public void PopInnerLocal([NotNull] ZilAtom atom)
{
SpareLocals.Push(Locals[atom].LocalBuilder);
if (OuterLocals.TryGetValue(atom, out var stk))
{
Locals[atom] = stk.Pop();
if (stk.Count == 0)
{
OuterLocals.Remove(atom);
}
}
else
{
Locals.Remove(atom);
}
}
public ILocalBuilder PushInnerLocal([NotNull] IRoutineBuilder rb, [NotNull] ZilAtom atom,
LocalBindingType reason, ISourceLine src)
{
if (Locals.TryGetValue(atom, out var prev))
{
// save the old binding
if (OuterLocals.TryGetValue(atom, out var stk) == false)
{
stk = new Stack <LocalBindingRecord>();
OuterLocals.Add(atom, stk);
}
stk.Push(prev);
}
ILocalBuilder result;
if (SpareLocals.Count > 0)
{
// reuse a spare variable
result = SpareLocals.Pop();
}
else
{
// allocate a new variable with a unique name
var tempName = MakeUniqueVariableName(atom);
try
{
result = rb.DefineLocal(tempName.Text);
}
catch (InvalidOperationException)
{
throw new CompilerError(CompilerMessages.Expression_Needs_Temporary_Variables_Not_Allowed_Here);
}
TempLocalNames.Add(tempName);
}
var lbr = new LocalBindingRecord(reason, src, atom.Text, result);
Locals[atom] = lbr;
AllLocalBindingRecords.Add(lbr);
return(result);
}