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-flow.h"
  28 #include "tree-streamer.h"
  29 #include "data-streamer.h"
  30 #include "streamer-hooks.h"
  31 #include "lto-streamer.h"
  32
  33 /* Read a STRING_CST from the string table in DATA_IN using input
  34    block IB.  */
  35
  36 tree
  37 streamer_read_string_cst (struct data_in *data_in, struct lto_input_block *ib)
  38 {
  39   unsigned int len;
  40   const char * ptr;
  41
  42   ptr = streamer_read_indexed_string (data_in, ib, &len);
  43   if (!ptr)
  44     return NULL;
  45   return build_string (len, ptr);
  46 }
  47
  48
  49 /* Read an IDENTIFIER from the string table in DATA_IN using input
  50    block IB.  */
  51
  52 static tree
  53 input_identifier (struct data_in *data_in, struct lto_input_block *ib)
  54 {
  55   unsigned int len;
  56   const char *ptr;
  57
  58   ptr = streamer_read_indexed_string (data_in, ib, &len);
  59   if (!ptr)
  60     return NULL;
  61   return get_identifier_with_length (ptr, len);
  62 }
  63
  64
  65 /* Read a chain of tree nodes from input block IB. DATA_IN contains
  66    tables and descriptors for the file being read.  */
  67
  68 tree
  69 streamer_read_chain (struct lto_input_block *ib, struct data_in *data_in)
  70 {
  71   tree first, prev, curr;
  72
  73   /* The chain is written as NULL terminated list of trees.  */
  74   first = prev = NULL_TREE;
  75   do
  76     {
  77       curr = stream_read_tree (ib, data_in);
  78       if (prev)
  79         TREE_CHAIN (prev) = curr;
  80       else
  81         first = curr;
  82
  83       prev = curr;
  84     }
  85   while (curr);
  86
  87   return first;
  88 }
  89
  90
  91 /* Unpack all the non-pointer fields of the TS_BASE structure of
  92    expression EXPR from bitpack BP.  */
  93
  94 static void
  95 unpack_ts_base_value_fields (struct bitpack_d *bp, tree expr)
  96 {
  97   /* Note that the code for EXPR has already been unpacked to create EXPR in
  98      streamer_alloc_tree.  */
  99   if (!TYPE_P (expr))
 100     {
 101       TREE_SIDE_EFFECTS (expr) = (unsigned) bp_unpack_value (bp, 1);
 102       TREE_CONSTANT (expr) = (unsigned) bp_unpack_value (bp, 1);
 103       TREE_READONLY (expr) = (unsigned) bp_unpack_value (bp, 1);
 104
 105       /* TREE_PUBLIC is used on types to indicate that the type
 106          has a TYPE_CACHED_VALUES vector.  This is not streamed out,
 107          so we skip it here.  */
 108       TREE_PUBLIC (expr) = (unsigned) bp_unpack_value (bp, 1);
 109     }
 110   else
 111     bp_unpack_value (bp, 4);
 112   TREE_ADDRESSABLE (expr) = (unsigned) bp_unpack_value (bp, 1);
 113   TREE_THIS_VOLATILE (expr) = (unsigned) bp_unpack_value (bp, 1);
 114   if (DECL_P (expr))
 115     DECL_UNSIGNED (expr) = (unsigned) bp_unpack_value (bp, 1);
 116   else if (TYPE_P (expr))
 117     TYPE_UNSIGNED (expr) = (unsigned) bp_unpack_value (bp, 1);
 118   else
 119     bp_unpack_value (bp, 1);
 120   TREE_ASM_WRITTEN (expr) = (unsigned) bp_unpack_value (bp, 1);
 121   if (TYPE_P (expr))
 122     TYPE_ARTIFICIAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 123   else
 124     TREE_NO_WARNING (expr) = (unsigned) bp_unpack_value (bp, 1);
 125   TREE_USED (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   TREE_PRIVATE (expr) = (unsigned) bp_unpack_value (bp, 1);
 129   TREE_PROTECTED (expr) = (unsigned) bp_unpack_value (bp, 1);
 130   TREE_DEPRECATED (expr) = (unsigned) bp_unpack_value (bp, 1);
 131   if (TYPE_P (expr))
 132     {
 133       TYPE_SATURATING (expr) = (unsigned) bp_unpack_value (bp, 1);
 134       TYPE_ADDR_SPACE (expr) = (unsigned) bp_unpack_value (bp, 8);
 135     }
 136   else if (TREE_CODE (expr) == SSA_NAME)
 137     SSA_NAME_IS_DEFAULT_DEF (expr) = (unsigned) bp_unpack_value (bp, 1);
