[libc++] Rename __libcpp_assertion_handler to __libcpp_verbose_abort

With the goal of reusing that handler to do other things besides
handling assertions (such as terminating when an exception is thrown
under -fno-exceptions), the name `__libcpp_assertion_handler` doesn't
really make sense anymore.

Furthermore, I didn't want to use the name `__libcpp_abort_handler`,
since that would give the impression that the handler is called
whenever `std::abort()` is called, which is not the case at all.

Differential Revision: https://reviews.llvm.org/D130562

libcxx/docs/UsingLibcxx.rst

@@ -152,28 +152,28 @@ where the static or shared library was compiled **with** assertions but the user
 disable them). However, most of the code in libc++ is in the headers, so the user-selected
 value for ``_LIBCPP_ENABLE_ASSERTIONS`` (if any) will usually be respected.
 
-When an assertion fails, an assertion handler function is called. The library provides a default
-assertion handler that prints an error message and calls ``std::abort()``. Note that this assertion
-handler is provided by the static or shared library, so it is only available when deploying to a
-platform where the compiled library is sufficiently recent. However, users can also override that
-assertion handler with their own, which can be useful to provide custom behavior, or when deploying
-to older platforms where the default assertion handler isn't available.
+When an assertion fails, the program is aborted through a special verbose termination function. The
+library provides a default function that prints an error message and calls ``std::abort()``. Note
+that this function is provided by the static or shared library, so it is only available when deploying
+to a platform where the compiled library is sufficiently recent. However, users can also override that
+function with their own, which can be useful to provide custom behavior, or when deploying to older
+platforms where the default function isn't available.
 
-Replacing the default assertion handler is done by defining the following function:
+Replacing the default verbose termination function is done by defining the following function:
 
 .. code-block:: cpp
 
-  void __libcpp_assertion_handler(char const* format, ...)
+  void __libcpp_verbose_abort(char const* format, ...)
 
 This mechanism is similar to how one can replace the default definition of ``operator new``
 and ``operator delete``. For example:
 
 .. code-block:: cpp
 
   // In HelloWorldHandler.cpp
-  #include <version> // must include any libc++ header before defining the handler (C compatibility headers excluded)
+  #include <version> // must include any libc++ header before defining the function (C compatibility headers excluded)
 
-  void std::__libcpp_assertion_handler(char const* format, ...) {
+  void std::__libcpp_verbose_abort(char const* format, ...) {
     va_list list;
     va_start(list, format);
     std::vfprintf(stderr, format, list);
@@ -187,30 +187,29 @@ and ``operator delete``. For example:
 
   int main() {
     std::vector<int> v;
-    int& x = v[0]; // Your assertion handler will be called here if _LIBCPP_ENABLE_ASSERTIONS=1
+    int& x = v[0]; // Your termination function will be called here if _LIBCPP_ENABLE_ASSERTIONS=1
   }
 
