Mercurial > hg > truffle
annotate src/share/vm/code/codeCache.cpp @ 2375:d673ef06fe96
7028374: race in fix_oop_relocations for scavengeable nmethods
Reviewed-by: kvn
| author | never |
|---|---|
| date | Fri, 18 Mar 2011 15:52:42 -0700 |
| parents | 1c0cf339481b |
| children | c7f3d0b4570f |
| rev | line source |
|---|---|
| 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 } |
| 989 | 341 } |
| 342 | |
| 343 // Check for stray marks. | |
| 344 debug_only(verify_perm_nmethods(NULL)); | |
| 345 } | |
| 346 | |
| 347 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) { | |
| 348 assert_locked_or_safepoint(CodeCache_lock); | |
| 349 nm->set_on_scavenge_root_list(); | |
| 350 nm->set_scavenge_root_link(_scavenge_root_nmethods); | |
| 351 set_scavenge_root_nmethods(nm); | |
| 352 print_trace("add_scavenge_root", nm); | |
| 353 } | |
| 354 | |
| 355 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) { | |
| 356 assert_locked_or_safepoint(CodeCache_lock); | |
| 357 print_trace("drop_scavenge_root", nm); | |
| 358 nmethod* last = NULL; | |
| 359 nmethod* cur = scavenge_root_nmethods(); | |
| 360 while (cur != NULL) { | |
| 361 nmethod* next = cur->scavenge_root_link(); | |
| 362 if (cur == nm) { | |
| 363 if (last != NULL) | |
| 364 last->set_scavenge_root_link(next); | |
| 365 else set_scavenge_root_nmethods(next); | |
| 366 nm->set_scavenge_root_link(NULL); | |
| 367 nm->clear_on_scavenge_root_list(); | |
| 368 return; | |
| 369 } | |
| 370 last = cur; | |
| 371 cur = next; | |
| 372 } | |
| 373 assert(false, "should have been on list"); | |
| 374 } | |
| 375 | |
| 376 void CodeCache::prune_scavenge_root_nmethods() { | |
| 377 assert_locked_or_safepoint(CodeCache_lock); | |
| 378 debug_only(mark_scavenge_root_nmethods()); | |
| 379 | |
| 380 nmethod* last = NULL; | |
| 381 nmethod* cur = scavenge_root_nmethods(); | |
| 382 while (cur != NULL) { | |
| 383 nmethod* next = cur->scavenge_root_link(); | |
| 384 debug_only(cur->clear_scavenge_root_marked()); | |
| 385 assert(cur->scavenge_root_not_marked(), ""); | |
| 386 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 387 | |
| 388 if (!cur->is_zombie() && !cur->is_unloaded() | |
| 389 && cur->detect_scavenge_root_oops()) { | |
| 390 // Keep it. Advance 'last' to prevent deletion. | |
| 391 last = cur; | |
| 392 } else { | |
| 393 // Prune it from the list, so we don't have to look at it any more. | |
| 394 print_trace("prune_scavenge_root", cur); | |
| 395 cur->set_scavenge_root_link(NULL); | |
| 396 cur->clear_on_scavenge_root_list(); | |
| 397 if (last != NULL) | |
| 398 last->set_scavenge_root_link(next); | |
| 399 else set_scavenge_root_nmethods(next); | |
| 400 } | |
| 401 cur = next; | |
| 402 } | |
| 403 | |
| 404 // Check for stray marks. | |
| 405 debug_only(verify_perm_nmethods(NULL)); | |
| 406 } | |
| 407 | |
| 408 #ifndef PRODUCT | |
| 409 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) { | |
| 410 // While we are here, verify the integrity of the list. | |
| 411 mark_scavenge_root_nmethods(); | |
| 412 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { | |
| 413 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); | |
| 414 cur->clear_scavenge_root_marked(); | |
| 415 } | |
| 416 verify_perm_nmethods(f); | |
| 417 } | |
| 418 | |
| 419 // Temporarily mark nmethods that are claimed to be on the non-perm list. | |
| 420 void CodeCache::mark_scavenge_root_nmethods() { | |
| 421 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 422 if (cb->is_nmethod()) { | |
| 423 nmethod *nm = (nmethod*)cb; | |
| 424 assert(nm->scavenge_root_not_marked(), "clean state"); | |
| 425 if (nm->on_scavenge_root_list()) | |
| 426 nm->set_scavenge_root_marked(); | |
| 427 } | |
| 428 } | |
