public static MethodHandle makeSpreadArguments(MethodType newType, MethodHandle target, java.lang.Class spreadArgType, int spreadArgPos, int spreadArgCount)
{
#if FIRST_PASS
return(null);
#else
TypeWrapper twComponent = TypeWrapper.FromClass(spreadArgType).ElementTypeWrapper;
MethodHandleUtil.DynamicMethodBuilder dm = new MethodHandleUtil.DynamicMethodBuilder("AdapterMethodHandle.spreadArguments", newType, target);
for (int i = 0, count = newType.parameterCount(); i < count; i++)
{
if (i == spreadArgPos)
{
for (int j = 0; j < spreadArgCount; j++)
{
dm.Ldarg(i);
dm.LoadArrayElement(j, twComponent);
dm.Convert(twComponent.ClassObject, target.type().parameterType(i + j), 0);
}
}
else
{
dm.Ldarg(i);
}
}
dm.CallTarget();
dm.Ret();
return(dm.CreateAdapter());
#endif
}
public static MethodHandle permuteArguments(MethodHandle target, MethodType newType, MethodType oldType, int[] permutationOrNull)
{
#if FIRST_PASS
return(null);
#else
// LAME why does OpenJDK name the parameter permutationOrNull while it is not allowed to be null?
if (permutationOrNull.Length != oldType.parameterCount())
{
throw new java.lang.IllegalArgumentException("wrong number of arguments in permutation");
}
MethodHandleUtil.DynamicMethodBuilder dm = new MethodHandleUtil.DynamicMethodBuilder("MethodHandleImpl.permuteArguments", newType, target);
for (int i = 0, argCount = newType.parameterCount(); i < permutationOrNull.Length; i++)
{
// make sure to only read each array element once, to avoid having to make a defensive copy of the array
int perm = permutationOrNull[i];
if (perm < 0 || perm >= argCount)
{
throw new java.lang.IllegalArgumentException("permutation argument out of range");
}
dm.Ldarg(perm);
dm.Convert(oldType.parameterType(i), newType.parameterType(perm), 0);
}
dm.CallTarget();
dm.Convert(oldType.returnType(), newType.returnType(), 0);
dm.Ret();
return(dm.CreateAdapter());
#endif
}
public static MethodHandle makePairwiseConvert(MethodType newType, MethodHandle target, int level)
{
#if FIRST_PASS
return(null);
#else
MethodType oldType = target.type();
MethodHandleUtil.DynamicMethodBuilder dm = new MethodHandleUtil.DynamicMethodBuilder("AdapterMethodHandle.pairwiseConvert", newType, target);
for (int i = 0, count = newType.parameterCount(); i < count; i++)
{
dm.Ldarg(i);
dm.Convert(newType.parameterType(i), oldType.parameterType(i), level);
}
dm.CallTarget();
dm.Convert(oldType.returnType(), newType.returnType(), level);
dm.Ret();
return(dm.CreateAdapter());
#endif
}
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
}
