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jeremybenn |
/* Functions for writing LTO sections.
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Copyright (C) 2009, 2010 Free Software Foundation, Inc.
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Contributed by Kenneth Zadeck <zadeck@naturalbridge.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "tree.h"
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#include "expr.h"
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#include "params.h"
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#include "input.h"
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#include "hashtab.h"
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#include "basic-block.h"
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#include "tree-flow.h"
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#include "tree-pass.h"
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#include "cgraph.h"
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#include "function.h"
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#include "ggc.h"
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#include "except.h"
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#include "vec.h"
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#include "pointer-set.h"
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#include "bitmap.h"
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#include "langhooks.h"
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#include "data-streamer.h"
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#include "lto-streamer.h"
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#include "lto-compress.h"
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static VEC(lto_out_decl_state_ptr, heap) *decl_state_stack;
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/* List of out decl states used by functions. We use this to
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generate the decl directory later. */
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VEC(lto_out_decl_state_ptr, heap) *lto_function_decl_states;
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/* Returns a hash code for P. */
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hashval_t
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lto_hash_decl_slot_node (const void *p)
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{
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const struct lto_decl_slot *ds = (const struct lto_decl_slot *) p;
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/*
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return (hashval_t) DECL_UID (ds->t);
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*/
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return (hashval_t) TREE_HASH (ds->t);
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}
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/* Returns nonzero if P1 and P2 are equal. */
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int
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lto_eq_decl_slot_node (const void *p1, const void *p2)
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{
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const struct lto_decl_slot *ds1 =
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(const struct lto_decl_slot *) p1;
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const struct lto_decl_slot *ds2 =
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(const struct lto_decl_slot *) p2;
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/*
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return DECL_UID (ds1->t) == DECL_UID (ds2->t);
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*/
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return ds1->t == ds2->t;
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}
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/* Returns a hash code for P. */
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hashval_t
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lto_hash_type_slot_node (const void *p)
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{
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const struct lto_decl_slot *ds = (const struct lto_decl_slot *) p;
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return (hashval_t) TYPE_UID (ds->t);
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}
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/* Returns nonzero if P1 and P2 are equal. */
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int
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lto_eq_type_slot_node (const void *p1, const void *p2)
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{
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const struct lto_decl_slot *ds1 =
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(const struct lto_decl_slot *) p1;
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const struct lto_decl_slot *ds2 =
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(const struct lto_decl_slot *) p2;
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return TYPE_UID (ds1->t) == TYPE_UID (ds2->t);
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}
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/*****************************************************************************
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Output routines shared by all of the serialization passes.
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*****************************************************************************/
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/* Flush compressed stream data function, sends NUM_CHARS from CHARS
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to the append lang hook, OPAQUE is currently always NULL. */
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static void
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lto_append_data (const char *chars, unsigned int num_chars, void *opaque)
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{
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gcc_assert (opaque == NULL);
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lang_hooks.lto.append_data (chars, num_chars, opaque);
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}
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/* Pointer to the current compression stream. */
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static struct lto_compression_stream *compression_stream = NULL;
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/* Begin a new output section named NAME. If COMPRESS is true, zlib compress
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the section. */
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void
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lto_begin_section (const char *name, bool compress)
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{
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lang_hooks.lto.begin_section (name);
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/* FIXME lto: for now, suppress compression if the lang_hook that appends