| 429 } | |
| 430 | |
| 431 // If the closure is given, run it on the unlisted nmethods. | |
| 432 // Also make sure that the effects of mark_scavenge_root_nmethods is gone. | |
| 433 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) { | |
| 434 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 435 bool call_f = (f_or_null != NULL); | |
| 436 if (cb->is_nmethod()) { | |
| 437 nmethod *nm = (nmethod*)cb; | |
| 438 assert(nm->scavenge_root_not_marked(), "must be already processed"); | |
| 439 if (nm->on_scavenge_root_list()) | |
| 440 call_f = false; // don't show this one to the client | |
| 441 nm->verify_scavenge_root_oops(); | |
| 442 } else { | |
| 443 call_f = false; // not an nmethod | |
| 444 } | |
| 445 if (call_f) f_or_null->do_code_blob(cb); | |
| 446 } | |
| 447 } | |
| 448 #endif //PRODUCT | |
| 449 | |
| 1202 | 450 |
| 451 nmethod* CodeCache::find_and_remove_saved_code(methodOop m) { | |
| 452 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 453 nmethod* saved = _saved_nmethods; | |
| 454 nmethod* prev = NULL; | |
| 455 while (saved != NULL) { | |
| 456 if (saved->is_in_use() && saved->method() == m) { | |
| 457 if (prev != NULL) { | |
| 458 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
| 459 } else { | |
| 460 _saved_nmethods = saved->saved_nmethod_link(); | |
| 461 } | |
| 462 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods"); | |
| 463 saved->set_speculatively_disconnected(false); | |
| 464 saved->set_saved_nmethod_link(NULL); | |
| 465 if (PrintMethodFlushing) { | |
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466 saved->print_on(tty, " ### nmethod is reconnected\n"); |
| 1202 | 467 } |
| 468 if (LogCompilation && (xtty != NULL)) { | |
| 469 ttyLocker ttyl; | |
| 470 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id()); | |
| 471 xtty->method(methodOop(m)); | |
| 472 xtty->stamp(); | |
| 473 xtty->end_elem(); | |
| 474 } | |
| 475 return saved; | |
| 476 } | |
| 477 prev = saved; | |
| 478 saved = saved->saved_nmethod_link(); | |
| 479 } | |
| 480 return NULL; | |
| 481 } | |
| 482 | |
| 483 void CodeCache::remove_saved_code(nmethod* nm) { | |
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484 // For conc swpr this will be called with CodeCache_lock taken by caller |
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485 assert_locked_or_safepoint(CodeCache_lock); |
| 1202 | 486 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods"); |
| 487 nmethod* saved = _saved_nmethods; | |
| 488 nmethod* prev = NULL; | |
| 489 while (saved != NULL) { | |
| 490 if (saved == nm) { | |
| 491 if (prev != NULL) { | |
| 492 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); | |
| 493 } else { | |
| 494 _saved_nmethods = saved->saved_nmethod_link(); | |
| 495 } | |
| 496 if (LogCompilation && (xtty != NULL)) { | |
| 497 ttyLocker ttyl; | |
| 498 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id()); | |
| 499 xtty->stamp(); | |
| 500 xtty->end_elem(); | |
| 501 } | |
| 502 return; | |
| 503 } | |
| 504 prev = saved; | |
| 505 saved = saved->saved_nmethod_link(); | |
| 506 } | |
| 507 ShouldNotReachHere(); | |
| 508 } | |
| 509 | |
| 510 void CodeCache::speculatively_disconnect(nmethod* nm) { | |
| 511 assert_locked_or_safepoint(CodeCache_lock); | |
| 512 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods"); | |
| 513 nm->set_saved_nmethod_link(_saved_nmethods); | |
| 514 _saved_nmethods = nm; | |
| 515 if (PrintMethodFlushing) { | |
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516 nm->print_on(tty, " ### nmethod is speculatively disconnected\n"); |
| 1202 | 517 } |
| 518 if (LogCompilation && (xtty != NULL)) { | |
| 519 ttyLocker ttyl; | |
| 520 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id()); | |
