Mercurial > hg > CbC > CbC_gcc
annotate gcc/lto-compress.c @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
parents | 84e7813d76e9 |
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rev | line source |
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1 /* LTO IL compression streams. |
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2 |
145 | 3 Copyright (C) 2009-2020 Free Software Foundation, Inc. |
55
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4 Contributed by Simon Baldwin <simonb@google.com> |
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5 |
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6 This file is part of GCC. |
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7 |
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8 GCC is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by |
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10 the Free Software Foundation; either version 3, or (at your option) |
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11 any later version. |
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12 |
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13 GCC is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
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16 License for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with GCC; see the file COPYING3. If not see |
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20 <http://www.gnu.org/licenses/>. */ |
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21 |
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22 #include "config.h" |
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23 #include "system.h" |
111 | 24 #include "coretypes.h" |
25 #include "backend.h" | |
26 #include "tree.h" | |
27 #include "gimple.h" | |
28 #include "cgraph.h" | |
29 #include "lto-streamer.h" | |
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30 /* zlib.h includes other system headers. Those headers may test feature |
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31 test macros. config.h may define feature test macros. For this reason, |
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32 zlib.h needs to be included after, rather than before, config.h and |
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33 system.h. */ |
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34 #include <zlib.h> |
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35 #include "lto-compress.h" |
111 | 36 #include "timevar.h" |
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37 |
145 | 38 #ifdef HAVE_ZSTD_H |
39 #include <zstd.h> | |
40 #endif | |
41 | |
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42 /* Compression stream structure, holds the flush callback and opaque token, |
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43 the buffered data, and a note of whether compressing or uncompressing. */ |
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44 |
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45 struct lto_compression_stream |
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46 { |
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47 void (*callback) (const char *, unsigned, void *); |
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48 void *opaque; |
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49 char *buffer; |
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50 size_t bytes; |
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51 size_t allocation; |
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52 bool is_compression; |
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53 }; |
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54 |
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55 /* Overall compression constants for zlib. */ |
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56 |
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57 static const size_t Z_BUFFER_LENGTH = 4096; |
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58 static const size_t MIN_STREAM_ALLOCATION = 1024; |
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59 |
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60 /* For zlib, allocate SIZE count of ITEMS and return the address, OPAQUE |
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61 is unused. */ |
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62 |
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63 static void * |
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64 lto_zalloc (void *opaque, unsigned items, unsigned size) |
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65 { |
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66 gcc_assert (opaque == Z_NULL); |
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67 return xmalloc (items * size); |
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68 } |
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69 |
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70 /* For zlib, free memory at ADDRESS, OPAQUE is unused. */ |
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71 |
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72 static void |
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73 lto_zfree (void *opaque, void *address) |
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74 { |
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75 gcc_assert (opaque == Z_NULL); |
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76 free (address); |
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77 } |
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78 |
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79 /* Return a zlib compression level that zlib will not reject. Normalizes |
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80 the compression level from the command line flag, clamping non-default |
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81 values to the appropriate end of their valid range. */ |
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82 |
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83 static int |
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84 lto_normalized_zlib_level (void) |
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85 { |
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86 int level = flag_lto_compression_level; |
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87 |
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88 if (level != Z_DEFAULT_COMPRESSION) |
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89 { |
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90 if (level < Z_NO_COMPRESSION) |
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91 level = Z_NO_COMPRESSION; |
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92 else if (level > Z_BEST_COMPRESSION) |
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93 level = Z_BEST_COMPRESSION; |
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94 } |
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95 |
