[gcc.git] / gcc / lto-streamer.c

/* Miscellaneous utilities for GIMPLE streaming.  Things that are used
   in both input and output are here.

   Copyright 2009, 2010 Free Software Foundation, Inc.
   Contributed by Doug Kwan <dougkwan@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 "toplev.h"
#include "flags.h"
#include "tree.h"
#include "gimple.h"
#include "tree-flow.h"
#include "diagnostic-core.h"
#include "bitmap.h"
#include "vec.h"
#include "tree-streamer.h"
#include "lto-streamer.h"
#include "streamer-hooks.h"

/* Statistics gathered during LTO, WPA and LTRANS.  */
struct lto_stats_d lto_stats;

/* LTO uses bitmaps with different life-times.  So use a seperate
   obstack for all LTO bitmaps.  */
static bitmap_obstack lto_obstack;
static bool lto_obstack_initialized;


/* Return a string representing LTO tag TAG.  */

const char *
lto_tag_name (enum LTO_tags tag)
{
  if (lto_tag_is_tree_code_p (tag))
    {
      /* For tags representing tree nodes, return the name of the
	 associated tree code.  */
      return tree_code_name[lto_tag_to_tree_code (tag)];
    }

  if (lto_tag_is_gimple_code_p (tag))
    {
      /* For tags representing gimple statements, return the name of
	 the associated gimple code.  */
      return gimple_code_name[lto_tag_to_gimple_code (tag)];
    }

  switch (tag)
    {
    case LTO_null:
      return "LTO_null";
    case LTO_bb0:
      return "LTO_bb0";
    case LTO_bb1:
      return "LTO_bb1";
    case LTO_eh_region:
      return "LTO_eh_region";
    case LTO_function:
      return "LTO_function";
    case LTO_eh_table:
      return "LTO_eh_table";
    case LTO_ert_cleanup:
      return "LTO_ert_cleanup";
    case LTO_ert_try:
      return "LTO_ert_try";
    case LTO_ert_allowed_exceptions:
      return "LTO_ert_allowed_exceptions";
    case LTO_ert_must_not_throw:
      return "LTO_ert_must_not_throw";
    case LTO_tree_pickle_reference:
      return "LTO_tree_pickle_reference";
    case LTO_field_decl_ref:
      return "LTO_field_decl_ref";
    case LTO_function_decl_ref:
      return "LTO_function_decl_ref";
    case LTO_label_decl_ref:
      return "LTO_label_decl_ref";
    case LTO_namespace_decl_ref:
      return "LTO_namespace_decl_ref";
    case LTO_result_decl_ref:
      return "LTO_result_decl_ref";
    case LTO_ssa_name_ref:
      return "LTO_ssa_name_ref";
    case LTO_type_decl_ref:
      return "LTO_type_decl_ref";
    case LTO_type_ref:
      return "LTO_type_ref";
    case LTO_global_decl_ref:
      return "LTO_global_decl_ref";
    default:
      return "LTO_UNKNOWN";
    }
}


/* Allocate a bitmap from heap.  Initializes the LTO obstack if necessary.  */

bitmap
lto_bitmap_alloc (void)
{
  if (!lto_obstack_initialized)
    {
      bitmap_obstack_initialize (&lto_obstack);
      lto_obstack_initialized = true;
    }
  return BITMAP_ALLOC (&lto_obstack);
}

/* Free bitmap B.  */

void
lto_bitmap_free (bitmap b)
{
  BITMAP_FREE (b);
}


/* Get a section name for a particular type or name.  The NAME field
   is only used if SECTION_TYPE is LTO_section_function_body. For all
   others it is ignored.  The callee of this function is responsible
   to free the returned name.  */

char *
lto_get_section_name (int section_type, const char *name, struct lto_file_decl_data *f)
{
  const char *add;
  char post[32];
  const char *sep;

  if (section_type == LTO_section_function_body)
    {
      gcc_assert (name != NULL);
      if (name[0] == '*')
	name++;
      add = name;
      sep = "";
    }
  else if (section_type < LTO_N_SECTION_TYPES)
    {
      add = lto_section_name[section_type];
      sep = ".";
    }
  else
    internal_error ("bytecode stream: unexpected LTO section %s", name);

  /* Make the section name unique so that ld -r combining sections
     doesn't confuse the reader with merged sections.

     For options don't add a ID, the option reader cannot deal with them
     and merging should be ok here.

