1  /*
 2   * Copyright (C) 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  #include "APICast.h"
29  #include "ArgList.h"
30  #include <wtf/CagedUniquePtr.h>
31  #include <wtf/ForbidHeapAllocation.h>
32  #include <wtf/Noncopyable.h>
33  #include <wtf/Nonmovable.h>
34  
35  namespace JSC {
36  
37  class MarkedJSValueRefArray final : public BasicRawSentinelNode<MarkedJSValueRefArray> {
38      WTF_MAKE_NONCOPYABLE(MarkedJSValueRefArray);
39      WTF_MAKE_NONMOVABLE(MarkedJSValueRefArray);
40      WTF_FORBID_HEAP_ALLOCATION;
41  public:
42      using BufferUniquePtr = CagedUniquePtr<Gigacage::JSValue, JSValueRef>;
43      static constexpr size_t inlineCapacity = MarkedArgumentBuffer::inlineCapacity;
44  
45      JS_EXPORT_PRIVATE MarkedJSValueRefArray(JSGlobalContextRef, unsigned);
46      JS_EXPORT_PRIVATE ~MarkedJSValueRefArray();
47  
48      size_t size() const { return m_size; }
49      bool isEmpty() const { return !m_size; }
50  
51      JSValueRef& operator[](unsigned index) { return data()[index]; }
52  
53      const JSValueRef* data() const
54      {
55          return const_cast<MarkedJSValueRefArray*>(this)->data();
56      }
57  
58      JSValueRef* data()
59      {
60          if (m_buffer)
61              return m_buffer.get(m_size);
62          return m_inlineBuffer;
63      }
64  
65      void visitAggregate(SlotVisitor&);
66  
67  private:
68      unsigned m_size;
69      JSValueRef m_inlineBuffer[inlineCapacity] { };
70      BufferUniquePtr m_buffer;
71  };
72  
73  } // namespace JSC