[libc++] Rename __libcpp_assertion_handler to __libcpp_verbose_abort

[ldionne]

Summary

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.

[ldionne]

Don't mark the function as noreturn since it makes it impossible to test.

[ldionne]

Try to fix modular build.

[ldionne]

Fix backdeployment test

[ldionne]

Some additional information on this patch like I just explained in Discord:

I want to use a verbose abort handler in more places, like when we std::abort due to an exception in -fno-exceptions mode (today the experience sucks cause it only calls std::abort() with no message, so good luck finding where an exception was thrown). In the future, we can also most likely call it from std::unreachable(). It would also allow de-duplicating the same functionality we have in libc++abi.

I have to admit that given this generality, I'm not 100% sure anymore it is worth making it possible for users to override the function, although I guess it doesn't add too much complexity. I'd welcome input on this question and also the naming of the function, documentation changes, etc.

[Mordante]

In general LGTM!

I like the idea of using one function for all these ways to terminate the application.

However I'm not thrilled by the name, especially the verbose part. How do you feel about __libcpp_terminate_handler? (I know it's somewhat close to std::terminate.) Another suggestion __libcpp_fatal_error_handler.
However I don't want to make this a bikeshed, so when no better name is found I won't object against the proposed name.

libcxx/docs/UsingLibcxx.rst

213

[philnik]

I'm not really a fan of the name, but I don't have a better idea. So this LGTM % nit.

libcxx/docs/UsingLibcxx.rst

225–226

[ldionne]

In D130562#3680877, @Mordante wrote:

In general LGTM!

I like the idea of using one function for all these ways to terminate the application.

However I'm not thrilled by the name, especially the verbose part. How do you feel about __libcpp_terminate_handler?

There is already std::terminate_handler which does something really different. That's one of the reasons I want to keep handler out of the name, because I don't want folks to get the impression that this is called when std::abort is called, which is not the case. Instead, it's the other way around -- this function will call std::abort after adding some additional information.

In fact, this makes me realize that I should probably drop any mention of a "handler" in the documentation as well.

[ldionne]

Address comments, drop mentions of "handler".

[ldionne]

Drop more mentions of handler.

[ldionne]

Will ship once CI is green.

[Mordante]

In D130562#3687347, @ldionne wrote:

In D130562#3680877, @Mordante wrote:

In general LGTM!

I like the idea of using one function for all these ways to terminate the application.

However I'm not thrilled by the name, especially the verbose part. How do you feel about __libcpp_terminate_handler?

There is already std::terminate_handler which does something really different. That's one of the reasons I want to keep handler out of the name, because I don't want folks to get the impression that this is called when std::abort is called, which is not the case. Instead, it's the other way around -- this function will call std::abort after adding some additional information.

sounds good to me, and as said I don't want to start bikeshedding. So LGTM!

libcxx/docs/UsingLibcxx.rst

 including any libc++ header (we recommend passing ``-D_LIBCPP_ENABLE_ASSERTIONS=X`` to the
 compiler). Note that if the compiled library was built by the vendor without assertions,
 functions compiled inside the static or shared library won't have assertions enabled even
 if the user defines ``_LIBCPP_ENABLE_ASSERTIONS=1`` (the same is true for the inverse case
 where the static or shared library was compiled **with** assertions but the user tries to
 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);
     va_end(list);
 
     std::abort();
   }
 
   // In HelloWorld.cpp
   #include <vector>
 
   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
 ===========================
 
 Libc++ provides a number of configuration macros which can be used to enable
 or disable extended libc++ behavior, including enabling "debug mode" or
 thread safety annotations.
 
 **_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS**:
   This macro is used to enable -Wthread-safety annotations on libc++'s
   ``std::mutex`` and ``std::lock_guard``. By default, these annotations are
   disabled and must be manually enabled by the user.
 
 **_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS**:
   This macro is used to disable all visibility annotations inside libc++.
   Defining this macro and then building libc++ with hidden visibility gives a
   build of libc++ which does not export any symbols, which can be useful when
   building statically for inclusion into another library.
 
