TREE_READONLY in
1153            all expressions
1154            all decls
1155
1156        TYPE_READONLY in
1157            all types
1158
1159    constant_flag:
1160
1161        TREE_CONSTANT in
1162            all expressions
1163            all decls
1164            all constants
1165
1166        TYPE_SIZES_GIMPLIFIED in
1167            all types
1168
1169    unsigned_flag:
1170
1171        TYPE_UNSIGNED in
1172            all types
1173
1174        DECL_UNSIGNED in
1175            all decls
1176
1177    asm_written_flag:
1178
1179        TREE_ASM_WRITTEN in
1180            VAR_DECL, FUNCTION_DECL, TYPE_DECL
1181            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE
1182            BLOCK, STRING_CST
1183
1184        SSA_NAME_OCCURS_IN_ABNORMAL_PHI in
1185            SSA_NAME
1186
1187    used_flag:
1188
1189        TREE_USED in
1190            all expressions
1191            all decls
1192            IDENTIFIER_NODE
1193
1194    nothrow_flag:
1195
1196        TREE_NOTHROW in
1197            CALL_EXPR
1198            FUNCTION_DECL
1199
1200        TREE_THIS_NOTRAP in
1201           INDIRECT_REF, MEM_REF, TARGET_MEM_REF, ARRAY_REF, ARRAY_RANGE_REF
1202
1203        SSA_NAME_IN_FREE_LIST in
1204           SSA_NAME
1205
1206        DECL_NONALIASED in
1207           VAR_DECL
1208
1209    deprecated_flag:
1210
1211        TREE_DEPRECATED in
1212            all decls
1213            all types
1214
1215        IDENTIFIER_TRANSPARENT_ALIAS in
1216            IDENTIFIER_NODE
1217
1218    visited:
1219
1220        TREE_VISITED in
1221            all trees (used liberally by many passes)
1222
1223    saturating_flag:
1224
1225        TYPE_REVERSE_STORAGE_ORDER in
1226            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE, ARRAY_TYPE
1227
1228        TYPE_SATURATING in
1229            other types
1230
1231        VAR_DECL_IS_VIRTUAL_OPERAND in
1232            VAR_DECL
1233
1234    nowarning_flag:
1235
1236        TREE_NO_WARNING in
1237            all expressions
1238            all decls
1239
1240        TYPE_ARTIFICIAL in
1241            all types
1242
1243    default_def_flag:
1244
1245        TYPE_FINAL_P in
1246            RECORD_TYPE, UNION_TYPE and QUAL_UNION_TYPE
1247
1248        TYPE_VECTOR_OPAQUE in
1249            VECTOR_TYPE
1250
1251        SSA_NAME_IS_DEFAULT_DEF in
1252            SSA_NAME
1253
1254        DECL_NONLOCAL_FRAME in
1255            VAR_DECL
1256
1257        REF_REVERSE_STORAGE_ORDER in
1258            BIT_FIELD_REF, MEM_REF
1259
1260        FUNC_ADDR_BY_DESCRIPTOR in
1261            ADDR_EXPR
1262
1263        CALL_EXPR_BY_DESCRIPTOR in
1264            CALL_EXPR
1265 */
1266
1267 struct GTY(()) tree_typed {
1268   struct tree_base base;
1269   tree type;
1270 };
1271
1272 struct GTY(()) tree_common {
1273   struct tree_typed typed;
1274   tree chain;
1275 };
1276
1277 struct GTY(()) tree_int_cst {
1278   struct tree_typed typed;
1279   HOST_WIDE_INT val[1];
1280 };
1281
1282
1283 struct GTY(()) tree_real_cst {
1284   struct tree_typed typed;
1285   struct real_value * real_cst_ptr;
1286 };
1287
1288 struct GTY(()) tree_fixed_cst {
1289   struct tree_typed typed;
1290   struct fixed_value * fixed_cst_ptr;
1291 };
1292
1293 struct GTY(()) tree_string {
1294   struct tree_typed typed;
1295   int length;
1296   char str[1];
1297 };
1298
1299 struct GTY(()) tree_complex {
1300   struct tree_typed typed;
1301   tree real;
1302   tree imag;
1303 };
1304
1305 struct GTY(()) tree_vector {
1306   struct tree_typed typed;
1307   tree GTY ((length ("TYPE_VECTOR_SUBPARTS (TREE_TYPE ((tree)&%h))"))) elts[1];
1308 };
1309
1310 struct GTY(()) tree_identifier {
1311   struct tree_common common;
1312   struct ht_identifier id;
1313 };
1314
1315 struct GTY(()) tree_list {
1316   struct tree_common common;
1317   tree purpose;
1318   tree value;
1319 };
1320
1321 struct GTY(()) tree_vec {
1322   struct tree_common common;
1323   tree GTY ((length ("TREE_VEC_LENGTH ((tree)&%h)"))) a[1];
1324 };
1325
1326 /* A single element of a CONSTRUCTOR. VALUE holds the actual value of the
1327    element. INDEX can optionally design the position of VALUE: in arrays,
