Mercurial > hg > truffle
annotate src/share/vm/code/debugInfoRec.cpp @ 15433:8638307944be
Add flag to always enable debug info sharing (true ifdef GRAAL)
| author | Gilles Duboscq <duboscq@ssw.jku.at> |
|---|---|
| date | Tue, 29 Apr 2014 16:11:54 +0200 |
| parents | fe11cb3c7882 |
| children | b888ded3ee42 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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2 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "code/debugInfoRec.hpp" | |
| 27 #include "code/scopeDesc.hpp" | |
| 28 #include "prims/jvmtiExport.hpp" | |
| 0 | 29 |
| 30 // Private definition. | |
| 31 // There is one DIR_Chunk for each scope and values array. | |
| 32 // A chunk can potentially be used more than once. | |
| 33 // We keep track of these chunks in order to detect | |
| 34 // repetition and enable sharing. | |
| 35 class DIR_Chunk { | |
| 36 friend class DebugInformationRecorder; | |
| 37 int _offset; // location in the stream of this scope | |
| 38 int _length; // number of bytes in the stream | |
| 39 int _hash; // hash of stream bytes (for quicker reuse) | |
| 40 | |
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41 void* operator new(size_t ignore, DebugInformationRecorder* dir) throw() { |
| 0 | 42 assert(ignore == sizeof(DIR_Chunk), ""); |
| 43 if (dir->_next_chunk >= dir->_next_chunk_limit) { | |
| 44 const int CHUNK = 100; | |
| 45 dir->_next_chunk = NEW_RESOURCE_ARRAY(DIR_Chunk, CHUNK); | |
| 46 dir->_next_chunk_limit = dir->_next_chunk + CHUNK; | |
| 47 } | |
| 48 return dir->_next_chunk++; | |
| 49 } | |
| 50 | |
| 51 DIR_Chunk(int offset, int length, DebugInformationRecorder* dir) { | |
| 52 _offset = offset; | |
| 53 _length = length; | |
| 54 unsigned int hash = 0; | |
| 55 address p = dir->stream()->buffer() + _offset; | |
| 56 for (int i = 0; i < length; i++) { | |
| 57 if (i == 6) break; | |
| 58 hash *= 127; | |
| 59 hash += p[i]; | |
| 60 } | |
| 61 _hash = hash; | |
| 62 } | |
| 63 | |
| 64 DIR_Chunk* find_match(GrowableArray<DIR_Chunk*>* arr, | |
| 65 int start_index, | |
| 66 DebugInformationRecorder* dir) { | |
| 67 int end_index = arr->length(); | |
| 68 int hash = this->_hash, length = this->_length; | |
| 69 address buf = dir->stream()->buffer(); | |
| 70 for (int i = end_index; --i >= start_index; ) { | |
| 71 DIR_Chunk* that = arr->at(i); | |
| 72 if (hash == that->_hash && | |
| 73 length == that->_length && | |
| 74 0 == memcmp(buf + this->_offset, buf + that->_offset, length)) { | |
| 75 return that; | |
| 76 } | |
| 77 } | |
| 78 return NULL; | |
| 79 } | |
| 80 }; | |
| 81 | |
| 82 static inline bool compute_recording_non_safepoints() { | |
| 83 if (JvmtiExport::should_post_compiled_method_load() | |
| 84 && FLAG_IS_DEFAULT(DebugNonSafepoints)) { | |
| 85 // The default value of this flag is taken to be true, | |
| 86 // if JVMTI is looking at nmethod codes. | |
| 87 // We anticipate that JVMTI may wish to participate in profiling. | |
| 88 return true; | |
| 89 } | |
| 90 | |
| 91 // If the flag is set manually, use it, whether true or false. | |
| 92 // Otherwise, if JVMTI is not in the picture, use the default setting. | |
| 93 // (This is true in debug, just for the exercise, false in product mode.) | |
| 94 return DebugNonSafepoints; | |
| 95 } | |
| 96 | |
| 97 DebugInformationRecorder::DebugInformationRecorder(OopRecorder* oop_recorder) | |
| 98 : _recording_non_safepoints(compute_recording_non_safepoints()) | |
| 99 { | |
| 100 _pcs_size = 100; | |
| 101 _pcs = NEW_RESOURCE_ARRAY(PcDesc, _pcs_size); | |
| 102 _pcs_length = 0; | |
| 103 | |
| 104 _prev_safepoint_pc = PcDesc::lower_offset_limit; | |
| 105 | |
| 106 _stream = new DebugInfoWriteStream(this, 10 * K); | |
| 107 // make sure that there is no stream_decode_offset that is zero | |
| 108 _stream->write_byte((jbyte)0xFF); | |
| 109 | |
| 110 // make sure that we can distinguish the value "serialized_null" from offsets | |
