private bool ParseLabeledInstructionOperand(ParseTreeNode node, Block block, out Instruction.OperandElement res)
{
List <Label> labelList = new List <Label>();
ParseTreeNode operandNode = node;
while (true)
{
if (operandNode.ChildNodes.Count == 1)
{ //instrOperand
operandNode = operandNode.ChildNodes[0];
break;
}
else if (operandNode.ChildNodes.Count == 2)
{ //label + labeledInstrOperands
ParseTreeNode lblNode = operandNode.ChildNodes[0];
Label lbl = new Label()
{
AssemblePosition = new Assemble.AssemblePosition(this.ParsingFilePath, lblNode),
Name = lblNode.ChildNodes[0].Token.Text,
DefinedBlock = block
};
labelList.Add(lbl);
operandNode = operandNode.ChildNodes[1];
}
}
if (!ParseInstructionOperand(operandNode, block, labelList, out res))
{
return(false);
}
return(true);
}
protected static bool CheckRegisterOperand(Instruction.OperandElement operand, int rangeMin, int rangeMax)
{
if (operand.Immediate.Type != ValueBaseType.Register)
{
return(false);
}
if (operand.RegisterNo < rangeMin || operand.RegisterNo > rangeMax)
{
return(false);
}
return(true);
}
protected static bool CheckImmediateOperand(Instruction.OperandElement operand, int rangeMin, int rangeMax)
{
if (operand.Immediate.Type != ValueBaseType.Immediate)
{
return(false);
}
int imm = (int)operand.Immediate.GetValue(BytesPerWord);
if (imm < rangeMin || imm > rangeMax)
{
return(false);
}
return(true);
}
protected static bool ConvertRegisterName(Instruction.OperandElement operand, int operandIndex, List <AssembleError> errorList)
{
if (operand.Immediate.Type != ValueBaseType.Register)
{
return(true);
}
RegisterInfo reginfo = operand.Immediate.GetRegister();
if (!reginfo.IsSpecifiedByName)
{
operand.RegisterNo = reginfo.No; //Copy
return(true);
}
RegisterMapping.RegisterElement e;
if (!SubRiscAssembler.RegisterMapping.SearchByName(reginfo.Name, out e))
{
errorList.Add(new Interface.Assemble.AssembleError()
{
Title = "Assemble",
Detail = $"Invalid register name '{e.Name}'",
Position = operand.AssemblePosition
});
return(false);
}
if (e.GetRegisterNumber(operandIndex) < 0)
{
errorList.Add(new Interface.Assemble.AssembleError()
{
Title = "Assemble",
Detail = $"Register ${e.Name} cannot be used for {operandIndex+1}th operand",
Position = operand.AssemblePosition
});
return(false);
}
operand.RegisterNo = e.GetRegisterNumber(operandIndex);
return(true);
}
private bool ParseInstructionOperand(ParseTreeNode node, Block block, List <Label> labels, out Instruction.OperandElement res)
{
res = new Assemble.Instruction.OperandElement();
res.AssemblePosition = new Assemble.AssemblePosition(this.ParsingFilePath, node);
res.Labels = labels;
foreach (var e in labels)
{
e.SetLabelPlacedInfo(res.PlacedInfo);
}
ParseTreeNode op = node.ChildNodes[0];
if (op.Term.Name == "operand-register")
{
ValueBase val;
if (!ParseRegisterInfo(op, block, out val))
{
return(false);
}
res.Immediate = val;
return(true);
}
else if (op.Term.Name == "operand-reference")
{ //Recognize as immediate
res.Immediate = new ValueReference(op.ChildNodes[0].Token.Text, block);
res.Immediate.AssemblePosition = res.AssemblePosition;
return(true);
}
else if (op.Term.Name == "operand-immediate")
{
ValueBase val;
if (!ParseImmediateValue(op.ChildNodes[0], block, out val))
{
return(false);
}
res.Immediate = val;
return(true);
}
ReportError("InstructionOperand", "Unknown instruction operand type.", op);
return(false);
}