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