Initial check-in of gcc 4.7.2.

Change-Id: I4a2f5a921c21741a0e18bda986d77e5f1bef0365

1 files changed, 1639 insertions, 0 deletions

diff --git a/gcc-4.7/gcc/lto-streamer-out.c b/gcc-4.7/gcc/lto-streamer-out.c
new file mode 100644
index 000000000..054bb85be
--- /dev/null
+++ b/gcc-4.7/gcc/lto-streamer-out.c
@@ -0,0 +1,1639 @@
+/* Write the GIMPLE representation to a file stream.
+
+   Copyright 2009, 2010 Free Software Foundation, Inc.
+   Contributed by Kenneth Zadeck <zadeck@naturalbridge.com>
+   Re-implemented by Diego Novillo <dnovillo@google.com>
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "tree.h"
+#include "expr.h"
+#include "flags.h"
+#include "params.h"
+#include "input.h"
+#include "hashtab.h"
+#include "basic-block.h"
+#include "tree-flow.h"
+#include "tree-pass.h"
+#include "cgraph.h"
+#include "function.h"
+#include "ggc.h"
+#include "diagnostic-core.h"
+#include "except.h"
+#include "vec.h"
+#include "lto-symtab.h"
+#include "lto-streamer.h"
+#include "data-streamer.h"
+#include "gimple-streamer.h"
+#include "tree-streamer.h"
+#include "streamer-hooks.h"
+
+
+/* Clear the line info stored in DATA_IN.  */
+
+static void
+clear_line_info (struct output_block *ob)
+{
+  ob->current_file = NULL;
+  ob->current_line = 0;
+  ob->current_col = 0;
+}
+
+
+/* Create the output block and return it.  SECTION_TYPE is
+   LTO_section_function_body or LTO_static_initializer.  */
+
+struct output_block *
+create_output_block (enum lto_section_type section_type)
+{
+  struct output_block *ob = XCNEW (struct output_block);
+
+  ob->section_type = section_type;
+  ob->decl_state = lto_get_out_decl_state ();
+  ob->main_stream = XCNEW (struct lto_output_stream);
+  ob->string_stream = XCNEW (struct lto_output_stream);
+  ob->writer_cache = streamer_tree_cache_create ();
+
+  if (section_type == LTO_section_function_body)
+    ob->cfg_stream = XCNEW (struct lto_output_stream);
+
+  clear_line_info (ob);
+
+  ob->string_hash_table = htab_create (37, hash_string_slot_node,
+				       eq_string_slot_node, NULL);
+  gcc_obstack_init (&ob->obstack);
+
+  return ob;
+}
+
+
+/* Destroy the output block OB.  */
+
+void
+destroy_output_block (struct output_block *ob)
+{
+  enum lto_section_type section_type = ob->section_type;
+
+  htab_delete (ob->string_hash_table);
+
+  free (ob->main_stream);
+  free (ob->string_stream);
+  if (section_type == LTO_section_function_body)
+    free (ob->cfg_stream);
+
+  streamer_tree_cache_delete (ob->writer_cache);
+  obstack_free (&ob->obstack, NULL);
+
+  free (ob);
+}
+
+
+/* Look up NODE in the type table and write the index for it to OB.  */
+
+static void
+output_type_ref (struct output_block *ob, tree node)
+{
+  streamer_write_record_start (ob, LTO_type_ref);
+  lto_output_type_ref_index (ob->decl_state, ob->main_stream, node);
+}
+
+
+/* Return true if tree node T is written to various tables.  For these
+   nodes, we sometimes want to write their phyiscal representation
+   (via lto_output_tree), and sometimes we need to emit an index
+   reference into a table (via lto_output_tree_ref).  */
+
+static bool
+tree_is_indexable (tree t)
+{
+  if (TREE_CODE (t) == PARM_DECL)
+    return false;
+  else if (TREE_CODE (t) == VAR_DECL && decl_function_context (t)
+	   && !TREE_STATIC (t))
+    return false;
+  /* Variably modified types need to be streamed alongside function
+     bodies because they can refer to local entities.  Together with
+     them we have to localize their members as well.
+     ???  In theory that includes non-FIELD_DECLs as well.  */
+  else if (TYPE_P (t)
+	   && variably_modified_type_p (t, NULL_TREE))
+    return false;
+  else if (TREE_CODE (t) == FIELD_DECL
+	   && variably_modified_type_p (DECL_CONTEXT (t), NULL_TREE))
+    return false;
+  else
+    return (TYPE_P (t) || DECL_P (t) || TREE_CODE (t) == SSA_NAME);
+}
+
+
+/* Output info about new location into bitpack BP.
+   After outputting bitpack, lto_output_location_data has
+   to be done to output actual data.  */
+
+static inline void
+lto_output_location_bitpack (struct bitpack_d *bp,
+			     struct output_block *ob,
+			     location_t loc)
+{
+  expanded_location xloc;
+
+  bp_pack_value (bp, loc == UNKNOWN_LOCATION, 1);
+  if (loc == UNKNOWN_LOCATION)
+    return;
+
+  xloc = expand_location (loc);
+
+  bp_pack_value (bp, ob->current_file != xloc.file, 1);
+  if (ob->current_file != xloc.file)
+    bp_pack_var_len_unsigned (bp,
+	                      streamer_string_index (ob, xloc.file,
+						     strlen (xloc.file) + 1,
+						     true));
+  ob->current_file = xloc.file;
+
+  bp_pack_value (bp, ob->current_line != xloc.line, 1);
+  if (ob->current_line != xloc.line)
+    bp_pack_var_len_unsigned (bp, xloc.line);
+  ob->current_line = xloc.line;
+
+  bp_pack_value (bp, ob->current_col != xloc.column, 1);
+  if (ob->current_col != xloc.column)
+    bp_pack_var_len_unsigned (bp, xloc.column);
+  ob->current_col = xloc.column;
+}
+
+
+/* Emit location LOC to output block OB.
+   If the output_location streamer hook exists, call it.
