Mercurial > hg > truffle
annotate src/share/vm/code/codeCache.cpp @ 2194:face83fc8882
7012088: jump to 0 address because of lack of memory ordering in SignatureHandlerLibrary::add
Summary: Write method signature handler under lock to prevent race with growable array resizing
Reviewed-by: dsamersoff, dholmes
author | coleenp |
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date | Wed, 02 Feb 2011 18:38:40 -0500 |
parents | 51bd2d261853 |
children | 1c0cf339481b |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2010, 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/codeBlob.hpp" | |
27 #include "code/codeCache.hpp" | |
28 #include "code/dependencies.hpp" | |
29 #include "code/nmethod.hpp" | |
30 #include "code/pcDesc.hpp" | |
31 #include "gc_implementation/shared/markSweep.hpp" | |
32 #include "memory/allocation.inline.hpp" | |
33 #include "memory/gcLocker.hpp" | |
34 #include "memory/iterator.hpp" | |
35 #include "memory/resourceArea.hpp" | |
36 #include "oops/methodOop.hpp" | |
37 #include "oops/objArrayOop.hpp" | |
38 #include "oops/oop.inline.hpp" | |
39 #include "runtime/handles.inline.hpp" | |
40 #include "runtime/icache.hpp" | |
41 #include "runtime/java.hpp" | |
42 #include "runtime/mutexLocker.hpp" | |
43 #include "services/memoryService.hpp" | |
44 #include "utilities/xmlstream.hpp" | |
0 | 45 |
46 // Helper class for printing in CodeCache | |
47 | |
48 class CodeBlob_sizes { | |
49 private: | |
50 int count; | |
51 int total_size; | |
52 int header_size; | |
53 int code_size; | |
54 int stub_size; | |
55 int relocation_size; | |
56 int scopes_oop_size; | |
57 int scopes_data_size; | |
58 int scopes_pcs_size; | |
59 | |
60 public: | |
61 CodeBlob_sizes() { | |
62 count = 0; | |
63 total_size = 0; | |
64 header_size = 0; | |
65 code_size = 0; | |
66 stub_size = 0; | |
67 relocation_size = 0; | |
68 scopes_oop_size = 0; | |
69 scopes_data_size = 0; | |
70 scopes_pcs_size = 0; | |
71 } | |
72 | |
73 int total() { return total_size; } | |
74 bool is_empty() { return count == 0; } | |
75 | |
76 void print(const char* title) { | |
77 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])", | |
78 count, | |
79 title, | |
80 total() / K, | |
81 header_size * 100 / total_size, | |
82 relocation_size * 100 / total_size, | |
83 code_size * 100 / total_size, | |
84 stub_size * 100 / total_size, | |
85 scopes_oop_size * 100 / total_size, | |
86 scopes_data_size * 100 / total_size, | |
87 scopes_pcs_size * 100 / total_size); | |
88 } | |
89 | |
90 void add(CodeBlob* cb) { | |
91 count++; | |
92 total_size += cb->size(); | |
93 header_size += cb->header_size(); | |
94 relocation_size += cb->relocation_size(); | |
95 if (cb->is_nmethod()) { | |
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96 nmethod* nm = cb->as_nmethod_or_null(); |
1748 | 97 code_size += nm->insts_size(); |
0 | 98 stub_size += nm->stub_size(); |
99 | |
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100 scopes_oop_size += nm->oops_size(); |
0 | 101 scopes_data_size += nm->scopes_data_size(); |
102 scopes_pcs_size += nm->scopes_pcs_size(); | |
103 } else { | |
1748 | 104 code_size += cb->code_size(); |
0 | 105 } |
106 } | |
107 }; | |
108 | |
109 | |
110 // CodeCache implementation | |
111 | |
112 CodeHeap * CodeCache::_heap = new CodeHeap(); | |
113 int CodeCache::_number_of_blobs = 0; | |
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114 int CodeCache::_number_of_adapters = 0; |
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115 int CodeCache::_number_of_nmethods = 0; |
0 | 116 int CodeCache::_number_of_nmethods_with_dependencies = 0; |
117 bool CodeCache::_needs_cache_clean = false; | |
989 | 118 nmethod* CodeCache::_scavenge_root_nmethods = NULL; |
1202 | 119 nmethod* CodeCache::_saved_nmethods = NULL; |
0 | 120 |
121 | |
122 CodeBlob* CodeCache::first() { | |
123 assert_locked_or_safepoint(CodeCache_lock); | |
124 return (CodeBlob*)_heap->first(); | |
125 } | |
126 | |
127 | |
128 CodeBlob* CodeCache::next(CodeBlob* cb) { | |
129 assert_locked_or_safepoint(CodeCache_lock); | |
130 return (CodeBlob*)_heap->next(cb); | |
131 } | |
132 | |
133 | |
134 CodeBlob* CodeCache::alive(CodeBlob *cb) { | |
135 assert_locked_or_safepoint(CodeCache_lock); | |
136 while (cb != NULL && !cb->is_alive()) cb = next(cb); | |
137 return cb; | |
138 } | |
139 | |
