| /* LTO IL compression streams. |
| |
| Copyright (C) 2009-2017 Free Software Foundation, Inc. |
| Contributed by Simon Baldwin <simonb@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 "backend.h" |
| #include "tree.h" |
| #include "gimple.h" |
| #include "cgraph.h" |
| #include "lto-streamer.h" |
| /* zlib.h includes other system headers. Those headers may test feature |
| test macros. config.h may define feature test macros. For this reason, |
| zlib.h needs to be included after, rather than before, config.h and |
| system.h. */ |
| #include <zlib.h> |
| #include "lto-compress.h" |
| #include "timevar.h" |
| |
| /* Compression stream structure, holds the flush callback and opaque token, |
| the buffered data, and a note of whether compressing or uncompressing. */ |
| |
| struct lto_compression_stream |
| { |
| void (*callback) (const char *, unsigned, void *); |
| void *opaque; |
| char *buffer; |
| size_t bytes; |
| size_t allocation; |
| bool is_compression; |
| }; |
| |
| /* Overall compression constants for zlib. */ |
| |
| static const size_t Z_BUFFER_LENGTH = 4096; |
| static const size_t MIN_STREAM_ALLOCATION = 1024; |
| |
| /* For zlib, allocate SIZE count of ITEMS and return the address, OPAQUE |
| is unused. */ |
| |
| static void * |
| lto_zalloc (void *opaque, unsigned items, unsigned size) |
| { |
| gcc_assert (opaque == Z_NULL); |
| return xmalloc (items * size); |
| } |
| |
| /* For zlib, free memory at ADDRESS, OPAQUE is unused. */ |
| |
| static void |
| lto_zfree (void *opaque, void *address) |
| { |
| gcc_assert (opaque == Z_NULL); |
| free (address); |
| } |
| |
| /* Return a zlib compression level that zlib will not reject. Normalizes |
| the compression level from the command line flag, clamping non-default |
| values to the appropriate end of their valid range. */ |
| |
| static int |
| lto_normalized_zlib_level (void) |
| { |
| int level = flag_lto_compression_level; |
| |
| if (level != Z_DEFAULT_COMPRESSION) |
| { |
| if (level < Z_NO_COMPRESSION) |
| level = Z_NO_COMPRESSION; |
| else if (level > Z_BEST_COMPRESSION) |
| level = Z_BEST_COMPRESSION; |
| } |
| |
| return level; |
| } |
| |
| /* Create a new compression stream, with CALLBACK flush function passed |
| OPAQUE token, IS_COMPRESSION indicates if compressing or uncompressing. */ |
| |
| static struct lto_compression_stream * |
| lto_new_compression_stream (void (*callback) (const char *, unsigned, void *), |
| void *opaque, bool is_compression) |
| { |
| struct lto_compression_stream *stream |
| = (struct lto_compression_stream *) xmalloc (sizeof (*stream)); |
| |
| memset (stream, 0, sizeof (*stream)); |
| stream->callback = callback; |
| stream->opaque = opaque; |
| stream->is_compression = is_compression; |
| |
| return stream; |
| } |
| |
| /* Append NUM_CHARS from address BASE to STREAM. */ |
| |
| static void |
| lto_append_to_compression_stream (struct lto_compression_stream *stream, |
| const char *base, size_t num_chars) |
| { |
| size_t required = stream->bytes + num_chars; |
| |
| if (stream->allocation < required) |
| { |
| if (stream->allocation == 0) |
| stream->allocation = MIN_STREAM_ALLOCATION; |
| while (stream->allocation < required) |
| stream->allocation *= 2; |
| |
| stream->buffer = (char *) xrealloc (stream->buffer, stream->allocation); |
| } |
| |
| memcpy (stream->buffer + stream->bytes, base, num_chars); |
| stream->bytes += num_chars; |
| } |
| |
| /* Free the buffer and memory associated with STREAM. */ |
| |
| static void |
| lto_destroy_compression_stream (struct lto_compression_stream *stream) |
| { |
| free (stream->buffer); |
| free (stream); |
| } |
| |
| /* Return a new compression stream, with CALLBACK flush function passed |
| OPAQUE token. */ |
| |
| struct lto_compression_stream * |
| lto_start_compression (void (*callback) (const char *, unsigned, void *), |
| void *opaque) |
| { |
| return lto_new_compression_stream (callback, opaque, true); |
| } |
| |
| /* Append NUM_CHARS from address BASE to STREAM. */ |
| |
| void |
| lto_compress_block (struct lto_compression_stream *stream, |
| const char *base, size_t num_chars) |
| { |
| gcc_assert (stream->is_compression); |
| |
| lto_append_to_compression_stream (stream, base, num_chars); |
| lto_stats.num_output_il_bytes += num_chars; |
| } |
| |
| /* Finalize STREAM compression, and free stream allocations. */ |
| |
| void |
| lto_end_compression (struct lto_compression_stream *stream) |
| { |
| unsigned char *cursor = (unsigned char *) stream->buffer; |
