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#ifndef JSCallee_h
27#define JSCallee_h
28
29#include "JSGlobalObject.h"
30#include "JSObject.h"
31#include "JSScope.h"
32
33namespace JSC {
34
35class JSGlobalObject;
36class LLIntOffsetsExtractor;
37
38
39class JSCallee : public JSNonFinalObject {
40 friend class JIT;
41#if ENABLE(DFG_JIT)
42 friend class DFG::SpeculativeJIT;
43 friend class DFG::JITCompiler;
44#endif
45 friend class VM;
46
47public:
48 typedef JSNonFinalObject Base;
49 const static unsigned StructureFlags = Base::StructureFlags | ImplementsHasInstance | ImplementsDefaultHasInstance;
50
51 static JSCallee* create(VM& vm, JSGlobalObject* globalObject, JSScope* scope)
52 {
53 JSCallee* callee = new (NotNull, allocateCell<JSCallee>(vm.heap)) JSCallee(vm, scope, globalObject->calleeStructure());
54 callee->finishCreation(vm);
55 return callee;
56 }
57
58 JSScope* scope()
59 {
60 return m_scope.get();
61 }
62
63 // This method may be called for host functions, in which case it
64 // will return an arbitrary value. This should only be used for
65 // optimized paths in which the return value does not matter for
66 // host functions, and checking whether the function is a host
67 // function is deemed too expensive.
68 JSScope* scopeUnchecked()
69 {
70 return m_scope.get();
71 }
72
73 void setScope(VM& vm, JSScope* scope)
74 {
75 m_scope.set(vm, this, scope);
76 }
77
78 DECLARE_EXPORT_INFO;
79
80 static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
81 {
82 ASSERT(globalObject);
83 return Structure::create(vm, globalObject, prototype, TypeInfo(JSCalleeType, StructureFlags), info());
84 }
85
86 static inline ptrdiff_t offsetOfScopeChain()
87 {
88 return OBJECT_OFFSETOF(JSCallee, m_scope);
89 }
90
91protected:
92 JS_EXPORT_PRIVATE JSCallee(VM&, JSGlobalObject*, Structure*);
93 JSCallee(VM&, JSScope*, Structure*);
94
95 void finishCreation(VM&);
96 using Base::finishCreation;
97
98 static void visitChildren(JSCell*, SlotVisitor&);
99
100private:
101 friend class LLIntOffsetsExtractor;
102
103 WriteBarrier<JSScope> m_scope;
104};
105
106} // namespace JSC
107
108#endif // JSCallee_h
109