| 521 xtty->method(methodOop(nm->method())); | |
| 522 xtty->stamp(); | |
| 523 xtty->end_elem(); | |
| 524 } | |
| 525 nm->method()->clear_code(); | |
| 526 nm->set_speculatively_disconnected(true); | |
| 527 } | |
| 528 | |
| 529 | |
| 0 | 530 void CodeCache::gc_prologue() { |
| 989 | 531 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called"); |
| 0 | 532 } |
| 533 | |
| 534 | |
| 535 void CodeCache::gc_epilogue() { | |
| 536 assert_locked_or_safepoint(CodeCache_lock); | |
| 537 FOR_ALL_ALIVE_BLOBS(cb) { | |
| 538 if (cb->is_nmethod()) { | |
| 539 nmethod *nm = (nmethod*)cb; | |
| 540 assert(!nm->is_unloaded(), "Tautology"); | |
| 541 if (needs_cache_clean()) { | |
| 542 nm->cleanup_inline_caches(); | |
| 543 } | |
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544 DEBUG_ONLY(nm->verify()); |
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545 nm->fix_oop_relocations(); |
| 0 | 546 } |
| 547 } | |
| 548 set_needs_cache_clean(false); | |
| 989 | 549 prune_scavenge_root_nmethods(); |
| 550 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); | |
| 0 | 551 } |
| 552 | |
| 553 | |
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554 void CodeCache::verify_oops() { |
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555 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); |
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556 VerifyOopClosure voc; |
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557 FOR_ALL_ALIVE_BLOBS(cb) { |
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558 if (cb->is_nmethod()) { |
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559 nmethod *nm = (nmethod*)cb; |
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560 nm->oops_do(&voc); |
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561 nm->verify_oop_relocations(); |
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562 } |
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563 } |
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564 } |
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565 |
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566 |
| 0 | 567 address CodeCache::first_address() { |
| 568 assert_locked_or_safepoint(CodeCache_lock); | |
| 569 return (address)_heap->begin(); | |
| 570 } | |
| 571 | |
| 572 | |
| 573 address CodeCache::last_address() { | |
| 574 assert_locked_or_safepoint(CodeCache_lock); | |
| 575 return (address)_heap->end(); | |
| 576 } | |
| 577 | |
| 578 | |
| 579 void icache_init(); | |
| 580 | |
| 581 void CodeCache::initialize() { | |
| 582 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points"); | |
| 583 #ifdef COMPILER2 | |
| 584 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops"); | |
| 585 #endif | |
| 586 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants"); | |
| 587 // This was originally just a check of the alignment, causing failure, instead, round | |
| 588 // the code cache to the page size. In particular, Solaris is moving to a larger | |
| 589 // default page size. | |
| 590 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size()); | |
| 591 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size()); | |
| 592 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size()); | |
| 593 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) { | |
| 594 vm_exit_during_initialization("Could not reserve enough space for code cache"); | |
| 595 } | |
| 596 | |
| 597 MemoryService::add_code_heap_memory_pool(_heap); | |
| 598 | |
| 599 // Initialize ICache flush mechanism | |
| 600 // This service is needed for os::register_code_area | |
| 601 icache_init(); | |
| 602 | |
| 603 // Give OS a chance to register generated code area. | |
