1 /*
   2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"

  26 #include "code/codeBlob.hpp"
  27 #include "code/codeCache.hpp"
  28 #include "code/compiledIC.hpp"
  29 #include "code/dependencies.hpp"
  30 #include "code/icBuffer.hpp"
  31 #include "code/nmethod.hpp"
  32 #include "code/pcDesc.hpp"
  33 #include "compiler/compileBroker.hpp"
  34 #include "gc_implementation/shared/markSweep.hpp"
  35 #include "memory/allocation.inline.hpp"
  36 #include "memory/gcLocker.hpp"
  37 #include "memory/iterator.hpp"
  38 #include "memory/resourceArea.hpp"
  39 #include "oops/method.hpp"
  40 #include "oops/objArrayOop.hpp"
  41 #include "oops/oop.inline.hpp"

  42 #include "runtime/handles.inline.hpp"
  43 #include "runtime/arguments.hpp"
  44 #include "runtime/icache.hpp"
  45 #include "runtime/java.hpp"
  46 #include "runtime/mutexLocker.hpp"

  47 #include "services/memoryService.hpp"
  48 #include "trace/tracing.hpp"
  49 #include "utilities/xmlstream.hpp"
  50 
  51 // Helper class for printing in CodeCache
  52 
  53 class CodeBlob_sizes {
  54  private:
  55   int count;
  56   int total_size;
  57   int header_size;
  58   int code_size;
  59   int stub_size;
  60   int relocation_size;
  61   int scopes_oop_size;
  62   int scopes_metadata_size;
  63   int scopes_data_size;
  64   int scopes_pcs_size;
  65 
  66  public:
  67   CodeBlob_sizes() {
  68     count            = 0;
  69     total_size       = 0;
  70     header_size      = 0;
  71     code_size        = 0;
  72     stub_size        = 0;
  73     relocation_size  = 0;
  74     scopes_oop_size  = 0;
  75     scopes_metadata_size  = 0;
  76     scopes_data_size = 0;
  77     scopes_pcs_size  = 0;
  78   }
  79 
  80   int total()                                    { return total_size; }
  81   bool is_empty()                                { return count == 0; }
  82 
  83   void print(const char* title) {
  84     tty->print_cr(" #%d %s = %dK (hdr %d%%,  loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])",
  85                   count,
  86                   title,
  87                   total() / K,
  88                   header_size             * 100 / total_size,
  89                   relocation_size         * 100 / total_size,
  90                   code_size               * 100 / total_size,
  91                   stub_size               * 100 / total_size,
  92                   scopes_oop_size         * 100 / total_size,
  93                   scopes_metadata_size    * 100 / total_size,
  94                   scopes_data_size        * 100 / total_size,
  95                   scopes_pcs_size         * 100 / total_size);
  96   }
  97 
  98   void add(CodeBlob* cb) {
  99     count++;
 100     total_size       += cb->size();
 101     header_size      += cb->header_size();
 102     relocation_size  += cb->relocation_size();
 103     if (cb->is_nmethod()) {
 104       nmethod* nm = cb->as_nmethod_or_null();
 105       code_size        += nm->insts_size();
 106       stub_size        += nm->stub_size();
 107 
 108       scopes_oop_size  += nm->oops_size();
 109       scopes_metadata_size  += nm->metadata_size();
 110       scopes_data_size += nm->scopes_data_size();
 111       scopes_pcs_size  += nm->scopes_pcs_size();
 112     } else {
 113       code_size        += cb->code_size();
 114     }
 115   }
 116 };
 117 
 118 // CodeCache implementation







 119 
 120 CodeHeap * CodeCache::_heap = new CodeHeap();

 121 int CodeCache::_number_of_blobs = 0;
 122 int CodeCache::_number_of_adapters = 0;
 123 int CodeCache::_number_of_nmethods = 0;
 124 int CodeCache::_number_of_nmethods_with_dependencies = 0;
 125 bool CodeCache::_needs_cache_clean = false;
 126 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
 127 
 128 int CodeCache::_codemem_full_count = 0;
 129 
 130 CodeBlob* CodeCache::first() {
 131   assert_locked_or_safepoint(CodeCache_lock);
 132   return (CodeBlob*)_heap->first();









































































