     XXX: use crc64 to minimize collisions? */
  if (section_type == LTO_section_opts)
    strcpy (post, "");
  else
    sprintf (post, ".%x", f ? f->id : crc32_string(0, get_random_seed (false)));
  return concat (LTO_SECTION_NAME_PREFIX, sep, add, post, NULL);
}


/* Show various memory usage statistics related to LTO.  */

void
print_lto_report (void)
{
  const char *s = (flag_lto) ? "LTO" : (flag_wpa) ? "WPA" : "LTRANS";
  unsigned i;

  fprintf (stderr, "%s statistics\n", s);
  fprintf (stderr, "[%s] # of input files: "
	   HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, lto_stats.num_input_files);

  fprintf (stderr, "[%s] # of input cgraph nodes: "
	   HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	   lto_stats.num_input_cgraph_nodes);

  fprintf (stderr, "[%s] # of function bodies: "
	   HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	   lto_stats.num_function_bodies);

  fprintf (stderr, "[%s] ", s);
  print_gimple_types_stats ();

  for (i = 0; i < NUM_TREE_CODES; i++)
    if (lto_stats.num_trees[i])
      fprintf (stderr, "[%s] # of '%s' objects read: "
	       HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	       tree_code_name[i], lto_stats.num_trees[i]);

  if (flag_lto)
    {
      fprintf (stderr, "[%s] Compression: "
	       HOST_WIDE_INT_PRINT_UNSIGNED " output bytes, "
	       HOST_WIDE_INT_PRINT_UNSIGNED " compressed bytes", s,
	       lto_stats.num_output_il_bytes,
	       lto_stats.num_compressed_il_bytes);
      if (lto_stats.num_output_il_bytes > 0)
	{
	  const float dividend = (float) lto_stats.num_compressed_il_bytes;
	  const float divisor = (float) lto_stats.num_output_il_bytes;
	  fprintf (stderr, " (ratio: %f)", dividend / divisor);
	}
      fprintf (stderr, "\n");
    }

  if (flag_wpa)
    {
      fprintf (stderr, "[%s] # of output files: "
	       HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	       lto_stats.num_output_files);

      fprintf (stderr, "[%s] # of output cgraph nodes: "
	       HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	       lto_stats.num_output_cgraph_nodes);

      fprintf (stderr, "[%s] # callgraph partitions: "
	       HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	       lto_stats.num_cgraph_partitions);

      fprintf (stderr, "[%s] Compression: "
	       HOST_WIDE_INT_PRINT_UNSIGNED " input bytes, "
	       HOST_WIDE_INT_PRINT_UNSIGNED " uncompressed bytes", s,
	       lto_stats.num_input_il_bytes,
	       lto_stats.num_uncompressed_il_bytes);
      if (lto_stats.num_input_il_bytes > 0)
	{
	  const float dividend = (float) lto_stats.num_uncompressed_il_bytes;
	  const float divisor = (float) lto_stats.num_input_il_bytes;
	  fprintf (stderr, " (ratio: %f)", dividend / divisor);
	}
      fprintf (stderr, "\n");
    }

  for (i = 0; i < LTO_N_SECTION_TYPES; i++)
    fprintf (stderr, "[%s] Size of mmap'd section %s: "
	     HOST_WIDE_INT_PRINT_UNSIGNED " bytes\n", s,
	     lto_section_name[i], lto_stats.section_size[i]);
}


#ifdef LTO_STREAMER_DEBUG
static htab_t tree_htab;

struct tree_hash_entry
{
  tree key;
  intptr_t value;
};

static hashval_t
hash_tree (const void *p)
{
  const struct tree_hash_entry *e = (const struct tree_hash_entry *) p;
  return htab_hash_pointer (e->key);
}

static int
eq_tree (const void *p1, const void *p2)
{
  const struct tree_hash_entry *e1 = (const struct tree_hash_entry *) p1;
  const struct tree_hash_entry *e2 = (const struct tree_hash_entry *) p2;
  return (e1->key == e2->key);
}
#endif

/* Initialization common to the LTO reader and writer.  */

void
lto_streamer_init (void)
{
  /* Check that all the TS_* handled by the reader and writer routines
     match exactly the structures defined in treestruct.def.  When a
     new TS_* astructure is added, the streamer should be updated to
     handle it.  */
  streamer_check_handled_ts_structures ();

#ifdef LTO_STREAMER_DEBUG
  tree_htab = htab_create (31, hash_tree, eq_tree, NULL);
#endif
}


/* Gate function for all LTO streaming passes.  */

bool
gate_lto_out (void)
{
  return ((flag_generate_lto || in_lto_p)
	  /* Don't bother doing anything if the program has errors.  */
	  && !seen_error ());
}


#ifdef LTO_STREAMER_DEBUG
/* Add a mapping between T and ORIG_T, which is the numeric value of
   the original address of T as it was seen by the LTO writer.  This
   mapping is useful when debugging streaming problems.  A debugging
   session can be started on both reader and writer using ORIG_T
   as a breakpoint value in both sessions.

