/*
* Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2021, Azul Systems, Inc. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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#ifndef SHARE_RUNTIME_JAVATHREAD_HPP
#define SHARE_RUNTIME_JAVATHREAD_HPP
#include "jni.h"
#include "memory/allocation.hpp"
#include "oops/oop.hpp"
#include "oops/oopHandle.hpp"
#include "runtime/frame.hpp"
#include "runtime/globals.hpp"
#include "runtime/handshake.hpp"
#include "runtime/javaFrameAnchor.hpp"
#include "runtime/park.hpp"
#include "runtime/safepointMechanism.hpp"
#include "runtime/stackWatermarkSet.hpp"
#include "runtime/stackOverflow.hpp"
#include "runtime/thread.hpp"
#include "runtime/threadHeapSampler.hpp"
#include "runtime/threadStatisticalInfo.hpp"
#include "utilities/exceptions.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/macros.hpp"
#if INCLUDE_JFR
#include "jfr/support/jfrThreadExtension.hpp"
#endif
class AsyncExceptionHandshake;
class ContinuationEntry;
class DeoptResourceMark;
class JNIHandleBlock;
class JVMCIRuntime;
class JvmtiDeferredUpdates;
class JvmtiSampledObjectAllocEventCollector;
class JvmtiThreadState;
class Metadata;
class OopHandleList;
class OopStorage;
class OSThread;
class ThreadsList;
class ThreadSafepointState;
class ThreadStatistics;
class vframeArray;
class vframe;
class javaVFrame;
class JavaThread;
typedef void (*ThreadFunction)(JavaThread*, TRAPS);
class JavaThread: public Thread {
friend class VMStructs;
friend class JVMCIVMStructs;
friend class WhiteBox;
friend class ThreadsSMRSupport; // to access _threadObj for exiting_threads_oops_do
friend class HandshakeState;
friend class Continuation;
friend class Threads;
friend class ServiceThread; // for deferred OopHandle release access
private:
bool _on_thread_list; // Is set when this JavaThread is added to the Threads list
// All references to Java objects managed via OopHandles. These
// have to be released by the ServiceThread after the JavaThread has
// terminated - see add_oop_handles_for_release().
OopHandle _threadObj; // The Java level thread object
OopHandle _vthread; // the value returned by Thread.currentThread(): the virtual thread, if mounted, otherwise _threadObj
OopHandle _jvmti_vthread;
OopHandle _scopedValueCache;
static OopStorage* _thread_oop_storage;
#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
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
CompiledMethod* _deopt_nmethod; // CompiledMethod 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
// Holds updates by JVMTI agents for compiled frames that cannot be performed immediately. They
// will be carried out as soon as possible which, in most cases, is just before deoptimization of
// the frame, when control returns to it.
JvmtiDeferredUpdates* _jvmti_deferred_updates;
// Handshake value for fixing 6243940. We need a place for the i2c
// adapter to store the callee Method*. 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.
Method* _callee_target;
// Used to pass back results to the interpreter or generated code running Java code.
oop _vm_result; // oop result is GC-preserved
Metadata* _vm_result_2; // non-oop result
// 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;
ObjectMonitor* volatile _current_pending_monitor; // ObjectMonitor this thread is waiting to lock
bool _current_pending_monitor_is_from_java; // locking is from Java code
ObjectMonitor* volatile _current_waiting_monitor; // ObjectMonitor on which this thread called Object.wait()
// Active_handles points to a block of handles
JNIHandleBlock* _active_handles;
// One-element thread local free list
JNIHandleBlock* _free_handle_block;
public:
volatile intptr_t _Stalled;
// For tracking the heavyweight monitor the thread is pending on.
ObjectMonitor* current_pending_monitor() {
// Use Atomic::load() to prevent data race between concurrent modification and
// concurrent readers, e.g. ThreadService::get_current_contended_monitor().
