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