gcc/tree-streamer-in.c

   1 /* Routines for reading trees from a file stream.
   2
   3    Copyright 2011 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_DEBUG_EXPR_IS_FROM (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       DECL_ERROR_ISSUED (expr) = (unsigned) bp_unpack_value (bp, 1);
 214       EH_LANDING_PAD_NR (expr) = (int) bp_unpack_var_len_unsigned (bp);
 215
 216       /* Always assume an initial value of -1 for LABEL_DECL_UID to
 217          force gimple_set_bb to recreate label_to_block_map.  */
 218       LABEL_DECL_UID (expr) = -1;
 219     }
 220
 221   if (TREE_CODE (expr) == FIELD_DECL)
 222     {
 223       DECL_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
 224       DECL_NONADDRESSABLE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 225       expr->decl_common.off_align = bp_unpack_value (bp, 8);
 226     }
 227
 228   if (TREE_CODE (expr) == VAR_DECL)
 229     DECL_NONLOCAL_FRAME (expr) = (unsigned) bp_unpack_value (bp, 1);
 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_DEFER_OUTPUT (expr) = (unsigned) bp_unpack_value (bp, 1);
 260   DECL_COMMON (expr) = (unsigned) bp_unpack_value (bp, 1);
 261   DECL_DLLIMPORT_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 262   DECL_WEAK (expr) = (unsigned) bp_unpack_value (bp, 1);
 263   DECL_SEEN_IN_BIND_EXPR_P (expr) = (unsigned) bp_unpack_value (bp,  1);
 264   DECL_COMDAT (expr) = (unsigned) bp_unpack_value (bp,  1);
 265   DECL_VISIBILITY (expr) = (enum symbol_visibility) bp_unpack_value (bp,  2);
 266   DECL_VISIBILITY_SPECIFIED (expr) = (unsigned) bp_unpack_value (bp,  1);
 267
 268   if (TREE_CODE (expr) == VAR_DECL)
 269     {
 270       DECL_HARD_REGISTER (expr) = (unsigned) bp_unpack_value (bp, 1);
 271       DECL_IN_TEXT_SECTION (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 (VAR_OR_FUNCTION_DECL_P (expr))
 277     {
 278       priority_type p;
 279       p = (priority_type) bp_unpack_var_len_unsigned (bp);
 280       SET_DECL_INIT_PRIORITY (expr, p);
 281     }
 282 }
 283
 284
 285 /* Unpack all the non-pointer fields of the TS_FUNCTION_DECL structure
 286    of expression EXPR from bitpack BP.  */
 287
 288 static void
 289 unpack_ts_function_decl_value_fields (struct bitpack_d *bp, tree expr)
 290 {
 291   DECL_BUILT_IN_CLASS (expr) = bp_unpack_enum (bp, built_in_class,
 292                                                BUILT_IN_LAST);
 293   DECL_STATIC_CONSTRUCTOR (expr) = (unsigned) bp_unpack_value (bp, 1);
 294   DECL_STATIC_DESTRUCTOR (expr) = (unsigned) bp_unpack_value (bp, 1);
 295   DECL_UNINLINABLE (expr) = (unsigned) bp_unpack_value (bp, 1);
 296   DECL_POSSIBLY_INLINED (expr) = (unsigned) bp_unpack_value (bp, 1);
 297   DECL_IS_NOVOPS (expr) = (unsigned) bp_unpack_value (bp, 1);
 298   DECL_IS_RETURNS_TWICE (expr) = (unsigned) bp_unpack_value (bp, 1);
 299   DECL_IS_MALLOC (expr) = (unsigned) bp_unpack_value (bp, 1);
 300   DECL_IS_OPERATOR_NEW (expr) = (unsigned) bp_unpack_value (bp, 1);
 301   DECL_DECLARED_INLINE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 302   DECL_STATIC_CHAIN (expr) = (unsigned) bp_unpack_value (bp, 1);
 303   DECL_NO_INLINE_WARNING_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 304   DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (expr)
 305                         = (unsigned) bp_unpack_value (bp, 1);
 306   DECL_NO_LIMIT_STACK (expr) = (unsigned) bp_unpack_value (bp, 1);
 307   DECL_DISREGARD_INLINE_LIMITS (expr) = (unsigned) bp_unpack_value (bp, 1);
