libcxx: Mark __temp_value::__temp_value as _LIBCPP_NO_CFI.
This constructor needs to cast a pointer to uninitialized
memory to a pointer to object type in order to call
allocator_traits::construct(). This cast is not allowed when CFI cast
checks are enabled.
I did this instead of marking __addr() as _LIBCPP_NO_CFI so that we
don't lose CFI checks on get() or the dtor.
Differential Revision: https://reviews.llvm.org/D50743
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@339797 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/memory b/include/memory
index a4bf89b..4b7a26c 100644
--- a/include/memory
+++ b/include/memory
@@ -5631,8 +5631,11 @@
_Tp & get() { return *__addr(); }
template<class... _Args>
- __temp_value(_Alloc &__alloc, _Args&& ... __args) : __a(__alloc)
- { _Traits::construct(__a, __addr(), _VSTD::forward<_Args>(__args)...); }
+ _LIBCPP_NO_CFI
+ __temp_value(_Alloc &__alloc, _Args&& ... __args) : __a(__alloc) {
+ _Traits::construct(__a, reinterpret_cast<_Tp*>(addressof(__v)),
+ _VSTD::forward<_Args>(__args)...);
+ }
~__temp_value() { _Traits::destroy(__a, __addr()); }
};