private void Parse()
{
string[] components = SourceAsm.Split((char[])null, StringSplitOptions.RemoveEmptyEntries);
if (components.Length == 0 || components.Length > 3)
{
throw new Exception(String.Format("ERROR: Line {0} : Too many arguments", LineNumber));
}
// Parse the op code and 2 params
Instruction = new Instruction(LineNumber, components[0]);
// If params are passed a null string to parse they will default to 'unused' type and value of zero
string lParam = (components.Length >= 2) ? components[1] : null;
string rParam = (components.Length == 3) ? components[2] : null;
// Bit of a hack for jump instructions
// JMP has one param but the parm has to be forced into the 8 bit rparam
if (Instruction._OpCode == OpCode.JMP ||
Instruction._OpCode == OpCode.JE ||
Instruction._OpCode == OpCode.JNE ||
Instruction._OpCode == OpCode.JZ ||
Instruction._OpCode == OpCode.JNZ ||
Instruction._OpCode == OpCode.CMP)
{
rParam = lParam;
lParam = null;
}
LeftParam = new InstructionParameter(LineNumber, lParam);
RightParam = new InstructionParameter(LineNumber, rParam);
Validate();
}
public void Parse()
{
int intValue = 0;
// Param is a register
GeneralPurposeRegisterId reg;
if (Int32.TryParse(SourceAsm, out intValue) == false &&
Enum.TryParse(SourceAsm, out reg) &&
Enum.IsDefined(reg.GetType(), reg))
{
Value = (byte)reg;
Type = ParamType.Reg;
return;
}
// Check if param is a number (hex or dec)
if (SourceAsm.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
{
intValue = Convert.ToInt32(SourceAsm, 16);
Type = ParamType.Int;
}
else if (Int32.TryParse(SourceAsm, out intValue))
{
Type = ParamType.Int;
}
if (Type == ParamType.Int)
{
if (intValue < -128 || intValue > 255)
{
throw new Exception(String.Format("ERROR: Line {0} : Param out of range", LineNumber));
}
Value = (byte)intValue;
return;
}
throw new Exception(String.Format("ERROR: Line {0} : Unknown Parameter value - {1}", LineNumber, SourceAsm));
}