/// <summary>
/// Pops the value from the top of the stack and stores it in the given local variable.
/// </summary>
/// <param name="variable"> The variable to store the value. </param>
public override void StoreVariable(ILLocalVariable variable)
{
if (variable as ReflectionEmitILLocalVariable == null)
{
throw new ArgumentNullException("variable");
}
this.m_generator.Emit(OpCodes.Stloc, ((ReflectionEmitILLocalVariable)variable).UnderlyingLocal);
}
/// <summary>
/// Outputs an instruction and a variable to the log.
/// </summary>
/// <param name="instruction"> The instruction to output. </param>
/// <param name="variable"> The variable to output. </param>
private void Log(string instruction, ILLocalVariable variable)
{
if (variable.Name == null)
{
LogInstruction(instruction, string.Format("V{0}", variable.Index));
}
else
{
LogInstruction(instruction, string.Format("V{0} ({1})", variable.Index, variable.Name));
}
}
/// <summary>
/// Indicates that the given temporary variable is no longer needed.
/// </summary>
/// <param name="temporaryVariable"> The temporary variable created using CreateTemporaryVariable(). </param>
public void ReleaseTemporaryVariable(ILLocalVariable temporaryVariable)
{
if (temporaryVariable == null)
{
throw new ArgumentNullException("temporaryVariable");
}
if (this.m_temporaryVariables == null)
{
this.m_temporaryVariables = new List <ILLocalVariable>();
}
this.m_temporaryVariables.Add(temporaryVariable);
}
/// <summary> /// Pops the value from the top of the stack and stores it in the given local variable. /// </summary> /// <param name="variable"> The variable to store the value. </param> public abstract void StoreVariable(ILLocalVariable variable);
/// <summary> /// Pushes the address of the given variable onto the stack. /// </summary> /// <param name="variable"> The variable whose address will be pushed. </param> public abstract void LoadAddressOfVariable(ILLocalVariable variable);
/// <summary> /// Pushes the value of the given variable onto the stack. /// </summary> /// <param name="variable"> The variable whose value will be pushed. </param> public abstract void LoadVariable(ILLocalVariable variable);
/// <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)
{
// Check if this is a direct call to eval().
if (this.Target is NameExpression && ((NameExpression)this.Target).Name == "eval")
{
GenerateEval(generator, optimizationInfo);
return;
}
// Emit the function instance first.
ILLocalVariable targetBase = null;
var memberAccessExpressionTarget = this.Target as MemberAccessExpression;
if (memberAccessExpressionTarget != null)
{
// The function is a member access expression (e.g. "Math.cos()").
// Evaluate the left part of the member access expression.
var baseExpression = memberAccessExpressionTarget.Base;
baseExpression.GenerateCode(generator, optimizationInfo);
EmitConversion.ToAny(generator, baseExpression.ResultType);
targetBase = generator.CreateTemporaryVariable(typeof(object));
generator.StoreVariable(targetBase);
// Evaluate the right part of the member access expression.
var memberAccessExpression = new MemberAccessExpression(memberAccessExpressionTarget.Operator);
memberAccessExpression.Push(new TemporaryVariableExpression(targetBase));
memberAccessExpression.Push(memberAccessExpressionTarget.GetOperand(1));
memberAccessExpression.GenerateCode(generator, optimizationInfo);
EmitConversion.ToAny(generator, this.Target.ResultType);
}
else
{
// Something else (e.g. "eval()").
this.Target.GenerateCode(generator, optimizationInfo);
EmitConversion.ToAny(generator, this.Target.ResultType);
}
// Check the object really is a function - if not, throw an exception.
generator.IsInstance(typeof(Library.FunctionInstance));
generator.Duplicate();
var endOfTypeCheck = generator.CreateLabel();
generator.BranchIfNotNull(endOfTypeCheck);
// Throw an nicely formatted exception.
generator.Pop();
EmitHelpers.EmitThrow(generator, "TypeError", string.Format("'{0}' is not a function", this.Target));
generator.DefineLabelPosition(endOfTypeCheck);
// Pass in the path, function name and line.
generator.LoadStringOrNull(optimizationInfo.Source.Path);
generator.LoadStringOrNull(optimizationInfo.FunctionName);
generator.LoadInt32(optimizationInfo.SourceSpan.StartLine);
// Generate code to produce the "this" value. There are three cases.