 308   DECL_PURE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 309   DECL_LOOPING_CONST_OR_PURE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 310   if (DECL_BUILT_IN_CLASS (expr) != NOT_BUILT_IN)
 311     {
 312       DECL_FUNCTION_CODE (expr) = (enum built_in_function) bp_unpack_value (bp,
 313                                                                             11);
 314       if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_NORMAL
 315           && DECL_FUNCTION_CODE (expr) >= END_BUILTINS)
 316         fatal_error ("machine independent builtin code out of range");
 317       else if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_MD)
 318         {
 319           tree result = targetm.builtin_decl (DECL_FUNCTION_CODE (expr), true);
 320           if (!result || result == error_mark_node)
 321             fatal_error ("target specific builtin not available");
 322         }
 323     }
 324   if (DECL_STATIC_DESTRUCTOR (expr))
 325     {
 326       priority_type p;
 327       p = (priority_type) bp_unpack_var_len_unsigned (bp);
 328       SET_DECL_FINI_PRIORITY (expr, p);
 329     }
 330 }
 331
 332
 333 /* Unpack all the non-pointer fields of the TS_TYPE_COMMON structure
 334    of expression EXPR from bitpack BP.  */
 335
 336 static void
 337 unpack_ts_type_common_value_fields (struct bitpack_d *bp, tree expr)
 338 {
 339   enum machine_mode mode;
 340
 341   mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 342   SET_TYPE_MODE (expr, mode);
 343   TYPE_STRING_FLAG (expr) = (unsigned) bp_unpack_value (bp, 1);
 344   TYPE_NO_FORCE_BLK (expr) = (unsigned) bp_unpack_value (bp, 1);
 345   TYPE_NEEDS_CONSTRUCTING (expr) = (unsigned) bp_unpack_value (bp, 1);
 346   if (RECORD_OR_UNION_TYPE_P (expr))
 347     TYPE_TRANSPARENT_AGGR (expr) = (unsigned) bp_unpack_value (bp, 1);
 348   else if (TREE_CODE (expr) == ARRAY_TYPE)
 349     TYPE_NONALIASED_COMPONENT (expr) = (unsigned) bp_unpack_value (bp, 1);
 350   TYPE_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
 351   TYPE_RESTRICT (expr) = (unsigned) bp_unpack_value (bp, 1);
 352   TYPE_CONTAINS_PLACEHOLDER_INTERNAL (expr)
 353         = (unsigned) bp_unpack_value (bp, 2);
 354   TYPE_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
 355   TYPE_READONLY (expr) = (unsigned) bp_unpack_value (bp, 1);
 356   TYPE_PRECISION (expr) = bp_unpack_var_len_unsigned (bp);
 357   TYPE_ALIGN (expr) = bp_unpack_var_len_unsigned (bp);
 358   TYPE_ALIAS_SET (expr) = bp_unpack_var_len_int (bp);
 359 }
 360
 361
 362 /* Unpack all the non-pointer fields of the TS_BLOCK structure
 363    of expression EXPR from bitpack BP.  */
 364
 365 static void
 366 unpack_ts_block_value_fields (struct data_in *data_in,
 367                               struct bitpack_d *bp, tree expr)
 368 {
 369   BLOCK_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
 370   /* BLOCK_NUMBER is recomputed.  */
 371   BLOCK_SOURCE_LOCATION (expr) = stream_input_location (bp, data_in);
 372 }
 373
 374 /* Unpack all the non-pointer fields of the TS_TRANSLATION_UNIT_DECL
 375    structure of expression EXPR from bitpack BP.  */
 376
 377 static void
 378 unpack_ts_translation_unit_decl_value_fields (struct data_in *data_in,
 379                                               struct bitpack_d *bp, tree expr)
 380 {
 381   TRANSLATION_UNIT_LANGUAGE (expr) = xstrdup (bp_unpack_string (data_in, bp));
 382   vec_safe_push (all_translation_units, expr);
 383 }
 384
 385 /* Unpack a TS_TARGET_OPTION tree from BP into EXPR.  */
 386
 387 static void
 388 unpack_ts_target_option (struct bitpack_d *bp, tree expr)
 389 {
 390   unsigned i, len;
 391   struct cl_target_option *t = TREE_TARGET_OPTION (expr);
