#ifndef SHARE_VM_RUNTIME_THREAD_HPP

#define SHARE_VM_RUNTIME_THREAD_HPP

#include "memory/allocation.hpp"

#include "memory/threadLocalAllocBuffer.hpp"

#include "oops/oop.hpp"

#include "prims/jni.h"

#include "prims/jvmtiExport.hpp"

#include "runtime/frame.hpp"

#include "runtime/javaFrameAnchor.hpp"

#include "runtime/jniHandles.hpp"

#include "runtime/mutexLocker.hpp"

#include "runtime/os.hpp"

#include "runtime/osThread.hpp"

#include "runtime/park.hpp"

#include "runtime/safepoint.hpp"

#include "runtime/stubRoutines.hpp"

#include "runtime/threadLocalStorage.hpp"

#include "runtime/unhandledOops.hpp"

#include "services/memRecorder.hpp"

#include "trace/traceBackend.hpp"

#include "trace/traceMacros.hpp"

#include "utilities/exceptions.hpp"

#include "utilities/top.hpp"

#ifndef SERIALGC

#include "gc_implementation/g1/dirtyCardQueue.hpp"

#include "gc_implementation/g1/satbQueue.hpp"

#endif

#ifdef ZERO

#ifdef TARGET_ARCH_zero

# include "stack_zero.hpp"

#endif

#endif

class ThreadSafepointState;

class ThreadProfiler;

class JvmtiThreadState;

class JvmtiGetLoadedClassesClosure;

class ThreadStatistics;

class ConcurrentLocksDump;

class ParkEvent;

class Parker;

class ciEnv;

class CompileThread;

class CompileLog;

class CompileTask;

class CompileQueue;

class CompilerCounters;

class vframeArray;

class DeoptResourceMark;

class jvmtiDeferredLocalVariableSet;

class GCTaskQueue;

class ThreadClosure;

class IdealGraphPrinter;

class WorkerThread;

class Thread: public ThreadShadow {

friend class VMStructs;

private:

// Exception handling

// (Note: _pending_exception and friends are in ThreadShadow)

//oop _pending_exception; // pending exception for current thread

// const char* _exception_file; // file information for exception (debugging only)

// int _exception_line; // line information for exception (debugging only)

protected:

// Support for forcing alignment of thread objects for biased locking

void* _real_malloc_address;

public:

void* operator new(size_t size) { return allocate(size, true); }

void* operator new(size_t size, std::nothrow_t& nothrow_constant) { return allocate(size, false); }

void operator delete(void* p);

protected:

static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread);

private:

// ***************************************************************

// Suspend and resume support

// ***************************************************************

//

// VM suspend/resume no longer exists - it was once used for various

// things including safepoints but was deprecated and finally removed

// in Java 7. Because VM suspension was considered "internal" Java-level

// suspension was considered "external", and this legacy naming scheme

// remains.

//

// External suspend/resume requests come from JVM_SuspendThread,

// JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI

// ResumeThread. External

// suspend requests cause _external_suspend to be set and external

// resume requests cause _external_suspend to be cleared.

// External suspend requests do not nest on top of other external

// suspend requests. The higher level APIs reject suspend requests

// for already suspended threads.

//

// The external_suspend

// flag is checked by has_special_runtime_exit_condition() and java thread

// will self-suspend when handle_special_runtime_exit_condition() is

// called. Most uses of the _thread_blocked state in JavaThreads are

// considered the same as being externally suspended; if the blocking

// condition lifts, the JavaThread will self-suspend. Other places

// where VM checks for external_suspend include:

// + mutex granting (do not enter monitors when thread is suspended)

// + state transitions from _thread_in_native

//

// In general, java_suspend() does not wait for an external suspend

// request to complete. When it returns, the only guarantee is that

// the _external_suspend field is true.

//

// wait_for_ext_suspend_completion() is used to wait for an external

// suspend request to complete. External suspend requests are usually

// followed by some other interface call that requires the thread to

// be quiescent, e.g., GetCallTrace(). By moving the "wait time" into

// the interface that requires quiescence, we give the JavaThread a

// chance to self-suspend before we need it to be quiescent. This

// improves overall suspend/query performance.

