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public static ToObject ( |
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| generator | The IL generator. | |
| fromType | PrimitiveType | The type to convert from. |
| optimizationInfo | Information about the line number, function and path. | |
| return | void | |
/// <summary>
/// Deletes the reference and pushes <c>true</c> if the delete succeeded, or <c>false</c>
/// if the delete failed.
/// </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 void GenerateDelete(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Load the left-hand side and convert to an object instance.
var lhs = this.GetOperand(0);
lhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToObject(generator, lhs.ResultType, optimizationInfo);
// Load the property name and convert to a string.
var rhs = this.GetOperand(1);
if (this.OperatorType == OperatorType.MemberAccess && rhs is NameExpression)
{
generator.LoadString((rhs as NameExpression).Name);
}
else
{
rhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToString(generator, rhs.ResultType);
}
// Call Delete()
generator.LoadBoolean(optimizationInfo.StrictMode);
generator.Call(ReflectionHelpers.ObjectInstance_Delete);
// If the return value is not wanted then pop it from the stack.
//if (optimizationInfo.SuppressReturnValue == true)
// generator.Pop();
}
/// <summary>
/// Outputs the values needed to get or set this reference.
/// </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 void GenerateReference(ILGenerator generator, OptimizationInfo optimizationInfo)
{
string propertyName = null;
TypeOfMemberAccess memberAccessType = DetermineTypeOfMemberAccess(optimizationInfo, out propertyName);
if (memberAccessType == TypeOfMemberAccess.ArrayIndex)
{
// Array indexer
// -------------
// Load the left-hand side and convert to an object instance.
var lhs = this.GetOperand(0);
lhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToObject(generator, lhs.ResultType, optimizationInfo);
// Load the right-hand side and convert to a uint32.
var rhs = this.GetOperand(1);
rhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToUInt32(generator, rhs.ResultType);
}
else if (memberAccessType == TypeOfMemberAccess.Static)
{
// Named property access (e.g. x = y.property or x = y['property'])
// ----------------------------------------------------------------
// Load the left-hand side and convert to an object instance.
var lhs = this.GetOperand(0);
lhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToObject(generator, lhs.ResultType, optimizationInfo);
}
else
{
// Dynamic property access
// -----------------------
// Load the left-hand side and convert to an object instance.
var lhs = this.GetOperand(0);
lhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToObject(generator, lhs.ResultType, optimizationInfo);
// Load the value and convert it to a string.
var rhs = this.GetOperand(1);
rhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToString(generator, rhs.ResultType);
}
}
/// <summary>
/// Deletes the reference and pushes <c>true</c> if the delete succeeded, or <c>false</c>
/// if the delete failed.
/// </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 void GenerateDelete(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Load the left-hand side and convert to an object instance.
var lhs = this.GetOperand(0);
if (lhs is SuperExpression)
{
// Deleting a super reference is not allowed.
EmitHelpers.EmitThrow(generator, ErrorType.ReferenceError, "Unsupported reference to 'super'.");
generator.LoadNull(); // Extraneous, but helps with verification.
return;
}
lhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToObject(generator, lhs.ResultType, optimizationInfo);
// Load the property name and convert to a string.
var rhs = this.GetOperand(1);
if (this.OperatorType == OperatorType.MemberAccess)
{
// delete a.b
if (rhs is NameExpression nameExpession)
{
generator.LoadString(nameExpession.Name);
}
else
{
throw new SyntaxErrorException("Invalid member access", optimizationInfo.SourceSpan.StartLine, optimizationInfo.Source.Path, optimizationInfo.FunctionName);
}
}
else
{
// delete a['1']
rhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToPropertyKey(generator, rhs.ResultType);
}
// Call Delete()
generator.LoadBoolean(optimizationInfo.StrictMode);
generator.Call(ReflectionHelpers.ObjectInstance_Delete);
// If the return value is not wanted then pop it from the stack.
//if (optimizationInfo.SuppressReturnValue == true)
// generator.Pop();
}
/// <summary>
/// Generates code that creates a new scope.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
/// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param>
internal override void GenerateScopeCreation(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Create a new runtime object scope.
EmitHelpers.LoadScope(generator); // parent scope
if (this.ScopeObjectExpression == null)
{
EmitHelpers.LoadScriptEngine(generator);
generator.Call(ReflectionHelpers.ScriptEngine_Global);
}
else
{
this.ScopeObjectExpression.GenerateCode(generator, optimizationInfo);
EmitConversion.ToObject(generator, this.ScopeObjectExpression.ResultType, optimizationInfo);
}
generator.LoadBoolean(this.ProvidesImplicitThisValue);
generator.LoadBoolean(this.CanDeclareVariables);
generator.Call(ReflectionHelpers.ObjectScope_CreateRuntimeScope);
// Save the new scope.
