Remove exception throwing debug mode handler support.

[EricWF]

Summary

The reason libc++ implemented a throwing debug mode handler was for ease of testing. Specifically,
I thought that if a debug violation aborted, we could only test one violation per file. This made
it impossible to test debug mode. Which throwing behavior we could test more!

However, the throwing approach didn't work either, since there are debug violations underneath noexcept
functions. This lead to the introduction of _NOEXCEPT_DEBUG, which was only noexcept when debug
mode was off.

Having thought more and having grown wiser, _NOEXCEPT_DEBUG was a horrible decision. It was
viral, it didn't cover all the cases it needed to, and it was observable to the user -- at worst
changing the behavior of their program.

This patch removes the throwing debug handler, and rewrites the debug tests using 'fork-ing' style
death tests.

[ldionne]

I really like that. I wasn't aware of the exception business in the debug mode, but I agree that the new approach makes more sense.

test/support/debug_mode_helper.h

30

So these tests are not going to work on Windows -- correct?

50

So, if file is "f" and got.__file_ is "foo", this is going to consider it a match. Is that intended?

110

assert(child_pid != -1 && "failed to fork a process to perform a death test")

124

So, when you fork, the child gets its own copy of the parent's file descriptors. Here I understand you're closing the _read_ end of the pipe because you won't need it, but this does not affect the read end of the pipe for the parent process. Is my understanding correct?

Also, please add // don't need to read from the pipe in the child.

125

What about stderr? Also, I would suggest doing something like this instead:

int dup_result = dup2(pipe_fd[1], STDOUT_FILENO);
assert(dup_result != -1 && "Something went wrong while redirecting stdout to the pipe");

Otherwise, with the while, you should probably also handle errno == EMFILE. And if errno == EBADF, we'll continue executing the death test and we'll notice that there's no match, when the problem really is that the redirection of stdout failed. This could be tricky to debug. I think it's better to fail early and loud here, even though we _might_ sometimes (but rarely) error out when we could have instead tried again and succeeded. WDYT?

133

// no need to write from the parent process

150

Why don't you pass &status_ directly?

151

You mean result != -1, right?

Also, assert(result != -1 && "there is no child process to wait for").

170

Instead, I might have int read_fd_, write_fd_, and set them up in the constructor or in Run:

int pipe_fd[2];
int pipe_res = pipe(pipe_fd);
assert(pipe_res != -1);
read_fd_ = pipe_fd[0];
write_fd_ = pipe_fd[1];

This would allow you to use read_fd_ and write_fd_ everywhere else in the class, which is more readable IMO.

204

I notice you're taking precautions to make the rest of this file C++03 compliant (e.g. no enum class, etc..), however you require a lambda here. I'd be fine if the debug tests were only enabled with C++11 and above.

[ldionne]

lib/abi/x86_64-apple-darwin.v1.abilist

264

Also, this "ABI break" is fine as far as Apple is concerned because we don't ship the debug mode in our dylib. So this is not an ABI break for us.

[mclow.lists]

I have marked test/libcxx/debug/containers/db_sequence_container_iterators.pass.cpp and libcxx/containers/sequences/array/array.zero/db_indexing.pass.cpp because I marked operator[] and front and back as noexcept.

These tests need to be un-XFAIL-ed when they are rewritten.

[EricWF]

lib/abi/x86_64-apple-darwin.v1.abilist

264

Cool. Maybe we should omit __libcpp_debug symbols from the ABI list all together. I'll confirm with FreeBSD that they're not concerned about ABI stability here either.

test/support/debug_mode_helper.h

30

Not right away. But I'll work on it once we get Windows CI up and running.

50

That's not intentional. Good catch.

I changed it so the match has to go until the end and the match must start at the beginning or immediately after a directory separator.

124

I believe your understanding is correct.

I've tested that this all works when a EXPECT_DEATH assertion fails.

125

I've added logic to capture both stderr and stdout.

I agree it's better to fail loud and early.
Instead of handling EMFILE and EBADF, I've changed the test runner to exit with a specific value when the setup code fails, so that the parent will know what happened.

150

I'm going to remove status_ entirely. So that will clean this up.

170

I hid most of this behind named methods now. I think that addresses your concerns.

204

I'm not really taking precautions to make this C++03 compliant. For example, I don't want or need an enum class for ResultKind.

But I'll add an explicit dialect check at the top of the file requiring C++11.

[EricWF]

Address review comments. I think this is good to go.

[ldionne]

LGTM with inline nit.

test/support/debug_mode_helper.h

203

Trailing underscore for member variables?

[EricWF]

Address final inline comments.

include/__config

 #ifndef _LIBCPP_HAS_NO_NOEXCEPT
 #  define _NOEXCEPT noexcept
 #  define _NOEXCEPT_(x) noexcept(x)
 #else
 #  define _NOEXCEPT throw()
 #  define _NOEXCEPT_(x)
 #endif
 
-#if defined(_LIBCPP_DEBUG_USE_EXCEPTIONS)
-#  if !defined(_LIBCPP_DEBUG)
-#    error cannot use _LIBCPP_DEBUG_USE_EXCEPTIONS unless _LIBCPP_DEBUG is defined
-#  endif
-#  ifdef _LIBCPP_HAS_NO_NOEXCEPT
-#    define _NOEXCEPT_DEBUG
-#    define _NOEXCEPT_DEBUG_(x)
-#  else
-#    define _NOEXCEPT_DEBUG noexcept(false)
-#    define _NOEXCEPT_DEBUG_(x) noexcept(false)
-#  endif
-#else
-#  define _NOEXCEPT_DEBUG _NOEXCEPT
-#  define _NOEXCEPT_DEBUG_(x) _NOEXCEPT_(x)
-#endif
-
 #ifdef _LIBCPP_HAS_NO_UNICODE_CHARS
 typedef unsigned short char16_t;
 typedef unsigned int   char32_t;
 #endif  // _LIBCPP_HAS_NO_UNICODE_CHARS
 
 #ifndef __SIZEOF_INT128__
 #define _LIBCPP_HAS_NO_INT128
 #endif

include/__debug

 // -*- C++ -*-
 //===--------------------------- __debug ----------------------------------===//
 //
 // 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_DEBUG_H
 #define _LIBCPP_DEBUG_H
 
 #include <__config>
+#include <iosfwd>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
 
 #if defined(_LIBCPP_HAS_NO_NULLPTR)
 # include <cstddef>
 #endif
 
 #if _LIBCPP_DEBUG_LEVEL >= 1 || defined(_LIBCPP_BUILDING_LIBRARY)
 #   include <cstdlib>
 #   include <cstdio>
 #   include <cstddef>
-#   include <exception>
 #endif
 
 #if _LIBCPP_DEBUG_LEVEL >= 1 && !defined(_LIBCPP_ASSERT)
 # define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : \
   _VSTD::__libcpp_debug_function(_VSTD::__libcpp_debug_info(__FILE__, __LINE__, #x, m)))
 #endif
 
 #if _LIBCPP_DEBUG_LEVEL >= 2
 #ifndef _LIBCPP_DEBUG_ASSERT
 #define _LIBCPP_DEBUG_ASSERT(x, m) _LIBCPP_ASSERT(x, m)
 #endif
 #define _LIBCPP_DEBUG_MODE(...) __VA_ARGS__
 #endif
 
 #ifndef _LIBCPP_ASSERT
 #   define _LIBCPP_ASSERT(x, m) ((void)0)
 #endif
 #ifndef _LIBCPP_DEBUG_ASSERT
 #   define _LIBCPP_DEBUG_ASSERT(x, m) ((void)0)
 #endif
 #ifndef _LIBCPP_DEBUG_MODE
 #define _LIBCPP_DEBUG_MODE(...) ((void)0)
 #endif
 
-#if _LIBCPP_DEBUG_LEVEL < 1
-class _LIBCPP_EXCEPTION_ABI __libcpp_debug_exception;
-#endif
-
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 struct _LIBCPP_TEMPLATE_VIS __libcpp_debug_info {
   _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
   __libcpp_debug_info()
       : __file_(nullptr), __line_(-1), __pred_(nullptr), __msg_(nullptr) {}
   _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
   __libcpp_debug_info(const char* __f, int __l, const char* __p, const char* __m)
     : __file_(__f), __line_(__l), __pred_(__p), __msg_(__m) {}
+
+  _LIBCPP_FUNC_VIS std::string what() const;
+
   const char* __file_;
   int __line_;
   const char* __pred_;
   const char* __msg_;
 };
 
 /// __libcpp_debug_function_type - The type of the assertion failure handler.
 typedef void(*__libcpp_debug_function_type)(__libcpp_debug_info const&);
 
 /// __libcpp_debug_function - The handler function called when a _LIBCPP_ASSERT
 ///    fails.
 extern _LIBCPP_EXPORTED_FROM_ABI __libcpp_debug_function_type __libcpp_debug_function;
 
 /// __libcpp_abort_debug_function - A debug handler that aborts when called.
 _LIBCPP_NORETURN _LIBCPP_FUNC_VIS
 void __libcpp_abort_debug_function(__libcpp_debug_info const&);
 
-/// __libcpp_throw_debug_function - A debug handler that throws
-///   an instance of __libcpp_debug_exception when called.
- _LIBCPP_NORETURN _LIBCPP_FUNC_VIS
-void __libcpp_throw_debug_function(__libcpp_debug_info const&);
-
 /// __libcpp_set_debug_function - Set the debug handler to the specified
 ///    function.
 _LIBCPP_FUNC_VIS
 bool __libcpp_set_debug_function(__libcpp_debug_function_type __func);
 
-// Setup the throwing debug handler during dynamic initialization.
-#if _LIBCPP_DEBUG_LEVEL >= 1 && defined(_LIBCPP_DEBUG_USE_EXCEPTIONS)
-# if defined(_LIBCPP_NO_EXCEPTIONS)
-#   error _LIBCPP_DEBUG_USE_EXCEPTIONS cannot be used when exceptions are disabled.
-# endif
-static bool __init_dummy = __libcpp_set_debug_function(__libcpp_throw_debug_function);
-#endif
-
-#if _LIBCPP_DEBUG_LEVEL >= 1 || defined(_LIBCPP_BUILDING_LIBRARY)
-class _LIBCPP_EXCEPTION_ABI __libcpp_debug_exception : public exception {
-public:
-  __libcpp_debug_exception() _NOEXCEPT;
-  explicit __libcpp_debug_exception(__libcpp_debug_info const& __i);
-  __libcpp_debug_exception(__libcpp_debug_exception const&);
-  ~__libcpp_debug_exception() _NOEXCEPT;
-  const char* what() const _NOEXCEPT;
-private:
-  struct __libcpp_debug_exception_imp;
-  __libcpp_debug_exception_imp *__imp_;
-};
-#endif
-
 #if _LIBCPP_DEBUG_LEVEL >= 2 || defined(_LIBCPP_BUILDING_LIBRARY)
 
 struct _LIBCPP_TYPE_VIS __c_node;
 
 struct _LIBCPP_TYPE_VIS __i_node
 {
     void* __i_;
     __i_node* __next_;

include/__hash_table

         pair<iterator, iterator>
         __equal_range_multi(const _Key& __k);
     template <class _Key>
         pair<const_iterator, const_iterator>
         __equal_range_multi(const _Key& __k) const;
 
     void swap(__hash_table& __u)
 #if _LIBCPP_STD_VER <= 11
-        _NOEXCEPT_DEBUG_(
+        _NOEXCEPT_(
             __is_nothrow_swappable<hasher>::value && __is_nothrow_swappable<key_equal>::value
             && (!allocator_traits<__pointer_allocator>::propagate_on_container_swap::value
                   || __is_nothrow_swappable<__pointer_allocator>::value)
             && (!__node_traits::propagate_on_container_swap::value
                   || __is_nothrow_swappable<__node_allocator>::value)
             );
 #else
-     _NOEXCEPT_DEBUG_(__is_nothrow_swappable<hasher>::value && __is_nothrow_swappable<key_equal>::value);
+     _NOEXCEPT_(__is_nothrow_swappable<hasher>::value && __is_nothrow_swappable<key_equal>::value);
 #endif
 
     _LIBCPP_INLINE_VISIBILITY
     size_type max_bucket_count() const _NOEXCEPT
         {return max_size(); }
     size_type bucket_size(size_type __n) const;
     _LIBCPP_INLINE_VISIBILITY float load_factor() const _NOEXCEPT
     {

