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 "CodeBlock.h"
33  #include "UnlinkedFunctionCodeBlock.h"
34  
35  namespace JSC {
36  
37  class FunctionCodeBlock final : public CodeBlock {
38  public:
39      typedef CodeBlock Base;
40      DECLARE_INFO;
41  
42      template<typename, SubspaceAccess>
43      static IsoSubspace* subspaceFor(VM& vm)
44      {
45          return &vm.codeBlockSpace.space;
46      }
47  
48      static FunctionCodeBlock* create(VM& vm, CopyParsedBlockTag, FunctionCodeBlock& other)
49      {
50          FunctionCodeBlock* instance = new (NotNull, allocateCell<FunctionCodeBlock>(vm.heap))
51              FunctionCodeBlock(vm, vm.functionCodeBlockStructure.get(), CopyParsedBlock, other);
52          instance->finishCreation(vm, CopyParsedBlock, other);
53          return instance;
54      }
55  
56      static FunctionCodeBlock* create(VM& vm, FunctionExecutable* ownerExecutable, UnlinkedFunctionCodeBlock* unlinkedCodeBlock, JSScope* scope)
57      {
58          FunctionCodeBlock* instance = new (NotNull, allocateCell<FunctionCodeBlock>(vm.heap))
59              FunctionCodeBlock(vm, vm.functionCodeBlockStructure.get(), ownerExecutable, unlinkedCodeBlock, scope);
60          if (!instance->finishCreation(vm, ownerExecutable, unlinkedCodeBlock, scope))
61              return nullptr;
62          return instance;
63      }
64  
65      static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
66      {
67          return Structure::create(vm, globalObject, prototype, TypeInfo(CodeBlockType, StructureFlags), info());
68      }
69  
70  private:
71      FunctionCodeBlock(VM& vm, Structure* structure, CopyParsedBlockTag, FunctionCodeBlock& other)
72          : CodeBlock(vm, structure, CopyParsedBlock, other)
73      {
74      }
75  
76      FunctionCodeBlock(VM& vm, Structure* structure, FunctionExecutable* ownerExecutable, UnlinkedFunctionCodeBlock* unlinkedCodeBlock, JSScope* scope)
77          : CodeBlock(vm, structure, ownerExecutable, unlinkedCodeBlock, scope)
78      {
79      }
80  };
81  static_assert(sizeof(FunctionCodeBlock) == sizeof(CodeBlock), "Subclasses of CodeBlock should be the same size to share IsoSubspace");
82  
83  } // namespace JSC