gcc/tree-core.h

   1 /* Core data structures for the 'tree' type.
   2    Copyright (C) 1989-2021 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 /* Nonzero if this is a cold function.  */
  97 #define ECF_COLD                  (1 << 15)
  98
  99 /* Call argument flags.  */
 100 /* Nonzero if the argument is not dereferenced recursively, thus only
 101    directly reachable memory is read or written.  */
 102 #define EAF_DIRECT              (1 << 0)
 103
 104 /* Nonzero if memory reached by the argument is not clobbered.  */
 105 #define EAF_NOCLOBBER           (1 << 1)
 106
 107 /* Nonzero if the argument does not escape.  */
 108 #define EAF_NOESCAPE            (1 << 2)
 109
 110 /* Nonzero if the argument is not used by the function.  */
 111 #define EAF_UNUSED              (1 << 3)
 112
 113 /* Nonzero if the argument itself does not escape but memory
 114    referenced by it can escape.  */
 115 #define EAF_NODIRECTESCAPE      (1 << 4)
 116
 117 /* Call return flags.  */
 118 /* Mask for the argument number that is returned.  Lower two bits of
 119    the return flags, encodes argument slots zero to three.  */
 120 #define ERF_RETURN_ARG_MASK     (3)
 121
 122 /* Nonzero if the return value is equal to the argument number
 123    flags & ERF_RETURN_ARG_MASK.  */
 124 #define ERF_RETURNS_ARG         (1 << 2)
 125
 126 /* Nonzero if the return value does not alias with anything.  Functions
 127    with the malloc attribute have this set on their return value.  */
 128 #define ERF_NOALIAS             (1 << 3)
 129
 130
 131 /*---------------------------------------------------------------------------
 132                                   Enumerations
 133 ---------------------------------------------------------------------------*/
 134 /* Codes of tree nodes.  */
 135 #define DEFTREECODE(SYM, STRING, TYPE, NARGS)   SYM,
 136 #define END_OF_BASE_TREE_CODES LAST_AND_UNUSED_TREE_CODE,
 137
 138 enum tree_code {
 139 #include "all-tree.def"
 140 MAX_TREE_CODES
 141 };
 142
 143 #undef DEFTREECODE
 144 #undef END_OF_BASE_TREE_CODES
 145
 146 /* Number of language-independent tree codes.  */
 147 #define NUM_TREE_CODES \
 148   ((int) LAST_AND_UNUSED_TREE_CODE)
 149
 150 #define CODE_CONTAINS_STRUCT(CODE, STRUCT) \
 151   (tree_contains_struct[(CODE)][(STRUCT)])
 152
 153
 154 /* Classify which part of the compiler has defined a given builtin function.
 155    Note that we assume below that this is no more than two bits.  */
 156 enum built_in_class {
 157   NOT_BUILT_IN = 0,
 158   BUILT_IN_FRONTEND,
 159   BUILT_IN_MD,
 160   BUILT_IN_NORMAL
 161 };
 162
 163 /* Last marker used for LTO stremaing of built_in_class.  We cannot add it
 164    to the enum since we need the enumb to fit in 2 bits.  */
 165 #define BUILT_IN_LAST (BUILT_IN_NORMAL + 1)
 166
 167 /* Codes that identify the various built in functions
 168    so that expand_call can identify them quickly.  */
 169 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) ENUM,
 170 enum built_in_function {
 171 #include "builtins.def"
 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
 190 /* Internal functions.  */
 191 enum internal_fn {
 192 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) IFN_##CODE,
 193 #include "internal-fn.def"
 194   IFN_LAST
 195 };
 196
 197 /* An enum that combines target-independent built-in functions with
 198    internal functions, so that they can be treated in a similar way.
 199    The numbers for built-in functions are the same as for the
 200    built_in_function enum.  The numbers for internal functions
 201    start at END_BUITLINS.  */
 202 enum combined_fn {
 203 #define DEF_BUILTIN(ENUM, N, C, T, LT, B, F, NA, AT, IM, COND) \
 204   CFN_##ENUM = int (ENUM),
 205 #include "builtins.def"
 206
 207
 208 #define DEF_INTERNAL_FN(CODE, FLAGS, FNSPEC) \
 209   CFN_##CODE = int (END_BUILTINS) + int (IFN_##CODE),
 210 #include "internal-fn.def"
 211
 212   CFN_LAST
 213 };
 214
 215 /* Tree code classes.  Each tree_code has an associated code class
 216    represented by a TREE_CODE_CLASS.  */
 217 enum tree_code_class {
 218   tcc_exceptional, /* An exceptional code (fits no category).  */
 219   tcc_constant,    /* A constant.  */
 220   /* Order of tcc_type and tcc_declaration is important.  */
 221   tcc_type,        /* A type object code.  */
 222   tcc_declaration, /* A declaration (also serving as variable refs).  */
 223   tcc_reference,   /* A reference to storage.  */
 224   tcc_comparison,  /* A comparison expression.  */
 225   tcc_unary,       /* A unary arithmetic expression.  */
 226   tcc_binary,      /* A binary arithmetic expression.  */
 227   tcc_statement,   /* A statement expression, which have side effects
 228                       but usually no interesting value.  */
 229   tcc_vl_exp,      /* A function call or other expression with a
 230                       variable-length operand vector.  */
 231   tcc_expression   /* Any other expression.  */
 232 };
 233
 234 /* OMP_CLAUSE codes.  Do not reorder, as this is used to index into
 235    the tables omp_clause_num_ops and omp_clause_code_name.  */
 236 enum omp_clause_code {
 237   /* Clause zero is special-cased inside the parser
 238      (c_parser_omp_variable_list).  */
 239   OMP_CLAUSE_ERROR = 0,
 240
 241   /* OpenACC/OpenMP clause: private (variable_list).  */
 242   OMP_CLAUSE_PRIVATE,
 243
 244   /* OpenMP clause: shared (variable_list).  */
 245   OMP_CLAUSE_SHARED,
 246
 247   /* OpenACC/OpenMP clause: firstprivate (variable_list).  */
 248   OMP_CLAUSE_FIRSTPRIVATE,
 249
 250   /* OpenMP clause: lastprivate (variable_list).  */
 251   OMP_CLAUSE_LASTPRIVATE,
 252
 253   /* OpenACC/OpenMP clause: reduction (operator:variable_list).
 254      OMP_CLAUSE_REDUCTION_CODE: The tree_code of the operator.
 255      Operand 1: OMP_CLAUSE_REDUCTION_INIT: Stmt-list to initialize the var.
 256      Operand 2: OMP_CLAUSE_REDUCTION_MERGE: Stmt-list to merge private var
 257                 into the shared one.
 258      Operand 3: OMP_CLAUSE_REDUCTION_PLACEHOLDER: A dummy VAR_DECL
 259                 placeholder used in OMP_CLAUSE_REDUCTION_{INIT,MERGE}.
 260      Operand 4: OMP_CLAUSE_REDUCTION_DECL_PLACEHOLDER: Another dummy
 261                 VAR_DECL placeholder, used like the above for C/C++ array
 262                 reductions.  */
 263   OMP_CLAUSE_REDUCTION,
 264
 265   /* OpenMP clause: task_reduction (operator:variable_list).  */
 266   OMP_CLAUSE_TASK_REDUCTION,
 267
 268   /* OpenMP clause: in_reduction (operator:variable_list).  */
 269   OMP_CLAUSE_IN_REDUCTION,
 270
 271   /* OpenMP clause: copyin (variable_list).  */
 272   OMP_CLAUSE_COPYIN,
 273
 274   /* OpenMP clause: copyprivate (variable_list).  */
 275   OMP_CLAUSE_COPYPRIVATE,
 276
 277   /* OpenMP clause: linear (variable-list[:linear-step]).  */
 278   OMP_CLAUSE_LINEAR,
 279
 280   /* OpenMP clause: aligned (variable-list[:alignment]).  */
 281   OMP_CLAUSE_ALIGNED,
 282
 283   /* OpenMP clause: allocate ([allocator:]variable-list).  */
 284   OMP_CLAUSE_ALLOCATE,
 285
 286   /* OpenMP clause: depend ({in,out,inout}:variable-list).  */
 287   OMP_CLAUSE_DEPEND,
 288
 289   /* OpenMP clause: nontemporal (variable-list).  */
 290   OMP_CLAUSE_NONTEMPORAL,
 291
 292   /* OpenMP clause: uniform (argument-list).  */
 293   OMP_CLAUSE_UNIFORM,
 294
 295   /* OpenMP clause: to (extended-list).
 296      Only when it appears in declare target.  */
 297   OMP_CLAUSE_TO_DECLARE,
 298
 299   /* OpenMP clause: link (variable-list).  */
 300   OMP_CLAUSE_LINK,
 301
 302   /* OpenMP clause: from (variable-list).  */
 303   OMP_CLAUSE_FROM,
 304
 305   /* OpenMP clause: to (variable-list).  */
 306   OMP_CLAUSE_TO,
 307
 308   /* OpenACC clauses: {copy, copyin, copyout, create, delete, deviceptr,
 309      device, host (self), present, present_or_copy (pcopy), present_or_copyin
 310      (pcopyin), present_or_copyout (pcopyout), present_or_create (pcreate)}
 311      (variable-list).
 312
 313      OpenMP clause: map ({alloc:,to:,from:,tofrom:,}variable-list).  */
 314   OMP_CLAUSE_MAP,
 315
 316   /* OpenACC clause: use_device (variable-list).
 317      OpenMP clause: use_device_ptr (ptr-list).  */
 318   OMP_CLAUSE_USE_DEVICE_PTR,
 319
 320   /* OpenMP clause: use_device_addr (variable-list).  */
 321   OMP_CLAUSE_USE_DEVICE_ADDR,
 322
 323   /* OpenMP clause: is_device_ptr (variable-list).  */
 324   OMP_CLAUSE_IS_DEVICE_PTR,
 325
 326   /* OpenMP clause: inclusive (variable-list).  */
 327   OMP_CLAUSE_INCLUSIVE,
 328
 329   /* OpenMP clause: exclusive (variable-list).  */
 330   OMP_CLAUSE_EXCLUSIVE,
 331
 332   /* Internal structure to hold OpenACC cache directive's variable-list.
 333      #pragma acc cache (variable-list).  */
 334   OMP_CLAUSE__CACHE_,
 335
 336   /* OpenACC clause: gang [(gang-argument-list)].
