Merge "libutils: ~RefBase more logs" am: 83785021

// log all reference counting operations

#define PRINT_REFS 0

// Continue after logging a stack trace if ~RefBase discovers that reference

// count has never been incremented. Normally we conspicuously crash in that

// case.

#define DEBUG_REFBASE_DESTRUCTION 1

#if !defined(_WIN32) && !defined(__APPLE__)

// CallStack is only supported on linux type platforms.

#define CALLSTACK_ENABLED 1

        }

    } else if (mRefs->mStrong.load(std::memory_order_relaxed) == INITIAL_STRONG_VALUE) {

        // We never acquired a strong reference on this object.

#if DEBUG_REFBASE_DESTRUCTION

        // Treating this as fatal is prone to causing boot loops. For debugging, it's

        // better to treat as non-fatal.

        ALOGD("RefBase: Explicit destruction, weak count = %d (in %p)", mRefs->mWeak.load(), this);

        // TODO: make this fatal, but too much code in Android manages RefBase with

        // new/delete manually (or using other mechanisms such as std::make_unique).

        // However, this is dangerous because it's also common for code to use the

        // sp<T>(T*) constructor, assuming that if the object is around, it is already

        // owned by an sp<>.

        ALOGW("RefBase: Explicit destruction, weak count = %d (in %p). Use sp<> to manage this "

              "object.",

              mRefs->mWeak.load(), this);

#if CALLSTACK_ENABLED

        CallStack::logStack(LOG_TAG);

#endif

#else

        LOG_ALWAYS_FATAL("RefBase: Explicit destruction, weak count = %d", mRefs->mWeak.load());

#endif

    }

    // For debugging purposes, clear mRefs.  Ineffective against outstanding wp's.