diff options
Diffstat (limited to 'bridges/source/cpp_uno/gcc3_linux_aarch64/uno2cpp.cxx')
| -rw-r--r-- | bridges/source/cpp_uno/gcc3_linux_aarch64/uno2cpp.cxx | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/bridges/source/cpp_uno/gcc3_linux_aarch64/uno2cpp.cxx b/bridges/source/cpp_uno/gcc3_linux_aarch64/uno2cpp.cxx index d1928942eb06..760a7b38551d 100644 --- a/bridges/source/cpp_uno/gcc3_linux_aarch64/uno2cpp.cxx +++ b/bridges/source/cpp_uno/gcc3_linux_aarch64/uno2cpp.cxx @@ -187,9 +187,38 @@ void call( "C++ code threw unknown exception"); } } catch (css::uno::Exception &) { + __cxxabiv1::__cxa_exception * header = reinterpret_cast<__cxxabiv1::__cxa_eh_globals *>( + __cxxabiv1::__cxa_get_globals())->caughtExceptions; +#if !defined MACOSX && defined _LIBCPPABI_VERSION // detect libc++abi + // Very bad HACK to find out whether we run against a libcxxabi that has a new + // __cxa_exception::reserved member at the start, introduced with LLVM 10 + // <https://github.com/llvm/llvm-project/commit/674ec1eb16678b8addc02a4b0534ab383d22fa77> + // "[libcxxabi] Insert padding in __cxa_exception struct for compatibility". The layout of + // the start of __cxa_exception is + // + // [8 byte void *reserve] + // 8 byte size_t referenceCount + // + // where the (bad, hacky) assumption is that reserve (if present) is null + // (__cxa_allocate_exception in at least LLVM 11 zero-fills the object, and nothing actively + // sets reserve) while referenceCount is non-null (__cxa_throw sets it to 1, and + // __cxa_decrement_exception_refcount destroys the exception as soon as it drops to 0; for a + // __cxa_dependent_exception, the referenceCount member is rather + // + // 8 byte void* primaryException + // + // but which also will always be set to a non-null value in + // __cxa_rethrow_primary_exception). As described in the definition of __cxa_exception + // (bridges/source/cpp_uno/gcc3_linux_aarch64/abi.hxx), this hack (together with the + // "#ifdef MACOSX" there) can be dropped once we can be sure that we only run against new + // libcxxabi that has the reserve member: + if (*reinterpret_cast<void **>(header) == nullptr) { + header = reinterpret_cast<__cxxabiv1::__cxa_exception*>( + reinterpret_cast<void **>(header) + 1); + } +#endif abi_aarch64::mapException( - reinterpret_cast<__cxxabiv1::__cxa_eh_globals *>( - __cxxabiv1::__cxa_get_globals())->caughtExceptions, + header, __cxxabiv1::__cxa_current_exception_type(), *exception, proxy->getBridge()->getCpp2Uno()); for (sal_Int32 i = 0; i != count; ++i) { |