404 lines
11 KiB
C
404 lines
11 KiB
C
/* Routines for saving various data types to a file stream. This deals
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with various data types like strings, integers, enums, etc.
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Copyright (C) 2011-2019 Free Software Foundation, Inc.
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Contributed by Diego Novillo <dnovillo@google.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 "backend.h"
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#include "tree.h"
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#include "gimple.h"
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#include "cgraph.h"
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#include "data-streamer.h"
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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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/* Return index used to reference STRING of LEN characters in the string table
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in OB. The string might or might not include a trailing '\0'.
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Then put the index onto the INDEX_STREAM.
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When PERSISTENT is set, the string S is supposed to not change during
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duration of the OB and thus OB can keep pointer into it. */
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static unsigned
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streamer_string_index (struct output_block *ob, const char *s, unsigned int len,
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bool persistent)
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{
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struct string_slot **slot;
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struct string_slot s_slot;
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s_slot.s = s;
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s_slot.len = len;
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s_slot.slot_num = 0;
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slot = ob->string_hash_table->find_slot (&s_slot, INSERT);
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if (*slot == NULL)
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{
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struct lto_output_stream *string_stream = ob->string_stream;
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unsigned int start = string_stream->total_size;
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struct string_slot *new_slot = XOBNEW (&ob->obstack, struct string_slot);
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const char *string;
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if (!persistent)
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{
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char *tmp;
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string = tmp = XOBNEWVEC (&ob->obstack, char, len);
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memcpy (tmp, s, len);
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}
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else
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string = s;
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new_slot->s = string;
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new_slot->len = len;
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new_slot->slot_num = start;
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*slot = new_slot;
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streamer_write_uhwi_stream (string_stream, len);
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streamer_write_data_stream (string_stream, string, len);
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return start + 1;
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}
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else
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{
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struct string_slot *old_slot = *slot;
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return old_slot->slot_num + 1;
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}
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}
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/* Output STRING of LEN characters to the string table in OB. The
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string might or might not include a trailing '\0'. Then put the
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index onto the INDEX_STREAM.
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When PERSISTENT is set, the string S is supposed to not change during
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duration of the OB and thus OB can keep pointer into it. */
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void
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streamer_write_string_with_length (struct output_block *ob,
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struct lto_output_stream *index_stream,
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const char *s, unsigned int len,
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bool persistent)
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{
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if (s)
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streamer_write_uhwi_stream (index_stream,
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streamer_string_index (ob, s, len, persistent));
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else
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streamer_write_char_stream (index_stream, 0);
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}
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/* Output the '\0' terminated STRING to the string
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table in OB. Then put the index onto the INDEX_STREAM.
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When PERSISTENT is set, the string S is supposed to not change during
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duration of the OB and thus OB can keep pointer into it. */
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void
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streamer_write_string (struct output_block *ob,
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struct lto_output_stream *index_stream,
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const char *string, bool persistent)
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{
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if (string)
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streamer_write_string_with_length (ob, index_stream, string,
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strlen (string) + 1,
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persistent);
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else
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streamer_write_char_stream (index_stream, 0);
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}
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/* Output STRING of LEN characters to the string table in OB. Then
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put the index into BP.
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When PERSISTENT is set, the string S is supposed to not change during
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duration of the OB and thus OB can keep pointer into it. */
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void
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bp_pack_string_with_length (struct output_block *ob, struct bitpack_d *bp,
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const char *s, unsigned int len, bool persistent)
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{
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unsigned index = 0;
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if (s)
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index = streamer_string_index (ob, s, len, persistent);
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bp_pack_var_len_unsigned (bp, index);
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}
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/* Output the '\0' terminated STRING to the string
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table in OB. Then put the index onto the bitpack BP.
