1  /*
 2   * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
 3   * Copyright (C) 2018 Apple Inc. All rights reserved.
 4   *
 5   * Redistribution and use in source and binary forms, with or without
 6   * modification, are permitted provided that the following conditions
 7   * are met:
 8   * 1. Redistributions of source code must retain the above copyright
 9   *    notice, this list of conditions and the following disclaimer.
10   * 2. Redistributions in binary form must reproduce the above copyright
11   *    notice, this list of conditions and the following disclaimer in the
12   *    documentation and/or other materials provided with the distribution.
13   *
14   * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
15   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
16   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
18   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
24   * THE POSSIBILITY OF SUCH DAMAGE.
25   */
26  
27  #pragma once
28  
29  #include "JSFunction.h"
30  
31  namespace JSC {
32  
33  class JSGlobalObject;
34  class LLIntOffsetsExtractor;
35  
36  class JSGeneratorFunction final : public JSFunction {
37      friend class JIT;
38  #if ENABLE(DFG_JIT)
39      friend class DFG::SpeculativeJIT;
40      friend class DFG::JITCompiler;
41  #endif
42      friend class VM;
43  public:
44      using Base = JSFunction;
45  
46      static constexpr unsigned StructureFlags = Base::StructureFlags;
47  
48      DECLARE_EXPORT_INFO;
49  
50      static JSGeneratorFunction* create(VM&, FunctionExecutable*, JSScope*);
51      static JSGeneratorFunction* create(VM&, FunctionExecutable*, JSScope*, Structure*);
52      static JSGeneratorFunction* createWithInvalidatedReallocationWatchpoint(VM&, FunctionExecutable*, JSScope*);
53  
54      static size_t allocationSize(Checked<size_t> inlineCapacity)
55      {
56          ASSERT_UNUSED(inlineCapacity, !inlineCapacity);
57          return sizeof(JSGeneratorFunction);
58      }
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  private:
67      JSGeneratorFunction(VM&, FunctionExecutable*, JSScope*, Structure*);
68  
69      static JSGeneratorFunction* createImpl(VM&, FunctionExecutable*, JSScope*, Structure*);
70  
71      friend class LLIntOffsetsExtractor;
72  };
73  static_assert(sizeof(JSGeneratorFunction) == sizeof(JSFunction), "Some subclasses of JSFunction should be the same size to share IsoSubspace");
74  
75  } // namespace JSC