     }
     return pair<const_iterator, const_iterator>(__i, __j);
 }
 
 template <class _Tp, class _Hash, class _Equal, class _Alloc>
 void
 __hash_table<_Tp, _Hash, _Equal, _Alloc>::swap(__hash_table& __u)
 #if _LIBCPP_STD_VER <= 11
-    _NOEXCEPT_DEBUG_(
+    _NOEXCEPT_(
         __is_nothrow_swappable<hasher>::value && __is_nothrow_swappable<key_equal>::value
         && (!allocator_traits<__pointer_allocator>::propagate_on_container_swap::value
               || __is_nothrow_swappable<__pointer_allocator>::value)
         && (!__node_traits::propagate_on_container_swap::value
               || __is_nothrow_swappable<__node_allocator>::value)
             )
 #else
-  _NOEXCEPT_DEBUG_(__is_nothrow_swappable<hasher>::value && __is_nothrow_swappable<key_equal>::value)
+  _NOEXCEPT_(__is_nothrow_swappable<hasher>::value && __is_nothrow_swappable<key_equal>::value)
 #endif
 {
     _LIBCPP_ASSERT(__node_traits::propagate_on_container_swap::value ||
                    this->__node_alloc() == __u.__node_alloc(),
                    "list::swap: Either propagate_on_container_swap must be true"
                    " or the allocators must compare equal");
     {
     __node_pointer_pointer __npp = __bucket_list_.release();

include/iterator

 
 // __wrap_iter
 
 template <class _Iter> class __wrap_iter;
 
 template <class _Iter1, class _Iter2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
 template <class _Iter1, class _Iter2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
 template <class _Iter1, class _Iter2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
 template <class _Iter1, class _Iter2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
 template <class _Iter1, class _Iter2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
 template <class _Iter1, class _Iter2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
 #ifndef _LIBCPP_CXX03_LANG
 template <class _Iter1, class _Iter2>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 auto
-operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT_DEBUG
+operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 -> decltype(__x.base() - __y.base());
 #else
 template <class _Iter1, class _Iter2>
 _LIBCPP_INLINE_VISIBILITY
 typename __wrap_iter<_Iter1>::difference_type
-operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 #endif
 
 template <class _Iter>
 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 __wrap_iter<_Iter>
-operator+(typename __wrap_iter<_Iter>::difference_type, __wrap_iter<_Iter>) _NOEXCEPT_DEBUG;
+operator+(typename __wrap_iter<_Iter>::difference_type, __wrap_iter<_Iter>) _NOEXCEPT;
 
 template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY copy(_Ip, _Ip, _Op);
 template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY copy_backward(_B1, _B1, _B2);
 template <class _Ip, class _Op> _Op _LIBCPP_INLINE_VISIBILITY move(_Ip, _Ip, _Op);
 template <class _B1, class _B2> _B2 _LIBCPP_INLINE_VISIBILITY move_backward(_B1, _B1, _B2);
 
 #if _LIBCPP_DEBUG_LEVEL < 2
 

     typedef typename iterator_traits<iterator_type>::iterator_category iterator_category;
     typedef typename iterator_traits<iterator_type>::value_type        value_type;
     typedef typename iterator_traits<iterator_type>::difference_type   difference_type;
     typedef typename iterator_traits<iterator_type>::pointer           pointer;
     typedef typename iterator_traits<iterator_type>::reference         reference;
 private:
     iterator_type __i;
 public:
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter() _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter() _NOEXCEPT
 #if _LIBCPP_STD_VER > 11
                 : __i{}
 #endif
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         __get_db()->__insert_i(this);
 #endif
     }
     template <class _Up> _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
         __wrap_iter(const __wrap_iter<_Up>& __u,
-            typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = 0) _NOEXCEPT_DEBUG
+            typename enable_if<is_convertible<_Up, iterator_type>::value>::type* = 0) _NOEXCEPT
             : __i(__u.base())
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         __get_db()->__iterator_copy(this, &__u);
 #endif
     }
 #if _LIBCPP_DEBUG_LEVEL >= 2
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG

         return *this;
     }
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
     ~__wrap_iter()
     {
         __get_db()->__erase_i(this);
     }
 #endif
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator*() const _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference operator*() const _NOEXCEPT
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
                        "Attempted to dereference a non-dereferenceable iterator");
 #endif
         return *__i;
     }
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG pointer  operator->() const _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG pointer  operator->() const _NOEXCEPT
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
                        "Attempted to dereference a non-dereferenceable iterator");
 #endif
         return (pointer)_VSTD::addressof(*__i);
     }
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator++() _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator++() _NOEXCEPT
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         _LIBCPP_ASSERT(__get_const_db()->__dereferenceable(this),
                        "Attempted to increment non-incrementable iterator");
 #endif
         ++__i;
         return *this;
     }
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter  operator++(int) _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter  operator++(int) _NOEXCEPT
         {__wrap_iter __tmp(*this); ++(*this); return __tmp;}
 
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator--() _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator--() _NOEXCEPT
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         _LIBCPP_ASSERT(__get_const_db()->__decrementable(this),
                        "Attempted to decrement non-decrementable iterator");
 #endif
         --__i;
         return *this;
     }
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter  operator--(int) _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter  operator--(int) _NOEXCEPT
         {__wrap_iter __tmp(*this); --(*this); return __tmp;}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter  operator+ (difference_type __n) const _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter  operator+ (difference_type __n) const _NOEXCEPT
         {__wrap_iter __w(*this); __w += __n; return __w;}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator+=(difference_type __n) _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator+=(difference_type __n) _NOEXCEPT
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         _LIBCPP_ASSERT(__get_const_db()->__addable(this, __n),
                    "Attempted to add/subtract iterator outside of valid range");
 #endif
         __i += __n;
         return *this;
     }
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter  operator- (difference_type __n) const _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter  operator- (difference_type __n) const _NOEXCEPT
         {return *this + (-__n);}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator-=(difference_type __n) _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter& operator-=(difference_type __n) _NOEXCEPT
         {*this += -__n; return *this;}
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference    operator[](difference_type __n) const _NOEXCEPT_DEBUG
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG reference    operator[](difference_type __n) const _NOEXCEPT
     {
 #if _LIBCPP_DEBUG_LEVEL >= 2
         _LIBCPP_ASSERT(__get_const_db()->__subscriptable(this, __n),
                    "Attempted to subscript iterator outside of valid range");
 #endif
         return __i[__n];
     }
 
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG iterator_type base() const _NOEXCEPT_DEBUG {return __i;}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG iterator_type base() const _NOEXCEPT {return __i;}
 
 private:
 #if _LIBCPP_DEBUG_LEVEL >= 2
     _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(const void* __p, iterator_type __x) : __i(__x)
     {
         __get_db()->__insert_ic(this, __p);
     }
 #else
-    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(iterator_type __x) _NOEXCEPT_DEBUG : __i(__x) {}
+    _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG __wrap_iter(iterator_type __x) _NOEXCEPT : __i(__x) {}
 #endif
 
     template <class _Up> friend class __wrap_iter;
     template <class _CharT, class _Traits, class _Alloc> friend class basic_string;
     template <class _Tp, class _Alloc> friend class _LIBCPP_TEMPLATE_VIS vector;
     template <class _Tp, size_t> friend class _LIBCPP_TEMPLATE_VIS span;
 
     template <class _Iter1, class _Iter2>
     _LIBCPP_CONSTEXPR_IF_NODEBUG friend
     bool
-    operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+    operator==(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
     template <class _Iter1, class _Iter2>
     _LIBCPP_CONSTEXPR_IF_NODEBUG friend
     bool
-    operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+    operator<(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
     template <class _Iter1, class _Iter2>
     _LIBCPP_CONSTEXPR_IF_NODEBUG friend
     bool
-    operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+    operator!=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
     template <class _Iter1, class _Iter2>
     _LIBCPP_CONSTEXPR_IF_NODEBUG friend
     bool
-    operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+    operator>(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
     template <class _Iter1, class _Iter2>
     _LIBCPP_CONSTEXPR_IF_NODEBUG friend
     bool
-    operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+    operator>=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
     template <class _Iter1, class _Iter2>
     _LIBCPP_CONSTEXPR_IF_NODEBUG friend
     bool
-    operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+    operator<=(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 
 #ifndef _LIBCPP_CXX03_LANG
     template <class _Iter1, class _Iter2>
     _LIBCPP_CONSTEXPR_IF_NODEBUG friend
     auto
-    operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT_DEBUG
+    operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
     -> decltype(__x.base() - __y.base());
 #else
     template <class _Iter1, class _Iter2>
     _LIBCPP_CONSTEXPR_IF_NODEBUG friend
     typename __wrap_iter<_Iter1>::difference_type
-    operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT_DEBUG;
+    operator-(const __wrap_iter<_Iter1>&, const __wrap_iter<_Iter2>&) _NOEXCEPT;
 #endif
 
     template <class _Iter1>
     _LIBCPP_CONSTEXPR_IF_NODEBUG friend
     __wrap_iter<_Iter1>
-    operator+(typename __wrap_iter<_Iter1>::difference_type, __wrap_iter<_Iter1>) _NOEXCEPT_DEBUG;
+    operator+(typename __wrap_iter<_Iter1>::difference_type, __wrap_iter<_Iter1>) _NOEXCEPT;
 
     template <class _Ip, class _Op> friend _Op copy(_Ip, _Ip, _Op);
     template <class _B1, class _B2> friend _B2 copy_backward(_B1, _B1, _B2);
     template <class _Ip, class _Op> friend _Op move(_Ip, _Ip, _Op);
     template <class _B1, class _B2> friend _B2 move_backward(_B1, _B1, _B2);
 
 #if _LIBCPP_DEBUG_LEVEL < 2
     template <class _Tp>

   >::type
   __unwrap_iter(__wrap_iter<_Tp*> __i);
 #endif
 };
 
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT_DEBUG
+operator==(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 {
     return __x.base() == __y.base();
 }
 
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT_DEBUG
+operator<(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
     _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
                    "Attempted to compare incomparable iterators");
 #endif
     return __x.base() < __y.base();
 }
 
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT_DEBUG
+operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 {
     return !(__x == __y);
 }
 
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT_DEBUG
+operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 {
     return __y < __x;
 }
 
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT_DEBUG
+operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 {
     return !(__x < __y);
 }
 
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT_DEBUG
+operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 {
     return !(__y < __x);
 }
 
 template <class _Iter1>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT_DEBUG
+operator!=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
 {
     return !(__x == __y);
 }
 
 template <class _Iter1>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT_DEBUG
+operator>(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
 {
     return __y < __x;
 }
 
 template <class _Iter1>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT_DEBUG
+operator>=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
 {
     return !(__x < __y);
 }
 
 template <class _Iter1>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 bool
-operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT_DEBUG
+operator<=(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter1>& __y) _NOEXCEPT
 {
     return !(__y < __x);
 }
 
 #ifndef _LIBCPP_CXX03_LANG
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 auto
-operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT_DEBUG
+operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 -> decltype(__x.base() - __y.base())
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
     _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
                    "Attempted to subtract incompatible iterators");
 #endif
     return __x.base() - __y.base();
 }
 #else
 template <class _Iter1, class _Iter2>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 typename __wrap_iter<_Iter1>::difference_type
-operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT_DEBUG
+operator-(const __wrap_iter<_Iter1>& __x, const __wrap_iter<_Iter2>& __y) _NOEXCEPT
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
     _LIBCPP_ASSERT(__get_const_db()->__less_than_comparable(&__x, &__y),
                    "Attempted to subtract incompatible iterators");
 #endif
     return __x.base() - __y.base();
 }
 #endif
 
 template <class _Iter>
 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_IF_NODEBUG
 __wrap_iter<_Iter>
 operator+(typename __wrap_iter<_Iter>::difference_type __n,
-          __wrap_iter<_Iter> __x) _NOEXCEPT_DEBUG
+          __wrap_iter<_Iter> __x) _NOEXCEPT
 {
     __x += __n;
     return __x;
 }
 
 template <class _Iter>
 struct __libcpp_is_trivial_iterator
     : public _LIBCPP_BOOL_CONSTANT(is_pointer<_Iter>::value) {};

include/list

#if _LIBCPP_DEBUG_LEVEL >= 2
         return const_iterator(__end_as_link(), this);
 #else
         return const_iterator(__end_as_link());
 #endif
     }
 
     void swap(__list_imp& __c)
 #if _LIBCPP_STD_VER >= 14
-        _NOEXCEPT_DEBUG;
+        _NOEXCEPT;
 #else
-        _NOEXCEPT_DEBUG_(!__alloc_traits::propagate_on_container_swap::value ||
+        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                     __is_nothrow_swappable<allocator_type>::value);
 #endif
 
     _LIBCPP_INLINE_VISIBILITY
     void __copy_assign_alloc(const __list_imp& __c)
         {__copy_assign_alloc(__c, integral_constant<bool,
                       __node_alloc_traits::propagate_on_container_copy_assignment::value>());}
 
if (!empty())
         __invalidate_all_iterators();
     }
 }
 
 template <class _Tp, class _Alloc>
 void
 __list_imp<_Tp, _Alloc>::swap(__list_imp& __c)
 #if _LIBCPP_STD_VER >= 14
-        _NOEXCEPT_DEBUG
+        _NOEXCEPT
 #else
-        _NOEXCEPT_DEBUG_(!__alloc_traits::propagate_on_container_swap::value ||
+        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                     __is_nothrow_swappable<allocator_type>::value)
 #endif
 {
     _LIBCPP_ASSERT(__alloc_traits::propagate_on_container_swap::value ||
                    this->__node_alloc() == __c.__node_alloc(),
                    "list::swap: Either propagate_on_container_swap must be true"
                    " or the allocators must compare equal");
     using _VSTD::swap;
#endif
     iterator insert(const_iterator __p, size_type __n, const value_type& __x);
     template <class _InpIter>
         iterator insert(const_iterator __p, _InpIter __f, _InpIter __l,
              typename enable_if<__is_input_iterator<_InpIter>::value>::type* = 0);
 
