Mercurial > hg > truffle
annotate src/share/vm/code/codeCache.cpp @ 1563:1a5913bf5e19
6951083: oops and relocations should part of nmethod not CodeBlob
Summary: This moves the oops from Codeblob to nmethod.
Reviewed-by: kvn, never
author | twisti |
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date | Thu, 20 May 2010 06:34:23 -0700 |
parents | bfe29ec02863 |
children | e9ff18c4ace7 |
rev | line source |
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0 | 1 /* |
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2 * Copyright 1997-2010 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/_codeCache.cpp.incl" | |
27 | |
28 // Helper class for printing in CodeCache | |
29 | |
30 class CodeBlob_sizes { | |
31 private: | |
32 int count; | |
33 int total_size; | |
34 int header_size; | |
35 int code_size; | |
36 int stub_size; | |
37 int relocation_size; | |
38 int scopes_oop_size; | |
39 int scopes_data_size; | |
40 int scopes_pcs_size; | |
41 | |
42 public: | |
43 CodeBlob_sizes() { | |
44 count = 0; | |
45 total_size = 0; | |
46 header_size = 0; | |
47 code_size = 0; | |
48 stub_size = 0; | |
49 relocation_size = 0; | |
50 scopes_oop_size = 0; | |
51 scopes_data_size = 0; | |
52 scopes_pcs_size = 0; | |
53 } | |
54 | |
55 int total() { return total_size; } | |
56 bool is_empty() { return count == 0; } | |
57 | |
58 void print(const char* title) { | |
59 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])", | |
60 count, | |
61 title, | |
62 total() / K, | |
63 header_size * 100 / total_size, | |
64 relocation_size * 100 / total_size, | |
65 code_size * 100 / total_size, | |
66 stub_size * 100 / total_size, | |
67 scopes_oop_size * 100 / total_size, | |
68 scopes_data_size * 100 / total_size, | |
69 scopes_pcs_size * 100 / total_size); | |
70 } | |
71 | |
72 void add(CodeBlob* cb) { | |
73 count++; | |
74 total_size += cb->size(); | |
75 header_size += cb->header_size(); | |
76 relocation_size += cb->relocation_size(); | |
77 if (cb->is_nmethod()) { | |
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78 nmethod* nm = cb->as_nmethod_or_null(); |
0 | 79 code_size += nm->code_size(); |
80 stub_size += nm->stub_size(); | |
81 | |
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82 scopes_oop_size += nm->oops_size(); |
0 | 83 scopes_data_size += nm->scopes_data_size(); |
84 scopes_pcs_size += nm->scopes_pcs_size(); | |
85 } else { | |
86 code_size += cb->instructions_size(); | |
87 } | |
88 } | |
89 }; | |
90 | |
91 | |
92 // CodeCache implementation | |
93 | |
94 CodeHeap * CodeCache::_heap = new CodeHeap(); | |
95 int CodeCache::_number_of_blobs = 0; | |
96 int CodeCache::_number_of_nmethods_with_dependencies = 0; | |
97 bool CodeCache::_needs_cache_clean = false; | |
989 | 98 nmethod* CodeCache::_scavenge_root_nmethods = NULL; |
1202 | 99 nmethod* CodeCache::_saved_nmethods = NULL; |
0 | 100 |
101 | |
102 CodeBlob* CodeCache::first() { | |
103 assert_locked_or_safepoint(CodeCache_lock); | |
104 return (CodeBlob*)_heap->first(); | |
105 } | |
106 | |
107 | |
108 CodeBlob* CodeCache::next(CodeBlob* cb) { | |
109 assert_locked_or_safepoint(CodeCache_lock); | |
110 return (CodeBlob*)_heap->next(cb); | |
111 } | |
112 | |
113 | |
114 CodeBlob* CodeCache::alive(CodeBlob *cb) { | |
115 assert_locked_or_safepoint(CodeCache_lock); | |
116 while (cb != NULL && !cb->is_alive()) cb = next(cb); | |
117 return cb; | |
118 } | |
119 | |
120 | |
121 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) { | |
122 assert_locked_or_safepoint(CodeCache_lock); | |
123 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb); | |
124 return (nmethod*)cb; | |
125 } | |
126 | |
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127 nmethod* CodeCache::first_nmethod() { |
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128 assert_locked_or_safepoint(CodeCache_lock); |
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129 CodeBlob* cb = first(); |
