1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/codeBlob.hpp" 27 #include "code/codeCache.hpp" 28 #include "code/compiledIC.hpp" 29 #include "code/dependencies.hpp" 30 #include "code/icBuffer.hpp" 31 #include "code/nmethod.hpp" 32 #include "code/pcDesc.hpp" 33 #include "compiler/compileBroker.hpp" 34 #include "gc_implementation/shared/markSweep.hpp" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/gcLocker.hpp" 37 #include "memory/iterator.hpp" 38 #include "memory/resourceArea.hpp" 39 #include "oops/method.hpp" 40 #include "oops/objArrayOop.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "runtime/handles.inline.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/icache.hpp" 45 #include "runtime/java.hpp" 46 #include "runtime/mutexLocker.hpp" 47 #include "services/memoryService.hpp" 48 #include "trace/tracing.hpp" 49 #include "utilities/xmlstream.hpp" 50 51 // Helper class for printing in CodeCache 52 53 class CodeBlob_sizes { 54 private: 55 int count; 56 int total_size; 57 int header_size; 58 int code_size; 59 int stub_size; 60 int relocation_size; 61 int scopes_oop_size; 62 int scopes_metadata_size; 63 int scopes_data_size; 64 int scopes_pcs_size; 65 66 public: 67 CodeBlob_sizes() { 68 count = 0; 69 total_size = 0; 70 header_size = 0; 71 code_size = 0; 72 stub_size = 0; 73 relocation_size = 0; 74 scopes_oop_size = 0; 75 scopes_metadata_size = 0; 76 scopes_data_size = 0; 77 scopes_pcs_size = 0; 78 } 79 80 int total() { return total_size; } 81 bool is_empty() { return count == 0; } 82 83 void print(const char* title) { 84 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])", 85 count, 86 title, 87 total() / K, 88 header_size * 100 / total_size, 89 relocation_size * 100 / total_size, 90 code_size * 100 / total_size, 91 stub_size * 100 / total_size, 92 scopes_oop_size * 100 / total_size, 93 scopes_metadata_size * 100 / total_size, 94 scopes_data_size * 100 / total_size, 95 scopes_pcs_size * 100 / total_size); 96 } 97 98 void add(CodeBlob* cb) { 99 count++; 100 total_size += cb->size(); 101 header_size += cb->header_size(); 102 relocation_size += cb->relocation_size(); 103 if (cb->is_nmethod()) { 104 nmethod* nm = cb->as_nmethod_or_null(); 105 code_size += nm->insts_size(); 106 stub_size += nm->stub_size(); 107 108 scopes_oop_size += nm->oops_size(); 109 scopes_metadata_size += nm->metadata_size(); 110 scopes_data_size += nm->scopes_data_size(); 111 scopes_pcs_size += nm->scopes_pcs_size(); 112 } else { 113 code_size += cb->code_size(); 114 } 115 } 116 }; 117 118 // CodeCache implementation 119 120 CodeHeap * CodeCache::_heap = new CodeHeap(); 121 int CodeCache::_number_of_blobs = 0; 122 int CodeCache::_number_of_adapters = 0; 123 int CodeCache::_number_of_nmethods = 0; 124 int CodeCache::_number_of_nmethods_with_dependencies = 0; 125 bool CodeCache::_needs_cache_clean = false; 126 nmethod* CodeCache::_scavenge_root_nmethods = NULL; 127 128 int CodeCache::_codemem_full_count = 0; 129 130 CodeBlob* CodeCache::first() { 131 assert_locked_or_safepoint(CodeCache_lock); 132 return (CodeBlob*)_heap->first(); 133 } 134 135 136 CodeBlob* CodeCache::next(CodeBlob* cb) { 137 assert_locked_or_safepoint(CodeCache_lock); 138 return (CodeBlob*)_heap->next(cb); 139 } 140 141 142 CodeBlob* CodeCache::alive(CodeBlob *cb) { 143 assert_locked_or_safepoint(CodeCache_lock); 144 while (cb != NULL && !cb->is_alive()) cb = next(cb); 145 return cb; 146 } 147 148 149 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) { 150 assert_locked_or_safepoint(CodeCache_lock); 151 while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb); 152 return (nmethod*)cb; 153 } 154 155 nmethod* CodeCache::first_nmethod() { 156 