1  /*
 2   * Copyright (C) 2017-2020 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  #if ENABLE(JIT)
29  
30  #include "MacroAssemblerCodeRef.h"
31  #include "ProxyableAccessCase.h"
32  
33  namespace JSC {
34  
35  class GetterSetterAccessCase final : public ProxyableAccessCase {
36  public:
37      typedef ProxyableAccessCase Base;
38      friend class AccessCase;
39  
40      // This can return null if it hasn't been generated yet. That's
41      // actually somewhat likely because of how we do buffering of new cases.
42      // CallLinkInfo's ownership is held both by generated code via GCAwareJITStubRoutine and PolymorphicAccess.
43      // The ownership relation is PolymorphicAccess -> GCAwareJITStubRoutine -> CallLinkInfo.
44      // PolymorphicAccess can be destroyed while GCAwareJITStubRoutine is alive if we are destroying PolymorphicAccess
45      // while we are executing GCAwareJITStubRoutine. It is not possible that GetterSetterAccessCase is alive while
46      // GCAwareJITStubRoutine is destroyed.
47      CallLinkInfo* callLinkInfo() const { return m_callLinkInfo; }
48      JSObject* customSlotBase() const { return m_customSlotBase.get(); }
49      Optional<DOMAttributeAnnotation> domAttribute() const { return m_domAttribute; }
50  
51      bool hasAlternateBase() const final;
52      JSObject* alternateBase() const final;
53  
54      void emitDOMJITGetter(AccessGenerationState&, const DOMJIT::GetterSetter*, GPRReg baseForGetGPR);
55  
56      static std::unique_ptr<AccessCase> create(
57          VM&, JSCell* owner, AccessType, CacheableIdentifier, PropertyOffset, Structure*,
58          const ObjectPropertyConditionSet&, bool viaProxy, WatchpointSet* additionalSet, FunctionPtr<CustomAccessorPtrTag> customGetter,
59          JSObject* customSlotBase, Optional<DOMAttributeAnnotation>, std::unique_ptr<PolyProtoAccessChain>);
60  
61      static std::unique_ptr<AccessCase> create(VM&, JSCell* owner, AccessType, Structure*, CacheableIdentifier, PropertyOffset,
62          const ObjectPropertyConditionSet&, std::unique_ptr<PolyProtoAccessChain>, bool viaProxy = false,
63          FunctionPtr<CustomAccessorPtrTag> customSetter = nullptr, JSObject* customSlotBase = nullptr);
64  
65      void dumpImpl(PrintStream&, CommaPrinter&) const final;
66      std::unique_ptr<AccessCase> clone() const final;
67  
68      ~GetterSetterAccessCase() final;
69  
70      FunctionPtr<CustomAccessorPtrTag> customAccessor() const { return m_customAccessor; }
71  
72  private:
73      GetterSetterAccessCase(VM&, JSCell*, AccessType, CacheableIdentifier, PropertyOffset, Structure*, const ObjectPropertyConditionSet&, bool viaProxy, WatchpointSet* additionalSet, JSObject* customSlotBase, std::unique_ptr<PolyProtoAccessChain>);
74  
75      GetterSetterAccessCase(const GetterSetterAccessCase&);
76  
77      WriteBarrier<JSObject> m_customSlotBase;
78      CallLinkInfo* m_callLinkInfo { nullptr };
79      FunctionPtr<CustomAccessorPtrTag> m_customAccessor;
80      Optional<DOMAttributeAnnotation> m_domAttribute;
81  };
82  
83  } // namespace JSC
84  
85  #endif // ENABLE(JIT)