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96 return level; |
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97 } |
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98 |
145 | 99 /* Free the buffer and memory associated with STREAM. */ |
100 | |
101 static void | |
102 lto_destroy_compression_stream (struct lto_compression_stream *stream) | |
103 { | |
104 free (stream->buffer); | |
105 free (stream); | |
106 } | |
107 | |
108 #ifdef HAVE_ZSTD_H | |
109 /* Return a zstd compression level that zstd will not reject. Normalizes | |
110 the compression level from the command line flag, clamping non-default | |
111 values to the appropriate end of their valid range. */ | |
112 | |
113 static int | |
114 lto_normalized_zstd_level (void) | |
115 { | |
116 int level = flag_lto_compression_level; | |
117 | |
118 if (level < 0) | |
119 level = 0; | |
120 else if (level > ZSTD_maxCLevel ()) | |
121 level = ZSTD_maxCLevel (); | |
122 | |
123 return level; | |
124 } | |
125 | |
126 /* Compress STREAM using ZSTD algorithm. */ | |
127 | |
128 static void | |
129 lto_compression_zstd (struct lto_compression_stream *stream) | |
130 { | |
131 unsigned char *cursor = (unsigned char *) stream->buffer; | |
132 size_t size = stream->bytes; | |
133 | |
134 timevar_push (TV_IPA_LTO_COMPRESS); | |
135 size_t const outbuf_length = ZSTD_compressBound (size); | |
136 char *outbuf = (char *) xmalloc (outbuf_length); | |
137 | |
138 size_t const csize = ZSTD_compress (outbuf, outbuf_length, cursor, size, | |
139 lto_normalized_zstd_level ()); | |
140 | |
141 if (ZSTD_isError (csize)) | |
142 internal_error ("compressed stream: %s", ZSTD_getErrorName (csize)); | |
143 | |
144 stream->callback (outbuf, csize, NULL); | |
145 | |
146 lto_destroy_compression_stream (stream); | |
147 free (outbuf); | |
148 timevar_pop (TV_IPA_LTO_COMPRESS); | |
149 } | |
150 | |
151 /* Uncompress STREAM using ZSTD algorithm. */ | |
152 | |
153 static void | |
154 lto_uncompression_zstd (struct lto_compression_stream *stream) | |
155 { | |
156 unsigned char *cursor = (unsigned char *) stream->buffer; | |
157 size_t size = stream->bytes; | |
158 | |
159 timevar_push (TV_IPA_LTO_DECOMPRESS); | |
160 unsigned long long const rsize = ZSTD_getFrameContentSize (cursor, size); | |
161 if (rsize == ZSTD_CONTENTSIZE_ERROR) | |
162 internal_error ("original not compressed with zstd"); | |
163 else if (rsize == ZSTD_CONTENTSIZE_UNKNOWN) | |
164 internal_error ("original size unknown"); | |
165 | |
166 char *outbuf = (char *) xmalloc (rsize); | |
167 size_t const dsize = ZSTD_decompress (outbuf, rsize, cursor, size); | |
168 | |
169 if (ZSTD_isError (dsize)) | |
170 internal_error ("decompressed stream: %s", ZSTD_getErrorName (dsize)); | |
171 | |
172 stream->callback (outbuf, dsize, stream->opaque); | |
173 | |
174 lto_destroy_compression_stream (stream); | |
175 free (outbuf); | |
176 timevar_pop (TV_IPA_LTO_DECOMPRESS); | |
177 } | |
178 | |
179 #endif | |
180 | |
55
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181 /* Create a new compression stream, with CALLBACK flush function passed |
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182 OPAQUE token, IS_COMPRESSION indicates if compressing or uncompressing. */ |
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183 |
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184 static struct lto_compression_stream * |
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185 lto_new_compression_stream (void (*callback) (const char *, unsigned, void *), |
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186 void *opaque, bool is_compression) |
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187 { |
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188 struct lto_compression_stream *stream |
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189 = (struct lto_compression_stream *) xmalloc (sizeof (*stream)); |
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190 |
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191 memset (stream, 0, sizeof (*stream)); |
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192 stream->callback = callback; |
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193 stream->opaque = opaque; |
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194 stream->is_compression = is_compression; |
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195 |
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196 return stream; |
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197 } |
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198 |
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199 /* Append NUM_CHARS from address BASE to STREAM. */ |
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200 |
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201 static void |
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202 lto_append_to_compression_stream (struct lto_compression_stream *stream, |
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203 const char *base, size_t num_chars) |
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204 { |
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205 size_t required = stream->bytes + num_chars; |
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206 |
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207 if (stream->allocation < required) |
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208 { |
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209 if (stream->allocation == 0) |
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210 stream->allocation = MIN_STREAM_ALLOCATION; |
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211 while (stream->allocation < required) |
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212 stream->allocation *= 2; |
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213 |
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214 stream->buffer = (char *) xrealloc (stream->buffer, stream->allocation); |
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215 } |
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216 |
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217 memcpy (stream->buffer + stream->bytes, base, num_chars); |
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218 stream->bytes += num_chars; |
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219 } |
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220 |
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221 /* Return a new compression stream, with CALLBACK flush function passed |
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222 OPAQUE token. */ |
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223 |
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224 struct lto_compression_stream * |
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225 lto_start_compression (void (*callback) (const char *, unsigned, void *), |
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226 void *opaque) |
