util: refactor misc utility stuff
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623daf58ed
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/* See the end of this file for copyright and license terms. */
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#pragma once
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#include <gay/cdefs.h>
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/**
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* @brief Get the number of elements in a statically allocated array.
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*
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* @param a The array
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* @returns The number of elements
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*/
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#define ARRAY_SIZE(a) ( sizeof(a) / sizeof(a[0]) )
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#define abs(x) ({ \
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typeof(x) __x = (x); \
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__x < 0 ? -__x : __x; \
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})
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#define max(a, b) ({ \
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typeof(a) __a = (a); \
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typeof(b) __b = (b); \
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__a > __b ? __a : __b; \
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})
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#define min(a, b) ({ \
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typeof(a) __a = (a); \
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typeof(b) __b = (b); \
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__a < __b ? __a : __b; \
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})
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/**
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* @brief Cast a pointer to a struct member out to the containing structure.
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*
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* @param ptr Pointer to the struct member
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* @param type Type of the containing structure
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* @param member Name of the member within the containing structure
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* @returns Pointer to the containing structure
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*/
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#define container_of(ptr, type, member) \
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((type *)( (void *)(ptr) - offsetof(type, member) ))
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/**
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* @brief Do an evil raw cast.
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*
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* @param type Type to cast to
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* @param expr Expression to cast
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* @returns The raw value of `expr`, cast to `type`
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*/
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#define raw_cast(type, expr) ({ \
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typeof(expr) __expr = (expr); \
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*(type *)&__expr; \
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})
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/**
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* @brief Align `ptr` such that `ptr % n == 0`.
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*
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* @param ptr Pointer to align
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* @param log The log2 of the alignment. If negative, the pointer will be
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* aligned to the next lower address, otherwise to the next higher one.
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* @returns The aligned pointer
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*/
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void *ptr_align(void *ptr, int log);
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/*
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* This file is part of GayBSD.
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* Copyright (c) 2021 fef <owo@fef.moe>.
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*
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* GayBSD is nonviolent software: you may only use, redistribute, and/or
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* modify it under the terms of the Cooperative Nonviolent Public License
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* (CNPL) as found in the LICENSE file in the source code root directory
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* or at <https://git.pixie.town/thufie/npl-builder>; either version 7
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* of the license, or (at your option) any later version.
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*
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* GayBSD comes with ABSOLUTELY NO WARRANTY, to the extent
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* permitted by applicable law. See the CNPL for details.
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*/
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@ -1,18 +1,18 @@
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/* See the end of this file for copyright and license terms. */
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#pragma once
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#include <gay/types.h>
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#include <gay/util.h>
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#ifndef __clang__
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#error "Unsupported compiler, please use clang"
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#endif
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void *ptr_align(void *ptr, int log)
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{
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uintptr_t shifted = 1 << abs(log);
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uintptr_t aligned = (uintptr_t)ptr & ~(shifted - 1);
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#ifdef __cplusplus
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#define __restrict
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#else
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#define __restrict restrict
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#endif
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if (log > 0 && aligned != (uintptr_t)ptr)
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aligned += shifted;
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#define __section(name) __attribute__(( section(#name) ))
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return (void *)aligned;
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}
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/*
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* This file is part of GayBSD.
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