140 | |
141 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) { | |
142 assert_locked_or_safepoint(CodeCache_lock); | |
143 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb); | |
144 return (nmethod*)cb; | |
145 } | |
146 | |
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147 nmethod* CodeCache::first_nmethod() { |
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148 assert_locked_or_safepoint(CodeCache_lock); |
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149 CodeBlob* cb = first(); |
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150 while (cb != NULL && !cb->is_nmethod()) { |
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151 cb = next(cb); |
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152 } |
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153 return (nmethod*)cb; |
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154 } |
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155 |
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156 nmethod* CodeCache::next_nmethod (CodeBlob* cb) { |
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157 assert_locked_or_safepoint(CodeCache_lock); |
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158 cb = next(cb); |
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159 while (cb != NULL && !cb->is_nmethod()) { |
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160 cb = next(cb); |
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161 } |
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162 return (nmethod*)cb; |
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163 } |
0 | 164 |
165 CodeBlob* CodeCache::allocate(int size) { | |
166 // Do not seize the CodeCache lock here--if the caller has not | |
167 // already done so, we are going to lose bigtime, since the code | |
168 // cache will contain a garbage CodeBlob until the caller can | |
169 // run the constructor for the CodeBlob subclass he is busy | |
170 // instantiating. | |
171 guarantee(size >= 0, "allocation request must be reasonable"); | |
172 assert_locked_or_safepoint(CodeCache_lock); | |
173 CodeBlob* cb = NULL; | |
174 _number_of_blobs++; | |
175 while (true) { | |
176 cb = (CodeBlob*)_heap->allocate(size); | |
177 if (cb != NULL) break; | |
178 if (!_heap->expand_by(CodeCacheExpansionSize)) { | |
179 // Expansion failed | |
180 return NULL; | |
181 } | |
182 if (PrintCodeCacheExtension) { | |
183 ResourceMark rm; | |
184 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)", | |
185 (intptr_t)_heap->begin(), (intptr_t)_heap->end(), | |
186 (address)_heap->end() - (address)_heap->begin()); | |
187 } | |
188 } | |
189 verify_if_often(); | |
989 | 190 print_trace("allocation", cb, size); |
0 | 191 return cb; |
192 } | |
193 | |
194 void CodeCache::free(CodeBlob* cb) { | |
195 assert_locked_or_safepoint(CodeCache_lock); | |
196 verify_if_often(); | |
197 | |
989 | 198 print_trace("free", cb); |
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199 if (cb->is_nmethod()) { |
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200 _number_of_nmethods--; |
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201 if (((nmethod *)cb)->has_dependencies()) { |
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202 _number_of_nmethods_with_dependencies--; |
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203 } |
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204 } |
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205 if (cb->is_adapter_blob()) { |
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206 _number_of_adapters--; |
0 | 207 } |
208 _number_of_blobs--; | |
209 | |
210 _heap->deallocate(cb); | |
211 | |
212 verify_if_often(); | |
213 assert(_number_of_blobs >= 0, "sanity check"); | |
214 } | |
215 | |
216 | |
217 void CodeCache::commit(CodeBlob* cb) { | |
218 // this is called by nmethod::nmethod, which must already own CodeCache_lock | |
219 assert_locked_or_safepoint(CodeCache_lock); | |
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220 if (cb->is_nmethod()) { |
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221 _number_of_nmethods++; |
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222 if (((nmethod *)cb)->has_dependencies()) { |
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223 _number_of_nmethods_with_dependencies++; |