     _LIBCPP_INLINE_VISIBILITY
     void swap(list& __c)
 #if _LIBCPP_STD_VER >= 14
-        _NOEXCEPT_DEBUG
+        _NOEXCEPT
 #else
-        _NOEXCEPT_DEBUG_(!__node_alloc_traits::propagate_on_container_swap::value ||
+        _NOEXCEPT_(!__node_alloc_traits::propagate_on_container_swap::value ||
                    __is_nothrow_swappable<__node_allocator>::value)
 #endif
         {base::swap(__c);}
     _LIBCPP_INLINE_VISIBILITY
     void clear() _NOEXCEPT {base::clear();}
 
     void pop_front();
     void pop_back();

include/string

 
     size_type copy(value_type* __s, size_type __n, size_type __pos = 0) const;
     _LIBCPP_INLINE_VISIBILITY
     basic_string substr(size_type __pos = 0, size_type __n = npos) const;
 
     _LIBCPP_INLINE_VISIBILITY
     void swap(basic_string& __str)
 #if _LIBCPP_STD_VER >= 14
-        _NOEXCEPT_DEBUG;
+        _NOEXCEPT;
 #else
-        _NOEXCEPT_DEBUG_(!__alloc_traits::propagate_on_container_swap::value ||
+        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                     __is_nothrow_swappable<allocator_type>::value);
 #endif
 
     _LIBCPP_INLINE_VISIBILITY
     const value_type* c_str() const _NOEXCEPT {return data();}
     _LIBCPP_INLINE_VISIBILITY
     const value_type* data() const _NOEXCEPT  {return _VSTD::__to_raw_pointer(__get_pointer());}
 #if _LIBCPP_STD_VER > 14 || defined(_LIBCPP_BUILDING_LIBRARY)

     return basic_string(*this, __pos, __n, __alloc());
 }
 
 template <class _CharT, class _Traits, class _Allocator>
 inline
 void
 basic_string<_CharT, _Traits, _Allocator>::swap(basic_string& __str)
 #if _LIBCPP_STD_VER >= 14
-        _NOEXCEPT_DEBUG
+        _NOEXCEPT
 #else
-        _NOEXCEPT_DEBUG_(!__alloc_traits::propagate_on_container_swap::value ||
+        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                     __is_nothrow_swappable<allocator_type>::value)
 #endif
 {
 #if _LIBCPP_DEBUG_LEVEL >= 2
     if (!__is_long())
         __get_db()->__invalidate_all(this);
     if (!__str.__is_long())
         __get_db()->__invalidate_all(&__str);

include/vector

void clear() _NOEXCEPT
         __invalidate_all_iterators();
     }
 
     void resize(size_type __sz);
     void resize(size_type __sz, const_reference __x);
 
     void swap(vector&)
 #if _LIBCPP_STD_VER >= 14
-        _NOEXCEPT_DEBUG;
+        _NOEXCEPT;
 #else
-        _NOEXCEPT_DEBUG_(!__alloc_traits::propagate_on_container_swap::value ||
+        _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                     __is_nothrow_swappable<allocator_type>::value);
 #endif
 
     bool __invariants() const;
 
 #if _LIBCPP_DEBUG_LEVEL >= 2
 
     bool __dereferenceable(const const_iterator* __i) const;
vector<_Tp, _Allocator>::resize(size_type __sz, const_reference __x)
     else if (__cs > __sz)
         this->__destruct_at_end(this->__begin_ + __sz);
 }
 
 template <class _Tp, class _Allocator>
 void
 vector<_Tp, _Allocator>::swap(vector& __x)
 #if _LIBCPP_STD_VER >= 14
-    _NOEXCEPT_DEBUG
+    _NOEXCEPT
 #else
-    _NOEXCEPT_DEBUG_(!__alloc_traits::propagate_on_container_swap::value ||
+    _NOEXCEPT_(!__alloc_traits::propagate_on_container_swap::value ||
                 __is_nothrow_swappable<allocator_type>::value)
 #endif
 {
     _LIBCPP_ASSERT(__alloc_traits::propagate_on_container_swap::value ||
                    this->__alloc() == __x.__alloc(),
                    "vector::swap: Either propagate_on_container_swap must be true"
                    " or the allocators must compare equal");
     _VSTD::swap(this->__begin_, __x.__begin_);

lib/abi/CHANGELOG.TXT

 Afterwards the ABI list should be updated to include the new changes.
 
 New entries should be added directly below the "Version" header.
 
 -----------
 Version 9.0
 -----------
 
+* rTBD - Remove exception throwing debug mode handler support.
+
+  The reason libc++ implemented a throwing debug mode handler was for ease of testing. Specifically,
+  I thought that if a debug violation aborted, we could only test one violation per file. This made
+  it impossible to test debug mode. Which throwing behavior we could test more!
+
+  However, the throwing approach didn't work either, since there are debug violations underneath noexcept
+  functions. This lead to the introduction of `_NOEXCEPT_DEBUG`, which was only noexcept when debug
+  mode was off.
+
+  Having thought more and having grown wiser, `_NOEXCEPT_DEBUG` was a horrible decision. It was
+  viral, it didn't cover all the cases it needed to, and it was observable to the user -- at worst
+  changing the behavior of their program.
+
+  This patch removes the throwing debug handler, and rewrites the debug tests using 'fork-ing' style
+  death tests.
+
+  All Platforms (ignoring versioning namespaces)
+  ----------------------------------------------
+  Symbol added: _ZNKSt3__119__libcpp_debug_info4whatEv
+  Symbol removed: _ZNKSt3__124__libcpp_debug_exception4whatEv
+  Symbol removed: _ZNSt3__124__libcpp_debug_exceptionC1ERKNS_19__libcpp_debug_infoE
+  Symbol removed: _ZNSt3__124__libcpp_debug_exceptionC1ERKS0_
+  Symbol removed: _ZNSt3__124__libcpp_debug_exceptionC1Ev
+  Symbol removed: _ZNSt3__124__libcpp_debug_exceptionC2ERKNS_19__libcpp_debug_infoE
+  Symbol removed: _ZNSt3__124__libcpp_debug_exceptionC2ERKS0_
+  Symbol removed: _ZNSt3__124__libcpp_debug_exceptionC2Ev
+  Symbol removed: _ZNSt3__124__libcpp_debug_exceptionD0Ev
+  Symbol removed: _ZNSt3__124__libcpp_debug_exceptionD1Ev
+  Symbol removed: _ZNSt3__124__libcpp_debug_exceptionD2Ev
+  Symbol removed: _ZNSt3__129__libcpp_throw_debug_functionERKNS_19__libcpp_debug_infoE
+  Symbol removed: _ZTINSt3__124__libcpp_debug_exceptionE
+  Symbol removed: _ZTSNSt3__124__libcpp_debug_exceptionE
+  Symbol removed: _ZTVNSt3__124__libcpp_debug_exceptionE
+
+
+    x86_64-apple-apple-darwin
+    -------------------------
+    Symbol added: __ZNSt3__111__libcpp_db10__insert_cEPvPFPNS_8__c_nodeES1_S1_S3_E
+    Symbol removed: __ZNSt3__111__libcpp_db10__insert_cEPv
+
 * r355367 - Fix -fsanitize=vptr badness in <__debug>
 
   This patch fixes a lifetime bug when inserting a new container into the debug database. It is
   diagnosed by UBSAN when debug mode is enabled. This patch corrects how nodes are constructed
   during insertion.
 
   The fix requires unconditionally breaking the debug mode ABI. Users should not expect ABI
   stability from debug mode.

lib/abi/x86_64-apple-darwin.v1.abilist

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 {'is_defined': True, 'name': '__ZNKSt3__117moneypunct_bynameIwLb1EE14do_frac_digitsEv', 'type': 'FUNC'}
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 {'is_defined': True, 'name': '__ZNKSt3__118__time_get_storageIwE15__do_date_orderEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '__ZNKSt3__119__libcpp_debug_info4whatEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__119__shared_weak_count13__get_deleterERKSt9type_info', 'type': 'FUNC'}
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 {'is_defined': True, 'name': '__ZNKSt3__120__codecvt_utf8_utf16IDiE6do_outER11__mbstate_tPKDiS5_RS5_PcS7_RS7_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNKSt3__120__codecvt_utf8_utf16IDiE9do_lengthER11__mbstate_tPKcS5_m', 'type': 'FUNC'}

 {'is_defined': True, 'name': '__ZNKSt3__120__time_get_c_storageIwE7__weeksEv', 'type': 'FUNC'}
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 {'is_defined': True, 'name': '__ZNKSt3__120__vector_base_commonILb1EE20__throw_out_of_rangeEv', 'type': 'FUNC'}
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 {'is_defined': True, 'name': '__ZNKSt3__15ctypeIcE9do_narrowEcc', 'type': 'FUNC'}

 {'is_defined': True, 'name': '__ZNSt3__121recursive_timed_mutex6unlockEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__121recursive_timed_mutex8try_lockEv', 'type': 'FUNC'}
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 {'is_defined': True, 'name': '__ZNSt3__121recursive_timed_mutexD1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '__ZNSt3__121recursive_timed_mutexD2Ev', 'type': 'FUNC'}
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 {'is_defined': True, 'name': '__ZNSt3__123__libcpp_debug_functionE', 'size': 0, 'type': 'OBJECT'}
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 {'is_defined': True, 'name': '__ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', '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'}
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 {'is_defined': True, 'name': '__ZTVNSt3__27codecvtIDsc11__mbstate_tEE', 'size': 0, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '__ZTVNSt3__27codecvtIcc11__mbstate_tEE', 'size': 0, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '__ZTVNSt3__27codecvtIwc11__mbstate_tEE', 'size': 0, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '__ZTVNSt3__27collateIcEE', 'size': 0, 'type': 'OBJECT'}

lib/abi/x86_64-unknown-linux-gnu.v1.abilist

 {'is_defined': True, 'name': '_ZNKSt3__117moneypunct_bynameIwLb1EE14do_curr_symbolEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__117moneypunct_bynameIwLb1EE14do_frac_digitsEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__117moneypunct_bynameIwLb1EE16do_decimal_pointEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__117moneypunct_bynameIwLb1EE16do_negative_signEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__117moneypunct_bynameIwLb1EE16do_positive_signEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__117moneypunct_bynameIwLb1EE16do_thousands_sepEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__118__time_get_storageIcE15__do_date_orderEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__118__time_get_storageIwE15__do_date_orderEv', 'type': 'FUNC'}
+{'is_defined': True, 'name': '_ZNKSt3__119__libcpp_debug_info4whatEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__119__shared_weak_count13__get_deleterERKSt9type_info', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__120__codecvt_utf8_utf16IDiE10do_unshiftER11__mbstate_tPcS4_RS4_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__120__codecvt_utf8_utf16IDiE11do_encodingEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__120__codecvt_utf8_utf16IDiE13do_max_lengthEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__120__codecvt_utf8_utf16IDiE16do_always_noconvEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__120__codecvt_utf8_utf16IDiE5do_inER11__mbstate_tPKcS5_RS5_PDiS7_RS7_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__120__codecvt_utf8_utf16IDiE6do_outER11__mbstate_tPKDiS5_RS5_PcS7_RS7_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__120__codecvt_utf8_utf16IDiE9do_lengthER11__mbstate_tPKcS5_m', 'type': 'FUNC'}

 {'is_defined': True, 'name': '_ZNKSt3__120__time_get_c_storageIwE7__weeksEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__120__time_get_c_storageIwE8__monthsEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__120__vector_base_commonILb1EE20__throw_length_errorEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__120__vector_base_commonILb1EE20__throw_out_of_rangeEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__121__basic_string_commonILb1EE20__throw_length_errorEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__121__basic_string_commonILb1EE20__throw_out_of_rangeEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__123__match_any_but_newlineIcE6__execERNS_7__stateIcEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__123__match_any_but_newlineIwE6__execERNS_7__stateIwEE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNKSt3__124__libcpp_debug_exception4whatEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__15ctypeIcE10do_tolowerEPcPKc', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__15ctypeIcE10do_tolowerEc', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__15ctypeIcE10do_toupperEPcPKc', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__15ctypeIcE10do_toupperEc', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__15ctypeIcE8do_widenEPKcS3_Pc', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__15ctypeIcE8do_widenEc', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__15ctypeIcE9do_narrowEPKcS3_cPc', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNKSt3__15ctypeIcE9do_narrowEcc', 'type': 'FUNC'}

