1869 lines
75 KiB
C++
1869 lines
75 KiB
C++
/*
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* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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class ThreadSafepointState;
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class ThreadProfiler;
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class JvmtiThreadState;
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class JvmtiGetLoadedClassesClosure;
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class ThreadStatistics;
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class ConcurrentLocksDump;
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class ParkEvent ;
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class ciEnv;
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class CompileThread;
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class CompileLog;
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class CompileTask;
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class CompileQueue;
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class CompilerCounters;
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class vframeArray;
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class DeoptResourceMark;
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class jvmtiDeferredLocalVariableSet;
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class GCTaskQueue;
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class ThreadClosure;
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class IdealGraphPrinter;
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// Class hierarchy
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// - Thread
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// - NamedThread
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// - VMThread
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// - ConcurrentGCThread
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// - WorkerThread
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// - GangWorker
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// - GCTaskThread
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// - JavaThread
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// - WatcherThread
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class Thread: public ThreadShadow {
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friend class VMStructs;
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private:
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// Exception handling
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// (Note: _pending_exception and friends are in ThreadShadow)
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//oop _pending_exception; // pending exception for current thread
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// const char* _exception_file; // file information for exception (debugging only)
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// int _exception_line; // line information for exception (debugging only)
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// Support for forcing alignment of thread objects for biased locking
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void* _real_malloc_address;
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public:
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void* operator new(size_t size);
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void operator delete(void* p);
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private:
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// ***************************************************************
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// Suspend and resume support
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// ***************************************************************
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//
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// VM suspend/resume no longer exists - it was once used for various
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// things including safepoints but was deprecated and finally removed
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// in Java 7. Because VM suspension was considered "internal" Java-level
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// suspension was considered "external", and this legacy naming scheme
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// remains.
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//
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// External suspend/resume requests come from JVM_SuspendThread,
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// JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI
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// ResumeThread. External
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// suspend requests cause _external_suspend to be set and external
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// resume requests cause _external_suspend to be cleared.
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// External suspend requests do not nest on top of other external
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// suspend requests. The higher level APIs reject suspend requests
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// for already suspended threads.
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//
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// The external_suspend
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// flag is checked by has_special_runtime_exit_condition() and java thread
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// will self-suspend when handle_special_runtime_exit_condition() is
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// called. Most uses of the _thread_blocked state in JavaThreads are
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// considered the same as being externally suspended; if the blocking
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// condition lifts, the JavaThread will self-suspend. Other places
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// where VM checks for external_suspend include:
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// + mutex granting (do not enter monitors when thread is suspended)
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// + state transitions from _thread_in_native
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//
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// In general, java_suspend() does not wait for an external suspend
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// request to complete. When it returns, the only guarantee is that
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// the _external_suspend field is true.
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//
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// wait_for_ext_suspend_completion() is used to wait for an external
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// suspend request to complete. External suspend requests are usually
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// followed by some other interface call that requires the thread to
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// be quiescent, e.g., GetCallTrace(). By moving the "wait time" into
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// the interface that requires quiescence, we give the JavaThread a
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// chance to self-suspend before we need it to be quiescent. This
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// improves overall suspend/query performance.
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//
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// _suspend_flags controls the behavior of java_ suspend/resume.
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// It must be set under the protection of SR_lock. Read from the flag is
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// OK without SR_lock as long as the value is only used as a hint.
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// (e.g., check _external_suspend first without lock and then recheck
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// inside SR_lock and finish the suspension)
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//
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// _suspend_flags is also overloaded for other "special conditions" so
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// that a single check indicates whether any special action is needed
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// eg. for async exceptions.
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// -------------------------------------------------------------------
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// Notes:
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// 1. The suspend/resume logic no longer uses ThreadState in OSThread
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// but we still update its value to keep other part of the system (mainly
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// JVMTI) happy. ThreadState is legacy code (see notes in
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// osThread.hpp).
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//
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// 2. It would be more natural if set_external_suspend() is private and
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// part of java_suspend(), but that probably would affect the suspend/query
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// performance. Need more investigation on this.
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//
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// suspend/resume lock: used for self-suspend
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Monitor* _SR_lock;
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protected:
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enum SuspendFlags {
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// NOTE: avoid using the sign-bit as cc generates different test code
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// when the sign-bit is used, and sometimes incorrectly - see CR 6398077
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_external_suspend = 0x20000000U, // thread is asked to self suspend
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_ext_suspended = 0x40000000U, // thread has self-suspended
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_deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt
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_has_async_exception = 0x00000001U // there is a pending async exception
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};
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// various suspension related flags - atomically updated
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// overloaded for async exception checking in check_special_condition_for_native_trans.
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volatile uint32_t _suspend_flags;
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private:
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int _num_nested_signal;
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public:
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void enter_signal_handler() { _num_nested_signal++; }
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void leave_signal_handler() { _num_nested_signal--; }
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bool is_inside_signal_handler() const { return _num_nested_signal > 0; }
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private:
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// Debug tracing
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static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;
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// Active_handles points to a block of handles
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JNIHandleBlock* _active_handles;
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// One-element thread local free list
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JNIHandleBlock* _free_handle_block;
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// Point to the last handle mark
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HandleMark* _last_handle_mark;
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// The parity of the last strong_roots iteration in which this thread was
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// claimed as a task.
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jint _oops_do_parity;
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public:
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void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }
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HandleMark* last_handle_mark() const { return _last_handle_mark; }
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private:
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// debug support for checking if code does allow safepoints or not
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// GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on
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// mutex, or blocking on an object synchronizer (Java locking).
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// If !allow_safepoint(), then an assertion failure will happen in any of the above cases
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// If !allow_allocation(), then an assertion failure will happen during allocation
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// (Hence, !allow_safepoint() => !allow_allocation()).
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//
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// The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.
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//
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NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen
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debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.
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// Used by SkipGCALot class.
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NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?
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// Record when GC is locked out via the GC_locker mechanism
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CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)
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friend class No_Alloc_Verifier;
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friend class No_Safepoint_Verifier;
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friend class Pause_No_Safepoint_Verifier;
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friend class ThreadLocalStorage;
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friend class GC_locker;
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ThreadLocalAllocBuffer _tlab; // Thread-local eden
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int _vm_operation_started_count; // VM_Operation support
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int _vm_operation_completed_count; // VM_Operation support
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ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread
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// is waiting to lock
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bool _current_pending_monitor_is_from_java; // locking is from Java code
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// ObjectMonitor on which this thread called Object.wait()
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ObjectMonitor* _current_waiting_monitor;
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// Private thread-local objectmonitor list - a simple cache organized as a SLL.
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public:
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ObjectMonitor * omFreeList ;
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int omFreeCount ; // length of omFreeList
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int omFreeProvision ; // reload chunk size
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ObjectMonitor * omInUseList; // SLL to track monitors in circulation
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int omInUseCount; // length of omInUseList
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public:
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enum {
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is_definitely_current_thread = true
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};
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// Constructor
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Thread();
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virtual ~Thread();
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// initializtion
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void initialize_thread_local_storage();
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// thread entry point
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virtual void run();
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// Testers
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virtual bool is_VM_thread() const { return false; }
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virtual bool is_Java_thread() const { return false; }
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// Remove this ifdef when C1 is ported to the compiler interface.
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virtual bool is_Compiler_thread() const { return false; }
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virtual bool is_hidden_from_external_view() const { return false; }
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virtual bool is_jvmti_agent_thread() const { return false; }
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// True iff the thread can perform GC operations at a safepoint.
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// Generally will be true only of VM thread and parallel GC WorkGang
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// threads.
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virtual bool is_GC_task_thread() const { return false; }
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virtual bool is_Watcher_thread() const { return false; }
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virtual bool is_ConcurrentGC_thread() const { return false; }
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virtual bool is_Named_thread() const { return false; }
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virtual char* name() const { return (char*)"Unknown thread"; }
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// Returns the current thread
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static inline Thread* current();
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// Common thread operations
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static void set_priority(Thread* thread, ThreadPriority priority);
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static ThreadPriority get_priority(const Thread* const thread);
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static void start(Thread* thread);
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static void interrupt(Thread* thr);
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static bool is_interrupted(Thread* thr, bool clear_interrupted);
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ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }
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Monitor* SR_lock() const { return _SR_lock; }
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bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
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void set_suspend_flag(SuspendFlags f) {
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assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
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uint32_t flags;
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do {
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flags = _suspend_flags;
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}
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while (Atomic::cmpxchg((jint)(flags | f),
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(volatile jint*)&_suspend_flags,
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(jint)flags) != (jint)flags);
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}
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void clear_suspend_flag(SuspendFlags f) {
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assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");
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uint32_t flags;
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do {
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flags = _suspend_flags;
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}
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while (Atomic::cmpxchg((jint)(flags & ~f),
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(volatile jint*)&_suspend_flags,
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(jint)flags) != (jint)flags);
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}
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void set_has_async_exception() {
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set_suspend_flag(_has_async_exception);
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}
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void clear_has_async_exception() {
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clear_suspend_flag(_has_async_exception);
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}
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// Support for Unhandled Oop detection
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#ifdef CHECK_UNHANDLED_OOPS
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private:
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UnhandledOops *_unhandled_oops;
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public:
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UnhandledOops* unhandled_oops() { return _unhandled_oops; }
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// Mark oop safe for gc. It may be stack allocated but won't move.
