qmalloc.cpp

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qmalloc.cpp

Absolute File Name:

/home/qt/qt5_coco/qt5/qtbase/src/corelib/global/qmalloc.cpp

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/****************************************************************************

** Contact: https://www.qt.io/licensing/

** This file is part of the QtCore module of the Qt Toolkit.

** $QT_BEGIN_LICENSE:LGPL$

** Commercial License Usage

** Licensees holding valid commercial Qt licenses may use this file in

** accordance with the commercial license agreement provided with the

** Software or, alternatively, in accordance with the terms contained in

** a written agreement between you and The Qt Company. For licensing terms

** and conditions see https://www.qt.io/terms-conditions. For further

** information use the contact form at https://www.qt.io/contact-us.

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 3 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL3 included in the

** packaging of this file. Please review the following information to

** ensure the GNU Lesser General Public License version 3 requirements

** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.

** GNU General Public License Usage

** Alternatively, this file may be used under the terms of the GNU

** General Public License version 2.0 or (at your option) the GNU General

** Public license version 3 or any later version approved by the KDE Free

** Qt Foundation. The licenses are as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3

** included in the packaging of this file. Please review the following

** information to ensure the GNU General Public License requirements will

** be met: https://www.gnu.org/licenses/gpl-2.0.html and

** https://www.gnu.org/licenses/gpl-3.0.html.

** $QT_END_LICENSE$

****************************************************************************/

#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

#if !QT_DEPRECATED_SINCE(5, 0)

// Make sure they're defined to be exported

Q_CORE_EXPORT void *qMalloc(size_t size) Q_ALLOC_SIZE(1);

Q_CORE_EXPORT void qFree(void *ptr);

Q_CORE_EXPORT void *qRealloc(void *ptr, size_t size) Q_ALLOC_SIZE(2);

#endif

void *qMalloc(size_t size)

{

return ::malloc(size);

never executed: return ::malloc(size);

}

void qFree(void *ptr)

{

::free(ptr);

}

never executed: end of block

void *qRealloc(void *ptr, size_t size)

{

return ::realloc(ptr, size);

never executed: return ::realloc(ptr, size);

}

void *qMallocAligned(size_t size, size_t alignment)

{

return qReallocAligned(0, size, 0, alignment);

executed 1462 times by 4 tests: return qReallocAligned(0, size, 0, alignment);

Executed by:

tst_Collections
tst_QContiguousCache
tst_QGuiMetaType
tst_QMetaType

1462

}

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;

oldptr	Description
TRUE	never evaluated
FALSE	evaluated 1462 times by 4 tests Evaluated by: tst_Collections tst_QContiguousCache tst_QGuiMetaType tst_QMetaType

0-1462

if (alignment <= sizeof(void*)) {

alignment <= sizeof(void*)	Description
TRUE	evaluated 261 times by 4 tests Evaluated by: tst_Collections tst_QContiguousCache tst_QGuiMetaType tst_QMetaType
FALSE	evaluated 1201 times by 1 test Evaluated by: tst_Collections

261-1201

// special, fast case

void **newptr = static_cast<void **>(realloc(actualptr, newsize + sizeof(void*)));

if (!newptr)

!newptr	Description
TRUE	never evaluated
FALSE	evaluated 261 times by 4 tests Evaluated by: tst_Collections tst_QContiguousCache tst_QGuiMetaType tst_QMetaType

0-261

return 0;

never executed: return 0;

if (newptr == actualptr) {

newptr == actualptr	Description
TRUE	never evaluated
FALSE	evaluated 261 times by 4 tests Evaluated by: tst_Collections tst_QContiguousCache tst_QGuiMetaType tst_QMetaType

0-261

// realloc succeeded without reallocating

return oldptr;

never executed: return oldptr;

}

*newptr = newptr;

return newptr + 1;

executed 261 times by 4 tests: return newptr + 1;

Executed by:

tst_Collections
tst_QContiguousCache
tst_QGuiMetaType
tst_QMetaType

261

}

// malloc returns pointers aligned at least at sizeof(size_t) boundaries

100

// but usually more (8- or 16-byte boundaries).

101

// So we overallocate by alignment-sizeof(size_t) bytes, so we're guaranteed to find a

102

// somewhere within the first alignment-sizeof(size_t) that is properly aligned.

103

104

// However, we need to store the actual pointer, so we need to allocate actually size +

105

// alignment anyway.

106

107

void *real = realloc(actualptr, newsize + alignment);

108

if (!real)

!real	Description
TRUE	never evaluated
FALSE	evaluated 1201 times by 1 test Evaluated by: tst_Collections

0-1201

109

return 0;

never executed: return 0;

110

111

quintptr faked = reinterpret_cast<quintptr>(real) + alignment;

112

faked &= ~(alignment - 1);

113

114

void **faked_ptr = reinterpret_cast<void **>(faked);

115

116

// now save the value of the real pointer at faked-sizeof(void*)

117

// by construction, alignment > sizeof(void*) and is a power of 2, so

118

// faked-sizeof(void*) is properly aligned for a pointer

119

faked_ptr[-1] = real;

120

121

return faked_ptr;

executed 1201 times by 1 test: return faked_ptr;

Executed by:

tst_Collections

1201

122

}

123

124

void qFreeAligned(void *ptr)

125

{

126

if (!ptr)

!ptr	Description
TRUE	evaluated 2 times by 1 test Evaluated by: tst_QMetaType
FALSE	evaluated 1459 times by 4 tests Evaluated by: tst_Collections tst_QContiguousCache tst_QGuiMetaType tst_QMetaType

2-1459

127

return;

executed 2 times by 1 test: return;

Executed by: