static bool isDeclVisibleInLookupMode(ValueDecl *Member, LookupState LS,
const DeclContext *FromContext,
LazyResolver *TypeResolver) {
// Accessors are never visible directly in the source language.
if (isa<AccessorDecl>(Member))
return false;
if (TypeResolver) {
TypeResolver->resolveDeclSignature(Member);
}
// Check access when relevant.
if (!Member->getDeclContext()->isLocalContext() &&
!isa<GenericTypeParamDecl>(Member) && !isa<ParamDecl>(Member) &&
FromContext->getASTContext().LangOpts.EnableAccessControl) {
if (!Member->isAccessibleFrom(FromContext))
return false;
}
if (auto *FD = dyn_cast<FuncDecl>(Member)) {
// Cannot call static functions on non-metatypes.
if (!LS.isOnMetatype() && FD->isStatic())
return false;
// Otherwise, either call a function or curry it.
return true;
}
if (auto *VD = dyn_cast<VarDecl>(Member)) {
// Cannot use static properties on non-metatypes.
if (!(LS.isQualified() && LS.isOnMetatype()) && VD->isStatic())
return false;
// Cannot use instance properties on metatypes.
if (LS.isOnMetatype() && !VD->isStatic() && !LS.isIncludingInstanceMembers())
return false;
return true;
}
if (isa<EnumElementDecl>(Member)) {
// Cannot reference enum elements on non-metatypes.
if (!(LS.isQualified() && LS.isOnMetatype()))
return false;
}
if (auto CD = dyn_cast<ConstructorDecl>(Member)) {
// Constructors with stub implementations cannot be called in Swift.
if (CD->hasStubImplementation())
return false;
if (LS.isQualified() && LS.isOnSuperclass()) {
// Cannot call initializers from a superclass, except for inherited
// convenience initializers.
return LS.isInheritsSuperclassInitializers() && CD->isInheritable();
}
}
if (isa<TypeDecl>(Member))
return areTypeDeclsVisibleInLookupMode(LS);
return true;
}
void swift::lookupVisibleMemberDecls(VisibleDeclConsumer &Consumer, Type BaseTy,
const DeclContext *CurrDC,
LazyResolver *TypeResolver,
bool includeInstanceMembers) {
assert(CurrDC);
LookupState ls = LookupState::makeQualified();
if (includeInstanceMembers) {
ls = ls.withIncludedInstanceMembers();
}
::lookupVisibleMemberDecls(BaseTy, Consumer, CurrDC, ls,
DeclVisibilityKind::MemberOfCurrentNominal,
TypeResolver);
}
static void lookupVisibleMemberDeclsImpl(
Type BaseTy, VisibleDeclConsumer &Consumer, const DeclContext *CurrDC,
LookupState LS, DeclVisibilityKind Reason, LazyResolver *TypeResolver,
GenericSignatureBuilder *GSB, VisitedSet &Visited) {
// Just look through l-valueness. It doesn't affect name lookup.
assert(BaseTy && "lookup into null type");
assert(!BaseTy->hasLValueType());
// Handle metatype references, as in "some_type.some_member". These are
// special and can't have extensions.
if (auto MTT = BaseTy->getAs<AnyMetatypeType>()) {
// The metatype represents an arbitrary named type: dig through to the
// declared type to see what we're dealing with.
Type Ty = MTT->getInstanceType();
LookupState subLS = LookupState::makeQualified().withOnMetatype();
if (LS.isIncludingInstanceMembers()) {
subLS = subLS.withIncludedInstanceMembers();
}
// Just perform normal dot lookup on the type see if we find extensions or
// anything else. For example, type SomeTy.SomeMember can look up static
// functions, and can even look up non-static functions as well (thus
// getting the address of the member).
lookupVisibleMemberDeclsImpl(Ty, Consumer, CurrDC, subLS, Reason,
TypeResolver, GSB, Visited);
return;
}
// Lookup module references, as on some_module.some_member. These are
// special and can't have extensions.
if (ModuleType *MT = BaseTy->getAs<ModuleType>()) {
AccessFilteringDeclConsumer FilteringConsumer(CurrDC, Consumer,
TypeResolver);
MT->getModule()->lookupVisibleDecls(ModuleDecl::AccessPathTy(),
FilteringConsumer,
NLKind::QualifiedLookup);
return;
}
// If the base is AnyObject, we are doing dynamic lookup.