+   Otherwise, when bitpack is handy, it is more space efficient to call
+   lto_output_location_bitpack with existing bitpack.  */
+
+void
+lto_output_location (struct output_block *ob, location_t loc)
+{
+  if (streamer_hooks.output_location)
+    streamer_hooks.output_location (ob, loc);
+  else
+    {
+      struct bitpack_d bp = bitpack_create (ob->main_stream);
+      lto_output_location_bitpack (&bp, ob, loc);
+      streamer_write_bitpack (&bp);
+    }
+}
+
+
+/* If EXPR is an indexable tree node, output a reference to it to
+   output block OB.  Otherwise, output the physical representation of
+   EXPR to OB.  */
+
+static void
+lto_output_tree_ref (struct output_block *ob, tree expr)
+{
+  enum tree_code code;
+
+  if (TYPE_P (expr))
+    {
+      output_type_ref (ob, expr);
+      return;
+    }
+
+  code = TREE_CODE (expr);
+  switch (code)
+    {
+    case SSA_NAME:
+      streamer_write_record_start (ob, LTO_ssa_name_ref);
+      streamer_write_uhwi (ob, SSA_NAME_VERSION (expr));
+      break;
+
+    case FIELD_DECL:
+      streamer_write_record_start (ob, LTO_field_decl_ref);
+      lto_output_field_decl_index (ob->decl_state, ob->main_stream, expr);
+      break;
+
+    case FUNCTION_DECL:
+      streamer_write_record_start (ob, LTO_function_decl_ref);
+      lto_output_fn_decl_index (ob->decl_state, ob->main_stream, expr);
+      break;
+
+    case VAR_DECL:
+    case DEBUG_EXPR_DECL:
+      gcc_assert (decl_function_context (expr) == NULL || TREE_STATIC (expr));
+      streamer_write_record_start (ob, LTO_global_decl_ref);
+      lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr);
+      break;
+
+    case CONST_DECL:
+      streamer_write_record_start (ob, LTO_const_decl_ref);
+      lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr);
+      break;
+
+    case IMPORTED_DECL:
+      gcc_assert (decl_function_context (expr) == NULL);
+      streamer_write_record_start (ob, LTO_imported_decl_ref);
+      lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr);
+      break;
+
+    case TYPE_DECL:
+      streamer_write_record_start (ob, LTO_type_decl_ref);
+      lto_output_type_decl_index (ob->decl_state, ob->main_stream, expr);
+      break;
+
+    case NAMESPACE_DECL:
+      streamer_write_record_start (ob, LTO_namespace_decl_ref);
+      lto_output_namespace_decl_index (ob->decl_state, ob->main_stream, expr);
+      break;
+
+    case LABEL_DECL:
+      streamer_write_record_start (ob, LTO_label_decl_ref);
+      lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr);
+      break;
+
+    case RESULT_DECL:
+      streamer_write_record_start (ob, LTO_result_decl_ref);
+      lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr);
+      break;
+
+    case TRANSLATION_UNIT_DECL:
+      streamer_write_record_start (ob, LTO_translation_unit_decl_ref);
+      lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr);
+      break;
+
+    default:
+      /* No other node is indexable, so it should have been handled by
+	 lto_output_tree.  */
+      gcc_unreachable ();
+    }
+}
+
+
+/* Return true if EXPR is a tree node that can be written to disk.  */
+
+static inline bool
+lto_is_streamable (tree expr)
+{
+  enum tree_code code = TREE_CODE (expr);
+
+  /* Notice that we reject SSA_NAMEs as well.  We only emit the SSA
+     name version in lto_output_tree_ref (see output_ssa_names).  */
+  return !is_lang_specific (expr)
+	 && code != SSA_NAME
+	 && code != CALL_EXPR
+	 && code != LANG_TYPE
+	 && code != MODIFY_EXPR
+	 && code != INIT_EXPR
+	 && code != TARGET_EXPR
+	 && code != BIND_EXPR
+	 && code != WITH_CLEANUP_EXPR
+	 && code != STATEMENT_LIST
+	 && code != OMP_CLAUSE
+	 && (code == CASE_LABEL_EXPR
+	     || code == DECL_EXPR
+	     || TREE_CODE_CLASS (code) != tcc_statement);
+}
+
+
+/* Write a physical representation of tree node EXPR to output block
+   OB.  If REF_P is true, the leaves of EXPR are emitted as references
+   via lto_output_tree_ref.  IX is the index into the streamer cache
+   where EXPR is stored.  */
+
+static void
+lto_write_tree (struct output_block *ob, tree expr, bool ref_p)
+{
+  struct bitpack_d bp;
+
+  if (!lto_is_streamable (expr))
+    internal_error ("tree code %qs is not supported in LTO streams",
+	            tree_code_name[TREE_CODE (expr)]);
+
+  /* Write the header, containing everything needed to materialize
+     EXPR on the reading side.  */
+  streamer_write_tree_header (ob, expr);
+
+  /* Pack all the non-pointer fields in EXPR into a bitpack and write
+     the resulting bitpack.  */
+  bp = bitpack_create (ob->main_stream);
+  streamer_pack_tree_bitfields (&bp, expr);
+  streamer_write_bitpack (&bp);
+
+  /* Write all the pointer fields in EXPR.  */
+  streamer_write_tree_body (ob, expr, ref_p);
+
+  /* Write any LTO-specific data to OB.  */
+  if (DECL_P (expr)
+      && TREE_CODE (expr) != FUNCTION_DECL
+      && TREE_CODE (expr) != TRANSLATION_UNIT_DECL)
+    {
+      /* Handle DECL_INITIAL for symbols.  */
+      tree initial = DECL_INITIAL (expr);
+      if (TREE_CODE (expr) == VAR_DECL
+	  && (TREE_STATIC (expr) || DECL_EXTERNAL (expr))
+	  && initial)
+	{
+	  lto_varpool_encoder_t varpool_encoder;
+	  struct varpool_node *vnode;
+
+	  varpool_encoder = ob->decl_state->varpool_node_encoder;
+	  vnode = varpool_get_node (expr);
+	  if (!vnode)
+	    initial = error_mark_node;
+	  else if (!lto_varpool_encoder_encode_initializer_p (varpool_encoder,
+							      vnode))
+	    initial = NULL;
+	}
+
+      stream_write_tree (ob, initial, ref_p);
+    }
+
+  /* Mark the end of EXPR.  */
+  streamer_write_zero (ob);
+}
+
+
+/* Emit the physical representation of tree node EXPR to output block
+   OB.  If THIS_REF_P is true, the leaves of EXPR are emitted as references
+   via lto_output_tree_ref.  REF_P is used for streaming siblings of EXPR.  */
+
+void
+lto_output_tree (struct output_block *ob, tree expr,
+		 bool ref_p, bool this_ref_p)
+{
+  unsigned ix;
+  bool existed_p;
+
+  if (expr == NULL_TREE)
+    {
+      streamer_write_record_start (ob, LTO_null);
+      return;
+    }
+
+  if (this_ref_p && tree_is_indexable (expr))
+    {
+      lto_output_tree_ref (ob, expr);
+      return;
+    }
+
+  /* INTEGER_CST nodes are special because they need their original type
+     to be materialized by the reader (to implement TYPE_CACHED_VALUES).  */
+  if (TREE_CODE (expr) == INTEGER_CST)
+    {
+      streamer_write_integer_cst (ob, expr, ref_p);
+      return;
+    }
+
+  existed_p = streamer_tree_cache_insert (ob->writer_cache, expr, &ix);
+  if (existed_p)
+    {
+      /* If a node has already been streamed out, make sure that
