intermediate changes

ref:6047a064234457e5084bb81c38d0758e4de103c3

build/ymake.core.conf

@@ -9,7 +9,7 @@
 FAKEID=3141592653
 
 SANDBOX_FAKEID=${FAKEID}.7600000
-CPP_FAKEID=9137428
+CPP_FAKEID=9140489
 GO_FAKEID=9056219
 ANDROID_FAKEID=8821472
 CLANG_TIDY_FAKEID=8625699

contrib/libs/cxxsupp/libcxx/import

@@ -1,6 +1,6 @@
 #!/bin/sh -e
 
-rev=7f287390
+rev=efbe9ae2
 output_dir="libcxx-r$rev"
 if [ -z $1 ] ; then
     git clone https://github.com/llvm/llvm-project.git --no-checkout "$output_dir/tmp"

contrib/libs/cxxsupp/libcxx/include/__algorithm/comp_ref_type.h

@@ -11,6 +11,11 @@
 
 #include <__config>
 
+#ifdef _LIBCPP_DEBUG
+#  include <__debug>
+#  include <__utility/declval.h>
+#endif
+
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif

contrib/libs/cxxsupp/libcxx/include/__algorithm/nth_element.h

@@ -16,6 +16,10 @@
 #include <__iterator/iterator_traits.h>
 #include <__utility/swap.h>
 
+#if defined(_LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY)
+#  include <__algorithm/shuffle.h>
+#endif
+
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
@@ -222,8 +226,13 @@ inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
 void
 nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth, _RandomAccessIterator __last, _Compare __comp)
 {
-    typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
-    _VSTD::__nth_element<_Comp_ref>(__first, __nth, __last, __comp);
+  _LIBCPP_DEBUG_RANDOMIZE_RANGE(__first, __last);
+  typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
+  _VSTD::__nth_element<_Comp_ref>(__first, __nth, __last, __comp);
+  _LIBCPP_DEBUG_RANDOMIZE_RANGE(__first, __nth);
+  if (__nth != __last) {
+    _LIBCPP_DEBUG_RANDOMIZE_RANGE(++__nth, __last);
+  }
 }
 
 template <class _RandomAccessIterator>

contrib/libs/cxxsupp/libcxx/include/__algorithm/partial_sort.h

@@ -18,6 +18,10 @@
 #include <__iterator/iterator_traits.h>
 #include <__utility/swap.h>
 
+#if defined(_LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY)
+#  include <__algorithm/shuffle.h>
+#endif
+
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
@@ -48,8 +52,10 @@ void
 partial_sort(_RandomAccessIterator __first, _RandomAccessIterator __middle, _RandomAccessIterator __last,
              _Compare __comp)
 {
-    typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
-    _VSTD::__partial_sort<_Comp_ref>(__first, __middle, __last, __comp);
+  _LIBCPP_DEBUG_RANDOMIZE_RANGE(__first, __last);
+  typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
+  _VSTD::__partial_sort<_Comp_ref>(__first, __middle, __last, __comp);
+  _LIBCPP_DEBUG_RANDOMIZE_RANGE(__middle, __last);
 }
 
 template <class _RandomAccessIterator>

contrib/libs/cxxsupp/libcxx/include/__algorithm/shuffle.h

@@ -25,6 +25,40 @@ _LIBCPP_PUSH_MACROS
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
+class _LIBCPP_TYPE_VIS __libcpp_debug_randomizer {
+public:
+  __libcpp_debug_randomizer() {
+    __state = __seed();
+    __inc = __state + 0xda3e39cb94b95bdbULL;
+    __inc = (__inc << 1) | 1;
+  }
+  typedef uint_fast32_t result_type;
+
+  static const result_type _Min = 0;
+  static const result_type _Max = 0xFFFFFFFF;
+
+  _LIBCPP_HIDE_FROM_ABI result_type operator()() {
+    uint_fast64_t __oldstate = __state;
+    __state = __oldstate * 6364136223846793005ULL + __inc;
+    return __oldstate >> 32;
+  }
+
+  static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR result_type min() { return _Min; }
+  static _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR result_type max() { return _Max; }
+
+private:
+  uint_fast64_t __state;
+  uint_fast64_t __inc;
+  _LIBCPP_HIDE_FROM_ABI static uint_fast64_t __seed() {
+#ifdef _LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY_SEED
+    return _LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY_SEED;
+#else
+    static char __x;
+    return reinterpret_cast<uintptr_t>(&__x);
+#endif
+  }
+};
+
 #if _LIBCPP_STD_VER <= 14 || defined(_LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE) \
   || defined(_LIBCPP_BUILDING_LIBRARY)
 class _LIBCPP_TYPE_VIS __rs_default;