1328    it is the index where VALUE has to be placed; in structures, it is the
1329    FIELD_DECL of the member.  */
1330 struct GTY(()) constructor_elt {
1331   tree index;
1332   tree value;
1333 };
1334
1335 struct GTY(()) tree_constructor {
1336   struct tree_typed typed;
1337   vec<constructor_elt, va_gc> *elts;
1338 };
1339
1340 enum omp_clause_depend_kind
1341 {
1342   OMP_CLAUSE_DEPEND_IN,
1343   OMP_CLAUSE_DEPEND_OUT,
1344   OMP_CLAUSE_DEPEND_INOUT,
1345   OMP_CLAUSE_DEPEND_SOURCE,
1346   OMP_CLAUSE_DEPEND_SINK,
1347   OMP_CLAUSE_DEPEND_LAST
1348 };
1349
1350 enum omp_clause_proc_bind_kind
1351 {
1352   /* Numbers should match omp_proc_bind_t enum in omp.h.  */
1353   OMP_CLAUSE_PROC_BIND_FALSE = 0,
1354   OMP_CLAUSE_PROC_BIND_TRUE = 1,
1355   OMP_CLAUSE_PROC_BIND_MASTER = 2,
1356   OMP_CLAUSE_PROC_BIND_CLOSE = 3,
1357   OMP_CLAUSE_PROC_BIND_SPREAD = 4,
1358   OMP_CLAUSE_PROC_BIND_LAST
1359 };
1360
1361 enum omp_clause_linear_kind
1362 {
1363   OMP_CLAUSE_LINEAR_DEFAULT,
1364   OMP_CLAUSE_LINEAR_REF,
1365   OMP_CLAUSE_LINEAR_VAL,
1366   OMP_CLAUSE_LINEAR_UVAL
1367 };
1368
1369 struct GTY(()) tree_exp {
1370   struct tree_typed typed;
1371   location_t locus;
1372   tree GTY ((special ("tree_exp"),
1373              desc ("TREE_CODE ((tree) &%0)")))
1374     operands[1];
1375 };
1376
1377 /* Immediate use linking structure.  This structure is used for maintaining
1378    a doubly linked list of uses of an SSA_NAME.  */
1379 struct GTY(()) ssa_use_operand_t {
1380   struct ssa_use_operand_t* GTY((skip(""))) prev;
1381   struct ssa_use_operand_t* GTY((skip(""))) next;
1382   /* Immediate uses for a given SSA name are maintained as a cyclic
1383      list.  To recognize the root of this list, the location field
1384      needs to point to the original SSA name.  Since statements and
1385      SSA names are of different data types, we need this union.  See
1386      the explanation in struct imm_use_iterator.  */
1387   union { gimple *stmt; tree ssa_name; } GTY((skip(""))) loc;
1388   tree *GTY((skip(""))) use;
1389 };
1390
1391 struct GTY(()) tree_ssa_name {
1392   struct tree_typed typed;
1393
1394   /* _DECL wrapped by this SSA name.  */
1395   tree var;
1396
1397   /* Statement that defines this SSA name.  */
1398   gimple *def_stmt;
1399
1400   /* Value range information.  */
1401   union ssa_name_info_type {
1402     /* Pointer attributes used for alias analysis.  */
1403     struct GTY ((tag ("0"))) ptr_info_def *ptr_info;
1404     /* Value range attributes used for zero/sign extension elimination.  */
1405     struct GTY ((tag ("1"))) range_info_def *range_info;
1406   } GTY ((desc ("%1.typed.type ?" \
1407                 "!POINTER_TYPE_P (TREE_TYPE ((tree)&%1)) : 2"))) info;
1408
1409   /* Immediate uses list for this SSA_NAME.  */
1410   struct ssa_use_operand_t imm_uses;
1411 };
1412
1413 struct GTY(()) phi_arg_d {
1414   /* imm_use MUST be the first element in struct because we do some
1415      pointer arithmetic with it.  See phi_arg_index_from_use.  */
1416   struct ssa_use_operand_t imm_use;
1417   tree def;
1418   location_t locus;
1419 };
1420
1421 struct GTY(()) tree_omp_clause {
1422   struct tree_common common;
1423   location_t locus;
1424   enum omp_clause_code code;
1425   union omp_clause_subcode {
1426     enum omp_clause_default_kind   default_kind;
1427     enum omp_clause_schedule_kind  schedule_kind;
1428     enum omp_clause_depend_kind    depend_kind;
1429     /* See include/gomp-constants.h for enum gomp_map_kind's values.  */
1430     unsigned int                   map_kind;
1431     enum omp_clause_proc_bind_kind proc_bind_kind;
1432     enum tree_code                 reduction_code;
1433     enum omp_clause_linear_kind    linear_kind;
1434     enum tree_code                 if_modifier;
1435     /* The dimension a OMP_CLAUSE__GRIDDIM_ clause of a gridified target
1436        construct describes.  */
1437     unsigned int                   dimension;
1438   } GTY ((skip)) subcode;
1439
1440   /* The gimplification of OMP_CLAUSE_REDUCTION_{INIT,MERGE} for omp-low's
1441      usage.  */
