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64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Assertions.h>
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#include <AK/Platform.h>
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#include <AK/StackInfo.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef __serenity__
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# include <serenity.h>
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#elif defined(__linux__) or defined(AK_OS_MACOS)
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# include <pthread.h>
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#endif
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namespace AK {
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StackInfo::StackInfo()
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{
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#ifdef __serenity__
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if (get_stack_bounds(&m_base, &m_size) < 0) {
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perror("get_stack_bounds");
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VERIFY_NOT_REACHED();
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}
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#elif defined(__linux__)
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int rc;
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pthread_attr_t attr = {};
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if ((rc = pthread_getattr_np(pthread_self(), &attr)) != 0) {
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fprintf(stderr, "pthread_getattr_np: %s\n", strerror(rc));
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VERIFY_NOT_REACHED();
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}
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if ((rc = pthread_attr_getstack(&attr, (void**)&m_base, &m_size)) != 0) {
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fprintf(stderr, "pthread_attr_getstack: %s\n", strerror(rc));
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VERIFY_NOT_REACHED();
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}
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pthread_attr_destroy(&attr);
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#elif defined(AK_OS_MACOS)
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// NOTE: !! On MacOS, pthread_get_stackaddr_np gives the TOP of the stack, not the bottom!
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FlatPtr top_of_stack = (FlatPtr)pthread_get_stackaddr_np(pthread_self());
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m_size = (size_t)pthread_get_stacksize_np(pthread_self());
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// https://github.com/rust-lang/rust/issues/43347#issuecomment-316783599
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// https://developer.apple.com/library/archive/qa/qa1419/_index.html
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//
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// MacOS seems inconsistent on what stack size is given for the main thread.
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// According to the Apple docs, default for main thread is 8MB, and default for
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// other threads is 512KB
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constexpr size_t eight_megabytes = 0x800000;
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if (pthread_main_np() == 1 && m_size < eight_megabytes) {
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// Assume no one messed with stack size linker options for the main thread,
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// and just set it to 8MB.
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m_size = eight_megabytes;
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}
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m_base = top_of_stack - m_size;
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#else
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VERIFY_NOT_REACHED();
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#endif
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m_top = m_base + m_size;
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}
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}
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