| 604 // This is used on Windows 64 bit platforms to register | |
| 605 // Structured Exception Handlers for our generated code. | |
| 606 os::register_code_area(_heap->low_boundary(), _heap->high_boundary()); | |
| 607 } | |
| 608 | |
| 609 | |
| 610 void codeCache_init() { | |
| 611 CodeCache::initialize(); | |
| 612 } | |
| 613 | |
| 614 //------------------------------------------------------------------------------------------------ | |
| 615 | |
| 616 int CodeCache::number_of_nmethods_with_dependencies() { | |
| 617 return _number_of_nmethods_with_dependencies; | |
| 618 } | |
| 619 | |
| 620 void CodeCache::clear_inline_caches() { | |
| 621 assert_locked_or_safepoint(CodeCache_lock); | |
| 622 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 623 nm->clear_inline_caches(); | |
| 624 } | |
| 625 } | |
| 626 | |
| 627 #ifndef PRODUCT | |
| 628 // used to keep track of how much time is spent in mark_for_deoptimization | |
| 629 static elapsedTimer dependentCheckTime; | |
| 630 static int dependentCheckCount = 0; | |
| 631 #endif // PRODUCT | |
| 632 | |
| 633 | |
| 634 int CodeCache::mark_for_deoptimization(DepChange& changes) { | |
| 635 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 636 | |
| 637 #ifndef PRODUCT | |
| 638 dependentCheckTime.start(); | |
| 639 dependentCheckCount++; | |
| 640 #endif // PRODUCT | |
| 641 | |
| 642 int number_of_marked_CodeBlobs = 0; | |
| 643 | |
| 644 // search the hierarchy looking for nmethods which are affected by the loading of this class | |
| 645 | |
| 646 // then search the interfaces this class implements looking for nmethods | |
| 647 // which might be dependent of the fact that an interface only had one | |
| 648 // implementor. | |
| 649 | |
| 650 { No_Safepoint_Verifier nsv; | |
| 651 for (DepChange::ContextStream str(changes, nsv); str.next(); ) { | |
| 652 klassOop d = str.klass(); | |
| 653 number_of_marked_CodeBlobs += instanceKlass::cast(d)->mark_dependent_nmethods(changes); | |
| 654 } | |
| 655 } | |
| 656 | |
| 657 if (VerifyDependencies) { | |
| 658 // Turn off dependency tracing while actually testing deps. | |
| 659 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); | |
| 660 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 661 if (!nm->is_marked_for_deoptimization() && | |
| 662 nm->check_all_dependencies()) { | |
| 663 ResourceMark rm; | |
| 664 tty->print_cr("Should have been marked for deoptimization:"); | |
| 665 changes.print(); | |
| 666 nm->print(); | |
| 667 nm->print_dependencies(); | |
| 668 } | |
| 669 } | |
| 670 } | |
| 671 | |
| 672 #ifndef PRODUCT | |
| 673 dependentCheckTime.stop(); | |
| 674 #endif // PRODUCT | |
| 675 | |
| 676 return number_of_marked_CodeBlobs; | |
| 677 } | |
| 678 | |
| 679 | |
| 680 #ifdef HOTSWAP | |
| 681 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) { | |
| 682 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 683 int number_of_marked_CodeBlobs = 0; | |
| 684 | |
| 685 // Deoptimize all methods of the evolving class itself | |
| 686 objArrayOop old_methods = dependee->methods(); | |
| 687 for (int i = 0; i < old_methods->length(); i++) { | |
| 688 ResourceMark rm; | |
| 689 methodOop old_method = (methodOop) old_methods->obj_at(i); | |
| 690 nmethod *nm = old_method->code(); | |
| 691 if (nm != NULL) { | |
| 692 nm->mark_for_deoptimization(); | |
| 693 number_of_marked_CodeBlobs++; | |
| 694 } | |
| 695 } | |
| 696 | |
| 697 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 698 if (nm->is_marked_for_deoptimization()) { | |
| 699 // ...Already marked in the previous pass; don't count it again. | |
| 700 } else if (nm->is_evol_dependent_on(dependee())) { | |
| 701 ResourceMark rm; | |
