Fix to_ulong to throw overflow_error as expected

Author: winner245

libcxx/include/bitset

@@ -220,10 +220,10 @@ protected:
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 void flip() _NOEXCEPT;
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long to_ulong() const {
-    return to_ulong(_BoolConstant < _Size< sizeof(unsigned long) * CHAR_BIT>());
+    return __to_ulong(_BoolConstant < _Size< sizeof(unsigned long) * CHAR_BIT>());
   }
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long to_ullong() const {
-    return to_ullong(_BoolConstant < _Size< sizeof(unsigned long long) * CHAR_BIT>());
+    return __to_ullong(_BoolConstant < _Size< sizeof(unsigned long long) * CHAR_BIT>());
   }
 
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 bool all() const _NOEXCEPT;
@@ -235,14 +235,14 @@ private:
   void __init(unsigned long long __v, false_type) _NOEXCEPT;
   _LIBCPP_HIDE_FROM_ABI void __init(unsigned long long __v, true_type) _NOEXCEPT;
 #  endif // _LIBCPP_CXX03_LANG
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long to_ulong(false_type) const;
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long to_ulong(true_type) const;
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long to_ulong(true_type, false_type) const;
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long to_ulong(true_type, true_type) const;
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long to_ullong(false_type) const;
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long to_ullong(true_type) const;
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long to_ullong(true_type, false_type) const;
-  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long to_ullong(true_type, true_type) const;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long __to_ulong(false_type) const;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long __to_ulong(true_type) const;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long __to_ulong(true_type, false_type) const;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long __to_ulong(true_type, true_type) const;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long __to_ullong(false_type) const;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long __to_ullong(true_type) const;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long __to_ullong(true_type, false_type) const;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long __to_ullong(true_type, true_type) const;
 };
 
 template <size_t _N_words, size_t _Size>
@@ -351,28 +351,28 @@ _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 void __bitset<_N_words, _Siz
 
 template <size_t _N_words, size_t _Size>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long
-__bitset<_N_words, _Size>::to_ulong(false_type) const {
+__bitset<_N_words, _Size>::__to_ulong(false_type) const {
   if (auto __e = __make_iter(_Size); std::find(__make_iter(sizeof(unsigned long) * CHAR_BIT), __e, true) != __e)
-    std::__throw_overflow_error("bitset to_ulong overflow error");
+    std::__throw_overflow_error("bitset __to_ulong overflow error");
 
-  return to_ulong(true_type());
+  return __to_ulong(true_type());
 }
 
 template <size_t _N_words, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long
-__bitset<_N_words, _Size>::to_ulong(true_type) const {
-  return to_ulong(true_type(), _BoolConstant<sizeof(__storage_type) < sizeof(unsigned long)>());
+__bitset<_N_words, _Size>::__to_ulong(true_type) const {
+  return __to_ulong(true_type(), _BoolConstant<sizeof(__storage_type) < sizeof(unsigned long)>());
 }
 
 template <size_t _N_words, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long
-__bitset<_N_words, _Size>::to_ulong(true_type, false_type) const {
+__bitset<_N_words, _Size>::__to_ulong(true_type, false_type) const {
   return static_cast<unsigned long>(__first_[0]);
 }
 
 template <size_t _N_words, size_t _Size>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long
-__bitset<_N_words, _Size>::to_ulong(true_type, true_type) const {
+__bitset<_N_words, _Size>::__to_ulong(true_type, true_type) const {
   unsigned long __r = static_cast<unsigned long>(__first_[0]);
   _LIBCPP_DIAGNOSTIC_PUSH
   _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wshift-count-overflow")
@@ -381,34 +381,37 @@ __bitset<_N_words, _Size>::to_ulong(true_type, true_type) const {
   _LIBCPP_DIAGNOSTIC_POP
   return __r;
 }
+
 template <size_t _N_words, size_t _Size>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long
-__bitset<_N_words, _Size>::to_ullong(false_type) const {
+__bitset<_N_words, _Size>::__to_ullong(false_type) const {
   if (auto __e = __make_iter(_Size); std::find(__make_iter(sizeof(unsigned long long) * CHAR_BIT), __e, true) != __e)
-    std::__throw_overflow_error("bitset to_ullong overflow error");
+    std::__throw_overflow_error("bitset __to_ullong overflow error");
 
-  return to_ullong(true_type());
+  return __to_ullong(true_type());
 }
 
 template <size_t _N_words, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long
-__bitset<_N_words, _Size>::to_ullong(true_type) const {
-  return to_ullong(true_type(), _BoolConstant<sizeof(__storage_type) < sizeof(unsigned long long)>());
+__bitset<_N_words, _Size>::__to_ullong(true_type) const {
+  return __to_ullong(true_type(), _BoolConstant<sizeof(__storage_type) < sizeof(unsigned long long)>());
 }
 
 template <size_t _N_words, size_t _Size>
 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long
-__bitset<_N_words, _Size>::to_ullong(true_type, false_type) const {
+__bitset<_N_words, _Size>::__to_ullong(true_type, false_type) const {
   return static_cast<unsigned long long>(__first_[0]);
 }
 
 template <size_t _N_words, size_t _Size>
 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long long
-__bitset<_N_words, _Size>::to_ullong(true_type, true_type) const {
+__bitset<_N_words, _Size>::__to_ullong(true_type, true_type) const {
   unsigned long long __r = static_cast<unsigned long long>(__first_[0]);
   _LIBCPP_DIAGNOSTIC_PUSH
   _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wshift-count-overflow")
-  for (size_t __i = 1; __i < _N_words; ++__i)
+  const size_t __ull_wrods = (sizeof(unsigned long long) - 1) / sizeof(__storage_type) + 1;
+  const size_t __n_words   = _N_words < __ull_wrods ? _N_words : __ull_wrods;
+  for (size_t __i = 1; __i < __n_words; ++__i)
     __r |= static_cast<unsigned long long>(__first_[__i]) << (__bits_per_word * __i);
   _LIBCPP_DIAGNOSTIC_POP
   return __r;
@@ -509,6 +512,10 @@ protected:
   _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 bool any() const _NOEXCEPT;
 
   _LIBCPP_HIDE_FROM_ABI size_t __hash_code() const _NOEXCEPT;
+
+private:
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long __to_ulong(false_type) const;
+  _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long __to_ulong(true_type) const;
 };
 
 template <size_t _Size>
@@ -543,6 +550,19 @@ inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 void __bitset<1, _Siz
 
 template <size_t _Size>
 inline _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long __bitset<1, _Size>::to_ulong() const {
+  return __to_ulong(_BoolConstant < _Size< sizeof(unsigned long) * CHAR_BIT>());
+}
+
+template <size_t _Size>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long __bitset<1, _Size>::__to_ulong(false_type) const {
+  if (auto __e = __make_iter(_Size); std::find(__make_iter(sizeof(unsigned long) * CHAR_BIT), __e, true) != __e)
+    __throw_overflow_error("__bitset<1, _Size>::__to_ulong overflow error");
+
+  return static_cast<unsigned long>(__first_);
+}
+
+template <size_t _Size>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX23 unsigned long __bitset<1, _Size>::__to_ulong(true_type) const {
   return static_cast<unsigned long>(__first_);
 }