| 111 assert(_stream->position() > serialized_null, "sanity"); | |
| 112 | |
| 113 _oop_recorder = oop_recorder; | |
| 114 | |
| 115 _all_chunks = new GrowableArray<DIR_Chunk*>(300); | |
| 116 _shared_chunks = new GrowableArray<DIR_Chunk*>(30); | |
| 117 _next_chunk = _next_chunk_limit = NULL; | |
| 118 | |
| 119 add_new_pc_offset(PcDesc::lower_offset_limit); // sentinel record | |
| 120 | |
| 121 debug_only(_recording_state = rs_null); | |
| 122 } | |
| 123 | |
| 124 | |
| 125 void DebugInformationRecorder::add_oopmap(int pc_offset, OopMap* map) { | |
| 126 // !!!!! Preserve old style handling of oopmaps for now | |
| 127 _oopmaps->add_gc_map(pc_offset, map); | |
| 128 } | |
| 129 | |
| 130 void DebugInformationRecorder::add_safepoint(int pc_offset, OopMap* map) { | |
| 131 assert(!_oop_recorder->is_complete(), "not frozen yet"); | |
| 132 // Store the new safepoint | |
| 133 | |
| 134 // Add the oop map | |
| 135 add_oopmap(pc_offset, map); | |
| 136 | |
| 137 add_new_pc_offset(pc_offset); | |
| 138 | |
| 139 assert(_recording_state == rs_null, "nesting of recording calls"); | |
| 140 debug_only(_recording_state = rs_safepoint); | |
| 141 } | |
| 142 | |
| 143 void DebugInformationRecorder::add_non_safepoint(int pc_offset) { | |
| 144 assert(!_oop_recorder->is_complete(), "not frozen yet"); | |
| 145 assert(_recording_non_safepoints, "must be recording non-safepoints"); | |
| 146 | |
| 147 add_new_pc_offset(pc_offset); | |
| 148 | |
| 149 assert(_recording_state == rs_null, "nesting of recording calls"); | |
| 150 debug_only(_recording_state = rs_non_safepoint); | |
| 151 } | |
| 152 | |
| 153 void DebugInformationRecorder::add_new_pc_offset(int pc_offset) { | |
| 154 assert(_pcs_length == 0 || last_pc()->pc_offset() < pc_offset, | |
| 155 "must specify a new, larger pc offset"); | |
| 156 | |
| 157 // add the pcdesc | |
| 158 if (_pcs_length == _pcs_size) { | |
| 159 // Expand | |
| 160 int new_pcs_size = _pcs_size * 2; | |
| 161 PcDesc* new_pcs = NEW_RESOURCE_ARRAY(PcDesc, new_pcs_size); | |
| 162 for (int index = 0; index < _pcs_length; index++) { | |
| 163 new_pcs[index] = _pcs[index]; | |
| 164 } | |
| 165 _pcs_size = new_pcs_size; | |
| 166 _pcs = new_pcs; | |
| 167 } | |
| 168 assert(_pcs_size > _pcs_length, "There must be room for after expanding"); | |
| 169 | |
| 170 _pcs[_pcs_length++] = PcDesc(pc_offset, DebugInformationRecorder::serialized_null, | |
| 171 DebugInformationRecorder::serialized_null); | |
| 172 } | |
| 173 | |
| 174 | |
| 175 int DebugInformationRecorder::serialize_monitor_values(GrowableArray<MonitorValue*>* monitors) { | |
| 176 if (monitors == NULL || monitors->is_empty()) return DebugInformationRecorder::serialized_null; | |
| 177 assert(_recording_state == rs_safepoint, "must be recording a safepoint"); | |
| 178 int result = stream()->position(); | |
| 179 stream()->write_int(monitors->length()); | |
| 180 for (int index = 0; index < monitors->length(); index++) { | |
| 181 monitors->at(index)->write_on(stream()); | |
| 182 } | |
| 183 assert(result != serialized_null, "sanity"); | |
| 184 | |
| 185 // (See comment below on DebugInformationRecorder::describe_scope.) | |
| 186 int shared_result = find_sharable_decode_offset(result); | |
| 187 if (shared_result != serialized_null) { | |
| 188 stream()->set_position(result); | |
| 189 result = shared_result; | |
| 190 } | |
| 191 | |
| 192 return result; | |
| 193 } | |
| 194 | |
| 195 | |
| 196 int DebugInformationRecorder::serialize_scope_values(GrowableArray<ScopeValue*>* values) { | |
| 197 if (values == NULL || values->is_empty()) return DebugInformationRecorder::serialized_null; | |
| 198 assert(_recording_state == rs_safepoint, "must be recording a safepoint"); | |
| 199 int result = stream()->position(); | |
| 200 assert(result != serialized_null, "sanity"); | |
| 201 stream()->write_int(values->length()); | |
| 202 for (int index = 0; index < values->length(); index++) { | |
| 203 values->at(index)->write_on(stream()); | |
