1 /* 2 * Copyright (c) 1997, 2012, 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 "utilities/xmlstream.hpp" 49 50 // Helper class for printing in CodeCache 51 52 class CodeBlob_sizes { 53 private: 54 int count; 55 int total_size; 56 int header_size; 57 int code_size; 58 int stub_size; 59 int relocation_size; 60 int scopes_oop_size; 61 int scopes_metadata_size; 62 int scopes_data_size; 63 int scopes_pcs_size; 64 65 public: 66 CodeBlob_sizes() { 67 count = 0; 68 total_size = 0; 69 header_size = 0; 70 code_size = 0; 71 stub_size = 0; 72 relocation_size = 0; 73 scopes_oop_size = 0; 74 scopes_metadata_size = 0; 75 scopes_data_size = 0; 76 scopes_pcs_size = 0; 77 } 78 79 int total() { return total_size; } 80 bool is_empty() { return count == 0; } 81 82 void print(const char* title) { 83 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])", 84 count, 85 title, 86 total() / K, 87 header_size * 100 / total_size, 88 relocation_size * 100 / total_size, 89 code_size * 100 / total_size, 90 stub_size * 100 / total_size, 91 scopes_oop_size * 100 / total_size, 92 scopes_metadata_size * 100 / total_size, 93 scopes_data_size * 100 / total_size, 94 scopes_pcs_size * 100 / total_size); 95 } 96 97 void add(CodeBlob* cb) { 98 count++; 99 total_size += cb->size(); 100 header_size += cb->header_size(); 101 relocation_size += cb->relocation_size(); 102 if (cb->is_nmethod()) { 103 nmethod* nm = cb->as_nmethod_or_null(); 104 code_size += nm->insts_size(); 105 stub_size += nm->stub_size(); 106 107 scopes_oop_size += nm->oops_size(); 108 scopes_metadata_size += nm->metadata_size(); 109 scopes_data_size += nm->scopes_data_size(); 110 scopes_pcs_size += nm->scopes_pcs_size(); 111 } else { 112 code_size += cb->code_size(); 113 } 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 nmethod* CodeCache::_saved_nmethods = NULL; 128 129 130 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 * Remove and return nmethod from the saved code list in order to reanimate it. 468 */ 469 nmethod* CodeCache::reanimate_saved_code(Method* m) { 470 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 471 nmethod* saved = _saved_nmethods; 472 nmethod* prev = NULL; 473 while (saved != NULL) { 474 if (saved->is_in_use() && saved->method() == m) { 475 if (prev != NULL) { 476 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); 477 } else { 478 _saved_nmethods = saved->saved_nmethod_link(); 479 } 480 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods"); 481 saved->set_speculatively_disconnected(false); 482 saved->set_saved_nmethod_link(NULL); 483 if (PrintMethodFlushing) { 484 saved->print_on(tty, " ### nmethod is reconnected"); 485 } 486 if (LogCompilation && (xtty != NULL)) { 487 ttyLocker ttyl; 488 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id()); 489 xtty->method(m); 490 xtty->stamp(); 491 xtty->end_elem(); 492 } 493 return saved; 494 } 495 prev = saved; 496 saved = saved->saved_nmethod_link(); 497 } 498 return NULL; 499 } 500 501 /** 502 * Remove nmethod from the saved code list in order to discard it permanently 503 */ 504 void CodeCache::remove_saved_code(nmethod* nm) { 505 // For conc swpr this will be called with CodeCache_lock taken by caller 506 assert_locked_or_safepoint(CodeCache_lock); 507 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods"); 508 nmethod* saved = _saved_nmethods; 509 nmethod* prev = NULL; 510 while (saved != NULL) { 511 if (saved == nm) { 512 if (prev != NULL) { 513 prev->set_saved_nmethod_link(saved->saved_nmethod_link()); 514 } else { 515 _saved_nmethods = saved->saved_nmethod_link(); 516 } 517 if (LogCompilation && (xtty != NULL)) { 518 ttyLocker ttyl; 519 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id()); 520 xtty->stamp(); 521 xtty->end_elem(); 522 } 523 return; 524 } 525 prev = saved; 526 saved = saved->saved_nmethod_link(); 527 } 528 ShouldNotReachHere(); 