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Move ILParser to separate file.

pull/1420/head
Siegfried Pammer 7 years ago
parent
5946b32c2e
commit
420ecb5906
3 changed files with 109 additions and 83 deletions
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  1. 108
      ICSharpCode.Decompiler/Disassembler/ILParser.cs
  2. 83
      ICSharpCode.Decompiler/Disassembler/OpCodeInfo.cs
  3. 1
      ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj

108
ICSharpCode.Decompiler/Disassembler/ILParser.cs
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@ -0,0 +1,108 @@ @@ -0,0 +1,108 @@
// Copyright (c) 2018 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.Reflection.Metadata;
using System.Reflection.Metadata.Ecma335;
using ICSharpCode.Decompiler.Metadata;
namespace ICSharpCode.Decompiler.Disassembler
{
public static class ILParser
{
public static ILOpCode DecodeOpCode(this ref BlobReader blob)
{
byte opCodeByte = blob.ReadByte();
return (ILOpCode)(opCodeByte == 0xFE ? 0xFE00 + blob.ReadByte() : opCodeByte);
}
public static void SkipOperand(this ref BlobReader blob, ILOpCode opCode)
{
switch (opCode.GetOperandType()) {
// 64-bit
case OperandType.I8:
case OperandType.R:
blob.Offset += 8;
break;
// 32-bit
case OperandType.BrTarget:
case OperandType.Field:
case OperandType.Method:
case OperandType.I:
case OperandType.Sig:
case OperandType.String:
case OperandType.Tok:
case OperandType.Type:
case OperandType.ShortR:
blob.Offset += 4;
break;
// (n + 1) * 32-bit
case OperandType.Switch:
uint n = blob.ReadUInt32();
blob.Offset += (int)(n * 4);
break;
// 16-bit
case OperandType.Variable:
blob.Offset += 2;
break;
// 8-bit
case OperandType.ShortVariable:
case OperandType.ShortBrTarget:
case OperandType.ShortI:
blob.Offset++;
break;
}
}
public static int DecodeBranchTarget(this ref BlobReader blob, ILOpCode opCode)
{
return (opCode.GetBranchOperandSize() == 4 ? blob.ReadInt32() : blob.ReadSByte()) + blob.Offset;
}
public static int[] DecodeSwitchTargets(this ref BlobReader blob)
{
int[] targets = new int[blob.ReadUInt32()];
int offset = blob.Offset + 4 * targets.Length;
for (int i = 0; i < targets.Length; i++)
targets[i] = blob.ReadInt32() + offset;
return targets;
}
public static string DecodeUserString(this ref BlobReader blob, MetadataReader metadata)
{
return metadata.GetUserString(MetadataTokens.UserStringHandle(blob.ReadInt32()));
}
public static int DecodeIndex(this ref BlobReader blob, ILOpCode opCode)
{
switch (opCode.GetOperandType()) {
case OperandType.ShortVariable:
return blob.ReadByte();
case OperandType.Variable:
return blob.ReadUInt16();
default:
throw new ArgumentException($"{opCode} not supported!");
}
}
public static bool IsReturn(this ILOpCode opCode)
{
return opCode == ILOpCode.Ret || opCode == ILOpCode.Endfilter || opCode == ILOpCode.Endfinally;
}
}
}

83
ICSharpCode.Decompiler/Disassembler/OpCodeInfo.cs
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@ -102,87 +102,4 @@ namespace ICSharpCode.Decompiler.Disassembler @@ -102,87 +102,4 @@ namespace ICSharpCode.Decompiler.Disassembler
}
}
}
public static class ILParser
{
public static ILOpCode DecodeOpCode(this ref BlobReader blob)
{
byte opCodeByte = blob.ReadByte();
return (ILOpCode)(opCodeByte == 0xFE ? 0xFE00 + blob.ReadByte() : opCodeByte);
}
public static void SkipOperand(this ref BlobReader blob, ILOpCode opCode)
{
switch (opCode.GetOperandType()) {
// 64-bit
case OperandType.I8:
case OperandType.R:
blob.Offset += 8;
break;
// 32-bit
case OperandType.BrTarget:
case OperandType.Field:
case OperandType.Method:
case OperandType.I:
case OperandType.Sig:
case OperandType.String:
case OperandType.Tok:
case OperandType.Type:
case OperandType.ShortR:
blob.Offset += 4;
break;
// (n + 1) * 32-bit
case OperandType.Switch:
uint n = blob.ReadUInt32();
blob.Offset += (int)(n * 4);
break;
// 16-bit
case OperandType.Variable:
blob.Offset += 2;
break;
// 8-bit
case OperandType.ShortVariable:
case OperandType.ShortBrTarget:
case OperandType.ShortI:
blob.Offset++;
break;
}
}
public static int DecodeBranchTarget(this ref BlobReader blob, ILOpCode opCode)
{
return (opCode.GetBranchOperandSize() == 4 ? blob.ReadInt32() : blob.ReadSByte()) + blob.Offset;
}
public static int[] DecodeSwitchTargets(this ref BlobReader blob)
{
int[] targets = new int[blob.ReadUInt32()];
int offset = blob.Offset + 4 * targets.Length;
for (int i = 0; i < targets.Length; i++)
targets[i] = blob.ReadInt32() + offset;
return targets;
}
public static string DecodeUserString(this ref BlobReader blob, MetadataReader metadata)
{
return metadata.GetUserString(MetadataTokens.UserStringHandle(blob.ReadInt32()));
}
public static int DecodeIndex(this ref BlobReader blob, ILOpCode opCode)
{
switch (opCode.GetOperandType()) {
case OperandType.ShortVariable:
return blob.ReadByte();
case OperandType.Variable:
return blob.ReadUInt16();
default:
throw new ArgumentException($"{opCode} not supported!");
}
}
public static bool IsReturn(this ILOpCode opCode)
{
return opCode == ILOpCode.Ret || opCode == ILOpCode.Endfilter || opCode == ILOpCode.Endfinally;
}
}
}

1
ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj
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@ -266,6 +266,7 @@ @@ -266,6 +266,7 @@
<Compile Include="CSharp\WholeProjectDecompiler.cs" />
<Compile Include="CSharp\Transforms\AddXmlDocumentationTransform.cs" />
<Compile Include="DecompileRun.cs" />
<Compile Include="Disassembler\ILParser.cs" />
<Compile Include="Metadata\AssemblyReferences.cs" />
<Compile Include="Metadata\CodeMappingInfo.cs" />
<Compile Include="Metadata\EnumUnderlyingTypeResolveException.cs" />

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