gcc/tree-streamer-out.c

   1 /* Routines for emitting trees to a file stream.
   2
   3    Copyright (C) 2011-2017 Free Software Foundation, Inc.
   4    Contributed by Diego Novillo <dnovillo@google.com>
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "backend.h"
  26 #include "target.h"
  27 #include "tree.h"
  28 #include "gimple.h"
  29 #include "tree-streamer.h"
  30 #include "cgraph.h"
  31 #include "alias.h"
  32 #include "stor-layout.h"
  33 #include "gomp-constants.h"
  34
  35
  36 /* Output the STRING constant to the string
  37    table in OB.  Then put the index onto the INDEX_STREAM.  */
  38
  39 void
  40 streamer_write_string_cst (struct output_block *ob,
  41                            struct lto_output_stream *index_stream,
  42                            tree string)
  43 {
  44   streamer_write_string_with_length (ob, index_stream,
  45                                      string ? TREE_STRING_POINTER (string)
  46                                             : NULL,
  47                                      string ? TREE_STRING_LENGTH (string) : 0,
  48                                      true);
  49 }
  50
  51
  52 /* Output the identifier ID to the string
  53    table in OB.  Then put the index onto the INDEX_STREAM.  */
  54
  55 static void
  56 write_identifier (struct output_block *ob,
  57                    struct lto_output_stream *index_stream,
  58                    tree id)
  59 {
  60   streamer_write_string_with_length (ob, index_stream,
  61                                      IDENTIFIER_POINTER (id),
  62                                      IDENTIFIER_LENGTH (id),
  63                                      true);
  64 }
  65
  66
  67 /* Pack all the non-pointer fields of the TS_BASE structure of
  68    expression EXPR into bitpack BP.  */
  69
  70 static inline void
  71 pack_ts_base_value_fields (struct bitpack_d *bp, tree expr)
  72 {
  73   bp_pack_value (bp, TREE_CODE (expr), 16);
  74   if (!TYPE_P (expr))
  75     {
  76       bp_pack_value (bp, TREE_SIDE_EFFECTS (expr), 1);
  77       bp_pack_value (bp, TREE_CONSTANT (expr), 1);
  78       bp_pack_value (bp, TREE_READONLY (expr), 1);
  79
  80       /* TREE_PUBLIC is used on types to indicate that the type
  81          has a TYPE_CACHED_VALUES vector.  This is not streamed out,
  82          so we skip it here.  */
  83       bp_pack_value (bp, TREE_PUBLIC (expr), 1);
  84     }
  85   else
  86     bp_pack_value (bp, 0, 4);
  87   bp_pack_value (bp, TREE_ADDRESSABLE (expr), 1);
  88   bp_pack_value (bp, TREE_THIS_VOLATILE (expr), 1);
  89   if (DECL_P (expr))
  90     {
  91       bp_pack_value (bp, DECL_UNSIGNED (expr), 1);
  92       bp_pack_value (bp, DECL_NAMELESS (expr), 1);
  93     }
  94   else if (TYPE_P (expr))
  95     bp_pack_value (bp, TYPE_UNSIGNED (expr), 1);
  96   else
  97     bp_pack_value (bp, 0, 1);
  98   /* We write debug info two times, do not confuse the second one.
  99      The only relevant TREE_ASM_WRITTEN use is on SSA names.  */
 100   bp_pack_value (bp, (TREE_CODE (expr) != SSA_NAME
 101                       ? 0 : TREE_ASM_WRITTEN (expr)), 1);
 102   if (TYPE_P (expr))
 103     bp_pack_value (bp, TYPE_ARTIFICIAL (expr), 1);
 104   else
 105     bp_pack_value (bp, TREE_NO_WARNING (expr), 1);
 106   bp_pack_value (bp, TREE_NOTHROW (expr), 1);
 107   bp_pack_value (bp, TREE_STATIC (expr), 1);
 108   if (TREE_CODE (expr) != TREE_BINFO)
 109     bp_pack_value (bp, TREE_PRIVATE (expr), 1);
 110   else
 111     bp_pack_value (bp, 0, 1);
 112   bp_pack_value (bp, TREE_PROTECTED (expr), 1);
 113   bp_pack_value (bp, TREE_DEPRECATED (expr), 1);
 114   if (TYPE_P (expr))
 115     {
 116       if (AGGREGATE_TYPE_P (expr))
 117         bp_pack_value (bp, TYPE_REVERSE_STORAGE_ORDER (expr), 1);
 118       else
 119         bp_pack_value (bp, TYPE_SATURATING (expr), 1);
 120       bp_pack_value (bp, TYPE_ADDR_SPACE (expr), 8);
 121     }
 122   else if (TREE_CODE (expr) == BIT_FIELD_REF || TREE_CODE (expr) == MEM_REF)
 123     {
 124       bp_pack_value (bp, REF_REVERSE_STORAGE_ORDER (expr), 1);
 125       bp_pack_value (bp, 0, 8);
 126     }
 127   else if (TREE_CODE (expr) == SSA_NAME)
 128     {
 129       bp_pack_value (bp, SSA_NAME_IS_DEFAULT_DEF (expr), 1);
 130       bp_pack_value (bp, 0, 8);
 131     }
 132   else
