public virtual VerificationResult UnconditionalBranch(Label to)
{
// If we've recorded elsewhere that the label we're branching to *must* receive
// an empty stack, then inject a transition that expects that
if (MustBeEmptyWhenBranchedTo.Contains(to))
{
var trans = new LinqList <StackTransition>();
trans.Add(new StackTransition(sizeMustBe: 0));
var stackIsEmpty = Transition(new InstructionAndTransitions(null, null, trans));
if (stackIsEmpty != null)
{
return(stackIsEmpty);
}
}
var intoVerified = VerifyBranchInto(to);
if (intoVerified != null)
{
return(intoVerified);
}
UpdateRestores(to);
if (!RestoreOnMark.ContainsKey(to))
{
RestoreOnMark[to] = new LinqList <VerifiableTracker>();
RestoreStacksOnMark[to] = new LinqList <LinqStack <LinqList <TypeOnStack> > >();
}
if (!ExpectedStacksAtLabels.ContainsKey(to))
{
ExpectedStacksAtLabels[to] = new LinqList <SigilTuple <bool, LinqStack <LinqList <TypeOnStack> > > >();
}
ExpectedStacksAtLabels[to].Add(GetCurrentStack());
var verify = CheckStackMatches(to);
if (verify != null)
{
return(verify);
}
RestoreOnMark[to].AddRange(CurrentlyInScope);
RestoreStacksOnMark[to].AddRange(CurrentlyInScopeStacks);
EmptyCurrentScope();
MarkCreatesNewVerifier = true;
return(VerificationResult.Successful());
}
private ReturnTracerResult TraceFrom(int startAt, LinqList <Label> path, LinqHashSet <Label> pathLookup)
{
ReturnTracerResult cached;
if (Cache.TryGetValue(startAt, out cached))
{
return(cached);
}
var nextBranches = Branches.Where(b => b.Item3 >= startAt).GroupBy(g => g.Item3).OrderBy(x => x.Key).FirstOrDefault();
var orReturn = Returns.Where(ix => ix >= startAt && (nextBranches != null ? ix < nextBranches.Key : true)).Count();
var orThrow = Throws.Where(ix => ix >= startAt && (nextBranches != null ? ix < nextBranches.Key : true)).Count();
if (orReturn != 0)
{
Cache[startAt] = cached = ReturnTracerResult.Success();
return(cached);
}
if (orThrow != 0)
{
Cache[startAt] = cached = ReturnTracerResult.Success();
return(cached);
}
if (nextBranches == null)
{
Cache[startAt] = cached = ReturnTracerResult.Failure(path);
return(cached);
}
var ret = new LinqList <ReturnTracerResult>();
foreach (var nextBranch in nextBranches)
{
if (pathLookup.Contains(nextBranch.Item2))
{
Cache[startAt] = cached = ReturnTracerResult.Success();
ret.Add(cached);
continue;
}
var branchOp = nextBranch.Item1;
var branchTo = Marks[nextBranch.Item2];
var removeFromPathAt = path.Count;
path.Add(nextBranch.Item2);
pathLookup.Add(nextBranch.Item2);
var fromFollowingBranch = TraceFrom(branchTo, path, pathLookup);
path.RemoveAt(removeFromPathAt);
pathLookup.Remove(nextBranch.Item2);
if (IsUnconditionalBranch(branchOp))
{
Cache[startAt] = cached = fromFollowingBranch;
//return cached;
ret.Add(cached);
continue;
}
var fromFallingThrough = TraceFrom(startAt + 1, path, pathLookup);
Cache[startAt] = cached = ReturnTracerResult.Combo(fromFallingThrough, fromFollowingBranch);
ret.Add(cached);
}
Cache[startAt] = cached = ReturnTracerResult.Combo(ret.ToArray());
return(cached);
}
private static void UpdateStack(LinqStack <LinqList <TypeOnStack> > stack, InstructionAndTransitions wrapped, bool isBaseless)
{
var legal = wrapped.Transitions;
var instr = wrapped.Instruction;
var legalSize = 0;
legal.Each(
t =>
{
legalSize += t.PushedToStack.Length;
if (t.Before != null)
{
t.Before(stack, isBaseless);
}
}
);
if (legal.Any(l => LinqAlternative.Any(l.PoppedFromStack, u => u == TypeOnStack.Get <PopAllType>())))
{
if (instr.HasValue)
{
for (var i = 0; i < stack.Count; i++)
{
var ix = stack.Count - i - 1;
stack.ElementAt(i).Each(y => y.Mark(wrapped, ix));
}
}
stack.Clear();
}
else
{
var toPop = legal.First().PoppedCount;
for (var j = 0; j < toPop && stack.Count > 0; j++)
{
var popped = stack.Pop();
if (instr.HasValue)
{
var ix = toPop - j - 1;
popped.Each(y => y.Mark(wrapped, ix));
}
}
}
var toPush = new LinqList <TypeOnStack>(legalSize);
var pushed = new LinqHashSet <TypeOnStack>();
for (var i = 0; i < legal.Count; i++)
{
foreach (var p in legal[i].PushedToStack)
{
if (pushed.Contains(p))
{
continue;
}
toPush.Add(p);
pushed.Add(p);
}
}
if (toPush.Count > 0)
{
stack.Push(toPush);
}
}
