@Override
public long getMemorySize(JavaConstant constant) {
if (constant.getJavaKind() == JavaKind.Object) {
HotSpotResolvedObjectType lookupJavaType = lookupJavaType(constant);
if (lookupJavaType == null) {
return 0;
} else {
if (lookupJavaType.isArray()) {
// TODO(tw): Add compressed pointer support.
int length = Array.getLength(((HotSpotObjectConstantImpl) constant).object());
ResolvedJavaType elementType = lookupJavaType.getComponentType();
JavaKind elementKind = elementType.getJavaKind();
final int headerSize = getArrayBaseOffset(elementKind);
TargetDescription target = runtime.getHostJVMCIBackend().getTarget();
int sizeOfElement = getArrayIndexScale(elementKind);
int alignment = target.wordSize;
int log2ElementSize = CodeUtil.log2(sizeOfElement);
return computeArrayAllocationSize(length, alignment, headerSize, log2ElementSize);
}
return lookupJavaType.instanceSize();
}
} else {
return constant.getJavaKind().getByteCount();
}
}
@Override
public JavaConstant encodeDeoptActionAndReason(
DeoptimizationAction action, DeoptimizationReason reason, int debugId) {
HotSpotVMConfig config = runtime.getConfig();
int actionValue = convertDeoptAction(action);
int reasonValue = convertDeoptReason(reason);
int debugValue = debugId & intMaskRight(config.deoptimizationDebugIdBits);
JavaConstant c =
JavaConstant.forInt(
~((debugValue << config.deoptimizationDebugIdShift)
| (reasonValue << config.deoptimizationReasonShift)
| (actionValue << config.deoptimizationActionShift)));
assert c.asInt() < 0;
return c;
}
@Override
public Value emitUncompress(
Value pointer, HotSpotVMConfig.CompressEncoding encoding, boolean nonNull) {
LIRKind inputKind = pointer.getLIRKind();
assert inputKind.getPlatformKind() == AArch64Kind.DWORD;
if (inputKind.isReference(0)) {
// oop
Variable result = newVariable(LIRKind.reference(AArch64Kind.QWORD));
append(
new AArch64HotSpotMove.UncompressPointer(
result,
asAllocatable(pointer),
getProviders().getRegisters().getHeapBaseRegister().asValue(),
encoding,
nonNull));
return result;
} else {
// metaspace pointer
Variable result = newVariable(LIRKind.value(AArch64Kind.QWORD));
AllocatableValue base = Value.ILLEGAL;
if (encoding.base != 0) {
base =
emitLoadConstant(LIRKind.value(AArch64Kind.QWORD), JavaConstant.forLong(encoding.base));
}
append(
new AArch64HotSpotMove.UncompressPointer(
result, asAllocatable(pointer), base, encoding, nonNull));
return result;
}
}
public DeoptimizationAction decodeDeoptAction(JavaConstant constant) {
HotSpotVMConfig config = runtime.getConfig();
int actionValue =
((~constant.asInt()) >> config.deoptimizationActionShift)
& intMaskRight(config.deoptimizationActionBits);
DeoptimizationAction action = convertDeoptAction(actionValue);
return action;
}
public HotSpotResolvedObjectType lookupJavaType(JavaConstant constant) {
if (constant.isNull() || !(constant instanceof HotSpotObjectConstant)) {
return null;
}
return ((HotSpotObjectConstant) constant).getType();
}
public int decodeDebugId(JavaConstant constant) {
HotSpotVMConfig config = runtime.getConfig();
return ((~constant.asInt()) >> config.deoptimizationDebugIdShift)
& intMaskRight(config.deoptimizationDebugIdBits);
}