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Add objc_retainAutoreleasedReturnValue() #10355

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Add objc_retainAutoreleasedReturnValue() #10355

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20 changes: 20 additions & 0 deletions stdlib/public/runtime/HeapObject.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -292,6 +292,26 @@ void SWIFT_RT_ENTRY_IMPL(swift_nonatomic_retain_n)(HeapObject *object, uint32_t
object->refCounts.incrementNonAtomic(n);
}

#if !SWIFT_OBJC_INTEROP

// For CF functions with 'Get' semantics, the compiler currently assumes that
// the result is autoreleased and must be retained. It does so on all platforms
// by emitting a call to objc_retainAutoreleasedReturnValue. On Darwin, this is
// implemented by the ObjC runtime. On Linux, there is no runtime, and therefore
// we have to stub it out here ourselves. The compiler will eventually call
// swift_release to balance the retain below. This is a workaround until the
// compiler no longer emits this callout on Linux.
SWIFT_RT_ENTRY_VISIBILITY
extern "C"
void *objc_retainAutoreleasedReturnValue(HeapObject *obj) {
if (obj) {
swift::swift_retain(obj);
return obj;
}
else return NULL;
}
#endif

void swift::swift_release(HeapObject *object)
SWIFT_CC(RegisterPreservingCC_IMPL) {
SWIFT_RT_ENTRY_REF(swift_release)(object);
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