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227 { |
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228 return lto_new_compression_stream (callback, opaque, true); |
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229 } |
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230 |
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231 /* Append NUM_CHARS from address BASE to STREAM. */ |
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232 |
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233 void |
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234 lto_compress_block (struct lto_compression_stream *stream, |
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235 const char *base, size_t num_chars) |
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236 { |
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237 gcc_assert (stream->is_compression); |
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238 |
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239 lto_append_to_compression_stream (stream, base, num_chars); |
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240 lto_stats.num_output_il_bytes += num_chars; |
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241 } |
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242 |
145 | 243 static void ATTRIBUTE_UNUSED |
244 lto_compression_zlib (struct lto_compression_stream *stream) | |
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245 { |
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246 unsigned char *cursor = (unsigned char *) stream->buffer; |
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247 size_t remaining = stream->bytes; |
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248 const size_t outbuf_length = Z_BUFFER_LENGTH; |
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249 unsigned char *outbuf = (unsigned char *) xmalloc (outbuf_length); |
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250 z_stream out_stream; |
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251 size_t compressed_bytes = 0; |
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252 int status; |
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253 |
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254 gcc_assert (stream->is_compression); |
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255 |
111 | 256 timevar_push (TV_IPA_LTO_COMPRESS); |
257 | |
55
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258 out_stream.next_out = outbuf; |
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259 out_stream.avail_out = outbuf_length; |
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260 out_stream.next_in = cursor; |
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261 out_stream.avail_in = remaining; |
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262 out_stream.zalloc = lto_zalloc; |
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263 out_stream.zfree = lto_zfree; |
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264 out_stream.opaque = Z_NULL; |
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265 |
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266 status = deflateInit (&out_stream, lto_normalized_zlib_level ()); |
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267 if (status != Z_OK) |
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268 internal_error ("compressed stream: %s", zError (status)); |
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269 |
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270 do |
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271 { |
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272 size_t in_bytes, out_bytes; |
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273 |
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274 status = deflate (&out_stream, Z_FINISH); |
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275 if (status != Z_OK && status != Z_STREAM_END) |
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276 internal_error ("compressed stream: %s", zError (status)); |
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277 |
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278 in_bytes = remaining - out_stream.avail_in; |
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279 out_bytes = outbuf_length - out_stream.avail_out; |
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280 |
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281 stream->callback ((const char *) outbuf, out_bytes, stream->opaque); |
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282 lto_stats.num_compressed_il_bytes += out_bytes; |
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283 compressed_bytes += out_bytes; |
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284 |
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285 cursor += in_bytes; |
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286 remaining -= in_bytes; |
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287 |
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288 out_stream.next_out = outbuf; |
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289 out_stream.avail_out = outbuf_length; |
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290 out_stream.next_in = cursor; |
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291 out_stream.avail_in = remaining; |
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292 } |
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293 while (status != Z_STREAM_END); |
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294 |
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295 status = deflateEnd (&out_stream); |
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296 if (status != Z_OK) |
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297 internal_error ("compressed stream: %s", zError (status)); |
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298 |
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299 lto_destroy_compression_stream (stream); |
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300 free (outbuf); |
111 | 301 timevar_pop (TV_IPA_LTO_COMPRESS); |
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302 } |
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303 |
145 | 304 void |
305 lto_end_compression (struct lto_compression_stream *stream) | |
306 { | |
307 #ifdef HAVE_ZSTD_H | |
308 lto_compression_zstd (stream); | |
309 #else | |
310 lto_compression_zlib (stream); | |
311 #endif | |
312 } | |
313 | |
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314 /* Return a new uncompression stream, with CALLBACK flush function passed |
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315 OPAQUE token. */ |
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316 |
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317 struct lto_compression_stream * |
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318 lto_start_uncompression (void (*callback) (const char *, unsigned, void *), |
