1 /*
   2  * Copyright (c) 1997, 2014, 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%%, metadata %d%%, data %d%%, pcs %d%%])",
  85                   count,
  86                   title,
  87                   (int)(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   assert_locked_or_safepoint(CodeCache_lock);
 182   assert(size > 0, "allocation request must be reasonable");
 183   if (size <= 0) {
 184     return NULL;
 185   }
 186   CodeBlob* cb = NULL;
 187   while (true) {
 188     cb = (CodeBlob*)_heap->allocate(size, is_critical);
 189     if (cb != NULL) break;
 190     if (!_heap->expand_by(CodeCacheExpansionSize)) {
 191       // Expansion failed
 192       return NULL;
 193     }
 194     if (PrintCodeCacheExtension) {
 195       ResourceMark rm;
 196       tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (" SSIZE_FORMAT " bytes)",
 197                     (intptr_t)_heap->low_boundary(), (intptr_t)_heap->high(),
 198                     (address)_heap->high() - (address)_heap->low_boundary());
 199     }
 200   }
 201   maxCodeCacheUsed = MAX2(maxCodeCacheUsed, ((address)_heap->high_boundary() -
 202                           (address)_heap->low_boundary()) - unallocated_capacity());
 203   print_trace("allocation", cb, size);
 204   _number_of_blobs++;
 205   return cb;
 206 }
 207 
 208 void CodeCache::free(CodeBlob* cb) {
 209   assert_locked_or_safepoint(CodeCache_lock);
 210 
 211   print_trace("free", cb);
 212   if (cb->is_nmethod()) {
 213     _number_of_nmethods--;
 214     if (((nmethod *)cb)->has_dependencies()) {
 215       _number_of_nmethods_with_dependencies--;
 216     }
 217   }
 218   if (cb->is_adapter_blob()) {
 219     _number_of_adapters--;
 220   }
 221   _number_of_blobs--;
 222 
 223   _heap->deallocate(cb);
 224 
 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 // Iteration over CodeBlobs
 248 
 249 #define FOR_ALL_BLOBS(var)       for (CodeBlob *var =       first() ; var != NULL; var =       next(var) )
 250 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var)))
 251 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var)))
 252 
 253 
 254 bool CodeCache::contains(void *p) {
 255   // It should be ok to call contains without holding a lock
 256   return _heap->contains(p);
 257 }
 258 
 259 
 260 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not
 261 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain
 262 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
 263 CodeBlob* CodeCache::find_blob(void* start) {
 264   CodeBlob* result = find_blob_unsafe(start);
 265   if (result == NULL) return NULL;
 266   // We could potentially look up non_entrant methods
 267   guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");
 268   return result;
 269 }
 270 
 271 nmethod* CodeCache::find_nmethod(void* start) {
 272   CodeBlob *cb = find_blob(start);
 273   assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod");
 274   return (nmethod*)cb;
 275 }
 276 
 277 
 278 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
 279   assert_locked_or_safepoint(CodeCache_lock);
 280   FOR_ALL_BLOBS(p) {
 281     f(p);
 282   }
 283 }
 284 
 285 
 286 void CodeCache::nmethods_do(void f(nmethod* nm)) {
 287   assert_locked_or_safepoint(CodeCache_lock);
 288   FOR_ALL_BLOBS(nm) {
 289     if (nm->is_nmethod()) f((nmethod*)nm);
 290   }
 291 }
 292 
 293 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) {
 294   assert_locked_or_safepoint(CodeCache_lock);
 295   FOR_ALL_ALIVE_NMETHODS(nm) {
 296     f(nm);
 297   }
 298 }
 299 
 300 int CodeCache::alignment_unit() {
 301   return (int)_heap->alignment_unit();
 302 }
 303 
 304 
 305 int CodeCache::alignment_offset() {
 306   return (int)_heap->alignment_offset();
 307 }
 308 
 309 
 310 // Mark nmethods for unloading if they contain otherwise unreachable
 311 // oops.