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130 while (cb != NULL && !cb->is_nmethod()) { |
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131 cb = next(cb); |
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132 } |
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133 return (nmethod*)cb; |
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134 } |
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135 |
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136 nmethod* CodeCache::next_nmethod (CodeBlob* cb) { |
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137 assert_locked_or_safepoint(CodeCache_lock); |
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138 cb = next(cb); |
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139 while (cb != NULL && !cb->is_nmethod()) { |
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140 cb = next(cb); |
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141 } |
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142 return (nmethod*)cb; |
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143 } |
0 | 144 |
145 CodeBlob* CodeCache::allocate(int size) { | |
146 // Do not seize the CodeCache lock here--if the caller has not | |
147 // already done so, we are going to lose bigtime, since the code | |
148 // cache will contain a garbage CodeBlob until the caller can | |
149 // run the constructor for the CodeBlob subclass he is busy | |
150 // instantiating. | |
151 guarantee(size >= 0, "allocation request must be reasonable"); | |
152 assert_locked_or_safepoint(CodeCache_lock); | |
153 CodeBlob* cb = NULL; | |
154 _number_of_blobs++; | |
155 while (true) { | |
156 cb = (CodeBlob*)_heap->allocate(size); | |
157 if (cb != NULL) break; | |
158 if (!_heap->expand_by(CodeCacheExpansionSize)) { | |
159 // Expansion failed | |
160 return NULL; | |
161 } | |
162 if (PrintCodeCacheExtension) { | |
163 ResourceMark rm; | |
164 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)", | |
165 (intptr_t)_heap->begin(), (intptr_t)_heap->end(), | |
166 (address)_heap->end() - (address)_heap->begin()); | |
167 } | |
168 } | |
169 verify_if_often(); | |
989 | 170 print_trace("allocation", cb, size); |
0 | 171 return cb; |
172 } | |
173 | |
174 void CodeCache::free(CodeBlob* cb) { | |
175 assert_locked_or_safepoint(CodeCache_lock); | |
176 verify_if_often(); | |
177 | |
989 | 178 print_trace("free", cb); |
0 | 179 if (cb->is_nmethod() && ((nmethod *)cb)->has_dependencies()) { |
180 _number_of_nmethods_with_dependencies--; | |
181 } | |
182 _number_of_blobs--; | |
183 | |
184 _heap->deallocate(cb); | |
185 | |
186 verify_if_often(); | |
187 assert(_number_of_blobs >= 0, "sanity check"); | |
188 } | |
189 | |
190 | |
191 void CodeCache::commit(CodeBlob* cb) { | |
192 // this is called by nmethod::nmethod, which must already own CodeCache_lock | |
193 assert_locked_or_safepoint(CodeCache_lock); | |
194 if (cb->is_nmethod() && ((nmethod *)cb)->has_dependencies()) { | |
195 _number_of_nmethods_with_dependencies++; | |
196 } | |
197 // flush the hardware I-cache | |
198 ICache::invalidate_range(cb->instructions_begin(), cb->instructions_size()); | |
199 } | |
200 | |
201 | |
202 void CodeCache::flush() { | |
203 assert_locked_or_safepoint(CodeCache_lock); | |
204 Unimplemented(); | |
205 } | |
206 | |
207 | |
208 // Iteration over CodeBlobs | |
209 | |
210 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) ) | |
211 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var))) | |
212 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var))) | |
213 | |
214 | |
215 bool CodeCache::contains(void *p) { | |
216 // It should be ok to call contains without holding a lock | |
217 return _heap->contains(p); | |
218 } | |
219 | |
220 | |
221 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not | |
222 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain | |
223 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled. | |
224 CodeBlob* CodeCache::find_blob(void* start) { | |
