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d7f09764 DN |
1 | /* LTO IL compression streams. |
2 | ||
818ab71a | 3 | Copyright (C) 2009-2016 Free Software Foundation, Inc. |
d7f09764 DN |
4 | Contributed by Simon Baldwin <simonb@google.com> |
5 | ||
6 | This file is part of GCC. | |
7 | ||
8 | GCC is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GCC is distributed in the hope that it will be useful, but WITHOUT | |
14 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
15 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
16 | License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GCC; see the file COPYING3. If not see | |
20 | <http://www.gnu.org/licenses/>. */ | |
21 | ||
22 | #include "config.h" | |
23 | #include "system.h" | |
957060b5 AM |
24 | #include "coretypes.h" |
25 | #include "backend.h" | |
957060b5 AM |
26 | #include "tree.h" |
27 | #include "gimple.h" | |
28 | #include "cgraph.h" | |
29 | #include "lto-streamer.h" | |
d7f09764 DN |
30 | /* zlib.h includes other system headers. Those headers may test feature |
31 | test macros. config.h may define feature test macros. For this reason, | |
32 | zlib.h needs to be included after, rather than before, config.h and | |
33 | system.h. */ | |
34 | #include <zlib.h> | |
d7f09764 | 35 | #include "lto-compress.h" |
ed7dc894 | 36 | #include "timevar.h" |
d7f09764 DN |
37 | |
38 | /* Compression stream structure, holds the flush callback and opaque token, | |
39 | the buffered data, and a note of whether compressing or uncompressing. */ | |
40 | ||
41 | struct lto_compression_stream | |
42 | { | |
43 | void (*callback) (const char *, unsigned, void *); | |
44 | void *opaque; | |
45 | char *buffer; | |
46 | size_t bytes; | |
47 | size_t allocation; | |
48 | bool is_compression; | |
49 | }; | |
50 | ||
51 | /* Overall compression constants for zlib. */ | |
52 | ||
53 | static const size_t Z_BUFFER_LENGTH = 4096; | |
54 | static const size_t MIN_STREAM_ALLOCATION = 1024; | |
55 | ||
56 | /* For zlib, allocate SIZE count of ITEMS and return the address, OPAQUE | |
57 | is unused. */ | |
58 | ||
59 | static void * | |
60 | lto_zalloc (void *opaque, unsigned items, unsigned size) | |
61 | { | |
62 | gcc_assert (opaque == Z_NULL); | |
63 | return xmalloc (items * size); | |
64 | } | |
65 | ||
66 | /* For zlib, free memory at ADDRESS, OPAQUE is unused. */ | |
67 | ||
68 | static void | |
69 | lto_zfree (void *opaque, void *address) | |
70 | { | |
71 | gcc_assert (opaque == Z_NULL); | |
72 | free (address); | |
73 | } | |
74 | ||
75 | /* Return a zlib compression level that zlib will not reject. Normalizes | |
76 | the compression level from the command line flag, clamping non-default | |
77 | values to the appropriate end of their valid range. */ | |
78 | ||
79 | static int | |
80 | lto_normalized_zlib_level (void) | |
81 | { | |
82 | int level = flag_lto_compression_level; | |
83 | ||
84 | if (level != Z_DEFAULT_COMPRESSION) | |
85 | { | |
86 | if (level < Z_NO_COMPRESSION) | |
87 | level = Z_NO_COMPRESSION; | |
88 | else if (level > Z_BEST_COMPRESSION) | |
89 | level = Z_BEST_COMPRESSION; | |
90 | } | |
91 | ||
92 | return level; | |
93 | } | |
94 | ||
95 | /* Create a new compression stream, with CALLBACK flush function passed | |
96 | OPAQUE token, IS_COMPRESSION indicates if compressing or uncompressing. */ | |
97 | ||
98 | static struct lto_compression_stream * | |
99 | lto_new_compression_stream (void (*callback) (const char *, unsigned, void *), | |
100 | void *opaque, bool is_compression) | |
101 | { | |
102 | struct lto_compression_stream *stream | |
103 | = (struct lto_compression_stream *) xmalloc (sizeof (*stream)); | |
104 | ||
105 | memset (stream, 0, sizeof (*stream)); | |
106 | stream->callback = callback; | |
107 | stream->opaque = opaque; | |
108 | stream->is_compression = is_compression; | |
