gcc/tree-streamer-in.c

   1 /* Routines for reading trees from a file stream.
   2
   3    Copyright (C) 2011-2013 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 "diagnostic.h"
  26 #include "tree.h"
  27 #include "stringpool.h"
  28 #include "basic-block.h"
  29 #include "tree-ssa-alias.h"
  30 #include "internal-fn.h"
  31 #include "gimple-expr.h"
  32 #include "is-a.h"
  33 #include "gimple.h"
  34 #include "tree-streamer.h"
  35 #include "data-streamer.h"
  36 #include "streamer-hooks.h"
  37 #include "lto-streamer.h"
  38
  39 /* Read a STRING_CST from the string table in DATA_IN using input
  40    block IB.  */
  41
  42 tree
  43 streamer_read_string_cst (struct data_in *data_in, struct lto_input_block *ib)
  44 {
  45   unsigned int len;
  46   const char * ptr;
  47
  48   ptr = streamer_read_indexed_string (data_in, ib, &len);
  49   if (!ptr)
  50     return NULL;
  51   return build_string (len, ptr);
  52 }
  53
  54
  55 /* Read an IDENTIFIER from the string table in DATA_IN using input
  56    block IB.  */
  57
  58 static tree
  59 input_identifier (struct data_in *data_in, struct lto_input_block *ib)
  60 {
  61   unsigned int len;
  62   const char *ptr;
  63
  64   ptr = streamer_read_indexed_string (data_in, ib, &len);
  65   if (!ptr)
  66     return NULL;
  67   return get_identifier_with_length (ptr, len);
  68 }
  69
  70
  71 /* Read a chain of tree nodes from input block IB. DATA_IN contains
  72    tables and descriptors for the file being read.  */
  73
  74 tree
  75 streamer_read_chain (struct lto_input_block *ib, struct data_in *data_in)
  76 {
  77   tree first, prev, curr;
  78
  79   /* The chain is written as NULL terminated list of trees.  */
  80   first = prev = NULL_TREE;
  81   do
  82     {
  83       curr = stream_read_tree (ib, data_in);
  84       if (prev)
  85         TREE_CHAIN (prev) = curr;
  86       else
  87         first = curr;
  88
  89       prev = curr;
  90     }
  91   while (curr);
  92
  93   return first;
  94 }
  95
  96
  97 /* Unpack all the non-pointer fields of the TS_BASE structure of
  98    expression EXPR from bitpack BP.  */
  99
 100 static void
 101 unpack_ts_base_value_fields (struct bitpack_d *bp, tree expr)
 102 {
 103   /* Note that the code for EXPR has already been unpacked to create EXPR in
 104      streamer_alloc_tree.  */
 105   if (!TYPE_P (expr))
 106     {
 107       TREE_SIDE_EFFECTS (expr) = (unsigned) bp_unpack_value (bp, 1);
 108       TREE_CONSTANT (expr) = (unsigned) bp_unpack_value (bp, 1);
 109       TREE_READONLY (expr) = (unsigned) bp_unpack_value (bp, 1);
 110
 111       /* TREE_PUBLIC is used on types to indicate that the type
 112          has a TYPE_CACHED_VALUES vector.  This is not streamed out,
 113          so we skip it here.  */
 114       TREE_PUBLIC (expr) = (unsigned) bp_unpack_value (bp, 1);
 115     }
 116   else
 117     bp_unpack_value (bp, 4);
 118   TREE_ADDRESSABLE (expr) = (unsigned) bp_unpack_value (bp, 1);
 119   TREE_THIS_VOLATILE (expr) = (unsigned) bp_unpack_value (bp, 1);
 120   if (DECL_P (expr))
 121     DECL_UNSIGNED (expr) = (unsigned) bp_unpack_value (bp, 1);
 122   else if (TYPE_P (expr))
 123     TYPE_UNSIGNED (expr) = (unsigned) bp_unpack_value (bp, 1);
 124   else
 125     bp_unpack_value (bp, 1);
 126   TREE_ASM_WRITTEN (expr) = (unsigned) bp_unpack_value (bp, 1);
 127   if (TYPE_P (expr))
 128     TYPE_ARTIFICIAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 129   else
 130     TREE_NO_WARNING (expr) = (unsigned) bp_unpack_value (bp, 1);
 131   TREE_NOTHROW (expr) = (unsigned) bp_unpack_value (bp, 1);
 132   TREE_STATIC (expr) = (unsigned) bp_unpack_value (bp, 1);
 133   if (TREE_CODE (expr) != TREE_BINFO)
 134     TREE_PRIVATE (expr) = (unsigned) bp_unpack_value (bp, 1);
 135   TREE_PROTECTED (expr) = (unsigned) bp_unpack_value (bp, 1);
 136   TREE_DEPRECATED (expr) = (unsigned) bp_unpack_value (bp, 1);
 137   if (TYPE_P (expr))
 138     {
 139       TYPE_SATURATING (expr) = (unsigned) bp_unpack_value (bp, 1);
 140       TYPE_ADDR_SPACE (expr) = (unsigned) bp_unpack_value (bp, 8);
 141     }
 142   else if (TREE_CODE (expr) == SSA_NAME)
 143     SSA_NAME_IS_DEFAULT_DEF (expr) = (unsigned) bp_unpack_value (bp, 1);
 144   else
 145     bp_unpack_value (bp, 1);
 146 }
 147
 148
 149 /* Unpack all the non-pointer fields of the TS_INT_CST structure of
 150    expression EXPR from bitpack BP.  */
 151
 152 static void
 153 unpack_ts_int_cst_value_fields (struct bitpack_d *bp, tree expr)
 154 {
 155   TREE_INT_CST_LOW (expr) = bp_unpack_var_len_unsigned (bp);
 156   TREE_INT_CST_HIGH (expr) = bp_unpack_var_len_int (bp);
 157 }
 158
 159
 160 /* Unpack all the non-pointer fields of the TS_REAL_CST structure of
