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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; | |
24 if (it->state() == LookupIterator::JSPROXY) { | |
arv (Not doing code reviews)
2014/07/23 23:10:40
Toon, this is a bit ugly. I was considering adding
| |
25 object = it->GetJSProxy(); | |
26 } else { | |
27 object = it->GetHolder(); | |
28 } | |
29 | |
30 if (!JSReceiver::HasOwnProperty(object, unscopables_symbol)) return false; | |
31 Handle<Object> unscopables; | |
32 MaybeHandle<Object> maybe_unscopables = | |
33 Object::GetProperty(object, unscopables_symbol); | |
34 if (!maybe_unscopables.ToHandle(&unscopables)) return false; | |
35 if (!unscopables->IsSpecObject()) return false; | |
36 return JSReceiver::HasOwnProperty(Handle<JSReceiver>::cast(unscopables), | |
37 it->name()); | |
38 } | |
39 | |
40 | |
41 /** | |
42 * Lookups a property in an object environment, taking the unscopables into | |
43 * account. This is used For HasBinding and GetBindingValue spec algorithms for | |
44 * ObjectEnvironment. | |
45 */ | |
46 static PropertyAttributes UnscopableLookup(LookupIterator* it) { | |
47 PropertyAttributes attrs; | |
48 while ((attrs = JSReceiver::GetPropertyAttributes(it)) != ABSENT) { | |
49 if (!BlockedByUnscopables(it)) { | |
50 return attrs; | |
51 } | |
52 it->Next(); | |
53 } | |
54 | |
55 return ABSENT; | |
56 } | |
57 } | |
58 | |
59 } // namespace v8::internal | |
60 | |
61 #endif // V8_UNSCOPABLES_H_ | |
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