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data is anything other than assembler output. The effect here is that
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we get compression of IL only in non-ltrans object files. */
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gcc_assert (compression_stream == NULL);
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if (compress)
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compression_stream = lto_start_compression (lto_append_data, NULL);
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}
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/* End the current output section. */
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void
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lto_end_section (void)
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{
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if (compression_stream)
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{
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lto_end_compression (compression_stream);
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compression_stream = NULL;
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}
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lang_hooks.lto.end_section ();
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}
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/* Write all of the chars in OBS to the assembler. Recycle the blocks
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in obs as this is being done. */
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void
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lto_write_stream (struct lto_output_stream *obs)
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{
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unsigned int block_size = 1024;
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struct lto_char_ptr_base *block;
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struct lto_char_ptr_base *next_block;
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if (!obs->first_block)
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return;
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for (block = obs->first_block; block; block = next_block)
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{
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const char *base = ((char *)block) + sizeof (struct lto_char_ptr_base);
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unsigned int num_chars = block_size - sizeof (struct lto_char_ptr_base);
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/* If this is not the last block, it is full. If it is the last
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block, left_in_block indicates how many chars are unoccupied in
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this block; subtract from num_chars to obtain occupancy. */
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next_block = (struct lto_char_ptr_base *) block->ptr;
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if (!next_block)
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num_chars -= obs->left_in_block;
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/* FIXME lto: WPA mode uses an ELF function as a lang_hook to append
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output data. This hook is not happy with the way that compression
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blocks up output differently to the way it's blocked here. So for
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now, we don't compress WPA output. */
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if (compression_stream)
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{
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lto_compress_block (compression_stream, base, num_chars);
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lang_hooks.lto.append_data (NULL, 0, block);
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}
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else
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lang_hooks.lto.append_data (base, num_chars, block);
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block_size *= 2;
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}
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}
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/* Adds a new block to output stream OBS. */
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void
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lto_append_block (struct lto_output_stream *obs)
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{
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struct lto_char_ptr_base *new_block;
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gcc_assert (obs->left_in_block == 0);
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if (obs->first_block == NULL)
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{
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/* This is the first time the stream has been written
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into. */
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obs->block_size = 1024;
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new_block = (struct lto_char_ptr_base*) xmalloc (obs->block_size);
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obs->first_block = new_block;
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}
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else
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{
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struct lto_char_ptr_base *tptr;
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/* Get a new block that is twice as big as the last block
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and link it into the list. */
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obs->block_size *= 2;
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new_block = (struct lto_char_ptr_base*) xmalloc (obs->block_size);
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/* The first bytes of the block are reserved as a pointer to
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the next block. Set the chain of the full block to the
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pointer to the new block. */
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tptr = obs->current_block;
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tptr->ptr = (char *) new_block;
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}
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/* Set the place for the next char at the first position after the
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chain to the next block. */
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obs->current_pointer
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= ((char *) new_block) + sizeof (struct lto_char_ptr_base);
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obs->current_block = new_block;
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/* Null out the newly allocated block's pointer to the next block. */
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new_block->ptr = NULL;
