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: detach (event-handle).  */
 303   OMP_CLAUSE_DETACH,
 304
 305   /* OpenACC clause: use_device (variable-list).
 306      OpenMP clause: use_device_ptr (ptr-list).  */
 307   OMP_CLAUSE_USE_DEVICE_PTR,
 308
 309   /* OpenMP clause: use_device_addr (variable-list).  */
 310   OMP_CLAUSE_USE_DEVICE_ADDR,
 311
 312   /* OpenMP clause: is_device_ptr (variable-list).  */
 313   OMP_CLAUSE_IS_DEVICE_PTR,
 314
 315   /* OpenMP clause: inclusive (variable-list).  */
 316   OMP_CLAUSE_INCLUSIVE,
 317
 318   /* OpenMP clause: exclusive (variable-list).  */
 319   OMP_CLAUSE_EXCLUSIVE,
 320
 321   /* OpenMP clause: from (variable-list).  */
 322   OMP_CLAUSE_FROM,
 323
 324   /* OpenMP clause: to (variable-list).  */
 325   OMP_CLAUSE_TO,
 326
 327   /* OpenACC clauses: {copy, copyin, copyout, create, delete, deviceptr,
 328      device, host (self), present, present_or_copy (pcopy), present_or_copyin
 329      (pcopyin), present_or_copyout (pcopyout), present_or_create (pcreate)}
 330      (variable-list).
 331
 332      OpenMP clause: map ({alloc:,to:,from:,tofrom:,}variable-list).  */
 333   OMP_CLAUSE_MAP,
 334
 335   /* Internal structure to hold OpenACC cache directive's variable-list.
 336      #pragma acc cache (variable-list).  */
 337   OMP_CLAUSE__CACHE_,
 338
 339   /* OpenACC clause: gang [(gang-argument-list)].
 340      Where
 341       gang-argument-list: [gang-argument-list, ] gang-argument
 342       gang-argument: [num:] integer-expression
 343                    | static: size-expression
 344       size-expression: * | integer-expression.  */
 345   OMP_CLAUSE_GANG,
 346
 347   /* OpenACC clause: async [(integer-expression)].  */
 348   OMP_CLAUSE_ASYNC,
 349
 350   /* OpenACC clause: wait [(integer-expression-list)].  */
 351   OMP_CLAUSE_WAIT,
 352
 353   /* OpenACC clause: auto.  */
 354   OMP_CLAUSE_AUTO,
 355
 356   /* OpenACC clause: seq.  */
 357   OMP_CLAUSE_SEQ,
 358
 359   /* Internal clause: temporary for combined loops expansion.  */
 360   OMP_CLAUSE__LOOPTEMP_,
 361
 362   /* Internal clause: temporary for task reductions.  */
 363   OMP_CLAUSE__REDUCTEMP_,
 364
 365   /* Internal clause: temporary for lastprivate(conditional:).  */
 366   OMP_CLAUSE__CONDTEMP_,
 367
 368   /* Internal clause: temporary for inscan reductions.  */
 369   OMP_CLAUSE__SCANTEMP_,
 370
 371   /* OpenACC/OpenMP clause: if (scalar-expression).  */
 372   OMP_CLAUSE_IF,
 373
 374   /* OpenMP clause: num_threads (integer-expression).  */
 375   OMP_CLAUSE_NUM_THREADS,
 376
 377   /* OpenMP clause: schedule.  */
 378   OMP_CLAUSE_SCHEDULE,
 379
 380   /* OpenMP clause: nowait.  */
 381   OMP_CLAUSE_NOWAIT,
 382
 383   /* OpenMP clause: ordered [(constant-integer-expression)].  */
 384   OMP_CLAUSE_ORDERED,
 385
 386   /* OpenACC/OpenMP clause: default.  */
 387   OMP_CLAUSE_DEFAULT,
 388
 389   /* OpenACC/OpenMP clause: collapse (constant-integer-expression).  */
 390   OMP_CLAUSE_COLLAPSE,
 391
 392   /* OpenMP clause: untied.  */
 393   OMP_CLAUSE_UNTIED,
 394
 395   /* OpenMP clause: final (scalar-expression).  */
 396   OMP_CLAUSE_FINAL,
 397
 398   /* OpenMP clause: mergeable.  */
 399   OMP_CLAUSE_MERGEABLE,
 400
 401   /* OpenMP clause: device (integer-expression).  */
 402   OMP_CLAUSE_DEVICE,
 403
 404   /* OpenMP clause: dist_schedule (static[:chunk-size]).  */
 405   OMP_CLAUSE_DIST_SCHEDULE,
 406
 407   /* OpenMP clause: inbranch.  */
 408   OMP_CLAUSE_INBRANCH,
 409
 410   /* OpenMP clause: notinbranch.  */
 411   OMP_CLAUSE_NOTINBRANCH,
 412
 413   /* OpenMP clause: num_teams(integer-expression).  */
 414   OMP_CLAUSE_NUM_TEAMS,
 415
 416   /* OpenMP clause: thread_limit(integer-expression).  */
 417   OMP_CLAUSE_THREAD_LIMIT,
 418
 419   /* OpenMP clause: proc_bind ({master,close,spread}).  */
 420   OMP_CLAUSE_PROC_BIND,
 421
 422   /* OpenMP clause: safelen (constant-integer-expression).  */
 423   OMP_CLAUSE_SAFELEN,
 424
 425   /* OpenMP clause: simdlen (constant-integer-expression).  */
 426   OMP_CLAUSE_SIMDLEN,
 427
 428   /* OpenMP clause: device_type ({host,nohost,any}).  */
 429   OMP_CLAUSE_DEVICE_TYPE,
 430
 431   /* OpenMP clause: for.  */
 432   OMP_CLAUSE_FOR,
 433
 434   /* OpenMP clause: parallel.  */
 435   OMP_CLAUSE_PARALLEL,
 436
 437   /* OpenMP clause: sections.  */
 438   OMP_CLAUSE_SECTIONS,
 439
 440   /* OpenMP clause: taskgroup.  */
 441   OMP_CLAUSE_TASKGROUP,
 442
 443   /* OpenMP clause: priority (integer-expression).  */
 444   OMP_CLAUSE_PRIORITY,
 445
 446   /* OpenMP clause: grainsize (integer-expression).  */
 447   OMP_CLAUSE_GRAINSIZE,
 448
 449   /* OpenMP clause: num_tasks (integer-expression).  */
 450   OMP_CLAUSE_NUM_TASKS,
 451
 452   /* OpenMP clause: nogroup.  */
 453   OMP_CLAUSE_NOGROUP,
 454
 455   /* OpenMP clause: threads.  */
 456   OMP_CLAUSE_THREADS,
 457
 458   /* OpenMP clause: simd.  */
 459   OMP_CLAUSE_SIMD,
 460
 461   /* OpenMP clause: hint (integer-expression).  */
 462   OMP_CLAUSE_HINT,
 463
 464   /* OpenMP clause: defaultmap (tofrom: scalar).  */
 465   OMP_CLAUSE_DEFAULTMAP,
 466
 467   /* OpenMP clause: order (concurrent).  */
 468   OMP_CLAUSE_ORDER,
 469
 470   /* OpenMP clause: bind (binding).  */
 471   OMP_CLAUSE_BIND,
 472
 473   /* Internally used only clause, holding SIMD uid.  */
 474   OMP_CLAUSE__SIMDUID_,
 475
 476   /* Internally used only clause, flag whether this is SIMT simd
 477      loop or not.  */
 478   OMP_CLAUSE__SIMT_,
 479
 480   /* OpenACC clause: independent.  */
 481   OMP_CLAUSE_INDEPENDENT,
 482
 483   /* OpenACC clause: worker [( [num:] integer-expression)].  */
 484   OMP_CLAUSE_WORKER,
 485
 486   /* OpenACC clause: vector [( [length:] integer-expression)].  */
 487   OMP_CLAUSE_VECTOR,
 488
 489   /* OpenACC clause: num_gangs (integer-expression).  */
 490   OMP_CLAUSE_NUM_GANGS,
 491
 492   /* OpenACC clause: num_workers (integer-expression).  */
 493   OMP_CLAUSE_NUM_WORKERS,
 494
 495   /* OpenACC clause: vector_length (integer-expression).  */
 496   OMP_CLAUSE_VECTOR_LENGTH,
 497
 498   /* OpenACC clause: tile ( size-expr-list ).  */
 499   OMP_CLAUSE_TILE,
 500
 501   /* OpenACC clause: if_present.  */
 502   OMP_CLAUSE_IF_PRESENT,
 503
 504   /* OpenACC clause: finalize.  */
 505   OMP_CLAUSE_FINALIZE
 506 };
 507
 508 #undef DEFTREESTRUCT
 509 #define DEFTREESTRUCT(ENUM, NAME) ENUM,
 510 enum tree_node_structure_enum {
 511 #include "treestruct.def"
 512   LAST_TS_ENUM
 513 };
 514 #undef DEFTREESTRUCT
 515
 516 enum omp_clause_schedule_kind {
 517   OMP_CLAUSE_SCHEDULE_STATIC,
 518   OMP_CLAUSE_SCHEDULE_DYNAMIC,
 519   OMP_CLAUSE_SCHEDULE_GUIDED,
 520   OMP_CLAUSE_SCHEDULE_AUTO,
 521   OMP_CLAUSE_SCHEDULE_RUNTIME,
 522   OMP_CLAUSE_SCHEDULE_MASK = (1 << 3) - 1,
 523   OMP_CLAUSE_SCHEDULE_MONOTONIC = (1 << 3),
 524   OMP_CLAUSE_SCHEDULE_NONMONOTONIC = (1 << 4),
 525   OMP_CLAUSE_SCHEDULE_LAST = 2 * OMP_CLAUSE_SCHEDULE_NONMONOTONIC - 1
 526 };
 527
 528 enum omp_clause_default_kind {
 529   OMP_CLAUSE_DEFAULT_UNSPECIFIED,
 530   OMP_CLAUSE_DEFAULT_SHARED,
 531   OMP_CLAUSE_DEFAULT_NONE,
 532   OMP_CLAUSE_DEFAULT_PRIVATE,
 533   OMP_CLAUSE_DEFAULT_FIRSTPRIVATE,
 534   OMP_CLAUSE_DEFAULT_PRESENT,
 535   OMP_CLAUSE_DEFAULT_LAST
 536 };
 537
 538 enum omp_clause_defaultmap_kind {
