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 #ifndef QV4LOOKUP_H 40 #define QV4LOOKUP_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 "qv4global_p.h" 54 #include "qv4runtime_p.h" 55 #include "qv4engine_p.h" 56 #include "qv4context_p.h" 57 #include "qv4object_p.h" 58 #include "qv4internalclass_p.h" 59 60 QT_BEGIN_NAMESPACE 61 62 namespace QV4 { 63 64 struct Q_QML_PRIVATE_EXPORT Lookup { 65 union { 66 ReturnedValue (*getter)(Lookup *l, ExecutionEngine *engine, const Value &object); 67 ReturnedValue (*globalGetter)(Lookup *l, ExecutionEngine *engine); 68 ReturnedValue (*qmlContextPropertyGetter)(Lookup *l, ExecutionEngine *engine, Value *thisObject); 69 bool (*setter)(Lookup *l, ExecutionEngine *engine, Value &object, const Value &v); 70 }; 71 // NOTE: gc assumes the first two entries in the struct are pointers to heap objects or null 72 union { 73 struct { 74 Heap::Base *h1; 75 Heap::Base *h2; 76 quintptr unused; 77 quintptr unused2; 78 } markDef; 79 struct { 80 Heap::InternalClass *ic; 81 quintptr unused; 82 uint index; 83 uint offset; 84 } objectLookup; 85 struct { 86 quintptr protoId; 87 quintptr _unused; 88 const Value *data; 89 } protoLookup; 90 struct { 91 Heap::InternalClass *ic; 92 Heap::InternalClass *ic2; 93 uint offset; 94 uint offset2; 95 } objectLookupTwoClasses; 96 struct { 97 quintptr protoId; 98 quintptr protoId2; 99 const Value *data; 100 const Value *data2; 101 } protoLookupTwoClasses; 102 struct { 103 // Make sure the next two values are in sync with protoLookup 104 quintptr protoId; 105 Heap::Object *proto; 106 const Value *data; 107 quintptr type; 108 } primitiveLookup; 109 struct { 110 Heap::InternalClass *newClass; 111 quintptr protoId; 112 uint offset; 113 uint unused; 114 } insertionLookup; 115 struct { 116 quintptr _unused; 117 quintptr _unused2; 118 uint index; 119 uint unused; 120 } indexedLookup; 121 struct { 122 Heap::InternalClass *ic; 123 Heap::InternalClass *qmlTypeIc; // only used when lookup goes through QQmlTypeWrapper 124 QQmlPropertyCache *propertyCache; 125 QQmlPropertyData *propertyData; 126 } qobjectLookup; 127 struct { 128 Heap::InternalClass *ic; 129 quintptr unused; 130 QQmlPropertyCache *propertyCache; 131 QQmlPropertyData *propertyData; 132 } qgadgetLookup; 133 struct { 134 quintptr unused1; 135 quintptr unused2; 136 int scriptIndex; 137 } qmlContextScriptLookup; 138 struct { 139 Heap::Object *singleton; 140 quintptr unused; 141 } qmlContextSingletonLookup; 142 struct { 143 quintptr unused1; 144 quintptr unused2; 145 int objectId; 146 } qmlContextIdObjectLookup; 147 struct { 148 // Same as protoLookup, as used for global lookups 149 quintptr reserved1; 150 quintptr reserved2; 151 quintptr reserved3; 152 ReturnedValue (*getterTrampoline)(Lookup *l, ExecutionEngine *engine); 153 } qmlContextGlobalLookup; 154 struct { 155 Heap::Object *qmlTypeWrapper; 156 quintptr unused2; 157 } qmlTypeLookup; 158 struct { 159 Heap::InternalClass *ic; 160 quintptr unused; 161 ReturnedValue encodedEnumValue; 162 } qmlEnumValueLookup; 163 struct { 164 Heap::InternalClass *ic; 165 Heap::Object *qmlScopedEnumWrapper; 166 } qmlScopedEnumWrapperLookup; 167 }; 168 uint nameIndex; 169 170 ReturnedValue resolveGetter(ExecutionEngine *engine, const Object *object); 171 ReturnedValue resolvePrimitiveGetter(ExecutionEngine *engine, const Value &object); 172 ReturnedValue resolveGlobalGetter(ExecutionEngine *engine); 173 void resolveProtoGetter(PropertyKey name, const Heap::Object *proto); 174 175 static