b66e5a95c0
Ensure that nothrow versions of new and delete call the ordinary versions of new or delete, instead of calling malloc or free directly. These files are all compiled with -std=gnu++14 so can use noexcept and nullptr to make the code more readable. PR libstdc++/68210 * doc/xml/manual/intro.xml: Document LWG 206 change. * libsupc++/del_op.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept. * libsupc++/del_opa.cc: Likewise. * libsupc++/del_opant.cc: Likewise. * libsupc++/del_opnt.cc: Likewise. Call operator delete(ptr) instead of free(ptr). * libsupc++/del_ops.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept. * libsupc++/del_opsa.cc: Likewise. * libsupc++/del_opva.cc: Likewise. * libsupc++/del_opvant.cc: Likewise. * libsupc++/del_opvnt.cc: Likewise. Call operator delete[](ptr) instead of operator delete(ptr). * libsupc++/del_opvs.cc: Replace _GLIBCXX_USE_NOEXCEPT with noexcept. * libsupc++/del_opvsa.cc: Likewise. * libsupc++/new_op.cc: Use __builtin_expect in check for zero size. * libsupc++/new_opa.cc: Use nullptr instead of literal 0. * libsupc++/new_opant.cc: Likewise. Replace _GLIBCXX_USE_NOEXCEPT with noexcept. * libsupc++/new_opnt.cc: Likewise. Call operator new(sz) instead of malloc(sz). * libsupc++/new_opvant.cc: Use nullptr and noexcept. * libsupc++/new_opvnt.cc: Likewise. Call operator new[](sz) instead of operator new(sz, nothrow). * testsuite/18_support/new_nothrow.cc: New test. From-SVN: r263478
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
// Boilerplate support routines for -*- C++ -*- dynamic memory management.
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// Copyright (C) 1997-2018 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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//
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include <bits/c++config.h>
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#if !_GLIBCXX_HOSTED
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// A freestanding C runtime may not provide "free" -- but there is no
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// other reasonable way to implement "operator delete".
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namespace std
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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extern "C" void free(void*);
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#else
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# include <cstdlib>
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#endif
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#include "new"
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// The sized deletes are defined in other files.
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#pragma GCC diagnostic ignored "-Wsized-deallocation"
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_GLIBCXX_WEAK_DEFINITION void
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operator delete(void* ptr, std::align_val_t) noexcept
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{
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#if _GLIBCXX_HAVE_ALIGNED_ALLOC || _GLIBCXX_HAVE_POSIX_MEMALIGN \
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|| _GLIBCXX_HAVE_MEMALIGN
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std::free (ptr);
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#elif _GLIBCXX_HAVE__ALIGNED_MALLOC
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_aligned_free (ptr);
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#else
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if (ptr)
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std::free (((void **) ptr)[-1]); // See aligned_alloc in new_opa.cc
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#endif
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}
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