1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2017 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 #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]; internalClassesEngineBase137 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