EmitHelpers.StoreScope(generator);
}
/// <summary>
/// Generates IL for the script.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
/// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param>
protected override void GenerateCode(ILGenerator generator, OptimizationInfo optimizationInfo)
{
// Method signature: object FunctionDelegate(Compiler.Scope scope, object thisObject, Library.FunctionInstance functionObject, object[] arguments)
// Initialize the scope (note: the initial scope for a function is always declarative).
this.InitialScope.GenerateScopeCreation(generator, optimizationInfo);
// Verify the scope is correct.
VerifyScope(generator);
// In ES3 the "this" value must be an object. See 10.4.3 in the spec.
if (this.StrictMode == false && this.MethodOptimizationHints.HasThis == true)
{
// if (thisObject == null || thisObject == Null.Value || thisObject == Undefined.Value)
EmitHelpers.LoadThis(generator);
generator.LoadNull();
generator.CompareEqual();
EmitHelpers.LoadThis(generator);
EmitHelpers.EmitNull(generator);
generator.CompareEqual();
generator.BitwiseOr();
EmitHelpers.LoadThis(generator);
EmitHelpers.EmitUndefined(generator);
generator.CompareEqual();
generator.BitwiseOr();
// {
var startOfFalse = generator.CreateLabel();
generator.BranchIfFalse(startOfFalse);
// thisObject = engine.Global;
EmitHelpers.LoadScriptEngine(generator);
generator.Call(ReflectionHelpers.ScriptEngine_Global);
// } else {
var endOfIf = generator.CreateLabel();
generator.Branch(endOfIf);
generator.DefineLabelPosition(startOfFalse);
// thisObject = TypeConverter.ToObject(thisObject);
EmitHelpers.LoadThis(generator);
EmitConversion.ToObject(generator, PrimitiveType.Any, optimizationInfo);
// }
generator.DefineLabelPosition(endOfIf);
EmitHelpers.StoreThis(generator);
}
// Transfer the function name into the scope.
if (string.IsNullOrEmpty(this.Name) == false &&
this.IncludeNameInScope == true &&
this.ArgumentNames.Contains(this.Name) == false &&
optimizationInfo.MethodOptimizationHints.HasVariable(this.Name))
{
EmitHelpers.LoadFunction(generator);
var functionName = new NameExpression(this.InitialScope, this.Name);
functionName.GenerateSet(generator, optimizationInfo, PrimitiveType.Any, false);
}
// Transfer the arguments object into the scope.
if (this.MethodOptimizationHints.HasArguments == true && this.ArgumentNames.Contains("arguments") == false)
{
// prototype
EmitHelpers.LoadScriptEngine(generator);
generator.Call(ReflectionHelpers.ScriptEngine_Object);
generator.Call(ReflectionHelpers.FunctionInstance_InstancePrototype);
// callee
EmitHelpers.LoadFunction(generator);
generator.CastClass(typeof(Library.UserDefinedFunction));
// scope
EmitHelpers.LoadScope(generator);
generator.CastClass(typeof(DeclarativeScope));
// argumentValues
EmitHelpers.LoadArgumentsArray(generator);
generator.NewObject(ReflectionHelpers.Arguments_Constructor);
var arguments = new NameExpression(this.InitialScope, "arguments");
arguments.GenerateSet(generator, optimizationInfo, PrimitiveType.Any, false);
}
// Transfer the argument values into the scope.
// Note: the arguments array can be smaller than expected.
if (this.ArgumentNames.Count > 0)
{
var endOfArguments = generator.CreateLabel();
for (int i = 0; i < this.ArgumentNames.Count; i++)
{
// Check if a duplicate argument name exists.
bool duplicate = false;
for (int j = i + 1; j < this.ArgumentNames.Count; j++)
{
if (this.ArgumentNames[i] == this.ArgumentNames[j])
{
duplicate = true;
break;
}
}
if (duplicate == true)
{
continue;
}
// Check if an array element exists.
EmitHelpers.LoadArgumentsArray(generator);
generator.LoadArrayLength();
generator.LoadInt32(i);
generator.BranchIfLessThanOrEqual(endOfArguments);
// Store the array element in the scope.