 133     bp_pack_value (bp, 0, 9);
 134 }
 135
 136
 137 /* Pack all the non-pointer fields of the TS_INTEGER_CST structure of
 138    expression EXPR into bitpack BP.  */
 139
 140 static void
 141 pack_ts_int_cst_value_fields (struct bitpack_d *bp, tree expr)
 142 {
 143   int i;
 144   /* Note that the number of elements has already been written out in
 145      streamer_write_tree_header.  */
 146   for (i = 0; i < TREE_INT_CST_EXT_NUNITS (expr); i++)
 147     bp_pack_var_len_int (bp, TREE_INT_CST_ELT (expr, i));
 148 }
 149
 150
 151 /* Pack all the non-pointer fields of the TS_REAL_CST structure of
 152    expression EXPR into bitpack BP.  */
 153
 154 static void
 155 pack_ts_real_cst_value_fields (struct bitpack_d *bp, tree expr)
 156 {
 157   unsigned i;
 158   REAL_VALUE_TYPE r;
 159
 160   r = TREE_REAL_CST (expr);
 161   bp_pack_value (bp, r.cl, 2);
 162   bp_pack_value (bp, r.decimal, 1);
 163   bp_pack_value (bp, r.sign, 1);
 164   bp_pack_value (bp, r.signalling, 1);
 165   bp_pack_value (bp, r.canonical, 1);
 166   bp_pack_value (bp, r.uexp, EXP_BITS);
 167   for (i = 0; i < SIGSZ; i++)
 168     bp_pack_value (bp, r.sig[i], HOST_BITS_PER_LONG);
 169 }
 170
 171
 172 /* Pack all the non-pointer fields of the TS_FIXED_CST structure of
 173    expression EXPR into bitpack BP.  */
 174
 175 static void
 176 pack_ts_fixed_cst_value_fields (struct bitpack_d *bp, tree expr)
 177 {
 178   struct fixed_value fv = TREE_FIXED_CST (expr);
 179   bp_pack_machine_mode (bp, fv.mode);
 180   bp_pack_var_len_int (bp, fv.data.low);
 181   bp_pack_var_len_int (bp, fv.data.high);
 182 }
 183
 184 /* Pack all the non-pointer fields of the TS_DECL_COMMON structure
 185    of expression EXPR into bitpack BP.  */
 186
 187 static void
 188 pack_ts_decl_common_value_fields (struct bitpack_d *bp, tree expr)
 189 {
 190   bp_pack_machine_mode (bp, DECL_MODE (expr));
 191   bp_pack_value (bp, DECL_NONLOCAL (expr), 1);
 192   bp_pack_value (bp, DECL_VIRTUAL_P (expr), 1);
 193   bp_pack_value (bp, DECL_IGNORED_P (expr), 1);
 194   bp_pack_value (bp, DECL_ABSTRACT_P (expr), 1);
 195   bp_pack_value (bp, DECL_ARTIFICIAL (expr), 1);
 196   bp_pack_value (bp, DECL_USER_ALIGN (expr), 1);
 197   bp_pack_value (bp, DECL_PRESERVE_P (expr), 1);
 198   bp_pack_value (bp, DECL_EXTERNAL (expr), 1);
 199   bp_pack_value (bp, DECL_GIMPLE_REG_P (expr), 1);
 200   bp_pack_var_len_unsigned (bp, DECL_ALIGN (expr));
 201
 202   if (TREE_CODE (expr) == LABEL_DECL)
 203     {
 204       /* Note that we do not write LABEL_DECL_UID.  The reader will
 205          always assume an initial value of -1 so that the
 206          label_to_block_map is recreated by gimple_set_bb.  */
 207       bp_pack_var_len_unsigned (bp, EH_LANDING_PAD_NR (expr));
 208     }
 209
 210   if (TREE_CODE (expr) == FIELD_DECL)
 211     {
 212       bp_pack_value (bp, DECL_PACKED (expr), 1);
 213       bp_pack_value (bp, DECL_NONADDRESSABLE_P (expr), 1);
 214       bp_pack_value (bp, DECL_PADDING_P (expr), 1);
 215       bp_pack_value (bp, expr->decl_common.off_align, 8);
 216     }
 217
 218   if (VAR_P (expr))
 219     {
 220       bp_pack_value (bp, DECL_HAS_DEBUG_EXPR_P (expr), 1);
 221       bp_pack_value (bp, DECL_NONLOCAL_FRAME (expr), 1);
 222     }
 223
 224   if (TREE_CODE (expr) == RESULT_DECL
 225       || TREE_CODE (expr) == PARM_DECL
 226       || VAR_P (expr))
 227     {
 228       bp_pack_value (bp, DECL_BY_REFERENCE (expr), 1);
 229       if (VAR_P (expr) || TREE_CODE (expr) == PARM_DECL)
 230         bp_pack_value (bp, DECL_HAS_VALUE_EXPR_P (expr), 1);
 231     }
 232 }
 233
 234
 235 /* Pack all the non-pointer fields of the TS_DECL_WRTL structure
 236    of expression EXPR into bitpack BP.  */
 237
 238 static void
 239 pack_ts_decl_wrtl_value_fields (struct bitpack_d *bp, tree expr)
 240 {
 241   bp_pack_value (bp, DECL_REGISTER (expr), 1);
 242 }
 243
 244
 245 /* Pack all the non-pointer fields of the TS_DECL_WITH_VIS structure
 246    of expression EXPR into bitpack BP.  */
 247
 248 static void
 249 pack_ts_decl_with_vis_value_fields (struct bitpack_d *bp, tree expr)
 250 {
 251   bp_pack_value (bp, DECL_COMMON (expr), 1);
 252   bp_pack_value (bp, DECL_DLLIMPORT_P (expr), 1);
 253   bp_pack_value (bp, DECL_WEAK (expr), 1);
 254   bp_pack_value (bp, DECL_SEEN_IN_BIND_EXPR_P (expr),  1);
