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39 | #ifndef QV4ENGINEBASE_P_H |
40 | #define QV4ENGINEBASE_P_H |
41 | |
42 | // |
43 | // W A R N I N G |
44 | // ------------- |
45 | // |
46 | // This file is not part of the Qt API. It exists purely as an |
47 | // implementation detail. This header file may change from version to |
48 | // version without notice, or even be removed. |
49 | // |
50 | // We mean it. |
51 | // |
52 | |
53 | #include <private/qv4global_p.h> |
54 | #include <private/qv4runtimeapi_p.h> |
55 | |
56 | QT_BEGIN_NAMESPACE |
57 | |
58 | namespace QV4 { |
59 | |
60 | struct CppStackFrame; |
61 | |
62 | // Base class for the execution engine |
63 | |
64 | #if defined(Q_CC_MSVC) || defined(Q_CC_GNU) |
65 | #pragma pack(push, 1) |
66 | #endif |
67 | struct Q_QML_EXPORT EngineBase { |
68 | |
69 | CppStackFrame *currentStackFrame = nullptr; |
70 | |
71 | Value *jsStackTop = nullptr; |
72 | |
73 | // The JIT expects hasException and isInterrupted to be in the same 32bit word in memory. |
74 | quint8 hasException = false; |
75 | // isInterrupted is expected to be set from a different thread |
76 | #if defined(Q_ATOMIC_INT8_IS_SUPPORTED) |
77 | QAtomicInteger<quint8> isInterrupted = false; |
78 | quint16 unused = 0; |
79 | #elif defined(Q_ATOMIC_INT16_IS_SUPPORTED) |
80 | quint8 unused = 0; |
81 | QAtomicInteger<quint16> isInterrupted = false; |
82 | #else |
83 | # error V4 needs either 8bit or 16bit atomics. |
84 | #endif |
85 | |
86 | quint8 isExecutingInRegExpJIT = false; |
87 | quint8 padding[3]; |
88 | MemoryManager *memoryManager = nullptr; |
89 | |
90 | qint32 callDepth = 0; |
91 | Value *jsStackLimit = nullptr; |
92 | Value *jsStackBase = nullptr; |
93 | |
94 | IdentifierTable *identifierTable = nullptr; |
95 | Object *globalObject = nullptr; |
96 | |
97 | // Exception handling |
98 | Value *exceptionValue = nullptr; |
99 | |
100 | enum InternalClassType { |
101 | Class_Empty, |
102 | Class_String, |
103 | Class_MemberData, |
104 | Class_SimpleArrayData, |
105 | Class_SparseArrayData, |
106 | Class_ExecutionContext, |
107 | Class_CallContext, |
108 | Class_QmlContext, |
109 | Class_Object, |
110 | Class_ArrayObject, |
111 | Class_FunctionObject, |
112 | Class_ArrowFunction, |
113 | Class_GeneratorFunction, |
114 | Class_GeneratorObject, |
115 | Class_StringObject, |
116 | Class_SymbolObject, |
117 | Class_ScriptFunction, |
118 | Class_ConstructorFunction, |
119 | Class_MemberFunction, |
120 | Class_MemberGeneratorFunction, |
121 | Class_ObjectProto, |
122 | Class_RegExp, |
123 | Class_RegExpObject, |
124 | Class_RegExpExecArray, |
125 | Class_ArgumentsObject, |
126 | Class_StrictArgumentsObject, |
127 | Class_ErrorObject, |
128 | Class_ErrorObjectWithMessage, |
129 | Class_ErrorProto, |
130 | Class_QmlContextWrapper, |
131 | Class_ProxyObject, |
132 | Class_ProxyFunctionObject, |
133 | Class_Symbol, |
134 | NClasses |
135 | }; |
136 | Heap::InternalClass *classes[NClasses]; |
137 | Heap::InternalClass *internalClasses(InternalClassType icType) { return classes[icType]; } |
138 | }; |
139 | #if defined(Q_CC_MSVC) || defined(Q_CC_GNU) |
140 | #pragma pack(pop) |
141 | #endif |
142 | |
143 | Q_STATIC_ASSERT(std::is_standard_layout<EngineBase>::value); |
144 | Q_STATIC_ASSERT(offsetof(EngineBase, currentStackFrame) == 0); |
145 | Q_STATIC_ASSERT(offsetof(EngineBase, jsStackTop) == offsetof(EngineBase, currentStackFrame) + QT_POINTER_SIZE); |
146 | Q_STATIC_ASSERT(offsetof(EngineBase, hasException) == offsetof(EngineBase, jsStackTop) + QT_POINTER_SIZE); |
147 | Q_STATIC_ASSERT(offsetof(EngineBase, memoryManager) == offsetof(EngineBase, hasException) + 8); |
148 | Q_STATIC_ASSERT(offsetof(EngineBase, isInterrupted) + sizeof(EngineBase::isInterrupted) <= offsetof(EngineBase, hasException) + 4); |
149 | |
150 | } |
151 | |
152 | QT_END_NAMESPACE |
153 | |
154 | #endif |
155 | |