/// <summary>
/// This function tells whether one of our base classes implements
/// the given method (which turns out, it is valid to have an interface
/// implementation in a base
/// </summary>
bool BaseImplements(TypeSpec iface_type, MethodSpec mi, out MethodSpec base_method)
{
base_method = null;
var base_type = container.BaseType;
//
// Setup filter with no return type to give better error message
// about mismatch at return type when the check bellow rejects them
//
var parameters = mi.Parameters;
MethodSpec close_match = null;
while (true)
{
var candidates = MemberCache.FindMembers(base_type, mi.Name, false);
if (candidates == null)
{
base_method = close_match;
return(false);
}
MethodSpec similar_candidate = null;
foreach (var candidate in candidates)
{
if (candidate.Kind != MemberKind.Method)
{
continue;
}
if (candidate.Arity != mi.Arity)
{
continue;
}
var candidate_param = ((MethodSpec)candidate).Parameters;
if (!TypeSpecComparer.Override.IsEqual(parameters.Types, candidate_param.Types))
{
continue;
}
bool modifiers_match = true;
for (int i = 0; i < parameters.Count; ++i)
{
//
// First check exact ref/out match
//
if ((parameters.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask) == (candidate_param.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask))
{
continue;
}
modifiers_match = false;
//
// Different in ref/out only
//
if ((parameters.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask) != (candidate_param.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask))
{
if (similar_candidate == null)
{
if (!candidate.IsPublic)
{
break;
}
if (!TypeSpecComparer.Override.IsEqual(mi.ReturnType, ((MethodSpec)candidate).ReturnType))
{
break;
}
// It's used for ref/out ambiguity overload check
similar_candidate = (MethodSpec)candidate;
}
continue;
}
similar_candidate = null;
break;
}
if (!modifiers_match)
{
continue;
}
//
// From this point the candidate is used for detailed error reporting
// because it's very close match to what we are looking for
//
var m = (MethodSpec)candidate;
if (!m.IsPublic)
{
if (close_match == null)
{
close_match = m;
}
continue;
}
if (!TypeSpecComparer.Override.IsEqual(mi.ReturnType, m.ReturnType))
{
if (close_match == null)
{
close_match = m;
}
continue;
}
base_method = m;
if (mi.IsGeneric && !Method.CheckImplementingMethodConstraints(container, m, mi))
{
return(true);
}
}
if (base_method != null)
{
if (similar_candidate != null)
{
Report.SymbolRelatedToPreviousError(similar_candidate);
Report.SymbolRelatedToPreviousError(mi);
Report.SymbolRelatedToPreviousError(container);
Report.Warning(1956, 1, ((MemberCore)base_method.MemberDefinition).Location,
"The interface method `{0}' implementation is ambiguous between following methods: `{1}' and `{2}' in type `{3}'",
mi.GetSignatureForError(), base_method.GetSignatureForError(), similar_candidate.GetSignatureForError(), container.GetSignatureForError());
}
break;
}
base_type = candidates[0].DeclaringType.BaseType;
if (base_type == null)
{
base_method = close_match;
return(false);
}
}
if (!base_method.IsVirtual)
{
#if STATIC
var base_builder = base_method.GetMetaInfo() as MethodBuilder;
if (base_builder != null)
{
//
// We can avoid creating a proxy if base_method can be marked 'final virtual'. This can
// be done for all methods from compiled assembly
//
base_builder.__SetAttributes(base_builder.Attributes | MethodAttributes.Virtual | MethodAttributes.Final | MethodAttributes.NewSlot);
return(true);
}
#endif
DefineProxy(iface_type, base_method, mi);
}
return(true);
}
/// <summary>
/// This function tells whether one of our base classes implements
/// the given method (which turns out, it is valid to have an interface
/// implementation in a base
/// </summary>
bool BaseImplements(TypeSpec iface_type, MethodSpec mi, out MethodSpec base_method)
{
base_method = null;
bool base_can_implement = true;
TypeSpec lookup_type;
//
// Special handling for properties/indexers which cannot have accessors
// implementing an interface found in different types (e.g. current and base)
//
if (mi.IsAccessor && container.Interfaces != null)
{
bool new_implementation = false;
foreach (var iface in container.Interfaces)
