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Add support for DefaultInterpolatedStringHandler
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132
ICSharpCode.Decompiler/IL/Transforms/InterpolatedStringTransform.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| // Copyright (c) 2021 Siegfried Pammer | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy of this | ||
| // software and associated documentation files (the "Software"), to deal in the Software | ||
| // without restriction, including without limitation the rights to use, copy, modify, merge, | ||
| // publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons | ||
| // to whom the Software is furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in all copies or | ||
| // substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, | ||
| // INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR | ||
| // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE | ||
| // FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | ||
| // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
| // DEALINGS IN THE SOFTWARE. | ||
|
|
||
| using System; | ||
| using System.Diagnostics; | ||
|
|
||
| using ICSharpCode.Decompiler.TypeSystem; | ||
|
|
||
| namespace ICSharpCode.Decompiler.IL.Transforms | ||
| { | ||
| public class InterpolatedStringTransform : IStatementTransform | ||
| { | ||
| void IStatementTransform.Run(Block block, int pos, StatementTransformContext context) | ||
| { | ||
| if (!context.Settings.StringInterpolation) | ||
| return; | ||
| int interpolationStart = pos; | ||
| int interpolationEnd; | ||
| ILInstruction insertionPoint; | ||
| // stloc v(newobj DefaultInterpolatedStringHandler..ctor(ldc.i4 literalLength, ldc.i4 formattedCount)) | ||
| if (block.Instructions[pos] is StLoc | ||
| { | ||
| Variable: ILVariable { Kind: VariableKind.Local } v, | ||
| Value: NewObj { Arguments: { Count: 2 } } newObj | ||
| } stloc | ||
| && v.Type.IsKnownType(KnownTypeCode.DefaultInterpolatedStringHandler) | ||
| && newObj.Method.DeclaringType.IsKnownType(KnownTypeCode.DefaultInterpolatedStringHandler) | ||
| && newObj.Arguments[0].MatchLdcI4(out _) | ||
| && newObj.Arguments[1].MatchLdcI4(out _)) | ||
| { | ||
| // { call MethodName(ldloca v, ...) } | ||
| do | ||
| { | ||
| pos++; | ||
| } | ||
| while (IsKnownCall(block, pos, v)); | ||
| interpolationEnd = pos; | ||
| // ... call ToStringAndClear(ldloca v) ... | ||
| if (!FindToStringAndClear(block, pos, interpolationStart, interpolationEnd, v, out insertionPoint)) | ||
| { | ||
| return; | ||
| } | ||
| if (!(v.StoreCount == 1 && v.AddressCount == interpolationEnd - interpolationStart && v.LoadCount == 0)) | ||
| { | ||
| return; | ||
| } | ||
| } | ||
| else | ||
| { | ||
| return; | ||
| } | ||
| context.Step($"Transform DefaultInterpolatedStringHandler {v.Name}", stloc); | ||
| v.Kind = VariableKind.InitializerTarget; | ||
| var replacement = new Block(BlockKind.InterpolatedString); | ||
| for (int i = interpolationStart; i < interpolationEnd; i++) | ||
| { | ||
| replacement.Instructions.Add(block.Instructions[i]); | ||
| } | ||
| var callToStringAndClear = insertionPoint; | ||
| insertionPoint.ReplaceWith(replacement); | ||
| replacement.FinalInstruction = callToStringAndClear; | ||
| block.Instructions.RemoveRange(interpolationStart, interpolationEnd - interpolationStart); | ||
| } | ||
|
|
||
| private bool IsKnownCall(Block block, int pos, ILVariable v) | ||
| { | ||
| if (pos >= block.Instructions.Count - 1) | ||
| return false; | ||
| if (!(block.Instructions[pos] is Call call)) | ||
| return false; | ||
| if (!(call.Arguments.Count > 1)) | ||
| return false; | ||
| if (!call.Arguments[0].MatchLdLoca(v)) | ||
| return false; | ||
| if (call.Method.IsStatic) | ||
| return false; | ||
| if (!call.Method.DeclaringType.IsKnownType(KnownTypeCode.DefaultInterpolatedStringHandler)) | ||
| return false; | ||
| switch (call.Method.Name) | ||
| { | ||
| case "AppendLiteral" when call.Arguments.Count == 2 && call.Arguments[1] is LdStr: | ||
| case "AppendFormatted" when call.Arguments.Count == 2: | ||
| case "AppendFormatted" when call.Arguments.Count == 3 && call.Arguments[2] is LdStr: | ||
| case "AppendFormatted" when call.Arguments.Count == 3 && call.Arguments[2] is LdcI4: | ||
| case "AppendFormatted" when call.Arguments.Count == 4 && call.Arguments[2] is LdcI4 && call.Arguments[3] is LdStr: | ||
| break; | ||
| default: | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| private bool FindToStringAndClear(Block block, int pos, int interpolationStart, int interpolationEnd, ILVariable v, out ILInstruction insertionPoint) | ||
| { | ||
| insertionPoint = null; | ||
| if (pos >= block.Instructions.Count) | ||
| return false; | ||
| // find | ||
| // ... call ToStringAndClear(ldloca v) ... | ||
| // in block.Instructions[pos] | ||
| for (int i = interpolationStart; i < interpolationEnd; i++) | ||
| { | ||
| var result = ILInlining.FindLoadInNext(block.Instructions[pos], v, block.Instructions[i], InliningOptions.None); | ||
| if (result.Type != ILInlining.FindResultType.Found) | ||
| return false; | ||
| insertionPoint ??= result.LoadInst.Parent; | ||
| Debug.Assert(insertionPoint == result.LoadInst.Parent); | ||
| } | ||
|
|
||
| return insertionPoint is Call | ||
| { | ||
| Arguments: { Count: 1 }, | ||
| Method: { Name: "ToStringAndClear", IsStatic: false } | ||
| }; | ||
| } | ||
| } | ||
| } |
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