mirror of
https://github.com/AssetRipper/ILSpy.git
synced 2026-11-13 20:05:48 -10:00
586 lines
15 KiB
C#
586 lines
15 KiB
C#
#nullable enable
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// Copyright (c) 2014 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.Diagnostics.CodeAnalysis;
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using ICSharpCode.Decompiler.TypeSystem;
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namespace ICSharpCode.Decompiler.IL
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{
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partial class ILInstruction
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{
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public bool MatchLdcI4(int val)
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{
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return OpCode == OpCode.LdcI4 && ((LdcI4)this).Value == val;
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}
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public bool MatchLdcF4(float value)
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{
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return MatchLdcF4(out var v) && v == value;
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}
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public bool MatchLdcF8(double value)
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{
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return MatchLdcF8(out var v) && v == value;
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}
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/// <summary>
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/// Matches ldc.i4, ldc.i8, and extending conversions.
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/// </summary>
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public bool MatchLdcI(out long val)
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{
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if (MatchLdcI8(out val))
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return true;
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if (MatchLdcI4(out int intVal))
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{
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val = intVal;
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return true;
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}
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if (this is Conv conv)
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{
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if (conv.Kind == ConversionKind.SignExtend)
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{
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return conv.Argument.MatchLdcI(out val);
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}
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else if (conv.Kind == ConversionKind.ZeroExtend && conv.InputType == StackType.I4)
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{
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if (conv.Argument.MatchLdcI(out val))
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{
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// clear top 32 bits
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val &= uint.MaxValue;
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return true;
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}
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}
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}
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return false;
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}
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public bool MatchLdcI(long val)
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{
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return MatchLdcI(out long v) && v == val;
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}
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public bool MatchLdLoc(ILVariable? variable)
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{
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var inst = this as LdLoc;
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return inst != null && inst.Variable == variable;
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}
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public bool MatchLdLoca(ILVariable? variable)
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{
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var inst = this as LdLoca;
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return inst != null && inst.Variable == variable;
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}
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/// <summary>
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/// Matches either ldloc (if the variable is a reference type), or ldloca (otherwise).
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/// </summary>
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public bool MatchLdLocRef(ILVariable? variable)
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{
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return MatchLdLocRef(out var v) && v == variable;
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}
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/// <summary>
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/// Matches either ldloc (if the variable is a reference type), or ldloca (otherwise).
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/// </summary>
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public bool MatchLdLocRef([NotNullWhen(true)] out ILVariable? variable)
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{
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switch (this)
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{
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case LdLoc ldloc:
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variable = ldloc.Variable;
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return variable.Type.IsReferenceType == true;
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case LdLoca ldloca:
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variable = ldloca.Variable;
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return variable.Type.IsReferenceType != true || variable.Type.Kind == TypeKind.TypeParameter;
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default:
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variable = null;
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return false;
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}
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}
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public bool MatchLdThis()
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{
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var inst = this as LdLoc;
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return inst != null && inst.Variable.Kind == VariableKind.Parameter && inst.Variable.Index < 0;
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}
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public bool MatchStLoc([NotNullWhen(true)] out ILVariable? variable)
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{
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var inst = this as StLoc;
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if (inst != null)
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{
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variable = inst.Variable;
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return true;
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}
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variable = null;
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return false;
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}
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public bool MatchStLoc(ILVariable? variable, [NotNullWhen(true)] out ILInstruction? value)
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{
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var inst = this as StLoc;
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if (inst != null && inst.Variable == variable)
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{
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value = inst.Value;
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return true;
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}
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value = null;
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return false;
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}
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public bool MatchLdLen(StackType type, [NotNullWhen(true)] out ILInstruction? array)
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{
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var inst = this as LdLen;
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if (inst != null && inst.ResultType == type)
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{
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array = inst.Array;
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return true;
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}
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array = null;
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return false;
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}
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public bool MatchReturn([NotNullWhen(true)] out ILInstruction? value)
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{
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var inst = this as Leave;
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if (inst != null && inst.IsLeavingFunction)
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{
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value = inst.Value;
