author | kvn |
Wed, 29 Dec 2010 10:41:43 -0800 | |
changeset 7715 | 12998f95a334 |
parent 7397 | 5b173b4ca846 |
child 8076 | 96d498ec7ae1 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "precompiled.hpp" |
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#include "classfile/symbolTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "code/codeCache.hpp" |
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#include "gc_interface/collectedHeap.inline.hpp" |
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#include "memory/sharedHeap.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/fprofiler.hpp" |
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#include "runtime/java.hpp" |
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#include "services/management.hpp" |
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#include "utilities/copy.hpp" |
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#include "utilities/workgroup.hpp" |
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SharedHeap* SharedHeap::_sh; |
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// The set of potentially parallel tasks in strong root scanning. |
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enum SH_process_strong_roots_tasks { |
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SH_PS_Universe_oops_do, |
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SH_PS_JNIHandles_oops_do, |
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SH_PS_ObjectSynchronizer_oops_do, |
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SH_PS_FlatProfiler_oops_do, |
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SH_PS_Management_oops_do, |
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SH_PS_SystemDictionary_oops_do, |
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SH_PS_jvmti_oops_do, |
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SH_PS_vmSymbols_oops_do, |
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SH_PS_SymbolTable_oops_do, |
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SH_PS_StringTable_oops_do, |
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SH_PS_CodeCache_oops_do, |
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// Leave this one last. |
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SH_PS_NumElements |
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}; |
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||
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SharedHeap::SharedHeap(CollectorPolicy* policy_) : |
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CollectedHeap(), |
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_collector_policy(policy_), |
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_perm_gen(NULL), _rem_set(NULL), |
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_strong_roots_parity(0), |
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_process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), |
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_n_par_threads(0), |
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_workers(NULL) |
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{ |
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if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { |
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vm_exit_during_initialization("Failed necessary allocation."); |
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} |
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_sh = this; // ch is static, should be set only once. |
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if ((UseParNewGC || |
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(UseConcMarkSweepGC && CMSParallelRemarkEnabled) || |
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UseG1GC) && |
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ParallelGCThreads > 0) { |
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_workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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/* are_GC_task_threads */true, |
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/* are_ConcurrentGC_threads */false); |
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if (_workers == NULL) { |
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vm_exit_during_initialization("Failed necessary allocation."); |
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} else { |
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_workers->initialize_workers(); |
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} |
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} |
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} |
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||
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bool SharedHeap::heap_lock_held_for_gc() { |
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Thread* t = Thread::current(); |
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return Heap_lock->owned_by_self() |
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|| ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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&& _thread_holds_heap_lock_for_gc); |
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} |
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void SharedHeap::set_par_threads(int t) { |
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assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
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_n_par_threads = t; |
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_process_strong_tasks->set_n_threads(t); |
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} |
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class AssertIsPermClosure: public OopClosure { |
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public: |
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virtual void do_oop(oop* p) { |
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assert((*p) == NULL || (*p)->is_perm(), "Referent should be perm."); |
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} |
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virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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}; |
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static AssertIsPermClosure assert_is_perm_closure; |
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void SharedHeap::change_strong_roots_parity() { |
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// Also set the new collection parity. |
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assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, |
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"Not in range."); |
