Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "code/codeBlob.hpp"

 #include "code/codeCache.hpp"

 #include "code/compiledIC.hpp"

 #include "code/dependencies.hpp"

 #include "code/icBuffer.hpp"

 #include "code/nmethod.hpp"

 #include "code/pcDesc.hpp"

 #include "compiler/compileBroker.hpp"

 #include "gc_implementation/shared/markSweep.hpp"

 #include "memory/allocation.inline.hpp"

 #include "memory/gcLocker.hpp"

 #include "memory/iterator.hpp"

 #include "memory/resourceArea.hpp"

 #include "oops/method.hpp"

 #include "oops/objArrayOop.hpp"

 #include "oops/oop.inline.hpp"

 #include "runtime/handles.inline.hpp"

 #include "runtime/arguments.hpp"

 #include "runtime/icache.hpp"

 #include "runtime/java.hpp"

 #include "runtime/mutexLocker.hpp"

 #include "services/memoryService.hpp"

 #include "utilities/xmlstream.hpp"

 // Helper class for printing in CodeCache

 class CodeBlob_sizes {

  private:

   int count;

   int total_size;

   int header_size;

   int code_size;

   int stub_size;

   int relocation_size;

   int scopes_oop_size;

   int scopes_metadata_size;

   int scopes_data_size;

   int scopes_pcs_size;

  public:

   CodeBlob_sizes() {

     count            = 0;

     total_size       = 0;

     header_size      = 0;

     code_size        = 0;

     stub_size        = 0;

     relocation_size  = 0;

     scopes_oop_size  = 0;

     scopes_metadata_size  = 0;

     scopes_data_size = 0;

     scopes_pcs_size  = 0;

   }

   int total()                                    { return total_size; }

   bool is_empty()                                { return count == 0; }

   void print(const char* title) {

     tty->print_cr(" #%d %s = %dK (hdr %d%%,  loc %d%%, code %d%%, stub %d%%, [oops %d%%, data %d%%, pcs %d%%])",

                   count,

                   title,

                   total() / K,

                   header_size             * 100 / total_size,

                   relocation_size         * 100 / total_size,

                   code_size               * 100 / total_size,

                   stub_size               * 100 / total_size,

                   scopes_oop_size         * 100 / total_size,

                   scopes_metadata_size    * 100 / total_size,

                   scopes_data_size        * 100 / total_size,

                   scopes_pcs_size         * 100 / total_size);

   }

   void add(CodeBlob* cb) {

     count++;

     total_size       += cb->size();

     header_size      += cb->header_size();

     relocation_size  += cb->relocation_size();

     if (cb->is_nmethod()) {

       nmethod* nm = cb->as_nmethod_or_null();

       code_size        += nm->insts_size();

       stub_size        += nm->stub_size();

       scopes_oop_size  += nm->oops_size();

       scopes_metadata_size  += nm->metadata_size();

       scopes_data_size += nm->scopes_data_size();

       scopes_pcs_size  += nm->scopes_pcs_size();

     } else {

       code_size        += cb->code_size();

     }

   }

 };

 // CodeCache implementation

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

 int CodeCache::_number_of_blobs = 0;

 int CodeCache::_number_of_adapters = 0;

 int CodeCache::_number_of_nmethods = 0;

 int CodeCache::_number_of_nmethods_with_dependencies = 0;

 bool CodeCache::_needs_cache_clean = false;

 nmethod* CodeCache::_scavenge_root_nmethods = NULL;

 nmethod* CodeCache::_saved_nmethods = NULL;

 CodeBlob* CodeCache::first() {

   assert_locked_or_safepoint(CodeCache_lock);

   return (CodeBlob*)_heap->first();

 }

 CodeBlob* CodeCache::next(CodeBlob* cb) {

   assert_locked_or_safepoint(CodeCache_lock);

   return (CodeBlob*)_heap->next(cb);

 }

 CodeBlob* CodeCache::alive(CodeBlob *cb) {

   assert_locked_or_safepoint(CodeCache_lock);

   while (cb != NULL && !cb->is_alive()) cb = next(cb);

   return cb;

