aboutsummaryrefslogtreecommitdiffstats
path: root/src/vppinfra/vec.h
blob: bfb7b1b7fc68064f3298fb1b9e53562c47c1337e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
  Copyright (c) 2001, 2002, 2003 Eliot Dresselhaus

  Permission is hereby granted, free of charge, to any person obtaining
  a copy of this software and associated documentation files (the
  "Software"), to deal in the Software without restriction, including
  without limitation the rights to use, copy, modify, merge, publish,
  distribute, sublicense, and/or sell copies of the Software, and to
  permit persons to whom the Software is furnished to do so, subject to
  the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#ifndef included_vec_h
#define included_vec_h

#include <vppinfra/clib.h>	/* word, etc */
#include <vppinfra/mem.h>	/* clib_mem_free */
#include <vppinfra/string.h>	/* memcpy, memmove */
#include <vppinfra/vec_bootstrap.h>

/** \file

   CLIB vectors are ubiquitous dynamically resized arrays with by user
   defined "headers".  Many CLIB data structures (e.g. hash, heap,
   pool) are vectors with various different headers.

   The memory layout looks like this:

~~~~~~~~
		    user header (start of memory allocation)
		    padding
		    heap pointer (optional, only if default_heap == 0)
		    vector header: number of elements, header size
   user's pointer-> vector element #0
		    vector element #1
		    ...
~~~~~~~~

   The user pointer contains the address of vector element # 0.  Null
   pointer vectors are valid and mean a zero length vector.

   You can reset the length of an allocated vector to zero via the
   vec_reset_length(v) macro, or by setting the vector length field to
   zero (e.g. _vec_len (v) = 0). Vec_reset_length(v) preferred: it
   understands Null pointers.

   Typically, the header is not present.  Headers allow for other
   data structures to be built atop CLIB vectors.

   While users may specify the alignment for first data element of a vector
   via the vec_*_aligned macros that is typically not needed as alignment
   is set based on native alignment of the data structure used.

   Vector elements can be any C type e.g. (int, double, struct bar).
   This is also true for data types built atop vectors (e.g. heap,
   pool, etc.).

   Many macros have \_a variants supporting alignment of vector elements
   and \_h variants supporting non-zero-length vector headers. The \_ha
   variants support both.  Additionally cacheline alignment within a
   vector element structure can be specified using the
   CLIB_CACHE_LINE_ALIGN_MARK() macro.

   Standard programming error: memorize a pointer to the ith element
   of a vector then expand it. Vectors expand by 3/2, so such code
   may appear to work for a period of time. Memorize vector indices
   which are invariant.
 */

/** \brief Low-level (re)allocation function, usually not called directly

    @param v pointer to a vector
    @param n_elts requested number of elements
    @param elt_sz requested size of one element
    @param hdr_sz header size in bytes (may be zero)
    @param align alignment (may be zero)
    @return v_prime pointer to resized vector, may or may not equal v
*/
void *_vec_realloc (void *v, uword n_elts, uword elt_sz, uword hdr_sz,
		    uword align, void *heap);

/* calculate minimum alignment out of data natural alignment and provided
 * value, should not be < VEC_MIN_ALIGN */
static_always_inline uword
__vec_align (uword data_align, uword configuered_align)
{
  data_align = clib_max (data_align, configuered_align);
  ASSERT (count_set_bits (data_align) == 1);
  return clib_max (VEC_MIN_ALIGN, data_align);
}

/* function used t o catch cases where vec_* macros on used on void * */
static_always_inline uword
__vec_elt_sz (uword elt_sz, int is_void)
{
  /* vector macro operations on void * are not allowed */
  ASSERT (is_void == 0);
  return elt_sz;
}

static_always_inline void
_vec_update_pointer (void **vp, void *v)
{
  /* avoid store if not needed */
  if (v != vp[0])
    vp[0] = v;
}

static_always_inline void *
vec_get_heap (void *v)
{
  if (v == 0 || _vec_find (v)->default_heap == 1)
    return 0;
  return _vec_heap (v);
}

static_always_inline void *
_vec_realloc_inline (void *v, uword n_elts, uword elt_sz, uword hdr_sz,
		     uword align, void *heap)
{
  if (PREDICT_TRUE (v != 0))
    {
      /* Vector header must start heap object. */
      ASSERT (clib_mem_heap_is_heap_object (vec_get_heap (v), vec_header (v)));

      /* Typically we'll not need to resize. */
      if ((n_elts * elt_sz) <= vec_max_bytes (v))
	{
	  _vec_set_len (v, n_elts, elt_sz);
	  return v;
	}
    }

