private static object ResolveOperand(CilMethodBody methodBody, CilInstruction instruction,
ICilOperandResolver resolver)
{
switch (instruction.OpCode.OperandType)
{
case CilOperandType.InlineBrTarget:
case CilOperandType.ShortInlineBrTarget:
return new CilInstructionLabel(
methodBody.Instructions.GetByOffset(((ICilLabel) instruction.Operand).Offset));
case CilOperandType.InlineField:
case CilOperandType.InlineMethod:
case CilOperandType.InlineSig:
case CilOperandType.InlineTok:
case CilOperandType.InlineType:
return resolver.ResolveMember((MetadataToken) instruction.Operand);
case CilOperandType.InlineString:
return resolver.ResolveString((MetadataToken) instruction.Operand);
case CilOperandType.InlineSwitch:
var result = new List<ICilLabel>();
var labels = (IEnumerable<ICilLabel>) instruction.Operand;
foreach (var label in labels)
{
var target = methodBody.Instructions.GetByOffset(label.Offset);
result.Add(target == null ? label : new CilInstructionLabel(target));
}
return result;
case CilOperandType.InlineVar:
case CilOperandType.ShortInlineVar:
return resolver.ResolveLocalVariable(Convert.ToInt32(instruction.Operand));
case CilOperandType.InlineArgument:
case CilOperandType.ShortInlineArgument:
return resolver.ResolveParameter(Convert.ToInt32(instruction.Operand));
case CilOperandType.InlineI:
case CilOperandType.InlineI8:
case CilOperandType.InlineNone:
case CilOperandType.InlineR:
case CilOperandType.ShortInlineI:
case CilOperandType.ShortInlineR:
return instruction.Operand;
case CilOperandType.InlinePhi:
throw new NotSupportedException();
default:
throw new ArgumentOutOfRangeException();
}
}
private object ReadOperand(CilOperandType operandType)
{
switch (operandType)
{
case CilOperandType.InlineNone:
return(null);
case CilOperandType.ShortInlineI:
return(_reader.ReadSByte());
case CilOperandType.ShortInlineBrTarget:
return(new CilOffsetLabel(_reader.ReadSByte() + (int)(_reader.Offset - _reader.StartOffset)));
case CilOperandType.ShortInlineVar:
byte shortLocalIndex = _reader.ReadByte();
return(_operandResolver?.ResolveLocalVariable(shortLocalIndex) ?? shortLocalIndex);
case CilOperandType.ShortInlineArgument:
byte shortArgIndex = _reader.ReadByte();
return(_operandResolver?.ResolveParameter(shortArgIndex) ?? shortArgIndex);
case CilOperandType.InlineVar:
ushort longLocalIndex = _reader.ReadUInt16();
return(_operandResolver?.ResolveLocalVariable(longLocalIndex) ?? longLocalIndex);
case CilOperandType.InlineArgument:
ushort longArgIndex = _reader.ReadUInt16();
return(_operandResolver?.ResolveParameter(longArgIndex) ?? longArgIndex);
case CilOperandType.InlineI:
return(_reader.ReadInt32());
case CilOperandType.InlineBrTarget:
return(new CilOffsetLabel(_reader.ReadInt32() + (int)(_reader.Offset - _reader.StartOffset)));
case CilOperandType.ShortInlineR:
return(_reader.ReadSingle());
case CilOperandType.InlineI8:
return(_reader.ReadInt64());
case CilOperandType.InlineR:
return(_reader.ReadDouble());
case CilOperandType.InlineString:
var stringToken = new MetadataToken(_reader.ReadUInt32());
return(_operandResolver?.ResolveString(stringToken) ?? stringToken);
case CilOperandType.InlineField:
case CilOperandType.InlineMethod:
case CilOperandType.InlineSig:
case CilOperandType.InlineTok:
case CilOperandType.InlineType:
var memberToken = new MetadataToken(_reader.ReadUInt32());
return(_operandResolver?.ResolveMember(memberToken) ?? memberToken);
case CilOperandType.InlinePhi:
throw new NotSupportedException();
case CilOperandType.InlineSwitch:
return(ReadSwitchTable());
default:
throw new ArgumentOutOfRangeException(nameof(operandType), operandType, null);
}
}