assert_locked_or_safepoint(CodeCache_lock); 157 CodeBlob* cb = first(); 158 while (cb != NULL && !cb->is_nmethod()) { 159 cb = next(cb); 160 } 161 return (nmethod*)cb; 162 } 163 164 nmethod* CodeCache::next_nmethod (CodeBlob* cb) { 165 assert_locked_or_safepoint(CodeCache_lock); 166 cb = next(cb); 167 while (cb != NULL && !cb->is_nmethod()) { 168 cb = next(cb); 169 } 170 return (nmethod*)cb; 171 } 172 173 static size_t maxCodeCacheUsed = 0; 174 175 CodeBlob* CodeCache::allocate(int size, bool is_critical) { 176 // Do not seize the CodeCache lock here--if the caller has not 177 // already done so, we are going to lose bigtime, since the code 178 // cache will contain a garbage CodeBlob until the caller can 179 // run the constructor for the CodeBlob subclass he is busy 180 // instantiating. 181 guarantee(size >= 0, "allocation request must be reasonable"); 182 assert_locked_or_safepoint(CodeCache_lock); 183 CodeBlob* cb = NULL; 184 _number_of_blobs++; 185 while (true) { 186 cb = (CodeBlob*)_heap->allocate(size, is_critical); 187 if (cb != NULL) break; 188 if (!_heap->expand_by(CodeCacheExpansionSize)) { 189 // Expansion failed 190 return NULL; 191 } 192 if (PrintCodeCacheExtension) { 193 ResourceMark rm; 194 tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)", 195 (intptr_t)_heap->low_boundary(), (intptr_t)_heap->high(), 196 (address)_heap->high() - (address)_heap->low_boundary()); 197 } 198 } 199 maxCodeCacheUsed = MAX2(maxCodeCacheUsed, ((address)_heap->high_boundary() - 200 (address)_heap->low_boundary()) - unallocated_capacity()); 201 verify_if_often(); 202 print_trace("allocation", cb, size); 203 return cb; 204 } 205 206 void CodeCache::free(CodeBlob* cb) { 207 assert_locked_or_safepoint(CodeCache_lock); 208 verify_if_often(); 209 210 print_trace("free", cb); 211 if (cb->is_nmethod()) { 212 _number_of_nmethods--; 213 if (((nmethod *)cb)->has_dependencies()) { 214 _number_of_nmethods_with_dependencies--; 215 } 216 } 217 if (cb->is_adapter_blob()) { 218 _number_of_adapters--; 219 } 220 _number_of_blobs--; 221 222 _heap->deallocate(cb); 223 224 verify_if_often(); 225 assert(_number_of_blobs >= 0, "sanity check"); 226 } 227 228 229 void CodeCache::commit(CodeBlob* cb) { 230 // this is called by nmethod::nmethod, which must already own CodeCache_lock 231 assert_locked_or_safepoint(CodeCache_lock); 232 if (cb->is_nmethod()) { 233 _number_of_nmethods++; 234 if (((nmethod *)cb)->has_dependencies()) { 235 _number_of_nmethods_with_dependencies++; 236 } 237 } 238 if (cb->is_adapter_blob()) { 239 _number_of_adapters++; 240 } 241 242 // flush the hardware I-cache 243 ICache::invalidate_range(cb->content_begin(), cb->content_size()); 244 } 245 246 247 void CodeCache::flush() { 248 assert_locked_or_safepoint(CodeCache_lock); 249 Unimplemented(); 250 } 251 252 253 // Iteration over CodeBlobs 254 255 #define FOR_ALL_BLOBS(var) for (CodeBlob *var = first() ; var != NULL; var = next(var) ) 256 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var))) 257 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var))) 258 259 260 bool CodeCache::contains(void *p) { 261 // It should be ok to call contains without holding a lock 262 return _heap->contains(p); 263 } 264 265 266 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not 267 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain 268 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled. 269 CodeBlob* CodeCache::find_blob(void* start) { 270 CodeBlob* result = find_blob_unsafe(start); 271 if (result == NULL) return NULL; 272 // We could potientially look up non_entrant methods 273 guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method"); 274 return result; 275 } 276 277 