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return true;
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}
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value = default(ILInstruction);
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return false;
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}
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public bool MatchBranch([NotNullWhen(true)] out Block? targetBlock)
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{
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var inst = this as Branch;
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if (inst != null)
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{
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targetBlock = inst.TargetBlock;
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return true;
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}
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targetBlock = null;
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return false;
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}
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public bool MatchBranch(Block? targetBlock)
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{
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var inst = this as Branch;
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return inst != null && inst.TargetBlock == targetBlock;
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}
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public bool MatchLeave([NotNullWhen(true)] out BlockContainer? targetContainer, [NotNullWhen(true)] out ILInstruction? value)
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{
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var inst = this as Leave;
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if (inst != null)
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{
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targetContainer = inst.TargetContainer;
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value = inst.Value;
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return true;
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}
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targetContainer = null;
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value = null;
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return false;
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}
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public bool MatchLeave(BlockContainer? targetContainer, [NotNullWhen(true)] out ILInstruction? value)
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{
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var inst = this as Leave;
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if (inst != null && targetContainer == inst.TargetContainer)
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{
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value = inst.Value;
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return true;
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}
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value = null;
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return false;
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}
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public bool MatchLeave([NotNullWhen(true)] out BlockContainer? targetContainer)
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{
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var inst = this as Leave;
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if (inst != null && inst.Value.MatchNop())
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{
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targetContainer = inst.TargetContainer;
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return true;
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}
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targetContainer = null;
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return false;
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}
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public bool MatchLeave(BlockContainer? targetContainer)
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{
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var inst = this as Leave;
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return inst != null && inst.TargetContainer == targetContainer && inst.Value.MatchNop();
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}
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public bool MatchIfInstruction([NotNullWhen(true)] out ILInstruction? condition, [NotNullWhen(true)] out ILInstruction? trueInst, [NotNullWhen(true)] out ILInstruction? falseInst)
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{
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if (this is IfInstruction inst)
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{
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condition = inst.Condition;
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trueInst = inst.TrueInst;
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falseInst = inst.FalseInst;
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return true;
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}
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condition = null;
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trueInst = null;
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falseInst = null;
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return false;
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}
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public bool MatchIfInstructionPositiveCondition([NotNullWhen(true)] out ILInstruction? condition, [NotNullWhen(true)] out ILInstruction? trueInst, [NotNullWhen(true)] out ILInstruction? falseInst)
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{
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if (MatchIfInstruction(out condition, out trueInst, out falseInst))
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{
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// Swap trueInst<>falseInst for every logic.not in the condition.
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while (condition.MatchLogicNot(out var arg))
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{
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condition = arg;
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ILInstruction? tmp = trueInst;
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trueInst = falseInst;
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falseInst = tmp;
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}
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return true;
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}
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return false;
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}
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/// <summary>
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/// Matches an if instruction where the false instruction is a nop.
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/// </summary>
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public bool MatchIfInstruction([NotNullWhen(true)] out ILInstruction? condition, [NotNullWhen(true)] out ILInstruction? trueInst)
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{
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var inst = this as IfInstruction;
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if (inst != null && inst.FalseInst.MatchNop())
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{
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condition = inst.Condition;
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trueInst = inst.TrueInst;
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return true;
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}
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condition = null;
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trueInst = null;
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return false;
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}
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/// <summary>
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/// Matches a 'logic and' instruction ("if (a) b else ldc.i4 0").
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/// Note: unlike C# '&&', this instruction is not limited to booleans,
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/// but allows passing through arbitrary I4 values on the rhs (but not on the lhs).
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/// </summary>
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public bool MatchLogicAnd([NotNullWhen(true)] out ILInstruction? lhs, [NotNullWhen(true)] out ILInstruction? rhs)
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{
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var inst = this as IfInstruction;
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if (inst != null && inst.FalseInst.MatchLdcI4(0))
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{
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lhs = inst.Condition;
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rhs = inst.TrueInst;
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return true;
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}
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lhs = null;
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rhs = null;
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return false;
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}
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/// <summary>
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/// Matches a 'logic or' instruction ("if (a) ldc.i4 1 else b").
