C# mdr类代码示例

 // ECMA-262 section 15.6.4.3
 private static void valueOf(ref mdr.CallFrame callFrame)
 {
   Debug.WriteLine("Calling JSBoolean.valueOf");
   if (callFrame.This.ValueType != mdr.ValueTypes.Boolean)
     throw new Exception("Boolean.prototype.valueOf is not generic");
   callFrame.Return.Set(callFrame.This.ToBoolean());
 }

 public static void CreateFunction(ref mdr.CallFrame callFrame, int funcDefIndex, mdr.DObject context, ref Stack stack)
 {
   //Debug.WriteLine("calling Exec.CreateFunction");
   var funcDef = ((JSFunctionMetadata)callFrame.Function.Metadata).SubFunctions[funcDefIndex];
   var func = new mdr.DFunction(funcDef, context);
   stack.Items[stack.Sp++].Set(func); ;
 }

 public virtual mdr.DObject Construct(mdr.DFunction func)
 {
     if (_construct != null)
         return _construct(func);
     else
         return base.Construct(func);
 }

        internal static void EvalString(string inputString, ref mdr.DValue result, mdr.DFunction callerFunction = null, mdr.DObject callerContext = null, mdr.DObject thisArg = null)
        {
          var funcMetadata = JSParser.ParseScript(inputString).Expression.Metadata;
          var func = new mdr.DFunction(funcMetadata, null);

          var tempCallFrame = new mdr.CallFrame();
          bool isDirectEval = callerContext != null;

          if (isDirectEval)
          {
            //function will behave as if it was the caller
            Debug.Assert(thisArg != null && callerFunction != null && callerContext != null, "Invalid situation! Direct eval call must have thisArg, callerFunction, callerContext set");
            funcMetadata.Scope.IsProgram = false;
            funcMetadata.Scope.IsEvalFunction = true;
            funcMetadata.ParentFunction = (JSFunctionMetadata)callerFunction.Metadata;
            tempCallFrame.CallerContext = callerContext;
            tempCallFrame.This = thisArg;
          }
          else
          {
            //This will behave just like a program code
            tempCallFrame.CallerContext = mdr.Runtime.Instance.GlobalContext;
            tempCallFrame.This = (mdr.Runtime.Instance.GlobalContext);
          }

          //TODO: find a way to assign a name to this
          //funcMetadata.Name += "_eval"; //After we know the ParentFunction

          tempCallFrame.Function = func;
          tempCallFrame.Signature = mdr.DFunctionSignature.EmptySignature;
          func.Call(ref tempCallFrame);
          result.Set(ref tempCallFrame.Return);
        }

 public static bool CallProperty(mdr.DObject input, string propName, out mdr.DValue output)
 {
   if (input != null)
   {
     var propDesc = input.GetPropertyDescriptor(propName);
     var prop = new mdr.DValue();
     propDesc.Get(input, ref prop);
     mdr.DFunction func = null;
     if (prop.ValueType == mdr.ValueTypes.Function)
     {
       func = prop.AsDFunction();
       //if (toString != null)
       //{
       mdr.CallFrame callFrame = new mdr.CallFrame();
       callFrame.This = (input);
       callFrame.Function = func;
       func.Call(ref callFrame);
       if (ValueTypesHelper.IsPrimitive(callFrame.Return.ValueType))
       {
         output = callFrame.Return;
         return true;
       }
     }
   }
   output = new mdr.DValue();
   output.SetUndefined();
   return false;
 }

        public JSTypedArrayBase(mdr.DObject prototype, string arrayname, int typesize)
            : base(prototype, arrayname)
        {
            TypeSize = typesize;
            
            TargetPrototype.DefineOwnProperty("length", new mdr.DProperty() {
                TargetValueType = mdr.ValueTypes.Int32,
                OnGetDValue = (mdr.DObject This, ref mdr.DValue v) => {
                    v.Set((This as DTypedArray).ByteLength / TypeSize);
                },
                OnSetDValue = (mdr.DObject This, ref mdr.DValue v) => { /* do nothing */ },
                OnSetInt = (mdr.DObject This, int v) => { /* do nothing */ },
            });

            TargetPrototype.DefineOwnProperty("byteLength", new mdr.DProperty() {
                TargetValueType = mdr.ValueTypes.Int32,
                OnGetDValue = (mdr.DObject This, ref mdr.DValue v) => {
                    v.Set((This as DTypedArray).ByteLength);
                },
                OnSetDValue = (mdr.DObject This, ref mdr.DValue v) => { /* do nothing */ },
                OnSetInt = (mdr.DObject This, int v) => { /* do nothing */ },
            });

            // Constants
            this.DefineOwnProperty("BYTES_PER_ELEMENT", TypeSize, mdr.PropertyDescriptor.Attributes.NotConfigurable | mdr.PropertyDescriptor.Attributes.NotWritable | mdr.PropertyDescriptor.Attributes.NotEnumerable | mdr.PropertyDescriptor.Attributes.Data);
            TargetPrototype.DefineOwnProperty("BYTES_PER_ELEMENT", TypeSize, mdr.PropertyDescriptor.Attributes.NotConfigurable | mdr.PropertyDescriptor.Attributes.NotWritable | mdr.PropertyDescriptor.Attributes.NotEnumerable | mdr.PropertyDescriptor.Attributes.Data);
        }

