public override void Generate(ILGenerator gen)
{
switch (argNum)
{
case 0:
gen.Emit(OpCodes.Ldarg_0);
break;
case 1:
gen.Emit(OpCodes.Ldarg_1);
break;
case 2:
gen.Emit(OpCodes.Ldarg_2);
break;
case 3:
gen.Emit(OpCodes.Ldarg_3);
break;
default:
gen.Emit(OpCodes.Ldarg, argNum);
break;
}
if (type.IsByRef)
{
CodeGenerationHelper.LoadFromPtr(gen, type.GetElementType());
}
}
public override void Generate(ILGenerator gen)
{
array.Generate(gen);
index.Generate(gen);
Type t = array.GetResultType().GetElementType();
if (t.IsEnum && t != typeof(Enum))
{
t = t.UnderlyingSystemType;
}
switch (Type.GetTypeCode(t))
{
case TypeCode.Byte:
gen.Emit(OpCodes.Ldelem_U1);
break;
case TypeCode.Double:
gen.Emit(OpCodes.Ldelem_R8);
break;
case TypeCode.Int16:
gen.Emit(OpCodes.Ldelem_I2);
break;
case TypeCode.UInt32:
gen.Emit(OpCodes.Ldelem_U4);
break;
case TypeCode.Int32:
gen.Emit(OpCodes.Ldelem_I4);
break;
case TypeCode.UInt64:
case TypeCode.Int64:
gen.Emit(OpCodes.Ldelem_I8);
break;
case TypeCode.SByte:
gen.Emit(OpCodes.Ldelem_I1);
break;
case TypeCode.Single:
gen.Emit(OpCodes.Ldelem_R4);
break;
case TypeCode.UInt16:
gen.Emit(OpCodes.Ldelem_U2);
break;
default:
if (t.IsValueType)
{
gen.Emit(OpCodes.Ldelema, t);
CodeGenerationHelper.LoadFromPtr(gen, t);
}
else
{
gen.Emit(OpCodes.Ldelem_Ref);
}
break;
}
}
public override void Generate(ILGenerator gen)
{
exp.Generate(gen);
Type typeObj = exp.GetResultType();
if (type.IsAssignableFrom(typeObj))
{
if (typeObj.IsValueType)
{
gen.Emit(OpCodes.Box, typeObj);
}
return;
}
else if (type.IsValueType && typeObj == typeof(object))
{
// Unbox
gen.Emit(OpCodes.Unbox, type);
CodeGenerationHelper.LoadFromPtr(gen, type);
return;
}
else if (typeObj.IsAssignableFrom(type))
{
// Sub s = (Sub)base
gen.Emit(OpCodes.Castclass, type);
return;
}
else if (CodeGenerationHelper.IsNumber(type) && CodeGenerationHelper.IsNumber(typeObj))
{
switch (Type.GetTypeCode(type))
{
case TypeCode.Byte:
gen.Emit(OpCodes.Conv_U1);
return;
case TypeCode.Double:
gen.Emit(OpCodes.Conv_R8);
return;
case TypeCode.Int16:
gen.Emit(OpCodes.Conv_I2);
return;
case TypeCode.Int32:
gen.Emit(OpCodes.Conv_I4);
return;
case TypeCode.Int64:
gen.Emit(OpCodes.Conv_I8);
return;
case TypeCode.SByte:
gen.Emit(OpCodes.Conv_I1);
return;
case TypeCode.Single:
gen.Emit(OpCodes.Conv_R4);
return;
case TypeCode.UInt16:
gen.Emit(OpCodes.Conv_U2);
return;
case TypeCode.UInt32:
gen.Emit(OpCodes.Conv_U4);
return;
case TypeCode.UInt64:
gen.Emit(OpCodes.Conv_U8);
return;
}
}
MethodInfo imp = type.GetMethod("op_Implicit", new Type[] { typeObj });
if (imp != null)
{
gen.Emit(OpCodes.Call, imp);
return;
}
foreach (MethodInfo m in typeObj.GetMember("op_Explicit"))
{
if (m.ReturnType == type)
{
gen.Emit(OpCodes.Call, m);
return;
}
}
throw new InvalidOperationException("Can't cast from " + typeObj + " to " + type);
}