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/// Note: unlike C# '||', this instruction is not limited to booleans,
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/// but allows passing through arbitrary I4 values on the rhs (but not on the lhs).
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/// </summary>
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public bool MatchLogicOr([NotNullWhen(true)] out ILInstruction? lhs, [NotNullWhen(true)] out ILInstruction? rhs)
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{
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var inst = this as IfInstruction;
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if (inst != null && inst.TrueInst.MatchLdcI4(1))
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{
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lhs = inst.Condition;
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rhs = inst.FalseInst;
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return true;
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}
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lhs = null;
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rhs = null;
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return false;
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}
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/// <summary>
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/// Matches an logical negation.
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/// </summary>
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public bool MatchLogicNot([NotNullWhen(true)] out ILInstruction? arg)
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{
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if (this is Comp comp && comp.Kind == ComparisonKind.Equality
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&& comp.LiftingKind == ComparisonLiftingKind.None
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&& comp.Right.MatchLdcI4(0))
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{
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arg = comp.Left;
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return true;
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}
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arg = null;
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return false;
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}
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public bool MatchTryCatchHandler([NotNullWhen(true)] out ILVariable? variable)
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{
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var inst = this as TryCatchHandler;
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if (inst != null)
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{
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variable = inst.Variable;
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return true;
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}
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variable = null;
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return false;
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}
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/// <summary>
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/// Matches comp(left == right) or logic.not(comp(left != right)).
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/// </summary>
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public bool MatchCompEquals([NotNullWhen(true)] out ILInstruction? left, [NotNullWhen(true)] out ILInstruction? right)
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{
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ILInstruction thisInst = this;
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var compKind = ComparisonKind.Equality;
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while (thisInst.MatchLogicNot(out var arg) && arg is Comp)
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{
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thisInst = arg;
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if (compKind == ComparisonKind.Equality)
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compKind = ComparisonKind.Inequality;
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else
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compKind = ComparisonKind.Equality;
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}
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if (thisInst is Comp comp && comp.Kind == compKind && !comp.IsLifted)
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{
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left = comp.Left;
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right = comp.Right;
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return true;
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}
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else
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{
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left = null;
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right = null;
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return false;
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}
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}
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/// <summary>
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/// Matches 'comp(arg == ldnull)'
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/// </summary>
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public bool MatchCompEqualsNull([NotNullWhen(true)] out ILInstruction? arg)
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{
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if (!MatchCompEquals(out var left, out var right))
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{
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arg = null;
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return false;
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}
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if (right.MatchLdNull())
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{
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arg = left;
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return true;
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}
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else if (left.MatchLdNull())
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{
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arg = right;
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return true;
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}
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else
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{
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arg = null;
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return false;
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}
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}
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/// <summary>
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/// Matches 'comp(arg != ldnull)'
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/// </summary>
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public bool MatchCompNotEqualsNull([NotNullWhen(true)] out ILInstruction? arg)
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{
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if (!MatchCompNotEquals(out var left, out var right))
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{
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arg = null;
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return false;
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}
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if (right.MatchLdNull())
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{
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arg = left;
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return true;
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}
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else if (left.MatchLdNull())
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{
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arg = right;
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return true;
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}
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else
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{
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arg = null;
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return false;
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}
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}
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/// <summary>
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/// Matches comp(left != right) or logic.not(comp(left == right)).