 161    expression EXPR from bitpack BP.  */
 162
 163 static void
 164 unpack_ts_real_cst_value_fields (struct bitpack_d *bp, tree expr)
 165 {
 166   unsigned i;
 167   REAL_VALUE_TYPE r;
 168   REAL_VALUE_TYPE *rp;
 169
 170   r.cl = (unsigned) bp_unpack_value (bp, 2);
 171   r.decimal = (unsigned) bp_unpack_value (bp, 1);
 172   r.sign = (unsigned) bp_unpack_value (bp, 1);
 173   r.signalling = (unsigned) bp_unpack_value (bp, 1);
 174   r.canonical = (unsigned) bp_unpack_value (bp, 1);
 175   r.uexp = (unsigned) bp_unpack_value (bp, EXP_BITS);
 176   for (i = 0; i < SIGSZ; i++)
 177     r.sig[i] = (unsigned long) bp_unpack_value (bp, HOST_BITS_PER_LONG);
 178
 179   rp = ggc_alloc_real_value ();
 180   memcpy (rp, &r, sizeof (REAL_VALUE_TYPE));
 181   TREE_REAL_CST_PTR (expr) = rp;
 182 }
 183
 184
 185 /* Unpack all the non-pointer fields of the TS_FIXED_CST structure of
 186    expression EXPR from bitpack BP.  */
 187
 188 static void
 189 unpack_ts_fixed_cst_value_fields (struct bitpack_d *bp, tree expr)
 190 {
 191   FIXED_VALUE_TYPE *fp = ggc_alloc_fixed_value ();
 192   fp->mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 193   fp->data.low = bp_unpack_var_len_int (bp);
 194   fp->data.high = bp_unpack_var_len_int (bp);
 195   TREE_FIXED_CST_PTR (expr) = fp;
 196 }
 197
 198 /* Unpack all the non-pointer fields of the TS_DECL_COMMON structure
 199    of expression EXPR from bitpack BP.  */
 200
 201 static void
 202 unpack_ts_decl_common_value_fields (struct bitpack_d *bp, tree expr)
 203 {
 204   DECL_MODE (expr) = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 205   DECL_NONLOCAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 206   DECL_VIRTUAL_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 207   DECL_IGNORED_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 208   DECL_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
 209   DECL_ARTIFICIAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 210   DECL_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
 211   DECL_PRESERVE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 212   DECL_EXTERNAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 213   DECL_GIMPLE_REG_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 214   DECL_ALIGN (expr) = (unsigned) bp_unpack_var_len_unsigned (bp);
 215
 216   if (TREE_CODE (expr) == LABEL_DECL)
 217     {
 218       EH_LANDING_PAD_NR (expr) = (int) bp_unpack_var_len_unsigned (bp);
 219
 220       /* Always assume an initial value of -1 for LABEL_DECL_UID to
 221          force gimple_set_bb to recreate label_to_block_map.  */
 222       LABEL_DECL_UID (expr) = -1;
 223     }
 224
 225   if (TREE_CODE (expr) == FIELD_DECL)
 226     {
 227       DECL_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
 228       DECL_NONADDRESSABLE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 229       expr->decl_common.off_align = bp_unpack_value (bp, 8);
 230     }
 231
 232   if (TREE_CODE (expr) == VAR_DECL)
 233     {
 234       DECL_HAS_DEBUG_EXPR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 235       DECL_NONLOCAL_FRAME (expr) = (unsigned) bp_unpack_value (bp, 1);
 236     }
 237
 238   if (TREE_CODE (expr) == RESULT_DECL
 239       || TREE_CODE (expr) == PARM_DECL
 240       || TREE_CODE (expr) == VAR_DECL)
 241     {
 242       DECL_BY_REFERENCE (expr) = (unsigned) bp_unpack_value (bp, 1);
 243       if (TREE_CODE (expr) == VAR_DECL
 244           || TREE_CODE (expr) == PARM_DECL)
 245         DECL_HAS_VALUE_EXPR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 246     }
 247 }
 248
 249
 250 /* Unpack all the non-pointer fields of the TS_DECL_WRTL structure
 251    of expression EXPR from bitpack BP.  */
 252
 253 static void
 254 unpack_ts_decl_wrtl_value_fields (struct bitpack_d *bp, tree expr)
 255 {
 256   DECL_REGISTER (expr) = (unsigned) bp_unpack_value (bp, 1);
 257 }
 258
 259
 260 /* Unpack all the non-pointer fields of the TS_DECL_WITH_VIS structure
 261    of expression EXPR from bitpack BP.  */
 262
 263 static void
 264 unpack_ts_decl_with_vis_value_fields (struct bitpack_d *bp, tree expr)
 265 {
 266   DECL_COMMON (expr) = (unsigned) bp_unpack_value (bp, 1);
 267   DECL_DLLIMPORT_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 268   DECL_WEAK (expr) = (unsigned) bp_unpack_value (bp, 1);
 269   DECL_SEEN_IN_BIND_EXPR_P (expr) = (unsigned) bp_unpack_value (bp,  1);
 270   DECL_COMDAT (expr) = (unsigned) bp_unpack_value (bp,  1);
 271   DECL_VISIBILITY (expr) = (enum symbol_visibility) bp_unpack_value (bp,  2);
 272   DECL_VISIBILITY_SPECIFIED (expr) = (unsigned) bp_unpack_value (bp,  1);
 273
 274   if (TREE_CODE (expr) == VAR_DECL)
 275     {
 276       DECL_HARD_REGISTER (expr) = (unsigned) bp_unpack_value (bp, 1);