1442   gimple_seq gimple_reduction_init;
1443   gimple_seq gimple_reduction_merge;
1444
1445   tree GTY ((length ("omp_clause_num_ops[OMP_CLAUSE_CODE ((tree)&%h)]")))
1446     ops[1];
1447 };
1448
1449 struct GTY(()) tree_block {
1450   struct tree_base base;
1451   tree chain;
1452
1453   unsigned abstract_flag : 1;
1454   unsigned block_num : 31;
1455
1456   location_t locus;
1457   location_t end_locus;
1458
1459   tree vars;
1460   vec<tree, va_gc> *nonlocalized_vars;
1461
1462   tree subblocks;
1463   tree supercontext;
1464   tree abstract_origin;
1465   tree fragment_origin;
1466   tree fragment_chain;
1467
1468   /* Pointer to the DWARF lexical block.  */
1469   struct die_struct *die;
1470 };
1471
1472 struct GTY(()) tree_type_common {
1473   struct tree_common common;
1474   tree size;
1475   tree size_unit;
1476   tree attributes;
1477   unsigned int uid;
1478
1479   unsigned int precision : 10;
1480   unsigned no_force_blk_flag : 1;
1481   unsigned needs_constructing_flag : 1;
1482   unsigned transparent_aggr_flag : 1;
1483   unsigned restrict_flag : 1;
1484   unsigned contains_placeholder_bits : 2;
1485
1486   ENUM_BITFIELD(machine_mode) mode : 8;
1487
1488   unsigned string_flag : 1;
1489   unsigned lang_flag_0 : 1;
1490   unsigned lang_flag_1 : 1;
1491   unsigned lang_flag_2 : 1;
1492   unsigned lang_flag_3 : 1;
1493   unsigned lang_flag_4 : 1;
1494   unsigned lang_flag_5 : 1;
1495   unsigned lang_flag_6 : 1;
1496   unsigned lang_flag_7 : 1;
1497
1498   /* TYPE_ALIGN in log2; this has to be large enough to hold values
1499      of the maximum of BIGGEST_ALIGNMENT and MAX_OFILE_ALIGNMENT,
1500      the latter being usually the larger.  For ELF it is 8<<28,
1501      so we need to store the value 32 (not 31, as we need the zero
1502      as well), hence six bits.  */
1503   unsigned align : 6;
1504   unsigned spare : 25;
1505   alias_set_type alias_set;
1506   tree pointer_to;
1507   tree reference_to;
1508   union tree_type_symtab {
1509     int GTY ((tag ("TYPE_SYMTAB_IS_ADDRESS"))) address;
1510     const char * GTY ((tag ("TYPE_SYMTAB_IS_POINTER"))) pointer;
1511     struct die_struct * GTY ((tag ("TYPE_SYMTAB_IS_DIE"))) die;
1512   } GTY ((desc ("debug_hooks->tree_type_symtab_field"))) symtab;
1513   tree canonical;
1514   tree next_variant;
1515   tree main_variant;
1516   tree context;
1517   tree name;
1518 };
1519
1520 struct GTY(()) tree_type_with_lang_specific {
1521   struct tree_type_common common;
1522   /* Points to a structure whose details depend on the language in use.  */
1523   struct lang_type *lang_specific;
1524 };
1525
1526 struct GTY(()) tree_type_non_common {
1527   struct tree_type_with_lang_specific with_lang_specific;
1528   tree values;
1529   tree minval;
1530   tree maxval;
1531   tree binfo;
1532 };
1533
1534 struct GTY (()) tree_binfo {
1535   struct tree_common common;
1536
1537   tree offset;
1538   tree vtable;
1539   tree virtuals;
1540   tree vptr_field;
1541   vec<tree, va_gc> *base_accesses;
1542   tree inheritance;
1543
1544   tree vtt_subvtt;
1545   tree vtt_vptr;
1546
1547   vec<tree, va_gc> base_binfos;
1548 };
1549
1550 struct GTY(()) tree_decl_minimal {
1551   struct tree_common common;
1552   location_t locus;
1553   unsigned int uid;
1554   tree name;
1555   tree context;
1556 };
1557
1558 struct GTY(()) tree_decl_common {
1559   struct tree_decl_minimal common;
1560   tree size;
1561
1562   ENUM_BITFIELD(machine_mode) mode : 8;
1563
1564   unsigned nonlocal_flag : 1;
1565   unsigned virtual_flag : 1;
1566   unsigned ignored_flag : 1;
1567   unsigned abstract_flag : 1;
1568   unsigned artificial_flag : 1;
1569   unsigned preserve_flag: 1;
1570   unsigned debug_expr_is_from : 1;
1571
1572   unsigned lang_flag_0 : 1;
1573   unsigned lang_flag_1 : 1;
1574   unsigned lang_flag_2 : 1;
1575   unsigned lang_flag_3 : 1;
1576   unsigned lang_flag_4 : 1;
1577   unsigned lang_flag_5 : 1;
1578   unsigned lang_flag_6 : 1;
1579   unsigned lang_flag_7 : 1;
1580   unsigned lang_flag_8 : 1;
1581
1582   /* In VAR_DECL and PARM_DECL, this is DECL_REGISTER.  */
1583   unsigned decl_flag_0 : 1;
