/// <summary>
/// Emits code that loads current <see cref="PHP.Core.ScriptContext"/> by calling
/// <see cref="PHP.Core.ScriptContext.CurrentContext"/> and remembers it in a local.
/// </summary>
/// <param name="il"></param>
public void EmitLoad(ILEmitter il)
{
if (localBuilder == null)
{
localBuilder = il.DeclareLocal(typeof(ScriptContext));
il.EmitCall(OpCodes.Call, Methods.ScriptContext.GetCurrentContext, null);
il.Stloc(localBuilder);
}
il.Ldloc(localBuilder);
}
public static void EmitArgFullPreCall(ILEmitter/*!*/ il, IPlace/*!*/ stack, bool argsAware,
int formalParamCount, int formalTypeParamCount, out LocalBuilder locArgsCount)
{
if (argsAware)
{
locArgsCount = il.DeclareLocal(typeof(int));
// locArgsCount = stack.MakeArgsAware(<formal tpye param count | formal param count>);
stack.EmitLoad(il);
il.LdcI4((formalTypeParamCount << 16) | formalParamCount);
il.Emit(OpCodes.Call, Methods.PhpStack.MakeArgsAware);
il.Stloc(locArgsCount);
}
else
{
locArgsCount = null;
// CALL stack.RemoveFrame();
stack.EmitLoad(il);
il.Emit(OpCodes.Call, Methods.PhpStack.RemoveFrame);
}
}
/// <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;
}
protected virtual GetterDelegate/*!*/ GenerateGetterStub()
{
#if SILVERLIGHT
DynamicMethod stub = new DynamicMethod("<^GetterStub>", Types.Object[0], Types.Object);
#else
DynamicMethod stub = new DynamicMethod("<^GetterStub>", PhpFunctionUtils.DynamicStubAttributes, CallingConventions.Standard,
Types.Object[0], Types.Object, this.declaringType.RealType, true);
#endif
ILEmitter il = new ILEmitter(stub);
ClrEvent clr_event;
ClrProperty clr_property;
Type result_type;
if ((clr_event = Member as ClrEvent) != null)
{
Debug.Assert(!declaringType.RealType.IsValueType, "Value type with ClrEvent not handled! TODO: arg(0) is ClrValue<T>.");
LocalBuilder temp = il.DeclareLocal(declaringType.RealType);
il.Ldarg(0);
il.Emit(OpCodes.Castclass, declaringType.RealType);
il.Stloc(temp);
clr_event.EmitGetEventObject(il, new Place(null, Properties.ScriptContext_CurrentContext),
new Place(temp), true);
}
else
{
if ((clr_property = Member as ClrProperty) != null)
{
// return error-throwing getter if the property is write-only
if (!clr_property.HasGetter) return new GetterDelegate(MissingGetter);
if (!clr_property.Getter.IsStatic)
{
ClrOverloadBuilder.EmitLoadInstance(il, IndexedPlace.ThisArg, declaringType.RealType);
// il.Emit(OpCodes.Ldarg_0);
// if (declaringType.RealType.IsValueType)
// il.Emit(OpCodes.Unbox, declaringType.RealType);
//#if EMIT_VERIFIABLE_STUBS
// else
// il.Emit(OpCodes.Castclass, this.declaringType.RealType);
//#endif
}
il.Emit(OpCodes.Call, clr_property.Getter);
result_type = clr_property.Getter.ReturnType;
}
else
{
ClrField clr_field = ClrField;
if (!clr_field.FieldInfo.IsStatic)
{
ClrOverloadBuilder.EmitLoadInstance(il, IndexedPlace.ThisArg, declaringType.RealType);
//il.Emit(OpCodes.Ldarg_0);
////il.Emit(OpCodes.Castclass, this.declaringType.RealType);
//if (declaringType.RealType.IsValueType) il.Emit(OpCodes.Unbox, declaringType.RealType);
il.Emit(OpCodes.Ldfld, clr_field.FieldInfo);
}
else
{
il.Emit(OpCodes.Ldsfld, clr_field.FieldInfo);
}
result_type = clr_field.FieldInfo.FieldType;
}
il.EmitBoxing(ClrOverloadBuilder.EmitConvertToPhp(il, result_type/*, null*/));
}
il.Emit(OpCodes.Ret);
return (GetterDelegate)stub.CreateDelegate(typeof(GetterDelegate));
}
/// <summary>
/// Emits code that stores a value to this storage place.
/// </summary>
/// <param name="il">The <see cref="ILEmitter"/> to emit the code to.</param>
public void EmitStore(ILEmitter il)
{
switch (holder)
{
case PlaceHolder.Local: il.Stloc(index); break;
case PlaceHolder.Argument: il.Starg(index); break;
case PlaceHolder.None: throw new InvalidOperationException();
}
}