nmethod* CodeCache::find_nmethod(void* start) { 278 CodeBlob *cb = find_blob(start); 279 assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod"); 280 return (nmethod*)cb; 281 } 282 283 284 void CodeCache::blobs_do(void f(CodeBlob* nm)) { 285 assert_locked_or_safepoint(CodeCache_lock); 286 FOR_ALL_BLOBS(p) { 287 f(p); 288 } 289 } 290 291 292 void CodeCache::nmethods_do(void f(nmethod* nm)) { 293 assert_locked_or_safepoint(CodeCache_lock); 294 FOR_ALL_BLOBS(nm) { 295 if (nm->is_nmethod()) f((nmethod*)nm); 296 } 297 } 298 299 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) { 300 assert_locked_or_safepoint(CodeCache_lock); 301 FOR_ALL_ALIVE_NMETHODS(nm) { 302 f(nm); 303 } 304 } 305 306 int CodeCache::alignment_unit() { 307 return (int)_heap->alignment_unit(); 308 } 309 310 311 int CodeCache::alignment_offset() { 312 return (int)_heap->alignment_offset(); 313 } 314 315 316 // Mark nmethods for unloading if they contain otherwise unreachable 317 // oops. 318 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 319 assert_locked_or_safepoint(CodeCache_lock); 320 FOR_ALL_ALIVE_NMETHODS(nm) { 321 nm->do_unloading(is_alive, unloading_occurred); 322 } 323 } 324 325 void CodeCache::blobs_do(CodeBlobClosure* f) { 326 assert_locked_or_safepoint(CodeCache_lock); 327 FOR_ALL_ALIVE_BLOBS(cb) { 328 f->do_code_blob(cb); 329 330 #ifdef ASSERT 331 if (cb->is_nmethod()) 332 ((nmethod*)cb)->verify_scavenge_root_oops(); 333 #endif //ASSERT 334 } 335 } 336 337 // Walk the list of methods which might contain non-perm oops. 338 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) { 339 assert_locked_or_safepoint(CodeCache_lock); 340 debug_only(mark_scavenge_root_nmethods()); 341 342 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { 343 debug_only(cur->clear_scavenge_root_marked()); 344 assert(cur->scavenge_root_not_marked(), ""); 345 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); 346 347 bool is_live = (!cur->is_zombie() && !cur->is_unloaded()); 348 #ifndef PRODUCT 349 if (TraceScavenge) { 350 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr(); 351 } 352 #endif //PRODUCT 353 if (is_live) { 354 // Perform cur->oops_do(f), maybe just once per nmethod. 355 f->do_code_blob(cur); 356 } 357 } 358 359 // Check for stray marks. 360 debug_only(verify_perm_nmethods(NULL)); 361 } 362 363 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) { 364 assert_locked_or_safepoint(CodeCache_lock); 365 nm->set_on_scavenge_root_list(); 366 nm->set_scavenge_root_link(_scavenge_root_nmethods); 367 set_scavenge_root_nmethods(nm); 368 print_trace("add_scavenge_root", nm); 369 } 370 371 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) { 372 assert_locked_or_safepoint(CodeCache_lock); 373 print_trace("drop_scavenge_root", nm); 374 nmethod* last = NULL; 375 nmethod* cur = scavenge_root_nmethods(); 376 while (cur != NULL) { 377 nmethod* next = cur->scavenge_root_link(); 378 if (cur == nm) { 379 if (last != NULL) 380 last->set_scavenge_root_link(next); 381 else set_scavenge_root_nmethods(next); 382 nm->set_scavenge_root_link(NULL); 383 nm->clear_on_scavenge_root_list(); 384 return; 385 } 386 last = cur; 387 cur = next; 388 } 389 assert(false, "should have been on list"); 390 } 391 392 void CodeCache::prune_scavenge_root_nmethods() { 393 assert_locked_or_safepoint(CodeCache_lock); 394 debug_only(mark_scavenge_root_nmethods()); 395 396 nmethod* last = NULL; 397 nmethod* cur = scavenge_root_nmethods(); 398 while (cur != NULL) { 399 nmethod* next = cur->scavenge_root_link(); 400 debug_only(cur->clear_scavenge_root_marked()); 401 assert(cur->scavenge_root_not_marked(), ""); 402 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); 403 404 if (!cur->is_zombie() && !cur->is_unloaded() 405 && cur->detect_scavenge_root_oops()) { 406 // Keep it. Advance 'last' to prevent deletion. 