| 204 } | |
| 205 | |
| 206 // (See comment below on DebugInformationRecorder::describe_scope.) | |
| 207 int shared_result = find_sharable_decode_offset(result); | |
| 208 if (shared_result != serialized_null) { | |
| 209 stream()->set_position(result); | |
| 210 result = shared_result; | |
| 211 } | |
| 212 | |
| 213 return result; | |
| 214 } | |
| 215 | |
| 216 | |
| 217 #ifndef PRODUCT | |
| 218 // These variables are put into one block to reduce relocations | |
| 219 // and make it simpler to print from the debugger. | |
| 220 static | |
| 221 struct dir_stats_struct { | |
| 222 int chunks_queried; | |
| 223 int chunks_shared; | |
| 224 int chunks_reshared; | |
| 225 int chunks_elided; | |
| 226 | |
| 227 void print() { | |
| 228 tty->print_cr("Debug Data Chunks: %d, shared %d+%d, non-SP's elided %d", | |
| 229 chunks_queried, | |
| 230 chunks_shared, chunks_reshared, | |
| 231 chunks_elided); | |
| 232 } | |
| 233 } dir_stats; | |
| 234 #endif //PRODUCT | |
| 235 | |
| 236 | |
| 237 int DebugInformationRecorder::find_sharable_decode_offset(int stream_offset) { | |
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238 if (FLAG_IS_DEFAULT(ShareDebugInfo)) { |
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239 if (!ShareDebugInfo && !recording_non_safepoints()) { |
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240 return serialized_null; |
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241 } |
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242 } else if (!ShareDebugInfo) { |
| 0 | 243 return serialized_null; |
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244 } |
| 0 | 245 |
| 246 NOT_PRODUCT(++dir_stats.chunks_queried); | |
| 247 int stream_length = stream()->position() - stream_offset; | |
| 248 assert(stream_offset != serialized_null, "should not be null"); | |
| 249 assert(stream_length != 0, "should not be empty"); | |
| 250 | |
| 251 DIR_Chunk* ns = new(this) DIR_Chunk(stream_offset, stream_length, this); | |
| 252 | |
| 253 // Look in previously shared scopes first: | |
| 254 DIR_Chunk* ms = ns->find_match(_shared_chunks, 0, this); | |
| 255 if (ms != NULL) { | |
| 256 NOT_PRODUCT(++dir_stats.chunks_reshared); | |
| 257 assert(ns+1 == _next_chunk, ""); | |
| 258 _next_chunk = ns; | |
| 259 return ms->_offset; | |
| 260 } | |
| 261 | |
| 262 // Look in recently encountered scopes next: | |
| 263 const int MAX_RECENT = 50; | |
| 264 int start_index = _all_chunks->length() - MAX_RECENT; | |
| 265 if (start_index < 0) start_index = 0; | |
| 266 ms = ns->find_match(_all_chunks, start_index, this); | |
| 267 if (ms != NULL) { | |
| 268 NOT_PRODUCT(++dir_stats.chunks_shared); | |
| 269 // Searching in _all_chunks is limited to a window, | |
| 270 // but searching in _shared_chunks is unlimited. | |
| 271 _shared_chunks->append(ms); | |
| 272 assert(ns+1 == _next_chunk, ""); | |
| 273 _next_chunk = ns; | |
| 274 return ms->_offset; | |
| 275 } | |
| 276 | |
| 277 // No match. Add this guy to the list, in hopes of future shares. | |
| 278 _all_chunks->append(ns); | |
| 279 return serialized_null; | |
| 280 } | |
| 281 | |
| 282 | |
| 283 // must call add_safepoint before: it sets PcDesc and this routine uses | |
| 284 // the last PcDesc set | |
| 285 void DebugInformationRecorder::describe_scope(int pc_offset, | |
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286 methodHandle methodH, |
| 0 | 287 ciMethod* method, |
| 288 int bci, | |
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289 bool reexecute, |
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290 bool rethrow_exception, |
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291 bool is_method_handle_invoke, |
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292 bool return_oop, |
| 0 | 293 DebugToken* locals, |
| 294 DebugToken* expressions, | |
| 295 DebugToken* monitors) { | |
| 296 assert(_recording_state != rs_null, "nesting of recording calls"); | |
