aoqi@0: /*
poonam@8720:  * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_RUNTIME_VM_OPERATIONS_HPP
aoqi@0: #define SHARE_VM_RUNTIME_VM_OPERATIONS_HPP
aoqi@0: 
aoqi@0: #include "classfile/javaClasses.hpp"
aoqi@0: #include "memory/allocation.hpp"
aoqi@0: #include "oops/oop.hpp"
aoqi@0: #include "runtime/thread.hpp"
aoqi@0: #include "utilities/top.hpp"
aoqi@0: 
aoqi@0: // The following classes are used for operations
aoqi@0: // initiated by a Java thread but that must
aoqi@0: // take place in the VMThread.
aoqi@0: 
aoqi@0: #define VM_OP_ENUM(type)   VMOp_##type,
aoqi@0: 
aoqi@0: // Note: When new VM_XXX comes up, add 'XXX' to the template table.
aoqi@0: #define VM_OPS_DO(template)                       \
aoqi@0:   template(Dummy)                                 \
aoqi@0:   template(ThreadStop)                            \
aoqi@0:   template(ThreadDump)                            \
aoqi@0:   template(PrintThreads)                          \
aoqi@0:   template(FindDeadlocks)                         \
aoqi@0:   template(ForceSafepoint)                        \
aoqi@0:   template(ForceAsyncSafepoint)                   \
aoqi@0:   template(Deoptimize)                            \
aoqi@0:   template(DeoptimizeFrame)                       \
aoqi@0:   template(DeoptimizeAll)                         \
aoqi@0:   template(ZombieAll)                             \
aoqi@0:   template(UnlinkSymbols)                         \
aoqi@0:   template(Verify)                                \
aoqi@0:   template(PrintJNI)                              \
aoqi@0:   template(HeapDumper)                            \
aoqi@0:   template(DeoptimizeTheWorld)                    \
aoqi@0:   template(CollectForMetadataAllocation)          \
aoqi@0:   template(GC_HeapInspection)                     \
aoqi@0:   template(GenCollectFull)                        \
aoqi@0:   template(GenCollectFullConcurrent)              \
aoqi@0:   template(GenCollectForAllocation)               \
aoqi@0:   template(ParallelGCFailedAllocation)            \
aoqi@0:   template(ParallelGCSystemGC)                    \
aoqi@0:   template(CGC_Operation)                         \
aoqi@0:   template(CMS_Initial_Mark)                      \
aoqi@0:   template(CMS_Final_Remark)                      \
aoqi@0:   template(G1CollectFull)                         \
aoqi@0:   template(G1CollectForAllocation)                \
aoqi@0:   template(G1IncCollectionPause)                  \
sjohanss@7118:   template(DestroyAllocationContext)              \
aoqi@0:   template(EnableBiasedLocking)                   \
aoqi@0:   template(RevokeBias)                            \
aoqi@0:   template(BulkRevokeBias)                        \
aoqi@0:   template(PopulateDumpSharedSpace)               \
aoqi@0:   template(JNIFunctionTableCopier)                \
aoqi@0:   template(RedefineClasses)                       \
aoqi@0:   template(GetOwnedMonitorInfo)                   \
aoqi@0:   template(GetObjectMonitorUsage)                 \
aoqi@0:   template(GetCurrentContendedMonitor)            \
aoqi@0:   template(GetStackTrace)                         \
aoqi@0:   template(GetMultipleStackTraces)                \
aoqi@0:   template(GetAllStackTraces)                     \
aoqi@0:   template(GetThreadListStackTraces)              \
aoqi@0:   template(GetFrameCount)                         \
aoqi@0:   template(GetFrameLocation)                      \
aoqi@0:   template(ChangeBreakpoints)                     \
aoqi@0:   template(GetOrSetLocal)                         \
aoqi@0:   template(GetCurrentLocation)                    \
aoqi@0:   template(EnterInterpOnlyMode)                   \
aoqi@0:   template(ChangeSingleStep)                      \
aoqi@0:   template(HeapWalkOperation)                     \
aoqi@0:   template(HeapIterateOperation)                  \
aoqi@0:   template(ReportJavaOutOfMemory)                 \
aoqi@0:   template(JFRCheckpoint)                         \
aoqi@0:   template(Exit)                                  \