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/// </summary>
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public bool MatchCompNotEquals([NotNullWhen(true)] out ILInstruction? left, [NotNullWhen(true)] out ILInstruction? right)
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{
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ILInstruction thisInst = this;
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var compKind = ComparisonKind.Inequality;
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while (thisInst.MatchLogicNot(out var arg) && arg is Comp)
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{
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thisInst = arg;
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if (compKind == ComparisonKind.Equality)
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compKind = ComparisonKind.Inequality;
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else
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compKind = ComparisonKind.Equality;
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}
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if (thisInst is Comp comp && comp.Kind == compKind && !comp.IsLifted)
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{
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left = comp.Left;
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right = comp.Right;
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return true;
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}
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else
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{
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left = null;
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right = null;
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return false;
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}
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}
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public bool MatchLdFld([NotNullWhen(true)] out ILInstruction? target, [NotNullWhen(true)] out IField? field)
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{
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if (this is LdObj ldobj && ldobj.Target is LdFlda ldflda && ldobj.UnalignedPrefix == 0 && !ldobj.IsVolatile)
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{
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field = ldflda.Field;
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if (field.DeclaringType.IsReferenceType == true || !ldflda.Target.MatchAddressOf(out target, out _))
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{
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target = ldflda.Target;
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}
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return true;
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}
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target = null;
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field = null;
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return false;
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}
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public bool MatchLdsFld([NotNullWhen(true)] out IField? field)
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{
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if (this is LdObj ldobj && ldobj.Target is LdsFlda ldsflda && ldobj.UnalignedPrefix == 0 && !ldobj.IsVolatile)
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{
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field = ldsflda.Field;
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return true;
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}
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field = null;
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return false;
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}
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public bool MatchLdsFld(IField? field)
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{
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return MatchLdsFld(out var f) && f.Equals(field);
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}
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public bool MatchStsFld([NotNullWhen(true)] out IField? field, [NotNullWhen(true)] out ILInstruction? value)
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{
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if (this is StObj stobj && stobj.Target is LdsFlda ldsflda && stobj.UnalignedPrefix == 0 && !stobj.IsVolatile)
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{
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field = ldsflda.Field;
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value = stobj.Value;
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return true;
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}
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field = null;
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value = null;
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return false;
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}
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public bool MatchStFld([NotNullWhen(true)] out ILInstruction? target, [NotNullWhen(true)] out IField? field, [NotNullWhen(true)] out ILInstruction? value)
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{
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if (this is StObj stobj && stobj.Target is LdFlda ldflda && stobj.UnalignedPrefix == 0 && !stobj.IsVolatile)
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{
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target = ldflda.Target;
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field = ldflda.Field;
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value = stobj.Value;
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return true;
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}
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target = null;
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field = null;
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value = null;
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return false;
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}
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public bool MatchBinaryNumericInstruction(BinaryNumericOperator @operator)
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{
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var op = this as BinaryNumericInstruction;
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return op != null && op.Operator == @operator;
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}
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public bool MatchBinaryNumericInstruction(BinaryNumericOperator @operator, [NotNullWhen(true)] out ILInstruction? left, [NotNullWhen(true)] out ILInstruction? right)
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{
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var op = this as BinaryNumericInstruction;
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if (op != null && op.Operator == @operator)
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{
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left = op.Left;
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right = op.Right;
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return true;
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}
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left = null;
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right = null;
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return false;
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}
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public bool MatchBinaryNumericInstruction(out BinaryNumericOperator @operator, [NotNullWhen(true)] out ILInstruction? left, [NotNullWhen(true)] out ILInstruction? right)
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{
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var op = this as BinaryNumericInstruction;
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if (op != null)
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{
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@operator = op.Operator;
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left = op.Left;
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right = op.Right;
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return true;
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}
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@operator = BinaryNumericOperator.None;
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left = null;
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right = null;
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return false;
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}
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public bool MatchDefaultOrNullOrZero()
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{
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switch (this)
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{
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case LdNull _:
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case LdcF4 { Value: 0 }:
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case LdcF8 { Value: 0 }:
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case LdcI4 { Value: 0 }:
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case LdcI8 { Value: 0 }:
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case DefaultValue _:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
/// If this instruction is a conversion of the specified kind, return its argument.
|
|
/// Otherwise, return the instruction itself.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// Does not unwrap lifted conversions.
|
|
/// </remarks>
|
|
public virtual ILInstruction UnwrapConv(ConversionKind kind)
|
|
{
|
|
return this;
|
|
}
|
|
}
|
|
}
|