/*

 * Copyright (c) 1997, 2018, 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 "runtime/threadSMR.hpp"

#include "code/codeCache.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(ClearICs)                              \

  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(G1CollectForAllocation)                \

  template(G1CollectFull)                         \

  template(HandshakeOneThread)                    \

  template(HandshakeAllThreads)                   \

  template(HandshakeFallback)                     \

  template(EnableBiasedLocking)                   \

  template(RevokeBias)                            \

  template(BulkRevokeBias)                        \

  template(PopulateDumpSharedSpace)               \

  template(JNIFunctionTableCopier)                \

  template(RedefineClasses)                       \

  template(UpdateForPopTopFrame)                  \

  template(SetFramePop)                           \

  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(DumpHashtable)                         \

  template(DumpTouchedMethods)                    \

  template(MarkActiveNMethods)                    \

  template(PrintCompileQueue)                     \

  template(PrintClassHierarchy)                   \

  template(ThreadSuspend)                         \

  template(CTWThreshold)                          \

  template(ThreadsSuspendJVMTI)                   \

  template(ICBufferFull)                          \

  template(ScavengeMonitors)                      \

  template(PrintMetadata)                         \

  template(GTestExecuteAtSafepoint)               \

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 appropriately 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);

  }

};

class VM_ClearICs: public VM_Operation {

 private:

  bool _preserve_static_stubs;

 public:

  VM_ClearICs(bool preserve_static_stubs) { _preserve_static_stubs = preserve_static_stubs; }

  void doit();

  VMOp_Type type() const { return VMOp_ClearICs; }

};

// empty vm op, evaluated just to force a safepoint

class VM_ForceSafepoint: public VM_Operation {

 public:

  void doit()         {}

  VMOp_Type type() const { return VMOp_ForceSafepoint; }

};

// empty vm op, when forcing a safepoint to suspend a thread

class VM_ThreadSuspend: public VM_ForceSafepoint {

 public:

  VMOp_Type type() const { return VMOp_ThreadSuspend; }

};

// empty vm op, when forcing a safepoint due to ctw threshold is reached for the sweeper

class VM_CTWThreshold: public VM_ForceSafepoint {

 public:

  VMOp_Type type() const { return VMOp_CTWThreshold; }

};

// empty vm op, when forcing a safepoint to suspend threads from jvmti

class VM_ThreadsSuspendJVMTI: public VM_ForceSafepoint {

 public:

  VMOp_Type type() const { return VMOp_ThreadsSuspendJVMTI; }

};

// empty vm op, when forcing a safepoint due to inline cache buffers being full

class VM_ICBufferFull: public VM_ForceSafepoint {

 public:

  VMOp_Type type() const { return VMOp_ICBufferFull; }

};

// empty asynchronous vm op, when forcing a safepoint to scavenge monitors

class VM_ScavengeMonitors: public VM_ForceSafepoint {

 public:

  VMOp_Type type() const                         { return VMOp_ScavengeMonitors; }

  Mode evaluation_mode() const                   { return _async_safepoint; }

  bool is_cheap_allocated() const                { return true; }

};

// Base class for invoking parts of a gtest in a safepoint.

// Derived classes provide the doit method.

// Typically also need to transition the gtest thread from native to VM.

class VM_GTestExecuteAtSafepoint: public VM_Operation {

 public:

  VMOp_Type type() const                         { return VMOp_GTestExecuteAtSafepoint; }

 protected:

  VM_GTestExecuteAtSafepoint() {}

};

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; }

};

class VM_MarkActiveNMethods: public VM_Operation {

 public:

  VM_MarkActiveNMethods() {}

  VMOp_Type type() const                         { return VMOp_MarkActiveNMethods; }

  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;

  int _reason;

  VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id, int reason);

 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:

  Klass* _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 {

 public:

  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 VM_PrintMetadata : public VM_Operation {

 private:

  outputStream* const _out;

  const size_t        _scale;

  const int           _flags;

 public:

  VM_PrintMetadata(outputStream* out, size_t scale, int flags)

    : _out(out), _scale(scale), _flags(flags)

  {};

  VMOp_Type type() const  { return VMOp_PrintMetadata; }

  void doit();

};

class DeadlockCycle;

class VM_FindDeadlocks: public VM_Operation {

 private:

  bool              _concurrent_locks;

  DeadlockCycle*    _deadlocks;

  outputStream*     _out;

  ThreadsListSetter _setter;  // Helper to set hazard ptr in the originating thread

                              // which protects the JavaThreads in _deadlocks.

 public:

  VM_FindDeadlocks(bool concurrent_locks) :  _concurrent_locks(concurrent_locks), _out(NULL), _deadlocks(NULL), _setter() {};

  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();

};

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 * volatile _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 Thread * shutdown_thread()            { return _shutdown_thread; }

  static void block_if_vm_exited() {

    if (_vm_exited) {

      wait_if_vm_exited();

    }

  }

  VMOp_Type type() const { return VMOp_Exit; }

  void doit();

};

class VM_PrintCompileQueue: public VM_Operation {

 private:

  outputStream* _out;

 public:

  VM_PrintCompileQueue(outputStream* st) : _out(st) {}

  VMOp_Type type() const { return VMOp_PrintCompileQueue; }

  Mode evaluation_mode() const { return _safepoint; }

  void doit();

};

#if INCLUDE_SERVICES

class VM_PrintClassHierarchy: public VM_Operation {

 private:

  outputStream* _out;

  bool _print_interfaces;

  bool _print_subclasses;

  char* _classname;

 public:

  VM_PrintClassHierarchy(outputStream* st, bool print_interfaces, bool print_subclasses, char* classname) :

    _out(st), _print_interfaces(print_interfaces), _print_subclasses(print_subclasses),

    _classname(classname) {}

  VMOp_Type type() const { return VMOp_PrintClassHierarchy; }

  void doit();

};

#endif // INCLUDE_SERVICES