+	 we don't write it more than once.  Otherwise, the reader
+	 will instantiate two different nodes for the same object.  */
+      streamer_write_record_start (ob, LTO_tree_pickle_reference);
+      streamer_write_uhwi (ob, ix);
+      streamer_write_enum (ob->main_stream, LTO_tags, LTO_NUM_TAGS,
+			   lto_tree_code_to_tag (TREE_CODE (expr)));
+    }
+  else if (streamer_handle_as_builtin_p (expr))
+    {
+      /* MD and NORMAL builtins do not need to be written out
+	 completely as they are always instantiated by the
+	 compiler on startup.  The only builtins that need to
+	 be written out are BUILT_IN_FRONTEND.  For all other
+	 builtins, we simply write the class and code.  */
+      streamer_write_builtin (ob, expr);
+    }
+  else
+    {
+      /* This is the first time we see EXPR, write its fields
+	 to OB.  */
+      lto_write_tree (ob, expr, ref_p);
+    }
+}
+
+
+/* Output to OB a list of try/catch handlers starting with FIRST.  */
+
+static void
+output_eh_try_list (struct output_block *ob, eh_catch first)
+{
+  eh_catch n;
+
+  for (n = first; n; n = n->next_catch)
+    {
+      streamer_write_record_start (ob, LTO_eh_catch);
+      stream_write_tree (ob, n->type_list, true);
+      stream_write_tree (ob, n->filter_list, true);
+      stream_write_tree (ob, n->label, true);
+    }
+
+  streamer_write_record_start (ob, LTO_null);
+}
+
+
+/* Output EH region R in function FN to OB.  CURR_RN is the slot index
+   that is being emitted in FN->EH->REGION_ARRAY.  This is used to
+   detect EH region sharing.  */
+
+static void
+output_eh_region (struct output_block *ob, eh_region r)
+{
+  enum LTO_tags tag;
+
+  if (r == NULL)
+    {
+      streamer_write_record_start (ob, LTO_null);
+      return;
+    }
+
+  if (r->type == ERT_CLEANUP)
+    tag = LTO_ert_cleanup;
+  else if (r->type == ERT_TRY)
+    tag = LTO_ert_try;
+  else if (r->type == ERT_ALLOWED_EXCEPTIONS)
+    tag = LTO_ert_allowed_exceptions;
+  else if (r->type == ERT_MUST_NOT_THROW)
+    tag = LTO_ert_must_not_throw;
+  else
+    gcc_unreachable ();
+
+  streamer_write_record_start (ob, tag);
+  streamer_write_hwi (ob, r->index);
+
+  if (r->outer)
+    streamer_write_hwi (ob, r->outer->index);
+  else
+    streamer_write_zero (ob);
+
+  if (r->inner)
+    streamer_write_hwi (ob, r->inner->index);
+  else
+    streamer_write_zero (ob);
+
+  if (r->next_peer)
+    streamer_write_hwi (ob, r->next_peer->index);
+  else
+    streamer_write_zero (ob);
+
+  if (r->type == ERT_TRY)
+    {
+      output_eh_try_list (ob, r->u.eh_try.first_catch);
+    }
+  else if (r->type == ERT_ALLOWED_EXCEPTIONS)
+    {
+      stream_write_tree (ob, r->u.allowed.type_list, true);
+      stream_write_tree (ob, r->u.allowed.label, true);
+      streamer_write_uhwi (ob, r->u.allowed.filter);
+    }
+  else if (r->type == ERT_MUST_NOT_THROW)
+    {
+      stream_write_tree (ob, r->u.must_not_throw.failure_decl, true);
+      lto_output_location (ob, r->u.must_not_throw.failure_loc);
+    }
+
+  if (r->landing_pads)
+    streamer_write_hwi (ob, r->landing_pads->index);
+  else
+    streamer_write_zero (ob);
+}
+
+
+/* Output landing pad LP to OB.  */
+
+static void
+output_eh_lp (struct output_block *ob, eh_landing_pad lp)
+{
+  if (lp == NULL)
+    {
+      streamer_write_record_start (ob, LTO_null);
+      return;
+    }
+
+  streamer_write_record_start (ob, LTO_eh_landing_pad);
+  streamer_write_hwi (ob, lp->index);
+  if (lp->next_lp)
+    streamer_write_hwi (ob, lp->next_lp->index);
+  else
+    streamer_write_zero (ob);
+
+  if (lp->region)
+    streamer_write_hwi (ob, lp->region->index);
+  else
+    streamer_write_zero (ob);
+
+  stream_write_tree (ob, lp->post_landing_pad, true);
+}
+
+
+/* Output the existing eh_table to OB.  */
+
+static void
+output_eh_regions (struct output_block *ob, struct function *fn)
+{
+  if (fn->eh && fn->eh->region_tree)
+    {
+      unsigned i;
+      eh_region eh;
+      eh_landing_pad lp;
+      tree ttype;
+
+      streamer_write_record_start (ob, LTO_eh_table);
+
+      /* Emit the index of the root of the EH region tree.  */
+      streamer_write_hwi (ob, fn->eh->region_tree->index);
+
+      /* Emit all the EH regions in the region array.  */
+      streamer_write_hwi (ob, VEC_length (eh_region, fn->eh->region_array));
+      FOR_EACH_VEC_ELT (eh_region, fn->eh->region_array, i, eh)
+	output_eh_region (ob, eh);
+
+      /* Emit all landing pads.  */
+      streamer_write_hwi (ob, VEC_length (eh_landing_pad, fn->eh->lp_array));
+      FOR_EACH_VEC_ELT (eh_landing_pad, fn->eh->lp_array, i, lp)
+	output_eh_lp (ob, lp);
+
+      /* Emit all the runtime type data.  */
+      streamer_write_hwi (ob, VEC_length (tree, fn->eh->ttype_data));
+      FOR_EACH_VEC_ELT (tree, fn->eh->ttype_data, i, ttype)
+	stream_write_tree (ob, ttype, true);
+
+      /* Emit the table of action chains.  */
+      if (targetm.arm_eabi_unwinder)
+	{
+	  tree t;
+	  streamer_write_hwi (ob, VEC_length (tree,
+				              fn->eh->ehspec_data.arm_eabi));
+	  FOR_EACH_VEC_ELT (tree, fn->eh->ehspec_data.arm_eabi, i, t)
+	    stream_write_tree (ob, t, true);
+	}
+      else
+	{
+	  uchar c;
+	  streamer_write_hwi (ob, VEC_length (uchar,
+				              fn->eh->ehspec_data.other));
+	  FOR_EACH_VEC_ELT (uchar, fn->eh->ehspec_data.other, i, c)
+	    streamer_write_char_stream (ob->main_stream, c);
+	}
+    }
+
+  /* The LTO_null either terminates the record or indicates that there
+     are no eh_records at all.  */
+  streamer_write_record_start (ob, LTO_null);
+}
+
+
+/* Output all of the active ssa names to the ssa_names stream.  */
+
+static void
+output_ssa_names (struct output_block *ob, struct function *fn)
+{
+  unsigned int i, len;
+
+  len = VEC_length (tree, SSANAMES (fn));
+  streamer_write_uhwi (ob, len);
+
+  for (i = 1; i < len; i++)
+    {
+      tree ptr = VEC_index (tree, SSANAMES (fn), i);
+
+      if (ptr == NULL_TREE
+	  || SSA_NAME_IN_FREE_LIST (ptr)
+	  || !is_gimple_reg (ptr))
+	continue;
+
+      streamer_write_uhwi (ob, i);
+      streamer_write_char_stream (ob->main_stream,
+				  SSA_NAME_IS_DEFAULT_DEF (ptr));
+      stream_write_tree (ob, SSA_NAME_VAR (ptr), true);
+    }
+
+  streamer_write_zero (ob);
+}
+
+
+/* Output the cfg.  */
+
+static void
+output_cfg (struct output_block *ob, struct function *fn)
+{
+  struct lto_output_stream *tmp_stream = ob->main_stream;
+  basic_block bb;
+
+  ob->main_stream = ob->cfg_stream;
+
+  streamer_write_enum (ob->main_stream, profile_status_d, PROFILE_LAST,
+		       profile_status_for_function (fn));
+
+  /* Output the number of the highest basic block.  */
+  streamer_write_uhwi (ob, last_basic_block_for_function (fn));
+
+  FOR_ALL_BB_FN (bb, fn)