407 last = cur; 408 } else { 409 // Prune it from the list, so we don't have to look at it any more. 410 print_trace("prune_scavenge_root", cur); 411 cur->set_scavenge_root_link(NULL); 412 cur->clear_on_scavenge_root_list(); 413 if (last != NULL) 414 last->set_scavenge_root_link(next); 415 else set_scavenge_root_nmethods(next); 416 } 417 cur = next; 418 } 419 420 // Check for stray marks. 421 debug_only(verify_perm_nmethods(NULL)); 422 } 423 424 #ifndef PRODUCT 425 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) { 426 // While we are here, verify the integrity of the list. 427 mark_scavenge_root_nmethods(); 428 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) { 429 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list"); 430 cur->clear_scavenge_root_marked(); 431 } 432 verify_perm_nmethods(f); 433 } 434 435 // Temporarily mark nmethods that are claimed to be on the non-perm list. 436 void CodeCache::mark_scavenge_root_nmethods() { 437 FOR_ALL_ALIVE_BLOBS(cb) { 438 if (cb->is_nmethod()) { 439 nmethod *nm = (nmethod*)cb; 440 assert(nm->scavenge_root_not_marked(), "clean state"); 441 if (nm->on_scavenge_root_list()) 442 nm->set_scavenge_root_marked(); 443 } 444 } 445 } 446 447 // If the closure is given, run it on the unlisted nmethods. 448 // Also make sure that the effects of mark_scavenge_root_nmethods is gone. 449 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) { 450 FOR_ALL_ALIVE_BLOBS(cb) { 451 bool call_f = (f_or_null != NULL); 452 if (cb->is_nmethod()) { 453 nmethod *nm = (nmethod*)cb; 454 assert(nm->scavenge_root_not_marked(), "must be already processed"); 455 if (nm->on_scavenge_root_list()) 456 call_f = false; // don't show this one to the client 457 nm->verify_scavenge_root_oops(); 458 } else { 459 call_f = false; // not an nmethod 460 } 461 if (call_f) f_or_null->do_code_blob(cb); 462 } 463 } 464 #endif //PRODUCT 465 466 467 void CodeCache::gc_prologue() { 468 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called"); 469 } 470 471 void CodeCache::gc_epilogue() { 472 assert_locked_or_safepoint(CodeCache_lock); 473 FOR_ALL_ALIVE_BLOBS(cb) { 474 if (cb->is_nmethod()) { 475 nmethod *nm = (nmethod*)cb; 476 assert(!nm->is_unloaded(), "Tautology"); 477 if (needs_cache_clean()) { 478 nm->cleanup_inline_caches(); 479 } 480 DEBUG_ONLY(nm->verify()); 481 nm->fix_oop_relocations(); 482 } 483 } 484 set_needs_cache_clean(false); 485 prune_scavenge_root_nmethods(); 486 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 487 488 #ifdef ASSERT 489 // make sure that we aren't leaking icholders 490 int count = 0; 491 FOR_ALL_BLOBS(cb) { 492 if (cb->is_nmethod()) { 493 RelocIterator iter((nmethod*)cb); 494 while(iter.next()) { 495 if (iter.type() == relocInfo::virtual_call_type) { 496 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 497 CompiledIC *ic = CompiledIC_at(iter.reloc()); 498 if (TraceCompiledIC) { 499 tty->print("noticed icholder " INTPTR_FORMAT " ", ic->cached_icholder()); 500 ic->print(); 501 } 502 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 503 count++; 504 } 505 } 506 } 507 } 508 } 509 510 assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() == 511 CompiledICHolder::live_count(), "must agree"); 512 #endif 513 } 514 515 516 void CodeCache::verify_oops() { 517 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 518 VerifyOopClosure voc; 519 FOR_ALL_ALIVE_BLOBS(cb) { 520 if (cb->is_nmethod()) { 521 nmethod *nm = (nmethod*)cb; 522 nm->oops_do(&voc); 523 nm->verify_oop_relocations(); 524 } 525 } 526 } 527 528 529 address CodeCache::first_address() { 530 assert_locked_or_safepoint(CodeCache_lock); 531 return (address)_heap->low_boundary(); 532 } 533 534 535 address CodeCache::last_address() { 536 assert_locked_or_safepoint(CodeCache_lock); 537 return (address)_heap->high(); 538 } 539 540 /** 541 * Returns the reverse free ratio. E.g., if 25% (1/4) of the code cache 542 * is free, reverse_free_ratio() returns 4. 