 277       DECL_IN_CONSTANT_POOL (expr) = (unsigned) bp_unpack_value (bp, 1);
 278       DECL_TLS_MODEL (expr) = (enum tls_model) bp_unpack_value (bp,  3);
 279     }
 280
 281   if (TREE_CODE (expr) == FUNCTION_DECL)
 282     {
 283       DECL_FINAL_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 284       DECL_CXX_CONSTRUCTOR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 285       DECL_CXX_DESTRUCTOR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 286     }
 287   if (VAR_OR_FUNCTION_DECL_P (expr))
 288     {
 289       priority_type p;
 290       p = (priority_type) bp_unpack_var_len_unsigned (bp);
 291       SET_DECL_INIT_PRIORITY (expr, p);
 292     }
 293 }
 294
 295
 296 /* Unpack all the non-pointer fields of the TS_FUNCTION_DECL structure
 297    of expression EXPR from bitpack BP.  */
 298
 299 static void
 300 unpack_ts_function_decl_value_fields (struct bitpack_d *bp, tree expr)
 301 {
 302   DECL_BUILT_IN_CLASS (expr) = bp_unpack_enum (bp, built_in_class,
 303                                                BUILT_IN_LAST);
 304   DECL_STATIC_CONSTRUCTOR (expr) = (unsigned) bp_unpack_value (bp, 1);
 305   DECL_STATIC_DESTRUCTOR (expr) = (unsigned) bp_unpack_value (bp, 1);
 306   DECL_UNINLINABLE (expr) = (unsigned) bp_unpack_value (bp, 1);
 307   DECL_POSSIBLY_INLINED (expr) = (unsigned) bp_unpack_value (bp, 1);
 308   DECL_IS_NOVOPS (expr) = (unsigned) bp_unpack_value (bp, 1);
 309   DECL_IS_RETURNS_TWICE (expr) = (unsigned) bp_unpack_value (bp, 1);
 310   DECL_IS_MALLOC (expr) = (unsigned) bp_unpack_value (bp, 1);
 311   DECL_IS_OPERATOR_NEW (expr) = (unsigned) bp_unpack_value (bp, 1);
 312   DECL_DECLARED_INLINE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 313   DECL_STATIC_CHAIN (expr) = (unsigned) bp_unpack_value (bp, 1);
 314   DECL_NO_INLINE_WARNING_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 315   DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (expr)
 316                         = (unsigned) bp_unpack_value (bp, 1);
 317   DECL_NO_LIMIT_STACK (expr) = (unsigned) bp_unpack_value (bp, 1);
 318   DECL_DISREGARD_INLINE_LIMITS (expr) = (unsigned) bp_unpack_value (bp, 1);
 319   DECL_PURE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 320   DECL_LOOPING_CONST_OR_PURE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 321   if (DECL_BUILT_IN_CLASS (expr) != NOT_BUILT_IN)
 322     {
 323       DECL_FUNCTION_CODE (expr) = (enum built_in_function) bp_unpack_value (bp,
 324                                                                             11);
 325       if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_NORMAL
 326           && DECL_FUNCTION_CODE (expr) >= END_BUILTINS)
 327         fatal_error ("machine independent builtin code out of range");
 328       else if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_MD)
 329         {
 330           tree result = targetm.builtin_decl (DECL_FUNCTION_CODE (expr), true);
 331           if (!result || result == error_mark_node)
 332             fatal_error ("target specific builtin not available");
 333         }
 334     }
 335   if (DECL_STATIC_DESTRUCTOR (expr))
 336     {
 337       priority_type p;
 338       p = (priority_type) bp_unpack_var_len_unsigned (bp);
 339       SET_DECL_FINI_PRIORITY (expr, p);
 340     }
 341 }
 342
 343
 344 /* Unpack all the non-pointer fields of the TS_TYPE_COMMON structure
 345    of expression EXPR from bitpack BP.  */
 346
 347 static void
 348 unpack_ts_type_common_value_fields (struct bitpack_d *bp, tree expr)
 349 {
 350   enum machine_mode mode;
 351
 352   mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 353   SET_TYPE_MODE (expr, mode);
 354   TYPE_STRING_FLAG (expr) = (unsigned) bp_unpack_value (bp, 1);
 355   TYPE_NO_FORCE_BLK (expr) = (unsigned) bp_unpack_value (bp, 1);
 356   TYPE_NEEDS_CONSTRUCTING (expr) = (unsigned) bp_unpack_value (bp, 1);
 357   if (RECORD_OR_UNION_TYPE_P (expr))
 358     {
 359       TYPE_TRANSPARENT_AGGR (expr) = (unsigned) bp_unpack_value (bp, 1);
 360       TYPE_FINAL_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 361     }
 362   else if (TREE_CODE (expr) == ARRAY_TYPE)
 363     TYPE_NONALIASED_COMPONENT (expr) = (unsigned) bp_unpack_value (bp, 1);
 364   TYPE_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
 365   TYPE_RESTRICT (expr) = (unsigned) bp_unpack_value (bp, 1);
 366   TYPE_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
 367   TYPE_READONLY (expr) = (unsigned) bp_unpack_value (bp, 1);
 368   TYPE_PRECISION (expr) = bp_unpack_var_len_unsigned (bp);
 369   TYPE_ALIGN (expr) = bp_unpack_var_len_unsigned (bp);
 370   TYPE_ALIAS_SET (expr) = bp_unpack_var_len_int (bp);
 371 }
 372
 373