   Note that this mapping is transient and only valid while T is
   being reconstructed.  Once T is fully built, the mapping is
   removed.  */

void
lto_orig_address_map (tree t, intptr_t orig_t)
{
  struct tree_hash_entry ent;
  struct tree_hash_entry **slot;

  ent.key = t;
  ent.value = orig_t;
  slot
    = (struct tree_hash_entry **) htab_find_slot (tree_htab, &ent, INSERT);
  gcc_assert (!*slot);
  *slot = XNEW (struct tree_hash_entry);
  **slot = ent;
}


/* Get the original address of T as it was seen by the writer.  This
   is only valid while T is being reconstructed.  */

intptr_t
lto_orig_address_get (tree t)
{
  struct tree_hash_entry ent;
  struct tree_hash_entry **slot;

  ent.key = t;
  slot
    = (struct tree_hash_entry **) htab_find_slot (tree_htab, &ent, NO_INSERT);
  return (slot ? (*slot)->value : 0);
}


/* Clear the mapping of T to its original address.  */

void
lto_orig_address_remove (tree t)
{
  struct tree_hash_entry ent;
  struct tree_hash_entry **slot;

  ent.key = t;
  slot
    = (struct tree_hash_entry **) htab_find_slot (tree_htab, &ent, NO_INSERT);
  gcc_assert (slot);
  free (*slot);
  htab_clear_slot (tree_htab, (PTR *)slot);
}
#endif


/* Check that the version MAJOR.MINOR is the correct version number.  */

void
lto_check_version (int major, int minor)
{
  if (major != LTO_major_version || minor != LTO_minor_version)
    fatal_error ("bytecode stream generated with LTO version %d.%d instead "
	         "of the expected %d.%d",
		 major, minor,
		 LTO_major_version, LTO_minor_version);
}