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.ResultType);
generator.LoadVariable(targetBase);
}
else
{
// 3. Neither of the above (e.g. "(function() { return 5 })()")
// In this case this = undefined.
EmitHelpers.EmitUndefined(generator);
}
// Emit an array containing the function arguments.
GenerateArgumentsArray(generator, optimizationInfo);
// Call FunctionInstance.CallLateBound(thisValue, argumentValues)
generator.Call(ReflectionHelpers.FunctionInstance_CallWithStackTrace.Value);
// Allow reuse of the temporary variable.
if (targetBase != null)
{
generator.ReleaseTemporaryVariable(targetBase);
}
}
public TemporaryVariableExpression(ILLocalVariable variable)
{
this.m_variable = variable;
}
/// <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)
{
// This method generates code to retrieve the value of a variable, given the name of
// variable and scope in which the variable is being referenced. The variable was
// not necessary declared in this scope - it might be declared in any of the parent
// scopes (together called a scope chain). The general algorithm is to start at the
// head of the chain and search backwards until the variable is found. There are
// two types of scopes: declarative scopes and object scopes. Object scopes are hard -
// it cannot be known at compile time whether the variable exists or not so runtime
// checks have to be inserted. Declarative scopes are easier - variables have to be
// declared and cannot be deleted. There is one tricky bit: new variables can be
// introduced into a declarative scope at runtime by a non-strict eval() statement.
// Even worse, variables that were introduced by means of an eval() *can* be deleted.
var scope = this.Scope;
ILLocalVariable scopeVariable = null;
var endOfGet = generator.CreateLabel();
do
{
if (scope is DeclarativeScope)
{
// The variable was declared in this scope.
var variable = scope.GetDeclaredVariable(this.Name);
if (variable != null)
{
if (scope.ExistsAtRuntime == false)
{
// The scope has been optimized away. The value of the variable is stored
// in an ILVariable.
// Declare an IL local variable if no storage location has been allocated yet.
if (variable.Store == null)
{
variable.Store = generator.DeclareVariable(typeof(object), variable.Name);
}
// Load the value from the variable.
generator.LoadVariable(variable.Store);
// Ensure that we match ResultType.
EmitConversion.Convert(generator, variable.Type, this.ResultType, optimizationInfo);
}
else
{
// scope.Values[index]
if (scopeVariable == null)
{
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.CastClass(typeof(DeclarativeScope));
generator.Call(ReflectionHelpers.DeclarativeScope_Values.Value);
generator.LoadInt32(variable.Index);
generator.LoadArrayElement(typeof(object));
}
// The variable was found - no need to search any more parent scopes.
break;
}
// The variable was not defined at compile time, but may have been
// introduced by an eval() statement.
if (optimizationInfo.MethodOptimizationHints.HasEval)
{
// Check the variable exists: if (scope.HasValue(variableName) == true) {
if (scopeVariable == null)
{
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.CastClass(typeof(DeclarativeScope));
generator.LoadString(this.Name);
generator.Call(ReflectionHelpers.Scope_HasValue.Value);
var hasValueClause = generator.CreateLabel();
generator.BranchIfFalse(hasValueClause);
// Load the value of the variable.
if (scopeVariable == null)
{
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.CastClass(typeof(DeclarativeScope));
generator.LoadString(this.Name);
generator.Call(ReflectionHelpers.Scope_GetValue.Value);
generator.Branch(endOfGet);
// }
generator.DefineLabelPosition(hasValueClause);
}
}
else
{
if (scope.ParentScope == null)
{
// Global variable access
// -------------------------------------------
// __object_cacheKey = null;
// __object_property_cachedIndex = 0;
// ...
