public override void Compile(Assembly assembly, Scope scope, Register target)
{
throw new CompileError("Comparisons in general expressions are not implemented");
//Evaluate in reverse in case both need to go on the stack
var secondTarget = scope.FindFreeRegister();
if (Scope.IsRegister((Register)secondTarget)) scope.UseRegister(secondTarget);
(ChildNodes[1] as CompilableNode).Compile(assembly, scope, (Register)secondTarget);
if (AsString == "==" || AsString == "!=")
{
(ChildNodes[0] as CompilableNode).Compile(assembly, scope, Register.STACK);
if (target == Register.STACK)
{
assembly.Add("SET", Scope.TempRegister, "0x0", "Equality onto stack");
assembly.Add((AsString == "==" ? "IFE" : "IFN"), "POP", Scope.GetRegisterLabelSecond(secondTarget));
assembly.Add("SET", Scope.TempRegister, "0x1");
assembly.Add("SET", "PUSH", Scope.TempRegister);
}
else
{
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), "0x0", "Equality into register");
assembly.Add((AsString == "==" ? "IFE" : "IFN"), "POP", Scope.GetRegisterLabelSecond(secondTarget));
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), "0x1");
}
}
if (secondTarget == (int)Register.STACK)
scope.stackDepth -= 1;
else
scope.FreeRegister(secondTarget);
}
public static void CompileRoot(FunctionDeclarationNode root, Assembly assembly, Action<string> onError)
{
DCPUC.Scope.Reset();
var scope = new DCPUC.Scope();
var end_of_program = new Variable();
end_of_program.location = Register.STATIC;
end_of_program.name = "__endofprogram";
end_of_program.staticLabel = "ENDOFPROGRAM";
end_of_program.emitBrackets = false;
scope.variables.Add(end_of_program);
var library = new List<String>(System.IO.File.ReadAllLines("libdcpuc.txt"));
//root.InsertLibrary(library);
try
{
root.CompileFunction(assembly, scope);
foreach (var dataItem in DCPUC.Scope.dataElements)
{
var datString = "";
foreach (var item in dataItem.Item2)
{
datString += item;
datString += ", ";
}
assembly.Add(":" + dataItem.Item1, "DAT", datString.Substring(0, datString.Length - 2));
}
assembly.Add(":ENDOFPROGRAM", "", "");
}
catch (DCPUC.CompileError c)
{
onError(c.Message);
return;
}
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
var topLabel = Scope.GetLabel() + "BEGIN_WHILE";
assembly.Add(":" + topLabel, "", "");
var clauseOrder = CompileConditional(assembly, scope, ChildNodes[0] as CompilableNode);
if (clauseOrder == ClauseOrder.ConstantPass)
{
CompileBlock(assembly, scope, ChildNodes[1] as CompilableNode);
assembly.Add("SET", "PC", topLabel);
}
else if (clauseOrder == ClauseOrder.ConstantFail)
{
}
else if (clauseOrder == ClauseOrder.PassFirst)
{
var endLabel = Scope.GetLabel() + "END";
assembly.Add("SET", "PC", endLabel);
CompileBlock(assembly, scope, ChildNodes[1] as CompilableNode);
assembly.Add("SET", "PC", topLabel);
assembly.Add(":" + endLabel, "", "");
}
else if (clauseOrder == ClauseOrder.FailFirst)
{
var elseLabel = Scope.GetLabel() + "ELSE";
var endLabel = Scope.GetLabel() + "END";
assembly.Add("SET", "PC", elseLabel);
assembly.Add("SET", "PC", endLabel);
assembly.Add(":" + elseLabel, "", "");
CompileBlock(assembly, scope, ChildNodes[1] as CompilableNode);
assembly.Add("SET", "PC", topLabel);
assembly.Add(":" + endLabel, "", "");
}
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
var lines = AsString.Split(new String[2]{"\n", "\r"}, StringSplitOptions.RemoveEmptyEntries);
assembly.Barrier();
foreach (var str in lines)
assembly.Add(str + " ;", "", "");
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
var variable = scope.FindVariable(AsString);
if (variable == null) throw new CompileError("Could not find variable " + AsString);
if (variable.location == Register.CONST)
{
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), variable.staticLabel);
}
else if (variable.location == Register.STATIC)
{
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), "[" + variable.staticLabel + "]");
}
else if (variable.location == Register.STACK)
{
if (scope.stackDepth - variable.stackOffset > 1)
{
assembly.Add("SET", Scope.TempRegister, "SP");