 138   else
 139     bp_unpack_value (bp, 1);
 140 }
 141
 142
 143 /* Unpack all the non-pointer fields of the TS_INT_CST structure of
 144    expression EXPR from bitpack BP.  */
 145
 146 static void
 147 unpack_ts_int_cst_value_fields (struct bitpack_d *bp, tree expr)
 148 {
 149   TREE_INT_CST_LOW (expr) = bp_unpack_var_len_unsigned (bp);
 150   TREE_INT_CST_HIGH (expr) = bp_unpack_var_len_int (bp);
 151 }
 152
 153
 154 /* Unpack all the non-pointer fields of the TS_REAL_CST structure of
 155    expression EXPR from bitpack BP.  */
 156
 157 static void
 158 unpack_ts_real_cst_value_fields (struct bitpack_d *bp, tree expr)
 159 {
 160   unsigned i;
 161   REAL_VALUE_TYPE r;
 162   REAL_VALUE_TYPE *rp;
 163
 164   r.cl = (unsigned) bp_unpack_value (bp, 2);
 165   r.decimal = (unsigned) bp_unpack_value (bp, 1);
 166   r.sign = (unsigned) bp_unpack_value (bp, 1);
 167   r.signalling = (unsigned) bp_unpack_value (bp, 1);
 168   r.canonical = (unsigned) bp_unpack_value (bp, 1);
 169   r.uexp = (unsigned) bp_unpack_value (bp, EXP_BITS);
 170   for (i = 0; i < SIGSZ; i++)
 171     r.sig[i] = (unsigned long) bp_unpack_value (bp, HOST_BITS_PER_LONG);
 172
 173   rp = ggc_alloc_real_value ();
 174   memcpy (rp, &r, sizeof (REAL_VALUE_TYPE));
 175   TREE_REAL_CST_PTR (expr) = rp;
 176 }
 177
 178
 179 /* Unpack all the non-pointer fields of the TS_FIXED_CST structure of
 180    expression EXPR from bitpack BP.  */
 181
 182 static void
 183 unpack_ts_fixed_cst_value_fields (struct bitpack_d *bp, tree expr)
 184 {
 185   FIXED_VALUE_TYPE *fp = ggc_alloc_fixed_value ();
 186   fp->mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 187   fp->data.low = bp_unpack_var_len_int (bp);
 188   fp->data.high = bp_unpack_var_len_int (bp);
 189   TREE_FIXED_CST_PTR (expr) = fp;
 190 }
 191
 192 /* Unpack all the non-pointer fields of the TS_DECL_COMMON structure
 193    of expression EXPR from bitpack BP.  */
 194
 195 static void
 196 unpack_ts_decl_common_value_fields (struct bitpack_d *bp, tree expr)
 197 {
 198   DECL_MODE (expr) = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 199   DECL_NONLOCAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 200   DECL_VIRTUAL_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 201   DECL_IGNORED_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 202   DECL_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
 203   DECL_ARTIFICIAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 204   DECL_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
 205   DECL_PRESERVE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 206   DECL_EXTERNAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 207   DECL_GIMPLE_REG_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 208   DECL_ALIGN (expr) = (unsigned) bp_unpack_var_len_unsigned (bp);
 209
 210   if (TREE_CODE (expr) == LABEL_DECL)
 211     {
 212       DECL_ERROR_ISSUED (expr) = (unsigned) bp_unpack_value (bp, 1);
 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_DEFER_OUTPUT (expr) = (unsigned) bp_unpack_value (bp, 1);
 262   DECL_COMMON (expr) = (unsigned) bp_unpack_value (bp, 1);
 263   DECL_DLLIMPORT_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 264   DECL_WEAK (expr) = (unsigned) bp_unpack_value (bp, 1);
 265   DECL_SEEN_IN_BIND_EXPR_P (expr) = (unsigned) bp_unpack_value (bp,  1);
 266   DECL_COMDAT (expr) = (unsigned) bp_unpack_value (bp,  1);
 267   DECL_VISIBILITY (expr) = (enum symbol_visibility) bp_unpack_value (bp,  2);
 268   DECL_VISIBILITY_SPECIFIED (expr) = (unsigned) bp_unpack_value (bp,  1);
 269
 270   if (TREE_CODE (expr) == VAR_DECL)
 271     {
 272       DECL_HARD_REGISTER (expr) = (unsigned) bp_unpack_value (bp, 1);
 273       DECL_IN_TEXT_SECTION (expr) = (unsigned) bp_unpack_value (bp, 1);