529 } 530 531 void CodeCache::speculatively_disconnect(nmethod* nm) { 532 assert_locked_or_safepoint(CodeCache_lock); 533 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods"); 534 nm->set_saved_nmethod_link(_saved_nmethods); 535 _saved_nmethods = nm; 536 if (PrintMethodFlushing) { 537 nm->print_on(tty, " ### nmethod is speculatively disconnected"); 538 } 539 if (LogCompilation && (xtty != NULL)) { 540 ttyLocker ttyl; 541 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id()); 542 xtty->method(nm->method()); 543 xtty->stamp(); 544 xtty->end_elem(); 545 } 546 nm->method()->clear_code(); 547 nm->set_speculatively_disconnected(true); 548 } 549 550 551 void CodeCache::gc_prologue() { 552 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called"); 553 } 554 555 556 void CodeCache::gc_epilogue() { 557 assert_locked_or_safepoint(CodeCache_lock); 558 FOR_ALL_ALIVE_BLOBS(cb) { 559 if (cb->is_nmethod()) { 560 nmethod *nm = (nmethod*)cb; 561 assert(!nm->is_unloaded(), "Tautology"); 562 if (needs_cache_clean()) { 563 nm->cleanup_inline_caches(); 564 } 565 DEBUG_ONLY(nm->verify()); 566 nm->fix_oop_relocations(); 567 } 568 } 569 set_needs_cache_clean(false); 570 prune_scavenge_root_nmethods(); 571 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 572 573 #ifdef ASSERT 574 // make sure that we aren't leaking icholders 575 int count = 0; 576 FOR_ALL_BLOBS(cb) { 577 if (cb->is_nmethod()) { 578 RelocIterator iter((nmethod*)cb); 579 while(iter.next()) { 580 if (iter.type() == relocInfo::virtual_call_type) { 581 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 582 CompiledIC *ic = CompiledIC_at(iter.reloc()); 583 if (TraceCompiledIC) { 584 tty->print("noticed icholder " INTPTR_FORMAT " ", ic->cached_icholder()); 585 ic->print(); 586 } 587 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 588 count++; 589 } 590 } 591 } 592 } 593 } 594 595 assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() == 596 CompiledICHolder::live_count(), "must agree"); 597 #endif 598 } 599 600 601 void CodeCache::verify_oops() { 602 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 603 VerifyOopClosure voc; 604 FOR_ALL_ALIVE_BLOBS(cb) { 605 if (cb->is_nmethod()) { 606 nmethod *nm = (nmethod*)cb; 607 nm->oops_do(&voc); 608 nm->verify_oop_relocations(); 609 } 610 } 611 } 612 613 614 address CodeCache::first_address() { 615 assert_locked_or_safepoint(CodeCache_lock); 616 return (address)_heap->low_boundary(); 617 } 618 619 620 address CodeCache::last_address() { 621 assert_locked_or_safepoint(CodeCache_lock); 622 return (address)_heap->high(); 623 } 624 625 /** 626 * Returns the reverse free ratio. E.g., if 25% (1/4) of the code cache 627 * is free, reverse_free_ratio() returns 4. 628 */ 629 double CodeCache::reverse_free_ratio() { 630 double unallocated_capacity = (double)(CodeCache::unallocated_capacity() - CodeCacheMinimumFreeSpace); 631 double max_capacity = (double)CodeCache::max_capacity(); 632 return max_capacity / unallocated_capacity; 633 } 634 635 void icache_init(); 636 637 void CodeCache::initialize() { 638 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points"); 639 #ifdef COMPILER2 640 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops"); 641 #endif 642 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants"); 643 // This was originally just a check of the alignment, causing failure, instead, round 644 // the code cache to the page size. In particular, Solaris is moving to a larger 645 // default page size. 646 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size()); 647 InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size()); 648 ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size()); 649 if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) { 650 vm_exit_during_initialization("Could not reserve enough space for code cache"); 651 } 652 653 