commit 6d4478e00de55071dec24373505afb27bf88cffc
author Reid Kleckner <rnk@google.com> Mon Feb 01 15:18:42 2021 -0800
committer Copybara-Service <copybara-worker@google.com> Fri Feb 05 01:26:51 2021 -0800
tree 99934b9d18b6e22caaca5c447f2524aa73f857ed
parent 7fcf40ebc548921e7bddeb58d458453957c6de90

Disable CFI in __get_elem to allow casting a pointer to uninitialized memory

Fixes usage of shared_ptr with CFI enabled, which is llvm.org/pr48993.

Differential Revision: https://reviews.llvm.org/D95827

GitOrigin-RevId: bab74864168bb5e28ecbc0294fe1095d8da7f569

include/memory

diff --git a/include/memory b/include/memory
index a00916c..39d0f5b 100644
--- a/include/memory
+++ b/include/memory
@@ -2647,7 +2647,7 @@
             _Alloc *__alloc = reinterpret_cast<_Alloc*>(__first);
             return __alloc;
         }
-        _Tp* __get_elem() _NOEXCEPT {
+        _LIBCPP_NO_CFI _Tp* __get_elem() _NOEXCEPT {
             _CompressedPair *__as_pair = reinterpret_cast<_CompressedPair*>(__blob_);
             typename _CompressedPair::_Base2* __second = _CompressedPair::__get_second_base(__as_pair);
             _Tp *__elem = reinterpret_cast<_Tp*>(__second);