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

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

   Copyright (C) 2009-2014 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 "basic-block.h"
#include "tree-ssa-alias.h"
#include "internal-fn.h"
#include "gimple-expr.h"
#include "is-a.h"
#include "gimple.h"
#include "bitmap.h"
#include "diagnostic-core.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 separate
   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 get_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. */
  if (section_type == LTO_section_opts)
    strcpy (post, "");
  else if (f != NULL) 
    sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, f->id);
  else
    sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, 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 (const char *s)
{
  unsigned i;

  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);

  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,
	       get_tree_code_name ((enum tree_code) 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 symtab nodes: "
	       HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	       lto_stats.num_output_symtab_nodes);

      fprintf (stderr, "[%s] # of output tree pickle references: "
	       HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	       lto_stats.num_pickle_refs_output);
      fprintf (stderr, "[%s] # of output tree bodies: "
	       HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	       lto_stats.num_tree_bodies_output);

      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
struct tree_hash_entry
{
  tree key;
  intptr_t value;
};

struct tree_entry_hasher : typed_noop_remove <tree_hash_entry>
{
  typedef tree_hash_entry value_type;
  typedef tree_hash_entry compare_type;
  static inline hashval_t hash (const value_type *);
  static inline bool equal (const value_type *, const compare_type *);
};

inline hashval_t
tree_entry_hasher::hash (const value_type *e)
{
  return htab_hash_pointer (e->key);
}

inline bool
tree_entry_hasher::equal (const value_type *e1, const compare_type *e2)
{
  return (e1->key == e2->key);
}