 374 /* Unpack all the non-pointer fields of the TS_BLOCK structure
 375    of expression EXPR from bitpack BP.  */
 376
 377 static void
 378 unpack_ts_block_value_fields (struct data_in *data_in,
 379                               struct bitpack_d *bp, tree expr)
 380 {
 381   BLOCK_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
 382   /* BLOCK_NUMBER is recomputed.  */
 383   BLOCK_SOURCE_LOCATION (expr) = stream_input_location (bp, data_in);
 384 }
 385
 386 /* Unpack all the non-pointer fields of the TS_TRANSLATION_UNIT_DECL
 387    structure of expression EXPR from bitpack BP.  */
 388
 389 static void
 390 unpack_ts_translation_unit_decl_value_fields (struct data_in *data_in,
 391                                               struct bitpack_d *bp, tree expr)
 392 {
 393   TRANSLATION_UNIT_LANGUAGE (expr) = xstrdup (bp_unpack_string (data_in, bp));
 394   vec_safe_push (all_translation_units, expr);
 395 }
 396
 397 /* Unpack a TS_TARGET_OPTION tree from BP into EXPR.  */
 398
 399 static void
 400 unpack_ts_target_option (struct bitpack_d *bp, tree expr)
 401 {
 402   unsigned i, len;
 403   struct cl_target_option *t = TREE_TARGET_OPTION (expr);
 404
 405   len = sizeof (struct cl_target_option);
 406   for (i = 0; i < len; i++)
 407     ((unsigned char *)t)[i] = bp_unpack_value (bp, 8);
 408   if (bp_unpack_value (bp, 32) != 0x12345678)
 409     fatal_error ("cl_target_option size mismatch in LTO reader and writer");
 410 }
 411
 412 /* Unpack a TS_OPTIMIZATION tree from BP into EXPR.  */
 413
 414 static void
 415 unpack_ts_optimization (struct bitpack_d *bp, tree expr)
 416 {
 417   unsigned i, len;
 418   struct cl_optimization *t = TREE_OPTIMIZATION (expr);
 419
 420   len = sizeof (struct cl_optimization);
 421   for (i = 0; i < len; i++)
 422     ((unsigned char *)t)[i] = bp_unpack_value (bp, 8);
 423   if (bp_unpack_value (bp, 32) != 0x12345678)
 424     fatal_error ("cl_optimization size mismatch in LTO reader and writer");
 425 }
 426
 427
 428 /* Unpack all the non-pointer fields in EXPR into a bit pack.  */
 429
 430 static void
 431 unpack_value_fields (struct data_in *data_in, struct bitpack_d *bp, tree expr)
 432 {
 433   enum tree_code code;
 434
 435   code = TREE_CODE (expr);
 436
 437   /* Note that all these functions are highly sensitive to changes in
 438      the types and sizes of each of the fields being packed.  */
 439   unpack_ts_base_value_fields (bp, expr);
 440
 441   if (CODE_CONTAINS_STRUCT (code, TS_INT_CST))
 442     unpack_ts_int_cst_value_fields (bp, expr);
 443
 444   if (CODE_CONTAINS_STRUCT (code, TS_REAL_CST))
 445     unpack_ts_real_cst_value_fields (bp, expr);
 446
 447   if (CODE_CONTAINS_STRUCT (code, TS_FIXED_CST))
 448     unpack_ts_fixed_cst_value_fields (bp, expr);
 449
 450   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 451     DECL_SOURCE_LOCATION (expr) = stream_input_location (bp, data_in);
 452
 453   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 454     unpack_ts_decl_common_value_fields (bp, expr);
 455
 456   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WRTL))
 457     unpack_ts_decl_wrtl_value_fields (bp, expr);
 458
 459   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 460     unpack_ts_decl_with_vis_value_fields (bp, expr);
 461
 462   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 463     unpack_ts_function_decl_value_fields (bp, expr);
 464
 465   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 466     unpack_ts_type_common_value_fields (bp, expr);
 467
 468   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 469     SET_EXPR_LOCATION (expr, stream_input_location (bp, data_in));
 470
 471   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 472     unpack_ts_block_value_fields (data_in, bp, expr);
 473
 474   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
 475     unpack_ts_translation_unit_decl_value_fields (data_in, bp, expr);
 476
 477   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION))
 478     unpack_ts_target_option (bp, expr);
 479
 480   if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION))
 481     unpack_ts_optimization (bp, expr);
 482
 483   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 484     {
 485       unsigned HOST_WIDE_INT length = bp_unpack_var_len_unsigned (bp);
 486       if (length > 0)
 487         vec_safe_grow (BINFO_BASE_ACCESSES (expr), length);
 488     }
 489
 490   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
 491     {
 492       unsigned HOST_WIDE_INT length = bp_unpack_var_len_unsigned (bp);
 493       if (length > 0)
 494         vec_safe_grow (CONSTRUCTOR_ELTS (expr), length);
 495     }
 496 }
 497
 498
 499 /* Read all the language-independent bitfield values for EXPR from IB.
