public static CilType CastMaybeGeneric(CilType castType, bool valueOnly, JavaCode code)
{
if (!castType.IsGenericParameter)
{
return(castType);
}
if (!valueOnly)
{
GenericUtil.ValueLoad(code);
}
var genericMark = CilMain.GenericStack.Mark();
var(resolvedType, resolvedIndex) = CilMain.GenericStack.Resolve(castType.JavaName);
if (resolvedIndex == 0)
{
if (valueOnly)
{
// this flag is set when called from LoadFieldAddress. we can cast
// the generic field to the actual type only if it is a value type
if (resolvedType.IsValueClass)
{
castType = resolvedType;
code.NewInstruction(0xC0 /* checkcast */, castType.AsWritableClass, null);
}
else if (castType.IsByReference)
{
var boxedType = new BoxedType(resolvedType, false);
code.NewInstruction(0xC0 /* checkcast */, boxedType, null);
castType = boxedType;
}
}
else
{
// this flag is clear whe called from LoadFieldValue and
// PushMethodReturnType. we can cast to any known actual types.
var arrayRank = castType.GetMethodGenericParameter()?.ArrayRank ?? 0;
castType = (arrayRank == 0) ? resolvedType : resolvedType.AdjustRank(arrayRank);
if (!castType.IsReference)
{
var boxedType = new BoxedType(castType, false);
code.NewInstruction(0xC0 /* checkcast */, boxedType, null);
boxedType.GetValue(code);
}
else
{
code.NewInstruction(0xC0 /* checkcast */, castType.AsWritableClass, null);
}
}
}
CilMain.GenericStack.Release(genericMark);
return(castType);
}