1584   /* In FIELD_DECL, this is DECL_BIT_FIELD
1585      In VAR_DECL and FUNCTION_DECL, this is DECL_EXTERNAL.
1586      In TYPE_DECL, this is TYPE_DECL_SUPPRESS_DEBUG.  */
1587   unsigned decl_flag_1 : 1;
1588   /* In FIELD_DECL, this is DECL_NONADDRESSABLE_P
1589      In VAR_DECL, PARM_DECL and RESULT_DECL, this is
1590      DECL_HAS_VALUE_EXPR_P.  */
1591   unsigned decl_flag_2 : 1;
1592   /* 1 bit unused.  */
1593   unsigned decl_flag_3 : 1;
1594   /* Logically, these two would go in a theoretical base shared by var and
1595      parm decl. */
1596   unsigned gimple_reg_flag : 1;
1597   /* In VAR_DECL, PARM_DECL and RESULT_DECL, this is DECL_BY_REFERENCE.  */
1598   unsigned decl_by_reference_flag : 1;
1599   /* In a VAR_DECL and PARM_DECL, this is DECL_READ_P.  */
1600   unsigned decl_read_flag : 1;
1601   /* In a VAR_DECL or RESULT_DECL, this is DECL_NONSHAREABLE.  */
1602   unsigned decl_nonshareable_flag : 1;
1603
1604   /* DECL_OFFSET_ALIGN, used only for FIELD_DECLs.  */
1605   unsigned int off_align : 6;
1606
1607   /* DECL_ALIGN.  It should have the same size as TYPE_ALIGN.  */
1608   unsigned int align : 6;
1609
1610   /* 20 bits unused.  */
1611
1612   /* UID for points-to sets, stable over copying from inlining.  */
1613   unsigned int pt_uid;
1614
1615   tree size_unit;
1616   tree initial;
1617   tree attributes;
1618   tree abstract_origin;
1619
1620   /* Points to a structure whose details depend on the language in use.  */
1621   struct lang_decl *lang_specific;
1622 };
1623
1624 struct GTY(()) tree_decl_with_rtl {
1625   struct tree_decl_common common;
1626   rtx rtl;
1627 };
1628
1629 struct GTY(()) tree_field_decl {
1630   struct tree_decl_common common;
1631
1632   tree offset;
1633   tree bit_field_type;
1634   tree qualifier;
1635   tree bit_offset;
1636   tree fcontext;
1637 };
1638
1639 struct GTY(()) tree_label_decl {
1640   struct tree_decl_with_rtl common;
1641   int label_decl_uid;
1642   int eh_landing_pad_nr;
1643 };
1644
1645 struct GTY(()) tree_result_decl {
1646   struct tree_decl_with_rtl common;
1647 };
1648
1649 struct GTY(()) tree_const_decl {
1650   struct tree_decl_common common;
1651 };
1652
1653 struct GTY(()) tree_parm_decl {
1654   struct tree_decl_with_rtl common;
1655   rtx incoming_rtl;
1656 };
1657
1658 struct GTY(()) tree_decl_with_vis {
1659  struct tree_decl_with_rtl common;
1660  tree assembler_name;
1661  struct symtab_node *symtab_node;
1662
1663  /* Belong to VAR_DECL exclusively.  */
1664  unsigned defer_output : 1;
1665  unsigned hard_register : 1;
1666  unsigned common_flag : 1;
1667  unsigned in_text_section : 1;
1668  unsigned in_constant_pool : 1;
1669  unsigned dllimport_flag : 1;
1670  /* Don't belong to VAR_DECL exclusively.  */
1671  unsigned weak_flag : 1;
1672
1673  unsigned seen_in_bind_expr : 1;
1674  unsigned comdat_flag : 1;
1675  /* Used for FUNCTION_DECL, VAR_DECL and in C++ for TYPE_DECL.  */
1676  ENUM_BITFIELD(symbol_visibility) visibility : 2;
1677  unsigned visibility_specified : 1;
1678
1679  /* Belong to FUNCTION_DECL exclusively.  */
1680  unsigned init_priority_p : 1;
1681  /* Used by C++ only.  Might become a generic decl flag.  */
1682  unsigned shadowed_for_var_p : 1;
1683  /* Belong to FUNCTION_DECL exclusively.  */
1684  unsigned cxx_constructor : 1;
1685  /* Belong to FUNCTION_DECL exclusively.  */
1686  unsigned cxx_destructor : 1;
1687  /* Belong to FUNCTION_DECL exclusively.  */
1688  unsigned final : 1;
1689  /* Belong to FUNCTION_DECL exclusively.  */
1690  unsigned regdecl_flag : 1;
1691  /* 14 unused bits. */
1692 };
1693
1694 struct GTY(()) tree_var_decl {
1695   struct tree_decl_with_vis common;
1696 };
1697
1698 struct GTY(()) tree_decl_non_common {
1699   struct tree_decl_with_vis common;
1700   /* Almost all FE's use this.  */
1701   tree result;
1702 };
1703
1704 /* FUNCTION_DECL inherits from DECL_NON_COMMON because of the use of the