// if (__object_cacheKey != object.InlineCacheKey)
// xxx = object.InlineGetPropertyValue("variable", out __object_property_cachedIndex, out __object_cacheKey)
// else
// xxx = object.InlinePropertyValues[__object_property_cachedIndex];
// Get a reference to the global object.
if (scopeVariable == null)
{
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.CastClass(typeof(ObjectScope));
generator.Call(ReflectionHelpers.ObjectScope_ScopeObject.Value);
// TODO: share these variables somehow.
var cacheKey = generator.DeclareVariable(typeof(object), null);
var cachedIndex = generator.DeclareVariable(typeof(int), null);
// Store the object into a temp variable.
var objectInstance = generator.DeclareVariable(PrimitiveType.Object, null);
generator.StoreVariable(objectInstance);
// if (__object_cacheKey != object.InlineCacheKey)
generator.LoadVariable(cacheKey);
generator.LoadVariable(objectInstance);
generator.Call(ReflectionHelpers.ObjectInstance_InlineCacheKey.Value);
var elseClause = generator.CreateLabel();
generator.BranchIfEqual(elseClause);
// value = object.InlineGetProperty("property", out __object_property_cachedIndex, out __object_cacheKey)
generator.LoadVariable(objectInstance);
generator.LoadString(this.Name);
generator.LoadAddressOfVariable(cachedIndex);
generator.LoadAddressOfVariable(cacheKey);
generator.Call(ReflectionHelpers.ObjectInstance_InlineGetPropertyValue.Value);
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.Value);
generator.LoadVariable(cachedIndex);
generator.LoadArrayElement(typeof(object));
// End of the if statement
generator.DefineLabelPosition(endOfIf);
// Check if the value is null.
generator.Duplicate();
generator.BranchIfNotNull(endOfGet);
if (scope.ParentScope != null)
{
generator.Pop();
}
}
else
{
// Gets the value of a variable in an object scope.
if (scopeVariable == null)
{
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.CastClass(typeof(ObjectScope));
generator.Call(ReflectionHelpers.ObjectScope_ScopeObject.Value);
generator.LoadString(this.Name);
generator.Call(ReflectionHelpers.ObjectInstance_GetPropertyValue_String.Value);
// Check if the value is null.
generator.Duplicate();
generator.BranchIfNotNull(endOfGet);
if (scope.ParentScope != null)
{
generator.Pop();
}
}
}
// Try the parent scope.
if (scope.ParentScope != null && scope.ExistsAtRuntime)
{
if (scopeVariable == null)
{
scopeVariable = generator.CreateTemporaryVariable(typeof(Scope));
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.Call(ReflectionHelpers.Scope_ParentScope.Value);
generator.StoreVariable(scopeVariable);
}
scope = scope.ParentScope;
} while (scope != null);
// Throw an error if the name does not exist and throwIfUnresolvable is true.
if (scope == null && throwIfUnresolvable)
{
EmitHelpers.EmitThrow(generator, "ReferenceError", this.Name + " is not defined", optimizationInfo);
}
// Release the temporary variable.
if (scopeVariable != null)
{
generator.ReleaseTemporaryVariable(scopeVariable);
}
// Define a label at the end.
generator.DefineLabelPosition(endOfGet);
// Object scope references may have side-effects (because of getters) so if the value
// is to be ignored we evaluate the value then pop the value from the stack.
//if (optimizationInfo.SuppressReturnValue == true)
// generator.Pop();
}
/// <summary>
/// Generates code to push the "this" value for a function call.