 133 }
 134 





 135 
 136 CodeBlob* CodeCache::next(CodeBlob* cb) {
 137   assert_locked_or_safepoint(CodeCache_lock);
 138   return (CodeBlob*)_heap->next(cb);
 139 }
 140 


 141 
 142 CodeBlob* CodeCache::alive(CodeBlob *cb) {
 143   assert_locked_or_safepoint(CodeCache_lock);
 144   while (cb != NULL && !cb->is_alive()) cb = next(cb);
 145   return cb;


 146 }
 147 








 148 
 149 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) {
 150   assert_locked_or_safepoint(CodeCache_lock);
 151   while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb);
 152   return (nmethod*)cb;


 153 }
 154 
 155 nmethod* CodeCache::first_nmethod() {
 156   assert_locked_or_safepoint(CodeCache_lock);
 157   CodeBlob* cb = first();
 158   while (cb != NULL && !cb->is_nmethod()) {
 159     cb = next(cb);
 160   }
 161   return (nmethod*)cb;
 162 }
 163 
 164 nmethod* CodeCache::next_nmethod (CodeBlob* cb) {
 165   assert_locked_or_safepoint(CodeCache_lock);
 166   cb = next(cb);
 167   while (cb != NULL && !cb->is_nmethod()) {
 168     cb = next(cb);
 169   }
 170   return (nmethod*)cb;
 171 }
 172 
 173 static size_t maxCodeCacheUsed = 0;







 174 
 175 CodeBlob* CodeCache::allocate(int size, bool is_critical) {
 176   // Do not seize the CodeCache lock here--if the caller has not
 177   // already done so, we are going to lose bigtime, since the code
 178   // cache will contain a garbage CodeBlob until the caller can
 179   // run the constructor for the CodeBlob subclass he is busy
 180   // instantiating.
 181   guarantee(size >= 0, "allocation request must be reasonable");
 182   assert_locked_or_safepoint(CodeCache_lock);
 183   CodeBlob* cb = NULL;
 184   _number_of_blobs++;





 185   while (true) {
 186     cb = (CodeBlob*)_heap->allocate(size, is_critical);
 187     if (cb != NULL) break;
 188     if (!_heap->expand_by(CodeCacheExpansionSize)) {
 189       // Expansion failed
 190       return NULL;
 191     }
 192     if (PrintCodeCacheExtension) {
 193       ResourceMark rm;
 194       tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)",
 195                     (intptr_t)_heap->low_boundary(), (intptr_t)_heap->high(),
 196                     (address)_heap->high() - (address)_heap->low_boundary());
 197     }
 198   }
 199   maxCodeCacheUsed = MAX2(maxCodeCacheUsed, ((address)_heap->high_boundary() -
 200                           (address)_heap->low_boundary()) - unallocated_capacity());
 201   print_trace("allocation", cb, size);

 202   return cb;
 203 }
 204 
 205 void CodeCache::free(CodeBlob* cb) {
 206   assert_locked_or_safepoint(CodeCache_lock);
 207 
 208   print_trace("free", cb);
 209   if (cb->is_nmethod()) {
 210     _number_of_nmethods--;
 211     if (((nmethod *)cb)->has_dependencies()) {
 212       _number_of_nmethods_with_dependencies--;
 213     }
 214   }
 215   if (cb->is_adapter_blob()) {
 216     _number_of_adapters--;
 217   }
 218   _number_of_blobs--;
 219 
 220   _heap->deallocate(cb);

 221 
 222   assert(_number_of_blobs >= 0, "sanity check");
 223 }
 224 
 225 
 226 void CodeCache::commit(CodeBlob* cb) {
 227   // this is called by nmethod::nmethod, which must already own CodeCache_lock
 228   assert_locked_or_safepoint(CodeCache_lock);
 229   if (cb->is_nmethod()) {
 230     _number_of_nmethods++;
 231     if (((nmethod *)cb)->has_dependencies()) {
 232       _number_of_nmethods_with_dependencies++;
 233     }
 234   }
 235   if (cb->is_adapter_blob()) {
 236     _number_of_adapters++;
 237   }
 238 
 239   // flush the hardware I-cache
 240   ICache::invalidate_range(cb->content_begin(), cb->content_size());
 241 }
 242 
 243 
 244 // Iteration over CodeBlobs
 245 
 246 #define FOR_ALL_BLOBS(var)       for (CodeBlob *var =       first() ; var != NULL; var =       next(var) )
 247 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var)))
 248 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var)))
 249 
 250 
 251 bool CodeCache::contains(void *p) {
 252   // It should be ok to call contains without holding a lock
 253   return _heap->contains(p);