 312 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
 313   assert_locked_or_safepoint(CodeCache_lock);
 314   FOR_ALL_ALIVE_NMETHODS(nm) {
 315     nm->do_unloading(is_alive, unloading_occurred);
 316   }
 317 }
 318 
 319 void CodeCache::blobs_do(CodeBlobClosure* f) {
 320   assert_locked_or_safepoint(CodeCache_lock);
 321   FOR_ALL_ALIVE_BLOBS(cb) {
 322     f->do_code_blob(cb);
 323 
 324 #ifdef ASSERT
 325     if (cb->is_nmethod())
 326       ((nmethod*)cb)->verify_scavenge_root_oops();
 327 #endif //ASSERT
 328   }
 329 }
 330 
 331 // Walk the list of methods which might contain non-perm oops.
 332 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) {
 333   assert_locked_or_safepoint(CodeCache_lock);
 334 
 335   if (UseG1GC) {
 336     return;
 337   }
 338 
 339   debug_only(mark_scavenge_root_nmethods());
 340 
 341   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
 342     debug_only(cur->clear_scavenge_root_marked());
 343     assert(cur->scavenge_root_not_marked(), "");
 344     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 345 
 346     bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
 347 #ifndef PRODUCT
 348     if (TraceScavenge) {
 349       cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
 350     }
 351 #endif //PRODUCT
 352     if (is_live) {
 353       // Perform cur->oops_do(f), maybe just once per nmethod.
 354       f->do_code_blob(cur);
 355     }
 356   }
 357 
 358   // Check for stray marks.
 359   debug_only(verify_perm_nmethods(NULL));
 360 }
 361 
 362 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
 363   assert_locked_or_safepoint(CodeCache_lock);
 364 
 365   if (UseG1GC) {
 366     return;
 367   }
 368 
 369   nm->set_on_scavenge_root_list();
 370   nm->set_scavenge_root_link(_scavenge_root_nmethods);
 371   set_scavenge_root_nmethods(nm);
 372   print_trace("add_scavenge_root", nm);
 373 }
 374 
 375 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
 376   assert_locked_or_safepoint(CodeCache_lock);
 377 
 378   if (UseG1GC) {
 379     return;
 380   }
 381 
 382   print_trace("drop_scavenge_root", nm);
 383   nmethod* last = NULL;
 384   nmethod* cur = scavenge_root_nmethods();
 385   while (cur != NULL) {
 386     nmethod* next = cur->scavenge_root_link();
 387     if (cur == nm) {
 388       if (last != NULL)
 389             last->set_scavenge_root_link(next);
 390       else  set_scavenge_root_nmethods(next);
 391       nm->set_scavenge_root_link(NULL);
 392       nm->clear_on_scavenge_root_list();
 393       return;
 394     }
 395     last = cur;
 396     cur = next;
 397   }
 398   assert(false, "should have been on list");
 399 }
 400 
 401 void CodeCache::prune_scavenge_root_nmethods() {
 402   assert_locked_or_safepoint(CodeCache_lock);
 403 
 404   if (UseG1GC) {
 405     return;
 406   }
 407 
 408   debug_only(mark_scavenge_root_nmethods());
 409 
 410   nmethod* last = NULL;
 411   nmethod* cur = scavenge_root_nmethods();
 412   while (cur != NULL) {
 413     nmethod* next = cur->scavenge_root_link();
 414     debug_only(cur->clear_scavenge_root_marked());
 415     assert(cur->scavenge_root_not_marked(), "");
 416     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 417 
 418     if (!cur->is_zombie() && !cur->is_unloaded()
 419         && cur->detect_scavenge_root_oops()) {
 420       // Keep it.  Advance 'last' to prevent deletion.
 421       last = cur;
 422     } else {
 423       // Prune it from the list, so we don't have to look at it any more.
 424       print_trace("prune_scavenge_root", cur);
 425       cur->set_scavenge_root_link(NULL);
 426       cur->clear_on_scavenge_root_list();
 427       if (last != NULL)
 428             last->set_scavenge_root_link(next);
 429       else  set_scavenge_root_nmethods(next);
 430     }
 431     cur = next;
 432   }
 433 
 434   // Check for stray marks.
