mirror of
https://github.com/ETLCPP/etl.git
synced 2026-10-28 18:07:10 +08:00
fa238db580
Besides, remove unused ASAN_OPTIONS from github workflows. Further, activate sanitizers for C++23 workflows, at the places where we also activated -O3 optimization. Not activating everywhere for CI efficiency reasons for now. Note that the sanitizers are activated on clang C++23 workflows only, since there is a remaining issue with GCC in delegate_cpp11.
104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
///\file
|
|
|
|
/******************************************************************************
|
|
The MIT License(MIT)
|
|
|
|
Embedded Template Library.
|
|
https://github.com/ETLCPP/etl
|
|
https://www.etlcpp.com
|
|
|
|
Copyright(c) 2014 John Wellbelove
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files(the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions :
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
******************************************************************************/
|
|
|
|
#ifndef ETL_NULLPTR_INCLUDED
|
|
#define ETL_NULLPTR_INCLUDED
|
|
|
|
#include "platform.h"
|
|
|
|
#include <stddef.h>
|
|
|
|
namespace etl
|
|
{
|
|
#if ETL_CPP11_NOT_SUPPORTED
|
|
class nullptr_t
|
|
{
|
|
public:
|
|
|
|
template <class T>
|
|
inline operator T*() const
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
template <class C, class T>
|
|
inline operator T C::*() const
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
inline bool operator==(nullptr_t) const
|
|
{
|
|
return true;
|
|
}
|
|
inline bool operator!=(nullptr_t) const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
private:
|
|
|
|
void operator&() const ETL_DELETE; // cannot take the address of ETL_NULLPTR
|
|
};
|
|
|
|
static const nullptr_t _nullptr = nullptr_t();
|
|
|
|
#define ETL_NULLPTR (etl::_nullptr)
|
|
#else
|
|
// Use the new style nullptr.
|
|
typedef decltype(nullptr) nullptr_t;
|
|
#define ETL_NULLPTR nullptr
|
|
#endif
|
|
} // namespace etl
|
|
|
|
//*****************************************************************************
|
|
/// True when the compiler can fold the comparison at compile time and it yields
|
|
/// null.
|
|
///
|
|
/// Normally the comparison folds for any pointer that is a constant expression,
|
|
/// so this is equivalent to a plain null check. Under GCC's undefined behaviour
|
|
/// sanitizer, however, the comparison is instrumented and only folds for a null
|
|
/// pointer constant, not for the address of an object or function.
|
|
/// __builtin_constant_p filters out the latter, which would otherwise make the
|
|
/// enclosing expression non-constant and reject perfectly valid code.
|
|
///
|
|
/// Only meaningful during constant evaluation. At run time
|
|
/// __builtin_constant_p is false for any pointer that is not a compile time
|
|
/// constant, so this reports false for a genuine null pointer. Callers must
|
|
/// use a plain comparison against ETL_NULLPTR on the run time path.
|
|
//*****************************************************************************
|
|
#if ETL_USING_BUILTIN_CONSTANT_P
|
|
#define ETL_IS_FOLDED_NULL(p) (__builtin_constant_p((p) == ETL_NULLPTR) && ((p) == ETL_NULLPTR))
|
|
#else
|
|
#define ETL_IS_FOLDED_NULL(p) ((p) == ETL_NULLPTR)
|
|
#endif
|
|
|
|
#endif
|