public object Run(params object[] parameters)
{
var envStack = new EnvironmentStack();
envStack.PushNew(); // Global env
envStack.Set(Symbol.fromString("sys:args"), new Variable(CliToVm(parameters)));
int ip = 0;
var valueStack = new ValueStack();
var callStack = new CallStack();
for (var current = Statements[ip]; !(current is EndStatement); current = Statements[ip])
{
//System.Diagnostics.Debug.Print("0x" + ip.ToString("x4") + ": " + current);
current.Execute(ref ip, valueStack, envStack, callStack);
}
if (envStack.Count() == 0) throw new exceptions.RuntimeException("Bad program: Global environment deleted!");
if (envStack.Count() > 1) throw new exceptions.RuntimeException("Bad program: Environment stack not cleaned up");
if (callStack.Count() > 1) throw new exceptions.RuntimeException("Bad program: Call stack not cleaned up");
if (valueStack.Count() == 0) throw new exceptions.RuntimeException("Bad program: Value stack empty after running");
if (valueStack.Count() > 1) throw new exceptions.RuntimeException("Bad program: Value stack not cleaned up");
return valueStack.Pop();
}
internal override void Execute(ref int ip, ValueStack valueStack, EnvironmentStack envStack, CallStack callStack)
{
envStack.Set(Symbol, new Variable());
ip += Length;
}
internal override void Execute(ref int ip, ValueStack valueStack, EnvironmentStack envStack, CallStack callStack)
{
object o = valueStack.Pop();
if (o is Variable) envStack.Set(Symbol, (Variable)o); // Link to variable, e.g. in Closure
else
{
if (envStack.HasVariable(Symbol))
envStack.Get(Symbol).SetValue(o);
else
envStack.Set(Symbol, new Variable(o));
}
ip += Length;
}
