2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus
18 Permission is hereby granted, free of charge, to any person obtaining
19 a copy of this software and associated documentation files (the
20 "Software"), to deal in the Software without restriction, including
21 without limitation the rights to use, copy, modify, merge, publish,
22 distribute, sublicense, and/or sell copies of the Software, and to
23 permit persons to whom the Software is furnished to do so, subject to
24 the following conditions:
26 The above copyright notice and this permission notice shall be
27 included in all copies or substantial portions of the Software.
29 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
33 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
34 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
35 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
38 #ifndef included_clib_h
39 #define included_clib_h
41 /* Standalone means to not assume we are running on a Unix box. */
42 #if ! defined (CLIB_STANDALONE) && ! defined (CLIB_LINUX_KERNEL)
46 #include <vppinfra/types.h>
48 /* Global DEBUG flag. Setting this to 1 or 0 turns off
49 ASSERT (see vppinfra/error.h) & other debugging code. */
55 #define NULL ((void *) 0)
58 #define BITS(x) (8*sizeof(x))
59 #define ARRAY_LEN(x) (sizeof (x)/sizeof (x[0]))
61 #define _STRUCT_FIELD(t,f) (((t *) 0)->f)
62 #define STRUCT_OFFSET_OF(t,f) ((uword) & _STRUCT_FIELD (t, f))
63 #define STRUCT_BIT_OFFSET_OF(t,f) (BITS(u8) * (uword) & _STRUCT_FIELD (t, f))
64 #define STRUCT_SIZE_OF(t,f) (sizeof (_STRUCT_FIELD (t, f)))
65 #define STRUCT_BITS_OF(t,f) (BITS (_STRUCT_FIELD (t, f)))
66 #define STRUCT_ARRAY_LEN(t,f) ARRAY_LEN (_STRUCT_FIELD (t, f))
67 #define STRUCT_MARK(mark) u8 mark[0]
68 #define STRUCT_MARK_PTR(v, f) &(v)->f
70 /* Stride in bytes between struct array elements. */
71 #define STRUCT_STRIDE_OF(t,f) \
72 ( ((uword) & (((t *) 0)[1].f)) \
73 - ((uword) & (((t *) 0)[0].f)))
75 #define STRUCT_OFFSET_OF_VAR(v,f) ((uword) (&(v)->f) - (uword) (v))
77 /* Used to pack structure elements. */
78 #define CLIB_PACKED(x) x __attribute__ ((packed))
79 #define CLIB_UNUSED(x) x __attribute__ ((unused))
81 /* Make a string from the macro's argument */
82 #define CLIB_STRING_MACRO(x) #x
84 #define __clib_unused __attribute__ ((unused))
85 #define __clib_weak __attribute__ ((weak))
86 #define __clib_packed __attribute__ ((packed))
87 #define __clib_constructor __attribute__ ((constructor))
89 #define never_inline __attribute__ ((__noinline__))
92 #define always_inline static inline
93 #define static_always_inline static inline
95 #define always_inline static inline __attribute__ ((__always_inline__))
96 #define static_always_inline static inline __attribute__ ((__always_inline__))
100 /* Reserved (unused) structure element with address offset between
102 #define CLIB_PAD_FROM_TO(from,to) u8 pad_##from[(to) - (from)]
104 /* Hints to compiler about hot/cold code. */
105 #define PREDICT_FALSE(x) __builtin_expect((x),0)
106 #define PREDICT_TRUE(x) __builtin_expect((x),1)
108 /* Full memory barrier (read and write). */
109 #define CLIB_MEMORY_BARRIER() __sync_synchronize ()
112 #define CLIB_MEMORY_STORE_BARRIER() __builtin_ia32_sfence ()
114 #define CLIB_MEMORY_STORE_BARRIER() __sync_synchronize ()
117 /* Arranges for function to be called before main. */
118 #define INIT_FUNCTION(decl) \
119 decl __attribute ((constructor)); \
122 /* Arranges for function to be called before exit. */
123 #define EXIT_FUNCTION(decl) \
124 decl __attribute ((destructor)); \
127 /* Use __builtin_clz if available. */
129 #define count_leading_zeros(x) __builtin_clzll (x)
130 #define count_trailing_zeros(x) __builtin_ctzll (x)
132 #define count_leading_zeros(x) __builtin_clzl (x)
133 #define count_trailing_zeros(x) __builtin_ctzl (x)
136 #if defined (count_leading_zeros)
141 n = count_leading_zeros (x);
142 return BITS (uword) - n - 1;
148 uword a = x, b = BITS (uword) / 2, c = 0, r = 0;
150 /* Reduce x to 4 bit result. */
159 if (BITS (uword) > 32)
166 /* Do table lookup on 4 bit partial. */
167 if (BITS (uword) > 32)
169 const u64 table = 0x3333333322221104LL;
170 uword t = (table >> (4 * a)) & 0xf;
171 r = t < 4 ? r + t : ~0;
175 const u32 table = 0x22221104;
176 uword t = (a & 8) ? 3 : ((table >> (4 * a)) & 0xf);
177 r = t < 4 ? r + t : ~0;
187 uword l = min_log2 (x);
188 if (x > ((uword) 1 << l))
196 if (BITS (uword) == 64)
216 return ((uword) 1 << x) - (uword) 1;
222 word y = (word) 1 << min_log2 (x);
231 return 0 == (x & (x - 1));
235 round_pow2 (uword x, uword pow2)
237 return (x + pow2 - 1) & ~(pow2 - 1);
241 round_pow2_u64 (u64 x, u64 pow2)
243 return (x + pow2 - 1) & ~(pow2 - 1);
253 log2_first_set (uword x)
256 #ifdef count_trailing_zeros
257 result = count_trailing_zeros (x);
259 result = min_log2 (first_set (x));
265 flt_round_down (f64 x)
271 flt_round_nearest (f64 x)
273 return (word) (x + .5);
277 flt_round_to_multiple (f64 x, f64 f)
279 return f * flt_round_nearest (x / f);
282 #define clib_max(x,y) \
284 __typeof__ (x) _x = (x); \
285 __typeof__ (y) _y = (y); \
289 #define clib_min(x,y) \
291 __typeof__ (x) _x = (x); \
292 __typeof__ (y) _y = (y); \
296 #define clib_abs(x) \
298 __typeof__ (x) _x = (x); \
302 /* Standard standalone-only function declarations. */
304 void clib_standalone_init (void *memory, uword memory_bytes);
306 void qsort (void *base, uword n, uword size,
307 int (*)(const void *, const void *));
310 /* Stack backtrace. */
312 clib_backtrace (uword * callers, uword max_callers, uword n_frames_to_skip);
314 #endif /* included_clib_h */
317 * fd.io coding-style-patch-verification: ON
320 * eval: (c-set-style "gnu")