| 702 nm->mark_for_deoptimization(); | |
| 703 number_of_marked_CodeBlobs++; | |
| 704 } else { | |
| 705 // flush caches in case they refer to a redefined methodOop | |
| 706 nm->clear_inline_caches(); | |
| 707 } | |
| 708 } | |
| 709 | |
| 710 return number_of_marked_CodeBlobs; | |
| 711 } | |
| 712 #endif // HOTSWAP | |
| 713 | |
| 714 | |
| 715 // Deoptimize all methods | |
| 716 void CodeCache::mark_all_nmethods_for_deoptimization() { | |
| 717 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 718 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 719 nm->mark_for_deoptimization(); | |
| 720 } | |
| 721 } | |
| 722 | |
| 723 | |
| 724 int CodeCache::mark_for_deoptimization(methodOop dependee) { | |
| 725 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
| 726 int number_of_marked_CodeBlobs = 0; | |
| 727 | |
| 728 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 729 if (nm->is_dependent_on_method(dependee)) { | |
| 730 ResourceMark rm; | |
| 731 nm->mark_for_deoptimization(); | |
| 732 number_of_marked_CodeBlobs++; | |
| 733 } | |
| 734 } | |
| 735 | |
| 736 return number_of_marked_CodeBlobs; | |
| 737 } | |
| 738 | |
| 739 void CodeCache::make_marked_nmethods_zombies() { | |
| 740 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 741 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 742 if (nm->is_marked_for_deoptimization()) { | |
| 743 | |
| 744 // If the nmethod has already been made non-entrant and it can be converted | |
| 745 // then zombie it now. Otherwise make it non-entrant and it will eventually | |
| 746 // be zombied when it is no longer seen on the stack. Note that the nmethod | |
| 747 // might be "entrant" and not on the stack and so could be zombied immediately | |
| 748 // but we can't tell because we don't track it on stack until it becomes | |
| 749 // non-entrant. | |
| 750 | |
| 751 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) { | |
| 752 nm->make_zombie(); | |
| 753 } else { | |
| 754 nm->make_not_entrant(); | |
| 755 } | |
| 756 } | |
| 757 } | |
| 758 } | |
| 759 | |
| 760 void CodeCache::make_marked_nmethods_not_entrant() { | |
| 761 assert_locked_or_safepoint(CodeCache_lock); | |
| 762 FOR_ALL_ALIVE_NMETHODS(nm) { | |
| 763 if (nm->is_marked_for_deoptimization()) { | |
| 764 nm->make_not_entrant(); | |
| 765 } | |
| 766 } | |
| 767 } | |
| 768 | |
| 769 void CodeCache::verify() { | |
| 770 _heap->verify(); | |
| 771 FOR_ALL_ALIVE_BLOBS(p) { | |
| 772 p->verify(); | |
| 773 } | |
| 774 } | |
| 775 | |
| 776 //------------------------------------------------------------------------------------------------ | |
| 777 // Non-product version | |
| 778 | |
| 779 #ifndef PRODUCT | |
| 780 | |
| 781 void CodeCache::verify_if_often() { | |
| 782 if (VerifyCodeCacheOften) { | |
| 783 _heap->verify(); | |
| 784 } | |
| 785 } | |
| 786 | |
| 989 | 787 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) { |
| 788 if (PrintCodeCache2) { // Need to add a new flag | |
| 789 ResourceMark rm; | |
| 790 if (size == 0) size = cb->size(); | |
| 791 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size); | |
| 792 } | |
| 793 } | |
| 794 | |
| 0 | 795 void CodeCache::print_internals() { |
| 796 int nmethodCount = 0; | |
| 797 int runtimeStubCount = 0; | |
| 798 int adapterCount = 0; | |
| 799 int deoptimizationStubCount = 0; | |
| 800 int uncommonTrapStubCount = 0; | |
| 801 int bufferBlobCount = 0; | |
| 802 int total = 0; | |
| 803 int nmethodAlive = 0; | |
| 804 int nmethodNotEntrant = 0; | |
| 805 int nmethodZombie = 0; | |
| 806 int nmethodUnloaded = 0; | |
| 807 int nmethodJava = 0; | |
| 808 int nmethodNative = 0; | |
| 809 int maxCodeSize = 0; | |
| 810 ResourceMark rm; | |
| 811 | |
| 812 CodeBlob *cb; | |