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void allow_unhandled_oop(oop *op) {
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if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);
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}
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// Clear oops at safepoint so crashes point to unhandled oop violator
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void clear_unhandled_oops() {
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if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();
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}
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bool is_gc_locked_out() { return _gc_locked_out_count > 0; }
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#endif // CHECK_UNHANDLED_OOPS
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#ifndef PRODUCT
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bool skip_gcalot() { return _skip_gcalot; }
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void set_skip_gcalot(bool v) { _skip_gcalot = v; }
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#endif
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public:
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// Installs a pending exception to be inserted later
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static void send_async_exception(oop thread_oop, oop java_throwable);
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// Resource area
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ResourceArea* resource_area() const { return _resource_area; }
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void set_resource_area(ResourceArea* area) { _resource_area = area; }
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OSThread* osthread() const { return _osthread; }
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void set_osthread(OSThread* thread) { _osthread = thread; }
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// JNI handle support
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JNIHandleBlock* active_handles() const { return _active_handles; }
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void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
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JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
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void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
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// Internal handle support
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HandleArea* handle_area() const { return _handle_area; }
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void set_handle_area(HandleArea* area) { _handle_area = area; }
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// Thread-Local Allocation Buffer (TLAB) support
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ThreadLocalAllocBuffer& tlab() { return _tlab; }
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void initialize_tlab() {
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if (UseTLAB) {
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tlab().initialize();
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}
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}
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// VM operation support
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int vm_operation_ticket() { return ++_vm_operation_started_count; }
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int vm_operation_completed_count() { return _vm_operation_completed_count; }
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void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }
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// For tracking the heavyweight monitor the thread is pending on.
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ObjectMonitor* current_pending_monitor() {
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return _current_pending_monitor;
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}
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void set_current_pending_monitor(ObjectMonitor* monitor) {
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_current_pending_monitor = monitor;
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}
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void set_current_pending_monitor_is_from_java(bool from_java) {
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_current_pending_monitor_is_from_java = from_java;
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}
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bool current_pending_monitor_is_from_java() {
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return _current_pending_monitor_is_from_java;
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}
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// For tracking the ObjectMonitor on which this thread called Object.wait()
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ObjectMonitor* current_waiting_monitor() {
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return _current_waiting_monitor;
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}
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void set_current_waiting_monitor(ObjectMonitor* monitor) {
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_current_waiting_monitor = monitor;
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}
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// GC support
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// Apply "f->do_oop" to all root oops in "this".
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// Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames
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void oops_do(OopClosure* f, CodeBlobClosure* cf);
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// Handles the parallel case for the method below.
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private:
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bool claim_oops_do_par_case(int collection_parity);
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public:
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// Requires that "collection_parity" is that of the current strong roots
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// iteration. If "is_par" is false, sets the parity of "this" to
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// "collection_parity", and returns "true". If "is_par" is true,
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// uses an atomic instruction to set the current threads parity to
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// "collection_parity", if it is not already. Returns "true" iff the
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// calling thread does the update, this indicates that the calling thread
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// has claimed the thread's stack as a root groop in the current
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// collection.
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bool claim_oops_do(bool is_par, int collection_parity) {
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if (!is_par) {
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_oops_do_parity = collection_parity;
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return true;
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} else {
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return claim_oops_do_par_case(collection_parity);
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}
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}
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// Sweeper support
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void nmethods_do(CodeBlobClosure* cf);
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// Used by fast lock support
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virtual bool is_lock_owned(address adr) const;
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// Check if address is in the stack of the thread (not just for locks).
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// Warning: the method can only be used on the running thread
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bool is_in_stack(address adr) const;
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// Sets this thread as starting thread. Returns failure if thread
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// creation fails due to lack of memory, too many threads etc.
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bool set_as_starting_thread();
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protected:
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// OS data associated with the thread
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OSThread* _osthread; // Platform-specific thread information
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// Thread local resource area for temporary allocation within the VM
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ResourceArea* _resource_area;
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// Thread local handle area for allocation of handles within the VM
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HandleArea* _handle_area;
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// Support for stack overflow handling, get_thread, etc.
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address _stack_base;
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size_t _stack_size;
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uintptr_t _self_raw_id; // used by get_thread (mutable)
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int _lgrp_id;
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public:
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// Stack overflow support
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address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }
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void set_stack_base(address base) { _stack_base = base; }
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size_t stack_size() const { return _stack_size; }
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void set_stack_size(size_t size) { _stack_size = size; }
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void record_stack_base_and_size();
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bool on_local_stack(address adr) const {
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/* QQQ this has knowledge of direction, ought to be a stack method */
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return (_stack_base >= adr && adr >= (_stack_base - _stack_size));
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}
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int lgrp_id() const { return _lgrp_id; }
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void set_lgrp_id(int value) { _lgrp_id = value; }
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// Printing
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void print_on(outputStream* st) const;
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void print() const { print_on(tty); }
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virtual void print_on_error(outputStream* st, char* buf, int buflen) const;
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// Debug-only code
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#ifdef ASSERT
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private:
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// Deadlock detection support for Mutex locks. List of locks own by thread.
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Monitor *_owned_locks;
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// Mutex::set_owner_implementation is the only place where _owned_locks is modified,
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// thus the friendship
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friend class Mutex;
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friend class Monitor;
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public:
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void print_owned_locks_on(outputStream* st) const;
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void print_owned_locks() const { print_owned_locks_on(tty); }
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Monitor * owned_locks() const { return _owned_locks; }
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bool owns_locks() const { return owned_locks() != NULL; }
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bool owns_locks_but_compiled_lock() const;
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// Deadlock detection
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bool allow_allocation() { return _allow_allocation_count == 0; }
|
|
#endif
|
|
|
|
void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;
|
|
|
|
private:
|
|
volatile int _jvmti_env_iteration_count;
|
|
|
|
public:
|
|
void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; }
|
|
void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; }
|
|
bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; }
|
|
|
|
// Code generation
|
|
static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); }
|
|
static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); }
|
|
static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); }
|
|
|
|
static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); }
|
|
static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); }
|
|
|
|
#define TLAB_FIELD_OFFSET(name) \
|
|
static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); }
|
|
|
|
TLAB_FIELD_OFFSET(start)
|
|
TLAB_FIELD_OFFSET(end)
|
|
TLAB_FIELD_OFFSET(top)
|
|
TLAB_FIELD_OFFSET(pf_top)
|
|
TLAB_FIELD_OFFSET(size) // desired_size
|
|
TLAB_FIELD_OFFSET(refill_waste_limit)
|
|
TLAB_FIELD_OFFSET(number_of_refills)
|
|
TLAB_FIELD_OFFSET(fast_refill_waste)
|
|
TLAB_FIELD_OFFSET(slow_allocations)
|
|
|
|
#undef TLAB_FIELD_OFFSET
|
|
|
|
public:
|
|
volatile intptr_t _Stalled ;
|
|
volatile int _TypeTag ;
|
|
ParkEvent * _ParkEvent ; // for synchronized()
|
|
ParkEvent * _SleepEvent ; // for Thread.sleep
|
|
ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor
|
|
ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease
|
|
int NativeSyncRecursion ; // diagnostic
|
|
|
|
volatile int _OnTrap ; // Resume-at IP delta
|
|
jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG
|
|
jint _hashStateX ; // thread-specific hashCode generator state
|
|
jint _hashStateY ;
|
|
jint _hashStateZ ;
|
|
void * _schedctl ;
|
|
|
|
intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code
|
|
static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); }
|
|
static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); }
|
|
|
|
volatile jint rng [4] ; // RNG for spin loop
|
|
|
|
// Low-level leaf-lock primitives used to implement synchronization
|
|
// and native monitor-mutex infrastructure.
|
|
// Not for general synchronization use.