 }

 nmethod* CodeCache::alive_nmethod(CodeBlob* cb) {

   assert_locked_or_safepoint(CodeCache_lock);

   while (cb != NULL && (!cb->is_alive() || !cb->is_nmethod())) cb = next(cb);

   return (nmethod*)cb;

 }

 nmethod* CodeCache::first_nmethod() {

   assert_locked_or_safepoint(CodeCache_lock);

   CodeBlob* cb = first();

   while (cb != NULL && !cb->is_nmethod()) {

     cb = next(cb);

   }

   return (nmethod*)cb;

 }

 nmethod* CodeCache::next_nmethod (CodeBlob* cb) {

   assert_locked_or_safepoint(CodeCache_lock);

   cb = next(cb);

   while (cb != NULL && !cb->is_nmethod()) {

     cb = next(cb);

   }

   return (nmethod*)cb;

 }

 static size_t maxCodeCacheUsed = 0;

 CodeBlob* CodeCache::allocate(int size, bool is_critical) {

   // Do not seize the CodeCache lock here--if the caller has not

   // already done so, we are going to lose bigtime, since the code

   // cache will contain a garbage CodeBlob until the caller can

   // run the constructor for the CodeBlob subclass he is busy

   // instantiating.

   guarantee(size >= 0, "allocation request must be reasonable");

   assert_locked_or_safepoint(CodeCache_lock);

   CodeBlob* cb = NULL;

   _number_of_blobs++;

   while (true) {

     cb = (CodeBlob*)_heap->allocate(size, is_critical);

     if (cb != NULL) break;

     if (!_heap->expand_by(CodeCacheExpansionSize)) {

       // Expansion failed

       return NULL;

     }

     if (PrintCodeCacheExtension) {

       ResourceMark rm;

       tty->print_cr("code cache extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%d bytes)",

                     (intptr_t)_heap->low_boundary(), (intptr_t)_heap->high(),

                     (address)_heap->high() - (address)_heap->low_boundary());

     }

   }

   maxCodeCacheUsed = MAX2(maxCodeCacheUsed, ((address)_heap->high_boundary() -

                           (address)_heap->low_boundary()) - unallocated_capacity());

   verify_if_often();

   print_trace("allocation", cb, size);

   return cb;

 }

 void CodeCache::free(CodeBlob* cb) {

   assert_locked_or_safepoint(CodeCache_lock);

   verify_if_often();

   print_trace("free", cb);

   if (cb->is_nmethod()) {

     _number_of_nmethods--;

     if (((nmethod *)cb)->has_dependencies()) {

       _number_of_nmethods_with_dependencies--;

     }

   }

   if (cb->is_adapter_blob()) {

     _number_of_adapters--;

   }

   _number_of_blobs--;

   _heap->deallocate(cb);

   verify_if_often();

   assert(_number_of_blobs >= 0, "sanity check");

 }

 void CodeCache::commit(CodeBlob* cb) {

   // this is called by nmethod::nmethod, which must already own CodeCache_lock

   assert_locked_or_safepoint(CodeCache_lock);

   if (cb->is_nmethod()) {

     _number_of_nmethods++;

     if (((nmethod *)cb)->has_dependencies()) {

       _number_of_nmethods_with_dependencies++;

     }

   }

   if (cb->is_adapter_blob()) {

     _number_of_adapters++;

   }

   // flush the hardware I-cache

   ICache::invalidate_range(cb->content_begin(), cb->content_size());

 }

 void CodeCache::flush() {

   assert_locked_or_safepoint(CodeCache_lock);

   Unimplemented();

 }

 // Iteration over CodeBlobs

 #define FOR_ALL_BLOBS(var)       for (CodeBlob *var =       first() ; var != NULL; var =       next(var) )

 #define FOR_ALL_ALIVE_BLOBS(var) for (CodeBlob *var = alive(first()); var != NULL; var = alive(next(var)))

 #define FOR_ALL_ALIVE_NMETHODS(var) for (nmethod *var = alive_nmethod(first()); var != NULL; var = alive_nmethod(next(var)))

 bool CodeCache::contains(void *p) {

   // It should be ok to call contains without holding a lock

   return _heap->contains(p);

 }

 // This method is safe to call without holding the CodeCache_lock, as long as a dead codeblob is not

 // looked up (i.e., one that has been marked for deletion). It only dependes on the _segmap to contain

 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.

