jdk8-mips64-public/hotspot: src/share/vm/runtime/vm_operations.hpp@8e875c964f41 (annotated)

src/share/vm/runtime/vm_operations.hpp@8e875c964f41 (annotated)

src/share/vm/runtime/vm_operations.hpp

Wed, 09 Oct 2019 16:11:58 +0800

author: ddong
date: Wed, 09 Oct 2019 16:11:58 +0800
changeset 9885: 8e875c964f41
parent 9063: 777ace6655eb
child 9931: fd44df5e3bc3
permissions: -rw-r--r--

8214542: JFR: Old Object Sample event slow on a deep heap in debug builds
Reviewed-by: egahlin, rwestberg

 /*
  * Copyright (c) 1997, 2017, 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.
  *
  */
 #ifndef SHARE_VM_RUNTIME_VM_OPERATIONS_HPP
 #define SHARE_VM_RUNTIME_VM_OPERATIONS_HPP
 #include "classfile/javaClasses.hpp"
 #include "memory/allocation.hpp"
 #include "oops/oop.hpp"
 #include "runtime/thread.hpp"
 #include "utilities/top.hpp"
 // The following classes are used for operations
 // initiated by a Java thread but that must
 // take place in the VMThread.
 #define VM_OP_ENUM(type)   VMOp_##type,
 // Note: When new VM_XXX comes up, add 'XXX' to the template table.
 #define VM_OPS_DO(template)                       \
   template(Dummy)                                 \
   template(ThreadStop)                            \
   template(ThreadDump)                            \
   template(PrintThreads)                          \
   template(FindDeadlocks)                         \
   template(ForceSafepoint)                        \
   template(ForceAsyncSafepoint)                   \
   template(Deoptimize)                            \
   template(DeoptimizeFrame)                       \
   template(DeoptimizeAll)                         \
   template(ZombieAll)                             \
   template(UnlinkSymbols)                         \
   template(Verify)                                \
   template(PrintJNI)                              \
   template(HeapDumper)                            \
   template(DeoptimizeTheWorld)                    \
   template(CollectForMetadataAllocation)          \
   template(GC_HeapInspection)                     \
   template(GenCollectFull)                        \
   template(GenCollectFullConcurrent)              \
   template(GenCollectForAllocation)               \
   template(ParallelGCFailedAllocation)            \
   template(ParallelGCSystemGC)                    \
   template(CGC_Operation)                         \
   template(CMS_Initial_Mark)                      \
   template(CMS_Final_Remark)                      \
   template(G1CollectFull)                         \
   template(G1CollectForAllocation)                \
   template(G1IncCollectionPause)                  \
   template(DestroyAllocationContext)              \
   template(EnableBiasedLocking)                   \
   template(RevokeBias)                            \
   template(BulkRevokeBias)                        \
   template(PopulateDumpSharedSpace)               \
   template(JNIFunctionTableCopier)                \
   template(RedefineClasses)                       \
   template(GetOwnedMonitorInfo)                   \
   template(GetObjectMonitorUsage)                 \
   template(GetCurrentContendedMonitor)            \
   template(GetStackTrace)                         \
   template(GetMultipleStackTraces)                \
   template(GetAllStackTraces)                     \
   template(GetThreadListStackTraces)              \
   template(GetFrameCount)                         \
   template(GetFrameLocation)                      \
   template(ChangeBreakpoints)                     \
   template(GetOrSetLocal)                         \
   template(GetCurrentLocation)                    \
   template(EnterInterpOnlyMode)                   \
   template(ChangeSingleStep)                      \
   template(HeapWalkOperation)                     \
   template(HeapIterateOperation)                  \
   template(ReportJavaOutOfMemory)                 \
   template(JFRCheckpoint)                         \
   template(Exit)                                  \
   template(LinuxDllLoad)                          \
   template(RotateGCLog)                           \
   template(WhiteBoxOperation)                     \
   template(ClassLoaderStatsOperation)             \
   template(JFROldObject)                          \
 class VM_Operation: public CHeapObj<mtInternal> {
  public:
   enum Mode {
     _safepoint,       // blocking,        safepoint, vm_op C-heap allocated
     _no_safepoint,    // blocking,     no safepoint, vm_op C-Heap allocated
     _concurrent,      // non-blocking, no safepoint, vm_op C-Heap allocated
     _async_safepoint  // non-blocking,    safepoint, vm_op C-Heap allocated
   };
   enum VMOp_Type {
     VM_OPS_DO(VM_OP_ENUM)
     VMOp_Terminating
   };
  private:
   Thread*         _calling_thread;
   ThreadPriority  _priority;
   long            _timestamp;
   VM_Operation*   _next;
   VM_Operation*   _prev;
   // The VM operation name array
   static const char* _names[];
  public:
   VM_Operation()  { _calling_thread = NULL; _next = NULL; _prev = NULL; }
   virtual ~VM_Operation() {}
