File: ghash.c

package info (click to toggle)
glib2.0 2.58.3-2+deb10u2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, buster-backports, sid
  • size: 48,956 kB
  • sloc: ansic: 452,656; xml: 16,781; python: 6,149; makefile: 3,776; sh: 1,499; perl: 1,140; cpp: 9
file content (2128 lines) | stat: -rw-r--r-- 62,151 bytes parent folder | download
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
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
/* GLIB - Library of useful routines for C programming
 * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
 * file for a list of people on the GLib Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GLib at ftp://ftp.gtk.org/pub/gtk/.
 */

/*
 * MT safe
 */

#include "config.h"

#include <string.h>  /* memset */

#include "ghash.h"

#include "glib-private.h"
#include "gstrfuncs.h"
#include "gatomic.h"
#include "gtestutils.h"
#include "gslice.h"
#include "grefcount.h"

/**
 * SECTION:hash_tables
 * @title: Hash Tables
 * @short_description: associations between keys and values so that
 *     given a key the value can be found quickly
 *
 * A #GHashTable provides associations between keys and values which is
 * optimized so that given a key, the associated value can be found
 * very quickly.
 *
 * Note that neither keys nor values are copied when inserted into the
 * #GHashTable, so they must exist for the lifetime of the #GHashTable.
 * This means that the use of static strings is OK, but temporary
 * strings (i.e. those created in buffers and those returned by GTK+
 * widgets) should be copied with g_strdup() before being inserted.
 *
 * If keys or values are dynamically allocated, you must be careful to
 * ensure that they are freed when they are removed from the
 * #GHashTable, and also when they are overwritten by new insertions
 * into the #GHashTable. It is also not advisable to mix static strings
 * and dynamically-allocated strings in a #GHashTable, because it then
 * becomes difficult to determine whether the string should be freed.
 *
 * To create a #GHashTable, use g_hash_table_new().
 *
 * To insert a key and value into a #GHashTable, use
 * g_hash_table_insert().
 *
 * To lookup a value corresponding to a given key, use
 * g_hash_table_lookup() and g_hash_table_lookup_extended().
 *
 * g_hash_table_lookup_extended() can also be used to simply
 * check if a key is present in the hash table.
 *
 * To remove a key and value, use g_hash_table_remove().
 *
 * To call a function for each key and value pair use
 * g_hash_table_foreach() or use a iterator to iterate over the
 * key/value pairs in the hash table, see #GHashTableIter.
 *
 * To destroy a #GHashTable use g_hash_table_destroy().
 *
 * A common use-case for hash tables is to store information about a
 * set of keys, without associating any particular value with each
 * key. GHashTable optimizes one way of doing so: If you store only
 * key-value pairs where key == value, then GHashTable does not
 * allocate memory to store the values, which can be a considerable
 * space saving, if your set is large. The functions
 * g_hash_table_add() and g_hash_table_contains() are designed to be
 * used when using #GHashTable this way.
 *
 * #GHashTable is not designed to be statically initialised with keys and
 * values known at compile time. To build a static hash table, use a tool such
 * as [gperf](https://www.gnu.org/software/gperf/).
 */

/**
 * GHashTable:
 *
 * The #GHashTable struct is an opaque data structure to represent a
 * [Hash Table][glib-Hash-Tables]. It should only be accessed via the
 * following functions.
 */

/**
 * GHashFunc:
 * @key: a key
 *
 * Specifies the type of the hash function which is passed to
 * g_hash_table_new() when a #GHashTable is created.
 *
 * The function is passed a key and should return a #guint hash value.
 * The functions g_direct_hash(), g_int_hash() and g_str_hash() provide
 * hash functions which can be used when the key is a #gpointer, #gint*,
 * and #gchar* respectively.
 *
 * g_direct_hash() is also the appropriate hash function for keys
 * of the form `GINT_TO_POINTER (n)` (or similar macros).
 *
 * A good hash functions should produce
 * hash values that are evenly distributed over a fairly large range.
 * The modulus is taken with the hash table size (a prime number) to
 * find the 'bucket' to place each key into. The function should also
 * be very fast, since it is called for each key lookup.
 *
 * Note that the hash functions provided by GLib have these qualities,
 * but are not particularly robust against manufactured keys that
 * cause hash collisions. Therefore, you should consider choosing
 * a more secure hash function when using a GHashTable with keys
 * that originate in untrusted data (such as HTTP requests).
 * Using g_str_hash() in that situation might make your application
 * vulerable to
 * [Algorithmic Complexity Attacks](https://lwn.net/Articles/474912/).
 *
 * The key to choosing a good hash is unpredictability.  Even
 * cryptographic hashes are very easy to find collisions for when the
 * remainder is taken modulo a somewhat predictable prime number.  There
 * must be an element of randomness that an attacker is unable to guess.
 *
 * Returns: the hash value corresponding to the key
 */