 CodeBlob* CodeCache::find_blob(void* start) {

   CodeBlob* result = find_blob_unsafe(start);

   if (result == NULL) return NULL;

   // We could potientially look up non_entrant methods

   guarantee(!result->is_zombie() || result->is_locked_by_vm() || is_error_reported(), "unsafe access to zombie method");

   return result;

 }

 nmethod* CodeCache::find_nmethod(void* start) {

   CodeBlob *cb = find_blob(start);

   assert(cb == NULL || cb->is_nmethod(), "did not find an nmethod");

   return (nmethod*)cb;

 }

 void CodeCache::blobs_do(void f(CodeBlob* nm)) {

   assert_locked_or_safepoint(CodeCache_lock);

   FOR_ALL_BLOBS(p) {

     f(p);

   }

 }

 void CodeCache::nmethods_do(void f(nmethod* nm)) {

   assert_locked_or_safepoint(CodeCache_lock);

   FOR_ALL_BLOBS(nm) {

     if (nm->is_nmethod()) f((nmethod*)nm);

   }

 }

 void CodeCache::alive_nmethods_do(void f(nmethod* nm)) {

   assert_locked_or_safepoint(CodeCache_lock);

   FOR_ALL_ALIVE_NMETHODS(nm) {

     f(nm);

   }

 }

 int CodeCache::alignment_unit() {

   return (int)_heap->alignment_unit();

 }

 int CodeCache::alignment_offset() {

   return (int)_heap->alignment_offset();

 }

 // Mark nmethods for unloading if they contain otherwise unreachable

 // oops.

 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {

   assert_locked_or_safepoint(CodeCache_lock);

   FOR_ALL_ALIVE_NMETHODS(nm) {

     nm->do_unloading(is_alive, unloading_occurred);

   }

 }

 void CodeCache::blobs_do(CodeBlobClosure* f) {

   assert_locked_or_safepoint(CodeCache_lock);

   FOR_ALL_ALIVE_BLOBS(cb) {

     f->do_code_blob(cb);

 #ifdef ASSERT

     if (cb->is_nmethod())

       ((nmethod*)cb)->verify_scavenge_root_oops();

 #endif //ASSERT

   }

 }

 // Walk the list of methods which might contain non-perm oops.

 void CodeCache::scavenge_root_nmethods_do(CodeBlobClosure* f) {

   assert_locked_or_safepoint(CodeCache_lock);

   debug_only(mark_scavenge_root_nmethods());

   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {

     debug_only(cur->clear_scavenge_root_marked());

     assert(cur->scavenge_root_not_marked(), "");

     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");

     bool is_live = (!cur->is_zombie() && !cur->is_unloaded());

 #ifndef PRODUCT

     if (TraceScavenge) {

       cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();

     }

 #endif //PRODUCT

     if (is_live) {

       // Perform cur->oops_do(f), maybe just once per nmethod.

       f->do_code_blob(cur);

     }

   }

   // Check for stray marks.

   debug_only(verify_perm_nmethods(NULL));

 }

 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {

   assert_locked_or_safepoint(CodeCache_lock);

   nm->set_on_scavenge_root_list();

   nm->set_scavenge_root_link(_scavenge_root_nmethods);

   set_scavenge_root_nmethods(nm);

   print_trace("add_scavenge_root", nm);

 }

 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {

   assert_locked_or_safepoint(CodeCache_lock);

   print_trace("drop_scavenge_root", nm);

   nmethod* last = NULL;

   nmethod* cur = scavenge_root_nmethods();

   while (cur != NULL) {

     nmethod* next = cur->scavenge_root_link();

     if (cur == nm) {

       if (last != NULL)

             last->set_scavenge_root_link(next);

       else  set_scavenge_root_nmethods(next);

       nm->set_scavenge_root_link(NULL);

       nm->clear_on_scavenge_root_list();

       return;