  /* Slow path: call helper function. */
  return _vec_realloc (v, n_elts, elt_sz, hdr_sz, align, heap);
}

static_always_inline void
_vec_prealloc (void **vp, uword n_elts, uword hdr_sz, uword align, void *heap,
	       uword elt_sz)
{
  void *v;

  ASSERT (vp[0] == 0);

  v = _vec_realloc (0, n_elts, elt_sz, hdr_sz, align, heap);
  _vec_set_len (v, 0, elt_sz);
  _vec_update_pointer (vp, v);
}

/** \brief Pre-allocate a vector (generic version)

    @param V pointer to a vector
    @param N number of elements to pre-allocate
    @param H header size in bytes (may be zero)
    @param A alignment (zero means default alignment of the data structure)
    @param P heap (zero means default heap)
    @return V (value-result macro parameter)
*/

#define vec_prealloc_hap(V, N, H, A, P)                                       \
  _vec_prealloc ((void **) &(V), N, H, _vec_align (V, A), P, _vec_elt_sz (V))

/** \brief Pre-allocate a vector (simple version)

    @param V pointer to a vector
    @param N number of elements to pre-allocate
    @return V (value-result macro parameter)
*/
#define vec_prealloc(V, N) vec_prealloc_hap (V, N, 0, 0, 0)

/** \brief Pre-allocate a vector (heap version)

    @param V pointer to a vector
    @param N number of elements to pre-allocate
    @param P heap (zero means default heap)
    @return V (value-result macro parameter)
*/
#define vec_prealloc_heap(V, N, P) vec_prealloc_hap (V, N, 0, 0, P)

always_inline int
_vec_resize_will_expand (void *v, uword n_elts, uword elt_sz)
{
  if (v == 0)
    return 1;

  /* Vector header must start heap object. */
  ASSERT (clib_mem_heap_is_heap_object (vec_get_heap (v), vec_header (v)));

  n_elts += _vec_len (v);
  if ((n_elts * elt_sz) <= vec_max_bytes (v))
    return 0;

  return 1;
}

/** \brief Determine if vector will resize with next allocation

    @param V pointer to a vector
    @param N number of elements to add
    @return 1 if vector will resize 0 otherwise
*/

#define vec_resize_will_expand(V, N)                                          \
  _vec_resize_will_expand (V, N, _vec_elt_sz (V))

/* Local variable naming macro (prevents collisions with other macro naming). */
#define _v(var) _vec_##var

/** \brief Resize a vector (general version).
   Add N elements to end of given vector V, return pointer to start of vector.
   Vector will have room for H header bytes and will have user's data aligned
   at alignment A (rounded to next power of 2).

    @param V pointer to a vector
    @param N number of elements to add
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/

static_always_inline void
_vec_resize (void **vp, uword n_add, uword hdr_sz, uword align, uword elt_sz)
{
  void *v = vp[0];
  v = _vec_realloc_inline (v, vec_len (v) + n_add, elt_sz, hdr_sz, align, 0);
  _vec_update_pointer (vp, v);
}

#define vec_resize_ha(V, N, H, A)                                             \
  _vec_resize ((void **) &(V), N, H, _vec_align (V, A), _vec_elt_sz (V))

/** \brief Resize a vector (no header, unspecified alignment)
   Add N elements to end of given vector V, return pointer to start of vector.
   Vector will have room for H header bytes and will have user's data aligned
   at alignment A (rounded to next power of 2).

    @param V pointer to a vector
    @param N number of elements to add
    @return V (value-result macro parameter)
*/
#define vec_resize(V,N)     vec_resize_ha(V,N,0,0)

/** \brief Resize a vector (no header, alignment specified).
   Add N elements to end of given vector V, return pointer to start of vector.
   Vector will have room for H header bytes and will have user's data aligned
   at alignment A (rounded to next power of 2).

    @param V pointer to a vector
    @param N number of elements to add
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/

#define vec_resize_aligned(V,N,A) vec_resize_ha(V,N,0,A)

/** \brief Allocate space for N more elements

    @param V pointer to a vector
    @param N number of elements to add
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/

#define vec_alloc_ha(V, N, H, A)                                              \
  do                                                                          \
    {                                                                         \
      uword _v (l) = vec_len (V);                                             \
      vec_resize_ha (V, N, H, A);                                             \
      vec_set_len (V, _v (l));                                                \
    }                                                                         \
  while (0)

/** \brief Allocate space for N more elements
    (no header, unspecified alignment)

    @param V pointer to a vector
    @param N number of elements to add
    @return V (value-result macro parameter)
*/
#define vec_alloc(V,N) vec_alloc_ha(V,N,0,0)

/** \brief Allocate space for N more elements (no header, given alignment)
    @param V pointer to a vector
    @param N number of elements to add
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/

#define vec_alloc_aligned(V,N,A) vec_alloc_ha(V,N,0,A)

/** \brief Create new vector of given type and length (general version).
    @param T type of elements in new vector
    @param N number of elements to add
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @param P heap (may be zero)
    @return V new vector
*/
#define vec_new_generic(T, N, H, A, P)                                        \
  _vec_realloc (0, N, sizeof (T), H, _vec_align ((T *) 0, A), P)

/** \brief Create new vector of given type and length
    (unspecified alignment, no header).