543 */ 544 double CodeCache::reverse_free_ratio() { 545 double unallocated_capacity = (double)(CodeCache::unallocated_capacity() - CodeCacheMinimumFreeSpace); 546 double max_capacity = (double)CodeCache::max_capacity(); 547 return max_capacity / unallocated_capacity; 548 } 549 550 void icache_init(); 551 552 void CodeCache::initialize() { 553 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points"); 554 #ifdef COMPILER2 555 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops"); 556 #endif 557 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants"); 558 // This was originally just a check of the alignment, causing failure, instead, round 559 // the code cache to the page size. In particular, Solaris is moving to a larger 560 // default page size. 561 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size()); 562 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size()); 563 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size()); 564 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) { 565 vm_exit_during_initialization("Could not reserve enough space for code cache"); 566 } 567 568 MemoryService::add_code_heap_memory_pool(_heap); 569 570 // Initialize ICache flush mechanism 571 // This service is needed for os::register_code_area 572 icache_init(); 573 574 // Give OS a chance to register generated code area. 575 // This is used on Windows 64 bit platforms to register 576 // Structured Exception Handlers for our generated code. 577 os::register_code_area(_heap->low_boundary(), _heap->high_boundary()); 578 } 579 580 581 void codeCache_init() { 582 CodeCache::initialize(); 583 } 584 585 //------------------------------------------------------------------------------------------------ 586 587 int CodeCache::number_of_nmethods_with_dependencies() { 588 return _number_of_nmethods_with_dependencies; 589 } 590 591 void CodeCache::clear_inline_caches() { 592 assert_locked_or_safepoint(CodeCache_lock); 593 FOR_ALL_ALIVE_NMETHODS(nm) { 594 nm->clear_inline_caches(); 595 } 596 } 597 598 #ifndef PRODUCT 599 // used to keep track of how much time is spent in mark_for_deoptimization 600 static elapsedTimer dependentCheckTime; 601 static int dependentCheckCount = 0; 602 #endif // PRODUCT 603 604 605 int CodeCache::mark_for_deoptimization(DepChange& changes) { 606 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 607 608 #ifndef PRODUCT 609 dependentCheckTime.start(); 610 dependentCheckCount++; 611 #endif // PRODUCT 612 613 int number_of_marked_CodeBlobs = 0; 614 615 // search the hierarchy looking for nmethods which are affected by the loading of this class 616 617 // then search the interfaces this class implements looking for nmethods 618 // which might be dependent of the fact that an interface only had one 619 // implementor. 620 621 { No_Safepoint_Verifier nsv; 622 for (DepChange::ContextStream str(changes, nsv); str.next(); ) { 623 Klass* d = str.klass(); 624 number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes); 625 } 626 } 627 628 if (VerifyDependencies) { 629 // Turn off dependency tracing while actually testing deps. 630 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 631 632 ResourceMark rm; 633 // 'signature_buffers' is used to cache already checked dependencies. 