 539   OMP_CLAUSE_DEFAULTMAP_CATEGORY_UNSPECIFIED,
 540   OMP_CLAUSE_DEFAULTMAP_CATEGORY_SCALAR,
 541   OMP_CLAUSE_DEFAULTMAP_CATEGORY_AGGREGATE,
 542   OMP_CLAUSE_DEFAULTMAP_CATEGORY_ALLOCATABLE,
 543   OMP_CLAUSE_DEFAULTMAP_CATEGORY_POINTER,
 544   OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK = 7,
 545   OMP_CLAUSE_DEFAULTMAP_ALLOC = 1 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 546   OMP_CLAUSE_DEFAULTMAP_TO = 2 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 547   OMP_CLAUSE_DEFAULTMAP_FROM = 3 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 548   OMP_CLAUSE_DEFAULTMAP_TOFROM = 4 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 549   OMP_CLAUSE_DEFAULTMAP_FIRSTPRIVATE
 550     = 5 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 551   OMP_CLAUSE_DEFAULTMAP_NONE = 6 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 552   OMP_CLAUSE_DEFAULTMAP_DEFAULT
 553     = 7 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1),
 554   OMP_CLAUSE_DEFAULTMAP_MASK = 7 * (OMP_CLAUSE_DEFAULTMAP_CATEGORY_MASK + 1)
 555 };
 556
 557 enum omp_clause_bind_kind {
 558   OMP_CLAUSE_BIND_TEAMS,
 559   OMP_CLAUSE_BIND_PARALLEL,
 560   OMP_CLAUSE_BIND_THREAD
 561 };
 562
 563 /* memory-order-clause on OpenMP atomic/flush constructs or
 564    argument of atomic_default_mem_order clause.  */
 565 enum omp_memory_order {
 566   OMP_MEMORY_ORDER_UNSPECIFIED,
 567   OMP_MEMORY_ORDER_RELAXED,
 568   OMP_MEMORY_ORDER_ACQUIRE,
 569   OMP_MEMORY_ORDER_RELEASE,
 570   OMP_MEMORY_ORDER_ACQ_REL,
 571   OMP_MEMORY_ORDER_SEQ_CST
 572 };
 573
 574 /* There is a TYPE_QUAL value for each type qualifier.  They can be
 575    combined by bitwise-or to form the complete set of qualifiers for a
 576    type.  */
 577 enum cv_qualifier {
 578   TYPE_UNQUALIFIED   = 0x0,
 579   TYPE_QUAL_CONST    = 0x1,
 580   TYPE_QUAL_VOLATILE = 0x2,
 581   TYPE_QUAL_RESTRICT = 0x4,
 582   TYPE_QUAL_ATOMIC   = 0x8
 583 };
 584
 585 /* Standard named or nameless data types of the C compiler.  */
 586 enum tree_index {
 587   TI_ERROR_MARK,
 588   TI_INTQI_TYPE,
 589   TI_INTHI_TYPE,
 590   TI_INTSI_TYPE,
 591   TI_INTDI_TYPE,
 592   TI_INTTI_TYPE,
 593
 594   TI_UINTQI_TYPE,
 595   TI_UINTHI_TYPE,
 596   TI_UINTSI_TYPE,
 597   TI_UINTDI_TYPE,
 598   TI_UINTTI_TYPE,
 599
 600   TI_ATOMICQI_TYPE,
 601   TI_ATOMICHI_TYPE,
 602   TI_ATOMICSI_TYPE,
 603   TI_ATOMICDI_TYPE,
 604   TI_ATOMICTI_TYPE,
 605
 606   TI_UINT16_TYPE,
 607   TI_UINT32_TYPE,
 608   TI_UINT64_TYPE,
 609   TI_UINT128_TYPE,
 610
 611   TI_VOID,
 612
 613   TI_INTEGER_ZERO,
 614   TI_INTEGER_ONE,
 615   TI_INTEGER_THREE,
 616   TI_INTEGER_MINUS_ONE,
 617   TI_NULL_POINTER,
 618
 619   TI_SIZE_ZERO,
 620   TI_SIZE_ONE,
 621
 622   TI_BITSIZE_ZERO,
 623   TI_BITSIZE_ONE,
 624   TI_BITSIZE_UNIT,
 625
 626   TI_PUBLIC,
 627   TI_PROTECTED,
 628   TI_PRIVATE,
 629
 630   TI_BOOLEAN_FALSE,
 631   TI_BOOLEAN_TRUE,
 632
 633   TI_FLOAT_TYPE,
 634   TI_DOUBLE_TYPE,
 635   TI_LONG_DOUBLE_TYPE,
 636
 637   /* The _FloatN and _FloatNx types must be consecutive, and in the
 638      same sequence as the corresponding complex types, which must also
 639      be consecutive; _FloatN must come before _FloatNx; the order must
 640      also be the same as in the floatn_nx_types array and the RID_*
 641      values in c-common.h.  This is so that iterations over these
 642      types work as intended.  */
 643   TI_FLOAT16_TYPE,
 644   TI_FLOATN_TYPE_FIRST = TI_FLOAT16_TYPE,
 645   TI_FLOATN_NX_TYPE_FIRST = TI_FLOAT16_TYPE,
 646   TI_FLOAT32_TYPE,
 647   TI_FLOAT64_TYPE,
 648   TI_FLOAT128_TYPE,
 649   TI_FLOATN_TYPE_LAST = TI_FLOAT128_TYPE,
 650 #define NUM_FLOATN_TYPES (TI_FLOATN_TYPE_LAST - TI_FLOATN_TYPE_FIRST + 1)
 651   TI_FLOAT32X_TYPE,
 652   TI_FLOATNX_TYPE_FIRST = TI_FLOAT32X_TYPE,
 653   TI_FLOAT64X_TYPE,
 654   TI_FLOAT128X_TYPE,
 655   TI_FLOATNX_TYPE_LAST = TI_FLOAT128X_TYPE,
 656   TI_FLOATN_NX_TYPE_LAST = TI_FLOAT128X_TYPE,
 657 #define NUM_FLOATNX_TYPES (TI_FLOATNX_TYPE_LAST - TI_FLOATNX_TYPE_FIRST + 1)
 658 #define NUM_FLOATN_NX_TYPES (TI_FLOATN_NX_TYPE_LAST             \
 659                              - TI_FLOATN_NX_TYPE_FIRST          \
 660                              + 1)
 661
 662   /* Put the complex types after their component types, so that in (sequential)
 663      tree streaming we can assert that their component types have already been
 664      handled (see tree-streamer.c:record_common_node).  */
 665   TI_COMPLEX_INTEGER_TYPE,
 666   TI_COMPLEX_FLOAT_TYPE,
 667   TI_COMPLEX_DOUBLE_TYPE,
 668   TI_COMPLEX_LONG_DOUBLE_TYPE,
 669
 670   TI_COMPLEX_FLOAT16_TYPE,
 671   TI_COMPLEX_FLOATN_NX_TYPE_FIRST = TI_COMPLEX_FLOAT16_TYPE,
 672   TI_COMPLEX_FLOAT32_TYPE,
 673   TI_COMPLEX_FLOAT64_TYPE,
 674   TI_COMPLEX_FLOAT128_TYPE,
 675   TI_COMPLEX_FLOAT32X_TYPE,
 676   TI_COMPLEX_FLOAT64X_TYPE,
 677   TI_COMPLEX_FLOAT128X_TYPE,
 678
 679   TI_FLOAT_PTR_TYPE,
 680   TI_DOUBLE_PTR_TYPE,
 681   TI_LONG_DOUBLE_PTR_TYPE,
 682   TI_INTEGER_PTR_TYPE,
 683
 684   TI_VOID_TYPE,
 685   TI_PTR_TYPE,
 686   TI_CONST_PTR_TYPE,
 687   TI_SIZE_TYPE,
 688   TI_PID_TYPE,
 689   TI_PTRDIFF_TYPE,
 690   TI_VA_LIST_TYPE,
 691   TI_VA_LIST_GPR_COUNTER_FIELD,
 692   TI_VA_LIST_FPR_COUNTER_FIELD,
 693   TI_BOOLEAN_TYPE,
 694   TI_FILEPTR_TYPE,
 695   TI_CONST_TM_PTR_TYPE,
 696   TI_FENV_T_PTR_TYPE,
 697   TI_CONST_FENV_T_PTR_TYPE,
 698   TI_FEXCEPT_T_PTR_TYPE,
 699   TI_CONST_FEXCEPT_T_PTR_TYPE,
 700   TI_POINTER_SIZED_TYPE,
 701
 702   TI_DFLOAT32_TYPE,
 703   TI_DFLOAT64_TYPE,
 704   TI_DFLOAT128_TYPE,
 705
 706   TI_VOID_LIST_NODE,
 707
 708   TI_MAIN_IDENTIFIER,
 709
 710   TI_SAT_SFRACT_TYPE,
 711   TI_SAT_FRACT_TYPE,
 712   TI_SAT_LFRACT_TYPE,
 713   TI_SAT_LLFRACT_TYPE,
 714   TI_SAT_USFRACT_TYPE,
 715   TI_SAT_UFRACT_TYPE,
 716   TI_SAT_ULFRACT_TYPE,
 717   TI_SAT_ULLFRACT_TYPE,
 718   TI_SFRACT_TYPE,
 719   TI_FRACT_TYPE,
 720   TI_LFRACT_TYPE,
 721   TI_LLFRACT_TYPE,
 722   TI_USFRACT_TYPE,
 723   TI_UFRACT_TYPE,
 724   TI_ULFRACT_TYPE,
 725   TI_ULLFRACT_TYPE,
 726   TI_SAT_SACCUM_TYPE,
 727   TI_SAT_ACCUM_TYPE,
 728   TI_SAT_LACCUM_TYPE,
 729   TI_SAT_LLACCUM_TYPE,
 730   TI_SAT_USACCUM_TYPE,
 731   TI_SAT_UACCUM_TYPE,
 732   TI_SAT_ULACCUM_TYPE,
 733   TI_SAT_ULLACCUM_TYPE,
 734   TI_SACCUM_TYPE,
 735   TI_ACCUM_TYPE,
 736   TI_LACCUM_TYPE,
 737   TI_LLACCUM_TYPE,
 738   TI_USACCUM_TYPE,
 739   TI_UACCUM_TYPE,
 740   TI_ULACCUM_TYPE,
 741   TI_ULLACCUM_TYPE,
 742   TI_QQ_TYPE,
 743   TI_HQ_TYPE,
 744   TI_SQ_TYPE,
 745   TI_DQ_TYPE,
 746   TI_TQ_TYPE,
 747   TI_UQQ_TYPE,
 748   TI_UHQ_TYPE,
 749   TI_USQ_TYPE,
 750   TI_UDQ_TYPE,
 751   TI_UTQ_TYPE,
 752   TI_SAT_QQ_TYPE,
 753   TI_SAT_HQ_TYPE,
 754   TI_SAT_SQ_TYPE,
 755   TI_SAT_DQ_TYPE,
 756   TI_SAT_TQ_TYPE,
 757   TI_SAT_UQQ_TYPE,
 758   TI_SAT_UHQ_TYPE,
 759   TI_SAT_USQ_TYPE,
 760   TI_SAT_UDQ_TYPE,
 761   TI_SAT_UTQ_TYPE,
 762   TI_HA_TYPE,
 763   TI_SA_TYPE,
 764   TI_DA_TYPE,
 765   TI_TA_TYPE,
 766   TI_UHA_TYPE,
 767   TI_USA_TYPE,
 768   TI_UDA_TYPE,
 769   TI_UTA_TYPE,
 770   TI_SAT_HA_TYPE,
 771   TI_SAT_SA_TYPE,
 772   TI_SAT_DA_TYPE,
 773   TI_SAT_TA_TYPE,
 774   TI_SAT_UHA_TYPE,
 775   TI_SAT_USA_TYPE,
 776   TI_SAT_UDA_TYPE,
 777   TI_SAT_UTA_TYPE,
 778
 779   TI_MODULE_HWM,
 780   /* Nodes below here change during compilation, and should therefore
