/// <summary>
/// Converts a PHP value to the given CLR type that is a generic parameter.
/// </summary>
private static void EmitConvertToClrGeneric(ILEmitter/*!*/ il, Type/*!*/ formalType, LocalBuilder/*!*/ strictnessLocal)
{
Debug.Assert(formalType.IsGenericParameter);
// f...ing GenericTypeParameterBuilder will not allow us to read its attributes and constraints :(
if (!(formalType is GenericTypeParameterBuilder))
{
GenericParameterAttributes attrs = formalType.GenericParameterAttributes;
if (Reflection.Enums.GenericParameterAttrTest(attrs, GenericParameterAttributes.NotNullableValueTypeConstraint))
{
// we know that we are converting to a value type
il.Ldloca(strictnessLocal);
il.Emit(OpCodes.Call, Methods.ConvertToClr.TryObjectToStruct.MakeGenericMethod(formalType));
return;
}
Type[] constraints = formalType.GetGenericParameterConstraints();
for (int i = 0; i < constraints.Length; i++)
{
if (constraints[i].IsClass)
{
if (!constraints[i].IsArray && !typeof(Delegate).IsAssignableFrom(constraints[i]))
{
// we know that we are converting to a class that is not an array nor a delegate
il.Ldloca(strictnessLocal);
il.Emit(OpCodes.Call, Methods.ConvertToClr.TryObjectToClass.MakeGenericMethod(formalType));
return;
}
else break;
}
}
}
// postpone the conversion to runtime
il.Ldloca(strictnessLocal);
il.Emit(OpCodes.Call, Methods.Convert.TryObjectToType.MakeGenericMethod(formalType));
}
/// <summary>
/// Converts object to CLR type
/// </summary>
private static bool EmitConvertObjectToClr(ILEmitter il, PhpTypeCode typeCode, Type formalType, LocalBuilder strictnessLocal)
{
MethodInfo convert_method = null;
switch (Type.GetTypeCode(formalType))
{
case TypeCode.Boolean: if (typeCode != PhpTypeCode.Boolean)
convert_method = Methods.ConvertToClr.TryObjectToBoolean; break;
case TypeCode.Int32: if (typeCode != PhpTypeCode.Integer)
convert_method = Methods.ConvertToClr.TryObjectToInt32; break;
case TypeCode.Int64: if (typeCode != PhpTypeCode.LongInteger)
convert_method = Methods.ConvertToClr.TryObjectToInt64; break;
case TypeCode.Double: if (typeCode != PhpTypeCode.Double)
convert_method = Methods.ConvertToClr.TryObjectToDouble; break;
case TypeCode.String: if (typeCode != PhpTypeCode.String)
convert_method = Methods.ConvertToClr.TryObjectToString; break;
case TypeCode.SByte: convert_method = Methods.ConvertToClr.TryObjectToInt8; break;
case TypeCode.Int16: convert_method = Methods.ConvertToClr.TryObjectToInt16; break;
case TypeCode.Byte: convert_method = Methods.ConvertToClr.TryObjectToUInt8; break;
case TypeCode.UInt16: convert_method = Methods.ConvertToClr.TryObjectToUInt16; break;
case TypeCode.UInt32: convert_method = Methods.ConvertToClr.TryObjectToUInt32; break;
case TypeCode.UInt64: convert_method = Methods.ConvertToClr.TryObjectToUInt64; break;
case TypeCode.Single: convert_method = Methods.ConvertToClr.TryObjectToSingle; break;
case TypeCode.Decimal: convert_method = Methods.ConvertToClr.TryObjectToDecimal; break;
case TypeCode.Char: convert_method = Methods.ConvertToClr.TryObjectToChar; break;
case TypeCode.DateTime: convert_method = Methods.ConvertToClr.TryObjectToDateTime; break;
case TypeCode.DBNull: convert_method = Methods.ConvertToClr.TryObjectToDBNull; break;
case TypeCode.Object:
{
if (formalType.IsValueType)
{
if (formalType.IsGenericType && NullableType == formalType.GetGenericTypeDefinition())
{
// This is an ugly corner case (using generic TryObjectToStruct wouldn't work, because
// for nullables .IsValueType returns true, but it doesn't match "T : struct" constraint)!
// We have to try converting object to Nullable<T> first and then to T
// (which requires a new call to 'EmitConvertObjectToClr')
Type nullableArg = formalType.GetGenericArguments()[0];
Type nullableType = NullableType.MakeGenericType(nullableArg);
LocalBuilder tmpVar = il.DeclareLocal(typeof(object));
// This succeeds only for exact match
il.Emit(OpCodes.Call, Methods.ConvertToClr.UnwrapNullable);
il.Emit(OpCodes.Dup);
il.Stloc(tmpVar);
// <stack_0> = tmpVar = UnwrapNullable(...)
// if (<stack_0> != null)
Label lblNull = il.DefineLabel(), lblDone = il.DefineLabel();
il.Emit(OpCodes.Ldnull);
il.Emit(OpCodes.Beq, lblNull);
// {
// Convert tmpVar to T and wrap it into Nullable<T>
il.Ldloc(tmpVar);
bool ret = EmitConvertObjectToClr(il, typeCode, nullableArg, strictnessLocal);
// TODO: use reflection cache?
il.Emit(OpCodes.Newobj, nullableType.GetConstructors()[0]);
il.Emit(OpCodes.Br, lblDone);
// } else /* == null */ {
il.MarkLabel(lblNull);
// return (T?)null;
LocalBuilder tmpNull = il.DeclareLocal(nullableType);
il.Ldloca(tmpNull);
il.Emit(OpCodes.Initobj, nullableType);
il.Ldloc(tmpNull);
// }
il.MarkLabel(lblDone);
return ret;
}
else
convert_method = Methods.ConvertToClr.TryObjectToStruct.MakeGenericMethod(formalType);
}
else
{
if (formalType.IsArray)
convert_method = Methods.ConvertToClr.TryObjectToArray.MakeGenericMethod(formalType.GetElementType());
else if (typeof(Delegate).IsAssignableFrom(formalType))
convert_method = Methods.ConvertToClr.TryObjectToDelegate.MakeGenericMethod(formalType);
else
convert_method = Methods.ConvertToClr.TryObjectToClass.MakeGenericMethod(formalType);
}
break;
}
default:
Debug.Fail();
return true;
}
if (convert_method != null)
{
il.Ldloca(strictnessLocal);
il.Emit(OpCodes.Call, convert_method);
return false;
}
else return true;
}
/// <summary>
/// Emits code that loads address of this storage place.
/// </summary>
/// <param name="il">The <see cref="ILEmitter"/> to emit the code to.</param>
public void EmitLoadAddress(ILEmitter il)
{
switch (holder)
{
case PlaceHolder.Local: il.Ldloca(index); break;
case PlaceHolder.Argument: il.Ldarga(index); break;
case PlaceHolder.None: throw new InvalidOperationException();
}
}