|
|
static void SpinAcquire (volatile int * Lock, const char * Name) ;
|
|
static void SpinRelease (volatile int * Lock) ;
|
|
static void muxAcquire (volatile intptr_t * Lock, const char * Name) ;
|
|
static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ;
|
|
static void muxRelease (volatile intptr_t * Lock) ;
|
|
|
|
};
|
|
|
|
// Inline implementation of Thread::current()
|
|
// Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of
|
|
// startup.
|
|
// ThreadLocalStorage::thread is warm -- it's called > 16K times in the same
|
|
// period. This is inlined in thread_<os_family>.inline.hpp.
|
|
|
|
inline Thread* Thread::current() {
|
|
#ifdef ASSERT
|
|
// This function is very high traffic. Define PARANOID to enable expensive
|
|
// asserts.
|
|
#ifdef PARANOID
|
|
// Signal handler should call ThreadLocalStorage::get_thread_slow()
|
|
Thread* t = ThreadLocalStorage::get_thread_slow();
|
|
assert(t != NULL && !t->is_inside_signal_handler(),
|
|
"Don't use Thread::current() inside signal handler");
|
|
#endif
|
|
#endif
|
|
Thread* thread = ThreadLocalStorage::thread();
|
|
assert(thread != NULL, "just checking");
|
|
return thread;
|
|
}
|
|
|
|
// Name support for threads. non-JavaThread subclasses with multiple
|
|
// uniquely named instances should derive from this.
|
|
class NamedThread: public Thread {
|
|
friend class VMStructs;
|
|
enum {
|
|
max_name_len = 64
|
|
};
|
|
private:
|
|
char* _name;
|
|
// log JavaThread being processed by oops_do
|
|
JavaThread* _processed_thread;
|
|
|
|
public:
|
|
NamedThread();
|
|
~NamedThread();
|
|
// May only be called once per thread.
|
|
void set_name(const char* format, ...);
|
|
virtual bool is_Named_thread() const { return true; }
|
|
virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; }
|
|
JavaThread *processed_thread() { return _processed_thread; }
|
|
void set_processed_thread(JavaThread *thread) { _processed_thread = thread; }
|
|
};
|
|
|
|
// Worker threads are named and have an id of an assigned work.
|
|
class WorkerThread: public NamedThread {
|
|
private:
|
|
uint _id;
|
|
public:
|
|
WorkerThread() : _id(0) { }
|
|
void set_id(uint work_id) { _id = work_id; }
|
|
uint id() const { return _id; }
|
|
};
|
|
|
|
// A single WatcherThread is used for simulating timer interrupts.
|
|
class WatcherThread: public Thread {
|
|
friend class VMStructs;
|
|
public:
|
|
virtual void run();
|
|
|
|
private:
|
|
static WatcherThread* _watcher_thread;
|
|
|
|
volatile static bool _should_terminate; // updated without holding lock
|
|
public:
|
|
enum SomeConstants {
|
|
delay_interval = 10 // interrupt delay in milliseconds
|
|
};
|
|
|
|
// Constructor
|
|
WatcherThread();
|
|
|
|
// Tester
|
|
bool is_Watcher_thread() const { return true; }
|
|
|
|
// Printing
|
|
char* name() const { return (char*)"VM Periodic Task Thread"; }
|
|
void print_on(outputStream* st) const;
|
|
void print() const { print_on(tty); }
|
|
|
|
// Returns the single instance of WatcherThread
|
|
static WatcherThread* watcher_thread() { return _watcher_thread; }
|
|
|
|
// Create and start the single instance of WatcherThread, or stop it on shutdown
|
|
static void start();
|
|
static void stop();
|
|
};
|
|
|
|
|
|
class CompilerThread;
|
|
|
|
typedef void (*ThreadFunction)(JavaThread*, TRAPS);
|
|
|
|
class JavaThread: public Thread {
|
|
friend class VMStructs;
|
|
private:
|
|
JavaThread* _next; // The next thread in the Threads list
|
|
oop _threadObj; // The Java level thread object
|
|
|
|
#ifdef ASSERT
|
|
private:
|
|
int _java_call_counter;
|
|
|
|
public:
|
|
int java_call_counter() { return _java_call_counter; }
|
|
void inc_java_call_counter() { _java_call_counter++; }
|
|
void dec_java_call_counter() {
|
|
assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper");
|
|
_java_call_counter--;
|
|
}
|
|
private: // restore original namespace restriction
|
|
#endif // ifdef ASSERT
|
|
|
|
#ifndef PRODUCT
|
|
public:
|
|
enum {
|
|
jump_ring_buffer_size = 16
|
|
};
|
|
private: // restore original namespace restriction
|
|
#endif
|
|
|
|
JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state
|
|
|
|
ThreadFunction _entry_point;
|
|
|
|
JNIEnv _jni_environment;
|
|
|
|
// Deopt support
|
|
DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization
|
|
|
|
intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we
|
|
// transition out of native
|
|
nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized
|
|
vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays
|
|
vframeArray* _vframe_array_last; // Holds last vFrameArray we popped
|
|
// Because deoptimization is lazy we must save jvmti requests to set locals
|
|
// in compiled frames until we deoptimize and we have an interpreter frame.
|
|
// This holds the pointer to array (yeah like there might be more than one) of
|
|
// description of compiled vframes that have locals that need to be updated.
|
|
GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates;
|
|
|
|
// Handshake value for fixing 6243940. We need a place for the i2c
|
|
// adapter to store the callee methodOop. This value is NEVER live
|
|
// across a gc point so it does NOT have to be gc'd
|
|
// The handshake is open ended since we can't be certain that it will
|
|
// be NULLed. This is because we rarely ever see the race and end up
|
|
// in handle_wrong_method which is the backend of the handshake. See
|
|
// code in i2c adapters and handle_wrong_method.
|
|
|
|
methodOop _callee_target;
|
|
|
|
// Oop results of VM runtime calls
|
|
oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved
|
|
oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved
|
|
|
|
// See ReduceInitialCardMarks: this holds the precise space interval of
|
|
// the most recent slow path allocation for which compiled code has
|
|
// elided card-marks for performance along the fast-path.
|
|
MemRegion _deferred_card_mark;
|
|
|
|
MonitorChunk* _monitor_chunks; // Contains the off stack monitors
|
|
// allocated during deoptimization
|
|
// and by JNI_MonitorEnter/Exit
|
|
|
|
// Async. requests support
|
|
enum AsyncRequests {
|
|
_no_async_condition = 0,
|
|
_async_exception,
|
|
_async_unsafe_access_error
|
|
};
|
|
AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request
|
|
oop _pending_async_exception;
|
|
|
|
// Safepoint support
|
|
public: // Expose _thread_state for SafeFetchInt()
|
|
volatile JavaThreadState _thread_state;
|
|
private:
|
|
ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint
|
|
address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
|
|
|
|
// JavaThread termination support
|
|
enum TerminatedTypes {
|
|
_not_terminated = 0xDEAD - 2,
|
|
_thread_exiting, // JavaThread::exit() has been called for this thread
|
|
_thread_terminated, // JavaThread is removed from thread list
|
|
_vm_exited // JavaThread is still executing native code, but VM is terminated
|
|
// only VM_Exit can set _vm_exited
|
|
};
|
|
|
|
// In general a JavaThread's _terminated field transitions as follows:
|
|
//
|
|
// _not_terminated => _thread_exiting => _thread_terminated
|
|
//
|
|
// _vm_exited is a special value to cover the case of a JavaThread
|
|
// executing native code after the VM itself is terminated.
|
|
TerminatedTypes _terminated;
|
|
// suspend/resume support
|
|
volatile bool _suspend_equivalent; // Suspend equivalent condition
|
|
jint _in_deopt_handler; // count of deoptimization
|
|
// handlers thread is in
|
|
volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access
|
|
bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was
|
|
// never locked) when throwing an exception. Used by interpreter only.
|
|
|
|
// Flag to mark a JNI thread in the process of attaching - See CR 6404306
|
|
// This flag is never set true other than at construction, and in that case
|
|
// is shortly thereafter set false
|
|
volatile bool _is_attaching;
|
|
|
|
public:
|
|
// State of the stack guard pages for this thread.
|
|
enum StackGuardState {
|
|
stack_guard_unused, // not needed
|
|
stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow
|
|
stack_guard_enabled // enabled
|
|
};
|
|
|
|
private:
|
|
|
|
StackGuardState _stack_guard_state;
|
|
|
|
// Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is
|
|
// used to temp. parsing values into and out of the runtime system during exception handling for compiled
|
|
// code)
|
|
volatile oop _exception_oop; // Exception thrown in compiled code
|
|
volatile address _exception_pc; // PC where exception happened
|
|
volatile address _exception_handler_pc; // PC for handler of exception
|
|
volatile int _exception_stack_size; // Size of frame where exception happened
|
|
volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
|
|
|
|
// support for compilation
|
|
bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible)
|
|
|
|
// support for JNI critical regions
|
|
jint _jni_active_critical; // count of entries into JNI critical region
|
|
|
|
// For deadlock detection.