 500    Return the partially unpacked bitpack so the caller can unpack any other
 501    bitfield values that the writer may have written.  */
 502
 503 struct bitpack_d
 504 streamer_read_tree_bitfields (struct lto_input_block *ib,
 505                               struct data_in *data_in, tree expr)
 506 {
 507   enum tree_code code;
 508   struct bitpack_d bp;
 509
 510   /* Read the bitpack of non-pointer values from IB.  */
 511   bp = streamer_read_bitpack (ib);
 512
 513   /* The first word in BP contains the code of the tree that we
 514      are about to read.  */
 515   code = (enum tree_code) bp_unpack_value (&bp, 16);
 516   lto_tag_check (lto_tree_code_to_tag (code),
 517                  lto_tree_code_to_tag (TREE_CODE (expr)));
 518
 519   /* Unpack all the value fields from BP.  */
 520   unpack_value_fields (data_in, &bp, expr);
 521
 522   return bp;
 523 }
 524
 525
 526 /* Materialize a new tree from input block IB using descriptors in
 527    DATA_IN.  The code for the new tree should match TAG.  Store in
 528    *IX_P the index into the reader cache where the new tree is stored.  */
 529
 530 tree
 531 streamer_alloc_tree (struct lto_input_block *ib, struct data_in *data_in,
 532                      enum LTO_tags tag)
 533 {
 534   enum tree_code code;
 535   tree result;
 536 #ifdef LTO_STREAMER_DEBUG
 537   HOST_WIDEST_INT orig_address_in_writer;
 538 #endif
 539
 540   result = NULL_TREE;
 541
 542 #ifdef LTO_STREAMER_DEBUG
 543   /* Read the word representing the memory address for the tree
 544      as it was written by the writer.  This is useful when
 545      debugging differences between the writer and reader.  */
 546   orig_address_in_writer = streamer_read_hwi (ib);
 547   gcc_assert ((intptr_t) orig_address_in_writer == orig_address_in_writer);
 548 #endif
 549
 550   code = lto_tag_to_tree_code (tag);
 551
 552   /* We should never see an SSA_NAME tree.  Only the version numbers of
 553      SSA names are ever written out.  See input_ssa_names.  */
 554   gcc_assert (code != SSA_NAME);
 555
 556   /* Instantiate a new tree using the header data.  */
 557   if (CODE_CONTAINS_STRUCT (code, TS_STRING))
 558     result = streamer_read_string_cst (data_in, ib);
 559   else if (CODE_CONTAINS_STRUCT (code, TS_IDENTIFIER))
 560     result = input_identifier (data_in, ib);
 561   else if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 562     {
 563       HOST_WIDE_INT len = streamer_read_hwi (ib);
 564       result = make_tree_vec (len);
 565     }
 566   else if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 567     {
 568       HOST_WIDE_INT len = streamer_read_hwi (ib);
 569       result = make_vector (len);
 570     }
 571   else if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 572     {
 573       unsigned HOST_WIDE_INT len = streamer_read_uhwi (ib);
 574       result = make_tree_binfo (len);
 575     }
 576   else if (code == CALL_EXPR)
 577     {
 578       unsigned HOST_WIDE_INT nargs = streamer_read_uhwi (ib);
 579       return build_vl_exp (CALL_EXPR, nargs + 3);
 580     }
 581   else
 582     {
 583       /* For all other nodes, materialize the tree with a raw
 584          make_node call.  */
 585       result = make_node (code);
 586     }
 587
 588 #ifdef LTO_STREAMER_DEBUG
 589   /* Store the original address of the tree as seen by the writer
 590      in RESULT's aux field.  This is useful when debugging streaming
 591      problems.  This way, a debugging session can be started on
 592      both writer and reader with a breakpoint using this address
 593      value in both.  */
 594   lto_orig_address_map (result, (intptr_t) orig_address_in_writer);
 595 #endif
 596
 597   return result;
 598 }
 599
 600
 601 /* Read all pointer fields in the TS_COMMON structure of EXPR from input
 602    block IB.  DATA_IN contains tables and descriptors for the
 603    file being read.  */
 604
 605
 606 static void
 607 lto_input_ts_common_tree_pointers (struct lto_input_block *ib,
 608                                    struct data_in *data_in, tree expr)
 609 {
 610   if (TREE_CODE (expr) != IDENTIFIER_NODE)
 611     TREE_TYPE (expr) = stream_read_tree (ib, data_in);
 612 }
 613
 614
 615 /* Read all pointer fields in the TS_VECTOR structure of EXPR from input
 616    block IB.  DATA_IN contains tables and descriptors for the
 617    file being read.  */
 618
 619 static void
 620 lto_input_ts_vector_tree_pointers (struct lto_input_block *ib,
 621                                    struct data_in *data_in, tree expr)
 622 {
 623   unsigned i;
 624   for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
 625     VECTOR_CST_ELT (expr, i) = stream_read_tree (ib, data_in);
 626 }
 627
 628
 629 /* Read all pointer fields in the TS_COMPLEX structure of EXPR from input
 630    block IB.  DATA_IN contains tables and descriptors for the
 631    file being read.  */
 632
 633 static void
 634 lto_input_ts_complex_tree_pointers (struct lto_input_block *ib,
 635                                     struct data_in *data_in, tree expr)
 636 {
 637   TREE_REALPART (expr) = stream_read_tree (ib, data_in);
 638   TREE_IMAGPART (expr) = stream_read_tree (ib, data_in);
 639 }
 640
 641
 642 /* Read all pointer fields in the TS_DECL_MINIMAL structure of EXPR
 643    from input block IB.  DATA_IN contains tables and descriptors for the
 644    file being read.  */
 645
 646 static void
 647 lto_input_ts_decl_minimal_tree_pointers (struct lto_input_block *ib,
 648                                          struct data_in *data_in, tree expr)
 649 {
 650   DECL_NAME (expr) = stream_read_tree (ib, data_in);
 651   DECL_CONTEXT (expr) = stream_read_tree (ib, data_in);
 652 }
 653