 435   debug_only(verify_perm_nmethods(NULL));
 436 }
 437 
 438 #ifndef PRODUCT
 439 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
 440   if (UseG1GC) {
 441     return;
 442   }
 443 
 444   // While we are here, verify the integrity of the list.
 445   mark_scavenge_root_nmethods();
 446   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
 447     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 448     cur->clear_scavenge_root_marked();
 449   }
 450   verify_perm_nmethods(f);
 451 }
 452 
 453 // Temporarily mark nmethods that are claimed to be on the non-perm list.
 454 void CodeCache::mark_scavenge_root_nmethods() {
 455   FOR_ALL_ALIVE_BLOBS(cb) {
 456     if (cb->is_nmethod()) {
 457       nmethod *nm = (nmethod*)cb;
 458       assert(nm->scavenge_root_not_marked(), "clean state");
 459       if (nm->on_scavenge_root_list())
 460         nm->set_scavenge_root_marked();
 461     }
 462   }
 463 }
 464 
 465 // If the closure is given, run it on the unlisted nmethods.
 466 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
 467 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
 468   FOR_ALL_ALIVE_BLOBS(cb) {
 469     bool call_f = (f_or_null != NULL);
 470     if (cb->is_nmethod()) {
 471       nmethod *nm = (nmethod*)cb;
 472       assert(nm->scavenge_root_not_marked(), "must be already processed");
 473       if (nm->on_scavenge_root_list())
 474         call_f = false;  // don't show this one to the client
 475       nm->verify_scavenge_root_oops();
 476     } else {
 477       call_f = false;   // not an nmethod
 478     }
 479     if (call_f)  f_or_null->do_code_blob(cb);
 480   }
 481 }
 482 #endif //PRODUCT
 483 
 484 void CodeCache::verify_clean_inline_caches() {
 485 #ifdef ASSERT
 486   FOR_ALL_ALIVE_BLOBS(cb) {
 487     if (cb->is_nmethod()) {
 488       nmethod* nm = (nmethod*)cb;
 489       assert(!nm->is_unloaded(), "Tautology");
 490       nm->verify_clean_inline_caches();
 491       nm->verify();
 492     }
 493   }
 494 #endif
 495 }
 496 
 497 void CodeCache::verify_icholder_relocations() {
 498 #ifdef ASSERT
 499   // make sure that we aren't leaking icholders
 500   int count = 0;
 501   FOR_ALL_BLOBS(cb) {
 502     if (cb->is_nmethod()) {
 503       nmethod* nm = (nmethod*)cb;
 504       count += nm->verify_icholder_relocations();
 505     }
 506   }
 507 
 508   assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() ==
 509          CompiledICHolder::live_count(), "must agree");
 510 #endif
 511 }
 512 
 513 void CodeCache::gc_prologue() {
 514 }
 515 
 516 void CodeCache::gc_epilogue() {
 517   assert_locked_or_safepoint(CodeCache_lock);
 518   FOR_ALL_ALIVE_BLOBS(cb) {
 519     if (cb->is_nmethod()) {
 520       nmethod *nm = (nmethod*)cb;
 521       assert(!nm->is_unloaded(), "Tautology");
 522       if (needs_cache_clean()) {
 523         nm->cleanup_inline_caches();
 524       }
 525       DEBUG_ONLY(nm->verify());
 526       DEBUG_ONLY(nm->verify_oop_relocations());
 527     }
 528   }
 529   set_needs_cache_clean(false);
 530   prune_scavenge_root_nmethods();
 531 
 532   verify_icholder_relocations();
 533 }
 534 
 535 void CodeCache::verify_oops() {
 536   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 537   VerifyOopClosure voc;
 538   FOR_ALL_ALIVE_BLOBS(cb) {
 539     if (cb->is_nmethod()) {
 540       nmethod *nm = (nmethod*)cb;
 541       nm->oops_do(&voc);
 542       nm->verify_oop_relocations();
 543     }
 544   }
 545 }
 546 
 547 
 548 address CodeCache::first_address() {
 549   assert_locked_or_safepoint(CodeCache_lock);
 550   return (address)_heap->low_boundary();
 551 }
 552 
 553 
 554 address CodeCache::last_address() {
 555   assert_locked_or_safepoint(CodeCache_lock);
 556   return (address)_heap->high();
 557 }
 558 
 559 /**
 560  * Returns the reverse free ratio. E.g., if 25% (1/4) of the code cache
 561  * is free, reverse_free_ratio() returns 4.
