public void EmitArithmeticOperation(ExpressionType nodeType, Type resultType, Type leftType, Type rightType, MethodInfo method)
{
if (!leftType.IsNullable() && !rightType.IsNullable())
{
if (method != null)
{
Il.Call(method);
}
else
{
if (leftType.IsStruct())
{
throw new InvalidOperationException("Unable to perfrom operation '" + nodeType + "' to a struct of type '" + leftType + "'");
}
if (rightType.IsStruct())
{
throw new InvalidOperationException("Unable to perfrom operation '" + nodeType + "' to a struct of type '" + rightType + "'");
}
EmitOp(Il, nodeType, resultType);
}
}
else
{
using (var localLeft = DeclareLocal(leftType))
using (var localRight = DeclareLocal(rightType))
{
Il.Stloc(localRight);
Il.Stloc(localLeft);
var returnNullLabel = Il.DefineLabel("returnNull");
if (leftType.IsNullable())
{
Il.Ldloca(localLeft);
EmitHasValueAccess(leftType);
Il.Brfalse(returnNullLabel);
}
if (rightType.IsNullable())
{
Il.Ldloca(localRight);
EmitHasValueAccess(rightType);
Il.Brfalse(returnNullLabel);
}
if (!leftType.IsNullable())
{
Il.Ldloc(localLeft);
}
else
{
Il.Ldloca(localLeft);
EmitValueAccess(leftType);
}
if (!rightType.IsNullable())
{
Il.Ldloc(localRight);
}
else
{
Il.Ldloca(localRight);
EmitValueAccess(rightType);
}
Type argumentType = resultType.GetGenericArguments()[0];
if (method != null)
{
Il.Call(method);
}
else
{
EmitOp(Il, nodeType, argumentType);
}
Il.Newobj(resultType.GetConstructor(new[] { argumentType }));
var doneLabel = Il.DefineLabel("done");
Il.Br(doneLabel);
MarkLabelAndSurroundWithSP(returnNullLabel);
EmitLoadDefaultValue(resultType);
MarkLabelAndSurroundWithSP(doneLabel);
}
}
}
public void EmitConvert(Type from, Type to, bool check = false)
{
if (from == to)
{
return;
}
if (!from.IsValueType)
{
if (!to.IsValueType)
{
Il.Castclass(to);
}
else
{
if (from != typeof(object) && !(from == typeof(Enum) && to.IsEnum))
{
throw new InvalidCastException("Cannot cast an object of type '" + from + "' to type '" + to + "'");
}
Il.Unbox_Any(to);
}
}
else
{
if (!to.IsValueType)
{
if (to != typeof(object) && !(to == typeof(Enum) && from.IsEnum))
{
throw new InvalidCastException("Cannot cast an object of type '" + from + "' to type '" + to + "'");
}
Il.Box(from);
}
else
{
if (to.IsNullable())
{
var toArgument = to.GetGenericArguments()[0];
if (from.IsNullable())
{
var fromArgument = from.GetGenericArguments()[0];
using (var temp = DeclareLocal(from))
{
Il.Stloc(temp);
Il.Ldloca(temp);
EmitHasValueAccess(from);
var valueIsNullLabel = Il.DefineLabel("valueIsNull");
Il.Brfalse(valueIsNullLabel);
Il.Ldloca(temp);
EmitValueAccess(from);
if (toArgument != fromArgument)
{
EmitConvert(fromArgument, toArgument, check);
}
Il.Newobj(to.GetConstructor(new[] { toArgument }));
var doneLabel = Il.DefineLabel("done");
Il.Br(doneLabel);
MarkLabelAndSurroundWithSP(valueIsNullLabel);
EmitLoadDefaultValue(to);
MarkLabelAndSurroundWithSP(doneLabel);
}
}
else
{
if (toArgument != from)
{
EmitConvert(from, toArgument, check);
}
Il.Newobj(to.GetConstructor(new[] { toArgument }));
}
}
else if (from.IsNullable())
{
var fromArgument = from.GetGenericArguments()[0];
using (var temp = DeclareLocal(from))
{
Il.Stloc(temp);
Il.Ldloca(temp);
var valueIsNullLabel = Il.DefineLabel("valueIsNull");
Il.Brfalse(valueIsNullLabel);
Il.Ldloca(temp);
EmitValueAccess(from);
if (to != fromArgument)
{
EmitConvert(fromArgument, to, check);
}
var doneLabel = Il.DefineLabel("done");
Il.Br(doneLabel);
MarkLabelAndSurroundWithSP(valueIsNullLabel);
EmitLoadDefaultValue(to);
MarkLabelAndSurroundWithSP(doneLabel);
}
}
else if (to.IsEnum || to == typeof(Enum))
{
EmitConvert(from, typeof(int), check);
}
else if (from.IsEnum || from == typeof(Enum))
{
EmitConvert(typeof(int), to, check);
}
else
{
if (!check)
{
EmitConvertValue(Il, from, to);
}
else
{
EmitConvertValueChecked(Il, from, to);
}
}
}
}
}