aoqi@0:   template(LinuxDllLoad)                          \
aoqi@0:   template(RotateGCLog)                           \
aoqi@0:   template(WhiteBoxOperation)                     \
dbuck@9063:   template(ClassLoaderStatsOperation)             \
aoqi@0: 
aoqi@0: class VM_Operation: public CHeapObj<mtInternal> {
aoqi@0:  public:
aoqi@0:   enum Mode {
aoqi@0:     _safepoint,       // blocking,        safepoint, vm_op C-heap allocated
aoqi@0:     _no_safepoint,    // blocking,     no safepoint, vm_op C-Heap allocated
aoqi@0:     _concurrent,      // non-blocking, no safepoint, vm_op C-Heap allocated
aoqi@0:     _async_safepoint  // non-blocking,    safepoint, vm_op C-Heap allocated
aoqi@0:   };
aoqi@0: 
aoqi@0:   enum VMOp_Type {
aoqi@0:     VM_OPS_DO(VM_OP_ENUM)
aoqi@0:     VMOp_Terminating
aoqi@0:   };
aoqi@0: 
aoqi@0:  private:
aoqi@0:   Thread*         _calling_thread;
aoqi@0:   ThreadPriority  _priority;
aoqi@0:   long            _timestamp;
aoqi@0:   VM_Operation*   _next;
aoqi@0:   VM_Operation*   _prev;
aoqi@0: 
aoqi@0:   // The VM operation name array
aoqi@0:   static const char* _names[];
aoqi@0: 
aoqi@0:  public:
aoqi@0:   VM_Operation()  { _calling_thread = NULL; _next = NULL; _prev = NULL; }
aoqi@0:   virtual ~VM_Operation() {}
aoqi@0: 
aoqi@0:   // VM operation support (used by VM thread)
aoqi@0:   Thread* calling_thread() const                 { return _calling_thread; }
aoqi@0:   ThreadPriority priority()                      { return _priority; }
aoqi@0:   void set_calling_thread(Thread* thread, ThreadPriority priority);
aoqi@0: 
aoqi@0:   long timestamp() const              { return _timestamp; }
aoqi@0:   void set_timestamp(long timestamp)  { _timestamp = timestamp; }
aoqi@0: 
aoqi@0:   // Called by VM thread - does in turn invoke doit(). Do not override this
aoqi@0:   void evaluate();
aoqi@0: 
aoqi@0:   // evaluate() is called by the VMThread and in turn calls doit().
aoqi@0:   // If the thread invoking VMThread::execute((VM_Operation*) is a JavaThread,
aoqi@0:   // doit_prologue() is called in that thread before transferring control to
aoqi@0:   // the VMThread.
aoqi@0:   // If doit_prologue() returns true the VM operation will proceed, and
aoqi@0:   // doit_epilogue() will be called by the JavaThread once the VM operation
aoqi@0:   // completes. If doit_prologue() returns false the VM operation is cancelled.
aoqi@0:   virtual void doit()                            = 0;
aoqi@0:   virtual bool doit_prologue()                   { return true; };
aoqi@0:   virtual void doit_epilogue()                   {}; // Note: Not called if mode is: _concurrent
aoqi@0: 
aoqi@0:   // Type test
aoqi@0:   virtual bool is_methodCompiler() const         { return false; }
aoqi@0: 
aoqi@0:   // Linking
aoqi@0:   VM_Operation *next() const                     { return _next; }
aoqi@0:   VM_Operation *prev() const                     { return _prev; }
aoqi@0:   void set_next(VM_Operation *next)              { _next = next; }
aoqi@0:   void set_prev(VM_Operation *prev)              { _prev = prev; }
aoqi@0: 
aoqi@0:   // Configuration. Override these appropriatly in subclasses.
aoqi@0:   virtual VMOp_Type type() const = 0;
aoqi@0:   virtual Mode evaluation_mode() const            { return _safepoint; }
aoqi@0:   virtual bool allow_nested_vm_operations() const { return false; }
aoqi@0:   virtual bool is_cheap_allocated() const         { return false; }
aoqi@0:   virtual void oops_do(OopClosure* f)              { /* do nothing */ };
aoqi@0: 
aoqi@0:   // CAUTION: <don't hang yourself with following rope>
aoqi@0:   // If you override these methods, make sure that the evaluation
aoqi@0:   // of these methods is race-free and non-blocking, since these
aoqi@0:   // methods may be evaluated either by the mutators or by the
aoqi@0:   // vm thread, either concurrently with mutators or with the mutators
aoqi@0:   // stopped. In other words, taking locks is verboten, and if there
aoqi@0:   // are any races in evaluating the conditions, they'd better be benign.