 562  */
 563 double CodeCache::reverse_free_ratio() {
 564   double unallocated_capacity = (double)(CodeCache::unallocated_capacity() - CodeCacheMinimumFreeSpace);
 565   double max_capacity = (double)CodeCache::max_capacity();
 566   return max_capacity / unallocated_capacity;
 567 }
 568 
 569 void icache_init();
 570 
 571 void CodeCache::initialize() {
 572   assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
 573 #ifdef COMPILER2
 574   assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment,  "CodeCacheSegmentSize must be large enough to align inner loops");
 575 #endif
 576   assert(CodeCacheSegmentSize >= sizeof(jdouble),    "CodeCacheSegmentSize must be large enough to align constants");
 577   // This was originally just a check of the alignment, causing failure, instead, round
 578   // the code cache to the page size.  In particular, Solaris is moving to a larger
 579   // default page size.
 580   CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
 581   InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());
 582   ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());
 583   if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {
 584     vm_exit_during_initialization("Could not reserve enough space for code cache");
 585   }
 586 
 587   MemoryService::add_code_heap_memory_pool(_heap);
 588 
 589   // Initialize ICache flush mechanism
 590   // This service is needed for os::register_code_area
 591   icache_init();
 592 
 593   // Give OS a chance to register generated code area.
 594   // This is used on Windows 64 bit platforms to register
 595   // Structured Exception Handlers for our generated code.
 596   os::register_code_area(_heap->low_boundary(), _heap->high_boundary());
 597 }
 598 
 599 
 600 void codeCache_init() {
 601   CodeCache::initialize();
 602 }
 603 
 604 //------------------------------------------------------------------------------------------------
 605 
 606 int CodeCache::number_of_nmethods_with_dependencies() {
 607   return _number_of_nmethods_with_dependencies;
 608 }
 609 
 610 void CodeCache::clear_inline_caches() {
 611   assert_locked_or_safepoint(CodeCache_lock);
 612   FOR_ALL_ALIVE_NMETHODS(nm) {
 613     nm->clear_inline_caches();
 614   }
 615 }
 616 
 617 // Keeps track of time spent for checking dependencies
 618 NOT_PRODUCT(static elapsedTimer dependentCheckTime;)
 619 
 620 int CodeCache::mark_for_deoptimization(DepChange& changes) {
 621   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 622   int number_of_marked_CodeBlobs = 0;
 623 
 624   // search the hierarchy looking for nmethods which are affected by the loading of this class
 625 
 626   // then search the interfaces this class implements looking for nmethods
 627   // which might be dependent of the fact that an interface only had one
 628   // implementor.
 629   // nmethod::check_all_dependencies works only correctly, if no safepoint
 630   // can happen
 631   No_Safepoint_Verifier nsv;
 632   for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
 633     Klass* d = str.klass();
 634     number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes);
 635   }
 636 
 637 #ifndef PRODUCT
 638   if (VerifyDependencies) {
 639     // Object pointers are used as unique identifiers for dependency arguments. This
 640     // is only possible if no safepoint, i.e., GC occurs during the verification code.
 641     dependentCheckTime.start();
 642     nmethod::check_all_dependencies(changes);
 643     dependentCheckTime.stop();
 644   }
 645 #endif
 646 
 647   return number_of_marked_CodeBlobs;
 648 }
 649 
 650 
 651 #ifdef HOTSWAP
 652 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
 653   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 654   int number_of_marked_CodeBlobs = 0;
 655 
 656   // Deoptimize all methods of the evolving class itself
 657   Array<Method*>* old_methods = dependee->methods();
 658   for (int i = 0; i < old_methods->length(); i++) {
 659     ResourceMark rm;
 660     Method* old_method = old_methods->at(i);
 661     nmethod *nm = old_method->code();
 662     if (nm != NULL) {
 663       nm->mark_for_deoptimization();
 664       number_of_marked_CodeBlobs++;
 665     }
 666   }
 667 
 668   FOR_ALL_ALIVE_NMETHODS(nm) {
 669     if (nm->is_marked_for_deoptimization()) {
 670       // ...Already marked in the previous pass; don't count it again.
