hotspot/src/share/vm/runtime/vm_operations.hpp
author sjohanss
Fri, 05 Sep 2014 09:49:19 +0200
changeset 26837 72a43d3841e7
parent 26587 e8b28fa936af
child 27420 04e6f914cce1
permissions -rw-r--r--
8057536: Refactor G1 to allow context specific allocations Summary: Splitting out a g1 allocator class to simply specialized allocators which can associate each allocation with a given context. Reviewed-by: mgerdin, brutisso
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/*
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 * Copyright (c) 1997, 2014, 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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#ifndef SHARE_VM_RUNTIME_VM_OPERATIONS_HPP
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#define SHARE_VM_RUNTIME_VM_OPERATIONS_HPP
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#include "classfile/javaClasses.hpp"
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#include "memory/allocation.hpp"
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#include "oops/oop.hpp"
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#include "runtime/thread.hpp"
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#include "utilities/top.hpp"
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// The following classes are used for operations
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// initiated by a Java thread but that must
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// take place in the VMThread.
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#define VM_OP_ENUM(type)   VMOp_##type,
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// Note: When new VM_XXX comes up, add 'XXX' to the template table.
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#define VM_OPS_DO(template)                       \
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  template(Dummy)                                 \
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  template(ThreadStop)                            \
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  template(ThreadDump)                            \
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  template(PrintThreads)                          \
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  template(FindDeadlocks)                         \
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  template(ForceSafepoint)                        \
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  template(ForceAsyncSafepoint)                   \
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  template(Deoptimize)                            \
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  template(DeoptimizeFrame)                       \
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  template(DeoptimizeAll)                         \
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  template(ZombieAll)                             \
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  template(UnlinkSymbols)                         \
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  template(Verify)                                \
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  template(PrintJNI)                              \
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  template(HeapDumper)                            \
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  template(DeoptimizeTheWorld)                    \
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  template(CollectForMetadataAllocation)          \
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  template(GC_HeapInspection)                     \
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  template(GenCollectFull)                        \
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  template(GenCollectFullConcurrent)              \
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  template(GenCollectForAllocation)               \
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  template(ParallelGCFailedAllocation)            \
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  template(ParallelGCSystemGC)                    \
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  template(CGC_Operation)                         \
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  template(CMS_Initial_Mark)                      \
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  template(CMS_Final_Remark)                      \
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  template(G1CollectFull)                         \
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  template(G1CollectForAllocation)                \
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  template(G1IncCollectionPause)                  \
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  template(DestroyAllocationContext)              \
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  template(EnableBiasedLocking)                   \
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  template(RevokeBias)                            \
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  template(BulkRevokeBias)                        \
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  template(PopulateDumpSharedSpace)               \
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  template(JNIFunctionTableCopier)                \
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  template(RedefineClasses)                       \
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  template(UpdateForPopTopFrame)                  \
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  template(SetFramePop)                           \
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  template(GetOwnedMonitorInfo)                   \
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  template(GetObjectMonitorUsage)                 \
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  template(GetCurrentContendedMonitor)            \
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  template(GetStackTrace)                         \
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  template(GetMultipleStackTraces)                \
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  template(GetAllStackTraces)                     \
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  template(GetThreadListStackTraces)              \
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  template(GetFrameCount)                         \
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  template(GetFrameLocation)                      \
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  template(ChangeBreakpoints)                     \
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  template(GetOrSetLocal)                         \
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  template(GetCurrentLocation)                    \
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  template(EnterInterpOnlyMode)                   \
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  template(ChangeSingleStep)                      \
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  template(HeapWalkOperation)                     \
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  template(HeapIterateOperation)                  \
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  template(ReportJavaOutOfMemory)                 \
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  template(JFRCheckpoint)                         \
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  template(Exit)                                  \
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  template(LinuxDllLoad)                          \
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  template(RotateGCLog)                           \
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  template(WhiteBoxOperation)                     \
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  template(ClassLoaderStatsOperation)             \
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  template(PrintCompileQueue)                     \
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  template(PrintCodeList)                         \
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  template(PrintCodeCache)                        \