 254 }
 255 
 256 
 257 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not
 258 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain
 259 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
 260 CodeBlob* CodeCache::find_blob(void* start) {
 261   CodeBlob* result = find_blob_unsafe(start);
 262   if (result == NULL) return NULL;
 263   // We could potentially look up non_entrant methods
 264   guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");
 265   return result;
 266 }
 267 















 268 nmethod* CodeCache::find_nmethod(void* start) {
 269   CodeBlob *cb = find_blob(start);
 270   assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod");
 271   return (nmethod*)cb;
 272 }
 273 








 274 
 275 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
 276   assert_locked_or_safepoint(CodeCache_lock);
 277   FOR_ALL_BLOBS(p) {
 278     f(p);


 279   }
 280 }
 281 
 282 
 283 void CodeCache::nmethods_do(void f(nmethod* nm)) {
 284   assert_locked_or_safepoint(CodeCache_lock);
 285   FOR_ALL_BLOBS(nm) {
 286     if (nm->is_nmethod()) f((nmethod*)nm);


 287   }
 288 }
 289 
 290 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) {
 291   assert_locked_or_safepoint(CodeCache_lock);
 292   FOR_ALL_ALIVE_NMETHODS(nm) {
 293     f(nm);


 294   }
 295 }
 296 
 297 int CodeCache::alignment_unit() {
 298   return (int)_heap->alignment_unit();
 299 }
 300 
 301 
 302 int CodeCache::alignment_offset() {
 303   return (int)_heap->alignment_offset();
 304 }
 305 
 306 
 307 // Mark nmethods for unloading if they contain otherwise unreachable
 308 // oops.
 309 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
 310   assert_locked_or_safepoint(CodeCache_lock);
 311   FOR_ALL_ALIVE_NMETHODS(nm) {


 312     nm->do_unloading(is_alive, unloading_occurred);
 313   }

 314 }
 315 
 316 void CodeCache::blobs_do(CodeBlobClosure* f) {
 317   assert_locked_or_safepoint(CodeCache_lock);
 318   FOR_ALL_ALIVE_BLOBS(cb) {


 319     f->do_code_blob(cb);
 320 
 321 #ifdef ASSERT
 322     if (cb->is_nmethod())
 323       ((nmethod*)cb)->verify_scavenge_root_oops();
 324 #endif //ASSERT
 325   }


