mirror of https://github.com/icsharpcode/ILSpy.git
Siegfried Pammer
3 years ago
9 changed files with 220 additions and 8 deletions
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@@ -0,0 +1,132 @@
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// Copyright (c) 2021 Siegfried Pammer
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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.Diagnostics; |
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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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public class InterpolatedStringTransform : IStatementTransform |
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{ |
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void IStatementTransform.Run(Block block, int pos, StatementTransformContext context) |
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{ |
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if (!context.Settings.StringInterpolation) |
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return; |
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int interpolationStart = pos; |
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int interpolationEnd; |
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ILInstruction insertionPoint; |
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// stloc v(newobj DefaultInterpolatedStringHandler..ctor(ldc.i4 literalLength, ldc.i4 formattedCount))
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if (block.Instructions[pos] is StLoc |
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{ |
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Variable: ILVariable { Kind: VariableKind.Local } v, |
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Value: NewObj { Arguments: { Count: 2 } } newObj |
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} stloc |
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&& v.Type.IsKnownType(KnownTypeCode.DefaultInterpolatedStringHandler) |
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&& newObj.Method.DeclaringType.IsKnownType(KnownTypeCode.DefaultInterpolatedStringHandler) |
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&& newObj.Arguments[0].MatchLdcI4(out _) |
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&& newObj.Arguments[1].MatchLdcI4(out _)) |
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{ |
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// { call MethodName(ldloca v, ...) }
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do |
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{ |
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pos++; |
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} |
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while (IsKnownCall(block, pos, v)); |
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interpolationEnd = pos; |
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// ... call ToStringAndClear(ldloca v) ...
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if (!FindToStringAndClear(block, pos, interpolationStart, interpolationEnd, v, out insertionPoint)) |
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{ |
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return; |
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} |
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if (!(v.StoreCount == 1 && v.AddressCount == interpolationEnd - interpolationStart && v.LoadCount == 0)) |
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{ |
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return; |
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} |
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} |
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else |
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{ |
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return; |
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} |
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context.Step($"Transform DefaultInterpolatedStringHandler {v.Name}", stloc); |
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v.Kind = VariableKind.InitializerTarget; |
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var replacement = new Block(BlockKind.InterpolatedString); |
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for (int i = interpolationStart; i < interpolationEnd; i++) |
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{ |
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replacement.Instructions.Add(block.Instructions[i]); |
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} |
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var callToStringAndClear = insertionPoint; |
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insertionPoint.ReplaceWith(replacement); |
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replacement.FinalInstruction = callToStringAndClear; |
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block.Instructions.RemoveRange(interpolationStart, interpolationEnd - interpolationStart); |
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} |
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private bool IsKnownCall(Block block, int pos, ILVariable v) |
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{ |
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if (pos >= block.Instructions.Count - 1) |
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return false; |
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if (!(block.Instructions[pos] is Call call)) |
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return false; |
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if (!(call.Arguments.Count > 1)) |
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return false; |
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if (!call.Arguments[0].MatchLdLoca(v)) |
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return false; |
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if (call.Method.IsStatic) |
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return false; |
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if (!call.Method.DeclaringType.IsKnownType(KnownTypeCode.DefaultInterpolatedStringHandler)) |
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return false; |
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switch (call.Method.Name) |
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{ |
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case "AppendLiteral" when call.Arguments.Count == 2 && call.Arguments[1] is LdStr: |
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case "AppendFormatted" when call.Arguments.Count == 2: |
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case "AppendFormatted" when call.Arguments.Count == 3 && call.Arguments[2] is LdStr: |
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case "AppendFormatted" when call.Arguments.Count == 3 && call.Arguments[2] is LdcI4: |
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case "AppendFormatted" when call.Arguments.Count == 4 && call.Arguments[2] is LdcI4 && call.Arguments[3] is LdStr: |
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break; |
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default: |
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return false; |
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} |
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return true; |
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} |
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private bool FindToStringAndClear(Block block, int pos, int interpolationStart, int interpolationEnd, ILVariable v, out ILInstruction insertionPoint) |
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{ |
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insertionPoint = null; |
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if (pos >= block.Instructions.Count) |
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return false; |
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// find
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// ... call ToStringAndClear(ldloca v) ...
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// in block.Instructions[pos]
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for (int i = interpolationStart; i < interpolationEnd; i++) |
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{ |
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var result = ILInlining.FindLoadInNext(block.Instructions[pos], v, block.Instructions[i], InliningOptions.None); |
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if (result.Type != ILInlining.FindResultType.Found) |
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return false; |
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insertionPoint ??= result.LoadInst.Parent; |
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Debug.Assert(insertionPoint == result.LoadInst.Parent); |
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} |
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return insertionPoint is Call |
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{ |
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Arguments: { Count: 1 }, |
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Method: { Name: "ToStringAndClear", IsStatic: false } |
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}; |
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} |
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} |
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} |
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