static hash_table <tree_hash_entry> tree_htab;
#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.create (31);
#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 = tree_htab.find_slot (&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 = tree_htab.find_slot (&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 = tree_htab.find_slot (&ent, NO_INSERT);
  gcc_assert (slot);
  free (*slot);
  tree_htab.clear_slot (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;
  streamer_hooks.input_location = lto_input_location;
  streamer_hooks.output_location = lto_output_location;
}
Commit	Line	Data
d7f09764 DN	1	/* Miscellaneous utilities for GIMPLE streaming. Things that are used
	2	in both input and output are here.
	3
23a5b65a	4	Copyright (C) 2009-2014 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"
2fb9a547 AM	30	#include "basic-block.h"
	31	#include "tree-ssa-alias.h"
	32	#include "internal-fn.h"
	33	#include "gimple-expr.h"
	34	#include "is-a.h"
8e9055ae	35	#include "gimple.h"
d7f09764	36	#include "bitmap.h"
442b4905	37	#include "diagnostic-core.h"
f0efc7aa	38	#include "tree-streamer.h"
d7f09764	39	#include "lto-streamer.h"
f0efc7aa	40	#include "streamer-hooks.h"
d7f09764 DN	41
	42	/* Statistics gathered during LTO, WPA and LTRANS. */
	43	struct lto_stats_d lto_stats;
	44
073a8998	45	/* LTO uses bitmaps with different life-times. So use a separate
d7f09764 DN	46	obstack for all LTO bitmaps. */
	47	static bitmap_obstack lto_obstack;
	48	static bool lto_obstack_initialized;
	49
	50
	51	/* Return a string representing LTO tag TAG. */
	52
	53	const char *
	54	lto_tag_name (enum LTO_tags tag)
	55	{
	56	if (lto_tag_is_tree_code_p (tag))
	57	{
	58	/* For tags representing tree nodes, return the name of the
	59	associated tree code. */
5806f481	60	return get_tree_code_name (lto_tag_to_tree_code (tag));
d7f09764 DN	61	}
	62
	63	if (lto_tag_is_gimple_code_p (tag))
	64	{
	65	/* For tags representing gimple statements, return the name of
	66	the associated gimple code. */
	67	return gimple_code_name[lto_tag_to_gimple_code (tag)];
	68	}
	69
	70	switch (tag)
	71	{
	72	case LTO_null:
	73	return "LTO_null";
	74	case LTO_bb0:
	75	return "LTO_bb0";
	76	case LTO_bb1:
	77	return "LTO_bb1";
	78	case LTO_eh_region:
	79	return "LTO_eh_region";
	80	case LTO_function:
	81	return "LTO_function";
	82	case LTO_eh_table:
	83	return "LTO_eh_table";
	84	case LTO_ert_cleanup:
	85	return "LTO_ert_cleanup";
	86	case LTO_ert_try:
	87	return "LTO_ert_try";
	88	case LTO_ert_allowed_exceptions:
	89	return "LTO_ert_allowed_exceptions";
	90	case LTO_ert_must_not_throw:
	91	return "LTO_ert_must_not_throw";
	92	case LTO_tree_pickle_reference:
	93	return "LTO_tree_pickle_reference";
	94	case LTO_field_decl_ref:
	95	return "LTO_field_decl_ref";
	96	case LTO_function_decl_ref:
	97	return "LTO_function_decl_ref";
	98	case LTO_label_decl_ref:
	99	return "LTO_label_decl_ref";
	100	case LTO_namespace_decl_ref:
	101	return "LTO_namespace_decl_ref";
	102	case LTO_result_decl_ref:
	103	return "LTO_result_decl_ref";
	104	case LTO_ssa_name_ref:
	105	return "LTO_ssa_name_ref";
	106	case LTO_type_decl_ref:
	107	return "LTO_type_decl_ref";
	108	case LTO_type_ref:
	109	return "LTO_type_ref";
	110	case LTO_global_decl_ref:
	111	return "LTO_global_decl_ref";
	112	default:
	113	return "LTO_UNKNOWN";
	114	}
	115	}
	116
	117
	118	/* Allocate a bitmap from heap. Initializes the LTO obstack if necessary. */
	119
	120	bitmap
	121	lto_bitmap_alloc (void)
	122	{
	123	if (!lto_obstack_initialized)
	124	{
125	bitmap_obstack_initialize (&lto_obstack);
126	lto_obstack_initialized = true;
127	}
128	return BITMAP_ALLOC (&lto_obstack);
129	}
130
131	/* Free bitmap B. */
132
133	void
134	lto_bitmap_free (bitmap b)
135	{
136	BITMAP_FREE (b);
137	}
138
139
140	/* Get a section name for a particular type or name. The NAME field
73ce4d1e AK	141	is only used if SECTION_TYPE is LTO_section_function_body. For all
	142	others it is ignored. The callee of this function is responsible
	143	to free the returned name. */
d7f09764 DN	144
d7f09764 DN	145	char *
73ce4d1e	146	lto_get_section_name (int section_type, const char name, struct lto_file_decl_data f)
d7f09764	147	{
73ce4d1e AK	148	const char *add;
	149	char post[32];
	150	const char *sep;
	151
	152	if (section_type == LTO_section_function_body)
