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| ** Copyright (C) 2017 The Qt Company Ltd. |
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| ** |
| ** This file is part of the QtQml module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
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| ****************************************************************************/ |
| #ifndef QV4ENGINEBASE_P_H |
| #define QV4ENGINEBASE_P_H |
| |
| // |
| // W A R N I N G |
| // ------------- |
| // |
| // This file is not part of the Qt API. It exists purely as an |
| // implementation detail. This header file may change from version to |
| // version without notice, or even be removed. |
| // |
| // We mean it. |
| // |
| |
| #include <private/qv4global_p.h> |
| #include <private/qv4runtimeapi_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QV4 { |
| |
| struct CppStackFrame; |
| |
| // Base class for the execution engine |
| |
| #if defined(Q_CC_MSVC) || defined(Q_CC_GNU) |
| #pragma pack(push, 1) |
| #endif |
| struct Q_QML_EXPORT EngineBase { |
| |
| CppStackFrame *currentStackFrame = nullptr; |
| |
| Value *jsStackTop = nullptr; |
| |
| // The JIT expects hasException and isInterrupted to be in the same 32bit word in memory. |
| quint8 hasException = false; |
| // isInterrupted is expected to be set from a different thread |
| #if defined(Q_ATOMIC_INT8_IS_SUPPORTED) |
| QAtomicInteger<quint8> isInterrupted = false; |
| quint16 unused = 0; |
| #elif defined(Q_ATOMIC_INT16_IS_SUPPORTED) |
| quint8 unused = 0; |
| QAtomicInteger<quint16> isInterrupted = false; |
| #else |
| # error V4 needs either 8bit or 16bit atomics. |
| #endif |
| |
| quint8 isExecutingInRegExpJIT = false; |
| quint8 padding[3]; |
| MemoryManager *memoryManager = nullptr; |
| |
| qint32 callDepth = 0; |
| Value *jsStackLimit = nullptr; |
| Value *jsStackBase = nullptr; |
| |
| IdentifierTable *identifierTable = nullptr; |
| Object *globalObject = nullptr; |
| |
| // Exception handling |
| Value *exceptionValue = nullptr; |
| |
| enum InternalClassType { |
| Class_Empty, |
| Class_String, |
| Class_MemberData, |
| Class_SimpleArrayData, |
| Class_SparseArrayData, |
| Class_ExecutionContext, |
| Class_CallContext, |
| Class_QmlContext, |
| Class_Object, |
| Class_ArrayObject, |
| Class_FunctionObject, |
| Class_ArrowFunction, |
| Class_GeneratorFunction, |
| Class_GeneratorObject, |
| Class_StringObject, |
| Class_SymbolObject, |
| Class_ScriptFunction, |
| Class_ConstructorFunction, |
| Class_MemberFunction, |
| Class_MemberGeneratorFunction, |
| Class_ObjectProto, |
| Class_RegExp, |
| Class_RegExpObject, |
| Class_RegExpExecArray, |
| Class_ArgumentsObject, |
| Class_StrictArgumentsObject, |
| Class_ErrorObject, |
| Class_ErrorObjectWithMessage, |
| Class_ErrorProto, |
| Class_QmlContextWrapper, |
| Class_ProxyObject, |
| Class_ProxyFunctionObject, |
| Class_Symbol, |
| NClasses |
| }; |
| Heap::InternalClass *classes[NClasses]; |
| Heap::InternalClass *internalClasses(InternalClassType icType) { return classes[icType]; } |
| }; |
| #if defined(Q_CC_MSVC) || defined(Q_CC_GNU) |
| #pragma pack(pop) |
| #endif |
| |
| Q_STATIC_ASSERT(std::is_standard_layout<EngineBase>::value); |
| Q_STATIC_ASSERT(offsetof(EngineBase, currentStackFrame) == 0); |
| Q_STATIC_ASSERT(offsetof(EngineBase, jsStackTop) == offsetof(EngineBase, currentStackFrame) + QT_POINTER_SIZE); |
| Q_STATIC_ASSERT(offsetof(EngineBase, hasException) == offsetof(EngineBase, jsStackTop) + QT_POINTER_SIZE); |
| Q_STATIC_ASSERT(offsetof(EngineBase, memoryManager) == offsetof(EngineBase, hasException) + 8); |
| Q_STATIC_ASSERT(offsetof(EngineBase, isInterrupted) + sizeof(EngineBase::isInterrupted) <= offsetof(EngineBase, hasException) + 4); |
| |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif |