Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Compiler / CompilerScope.Storage.cs / 1305376 / CompilerScope.Storage.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.Reflection; using System.Reflection.Emit; using System.Runtime.CompilerServices; namespace System.Linq.Expressions.Compiler { internal sealed partial class CompilerScope { private abstract class Storage { internal readonly LambdaCompiler Compiler; internal readonly ParameterExpression Variable; internal Storage(LambdaCompiler compiler, ParameterExpression variable) { Compiler = compiler; Variable = variable; } internal abstract void EmitLoad(); internal abstract void EmitAddress(); internal abstract void EmitStore(); internal virtual void EmitStore(Storage value) { value.EmitLoad(); EmitStore(); } internal virtual void FreeLocal() { } } private sealed class LocalStorage : Storage { private readonly LocalBuilder _local; internal LocalStorage(LambdaCompiler compiler, ParameterExpression variable) : base(compiler, variable) { // ByRef variables are supported. This is used internally by // the compiler when emitting an inlined lambda invoke, to // handle ByRef parameters. BlockExpression prevents this // from being exposed to user created trees. _local = compiler.GetNamedLocal(variable.IsByRef ? variable.Type.MakeByRefType() : variable.Type, variable); } internal override void EmitLoad() { Compiler.IL.Emit(OpCodes.Ldloc, _local); } internal override void EmitStore() { Compiler.IL.Emit(OpCodes.Stloc, _local); } internal override void EmitAddress() { Compiler.IL.Emit(OpCodes.Ldloca, _local); } } private sealed class ArgumentStorage : Storage { private readonly int _argument; internal ArgumentStorage(LambdaCompiler compiler, ParameterExpression p) : base(compiler, p) { _argument = compiler.GetLambdaArgument(compiler.Parameters.IndexOf(p)); } internal override void EmitLoad() { Compiler.IL.EmitLoadArg(_argument); } internal override void EmitStore() { Compiler.IL.EmitStoreArg(_argument); } internal override void EmitAddress() { Compiler.IL.EmitLoadArgAddress(_argument); } } private sealed class ElementBoxStorage : Storage { private readonly int _index; private readonly Storage _array; private readonly Type _boxType; private readonly FieldInfo _boxValueField; internal ElementBoxStorage(Storage array, int index, ParameterExpression variable) : base(array.Compiler, variable) { _array = array; _index = index; _boxType = typeof(StrongBox<>).MakeGenericType(variable.Type); _boxValueField = _boxType.GetField("Value"); } internal override void EmitLoad() { EmitLoadBox(); Compiler.IL.Emit(OpCodes.Ldfld, _boxValueField); } internal override void EmitStore() { LocalBuilder value = Compiler.GetLocal(Variable.Type); Compiler.IL.Emit(OpCodes.Stloc, value); EmitLoadBox(); Compiler.IL.Emit(OpCodes.Ldloc, value); Compiler.FreeLocal(value); Compiler.IL.Emit(OpCodes.Stfld, _boxValueField); } internal override void EmitStore(Storage value) { EmitLoadBox(); value.EmitLoad(); Compiler.IL.Emit(OpCodes.Stfld, _boxValueField); } internal override void EmitAddress() { EmitLoadBox(); Compiler.IL.Emit(OpCodes.Ldflda, _boxValueField); } internal void EmitLoadBox() { _array.EmitLoad(); Compiler.IL.EmitInt(_index); Compiler.IL.Emit(OpCodes.Ldelem_Ref); Compiler.IL.Emit(OpCodes.Castclass, _boxType); } } private sealed class LocalBoxStorage : Storage { private readonly LocalBuilder _boxLocal; private readonly Type _boxType; private readonly FieldInfo _boxValueField; internal LocalBoxStorage(LambdaCompiler compiler, ParameterExpression variable) : base(compiler, variable) { _boxType = typeof(StrongBox<>).MakeGenericType(variable.Type); _boxValueField = _boxType.GetField("Value"); _boxLocal = compiler.GetNamedLocal(_boxType, variable); } internal override void EmitLoad() { Compiler.IL.Emit(OpCodes.Ldloc, _boxLocal); Compiler.IL.Emit(OpCodes.Ldfld, _boxValueField); } internal override void EmitAddress() { Compiler.IL.Emit(OpCodes.Ldloc, _boxLocal); Compiler.IL.Emit(OpCodes.Ldflda, _boxValueField); } internal override void EmitStore() { LocalBuilder value = Compiler.GetLocal(Variable.Type); Compiler.IL.Emit(OpCodes.Stloc, value); Compiler.IL.Emit(OpCodes.Ldloc, _boxLocal); Compiler.IL.Emit(OpCodes.Ldloc, value); Compiler.FreeLocal(value); Compiler.IL.Emit(OpCodes.Stfld, _boxValueField); } internal override void EmitStore(Storage value) { Compiler.IL.Emit(OpCodes.Ldloc, _boxLocal); value.EmitLoad(); Compiler.IL.Emit(OpCodes.Stfld, _boxValueField); } internal void EmitStoreBox() { Compiler.IL.Emit(OpCodes.Stloc, _boxLocal); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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