// Especially, reloading pointer from thread after NULL check must be prevented.
return Atomic::load(&_current_pending_monitor);
}
void set_current_pending_monitor(ObjectMonitor* monitor) {
Atomic::store(&_current_pending_monitor, monitor);
}
void set_current_pending_monitor_is_from_java(bool from_java) {
_current_pending_monitor_is_from_java = from_java;
}
bool current_pending_monitor_is_from_java() {
return _current_pending_monitor_is_from_java;
}
ObjectMonitor* current_waiting_monitor() {
// See the comment in current_pending_monitor() above.
return Atomic::load(&_current_waiting_monitor);
}
void set_current_waiting_monitor(ObjectMonitor* monitor) {
Atomic::store(&_current_waiting_monitor, monitor);
}
// JNI handle support
JNIHandleBlock* active_handles() const { return _active_handles; }
void set_active_handles(JNIHandleBlock* block) { _active_handles = block; }
JNIHandleBlock* free_handle_block() const { return _free_handle_block; }
void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; }
void push_jni_handle_block();
void pop_jni_handle_block();
private:
MonitorChunk* _monitor_chunks; // Contains the off stack monitors
// allocated during deoptimization
// and by JNI_MonitorEnter/Exit
enum SuspendFlags {
// NOTE: avoid using the sign-bit as cc generates different test code
// when the sign-bit is used, and sometimes incorrectly - see CR 6398077
_trace_flag = 0x00000004U, // call tracing backend
_obj_deopt = 0x00000008U // suspend for object reallocation and relocking for JVMTI agent
};
// various suspension related flags - atomically updated
volatile uint32_t _suspend_flags;
inline void set_suspend_flag(SuspendFlags f);
inline void clear_suspend_flag(SuspendFlags f);
public:
inline void set_trace_flag();
inline void clear_trace_flag();
inline void set_obj_deopt_flag();
inline void clear_obj_deopt_flag();
bool is_trace_suspend() { return (_suspend_flags & _trace_flag) != 0; }
bool is_obj_deopt_suspend() { return (_suspend_flags & _obj_deopt) != 0; }
// Asynchronous exception support
private:
friend class InstallAsyncExceptionHandshake;
friend class AsyncExceptionHandshake;
friend class HandshakeState;
void install_async_exception(AsyncExceptionHandshake* aec = NULL);
void handle_async_exception(oop java_throwable);
public:
bool has_async_exception_condition();
inline void set_pending_unsafe_access_error();
static void send_async_exception(JavaThread* jt, oop java_throwable);
class NoAsyncExceptionDeliveryMark : public StackObj {
friend JavaThread;
JavaThread *_target;
inline NoAsyncExceptionDeliveryMark(JavaThread *t);
inline ~NoAsyncExceptionDeliveryMark();
};
// Safepoint support
public: // Expose _thread_state for SafeFetchInt()
volatile JavaThreadState _thread_state;
private:
SafepointMechanism::ThreadData _poll_data;
ThreadSafepointState* _safepoint_state; // Holds information about a thread during a safepoint
address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened
NOT_PRODUCT(bool _requires_cross_modify_fence;) // State used by VerifyCrossModifyFence
#ifdef ASSERT
// Debug support for checking if code allows safepoints or not.
// Safepoints in the VM can happen because of allocation, invoking a VM operation, or blocking on
// mutex, or blocking on an object synchronizer (Java locking).
// If _no_safepoint_count is non-zero, then an assertion failure will happen in any of
// the above cases. The class NoSafepointVerifier is used to set this counter.
int _no_safepoint_count; // If 0, thread allow a safepoint to happen
public:
void inc_no_safepoint_count() { _no_safepoint_count++; }
void dec_no_safepoint_count() { _no_safepoint_count--; }
#endif // ASSERT
public:
// These functions check conditions before possibly going to a safepoint.
// including NoSafepointVerifier.