+    {
+      edge_iterator ei;
+      edge e;
+
+      streamer_write_hwi (ob, bb->index);
+
+      /* Output the successors and the edge flags.  */
+      streamer_write_uhwi (ob, EDGE_COUNT (bb->succs));
+      FOR_EACH_EDGE (e, ei, bb->succs)
+	{
+	  streamer_write_uhwi (ob, e->dest->index);
+	  streamer_write_hwi (ob, e->probability);
+	  streamer_write_hwi (ob, e->count);
+	  streamer_write_uhwi (ob, e->flags);
+	}
+    }
+
+  streamer_write_hwi (ob, -1);
+
+  bb = ENTRY_BLOCK_PTR;
+  while (bb->next_bb)
+    {
+      streamer_write_hwi (ob, bb->next_bb->index);
+      bb = bb->next_bb;
+    }
+
+  streamer_write_hwi (ob, -1);
+
+  ob->main_stream = tmp_stream;
+}
+
+
+/* Create the header in the file using OB.  If the section type is for
+   a function, set FN to the decl for that function.  */
+
+void
+produce_asm (struct output_block *ob, tree fn)
+{
+  enum lto_section_type section_type = ob->section_type;
+  struct lto_function_header header;
+  char *section_name;
+  struct lto_output_stream *header_stream;
+
+  if (section_type == LTO_section_function_body)
+    {
+      const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fn));
+      section_name = lto_get_section_name (section_type, name, NULL);
+    }
+  else
+    section_name = lto_get_section_name (section_type, NULL, NULL);
+
+  lto_begin_section (section_name, !flag_wpa);
+  free (section_name);
+
+  /* The entire header is stream computed here.  */
+  memset (&header, 0, sizeof (struct lto_function_header));
+
+  /* Write the header.  */
+  header.lto_header.major_version = LTO_major_version;
+  header.lto_header.minor_version = LTO_minor_version;
+  header.lto_header.section_type = section_type;
+
+  header.compressed_size = 0;
+
+  if (section_type == LTO_section_function_body)
+    header.cfg_size = ob->cfg_stream->total_size;
+  header.main_size = ob->main_stream->total_size;
+  header.string_size = ob->string_stream->total_size;
+
+  header_stream = XCNEW (struct lto_output_stream);
+  lto_output_data_stream (header_stream, &header, sizeof header);
+  lto_write_stream (header_stream);
+  free (header_stream);
+
+  /* Put all of the gimple and the string table out the asm file as a
+     block of text.  */
+  if (section_type == LTO_section_function_body)
+    lto_write_stream (ob->cfg_stream);
+  lto_write_stream (ob->main_stream);
+  lto_write_stream (ob->string_stream);
+
+  lto_end_section ();
+}
+
+
+/* Output the base body of struct function FN using output block OB.  */
+
+static void
+output_struct_function_base (struct output_block *ob, struct function *fn)
+{
+  struct bitpack_d bp;
+  unsigned i;
+  tree t;
+
+  /* Output the static chain and non-local goto save area.  */
+  stream_write_tree (ob, fn->static_chain_decl, true);
+  stream_write_tree (ob, fn->nonlocal_goto_save_area, true);
+
+  /* Output all the local variables in the function.  */
+  streamer_write_hwi (ob, VEC_length (tree, fn->local_decls));
+  FOR_EACH_VEC_ELT (tree, fn->local_decls, i, t)
+    stream_write_tree (ob, t, true);
+
+  /* Output the function start and end loci.  */
+  lto_output_location (ob, fn->function_start_locus);
+  lto_output_location (ob, fn->function_end_locus);
+
+  /* Output current IL state of the function.  */
+  streamer_write_uhwi (ob, fn->curr_properties);
+
+  /* Write all the attributes for FN.  */
+  bp = bitpack_create (ob->main_stream);
+  bp_pack_value (&bp, fn->is_thunk, 1);
+  bp_pack_value (&bp, fn->has_local_explicit_reg_vars, 1);
+  bp_pack_value (&bp, fn->after_tree_profile, 1);
+  bp_pack_value (&bp, fn->returns_pcc_struct, 1);
+  bp_pack_value (&bp, fn->returns_struct, 1);
+  bp_pack_value (&bp, fn->can_throw_non_call_exceptions, 1);
+  bp_pack_value (&bp, fn->always_inline_functions_inlined, 1);
+  bp_pack_value (&bp, fn->after_inlining, 1);
+  bp_pack_value (&bp, fn->stdarg, 1);
+  bp_pack_value (&bp, fn->has_nonlocal_label, 1);
+  bp_pack_value (&bp, fn->calls_alloca, 1);
+  bp_pack_value (&bp, fn->calls_setjmp, 1);
+  bp_pack_value (&bp, fn->va_list_fpr_size, 8);
+  bp_pack_value (&bp, fn->va_list_gpr_size, 8);
+  streamer_write_bitpack (&bp);
+}
+
+
+/* Output the body of function NODE->DECL.  */
+
+static void
+output_function (struct cgraph_node *node)
+{
+  tree function;
+  struct function *fn;
+  basic_block bb;
+  struct output_block *ob;
+
+  function = node->decl;
+  fn = DECL_STRUCT_FUNCTION (function);
+  ob = create_output_block (LTO_section_function_body);
+
+  clear_line_info (ob);
+  ob->cgraph_node = node;
+
+  gcc_assert (current_function_decl == NULL_TREE && cfun == NULL);
+
+  /* Set current_function_decl and cfun.  */
+  current_function_decl = function;
+  push_cfun (fn);
+
+  /* Make string 0 be a NULL string.  */
+  streamer_write_char_stream (ob->string_stream, 0);
+
+  streamer_write_record_start (ob, LTO_function);
+
+  output_struct_function_base (ob, fn);
+
+  /* Output the head of the arguments list.  */
+  stream_write_tree (ob, DECL_ARGUMENTS (function), true);
+
+  /* Output all the SSA names used in the function.  */
+  output_ssa_names (ob, fn);
+
+  /* Output any exception handling regions.  */
+  output_eh_regions (ob, fn);
+
+  /* Output DECL_INITIAL for the function, which contains the tree of
+     lexical scopes.  */
+  stream_write_tree (ob, DECL_INITIAL (function), true);
+
+  /* We will renumber the statements.  The code that does this uses
+     the same ordering that we use for serializing them so we can use
+     the same code on the other end and not have to write out the
+     statement numbers.  We do not assign UIDs to PHIs here because
+     virtual PHIs get re-computed on-the-fly which would make numbers
+     inconsistent.  */
+  set_gimple_stmt_max_uid (cfun, 0);
+  FOR_ALL_BB (bb)
+    {
+      gimple_stmt_iterator gsi;
+      for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
+	{
+	  gimple stmt = gsi_stmt (gsi);
+	  gimple_set_uid (stmt, inc_gimple_stmt_max_uid (cfun));
+	}
+    }
+
+  /* Output the code for the function.  */
+  FOR_ALL_BB_FN (bb, fn)
+    output_bb (ob, bb, fn);
+
+  /* The terminator for this function.  */
+  streamer_write_record_start (ob, LTO_null);
+
+  output_cfg (ob, fn);
+
+  /* Create a section to hold the pickled output of this function.   */
+  produce_asm (ob, function);
+
+  destroy_output_block (ob);
+
+  current_function_decl = NULL;
+  pop_cfun ();
+}
+
+
+/* Used to pass data to trivally_defined_alias callback.  */
+struct sets {
+  cgraph_node_set set;
+  varpool_node_set vset;
+};
+
+
+/* Return true if alias pair P belongs to the set of cgraph nodes in
+   SET.  If P is a an alias for a VAR_DECL, it can always be emitted.