1705    arguments/result/saved_tree fields by front ends.   It was either inherit
1706    FUNCTION_DECL from non_common, or inherit non_common from FUNCTION_DECL,
1707    which seemed a bit strange.  */
1708
1709 struct GTY(()) tree_function_decl {
1710   struct tree_decl_non_common common;
1711
1712   struct function *f;
1713
1714   /* Arguments of the function.  */
1715   tree arguments;
1716   /* The personality function. Used for stack unwinding. */
1717   tree personality;
1718
1719   /* Function specific options that are used by this function.  */
1720   tree function_specific_target;        /* target options */
1721   tree function_specific_optimization;  /* optimization options */
1722
1723   /* Generic function body.  */
1724   tree saved_tree;
1725   /* Index within a virtual table.  */
1726   tree vindex;
1727
1728   /* In a FUNCTION_DECL for which DECL_BUILT_IN holds, this is
1729      DECL_FUNCTION_CODE.  Otherwise unused.
1730      ???  The bitfield needs to be able to hold all target function
1731           codes as well.  */
1732   ENUM_BITFIELD(built_in_function) function_code : 12;
1733   ENUM_BITFIELD(built_in_class) built_in_class : 2;
1734
1735   unsigned static_ctor_flag : 1;
1736   unsigned static_dtor_flag : 1;
1737
1738   unsigned uninlinable : 1;
1739   unsigned possibly_inlined : 1;
1740   unsigned novops_flag : 1;
1741   unsigned returns_twice_flag : 1;
1742   unsigned malloc_flag : 1;
1743   unsigned operator_new_flag : 1;
1744   unsigned declared_inline_flag : 1;
1745   unsigned no_inline_warning_flag : 1;
1746
1747   unsigned no_instrument_function_entry_exit : 1;
1748   unsigned no_limit_stack : 1;
1749   unsigned disregard_inline_limits : 1;
1750   unsigned pure_flag : 1;
1751   unsigned looping_const_or_pure_flag : 1;
1752   unsigned has_debug_args_flag : 1;
1753   unsigned tm_clone_flag : 1;
1754   unsigned versioned_function : 1;
1755   /* No bits left.  */
1756 };
1757
1758 struct GTY(()) tree_translation_unit_decl {
1759   struct tree_decl_common common;
1760   /* Source language of this translation unit.  Used for DWARF output.  */
1761   const char * GTY((skip(""))) language;
1762   /* TODO: Non-optimization used to build this translation unit.  */
1763   /* TODO: Root of a partial DWARF tree for global types and decls.  */
1764 };
1765
1766 struct GTY(()) tree_type_decl {
1767   struct tree_decl_non_common common;
1768
1769 };
1770
1771 struct GTY ((chain_next ("%h.next"), chain_prev ("%h.prev"))) tree_statement_list_node
1772  {
1773   struct tree_statement_list_node *prev;
1774   struct tree_statement_list_node *next;
1775   tree stmt;
1776 };
1777
1778 struct GTY(()) tree_statement_list
1779  {
1780   struct tree_typed typed;
1781   struct tree_statement_list_node *head;
1782   struct tree_statement_list_node *tail;
1783 };
1784
1785
1786 /* Optimization options used by a function.  */
1787
1788 struct GTY(()) tree_optimization_option {
1789   struct tree_common common;
1790
1791   /* The optimization options used by the user.  */
1792   struct cl_optimization *opts;
1793
1794   /* Target optabs for this set of optimization options.  This is of
1795      type `struct target_optabs *'.  */
1796   void *GTY ((atomic)) optabs;
1797
1798   /* The value of this_target_optabs against which the optabs above were
1799      generated.  */
1800   struct target_optabs *GTY ((skip)) base_optabs;
1801 };
1802
1803 /* Forward declaration, defined in target-globals.h.  */
1804
1805 struct GTY(()) target_globals;
1806
1807 /* Target options used by a function.  */
1808
1809 struct GTY(()) tree_target_option {
1810   struct tree_common common;
1811
1812   /* Target globals for the corresponding target option.  */
1813   struct target_globals *globals;
1814
1815   /* The optimization options used by the user.  */
1816   struct cl_target_option *opts;
1817 };
1818
1819 /* Define the overall contents of a tree node.