/// </summary>
/// <param name="generator"> The generator to output the CIL to. </param>
public void GenerateThis(ILGenerator generator)
{
// Optimization: if there are no with scopes, simply emit undefined.
bool scopeChainHasWithScope = false;
var scope = this.Scope;
do
{
if (scope is ObjectScope && ((ObjectScope)scope).ProvidesImplicitThisValue)
{
scopeChainHasWithScope = true;
break;
}
scope = scope.ParentScope;
} while (scope != null);
if (scopeChainHasWithScope == false)
{
// No with scopes in the scope chain, use undefined as the "this" value.
EmitHelpers.EmitUndefined(generator);
return;
}
var end = generator.CreateLabel();
scope = this.Scope;
ILLocalVariable scopeVariable = generator.CreateTemporaryVariable(typeof(Scope));
EmitHelpers.LoadScope(generator);
generator.StoreVariable(scopeVariable);
do
{
if (scope is DeclarativeScope)
{
if (scope.HasDeclaredVariable(this.Name))
{
// The variable exists but declarative scopes always produce undefined for
// the "this" value.
EmitHelpers.EmitUndefined(generator);
break;
}
}
else
{
var objectScope = (ObjectScope)scope;
// Check if the property exists by calling scope.ScopeObject.HasProperty(propertyName)
if (objectScope.ProvidesImplicitThisValue == false)
{
EmitHelpers.EmitUndefined(generator);
}
generator.LoadVariable(scopeVariable);
generator.CastClass(typeof(ObjectScope));
generator.Call(ReflectionHelpers.ObjectScope_ScopeObject.Value);
if (objectScope.ProvidesImplicitThisValue)
{
generator.Duplicate();
}
generator.LoadString(this.Name);
generator.Call(ReflectionHelpers.ObjectInstance_HasProperty.Value);
generator.BranchIfTrue(end);
generator.Pop();
// If the name is not defined, use undefined for the "this" value.
if (scope.ParentScope == null)
{
EmitHelpers.EmitUndefined(generator);
}
}
// Try the parent scope.
if (scope.ParentScope != null && scope.ExistsAtRuntime)
{
generator.LoadVariable(scopeVariable);
generator.Call(ReflectionHelpers.Scope_ParentScope.Value);
generator.StoreVariable(scopeVariable);
}
scope = scope.ParentScope;
} while (scope != null);
// Release the temporary variable.
generator.ReleaseTemporaryVariable(scopeVariable);
// Define a label at the end.
generator.DefineLabelPosition(end);
}
/// <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)
{
// Deleting a variable is not allowed in strict mode.
if (optimizationInfo.StrictMode)
{
throw new JavaScriptException(optimizationInfo.Engine, "SyntaxError", string.Format("Cannot delete {0} because deleting a variable or argument is not allowed in strict mode", this.Name), optimizationInfo.SourceSpan.StartLine, optimizationInfo.Source.Path, optimizationInfo.FunctionName);
}
var endOfDelete = generator.CreateLabel();
var scope = this.Scope;
ILLocalVariable scopeVariable = generator.CreateTemporaryVariable(typeof(Scope));
EmitHelpers.LoadScope(generator);
generator.StoreVariable(scopeVariable);
do
{
if (scope is DeclarativeScope)
{
var variable = scope.GetDeclaredVariable(this.Name);
if (variable != null)
{
// The variable is known at compile-time.
if (variable.Deletable == false)
{
// The variable cannot be deleted - return false.
generator.LoadBoolean(false);
}
else
{
// The variable can be deleted (it was declared inside an eval()).
