| 1 | // Copyright (C) 2022 The Qt Company Ltd. |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | |
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| 4 | #ifndef QV4STACKLIMITS_P_H |
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| 5 | #define QV4STACKLIMITS_P_H |
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| 6 | |
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| 7 | // |
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| 8 | // W A R N I N G |
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| 9 | // ------------- |
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| 10 | // |
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| 11 | // This file is not part of the Qt API. It exists purely as an |
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| 12 | // implementation detail. This header file may change from version to |
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| 13 | // version without notice, or even be removed. |
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| 14 | // |
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| 15 | // We mean it. |
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| 16 | // |
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| 17 | |
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| 18 | #include <private/qtqmlglobal_p.h> |
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| 19 | |
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| 20 | #ifndef Q_STACK_GROWTH_DIRECTION |
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| 21 | # ifdef Q_PROCESSOR_HPPA |
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| 22 | # define Q_STACK_GROWTH_DIRECTION (1) |
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| 23 | # else |
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| 24 | # define Q_STACK_GROWTH_DIRECTION (-1) |
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| 25 | # endif |
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| 26 | #endif |
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| 27 | |
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| 28 | QT_BEGIN_NAMESPACE |
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| 29 | |
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| 30 | namespace QV4 { |
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| 31 | |
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| 32 | // Note: This does not return a completely accurate stack pointer. |
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| 33 | // Depending on whether this function is inlined or not, we may get the address of |
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| 34 | // this function's stack frame or the caller's stack frame. |
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| 35 | // Always use a safety margin when determining stack limits. |
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| 36 | inline const void *currentStackPointer() |
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| 37 | { |
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| 38 | // TODO: How often do we actually need the assembler mess below? Is that worth it? |
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| 39 | |
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| 40 | void *stackPointer; |
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| 41 | #if defined(Q_CC_GNU) || __has_builtin(__builtin_frame_address) |
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| 42 | stackPointer = __builtin_frame_address(0); |
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| 43 | #elif defined(Q_CC_MSVC) |
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| 44 | stackPointer = &stackPointer; |
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| 45 | #elif defined(Q_PROCESSOR_X86_64) |
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| 46 | __asm__ __volatile__("movq %%rsp, %0" : "=r" (stackPointer) : :); |
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| 47 | #elif defined(Q_PROCESSOR_X86) |
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| 48 | __asm__ __volatile__("movl %%esp, %0" : "=r" (stackPointer) : :); |
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| 49 | #elif defined(Q_PROCESSOR_ARM_64) && defined(__ILP32__) |
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| 50 | quint64 stackPointerRegister = 0; |
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| 51 | __asm__ __volatile__("mov %0, sp" : "=r" (stackPointerRegister) : :); |
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| 52 | stackPointer = reinterpret_cast<void *>(stackPointerRegister); |
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| 53 | #elif defined(Q_PROCESSOR_ARM_64) || defined(Q_PROCESSOR_ARM_32) |
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| 54 | __asm__ __volatile__("mov %0, sp" : "=r" (stackPointer) : :); |
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| 55 | #else |
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| 56 | stackPointer = &stackPointer; |
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| 57 | #endif |
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| 58 | return stackPointer; |
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| 59 | } |
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| 60 | |
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| 61 | struct StackProperties |
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| 62 | { |
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| 63 | const void *base = nullptr; |
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| 64 | const void *softLimit = nullptr; |
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| 65 | const void *hardLimit = nullptr; |
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| 66 | }; |
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| 67 | |
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| 68 | StackProperties stackProperties(); |
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| 69 | |
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| 70 | } // namespace QV4 |
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| 71 | |
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| 72 | QT_END_NAMESPACE |
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| 73 | |
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| 74 | #endif // QV4STACKLIMITS_P_H |
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| 75 | |
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