        internal static void Init(mdr.DObject obj)
        {

            obj.SetField("global", obj);
            //obj.SetField("null", mdr.Runtime.Instance.DefaultDNull);
            obj.DefineOwnProperty("undefined", mdr.Runtime.Instance.DefaultDUndefined, mdr.PropertyDescriptor.Attributes.Data | mdr.PropertyDescriptor.Attributes.NotWritable | mdr.PropertyDescriptor.Attributes.NotEnumerable | mdr.PropertyDescriptor.Attributes.NotConfigurable);
            obj.DefineOwnProperty("NaN", double.NaN, mdr.PropertyDescriptor.Attributes.Data | mdr.PropertyDescriptor.Attributes.NotWritable | mdr.PropertyDescriptor.Attributes.NotEnumerable | mdr.PropertyDescriptor.Attributes.NotConfigurable);
            obj.DefineOwnProperty("Infinity", double.PositiveInfinity, mdr.PropertyDescriptor.Attributes.Data | mdr.PropertyDescriptor.Attributes.NotWritable | mdr.PropertyDescriptor.Attributes.NotEnumerable | mdr.PropertyDescriptor.Attributes.NotConfigurable);

            obj.SetField("Object", new JSObject());
            obj.SetField("Function", new JSFunction());
            obj.SetField("Array", new JSArray());
            obj.SetField("ArrayBuffer", new JSArrayBuffer());
            obj.SetField("Int8Array", new JSInt8Array());
            obj.SetField("Uint8Array", new JSUint8Array());
            obj.SetField("Int16Array", new JSInt16Array());
            obj.SetField("Uint16Array", new JSUint16Array());
            obj.SetField("Int32Array", new JSInt32Array());
            obj.SetField("Uint32Array", new JSUint32Array());
            obj.SetField("Float32Array", new JSFloat32Array());
            obj.SetField("Float64Array", new JSFloat64Array());

            obj.SetField("Math", new JSMath());
            obj.SetField("String", new JSString());
            obj.SetField("Number", new JSNumber());
            obj.SetField("Date", new JSDate());
            obj.SetField("Boolean", new JSBoolean());
            obj.SetField("Error", new JSError());
            obj.SetField("RegExp", new JSRegExp());

            obj.SetField("eval", BuiltinEval);

            AddStandardMethods(obj);
            AddExtendedMethods(obj);
        }

 public JSBuiltinFunctionImp(mdr.DFuncImpInstance.JittedMethod m, Constructor c)
     : base(null, null) //base(m.Method.Name, null, null)
 {
     Name = m.Method.Name;
     _method = m;
     _construct = c;
 }

 // i0 ? i1 : i2
 public static void Run(ref mdr.DValue i0, ref mdr.DValue i1, ref mdr.DValue i2, ref mdr.DValue result)
 {
     if (Operations.Convert.ToBoolean.Run(ref i0))
         result.Set(ref i1);
     else
         result.Set(ref i2);
 }

    public static mdr.DArray CreateArgumentsObject(ref mdr.CallFrame callFrame, mdr.DObject context)
    {
      var metadata = (JSFunctionMetadata)callFrame.Function.Metadata;
      Debug.Assert(metadata.Scope.HasArgumentsSymbol, "Invalid situation, created arguments for the wrong scope!");
      mdr.DArray arguments = null;
      if (metadata.Scope.IsEvalFunction)
      {
        //Read from context
        var tmp = new mdr.DValue();
        context.GetField(JSFunctionArguments.Name, ref tmp);
        arguments = tmp.AsDArray();
      }
      else
      {
        arguments = CreateArgumentsObject(ref callFrame);
        var parameters = metadata.FunctionIR.Parameters;
        Debug.Assert(arguments.Length >= parameters.Count, "arguments array is not large enough to hold all arguments.");
        for (var i = parameters.Count - 1; i >= 0; --i)
        {
          var symbol = parameters[i].Symbol;
          var paramIndex = symbol.ParameterIndex;
          Debug.Assert(paramIndex == i, "Invalid situation!, Parameter indexes don't match!");

          if (symbol.SymbolType == JSSymbol.SymbolTypes.ClosedOnLocal)
          {
            var pd = context.AddOwnPropertyDescriptorByFieldId(symbol.FieldId, mdr.PropertyDescriptor.Attributes.Accessor | mdr.PropertyDescriptor.Attributes.NotConfigurable);
            context.Fields[pd.Index].Set(new ArgumentAccessor(arguments, paramIndex));
          }
        }
        if (metadata.Scope.HasEval)
          context.SetField(JSFunctionArguments.Name, arguments);
      }
      return arguments;
    }

 public static string GetEventHandlerAttr(mdr.DObject obj, string name)
 {
     var ehp = obj.GetPropertyDescriptor(name).GetProperty() as EventHandlerProperty;
     if (ehp == null)
         throw new Exception("Invalid Event " + name);
     return GetEventHandlerAttr(obj, ehp.EventType, name);
 }

 public static mdr.DObject CheckUndefined(mdr.DObject obj)
 {
     // In case of calling "item" method on lists, a returned null should be converted to undefined.
     if (obj == null)
         return mdr.Runtime.Instance.DefaultDUndefined;
     else
         return obj;
 }

 protected DTypedArray(mdr.DObject prototype, DArrayBuffer array, int byteoffset, int bytelength, int typesize)
     : base(prototype)
 {
     ByteOffset_ = byteoffset;
     TypeSize_ = typesize;
     ByteLength_ = bytelength;
     Elements_ = array.Elements_;
 }

 public void Add(mdr.DFunction f, bool useCapture)
 {
     if (_listeners == null)
         _listeners = new List<mdr.DFunction>();
     _listeners.Add(f);
     if (useCapture)
         _useCaptures.Add(f);
 }

 public DArrayBuffer(mdr.DObject prototype, int bytesize)
     : base(prototype)
 {
     ByteLength_ = Math.Min(bytesize, MaxElementsCount);
     Elements_ = new byte[ByteLength_];
     for (int i = 0; i < ByteLength_; ++i)
         Elements_[i] = 0x00;
 }