 337      Where
 338       gang-argument-list: [gang-argument-list, ] gang-argument
 339       gang-argument: [num:] integer-expression
 340                    | static: size-expression
 341       size-expression: * | integer-expression.  */
 342   OMP_CLAUSE_GANG,
 343
 344   /* OpenACC clause: async [(integer-expression)].  */
 345   OMP_CLAUSE_ASYNC,
 346
 347   /* OpenACC clause: wait [(integer-expression-list)].  */
 348   OMP_CLAUSE_WAIT,
 349
 350   /* OpenACC clause: auto.  */
 351   OMP_CLAUSE_AUTO,
 352
 353   /* OpenACC clause: seq.  */
 354   OMP_CLAUSE_SEQ,
 355
 356   /* Internal clause: temporary for combined loops expansion.  */
 357   OMP_CLAUSE__LOOPTEMP_,
 358
 359   /* Internal clause: temporary for task reductions.  */
 360   OMP_CLAUSE__REDUCTEMP_,
 361
 362   /* Internal clause: temporary for lastprivate(conditional:).  */
 363   OMP_CLAUSE__CONDTEMP_,
 364
 365   /* Internal clause: temporary for inscan reductions.  */
 366   OMP_CLAUSE__SCANTEMP_,
 367
 368   /* OpenACC/OpenMP clause: if (scalar-expression).  */
 369   OMP_CLAUSE_IF,
 370
 371   /* OpenMP clause: num_threads (integer-expression).  */
 372   OMP_CLAUSE_NUM_THREADS,
 373
 374   /* OpenMP clause: schedule.  */
 375   OMP_CLAUSE_SCHEDULE,
 376
 377   /* OpenMP clause: nowait.  */
 378   OMP_CLAUSE_NOWAIT,
 379
 380   /* OpenMP clause: ordered [(constant-integer-expression)].  */
 381   OMP_CLAUSE_ORDERED,
 382
 383   /* OpenACC/OpenMP clause: default.  */
 384   OMP_CLAUSE_DEFAULT,
 385
 386   /* OpenACC/OpenMP clause: collapse (constant-integer-expression).  */
 387   OMP_CLAUSE_COLLAPSE,
 388
 389   /* OpenMP clause: untied.  */
 390   OMP_CLAUSE_UNTIED,
 391
 392   /* OpenMP clause: final (scalar-expression).  */
 393   OMP_CLAUSE_FINAL,
 394
 395   /* OpenMP clause: mergeable.  */
 396   OMP_CLAUSE_MERGEABLE,
 397
 398   /* OpenMP clause: device (integer-expression).  */
 399   OMP_CLAUSE_DEVICE,
 400
 401   /* OpenMP clause: dist_schedule (static[:chunk-size]).  */
 402   OMP_CLAUSE_DIST_SCHEDULE,
 403
 404   /* OpenMP clause: inbranch.  */
 405   OMP_CLAUSE_INBRANCH,
 406
 407   /* OpenMP clause: notinbranch.  */
 408   OMP_CLAUSE_NOTINBRANCH,
 409
 410   /* OpenMP clause: num_teams(integer-expression).  */
 411   OMP_CLAUSE_NUM_TEAMS,
 412
 413   /* OpenMP clause: thread_limit(integer-expression).  */
 414   OMP_CLAUSE_THREAD_LIMIT,
 415
 416   /* OpenMP clause: proc_bind ({master,close,spread}).  */
 417   OMP_CLAUSE_PROC_BIND,
 418
 419   /* OpenMP clause: safelen (constant-integer-expression).  */
 420   OMP_CLAUSE_SAFELEN,
 421
 422   /* OpenMP clause: simdlen (constant-integer-expression).  */
 423   OMP_CLAUSE_SIMDLEN,
 424
 425   /* OpenMP clause: device_type ({host,nohost,any}).  */
 426   OMP_CLAUSE_DEVICE_TYPE,
 427
 428   /* OpenMP clause: for.  */
 429   OMP_CLAUSE_FOR,
 430
 431   /* OpenMP clause: parallel.  */
 432   OMP_CLAUSE_PARALLEL,
 433
 434   /* OpenMP clause: sections.  */
 435   OMP_CLAUSE_SECTIONS,
 436
 437   /* OpenMP clause: taskgroup.  */
 438   OMP_CLAUSE_TASKGROUP,
 439
 440   /* OpenMP clause: priority (integer-expression).  */
 441   OMP_CLAUSE_PRIORITY,
 442
 443   /* OpenMP clause: grainsize (integer-expression).  */
 444   OMP_CLAUSE_GRAINSIZE,
 445
 446   /* OpenMP clause: num_tasks (integer-expression).  */
 447   OMP_CLAUSE_NUM_TASKS,
 448
 449   /* OpenMP clause: nogroup.  */
 450   OMP_CLAUSE_NOGROUP,
 451
 452   /* OpenMP clause: threads.  */
 453   OMP_CLAUSE_THREADS,
 454
 455   /* OpenMP clause: simd.  */
 456   OMP_CLAUSE_SIMD,
 457
 458   /* OpenMP clause: hint (integer-expression).  */
 459   OMP_CLAUSE_HINT,
 460
 461   /* OpenMP clause: defaultmap (tofrom: scalar).  */
 462   OMP_CLAUSE_DEFAULTMAP,
 463
 464   /* OpenMP clause: order (concurrent).  */
 465   OMP_CLAUSE_ORDER,
 466
 467   /* OpenMP clause: bind (binding).  */
 468   OMP_CLAUSE_BIND,
 469
 470   /* Internally used only clause, holding SIMD uid.  */
 471   OMP_CLAUSE__SIMDUID_,
 472
 473   /* Internally used only clause, flag whether this is SIMT simd
 474      loop or not.  */
 475   OMP_CLAUSE__SIMT_,
 476
 477   /* OpenACC clause: independent.  */
 478   OMP_CLAUSE_INDEPENDENT,
 479
 480   /* OpenACC clause: worker [( [num:] integer-expression)].  */
 481   OMP_CLAUSE_WORKER,
 482
 483   /* OpenACC clause: vector [( [length:] integer-expression)].  */
 484   OMP_CLAUSE_VECTOR,
 485
 486   /* OpenACC clause: num_gangs (integer-expression).  */
 487   OMP_CLAUSE_NUM_GANGS,
 488
 489   /* OpenACC clause: num_workers (integer-expression).  */
 490   OMP_CLAUSE_NUM_WORKERS,
 491
 492   /* OpenACC clause: vector_length (integer-expression).  */
 493   OMP_CLAUSE_VECTOR_LENGTH,
 494
 495   /* OpenACC clause: tile ( size-expr-list ).  */
 496   OMP_CLAUSE_TILE,
 497
 498   /* OpenACC clause: if_present.  */
 499   OMP_CLAUSE_IF_PRESENT,
 500
 501   /* OpenACC clause: finalize.  */
 502   OMP_CLAUSE_FINALIZE
 503 };
 504
 505 #undef DEFTREESTRUCT
 506 #define DEFTREESTRUCT(ENUM, NAME) ENUM,
 507 enum tree_node_structure_enum {
 508 #include "treestruct.def"
 509   LAST_TS_ENUM
 510 };
 511 #undef DEFTREESTRUCT
 512
 513 enum omp_clause_schedule_kind {
 514   OMP_CLAUSE_SCHEDULE_STATIC,
 515   OMP_CLAUSE_SCHEDULE_DYNAMIC,
 516   OMP_CLAUSE_SCHEDULE_GUIDED,
 517   OMP_CLAUSE_SCHEDULE_AUTO,
 518   OMP_CLAUSE_SCHEDULE_RUNTIME,
 519   OMP_CLAUSE_SCHEDULE_MASK = (1 << 3) - 1,
 520   OMP_CLAUSE_SCHEDULE_MONOTONIC = (1 << 3),
 521   OMP_CLAUSE_SCHEDULE_NONMONOTONIC = (1 << 4),
 522   OMP_CLAUSE_SCHEDULE_LAST = 2 * OMP_CLAUSE_SCHEDULE_NONMONOTONIC - 1
 523 };
 524
 525 enum omp_clause_default_kind {
 526   OMP_CLAUSE_DEFAULT_UNSPECIFIED,
 527   OMP_CLAUSE_DEFAULT_SHARED,
 528   OMP_CLAUSE_DEFAULT_NONE,
 529   OMP_CLAUSE_DEFAULT_PRIVATE,
 530   OMP_CLAUSE_DEFAULT_FIRSTPRIVATE,
 531   OMP_CLAUSE_DEFAULT_PRESENT,
 532   OMP_CLAUSE_DEFAULT_LAST
 533 };
 534
 535 enum omp_clause_defaultmap_kind {
 536   OMP_CLAUSE_DEFAULTMAP_CATEGORY_UNSPECIFIED,
 537   OMP_CLAUSE_DEFAULTMAP_CATEGORY_SCALAR,
 538   OMP_CLAUSE_DEFAULTMAP_CATEGORY_AGGREGATE,
 539   OMP_CLAUSE_DEFAULTMAP_CATEGORY_ALLOCATABLE,
 540   OMP_CLAUSE_DEFAULTMAP_CATEGORY_POINTER,
 541   OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK = 7,
 542   OMP_CLAUSE_DEFAULTMAP_ALLOC = 1 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 543   OMP_CLAUSE_DEFAULTMAP_TO = 2 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 544   OMP_CLAUSE_DEFAULTMAP_FROM = 3 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 545   OMP_CLAUSE_DEFAULTMAP_TOFROM = 4 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 546   OMP_CLAUSE_DEFAULTMAP_FIRSTPRIVATE
 547     = 5 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 548   OMP_CLAUSE_DEFAULTMAP_NONE = 6 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 549   OMP_CLAUSE_DEFAULTMAP_DEFAULT
 550     = 7 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 551   OMP_CLAUSE_DEFAULTMAP_MASK = 7 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1)
 552 };
 553
 554 enum omp_clause_bind_kind {
 555   OMP_CLAUSE_BIND_TEAMS,
 556   OMP_CLAUSE_BIND_PARALLEL,
 557   OMP_CLAUSE_BIND_THREAD
 558 };
 559
 560 /* memory-order-clause on OpenMP atomic/flush constructs or
 561    argument of atomic_default_mem_order clause.  */
 562 enum omp_memory_order {
 563   OMP_MEMORY_ORDER_UNSPECIFIED,
 564   OMP_MEMORY_ORDER_RELAXED,
 565   OMP_MEMORY_ORDER_ACQUIRE,
 566   OMP_MEMORY_ORDER_RELEASE,