| 813 for (cb = first(); cb != NULL; cb = next(cb)) { | |
| 814 total++; | |
| 815 if (cb->is_nmethod()) { | |
| 816 nmethod* nm = (nmethod*)cb; | |
| 817 | |
| 818 if (Verbose && nm->method() != NULL) { | |
| 819 ResourceMark rm; | |
| 820 char *method_name = nm->method()->name_and_sig_as_C_string(); | |
| 821 tty->print("%s", method_name); | |
| 822 if(nm->is_alive()) { tty->print_cr(" alive"); } | |
| 823 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); } | |
| 824 if(nm->is_zombie()) { tty->print_cr(" zombie"); } | |
| 825 } | |
| 826 | |
| 827 nmethodCount++; | |
| 828 | |
| 829 if(nm->is_alive()) { nmethodAlive++; } | |
| 830 if(nm->is_not_entrant()) { nmethodNotEntrant++; } | |
| 831 if(nm->is_zombie()) { nmethodZombie++; } | |
| 832 if(nm->is_unloaded()) { nmethodUnloaded++; } | |
| 833 if(nm->is_native_method()) { nmethodNative++; } | |
| 834 | |
| 835 if(nm->method() != NULL && nm->is_java_method()) { | |
| 836 nmethodJava++; | |
| 1748 | 837 if (nm->insts_size() > maxCodeSize) { |
| 838 maxCodeSize = nm->insts_size(); | |
| 0 | 839 } |
| 840 } | |
| 841 } else if (cb->is_runtime_stub()) { | |
| 842 runtimeStubCount++; | |
| 843 } else if (cb->is_deoptimization_stub()) { | |
| 844 deoptimizationStubCount++; | |
| 845 } else if (cb->is_uncommon_trap_stub()) { | |
| 846 uncommonTrapStubCount++; | |
| 847 } else if (cb->is_adapter_blob()) { | |
| 848 adapterCount++; | |
| 849 } else if (cb->is_buffer_blob()) { | |
| 850 bufferBlobCount++; | |
| 851 } | |
| 852 } | |
| 853 | |
| 854 int bucketSize = 512; | |
| 855 int bucketLimit = maxCodeSize / bucketSize + 1; | |
| 856 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit); | |
| 857 memset(buckets,0,sizeof(int) * bucketLimit); | |
| 858 | |
| 859 for (cb = first(); cb != NULL; cb = next(cb)) { | |
| 860 if (cb->is_nmethod()) { | |
| 861 nmethod* nm = (nmethod*)cb; | |
| 862 if(nm->is_java_method()) { | |
| 1748 | 863 buckets[nm->insts_size() / bucketSize]++; |
| 0 | 864 } |
| 865 } | |
| 866 } | |
| 867 tty->print_cr("Code Cache Entries (total of %d)",total); | |
| 868 tty->print_cr("-------------------------------------------------"); | |
| 869 tty->print_cr("nmethods: %d",nmethodCount); | |
| 870 tty->print_cr("\talive: %d",nmethodAlive); | |
| 871 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant); | |
| 872 tty->print_cr("\tzombie: %d",nmethodZombie); | |
| 873 tty->print_cr("\tunloaded: %d",nmethodUnloaded); | |
| 874 tty->print_cr("\tjava: %d",nmethodJava); | |
| 875 tty->print_cr("\tnative: %d",nmethodNative); | |
| 876 tty->print_cr("runtime_stubs: %d",runtimeStubCount); | |
| 877 tty->print_cr("adapters: %d",adapterCount); | |
| 878 tty->print_cr("buffer blobs: %d",bufferBlobCount); | |
| 879 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount); | |
| 880 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount); | |
| 881 tty->print_cr("\nnmethod size distribution (non-zombie java)"); | |
| 882 tty->print_cr("-------------------------------------------------"); | |
| 883 | |
| 884 for(int i=0; i<bucketLimit; i++) { | |
| 885 if(buckets[i] != 0) { | |
| 886 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize); | |
| 887 tty->fill_to(40); | |
| 888 tty->print_cr("%d",buckets[i]); | |
| 889 } | |
| 890 } | |
| 891 | |
| 892 FREE_C_HEAP_ARRAY(int, buckets); | |
| 893 } | |
| 894 | |
| 895 void CodeCache::print() { | |
| 896 CodeBlob_sizes live; | |
| 897 CodeBlob_sizes dead; | |
| 898 | |
| 899 FOR_ALL_BLOBS(p) { | |
| 900 if (!p->is_alive()) { | |
| 901 dead.add(p); | |
| 902 } else { | |
| 903 live.add(p); | |
| 904 } | |
| 905 } | |
| 906 | |
| 907 tty->print_cr("CodeCache:"); | |
| 908 | |
| 909 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(), | |