|
|
int _depth_first_number;
|
|
|
|
// JVMTI PopFrame support
|
|
// This is set to popframe_pending to signal that top Java frame should be popped immediately
|
|
int _popframe_condition;
|
|
|
|
#ifndef PRODUCT
|
|
int _jmp_ring_index;
|
|
struct {
|
|
// We use intptr_t instead of address so debugger doesn't try and display strings
|
|
intptr_t _target;
|
|
intptr_t _instruction;
|
|
const char* _file;
|
|
int _line;
|
|
} _jmp_ring[ jump_ring_buffer_size ];
|
|
#endif /* PRODUCT */
|
|
|
|
#ifndef SERIALGC
|
|
// Support for G1 barriers
|
|
|
|
ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier.
|
|
// Set of all such queues.
|
|
static SATBMarkQueueSet _satb_mark_queue_set;
|
|
|
|
DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards.
|
|
// Set of all such queues.
|
|
static DirtyCardQueueSet _dirty_card_queue_set;
|
|
|
|
void flush_barrier_queues();
|
|
#endif // !SERIALGC
|
|
|
|
friend class VMThread;
|
|
friend class ThreadWaitTransition;
|
|
friend class VM_Exit;
|
|
|
|
void initialize(); // Initialized the instance variables
|
|
|
|
public:
|
|
// Constructor
|
|
JavaThread(bool is_attaching = false); // for main thread and JNI attached threads
|
|
JavaThread(ThreadFunction entry_point, size_t stack_size = 0);
|
|
~JavaThread();
|
|
|
|
#ifdef ASSERT
|
|
// verify this JavaThread hasn't be published in the Threads::list yet
|
|
void verify_not_published();
|
|
#endif
|
|
|
|
//JNI functiontable getter/setter for JVMTI jni function table interception API.
|
|
void set_jni_functions(struct JNINativeInterface_* functionTable) {
|
|
_jni_environment.functions = functionTable;
|
|
}
|
|
struct JNINativeInterface_* get_jni_functions() {
|
|
return (struct JNINativeInterface_ *)_jni_environment.functions;
|
|
}
|
|
|
|
// This function is called at thread creation to allow
|
|
// platform specific thread variables to be initialized.
|
|
void cache_global_variables();
|
|
|
|
// Executes Shutdown.shutdown()
|
|
void invoke_shutdown_hooks();
|
|
|
|
// Cleanup on thread exit
|
|
enum ExitType {
|
|
normal_exit,
|
|
jni_detach
|
|
};
|
|
void exit(bool destroy_vm, ExitType exit_type = normal_exit);
|
|
|
|
void cleanup_failed_attach_current_thread();
|
|
|
|
// Testers
|
|
virtual bool is_Java_thread() const { return true; }
|
|
|
|
// compilation
|
|
void set_is_compiling(bool f) { _is_compiling = f; }
|
|
bool is_compiling() const { return _is_compiling; }
|
|
|
|
// Thread chain operations
|
|
JavaThread* next() const { return _next; }
|
|
void set_next(JavaThread* p) { _next = p; }
|
|
|
|
// Thread oop. threadObj() can be NULL for initial JavaThread
|
|
// (or for threads attached via JNI)
|
|
oop threadObj() const { return _threadObj; }
|
|
void set_threadObj(oop p) { _threadObj = p; }
|
|
|
|
ThreadPriority java_priority() const; // Read from threadObj()
|
|
|
|
// Prepare thread and add to priority queue. If a priority is
|
|
// not specified, use the priority of the thread object. Threads_lock
|
|
// must be held while this function is called.
|
|
void prepare(jobject jni_thread, ThreadPriority prio=NoPriority);
|
|
|
|
void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; }
|
|
address saved_exception_pc() { return _saved_exception_pc; }
|
|
|
|
|
|
ThreadFunction entry_point() const { return _entry_point; }
|
|
|
|
// Allocates a new Java level thread object for this thread. thread_name may be NULL.
|
|
void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS);
|
|
|
|
// Last frame anchor routines
|
|
|
|
JavaFrameAnchor* frame_anchor(void) { return &_anchor; }
|
|
|
|
// last_Java_sp
|
|
bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); }
|
|
intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); }
|
|
|
|
// last_Java_pc
|
|
|
|
address last_Java_pc(void) { return _anchor.last_Java_pc(); }
|
|
|
|
// Safepoint support
|
|
JavaThreadState thread_state() const { return _thread_state; }
|
|
void set_thread_state(JavaThreadState s) { _thread_state=s; }
|
|
ThreadSafepointState *safepoint_state() const { return _safepoint_state; }
|
|
void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; }
|
|
bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); }
|
|
|
|
// thread has called JavaThread::exit() or is terminated
|
|
bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); }
|
|
// thread is terminated (no longer on the threads list); we compare
|
|
// against the two non-terminated values so that a freed JavaThread
|
|
// will also be considered terminated.
|
|
bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; }
|
|
void set_terminated(TerminatedTypes t) { _terminated = t; }
|
|
// special for Threads::remove() which is static:
|
|
void set_terminated_value() { _terminated = _thread_terminated; }
|
|
void block_if_vm_exited();
|
|
|
|
bool doing_unsafe_access() { return _doing_unsafe_access; }
|
|
void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; }
|
|
|
|
bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; }
|
|
void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; }
|
|
|
|
|
|
// Suspend/resume support for JavaThread
|
|
|
|
private:
|
|
void set_ext_suspended() { set_suspend_flag (_ext_suspended); }
|
|
void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); }
|
|
|
|
public:
|
|
void java_suspend();
|
|
void java_resume();
|
|
int java_suspend_self();
|
|
|
|
void check_and_wait_while_suspended() {
|
|
assert(JavaThread::current() == this, "sanity check");
|
|
|
|
bool do_self_suspend;
|
|
do {
|
|
// were we externally suspended while we were waiting?
|
|
do_self_suspend = handle_special_suspend_equivalent_condition();
|
|
if (do_self_suspend) {
|
|
// don't surprise the thread that suspended us by returning
|
|
java_suspend_self();
|
|
set_suspend_equivalent();
|
|
}
|
|
} while (do_self_suspend);
|
|
}
|
|
static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread);
|
|
// Check for async exception in addition to safepoint and suspend request.
|
|
static void check_special_condition_for_native_trans(JavaThread *thread);
|
|
|
|
bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits);
|
|
bool is_ext_suspend_completed_with_lock(uint32_t *bits) {
|
|
MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
// Warning: is_ext_suspend_completed() may temporarily drop the
|
|
// SR_lock to allow the thread to reach a stable thread state if
|
|
// it is currently in a transient thread state.
|
|
return is_ext_suspend_completed(false /*!called_by_wait */,
|
|
SuspendRetryDelay, bits);
|
|
}
|
|
|
|
// We cannot allow wait_for_ext_suspend_completion() to run forever or
|
|
// we could hang. SuspendRetryCount and SuspendRetryDelay are normally
|
|
// passed as the count and delay parameters. Experiments with specific
|
|
// calls to wait_for_ext_suspend_completion() can be done by passing
|
|
// other values in the code. Experiments with all calls can be done
|
|
// via the appropriate -XX options.
|
|
bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits);
|
|
|
|
void set_external_suspend() { set_suspend_flag (_external_suspend); }
|
|
void clear_external_suspend() { clear_suspend_flag(_external_suspend); }
|
|
|
|
void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); }
|
|
void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); }
|
|
bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; }
|
|
|
|
bool is_external_suspend() const {
|
|
return (_suspend_flags & _external_suspend) != 0;
|
|
}
|
|
// Whenever a thread transitions from native to vm/java it must suspend
|
|
// if external|deopt suspend is present.
|
|
bool is_suspend_after_native() const {
|
|
return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0;
|
|
}
|
|
|
|
// external suspend request is completed
|
|
bool is_ext_suspended() const {
|
|
return (_suspend_flags & _ext_suspended) != 0;
|
|
}
|
|
|
|
bool is_external_suspend_with_lock() const {
|
|
MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
return is_external_suspend();
|
|
}
|
|
|
|
// Special method to handle a pending external suspend request
|
|
// when a suspend equivalent condition lifts.