| size_t remaining = stream->bytes; |
| const size_t outbuf_length = Z_BUFFER_LENGTH; |
| unsigned char *outbuf = (unsigned char *) xmalloc (outbuf_length); |
| z_stream out_stream; |
| size_t compressed_bytes = 0; |
| int status; |
| |
| gcc_assert (stream->is_compression); |
| |
| timevar_push (TV_IPA_LTO_COMPRESS); |
| |
| out_stream.next_out = outbuf; |
| out_stream.avail_out = outbuf_length; |
| out_stream.next_in = cursor; |
| out_stream.avail_in = remaining; |
| out_stream.zalloc = lto_zalloc; |
| out_stream.zfree = lto_zfree; |
| out_stream.opaque = Z_NULL; |
| |
| status = deflateInit (&out_stream, lto_normalized_zlib_level ()); |
| if (status != Z_OK) |
| internal_error ("compressed stream: %s", zError (status)); |
| |
| do |
| { |
| size_t in_bytes, out_bytes; |
| |
| status = deflate (&out_stream, Z_FINISH); |
| if (status != Z_OK && status != Z_STREAM_END) |
| internal_error ("compressed stream: %s", zError (status)); |
| |
| in_bytes = remaining - out_stream.avail_in; |
| out_bytes = outbuf_length - out_stream.avail_out; |
| |
| stream->callback ((const char *) outbuf, out_bytes, stream->opaque); |
| lto_stats.num_compressed_il_bytes += out_bytes; |
| compressed_bytes += out_bytes; |
| |
| cursor += in_bytes; |
| remaining -= in_bytes; |
| |
| out_stream.next_out = outbuf; |
| out_stream.avail_out = outbuf_length; |
| out_stream.next_in = cursor; |
| out_stream.avail_in = remaining; |
| } |
| while (status != Z_STREAM_END); |
| |
| status = deflateEnd (&out_stream); |
| if (status != Z_OK) |
| internal_error ("compressed stream: %s", zError (status)); |
| |
| lto_destroy_compression_stream (stream); |
| free (outbuf); |
| timevar_pop (TV_IPA_LTO_COMPRESS); |
| } |
| |
| /* Return a new uncompression stream, with CALLBACK flush function passed |
| OPAQUE token. */ |
| |
| struct lto_compression_stream * |
| lto_start_uncompression (void (*callback) (const char *, unsigned, void *), |
| void *opaque) |
| { |
| return lto_new_compression_stream (callback, opaque, false); |
| } |
| |
| /* Append NUM_CHARS from address BASE to STREAM. */ |
| |
| void |
| lto_uncompress_block (struct lto_compression_stream *stream, |
| const char *base, size_t num_chars) |
| { |
| gcc_assert (!stream->is_compression); |
| |
| lto_append_to_compression_stream (stream, base, num_chars); |
| lto_stats.num_input_il_bytes += num_chars; |
| } |
| |
| /* Finalize STREAM uncompression, and free stream allocations. |
| |
| Because of the way LTO IL streams are compressed, there may be several |
| concatenated compressed segments in the accumulated data, so for this |
| function we iterate decompressions until no data remains. */ |
| |
| void |
| lto_end_uncompression (struct lto_compression_stream *stream) |
| { |
| unsigned char *cursor = (unsigned char *) stream->buffer; |
| size_t remaining = stream->bytes; |
| const size_t outbuf_length = Z_BUFFER_LENGTH; |
| unsigned char *outbuf = (unsigned char *) xmalloc (outbuf_length); |
| size_t uncompressed_bytes = 0; |
| |
| gcc_assert (!stream->is_compression); |
| timevar_push (TV_IPA_LTO_DECOMPRESS); |
| |
| while (remaining > 0) |
| { |
| z_stream in_stream; |
| size_t out_bytes; |
| int status; |
| |
| in_stream.next_out = outbuf; |
| in_stream.avail_out = outbuf_length; |
| in_stream.next_in = cursor; |
| in_stream.avail_in = remaining; |
| in_stream.zalloc = lto_zalloc; |
| in_stream.zfree = lto_zfree; |
| in_stream.opaque = Z_NULL; |
| |
| status = inflateInit (&in_stream); |
| if (status != Z_OK) |
| internal_error ("compressed stream: %s", zError (status)); |
| |
| do |
| { |
| size_t in_bytes; |
| |
| status = inflate (&in_stream, Z_SYNC_FLUSH); |
| if (status != Z_OK && status != Z_STREAM_END) |
| internal_error ("compressed stream: %s", zError (status)); |
| |
| in_bytes = remaining - in_stream.avail_in; |
| out_bytes = outbuf_length - in_stream.avail_out; |
| |
| stream->callback ((const char *) outbuf, out_bytes, stream->opaque); |
| lto_stats.num_uncompressed_il_bytes += out_bytes; |
| uncompressed_bytes += out_bytes; |
| |
| cursor += in_bytes; |
| remaining -= in_bytes; |
| |
| in_stream.next_out = outbuf; |
| in_stream.avail_out = outbuf_length; |
| in_stream.next_in = cursor; |
| in_stream.avail_in = remaining; |
| } |
| while (!(status == Z_STREAM_END && out_bytes == 0)); |
| |
| status = inflateEnd (&in_stream); |
| if (status != Z_OK) |
| internal_error ("compressed stream: %s", zError (status)); |
| } |
| |
| lto_destroy_compression_stream (stream); |
| free (outbuf); |
| timevar_pop (TV_IPA_LTO_DECOMPRESS); |
| } |