if (BaseTy->isAnyObject()) {
doDynamicLookup(Consumer, CurrDC, LS, TypeResolver);
return;
}
// If the base is a protocol, enumerate its members.
if (ProtocolType *PT = BaseTy->getAs<ProtocolType>()) {
lookupVisibleProtocolMemberDecls(BaseTy, PT, Consumer, CurrDC, LS, Reason,
TypeResolver, GSB, Visited);
return;
}
// If the base is a protocol composition, enumerate members of the protocols.
if (auto PC = BaseTy->getAs<ProtocolCompositionType>()) {
for (auto Member : PC->getMembers())
lookupVisibleMemberDeclsImpl(Member, Consumer, CurrDC, LS, Reason,
TypeResolver, GSB, Visited);
return;
}
// Enumerate members of archetype's requirements.
if (ArchetypeType *Archetype = BaseTy->getAs<ArchetypeType>()) {
for (auto Proto : Archetype->getConformsTo())
lookupVisibleProtocolMemberDecls(
BaseTy, Proto->getDeclaredType(), Consumer, CurrDC, LS,
getReasonForSuper(Reason), TypeResolver, GSB, Visited);
if (auto superclass = Archetype->getSuperclass())
lookupVisibleMemberDeclsImpl(superclass, Consumer, CurrDC, LS,
getReasonForSuper(Reason), TypeResolver,
GSB, Visited);
return;
}
// If we're looking into a type parameter and we have a generic signature
// builder, use the GSB to resolve where we should look.
if (BaseTy->isTypeParameter() && GSB) {
auto EquivClass =
GSB->resolveEquivalenceClass(BaseTy,
ArchetypeResolutionKind::CompleteWellFormed);
if (!EquivClass) return;
if (EquivClass->concreteType) {
BaseTy = EquivClass->concreteType;
} else {
// Conformances
for (const auto &Conforms : EquivClass->conformsTo) {
lookupVisibleProtocolMemberDecls(
BaseTy, Conforms.first->getDeclaredType(), Consumer, CurrDC,
LS, getReasonForSuper(Reason), TypeResolver, GSB, Visited);
}
// Superclass.
if (EquivClass->superclass) {
lookupVisibleMemberDeclsImpl(EquivClass->superclass, Consumer, CurrDC,
LS, getReasonForSuper(Reason),
TypeResolver, GSB, Visited);
}
return;
}
}
llvm::SmallPtrSet<ClassDecl *, 8> Ancestors;
do {
NominalTypeDecl *CurNominal = BaseTy->getAnyNominal();
if (!CurNominal)
break;
// Look in for members of a nominal type.
lookupTypeMembers(BaseTy, BaseTy, Consumer, CurrDC, LS, Reason,
TypeResolver);
lookupDeclsFromProtocolsBeingConformedTo(BaseTy, Consumer, LS, CurrDC,
Reason, TypeResolver, Visited);
// If we have a class type, look into its superclass.
auto *CurClass = dyn_cast<ClassDecl>(CurNominal);
if (CurClass && CurClass->hasSuperclass()) {
// FIXME: This path is no substitute for an actual circularity check.
// The real fix is to check that the superclass doesn't introduce a
// circular reference before it's written into the AST.
if (Ancestors.count(CurClass)) {
break;
}
BaseTy = CurClass->getSuperclass();
Reason = getReasonForSuper(Reason);
bool InheritsSuperclassInitializers =
CurClass->inheritsSuperclassInitializers(TypeResolver);
if (LS.isOnSuperclass() && !InheritsSuperclassInitializers)
LS = LS.withoutInheritsSuperclassInitializers();
else if (!LS.isOnSuperclass()) {
LS = LS.withOnSuperclass();
if (InheritsSuperclassInitializers)
LS = LS.withInheritsSuperclassInitializers();
}
} else {
break;
}
Ancestors.insert(CurClass);
} while (1);
}
static bool areTypeDeclsVisibleInLookupMode(LookupState LS) {
// Nested type declarations can be accessed only with unqualified lookup or
// on metatypes.