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obs->left_in_block = obs->block_size - sizeof (struct lto_char_ptr_base);
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}
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/* Write raw DATA of length LEN to the output block OB. */
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void
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lto_output_data_stream (struct lto_output_stream *obs, const void *data,
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size_t len)
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{
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while (len)
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{
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size_t copy;
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/* No space left. */
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if (obs->left_in_block == 0)
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lto_append_block (obs);
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/* Determine how many bytes to copy in this loop. */
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if (len <= obs->left_in_block)
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copy = len;
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else
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copy = obs->left_in_block;
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/* Copy the data and do bookkeeping. */
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memcpy (obs->current_pointer, data, copy);
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obs->current_pointer += copy;
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obs->total_size += copy;
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obs->left_in_block -= copy;
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data = (const char *) data + copy;
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len -= copy;
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}
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}
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/* Lookup NAME in ENCODER. If NAME is not found, create a new entry in
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ENCODER for NAME with the next available index of ENCODER, then
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print the index to OBS. True is returned if NAME was added to
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ENCODER. The resulting index is stored in THIS_INDEX.
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If OBS is NULL, the only action is to add NAME to the encoder. */
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bool
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lto_output_decl_index (struct lto_output_stream *obs,
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struct lto_tree_ref_encoder *encoder,
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tree name, unsigned int *this_index)
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{
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void **slot;
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struct lto_decl_slot d_slot;
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int index;
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bool new_entry_p = FALSE;
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d_slot.t = name;
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slot = htab_find_slot (encoder->tree_hash_table, &d_slot, INSERT);
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if (*slot == NULL)
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{
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struct lto_decl_slot *new_slot
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= (struct lto_decl_slot *) xmalloc (sizeof (struct lto_decl_slot));
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index = encoder->next_index++;
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new_slot->t = name;
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new_slot->slot_num = index;
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*slot = new_slot;
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VEC_safe_push (tree, heap, encoder->trees, name);
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new_entry_p = TRUE;
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}
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else
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{
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struct lto_decl_slot *old_slot = (struct lto_decl_slot *)*slot;
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index = old_slot->slot_num;
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}
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if (obs)
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streamer_write_uhwi_stream (obs, index);
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*this_index = index;
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return new_entry_p;
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}
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/* Output a field DECL to OBS. */
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void
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lto_output_field_decl_index (struct lto_out_decl_state *decl_state,
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struct lto_output_stream * obs, tree decl)
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{
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unsigned int index;
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lto_output_decl_index (obs, &decl_state->streams[LTO_DECL_STREAM_FIELD_DECL],
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decl, &index);
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}
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/* Output a function DECL to OBS. */
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void
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lto_output_fn_decl_index (struct lto_out_decl_state *decl_state,
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struct lto_output_stream * obs, tree decl)
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{
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unsigned int index;
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lto_output_decl_index (obs, &decl_state->streams[LTO_DECL_STREAM_FN_DECL],
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decl, &index);
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}
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/* Output a namespace DECL to OBS. */
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void
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lto_output_namespace_decl_index (struct lto_out_decl_state *decl_state,
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struct lto_output_stream * obs, tree decl)
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{
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unsigned int index;
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lto_output_decl_index (obs,
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&decl_state->streams[LTO_DECL_STREAM_NAMESPACE_DECL],
