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/* Miscellaneous utilities for GIMPLE streaming. Things that are used
in both input and output are here.
Copyright (C) 2009-2015 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 "hash-set.h"
#include "machmode.h"
#include "vec.h"
#include "double-int.h"
#include "input.h"
#include "alias.h"
#include "symtab.h"
#include "wide-int.h"
#include "inchash.h"
#include "tree.h"
#include "fold-const.h"
#include "predict.h"
#include "hard-reg-set.h"
#include "input.h"
#include "function.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 "hash-map.h"
#include "plugin-api.h"
#include "ipa-ref.h"
#include "cgraph.h"
#include "tree-streamer.h"
#include "lto-streamer.h"
#include "lto-section-names.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;
const char *section_name_prefix = LTO_SECTION_NAME_PREFIX;
/* Set when streaming LTO for offloading compiler. */
bool lto_stream_offload_p;
/* 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 (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)
{
#ifdef ENABLE_CHECKING
/* 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 ();
#endif
#ifdef LTO_STREAMER_DEBUG
tree_htab = new hash_table<tree_hash_entry> (31);
#endif
}
/* Gate function for all LTO streaming passes. */
bool
gate_lto_out (void)
{
return ((flag_generate_lto || flag_generate_offload || 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 (input_location,
"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;
}