/// <summary> /// Gets the prototype of objects constructed using this function. Equivalent to /// the Function.prototype property. /// </summary> public Library.Prototype GetInstancePrototype(ScriptEngine engine) { if (_RawInstancePrototype == null) { // Create one now! _RawInstancePrototype = engine.Prototypes.Create(); } return(_RawInstancePrototype); }
internal override void ResolveVariables(OptimizationInfo optimizationInfo) { base.ResolveVariables(optimizationInfo); // If this is an 'in' operator, resolve the prototype of the right property. if (OperatorType == OperatorType.In) { // Get the type of the RHS (the object being checked): Type rhsType = Right.GetResultType(optimizationInfo); // Get the proto for it: ResolvedPrototype = optimizationInfo.Engine.Prototypes.Get(rhsType); } }
internal override void ResolveVariables(OptimizationInfo optimizationInfo) { // Resolve kids too: base.ResolveVariables(optimizationInfo); // Is it an object literal? var properties = this.Value as List <KeyValuePair <Expression, Expression> >; if (properties == null) { // Not an object literal! How about an array? // Get the expressions: List <Expression> exprs = this.Value as List <Expression>; if (exprs == null) { // Not an array either! Quit there. return; } // For each one.. foreach (Expression expr in exprs) { // Resolve it: expr.ResolveVariables(optimizationInfo); } return; } if (CreatedPrototype != null) { // Already made it! return; } // We'll generate a prototype and a custom object type for it: CreatedPrototype = optimizationInfo.Engine.Prototypes.Create(); // We'll generate a prototype and a custom object type for it: Library.Prototype proto = CreatedPrototype; foreach (var keyValuePair in properties) { string propertyName = keyValuePair.Key.ToString(); Expression propertyValue = keyValuePair.Value; if (propertyValue is Expression) { // Add a new property to the object. var dataPropertyValue = (Expression)propertyValue; // Resolve it: dataPropertyValue.ResolveVariables(optimizationInfo); Type valueType = dataPropertyValue.GetResultType(optimizationInfo); // Create the property now: Library.PropertyVariable pv = proto.AddProperty(propertyName, Library.PropertyAttributes.FullAccess, valueType); // If it's a function value then it might be constant. // It might be a constant string/ number too, so track them as well. pv.TryLoadConstant(dataPropertyValue); } else { throw new InvalidOperationException("Invalid property value type in object literal."); } } }
/// <summary> /// Generates CIL for the expression. /// </summary> /// <param name="generator"> The generator to output the CIL to. </param> /// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param> public override void GenerateCode(ILGenerator generator, OptimizationInfo optimizationInfo) { // Get the target as a name expression: NameExpression nameExpr = Target as NameExpression; // Grab if this is a 'new' call: bool isConstructor = optimizationInfo.IsConstructCall; optimizationInfo.IsConstructCall = false; if (ResolvedMethod != null) { // We have a known method! if (UserDefined != null) { if (isConstructor) { // Generate code to produce the "this" value. Library.Prototype proto = UserDefined.GetInstancePrototype(optimizationInfo.Engine); // Create the object now: generator.NewObject(proto.TypeConstructor); // Duplicate (which will act as our return value): if (optimizationInfo.RootExpression != this) { generator.Duplicate(); } } else { // There are three cases for non-constructor calls. if (this.Target is NameExpression) { // 1. The function is a name expression (e.g. "parseInt()"). // In this case this = scope.ImplicitThisValue, if there is one, otherwise undefined. ((NameExpression)this.Target).GenerateThis(generator); } else if (this.Target is MemberAccessExpression) { // 2. The function is a member access expression (e.g. "Math.cos()"). // In this case this = Math. var baseExpression = ((MemberAccessExpression)this.Target).Base; baseExpression.GenerateCode(generator, optimizationInfo); EmitConversion.ToAny(generator, baseExpression.GetResultType(optimizationInfo)); } else { // 3. Neither of the above (e.g. "(function() { return 5 })()") // In this case this = undefined. EmitHelpers.EmitUndefined(generator); } } } // Emit the rest of the args: EmitArguments(generator, optimizationInfo); // Got a return type? Type returnType = GetResultType(optimizationInfo); // Then the call! if (typeof(System.Reflection.ConstructorInfo).IsAssignableFrom(ResolvedMethod.GetType())) { // Actual constructor call: generator.NewObject(ResolvedMethod as System.Reflection.ConstructorInfo); } else { // Ordinary method: generator.Call(ResolvedMethod); } if (isConstructor) { // Always a returned value here. Needed? if (optimizationInfo.RootExpression == this) { // Remove the return value: generator.Pop(); } } else { if (returnType == typeof(Nitrassic.Undefined)) { if (optimizationInfo.RootExpression != this) { // Put undef on the stack: EmitHelpers.EmitUndefined(generator); } } else if (optimizationInfo.RootExpression == this) { // Remove the return value: generator.Pop(); } } } else { // Either runtime resolve it or it's not actually a callable function throw new NotImplementedException("A function was called which was not supported (" + ToString() + ")"); } }