    @param T type of elements in new vector
    @param N number of elements to add
    @return V new vector
*/
#define vec_new(T, N) vec_new_generic (T, N, 0, 0, 0)
/** \brief Create new vector of given type and length
    (alignment specified, no header).

    @param T type of elements in new vector
    @param N number of elements to add
    @param A alignment (may be zero)
    @return V new vector
*/
#define vec_new_aligned(T, N, A) vec_new_generic (T, N, 0, A, 0)
/** \brief Create new vector of given type and length
    (heap specified, no header).

    @param T type of elements in new vector
    @param N number of elements to add
    @param P heap (may be zero)
    @return V new vector
*/
#define vec_new_heap(T, N, P) vec_new_generic (T, N, 0, 0, P)

/** \brief Free vector's memory (no header).
    @param V pointer to a vector
    @return V (value-result parameter, V=0)
*/

static_always_inline void
_vec_free (void **vp)
{
  if (vp[0] == 0)
    return;
  clib_mem_free (vec_header (vp[0]));
  vp[0] = 0;
}

#define vec_free(V) _vec_free ((void **) &(V))

void vec_free_not_inline (void *v);

/**\brief Free vector user header (syntactic sugar)
   @param h vector header
   @void
*/
#define vec_free_header(h) clib_mem_free (h)

/** \brief Return copy of vector (general version).

    @param V pointer to a vector
    @param H size of header in bytes
    @param A alignment (may be zero)

    @return Vdup copy of vector
*/

static_always_inline void *
_vec_dup (void *v, uword hdr_size, uword align, uword elt_sz)
{
  uword len = vec_len (v);
  void *n = 0;

  if (len)
    {
      n = _vec_realloc (0, len, elt_sz, hdr_size, align, 0);
      clib_memcpy_fast (n, v, len * elt_sz);
    }
  return n;
}

#define vec_dup_ha(V, H, A)                                                   \
  _vec_dup ((void *) (V), H, _vec_align (V, A), _vec_elt_sz (V))

/** \brief Return copy of vector (no header, no alignment)

    @param V pointer to a vector
    @return Vdup copy of vector
*/
#define vec_dup(V) vec_dup_ha(V,0,0)

/** \brief Return copy of vector (no header, alignment specified).

    @param V pointer to a vector
    @param A alignment (may be zero)

    @return Vdup copy of vector
*/
#define vec_dup_aligned(V,A) vec_dup_ha(V,0,A)

/** \brief Copy a vector, memcpy wrapper. Assumes sizeof(SRC[0]) ==
    sizeof(DST[0])

    @param DST destination
    @param SRC source
*/
#define vec_copy(DST,SRC) clib_memcpy_fast (DST, SRC, vec_len (DST) * \
				       sizeof ((DST)[0]))

/** \brief Clone a vector. Make a new vector with the
    same size as a given vector but possibly with a different type.

    @param NEW_V pointer to new vector
    @param OLD_V pointer to old vector
*/

static_always_inline void
_vec_clone (void **v1p, void *v2, uword align, uword elt_sz)
{
  v1p[0] = _vec_realloc (0, vec_len (v2), elt_sz, 0, align, 0);
}
#define vec_clone(NEW_V, OLD_V)                                               \
  _vec_clone ((void **) &(NEW_V), OLD_V, _vec_align (NEW_V, 0),               \
	      _vec_elt_sz (NEW_V))

/** \brief Make sure vector is long enough for given index (general version).

