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Re: [PATCH, libstdc++/61166] overflow when parse number in std::duration operator""


Here's a finished patch to simplify <bits/parse_numbers.h>

Tested x86_64-linux. Ed, any objection to this version?

commit 87d26af2fc07f0c45a0a6676161ae1db1d7541b7
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed May 14 16:35:20 2014 +0100

    2014-05-15  Ed Smith-Rowland  <3dw4rd@verizon.net>
    	    Jonathan Wakely  <jwakely@redhat.com>
    
    	PR libstdc++/61166
    	* include/bits/parse_numbers.h: Use integral_constant to remove
    	duplication and simplify.
    	* testsuite/20_util/duration/literals/61166.cc: New.

diff --git a/libstdc++-v3/include/bits/parse_numbers.h b/libstdc++-v3/include/bits/parse_numbers.h
index 91a127c..0a42381a 100644
--- a/libstdc++-v3/include/bits/parse_numbers.h
+++ b/libstdc++-v3/include/bits/parse_numbers.h
@@ -27,8 +27,8 @@
  *  Do not attempt to use it directly. @headername{chrono}
  */
 
-#ifndef _PARSE_NUMBERS_H
-#define _PARSE_NUMBERS_H 1
+#ifndef _GLIBCXX_PARSE_NUMBERS_H
+#define _GLIBCXX_PARSE_NUMBERS_H 1
 
 #pragma GCC system_header
 
@@ -36,289 +36,181 @@
 
 #if __cplusplus > 201103L
 
+#include <limits>
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
-namespace __parse_int {
-
+namespace __parse_int
+{
   template<unsigned _Base, char _Dig>
     struct _Digit;
 
   template<unsigned _Base>
-    struct _Digit<_Base, '0'>
+    struct _Digit<_Base, '0'> : integral_constant<unsigned, 0>
     {
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0};
+      using __valid = true_type;
     };
 
   template<unsigned _Base>
-    struct _Digit<_Base, '1'>
+    struct _Digit<_Base, '1'> : integral_constant<unsigned, 1>
     {
-      static constexpr bool valid{true};
-      static constexpr unsigned value{1};
+      using __valid = true_type;
     };
 
-  template<unsigned _Base>
-    struct _Digit<_Base, '2'>
+  template<unsigned _Base, unsigned _Val>
+    struct _Digit_impl : integral_constant<unsigned, _Val>
     {
-      static_assert(_Base > 2, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{2};
+      static_assert(_Base > _Val, "invalid digit");
+      using __valid = true_type;
     };
 
   template<unsigned _Base>
-    struct _Digit<_Base, '3'>
-    {
-      static_assert(_Base > 3, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{3};
-    };
+    struct _Digit<_Base, '2'> : _Digit_impl<_Base, 2>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, '4'>
-    {
-      static_assert(_Base > 4, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{4};
-    };
+    struct _Digit<_Base, '3'> : _Digit_impl<_Base, 3>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, '5'>
-    {
-      static_assert(_Base > 5, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{5};
-    };
+    struct _Digit<_Base, '4'> : _Digit_impl<_Base, 4>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, '6'>
-    {
-      static_assert(_Base > 6, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{6};
-    };
+    struct _Digit<_Base, '5'> : _Digit_impl<_Base, 5>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, '7'>
-    {
-      static_assert(_Base > 7, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{7};
-    };
+    struct _Digit<_Base, '6'> : _Digit_impl<_Base, 6>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, '8'>
-    {
-      static_assert(_Base > 8, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{8};
-    };
+    struct _Digit<_Base, '7'> : _Digit_impl<_Base, 7>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, '9'>
-    {
-      static_assert(_Base > 9, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{9};
-    };
+    struct _Digit<_Base, '8'> : _Digit_impl<_Base, 8>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'a'>
-    {
-      static_assert(_Base > 0xa, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xa};
-    };
+    struct _Digit<_Base, '9'> : _Digit_impl<_Base, 9>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'A'>
-    {
-      static_assert(_Base > 0xa, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xa};
-    };
+    struct _Digit<_Base, 'a'> : _Digit_impl<_Base, 0xa>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'b'>
-    {
-      static_assert(_Base > 0xb, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xb};
-    };
+    struct _Digit<_Base, 'A'> : _Digit_impl<_Base, 0xa>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'B'>
-    {
-      static_assert(_Base > 0xb, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xb};
-    };
+    struct _Digit<_Base, 'b'> : _Digit_impl<_Base, 0xb>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'c'>
-    {
-      static_assert(_Base > 0xc, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xc};
-    };
+    struct _Digit<_Base, 'B'> : _Digit_impl<_Base, 0xb>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'C'>
-    {
-      static_assert(_Base > 0xc, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xc};
-    };
+    struct _Digit<_Base, 'c'> : _Digit_impl<_Base, 0xc>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'd'>
-    {
-      static_assert(_Base > 0xd, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xd};
-    };
+    struct _Digit<_Base, 'C'> : _Digit_impl<_Base, 0xc>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'D'>
-    {
-      static_assert(_Base > 0xd, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xd};
-    };
+    struct _Digit<_Base, 'd'> : _Digit_impl<_Base, 0xd>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'e'>
-    {
-      static_assert(_Base > 0xe, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xe};
-    };
+    struct _Digit<_Base, 'D'> : _Digit_impl<_Base, 0xd>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'E'>
-    {
-      static_assert(_Base > 0xe, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xe};
-    };
+    struct _Digit<_Base, 'e'> : _Digit_impl<_Base, 0xe>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'f'>
-    {
-      static_assert(_Base > 0xf, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xf};
-    };
+    struct _Digit<_Base, 'E'> : _Digit_impl<_Base, 0xe>
+    { };
 