 326 }
 327 
 328 // Walk the list of methods which might contain non-perm oops.
 329 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) {
 330   assert_locked_or_safepoint(CodeCache_lock);
 331   debug_only(mark_scavenge_root_nmethods());
 332 
 333   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
 334     debug_only(cur->clear_scavenge_root_marked());
 335     assert(cur->scavenge_root_not_marked(), "");
 336     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 337 
 338     bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
 339 #ifndef PRODUCT
 340     if (TraceScavenge) {
 341       cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
 342     }
 343 #endif //PRODUCT
 344     if (is_live) {
 345       // Perform cur->oops_do(f), maybe just once per nmethod.
 346       f->do_code_blob(cur);
 347     }
 348   }
 349 
 350   // Check for stray marks.
 351   debug_only(verify_perm_nmethods(NULL));
 352 }
 353 
 354 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
 355   assert_locked_or_safepoint(CodeCache_lock);
 356   nm->set_on_scavenge_root_list();
 357   nm->set_scavenge_root_link(_scavenge_root_nmethods);
 358   set_scavenge_root_nmethods(nm);
 359   print_trace("add_scavenge_root", nm);
 360 }
 361 
 362 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
 363   assert_locked_or_safepoint(CodeCache_lock);
 364   print_trace("drop_scavenge_root", nm);
 365   nmethod* last = NULL;
 366   nmethod* cur = scavenge_root_nmethods();
 367   while (cur != NULL) {
 368     nmethod* next = cur->scavenge_root_link();
 369     if (cur == nm) {
 370       if (last != NULL)
 371             last->set_scavenge_root_link(next);
 372       else  set_scavenge_root_nmethods(next);
 373       nm->set_scavenge_root_link(NULL);
 374       nm->clear_on_scavenge_root_list();
 375       return;
 376     }
 377     last = cur;
 378     cur = next;
 379   }
 380   assert(false, "should have been on list");
 381 }
 382 
 383 void CodeCache::prune_scavenge_root_nmethods() {
 384   assert_locked_or_safepoint(CodeCache_lock);
 385   debug_only(mark_scavenge_root_nmethods());
 386 
 387   nmethod* last = NULL;
 388   nmethod* cur = scavenge_root_nmethods();
 389   while (cur != NULL) {
 390     nmethod* next = cur->scavenge_root_link();
 391     debug_only(cur->clear_scavenge_root_marked());
 392     assert(cur->scavenge_root_not_marked(), "");
 393     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 394 
 395     if (!cur->is_zombie() && !cur->is_unloaded()
 396         && cur->detect_scavenge_root_oops()) {
 397       // Keep it.  Advance 'last' to prevent deletion.
 398       last = cur;
 399     } else {
 400       // Prune it from the list, so we don't have to look at it any more.
 401       print_trace("prune_scavenge_root", cur);
 402       cur->set_scavenge_root_link(NULL);
 403       cur->clear_on_scavenge_root_list();
 404       if (last != NULL)
 405             last->set_scavenge_root_link(next);
 406       else  set_scavenge_root_nmethods(next);
 407     }
 408     cur = next;
 409   }
 410 
 411   // Check for stray marks.
 412   debug_only(verify_perm_nmethods(NULL));
 413 }
 414 
 415 #ifndef PRODUCT
 416 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
 417   // While we are here, verify the integrity of the list.
 418   mark_scavenge_root_nmethods();
 419   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
 420     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
 421     cur->clear_scavenge_root_marked();
 422   }
 423   verify_perm_nmethods(f);
 424 }
 425 
 426 // Temporarily mark nmethods that are claimed to be on the non-perm list.
 427 void CodeCache::mark_scavenge_root_nmethods() {
 428   FOR_ALL_ALIVE_BLOBS(cb) {
 429     if (cb->is_nmethod()) {
 430       nmethod *nm = (nmethod*)cb;
 431       assert(nm->scavenge_root_not_marked(), "clean state");
 432       if (nm->on_scavenge_root_list())
 433         nm->set_scavenge_root_marked();
 434     }
 435   }
 436 }
 437 
 438 // If the closure is given, run it on the unlisted nmethods.
 439 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
 440 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
 441   FOR_ALL_ALIVE_BLOBS(cb) {


 442     bool call_f = (f_or_null != NULL);
 443     if (cb->is_nmethod()) {
 444       nmethod *nm = (nmethod*)cb;
 445       assert(nm->scavenge_root_not_marked(), "must be already processed");
 446       if (nm->on_scavenge_root_list())
 447         call_f = false;  // don't show this one to the client
 448       nm->verify_scavenge_root_oops();
 449     } else {
 450       call_f = false;   // not an nmethod
 451     }
 452     if (call_f)  f_or_null->do_code_blob(cb);
 453   }
 454 }
 455 #endif //PRODUCT
 456 
 457 
 458 void CodeCache::gc_prologue() {
 459   assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called");
 460 }
 461 
 462 void CodeCache::gc_epilogue() {
 463   assert_locked_or_safepoint(CodeCache_lock);
 464   FOR_ALL_ALIVE_BLOBS(cb) {
 465     if (cb->is_nmethod()) {
 466       nmethod *nm = (nmethod*)cb;
 467       assert(!nm->is_unloaded(), "Tautology");
 468       if (needs_cache_clean()) {
 469         nm->cleanup_inline_caches();
 470       }
 471       DEBUG_ONLY(nm->verify());
 472       nm->fix_oop_relocations();
 473     }
 474   }
 475   set_needs_cache_clean(false);
 476   prune_scavenge_root_nmethods();
 477   assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");
 478 
 479 #ifdef ASSERT
 480   // make sure that we aren't leaking icholders
 481   int count = 0;
 482   FOR_ALL_BLOBS(cb) {
 483     if (cb->is_nmethod()) {
 484       RelocIterator iter((nmethod*)cb);
 485       while(iter.next()) {
 486         if (iter.type() == relocInfo::virtual_call_type) {
 487           if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {
 488             CompiledIC *ic = CompiledIC_at(iter.reloc());
 489             if (TraceCompiledIC) {
 490               tty->print("noticed icholder " INTPTR_FORMAT " ", ic->cached_icholder());
 491               ic->print();
 492             }
 493             assert(ic->cached_icholder() != NULL, "must be non-NULL");
 494             count++;
 495           }
 496         }
 497       }
 498     }
 499   }
 500 
 501   assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() ==
 502          CompiledICHolder::live_count(), "must agree");
 503 #endif
 504 }
 505 
 506 
 507 void CodeCache::verify_oops() {
 508   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 509   VerifyOopClosure voc;
 510   FOR_ALL_ALIVE_BLOBS(cb) {
 511     if (cb->is_nmethod()) {
 512       nmethod *nm = (nmethod*)cb;
 513       nm->oops_do(&voc);
 514       nm->verify_oop_relocations();
 515     }
 516   }
 517 }
 518 
 519 
 520 address CodeCache::first_address() {
 521   assert_locked_or_safepoint(CodeCache_lock);
 522   return (address)_heap->low_boundary();


