272 lines
7.1 KiB
C++
272 lines
7.1 KiB
C++
/* Functions for writing LTO sections.
|
|
|
|
Copyright (C) 2009-2022 Free Software Foundation, Inc.
|
|
Contributed by Kenneth Zadeck <zadeck@naturalbridge.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 "backend.h"
|
|
#include "rtl.h"
|
|
#include "tree.h"
|
|
#include "gimple.h"
|
|
#include "cgraph.h"
|
|
#include "data-streamer.h"
|
|
#include "langhooks.h"
|
|
#include "lto-compress.h"
|
|
#include "print-tree.h"
|
|
|
|
static vec<lto_out_decl_state_ptr> decl_state_stack;
|
|
|
|
/* List of out decl states used by functions. We use this to
|
|
generate the decl directory later. */
|
|
|
|
vec<lto_out_decl_state_ptr> lto_function_decl_states;
|
|
|
|
|
|
/*****************************************************************************
|
|
Output routines shared by all of the serialization passes.
|
|
*****************************************************************************/
|
|
|
|
|
|
/* Flush compressed stream data function, sends NUM_CHARS from CHARS
|
|
to the append lang hook, OPAQUE is currently always NULL. */
|
|
|
|
static void
|
|
lto_append_data (const char *chars, unsigned int num_chars, void *opaque)
|
|
{
|
|
gcc_assert (opaque == NULL);
|
|
lang_hooks.lto.append_data (chars, num_chars, opaque);
|
|
}
|
|
|
|
/* Pointer to the current compression stream. */
|
|
|
|
static struct lto_compression_stream *compression_stream = NULL;
|
|
|
|
/* Begin a new output section named NAME. If COMPRESS is true, zlib compress
|
|
the section. */
|
|
|
|
void
|
|
lto_begin_section (const char *name, bool compress)
|
|
{
|
|
lang_hooks.lto.begin_section (name);
|
|
|
|
if (streamer_dump_file)
|
|
{
|
|
if (flag_dump_unnumbered || flag_dump_noaddr)
|
|
fprintf (streamer_dump_file, "Creating %ssection\n",
|
|
compress ? "compressed " : "");
|
|
else
|
|
fprintf (streamer_dump_file, "Creating %ssection %s\n",
|
|
compress ? "compressed " : "", name);
|
|
}
|
|
gcc_assert (compression_stream == NULL);
|
|
if (compress)
|
|
compression_stream = lto_start_compression (lto_append_data, NULL);
|
|
}
|
|
|
|
|
|
/* End the current output section. */
|
|
|
|
void
|
|
lto_end_section (void)
|
|
{
|
|
if (compression_stream)
|
|
{
|
|
lto_end_compression (compression_stream);
|
|
compression_stream = NULL;
|
|
}
|
|
lang_hooks.lto.end_section ();
|
|
}
|
|
|
|
/* Write SIZE bytes starting at DATA to the assembler. */
|
|
|
|
void
|
|
lto_write_data (const void *data, unsigned int size)
|
|
{
|
|
if (compression_stream)
|
|
lto_compress_block (compression_stream, (const char *)data, size);
|
|
else
|
|
lang_hooks.lto.append_data ((const char *)data, size, NULL);
|
|
}
|
|
|
|
/* Write SIZE bytes starting at DATA to the assembler. */
|
|
|
|
void
|
|
lto_write_raw_data (const void *data, unsigned int size)
|
|
{
|
|
lang_hooks.lto.append_data ((const char *)data, size, NULL);
|
|
}
|
|
|
|
/* Write all of the chars in OBS to the assembler. Recycle the blocks
|
|
in obs as this is being done. */
|
|
|
|
void
|
|
lto_write_stream (struct lto_output_stream *obs)
|
|
{
|
|
unsigned int block_size = 1024;
|
|
struct lto_char_ptr_base *block;
|
|
struct lto_char_ptr_base *next_block;
|
|
if (!obs->first_block)
|
|
return;
|
|
|
|
for (block = obs->first_block; block; block = next_block)
|
|
{
|
|
const char *base = ((char *)block) + sizeof (struct lto_char_ptr_base);
|
|
unsigned int num_chars = block_size - sizeof (struct lto_char_ptr_base);
|
|
|
|
/* If this is not the last block, it is full. If it is the last
|
|
block, left_in_block indicates how many chars are unoccupied in
|
|
this block; subtract from num_chars to obtain occupancy. */