void check_for_valid_safepoint_state() NOT_DEBUG_RETURN;
void check_possible_safepoint() NOT_DEBUG_RETURN;
#ifdef ASSERT
private:
volatile uint64_t _visited_for_critical_count;
public:
void set_visited_for_critical_count(uint64_t safepoint_id) {
assert(_visited_for_critical_count == 0, "Must be reset before set");
assert((safepoint_id & 0x1) == 1, "Must be odd");
_visited_for_critical_count = safepoint_id;
}
void reset_visited_for_critical_count(uint64_t safepoint_id) {
assert(_visited_for_critical_count == safepoint_id, "Was not visited");
_visited_for_critical_count = 0;
}
bool was_visited_for_critical_count(uint64_t safepoint_id) const {
return _visited_for_critical_count == safepoint_id;
}
#endif // ASSERT
// JavaThread termination support
public:
enum TerminatedTypes {
_not_terminated = 0xDEAD - 3,
_thread_exiting, // JavaThread::exit() has been called for this thread
_thread_gc_barrier_detached, // thread's GC barrier has been detached
_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
};
private:
// In general a JavaThread's _terminated field transitions as follows:
//
// _not_terminated => _thread_exiting => _thread_gc_barrier_detached => _thread_terminated
//
// _vm_exited is a special value to cover the case of a JavaThread
// executing native code after the VM itself is terminated.
//
// A JavaThread that fails to JNI attach has these _terminated field transitions:
// _not_terminated => _thread_terminated
//
volatile TerminatedTypes _terminated;
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.
#if INCLUDE_JVMTI
volatile bool _carrier_thread_suspended; // Carrier thread is externally suspended
bool _is_in_VTMS_transition; // thread is in virtual thread mount state transition
bool _is_in_tmp_VTMS_transition; // thread is in temporary virtual thread mount state transition
#ifdef ASSERT
bool _is_VTMS_transition_disabler; // thread currently disabled VTMS transitions
#endif
#endif
// JNI attach states:
enum JNIAttachStates {
_not_attaching_via_jni = 1, // thread is not attaching via JNI
_attaching_via_jni, // thread is attaching via JNI
_attached_via_jni // thread has attached via JNI
};
// A regular JavaThread's _jni_attach_state is _not_attaching_via_jni.
// A native thread that is attaching via JNI starts with a value
// of _attaching_via_jni and transitions to _attached_via_jni.
volatile JNIAttachStates _jni_attach_state;
#if INCLUDE_JVMCI
// The _pending_* fields below are used to communicate extra information
// from an uncommon trap in JVMCI compiled code to the uncommon trap handler.
// Communicates the DeoptReason and DeoptAction of the uncommon trap
int _pending_deoptimization;
// Specifies whether the uncommon trap is to bci 0 of a synchronized method
// before the monitor has been acquired.
bool _pending_monitorenter;
// Specifies if the DeoptReason for the last uncommon trap was Reason_transfer_to_interpreter
bool _pending_transfer_to_interpreter;
// True if in a runtime call from compiled code that will deoptimize
// and re-execute a failed heap allocation in the interpreter.
bool _in_retryable_allocation;
// An id of a speculation that JVMCI compiled code can use to further describe and
// uniquely identify the speculative optimization guarded by an uncommon trap.
// See JVMCINMethodData::SPECULATION_LENGTH_BITS for further details.
jlong _pending_failed_speculation;
// These fields are mutually exclusive in terms of live ranges.
union {
// Communicates the pc at which the most recent implicit exception occurred
// from the signal handler to a deoptimization stub.
address _implicit_exception_pc;
// Communicates an alternative call target to an i2c stub from a JavaCall .
address _alternate_call_target;
} _jvmci;
// The JVMCIRuntime in a JVMCI shared library
JVMCIRuntime* _libjvmci_runtime;
// Support for high precision, thread sensitive counters in JVMCI compiled code.
jlong* _jvmci_counters;
// Fast thread locals for use by JVMCI
jlong _jvmci_reserved0;
jlong _jvmci_reserved1;
oop _jvmci_reserved_oop0;
public:
static jlong* _jvmci_old_thread_counters;
static void collect_counters(jlong* array, int length);
bool resize_counters(int current_size, int new_size);
static bool resize_all_jvmci_counters(int new_size);
void set_jvmci_reserved_oop0(oop value) {
_jvmci_reserved_oop0 = value;
}
oop get_jvmci_reserved_oop0() {
return _jvmci_reserved_oop0;
}
void set_jvmci_reserved0(jlong value) {
_jvmci_reserved0 = value;
}
jlong get_jvmci_reserved0() {
return _jvmci_reserved0;
}
void set_jvmci_reserved1(jlong value) {
_jvmci_reserved1 = value;
}
jlong get_jvmci_reserved1() {
return _jvmci_reserved1;
}
private:
#endif // INCLUDE_JVMCI
StackOverflow _stack_overflow_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 _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site.
