private Binder(Binder next, BinderFlags flags)
{
Debug.Assert(next != null);
_next = next;
this.Flags = flags;
_compilation = next._compilation;
}
public static void ReportDiagnosticsIfObsolete(
DiagnosticBag diagnostics,
Symbol symbol,
SyntaxNodeOrToken node,
bool hasBaseReceiver,
Symbol containingMember,
NamedTypeSymbol containingType,
BinderFlags location)
{
Debug.Assert((object)symbol != null);
// Dev11 also reports on the unconstructed method. It would be nice to report on
// the constructed method, but then we wouldn't be able to walk the override chain.
if (symbol is MemberSymbol memberSymbol)
{
symbol = symbol.ConstructedFrom;
}
// There are two reasons to walk up to the least-overridden member:
// 1) That's the method to which we will actually emit a call.
// 2) We don't know what virtual dispatch will do at runtime so an
// overriding member is basically a shot in the dark. Better to
// just be consistent and always use the least-overridden member.
Symbol leastOverriddenSymbol = symbol.GetConstructedLeastOverriddenMember(containingType);
bool checkOverridingSymbol = hasBaseReceiver && !ReferenceEquals(symbol, leastOverriddenSymbol);
if (checkOverridingSymbol)
{
// If we have a base receiver, we must be done with declaration binding, so it should
// be safe to decode diagnostics. We want to do this since reporting for the overriding
// member is conditional on reporting for the overridden member (i.e. we need a definite
// answer so we don't double-report). You might think that double reporting just results
// in cascading diagnostics, but it's possible that the second diagnostic is an error
// while the first is merely a warning.
leastOverriddenSymbol.GetAttributes();
}
var diagnosticKind = ReportDiagnosticsIfObsoleteInternal(diagnostics, leastOverriddenSymbol, node, containingMember, location);
// CONSIDER: In place of hasBaseReceiver, dev11 also accepts cases where symbol.ContainingType is a "simple type" (e.g. int)
// or a special by-ref type (e.g. ArgumentHandle). These cases are probably more important for other checks performed by
// ExpressionBinder::PostBindMethod, but they do appear to ObsoleteAttribute as well. We're skipping them because they
// don't make much sense for ObsoleteAttribute (e.g. this would seem to address the case where int.ToString has been made
// obsolete but object.ToString has not).
// If the overridden member was not definitely obsolete and this is a (non-virtual) base member
// access, then check the overriding symbol as well.
switch (diagnosticKind)
{
case ObsoleteDiagnosticKind.NotObsolete:
case ObsoleteDiagnosticKind.Lazy:
if (checkOverridingSymbol)
{
Debug.Assert(diagnosticKind != ObsoleteDiagnosticKind.Lazy, "We forced attribute binding above.");
ReportDiagnosticsIfObsoleteInternal(diagnostics, symbol, node, containingMember, location);
}
break;
}
}
public Binder WithFlags(params BinderFlags[] flags)
{
BinderFlags union = FlagsObject.Union <BinderFlags>(flags);
return(this.Flags == union
? this
: new Binder(this, union));
}
public Binder(Binder next, Conversions conversions = null)
{
Debug.Assert(next != null);
_next = next;
this.Flags = next.Flags;
_compilation = next._compilation;
_lazyConversions = conversions;
}
internal static ObsoleteDiagnosticKind ReportDiagnosticsIfObsoleteInternal(DiagnosticBag diagnostics, Symbol symbol, SyntaxNodeOrToken node, Symbol containingMember, BinderFlags location)
{
Debug.Assert(diagnostics != null);
var kind = ObsoleteAttributeHelpers.GetObsoleteDiagnosticKind(symbol, containingMember);
DiagnosticInfo info = null;
switch (kind)
{
case ObsoleteDiagnosticKind.Diagnostic:
info = ObsoleteAttributeHelpers.CreateObsoleteDiagnostic(symbol, location);
break;
case ObsoleteDiagnosticKind.Lazy:
case ObsoleteDiagnosticKind.LazyPotentiallySuppressed:
info = new LazyObsoleteDiagnosticInfo(symbol, containingMember, location);
break;
}
if (info != null)
{
diagnostics.Add(info, node.GetLocation());
}
return(kind);
}
/// <summary>
/// Used to create a root binder.
/// </summary>
public Binder(LanguageCompilation compilation)
{
Debug.Assert(compilation != null);
this.Flags = compilation.Options.TopLevelBinderFlags;
_compilation = compilation;
}