225 CodeBlob* result = find_blob_unsafe(start); | |
226 if (result == NULL) return NULL; | |
227 // We could potientially look up non_entrant methods | |
228 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method"); | |
229 return result; | |
230 } | |
231 | |
232 nmethod* CodeCache::find_nmethod(void* start) { | |
233 CodeBlob *cb = find_blob(start); | |
234 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod"); | |
235 return (nmethod*)cb; | |
236 } | |
237 | |
238 | |
239 void CodeCache::blobs_do(void f(CodeBlob* nm)) { | |
240 assert_locked_or_safepoint(CodeCache_lock); | |
241 FOR_ALL_BLOBS(p) { | |
242 f(p); | |
243 } | |
244 } | |
245 | |
246 | |
247 void CodeCache::nmethods_do(void f(nmethod* nm)) { | |
248 assert_locked_or_safepoint(CodeCache_lock); | |
249 FOR_ALL_BLOBS(nm) { | |
250 if (nm->is_nmethod()) f((nmethod*)nm); | |
251 } | |
252 } | |
253 | |
254 | |
255 int CodeCache::alignment_unit() { | |
256 return (int)_heap->alignment_unit(); | |
257 } | |
258 | |
259 | |
260 int CodeCache::alignment_offset() { | |
261 return (int)_heap->alignment_offset(); | |
262 } | |
263 | |
264 | |
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265 // Mark nmethods for unloading if they contain otherwise unreachable |
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266 // oops. |
0 | 267 void CodeCache::do_unloading(BoolObjectClosure* is_alive, |
268 OopClosure* keep_alive, | |
269 bool unloading_occurred) { | |
270 assert_locked_or_safepoint(CodeCache_lock); | |
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271 FOR_ALL_ALIVE_NMETHODS(nm) { |
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272 nm->do_unloading(is_alive, keep_alive, unloading_occurred); |
0 | 273 } |
274 } | |
275 | |
989 | 276 void CodeCache::blobs_do(CodeBlobClosure* f) { |
0 | 277 assert_locked_or_safepoint(CodeCache_lock); |
278 FOR_ALL_ALIVE_BLOBS(cb) { | |
989 | 279 f->do_code_blob(cb); |
280 | |
281 #ifdef ASSERT | |
282 if (cb->is_nmethod()) | |
283 ((nmethod*)cb)->verify_scavenge_root_oops(); | |
284 #endif //ASSERT | |
0 | 285 } |
286 } | |
287 | |
989 | 288 // Walk the list of methods which might contain non-perm oops. |
289 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) { | |
290 assert_locked_or_safepoint(CodeCache_lock); | |
291 debug_only(mark_scavenge_root_nmethods()); | |
292 | |
293 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
294 debug_only(cur->clear_scavenge_root_marked()); | |
295 assert(cur->scavenge_root_not_marked(), ""); | |
296 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
297 | |
298 bool is_live = (!cur->is_zombie() && !cur->is_unloaded()); | |
299 #ifndef PRODUCT | |
300 if (TraceScavenge) { | |
301 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr(); | |
302 } | |
303 #endif //PRODUCT | |
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304 if (is_live) { |
989 | 305 // Perform cur->oops_do(f), maybe just once per nmethod. |
306 f->do_code_blob(cur); | |
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307 cur->fix_oop_relocations(); |
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308 } |
989 | 309 } |
310 | |
311 // Check for stray marks. | |
312 debug_only(verify_perm_nmethods(NULL)); | |
313 } | |
314 | |
315 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) { | |
316 assert_locked_or_safepoint(CodeCache_lock); | |
317 nm->set_on_scavenge_root_list(); | |
318 nm->set_scavenge_root_link(_scavenge_root_nmethods); | |
319 set_scavenge_root_nmethods(nm); | |
320 print_trace("add_scavenge_root", nm); | |
321 } | |
322 | |
323 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) { | |
324 assert_locked_or_safepoint(CodeCache_lock); | |
325 print_trace("drop_scavenge_root", nm); | |
326 nmethod* last = NULL; | |
327 nmethod* cur = scavenge_root_nmethods(); | |
328 while (cur != NULL) { | |
329 nmethod* next = cur->scavenge_root_link(); | |
330 if (cur == nm) { | |
331 if (last != NULL) | |
332 last->set_scavenge_root_link(next); | |