 671     } else if (nm->is_evol_dependent_on(dependee())) {
 672       ResourceMark rm;
 673       nm->mark_for_deoptimization();
 674       number_of_marked_CodeBlobs++;
 675     } else  {
 676       // flush caches in case they refer to a redefined Method*
 677       nm->clear_inline_caches();
 678     }
 679   }
 680 
 681   return number_of_marked_CodeBlobs;
 682 }
 683 #endif // HOTSWAP
 684 
 685 
 686 // Deoptimize all methods
 687 void CodeCache::mark_all_nmethods_for_deoptimization() {
 688   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 689   FOR_ALL_ALIVE_NMETHODS(nm) {
 690     nm->mark_for_deoptimization();
 691   }
 692 }
 693 
 694 
 695 int CodeCache::mark_for_deoptimization(Method* dependee) {
 696   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 697   int number_of_marked_CodeBlobs = 0;
 698 
 699   FOR_ALL_ALIVE_NMETHODS(nm) {
 700     if (nm->is_dependent_on_method(dependee)) {
 701       ResourceMark rm;
 702       nm->mark_for_deoptimization();
 703       number_of_marked_CodeBlobs++;
 704     }
 705   }
 706 
 707   return number_of_marked_CodeBlobs;
 708 }
 709 
 710 void CodeCache::make_marked_nmethods_zombies() {
 711   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
 712   FOR_ALL_ALIVE_NMETHODS(nm) {
 713     if (nm->is_marked_for_deoptimization()) {
 714 
 715       // If the nmethod has already been made non-entrant and it can be converted
 716       // then zombie it now. Otherwise make it non-entrant and it will eventually
 717       // be zombied when it is no longer seen on the stack. Note that the nmethod
 718       // might be "entrant" and not on the stack and so could be zombied immediately
 719       // but we can't tell because we don't track it on stack until it becomes
 720       // non-entrant.
 721 
 722       if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {
 723         nm->make_zombie();
 724       } else {
 725         nm->make_not_entrant();
 726       }
 727     }
 728   }
 729 }
 730 
 731 void CodeCache::make_marked_nmethods_not_entrant() {
 732   assert_locked_or_safepoint(CodeCache_lock);
 733   FOR_ALL_ALIVE_NMETHODS(nm) {
 734     if (nm->is_marked_for_deoptimization()) {
 735       nm->make_not_entrant();
 736     }
 737   }
 738 }
 739 
 740 void CodeCache::verify() {
 741   _heap->verify();
 742   FOR_ALL_ALIVE_BLOBS(p) {
 743     p->verify();
 744   }
 745 }
 746 
 747 void CodeCache::report_codemem_full() {
 748   _codemem_full_count++;
 749   EventCodeCacheFull event;
 750   if (event.should_commit()) {
 751     event.set_startAddress((u8)low_bound());
 752     event.set_commitedTopAddress((u8)high());
 753     event.set_reservedTopAddress((u8)high_bound());
 754     event.set_entryCount(nof_blobs());
 755     event.set_methodCount(nof_nmethods());
 756     event.set_adaptorCount(nof_adapters());
 757     event.set_unallocatedCapacity(unallocated_capacity()/K);
 758     event.set_fullCount(_codemem_full_count);
 759     event.commit();
 760   }
 761 }
 762 
 763 void CodeCache::print_memory_overhead() {
 764   size_t wasted_bytes = 0;
 765   CodeBlob *cb;
 766   for (cb = first(); cb != NULL; cb = next(cb)) {
 767     HeapBlock* heap_block = ((HeapBlock*)cb) - 1;
 768     wasted_bytes += heap_block->length() * CodeCacheSegmentSize - cb->size();
 769   }
 770   // Print bytes that are allocated in the freelist
 771   ttyLocker ttl;
 772   tty->print_cr("Number of elements in freelist: " SSIZE_FORMAT,    freelist_length());
 773   tty->print_cr("Allocated in freelist:          " SSIZE_FORMAT "kB",  bytes_allocated_in_freelist()/K);
 774   tty->print_cr("Unused bytes in CodeBlobs:      " SSIZE_FORMAT "kB",  (wasted_bytes/K));
