1/*
2 * Copyright (C) 2014-2018 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 "GPRInfo.h"
29
30namespace JSC {
31
32struct EntryFrame;
33class ExecState;
34class JSObject;
35class VM;
36
37struct VMEntryRecord {
38 /*
39 * This record stored in a vmEntryTo{JavaScript,Host} allocated frame. It is allocated on the stack
40 * after callee save registers where local variables would go.
41 */
42 VM* m_vm;
43 ExecState* m_prevTopCallFrame;
44 EntryFrame* m_prevTopEntryFrame;
45 JSObject* m_callee;
46
47 JSObject* callee() const { return m_callee; }
48
49#if !ENABLE(C_LOOP) && NUMBER_OF_CALLEE_SAVES_REGISTERS > 0
50 CPURegister calleeSaveRegistersBuffer[NUMBER_OF_CALLEE_SAVES_REGISTERS];
51#elif ENABLE(C_LOOP)
52 CPURegister calleeSaveRegistersBuffer[1];
53#endif
54
55 ExecState* prevTopCallFrame() { return m_prevTopCallFrame; }
56 SUPPRESS_ASAN ExecState* unsafePrevTopCallFrame() { return m_prevTopCallFrame; }
57
58 EntryFrame* prevTopEntryFrame() { return m_prevTopEntryFrame; }
59 SUPPRESS_ASAN EntryFrame* unsafePrevTopEntryFrame() { return m_prevTopEntryFrame; }
60};
61
62extern "C" VMEntryRecord* vmEntryRecord(EntryFrame*);
63
64} // namespace JSC
65