public void ResolveLabels_Creates_Unknown_Instruction_If_Label_Is_Defined_Twice()
{
// arrange
IDictionary<string, int> symbolTable = new Dictionary<string, int>();
IInstruction[] instructions =
{
new VariableInstruction("i"),
new ComputeInstruction(ComputeDestinationType.Memory, "1"),
new VariableInstruction("R2"),
new ComputeInstruction(ComputeDestinationType.Memory, "0"),
new LabelInstruction("LOOP"),
new VariableInstruction("i"),
new ComputeInstruction(ComputeDestinationType.DataRegister, "M"),
new VariableInstruction("R0"),
new ComputeInstruction(ComputeDestinationType.DataRegister, "D-M"),
new LabelInstruction("LOOP"),
new ComputeInstruction(ComputeDestinationType.None, "0", ComputeJumpType.JMP),
new VariableInstruction("LOOP"),
new ComputeInstruction(ComputeDestinationType.None, "0", ComputeJumpType.JMP),
};
var labelResolver = new HackLabelResolver(new IsLabelVisitor());
// act
IEnumerable<IInstruction> resolvedInstructions = labelResolver.ResolveLabels(symbolTable, instructions);
// assert
Assert.AreEqual(1, resolvedInstructions.Count(i => i is UnknownInstruction));
}
public void ResolveLabels_Adds_Label_To_Symbol_Table()
{
// arrange
IDictionary<string, int> symbolTable = new Dictionary<string, int>();
IInstruction[] instructions =
{
new VariableInstruction("i"),
new ComputeInstruction(ComputeDestinationType.Memory, "1"),
new VariableInstruction("R2"),
new ComputeInstruction(ComputeDestinationType.Memory, "0"),
new LabelInstruction("LOOP"),
new VariableInstruction("i"),
new ComputeInstruction(ComputeDestinationType.DataRegister, "M"),
new VariableInstruction("R0"),
new ComputeInstruction(ComputeDestinationType.DataRegister, "D-M"),
new VariableInstruction("END"),
new ComputeInstruction(ComputeDestinationType.None, "D", ComputeJumpType.JGT),
new VariableInstruction("R1"),
new ComputeInstruction(ComputeDestinationType.DataRegister, "M"),
new VariableInstruction("R2"),
new ComputeInstruction(ComputeDestinationType.Memory, "M+D"),
new VariableInstruction("i"),
new ComputeInstruction(ComputeDestinationType.Memory, "M+1"),
new VariableInstruction("LOOP"),
new ComputeInstruction(ComputeDestinationType.None, "0", ComputeJumpType.JMP),
new LabelInstruction("END"),
new VariableInstruction("END"),
new ComputeInstruction(ComputeDestinationType.None, "0", ComputeJumpType.JMP),
}; // mult program - first thing I wrote in assembly language
var labelResolver = new HackLabelResolver(new IsLabelVisitor());
// act
labelResolver.ResolveLabels(symbolTable, instructions).ToArray();
// assert
Assert.AreEqual(2, symbolTable.Count);
Assert.AreEqual(4, symbolTable["LOOP"]);
Assert.AreEqual(18, symbolTable["END"]);
}