333 else set_scavenge_root_nmethods(next); | |
334 nm->set_scavenge_root_link(NULL); | |
335 nm->clear_on_scavenge_root_list(); | |
336 return; | |
337 } | |
338 last = cur; | |
339 cur = next; | |
340 } | |
341 assert(false, "should have been on list"); | |
342 } | |
343 | |
344 void CodeCache::prune_scavenge_root_nmethods() { | |
345 assert_locked_or_safepoint(CodeCache_lock); | |
346 debug_only(mark_scavenge_root_nmethods()); | |
347 | |
348 nmethod* last = NULL; | |
349 nmethod* cur = scavenge_root_nmethods(); | |
350 while (cur != NULL) { | |
351 nmethod* next = cur->scavenge_root_link(); | |
352 debug_only(cur->clear_scavenge_root_marked()); | |
353 assert(cur->scavenge_root_not_marked(), ""); | |
354 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
355 | |
356 if (!cur->is_zombie() && !cur->is_unloaded() | |
357 && cur->detect_scavenge_root_oops()) { | |
358 // Keep it. Advance 'last' to prevent deletion. | |
359 last = cur; | |
360 } else { | |
361 // Prune it from the list, so we don't have to look at it any more. | |
362 print_trace("prune_scavenge_root", cur); | |
363 cur->set_scavenge_root_link(NULL); | |
364 cur->clear_on_scavenge_root_list(); | |
365 if (last != NULL) | |
366 last->set_scavenge_root_link(next); | |
367 else set_scavenge_root_nmethods(next); | |
368 } | |
369 cur = next; | |
370 } | |
371 | |
372 // Check for stray marks. | |
373 debug_only(verify_perm_nmethods(NULL)); | |
374 } | |
375 | |
376 #ifndef PRODUCT | |
377 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) { | |
378 // While we are here, verify the integrity of the list. | |
379 mark_scavenge_root_nmethods(); | |
380 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
381 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
382 cur->clear_scavenge_root_marked(); | |
383 } | |
384 verify_perm_nmethods(f); | |
385 } | |
386 | |
387 // Temporarily mark nmethods that are claimed to be on the non-perm list. | |
388 void CodeCache::mark_scavenge_root_nmethods() { | |
389 FOR_ALL_ALIVE_BLOBS(cb) { | |
390 if (cb->is_nmethod()) { | |
391 nmethod *nm = (nmethod*)cb; | |
392 assert(nm->scavenge_root_not_marked(), "clean state"); | |
393 if (nm->on_scavenge_root_list()) | |
394 nm->set_scavenge_root_marked(); | |
395 } | |
396 } | |
397 } | |
398 | |
399 // If the closure is given, run it on the unlisted nmethods. | |
400 // Also make sure that the effects of mark_scavenge_root_nmethods is gone. | |
401 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) { | |
402 FOR_ALL_ALIVE_BLOBS(cb) { | |
403 bool call_f = (f_or_null != NULL); | |
404 if (cb->is_nmethod()) { | |
405 nmethod *nm = (nmethod*)cb; | |
406 assert(nm->scavenge_root_not_marked(), "must be already processed"); | |
407 if (nm->on_scavenge_root_list()) | |
408 call_f = false; // don't show this one to the client | |
409 nm->verify_scavenge_root_oops(); | |
410 } else { | |
411 call_f = false; // not an nmethod | |
412 } | |
413 if (call_f) f_or_null->do_code_blob(cb); | |
414 } | |
415 } | |
416 #endif //PRODUCT | |
417 | |
1202 | 418 |
419 nmethod* CodeCache::find_and_remove_saved_code(methodOop m) { | |
420 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
421 nmethod* saved = _saved_nmethods; | |
422 nmethod* prev = NULL; | |
423 while (saved != NULL) { | |
424 if (saved->is_in_use() && saved->method() == m) { | |
425 if (prev != NULL) { | |
426 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
427 } else { | |
428 _saved_nmethods = saved->saved_nmethod_link(); | |
429 } | |
430 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods"); | |
431 saved->set_speculatively_disconnected(false); | |
432 saved->set_saved_nmethod_link(NULL); | |
433 if (PrintMethodFlushing) { | |
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434 saved->print_on(tty, " ### nmethod is reconnected\n"); |
1202 | 435 } |
436 if (LogCompilation && (xtty != NULL)) { | |
437 ttyLocker ttyl; | |
