private void ExecuteInstruction(VMStackFrame frame)
{
var instruction = frame.GetCurrentInstruction();
var opcode = instruction.Opcode;
if (opcode >= 256)
{
BHAV bhav = null;
GameIffResource CodeOwner;
if (opcode >= 8192)
{
CodeOwner = frame.Callee.SemiGlobal.Resource;
bhav = frame.Callee.SemiGlobal.Resource.Get <BHAV>(opcode);
}
else if (opcode >= 4096)
{
/** Private sub-routine call **/
CodeOwner = frame.CalleePrivate;
bhav = frame.CalleePrivate.Get <BHAV>(opcode);
}
else
{
/** Global sub-routine call **/
CodeOwner = frame.Global.Resource;
bhav = frame.Global.Resource.Get <BHAV>(opcode);
}
var operand = frame.GetCurrentOperand <VMSubRoutineOperand>();
ExecuteSubRoutine(frame, bhav, CodeOwner, operand);
NextInstruction();
return;
}
var primitive = Context.GetPrimitive(opcode);
if (primitive == null)
{
throw new Exception("Unknown primitive!");
//HandleResult(frame, instruction, VMPrimitiveExitCode.GOTO_TRUE);
//return;
//Pop(VMPrimitiveExitCode.ERROR);
}
VMPrimitiveHandler handler = primitive.GetHandler();
var result = handler.Execute(frame);
HandleResult(frame, instruction, result);
}
public VMPrimitiveRegistration(VMPrimitiveHandler handler)
{
this.Handler = handler;
}
public VMPrimitiveRegistration(VMPrimitiveHandler handler)
{
this.Handler = handler;
}