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224 } |
0 | 225 } |
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226 if (cb->is_adapter_blob()) { |
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227 _number_of_adapters++; |
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228 } |
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229 |
0 | 230 // flush the hardware I-cache |
1748 | 231 ICache::invalidate_range(cb->content_begin(), cb->content_size()); |
0 | 232 } |
233 | |
234 | |
235 void CodeCache::flush() { | |
236 assert_locked_or_safepoint(CodeCache_lock); | |
237 Unimplemented(); | |
238 } | |
239 | |
240 | |
241 // Iteration over CodeBlobs | |
242 | |
243 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) ) | |
244 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var))) | |
245 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var))) | |
246 | |
247 | |
248 bool CodeCache::contains(void *p) { | |
249 // It should be ok to call contains without holding a lock | |
250 return _heap->contains(p); | |
251 } | |
252 | |
253 | |
254 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not | |
255 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain | |
256 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled. | |
257 CodeBlob* CodeCache::find_blob(void* start) { | |
258 CodeBlob* result = find_blob_unsafe(start); | |
259 if (result == NULL) return NULL; | |
260 // We could potientially look up non_entrant methods | |
261 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method"); | |
262 return result; | |
263 } | |
264 | |
265 nmethod* CodeCache::find_nmethod(void* start) { | |
266 CodeBlob *cb = find_blob(start); | |
267 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod"); | |
268 return (nmethod*)cb; | |
269 } | |
270 | |
271 | |
272 void CodeCache::blobs_do(void f(CodeBlob* nm)) { | |
273 assert_locked_or_safepoint(CodeCache_lock); | |
274 FOR_ALL_BLOBS(p) { | |
275 f(p); | |
276 } | |
277 } | |
278 | |
279 | |
280 void CodeCache::nmethods_do(void f(nmethod* nm)) { | |
281 assert_locked_or_safepoint(CodeCache_lock); | |
282 FOR_ALL_BLOBS(nm) { | |
283 if (nm->is_nmethod()) f((nmethod*)nm); | |
284 } | |
285 } | |
286 | |
287 | |
288 int CodeCache::alignment_unit() { | |
289 return (int)_heap->alignment_unit(); | |
290 } | |
291 | |
292 | |
293 int CodeCache::alignment_offset() { | |
294 return (int)_heap->alignment_offset(); | |
295 } | |
296 | |
297 | |
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298 // Mark nmethods for unloading if they contain otherwise unreachable |
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299 // oops. |
0 | 300 void CodeCache::do_unloading(BoolObjectClosure* is_alive, |
301 OopClosure* keep_alive, | |
302 bool unloading_occurred) { | |
303 assert_locked_or_safepoint(CodeCache_lock); | |
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304 FOR_ALL_ALIVE_NMETHODS(nm) { |
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305 nm->do_unloading(is_alive, keep_alive, unloading_occurred); |
0 | 306 } |
307 } | |
308 | |
989 | 309 void CodeCache::blobs_do(CodeBlobClosure* f) { |
0 | 310 assert_locked_or_safepoint(CodeCache_lock); |
311 FOR_ALL_ALIVE_BLOBS(cb) { | |
989 | 312 f->do_code_blob(cb); |
313 | |
314 #ifdef ASSERT | |
315 if (cb->is_nmethod()) | |
316 ((nmethod*)cb)->verify_scavenge_root_oops(); | |
317 #endif //ASSERT | |
0 | 318 } |
319 } | |
320 | |
989 | 321 // Walk the list of methods which might contain non-perm oops. |
322 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) { | |
323 assert_locked_or_safepoint(CodeCache_lock); | |
324 debug_only(mark_scavenge_root_nmethods()); | |
325 | |
326 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
327 debug_only(cur->clear_scavenge_root_marked()); | |
328 assert(cur->scavenge_root_not_marked(), ""); | |
329 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
330 | |
331 bool is_live = (!cur->is_zombie() && !cur->is_unloaded()); | |
332 #ifndef PRODUCT | |
333 if (TraceScavenge) { | |
334 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr(); | |
335 } | |
336 #endif //PRODUCT | |
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337 if (is_live) { |
989 | 338 // Perform cur->oops_do(f), maybe just once per nmethod. |
339 f->do_code_blob(cur); | |