 567   OMP_MEMORY_ORDER_ACQ_REL,
 568   OMP_MEMORY_ORDER_SEQ_CST
 569 };
 570
 571 /* There is a TYPE_QUAL value for each type qualifier.  They can be
 572    combined by bitwise-or to form the complete set of qualifiers for a
 573    type.  */
 574 enum cv_qualifier {
 575   TYPE_UNQUALIFIED   = 0x0,
 576   TYPE_QUAL_CONST    = 0x1,
 577   TYPE_QUAL_VOLATILE = 0x2,
 578   TYPE_QUAL_RESTRICT = 0x4,
 579   TYPE_QUAL_ATOMIC   = 0x8
 580 };
 581
 582 /* Standard named or nameless data types of the C compiler.  */
 583 enum tree_index {
 584   TI_ERROR_MARK,
 585   TI_INTQI_TYPE,
 586   TI_INTHI_TYPE,
 587   TI_INTSI_TYPE,
 588   TI_INTDI_TYPE,
 589   TI_INTTI_TYPE,
 590
 591   TI_UINTQI_TYPE,
 592   TI_UINTHI_TYPE,
 593   TI_UINTSI_TYPE,
 594   TI_UINTDI_TYPE,
 595   TI_UINTTI_TYPE,
 596
 597   TI_ATOMICQI_TYPE,
 598   TI_ATOMICHI_TYPE,
 599   TI_ATOMICSI_TYPE,
 600   TI_ATOMICDI_TYPE,
 601   TI_ATOMICTI_TYPE,
 602
 603   TI_UINT16_TYPE,
 604   TI_UINT32_TYPE,
 605   TI_UINT64_TYPE,
 606   TI_UINT128_TYPE,
 607
 608   TI_VOID,
 609
 610   TI_INTEGER_ZERO,
 611   TI_INTEGER_ONE,
 612   TI_INTEGER_THREE,
 613   TI_INTEGER_MINUS_ONE,
 614   TI_NULL_POINTER,
 615
 616   TI_SIZE_ZERO,
 617   TI_SIZE_ONE,
 618
 619   TI_BITSIZE_ZERO,
 620   TI_BITSIZE_ONE,
 621   TI_BITSIZE_UNIT,
 622
 623   TI_PUBLIC,
 624   TI_PROTECTED,
 625   TI_PRIVATE,
 626
 627   TI_BOOLEAN_FALSE,
 628   TI_BOOLEAN_TRUE,
 629
 630   TI_FLOAT_TYPE,
 631   TI_DOUBLE_TYPE,
 632   TI_LONG_DOUBLE_TYPE,
 633
 634   /* The _FloatN and _FloatNx types must be consecutive, and in the
 635      same sequence as the corresponding complex types, which must also
 636      be consecutive; _FloatN must come before _FloatNx; the order must
 637      also be the same as in the floatn_nx_types array and the RID_*
 638      values in c-common.h.  This is so that iterations over these
 639      types work as intended.  */
 640   TI_FLOAT16_TYPE,
 641   TI_FLOATN_TYPE_FIRST = TI_FLOAT16_TYPE,
 642   TI_FLOATN_NX_TYPE_FIRST = TI_FLOAT16_TYPE,
 643   TI_FLOAT32_TYPE,
 644   TI_FLOAT64_TYPE,
 645   TI_FLOAT128_TYPE,
 646   TI_FLOATN_TYPE_LAST = TI_FLOAT128_TYPE,
 647 #define NUM_FLOATN_TYPES (TI_FLOATN_TYPE_LAST - TI_FLOATN_TYPE_FIRST + 1)
 648   TI_FLOAT32X_TYPE,
 649   TI_FLOATNX_TYPE_FIRST = TI_FLOAT32X_TYPE,
 650   TI_FLOAT64X_TYPE,
 651   TI_FLOAT128X_TYPE,
 652   TI_FLOATNX_TYPE_LAST = TI_FLOAT128X_TYPE,
 653   TI_FLOATN_NX_TYPE_LAST = TI_FLOAT128X_TYPE,
 654 #define NUM_FLOATNX_TYPES (TI_FLOATNX_TYPE_LAST - TI_FLOATNX_TYPE_FIRST + 1)
 655 #define NUM_FLOATN_NX_TYPES (TI_FLOATN_NX_TYPE_LAST             \
 656                              - TI_FLOATN_NX_TYPE_FIRST          \
 657                              + 1)
 658
 659   /* Put the complex types after their component types, so that in (sequential)
 660      tree streaming we can assert that their component types have already been
 661      handled (see tree-streamer.c:record_common_node).  */
 662   TI_COMPLEX_INTEGER_TYPE,
 663   TI_COMPLEX_FLOAT_TYPE,
 664   TI_COMPLEX_DOUBLE_TYPE,
 665   TI_COMPLEX_LONG_DOUBLE_TYPE,
 666
 667   TI_COMPLEX_FLOAT16_TYPE,
 668   TI_COMPLEX_FLOATN_NX_TYPE_FIRST = TI_COMPLEX_FLOAT16_TYPE,
 669   TI_COMPLEX_FLOAT32_TYPE,
 670   TI_COMPLEX_FLOAT64_TYPE,
 671   TI_COMPLEX_FLOAT128_TYPE,
 672   TI_COMPLEX_FLOAT32X_TYPE,
 673   TI_COMPLEX_FLOAT64X_TYPE,
 674   TI_COMPLEX_FLOAT128X_TYPE,
 675
 676   TI_FLOAT_PTR_TYPE,
 677   TI_DOUBLE_PTR_TYPE,
 678   TI_LONG_DOUBLE_PTR_TYPE,
 679   TI_INTEGER_PTR_TYPE,
 680
 681   TI_VOID_TYPE,
 682   TI_PTR_TYPE,
 683   TI_CONST_PTR_TYPE,
 684   TI_SIZE_TYPE,
 685   TI_PID_TYPE,
 686   TI_PTRDIFF_TYPE,
 687   TI_VA_LIST_TYPE,
 688   TI_VA_LIST_GPR_COUNTER_FIELD,
 689   TI_VA_LIST_FPR_COUNTER_FIELD,
 690   TI_BOOLEAN_TYPE,
 691   TI_FILEPTR_TYPE,
 692   TI_CONST_TM_PTR_TYPE,
 693   TI_FENV_T_PTR_TYPE,
 694   TI_CONST_FENV_T_PTR_TYPE,
 695   TI_FEXCEPT_T_PTR_TYPE,
 696   TI_CONST_FEXCEPT_T_PTR_TYPE,
 697   TI_POINTER_SIZED_TYPE,
 698
 699   TI_DFLOAT32_TYPE,
 700   TI_DFLOAT64_TYPE,
 701   TI_DFLOAT128_TYPE,
 702
 703   TI_VOID_LIST_NODE,
 704
 705   TI_MAIN_IDENTIFIER,
 706
 707   TI_SAT_SFRACT_TYPE,
 708   TI_SAT_FRACT_TYPE,
 709   TI_SAT_LFRACT_TYPE,
 710   TI_SAT_LLFRACT_TYPE,
 711   TI_SAT_USFRACT_TYPE,
 712   TI_SAT_UFRACT_TYPE,
 713   TI_SAT_ULFRACT_TYPE,
 714   TI_SAT_ULLFRACT_TYPE,
 715   TI_SFRACT_TYPE,
 716   TI_FRACT_TYPE,
 717   TI_LFRACT_TYPE,
 718   TI_LLFRACT_TYPE,
 719   TI_USFRACT_TYPE,
 720   TI_UFRACT_TYPE,
 721   TI_ULFRACT_TYPE,
 722   TI_ULLFRACT_TYPE,
 723   TI_SAT_SACCUM_TYPE,
 724   TI_SAT_ACCUM_TYPE,
 725   TI_SAT_LACCUM_TYPE,
 726   TI_SAT_LLACCUM_TYPE,
 727   TI_SAT_USACCUM_TYPE,
 728   TI_SAT_UACCUM_TYPE,
 729   TI_SAT_ULACCUM_TYPE,
 730   TI_SAT_ULLACCUM_TYPE,
 731   TI_SACCUM_TYPE,
 732   TI_ACCUM_TYPE,
 733   TI_LACCUM_TYPE,
 734   TI_LLACCUM_TYPE,
 735   TI_USACCUM_TYPE,
 736   TI_UACCUM_TYPE,
 737   TI_ULACCUM_TYPE,
 738   TI_ULLACCUM_TYPE,
 739   TI_QQ_TYPE,
 740   TI_HQ_TYPE,
 741   TI_SQ_TYPE,
 742   TI_DQ_TYPE,
 743   TI_TQ_TYPE,
 744   TI_UQQ_TYPE,
 745   TI_UHQ_TYPE,
 746   TI_USQ_TYPE,
 747   TI_UDQ_TYPE,
 748   TI_UTQ_TYPE,
 749   TI_SAT_QQ_TYPE,
 750   TI_SAT_HQ_TYPE,
 751   TI_SAT_SQ_TYPE,
 752   TI_SAT_DQ_TYPE,
 753   TI_SAT_TQ_TYPE,
 754   TI_SAT_UQQ_TYPE,
 755   TI_SAT_UHQ_TYPE,
 756   TI_SAT_USQ_TYPE,
 757   TI_SAT_UDQ_TYPE,
 758   TI_SAT_UTQ_TYPE,
 759   TI_HA_TYPE,
 760   TI_SA_TYPE,
 761   TI_DA_TYPE,
 762   TI_TA_TYPE,
 763   TI_UHA_TYPE,
 764   TI_USA_TYPE,
 765   TI_UDA_TYPE,
 766   TI_UTA_TYPE,
 767   TI_SAT_HA_TYPE,
 768   TI_SAT_SA_TYPE,
 769   TI_SAT_DA_TYPE,
 770   TI_SAT_TA_TYPE,
 771   TI_SAT_UHA_TYPE,
 772   TI_SAT_USA_TYPE,
 773   TI_SAT_UDA_TYPE,
 774   TI_SAT_UTA_TYPE,
 775
 776   TI_MODULE_HWM,
 777   /* Nodes below here change during compilation, and should therefore
 778      not be in the C++ module's global tree table.  */
 779
 780   TI_OPTIMIZATION_DEFAULT,
 781   TI_OPTIMIZATION_CURRENT,
 782   TI_TARGET_OPTION_DEFAULT,
 783   TI_TARGET_OPTION_CURRENT,
 784   TI_CURRENT_TARGET_PRAGMA,
 785   TI_CURRENT_OPTIMIZE_PRAGMA,
 786
 787   TI_CHREC_DONT_KNOW,
 788   TI_CHREC_KNOWN,
 789
 790   TI_MAX
 791 };
 792
 793 /* An enumeration of the standard C integer types.  These must be
 794    ordered so that shorter types appear before longer ones, and so
 795    that signed types appear before unsigned ones, for the correct
 796    functioning of interpret_integer() in c-lex.c.  */
 797 enum integer_type_kind {
 798   itk_char,
 799   itk_signed_char,
 800   itk_unsigned_char,
 801   itk_short,
 802   itk_unsigned_short,
 803   itk_int,
 804   itk_unsigned_int,
 805   itk_long,
 806   itk_unsigned_long,
 807   itk_long_long,
 808   itk_unsigned_long_long,
 809
 810   itk_intN_0,
 811   itk_unsigned_intN_0,
 812   itk_intN_1,
 813   itk_unsigned_intN_1,
 814   itk_intN_2,
 815   itk_unsigned_intN_2,
 816   itk_intN_3,
 817   itk_unsigned_intN_3,
 818
 819   itk_none
 820 };
 821
 822 /* A pointer-to-function member type looks like:
 823
 824      struct {
 825        __P __pfn;
 826        ptrdiff_t __delta;
 827      };
 828
 829    If __pfn is NULL, it is a NULL pointer-to-member-function.
 830
 831    (Because the vtable is always the first thing in the object, we
 832    don't need its offset.)  If the function is virtual, then PFN is
 833    one plus twice the index into the vtable; otherwise, it is just a
 834    pointer to the function.