 654
 655 /* Read all pointer fields in the TS_DECL_COMMON structure of EXPR from
 656    input block IB.  DATA_IN contains tables and descriptors for the
 657    file being read.  */
 658
 659 static void
 660 lto_input_ts_decl_common_tree_pointers (struct lto_input_block *ib,
 661                                         struct data_in *data_in, tree expr)
 662 {
 663   DECL_SIZE (expr) = stream_read_tree (ib, data_in);
 664   DECL_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 665   DECL_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 666
 667   /* Do not stream DECL_ABSTRACT_ORIGIN.  We cannot handle debug information
 668      for early inlining so drop it on the floor instead of ICEing in
 669      dwarf2out.c.  */
 670
 671   if ((TREE_CODE (expr) == VAR_DECL
 672        || TREE_CODE (expr) == PARM_DECL)
 673       && DECL_HAS_VALUE_EXPR_P (expr))
 674     SET_DECL_VALUE_EXPR (expr, stream_read_tree (ib, data_in));
 675
 676   if (TREE_CODE (expr) == VAR_DECL)
 677     {
 678       tree dexpr = stream_read_tree (ib, data_in);
 679       if (dexpr)
 680         SET_DECL_DEBUG_EXPR (expr, dexpr);
 681     }
 682 }
 683
 684
 685 /* Read all pointer fields in the TS_DECL_NON_COMMON structure of
 686    EXPR from input block IB.  DATA_IN contains tables and descriptors for the
 687    file being read.  */
 688
 689 static void
 690 lto_input_ts_decl_non_common_tree_pointers (struct lto_input_block *ib,
 691                                             struct data_in *data_in, tree expr)
 692 {
 693   if (TREE_CODE (expr) == TYPE_DECL)
 694     DECL_ORIGINAL_TYPE (expr) = stream_read_tree (ib, data_in);
 695   DECL_VINDEX (expr) = stream_read_tree (ib, data_in);
 696 }
 697
 698
 699 /* Read all pointer fields in the TS_DECL_WITH_VIS structure of EXPR
 700    from input block IB.  DATA_IN contains tables and descriptors for the
 701    file being read.  */
 702
 703 static void
 704 lto_input_ts_decl_with_vis_tree_pointers (struct lto_input_block *ib,
 705                                           struct data_in *data_in, tree expr)
 706 {
 707   tree id;
 708
 709   id = stream_read_tree (ib, data_in);
 710   if (id)
 711     {
 712       gcc_assert (TREE_CODE (id) == IDENTIFIER_NODE);
 713       SET_DECL_ASSEMBLER_NAME (expr, id);
 714     }
 715
 716   DECL_SECTION_NAME (expr) = stream_read_tree (ib, data_in);
 717   DECL_COMDAT_GROUP (expr) = stream_read_tree (ib, data_in);
 718 }
 719
 720
 721 /* Read all pointer fields in the TS_FIELD_DECL structure of EXPR from
 722    input block IB.  DATA_IN contains tables and descriptors for the
 723    file being read.  */
 724
 725 static void
 726 lto_input_ts_field_decl_tree_pointers (struct lto_input_block *ib,
 727                                        struct data_in *data_in, tree expr)
 728 {
 729   DECL_FIELD_OFFSET (expr) = stream_read_tree (ib, data_in);
 730   DECL_BIT_FIELD_TYPE (expr) = stream_read_tree (ib, data_in);
 731   DECL_BIT_FIELD_REPRESENTATIVE (expr) = stream_read_tree (ib, data_in);
 732   DECL_FIELD_BIT_OFFSET (expr) = stream_read_tree (ib, data_in);
 733   DECL_FCONTEXT (expr) = stream_read_tree (ib, data_in);
 734 }
 735
 736
 737 /* Read all pointer fields in the TS_FUNCTION_DECL structure of EXPR
 738    from input block IB.  DATA_IN contains tables and descriptors for the
 739    file being read.  */
 740
 741 static void
 742 lto_input_ts_function_decl_tree_pointers (struct lto_input_block *ib,
 743                                           struct data_in *data_in, tree expr)
 744 {
 745   /* DECL_STRUCT_FUNCTION is handled by lto_input_function.  FIXME lto,
 746      maybe it should be handled here?  */
 747   DECL_FUNCTION_PERSONALITY (expr) = stream_read_tree (ib, data_in);
 748   DECL_FUNCTION_SPECIFIC_TARGET (expr) = stream_read_tree (ib, data_in);
 749   DECL_FUNCTION_SPECIFIC_OPTIMIZATION (expr) = stream_read_tree (ib, data_in);
 750
 751   /* If the file contains a function with an EH personality set,
 752      then it was compiled with -fexceptions.  In that case, initialize
 753      the backend EH machinery.  */
 754   if (DECL_FUNCTION_PERSONALITY (expr))
 755     lto_init_eh ();
 756 }
 757
 758
 759 /* Read all pointer fields in the TS_TYPE_COMMON structure of EXPR from
 760    input block IB.  DATA_IN contains tables and descriptors for the file
 761    being read.  */
 762
 763 static void
 764 lto_input_ts_type_common_tree_pointers (struct lto_input_block *ib,
 765                                         struct data_in *data_in, tree expr)
 766 {
 767   TYPE_SIZE (expr) = stream_read_tree (ib, data_in);
 768   TYPE_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 769   TYPE_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 770   TYPE_NAME (expr) = stream_read_tree (ib, data_in);
 771   /* Do not stream TYPE_POINTER_TO or TYPE_REFERENCE_TO.  They will be
 772      reconstructed during fixup.  */
 773   /* Do not stream TYPE_NEXT_VARIANT, we reconstruct the variant lists
 774      during fixup.  */
 775   TYPE_MAIN_VARIANT (expr) = stream_read_tree (ib, data_in);
 776   TYPE_CONTEXT (expr) = stream_read_tree (ib, data_in);
 777   /* TYPE_CANONICAL gets re-computed during type merging.  */
 778   TYPE_CANONICAL (expr) = NULL_TREE;
 779   TYPE_STUB_DECL (expr) = stream_read_tree (ib, data_in);
 780 }
 781
 782 /* Read all pointer fields in the TS_TYPE_NON_COMMON structure of EXPR
 783    from input block IB.  DATA_IN contains tables and descriptors for the
 784    file being read.  */
 785
 786 static void
 787 lto_input_ts_type_non_common_tree_pointers (struct lto_input_block *ib,
 788                                             struct data_in *data_in,
 789                                             tree expr)