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340 cur->fix_oop_relocations(); |
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341 } |
989 | 342 } |
343 | |
344 // Check for stray marks. | |
345 debug_only(verify_perm_nmethods(NULL)); | |
346 } | |
347 | |
348 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) { | |
349 assert_locked_or_safepoint(CodeCache_lock); | |
350 nm->set_on_scavenge_root_list(); | |
351 nm->set_scavenge_root_link(_scavenge_root_nmethods); | |
352 set_scavenge_root_nmethods(nm); | |
353 print_trace("add_scavenge_root", nm); | |
354 } | |
355 | |
356 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) { | |
357 assert_locked_or_safepoint(CodeCache_lock); | |
358 print_trace("drop_scavenge_root", nm); | |
359 nmethod* last = NULL; | |
360 nmethod* cur = scavenge_root_nmethods(); | |
361 while (cur != NULL) { | |
362 nmethod* next = cur->scavenge_root_link(); | |
363 if (cur == nm) { | |
364 if (last != NULL) | |
365 last->set_scavenge_root_link(next); | |
366 else set_scavenge_root_nmethods(next); | |
367 nm->set_scavenge_root_link(NULL); | |
368 nm->clear_on_scavenge_root_list(); | |
369 return; | |
370 } | |
371 last = cur; | |
372 cur = next; | |
373 } | |
374 assert(false, "should have been on list"); | |
375 } | |
376 | |
377 void CodeCache::prune_scavenge_root_nmethods() { | |
378 assert_locked_or_safepoint(CodeCache_lock); | |
379 debug_only(mark_scavenge_root_nmethods()); | |
380 | |
381 nmethod* last = NULL; | |
382 nmethod* cur = scavenge_root_nmethods(); | |
383 while (cur != NULL) { | |
384 nmethod* next = cur->scavenge_root_link(); | |
385 debug_only(cur->clear_scavenge_root_marked()); | |
386 assert(cur->scavenge_root_not_marked(), ""); | |
387 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
388 | |
389 if (!cur->is_zombie() && !cur->is_unloaded() | |
390 && cur->detect_scavenge_root_oops()) { | |
391 // Keep it. Advance 'last' to prevent deletion. | |
392 last = cur; | |
393 } else { | |
394 // Prune it from the list, so we don't have to look at it any more. | |
395 print_trace("prune_scavenge_root", cur); | |
396 cur->set_scavenge_root_link(NULL); | |
397 cur->clear_on_scavenge_root_list(); | |
398 if (last != NULL) | |
399 last->set_scavenge_root_link(next); | |
400 else set_scavenge_root_nmethods(next); | |
401 } | |
402 cur = next; | |
403 } | |
404 | |
405 // Check for stray marks. | |
406 debug_only(verify_perm_nmethods(NULL)); | |
407 } | |
408 | |
409 #ifndef PRODUCT | |
410 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) { | |
411 // While we are here, verify the integrity of the list. | |
412 mark_scavenge_root_nmethods(); | |
413 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
414 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
415 cur->clear_scavenge_root_marked(); | |
416 } | |
417 verify_perm_nmethods(f); | |
418 } | |
419 | |
420 // Temporarily mark nmethods that are claimed to be on the non-perm list. | |
421 void CodeCache::mark_scavenge_root_nmethods() { | |
422 FOR_ALL_ALIVE_BLOBS(cb) { | |
423 if (cb->is_nmethod()) { | |
424 nmethod *nm = (nmethod*)cb; | |
425 assert(nm->scavenge_root_not_marked(), "clean state"); | |
426 if (nm->on_scavenge_root_list()) | |
427 nm->set_scavenge_root_marked(); | |
428 } | |
429 } | |
430 } | |
431 | |
432 // If the closure is given, run it on the unlisted nmethods. | |
433 // Also make sure that the effects of mark_scavenge_root_nmethods is gone. | |
434 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) { | |
435 FOR_ALL_ALIVE_BLOBS(cb) { | |
436 bool call_f = (f_or_null != NULL); | |
437 if (cb->is_nmethod()) { | |
438 nmethod *nm = (nmethod*)cb; | |
439 assert(nm->scavenge_root_not_marked(), "must be already processed"); | |
440 if (nm->on_scavenge_root_list()) | |
441 call_f = false; // don't show this one to the client | |
442 nm->verify_scavenge_root_oops(); | |
443 } else { | |
444 call_f = false; // not an nmethod | |
445 } | |
446 if (call_f) f_or_null->do_code_blob(cb); | |
447 } | |
448 } | |
449 #endif //PRODUCT | |
450 | |
1202 | 451 |
452 nmethod* CodeCache::find_and_remove_saved_code(methodOop m) { | |
453 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
454 nmethod* saved = _saved_nmethods; | |
455 nmethod* prev = NULL; | |
456 while (saved != NULL) { | |
457 if (saved->is_in_use() && saved->method() == m) { | |
