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23d66fe719
This attribute tells compilers that the pointer returned by a function is never null, which lets it optimize away null checks in some places. This seems like a nice addition to `NonnullOwnPtr` and `NonnullRefPtr`. Using this attribute causes extra UBSan checks to be emitted. To offset its performance loss, some additional methods were marked ALWAYS_INLINE, which lets the compiler optimize duplicate checks
97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#ifdef __i386__
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# define AK_ARCH_I386 1
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#endif
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#ifdef __x86_64__
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# define AK_ARCH_X86_64 1
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#endif
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#if defined(__APPLE__) && defined(__MACH__)
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# define AK_OS_MACOS
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# define AK_OS_BSD_GENERIC
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#endif
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#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
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# define AK_OS_BSD_GENERIC
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#endif
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#define ARCH(arch) (defined(AK_ARCH_##arch) && AK_ARCH_##arch)
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#ifdef ALWAYS_INLINE
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# undef ALWAYS_INLINE
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#endif
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#define ALWAYS_INLINE __attribute__((always_inline)) inline
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#ifdef NEVER_INLINE
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# undef NEVER_INLINE
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#endif
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#define NEVER_INLINE __attribute__((noinline))
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#ifdef FLATTEN
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# undef FLATTEN
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#endif
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#define FLATTEN __attribute__((flatten))
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#ifdef RETURNS_NONNULL
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# undef RETURNS_NONNULL
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#endif
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#define RETURNS_NONNULL __attribute__((returns_nonnull))
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#ifdef NO_SANITIZE_ADDRESS
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# undef NO_SANITIZE_ADDRESS
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#endif
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#define NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
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// GCC doesn't have __has_feature but clang does
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#ifndef __has_feature
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# define __has_feature(...) 0
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#endif
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#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
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# define HAS_ADDRESS_SANITIZER
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# define ASAN_POISON_MEMORY_REGION(addr, size) __asan_poison_memory_region(addr, size)
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# define ASAN_UNPOISON_MEMORY_REGION(addr, size) __asan_unpoison_memory_region(addr, size)
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#else
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# define ASAN_POISON_MEMORY_REGION(addr, size)
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# define ASAN_UNPOISON_MEMORY_REGION(addr, size)
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#endif
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#ifndef __serenity__
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# include <unistd.h>
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# undef PAGE_SIZE
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# define PAGE_SIZE sysconf(_SC_PAGESIZE)
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#endif
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ALWAYS_INLINE int count_trailing_zeroes_32(unsigned int val)
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{
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#if defined(__GNUC__) || defined(__clang__)
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return __builtin_ctz(val);
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#else
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for (u8 i = 0; i < 32; ++i) {
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if ((val >> i) & 1) {
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return i;
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}
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}
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return 0;
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#endif
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}
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ALWAYS_INLINE int count_trailing_zeroes_32_safe(unsigned int val)
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{
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if (val == 0)
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return 32;
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return count_trailing_zeroes_32(val);
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}
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#ifdef AK_OS_BSD_GENERIC
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# define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC
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# define CLOCK_REALTIME_COARSE CLOCK_REALTIME
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#endif
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