     }

     last = cur;

     cur = next;

   }

   assert(false, "should have been on list");

 }

 void CodeCache::prune_scavenge_root_nmethods() {

   assert_locked_or_safepoint(CodeCache_lock);

   debug_only(mark_scavenge_root_nmethods());

   nmethod* last = NULL;

   nmethod* cur = scavenge_root_nmethods();

   while (cur != NULL) {

     nmethod* next = cur->scavenge_root_link();

     debug_only(cur->clear_scavenge_root_marked());

     assert(cur->scavenge_root_not_marked(), "");

     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");

     if (!cur->is_zombie() && !cur->is_unloaded()

         && cur->detect_scavenge_root_oops()) {

       // Keep it.  Advance 'last' to prevent deletion.

       last = cur;

     } else {

       // Prune it from the list, so we don't have to look at it any more.

       print_trace("prune_scavenge_root", cur);

       cur->set_scavenge_root_link(NULL);

       cur->clear_on_scavenge_root_list();

       if (last != NULL)

             last->set_scavenge_root_link(next);

       else  set_scavenge_root_nmethods(next);

     }

     cur = next;

   }

   // Check for stray marks.

   debug_only(verify_perm_nmethods(NULL));

 }

 #ifndef PRODUCT

 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {

   // While we are here, verify the integrity of the list.

   mark_scavenge_root_nmethods();

   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {

     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");

     cur->clear_scavenge_root_marked();

   }

   verify_perm_nmethods(f);

 }

 // Temporarily mark nmethods that are claimed to be on the non-perm list.

 void CodeCache::mark_scavenge_root_nmethods() {

   FOR_ALL_ALIVE_BLOBS(cb) {

     if (cb->is_nmethod()) {

       nmethod *nm = (nmethod*)cb;

       assert(nm->scavenge_root_not_marked(), "clean state");

       if (nm->on_scavenge_root_list())

         nm->set_scavenge_root_marked();

     }

   }

 }

 // If the closure is given, run it on the unlisted nmethods.

 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.

 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {

   FOR_ALL_ALIVE_BLOBS(cb) {

     bool call_f = (f_or_null != NULL);

     if (cb->is_nmethod()) {

       nmethod *nm = (nmethod*)cb;

       assert(nm->scavenge_root_not_marked(), "must be already processed");

       if (nm->on_scavenge_root_list())

         call_f = false;  // don't show this one to the client

       nm->verify_scavenge_root_oops();

     } else {

       call_f = false;   // not an nmethod

     }

     if (call_f)  f_or_null->do_code_blob(cb);

   }

 }

 #endif //PRODUCT

 /**

  * Remove and return nmethod from the saved code list in order to reanimate it.

  */

 nmethod* CodeCache::reanimate_saved_code(Method* m) {

   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

   nmethod* saved = _saved_nmethods;

   nmethod* prev = NULL;

   while (saved != NULL) {

     if (saved->is_in_use() && saved->method() == m) {

       if (prev != NULL) {

         prev->set_saved_nmethod_link(saved->saved_nmethod_link());

       } else {

         _saved_nmethods = saved->saved_nmethod_link();

       }

       assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods");

       saved->set_speculatively_disconnected(false);

       saved->set_saved_nmethod_link(NULL);

       if (PrintMethodFlushing) {

         saved->print_on(tty, " ### nmethod is reconnected");

       }

       if (LogCompilation && (xtty != NULL)) {

         ttyLocker ttyl;

         xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id());

         xtty->method(m);

         xtty->stamp();

         xtty->end_elem();

       }

       return saved;

     }

     prev = saved;

     saved = saved->saved_nmethod_link();

   }

   return NULL;

 }

 /**

  * Remove nmethod from the saved code list in order to discard it permanently

  */

 void CodeCache::remove_saved_code(nmethod* nm) {

   // For conc swpr this will be called with CodeCache_lock taken by caller

   assert_locked_or_safepoint(CodeCache_lock);

   assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods");

   nmethod* saved = _saved_nmethods;

   nmethod* prev = NULL;

   while (saved != NULL) {

     if (saved == nm) {

       if (prev != NULL) {

         prev->set_saved_nmethod_link(saved->saved_nmethod_link());