|
|
bool handle_special_suspend_equivalent_condition() {
|
|
assert(is_suspend_equivalent(),
|
|
"should only be called in a suspend equivalence condition");
|
|
MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
bool ret = is_external_suspend();
|
|
if (!ret) {
|
|
// not about to self-suspend so clear suspend equivalence
|
|
clear_suspend_equivalent();
|
|
}
|
|
// implied else:
|
|
// We have a pending external suspend request so we leave the
|
|
// suspend_equivalent flag set until java_suspend_self() sets
|
|
// the ext_suspended flag and clears the suspend_equivalent
|
|
// flag. This insures that wait_for_ext_suspend_completion()
|
|
// will return consistent values.
|
|
return ret;
|
|
}
|
|
|
|
// utility methods to see if we are doing some kind of suspension
|
|
bool is_being_ext_suspended() const {
|
|
MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
|
|
return is_ext_suspended() || is_external_suspend();
|
|
}
|
|
|
|
bool is_suspend_equivalent() const { return _suspend_equivalent; }
|
|
|
|
void set_suspend_equivalent() { _suspend_equivalent = true; };
|
|
void clear_suspend_equivalent() { _suspend_equivalent = false; };
|
|
|
|
// Thread.stop support
|
|
void send_thread_stop(oop throwable);
|
|
AsyncRequests clear_special_runtime_exit_condition() {
|
|
AsyncRequests x = _special_runtime_exit_condition;
|
|
_special_runtime_exit_condition = _no_async_condition;
|
|
return x;
|
|
}
|
|
|
|
// Are any async conditions present?
|
|
bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); }
|
|
|
|
void check_and_handle_async_exceptions(bool check_unsafe_error = true);
|
|
|
|
// these next two are also used for self-suspension and async exception support
|
|
void handle_special_runtime_exit_condition(bool check_asyncs = true);
|
|
|
|
// Return true if JavaThread has an asynchronous condition or
|
|
// if external suspension is requested.
|
|
bool has_special_runtime_exit_condition() {
|
|
// We call is_external_suspend() last since external suspend should
|
|
// be less common. Because we don't use is_external_suspend_with_lock
|
|
// it is possible that we won't see an asynchronous external suspend
|
|
// request that has just gotten started, i.e., SR_lock grabbed but
|
|
// _external_suspend field change either not made yet or not visible
|
|
// yet. However, this is okay because the request is asynchronous and
|
|
// we will see the new flag value the next time through. It's also
|
|
// possible that the external suspend request is dropped after
|
|
// we have checked is_external_suspend(), we will recheck its value
|
|
// under SR_lock in java_suspend_self().
|
|
return (_special_runtime_exit_condition != _no_async_condition) ||
|
|
is_external_suspend() || is_deopt_suspend();
|
|
}
|
|
|
|
void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; }
|
|
|
|
void set_pending_async_exception(oop e) {
|
|
_pending_async_exception = e;
|
|
_special_runtime_exit_condition = _async_exception;
|
|
set_has_async_exception();
|
|
}
|
|
|
|
// Fast-locking support
|
|
bool is_lock_owned(address adr) const;
|
|
|
|
// Accessors for vframe array top
|
|
// The linked list of vframe arrays are sorted on sp. This means when we
|
|
// unpack the head must contain the vframe array to unpack.
|
|
void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; }
|
|
vframeArray* vframe_array_head() const { return _vframe_array_head; }
|
|
|
|
// Side structure for defering update of java frame locals until deopt occurs
|
|
GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; }
|
|
void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; }
|
|
|
|
// These only really exist to make debugging deopt problems simpler
|
|
|
|
void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; }
|
|
vframeArray* vframe_array_last() const { return _vframe_array_last; }
|
|
|
|
// The special resourceMark used during deoptimization
|
|
|
|
void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; }
|
|
DeoptResourceMark* deopt_mark(void) { return _deopt_mark; }
|
|
|
|
intptr_t* must_deopt_id() { return _must_deopt_id; }
|
|
void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; }
|
|
void clear_must_deopt_id() { _must_deopt_id = NULL; }
|
|
|
|
void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; }
|
|
nmethod* deopt_nmethod() { return _deopt_nmethod; }
|
|
|
|
methodOop callee_target() const { return _callee_target; }
|
|
void set_callee_target (methodOop x) { _callee_target = x; }
|
|
|
|
// Oop results of vm runtime calls
|
|
oop vm_result() const { return _vm_result; }
|
|
void set_vm_result (oop x) { _vm_result = x; }
|
|
|
|
oop vm_result_2() const { return _vm_result_2; }
|
|
void set_vm_result_2 (oop x) { _vm_result_2 = x; }
|
|
|
|
MemRegion deferred_card_mark() const { return _deferred_card_mark; }
|
|
void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; }
|
|
|
|
// Exception handling for compiled methods
|
|
oop exception_oop() const { return _exception_oop; }
|
|
int exception_stack_size() const { return _exception_stack_size; }
|
|
address exception_pc() const { return _exception_pc; }
|
|
address exception_handler_pc() const { return _exception_handler_pc; }
|
|
bool is_method_handle_return() const { return _is_method_handle_return == 1; }
|
|
|
|
void set_exception_oop(oop o) { _exception_oop = o; }
|
|
void set_exception_pc(address a) { _exception_pc = a; }
|
|
void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
|
|
void set_exception_stack_size(int size) { _exception_stack_size = size; }
|
|
void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
|
|
|
|
// Stack overflow support
|
|
inline size_t stack_available(address cur_sp);
|
|
address stack_yellow_zone_base()
|
|
{ return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); }
|
|
size_t stack_yellow_zone_size()
|
|
{ return StackYellowPages * os::vm_page_size(); }
|
|
address stack_red_zone_base()
|
|
{ return (address)(stack_base() - (stack_size() - stack_red_zone_size())); }
|
|
size_t stack_red_zone_size()
|
|
{ return StackRedPages * os::vm_page_size(); }
|
|
bool in_stack_yellow_zone(address a)
|
|
{ return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); }
|
|
bool in_stack_red_zone(address a)
|
|
{ return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); }
|
|
|
|
void create_stack_guard_pages();
|
|
void remove_stack_guard_pages();
|
|
|
|
void enable_stack_yellow_zone();
|
|
void disable_stack_yellow_zone();
|
|
void enable_stack_red_zone();
|
|
void disable_stack_red_zone();
|
|
|
|
inline bool stack_yellow_zone_disabled();
|
|
inline bool stack_yellow_zone_enabled();
|
|
|
|
// Attempt to reguard the stack after a stack overflow may have occurred.
|
|
// Returns true if (a) guard pages are not needed on this thread, (b) the
|
|
// pages are already guarded, or (c) the pages were successfully reguarded.
|
|
// Returns false if there is not enough stack space to reguard the pages, in
|
|
// which case the caller should unwind a frame and try again. The argument
|
|
// should be the caller's (approximate) sp.
|
|
bool reguard_stack(address cur_sp);
|
|
// Similar to above but see if current stackpoint is out of the guard area
|
|
// and reguard if possible.
|
|
bool reguard_stack(void);
|
|
|
|
// Misc. accessors/mutators
|
|
void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; }
|
|
void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; }
|
|
bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; }
|
|
|
|
#ifndef PRODUCT
|
|
void record_jump(address target, address instr, const char* file, int line);
|
|
#endif /* PRODUCT */
|
|
|
|
// For assembly stub generation
|
|
static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); }
|
|
#ifndef PRODUCT
|
|
static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); }
|
|
static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); }
|
|
#endif /* PRODUCT */
|
|
static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); }
|
|
static ByteSize last_Java_sp_offset() {
|
|
return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset();
|
|
}
|
|
static ByteSize last_Java_pc_offset() {
|
|
return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset();
|
|
}
|
|
static ByteSize frame_anchor_offset() {
|
|
return byte_offset_of(JavaThread, _anchor);
|
|
}
|
|
static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); }
|
|
static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); }
|
|
static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); }
|
|
static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); }
|
|
static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); }
|
|
static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); }
|
|
static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); }
|
|
static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); }
|
|
static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); }
|
|
static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); }
|
|
static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
|
|
static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); }
|
|
static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); }
|
|
|
|
static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); }
|
|
static ByteSize should_post_on_exceptions_flag_offset() {
|
|
return byte_offset_of(JavaThread, _should_post_on_exceptions_flag);
|
|
}
|
|
|
|
#ifndef SERIALGC
|
|
static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); }
|
|
static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); }
|
|
#endif // !SERIALGC
|
|
|
|
// Returns the jni environment for this thread
|
|
JNIEnv* jni_environment() { return &_jni_environment; }
|
|
|
|
static JavaThread* thread_from_jni_environment(JNIEnv* env) {
|
|
JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
|
|
// Only return NULL if thread is off the thread list; starting to
|
|
// exit should not return NULL.
