public void writeInit()
{
string instructionsToWrite = AsmInstruction.bootstrapSP +
AsmInstruction.functionCall("Sys.init", 0, nextIntLabel);
outFile.Write(instructionsToWrite);
}
private void WriteArithmetic(string command)
{
switch (command)
{
case "add":
instructionsToWrite = AsmInstruction.stackAdd;
break;
case "sub":
instructionsToWrite = AsmInstruction.stackSubtract;
break;
case "neg":
instructionsToWrite = AsmInstruction.stackNegate;
break;
case "and":
instructionsToWrite = AsmInstruction.stackAnd;
break;
case "or":
instructionsToWrite = AsmInstruction.stackOr;
break;
case "not":
instructionsToWrite = AsmInstruction.stackNot;
break;
case "eq":
instructionsToWrite = AsmInstruction.stackEQ(nextIntLabel);
break;
case "gt":
instructionsToWrite = AsmInstruction.stackGT(nextIntLabel);
break;
case "lt":
instructionsToWrite = AsmInstruction.stackLT(nextIntLabel);
break;
default:
Console.Error.WriteLine("ERROR: CodeWriter.WriteArithmetic() called with unknown command");
instructionsToWrite = "Unknown arithmetic command: " + command + "\n";
break;
}
}
private void WritePushPop(CommandType command, string segment, int index)
{
if (command == CommandType.C_PUSH)
{
switch (segment)
{
case "constant":
instructionsToWrite = AsmInstruction.constToD(index);
break;
case "local":
instructionsToWrite = AsmInstruction.segmentMemValToD("LCL", index);
break;
case "argument":
instructionsToWrite = AsmInstruction.segmentMemValToD("ARG", index);
break;
case "this":
instructionsToWrite = AsmInstruction.segmentMemValToD("THIS", index);
break;
case "that":
instructionsToWrite = AsmInstruction.segmentMemValToD("THAT", index);
break;
case "pointer":
instructionsToWrite = AsmInstruction.memLocValToD(pointerBase + index);
break;
case "temp":
instructionsToWrite = AsmInstruction.memLocValToD(tempBase + index);
break;
case "static":
instructionsToWrite = AsmInstruction.staticLabelToD(staticPrefix + "." + index);
break;
default:
instructionsToWrite = "Push from invalid segment: " + segment + "\n";
break;
}
// finish by pushing the contents of D to the top of the stack
instructionsToWrite += AsmInstruction.pushFromD;
}
else if (command == CommandType.C_POP)
{
switch (segment)
{
case "constant":
instructionsToWrite = "Attempted to pop to segment constant\n";
break;
case "local":
instructionsToWrite = AsmInstruction.popToSegmentMemVal("LCL", index);
break;
case "argument":
instructionsToWrite = AsmInstruction.popToSegmentMemVal("ARG", index);
break;
case "this":
instructionsToWrite = AsmInstruction.popToSegmentMemVal("THIS", index);
break;
case "that":
instructionsToWrite = AsmInstruction.popToSegmentMemVal("THAT", index);
break;
case "pointer":
instructionsToWrite = AsmInstruction.popToMemLocVal(pointerBase + index);
break;
case "temp":
instructionsToWrite = AsmInstruction.popToMemLocVal(tempBase + index);
break;
case "static":
instructionsToWrite = AsmInstruction.popToStaticLabel(staticPrefix + "." + index);
break;
default:
instructionsToWrite = "Pop to invalid segment: " + segment + "\n";
break;
}
}
else
{
Console.Error.WriteLine("ERROR: CodeWriter.WritePushPop() called with non push/pop command type");
instructionsToWrite = "Unknown push/pop command: " + command + " " + segment + " " + index + "\n";
}
}
private void WriteCall(string funcName, int numArgs)
{
instructionsToWrite = AsmInstruction.functionCall(funcName, numArgs, nextIntLabel);
}
private void WriteFunctionHeader(string funcName, int numLocals)
{
instructionsToWrite = AsmInstruction.functionHeader(funcName, numLocals);
}
private void WriteIfGoto(string labelName)
{
instructionsToWrite = AsmInstruction.jumpNotZeroLabel(labelName);
}
private void WriteLabel(string labelName)
{
instructionsToWrite = AsmInstruction.writeLabel(labelName);
}