       } else {

         _saved_nmethods = saved->saved_nmethod_link();

       }

       if (LogCompilation && (xtty != NULL)) {

         ttyLocker ttyl;

         xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id());

         xtty->stamp();

         xtty->end_elem();

       }

       return;

     }

     prev = saved;

     saved = saved->saved_nmethod_link();

   }

   ShouldNotReachHere();

 }

 void CodeCache::speculatively_disconnect(nmethod* nm) {

   assert_locked_or_safepoint(CodeCache_lock);

   assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods");

   nm->set_saved_nmethod_link(_saved_nmethods);

   _saved_nmethods = nm;

   if (PrintMethodFlushing) {

     nm->print_on(tty, " ### nmethod is speculatively disconnected");

   }

   if (LogCompilation && (xtty != NULL)) {

     ttyLocker ttyl;

     xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id());

     xtty->method(nm->method());

     xtty->stamp();

     xtty->end_elem();

   }

   nm->method()->clear_code();

   nm->set_speculatively_disconnected(true);

 }

 void CodeCache::gc_prologue() {

   assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called");

 }

 void CodeCache::gc_epilogue() {

   assert_locked_or_safepoint(CodeCache_lock);

   FOR_ALL_ALIVE_BLOBS(cb) {

     if (cb->is_nmethod()) {

       nmethod *nm = (nmethod*)cb;

       assert(!nm->is_unloaded(), "Tautology");

       if (needs_cache_clean()) {

         nm->cleanup_inline_caches();

       }

       DEBUG_ONLY(nm->verify());

       nm->fix_oop_relocations();

     }

   }

   set_needs_cache_clean(false);

   prune_scavenge_root_nmethods();

   assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called");

 #ifdef ASSERT

   // make sure that we aren't leaking icholders

   int count = 0;

   FOR_ALL_BLOBS(cb) {

     if (cb->is_nmethod()) {

       RelocIterator iter((nmethod*)cb);

       while(iter.next()) {

         if (iter.type() == relocInfo::virtual_call_type) {

           if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) {

             CompiledIC *ic = CompiledIC_at(iter.reloc());

             if (TraceCompiledIC) {

               tty->print("noticed icholder " INTPTR_FORMAT " ", ic->cached_icholder());

               ic->print();

             }

             assert(ic->cached_icholder() != NULL, "must be non-NULL");

             count++;

           }

         }

       }

     }

   }

   assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() ==

          CompiledICHolder::live_count(), "must agree");

 #endif

 }

 void CodeCache::verify_oops() {

   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

   VerifyOopClosure voc;

   FOR_ALL_ALIVE_BLOBS(cb) {

     if (cb->is_nmethod()) {

       nmethod *nm = (nmethod*)cb;

       nm->oops_do(&voc);

       nm->verify_oop_relocations();

     }

   }

 }

 address CodeCache::first_address() {

   assert_locked_or_safepoint(CodeCache_lock);

   return (address)_heap->low_boundary();

 }

 address CodeCache::last_address() {

   assert_locked_or_safepoint(CodeCache_lock);

   return (address)_heap->high();

 }

 void icache_init();

 void CodeCache::initialize() {

   assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");

 #ifdef COMPILER2

   assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment,  "CodeCacheSegmentSize must be large enough to align inner loops");

 #endif

   assert(CodeCacheSegmentSize >= sizeof(jdouble),    "CodeCacheSegmentSize must be large enough to align constants");

   // This was originally just a check of the alignment, causing failure, instead, round

   // the code cache to the page size.  In particular, Solaris is moving to a larger

   // default page size.

   CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());

   InitialCodeCacheSize = round_to(InitialCodeCacheSize, os::vm_page_size());

   ReservedCodeCacheSize = round_to(ReservedCodeCacheSize, os::vm_page_size());

   if (!_heap->reserve(ReservedCodeCacheSize, InitialCodeCacheSize, CodeCacheSegmentSize)) {

     vm_exit_during_initialization("Could not reserve enough space for code cache");

   }

   MemoryService::add_code_heap_memory_pool(_heap);

   // Initialize ICache flush mechanism

   // This service is needed for os::register_code_area

   icache_init();

   // Give OS a chance to register generated code area.

   // This is used on Windows 64 bit platforms to register

   // Structured Exception Handlers for our generated code.

   os::register_code_area(_heap->low_boundary(), _heap->high_boundary());

 }

 void codeCache_init() {

   CodeCache::initialize();

 }

 //------------------------------------------------------------------------------------------------

 int CodeCache::number_of_nmethods_with_dependencies() {

   return _number_of_nmethods_with_dependencies;

 }

 void CodeCache::clear_inline_caches() {

   assert_locked_or_safepoint(CodeCache_lock);

   FOR_ALL_ALIVE_NMETHODS(nm) {

     nm->clear_inline_caches();

   }

 }

 #ifndef PRODUCT

 // used to keep track of how much time is spent in mark_for_deoptimization

 static elapsedTimer dependentCheckTime;

 static int dependentCheckCount = 0;

 #endif // PRODUCT

 int CodeCache::mark_for_deoptimization(DepChange& changes) {

   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

 #ifndef PRODUCT

   dependentCheckTime.start();

   dependentCheckCount++;

 #endif // PRODUCT

   int number_of_marked_CodeBlobs = 0;

   // search the hierarchy looking for nmethods which are affected by the loading of this class

   // then search the interfaces this class implements looking for nmethods

   // which might be dependent of the fact that an interface only had one

   // implementor.

   { No_Safepoint_Verifier nsv;

     for (DepChange::ContextStream str(changes, nsv); str.next(); ) {

       Klass* d = str.klass();

       number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes);

     }

   }

   if (VerifyDependencies) {

     // Turn off dependency tracing while actually testing deps.

     NOT_PRODUCT( FlagSetting fs(TraceDependencies, false) );

     FOR_ALL_ALIVE_NMETHODS(nm) {

       if (!nm->is_marked_for_deoptimization() &&

           nm->check_all_dependencies()) {

         ResourceMark rm;

         tty->print_cr("Should have been marked for deoptimization:");

         changes.print();

         nm->print();

         nm->print_dependencies();

       }

     }

   }

 #ifndef PRODUCT

   dependentCheckTime.stop();

 #endif // PRODUCT

   return number_of_marked_CodeBlobs;

 }

 #ifdef HOTSWAP

 int CodeCache::mark_for_evol_deoptimization(instanceKlassHandle dependee) {

   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

   int number_of_marked_CodeBlobs = 0;

   // Deoptimize all methods of the evolving class itself

   Array<Method*>* old_methods = dependee->methods();

   for (int i = 0; i < old_methods->length(); i++) {

     ResourceMark rm;

     Method* old_method = old_methods->at(i);

     nmethod *nm = old_method->code();

     if (nm != NULL) {

       nm->mark_for_deoptimization();

       number_of_marked_CodeBlobs++;

     }

   }

   FOR_ALL_ALIVE_NMETHODS(nm) {

     if (nm->is_marked_for_deoptimization()) {

       // ...Already marked in the previous pass; don't count it again.

     } else if (nm->is_evol_dependent_on(dependee())) {

       ResourceMark rm;

       nm->mark_for_deoptimization();

       number_of_marked_CodeBlobs++;

     } else  {

       // flush caches in case they refer to a redefined Method*

       nm->clear_inline_caches();

     }

   }

   return number_of_marked_CodeBlobs;

 }

 #endif // HOTSWAP

 // Deoptimize all methods

 void CodeCache::mark_all_nmethods_for_deoptimization() {

   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

   FOR_ALL_ALIVE_NMETHODS(nm) {

     nm->mark_for_deoptimization();

   }

 }

 int CodeCache::mark_for_deoptimization(Method* dependee) {

   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

   int number_of_marked_CodeBlobs = 0;