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), "[" + hex(scope.stackDepth - variable.stackOffset - 1) + "+" + Scope.TempRegister + "]", "Fetching variable");
}
else
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), "PEEK", "Fetching variable");
}
else
{
if (target == variable.location) return;
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), Scope.GetRegisterLabelSecond((int)variable.location), "Fetching variable");
}
if (target == Register.STACK) scope.stackDepth += 1;
}
public static void CompileBlock(Assembly assembly, Scope scope, CompilableNode block)
{
var blockScope = BeginBlock(scope);
assembly.Barrier();
block.Compile(assembly, blockScope, Register.DISCARD);
assembly.Barrier();
EndBlock(assembly, blockScope);
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
foreach (var child in ChildNodes)
{
assembly.Barrier();
(child as CompilableNode).Compile(assembly, scope, Register.DISCARD);
}
}
public override void CompileFunction(Assembly assembly, Scope topscope)
{
//if (references == 0) return;
foreach (var line in code)
{
assembly.Barrier();
assembly.Add(line, "", "");
}
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
var reg = scope.FindAndUseFreeRegister();
(ChildNodes[0] as CompilableNode).Compile(assembly, scope, (Register)reg);
if (reg != (int)Register.A) assembly.Add("SET", "A", Scope.GetRegisterLabelSecond(reg));
scope.FreeMaybeRegister(reg);
if (reg == (int)Register.STACK) scope.stackDepth -= 1;
if (scope.activeFunction != null) scope.activeFunction.CompileReturn(assembly, scope);
else assembly.Add("BRK", "", "");
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
//if (data.Count == 1)
// assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), hex(data[0]));
//else
//{
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), dataLabel);
Scope.AddData(dataLabel, data);
//}
if (target == Register.STACK) scope.stackDepth += 1;
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
int secondTarget = (int)Register.STACK;
var secondConstant = (ChildNodes[1] as CompilableNode).IsConstant();
var firstConstant = (ChildNodes[0] as CompilableNode).IsConstant();
if (firstConstant && secondConstant)
{
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), hex(GetConstantValue()));
if (target == Register.STACK) scope.stackDepth += 1;
return;
}
if (!secondConstant)
{
secondTarget = scope.FindAndUseFreeRegister();
(ChildNodes[1] as CompilableNode).Compile(assembly, scope, (Register)secondTarget);
}
if (!firstConstant)
(ChildNodes[0] as CompilableNode).Compile(assembly, scope, target);
if (target == Register.STACK)
{
assembly.Add("SET", Scope.TempRegister,
firstConstant ? hex((ChildNodes[0] as CompilableNode).GetConstantValue()) : "POP");
assembly.Add(opcodes[AsString], Scope.TempRegister,
secondConstant ? hex((ChildNodes[1] as CompilableNode).GetConstantValue()) : Scope.GetRegisterLabelSecond(secondTarget));
assembly.Add("SET", "PUSH", Scope.TempRegister);
}
else
{
if (firstConstant)
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), hex((ChildNodes[0] as CompilableNode).GetConstantValue()));
assembly.Add(opcodes[AsString], Scope.GetRegisterLabelFirst((int)target),
secondConstant ? hex((ChildNodes[1] as CompilableNode).GetConstantValue()) : Scope.GetRegisterLabelSecond(secondTarget));
}
if (secondTarget == (int)Register.STACK && !secondConstant)
scope.stackDepth -= 1;
else
scope.FreeMaybeRegister(secondTarget);
}
public virtual void CompileFunction(Assembly assembly, Scope topscope)
{
Scope lScope;
if (localScope != null)
{
foreach (var variable in topscope.variables)
if (variable.location == Register.STATIC)
localScope.variables.Add(variable);
lScope = localScope.Push(new Scope());
assembly.Add(":" + label, "", "");
}
else
lScope = topscope;
assembly.Barrier();
if (localScope != null) lScope.stackDepth += 1; //account for return address
(ChildNodes[0] as CompilableNode).Compile(assembly, lScope, Register.DISCARD);
if (localScope != null) CompileReturn(assembly, lScope);
else assembly.Add("BRK", "", "");
assembly.Barrier();
//Should leave the return value, if any, in A.