    @param V (possibly NULL) pointer to a vector.
    @param I vector index which will be valid upon return
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/

always_inline void
_vec_zero_elts (void *v, uword first, uword count, uword elt_sz)
{
  clib_memset_u8 (v + (first * elt_sz), 0, count * elt_sz);
}
#define vec_zero_elts(V, F, C) _vec_zero_elts (V, F, C, sizeof ((V)[0]))

static_always_inline void
_vec_validate (void **vp, uword index, uword header_size, uword align,
	       void *heap, uword elt_sz)
{
  void *v = vp[0];
  uword vl = vec_len (v);
  if (index >= vl)
    {
      v = _vec_realloc_inline (v, index + 1, elt_sz, header_size, align, heap);
      _vec_zero_elts (v, vl, index - vl + 1, elt_sz);
      _vec_update_pointer (vp, v);
    }
}

#define vec_validate_hap(V, I, H, A, P)                                       \
  _vec_validate ((void **) &(V), I, H, _vec_align (V, A), 0, sizeof ((V)[0]))

/** \brief Make sure vector is long enough for given index
    (no header, unspecified alignment)

    @param V (possibly NULL) pointer to a vector.
    @param I vector index which will be valid upon return
    @return V (value-result macro parameter)
*/
#define vec_validate(V, I) vec_validate_hap (V, I, 0, 0, 0)

/** \brief Make sure vector is long enough for given index
    (no header, specified alignment)

    @param V (possibly NULL) pointer to a vector.
    @param I vector index which will be valid upon return
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/

#define vec_validate_aligned(V, I, A) vec_validate_hap (V, I, 0, A, 0)

/** \brief Make sure vector is long enough for given index
    (no header, specified heap)

    @param V (possibly NULL) pointer to a vector.
    @param I vector index which will be valid upon return
    @param H heap (may be zero)
    @return V (value-result macro parameter)
*/

#define vec_validate_heap(V, I, P) vec_validate_hap (V, I, 0, 0, P)

/** \brief Make sure vector is long enough for given index
    and initialize empty space (general version)

    @param V (possibly NULL) pointer to a vector.
    @param I vector index which will be valid upon return
    @param INIT initial value (can be a complex expression!)
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/
#define vec_validate_init_empty_ha(V, I, INIT, H, A)                          \
  do                                                                          \
    {                                                                         \
      word _v (i) = (I);                                                      \
      word _v (l) = vec_len (V);                                              \
      if (_v (i) >= _v (l))                                                   \
	{                                                                     \
	  vec_resize_ha (V, 1 + (_v (i) - _v (l)), H, A);                     \
	  while (_v (l) <= _v (i))                                            \
	    {                                                                 \
	      (V)[_v (l)] = (INIT);                                           \
	      _v (l)++;                                                       \
	    }                                                                 \
	}                                                                     \
    }                                                                         \
  while (0)

/** \brief Make sure vector is long enough for given index
    and initialize empty space (no header, unspecified alignment)

    @param V (possibly NULL) pointer to a vector.
    @param I vector index which will be valid upon return
    @param INIT initial value (can be a complex expression!)
    @return V (value-result macro parameter)
*/

#define vec_validate_init_empty(V,I,INIT) \
  vec_validate_init_empty_ha(V,I,INIT,0,0)

/** \brief Make sure vector is long enough for given index
    and initialize empty space (no header, alignment alignment)

    @param V (possibly NULL) pointer to a vector.
    @param I vector index which will be valid upon return
    @param INIT initial value (can be a complex expression!)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/
#define vec_validate_init_empty_aligned(V,I,INIT,A) \
  vec_validate_init_empty_ha(V,I,INIT,0,A)

/** \brief Add 1 element to end of vector (general version).

    @param V pointer to a vector
    @param E element to add
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/

static_always_inline void *
_vec_add1 (void **vp, uword hdr_sz, uword align, uword elt_sz)
{
  void *v = vp[0];
  uword len = vec_len (v);
  v = _vec_realloc_inline (v, len + 1, elt_sz, hdr_sz, align, 0);

  _vec_update_pointer (vp, v);

  return v + len * elt_sz;
}

#define vec_add1_ha(V, E, H, A)                                               \
  ((__typeof__ ((V)[0]) *) _vec_add1 ((void **) &(V), H, _vec_align (V, A),   \
				      _vec_elt_sz (V)))[0] = (E)

/** \brief Add 1 element to end of vector (unspecified alignment).

    @param V pointer to a vector
    @param E element to add
    @return V (value-result macro parameter)
*/
#define vec_add1(V,E)           vec_add1_ha(V,E,0,0)

/** \brief Add 1 element to end of vector (alignment specified).