438 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id()); | |
439 xtty->method(methodOop(m)); | |
440 xtty->stamp(); | |
441 xtty->end_elem(); | |
442 } | |
443 return saved; | |
444 } | |
445 prev = saved; | |
446 saved = saved->saved_nmethod_link(); | |
447 } | |
448 return NULL; | |
449 } | |
450 | |
451 void CodeCache::remove_saved_code(nmethod* nm) { | |
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452 // For conc swpr this will be called with CodeCache_lock taken by caller |
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453 assert_locked_or_safepoint(CodeCache_lock); |
1202 | 454 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods"); |
455 nmethod* saved = _saved_nmethods; | |
456 nmethod* prev = NULL; | |
457 while (saved != NULL) { | |
458 if (saved == nm) { | |
459 if (prev != NULL) { | |
460 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
461 } else { | |
462 _saved_nmethods = saved->saved_nmethod_link(); | |
463 } | |
464 if (LogCompilation && (xtty != NULL)) { | |
465 ttyLocker ttyl; | |
466 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id()); | |
467 xtty->stamp(); | |
468 xtty->end_elem(); | |
469 } | |
470 return; | |
471 } | |
472 prev = saved; | |
473 saved = saved->saved_nmethod_link(); | |
474 } | |
475 ShouldNotReachHere(); | |
476 } | |
477 | |
478 void CodeCache::speculatively_disconnect(nmethod* nm) { | |
479 assert_locked_or_safepoint(CodeCache_lock); | |
480 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods"); | |
481 nm->set_saved_nmethod_link(_saved_nmethods); | |
482 _saved_nmethods = nm; | |
483 if (PrintMethodFlushing) { | |
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484 nm->print_on(tty, " ### nmethod is speculatively disconnected\n"); |
1202 | 485 } |
486 if (LogCompilation && (xtty != NULL)) { | |
487 ttyLocker ttyl; | |
488 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id()); | |
489 xtty->method(methodOop(nm->method())); | |
490 xtty->stamp(); | |
491 xtty->end_elem(); | |
492 } | |
493 nm->method()->clear_code(); | |
494 nm->set_speculatively_disconnected(true); | |
495 } | |
496 | |
497 | |
0 | 498 void CodeCache::gc_prologue() { |
989 | 499 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called"); |
0 | 500 } |
501 | |
502 | |
503 void CodeCache::gc_epilogue() { | |
504 assert_locked_or_safepoint(CodeCache_lock); | |
505 FOR_ALL_ALIVE_BLOBS(cb) { | |
506 if (cb->is_nmethod()) { | |
507 nmethod *nm = (nmethod*)cb; | |
508 assert(!nm->is_unloaded(), "Tautology"); | |
509 if (needs_cache_clean()) { | |
510 nm->cleanup_inline_caches(); | |
511 } | |
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512 DEBUG_ONLY(nm->verify()); |
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513 nm->fix_oop_relocations(); |
0 | 514 } |
515 } | |
516 set_needs_cache_clean(false); | |
989 | 517 prune_scavenge_root_nmethods(); |
518 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); | |
0 | 519 } |
520 | |
521 | |
522 address CodeCache::first_address() { | |
523 assert_locked_or_safepoint(CodeCache_lock); | |
524 return (address)_heap->begin(); | |
525 } | |
526 | |
527 | |
528 address CodeCache::last_address() { | |
529 assert_locked_or_safepoint(CodeCache_lock); | |
530 return (address)_heap->end(); | |
531 } | |
532 | |
533 | |
534 void icache_init(); | |
535 | |
536 void CodeCache::initialize() { | |
537 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points"); | |
538 #ifdef COMPILER2 | |
539 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops"); | |
540 #endif | |
541 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants"); | |
542 // This was originally just a check of the alignment, causing failure, instead, round | |
543 // the code cache to the page size. In particular, Solaris is moving to a larger | |
544 // default page size. | |
545 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size()); | |
546 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size()); | |
547 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size()); | |