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decl, &index);
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}
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/* Output a static or extern var DECL to OBS. */
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void
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lto_output_var_decl_index (struct lto_out_decl_state *decl_state,
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struct lto_output_stream * obs, tree decl)
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{
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unsigned int index;
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353 |
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lto_output_decl_index (obs, &decl_state->streams[LTO_DECL_STREAM_VAR_DECL],
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decl, &index);
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}
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/* Output a type DECL to OBS. */
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void
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lto_output_type_decl_index (struct lto_out_decl_state *decl_state,
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361 |
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struct lto_output_stream * obs, tree decl)
|
362 |
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{
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363 |
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unsigned int index;
|
364 |
|
|
lto_output_decl_index (obs, &decl_state->streams[LTO_DECL_STREAM_TYPE_DECL],
|
365 |
|
|
decl, &index);
|
366 |
|
|
}
|
367 |
|
|
|
368 |
|
|
/* Output a type REF to OBS. */
|
369 |
|
|
|
370 |
|
|
void
|
371 |
|
|
lto_output_type_ref_index (struct lto_out_decl_state *decl_state,
|
372 |
|
|
struct lto_output_stream *obs, tree ref)
|
373 |
|
|
{
|
374 |
|
|
unsigned int index;
|
375 |
|
|
lto_output_decl_index (obs, &decl_state->streams[LTO_DECL_STREAM_TYPE],
|
376 |
|
|
ref, &index);
|
377 |
|
|
}
|
378 |
|
|
|
379 |
|
|
|
380 |
|
|
/* Create the output block and return it. */
|
381 |
|
|
|
382 |
|
|
struct lto_simple_output_block *
|
383 |
|
|
lto_create_simple_output_block (enum lto_section_type section_type)
|
384 |
|
|
{
|
385 |
|
|
struct lto_simple_output_block *ob
|
386 |
|
|
= ((struct lto_simple_output_block *)
|
387 |
|
|
xcalloc (1, sizeof (struct lto_simple_output_block)));
|
388 |
|
|
|
389 |
|
|
ob->section_type = section_type;
|
390 |
|
|
ob->decl_state = lto_get_out_decl_state ();
|
391 |
|
|
ob->main_stream = ((struct lto_output_stream *)
|
392 |
|
|
xcalloc (1, sizeof (struct lto_output_stream)));
|
393 |
|
|
|
394 |
|
|
return ob;
|
395 |
|
|
}
|
396 |
|
|
|
397 |
|
|
|
398 |
|
|
/* Produce a simple section for one of the ipa passes. */
|
399 |
|
|
|
400 |
|
|
void
|
401 |
|
|
lto_destroy_simple_output_block (struct lto_simple_output_block *ob)
|
402 |
|
|
{
|
403 |
|
|
char *section_name;
|
404 |
|
|
struct lto_simple_header header;
|
405 |
|
|
struct lto_output_stream *header_stream;
|
406 |
|
|
|
407 |
|
|
section_name = lto_get_section_name (ob->section_type, NULL, NULL);
|
408 |
|
|
lto_begin_section (section_name, !flag_wpa);
|
409 |
|
|
free (section_name);
|
410 |
|
|
|
411 |
|
|
/* Write the header which says how to decode the pieces of the
|
412 |
|
|
t. */
|
413 |
|
|
memset (&header, 0, sizeof (struct lto_simple_header));
|
414 |
|
|
header.lto_header.major_version = LTO_major_version;
|
415 |
|
|
header.lto_header.minor_version = LTO_minor_version;
|
416 |
|
|
header.lto_header.section_type = LTO_section_cgraph;
|
417 |
|
|
|
418 |
|
|
header.compressed_size = 0;
|
419 |
|
|
|
420 |
|
|
header.main_size = ob->main_stream->total_size;
|
421 |
|
|
|
422 |
|
|
header_stream = XCNEW (struct lto_output_stream);
|
423 |
|
|
lto_output_data_stream (header_stream, &header, sizeof header);
|
424 |
|
|
lto_write_stream (header_stream);
|
425 |
|
|
free (header_stream);
|
426 |
|
|
|
427 |
|
|
lto_write_stream (ob->main_stream);
|
428 |
|
|
|
429 |
|
|
/* Put back the assembly section that was there before we started
|
430 |
|
|
writing lto info. */
|
431 |
|
|
lto_end_section ();
|
432 |
|
|
|
433 |
|
|
free (ob->main_stream);
|
434 |
|
|
free (ob);
|
435 |
|
|
}
|
436 |
|
|
|
437 |
|
|
|
438 |
|
|
/* Return a new lto_out_decl_state. */
|
439 |
|
|
|
440 |
|
|
struct lto_out_decl_state *
|
441 |
|
|
lto_new_out_decl_state (void)
|
442 |
|
|
{
|
443 |
|
|
struct lto_out_decl_state *state = XCNEW (struct lto_out_decl_state);
|
444 |
|
|
int i;
|
445 |
|
|
htab_hash hash_fn;
|
446 |
|
|
htab_eq eq_fn;
|
447 |
|
|
|
448 |
|
|
for (i = 0; i < LTO_N_DECL_STREAMS; i++)
|
449 |
|
|
{
|
450 |
|
|
if (i == LTO_DECL_STREAM_TYPE)
|
451 |
|
|
{
|
452 |
|
|
hash_fn = lto_hash_type_slot_node;
|
453 |
|
|
eq_fn = lto_eq_type_slot_node;
|
454 |
|
|
}
|
455 |
|
|
else
|
456 |
|
|
{
|
457 |
|
|
hash_fn = lto_hash_decl_slot_node;
|
458 |
|
|
eq_fn = lto_eq_decl_slot_node;
|
459 |
|
|
}
|
460 |
|
|
lto_init_tree_ref_encoder (&state->streams[i], hash_fn, eq_fn);
|
461 |
|
|
}
|
462 |
|
|
|
463 |
|
|
return state;
|
464 |
|
|
}
|
465 |
|
|
|
466 |
|
|
|
467 |
|
|
/* Delete STATE and components. */
|
468 |
|
|
|
469 |
|
|
void
|
470 |
|
|
lto_delete_out_decl_state (struct lto_out_decl_state *state)
|
471 |
|
|
{
|
472 |
|
|
int i;
|
473 |
|
|
|
474 |
|
|
for (i = 0; i < LTO_N_DECL_STREAMS; i++)
|
475 |
|
|
lto_destroy_tree_ref_encoder (&state->streams[i]);
|
476 |
|
|
|
477 |
|
|
free (state);
|
478 |
|
|
}
|
479 |
|
|
|
480 |
|
|
|
481 |
|
|
/* Get the currently used lto_out_decl_state structure. */
|
482 |
|
|
|
483 |
|
|
struct lto_out_decl_state *
|
484 |
|
|
lto_get_out_decl_state (void)
|
485 |
|
|
{
|
486 |
|
|
return VEC_last (lto_out_decl_state_ptr, decl_state_stack);
|
487 |
|
|
}
|
488 |
|
|
|
489 |
|
|
/* Push STATE to top of out decl stack. */
|
490 |
|
|
|
491 |
|
|
void
|
492 |
|
|
lto_push_out_decl_state (struct lto_out_decl_state *state)
|
493 |
|
|
{
|
494 |
|
|
VEC_safe_push (lto_out_decl_state_ptr, heap, decl_state_stack, state);
|
495 |
|
|
}
|
496 |
|
|
|
497 |
|
|
/* Pop the currently used out-decl state from top of stack. */
|
498 |
|
|
|
499 |
|
|
struct lto_out_decl_state *
|
500 |
|
|
lto_pop_out_decl_state (void)
|
501 |
|
|
{
|
502 |
|
|
return VEC_pop (lto_out_decl_state_ptr, decl_state_stack);
|
503 |
|
|
}
|
504 |
|
|
|
505 |
|
|
/* Record STATE after it has been used in serializing the body of
|
506 |
|
|
FN_DECL. STATE should no longer be used by the caller. The ownership
|
507 |
|
|
of it is taken over from this point. */
|
508 |
|
|
|
509 |
|
|
void
|
510 |
|
|
lto_record_function_out_decl_state (tree fn_decl,
|
511 |
|
|
struct lto_out_decl_state *state)
|
512 |
|
|
{
|
513 |
|
|
int i;
|
514 |
|
|
|
515 |
|
|
/* Strip all hash tables to save some memory. */
|
516 |
|
|
for (i = 0; i < LTO_N_DECL_STREAMS; i++)
|
517 |
|
|
if (state->streams[i].tree_hash_table)
|
518 |
|
|
{
|
519 |
|
|
htab_delete (state->streams[i].tree_hash_table);
|
520 |
|
|
state->streams[i].tree_hash_table = NULL;
|
521 |
|
|
}
|
522 |
|
|
state->fn_decl = fn_decl;
|
523 |
|
|
VEC_safe_push (lto_out_decl_state_ptr, heap, lto_function_decl_states,
|
524 |
|
|
state);
|
525 |
|
|
}
|