 781      not be in the C++ module's global tree table.  */
 782
 783   TI_OPTIMIZATION_DEFAULT,
 784   TI_OPTIMIZATION_CURRENT,
 785   TI_TARGET_OPTION_DEFAULT,
 786   TI_TARGET_OPTION_CURRENT,
 787   TI_CURRENT_TARGET_PRAGMA,
 788   TI_CURRENT_OPTIMIZE_PRAGMA,
 789
 790   TI_CHREC_DONT_KNOW,
 791   TI_CHREC_KNOWN,
 792
 793   TI_MAX
 794 };
 795
 796 /* An enumeration of the standard C integer types.  These must be
 797    ordered so that shorter types appear before longer ones, and so
 798    that signed types appear before unsigned ones, for the correct
 799    functioning of interpret_integer() in c-lex.c.  */
 800 enum integer_type_kind {
 801   itk_char,
 802   itk_signed_char,
 803   itk_unsigned_char,
 804   itk_short,
 805   itk_unsigned_short,
 806   itk_int,
 807   itk_unsigned_int,
 808   itk_long,
 809   itk_unsigned_long,
 810   itk_long_long,
 811   itk_unsigned_long_long,
 812
 813   itk_intN_0,
 814   itk_unsigned_intN_0,
 815   itk_intN_1,
 816   itk_unsigned_intN_1,
 817   itk_intN_2,
 818   itk_unsigned_intN_2,
 819   itk_intN_3,
 820   itk_unsigned_intN_3,
 821
 822   itk_none
 823 };
 824
 825 /* A pointer-to-function member type looks like:
 826
 827      struct {
 828        __P __pfn;
 829        ptrdiff_t __delta;
 830      };
 831
 832    If __pfn is NULL, it is a NULL pointer-to-member-function.
 833
 834    (Because the vtable is always the first thing in the object, we
 835    don't need its offset.)  If the function is virtual, then PFN is
 836    one plus twice the index into the vtable; otherwise, it is just a
 837    pointer to the function.
 838
 839    Unfortunately, using the lowest bit of PFN doesn't work in
 840    architectures that don't impose alignment requirements on function
 841    addresses, or that use the lowest bit to tell one ISA from another,
 842    for example.  For such architectures, we use the lowest bit of
 843    DELTA instead of the lowest bit of the PFN, and DELTA will be
 844    multiplied by 2.  */
 845 enum ptrmemfunc_vbit_where_t {
 846   ptrmemfunc_vbit_in_pfn,
 847   ptrmemfunc_vbit_in_delta
 848 };
 849
 850 /* Flags that may be passed in the third argument of decl_attributes, and
 851    to handler functions for attributes.  */
 852 enum attribute_flags {
 853   /* The type passed in is the type of a DECL, and any attributes that
 854      should be passed in again to be applied to the DECL rather than the
 855      type should be returned.  */
 856   ATTR_FLAG_DECL_NEXT = 1,
 857   /* The type passed in is a function return type, and any attributes that
 858      should be passed in again to be applied to the function type rather
 859      than the return type should be returned.  */
 860   ATTR_FLAG_FUNCTION_NEXT = 2,
 861   /* The type passed in is an array element type, and any attributes that
 862      should be passed in again to be applied to the array type rather
 863      than the element type should be returned.  */
 864   ATTR_FLAG_ARRAY_NEXT = 4,
 865   /* The type passed in is a structure, union or enumeration type being
 866      created, and should be modified in place.  */
 867   ATTR_FLAG_TYPE_IN_PLACE = 8,
 868   /* The attributes are being applied by default to a library function whose
 869      name indicates known behavior, and should be silently ignored if they
 870      are not in fact compatible with the function type.  */
 871   ATTR_FLAG_BUILT_IN = 16,
 872   /* A given attribute has been parsed as a C++-11 attribute.  */
 873   ATTR_FLAG_CXX11 = 32,
 874   /* The attribute handler is being invoked with an internal argument
 875      that may not otherwise be valid when specified in source code.  */
 876   ATTR_FLAG_INTERNAL = 64
 877 };
 878
 879 /* Types used to represent sizes.  */
 880 enum size_type_kind {
 881   stk_sizetype,         /* Normal representation of sizes in bytes.  */
 882   stk_ssizetype,        /* Signed representation of sizes in bytes.  */
 883   stk_bitsizetype,      /* Normal representation of sizes in bits.  */
 884   stk_sbitsizetype,     /* Signed representation of sizes in bits.  */
 885   stk_type_kind_last
 886 };
 887
 888 enum operand_equal_flag {
 889   OEP_ONLY_CONST = 1,
 890   OEP_PURE_SAME = 2,
 891   OEP_MATCH_SIDE_EFFECTS = 4,
 892   OEP_ADDRESS_OF = 8,
 893   /* Internal within operand_equal_p:  */
 894   OEP_NO_HASH_CHECK = 16,
 895   /* Internal within inchash::add_expr:  */
 896   OEP_HASH_CHECK = 32,
 897   /* Makes operand_equal_p handle more expressions:  */
 898   OEP_LEXICOGRAPHIC = 64,
 899   OEP_BITWISE = 128
 900 };
 901
 902 /* Enum and arrays used for tree allocation stats.
 903    Keep in sync with tree.c:tree_node_kind_names.  */
 904 enum tree_node_kind {
 905   d_kind,
 906   t_kind,
 907   b_kind,
 908   s_kind,
 909   r_kind,
 910   e_kind,
 911   c_kind,
 912   id_kind,
 913   vec_kind,
 914   binfo_kind,
 915   ssa_name_kind,
 916   constr_kind,
 917   x_kind,
 918   lang_decl,
 919   lang_type,
 920   omp_clause_kind,
 921   all_kinds
 922 };
 923
 924 enum annot_expr_kind {
 925   annot_expr_ivdep_kind,
 926   annot_expr_unroll_kind,
 927   annot_expr_no_vector_kind,
 928   annot_expr_vector_kind,
 929   annot_expr_parallel_kind,
 930   annot_expr_kind_last
 931 };
 932
 933 /*---------------------------------------------------------------------------
 934                                 Type definitions
 935 ---------------------------------------------------------------------------*/
 936 /* When processing aliases at the symbol table level, we need the
 937    declaration of target. For this reason we need to queue aliases and
 938    process them after all declarations has been produced.  */
 939 struct GTY(()) alias_pair {
 940   tree decl;
 941   tree target;
 942 };
 943
 944 /* An initialization priority.  */
 945 typedef unsigned short priority_type;
 946
 947 /* The type of a callback function for walking over tree structure.  */
 948 typedef tree (*walk_tree_fn) (tree *, int *, void *);
 949
 950 /* The type of a callback function that represents a custom walk_tree.  */
 951 typedef tree (*walk_tree_lh) (tree *, int *, tree (*) (tree *, int *, void *),
 952                               void *, hash_set<tree> *);
 953
 954
 955 /*---------------------------------------------------------------------------
 956                               Main data structures
 957 ---------------------------------------------------------------------------*/
 958 /* A tree node can represent a data type, a variable, an expression
 959    or a statement.  Each node has a TREE_CODE which says what kind of
 960    thing it represents.  Some common codes are:
 961    INTEGER_TYPE -- represents a type of integers.
 962    ARRAY_TYPE -- represents a type of pointer.
 963    VAR_DECL -- represents a declared variable.
 964    INTEGER_CST -- represents a constant integer value.
 965    PLUS_EXPR -- represents a sum (an expression).
 966
 967    As for the contents of a tree node: there are some fields
 968    that all nodes share.  Each TREE_CODE has various special-purpose
 969    fields as well.  The fields of a node are never accessed directly,
 970    always through accessor macros.  */
 971
 972 /* Every kind of tree node starts with this structure,
 973    so all nodes have these fields.