 274       DECL_IN_CONSTANT_POOL (expr) = (unsigned) bp_unpack_value (bp, 1);
 275       DECL_TLS_MODEL (expr) = (enum tls_model) bp_unpack_value (bp,  3);
 276     }
 277
 278   if (VAR_OR_FUNCTION_DECL_P (expr))
 279     {
 280       priority_type p;
 281       p = (priority_type) bp_unpack_var_len_unsigned (bp);
 282       SET_DECL_INIT_PRIORITY (expr, p);
 283     }
 284 }
 285
 286
 287 /* Unpack all the non-pointer fields of the TS_FUNCTION_DECL structure
 288    of expression EXPR from bitpack BP.  */
 289
 290 static void
 291 unpack_ts_function_decl_value_fields (struct bitpack_d *bp, tree expr)
 292 {
 293   DECL_BUILT_IN_CLASS (expr) = bp_unpack_enum (bp, built_in_class,
 294                                                BUILT_IN_LAST);
 295   DECL_STATIC_CONSTRUCTOR (expr) = (unsigned) bp_unpack_value (bp, 1);
 296   DECL_STATIC_DESTRUCTOR (expr) = (unsigned) bp_unpack_value (bp, 1);
 297   DECL_UNINLINABLE (expr) = (unsigned) bp_unpack_value (bp, 1);
 298   DECL_POSSIBLY_INLINED (expr) = (unsigned) bp_unpack_value (bp, 1);
 299   DECL_IS_NOVOPS (expr) = (unsigned) bp_unpack_value (bp, 1);
 300   DECL_IS_RETURNS_TWICE (expr) = (unsigned) bp_unpack_value (bp, 1);
 301   DECL_IS_MALLOC (expr) = (unsigned) bp_unpack_value (bp, 1);
 302   DECL_IS_OPERATOR_NEW (expr) = (unsigned) bp_unpack_value (bp, 1);
 303   DECL_DECLARED_INLINE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 304   DECL_STATIC_CHAIN (expr) = (unsigned) bp_unpack_value (bp, 1);
 305   DECL_NO_INLINE_WARNING_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 306   DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (expr)
 307                         = (unsigned) bp_unpack_value (bp, 1);
 308   DECL_NO_LIMIT_STACK (expr) = (unsigned) bp_unpack_value (bp, 1);
 309   DECL_DISREGARD_INLINE_LIMITS (expr) = (unsigned) bp_unpack_value (bp, 1);
 310   DECL_PURE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 311   DECL_LOOPING_CONST_OR_PURE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 312   if (DECL_BUILT_IN_CLASS (expr) != NOT_BUILT_IN)
 313     {
 314       DECL_FUNCTION_CODE (expr) = (enum built_in_function) bp_unpack_value (bp,
 315                                                                             11);
 316       if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_NORMAL
 317           && DECL_FUNCTION_CODE (expr) >= END_BUILTINS)
 318         fatal_error ("machine independent builtin code out of range");
 319       else if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_MD)
 320         {
 321           tree result = targetm.builtin_decl (DECL_FUNCTION_CODE (expr), true);
 322           if (!result || result == error_mark_node)
 323             fatal_error ("target specific builtin not available");
 324         }
 325     }
 326   if (DECL_STATIC_DESTRUCTOR (expr))
 327     {
 328       priority_type p;
 329       p = (priority_type) bp_unpack_var_len_unsigned (bp);
 330       SET_DECL_FINI_PRIORITY (expr, p);
 331     }
 332 }
 333
 334
 335 /* Unpack all the non-pointer fields of the TS_TYPE_COMMON structure
 336    of expression EXPR from bitpack BP.  */
 337
 338 static void
 339 unpack_ts_type_common_value_fields (struct bitpack_d *bp, tree expr)
 340 {
 341   enum machine_mode mode;
 342
 343   mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 344   SET_TYPE_MODE (expr, mode);
 345   TYPE_STRING_FLAG (expr) = (unsigned) bp_unpack_value (bp, 1);
 346   TYPE_NO_FORCE_BLK (expr) = (unsigned) bp_unpack_value (bp, 1);
 347   TYPE_NEEDS_CONSTRUCTING (expr) = (unsigned) bp_unpack_value (bp, 1);
 348   if (RECORD_OR_UNION_TYPE_P (expr))
 349     TYPE_TRANSPARENT_AGGR (expr) = (unsigned) bp_unpack_value (bp, 1);
 350   else if (TREE_CODE (expr) == ARRAY_TYPE)
 351     TYPE_NONALIASED_COMPONENT (expr) = (unsigned) bp_unpack_value (bp, 1);