   template<unsigned _Base>
-    struct _Digit<_Base, 'F'>
-    {
-      static_assert(_Base > 0xf, "invalid digit");
-      static constexpr bool valid{true};
-      static constexpr unsigned value{0xf};
-    };
+    struct _Digit<_Base, 'f'> : _Digit_impl<_Base, 0xf>
+    { };
 
-  //  Digit separator
   template<unsigned _Base>
-    struct _Digit<_Base, '\''>
-    {
-      static constexpr bool valid{false};
-      static constexpr unsigned value{0};
-    };
-
-
-//------------------------------------------------------------------------------
-
-  template<unsigned _Base, char _Dig, char... _Digs>
-    struct _Digits_help
-    {
-      static constexpr unsigned
-	value{_Digit<_Base, _Dig>::valid ?
-	      1U + _Digits_help<_Base, _Digs...>::value :
-	      _Digits_help<_Base, _Digs...>::value};
-    };
-
-  template<unsigned _Base, char _Dig>
-    struct _Digits_help<_Base, _Dig>
-    {
-      static constexpr unsigned value{_Digit<_Base, _Dig>::valid ? 1U : 0U};
-    };
-
-  template<unsigned _Base, char... _Digs>
-    struct _Digits
-    {
-      static constexpr unsigned value{_Digits_help<_Base, _Digs...>::value};
-    };
+    struct _Digit<_Base, 'F'> : _Digit_impl<_Base, 0xf>
+    { };
 
+  //  Digit separator
   template<unsigned _Base>
-    struct _Digits<_Base>
+    struct _Digit<_Base, '\''> : integral_constant<unsigned, 0>
     {
-      static constexpr unsigned value{0U};
+      using __valid = false_type;
     };
 
 //------------------------------------------------------------------------------
 
+  template<unsigned long long _Val>
+    using __ull_constant = integral_constant<unsigned long long, _Val>;
+
   template<unsigned _Base, char _Dig, char... _Digs>
     struct _Power_help
     {
-      static constexpr unsigned
-	value{_Digit<_Base, _Dig>::valid ?
-	      _Base * _Power_help<_Base, _Digs...>::value :
-	      _Power_help<_Base, _Digs...>::value};
+      using __next = typename _Power_help<_Base, _Digs...>::type;
+      using __valid_digit = typename _Digit<_Base, _Dig>::__valid;
+      using type
+	= __ull_constant<__next::value * (__valid_digit{} ? _Base : 1ULL)>;
     };
 
   template<unsigned _Base, char _Dig>
     struct _Power_help<_Base, _Dig>
     {
-      static constexpr unsigned value{_Digit<_Base, _Dig>::valid ? 1U : 0U};
+      using __valid_digit = typename _Digit<_Base, _Dig>::__valid;
+      using type = __ull_constant<__valid_digit::value>;
     };
 
   template<unsigned _Base, char... _Digs>
-    struct _Power
-    {
-      static constexpr unsigned value{_Power_help<_Base, _Digs...>::value};
-    };
+    struct _Power : _Power_help<_Base, _Digs...>::type
+    { };
 
   template<unsigned _Base>
-    struct _Power<_Base>
-    {
-      static constexpr unsigned value{0U};
-    };
+    struct _Power<_Base> : __ull_constant<0>
+    { };
 
 //------------------------------------------------------------------------------
 
-  template<unsigned _Base, unsigned _Pow, char _Dig, char... _Digs>
+  template<unsigned _Base, unsigned long long _Pow, char _Dig, char... _Digs>
     struct _Number_help
     {
-      static constexpr unsigned
-	value{_Digit<_Base, _Dig>::valid ?
-	      _Pow * _Digit<_Base, _Dig>::value
-	      + _Number_help<_Base, _Pow / _Base, _Digs...>::value :
-	      _Number_help<_Base, _Pow, _Digs...>::value};
+      using __digit = _Digit<_Base, _Dig>;
+      using __valid_digit = typename __digit::__valid;
+      using __next = _Number_help<_Base,
+				  _Pow / (_Base * __valid_digit::value),
+				  _Digs...>;
+      using type = __ull_constant<_Pow * __digit::value + __next::type::value>;
     };
 