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class VM_Operation: public CHeapObj<mtInternal> {
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  enum Mode {
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    _safepoint,       // blocking,        safepoint, vm_op C-heap allocated
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    _no_safepoint,    // blocking,     no safepoint, vm_op C-Heap allocated
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    _concurrent,      // non-blocking, no safepoint, vm_op C-Heap allocated
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    _async_safepoint  // non-blocking,    safepoint, vm_op C-Heap allocated
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  };
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  enum VMOp_Type {
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    VM_OPS_DO(VM_OP_ENUM)
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    VMOp_Terminating
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  };
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  Thread*         _calling_thread;
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  ThreadPriority  _priority;
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  long            _timestamp;
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  VM_Operation*   _next;
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  VM_Operation*   _prev;
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  // The VM operation name array
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  static const char* _names[];
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  VM_Operation()  { _calling_thread = NULL; _next = NULL; _prev = NULL; }
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  virtual ~VM_Operation() {}
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  // VM operation support (used by VM thread)
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  Thread* calling_thread() const                 { return _calling_thread; }
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  ThreadPriority priority()                      { return _priority; }
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  void set_calling_thread(Thread* thread, ThreadPriority priority);
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  long timestamp() const              { return _timestamp; }
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  void set_timestamp(long timestamp)  { _timestamp = timestamp; }
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  // Called by VM thread - does in turn invoke doit(). Do not override this
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  void evaluate();
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  // evaluate() is called by the VMThread and in turn calls doit().
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  // If the thread invoking VMThread::execute((VM_Operation*) is a JavaThread,
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  // doit_prologue() is called in that thread before transferring control to
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  // the VMThread.
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  // If doit_prologue() returns true the VM operation will proceed, and
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  // doit_epilogue() will be called by the JavaThread once the VM operation
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  // completes. If doit_prologue() returns false the VM operation is cancelled.
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  virtual void doit()                            = 0;
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  virtual bool doit_prologue()                   { return true; };
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  virtual void doit_epilogue()                   {}; // Note: Not called if mode is: _concurrent
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  // Type test
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  virtual bool is_methodCompiler() const         { return false; }
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  // Linking
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  VM_Operation *next() const                     { return _next; }
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  VM_Operation *prev() const                     { return _prev; }
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  void set_next(VM_Operation *next)              { _next = next; }
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  void set_prev(VM_Operation *prev)              { _prev = prev; }
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  // Configuration. Override these appropriately in subclasses.
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  virtual VMOp_Type type() const = 0;
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  virtual Mode evaluation_mode() const            { return _safepoint; }
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  virtual bool allow_nested_vm_operations() const { return false; }
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  virtual bool is_cheap_allocated() const         { return false; }
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  virtual void oops_do(OopClosure* f)              { /* do nothing */ };
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  // CAUTION: <don't hang yourself with following rope>
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  // If you override these methods, make sure that the evaluation
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  // of these methods is race-free and non-blocking, since these
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  // methods may be evaluated either by the mutators or by the
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  // vm thread, either concurrently with mutators or with the mutators
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  // stopped. In other words, taking locks is verboten, and if there
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  // are any races in evaluating the conditions, they'd better be benign.
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  virtual bool evaluate_at_safepoint() const {
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    return evaluation_mode() == _safepoint  ||
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           evaluation_mode() == _async_safepoint;
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  }
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  virtual bool evaluate_concurrently() const {
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    return evaluation_mode() == _concurrent ||
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           evaluation_mode() == _async_safepoint;
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  }
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  static const char* mode_to_string(Mode mode);
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  // Debugging
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  void print_on_error(outputStream* st) const;
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  const char* name() const { return _names[type()]; }
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  static const char* name(int type) {
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    assert(type >= 0 && type < VMOp_Terminating, "invalid VM operation type");
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    return _names[type];
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  }
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#ifndef PRODUCT
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  void print_on(outputStream* st) const { print_on_error(st); }
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#endif
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};
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class VM_ThreadStop: public VM_Operation {
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  oop     _thread;        // The Thread that the Throwable is thrown against
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  oop     _throwable;     // The Throwable thrown at the target Thread
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  // All oops are passed as JNI handles, since there is no guarantee that a GC might happen before the
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  // VM operation is executed.