 {'is_defined': True, 'name': '_ZNSt3__121recursive_timed_mutex6unlockEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__121recursive_timed_mutex8try_lockEv', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__121recursive_timed_mutexC1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__121recursive_timed_mutexC2Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__121recursive_timed_mutexD1Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__121recursive_timed_mutexD2Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__121undeclare_no_pointersEPcm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__123__libcpp_debug_functionE', 'size': 8, 'type': 'OBJECT'}
-{'is_defined': True, 'name': '_ZNSt3__124__libcpp_debug_exceptionC1ERKNS_19__libcpp_debug_infoE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__124__libcpp_debug_exceptionC1ERKS0_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__124__libcpp_debug_exceptionC1Ev', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__124__libcpp_debug_exceptionC2ERKNS_19__libcpp_debug_infoE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__124__libcpp_debug_exceptionC2ERKS0_', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__124__libcpp_debug_exceptionC2Ev', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__124__libcpp_debug_exceptionD0Ev', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__124__libcpp_debug_exceptionD1Ev', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__124__libcpp_debug_exceptionD2Ev', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__125notify_all_at_thread_exitERNS_18condition_variableENS_11unique_lockINS_5mutexEEE', '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': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIllEEPlEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessImmEEPmEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIssEEPsEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIttEEPtEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIwwEEPwEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIxxEEPxEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__insertion_sort_incompleteIRNS_6__lessIyyEEPyEEbT0_S5_T_', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__127__libcpp_set_debug_functionEPFvRKNS_19__libcpp_debug_infoEE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__129__libcpp_abort_debug_functionERKNS_19__libcpp_debug_infoE', 'type': 'FUNC'}
-{'is_defined': True, 'name': '_ZNSt3__129__libcpp_throw_debug_functionERKNS_19__libcpp_debug_infoE', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__13cinE', 'size': 168, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZNSt3__14cerrE', 'size': 160, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZNSt3__14clogE', 'size': 160, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZNSt3__14coutE', 'size': 160, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZNSt3__14stodERKNS_12basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEEPm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__14stodERKNS_12basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEEEPm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__14stofERKNS_12basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEEPm', 'type': 'FUNC'}
 {'is_defined': True, 'name': '_ZNSt3__14stofERKNS_12basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEEEPm', 'type': 'FUNC'}

 {'is_defined': True, 'name': '_ZTINSt3__118__time_get_storageIcEE', 'size': 24, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__118__time_get_storageIwEE', 'size': 24, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__119__shared_weak_countE', 'size': 40, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__120__codecvt_utf8_utf16IDiEE', 'size': 24, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__120__codecvt_utf8_utf16IDsEE', 'size': 24, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__120__codecvt_utf8_utf16IwEE', 'size': 24, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__120__time_get_c_storageIcEE', 'size': 16, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__120__time_get_c_storageIwEE', 'size': 16, 'type': 'OBJECT'}
-{'is_defined': True, 'name': '_ZTINSt3__124__libcpp_debug_exceptionE', 'size': 24, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__15ctypeIcEE', 'size': 56, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__15ctypeIwEE', 'size': 56, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__16locale5facetE', 'size': 24, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__17codecvtIDic11__mbstate_tEE', 'size': 56, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__17codecvtIDsc11__mbstate_tEE', 'size': 56, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__17codecvtIcc11__mbstate_tEE', 'size': 56, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__17codecvtIwc11__mbstate_tEE', 'size': 56, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTINSt3__17collateIcEE', 'size': 24, 'type': 'OBJECT'}

 {'is_defined': True, 'name': '_ZTSNSt3__118__time_get_storageIcEE', 'size': 32, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__118__time_get_storageIwEE', 'size': 32, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__119__shared_weak_countE', 'size': 30, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__120__codecvt_utf8_utf16IDiEE', 'size': 35, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__120__codecvt_utf8_utf16IDsEE', 'size': 35, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__120__codecvt_utf8_utf16IwEE', 'size': 34, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__120__time_get_c_storageIcEE', 'size': 34, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__120__time_get_c_storageIwEE', 'size': 34, 'type': 'OBJECT'}
-{'is_defined': True, 'name': '_ZTSNSt3__124__libcpp_debug_exceptionE', 'size': 35, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__15ctypeIcEE', 'size': 18, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__15ctypeIwEE', 'size': 18, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__16locale5facetE', 'size': 22, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__17codecvtIDic11__mbstate_tEE', 'size': 35, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__17codecvtIDsc11__mbstate_tEE', 'size': 35, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__17codecvtIcc11__mbstate_tEE', 'size': 34, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__17codecvtIwc11__mbstate_tEE', 'size': 34, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTSNSt3__17collateIcEE', 'size': 20, 'type': 'OBJECT'}

 {'is_defined': True, 'name': '_ZTVNSt3__117moneypunct_bynameIcLb0EEE', 'size': 112, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__117moneypunct_bynameIcLb1EEE', 'size': 112, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__117moneypunct_bynameIwLb0EEE', 'size': 112, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__117moneypunct_bynameIwLb1EEE', 'size': 112, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__119__shared_weak_countE', 'size': 56, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__120__codecvt_utf8_utf16IDiEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__120__codecvt_utf8_utf16IDsEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__120__codecvt_utf8_utf16IwEE', 'size': 96, 'type': 'OBJECT'}
-{'is_defined': True, 'name': '_ZTVNSt3__124__libcpp_debug_exceptionE', 'size': 40, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__15ctypeIcEE', 'size': 104, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__15ctypeIwEE', 'size': 136, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__16locale5facetE', 'size': 40, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__17codecvtIDic11__mbstate_tEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__17codecvtIDsc11__mbstate_tEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__17codecvtIcc11__mbstate_tEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__17codecvtIwc11__mbstate_tEE', 'size': 96, 'type': 'OBJECT'}
 {'is_defined': True, 'name': '_ZTVNSt3__17collateIcEE', 'size': 64, 'type': 'OBJECT'}

src/debug.cpp

 #include "algorithm"
 #include "string"
 #include "cstdio"
 #include "__hash_table"
 #include "mutex"
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-static std::string make_what_str(__libcpp_debug_info const& info) {
-  string msg = info.__file_;
-  msg += ":" + to_string(info.__line_) + ": _LIBCPP_ASSERT '";
-  msg += info.__pred_;
+std::string __libcpp_debug_info::what() const {
+  string msg = __file_;
+  msg += ":" + to_string(__line_) + ": _LIBCPP_ASSERT '";
+  msg += __pred_;
   msg += "' failed. ";
-  msg += info.__msg_;
+  msg += __msg_;
   return msg;
 }
+_LIBCPP_NORETURN void __libcpp_abort_debug_function(__libcpp_debug_info const& info) {
+    std::fprintf(stderr, "%s\n", info.what().c_str());
+    std::abort();
+}
 
 _LIBCPP_SAFE_STATIC __libcpp_debug_function_type
     __libcpp_debug_function = __libcpp_abort_debug_function;
 
 bool __libcpp_set_debug_function(__libcpp_debug_function_type __func) {
   __libcpp_debug_function = __func;
   return true;
 }
 
-_LIBCPP_NORETURN void __libcpp_abort_debug_function(__libcpp_debug_info const& info) {
-  std::fprintf(stderr, "%s\n", make_what_str(info).c_str());
-  std::abort();
-}
-
-_LIBCPP_NORETURN void __libcpp_throw_debug_function(__libcpp_debug_info const& info) {
-#ifndef _LIBCPP_NO_EXCEPTIONS
-  throw __libcpp_debug_exception(info);
-#else
-  __libcpp_abort_debug_function(info);
-#endif
-}
-
-struct __libcpp_debug_exception::__libcpp_debug_exception_imp {
-  __libcpp_debug_info __info_;
-  std::string __what_str_;
-};
-
-__libcpp_debug_exception::__libcpp_debug_exception() _NOEXCEPT
-    : __imp_(nullptr) {
-}
-
-__libcpp_debug_exception::__libcpp_debug_exception(
-    __libcpp_debug_info const& info) : __imp_(new __libcpp_debug_exception_imp)
-{
-  __imp_->__info_ = info;
-  __imp_->__what_str_ = make_what_str(info);
-}
-__libcpp_debug_exception::__libcpp_debug_exception(
-    __libcpp_debug_exception const& other) : __imp_(nullptr) {
-  if (other.__imp_)
-    __imp_ = new __libcpp_debug_exception_imp(*other.__imp_);
-}
-
-__libcpp_debug_exception::~__libcpp_debug_exception() _NOEXCEPT {
-  if (__imp_)
-    delete __imp_;
-}
-
-const char* __libcpp_debug_exception::what() const _NOEXCEPT {
-  if (__imp_)
-    return __imp_->__what_str_.c_str();
-  return "__libcpp_debug_exception";
-}
-
 _LIBCPP_FUNC_VIS
 __libcpp_db*
 __get_db()
 {
     static __libcpp_db db;
     return &db;
 }
 

test/libcxx/containers/sequences/array/array.zero/db_back.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
 //
 //===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03
 
-// UNSUPPORTED: libcpp-no-exceptions
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib
 
-// test array<T, 0>::front() throws a debug exception.
+// test array<T, 0>::front() raises a debug error.
 
 #define _LIBCPP_DEBUG 1
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
 #include <array>
-
-template <class Array>
-inline bool CheckDebugThrows(Array& Arr) {
-  try {
-    Arr.back();
-  } catch (std::__libcpp_debug_exception const&) {
-    return true;
-  }
-  return false;
-}
+#include "debug_mode_helper.h"
 
 int main(int, char**)
 {
   {
     typedef std::array<int, 0> C;
     C c = {};
     C const& cc = c;
-    assert(CheckDebugThrows(c));
-    assert(CheckDebugThrows(cc));
+    EXPECT_DEATH( c.back() );
+    EXPECT_DEATH( cc.back() );
   }
   {
     typedef std::array<const int, 0> C;
     C c = {{}};
     C const& cc = c;
-    assert(CheckDebugThrows(c));
-    assert(CheckDebugThrows(cc));
+    EXPECT_DEATH( c.back() );
+    EXPECT_DEATH( cc.back() );
   }
 
   return 0;
 }

test/libcxx/containers/sequences/array/array.zero/db_front.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
 //
 //===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03
 
-// UNSUPPORTED: libcpp-no-exceptions
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib
 
-// test array<T, 0>::front() throws a debug exception.
+// test array<T, 0>::front() raises a debug error.
 
 #define _LIBCPP_DEBUG 1
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
 #include <array>
-
-template <class Array>
-inline bool CheckDebugThrows(Array& Arr) {
-  try {
-    Arr.front();
-  } catch (std::__libcpp_debug_exception const&) {
-    return true;
-  }
-  return false;
-}
+#include "debug_mode_helper.h"
 
 int main(int, char**)
 {
   {
     typedef std::array<int, 0> C;
     C c = {};
     C const& cc = c;
-    assert(CheckDebugThrows(c));
-    assert(CheckDebugThrows(cc));
+    EXPECT_DEATH(c.front());
+    EXPECT_DEATH(cc.front());
   }
   {
     typedef std::array<const int, 0> C;
     C c = {{}};
     C const& cc = c;
-    assert(CheckDebugThrows(c));
-    assert(CheckDebugThrows(cc));
+    EXPECT_DEATH(c.front());
+    EXPECT_DEATH(cc.front());
   }
 
   return 0;
 }

test/libcxx/containers/sequences/array/array.zero/db_indexing.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
 //
 //===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++98, c++03
 
-// UNSUPPORTED: libcpp-no-exceptions
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib
 
-// test array<T, 0>::operator[] throws a debug exception.
+// test array<T, 0>::operator[] raises a debug error.
 
 #define _LIBCPP_DEBUG 1
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
 #include <array>
-
-template <class Array>
-inline bool CheckDebugThrows(Array& Arr, size_t Index) {
-  try {
-    Arr[Index];
-  } catch (std::__libcpp_debug_exception const&) {
-    return true;
-  }
-  return false;
-}
+#include "debug_mode_helper.h"
 
 int main(int, char**)
 {
   {
     typedef std::array<int, 0> C;
     C c = {};
     C const& cc = c;
-    assert(CheckDebugThrows(c, 0));
-    assert(CheckDebugThrows(c, 1));
-    assert(CheckDebugThrows(cc, 0));
-    assert(CheckDebugThrows(cc, 1));
+    EXPECT_DEATH( c[0] );
+    EXPECT_DEATH( c[1] );
+    EXPECT_DEATH( cc[0] );
+    EXPECT_DEATH( cc[1] );
   }
   {
     typedef std::array<const int, 0> C;
     C c = {{}};
     C const& cc = c;
-    assert(CheckDebugThrows(c, 0));
-    assert(CheckDebugThrows(c, 1));
-    assert(CheckDebugThrows(cc, 0));
-    assert(CheckDebugThrows(cc, 1));
+    EXPECT_DEATH( c[0] );
+    EXPECT_DEATH( c[1] );
+    EXPECT_DEATH( cc[0] );
+    EXPECT_DEATH( cc[1] );
   }
 
   return 0;
 }

test/libcxx/debug/containers/db_associative_container_tests.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
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
-// UNSUPPORTED: libcpp-no-exceptions, libcpp-no-if-constexpr
+// UNSUPPORTED: libcpp-no-if-constexpr
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib
 
 // test container debugging
 
 #define _LIBCPP_DEBUG 1
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
 
 #include <map>
 #include <set>
 #include <utility>
 #include <cassert>
+#include "container_debug_tests.hpp"
 #include "debug_mode_helper.h"
 
 using namespace IteratorDebugChecks;
 
 template <class Container, ContainerType CT>
 struct AssociativeContainerChecks : BasicContainerChecks<Container, CT> {
   using Base = BasicContainerChecks<Container, CT>;
   using value_type = typename Container::value_type;
   using iterator = typename Container::iterator;
   using const_iterator = typename Container::const_iterator;
   using traits = std::iterator_traits<iterator>;
   using category = typename traits::iterator_category;
 
   using Base::makeContainer;
 public:
   static void run() {
     Base::run();
-    try {
-     // FIXME Add tests
-    } catch (...) {
-      assert(false && "uncaught debug exception");
-    }
   }
 
 private:
   // FIXME Add tests here
 };
 
 int main(int, char**)
 {

test/libcxx/debug/containers/db_sequence_container_iterators.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
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
-// UNSUPPORTED: libcpp-no-exceptions, libcpp-no-if-constexpr
+// UNSUPPORTED: libcpp-no-if-constexpr
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib
 
