-
Notifications
You must be signed in to change notification settings - Fork 2.2k
Expand file tree
/
Copy pathVMEntryRecord.h
More file actions
67 lines (56 loc) · 2.85 KB
/
Copy pathVMEntryRecord.h
File metadata and controls
67 lines (56 loc) · 2.85 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
/*
* Copyright (C) 2014-2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <JavaScriptCore/GPRInfo.h>
namespace JSC {
struct EntryFrame;
class CallFrame;
class JSGlobalObject;
class JSObject;
class VM;
struct VMEntryRecord {
/*
* This record stored in a vmEntryTo{JavaScript,Host} allocated frame. It is allocated on the stack
* after callee save registers where local variables would go.
*/
VM* const m_vm;
JSCell* const m_context;
// The following two fields are sometimes treated as a pair in assembly code, making usages of the second one implicit.
// To find them, look for loadpairq/storepairq of "VMEntryRecord::m_prevTopCallFrame" in *.asm files.
SUPPRESS_FORWARD_DECL_MEMBER CallFrame* const m_prevTopCallFrame;
SUPPRESS_FORWARD_DECL_MEMBER EntryFrame* const m_prevTopEntryFrame;
#if !ENABLE(C_LOOP) && NUMBER_OF_CALLEE_SAVES_REGISTERS > 0
CPURegister calleeSaveRegistersBuffer[NUMBER_OF_CALLEE_SAVES_REGISTERS];
#elif ENABLE(C_LOOP)
CPURegister calleeSaveRegistersBuffer[1];
#endif
CallFrame* prevTopCallFrame() { return m_prevTopCallFrame; }
SUPPRESS_ASAN CallFrame* unsafePrevTopCallFrame() { return m_prevTopCallFrame; }
EntryFrame* prevTopEntryFrame() { return m_prevTopEntryFrame; }
SUPPRESS_ASAN EntryFrame* unsafePrevTopEntryFrame() { return m_prevTopEntryFrame; }
};
static_assert(OBJECT_OFFSETOF(VMEntryRecord, m_prevTopEntryFrame) == OBJECT_OFFSETOF(VMEntryRecord, m_prevTopCallFrame) + sizeof(void*), "We load/store these using a pair instruction");
extern "C" VMEntryRecord* SYSV_ABI vmEntryRecord(EntryFrame*);
} // namespace JSC