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_strong_roots_parity++; |
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if (_strong_roots_parity == 3) _strong_roots_parity = 1; |
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assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, |
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"Not in range."); |
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} |
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SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate) |
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: MarkScope(activate) |
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{ |
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if (_active) { |
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outer->change_strong_roots_parity(); |
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} |
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} |
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SharedHeap::StrongRootsScope::~StrongRootsScope() { |
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// nothing particular |
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} |
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void SharedHeap::process_strong_roots(bool activate_scope, |
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bool collecting_perm_gen, |
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ScanningOption so, |
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OopClosure* roots, |
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CodeBlobClosure* code_roots, |
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OopsInGenClosure* perm_blk) { |
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StrongRootsScope srs(this, activate_scope); |
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// General strong roots. |
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assert(_strong_roots_parity != 0, "must have called prologue code"); |
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if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
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Universe::oops_do(roots); |
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ReferenceProcessor::oops_do(roots); |
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// Consider perm-gen discovered lists to be strong. |
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perm_gen()->ref_processor()->weak_oops_do(roots); |
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} |
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// Global (strong) JNI handles |
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if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) |
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JNIHandles::oops_do(roots); |
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// All threads execute this; the individual threads are task groups. |
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if (ParallelGCThreads > 0) { |
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Threads::possibly_parallel_oops_do(roots, code_roots); |
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} else { |
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Threads::oops_do(roots, code_roots); |
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} |
153 |
if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) |
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ObjectSynchronizer::oops_do(roots); |
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if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) |
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FlatProfiler::oops_do(roots); |
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if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) |
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Management::oops_do(roots); |
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if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) |
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JvmtiExport::oops_do(roots); |
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if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { |
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if (so & SO_AllClasses) { |
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SystemDictionary::oops_do(roots); |
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} else |
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if (so & SO_SystemClasses) { |
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SystemDictionary::always_strong_oops_do(roots); |
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} |
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} |
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if (!_process_strong_tasks->is_task_claimed(SH_PS_SymbolTable_oops_do)) { |
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if (so & SO_Symbols) { |
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SymbolTable::oops_do(roots); |
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} |
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// Verify if the symbol table contents are in the perm gen |
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NOT_PRODUCT(SymbolTable::oops_do(&assert_is_perm_closure)); |
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} |
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if (!_process_strong_tasks->is_task_claimed(SH_PS_StringTable_oops_do)) { |
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if (so & SO_Strings) { |
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StringTable::oops_do(roots); |
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} |
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// Verify if the string table contents are in the perm gen |
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NOT_PRODUCT(StringTable::oops_do(&assert_is_perm_closure)); |
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} |
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if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { |
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if (so & SO_CodeCache) { |
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// (Currently, CMSCollector uses this to do intermediate-strength collections.) |
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assert(collecting_perm_gen, "scanning all of code cache"); |
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assert(code_roots != NULL, "must supply closure for code cache"); |
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if (code_roots != NULL) { |
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CodeCache::blobs_do(code_roots); |