 974
 975    See the accessor macros, defined below, for documentation of the
 976    fields, and the table below which connects the fields and the
 977    accessor macros.  */
 978
 979 struct GTY(()) tree_base {
 980   ENUM_BITFIELD(tree_code) code : 16;
 981
 982   unsigned side_effects_flag : 1;
 983   unsigned constant_flag : 1;
 984   unsigned addressable_flag : 1;
 985   unsigned volatile_flag : 1;
 986   unsigned readonly_flag : 1;
 987   unsigned asm_written_flag: 1;
 988   unsigned nowarning_flag : 1;
 989   unsigned visited : 1;
 990
 991   unsigned used_flag : 1;
 992   unsigned nothrow_flag : 1;
 993   unsigned static_flag : 1;
 994   unsigned public_flag : 1;
 995   unsigned private_flag : 1;
 996   unsigned protected_flag : 1;
 997   unsigned deprecated_flag : 1;
 998   unsigned default_def_flag : 1;
 999
1000   union {
1001     /* The bits in the following structure should only be used with
1002        accessor macros that constrain inputs with tree checking.  */
1003     struct {
1004       unsigned lang_flag_0 : 1;
1005       unsigned lang_flag_1 : 1;
1006       unsigned lang_flag_2 : 1;
1007       unsigned lang_flag_3 : 1;
1008       unsigned lang_flag_4 : 1;
1009       unsigned lang_flag_5 : 1;
1010       unsigned lang_flag_6 : 1;
1011       unsigned saturating_flag : 1;
1012
1013       unsigned unsigned_flag : 1;
1014       unsigned packed_flag : 1;
1015       unsigned user_align : 1;
1016       unsigned nameless_flag : 1;
1017       unsigned atomic_flag : 1;
1018       unsigned spare0 : 3;
1019
1020       unsigned spare1 : 8;
1021
1022       /* This field is only used with TREE_TYPE nodes; the only reason it is
1023          present in tree_base instead of tree_type is to save space.  The size
1024          of the field must be large enough to hold addr_space_t values.  */
1025       unsigned address_space : 8;
1026     } bits;
1027
1028     /* The following fields are present in tree_base to save space.  The
1029        nodes using them do not require any of the flags above and so can
1030        make better use of the 4-byte sized word.  */
1031
1032     /* The number of HOST_WIDE_INTs in an INTEGER_CST.  */
1033     struct {
1034       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
1035          its native precision.  */
1036       unsigned char unextended;
1037
1038       /* The number of HOST_WIDE_INTs if the INTEGER_CST is extended to
1039          wider precisions based on its TYPE_SIGN.  */
1040       unsigned char extended;
1041
1042       /* The number of HOST_WIDE_INTs if the INTEGER_CST is accessed in
1043          offset_int precision, with smaller integers being extended
1044          according to their TYPE_SIGN.  This is equal to one of the two
1045          fields above but is cached for speed.  */
1046       unsigned char offset;
1047     } int_length;
1048
1049     /* VEC length.  This field is only used with TREE_VEC.  */
1050     int length;
1051
1052     /* This field is only used with VECTOR_CST.  */
1053     struct {
1054       /* The value of VECTOR_CST_LOG2_NPATTERNS.  */
1055       unsigned int log2_npatterns : 8;
1056
1057       /* The value of VECTOR_CST_NELTS_PER_PATTERN.  */
1058       unsigned int nelts_per_pattern : 8;
1059
1060       /* For future expansion.  */
1061       unsigned int unused : 16;
1062     } vector_cst;
1063
1064     /* SSA version number.  This field is only used with SSA_NAME.  */
1065     unsigned int version;
1066
1067     /* CHREC_VARIABLE.  This field is only used with POLYNOMIAL_CHREC.  */
1068     unsigned int chrec_var;
1069
1070     /* Internal function code.  */
1071     enum internal_fn ifn;
1072
1073     /* OMP_ATOMIC* memory order.  */
1074     enum omp_memory_order omp_atomic_memory_order;
1075
1076     /* The following two fields are used for MEM_REF and TARGET_MEM_REF
1077        expression trees and specify known data non-dependences.  For
1078        two memory references in a function they are known to not
1079        alias if dependence_info.clique are equal and dependence_info.base
1080        are distinct.  Clique number zero means there is no information,
1081        clique number one is populated from function global information
1082        and thus needs no remapping on transforms like loop unrolling.  */
1083     struct {
1084       unsigned short clique;
1085       unsigned short base;
1086     } dependence_info;
1087   } GTY((skip(""))) u;
1088 };
1089
1090 /* The following table lists the uses of each of the above flags and
1091    for which types of nodes they are defined.
1092
1093    addressable_flag:
1094
1095        TREE_ADDRESSABLE in
1096            VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
1097            SSA_NAME
1098            all types
1099            CONSTRUCTOR, IDENTIFIER_NODE
1100            STMT_EXPR
1101
1102        CALL_EXPR_TAILCALL in
1103            CALL_EXPR
1104
1105        CASE_LOW_SEEN in
1106            CASE_LABEL_EXPR
1107
1108        PREDICT_EXPR_OUTCOME in
1109            PREDICT_EXPR
1110
1111    static_flag:
1112
1113        TREE_STATIC in
1114            VAR_DECL, FUNCTION_DECL
1115            CONSTRUCTOR
1116
1117        TREE_NO_TRAMPOLINE in
1118            ADDR_EXPR
1119
1120        BINFO_VIRTUAL_P in
1121            TREE_BINFO
1122
1123        TREE_SYMBOL_REFERENCED in
1124            IDENTIFIER_NODE
1125
1126        CLEANUP_EH_ONLY in
1127            TARGET_EXPR, WITH_CLEANUP_EXPR
1128
1129        TRY_CATCH_IS_CLEANUP in
1130            TRY_CATCH_EXPR
1131
1132        ASM_INPUT_P in
1133            ASM_EXPR
1134
1135        TYPE_REF_CAN_ALIAS_ALL in
1136            POINTER_TYPE, REFERENCE_TYPE
1137
1138        CASE_HIGH_SEEN in
1139            CASE_LABEL_EXPR
1140
1141        ENUM_IS_SCOPED in
1142            ENUMERAL_TYPE
1143
1144        TRANSACTION_EXPR_OUTER in
1145            TRANSACTION_EXPR
1146
1147        SSA_NAME_ANTI_RANGE_P in
1148            SSA_NAME
1149
1150        MUST_TAIL_CALL in
1151            CALL_EXPR
1152
1153    public_flag:
1154
1155        TREE_OVERFLOW in
1156            INTEGER_CST, REAL_CST, COMPLEX_CST, VECTOR_CST
1157
1158        TREE_PUBLIC in
1159            VAR_DECL, FUNCTION_DECL
1160            IDENTIFIER_NODE
1161
1162        CONSTRUCTOR_NO_CLEARING in
1163            CONSTRUCTOR
1164
1165        ASM_VOLATILE_P in
1166            ASM_EXPR
1167
1168        CALL_EXPR_VA_ARG_PACK in
1169            CALL_EXPR
1170
1171        TYPE_CACHED_VALUES_P in
1172            all types
1173
1174        SAVE_EXPR_RESOLVED_P in
1175            SAVE_EXPR
1176
1177        OMP_CLAUSE_LASTPRIVATE_FIRSTPRIVATE in
1178            OMP_CLAUSE_LASTPRIVATE
1179
1180        OMP_CLAUSE_PRIVATE_DEBUG in
1181            OMP_CLAUSE_PRIVATE
1182
1183        OMP_CLAUSE_LINEAR_NO_COPYIN in
1184            OMP_CLAUSE_LINEAR
1185
1186        OMP_CLAUSE_MAP_ZERO_BIAS_ARRAY_SECTION in
1187            OMP_CLAUSE_MAP
1188
1189        OMP_CLAUSE_REDUCTION_OMP_ORIG_REF in
1190            OMP_CLAUSE_{,TASK_,IN_}REDUCTION
1191
1192        OMP_CLAUSE_USE_DEVICE_PTR_IF_PRESENT in
1193            OMP_CLAUSE_USE_DEVICE_PTR
1194
1195        TRANSACTION_EXPR_RELAXED in
1196            TRANSACTION_EXPR
1197
1198        FALLTHROUGH_LABEL_P in
1199            LABEL_DECL
1200
1201        SSA_NAME_IS_VIRTUAL_OPERAND in
1202            SSA_NAME
1203
1204        EXPR_LOCATION_WRAPPER_P in
1205            NON_LVALUE_EXPR, VIEW_CONVERT_EXPR
1206
1207    private_flag:
1208
1209        TREE_PRIVATE in
1210            all decls
1211
1212        CALL_EXPR_RETURN_SLOT_OPT in
1213            CALL_EXPR
1214
1215        OMP_SECTION_LAST in
1216            OMP_SECTION
1217
1218        OMP_PARALLEL_COMBINED in
1219            OMP_PARALLEL
1220
1221        OMP_CLAUSE_PRIVATE_OUTER_REF in
1222            OMP_CLAUSE_PRIVATE
1223
1224        OMP_CLAUSE_LINEAR_NO_COPYOUT in
1225            OMP_CLAUSE_LINEAR
1226
1227        TYPE_REF_IS_RVALUE in
1228            REFERENCE_TYPE
1229
1230        ENUM_IS_OPAQUE in
1231            ENUMERAL_TYPE
1232
1233    protected_flag:
1234
1235        TREE_PROTECTED in
1236            BLOCK
1237            all decls
1238
1239        CALL_FROM_THUNK_P and
1240        CALL_ALLOCA_FOR_VAR_P and
1241        CALL_FROM_NEW_OR_DELETE_P in
1242            CALL_EXPR
1243
1244        OMP_CLAUSE_LINEAR_VARIABLE_STRIDE in
1245            OMP_CLAUSE_LINEAR
1246
1247        ASM_INLINE_P in
1248            ASM_EXPR
1249
1250    side_effects_flag:
1251
1252        TREE_SIDE_EFFECTS in
1253            all expressions
1254            all decls
1255            all constants
1256
1257        FORCED_LABEL in
1258            LABEL_DECL
1259
1260    volatile_flag:
1261
1262        TREE_THIS_VOLATILE in
1263            all expressions
1264            all decls
1265
1266        TYPE_VOLATILE in
1267            all types
1268
1269    readonly_flag:
1270
1271        TREE_READONLY in
1272            all expressions
1273            all decls
1274
1275        TYPE_READONLY in
1276            all types
1277
1278    constant_flag:
1279
1280        TREE_CONSTANT in
1281            all expressions
1282            all decls
1283            all constants
1284
1285        TYPE_SIZES_GIMPLIFIED in
1286            all types
1287
1288    unsigned_flag:
1289
1290        TYPE_UNSIGNED in
1291            all types
1292
1293        DECL_UNSIGNED in
1294            all decls
1295
1296    asm_written_flag:
1297
1298        TREE_ASM_WRITTEN in
1299            VAR_DECL, FUNCTION_DECL, TYPE_DECL
1300            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE
1301            BLOCK, STRING_CST
1302
1303        SSA_NAME_OCCURS_IN_ABNORMAL_PHI in
1304            SSA_NAME
1305
1306    used_flag:
1307
1308        TREE_USED in
1309            all expressions
1310            all decls
1311            IDENTIFIER_NODE
1312
1313    nothrow_flag:
1314
1315        TREE_NOTHROW in
1316            CALL_EXPR
1317            FUNCTION_DECL
1318
1319        TREE_THIS_NOTRAP in
1320           INDIRECT_REF, MEM_REF, TARGET_MEM_REF, ARRAY_REF, ARRAY_RANGE_REF
1321
1322        SSA_NAME_IN_FREE_LIST in
1323           SSA_NAME
1324
1325        DECL_NONALIASED in
1326           VAR_DECL
1327
1328    deprecated_flag:
1329
1330        TREE_DEPRECATED in
1331            all decls
1332            all types
1333
1334        IDENTIFIER_TRANSPARENT_ALIAS in
1335            IDENTIFIER_NODE
1336
1337        SSA_NAME_POINTS_TO_READONLY_MEMORY in
1338            SSA_NAME
1339
1340    visited:
1341
1342        TREE_VISITED in
1343            all trees (used liberally by many passes)
1344
1345    saturating_flag:
1346
1347        TYPE_REVERSE_STORAGE_ORDER in
1348            RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE, ARRAY_TYPE
1349
1350        TYPE_SATURATING in
1351            other types
1352
1353        VAR_DECL_IS_VIRTUAL_OPERAND in
1354            VAR_DECL
1355
1356    nowarning_flag:
1357
1358        TREE_NO_WARNING in
1359            all expressions
1360            all decls
1361
1362        TYPE_ARTIFICIAL in
1363            all types
1364
1365    default_def_flag:
1366
1367        TYPE_FINAL_P in
1368            RECORD_TYPE, UNION_TYPE and QUAL_UNION_TYPE
1369
1370        TYPE_VECTOR_OPAQUE in
1371            VECTOR_TYPE
1372
1373        SSA_NAME_IS_DEFAULT_DEF in
1374            SSA_NAME
1375
1376        DECL_NONLOCAL_FRAME in
1377            VAR_DECL
1378
1379        REF_REVERSE_STORAGE_ORDER in
1380            BIT_FIELD_REF, MEM_REF
1381
1382        FUNC_ADDR_BY_DESCRIPTOR in
1383            ADDR_EXPR
1384
1385        CALL_EXPR_BY_DESCRIPTOR in
1386            CALL_EXPR
1387 */
1388
1389 struct GTY(()) tree_typed {
1390   struct tree_base base;
1391   tree type;
1392 };
1393
1394 struct GTY(()) tree_common {
1395   struct tree_typed typed;
1396   tree chain;
1397 };
1398
1399 struct GTY(()) tree_int_cst {
1400   struct tree_typed typed;
1401   HOST_WIDE_INT val[1];
1402 };
1403
1404
1405 struct GTY(()) tree_real_cst {
1406   struct tree_typed typed;
1407   struct real_value * real_cst_ptr;
1408 };
1409
1410 struct GTY(()) tree_fixed_cst {
1411   struct tree_typed typed;
1412   struct fixed_value * fixed_cst_ptr;
1413 };
1414
1415 struct GTY(()) tree_string {
1416   struct tree_typed typed;
1417   int length;
1418   char str[1];
1419 };
1420
1421 struct GTY(()) tree_complex {
1422   struct tree_typed typed;
1423   tree real;
1424   tree imag;
1425 };
1426
1427 struct GTY(()) tree_vector {
1428   struct tree_typed typed;
1429   tree GTY ((length ("vector_cst_encoded_nelts ((tree) &%h)"))) elts[1];
1430 };
1431
1432 struct GTY(()) tree_poly_int_cst {
1433   struct tree_typed typed;
1434   tree coeffs[NUM_POLY_INT_COEFFS];
1435 };
1436
1437 struct GTY(()) tree_identifier {
1438   struct tree_common common;
1439   struct ht_identifier id;
1440 };
1441
1442 struct GTY(()) tree_list {
1443   struct tree_common common;
1444   tree purpose;
1445   tree value;
1446 };
1447
1448 struct GTY(()) tree_vec {
1449   struct tree_common common;
1450   tree GTY ((length ("TREE_VEC_LENGTH ((tree)&%h)"))) a[1];
1451 };
1452
1453 /* A single element of a CONSTRUCTOR. VALUE holds the actual value of the
1454    element. INDEX can optionally design the position of VALUE: in arrays,
1455    it is the index where VALUE has to be placed; in structures, it is the
1456    FIELD_DECL of the member.  */
1457 struct GTY(()) constructor_elt {
1458   tree index;
1459   tree value;
1460 };
1461
1462 struct GTY(()) tree_constructor {
1463   struct tree_typed typed;
1464   vec<constructor_elt, va_gc> *elts;
1465 };
1466
1467 enum omp_clause_depend_kind
1468 {
1469   OMP_CLAUSE_DEPEND_IN,
1470   OMP_CLAUSE_DEPEND_OUT,
1471   OMP_CLAUSE_DEPEND_INOUT,
1472   OMP_CLAUSE_DEPEND_MUTEXINOUTSET,
1473   OMP_CLAUSE_DEPEND_SOURCE,
1474   OMP_CLAUSE_DEPEND_SINK,
1475   OMP_CLAUSE_DEPEND_DEPOBJ,
1476   OMP_CLAUSE_DEPEND_LAST
1477 };
1478
1479 enum omp_clause_proc_bind_kind
1480 {
1481   /* Numbers should match omp_proc_bind_t enum in omp.h.  */
1482   OMP_CLAUSE_PROC_BIND_FALSE = 0,
1483   OMP_CLAUSE_PROC_BIND_TRUE = 1,
1484   OMP_CLAUSE_PROC_BIND_MASTER = 2,
1485   OMP_CLAUSE_PROC_BIND_CLOSE = 3,
1486   OMP_CLAUSE_PROC_BIND_SPREAD = 4,
1487   OMP_CLAUSE_PROC_BIND_LAST
1488 };
1489
1490 enum omp_clause_device_type_kind
1491 {
1492   OMP_CLAUSE_DEVICE_TYPE_HOST = 1,
1493   OMP_CLAUSE_DEVICE_TYPE_NOHOST = 2,
1494   OMP_CLAUSE_DEVICE_TYPE_ANY = 3
1495 };
1496
1497 enum omp_clause_linear_kind
1498 {
1499   OMP_CLAUSE_LINEAR_DEFAULT,
1500   OMP_CLAUSE_LINEAR_REF,
1501   OMP_CLAUSE_LINEAR_VAL,
1502   OMP_CLAUSE_LINEAR_UVAL
1503 };
1504
1505 struct GTY(()) tree_exp {
1506   struct tree_typed typed;
1507   location_t locus;
1508   tree GTY ((special ("tree_exp"),
1509              desc ("TREE_CODE ((tree) &%0)")))
1510     operands[1];
1511 };
1512
1513 /* Immediate use linking structure.  This structure is used for maintaining
1514    a doubly linked list of uses of an SSA_NAME.  */
1515 struct GTY(()) ssa_use_operand_t {
1516   struct ssa_use_operand_t* GTY((skip(""))) prev;
1517   struct ssa_use_operand_t* GTY((skip(""))) next;
1518   /* Immediate uses for a given SSA name are maintained as a cyclic
1519      list.  To recognize the root of this list, the location field
1520      needs to point to the original SSA name.  Since statements and
1521      SSA names are of different data types, we need this union.  See
1522      the explanation in struct imm_use_iterator.  */
1523   union { gimple *stmt; tree ssa_name; } GTY((skip(""))) loc;
1524   tree *GTY((skip(""))) use;
1525 };
1526
1527 struct GTY(()) tree_ssa_name {
1528   struct tree_typed typed;
1529
1530   /* _DECL wrapped by this SSA name.  */
1531   tree var;
1532
1533   /* Statement that defines this SSA name.  */
1534   gimple *def_stmt;
1535
1536   /* Value range information.  */
1537   union ssa_name_info_type {
1538     /* Pointer attributes used for alias analysis.  */
1539     struct GTY ((tag ("0"))) ptr_info_def *ptr_info;
1540     /* Value range attributes used for zero/sign extension elimination.  */
1541     struct GTY ((tag ("1"))) range_info_def *range_info;
1542   } GTY ((desc ("%1.typed.type ?" \
1543                 "!POINTER_TYPE_P (TREE_TYPE ((tree)&%1)) : 2"))) info;
1544
1545   /* Immediate uses list for this SSA_NAME.  */
1546   struct ssa_use_operand_t imm_uses;
1547 };
1548
1549 struct GTY(()) phi_arg_d {
1550   /* imm_use MUST be the first element in struct because we do some
1551      pointer arithmetic with it.  See phi_arg_index_from_use.  */
1552   struct ssa_use_operand_t imm_use;
1553   tree def;
1554   location_t locus;
1555 };
1556
1557 struct GTY(()) tree_omp_clause {
1558   struct tree_common common;
1559   location_t locus;
1560   enum omp_clause_code code;
1561   union omp_clause_subcode {
1562     enum omp_clause_default_kind   default_kind;
1563     enum omp_clause_schedule_kind  schedule_kind;
1564     enum omp_clause_depend_kind    depend_kind;
1565     /* See include/gomp-constants.h for enum gomp_map_kind's values.  */
1566     unsigned int                   map_kind;
1567     enum omp_clause_proc_bind_kind proc_bind_kind;
1568     enum tree_code                 reduction_code;
1569     enum omp_clause_linear_kind    linear_kind;
1570     enum tree_code                 if_modifier;
1571     enum omp_clause_defaultmap_kind defaultmap_kind;
1572     enum omp_clause_bind_kind      bind_kind;
1573     enum omp_clause_device_type_kind device_type_kind;
1574   } GTY ((skip)) subcode;
1575
1576   /* The gimplification of OMP_CLAUSE_REDUCTION_{INIT,MERGE} for omp-low's
1577      usage.  */
1578   gimple_seq gimple_reduction_init;
1579   gimple_seq gimple_reduction_merge;
1580
1581   tree GTY ((length ("omp_clause_num_ops[OMP_CLAUSE_CODE ((tree)&%h)]")))
1582     ops[1];
1583 };
1584
1585 struct GTY(()) tree_block {
1586   struct tree_base base;
1587   tree chain;
1588
1589   unsigned block_num;
1590
1591   location_t locus;
1592   location_t end_locus;
1593
1594   tree vars;
1595   vec<tree, va_gc> *nonlocalized_vars;
1596
1597   tree subblocks;
1598   tree supercontext;
1599   tree abstract_origin;
1600   tree fragment_origin;
1601   tree fragment_chain;
1602
1603   /* Pointer to the DWARF lexical block.  */
1604   struct die_struct *die;
1605 };
1606
1607 struct GTY(()) tree_type_common {
1608   struct tree_common common;
1609   tree size;
1610   tree size_unit;
1611   tree attributes;
1612   unsigned int uid;
1613
1614   unsigned int precision : 10;
1615   unsigned no_force_blk_flag : 1;
1616   unsigned needs_constructing_flag : 1;
1617   unsigned transparent_aggr_flag : 1;
1618   unsigned restrict_flag : 1;
1619   unsigned contains_placeholder_bits : 2;
1620
1621   ENUM_BITFIELD(machine_mode) mode : 8;
1622
1623   /* TYPE_STRING_FLAG for INTEGER_TYPE and ARRAY_TYPE.
