/// <summary>
/// Obtains a reference to the singleton
/// </summary>
/// <returns>The reference</returns>
public static OpCodesMap GetSingleton()
{
if (OpCodesMap._singleton == null)
{
OpCodesMap._singleton = new OpCodesMap();
}
return(OpCodesMap._singleton);
}
/// <summary>
/// Returns an array of instructions that describe the code portion of this method.
/// </summary>
/// <returns>The array of instructions</returns>
private ILInstruction[] GetInstructions(byte[] fromILBytes)
{
List <ILInstruction> il = new List <ILInstruction>();
OpCodesMap map = OpCodesMap.GetSingleton();
// for now iterate over the IL bytes and change them to opcodes
for (int i = 0; i < fromILBytes.Length; i++)
{
byte current = fromILBytes[i];
OpCode code = OpCodes.Nop;
if (current != 0xfe)
{
code = map.GetCode(current);
}
else
{
code = map.GetCode(BitConverter.ToInt16(fromILBytes, i));
i++;
}
ILInstruction instruction = null;
switch (code.OperandType)
{
case OperandType.InlineNone:
instruction = new InlineNoneILInstruction(code);
break;
case OperandType.ShortInlineBrTarget:
instruction = new ShortInlineBrTargetILInstruction(code, fromILBytes[i++]);
break;
case OperandType.InlineBrTarget:
instruction = new InlineBrTargetILInstruction(code, BitConverter.ToInt32(fromILBytes, i + 1));
i += 4;
break;
case OperandType.ShortInlineI:
instruction = new ShortInlineIILInstruction(code, fromILBytes[i++]);
break;
case OperandType.ShortInlineR:
instruction = new ShortInlineRILInstruction(code, BitConverter.ToSingle(fromILBytes, i + 1));
i += 4;
break;
case OperandType.ShortInlineVar:
instruction = new ShortInlineVarILInstruction(code, fromILBytes[i++]);
break;
case OperandType.InlineI:
instruction = new InlineIILInstruction(code, BitConverter.ToUInt32(fromILBytes, i + 1));
i += 4;
break;
case OperandType.InlineVar:
instruction = new InlineVarILInstruction(code, BitConverter.ToUInt16(fromILBytes, i + 1));
i += 2;
break;
case OperandType.InlineR:
instruction = new InlineRILInstruction(code, BitConverter.ToDouble(fromILBytes, i + 1));
i += 8;
break;
case OperandType.InlineI8:
instruction = new InlineI8ILInstruction(code, BitConverter.ToUInt64(fromILBytes, i + 1));
i += 8;
break;
case OperandType.InlineString:
instruction = new InlineStringILInstruction(this.Assembly, code, BitConverter.ToInt32(fromILBytes, i + 1));
i += 4;
break;
case OperandType.InlineSig:
instruction = new InlineSigILInstruction(this.Assembly, code, BitConverter.ToInt32(fromILBytes, i + 1));
i += 4;
break;
case OperandType.InlineField:
instruction = new InlineFieldILInstruction(this.Assembly, code, BitConverter.ToUInt32(fromILBytes, i + 1));
i += 4;
break;
case OperandType.InlineMethod:
instruction = new InlineMethodILInstruction(this.Assembly, code, BitConverter.ToUInt32(fromILBytes, i + 1));
i += 4;
break;
case OperandType.InlineType:
instruction = new InlineTypeILInstruction(this.Assembly, code, BitConverter.ToUInt32(fromILBytes, i + 1));
i += 4;
break;
case OperandType.InlineTok:
instruction = new InlineTokenILInstruction(this.Assembly, code, BitConverter.ToUInt32(fromILBytes, i + 1));
i += 4;
break;
case OperandType.InlineSwitch:
Int32 cases = BitConverter.ToInt32(fromILBytes, i + 1);
i += 4;
Int32[] jumpTargets = new Int32[cases];
for (Int32 counter = 0; counter < cases; counter++)
{
jumpTargets[counter] = BitConverter.ToInt32(fromILBytes, i + 1);
i += 4;
}
instruction = new InlineSwitchILInstruction(code, jumpTargets);
break;
default:
instruction = new ILInstruction(code);
break;
}
il.Add(instruction);
}
return(il.ToArray());
}