EmitHelpers.LoadArgumentsArray(generator);
generator.LoadInt32(i);
generator.LoadArrayElement(typeof(object));
var argument = new NameExpression(this.InitialScope, this.ArgumentNames[i]);
argument.GenerateSet(generator, optimizationInfo, PrimitiveType.Any, false);
}
generator.DefineLabelPosition(endOfArguments);
}
// Initialize any declarations.
this.InitialScope.GenerateDeclarations(generator, optimizationInfo);
//EmitHelpers.LoadScope(generator);
//EmitConversion.ToObject(generator, PrimitiveType.Any);
//generator.Pop();
// Generate code for the body of the function.
this.AbstractSyntaxTree.GenerateCode(generator, optimizationInfo);
// Define the return target - this is where the return statement jumps to.
// ReturnTarget can be null if there were no return statements.
if (optimizationInfo.ReturnTarget != null)
{
generator.DefineLabelPosition(optimizationInfo.ReturnTarget);
}
// Load the return value. If the variable is null, there were no return statements.
if (optimizationInfo.ReturnVariable != null)
{
// Return the value stored in the variable. Will be null if execution hits the end
// of the function without encountering any return statements.
generator.LoadVariable(optimizationInfo.ReturnVariable);
}
else
{
// There were no return statements - return null.
generator.LoadNull();
}
}
/// <summary>
/// Pushes the value of the reference onto the stack.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
/// <param name="optimizationInfo"> Information about any optimizations that should be performed. </param>
/// <param name="throwIfUnresolvable"> <c>true</c> to throw a ReferenceError exception if
/// the name is unresolvable; <c>false</c> to output <c>null</c> instead. </param>
public void GenerateGet(ILGenerator generator, OptimizationInfo optimizationInfo, bool throwIfUnresolvable)
{
string propertyName = null;
bool isArrayIndex = false;
// Right-hand-side can be a property name (a.b)
if (this.OperatorType == OperatorType.MemberAccess)
{
var rhs = this.GetOperand(1) as NameExpression;
if (rhs == null)
{
throw new JavaScriptException(optimizationInfo.Engine, "SyntaxError", "Invalid member access", optimizationInfo.SourceSpan.StartLine, optimizationInfo.Source.Path, optimizationInfo.FunctionName);
}
propertyName = rhs.Name;
}
// Or a constant indexer (a['b'])
if (this.OperatorType == OperatorType.Index)
{
var rhs = this.GetOperand(1) as LiteralExpression;
if (rhs != null && (PrimitiveTypeUtilities.IsNumeric(rhs.ResultType) || rhs.ResultType == PrimitiveType.String))
{
propertyName = TypeConverter.ToString(rhs.Value);
// Or a array index (a[0])
if (rhs.ResultType == PrimitiveType.Int32 || (propertyName != null && Library.ArrayInstance.ParseArrayIndex(propertyName) != uint.MaxValue))
{
isArrayIndex = true;
}
}
}
if (isArrayIndex == true)
{
// Array indexer
// -------------
// xxx = object[index]
// Load the left-hand side and convert to an object instance.
var lhs = this.GetOperand(0);
lhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToObject(generator, lhs.ResultType, optimizationInfo);
// Load the right-hand side and convert to a uint32.
var rhs = this.GetOperand(1);
rhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToUInt32(generator, rhs.ResultType);
// Call the indexer.
generator.Call(ReflectionHelpers.ObjectInstance_GetPropertyValue_Int);
}
else if (propertyName != null)
{
//// Load the left-hand side and convert to an object instance.
//var lhs = this.GetOperand(0);
//lhs.GenerateCode(generator, optimizationInfo);
//EmitConversion.ToObject(generator, lhs.ResultType);
//// Call Get(string)
//generator.LoadString(propertyName);
//generator.Call(ReflectionHelpers.ObjectInstance_GetPropertyValue_String);
// Named property access (e.g. x = y.property)
// -------------------------------------------
// __object_cacheKey = null;
// __object_property_cachedIndex = 0;
// ...
// if (__object_cacheKey != object.InlineCacheKey)
// xxx = object.InlineGetPropertyValue("property", out __object_property_cachedIndex, out __object_cacheKey)
// else
// xxx = object.InlinePropertyValues[__object_property_cachedIndex];
// Load the left-hand side and convert to an object instance.
var lhs = this.GetOperand(0);
lhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToObject(generator, lhs.ResultType, optimizationInfo);
// TODO: share these variables somehow.
var cacheKey = generator.DeclareVariable(typeof(object));
var cachedIndex = generator.DeclareVariable(typeof(int));
// Store the object into a temp variable.
