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Edit File : new \| Size : 7.34 KB
// The -- C++ -- dynamic memory management header. // Copyright (C) 1994-2018 Free Software Foundation, Inc. // This file is part of GCC. // // GCC 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. // // GCC 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. // // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file new * This is a Standard C++ Library header. * * The header @c new defines several functions to manage dynamic memory and * handling memory allocation errors; see * http://gcc.gnu.org/onlinedocs/libstdc++/18_support/howto.html#4 for more. / #ifndef _NEW #define _NEW #pragma GCC system_header #include <bits/c++config.h> #include <exception> #pragma GCC visibility push(default) extern "C++" { namespace std { /* * @brief Exception possibly thrown by @c new. * @ingroup exceptions * * @c bad_alloc (or classes derived from it) is used to report allocation * errors from the throwing forms of @c new. / class bad_alloc : public exception { public: bad_alloc() throw() { } // This declaration is not useless: // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 virtual ~bad_alloc() throw(); // See comment in eh_exception.cc. virtual const char what() const throw(); }; #if __cplusplus >= 201103L class bad_array_new_length : public bad_alloc { public: bad_array_new_length() throw() { } // This declaration is not useless: // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 virtual ~bad_array_new_length() throw(); // See comment in eh_exception.cc. virtual const char* what() const throw(); }; #endif #if __cpp_aligned_new enum class align_val_t: size_t {}; #endif struct nothrow_t { #if __cplusplus >= 201103L explicit nothrow_t() = default; #endif }; extern const nothrow_t nothrow; /** If you write your own error handler to be called by @c new, it must * be of this type. / typedef void (new_handler)(); /// Takes a replacement handler as the argument, returns the /// previous handler. new_handler set_new_handler(new_handler) throw(); #if __cplusplus >= 201103L /// Return the current new handler. new_handler get_new_handler() noexcept; #endif } // namespace std //@{ /** These are replaceable signatures: * - normal single new and delete (no arguments, throw @c bad_alloc on error) * - normal array new and delete (same) * - @c nothrow single new and delete (take a @c nothrow argument, return * @c NULL on error) * - @c nothrow array new and delete (same) * * Placement new and delete signatures (take a memory address argument, * does nothing) may not be replaced by a user's program. / void operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc) __attribute__((__externally_visible__)); void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc) __attribute__((__externally_visible__)); void operator delete(void) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void operator delete[](void) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); #if __cpp_sized_deallocation void operator delete(void, std::size_t) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void operator delete[](void, std::size_t) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); #endif void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void operator delete(void, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void operator delete[](void, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); #if __cpp_aligned_new void* operator new(std::size_t, std::align_val_t) __attribute__((__externally_visible__)); void* operator new(std::size_t, std::align_val_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void operator delete(void, std::align_val_t) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void operator delete(void, std::align_val_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void* operator new[](std::size_t, std::align_val_t) __attribute__((__externally_visible__)); void* operator new[](std::size_t, std::align_val_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void operator delete[](void, std::align_val_t) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void operator delete[](void, std::align_val_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); #if __cpp_sized_deallocation void operator delete(void, std::size_t, std::align_val_t) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); void operator delete[](void, std::size_t, std::align_val_t) _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__)); #endif // __cpp_sized_deallocation #endif // __cpp_aligned_new // Default placement versions of operator new. inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT { return __p; } inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT { return __p; } // Default placement versions of operator delete. inline void operator delete (void, void) _GLIBCXX_USE_NOEXCEPT { } inline void operator delete[](void, void) _GLIBCXX_USE_NOEXCEPT { } //@} } // extern "C++" #if __cplusplus >= 201703L #if __GNUC__ >= 7 # define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1 #elif defined __has_builtin // For non-GNU compilers: # if __has_builtin(__builtin_launder) # define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1 # endif #endif #ifdef _GLIBCXX_HAVE_BUILTIN_LAUNDER namespace std { #define __cpp_lib_launder 201606 /// Pointer optimization barrier [ptr.launder] template<typename _Tp> [[nodiscard]] constexpr _Tp* launder(_Tp* __p) noexcept { return __builtin_launder(__p); } // The program is ill-formed if T is a function type or // (possibly cv-qualified) void. template<typename _Ret, typename... _Args _GLIBCXX_NOEXCEPT_PARM> void launder(_Ret ()(_Args...) _GLIBCXX_NOEXCEPT_QUAL) = delete; template<typename _Ret, typename... _Args _GLIBCXX_NOEXCEPT_PARM> void launder(_Ret ()(_Args......) _GLIBCXX_NOEXCEPT_QUAL) = delete; void launder(void) = delete; void launder(const void) = delete; void launder(volatile void) = delete; void launder(const volatile void) = delete; } #endif // _GLIBCXX_HAVE_BUILTIN_LAUNDER #undef _GLIBCXX_HAVE_BUILTIN_LAUNDER #endif // C++17 #pragma GCC visibility pop #endif Back

Edit File : new | Size : 7.34 KB

// The -*- C++ -*- dynamic memory management header.