1624      TYPE_CXX_ODR_P for RECORD_TYPE and UNION_TYPE.  */
1625   unsigned string_flag : 1;
1626   unsigned lang_flag_0 : 1;
1627   unsigned lang_flag_1 : 1;
1628   unsigned lang_flag_2 : 1;
1629   unsigned lang_flag_3 : 1;
1630   unsigned lang_flag_4 : 1;
1631   unsigned lang_flag_5 : 1;
1632   unsigned lang_flag_6 : 1;
1633   unsigned lang_flag_7 : 1;
1634
1635   /* TYPE_ALIGN in log2; this has to be large enough to hold values
1636      of the maximum of BIGGEST_ALIGNMENT and MAX_OFILE_ALIGNMENT,
1637      the latter being usually the larger.  For ELF it is 8<<28,
1638      so we need to store the value 32 (not 31, as we need the zero
1639      as well), hence six bits.  */
1640   unsigned align : 6;
1641   unsigned warn_if_not_align : 6;
1642   unsigned typeless_storage : 1;
1643   unsigned empty_flag : 1;
1644   unsigned indivisible_p : 1;
1645   unsigned spare : 16;
1646
1647   alias_set_type alias_set;
1648   tree pointer_to;
1649   tree reference_to;
1650   union tree_type_symtab {
1651     int GTY ((tag ("TYPE_SYMTAB_IS_ADDRESS"))) address;
1652     struct die_struct * GTY ((tag ("TYPE_SYMTAB_IS_DIE"))) die;
1653   } GTY ((desc ("debug_hooks->tree_type_symtab_field"))) symtab;
1654   tree canonical;
1655   tree next_variant;
1656   tree main_variant;
1657   tree context;
1658   tree name;
1659 };
1660
1661 struct GTY(()) tree_type_with_lang_specific {
1662   struct tree_type_common common;
1663   /* Points to a structure whose details depend on the language in use.  */
1664   struct lang_type *lang_specific;
1665 };
1666
1667 struct GTY(()) tree_type_non_common {
1668   struct tree_type_with_lang_specific with_lang_specific;
1669   tree values;
1670   tree minval;
1671   tree maxval;
1672   tree lang_1;
1673 };
1674
1675 struct GTY (()) tree_binfo {
1676   struct tree_common common;
1677
1678   tree offset;
1679   tree vtable;
1680   tree virtuals;
1681   tree vptr_field;
1682   vec<tree, va_gc> *base_accesses;
1683   tree inheritance;
1684
1685   tree vtt_subvtt;
1686   tree vtt_vptr;
1687
1688   vec<tree, va_gc> base_binfos;
1689 };
1690
1691 struct GTY(()) tree_decl_minimal {
1692   struct tree_common common;
1693   location_t locus;
1694   unsigned int uid;
1695   tree name;
1696   tree context;
1697 };
1698
1699 struct GTY(()) tree_decl_common {
1700   struct tree_decl_minimal common;
1701   tree size;
1702
1703   ENUM_BITFIELD(machine_mode) mode : 8;
1704
1705   unsigned nonlocal_flag : 1;
1706   unsigned virtual_flag : 1;
1707   unsigned ignored_flag : 1;
1708   unsigned abstract_flag : 1;
1709   unsigned artificial_flag : 1;
1710   unsigned preserve_flag: 1;
1711   unsigned debug_expr_is_from : 1;
1712
1713   unsigned lang_flag_0 : 1;
1714   unsigned lang_flag_1 : 1;
1715   unsigned lang_flag_2 : 1;
1716   unsigned lang_flag_3 : 1;
1717   unsigned lang_flag_4 : 1;
1718   unsigned lang_flag_5 : 1;
1719   unsigned lang_flag_6 : 1;
1720   unsigned lang_flag_7 : 1;
1721   unsigned lang_flag_8 : 1;
1722
1723   /* In VAR_DECL and PARM_DECL, this is DECL_REGISTER
1724      In TRANSLATION_UNIT_DECL, this is TRANSLATION_UNIT_WARN_EMPTY_P.
1725      In FIELD_DECL, this is DECL_FIELD_ABI_IGNORED.  */
1726   unsigned decl_flag_0 : 1;
1727   /* In FIELD_DECL, this is DECL_BIT_FIELD
1728      In VAR_DECL and FUNCTION_DECL, this is DECL_EXTERNAL.
1729      In TYPE_DECL, this is TYPE_DECL_SUPPRESS_DEBUG.  */
1730   unsigned decl_flag_1 : 1;
1731   /* In FIELD_DECL, this is DECL_NONADDRESSABLE_P
1732      In VAR_DECL, PARM_DECL and RESULT_DECL, this is
1733      DECL_HAS_VALUE_EXPR_P.  */
1734   unsigned decl_flag_2 : 1;
1735   /* In FIELD_DECL, this is DECL_PADDING_P.  */
1736   unsigned decl_flag_3 : 1;
1737   /* Logically, these two would go in a theoretical base shared by var and
1738      parm decl. */
1739   unsigned not_gimple_reg_flag : 1;
1740   /* In VAR_DECL, PARM_DECL and RESULT_DECL, this is DECL_BY_REFERENCE.  */
1741   unsigned decl_by_reference_flag : 1;
1742   /* In a VAR_DECL and PARM_DECL, this is DECL_READ_P.  */
1743   unsigned decl_read_flag : 1;
1744   /* In a VAR_DECL or RESULT_DECL, this is DECL_NONSHAREABLE.  */
1745   /* In a PARM_DECL, this is DECL_HIDDEN_STRING_LENGTH.  */
1746   unsigned decl_nonshareable_flag : 1;
1747
1748   /* DECL_OFFSET_ALIGN, used only for FIELD_DECLs.  */
1749   unsigned int off_align : 6;
1750
1751   /* DECL_ALIGN.  It should have the same size as TYPE_ALIGN.  */
1752   unsigned int align : 6;
1753
1754   /* DECL_WARN_IF_NOT_ALIGN.  It should have the same size as
1755      TYPE_WARN_IF_NOT_ALIGN.  */
1756   unsigned int warn_if_not_align : 6;
1757
1758   /* 14 bits unused.  */
1759
1760   /* UID for points-to sets, stable over copying from inlining.  */
1761   unsigned int pt_uid;
1762
1763   tree size_unit;
1764   tree initial;
1765   tree attributes;
1766   tree abstract_origin;
1767
1768   /* Points to a structure whose details depend on the language in use.  */
1769   struct lang_decl *lang_specific;
1770 };
1771
1772 struct GTY(()) tree_decl_with_rtl {
1773   struct tree_decl_common common;
1774   rtx rtl;
1775 };
1776
1777 struct GTY(()) tree_field_decl {
1778   struct tree_decl_common common;
1779
1780   tree offset;
1781   tree bit_field_type;
1782   tree qualifier;
1783   tree bit_offset;
1784   tree fcontext;
1785 };
1786
1787 struct GTY(()) tree_label_decl {
1788   struct tree_decl_with_rtl common;
1789   int label_decl_uid;
1790   int eh_landing_pad_nr;
1791 };
1792
1793 struct GTY(()) tree_result_decl {
1794   struct tree_decl_with_rtl common;
1795 };
1796
1797 struct GTY(()) tree_const_decl {
1798   struct tree_decl_common common;
1799 };
1800
1801 struct GTY(()) tree_parm_decl {
1802   struct tree_decl_with_rtl common;
1803   rtx incoming_rtl;
1804 };
1805
1806 struct GTY(()) tree_decl_with_vis {
1807  struct tree_decl_with_rtl common;
1808  tree assembler_name;
1809  struct symtab_node *symtab_node;
1810
1811  /* Belong to VAR_DECL exclusively.  */
1812  unsigned defer_output : 1;
1813  unsigned hard_register : 1;
1814  unsigned common_flag : 1;
1815  unsigned in_text_section : 1;
1816  unsigned in_constant_pool : 1;
1817  unsigned dllimport_flag : 1;
1818  /* Don't belong to VAR_DECL exclusively.  */
1819  unsigned weak_flag : 1;
1820
1821  unsigned seen_in_bind_expr : 1;
1822  unsigned comdat_flag : 1;
1823  /* Used for FUNCTION_DECL, VAR_DECL and in C++ for TYPE_DECL.  */
1824  ENUM_BITFIELD(symbol_visibility) visibility : 2;
1825  unsigned visibility_specified : 1;
1826
1827  /* Belong to FUNCTION_DECL exclusively.  */
1828  unsigned init_priority_p : 1;
1829  /* Used by C++ only.  Might become a generic decl flag.  */
1830  unsigned shadowed_for_var_p : 1;
1831  /* Belong to FUNCTION_DECL exclusively.  */
1832  unsigned cxx_constructor : 1;
1833  /* Belong to FUNCTION_DECL exclusively.  */
1834  unsigned cxx_destructor : 1;
1835  /* Belong to FUNCTION_DECL exclusively.  */
1836  unsigned final : 1;
1837  /* Belong to FUNCTION_DECL exclusively.  */
1838  unsigned regdecl_flag : 1;
1839  /* 14 unused bits. */
1840  /* 32 more unused on 64 bit HW. */
1841 };
1842
1843 struct GTY(()) tree_var_decl {
1844   struct tree_decl_with_vis common;
1845 };
1846
1847 struct GTY(()) tree_decl_non_common {
1848   struct tree_decl_with_vis common;
1849   /* Almost all FE's use this.  */
1850   tree result;
1851 };
1852
1853 /* Classify a special function declaration type.  */
1854
1855 enum function_decl_type
1856 {
1857   NONE,
1858   OPERATOR_NEW,
1859   OPERATOR_DELETE,
1860   LAMBDA_FUNCTION
1861
1862   /* 0 values left */
1863 };
1864
1865 /* FUNCTION_DECL inherits from DECL_NON_COMMON because of the use of the
1866    arguments/result/saved_tree fields by front ends.   It was either inherit
1867    FUNCTION_DECL from non_common, or inherit non_common from FUNCTION_DECL,
1868    which seemed a bit strange.  */
1869
1870 struct GTY(()) tree_function_decl {
1871   struct tree_decl_non_common common;
1872
1873   struct function *f;
1874
1875   /* Arguments of the function.  */
1876   tree arguments;
1877   /* The personality function. Used for stack unwinding. */
1878   tree personality;
1879
1880   /* Function specific options that are used by this function.  */
1881   tree function_specific_target;        /* target options */