 // test container debugging
 
 #define _LIBCPP_DEBUG 1
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
+
 #include <forward_list>
 #include <list>
 #include <vector>
 #include <deque>
+#include "container_debug_tests.hpp"
 #include "debug_mode_helper.h"
 
 using namespace IteratorDebugChecks;
 
 template <class Container, ContainerType CT>
 struct SequenceContainerChecks : BasicContainerChecks<Container, CT> {
   using Base = BasicContainerChecks<Container, CT>;
   using value_type = typename Container::value_type;
   using allocator_type = typename Container::allocator_type;
   using iterator = typename Container::iterator;
   using const_iterator = typename Container::const_iterator;
 
   using Base::makeContainer;
   using Base::makeValueType;
 public:
   static void run() {
     Base::run();
-    try {
-      SanityTest();
-      FrontOnEmptyContainer();
 
-      if constexpr (CT != CT_ForwardList) {
+    if constexpr(CT != CT_ForwardList) {
         AssignInvalidates();
         BackOnEmptyContainer();
         InsertIterValue();
         InsertIterSizeValue();
         InsertIterIterIter();
         EmplaceIterValue();
         EraseIterIter();
-      } else {
-        SpliceFirstElemAfter();
-      }
-      if constexpr (CT == CT_Vector || CT == CT_Deque || CT == CT_List) {
-        PopBack();
-      }
-      if constexpr (CT == CT_List || CT == CT_Deque) {
-        PopFront(); // FIXME: Run with forward list as well
-      }
-      if constexpr (CT == CT_List || CT == CT_ForwardList) {
-        RemoveFirstElem();
-      }
-      if constexpr (CT == CT_List) {
-        SpliceFirstElem();
-        SpliceSameContainer();
-      }
-    } catch (...) {
-      assert(false && "uncaught debug exception");
-    }
+      }
+    else {
   }
 
 private:
   static void SanityTest() {
     CHECKPOINT("sanity test");
     Container C = {1, 1, 1, 1};
     ::DoNotOptimize(&C);
   }
static void AssignInvalidates() {
     iterator it1, it2, it3;
     auto reset = [&]() {
       C = makeContainer(3);
       it1 = C.begin();
       it2 = ++C.begin();
       it3 = C.end();
     };
     auto check = [&]() {
-      CHECK_DEBUG_THROWS( C.erase(it1) );
-      CHECK_DEBUG_THROWS( C.erase(it2) );
-      CHECK_DEBUG_THROWS( C.erase(it3, C.end()) );
+      EXPECT_DEATH( C.erase(it1) );
+      EXPECT_DEATH( C.erase(it2) );
+      EXPECT_DEATH( C.erase(it3, C.end()) );
     };
     reset();
     C.assign(2, makeValueType(4));
     check();
     reset();
     CHECKPOINT("assign(Iter, Iter)");
     std::vector<value_type> V = {
         makeValueType(1),
private:
 
   static void BackOnEmptyContainer() {
     CHECKPOINT("testing back on empty");
     Container C = makeContainer(1);
     Container const& CC = C;
     (void)C.back();
     (void)CC.back();
     C.clear();
-    CHECK_DEBUG_THROWS( C.back() );
-    CHECK_DEBUG_THROWS( CC.back() );
+    EXPECT_DEATH( C.back() );
+    EXPECT_DEATH( CC.back() );
   }
 
   static void FrontOnEmptyContainer() {
     CHECKPOINT("testing front on empty");
     Container C = makeContainer(1);
     Container const& CC = C;
     (void)C.front();
     (void)CC.front();
     C.clear();
-    CHECK_DEBUG_THROWS( C.front() );
-    CHECK_DEBUG_THROWS( CC.front() );
+    EXPECT_DEATH( C.front() );
+    EXPECT_DEATH( CC.front() );
   }
 
   static void EraseIterIter() {
     CHECKPOINT("testing erase iter iter invalidation");
     Container C1 = makeContainer(3);
     iterator it1 = C1.begin();
     iterator it1_next = ++C1.begin();
     iterator it1_after_next = ++C1.begin();
     ++it1_after_next;
     iterator it1_back = --C1.end();
     assert(it1_next != it1_back);
     if (CT == CT_Vector) {
-      CHECK_DEBUG_THROWS( C1.erase(it1_next, it1) ); // bad range
+      EXPECT_DEATH( C1.erase(it1_next, it1) ); // bad range
     }
     C1.erase(it1, it1_after_next);
-    CHECK_DEBUG_THROWS( C1.erase(it1) );
-    CHECK_DEBUG_THROWS( C1.erase(it1_next) );
+    EXPECT_DEATH( C1.erase(it1) );
+    EXPECT_DEATH( C1.erase(it1_next) );
     if (CT == CT_List) {
       C1.erase(it1_back);
     } else {
-      CHECK_DEBUG_THROWS( C1.erase(it1_back) );
+      EXPECT_DEATH( C1.erase(it1_back) );
     }
   }
 
   static void PopBack() {
     CHECKPOINT("testing  pop_back() invalidation");
     Container C1 = makeContainer(2);
     iterator it1 = C1.end();
     --it1;
     C1.pop_back();
-    CHECK_DEBUG_THROWS( C1.erase(it1) );
+    EXPECT_DEATH( C1.erase(it1) );
     C1.erase(C1.begin());
     assert(C1.size() == 0);
-    CHECK_DEBUG_THROWS( C1.pop_back() );
+    EXPECT_DEATH( C1.pop_back() );
   }
 
   static void PopFront() {
     CHECKPOINT("testing pop_front() invalidation");
     Container C1 = makeContainer(2);
     iterator it1 = C1.begin();
     C1.pop_front();
-    CHECK_DEBUG_THROWS( C1.erase(it1) );
+    EXPECT_DEATH( C1.erase(it1) );
     C1.erase(C1.begin());
     assert(C1.size() == 0);
-    CHECK_DEBUG_THROWS( C1.pop_front() );
+    EXPECT_DEATH( C1.pop_front() );
   }
 
   static void InsertIterValue() {
     CHECKPOINT("testing insert(iter, value)");
     Container C1 = makeContainer(2);
     iterator it1 = C1.begin();
     iterator it1_next = it1;
     ++it1_next;
     Container C2 = C1;
     const value_type value = makeValueType(3);
     value_type rvalue = makeValueType(3);
-    CHECK_DEBUG_THROWS( C2.insert(it1, value) ); // wrong container
-    CHECK_DEBUG_THROWS( C2.insert(it1, std::move(rvalue)) ); // wrong container
+    EXPECT_DEATH( C2.insert(it1, value) ); // wrong container
+    EXPECT_DEATH( C2.insert(it1, std::move(rvalue)) ); // wrong container
     C1.insert(it1_next, value);
     if  (CT == CT_List) {
       C1.insert(it1_next, value);
       C1.insert(it1, value);
       C1.insert(it1_next, std::move(rvalue));
       C1.insert(it1, std::move(rvalue));
     } else {
-      CHECK_DEBUG_THROWS( C1.insert(it1_next, value) ); // invalidated iterator
-      CHECK_DEBUG_THROWS( C1.insert(it1, value) ); // invalidated iterator
-      CHECK_DEBUG_THROWS( C1.insert(it1_next, std::move(rvalue)) ); // invalidated iterator
-      CHECK_DEBUG_THROWS( C1.insert(it1, std::move(rvalue)) ); // invalidated iterator
+      EXPECT_DEATH( C1.insert(it1_next, value) ); // invalidated iterator
+      EXPECT_DEATH( C1.insert(it1, value) ); // invalidated iterator
+      EXPECT_DEATH( C1.insert(it1_next, std::move(rvalue)) ); // invalidated iterator
+      EXPECT_DEATH( C1.insert(it1, std::move(rvalue)) ); // invalidated iterator
     }
   }
 
   static void EmplaceIterValue() {
     CHECKPOINT("testing emplace(iter, value)");
     Container C1 = makeContainer(2);
     iterator it1 = C1.begin();
     iterator it1_next = it1;
     ++it1_next;
     Container C2 = C1;
     const value_type value = makeValueType(3);
-    CHECK_DEBUG_THROWS( C2.emplace(it1, value) ); // wrong container
-    CHECK_DEBUG_THROWS( C2.emplace(it1, makeValueType(4)) ); // wrong container
+    EXPECT_DEATH( C2.emplace(it1, value) ); // wrong container
+    EXPECT_DEATH( C2.emplace(it1, makeValueType(4)) ); // wrong container
     C1.emplace(it1_next, value);
     if  (CT == CT_List) {
       C1.emplace(it1_next, value);
       C1.emplace(it1, value);
     } else {
-      CHECK_DEBUG_THROWS( C1.emplace(it1_next, value) ); // invalidated iterator
-      CHECK_DEBUG_THROWS( C1.emplace(it1, value) ); // invalidated iterator
+      EXPECT_DEATH( C1.emplace(it1_next, value) ); // invalidated iterator
+      EXPECT_DEATH( C1.emplace(it1, value) ); // invalidated iterator
     }
   }
 
   static void InsertIterSizeValue() {
     CHECKPOINT("testing insert(iter, size, value)");
     Container C1 = makeContainer(2);
     iterator it1 = C1.begin();
     iterator it1_next = it1;
     ++it1_next;
     Container C2 = C1;
     const value_type value = makeValueType(3);
-    CHECK_DEBUG_THROWS( C2.insert(it1, 1, value) ); // wrong container
+    EXPECT_DEATH( C2.insert(it1, 1, value) ); // wrong container
     C1.insert(it1_next, 2, value);
     if  (CT == CT_List) {
       C1.insert(it1_next, 3, value);
       C1.insert(it1, 1, value);
     } else {
-      CHECK_DEBUG_THROWS( C1.insert(it1_next, 1, value) ); // invalidated iterator
-      CHECK_DEBUG_THROWS( C1.insert(it1, 1, value) ); // invalidated iterator
+      EXPECT_DEATH( C1.insert(it1_next, 1, value) ); // invalidated iterator
+      EXPECT_DEATH( C1.insert(it1, 1, value) ); // invalidated iterator
     }
   }
 
   static void InsertIterIterIter() {
     CHECKPOINT("testing insert(iter, iter, iter)");
     Container C1 = makeContainer(2);
     iterator it1 = C1.begin();
     iterator it1_next = it1;
     ++it1_next;
     Container C2 = C1;
     std::vector<value_type> V = {
         makeValueType(1),
         makeValueType(2),
         makeValueType(3)
     };
-    CHECK_DEBUG_THROWS( C2.insert(it1, V.begin(), V.end()) ); // wrong container
+    EXPECT_DEATH( C2.insert(it1, V.begin(), V.end()) ); // wrong container
     C1.insert(it1_next, V.begin(), V.end());
     if  (CT == CT_List) {
       C1.insert(it1_next, V.begin(), V.end());
       C1.insert(it1, V.begin(), V.end());
     } else {
-      CHECK_DEBUG_THROWS( C1.insert(it1_next, V.begin(), V.end()) ); // invalidated iterator
-      CHECK_DEBUG_THROWS( C1.insert(it1, V.begin(), V.end()) ); // invalidated iterator
+      EXPECT_DEATH( C1.insert(it1_next, V.begin(), V.end()) ); // invalidated iterator
+      EXPECT_DEATH( C1.insert(it1, V.begin(), V.end()) ); // invalidated iterator
     }
   }
 };
 
 int main(int, char**)
 {
   using Alloc = test_allocator<int>;
   {

test/libcxx/debug/containers/db_string.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
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
-// UNSUPPORTED: libcpp-no-exceptions, libcpp-no-if-constexpr
+// UNSUPPORTED: libcpp-no-if-constexpr
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib
 
 // test container debugging
 
 #define _LIBCPP_DEBUG 1
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
 #include <string>
 #include <vector>
 