 523 }
 524 







 525 
 526 address CodeCache::last_address() {
 527   assert_locked_or_safepoint(CodeCache_lock);
 528   return (address)_heap->high();



 529 }
 530 
 531 /**
 532  * Returns the reverse free ratio. E.g., if 25% (1/4) of the code cache
 533  * is free, reverse_free_ratio() returns 4.
 534  */
 535 double CodeCache::reverse_free_ratio() {
 536   double unallocated_capacity = (double)(CodeCache::unallocated_capacity() - CodeCacheMinimumFreeSpace);
 537   double max_capacity = (double)CodeCache::max_capacity();






 538   return max_capacity / unallocated_capacity;
 539 }
 540 
























 541 void icache_init();
 542 
 543 void CodeCache::initialize() {
 544   assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
 545 #ifdef COMPILER2
 546   assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment,  "CodeCacheSegmentSize must be large enough to align inner loops");
 547 #endif
 548   assert(CodeCacheSegmentSize >= sizeof(jdouble),    "CodeCacheSegmentSize must be large enough to align constants");
 549   // This was originally just a check of the alignment, causing failure, instead, round
 550   // the code cache to the page size.  In particular, Solaris is moving to a larger
 551   // default page size.
 552   CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
 553   InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());
 554   ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());
 555   if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {
 556     vm_exit_during_initialization("Could not reserve enough space for code cache");
 557   }
 558 
 559   MemoryService::add_code_heap_memory_pool(_heap);

 560 
 561   // Initialize ICache flush mechanism
 562   // This service is needed for os::register_code_area
 563   icache_init();
 564 
 565   // Give OS a chance to register generated code area.
 566   // This is used on Windows 64 bit platforms to register
 567   // Structured Exception Handlers for our generated code.
 568   os::register_code_area(_heap->low_boundary(), _heap->high_boundary());
 569 }
 570 
 571 
 572 void codeCache_init() {
 573   CodeCache::initialize();
 574 }
 575 
 576 //------------------------------------------------------------------------------------------------
 577 
 578 int CodeCache::number_of_nmethods_with_dependencies() {
 579   return _number_of_nmethods_with_dependencies;
 580 }
 581 
 582 void CodeCache::clear_inline_caches() {
 583   assert_locked_or_safepoint(CodeCache_lock);
 584   FOR_ALL_ALIVE_NMETHODS(nm) {