 352   TYPE_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
 353   TYPE_RESTRICT (expr) = (unsigned) bp_unpack_value (bp, 1);
 354   TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr)
 355         = (unsigned) bp_unpack_value (bp, 2);
 356   TYPE_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
 357   TYPE_READONLY (expr) = (unsigned) bp_unpack_value (bp, 1);
 358   TYPE_PRECISION (expr) = bp_unpack_var_len_unsigned (bp);
 359   TYPE_ALIGN (expr) = bp_unpack_var_len_unsigned (bp);
 360   TYPE_ALIAS_SET (expr) = bp_unpack_var_len_int (bp);
 361 }
 362
 363
 364 /* Unpack all the non-pointer fields of the TS_BLOCK structure
 365    of expression EXPR from bitpack BP.  */
 366
 367 static void
 368 unpack_ts_block_value_fields (struct data_in *data_in,
 369                               struct bitpack_d *bp, tree expr)
 370 {
 371   BLOCK_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
 372   /* BLOCK_NUMBER is recomputed.  */
 373   BLOCK_SOURCE_LOCATION (expr) = stream_input_location (bp, data_in);
 374 }
 375
 376 /* Unpack all the non-pointer fields of the TS_TRANSLATION_UNIT_DECL
 377    structure of expression EXPR from bitpack BP.  */
 378
 379 static void
 380 unpack_ts_translation_unit_decl_value_fields (struct data_in *data_in,
 381                                               struct bitpack_d *bp, tree expr)
 382 {
 383   TRANSLATION_UNIT_LANGUAGE (expr) = xstrdup (bp_unpack_string (data_in, bp));
 384   vec_safe_push (all_translation_units, expr);
 385 }
 386
 387 /* Unpack a TS_TARGET_OPTION tree from BP into EXPR.  */
 388
 389 static void
 390 unpack_ts_target_option (struct bitpack_d *bp, tree expr)
 391 {
 392   unsigned i, len;
 393   struct cl_target_option *t = TREE_TARGET_OPTION (expr);
 394
 395   len = sizeof (struct cl_target_option);
 396   for (i = 0; i < len; i++)
 397     ((unsigned char *)t)[i] = bp_unpack_value (bp, 8);
 398   if (bp_unpack_value (bp, 32) != 0x12345678)
 399     fatal_error ("cl_target_option size mismatch in LTO reader and writer");
 400 }
 401
 402 /* Unpack a TS_OPTIMIZATION tree from BP into EXPR.  */
 403
 404 static void
 405 unpack_ts_optimization (struct bitpack_d *bp, tree expr)
 406 {
 407   unsigned i, len;
 408   struct cl_optimization *t = TREE_OPTIMIZATION (expr);
 409
 410   len = sizeof (struct cl_optimization);
 411   for (i = 0; i < len; i++)
 412     ((unsigned char *)t)[i] = bp_unpack_value (bp, 8);
 413   if (bp_unpack_value (bp, 32) != 0x12345678)
 414     fatal_error ("cl_optimization size mismatch in LTO reader and writer");
 415 }
 416
 417
 418 /* Unpack all the non-pointer fields in EXPR into a bit pack.  */
 419
 420 static void
 421 unpack_value_fields (struct data_in *data_in, struct bitpack_d *bp, tree expr)
 422 {
 423   enum tree_code code;
 424
 425   code = TREE_CODE (expr);
 426
 427   /* Note that all these functions are highly sensitive to changes in
 428      the types and sizes of each of the fields being packed.  */
 429   unpack_ts_base_value_fields (bp, expr);
 430
 431   if (CODE_CONTAINS_STRUCT (code, TS_INT_CST))
 432     unpack_ts_int_cst_value_fields (bp, expr);
 433
 434   if (CODE_CONTAINS_STRUCT (code, TS_REAL_CST))
 435     unpack_ts_real_cst_value_fields (bp, expr);
 436
 437   if (CODE_CONTAINS_STRUCT (code, TS_FIXED_CST))
 438     unpack_ts_fixed_cst_value_fields (bp, expr);
 439
 440   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 441     DECL_SOURCE_LOCATION (expr) = stream_input_location (bp, data_in);
 442
 443   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 444     unpack_ts_decl_common_value_fields (bp, expr);
 445
 446   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WRTL))
 447     unpack_ts_decl_wrtl_value_fields (bp, expr);
 448