//

// _suspend_flags controls the behavior of java_ suspend/resume.

// It must be set under the protection of SR_lock. Read from the flag is

// OK without SR_lock as long as the value is only used as a hint.

// (e.g., check _external_suspend first without lock and then recheck

// inside SR_lock and finish the suspension)

//

// _suspend_flags is also overloaded for other "special conditions" so

// that a single check indicates whether any special action is needed

// eg. for async exceptions.

// -------------------------------------------------------------------

// Notes:

// 1. The suspend/resume logic no longer uses ThreadState in OSThread

// but we still update its value to keep other part of the system (mainly

// JVMTI) happy. ThreadState is legacy code (see notes in

// osThread.hpp).

//

// 2. It would be more natural if set_external_suspend() is private and

// part of java_suspend(), but that probably would affect the suspend/query

// performance. Need more investigation on this.

//

// suspend/resume lock: used for self-suspend

Monitor* _SR_lock;

protected:

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

_external_suspend = 0x20000000U, // thread is asked to self suspend

_ext_suspended = 0x40000000U, // thread has self-suspended

_deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt

_has_async_exception = 0x00000001U, // there is a pending async exception

_critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock

};

// various suspension related flags - atomically updated

// overloaded for async exception checking in check_special_condition_for_native_trans.

volatile uint32_t _suspend_flags;

private:

int _num_nested_signal;

public:

void enter_signal_handler() { _num_nested_signal++; }

void leave_signal_handler() { _num_nested_signal--; }

bool is_inside_signal_handler() const { return _num_nested_signal > 0; }

private:

// Debug tracing

static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN;

// Active_handles points to a block of handles

JNIHandleBlock* _active_handles;

// One-element thread local free list

JNIHandleBlock* _free_handle_block;

// Point to the last handle mark

HandleMark* _last_handle_mark;

// The parity of the last strong_roots iteration in which this thread was

// claimed as a task.

jint _oops_do_parity;

public:

void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; }

HandleMark* last_handle_mark() const { return _last_handle_mark; }

private:

// debug support for checking if code does allow safepoints or not

// GC points 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 !allow_safepoint(), then an assertion failure will happen in any of the above cases

// If !allow_allocation(), then an assertion failure will happen during allocation

// (Hence, !allow_safepoint() => !allow_allocation()).

//

// The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters.

//

NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen

debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops.

// Used by SkipGCALot class.

NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot?

// Record when GC is locked out via the GC_locker mechanism

CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;)

friend class No_Alloc_Verifier;

friend class No_Safepoint_Verifier;

friend class Pause_No_Safepoint_Verifier;

friend class ThreadLocalStorage;

friend class GC_locker;

ThreadLocalAllocBuffer _tlab; // Thread-local eden

jlong _allocated_bytes; // Cumulative number of bytes allocated on

// the Java heap

TRACE_DATA _trace_data; // Thread-local data for tracing

int _vm_operation_started_count; // VM_Operation support

int _vm_operation_completed_count; // VM_Operation support

ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread

// is waiting to lock

bool _current_pending_monitor_is_from_java; // locking is from Java code

// ObjectMonitor on which this thread called Object.wait()

ObjectMonitor* _current_waiting_monitor;

// Private thread-local objectmonitor list - a simple cache organized as a SLL.

public:

ObjectMonitor* omFreeList;

int omFreeCount; // length of omFreeList

int omFreeProvision; // reload chunk size

ObjectMonitor* omInUseList; // SLL to track monitors in circulation

int omInUseCount; // length of omInUseList

#ifdef ASSERT

private:

bool _visited_for_critical_count;

public:

void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; }

bool was_visited_for_critical_count() const { return _visited_for_critical_count; }

#endif

public:

enum {

is_definitely_current_thread = true

};

// Constructor

Thread();

virtual ~Thread();

// initializtion

void initialize_thread_local_storage();

// thread entry point

virtual void run();

// Testers

virtual bool is_VM_thread() const { return false; }

virtual bool is_Java_thread() const { return false; }

virtual bool is_Compiler_thread() const { return false; }

virtual bool is_hidden_from_external_view() const { return false; }

virtual bool is_jvmti_agent_thread() const { return false; }

// True iff the thread can perform GC operations at a safepoint.