ReturnedValue getterGeneric(Lookup *l, ExecutionEngine *engine, const Value &object); 176 static ReturnedValue getterTwoClasses(Lookup *l, ExecutionEngine *engine, const Value &object); 177 static ReturnedValue getterFallback(Lookup *l, ExecutionEngine *engine, const Value &object); 178 179 static ReturnedValue getter0MemberData(Lookup *l, ExecutionEngine *engine, const Value &object); 180 static ReturnedValue getter0Inline(Lookup *l, ExecutionEngine *engine, const Value &object); 181 static ReturnedValue getterProto(Lookup *l, ExecutionEngine *engine, const Value &object); 182 static ReturnedValue getter0Inlinegetter0Inline(Lookup *l, ExecutionEngine *engine, const Value &object); 183 static ReturnedValue getter0Inlinegetter0MemberData(Lookup *l, ExecutionEngine *engine, const Value &object); 184 static ReturnedValue getter0MemberDatagetter0MemberData(Lookup *l, ExecutionEngine *engine, const Value &object); 185 static ReturnedValue getterProtoTwoClasses(Lookup *l, ExecutionEngine *engine, const Value &object); 186 static ReturnedValue getterAccessor(Lookup *l, ExecutionEngine *engine, const Value &object); 187 static ReturnedValue getterProtoAccessor(Lookup *l, ExecutionEngine *engine, const Value &object); 188 static ReturnedValue getterProtoAccessorTwoClasses(Lookup *l, ExecutionEngine *engine, const Value &object); 189 static ReturnedValue getterIndexed(Lookup *l, ExecutionEngine *engine, const Value &object); 190 191 static ReturnedValue primitiveGetterProto(Lookup *l, ExecutionEngine *engine, const Value &object); 192 static ReturnedValue primitiveGetterAccessor(Lookup *l, ExecutionEngine *engine, const Value &object); 193 static ReturnedValue stringLengthGetter(Lookup *l, ExecutionEngine *engine, const Value &object); 194 195 static ReturnedValue globalGetterGeneric(Lookup *l, ExecutionEngine *engine); 196 static ReturnedValue globalGetterProto(Lookup *l, ExecutionEngine *engine); 197 static ReturnedValue globalGetterProtoAccessor(Lookup *l, ExecutionEngine *engine); 198 199 bool resolveSetter(ExecutionEngine *engine, Object *object, const Value &value); 200 static bool setterGeneric(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); 201 Q_NEVER_INLINE static bool setterTwoClasses(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); 202 static bool setterFallback(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); 203 static bool setter0MemberData(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); 204 static bool setter0Inline(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); 205 static bool setter0setter0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); 206 static bool setterInsert(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); 207 static bool arrayLengthSetter(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); 208 markObjectsLookup209 void markObjects(MarkStack *stack) { 210 if (markDef.h1 && !(reinterpret_cast<quintptr>(markDef.h1) & 1)) 211 markDef.h1->mark(stack); 212 if (markDef.h2 && !(reinterpret_cast<quintptr>(markDef.h2) & 1)) 213 markDef.h2->mark(stack); 214 } 215 clearLookup216 void clear() { 217 memset(&markDef, 0, sizeof(markDef)); 218 } 219 }; 220 221 Q_STATIC_ASSERT(std::is_standard_layout<Lookup>::value); 222 // Ensure that these offsets are always at this point to keep generated code compatible 223 // across 32-bit and 64-bit (matters when cross-compiling). 224 Q_STATIC_ASSERT(offsetof(Lookup, getter) == 0); 225 226 } 227 228 QT_END_NAMESPACE 229 230 #endif 231