634 GrowableArray<DependencySignatureBuffer*>* dep_signature_buffers = new GrowableArray<DependencySignatureBuffer*>(); 635 636 // Iterate over live nmethods and check dependencies of all nmethods that are not 637 // marked for deoptimization. 638 FOR_ALL_ALIVE_NMETHODS(nm) { 639 if (!nm->is_marked_for_deoptimization()) { 640 for (Dependencies::DepStream deps(nm); deps.next(); ) { 641 // Get dependency signature buffer for a specific dependency type signature 642 DependencySignatureBuffer* buffer = DependencySignatureBuffer::buffer(dep_signature_buffers, deps.type()); 643 // A DependencySignature object abstracts a dependency. 644 DependencySignature current_sig(&deps); 645 646 // Check if the current dependency is already checked 647 if (!buffer->contains(¤t_sig)) { 648 // If the dependency has not already been checked, perform the check and add the 649 // current dependency signature to the checked dependency signatures. 650 651 // Check dependency and print out an error if the dependency check fails. 652 if (deps.check_dependency() != NULL) { 653 ResourceMark rm; 654 tty->print_cr("Should have been marked for deoptimization:"); 655 changes.print(); 656 nm->print(); 657 nm->print_dependencies(); 658 } 659 // Add dependency signature to checked dependencies 660 buffer->add(¤t_sig); 661 } 662 } 663 } 664 } 665 } 666 #ifndef PRODUCT 667 dependentCheckTime.stop(); 668 #endif // PRODUCT 669 670 return number_of_marked_CodeBlobs; 671 } 672 673 674 #ifdef HOTSWAP 675 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) { 676 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 677 int number_of_marked_CodeBlobs = 0; 678 679 // Deoptimize all methods of the evolving class itself 680 Array<Method*>* old_methods = dependee->methods(); 681 for (int i = 0; i < old_methods->length(); i++) { 682 ResourceMark rm; 683 Method* old_method = old_methods->at(i); 684 nmethod *nm = old_method->code(); 685 if (nm != NULL) { 686 nm->mark_for_deoptimization(); 687 number_of_marked_CodeBlobs++; 688 } 689 } 690 691 FOR_ALL_ALIVE_NMETHODS(nm) { 692 if (nm->is_marked_for_deoptimization()) { 693 // ...Already marked in the previous pass; don't count it again. 694 } else if (nm->is_evol_dependent_on(dependee())) { 695 ResourceMark rm; 696 nm->mark_for_deoptimization(); 697 number_of_marked_CodeBlobs++; 698 } else { 699 // flush caches in case they refer to a redefined Method* 700 nm->clear_inline_caches(); 701 } 702 } 703 704 return number_of_marked_CodeBlobs; 705 } 706 #endif // HOTSWAP 707 708 709 // Deoptimize all methods 710 void CodeCache::mark_all_nmethods_for_deoptimization() { 711 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 712 FOR_ALL_ALIVE_NMETHODS(nm) { 713 nm->mark_for_deoptimization(); 714 } 715 } 716 717 718 int CodeCache::mark_for_deoptimization(Method* dependee) { 719 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 720 int number_of_marked_CodeBlobs = 0; 721 722 FOR_ALL_ALIVE_NMETHODS(nm) { 723 if (nm->is_dependent_on_method(dependee)) { 724 ResourceMark rm; 725 nm->mark_for_deoptimization(); 726 number_of_marked_CodeBlobs++; 727 } 728 } 729 730 return number_of_marked_CodeBlobs; 731 } 732 733 void CodeCache::make_marked_nmethods_zombies() { 734 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); 735 FOR_ALL_ALIVE_NMETHODS(nm) { 736 if (nm->is_marked_for_deoptimization()) { 737 738 // If the nmethod has already been made non-entrant and it can be converted 739 // then zombie it now. Otherwise make it non-entrant and it will eventually 740 // be zombied when it is no longer seen on the stack. Note that the nmethod 741 // might be "entrant" and not on the stack and so could be zombied immediately 742 // but we can't tell because we don't track it on stack until it becomes 743 // non-entrant. 