| /* |
| * 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) \ |
| |
| 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 |