/* Initialize all the streamer hooks used for streaming GIMPLE.  */

void
lto_streamer_hooks_init (void)
{
  streamer_hooks_init ();
  streamer_hooks.write_tree = lto_output_tree;
  streamer_hooks.read_tree = lto_input_tree;
}
Commit	Line	Data
d7f09764 DN	1	/* Miscellaneous utilities for GIMPLE streaming. Things that are used
	2	in both input and output are here.
	3
91539475	4	Copyright 2009, 2010 Free Software Foundation, Inc.
d7f09764 DN	5	Contributed by Doug Kwan <dougkwan@google.com>
	6
	7	This file is part of GCC.
	8
	9	GCC is free software; you can redistribute it and/or modify it under
	10	the terms of the GNU General Public License as published by the Free
	11	Software Foundation; either version 3, or (at your option) any later
	12	version.
	13
	14	GCC is distributed in the hope that it will be useful, but WITHOUT ANY
	15	WARRANTY; without even the implied warranty of MERCHANTABILITY or
	16	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	17	for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with GCC; see the file COPYING3. If not see
	21	<http://www.gnu.org/licenses/>. */
	22
	23	#include "config.h"
	24	#include "system.h"
	25	#include "coretypes.h"
	26	#include "tm.h"
	27	#include "toplev.h"
	28	#include "flags.h"
	29	#include "tree.h"
	30	#include "gimple.h"
	31	#include "tree-flow.h"
1da2ed5f	32	#include "diagnostic-core.h"
d7f09764 DN	33	#include "bitmap.h"
d7f09764 DN	34	#include "vec.h"
f0efc7aa	35	#include "tree-streamer.h"
d7f09764	36	#include "lto-streamer.h"
f0efc7aa	37	#include "streamer-hooks.h"
d7f09764 DN	38
	39	/* Statistics gathered during LTO, WPA and LTRANS. */
	40	struct lto_stats_d lto_stats;
	41
	42	/* LTO uses bitmaps with different life-times. So use a seperate
	43	obstack for all LTO bitmaps. */
	44	static bitmap_obstack lto_obstack;
	45	static bool lto_obstack_initialized;
	46
	47
	48	/* Return a string representing LTO tag TAG. */
	49
	50	const char *
	51	lto_tag_name (enum LTO_tags tag)
	52	{
	53	if (lto_tag_is_tree_code_p (tag))
	54	{
	55	/* For tags representing tree nodes, return the name of the
	56	associated tree code. */
	57	return tree_code_name[lto_tag_to_tree_code (tag)];
	58	}
	59
	60	if (lto_tag_is_gimple_code_p (tag))
	61	{
	62	/* For tags representing gimple statements, return the name of
	63	the associated gimple code. */
	64	return gimple_code_name[lto_tag_to_gimple_code (tag)];
	65	}
	66
	67	switch (tag)
	68	{
	69	case LTO_null:
	70	return "LTO_null";
	71	case LTO_bb0:
	72	return "LTO_bb0";
	73	case LTO_bb1:
	74	return "LTO_bb1";
	75	case LTO_eh_region:
	76	return "LTO_eh_region";
	77	case LTO_function:
	78	return "LTO_function";
	79	case LTO_eh_table:
	80	return "LTO_eh_table";
	81	case LTO_ert_cleanup:
	82	return "LTO_ert_cleanup";
	83	case LTO_ert_try:
	84	return "LTO_ert_try";
	85	case LTO_ert_allowed_exceptions:
	86	return "LTO_ert_allowed_exceptions";
	87	case LTO_ert_must_not_throw:
	88	return "LTO_ert_must_not_throw";
	89	case LTO_tree_pickle_reference:
	90	return "LTO_tree_pickle_reference";
	91	case LTO_field_decl_ref:
	92	return "LTO_field_decl_ref";
	93	case LTO_function_decl_ref:
	94	return "LTO_function_decl_ref";
	95	case LTO_label_decl_ref:
	96	return "LTO_label_decl_ref";
	97	case LTO_namespace_decl_ref:
	98	return "LTO_namespace_decl_ref";
	99	case LTO_result_decl_ref:
	100	return "LTO_result_decl_ref";
	101	case LTO_ssa_name_ref:
102	return "LTO_ssa_name_ref";
103	case LTO_type_decl_ref:
104	return "LTO_type_decl_ref";
105	case LTO_type_ref:
106	return "LTO_type_ref";
107	case LTO_global_decl_ref:
108	return "LTO_global_decl_ref";
109	default:
110	return "LTO_UNKNOWN";
111	}
112	}
113
114
115	/* Allocate a bitmap from heap. Initializes the LTO obstack if necessary. */
116
117	bitmap
118	lto_bitmap_alloc (void)
119	{
120	if (!lto_obstack_initialized)
121	{
122	bitmap_obstack_initialize (&lto_obstack);
123	lto_obstack_initialized = true;
124	}
125	return BITMAP_ALLOC (&lto_obstack);
126	}
127
128	/* Free bitmap B. */
129
130	void
131	lto_bitmap_free (bitmap b)
132	{
133	BITMAP_FREE (b);
134	}
135
136
137	/* Get a section name for a particular type or name. The NAME field