| 297 PcDesc* last_pd = last_pc(); | |
| 298 assert(last_pd->pc_offset() == pc_offset, "must be last pc"); | |
| 299 int sender_stream_offset = last_pd->scope_decode_offset(); | |
| 300 // update the stream offset of current pc desc | |
| 301 int stream_offset = stream()->position(); | |
| 302 last_pd->set_scope_decode_offset(stream_offset); | |
| 303 | |
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304 // Record flags into pcDesc. |
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305 last_pd->set_should_reexecute(reexecute); |
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306 last_pd->set_rethrow_exception(rethrow_exception); |
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307 last_pd->set_is_method_handle_invoke(is_method_handle_invoke); |
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308 last_pd->set_return_oop(return_oop); |
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309 |
| 0 | 310 // serialize sender stream offest |
| 311 stream()->write_int(sender_stream_offset); | |
| 312 | |
| 313 // serialize scope | |
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314 Metadata* method_enc; |
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315 if (method != NULL) { |
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316 method_enc = method->constant_encoding(); |
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317 } else if (methodH.not_null()) { |
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318 method_enc = methodH(); |
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319 } else { |
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320 method_enc = NULL; |
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321 } |
| 0 | 322 stream()->write_int(oop_recorder()->find_index(method_enc)); |
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323 stream()->write_bci(bci); |
| 0 | 324 assert(method == NULL || |
| 325 (method->is_native() && bci == 0) || | |
| 326 (!method->is_native() && 0 <= bci && bci < method->code_size()) || | |
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327 (method->is_compiled_lambda_form() && bci == -99) || // this might happen in C1 |
| 0 | 328 bci == -1, "illegal bci"); |
| 329 | |
| 330 // serialize the locals/expressions/monitors | |
| 331 stream()->write_int((intptr_t) locals); | |
| 332 stream()->write_int((intptr_t) expressions); | |
| 333 stream()->write_int((intptr_t) monitors); | |
| 334 | |
| 335 // Here's a tricky bit. We just wrote some bytes. | |
| 336 // Wouldn't it be nice to find that we had already | |
| 337 // written those same bytes somewhere else? | |
| 338 // If we get lucky this way, reset the stream | |
| 339 // and reuse the old bytes. By the way, this | |
| 340 // trick not only shares parent scopes, but also | |
| 341 // compresses equivalent non-safepoint PcDescs. | |
| 342 int shared_stream_offset = find_sharable_decode_offset(stream_offset); | |
| 343 if (shared_stream_offset != serialized_null) { | |
| 344 stream()->set_position(stream_offset); | |
| 345 last_pd->set_scope_decode_offset(shared_stream_offset); | |
| 346 } | |
| 347 } | |
| 348 | |
| 349 void DebugInformationRecorder::dump_object_pool(GrowableArray<ScopeValue*>* objects) { | |
| 350 guarantee( _pcs_length > 0, "safepoint must exist before describing scopes"); | |
| 351 PcDesc* last_pd = &_pcs[_pcs_length-1]; | |
| 352 if (objects != NULL) { | |
| 353 for (int i = objects->length() - 1; i >= 0; i--) { | |
| 354 ((ObjectValue*) objects->at(i))->set_visited(false); | |
| 355 } | |
| 356 } | |
| 357 int offset = serialize_scope_values(objects); | |
| 358 last_pd->set_obj_decode_offset(offset); | |
| 359 } | |
| 360 | |
| 361 void DebugInformationRecorder::end_scopes(int pc_offset, bool is_safepoint) { | |
| 362 assert(_recording_state == (is_safepoint? rs_safepoint: rs_non_safepoint), | |
| 363 "nesting of recording calls"); | |
| 364 debug_only(_recording_state = rs_null); | |
| 365 | |