+   However, for FUNCTION_DECL aliases, we should only output the pair
+   if it belongs to a function whose cgraph node is in SET.
+   Otherwise, the LTRANS phase will get into trouble when finalizing
+   aliases because the alias will refer to a function not defined in
+   the file processed by LTRANS.  */
+
+static bool
+trivally_defined_alias (tree decl ATTRIBUTE_UNUSED,
+			tree target, void *data)
+{
+  struct sets *set = (struct sets *) data;
+  struct cgraph_node *fnode = NULL;
+  struct varpool_node *vnode = NULL;
+
+  fnode = cgraph_node_for_asm (target);
+  if (fnode)
+    return cgraph_node_in_set_p (fnode, set->set);
+  vnode = varpool_node_for_asm (target);
+  return vnode && varpool_node_in_set_p (vnode, set->vset);
+}
+
+/* Return true if alias pair P should be output in the current
+   partition contains cgrpah nodes SET and varpool nodes VSET.
+   DEFINED is set of all aliases whose targets are defined in
+   the partition.
+
+   Normal aliases are output when they are defined, while WEAKREF
+   aliases are output when they are used.  */
+
+static bool
+output_alias_pair_p (alias_pair *p, symbol_alias_set_t *defined,
+		     cgraph_node_set set, varpool_node_set vset)
+{
+  struct cgraph_node *node;
+  struct varpool_node *vnode;
+
+  if (lookup_attribute ("weakref", DECL_ATTRIBUTES (p->decl)))
+    {
+      if (TREE_CODE (p->decl) == VAR_DECL)
+	{
+	  vnode = varpool_get_node (p->decl);
+	  return (vnode
+		  && referenced_from_this_partition_p (&vnode->ref_list, set, vset));
+	}
+      node = cgraph_get_node (p->decl);
+      return (node
+	      && (referenced_from_this_partition_p (&node->ref_list, set, vset)
+		  || reachable_from_this_partition_p (node, set)));
+    }
+  else
+    return symbol_alias_set_contains (defined, p->decl);
+}
+
+/* Output any unreferenced global symbol defined in SET, alias pairs
+   and labels.  */
+
+static void
+output_unreferenced_globals (cgraph_node_set set, varpool_node_set vset)
+{
+  struct output_block *ob;
+  alias_pair *p;
+  unsigned i;
+  symbol_alias_set_t *defined;
+  struct sets setdata;
+
+  setdata.set = set;
+  setdata.vset = vset;
+
+  ob = create_output_block (LTO_section_static_initializer);
+  ob->cgraph_node = NULL;
+
+  clear_line_info (ob);
+
+  /* Make string 0 be a NULL string.  */
+  streamer_write_char_stream (ob->string_stream, 0);
+
+  /* We really need to propagate in both directoins:
+     for normal aliases we propagate from first defined alias to
+     all aliases defined based on it.  For weakrefs we propagate in
+     the oposite direction.  */
+  defined = propagate_aliases_backward (trivally_defined_alias, &setdata);
+
+  /* Emit the alias pairs for the nodes in SET.  */
+  FOR_EACH_VEC_ELT (alias_pair, alias_pairs, i, p)
+    if (output_alias_pair_p (p, defined, set, vset))
+      {
+	stream_write_tree (ob, p->decl, true);
+	stream_write_tree (ob, p->target, true);
+      }
+  symbol_alias_set_destroy (defined);
+
+  streamer_write_record_start (ob, LTO_null);
+
+  produce_asm (ob, NULL);
+  destroy_output_block (ob);
+}
+
+
+/* Emit toplevel asms.  */
+
+void
+lto_output_toplevel_asms (void)
+{
+  struct output_block *ob;
+  struct cgraph_asm_node *can;
+  char *section_name;
+  struct lto_output_stream *header_stream;
+  struct lto_asm_header header;
+
+  if (! cgraph_asm_nodes)
+    return;
+
+  ob = create_output_block (LTO_section_asm);
+
+  /* Make string 0 be a NULL string.  */
+  streamer_write_char_stream (ob->string_stream, 0);
+
+  for (can = cgraph_asm_nodes; can; can = can->next)
+    {
+      streamer_write_string_cst (ob, ob->main_stream, can->asm_str);
+      streamer_write_hwi (ob, can->order);
+    }
+
+  streamer_write_string_cst (ob, ob->main_stream, NULL_TREE);
+
+  section_name = lto_get_section_name (LTO_section_asm, NULL, NULL);
+  lto_begin_section (section_name, !flag_wpa);
+  free (section_name);
+
+  /* The entire header stream is computed here.  */
+  memset (&header, 0, sizeof (header));
+
+  /* Write the header.  */
+  header.lto_header.major_version = LTO_major_version;
+  header.lto_header.minor_version = LTO_minor_version;
+  header.lto_header.section_type = LTO_section_asm;
+
+  header.main_size = ob->main_stream->total_size;
+  header.string_size = ob->string_stream->total_size;
+
+  header_stream = XCNEW (struct lto_output_stream);
+  lto_output_data_stream (header_stream, &header, sizeof (header));
+  lto_write_stream (header_stream);
+  free (header_stream);
+
+  /* Put all of the gimple and the string table out the asm file as a
+     block of text.  */
+  lto_write_stream (ob->main_stream);
+  lto_write_stream (ob->string_stream);
+
+  lto_end_section ();
+
+  destroy_output_block (ob);
+}
+
+
+/* Copy the function body of NODE without deserializing. */
+
+static void
+copy_function (struct cgraph_node *node)
+{
+  tree function = node->decl;
+  struct lto_file_decl_data *file_data = node->local.lto_file_data;
+  struct lto_output_stream *output_stream = XCNEW (struct lto_output_stream);
+  const char *data;
+  size_t len;
+  const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (function));
+  char *section_name =
+    lto_get_section_name (LTO_section_function_body, name, NULL);
+  size_t i, j;
+  struct lto_in_decl_state *in_state;
+  struct lto_out_decl_state *out_state = lto_get_out_decl_state ();
+
+  lto_begin_section (section_name, !flag_wpa);
+  free (section_name);
+
+  /* We may have renamed the declaration, e.g., a static function.  */
+  name = lto_get_decl_name_mapping (file_data, name);
+
+  data = lto_get_section_data (file_data, LTO_section_function_body,
+                               name, &len);
+  gcc_assert (data);
+
+  /* Do a bit copy of the function body.  */
+  lto_output_data_stream (output_stream, data, len);
+  lto_write_stream (output_stream);
+
+  /* Copy decls. */
+  in_state =
+    lto_get_function_in_decl_state (node->local.lto_file_data, function);
+  gcc_assert (in_state);
+
+  for (i = 0; i < LTO_N_DECL_STREAMS; i++)
+    {
+      size_t n = in_state->streams[i].size;
+      tree *trees = in_state->streams[i].trees;
+      struct lto_tree_ref_encoder *encoder = &(out_state->streams[i]);
+
+      /* The out state must have the same indices and the in state.