foreach (var function in lScope.pendingFunctions)
function.CompileFunction(assembly, topscope);
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
var destRegister = target == Register.STACK ? scope.FindAndUseFreeRegister() : (int)target;
(ChildNodes[0] as CompilableNode).Compile(assembly, scope, (Register)destRegister);
if (target == Register.STACK)
{
if (destRegister == (int)Register.STACK)
assembly.Add("SET", "PEEK", "[PEEK]");
else
{
assembly.Add("SET", "PUSH", "[" + Scope.GetRegisterLabelSecond(destRegister) + "]");
scope.stackDepth += 1;
scope.FreeMaybeRegister(destRegister);
}
}
else
{
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), "[" + Scope.GetRegisterLabelSecond(destRegister) + "]");
if (destRegister == (int)Register.STACK)
scope.stackDepth -= 1;
else if (destRegister != (int)target)
scope.FreeMaybeRegister(destRegister);
}
}
internal void CompileReturn(Assembly assembly, Scope lScope)
{
if (lScope.stackDepth - localScope.stackDepth > 1)
assembly.Add("ADD", "SP", hex(lScope.stackDepth - localScope.stackDepth - 1), "Cleanup stack");
assembly.Add("SET", "PC", "POP", "Return");
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
scope.pendingFunctions.Add(this);
}
public virtual void Compile(Assembly assembly, Scope scope, Register target)
{
throw new NotImplementedException();
}
public static void EndBlock(Assembly assembly, Scope scope)
{
if (scope.stackDepth - scope.parentDepth > 0)
assembly.Add("ADD", "SP", hex(scope.stackDepth - scope.parentDepth), "End block");
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
var newVariable = new Variable();
newVariable.name = AsString;
newVariable.scope = scope;
newVariable.stackOffset = scope.stackDepth;
if (declLabel == "var")
{
newVariable.location = (Register)scope.FindAndUseFreeRegister();
if (newVariable.location == Register.I) newVariable.location = Register.STACK;
if (ChildNodes[0] is BlockLiteralNode)
{
var size = Child(0).GetConstantValue();
scope.stackDepth += size;
assembly.Add("SUB", "SP", hex(size));
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)newVariable.location), "SP");
if (newVariable.location == Register.STACK) scope.stackDepth += 1;
}
else
(ChildNodes[0] as CompilableNode).Compile(assembly, scope, newVariable.location);
}
else if (declLabel == "static")
{
newVariable.location = Register.STATIC;
if (Child(0) is BlockLiteralNode)
{
newVariable.staticLabel = Scope.GetLabel() + "_STATIC_" + AsString;
var datLabel = Scope.GetLabel() + "_STATIC_" + AsString + "_DATA";
Scope.AddData(datLabel, (ChildNodes[0] as BlockLiteralNode).MakeData());
Scope.AddData(newVariable.staticLabel, datLabel);
}
else if ((ChildNodes[0] as CompilableNode).IsConstant())
{
newVariable.staticLabel = Scope.GetLabel() + "_STATIC_" + AsString;
Scope.AddData(newVariable.staticLabel, new List<ushort>(new ushort[] { (ChildNodes[0] as CompilableNode).GetConstantValue() }));
}
else if (ChildNodes[0] is DataLiteralNode)
{
newVariable.staticLabel = Scope.GetLabel() + "_STATIC_" + AsString;
var datLabel = Scope.GetLabel() + "_STATIC_" + AsString + "_DATA";
Scope.AddData(datLabel, (ChildNodes[0] as DataLiteralNode).data);
Scope.AddData(newVariable.staticLabel, datLabel);
}
else
throw new CompileError("Statics must be initialized to a constant value");
}
else if (declLabel == "const")
{
newVariable.location = Register.CONST;
if (Child(0) is BlockLiteralNode)
{
newVariable.staticLabel = Scope.GetLabel() + "_STATIC_" + AsString;
