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_NOTHROW (expr) = (unsigned) bp_unpack_value (bp, 1);
 126   TREE_STATIC (expr) = (unsigned) bp_unpack_value (bp, 1);
 127   if (TREE_CODE (expr) != TREE_BINFO)
 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_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) == TYPE_DECL)
 682     DECL_ORIGINAL_TYPE (expr) = stream_read_tree (ib, data_in);
 683   DECL_VINDEX (expr) = stream_read_tree (ib, data_in);
 684 }
 685
 686
 687 /* Read all pointer fields in the TS_DECL_WITH_VIS structure of EXPR
 688    from input block IB.  DATA_IN contains tables and descriptors for the
 689    file being read.  */
 690
 691 static void
 692 lto_input_ts_decl_with_vis_tree_pointers (struct lto_input_block *ib,
 693                                           struct data_in *data_in, tree expr)
 694 {
 695   tree id;
 696
 697   id = stream_read_tree (ib, data_in);
 698   if (id)
 699     {
 700       gcc_assert (TREE_CODE (id) == IDENTIFIER_NODE);
 701       SET_DECL_ASSEMBLER_NAME (expr, id);
 702     }
 703
 704   DECL_SECTION_NAME (expr) = stream_read_tree (ib, data_in);
 705   DECL_COMDAT_GROUP (expr) = stream_read_tree (ib, data_in);
 706 }
 707
 708
 709 /* Read all pointer fields in the TS_FIELD_DECL structure of EXPR from
 710    input block IB.  DATA_IN contains tables and descriptors for the
 711    file being read.  */
 712
 713 static void
 714 lto_input_ts_field_decl_tree_pointers (struct lto_input_block *ib,
 715                                        struct data_in *data_in, tree expr)
 716 {
 717   DECL_FIELD_OFFSET (expr) = stream_read_tree (ib, data_in);
 718   DECL_BIT_FIELD_TYPE (expr) = stream_read_tree (ib, data_in);
 719   DECL_BIT_FIELD_REPRESENTATIVE (expr) = stream_read_tree (ib, data_in);
 720   DECL_FIELD_BIT_OFFSET (expr) = stream_read_tree (ib, data_in);
 721   DECL_FCONTEXT (expr) = stream_read_tree (ib, data_in);
 722 }
 723
 724
 725 /* Read all pointer fields in the TS_FUNCTION_DECL structure of EXPR
 726    from input block IB.  DATA_IN contains tables and descriptors for the
 727    file being read.  */
 728
 729 static void
 730 lto_input_ts_function_decl_tree_pointers (struct lto_input_block *ib,
 731                                           struct data_in *data_in, tree expr)
 732 {
 733   /* DECL_STRUCT_FUNCTION is handled by lto_input_function.  FIXME lto,
 734      maybe it should be handled here?  */
 735   DECL_FUNCTION_PERSONALITY (expr) = stream_read_tree (ib, data_in);
 736   DECL_FUNCTION_SPECIFIC_TARGET (expr) = stream_read_tree (ib, data_in);
 737   DECL_FUNCTION_SPECIFIC_OPTIMIZATION (expr) = stream_read_tree (ib, data_in);
 738
 739   /* If the file contains a function with an EH personality set,
 740      then it was compiled with -fexceptions.  In that case, initialize
 741      the backend EH machinery.  */
 742   if (DECL_FUNCTION_PERSONALITY (expr))
 743     lto_init_eh ();
 744 }
 745
 746
 747 /* Read all pointer fields in the TS_TYPE_COMMON structure of EXPR from
 748    input block IB.  DATA_IN contains tables and descriptors for the file
 749    being read.  */
 750
 751 static void
 752 lto_input_ts_type_common_tree_pointers (struct lto_input_block *ib,
 753                                         struct data_in *data_in, tree expr)
 754 {
 755   TYPE_SIZE (expr) = stream_read_tree (ib, data_in);
 756   TYPE_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 757   TYPE_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 758   TYPE_NAME (expr) = stream_read_tree (ib, data_in);
 759   /* Do not stream TYPE_POINTER_TO or TYPE_REFERENCE_TO.  They will be
 760      reconstructed during fixup.  */
 761   /* Do not stream TYPE_NEXT_VARIANT, we reconstruct the variant lists
 762      during fixup.  */
 763   TYPE_MAIN_VARIANT (expr) = stream_read_tree (ib, data_in);
 764   TYPE_CONTEXT (expr) = stream_read_tree (ib, data_in);
 765   /* TYPE_CANONICAL gets re-computed during type merging.  */
 766   TYPE_CANONICAL (expr) = NULL_TREE;