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} |
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} else if (so & (SO_SystemClasses|SO_AllClasses)) { |
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if (!collecting_perm_gen) { |
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// If we are collecting from class statics, but we are not going to |
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// visit all of the CodeCache, collect from the non-perm roots if any. |
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// This makes the code cache function temporarily as a source of strong |
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// roots for oops, until the next major collection. |
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// |
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// If collecting_perm_gen is true, we require that this phase will call |
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// CodeCache::do_unloading. This will kill off nmethods with expired |
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// weak references, such as stale invokedynamic targets. |
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CodeCache::scavenge_root_nmethods_do(code_roots); |
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} |
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} |
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// Verify if the code cache contents are in the perm gen |
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NOT_PRODUCT(CodeBlobToOopClosure assert_code_is_perm(&assert_is_perm_closure, /*do_marking=*/ false)); |
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NOT_PRODUCT(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_perm)); |
1 | 211 |
} |
212 |
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213 |
// Roots that should point only into permanent generation. |
|
214 |
{ |
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215 |
OopClosure* blk = NULL; |
|
216 |
if (collecting_perm_gen) { |
|
217 |
blk = roots; |
|
218 |
} else { |
|
219 |
debug_only(blk = &assert_is_perm_closure); |
|
220 |
} |
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221 |
if (blk != NULL) { |
|
222 |
if (!_process_strong_tasks->is_task_claimed(SH_PS_vmSymbols_oops_do)) |
|
223 |
vmSymbols::oops_do(blk); |
|
224 |
} |
|
225 |
} |
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226 |
||
227 |
if (!collecting_perm_gen) { |
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// All threads perform this; coordination is handled internally. |
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229 |
||
230 |
rem_set()->younger_refs_iterate(perm_gen(), perm_blk); |
|
231 |
} |
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232 |
_process_strong_tasks->all_tasks_completed(); |
|
233 |
} |
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234 |
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235 |
class AlwaysTrueClosure: public BoolObjectClosure { |
|
236 |
public: |
|
237 |
void do_object(oop p) { ShouldNotReachHere(); } |
|
238 |
bool do_object_b(oop p) { return true; } |
|
239 |
}; |
|
240 |
static AlwaysTrueClosure always_true; |
|
241 |
||
242 |
class SkipAdjustingSharedStrings: public OopClosure { |
|
243 |
OopClosure* _clo; |
|
244 |
public: |
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245 |
SkipAdjustingSharedStrings(OopClosure* clo) : _clo(clo) {} |
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virtual void do_oop(oop* p) { |
1 | 248 |
oop o = (*p); |
249 |
if (!o->is_shared_readwrite()) { |
|
250 |
_clo->do_oop(p); |
|
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} |
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} |
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virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
1 | 254 |
}; |
255 |
||
256 |
// Unmarked shared Strings in the StringTable (which got there due to |
|
257 |
// being in the constant pools of as-yet unloaded shared classes) were |
|
258 |
// not marked and therefore did not have their mark words preserved. |
|
259 |
// These entries are also deliberately not purged from the string |
|
260 |
// table during unloading of unmarked strings. If an identity hash |
|
261 |
// code was computed for any of these objects, it will not have been |
|
262 |
// cleared to zero during the forwarding process or by the |
|
263 |
// RecursiveAdjustSharedObjectClosure, and will be confused by the |
|
264 |
// adjusting process as a forwarding pointer. We need to skip |
|
265 |
// forwarding StringTable entries which contain unmarked shared |
|
266 |
// Strings. Actually, since shared strings won't be moving, we can |
|
267 |
// just skip adjusting any shared entries in the string table. |
|
268 |
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269 |
void SharedHeap::process_weak_roots(OopClosure* root_closure, |
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changeset
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CodeBlobClosure* code_roots, |
1 | 271 |
OopClosure* non_root_closure) { |
272 |
// Global (weak) JNI handles |
|
273 |
JNIHandles::weak_oops_do(&always_true, root_closure); |
|
274 |
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changeset
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275 |
CodeCache::blobs_do(code_roots); |
1 | 276 |
SymbolTable::oops_do(root_closure); |
277 |
if (UseSharedSpaces && !DumpSharedSpaces) { |
|
278 |
SkipAdjustingSharedStrings skip_closure(root_closure); |
|
279 |
StringTable::oops_do(&skip_closure); |
|
280 |
} else { |
|
281 |
StringTable::oops_do(root_closure); |
|
282 |
} |
|
283 |
} |
|
284 |
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285 |
void SharedHeap::set_barrier_set(BarrierSet* bs) { |
|
286 |
_barrier_set = bs; |
|
287 |
// Cached barrier set for fast access in oops |
|
288 |
oopDesc::set_bs(bs); |
|
289 |
} |
|
290 |
||
291 |
void SharedHeap::post_initialize() { |
|
292 |
ref_processing_init(); |
|
293 |
} |
|
294 |
||
295 |
void SharedHeap::ref_processing_init() { |
|
296 |
perm_gen()->ref_processor_init(); |
|
297 |
} |
|
298 |
||
299 |
// Some utilities. |
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300 |
void SharedHeap::print_size_transition(outputStream* out, |
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301 |
size_t bytes_before, |
1 | 302 |
size_t bytes_after, |
303 |
size_t capacity) { |
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304 |
out->print(" %d%s->%d%s(%d%s)", |
1 | 305 |
byte_size_in_proper_unit(bytes_before), |
306 |
proper_unit_for_byte_size(bytes_before), |
|
307 |
byte_size_in_proper_unit(bytes_after), |
|
308 |
proper_unit_for_byte_size(bytes_after), |
|
309 |
byte_size_in_proper_unit(capacity), |
|
310 |
proper_unit_for_byte_size(capacity)); |
|
311 |
} |