1/*
2 * Copyright (C) 2015-2019 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#pragma once
27
28#include "JSSegmentedVariableObject.h"
29
30namespace JSC {
31
32class JSGlobalLexicalEnvironment final : public JSSegmentedVariableObject {
33
34public:
35 using Base = JSSegmentedVariableObject;
36
37 static constexpr unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot;
38
39 static JSGlobalLexicalEnvironment* create(VM& vm, Structure* structure, JSScope* parentScope)
40 {
41 JSGlobalLexicalEnvironment* result =
42 new (NotNull, allocateCell<JSGlobalLexicalEnvironment>(vm.heap)) JSGlobalLexicalEnvironment(vm, structure, parentScope);
43 result->finishCreation(vm);
44 result->symbolTable()->setScopeType(SymbolTable::ScopeType::GlobalLexicalScope);
45 return result;
46 }
47
48 static bool getOwnPropertySlot(JSObject*, JSGlobalObject*, PropertyName, PropertySlot&);
49 static bool put(JSCell*, JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
50
51 static void destroy(JSCell*);
52 // We don't need a destructor because we use a finalizer instead.
53 static constexpr bool needsDestruction = false;
54
55 bool isEmpty() const { return !symbolTable()->size(); }
56 bool isConstVariable(UniquedStringImpl*);
57
58 DECLARE_INFO;
59
60 static Structure* createStructure(VM& vm, JSGlobalObject* globalObject)
61 {
62 return Structure::create(vm, globalObject, jsNull(), TypeInfo(GlobalLexicalEnvironmentType, StructureFlags), info());
63 }
64
65protected:
66 JSGlobalLexicalEnvironment(VM& vm, Structure* structure, JSScope* scope)
67 : Base(vm, structure, scope)
68 {
69 }
70};
71
72} // namespace JSC
73