 835
 836    Unfortunately, using the lowest bit of PFN doesn't work in
 837    architectures that don't impose alignment requirements on function
 838    addresses, or that use the lowest bit to tell one ISA from another,
 839    for example.  For such architectures, we use the lowest bit of
 840    DELTA instead of the lowest bit of the PFN, and DELTA will be
 841    multiplied by 2.  */
 842 enum ptrmemfunc_vbit_where_t {
 843   ptrmemfunc_vbit_in_pfn,
 844   ptrmemfunc_vbit_in_delta
 845 };
 846
 847 /* Flags that may be passed in the third argument of decl_attributes, and
 848    to handler functions for attributes.  */
 849 enum attribute_flags {
 850   /* The type passed in is the type of a DECL, and any attributes that
 851      should be passed in again to be applied to the DECL rather than the
 852      type should be returned.  */
 853   ATTR_FLAG_DECL_NEXT = 1,
 854   /* The type passed in is a function return type, and any attributes that
 855      should be passed in again to be applied to the function type rather
 856      than the return type should be returned.  */
 857   ATTR_FLAG_FUNCTION_NEXT = 2,
 858   /* The type passed in is an array element type, and any attributes that
 859      should be passed in again to be applied to the array type rather
 860      than the element type should be returned.  */
 861   ATTR_FLAG_ARRAY_NEXT = 4,
 862   /* The type passed in is a structure, union or enumeration type being
 863      created, and should be modified in place.  */
 864   ATTR_FLAG_TYPE_IN_PLACE = 8,
 865   /* The attributes are being applied by default to a library function whose
 866      name indicates known behavior, and should be silently ignored if they
 867      are not in fact compatible with the function type.  */
 868   ATTR_FLAG_BUILT_IN = 16,
 869   /* A given attribute has been parsed as a C++-11 attribute.  */
 870   ATTR_FLAG_CXX11 = 32,
 871   /* The attribute handler is being invoked with an internal argument
 872      that may not otherwise be valid when specified in source code.  */
 873   ATTR_FLAG_INTERNAL = 64
 874 };
 875
 876 /* Types used to represent sizes.  */
 877 enum size_type_kind {
 878   stk_sizetype,         /* Normal representation of sizes in bytes.  */
 879   stk_ssizetype,        /* Signed representation of sizes in bytes.  */
 880   stk_bitsizetype,      /* Normal representation of sizes in bits.  */
 881   stk_sbitsizetype,     /* Signed representation of sizes in bits.  */
 882   stk_type_kind_last
 883 };
 884
 885 enum operand_equal_flag {
 886   OEP_ONLY_CONST = 1,
 887   OEP_PURE_SAME = 2,
 888   OEP_MATCH_SIDE_EFFECTS = 4,
 889   OEP_ADDRESS_OF = 8,
 890   /* Internal within operand_equal_p:  */
 891   OEP_NO_HASH_CHECK = 16,
 892   /* Internal within inchash::add_expr:  */
 893   OEP_HASH_CHECK = 32,
 894   /* Makes operand_equal_p handle more expressions:  */
 895   OEP_LEXICOGRAPHIC = 64,
 896   OEP_BITWISE = 128
 897 };
 898
 899 /* Enum and arrays used for tree allocation stats.
 900    Keep in sync with tree.c:tree_node_kind_names.  */
 901 enum tree_node_kind {
 902   d_kind,
 903   t_kind,
 904   b_kind,
 905   s_kind,
 906   r_kind,
 907   e_kind,
 908   c_kind,
 909   id_kind,
 910   vec_kind,
 911   binfo_kind,
 912   ssa_name_kind,
 913   constr_kind,
 914   x_kind,
 915   lang_decl,
 916   lang_type,
 917   omp_clause_kind,
 918   all_kinds
 919 };
 920
 921 enum annot_expr_kind {
 922   annot_expr_ivdep_kind,
 923   annot_expr_unroll_kind,
 924   annot_expr_no_vector_kind,
 925   annot_expr_vector_kind,
 926   annot_expr_parallel_kind,
 927   annot_expr_kind_last
 928 };
 929
 930 /*---------------------------------------------------------------------------
 931                                 Type definitions
 932 ---------------------------------------------------------------------------*/
 933 /* When processing aliases at the symbol table level, we need the
 934    declaration of target. For this reason we need to queue aliases and
 935    process them after all declarations has been produced.  */
 936 struct GTY(()) alias_pair {
 937   tree decl;
 938   tree target;
 939 };
 940
 941 /* An initialization priority.  */
 942 typedef unsigned short priority_type;
 943
 944 /* The type of a callback function for walking over tree structure.  */
 945 typedef tree (*walk_tree_fn) (tree *, int *, void *);
 946
 947 /* The type of a callback function that represents a custom walk_tree.  */
 948 typedef tree (*walk_tree_lh) (tree *, int *, tree (*) (tree *, int *, void *),
 949                               void *, hash_set<tree> *);
 950
 951
 952 /*---------------------------------------------------------------------------
 953                               Main data structures
 954 ---------------------------------------------------------------------------*/
 955 /* A tree node can represent a data type, a variable, an expression
 956    or a statement.  Each node has a TREE_CODE which says what kind of
 957    thing it represents.  Some common codes are:
 958    INTEGER_TYPE -- represents a type of integers.
 959    ARRAY_TYPE -- represents a type of pointer.
 960    VAR_DECL -- represents a declared variable.
 961    INTEGER_CST -- represents a constant integer value.
 962    PLUS_EXPR -- represents a sum (an expression).
 963
 964    As for the contents of a tree node: there are some fields
 965    that all nodes share.  Each TREE_CODE has various special-purpose
 966    fields as well.  The fields of a node are never accessed directly,
 967    always through accessor macros.  */
 968
 969 /* Every kind of tree node starts with this structure,
 970    so all nodes have these fields.
 971
 972    See the accessor macros, defined below, for documentation of the
 973    fields, and the table below which connects the fields and the
 974    accessor macros.  */
 975
 976 struct GTY(()) tree_base {
 977   ENUM_BITFIELD(tree_code) code : 16;
 978
 979   unsigned side_effects_flag : 1;
 980   unsigned constant_flag : 1;
 981   unsigned addressable_flag : 1;
 982   unsigned volatile_flag : 1;
 983   unsigned readonly_flag : 1;
 984   unsigned asm_written_flag: 1;
 985   unsigned nowarning_flag : 1;
 986   unsigned visited : 1;
 987
 988   unsigned used_flag : 1;
 989   unsigned nothrow_flag : 1;
 990   unsigned static_flag : 1;
 991   unsigned public_flag : 1;
 992   unsigned private_flag : 1;
 993   unsigned protected_flag : 1;
 994   unsigned deprecated_flag : 1;
 995   unsigned default_def_flag : 1;
 996
 997   union {
 998     /* The bits in the following structure should only be used with
 999        accessor macros that constrain inputs with tree checking.  */
1000     struct {
1001       unsigned lang_flag_0 : 1;
1002       unsigned lang_flag_1 : 1;
1003       unsigned lang_flag_2 : 1;
1004       unsigned lang_flag_3 : 1;
1005       unsigned lang_flag_4 : 1;
1006       unsigned lang_flag_5 : 1;
1007       unsigned lang_flag_6 : 1;
1008       unsigned saturating_flag : 1;
1009
1010       unsigned unsigned_flag : 1;
1011       unsigned packed_flag : 1;
1012       unsigned user_align : 1;
1013       unsigned nameless_flag : 1;
1014       unsigned atomic_flag : 1;
1015       unsigned spare0 : 3;
1016
1017       unsigned spare1 : 8;
1018
1019       /* This field is only used with TREE_TYPE nodes; the only reason it is
1020          present in tree_base instead of tree_type is to save space.  The size
1021          of the field must be large enough to hold addr_space_t values.  */
1022       unsigned address_space : 8;
1023     } bits;
1024
1025     /* The following fields are present in tree_base to save space.  The
1026        nodes using them do not require any of the flags above and so can
1027        make better use of the 4-byte sized word.  */
1028
1029     /* The number of HOST_WIDE_INTs in an INTEGER_CST.  */
1030     struct {
1031       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
1032          its native precision.  */
1033       unsigned char unextended;
1034
1035       /* The number of HOST_WIDE_INTs if the INTEGER_CST is extended to
1036          wider precisions based on its TYPE_SIGN.  */
1037       unsigned char extended;
1038
1039       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
1040          offset_int precision, with smaller integers being extended
1041          according to their TYPE_SIGN.  This is equal to one of the two
1042          fields above but is cached for speed.  */
1043       unsigned char offset;
1044     } int_length;
1045
1046     /* VEC length.  This field is only used with TREE_VEC.  */
1047     int length;
1048
1049     /* This field is only used with VECTOR_CST.  */
1050     struct {
1051       /* The value of VECTOR_CST_LOG2_NPATTERNS.  */
1052       unsigned int log2_npatterns : 8;
1053
1054       /* The value of VECTOR_CST_NELTS_PER_PATTERN.  */
1055       unsigned int nelts_per_pattern : 8;
1056
1057       /* For future expansion.  */
1058       unsigned int unused : 16;
1059     } vector_cst;
1060
1061     /* SSA version number.  This field is only used with SSA_NAME.  */
1062     unsigned int version;
1063
1064     /* CHREC_VARIABLE.  This field is only used with POLYNOMIAL_CHREC.  */
1065     unsigned int chrec_var;
1066
1067     /* Internal function code.  */
1068     enum internal_fn ifn;
1069
1070     /* OMP_ATOMIC* memory order.  */
1071     enum omp_memory_order omp_atomic_memory_order;
1072
1073     /* The following two fields are used for MEM_REF and TARGET_MEM_REF
1074        expression trees and specify known data non-dependences.  For
1075        two memory references in a function they are known to not
1076        alias if dependence_info.clique are equal and dependence_info.base
1077        are distinct.  Clique number zero means there is no information,
1078        clique number one is populated from function global information
1079        and thus needs no remapping on transforms like loop unrolling.  */
1080     struct {
1081       unsigned short clique;
1082       unsigned short base;
1083     } dependence_info;
1084   } GTY((skip(""))) u;
1085 };
1086
1087 /* The following table lists the uses of each of the above flags and
1088    for which types of nodes they are defined.
