public override void EnterInstructionStatement([NotNull] ZealCpuParser.InstructionStatementContext context)
{
_currentInstruction = new CpuInstructionStatement();
_currentInstruction.Line = context.Start.Line;
_currentInstruction.Column = context.Start.Column;
CpuInstructions opcode;
if (Enum.TryParse<CpuInstructions>(context.opcode().GetText(), out opcode))
{
_currentInstruction.Opcode = opcode;
}
}
public void ShouldGenerateAbsoluteInstruction(CpuInstructions opcodeEnum, byte finalOpcode, int value)
{
CpuInstructionStatement instruction = new CpuInstructionStatement();
instruction.AddressingMode = CpuAddressingMode.Absolute;
instruction.Opcode = opcodeEnum;
instruction.Arguments.Add(new NumberInstructionArgument(value, ArgumentSize.Word));
List<CpuInstructionStatement> instructions = new List<CpuInstructionStatement>();
instructions.Add(instruction);
MemoryStream memoryStream = new MemoryStream(8);
CpuCodeGenerator generator = new CpuCodeGenerator(memoryStream);
generator.Instructions = instructions;
generator.Generate();
Assert.Equal(finalOpcode, memoryStream.GetBuffer()[0]);
Assert.Equal((byte)(value & 0xFF), memoryStream.GetBuffer()[1]);
Assert.Equal((byte)(value >> 8), memoryStream.GetBuffer()[2]);
}
public override void ExitInterruptDeclaration([NotNull] ZealCpuParser.InterruptDeclarationContext context)
{
var rtiInstruction = new CpuInstructionStatement();
rtiInstruction.Opcode = CpuInstructions.rti;
rtiInstruction.AddressingMode = CpuAddressingMode.Implied;
_currentScope.Statements.Add(rtiInstruction);
_driver.GlobalScope.Add(_currentScope);
_currentScope = null;
}
public override void ExitInstructionStatement([NotNull] ZealCpuParser.InstructionStatementContext context)
{
if (_currentInstruction.Arguments.Count == 0)
{
_currentInstruction.AddressingMode = CpuAddressingMode.Implied;
}
var assumeAddressingAttribute = _currentInstruction.Opcode.GetAttribute<CpuAssumeAddressingAttribute>();
if (assumeAddressingAttribute != null)
{
_currentInstruction.AddressingMode = assumeAddressingAttribute.Addressing;
}
var labelContext = context.label();
if (labelContext != null)
{
_currentInstruction.AssociatedLabel = labelContext.IDENTIFIER().GetText();
}
var opcodeAttributes = EnumHelper.GetAttributes<OpcodeAttribute>(_currentInstruction.Opcode).Where(x => x.AddressingMode == _currentInstruction.AddressingMode).ToArray();
if (opcodeAttributes == null || (opcodeAttributes != null && opcodeAttributes.Length == 0))
{
string descriptionAddressingMode = EnumHelper.GetAttribute<DescriptionAttribute>(_currentInstruction.AddressingMode).Description;
addErrorMesage(String.Format("opcode '{0}' does not support {1} addressing mode.", _currentInstruction.Opcode, descriptionAddressingMode), context.opcode().Start);
}
_currentScope.Statements.Add(_currentInstruction);
_currentInstruction = null;
}
public void ShouldGenerateImpliedInstruction(CpuInstructions opcodeEnum, byte finalOpcode)
{
CpuInstructionStatement instruction = new CpuInstructionStatement();
instruction.AddressingMode = CpuAddressingMode.Implied;
instruction.Opcode = opcodeEnum;
List<CpuInstructionStatement> instructions = new List<CpuInstructionStatement>();
instructions.Add(instruction);
MemoryStream memoryStream = new MemoryStream(8);
CpuCodeGenerator generator = new CpuCodeGenerator(memoryStream);
generator.Instructions = instructions;
generator.Generate();
Assert.Equal(finalOpcode, memoryStream.GetBuffer()[0]);
}
