1/*
2 * Copyright (C) 2014 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 "JSGlobalObject.h"
29#include "JSObject.h"
30#include "JSScope.h"
31
32namespace JSC {
33
34class JSGlobalObject;
35class LLIntOffsetsExtractor;
36
37
38class JSCallee : public JSNonFinalObject {
39 friend class JIT;
40#if ENABLE(DFG_JIT)
41 friend class DFG::SpeculativeJIT;
42 friend class DFG::JITCompiler;
43#endif
44 friend class VM;
45
46public:
47 typedef JSNonFinalObject Base;
48 static constexpr unsigned StructureFlags = Base::StructureFlags | ImplementsHasInstance | ImplementsDefaultHasInstance;
49
50 static JSCallee* create(VM& vm, JSGlobalObject* globalObject, JSScope* scope)
51 {
52 JSCallee* callee = new (NotNull, allocateCell<JSCallee>(vm.heap)) JSCallee(vm, scope, globalObject->calleeStructure());
53 callee->finishCreation(vm);
54 return callee;
55 }
56
57 JSScope* scope()
58 {
59 return m_scope.get();
60 }
61
62 // This method may be called for host functions, in which case it
63 // will return an arbitrary value. This should only be used for
64 // optimized paths in which the return value does not matter for
65 // host functions, and checking whether the function is a host
66 // function is deemed too expensive.
67 JSScope* scopeUnchecked()
68 {
69 return m_scope.get();
70 }
71
72 void setScope(VM& vm, JSScope* scope)
73 {
74 m_scope.set(vm, this, scope);
75 }
76
77 DECLARE_EXPORT_INFO;
78
79 static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
80 {
81 ASSERT(globalObject);
82 return Structure::create(vm, globalObject, prototype, TypeInfo(JSCalleeType, StructureFlags), info());
83 }
84
85 static inline ptrdiff_t offsetOfScopeChain()
86 {
87 return OBJECT_OFFSETOF(JSCallee, m_scope);
88 }
89
90protected:
91 JS_EXPORT_PRIVATE JSCallee(VM&, JSGlobalObject*, Structure*);
92 JSCallee(VM&, JSScope*, Structure*);
93
94 void finishCreation(VM&);
95 using Base::finishCreation;
96
97 static void visitChildren(JSCell*, SlotVisitor&);
98
99private:
100 friend class LLIntOffsetsExtractor;
101
102 WriteBarrier<JSScope> m_scope;
103};
104
105} // namespace JSC
106