1089
1090    addressable_flag:
1091
1092        TREE_ADDRESSABLE in
1093            VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
1094            SSA_NAME
1095            all types
1096            CONSTRUCTOR, IDENTIFIER_NODE
1097            STMT_EXPR
1098
1099        CALL_EXPR_TAILCALL in
1100            CALL_EXPR
1101
1102        CASE_LOW_SEEN in
1103            CASE_LABEL_EXPR
1104
1105        PREDICT_EXPR_OUTCOME in
1106            PREDICT_EXPR
1107
1108    static_flag:
1109
1110        TREE_STATIC in
1111            VAR_DECL, FUNCTION_DECL
1112            CONSTRUCTOR
1113
1114        TREE_NO_TRAMPOLINE in
1115            ADDR_EXPR
1116
1117        BINFO_VIRTUAL_P in
1118            TREE_BINFO
1119
1120        TREE_SYMBOL_REFERENCED in
1121            IDENTIFIER_NODE
1122
1123        CLEANUP_EH_ONLY in
1124            TARGET_EXPR, WITH_CLEANUP_EXPR
1125
1126        TRY_CATCH_IS_CLEANUP in
1127            TRY_CATCH_EXPR
1128
1129        ASM_INPUT_P in
1130            ASM_EXPR
1131
1132        TYPE_REF_CAN_ALIAS_ALL in
1133            POINTER_TYPE, REFERENCE_TYPE
1134
1135        CASE_HIGH_SEEN in
1136            CASE_LABEL_EXPR
1137
1138        ENUM_IS_SCOPED in
1139            ENUMERAL_TYPE
1140
1141        TRANSACTION_EXPR_OUTER in
1142            TRANSACTION_EXPR
1143
1144        SSA_NAME_ANTI_RANGE_P in
1145            SSA_NAME
1146
1147        MUST_TAIL_CALL in
1148            CALL_EXPR
1149
1150    public_flag:
1151
1152        TREE_OVERFLOW in
1153            INTEGER_CST, REAL_CST, COMPLEX_CST, VECTOR_CST
1154
1155        TREE_PUBLIC in
1156            VAR_DECL, FUNCTION_DECL
1157            IDENTIFIER_NODE
1158
1159        CONSTRUCTOR_NO_CLEARING in
1160            CONSTRUCTOR
1161
1162        ASM_VOLATILE_P in
1163            ASM_EXPR
1164
1165        CALL_EXPR_VA_ARG_PACK in
1166            CALL_EXPR
1167
1168        TYPE_CACHED_VALUES_P in
1169            all types
1170
1171        SAVE_EXPR_RESOLVED_P in
1172            SAVE_EXPR
1173
1174        OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE in
1175            OMP_CLAUSE_LASTPRIVATE
1176
1177        OMP_CLAUSE_PRIVATE_DEBUG in
1178            OMP_CLAUSE_PRIVATE
1179
1180        OMP_CLAUSE_LINEAR_NO_COPYIN in
1181            OMP_CLAUSE_LINEAR
1182
1183        OMP_CLAUSE_MAP_ZERO_BIAS_ARRAY_SECTION in
1184            OMP_CLAUSE_MAP
1185
1186        OMP_CLAUSE_REDUCTION_OMP_ORIG_REF in
1187            OMP_CLAUSE_{,TASK_,IN_}REDUCTION
1188
1189        OMP_CLAUSE_USE_DEVICE_PTR_IF_PRESENT in
1190            OMP_CLAUSE_USE_DEVICE_PTR
1191
1192        TRANSACTION_EXPR_RELAXED in
1193            TRANSACTION_EXPR
1194
1195        FALLTHROUGH_LABEL_P in
1196            LABEL_DECL
1197
1198        SSA_NAME_IS_VIRTUAL_OPERAND in
1199            SSA_NAME
1200
1201        EXPR_LOCATION_WRAPPER_P in
1202            NON_LVALUE_EXPR, VIEW_CONVERT_EXPR
1203
1204    private_flag:
1205
1206        TREE_PRIVATE in
1207            all decls
1208
1209        CALL_EXPR_RETURN_SLOT_OPT in
1210            CALL_EXPR
1211
1212        OMP_SECTION_LAST in
1213            OMP_SECTION
1214
1215        OMP_PARALLEL_COMBINED in
1216            OMP_PARALLEL
1217
1218        OMP_CLAUSE_PRIVATE_OUTER_REF in
1219            OMP_CLAUSE_PRIVATE
1220
1221        OMP_CLAUSE_LINEAR_NO_COPYOUT in
1222            OMP_CLAUSE_LINEAR
1223
1224        TYPE_REF_IS_RVALUE in
1225            REFERENCE_TYPE
1226
1227        ENUM_IS_OPAQUE in
1228            ENUMERAL_TYPE
1229
1230    protected_flag:
1231
1232        TREE_PROTECTED in
1233            BLOCK
1234            all decls
1235
1236        CALL_FROM_THUNK_P and
1237        CALL_ALLOCA_FOR_VAR_P and
1238        CALL_FROM_NEW_OR_DELETE_P in
1239            CALL_EXPR
1240
1241        OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
1242            OMP_CLAUSE_LINEAR
1243
1244        ASM_INLINE_P in
1245            ASM_EXPR
1246
1247    side_effects_flag:
1248
1249        TREE_SIDE_EFFECTS in
1250            all expressions
1251            all decls
1252            all constants
1253
1254        FORCED_LABEL in
1255            LABEL_DECL
1256
1257    volatile_flag:
1258
1259        TREE_THIS_VOLATILE in
1260            all expressions
1261            all decls
1262
1263        TYPE_VOLATILE in
1264            all types
1265
1266    readonly_flag:
1267
1268        TREE_READONLY in
1269            all expressions
1270            all decls
1271
1272        TYPE_READONLY in
1273            all types
1274
1275    constant_flag:
1276
1277        TREE_CONSTANT in
1278            all expressions
1279            all decls
1280            all constants
1281
1282        TYPE_SIZES_GIMPLIFIED in
1283            all types
1284
1285    unsigned_flag:
1286
1287        TYPE_UNSIGNED in
1288            all types
1289
1290        DECL_UNSIGNED in
1291            all decls
1292
1293    asm_written_flag:
1294
1295        TREE_ASM_WRITTEN in
1296            VAR_DECL, FUNCTION_DECL, TYPE_DECL
1297            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE
1298            BLOCK, STRING_CST
1299
1300        SSA_NAME_OCCURS_IN_ABNORMAL_PHI in
1301            SSA_NAME
1302
1303    used_flag:
1304
1305        TREE_USED in
1306            all expressions
1307            all decls
1308            IDENTIFIER_NODE
1309
1310    nothrow_flag:
1311
1312        TREE_NOTHROW in
1313            CALL_EXPR
1314            FUNCTION_DECL
1315
1316        TREE_THIS_NOTRAP in
1317           INDIRECT_REF, MEM_REF, TARGET_MEM_REF, ARRAY_REF, ARRAY_RANGE_REF
1318
1319        SSA_NAME_IN_FREE_LIST in
1320           SSA_NAME
1321
1322        DECL_NONALIASED in
1323           VAR_DECL
1324
1325    deprecated_flag:
1326
1327        TREE_DEPRECATED in
1328            all decls
1329            all types
1330
1331        IDENTIFIER_TRANSPARENT_ALIAS in
1332            IDENTIFIER_NODE
1333
1334        SSA_NAME_POINTS_TO_READONLY_MEMORY in
1335            SSA_NAME
1336
1337    visited:
1338
1339        TREE_VISITED in
1340            all trees (used liberally by many passes)
1341
1342    saturating_flag:
1343
1344        TYPE_REVERSE_STORAGE_ORDER in
1345            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE, ARRAY_TYPE
1346
1347        TYPE_SATURATING in
1348            other types
1349
1350        VAR_DECL_IS_VIRTUAL_OPERAND in
1351            VAR_DECL
1352
1353    nowarning_flag:
1354
1355        TREE_NO_WARNING in
1356            all expressions
1357            all decls
1358
1359        TYPE_ARTIFICIAL in
1360            all types
1361
1362    default_def_flag:
1363
1364        TYPE_FINAL_P in
1365            RECORD_TYPE, UNION_TYPE and QUAL_UNION_TYPE
1366
1367        TYPE_VECTOR_OPAQUE in
1368            VECTOR_TYPE
1369
1370        SSA_NAME_IS_DEFAULT_DEF in
1371            SSA_NAME
1372
1373        DECL_NONLOCAL_FRAME in
1374            VAR_DECL
1375
1376        REF_REVERSE_STORAGE_ORDER in
1377            BIT_FIELD_REF, MEM_REF
1378
1379        FUNC_ADDR_BY_DESCRIPTOR in
1380            ADDR_EXPR
1381
1382        CALL_EXPR_BY_DESCRIPTOR in
1383            CALL_EXPR
1384 */
1385
1386 struct GTY(()) tree_typed {
1387   struct tree_base base;
1388   tree type;
1389 };
1390
1391 struct GTY(()) tree_common {
1392   struct tree_typed typed;
1393   tree chain;
1394 };
1395
1396 struct GTY(()) tree_int_cst {
1397   struct tree_typed typed;
1398   HOST_WIDE_INT val[1];
1399 };
1400
1401
1402 struct GTY(()) tree_real_cst {
1403   struct tree_typed typed;
1404   struct real_value * real_cst_ptr;
1405 };
1406
1407 struct GTY(()) tree_fixed_cst {
1408   struct tree_typed typed;
1409   struct fixed_value * fixed_cst_ptr;
1410 };
1411
1412 struct GTY(()) tree_string {
1413   struct tree_typed typed;
1414   int length;
1415   char str[1];
1416 };
1417
1418 struct GTY(()) tree_complex {
1419   struct tree_typed typed;
1420   tree real;
1421   tree imag;
1422 };
1423
1424 struct GTY(()) tree_vector {
1425   struct tree_typed typed;
1426   tree GTY ((length ("vector_cst_encoded_nelts ((tree) &%h)"))) elts[1];
1427 };
1428
1429 struct GTY(()) tree_poly_int_cst {
1430   struct tree_typed typed;
1431   tree coeffs[NUM_POLY_INT_COEFFS];
1432 };
1433
1434 struct GTY(()) tree_identifier {
1435   struct tree_common common;
1436   struct ht_identifier id;
1437 };
1438
1439 struct GTY(()) tree_list {
1440   struct tree_common common;
1441   tree purpose;
1442   tree value;
1443 };
1444
1445 struct GTY(()) tree_vec {
1446   struct tree_common common;
1447   tree GTY ((length ("TREE_VEC_LENGTH ((tree)&%h)"))) a[1];
1448 };
1449
1450 /* A single element of a CONSTRUCTOR. VALUE holds the actual value of the
1451    element. INDEX can optionally design the position of VALUE: in arrays,