548 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) { | |
549 vm_exit_during_initialization("Could not reserve enough space for code cache"); | |
550 } | |
551 | |
552 MemoryService::add_code_heap_memory_pool(_heap); | |
553 | |
554 // Initialize ICache flush mechanism | |
555 // This service is needed for os::register_code_area | |
556 icache_init(); | |
557 | |
558 // Give OS a chance to register generated code area. | |
559 // This is used on Windows 64 bit platforms to register | |
560 // Structured Exception Handlers for our generated code. | |
561 os::register_code_area(_heap->low_boundary(), _heap->high_boundary()); | |
562 } | |
563 | |
564 | |
565 void codeCache_init() { | |
566 CodeCache::initialize(); | |
567 } | |
568 | |
569 //------------------------------------------------------------------------------------------------ | |
570 | |
571 int CodeCache::number_of_nmethods_with_dependencies() { | |
572 return _number_of_nmethods_with_dependencies; | |
573 } | |
574 | |
575 void CodeCache::clear_inline_caches() { | |
576 assert_locked_or_safepoint(CodeCache_lock); | |
577 FOR_ALL_ALIVE_NMETHODS(nm) { | |
578 nm->clear_inline_caches(); | |
579 } | |
580 } | |
581 | |
582 #ifndef PRODUCT | |
583 // used to keep track of how much time is spent in mark_for_deoptimization | |
584 static elapsedTimer dependentCheckTime; | |
585 static int dependentCheckCount = 0; | |
586 #endif // PRODUCT | |
587 | |
588 | |
589 int CodeCache::mark_for_deoptimization(DepChange& changes) { | |
590 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
591 | |
592 #ifndef PRODUCT | |
593 dependentCheckTime.start(); | |
594 dependentCheckCount++; | |
595 #endif // PRODUCT | |
596 | |
597 int number_of_marked_CodeBlobs = 0; | |
598 | |
599 // search the hierarchy looking for nmethods which are affected by the loading of this class | |
600 | |
601 // then search the interfaces this class implements looking for nmethods | |
602 // which might be dependent of the fact that an interface only had one | |
603 // implementor. | |
604 | |
605 { No_Safepoint_Verifier nsv; | |
606 for (DepChange::ContextStream str(changes, nsv); str.next(); ) { | |
607 klassOop d = str.klass(); | |
608 number_of_marked_CodeBlobs += instanceKlass::cast(d)->mark_dependent_nmethods(changes); | |
609 } | |
610 } | |
611 | |
612 if (VerifyDependencies) { | |
613 // Turn off dependency tracing while actually testing deps. | |
614 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); | |
615 FOR_ALL_ALIVE_NMETHODS(nm) { | |
616 if (!nm->is_marked_for_deoptimization() && | |
617 nm->check_all_dependencies()) { | |
618 ResourceMark rm; | |
619 tty->print_cr("Should have been marked for deoptimization:"); | |
620 changes.print(); | |
621 nm->print(); | |
622 nm->print_dependencies(); | |
623 } | |
624 } | |
625 } | |
626 | |
627 #ifndef PRODUCT | |
628 dependentCheckTime.stop(); | |
629 #endif // PRODUCT | |
630 | |
631 return number_of_marked_CodeBlobs; | |
632 } | |
633 | |
634 | |
635 #ifdef HOTSWAP | |
636 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) { | |
637 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
638 int number_of_marked_CodeBlobs = 0; | |
639 | |
640 // Deoptimize all methods of the evolving class itself | |
641 objArrayOop old_methods = dependee->methods(); | |
642 for (int i = 0; i < old_methods->length(); i++) { | |
643 ResourceMark rm; | |
644 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
645 nmethod *nm = old_method->code(); | |
646 if (nm != NULL) { | |
647 nm->mark_for_deoptimization(); | |
648 number_of_marked_CodeBlobs++; | |
649 } | |
650 } | |
651 | |
652 FOR_ALL_ALIVE_NMETHODS(nm) { | |
653 if (nm->is_marked_for_deoptimization()) { | |
654 // ...Already marked in the previous pass; don't count it again. | |
655 } else if (nm->is_evol_dependent_on(dependee())) { | |
656 ResourceMark rm; | |
657 nm->mark_for_deoptimization(); | |
658 number_of_marked_CodeBlobs++; | |
