Mercurial > hg > truffle
annotate src/share/vm/code/debugInfoRec.cpp @ 1135:e66fd840cb6b
6893081: method handle & invokedynamic code needs additional cleanup (post 6815692, 6858164)
Summary: During the work for 6829187 we have fixed a number of basic bugs which are logically grouped with 6815692 and 6858164 but which must be reviewed and pushed separately.
Reviewed-by: kvn, never
| author | twisti |
|---|---|
| date | Mon, 04 Jan 2010 18:38:08 +0100 |
| parents | 8e954aedbb81 |
| children | f70b0d9ab095 |
| rev | line source |
|---|---|
| 0 | 1 /* |
|
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72088be4b386
6873116: Modify reexecute implementation to use pcDesc to record the reexecute bit
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diff
changeset
|
2 * Copyright 1998-2009 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_debugInfoRec.cpp.incl" | |
| 27 | |
| 28 // Private definition. | |
| 29 // There is one DIR_Chunk for each scope and values array. | |
| 30 // A chunk can potentially be used more than once. | |
| 31 // We keep track of these chunks in order to detect | |
| 32 // repetition and enable sharing. | |
| 33 class DIR_Chunk { | |
| 34 friend class DebugInformationRecorder; | |
| 35 int _offset; // location in the stream of this scope | |
| 36 int _length; // number of bytes in the stream | |
| 37 int _hash; // hash of stream bytes (for quicker reuse) | |
| 38 | |
| 39 void* operator new(size_t ignore, DebugInformationRecorder* dir) { | |
| 40 assert(ignore == sizeof(DIR_Chunk), ""); | |
| 41 if (dir->_next_chunk >= dir->_next_chunk_limit) { | |
| 42 const int CHUNK = 100; | |
| 43 dir->_next_chunk = NEW_RESOURCE_ARRAY(DIR_Chunk, CHUNK); | |
| 44 dir->_next_chunk_limit = dir->_next_chunk + CHUNK; | |
| 45 } | |
| 46 return dir->_next_chunk++; | |
| 47 } | |
| 48 | |
| 49 DIR_Chunk(int offset, int length, DebugInformationRecorder* dir) { | |
| 50 _offset = offset; | |
| 51 _length = length; | |
| 52 unsigned int hash = 0; | |
| 53 address p = dir->stream()->buffer() + _offset; | |
| 54 for (int i = 0; i < length; i++) { | |
| 55 if (i == 6) break; | |
| 56 hash *= 127; | |
| 57 hash += p[i]; | |
| 58 } | |
| 59 _hash = hash; | |
| 60 } | |
| 61 | |
| 62 DIR_Chunk* find_match(GrowableArray<DIR_Chunk*>* arr, | |
| 63 int start_index, | |
| 64 DebugInformationRecorder* dir) { | |
| 65 int end_index = arr->length(); | |
| 66 int hash = this->_hash, length = this->_length; | |
| 67 address buf = dir->stream()->buffer(); | |
| 68 for (int i = end_index; --i >= start_index; ) { | |
| 69 DIR_Chunk* that = arr->at(i); | |
| 70 if (hash == that->_hash && | |
| 71 length == that->_length && | |
| 72 0 == memcmp(buf + this->_offset, buf + that->_offset, length)) { | |
| 73 return that; | |
| 74 } | |
| 75 } | |
| 76 return NULL; | |
| 77 } | |
| 78 }; | |
| 79 | |
| 80 static inline bool compute_recording_non_safepoints() { | |
| 81 if (JvmtiExport::should_post_compiled_method_load() | |
| 82 && FLAG_IS_DEFAULT(DebugNonSafepoints)) { | |
| 83 // The default value of this flag is taken to be true, | |
| 84 // if JVMTI is looking at nmethod codes. | |
| 85 // We anticipate that JVMTI may wish to participate in profiling. | |
| 86 return true; | |
| 87 } | |
| 88 | |
| 89 // If the flag is set manually, use it, whether true or false. | |
| 90 // Otherwise, if JVMTI is not in the picture, use the default setting. | |
| 91 // (This is true in debug, just for the exercise, false in product mode.) | |
| 92 return DebugNonSafepoints; | |
| 93 } | |
| 94 | |
