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8184181: Use oopDesc::cas_set_mark() instead of raw CAS when accessing oop header

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Reviewed-by: dcubed, kbarrett
This commit is contained in:
Roman Kennke 2017-07-17 08:43:28 +02:00
parent 63ac8937a1
commit 1772da638b
2 changed files with 10 additions and 10 deletions
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10
hotspot/src/share/vm/runtime/synchronizer.cpp
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@ -323,7 +323,7 @@ void ObjectSynchronizer::fast_exit(oop object, BasicLock* lock, TRAPS) {
// If the object is stack-locked by the current thread, try to
// swing the displaced header from the BasicLock back to the mark.
assert(dhw->is_neutral(), "invariant");
if ((markOop) Atomic::cmpxchg_ptr(dhw, object->mark_addr(), mark) == mark) {
if (object->cas_set_mark(dhw, mark) == mark) {
TEVENT(fast_exit: release stack-lock);
return;
}
@ -348,7 +348,7 @@ void ObjectSynchronizer::slow_enter(Handle obj, BasicLock* lock, TRAPS) {
// Anticipate successful CAS -- the ST of the displaced mark must
// be visible <= the ST performed by the CAS.
lock->set_displaced_header(mark);
if (mark == (markOop) Atomic::cmpxchg_ptr(lock, obj()->mark_addr(), mark)) {
if (mark == obj()->cas_set_mark((markOop) lock, mark)) {
TEVENT(slow_enter: release stacklock);
return;
}
@ -758,7 +758,7 @@ intptr_t ObjectSynchronizer::FastHashCode(Thread * Self, oop obj) {
hash = get_next_hash(Self, obj); // allocate a new hash code
temp = mark->copy_set_hash(hash); // merge the hash code into header
// use (machine word version) atomic operation to install the hash
test = (markOop) Atomic::cmpxchg_ptr(temp, obj->mark_addr(), mark);
test = obj->cas_set_mark(temp, mark);
if (test == mark) {
return hash;
}
@ -1452,7 +1452,7 @@ ObjectMonitor* ObjectSynchronizer::inflate(Thread * Self,
m->_recursions = 0;
m->_SpinDuration = ObjectMonitor::Knob_SpinLimit; // Consider: maintain by type/class
markOop cmp = (markOop) Atomic::cmpxchg_ptr(markOopDesc::INFLATING(), object->mark_addr(), mark);
markOop cmp = object->cas_set_mark(markOopDesc::INFLATING(), mark);
if (cmp != mark) {
omRelease(Self, m, true);
continue; // Interference -- just retry
@ -1547,7 +1547,7 @@ ObjectMonitor* ObjectSynchronizer::inflate(Thread * Self,
m->_Responsible = NULL;
m->_SpinDuration = ObjectMonitor::Knob_SpinLimit; // consider: keep metastats by type/class
if (Atomic::cmpxchg_ptr (markOopDesc::encode(m), object->mark_addr(), mark) != mark) {
if (object->cas_set_mark(markOopDesc::encode(m), mark) != mark) {
m->set_object(NULL);
m->set_owner(NULL);
m->Recycle();