| // Support routines for the -*- C++ -*- dynamic memory management. |
| |
| // Copyright (C) 1997-2018 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/>. |
| |
| #include <bits/c++config.h> |
| #include <stdlib.h> |
| #include <bits/exception_defines.h> |
| #include "new" |
| |
| using std::new_handler; |
| using std::bad_alloc; |
| |
| #if !_GLIBCXX_HAVE_ALIGNED_ALLOC |
| #if _GLIBCXX_HAVE__ALIGNED_MALLOC |
| #define aligned_alloc(al,sz) _aligned_malloc(sz,al) |
| #elif _GLIBCXX_HAVE_POSIX_MEMALIGN |
| static inline void* |
| aligned_alloc (std::size_t al, std::size_t sz) |
| { |
| void *ptr; |
| // The value of alignment shall be a power of two multiple of sizeof(void *). |
| if (al < sizeof(void*)) |
| al = sizeof(void*); |
| int ret = posix_memalign (&ptr, al, sz); |
| if (ret == 0) |
| return ptr; |
| return nullptr; |
| } |
| #elif _GLIBCXX_HAVE_MEMALIGN |
| #if _GLIBCXX_HOSTED |
| #include <malloc.h> |
| #else |
| extern "C" void *memalign(std::size_t boundary, std::size_t size); |
| #endif |
| #define aligned_alloc memalign |
| #else |
| #include <stdint.h> |
| // The C library doesn't provide any aligned allocation functions, define one. |
| // This is a modified version of code from gcc/config/i386/gmm_malloc.h |
| static inline void* |
| aligned_alloc (std::size_t al, std::size_t sz) |
| { |
| // Alignment must be a power of two. |
| if (al & (al - 1)) |
| return nullptr; |
| else if (!sz) |
| return nullptr; |
| |
| // We need extra bytes to store the original value returned by malloc. |
| if (al < sizeof(void*)) |
| al = sizeof(void*); |
| void* const malloc_ptr = malloc(sz + al); |
| if (!malloc_ptr) |
| return nullptr; |
| // Align to the requested value, leaving room for the original malloc value. |
| void* const aligned_ptr = (void *) (((uintptr_t) malloc_ptr + al) & -al); |
| |
| // Store the original malloc value where it can be found by operator delete. |
| ((void **) aligned_ptr)[-1] = malloc_ptr; |
| |
| return aligned_ptr; |
| } |
| #endif |
| #endif |
| |
| _GLIBCXX_WEAK_DEFINITION void * |
| operator new (std::size_t sz, std::align_val_t al) |
| { |
| void *p; |
| std::size_t align = (std::size_t)al; |
| |
| /* malloc (0) is unpredictable; avoid it. */ |
| if (sz == 0) |
| sz = 1; |
| |
| #if _GLIBCXX_HAVE_ALIGNED_ALLOC |
| /* C11: the value of size shall be an integral multiple of alignment. */ |
| if (std::size_t rem = sz & (align - 1)) |
| sz += align - rem; |
| #endif |
| |
| while (__builtin_expect ((p = aligned_alloc (align, sz)) == 0, false)) |
| { |
| new_handler handler = std::get_new_handler (); |
| if (! handler) |
| _GLIBCXX_THROW_OR_ABORT(bad_alloc()); |
| handler (); |
| } |
| |
| return p; |
| } |