{
if (TypeSpecComparer.IsEqual(iface, iface_type))
{
new_implementation = true;
break;
}
}
if (new_implementation)
{
MemberFilter filter;
if (mi.Parameters.Count > 1)
{
var indexer_params = mi.Name [0] == 'g' ? mi.Parameters : IndexerSpec.CreateParametersFromSetter(mi, mi.Parameters.Count - 1);
filter = new MemberFilter(MemberCache.IndexerNameAlias, 0, MemberKind.Indexer, indexer_params, null);
}
else
{
var pname = mi.Name.Substring(4);
filter = MemberFilter.Property(pname, null);
}
var prop = MemberCache.FindMember(container.CurrentType, filter, BindingRestriction.DeclaredOnly | BindingRestriction.InstanceOnly);
if (prop != null && (prop.Modifiers & Modifiers.NEW) != 0)
{
base_can_implement = false;
}
}
}
if (base_can_implement)
{
lookup_type = container.BaseType;
if (lookup_type.ImplementsInterface(iface_type, false))
{
return(true);
}
}
else
{
lookup_type = container.CurrentType;
}
//
// Setup filter with no return type to give better error message
// about mismatch at return type when the check bellow rejects them
//
var parameters = mi.Parameters;
MethodSpec close_match = null;
while (true)
{
var candidates = MemberCache.FindMembers(lookup_type, mi.Name, !base_can_implement);
if (candidates == null)
{
base_method = close_match;
return(false);
}
MethodSpec similar_candidate = null;
foreach (var candidate in candidates)
{
if (candidate.Kind != MemberKind.Method)
{
continue;
}
if (candidate.Arity != mi.Arity)
{
continue;
}
var candidate_param = ((MethodSpec)candidate).Parameters;
if (!TypeSpecComparer.Override.IsEqual(parameters.Types, candidate_param.Types))
{
continue;
}
bool modifiers_match = true;
for (int i = 0; i < parameters.Count; ++i)
{
//
// First check exact ref/out match
//
if ((parameters.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask) == (candidate_param.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask))
{
continue;
}
modifiers_match = false;
//
// Different in ref/out only
//
if ((parameters.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask) != (candidate_param.FixedParameters[i].ModFlags & Parameter.Modifier.RefOutMask))
{
if (similar_candidate == null)
{
if (!candidate.IsPublic)
{
break;
}
if (!TypeSpecComparer.Override.IsEqual(mi.ReturnType, ((MethodSpec)candidate).ReturnType))
{
break;
}
// It's used for ref/out ambiguity overload check
similar_candidate = (MethodSpec)candidate;
}
continue;
}
similar_candidate = null;
break;
}
if (!modifiers_match)
{
continue;
}
//
// From this point the candidate is used for detailed error reporting
// because it's very close match to what we are looking for
//
var m = (MethodSpec)candidate;
if (!m.IsPublic)
{
if (close_match == null)
{
close_match = m;
}
continue;
}
if (!TypeSpecComparer.Override.IsEqual(mi.ReturnType, m.ReturnType))
{
if (close_match == null)
{
close_match = m;
}
continue;
}
base_method = m;
if (mi.IsGeneric && !Method.CheckImplementingMethodConstraints(container, m, mi))
{
return(true);
}
}
if (base_method != null)
{
if (similar_candidate != null)
{
Report.SymbolRelatedToPreviousError(similar_candidate);
Report.SymbolRelatedToPreviousError(mi);
Report.SymbolRelatedToPreviousError(container);
Report.Warning(1956, 1, ((MemberCore)base_method.MemberDefinition).Location,
"The interface method `{0}' implementation is ambiguous between following methods: `{1}' and `{2}' in type `{3}'",
mi.GetSignatureForError(), base_method.GetSignatureForError(), similar_candidate.GetSignatureForError(), container.GetSignatureForError());
}
break;
}
if (!base_can_implement)
{
return(false);
}
lookup_type = candidates[0].DeclaringType.BaseType;
if (lookup_type == null)
{
base_method = close_match;
return(false);
}
}
if (!base_method.IsVirtual)
{
#if STATIC
var base_builder = base_method.GetMetaInfo() as MethodBuilder;
if (base_builder != null)
{
//
// We can avoid creating a proxy if base_method can be marked 'final virtual'. This can
// be done for all methods from compiled assembly
//
base_builder.__SetAttributes(base_builder.Attributes | MethodAttributes.Virtual | MethodAttributes.Final | MethodAttributes.NewSlot);
return(true);
}
#endif
DefineProxy(iface_type, base_method, mi);
}
return(true);
}