   // VM operation support (used by VM thread)
   Thread* calling_thread() const                 { return _calling_thread; }
   ThreadPriority priority()                      { return _priority; }
   void set_calling_thread(Thread* thread, ThreadPriority priority);
   long timestamp() const              { return _timestamp; }
   void set_timestamp(long timestamp)  { _timestamp = timestamp; }
   // Called by VM thread - does in turn invoke doit(). Do not override this
   void evaluate();
   // evaluate() is called by the VMThread and in turn calls doit().
   // If the thread invoking VMThread::execute((VM_Operation*) is a JavaThread,
   // doit_prologue() is called in that thread before transferring control to
   // the VMThread.
   // If doit_prologue() returns true the VM operation will proceed, and
   // doit_epilogue() will be called by the JavaThread once the VM operation
   // completes. If doit_prologue() returns false the VM operation is cancelled.
   virtual void doit()                            = 0;
   virtual bool doit_prologue()                   { return true; };
   virtual void doit_epilogue()                   {}; // Note: Not called if mode is: _concurrent
   // Type test
   virtual bool is_methodCompiler() const         { return false; }
   // Linking
   VM_Operation *next() const                     { return _next; }
   VM_Operation *prev() const                     { return _prev; }
   void set_next(VM_Operation *next)              { _next = next; }
   void set_prev(VM_Operation *prev)              { _prev = prev; }
   // Configuration. Override these appropriatly in subclasses.
   virtual VMOp_Type type() const = 0;
   virtual Mode evaluation_mode() const            { return _safepoint; }
   virtual bool allow_nested_vm_operations() const { return false; }
   virtual bool is_cheap_allocated() const         { return false; }
   virtual void oops_do(OopClosure* f)              { /* do nothing */ };
   // CAUTION: <don't hang yourself with following rope>
   // If you override these methods, make sure that the evaluation
   // of these methods is race-free and non-blocking, since these
   // methods may be evaluated either by the mutators or by the
   // vm thread, either concurrently with mutators or with the mutators
   // stopped. In other words, taking locks is verboten, and if there
   // are any races in evaluating the conditions, they'd better be benign.
   virtual bool evaluate_at_safepoint() const {
     return evaluation_mode() == _safepoint  ||
            evaluation_mode() == _async_safepoint;
   }
   virtual bool evaluate_concurrently() const {
     return evaluation_mode() == _concurrent ||
            evaluation_mode() == _async_safepoint;
   }
   static const char* mode_to_string(Mode mode);
   // Debugging
   virtual void print_on_error(outputStream* st) const;
   const char* name() const { return _names[type()]; }
   static const char* name(int type) {
     assert(type >= 0 && type < VMOp_Terminating, "invalid VM operation type");
     return _names[type];
   }
 #ifndef PRODUCT
   void print_on(outputStream* st) const { print_on_error(st); }
 #endif
 };
 class VM_ThreadStop: public VM_Operation {
  private:
   oop     _thread;        // The Thread that the Throwable is thrown against
   oop     _throwable;     // The Throwable thrown at the target Thread
  public:
   // All oops are passed as JNI handles, since there is no guarantee that a GC might happen before the
   // VM operation is executed.
   VM_ThreadStop(oop thread, oop throwable) {
     _thread    = thread;
     _throwable = throwable;
   }
   VMOp_Type type() const                         { return VMOp_ThreadStop; }
   oop target_thread() const                      { return _thread; }
   oop throwable() const                          { return _throwable;}
   void doit();
   // We deoptimize if top-most frame is compiled - this might require a C2I adapter to be generated
   bool allow_nested_vm_operations() const        { return true; }
   Mode evaluation_mode() const                   { return _async_safepoint; }
   bool is_cheap_allocated() const                { return true; }
   // GC support
   void oops_do(OopClosure* f) {
     f->do_oop(&_thread); f->do_oop(&_throwable);
   }
 };
 // dummy vm op, evaluated just to force a safepoint
 class VM_ForceSafepoint: public VM_Operation {
  public:
   VM_ForceSafepoint() {}
   void doit()         {}
   VMOp_Type type() const { return VMOp_ForceSafepoint; }
 };
 // dummy vm op, evaluated just to force a safepoint
 class VM_ForceAsyncSafepoint: public VM_Operation {
  public:
   VM_ForceAsyncSafepoint() {}
   void doit()              {}
   VMOp_Type type() const                         { return VMOp_ForceAsyncSafepoint; }
   Mode evaluation_mode() const                   { return _async_safepoint; }
   bool is_cheap_allocated() const                { return true; }
 };
 class VM_Deoptimize: public VM_Operation {
  public:
   VM_Deoptimize() {}
   VMOp_Type type() const                        { return VMOp_Deoptimize; }
   void doit();
   bool allow_nested_vm_operations() const        { return true; }