 **_LIBCPP_DISABLE_ADDITIONAL_DIAGNOSTICS**:
   This macro disables the additional diagnostics generated by libc++ using the

libcxx/include/CMakeLists.txt

set(files
   __utility/piecewise_construct.h
   __utility/priority_tag.h
   __utility/rel_ops.h
   __utility/swap.h
   __utility/to_underlying.h
   __utility/transaction.h
   __utility/unreachable.h
   __variant/monostate.h
+  __verbose_abort
   algorithm
   any
   array
   atomic
   barrier
   bit
   bitset
   cassert

libcxx/include/__assert

 // -*- 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___ASSERT
 #define _LIBCPP___ASSERT
 
-#include <__availability>
 #include <__config>
+#include <__verbose_abort>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
 #endif
 
 // This is for backwards compatibility with code that might have been enabling
 // assertions through the Debug mode previously.
 // TODO: In LLVM 16, make it an error to define _LIBCPP_DEBUG

 #if _LIBCPP_ENABLE_ASSERTIONS != 0 && _LIBCPP_ENABLE_ASSERTIONS != 1
 # error "_LIBCPP_ENABLE_ASSERTIONS must be set to 0 or 1"
 #endif
 
 #if _LIBCPP_ENABLE_ASSERTIONS
 # 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                                                        \
     _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wassume")                                    \
     __builtin_assume(static_cast<bool>(expression))                                 \
     _LIBCPP_DIAGNOSTIC_POP)
 #else
 # 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

// #   define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore
 
     // This controls the availability of the C++20 format library.
     // The library is in development and not ABI stable yet. P2216 is
     // retroactively accepted in C++20. This paper contains ABI breaking
     // changes.
 #   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__)
 
 #   define _LIBCPP_AVAILABILITY_SHARED_MUTEX                                    \
         __attribute__((availability(macos,strict,introduced=10.12)))            \
         __attribute__((availability(ios,strict,introduced=10.0)))               \
         __attribute__((availability(tvos,strict,introduced=10.0)))              \
         __attribute__((availability(watchos,strict,introduced=3.0)))

 #       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch
 #       define _LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore
 #   endif
 
 #   define _LIBCPP_AVAILABILITY_FORMAT                                          \
         __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
 
 // ...New vendors can add availability markup here...
 
 #   error "It looks like you're trying to enable vendor availability markup, but you haven't defined the corresponding macros yet!"
 
 #endif
 
 // Define availability attributes that depend on _LIBCPP_NO_EXCEPTIONS.
 // Those are defined in terms of the availability attributes above, and
 // should not be vendor-specific.
 #if defined(_LIBCPP_NO_EXCEPTIONS)
 #   define _LIBCPP_AVAILABILITY_FUTURE
 #   define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST
 #   define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS
 #   define _LIBCPP_AVAILABILITY_THROW_BAD_VARIANT_ACCESS
 #else
 #   define _LIBCPP_AVAILABILITY_FUTURE                    _LIBCPP_AVAILABILITY_FUTURE_ERROR
 #   define _LIBCPP_AVAILABILITY_THROW_BAD_ANY_CAST        _LIBCPP_AVAILABILITY_BAD_ANY_CAST
 #   define _LIBCPP_AVAILABILITY_THROW_BAD_OPTIONAL_ACCESS _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS
 #   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

+// -*- 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

   module __std_stream        {
     @requires_LIBCXX_ENABLE_LOCALIZATION@
     private header "__std_stream" export *
   }
   module __threading_support {         header "__threading_support" export * }
   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
 
     module algorithm {
       header "experimental/algorithm"
       export *
     }

libcxx/lib/abi/CHANGELOG.TXT

* f1c30135417f - [libc++] Drop the legacy debug mode symbols by default
   Symbol removed: _ZNSt3__18__c_nodeD2Ev
   Symbol removed: _ZNSt3__18__get_dbEv
   Symbol removed: _ZNSt3__18__i_nodeD1Ev
   Symbol removed: _ZNSt3__18__i_nodeD2Ev
   Symbol removed: _ZTINSt3__18__c_nodeE
   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
   assertion handler is provided in the shared library, hence the added
   symbol.
 