Scope.AddData(newVariable.staticLabel, (ChildNodes[0] as BlockLiteralNode).MakeData());
}
else if ((ChildNodes[0] as CompilableNode).IsConstant())
{
//throw new CompileError("Initializing const to integrals is not supported yet");
newVariable.staticLabel = (ChildNodes[0] as CompilableNode).GetConstantToken();
//Scope.AddData(newVariable.staticLabel, (ChildNodes[0] as CompilableNode).GetConstantToken());
}
else if (ChildNodes[0] is DataLiteralNode)
{
newVariable.staticLabel = Scope.GetLabel() + "_STATIC_" + AsString;
Scope.AddData(newVariable.staticLabel, (ChildNodes[0] as DataLiteralNode).data);
}
}
scope.variables.Add(newVariable);
//scope.stackDepth += 1;
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
throw new CompileError("Should never reach this.");
}
private static void PushRegister(Assembly assembly, Scope scope, Register r)
{
assembly.Add("SET", "PUSH", Scope.GetRegisterLabelSecond((int)r), "Saving register");
scope.FreeRegister(0);
scope.stackDepth += 1;
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
if (ChildNodes[0] is VariableNameNode)
{
var variable = scope.FindVariable(ChildNodes[0].AsString);
if (variable == null) throw new CompileError("Could not find variable " + ChildNodes[0].AsString);
if (variable.location == Register.STACK)
{
var register = scope.FindAndUseFreeRegister();
(ChildNodes[1] as CompilableNode).Compile(assembly, scope, (Register)register);
scope.FreeMaybeRegister(register);
if (scope.stackDepth - variable.stackOffset > 1)
{
assembly.Add("SET", Scope.TempRegister, "SP");
assembly.Add("SET", "[" + hex(scope.stackDepth - variable.stackOffset - 1) + "+" + Scope.TempRegister + "]",
Scope.GetRegisterLabelSecond(register), "Fetching variable");
}
else
assembly.Add("SET", "PEEK", Scope.GetRegisterLabelSecond(register), "Fetching variable");
if (register == (int)Register.STACK) scope.stackDepth -= 1;
}
else if (variable.location == Register.STATIC)
{
//if (!variable.emitBrackets) throw new CompileError("Can't assign to data pointers!");
var register = scope.FindAndUseFreeRegister();
(ChildNodes[1] as CompilableNode).Compile(assembly, scope, (Register)register);
scope.FreeMaybeRegister(register);
assembly.Add("SET", "[" + variable.staticLabel + "]", Scope.GetRegisterLabelSecond(register));
if (register == (int)Register.STACK) scope.stackDepth -= 1;
}
else if (variable.location == Register.CONST)
{
throw new CompileError("Can't assign to const");
}
else
(ChildNodes[1] as CompilableNode).Compile(assembly, scope, variable.location);
}
else if (ChildNodes[0] is DereferenceNode)
{
bool firstConstant = false;
int firstRegister = (int)Register.STACK;
if ((ChildNodes[0].ChildNodes[0] as CompilableNode).IsConstant())
firstConstant = true;
else
{
firstRegister = scope.FindAndUseFreeRegister();
(ChildNodes[0].ChildNodes[0] as CompilableNode).Compile(assembly, scope, (Register)firstRegister);
}
var secondRegister = scope.FindAndUseFreeRegister();
(ChildNodes[1] as CompilableNode).Compile(assembly, scope, (Register)secondRegister);
if (firstConstant)
{
assembly.Add("SET", "[" + hex((ChildNodes[0].ChildNodes[0] as CompilableNode).GetConstantValue()) + "]",
Scope.GetRegisterLabelSecond(secondRegister));
if (secondRegister == (int)Register.STACK)
scope.stackDepth -= 1;
else
scope.FreeMaybeRegister(secondRegister);
}
else
{
if (firstRegister == (int)Register.STACK && secondRegister == (int)Register.STACK)
{
assembly.Add("SET", Scope.TempRegister, "POP");
assembly.Add("SET", "[" + Scope.TempRegister + "]", "POP");