MemoryService::add_code_heap_memory_pool(_heap); 654 655 // Initialize ICache flush mechanism 656 // This service is needed for os::register_code_area 657 icache_init(); 658 659 // Give OS a chance to register generated code area. 660 // This is used on Windows 64 bit platforms to register 661 // Structured Exception Handlers for our generated code. 662 os::register_code_area(_heap->low_boundary(), _heap->high_boundary()); 663 } 664 665 666 void codeCache_init() { 667 CodeCache::initialize(); 668 } 669 670 //------------------------------------------------------------------------------------------------ 671 672 int CodeCache::number_of_nmethods_with_dependencies() { 673 return _number_of_nmethods_with_dependencies; 674 } 675 676 void CodeCache::clear_inline_caches() { 677 assert_locked_or_safepoint(CodeCache_lock); 678 FOR_ALL_ALIVE_NMETHODS(nm) { 679 nm->clear_inline_caches(); 680 } 681 } 682 683 #ifndef PRODUCT 684 // used to keep track of how much time is spent in mark_for_deoptimization 685 static elapsedTimer dependentCheckTime; 686 static int dependentCheckCount = 0; 687 #endif // PRODUCT 688 689 690 int CodeCache::mark_for_deoptimization(DepChange& changes) { 691 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 692 693 #ifndef PRODUCT 694 dependentCheckTime.start(); 695 dependentCheckCount++; 696 #endif // PRODUCT 697 698 int number_of_marked_CodeBlobs = 0; 699 700 // search the hierarchy looking for nmethods which are affected by the loading of this class 701 702 // then search the interfaces this class implements looking for nmethods 703 // which might be dependent of the fact that an interface only had one 704 // implementor. 705 706 { No_Safepoint_Verifier nsv; 707 for (DepChange::ContextStream str(changes, nsv); str.next(); ) { 708 Klass* d = str.klass(); 709 number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes); 710 } 711 } 712 713 if (VerifyDependencies) { 714 // Turn off dependency tracing while actually testing deps. 715 NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) ); 716 FOR_ALL_ALIVE_NMETHODS(nm) { 717 if (!nm->is_marked_for_deoptimization() && 718 nm->check_all_dependencies()) { 719 ResourceMark rm; 720 tty->print_cr("Should have been marked for deoptimization:"); 721 changes.print(); 722 nm->print(); 723 nm->print_dependencies(); 724 } 725 } 726 } 727 728 #ifndef PRODUCT 729 dependentCheckTime.stop(); 730 #endif // PRODUCT 731 732 return number_of_marked_CodeBlobs; 733 } 734 735 736 #ifdef HOTSWAP 737 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) { 738 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 739 int number_of_marked_CodeBlobs = 0; 740 741 // Deoptimize all methods of the evolving class itself 742 Array<Method*>* old_methods = dependee->methods(); 743 for (int i = 0; i < old_methods->length(); i++) { 744 ResourceMark rm; 745 Method* old_method = old_methods->at(i); 746 nmethod *nm = old_method->code(); 747 if (nm != NULL) { 748 nm->mark_for_deoptimization(); 749 number_of_marked_CodeBlobs++; 750 } 751 } 752 753 FOR_ALL_ALIVE_NMETHODS(nm) { 754 if (nm->is_marked_for_deoptimization()) { 755 // ...Already marked in the previous pass; don't count it again. 756 } else if (nm->is_evol_dependent_on(dependee())) { 757 ResourceMark rm; 758 nm->mark_for_deoptimization(); 759 number_of_marked_CodeBlobs++; 760 } else { 761 // flush caches in case they refer to a redefined Method* 762 nm->clear_inline_caches(); 763 } 764 } 765 766 return number_of_marked_CodeBlobs; 767 } 768 #endif // HOTSWAP 769 770 771 // Deoptimize all methods 772 void CodeCache::mark_all_nmethods_for_deoptimization() { 773 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 774 FOR_ALL_ALIVE_NMETHODS(nm) { 775 nm->mark_for_deoptimization(); 776 } 777 } 778 779 780 int CodeCache::mark_for_deoptimization(Method* dependee) { 781 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 