 392
 393   len = sizeof (struct cl_target_option);
 394   for (i = 0; i < len; i++)
 395     ((unsigned char *)t)[i] = bp_unpack_value (bp, 8);
 396   if (bp_unpack_value (bp, 32) != 0x12345678)
 397     fatal_error ("cl_target_option size mismatch in LTO reader and writer");
 398 }
 399
 400 /* Unpack a TS_OPTIMIZATION tree from BP into EXPR.  */
 401
 402 static void
 403 unpack_ts_optimization (struct bitpack_d *bp, tree expr)
 404 {
 405   unsigned i, len;
 406   struct cl_optimization *t = TREE_OPTIMIZATION (expr);
 407
 408   len = sizeof (struct cl_optimization);
 409   for (i = 0; i < len; i++)
 410     ((unsigned char *)t)[i] = bp_unpack_value (bp, 8);
 411   if (bp_unpack_value (bp, 32) != 0x12345678)
 412     fatal_error ("cl_optimization size mismatch in LTO reader and writer");
 413 }
 414
 415
 416 /* Unpack all the non-pointer fields in EXPR into a bit pack.  */
 417
 418 static void
 419 unpack_value_fields (struct data_in *data_in, struct bitpack_d *bp, tree expr)
 420 {
 421   enum tree_code code;
 422
 423   code = TREE_CODE (expr);
 424
 425   /* Note that all these functions are highly sensitive to changes in
 426      the types and sizes of each of the fields being packed.  */
 427   unpack_ts_base_value_fields (bp, expr);
 428
 429   if (CODE_CONTAINS_STRUCT (code, TS_INT_CST))
 430     unpack_ts_int_cst_value_fields (bp, expr);
 431
 432   if (CODE_CONTAINS_STRUCT (code, TS_REAL_CST))
 433     unpack_ts_real_cst_value_fields (bp, expr);
 434
 435   if (CODE_CONTAINS_STRUCT (code, TS_FIXED_CST))
 436     unpack_ts_fixed_cst_value_fields (bp, expr);
 437
 438   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 439     DECL_SOURCE_LOCATION (expr) = stream_input_location (bp, data_in);
 440
 441   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 442     unpack_ts_decl_common_value_fields (bp, expr);
 443
 444   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WRTL))
 445     unpack_ts_decl_wrtl_value_fields (bp, expr);
 446
 447   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 448     unpack_ts_decl_with_vis_value_fields (bp, expr);
 449
 450   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 451     unpack_ts_function_decl_value_fields (bp, expr);
 452
 453   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 454     unpack_ts_type_common_value_fields (bp, expr);
 455
 456   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 457     SET_EXPR_LOCATION (expr, stream_input_location (bp, data_in));
 458
 459   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 460     unpack_ts_block_value_fields (data_in, bp, expr);
 461
 462   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
 463     unpack_ts_translation_unit_decl_value_fields (data_in, bp, expr);
 464
 465   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION))
 466     unpack_ts_target_option (bp, expr);
 467
 468   if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION))
 469     unpack_ts_optimization (bp, expr);
 470
 471   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 472     {
 473       unsigned HOST_WIDE_INT length = bp_unpack_var_len_unsigned (bp);
 474       if (length > 0)
 475         vec_safe_grow (BINFO_BASE_ACCESSES (expr), length);
 476     }
 477
 478   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
 479     {
 480       unsigned HOST_WIDE_INT length = bp_unpack_var_len_unsigned (bp);
 481       if (length > 0)
 482         vec_safe_grow (CONSTRUCTOR_ELTS (expr), length);
 483     }
 484 }
 485
 486
 487 /* Read all the language-independent bitfield values for EXPR from IB.