 };
 // Deopt helper that can deoptimize frames in threads other than the
 // current thread.  Only used through Deoptimization::deoptimize_frame.
 class VM_DeoptimizeFrame: public VM_Operation {
   friend class Deoptimization;
  private:
   JavaThread* _thread;
   intptr_t*   _id;
   VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id);
  public:
   VMOp_Type type() const                         { return VMOp_DeoptimizeFrame; }
   void doit();
   bool allow_nested_vm_operations() const        { return true;  }
 };
 #ifndef PRODUCT
 class VM_DeoptimizeAll: public VM_Operation {
  private:
   KlassHandle _dependee;
  public:
   VM_DeoptimizeAll() {}
   VMOp_Type type() const                         { return VMOp_DeoptimizeAll; }
   void doit();
   bool allow_nested_vm_operations() const        { return true; }
 };
 class VM_ZombieAll: public VM_Operation {
  public:
   VM_ZombieAll() {}
   VMOp_Type type() const                         { return VMOp_ZombieAll; }
   void doit();
   bool allow_nested_vm_operations() const        { return true; }
 };
 #endif // PRODUCT
 class VM_UnlinkSymbols: public VM_Operation {
  public:
   VM_UnlinkSymbols() {}
   VMOp_Type type() const                         { return VMOp_UnlinkSymbols; }
   void doit();
   bool allow_nested_vm_operations() const        { return true; }
 };
 class VM_Verify: public VM_Operation {
  private:
   bool _silent;
  public:
   VM_Verify(bool silent = VerifySilently) : _silent(silent) {}
   VMOp_Type type() const { return VMOp_Verify; }
   void doit();
 };
 class VM_PrintThreads: public VM_Operation {
  private:
   outputStream* _out;
   bool _print_concurrent_locks;
  public:
   VM_PrintThreads()                                                { _out = tty; _print_concurrent_locks = PrintConcurrentLocks; }
   VM_PrintThreads(outputStream* out, bool print_concurrent_locks)  { _out = out; _print_concurrent_locks = print_concurrent_locks; }
   VMOp_Type type() const                                           {  return VMOp_PrintThreads; }
   void doit();
   bool doit_prologue();
   void doit_epilogue();
 };
 class VM_PrintJNI: public VM_Operation {
  private:
   outputStream* _out;
  public:
   VM_PrintJNI()                         { _out = tty; }
   VM_PrintJNI(outputStream* out)        { _out = out; }
   VMOp_Type type() const                { return VMOp_PrintJNI; }
   void doit();
 };
 class DeadlockCycle;
 class VM_FindDeadlocks: public VM_Operation {
  private:
   bool           _concurrent_locks;
   DeadlockCycle* _deadlocks;
   outputStream*  _out;
  public:
   VM_FindDeadlocks(bool concurrent_locks) :  _concurrent_locks(concurrent_locks), _out(NULL), _deadlocks(NULL) {};
   VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _out(st), _deadlocks(NULL) {};
   ~VM_FindDeadlocks();
   DeadlockCycle* result()      { return _deadlocks; };
   VMOp_Type type() const       { return VMOp_FindDeadlocks; }
   void doit();
   bool doit_prologue();
 };
 class ThreadDumpResult;
 class ThreadSnapshot;
 class ThreadConcurrentLocks;
 class VM_ThreadDump : public VM_Operation {
  private:
   ThreadDumpResult*              _result;
   int                            _num_threads;
   GrowableArray<instanceHandle>* _threads;
   int                            _max_depth;
   bool                           _with_locked_monitors;
   bool                           _with_locked_synchronizers;
   ThreadSnapshot* snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl);
  public:
   VM_ThreadDump(ThreadDumpResult* result,
                 int max_depth,  // -1 indicates entire stack
                 bool with_locked_monitors,
                 bool with_locked_synchronizers);
   VM_ThreadDump(ThreadDumpResult* result,
                 GrowableArray<instanceHandle>* threads,
                 int num_threads, // -1 indicates entire stack
                 int max_depth,
                 bool with_locked_monitors,
                 bool with_locked_synchronizers);
   VMOp_Type type() const { return VMOp_ThreadDump; }
   void doit();
   bool doit_prologue();
   void doit_epilogue();
 };
 class VM_Exit: public VM_Operation {
  private:
   int  _exit_code;
   static volatile bool _vm_exited;
   static Thread * _shutdown_thread;
   static void wait_if_vm_exited();
  public:
   VM_Exit(int exit_code) {
     _exit_code = exit_code;
   }
   static int wait_for_threads_in_native_to_block();
   static int set_vm_exited();
   static bool vm_exited()                      { return _vm_exited; }
   static void block_if_vm_exited() {
     if (_vm_exited) {
       wait_if_vm_exited();
     }
   }
   VMOp_Type type() const { return VMOp_Exit; }
   void doit();
 };
 class VM_RotateGCLog: public VM_Operation {
  private:
   outputStream* _out;
  public:
   VM_RotateGCLog(outputStream* st) : _out(st) {}
   VMOp_Type type() const { return VMOp_RotateGCLog; }
   void doit() { gclog_or_tty->rotate_log(true, _out); }
 };
 #endif // SHARE_VM_RUNTIME_VM_OPERATIONS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/vm_operations.hpp@8e875c964f41 (annotated)

src/share/vm/runtime/vm_operations.hpp