// Generally will be true only of VM thread and parallel GC WorkGang

// threads.

virtual bool is_GC_task_thread() const { return false; }

virtual bool is_Watcher_thread() const { return false; }

virtual bool is_ConcurrentGC_thread() const { return false; }

virtual bool is_Named_thread() const { return false; }

virtual bool is_Worker_thread() const { return false; }

// Casts

virtual WorkerThread* as_Worker_thread() const { return NULL; }

virtual char* name() const { return (char*)"Unknown thread"; }

// Returns the current thread

static inline Thread* current();

// Common thread operations

static void set_priority(Thread* thread, ThreadPriority priority);

static ThreadPriority get_priority(const Thread* const thread);

static void start(Thread* thread);

static void interrupt(Thread* thr);

static bool is_interrupted(Thread* thr, bool clear_interrupted);

void set_native_thread_name(const char *name) {

assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");

os::set_native_thread_name(name);

}

ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; }

Monitor* SR_lock() const { return _SR_lock; }

bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }

void set_suspend_flag(SuspendFlags f) {

assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");

uint32_t flags;

do {

flags = _suspend_flags;

}

while (Atomic::cmpxchg((jint)(flags | f),

(volatile jint*)&_suspend_flags,

(jint)flags) != (jint)flags);

}

void clear_suspend_flag(SuspendFlags f) {

assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch");

uint32_t flags;

do {

flags = _suspend_flags;

}

while (Atomic::cmpxchg((jint)(flags & ~f),

(volatile jint*)&_suspend_flags,

(jint)flags) != (jint)flags);

}

void set_has_async_exception() {

set_suspend_flag(_has_async_exception);

}

void clear_has_async_exception() {

clear_suspend_flag(_has_async_exception);

}

bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; }

void set_critical_native_unlock() {

set_suspend_flag(_critical_native_unlock);

}

void clear_critical_native_unlock() {

clear_suspend_flag(_critical_native_unlock);

}

// Support for Unhandled Oop detection

#ifdef CHECK_UNHANDLED_OOPS

private:

UnhandledOops* _unhandled_oops;

public:

UnhandledOops* unhandled_oops() { return _unhandled_oops; }

// Mark oop safe for gc. It may be stack allocated but won't move.

void allow_unhandled_oop(oop *op) {

if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op);

}

// Clear oops at safepoint so crashes point to unhandled oop violator

void clear_unhandled_oops() {

if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops();

}

bool is_gc_locked_out() { return _gc_locked_out_count > 0; }

#endif // CHECK_UNHANDLED_OOPS

#ifndef PRODUCT

bool skip_gcalot() { return _skip_gcalot; }

void set_skip_gcalot(bool v) { _skip_gcalot = v; }

#endif

public:

// Installs a pending exception to be inserted later

static void send_async_exception(oop thread_oop, oop java_throwable);

// Resource area

ResourceArea* resource_area() const { return _resource_area; }

void set_resource_area(ResourceArea* area) { _resource_area = area; }

OSThread* osthread() const { return _osthread; }

void set_osthread(OSThread* thread) { _osthread = thread; }

// 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; }

// Internal handle support

HandleArea* handle_area() const { return _handle_area; }

void set_handle_area(HandleArea* area) { _handle_area = area; }

// Thread-Local Allocation Buffer (TLAB) support

ThreadLocalAllocBuffer& tlab() { return _tlab; }

void initialize_tlab() {

if (UseTLAB) {

tlab().initialize();

}

}

jlong allocated_bytes() { return _allocated_bytes; }

void set_allocated_bytes(jlong value) { _allocated_bytes = value; }

void incr_allocated_bytes(jlong size) { _allocated_bytes += size; }

jlong cooked_allocated_bytes() {

jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes);

if (UseTLAB) {

size_t used_bytes = tlab().used_bytes();

if ((ssize_t)used_bytes > 0) {

// More-or-less valid tlab. The load_acquire above should ensure

// that the result of the add is <= the instantaneous value

return allocated_bytes + used_bytes;

}

}

return allocated_bytes;

}

TRACE_DATA* trace_data() { return &_trace_data; }

// VM operation support

int vm_operation_ticket() { return ++_vm_operation_started_count; }

int vm_operation_completed_count() { return _vm_operation_completed_count; }

void increment_vm_operation_completed_count() { _vm_operation_completed_count++; }

// For tracking the heavyweight monitor the thread is pending on.