return !LS.isQualified() || LS.isOnMetatype();
}
static void lookupVisibleMemberDeclsImpl(
Type BaseTy, VisibleDeclConsumer &Consumer, const DeclContext *CurrDC,
LookupState LS, DeclVisibilityKind Reason, LazyResolver *TypeResolver,
VisitedSet &Visited) {
// Just look through l-valueness. It doesn't affect name lookup.
assert(BaseTy && "lookup into null type");
BaseTy = BaseTy->getRValueType();
// Handle metatype references, as in "some_type.some_member". These are
// special and can't have extensions.
if (auto MTT = BaseTy->getAs<AnyMetatypeType>()) {
// The metatype represents an arbitrary named type: dig through to the
// declared type to see what we're dealing with.
Type Ty = MTT->getInstanceType();
// Just perform normal dot lookup on the type see if we find extensions or
// anything else. For example, type SomeTy.SomeMember can look up static
// functions, and can even look up non-static functions as well (thus
// getting the address of the member).
lookupVisibleMemberDeclsImpl(Ty, Consumer, CurrDC,
LookupState::makeQualified().withOnMetatype(),
Reason, TypeResolver, Visited);
return;
}
// Lookup module references, as on some_module.some_member. These are
// special and can't have extensions.
if (ModuleType *MT = BaseTy->getAs<ModuleType>()) {
AccessFilteringDeclConsumer FilteringConsumer(CurrDC, Consumer,
TypeResolver);
MT->getModule()->lookupVisibleDecls(Module::AccessPathTy(),
FilteringConsumer,
NLKind::QualifiedLookup);
return;
}
// If the base is a protocol, enumerate its members.
if (ProtocolType *PT = BaseTy->getAs<ProtocolType>()) {
lookupVisibleProtocolMemberDecls(BaseTy, PT, Consumer, CurrDC, LS, Reason,
TypeResolver, Visited);
return;
}
// If the base is a protocol composition, enumerate members of the protocols.
if (auto PC = BaseTy->getAs<ProtocolCompositionType>()) {
for (auto Proto : PC->getProtocols())
lookupVisibleMemberDeclsImpl(Proto, Consumer, CurrDC, LS, Reason,
TypeResolver, Visited);
return;
}
// Enumerate members of archetype's requirements.
if (ArchetypeType *Archetype = BaseTy->getAs<ArchetypeType>()) {
for (auto Proto : Archetype->getConformsTo())
lookupVisibleProtocolMemberDecls(
BaseTy, Proto->getDeclaredType(), Consumer, CurrDC, LS,
getReasonForSuper(Reason), TypeResolver, Visited);
if (auto superclass = Archetype->getSuperclass())
lookupVisibleMemberDeclsImpl(superclass, Consumer, CurrDC, LS,
getReasonForSuper(Reason), TypeResolver,
Visited);
return;
}
do {
NominalTypeDecl *CurNominal = BaseTy->getAnyNominal();
if (!CurNominal)
break;
// Look in for members of a nominal type.
lookupTypeMembers(BaseTy, BaseTy, Consumer, CurrDC, LS, Reason,
TypeResolver);
lookupDeclsFromProtocolsBeingConformedTo(BaseTy, Consumer, LS, CurrDC,
Reason, TypeResolver, Visited);
// If we have a class type, look into its superclass.
ClassDecl *CurClass = dyn_cast<ClassDecl>(CurNominal);
if (CurClass && CurClass->hasSuperclass()) {
assert(BaseTy.getPointer() != CurClass->getSuperclass().getPointer() &&
"type is its own superclass");
BaseTy = CurClass->getSuperclass();
Reason = getReasonForSuper(Reason);
bool InheritsSuperclassInitializers =
CurClass->inheritsSuperclassInitializers(TypeResolver);
if (LS.isOnSuperclass() && !InheritsSuperclassInitializers)
LS = LS.withoutInheritsSuperclassInitializers();
else if (!LS.isOnSuperclass()) {
LS = LS.withOnSuperclass();
if (InheritsSuperclassInitializers)
LS = LS.withInheritsSuperclassInitializers();
}
} else {
break;
}
} while (1);
}