private:
// support for JNI critical regions
jint _jni_active_critical; // count of entries into JNI critical region
// Checked JNI: function name requires exception check
char* _pending_jni_exception_check_fn;
// 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;
// If reallocation of scalar replaced objects fails, we throw OOM
// and during exception propagation, pop the top
// _frames_to_pop_failed_realloc frames, the ones that reference
// failed reallocations.
int _frames_to_pop_failed_realloc;
ContinuationEntry* _cont_entry;
intptr_t* _cont_fastpath; // the sp of the oldest known interpreted/call_stub frame inside the
// continuation that we know about
int _cont_fastpath_thread_state; // whether global thread state allows continuation fastpath (JVMTI)
// It's signed for error detection.
#ifdef _LP64
int64_t _held_monitor_count; // used by continuations for fast lock detection
int64_t _jni_monitor_count;
#else
int32_t _held_monitor_count; // used by continuations for fast lock detection
int32_t _jni_monitor_count;
#endif
private:
friend class VMThread;
friend class ThreadWaitTransition;
friend class VM_Exit;
// Stack watermark barriers.
StackWatermarks _stack_watermarks;
public:
inline StackWatermarks* stack_watermarks() { return &_stack_watermarks; }
public:
// Constructor
JavaThread(); // delegating constructor
JavaThread(bool is_attaching_via_jni); // 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 // ASSERT
StackOverflow* stack_overflow_state() { return &_stack_overflow_state; }
//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(bool is_daemon);
// Testers
virtual bool is_Java_thread() const { return true; }
virtual bool can_call_java() const { return true; }
virtual bool is_active_Java_thread() const {
return on_thread_list() && !is_terminated();
}
// Thread oop. threadObj() can be NULL for initial JavaThread
// (or for threads attached via JNI)
oop threadObj() const;
void set_threadOopHandles(oop p);
oop vthread() const;
void set_vthread(oop p);
oop scopedValueCache() const;
void set_scopedValueCache(oop p);
void clear_scopedValueBindings();
oop jvmti_vthread() const;
void set_jvmti_vthread(oop p);
// 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, const 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
inline JavaThreadState thread_state() const;
inline void set_thread_state(JavaThreadState s);
inline void set_thread_state_fence(JavaThreadState s); // fence after setting thread state
inline ThreadSafepointState* safepoint_state() const;
inline void set_safepoint_state(ThreadSafepointState* state);
inline bool is_at_poll_safepoint();
// JavaThread termination and lifecycle support:
void smr_delete();
bool on_thread_list() const { return _on_thread_list; }
void set_on_thread_list() { _on_thread_list = true; }
// thread has called JavaThread::exit(), thread's GC barrier is detached
// or thread is terminated
bool is_exiting() const;
// thread's GC barrier is NOT detached and thread is NOT terminated
bool is_oop_safe() const;
// thread is terminated (no longer on the threads list); the thread must
// be protected by a ThreadsListHandle to avoid potential crashes.
bool check_is_terminated(TerminatedTypes l_terminated) const {
return l_terminated == _thread_terminated || l_terminated == _vm_exited;
}
bool is_terminated() const;
void set_terminated(TerminatedTypes t);
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; }
SafepointMechanism::ThreadData* poll_data() { return &_poll_data; }
void set_requires_cross_modify_fence(bool val) PRODUCT_RETURN NOT_PRODUCT({ _requires_cross_modify_fence = val; })
// Continuation support
ContinuationEntry* last_continuation() const { return _cont_entry; }
void set_cont_fastpath(intptr_t* x) { _cont_fastpath = x; }
void push_cont_fastpath(intptr_t* sp) { if (sp > _cont_fastpath) _cont_fastpath = sp; }
void set_cont_fastpath_thread_state(bool x) { _cont_fastpath_thread_state = (int)x; }
intptr_t* raw_cont_fastpath() const { return _cont_fastpath; }
bool cont_fastpath() const { return _cont_fastpath == NULL && _cont_fastpath_thread_state != 0; }
bool cont_fastpath_thread_state() const { return _cont_fastpath_thread_state != 0; }
void inc_held_monitor_count(int i = 1, bool jni = false);
void dec_held_monitor_count(int i = 1, bool jni = false);
int64_t held_monitor_count() { return (int64_t)_held_monitor_count; }
int64_t jni_monitor_count() { return (int64_t)_jni_monitor_count; }
void clear_jni_monitor_count() { _jni_monitor_count = 0; }
inline bool is_vthread_mounted() const;
inline const ContinuationEntry* vthread_continuation() const;
private:
DEBUG_ONLY(void verify_frame_info();)
// Support for thread handshake operations
HandshakeState _handshake;
public:
HandshakeState* handshake_state() { return &_handshake; }
// A JavaThread can always safely operate on it self and other threads
// can do it safely if they are the active handshaker.