1452    it is the index where VALUE has to be placed; in structures, it is the
1453    FIELD_DECL of the member.  */
1454 struct GTY(()) constructor_elt {
1455   tree index;
1456   tree value;
1457 };
1458
1459 struct GTY(()) tree_constructor {
1460   struct tree_typed typed;
1461   vec<constructor_elt, va_gc> *elts;
1462 };
1463
1464 enum omp_clause_depend_kind
1465 {
1466   OMP_CLAUSE_DEPEND_IN,
1467   OMP_CLAUSE_DEPEND_OUT,
1468   OMP_CLAUSE_DEPEND_INOUT,
1469   OMP_CLAUSE_DEPEND_MUTEXINOUTSET,
1470   OMP_CLAUSE_DEPEND_SOURCE,
1471   OMP_CLAUSE_DEPEND_SINK,
1472   OMP_CLAUSE_DEPEND_DEPOBJ,
1473   OMP_CLAUSE_DEPEND_LAST
1474 };
1475
1476 enum omp_clause_proc_bind_kind
1477 {
1478   /* Numbers should match omp_proc_bind_t enum in omp.h.  */
1479   OMP_CLAUSE_PROC_BIND_FALSE = 0,
1480   OMP_CLAUSE_PROC_BIND_TRUE = 1,
1481   OMP_CLAUSE_PROC_BIND_MASTER = 2,
1482   OMP_CLAUSE_PROC_BIND_CLOSE = 3,
1483   OMP_CLAUSE_PROC_BIND_SPREAD = 4,
1484   OMP_CLAUSE_PROC_BIND_LAST
1485 };
1486
1487 enum omp_clause_device_type_kind
1488 {
1489   OMP_CLAUSE_DEVICE_TYPE_HOST = 1,
1490   OMP_CLAUSE_DEVICE_TYPE_NOHOST = 2,
1491   OMP_CLAUSE_DEVICE_TYPE_ANY = 3
1492 };
1493
1494 enum omp_clause_linear_kind
1495 {
1496   OMP_CLAUSE_LINEAR_DEFAULT,
1497   OMP_CLAUSE_LINEAR_REF,
1498   OMP_CLAUSE_LINEAR_VAL,
1499   OMP_CLAUSE_LINEAR_UVAL
1500 };
1501
1502 struct GTY(()) tree_exp {
1503   struct tree_typed typed;
1504   location_t locus;
1505   tree GTY ((special ("tree_exp"),
1506              desc ("TREE_CODE ((tree) &%0)")))
1507     operands[1];
1508 };
1509
1510 /* Immediate use linking structure.  This structure is used for maintaining
1511    a doubly linked list of uses of an SSA_NAME.  */
1512 struct GTY(()) ssa_use_operand_t {
1513   struct ssa_use_operand_t* GTY((skip(""))) prev;
1514   struct ssa_use_operand_t* GTY((skip(""))) next;
1515   /* Immediate uses for a given SSA name are maintained as a cyclic
1516      list.  To recognize the root of this list, the location field
1517      needs to point to the original SSA name.  Since statements and
1518      SSA names are of different data types, we need this union.  See
1519      the explanation in struct imm_use_iterator.  */
1520   union { gimple *stmt; tree ssa_name; } GTY((skip(""))) loc;
1521   tree *GTY((skip(""))) use;
1522 };
1523
1524 struct GTY(()) tree_ssa_name {
1525   struct tree_typed typed;
1526
1527   /* _DECL wrapped by this SSA name.  */
1528   tree var;
1529
1530   /* Statement that defines this SSA name.  */
1531   gimple *def_stmt;
1532
1533   /* Value range information.  */
1534   union ssa_name_info_type {
1535     /* Pointer attributes used for alias analysis.  */
1536     struct GTY ((tag ("0"))) ptr_info_def *ptr_info;
1537     /* Value range attributes used for zero/sign extension elimination.  */
1538     struct GTY ((tag ("1"))) range_info_def *range_info;
1539   } GTY ((desc ("%1.typed.type ?" \
1540                 "!POINTER_TYPE_P (TREE_TYPE ((tree)&%1)) : 2"))) info;
1541
1542   /* Immediate uses list for this SSA_NAME.  */
1543   struct ssa_use_operand_t imm_uses;
1544 };
1545
1546 struct GTY(()) phi_arg_d {
1547   /* imm_use MUST be the first element in struct because we do some
1548      pointer arithmetic with it.  See phi_arg_index_from_use.  */
1549   struct ssa_use_operand_t imm_use;
1550   tree def;
1551   location_t locus;
1552 };
1553
1554 struct GTY(()) tree_omp_clause {
1555   struct tree_common common;
1556   location_t locus;
1557   enum omp_clause_code code;
1558   union omp_clause_subcode {
1559     enum omp_clause_default_kind   default_kind;
1560     enum omp_clause_schedule_kind  schedule_kind;
1561     enum omp_clause_depend_kind    depend_kind;
1562     /* See include/gomp-constants.h for enum gomp_map_kind's values.  */
1563     unsigned int                   map_kind;
1564     enum omp_clause_proc_bind_kind proc_bind_kind;
1565     enum tree_code                 reduction_code;
1566     enum omp_clause_linear_kind    linear_kind;
1567     enum tree_code                 if_modifier;
1568     enum omp_clause_defaultmap_kind defaultmap_kind;
1569     enum omp_clause_bind_kind      bind_kind;
1570     enum omp_clause_device_type_kind device_type_kind;
1571   } GTY ((skip)) subcode;
1572
1573   /* The gimplification of OMP_CLAUSE_REDUCTION_{INIT,MERGE} for omp-low's
1574      usage.  */
1575   gimple_seq gimple_reduction_init;
1576   gimple_seq gimple_reduction_merge;
1577
1578   tree GTY ((length ("omp_clause_num_ops[OMP_CLAUSE_CODE ((tree)&%h)]")))
1579     ops[1];
1580 };
1581
1582 struct GTY(()) tree_block {
1583   struct tree_base base;
1584   tree chain;
1585
1586   unsigned block_num;
1587
1588   location_t locus;
1589   location_t end_locus;
1590
1591   tree vars;
1592   vec<tree, va_gc> *nonlocalized_vars;
1593
1594   tree subblocks;
1595   tree supercontext;
1596   tree abstract_origin;
1597   tree fragment_origin;
1598   tree fragment_chain;
1599
1600   /* Pointer to the DWARF lexical block.  */
1601   struct die_struct *die;
1602 };
1603
1604 struct GTY(()) tree_type_common {
1605   struct tree_common common;
1606   tree size;
1607   tree size_unit;
1608   tree attributes;
1609   unsigned int uid;
1610
1611   unsigned int precision : 10;
1612   unsigned no_force_blk_flag : 1;
1613   unsigned needs_constructing_flag : 1;
1614   unsigned transparent_aggr_flag : 1;
1615   unsigned restrict_flag : 1;
1616   unsigned contains_placeholder_bits : 2;
1617
1618   ENUM_BITFIELD(machine_mode) mode : 8;
1619
1620   /* TYPE_STRING_FLAG for INTEGER_TYPE and ARRAY_TYPE.
1621      TYPE_CXX_ODR_P for RECORD_TYPE and UNION_TYPE.  */
1622   unsigned string_flag : 1;
1623   unsigned lang_flag_0 : 1;
1624   unsigned lang_flag_1 : 1;
1625   unsigned lang_flag_2 : 1;
1626   unsigned lang_flag_3 : 1;
1627   unsigned lang_flag_4 : 1;
1628   unsigned lang_flag_5 : 1;
1629   unsigned lang_flag_6 : 1;
1630   unsigned lang_flag_7 : 1;
1631
1632   /* TYPE_ALIGN in log2; this has to be large enough to hold values
1633      of the maximum of BIGGEST_ALIGNMENT and MAX_OFILE_ALIGNMENT,
1634      the latter being usually the larger.  For ELF it is 8<<28,
1635      so we need to store the value 32 (not 31, as we need the zero
1636      as well), hence six bits.  */
1637   unsigned align : 6;
1638   unsigned warn_if_not_align : 6;
1639   unsigned typeless_storage : 1;
1640   unsigned empty_flag : 1;
1641   unsigned indivisible_p : 1;
1642   unsigned spare : 16;
1643
1644   alias_set_type alias_set;
1645   tree pointer_to;
1646   tree reference_to;
1647   union tree_type_symtab {
1648     int GTY ((tag ("TYPE_SYMTAB_IS_ADDRESS"))) address;
1649     struct die_struct * GTY ((tag ("TYPE_SYMTAB_IS_DIE"))) die;
1650   } GTY ((desc ("debug_hooks->tree_type_symtab_field"))) symtab;
1651   tree canonical;
1652   tree next_variant;
1653   tree main_variant;
1654   tree context;
1655   tree name;
1656 };
1657
1658 struct GTY(()) tree_type_with_lang_specific {
1659   struct tree_type_common common;
1660   /* Points to a structure whose details depend on the language in use.  */
1661   struct lang_type *lang_specific;
1662 };
1663
1664 struct GTY(()) tree_type_non_common {
1665   struct tree_type_with_lang_specific with_lang_specific;
1666   tree values;
1667   tree minval;
1668   tree maxval;
1669   tree lang_1;
1670 };
1671
1672 struct GTY (()) tree_binfo {
1673   struct tree_common common;
1674
1675   tree offset;
1676   tree vtable;
1677   tree virtuals;
1678   tree vptr_field;
1679   vec<tree, va_gc> *base_accesses;
1680   tree inheritance;
1681
1682   tree vtt_subvtt;
1683   tree vtt_vptr;
1684
1685   vec<tree, va_gc> base_binfos;
1686 };
1687
1688 struct GTY(()) tree_decl_minimal {
1689   struct tree_common common;
1690   location_t locus;
1691   unsigned int uid;
1692   tree name;
1693   tree context;
1694 };
1695
1696 struct GTY(()) tree_decl_common {
1697   struct tree_decl_minimal common;
1698   tree size;
1699
1700   ENUM_BITFIELD(machine_mode) mode : 8;
1701
1702   unsigned nonlocal_flag : 1;
1703   unsigned virtual_flag : 1;
1704   unsigned ignored_flag : 1;
1705   unsigned abstract_flag : 1;
1706   unsigned artificial_flag : 1;
1707   unsigned preserve_flag: 1;
1708   unsigned debug_expr_is_from : 1;
1709
1710   unsigned lang_flag_0 : 1;
1711   unsigned lang_flag_1 : 1;
1712   unsigned lang_flag_2 : 1;
1713   unsigned lang_flag_3 : 1;
1714   unsigned lang_flag_4 : 1;
1715   unsigned lang_flag_5 : 1;
1716   unsigned lang_flag_6 : 1;
1717   unsigned lang_flag_7 : 1;
1718   unsigned lang_flag_8 : 1;
1719
1720   /* In VAR_DECL and PARM_DECL, this is DECL_REGISTER
1721      In TRANSLATION_UNIT_DECL, this is TRANSLATION_UNIT_WARN_EMPTY_P.
1722      In FIELD_DECL, this is DECL_FIELD_ABI_IGNORED.  */
1723   unsigned decl_flag_0 : 1;
