protected int MakeMemberSlot(BoundExpression receiverOpt, Symbol member)
{
int containingSlot = -1;
if (member.RequiresInstanceReceiver())
{
if (receiverOpt is null)
{
return(-1);
}
containingSlot = MakeSlot(receiverOpt);
if (containingSlot < 0)
{
return(-1);
}
}
return(GetOrCreateSlot(member, containingSlot));
}
/// <summary>
/// Checks if 'symbol' is accessible from within 'within', which must be a NamedTypeSymbol
/// or an AssemblySymbol.
/// </summary>
/// <remarks>
/// Note that NamedTypeSymbol, if available, is the type that is associated with the binder
/// that found the 'symbol', not the inner-most type that contains the access to the
/// 'symbol'.
/// <para>
/// If 'symbol' is accessed off of an expression then 'throughTypeOpt' is the type of that
/// expression. This is needed to properly do protected access checks. Sets
/// "failedThroughTypeCheck" to true if this protected check failed.
/// </para>
/// <para>
/// This function is expected to be called a lot. As such, it avoids memory
/// allocations in the function itself (including not making any iterators). This means
/// that certain helper functions that could otherwise be called are inlined in this method to
/// prevent the overhead of returning collections or enumerators.
/// </para>
/// </remarks>
private static bool IsSymbolAccessibleCore(
Symbol symbol,
Symbol within, // must be assembly or named type symbol
TypeSymbol throughTypeOpt,
out bool failedThroughTypeCheck,
CSharpCompilation compilation,
ref HashSet <DiagnosticInfo> useSiteDiagnostics,
ConsList <TypeSymbol> basesBeingResolved = null)
{
Debug.Assert((object)symbol != null);
Debug.Assert((object)within != null);
Debug.Assert(within.IsDefinition);
Debug.Assert(within is NamedTypeSymbol || within is AssemblySymbol);
failedThroughTypeCheck = false;
switch (symbol.Kind)
{
case SymbolKind.ArrayType:
return(IsSymbolAccessibleCore(((ArrayTypeSymbol)symbol).ElementType, within, null, out failedThroughTypeCheck, compilation, ref useSiteDiagnostics, basesBeingResolved));
case SymbolKind.PointerType:
return(IsSymbolAccessibleCore(((PointerTypeSymbol)symbol).PointedAtType, within, null, out failedThroughTypeCheck, compilation, ref useSiteDiagnostics, basesBeingResolved));
case SymbolKind.NamedType:
return(IsNamedTypeAccessible((NamedTypeSymbol)symbol, within, ref useSiteDiagnostics, basesBeingResolved));
case SymbolKind.Alias:
return(IsSymbolAccessibleCore(((AliasSymbol)symbol).Target, within, null, out failedThroughTypeCheck, compilation, ref useSiteDiagnostics, basesBeingResolved));
case SymbolKind.Discard:
return(IsSymbolAccessibleCore(((DiscardSymbol)symbol).TypeWithAnnotations.Type, within, null, out failedThroughTypeCheck, compilation, ref useSiteDiagnostics, basesBeingResolved));
case SymbolKind.FunctionPointer:
var funcPtr = (FunctionPointerTypeSymbol)symbol;
if (!IsSymbolAccessibleCore(funcPtr.Signature.ReturnType, within, throughTypeOpt: null, out failedThroughTypeCheck, compilation, ref useSiteDiagnostics, basesBeingResolved))
{
return(false);
}
foreach (var param in funcPtr.Signature.Parameters)
{
if (!IsSymbolAccessibleCore(param.Type, within, throughTypeOpt: null, out failedThroughTypeCheck, compilation, ref useSiteDiagnostics, basesBeingResolved))
{
return(false);
}
}
return(true);
case SymbolKind.ErrorType:
// Always assume that error types are accessible.
return(true);
case SymbolKind.TypeParameter:
case SymbolKind.Parameter:
case SymbolKind.Local:
case SymbolKind.Label:
case SymbolKind.Namespace:
case SymbolKind.DynamicType:
case SymbolKind.Assembly:
case SymbolKind.NetModule:
case SymbolKind.RangeVariable:
case SymbolKind.Method when((MethodSymbol)symbol).MethodKind == MethodKind.LocalFunction:
// These types of symbols are always accessible (if visible).
return(true);
case SymbolKind.Method:
case SymbolKind.Property:
case SymbolKind.Event:
case SymbolKind.Field:
if (!symbol.RequiresInstanceReceiver())
{
// static members aren't accessed "through" an "instance" of any type. So we
// null out the "through" instance here. This ensures that we'll understand
// accessing protected statics properly.
throughTypeOpt = null;
}
return(IsMemberAccessible(symbol.ContainingType, symbol.DeclaredAccessibility, within, throughTypeOpt, out failedThroughTypeCheck, compilation, ref useSiteDiagnostics));
default:
throw ExceptionUtilities.UnexpectedValue(symbol.Kind);
}
}