/// <summary>
/// Get the symbol for a well-known member. The use of this method to get a well-known member
/// that does not exist will result in an exception of type MissingPredefinedMember being thrown
/// containing an appropriate diagnostic for the caller to report.
/// </summary>
/// <param name="wm">The desired well-known member</param>
/// <param name="isOptional">If true, the method may return null for a missing member without an exception</param>
/// <returns>A symbol for the well-known member, or null if it is missing and isOptions == true</returns>
public Symbol WellKnownMember(WellKnownMember wm, bool isOptional = false)
{
Symbol wellKnownMember = Binder.GetWellKnownTypeMember(Compilation, wm, Diagnostics, syntax: Syntax, isOptional: true);
if (wellKnownMember == null && !isOptional)
{
RuntimeMembers.MemberDescriptor memberDescriptor = WellKnownMembers.GetDescriptor(wm);
WellKnownType containingType = (WellKnownType)memberDescriptor.DeclaringTypeId;
var diagnostic = new CSDiagnostic(new CSDiagnosticInfo(ErrorCode.ERR_MissingPredefinedMember, containingType.GetMetadataName(), memberDescriptor.Name), Syntax.Location);
throw new MissingPredefinedMember(diagnostic);
}
return(wellKnownMember);
}
/// <summary>
/// Get the symbol for a special member. The use of this method to get a special member
/// that does not exist will result in an exception of type MissingPredefinedMember being thrown
/// containing an appropriate diagnostic for the caller to report.
/// </summary>
/// <param name="sm">The desired special member</param>
/// <returns>A symbol for the special member.</returns>
public Symbol SpecialMember(SpecialMember sm)
{
Symbol specialMember = Compilation.GetSpecialTypeMember(sm);
if (specialMember == null)
{
RuntimeMembers.MemberDescriptor memberDescriptor = SpecialMembers.GetDescriptor(sm);
SpecialType containingType = (SpecialType)memberDescriptor.DeclaringTypeId;
var diagnostic = new CSDiagnostic(new CSDiagnosticInfo(ErrorCode.ERR_MissingPredefinedMember, containingType.GetMetadataName(), memberDescriptor.Name), Syntax.Location);
throw new MissingPredefinedMember(diagnostic);
}
Binder.ReportUseSiteDiagnostics(specialMember, Diagnostics, Syntax);
return(specialMember);
}