 767   TYPE_STUB_DECL (expr) = stream_read_tree (ib, data_in);
 768 }
 769
 770 /* Read all pointer fields in the TS_TYPE_NON_COMMON structure of EXPR
 771    from input block IB.  DATA_IN contains tables and descriptors for the
 772    file being read.  */
 773
 774 static void
 775 lto_input_ts_type_non_common_tree_pointers (struct lto_input_block *ib,
 776                                             struct data_in *data_in,
 777                                             tree expr)
 778 {
 779   if (TREE_CODE (expr) == ENUMERAL_TYPE)
 780     TYPE_VALUES (expr) = stream_read_tree (ib, data_in);
 781   else if (TREE_CODE (expr) == ARRAY_TYPE)
 782     TYPE_DOMAIN (expr) = stream_read_tree (ib, data_in);
 783   else if (RECORD_OR_UNION_TYPE_P (expr))
 784     TYPE_FIELDS (expr) = streamer_read_chain (ib, data_in);
 785   else if (TREE_CODE (expr) == FUNCTION_TYPE
 786            || TREE_CODE (expr) == METHOD_TYPE)
 787     TYPE_ARG_TYPES (expr) = stream_read_tree (ib, data_in);
 788
 789   if (!POINTER_TYPE_P (expr))
 790     TYPE_MINVAL (expr) = stream_read_tree (ib, data_in);
 791   TYPE_MAXVAL (expr) = stream_read_tree (ib, data_in);
 792   if (RECORD_OR_UNION_TYPE_P (expr))
 793     TYPE_BINFO (expr) = stream_read_tree (ib, data_in);
 794 }
 795
 796
 797 /* Read all pointer fields in the TS_LIST structure of EXPR from input
 798    block IB.  DATA_IN contains tables and descriptors for the
 799    file being read.  */
 800
 801 static void
 802 lto_input_ts_list_tree_pointers (struct lto_input_block *ib,
 803                                  struct data_in *data_in, tree expr)
 804 {
 805   TREE_PURPOSE (expr) = stream_read_tree (ib, data_in);
 806   TREE_VALUE (expr) = stream_read_tree (ib, data_in);
 807   TREE_CHAIN (expr) = stream_read_tree (ib, data_in);
 808 }
 809
 810
 811 /* Read all pointer fields in the TS_VEC structure of EXPR from input
 812    block IB.  DATA_IN contains tables and descriptors for the
 813    file being read.  */
 814
 815 static void
 816 lto_input_ts_vec_tree_pointers (struct lto_input_block *ib,
 817                                 struct data_in *data_in, tree expr)
 818 {
 819   int i;
 820
 821   /* Note that TREE_VEC_LENGTH was read by streamer_alloc_tree to
 822      instantiate EXPR.  */
 823   for (i = 0; i < TREE_VEC_LENGTH (expr); i++)
 824     TREE_VEC_ELT (expr, i) = stream_read_tree (ib, data_in);
 825 }
 826
 827
 828 /* Read all pointer fields in the TS_EXP structure of EXPR from input
 829    block IB.  DATA_IN contains tables and descriptors for the
 830    file being read.  */
 831
 832
 833 static void
 834 lto_input_ts_exp_tree_pointers (struct lto_input_block *ib,
 835                                 struct data_in *data_in, tree expr)
 836 {
 837   int i;
 838
 839   for (i = 0; i < TREE_OPERAND_LENGTH (expr); i++)
 840     TREE_OPERAND (expr, i) = stream_read_tree (ib, data_in);
 841
 842   TREE_SET_BLOCK (expr, stream_read_tree (ib, data_in));
 843 }
 844
 845
 846 /* Read all pointer fields in the TS_BLOCK structure of EXPR from input
 847    block IB.  DATA_IN contains tables and descriptors for the
 848    file being read.  */
 849
 850 static void
 851 lto_input_ts_block_tree_pointers (struct lto_input_block *ib,
 852                                   struct data_in *data_in, tree expr)
 853 {
 854   BLOCK_VARS (expr) = streamer_read_chain (ib, data_in);
 855
 856   BLOCK_SUPERCONTEXT (expr) = stream_read_tree (ib, data_in);
 857
 858   /* Stream BLOCK_ABSTRACT_ORIGIN and BLOCK_SOURCE_LOCATION for
 859      the limited cases we can handle - those that represent inlined
 860      function scopes.  For the rest them on the floor instead of ICEing in
 861      dwarf2out.c.  */
 862   BLOCK_ABSTRACT_ORIGIN (expr) = stream_read_tree (ib, data_in);
 863   /* Do not stream BLOCK_NONLOCALIZED_VARS.  We cannot handle debug information
 864      for early inlined BLOCKs so drop it on the floor instead of ICEing in
 865      dwarf2out.c.  */
 866