scope.stackDepth -= 2;
}
else if (secondRegister == (int)Register.STACK)
{
assembly.Add("SET", "[" + Scope.GetRegisterLabelFirst(firstRegister) + "]", "POP");
scope.stackDepth -= 1;
scope.FreeMaybeRegister(firstRegister);
return;
}
else if (firstRegister == (int)Register.STACK)
{
throw new CompileError("Impossible situation entered");
}
else
{
assembly.Add("SET", "[" + Scope.GetRegisterLabelFirst(firstRegister) + "]", Scope.GetRegisterLabelSecond(secondRegister));
scope.FreeMaybeRegister(firstRegister);
scope.FreeMaybeRegister(secondRegister);
}
}
}
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
var func = findFunction(this, AsString);
if (func == null) throw new CompileError("Can't find function - " + AsString);
if (func.parameterCount != ChildNodes.Count) throw new CompileError("Incorrect number of arguments - " + AsString);
func.references += 1;
//Marshall registers
var startingRegisterState = scope.SaveRegisterState();
for (int i = 0; i < 3; ++i)
{
if (startingRegisterState[i] == RegisterState.Used)
{
PushRegister(assembly, scope, (Register)i);
if (scope.activeFunction != null && scope.activeFunction.parameterCount > i)
{
scope.activeFunction.localScope.variables[i].location = Register.STACK;
scope.activeFunction.localScope.variables[i].stackOffset = scope.stackDepth - 1;
}
}
if (func.parameterCount > i)
{
scope.UseRegister(i);
(ChildNodes[i] as CompilableNode).Compile(assembly, scope, (Register)i);
}
}
for (int i = 3; i < 7; ++i)
if (startingRegisterState[i] == RegisterState.Used)
PushRegister(assembly, scope, (Register)i);
if (func.parameterCount > 3)
for (int i = 3; i < func.parameterCount; ++i)
(ChildNodes[i] as CompilableNode).Compile(assembly, scope, Register.STACK);
assembly.Add("JSR", func.label, "", "Calling function");
if (func.parameterCount > 3) //Need to remove parameters from stack
{
assembly.Add("ADD", "SP", hex(func.parameterCount - 3), "Remove parameters");
scope.stackDepth -= (func.parameterCount - 3);
}
if (scope.activeFunction != null)
for (int i = 0; i < 3 && i < scope.activeFunction.parameterCount; ++i)
scope.activeFunction.localScope.variables[i].location = (Register)i;
var saveA = startingRegisterState[0] == RegisterState.Used;
if (saveA && target != Register.DISCARD) assembly.Add("SET", Scope.TempRegister, "A", "Save return value from being overwritten by stored register");
for (int i = 6; i >= 0; --i)
{
if (startingRegisterState[i] == RegisterState.Used)
{
assembly.Add("SET", Scope.GetRegisterLabelFirst(i), "POP", "Restoring register");
scope.UseRegister(i);
scope.stackDepth -= 1;
}
}
if (target == Register.A && !saveA) return;
else if (Scope.IsRegister(target)) assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), saveA ? Scope.TempRegister : "A");
else if (target == Register.STACK)
{
assembly.Add("SET", "PUSH", saveA ? Scope.TempRegister : "A", "Put return value on stack");
scope.stackDepth += 1;
}
}
public override void Compile(Assembly assembly, Scope scope, Register target)
{
assembly.Add("SET", Scope.GetRegisterLabelFirst((int)target), hex(Value));
if (target == Register.STACK) scope.stackDepth += 1;
}
public static ClauseOrder CompileConditional(Assembly assembly, Scope scope, CompilableNode conditionNode)
{
if (!(conditionNode is ComparisonNode))
{
var condTarget = scope.FindAndUseFreeRegister();
conditionNode.Compile(assembly, scope, (Register)condTarget);
assembly.Add("IFE", Scope.GetRegisterLabelSecond(condTarget), "0x0", "If from expression");