109 | ||
110 | return stream; | |
111 | } | |
112 | ||
113 | /* Append NUM_CHARS from address BASE to STREAM. */ | |
114 | ||
115 | static void | |
116 | lto_append_to_compression_stream (struct lto_compression_stream *stream, | |
117 | const char *base, size_t num_chars) | |
118 | { | |
119 | size_t required = stream->bytes + num_chars; | |
120 | ||
121 | if (stream->allocation < required) | |
122 | { | |
123 | if (stream->allocation == 0) | |
124 | stream->allocation = MIN_STREAM_ALLOCATION; | |
125 | while (stream->allocation < required) | |
126 | stream->allocation *= 2; | |
127 | ||
128 | stream->buffer = (char *) xrealloc (stream->buffer, stream->allocation); | |
129 | } | |
130 | ||
131 | memcpy (stream->buffer + stream->bytes, base, num_chars); | |
132 | stream->bytes += num_chars; | |
133 | } | |
134 | ||
135 | /* Free the buffer and memory associated with STREAM. */ | |
136 | ||
137 | static void | |
138 | lto_destroy_compression_stream (struct lto_compression_stream *stream) | |
139 | { | |
140 | free (stream->buffer); | |
141 | free (stream); | |
142 | } | |
143 | ||
144 | /* Return a new compression stream, with CALLBACK flush function passed | |
145 | OPAQUE token. */ | |
146 | ||
147 | struct lto_compression_stream * | |
148 | lto_start_compression (void (*callback) (const char *, unsigned, void *), | |
149 | void *opaque) | |
150 | { | |
151 | return lto_new_compression_stream (callback, opaque, true); | |
152 | } | |
153 | ||
154 | /* Append NUM_CHARS from address BASE to STREAM. */ | |
155 | ||
156 | void | |
157 | lto_compress_block (struct lto_compression_stream *stream, | |
158 | const char *base, size_t num_chars) | |
159 | { | |
160 | gcc_assert (stream->is_compression); | |
161 | ||
162 | lto_append_to_compression_stream (stream, base, num_chars); | |
163 | lto_stats.num_output_il_bytes += num_chars; | |
164 | } | |
165 | ||
166 | /* Finalize STREAM compression, and free stream allocations. */ | |
167 | ||
168 | void | |
169 | lto_end_compression (struct lto_compression_stream *stream) | |
170 | { | |
171 | unsigned char *cursor = (unsigned char *) stream->buffer; | |
172 | size_t remaining = stream->bytes; | |
173 | const size_t outbuf_length = Z_BUFFER_LENGTH; | |
174 | unsigned char *outbuf = (unsigned char *) xmalloc (outbuf_length); | |
175 | z_stream out_stream; | |
176 | size_t compressed_bytes = 0; | |
177 | int status; | |
178 | ||
179 | gcc_assert (stream->is_compression); | |
180 | ||
ed7dc894 JH |
181 | timevar_push (TV_IPA_LTO_COMPRESS); |
182 | ||
d7f09764 DN |
183 | out_stream.next_out = outbuf; |
184 | out_stream.avail_out = outbuf_length; | |
185 | out_stream.next_in = cursor; | |
186 | out_stream.avail_in = remaining; | |
187 | out_stream.zalloc = lto_zalloc; | |
188 | out_stream.zfree = lto_zfree; | |
189 | out_stream.opaque = Z_NULL; | |
190 | ||
191 | status = deflateInit (&out_stream, lto_normalized_zlib_level ()); | |
192 | if (status != Z_OK) | |
193 | internal_error ("compressed stream: %s", zError (status)); | |
194 | ||
195 | do | |
196 | { | |
197 | size_t in_bytes, out_bytes; | |
198 | ||
199 | status = deflate (&out_stream, Z_FINISH); | |
200 | if (status != Z_OK && status != Z_STREAM_END) | |
201 | internal_error ("compressed stream: %s", zError (status)); | |
202 | ||
203 | in_bytes = remaining - out_stream.avail_in; | |
204 | out_bytes = outbuf_length - out_stream.avail_out; | |
205 | ||
206 | stream->callback ((const char *) outbuf, out_bytes, stream->opaque); | |
207 | lto_stats.num_compressed_il_bytes += out_bytes; | |
208 | compressed_bytes += out_bytes; | |
209 | ||
210 | cursor += in_bytes; | |
211 | remaining -= in_bytes; | |
212 | ||
213 | out_stream.next_out = outbuf; | |
214 | out_stream.avail_out = outbuf_length; | |
215 | out_stream.next_in = cursor; | |
216 | out_stream.avail_in = remaining; | |