| 95 DebugInformationRecorder::DebugInformationRecorder(OopRecorder* oop_recorder) | |
| 96 : _recording_non_safepoints(compute_recording_non_safepoints()) | |
| 97 { | |
| 98 _pcs_size = 100; | |
| 99 _pcs = NEW_RESOURCE_ARRAY(PcDesc, _pcs_size); | |
| 100 _pcs_length = 0; | |
| 101 | |
| 102 _prev_safepoint_pc = PcDesc::lower_offset_limit; | |
| 103 | |
| 104 _stream = new DebugInfoWriteStream(this, 10 * K); | |
| 105 // make sure that there is no stream_decode_offset that is zero | |
| 106 _stream->write_byte((jbyte)0xFF); | |
| 107 | |
| 108 // make sure that we can distinguish the value "serialized_null" from offsets | |
| 109 assert(_stream->position() > serialized_null, "sanity"); | |
| 110 | |
| 111 _oop_recorder = oop_recorder; | |
| 112 | |
| 113 _all_chunks = new GrowableArray<DIR_Chunk*>(300); | |
| 114 _shared_chunks = new GrowableArray<DIR_Chunk*>(30); | |
| 115 _next_chunk = _next_chunk_limit = NULL; | |
| 116 | |
| 117 add_new_pc_offset(PcDesc::lower_offset_limit); // sentinel record | |
| 118 | |
| 119 debug_only(_recording_state = rs_null); | |
| 120 } | |
| 121 | |
| 122 | |
| 123 void DebugInformationRecorder::add_oopmap(int pc_offset, OopMap* map) { | |
| 124 // !!!!! Preserve old style handling of oopmaps for now | |
| 125 _oopmaps->add_gc_map(pc_offset, map); | |
| 126 } | |
| 127 | |
| 128 void DebugInformationRecorder::add_safepoint(int pc_offset, OopMap* map) { | |
| 129 assert(!_oop_recorder->is_complete(), "not frozen yet"); | |
| 130 // Store the new safepoint | |
| 131 | |
| 132 // Add the oop map | |
| 133 add_oopmap(pc_offset, map); | |
| 134 | |
| 135 add_new_pc_offset(pc_offset); | |
| 136 | |
| 137 assert(_recording_state == rs_null, "nesting of recording calls"); | |
| 138 debug_only(_recording_state = rs_safepoint); | |
| 139 } | |
| 140 | |
| 141 void DebugInformationRecorder::add_non_safepoint(int pc_offset) { | |
| 142 assert(!_oop_recorder->is_complete(), "not frozen yet"); | |
| 143 assert(_recording_non_safepoints, "must be recording non-safepoints"); | |
| 144 | |
| 145 add_new_pc_offset(pc_offset); | |
| 146 | |
| 147 assert(_recording_state == rs_null, "nesting of recording calls"); | |
| 148 debug_only(_recording_state = rs_non_safepoint); | |
| 149 } | |
| 150 | |
| 151 void DebugInformationRecorder::add_new_pc_offset(int pc_offset) { | |
| 152 assert(_pcs_length == 0 || last_pc()->pc_offset() < pc_offset, | |
| 153 "must specify a new, larger pc offset"); | |
| 154 | |
| 155 // add the pcdesc | |
| 156 if (_pcs_length == _pcs_size) { | |
| 157 // Expand | |
| 158 int new_pcs_size = _pcs_size * 2; | |
| 159 PcDesc* new_pcs = NEW_RESOURCE_ARRAY(PcDesc, new_pcs_size); | |
| 160 for (int index = 0; index < _pcs_length; index++) { | |
| 161 new_pcs[index] = _pcs[index]; | |
| 162 } | |
| 163 _pcs_size = new_pcs_size; | |
| 164 _pcs = new_pcs; | |
| 165 } | |
| 166 assert(_pcs_size > _pcs_length, "There must be room for after expanding"); | |
| 167 | |
| 168 _pcs[_pcs_length++] = PcDesc(pc_offset, DebugInformationRecorder::serialized_null, | |
| 169 DebugInformationRecorder::serialized_null); | |
| 170 } | |
| 171 | |
| 172 | |
| 173 int DebugInformationRecorder::serialize_monitor_values(GrowableArray<MonitorValue*>* monitors) { | |
| 174 if (monitors == NULL || monitors->is_empty()) return DebugInformationRecorder::serialized_null; | |
| 175 assert(_recording_state == rs_safepoint, "must be recording a safepoint"); | |
| 176 int result = stream()->position(); | |
| 177 stream()->write_int(monitors->length()); | |
| 178 for (int index = 0; index < monitors->length(); index++) { | |