   All platforms
   -------------
-  Symbol added: _ZNSt3__126__libcpp_assertion_handlerEPKcz
+  Symbol added: _ZNSt3__122__libcpp_verbose_abortEPKcz
 
 ------------
 Version 14.0
 ------------
 
 * abb5dd6e99df - [libc++] `to_chars` for floating point.
 
   This commit added the `to_chars` implementation for floating point values.

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

 {'is_defined': True, 'name': '__ZNSt3__121undeclare_no_pointersEPcm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__123__cxx_atomic_notify_allEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__123__cxx_atomic_notify_allEPVKv', 'type': 'FUNC'}
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+{'is_defined': True, 'name': '__ZNSt3__122__libcpp_verbose_abortEPKcz', 'type': 'FUNC'}
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 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'type': 'FUNC'}

 {'is_defined': True, 'name': '___cxa_vec_delete2', 'type': 'I'}
 {'is_defined': True, 'name': '___cxa_vec_delete3', 'type': 'I'}
 {'is_defined': True, 'name': '___cxa_vec_dtor', 'type': 'I'}
 {'is_defined': True, 'name': '___cxa_vec_new', 'type': 'I'}
 {'is_defined': True, 'name': '___cxa_vec_new2', 'type': 'I'}
 {'is_defined': True, 'name': '___cxa_vec_new3', 'type': 'I'}
 {'is_defined': True, 'name': '___dynamic_cast', 'type': 'I'}
 {'is_defined': True, 'name': '___gxx_personality_v0', 'type': 'I'}
 No newline at end of file

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

 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE9pbackfailEi', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE9underflowEv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEC1EOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEC2EOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
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 {'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'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}

 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZTv0_n12_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED0Ev', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZTv0_n12_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED1Ev', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_ZdaPv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_ZdaPvSt11align_val_t', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_ZdlPv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_Znam', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_ZnamSt11align_val_t', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_Znwm', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 No newline at end of file

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

 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE9pbackfailEi', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEE9underflowEv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEC1EOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEC2EOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__115basic_stringbufIcNS_11char_traitsIcEENS_9allocatorIcEEEaSEOS5_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'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'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wEXP', 'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'storage_mapping_class': 'DS', 'type': 'FUNC'}

 {'import_export': 'wIMP', 'is_defined': False, 'name': '_ZdaPv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_ZdaPvSt11align_val_t', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_ZdlPv', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_ZdlPvSt11align_val_t', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_Znam', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_ZnamSt11align_val_t', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_Znwm', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 {'import_export': 'wIMP', 'is_defined': False, 'name': '_ZnwmSt11align_val_t', 'storage_mapping_class': 'DS', 'type': 'FUNC'}
 No newline at end of file

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

 {'is_defined': True, 'name': '__ZNSt3__121undeclare_no_pointersEPcm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__123__cxx_atomic_notify_allEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__123__cxx_atomic_notify_allEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__123__cxx_atomic_notify_oneEPVKNS_17__cxx_atomic_implIxNS_22__cxx_atomic_base_implIxEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__123__cxx_atomic_notify_oneEPVKv', 'type': 'FUNC'}
 {'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'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'type': 'FUNC'}

 {'is_defined': True, 'name': '___cxa_vec_delete2', 'type': 'I'}
 {'is_defined': True, 'name': '___cxa_vec_delete3', 'type': 'I'}
 {'is_defined': True, 'name': '___cxa_vec_dtor', 'type': 'I'}
 {'is_defined': True, 'name': '___cxa_vec_new', 'type': 'I'}
 {'is_defined': True, 'name': '___cxa_vec_new2', 'type': 'I'}
 {'is_defined': True, 'name': '___cxa_vec_new3', 'type': 'I'}
 {'is_defined': True, 'name': '___dynamic_cast', 'type': 'I'}
 {'is_defined': True, 'name': '___gxx_personality_v0', 'type': 'I'}
 No newline at end of file

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

 {'is_defined': True, 'name': '_ZNSt3__121undeclare_no_pointersEPcm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__cxx_atomic_notify_allEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__cxx_atomic_notify_allEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__cxx_atomic_notify_oneEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__cxx_atomic_notify_oneEPVKv', 'type': 'FUNC'}
 {'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'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'type': 'FUNC'}