// Delete the variable.
generator.LoadVariable(scopeVariable);
generator.CastClass(typeof(DeclarativeScope));
generator.LoadString(this.Name);
generator.Call(ReflectionHelpers.Scope_Delete.Value);
}
break;
}
// The variable was not defined at compile time, but may have been
// introduced by an eval() statement.
if (optimizationInfo.MethodOptimizationHints.HasEval)
{
// Check the variable exists: if (scope.HasValue(variableName) == true) {
generator.LoadVariable(scopeVariable);
generator.CastClass(typeof(DeclarativeScope));
generator.LoadString(this.Name);
generator.Call(ReflectionHelpers.Scope_HasValue.Value);
var hasValueClause = generator.CreateLabel();
generator.BranchIfFalse(hasValueClause);
// If the variable does exist, return true.
generator.LoadVariable(scopeVariable);
generator.CastClass(typeof(DeclarativeScope));
generator.LoadString(this.Name);
generator.Call(ReflectionHelpers.Scope_Delete.Value);
generator.Branch(endOfDelete);
// }
generator.DefineLabelPosition(hasValueClause);
}
}
else
{
// Check if the property exists by calling scope.ScopeObject.HasProperty(propertyName)
generator.LoadVariable(scopeVariable);
generator.CastClass(typeof(ObjectScope));
generator.Call(ReflectionHelpers.ObjectScope_ScopeObject.Value);
generator.Duplicate();
generator.LoadString(this.Name);
generator.Call(ReflectionHelpers.ObjectInstance_HasProperty.Value);
// Jump past the delete if the property doesn't exist.
var endOfExistsCheck = generator.CreateLabel();
generator.BranchIfFalse(endOfExistsCheck);
// Call scope.ScopeObject.Delete(propertyName, false)
generator.LoadString(this.Name);
generator.LoadBoolean(false);
generator.Call(ReflectionHelpers.ObjectInstance_Delete.Value);
generator.Branch(endOfDelete);
generator.DefineLabelPosition(endOfExistsCheck);
generator.Pop();
// If the name is not defined, return true.
if (scope.ParentScope == null)
{
generator.LoadBoolean(true);
}
}
// Try the parent scope.
if (scope.ParentScope != null && scope.ExistsAtRuntime)
{
generator.LoadVariable(scopeVariable);
generator.Call(ReflectionHelpers.Scope_ParentScope.Value);
generator.StoreVariable(scopeVariable);
}
scope = scope.ParentScope;
} while (scope != null);
// Release the temporary variable.
generator.ReleaseTemporaryVariable(scopeVariable);
// Define a label at the end.
generator.DefineLabelPosition(endOfDelete);
// Delete obviously has side-effects so we evaluate the return value then pop it from
// the stack.
//if (optimizationInfo.SuppressReturnValue == true)
// generator.Pop();
}
/// <summary>
/// Stores the value on the top of the stack in the 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>
/// <param name="valueType"> The primitive type of the value that is on the top of the stack. </param>
/// <param name="throwIfUnresolvable"> <c>true</c> to throw a ReferenceError exception if
/// the name is unresolvable; <c>false</c> to create a new property instead. </param>
public void GenerateSet(ILGenerator generator, OptimizationInfo optimizationInfo, PrimitiveType valueType, bool throwIfUnresolvable)
{
// The value is initially on the top of the stack but is stored in this variable
// at the last possible moment.
ILLocalVariable value = null;
var scope = this.Scope;
ILLocalVariable scopeVariable = null;
var endOfSet = generator.CreateLabel();
do
{
if (scope is DeclarativeScope)
{
// Get information about the variable.
var variable = scope.GetDeclaredVariable(this.Name);
if (variable != null)
{
// The variable was declared in this scope.
if (scope.ExistsAtRuntime == false)
{
// The scope has been optimized away. The value of the variable is stored
// in an ILVariable.
// Declare an IL local variable if no storage location has been allocated yet.
if (variable.Store == null)
{
variable.Store = generator.DeclareVariable(typeof(object), variable.Name);
}
if (value == null)
{
// The value to store is on the top of the stack - convert it to the
// storage type of the variable.
EmitConversion.Convert(generator, valueType, variable.Type, optimizationInfo);
}
else
{
// The value to store is in a temporary variable.
generator.LoadVariable(value);
EmitConversion.Convert(generator, PrimitiveType.Any, variable.Type, optimizationInfo);
}
// Store the value in the variable.
generator.StoreVariable(variable.Store);
}
else if (variable.Writable)
{
if (value == null)
{
// The value to store is on the top of the stack - convert it to an
// object and store it in a temporary variable.
