/** Only returns addresses of valid OopHandles */
private Address getOopHandleAddress(int x) {
if (Assert.ASSERTS_ENABLED) {
Assert.that(x < top(), "out of bounds");
}
Address oopAddr = addr.addOffsetTo(handlesField.getOffset() + x * VM.getVM().getOopSize());
OopHandle handle = oopAddr.getOopHandleAt(0);
if (VM.getVM().getUniverse().isInReserved(handle)
&& !VM.getVM().getJNIHandles().isDeletedHandle(handle)) {
/* the oop handle is valid only if it is not freed (i.e. reserved in heap) and is not a deleted oop */
return oopAddr;
} else {
return null;
}
}
public String toString() {
Address handleBase = addr.addOffsetTo(handlesField.getOffset());
Address handleEnd =
addr.addOffsetTo(handlesField.getOffset() + top() * VM.getVM().getOopSize());
return "JNIHandleBlock [" + handleBase + ", " + handleEnd + ")";
}