| 179 monitors->at(index)->write_on(stream()); | |
| 180 } | |
| 181 assert(result != serialized_null, "sanity"); | |
| 182 | |
| 183 // (See comment below on DebugInformationRecorder::describe_scope.) | |
| 184 int shared_result = find_sharable_decode_offset(result); | |
| 185 if (shared_result != serialized_null) { | |
| 186 stream()->set_position(result); | |
| 187 result = shared_result; | |
| 188 } | |
| 189 | |
| 190 return result; | |
| 191 } | |
| 192 | |
| 193 | |
| 194 int DebugInformationRecorder::serialize_scope_values(GrowableArray<ScopeValue*>* values) { | |
| 195 if (values == NULL || values->is_empty()) return DebugInformationRecorder::serialized_null; | |
| 196 assert(_recording_state == rs_safepoint, "must be recording a safepoint"); | |
| 197 int result = stream()->position(); | |
| 198 assert(result != serialized_null, "sanity"); | |
| 199 stream()->write_int(values->length()); | |
| 200 for (int index = 0; index < values->length(); index++) { | |
| 201 values->at(index)->write_on(stream()); | |
| 202 } | |
| 203 | |
| 204 // (See comment below on DebugInformationRecorder::describe_scope.) | |
| 205 int shared_result = find_sharable_decode_offset(result); | |
| 206 if (shared_result != serialized_null) { | |
| 207 stream()->set_position(result); | |
| 208 result = shared_result; | |
| 209 } | |
| 210 | |
| 211 return result; | |
| 212 } | |
| 213 | |
| 214 | |
| 215 #ifndef PRODUCT | |
| 216 // These variables are put into one block to reduce relocations | |
| 217 // and make it simpler to print from the debugger. | |
| 218 static | |
| 219 struct dir_stats_struct { | |
| 220 int chunks_queried; | |
| 221 int chunks_shared; | |
| 222 int chunks_reshared; | |
| 223 int chunks_elided; | |
| 224 | |
| 225 void print() { | |
| 226 tty->print_cr("Debug Data Chunks: %d, shared %d+%d, non-SP's elided %d", | |
| 227 chunks_queried, | |
| 228 chunks_shared, chunks_reshared, | |
| 229 chunks_elided); | |
| 230 } | |
| 231 } dir_stats; | |
| 232 #endif //PRODUCT | |
| 233 | |
| 234 | |
| 235 int DebugInformationRecorder::find_sharable_decode_offset(int stream_offset) { | |
| 236 // Only pull this trick if non-safepoint recording | |
| 237 // is enabled, for now. | |
| 238 if (!recording_non_safepoints()) | |
| 239 return serialized_null; | |
| 240 | |
| 241 NOT_PRODUCT(++dir_stats.chunks_queried); | |
| 242 int stream_length = stream()->position() - stream_offset; | |
| 243 assert(stream_offset != serialized_null, "should not be null"); | |
| 244 assert(stream_length != 0, "should not be empty"); | |
| 245 | |
| 246 DIR_Chunk* ns = new(this) DIR_Chunk(stream_offset, stream_length, this); | |
| 247 | |
| 248 // Look in previously shared scopes first: | |
| 249 DIR_Chunk* ms = ns->find_match(_shared_chunks, 0, this); | |
| 250 if (ms != NULL) { | |
| 251 NOT_PRODUCT(++dir_stats.chunks_reshared); | |
| 252 assert(ns+1 == _next_chunk, ""); | |
| 253 _next_chunk = ns; | |
| 254 return ms->_offset; | |
| 255 } | |
| 256 | |
| 257 // Look in recently encountered scopes next: | |
| 258 const int MAX_RECENT = 50; | |
| 259 int start_index = _all_chunks->length() - MAX_RECENT; | |
| 260 if (start_index < 0) start_index = 0; | |
| 261 ms = ns->find_match(_all_chunks, start_index, this); | |
| 262 if (ms != NULL) { | |
| 263 NOT_PRODUCT(++dir_stats.chunks_shared); | |
| 264 // Searching in _all_chunks is limited to a window, | |
| 265 // but searching in _shared_chunks is unlimited. | |
| 266 _shared_chunks->append(ms); | |
| 267 assert(ns+1 == _next_chunk, ""); | |
| 268 _next_chunk = ns; | |
| 269 return ms->_offset; | |
| 270 } | |
| 271 | |
| 272 // No match. Add this guy to the list, in hopes of future shares. | |
| 273 _all_chunks->append(ns); | |
| 274 return serialized_null; | |
| 275 } | |
| 276 | |
| 277 | |
| 278 // must call add_safepoint before: it sets PcDesc and this routine uses | |
| 279 // the last PcDesc set | |
| 280 void DebugInformationRecorder::describe_scope(int pc_offset, | |
| 281 ciMethod* method, | |
| 282 int bci, | |
|
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6833129: specjvm98 fails with NullPointerException in the compiler with -XX:DeoptimizeALot
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283 bool reexecute, |
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6893081: method handle & invokedynamic code needs additional cleanup (post 6815692, 6858164)
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284 bool is_method_handle_invoke, |
| 0 | 285 DebugToken* locals, |
| 286 DebugToken* expressions, | |
| 287 DebugToken* monitors) { | |
| 288 assert(_recording_state != rs_null, "nesting of recording calls"); | |
| 289 PcDesc* last_pd = last_pc(); | |
| 290 assert(last_pd->pc_offset() == pc_offset, "must be last pc"); | |
| 291 int sender_stream_offset = last_pd->scope_decode_offset(); | |
| 292 // update the stream offset of current pc desc | |
| 293 int stream_offset = stream()->position(); | |
| 294 last_pd->set_scope_decode_offset(stream_offset); | |
| 295 | |
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296 // Record flags into pcDesc. |
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297 last_pd->set_should_reexecute(reexecute); |
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298 last_pd->set_is_method_handle_invoke(is_method_handle_invoke); |
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299 |
| 0 | 300 // serialize sender stream offest |
| 301 stream()->write_int(sender_stream_offset); | |
| 302 | |
| 303 // serialize scope | |
|
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304 jobject method_enc = (method == NULL)? NULL: method->constant_encoding(); |
| 0 | 305 stream()->write_int(oop_recorder()->find_index(method_enc)); |
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306 stream()->write_bci(bci); |
| 0 | 307 assert(method == NULL || |
| 308 (method->is_native() && bci == 0) || | |
| 309 (!method->is_native() && 0 <= bci && bci < method->code_size()) || | |
| 310 bci == -1, "illegal bci"); | |
| 311 | |
| 312 // serialize the locals/expressions/monitors | |
| 313 stream()->write_int((intptr_t) locals); | |
| 314 stream()->write_int((intptr_t) expressions); | |
| 315 stream()->write_int((intptr_t) monitors); | |
| 316 | |
| 317 // Here's a tricky bit. We just wrote some bytes. | |
| 318 // Wouldn't it be nice to find that we had already | |
| 319 // written those same bytes somewhere else? | |
| 320 // If we get lucky this way, reset the stream | |
| 321 // and reuse the old bytes. By the way, this | |
| 322 // trick not only shares parent scopes, but also | |
| 323 // compresses equivalent non-safepoint PcDescs. | |
| 324 int shared_stream_offset = find_sharable_decode_offset(stream_offset); | |
| 325 if (shared_stream_offset != serialized_null) { | |
| 326 stream()->set_position(stream_offset); | |
| 327 last_pd->set_scope_decode_offset(shared_stream_offset); | |
| 328 } | |
| 329 } | |
| 330 | |
| 331 void DebugInformationRecorder::dump_object_pool(GrowableArray<ScopeValue*>* objects) { | |
| 332 guarantee( _pcs_length > 0, "safepoint must exist before describing scopes"); | |
