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39 | #ifndef QV4PROPERTYDESCRIPTOR_H |
40 | #define QV4PROPERTYDESCRIPTOR_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 "qv4value_p.h" |
55 | |
56 | QT_BEGIN_NAMESPACE |
57 | |
58 | namespace QV4 { |
59 | |
60 | struct FunctionObject; |
61 | |
62 | struct Property { |
63 | Value value; |
64 | Value set; |
65 | |
66 | // Section 8.10 |
67 | inline void fullyPopulated(PropertyAttributes *attrs) { |
68 | if (!attrs->hasType()) { |
69 | value = Value::undefinedValue(); |
70 | } |
71 | if (attrs->type() == PropertyAttributes::Accessor) { |
72 | attrs->clearWritable(); |
73 | if (value.isEmpty()) |
74 | value = Value::undefinedValue(); |
75 | if (set.isEmpty()) |
76 | set = Value::undefinedValue(); |
77 | } |
78 | attrs->resolve(); |
79 | } |
80 | |
81 | // ES8: 6.2.5.6 |
82 | void completed(PropertyAttributes *attrs) { |
83 | if (value.isEmpty()) |
84 | value = Encode::undefined(); |
85 | if (attrs->isGeneric() || attrs->isData()) { |
86 | attrs->setType(PropertyAttributes::Data); |
87 | if (!attrs->hasWritable()) |
88 | attrs->setWritable(false); |
89 | } else { |
90 | if (set.isEmpty()) |
91 | set = Encode::undefined(); |
92 | } |
93 | if (!attrs->hasEnumerable()) |
94 | attrs->setEnumerable(false); |
95 | if (!attrs->hasConfigurable()) |
96 | attrs->setConfigurable(false); |
97 | } |
98 | |
99 | inline bool isSubset(const PropertyAttributes &attrs, const Property *other, PropertyAttributes otherAttrs) const; |
100 | inline void merge(PropertyAttributes &attrs, const Property *other, PropertyAttributes otherAttrs); |
101 | |
102 | inline Heap::FunctionObject *getter() const { return reinterpret_cast<Heap::FunctionObject *>(value.heapObject()); } |
103 | inline Heap::FunctionObject *setter() const { return reinterpret_cast<Heap::FunctionObject *>(set.heapObject()); } |
104 | inline void setGetter(FunctionObject *g) { value = reinterpret_cast<Managed *>(g); } |
105 | inline void setSetter(FunctionObject *s) { set = (s ? reinterpret_cast<Managed *>(s) : nullptr); } |
106 | |
107 | void copy(const Property *other, PropertyAttributes attrs) { |
108 | value = other->value; |
109 | if (attrs.isAccessor()) |
110 | set = other->set; |
111 | } |
112 | |
113 | // ES8, section 9.1.6.2/9,.1.6.3 |
114 | bool isCompatible(PropertyAttributes &attrs, const Property *other, PropertyAttributes otherAttrs) const { |
115 | if (otherAttrs.isEmpty()) |
116 | return true; |
117 | if (!attrs.isConfigurable()) { |
118 | if (otherAttrs.hasConfigurable() && otherAttrs.isConfigurable()) |
119 | return false; |
120 | if (otherAttrs.hasEnumerable() && otherAttrs.isEnumerable() != attrs.isEnumerable()) |
121 | return false; |
122 | } |
123 | if (otherAttrs.isGeneric()) |
124 | return true; |
125 | if (attrs.isData() != otherAttrs.isData()) { |
126 | if (!attrs.isConfigurable()) |
127 | return false; |
128 | } else if (attrs.isData() && otherAttrs.isData()) { |
129 | if (!attrs.isConfigurable() && !attrs.isWritable()) { |
130 | if (otherAttrs.hasWritable() && otherAttrs.isWritable()) |
131 | return false; |
132 | if (!other->value.isEmpty() && !value.sameValue(other: other->value)) |
133 | return false; |
134 | } |
135 | } else if (attrs.isAccessor() && otherAttrs.isAccessor()) { |
136 | if (!attrs.isConfigurable()) { |
137 | if (!other->value.isEmpty() && !value.sameValue(other: other->value)) |
138 | return false; |
139 | if (!other->set.isEmpty() && !set.sameValue(other: other->set)) |
140 | return false; |
141 | } |
142 | } |
143 | return true; |
144 | } |
145 | |
146 | |
147 | explicit Property() { value = Encode::undefined(); set = Value::fromHeapObject(m: nullptr); } |
148 | Property(Heap::FunctionObject *getter, Heap::FunctionObject *setter) { |
149 | value.setM(reinterpret_cast<Heap::Base *>(getter)); |
150 | set.setM(reinterpret_cast<Heap::Base *>(setter)); |
151 | } |
152 | private: |
153 | Q_DISABLE_COPY(Property) |
154 | }; |
155 | |
156 | inline bool Property::isSubset(const PropertyAttributes &attrs, const Property *other, PropertyAttributes otherAttrs) const |
157 | { |
158 | if (attrs.type() != PropertyAttributes::Generic && attrs.type() != otherAttrs.type()) |
159 | return false; |
160 | if (attrs.hasEnumerable() && attrs.isEnumerable() != otherAttrs.isEnumerable()) |
161 | return false; |
162 | if (attrs.hasConfigurable() && attrs.isConfigurable() != otherAttrs.isConfigurable()) |
163 | return false; |
164 | if (attrs.hasWritable() && attrs.isWritable() != otherAttrs.isWritable()) |
165 | return false; |
166 | if (attrs.type() == PropertyAttributes::Data && !value.sameValue(other: other->value)) |
167 | return false; |
168 | if (attrs.type() == PropertyAttributes::Accessor) { |
169 | if (value.heapObject() != other->value.heapObject()) |
170 | return false; |
171 | if (set.heapObject() != other->set.heapObject()) |
172 | return false; |
173 | } |
174 | return true; |
175 | } |
176 | |
177 | inline void Property::merge(PropertyAttributes &attrs, const Property *other, PropertyAttributes otherAttrs) |
178 | { |
179 | if (otherAttrs.hasEnumerable()) |
180 | attrs.setEnumerable(otherAttrs.isEnumerable()); |
181 | if (otherAttrs.hasConfigurable()) |
182 | attrs.setConfigurable(otherAttrs.isConfigurable()); |
183 | if (otherAttrs.hasWritable()) |
184 | attrs.setWritable(otherAttrs.isWritable()); |
185 | if (otherAttrs.type() == PropertyAttributes::Accessor) { |
186 | attrs.setType(PropertyAttributes::Accessor); |
187 | if (!other->value.isEmpty()) |
188 | value = other->value; |
189 | if (!other->set.isEmpty()) |
190 | set = other->set; |
191 | } else if (otherAttrs.type() == PropertyAttributes::Data){ |
192 | attrs.setType(PropertyAttributes::Data); |
193 | value = other->value; |
194 | } |
195 | } |
196 | |
197 | struct PropertyIndex { |
198 | Heap::Base *base; |
199 | Value *slot; |
200 | |
201 | void set(EngineBase *e, Value newVal) { |
202 | WriteBarrier::write(engine: e, base, slot: slot->data_ptr(), value: newVal.asReturnedValue()); |
203 | } |
204 | const Value *operator->() const { return slot; } |
205 | const Value &operator*() const { return *slot; } |
206 | bool isNull() const { return !slot; } |
207 | }; |
208 | |
209 | |
210 | } |
211 | |
212 | Q_DECLARE_TYPEINFO(QV4::Property, Q_MOVABLE_TYPE); |
213 | |
214 | QT_END_NAMESPACE |
215 | |
216 | #endif |
217 | |