 255   bp_pack_value (bp, DECL_COMDAT (expr),  1);
 256   bp_pack_value (bp, DECL_VISIBILITY (expr),  2);
 257   bp_pack_value (bp, DECL_VISIBILITY_SPECIFIED (expr),  1);
 258
 259   if (VAR_P (expr))
 260     {
 261       bp_pack_value (bp, DECL_HARD_REGISTER (expr), 1);
 262       /* DECL_IN_TEXT_SECTION is set during final asm output only. */
 263       bp_pack_value (bp, DECL_IN_CONSTANT_POOL (expr), 1);
 264     }
 265
 266   if (TREE_CODE (expr) == FUNCTION_DECL)
 267     {
 268       bp_pack_value (bp, DECL_FINAL_P (expr), 1);
 269       bp_pack_value (bp, DECL_CXX_CONSTRUCTOR_P (expr), 1);
 270       bp_pack_value (bp, DECL_CXX_DESTRUCTOR_P (expr), 1);
 271     }
 272 }
 273
 274
 275 /* Pack all the non-pointer fields of the TS_FUNCTION_DECL structure
 276    of expression EXPR into bitpack BP.  */
 277
 278 static void
 279 pack_ts_function_decl_value_fields (struct bitpack_d *bp, tree expr)
 280 {
 281   bp_pack_enum (bp, built_in_class, BUILT_IN_LAST,
 282                 DECL_BUILT_IN_CLASS (expr));
 283   bp_pack_value (bp, DECL_STATIC_CONSTRUCTOR (expr), 1);
 284   bp_pack_value (bp, DECL_STATIC_DESTRUCTOR (expr), 1);
 285   bp_pack_value (bp, DECL_UNINLINABLE (expr), 1);
 286   bp_pack_value (bp, DECL_POSSIBLY_INLINED (expr), 1);
 287   bp_pack_value (bp, DECL_IS_NOVOPS (expr), 1);
 288   bp_pack_value (bp, DECL_IS_RETURNS_TWICE (expr), 1);
 289   bp_pack_value (bp, DECL_IS_MALLOC (expr), 1);
 290   bp_pack_value (bp, DECL_IS_OPERATOR_NEW (expr), 1);
 291   bp_pack_value (bp, DECL_DECLARED_INLINE_P (expr), 1);
 292   bp_pack_value (bp, DECL_STATIC_CHAIN (expr), 1);
 293   bp_pack_value (bp, DECL_NO_INLINE_WARNING_P (expr), 1);
 294   bp_pack_value (bp, DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (expr), 1);
 295   bp_pack_value (bp, DECL_NO_LIMIT_STACK (expr), 1);
 296   bp_pack_value (bp, DECL_DISREGARD_INLINE_LIMITS (expr), 1);
 297   bp_pack_value (bp, DECL_PURE_P (expr), 1);
 298   bp_pack_value (bp, DECL_LOOPING_CONST_OR_PURE_P (expr), 1);
 299   if (DECL_BUILT_IN_CLASS (expr) != NOT_BUILT_IN)
 300     bp_pack_value (bp, DECL_FUNCTION_CODE (expr), 12);
 301 }
 302
 303
 304 /* Pack all the non-pointer fields of the TS_TYPE_COMMON structure
 305    of expression EXPR into bitpack BP.  */
 306
 307 static void
 308 pack_ts_type_common_value_fields (struct bitpack_d *bp, tree expr)
 309 {
 310   /* for VECTOR_TYPE, TYPE_MODE reevaluates the mode using target_flags
 311      not necessary valid in a global context.
 312      Use the raw value previously set by layout_type.  */
 313   bp_pack_machine_mode (bp, TYPE_MODE_RAW (expr));
 314   bp_pack_value (bp, TYPE_STRING_FLAG (expr), 1);
 315   /* TYPE_NO_FORCE_BLK is private to stor-layout and need
 316      no streaming.  */
 317   bp_pack_value (bp, TYPE_NEEDS_CONSTRUCTING (expr), 1);
 318   bp_pack_value (bp, TYPE_PACKED (expr), 1);
 319   bp_pack_value (bp, TYPE_RESTRICT (expr), 1);
 320   bp_pack_value (bp, TYPE_USER_ALIGN (expr), 1);
 321   bp_pack_value (bp, TYPE_READONLY (expr), 1);
 322   /* We used to stream TYPE_ALIAS_SET == 0 information to let frontends mark
 323      types that are opaque for TBAA.  This however did not work as intended,
 324      because TYPE_ALIAS_SET == 0 was regularly lost in type merging.  */
 325   if (RECORD_OR_UNION_TYPE_P (expr))
 326     {
 327       bp_pack_value (bp, TYPE_TRANSPARENT_AGGR (expr), 1);
 328       bp_pack_value (bp, TYPE_FINAL_P (expr), 1);
 329     }
 330   else if (TREE_CODE (expr) == ARRAY_TYPE)
 331     bp_pack_value (bp, TYPE_NONALIASED_COMPONENT (expr), 1);
 332   if (AGGREGATE_TYPE_P (expr))
 333     bp_pack_value (bp, TYPE_TYPELESS_STORAGE (expr), 1);
 334   bp_pack_value (bp, TYPE_EMPTY_P (expr), 1);
 335   bp_pack_var_len_unsigned (bp, TYPE_PRECISION (expr));
 336   bp_pack_var_len_unsigned (bp, TYPE_ALIGN (expr));
 337 }
 338
 339
 340 /* Pack all the non-pointer fields of the TS_BLOCK structure
 341    of expression EXPR into bitpack BP.  */
 342
 343 static void
 344 pack_ts_block_value_fields (struct output_block *ob,
 345                             struct bitpack_d *bp, tree expr)
 346 {
 347   bp_pack_value (bp, BLOCK_ABSTRACT (expr), 1);
 348   /* BLOCK_NUMBER is recomputed.  */
 349   /* Stream BLOCK_SOURCE_LOCATION for the limited cases we can handle - those
 350      that represent inlined function scopes.