scope.FreeMaybeRegister(condTarget);
return ClauseOrder.PassFirst;
}
else
{
var op = conditionNode.AsString;
ushort firstConstantValue = 0, secondConstantValue = 0;
var firstIsConstant = (conditionNode.ChildNodes[0] as CompilableNode).IsConstant();
var secondIsConstant = (conditionNode.ChildNodes[1] as CompilableNode).IsConstant();
int firstRegister = (int)Register.STACK;
int secondRegister = (int)Register.STACK;
if (secondIsConstant)
secondConstantValue = (conditionNode.ChildNodes[1] as CompilableNode).GetConstantValue();
else
{
secondRegister = scope.FindAndUseFreeRegister();
(conditionNode.ChildNodes[1] as CompilableNode).Compile(assembly, scope, (Register)secondRegister);
}
if (firstIsConstant)
firstConstantValue = (conditionNode.ChildNodes[0] as CompilableNode).GetConstantValue();
else
{
firstRegister = scope.FindAndUseFreeRegister();
(conditionNode.ChildNodes[0] as CompilableNode).Compile(assembly, scope, (Register)firstRegister);
}
if (op == "==")
{
if (firstIsConstant && secondIsConstant)
{
if (firstConstantValue == secondConstantValue) { return ClauseOrder.ConstantPass; }
else { return ClauseOrder.ConstantFail; }
}
else if (firstIsConstant)
{
assembly.Add("IFE", (conditionNode.ChildNodes[0] as CompilableNode).GetConstantToken(), Scope.GetRegisterLabelSecond(secondRegister));
releaseRegister(scope, secondRegister);
return ClauseOrder.FailFirst;
}
else if (secondIsConstant)
{
assembly.Add("IFE", Scope.GetRegisterLabelSecond(firstRegister), hex(secondConstantValue));
releaseRegister(scope, firstRegister);
return ClauseOrder.FailFirst;
}
else
{
assembly.Add("IFE", Scope.GetRegisterLabelSecond(firstRegister), Scope.GetRegisterLabelSecond(secondRegister));
releaseRegister(scope, firstRegister);
releaseRegister(scope, secondRegister);
return ClauseOrder.FailFirst;
}
}
else if (op == "!=")
{
if (firstIsConstant && secondIsConstant)
{
if (firstConstantValue != secondConstantValue) { return ClauseOrder.ConstantPass; }
else { return ClauseOrder.ConstantFail; }
}
else if (firstIsConstant)
{
assembly.Add("IFN", hex(firstConstantValue), Scope.GetRegisterLabelSecond(secondRegister));
releaseRegister(scope, secondRegister);
return ClauseOrder.FailFirst;
}
else if (secondIsConstant)
{
assembly.Add("IFN", Scope.GetRegisterLabelSecond(firstRegister), hex(secondConstantValue));
releaseRegister(scope, firstRegister);
return ClauseOrder.FailFirst;
}
else
{
assembly.Add("IFN", Scope.GetRegisterLabelSecond(firstRegister), Scope.GetRegisterLabelSecond(secondRegister));
releaseRegister(scope, firstRegister);
releaseRegister(scope, secondRegister);
return ClauseOrder.FailFirst;
}
}
else if (op == ">")
{
if (firstIsConstant && secondIsConstant)
{
if (firstConstantValue > secondConstantValue) { return ClauseOrder.ConstantPass; }
else { return ClauseOrder.ConstantFail; }
}
else if (firstIsConstant)
{
assembly.Add("IFG", hex(firstConstantValue), Scope.GetRegisterLabelSecond(secondRegister));
releaseRegister(scope, secondRegister);
return ClauseOrder.FailFirst;
}
else if (secondIsConstant)
{
assembly.Add("IFG", Scope.GetRegisterLabelSecond(firstRegister), hex(secondConstantValue));
releaseRegister(scope, firstRegister);
return ClauseOrder.FailFirst;
}
else
{
assembly.Add("IFG", Scope.GetRegisterLabelSecond(firstRegister), Scope.GetRegisterLabelSecond(secondRegister));
releaseRegister(scope, firstRegister);
releaseRegister(scope, secondRegister);
return ClauseOrder.FailFirst;
}
}
}
throw new CompileError("Impossible situation reached");
}