aoqi@0:   virtual bool evaluate_at_safepoint() const {
aoqi@0:     return evaluation_mode() == _safepoint  ||
aoqi@0:            evaluation_mode() == _async_safepoint;
aoqi@0:   }
aoqi@0:   virtual bool evaluate_concurrently() const {
aoqi@0:     return evaluation_mode() == _concurrent ||
aoqi@0:            evaluation_mode() == _async_safepoint;
aoqi@0:   }
aoqi@0: 
aoqi@0:   static const char* mode_to_string(Mode mode);
aoqi@0: 
aoqi@0:   // Debugging
poonam@8720:   virtual void print_on_error(outputStream* st) const;
aoqi@0:   const char* name() const { return _names[type()]; }
aoqi@0:   static const char* name(int type) {
aoqi@0:     assert(type >= 0 && type < VMOp_Terminating, "invalid VM operation type");
aoqi@0:     return _names[type];
aoqi@0:   }
aoqi@0: #ifndef PRODUCT
aoqi@0:   void print_on(outputStream* st) const { print_on_error(st); }
aoqi@0: #endif
aoqi@0: };
aoqi@0: 
aoqi@0: class VM_ThreadStop: public VM_Operation {
aoqi@0:  private:
aoqi@0:   oop     _thread;        // The Thread that the Throwable is thrown against
aoqi@0:   oop     _throwable;     // The Throwable thrown at the target Thread
aoqi@0:  public:
aoqi@0:   // All oops are passed as JNI handles, since there is no guarantee that a GC might happen before the
aoqi@0:   // VM operation is executed.
aoqi@0:   VM_ThreadStop(oop thread, oop throwable) {
aoqi@0:     _thread    = thread;
aoqi@0:     _throwable = throwable;
aoqi@0:   }
aoqi@0:   VMOp_Type type() const                         { return VMOp_ThreadStop; }
aoqi@0:   oop target_thread() const                      { return _thread; }
aoqi@0:   oop throwable() const                          { return _throwable;}
aoqi@0:   void doit();
aoqi@0:   // We deoptimize if top-most frame is compiled - this might require a C2I adapter to be generated
aoqi@0:   bool allow_nested_vm_operations() const        { return true; }
aoqi@0:   Mode evaluation_mode() const                   { return _async_safepoint; }
aoqi@0:   bool is_cheap_allocated() const                { return true; }
aoqi@0: 
aoqi@0:   // GC support
aoqi@0:   void oops_do(OopClosure* f) {
aoqi@0:     f->do_oop(&_thread); f->do_oop(&_throwable);
aoqi@0:   }
aoqi@0: };
aoqi@0: 
aoqi@0: // dummy vm op, evaluated just to force a safepoint
aoqi@0: class VM_ForceSafepoint: public VM_Operation {
aoqi@0:  public:
aoqi@0:   VM_ForceSafepoint() {}
aoqi@0:   void doit()         {}
aoqi@0:   VMOp_Type type() const { return VMOp_ForceSafepoint; }
aoqi@0: };
aoqi@0: 
aoqi@0: // dummy vm op, evaluated just to force a safepoint
aoqi@0: class VM_ForceAsyncSafepoint: public VM_Operation {
aoqi@0:  public:
aoqi@0:   VM_ForceAsyncSafepoint() {}
aoqi@0:   void doit()              {}
aoqi@0:   VMOp_Type type() const                         { return VMOp_ForceAsyncSafepoint; }
aoqi@0:   Mode evaluation_mode() const                   { return _async_safepoint; }
aoqi@0:   bool is_cheap_allocated() const                { return true; }
aoqi@0: };
aoqi@0: 
aoqi@0: class VM_Deoptimize: public VM_Operation {
aoqi@0:  public:
aoqi@0:   VM_Deoptimize() {}
aoqi@0:   VMOp_Type type() const                        { return VMOp_Deoptimize; }
aoqi@0:   void doit();
aoqi@0:   bool allow_nested_vm_operations() const        { return true; }
aoqi@0: };
aoqi@0: 
aoqi@0: 
aoqi@0: // Deopt helper that can deoptimize frames in threads other than the
aoqi@0: // current thread.  Only used through Deoptimization::deoptimize_frame.