 351      For the rest them on the floor instead of ICEing in dwarf2out.c.  */
 352   if (inlined_function_outer_scope_p (expr))
 353     stream_output_location (ob, bp, BLOCK_SOURCE_LOCATION (expr));
 354   else
 355     stream_output_location (ob, bp, UNKNOWN_LOCATION);
 356 }
 357
 358 /* Pack all the non-pointer fields of the TS_TRANSLATION_UNIT_DECL structure
 359    of expression EXPR into bitpack BP.  */
 360
 361 static void
 362 pack_ts_translation_unit_decl_value_fields (struct output_block *ob,
 363                                             struct bitpack_d *bp, tree expr)
 364 {
 365   bp_pack_string (ob, bp, TRANSLATION_UNIT_LANGUAGE (expr), true);
 366 }
 367
 368
 369 /* Pack all the non-pointer fields of the TS_OMP_CLAUSE structure
 370    of expression EXPR into bitpack BP.  */
 371
 372 static void
 373 pack_ts_omp_clause_value_fields (struct output_block *ob,
 374                                  struct bitpack_d *bp, tree expr)
 375 {
 376   stream_output_location (ob, bp, OMP_CLAUSE_LOCATION (expr));
 377   switch (OMP_CLAUSE_CODE (expr))
 378     {
 379     case OMP_CLAUSE_DEFAULT:
 380       bp_pack_enum (bp, omp_clause_default_kind, OMP_CLAUSE_DEFAULT_LAST,
 381                     OMP_CLAUSE_DEFAULT_KIND (expr));
 382       break;
 383     case OMP_CLAUSE_SCHEDULE:
 384       bp_pack_enum (bp, omp_clause_schedule_kind, OMP_CLAUSE_SCHEDULE_LAST,
 385                     OMP_CLAUSE_SCHEDULE_KIND (expr));
 386       break;
 387     case OMP_CLAUSE_DEPEND:
 388       bp_pack_enum (bp, omp_clause_depend_kind, OMP_CLAUSE_DEPEND_LAST,
 389                     OMP_CLAUSE_DEPEND_KIND (expr));
 390       break;
 391     case OMP_CLAUSE_MAP:
 392       bp_pack_enum (bp, gomp_map_kind, GOMP_MAP_LAST,
 393                     OMP_CLAUSE_MAP_KIND (expr));
 394       break;
 395     case OMP_CLAUSE_PROC_BIND:
 396       bp_pack_enum (bp, omp_clause_proc_bind_kind, OMP_CLAUSE_PROC_BIND_LAST,
 397                     OMP_CLAUSE_PROC_BIND_KIND (expr));
 398       break;
 399     case OMP_CLAUSE_REDUCTION:
 400       bp_pack_enum (bp, tree_code, MAX_TREE_CODES,
 401                     OMP_CLAUSE_REDUCTION_CODE (expr));
 402       break;
 403     default:
 404       break;
 405     }
 406 }
 407
 408
 409 /* Pack all the bitfields in EXPR into a bit pack.  */
 410
 411 void
 412 streamer_write_tree_bitfields (struct output_block *ob, tree expr)
 413 {
 414   bitpack_d bp = bitpack_create (ob->main_stream);
 415   enum tree_code code;
 416
 417   code = TREE_CODE (expr);
 418
 419   /* Note that all these functions are highly sensitive to changes in
 420      the types and sizes of each of the fields being packed.  */
 421   pack_ts_base_value_fields (&bp, expr);
 422
 423   if (CODE_CONTAINS_STRUCT (code, TS_INT_CST))
 424     pack_ts_int_cst_value_fields (&bp, expr);
 425
 426   if (CODE_CONTAINS_STRUCT (code, TS_REAL_CST))
 427     pack_ts_real_cst_value_fields (&bp, expr);
 428
 429   if (CODE_CONTAINS_STRUCT (code, TS_FIXED_CST))
 430     pack_ts_fixed_cst_value_fields (&bp, expr);
 431
 432   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 433     stream_output_location (ob, &bp, DECL_SOURCE_LOCATION (expr));
 434
 435   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 436     pack_ts_decl_common_value_fields (&bp, expr);
 437
 438   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WRTL))
 439     pack_ts_decl_wrtl_value_fields (&bp, expr);
 440
 441   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 442     pack_ts_decl_with_vis_value_fields (&bp, expr);
 443
 444   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 445     pack_ts_function_decl_value_fields (&bp, expr);
 446
 447   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 448     pack_ts_type_common_value_fields (&bp, expr);
 449
 450   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 451     {
 452       stream_output_location (ob, &bp, EXPR_LOCATION (expr));
 453       if (code == MEM_REF
 454           || code == TARGET_MEM_REF)
 455         {
 456           bp_pack_value (&bp, MR_DEPENDENCE_CLIQUE (expr), sizeof (short) * 8);
 457           if (MR_DEPENDENCE_CLIQUE (expr) != 0)
 458             bp_pack_value (&bp, MR_DEPENDENCE_BASE (expr), sizeof (short) * 8);
 459         }
 460     }
 461
 462   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 463     pack_ts_block_value_fields (ob, &bp, expr);
 464
 465   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
 466     pack_ts_translation_unit_decl_value_fields (ob, &bp, expr);
 467
 468   if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION))
 469     cl_optimization_stream_out (&bp, TREE_OPTIMIZATION (expr));
 470
 471   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 472     bp_pack_var_len_unsigned (&bp, vec_safe_length (BINFO_BASE_ACCESSES (expr)));
 473
 474   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
 475     bp_pack_var_len_unsigned (&bp, CONSTRUCTOR_NELTS (expr));
 476
 477   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION)
 478       /* Don't stream these when passing things to a different target.  */
 479       && !lto_stream_offload_p)
 480     cl_target_option_stream_out (ob, &bp, TREE_TARGET_OPTION (expr));
 481
 482   if (code == OMP_CLAUSE)
 483     pack_ts_omp_clause_value_fields (ob, &bp, expr);
 484
 485   streamer_write_bitpack (&bp);
 486 }
 487
 488
 489 /* Emit the chain of tree nodes starting at T.  OB is the output block
 490    to write to.  REF_P is true if chain elements should be emitted
 491    as references.  */
 492
 493 void
 494 streamer_write_chain (struct output_block *ob, tree t, bool ref_p)
 495 {
 496   while (t)
 497     {
 498       /* We avoid outputting external vars or functions by reference
 499          to the global decls section as we do not want to have them
 500          enter decl merging.  This is, of course, only for the call
 501          for streaming BLOCK_VARS, but other callers are safe.