-Also note that the assertion handler should usually not return. Since the assertions in libc++
-catch undefined behavior, your code will proceed with undefined behavior if your assertion
-handler is called and does return.
-
-Furthermore, throwing an exception from the assertion handler is not recommended. Indeed, many
-functions in the library are ``noexcept``, and any exception thrown from the assertion handler
-will result in ``std::terminate`` being called.
-
-Back-deploying with a custom assertion handler
-----------------------------------------------
-When deploying to an older platform that does not provide a default assertion handler, the
-compiler will diagnose the usage of ``std::__libcpp_assertion_handler`` with an error. This
-is done to avoid the load-time error that would otherwise happen if the code was being deployed
-on the older system.
-
-If you are providing a custom assertion handler, this error is effectively a false positive.
-To let the library know that you are providing a custom assertion handler in back-deployment
-scenarios, you must define the ``_LIBCPP_AVAILABILITY_CUSTOM_ASSERTION_HANDLER_PROVIDED`` macro,
-and the library will assume that you are providing your own definition. If no definition is
-provided and the code is back-deployed to the older platform, it will fail to load when the
-dynamic linker fails to find a definition for ``std::__libcpp_assertion_handler``, so you
+Also note that the verbose termination function should never return. Since assertions in libc++
+catch undefined behavior, your code will proceed with undefined behavior if your function is called
+and does return.
+
+Furthermore, exceptions should not be thrown from the function. Indeed, many functions in the
+library are ``noexcept``, and any exception thrown from the termination function will result
+in ``std::terminate`` being called.
+
+Back-deploying with a custom verbose termination function
+---------------------------------------------------------
+When deploying to an older platform that does not provide a default verbose termination function,
+the compiler will diagnose the usage of ``std::__libcpp_verbose_abort`` with an error. This is done
+to avoid the load-time error that would otherwise happen if the code was being deployed on older
+systems.
+
+If you are providing a custom verbose termination function, this error is effectively a false positive.
+To let the library know that you are providing a custom function in back-deployment scenarios, you must
+define the ``_LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED`` macro, and the library will assume that
+you are providing your own definition. If no definition is provided and the code is back-deployed to an older
+platform, it will fail to load when the dynamic linker fails to find a definition of the function, so you
 should only remove the guard rails if you really mean it!
 
 Libc++ Configuration Macros

libcxx/include/CMakeLists.txt

@@ -637,6 +637,7 @@ set(files
   __utility/transaction.h
   __utility/unreachable.h
   __variant/monostate.h
+  __verbose_abort
   algorithm
   any
   array

libcxx/include/__assert

@@ -10,8 +10,8 @@
 #ifndef _LIBCPP___ASSERT
 #define _LIBCPP___ASSERT
 
-#include <__availability>
 #include <__config>
+#include <__verbose_abort>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -45,7 +45,7 @@
 # define _LIBCPP_ASSERT(expression, message)                                        \
     (__builtin_expect(static_cast<bool>(expression), 1) ?                           \
       (void)0 :                                                                     \
-      ::std::__libcpp_assertion_handler("%s:%d: assertion %s failed: %s", __FILE__, __LINE__, #expression, message))
+      ::std::__libcpp_verbose_abort("%s:%d: assertion %s failed: %s", __FILE__, __LINE__, #expression, message))
 #elif !defined(_LIBCPP_ASSERTIONS_DISABLE_ASSUME) && __has_builtin(__builtin_assume)
 # define _LIBCPP_ASSERT(expression, message)                                        \
     (_LIBCPP_DIAGNOSTIC_PUSH                                                        \
@@ -56,11 +56,4 @@
 # define _LIBCPP_ASSERT(expression, message) ((void)0)
 #endif
 
-_LIBCPP_BEGIN_NAMESPACE_STD
-
-_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_ASSERTION_HANDLER _LIBCPP_ATTRIBUTE_FORMAT(__printf__, 1, 2)
-void __libcpp_assertion_handler(const char *__format, ...);
-
-_LIBCPP_END_NAMESPACE_STD
-
 #endif // _LIBCPP___ASSERT

libcxx/include/__availability

@@ -156,22 +156,21 @@
 #   define _LIBCPP_AVAILABILITY_FORMAT
 // #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format
 
