Mercurial > hg > graal-compiler
annotate src/share/vm/code/debugInfoRec.cpp @ 15100:fe11cb3c7882
enable sharing of debug info all the time
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Mon, 14 Apr 2014 15:07:05 -0700 |
parents | cefad50507d8 |
children | 8638307944be |
rev | line source |
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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 // It's always a space win to share and Graal generates quite a bit |
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239 // of scopes data so always enable the sharing logic with Graal. |
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240 // Presumably this is disabled in regular HotSpot because it makes |
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241 // recording more expensive? |
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242 #ifndef GRAAL |
0 | 243 // Only pull this trick if non-safepoint recording |
244 // is enabled, for now. | |
245 if (!recording_non_safepoints()) | |
246 return serialized_null; | |
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247 #endif |
0 | 248 |
249 NOT_PRODUCT(++dir_stats.chunks_queried); | |
250 int stream_length = stream()->position() - stream_offset; | |
251 assert(stream_offset != serialized_null, "should not be null"); | |
252 assert(stream_length != 0, "should not be empty"); | |
253 | |
254 DIR_Chunk* ns = new(this) DIR_Chunk(stream_offset, stream_length, this); | |
255 | |
256 // Look in previously shared scopes first: | |
257 DIR_Chunk* ms = ns->find_match(_shared_chunks, 0, this); | |
258 if (ms != NULL) { | |
259 NOT_PRODUCT(++dir_stats.chunks_reshared); | |
260 assert(ns+1 == _next_chunk, ""); | |
261 _next_chunk = ns; | |
262 return ms->_offset; | |
263 } | |
264 | |
265 // Look in recently encountered scopes next: | |
266 const int MAX_RECENT = 50; | |
267 int start_index = _all_chunks->length() - MAX_RECENT; | |
268 if (start_index < 0) start_index = 0; | |
269 ms = ns->find_match(_all_chunks, start_index, this); | |
270 if (ms != NULL) { | |
271 NOT_PRODUCT(++dir_stats.chunks_shared); | |
272 // Searching in _all_chunks is limited to a window, | |
273 // but searching in _shared_chunks is unlimited. | |
274 _shared_chunks->append(ms); | |
275 assert(ns+1 == _next_chunk, ""); | |
276 _next_chunk = ns; | |
277 return ms->_offset; | |
278 } | |
279 | |
280 // No match. Add this guy to the list, in hopes of future shares. | |
281 _all_chunks->append(ns); | |
282 return serialized_null; | |
283 } | |
284 | |
285 | |
286 // must call add_safepoint before: it sets PcDesc and this routine uses | |
287 // the last PcDesc set | |
288 void DebugInformationRecorder::describe_scope(int pc_offset, | |
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289 methodHandle methodH, |
0 | 290 ciMethod* method, |
291 int bci, | |
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292 bool reexecute, |
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293 bool rethrow_exception, |
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294 bool is_method_handle_invoke, |
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295 bool return_oop, |
0 | 296 DebugToken* locals, |
297 DebugToken* expressions, | |
298 DebugToken* monitors) { | |
299 assert(_recording_state != rs_null, "nesting of recording calls"); | |
300 PcDesc* last_pd = last_pc(); | |
301 assert(last_pd->pc_offset() == pc_offset, "must be last pc"); | |
302 int sender_stream_offset = last_pd->scope_decode_offset(); | |
303 // update the stream offset of current pc desc | |
304 int stream_offset = stream()->position(); | |
305 last_pd->set_scope_decode_offset(stream_offset); | |
306 | |
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307 // Record flags into pcDesc. |
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308 last_pd->set_should_reexecute(reexecute); |
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309 last_pd->set_rethrow_exception(rethrow_exception); |
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310 last_pd->set_is_method_handle_invoke(is_method_handle_invoke); |
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311 last_pd->set_return_oop(return_oop); |
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312 |
0 | 313 // serialize sender stream offest |
314 stream()->write_int(sender_stream_offset); | |
315 | |
316 // serialize scope | |
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317 Metadata* method_enc; |
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318 if (method != NULL) { |
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319 method_enc = method->constant_encoding(); |
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320 } else if (methodH.not_null()) { |
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321 method_enc = methodH(); |
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322 } else { |
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323 method_enc = NULL; |
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324 } |
0 | 325 stream()->write_int(oop_recorder()->find_index(method_enc)); |
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326 stream()->write_bci(bci); |
0 | 327 assert(method == NULL || |
328 (method->is_native() && bci == 0) || | |
329 (!method->is_native() && 0 <= bci && bci < method->code_size()) || | |
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330 (method->is_compiled_lambda_form() && bci == -99) || // this might happen in C1 |
0 | 331 bci == -1, "illegal bci"); |