 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIcNS_11char_traitsIcEEED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIcNS_11char_traitsIcEEED1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIwNS_11char_traitsIwEEED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIwNS_11char_traitsIwEEED1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__19strstreamD0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__19strstreamD1Ev', 'type': 'FUNC'}
 No newline at end of file

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

 {'is_defined': True, 'name': '_ZNSt3__121undeclare_no_pointersEPcm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__cxx_atomic_notify_allEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__cxx_atomic_notify_allEPVKv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__cxx_atomic_notify_oneEPVKNS_17__cxx_atomic_implIiNS_22__cxx_atomic_base_implIiEEEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__cxx_atomic_notify_oneEPVKv', 'type': 'FUNC'}
 {'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'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIeeEEPeEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIffEEPfEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIhhEEPhEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIiiEEPiEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIjjEEPjEEbT0_S5_T_', 'type': 'FUNC'}

 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIcNS_11char_traitsIcEEED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIcNS_11char_traitsIcEEED1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIwNS_11char_traitsIwEEED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__113basic_ostreamIwNS_11char_traitsIwEEED1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__114basic_iostreamIcNS_11char_traitsIcEEED1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__19strstreamD0Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZTv0_n24_NSt3__19strstreamD1Ev', 'type': 'FUNC'}
 No newline at end of file

libcxx/src/CMakeLists.txt

 set(LIBCXX_LIB_CMAKEFILES_DIR "${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}"  PARENT_SCOPE)
 
 # Get sources
 set(LIBCXX_SOURCES
   algorithm.cpp
   any.cpp
-  assert.cpp
   atomic.cpp
   barrier.cpp
   bind.cpp
   charconv.cpp
   chrono.cpp
   condition_variable.cpp
   condition_variable_destructor.cpp
   exception.cpp
set(LIBCXX_SOURCES
   support/runtime/stdexcept_vcruntime.ipp
   system_error.cpp
   thread.cpp
   typeinfo.cpp
   utility.cpp
   valarray.cpp
   variant.cpp
   vector.cpp
+  verbose_abort.cpp
   )
 
 if (LIBCXX_ENABLE_DEBUG_MODE OR LIBCXX_ENABLE_BACKWARDS_COMPATIBILITY_DEBUG_MODE_SYMBOLS)
   list(APPEND LIBCXX_SOURCES
     debug.cpp
     legacy_debug_handler.cpp
     )
 endif()

libcxx/src/verbose_abort.cpp

 //===----------------------------------------------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
-#include <__assert>
 #include <__config>
+#include <__verbose_abort>
 #include <cstdarg>
 #include <cstdio>
 #include <cstdlib>
 
 #ifdef __BIONIC__
 #  include <android/api-level.h>
 #  if __ANDROID_API__ >= 21
 #    include <syslog.h>
 extern "C" void android_set_abort_message(const char* msg);
 #  else
 #    include <assert.h>
 #  endif // __ANDROID_API__ >= 21
 #endif   // __BIONIC__
 
 #if defined(__APPLE__) && __has_include(<CrashReporterClient.h>)
 #  include <CrashReporterClient.h>
 #endif
 
 _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.
   {
     va_list list;
     va_start(list, format);
     std::vfprintf(stderr, format, list);
     va_end(list);
   }

libcxx/test/libcxx/assertions/customize_verbose_abort.backdeployment.pass.cpp

 //===----------------------------------------------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
 // Make sure that we can enable assertions when we back-deploy to older platforms
-// if we define _LIBCPP_AVAILABILITY_CUSTOM_ASSERTION_HANDLER_PROVIDED.
+// if we define _LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED.
 //
 // Note that this test isn't really different from customize_handler.pass.cpp when
 // run outside of back-deployment scenarios, but we still run it all the time.
 
-// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1 -D_LIBCPP_AVAILABILITY_CUSTOM_ASSERTION_HANDLER_PROVIDED
+// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1 -D_LIBCPP_AVAILABILITY_CUSTOM_VERBOSE_ABORT_PROVIDED
 
 #include <cassert>
 
 bool handler_called = false;
-void std::__libcpp_assertion_handler(char const*, ...) {
+void std::__libcpp_verbose_abort(char const*, ...) {
   handler_called = true;
 }
 
 int main(int, char**) {
   _LIBCPP_ASSERT(false, "message");
   assert(handler_called);
   return 0;
 }

libcxx/test/libcxx/assertions/customize_verbose_abort.pass.cpp

 //===----------------------------------------------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
-// Test that we can set a custom assertion handler.
+// Test that we can set a custom verbose termination function.
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
-// We flag uses of the assertion handler in older dylibs at compile-time to avoid runtime
+// We flag uses of the verbose termination function in older dylibs at compile-time to avoid runtime
 // failures when back-deploying.
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
 
 #include <cassert>
 
 bool handler_called = false;
-void std::__libcpp_assertion_handler(char const*, ...) {
+void std::__libcpp_verbose_abort(char const*, ...) {
   handler_called = true;
 }
 
 int main(int, char**) {
   _LIBCPP_ASSERT(false, "message");
   assert(handler_called);
   return 0;
 }

libcxx/test/libcxx/assertions/debug_mode_compatibility.pass.cpp

 
 // We flag uses of the assertion handler in older dylibs at compile-time to avoid runtime
 // failures when back-deploying.
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
 
 #include <cassert>
 
 bool handler_called = false;
-void std::__libcpp_assertion_handler(char const*, ...) {
+void std::__libcpp_verbose_abort(char const*, ...) {
   handler_called = true;
 }
 
 int main(int, char**) {
   _LIBCPP_ASSERT(false, "message");
   assert(handler_called);
   return 0;
 }

libcxx/test/libcxx/assertions/default_verbose_abort.availability.verify.cpp

 //===----------------------------------------------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
-// Make sure that we diagnose any usage of the default assertion handler on a platform
-// that doesn't support it at compile-time.
+// Make sure that we diagnose any usage of the default verbose termination function
+// on a platform that doesn't support it at compile-time.
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
 // REQUIRES: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11|12}}
 
 #include <version> // any header would work
 
 void f() {
-  _LIBCPP_ASSERT(true, "message"); // expected-error {{'__libcpp_assertion_handler' is unavailable}}
+  _LIBCPP_ASSERT(true, "message"); // expected-error {{'__libcpp_verbose_abort' is unavailable}}
 }

libcxx/test/libcxx/assertions/default_verbose_abort.pass.cpp

 //===----------------------------------------------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
-// Test that the default assertion handler aborts the program.
+// Test that the default verbose termination function aborts the program.
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
 
-// We flag uses of the assertion handler in older dylibs at compile-time to avoid runtime
+// We flag uses of the verbose termination function in older dylibs at compile-time to avoid runtime
 // failures when back-deploying.
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
 
 #include <csignal>
 #include <cstdlib>
 
 void signal_handler(int signal) {
   if (signal == SIGABRT)

libcxx/test/libcxx/assertions/headers_declare_verbose_abort.sh.cpp

 //===----------------------------------------------------------------------===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
-// Test that all public C++ headers define the assertion handler.
+// Test that all public C++ headers define the verbose termination function.
 
-// We flag uses of the assertion handler in older dylibs at compile-time to avoid runtime
+// We flag uses of the verbose termination function in older dylibs at compile-time to avoid runtime
 // failures when back-deploying.
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
 
 // The system-provided <uchar.h> seems to be broken on AIX, which trips up this test.
 // XFAIL: LIBCXX-AIX-FIXME
 
 /*
 BEGIN-SCRIPT
vars = {
         'restrictions': ' && ' + header_restrictions[header] if header in header_restrictions else '',
         'header': header
     }
 
     print("""\
 // {run}: %{{build}} -DTEST_{i}
 #if defined(TEST_{i}){restrictions}
 #   include <{header}>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 """.format(**vars))
 