-    // This controls whether the std::__libcpp_assertion_handler default
-    // assertion handler is provided by the library.
+    // This controls whether the default verbose termination function is
+    // provided by the library.
     //
-    // Note that when users provide their own custom assertion handler,
-    // it doesn't matter whether the dylib provides a default handler,
-    // and the availability markup can actually give a false positive
-    // diagnostic (it will think that no handler is provided, when in
-    // reality the user has provided their own).
+    // Note that when users provide their own custom function, it doesn't
+    // matter whether the dylib provides a default function, and the
+    // availability markup can actually give a false positive diagnostic
+    // (it will think that no function is provided, when in reality the
+    // user has provided their own).
     //
-    // Users can pass -D_LIBCPP_AVAILABILITY_CUSTOM_ASSERTION_HANDLER_PROVIDED
+    // Users can pass -D_LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED
     // to the compiler to tell the library to ignore the fact that the
-    // default handler isn't available on their deployment target. Note that
-    // defining this macro but failing to define a custom assertion handler
-    // will lead to a load-time error on back-deployment targets, so it
-    // should be avoided.
-#   define _LIBCPP_AVAILABILITY_DEFAULT_ASSERTION_HANDLER
+    // default function isn't available on their deployment target. Note that
+    // defining this macro but failing to define a custom function will lead to
+    // a load-time error on back-deployment targets, so it should be avoided.
+#   define _LIBCPP_AVAILABILITY_DEFAULT_VERBOSE_ABORT
 
 #elif defined(__APPLE__)
 
@@ -272,7 +271,7 @@
         __attribute__((unavailable))
 #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format
 
-#   define _LIBCPP_AVAILABILITY_DEFAULT_ASSERTION_HANDLER                       \
+#   define _LIBCPP_AVAILABILITY_DEFAULT_VERBOSE_ABORT                  \
         __attribute__((unavailable))
 #else
 
@@ -297,14 +296,14 @@
 #   define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS  _LIBCPP_AVAILABILITY_BAD_VARIANT_ACCESS
 #endif
 
-// Define the special assertion handler availability attribute, which can be silenced by
-// users if they provide their own custom assertion handler. The rest of the code should
-// not use the *_DEFAULT_* macro directly, since that would make it ignore the fact that
-// the user provided a custom handler.
-#if defined(_LIBCPP_AVAILABILITY_CUSTOM_ASSERTION_HANDLER_PROVIDED)
-#   define _LIBCPP_AVAILABILITY_ASSERTION_HANDLER /* nothing */
+// Define the special verbose termination function availability attribute, which can be silenced by
+// users if they provide their own custom function. The rest of the code should not use the
+// *_DEFAULT_* macro directly, since that would make it ignore the fact that the user provided
+// a custom function.
+#if defined(_LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED)
+#   define _LIBCPP_AVAILABILITY_VERBOSE_ABORT /* nothing */
 #else
-#   define _LIBCPP_AVAILABILITY_ASSERTION_HANDLER _LIBCPP_AVAILABILITY_DEFAULT_ASSERTION_HANDLER
+#   define _LIBCPP_AVAILABILITY_VERBOSE_ABORT _LIBCPP_AVAILABILITY_DEFAULT_VERBOSE_ABORT
 #endif
 
 #endif // _LIBCPP___AVAILABILITY

libcxx/include/__verbose_abort

@@ -0,0 +1,27 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___VERBOSE_ABORT
+#define _LIBCPP___VERBOSE_ABORT
+
+#include <__availability>
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_VERBOSE_ABORT _LIBCPP_ATTRIBUTE_FORMAT(__printf__, 1, 2)
+void __libcpp_verbose_abort(const char *__format, ...);
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___VERBOSE_ABORT

libcxx/include/module.modulemap.in

@@ -1294,6 +1294,7 @@ module std [system] {
   module __tree              {         header "__tree"              export * }
   module __tuple             { private header "__tuple"             export * }
   module __undef_macros      {         header "__undef_macros"      export * }
+  module __verbose_abort     {         header "__verbose_abort"     export * }
 
   module experimental {
     requires cplusplus11

libcxx/lib/abi/CHANGELOG.TXT

@@ -64,7 +64,7 @@ Version 15.0
   Symbol removed: _ZTSNSt3__18__c_nodeE
   Symbol removed: _ZTVNSt3__18__c_nodeE
 
-* b0fd9497af6d and 7de5aca84c54 - [libc++] Add a lightweight overridable assertion handler
+* b0fd9497af6d, 7de5aca84c54 and XXXXXXXX - [libc++] Add a lightweight overridable assertion handler
 