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When PERSISTENT is set, the string S is supposed to not change during
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duration of the OB and thus OB can keep pointer into it. */
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void
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bp_pack_string (struct output_block *ob, struct bitpack_d *bp,
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const char *s, bool persistent)
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{
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unsigned index = 0;
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if (s)
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index = streamer_string_index (ob, s, strlen (s) + 1, persistent);
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bp_pack_var_len_unsigned (bp, index);
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}
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/* Write a zero to the output stream. */
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void
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streamer_write_zero (struct output_block *ob)
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{
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streamer_write_char_stream (ob->main_stream, 0);
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}
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/* Write an unsigned HOST_WIDE_INT value WORK to OB->main_stream. */
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void
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streamer_write_uhwi (struct output_block *ob, unsigned HOST_WIDE_INT work)
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{
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streamer_write_uhwi_stream (ob->main_stream, work);
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}
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/* Write a HOST_WIDE_INT value WORK to OB->main_stream. */
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void
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streamer_write_hwi (struct output_block *ob, HOST_WIDE_INT work)
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{
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streamer_write_hwi_stream (ob->main_stream, work);
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}
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/* Write a gcov counter value WORK to OB->main_stream. */
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void
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streamer_write_gcov_count (struct output_block *ob, gcov_type work)
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{
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streamer_write_gcov_count_stream (ob->main_stream, work);
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}
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/* Write an unsigned HOST_WIDE_INT value WORK to OBS. */
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void
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streamer_write_uhwi_stream (struct lto_output_stream *obs,
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unsigned HOST_WIDE_INT work)
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{
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if (obs->left_in_block == 0)
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lto_append_block (obs);
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char *current_pointer = obs->current_pointer;
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unsigned int left_in_block = obs->left_in_block;
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unsigned int size = 0;
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do
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{
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unsigned int byte = (work & 0x7f);
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work >>= 7;
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if (work != 0)
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/* More bytes to follow. */
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byte |= 0x80;
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*(current_pointer++) = byte;
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left_in_block--;
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size++;
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}
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while (work != 0 && left_in_block > 0);
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if (work != 0)
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{
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obs->left_in_block = 0;
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lto_append_block (obs);
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current_pointer = obs->current_pointer;
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left_in_block = obs->left_in_block;
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do
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{
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unsigned int byte = (work & 0x7f);
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work >>= 7;
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if (work != 0)
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/* More bytes to follow. */
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byte |= 0x80;
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*(current_pointer++) = byte;
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left_in_block--;
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size++;
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}
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while (work != 0);
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}
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obs->current_pointer = current_pointer;
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obs->left_in_block = left_in_block;
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obs->total_size += size;
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}
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/* Write a HOST_WIDE_INT value WORK to OBS. */
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void
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streamer_write_hwi_stream (struct lto_output_stream *obs, HOST_WIDE_INT work)
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{
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if (obs->left_in_block == 0)
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lto_append_block (obs);
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char *current_pointer = obs->current_pointer;
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unsigned int left_in_block = obs->left_in_block;
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unsigned int size = 0;
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bool more;
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do
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{
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unsigned int byte = (work & 0x7f);
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/* If the lower 7-bits are sign-extended 0 or -1 we are finished. */
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work >>= 6;
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more = !(work == 0 || work == -1);
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if (more)
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{
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/* More bits to follow. */
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work >>= 1;
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byte |= 0x80;
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}
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*(current_pointer++) = byte;
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left_in_block--;
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size++;
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}
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while (more && left_in_block > 0);
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if (more)
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{
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obs->left_in_block = 0;
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lto_append_block (obs);
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current_pointer = obs->current_pointer;
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left_in_block = obs->left_in_block;
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do
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{
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unsigned int byte = (work & 0x7f);
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work >>= 6;
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more = !(work == 0 || work == -1);
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if (more)
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{
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work >>= 1;
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byte |= 0x80;
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}
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*(current_pointer++) = byte;
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left_in_block--;
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size++;
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}
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while (more);
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}
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obs->current_pointer = current_pointer;
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obs->left_in_block = left_in_block;
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obs->total_size += size;
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}
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/* Write a GCOV counter value WORK to OBS. */
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void
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streamer_write_gcov_count_stream (struct lto_output_stream *obs, gcov_type work)
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{
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gcc_assert ((HOST_WIDE_INT) work == work);
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streamer_write_hwi_stream (obs, work);
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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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streamer_write_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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/* Emit the physical representation of wide_int VAL to output block OB. */
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void
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streamer_write_wide_int (struct output_block *ob, const wide_int &val)
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{
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int len = val.get_len ();
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streamer_write_uhwi (ob, val.get_precision ());
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streamer_write_uhwi (ob, len);
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for (int i = 0; i < len; i++)
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streamer_write_hwi (ob, val.elt (i));
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}
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/* Emit the physical representation of widest_int W to output block OB. */
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void
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streamer_write_widest_int (struct output_block *ob,
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const widest_int &w)
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{
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int len = w.get_len ();
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streamer_write_uhwi (ob, w.get_precision ());
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streamer_write_uhwi (ob, len);
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for (int i = 0; i < len; i++)
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streamer_write_hwi (ob, w.elt (i));
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}
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