 502          See also lto-streamer-out.c:DFS_write_tree_body.  */
 503       if (VAR_OR_FUNCTION_DECL_P (t)
 504           && DECL_EXTERNAL (t))
 505         stream_write_tree_shallow_non_ref (ob, t, ref_p);
 506       else
 507         stream_write_tree (ob, t, ref_p);
 508
 509       t = TREE_CHAIN (t);
 510     }
 511
 512   /* Write a sentinel to terminate the chain.  */
 513   stream_write_tree (ob, NULL_TREE, ref_p);
 514 }
 515
 516
 517 /* Write all pointer fields in the TS_COMMON structure of EXPR to output
 518    block OB.  If REF_P is true, write a reference to EXPR's pointer
 519    fields.  */
 520
 521 static void
 522 write_ts_common_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 523 {
 524   if (TREE_CODE (expr) != IDENTIFIER_NODE)
 525     stream_write_tree (ob, TREE_TYPE (expr), ref_p);
 526 }
 527
 528
 529 /* Write all pointer fields in the TS_VECTOR structure of EXPR to output
 530    block OB.  If REF_P is true, write a reference to EXPR's pointer
 531    fields.  */
 532
 533 static void
 534 write_ts_vector_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 535 {
 536   /* Note that the number of elements for EXPR has already been emitted
 537      in EXPR's header (see streamer_write_tree_header).  */
 538   unsigned int count = vector_cst_encoded_nelts (expr);
 539   for (unsigned int i = 0; i < count; ++i)
 540     stream_write_tree (ob, VECTOR_CST_ENCODED_ELT (expr, i), ref_p);
 541 }
 542
 543
 544 /* Write all pointer fields in the TS_COMPLEX structure of EXPR to output
 545    block OB.  If REF_P is true, write a reference to EXPR's pointer
 546    fields.  */
 547
 548 static void
 549 write_ts_complex_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 550 {
 551   stream_write_tree (ob, TREE_REALPART (expr), ref_p);
 552   stream_write_tree (ob, TREE_IMAGPART (expr), ref_p);
 553 }
 554
 555
 556 /* Write all pointer fields in the TS_DECL_MINIMAL structure of EXPR
 557    to output block OB.  If REF_P is true, write a reference to EXPR's
 558    pointer fields.  */
 559
 560 static void
 561 write_ts_decl_minimal_tree_pointers (struct output_block *ob, tree expr,
 562                                      bool ref_p)
 563 {
 564   /* Drop names that were created for anonymous entities.  */
 565   if (DECL_NAME (expr)
 566       && TREE_CODE (DECL_NAME (expr)) == IDENTIFIER_NODE
 567       && anon_aggrname_p (DECL_NAME (expr)))
 568     stream_write_tree (ob, NULL_TREE, ref_p);
 569   else
 570     stream_write_tree (ob, DECL_NAME (expr), ref_p);
 571   if (TREE_CODE (expr) != TRANSLATION_UNIT_DECL
 572       && ! DECL_CONTEXT (expr))
 573     stream_write_tree (ob, (*all_translation_units)[0], ref_p);
 574   else
 575     stream_write_tree (ob, DECL_CONTEXT (expr), ref_p);
 576 }
 577
 578
 579 /* Write all pointer fields in the TS_DECL_COMMON structure of EXPR to
 580    output block OB.  If REF_P is true, write a reference to EXPR's
 581    pointer fields.  */
 582
 583 static void
 584 write_ts_decl_common_tree_pointers (struct output_block *ob, tree expr,
 585                                     bool ref_p)
 586 {
 587   stream_write_tree (ob, DECL_SIZE (expr), ref_p);
 588   stream_write_tree (ob, DECL_SIZE_UNIT (expr), ref_p);
 589
 590   /* Note, DECL_INITIAL is not handled here.  Since DECL_INITIAL needs
 591      special handling in LTO, it must be handled by streamer hooks.  */
 592
 593   stream_write_tree (ob, DECL_ATTRIBUTES (expr), ref_p);
 594   stream_write_tree (ob, DECL_ABSTRACT_ORIGIN (expr), ref_p);
 595
 596   if ((VAR_P (expr) || TREE_CODE (expr) == PARM_DECL)
 597       && DECL_HAS_VALUE_EXPR_P (expr))
 598     stream_write_tree (ob, DECL_VALUE_EXPR (expr), ref_p);
 599
 600   if (VAR_P (expr))
 601     stream_write_tree (ob, DECL_DEBUG_EXPR (expr), ref_p);
 602 }
 603
 604
 605 /* Write all pointer fields in the TS_DECL_NON_COMMON structure of
 606    EXPR to output block OB.  If REF_P is true, write a reference to EXPR's
 607    pointer fields.  */
 608
 609 static void
 610 write_ts_decl_non_common_tree_pointers (struct output_block *ob, tree expr,
 611                                         bool ref_p)
 612 {
 613   if (TREE_CODE (expr) == TYPE_DECL)
 614     stream_write_tree (ob, DECL_ORIGINAL_TYPE (expr), ref_p);
 615 }
 616
 617
 618 /* Write all pointer fields in the TS_DECL_WITH_VIS structure of EXPR
 619    to output block OB.  If REF_P is true, write a reference to EXPR's
 620    pointer fields.  */
 621
 622 static void
 623 write_ts_decl_with_vis_tree_pointers (struct output_block *ob, tree expr,
 624                                       bool ref_p)
 625 {
 626   /* Make sure we don't inadvertently set the assembler name.  */
 627   if (DECL_ASSEMBLER_NAME_SET_P (expr))
 628     stream_write_tree (ob, DECL_ASSEMBLER_NAME (expr), ref_p);
 629   else
 630     stream_write_tree (ob, NULL_TREE, false);
 631 }
 632
 633
 634 /* Write all pointer fields in the TS_FIELD_DECL structure of EXPR to
 635    output block OB.  If REF_P is true, write a reference to EXPR's
 636    pointer fields.  */
 637
 638 static void
 639 write_ts_field_decl_tree_pointers (struct output_block *ob, tree expr,
 640                                    bool ref_p)
 641 {
 642   stream_write_tree (ob, DECL_FIELD_OFFSET (expr), ref_p);