   This patch adds a lightweight assertion handler mechanism that can be
   overriden at link-time in a fashion similar to `operator new`. A default
@@ -73,7 +73,7 @@ Version 15.0
 
   All platforms
   -------------
-  Symbol added: _ZNSt3__126__libcpp_assertion_handlerEPKcz
+  Symbol added: _ZNSt3__122__libcpp_verbose_abortEPKcz
 
 ------------
 Version 14.0

libcxx/lib/abi/arm64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist

@@ -1534,7 +1534,7 @@
 {'is_defined': True, 'name': '__ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__123__libcpp_atomic_monitorEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__126__libcpp_assertion_handlerEPKcz', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__122__libcpp_verbose_abortEPKcz', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'type': 'FUNC'}

libcxx/lib/abi/powerpc-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist

@@ -1678,7 +1678,7 @@
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__126__libcpp_assertion_handlerEPKcz', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
+{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__122__libcpp_verbose_abortEPKcz', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}

libcxx/lib/abi/powerpc64-ibm-aix.libcxxabi.v1.stable.exceptions.nonew.abilist

@@ -1678,7 +1678,7 @@
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__118basic_stringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__119basic_istringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__119basic_ostringstreamIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
-{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__126__libcpp_assertion_handlerEPKcz', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
+{'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__122__libcpp_verbose_abortEPKcz', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}

libcxx/lib/abi/x86_64-apple-darwin.libcxxabi.v1.stable.exceptions.nonew.abilist

@@ -1534,7 +1534,7 @@
 {'is_defined': True, 'name': '__ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__123__libcpp_atomic_monitorEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '__ZNSt3__126__libcpp_assertion_handlerEPKcz', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNSt3__122__libcpp_verbose_abortEPKcz', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'type': 'FUNC'}

libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.exceptions.nonew.abilist

@@ -1225,7 +1225,7 @@
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__126__libcpp_assertion_handlerEPKcz', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZNSt3__122__libcpp_verbose_abortEPKcz', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'type': 'FUNC'}

libcxx/lib/abi/x86_64-unknown-linux-gnu.libcxxabi.v1.stable.noexceptions.nonew.abilist

@@ -1197,7 +1197,7 @@
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_atomic_monitorEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__126__libcpp_assertion_handlerEPKcz', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZNSt3__122__libcpp_verbose_abortEPKcz', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIaaEEPaEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIccEEPcEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIddEEPdEEbT0_S5_T_', 'type': 'FUNC'}

libcxx/src/CMakeLists.txt

@@ -4,7 +4,6 @@ set(LIBCXX_LIB_CMAKEFILES_DIR "${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTOR
 set(LIBCXX_SOURCES
   algorithm.cpp
   any.cpp
-  assert.cpp
   atomic.cpp
   barrier.cpp
   bind.cpp
@@ -62,6 +61,7 @@ set(LIBCXX_SOURCES
   valarray.cpp
   variant.cpp
   vector.cpp
+  verbose_abort.cpp
   )
 
 if (LIBCXX_ENABLE_DEBUG_MODE OR LIBCXX_ENABLE_BACKWARDS_COMPATIBILITY_DEBUG_MODE_SYMBOLS)

libcxx/src/assert.cpp → libcxx/src/verbose_abort.cpp

@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include <__assert>
 #include <__config>
+#include <__verbose_abort>
 #include <cstdarg>
 #include <cstdio>
 #include <cstdlib>
@@ -29,7 +29,7 @@ extern "C" void android_set_abort_message(const char* msg);
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 _LIBCPP_WEAK
-void __libcpp_assertion_handler(char const* format, ...) {
+void __libcpp_verbose_abort(char const* format, ...) {
   // Write message to stderr. We do this before formatting into a
   // buffer so that we still get some information out if that fails.
   {