952bcc50bf
We had a mix of styles for declaring function-like macros:
Style A:
#define \
foo() \
do { \
... \
} while (0)
Style B:
#define foo() \
do { \
... \
} while (0)
We had a similar number of occurences of each style:
$ grep -rnI '^\w*(.*\\' | wc -l
244
$ grep -rn 'define.*(.*)' | wc -l
239
(Those regexes aren't perfect, but a very decent approximation.)
Real examples:
$ find src -type f | xargs sed -n '/^nxt_double_is_zero/,/^$/p'
nxt_double_is_zero(f) \
(fabs(f) <= FLT_EPSILON)
$ find src -type f | xargs sed -n '/define nxt_http_field_set/,/^$/p'
#define nxt_http_field_set(_field, _name, _value) \
do { \
(_field)->name_length = nxt_length(_name); \
(_field)->value_length = nxt_length(_value); \
(_field)->name = (u_char *) _name; \
(_field)->value = (u_char *) _value; \
} while (0)
I'd like to standardize on a single style for them, and IMO,
having the identifier in the same line as #define is a better
option for the following reasons:
- Programmers are used to `#define foo() ...` (readability).
- One less line of code.
- The program for finding them is really simple (see below).
function grep_ngx_func()
{
if (($# != 1)); then
>&2 echo "Usage: ${FUNCNAME[0]} <func>";
return 1;
fi;
find src -type f \
| grep '\.[ch]$' \
| xargs grep -l "$1" \
| sort \
| xargs pcregrep -Mn "(?s)^\$[\w\s*]+?^$1\(.*?^}";
find src -type f \
| grep '\.[ch]$' \
| xargs grep -l "$1" \
| sort \
| xargs pcregrep -Mn "(?s)define $1\(.*?^$" \
| sed -E '1s/^[^:]+:[0-9]+:/&\n\n/';
}
$ grep_ngx_func
Usage: grep_ngx_func <func>
$ grep_ngx_func nxt_http_field_set
src/nxt_http.h:98:
#define nxt_http_field_set(_field, _name, _value) \
do { \
(_field)->name_length = nxt_length(_name); \
(_field)->value_length = nxt_length(_value); \
(_field)->name = (u_char *) _name; \
(_field)->value = (u_char *) _value; \
} while (0)
$ grep_ngx_func nxt_sprintf
src/nxt_sprintf.c:56:
u_char * nxt_cdecl
nxt_sprintf(u_char *buf, u_char *end, const char *fmt, ...)
{
u_char *p;
va_list args;
va_start(args, fmt);
p = nxt_vsprintf(buf, end, fmt, args);
va_end(args);
return p;
}
................
Scripted change:
................
$ find src -type f \
| grep '\.[ch]$' \
| xargs sed -i '/define *\\$/{N;s/ *\\\n/ /;s/ //}'
259 lines
5.3 KiB
C
259 lines
5.3 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 nxt_pragma_loop_disable_vectorization \
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__asm__("")
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#else
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#define nxt_pragma_loop_disable_vectorization
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#endif
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#if (NXT_HAVE_BUILTIN_EXPECT)
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#define nxt_expect(c, x) \
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__builtin_expect((long) (x), (c))
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#define nxt_fast_path(x) \
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nxt_expect(1, x)
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#define nxt_slow_path(x) \
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nxt_expect(0, x)
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#else
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#define nxt_expect(c, x) \
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(x)
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#define nxt_fast_path(x) \
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(x)
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#define 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 nxt_unreachable() \
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__builtin_unreachable()
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#else
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#define nxt_unreachable()
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#endif
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#if (NXT_HAVE_BUILTIN_PREFETCH)
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#define nxt_prefetch(a) \
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__builtin_prefetch(a)
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#else
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#define 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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#if (NXT_HAVE_GCC_ATTRIBUTE_UNUSED)
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#define NXT_MAYBE_UNUSED __attribute__((__unused__))
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#else
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#define NXT_MAYBE_UNUSED
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#endif
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#if (NXT_HAVE_BUILTIN_POPCOUNT)
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#define nxt_popcount __builtin_popcount
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#else
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nxt_inline int
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nxt_popcount(unsigned int x)
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{
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int count;
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for (count = 0; x != 0; count++) {
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x &= x - 1;
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}
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return count;
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}
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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 nxt_alloca(size) \
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alloca(size)
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#define 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 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 nxt_abs(val) \
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abs(val)
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#define nxt_max(val1, val2) \
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((val1 < val2) ? (val2) : (val1))
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#define nxt_min(val1, val2) \
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((val1 > val2) ? (val2) : (val1))
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#define 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 nxt_align_size(d, a) \
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(((d) + ((size_t) (a) - 1)) & ~((size_t) (a) - 1))
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#define 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 nxt_trunc_ptr(p, a) \
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(u_char *) ((uintptr_t) (p) & ~((uintptr_t) (a) - 1))
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#define nxt_length(s) \
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(sizeof(s) - 1)
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#endif /* _NXT_CLANG_H_INCLUDED_ */
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