blob: 9e7fdb279b570d765b4682ee27f9d861e01e95ee (
plain)
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
68
69
70
71
72
73
74
|
// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QV4STACKLIMITS_P_H
#define QV4STACKLIMITS_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <private/qtqmlglobal_p.h>
#ifndef Q_STACK_GROWTH_DIRECTION
# ifdef Q_PROCESSOR_HPPA
# define Q_STACK_GROWTH_DIRECTION (1)
# else
# define Q_STACK_GROWTH_DIRECTION (-1)
# endif
#endif
QT_BEGIN_NAMESPACE
namespace QV4 {
// Note: This does not return a completely accurate stack pointer.
// Depending on whether this function is inlined or not, we may get the address of
// this function's stack frame or the caller's stack frame.
// Always use a safety margin when determining stack limits.
inline const void *currentStackPointer()
{
// TODO: How often do we actually need the assembler mess below? Is that worth it?
void *stackPointer;
#if defined(Q_CC_GNU) || __has_builtin(__builtin_frame_address)
stackPointer = __builtin_frame_address(0);
#elif defined(Q_CC_MSVC)
stackPointer = &stackPointer;
#elif defined(Q_PROCESSOR_X86_64)
__asm__ __volatile__("movq %%rsp, %0" : "=r"(stackPointer) : :);
#elif defined(Q_PROCESSOR_X86)
__asm__ __volatile__("movl %%esp, %0" : "=r"(stackPointer) : :);
#elif defined(Q_PROCESSOR_ARM_64) && defined(__ILP32__)
quint64 stackPointerRegister = 0;
__asm__ __volatile__("mov %0, sp" : "=r"(stackPointerRegister) : :);
stackPointer = reinterpret_cast<void *>(stackPointerRegister);
#elif defined(Q_PROCESSOR_ARM_64) || defined(Q_PROCESSOR_ARM_32)
__asm__ __volatile__("mov %0, sp" : "=r"(stackPointer) : :);
#else
stackPointer = &stackPointer;
#endif
return stackPointer;
}
struct StackProperties
{
const void *base = nullptr;
const void *softLimit = nullptr;
const void *hardLimit = nullptr;
};
StackProperties stackProperties();
} // namespace QV4
QT_END_NAMESPACE
#endif // QV4STACKLIMITS_P_H
|
