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ladybird/AK/Platform.h

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Meta: Add license header to source files As suggested by Joshua, this commit adds the 2-clause BSD license as a comment block to the top of every source file. For the first pass, I've just added myself for simplicity. I encourage everyone to add themselves as copyright holders of any file they've added or modified in some significant way. If I've added myself in error somewhere, feel free to replace it with the appropriate copyright holder instead. Going forward, all new source files should include a license header.
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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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.
*/
AK: Add Platform.h with an ARCH() macro. You can currently use this to detect the CPU architecture like so: #if ARCH(I386) ... #elif ARCH(X86_64) ... #else ... #endif This will be helpful for separating out architecture-specific code blocks.
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#pragma once
#ifdef __i386__
AK: Use endianness flags to determine if conversion is necessary
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# define AK_ARCH_I386 1
AK: Add Platform.h with an ARCH() macro. You can currently use this to detect the CPU architecture like so: #if ARCH(I386) ... #elif ARCH(X86_64) ... #else ... #endif This will be helpful for separating out architecture-specific code blocks.
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#endif
#ifdef __x86_64__
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# define AK_ARCH_X86_64 1
AK: Add Platform.h with an ARCH() macro. You can currently use this to detect the CPU architecture like so: #if ARCH(I386) ... #elif ARCH(X86_64) ... #else ... #endif This will be helpful for separating out architecture-specific code blocks.
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#endif
AK: Add CLOCK_*_COARSE aliases for darwin and BSD variants The coarse clocks in time.h are a linux extension that we've adopted. MacOS and the BSDs don't have it, so we need an alias in a platform header for Lagom builds.
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#if defined(__APPLE__) && defined(__MACH__)
# define AK_OS_MACOS
# define AK_OS_BSD_GENERIC
#endif
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
# define AK_OS_BSD_GENERIC
#endif
AK: Add Platform.h with an ARCH() macro. You can currently use this to detect the CPU architecture like so: #if ARCH(I386) ... #elif ARCH(X86_64) ... #else ... #endif This will be helpful for separating out architecture-specific code blocks.
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#define ARCH(arch) (defined(AK_ARCH_##arch) && AK_ARCH_##arch)
AK: Add ALWAYS_INLINE, NEVER_INLINE and FLATTEN macros It's tedious to write (and look at) [[gnu::always_inline]] etc. :^)
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#ifdef ALWAYS_INLINE
AK: Add Endian.h header to replace NetworkOrdered.h.
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# undef ALWAYS_INLINE
AK: Add ALWAYS_INLINE, NEVER_INLINE and FLATTEN macros It's tedious to write (and look at) [[gnu::always_inline]] etc. :^)
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#endif
#define ALWAYS_INLINE [[gnu::always_inline]] inline
#ifdef NEVER_INLINE
AK: Add Endian.h header to replace NetworkOrdered.h.
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# undef NEVER_INLINE
AK: Add ALWAYS_INLINE, NEVER_INLINE and FLATTEN macros It's tedious to write (and look at) [[gnu::always_inline]] etc. :^)
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#endif
#define NEVER_INLINE [[gnu::noinline]]
#ifdef FLATTEN
AK: Add Endian.h header to replace NetworkOrdered.h.
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# undef FLATTEN
AK: Add ALWAYS_INLINE, NEVER_INLINE and FLATTEN macros It's tedious to write (and look at) [[gnu::always_inline]] etc. :^)
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#endif
#define FLATTEN [[gnu::flatten]]
AK: Allow NonnullRefPtr::ptr() when in "unknown" typestate. Clang loses the typestate when passing NonnullRefPtr's via lambda captures. This is unfortunate, but not much we can do about it. Allowing ptr() makes it possible to use captured NonnullRefPtrs as you'd expect.
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#ifndef __serenity__
Everywhere: Remove klog(), dbg() and purge all LogStream usage :^) Good-bye LogStream. Long live AK::Format!
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# include <unistd.h>
AK: Use endianness flags to determine if conversion is necessary
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# define PAGE_SIZE sysconf(_SC_PAGESIZE)
AK: Allow NonnullRefPtr::ptr() when in "unknown" typestate. Clang loses the typestate when passing NonnullRefPtr's via lambda captures. This is unfortunate, but not much we can do about it. Allowing ptr() makes it possible to use captured NonnullRefPtrs as you'd expect.
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#endif
AK: Shim open_with_path_length() for non-Serenity builds. This is pretty ugly but I don't want to *not* use open_with_path_length() so let's just shim it.
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AK: Add ALWAYS_INLINE, NEVER_INLINE and FLATTEN macros It's tedious to write (and look at) [[gnu::always_inline]] etc. :^)
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ALWAYS_INLINE int count_trailing_zeroes_32(unsigned int val)
AK: Add count_trailing_zeroes_32() Add count_trailing_zeroes_32() which is implemented with builtins if available, otherwise there's a generic fallback.
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{
#if defined(__GNUC__) || defined(__clang__)
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return __builtin_ctz(val);
AK: Add count_trailing_zeroes_32() Add count_trailing_zeroes_32() which is implemented with builtins if available, otherwise there's a generic fallback.
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#else
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for (u8 i = 0; i < 32; ++i) {
if ((val >> i) & 1) {
return i;
AK: Add count_trailing_zeroes_32() Add count_trailing_zeroes_32() which is implemented with builtins if available, otherwise there's a generic fallback.
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}
AK: Add Endian.h header to replace NetworkOrdered.h.
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}
return 0;
AK: Add count_trailing_zeroes_32() Add count_trailing_zeroes_32() which is implemented with builtins if available, otherwise there's a generic fallback.
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#endif
LibGfx: Fix dynamic bitmasks in BMPs I overlooked a corner case where we might call the built-in ctz() on zero. Furthermore, the calculation of the shift was wrong and the results were often unusable. Both issue were caused by a forgotten 36daeee34ff04f64c933e94a9cdffe9080061fb0. This time I made sure to look at bmpsuite_files first, and now they look good. Found by OSS-Fuzz: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28985
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}
ALWAYS_INLINE int count_trailing_zeroes_32_safe(unsigned int val)
{
if (val == 0)
return 32;
return count_trailing_zeroes_32(val);
}
AK: Add CLOCK_*_COARSE aliases for darwin and BSD variants The coarse clocks in time.h are a linux extension that we've adopted. MacOS and the BSDs don't have it, so we need an alias in a platform header for Lagom builds.
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#ifdef AK_OS_BSD_GENERIC
# define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC
# define CLOCK_REALTIME_COARSE CLOCK_REALTIME
#endif
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