+	 So just copy the vector.  All the encoders in the in state
+	 must be empty where we reach here. */
+      gcc_assert (lto_tree_ref_encoder_size (encoder) == 0);
+      for (j = 0; j < n; j++)
+	VEC_safe_push (tree, heap, encoder->trees, trees[j]);
+      encoder->next_index = n;
+    }
+
+  lto_free_section_data (file_data, LTO_section_function_body, name,
+			 data, len);
+  free (output_stream);
+  lto_end_section ();
+}
+
+
+/* Main entry point from the pass manager.  */
+
+static void
+lto_output (cgraph_node_set set, varpool_node_set vset)
+{
+  struct cgraph_node *node;
+  struct lto_out_decl_state *decl_state;
+#ifdef ENABLE_CHECKING
+  bitmap output = lto_bitmap_alloc ();
+#endif
+  int i, n_nodes;
+  lto_cgraph_encoder_t encoder = lto_get_out_decl_state ()->cgraph_node_encoder;
+
+  /* Initialize the streamer.  */
+  lto_streamer_init ();
+
+  n_nodes = lto_cgraph_encoder_size (encoder);
+  /* Process only the functions with bodies.  */
+  for (i = 0; i < n_nodes; i++)
+    {
+      node = lto_cgraph_encoder_deref (encoder, i);
+      if (lto_cgraph_encoder_encode_body_p (encoder, node)
+	  && !node->alias
+	  && !node->thunk.thunk_p)
+	{
+#ifdef ENABLE_CHECKING
+	  gcc_assert (!bitmap_bit_p (output, DECL_UID (node->decl)));
+	  bitmap_set_bit (output, DECL_UID (node->decl));
+#endif
+	  decl_state = lto_new_out_decl_state ();
+	  lto_push_out_decl_state (decl_state);
+	  if (gimple_has_body_p (node->decl))
+	    output_function (node);
+	  else
+	    copy_function (node);
+	  gcc_assert (lto_get_out_decl_state () == decl_state);
+	  lto_pop_out_decl_state ();
+	  lto_record_function_out_decl_state (node->decl, decl_state);
+	}
+    }
+
+  /* Emit the callgraph after emitting function bodies.  This needs to
+     be done now to make sure that all the statements in every function
+     have been renumbered so that edges can be associated with call
+     statements using the statement UIDs.  */
+  output_cgraph (set, vset);
+
+#ifdef ENABLE_CHECKING
+  lto_bitmap_free (output);
+#endif
+}
+
+struct ipa_opt_pass_d pass_ipa_lto_gimple_out =
+{
+ {
+  IPA_PASS,
+  "lto_gimple_out",	                /* name */
+  gate_lto_out,			        /* gate */
+  NULL,		                	/* execute */
+  NULL,					/* sub */
+  NULL,					/* next */
+  0,					/* static_pass_number */
+  TV_IPA_LTO_GIMPLE_OUT,		        /* tv_id */
+  0,	                                /* properties_required */
+  0,					/* properties_provided */
+  0,					/* properties_destroyed */
+  0,            			/* todo_flags_start */
+  0                                     /* todo_flags_finish */
+ },
+ NULL,		                        /* generate_summary */
+ lto_output,           			/* write_summary */
+ NULL,		         		/* read_summary */
+ lto_output,           			/* write_optimization_summary */
+ NULL,					/* read_optimization_summary */
+ NULL,					/* stmt_fixup */
+ 0,					/* TODOs */
+ NULL,			                /* function_transform */
+ NULL					/* variable_transform */
+};
+
+
+/* Write each node in encoded by ENCODER to OB, as well as those reachable
+   from it and required for correct representation of its semantics.
+   Each node in ENCODER must be a global declaration or a type.  A node
+   is written only once, even if it appears multiple times in the
+   vector.  Certain transitively-reachable nodes, such as those
+   representing expressions, may be duplicated, but such nodes
+   must not appear in ENCODER itself.  */
+
+static void
+write_global_stream (struct output_block *ob,
+		     struct lto_tree_ref_encoder *encoder)
+{
+  tree t;
+  size_t index;
+  const size_t size = lto_tree_ref_encoder_size (encoder);
+
+  for (index = 0; index < size; index++)
+    {
+      t = lto_tree_ref_encoder_get_tree (encoder, index);
+      if (!streamer_tree_cache_lookup (ob->writer_cache, t, NULL))
+	stream_write_tree (ob, t, false);
+    }
+}
+
+
+/* Write a sequence of indices into the globals vector corresponding
+   to the trees in ENCODER.  These are used by the reader to map the
+   indices used to refer to global entities within function bodies to
+   their referents.  */
+
+static void
+write_global_references (struct output_block *ob,
+			 struct lto_output_stream *ref_stream,
+ 			 struct lto_tree_ref_encoder *encoder)
+{
+  tree t;
+  uint32_t index;
+  const uint32_t size = lto_tree_ref_encoder_size (encoder);
+
+  /* Write size as 32-bit unsigned. */
+  lto_output_data_stream (ref_stream, &size, sizeof (int32_t));
+
+  for (index = 0; index < size; index++)
+    {
+      uint32_t slot_num;
+
+      t = lto_tree_ref_encoder_get_tree (encoder, index);
+      streamer_tree_cache_lookup (ob->writer_cache, t, &slot_num);
+      gcc_assert (slot_num != (unsigned)-1);
+      lto_output_data_stream (ref_stream, &slot_num, sizeof slot_num);
+    }
+}
+
+
+/* Write all the streams in an lto_out_decl_state STATE using
+   output block OB and output stream OUT_STREAM.  */
+
+void
+lto_output_decl_state_streams (struct output_block *ob,
+			       struct lto_out_decl_state *state)
+{
+  int i;
+
+  for (i = 0;  i < LTO_N_DECL_STREAMS; i++)
+    write_global_stream (ob, &state->streams[i]);
+}
+
+
+/* Write all the references in an lto_out_decl_state STATE using
+   output block OB and output stream OUT_STREAM.  */
+
+void
+lto_output_decl_state_refs (struct output_block *ob,