 END-SCRIPT
 */
 
 #include <__config>
 
 // Prevent <ext/hash_map> from generating deprecated warnings for this test.
 #if defined(__DEPRECATED)
 #   undef __DEPRECATED
 #endif
 
 int main(int, char**) { return 0; }
 
 // DO NOT MANUALLY EDIT ANYTHING BETWEEN THE MARKERS BELOW
 // GENERATED-MARKER
 // RUN: %{build} -DTEST_0
 #if defined(TEST_0)
 #   include <algorithm>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_1
 #if defined(TEST_1)
 #   include <any>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_2
 #if defined(TEST_2)
 #   include <array>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_3
 #if defined(TEST_3)
 #   include <atomic>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_4
 #if defined(TEST_4) && !defined(_LIBCPP_HAS_NO_THREADS)
 #   include <barrier>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_5
 #if defined(TEST_5)
 #   include <bit>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_6
 #if defined(TEST_6)
 #   include <bitset>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_7
 #if defined(TEST_7)
 #   include <cassert>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_8
 #if defined(TEST_8)
 #   include <ccomplex>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_9
 #if defined(TEST_9)
 #   include <cctype>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_10
 #if defined(TEST_10)
 #   include <cerrno>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_11
 #if defined(TEST_11)
 #   include <cfenv>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_12
 #if defined(TEST_12)
 #   include <cfloat>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_13
 #if defined(TEST_13)
 #   include <charconv>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_14
 #if defined(TEST_14)
 #   include <chrono>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_15
 #if defined(TEST_15)
 #   include <cinttypes>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_16
 #if defined(TEST_16)
 #   include <ciso646>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_17
 #if defined(TEST_17)
 #   include <climits>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_18
 #if defined(TEST_18) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <clocale>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_19
 #if defined(TEST_19)
 #   include <cmath>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_20
 #if defined(TEST_20) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <codecvt>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_21
 #if defined(TEST_21)
 #   include <compare>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_22
 #if defined(TEST_22)
 #   include <complex>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_24
 #if defined(TEST_24)
 #   include <concepts>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_25
 #if defined(TEST_25)
 #   include <condition_variable>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_26
 #if defined(TEST_26)
 #   include <coroutine>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_27
 #if defined(TEST_27)
 #   include <csetjmp>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_28
 #if defined(TEST_28)
 #   include <csignal>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_29
 #if defined(TEST_29)
 #   include <cstdarg>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_30
 #if defined(TEST_30)
 #   include <cstdbool>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_31
 #if defined(TEST_31)
 #   include <cstddef>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_32
 #if defined(TEST_32)
 #   include <cstdint>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_33
 #if defined(TEST_33)
 #   include <cstdio>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_34
 #if defined(TEST_34)
 #   include <cstdlib>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_35
 #if defined(TEST_35)
 #   include <cstring>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_36
 #if defined(TEST_36)
 #   include <ctgmath>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_37
 #if defined(TEST_37)
 #   include <ctime>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_39
 #if defined(TEST_39)
 #   include <cuchar>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_40
 #if defined(TEST_40) && !defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)
 #   include <cwchar>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_41
 #if defined(TEST_41) && !defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)
 #   include <cwctype>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_42
 #if defined(TEST_42)
 #   include <deque>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_44
 #if defined(TEST_44)
 #   include <exception>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_45
 #if defined(TEST_45)
 #   include <execution>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_47
 #if defined(TEST_47) && !defined(_LIBCPP_HAS_NO_FILESYSTEM_LIBRARY)
 #   include <filesystem>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_49
 #if defined(TEST_49)
 #   include <format>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_50
 #if defined(TEST_50)
 #   include <forward_list>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_51
 #if defined(TEST_51) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <fstream>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_52
 #if defined(TEST_52)
 #   include <functional>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_53
 #if defined(TEST_53) && !defined(_LIBCPP_HAS_NO_THREADS)
 #   include <future>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_54
 #if defined(TEST_54)
 #   include <initializer_list>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_56
 #if defined(TEST_56) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <iomanip>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_57
 #if defined(TEST_57) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <ios>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_58
 #if defined(TEST_58)
 #   include <iosfwd>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_59
 #if defined(TEST_59) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <iostream>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_60
 #if defined(TEST_60) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <istream>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_61
 #if defined(TEST_61)
 #   include <iterator>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_62
 #if defined(TEST_62) && !defined(_LIBCPP_HAS_NO_THREADS)
 #   include <latch>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_63
 #if defined(TEST_63)
 #   include <limits>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_65
 #if defined(TEST_65)
 #   include <list>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_66
 #if defined(TEST_66) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <locale>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_68
 #if defined(TEST_68)
 #   include <map>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_70
 #if defined(TEST_70)
 #   include <memory>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_71
 #if defined(TEST_71) && !defined(_LIBCPP_HAS_NO_THREADS)