   FOR_ALL_ALIVE_NMETHODS(nm) {

     if (nm->is_dependent_on_method(dependee)) {

       ResourceMark rm;

       nm->mark_for_deoptimization();

       number_of_marked_CodeBlobs++;

     }

   }

   return number_of_marked_CodeBlobs;

 }

 void CodeCache::make_marked_nmethods_zombies() {

   assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");

   FOR_ALL_ALIVE_NMETHODS(nm) {

     if (nm->is_marked_for_deoptimization()) {

       // If the nmethod has already been made non-entrant and it can be converted

       // then zombie it now. Otherwise make it non-entrant and it will eventually

       // be zombied when it is no longer seen on the stack. Note that the nmethod

       // might be "entrant" and not on the stack and so could be zombied immediately

       // but we can't tell because we don't track it on stack until it becomes

       // non-entrant.

       if (nm->is_not_entrant() && nm->can_not_entrant_be_converted()) {

         nm->make_zombie();

       } else {

         nm->make_not_entrant();

       }

     }

   }

 }

 void CodeCache::make_marked_nmethods_not_entrant() {

   assert_locked_or_safepoint(CodeCache_lock);

   FOR_ALL_ALIVE_NMETHODS(nm) {

     if (nm->is_marked_for_deoptimization()) {

       nm->make_not_entrant();

     }

   }

 }

 void CodeCache::verify() {

   _heap->verify();

   FOR_ALL_ALIVE_BLOBS(p) {

     p->verify();

   }

 }

 //------------------------------------------------------------------------------------------------

 // Non-product version

 #ifndef PRODUCT

 void CodeCache::verify_if_often() {

   if (VerifyCodeCacheOften) {

     _heap->verify();

   }

 }

 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {

   if (PrintCodeCache2) {  // Need to add a new flag

     ResourceMark rm;

     if (size == 0)  size = cb->size();

     tty->print_cr("CodeCache %s:  addr: " INTPTR_FORMAT ", size: 0x%x", event, cb, size);

   }

 }

 void CodeCache::print_internals() {

   int nmethodCount = 0;

   int runtimeStubCount = 0;

   int adapterCount = 0;

   int deoptimizationStubCount = 0;

   int uncommonTrapStubCount = 0;

   int bufferBlobCount = 0;

   int total = 0;

   int nmethodAlive = 0;

   int nmethodNotEntrant = 0;

   int nmethodZombie = 0;

   int nmethodUnloaded = 0;

   int nmethodJava = 0;

   int nmethodNative = 0;

   int maxCodeSize = 0;

   ResourceMark rm;

   CodeBlob *cb;

   for (cb = first(); cb != NULL; cb = next(cb)) {

     total++;

     if (cb->is_nmethod()) {

       nmethod* nm = (nmethod*)cb;

       if (Verbose && nm->method() != NULL) {

         ResourceMark rm;

         char *method_name = nm->method()->name_and_sig_as_C_string();

         tty->print("%s", method_name);

         if(nm->is_alive()) { tty->print_cr(" alive"); }

         if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }

         if(nm->is_zombie()) { tty->print_cr(" zombie"); }

       }

       nmethodCount++;

       if(nm->is_alive()) { nmethodAlive++; }

       if(nm->is_not_entrant()) { nmethodNotEntrant++; }

       if(nm->is_zombie()) { nmethodZombie++; }

       if(nm->is_unloaded()) { nmethodUnloaded++; }

       if(nm->is_native_method()) { nmethodNative++; }

       if(nm->method() != NULL && nm->is_java_method()) {

         nmethodJava++;

         if (nm->insts_size() > maxCodeSize) {

           maxCodeSize = nm->insts_size();

         }

       }

     } else if (cb->is_runtime_stub()) {

       runtimeStubCount++;

     } else if (cb->is_deoptimization_stub()) {

       deoptimizationStubCount++;

     } else if (cb->is_uncommon_trap_stub()) {

       uncommonTrapStubCount++;

     } else if (cb->is_adapter_blob()) {

       adapterCount++;

     } else if (cb->is_buffer_blob()) {

       bufferBlobCount++;