+			    struct lto_output_stream *out_stream,
+			    struct lto_out_decl_state *state)
+{
+  unsigned i;
+  uint32_t ref;
+  tree decl;
+
+  /* Write reference to FUNCTION_DECL.  If there is not function,
+     write reference to void_type_node. */
+  decl = (state->fn_decl) ? state->fn_decl : void_type_node;
+  streamer_tree_cache_lookup (ob->writer_cache, decl, &ref);
+  gcc_assert (ref != (unsigned)-1);
+  lto_output_data_stream (out_stream, &ref, sizeof (uint32_t));
+
+  for (i = 0;  i < LTO_N_DECL_STREAMS; i++)
+    write_global_references (ob, out_stream, &state->streams[i]);
+}
+
+
+/* Return the written size of STATE. */
+
+static size_t
+lto_out_decl_state_written_size (struct lto_out_decl_state *state)
+{
+  int i;
+  size_t size;
+
+  size = sizeof (int32_t);	/* fn_ref. */
+  for (i = 0; i < LTO_N_DECL_STREAMS; i++)
+    {
+      size += sizeof (int32_t); /* vector size. */
+      size += (lto_tree_ref_encoder_size (&state->streams[i])
+	       * sizeof (int32_t));
+    }
+  return size;
+}
+
+
+/* Write symbol T into STREAM in CACHE. SEEN specifies symbols we wrote
+   so far.  */
+
+static void
+write_symbol (struct streamer_tree_cache_d *cache,
+	      struct lto_output_stream *stream,
+	      tree t, struct pointer_set_t *seen, bool alias)
+{
+  const char *name;
+  enum gcc_plugin_symbol_kind kind;
+  enum gcc_plugin_symbol_visibility visibility;
+  unsigned slot_num;
+  unsigned HOST_WIDEST_INT size;
+  const char *comdat;
+  unsigned char c;
+
+  /* None of the following kinds of symbols are needed in the
+     symbol table.  */
+  if (!TREE_PUBLIC (t)
+      || is_builtin_fn (t)
+      || DECL_ABSTRACT (t)
+      || TREE_CODE (t) == RESULT_DECL)
+    return;
+
+  gcc_assert (TREE_CODE (t) == VAR_DECL
+	      || TREE_CODE (t) == FUNCTION_DECL);
+
+  name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (t));
+
+  /* This behaves like assemble_name_raw in varasm.c, performing the
+     same name manipulations that ASM_OUTPUT_LABELREF does. */
+  name = IDENTIFIER_POINTER ((*targetm.asm_out.mangle_assembler_name) (name));
+
+  if (pointer_set_contains (seen, name))
+    return;
+  pointer_set_insert (seen, name);
+
+  streamer_tree_cache_lookup (cache, t, &slot_num);
+  gcc_assert (slot_num != (unsigned)-1);
+
+  if (DECL_EXTERNAL (t))
+    {
+      if (DECL_WEAK (t))
+	kind = GCCPK_WEAKUNDEF;
+      else
+	kind = GCCPK_UNDEF;
+    }
+  else
+    {
+      if (DECL_WEAK (t))
+	kind = GCCPK_WEAKDEF;
+      else if (DECL_COMMON (t))
+	kind = GCCPK_COMMON;
+      else
+	kind = GCCPK_DEF;
+
+      /* When something is defined, it should have node attached.  */
+      gcc_assert (alias || TREE_CODE (t) != VAR_DECL
+		  || varpool_get_node (t)->finalized);
+      gcc_assert (alias || TREE_CODE (t) != FUNCTION_DECL
+		  || (cgraph_get_node (t)
+		      && cgraph_get_node (t)->analyzed));
+    }
+
+  /* Imitate what default_elf_asm_output_external do.
+     When symbol is external, we need to output it with DEFAULT visibility
+     when compiling with -fvisibility=default, while with HIDDEN visibility
+     when symbol has attribute (visibility("hidden")) specified.
+     targetm.binds_local_p check DECL_VISIBILITY_SPECIFIED and gets this
+     right. */
+
+  if (DECL_EXTERNAL (t)
+      && !targetm.binds_local_p (t))
+    visibility = GCCPV_DEFAULT;
+  else
+    switch (DECL_VISIBILITY(t))
+      {
+      case VISIBILITY_DEFAULT:
+	visibility = GCCPV_DEFAULT;
+	break;
+      case VISIBILITY_PROTECTED:
+	visibility = GCCPV_PROTECTED;
+	break;
+      case VISIBILITY_HIDDEN:
+	visibility = GCCPV_HIDDEN;
+	break;
+      case VISIBILITY_INTERNAL:
+	visibility = GCCPV_INTERNAL;
+	break;
+      }
+
+  if (kind == GCCPK_COMMON
+      && DECL_SIZE_UNIT (t)
+      && TREE_CODE (DECL_SIZE_UNIT (t)) == INTEGER_CST)
+    size = TREE_INT_CST_LOW (DECL_SIZE_UNIT (t));
+  else
+    size = 0;
+
+  if (DECL_ONE_ONLY (t))
+    comdat = IDENTIFIER_POINTER (DECL_COMDAT_GROUP (t));
+  else
+    comdat = "";
+
+  lto_output_data_stream (stream, name, strlen (name) + 1);
+  lto_output_data_stream (stream, comdat, strlen (comdat) + 1);
+  c = (unsigned char) kind;
+  lto_output_data_stream (stream, &c, 1);
+  c = (unsigned char) visibility;
+  lto_output_data_stream (stream, &c, 1);
+  lto_output_data_stream (stream, &size, 8);
+  lto_output_data_stream (stream, &slot_num, 4);
+}
+
+
+/* Write an IL symbol table to OB.
+   SET and VSET are cgraph/varpool node sets we are outputting.  */
+
+static void
+produce_symtab (struct output_block *ob,
+	        cgraph_node_set set, varpool_node_set vset)
+{
+  struct streamer_tree_cache_d *cache = ob->writer_cache;
+  char *section_name = lto_get_section_name (LTO_section_symtab, NULL, NULL);
+  struct pointer_set_t *seen;
+  struct cgraph_node *node;
+  struct varpool_node *vnode;
+  struct lto_output_stream stream;
+  lto_varpool_encoder_t varpool_encoder = ob->decl_state->varpool_node_encoder;
+  lto_cgraph_encoder_t encoder = ob->decl_state->cgraph_node_encoder;
+  int i;
+  alias_pair *p;
+  struct sets setdata;
+  symbol_alias_set_t *defined;
+
+  setdata.set = set;
+  setdata.vset = vset;
+
+  lto_begin_section (section_name, false);
+  free (section_name);
+
+  seen = pointer_set_create ();
+  memset (&stream, 0, sizeof (stream));
+
+  /* Write all functions. 
+     First write all defined functions and then write all used functions.
