1/*
2 * Copyright (C) 2018-2019 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 "ConcurrentJSLock.h"
29#include "IsoSubspace.h"
30#include "JSCast.h"
31#include "VM.h"
32
33namespace JSC {
34
35class CodeBlock;
36class LLIntOffsetsExtractor;
37
38class ExecutableToCodeBlockEdge final : public JSCell {
39public:
40 typedef JSCell Base;
41 static constexpr unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
42
43 template<typename CellType, SubspaceAccess>
44 static IsoSubspace* subspaceFor(VM& vm)
45 {
46 return &vm.executableToCodeBlockEdgeSpace;
47 }
48
49 static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
50
51 static ExecutableToCodeBlockEdge* create(VM&, CodeBlock*);
52
53 DECLARE_INFO;
54
55 CodeBlock* codeBlock() const { return m_codeBlock.get(); }
56
57 static void visitChildren(JSCell*, SlotVisitor&);
58 static void visitOutputConstraints(JSCell*, SlotVisitor&);
59 void finalizeUnconditionally(VM&);
60
61 static CodeBlock* unwrap(ExecutableToCodeBlockEdge* edge)
62 {
63 if (!edge)
64 return nullptr;
65 return edge->codeBlock();
66 }
67
68 static CodeBlock* deactivateAndUnwrap(ExecutableToCodeBlockEdge* edge);
69
70 static ExecutableToCodeBlockEdge* wrap(CodeBlock* codeBlock);
71
72 static ExecutableToCodeBlockEdge* wrapAndActivate(CodeBlock* codeBlock);
73
74private:
75 friend class LLIntOffsetsExtractor;
76
77 ExecutableToCodeBlockEdge(VM&, CodeBlock*);
78
79 void finishCreation(VM&);
80
81 void activate();
82 void deactivate();
83 bool isActive() const;
84
85 void runConstraint(const ConcurrentJSLocker&, VM&, SlotVisitor&);
86
87 WriteBarrier<CodeBlock> m_codeBlock;
88};
89
90} // namespace JSC
91
92