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  VM_ThreadStop(oop thread, oop throwable) {
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    _thread    = thread;
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    _throwable = throwable;
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  }
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  VMOp_Type type() const                         { return VMOp_ThreadStop; }
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  oop target_thread() const                      { return _thread; }
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  oop throwable() const                          { return _throwable;}
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  void doit();
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  // We deoptimize if top-most frame is compiled - this might require a C2I adapter to be generated
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  bool allow_nested_vm_operations() const        { return true; }
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  Mode evaluation_mode() const                   { return _async_safepoint; }
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  bool is_cheap_allocated() const                { return true; }
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  // GC support
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  void oops_do(OopClosure* f) {
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    f->do_oop(&_thread); f->do_oop(&_throwable);
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  }
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};
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// dummy vm op, evaluated just to force a safepoint
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class VM_ForceSafepoint: public VM_Operation {
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  VM_ForceSafepoint() {}
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  void doit()         {}
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  VMOp_Type type() const { return VMOp_ForceSafepoint; }
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};
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// dummy vm op, evaluated just to force a safepoint
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class VM_ForceAsyncSafepoint: public VM_Operation {
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  VM_ForceAsyncSafepoint() {}
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  void doit()              {}
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  VMOp_Type type() const                         { return VMOp_ForceAsyncSafepoint; }
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  Mode evaluation_mode() const                   { return _async_safepoint; }
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  bool is_cheap_allocated() const                { return true; }
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};
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class VM_Deoptimize: public VM_Operation {
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  VM_Deoptimize() {}
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  VMOp_Type type() const                        { return VMOp_Deoptimize; }
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  void doit();
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  bool allow_nested_vm_operations() const        { return true; }
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};
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// Deopt helper that can deoptimize frames in threads other than the
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// current thread.  Only used through Deoptimization::deoptimize_frame.
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class VM_DeoptimizeFrame: public VM_Operation {
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  friend class Deoptimization;
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  JavaThread* _thread;
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  intptr_t*   _id;
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  VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id);
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  VMOp_Type type() const                         { return VMOp_DeoptimizeFrame; }
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  void doit();
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  bool allow_nested_vm_operations() const        { return true;  }
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};
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#ifndef PRODUCT
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class VM_DeoptimizeAll: public VM_Operation {
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  KlassHandle _dependee;
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  VM_DeoptimizeAll() {}
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  VMOp_Type type() const                         { return VMOp_DeoptimizeAll; }
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  void doit();
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  bool allow_nested_vm_operations() const        { return true; }
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};
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class VM_ZombieAll: public VM_Operation {
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  VM_ZombieAll() {}
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  VMOp_Type type() const                         { return VMOp_ZombieAll; }
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  void doit();
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  bool allow_nested_vm_operations() const        { return true; }
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};
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#endif // PRODUCT
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class VM_UnlinkSymbols: public VM_Operation {
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  VM_UnlinkSymbols() {}
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  VMOp_Type type() const                         { return VMOp_UnlinkSymbols; }
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  void doit();
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  bool allow_nested_vm_operations() const        { return true; }
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};
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class VM_Verify: public VM_Operation {
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  bool _silent;
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  VM_Verify(bool silent = VerifySilently) : _silent(silent) {}
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  VMOp_Type type() const { return VMOp_Verify; }
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  void doit();
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};
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class VM_PrintThreads: public VM_Operation {
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  outputStream* _out;
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  bool _print_concurrent_locks;
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  VM_PrintThreads()                                                { _out = tty; _print_concurrent_locks = PrintConcurrentLocks; }
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  VM_PrintThreads(outputStream* out, bool print_concurrent_locks)  { _out = out; _print_concurrent_locks = print_concurrent_locks; }
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  VMOp_Type type() const                                           {  return VMOp_PrintThreads; }
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  void doit();
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  bool doit_prologue();
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  void doit_epilogue();
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};