659 } else { | |
660 // flush caches in case they refer to a redefined methodOop | |
661 nm->clear_inline_caches(); | |
662 } | |
663 } | |
664 | |
665 return number_of_marked_CodeBlobs; | |
666 } | |
667 #endif // HOTSWAP | |
668 | |
669 | |
670 // Deoptimize all methods | |
671 void CodeCache::mark_all_nmethods_for_deoptimization() { | |
672 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
673 FOR_ALL_ALIVE_NMETHODS(nm) { | |
674 nm->mark_for_deoptimization(); | |
675 } | |
676 } | |
677 | |
678 | |
679 int CodeCache::mark_for_deoptimization(methodOop dependee) { | |
680 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
681 int number_of_marked_CodeBlobs = 0; | |
682 | |
683 FOR_ALL_ALIVE_NMETHODS(nm) { | |
684 if (nm->is_dependent_on_method(dependee)) { | |
685 ResourceMark rm; | |
686 nm->mark_for_deoptimization(); | |
687 number_of_marked_CodeBlobs++; | |
688 } | |
689 } | |
690 | |
691 return number_of_marked_CodeBlobs; | |
692 } | |
693 | |
694 void CodeCache::make_marked_nmethods_zombies() { | |
695 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
696 FOR_ALL_ALIVE_NMETHODS(nm) { | |
697 if (nm->is_marked_for_deoptimization()) { | |
698 | |
699 // If the nmethod has already been made non-entrant and it can be converted | |
700 // then zombie it now. Otherwise make it non-entrant and it will eventually | |
701 // be zombied when it is no longer seen on the stack. Note that the nmethod | |
702 // might be "entrant" and not on the stack and so could be zombied immediately | |
703 // but we can't tell because we don't track it on stack until it becomes | |
704 // non-entrant. | |
705 | |
706 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) { | |
707 nm->make_zombie(); | |
708 } else { | |
709 nm->make_not_entrant(); | |
710 } | |
711 } | |
712 } | |
713 } | |
714 | |
715 void CodeCache::make_marked_nmethods_not_entrant() { | |
716 assert_locked_or_safepoint(CodeCache_lock); | |
717 FOR_ALL_ALIVE_NMETHODS(nm) { | |
718 if (nm->is_marked_for_deoptimization()) { | |
719 nm->make_not_entrant(); | |
720 } | |
721 } | |
722 } | |
723 | |
724 void CodeCache::verify() { | |
725 _heap->verify(); | |
726 FOR_ALL_ALIVE_BLOBS(p) { | |
727 p->verify(); | |
728 } | |
729 } | |
730 | |
731 //------------------------------------------------------------------------------------------------ | |
732 // Non-product version | |
733 | |
734 #ifndef PRODUCT | |
735 | |
736 void CodeCache::verify_if_often() { | |
737 if (VerifyCodeCacheOften) { | |
738 _heap->verify(); | |
739 } | |
740 } | |
741 | |
989 | 742 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) { |
743 if (PrintCodeCache2) { // Need to add a new flag | |
744 ResourceMark rm; | |
745 if (size == 0) size = cb->size(); | |
746 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size); | |
747 } | |
748 } | |
749 | |
0 | 750 void CodeCache::print_internals() { |
751 int nmethodCount = 0; | |
752 int runtimeStubCount = 0; | |
753 int adapterCount = 0; | |
754 int deoptimizationStubCount = 0; | |
755 int uncommonTrapStubCount = 0; | |
756 int bufferBlobCount = 0; | |
757 int total = 0; | |
758 int nmethodAlive = 0; | |
759 int nmethodNotEntrant = 0; | |
760 int nmethodZombie = 0; | |
761 int nmethodUnloaded = 0; | |
762 int nmethodJava = 0; | |
763 int nmethodNative = 0; | |
764 int maxCodeSize = 0; | |
765 ResourceMark rm; | |
766 | |
767 CodeBlob *cb; | |
768 for (cb = first(); cb != NULL; cb = next(cb)) { | |
769 total++; | |
770 if (cb->is_nmethod()) { | |
771 nmethod* nm = (nmethod*)cb; | |
772 | |
773 if (Verbose && nm->method() != NULL) { | |
774 ResourceMark rm; | |
775 char *method_name = nm->method()->name_and_sig_as_C_string(); | |
776 tty->print("%s", method_name); | |
777 if(nm->is_alive()) { tty->print_cr(" alive"); } | |
778 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); } | |
779 if(nm->is_zombie()) { tty->print_cr(" zombie"); } | |
780 } | |
781 | |
782 nmethodCount++; | |
783 | |
