mirror of git://gcc.gnu.org/git/gcc.git
113 lines
3.3 KiB
C++
113 lines
3.3 KiB
C++
// Support routines for the -*- C++ -*- dynamic memory management.
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// Copyright (C) 1997-2017 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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#include <stdlib.h>
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#include <bits/exception_defines.h>
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#include "new"
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using std::new_handler;
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using std::bad_alloc;
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#if !_GLIBCXX_HAVE_ALIGNED_ALLOC
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#if _GLIBCXX_HAVE__ALIGNED_MALLOC
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#define aligned_alloc(al,sz) _aligned_malloc(sz,al)
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#elif _GLIBCXX_HAVE_POSIX_MEMALIGN
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static inline void*
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aligned_alloc (std::size_t al, std::size_t sz)
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{
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void *ptr;
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// The value of alignment shall be a power of two multiple of sizeof(void *).
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if (al < sizeof(void*))
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al = sizeof(void*);
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int ret = posix_memalign (&ptr, al, sz);
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if (ret == 0)
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return ptr;
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return nullptr;
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}
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#elif _GLIBCXX_HAVE_MEMALIGN
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#if _GLIBCXX_HOSTED
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#include <malloc.h>
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#else
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extern "C" void *memalign(std::size_t boundary, std::size_t size);
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#endif
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#define aligned_alloc memalign
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#else
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#include <stdint.h>
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// The C library doesn't provide any aligned allocation functions, define one.
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// This is a modified version of code from gcc/config/i386/gmm_malloc.h
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static inline void*
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aligned_alloc (std::size_t al, std::size_t sz)
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{
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// Alignment must be a power of two.
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if (al & (al - 1))
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return nullptr;
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else if (!sz)
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return nullptr;
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// We need extra bytes to store the original value returned by malloc.
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if (al < sizeof(void*))
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al = sizeof(void*);
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void* const malloc_ptr = malloc(sz + al);
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if (!malloc_ptr)
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return nullptr;
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// Align to the requested value, leaving room for the original malloc value.
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void* const aligned_ptr = (void *) (((uintptr_t) malloc_ptr + al) & -al);
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// Store the original malloc value where it can be found by operator delete.
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((void **) aligned_ptr)[-1] = malloc_ptr;
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return aligned_ptr;
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}
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#endif
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#endif
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_GLIBCXX_WEAK_DEFINITION void *
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operator new (std::size_t sz, std::align_val_t al)
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{
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void *p;
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std::size_t align = (std::size_t)al;
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/* malloc (0) is unpredictable; avoid it. */
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if (sz == 0)
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sz = 1;
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#if _GLIBCXX_HAVE_ALIGNED_ALLOC
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/* C11: the value of size shall be an integral multiple of alignment. */
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if (std::size_t rem = sz & (align - 1))
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sz += align - rem;
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#endif
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while (__builtin_expect ((p = aligned_alloc (align, sz)) == 0, false))
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{
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new_handler handler = std::get_new_handler ();
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if (! handler)
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_GLIBCXX_THROW_OR_ABORT(bad_alloc());
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handler ();
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}
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return p;
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}
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