1/*
2 * Copyright (C) 2013 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#if ENABLE(FTL_JIT)
29
30#include "FTLJITCode.h"
31
32namespace JSC { namespace FTL {
33
34// OSR entry into the FTL has a number of quirks:
35//
36// - OSR entry only happens through special OSR entry compilations. They have their
37// own CodeBlock and their own JITCode.
38//
39// - We only OSR enter in loop headers that have a null inline call frame.
40//
41// - Each OSR entry compilation allows entry through only one bytecode index.
42
43class ForOSREntryJITCode : public FTL::JITCode {
44public:
45 ForOSREntryJITCode();
46 ~ForOSREntryJITCode();
47
48 void initializeEntryBuffer(VM&, unsigned numCalleeLocals);
49 ScratchBuffer* entryBuffer() const { return m_entryBuffer; }
50
51 void setBytecodeIndex(unsigned value) { m_bytecodeIndex = value; }
52 unsigned bytecodeIndex() const { return m_bytecodeIndex; }
53
54 void countEntryFailure() { m_entryFailureCount++; }
55 unsigned entryFailureCount() const { return m_entryFailureCount; }
56
57 ForOSREntryJITCode* ftlForOSREntry();
58
59private:
60 ScratchBuffer* m_entryBuffer; // Only for OSR entry code blocks.
61 unsigned m_bytecodeIndex;
62 unsigned m_entryFailureCount;
63};
64
65} } // namespace JSC::FTL
66
67#endif // ENABLE(FTL_JIT)
68