458 if (prev != NULL) { | |
459 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
460 } else { | |
461 _saved_nmethods = saved->saved_nmethod_link(); | |
462 } | |
463 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods"); | |
464 saved->set_speculatively_disconnected(false); | |
465 saved->set_saved_nmethod_link(NULL); | |
466 if (PrintMethodFlushing) { | |
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467 saved->print_on(tty, " ### nmethod is reconnected\n"); |
1202 | 468 } |
469 if (LogCompilation && (xtty != NULL)) { | |
470 ttyLocker ttyl; | |
471 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id()); | |
472 xtty->method(methodOop(m)); | |
473 xtty->stamp(); | |
474 xtty->end_elem(); | |
475 } | |
476 return saved; | |
477 } | |
478 prev = saved; | |
479 saved = saved->saved_nmethod_link(); | |
480 } | |
481 return NULL; | |
482 } | |
483 | |
484 void CodeCache::remove_saved_code(nmethod* nm) { | |
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485 // For conc swpr this will be called with CodeCache_lock taken by caller |
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486 assert_locked_or_safepoint(CodeCache_lock); |
1202 | 487 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods"); |
488 nmethod* saved = _saved_nmethods; | |
489 nmethod* prev = NULL; | |
490 while (saved != NULL) { | |
491 if (saved == nm) { | |
492 if (prev != NULL) { | |
493 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
494 } else { | |
495 _saved_nmethods = saved->saved_nmethod_link(); | |
496 } | |
497 if (LogCompilation && (xtty != NULL)) { | |
498 ttyLocker ttyl; | |
499 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id()); | |
500 xtty->stamp(); | |
501 xtty->end_elem(); | |
502 } | |
503 return; | |
504 } | |
505 prev = saved; | |
506 saved = saved->saved_nmethod_link(); | |
507 } | |
508 ShouldNotReachHere(); | |
509 } | |
510 | |
511 void CodeCache::speculatively_disconnect(nmethod* nm) { | |
512 assert_locked_or_safepoint(CodeCache_lock); | |
513 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods"); | |
514 nm->set_saved_nmethod_link(_saved_nmethods); | |
515 _saved_nmethods = nm; | |
516 if (PrintMethodFlushing) { | |
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517 nm->print_on(tty, " ### nmethod is speculatively disconnected\n"); |
1202 | 518 } |
519 if (LogCompilation && (xtty != NULL)) { | |
520 ttyLocker ttyl; | |
521 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id()); | |
522 xtty->method(methodOop(nm->method())); | |
523 xtty->stamp(); | |
524 xtty->end_elem(); | |
525 } | |
526 nm->method()->clear_code(); | |
527 nm->set_speculatively_disconnected(true); | |
528 } | |
529 | |
530 | |
0 | 531 void CodeCache::gc_prologue() { |
989 | 532 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called"); |
0 | 533 } |
534 | |
535 | |
536 void CodeCache::gc_epilogue() { | |
537 assert_locked_or_safepoint(CodeCache_lock); | |
538 FOR_ALL_ALIVE_BLOBS(cb) { | |
539 if (cb->is_nmethod()) { | |
540 nmethod *nm = (nmethod*)cb; | |
541 assert(!nm->is_unloaded(), "Tautology"); | |
542 if (needs_cache_clean()) { | |
543 nm->cleanup_inline_caches(); | |
544 } | |
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545 DEBUG_ONLY(nm->verify()); |
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546 nm->fix_oop_relocations(); |
0 | 547 } |
548 } | |
549 set_needs_cache_clean(false); | |
989 | 550 prune_scavenge_root_nmethods(); |
551 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); | |
0 | 552 } |
553 | |
554 | |
555 address CodeCache::first_address() { | |
556 assert_locked_or_safepoint(CodeCache_lock); | |
557 return (address)_heap->begin(); | |
558 } | |
559 | |
560 | |
561 address CodeCache::last_address() { | |
562 assert_locked_or_safepoint(CodeCache_lock); | |
563 return (address)_heap->end(); | |
564 } | |
565 | |
566 | |
567 void icache_init(); | |
568 | |
569 void CodeCache::initialize() { | |
570 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points"); | |
571 #ifdef COMPILER2 | |
572 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops"); | |
573 #endif | |
574 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants"); | |
575 // This was originally just a check of the alignment, causing failure, instead, round | |
576 // the code cache to the page size. In particular, Solaris is moving to a larger | |
