1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtQml module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 3 as published by the Free Software 20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 21 ** packaging of this file. Please review the following information to 22 ** ensure the GNU Lesser General Public License version 3 requirements 23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 24 ** 25 ** GNU General Public License Usage 26 ** Alternatively, this file may be used under the terms of the GNU 27 ** General Public License version 2.0 or (at your option) the GNU General 28 ** Public license version 3 or any later version approved by the KDE Free 29 ** Qt Foundation. The licenses are as published by the Free Software 30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 31 ** included in the packaging of this file. Please review the following 32 ** information to ensure the GNU General Public License requirements will 33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 34 ** https://www.gnu.org/licenses/gpl-3.0.html. 35 ** 36 ** $QT_END_LICENSE$ 37 ** 38 ****************************************************************************/ 39 40 #ifndef QV4EXECUTABLEALLOCATOR_H 41 #define QV4EXECUTABLEALLOCATOR_H 42 43 // 44 // W A R N I N G 45 // ------------- 46 // 47 // This file is not part of the Qt API. It exists purely as an 48 // implementation detail. This header file may change from version to 49 // version without notice, or even be removed. 50 // 51 // We mean it. 52 // 53 54 #include "qv4global_p.h" 55 56 #include <QMultiMap> 57 #include <QHash> 58 #include <QVector> 59 #include <QByteArray> 60 #include <QMutex> 61 62 namespace WTF { 63 class PageAllocation; 64 } 65 66 QT_BEGIN_NAMESPACE 67 68 namespace QV4 { 69 70 class Q_QML_AUTOTEST_EXPORT ExecutableAllocator 71 { 72 public: 73 struct ChunkOfPages; 74 struct Allocation; 75 76 ExecutableAllocator(); 77 ~ExecutableAllocator(); 78 79 Allocation *allocate(size_t size); 80 void free(Allocation *allocation); 81 82 struct Allocation 83 { AllocationAllocation84 Allocation() 85 : size(0) 86 , free(true) 87 {} 88 89 void *memoryStart() const; memorySizeAllocation90 size_t memorySize() const { return size; } 91 92 void *exceptionHandlerStart() const; 93 size_t exceptionHandlerSize() const; 94 95 void *codeStart() const; 96 invalidateAllocation97 void invalidate() { addr = 0; } isValidAllocation98 bool isValid() const { return addr != 0; } 99 void deallocate(ExecutableAllocator *allocator); 100 101 private: ~AllocationAllocation102 ~Allocation() {} 103 104 friend class ExecutableAllocator; 105 106 Allocation *split(size_t dividingSize); 107 bool mergeNext(ExecutableAllocator *allocator); 108 bool mergePrevious(ExecutableAllocator *allocator); 109 110 quintptr addr = 0; 111 uint size : 31; // More than 2GB of function code? nah :) 112 uint free : 1; 113 Allocation *next = nullptr; 114 Allocation *prev = nullptr; 115 }; 116 117 // for debugging / unit-testing freeAllocationCount()118 int freeAllocationCount() const { return freeAllocations.count(); } chunkCount()119 int chunkCount() const { return chunks.count(); } 120 121 struct ChunkOfPages 122 { ChunkOfPagesChunkOfPages123 ChunkOfPages() 124 125 {} 126 ~ChunkOfPages(); 127 128 WTF::PageAllocation *pages = nullptr; 129 Allocation *firstAllocation = nullptr; 130 131 bool contains(Allocation *alloc) const; 132 }; 133 134 ChunkOfPages *chunkForAllocation(Allocation *allocation) const; 135 136 private: 137 QMultiMap<size_t, Allocation*> freeAllocations; 138 QMap<quintptr, ChunkOfPages*> chunks; 139 mutable QRecursiveMutex mutex; 140 }; 141 142 } 143 144 QT_END_NAMESPACE 145 146 #endif // QV4EXECUTABLEALLOCATOR_H 147