| 333 PcDesc* last_pd = &_pcs[_pcs_length-1]; | |
| 334 if (objects != NULL) { | |
| 335 for (int i = objects->length() - 1; i >= 0; i--) { | |
| 336 ((ObjectValue*) objects->at(i))->set_visited(false); | |
| 337 } | |
| 338 } | |
| 339 int offset = serialize_scope_values(objects); | |
| 340 last_pd->set_obj_decode_offset(offset); | |
| 341 } | |
| 342 | |
| 343 void DebugInformationRecorder::end_scopes(int pc_offset, bool is_safepoint) { | |
| 344 assert(_recording_state == (is_safepoint? rs_safepoint: rs_non_safepoint), | |
| 345 "nesting of recording calls"); | |
| 346 debug_only(_recording_state = rs_null); | |
| 347 | |
| 348 // Try to compress away an equivalent non-safepoint predecessor. | |
| 349 // (This only works because we have previously recognized redundant | |
| 350 // scope trees and made them use a common scope_decode_offset.) | |
| 351 if (_pcs_length >= 2 && recording_non_safepoints()) { | |
| 352 PcDesc* last = last_pc(); | |
| 353 PcDesc* prev = prev_pc(); | |
| 354 // If prev is (a) not a safepoint and (b) has the same | |
| 355 // stream pointer, then it can be coalesced into the last. | |
| 356 // This is valid because non-safepoints are only sought | |
| 357 // with pc_desc_near, which (when it misses prev) will | |
| 358 // search forward until it finds last. | |
| 359 // In addition, it does not matter if the last PcDesc | |
| 360 // is for a safepoint or not. | |
|
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361 if (_prev_safepoint_pc < prev->pc_offset() && prev->is_same_info(last)) { |
| 0 | 362 assert(prev == last-1, "sane"); |
| 363 prev->set_pc_offset(pc_offset); | |
| 364 _pcs_length -= 1; | |
| 365 NOT_PRODUCT(++dir_stats.chunks_elided); | |
| 366 } | |
| 367 } | |
| 368 | |
| 369 // We have just recorded this safepoint. | |
| 370 // Remember it in case the previous paragraph needs to know. | |
| 371 if (is_safepoint) { | |
| 372 _prev_safepoint_pc = pc_offset; | |
| 373 } | |
| 374 } | |
| 375 | |
| 376 DebugToken* DebugInformationRecorder::create_scope_values(GrowableArray<ScopeValue*>* values) { | |
| 377 assert(!_oop_recorder->is_complete(), "not frozen yet"); | |
| 378 return (DebugToken*) (intptr_t) serialize_scope_values(values); | |
| 379 } | |
| 380 | |
| 381 | |
| 382 DebugToken* DebugInformationRecorder::create_monitor_values(GrowableArray<MonitorValue*>* monitors) { | |
| 383 assert(!_oop_recorder->is_complete(), "not frozen yet"); | |
| 384 return (DebugToken*) (intptr_t) serialize_monitor_values(monitors); | |
| 385 } | |
| 386 | |
| 387 | |
| 388 int DebugInformationRecorder::data_size() { | |
| 389 debug_only(_oop_recorder->oop_size()); // mark it "frozen" for asserts | |
| 390 return _stream->position(); | |
| 391 } | |
| 392 | |
| 393 | |
| 394 int DebugInformationRecorder::pcs_size() { | |
| 395 debug_only(_oop_recorder->oop_size()); // mark it "frozen" for asserts | |
| 396 if (last_pc()->pc_offset() != PcDesc::upper_offset_limit) | |
| 397 add_new_pc_offset(PcDesc::upper_offset_limit); | |
| 398 return _pcs_length * sizeof(PcDesc); | |
| 399 } | |
| 400 | |
| 401 | |
| 402 void DebugInformationRecorder::copy_to(nmethod* nm) { | |
| 403 nm->copy_scopes_data(stream()->buffer(), stream()->position()); | |
| 404 nm->copy_scopes_pcs(_pcs, _pcs_length); | |
| 405 } | |
| 406 | |
| 407 | |
| 408 void DebugInformationRecorder::verify(const nmethod* code) { | |
| 409 Unimplemented(); | |
| 410 } | |
| 411 | |
| 412 #ifndef PRODUCT | |
| 413 void DebugInformationRecorder::print_statistics() { | |
| 414 dir_stats.print(); | |
| 415 } | |
| 416 #endif //PRODUCT |