|
|
if (thread_from_jni_env->is_terminated()) {
|
|
thread_from_jni_env->block_if_vm_exited();
|
|
return NULL;
|
|
} else {
|
|
return thread_from_jni_env;
|
|
}
|
|
}
|
|
|
|
// JNI critical regions. These can nest.
|
|
bool in_critical() { return _jni_active_critical > 0; }
|
|
void enter_critical() { assert(Thread::current() == this,
|
|
"this must be current thread");
|
|
_jni_active_critical++; }
|
|
void exit_critical() { assert(Thread::current() == this,
|
|
"this must be current thread");
|
|
_jni_active_critical--;
|
|
assert(_jni_active_critical >= 0,
|
|
"JNI critical nesting problem?"); }
|
|
|
|
// For deadlock detection
|
|
int depth_first_number() { return _depth_first_number; }
|
|
void set_depth_first_number(int dfn) { _depth_first_number = dfn; }
|
|
|
|
private:
|
|
void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; }
|
|
|
|
public:
|
|
MonitorChunk* monitor_chunks() const { return _monitor_chunks; }
|
|
void add_monitor_chunk(MonitorChunk* chunk);
|
|
void remove_monitor_chunk(MonitorChunk* chunk);
|
|
bool in_deopt_handler() const { return _in_deopt_handler > 0; }
|
|
void inc_in_deopt_handler() { _in_deopt_handler++; }
|
|
void dec_in_deopt_handler() {
|
|
assert(_in_deopt_handler > 0, "mismatched deopt nesting");
|
|
if (_in_deopt_handler > 0) { // robustness
|
|
_in_deopt_handler--;
|
|
}
|
|
}
|
|
|
|
private:
|
|
void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; }
|
|
|
|
public:
|
|
|
|
// Frame iteration; calls the function f for all frames on the stack
|
|
void frames_do(void f(frame*, const RegisterMap*));
|
|
|
|
// Memory operations
|
|
void oops_do(OopClosure* f, CodeBlobClosure* cf);
|
|
|
|
// Sweeper operations
|
|
void nmethods_do(CodeBlobClosure* cf);
|
|
|
|
// Memory management operations
|
|
void gc_epilogue();
|
|
void gc_prologue();
|
|
|
|
// Misc. operations
|
|
char* name() const { return (char*)get_thread_name(); }
|
|
void print_on(outputStream* st) const;
|
|
void print() const { print_on(tty); }
|
|
void print_value();
|
|
void print_thread_state_on(outputStream* ) const PRODUCT_RETURN;
|
|
void print_thread_state() const PRODUCT_RETURN;
|
|
void print_on_error(outputStream* st, char* buf, int buflen) const;
|
|
void verify();
|
|
const char* get_thread_name() const;
|
|
private:
|
|
// factor out low-level mechanics for use in both normal and error cases
|
|
const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const;
|
|
public:
|
|
const char* get_threadgroup_name() const;
|
|
const char* get_parent_name() const;
|
|
|
|
// Accessing frames
|
|
frame last_frame() {
|
|
_anchor.make_walkable(this);
|
|
return pd_last_frame();
|
|
}
|
|
javaVFrame* last_java_vframe(RegisterMap* reg_map);
|
|
|
|
// Returns method at 'depth' java or native frames down the stack
|
|
// Used for security checks
|
|
klassOop security_get_caller_class(int depth);
|
|
|
|
// Print stack trace in external format
|
|
void print_stack_on(outputStream* st);
|
|
void print_stack() { print_stack_on(tty); }
|
|
|
|
// Print stack traces in various internal formats
|
|
void trace_stack() PRODUCT_RETURN;
|
|
void trace_stack_from(vframe* start_vf) PRODUCT_RETURN;
|
|
void trace_frames() PRODUCT_RETURN;
|
|
|
|
// Returns the number of stack frames on the stack
|
|
int depth() const;
|
|
|
|
// Function for testing deoptimization
|
|
void deoptimize();
|
|
void make_zombies();
|
|
|
|
void deoptimized_wrt_marked_nmethods();
|
|
|
|
// Profiling operation (see fprofile.cpp)
|
|
public:
|
|
bool profile_last_Java_frame(frame* fr);
|
|
|
|
private:
|
|
ThreadProfiler* _thread_profiler;
|
|
private:
|
|
friend class FlatProfiler; // uses both [gs]et_thread_profiler.
|
|
friend class FlatProfilerTask; // uses get_thread_profiler.
|
|
friend class ThreadProfilerMark; // uses get_thread_profiler.
|
|
ThreadProfiler* get_thread_profiler() { return _thread_profiler; }
|
|
ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) {
|
|
ThreadProfiler* result = _thread_profiler;
|
|
_thread_profiler = tp;
|
|
return result;
|
|
}
|
|
|
|
// Static operations
|
|
public:
|
|
// Returns the running thread as a JavaThread
|
|
static inline JavaThread* current();
|
|
|
|
// Returns the active Java thread. Do not use this if you know you are calling
|
|
// from a JavaThread, as it's slower than JavaThread::current. If called from
|
|
// the VMThread, it also returns the JavaThread that instigated the VMThread's
|
|
// operation. You may not want that either.
|
|
static JavaThread* active();
|
|
|
|
inline CompilerThread* as_CompilerThread();
|
|
|
|
public:
|
|
virtual void run();
|
|
void thread_main_inner();
|
|
|
|
private:
|
|
// PRIVILEGED STACK
|
|
PrivilegedElement* _privileged_stack_top;
|
|
GrowableArray<oop>* _array_for_gc;
|
|
public:
|
|
|
|
// Returns the privileged_stack information.
|
|
PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; }
|
|
void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; }
|
|
void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; }
|
|
|
|
public:
|
|
// Thread local information maintained by JVMTI.
|
|
void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; }
|
|
// A JvmtiThreadState is lazily allocated. This jvmti_thread_state()
|
|
// getter is used to get this JavaThread's JvmtiThreadState if it has
|
|
// one which means NULL can be returned. JvmtiThreadState::state_for()
|
|
// is used to get the specified JavaThread's JvmtiThreadState if it has
|
|
// one or it allocates a new JvmtiThreadState for the JavaThread and
|
|
// returns it. JvmtiThreadState::state_for() will return NULL only if
|
|
// the specified JavaThread is exiting.
|
|
JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; }
|
|
static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); }
|
|
void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; }
|
|
JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; }
|
|
|
|
// JVMTI PopFrame support
|
|
// Setting and clearing popframe_condition
|
|
// All of these enumerated values are bits. popframe_pending
|
|
// indicates that a PopFrame() has been requested and not yet been
|
|
// completed. popframe_processing indicates that that PopFrame() is in
|
|
// the process of being completed. popframe_force_deopt_reexecution_bit
|
|
// indicates that special handling is required when returning to a
|
|
// deoptimized caller.
|
|
enum PopCondition {
|
|
popframe_inactive = 0x00,
|
|
popframe_pending_bit = 0x01,
|
|
popframe_processing_bit = 0x02,
|
|
popframe_force_deopt_reexecution_bit = 0x04
|
|
};
|
|
PopCondition popframe_condition() { return (PopCondition) _popframe_condition; }
|
|
void set_popframe_condition(PopCondition c) { _popframe_condition = c; }
|
|
void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; }
|
|
void clear_popframe_condition() { _popframe_condition = popframe_inactive; }
|
|
static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); }
|
|
bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; }
|
|
bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; }
|
|
void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; }
|
|
#ifdef CC_INTERP
|
|
bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); }
|
|
void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; }
|
|
bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); }
|
|
void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; }
|
|
void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; }
|
|
#endif
|
|
|
|
private:
|
|
// Saved incoming arguments to popped frame.
|
|
// Used only when popped interpreted frame returns to deoptimized frame.
|
|
void* _popframe_preserved_args;
|
|
int _popframe_preserved_args_size;
|
|
|
|
public:
|
|
void popframe_preserve_args(ByteSize size_in_bytes, void* start);
|
|
void* popframe_preserved_args();
|
|
ByteSize popframe_preserved_args_size();
|
|
WordSize popframe_preserved_args_size_in_words();
|
|
void popframe_free_preserved_args();
|
|
|
|
|
|
private:
|
|
JvmtiThreadState *_jvmti_thread_state;
|
|
JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure;
|
|
|
|
// Used by the interpreter in fullspeed mode for frame pop, method
|
|
// entry, method exit and single stepping support. This field is
|
|
// only set to non-zero by the VM_EnterInterpOnlyMode VM operation.
|
|
// It can be set to zero asynchronously (i.e., without a VM operation
|
|
// or a lock) so we have to be very careful.