744 745 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) { 746 nm->make_zombie(); 747 } else { 748 nm->make_not_entrant(); 749 } 750 } 751 } 752 } 753 754 void CodeCache::make_marked_nmethods_not_entrant() { 755 assert_locked_or_safepoint(CodeCache_lock); 756 FOR_ALL_ALIVE_NMETHODS(nm) { 757 if (nm->is_marked_for_deoptimization()) { 758 nm->make_not_entrant(); 759 } 760 } 761 } 762 763 void CodeCache::verify() { 764 _heap->verify(); 765 FOR_ALL_ALIVE_BLOBS(p) { 766 p->verify(); 767 } 768 } 769 770 void CodeCache::report_codemem_full() { 771 _codemem_full_count++; 772 EventCodeCacheFull event; 773 if (event.should_commit()) { 774 event.set_startAddress((u8)low_bound()); 775 event.set_commitedTopAddress((u8)high()); 776 event.set_reservedTopAddress((u8)high_bound()); 777 event.set_entryCount(nof_blobs()); 778 event.set_methodCount(nof_nmethods()); 779 event.set_adaptorCount(nof_adapters()); 780 event.set_unallocatedCapacity(unallocated_capacity()/K); 781 event.set_fullCount(_codemem_full_count); 782 event.commit(); 783 } 784 } 785 786 //------------------------------------------------------------------------------------------------ 787 // Non-product version 788 789 #ifndef PRODUCT 790 791 void CodeCache::verify_if_often() { 792 if (VerifyCodeCacheOften) { 793 _heap->verify(); 794 } 795 } 796 797 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) { 798 if (PrintCodeCache2) { // Need to add a new flag 799 ResourceMark rm; 800 if (size == 0) size = cb->size(); 801 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size); 802 } 803 } 804 805 void CodeCache::print_internals() { 806 int nmethodCount = 0; 807 int runtimeStubCount = 0; 808 int adapterCount = 0; 809 int deoptimizationStubCount = 0; 810 int uncommonTrapStubCount = 0; 811 int bufferBlobCount = 0; 812 int total = 0; 813 int nmethodAlive = 0; 814 int nmethodNotEntrant = 0; 815 int nmethodZombie = 0; 816 int nmethodUnloaded = 0; 817 int nmethodJava = 0; 818 int nmethodNative = 0; 819 int maxCodeSize = 0; 820 ResourceMark rm; 821 822 CodeBlob *cb; 823 for (cb = first(); cb != NULL; cb = next(cb)) { 824 total++; 825 if (cb->is_nmethod()) { 826 nmethod* nm = (nmethod*)cb; 827 828 if (Verbose && nm->method() != NULL) { 829 ResourceMark rm; 830 char *method_name = nm->method()->name_and_sig_as_C_string(); 831 tty->print("%s", method_name); 832 if(nm->is_alive()) { tty->print_cr(" alive"); } 833 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); } 834 if(nm->is_zombie()) { tty->print_cr(" zombie"); } 835 } 836 837 nmethodCount++; 838 839 if(nm->is_alive()) { nmethodAlive++; } 840 if(nm->is_not_entrant()) { nmethodNotEntrant++; } 841 if(nm->is_zombie()) { nmethodZombie++; } 842 if(nm->is_unloaded()) { nmethodUnloaded++; } 843 if(nm->is_native_method()) { nmethodNative++; } 844 845 if(nm->method() != NULL && nm->is_java_method()) { 846 nmethodJava++; 847 if (nm->insts_size() > maxCodeSize) { 848 maxCodeSize = nm->insts_size(); 849 } 850 } 851 } else if (cb->is_runtime_stub()) { 852 runtimeStubCount++; 853 } else if (cb->is_deoptimization_stub()) { 854 deoptimizationStubCount++; 855 } else if (cb->is_uncommon_trap_stub()) { 856 uncommonTrapStubCount++; 857 } else if (cb->is_adapter_blob()) { 858 adapterCount++; 859 } else if (cb->is_buffer_blob()) { 860 bufferBlobCount++; 861 } 862 } 863 864 int bucketSize = 512; 865 int bucketLimit = maxCodeSize / bucketSize + 1; 866 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode); 867 memset(buckets,0,sizeof(int) * bucketLimit); 868 869 for (cb = first(); cb != NULL; cb = next(cb)) { 870 if (cb->is_nmethod()) { 871 nmethod* nm = (nmethod*)cb; 872 