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Implement basic support for [weak].

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Swift SVN r7041
This commit is contained in:
John McCall
2013-08-08 04:04:51 +00:00
parent 204980bdfd
commit 14cb7001b3
20 changed files with 887 additions and 110 deletions
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40
stdlib/runtime/Alloc.cpp
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@@ -441,8 +441,33 @@ extern "C" bool swift_isUniquelyReferenced(HeapObject *object) {
return result;
}
void swift::swift_weakInit(WeakReference *ref) {
ref->Value = nullptr;
void swift::swift_weakInit(WeakReference *ref, HeapObject *value) {
ref->Value = value;
swift_weakRetain(value);
}
void swift::swift_weakAssign(WeakReference *ref, HeapObject *newValue) {
swift_weakRetain(newValue);
auto oldValue = ref->Value;
ref->Value = newValue;
swift_weakRelease(oldValue);
}
HeapObject *swift::swift_weakLoadStrong(WeakReference *ref) {
auto object = ref->Value;
if (object == nullptr) return nullptr;
if (object->refCount & RC_DEALLOCATING_BIT) {
swift_weakRelease(object);
ref->Value = nullptr;
return nullptr;
}
return swift_tryRetain(object);
}
HeapObject *swift::swift_weakTakeStrong(WeakReference *ref) {
auto result = swift_weakLoadStrong(ref);
swift_weakDestroy(ref);
return result;
}
void swift::swift_weakDestroy(WeakReference *ref) {
@@ -488,17 +513,6 @@ void swift::swift_weakTakeAssign(WeakReference *dest, WeakReference *src) {
swift_weakTakeInit(dest, src);
}
HeapObject *swift::swift_weakTryRetain(WeakReference *ref) {
auto object = ref->Value;
if (object == nullptr) return nullptr;
if (object->refCount & RC_DEALLOCATING_BIT) {
swift_weakRelease(object);
ref->Value = nullptr;
return nullptr;
}
return swift_tryRetain(object);
}
void swift::_swift_abortRetainUnowned(const void *object) {
fprintf(stderr, "attempting to retain deallocated object at %p", object);
abort();