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/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#ifndef _NXT_CLANG_H_INCLUDED_
#define _NXT_CLANG_H_INCLUDED_
#define nxt_inline static inline __attribute__((always_inline))
#define nxt_noinline __attribute__((noinline))
#define nxt_cdecl
#if (NXT_CLANG)
/* Any __asm__ directive disables loop vectorization in GCC and Clang. */
#define \
nxt_pragma_loop_disable_vectorization \
__asm__("")
#else
#define \
nxt_pragma_loop_disable_vectorization
#endif
#if (NXT_HAVE_BUILTIN_EXPECT)
#define \
nxt_expect(c, x) \
__builtin_expect((long) (x), (c))
#define \
nxt_fast_path(x) \
nxt_expect(1, x)
#define \
nxt_slow_path(x) \
nxt_expect(0, x)
#else
#define \
nxt_expect(c, x) \
(x)
#define \
nxt_fast_path(x) \
(x)
#define \
nxt_slow_path(x) \
(x)
#endif
#if (NXT_HAVE_BUILTIN_UNREACHABLE)
#define \
nxt_unreachable() \
__builtin_unreachable()
#else
#define \
nxt_unreachable()
#endif
#if (NXT_HAVE_BUILTIN_PREFETCH)
#define \
nxt_prefetch(a) \
__builtin_prefetch(a)
#else
#define \
nxt_prefetch(a)
#endif
#if (NXT_HAVE_GCC_ATTRIBUTE_VISIBILITY)
#define NXT_EXPORT __attribute__((visibility("default")))
#else
#define NXT_EXPORT
#endif
#if (NXT_HAVE_GCC_ATTRIBUTE_MALLOC)
#define NXT_MALLOC_LIKE __attribute__((__malloc__))
#else
#define NXT_MALLOC_LIKE
#endif
#if (NXT_HAVE_GCC_ATTRIBUTE_ALIGNED)
#define nxt_aligned(x) __attribute__((aligned(x)))
#else
#define nxt_aligned(x)
#endif
#if (NXT_HAVE_GCC_ATTRIBUTE_PACKED)
#define nxt_packed __attribute__((__packed__))
#else
#define nxt_packed
#endif
#if (NXT_HAVE_GCC_ATTRIBUTE_UNUSED)
#define NXT_MAYBE_UNUSED __attribute__((__unused__))
#else
#define NXT_MAYBE_UNUSED
#endif
#if (NXT_HAVE_BUILTIN_POPCOUNT)
#define nxt_popcount __builtin_popcount
#else
nxt_inline int
nxt_popcount(unsigned int x)
{
int count;
for (count = 0; x != 0; count++) {
x &= x - 1;
}
return count;
}
#endif
#ifndef NXT_ALIGNMENT
#if (NXT_SOLARIS)
#define NXT_ALIGNMENT _POINTER_ALIGNMENT /* x86_64: 8, i386: 4 */
/* sparcv9: 8, sparcv8: 4 */
#elif (__i386__ || __i386)
#define NXT_ALIGNMENT 4
#elif (__arm__)
#define NXT_ALIGNMENT 8 /* 32-bit ARM may use 64-bit load/store */
#elif (__ia64__)
#define NXT_ALIGNMENT 8 /* long long */
#else
#define NXT_ALIGNMENT NXT_PTR_SIZE
#endif
#endif
#ifndef NXT_MAX_ALIGNMENT
#if (NXT_SOLARIS)
#define NXT_MAX_ALIGNMENT _MAX_ALIGNMENT /* x86_64: 16, i386: 4 */
/* sparcv9: 16, sparcv8: 8 */
#elif (__i386__ || __i386)
#define NXT_MAX_ALIGNMENT 4
#elif (__arm__)
#define NXT_MAX_ALIGNMENT 16
#elif (__ia64__)
#define NXT_MAX_ALIGNMENT 16
#else
#define NXT_MAX_ALIGNMENT 16
#endif
#endif
#define \
nxt_alloca(size) \
alloca(size)
#define \
nxt_container_of(p, type, field) \
(type *) ((u_char *) (p) - offsetof(type, field))
#define nxt_pointer_to(p, offset) \
((void *) ((char *) (p) + (offset)))
#define nxt_value_at(type, p, offset) \
*(type *) ((u_char *) p + offset)
#define \
nxt_nitems(x) \
(sizeof(x) / sizeof((x)[0]))
/* GCC and Clang use __builtin_abs() instead of libc abs(). */
#define \
nxt_abs(val) \
abs(val)
#define \
nxt_max(val1, val2) \
((val1 < val2) ? (val2) : (val1))
#define \
nxt_min(val1, val2) \
((val1 > val2) ? (val2) : (val1))
#define \
nxt_bswap32(val) \
( ((val) >> 24) \
| (((val) & 0x00FF0000) >> 8) \
| (((val) & 0x0000FF00) << 8) \
| ((val) << 24))
#define nxt_is_power_of_two(value) \
((((value) - 1) & (value)) == 0)
#define \
nxt_align_size(d, a) \
(((d) + ((size_t) (a) - 1)) & ~((size_t) (a) - 1))
#define \
nxt_align_ptr(p, a) \
(u_char *) (((uintptr_t) (p) + ((uintptr_t) (a) - 1)) \
& ~((uintptr_t) (a) - 1))
#define \
nxt_trunc_ptr(p, a) \
(u_char *) ((uintptr_t) (p) & ~((uintptr_t) (a) - 1))
#define nxt_length(s) \
(sizeof(s) - 1)
#endif /* _NXT_CLANG_H_INCLUDED_ */
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