 #include "test_macros.h"
+#include "container_debug_tests.hpp"
 #include "debug_mode_helper.h"
 
 using namespace IteratorDebugChecks;
 
 typedef std::basic_string<char, std::char_traits<char>, test_allocator<char>>  StringType;
 
 template <class Container = StringType, ContainerType CT = CT_String>
 struct StringContainerChecks : BasicContainerChecks<Container, CT> {
   using Base = BasicContainerChecks<Container, CT_String>;
   using value_type = typename Container::value_type;
   using allocator_type = typename Container::allocator_type;
   using iterator = typename Container::iterator;
   using const_iterator = typename Container::const_iterator;
 
   using Base::makeContainer;
   using Base::makeValueType;
 
 public:
   static void run() {
     Base::run_iterator_tests();
     Base::run_allocator_aware_tests();
-    try {
-      for (int N : {3, 128}) {
-        FrontOnEmptyContainer(N);
-        BackOnEmptyContainer(N);
-        PopBack(N);
-      }
-    } catch (...) {
-      assert(false && "uncaught debug exception");
-    }
+
   }
 
 private:
   static void BackOnEmptyContainer(int N) {
     CHECKPOINT("testing back on empty");
     Container C = makeContainer(N);
     Container const& CC = C;
     iterator it = --C.end();
     (void)C.back();
     (void)CC.back();
     C.pop_back();
-    CHECK_DEBUG_THROWS( C.erase(it) );
+    EXPECT_DEATH( C.erase(it) );
     C.clear();
-    CHECK_DEBUG_THROWS( C.back() );
-    CHECK_DEBUG_THROWS( CC.back() );
+    EXPECT_DEATH( C.back() );
+    EXPECT_DEATH( CC.back() );
   }
 
   static void FrontOnEmptyContainer(int N) {
     CHECKPOINT("testing front on empty");
     Container C = makeContainer(N);
     Container const& CC = C;
     (void)C.front();
     (void)CC.front();
     C.clear();
-    CHECK_DEBUG_THROWS( C.front() );
-    CHECK_DEBUG_THROWS( CC.front() );
+    EXPECT_DEATH( C.front() );
+    EXPECT_DEATH( CC.front() );
   }
 
   static void PopBack(int N) {
     CHECKPOINT("testing pop_back() invalidation");
     Container C1 = makeContainer(N);
     iterator it1 = C1.end();
     --it1;
     C1.pop_back();
-    CHECK_DEBUG_THROWS( C1.erase(it1) );
+    EXPECT_DEATH( C1.erase(it1) );
     C1.erase(C1.begin(), C1.end());
     assert(C1.size() == 0);
-    CHECK_DEBUG_THROWS( C1.pop_back() );
+    EXPECT_DEATH_MATCHES(DebugInfoMatcher("string::pop_back(): string is already empty"), C1.pop_back() );
   }
 };
 
 int main(int, char**)
 {
   StringContainerChecks<>::run();
 
   return 0;
 }

test/libcxx/debug/containers/db_unord_container_tests.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
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03, c++11, c++14
-// UNSUPPORTED: libcpp-no-exceptions, libcpp-no-if-constexpr
+// UNSUPPORTED: libcpp-no-if-constexpr
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib
 
 // test container debugging
 
 #define _LIBCPP_DEBUG 1
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
 #include <unordered_map>
 #include <unordered_set>
 #include <utility>
 #include <cassert>
+#include "container_debug_tests.hpp"
 #include "debug_mode_helper.h"
 
 using namespace IteratorDebugChecks;
 
 template <class Container, ContainerType CT>
 struct UnorderedContainerChecks : BasicContainerChecks<Container, CT> {
   using Base = BasicContainerChecks<Container, CT>;
   using value_type = typename Container::value_type;
   using iterator = typename Container::iterator;
   using const_iterator = typename Container::const_iterator;
   using traits = std::iterator_traits<iterator>;
   using category = typename traits::iterator_category;
 
   using Base::makeContainer;
 public:
   static void run() {
     Base::run();
-    try {
-     // FIXME
-    } catch (...) {
-      assert(false && "uncaught debug exception");
-    }
   }
 private:
 
 };
 
 int main(int, char**)
 {
   using SetAlloc = test_allocator<int>;

test/libcxx/debug/debug_register.pass.cpp

 // -*- 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
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: libcpp-no-exceptions
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib
 
-// Test that defining _LIBCPP_DEBUG_USE_EXCEPTIONS causes _LIBCPP_ASSERT
-// to throw on failure.
-
 #define _LIBCPP_DEBUG 1
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
 
 #include <cstdlib>
-#include <exception>
+#include <string>
 #include <type_traits>
 #include <__debug>
 #include <cassert>
 
+void my_debug_function(std::__libcpp_debug_info const& info) {
+  assert(info.__msg_ == std::string("foo"));
+  std::exit(0);
+}
+
 int main(int, char**)
 {
-  try {
-    _LIBCPP_ASSERT(false, "foo");
-    assert(false);
-  } catch (...) {}
-
-  return 0;
+  std::__libcpp_set_debug_function(&my_debug_function);
+  return 1;
 }

test/libcxx/debug/debug_throw.pass.cpp

-// -*- 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
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: libcpp-no-exceptions
-// MODULES_DEFINES: _LIBCPP_DEBUG=0
-
-// Can't test the system lib because this test enables debug mode
-// UNSUPPORTED: with_system_cxx_lib
-
-// Test that the default debug handler can be overridden and test the
-// throwing debug handler.
-
-#define _LIBCPP_DEBUG 0
-
-#include <cstdlib>
-#include <exception>
-#include <type_traits>
-#include <__debug>
-
-int main(int, char**)
-{
-  {
-    std::__libcpp_debug_function = std::__libcpp_throw_debug_function;
-    try {
-      _LIBCPP_ASSERT(false, "foo");
-    } catch (std::__libcpp_debug_exception const&) {}
-  }
-  {
-    // test that the libc++ exception type derives from std::exception
-    static_assert((std::is_base_of<std::exception,
-                                  std::__libcpp_debug_exception
-                  >::value), "must be an exception");
-  }
-
-  return 0;
-}

test/libcxx/input.output/filesystems/class.path/path.itr/iterator_db.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
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++98, c++03
-// UNSUPPORTED: libcpp-no-exceptions
 
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 // MODULES_DEFINES: _LIBCPP_DEBUG=0
 
 // <filesystem>
 
 // class path
 
 #define _LIBCPP_DEBUG 0
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
 #include "filesystem_include.hpp"
 #include <iterator>
 #include <type_traits>
 #include <cassert>
 
 #include "test_macros.h"
 #include "filesystem_test_helper.hpp"
+#include "debug_mode_helper.h"
 
 int main(int, char**) {
   using namespace fs;
-  using ExType = std::__libcpp_debug_exception;
   // Test incrementing/decrementing a singular iterator
   {
     path::iterator singular;
-    try {
-      ++singular;
-      assert(false);
-    } catch (ExType const&) {}
-    try {
-      --singular;
-      assert(false);
-    } catch (ExType const&) {}
+    EXPECT_DEATH( ++singular );
+    EXPECT_DEATH( --singular );
   }
   // Test decrementing the begin iterator
   {
     path p("foo/bar");
     auto it = p.begin();
-    try {
-      --it;
-      assert(false);
-    } catch (ExType const&) {}
-    ++it;
     ++it;
-    try {
-      ++it;
-      assert(false);
-    } catch (ExType const&) {}
+    EXPECT_DEATH( ++it );
   }
   // Test incrementing the end iterator
   {
     path p("foo/bar");
     auto it = p.end();
-    try {
-      ++it;
-      assert(false);
-    } catch (ExType const&) {}
-    --it;
+    EXPECT_DEATH( ++it );
     --it;
-    try {
-      --it;
-      assert(false);
-    } catch (ExType const&) {}
+    EXPECT_DEATH( --it );
   }
 
   return 0;
 }

test/libcxx/thread/futures/futures.promise/set_exception.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
 //
 //===----------------------------------------------------------------------===//
 
-// UNSUPPORTED: libcpp-no-exceptions
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03
 
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 // MODULES_DEFINES: _LIBCPP_DEBUG=0
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib
 
 // <future>
 
 // class promise<R>
 
 // void set_exception(exception_ptr p);
 // Test that a null exception_ptr is diagnosed.
 
 #define _LIBCPP_DEBUG 0
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
+
 #include <future>
 #include <exception>
 #include <cstdlib>
 #include <cassert>
 
 
+#include "debug_mode_helper.h"
+
 int main(int, char**)
 {
-    typedef std::__libcpp_debug_exception ExType;
     {
         typedef int T;
         std::promise<T> p;
-        try {
-            p.set_exception(std::exception_ptr());
-            assert(false);
-        } catch (ExType const&) {
-        }
+
+        EXPECT_DEATH( p.set_exception(std::exception_ptr()) );
     }
     {
         typedef int& T;
         std::promise<T> p;
-        try {
-            p.set_exception(std::exception_ptr());
-            assert(false);
-        } catch (ExType const&) {
-        }
+
+        EXPECT_DEATH( p.set_exception(std::exception_ptr()) );
     }
 
   return 0;
 }

test/libcxx/thread/futures/futures.promise/set_exception_at_thread_exit.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
 //
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: libcpp-no-exceptions
 // UNSUPPORTED: libcpp-has-no-threads
 // UNSUPPORTED: c++98, c++03
 
-// MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 // MODULES_DEFINES: _LIBCPP_DEBUG=0
 
 // Can't test the system lib because this test enables debug mode
 // UNSUPPORTED: with_system_cxx_lib
 
 // <future>
 
 // class promise<R>
 
 // void set_exception_on_thread_exit(exception_ptr p);
 // Test that a null exception_ptr is diagnosed.
 
 #define _LIBCPP_DEBUG 0
-#define _LIBCPP_DEBUG_USE_EXCEPTIONS
 #include <future>
 #include <exception>
 #include <cstdlib>
 #include <cassert>
+#include "debug_mode_helper.h"
 
 
 int main(int, char**)
 {
-    typedef std::__libcpp_debug_exception ExType;
     {
         typedef int T;
         std::promise<T> p;
-        try {
-            p.set_exception_at_thread_exit(std::exception_ptr());
-            assert(false);
-        } catch (ExType const& value) {
-        }
+
+        EXPECT_DEATH( p.set_exception_at_thread_exit(std::exception_ptr()) );
+
     }
     {
         typedef int& T;
         std::promise<T> p;
-        try {
-            p.set_exception_at_thread_exit(std::exception_ptr());
-            assert(false);
-        } catch (ExType const& value) {
-        }
+
+        EXPECT_DEATH( p.set_exception_at_thread_exit(std::exception_ptr()) );
     }
 