EmitConversion.Convert(generator, valueType, PrimitiveType.Any, optimizationInfo);
value = generator.CreateTemporaryVariable(typeof(object));
generator.StoreVariable(value);
}
// scope.Values[index] = value
if (scopeVariable == null)
{
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.CastClass(typeof(DeclarativeScope));
generator.Call(ReflectionHelpers.DeclarativeScope_Values.Value);
generator.LoadInt32(variable.Index);
generator.LoadVariable(value);
generator.StoreArrayElement(typeof(object));
}
else
{
// The variable exists, but is read-only.
// Pop the value off the stack (if it is still there).
if (value == null)
{
generator.Pop();
}
}
// The variable was found - no need to search any more parent scopes.
break;
}
// The variable was not defined at compile time, but may have been
// introduced by an eval() statement.
if (optimizationInfo.MethodOptimizationHints.HasEval)
{
if (value == null)
{
// The value to store is on the top of the stack - convert it to an
// object and store it in a temporary variable.
EmitConversion.Convert(generator, valueType, PrimitiveType.Any, optimizationInfo);
value = generator.CreateTemporaryVariable(typeof(object));
generator.StoreVariable(value);
}
// Check the variable exists: if (scope.HasValue(variableName) == true) {
if (scopeVariable == null)
{
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.CastClass(typeof(DeclarativeScope));
generator.LoadString(this.Name);
generator.Call(ReflectionHelpers.Scope_HasValue.Value);
var hasValueClause = generator.CreateLabel();
generator.BranchIfFalse(hasValueClause);
// Set the value of the variable.
if (scopeVariable == null)
{
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.CastClass(typeof(DeclarativeScope));
generator.LoadString(this.Name);
generator.LoadVariable(value);
generator.Call(ReflectionHelpers.Scope_SetValue.Value);
generator.Branch(endOfSet);
// }
generator.DefineLabelPosition(hasValueClause);
}
}
else
{
if (value == null)
{
// The value to store is on the top of the stack - convert it to an
// object and store it in a temporary variable.
EmitConversion.Convert(generator, valueType, PrimitiveType.Any, optimizationInfo);
value = generator.CreateTemporaryVariable(typeof(object));
generator.StoreVariable(value);
}
if (scope.ParentScope == null)
{
// Optimization: if this is the global scope, use hidden classes to
// optimize variable access.
// Global variable modification
// ----------------------------
// __object_cacheKey = null;
// __object_property_cachedIndex = 0;
// ...
// if (__object_cacheKey != object.InlineCacheKey)
// object.InlineSetPropertyValueIfExists("property", value, strictMode, out __object_property_cachedIndex, out __object_cacheKey)
// else
// object.InlinePropertyValues[__object_property_cachedIndex] = value;
// Get a reference to the global object.
if (scopeVariable == null)
{
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.CastClass(typeof(ObjectScope));
generator.Call(ReflectionHelpers.ObjectScope_ScopeObject.Value);
// TODO: share these variables somehow.
var cacheKey = generator.DeclareVariable(typeof(object), null);
var cachedIndex = generator.DeclareVariable(typeof(int), null);
// Store the object into a temp variable.
var objectInstance = generator.DeclareVariable(PrimitiveType.Object, null);
generator.StoreVariable(objectInstance);
// if (__object_cacheKey != object.InlineCacheKey)
generator.LoadVariable(cacheKey);
generator.LoadVariable(objectInstance);
generator.Call(ReflectionHelpers.ObjectInstance_InlineCacheKey.Value);
var elseClause = generator.CreateLabel();
generator.BranchIfEqual(elseClause);
// xxx = object.InlineSetPropertyValueIfExists("property", value, strictMode, out __object_property_cachedIndex, out __object_cacheKey)
generator.LoadVariable(objectInstance);
generator.LoadString(this.Name);
generator.LoadVariable(value);
generator.LoadBoolean(optimizationInfo.StrictMode);
generator.LoadAddressOfVariable(cachedIndex);
generator.LoadAddressOfVariable(cacheKey);
if (throwIfUnresolvable == false)
{
// Set the property value unconditionally.