aoqi@0: class VM_DeoptimizeFrame: public VM_Operation {
aoqi@0:   friend class Deoptimization;
aoqi@0: 
aoqi@0:  private:
aoqi@0:   JavaThread* _thread;
aoqi@0:   intptr_t*   _id;
aoqi@0:   VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id);
aoqi@0: 
aoqi@0:  public:
aoqi@0:   VMOp_Type type() const                         { return VMOp_DeoptimizeFrame; }
aoqi@0:   void doit();
aoqi@0:   bool allow_nested_vm_operations() const        { return true;  }
aoqi@0: };
aoqi@0: 
aoqi@0: #ifndef PRODUCT
aoqi@0: class VM_DeoptimizeAll: public VM_Operation {
aoqi@0:  private:
aoqi@0:   KlassHandle _dependee;
aoqi@0:  public:
aoqi@0:   VM_DeoptimizeAll() {}
aoqi@0:   VMOp_Type type() const                         { return VMOp_DeoptimizeAll; }
aoqi@0:   void doit();
aoqi@0:   bool allow_nested_vm_operations() const        { return true; }
aoqi@0: };
aoqi@0: 
aoqi@0: 
aoqi@0: class VM_ZombieAll: public VM_Operation {
aoqi@0:  public:
aoqi@0:   VM_ZombieAll() {}
aoqi@0:   VMOp_Type type() const                         { return VMOp_ZombieAll; }
aoqi@0:   void doit();
aoqi@0:   bool allow_nested_vm_operations() const        { return true; }
aoqi@0: };
aoqi@0: #endif // PRODUCT
aoqi@0: 
aoqi@0: class VM_UnlinkSymbols: public VM_Operation {
aoqi@0:  public:
aoqi@0:   VM_UnlinkSymbols() {}
aoqi@0:   VMOp_Type type() const                         { return VMOp_UnlinkSymbols; }
aoqi@0:   void doit();
aoqi@0:   bool allow_nested_vm_operations() const        { return true; }
aoqi@0: };
aoqi@0: 
aoqi@0: class VM_Verify: public VM_Operation {
aoqi@0:  private:
aoqi@0:   bool _silent;
aoqi@0:  public:
aoqi@0:   VM_Verify(bool silent = VerifySilently) : _silent(silent) {}
aoqi@0:   VMOp_Type type() const { return VMOp_Verify; }
aoqi@0:   void doit();
aoqi@0: };
aoqi@0: 
aoqi@0: 
aoqi@0: class VM_PrintThreads: public VM_Operation {
aoqi@0:  private:
aoqi@0:   outputStream* _out;
aoqi@0:   bool _print_concurrent_locks;
aoqi@0:  public:
aoqi@0:   VM_PrintThreads()                                                { _out = tty; _print_concurrent_locks = PrintConcurrentLocks; }
aoqi@0:   VM_PrintThreads(outputStream* out, bool print_concurrent_locks)  { _out = out; _print_concurrent_locks = print_concurrent_locks; }
aoqi@0:   VMOp_Type type() const                                           {  return VMOp_PrintThreads; }
aoqi@0:   void doit();
aoqi@0:   bool doit_prologue();
aoqi@0:   void doit_epilogue();
aoqi@0: };
aoqi@0: 
aoqi@0: class VM_PrintJNI: public VM_Operation {
aoqi@0:  private:
aoqi@0:   outputStream* _out;
aoqi@0:  public:
aoqi@0:   VM_PrintJNI()                         { _out = tty; }
aoqi@0:   VM_PrintJNI(outputStream* out)        { _out = out; }
aoqi@0:   VMOp_Type type() const                { return VMOp_PrintJNI; }
aoqi@0:   void doit();
aoqi@0: };
aoqi@0: 
aoqi@0: class DeadlockCycle;
aoqi@0: class VM_FindDeadlocks: public VM_Operation {
aoqi@0:  private:
aoqi@0:   bool           _concurrent_locks;
aoqi@0:   DeadlockCycle* _deadlocks;
aoqi@0:   outputStream*  _out;
