1/*
2 * Copyright (C) 2013, 2016 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "JSMap.h"
28
29#include "JSCInlines.h"
30#include "MapPrototype.h"
31
32namespace JSC {
33
34const ClassInfo JSMap::s_info = { "Map", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSMap) };
35
36String JSMap::toStringName(const JSObject*, JSGlobalObject*)
37{
38 return "Object"_s;
39}
40
41JSMap* JSMap::clone(JSGlobalObject* globalObject, VM& vm, Structure* structure)
42{
43 JSMap* instance = new (NotNull, allocateCell<JSMap>(vm.heap)) JSMap(vm, structure);
44 instance->finishCreation(globalObject, vm, this);
45 return instance;
46}
47
48bool JSMap::isIteratorProtocolFastAndNonObservable()
49{
50 JSGlobalObject* globalObject = this->globalObject();
51 if (!globalObject->isMapPrototypeIteratorProtocolFastAndNonObservable())
52 return false;
53
54 VM& vm = globalObject->vm();
55 Structure* structure = this->structure(vm);
56 // This is the fast case. Many maps will be an original map.
57 if (structure == globalObject->mapStructure())
58 return true;
59
60 if (getPrototypeDirect(vm) != globalObject->mapPrototype())
61 return false;
62
63 if (getDirectOffset(vm, vm.propertyNames->iteratorSymbol) != invalidOffset)
64 return false;
65
66 return true;
67}
68
69bool JSMap::canCloneFastAndNonObservable(Structure* structure)
70{
71 auto setFastAndNonObservable = [&] (Structure* structure) {
72 JSGlobalObject* globalObject = structure->globalObject();
73 if (!globalObject->isMapPrototypeSetFastAndNonObservable())
74 return false;
75
76 if (structure->hasPolyProto())
77 return false;
78
79 if (structure->storedPrototype() != globalObject->mapPrototype())
80 return false;
81
82 return true;
83 };
84
85 return isIteratorProtocolFastAndNonObservable() && setFastAndNonObservable(structure);
86}
87
88}
89