|
|
int _interp_only_mode;
|
|
|
|
public:
|
|
// used by the interpreter for fullspeed debugging support (see above)
|
|
static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); }
|
|
bool is_interp_only_mode() { return (_interp_only_mode != 0); }
|
|
int get_interp_only_mode() { return _interp_only_mode; }
|
|
void increment_interp_only_mode() { ++_interp_only_mode; }
|
|
void decrement_interp_only_mode() { --_interp_only_mode; }
|
|
|
|
// support for cached flag that indicates whether exceptions need to be posted for this thread
|
|
// if this is false, we can avoid deoptimizing when events are thrown
|
|
// this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything
|
|
private:
|
|
int _should_post_on_exceptions_flag;
|
|
|
|
public:
|
|
int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; }
|
|
void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; }
|
|
|
|
private:
|
|
ThreadStatistics *_thread_stat;
|
|
|
|
public:
|
|
ThreadStatistics* get_thread_stat() const { return _thread_stat; }
|
|
|
|
// Return a blocker object for which this thread is blocked parking.
|
|
oop current_park_blocker();
|
|
|
|
private:
|
|
static size_t _stack_size_at_create;
|
|
|
|
public:
|
|
static inline size_t stack_size_at_create(void) {
|
|
return _stack_size_at_create;
|
|
}
|
|
static inline void set_stack_size_at_create(size_t value) {
|
|
_stack_size_at_create = value;
|
|
}
|
|
|
|
#ifndef SERIALGC
|
|
// SATB marking queue support
|
|
ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; }
|
|
static SATBMarkQueueSet& satb_mark_queue_set() {
|
|
return _satb_mark_queue_set;
|
|
}
|
|
|
|
// Dirty card queue support
|
|
DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; }
|
|
static DirtyCardQueueSet& dirty_card_queue_set() {
|
|
return _dirty_card_queue_set;
|
|
}
|
|
#endif // !SERIALGC
|
|
|
|
// This method initializes the SATB and dirty card queues before a
|
|
// JavaThread is added to the Java thread list. Right now, we don't
|
|
// have to do anything to the dirty card queue (it should have been
|
|
// activated when the thread was created), but we have to activate
|
|
// the SATB queue if the thread is created while a marking cycle is
|
|
// in progress. The activation / de-activation of the SATB queues at
|
|
// the beginning / end of a marking cycle is done during safepoints
|
|
// so we have to make sure this method is called outside one to be
|
|
// able to safely read the active field of the SATB queue set. Right
|
|
// now, it is called just before the thread is added to the Java
|
|
// thread list in the Threads::add() method. That method is holding
|
|
// the Threads_lock which ensures we are outside a safepoint. We
|
|
// cannot do the obvious and set the active field of the SATB queue
|
|
// when the thread is created given that, in some cases, safepoints
|
|
// might happen between the JavaThread constructor being called and the
|
|
// thread being added to the Java thread list (an example of this is
|
|
// when the structure for the DestroyJavaVM thread is created).
|
|
#ifndef SERIALGC
|
|
void initialize_queues();
|
|
#else // !SERIALGC
|
|
void initialize_queues() { }
|
|
#endif // !SERIALGC
|
|
|
|
// Machine dependent stuff
|
|
#include "incls/_thread_pd.hpp.incl"
|
|
|
|
public:
|
|
void set_blocked_on_compilation(bool value) {
|
|
_blocked_on_compilation = value;
|
|
}
|
|
|
|
bool blocked_on_compilation() {
|
|
return _blocked_on_compilation;
|
|
}
|
|
protected:
|
|
bool _blocked_on_compilation;
|
|
|
|
|
|
// JSR166 per-thread parker
|
|
private:
|
|
Parker* _parker;
|
|
public:
|
|
Parker* parker() { return _parker; }
|
|
|
|
// Biased locking support
|
|
private:
|
|
GrowableArray<MonitorInfo*>* _cached_monitor_info;
|
|
public:
|
|
GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; }
|
|
void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; }
|
|
|
|
// clearing/querying jni attach status
|
|
bool is_attaching() const { return _is_attaching; }
|
|
void set_attached() { _is_attaching = false; OrderAccess::fence(); }
|
|
private:
|
|
// This field is used to determine if a thread has claimed
|
|
// a par_id: it is -1 if the thread has not claimed a par_id;
|
|
// otherwise its value is the par_id that has been claimed.
|
|
int _claimed_par_id;
|
|
public:
|
|
int get_claimed_par_id() { return _claimed_par_id; }
|
|
void set_claimed_par_id(int id) { _claimed_par_id = id;}
|
|
};
|
|
|
|
// Inline implementation of JavaThread::current
|
|
inline JavaThread* JavaThread::current() {
|
|
Thread* thread = ThreadLocalStorage::thread();
|
|
assert(thread != NULL && thread->is_Java_thread(), "just checking");
|
|
return (JavaThread*)thread;
|
|
}
|
|
|
|
inline CompilerThread* JavaThread::as_CompilerThread() {
|
|
assert(is_Compiler_thread(), "just checking");
|
|
return (CompilerThread*)this;
|
|
}
|
|
|
|
inline bool JavaThread::stack_yellow_zone_disabled() {
|
|
return _stack_guard_state == stack_guard_yellow_disabled;
|
|
}
|
|
|
|
inline bool JavaThread::stack_yellow_zone_enabled() {
|
|
#ifdef ASSERT
|
|
if (os::uses_stack_guard_pages()) {
|
|
assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use");
|
|
}
|
|
#endif
|
|
return _stack_guard_state == stack_guard_enabled;
|
|
}
|
|
|
|
inline size_t JavaThread::stack_available(address cur_sp) {
|
|
// This code assumes java stacks grow down
|
|
address low_addr; // Limit on the address for deepest stack depth
|
|
if ( _stack_guard_state == stack_guard_unused) {
|
|
low_addr = stack_base() - stack_size();
|
|
} else {
|
|
low_addr = stack_yellow_zone_base();
|
|
}
|
|
return cur_sp > low_addr ? cur_sp - low_addr : 0;
|
|
}
|
|
|
|
// A JavaThread for low memory detection support
|
|
class LowMemoryDetectorThread : public JavaThread {
|
|
friend class VMStructs;
|
|
public:
|
|
LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {};
|
|
|
|
// Hide this thread from external view.
|
|
bool is_hidden_from_external_view() const { return true; }
|
|
};
|
|
|
|
// A thread used for Compilation.
|
|
class CompilerThread : public JavaThread {
|
|
friend class VMStructs;
|
|
private:
|
|
CompilerCounters* _counters;
|
|
|
|
ciEnv* _env;
|
|
CompileLog* _log;
|
|
CompileTask* _task;
|
|
CompileQueue* _queue;
|
|
BufferBlob* _buffer_blob;
|
|
|
|
public:
|
|
|
|
static CompilerThread* current();
|
|
|
|
CompilerThread(CompileQueue* queue, CompilerCounters* counters);
|
|
|
|
bool is_Compiler_thread() const { return true; }
|
|
// Hide this compiler thread from external view.
|
|
bool is_hidden_from_external_view() const { return true; }
|
|
|
|
CompileQueue* queue() { return _queue; }
|
|
CompilerCounters* counters() { return _counters; }
|
|
|
|
// Get/set the thread's compilation environment.
|
|
ciEnv* env() { return _env; }
|
|
void set_env(ciEnv* env) { _env = env; }
|
|
|
|
BufferBlob* get_buffer_blob() { return _buffer_blob; }
|
|
void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; };
|
|
|
|
// Get/set the thread's logging information
|
|
CompileLog* log() { return _log; }
|
|
void init_log(CompileLog* log) {
|
|
// Set once, for good.
|
|
assert(_log == NULL, "set only once");
|
|
_log = log;
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
private:
|
|
IdealGraphPrinter *_ideal_graph_printer;
|
|
public:
|
|
IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; }
|
|
void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; }
|
|
#endif
|
|
|
|
// Get/set the thread's current task
|
|
CompileTask* task() { return _task; }
|
|
void set_task(CompileTask* task) { _task = task; }
|
|
};
|
|
|
|
inline CompilerThread* CompilerThread::current() {
|
|
return JavaThread::current()->as_CompilerThread();
|
|
}
|
|
|
|
|
|
// The active thread queue. It also keeps track of the current used
|
|
// thread priorities.
