1/*
2 * Copyright (C) 2012-2019 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 "UnlinkedGlobalCodeBlock.h"
29
30namespace JSC {
31
32class CachedEvalCodeBlock;
33
34class UnlinkedEvalCodeBlock final : public UnlinkedGlobalCodeBlock {
35public:
36 typedef UnlinkedGlobalCodeBlock Base;
37 static constexpr unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
38
39 template<typename CellType, SubspaceAccess mode>
40 static IsoSubspace* subspaceFor(VM& vm)
41 {
42 return vm.unlinkedEvalCodeBlockSpace<mode>();
43 }
44
45 static UnlinkedEvalCodeBlock* create(VM& vm, const ExecutableInfo& info, OptionSet<CodeGenerationMode> codeGenerationMode)
46 {
47 UnlinkedEvalCodeBlock* instance = new (NotNull, allocateCell<UnlinkedEvalCodeBlock>(vm.heap)) UnlinkedEvalCodeBlock(vm, vm.unlinkedEvalCodeBlockStructure.get(), info, codeGenerationMode);
48 instance->finishCreation(vm);
49 return instance;
50 }
51
52 static void destroy(JSCell*);
53
54 const Identifier& variable(unsigned index) { return m_variables[index]; }
55 unsigned numVariables() { return m_variables.size(); }
56 void adoptVariables(Vector<Identifier, 0, UnsafeVectorOverflow>& variables)
57 {
58 ASSERT(m_variables.isEmpty());
59 m_variables.swap(variables);
60 }
61
62 const Identifier& functionHoistingCandidate(unsigned index) { return m_functionHoistingCandidates[index]; }
63 unsigned numFunctionHoistingCandidates() { return m_functionHoistingCandidates.size(); }
64 void adoptFunctionHoistingCandidates(Vector<Identifier, 0, UnsafeVectorOverflow>&& functionHoistingCandidates)
65 {
66 ASSERT(m_functionHoistingCandidates.isEmpty());
67 m_functionHoistingCandidates = WTFMove(functionHoistingCandidates);
68 }
69private:
70 friend CachedEvalCodeBlock;
71
72 UnlinkedEvalCodeBlock(VM& vm, Structure* structure, const ExecutableInfo& info, OptionSet<CodeGenerationMode> codeGenerationMode)
73 : Base(vm, structure, EvalCode, info, codeGenerationMode)
74 {
75 }
76
77 UnlinkedEvalCodeBlock(Decoder&, const CachedEvalCodeBlock&);
78
79 Vector<Identifier, 0, UnsafeVectorOverflow> m_variables;
80 Vector<Identifier, 0, UnsafeVectorOverflow> m_functionHoistingCandidates;
81
82public:
83 static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue proto)
84 {
85 return Structure::create(vm, globalObject, proto, TypeInfo(UnlinkedEvalCodeBlockType, StructureFlags), info());
86 }
87
88 DECLARE_INFO;
89};
90
91}
92