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319 void *opaque) |
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320 { |
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321 return lto_new_compression_stream (callback, opaque, false); |
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322 } |
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323 |
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324 /* Append NUM_CHARS from address BASE to STREAM. */ |
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325 |
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326 void |
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327 lto_uncompress_block (struct lto_compression_stream *stream, |
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328 const char *base, size_t num_chars) |
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329 { |
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330 gcc_assert (!stream->is_compression); |
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331 |
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332 lto_append_to_compression_stream (stream, base, num_chars); |
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333 lto_stats.num_input_il_bytes += num_chars; |
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334 } |
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335 |
145 | 336 static void |
337 lto_uncompression_zlib (struct lto_compression_stream *stream) | |
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338 { |
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339 unsigned char *cursor = (unsigned char *) stream->buffer; |
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340 size_t remaining = stream->bytes; |
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341 const size_t outbuf_length = Z_BUFFER_LENGTH; |
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342 unsigned char *outbuf = (unsigned char *) xmalloc (outbuf_length); |
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343 size_t uncompressed_bytes = 0; |
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344 |
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345 gcc_assert (!stream->is_compression); |
111 | 346 timevar_push (TV_IPA_LTO_DECOMPRESS); |
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347 |
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348 while (remaining > 0) |
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349 { |
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350 z_stream in_stream; |
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351 size_t out_bytes; |
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352 int status; |
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353 |
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354 in_stream.next_out = outbuf; |
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355 in_stream.avail_out = outbuf_length; |
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356 in_stream.next_in = cursor; |
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357 in_stream.avail_in = remaining; |
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358 in_stream.zalloc = lto_zalloc; |
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359 in_stream.zfree = lto_zfree; |
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360 in_stream.opaque = Z_NULL; |
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361 |
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362 status = inflateInit (&in_stream); |
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363 if (status != Z_OK) |
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364 internal_error ("compressed stream: %s", zError (status)); |
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365 |
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366 do |
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367 { |
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368 size_t in_bytes; |
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369 |
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370 status = inflate (&in_stream, Z_SYNC_FLUSH); |
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371 if (status != Z_OK && status != Z_STREAM_END) |
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372 internal_error ("compressed stream: %s", zError (status)); |
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373 |
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374 in_bytes = remaining - in_stream.avail_in; |
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375 out_bytes = outbuf_length - in_stream.avail_out; |
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376 |
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377 stream->callback ((const char *) outbuf, out_bytes, stream->opaque); |
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378 lto_stats.num_uncompressed_il_bytes += out_bytes; |
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379 uncompressed_bytes += out_bytes; |
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380 |
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381 cursor += in_bytes; |
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382 remaining -= in_bytes; |
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383 |
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384 in_stream.next_out = outbuf; |
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385 in_stream.avail_out = outbuf_length; |
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386 in_stream.next_in = cursor; |
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387 in_stream.avail_in = remaining; |
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388 } |
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389 while (!(status == Z_STREAM_END && out_bytes == 0)); |
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390 |
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391 status = inflateEnd (&in_stream); |
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392 if (status != Z_OK) |
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393 internal_error ("compressed stream: %s", zError (status)); |
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394 } |
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395 |
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396 lto_destroy_compression_stream (stream); |
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397 free (outbuf); |
111 | 398 timevar_pop (TV_IPA_LTO_DECOMPRESS); |
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399 } |
145 | 400 |
401 void | |
402 lto_end_uncompression (struct lto_compression_stream *stream, | |
403 lto_compression compression) | |
404 { | |
405 #ifdef HAVE_ZSTD_H | |
406 if (compression == ZSTD) | |
407 { | |
408 lto_uncompression_zstd (stream); | |
409 return; | |
410 } | |
411 #endif | |
412 if (compression == ZSTD) | |
413 internal_error ("compiler does not support ZSTD LTO compression"); | |
414 | |
415 lto_uncompression_zlib (stream); | |
416 } |