[CFI] Disable CFI checks for __cxa_decrement_exception_refcount
Summary:
exception_header->exceptionDestructor is a void(*)(void*) function
pointer; however, it can point to destructors like std::
exception::~exception that don't match that type signature.
Reviewers: pcc, vitalybuka
Reviewed By: vitalybuka
Subscribers: kcc, christof, cfe-commits
Differential Revision: https://reviews.llvm.org/D45455
git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@329629 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__cxxabi_config.h b/include/__cxxabi_config.h
index 65b1961..46f5914 100644
--- a/include/__cxxabi_config.h
+++ b/include/__cxxabi_config.h
@@ -60,4 +60,14 @@
#define _LIBCXXABI_WEAK __attribute__((__weak__))
#endif
+#if defined(__clang__)
+#define _LIBCXXABI_COMPILER_CLANG
+#endif
+
+#if __has_attribute(__no_sanitize__) && defined(_LIBCXXABI_COMPILER_CLANG)
+#define _LIBCXXABI_NO_CFI __attribute__((__no_sanitize__("cfi")))
+#else
+#define _LIBCXXABI_NO_CFI
+#endif
+
#endif // ____CXXABI_CONFIG_H
diff --git a/src/cxa_exception.cpp b/src/cxa_exception.cpp
index b77f3a8..679c32f 100644
--- a/src/cxa_exception.cpp
+++ b/src/cxa_exception.cpp
@@ -630,8 +630,8 @@
Requires: If thrown_object is not NULL, it is a native exception.
*/
-void
-__cxa_decrement_exception_refcount(void *thrown_object) throw() {
+_LIBCXXABI_NO_CFI
+void __cxa_decrement_exception_refcount(void *thrown_object) throw() {
if (thrown_object != NULL )
{
__cxa_exception* exception_header = cxa_exception_from_thrown_object(thrown_object);