217 | } | |
218 | while (status != Z_STREAM_END); | |
219 | ||
220 | status = deflateEnd (&out_stream); | |
221 | if (status != Z_OK) | |
222 | internal_error ("compressed stream: %s", zError (status)); | |
223 | ||
224 | lto_destroy_compression_stream (stream); | |
225 | free (outbuf); | |
ed7dc894 | 226 | timevar_pop (TV_IPA_LTO_COMPRESS); |
d7f09764 DN |
227 | } |
228 | ||
229 | /* Return a new uncompression stream, with CALLBACK flush function passed | |
230 | OPAQUE token. */ | |
231 | ||
232 | struct lto_compression_stream * | |
233 | lto_start_uncompression (void (*callback) (const char *, unsigned, void *), | |
234 | void *opaque) | |
235 | { | |
236 | return lto_new_compression_stream (callback, opaque, false); | |
237 | } | |
238 | ||
239 | /* Append NUM_CHARS from address BASE to STREAM. */ | |
240 | ||
241 | void | |
242 | lto_uncompress_block (struct lto_compression_stream *stream, | |
243 | const char *base, size_t num_chars) | |
244 | { | |
245 | gcc_assert (!stream->is_compression); | |
246 | ||
247 | lto_append_to_compression_stream (stream, base, num_chars); | |
248 | lto_stats.num_input_il_bytes += num_chars; | |
249 | } | |
250 | ||
251 | /* Finalize STREAM uncompression, and free stream allocations. | |
b8698a0f | 252 | |
d7f09764 DN |
253 | Because of the way LTO IL streams are compressed, there may be several |
254 | concatenated compressed segments in the accumulated data, so for this | |
255 | function we iterate decompressions until no data remains. */ | |
256 | ||
257 | void | |
258 | lto_end_uncompression (struct lto_compression_stream *stream) | |
259 | { | |
260 | unsigned char *cursor = (unsigned char *) stream->buffer; | |
261 | size_t remaining = stream->bytes; | |
262 | const size_t outbuf_length = Z_BUFFER_LENGTH; | |
263 | unsigned char *outbuf = (unsigned char *) xmalloc (outbuf_length); | |
264 | size_t uncompressed_bytes = 0; | |
265 | ||
266 | gcc_assert (!stream->is_compression); | |
ed7dc894 | 267 | timevar_push (TV_IPA_LTO_DECOMPRESS); |
d7f09764 DN |
268 | |
269 | while (remaining > 0) | |
270 | { | |
271 | z_stream in_stream; | |
272 | size_t out_bytes; | |
273 | int status; | |
274 | ||
275 | in_stream.next_out = outbuf; | |
276 | in_stream.avail_out = outbuf_length; | |
277 | in_stream.next_in = cursor; | |
278 | in_stream.avail_in = remaining; | |
279 | in_stream.zalloc = lto_zalloc; | |
280 | in_stream.zfree = lto_zfree; | |
281 | in_stream.opaque = Z_NULL; | |
282 | ||
283 | status = inflateInit (&in_stream); | |
284 | if (status != Z_OK) | |
285 | internal_error ("compressed stream: %s", zError (status)); | |
286 | ||
287 | do | |
288 | { | |
289 | size_t in_bytes; | |
290 | ||
291 | status = inflate (&in_stream, Z_SYNC_FLUSH); | |
292 | if (status != Z_OK && status != Z_STREAM_END) | |
293 | internal_error ("compressed stream: %s", zError (status)); | |
294 | ||
295 | in_bytes = remaining - in_stream.avail_in; | |
296 | out_bytes = outbuf_length - in_stream.avail_out; | |
297 | ||
298 | stream->callback ((const char *) outbuf, out_bytes, stream->opaque); | |
299 | lto_stats.num_uncompressed_il_bytes += out_bytes; | |
300 | uncompressed_bytes += out_bytes; | |
301 | ||
302 | cursor += in_bytes; | |
303 | remaining -= in_bytes; | |
304 | ||
305 | in_stream.next_out = outbuf; | |
306 | in_stream.avail_out = outbuf_length; | |
307 | in_stream.next_in = cursor; | |
308 | in_stream.avail_in = remaining; | |
309 | } | |
310 | while (!(status == Z_STREAM_END && out_bytes == 0)); | |
311 | ||
312 | status = inflateEnd (&in_stream); | |
313 | if (status != Z_OK) | |
314 | internal_error ("compressed stream: %s", zError (status)); | |
315 | } | |
316 | ||
317 | lto_destroy_compression_stream (stream); | |
318 | free (outbuf); | |
ed7dc894 | 319 | timevar_pop (TV_IPA_LTO_DECOMPRESS); |
d7f09764 | 320 | } |