782 int number_of_marked_CodeBlobs = 0; 783 784 FOR_ALL_ALIVE_NMETHODS(nm) { 785 if (nm->is_dependent_on_method(dependee)) { 786 ResourceMark rm; 787 nm->mark_for_deoptimization(); 788 number_of_marked_CodeBlobs++; 789 } 790 } 791 792 return number_of_marked_CodeBlobs; 793 } 794 795 void CodeCache::make_marked_nmethods_zombies() { 796 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); 797 FOR_ALL_ALIVE_NMETHODS(nm) { 798 if (nm->is_marked_for_deoptimization()) { 799 800 // If the nmethod has already been made non-entrant and it can be converted 801 // then zombie it now. Otherwise make it non-entrant and it will eventually 802 // be zombied when it is no longer seen on the stack. Note that the nmethod 803 // might be "entrant" and not on the stack and so could be zombied immediately 804 // but we can't tell because we don't track it on stack until it becomes 805 // non-entrant. 806 807 if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) { 808 nm->make_zombie(); 809 } else { 810 nm->make_not_entrant(); 811 } 812 } 813 } 814 } 815 816 void CodeCache::make_marked_nmethods_not_entrant() { 817 assert_locked_or_safepoint(CodeCache_lock); 818 FOR_ALL_ALIVE_NMETHODS(nm) { 819 if (nm->is_marked_for_deoptimization()) { 820 nm->make_not_entrant(); 821 } 822 } 823 } 824 825 void CodeCache::verify() { 826 _heap->verify(); 827 FOR_ALL_ALIVE_BLOBS(p) { 828 p->verify(); 829 } 830 } 831 832 //------------------------------------------------------------------------------------------------ 833 // Non-product version 834 835 #ifndef PRODUCT 836 837 void CodeCache::verify_if_often() { 838 if (VerifyCodeCacheOften) { 839 _heap->verify(); 840 } 841 } 842 843 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) { 844 if (PrintCodeCache2) { // Need to add a new flag 845 ResourceMark rm; 846 if (size == 0) size = cb->size(); 847 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size); 848 } 849 } 850 851 void CodeCache::print_internals() { 852 int nmethodCount = 0; 853 int runtimeStubCount = 0; 854 int adapterCount = 0; 855 int deoptimizationStubCount = 0; 856 int uncommonTrapStubCount = 0; 857 int bufferBlobCount = 0; 858 int total = 0; 859 int nmethodAlive = 0; 860 int nmethodNotEntrant = 0; 861 int nmethodZombie = 0; 862 int nmethodUnloaded = 0; 863 int nmethodJava = 0; 864 int nmethodNative = 0; 865 int maxCodeSize = 0; 866 ResourceMark rm; 867 868 CodeBlob *cb; 869 for (cb = first(); cb != NULL; cb = next(cb)) { 870 total++; 871 if (cb->is_nmethod()) { 872 nmethod* nm = (nmethod*)cb; 873 874 if (Verbose && nm->method() != NULL) { 875 ResourceMark rm; 876 char *method_name = nm->method()->name_and_sig_as_C_string(); 877 tty->print("%s", method_name); 878 if(nm->is_alive()) { tty->print_cr(" alive"); } 879 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); } 880 if(nm->is_zombie()) { tty->print_cr(" zombie"); } 881 } 882 883 nmethodCount++; 884 885 if(nm->is_alive()) { nmethodAlive++; } 886 if(nm->is_not_entrant()) { nmethodNotEntrant++; } 887 if(nm->is_zombie()) { nmethodZombie++; } 888 if(nm->is_unloaded()) { nmethodUnloaded++; } 889 if(nm->is_native_method()) { nmethodNative++; } 890 891 if(nm->method() != NULL && nm->is_java_method()) { 892 nmethodJava++; 893 if (nm->insts_size() > maxCodeSize) { 894 maxCodeSize = nm->insts_size(); 895 } 896 } 897 } else if (cb->is_runtime_stub()) { 898 runtimeStubCount++; 899 } else if (cb->is_deoptimization_stub()) { 900 deoptimizationStubCount++; 901 } else if (cb->is_uncommon_trap_stub()) { 902 uncommonTrapStubCount++; 903 } else if (cb->is_adapter_blob()) { 904 adapterCount++; 905 } else if (cb->is_buffer_blob()) { 906 bufferBlobCount++; 907 } 908 } 909 910 int bucketSize = 512; 911 int bucketLimit = maxCodeSize / bucketSize + 1; 912 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode); 913 memset(buckets,0,sizeof(int) * bucketLimit); 