-  template<unsigned _Base, unsigned _Pow, char _Dig>
+  template<unsigned _Base, unsigned long long _Pow, char _Dig>
     struct _Number_help<_Base, _Pow, _Dig>
     {
       //static_assert(_Pow == 1U, "power should be one");
-      static constexpr unsigned
-	value{_Digit<_Base, _Dig>::valid ? _Digit<_Base, _Dig>::value : 0U};
+      using type = __ull_constant<_Digit<_Base, _Dig>::value>;
     };
 
   template<unsigned _Base, char... _Digs>
     struct _Number
-    {
-      static constexpr unsigned
-	value{_Number_help<_Base, _Power<_Base, _Digs...>::value,
-			   _Digs...>::value};
-    };
+    : _Number_help<_Base, _Power<_Base, _Digs...>::value, _Digs...>::type
+    { };
 
   template<unsigned _Base>
     struct _Number<_Base>
-    {
-      static constexpr unsigned value{0U};
-    };
+    : __ull_constant<0>
+    { };
 
 //------------------------------------------------------------------------------
 //  This _Parse_int is the same 'level' as the old _Base_dispatch.
@@ -328,84 +220,62 @@ namespace __parse_int {
 
   template<char... _Digs>
     struct _Parse_int<'0', 'b', _Digs...>
-    {
-      static constexpr unsigned long long
-	value{_Number<2U, _Digs...>::value};
-    };
+    : _Number<2U, _Digs...>::type
+    { };
 
   template<char... _Digs>
     struct _Parse_int<'0', 'B', _Digs...>
-    {
-      static constexpr unsigned long long
-	value{_Number<2U, _Digs...>::value};
-    };
+    : _Number<2U, _Digs...>::type
+    { };
 
   template<char... _Digs>
     struct _Parse_int<'0', 'x', _Digs...>
-    {
-      static constexpr unsigned long long
-	value{_Number<16U, _Digs...>::value};
-    };
+    : _Number<16U, _Digs...>::type
+    { };
 
   template<char... _Digs>
     struct _Parse_int<'0', 'X', _Digs...>
-    {
-      static constexpr unsigned long long
-	value{_Number<16U, _Digs...>::value};
-    };
+    : _Number<16U, _Digs...>::type
+    { };
 
   template<char... _Digs>
     struct _Parse_int<'0', _Digs...>
-    {
-      static constexpr unsigned long long
-	value{_Number<8U, _Digs...>::value};
-    };
+    : _Number<8U, _Digs...>::type
+    { };
 
   template<char... _Digs>
     struct _Parse_int
-    {
-      static constexpr unsigned long long
-	value{_Number<10U, _Digs...>::value};
-    };
+    : _Number<10U, _Digs...>::type
+    { };
 
 } // namespace __parse_int
 
 
-namespace __select_int {
-
+namespace __select_int
+{
   template<unsigned long long _Val, typename... _Ints>
     struct _Select_int_base;
 
   template<unsigned long long _Val, typename _IntType, typename... _Ints>
     struct _Select_int_base<_Val, _IntType, _Ints...>
-    : integral_constant
-      <
-	typename conditional
-	<
-	  _Val <= static_cast<unsigned long long>
-		    (std::numeric_limits<_IntType>::max()),
-	  _IntType,
-	  typename _Select_int_base<_Val, _Ints...>::value_type
-	>::type,
-	_Val
-      >
+    : conditional_t<(_Val <= std::numeric_limits<_IntType>::max()),
+		    integral_constant<_IntType, _Val>,
+		    _Select_int_base<_Val, _Ints...>>
     { };
 
   template<unsigned long long _Val>
-    struct _Select_int_base<_Val> : integral_constant<unsigned long long, _Val>
+    struct _Select_int_base<_Val>
     { };
 
   template<char... _Digs>
-    struct _Select_int
-    : _Select_int_base<
+    using _Select_int = typename _Select_int_base<
 	__parse_int::_Parse_int<_Digs...>::value,
 	unsigned char,
 	unsigned short,
 	unsigned int,
 	unsigned long,
 	unsigned long long
-      >
-    { };
+      >::type;
 
 } // namespace __select_int
 
@@ -414,4 +284,4 @@ _GLIBCXX_END_NAMESPACE_VERSION
 
 #endif // __cplusplus > 201103L
 
-#endif // _PARSE_NUMBERS_H
+#endif // _GLIBCXX_PARSE_NUMBERS_H
diff --git a/libstdc++-v3/testsuite/20_util/duration/literals/61166.cc b/libstdc++-v3/testsuite/20_util/duration/literals/61166.cc
new file mode 100644
index 0000000..e06adf8
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/duration/literals/61166.cc
@@ -0,0 +1,39 @@
+// { dg-do run }
+// { dg-options "-std=gnu++1y" }
+
+// Copyright (C) 2014 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// libstdc++/61166
+
+#include <chrono>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  using namespace std::literals::chrono_literals;
+
+  // std::numeric_limits<unsigned>::max() == 4294967295
+  VERIFY( (429496729510h).count() == 429496729510 );
+}
+
+int
+main()
+{
+  test01();
+}

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