73ce4d1e AK	138	is only used if SECTION_TYPE is LTO_section_function_body. For all
	139	others it is ignored. The callee of this function is responsible
	140	to free the returned name. */
d7f09764 DN	141
d7f09764 DN	142	char *
73ce4d1e	143	lto_get_section_name (int section_type, const char name, struct lto_file_decl_data f)
d7f09764	144	{
73ce4d1e AK	145	const char *add;
	146	char post[32];
	147	const char *sep;
	148
	149	if (section_type == LTO_section_function_body)
d7f09764	150	{
91539475 L	151	gcc_assert (name != NULL);
	152	if (name[0] == '*')
	153	name++;
73ce4d1e AK	154	add = name;
	155	sep = "";
	156	}
	157	else if (section_type < LTO_N_SECTION_TYPES)
	158	{
	159	add = lto_section_name[section_type];
	160	sep = ".";
	161	}
	162	else
	163	internal_error ("bytecode stream: unexpected LTO section %s", name);
d7f09764	164
73ce4d1e AK	165	/* Make the section name unique so that ld -r combining sections
73ce4d1e AK	166	doesn't confuse the reader with merged sections.
d7f09764	167
73ce4d1e AK	168	For options don't add a ID, the option reader cannot deal with them
73ce4d1e AK	169	and merging should be ok here.
922f15c2	170
73ce4d1e AK	171	XXX: use crc64 to minimize collisions? */
	172	if (section_type == LTO_section_opts)
	173	strcpy (post, "");
	174	else
	175	sprintf (post, ".%x", f ? f->id : crc32_string(0, get_random_seed (false)));
	176	return concat (LTO_SECTION_NAME_PREFIX, sep, add, post, NULL);
d7f09764 DN	177	}
	178
	179
	180	/* Show various memory usage statistics related to LTO. */
	181
	182	void
	183	print_lto_report (void)
	184	{
	185	const char *s = (flag_lto) ? "LTO" : (flag_wpa) ? "WPA" : "LTRANS";
	186	unsigned i;
	187
	188	fprintf (stderr, "%s statistics\n", s);
	189	fprintf (stderr, "[%s] # of input files: "
	190	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, lto_stats.num_input_files);
	191
b8698a0f	192	fprintf (stderr, "[%s] # of input cgraph nodes: "
d7f09764 DN	193	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	194	lto_stats.num_input_cgraph_nodes);
	195
	196	fprintf (stderr, "[%s] # of function bodies: "
	197	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	198	lto_stats.num_function_bodies);
	199
	200	fprintf (stderr, "[%s] ", s);
	201	print_gimple_types_stats ();
	202
	203	for (i = 0; i < NUM_TREE_CODES; i++)
	204	if (lto_stats.num_trees[i])
	205	fprintf (stderr, "[%s] # of '%s' objects read: "
	206	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	207	tree_code_name[i], lto_stats.num_trees[i]);
	208
	209	if (flag_lto)
	210	{
	211	fprintf (stderr, "[%s] Compression: "
	212	HOST_WIDE_INT_PRINT_UNSIGNED " output bytes, "
	213	HOST_WIDE_INT_PRINT_UNSIGNED " compressed bytes", s,
	214	lto_stats.num_output_il_bytes,
	215	lto_stats.num_compressed_il_bytes);
	216	if (lto_stats.num_output_il_bytes > 0)
	217	{
	218	const float dividend = (float) lto_stats.num_compressed_il_bytes;
	219	const float divisor = (float) lto_stats.num_output_il_bytes;
	220	fprintf (stderr, " (ratio: %f)", dividend / divisor);
	221	}
	222	fprintf (stderr, "\n");
	223	}
	224
	225	if (flag_wpa)
	226	{
	227	fprintf (stderr, "[%s] # of output files: "
	228	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	229	lto_stats.num_output_files);
	230
	231	fprintf (stderr, "[%s] # of output cgraph nodes: "
	232	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	233	lto_stats.num_output_cgraph_nodes);
	234
	235	fprintf (stderr, "[%s] # callgraph partitions: "
	236	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	237	lto_stats.num_cgraph_partitions);
	238
	239	fprintf (stderr, "[%s] Compression: "
	240	HOST_WIDE_INT_PRINT_UNSIGNED " input bytes, "
	241	HOST_WIDE_INT_PRINT_UNSIGNED " uncompressed bytes", s,
	242	lto_stats.num_input_il_bytes,
	243	lto_stats.num_uncompressed_il_bytes);
	244	if (lto_stats.num_input_il_bytes > 0)
	245	{
	246	const float dividend = (float) lto_stats.num_uncompressed_il_bytes;
	247	const float divisor = (float) lto_stats.num_input_il_bytes;
	248	fprintf (stderr, " (ratio: %f)", dividend / divisor);
	249	}
	250	fprintf (stderr, "\n");
	251	}
	252
	253	for (i = 0; i < LTO_N_SECTION_TYPES; i++)
	254	fprintf (stderr, "[%s] Size of mmap'd section %s: "