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class VM_PrintJNI: public VM_Operation {
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  outputStream* _out;
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  VM_PrintJNI()                         { _out = tty; }
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  VM_PrintJNI(outputStream* out)        { _out = out; }
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  VMOp_Type type() const                { return VMOp_PrintJNI; }
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  void doit();
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};
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class DeadlockCycle;
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class VM_FindDeadlocks: public VM_Operation {
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  bool           _concurrent_locks;
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  DeadlockCycle* _deadlocks;
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  outputStream*  _out;
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  VM_FindDeadlocks(bool concurrent_locks) :  _concurrent_locks(concurrent_locks), _out(NULL), _deadlocks(NULL) {};
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  VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _out(st), _deadlocks(NULL) {};
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  ~VM_FindDeadlocks();
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  DeadlockCycle* result()      { return _deadlocks; };
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  VMOp_Type type() const       { return VMOp_FindDeadlocks; }
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  void doit();
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  bool doit_prologue();
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};
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class ThreadDumpResult;
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class ThreadSnapshot;
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class ThreadConcurrentLocks;
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class VM_ThreadDump : public VM_Operation {
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  ThreadDumpResult*              _result;
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  int                            _num_threads;
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  GrowableArray<instanceHandle>* _threads;
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  int                            _max_depth;
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  bool                           _with_locked_monitors;
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  bool                           _with_locked_synchronizers;
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  ThreadSnapshot* snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl);
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  VM_ThreadDump(ThreadDumpResult* result,
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                int max_depth,  // -1 indicates entire stack
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                bool with_locked_monitors,
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                bool with_locked_synchronizers);
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  VM_ThreadDump(ThreadDumpResult* result,
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                GrowableArray<instanceHandle>* threads,
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                int num_threads, // -1 indicates entire stack
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                int max_depth,
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                bool with_locked_monitors,
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                bool with_locked_synchronizers);
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  VMOp_Type type() const { return VMOp_ThreadDump; }
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  void doit();
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  bool doit_prologue();
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  void doit_epilogue();
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};
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class VM_Exit: public VM_Operation {
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  int  _exit_code;
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  static volatile bool _vm_exited;
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  static Thread * _shutdown_thread;
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  static void wait_if_vm_exited();
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  VM_Exit(int exit_code) {
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    _exit_code = exit_code;
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  }
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  static int wait_for_threads_in_native_to_block();
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  static int set_vm_exited();
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  static bool vm_exited()                      { return _vm_exited; }
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  static void block_if_vm_exited() {
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    if (_vm_exited) {
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      wait_if_vm_exited();
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    }
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  }
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  VMOp_Type type() const { return VMOp_Exit; }
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  void doit();
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};
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class VM_RotateGCLog: public VM_Operation {
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  outputStream* _out;
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  VM_RotateGCLog(outputStream* st) : _out(st) {}
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  VMOp_Type type() const { return VMOp_RotateGCLog; }
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  void doit() { gclog_or_tty->rotate_log(true, _out); }
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};
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class VM_PrintCompileQueue: public VM_Operation {
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  outputStream* _out;
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  VM_PrintCompileQueue(outputStream* st) : _out(st) {}
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  VMOp_Type type() const { return VMOp_PrintCompileQueue; }
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  void doit();
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};
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class VM_PrintCodeList: public VM_Operation {
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  outputStream* _out;
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  VM_PrintCodeList(outputStream* st) : _out(st) {}
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  VMOp_Type type() const { return VMOp_PrintCodeList; }
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  void doit();
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};
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class VM_PrintCodeCache: public VM_Operation {
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  outputStream* _out;
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  VM_PrintCodeCache(outputStream* st) : _out(st) {}
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  VMOp_Type type() const { return VMOp_PrintCodeCache; }
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  void doit();
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};
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#endif // SHARE_VM_RUNTIME_VM_OPERATIONS_HPP