var objectInstance = generator.DeclareVariable(PrimitiveType.Object);
generator.StoreVariable(objectInstance);
// if (__object_cacheKey != object.InlineCacheKey)
generator.LoadVariable(cacheKey);
generator.LoadVariable(objectInstance);
generator.Call(ReflectionHelpers.ObjectInstance_InlineCacheKey);
var elseClause = generator.CreateLabel();
generator.BranchIfEqual(elseClause);
// value = object.InlineGetProperty("property", out __object_property_cachedIndex, out __object_cacheKey)
generator.LoadVariable(objectInstance);
generator.LoadString(propertyName);
generator.LoadAddressOfVariable(cachedIndex);
generator.LoadAddressOfVariable(cacheKey);
generator.Call(ReflectionHelpers.ObjectInstance_InlineGetPropertyValue);
var endOfIf = generator.CreateLabel();
generator.Branch(endOfIf);
// else
generator.DefineLabelPosition(elseClause);
// value = object.InlinePropertyValues[__object_property_cachedIndex];
generator.LoadVariable(objectInstance);
generator.Call(ReflectionHelpers.ObjectInstance_InlinePropertyValues);
generator.LoadVariable(cachedIndex);
generator.LoadArrayElement(typeof(object));
// End of the if statement
generator.DefineLabelPosition(endOfIf);
}
else
{
// Dynamic property access
// -----------------------
// xxx = object.Get(x)
// Load the left-hand side and convert to an object instance.
var lhs = this.GetOperand(0);
lhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToObject(generator, lhs.ResultType, optimizationInfo);
// Load the property name and convert to a string.
var rhs = this.GetOperand(1);
rhs.GenerateCode(generator, optimizationInfo);
EmitConversion.ToString(generator, rhs.ResultType);
// Call Get(string)
generator.Call(ReflectionHelpers.ObjectInstance_GetPropertyValue_String);
}
}
/// <summary>
/// Generates CIL for the statement.
/// </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)
{
// Generate code for the start of the statement.
var statementLocals = new StatementLocals()
{
NonDefaultBreakStatementBehavior = true, NonDefaultSourceSpanBehavior = true
};
GenerateStartOfStatement(generator, optimizationInfo, statementLocals);
// Construct a loop expression.
// var iterator = TypeUtilities.GetIterator(obj);
// while (true) {
// continue-target:
// if (enumerator.MoveNext() == false)
// goto break-target;
// lhs = enumerator.Current;
//
// <body statements>
// }
// break-target:
// Call: ObjectInstance GetIterator(ScriptEngine engine, ObjectInstance iterable)
// Then call: IEnumerable<object> Iterate(ScriptEngine engine, ObjectInstance iterator)
optimizationInfo.MarkSequencePoint(generator, this.TargetObjectSourceSpan);
EmitHelpers.LoadScriptEngine(generator);
generator.Duplicate();
this.TargetObject.GenerateCode(generator, optimizationInfo);
EmitConversion.ToObject(generator, this.TargetObject.ResultType, optimizationInfo);
generator.Call(ReflectionHelpers.TypeUtilities_GetIterator);
generator.Call(ReflectionHelpers.TypeUtilities_Iterate);
// Call IEnumerable<object>.GetEnumerator()
generator.Call(ReflectionHelpers.IEnumerable_Object_GetEnumerator);
// Store the enumerator in a temporary variable.
var enumerator = generator.CreateTemporaryVariable(typeof(IEnumerator <object>));
generator.StoreVariable(enumerator);
var breakTarget = generator.CreateLabel();
var continueTarget = generator.DefineLabelPosition();
// Emit debugging information.
if (optimizationInfo.DebugDocument != null)
{
generator.MarkSequencePoint(optimizationInfo.DebugDocument, this.VariableSourceSpan);
}
// if (enumerator.MoveNext() == false)
// goto break-target;
generator.LoadVariable(enumerator);
generator.Call(ReflectionHelpers.IEnumerator_MoveNext);
generator.BranchIfFalse(breakTarget);
// lhs = enumerator.Current;
generator.LoadVariable(enumerator);
generator.Call(ReflectionHelpers.IEnumerator_Object_Current);
this.Variable.GenerateSet(generator, optimizationInfo, PrimitiveType.Any, false);
// Emit the body statement(s).
optimizationInfo.PushBreakOrContinueInfo(this.Labels, breakTarget, continueTarget, labelledOnly: false);
this.Body.GenerateCode(generator, optimizationInfo);
optimizationInfo.PopBreakOrContinueInfo();
generator.Branch(continueTarget);
generator.DefineLabelPosition(breakTarget);
// Generate code for the end of the statement.
GenerateEndOfStatement(generator, optimizationInfo, statementLocals);
}