	255	HOST_WIDE_INT_PRINT_UNSIGNED " bytes\n", s,
	256	lto_section_name[i], lto_stats.section_size[i]);
257	}
258
d7f09764	259
331c7fcd EB	260	#ifdef LTO_STREAMER_DEBUG
	261	static htab_t tree_htab;
	262
	263	struct tree_hash_entry
	264	{
	265	tree key;
	266	intptr_t value;
	267	};
	268
	269	static hashval_t
	270	hash_tree (const void *p)
	271	{
	272	const struct tree_hash_entry e = (const struct tree_hash_entry ) p;
	273	return htab_hash_pointer (e->key);
	274	}
	275
	276	static int
	277	eq_tree (const void p1, const void p2)
	278	{
	279	const struct tree_hash_entry e1 = (const struct tree_hash_entry ) p1;
	280	const struct tree_hash_entry e2 = (const struct tree_hash_entry ) p2;
	281	return (e1->key == e2->key);
	282	}
	283	#endif
	284
d7f09764 DN	285	/* Initialization common to the LTO reader and writer. */
	286
	287	void
	288	lto_streamer_init (void)
	289	{
	290	/* Check that all the TS_* handled by the reader and writer routines
	291	match exactly the structures defined in treestruct.def. When a
	292	new TS_* astructure is added, the streamer should be updated to
	293	handle it. */
412288f1	294	streamer_check_handled_ts_structures ();
331c7fcd EB	295
	296	#ifdef LTO_STREAMER_DEBUG
	297	tree_htab = htab_create (31, hash_tree, eq_tree, NULL);
	298	#endif
d7f09764 DN	299	}
	300
	301
	302	/* Gate function for all LTO streaming passes. */
	303
	304	bool
	305	gate_lto_out (void)
	306	{
	307	return ((flag_generate_lto \|\| in_lto_p)
	308	/* Don't bother doing anything if the program has errors. */
1da2ed5f	309	&& !seen_error ());
d7f09764 DN	310	}
	311
	312
	313	#ifdef LTO_STREAMER_DEBUG
	314	/* Add a mapping between T and ORIG_T, which is the numeric value of
	315	the original address of T as it was seen by the LTO writer. This
	316	mapping is useful when debugging streaming problems. A debugging
	317	session can be started on both reader and writer using ORIG_T
	318	as a breakpoint value in both sessions.
	319
b8698a0f	320	Note that this mapping is transient and only valid while T is
d7f09764 DN	321	being reconstructed. Once T is fully built, the mapping is
	322	removed. */
	323
	324	void
	325	lto_orig_address_map (tree t, intptr_t orig_t)
	326	{
331c7fcd EB	327	struct tree_hash_entry ent;
	328	struct tree_hash_entry **slot;
	329
	330	ent.key = t;
	331	ent.value = orig_t;
	332	slot
	333	= (struct tree_hash_entry **) htab_find_slot (tree_htab, &ent, INSERT);
	334	gcc_assert (!*slot);
	335	*slot = XNEW (struct tree_hash_entry);
	336	**slot = ent;
d7f09764 DN	337	}
	338
	339
	340	/* Get the original address of T as it was seen by the writer. This
	341	is only valid while T is being reconstructed. */
	342
	343	intptr_t
	344	lto_orig_address_get (tree t)
	345	{
331c7fcd EB	346	struct tree_hash_entry ent;
	347	struct tree_hash_entry **slot;
	348
	349	ent.key = t;
	350	slot
	351	= (struct tree_hash_entry **) htab_find_slot (tree_htab, &ent, NO_INSERT);
	352	return (slot ? (*slot)->value : 0);
d7f09764 DN	353	}
	354
	355
	356	/* Clear the mapping of T to its original address. */
	357
	358	void
	359	lto_orig_address_remove (tree t)
	360	{
331c7fcd EB	361	struct tree_hash_entry ent;
	362	struct tree_hash_entry **slot;
	363
	364	ent.key = t;
	365	slot
	366	= (struct tree_hash_entry **) htab_find_slot (tree_htab, &ent, NO_INSERT);
	367	gcc_assert (slot);
	368	free (*slot);
	369	htab_clear_slot (tree_htab, (PTR *)slot);
d7f09764 DN	370	}
	371	#endif
	372
	373
	374	/* Check that the version MAJOR.MINOR is the correct version number. */
	375
	376	void
	377	lto_check_version (int major, int minor)
	378	{
	379	if (major != LTO_major_version \|\| minor != LTO_minor_version)
	380	fatal_error ("bytecode stream generated with LTO version %d.%d instead "
	381	"of the expected %d.%d",
	382	major, minor,
	383	LTO_major_version, LTO_minor_version);
	384	}
47c79d56 DN	385
47c79d56 DN	386
47c79d56 DN	387	/* Initialize all the streamer hooks used for streaming GIMPLE. */
	388
	389	void
	390	lto_streamer_hooks_init (void)
	391	{
	392	streamer_hooks_init ();
b9393656 DN	393	streamer_hooks.write_tree = lto_output_tree;
b9393656 DN	394	streamer_hooks.read_tree = lto_input_tree;
47c79d56	395	}