 585     nm->clear_inline_caches();
 586   }

 587 }
 588 
 589 // Keeps track of time spent for checking dependencies
 590 NOT_PRODUCT(static elapsedTimer dependentCheckTime;)
 591 
 592 int CodeCache::mark_for_deoptimization(DepChange& changes) {
 593   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 594   int number_of_marked_CodeBlobs = 0;
 595 
 596   // search the hierarchy looking for nmethods which are affected by the loading of this class
 597 
 598   // then search the interfaces this class implements looking for nmethods
 599   // which might be dependent of the fact that an interface only had one
 600   // implementor.
 601   // nmethod::check_all_dependencies works only correctly, if no safepoint
 602   // can happen
 603   No_Safepoint_Verifier nsv;
 604   for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
 605     Klass* d = str.klass();
 606     number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes);
 607   }
 608 
 609 #ifndef PRODUCT
 610   if (VerifyDependencies) {
 611     // Object pointers are used as unique identifiers for dependency arguments. This
 612     // is only possible if no safepoint, i.e., GC occurs during the verification code.
 613     dependentCheckTime.start();
 614     nmethod::check_all_dependencies(changes);
 615     dependentCheckTime.stop();
 616   }
 617 #endif
 618 
 619   return number_of_marked_CodeBlobs;
 620 }
 621 
 622 
 623 #ifdef HOTSWAP
 624 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {
 625   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 626   int number_of_marked_CodeBlobs = 0;
 627 
 628   // Deoptimize all methods of the evolving class itself
 629   Array<Method*>* old_methods = dependee->methods();
 630   for (int i = 0; i < old_methods->length(); i++) {
 631     ResourceMark rm;
 632     Method* old_method = old_methods->at(i);
 633     nmethod *nm = old_method->code();
 634     if (nm != NULL) {
 635       nm->mark_for_deoptimization();
 636       number_of_marked_CodeBlobs++;
 637     }
 638   }
 639 
 640   FOR_ALL_ALIVE_NMETHODS(nm) {


 641     if (nm->is_marked_for_deoptimization()) {
 642       // ...Already marked in the previous pass; don't count it again.
 643     } else if (nm->is_evol_dependent_on(dependee())) {
 644       ResourceMark rm;
 645       nm->mark_for_deoptimization();
 646       number_of_marked_CodeBlobs++;
 647     } else  {
 648       // flush caches in case they refer to a redefined Method*
 649       nm->clear_inline_caches();
 650     }
 651   }

 652 
 653   return number_of_marked_CodeBlobs;
 654 }
 655 #endif // HOTSWAP
 656 
 657 
 658 // Deoptimize all methods
 659 void CodeCache::mark_all_nmethods_for_deoptimization() {
 660   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 661   FOR_ALL_ALIVE_NMETHODS(nm) {


 662     nm->mark_for_deoptimization();
 663   }

 664 }
 665 
 666 
 667 int CodeCache::mark_for_deoptimization(Method* dependee) {
 668   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 669   int number_of_marked_CodeBlobs = 0;
 670 
 671   FOR_ALL_ALIVE_NMETHODS(nm) {


 672     if (nm->is_dependent_on_method(dependee)) {
 673       ResourceMark rm;
 674       nm->mark_for_deoptimization();
 675       number_of_marked_CodeBlobs++;
 676     }
 677   }

 678 
 679   return number_of_marked_CodeBlobs;
 680 }
 681 
 682 void CodeCache::make_marked_nmethods_zombies() {
 683   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
 684   FOR_ALL_ALIVE_NMETHODS(nm) {


 685     if (nm->is_marked_for_deoptimization()) {
 686 
 687       // If the nmethod has already been made non-entrant and it can be converted
 688       // then zombie it now. Otherwise make it non-entrant and it will eventually
 689       // be zombied when it is no longer seen on the stack. Note that the nmethod
 690       // might be "entrant" and not on the stack and so could be zombied immediately
 691       // but we can't tell because we don't track it on stack until it becomes
 692       // non-entrant.
 693 
 694       if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {
 695         nm->make_zombie();
 696       } else {
 697         nm->make_not_entrant();
 698       }
 699     }
 700   }

 701 }
 702 
 703 void CodeCache::make_marked_nmethods_not_entrant() {
 704   assert_locked_or_safepoint(CodeCache_lock);
 705   FOR_ALL_ALIVE_NMETHODS(nm) {


 706     if (nm->is_marked_for_deoptimization()) {
 707       nm->make_not_entrant();
 708     }
 709   }

 710 }
 711 
 712 void CodeCache::verify() {
 713   _heap->verify();
 714   FOR_ALL_ALIVE_BLOBS(p) {
 715     p->verify();






 716   }
 717 }
 718 
 719 void CodeCache::report_codemem_full() {






















 720   _codemem_full_count++;
 721   EventCodeCacheFull event;
 722   if (event.should_commit()) {
 723     event.set_startAddress((u8)low_bound());
 724     event.set_commitedTopAddress((u8)high());
 725     event.set_reservedTopAddress((u8)high_bound());

