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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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88 JSValue* wrapper = JSValue::cast(value); | 88 JSValue* wrapper = JSValue::cast(value); |
89 ASSERT(Isolate::Current()->context()->native_context()->number_function()-> | 89 ASSERT(Isolate::Current()->context()->native_context()->number_function()-> |
90 has_initial_map()); | 90 has_initial_map()); |
91 Map* number_map = Isolate::Current()->context()->native_context()-> | 91 Map* number_map = Isolate::Current()->context()->native_context()-> |
92 number_function()->initial_map(); | 92 number_function()->initial_map(); |
93 if (wrapper->map() == number_map) return wrapper->value(); | 93 if (wrapper->map() == number_map) return wrapper->value(); |
94 return value; | 94 return value; |
95 } | 95 } |
96 | 96 |
97 | 97 |
98 static MaybeObject* ArraySetLengthObserved(Isolate* isolate, | |
99 Handle<JSArray> array, | |
100 Handle<Object> new_length_handle) { | |
101 List<Handle<String> > indices; | |
102 List<Handle<Object> > old_values; | |
103 Handle<Object> old_length_handle(array->length(), isolate); | |
104 uint32_t old_length = 0; | |
105 CHECK(old_length_handle->ToArrayIndex(&old_length)); | |
106 uint32_t new_length = 0; | |
107 CHECK(new_length_handle->ToArrayIndex(&new_length)); | |
108 // TODO(adamk): This loop can be very slow for arrays in dictionary mode. | |
109 // Find another way to iterate over arrays with dictionary elements. | |
110 for (uint32_t i = old_length - 1; i + 1 > new_length; --i) { | |
111 PropertyAttributes attributes = array->GetLocalElementAttribute(i); | |
112 if (attributes == ABSENT) continue; | |
113 // A non-configurable property will cause the truncation operation to | |
114 // stop at this index. | |
115 if (attributes == DONT_DELETE) break; | |
116 // TODO(adamk): Don't fetch the old value if it's an accessor. | |
117 old_values.Add(Object::GetElement(array, i)); | |
118 indices.Add(isolate->factory()->Uint32ToString(i)); | |
119 } | |
120 | |
121 MaybeObject* result = array->SetElementsLength(*new_length_handle); | |
122 Handle<Object> hresult; | |
123 if (!result->ToHandle(&hresult)) return result; | |
124 | |
125 CHECK(array->length()->ToArrayIndex(&new_length)); | |
126 if (old_length != new_length) { | |
127 for (int i = 0; i < indices.length(); ++i) { | |
128 JSObject::EnqueueChangeRecord( | |
129 array, "deleted", indices[i], old_values[i]); | |
130 } | |
131 JSObject::EnqueueChangeRecord( | |
132 array, "updated", isolate->factory()->length_symbol(), | |
133 old_length_handle); | |
134 } | |
135 return *hresult; | |
136 } | |
137 | |
138 | |
139 MaybeObject* Accessors::ArraySetLength(JSObject* object, Object* value, void*) { | 98 MaybeObject* Accessors::ArraySetLength(JSObject* object, Object* value, void*) { |
140 Isolate* isolate = object->GetIsolate(); | 99 Isolate* isolate = object->GetIsolate(); |
141 | 100 |
142 // This means one of the object's prototypes is a JSArray and the | 101 // This means one of the object's prototypes is a JSArray and the |
143 // object does not have a 'length' property. Calling SetProperty | 102 // object does not have a 'length' property. Calling SetProperty |
144 // causes an infinite loop. | 103 // causes an infinite loop. |
145 if (!object->IsJSArray()) { | 104 if (!object->IsJSArray()) { |
146 return object->SetLocalPropertyIgnoreAttributes( | 105 return object->SetLocalPropertyIgnoreAttributes( |
147 isolate->heap()->length_symbol(), value, NONE); | 106 isolate->heap()->length_symbol(), value, NONE); |
148 } | 107 } |
149 | 108 |
150 value = FlattenNumber(value); | 109 value = FlattenNumber(value); |
151 | 110 |
152 // Need to call methods that may trigger GC. | 111 // Need to call methods that may trigger GC. |
153 HandleScope scope(isolate); | 112 HandleScope scope(isolate); |
154 | 113 |
155 // Protect raw pointers. | 114 // Protect raw pointers. |
156 Handle<JSArray> array_handle(JSArray::cast(object), isolate); | 115 Handle<JSArray> array_handle(JSArray::cast(object), isolate); |
157 Handle<Object> value_handle(value, isolate); | 116 Handle<Object> value_handle(value, isolate); |
158 | 117 |
159 bool has_exception; | 118 bool has_exception; |
160 Handle<Object> uint32_v = Execution::ToUint32(value_handle, &has_exception); | 119 Handle<Object> uint32_v = Execution::ToUint32(value_handle, &has_exception); |
161 if (has_exception) return Failure::Exception(); | 120 if (has_exception) return Failure::Exception(); |
162 Handle<Object> number_v = Execution::ToNumber(value_handle, &has_exception); | 121 Handle<Object> number_v = Execution::ToNumber(value_handle, &has_exception); |
163 if (has_exception) return Failure::Exception(); | 122 if (has_exception) return Failure::Exception(); |
164 | 123 |
165 if (uint32_v->Number() == number_v->Number()) { | 124 if (uint32_v->Number() == number_v->Number()) { |
166 if (FLAG_harmony_observation && array_handle->map()->is_observed()) { | 125 return array_handle->SetElementsLength(*uint32_v); |
167 return ArraySetLengthObserved(isolate, array_handle, uint32_v); | |
168 } else { | |
169 return array_handle->SetElementsLength(*uint32_v); | |
170 } | |
171 } | 126 } |
172 return isolate->Throw( | 127 return isolate->Throw( |
173 *isolate->factory()->NewRangeError("invalid_array_length", | 128 *isolate->factory()->NewRangeError("invalid_array_length", |
174 HandleVector<Object>(NULL, 0))); | 129 HandleVector<Object>(NULL, 0))); |
175 } | 130 } |
176 | 131 |
177 | 132 |
178 const AccessorDescriptor Accessors::ArrayLength = { | 133 const AccessorDescriptor Accessors::ArrayLength = { |
179 ArrayGetLength, | 134 ArrayGetLength, |
180 ArraySetLength, | 135 ArraySetLength, |
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893 info->set_data(Smi::FromInt(index)); | 848 info->set_data(Smi::FromInt(index)); |
894 Handle<Object> getter = v8::FromCData(&ModuleGetExport); | 849 Handle<Object> getter = v8::FromCData(&ModuleGetExport); |
895 Handle<Object> setter = v8::FromCData(&ModuleSetExport); | 850 Handle<Object> setter = v8::FromCData(&ModuleSetExport); |
896 info->set_getter(*getter); | 851 info->set_getter(*getter); |
897 if (!(attributes & ReadOnly)) info->set_setter(*setter); | 852 if (!(attributes & ReadOnly)) info->set_setter(*setter); |
898 return info; | 853 return info; |
899 } | 854 } |
900 | 855 |
901 | 856 |
902 } } // namespace v8::internal | 857 } } // namespace v8::internal |
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