1820    It may be any of the structures declared above
1821    for various types of node.  */
1822 union GTY ((ptr_alias (union lang_tree_node),
1823             desc ("tree_node_structure (&%h)"), variable_size)) tree_node {
1824   struct tree_base GTY ((tag ("TS_BASE"))) base;
1825   struct tree_typed GTY ((tag ("TS_TYPED"))) typed;
1826   struct tree_common GTY ((tag ("TS_COMMON"))) common;
1827   struct tree_int_cst GTY ((tag ("TS_INT_CST"))) int_cst;
1828   struct tree_real_cst GTY ((tag ("TS_REAL_CST"))) real_cst;
1829   struct tree_fixed_cst GTY ((tag ("TS_FIXED_CST"))) fixed_cst;
1830   struct tree_vector GTY ((tag ("TS_VECTOR"))) vector;
1831   struct tree_string GTY ((tag ("TS_STRING"))) string;
1832   struct tree_complex GTY ((tag ("TS_COMPLEX"))) complex;
1833   struct tree_identifier GTY ((tag ("TS_IDENTIFIER"))) identifier;
1834   struct tree_decl_minimal GTY((tag ("TS_DECL_MINIMAL"))) decl_minimal;
1835   struct tree_decl_common GTY ((tag ("TS_DECL_COMMON"))) decl_common;
1836   struct tree_decl_with_rtl GTY ((tag ("TS_DECL_WRTL"))) decl_with_rtl;
1837   struct tree_decl_non_common  GTY ((tag ("TS_DECL_NON_COMMON")))
1838     decl_non_common;
1839   struct tree_parm_decl  GTY  ((tag ("TS_PARM_DECL"))) parm_decl;
1840   struct tree_decl_with_vis GTY ((tag ("TS_DECL_WITH_VIS"))) decl_with_vis;
1841   struct tree_var_decl GTY ((tag ("TS_VAR_DECL"))) var_decl;
1842   struct tree_field_decl GTY ((tag ("TS_FIELD_DECL"))) field_decl;
1843   struct tree_label_decl GTY ((tag ("TS_LABEL_DECL"))) label_decl;
1844   struct tree_result_decl GTY ((tag ("TS_RESULT_DECL"))) result_decl;
1845   struct tree_const_decl GTY ((tag ("TS_CONST_DECL"))) const_decl;
1846   struct tree_type_decl GTY ((tag ("TS_TYPE_DECL"))) type_decl;
1847   struct tree_function_decl GTY ((tag ("TS_FUNCTION_DECL"))) function_decl;
1848   struct tree_translation_unit_decl GTY ((tag ("TS_TRANSLATION_UNIT_DECL")))
1849     translation_unit_decl;
1850   struct tree_type_common GTY ((tag ("TS_TYPE_COMMON"))) type_common;
1851   struct tree_type_with_lang_specific GTY ((tag ("TS_TYPE_WITH_LANG_SPECIFIC")))
1852     type_with_lang_specific;
1853   struct tree_type_non_common GTY ((tag ("TS_TYPE_NON_COMMON")))
1854     type_non_common;
1855   struct tree_list GTY ((tag ("TS_LIST"))) list;
1856   struct tree_vec GTY ((tag ("TS_VEC"))) vec;
1857   struct tree_exp GTY ((tag ("TS_EXP"))) exp;
1858   struct tree_ssa_name GTY ((tag ("TS_SSA_NAME"))) ssa_name;
1859   struct tree_block GTY ((tag ("TS_BLOCK"))) block;
1860   struct tree_binfo GTY ((tag ("TS_BINFO"))) binfo;
1861   struct tree_statement_list GTY ((tag ("TS_STATEMENT_LIST"))) stmt_list;
1862   struct tree_constructor GTY ((tag ("TS_CONSTRUCTOR"))) constructor;
1863   struct tree_omp_clause GTY ((tag ("TS_OMP_CLAUSE"))) omp_clause;
1864   struct tree_optimization_option GTY ((tag ("TS_OPTIMIZATION"))) optimization;
1865   struct tree_target_option GTY ((tag ("TS_TARGET_OPTION"))) target_option;
1866 };
1867
1868 /* Structure describing an attribute and a function to handle it.  */
1869 struct attribute_spec {
1870   /* The name of the attribute (without any leading or trailing __),
1871      or NULL to mark the end of a table of attributes.  */
1872   const char *name;
1873   /* The minimum length of the list of arguments of the attribute.  */
1874   int min_length;
1875   /* The maximum length of the list of arguments of the attribute
1876      (-1 for no maximum).  */
1877   int max_length;
1878   /* Whether this attribute requires a DECL.  If it does, it will be passed
1879      from types of DECLs, function return types and array element types to
1880      the DECLs, function types and array types respectively; but when
1881      applied to a type in any other circumstances, it will be ignored with
1882      a warning.  (If greater control is desired for a given attribute,
1883      this should be false, and the flags argument to the handler may be
1884      used to gain greater control in that case.)  */
1885   bool decl_required;
1886   /* Whether this attribute requires a type.  If it does, it will be passed
1887      from a DECL to the type of that DECL.  */
1888   bool type_required;
