private InstructionStub RecognizeInstruction()
{
InstructionStub instrStub = null;
byte[] opcode;
int opcodeLength = 1;
do
{
opcode = ModuleReader.PeekBytes(opcodeLength);
instrStub = OpcodeTable.GetValueOrDefault(opcode.ToImmutableArray());
if (instrStub == null)
{
opcodeLength++;
}
} while (instrStub == null && opcodeLength <= 3);
if (instrStub == null)
{
throw new UnrecognizedInstructionException();
}
Position += opcodeLength;
return(instrStub);
}
private Instruction NextInstruction()
{
InstructionStub instrStub = null;
int instrOffset = Position;
instrStub = RecognizeInstruction();
string typeName = $"{NamespaceName}.{instrStub.Name}{nameof(Instruction)}";
var type = Type.GetType(typeName);
if (type == null)
{
type = typeof(GenericInstruction);
}
var instruction = (Instruction)Activator.CreateInstance(type);
instruction.Name = instrStub.Name;
instruction.Opcode = instrStub.Opcode;
var operandBuilder = ImmutableArray.CreateBuilder <Operand>();
var typeInfo = instruction.GetType().GetTypeInfo();
foreach (var operandStub in instrStub.OperandStubs)
{
var operand = ReadOperand(operandStub);
operand.Name = operandStub.Name;
operandBuilder.Add(operand);
if (!(instruction is GenericInstruction))
{
var propertyInfo = typeInfo.GetDeclaredProperty(operandStub.Name);
if (propertyInfo != null)
{
typeInfo.GetDeclaredProperty(operandStub.Name).SetValue(instruction, operand);
}
}
}
instruction.Offset = instrOffset;
instruction.Length = Position - instrOffset;
instruction.Operands = operandBuilder.ToImmutable();
return(instruction);
}