d7f09764	153	{
91539475 L	154	gcc_assert (name != NULL);
	155	if (name[0] == '*')
	156	name++;
73ce4d1e AK	157	add = name;
	158	sep = "";
	159	}
	160	else if (section_type < LTO_N_SECTION_TYPES)
	161	{
	162	add = lto_section_name[section_type];
	163	sep = ".";
	164	}
	165	else
	166	internal_error ("bytecode stream: unexpected LTO section %s", name);
d7f09764	167
73ce4d1e AK	168	/* Make the section name unique so that ld -r combining sections
73ce4d1e AK	169	doesn't confuse the reader with merged sections.
d7f09764	170
73ce4d1e	171	For options don't add a ID, the option reader cannot deal with them
dde8b360	172	and merging should be ok here. */
73ce4d1e AK	173	if (section_type == LTO_section_opts)
73ce4d1e AK	174	strcpy (post, "");
dde8b360 AK	175	else if (f != NULL)
dde8b360 AK	176	sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, f->id);
73ce4d1e	177	else
dde8b360	178	sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, get_random_seed (false));
73ce4d1e	179	return concat (LTO_SECTION_NAME_PREFIX, sep, add, post, NULL);
d7f09764 DN	180	}
	181
	182
	183	/* Show various memory usage statistics related to LTO. */
	184
	185	void
b8f4e58f	186	print_lto_report (const char *s)
d7f09764	187	{
d7f09764 DN	188	unsigned i;
d7f09764 DN	189
d7f09764 DN	190	fprintf (stderr, "[%s] # of input files: "
	191	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, lto_stats.num_input_files);
	192
b8698a0f	193	fprintf (stderr, "[%s] # of input cgraph nodes: "
d7f09764 DN	194	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	195	lto_stats.num_input_cgraph_nodes);
	196
	197	fprintf (stderr, "[%s] # of function bodies: "
	198	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	199	lto_stats.num_function_bodies);
	200
d7f09764 DN	201	for (i = 0; i < NUM_TREE_CODES; i++)
	202	if (lto_stats.num_trees[i])
	203	fprintf (stderr, "[%s] # of '%s' objects read: "
	204	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
5806f481	205	get_tree_code_name ((enum tree_code) i), lto_stats.num_trees[i]);
d7f09764 DN	206
	207	if (flag_lto)
	208	{
	209	fprintf (stderr, "[%s] Compression: "
	210	HOST_WIDE_INT_PRINT_UNSIGNED " output bytes, "
	211	HOST_WIDE_INT_PRINT_UNSIGNED " compressed bytes", s,
	212	lto_stats.num_output_il_bytes,
	213	lto_stats.num_compressed_il_bytes);
	214	if (lto_stats.num_output_il_bytes > 0)
	215	{
	216	const float dividend = (float) lto_stats.num_compressed_il_bytes;
	217	const float divisor = (float) lto_stats.num_output_il_bytes;
	218	fprintf (stderr, " (ratio: %f)", dividend / divisor);
	219	}
	220	fprintf (stderr, "\n");
	221	}
	222
	223	if (flag_wpa)
	224	{
	225	fprintf (stderr, "[%s] # of output files: "
	226	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	227	lto_stats.num_output_files);
	228
7b99cca4	229	fprintf (stderr, "[%s] # of output symtab nodes: "
d7f09764	230	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
7b99cca4	231	lto_stats.num_output_symtab_nodes);
d7f09764	232
ee03e71d RB	233	fprintf (stderr, "[%s] # of output tree pickle references: "
	234	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	235	lto_stats.num_pickle_refs_output);
	236	fprintf (stderr, "[%s] # of output tree bodies: "
	237	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	238	lto_stats.num_tree_bodies_output);
	239
d7f09764 DN	240	fprintf (stderr, "[%s] # callgraph partitions: "
	241	HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
	242	lto_stats.num_cgraph_partitions);
	243
	244	fprintf (stderr, "[%s] Compression: "
	245	HOST_WIDE_INT_PRINT_UNSIGNED " input bytes, "
	246	HOST_WIDE_INT_PRINT_UNSIGNED " uncompressed bytes", s,
	247	lto_stats.num_input_il_bytes,
	248	lto_stats.num_uncompressed_il_bytes);
	249	if (lto_stats.num_input_il_bytes > 0)
	250	{
	251	const float dividend = (float) lto_stats.num_uncompressed_il_bytes;
	252	const float divisor = (float) lto_stats.num_input_il_bytes;
	253	fprintf (stderr, " (ratio: %f)", dividend / divisor);
	254	}
	255	fprintf (stderr, "\n");
	256	}
	257
	258	for (i = 0; i < LTO_N_SECTION_TYPES; i++)
	259	fprintf (stderr, "[%s] Size of mmap'd section %s: "
	260	HOST_WIDE_INT_PRINT_UNSIGNED " bytes\n", s,
	261	lto_section_name[i], lto_stats.section_size[i]);
	262	}
	263
d7f09764	264
331c7fcd	265	#ifdef LTO_STREAMER_DEBUG
331c7fcd EB	266	struct tree_hash_entry
