| /**************************************************************************** |
| ** |
| ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). |
| ** All rights reserved. |
| ** Contact: Nokia Corporation (qt-info@nokia.com) |
| ** |
| ** This file is part of the QtCore module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** GNU Lesser General Public License Usage |
| ** This file may be used under the terms of the GNU Lesser General Public |
| ** License version 2.1 as published by the Free Software Foundation and |
| ** appearing in the file LICENSE.LGPL included in the packaging of this |
| ** file. Please review the following information to ensure the GNU Lesser |
| ** General Public License version 2.1 requirements will be met: |
| ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
| ** |
| ** In addition, as a special exception, Nokia gives you certain additional |
| ** rights. These rights are described in the Nokia Qt LGPL Exception |
| ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU General |
| ** Public License version 3.0 as published by the Free Software Foundation |
| ** and appearing in the file LICENSE.GPL included in the packaging of this |
| ** file. Please review the following information to ensure the GNU General |
| ** Public License version 3.0 requirements will be met: |
| ** http://www.gnu.org/copyleft/gpl.html. |
| ** |
| ** Other Usage |
| ** Alternatively, this file may be used in accordance with the terms and |
| ** conditions contained in a signed written agreement between you and Nokia. |
| ** |
| ** |
| ** |
| ** |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "qplatformdefs.h" |
| |
| #include <stdlib.h> |
| |
| /* |
| Define the container allocation functions in a separate file, so that our |
| users can easily override them. |
| */ |
| |
| QT_BEGIN_NAMESPACE |
| |
| void *qMalloc(size_t size) |
| { |
| return ::malloc(size); |
| } |
| |
| void qFree(void *ptr) |
| { |
| ::free(ptr); |
| } |
| |
| void *qRealloc(void *ptr, size_t size) |
| { |
| return ::realloc(ptr, size); |
| } |
| |
| void *qMallocAligned(size_t size, size_t alignment) |
| { |
| return qReallocAligned(0, size, 0, alignment); |
| } |
| |
| void *qReallocAligned(void *oldptr, size_t newsize, size_t oldsize, size_t alignment) |
| { |
| // fake an aligned allocation |
| Q_UNUSED(oldsize); |
| |
| void *actualptr = oldptr ? static_cast<void **>(oldptr)[-1] : 0; |
| if (alignment <= sizeof(void*)) { |
| // special, fast case |
| void **newptr = static_cast<void **>(qRealloc(actualptr, newsize + sizeof(void*))); |
| if (!newptr) |
| return 0; |
| if (newptr == actualptr) { |
| // realloc succeeded without reallocating |
| return oldptr; |
| } |
| |
| *newptr = newptr; |
| return newptr + 1; |
| } |
| |
| // qMalloc returns pointers aligned at least at sizeof(size_t) boundaries |
| // but usually more (8- or 16-byte boundaries). |
| // So we overallocate by alignment-sizeof(size_t) bytes, so we're guaranteed to find a |
| // somewhere within the first alignment-sizeof(size_t) that is properly aligned. |
| |
| // However, we need to store the actual pointer, so we need to allocate actually size + |
| // alignment anyway. |
| |
| void *real = qRealloc(actualptr, newsize + alignment); |
| if (!real) |
| return 0; |
| |
| quintptr faked = reinterpret_cast<quintptr>(real) + alignment; |
| faked &= ~(alignment - 1); |
| |
| void **faked_ptr = reinterpret_cast<void **>(faked); |
| |
| // now save the value of the real pointer at faked-sizeof(void*) |
| // by construction, alignment > sizeof(void*) and is a power of 2, so |
| // faked-sizeof(void*) is properly aligned for a pointer |
| faked_ptr[-1] = real; |
| |
| return faked_ptr; |
| } |
| |
| void qFreeAligned(void *ptr) |
| { |
| if (!ptr) |
| return; |
| void **ptr2 = static_cast<void **>(ptr); |
| free(ptr2[-1]); |
| } |
| |
| QT_END_NAMESPACE |
| |