244 lines
6.5 KiB
C
244 lines
6.5 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) NGINX, Inc.
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*/
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#ifndef _NXT_CLANG_H_INCLUDED_
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#define _NXT_CLANG_H_INCLUDED_
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#define nxt_inline static inline __attribute__((always_inline))
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#define nxt_noinline __attribute__((noinline))
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#define nxt_cdecl
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#if (NXT_CLANG)
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/* Any __asm__ directive disables loop vectorization in GCC and Clang. */
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#define \
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nxt_pragma_loop_disable_vectorization \
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__asm__("")
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#else
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#define \
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nxt_pragma_loop_disable_vectorization
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#endif
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#if (NXT_HAVE_BUILTIN_EXPECT)
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#define \
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nxt_expect(c, x) \
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__builtin_expect((long) (x), (c))
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#define \
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nxt_fast_path(x) \
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nxt_expect(1, x)
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#define \
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nxt_slow_path(x) \
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nxt_expect(0, x)
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#else
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#define \
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nxt_expect(c, x) \
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(x)
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#define \
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nxt_fast_path(x) \
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(x)
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#define \
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nxt_slow_path(x) \
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(x)
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#endif
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#if (NXT_HAVE_BUILTIN_UNREACHABLE)
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#define \
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nxt_unreachable() \
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__builtin_unreachable()
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#else
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#define \
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nxt_unreachable()
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#endif
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#if (NXT_HAVE_BUILTIN_PREFETCH)
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#define \
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nxt_prefetch(a) \
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__builtin_prefetch(a)
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#else
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#define \
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nxt_prefetch(a)
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#endif
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#if (NXT_HAVE_GCC_ATTRIBUTE_VISIBILITY)
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#define NXT_EXPORT __attribute__((visibility("default")))
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#else
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#define NXT_EXPORT
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#endif
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#if (NXT_HAVE_GCC_ATTRIBUTE_MALLOC)
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#define NXT_MALLOC_LIKE __attribute__((__malloc__))
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#else
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#define NXT_MALLOC_LIKE
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#endif
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#if (NXT_HAVE_GCC_ATTRIBUTE_ALIGNED)
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#define nxt_aligned(x) __attribute__((aligned(x)))
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#else
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#define nxt_aligned(x)
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#endif
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#if (NXT_HAVE_GCC_ATTRIBUTE_PACKED)
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#define nxt_packed __attribute__((__packed__))
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#else
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#define nxt_packed
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#endif
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#ifndef NXT_ALIGNMENT
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#if (NXT_SOLARIS)
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#define NXT_ALIGNMENT _POINTER_ALIGNMENT /* x86_64: 8, i386: 4 */
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/* sparcv9: 8, sparcv8: 4 */
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#elif (__i386__ || __i386)
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#define NXT_ALIGNMENT 4
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#elif (__arm__)
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#define NXT_ALIGNMENT 8 /* 32-bit ARM may use 64-bit load/store */
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#elif (__ia64__)
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#define NXT_ALIGNMENT 8 /* long long */
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#else
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#define NXT_ALIGNMENT NXT_PTR_SIZE
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#endif
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#endif
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#ifndef NXT_MAX_ALIGNMENT
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#if (NXT_SOLARIS)
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#define NXT_MAX_ALIGNMENT _MAX_ALIGNMENT /* x86_64: 16, i386: 4 */
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/* sparcv9: 16, sparcv8: 8 */
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#elif (__i386__ || __i386)
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#define NXT_MAX_ALIGNMENT 4
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#elif (__arm__)
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#define NXT_MAX_ALIGNMENT 16
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#elif (__ia64__)
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#define NXT_MAX_ALIGNMENT 16
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#else
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#define NXT_MAX_ALIGNMENT 16
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#endif
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#endif
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#define \
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nxt_alloca(size) \
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alloca(size)
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#define \
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nxt_container_of(p, type, field) \
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(type *) ((u_char *) (p) - offsetof(type, field))
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#define nxt_pointer_to(p, offset) \
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((void *) ((char *) (p) + (offset)))
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#define nxt_value_at(type, p, offset) \
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*(type *) ((u_char *) p + offset)
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#define \
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nxt_nitems(x) \
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(sizeof(x) / sizeof((x)[0]))
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/* GCC and Clang use __builtin_abs() instead of libc abs(). */
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#define \
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nxt_abs(val) \
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abs(val)
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#define \
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nxt_max(val1, val2) \
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((val1 < val2) ? (val2) : (val1))
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#define \
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nxt_min(val1, val2) \
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((val1 > val2) ? (val2) : (val1))
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#define \
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nxt_bswap32(val) \
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( ((val) >> 24) \
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| (((val) & 0x00ff0000) >> 8) \
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| (((val) & 0x0000ff00) << 8) \
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| ((val) << 24))
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#define nxt_is_power_of_two(value) \
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((((value) - 1) & (value)) == 0)
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#define \
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nxt_align_size(d, a) \
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(((d) + ((size_t) (a) - 1)) & ~((size_t) (a) - 1))
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#define \
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nxt_align_ptr(p, a) \
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(u_char *) (((uintptr_t) (p) + ((uintptr_t) (a) - 1)) \
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& ~((uintptr_t) (a) - 1))
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#define \
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nxt_trunc_ptr(p, a) \
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(u_char *) ((uintptr_t) (p) & ~((uintptr_t) (a) - 1))
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#endif /* _NXT_CLANG_H_INCLUDED_ */
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