/*
* Copyright (c) 1997, 2009, 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.
*
*/
// 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(HandleFullCodeCache) \
template(Verify) \
template(PrintJNI) \
template(HeapDumper) \
template(DeoptimizeTheWorld) \
template(GC_HeapInspection) \
template(GenCollectFull) \
template(GenCollectFullConcurrent) \
template(GenCollectForAllocation) \
template(GenCollectForPermanentAllocation) \
template(ParallelGCFailedAllocation) \
template(ParallelGCFailedPermanentAllocation) \
template(ParallelGCSystemGC) \
template(CGC_Operation) \
template(CMS_Initial_Mark) \
template(CMS_Final_Remark) \
template(G1CollectFull) \
template(G1CollectForAllocation) \
template(G1IncCollectionPause) \
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(Exit) \
class VM_Operation: public CHeapObj {
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;
}
// Debugging
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; }
};
class VM_DeoptimizeFrame: public VM_Operation {
private:
JavaThread* _thread;
intptr_t* _id;
public:
VM_DeoptimizeFrame(JavaThread* thread, intptr_t* id);
VMOp_Type type() const { return VMOp_DeoptimizeFrame; }
void doit();
bool allow_nested_vm_operations() const { return true; }
};
class VM_HandleFullCodeCache: public VM_Operation {
private:
bool _is_full;
public:
VM_HandleFullCodeCache(bool is_full) { _is_full = is_full; }
VMOp_Type type() const { return VMOp_HandleFullCodeCache; }
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_Verify: public VM_Operation {
private:
KlassHandle _dependee;
public:
VM_Verify() {}
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();
};