1724   /* In FIELD_DECL, this is DECL_BIT_FIELD
1725      In VAR_DECL and FUNCTION_DECL, this is DECL_EXTERNAL.
1726      In TYPE_DECL, this is TYPE_DECL_SUPPRESS_DEBUG.  */
1727   unsigned decl_flag_1 : 1;
1728   /* In FIELD_DECL, this is DECL_NONADDRESSABLE_P
1729      In VAR_DECL, PARM_DECL and RESULT_DECL, this is
1730      DECL_HAS_VALUE_EXPR_P.  */
1731   unsigned decl_flag_2 : 1;
1732   /* In FIELD_DECL, this is DECL_PADDING_P.  */
1733   unsigned decl_flag_3 : 1;
1734   /* Logically, these two would go in a theoretical base shared by var and
1735      parm decl. */
1736   unsigned not_gimple_reg_flag : 1;
1737   /* In VAR_DECL, PARM_DECL and RESULT_DECL, this is DECL_BY_REFERENCE.  */
1738   unsigned decl_by_reference_flag : 1;
1739   /* In a VAR_DECL and PARM_DECL, this is DECL_READ_P.  */
1740   unsigned decl_read_flag : 1;
1741   /* In a VAR_DECL or RESULT_DECL, this is DECL_NONSHAREABLE.  */
1742   /* In a PARM_DECL, this is DECL_HIDDEN_STRING_LENGTH.  */
1743   unsigned decl_nonshareable_flag : 1;
1744
1745   /* DECL_OFFSET_ALIGN, used only for FIELD_DECLs.  */
1746   unsigned int off_align : 6;
1747
1748   /* DECL_ALIGN.  It should have the same size as TYPE_ALIGN.  */
1749   unsigned int align : 6;
1750
1751   /* DECL_WARN_IF_NOT_ALIGN.  It should have the same size as
1752      TYPE_WARN_IF_NOT_ALIGN.  */
1753   unsigned int warn_if_not_align : 6;
1754
1755   /* 14 bits unused.  */
1756
1757   /* UID for points-to sets, stable over copying from inlining.  */
1758   unsigned int pt_uid;
1759
1760   tree size_unit;
1761   tree initial;
1762   tree attributes;
1763   tree abstract_origin;
1764
1765   /* Points to a structure whose details depend on the language in use.  */
1766   struct lang_decl *lang_specific;
1767 };
1768
1769 struct GTY(()) tree_decl_with_rtl {
1770   struct tree_decl_common common;
1771   rtx rtl;
1772 };
1773
1774 struct GTY(()) tree_field_decl {
1775   struct tree_decl_common common;
1776
1777   tree offset;
1778   tree bit_field_type;
1779   tree qualifier;
1780   tree bit_offset;
1781   tree fcontext;
1782 };
1783
1784 struct GTY(()) tree_label_decl {
1785   struct tree_decl_with_rtl common;
1786   int label_decl_uid;
1787   int eh_landing_pad_nr;
1788 };
1789
1790 struct GTY(()) tree_result_decl {
1791   struct tree_decl_with_rtl common;
1792 };
1793
1794 struct GTY(()) tree_const_decl {
1795   struct tree_decl_common common;
1796 };
1797
1798 struct GTY(()) tree_parm_decl {
1799   struct tree_decl_with_rtl common;
1800   rtx incoming_rtl;
1801 };
1802
1803 struct GTY(()) tree_decl_with_vis {
1804  struct tree_decl_with_rtl common;
1805  tree assembler_name;
1806  struct symtab_node *symtab_node;
1807
1808  /* Belong to VAR_DECL exclusively.  */
1809  unsigned defer_output : 1;
1810  unsigned hard_register : 1;
1811  unsigned common_flag : 1;
1812  unsigned in_text_section : 1;
1813  unsigned in_constant_pool : 1;
1814  unsigned dllimport_flag : 1;
1815  /* Don't belong to VAR_DECL exclusively.  */
1816  unsigned weak_flag : 1;
1817
1818  unsigned seen_in_bind_expr : 1;
1819  unsigned comdat_flag : 1;
1820  /* Used for FUNCTION_DECL, VAR_DECL and in C++ for TYPE_DECL.  */
1821  ENUM_BITFIELD(symbol_visibility) visibility : 2;
1822  unsigned visibility_specified : 1;
1823
1824  /* Belong to FUNCTION_DECL exclusively.  */
1825  unsigned init_priority_p : 1;
1826  /* Used by C++ only.  Might become a generic decl flag.  */
1827  unsigned shadowed_for_var_p : 1;
1828  /* Belong to FUNCTION_DECL exclusively.  */
1829  unsigned cxx_constructor : 1;
1830  /* Belong to FUNCTION_DECL exclusively.  */
1831  unsigned cxx_destructor : 1;
1832  /* Belong to FUNCTION_DECL exclusively.  */
1833  unsigned final : 1;
1834  /* Belong to FUNCTION_DECL exclusively.  */
1835  unsigned regdecl_flag : 1;
1836  /* 14 unused bits. */
1837  /* 32 more unused on 64 bit HW. */
1838 };
1839
1840 struct GTY(()) tree_var_decl {
1841   struct tree_decl_with_vis common;
1842 };
1843
1844 struct GTY(()) tree_decl_non_common {
1845   struct tree_decl_with_vis common;
1846   /* Almost all FE's use this.  */
1847   tree result;
1848 };
1849
1850 /* Classify a special function declaration type.  */
1851
1852 enum function_decl_type
1853 {
1854   NONE,
1855   OPERATOR_NEW,
1856   OPERATOR_DELETE,
1857   LAMBDA_FUNCTION
1858
1859   /* 0 values left */
1860 };
1861
1862 /* FUNCTION_DECL inherits from DECL_NON_COMMON because of the use of the
1863    arguments/result/saved_tree fields by front ends.   It was either inherit
1864    FUNCTION_DECL from non_common, or inherit non_common from FUNCTION_DECL,
1865    which seemed a bit strange.  */
1866
1867 struct GTY(()) tree_function_decl {
1868   struct tree_decl_non_common common;
1869
1870   struct function *f;
1871
1872   /* Arguments of the function.  */
1873   tree arguments;
1874   /* The personality function. Used for stack unwinding. */
1875   tree personality;
1876
1877   /* Function specific options that are used by this function.  */
1878   tree function_specific_target;        /* target options */
1879   tree function_specific_optimization;  /* optimization options */
1880
1881   /* Generic function body.  */
1882   tree saved_tree;
1883   /* Index within a virtual table.  */
1884   tree vindex;
1885
1886   /* In a FUNCTION_DECL this is DECL_UNCHECKED_FUNCTION_CODE.  */
1887   unsigned int function_code;
1888
1889   ENUM_BITFIELD(built_in_class) built_in_class : 2;
1890   unsigned static_ctor_flag : 1;
1891   unsigned static_dtor_flag : 1;
1892   unsigned uninlinable : 1;
1893   unsigned possibly_inlined : 1;
1894   unsigned novops_flag : 1;
1895   unsigned returns_twice_flag : 1;
1896
1897   unsigned malloc_flag : 1;
1898   unsigned declared_inline_flag : 1;
1899   unsigned no_inline_warning_flag : 1;
1900   unsigned no_instrument_function_entry_exit : 1;
1901   unsigned no_limit_stack : 1;
1902   unsigned disregard_inline_limits : 1;
1903   unsigned pure_flag : 1;
1904   unsigned looping_const_or_pure_flag : 1;
1905
1906   /* Align the bitfield to boundary of a byte.  */
1907   ENUM_BITFIELD(function_decl_type) decl_type: 2;
1908   unsigned has_debug_args_flag : 1;
1909   unsigned versioned_function : 1;
1910   unsigned replaceable_operator : 1;
1911
1912   /* 11 bits left for future expansion.  */
1913   /* 32 bits on 64-bit HW.  */
1914 };
1915
1916 struct GTY(()) tree_translation_unit_decl {
1917   struct tree_decl_common common;
1918   /* Source language of this translation unit.  Used for DWARF output.  */
1919   const char * GTY((skip(""))) language;
1920   /* TODO: Non-optimization used to build this translation unit.  */
1921   /* TODO: Root of a partial DWARF tree for global types and decls.  */
1922 };
1923
1924 struct GTY(()) tree_type_decl {
1925   struct tree_decl_non_common common;
1926
1927 };
1928
1929 struct GTY ((chain_next ("%h.next"), chain_prev ("%h.prev"))) tree_statement_list_node
1930  {
1931   struct tree_statement_list_node *prev;
1932   struct tree_statement_list_node *next;
1933   tree stmt;
1934 };
1935
1936 struct GTY(()) tree_statement_list
1937  {
1938   struct tree_typed typed;
1939   struct tree_statement_list_node *head;
1940   struct tree_statement_list_node *tail;
1941 };
1942
1943
1944 /* Optimization options used by a function.  */
1945
1946 struct GTY(()) tree_optimization_option {
1947   struct tree_base base;
1948
1949   /* The optimization options used by the user.  */
1950   struct cl_optimization *opts;
1951
1952   /* Target optabs for this set of optimization options.  This is of
1953      type `struct target_optabs *'.  */
1954   void *GTY ((atomic)) optabs;
1955
1956   /* The value of this_target_optabs against which the optabs above were
1957      generated.  */
1958   struct target_optabs *GTY ((skip)) base_optabs;
1959 };
1960
1961 /* Forward declaration, defined in target-globals.h.  */
1962
1963 class GTY(()) target_globals;
1964
1965 /* Target options used by a function.  */
1966
1967 struct GTY(()) tree_target_option {
1968   struct tree_base base;
1969
1970   /* Target globals for the corresponding target option.  */
1971   class target_globals *globals;
1972
1973   /* The optimization options used by the user.  */
1974   struct cl_target_option *opts;
1975 };
1976
1977 /* Define the overall contents of a tree node.
