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 | #include "qv4qmlcontext_p.h" |
60 | #include <private/qqmltypewrapper_p.h> |
61 | #include <private/qqmlvaluetypewrapper_p.h> |
62 | |
63 | QT_BEGIN_NAMESPACE |
64 | |
65 | namespace QV4 { |
66 | |
67 | // Note: We cannot hide the copy ctor and assignment operator of this class because it needs to |
68 | // be trivially copyable. But you should never ever copy it. There are refcounted members |
69 | // in there. |
70 | struct Q_QML_PRIVATE_EXPORT Lookup { |
71 | union { |
72 | ReturnedValue (*getter)(Lookup *l, ExecutionEngine *engine, const Value &object); |
73 | ReturnedValue (*globalGetter)(Lookup *l, ExecutionEngine *engine); |
74 | ReturnedValue (*qmlContextPropertyGetter)(Lookup *l, ExecutionEngine *engine, Value *thisObject); |
75 | bool (*setter)(Lookup *l, ExecutionEngine *engine, Value &object, const Value &v); |
76 | }; |
77 | // NOTE: gc assumes the first two entries in the struct are pointers to heap objects or null |
78 | union { |
79 | struct { |
80 | Heap::Base *h1; |
81 | Heap::Base *h2; |
82 | quintptr unused; |
83 | quintptr unused2; |
84 | } markDef; |
85 | struct { |
86 | Heap::InternalClass *ic; |
87 | quintptr unused; |
88 | uint index; |
89 | uint offset; |
90 | } objectLookup; |
91 | struct { |
92 | quintptr protoId; |
93 | quintptr _unused; |
94 | const Value *data; |
95 | } protoLookup; |
96 | struct { |
97 | Heap::InternalClass *ic; |
98 | Heap::InternalClass *ic2; |
99 | uint offset; |
100 | uint offset2; |
101 | } objectLookupTwoClasses; |
102 | struct { |
103 | quintptr protoId; |
104 | quintptr protoId2; |
105 | const Value *data; |
106 | const Value *data2; |
107 | } protoLookupTwoClasses; |
108 | struct { |
109 | // Make sure the next two values are in sync with protoLookup |
110 | quintptr protoId; |
111 | Heap::Object *proto; |
112 | const Value *data; |
113 | quintptr type; |
114 | } primitiveLookup; |
115 | struct { |
116 | Heap::InternalClass *newClass; |
117 | quintptr protoId; |
118 | uint offset; |
119 | uint unused; |
120 | } insertionLookup; |
121 | struct { |
122 | quintptr _unused; |
123 | quintptr _unused2; |
124 | uint index; |
125 | uint unused; |
126 | } indexedLookup; |
127 | struct { |
128 | Heap::InternalClass *ic; |
129 | Heap::InternalClass *qmlTypeIc; // only used when lookup goes through QQmlTypeWrapper |
130 | QQmlPropertyCache *propertyCache; |
131 | QQmlPropertyData *propertyData; |
132 | } qobjectLookup; |
133 | struct { |
134 | Heap::InternalClass *ic; |
135 | quintptr unused; |
136 | QQmlPropertyCache *propertyCache; |
137 | QQmlPropertyData *propertyData; |
138 | } qgadgetLookup; |
139 | struct { |
140 | quintptr unused1; |
141 | quintptr unused2; |
142 | int scriptIndex; |
143 | } qmlContextScriptLookup; |
144 | struct { |
145 | Heap::Object *singleton; |
146 | quintptr unused; |
147 | } qmlContextSingletonLookup; |
148 | struct { |
149 | quintptr unused1; |
150 | quintptr unused2; |
151 | int objectId; |
152 | } qmlContextIdObjectLookup; |
153 | struct { |
154 | // Same as protoLookup, as used for global lookups |
155 | quintptr reserved1; |
156 | quintptr reserved2; |
157 | quintptr reserved3; |
158 | ReturnedValue (*getterTrampoline)(Lookup *l, ExecutionEngine *engine); |
159 | } qmlContextGlobalLookup; |
160 | struct { |
161 | Heap::Object *qmlTypeWrapper; |
162 | quintptr unused2; |
163 | } qmlTypeLookup; |
164 | struct { |
165 | Heap::InternalClass *ic; |
166 | quintptr unused; |
167 | ReturnedValue encodedEnumValue; |
168 | } qmlEnumValueLookup; |
169 | struct { |
170 | Heap::InternalClass *ic; |
171 | Heap::Object *qmlScopedEnumWrapper; |
172 | } qmlScopedEnumWrapperLookup; |
173 | }; |
174 | uint nameIndex; |
175 | |
176 | ReturnedValue resolveGetter(ExecutionEngine *engine, const Object *object); |
177 | ReturnedValue resolvePrimitiveGetter(ExecutionEngine *engine, const Value &object); |
178 | ReturnedValue resolveGlobalGetter(ExecutionEngine *engine); |
179 | void resolveProtoGetter(PropertyKey name, const Heap::Object *proto); |
180 | |
181 | static ReturnedValue getterGeneric(Lookup *l, ExecutionEngine *engine, const Value &object); |
182 | static ReturnedValue getterTwoClasses(Lookup *l, ExecutionEngine *engine, const Value &object); |
183 | static ReturnedValue getterFallback(Lookup *l, ExecutionEngine *engine, const Value &object); |
184 | |
185 | static ReturnedValue getter0MemberData(Lookup *l, ExecutionEngine *engine, const Value &object); |
186 | static ReturnedValue getter0Inline(Lookup *l, ExecutionEngine *engine, const Value &object); |
187 | static ReturnedValue getterProto(Lookup *l, ExecutionEngine *engine, const Value &object); |
188 | static ReturnedValue getter0Inlinegetter0Inline(Lookup *l, ExecutionEngine *engine, const Value &object); |