 867   /* BLOCK_FRAGMENT_ORIGIN and BLOCK_FRAGMENT_CHAIN is not live at LTO
 868      streaming time.  */
 869
 870   /* We re-compute BLOCK_SUBBLOCKS of our parent here instead
 871      of streaming it.  For non-BLOCK BLOCK_SUPERCONTEXTs we still
 872      stream the child relationship explicitly.  */
 873   if (BLOCK_SUPERCONTEXT (expr)
 874       && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == BLOCK)
 875     {
 876       BLOCK_CHAIN (expr) = BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr));
 877       BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr)) = expr;
 878     }
 879
 880   /* The global block is rooted at the TU decl.  Hook it here to
 881      avoid the need to stream in this block during WPA time.  */
 882   else if (BLOCK_SUPERCONTEXT (expr)
 883            && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == TRANSLATION_UNIT_DECL)
 884     DECL_INITIAL (BLOCK_SUPERCONTEXT (expr)) = expr;
 885
 886   /* The function-level block is connected at the time we read in
 887      function bodies for the same reason.  */
 888 }
 889
 890
 891 /* Read all pointer fields in the TS_BINFO structure of EXPR from input
 892    block IB.  DATA_IN contains tables and descriptors for the
 893    file being read.  */
 894
 895 static void
 896 lto_input_ts_binfo_tree_pointers (struct lto_input_block *ib,
 897                                   struct data_in *data_in, tree expr)
 898 {
 899   unsigned i;
 900   tree t;
 901
 902   /* Note that the number of slots in EXPR was read in
 903      streamer_alloc_tree when instantiating EXPR.  However, the
 904      vector is empty so we cannot rely on vec::length to know how many
 905      elements to read.  So, this list is emitted as a 0-terminated
 906      list on the writer side.  */
 907   do
 908     {
 909       t = stream_read_tree (ib, data_in);
 910       if (t)
 911         BINFO_BASE_BINFOS (expr)->quick_push (t);
 912     }
 913   while (t);
 914
 915   BINFO_OFFSET (expr) = stream_read_tree (ib, data_in);
 916   BINFO_VTABLE (expr) = stream_read_tree (ib, data_in);
 917   BINFO_VPTR_FIELD (expr) = stream_read_tree (ib, data_in);
 918
 919   /* The vector of BINFO_BASE_ACCESSES is pre-allocated during
 920      unpacking the bitfield section.  */
 921   for (i = 0; i < vec_safe_length (BINFO_BASE_ACCESSES (expr)); i++)
 922     {
 923       tree a = stream_read_tree (ib, data_in);
 924       (*BINFO_BASE_ACCESSES (expr))[i] = a;
 925     }
 926
 927   BINFO_INHERITANCE_CHAIN (expr) = stream_read_tree (ib, data_in);
 928   BINFO_SUBVTT_INDEX (expr) = stream_read_tree (ib, data_in);
 929   BINFO_VPTR_INDEX (expr) = stream_read_tree (ib, data_in);
 930 }
 931
 932
 933 /* Read all pointer fields in the TS_CONSTRUCTOR structure of EXPR from
 934    input block IB.  DATA_IN contains tables and descriptors for the
 935    file being read.  */
 936
 937 static void
 938 lto_input_ts_constructor_tree_pointers (struct lto_input_block *ib,
 939                                         struct data_in *data_in, tree expr)
 940 {
 941   unsigned i;
 942
 943   for (i = 0; i < CONSTRUCTOR_NELTS (expr); i++)
 944     {
 945       constructor_elt e;
 946       e.index = stream_read_tree (ib, data_in);
 947       e.value = stream_read_tree (ib, data_in);
 948       (*CONSTRUCTOR_ELTS (expr))[i] = e;
 949     }
 950 }
 951
 952
 953 /* Read all pointer fields in EXPR from input block IB.  DATA_IN
 954    contains tables and descriptors for the file being read.  */
 955
 956 void
 957 streamer_read_tree_body (struct lto_input_block *ib, struct data_in *data_in,
 958                          tree expr)
 959 {
 960   enum tree_code code;
 961
 962   code = TREE_CODE (expr);
 963
 964   if (CODE_CONTAINS_STRUCT (code, TS_TYPED))
 965     lto_input_ts_common_tree_pointers (ib, data_in, expr);
 966
 967   if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 968     lto_input_ts_vector_tree_pointers (ib, data_in, expr);
 969
 970   if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX))