 726     event.set_entryCount(nof_blobs());
 727     event.set_methodCount(nof_nmethods());
 728     event.set_adaptorCount(nof_adapters());
 729     event.set_unallocatedCapacity(unallocated_capacity()/K);
 730     event.set_fullCount(_codemem_full_count);
 731     event.commit();
 732   }
 733 }
 734 
 735 void CodeCache::print_memory_overhead() {
 736   size_t wasted_bytes = 0;
 737   CodeBlob *cb;
 738   for (cb = first(); cb != NULL; cb = next(cb)) {



 739     HeapBlock* heap_block = ((HeapBlock*)cb) - 1;
 740     wasted_bytes += heap_block->length() * CodeCacheSegmentSize - cb->size();
 741   }

 742   // Print bytes that are allocated in the freelist
 743   ttyLocker ttl;
 744   tty->print_cr("Number of elements in freelist: %d",    freelist_length());
 745   tty->print_cr("Allocated in freelist:          %dkB",  bytes_allocated_in_freelist()/K);
 746   tty->print_cr("Unused bytes in CodeBlobs:      %dkB",  (int)(wasted_bytes/K));
 747   tty->print_cr("Segment map size:               %dkB",  allocated_segments()/K); // 1 byte per segment
 748 }
 749 
 750 //------------------------------------------------------------------------------------------------
 751 // Non-product version
 752 
 753 #ifndef PRODUCT
 754 
 755 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
 756   if (PrintCodeCache2) {  // Need to add a new flag
 757     ResourceMark rm;
 758     if (size == 0)  size = cb->size();
 759     tty->print_cr("CodeCache %s:  addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size);
 760   }
 761 }
 762 
 763 void CodeCache::print_internals() {
 764   int nmethodCount = 0;
 765   int runtimeStubCount = 0;
 766   int adapterCount = 0;
 767   int deoptimizationStubCount = 0;
 768   int uncommonTrapStubCount = 0;
 769   int bufferBlobCount = 0;
 770   int total = 0;
 771   int nmethodAlive = 0;
 772   int nmethodNotEntrant = 0;
 773   int nmethodZombie = 0;
 774   int nmethodUnloaded = 0;
 775   int nmethodJava = 0;
 776   int nmethodNative = 0;
 777   int max_nm_size = 0;
 778   ResourceMark rm;
 779 
 780   CodeBlob *cb;
 781   for (cb = first(); cb != NULL; cb = next(cb)) {




 782     total++;
 783     if (cb->is_nmethod()) {
 784       nmethod* nm = (nmethod*)cb;
 785 
 786       if (Verbose && nm->method() != NULL) {
 787         ResourceMark rm;
 788         char *method_name = nm->method()->name_and_sig_as_C_string();
 789         tty->print("%s", method_name);
 790         if(nm->is_alive()) { tty->print_cr(" alive"); }
 791         if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
 792         if(nm->is_zombie()) { tty->print_cr(" zombie"); }
 793       }
 794 
 795       nmethodCount++;
 796 
 797       if(nm->is_alive()) { nmethodAlive++; }
 798       if(nm->is_not_entrant()) { nmethodNotEntrant++; }
 799       if(nm->is_zombie()) { nmethodZombie++; }
 800       if(nm->is_unloaded()) { nmethodUnloaded++; }
 801       if(nm->method() != NULL && nm->is_native_method()) { nmethodNative++; }
 802 
 803       if(nm->method() != NULL && nm->is_java_method()) {
 804         nmethodJava++;
 805         max_nm_size = MAX2(max_nm_size, nm->size());
 806       }
 807     } else if (cb->is_runtime_stub()) {
 808       runtimeStubCount++;
 809     } else if (cb->is_deoptimization_stub()) {
 810       deoptimizationStubCount++;
 811     } else if (cb->is_uncommon_trap_stub()) {
 812       uncommonTrapStubCount++;
 813     } else if (cb->is_adapter_blob()) {
 814       adapterCount++;
 815     } else if (cb->is_buffer_blob()) {
 816       bufferBlobCount++;
 817     }
 818   }