189 | static ReturnedValue getter0Inlinegetter0MemberData(Lookup *l, ExecutionEngine *engine, const Value &object); |
190 | static ReturnedValue getter0MemberDatagetter0MemberData(Lookup *l, ExecutionEngine *engine, const Value &object); |
191 | static ReturnedValue getterProtoTwoClasses(Lookup *l, ExecutionEngine *engine, const Value &object); |
192 | static ReturnedValue getterAccessor(Lookup *l, ExecutionEngine *engine, const Value &object); |
193 | static ReturnedValue getterProtoAccessor(Lookup *l, ExecutionEngine *engine, const Value &object); |
194 | static ReturnedValue getterProtoAccessorTwoClasses(Lookup *l, ExecutionEngine *engine, const Value &object); |
195 | static ReturnedValue getterIndexed(Lookup *l, ExecutionEngine *engine, const Value &object); |
196 | static ReturnedValue getterQObject(Lookup *l, ExecutionEngine *engine, const Value &object); |
197 | |
198 | static ReturnedValue primitiveGetterProto(Lookup *l, ExecutionEngine *engine, const Value &object); |
199 | static ReturnedValue primitiveGetterAccessor(Lookup *l, ExecutionEngine *engine, const Value &object); |
200 | static ReturnedValue stringLengthGetter(Lookup *l, ExecutionEngine *engine, const Value &object); |
201 | |
202 | static ReturnedValue globalGetterGeneric(Lookup *l, ExecutionEngine *engine); |
203 | static ReturnedValue globalGetterProto(Lookup *l, ExecutionEngine *engine); |
204 | static ReturnedValue globalGetterProtoAccessor(Lookup *l, ExecutionEngine *engine); |
205 | |
206 | bool resolveSetter(ExecutionEngine *engine, Object *object, const Value &value); |
207 | static bool setterGeneric(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); |
208 | Q_NEVER_INLINE static bool setterTwoClasses(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); |
209 | static bool setterFallback(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); |
210 | static bool setter0MemberData(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); |
211 | static bool setter0Inline(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); |
212 | static bool setter0setter0(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); |
213 | static bool setterInsert(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); |
214 | static bool arrayLengthSetter(Lookup *l, ExecutionEngine *engine, Value &object, const Value &value); |
215 | |
216 | void markObjects(MarkStack *stack) { |
217 | if (markDef.h1 && !(reinterpret_cast<quintptr>(markDef.h1) & 1)) |
218 | markDef.h1->mark(markStack: stack); |
219 | if (markDef.h2 && !(reinterpret_cast<quintptr>(markDef.h2) & 1)) |
220 | markDef.h2->mark(markStack: stack); |
221 | } |
222 | |
223 | void clear() { |
224 | memset(s: &markDef, c: 0, n: sizeof(markDef)); |
225 | } |
226 | |
227 | void releasePropertyCache() |
228 | { |
229 | if (getter == getterQObject |
230 | || getter == QQmlTypeWrapper::lookupSingletonProperty |
231 | || qmlContextPropertyGetter == QQmlContextWrapper::lookupScopeObjectProperty |
232 | || qmlContextPropertyGetter == QQmlContextWrapper::lookupContextObjectProperty) { |
233 | if (QQmlPropertyCache *pc = qobjectLookup.propertyCache) |
234 | pc->release(); |
235 | } else if (getter == QQmlValueTypeWrapper::lookupGetter) { |
236 | if (QQmlPropertyCache *pc = qgadgetLookup.propertyCache) |
237 | pc->release(); |
238 | } |
239 | } |
240 | }; |
241 | |
242 | Q_STATIC_ASSERT(std::is_standard_layout<Lookup>::value); |
243 | // Ensure that these offsets are always at this point to keep generated code compatible |
244 | // across 32-bit and 64-bit (matters when cross-compiling). |
245 | Q_STATIC_ASSERT(offsetof(Lookup, getter) == 0); |
246 | |
247 | inline void setupQObjectLookup( |
248 | Lookup *lookup, const QQmlData *ddata, QQmlPropertyData *propertyData) |
249 | { |
250 | lookup->releasePropertyCache(); |
251 | Q_ASSERT(ddata->propertyCache != nullptr); |
252 | lookup->qobjectLookup.propertyCache = ddata->propertyCache; |
253 | lookup->qobjectLookup.propertyCache->addref(); |
254 | lookup->qobjectLookup.propertyData = propertyData; |
255 | } |
256 | |
257 | inline void setupQObjectLookup( |
258 | Lookup *lookup, const QQmlData *ddata, QQmlPropertyData *propertyData, |
259 | const Object *self) |
260 | { |
261 | lookup->qobjectLookup.ic = self->internalClass(); |
262 | setupQObjectLookup(lookup, ddata, propertyData); |
263 | } |
264 | |
265 | |
266 | inline void setupQObjectLookup( |
267 | Lookup *lookup, const QQmlData *ddata, QQmlPropertyData *propertyData, |
268 | const Object *self, const Object *qmlType) |
269 | { |
270 | lookup->qobjectLookup.qmlTypeIc = qmlType->internalClass(); |
271 | setupQObjectLookup(lookup, ddata, propertyData, self); |
272 | } |
273 | |
274 | } |
275 | |
276 | QT_END_NAMESPACE |
277 | |
278 | #endif |
279 | |