ObjectMonitor* current_pending_monitor() {

return _current_pending_monitor;

}

void set_current_pending_monitor(ObjectMonitor* monitor) {

_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;

}

// For tracking the ObjectMonitor on which this thread called Object.wait()

ObjectMonitor* current_waiting_monitor() {

return _current_waiting_monitor;

}

void set_current_waiting_monitor(ObjectMonitor* monitor) {

_current_waiting_monitor = monitor;

}

// GC support

// Apply "f->do_oop" to all root oops in "this".

// Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames

virtual void oops_do(OopClosure* f, CodeBlobClosure* cf);

// Handles the parallel case for the method below.

private:

bool claim_oops_do_par_case(int collection_parity);

public:

// Requires that "collection_parity" is that of the current strong roots

// iteration. If "is_par" is false, sets the parity of "this" to

// "collection_parity", and returns "true". If "is_par" is true,

// uses an atomic instruction to set the current threads parity to

// "collection_parity", if it is not already. Returns "true" iff the

// calling thread does the update, this indicates that the calling thread

// has claimed the thread's stack as a root groop in the current

// collection.

bool claim_oops_do(bool is_par, int collection_parity) {

if (!is_par) {

_oops_do_parity = collection_parity;

return true;

} else {

return claim_oops_do_par_case(collection_parity);

}

}

// Sweeper support

void nmethods_do(CodeBlobClosure* cf);

// Used by fast lock support

virtual bool is_lock_owned(address adr) const;

// Check if address is in the stack of the thread (not just for locks).

// Warning: the method can only be used on the running thread

bool is_in_stack(address adr) const;

// Sets this thread as starting thread. Returns failure if thread

// creation fails due to lack of memory, too many threads etc.

bool set_as_starting_thread();

protected:

// OS data associated with the thread

OSThread* _osthread; // Platform-specific thread information

// Thread local resource area for temporary allocation within the VM

ResourceArea* _resource_area;

// Thread local handle area for allocation of handles within the VM

HandleArea* _handle_area;

// Support for stack overflow handling, get_thread, etc.

address _stack_base;

size_t _stack_size;

uintptr_t _self_raw_id; // used by get_thread (mutable)

int _lgrp_id;

public:

// Stack overflow support

address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; }

void set_stack_base(address base) { _stack_base = base; }

size_t stack_size() const { return _stack_size; }

void set_stack_size(size_t size) { _stack_size = size; }

void record_stack_base_and_size();

bool on_local_stack(address adr) const {

/* QQQ this has knowledge of direction, ought to be a stack method */

return (_stack_base >= adr && adr >= (_stack_base - _stack_size));

}

uintptr_t self_raw_id() { return _self_raw_id; }

void set_self_raw_id(uintptr_t value) { _self_raw_id = value; }

int lgrp_id() const { return _lgrp_id; }

void set_lgrp_id(int value) { _lgrp_id = value; }

// Printing

void print_on(outputStream* st) const;

void print() const { print_on(tty); }

virtual void print_on_error(outputStream* st, char* buf, int buflen) const;

// Debug-only code

#ifdef ASSERT

private:

// Deadlock detection support for Mutex locks. List of locks own by thread.

Monitor* _owned_locks;

// Mutex::set_owner_implementation is the only place where _owned_locks is modified,

// thus the friendship

friend class Mutex;

friend class Monitor;

public:

void print_owned_locks_on(outputStream* st) const;

void print_owned_locks() const { print_owned_locks_on(tty); }

Monitor* owned_locks() const { return _owned_locks; }

bool owns_locks() const { return owned_locks() != NULL; }

bool owns_locks_but_compiled_lock() const;

// Deadlock detection

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

static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); }

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 Thread* Thread::current() {

#ifdef ASSERT

#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;

}

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; }

};

class WorkerThread: public NamedThread {

private:

uint _id;

public:

WorkerThread() : _id(0) { }

virtual bool is_Worker_thread() const { return true; }

virtual WorkerThread* as_Worker_thread() const {

assert(is_Worker_thread(), "Dubious cast to WorkerThread*?");

return (WorkerThread*) this;

}

void set_id(uint work_id) { _id = work_id; }

uint id() const { return _id; }

};

class WatcherThread: public Thread {

friend class VMStructs;

public:

virtual void run();

private:

static WatcherThread* _watcher_thread;

static bool _startable;

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); }

void unpark();

// 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();

// Only allow start once the VM is sufficiently initialized

// Otherwise the first task to enroll will trigger the start

static void make_startable();

private:

int sleep() const;

};

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.

volatile 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.

// 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;

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 _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_via_jni = 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; }

// native memory tracking

inline MemRecorder* get_recorder() const { return (MemRecorder*)_recorder; }

inline void set_recorder(MemRecorder* rc) { _recorder = rc; }

private:

// per-thread memory recorder

MemRecorder* volatile _recorder;

// 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);

// Same as check_special_condition_for_native_trans but finishes the

// transition into thread_in_Java mode so that it can potentially

// block.

static void check_special_condition_for_native_trans_and_transition(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; }

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_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_guard_zone_unused();

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 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; }

bool in_last_critical() { return _jni_active_critical == 1; }

void enter_critical() { assert(Thread::current() == this ||

Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(),

"this must be current thread or synchronizing");

_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;

void trace_oops() 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);

}

// 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;

}

// NMT (Native memory tracking) support.

// This flag helps NMT to determine if this JavaThread will be blocked

// at safepoint. If not, ThreadCritical is needed for writing memory records.

// JavaThread is only safepoint visible when it is in Threads' thread list,

// it is not visible until it is added to the list and becomes invisible

// once it is removed from the list.

public:

bool is_safepoint_visible() const { return _safepoint_visible; }

void set_safepoint_visible(bool visible) { _safepoint_visible = visible; }

private:

bool _safepoint_visible;

// 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

#ifdef TARGET_OS_ARCH_linux_x86

# include "thread_linux_x86.hpp"

#endif

#ifdef TARGET_OS_ARCH_linux_sparc

# include "thread_linux_sparc.hpp"

#endif

#ifdef TARGET_OS_ARCH_linux_zero

# include "thread_linux_zero.hpp"

#endif

#ifdef TARGET_OS_ARCH_solaris_x86

# include "thread_solaris_x86.hpp"

#endif

#ifdef TARGET_OS_ARCH_solaris_sparc

# include "thread_solaris_sparc.hpp"

#endif

#ifdef TARGET_OS_ARCH_windows_x86

# include "thread_windows_x86.hpp"

#endif

#ifdef TARGET_OS_ARCH_linux_arm

# include "thread_linux_arm.hpp"

#endif

#ifdef TARGET_OS_ARCH_linux_ppc

# include "thread_linux_ppc.hpp"

#endif

#ifdef TARGET_OS_ARCH_bsd_x86

# include "thread_bsd_x86.hpp"

#endif

#ifdef TARGET_OS_ARCH_bsd_zero

# include "thread_bsd_zero.hpp"

#endif

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_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; }

void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; 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 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_guard_zone_unused() {

return _stack_guard_state == stack_guard_unused;

}

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;

}

class CompilerThread : public JavaThread {

friend class VMStructs;

private:

CompilerCounters* _counters;

ciEnv* _env;

CompileLog* _log;

CompileTask* _task;

CompileQueue* _queue;

BufferBlob* _buffer_blob;

nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper

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;

}

// GC support

// Apply "f->do_oop" to all root oops in "this".

// Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames

void oops_do(OopClosure* f, CodeBlobClosure* cf);

#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; }

// Track the nmethod currently being scanned by the sweeper

void set_scanned_nmethod(nmethod* nm) {

assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value");

_scanned_nmethod = nm;

}

};

inline CompilerThread* CompilerThread::current() {

return JavaThread::current()->as_CompilerThread();

}

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();

};

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;

}

};

#endif // SHARE_VM_RUNTIME_THREAD_HPP