784 if(nm->is_alive()) { nmethodAlive++; } | |
785 if(nm->is_not_entrant()) { nmethodNotEntrant++; } | |
786 if(nm->is_zombie()) { nmethodZombie++; } | |
787 if(nm->is_unloaded()) { nmethodUnloaded++; } | |
788 if(nm->is_native_method()) { nmethodNative++; } | |
789 | |
790 if(nm->method() != NULL && nm->is_java_method()) { | |
791 nmethodJava++; | |
792 if(nm->code_size() > maxCodeSize) { | |
793 maxCodeSize = nm->code_size(); | |
794 } | |
795 } | |
796 } else if (cb->is_runtime_stub()) { | |
797 runtimeStubCount++; | |
798 } else if (cb->is_deoptimization_stub()) { | |
799 deoptimizationStubCount++; | |
800 } else if (cb->is_uncommon_trap_stub()) { | |
801 uncommonTrapStubCount++; | |
802 } else if (cb->is_adapter_blob()) { | |
803 adapterCount++; | |
804 } else if (cb->is_buffer_blob()) { | |
805 bufferBlobCount++; | |
806 } | |
807 } | |
808 | |
809 int bucketSize = 512; | |
810 int bucketLimit = maxCodeSize / bucketSize + 1; | |
811 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit); | |
812 memset(buckets,0,sizeof(int) * bucketLimit); | |
813 | |
814 for (cb = first(); cb != NULL; cb = next(cb)) { | |
815 if (cb->is_nmethod()) { | |
816 nmethod* nm = (nmethod*)cb; | |
817 if(nm->is_java_method()) { | |
818 buckets[nm->code_size() / bucketSize]++; | |
819 } | |
820 } | |
821 } | |
822 tty->print_cr("Code Cache Entries (total of %d)",total); | |
823 tty->print_cr("-------------------------------------------------"); | |
824 tty->print_cr("nmethods: %d",nmethodCount); | |
825 tty->print_cr("\talive: %d",nmethodAlive); | |
826 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant); | |
827 tty->print_cr("\tzombie: %d",nmethodZombie); | |
828 tty->print_cr("\tunloaded: %d",nmethodUnloaded); | |
829 tty->print_cr("\tjava: %d",nmethodJava); | |
830 tty->print_cr("\tnative: %d",nmethodNative); | |
831 tty->print_cr("runtime_stubs: %d",runtimeStubCount); | |
832 tty->print_cr("adapters: %d",adapterCount); | |
833 tty->print_cr("buffer blobs: %d",bufferBlobCount); | |
834 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount); | |
835 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount); | |
836 tty->print_cr("\nnmethod size distribution (non-zombie java)"); | |
837 tty->print_cr("-------------------------------------------------"); | |
838 | |
839 for(int i=0; i<bucketLimit; i++) { | |
840 if(buckets[i] != 0) { | |
841 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize); | |
842 tty->fill_to(40); | |
843 tty->print_cr("%d",buckets[i]); | |
844 } | |
845 } | |
846 | |
847 FREE_C_HEAP_ARRAY(int, buckets); | |
848 } | |
849 | |
850 void CodeCache::print() { | |
851 CodeBlob_sizes live; | |
852 CodeBlob_sizes dead; | |
853 | |
854 FOR_ALL_BLOBS(p) { | |
855 if (!p->is_alive()) { | |
856 dead.add(p); | |
857 } else { | |
858 live.add(p); | |
859 } | |
860 } | |
861 | |
862 tty->print_cr("CodeCache:"); | |
863 | |
864 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(), | |
865 dependentCheckTime.seconds() / dependentCheckCount); | |
866 | |
867 if (!live.is_empty()) { | |
868 live.print("live"); | |
869 } | |
870 if (!dead.is_empty()) { | |
871 dead.print("dead"); | |
872 } | |
873 | |
874 | |
875 if (Verbose) { | |
876 // print the oop_map usage | |
877 int code_size = 0; | |
878 int number_of_blobs = 0; | |
879 int number_of_oop_maps = 0; | |
880 int map_size = 0; | |
881 FOR_ALL_BLOBS(p) { | |
882 if (p->is_alive()) { | |
883 number_of_blobs++; | |
884 code_size += p->instructions_size(); | |
885 OopMapSet* set = p->oop_maps(); | |
886 if (set != NULL) { | |
887 number_of_oop_maps += set->size(); | |
888 map_size += set->heap_size(); | |
889 } | |
890 } | |
891 } | |
892 tty->print_cr("OopMaps"); | |
893 tty->print_cr(" #blobs = %d", number_of_blobs); | |
894 tty->print_cr(" code size = %d", code_size); | |
895 tty->print_cr(" #oop_maps = %d", number_of_oop_maps); | |
896 tty->print_cr(" map size = %d", map_size); | |
897 } | |
898 | |
899 } | |
900 | |
901 #endif // PRODUCT |