public virtual void VisitCFGForeachMoveNextEdge(ForeachMoveNextEdge x)
{
Accept(x.ValueVariable);
Accept(x.KeyVariable);
x.BodyBlock.Accept(this);
x.NextBlock.Accept(this);
}
public override object VisitCFGForeachMoveNextEdge(ForeachMoveNextEdge x)
{
return(x.Update(
(BoundBlock)Accept(x.BodyBlock),
(BoundBlock)Accept(x.NextBlock),
x.EnumereeEdge, // It updates this reference in its visit instead
(BoundReferenceExpression)Accept(x.KeyVariable),
(BoundReferenceExpression)Accept(x.ValueVariable),
x.MoveSpan));
}
public override void VisitForeachStmt(ForeachStmt x)
{
// binds enumeree expression & connect pre-enumeree-expr blocks
var boundEnumereeBag = _binder.BindWholeExpression(x.Enumeree, BoundAccess.Read);
ConnectBoundItemsBagBlocksToCurrentBlock(boundEnumereeBag);
var end = NewBlock();
var move = NewBlock();
var body = NewBlock();
// _current -> move -> body -> move -> ...
// ForeachEnumereeEdge : SimpleEdge
// x.Enumeree.GetEnumerator();
var enumereeEdge = new ForeachEnumereeEdge(_current, move, boundEnumereeBag.BoundElement, x.ValueVariable.Alias);
// ContinueTarget:
OpenBreakScope(end, move);
// bind reference expression for foreach key variable
BoundReferenceExpression keyVar = (x.KeyVariable != null) ?
(BoundReferenceExpression)_binder.BindWholeExpression(x.KeyVariable.Variable, BoundAccess.Write).GetOnlyBoundElement()
: null;
// bind reference expression for foreach value variable
var valueVar = (BoundReferenceExpression)(_binder.BindWholeExpression(
(Expression)x.ValueVariable.Variable ?? x.ValueVariable.List,
x.ValueVariable.Alias ? BoundAccess.Write.WithWriteRef(FlowAnalysis.TypeRefMask.AnyType) : BoundAccess.Write
).GetOnlyBoundElement());
// ForeachMoveNextEdge : ConditionalEdge
var moveEdge = new ForeachMoveNextEdge(move, body, end, enumereeEdge,
keyVar, valueVar,
Span.FromBounds(x.Enumeree.Span.End + 1, (x.KeyVariable ?? x.ValueVariable).Span.Start - 1).ToTextSpan() /*"as" between enumeree and variables*/);
// while (enumerator.MoveNext()) {
// var value = enumerator.Current.Value
// var key = enumerator.Current.Key
// Block
// { x.Body }
_current = WithOpenScope(WithNewOrdinal(body));
VisitElement(x.Body);
CloseScope();
// goto ContinueTarget;
Connect(_current, move);
// BreakTarget:
CloseBreakScope();
//
_current = WithNewOrdinal(end);
}
public override void VisitForeachStmt(ForeachStmt x)
{
var end = NewBlock();
var move = NewBlock();
var body = NewBlock();
// _current -> move -> body -> move -> ...
// ForeachEnumereeEdge : SimpleEdge
// x.Enumeree.GetEnumerator();
var enumereeEdge = new ForeachEnumereeEdge(_current, move, _binder.BindExpression(x.Enumeree, BoundAccess.Read), x.ValueVariable.Alias);
// ContinueTarget:
OpenBreakScope(end, move);
// ForeachMoveNextEdge : ConditionalEdge
var moveEdge = new ForeachMoveNextEdge(move, body, end, enumereeEdge,
(x.KeyVariable != null) ? (BoundReferenceExpression)_binder.BindExpression(x.KeyVariable.Variable, BoundAccess.Write) : null,
(BoundReferenceExpression)_binder.BindExpression(
(Expression)x.ValueVariable.Variable ?? x.ValueVariable.List,
x.ValueVariable.Alias ? BoundAccess.Write.WithWriteRef(FlowAnalysis.TypeRefMask.AnyType) : BoundAccess.Write));
// while (enumerator.MoveNext()) {
// var key = enumerator.Current.Key
// var value = enumerator.Current.Value
// Block
// { x.Body }
_current = WithOpenScope(WithNewOrdinal(body));
VisitElement(x.Body);
CloseScope();
// goto ContinueTarget;
Connect(_current, move);
// BreakTarget:
CloseBreakScope();
//
_current = WithNewOrdinal(end);
}
public override void VisitCFGForeachMoveNextEdge(ForeachMoveNextEdge x)
{
var state = _state;
// get type information from Enumeree to determine types value variable
var elementType = HandleTraversableUse(x.EnumereeEdge.Enumeree);
if (elementType.IsVoid) elementType = TypeRefMask.AnyType;
// Body branch
_state = state.Clone();
// set key variable and value variable at current state
var valueVar = x.ValueVariable;
if (valueVar is BoundListEx)
{
throw new NotImplementedException();
//VisitListEx(valueVar.List, elementType);
}
else
{
valueVar.Access = valueVar.Access.WithWrite(elementType);
Accept(valueVar);
//
var keyVar = x.KeyVariable;
if (keyVar != null)
{
keyVar.Access = keyVar.Access.WithWrite(TypeRefMask.AnyType);
Accept(keyVar);
}
}
TraverseToBlock(_state, x.BodyBlock);
// End branch
_state = state.Clone();
TraverseToBlock(_state, x.NextBlock);
}
public virtual void VisitCFGForeachMoveNextEdge(ForeachMoveNextEdge x)
{
Accept(x.ValueVariable);
Accept(x.KeyVariable);
x.BodyBlock.Accept(this);
x.NextBlock.Accept(this);
}
public virtual TResult VisitCFGForeachMoveNextEdge(ForeachMoveNextEdge x) => DefaultVisitEdge(x);