Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Compiler / RuntimeVariableList.cs / 1305376 / RuntimeVariableList.cs
/* **************************************************************************** * * Copyright (c) Microsoft Corporation. * * This source code is subject to terms and conditions of the Microsoft Public License. A * copy of the license can be found in the License.html file at the root of this distribution. If * you cannot locate the Microsoft Public License, please send an email to * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound * by the terms of the Microsoft Public License. * * You must not remove this notice, or any other, from this software. * * * ***************************************************************************/ using System.ComponentModel; using System.Diagnostics; using System.Linq.Expressions.Compiler; namespace System.Runtime.CompilerServices { ////// This API supports the .NET Framework infrastructure and is not intended to be used directly from your code. /// Contains helper methods called from dynamically generated methods. /// [EditorBrowsable(EditorBrowsableState.Never), DebuggerStepThrough] public static partial class RuntimeOps { ////// Creates an interface that can be used to modify closed over variables at runtime. /// /// The closure array. /// An array of indicies into the closure array where variables are found. ///An interface to access variables. [Obsolete("do not use this method", true), EditorBrowsable(EditorBrowsableState.Never)] public static IRuntimeVariables CreateRuntimeVariables(object[] data, long[] indexes) { return new RuntimeVariableList(data, indexes); } ////// Creates an interface that can be used to modify closed over variables at runtime. /// ///An interface to access variables. [Obsolete("do not use this method", true), EditorBrowsable(EditorBrowsableState.Never)] public static IRuntimeVariables CreateRuntimeVariables() { return new EmptyRuntimeVariables(); } private sealed class EmptyRuntimeVariables : IRuntimeVariables { int IRuntimeVariables.Count { get { return 0; } } object IRuntimeVariables.this[int index] { get { throw new ArgumentOutOfRangeException("index"); } set { throw new ArgumentOutOfRangeException("index"); } } } ////// Provides a list of variables, supporing read/write of the values /// Exposed via RuntimeVariablesExpression /// private sealed class RuntimeVariableList : IRuntimeVariables { // The top level environment. It contains pointers to parent // environments, which are always in the first element private readonly object[] _data; // An array of (int, int) pairs, each representing how to find a // variable in the environment data struction. // // The first integer indicates the number of times to go up in the // closure chain, the second integer indicates the index into that // closure chain. private readonly long[] _indexes; internal RuntimeVariableList(object[] data, long[] indexes) { Debug.Assert(data != null); Debug.Assert(indexes != null); _data = data; _indexes = indexes; } public int Count { get { return _indexes.Length; } } public object this[int index] { get { return GetStrongBox(index).Value; } set { GetStrongBox(index).Value = value; } } private IStrongBox GetStrongBox(int index) { // We lookup the closure using two ints: // 1. The high dword is the number of parents to go up // 2. The low dword is the index into that array long closureKey = _indexes[index]; // walk up the parent chain to find the real environment object[] result = _data; for (int parents = (int)(closureKey >> 32); parents > 0; parents--) { result = HoistedLocals.GetParent(result); } // Return the variable storage return (IStrongBox)result[(int)closureKey]; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DropDownButton.cs
- AutomationElementIdentifiers.cs
- MultipleViewPattern.cs
- FlowPosition.cs
- ColumnResult.cs
- TabControlDesigner.cs
- Matrix.cs
- Collection.cs
- AttributeProviderAttribute.cs
- ObjectContext.cs
- AuthenticationModulesSection.cs
- SpellerError.cs
- Binding.cs
- _ReceiveMessageOverlappedAsyncResult.cs
- XmlSchemaDatatype.cs
- FileChangesMonitor.cs
- MultiBindingExpression.cs
- SettingsSection.cs
- ListenerPerfCounters.cs
- CopyOnWriteList.cs
- followingsibling.cs
- XPathNode.cs
- Transactions.cs
- ImageButton.cs
- RedirectionProxy.cs
- FlowDocumentView.cs
- SamlAssertion.cs
- WindowsAuthenticationModule.cs
- XmlSchemas.cs
- SymmetricCryptoHandle.cs
- HttpCachePolicy.cs
- ObjectListField.cs
- Win32.cs
- CustomTypeDescriptor.cs
- SessionStateModule.cs
- DataColumn.cs
- XhtmlBasicPageAdapter.cs
- ScriptHandlerFactory.cs
- CalendarDateChangedEventArgs.cs
- ViewManager.cs
- TransformCryptoHandle.cs
- XmlText.cs
- DataServiceQueryOfT.cs
- LineSegment.cs
- CurrentChangingEventArgs.cs
- Win32SafeHandles.cs
- DataRelation.cs
- xamlnodes.cs
- PointKeyFrameCollection.cs
- MarshalByValueComponent.cs
- XmlnsCache.cs
- ToolStripScrollButton.cs
- ProcessHostServerConfig.cs
- DependencyPropertyAttribute.cs
- PolicyManager.cs
- FixedSOMLineCollection.cs
- DataGridViewColumnStateChangedEventArgs.cs
- InvalidProgramException.cs
- TableItemStyle.cs
- SHA1.cs
- Rfc2898DeriveBytes.cs
- DropShadowEffect.cs
- DragEvent.cs
- PolyLineSegment.cs
- SiteMembershipCondition.cs
- DiffuseMaterial.cs
- DataGridViewCellFormattingEventArgs.cs
- InstallerTypeAttribute.cs
- CursorConverter.cs
- RevocationPoint.cs
- AuthorizationRuleCollection.cs
- NumberSubstitution.cs
- EntryWrittenEventArgs.cs
- RemotingConfiguration.cs
- ExpressionLexer.cs
- StyleXamlParser.cs
- ReceiveMessageContent.cs
- SqlErrorCollection.cs
- BitmapEffect.cs
- RowToParametersTransformer.cs
- EnumMember.cs
- _DomainName.cs
- SymbolPair.cs
- DeviceFiltersSection.cs
- PresentationSource.cs
- QilName.cs
- CryptoApi.cs
- VectorAnimationUsingKeyFrames.cs
- GridViewColumnCollectionChangedEventArgs.cs
- SapiRecoInterop.cs
- CodeDomSerializationProvider.cs
- StatusBarPanelClickEvent.cs
- FontResourceCache.cs
- InternalResources.cs
- ProcessInfo.cs
- ProxySimple.cs
- ContainerUIElement3D.cs
- SpellerHighlightLayer.cs
- ipaddressinformationcollection.cs
- DocumentScope.cs