1882   tree function_specific_optimization;  /* optimization options */
1883
1884   /* Generic function body.  */
1885   tree saved_tree;
1886   /* Index within a virtual table.  */
1887   tree vindex;
1888
1889   /* In a FUNCTION_DECL this is DECL_UNCHECKED_FUNCTION_CODE.  */
1890   unsigned int function_code;
1891
1892   ENUM_BITFIELD(built_in_class) built_in_class : 2;
1893   unsigned static_ctor_flag : 1;
1894   unsigned static_dtor_flag : 1;
1895   unsigned uninlinable : 1;
1896   unsigned possibly_inlined : 1;
1897   unsigned novops_flag : 1;
1898   unsigned returns_twice_flag : 1;
1899
1900   unsigned malloc_flag : 1;
1901   unsigned declared_inline_flag : 1;
1902   unsigned no_inline_warning_flag : 1;
1903   unsigned no_instrument_function_entry_exit : 1;
1904   unsigned no_limit_stack : 1;
1905   unsigned disregard_inline_limits : 1;
1906   unsigned pure_flag : 1;
1907   unsigned looping_const_or_pure_flag : 1;
1908
1909   /* Align the bitfield to boundary of a byte.  */
1910   ENUM_BITFIELD(function_decl_type) decl_type: 2;
1911   unsigned has_debug_args_flag : 1;
1912   unsigned versioned_function : 1;
1913   unsigned replaceable_operator : 1;
1914
1915   /* 11 bits left for future expansion.  */
1916   /* 32 bits on 64-bit HW.  */
1917 };
1918
1919 struct GTY(()) tree_translation_unit_decl {
1920   struct tree_decl_common common;
1921   /* Source language of this translation unit.  Used for DWARF output.  */
1922   const char * GTY((skip(""))) language;
1923   /* TODO: Non-optimization used to build this translation unit.  */
1924   /* TODO: Root of a partial DWARF tree for global types and decls.  */
1925 };
1926
1927 struct GTY(()) tree_type_decl {
1928   struct tree_decl_non_common common;
1929
1930 };
1931
1932 struct GTY ((chain_next ("%h.next"), chain_prev ("%h.prev"))) tree_statement_list_node
1933  {
1934   struct tree_statement_list_node *prev;
1935   struct tree_statement_list_node *next;
1936   tree stmt;
1937 };
1938
1939 struct GTY(()) tree_statement_list
1940  {
1941   struct tree_typed typed;
1942   struct tree_statement_list_node *head;
1943   struct tree_statement_list_node *tail;
1944 };
1945
1946
1947 /* Optimization options used by a function.  */
1948
1949 struct GTY(()) tree_optimization_option {
1950   struct tree_base base;
1951
1952   /* The optimization options used by the user.  */
1953   struct cl_optimization *opts;
1954
1955   /* Target optabs for this set of optimization options.  This is of
1956      type `struct target_optabs *'.  */
1957   void *GTY ((atomic)) optabs;
1958
1959   /* The value of this_target_optabs against which the optabs above were
1960      generated.  */
1961   struct target_optabs *GTY ((skip)) base_optabs;
1962 };
1963
1964 /* Forward declaration, defined in target-globals.h.  */
1965
1966 class GTY(()) target_globals;
1967
1968 /* Target options used by a function.  */
1969
1970 struct GTY(()) tree_target_option {
1971   struct tree_base base;
1972
1973   /* Target globals for the corresponding target option.  */
1974   class target_globals *globals;
1975
1976   /* The optimization options used by the user.  */
1977   struct cl_target_option *opts;
1978 };
1979
1980 /* Define the overall contents of a tree node.
1981    It may be any of the structures declared above
1982    for various types of node.  */
1983 union GTY ((ptr_alias (union lang_tree_node),
1984             desc ("tree_node_structure (&%h)"), variable_size)) tree_node {
1985   struct tree_base GTY ((tag ("TS_BASE"))) base;
1986   struct tree_typed GTY ((tag ("TS_TYPED"))) typed;
1987   struct tree_common GTY ((tag ("TS_COMMON"))) common;
1988   struct tree_int_cst GTY ((tag ("TS_INT_CST"))) int_cst;
1989   struct tree_poly_int_cst GTY ((tag ("TS_POLY_INT_CST"))) poly_int_cst;
1990   struct tree_real_cst GTY ((tag ("TS_REAL_CST"))) real_cst;
1991   struct tree_fixed_cst GTY ((tag ("TS_FIXED_CST"))) fixed_cst;
1992   struct tree_vector GTY ((tag ("TS_VECTOR"))) vector;
1993   struct tree_string GTY ((tag ("TS_STRING"))) string;
1994   struct tree_complex GTY ((tag ("TS_COMPLEX"))) complex;
1995   struct tree_identifier GTY ((tag ("TS_IDENTIFIER"))) identifier;
1996   struct tree_decl_minimal GTY((tag ("TS_DECL_MINIMAL"))) decl_minimal;
1997   struct tree_decl_common GTY ((tag ("TS_DECL_COMMON"))) decl_common;
1998   struct tree_decl_with_rtl GTY ((tag ("TS_DECL_WRTL"))) decl_with_rtl;
1999   struct tree_decl_non_common  GTY ((tag ("TS_DECL_NON_COMMON")))
2000     decl_non_common;
2001   struct tree_parm_decl  GTY  ((tag ("TS_PARM_DECL"))) parm_decl;
2002   struct tree_decl_with_vis GTY ((tag ("TS_DECL_WITH_VIS"))) decl_with_vis;
2003   struct tree_var_decl GTY ((tag ("TS_VAR_DECL"))) var_decl;
2004   struct tree_field_decl GTY ((tag ("TS_FIELD_DECL"))) field_decl;
2005   struct tree_label_decl GTY ((tag ("TS_LABEL_DECL"))) label_decl;
2006   struct tree_result_decl GTY ((tag ("TS_RESULT_DECL"))) result_decl;
2007   struct tree_const_decl GTY ((tag ("TS_CONST_DECL"))) const_decl;
2008   struct tree_type_decl GTY ((tag ("TS_TYPE_DECL"))) type_decl;
2009   struct tree_function_decl GTY ((tag ("TS_FUNCTION_DECL"))) function_decl;
2010   struct tree_translation_unit_decl GTY ((tag ("TS_TRANSLATION_UNIT_DECL")))
2011     translation_unit_decl;
2012   struct tree_type_common GTY ((tag ("TS_TYPE_COMMON"))) type_common;
2013   struct tree_type_with_lang_specific GTY ((tag ("TS_TYPE_WITH_LANG_SPECIFIC")))
2014     type_with_lang_specific;
2015   struct tree_type_non_common GTY ((tag ("TS_TYPE_NON_COMMON")))
2016     type_non_common;
2017   struct tree_list GTY ((tag ("TS_LIST"))) list;
2018   struct tree_vec GTY ((tag ("TS_VEC"))) vec;
2019   struct tree_exp GTY ((tag ("TS_EXP"))) exp;
2020   struct tree_ssa_name GTY ((tag ("TS_SSA_NAME"))) ssa_name;
2021   struct tree_block GTY ((tag ("TS_BLOCK"))) block;
2022   struct tree_binfo GTY ((tag ("TS_BINFO"))) binfo;
2023   struct tree_statement_list GTY ((tag ("TS_STATEMENT_LIST"))) stmt_list;
2024   struct tree_constructor GTY ((tag ("TS_CONSTRUCTOR"))) constructor;
2025   struct tree_omp_clause GTY ((tag ("TS_OMP_CLAUSE"))) omp_clause;
2026   struct tree_optimization_option GTY ((tag ("TS_OPTIMIZATION"))) optimization;
2027   struct tree_target_option GTY ((tag ("TS_TARGET_OPTION"))) target_option;
2028 };
2029
2030 /* Structure describing an attribute and a function to handle it.  */
2031 struct attribute_spec {
2032   /* The name of the attribute (without any leading or trailing __),
2033      or NULL to mark the end of a table of attributes.  */
2034   const char *name;
2035   /* The minimum length of the list of arguments of the attribute.  */
2036   int min_length;
2037   /* The maximum length of the list of arguments of the attribute
2038      (-1 for no maximum).  */
2039   int max_length;
2040   /* Whether this attribute requires a DECL.  If it does, it will be passed
2041      from types of DECLs, function return types and array element types to
2042      the DECLs, function types and array types respectively; but when
2043      applied to a type in any other circumstances, it will be ignored with
2044      a warning.  (If greater control is desired for a given attribute,
2045      this should be false, and the flags argument to the handler may be
2046      used to gain greater control in that case.)  */
2047   bool decl_required;
2048   /* Whether this attribute requires a type.  If it does, it will be passed
2049      from a DECL to the type of that DECL.  */
2050   bool type_required;
2051   /* Whether this attribute requires a function (or method) type.  If it does,
2052      it will be passed from a function pointer type to the target type,
2053      and from a function return type (which is not itself a function
2054      pointer type) to the function type.  */
2055   bool function_type_required;
2056   /* Specifies if attribute affects type's identity.  */
2057   bool affects_type_identity;
2058   /* Function to handle this attribute.  NODE points to the node to which
2059      the attribute is to be applied.  If a DECL, it should be modified in
2060      place; if a TYPE, a copy should be created.  NAME is the canonicalized
2061      name of the attribute i.e. without any leading or trailing underscores.
