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480 lines
13 KiB
480 lines
13 KiB
// 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 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 MatchLdcF(double value) |
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{ |
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return MatchLdcF(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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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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if (conv.Kind == ConversionKind.SignExtend) { |
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return conv.Argument.MatchLdcI(out val); |
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} else if (conv.Kind == ConversionKind.ZeroExtend && conv.InputType == StackType.I4) { |
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if (conv.Argument.MatchLdcI(out val)) { |
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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(out ILVariable variable) |
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{ |
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switch (this) { |
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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(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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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, 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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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, 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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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(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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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(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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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(out BlockContainer targetContainer, 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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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, 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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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(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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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(out ILInstruction condition, out ILInstruction trueInst, out ILInstruction falseInst) |
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{ |
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var inst = this as IfInstruction; |
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if (inst != null) { |
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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(out ILInstruction condition, out ILInstruction trueInst, out ILInstruction falseInst) |
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{ |
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if (MatchIfInstruction(out condition, out trueInst, out falseInst)) { |
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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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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(out ILInstruction condition, 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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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(out ILInstruction lhs, 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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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(out ILInstruction lhs, 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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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(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(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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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(out ILInstruction left, out ILInstruction right) |
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{ |
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if (this.MatchLogicNot(out var arg) && arg is Comp nestedComp && nestedComp.Kind == ComparisonKind.Inequality && !nestedComp.IsLifted) { |
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left = nestedComp.Left; |
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right = nestedComp.Right; |
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return true; |
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} else if (this is Comp comp && comp.Kind == ComparisonKind.Equality && !comp.IsLifted) { |
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left = comp.Left; |
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right = comp.Right; |
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return true; |
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} else { |
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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(out ILInstruction arg) |
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{ |
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if (!MatchCompEquals(out var left, out var right)) { |
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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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arg = left; |
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return true; |
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} else if (left.MatchLdNull()) { |
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arg = right; |
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return true; |
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} else { |
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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(out ILInstruction left, out ILInstruction right) |
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{ |
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if (this.MatchLogicNot(out var arg) && arg is Comp nestedComp && nestedComp.Kind == ComparisonKind.Equality && !nestedComp.IsLifted) { |
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left = nestedComp.Left; |
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right = nestedComp.Right; |
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return true; |
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} else if (this is Comp comp && comp.Kind == ComparisonKind.Inequality && !comp.IsLifted) { |
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left = comp.Left; |
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right = comp.Right; |
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return true; |
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} else { |
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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(out ILInstruction target, 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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target = ldflda.Target; |
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field = ldflda.Field; |
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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(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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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(out IField field, 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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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(out ILInstruction target, out IField field, 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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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, out ILInstruction left, 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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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, out ILInstruction left, 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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@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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/// <summary> |
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/// If this instruction is a conversion of the specified kind, return its argument. |
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/// Otherwise, return the instruction itself. |
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/// </summary> |
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/// <remarks> |
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/// Does not unwrap lifted conversions. |
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/// </remarks> |
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public virtual ILInstruction UnwrapConv(ConversionKind kind) |
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{ |
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return this; |
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} |
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} |
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}
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