+     This is done so only to handle duplicated symbols in cgraph.  */
+  for (i = 0; i < lto_cgraph_encoder_size (encoder); i++)
+    {
+      node = lto_cgraph_encoder_deref (encoder, i);
+      if (DECL_EXTERNAL (node->decl))
+	continue;
+      if (DECL_COMDAT (node->decl)
+	  && cgraph_comdat_can_be_unshared_p (node))
+	continue;
+      if ((node->alias && !node->thunk.alias) || node->global.inlined_to)
+	continue;
+      write_symbol (cache, &stream, node->decl, seen, false);
+    }
+  for (i = 0; i < lto_cgraph_encoder_size (encoder); i++)
+    {
+      node = lto_cgraph_encoder_deref (encoder, i);
+      if (!DECL_EXTERNAL (node->decl))
+	continue;
+      /* We keep around unused extern inlines in order to be able to inline
+	 them indirectly or via vtables.  Do not output them to symbol
+	 table: they end up being undefined and just consume space.  */
+      if (!node->address_taken && !node->callers)
+	continue;
+      if (DECL_COMDAT (node->decl)
+	  && cgraph_comdat_can_be_unshared_p (node))
+	continue;
+      if ((node->alias && !node->thunk.alias) || node->global.inlined_to)
+	continue;
+      write_symbol (cache, &stream, node->decl, seen, false);
+    }
+
+  /* Write all variables.  */
+  for (i = 0; i < lto_varpool_encoder_size (varpool_encoder); i++)
+    {
+      vnode = lto_varpool_encoder_deref (varpool_encoder, i);
+      if (DECL_EXTERNAL (vnode->decl))
+	continue;
+      /* COMDAT virtual tables can be unshared.  Do not declare them
+	 in the LTO symbol table to prevent linker from forcing them
+	 into the output. */
+      if (DECL_COMDAT (vnode->decl)
+	  && !vnode->force_output
+	  && vnode->finalized 
+	  && DECL_VIRTUAL_P (vnode->decl))
+	continue;
+      if (vnode->alias && !vnode->alias_of)
+	continue;
+      write_symbol (cache, &stream, vnode->decl, seen, false);
+    }
+  for (i = 0; i < lto_varpool_encoder_size (varpool_encoder); i++)
+    {
+      vnode = lto_varpool_encoder_deref (varpool_encoder, i);
+      if (!DECL_EXTERNAL (vnode->decl))
+	continue;
+      if (DECL_COMDAT (vnode->decl)
+	  && !vnode->force_output
+	  && vnode->finalized 
+	  && DECL_VIRTUAL_P (vnode->decl))
+	continue;
+      if (vnode->alias && !vnode->alias_of)
+	continue;
+      write_symbol (cache, &stream, vnode->decl, seen, false);
+    }
+
+  /* Write all aliases.  */
+  defined = propagate_aliases_backward (trivally_defined_alias, &setdata);
+  FOR_EACH_VEC_ELT (alias_pair, alias_pairs, i, p)
+    if (output_alias_pair_p (p, defined, set, vset))
+      write_symbol (cache, &stream, p->decl, seen, true);
+  symbol_alias_set_destroy (defined);
+
+  lto_write_stream (&stream);
+  pointer_set_destroy (seen);
+
+  lto_end_section ();
+}
+
+
+/* This pass is run after all of the functions are serialized and all
+   of the IPA passes have written their serialized forms.  This pass
+   causes the vector of all of the global decls and types used from
+   this file to be written in to a section that can then be read in to
+   recover these on other side.  */
+
+static void
+produce_asm_for_decls (cgraph_node_set set, varpool_node_set vset)
+{
+  struct lto_out_decl_state *out_state;
+  struct lto_out_decl_state *fn_out_state;
+  struct lto_decl_header header;
+  char *section_name;
+  struct output_block *ob;
+  struct lto_output_stream *header_stream, *decl_state_stream;
+  unsigned idx, num_fns;
+  size_t decl_state_size;
+  int32_t num_decl_states;
+
+  ob = create_output_block (LTO_section_decls);
+  ob->global = true;
+
+  /* Write out unreferenced globals, alias pairs and labels.  We defer
+     doing this until now so that we can write out only what is
+     needed.  */
+  output_unreferenced_globals (set, vset);
+
+  memset (&header, 0, sizeof (struct lto_decl_header));
+
+  section_name = lto_get_section_name (LTO_section_decls, NULL, NULL);
+  lto_begin_section (section_name, !flag_wpa);
+  free (section_name);
+
+  /* Make string 0 be a NULL string.  */
+  streamer_write_char_stream (ob->string_stream, 0);
+
+  /* Write the global symbols.  */
+  out_state = lto_get_out_decl_state ();
+  num_fns = VEC_length (lto_out_decl_state_ptr, lto_function_decl_states);
+  lto_output_decl_state_streams (ob, out_state);
+  for (idx = 0; idx < num_fns; idx++)
+    {
+      fn_out_state =
+	VEC_index (lto_out_decl_state_ptr, lto_function_decl_states, idx);
+      lto_output_decl_state_streams (ob, fn_out_state);
+    }
+
+  header.lto_header.major_version = LTO_major_version;
+  header.lto_header.minor_version = LTO_minor_version;
+  header.lto_header.section_type = LTO_section_decls;
+
+  /* Currently not used.  This field would allow us to preallocate
+     the globals vector, so that it need not be resized as it is extended.  */
+  header.num_nodes = -1;
+
+  /* Compute the total size of all decl out states. */
+  decl_state_size = sizeof (int32_t);
+  decl_state_size += lto_out_decl_state_written_size (out_state);
+  for (idx = 0; idx < num_fns; idx++)
+    {
+      fn_out_state =
+	VEC_index (lto_out_decl_state_ptr, lto_function_decl_states, idx);
+      decl_state_size += lto_out_decl_state_written_size (fn_out_state);
+    }
+  header.decl_state_size = decl_state_size;
+
+  header.main_size = ob->main_stream->total_size;
+  header.string_size = ob->string_stream->total_size;
+
+  header_stream = XCNEW (struct lto_output_stream);
+  lto_output_data_stream (header_stream, &header, sizeof header);
+  lto_write_stream (header_stream);
+  free (header_stream);
+
+  /* Write the main out-decl state, followed by out-decl states of
+     functions. */
+  decl_state_stream = ((struct lto_output_stream *)
+		       xcalloc (1, sizeof (struct lto_output_stream)));
+  num_decl_states = num_fns + 1;
+  lto_output_data_stream (decl_state_stream, &num_decl_states,
+			  sizeof (num_decl_states));
+  lto_output_decl_state_refs (ob, decl_state_stream, out_state);
+  for (idx = 0; idx < num_fns; idx++)
+    {
+      fn_out_state =
+	VEC_index (lto_out_decl_state_ptr, lto_function_decl_states, idx);
+      lto_output_decl_state_refs (ob, decl_state_stream, fn_out_state);
+    }
+  lto_write_stream (decl_state_stream);
+  free(decl_state_stream);
+
+  lto_write_stream (ob->main_stream);
+  lto_write_stream (ob->string_stream);
+
+  lto_end_section ();
+
+  /* Write the symbol table.  It is used by linker to determine dependencies
+     and thus we can skip it for WPA.  */
+  if (!flag_wpa)
+    produce_symtab (ob, set, vset);
+
+  /* Write command line opts.  */
+  lto_write_options ();
+
+  /* Deallocate memory and clean up.  */
+  for (idx = 0; idx < num_fns; idx++)
+    {
+      fn_out_state =
+	VEC_index (lto_out_decl_state_ptr, lto_function_decl_states, idx);
+      lto_delete_out_decl_state (fn_out_state);
+    }
+  lto_cgraph_encoder_delete (ob->decl_state->cgraph_node_encoder);
+  lto_varpool_encoder_delete (ob->decl_state->varpool_node_encoder);
+  VEC_free (lto_out_decl_state_ptr, heap, lto_function_decl_states);
+  lto_function_decl_states = NULL;
+  destroy_output_block (ob);
+}
+
+
+struct ipa_opt_pass_d pass_ipa_lto_finish_out =
+{
+ {
+  IPA_PASS,
+  "lto_decls_out",	                /* name */
+  gate_lto_out,			        /* gate */
+  NULL,        	                        /* execute */
+  NULL,					/* sub */
+  NULL,					/* next */
+  0,					/* static_pass_number */
+  TV_IPA_LTO_DECL_OUT,		        /* tv_id */
+  0,	                                /* properties_required */
+  0,					/* properties_provided */
+  0,					/* properties_destroyed */
+  0,            			/* todo_flags_start */
+  0                                     /* todo_flags_finish */
+ },
+ NULL,		                        /* generate_summary */
+ produce_asm_for_decls,			/* write_summary */
+ NULL,		         		/* read_summary */
+ produce_asm_for_decls,			/* write_optimization_summary */
+ NULL,					/* read_optimization_summary */
+ NULL,					/* stmt_fixup */
+ 0,					/* TODOs */
+ NULL,			                /* function_transform */
+ NULL					/* variable_transform */
+};