bool is_handshake_safe_for(Thread* th) const {
return _handshake.active_handshaker() == th || this == th;
}
// Suspend/resume support for JavaThread
// higher-level suspension/resume logic called by the public APIs
bool java_suspend();
bool java_resume();
bool is_suspended() { return _handshake.is_suspended(); }
// Check for async exception in addition to safepoint.
static void check_special_condition_for_native_trans(JavaThread *thread);
// Synchronize with another thread that is deoptimizing objects of the
// current thread, i.e. reverts optimizations based on escape analysis.
void wait_for_object_deoptimization();
#if INCLUDE_JVMTI
inline void set_carrier_thread_suspended();
inline void clear_carrier_thread_suspended();
bool is_carrier_thread_suspended() const {
return _carrier_thread_suspended;
}
bool is_in_VTMS_transition() const { return _is_in_VTMS_transition; }
bool is_in_tmp_VTMS_transition() const { return _is_in_tmp_VTMS_transition; }
bool is_in_any_VTMS_transition() const { return _is_in_VTMS_transition || _is_in_tmp_VTMS_transition; }
void set_is_in_VTMS_transition(bool val);
void toggle_is_in_tmp_VTMS_transition() { _is_in_tmp_VTMS_transition = !_is_in_tmp_VTMS_transition; };
#ifdef ASSERT
bool is_VTMS_transition_disabler() const { return _is_VTMS_transition_disabler; }
void set_is_VTMS_transition_disabler(bool val);
#endif
#endif
// Support for object deoptimization and JFR suspension
void handle_special_runtime_exit_condition();
bool has_special_runtime_exit_condition() {
return (_suspend_flags & (_obj_deopt JFR_ONLY(| _trace_flag))) != 0;
}
// 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 deferring update of java frame locals until deopt occurs
JvmtiDeferredUpdates* deferred_updates() const { return _jvmti_deferred_updates; }
void set_deferred_updates(JvmtiDeferredUpdates* du) { _jvmti_deferred_updates = du; }
// 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; }
void set_deopt_compiled_method(CompiledMethod* nm) { _deopt_nmethod = nm; }
CompiledMethod* deopt_compiled_method() { return _deopt_nmethod; }
Method* callee_target() const { return _callee_target; }
void set_callee_target (Method* 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; }
void set_vm_result_2 (Metadata* 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; }
#if INCLUDE_JVMCI
jlong pending_failed_speculation() const { return _pending_failed_speculation; }
void set_pending_monitorenter(bool b) { _pending_monitorenter = b; }
void set_pending_deoptimization(int reason) { _pending_deoptimization = reason; }
void set_pending_failed_speculation(jlong failed_speculation) { _pending_failed_speculation = failed_speculation; }
void set_pending_transfer_to_interpreter(bool b) { _pending_transfer_to_interpreter = b; }
void set_jvmci_alternate_call_target(address a) { assert(_jvmci._alternate_call_target == NULL, "must be"); _jvmci._alternate_call_target = a; }
void set_jvmci_implicit_exception_pc(address a) { assert(_jvmci._implicit_exception_pc == NULL, "must be"); _jvmci._implicit_exception_pc = a; }
virtual bool in_retryable_allocation() const { return _in_retryable_allocation; }
void set_in_retryable_allocation(bool b) { _in_retryable_allocation = b; }
JVMCIRuntime* libjvmci_runtime() const { return _libjvmci_runtime; }
void set_libjvmci_runtime(JVMCIRuntime* rt) {
assert((_libjvmci_runtime == nullptr && rt != nullptr) || (_libjvmci_runtime != nullptr && rt == nullptr), "must be");
_libjvmci_runtime = rt;
}
#endif // INCLUDE_JVMCI
// Exception handling for compiled methods
oop exception_oop() const;
address exception_pc() const { return _exception_pc; }
void set_exception_oop(oop o);
void set_exception_pc(address a) { _exception_pc = a; }
void set_exception_handler_pc(address a) { _exception_handler_pc = a; }
void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; }
void clear_exception_oop_and_pc() {
set_exception_oop(NULL);
set_exception_pc(NULL);
}
// Check if address is in the usable part of the stack (excludes protected
// guard pages). Can be applied to any thread and is an approximation for
// using is_in_live_stack when the query has to happen from another thread.