1978    It may be any of the structures declared above
1979    for various types of node.  */
1980 union GTY ((ptr_alias (union lang_tree_node),
1981             desc ("tree_node_structure (&%h)"), variable_size)) tree_node {
1982   struct tree_base GTY ((tag ("TS_BASE"))) base;
1983   struct tree_typed GTY ((tag ("TS_TYPED"))) typed;
1984   struct tree_common GTY ((tag ("TS_COMMON"))) common;
1985   struct tree_int_cst GTY ((tag ("TS_INT_CST"))) int_cst;
1986   struct tree_poly_int_cst GTY ((tag ("TS_POLY_INT_CST"))) poly_int_cst;
1987   struct tree_real_cst GTY ((tag ("TS_REAL_CST"))) real_cst;
1988   struct tree_fixed_cst GTY ((tag ("TS_FIXED_CST"))) fixed_cst;
1989   struct tree_vector GTY ((tag ("TS_VECTOR"))) vector;
1990   struct tree_string GTY ((tag ("TS_STRING"))) string;
1991   struct tree_complex GTY ((tag ("TS_COMPLEX"))) complex;
1992   struct tree_identifier GTY ((tag ("TS_IDENTIFIER"))) identifier;
1993   struct tree_decl_minimal GTY((tag ("TS_DECL_MINIMAL"))) decl_minimal;
1994   struct tree_decl_common GTY ((tag ("TS_DECL_COMMON"))) decl_common;
1995   struct tree_decl_with_rtl GTY ((tag ("TS_DECL_WRTL"))) decl_with_rtl;
1996   struct tree_decl_non_common  GTY ((tag ("TS_DECL_NON_COMMON")))
1997     decl_non_common;
1998   struct tree_parm_decl  GTY  ((tag ("TS_PARM_DECL"))) parm_decl;
1999   struct tree_decl_with_vis GTY ((tag ("TS_DECL_WITH_VIS"))) decl_with_vis;
2000   struct tree_var_decl GTY ((tag ("TS_VAR_DECL"))) var_decl;
2001   struct tree_field_decl GTY ((tag ("TS_FIELD_DECL"))) field_decl;
2002   struct tree_label_decl GTY ((tag ("TS_LABEL_DECL"))) label_decl;
2003   struct tree_result_decl GTY ((tag ("TS_RESULT_DECL"))) result_decl;
2004   struct tree_const_decl GTY ((tag ("TS_CONST_DECL"))) const_decl;
2005   struct tree_type_decl GTY ((tag ("TS_TYPE_DECL"))) type_decl;
2006   struct tree_function_decl GTY ((tag ("TS_FUNCTION_DECL"))) function_decl;
2007   struct tree_translation_unit_decl GTY ((tag ("TS_TRANSLATION_UNIT_DECL")))
2008     translation_unit_decl;
2009   struct tree_type_common GTY ((tag ("TS_TYPE_COMMON"))) type_common;
2010   struct tree_type_with_lang_specific GTY ((tag ("TS_TYPE_WITH_LANG_SPECIFIC")))
2011     type_with_lang_specific;
2012   struct tree_type_non_common GTY ((tag ("TS_TYPE_NON_COMMON")))
2013     type_non_common;
2014   struct tree_list GTY ((tag ("TS_LIST"))) list;
2015   struct tree_vec GTY ((tag ("TS_VEC"))) vec;
2016   struct tree_exp GTY ((tag ("TS_EXP"))) exp;
2017   struct tree_ssa_name GTY ((tag ("TS_SSA_NAME"))) ssa_name;
2018   struct tree_block GTY ((tag ("TS_BLOCK"))) block;
2019   struct tree_binfo GTY ((tag ("TS_BINFO"))) binfo;
2020   struct tree_statement_list GTY ((tag ("TS_STATEMENT_LIST"))) stmt_list;
2021   struct tree_constructor GTY ((tag ("TS_CONSTRUCTOR"))) constructor;
2022   struct tree_omp_clause GTY ((tag ("TS_OMP_CLAUSE"))) omp_clause;
2023   struct tree_optimization_option GTY ((tag ("TS_OPTIMIZATION"))) optimization;
2024   struct tree_target_option GTY ((tag ("TS_TARGET_OPTION"))) target_option;
2025 };
2026
2027 /* Structure describing an attribute and a function to handle it.  */
2028 struct attribute_spec {
2029   /* The name of the attribute (without any leading or trailing __),
2030      or NULL to mark the end of a table of attributes.  */
2031   const char *name;
2032   /* The minimum length of the list of arguments of the attribute.  */
2033   int min_length;
2034   /* The maximum length of the list of arguments of the attribute
2035      (-1 for no maximum).  */
2036   int max_length;
2037   /* Whether this attribute requires a DECL.  If it does, it will be passed
2038      from types of DECLs, function return types and array element types to
2039      the DECLs, function types and array types respectively; but when
2040      applied to a type in any other circumstances, it will be ignored with
2041      a warning.  (If greater control is desired for a given attribute,
2042      this should be false, and the flags argument to the handler may be
2043      used to gain greater control in that case.)  */
2044   bool decl_required;
2045   /* Whether this attribute requires a type.  If it does, it will be passed
2046      from a DECL to the type of that DECL.  */
2047   bool type_required;
2048   /* Whether this attribute requires a function (or method) type.  If it does,
2049      it will be passed from a function pointer type to the target type,
2050      and from a function return type (which is not itself a function
2051      pointer type) to the function type.  */
2052   bool function_type_required;
2053   /* Specifies if attribute affects type's identity.  */
2054   bool affects_type_identity;
2055   /* Function to handle this attribute.  NODE points to the node to which
2056      the attribute is to be applied.  If a DECL, it should be modified in
2057      place; if a TYPE, a copy should be created.  NAME is the canonicalized
2058      name of the attribute i.e. without any leading or trailing underscores.
2059      ARGS is the TREE_LIST of the arguments (which may be NULL).  FLAGS gives
2060      further information about the context of the attribute.  Afterwards, the
2061      attributes will be added to the DECL_ATTRIBUTES or TYPE_ATTRIBUTES, as
2062      appropriate, unless *NO_ADD_ATTRS is set to true (which should be done on
2063      error, as well as in any other cases when the attributes should not be
2064      added to the DECL or TYPE).  Depending on FLAGS, any attributes to be
2065      applied to another type or DECL later may be returned;
2066      otherwise the return value should be NULL_TREE.  This pointer may be
2067      NULL if no special handling is required beyond the checks implied
2068      by the rest of this structure.  */
2069   tree (*handler) (tree *node, tree name, tree args,
2070                    int flags, bool *no_add_attrs);
2071
2072   /* Specifies the name of an attribute that's mutually exclusive with
2073      this one, and whether the relationship applies to the function,
2074      variable, or type form of the attribute.  */
2075   struct exclusions {
2076     const char *name;
2077     bool function;
2078     bool variable;
2079     bool type;
2080   };
2081
2082   /* An array of attribute exclusions describing names of other attributes
2083      that this attribute is mutually exclusive with.  */
2084   const exclusions *exclude;
2085 };
2086
2087 /* These functions allow a front-end to perform a manual layout of a
2088    RECORD_TYPE.  (For instance, if the placement of subsequent fields
2089    depends on the placement of fields so far.)  Begin by calling
2090    start_record_layout.  Then, call place_field for each of the
2091    fields.  Then, call finish_record_layout.  See layout_type for the
2092    default way in which these functions are used.  */
2093 typedef struct record_layout_info_s {
2094   /* The RECORD_TYPE that we are laying out.  */
2095   tree t;
2096   /* The offset into the record so far, in bytes, not including bits in
2097      BITPOS.  */
2098   tree offset;
2099   /* The last known alignment of SIZE.  */
2100   unsigned int offset_align;
2101   /* The bit position within the last OFFSET_ALIGN bits, in bits.  */
2102   tree bitpos;
2103   /* The alignment of the record so far, in bits.  */
2104   unsigned int record_align;
2105   /* The alignment of the record so far, ignoring #pragma pack and
2106      __attribute__ ((packed)), in bits.  */
2107   unsigned int unpacked_align;
2108   /* The previous field laid out.  */
2109   tree prev_field;
2110   /* The static variables (i.e., class variables, as opposed to
2111      instance variables) encountered in T.  */
2112   vec<tree, va_gc> *pending_statics;
2113   /* Bits remaining in the current alignment group */
2114   int remaining_in_alignment;
2115   /* True if we've seen a packed field that didn't have normal
2116      alignment anyway.  */
2117   int packed_maybe_necessary;
2118 } *record_layout_info;
2119
2120 /* Iterator for going through the function arguments.  */
2121 struct function_args_iterator {
2122   tree next;                    /* TREE_LIST pointing to the next argument */
2123 };
2124
2125 /* Structures to map from a tree to another tree.  */
2126 struct GTY(()) tree_map_base {
2127   tree from;
2128 };
2129
2130 /* Map from a tree to another tree.  */
2131
2132 struct GTY((for_user)) tree_map {
2133   struct tree_map_base base;
2134   unsigned int hash;
2135   tree to;
2136 };
2137
2138 /* Map from a decl tree to another tree.  */
2139 struct GTY((for_user)) tree_decl_map {
2140   struct tree_map_base base;
2141   tree to;
2142 };
2143
2144 /* Map from a tree to an int.  */
2145 struct GTY((for_user)) tree_int_map {
2146   struct tree_map_base base;
2147   unsigned int to;
2148 };
2149
2150 /* Map from a decl tree to a tree vector.  */
2151 struct GTY((for_user)) tree_vec_map {
2152   struct tree_map_base base;
2153   vec<tree, va_gc> *to;
2154 };
2155
2156 /* Abstract iterators for CALL_EXPRs.  These static inline definitions
2157    have to go towards the end of tree.h so that union tree_node is fully
2158    defined by this point.  */
2159
2160 /* Structure containing iterator state.  */
2161 struct call_expr_arg_iterator {
2162   tree t;       /* the call_expr */
2163   int n;        /* argument count */
2164   int i;        /* next argument index */
2165 };
2166
2167 struct const_call_expr_arg_iterator {
2168   const_tree t; /* the call_expr */
2169   int n;        /* argument count */
2170   int i;        /* next argument index */
2171 };
2172
2173 /* The builtin_info structure holds the FUNCTION_DECL of the standard builtin
2174    function, and flags.  */
2175 struct GTY(()) builtin_info_type {
2176   tree decl;
2177   /* Whether the user can use <xxx> instead of explicitly using calls
2178      to __builtin_<xxx>.  */
2179   unsigned implicit_p : 1;
2180   /* Whether the user has provided a declaration of <xxx>.  */
2181   unsigned declared_p : 1;
2182 };
2183
2184 /* Information about a _FloatN or _FloatNx type that may be
2185    supported.  */
2186 struct floatn_type_info {
2187   /* The number N in the type name.  */
2188   int n;
2189   /* Whether it is an extended type _FloatNx (true) or an interchange
2190      type (false).  */
2191   bool extended;
2192 };
2193
2194
2195 /*---------------------------------------------------------------------------
2196                                 Global variables
2197 ---------------------------------------------------------------------------*/
2198 /* Matrix describing the structures contained in a given tree code.  */
2199 extern bool tree_contains_struct[MAX_TREE_CODES][64];
2200
2201 /* Class of tree given its code.  */
2202 extern const enum tree_code_class tree_code_type[];
2203
2204 /* Each tree code class has an associated string representation.
2205    These must correspond to the tree_code_class entries.  */
2206 extern const char *const tree_code_class_strings[];
2207
2208 /* Number of argument-words in each kind of tree-node.  */
2209 extern const unsigned char tree_code_length[];
2210
2211 /* Vector of all alias pairs for global symbols.  */
2212 extern GTY(()) vec<alias_pair, va_gc> *alias_pairs;
2213
2214 /* Names of all the built_in classes.  */
2215 extern const char *const built_in_class_names[BUILT_IN_LAST];
2216
2217 /* Names of all the built_in functions.  */
2218 extern const char * built_in_names[(int) END_BUILTINS];
2219
2220 /* Number of operands and names for each OMP_CLAUSE node.  */
2221 extern unsigned const char omp_clause_num_ops[];
2222 extern const char * const omp_clause_code_name[];
2223
2224 /* A vector of all translation-units.  */
2225 extern GTY (()) vec<tree, va_gc> *all_translation_units;
2226
2227 /* Vector of standard trees used by the C compiler.  */
2228 extern GTY(()) tree global_trees[TI_MAX];
2229
2230 /* The standard C integer types.  Use integer_type_kind to index into
2231    this array.  */
2232 extern GTY(()) tree integer_types[itk_none];
2233
2234 /* Types used to represent sizes.  */
2235 extern GTY(()) tree sizetype_tab[(int) stk_type_kind_last];
2236
2237 /* Arrays for keeping track of tree node statistics.  */
2238 extern uint64_t tree_node_counts[];
2239 extern uint64_t tree_node_sizes[];
2240
2241 /* True if we are in gimple form and the actions of the folders need to
2242    be restricted.  False if we are not in gimple form and folding is not
2243    restricted to creating gimple expressions.  */
2244 extern bool in_gimple_form;
2245
2246 /* Functional interface to the builtin functions.  */
2247 extern GTY(()) builtin_info_type builtin_info[(int)END_BUILTINS];
2248
2249 /* If nonzero, an upper limit on alignment of structure fields, in bits,  */
2250 extern unsigned int maximum_field_alignment;
2251
2252 /* Points to the FUNCTION_DECL of the function whose body we are reading.  */
2253 extern GTY(()) tree current_function_decl;
2254
2255 /* Nonzero means a FUNC_BEGIN label was emitted.  */
2256 extern GTY(()) const char * current_function_func_begin_label;
2257
2258 /* Information about the _FloatN and _FloatNx types.  */
2259 extern const floatn_type_info floatn_nx_types[NUM_FLOATN_NX_TYPES];
2260
2261 #endif  // GCC_TREE_CORE_H