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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 | { |
84 | Allocation() |
85 | : size(0) |
86 | , free(true) |
87 | {} |
88 | |
89 | void *memoryStart() const; |
90 | size_t memorySize() const { return size; } |
91 | |
92 | void *exceptionHandlerStart() const; |
93 | size_t exceptionHandlerSize() const; |
94 | |
95 | void *codeStart() const; |
96 | |
97 | void invalidate() { addr = 0; } |
98 | bool isValid() const { return addr != 0; } |
99 | void deallocate(ExecutableAllocator *allocator); |
100 | |
101 | private: |
102 | ~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 |
118 | int freeAllocationCount() const { return freeAllocations.count(); } |
119 | int chunkCount() const { return chunks.count(); } |
120 | |
121 | struct ChunkOfPages |
122 | { |
123 | 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 | |