1/*
2 * Copyright (C) 2011-2018 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 "JSFunction.h"
29
30namespace JSC {
31
32EncodedJSValue JSC_HOST_CALL boundThisNoArgsFunctionCall(ExecState*);
33EncodedJSValue JSC_HOST_CALL boundFunctionCall(ExecState*);
34EncodedJSValue JSC_HOST_CALL boundThisNoArgsFunctionConstruct(ExecState*);
35EncodedJSValue JSC_HOST_CALL boundFunctionConstruct(ExecState*);
36EncodedJSValue JSC_HOST_CALL isBoundFunction(ExecState*);
37EncodedJSValue JSC_HOST_CALL hasInstanceBoundFunction(ExecState*);
38
39class JSBoundFunction final : public JSFunction {
40public:
41 typedef JSFunction Base;
42 const static unsigned StructureFlags = Base::StructureFlags & ~ImplementsDefaultHasInstance;
43 static_assert(StructureFlags & ImplementsHasInstance, "");
44
45 template<typename CellType, SubspaceAccess mode>
46 static IsoSubspace* subspaceFor(VM& vm)
47 {
48 return vm.boundFunctionSpace<mode>();
49 }
50
51 static JSBoundFunction* create(VM&, ExecState*, JSGlobalObject*, JSObject* targetFunction, JSValue boundThis, JSArray* boundArgs, int, const String& name);
52
53 static bool customHasInstance(JSObject*, ExecState*, JSValue);
54
55 JSObject* targetFunction() { return m_targetFunction.get(); }
56 JSValue boundThis() { return m_boundThis.get(); }
57 JSArray* boundArgs() { return m_boundArgs.get(); } // DO NOT allow this array to be mutated!
58 JSArray* boundArgsCopy(ExecState*);
59
60 static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
61 {
62 ASSERT(globalObject);
63 return Structure::create(vm, globalObject, prototype, TypeInfo(JSFunctionType, StructureFlags), info());
64 }
65
66 static ptrdiff_t offsetOfTargetFunction() { return OBJECT_OFFSETOF(JSBoundFunction, m_targetFunction); }
67 static ptrdiff_t offsetOfBoundThis() { return OBJECT_OFFSETOF(JSBoundFunction, m_boundThis); }
68
69 DECLARE_INFO;
70
71protected:
72 static void visitChildren(JSCell*, SlotVisitor&);
73
74private:
75 JSBoundFunction(VM&, JSGlobalObject*, Structure*, JSObject* targetFunction, JSValue boundThis, JSArray* boundArgs);
76
77 void finishCreation(VM&, NativeExecutable*, int length);
78
79 WriteBarrier<JSObject> m_targetFunction;
80 WriteBarrier<Unknown> m_boundThis;
81 WriteBarrier<JSArray> m_boundArgs;
82};
83
84} // namespace JSC
85