	267	{
	268	tree key;
	269	intptr_t value;
	270	};
	271
4a8fb1a1 LC	272	struct tree_entry_hasher : typed_noop_remove <tree_hash_entry>
	273	{
	274	typedef tree_hash_entry value_type;
	275	typedef tree_hash_entry compare_type;
	276	static inline hashval_t hash (const value_type *);
	277	static inline bool equal (const value_type , const compare_type );
	278	};
	279
	280	inline hashval_t
	281	tree_entry_hasher::hash (const value_type *e)
331c7fcd	282	{
331c7fcd EB	283	return htab_hash_pointer (e->key);
	284	}
	285
4a8fb1a1 LC	286	inline bool
4a8fb1a1 LC	287	tree_entry_hasher::equal (const value_type e1, const compare_type e2)
331c7fcd	288	{
331c7fcd EB	289	return (e1->key == e2->key);
331c7fcd EB	290	}
4a8fb1a1 LC	291
4a8fb1a1 LC	292	static hash_table <tree_hash_entry> tree_htab;
331c7fcd EB	293	#endif
331c7fcd EB	294
d7f09764 DN	295	/* Initialization common to the LTO reader and writer. */
	296
	297	void
	298	lto_streamer_init (void)
	299	{
	300	/* Check that all the TS_* handled by the reader and writer routines
	301	match exactly the structures defined in treestruct.def. When a
	302	new TS_* astructure is added, the streamer should be updated to
	303	handle it. */
412288f1	304	streamer_check_handled_ts_structures ();
331c7fcd EB	305
331c7fcd EB	306	#ifdef LTO_STREAMER_DEBUG
4a8fb1a1	307	tree_htab.create (31);
331c7fcd	308	#endif
d7f09764 DN	309	}
	310
	311
	312	/* Gate function for all LTO streaming passes. */
	313
	314	bool
	315	gate_lto_out (void)
	316	{
	317	return ((flag_generate_lto \|\| in_lto_p)
	318	/* Don't bother doing anything if the program has errors. */
1da2ed5f	319	&& !seen_error ());
d7f09764 DN	320	}
	321
	322
	323	#ifdef LTO_STREAMER_DEBUG
	324	/* Add a mapping between T and ORIG_T, which is the numeric value of
	325	the original address of T as it was seen by the LTO writer. This
	326	mapping is useful when debugging streaming problems. A debugging
	327	session can be started on both reader and writer using ORIG_T
	328	as a breakpoint value in both sessions.
	329
b8698a0f	330	Note that this mapping is transient and only valid while T is
d7f09764 DN	331	being reconstructed. Once T is fully built, the mapping is
	332	removed. */
	333
	334	void
	335	lto_orig_address_map (tree t, intptr_t orig_t)
	336	{
331c7fcd EB	337	struct tree_hash_entry ent;
	338	struct tree_hash_entry **slot;
	339
	340	ent.key = t;
	341	ent.value = orig_t;
4a8fb1a1	342	slot = tree_htab.find_slot (&ent, INSERT);
331c7fcd EB	343	gcc_assert (!*slot);
	344	*slot = XNEW (struct tree_hash_entry);
	345	**slot = ent;
d7f09764 DN	346	}
	347
	348
	349	/* Get the original address of T as it was seen by the writer. This
	350	is only valid while T is being reconstructed. */
	351
	352	intptr_t
	353	lto_orig_address_get (tree t)
	354	{
331c7fcd EB	355	struct tree_hash_entry ent;
	356	struct tree_hash_entry **slot;
	357
	358	ent.key = t;
4a8fb1a1	359	slot = tree_htab.find_slot (&ent, NO_INSERT);
331c7fcd	360	return (slot ? (*slot)->value : 0);
d7f09764 DN	361	}
	362
	363
	364	/* Clear the mapping of T to its original address. */
	365
	366	void
	367	lto_orig_address_remove (tree t)
	368	{
331c7fcd EB	369	struct tree_hash_entry ent;
	370	struct tree_hash_entry **slot;
	371
	372	ent.key = t;
4a8fb1a1	373	slot = tree_htab.find_slot (&ent, NO_INSERT);
331c7fcd EB	374	gcc_assert (slot);
331c7fcd EB	375	free (*slot);
4a8fb1a1	376	tree_htab.clear_slot (slot);
d7f09764 DN	377	}
	378	#endif
	379
	380
	381	/* Check that the version MAJOR.MINOR is the correct version number. */
	382
	383	void
	384	lto_check_version (int major, int minor)
	385	{
	386	if (major != LTO_major_version \|\| minor != LTO_minor_version)
	387	fatal_error ("bytecode stream generated with LTO version %d.%d instead "
	388	"of the expected %d.%d",
	389	major, minor,
	390	LTO_major_version, LTO_minor_version);
	391	}
47c79d56 DN	392
47c79d56 DN	393
47c79d56 DN	394	/* Initialize all the streamer hooks used for streaming GIMPLE. */
	395
	396	void
	397	lto_streamer_hooks_init (void)
	398	{
	399	streamer_hooks_init ();
b9393656 DN	400	streamer_hooks.write_tree = lto_output_tree;
b9393656 DN	401	streamer_hooks.read_tree = lto_input_tree;
7cb7d208 RB	402	streamer_hooks.input_location = lto_input_location;
7cb7d208 RB	403	streamer_hooks.output_location = lto_output_location;
47c79d56	404	}