914 915 for (cb = first(); cb != NULL; cb = next(cb)) { 916 if (cb->is_nmethod()) { 917 nmethod* nm = (nmethod*)cb; 918 if(nm->is_java_method()) { 919 buckets[nm->insts_size() / bucketSize]++; 920 } 921 } 922 } 923 tty->print_cr("Code Cache Entries (total of %d)",total); 924 tty->print_cr("-------------------------------------------------"); 925 tty->print_cr("nmethods: %d",nmethodCount); 926 tty->print_cr("\talive: %d",nmethodAlive); 927 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant); 928 tty->print_cr("\tzombie: %d",nmethodZombie); 929 tty->print_cr("\tunloaded: %d",nmethodUnloaded); 930 tty->print_cr("\tjava: %d",nmethodJava); 931 tty->print_cr("\tnative: %d",nmethodNative); 932 tty->print_cr("runtime_stubs: %d",runtimeStubCount); 933 tty->print_cr("adapters: %d",adapterCount); 934 tty->print_cr("buffer blobs: %d",bufferBlobCount); 935 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount); 936 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount); 937 tty->print_cr("\nnmethod size distribution (non-zombie java)"); 938 tty->print_cr("-------------------------------------------------"); 939 940 for(int i=0; i<bucketLimit; i++) { 941 if(buckets[i] != 0) { 942 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize); 943 tty->fill_to(40); 944 tty->print_cr("%d",buckets[i]); 945 } 946 } 947 948 FREE_C_HEAP_ARRAY(int, buckets, mtCode); 949 } 950 951 #endif // !PRODUCT 952 953 void CodeCache::print() { 954 print_summary(tty); 955 956 #ifndef PRODUCT 957 if (!Verbose) return; 958 959 CodeBlob_sizes live; 960 CodeBlob_sizes dead; 961 962 FOR_ALL_BLOBS(p) { 963 if (!p->is_alive()) { 964 dead.add(p); 965 } else { 966 live.add(p); 967 } 968 } 969 970 tty->print_cr("CodeCache:"); 971 972 tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(), 973 dependentCheckTime.seconds() / dependentCheckCount); 974 975 if (!live.is_empty()) { 976 live.print("live"); 977 } 978 if (!dead.is_empty()) { 979 dead.print("dead"); 980 } 981 982 983 if (WizardMode) { 984 // print the oop_map usage 985 int code_size = 0; 986 int number_of_blobs = 0; 987 int number_of_oop_maps = 0; 988 int map_size = 0; 989 FOR_ALL_BLOBS(p) { 990 if (p->is_alive()) { 991 number_of_blobs++; 992 code_size += p->code_size(); 993 OopMapSet* set = p->oop_maps(); 994 if (set != NULL) { 995 number_of_oop_maps += set->size(); 996 map_size += set->heap_size(); 997 } 998 } 999 } 1000 tty->print_cr("OopMaps"); 1001 tty->print_cr(" #blobs = %d", number_of_blobs); 1002 tty->print_cr(" code size = %d", code_size); 1003 tty->print_cr(" #oop_maps = %d", number_of_oop_maps); 1004 tty->print_cr(" map size = %d", map_size); 1005 } 1006 1007 #endif // !PRODUCT 1008 } 1009 1010 void CodeCache::print_summary(outputStream* st, bool detailed) { 1011 size_t total = (_heap->high_boundary() - _heap->low_boundary()); 1012 st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT 1013 "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb", 1014 total/K, (total - unallocated_capacity())/K, 1015 maxCodeCacheUsed/K, unallocated_capacity()/K); 1016 1017 if (detailed) { 1018 st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]", 1019 _heap->low_boundary(), 1020 _heap->high(), 1021 _heap->high_boundary()); 1022 st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT 1023 " adapters=" UINT32_FORMAT, 1024 nof_blobs(), nof_nmethods(), nof_adapters()); 1025 st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ? 1026 "enabled" : Arguments::mode() == Arguments::_int ? 1027 "disabled (interpreter mode)" : 1028 "disabled (not enough contiguous free space left)"); 1029 } 1030 } 1031 1032 void CodeCache::log_state(outputStream* st) { 1033 st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'" 1034 " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'", 1035 nof_blobs(), nof_nmethods(), nof_adapters(), 1036 unallocated_capacity()); 1037 } 1038