 643   stream_write_tree (ob, DECL_BIT_FIELD_TYPE (expr), ref_p);
 644   stream_write_tree (ob, DECL_BIT_FIELD_REPRESENTATIVE (expr), ref_p);
 645   stream_write_tree (ob, DECL_FIELD_BIT_OFFSET (expr), ref_p);
 646   stream_write_tree (ob, DECL_FCONTEXT (expr), ref_p);
 647 }
 648
 649
 650 /* Write all pointer fields in the TS_FUNCTION_DECL structure of EXPR
 651    to output block OB.  If REF_P is true, write a reference to EXPR's
 652    pointer fields.  */
 653
 654 static void
 655 write_ts_function_decl_tree_pointers (struct output_block *ob, tree expr,
 656                                       bool ref_p)
 657 {
 658   stream_write_tree (ob, DECL_VINDEX (expr), ref_p);
 659   /* DECL_STRUCT_FUNCTION is handled by lto_output_function.  */
 660   stream_write_tree (ob, DECL_FUNCTION_PERSONALITY (expr), ref_p);
 661   /* Don't stream these when passing things to a different target.  */
 662   if (!lto_stream_offload_p)
 663     stream_write_tree (ob, DECL_FUNCTION_SPECIFIC_TARGET (expr), ref_p);
 664   stream_write_tree (ob, DECL_FUNCTION_SPECIFIC_OPTIMIZATION (expr), ref_p);
 665 }
 666
 667
 668 /* Write all pointer fields in the TS_TYPE_COMMON structure of EXPR to
 669    output block OB.  If REF_P is true, write a reference to EXPR's
 670    pointer fields.  */
 671
 672 static void
 673 write_ts_type_common_tree_pointers (struct output_block *ob, tree expr,
 674                                     bool ref_p)
 675 {
 676   stream_write_tree (ob, TYPE_SIZE (expr), ref_p);
 677   stream_write_tree (ob, TYPE_SIZE_UNIT (expr), ref_p);
 678   stream_write_tree (ob, TYPE_ATTRIBUTES (expr), ref_p);
 679   stream_write_tree (ob, TYPE_NAME (expr), ref_p);
 680   /* Do not stream TYPE_POINTER_TO or TYPE_REFERENCE_TO.  They will be
 681      reconstructed during fixup.  */
 682   /* Do not stream TYPE_NEXT_VARIANT, we reconstruct the variant lists
 683      during fixup.  */
 684   stream_write_tree (ob, TYPE_MAIN_VARIANT (expr), ref_p);
 685   stream_write_tree (ob, TYPE_CONTEXT (expr), ref_p);
 686   /* TYPE_CANONICAL is re-computed during type merging, so no need
 687      to stream it here.  */
 688   stream_write_tree (ob, TYPE_STUB_DECL (expr), ref_p);
 689 }
 690
 691 /* Write all pointer fields in the TS_TYPE_NON_COMMON structure of EXPR
 692    to output block OB.  If REF_P is true, write a reference to EXPR's
 693    pointer fields.  */
 694
 695 static void
 696 write_ts_type_non_common_tree_pointers (struct output_block *ob, tree expr,
 697                                         bool ref_p)
 698 {
 699   if (TREE_CODE (expr) == ENUMERAL_TYPE)
 700     stream_write_tree (ob, TYPE_VALUES (expr), ref_p);
 701   else if (TREE_CODE (expr) == ARRAY_TYPE)
 702     stream_write_tree (ob, TYPE_DOMAIN (expr), ref_p);
 703   else if (RECORD_OR_UNION_TYPE_P (expr))
 704     streamer_write_chain (ob, TYPE_FIELDS (expr), ref_p);
 705   else if (TREE_CODE (expr) == FUNCTION_TYPE
 706            || TREE_CODE (expr) == METHOD_TYPE)
 707     stream_write_tree (ob, TYPE_ARG_TYPES (expr), ref_p);
 708
 709   if (!POINTER_TYPE_P (expr))
 710     stream_write_tree (ob, TYPE_MIN_VALUE_RAW (expr), ref_p);
 711   stream_write_tree (ob, TYPE_MAX_VALUE_RAW (expr), ref_p);
 712 }
 713
 714
 715 /* Write all pointer fields in the TS_LIST structure of EXPR to output
 716    block OB.  If REF_P is true, write a reference to EXPR's pointer
 717    fields.  */
 718
 719 static void
 720 write_ts_list_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 721 {
 722   stream_write_tree (ob, TREE_PURPOSE (expr), ref_p);
 723   stream_write_tree (ob, TREE_VALUE (expr), ref_p);
 724   stream_write_tree (ob, TREE_CHAIN (expr), ref_p);
 725 }
 726
 727
 728 /* Write all pointer fields in the TS_VEC structure of EXPR to output
 729    block OB.  If REF_P is true, write a reference to EXPR's pointer
 730    fields.  */
 731
 732 static void
 733 write_ts_vec_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 734 {
 735   int i;
 736
 737   /* Note that the number of slots for EXPR has already been emitted
 738      in EXPR's header (see streamer_write_tree_header).  */
 739   for (i = 0; i < TREE_VEC_LENGTH (expr); i++)
 740     stream_write_tree (ob, TREE_VEC_ELT (expr, i), ref_p);
 741 }
 742
 743
 744 /* Write all pointer fields in the TS_EXP structure of EXPR to output
 745    block OB.  If REF_P is true, write a reference to EXPR's pointer
 746    fields.  */
 747
 748 static void
 749 write_ts_exp_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 750 {
 751   int i;
 752
 753   for (i = 0; i < TREE_OPERAND_LENGTH (expr); i++)
 754     stream_write_tree (ob, TREE_OPERAND (expr, i), ref_p);
 755   stream_write_tree (ob, TREE_BLOCK (expr), ref_p);
 756 }
 757
 758
 759 /* Write all pointer fields in the TS_BLOCK structure of EXPR to output
 760    block OB.  If REF_P is true, write a reference to EXPR's pointer
 761    fields.  */
 762
 763 static void
 764 write_ts_block_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 765 {
 766   streamer_write_chain (ob, BLOCK_VARS (expr), ref_p);
 767
 768   stream_write_tree (ob, BLOCK_SUPERCONTEXT (expr), ref_p);
 769
 770   /* Stream BLOCK_ABSTRACT_ORIGIN for the limited cases we can handle - those
 771      that represent inlined function scopes.