 449   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 450     unpack_ts_decl_with_vis_value_fields (bp, expr);
 451
 452   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 453     unpack_ts_function_decl_value_fields (bp, expr);
 454
 455   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 456     unpack_ts_type_common_value_fields (bp, expr);
 457
 458   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 459     SET_EXPR_LOCATION (expr, stream_input_location (bp, data_in));
 460
 461   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 462     unpack_ts_block_value_fields (data_in, bp, expr);
 463
 464   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
 465     unpack_ts_translation_unit_decl_value_fields (data_in, bp, expr);
 466
 467   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION))
 468     unpack_ts_target_option (bp, expr);
 469
 470   if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION))
 471     unpack_ts_optimization (bp, expr);
 472
 473   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 474     {
 475       unsigned HOST_WIDE_INT length = bp_unpack_var_len_unsigned (bp);
 476       if (length > 0)
 477         vec_safe_grow (BINFO_BASE_ACCESSES (expr), length);
 478     }
 479
 480   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
 481     {
 482       unsigned HOST_WIDE_INT length = bp_unpack_var_len_unsigned (bp);
 483       if (length > 0)
 484         vec_safe_grow (CONSTRUCTOR_ELTS (expr), length);
 485     }
 486 }
 487
 488
 489 /* Read all the language-independent bitfield values for EXPR from IB.
 490    Return the partially unpacked bitpack so the caller can unpack any other
 491    bitfield values that the writer may have written.  */
 492
 493 struct bitpack_d
 494 streamer_read_tree_bitfields (struct lto_input_block *ib,
 495                               struct data_in *data_in, tree expr)
 496 {
 497   enum tree_code code;
 498   struct bitpack_d bp;
 499
 500   /* Read the bitpack of non-pointer values from IB.  */
 501   bp = streamer_read_bitpack (ib);
 502
 503   /* The first word in BP contains the code of the tree that we
 504      are about to read.  */
 505   code = (enum tree_code) bp_unpack_value (&bp, 16);
 506   lto_tag_check (lto_tree_code_to_tag (code),
 507                  lto_tree_code_to_tag (TREE_CODE (expr)));
 508
 509   /* Unpack all the value fields from BP.  */
 510   unpack_value_fields (data_in, &bp, expr);
 511
 512   return bp;
 513 }
 514
 515
 516 /* Materialize a new tree from input block IB using descriptors in
 517    DATA_IN.  The code for the new tree should match TAG.  Store in
 518    *IX_P the index into the reader cache where the new tree is stored.  */
 519
 520 tree
 521 streamer_alloc_tree (struct lto_input_block *ib, struct data_in *data_in,
 522                      enum LTO_tags tag)
 523 {
 524   enum tree_code code;
 525   tree result;
 526 #ifdef LTO_STREAMER_DEBUG
 527   HOST_WIDEST_INT orig_address_in_writer;
 528 #endif
 529
 530   result = NULL_TREE;
 531
 532 #ifdef LTO_STREAMER_DEBUG
 533   /* Read the word representing the memory address for the tree
 534      as it was written by the writer.  This is useful when
 535      debugging differences between the writer and reader.  */
 536   orig_address_in_writer = streamer_read_hwi (ib);
 537   gcc_assert ((intptr_t) orig_address_in_writer == orig_address_in_writer);
 538 #endif
 539
 540   code = lto_tag_to_tree_code (tag);
 541
 542   /* We should never see an SSA_NAME tree.  Only the version numbers of
 543      SSA names are ever written out.  See input_ssa_names.  */
 544   gcc_assert (code != SSA_NAME);
 545
 546   /* Instantiate a new tree using the header data.  */
 547   if (CODE_CONTAINS_STRUCT (code, TS_STRING))