   return 0;
 }

test/support/container_debug_tests.hpp

+//===----------------------------------------------------------------------===//
+//
+// 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 TEST_SUPPORT_CONTAINER_DEBUG_TESTS_H
+#define TEST_SUPPORT_CONTAINER_DEBUG_TESTS_H
+
+#include <ciso646>
+#ifndef _LIBCPP_VERSION
+#error This header may only be used for libc++ tests"
+#endif
+
+#ifndef _LIBCPP_DEBUG
+#error _LIBCPP_DEBUG must be defined before including this header
+#endif
+
+#include <__debug>
+#include <utility>
+#include <cstddef>
+#include <cstdlib>
+#include <cassert>
+#include <string>
+#include <sstream>
+#include <iostream>
+
+#include "test_macros.h"
+#include "debug_mode_helper.h"
+#include "assert_checkpoint.h"
+#include "test_allocator.h"
+
+// These test make use of 'if constexpr'.
+#if TEST_STD_VER <= 14
+#error This header may only be used in C++17 and greater
+#endif
+
+#ifndef __cpp_if_constexpr
+#error These tests require if constexpr
+#endif
+
+
+namespace IteratorDebugChecks {
+
+enum ContainerType {
+  CT_None,
+  CT_String,
+  CT_Vector,
+  CT_VectorBool,
+  CT_List,
+  CT_Deque,
+  CT_ForwardList,
+  CT_Map,
+  CT_Set,
+  CT_MultiMap,
+  CT_MultiSet,
+  CT_UnorderedMap,
+  CT_UnorderedSet,
+  CT_UnorderedMultiMap,
+  CT_UnorderedMultiSet
+};
+
+constexpr bool isSequential(ContainerType CT) {
+  return CT_Vector >= CT && CT_ForwardList <= CT;
+}
+
+constexpr bool isAssociative(ContainerType CT) {
+  return CT_Map >= CT && CT_MultiSet <= CT;
+}
+
+constexpr bool isUnordered(ContainerType CT) {
+  return CT_UnorderedMap >= CT && CT_UnorderedMultiSet <= CT;
+}
+
+constexpr bool isSet(ContainerType CT) {
+  return CT == CT_Set
+      || CT == CT_MultiSet
+      || CT == CT_UnorderedSet
+      || CT == CT_UnorderedMultiSet;
+}
+
+constexpr bool isMap(ContainerType CT) {
+  return CT == CT_Map
+      || CT == CT_MultiMap
+      || CT == CT_UnorderedMap
+      || CT == CT_UnorderedMultiMap;
+}
+
+constexpr bool isMulti(ContainerType CT) {
+  return CT == CT_MultiMap
+      || CT == CT_MultiSet
+      || CT == CT_UnorderedMultiMap
+      || CT == CT_UnorderedMultiSet;
+}
+
+template <class Container, class ValueType = typename Container::value_type>
+struct ContainerDebugHelper {
+  static_assert(std::is_constructible<ValueType, int>::value,
+                "must be constructible from int");
+
+  static ValueType makeValueType(int val = 0, int = 0) {
+    return ValueType(val);
+  }
+};
+
+template <class Container>
+struct ContainerDebugHelper<Container, char> {
+  static char makeValueType(int = 0, int = 0) {
+    return 'A';
+  }
+};
+
+template <class Container, class Key, class Value>
+struct ContainerDebugHelper<Container, std::pair<const Key, Value> > {
+  using ValueType = std::pair<const Key, Value>;
+  static_assert(std::is_constructible<Key, int>::value,
+                "must be constructible from int");
+  static_assert(std::is_constructible<Value, int>::value,
+                "must be constructible from int");
+
+  static ValueType makeValueType(int key = 0, int val = 0) {
+    return ValueType(key, val);
+  }
+};
+
+template <class Container, ContainerType CT,
+    class Helper = ContainerDebugHelper<Container> >
+struct BasicContainerChecks {
+  using value_type = typename Container::value_type;
+  using iterator = typename Container::iterator;
+  using const_iterator = typename Container::const_iterator;
+  using allocator_type = typename Container::allocator_type;
+  using traits = std::iterator_traits<iterator>;
+  using category = typename traits::iterator_category;
+
+  static_assert(std::is_same<test_allocator<value_type>, allocator_type>::value,
+                "the container must use a test allocator");
+
+  static constexpr bool IsBiDir =
+      std::is_convertible<category, std::bidirectional_iterator_tag>::value;
+
+ public:
+  static void run() {
+    run_iterator_tests();
+    run_container_tests();
+    run_allocator_aware_tests();
+  }
+
+  static void run_iterator_tests() {
+    try {
+      TestNullIterators<iterator>();
+      TestNullIterators<const_iterator>();
+      if constexpr (IsBiDir) { DecrementBegin(); }
+      IncrementEnd();
+      DerefEndIterator();
+    } catch (...) {
+      assert(false && "uncaught debug exception");
+    }
+  }
+
+  static void run_container_tests() {
+    try {
+      CopyInvalidatesIterators();
+      MoveInvalidatesIterators();
+      if constexpr (CT != CT_ForwardList) {
+        EraseIter();
+        EraseIterIter();
+      }
+    } catch (...) {
+      assert(false && "uncaught debug exception");
+    }
+  }
+
+  static void run_allocator_aware_tests() {
+    try {
+      SwapNonEqualAllocators();
+      if constexpr (CT != CT_ForwardList ) {
+        // FIXME: This should work for both forward_list and string
+        SwapInvalidatesIterators();
+      }
+    } catch (...) {
+      assert(false && "uncaught debug exception");
+    }
+  }
+
+  static Container makeContainer(int size, allocator_type A = allocator_type()) {
+    Container C(A);
+    if constexpr (CT == CT_ForwardList) {
+      for (int i = 0; i < size; ++i)
+        C.insert_after(C.before_begin(), Helper::makeValueType(i));
+    } else {
+      for (int i = 0; i < size; ++i)
+        C.insert(C.end(), Helper::makeValueType(i));
+      assert(C.size() == static_cast<std::size_t>(size));
+    }
+    return C;
+  }
+
+  static value_type makeValueType(int value) {
+    return Helper::makeValueType(value);
+  }
+
+ private:
+  // Iterator tests
+  template <class Iter>
+  static void TestNullIterators() {
+    CHECKPOINT("testing null iterator");
+    Iter it;
+    EXPECT_DEATH( ++it );
+    EXPECT_DEATH( it++ );
+    EXPECT_DEATH( *it );
+    if constexpr (CT != CT_VectorBool) {
+      EXPECT_DEATH( it.operator->() );
+    }
+    if constexpr (IsBiDir) {
+      EXPECT_DEATH( --it );
+      EXPECT_DEATH( it-- );
+    }
+  }
+
+  static void DecrementBegin() {
+    CHECKPOINT("testing decrement on begin");
+    Container C = makeContainer(1);
+    iterator i = C.end();
+    const_iterator ci = C.cend();
+    --i;
+    --ci;
+    assert(i == C.begin());
+    EXPECT_DEATH( --i );
+    EXPECT_DEATH( i-- );
+    EXPECT_DEATH( --ci );
+    EXPECT_DEATH( ci-- );
+  }
+
+  static void IncrementEnd() {
+    CHECKPOINT("testing increment on end");
+    Container C = makeContainer(1);
+    iterator i = C.begin();
+    const_iterator ci = C.begin();
+    ++i;
+    ++ci;
+    assert(i == C.end());
+    EXPECT_DEATH( ++i );
+    EXPECT_DEATH( i++ );
+    EXPECT_DEATH( ++ci );
+    EXPECT_DEATH( ci++ );
+  }
+
+  static void DerefEndIterator() {
+    CHECKPOINT("testing deref end iterator");
+    Container C = makeContainer(1);
+    iterator i = C.begin();
+    const_iterator ci = C.cbegin();
+    (void)*i; (void)*ci;
+    if constexpr (CT != CT_VectorBool) {
+      i.operator->();
+      ci.operator->();
+    }
+    ++i; ++ci;
+    assert(i == C.end());
+    EXPECT_DEATH( *i );
+    EXPECT_DEATH( *ci );
+    if constexpr (CT != CT_VectorBool) {
+      EXPECT_DEATH( i.operator->() );
+      EXPECT_DEATH( ci.operator->() );
+    }
+  }
+
+  // Container tests
+  static void CopyInvalidatesIterators() {
+    CHECKPOINT("copy invalidates iterators");
+    Container C1 = makeContainer(3);
+    iterator i = C1.begin();
+    Container C2 = C1;
+    if constexpr (CT == CT_ForwardList) {
+      iterator i_next = i;
+      ++i_next;
+      (void)*i_next;
+      EXPECT_DEATH( C2.erase_after(i) );
+      C1.erase_after(i);
+      EXPECT_DEATH( *i_next );
+    } else {
+      EXPECT_DEATH( C2.erase(i) );
+      (void)*i;
+      C1.erase(i);
+      EXPECT_DEATH( *i );
+    }
+  }
+
+  static void MoveInvalidatesIterators() {
+    CHECKPOINT("copy move invalidates iterators");
+    Container C1 = makeContainer(3);
+    iterator i = C1.begin();
+    Container C2 = std::move(C1);
+    (void) *i;
+    if constexpr (CT == CT_ForwardList) {
+      EXPECT_DEATH( C1.erase_after(i) );
+      C2.erase_after(i);
+    } else {
+      EXPECT_DEATH( C1.erase(i) );
+      C2.erase(i);
+      EXPECT_DEATH(*i);
+    }
+  }
+
+  static void EraseIter() {
+    CHECKPOINT("testing erase invalidation");
+    Container C1 = makeContainer(2);
+    iterator it1 = C1.begin();
+    iterator it1_next = it1;
+    ++it1_next;
+    Container C2 = C1;
+    EXPECT_DEATH( C2.erase(it1) ); // wrong container
+    EXPECT_DEATH( C2.erase(C2.end()) ); // erase with end
+    C1.erase(it1_next);
+    EXPECT_DEATH( C1.erase(it1_next) ); // invalidated iterator
+    C1.erase(it1);
+    EXPECT_DEATH( C1.erase(it1) ); // invalidated iterator
+  }
+
+  static void EraseIterIter() {
+    CHECKPOINT("testing erase iter iter invalidation");
+    Container C1 = makeContainer(2);
+    iterator it1 = C1.begin();
+    iterator it1_next = it1;
+    ++it1_next;
+    Container C2 = C1;
+    iterator it2 = C2.begin();
+    iterator it2_next = it2;
+    ++it2_next;
+    EXPECT_DEATH( C2.erase(it1, it1_next) ); // begin from wrong container
+    EXPECT_DEATH( C2.erase(it1, it2_next) ); // end   from wrong container
+    EXPECT_DEATH( C2.erase(it2, it1_next) ); // both  from wrong container
+    C2.erase(it2, it2_next);
+  }
+
+  // Allocator aware tests
+  static void SwapInvalidatesIterators() {
+    CHECKPOINT("testing swap invalidates iterators");
+    Container C1 = makeContainer(3);
+    Container C2 = makeContainer(3);
+    iterator it1 = C1.begin();
+    iterator it2 = C2.begin();
+    swap(C1, C2);
+    EXPECT_DEATH( C1.erase(it1) );
+    if (CT == CT_String) {
+      EXPECT_DEATH(C1.erase(it2));
+    } else
+      C1.erase(it2);
+    //C2.erase(it1);
+    EXPECT_DEATH( C1.erase(it1) );
+  }
+
+  static void SwapNonEqualAllocators() {
+    CHECKPOINT("testing swap with non-equal allocators");
+    Container C1 = makeContainer(3, allocator_type(1));
+    Container C2 = makeContainer(1, allocator_type(2));
+    Container C3 = makeContainer(2, allocator_type(2));
+    swap(C2, C3);
+    EXPECT_DEATH( swap(C1, C2) );
+  }
+
+ private:
+  BasicContainerChecks() = delete;
+};
+
+} // namespace IteratorDebugChecks
+
+#endif // TEST_SUPPORT_CONTAINER_DEBUG_TESTS_H

test/support/debug_mode_helper.h

 //===----------------------------------------------------------------------===//
 //
 // 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 TEST_SUPPORT_DEBUG_MODE_HELPER_H
 #define TEST_SUPPORT_DEBUG_MODE_HELPER_H
 
 #ifndef _LIBCPP_DEBUG
 #error _LIBCPP_DEBUG must be defined before including this header
 #endif
-#ifndef _LIBCPP_DEBUG_USE_EXCEPTIONS
-#error _LIBCPP_DEBUG_USE_EXCEPTIONS must be defined before including this header
-#endif
 
 #include <ciso646>
 #ifndef _LIBCPP_VERSION
 #error This header may only be used for libc++ tests"
 #endif
 
 #include <__debug>
 #include <utility>
 #include <cstddef>
 #include <cstdlib>
 #include <cassert>
+#include <string>
+#include <sstream>
+#include <iostream>
 
+#include <unistd.h>
+#include <sys/wait.h>
 #include "test_macros.h"
 #include "assert_checkpoint.h"
 #include "test_allocator.h"
 
-// These test make use of 'if constexpr'.
-#if TEST_STD_VER <= 14
-#error This header may only be used in C++17 and greater
-#endif
-#ifdef TEST_HAS_NO_EXCEPTIONS
-#error These tests require exceptions
-#endif
-
-#ifndef __cpp_if_constexpr
-#error These tests require if constexpr
-#endif
-
-/// Assert that the specified expression throws a libc++ debug exception.
-#define CHECK_DEBUG_THROWS(...) assert((CheckDebugThrows( [&]() { __VA_ARGS__; } )))
-
-template <class Func>
-inline bool CheckDebugThrows(Func&& func) {
-  try {
-    func();
-  } catch (std::__libcpp_debug_exception const&) {
+struct DebugInfoMatcher {
+  static const int any_line = -1;
+  static constexpr const char* any_file = "*";
+  static constexpr const char* any_msg = "*";
+
+  constexpr DebugInfoMatcher() : msg(nullptr), file(any_file), line(any_line) { }
+  constexpr DebugInfoMatcher(const char* msg, const char* file = any_file, int line = any_line)
+    : msg(msg), file(file), line(line) {}
+
+  bool Matches(std::__libcpp_debug_info const& got) const {
+    assert(msg && "empty matcher");
+    bool IsMatch = [&]() {
+      if (line != any_line && line != got.__line_)
+        return false;
+      if (file != std::string(any_file) && std::string(got.__file_).find(file) == std::string::npos)
+        return false;
+      if (msg != std::string(any_msg) && std::string(got.__msg_).find(msg) == std::string::npos)
+        return false;
       return true;
+    }();
+    if (!IsMatch) {
+      std::cout << "Failed to match debug info!\n"
+                << ToString() << "\n"
+                << "VS\n"
+                << got.what() << "\n";
     }
-  return false;
+    return IsMatch;
   }
 
-namespace IteratorDebugChecks {
-
-enum ContainerType {
-  CT_None,
-  CT_String,
-  CT_Vector,
-  CT_VectorBool,
-  CT_List,
-  CT_Deque,
-  CT_ForwardList,
-  CT_Map,
-  CT_Set,
-  CT_MultiMap,
-  CT_MultiSet,
-  CT_UnorderedMap,
-  CT_UnorderedSet,
-  CT_UnorderedMultiMap,
-  CT_UnorderedMultiSet
-};
-
-constexpr bool isSequential(ContainerType CT) {
-  return CT_Vector >= CT && CT_ForwardList <= CT;
+  std::string ToString() const {
+    std::stringstream ss;
+    ss << "msg = \"" << msg << "\"\n"
+       << "line = " << (line == any_line ? "'*'" : std::to_string(line)) << "\n"
+       << "file = " << (file == any_file ? "'*'" : any_file) << "";
+    return ss.str();
   }
 
-constexpr bool isAssociative(ContainerType CT) {
-  return CT_Map >= CT && CT_MultiSet <= CT;
-}
+  bool empty() const { return msg == nullptr; }
 
-constexpr bool isUnordered(ContainerType CT) {
-  return CT_UnorderedMap >= CT && CT_UnorderedMultiSet <= CT;
-}
-
-constexpr bool isSet(ContainerType CT) {
-  return CT == CT_Set
-      || CT == CT_MultiSet
-      || CT == CT_UnorderedSet
-      || CT == CT_UnorderedMultiSet;
-}
+private:
+  const char* msg;
+  const char* file;
+  int line;
+};
 
-constexpr bool isMap(ContainerType CT) {
-  return CT == CT_Map
-      || CT == CT_MultiMap
-      || CT == CT_UnorderedMap
-      || CT == CT_UnorderedMultiMap;
-}
+static constexpr DebugInfoMatcher AnyMatcher(DebugInfoMatcher::any_msg);
 
-constexpr bool isMulti(ContainerType CT) {
-  return CT == CT_MultiMap
-      || CT == CT_MultiSet
-      || CT == CT_UnorderedMultiMap
-      || CT == CT_UnorderedMultiSet;
+inline DebugInfoMatcher& GlobalMatcher() {
+  static DebugInfoMatcher GMatch;
+  return GMatch;
 }
 
-template <class Container, class ValueType = typename Container::value_type>
-struct ContainerDebugHelper {
-  static_assert(std::is_constructible<ValueType, int>::value,
-                "must be constructible from int");
-
-  static ValueType makeValueType(int val = 0, int = 0) {
-    return ValueType(val);
-  }
+struct DeathTest {
+  enum ResultKind {
+    RK_MatchFound, RK_MatchFailure, RK_DidNotDie, RK_Unknown
   };
 