 772      For the rest them on the floor instead of ICEing in dwarf2out.c, but
 773      keep the notion of whether the block is an inlined block by refering
 774      to itself for the sake of tree_nonartificial_location.  */
 775   if (inlined_function_outer_scope_p (expr))
 776     {
 777       tree ultimate_origin = block_ultimate_origin (expr);
 778       stream_write_tree (ob, ultimate_origin, ref_p);
 779     }
 780   else
 781     stream_write_tree (ob, (BLOCK_ABSTRACT_ORIGIN (expr)
 782                             ? expr : NULL_TREE), ref_p);
 783   /* Do not stream BLOCK_NONLOCALIZED_VARS.  We cannot handle debug information
 784      for early inlined BLOCKs so drop it on the floor instead of ICEing in
 785      dwarf2out.c.  */
 786
 787   /* BLOCK_FRAGMENT_ORIGIN and BLOCK_FRAGMENT_CHAIN is not live at LTO
 788      streaming time.  */
 789
 790   /* Do not output BLOCK_SUBBLOCKS.  Instead on streaming-in this
 791      list is re-constructed from BLOCK_SUPERCONTEXT.  */
 792 }
 793
 794
 795 /* Write all pointer fields in the TS_BINFO structure of EXPR to output
 796    block OB.  If REF_P is true, write a reference to EXPR's pointer
 797    fields.  */
 798
 799 static void
 800 write_ts_binfo_tree_pointers (struct output_block *ob, tree expr, bool ref_p)
 801 {
 802   unsigned i;
 803   tree t;
 804
 805   /* Note that the number of BINFO slots has already been emitted in
 806      EXPR's header (see streamer_write_tree_header) because this length
 807      is needed to build the empty BINFO node on the reader side.  */
 808   FOR_EACH_VEC_ELT (*BINFO_BASE_BINFOS (expr), i, t)
 809     stream_write_tree (ob, t, ref_p);
 810   stream_write_tree (ob, NULL_TREE, false);
 811
 812   stream_write_tree (ob, BINFO_OFFSET (expr), ref_p);
 813   stream_write_tree (ob, BINFO_VTABLE (expr), ref_p);
 814   stream_write_tree (ob, BINFO_VPTR_FIELD (expr), ref_p);
 815
 816   /* The number of BINFO_BASE_ACCESSES has already been emitted in
 817      EXPR's bitfield section.  */
 818   FOR_EACH_VEC_SAFE_ELT (BINFO_BASE_ACCESSES (expr), i, t)
 819     stream_write_tree (ob, t, ref_p);
 820
 821   /* Do not walk BINFO_INHERITANCE_CHAIN, BINFO_SUBVTT_INDEX
 822      and BINFO_VPTR_INDEX; these are used by C++ FE only.  */
 823 }
 824
 825
 826 /* Write all pointer fields in the TS_CONSTRUCTOR structure of EXPR to
 827    output block OB.  If REF_P is true, write a reference to EXPR's
 828    pointer fields.  */
 829
 830 static void
 831 write_ts_constructor_tree_pointers (struct output_block *ob, tree expr,
 832                                     bool ref_p)
 833 {
 834   unsigned i;
 835   tree index, value;
 836
 837   FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (expr), i, index, value)
 838     {
 839       stream_write_tree (ob, index, ref_p);
 840       stream_write_tree (ob, value, ref_p);
 841     }
 842 }
 843
 844
 845 /* Write all pointer fields in the TS_OMP_CLAUSE structure of EXPR
 846    to output block OB.  If REF_P is true, write a reference to EXPR's
 847    pointer fields.  */
 848
 849 static void
 850 write_ts_omp_clause_tree_pointers (struct output_block *ob, tree expr,
 851                                    bool ref_p)
 852 {
 853   int i;
 854   for (i = 0; i < omp_clause_num_ops[OMP_CLAUSE_CODE (expr)]; i++)
 855     stream_write_tree (ob, OMP_CLAUSE_OPERAND (expr, i), ref_p);
 856   if (OMP_CLAUSE_CODE (expr) == OMP_CLAUSE_REDUCTION)
 857     {
 858       /* We don't stream these right now, handle it if streaming
 859          of them is needed.  */
 860       gcc_assert (OMP_CLAUSE_REDUCTION_GIMPLE_INIT (expr) == NULL);
 861       gcc_assert (OMP_CLAUSE_REDUCTION_GIMPLE_MERGE (expr) == NULL);
 862     }
 863   stream_write_tree (ob, OMP_CLAUSE_CHAIN (expr), ref_p);
 864 }
 865
 866
 867 /* Write all pointer fields in EXPR to output block OB.  If REF_P is true,
 868    the leaves of EXPR are emitted as references.  */
 869
 870 void
 871 streamer_write_tree_body (struct output_block *ob, tree expr, bool ref_p)
 872 {
 873   enum tree_code code;
 874
 875   lto_stats.num_tree_bodies_output++;
 876
 877   code = TREE_CODE (expr);
 878
 879   if (CODE_CONTAINS_STRUCT (code, TS_TYPED))
 880     write_ts_common_tree_pointers (ob, expr, ref_p);
 881
 882   if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 883     write_ts_vector_tree_pointers (ob, expr, ref_p);
 884
 885   if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX))
 886     write_ts_complex_tree_pointers (ob, expr, ref_p);
 887
 888   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 889     write_ts_decl_minimal_tree_pointers (ob, expr, ref_p);
 890
 891   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 892     write_ts_decl_common_tree_pointers (ob, expr, ref_p);