 971     lto_input_ts_complex_tree_pointers (ib, data_in, expr);
 972
 973   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 974     lto_input_ts_decl_minimal_tree_pointers (ib, data_in, expr);
 975
 976   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 977     lto_input_ts_decl_common_tree_pointers (ib, data_in, expr);
 978
 979   if (CODE_CONTAINS_STRUCT (code, TS_DECL_NON_COMMON))
 980     lto_input_ts_decl_non_common_tree_pointers (ib, data_in, expr);
 981
 982   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 983     lto_input_ts_decl_with_vis_tree_pointers (ib, data_in, expr);
 984
 985   if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL))
 986     lto_input_ts_field_decl_tree_pointers (ib, data_in, expr);
 987
 988   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 989     lto_input_ts_function_decl_tree_pointers (ib, data_in, expr);
 990
 991   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 992     lto_input_ts_type_common_tree_pointers (ib, data_in, expr);
 993
 994   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON))
 995     lto_input_ts_type_non_common_tree_pointers (ib, data_in, expr);
 996
 997   if (CODE_CONTAINS_STRUCT (code, TS_LIST))
 998     lto_input_ts_list_tree_pointers (ib, data_in, expr);
 999
1000   if (CODE_CONTAINS_STRUCT (code, TS_VEC))
1001     lto_input_ts_vec_tree_pointers (ib, data_in, expr);
1002
1003   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
1004     lto_input_ts_exp_tree_pointers (ib, data_in, expr);
1005
1006   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
1007     lto_input_ts_block_tree_pointers (ib, data_in, expr);
1008
1009   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
1010     lto_input_ts_binfo_tree_pointers (ib, data_in, expr);
1011
1012   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
1013     lto_input_ts_constructor_tree_pointers (ib, data_in, expr);
1014 }
1015
1016
1017 /* Read an index IX from input block IB and return the tree node at
1018    DATA_IN->FILE_DATA->GLOBALS_INDEX[IX].  */
1019
1020 tree
1021 streamer_get_pickled_tree (struct lto_input_block *ib, struct data_in *data_in)
1022 {
1023   unsigned HOST_WIDE_INT ix;
1024   tree result;
1025   enum LTO_tags expected_tag;
1026
1027   ix = streamer_read_uhwi (ib);
1028   expected_tag = streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
1029
1030   result = streamer_tree_cache_get_tree (data_in->reader_cache, ix);
1031   gcc_assert (result
1032               && TREE_CODE (result) == lto_tag_to_tree_code (expected_tag));
1033
1034   return result;
1035 }
1036
1037
1038 /* Read a code and class from input block IB and return the
1039    corresponding builtin.  DATA_IN is as in stream_read_tree.  */
1040
1041 tree
1042 streamer_get_builtin_tree (struct lto_input_block *ib, struct data_in *data_in)
1043 {
1044   enum built_in_class fclass;
1045   enum built_in_function fcode;
1046   const char *asmname;
1047   tree result;
1048
1049   fclass = streamer_read_enum (ib, built_in_class, BUILT_IN_LAST);
1050   gcc_assert (fclass == BUILT_IN_NORMAL || fclass == BUILT_IN_MD);
1051
1052   fcode = (enum built_in_function) streamer_read_uhwi (ib);
1053
1054   if (fclass == BUILT_IN_NORMAL)
1055     {
1056       if (fcode >= END_BUILTINS)
1057         fatal_error ("machine independent builtin code out of range");
1058       result = builtin_decl_explicit (fcode);
1059       gcc_assert (result);
1060     }
1061   else if (fclass == BUILT_IN_MD)
1062     {
1063       result = targetm.builtin_decl (fcode, true);
1064       if (!result || result == error_mark_node)
1065         fatal_error ("target specific builtin not available");
1066     }
1067   else
1068     gcc_unreachable ();
1069
1070   asmname = streamer_read_string (data_in, ib);
1071   if (asmname)
1072     set_builtin_user_assembler_name (result, asmname);
1073
1074   streamer_tree_cache_append (data_in->reader_cache, result, 0);
1075
1076   return result;
1077 }