 #   include <mutex>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_72
 #if defined(TEST_72)
 #   include <new>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_73
 #if defined(TEST_73)
 #   include <numbers>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_74
 #if defined(TEST_74)
 #   include <numeric>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_75
 #if defined(TEST_75)
 #   include <optional>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_76
 #if defined(TEST_76) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <ostream>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_77
 #if defined(TEST_77)
 #   include <queue>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_78
 #if defined(TEST_78)
 #   include <random>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_79
 #if defined(TEST_79)
 #   include <ranges>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_80
 #if defined(TEST_80)
 #   include <ratio>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_81
 #if defined(TEST_81) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <regex>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_82
 #if defined(TEST_82)
 #   include <scoped_allocator>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_83
 #if defined(TEST_83) && !defined(_LIBCPP_HAS_NO_THREADS)
 #   include <semaphore>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_84
 #if defined(TEST_84)
 #   include <set>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_86
 #if defined(TEST_86) && !defined(_LIBCPP_HAS_NO_THREADS)
 #   include <shared_mutex>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_87
 #if defined(TEST_87)
 #   include <span>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_88
 #if defined(TEST_88) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <sstream>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_89
 #if defined(TEST_89)
 #   include <stack>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_93
 #if defined(TEST_93)
 #   include <stdexcept>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_97
 #if defined(TEST_97) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <streambuf>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_98
 #if defined(TEST_98)
 #   include <string>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_100
 #if defined(TEST_100)
 #   include <string_view>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_101
 #if defined(TEST_101) && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
 #   include <strstream>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_102
 #if defined(TEST_102)
 #   include <system_error>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_104
 #if defined(TEST_104) && !defined(_LIBCPP_HAS_NO_THREADS)
 #   include <thread>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_105
 #if defined(TEST_105)
 #   include <tuple>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_106
 #if defined(TEST_106)
 #   include <type_traits>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_107
 #if defined(TEST_107)
 #   include <typeindex>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_108
 #if defined(TEST_108)
 #   include <typeinfo>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_110
 #if defined(TEST_110)
 #   include <unordered_map>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_111
 #if defined(TEST_111)
 #   include <unordered_set>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_112
 #if defined(TEST_112)
 #   include <utility>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_113
 #if defined(TEST_113)
 #   include <valarray>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_114
 #if defined(TEST_114)
 #   include <variant>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_115
 #if defined(TEST_115)
 #   include <vector>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_116
 #if defined(TEST_116)
 #   include <version>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_119
 #if defined(TEST_119) && __cplusplus >= 201103L
 #   include <experimental/algorithm>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_120
 #if defined(TEST_120) && __cplusplus >= 201103L && !defined(_LIBCPP_HAS_NO_EXPERIMENTAL_COROUTINES)
 #   include <experimental/coroutine>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_121
 #if defined(TEST_121) && __cplusplus >= 201103L
 #   include <experimental/deque>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_122
 #if defined(TEST_122) && __cplusplus >= 201103L
 #   include <experimental/forward_list>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_123
 #if defined(TEST_123) && __cplusplus >= 201103L
 #   include <experimental/functional>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_124
 #if defined(TEST_124) && __cplusplus >= 201103L
 #   include <experimental/iterator>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_125
 #if defined(TEST_125) && __cplusplus >= 201103L
 #   include <experimental/list>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_126
 #if defined(TEST_126) && __cplusplus >= 201103L
 #   include <experimental/map>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_127
 #if defined(TEST_127) && __cplusplus >= 201103L
 #   include <experimental/memory_resource>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_128
 #if defined(TEST_128) && __cplusplus >= 201103L
 #   include <experimental/propagate_const>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_129
 #if defined(TEST_129) && !defined(_LIBCPP_HAS_NO_LOCALIZATION) && __cplusplus >= 201103L
 #   include <experimental/regex>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_130
 #if defined(TEST_130) && __cplusplus >= 201103L
 #   include <experimental/set>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_131
 #if defined(TEST_131) && __cplusplus >= 201103L
 #   include <experimental/simd>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_132
 #if defined(TEST_132) && __cplusplus >= 201103L
 #   include <experimental/string>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_133
 #if defined(TEST_133) && __cplusplus >= 201103L
 #   include <experimental/type_traits>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_134
 #if defined(TEST_134) && __cplusplus >= 201103L
 #   include <experimental/unordered_map>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_135
 #if defined(TEST_135) && __cplusplus >= 201103L
 #   include <experimental/unordered_set>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_136
 #if defined(TEST_136) && __cplusplus >= 201103L
 #   include <experimental/utility>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_137
 #if defined(TEST_137) && __cplusplus >= 201103L
 #   include <experimental/vector>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_138
 #if defined(TEST_138)
 #   include <ext/hash_map>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // RUN: %{build} -DTEST_139
 #if defined(TEST_139)
 #   include <ext/hash_set>
-    using HandlerType = decltype(std::__libcpp_assertion_handler);
+    using HandlerType = decltype(std::__libcpp_verbose_abort);
 #endif
 
