src/hotspot/cpu/s390/interp_masm_s390.cpp

rev 47400 : [mq]: cmpxchg_ptr

*** 912,922 ****
  
    // template code:
    //
    // markOop displaced_header = obj->mark().set_unlocked();
    // monitor->lock()->set_displaced_header(displaced_header);
!   // if (Atomic::cmpxchg_ptr(/*ex=*/monitor, /*addr*/obj->mark_addr(), /*cmp*/displaced_header) == displaced_header) {
    //   // We stored the monitor address into the object's mark word.
    // } else if (THREAD->is_lock_owned((address)displaced_header))
    //   // Simple recursive case.
    //   monitor->lock()->set_displaced_header(NULL);
    // } else {
--- 912,922 ----
  
    // template code:
    //
    // markOop displaced_header = obj->mark().set_unlocked();
    // monitor->lock()->set_displaced_header(displaced_header);
!   // if (Atomic::cmpxchg(/*ex=*/monitor, /*addr*/obj->mark_addr(), /*cmp*/displaced_header) == displaced_header) {
    //   // We stored the monitor address into the object's mark word.
    // } else if (THREAD->is_lock_owned((address)displaced_header))
    //   // Simple recursive case.
    //   monitor->lock()->set_displaced_header(NULL);
    // } else {
*** 947,957 ****
  
    // Initialize the box (Must happen before we update the object mark!).
    z_stg(displaced_header, BasicObjectLock::lock_offset_in_bytes() +
                            BasicLock::displaced_header_offset_in_bytes(), monitor);
  
!   // if (Atomic::cmpxchg_ptr(/*ex=*/monitor, /*addr*/obj->mark_addr(), /*cmp*/displaced_header) == displaced_header) {
  
    // Store stack address of the BasicObjectLock (this is monitor) into object.
    add2reg(object_mark_addr, oopDesc::mark_offset_in_bytes(), object);
  
    z_csg(displaced_header, monitor, 0, object_mark_addr);
--- 947,957 ----
  
    // Initialize the box (Must happen before we update the object mark!).
    z_stg(displaced_header, BasicObjectLock::lock_offset_in_bytes() +
                            BasicLock::displaced_header_offset_in_bytes(), monitor);
  
!   // if (Atomic::cmpxchg(/*ex=*/monitor, /*addr*/obj->mark_addr(), /*cmp*/displaced_header) == displaced_header) {
  
    // Store stack address of the BasicObjectLock (this is monitor) into object.
    add2reg(object_mark_addr, oopDesc::mark_offset_in_bytes(), object);
  
    z_csg(displaced_header, monitor, 0, object_mark_addr);
*** 1019,1029 ****
    // template code:
    //
    // if ((displaced_header = monitor->displaced_header()) == NULL) {
    //   // Recursive unlock. Mark the monitor unlocked by setting the object field to NULL.
    //   monitor->set_obj(NULL);
!   // } else if (Atomic::cmpxchg_ptr(displaced_header, obj->mark_addr(), monitor) == monitor) {
    //   // We swapped the unlocked mark in displaced_header into the object's mark word.
    //   monitor->set_obj(NULL);
    // } else {
    //   // Slow path.
    //   InterpreterRuntime::monitorexit(THREAD, monitor);
--- 1019,1029 ----
    // template code:
    //
    // if ((displaced_header = monitor->displaced_header()) == NULL) {
    //   // Recursive unlock. Mark the monitor unlocked by setting the object field to NULL.
    //   monitor->set_obj(NULL);
!   // } else if (Atomic::cmpxchg(displaced_header, obj->mark_addr(), monitor) == monitor) {
    //   // We swapped the unlocked mark in displaced_header into the object's mark word.
    //   monitor->set_obj(NULL);
    // } else {
    //   // Slow path.
    //   InterpreterRuntime::monitorexit(THREAD, monitor);
*** 1060,1070 ****
    MacroAssembler::load_and_test_long(displaced_header,
                                       Address(monitor, BasicObjectLock::lock_offset_in_bytes() +
                                                        BasicLock::displaced_header_offset_in_bytes()));
    z_bre(done); // displaced_header == 0 -> goto done
  
!   // } else if (Atomic::cmpxchg_ptr(displaced_header, obj->mark_addr(), monitor) == monitor) {
    //   // We swapped the unlocked mark in displaced_header into the object's mark word.
    //   monitor->set_obj(NULL);
  
    // If we still have a lightweight lock, unlock the object and be done.
  
--- 1060,1070 ----
    MacroAssembler::load_and_test_long(displaced_header,
                                       Address(monitor, BasicObjectLock::lock_offset_in_bytes() +
                                                        BasicLock::displaced_header_offset_in_bytes()));
    z_bre(done); // displaced_header == 0 -> goto done
  
!   // } else if (Atomic::cmpxchg(displaced_header, obj->mark_addr(), monitor) == monitor) {
    //   // We swapped the unlocked mark in displaced_header into the object's mark word.
    //   monitor->set_obj(NULL);
  
    // If we still have a lightweight lock, unlock the object and be done.