 488    Return the partially unpacked bitpack so the caller can unpack any other
 489    bitfield values that the writer may have written.  */
 490
 491 struct bitpack_d
 492 streamer_read_tree_bitfields (struct lto_input_block *ib,
 493                               struct data_in *data_in, tree expr)
 494 {
 495   enum tree_code code;
 496   struct bitpack_d bp;
 497
 498   /* Read the bitpack of non-pointer values from IB.  */
 499   bp = streamer_read_bitpack (ib);
 500
 501   /* The first word in BP contains the code of the tree that we
 502      are about to read.  */
 503   code = (enum tree_code) bp_unpack_value (&bp, 16);
 504   lto_tag_check (lto_tree_code_to_tag (code),
 505                  lto_tree_code_to_tag (TREE_CODE (expr)));
 506
 507   /* Unpack all the value fields from BP.  */
 508   unpack_value_fields (data_in, &bp, expr);
 509
 510   return bp;
 511 }
 512
 513
 514 /* Materialize a new tree from input block IB using descriptors in
 515    DATA_IN.  The code for the new tree should match TAG.  Store in
 516    *IX_P the index into the reader cache where the new tree is stored.  */
 517
 518 tree
 519 streamer_alloc_tree (struct lto_input_block *ib, struct data_in *data_in,
 520                      enum LTO_tags tag)
 521 {
 522   enum tree_code code;
 523   tree result;
 524 #ifdef LTO_STREAMER_DEBUG
 525   HOST_WIDEST_INT orig_address_in_writer;
 526 #endif
 527
 528   result = NULL_TREE;
 529
 530 #ifdef LTO_STREAMER_DEBUG
 531   /* Read the word representing the memory address for the tree
 532      as it was written by the writer.  This is useful when
 533      debugging differences between the writer and reader.  */
 534   orig_address_in_writer = streamer_read_hwi (ib);
 535   gcc_assert ((intptr_t) orig_address_in_writer == orig_address_in_writer);
 536 #endif
 537
 538   code = lto_tag_to_tree_code (tag);
 539
 540   /* We should never see an SSA_NAME tree.  Only the version numbers of
 541      SSA names are ever written out.  See input_ssa_names.  */
 542   gcc_assert (code != SSA_NAME);
 543
 544   /* Instantiate a new tree using the header data.  */
 545   if (CODE_CONTAINS_STRUCT (code, TS_STRING))
 546     result = streamer_read_string_cst (data_in, ib);
 547   else if (CODE_CONTAINS_STRUCT (code, TS_IDENTIFIER))
 548     result = input_identifier (data_in, ib);
 549   else if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 550     {
 551       HOST_WIDE_INT len = streamer_read_hwi (ib);
 552       result = make_tree_vec (len);
 553     }
 554   else if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 555     {
 556       HOST_WIDE_INT len = streamer_read_hwi (ib);
 557       result = make_vector (len);
 558     }
 559   else if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 560     {
 561       unsigned HOST_WIDE_INT len = streamer_read_uhwi (ib);
 562       result = make_tree_binfo (len);
 563     }
 564   else if (code == CALL_EXPR)
 565     {
 566       unsigned HOST_WIDE_INT nargs = streamer_read_uhwi (ib);
 567       return build_vl_exp (CALL_EXPR, nargs + 3);
 568     }
 569   else
 570     {
 571       /* For all other nodes, materialize the tree with a raw
 572          make_node call.  */
 573       result = make_node (code);
 574     }
 575
 576 #ifdef LTO_STREAMER_DEBUG
 577   /* Store the original address of the tree as seen by the writer
 578      in RESULT's aux field.  This is useful when debugging streaming