 775   tty->print_cr("Segment map size:               " SSIZE_FORMAT "kB",  allocated_segments()/K); // 1 byte per segment
 776 }
 777 
 778 //------------------------------------------------------------------------------------------------
 779 // Non-product version
 780 
 781 #ifndef PRODUCT
 782 
 783 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
 784   if (PrintCodeCache2) {  // Need to add a new flag
 785     ResourceMark rm;
 786     if (size == 0)  size = cb->size();
 787     tty->print_cr("CodeCache %s:  addr: " INTPTR_FORMAT ", size: 0x%x", event, p2i(cb), size);
 788   }
 789 }
 790 
 791 void CodeCache::print_internals() {
 792   int nmethodCount = 0;
 793   int runtimeStubCount = 0;
 794   int adapterCount = 0;
 795   int deoptimizationStubCount = 0;
 796   int uncommonTrapStubCount = 0;
 797   int bufferBlobCount = 0;
 798   int total = 0;
 799   int nmethodAlive = 0;
 800   int nmethodNotEntrant = 0;
 801   int nmethodZombie = 0;
 802   int nmethodUnloaded = 0;
 803   int nmethodJava = 0;
 804   int nmethodNative = 0;
 805   int max_nm_size = 0;
 806   ResourceMark rm;
 807 
 808   CodeBlob *cb;
 809   for (cb = first(); cb != NULL; cb = next(cb)) {
 810     total++;
 811     if (cb->is_nmethod()) {
 812       nmethod* nm = (nmethod*)cb;
 813 
 814       if (Verbose && nm->method() != NULL) {
 815         ResourceMark rm;
 816         char *method_name = nm->method()->name_and_sig_as_C_string();
 817         tty->print("%s", method_name);
 818         if(nm->is_alive()) { tty->print_cr(" alive"); }
 819         if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
 820         if(nm->is_zombie()) { tty->print_cr(" zombie"); }
 821       }
 822 
 823       nmethodCount++;
 824 
 825       if(nm->is_alive()) { nmethodAlive++; }
 826       if(nm->is_not_entrant()) { nmethodNotEntrant++; }
 827       if(nm->is_zombie()) { nmethodZombie++; }
 828       if(nm->is_unloaded()) { nmethodUnloaded++; }
 829       if(nm->method() != NULL && nm->is_native_method()) { nmethodNative++; }
 830 
 831       if(nm->method() != NULL && nm->is_java_method()) {
 832         nmethodJava++;
 833         max_nm_size = MAX2(max_nm_size, nm->size());
 834       }
 835     } else if (cb->is_runtime_stub()) {
 836       runtimeStubCount++;
 837     } else if (cb->is_deoptimization_stub()) {
 838       deoptimizationStubCount++;
 839     } else if (cb->is_uncommon_trap_stub()) {
 840       uncommonTrapStubCount++;
 841     } else if (cb->is_adapter_blob()) {
 842       adapterCount++;
 843     } else if (cb->is_buffer_blob()) {
 844       bufferBlobCount++;
 845     }
 846   }
 847 
 848   int bucketSize = 512;
 849   int bucketLimit = max_nm_size / bucketSize + 1;
 850   int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);
 851   memset(buckets, 0, sizeof(int) * bucketLimit);
 852 
 853   for (cb = first(); cb != NULL; cb = next(cb)) {
 854     if (cb->is_nmethod()) {
 855       nmethod* nm = (nmethod*)cb;
 856       if(nm->is_java_method()) {
 857         buckets[nm->size() / bucketSize]++;
 858        }
 859     }
 860   }
 861 
 862   tty->print_cr("Code Cache Entries (total of %d)",total);
 863   tty->print_cr("-------------------------------------------------");
 864   tty->print_cr("nmethods: %d",nmethodCount);
 865   tty->print_cr("\talive: %d",nmethodAlive);
 866   tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
 867   tty->print_cr("\tzombie: %d",nmethodZombie);
 868   tty->print_cr("\tunloaded: %d",nmethodUnloaded);
 869   tty->print_cr("\tjava: %d",nmethodJava);
 870   tty->print_cr("\tnative: %d",nmethodNative);
 871   tty->print_cr("runtime_stubs: %d",runtimeStubCount);