bool is_in_usable_stack(address adr) const {
return is_in_stack_range_incl(adr, _stack_overflow_state.stack_reserved_zone_base());
}
// 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; }
static ByteSize scopedValueCache_offset() { return byte_offset_of(JavaThread, _scopedValueCache); }
// For assembly stub generation
static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj); }
static ByteSize vthread_offset() { return byte_offset_of(JavaThread, _vthread); }
static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment); }
static ByteSize pending_jni_exception_check_fn_offset() {
return byte_offset_of(JavaThread, _pending_jni_exception_check_fn);
}
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 polling_word_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_word);}
static ByteSize polling_page_offset() { return byte_offset_of(JavaThread, _poll_data) + byte_offset_of(SafepointMechanism::ThreadData, _polling_page);}
static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc); }
static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread); }
#if INCLUDE_JVMCI
static ByteSize pending_deoptimization_offset() { return byte_offset_of(JavaThread, _pending_deoptimization); }
static ByteSize pending_monitorenter_offset() { return byte_offset_of(JavaThread, _pending_monitorenter); }
static ByteSize jvmci_alternate_call_target_offset() { return byte_offset_of(JavaThread, _jvmci._alternate_call_target); }
static ByteSize jvmci_implicit_exception_pc_offset() { return byte_offset_of(JavaThread, _jvmci._implicit_exception_pc); }
static ByteSize jvmci_counters_offset() { return byte_offset_of(JavaThread, _jvmci_counters); }
#endif // INCLUDE_JVMCI
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 is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); }
static ByteSize active_handles_offset() { return byte_offset_of(JavaThread, _active_handles); }
// StackOverflow offsets
static ByteSize stack_overflow_limit_offset() {
return byte_offset_of(JavaThread, _stack_overflow_state._stack_overflow_limit);
}
static ByteSize stack_guard_state_offset() {
return byte_offset_of(JavaThread, _stack_overflow_state._stack_guard_state);
}
static ByteSize reserved_stack_activation_offset() {
return byte_offset_of(JavaThread, _stack_overflow_state._reserved_stack_activation);
}
static ByteSize shadow_zone_safe_limit() {
return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_safe_limit);
}
static ByteSize shadow_zone_growth_watermark() {
return byte_offset_of(JavaThread, _stack_overflow_state._shadow_zone_growth_watermark);
}
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);
}
static ByteSize doing_unsafe_access_offset() { return byte_offset_of(JavaThread, _doing_unsafe_access); }
NOT_PRODUCT(static ByteSize requires_cross_modify_fence_offset() { return byte_offset_of(JavaThread, _requires_cross_modify_fence); })
static ByteSize cont_entry_offset() { return byte_offset_of(JavaThread, _cont_entry); }
static ByteSize cont_fastpath_offset() { return byte_offset_of(JavaThread, _cont_fastpath); }
static ByteSize held_monitor_count_offset() { return byte_offset_of(JavaThread, _held_monitor_count); }
// Returns the jni environment for this thread
JNIEnv* jni_environment() { return &_jni_environment; }
// Returns the current thread as indicated by the given JNIEnv.