    @param V pointer to a vector
    @param E element to add
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/
#define vec_add1_aligned(V,E,A) vec_add1_ha(V,E,0,A)

/** \brief Add N elements to end of vector V,
    return pointer to new elements in P. (general version)

    @param V pointer to a vector
    @param P pointer to new vector element(s)
    @param N number of elements to add
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @return V and P (value-result macro parameters)
*/

static_always_inline void
_vec_add2 (void **vp, void **pp, uword n_add, uword hdr_sz, uword align,
	   uword elt_sz)
{
  void *v = vp[0];
  uword len = vec_len (vp[0]);
  v = _vec_realloc_inline (v, len + n_add, elt_sz, hdr_sz, align, 0);
  _vec_update_pointer (vp, v);
  pp[0] = v + len * elt_sz;
}

#define vec_add2_ha(V, P, N, H, A)                                            \
  _vec_add2 ((void **) &(V), (void **) &(P), N, H, _vec_align (V, A),         \
	     _vec_elt_sz (V))

/** \brief Add N elements to end of vector V,
    return pointer to new elements in P. (no header, unspecified alignment)

    @param V pointer to a vector
    @param P pointer to new vector element(s)
    @param N number of elements to add
    @return V and P (value-result macro parameters)
*/

#define vec_add2(V,P,N)           vec_add2_ha(V,P,N,0,0)

/** \brief Add N elements to end of vector V,
    return pointer to new elements in P. (no header, alignment specified)

    @param V pointer to a vector
    @param P pointer to new vector element(s)
    @param N number of elements to add
    @param A alignment (may be zero)
    @return V and P (value-result macro parameters)
*/

#define vec_add2_aligned(V,P,N,A) vec_add2_ha(V,P,N,0,A)

/** \brief Add N elements to end of vector V (general version)

    @param V pointer to a vector
    @param E pointer to element(s) to add
    @param N number of elements to add
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/
static_always_inline void
_vec_add (void **vp, void *e, word n_add, uword hdr_sz, uword align,
	  uword elt_sz)
{
  void *v = vp[0];
  uword len = vec_len (v);

  ASSERT (n_add >= 0);

  if (n_add < 1)
    return;

  v = _vec_realloc_inline (v, len + n_add, elt_sz, hdr_sz, align, 0);
  clib_memcpy_fast (v + len * elt_sz, e, n_add * elt_sz);
  _vec_update_pointer (vp, v);
}

#define vec_add_ha(V, E, N, H, A)                                             \
  _vec_add ((void **) &(V), (void *) (E), N, H, _vec_align (V, A),            \
	    _vec_elt_sz (V))

/** \brief Add N elements to end of vector V (no header, unspecified alignment)

    @param V pointer to a vector
    @param E pointer to element(s) to add
    @param N number of elements to add
    @return V (value-result macro parameter)
*/
#define vec_add(V,E,N)           vec_add_ha(V,E,N,0,0)

/** \brief Add N elements to end of vector V (no header, specified alignment)

    @param V pointer to a vector
    @param E pointer to element(s) to add
    @param N number of elements to add
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/
#define vec_add_aligned(V,E,N,A) vec_add_ha(V,E,N,0,A)

/** \brief Returns last element of a vector and decrements its length

    @param V pointer to a vector
    @return E element removed from the end of the vector
*/
#define vec_pop(V)                                                            \
  ({                                                                          \
    uword _v (l) = vec_len (V);                                               \
    __typeof__ ((V)[0]) _v (rv);                                              \
    ASSERT (_v (l) > 0);                                                      \
    _v (l) -= 1;                                                              \
    _v (rv) = (V)[_v (l)];                                                    \
    vec_set_len (V, _v (l));                                                  \
    (_v (rv));                                                                \
  })

/** \brief Set E to the last element of a vector, decrement vector length
    @param V pointer to a vector
    @param E pointer to the last vector element
    @return E element removed from the end of the vector
    (value-result macro parameter
*/

#define vec_pop2(V,E)				\
({						\
  uword _v(l) = vec_len (V);			\
  if (_v(l) > 0) (E) = vec_pop (V);		\
  _v(l) > 0;					\
})

/** \brief Insert N vector elements starting at element M,
    initialize new elements (general version).

    @param V (possibly NULL) pointer to a vector.
    @param N number of elements to insert
    @param M insertion point
    @param INIT initial value (can be a complex expression!)
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/

static_always_inline void
_vec_insert (void **vp, uword n_insert, uword ins_pt, u8 init, uword hdr_sz,
	     uword align, uword elt_sz)
{
  void *v = vp[0];
  uword len = vec_len (v);

  ASSERT (ins_pt <= len);

  v = _vec_realloc_inline (v, len + n_insert, elt_sz, hdr_sz, align, 0);
  clib_memmove (v + elt_sz * (ins_pt + n_insert), v + ins_pt * elt_sz,
		(len - ins_pt) * elt_sz);
  _vec_zero_elts (v, ins_pt, n_insert, elt_sz);
  _vec_update_pointer (vp, v);
}

