mirror of https://github.com/icsharpcode/ILSpy.git
Daniel Grunwald
8 years ago
16 changed files with 922 additions and 131 deletions
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// Copyright (c) 2017 Daniel Grunwald
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System; |
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using System.Collections.Generic; |
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using System.Diagnostics; |
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using System.Linq; |
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using System.Text; |
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using ICSharpCode.Decompiler.TypeSystem; |
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namespace ICSharpCode.Decompiler.IL.Transforms |
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{ |
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class EarlyExpressionTransforms : ILVisitor, IILTransform |
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{ |
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ILTransformContext context; |
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public void Run(ILFunction function, ILTransformContext context) |
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{ |
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this.context = context; |
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Default(function); |
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} |
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protected override void Default(ILInstruction inst) |
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{ |
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foreach (var child in inst.Children) { |
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child.AcceptVisitor(this); |
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} |
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} |
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protected internal override void VisitStObj(StObj inst) |
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{ |
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base.VisitStObj(inst); |
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StObjToStLoc(inst, context); |
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} |
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// This transform is required because ILInlining only works with stloc/ldloc
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internal static bool StObjToStLoc(StObj inst, ILTransformContext context) |
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{ |
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if (inst.Target.MatchLdLoca(out ILVariable v) |
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&& TypeUtils.IsCompatibleTypeForMemoryAccess(new ByReferenceType(v.Type), inst.Type) |
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&& inst.UnalignedPrefix == 0 |
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&& !inst.IsVolatile) { |
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context.Step($"stobj(ldloca {v.Name}, ...) => stloc {v.Name}(...)", inst); |
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inst.ReplaceWith(new StLoc(v, inst.Value)); |
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return true; |
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} |
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return false; |
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} |
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protected internal override void VisitCall(Call inst) |
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{ |
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var expr = HandleCall(inst, context); |
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if (expr != null) { |
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// The resulting expression may trigger further rules, so continue visiting the replacement:
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expr.AcceptVisitor(this); |
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} else { |
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base.VisitCall(inst); |
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} |
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} |
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internal static ILInstruction HandleCall(Call inst, ILTransformContext context) |
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{ |
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if (inst.Method.IsConstructor && !inst.Method.IsStatic && inst.Method.DeclaringType.Kind == TypeKind.Struct) { |
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Debug.Assert(inst.Arguments.Count == inst.Method.Parameters.Count + 1); |
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context.Step("Transform call to struct constructor", inst); |
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// call(ref, ...)
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// => stobj(ref, newobj(...))
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var newObj = new NewObj(inst.Method); |
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newObj.ILRange = inst.ILRange; |
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newObj.Arguments.AddRange(inst.Arguments.Skip(1)); |
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var expr = new StObj(inst.Arguments[0], newObj, inst.Method.DeclaringType); |
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inst.ReplaceWith(expr); |
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return expr; |
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} |
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return null; |
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} |
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} |
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} |
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