diff options
Diffstat (limited to 'src/prelude.h')
| -rw-r--r-- | src/prelude.h | 197 |
1 files changed, 3 insertions, 194 deletions
diff --git a/src/prelude.h b/src/prelude.h index 7df178c..5f7203e 100644 --- a/src/prelude.h +++ b/src/prelude.h @@ -8,20 +8,11 @@ #ifndef BFS_PRELUDE_H #define BFS_PRELUDE_H -// Possible __STDC_VERSION__ values - -#define C95 199409L -#define C99 199901L -#define C11 201112L -#define C17 201710L -#define C23 202311L - -// Get the static_assert() definition as well as __GLIBC__ -#include <assert.h> - // Get the convenience macros that became standard spellings in C23 -#if __STDC_VERSION__ < C23 +#if __STDC_VERSION__ < 202311L +/** _Static_assert() => static_assert() */ +#include <assert.h> /** _Alignas(), _Alignof() => alignas(), alignof() */ #include <stdalign.h> /** _Bool => bool, true, false */ @@ -38,28 +29,6 @@ #endif // !C23 -// bfs packaging configuration - -#include "config.h" - -#ifndef BFS_COMMAND -# define BFS_COMMAND "bfs" -#endif -#ifndef BFS_HOMEPAGE -# define BFS_HOMEPAGE "https://tavianator.com/projects/bfs.html" -#endif - -// This is a symbol instead of a literal so we don't have to rebuild everything -// when the version number changes -extern const char bfs_version[]; - -extern const char bfs_confflags[]; -extern const char bfs_cc[]; -extern const char bfs_cppflags[]; -extern const char bfs_cflags[]; -extern const char bfs_ldflags[]; -extern const char bfs_ldlibs[]; - // Feature detection // https://clang.llvm.org/docs/LanguageExtensions.html#has-attribute @@ -99,164 +68,4 @@ extern const char bfs_ldlibs[]; # define __SANITIZE_THREAD__ true #endif -// Fundamental utilities - -/** - * Get the length of an array. - */ -#define countof(...) (sizeof(__VA_ARGS__) / sizeof(0[__VA_ARGS__])) - -/** - * False sharing/destructive interference/largest cache line size. - */ -#ifdef __GCC_DESTRUCTIVE_SIZE -# define FALSE_SHARING_SIZE __GCC_DESTRUCTIVE_SIZE -#else -# define FALSE_SHARING_SIZE 64 -#endif - -/** - * True sharing/constructive interference/smallest cache line size. - */ -#ifdef __GCC_CONSTRUCTIVE_SIZE -# define TRUE_SHARING_SIZE __GCC_CONSTRUCTIVE_SIZE -#else -# define TRUE_SHARING_SIZE 64 -#endif - -/** - * Alignment specifier that avoids false sharing. - */ -#define cache_align alignas(FALSE_SHARING_SIZE) - -// Wrappers for attributes - -/** - * Silence warnings about switch/case fall-throughs. - */ -#if __has_attribute(fallthrough) -# define _fallthrough __attribute__((fallthrough)) -#else -# define _fallthrough ((void)0) -#endif - -/** - * Silence warnings about unused declarations. - */ -#if __has_attribute(unused) -# define _maybe_unused __attribute__((unused)) -#else -# define _maybe_unused -#endif - -/** - * Warn if a value is unused. - */ -#if __has_attribute(warn_unused_result) -# define _nodiscard __attribute__((warn_unused_result)) -#else -# define _nodiscard -#endif - -/** - * Hint to avoid inlining a function. - */ -#if __has_attribute(noinline) -# define _noinline __attribute__((noinline)) -#else -# define _noinline -#endif - -/** - * Marks a non-returning function. - */ -#if __STDC_VERSION__ >= C23 -# define _noreturn [[noreturn]] -#else -# define _noreturn _Noreturn -#endif - -/** - * Hint that a function is unlikely to be called. - */ -#if __has_attribute(cold) -# define _cold _noinline __attribute__((cold)) -#else -# define _cold _noinline -#endif - -/** - * Adds compiler warnings for bad printf()-style function calls, if supported. - */ -#if __has_attribute(format) -# define _printf(fmt, args) __attribute__((format(printf, fmt, args))) -#else -# define _printf(fmt, args) -#endif - -/** - * Annotates functions that potentially modify and return format strings. - */ -#if __has_attribute(format_arg) -# define _format_arg(arg) __attribute__((format_arg(arg))) -#else -# define _format_arg(arg) -#endif - -/** - * Annotates allocator-like functions. - */ -#if __has_attribute(malloc) -# if __GNUC__ >= 11 && !__OPTIMIZE__ // malloc(deallocator) disables inlining on GCC -# define _malloc(...) _nodiscard __attribute__((malloc(__VA_ARGS__))) -# else -# define _malloc(...) _nodiscard __attribute__((malloc)) -# endif -#else -# define _malloc(...) _nodiscard -#endif - -/** - * Specifies that a function returns allocations with a given alignment. - */ -#if __has_attribute(alloc_align) -# define _alloc_align(param) __attribute__((alloc_align(param))) -#else -# define _alloc_align(param) -#endif - -/** - * Specifies that a function returns allocations with a given size. - */ -#if __has_attribute(alloc_size) -# define _alloc_size(...) __attribute__((alloc_size(__VA_ARGS__))) -#else -# define _alloc_size(...) -#endif - -/** - * Shorthand for _alloc_align() and _alloc_size(). - */ -#define _aligned_alloc(align, ...) _alloc_align(align) _alloc_size(__VA_ARGS__) - -/** - * Check if function multiversioning via GNU indirect functions (ifunc) is supported. - * - * Disabled on TSan due to https://github.com/google/sanitizers/issues/342. - */ -#ifndef BFS_USE_TARGET_CLONES -# if __has_attribute(target_clones) && (__GLIBC__ || __FreeBSD__) && !__SANITIZE_THREAD__ -# define BFS_USE_TARGET_CLONES true -# endif -#endif - -/** - * Apply the target_clones attribute, if available. - */ -#if BFS_USE_TARGET_CLONES -# define _target_clones(...) __attribute__((target_clones(__VA_ARGS__))) -#else -# define _target_clones(...) -#endif - #endif // BFS_PRELUDE_H |