 790 {
 791   if (TREE_CODE (expr) == ENUMERAL_TYPE)
 792     TYPE_VALUES (expr) = stream_read_tree (ib, data_in);
 793   else if (TREE_CODE (expr) == ARRAY_TYPE)
 794     TYPE_DOMAIN (expr) = stream_read_tree (ib, data_in);
 795   else if (RECORD_OR_UNION_TYPE_P (expr))
 796     TYPE_FIELDS (expr) = streamer_read_chain (ib, data_in);
 797   else if (TREE_CODE (expr) == FUNCTION_TYPE
 798            || TREE_CODE (expr) == METHOD_TYPE)
 799     TYPE_ARG_TYPES (expr) = stream_read_tree (ib, data_in);
 800
 801   if (!POINTER_TYPE_P (expr))
 802     TYPE_MINVAL (expr) = stream_read_tree (ib, data_in);
 803   TYPE_MAXVAL (expr) = stream_read_tree (ib, data_in);
 804   if (RECORD_OR_UNION_TYPE_P (expr))
 805     TYPE_BINFO (expr) = stream_read_tree (ib, data_in);
 806 }
 807
 808
 809 /* Read all pointer fields in the TS_LIST structure of EXPR from input
 810    block IB.  DATA_IN contains tables and descriptors for the
 811    file being read.  */
 812
 813 static void
 814 lto_input_ts_list_tree_pointers (struct lto_input_block *ib,
 815                                  struct data_in *data_in, tree expr)
 816 {
 817   TREE_PURPOSE (expr) = stream_read_tree (ib, data_in);
 818   TREE_VALUE (expr) = stream_read_tree (ib, data_in);
 819   TREE_CHAIN (expr) = stream_read_tree (ib, data_in);
 820 }
 821
 822
 823 /* Read all pointer fields in the TS_VEC structure of EXPR from input
 824    block IB.  DATA_IN contains tables and descriptors for the
 825    file being read.  */
 826
 827 static void
 828 lto_input_ts_vec_tree_pointers (struct lto_input_block *ib,
 829                                 struct data_in *data_in, tree expr)
 830 {
 831   int i;
 832
 833   /* Note that TREE_VEC_LENGTH was read by streamer_alloc_tree to
 834      instantiate EXPR.  */
 835   for (i = 0; i < TREE_VEC_LENGTH (expr); i++)
 836     TREE_VEC_ELT (expr, i) = stream_read_tree (ib, data_in);
 837 }
 838
 839
 840 /* Read all pointer fields in the TS_EXP structure of EXPR from input
 841    block IB.  DATA_IN contains tables and descriptors for the
 842    file being read.  */
 843
 844
 845 static void
 846 lto_input_ts_exp_tree_pointers (struct lto_input_block *ib,
 847                                 struct data_in *data_in, tree expr)
 848 {
 849   int i;
 850
 851   for (i = 0; i < TREE_OPERAND_LENGTH (expr); i++)
 852     TREE_OPERAND (expr, i) = stream_read_tree (ib, data_in);
 853
 854   TREE_SET_BLOCK (expr, stream_read_tree (ib, data_in));
 855 }
 856
 857
 858 /* Read all pointer fields in the TS_BLOCK structure of EXPR from input
 859    block IB.  DATA_IN contains tables and descriptors for the
 860    file being read.  */
 861
 862 static void
 863 lto_input_ts_block_tree_pointers (struct lto_input_block *ib,
 864                                   struct data_in *data_in, tree expr)
 865 {
 866   BLOCK_VARS (expr) = streamer_read_chain (ib, data_in);
 867
 868   BLOCK_SUPERCONTEXT (expr) = stream_read_tree (ib, data_in);
 869
 870   /* Stream BLOCK_ABSTRACT_ORIGIN and BLOCK_SOURCE_LOCATION for
 871      the limited cases we can handle - those that represent inlined
 872      function scopes.  For the rest them on the floor instead of ICEing in
 873      dwarf2out.c.  */
 874   BLOCK_ABSTRACT_ORIGIN (expr) = stream_read_tree (ib, data_in);
 875   /* Do not stream BLOCK_NONLOCALIZED_VARS.  We cannot handle debug information
 876      for early inlined BLOCKs so drop it on the floor instead of ICEing in
 877      dwarf2out.c.  */
 878
 879   /* BLOCK_FRAGMENT_ORIGIN and BLOCK_FRAGMENT_CHAIN is not live at LTO
 880      streaming time.  */
 881
 882   /* We re-compute BLOCK_SUBBLOCKS of our parent here instead
 883      of streaming it.  For non-BLOCK BLOCK_SUPERCONTEXTs we still
 884      stream the child relationship explicitly.  */
 885   if (BLOCK_SUPERCONTEXT (expr)
 886       && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == BLOCK)
 887     {
 888       BLOCK_CHAIN (expr) = BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr));
 889       BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr)) = expr;
 890     }
 891
 892   /* The global block is rooted at the TU decl.  Hook it here to
 893      avoid the need to stream in this block during WPA time.  */
 894   else if (BLOCK_SUPERCONTEXT (expr)
 895            && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == TRANSLATION_UNIT_DECL)
 896     DECL_INITIAL (BLOCK_SUPERCONTEXT (expr)) = expr;
 897
 898   /* The function-level block is connected at the time we read in
 899      function bodies for the same reason.  */
 900 }
 901
 902
 903 /* Read all pointer fields in the TS_BINFO structure of EXPR from input
 904    block IB.  DATA_IN contains tables and descriptors for the
 905    file being read.  */
 906
 907 static void
 908 lto_input_ts_binfo_tree_pointers (struct lto_input_block *ib,
 909                                   struct data_in *data_in, tree expr)
 910 {
 911   unsigned i;
 912   tree t;
 913
 914   /* Note that the number of slots in EXPR was read in
 915      streamer_alloc_tree when instantiating EXPR.  However, the
 916      vector is empty so we cannot rely on vec::length to know how many
 917      elements to read.  So, this list is emitted as a 0-terminated
 918      list on the writer side.  */
 919   do
 920     {
 921       t = stream_read_tree (ib, data_in);
 922       if (t)
 923         BINFO_BASE_BINFOS (expr)->quick_push (t);
 924     }
 925   while (t);
 926
 927   BINFO_OFFSET (expr) = stream_read_tree (ib, data_in);
 928   BINFO_VTABLE (expr) = stream_read_tree (ib, data_in);
 929   BINFO_VPTR_FIELD (expr) = stream_read_tree (ib, data_in);
 930
 931   /* The vector of BINFO_BASE_ACCESSES is pre-allocated during