 548     result = streamer_read_string_cst (data_in, ib);
 549   else if (CODE_CONTAINS_STRUCT (code, TS_IDENTIFIER))
 550     result = input_identifier (data_in, ib);
 551   else if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 552     {
 553       HOST_WIDE_INT len = streamer_read_hwi (ib);
 554       result = make_tree_vec (len);
 555     }
 556   else if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 557     {
 558       HOST_WIDE_INT len = streamer_read_hwi (ib);
 559       result = make_vector (len);
 560     }
 561   else if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 562     {
 563       unsigned HOST_WIDE_INT len = streamer_read_uhwi (ib);
 564       result = make_tree_binfo (len);
 565     }
 566   else if (code == CALL_EXPR)
 567     {
 568       unsigned HOST_WIDE_INT nargs = streamer_read_uhwi (ib);
 569       return build_vl_exp (CALL_EXPR, nargs + 3);
 570     }
 571   else
 572     {
 573       /* For all other nodes, materialize the tree with a raw
 574          make_node call.  */
 575       result = make_node (code);
 576     }
 577
 578 #ifdef LTO_STREAMER_DEBUG
 579   /* Store the original address of the tree as seen by the writer
 580      in RESULT's aux field.  This is useful when debugging streaming
 581      problems.  This way, a debugging session can be started on
 582      both writer and reader with a breakpoint using this address
 583      value in both.  */
 584   lto_orig_address_map (result, (intptr_t) orig_address_in_writer);
 585 #endif
 586
 587   return result;
 588 }
 589
 590
 591 /* Read all pointer fields in the TS_COMMON structure of EXPR from input
 592    block IB.  DATA_IN contains tables and descriptors for the
 593    file being read.  */
 594
 595
 596 static void
 597 lto_input_ts_common_tree_pointers (struct lto_input_block *ib,
 598                                    struct data_in *data_in, tree expr)
 599 {
 600   if (TREE_CODE (expr) != IDENTIFIER_NODE)
 601     TREE_TYPE (expr) = stream_read_tree (ib, data_in);
 602 }
 603
 604
 605 /* Read all pointer fields in the TS_VECTOR structure of EXPR from input
 606    block IB.  DATA_IN contains tables and descriptors for the
 607    file being read.  */
 608
 609 static void
 610 lto_input_ts_vector_tree_pointers (struct lto_input_block *ib,
 611                                    struct data_in *data_in, tree expr)
 612 {
 613   unsigned i;
 614   for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
 615     VECTOR_CST_ELT (expr, i) = stream_read_tree (ib, data_in);
 616 }
 617
 618
 619 /* Read all pointer fields in the TS_COMPLEX structure of EXPR from input
 620    block IB.  DATA_IN contains tables and descriptors for the
 621    file being read.  */
 622
 623 static void
 624 lto_input_ts_complex_tree_pointers (struct lto_input_block *ib,
 625                                     struct data_in *data_in, tree expr)
 626 {
 627   TREE_REALPART (expr) = stream_read_tree (ib, data_in);
 628   TREE_IMAGPART (expr) = stream_read_tree (ib, data_in);
 629 }
 630
 631
 632 /* Read all pointer fields in the TS_DECL_MINIMAL structure of EXPR
 633    from input block IB.  DATA_IN contains tables and descriptors for the
 634    file being read.  */
 635
 636 static void
 637 lto_input_ts_decl_minimal_tree_pointers (struct lto_input_block *ib,
 638                                          struct data_in *data_in, tree expr)
 639 {
 640   DECL_NAME (expr) = stream_read_tree (ib, data_in);
 641   DECL_CONTEXT (expr) = stream_read_tree (ib, data_in);
 642 }
 643
 644
 645 /* Read all pointer fields in the TS_DECL_COMMON structure of EXPR from
 646    input block IB.  DATA_IN contains tables and descriptors for the
 647    file being read.  */
 648
 649 static void
 650 lto_input_ts_decl_common_tree_pointers (struct lto_input_block *ib,
