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)
{
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);
}
}
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 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");
}
private static void releaseRegister(Scope scope, int reg)
{
scope.FreeMaybeRegister(reg);
if (reg == (int)Register.STACK) 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);
}
}
}
}