 872   tty->print_cr("adapters: %d",adapterCount);
 873   tty->print_cr("buffer blobs: %d",bufferBlobCount);
 874   tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
 875   tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
 876   tty->print_cr("\nnmethod size distribution (non-zombie java)");
 877   tty->print_cr("-------------------------------------------------");
 878 
 879   for(int i=0; i<bucketLimit; i++) {
 880     if(buckets[i] != 0) {
 881       tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
 882       tty->fill_to(40);
 883       tty->print_cr("%d",buckets[i]);
 884     }
 885   }
 886 
 887   FREE_C_HEAP_ARRAY(int, buckets, mtCode);
 888   print_memory_overhead();
 889 }
 890 
 891 #endif // !PRODUCT
 892 
 893 void CodeCache::print() {
 894   print_summary(tty);
 895 
 896 #ifndef PRODUCT
 897   if (!Verbose) return;
 898 
 899   CodeBlob_sizes live;
 900   CodeBlob_sizes dead;
 901 
 902   FOR_ALL_BLOBS(p) {
 903     if (!p->is_alive()) {
 904       dead.add(p);
 905     } else {
 906       live.add(p);
 907     }
 908   }
 909 
 910   tty->print_cr("CodeCache:");
 911   tty->print_cr("nmethod dependency checking time %fs", dependentCheckTime.seconds());
 912 
 913   if (!live.is_empty()) {
 914     live.print("live");
 915   }
 916   if (!dead.is_empty()) {
 917     dead.print("dead");
 918   }
 919 
 920 
 921   if (WizardMode) {
 922      // print the oop_map usage
 923     int code_size = 0;
 924     int number_of_blobs = 0;
 925     int number_of_oop_maps = 0;
 926     int map_size = 0;
 927     FOR_ALL_BLOBS(p) {
 928       if (p->is_alive()) {
 929         number_of_blobs++;
 930         code_size += p->code_size();
 931         OopMapSet* set = p->oop_maps();
 932         if (set != NULL) {
 933           number_of_oop_maps += set->size();
 934           map_size           += set->heap_size();
 935         }
 936       }
 937     }
 938     tty->print_cr("OopMaps");
 939     tty->print_cr("  #blobs    = %d", number_of_blobs);
 940     tty->print_cr("  code size = %d", code_size);
 941     tty->print_cr("  #oop_maps = %d", number_of_oop_maps);
 942     tty->print_cr("  map size  = %d", map_size);
 943   }
 944 
 945 #endif // !PRODUCT
 946 }
 947 
 948 void CodeCache::print_summary(outputStream* st, bool detailed) {
 949   size_t total = (_heap->high_boundary() - _heap->low_boundary());
 950   st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT
 951                "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",
 952                total/K, (total - unallocated_capacity())/K,
 953                maxCodeCacheUsed/K, unallocated_capacity()/K);
 954 
 955   if (detailed) {
 956     st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",
 957                  p2i(_heap->low_boundary()),
 958                  p2i(_heap->high()),
 959                  p2i(_heap->high_boundary()));
 960     st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT
 961                  " adapters=" UINT32_FORMAT,
 962                  nof_blobs(), nof_nmethods(), nof_adapters());
 963     st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ?
 964                  "enabled" : Arguments::mode() == Arguments::_int ?
 965                  "disabled (interpreter mode)" :
 966                  "disabled (not enough contiguous free space left)");
 967   }
 968 }
 969 
 970 void CodeCache::log_state(outputStream* st) {
 971   st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"
 972             " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",
 973             nof_blobs(), nof_nmethods(), nof_adapters(),
 974             unallocated_capacity());
 975 }
 976