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1 // Copyright 2014 the V8 project authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef V8_UNSCOPABLES_H_ | |
6 #define V8_UNSCOPABLES_H_ | |
7 | |
8 #include "src/isolate.h" | |
9 #include "src/lookup.h" | |
10 #include "src/objects.h" | |
11 #include "src/prototype.h" | |
12 | |
13 namespace v8 { | |
14 namespace internal { | |
15 | |
16 | |
17 static bool BlockedByUnscopables(LookupIterator* it) { | |
18 Isolate* isolate = it->isolate(); | |
19 Handle<Symbol> unscopables_symbol( | |
20 isolate->native_context()->unscopables_symbol(), isolate); | |
21 | |
22 // TODO(arv): This should be GetNonHiddenHolder | |
23 Handle<JSReceiver> object = it->GetHolder<JSReceiver>(); | |
24 if (!JSReceiver::HasOwnProperty(object, unscopables_symbol)) return false; | |
25 Handle<Object> unscopables; | |
26 MaybeHandle<Object> maybe_unscopables = | |
27 Object::GetProperty(object, unscopables_symbol); | |
28 if (!maybe_unscopables.ToHandle(&unscopables)) return false; | |
Toon Verwaest
2014/07/25 10:09:41
Maybe add a comment here saying that you return fa
| |
29 if (!unscopables->IsSpecObject()) return false; | |
30 return JSReceiver::HasOwnProperty(Handle<JSReceiver>::cast(unscopables), | |
Toon Verwaest
2014/07/25 10:09:41
This HasOwnProperty can cause an exception at leas
| |
31 it->name()); | |
32 } | |
33 | |
34 | |
35 /** | |
36 * Lookups a property in an object environment, taking the unscopables into | |
37 * account. This is used For HasBinding and GetBindingValue spec algorithms for | |
38 * ObjectEnvironment. | |
39 */ | |
40 static PropertyAttributes UnscopableLookup(LookupIterator* it) { | |
41 PropertyAttributes attrs; | |
42 while ((attrs = JSReceiver::GetPropertyAttributes(it)) != ABSENT) { | |
Toon Verwaest
2014/07/25 10:09:41
At least GetPropertyAttributesWithHandler will ret
| |
43 if (!BlockedByUnscopables(it)) { | |
44 return attrs; | |
45 } | |
46 it->Next(); | |
47 } | |
48 | |
49 return ABSENT; | |
50 } | |
51 } | |
52 | |
53 } // namespace v8::internal | |
54 | |
55 #endif // V8_UNSCOPABLES_H_ | |
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