 // GENERATED-MARKER

libcxx/test/support/check_assertion.h

private:
   pid_t child_pid_ = -1;
   int exit_code_ = -1;
   int stdout_pipe_fd_[2];
   int stderr_pipe_fd_[2];
   std::string stdout_from_child_;
   std::string stderr_from_child_;
 };
 
-void std::__libcpp_assertion_handler(char const* format, ...) {
+void std::__libcpp_verbose_abort(char const* format, ...) {
   assert(!GlobalMatcher().empty());
 
   // Extract information from the error message. This has to stay synchronized with
   // how we format assertions in the library.
   va_list list;
   va_start(list, format);
   char const* file = va_arg(list, char const*);
   int line = va_arg(list, int);

libcxx/utils/generate_header_tests.py

header_restrictions = {
     "experimental/unordered_set": "__cplusplus >= 201103L",
     "experimental/utility": "__cplusplus >= 201103L",
     "experimental/vector": "__cplusplus >= 201103L",
 }
 
 private_headers_still_public_in_modules = [
     '__assert', '__bsd_locale_defaults.h', '__bsd_locale_fallbacks.h', '__config',
     '__config_site.in', '__debug', '__hash_table',
-    '__threading_support', '__tree', '__undef_macros'
+    '__threading_support', '__tree', '__undef_macros', '__verbose_abort'
 ]
 
 def find_script(file):
     """Finds the script used to generate a file inside the file itself. The script is delimited by
        BEGIN-SCRIPT and END-SCRIPT markers.
     """
     with open(file, 'r') as f:
         content = f.read()
variables = {
         'experimental_headers': experimental_headers,
         'extended_headers': extended_headers,
         'public_headers': public_headers,
         'private_headers': private_headers,
         'header_restrictions': header_restrictions,
         'private_headers_still_public_in_modules': private_headers_still_public_in_modules
     }
 
-    produce(test.joinpath('libcxx/assertions/headers_declare_assertion_handler.sh.cpp'), variables)
+    produce(test.joinpath('libcxx/assertions/headers_declare_verbose_abort.sh.cpp'), variables)
     produce(test.joinpath('libcxx/clang_tidy.sh.cpp'), variables)
     produce(test.joinpath('libcxx/double_include.sh.cpp'), variables)
     produce(test.joinpath('libcxx/min_max_macros.compile.pass.cpp'), variables)
     produce(test.joinpath('libcxx/modules_include.sh.cpp'), variables)
     produce(test.joinpath('libcxx/nasty_macros.compile.pass.cpp'), variables)
     produce(test.joinpath('libcxx/no_assert_include.compile.pass.cpp'), variables)
     produce(test.joinpath('libcxx/private_headers.verify.cpp'), variables)
     produce(test.joinpath('libcxx/transitive_includes.sh.cpp'), variables)
 
 
 if __name__ == '__main__':
     main()