 819 
 820   int bucketSize = 512;
 821   int bucketLimit = max_nm_size / bucketSize + 1;
 822   int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);
 823   memset(buckets, 0, sizeof(int) * bucketLimit);
 824 
 825   for (cb = first(); cb != NULL; cb = next(cb)) {
 826     if (cb->is_nmethod()) {
 827       nmethod* nm = (nmethod*)cb;
 828       if(nm->is_java_method()) {
 829         buckets[nm->size() / bucketSize]++;
 830        }
 831     }
 832   }
 833 
 834   tty->print_cr("Code Cache Entries (total of %d)",total);
 835   tty->print_cr("-------------------------------------------------");
 836   tty->print_cr("nmethods: %d",nmethodCount);
 837   tty->print_cr("\talive: %d",nmethodAlive);
 838   tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
 839   tty->print_cr("\tzombie: %d",nmethodZombie);
 840   tty->print_cr("\tunloaded: %d",nmethodUnloaded);
 841   tty->print_cr("\tjava: %d",nmethodJava);
 842   tty->print_cr("\tnative: %d",nmethodNative);
 843   tty->print_cr("runtime_stubs: %d",runtimeStubCount);
 844   tty->print_cr("adapters: %d",adapterCount);
 845   tty->print_cr("buffer blobs: %d",bufferBlobCount);
 846   tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
 847   tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
 848   tty->print_cr("\nnmethod size distribution (non-zombie java)");
 849   tty->print_cr("-------------------------------------------------");
 850 
 851   for(int i=0; i<bucketLimit; i++) {
 852     if(buckets[i] != 0) {
 853       tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
 854       tty->fill_to(40);
 855       tty->print_cr("%d",buckets[i]);
 856     }
 857   }
 858 
 859   FREE_C_HEAP_ARRAY(int, buckets, mtCode);
 860   print_memory_overhead();
 861 }
 862 
 863 #endif // !PRODUCT
 864 
 865 void CodeCache::print() {
 866   print_summary(tty);
 867 
 868 #ifndef PRODUCT
 869   if (!Verbose) return;
 870 
 871   CodeBlob_sizes live;
 872   CodeBlob_sizes dead;
 873 
 874   FOR_ALL_BLOBS(p) {
 875     if (!p->is_alive()) {
 876       dead.add(p);

 877     } else {
 878       live.add(p);

 879     }
 880   }
 881 
 882   tty->print_cr("CodeCache:");
 883   tty->print_cr("nmethod dependency checking time %fs", dependentCheckTime.seconds());
 884 
 885   if (!live.is_empty()) {
 886     live.print("live");
 887   }
 888   if (!dead.is_empty()) {
 889     dead.print("dead");
 890   }
 891 
 892 
 893   if (WizardMode) {
 894      // print the oop_map usage
 895     int code_size = 0;
 896     int number_of_blobs = 0;
 897     int number_of_oop_maps = 0;
 898     int map_size = 0;
 899     FOR_ALL_BLOBS(p) {
 900       if (p->is_alive()) {

 901         number_of_blobs++;
 902         code_size += p->code_size();
 903         OopMapSet* set = p->oop_maps();
 904         if (set != NULL) {
 905           number_of_oop_maps += set->size();
 906           map_size           += set->heap_size();
 907         }
 908       }
 909     }

 910     tty->print_cr("OopMaps");
 911     tty->print_cr("  #blobs    = %d", number_of_blobs);
 912     tty->print_cr("  code size = %d", code_size);
 913     tty->print_cr("  #oop_maps = %d", number_of_oop_maps);
 914     tty->print_cr("  map size  = %d", map_size);
 915   }
 916 
 917 #endif // !PRODUCT
 918 }
 919 
 920 void CodeCache::print_summary(outputStream* st, bool detailed) {
 921   size_t total = (_heap->high_boundary() - _heap->low_boundary());
 922   st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT



 923                "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",
 924                total/K, (total - unallocated_capacity())/K,
 925                maxCodeCacheUsed/K, unallocated_capacity()/K);
 926 
 927   if (detailed) {
 928     st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",
 929                  _heap->low_boundary(),
 930                  _heap->high(),
 931                  _heap->high_boundary());
 932     st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT
 933                  " adapters=" UINT32_FORMAT,
 934                  nof_blobs(), nof_nmethods(), nof_adapters());



 935     st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ?
 936                  "enabled" : Arguments::mode() == Arguments::_int ?
 937                  "disabled (interpreter mode)" :
 938                  "disabled (not enough contiguous free space left)");
 939   }
 940 }
 941 
 942 void CodeCache::log_state(outputStream* st) {
 943   st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"
 944             " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",
 945             nof_blobs(), nof_nmethods(), nof_adapters(),
 946             unallocated_capacity());
 947 }
 948 
--- EOF ---