|
|
next_block = (struct lto_char_ptr_base *) block->ptr;
|
|
if (!next_block)
|
|
num_chars -= obs->left_in_block;
|
|
|
|
if (compression_stream)
|
|
lto_compress_block (compression_stream, base, num_chars);
|
|
else
|
|
lang_hooks.lto.append_data (base, num_chars, block);
|
|
free (block);
|
|
block_size *= 2;
|
|
}
|
|
}
|
|
|
|
/* Create the output block and return it. */
|
|
|
|
struct lto_simple_output_block *
|
|
lto_create_simple_output_block (enum lto_section_type section_type)
|
|
{
|
|
struct lto_simple_output_block *ob
|
|
= ((struct lto_simple_output_block *)
|
|
xcalloc (1, sizeof (struct lto_simple_output_block)));
|
|
|
|
ob->section_type = section_type;
|
|
ob->decl_state = lto_get_out_decl_state ();
|
|
ob->main_stream = ((struct lto_output_stream *)
|
|
xcalloc (1, sizeof (struct lto_output_stream)));
|
|
|
|
return ob;
|
|
}
|
|
|
|
|
|
/* Produce a simple section for one of the ipa passes. */
|
|
|
|
void
|
|
lto_destroy_simple_output_block (struct lto_simple_output_block *ob)
|
|
{
|
|
char *section_name;
|
|
struct lto_simple_header header;
|
|
|
|
section_name = lto_get_section_name (ob->section_type, NULL, 0, NULL);
|
|
lto_begin_section (section_name, !flag_wpa);
|
|
free (section_name);
|
|
|
|
/* Write the header which says how to decode the pieces of the
|
|
t. */
|
|
memset (&header, 0, sizeof (struct lto_simple_header));
|
|
header.main_size = ob->main_stream->total_size;
|
|
lto_write_data (&header, sizeof header);
|
|
|
|
lto_write_stream (ob->main_stream);
|
|
|
|
/* Put back the assembly section that was there before we started
|
|
writing lto info. */
|
|
lto_end_section ();
|
|
|
|
free (ob->main_stream);
|
|
free (ob);
|
|
}
|
|
|
|
|
|
/* Return a new lto_out_decl_state. */
|
|
|
|
struct lto_out_decl_state *
|
|
lto_new_out_decl_state (void)
|
|
{
|
|
struct lto_out_decl_state *state = XCNEW (struct lto_out_decl_state);
|
|
int i;
|
|
|
|
for (i = 0; i < LTO_N_DECL_STREAMS; i++)
|
|
lto_init_tree_ref_encoder (&state->streams[i]);
|
|
|
|
/* At WPA time we do not compress sections by default. */
|
|
state->compressed = !flag_wpa;
|
|
|
|
return state;
|
|
}
|
|
|
|
|
|
/* Delete STATE and components. */
|
|
|
|
void
|
|
lto_delete_out_decl_state (struct lto_out_decl_state *state)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < LTO_N_DECL_STREAMS; i++)
|
|
lto_destroy_tree_ref_encoder (&state->streams[i]);
|
|
|
|
free (state);
|
|
}
|
|
|
|
|
|
/* Get the currently used lto_out_decl_state structure. */
|
|
|
|
struct lto_out_decl_state *
|
|
lto_get_out_decl_state (void)
|
|
{
|
|
return decl_state_stack.last ();
|
|
}
|
|
|
|
/* Push STATE to top of out decl stack. */
|
|
|
|
void
|
|
lto_push_out_decl_state (struct lto_out_decl_state *state)
|
|
{
|
|
decl_state_stack.safe_push (state);
|
|
}
|
|
|
|
/* Pop the currently used out-decl state from top of stack. */
|
|
|
|
struct lto_out_decl_state *
|
|
lto_pop_out_decl_state (void)
|
|
{
|
|
return decl_state_stack.pop ();
|
|
}
|
|
|
|
/* Record STATE after it has been used in serializing the body of
|
|
FN_DECL. STATE should no longer be used by the caller. The ownership
|
|
of it is taken over from this point. */
|
|
|
|
void
|
|
lto_record_function_out_decl_state (tree fn_decl,
|
|
struct lto_out_decl_state *state)
|
|
{
|
|
int i;
|
|
|
|
/* Strip all hash tables to save some memory. */
|
|
for (i = 0; i < LTO_N_DECL_STREAMS; i++)
|
|
if (state->streams[i].tree_hash_table)
|
|
{
|
|
delete state->streams[i].tree_hash_table;
|
|
state->streams[i].tree_hash_table = NULL;
|
|
}
|
|
state->fn_decl = fn_decl;
|
|
lto_function_decl_states.safe_push (state);
|
|
}
|