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