// This file is part of GCC.
//
// GCC 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.
// 
// GCC 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.
// 
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file new
 *  This is a Standard C++ Library header.
 *
 *  The header @c new defines several functions to manage dynamic memory and
 *  handling memory allocation errors; see
 *  http://gcc.gnu.org/onlinedocs/libstdc++/18_support/howto.html#4 for more.
 */

#ifndef _NEW
#define _NEW

#pragma GCC system_header

#include <bits/c++config.h>
#include <exception>

#pragma GCC visibility push(default)

extern "C++" {

namespace std 
{
  /**
   *  @brief  Exception possibly thrown by @c new.
   *  @ingroup exceptions
   *
   *  @c bad_alloc (or classes derived from it) is used to report allocation
   *  errors from the throwing forms of @c new.  */
  class bad_alloc : public exception 
  {
  public:
    bad_alloc() throw() { }

// This declaration is not useless:
    // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
    virtual ~bad_alloc() throw();

// See comment in eh_exception.cc.
    virtual const char* what() const throw();
  };

#if __cplusplus >= 201103L
  class bad_array_new_length : public bad_alloc
  {
  public:
    bad_array_new_length() throw() { }

// This declaration is not useless:
    // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
    virtual ~bad_array_new_length() throw();

// See comment in eh_exception.cc.
    virtual const char* what() const throw();
  };
#endif

#if __cpp_aligned_new
  enum class align_val_t: size_t {};
#endif

struct nothrow_t
  {
#if __cplusplus >= 201103L
    explicit nothrow_t() = default;
#endif
  };

extern const nothrow_t nothrow;

/** If you write your own error handler to be called by @c new, it must
   *  be of this type.  */
  typedef void (*new_handler)();

/// Takes a replacement handler as the argument, returns the
  /// previous handler.
  new_handler set_new_handler(new_handler) throw();

#if __cplusplus >= 201103L
  /// Return the current new handler.
  new_handler get_new_handler() noexcept;
#endif
} // namespace std

//@{
/** These are replaceable signatures:
 *  - normal single new and delete (no arguments, throw @c bad_alloc on error)
 *  - normal array new and delete (same)
 *  - @c nothrow single new and delete (take a @c nothrow argument, return
 *    @c NULL on error)
 *  - @c nothrow array new and delete (same)
 *
 *  Placement new and delete signatures (take a memory address argument,
 *  does nothing) may not be replaced by a user's program.
*/
void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc)
  __attribute__((__externally_visible__));
void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc)
  __attribute__((__externally_visible__));
void operator delete(void*) _GLIBCXX_USE_NOEXCEPT
  __attribute__((__externally_visible__));
void operator delete[](void*) _GLIBCXX_USE_NOEXCEPT
  __attribute__((__externally_visible__));
#if __cpp_sized_deallocation
void operator delete(void*, std::size_t) _GLIBCXX_USE_NOEXCEPT
  __attribute__((__externally_visible__));
void operator delete[](void*, std::size_t) _GLIBCXX_USE_NOEXCEPT
  __attribute__((__externally_visible__));
#endif
void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
  __attribute__((__externally_visible__));
void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
  __attribute__((__externally_visible__));
void operator delete(void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
  __attribute__((__externally_visible__));
void operator delete[](void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
  __attribute__((__externally_visible__));
#if __cpp_aligned_new
void* operator new(std::size_t, std::align_val_t)
  __attribute__((__externally_visible__));
void* operator new(std::size_t, std::align_val_t, const std::nothrow_t&)
  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void operator delete(void*, std::align_val_t)
  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void operator delete(void*, std::align_val_t, const std::nothrow_t&)
  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void* operator new[](std::size_t, std::align_val_t)
  __attribute__((__externally_visible__));
void* operator new[](std::size_t, std::align_val_t, const std::nothrow_t&)
  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void operator delete[](void*, std::align_val_t)
  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void operator delete[](void*, std::align_val_t, const std::nothrow_t&)
  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
#if __cpp_sized_deallocation
void operator delete(void*, std::size_t, std::align_val_t)
  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
void operator delete[](void*, std::size_t, std::align_val_t)
  _GLIBCXX_USE_NOEXCEPT __attribute__((__externally_visible__));
#endif // __cpp_sized_deallocation
#endif // __cpp_aligned_new

// Default placement versions of operator new.
inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
{ return __p; }
inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT
{ return __p; }

// Default placement versions of operator delete.
inline void operator delete  (void*, void*) _GLIBCXX_USE_NOEXCEPT { }
inline void operator delete[](void*, void*) _GLIBCXX_USE_NOEXCEPT { }
//@}
} // extern "C++"

#if __cplusplus >= 201703L
#if __GNUC__ >= 7
#  define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1
#elif defined __has_builtin
// For non-GNU compilers:
# if __has_builtin(__builtin_launder)
#  define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1
# endif
#endif

#ifdef _GLIBCXX_HAVE_BUILTIN_LAUNDER
namespace std
{
#define __cpp_lib_launder 201606
  /// Pointer optimization barrier [ptr.launder]
  template<typename _Tp>
    [[nodiscard]] constexpr _Tp*
    launder(_Tp* __p) noexcept
    { return __builtin_launder(__p); }

// The program is ill-formed if T is a function type or
  // (possibly cv-qualified) void.

template<typename _Ret, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
    void launder(_Ret (*)(_Args...) _GLIBCXX_NOEXCEPT_QUAL) = delete;
  template<typename _Ret, typename... _Args _GLIBCXX_NOEXCEPT_PARM>
    void launder(_Ret (*)(_Args......) _GLIBCXX_NOEXCEPT_QUAL) = delete;

void launder(void*) = delete;
  void launder(const void*) = delete;
  void launder(volatile void*) = delete;
  void launder(const volatile void*) = delete;
}
#endif // _GLIBCXX_HAVE_BUILTIN_LAUNDER
#undef _GLIBCXX_HAVE_BUILTIN_LAUNDER
#endif // C++17

#pragma GCC visibility pop

#endif

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