public static MethodHandle makeCollectArguments(MethodHandle target, MethodHandle collector, int collectArgPos, bool retainOriginalArgs)
{
#if FIRST_PASS
return(null);
#else
MethodType targetType = target.type();
MethodType collectorType = collector.type();
bool isfilter = collectorType.returnType() == java.lang.Void.TYPE;
MethodType newType = targetType.dropParameterTypes(collectArgPos, collectArgPos + (isfilter ? 0 : 1));
if (!retainOriginalArgs)
{
newType = newType.insertParameterTypes(collectArgPos, collectorType.parameterList());
}
MethodHandleUtil.DynamicMethodBuilder dm = new MethodHandleUtil.DynamicMethodBuilder("AdapterMethodHandle.collectArguments", newType, target, collector.vmtarget);
for (int i = 0, count = newType.parameterCount(); i < count || i == collectArgPos; i++)
{
if (i == collectArgPos)
{
dm.LoadValue();
for (int j = 0; j < collectorType.parameterCount(); j++)
{
dm.Ldarg(i + j);
}
dm.CallValue();
collectArgPos = -1;
i--;
if (!retainOriginalArgs)
{
i += collectorType.parameterCount();
}
}
else
{
dm.Ldarg(i);
}
}
dm.CallTarget();
dm.Ret();
return(dm.CreateAdapter());
#endif
}
public static object createDelegate(MethodType newType, MethodHandle mh, int argnum, object argument)
{
#if FIRST_PASS
return(null);
#else
Delegate del = (Delegate)mh.vmtarget;
if (argnum == 0 &&
del.Target == null
// we don't have to check for instance methods on a Value Type, because DirectMethodHandle can't use a direct delegate for that anyway
&& (!del.Method.IsStatic || !del.Method.GetParameters()[0].ParameterType.IsValueType) &&
!ReflectUtil.IsDynamicMethod(del.Method))
{
return(Delegate.CreateDelegate(MethodHandleUtil.CreateDelegateType(newType), argument, del.Method));
}
else
{
// slow path where we're generating a DynamicMethod
if (mh.type().parameterType(argnum).isPrimitive())
{
argument = JVM.Unbox(argument);
}
MethodHandleUtil.DynamicMethodBuilder dm = new MethodHandleUtil.DynamicMethodBuilder("BoundMethodHandle", newType, mh, argument);
for (int i = 0, count = mh.type().parameterCount(), pos = 0; i < count; i++)
{
if (i == argnum)
{
dm.LoadValue();
}
else
{
dm.Ldarg(pos++);
}
}
dm.CallTarget();
dm.Ret();
return(dm.CreateDelegate());
}
#endif
}
