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This inlines most members of std::exception_ptr so that all operations on a null exception_ptr can be optimized away. This benefits code like std::future and coroutines where an exception_ptr object is present to cope with exceptional cases, but is usually not used and remains null. Since those functions were previously non-inline we have to continue to export them from the library, for objects that were compiled against the old headers and expect to find definitions in the library. In order to inline the copy constructor and destructor we need to export the _M_addref() and _M_release() members that increment/decrement the reference count when copying/destroying a non-null exception_ptr. The copy ctor and dtor check for null and don't call _M_addref and _M_release unless they need to. The checks for null pointers in _M_addref and _M_release are still needed because old code might call them without checking for null first. But we can use __builtin_expect to predict that they are usually called for the non-null case. libstdc++-v3/ChangeLog: PR libstdc++/90295 * config/abi/pre/gnu.ver (CXXABI_1.3.13): New symbol version. (exception_ptr::_M_addref(), exception_ptr::_M_release()): Export symbols. * libsupc++/eh_ptr.cc (exception_ptr::exception_ptr()): Remove out-of-line definition. (exception_ptr::exception_ptr(const exception_ptr&)): Likewise. (exception_ptr::~exception_ptr()): Likewise. (exception_ptr::operator=(const exception_ptr&)): Likewise. (exception_ptr::swap(exception_ptr&)): Likewise. (exception_ptr::_M_addref()): Add branch prediction. * libsupc++/exception_ptr.h (exception_ptr::operator bool): Add noexcept. [!_GLIBCXX_EH_PTR_COMPAT] (operator==, operator!=): Define inline as hidden friends. Remove declarations at namespace scope. (exception_ptr::exception_ptr()): Define inline. (exception_ptr::exception_ptr(const exception_ptr&)): Likewise. (exception_ptr::~exception_ptr()): Likewise. (exception_ptr::operator=(const exception_ptr&)): Likewise. (exception_ptr::swap(exception_ptr&)): Likewise. * testsuite/util/testsuite_abi.cc: Add CXXABI_1.3.13. * testsuite/18_support/exception_ptr/90295.cc: New test.
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