 651                                         struct data_in *data_in, tree expr)
 652 {
 653   DECL_SIZE (expr) = stream_read_tree (ib, data_in);
 654   DECL_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 655   DECL_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 656
 657   /* Do not stream DECL_ABSTRACT_ORIGIN.  We cannot handle debug information
 658      for early inlining so drop it on the floor instead of ICEing in
 659      dwarf2out.c.  */
 660
 661   if ((TREE_CODE (expr) == VAR_DECL
 662        || TREE_CODE (expr) == PARM_DECL)
 663       && DECL_HAS_VALUE_EXPR_P (expr))
 664     SET_DECL_VALUE_EXPR (expr, stream_read_tree (ib, data_in));
 665
 666   if (TREE_CODE (expr) == VAR_DECL)
 667     {
 668       tree dexpr = stream_read_tree (ib, data_in);
 669       if (dexpr)
 670         SET_DECL_DEBUG_EXPR (expr, dexpr);
 671     }
 672 }
 673
 674
 675 /* Read all pointer fields in the TS_DECL_NON_COMMON structure of
 676    EXPR from input block IB.  DATA_IN contains tables and descriptors for the
 677    file being read.  */
 678
 679 static void
 680 lto_input_ts_decl_non_common_tree_pointers (struct lto_input_block *ib,
 681                                             struct data_in *data_in, tree expr)
 682 {
 683   if (TREE_CODE (expr) == FUNCTION_DECL)
 684     {
 685       DECL_ARGUMENTS (expr) = streamer_read_chain (ib, data_in);
 686       DECL_RESULT (expr) = stream_read_tree (ib, data_in);
 687     }
 688   else 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) = streamer_read_chain (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
 934   BINFO_INHERITANCE_CHAIN (expr) = stream_read_tree (ib, data_in);
 935   BINFO_SUBVTT_INDEX (expr) = stream_read_tree (ib, data_in);
 936   BINFO_VPTR_INDEX (expr) = stream_read_tree (ib, data_in);
 937 }
 938
 939
 940 /* Read all pointer fields in the TS_CONSTRUCTOR structure of EXPR from
 941    input block IB.  DATA_IN contains tables and descriptors for the
 942    file being read.  */
 943
 944 static void
 945 lto_input_ts_constructor_tree_pointers (struct lto_input_block *ib,
 946                                         struct data_in *data_in, tree expr)
 947 {
 948   unsigned i;
 949
 950   for (i = 0; i < CONSTRUCTOR_NELTS (expr); i++)
 951     {
 952       constructor_elt e;
 953       e.index = stream_read_tree (ib, data_in);
 954       e.value = stream_read_tree (ib, data_in);
 955       (*CONSTRUCTOR_ELTS (expr))[i] = e;
 956     }
 957 }
 958
 959
 960 /* Read all pointer fields in EXPR from input block IB.  DATA_IN
 961    contains tables and descriptors for the file being read.  */
 962
 963 void
 964 streamer_read_tree_body (struct lto_input_block *ib, struct data_in *data_in,
 965                          tree expr)
 966 {
 967   enum tree_code code;
 968
 969   code = TREE_CODE (expr);
 970
 971   if (CODE_CONTAINS_STRUCT (code, TS_TYPED))
 972     lto_input_ts_common_tree_pointers (ib, data_in, expr);
 973
 974   if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 975     lto_input_ts_vector_tree_pointers (ib, data_in, expr);
 976
 977   if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX))
 978     lto_input_ts_complex_tree_pointers (ib, data_in, expr);
 979
 980   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 981     lto_input_ts_decl_minimal_tree_pointers (ib, data_in, expr);
 982
 983   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 984     lto_input_ts_decl_common_tree_pointers (ib, data_in, expr);
 985
 986   if (CODE_CONTAINS_STRUCT (code, TS_DECL_NON_COMMON))
 987     lto_input_ts_decl_non_common_tree_pointers (ib, data_in, expr);
 988
 989   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 990     lto_input_ts_decl_with_vis_tree_pointers (ib, data_in, expr);
 991