-template <class Container>
-struct ContainerDebugHelper<Container, char> {
-  static char makeValueType(int = 0, int = 0) {
-    return 'A';
+  TEST_NORETURN static void DeathTestDebugHandler(std::__libcpp_debug_info const& info) {
+    assert(!GlobalMatcher().empty());
+    if (GlobalMatcher().Matches(info)) {
+      std::exit(RK_MatchFound);
     }
-};
-
-template <class Container, class Key, class Value>
-struct ContainerDebugHelper<Container, std::pair<const Key, Value> > {
-  using ValueType = std::pair<const Key, Value>;
-  static_assert(std::is_constructible<Key, int>::value,
-                "must be constructible from int");
-  static_assert(std::is_constructible<Value, int>::value,
-                "must be constructible from int");
-
-  static ValueType makeValueType(int key = 0, int val = 0) {
-    return ValueType(key, val);
+    std::exit(RK_MatchFailure);
   }
-};
 
-template <class Container, ContainerType CT,
-    class Helper = ContainerDebugHelper<Container> >
-struct BasicContainerChecks {
-  using value_type = typename Container::value_type;
-  using iterator = typename Container::iterator;
-  using const_iterator = typename Container::const_iterator;
-  using allocator_type = typename Container::allocator_type;
-  using traits = std::iterator_traits<iterator>;
-  using category = typename traits::iterator_category;
 
-  static_assert(std::is_same<test_allocator<value_type>, allocator_type>::value,
-                "the container must use a test allocator");
+  DeathTest(DebugInfoMatcher const& Matcher) : matcher_(Matcher) {}
 
-  static constexpr bool IsBiDir =
-      std::is_convertible<category, std::bidirectional_iterator_tag>::value;
-
-public:
-  static void run() {
-    run_iterator_tests();
-    run_container_tests();
-    run_allocator_aware_tests();
-  }
+  template <class Func>
+  ResultKind Run(Func&& f) {
+    int pipe_res = pipe(pipe_fd);
+    assert(pipe_res != -1);
 
-  static void run_iterator_tests() {
-    try {
-      TestNullIterators<iterator>();
-      TestNullIterators<const_iterator>();
-      if constexpr (IsBiDir) { DecrementBegin(); }
-      IncrementEnd();
-      DerefEndIterator();
-    } catch (...) {
-      assert(false && "uncaught debug exception");
+    pid_t child_pid = fork();
+    assert(child_pid != -1);
+    child_pid_ = child_pid;
+    if (child_pid_ == 0) {
+      RunForChild(std::forward<Func>(f));
+      assert(false && "unreachable");
     }
+    return RunForParent();
   }
 
-  static void run_container_tests() {
-    try {
-      CopyInvalidatesIterators();
-      MoveInvalidatesIterators();
-      if constexpr (CT != CT_ForwardList) {
-          EraseIter();
-          EraseIterIter();
-      }
-    } catch (...) {
-      assert(false && "uncaught debug exception");
-    }
-  }
+  std::string const& getError() const { return error_msg_; }
 
-  static void run_allocator_aware_tests() {
-    try {
-      SwapNonEqualAllocators();
-      if constexpr (CT != CT_ForwardList ) {
-          // FIXME: This should work for both forward_list and string
-          SwapInvalidatesIterators();
-      }
-    } catch (...) {
-      assert(false && "uncaught debug exception");
+private:
+  template <class Func>
+  TEST_NORETURN void RunForChild(Func&& f) {
+    close(pipe_fd[0]);
+    while ((dup2(pipe_fd[1], STDOUT_FILENO) == -1) && (errno == EINTR)) {}
+    GlobalMatcher() = matcher_;
+    std::__libcpp_set_debug_function(&DeathTestDebugHandler);
+    f();
+    std::exit(RK_DidNotDie);
+  }
+
+  void CaptureIO() {
+    close(pipe_fd[1]);
+    int read_fd = pipe_fd[0];
+    char buffer[256];
+    int num_read;
+    do {
+      while ((num_read = read(read_fd, buffer, 255)) > 0) {
+        buffer[num_read] = '\0';
+        error_msg_ += buffer;
+      }
+    } while (num_read == -1 && errno == EINTR);
+    close(read_fd);
+  }
+
+  ResultKind RunForParent() {
+    CaptureIO();
+
+    int status_value;
+    pid_t result = waitpid(child_pid_, &status_value, 0);
+    assert(result != 1);
+    status_ = status_value;
+
+    if (WIFEXITED(status_value)) {
+      int exit_status = WEXITSTATUS(status_value);
+      assert(exit_status == RK_MatchFound || exit_status == RK_MatchFailure ||
+            exit_status == RK_DidNotDie);
+      return static_cast<ResultKind>(exit_status);
     }
+    return RK_Unknown;
   }
 
-  static Container makeContainer(int size, allocator_type A = allocator_type()) {
-    Container C(A);
-    if constexpr (CT == CT_ForwardList) {
-      for (int i = 0; i < size; ++i)
-        C.insert_after(C.before_begin(), Helper::makeValueType(i));
-    } else {
-      for (int i = 0; i < size; ++i)
-        C.insert(C.end(), Helper::makeValueType(i));
-      assert(C.size() == static_cast<std::size_t>(size));
-    }
-    return C;
-  }
+  DeathTest(DeathTest const&) = delete;
+  DeathTest& operator=(DeathTest const&) = delete;
 
-  static value_type makeValueType(int value) {
-    return Helper::makeValueType(value);
-  }
+private:
+  DebugInfoMatcher matcher_;
+  pid_t child_pid_ = -1;
+  int status_ = -1;
+  int pipe_fd[2];
+  std::string error_msg_;
+};
+
+template <class Func>
+inline bool ExpectDeath(const char* stmt, Func&& func, DebugInfoMatcher Matcher) {
+  DeathTest DT(Matcher);
+  DeathTest::ResultKind RK = DT.Run(func);
+  auto OnFailure = [&](const char* msg) {
+    std::cerr << "EXPECT_DEATH( " << stmt << " ) failed! (" << msg << ")\n\n";
+    if (!DT.getError().empty())
+      std::cerr << DT.getError() << "\n";
+    return false;
+  };
+  switch (RK) {
+  case DeathTest::RK_MatchFound:
+    return true;
+  case DeathTest::RK_Unknown:
+      return OnFailure("reason unknown");
+  case DeathTest::RK_DidNotDie:
+      return OnFailure("child did not die");
+  case DeathTest::RK_MatchFailure:
+      return OnFailure("matcher failed");
+  }
 
-private:
-  // Iterator tests
-  template <class Iter>
-  static void TestNullIterators() {
-    CHECKPOINT("testing null iterator");
-    Iter it;
-    CHECK_DEBUG_THROWS( ++it );
-    CHECK_DEBUG_THROWS( it++ );
-    CHECK_DEBUG_THROWS( *it );
-    if constexpr (CT != CT_VectorBool) {
-      CHECK_DEBUG_THROWS( it.operator->() );
-    }
-    if constexpr (IsBiDir) {
-      CHECK_DEBUG_THROWS( --it );
-      CHECK_DEBUG_THROWS( it-- );
-    }
-  }
-
-  static void DecrementBegin() {
-    CHECKPOINT("testing decrement on begin");
-    Container C = makeContainer(1);
-    iterator i = C.end();
-    const_iterator ci = C.cend();
-    --i;
-    --ci;
-    assert(i == C.begin());
-    CHECK_DEBUG_THROWS( --i );
-    CHECK_DEBUG_THROWS( i-- );
-    CHECK_DEBUG_THROWS( --ci );
-    CHECK_DEBUG_THROWS( ci-- );
-  }
-
-  static void IncrementEnd() {
-    CHECKPOINT("testing increment on end");
-    Container C = makeContainer(1);
-    iterator i = C.begin();
-    const_iterator ci = C.begin();
-    ++i;
-    ++ci;
-    assert(i == C.end());
-    CHECK_DEBUG_THROWS( ++i );
-    CHECK_DEBUG_THROWS( i++ );
-    CHECK_DEBUG_THROWS( ++ci );
-    CHECK_DEBUG_THROWS( ci++ );
-  }
-
-  static void DerefEndIterator() {
-    CHECKPOINT("testing deref end iterator");
-    Container C = makeContainer(1);
-    iterator i = C.begin();
-    const_iterator ci = C.cbegin();
-    (void)*i; (void)*ci;
-    if constexpr (CT != CT_VectorBool) {
-      i.operator->();
-      ci.operator->();
-    }
-    ++i; ++ci;
-    assert(i == C.end());
-    CHECK_DEBUG_THROWS( *i );
-    CHECK_DEBUG_THROWS( *ci );
-    if constexpr (CT != CT_VectorBool) {
-      CHECK_DEBUG_THROWS( i.operator->() );
-      CHECK_DEBUG_THROWS( ci.operator->() );
-    }
-  }
-
-  // Container tests
-  static void CopyInvalidatesIterators() {
-    CHECKPOINT("copy invalidates iterators");
-    Container C1 = makeContainer(3);
-    iterator i = C1.begin();
-    Container C2 = C1;
-    if constexpr (CT == CT_ForwardList) {
-      iterator i_next = i;
-      ++i_next;
-      (void)*i_next;
-      CHECK_DEBUG_THROWS( C2.erase_after(i) );
-      C1.erase_after(i);
-      CHECK_DEBUG_THROWS( *i_next );
-    } else {
-      CHECK_DEBUG_THROWS( C2.erase(i) );
-      (void)*i;
-      C1.erase(i);
-      CHECK_DEBUG_THROWS( *i );
-    }
-  }
-
-  static void MoveInvalidatesIterators() {
-    CHECKPOINT("copy move invalidates iterators");
-    Container C1 = makeContainer(3);
-    iterator i = C1.begin();
-    Container C2 = std::move(C1);
-    (void) *i;
-    if constexpr (CT == CT_ForwardList) {
-      CHECK_DEBUG_THROWS( C1.erase_after(i) );
-      C2.erase_after(i);
-    } else {
-      CHECK_DEBUG_THROWS( C1.erase(i) );
-      C2.erase(i);
-      CHECK_DEBUG_THROWS(*i);
-    }
-  }
-
-  static void EraseIter() {
-    CHECKPOINT("testing erase invalidation");
-    Container C1 = makeContainer(2);
-    iterator it1 = C1.begin();
-    iterator it1_next = it1;
-    ++it1_next;
-    Container C2 = C1;
-    CHECK_DEBUG_THROWS( C2.erase(it1) ); // wrong container
-    CHECK_DEBUG_THROWS( C2.erase(C2.end()) ); // erase with end
-    C1.erase(it1_next);
-    CHECK_DEBUG_THROWS( C1.erase(it1_next) ); // invalidated iterator
-    C1.erase(it1);
-    CHECK_DEBUG_THROWS( C1.erase(it1) ); // invalidated iterator
-  }
-
-  static void EraseIterIter() {
-    CHECKPOINT("testing erase iter iter invalidation");
-    Container C1 = makeContainer(2);
-    iterator it1 = C1.begin();
-    iterator it1_next = it1;
-    ++it1_next;
-    Container C2 = C1;
-    iterator it2 = C2.begin();
-    iterator it2_next = it2;
-    ++it2_next;
-    CHECK_DEBUG_THROWS( C2.erase(it1, it1_next) ); // begin from wrong container
-    CHECK_DEBUG_THROWS( C2.erase(it1, it2_next) ); // end   from wrong container
-    CHECK_DEBUG_THROWS( C2.erase(it2, it1_next) ); // both  from wrong container
-    C2.erase(it2, it2_next);
-  }
-
-  // Allocator aware tests
-  static void SwapInvalidatesIterators() {
-    CHECKPOINT("testing swap invalidates iterators");
-    Container C1 = makeContainer(3);
-    Container C2 = makeContainer(3);
-    iterator it1 = C1.begin();
-    iterator it2 = C2.begin();
-    swap(C1, C2);
-    CHECK_DEBUG_THROWS( C1.erase(it1) );
-    if (CT == CT_String) {
-      CHECK_DEBUG_THROWS(C1.erase(it2));
-    } else
-      C1.erase(it2);
-    //C2.erase(it1);
-    CHECK_DEBUG_THROWS( C1.erase(it1) );
-  }
-
-  static void SwapNonEqualAllocators() {
-    CHECKPOINT("testing swap with non-equal allocators");
-    Container C1 = makeContainer(3, allocator_type(1));
-    Container C2 = makeContainer(1, allocator_type(2));
-    Container C3 = makeContainer(2, allocator_type(2));
-    swap(C2, C3);
-    CHECK_DEBUG_THROWS( swap(C1, C2) );
-  }
+template <class Func>
+inline bool ExpectDeath(const char* stmt, Func&& func) {
+  return ExpectDeath(stmt, func, AnyMatcher);
 
-private:
-  BasicContainerChecks() = delete;
-};
+/// Assert that the specified expression throws a libc++ debug exception.
+#define EXPECT_DEATH(...) assert((ExpectDeath(#__VA_ARGS__, [&]() { __VA_ARGS__; } )))
 
-} // namespace IteratorDebugChecks
+#define EXPECT_DEATH_MATCHES(Matcher, ...) assert((ExpectDeath(#__VA_ARGS__, [&]() { __VA_ARGS__; }, Matcher)))
 
 #endif // TEST_SUPPORT_DEBUG_MODE_HELPER_H