Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Compiler / StackSpiller.Bindings.cs / 1305376 / StackSpiller.Bindings.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.Collections.ObjectModel; using System.Dynamic.Utils; using System.Runtime.CompilerServices; #if SILVERLIGHT using System.Core; #endif namespace System.Linq.Expressions.Compiler { internal partial class StackSpiller { private abstract class BindingRewriter { protected MemberBinding _binding; protected RewriteAction _action; protected StackSpiller _spiller; internal BindingRewriter(MemberBinding binding, StackSpiller spiller) { _binding = binding; _spiller = spiller; } internal RewriteAction Action { get { return _action; } } internal abstract MemberBinding AsBinding(); internal abstract Expression AsExpression(Expression target); internal static BindingRewriter Create(MemberBinding binding, StackSpiller spiller, Stack stack) { switch (binding.BindingType) { case MemberBindingType.Assignment: MemberAssignment assign = (MemberAssignment)binding; return new MemberAssignmentRewriter(assign, spiller, stack); case MemberBindingType.ListBinding: MemberListBinding list = (MemberListBinding)binding; return new ListBindingRewriter(list, spiller, stack); case MemberBindingType.MemberBinding: MemberMemberBinding member = (MemberMemberBinding)binding; return new MemberMemberBindingRewriter(member, spiller, stack); } throw Error.UnhandledBinding(); } } private class MemberMemberBindingRewriter : BindingRewriter { ReadOnlyCollection_bindings; BindingRewriter[] _bindingRewriters; internal MemberMemberBindingRewriter(MemberMemberBinding binding, StackSpiller spiller, Stack stack) : base(binding, spiller) { _bindings = binding.Bindings; _bindingRewriters = new BindingRewriter[_bindings.Count]; for (int i = 0; i < _bindings.Count; i++) { BindingRewriter br = BindingRewriter.Create(_bindings[i], spiller, stack); _action |= br.Action; _bindingRewriters[i] = br; } } internal override MemberBinding AsBinding() { switch (_action) { case RewriteAction.None: return _binding; case RewriteAction.Copy: MemberBinding[] newBindings = new MemberBinding[_bindings.Count]; for (int i = 0; i < _bindings.Count; i++) { newBindings[i] = _bindingRewriters[i].AsBinding(); } return Expression.MemberBind(_binding.Member, new TrueReadOnlyCollection (newBindings)); } throw ContractUtils.Unreachable; } internal override Expression AsExpression(Expression target) { if (target.Type.IsValueType && _binding.Member is System.Reflection.PropertyInfo) { throw Error.CannotAutoInitializeValueTypeMemberThroughProperty(_binding.Member); } RequireNotRefInstance(target); MemberExpression member = Expression.MakeMemberAccess(target, _binding.Member); ParameterExpression memberTemp = _spiller.MakeTemp(member.Type); Expression[] block = new Expression[_bindings.Count + 2]; block[0] = Expression.Assign(memberTemp, member); for (int i = 0; i < _bindings.Count; i++) { BindingRewriter br = _bindingRewriters[i]; block[i + 1] = br.AsExpression(memberTemp); } // We need to copy back value types if (memberTemp.Type.IsValueType) { block[_bindings.Count + 1] = Expression.Block( typeof(void), Expression.Assign(Expression.MakeMemberAccess(target, _binding.Member), memberTemp) ); } else { block[_bindings.Count + 1] = Expression.Empty(); } return MakeBlock(block); } } private class ListBindingRewriter : BindingRewriter { ReadOnlyCollection _inits; ChildRewriter[] _childRewriters; internal ListBindingRewriter(MemberListBinding binding, StackSpiller spiller, Stack stack) : base(binding, spiller) { _inits = binding.Initializers; _childRewriters = new ChildRewriter[_inits.Count]; for (int i = 0; i < _inits.Count; i++) { ElementInit init = _inits[i]; ChildRewriter cr = new ChildRewriter(spiller, stack, init.Arguments.Count); cr.Add(init.Arguments); _action |= cr.Action; _childRewriters[i] = cr; } } internal override MemberBinding AsBinding() { switch (_action) { case RewriteAction.None: return _binding; case RewriteAction.Copy: ElementInit[] newInits = new ElementInit[_inits.Count]; for (int i = 0; i < _inits.Count; i++) { ChildRewriter cr = _childRewriters[i]; if (cr.Action == RewriteAction.None) { newInits[i] = _inits[i]; } else { newInits[i] = Expression.ElementInit(_inits[i].AddMethod, cr[0, -1]); } } return Expression.ListBind(_binding.Member, new TrueReadOnlyCollection (newInits)); } throw ContractUtils.Unreachable; } internal override Expression AsExpression(Expression target) { if (target.Type.IsValueType && _binding.Member is System.Reflection.PropertyInfo) { throw Error.CannotAutoInitializeValueTypeElementThroughProperty(_binding.Member); } RequireNotRefInstance(target); MemberExpression member = Expression.MakeMemberAccess(target, _binding.Member); ParameterExpression memberTemp = _spiller.MakeTemp(member.Type); Expression[] block = new Expression[_inits.Count + 2]; block[0] = Expression.Assign(memberTemp, member); for (int i = 0; i < _inits.Count; i++) { ChildRewriter cr = _childRewriters[i]; Result add = cr.Finish(Expression.Call(memberTemp, _inits[i].AddMethod, cr[0, -1])); block[i + 1] = add.Node; } // We need to copy back value types if (memberTemp.Type.IsValueType) { block[_inits.Count + 1] = Expression.Block( typeof(void), Expression.Assign(Expression.MakeMemberAccess(target, _binding.Member), memberTemp) ); } else { block[_inits.Count + 1] = Expression.Empty(); } return MakeBlock(block); } } private class MemberAssignmentRewriter : BindingRewriter { Expression _rhs; internal MemberAssignmentRewriter(MemberAssignment binding, StackSpiller spiller, Stack stack) : base(binding, spiller) { Result result = spiller.RewriteExpression(binding.Expression, stack); _action = result.Action; _rhs = result.Node; } internal override MemberBinding AsBinding() { switch (_action) { case RewriteAction.None: return _binding; case RewriteAction.Copy: return Expression.Bind(_binding.Member, _rhs); } throw ContractUtils.Unreachable; } internal override Expression AsExpression(Expression target) { RequireNotRefInstance(target); MemberExpression member = Expression.MakeMemberAccess(target, _binding.Member); ParameterExpression memberTemp = _spiller.MakeTemp(member.Type); return MakeBlock( Expression.Assign(memberTemp, _rhs), Expression.Assign(member, memberTemp), Expression.Empty() ); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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