577 // default page size. | |
578 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size()); | |
579 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size()); | |
580 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size()); | |
581 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) { | |
582 vm_exit_during_initialization("Could not reserve enough space for code cache"); | |
583 } | |
584 | |
585 MemoryService::add_code_heap_memory_pool(_heap); | |
586 | |
587 // Initialize ICache flush mechanism | |
588 // This service is needed for os::register_code_area | |
589 icache_init(); | |
590 | |
591 // Give OS a chance to register generated code area. | |
592 // This is used on Windows 64 bit platforms to register | |
593 // Structured Exception Handlers for our generated code. | |
594 os::register_code_area(_heap->low_boundary(), _heap->high_boundary()); | |
595 } | |
596 | |
597 | |
598 void codeCache_init() { | |
599 CodeCache::initialize(); | |
600 } | |
601 | |
602 //------------------------------------------------------------------------------------------------ | |
603 | |
604 int CodeCache::number_of_nmethods_with_dependencies() { | |
605 return _number_of_nmethods_with_dependencies; | |
606 } | |
607 | |
608 void CodeCache::clear_inline_caches() { | |
609 assert_locked_or_safepoint(CodeCache_lock); | |
610 FOR_ALL_ALIVE_NMETHODS(nm) { | |
611 nm->clear_inline_caches(); | |
612 } | |
613 } | |
614 | |
615 #ifndef PRODUCT | |
616 // used to keep track of how much time is spent in mark_for_deoptimization | |
617 static elapsedTimer dependentCheckTime; | |
618 static int dependentCheckCount = 0; | |
619 #endif // PRODUCT | |
620 | |
621 | |
622 int CodeCache::mark_for_deoptimization(DepChange& changes) { | |
623 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
624 | |
625 #ifndef PRODUCT | |
626 dependentCheckTime.start(); | |
627 dependentCheckCount++; | |
628 #endif // PRODUCT | |
629 | |
630 int number_of_marked_CodeBlobs = 0; | |
631 | |
632 // search the hierarchy looking for nmethods which are affected by the loading of this class | |
633 | |
634 // then search the interfaces this class implements looking for nmethods | |
635 // which might be dependent of the fact that an interface only had one | |
636 // implementor. | |
637 | |
638 { No_Safepoint_Verifier nsv; | |
639 for (DepChange::ContextStream str(changes, nsv); str.next(); ) { | |
640 klassOop d = str.klass(); | |
641 number_of_marked_CodeBlobs += instanceKlass::cast(d)->mark_dependent_nmethods(changes); | |
642 } | |
643 } | |
644 | |
645 if (VerifyDependencies) { | |
646 // Turn off dependency tracing while actually testing deps. | |
647 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); | |
648 FOR_ALL_ALIVE_NMETHODS(nm) { | |
649 if (!nm->is_marked_for_deoptimization() && | |
650 nm->check_all_dependencies()) { | |
651 ResourceMark rm; | |
652 tty->print_cr("Should have been marked for deoptimization:"); | |
653 changes.print(); | |
654 nm->print(); | |
655 nm->print_dependencies(); | |
656 } | |
657 } | |
658 } | |
659 | |
660 #ifndef PRODUCT | |
661 dependentCheckTime.stop(); | |
662 #endif // PRODUCT | |
663 | |
664 return number_of_marked_CodeBlobs; | |
665 } | |
666 | |
667 | |
668 #ifdef HOTSWAP | |
669 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) { | |
670 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
671 int number_of_marked_CodeBlobs = 0; | |
672 | |
673 // Deoptimize all methods of the evolving class itself | |
674 objArrayOop old_methods = dependee->methods(); | |
675 for (int i = 0; i < old_methods->length(); i++) { | |
676 ResourceMark rm; | |
677 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
678 nmethod *nm = old_method->code(); | |
679 if (nm != NULL) { | |
680 nm->mark_for_deoptimization(); | |
681 number_of_marked_CodeBlobs++; | |
682 } | |
683 } | |
684 | |
685 FOR_ALL_ALIVE_NMETHODS(nm) { | |
686 if (nm->is_marked_for_deoptimization()) { | |
687 // ...Already marked in the previous pass; don't count it again. | |
688 } else if (nm->is_evol_dependent_on(dependee())) { | |
689 ResourceMark rm; | |
690 nm->mark_for_deoptimization(); | |
691 number_of_marked_CodeBlobs++; | |
692 } else { | |
693 // flush caches in case they refer to a redefined methodOop | |