| 366 // Try to compress away an equivalent non-safepoint predecessor. | |
| 367 // (This only works because we have previously recognized redundant | |
| 368 // scope trees and made them use a common scope_decode_offset.) | |
| 369 if (_pcs_length >= 2 && recording_non_safepoints()) { | |
| 370 PcDesc* last = last_pc(); | |
| 371 PcDesc* prev = prev_pc(); | |
| 372 // If prev is (a) not a safepoint and (b) has the same | |
| 373 // stream pointer, then it can be coalesced into the last. | |
| 374 // This is valid because non-safepoints are only sought | |
| 375 // with pc_desc_near, which (when it misses prev) will | |
| 376 // search forward until it finds last. | |
| 377 // In addition, it does not matter if the last PcDesc | |
| 378 // is for a safepoint or not. | |
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379 if (_prev_safepoint_pc < prev->pc_offset() && prev->is_same_info(last)) { |
| 0 | 380 assert(prev == last-1, "sane"); |
| 381 prev->set_pc_offset(pc_offset); | |
| 382 _pcs_length -= 1; | |
| 383 NOT_PRODUCT(++dir_stats.chunks_elided); | |
| 384 } | |
| 385 } | |
| 386 | |
| 387 // We have just recorded this safepoint. | |
| 388 // Remember it in case the previous paragraph needs to know. | |
| 389 if (is_safepoint) { | |
| 390 _prev_safepoint_pc = pc_offset; | |
| 391 } | |
| 392 } | |
| 393 | |
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394 #ifdef ASSERT |
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395 bool DebugInformationRecorder::recorders_frozen() { |
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396 return _oop_recorder->is_complete() || _oop_recorder->is_complete(); |
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397 } |
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398 |
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399 void DebugInformationRecorder::mark_recorders_frozen() { |
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400 _oop_recorder->freeze(); |
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401 } |
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402 #endif // PRODUCT |
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403 |
| 0 | 404 DebugToken* DebugInformationRecorder::create_scope_values(GrowableArray<ScopeValue*>* values) { |
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405 assert(!recorders_frozen(), "not frozen yet"); |
| 0 | 406 return (DebugToken*) (intptr_t) serialize_scope_values(values); |
| 407 } | |
| 408 | |
| 409 | |
| 410 DebugToken* DebugInformationRecorder::create_monitor_values(GrowableArray<MonitorValue*>* monitors) { | |
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411 assert(!recorders_frozen(), "not frozen yet"); |
| 0 | 412 return (DebugToken*) (intptr_t) serialize_monitor_values(monitors); |
| 413 } | |
| 414 | |
| 415 | |
| 416 int DebugInformationRecorder::data_size() { | |
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417 debug_only(mark_recorders_frozen()); // mark it "frozen" for asserts |
| 0 | 418 return _stream->position(); |
| 419 } | |
| 420 | |
| 421 | |
| 422 int DebugInformationRecorder::pcs_size() { | |
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423 debug_only(mark_recorders_frozen()); // mark it "frozen" for asserts |
| 0 | 424 if (last_pc()->pc_offset() != PcDesc::upper_offset_limit) |
| 425 add_new_pc_offset(PcDesc::upper_offset_limit); | |
| 426 return _pcs_length * sizeof(PcDesc); | |
| 427 } | |
| 428 | |
| 429 | |
| 430 void DebugInformationRecorder::copy_to(nmethod* nm) { | |
| 431 nm->copy_scopes_data(stream()->buffer(), stream()->position()); | |
| 432 nm->copy_scopes_pcs(_pcs, _pcs_length); | |
| 433 } | |
| 434 | |
| 435 | |
| 436 void DebugInformationRecorder::verify(const nmethod* code) { | |
| 437 Unimplemented(); | |
| 438 } | |
| 439 | |
| 440 #ifndef PRODUCT | |
| 441 void DebugInformationRecorder::print_statistics() { | |
| 442 dir_stats.print(); | |
| 443 } | |
| 444 #endif //PRODUCT |