 579      problems.  This way, a debugging session can be started on
 580      both writer and reader with a breakpoint using this address
 581      value in both.  */
 582   lto_orig_address_map (result, (intptr_t) orig_address_in_writer);
 583 #endif
 584
 585   return result;
 586 }
 587
 588
 589 /* Read all pointer fields in the TS_COMMON structure of EXPR from input
 590    block IB.  DATA_IN contains tables and descriptors for the
 591    file being read.  */
 592
 593
 594 static void
 595 lto_input_ts_common_tree_pointers (struct lto_input_block *ib,
 596                                    struct data_in *data_in, tree expr)
 597 {
 598   if (TREE_CODE (expr) != IDENTIFIER_NODE)
 599     TREE_TYPE (expr) = stream_read_tree (ib, data_in);
 600 }
 601
 602
 603 /* Read all pointer fields in the TS_VECTOR structure of EXPR from input
 604    block IB.  DATA_IN contains tables and descriptors for the
 605    file being read.  */
 606
 607 static void
 608 lto_input_ts_vector_tree_pointers (struct lto_input_block *ib,
 609                                    struct data_in *data_in, tree expr)
 610 {
 611   unsigned i;
 612   for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
 613     VECTOR_CST_ELT (expr, i) = stream_read_tree (ib, data_in);
 614 }
 615
 616
 617 /* Read all pointer fields in the TS_COMPLEX structure of EXPR from input
 618    block IB.  DATA_IN contains tables and descriptors for the
 619    file being read.  */
 620
 621 static void
 622 lto_input_ts_complex_tree_pointers (struct lto_input_block *ib,
 623                                     struct data_in *data_in, tree expr)
 624 {
 625   TREE_REALPART (expr) = stream_read_tree (ib, data_in);
 626   TREE_IMAGPART (expr) = stream_read_tree (ib, data_in);
 627 }
 628
 629
 630 /* Read all pointer fields in the TS_DECL_MINIMAL structure of EXPR
 631    from input block IB.  DATA_IN contains tables and descriptors for the
 632    file being read.  */
 633
 634 static void
 635 lto_input_ts_decl_minimal_tree_pointers (struct lto_input_block *ib,
 636                                          struct data_in *data_in, tree expr)
 637 {
 638   DECL_NAME (expr) = stream_read_tree (ib, data_in);
 639   DECL_CONTEXT (expr) = stream_read_tree (ib, data_in);
 640 }
 641
 642
 643 /* Read all pointer fields in the TS_DECL_COMMON structure of EXPR from
 644    input block IB.  DATA_IN contains tables and descriptors for the
 645    file being read.  */
 646
 647 static void
 648 lto_input_ts_decl_common_tree_pointers (struct lto_input_block *ib,
 649                                         struct data_in *data_in, tree expr)
 650 {
 651   DECL_SIZE (expr) = stream_read_tree (ib, data_in);
 652   DECL_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 653   DECL_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 654
 655   /* Do not stream DECL_ABSTRACT_ORIGIN.  We cannot handle debug information
 656      for early inlining so drop it on the floor instead of ICEing in
 657      dwarf2out.c.  */
 658
 659   if ((TREE_CODE (expr) == VAR_DECL
 660        || TREE_CODE (expr) == PARM_DECL)
 661       && DECL_HAS_VALUE_EXPR_P (expr))
 662     SET_DECL_VALUE_EXPR (expr, stream_read_tree (ib, data_in));
 663
 664   if (TREE_CODE (expr) == VAR_DECL)
 665     {
 666       tree dexpr = stream_read_tree (ib, data_in);
 667       if (dexpr)
 668         SET_DECL_DEBUG_EXPR (expr, dexpr);
 669     }
 670 }
 671
 672