2062      ARGS is the TREE_LIST of the arguments (which may be NULL).  FLAGS gives
2063      further information about the context of the attribute.  Afterwards, the
2064      attributes will be added to the DECL_ATTRIBUTES or TYPE_ATTRIBUTES, as
2065      appropriate, unless *NO_ADD_ATTRS is set to true (which should be done on
2066      error, as well as in any other cases when the attributes should not be
2067      added to the DECL or TYPE).  Depending on FLAGS, any attributes to be
2068      applied to another type or DECL later may be returned;
2069      otherwise the return value should be NULL_TREE.  This pointer may be
2070      NULL if no special handling is required beyond the checks implied
2071      by the rest of this structure.  */
2072   tree (*handler) (tree *node, tree name, tree args,
2073                    int flags, bool *no_add_attrs);
2074
2075   /* Specifies the name of an attribute that's mutually exclusive with
2076      this one, and whether the relationship applies to the function,
2077      variable, or type form of the attribute.  */
2078   struct exclusions {
2079     const char *name;
2080     bool function;
2081     bool variable;
2082     bool type;
2083   };
2084
2085   /* An array of attribute exclusions describing names of other attributes
2086      that this attribute is mutually exclusive with.  */
2087   const exclusions *exclude;
2088 };
2089
2090 /* These functions allow a front-end to perform a manual layout of a
2091    RECORD_TYPE.  (For instance, if the placement of subsequent fields
2092    depends on the placement of fields so far.)  Begin by calling
2093    start_record_layout.  Then, call place_field for each of the
2094    fields.  Then, call finish_record_layout.  See layout_type for the
2095    default way in which these functions are used.  */
2096 typedef struct record_layout_info_s {
2097   /* The RECORD_TYPE that we are laying out.  */
2098   tree t;
2099   /* The offset into the record so far, in bytes, not including bits in
2100      BITPOS.  */
2101   tree offset;
2102   /* The last known alignment of SIZE.  */
2103   unsigned int offset_align;
2104   /* The bit position within the last OFFSET_ALIGN bits, in bits.  */
2105   tree bitpos;
2106   /* The alignment of the record so far, in bits.  */
2107   unsigned int record_align;
2108   /* The alignment of the record so far, ignoring #pragma pack and
2109      __attribute__ ((packed)), in bits.  */
2110   unsigned int unpacked_align;
2111   /* The previous field laid out.  */
2112   tree prev_field;
2113   /* The static variables (i.e., class variables, as opposed to
2114      instance variables) encountered in T.  */
2115   vec<tree, va_gc> *pending_statics;
2116   /* Bits remaining in the current alignment group */
2117   int remaining_in_alignment;
2118   /* True if we've seen a packed field that didn't have normal
2119      alignment anyway.  */
2120   int packed_maybe_necessary;
2121 } *record_layout_info;
2122
2123 /* Iterator for going through the function arguments.  */
2124 struct function_args_iterator {
2125   tree next;                    /* TREE_LIST pointing to the next argument */
2126 };
2127
2128 /* Structures to map from a tree to another tree.  */
2129 struct GTY(()) tree_map_base {
2130   tree from;
2131 };
2132
2133 /* Map from a tree to another tree.  */
2134
2135 struct GTY((for_user)) tree_map {
2136   struct tree_map_base base;
2137   unsigned int hash;
2138   tree to;
2139 };
2140
2141 /* Map from a decl tree to another tree.  */
2142 struct GTY((for_user)) tree_decl_map {
2143   struct tree_map_base base;
2144   tree to;
2145 };
2146
2147 /* Map from a tree to an int.  */
2148 struct GTY((for_user)) tree_int_map {
2149   struct tree_map_base base;
2150   unsigned int to;
2151 };
2152
2153 /* Map from a decl tree to a tree vector.  */
2154 struct GTY((for_user)) tree_vec_map {
2155   struct tree_map_base base;
2156   vec<tree, va_gc> *to;
2157 };
2158
2159 /* Abstract iterators for CALL_EXPRs.  These static inline definitions
2160    have to go towards the end of tree.h so that union tree_node is fully
2161    defined by this point.  */
2162
2163 /* Structure containing iterator state.  */
2164 struct call_expr_arg_iterator {
2165   tree t;       /* the call_expr */
2166   int n;        /* argument count */
2167   int i;        /* next argument index */
2168 };
2169
2170 struct const_call_expr_arg_iterator {
2171   const_tree t; /* the call_expr */
2172   int n;        /* argument count */
2173   int i;        /* next argument index */
2174 };
2175
2176 /* The builtin_info structure holds the FUNCTION_DECL of the standard builtin
2177    function, and flags.  */
2178 struct GTY(()) builtin_info_type {
2179   tree decl;
2180   /* Whether the user can use <xxx> instead of explicitly using calls
2181      to __builtin_<xxx>.  */
2182   unsigned implicit_p : 1;
2183   /* Whether the user has provided a declaration of <xxx>.  */
2184   unsigned declared_p : 1;
2185 };
2186
2187 /* Information about a _FloatN or _FloatNx type that may be
2188    supported.  */
2189 struct floatn_type_info {
2190   /* The number N in the type name.  */
2191   int n;
2192   /* Whether it is an extended type _FloatNx (true) or an interchange
2193      type (false).  */
2194   bool extended;
2195 };
2196
2197
2198 /*---------------------------------------------------------------------------
2199                                 Global variables
2200 ---------------------------------------------------------------------------*/
2201 /* Matrix describing the structures contained in a given tree code.  */
2202 extern bool tree_contains_struct[MAX_TREE_CODES][64];
2203
2204 /* Class of tree given its code.  */
2205 extern const enum tree_code_class tree_code_type[];
2206
2207 /* Each tree code class has an associated string representation.
2208    These must correspond to the tree_code_class entries.  */
2209 extern const char *const tree_code_class_strings[];
2210
2211 /* Number of argument-words in each kind of tree-node.  */
2212 extern const unsigned char tree_code_length[];
2213
2214 /* Vector of all alias pairs for global symbols.  */
2215 extern GTY(()) vec<alias_pair, va_gc> *alias_pairs;
2216
2217 /* Names of all the built_in classes.  */
2218 extern const char *const built_in_class_names[BUILT_IN_LAST];
2219
2220 /* Names of all the built_in functions.  */
2221 extern const char * built_in_names[(int) END_BUILTINS];
2222
2223 /* Number of operands and names for each OMP_CLAUSE node.  */
2224 extern unsigned const char omp_clause_num_ops[];
2225 extern const char * const omp_clause_code_name[];
2226
2227 /* A vector of all translation-units.  */
2228 extern GTY (()) vec<tree, va_gc> *all_translation_units;
2229
2230 /* Vector of standard trees used by the C compiler.  */
2231 extern GTY(()) tree global_trees[TI_MAX];
2232
2233 /* The standard C integer types.  Use integer_type_kind to index into
2234    this array.  */
2235 extern GTY(()) tree integer_types[itk_none];
2236
2237 /* Types used to represent sizes.  */
2238 extern GTY(()) tree sizetype_tab[(int) stk_type_kind_last];
2239
2240 /* Arrays for keeping track of tree node statistics.  */
2241 extern uint64_t tree_node_counts[];
2242 extern uint64_t tree_node_sizes[];
2243
2244 /* True if we are in gimple form and the actions of the folders need to
2245    be restricted.  False if we are not in gimple form and folding is not
2246    restricted to creating gimple expressions.  */
2247 extern bool in_gimple_form;
2248
2249 /* Functional interface to the builtin functions.  */
2250 extern GTY(()) builtin_info_type builtin_info[(int)END_BUILTINS];
2251
2252 /* If nonzero, an upper limit on alignment of structure fields, in bits,  */
2253 extern unsigned int maximum_field_alignment;
2254
2255 /* Points to the FUNCTION_DECL of the function whose body we are reading.  */
2256 extern GTY(()) tree current_function_decl;
2257
2258 /* Nonzero means a FUNC_BEGIN label was emitted.  */
2259 extern GTY(()) const char * current_function_func_begin_label;
2260
2261 /* Information about the _FloatN and _FloatNx types.  */
2262 extern const floatn_type_info floatn_nx_types[NUM_FLOATN_NX_TYPES];
2263
2264 #endif  // GCC_TREE_CORE_H