generator.Call(ReflectionHelpers.ObjectInstance_InlineSetPropertyValue.Value);
}
else
{
// Set the property value if the property exists.
generator.Call(ReflectionHelpers.ObjectInstance_InlineSetPropertyValueIfExists.Value);
// The return value is true if the property was defined, and false if it wasn't.
generator.BranchIfTrue(endOfSet);
}
var endOfIf = generator.CreateLabel();
generator.Branch(endOfIf);
// else
generator.DefineLabelPosition(elseClause);
// object.InlinePropertyValues[__object_property_cachedIndex] = value;
generator.LoadVariable(objectInstance);
generator.Call(ReflectionHelpers.ObjectInstance_InlinePropertyValues.Value);
generator.LoadVariable(cachedIndex);
generator.LoadVariable(value);
generator.StoreArrayElement(typeof(object));
generator.Branch(endOfSet);
// End of the if statement
generator.DefineLabelPosition(endOfIf);
}
else
{
// Slow route.
if (scopeVariable == null)
{
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.CastClass(typeof(ObjectScope));
generator.Call(ReflectionHelpers.ObjectScope_ScopeObject.Value);
generator.LoadString(this.Name);
generator.LoadVariable(value);
generator.LoadBoolean(optimizationInfo.StrictMode);
if (scope.ParentScope == null && throwIfUnresolvable == false)
{
// Set the property value unconditionally.
generator.Call(ReflectionHelpers.ObjectInstance_SetPropertyValue_String.Value);
}
else
{
// Set the property value if the property exists.
generator.Call(ReflectionHelpers.ObjectInstance_SetPropertyValueIfExists.Value);
// The return value is true if the property was defined, and false if it wasn't.
generator.BranchIfTrue(endOfSet);
}
}
}
// Try the parent scope.
if (scope.ParentScope != null && scope.ExistsAtRuntime)
{
if (scopeVariable == null)
{
scopeVariable = generator.CreateTemporaryVariable(typeof(Scope));
EmitHelpers.LoadScope(generator);
}
else
{
generator.LoadVariable(scopeVariable);
}
generator.Call(ReflectionHelpers.Scope_ParentScope.Value);
generator.StoreVariable(scopeVariable);
}
scope = scope.ParentScope;
} while (scope != null);
// The value might be still on top of the stack.
if (value == null && scope == null)
{
generator.Pop();
}
// Throw an error if the name does not exist and throwIfUnresolvable is true.
if (scope == null && throwIfUnresolvable)
{
EmitHelpers.EmitThrow(generator, "ReferenceError", this.Name + " is not defined", optimizationInfo);
}
// Release the temporary variables.
if (value != null)
{
generator.ReleaseTemporaryVariable(value);
}
if (scopeVariable != null)
{
generator.ReleaseTemporaryVariable(scopeVariable);
}
// Define a label at the end.
generator.DefineLabelPosition(endOfSet);
}
/// <summary>
/// Pops the value from the top of the stack and stores it in the given local variable.
/// </summary>
/// <param name="variable"> The variable to store the value. </param>
public override void StoreVariable(ILLocalVariable variable)
{
Log("stloc", variable);
this.m_generator.StoreVariable(variable);
}
/// <summary>
/// Pushes the address of the given variable onto the stack.
/// </summary>
/// <param name="variable"> The variable whose address will be pushed. </param>
public override void LoadAddressOfVariable(ILLocalVariable variable)
{
Log("ldloca", variable);
this.m_generator.LoadAddressOfVariable(variable);
}