1889   /* Whether this attribute requires a function (or method) type.  If it does,
1890      it will be passed from a function pointer type to the target type,
1891      and from a function return type (which is not itself a function
1892      pointer type) to the function type.  */
1893   bool function_type_required;
1894   /* Function to handle this attribute.  NODE points to the node to which
1895      the attribute is to be applied.  If a DECL, it should be modified in
1896      place; if a TYPE, a copy should be created.  NAME is the name of the
1897      attribute (possibly with leading or trailing __).  ARGS is the TREE_LIST
1898      of the arguments (which may be NULL).  FLAGS gives further information
1899      about the context of the attribute.  Afterwards, the attributes will
1900      be added to the DECL_ATTRIBUTES or TYPE_ATTRIBUTES, as appropriate,
1901      unless *NO_ADD_ATTRS is set to true (which should be done on error,
1902      as well as in any other cases when the attributes should not be added
1903      to the DECL or TYPE).  Depending on FLAGS, any attributes to be
1904      applied to another type or DECL later may be returned;
1905      otherwise the return value should be NULL_TREE.  This pointer may be
1906      NULL if no special handling is required beyond the checks implied
1907      by the rest of this structure.  */
1908   tree (*handler) (tree *node, tree name, tree args,
1909                    int flags, bool *no_add_attrs);
1910   /* Specifies if attribute affects type's identity.  */
1911   bool affects_type_identity;
1912 };
1913
1914 /* These functions allow a front-end to perform a manual layout of a
1915    RECORD_TYPE.  (For instance, if the placement of subsequent fields
1916    depends on the placement of fields so far.)  Begin by calling
1917    start_record_layout.  Then, call place_field for each of the
1918    fields.  Then, call finish_record_layout.  See layout_type for the
1919    default way in which these functions are used.  */
1920 typedef struct record_layout_info_s {
1921   /* The RECORD_TYPE that we are laying out.  */
1922   tree t;
1923   /* The offset into the record so far, in bytes, not including bits in
1924      BITPOS.  */
1925   tree offset;
1926   /* The last known alignment of SIZE.  */
1927   unsigned int offset_align;
1928   /* The bit position within the last OFFSET_ALIGN bits, in bits.  */
1929   tree bitpos;
1930   /* The alignment of the record so far, in bits.  */
1931   unsigned int record_align;
1932   /* The alignment of the record so far, ignoring #pragma pack and
1933      __attribute__ ((packed)), in bits.  */
1934   unsigned int unpacked_align;
1935   /* The previous field laid out.  */
1936   tree prev_field;
1937   /* The static variables (i.e., class variables, as opposed to
1938      instance variables) encountered in T.  */
1939   vec<tree, va_gc> *pending_statics;
1940   /* Bits remaining in the current alignment group */
1941   int remaining_in_alignment;
1942   /* True if we've seen a packed field that didn't have normal
1943      alignment anyway.  */
1944   int packed_maybe_necessary;
1945 } *record_layout_info;
1946
1947 /* Iterator for going through the function arguments.  */
1948 struct function_args_iterator {
1949   tree next;                    /* TREE_LIST pointing to the next argument */
1950 };
1951
1952 /* Structures to map from a tree to another tree.  */
1953 struct GTY(()) tree_map_base {
1954   tree from;
1955 };
1956
1957 /* Map from a tree to another tree.  */
1958
1959 struct GTY((for_user)) tree_map {
1960   struct tree_map_base base;
1961   unsigned int hash;
1962   tree to;
1963 };
1964
1965 /* Map from a decl tree to another tree.  */
1966 struct GTY((for_user)) tree_decl_map {
1967   struct tree_map_base base;
1968   tree to;
1969 };
1970
1971 /* Map from a tree to an int.  */
1972 struct GTY((for_user)) tree_int_map {
1973   struct tree_map_base base;
1974   unsigned int to;
1975 };
1976
1977 /* Map from a decl tree to a tree vector.  */
1978 struct GTY((for_user)) tree_vec_map {
1979   struct tree_map_base base;
1980   vec<tree, va_gc> *to;
1981 };
1982
1983 /* Abstract iterators for CALL_EXPRs.  These static inline definitions