| 910 dependentCheckTime.seconds() / dependentCheckCount); | |
| 911 | |
| 912 if (!live.is_empty()) { | |
| 913 live.print("live"); | |
| 914 } | |
| 915 if (!dead.is_empty()) { | |
| 916 dead.print("dead"); | |
| 917 } | |
| 918 | |
| 919 | |
| 920 if (Verbose) { | |
| 921 // print the oop_map usage | |
| 922 int code_size = 0; | |
| 923 int number_of_blobs = 0; | |
| 924 int number_of_oop_maps = 0; | |
| 925 int map_size = 0; | |
| 926 FOR_ALL_BLOBS(p) { | |
| 927 if (p->is_alive()) { | |
| 928 number_of_blobs++; | |
| 1748 | 929 code_size += p->code_size(); |
| 0 | 930 OopMapSet* set = p->oop_maps(); |
| 931 if (set != NULL) { | |
| 932 number_of_oop_maps += set->size(); | |
| 1748 | 933 map_size += set->heap_size(); |
| 0 | 934 } |
| 935 } | |
| 936 } | |
| 937 tty->print_cr("OopMaps"); | |
| 938 tty->print_cr(" #blobs = %d", number_of_blobs); | |
| 939 tty->print_cr(" code size = %d", code_size); | |
| 940 tty->print_cr(" #oop_maps = %d", number_of_oop_maps); | |
| 941 tty->print_cr(" map size = %d", map_size); | |
| 942 } | |
| 943 | |
| 944 } | |
| 945 | |
| 946 #endif // PRODUCT | |
| 1907 | 947 |
| 948 void CodeCache::print_bounds(outputStream* st) { | |
| 949 st->print_cr("Code Cache [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT ")", | |
| 950 _heap->low_boundary(), | |
| 951 _heap->high(), | |
| 952 _heap->high_boundary()); | |
| 953 st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT | |
|
2353
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changeset
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954 " adapters=" UINT32_FORMAT " free_code_cache=" SIZE_FORMAT "Kb" |
|
2091
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955 " largest_free_block=" SIZE_FORMAT, |
|
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956 nof_blobs(), nof_nmethods(), nof_adapters(), |
|
1c0cf339481b
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957 unallocated_capacity()/K, largest_free_block()); |
| 1907 | 958 } |
|
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959 |
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960 void CodeCache::log_state(outputStream* st) { |
|
1c0cf339481b
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changeset
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961 st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'" |
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1c0cf339481b
7025742: Can not use CodeCache::unallocated_capacity() with fragmented CodeCache
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diff
changeset
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962 " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'" |
|
1c0cf339481b
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diff
changeset
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963 " largest_free_block='" SIZE_FORMAT "'", |
|
1c0cf339481b
7025742: Can not use CodeCache::unallocated_capacity() with fragmented CodeCache
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diff
changeset
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964 nof_blobs(), nof_nmethods(), nof_adapters(), |
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1c0cf339481b
7025742: Can not use CodeCache::unallocated_capacity() with fragmented CodeCache
kvn
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diff
changeset
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965 unallocated_capacity(), largest_free_block()); |
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1c0cf339481b
7025742: Can not use CodeCache::unallocated_capacity() with fragmented CodeCache
kvn
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diff
changeset
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966 } |