SubclassScope SILDeclRef::getSubclassScope() const {
if (!hasDecl())
return SubclassScope::NotApplicable;
// If this declaration is a function which goes into a vtable, then it's
// symbol must be as visible as its class. Derived classes even have to put
// all less visible methods of the base class into their vtables.
auto *FD = dyn_cast<AbstractFunctionDecl>(getDecl());
if (!FD)
return SubclassScope::NotApplicable;
DeclContext *context = FD->getDeclContext();
// Methods from extensions don't go into vtables (yet).
if (context->isExtensionContext())
return SubclassScope::NotApplicable;
// Various forms of thunks don't either.
if (isThunk() || isForeign)
return SubclassScope::NotApplicable;
// Default arg generators only need to be visible in Swift 3.
if (isDefaultArgGenerator() && !context->getASTContext().isSwiftVersion3())
return SubclassScope::NotApplicable;
auto *classType = context->getSelfClassDecl();
if (!classType || classType->isFinal())
return SubclassScope::NotApplicable;
if (FD->isFinal())
return SubclassScope::NotApplicable;
assert(FD->getEffectiveAccess() <= classType->getEffectiveAccess() &&
"class must be as visible as its members");
switch (classType->getEffectiveAccess()) {
case AccessLevel::Private:
case AccessLevel::FilePrivate:
return SubclassScope::NotApplicable;
case AccessLevel::Internal:
case AccessLevel::Public:
return SubclassScope::Internal;
case AccessLevel::Open:
return SubclassScope::External;
}
llvm_unreachable("Unhandled access level in switch.");
}
static SILFunction::ClassVisibility_t getClassVisibility(SILDeclRef constant) {
if (!constant.hasDecl())
return SILFunction::NotRelevant;
// If this declaration is a function which goes into a vtable, then it's
// symbol must be as visible as its class. Derived classes even have to put
// all less visible methods of the base class into their vtables.
auto *FD = dyn_cast<AbstractFunctionDecl>(constant.getDecl());
if (!FD)
return SILFunction::NotRelevant;
DeclContext *context = FD->getDeclContext();
// Methods from extensions don't go into vtables (yet).
if (context->isExtensionContext())
return SILFunction::NotRelevant;
auto *classType = context->getAsClassOrClassExtensionContext();
if (!classType || classType->isFinal())
return SILFunction::NotRelevant;
if (FD->isFinal() && !FD->getOverriddenDecl())
return SILFunction::NotRelevant;
assert(FD->getEffectiveAccess() <= classType->getEffectiveAccess() &&
"class must be as visible as its members");
switch (classType->getEffectiveAccess()) {
case Accessibility::Private:
case Accessibility::FilePrivate:
return SILFunction::NotRelevant;
case Accessibility::Internal:
return SILFunction::InternalClass;
case Accessibility::Public:
case Accessibility::Open:
return SILFunction::PublicClass;
}
llvm_unreachable("Unhandled Accessibility in switch.");
}