 673 /* Read all pointer fields in the TS_DECL_NON_COMMON structure of
 674    EXPR from input block IB.  DATA_IN contains tables and descriptors for the
 675    file being read.  */
 676
 677 static void
 678 lto_input_ts_decl_non_common_tree_pointers (struct lto_input_block *ib,
 679                                             struct data_in *data_in, tree expr)
 680 {
 681   if (TREE_CODE (expr) == FUNCTION_DECL)
 682     {
 683       DECL_ARGUMENTS (expr) = streamer_read_chain (ib, data_in);
 684       DECL_RESULT (expr) = stream_read_tree (ib, data_in);
 685     }
 686   else 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) = streamer_read_chain (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
 932   BINFO_INHERITANCE_CHAIN (expr) = stream_read_tree (ib, data_in);
 933   BINFO_SUBVTT_INDEX (expr) = stream_read_tree (ib, data_in);
 934   BINFO_VPTR_INDEX (expr) = stream_read_tree (ib, data_in);
 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 and INTEGER_CST node from input block IB using the per-file
1023    context in DATA_IN.  */
1024
1025 tree
1026 streamer_read_integer_cst (struct lto_input_block *ib, struct data_in *data_in)
1027 {
1028   tree type = stream_read_tree (ib, data_in);
1029   unsigned HOST_WIDE_INT low = streamer_read_uhwi (ib);
1030   HOST_WIDE_INT high = streamer_read_hwi (ib);
1031   return build_int_cst_wide (type, low, high);
1032 }
1033
1034
1035 /* Read an index IX from input block IB and return the tree node at
1036    DATA_IN->FILE_DATA->GLOBALS_INDEX[IX].  */
1037
1038 tree
1039 streamer_get_pickled_tree (struct lto_input_block *ib, struct data_in *data_in)
1040 {
1041   unsigned HOST_WIDE_INT ix;
1042   tree result;
1043   enum LTO_tags expected_tag;
1044
1045   ix = streamer_read_uhwi (ib);
1046   expected_tag = streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
1047
1048   result = streamer_tree_cache_get (data_in->reader_cache, ix);
1049   gcc_assert (result
1050               && TREE_CODE (result) == lto_tag_to_tree_code (expected_tag));
1051
1052   return result;
1053 }
1054
1055
1056 /* Read a code and class from input block IB and return the
1057    corresponding builtin.  DATA_IN is as in stream_read_tree.  */
1058
1059 tree
1060 streamer_get_builtin_tree (struct lto_input_block *ib, struct data_in *data_in)
1061 {
1062   enum built_in_class fclass;
1063   enum built_in_function fcode;
1064   const char *asmname;
1065   tree result;
1066
1067   fclass = streamer_read_enum (ib, built_in_class, BUILT_IN_LAST);
1068   gcc_assert (fclass == BUILT_IN_NORMAL || fclass == BUILT_IN_MD);
1069
1070   fcode = (enum built_in_function) streamer_read_uhwi (ib);
1071
1072   if (fclass == BUILT_IN_NORMAL)
1073     {
1074       if (fcode >= END_BUILTINS)
1075         fatal_error ("machine independent builtin code out of range");
1076       result = builtin_decl_explicit (fcode);
1077       gcc_assert (result);
1078     }
1079   else if (fclass == BUILT_IN_MD)
1080     {
1081       result = targetm.builtin_decl (fcode, true);
1082       if (!result || result == error_mark_node)
1083         fatal_error ("target specific builtin not available");
1084     }
1085   else
1086     gcc_unreachable ();
1087
1088   asmname = streamer_read_string (data_in, ib);
1089   if (asmname)
1090     set_builtin_user_assembler_name (result, asmname);
1091
1092   streamer_tree_cache_append (data_in->reader_cache, result);
1093
1094   return result;
1095 }