332 | |
333 // serialize the locals/expressions/monitors | |
334 stream()->write_int((intptr_t) locals); | |
335 stream()->write_int((intptr_t) expressions); | |
336 stream()->write_int((intptr_t) monitors); | |
337 | |
338 // Here's a tricky bit. We just wrote some bytes. | |
339 // Wouldn't it be nice to find that we had already | |
340 // written those same bytes somewhere else? | |
341 // If we get lucky this way, reset the stream | |
342 // and reuse the old bytes. By the way, this | |
343 // trick not only shares parent scopes, but also | |
344 // compresses equivalent non-safepoint PcDescs. | |
345 int shared_stream_offset = find_sharable_decode_offset(stream_offset); | |
346 if (shared_stream_offset != serialized_null) { | |
347 stream()->set_position(stream_offset); | |
348 last_pd->set_scope_decode_offset(shared_stream_offset); | |
349 } | |
350 } | |
351 | |
352 void DebugInformationRecorder::dump_object_pool(GrowableArray<ScopeValue*>* objects) { | |
353 guarantee( _pcs_length > 0, "safepoint must exist before describing scopes"); | |
354 PcDesc* last_pd = &_pcs[_pcs_length-1]; | |
355 if (objects != NULL) { | |
356 for (int i = objects->length() - 1; i >= 0; i--) { | |
357 ((ObjectValue*) objects->at(i))->set_visited(false); | |
358 } | |
359 } | |
360 int offset = serialize_scope_values(objects); | |
361 last_pd->set_obj_decode_offset(offset); | |
362 } | |
363 | |
364 void DebugInformationRecorder::end_scopes(int pc_offset, bool is_safepoint) { | |
365 assert(_recording_state == (is_safepoint? rs_safepoint: rs_non_safepoint), | |
366 "nesting of recording calls"); | |
367 debug_only(_recording_state = rs_null); | |
368 | |
369 // Try to compress away an equivalent non-safepoint predecessor. | |
370 // (This only works because we have previously recognized redundant | |
371 // scope trees and made them use a common scope_decode_offset.) | |
372 if (_pcs_length >= 2 && recording_non_safepoints()) { | |
373 PcDesc* last = last_pc(); | |
374 PcDesc* prev = prev_pc(); | |
375 // If prev is (a) not a safepoint and (b) has the same | |
376 // stream pointer, then it can be coalesced into the last. | |
377 // This is valid because non-safepoints are only sought | |
378 // with pc_desc_near, which (when it misses prev) will | |
379 // search forward until it finds last. | |
380 // In addition, it does not matter if the last PcDesc | |
381 // is for a safepoint or not. | |
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382 if (_prev_safepoint_pc < prev->pc_offset() && prev->is_same_info(last)) { |
0 | 383 assert(prev == last-1, "sane"); |
384 prev->set_pc_offset(pc_offset); | |
385 _pcs_length -= 1; | |
386 NOT_PRODUCT(++dir_stats.chunks_elided); | |
387 } | |
388 } | |
389 | |
390 // We have just recorded this safepoint. | |
391 // Remember it in case the previous paragraph needs to know. | |
392 if (is_safepoint) { | |
393 _prev_safepoint_pc = pc_offset; | |
394 } | |
395 } | |
396 | |
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397 #ifdef ASSERT |
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398 bool DebugInformationRecorder::recorders_frozen() { |
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399 return _oop_recorder->is_complete() || _oop_recorder->is_complete(); |
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400 } |
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401 |
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402 void DebugInformationRecorder::mark_recorders_frozen() { |
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403 _oop_recorder->freeze(); |
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404 } |
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405 #endif // PRODUCT |
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406 |
0 | 407 DebugToken* DebugInformationRecorder::create_scope_values(GrowableArray<ScopeValue*>* values) { |
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408 assert(!recorders_frozen(), "not frozen yet"); |
0 | 409 return (DebugToken*) (intptr_t) serialize_scope_values(values); |
410 } | |
411 | |
412 | |
413 DebugToken* DebugInformationRecorder::create_monitor_values(GrowableArray<MonitorValue*>* monitors) { | |
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414 assert(!recorders_frozen(), "not frozen yet"); |
0 | 415 return (DebugToken*) (intptr_t) serialize_monitor_values(monitors); |
416 } | |
417 | |
418 | |
419 int DebugInformationRecorder::data_size() { | |
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420 debug_only(mark_recorders_frozen()); // mark it "frozen" for asserts |
0 | 421 return _stream->position(); |
422 } | |
423 | |
424 | |
425 int DebugInformationRecorder::pcs_size() { | |
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426 debug_only(mark_recorders_frozen()); // mark it "frozen" for asserts |
0 | 427 if (last_pc()->pc_offset() != PcDesc::upper_offset_limit) |
428 add_new_pc_offset(PcDesc::upper_offset_limit); | |
429 return _pcs_length * sizeof(PcDesc); | |
430 } | |
431 | |
432 | |
433 void DebugInformationRecorder::copy_to(nmethod* nm) { | |
434 nm->copy_scopes_data(stream()->buffer(), stream()->position()); | |
435 nm->copy_scopes_pcs(_pcs, _pcs_length); | |
436 } | |
437 | |
438 | |
439 void DebugInformationRecorder::verify(const nmethod* code) { | |
440 Unimplemented(); | |
441 } | |
442 | |
443 #ifndef PRODUCT | |
444 void DebugInformationRecorder::print_statistics() { | |
445 dir_stats.print(); | |
446 } | |
447 #endif //PRODUCT |