694 nm->clear_inline_caches(); | |
695 } | |
696 } | |
697 | |
698 return number_of_marked_CodeBlobs; | |
699 } | |
700 #endif // HOTSWAP | |
701 | |
702 | |
703 // Deoptimize all methods | |
704 void CodeCache::mark_all_nmethods_for_deoptimization() { | |
705 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
706 FOR_ALL_ALIVE_NMETHODS(nm) { | |
707 nm->mark_for_deoptimization(); | |
708 } | |
709 } | |
710 | |
711 | |
712 int CodeCache::mark_for_deoptimization(methodOop dependee) { | |
713 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
714 int number_of_marked_CodeBlobs = 0; | |
715 | |
716 FOR_ALL_ALIVE_NMETHODS(nm) { | |
717 if (nm->is_dependent_on_method(dependee)) { | |
718 ResourceMark rm; | |
719 nm->mark_for_deoptimization(); | |
720 number_of_marked_CodeBlobs++; | |
721 } | |
722 } | |
723 | |
724 return number_of_marked_CodeBlobs; | |
725 } | |
726 | |
727 void CodeCache::make_marked_nmethods_zombies() { | |
728 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
729 FOR_ALL_ALIVE_NMETHODS(nm) { | |
730 if (nm->is_marked_for_deoptimization()) { | |
731 | |
732 // If the nmethod has already been made non-entrant and it can be converted | |
733 // then zombie it now. Otherwise make it non-entrant and it will eventually | |
734 // be zombied when it is no longer seen on the stack. Note that the nmethod | |
735 // might be "entrant" and not on the stack and so could be zombied immediately | |
736 // but we can't tell because we don't track it on stack until it becomes | |
737 // non-entrant. | |
738 | |
739 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) { | |
740 nm->make_zombie(); | |
741 } else { | |
742 nm->make_not_entrant(); | |
743 } | |
744 } | |
745 } | |
746 } | |
747 | |
748 void CodeCache::make_marked_nmethods_not_entrant() { | |
749 assert_locked_or_safepoint(CodeCache_lock); | |
750 FOR_ALL_ALIVE_NMETHODS(nm) { | |
751 if (nm->is_marked_for_deoptimization()) { | |
752 nm->make_not_entrant(); | |
753 } | |
754 } | |
755 } | |
756 | |
757 void CodeCache::verify() { | |
758 _heap->verify(); | |
759 FOR_ALL_ALIVE_BLOBS(p) { | |
760 p->verify(); | |
761 } | |
762 } | |
763 | |
764 //------------------------------------------------------------------------------------------------ | |
765 // Non-product version | |
766 | |
767 #ifndef PRODUCT | |
768 | |
769 void CodeCache::verify_if_often() { | |
770 if (VerifyCodeCacheOften) { | |
771 _heap->verify(); | |
772 } | |
773 } | |
774 | |
989 | 775 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) { |
776 if (PrintCodeCache2) { // Need to add a new flag | |
777 ResourceMark rm; | |
778 if (size == 0) size = cb->size(); | |
779 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size); | |
780 } | |
781 } | |
782 | |
0 | 783 void CodeCache::print_internals() { |
784 int nmethodCount = 0; | |
785 int runtimeStubCount = 0; | |
786 int adapterCount = 0; | |
787 int deoptimizationStubCount = 0; | |
788 int uncommonTrapStubCount = 0; | |
789 int bufferBlobCount = 0; | |
790 int total = 0; | |
791 int nmethodAlive = 0; | |
792 int nmethodNotEntrant = 0; | |
793 int nmethodZombie = 0; | |
794 int nmethodUnloaded = 0; | |
795 int nmethodJava = 0; | |
796 int nmethodNative = 0; | |
797 int maxCodeSize = 0; | |
798 ResourceMark rm; | |
799 | |
800 CodeBlob *cb; | |
801 for (cb = first(); cb != NULL; cb = next(cb)) { | |
802 total++; | |
803 if (cb->is_nmethod()) { | |
804 nmethod* nm = (nmethod*)cb; | |
805 | |
806 if (Verbose && nm->method() != NULL) { | |
807 ResourceMark rm; | |
808 char *method_name = nm->method()->name_and_sig_as_C_string(); | |
809 tty->print("%s", method_name); | |
810 if(nm->is_alive()) { tty->print_cr(" alive"); } | |
811 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); } | |
812 if(nm->is_zombie()) { tty->print_cr(" zombie"); } | |
813 } | |
814 | |
815 nmethodCount++; | |
816 | |
817 if(nm->is_alive()) { nmethodAlive++; } | |
818 if(nm->is_not_entrant()) { nmethodNotEntrant++; } | |
819 if(nm->is_zombie()) { nmethodZombie++; } | |
820 if(nm->is_unloaded()) { nmethodUnloaded++; } | |
821 if(nm->is_native_method()) { nmethodNative++; } | |
822 | |
823 if(nm->method() != NULL && nm->is_java_method()) { | |
824 nmethodJava++; | |
1748 | 825 if (nm->insts_size() > maxCodeSize) { |
826 maxCodeSize = nm->insts_size(); | |
0 | 827 } |
828 } | |