|
|
class Threads: AllStatic {
|
|
friend class VMStructs;
|
|
private:
|
|
static JavaThread* _thread_list;
|
|
static int _number_of_threads;
|
|
static int _number_of_non_daemon_threads;
|
|
static int _return_code;
|
|
|
|
public:
|
|
// Thread management
|
|
// force_daemon is a concession to JNI, where we may need to add a
|
|
// thread to the thread list before allocating its thread object
|
|
static void add(JavaThread* p, bool force_daemon = false);
|
|
static void remove(JavaThread* p);
|
|
static bool includes(JavaThread* p);
|
|
static JavaThread* first() { return _thread_list; }
|
|
static void threads_do(ThreadClosure* tc);
|
|
|
|
// Initializes the vm and creates the vm thread
|
|
static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain);
|
|
static void convert_vm_init_libraries_to_agents();
|
|
static void create_vm_init_libraries();
|
|
static void create_vm_init_agents();
|
|
static void shutdown_vm_agents();
|
|
static bool destroy_vm();
|
|
// Supported VM versions via JNI
|
|
// Includes JNI_VERSION_1_1
|
|
static jboolean is_supported_jni_version_including_1_1(jint version);
|
|
// Does not include JNI_VERSION_1_1
|
|
static jboolean is_supported_jni_version(jint version);
|
|
|
|
// Garbage collection
|
|
static void follow_other_roots(void f(oop*));
|
|
|
|
// Apply "f->do_oop" to all root oops in all threads.
|
|
// This version may only be called by sequential code.
|
|
static void oops_do(OopClosure* f, CodeBlobClosure* cf);
|
|
// This version may be called by sequential or parallel code.
|
|
static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf);
|
|
// This creates a list of GCTasks, one per thread.
|
|
static void create_thread_roots_tasks(GCTaskQueue* q);
|
|
// This creates a list of GCTasks, one per thread, for marking objects.
|
|
static void create_thread_roots_marking_tasks(GCTaskQueue* q);
|
|
|
|
// Apply "f->do_oop" to roots in all threads that
|
|
// are part of compiled frames
|
|
static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf);
|
|
|
|
static void convert_hcode_pointers();
|
|
static void restore_hcode_pointers();
|
|
|
|
// Sweeper
|
|
static void nmethods_do(CodeBlobClosure* cf);
|
|
|
|
static void gc_epilogue();
|
|
static void gc_prologue();
|
|
|
|
// Verification
|
|
static void verify();
|
|
static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks);
|
|
static void print(bool print_stacks, bool internal_format) {
|
|
// this function is only used by debug.cpp
|
|
print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */);
|
|
}
|
|
static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen);
|
|
|
|
// Get Java threads that are waiting to enter a monitor. If doLock
|
|
// is true, then Threads_lock is grabbed as needed. Otherwise, the
|
|
// VM needs to be at a safepoint.
|
|
static GrowableArray<JavaThread*>* get_pending_threads(int count,
|
|
address monitor, bool doLock);
|
|
|
|
// Get owning Java thread from the monitor's owner field. If doLock
|
|
// is true, then Threads_lock is grabbed as needed. Otherwise, the
|
|
// VM needs to be at a safepoint.
|
|
static JavaThread *owning_thread_from_monitor_owner(address owner,
|
|
bool doLock);
|
|
|
|
// Number of threads on the active threads list
|
|
static int number_of_threads() { return _number_of_threads; }
|
|
// Number of non-daemon threads on the active threads list
|
|
static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; }
|
|
|
|
// Deoptimizes all frames tied to marked nmethods
|
|
static void deoptimized_wrt_marked_nmethods();
|
|
|
|
};
|
|
|
|
|
|
// Thread iterator
|
|
class ThreadClosure: public StackObj {
|
|
public:
|
|
virtual void do_thread(Thread* thread) = 0;
|
|
};
|
|
|
|
class SignalHandlerMark: public StackObj {
|
|
private:
|
|
Thread* _thread;
|
|
public:
|
|
SignalHandlerMark(Thread* t) {
|
|
_thread = t;
|
|
if (_thread) _thread->enter_signal_handler();
|
|
}
|
|
~SignalHandlerMark() {
|
|
if (_thread) _thread->leave_signal_handler();
|
|
_thread = NULL;
|
|
}
|
|
};
|
|
|
|
// ParkEvents are type-stable and immortal.
|
|
//
|
|
// Lifecycle: Once a ParkEvent is associated with a thread that ParkEvent remains
|
|
// associated with the thread for the thread's entire lifetime - the relationship is
|
|
// stable. A thread will be associated at most one ParkEvent. When the thread
|
|
// expires, the ParkEvent moves to the EventFreeList. New threads attempt to allocate from
|
|
// the EventFreeList before creating a new Event. Type-stability frees us from
|
|
// worrying about stale Event or Thread references in the objectMonitor subsystem.
|
|
// (A reference to ParkEvent is always valid, even though the event may no longer be associated
|
|
// with the desired or expected thread. A key aspect of this design is that the callers of
|
|
// park, unpark, etc must tolerate stale references and spurious wakeups).
|
|
//
|
|
// Only the "associated" thread can block (park) on the ParkEvent, although
|
|
// any other thread can unpark a reachable parkevent. Park() is allowed to
|
|
// return spuriously. In fact park-unpark a really just an optimization to
|
|
// avoid unbounded spinning and surrender the CPU to be a polite system citizen.
|
|
// A degenerate albeit "impolite" park-unpark implementation could simply return.
|
|
// See http://blogs.sun.com/dave for more details.
|
|
//
|
|
// Eventually I'd like to eliminate Events and ObjectWaiters, both of which serve as
|
|
// thread proxies, and simply make the THREAD structure type-stable and persistent.
|
|
// Currently, we unpark events associated with threads, but ideally we'd just
|
|
// unpark threads.
|
|
//
|
|
// The base-class, PlatformEvent, is platform-specific while the ParkEvent is
|
|
// platform-independent. PlatformEvent provides park(), unpark(), etc., and
|
|
// is abstract -- that is, a PlatformEvent should never be instantiated except
|
|
// as part of a ParkEvent.
|
|
// Equivalently we could have defined a platform-independent base-class that
|
|
// exported Allocate(), Release(), etc. The platform-specific class would extend
|
|
// that base-class, adding park(), unpark(), etc.
|
|
//
|
|
// A word of caution: The JVM uses 2 very similar constructs:
|
|
// 1. ParkEvent are used for Java-level "monitor" synchronization.
|
|
// 2. Parkers are used by JSR166-JUC park-unpark.
|
|
//
|
|
// We'll want to eventually merge these redundant facilities and use ParkEvent.
|
|
|
|
|
|
class ParkEvent : public os::PlatformEvent {
|
|
private:
|
|
ParkEvent * FreeNext ;
|
|
|
|
// Current association
|
|
Thread * AssociatedWith ;
|
|
intptr_t RawThreadIdentity ; // LWPID etc
|
|
volatile int Incarnation ;
|
|
|
|
// diagnostic : keep track of last thread to wake this thread.
|
|
// this is useful for construction of dependency graphs.
|
|
void * LastWaker ;
|
|
|
|
public:
|
|
// MCS-CLH list linkage and Native Mutex/Monitor
|
|
ParkEvent * volatile ListNext ;
|
|
ParkEvent * volatile ListPrev ;
|
|
volatile intptr_t OnList ;
|
|
volatile int TState ;
|
|
volatile int Notified ; // for native monitor construct
|
|
volatile int IsWaiting ; // Enqueued on WaitSet
|
|
|
|
|
|
private:
|
|
static ParkEvent * volatile FreeList ;
|
|
static volatile int ListLock ;
|
|
|
|
// It's prudent to mark the dtor as "private"
|
|
// ensuring that it's not visible outside the package.
|
|
// Unfortunately gcc warns about such usage, so
|
|
// we revert to the less desirable "protected" visibility.
|
|
// The other compilers accept private dtors.
|
|
|
|
protected: // Ensure dtor is never invoked
|
|
~ParkEvent() { guarantee (0, "invariant") ; }
|
|
|
|
ParkEvent() : PlatformEvent() {
|
|
AssociatedWith = NULL ;
|
|
FreeNext = NULL ;
|
|
ListNext = NULL ;
|
|
ListPrev = NULL ;
|
|
OnList = 0 ;
|
|
TState = 0 ;
|
|
Notified = 0 ;
|
|
IsWaiting = 0 ;
|
|
}
|
|
|
|
// We use placement-new to force ParkEvent instances to be
|
|
// aligned on 256-byte address boundaries. This ensures that the least
|
|
// significant byte of a ParkEvent address is always 0.
|
|
|
|
void * operator new (size_t sz) ;
|
|
void operator delete (void * a) ;
|
|
|
|
public:
|
|
static ParkEvent * Allocate (Thread * t) ;
|
|
static void Release (ParkEvent * e) ;
|
|
} ;
|