// We don't assert it is Thread::current here as that is done at the
// external JNI entry points where the JNIEnv is passed into the VM.
static JavaThread* thread_from_jni_environment(JNIEnv* env) {
JavaThread* current = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset()));
// We can't normally get here in a thread that has completed its
// execution and so "is_terminated", except when the call is from
// AsyncGetCallTrace, which can be triggered by a signal at any point in
// a thread's lifecycle. A thread is also considered terminated if the VM
// has exited, so we have to check this and block in case this is a daemon
// thread returning to the VM (the JNI DirectBuffer entry points rely on
// this).
if (current->is_terminated()) {
current->block_if_vm_exited();
}
return current;
}
// JNI critical regions. These can nest.
bool in_critical() { return _jni_active_critical > 0; }
bool in_last_critical() { return _jni_active_critical == 1; }
inline void enter_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?");
}
// Checked JNI: is the programmer required to check for exceptions, if so specify
// which function name. Returning to a Java frame should implicitly clear the
// pending check, this is done for Native->Java transitions (i.e. user JNI code).
// VM->Java transitions are not cleared, it is expected that JNI code enclosed
// within ThreadToNativeFromVM makes proper exception checks (i.e. VM internal).
bool is_pending_jni_exception_check() const { return _pending_jni_exception_check_fn != NULL; }
void clear_pending_jni_exception_check() { _pending_jni_exception_check_fn = NULL; }
const char* get_pending_jni_exception_check() const { return _pending_jni_exception_check_fn; }
void set_pending_jni_exception_check(const char* fn_name) { _pending_jni_exception_check_fn = (char*) fn_name; }
// 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; }
// 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:
// 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_frames(OopClosure* f, CodeBlobClosure* cf);
void oops_do_no_frames(OopClosure* f, CodeBlobClosure* cf);
// GC operations
virtual void nmethods_do(CodeBlobClosure* cf);
// RedefineClasses Support
void metadata_do(MetadataClosure* f);
// Debug method asserting thread states are correct during a handshake operation.
DEBUG_ONLY(void verify_states_for_handshake();)
// Misc. operations
const char* name() const;
const char* type_name() const { return "JavaThread"; }
static const char* name_for(oop thread_obj);
void print_on(outputStream* st, bool print_extended_info) const;
void print_on(outputStream* st) const { print_on(st, false); }
void print() const;
void print_thread_state_on(outputStream*) const;
void print_on_error(outputStream* st, char* buf, int buflen) const;
void print_name_on_error(outputStream* st, char* buf, int buflen) const;
void verify();
// Accessing frames
frame last_frame() {
_anchor.make_walkable();
return pd_last_frame();
}
javaVFrame* last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(last_frame(), reg_map); }
frame carrier_last_frame(RegisterMap* reg_map);
javaVFrame* carrier_last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(carrier_last_frame(reg_map), reg_map); }
frame vthread_last_frame();
javaVFrame* vthread_last_java_vframe(RegisterMap* reg_map) { return last_java_vframe(vthread_last_frame(), reg_map); }
frame platform_thread_last_frame(RegisterMap* reg_map);
javaVFrame* platform_thread_last_java_vframe(RegisterMap* reg_map) {
return last_java_vframe(platform_thread_last_frame(reg_map), reg_map);
}
javaVFrame* last_java_vframe(const frame f, RegisterMap* reg_map);
// Returns method at 'depth' java or native frames down the stack
// Used for security checks
Klass* 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;
// Print an annotated view of the stack frames
void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN;
void validate_frame_layout() {
print_frame_layout(0, true);
}
// Function for testing deoptimization
void deoptimize();
void make_zombies();
void deoptimize_marked_methods();
public:
// Returns the running thread as a JavaThread
static JavaThread* current() {
return JavaThread::cast(Thread::current());
}
// Returns the current thread as a JavaThread, or NULL if not attached
static inline JavaThread* current_or_null();
// Casts
static JavaThread* cast(Thread* t) {
assert(t->is_Java_thread(), "incorrect cast to JavaThread");
return static_cast<JavaThread*>(t);
}
static const JavaThread* cast(const Thread* t) {
assert(t->is_Java_thread(), "incorrect cast to const JavaThread");
return static_cast<const JavaThread*>(t);
}
// 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();
protected:
virtual void pre_run();
virtual void run();
void thread_main_inner();
virtual void post_run();
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); }
#if INCLUDE_JVMTI
// Rebind JVMTI thread state from carrier to virtual or from virtual to carrier.
