private bool TryScanProcedure(out ImageSymbol sym)
{
ushort us;
var addrStart = rdr.Address;
sym = null;
while (rdr.TryReadBeUInt16(out us))
{
switch (us)
{
case RTS:
case JMP_A0:
// Found what looks like a terminator.
break;
case RTD:
// Read uint16 of bytes to pop.
if (!rdr.TryReadBeUInt16(out us))
{
return(false);
}
// looks like a RTD xxx instruction.
break;
default:
// Any other words are quietly eaten.
continue;
}
// Remember the end of the procedure.
var position = rdr.Offset;
// We think we saw the end of the procedure. Could there be a MacsBug symbol?
string symbol;
if (!TryReadMacsBugSymbol(out symbol))
{
// Don't really want a symbol in this case.
// But there might be more procedures.
continue;
}
if (!SkipConstantData())
{
// That wasn't valid constant data, but there might be more procedures.
// But there might be more procedures.
continue;
}
sym = new ImageSymbol(addrStart)
{
Type = SymbolType.Procedure, Name = symbol
};
return(true);
}
return(false);
}
private bool TryScanProcedure(out ImageSymbol sym)
{
ushort us;
var addrStart = rdr.Address;
sym = null;
for (;;)
{
if (!rdr.TryReadBeUInt16(out us))
{
return(false);
}
if (us == RTS || us == JMP_A0)
{
// Found what looks like a terminator.
break;
}
if (us == RTD)
{
if (!rdr.TryReadBeUInt16(out us))
{
return(false);
}
// looks like a RTD xxx instruction.
break;
}
}
// Remember the end of the procedure.
var position = rdr.Offset;
// We think we saw the end of the procedure. Could there be a MacsBug symbol?
string symbol;
if (!TryReadMacsBugSymbol(out symbol))
{
// Don't really want a symbol in this case.
sym = new ImageSymbol {
Type = SymbolType.Unknown
};
// But there might be more procedures.
return(true);
}
if (!SkipConstantData())
{
// That wasn't valid constant data, but there might be more procedures.
sym = new ImageSymbol {
Type = SymbolType.Unknown
};
// But there might be more procedures.
}
else
{
sym = new ImageSymbol(addrStart)
{
Type = SymbolType.Procedure, Name = symbol
};
}
return(true);
}