#define vec_insert_init_empty_ha(V, N, M, INIT, H, A)                         \
  _vec_insert ((void **) &(V), N, M, INIT, H, _vec_align (V, A),              \
	       _vec_elt_sz (V))

/** \brief Insert N vector elements starting at element M,
    initialize new elements to zero (general version)

    @param V (possibly NULL) pointer to a vector.
    @param N number of elements to insert
    @param M insertion point
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/
#define vec_insert_ha(V,N,M,H,A)    vec_insert_init_empty_ha(V,N,M,0,H,A)

/** \brief Insert N vector elements starting at element M,
    initialize new elements to zero (no header, unspecified alignment)

    @param V (possibly NULL) pointer to a vector.
    @param N number of elements to insert
    @param M insertion point
    @return V (value-result macro parameter)
*/
#define vec_insert(V,N,M)           vec_insert_ha(V,N,M,0,0)

/** \brief Insert N vector elements starting at element M,
    initialize new elements to zero (no header, alignment specified)

    @param V (possibly NULL) pointer to a vector.
    @param N number of elements to insert
    @param M insertion point
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/
#define vec_insert_aligned(V,N,M,A) vec_insert_ha(V,N,M,0,A)

/** \brief Insert N vector elements starting at element M,
    initialize new elements (no header, unspecified alignment)

    @param V (possibly NULL) pointer to a vector.
    @param N number of elements to insert
    @param M insertion point
    @param INIT initial value (can be a complex expression!)
    @return V (value-result macro parameter)
*/

#define vec_insert_init_empty(V,N,M,INIT) \
  vec_insert_init_empty_ha(V,N,M,INIT,0,0)
/* Resize vector by N elements starting from element M, initialize new elements to INIT (alignment specified, no header). */

/** \brief Insert N vector elements starting at element M,
    initialize new elements (no header, specified alignment)

    @param V (possibly NULL) pointer to a vector.
    @param N number of elements to insert
    @param M insertion point
    @param INIT initial value (can be a complex expression!)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/
#define vec_insert_init_empty_aligned(V,N,M,INIT,A) \
  vec_insert_init_empty_ha(V,N,M,INIT,0,A)

/** \brief Insert N vector elements starting at element M,
    insert given elements (general version)

    @param V (possibly NULL) pointer to a vector.
    @param E element(s) to insert
    @param N number of elements to insert
    @param M insertion point
    @param H header size in bytes (may be zero)
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/

static_always_inline void
_vec_insert_elts (void **vp, void *e, uword n_insert, uword ins_pt,
		  uword hdr_sz, uword align, uword elt_sz)
{
  void *v = vp[0];
  uword len = vec_len (v);

  ASSERT (ins_pt <= len);

  v = _vec_realloc_inline (v, len + n_insert, elt_sz, hdr_sz, align, 0);
  clib_memmove (v + elt_sz * (ins_pt + n_insert), v + ins_pt * elt_sz,
		(len - ins_pt) * elt_sz);
  _vec_zero_elts (v, ins_pt, n_insert, elt_sz);
  clib_memcpy_fast (v + ins_pt * elt_sz, e, n_insert * elt_sz);
  _vec_update_pointer (vp, v);
}

#define vec_insert_elts_ha(V, E, N, M, H, A)                                  \
  _vec_insert_elts ((void **) &(V), E, N, M, H, _vec_align (V, A),            \
		    _vec_elt_sz (V))

/** \brief Insert N vector elements starting at element M,
    insert given elements (no header, unspecified alignment)

    @param V (possibly NULL) pointer to a vector.
    @param E element(s) to insert
    @param N number of elements to insert
    @param M insertion point
    @return V (value-result macro parameter)
*/
#define vec_insert_elts(V,E,N,M)           vec_insert_elts_ha(V,E,N,M,0,0)

/** \brief Insert N vector elements starting at element M,
    insert given elements (no header, specified alignment)

    @param V (possibly NULL) pointer to a vector.
    @param E element(s) to insert
    @param N number of elements to insert
    @param M insertion point
    @param A alignment (may be zero)
    @return V (value-result macro parameter)
*/
#define vec_insert_elts_aligned(V,E,N,M,A) vec_insert_elts_ha(V,E,N,M,0,A)

/** \brief Delete N elements starting at element M

    @param V pointer to a vector
    @param N number of elements to delete
    @param M first element to delete
    @return V (value-result macro parameter)
*/

static_always_inline void
_vec_delete (void *v, uword n_del, uword first, uword elt_sz)
{
  word n_bytes_del, n_bytes_to_move, len = vec_len (v);
  u8 *dst;

  if (n_del == 0)
    return;