JvmtiThreadState *rebind_to_jvmti_thread_state_of(oop thread_oop);
#endif
// 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; }
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; }
int frames_to_pop_failed_realloc() const { return _frames_to_pop_failed_realloc; }
void set_frames_to_pop_failed_realloc(int nb) { _frames_to_pop_failed_realloc = nb; }
void dec_frames_to_pop_failed_realloc() { _frames_to_pop_failed_realloc--; }
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;
// 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 at a safepoint or using a direct handshake
// (see EnterInterpOnlyModeClosure).
// It can be set to zero asynchronously to this threads execution (i.e., without
// safepoint/handshake or a lock) so we have to be very careful.
// Accesses by other threads are synchronized using JvmtiThreadState_lock though.
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; }
int set_interp_only_mode(int val) { return _interp_only_mode = val; }
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:
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;
}
// Machine dependent stuff
#include OS_CPU_HEADER(javaThread)
// JSR166 per-thread parker
private:
Parker _parker;
public:
Parker* parker() { return &_parker; }
public:
// clearing/querying jni attach status
bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; }
bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; }
inline void set_done_attaching_via_jni();
// Stack dump assistance:
// Track the class we want to initialize but for which we have to wait
// on its init_lock() because it is already being initialized.
void set_class_to_be_initialized(InstanceKlass* k);
InstanceKlass* class_to_be_initialized() const;
private:
InstanceKlass* _class_to_be_initialized;
// java.lang.Thread.sleep support
ParkEvent * _SleepEvent;
public:
bool sleep(jlong millis);
// java.lang.Thread interruption support
void interrupt();
bool is_interrupted(bool clear_interrupted);
static OopStorage* thread_oop_storage();
static void verify_cross_modify_fence_failure(JavaThread *thread) PRODUCT_RETURN;
// Helper function to create the java.lang.Thread object for a
// VM-internal thread. The thread will have the given name, be
// part of the System ThreadGroup and if is_visible is true will be
// discoverable via the system ThreadGroup.
static Handle create_system_thread_object(const char* name, bool is_visible, TRAPS);
// Helper function to start a VM-internal daemon thread.
// E.g. ServiceThread, NotificationThread, CompilerThread etc.
static void start_internal_daemon(JavaThread* current, JavaThread* target,
Handle thread_oop, ThreadPriority prio);
// Helper function to do vm_exit_on_initialization for osthread
// resource allocation failure.
static void vm_exit_on_osthread_failure(JavaThread* thread);
// Deferred OopHandle release support
private:
// List of OopHandles to be released - guarded by the Service_lock.
static OopHandleList* _oop_handle_list;
// Add our OopHandles to the list for the service thread to release.
void add_oop_handles_for_release();
// Called by the ServiceThread to release the OopHandles.
static void release_oop_handles();
// Called by the ServiceThread to poll if there are any OopHandles to release.
// Called when holding the Service_lock.
static bool has_oop_handles_to_release() {
return _oop_handle_list != nullptr;
}
};
inline JavaThread* JavaThread::current_or_null() {
Thread* current = Thread::current_or_null();
return current != nullptr ? JavaThread::cast(current) : nullptr;
}
class UnlockFlagSaver {
private:
JavaThread* _thread;
bool _do_not_unlock;
public:
UnlockFlagSaver(JavaThread* t) {
_thread = t;
_do_not_unlock = t->do_not_unlock_if_synchronized();
t->set_do_not_unlock_if_synchronized(false);
}
~UnlockFlagSaver() {
_thread->set_do_not_unlock_if_synchronized(_do_not_unlock);
}
};
class JNIHandleMark : public StackObj {
JavaThread* _thread;
public:
JNIHandleMark(JavaThread* thread) : _thread(thread) {
thread->push_jni_handle_block();
}
~JNIHandleMark() { _thread->pop_jni_handle_block(); }
};
#endif // SHARE_RUNTIME_JAVATHREAD_HPP
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