contrib/libs/cxxsupp/libcxx/include/__algorithm/sort.h

@@ -18,6 +18,10 @@
 #include <__utility/swap.h>
 #include <memory>
 
+#if defined(_LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY)
+#  include <__algorithm/shuffle.h>
+#endif
+
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
@@ -529,12 +533,13 @@ inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
 void
 sort(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp)
 {
-    typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
-    if (__libcpp_is_constant_evaluated()) {
-        _VSTD::__partial_sort<_Comp_ref>(__first, __last, __last, _Comp_ref(__comp));
-    } else {
-        _VSTD::__sort<_Comp_ref>(_VSTD::__unwrap_iter(__first), _VSTD::__unwrap_iter(__last), _Comp_ref(__comp));
-    }
+  _LIBCPP_DEBUG_RANDOMIZE_RANGE(__first, __last);
+  typedef typename __comp_ref_type<_Compare>::type _Comp_ref;
+  if (__libcpp_is_constant_evaluated()) {
+    _VSTD::__partial_sort<_Comp_ref>(__first, __last, __last, _Comp_ref(__comp));
+  } else {
+    _VSTD::__sort<_Comp_ref>(_VSTD::__unwrap_iter(__first), _VSTD::__unwrap_iter(__last), _Comp_ref(__comp));
+  }
 }
 
 template <class _RandomAccessIterator>

contrib/libs/cxxsupp/libcxx/include/__config

@@ -108,6 +108,11 @@
 // its vtable and typeinfo to libc++ rather than having all other libraries
 // using that class define their own copies.
 #  define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION
+// Override the default return value of exception::what() for
+// bad_function_call::what() with a string that is specific to
+// bad_function_call (see http://wg21.link/LWG2233). This is an ABI break
+// because it changes the vtable layout of bad_function_call.
+#  define _LIBCPP_ABI_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE
 // Enable optimized version of __do_get_(un)signed which avoids redundant copies.
 #  define _LIBCPP_ABI_OPTIMIZED_LOCALE_NUM_GET
 // In C++20 and later, don't derive std::plus from std::binary_function,
@@ -153,6 +158,11 @@
 // reduces the number of weak definitions generated in programs that use
 // iostreams by providing a single strong definition in the shared library.
 # define _LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1
+
+// Define a key function for `bad_function_call` in the library, to centralize
+// its vtable and typeinfo to libc++ rather than having all other libraries
+// using that class define their own copies.
+#  define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION
 #endif
 
 #define _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_X##_LIBCPP_Y
@@ -897,16 +907,35 @@ typedef unsigned int   char32_t;
 // _LIBCPP_DEBUG potential values:
 //  - undefined: No assertions. This is the default.
 //  - 0:         Basic assertions
-//  - 1:         Basic assertions + iterator validity checks.
-#if !defined(_LIBCPP_DEBUG)
-# define _LIBCPP_DEBUG_LEVEL 0
-#elif _LIBCPP_DEBUG == 0
-# define _LIBCPP_DEBUG_LEVEL 1
-#elif _LIBCPP_DEBUG == 1
-# define _LIBCPP_DEBUG_LEVEL 2
-#else
-# error Supported values for _LIBCPP_DEBUG are 0 and 1
-#endif
+//  - 1:         Basic assertions + iterator validity checks + unspecified behavior randomization.
+#  if !defined(_LIBCPP_DEBUG)
+#    define _LIBCPP_DEBUG_LEVEL 0
+#  elif _LIBCPP_DEBUG == 0
+#    define _LIBCPP_DEBUG_LEVEL 1
+#  elif _LIBCPP_DEBUG == 1
+#    define _LIBCPP_DEBUG_LEVEL 2
+#  else
+#    error Supported values for _LIBCPP_DEBUG are 0 and 1
+#  endif
+
+#  if _LIBCPP_DEBUG_LEVEL >= 2 && !defined(_LIBCPP_CXX03_LANG)
+#    define _LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY
+#  endif
+
+#  if defined(_LIBCPP_DEBUG_RANDOMIZE_UNSPECIFIED_STABILITY)
+#    if defined(_LIBCPP_CXX03_LANG)
+#      error Support for unspecified stability is only for C++11 and higher
+#    endif
+#    define _LIBCPP_DEBUG_RANDOMIZE_RANGE(__first, __last)                                                             \
+      do {                                                                                                             \
+        if (!__builtin_is_constant_evaluated())                                                                        \
+          _VSTD::shuffle(__first, __last, __libcpp_debug_randomizer());                                                \
+      } while (false)
+#  else
+#    define _LIBCPP_DEBUG_RANDOMIZE_RANGE(__first, __last)                                                             \
+      do {                                                                                                             \
+      } while (false)
+#  endif
 
 // Libc++ allows disabling extern template instantiation declarations by
 // means of users defining _LIBCPP_DISABLE_EXTERN_TEMPLATE.

contrib/libs/cxxsupp/libcxx/include/__functional/function.h

@@ -35,10 +35,17 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 class _LIBCPP_EXCEPTION_ABI bad_function_call
     : public exception
 {
-#ifdef _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION
 public:
+// Note that when a key function is not used, every translation unit that uses
+// bad_function_call will end up containing a weak definition of the vtable and
+// typeinfo.
+#ifdef _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION
     virtual ~bad_function_call() _NOEXCEPT;
+#else
+    virtual ~bad_function_call() _NOEXCEPT {}
+#endif
 
+#ifdef _LIBCPP_ABI_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE
     virtual const char* what() const _NOEXCEPT;
 #endif
 };

contrib/libs/cxxsupp/libcxx/src/functional.cpp

@@ -14,7 +14,9 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 bad_function_call::~bad_function_call() noexcept
 {
 }
+#endif
 
+#ifdef _LIBCPP_ABI_BAD_FUNCTION_CALL_GOOD_WHAT_MESSAGE
 const char*
 bad_function_call::what() const noexcept
 {