public void CreateBorrowAndTerminateLifetimeNodes(LifetimeVariableAssociation lifetimeVariableAssociation)
{
if (_borrowRequired)
{
Node parentNode = _facades.First().Terminal.ParentNode;
BorrowMode borrowMode = _mutableBorrow ? BorrowMode.Mutable : BorrowMode.Immutable;
int borrowInputCount = _facades.Count;
Diagram inputParentDiagram = _facades.First().Terminal.ParentDiagram;
var explicitBorrow = new ExplicitBorrowNode(inputParentDiagram, borrowMode, borrowInputCount, true, false);
AutoBorrowNodeFacade borrowNodeFacade = AutoBorrowNodeFacade.GetNodeFacade(explicitBorrow);
foreach (var terminal in explicitBorrow.Terminals)
{
borrowNodeFacade[terminal] = new SimpleTerminalFacade(terminal, default(TypeVariableReference));
}
int index = 0;
foreach (var facade in _facades)
{
Terminal input = facade.Terminal;
VariableReference ownerVariable = input.GetFacadeVariable(), borrowVariable;
((AutoborrowingInputTerminalFacade)facade).AddPostBorrowCoercion(ref input, out borrowVariable);
InsertBorrowAheadOfTerminal(input, explicitBorrow, index, ownerVariable, borrowVariable);
++index;
}
List <TerminateLifetimeOutputTerminalFacade> terminates = new List <TerminateLifetimeOutputTerminalFacade>();
foreach (var terminal in parentNode.OutputTerminals)
{
var terminateFacade = _nodeFacade[terminal] as TerminateLifetimeOutputTerminalFacade;
if (terminateFacade != null && _facades.Contains(terminateFacade.InputFacade))
{
terminates.Add(terminateFacade);
}
}
if (terminates.Count == borrowInputCount)
{
Diagram outputParentDiagram = terminates.First().Terminal.ParentDiagram;
var terminateLifetime = CreateNodeFacadesHelpers.CreateTerminateLifetimeWithFacades(outputParentDiagram, borrowInputCount, borrowInputCount);
index = 0;
foreach (var terminate in terminates)
{
InsertTerminateLifetimeBehindTerminal(terminate.Terminal, terminateLifetime, index, lifetimeVariableAssociation);
++index;
}
}
else if (terminates.Count > 0)
{
throw new InvalidOperationException("Mismatched terminates and borrows; not sure what to do");
}
}
}
public void Execute(DfirRoot dfirRoot, CompileCancellationToken cancellationToken)
{
var lifetimeGraphTree = dfirRoot.GetLifetimeGraphTree();
BoundedLifetimeLiveVariableSet boundedLifetimeLiveVariableSet;
while (_lifetimeVariableAssociation.TryGetBoundedLifetimeWithLiveVariables(out boundedLifetimeLiveVariableSet))
{
if (lifetimeGraphTree.IsDiagramLifetimeOfAnyLifetimeGraph(boundedLifetimeLiveVariableSet.Lifetime))
{
// Since we assume there are no semantic errors at this point, just mark any remaining live variables
// in a diagram lifetime as consumed.
boundedLifetimeLiveVariableSet.LiveVariables.Select(l => l.Variable).ForEach(_lifetimeVariableAssociation.MarkVariableConsumed);
continue;
}
int inputVariableCount = boundedLifetimeLiveVariableSet.LiveVariables.Count();
IEnumerable <VariableReference> interruptedVariables = _lifetimeVariableAssociation.GetVariablesInterruptedByLifetime(boundedLifetimeLiveVariableSet.Lifetime);
int outputVariableCount = interruptedVariables.Count();
Diagram startSearch = boundedLifetimeLiveVariableSet.LiveVariables.First().Terminal.ParentDiagram;
LifetimeGraphIdentifier originGraphIdentifier = lifetimeGraphTree.GetBoundedLifetimeGraphIdentifier(boundedLifetimeLiveVariableSet.Lifetime);
Diagram originDiagram = originGraphIdentifier.FindDiagramForGraphIdentifier(startSearch);
LiveVariable[] liveVariables = boundedLifetimeLiveVariableSet.LiveVariables.ToArray();
for (int i = 0; i < liveVariables.Length; ++i)
{
LiveVariable liveVariable = liveVariables[i];
while (liveVariable.Terminal.ParentDiagram != originDiagram)
{
liveVariable = PullLiveVariableUpToNextHigherDiagram(liveVariable);
}
liveVariables[i] = liveVariable;
}
TerminateLifetimeNode terminateLifetime = CreateNodeFacadesHelpers.CreateTerminateLifetimeWithFacades(originDiagram, inputVariableCount, outputVariableCount);
foreach (var pair in liveVariables.Zip(terminateLifetime.InputTerminals))
{
// TODO: maybe assert that liveVariable.Terminal is unwired here?
LiveVariable liveVariable = pair.Key;
Terminal terminateLifetimeInputTerminal = pair.Value;
liveVariable.ConnectToTerminalAsInputAndUnifyVariables(terminateLifetimeInputTerminal, _unificationResultFactory);
_lifetimeVariableAssociation.MarkVariableConsumed(liveVariable.Variable);
}
foreach (var pair in interruptedVariables.Zip(terminateLifetime.OutputTerminals))
{
VariableReference interruptedVariable = pair.Key;
Terminal terminateLifetimeOutputTerminal = pair.Value;
terminateLifetimeOutputTerminal.GetFacadeVariable().MergeInto(interruptedVariable);
_lifetimeVariableAssociation.MarkVariableLive(interruptedVariable, terminateLifetimeOutputTerminal);
}
}
}