 893
 894   if (CODE_CONTAINS_STRUCT (code, TS_DECL_NON_COMMON))
 895     write_ts_decl_non_common_tree_pointers (ob, expr, ref_p);
 896
 897   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 898     write_ts_decl_with_vis_tree_pointers (ob, expr, ref_p);
 899
 900   if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL))
 901     write_ts_field_decl_tree_pointers (ob, expr, ref_p);
 902
 903   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 904     write_ts_function_decl_tree_pointers (ob, expr, ref_p);
 905
 906   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 907     write_ts_type_common_tree_pointers (ob, expr, ref_p);
 908
 909   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON))
 910     write_ts_type_non_common_tree_pointers (ob, expr, ref_p);
 911
 912   if (CODE_CONTAINS_STRUCT (code, TS_LIST))
 913     write_ts_list_tree_pointers (ob, expr, ref_p);
 914
 915   if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 916     write_ts_vec_tree_pointers (ob, expr, ref_p);
 917
 918   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 919     write_ts_exp_tree_pointers (ob, expr, ref_p);
 920
 921   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 922     write_ts_block_tree_pointers (ob, expr, ref_p);
 923
 924   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 925     write_ts_binfo_tree_pointers (ob, expr, ref_p);
 926
 927   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
 928     write_ts_constructor_tree_pointers (ob, expr, ref_p);
 929
 930   if (code == OMP_CLAUSE)
 931     write_ts_omp_clause_tree_pointers (ob, expr, ref_p);
 932 }
 933
 934
 935 /* Emit header information for tree EXPR to output block OB.  The header
 936    contains everything needed to instantiate an empty skeleton for
 937    EXPR on the reading side.  IX is the index into the streamer cache
 938    where EXPR is stored.  */
 939
 940 void
 941 streamer_write_tree_header (struct output_block *ob, tree expr)
 942 {
 943   enum LTO_tags tag;
 944   enum tree_code code;
 945
 946   /* We should not see any tree nodes not handled by the streamer.  */
 947   code = TREE_CODE (expr);
 948
 949   /* The header of a tree node consists of its tag, the size of
 950      the node, and any other information needed to instantiate
 951      EXPR on the reading side (such as the number of slots in
 952      variable sized nodes).  */
 953   tag = lto_tree_code_to_tag (code);
 954   streamer_write_record_start (ob, tag);
 955
 956   /* The text in strings and identifiers are completely emitted in
 957      the header.  */
 958   if (CODE_CONTAINS_STRUCT (code, TS_STRING))
 959     streamer_write_string_cst (ob, ob->main_stream, expr);
 960   else if (CODE_CONTAINS_STRUCT (code, TS_IDENTIFIER))
 961     write_identifier (ob, ob->main_stream, expr);
 962   else if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 963     {
 964       bitpack_d bp = bitpack_create (ob->main_stream);
 965       bp_pack_value (&bp, VECTOR_CST_LOG2_NPATTERNS (expr), 8);
 966       bp_pack_value (&bp, VECTOR_CST_NELTS_PER_PATTERN (expr), 8);
 967       streamer_write_bitpack (&bp);
 968     }
 969   else if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 970     streamer_write_hwi (ob, TREE_VEC_LENGTH (expr));
 971   else if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 972     streamer_write_uhwi (ob, BINFO_N_BASE_BINFOS (expr));
 973   else if (TREE_CODE (expr) == CALL_EXPR)
 974     streamer_write_uhwi (ob, call_expr_nargs (expr));
 975   else if (TREE_CODE (expr) == OMP_CLAUSE)
 976     streamer_write_uhwi (ob, OMP_CLAUSE_CODE (expr));
 977   else if (CODE_CONTAINS_STRUCT (code, TS_INT_CST))
 978     {
 979       gcc_checking_assert (TREE_INT_CST_NUNITS (expr));
 980       streamer_write_uhwi (ob, TREE_INT_CST_NUNITS (expr));
 981       streamer_write_uhwi (ob, TREE_INT_CST_EXT_NUNITS (expr));
 982     }
 983 }
 984
 985
 986 /* Emit the integer constant CST to output block OB.  If REF_P is true,
 987    CST's type will be emitted as a reference.  */
 988
 989 void
 990 streamer_write_integer_cst (struct output_block *ob, tree cst, bool ref_p)
 991 {
 992   int i;
 993   int len = TREE_INT_CST_NUNITS (cst);
 994   gcc_assert (!TREE_OVERFLOW (cst));
 995   streamer_write_record_start (ob, LTO_integer_cst);
 996   stream_write_tree (ob, TREE_TYPE (cst), ref_p);
 997   /* We're effectively streaming a non-sign-extended wide_int here,
 998      so there's no need to stream TREE_INT_CST_EXT_NUNITS or any
 999      array members beyond LEN.  We'll recreate the tree from the
1000      wide_int and the type.  */
1001   streamer_write_uhwi (ob, len);
1002   for (i = 0; i < len; i++)
1003     streamer_write_hwi (ob, TREE_INT_CST_ELT (cst, i));
1004 }