public override BoundNode VisitLocalFunctionStatement(BoundLocalFunctionStatement node)
{
var oldCurrentFunction = _F.CurrentFunction;
_F.CurrentFunction = node.Symbol;
var result = base.VisitLocalFunctionStatement(node);
_F.CurrentFunction = oldCurrentFunction;
return(result);
}
public override BoundNode VisitLocalFunctionStatement(BoundLocalFunctionStatement node)
{
if (IsInside && !node.WasCompilerGenerated)
{
foreach (var parameter in node.Symbol.Parameters)
{
_variablesDeclared.Add(parameter);
}
}
return(base.VisitLocalFunctionStatement(node));
}
public override BoundNode VisitLocalFunctionStatement(BoundLocalFunctionStatement node)
{
var outerLocalFunction = _staticLocalFunction;
if (node.Symbol.IsStaticLocalFunction)
{
_staticLocalFunction = node.Symbol;
}
var result = base.VisitLocalFunctionStatement(node);
_staticLocalFunction = outerLocalFunction;
return(result);
}
public override BoundNode VisitLocalFunctionStatement(BoundLocalFunctionStatement node)
{
var origLabels = this.currentLabels;
var origSeenAwait = _seenAwait;
this.currentLabels = null;
_seenAwait = false;
base.VisitLocalFunctionStatement(node);
this.currentLabels = origLabels;
_seenAwait = origSeenAwait;
return(null);
}
public override BoundNode VisitLocalFunctionStatement(BoundLocalFunctionStatement node)
{
var oldContainingSymbol = _F.CurrentFunction;
var oldAwaitFinallyFrame = _currentAwaitFinallyFrame;
_F.CurrentFunction = node.Symbol;
_currentAwaitFinallyFrame = new AwaitFinallyFrame();
var result = base.VisitLocalFunctionStatement(node);
_F.CurrentFunction = oldContainingSymbol;
_currentAwaitFinallyFrame = oldAwaitFinallyFrame;
return(result);
}
public override BoundNode VisitLocalFunctionStatement(BoundLocalFunctionStatement node)
{
_sawLocalFunctions = true;
CheckRefReadOnlySymbols(node.Symbol);
var typeParameters = node.Symbol.TypeParameters;
if (typeParameters.Any(typeParameter => typeParameter.HasUnmanagedTypeConstraint))
{
_factory.CompilationState.ModuleBuilderOpt?.EnsureIsUnmanagedAttributeExists();
}
bool constraintsNeedNullableAttribute = typeParameters.Any(
typeParameter => (typeParameter.HasReferenceTypeConstraint && typeParameter.ReferenceTypeConstraintIsNullable != null) ||
typeParameter.ConstraintTypesNoUseSiteDiagnostics.Any(
typeConstraint => typeConstraint.NeedsNullableAttribute()));
bool returnTypeNeedsNullableAttribute = node.Symbol.ReturnType.NeedsNullableAttribute();
bool parametersNeedNullableAttribute = node.Symbol.ParameterTypes.Any(parameter => parameter.NeedsNullableAttribute());
if (constraintsNeedNullableAttribute || returnTypeNeedsNullableAttribute || parametersNeedNullableAttribute)
{
_factory.CompilationState.ModuleBuilderOpt?.EnsureNullableAttributeExists();
}
var oldContainingSymbol = _factory.CurrentFunction;
try
{
_factory.CurrentFunction = node.Symbol;
return(base.VisitLocalFunctionStatement(node));
}
finally
{
_factory.CurrentFunction = oldContainingSymbol;
}
}
public override BoundNode VisitLocalFunctionStatement(BoundLocalFunctionStatement node)
{
return(VisitLocalFunctionOrLambda(node.Body));
}
public override BoundNode VisitLocalFunctionStatement(BoundLocalFunctionStatement node)
{
MakeSlots(node.Symbol.Parameters);
return(base.VisitLocalFunctionStatement(node));
}
public override BoundNode VisitLocalFunctionStatement(BoundLocalFunctionStatement localFunc)
{
var oldSymbol = this.currentSymbol;
var localFuncSymbol = localFunc.Symbol;
this.currentSymbol = localFuncSymbol;
var oldPending = SavePending(); // we do not support branches into a lambda
// SPEC: The entry point to a local function is always reachable.
// Captured variables are definitely assigned if they are definitely assigned on
// all branches into the local function.
var savedState = this.State;
this.State = this.TopState();
if (!localFunc.WasCompilerGenerated)
{
EnterParameters(localFuncSymbol.Parameters);
}
// Captured variables are definitely assigned if they are assigned on
// all branches into the local function, so we store all reads from
// possibly unassigned captured variables and later report definite
// assignment errors if any of the captured variables is not assigned
// on a particular branch.
//
// Assignments to captured variables are also recorded, as calls to local functions
// definitely assign captured variables if the variables are definitely assigned at
// all branches out of the local function.
var usages = GetOrCreateLocalFuncUsages(localFuncSymbol);
var oldReads = usages.ReadVars.Clone();
usages.ReadVars.Clear();
var oldPending2 = SavePending();
// If this is an iterator, there's an implicit branch before the first statement
// of the function where the enumerable is returned.
if (localFuncSymbol.IsIterator)
{
PendingBranches.Add(new PendingBranch(null, this.State, null));
}
VisitAlways(localFunc.Body);
RestorePending(oldPending2); // process any forward branches within the lambda body
ImmutableArray <PendingBranch> pendingReturns = RemoveReturns();
RestorePending(oldPending);
Location location = null;
if (!localFuncSymbol.Locations.IsDefaultOrEmpty)
{
location = localFuncSymbol.Locations[0];
}
LeaveParameters(localFuncSymbol.Parameters, localFunc.Syntax, location);
// Intersect the state of all branches out of the local function
LocalState stateAtReturn = this.State;
foreach (PendingBranch pending in pendingReturns)
{
this.State = pending.State;
BoundNode branch = pending.Branch;
// Pass the local function identifier as a location if the branch
// is null or compiler generated.
LeaveParameters(localFuncSymbol.Parameters,
branch?.Syntax,
branch?.WasCompilerGenerated == false ? null : location);
Join(ref stateAtReturn, ref this.State);
}
// Check for changes to the possibly unassigned and assigned sets
// of captured variables
if (RecordChangedVars(ref usages.WrittenVars,
ref stateAtReturn,
ref oldReads,
ref usages.ReadVars) &&
usages.LocalFuncVisited)
{
// If the sets have changed and we already used the results
// of this local function in another computation, the previous
// calculations may be invalid. We need to analyze until we
// reach a fixed-point. The previous writes are always valid,
// so they are stored in usages.WrittenVars, while the reads
// may be invalidated by new writes, so we throw the results out.
stateChangedAfterUse = true;
usages.LocalFuncVisited = false;
}
this.State = savedState;
this.currentSymbol = oldSymbol;
return(null);
}