1  /*
 2   * Copyright (C) 2008-2019 Apple Inc. All rights reserved.
 3   * Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
 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   *
 9   * 1.  Redistributions of source code must retain the above copyright
10   *     notice, this list of conditions and the following disclaimer.
11   * 2.  Redistributions in binary form must reproduce the above copyright
12   *     notice, this list of conditions and the following disclaimer in the
13   *     documentation and/or other materials provided with the distribution.
14   * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
15   *     its contributors may be used to endorse or promote products derived
16   *     from this software without specific prior written permission.
17   *
18   * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
19   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21   * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
22   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28   */
29  
30  #pragma once
31  
32  #include "GlobalCodeBlock.h"
33  
34  namespace JSC {
35  
36  class EvalCodeBlock final : public GlobalCodeBlock {
37  public:
38      typedef GlobalCodeBlock Base;
39      DECLARE_INFO;
40  
41      template<typename, SubspaceAccess>
42      static IsoSubspace* subspaceFor(VM& vm)
43      {
44          return &vm.codeBlockSpace.space;
45      }
46  
47      static EvalCodeBlock* create(VM& vm, CopyParsedBlockTag, EvalCodeBlock& other)
48      {
49          EvalCodeBlock* instance = new (NotNull, allocateCell<EvalCodeBlock>(vm.heap))
50              EvalCodeBlock(vm, vm.evalCodeBlockStructure.get(), CopyParsedBlock, other);
51          instance->finishCreation(vm, CopyParsedBlock, other);
52          return instance;
53      }
54  
55      static EvalCodeBlock* create(VM& vm, EvalExecutable* ownerExecutable, UnlinkedEvalCodeBlock* unlinkedCodeBlock, JSScope* scope)
56      {
57          EvalCodeBlock* instance = new (NotNull, allocateCell<EvalCodeBlock>(vm.heap))
58              EvalCodeBlock(vm, vm.evalCodeBlockStructure.get(), ownerExecutable, unlinkedCodeBlock, scope);
59          if (!instance->finishCreation(vm, ownerExecutable, unlinkedCodeBlock, scope))
60              return nullptr;
61          return instance;
62      }
63  
64      static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
65      {
66          return Structure::create(vm, globalObject, prototype, TypeInfo(CodeBlockType, StructureFlags), info());
67      }
68  
69      UnlinkedEvalCodeBlock* unlinkedEvalCodeBlock() const { return jsCast<UnlinkedEvalCodeBlock*>(unlinkedCodeBlock()); }
70  
71  private:
72      EvalCodeBlock(VM& vm, Structure* structure, CopyParsedBlockTag, EvalCodeBlock& other)
73          : GlobalCodeBlock(vm, structure, CopyParsedBlock, other)
74      {
75      }
76          
77      EvalCodeBlock(VM& vm, Structure* structure, EvalExecutable* ownerExecutable, UnlinkedEvalCodeBlock* unlinkedCodeBlock, JSScope* scope)
78          : GlobalCodeBlock(vm, structure, ownerExecutable, unlinkedCodeBlock, scope)
79      {
80      }
81  };
82  static_assert(sizeof(EvalCodeBlock) == sizeof(CodeBlock), "Subclasses of CodeBlock should be the same size to share IsoSubspace");
83  
84  } // namespace JSC