1984    have to go towards the end of tree.h so that union tree_node is fully
1985    defined by this point.  */
1986
1987 /* Structure containing iterator state.  */
1988 struct call_expr_arg_iterator {
1989   tree t;       /* the call_expr */
1990   int n;        /* argument count */
1991   int i;        /* next argument index */
1992 };
1993
1994 struct const_call_expr_arg_iterator {
1995   const_tree t; /* the call_expr */
1996   int n;        /* argument count */
1997   int i;        /* next argument index */
1998 };
1999
2000 /* The builtin_info structure holds the FUNCTION_DECL of the standard builtin
2001    function, and flags.  */
2002 struct GTY(()) builtin_info_type {
2003   tree decl;
2004   /* Whether the user can use <xxx> instead of explicitly using calls
2005      to __builtin_<xxx>.  */
2006   unsigned implicit_p : 1;
2007   /* Whether the user has provided a declaration of <xxx>.  */
2008   unsigned declared_p : 1;
2009 };
2010
2011 /* Information about a _FloatN or _FloatNx type that may be
2012    supported.  */
2013 struct floatn_type_info {
2014   /* The number N in the type name.  */
2015   int n;
2016   /* Whether it is an extended type _FloatNx (true) or an interchange
2017      type (false).  */
2018   bool extended;
2019 };
2020
2021
2022 /*---------------------------------------------------------------------------
2023                                 Global variables
2024 ---------------------------------------------------------------------------*/
2025 /* Matrix describing the structures contained in a given tree code.  */
2026 extern unsigned char tree_contains_struct[MAX_TREE_CODES][64];
2027
2028 /* Class of tree given its code.  */
2029 extern const enum tree_code_class tree_code_type[];
2030
2031 /* Each tree code class has an associated string representation.
2032    These must correspond to the tree_code_class entries.  */
2033 extern const char *const tree_code_class_strings[];
2034
2035 /* Number of argument-words in each kind of tree-node.  */
2036 extern const unsigned char tree_code_length[];
2037
2038 /* Vector of all alias pairs for global symbols.  */
2039 extern GTY(()) vec<alias_pair, va_gc> *alias_pairs;
2040
2041 /* Names of all the built_in classes.  */
2042 extern const char *const built_in_class_names[BUILT_IN_LAST];
2043
2044 /* Names of all the built_in functions.  */
2045 extern const char * built_in_names[(int) END_BUILTINS];
2046
2047 /* Number of operands and names for each OMP_CLAUSE node.  */
2048 extern unsigned const char omp_clause_num_ops[];
2049 extern const char * const omp_clause_code_name[];
2050
2051 /* A vector of all translation-units.  */
2052 extern GTY (()) vec<tree, va_gc> *all_translation_units;
2053
2054 /* Vector of standard trees used by the C compiler.  */
2055 extern GTY(()) tree global_trees[TI_MAX];
2056
2057 /* The standard C integer types.  Use integer_type_kind to index into
2058    this array.  */
2059 extern GTY(()) tree integer_types[itk_none];
2060
2061 /* Types used to represent sizes.  */
2062 extern GTY(()) tree sizetype_tab[(int) stk_type_kind_last];
2063
2064 /* Arrays for keeping track of tree node statistics.  */
2065 extern int tree_node_counts[];
2066 extern int tree_node_sizes[];
2067
2068 /* True if we are in gimple form and the actions of the folders need to
2069    be restricted.  False if we are not in gimple form and folding is not
2070    restricted to creating gimple expressions.  */
2071 extern bool in_gimple_form;
2072
2073 /* Functional interface to the builtin functions.  */
2074 extern GTY(()) builtin_info_type builtin_info[(int)END_BUILTINS];
2075
2076 /* If nonzero, an upper limit on alignment of structure fields, in bits,  */
2077 extern unsigned int maximum_field_alignment;
2078
2079 /* Points to the FUNCTION_DECL of the function whose body we are reading.  */
2080 extern GTY(()) tree current_function_decl;
2081
2082 /* Nonzero means a FUNC_BEGIN label was emitted.  */
2083 extern GTY(()) const char * current_function_func_begin_label;
2084
2085 /* Information about the _FloatN and _FloatNx types.  */
2086 extern const floatn_type_info floatn_nx_types[NUM_FLOATN_NX_TYPES];
2087
2088 #endif  // GCC_TREE_CORE_H