 932      unpacking the bitfield section.  */
 933   for (i = 0; i < vec_safe_length (BINFO_BASE_ACCESSES (expr)); i++)
 934     {
 935       tree a = stream_read_tree (ib, data_in);
 936       (*BINFO_BASE_ACCESSES (expr))[i] = a;
 937     }
 938   /* Do not walk BINFO_INHERITANCE_CHAIN, BINFO_SUBVTT_INDEX
 939      and BINFO_VPTR_INDEX; these are used by C++ FE only.  */
 940 }
 941
 942
 943 /* Read all pointer fields in the TS_CONSTRUCTOR structure of EXPR from
 944    input block IB.  DATA_IN contains tables and descriptors for the
 945    file being read.  */
 946
 947 static void
 948 lto_input_ts_constructor_tree_pointers (struct lto_input_block *ib,
 949                                         struct data_in *data_in, tree expr)
 950 {
 951   unsigned i;
 952
 953   for (i = 0; i < CONSTRUCTOR_NELTS (expr); i++)
 954     {
 955       constructor_elt e;
 956       e.index = stream_read_tree (ib, data_in);
 957       e.value = stream_read_tree (ib, data_in);
 958       (*CONSTRUCTOR_ELTS (expr))[i] = e;
 959     }
 960 }
 961
 962
 963 /* Read all pointer fields in EXPR from input block IB.  DATA_IN
 964    contains tables and descriptors for the file being read.  */
 965
 966 void
 967 streamer_read_tree_body (struct lto_input_block *ib, struct data_in *data_in,
 968                          tree expr)
 969 {
 970   enum tree_code code;
 971
 972   code = TREE_CODE (expr);
 973
 974   if (CODE_CONTAINS_STRUCT (code, TS_TYPED))
 975     lto_input_ts_common_tree_pointers (ib, data_in, expr);
 976
 977   if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 978     lto_input_ts_vector_tree_pointers (ib, data_in, expr);
 979
 980   if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX))
 981     lto_input_ts_complex_tree_pointers (ib, data_in, expr);
 982
 983   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 984     lto_input_ts_decl_minimal_tree_pointers (ib, data_in, expr);
 985
 986   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 987     lto_input_ts_decl_common_tree_pointers (ib, data_in, expr);
 988
 989   if (CODE_CONTAINS_STRUCT (code, TS_DECL_NON_COMMON))
 990     lto_input_ts_decl_non_common_tree_pointers (ib, data_in, expr);
 991
 992   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 993     lto_input_ts_decl_with_vis_tree_pointers (ib, data_in, expr);
 994
 995   if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL))
 996     lto_input_ts_field_decl_tree_pointers (ib, data_in, expr);
 997
 998   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 999     lto_input_ts_function_decl_tree_pointers (ib, data_in, expr);
1000
1001   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
1002     lto_input_ts_type_common_tree_pointers (ib, data_in, expr);
1003
1004   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON))
1005     lto_input_ts_type_non_common_tree_pointers (ib, data_in, expr);
1006
1007   if (CODE_CONTAINS_STRUCT (code, TS_LIST))
1008     lto_input_ts_list_tree_pointers (ib, data_in, expr);
1009
1010   if (CODE_CONTAINS_STRUCT (code, TS_VEC))
1011     lto_input_ts_vec_tree_pointers (ib, data_in, expr);
1012
1013   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
1014     lto_input_ts_exp_tree_pointers (ib, data_in, expr);
1015
1016   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
1017     lto_input_ts_block_tree_pointers (ib, data_in, expr);
1018
1019   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
1020     lto_input_ts_binfo_tree_pointers (ib, data_in, expr);
1021
1022   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
1023     lto_input_ts_constructor_tree_pointers (ib, data_in, expr);
1024 }
1025
1026
1027 /* Read an index IX from input block IB and return the tree node at
1028    DATA_IN->FILE_DATA->GLOBALS_INDEX[IX].  */
1029
1030 tree
1031 streamer_get_pickled_tree (struct lto_input_block *ib, struct data_in *data_in)
1032 {
1033   unsigned HOST_WIDE_INT ix;
1034   tree result;
1035   enum LTO_tags expected_tag;
1036
1037   ix = streamer_read_uhwi (ib);
1038   expected_tag = streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
1039
1040   result = streamer_tree_cache_get_tree (data_in->reader_cache, ix);
1041   gcc_assert (result
1042               && TREE_CODE (result) == lto_tag_to_tree_code (expected_tag));
1043
1044   return result;
1045 }
1046
1047
1048 /* Read a code and class from input block IB and return the
1049    corresponding builtin.  DATA_IN is as in stream_read_tree.  */
1050
1051 tree
1052 streamer_get_builtin_tree (struct lto_input_block *ib, struct data_in *data_in)
1053 {
1054   enum built_in_class fclass;
1055   enum built_in_function fcode;
1056   const char *asmname;
1057   tree result;
1058
1059   fclass = streamer_read_enum (ib, built_in_class, BUILT_IN_LAST);
1060   gcc_assert (fclass == BUILT_IN_NORMAL || fclass == BUILT_IN_MD);
1061
1062   fcode = (enum built_in_function) streamer_read_uhwi (ib);
1063
1064   if (fclass == BUILT_IN_NORMAL)
1065     {
1066       if (fcode >= END_BUILTINS)
1067         fatal_error ("machine independent builtin code out of range");
1068       result = builtin_decl_explicit (fcode);
1069       gcc_assert (result);
1070     }
1071   else if (fclass == BUILT_IN_MD)
1072     {
1073       result = targetm.builtin_decl (fcode, true);
1074       if (!result || result == error_mark_node)
1075         fatal_error ("target specific builtin not available");
1076     }
1077   else
1078     gcc_unreachable ();
1079
1080   asmname = streamer_read_string (data_in, ib);
1081   if (asmname)
1082     set_builtin_user_assembler_name (result, asmname);
1083
1084   streamer_tree_cache_append (data_in->reader_cache, result, 0);
1085
1086   return result;
1087 }