mirror of https://github.com/icsharpcode/ILSpy.git
Siegfried Pammer
4 years ago
7 changed files with 319 additions and 225 deletions
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// Copyright (c) 2021 Daniel Grunwald, 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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#nullable enable |
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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 PatternMatchingRefTypesTransform : IStatementTransform |
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{ |
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/// <summary>
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/// stloc V(isinst T(testedOperand))
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/// call Use(..., comp.o(ldloc V != ldnull))
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/// =>
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/// call Use(..., match.type[T].notnull(V = testedOperand))
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///
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/// - or -
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///
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/// stloc S(isinst T(testedOperand))
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/// stloc V(ldloc S)
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/// call Use(..., comp.o(ldloc S != ldnull))
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/// =>
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/// call Use(..., match.type[T].notnull(V = testedOperand))
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/// </summary>
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void IStatementTransform.Run(Block block, int pos, StatementTransformContext context) |
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{ |
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if (!context.Settings.PatternMatching) |
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return; |
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int startPos = pos; |
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if (!block.Instructions[pos].MatchStLoc(out var s, out var value)) |
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return; |
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IType? unboxType; |
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if (value is UnboxAny unboxAny) |
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{ |
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// stloc S(unbox.any T(isinst T(testedOperand)))
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unboxType = unboxAny.Type; |
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value = unboxAny.Argument; |
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} |
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else |
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{ |
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unboxType = null; |
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} |
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if (value is not IsInst { Argument: var testedOperand, Type: var type }) |
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return; |
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if (type.IsReferenceType != true) |
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return; |
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if (!(unboxType == null || type.Equals(unboxType))) |
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return; |
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if (!s.IsSingleDefinition) |
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return; |
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if (s.Kind is not (VariableKind.Local or VariableKind.StackSlot)) |
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return; |
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pos++; |
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ILVariable v; |
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if (block.Instructions.ElementAtOrDefault(pos) is StLoc stloc && stloc.Value.MatchLdLoc(s)) |
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{ |
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v = stloc.Variable; |
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pos++; |
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if (!v.IsSingleDefinition) |
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return; |
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if (v.Kind is not (VariableKind.Local or VariableKind.StackSlot)) |
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return; |
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if (s.LoadCount != 2) |
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return; |
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} |
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else |
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{ |
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v = s; |
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} |
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if (!v.Type.Equals(type)) |
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return; |
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if (pos >= block.Instructions.Count) |
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return; |
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var result = ILInlining.FindLoadInNext(block.Instructions[pos], s, testedOperand, InliningOptions.None); |
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if (result.Type != ILInlining.FindResultType.Found) |
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return; |
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if (result.LoadInst is not LdLoc) |
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return; |
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bool invertCondition; |
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if (result.LoadInst.Parent!.MatchCompNotEqualsNull(out _)) |
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{ |
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invertCondition = false; |
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} |
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else if (result.LoadInst.Parent!.MatchCompEqualsNull(out _)) |
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{ |
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invertCondition = true; |
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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($"Type pattern matching {v.Name}", block.Instructions[pos]); |
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// call Use(..., match.type[T](V = testedOperand))
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var target = result.LoadInst.Parent; |
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ILInstruction matchInstruction = new MatchInstruction(v, testedOperand) { |
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CheckNotNull = true, |
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CheckType = true |
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}; |
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if (invertCondition) |
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{ |
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matchInstruction = Comp.LogicNot(matchInstruction); |
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} |
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target.ReplaceWith(matchInstruction.WithILRange(target)); |
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block.Instructions.RemoveRange(startPos, pos - startPos); |
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v.Kind = VariableKind.PatternLocal; |
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} |
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} |
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} |
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