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Runtime: Walk up superclass chains to find class conformances.

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Swift SVN r23065
This commit is contained in:
Joe Groff
2014-11-02 15:41:00 +00:00
parent 4ad4b2db46
commit 01554448fc
8 changed files with 109 additions and 29 deletions
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18
stdlib/runtime/Casting.cpp
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@@ -1737,10 +1737,14 @@ const void *swift::swift_conformsToProtocol2(const Metadata *type,
_dyld_register_func_for_add_image(_addImageProtocolConformances);
});
auto origType = type;
recur:
// See if we have a cached conformance.
// Try the specific type first.
pthread_rwlock_rdlock(&ConformanceCacheLock);
recur_inside_cache_lock:
auto found = ConformanceCache.find({type, protocol});
if (found != ConformanceCache.end()) {
auto entry = found->second;
@@ -1771,6 +1775,17 @@ recur:
// patterns.
}
}
// If the type is a class, try its superclass.
if (const ClassMetadata *classType = type->getClassObject()) {
if (auto super = classType->SuperClass) {
if (super != getRootSuperclass()) {
type = swift_getObjCClassMetadata(super);
goto recur_inside_cache_lock;
}
}
}
pthread_rwlock_unlock(&ConformanceCacheLock);
// If we didn't have an up-to-date cache entry, scan the conformance records.
@@ -1821,7 +1836,8 @@ recur:
pthread_rwlock_unlock(&ConformanceCacheLock);
pthread_mutex_unlock(&SectionsToScanLock);
// Try again with our newly-populated cache.
// Start over with our newly-populated cache.
type = origType;
goto recur;
}