829 } else if (cb->is_runtime_stub()) { | |
830 runtimeStubCount++; | |
831 } else if (cb->is_deoptimization_stub()) { | |
832 deoptimizationStubCount++; | |
833 } else if (cb->is_uncommon_trap_stub()) { | |
834 uncommonTrapStubCount++; | |
835 } else if (cb->is_adapter_blob()) { | |
836 adapterCount++; | |
837 } else if (cb->is_buffer_blob()) { | |
838 bufferBlobCount++; | |
839 } | |
840 } | |
841 | |
842 int bucketSize = 512; | |
843 int bucketLimit = maxCodeSize / bucketSize + 1; | |
844 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit); | |
845 memset(buckets,0,sizeof(int) * bucketLimit); | |
846 | |
847 for (cb = first(); cb != NULL; cb = next(cb)) { | |
848 if (cb->is_nmethod()) { | |
849 nmethod* nm = (nmethod*)cb; | |
850 if(nm->is_java_method()) { | |
1748 | 851 buckets[nm->insts_size() / bucketSize]++; |
0 | 852 } |
853 } | |
854 } | |
855 tty->print_cr("Code Cache Entries (total of %d)",total); | |
856 tty->print_cr("-------------------------------------------------"); | |
857 tty->print_cr("nmethods: %d",nmethodCount); | |
858 tty->print_cr("\talive: %d",nmethodAlive); | |
859 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant); | |
860 tty->print_cr("\tzombie: %d",nmethodZombie); | |
861 tty->print_cr("\tunloaded: %d",nmethodUnloaded); | |
862 tty->print_cr("\tjava: %d",nmethodJava); | |
863 tty->print_cr("\tnative: %d",nmethodNative); | |
864 tty->print_cr("runtime_stubs: %d",runtimeStubCount); | |
865 tty->print_cr("adapters: %d",adapterCount); | |
866 tty->print_cr("buffer blobs: %d",bufferBlobCount); | |
867 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount); | |
868 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount); | |
869 tty->print_cr("\nnmethod size distribution (non-zombie java)"); | |
870 tty->print_cr("-------------------------------------------------"); | |
871 | |
872 for(int i=0; i<bucketLimit; i++) { | |
873 if(buckets[i] != 0) { | |
874 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize); | |
875 tty->fill_to(40); | |
876 tty->print_cr("%d",buckets[i]); | |
877 } | |
878 } | |
879 | |
880 FREE_C_HEAP_ARRAY(int, buckets); | |
881 } | |
882 | |
883 void CodeCache::print() { | |
884 CodeBlob_sizes live; | |
885 CodeBlob_sizes dead; | |
886 | |
887 FOR_ALL_BLOBS(p) { | |
888 if (!p->is_alive()) { | |
889 dead.add(p); | |
890 } else { | |
891 live.add(p); | |
892 } | |
893 } | |
894 | |
895 tty->print_cr("CodeCache:"); | |
896 | |
897 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(), | |
898 dependentCheckTime.seconds() / dependentCheckCount); | |
899 | |
900 if (!live.is_empty()) { | |
901 live.print("live"); | |
902 } | |
903 if (!dead.is_empty()) { | |
904 dead.print("dead"); | |
905 } | |
906 | |
907 | |
908 if (Verbose) { | |
909 // print the oop_map usage | |
910 int code_size = 0; | |
911 int number_of_blobs = 0; | |
912 int number_of_oop_maps = 0; | |
913 int map_size = 0; | |
914 FOR_ALL_BLOBS(p) { | |
915 if (p->is_alive()) { | |
916 number_of_blobs++; | |
1748 | 917 code_size += p->code_size(); |
0 | 918 OopMapSet* set = p->oop_maps(); |
919 if (set != NULL) { | |
920 number_of_oop_maps += set->size(); | |
1748 | 921 map_size += set->heap_size(); |
0 | 922 } |
923 } | |
924 } | |
925 tty->print_cr("OopMaps"); | |
926 tty->print_cr(" #blobs = %d", number_of_blobs); | |
927 tty->print_cr(" code size = %d", code_size); | |
928 tty->print_cr(" #oop_maps = %d", number_of_oop_maps); | |
929 tty->print_cr(" map size = %d", map_size); | |
930 } | |
931 | |
932 } | |
933 | |
934 #endif // PRODUCT | |
1907 | 935 |
936 void CodeCache::print_bounds(outputStream* st) { | |
937 st->print_cr("Code Cache [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
938 _heap->low_boundary(), | |
939 _heap->high(), | |
940 _heap->high_boundary()); | |
941 st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT | |
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942 " adapters=" UINT32_FORMAT " free_code_cache=" SIZE_FORMAT |
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943 " largest_free_block=" SIZE_FORMAT, |
1907 | 944 CodeCache::nof_blobs(), CodeCache::nof_nmethods(), |
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945 CodeCache::nof_adapters(), CodeCache::unallocated_capacity(), |
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946 CodeCache::largest_free_block()); |
1907 | 947 } |