  ASSERT (first + n_del <= len);

  n_bytes_del = n_del * elt_sz;
  n_bytes_to_move = (len - first - n_del) * elt_sz;
  dst = v + first * elt_sz;

  if (n_bytes_to_move > 0)
    clib_memmove (dst, dst + n_bytes_del, n_bytes_to_move);
  clib_memset (dst + n_bytes_to_move, 0, n_bytes_del);

  _vec_set_len (v, _vec_len (v) - n_del, elt_sz);
}

#define vec_delete(V, N, M) _vec_delete ((void *) (V), N, M, _vec_elt_sz (V))

/** \brief Delete the element at index I

    @param V pointer to a vector
    @param I index to delete
*/

static_always_inline void
_vec_del1 (void *v, uword index, uword elt_sz)
{
  uword len = _vec_len (v) - 1;

  if (index < len)
    clib_memcpy_fast (v + index * elt_sz, v + len * elt_sz, elt_sz);

  _vec_set_len (v, len, elt_sz);
}

#define vec_del1(v, i) _vec_del1 ((void *) (v), i, _vec_elt_sz (v))

static_always_inline void
_vec_append (void **v1p, void *v2, uword v1_elt_sz, uword v2_elt_sz,
	     uword align)
{
  void *v1 = v1p[0];
  uword len1 = vec_len (v1);
  uword len2 = vec_len (v2);

  if (PREDICT_TRUE (len2 > 0))
    {
      v1 = _vec_realloc_inline (v1, len1 + len2, v2_elt_sz, 0, align, 0);
      clib_memcpy_fast (v1 + len1 * v1_elt_sz, v2, len2 * v2_elt_sz);
      _vec_update_pointer (v1p, v1);
    }
}

/** \brief Append v2 after v1. Result in v1. Specified alignment.
    @param V1 target vector
    @param V2 vector to append
    @param align required alignment
*/

#define vec_append_aligned(v1, v2, align)                                     \
  _vec_append ((void **) &(v1), (void *) (v2), _vec_elt_sz (v1),              \
	       _vec_elt_sz (v2), _vec_align (v1, align))

/** \brief Append v2 after v1. Result in v1.
    @param V1 target vector
    @param V2 vector to append
*/

#define vec_append(v1, v2) vec_append_aligned (v1, v2, 0)

static_always_inline void
_vec_prepend (void **v1p, void *v2, uword v1_elt_sz, uword v2_elt_sz,
	      uword align)
{
  void *v1 = v1p[0];
  uword len1 = vec_len (v1);
  uword len2 = vec_len (v2);

  if (PREDICT_TRUE (len2 > 0))
    {
      v1 = _vec_realloc_inline (v1, len1 + len2, v2_elt_sz, 0, align, 0);
      clib_memmove (v1 + len2 * v2_elt_sz, v1p[0], len1 * v1_elt_sz);
      clib_memcpy_fast (v1, v2, len2 * v2_elt_sz);
      _vec_update_pointer (v1p, v1);
    }
}

/** \brief Prepend v2 before v1. Result in v1. Specified alignment
    @param V1 target vector
    @param V2 vector to prepend
    @param align required alignment
*/

#define vec_prepend_aligned(v1, v2, align)                                    \
  _vec_prepend ((void **) &(v1), (void *) (v2), _vec_elt_sz (v1),             \
		_vec_elt_sz (v2), _vec_align (v1, align))

/** \brief Prepend v2 before v1. Result in v1.
    @param V1 target vector
    @param V2 vector to prepend
*/

#define vec_prepend(v1, v2) vec_prepend_aligned (v1, v2, 0)

/** \brief Zero all vector elements. Null-pointer tolerant.
    @param var Vector to zero
*/
static_always_inline void
_vec_zero (void *v, uword elt_sz)
{
  uword len = vec_len (v);

  if (len)
    clib_memset_u8 (v, 0, len * elt_sz);
}

#define vec_zero(var) _vec_zero ((void *) (var), _vec_elt_sz (var))

/** \brief Set all vector elements to given value. Null-pointer tolerant.
    @param v vector to set
    @param val value for each vector element
*/
#define vec_set(v,val)				\
do {						\
  word _v(i);					\
  __typeof__ ((v)[0]) _val = (val);		\
  for (_v(i) = 0; _v(i) < vec_len (v); _v(i)++)	\
    (v)[_v(i)] = _val;				\
} while (0)