aoqi@0: 
aoqi@0:  public:
aoqi@0:   VM_FindDeadlocks(bool concurrent_locks) :  _concurrent_locks(concurrent_locks), _out(NULL), _deadlocks(NULL) {};
aoqi@0:   VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _out(st), _deadlocks(NULL) {};
aoqi@0:   ~VM_FindDeadlocks();
aoqi@0: 
aoqi@0:   DeadlockCycle* result()      { return _deadlocks; };
aoqi@0:   VMOp_Type type() const       { return VMOp_FindDeadlocks; }
aoqi@0:   void doit();
aoqi@0:   bool doit_prologue();
aoqi@0: };
aoqi@0: 
aoqi@0: class ThreadDumpResult;
aoqi@0: class ThreadSnapshot;
aoqi@0: class ThreadConcurrentLocks;
aoqi@0: 
aoqi@0: class VM_ThreadDump : public VM_Operation {
aoqi@0:  private:
aoqi@0:   ThreadDumpResult*              _result;
aoqi@0:   int                            _num_threads;
aoqi@0:   GrowableArray<instanceHandle>* _threads;
aoqi@0:   int                            _max_depth;
aoqi@0:   bool                           _with_locked_monitors;
aoqi@0:   bool                           _with_locked_synchronizers;
aoqi@0: 
aoqi@0:   ThreadSnapshot* snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl);
aoqi@0: 
aoqi@0:  public:
aoqi@0:   VM_ThreadDump(ThreadDumpResult* result,
aoqi@0:                 int max_depth,  // -1 indicates entire stack
aoqi@0:                 bool with_locked_monitors,
aoqi@0:                 bool with_locked_synchronizers);
aoqi@0: 
aoqi@0:   VM_ThreadDump(ThreadDumpResult* result,
aoqi@0:                 GrowableArray<instanceHandle>* threads,
aoqi@0:                 int num_threads, // -1 indicates entire stack
aoqi@0:                 int max_depth,
aoqi@0:                 bool with_locked_monitors,
aoqi@0:                 bool with_locked_synchronizers);
aoqi@0: 
aoqi@0:   VMOp_Type type() const { return VMOp_ThreadDump; }
aoqi@0:   void doit();
aoqi@0:   bool doit_prologue();
aoqi@0:   void doit_epilogue();
aoqi@0: };
aoqi@0: 
aoqi@0: 
aoqi@0: class VM_Exit: public VM_Operation {
aoqi@0:  private:
aoqi@0:   int  _exit_code;
aoqi@0:   static volatile bool _vm_exited;
aoqi@0:   static Thread * _shutdown_thread;
aoqi@0:   static void wait_if_vm_exited();
aoqi@0:  public:
aoqi@0:   VM_Exit(int exit_code) {
aoqi@0:     _exit_code = exit_code;
aoqi@0:   }
aoqi@0:   static int wait_for_threads_in_native_to_block();
aoqi@0:   static int set_vm_exited();
aoqi@0:   static bool vm_exited()                      { return _vm_exited; }
aoqi@0:   static void block_if_vm_exited() {
aoqi@0:     if (_vm_exited) {
aoqi@0:       wait_if_vm_exited();
aoqi@0:     }
aoqi@0:   }
aoqi@0:   VMOp_Type type() const { return VMOp_Exit; }
aoqi@0:   void doit();
aoqi@0: };
aoqi@0: 
aoqi@0: 
aoqi@0: class VM_RotateGCLog: public VM_Operation {
aoqi@0:  private:
aoqi@0:   outputStream* _out;
aoqi@0: 
aoqi@0:  public:
aoqi@0:   VM_RotateGCLog(outputStream* st) : _out(st) {}
aoqi@0:   VMOp_Type type() const { return VMOp_RotateGCLog; }
aoqi@0:   void doit() { gclog_or_tty->rotate_log(true, _out); }
aoqi@0: };
aoqi@0: 
aoqi@0: #endif // SHARE_VM_RUNTIME_VM_OPERATIONS_HPP