--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/runtime/vmOperations.hpp Thu Dec 06 15:44:40 2018 +0100
@@ -0,0 +1,512 @@
+/*
+ * 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_VMOPERATIONS_HPP
+#define SHARE_VM_RUNTIME_VMOPERATIONS_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(None) \
+ template(ThreadStop) \
+ template(ThreadDump) \
+ template(PrintThreads) \
+ template(FindDeadlocks) \
+ template(ClearICs) \
+ template(ForceSafepoint) \
+ template(ForceAsyncSafepoint) \
+ template(Deoptimize) \
+ template(DeoptimizeFrame) \
+ template(DeoptimizeAll) \
+ template(ZombieAll) \
+ template(Verify) \
+ template(PrintJNI) \
+ template(HeapDumper) \
+ template(DeoptimizeTheWorld) \
+ template(CollectForMetadataAllocation) \
+ template(GC_HeapInspection) \
+ template(GenCollectFull) \
+ template(GenCollectFullConcurrent) \
+ template(GenCollectForAllocation) \
+ template(ParallelGCFailedAllocation) \
+ template(ParallelGCSystemGC) \
+ template(CMS_Initial_Mark) \
+ template(CMS_Final_Remark) \
+ template(G1CollectForAllocation) \
+ template(G1CollectFull) \
+ template(G1Concurrent) \
+ template(ZOperation) \
+ 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(ClassLoaderHierarchyOperation) \
+ 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_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;
+ bool _print_extended_info;
+ public:
+ VM_PrintThreads()
+ : _out(tty), _print_concurrent_locks(PrintConcurrentLocks), _print_extended_info(false)
+ {}
+ VM_PrintThreads(outputStream* out, bool print_concurrent_locks, bool print_extended_info)
+ : _out(out), _print_concurrent_locks(print_concurrent_locks), _print_extended_info(print_extended_info)
+ {}
+ 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), _deadlocks(NULL), _out(NULL), _setter() {};
+ VM_FindDeadlocks(outputStream* st) : _concurrent_locks(true), _deadlocks(NULL), _out(st) {};
+ ~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
+
+#endif // SHARE_VM_RUNTIME_VMOPERATIONS_HPP