     }

   }

   int bucketSize = 512;

   int bucketLimit = maxCodeSize / bucketSize + 1;

   int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);

   memset(buckets,0,sizeof(int) * bucketLimit);

   for (cb = first(); cb != NULL; cb = next(cb)) {

     if (cb->is_nmethod()) {

       nmethod* nm = (nmethod*)cb;

       if(nm->is_java_method()) {

         buckets[nm->insts_size() / bucketSize]++;

       }

     }

   }

   tty->print_cr("Code Cache Entries (total of %d)",total);

   tty->print_cr("-------------------------------------------------");

   tty->print_cr("nmethods: %d",nmethodCount);

   tty->print_cr("\talive: %d",nmethodAlive);

   tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);

   tty->print_cr("\tzombie: %d",nmethodZombie);

   tty->print_cr("\tunloaded: %d",nmethodUnloaded);

   tty->print_cr("\tjava: %d",nmethodJava);

   tty->print_cr("\tnative: %d",nmethodNative);

   tty->print_cr("runtime_stubs: %d",runtimeStubCount);

   tty->print_cr("adapters: %d",adapterCount);

   tty->print_cr("buffer blobs: %d",bufferBlobCount);

   tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);

   tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);

   tty->print_cr("\nnmethod size distribution (non-zombie java)");

   tty->print_cr("-------------------------------------------------");

   for(int i=0; i<bucketLimit; i++) {

     if(buckets[i] != 0) {

       tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);

       tty->fill_to(40);

       tty->print_cr("%d",buckets[i]);

     }

   }

   FREE_C_HEAP_ARRAY(int, buckets, mtCode);

 }

 #endif // !PRODUCT

 void CodeCache::print() {

   print_summary(tty);

 #ifndef PRODUCT

   if (!Verbose) return;

   CodeBlob_sizes live;

   CodeBlob_sizes dead;

   FOR_ALL_BLOBS(p) {

     if (!p->is_alive()) {

       dead.add(p);

     } else {

       live.add(p);

     }

   }

   tty->print_cr("CodeCache:");

   tty->print_cr("nmethod dependency checking time %f", dependentCheckTime.seconds(),

                 dependentCheckTime.seconds() / dependentCheckCount);

   if (!live.is_empty()) {

     live.print("live");

   }

   if (!dead.is_empty()) {

     dead.print("dead");

   }

   if (WizardMode) {

      // print the oop_map usage

     int code_size = 0;

     int number_of_blobs = 0;

     int number_of_oop_maps = 0;

     int map_size = 0;

     FOR_ALL_BLOBS(p) {

       if (p->is_alive()) {

         number_of_blobs++;

         code_size += p->code_size();

         OopMapSet* set = p->oop_maps();

         if (set != NULL) {

           number_of_oop_maps += set->size();

           map_size           += set->heap_size();

         }

       }

     }

     tty->print_cr("OopMaps");

     tty->print_cr("  #blobs    = %d", number_of_blobs);

     tty->print_cr("  code size = %d", code_size);

     tty->print_cr("  #oop_maps = %d", number_of_oop_maps);

     tty->print_cr("  map size  = %d", map_size);

   }

 #endif // !PRODUCT

 }

 void CodeCache::print_summary(outputStream* st, bool detailed) {

   size_t total = (_heap->high_boundary() - _heap->low_boundary());

   st->print_cr("CodeCache: size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT

                "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",

                total/K, (total - unallocated_capacity())/K,

                maxCodeCacheUsed/K, unallocated_capacity()/K);

   if (detailed) {

     st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",

                  _heap->low_boundary(),

                  _heap->high(),

                  _heap->high_boundary());

     st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT

                  " adapters=" UINT32_FORMAT,

                  nof_blobs(), nof_nmethods(), nof_adapters());

     st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ?

                  "enabled" : Arguments::mode() == Arguments::_int ?

                  "disabled (interpreter mode)" :

                  "disabled (not enough contiguous free space left)");

   }

 }

 void CodeCache::log_state(outputStream* st) {

   st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"

             " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",

             nof_blobs(), nof_nmethods(), nof_adapters(),

             unallocated_capacity());

 }