private void ValidateCallerLineNumberAttribute(AttributeSyntax node, DiagnosticBag diagnostics)
{
CSharpCompilation compilation = this.DeclaringCompilation;
HashSet <DiagnosticInfo> useSiteDiagnostics = null;
if (!IsValidCallerInfoContext(node))
{
// CS4024: The CallerLineNumberAttribute applied to parameter '{0}' will have no effect because it applies to a
// member that is used in contexts that do not allow optional arguments
diagnostics.Add(ErrorCode.WRN_CallerLineNumberParamForUnconsumedLocation, node.Name.Location, CSharpSyntaxNode.Identifier.ValueText);
}
else if (!compilation.Conversions.HasCallerLineNumberConversion(Type, ref useSiteDiagnostics))
{
// CS4017: CallerLineNumberAttribute cannot be applied because there are no standard conversions from type '{0}' to type '{1}'
TypeSymbol intType = compilation.GetSpecialType(SpecialType.System_Int32);
diagnostics.Add(ErrorCode.ERR_NoConversionForCallerLineNumberParam, node.Name.Location, intType, Type);
}
else if (!HasExplicitDefaultValue && !ContainingSymbol.IsPartialImplementation()) // attribute applied to parameter without default
{
// Unconsumed location checks happen first, so we require a default value.
// CS4020: The CallerLineNumberAttribute may only be applied to parameters with default values
diagnostics.Add(ErrorCode.ERR_BadCallerLineNumberParamWithoutDefaultValue, node.Name.Location);
}
diagnostics.Add(node.Name.Location, useSiteDiagnostics);
}
