1  /*
 2   * Copyright (C) 2009-2019 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 "ExecutableBase.h"
29  
30  namespace JSC {
31  
32  class NativeExecutable final : public ExecutableBase {
33      friend class JIT;
34      friend class LLIntOffsetsExtractor;
35  public:
36      typedef ExecutableBase Base;
37      static constexpr unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
38  
39      static NativeExecutable* create(VM&, Ref<JITCode>&& callThunk, TaggedNativeFunction, Ref<JITCode>&& constructThunk, TaggedNativeFunction constructor, const String& name);
40  
41      static void destroy(JSCell*);
42      
43      template<typename CellType, SubspaceAccess>
44      static IsoSubspace* subspaceFor(VM& vm)
45      {
46          return &vm.nativeExecutableSpace;
47      }
48  
49      CodeBlockHash hashFor(CodeSpecializationKind) const;
50  
51      TaggedNativeFunction function() const { return m_function; }
52      TaggedNativeFunction constructor() const { return m_constructor; }
53          
54      TaggedNativeFunction nativeFunctionFor(CodeSpecializationKind kind)
55      {
56          if (kind == CodeForCall)
57              return function();
58          ASSERT(kind == CodeForConstruct);
59          return constructor();
60      }
61          
62      static ptrdiff_t offsetOfNativeFunctionFor(CodeSpecializationKind kind)
63      {
64          if (kind == CodeForCall)
65              return OBJECT_OFFSETOF(NativeExecutable, m_function);
66          ASSERT(kind == CodeForConstruct);
67          return OBJECT_OFFSETOF(NativeExecutable, m_constructor);
68      }
69  
70      static Structure* createStructure(VM&, JSGlobalObject*, JSValue proto);
71          
72      DECLARE_INFO;
73  
74      const String& name() const { return m_name; }
75  
76      const DOMJIT::Signature* signatureFor(CodeSpecializationKind) const;
77      Intrinsic intrinsic() const;
78  
79  private:
80      NativeExecutable(VM&, TaggedNativeFunction, TaggedNativeFunction constructor);
81      void finishCreation(VM&, Ref<JITCode>&& callThunk, Ref<JITCode>&& constructThunk, const String& name);
82  
83      TaggedNativeFunction m_function;
84      TaggedNativeFunction m_constructor;
85  
86      String m_name;
87  };
88  
89  } // namespace JSC