if(nm->is_java_method()) { 873 buckets[nm->insts_size() / bucketSize]++; 874 } 875 } 876 } 877 tty->print_cr("Code Cache Entries (total of %d)",total); 878 tty->print_cr("-------------------------------------------------"); 879 tty->print_cr("nmethods: %d",nmethodCount); 880 tty->print_cr("\talive: %d",nmethodAlive); 881 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant); 882 tty->print_cr("\tzombie: %d",nmethodZombie); 883 tty->print_cr("\tunloaded: %d",nmethodUnloaded); 884 tty->print_cr("\tjava: %d",nmethodJava); 885 tty->print_cr("\tnative: %d",nmethodNative); 886 tty->print_cr("runtime_stubs: %d",runtimeStubCount); 887 tty->print_cr("adapters: %d",adapterCount); 888 tty->print_cr("buffer blobs: %d",bufferBlobCount); 889 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount); 890 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount); 891 tty->print_cr("\nnmethod size distribution (non-zombie java)"); 892 tty->print_cr("-------------------------------------------------"); 893 894 for(int i=0; i<bucketLimit; i++) { 895 if(buckets[i] != 0) { 896 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize); 897 tty->fill_to(40); 898 tty->print_cr("%d",buckets[i]); 899 } 900 } 901 902 FREE_C_HEAP_ARRAY(int, buckets, mtCode); 903 } 904 905 #endif // !PRODUCT 906 907 void CodeCache::print() { 908 print_summary(tty); 909 910 #ifndef PRODUCT 911 if (!Verbose) return; 912 913 CodeBlob_sizes live; 914 CodeBlob_sizes dead; 915 916 FOR_ALL_BLOBS(p) { 917 if (!p->is_alive()) { 918 dead.add(p); 919 } else { 920 live.add(p); 921 } 922 } 923 924 tty->print_cr("CodeCache:"); 925 926 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(), 927 dependentCheckTime.seconds() / dependentCheckCount); 928 929 if (!live.is_empty()) { 930 live.print("live"); 931 } 932 if (!dead.is_empty()) { 933 dead.print("dead"); 934 } 935 936 937 if (WizardMode) { 938 // print the oop_map usage 939 int code_size = 0; 940 int number_of_blobs = 0; 941 int number_of_oop_maps = 0; 942 int map_size = 0; 943 FOR_ALL_BLOBS(p) { 944 if (p->is_alive()) { 945 number_of_blobs++; 946 code_size += p->code_size(); 947 OopMapSet* set = p->oop_maps(); 948 if (set != NULL) { 949 number_of_oop_maps += set->size(); 950 map_size += set->heap_size(); 951 } 952 } 953 } 954 tty->print_cr("OopMaps"); 955 tty->print_cr(" #blobs = %d", number_of_blobs); 956 tty->print_cr(" code size = %d", code_size); 957 tty->print_cr(" #oop_maps = %d", number_of_oop_maps); 958 tty->print_cr(" map size = %d", map_size); 959 } 960 961 #endif // !PRODUCT 962 } 963 964 void CodeCache::print_summary(outputStream* st, bool detailed) { 965 size_t total = (_heap->high_boundary() - _heap->low_boundary()); 966 st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT 967 "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb", 968 total/K, (total - unallocated_capacity())/K, 969 maxCodeCacheUsed/K, unallocated_capacity()/K); 970 971 if (detailed) { 972 st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]", 973 _heap->low_boundary(), 974 _heap->high(), 975 _heap->high_boundary()); 976 st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT 977 " adapters=" UINT32_FORMAT, 978 nof_blobs(), nof_nmethods(), nof_adapters()); 979 st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ? 980 "enabled" : Arguments::mode() == Arguments::_int ? 981 "disabled (interpreter mode)" : 982 "disabled (not enough contiguous free space left)"); 983 } 984 } 985 986 void CodeCache::log_state(outputStream* st) { 987 st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'" 988 " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'", 989 nof_blobs(), nof_nmethods(), nof_adapters(), 990 unallocated_capacity()); 991 } 992