/// <summary>
/// Changes the execution context to the current environment's parent, and then jumps to the
/// address on the ReturnAddress stack. In other words, this explicitly closes dynamic scope.
/// </summary>
/// <param name="vm"></param>
/// <param name="i"></param>
internal static void Return(VirtualMachine vm, Instruction i)
{
if (vm.CurrentEnvironment.Parent == null) {
// We're at the top of the chain, so end execution.
vm.RaiseError("Attempted to return without any parent environment.");
return;
}
if (vm.Stack.Count() > 0) {
Value val = vm.Stack.Shift();
vm.CurrentEnvironment.Parent.Stack.Push(val);
}
vm.PopCurrentEnvironment();
vm.ByteCode.ProgramCounter = vm.ReturnAddresses[vm.ReturnAddresses.Count() - 1];
// Pop off this return address
vm.ReturnAddresses.RemoveAt(vm.ReturnAddresses.Count() - 1);
// Pop off the CodeBlock saved for this function
vm.FunctionCallList.RemoveAt(vm.FunctionCallList.Count() - 1);
}