/// <summary> /// Generates CIL for the expression. /// </summary> /// <param name="generator"> The generator to output the CIL to. </param> /// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param> public override void GenerateCode(ILGenerator generator, OptimizationInfo optimizationInfo) { // Literals cannot have side-effects so if a return value is not expected then generate // nothing. if (optimizationInfo.RootExpression == this) { return; } if (this.Value is int) { generator.LoadInt32((int)this.Value); } else if (this.Value is double) { generator.LoadDouble((double)this.Value); } else if (this.Value is string) { generator.LoadString((string)this.Value); } else if (this.Value is bool) { generator.LoadBoolean((bool)this.Value); } else if (this.Value is RegularExpressionLiteral) { // RegExp var sharedRegExpVariable = optimizationInfo.GetRegExpVariable(generator, (RegularExpressionLiteral)this.Value); var label1 = generator.CreateLabel(); var label2 = generator.CreateLabel(); // if (sharedRegExp == null) { generator.LoadVariable(sharedRegExpVariable); generator.LoadNull(); generator.BranchIfNotEqual(label1); // sharedRegExp = Global.RegExp.OnConstruct(source, flags) EmitHelpers.LoadPrototypes(generator); generator.LoadField(ReflectionHelpers.PrototypeLookup_RegExp); generator.LoadString(((RegularExpressionLiteral)this.Value).Pattern); generator.LoadString(((RegularExpressionLiteral)this.Value).Flags); generator.Call(ReflectionHelpers.RegExp_Construct); generator.Duplicate(); generator.StoreVariable(sharedRegExpVariable); // } else { generator.Branch(label2); generator.DefineLabelPosition(label1); // Global.RegExp.OnConstruct(sharedRegExp, flags) EmitHelpers.LoadPrototypes(generator); generator.LoadField(ReflectionHelpers.PrototypeLookup_RegExp); generator.LoadVariable(sharedRegExpVariable); generator.LoadNull(); generator.Call(ReflectionHelpers.RegExp_Construct); // } generator.DefineLabelPosition(label2); } else if (this.Value == Null.Value) { // Null. EmitHelpers.EmitNull(generator); } else if (this.Value == Undefined.Value) { // Undefined. EmitHelpers.EmitUndefined(generator); } else if (this.Value is List <Expression> ) { // Construct an array literal. var arrayLiteral = (List <Expression>) this.Value; // Operands for ArrayConstructor.New() are: an ArrayConstructor instance (ArrayConstructor), an array (object[]) // ArrayConstructor EmitHelpers.LoadEngine(generator); // object[] generator.LoadInt32(arrayLiteral.Count); generator.NewArray(typeof(object)); for (int i = 0; i < arrayLiteral.Count; i++) { // Operands for StoreArrayElement() are: an array (object[]), index (int), value (object). // Array generator.Duplicate(); // Index generator.LoadInt32(i); // Value var elementExpression = arrayLiteral[i]; if (elementExpression == null) { generator.LoadNull(); } else { elementExpression.GenerateCode(generator, optimizationInfo); EmitConversion.ToAny(generator, elementExpression.GetResultType(optimizationInfo)); } // Store the element value. generator.StoreArrayElement(typeof(object)); } // ArrayConstructor.New(object[]) generator.Call(ReflectionHelpers.Array_New); } else if (this.Value is List <KeyValuePair <Expression, Expression> > ) { // This is an object literal. var properties = (List <KeyValuePair <Expression, Expression> >) this.Value; // We'll generate a prototype and a custom object type for it: Library.Prototype proto = CreatedPrototype; // Create a new object. generator.NewObject(proto.TypeConstructor); foreach (var keyValuePair in properties) { string propertyName = keyValuePair.Key.ToString(); Expression propertyValue = keyValuePair.Value; // Duplicate the object ref: generator.Duplicate(); // Add a new property to the object. Type valueType = propertyValue.GetResultType(optimizationInfo); // Get the property: Library.PropertyVariable pv = proto.GetProperty(propertyName); // Set it: pv.Set(generator, optimizationInfo, false, valueType, delegate(bool two){ if (pv.IsConstant) { // Emit the constant: EmitHelpers.EmitValue(generator, pv.ConstantValue); } else { // Write the value to set now: propertyValue.GenerateCode(generator, optimizationInfo); } // Note: This one always ignores 'two' }); } } else { throw new NotImplementedException("Unknown literal type."); } }