 992   if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL))
 993     lto_input_ts_field_decl_tree_pointers (ib, data_in, expr);
 994
 995   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 996     lto_input_ts_function_decl_tree_pointers (ib, data_in, expr);
 997
 998   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 999     lto_input_ts_type_common_tree_pointers (ib, data_in, expr);
1000
1001   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON))
1002     lto_input_ts_type_non_common_tree_pointers (ib, data_in, expr);
1003
1004   if (CODE_CONTAINS_STRUCT (code, TS_LIST))
1005     lto_input_ts_list_tree_pointers (ib, data_in, expr);
1006
1007   if (CODE_CONTAINS_STRUCT (code, TS_VEC))
1008     lto_input_ts_vec_tree_pointers (ib, data_in, expr);
1009
1010   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
1011     lto_input_ts_exp_tree_pointers (ib, data_in, expr);
1012
1013   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
1014     lto_input_ts_block_tree_pointers (ib, data_in, expr);
1015
1016   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
1017     lto_input_ts_binfo_tree_pointers (ib, data_in, expr);
1018
1019   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
1020     lto_input_ts_constructor_tree_pointers (ib, data_in, expr);
1021 }
1022
1023
1024 /* Read and INTEGER_CST node from input block IB using the per-file
1025    context in DATA_IN.  */
1026
1027 tree
1028 streamer_read_integer_cst (struct lto_input_block *ib, struct data_in *data_in)
1029 {
1030   tree type = stream_read_tree (ib, data_in);
1031   unsigned HOST_WIDE_INT low = streamer_read_uhwi (ib);
1032   HOST_WIDE_INT high = streamer_read_hwi (ib);
1033   return build_int_cst_wide (type, low, high);
1034 }
1035
1036
1037 /* Read an index IX from input block IB and return the tree node at
1038    DATA_IN->FILE_DATA->GLOBALS_INDEX[IX].  */
1039
1040 tree
1041 streamer_get_pickled_tree (struct lto_input_block *ib, struct data_in *data_in)
1042 {
1043   unsigned HOST_WIDE_INT ix;
1044   tree result;
1045   enum LTO_tags expected_tag;
1046
1047   ix = streamer_read_uhwi (ib);
1048   expected_tag = streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
1049
1050   result = streamer_tree_cache_get (data_in->reader_cache, ix);
1051   gcc_assert (result
1052               && TREE_CODE (result) == lto_tag_to_tree_code (expected_tag));
1053
1054   return result;
1055 }
1056
1057
1058 /* Read a code and class from input block IB and return the
1059    corresponding builtin.  DATA_IN is as in stream_read_tree.  */
1060
1061 tree
1062 streamer_get_builtin_tree (struct lto_input_block *ib, struct data_in *data_in)
1063 {
1064   enum built_in_class fclass;
1065   enum built_in_function fcode;
1066   const char *asmname;
1067   tree result;
1068
1069   fclass = streamer_read_enum (ib, built_in_class, BUILT_IN_LAST);
1070   gcc_assert (fclass == BUILT_IN_NORMAL || fclass == BUILT_IN_MD);
1071
1072   fcode = (enum built_in_function) streamer_read_uhwi (ib);
1073
1074   if (fclass == BUILT_IN_NORMAL)
1075     {
1076       if (fcode >= END_BUILTINS)
1077         fatal_error ("machine independent builtin code out of range");
1078       result = builtin_decl_explicit (fcode);
1079       gcc_assert (result);
1080     }
1081   else if (fclass == BUILT_IN_MD)
1082     {
1083       result = targetm.builtin_decl (fcode, true);
1084       if (!result || result == error_mark_node)
1085         fatal_error ("target specific builtin not available");
1086     }
1087   else
1088     gcc_unreachable ();
1089
1090   asmname = streamer_read_string (data_in, ib);
1091   if (asmname)
1092     set_builtin_user_assembler_name (result, asmname);
1093
1094   streamer_tree_cache_append (data_in->reader_cache, result);
1095
1096   return result;
1097 }