#ifdef CLIB_UNIX
#include <stdlib.h>		/* for qsort */
#endif

/** \brief Compare two vectors, not NULL-pointer tolerant

    @param v1 Pointer to a vector
    @param v2 Pointer to a vector
    @return 1 if equal, 0 if unequal
*/
static_always_inline int
_vec_is_equal (void *v1, void *v2, uword v1_elt_sz, uword v2_elt_sz)
{
  uword vec_len_v1 = vec_len (v1);

  if ((vec_len_v1 != vec_len (v2)) || (v1_elt_sz != v2_elt_sz))
    return 0;

  if ((vec_len_v1 == 0) || (memcmp (v1, v2, vec_len_v1 * v1_elt_sz) == 0))
    return 1;

  return 0;
}

#define vec_is_equal(v1, v2)                                                  \
  _vec_is_equal ((void *) (v1), (void *) (v2), _vec_elt_sz (v1),              \
		 _vec_elt_sz (v2))

/** \brief Compare two vectors (only applicable to vectors of signed numbers).
   Used in qsort compare functions.

    @param v1 Pointer to a vector
    @param v2 Pointer to a vector
    @return -1, 0, +1
*/
#define vec_cmp(v1,v2)					\
({							\
  word _v(i), _v(cmp), _v(l);				\
  _v(l) = clib_min (vec_len (v1), vec_len (v2));	\
  _v(cmp) = 0;						\
  for (_v(i) = 0; _v(i) < _v(l); _v(i)++) {		\
    _v(cmp) = (v1)[_v(i)] - (v2)[_v(i)];		\
    if (_v(cmp))					\
      break;						\
  }							\
  if (_v(cmp) == 0 && _v(l) > 0)			\
    _v(cmp) = vec_len(v1) - vec_len(v2);		\
  (_v(cmp) < 0 ? -1 : (_v(cmp) > 0 ? +1 : 0));		\
})

/** \brief Search a vector for the index of the entry that matches.

    @param v Pointer to a vector
    @param E Entry to match
    @return index of match or ~0
*/
#define vec_search(v,E)					\
({							\
  word _v(i) = 0;					\
  while (_v(i) < vec_len(v))				\
  {							\
    if ((v)[_v(i)] == E)				        \
      break;						\
    _v(i)++;						\
  }							\
  if (_v(i) == vec_len(v))				\
    _v(i) = ~0;					        \
  _v(i);						\
})

/** \brief Search a vector for the index of the entry that matches.

    @param v Pointer to a vector
    @param E Pointer to entry to match
    @param fn Comparison function !0 => match
    @return index of match or ~0
*/
#define vec_search_with_function(v,E,fn)                \
({							\
  word _v(i) = 0;					\
  while (_v(i) < vec_len(v))				\
  {							\
    if (0 != fn(&(v)[_v(i)], (E)))                      \
      break;						\
    _v(i)++;						\
  }							\
  if (_v(i) == vec_len(v))				\
    _v(i) = ~0;					        \
  _v(i);						\
})

/** \brief Sort a vector using the supplied element comparison function

    Does not depend on the underlying implementation to deal correctly
    with null, zero-long, or 1-long vectors

    @param vec vector to sort
    @param f comparison function
*/
#define vec_sort_with_function(vec,f)                           \
do {                                                            \
  if (vec_len (vec) > 1)                                        \
    qsort (vec, vec_len (vec), sizeof (vec[0]), (void *) (f));  \
} while (0)

/** \brief Make a vector containing a NULL terminated c-string.

    @param V (possibly NULL) pointer to a vector.
    @param S pointer to string buffer.
    @param L string length (NOT including the terminating NULL; a la strlen())
*/
#define vec_validate_init_c_string(V, S, L)                                   \
  do                                                                          \
    {                                                                         \
      vec_reset_length (V);                                                   \
      vec_validate (V, (L));                                                  \
      if ((S) && (L))                                                         \
	clib_memcpy_fast (V, (S), (L));                                       \
      (V)[(L)] = 0;                                                           \
    }                                                                         \
  while (0)

/** \brief Test whether a vector is a NULL terminated c-string.

    @param V (possibly NULL) pointer to a vector.
    @return BOOLEAN indicating if the vector c-string is null terminated.
*/
#define vec_c_string_is_terminated(V)                   \
  (((V) != 0) && (vec_len (V) != 0) && ((V)[vec_len ((V)) - 1] == 0))

/** \brief (If necessary) NULL terminate a vector containing a c-string.

    @param V (possibly NULL) pointer to a vector.
    @return V (value-result macro parameter)
*/
#define vec_terminate_c_string(V)                                             \
  do                                                                          \
    {                                                                         \
      if (!vec_c_string_is_terminated (V))                                    \
	vec_add1 (V, 0);                                                      \
    }                                                                         \
  while (0)

#endif /* included_vec_h */