blob: fed581fafe13945de0a71397b111e02d5e2a9674 [file] [log] [blame]
/* Functions for writing LTO sections.
Copyright (C) 2009-2021 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);
}