/**
 * GHFunc:
 * @key: a key
 * @value: the value corresponding to the key
 * @user_data: user data passed to g_hash_table_foreach()
 *
 * Specifies the type of the function passed to g_hash_table_foreach().
 * It is called with each key/value pair, together with the @user_data
 * parameter which is passed to g_hash_table_foreach().
 */

/**
 * GHRFunc:
 * @key: a key
 * @value: the value associated with the key
 * @user_data: user data passed to g_hash_table_remove()
 *
 * Specifies the type of the function passed to
 * g_hash_table_foreach_remove(). It is called with each key/value
 * pair, together with the @user_data parameter passed to
 * g_hash_table_foreach_remove(). It should return %TRUE if the
 * key/value pair should be removed from the #GHashTable.
 *
 * Returns: %TRUE if the key/value pair should be removed from the
 *     #GHashTable
 */

/**
 * GEqualFunc:
 * @a: a value
 * @b: a value to compare with
 *
 * Specifies the type of a function used to test two values for
 * equality. The function should return %TRUE if both values are equal
 * and %FALSE otherwise.
 *
 * Returns: %TRUE if @a = @b; %FALSE otherwise
 */

/**
 * GHashTableIter:
 *
 * A GHashTableIter structure represents an iterator that can be used
 * to iterate over the elements of a #GHashTable. GHashTableIter
 * structures are typically allocated on the stack and then initialized
 * with g_hash_table_iter_init().
 */

/**
 * g_hash_table_freeze:
 * @hash_table: a #GHashTable
 *
 * This function is deprecated and will be removed in the next major
 * release of GLib. It does nothing.
 */

/**
 * g_hash_table_thaw:
 * @hash_table: a #GHashTable
 *
 * This function is deprecated and will be removed in the next major
 * release of GLib. It does nothing.
 */

#define HASH_TABLE_MIN_SHIFT 3  /* 1 << 3 == 8 buckets */

#define UNUSED_HASH_VALUE 0
#define TOMBSTONE_HASH_VALUE 1
#define HASH_IS_UNUSED(h_) ((h_) == UNUSED_HASH_VALUE)
#define HASH_IS_TOMBSTONE(h_) ((h_) == TOMBSTONE_HASH_VALUE)
#define HASH_IS_REAL(h_) ((h_) >= 2)

struct _GHashTable
{
  gint             size;
  gint             mod;
  guint            mask;
  gint             nnodes;
  gint             noccupied;  /* nnodes + tombstones */

  gpointer        *keys;
  guint           *hashes;
  gpointer        *values;

  GHashFunc        hash_func;
  GEqualFunc       key_equal_func;
  gatomicrefcount  ref_count;
#ifndef G_DISABLE_ASSERT
  /*
   * Tracks the structure of the hash table, not its contents: is only
   * incremented when a node is added or removed (is not incremented
   * when the key or data of a node is modified).
   */
  int              version;
#endif
  GDestroyNotify   key_destroy_func;
  GDestroyNotify   value_destroy_func;
};

typedef struct
{
  GHashTable  *hash_table;
  gpointer     dummy1;
  gpointer     dummy2;
  int          position;
  gboolean     dummy3;
  int          version;
} RealIter;

G_STATIC_ASSERT (sizeof (GHashTableIter) == sizeof (RealIter));
G_STATIC_ASSERT (_g_alignof (GHashTableIter) >= _g_alignof (RealIter));

/* Each table size has an associated prime modulo (the first prime
 * lower than the table size) used to find the initial bucket. Probing
 * then works modulo 2^n. The prime modulo is necessary to get a
 * good distribution with poor hash functions.
 */
static const gint prime_mod [] =
{
  1,          /* For 1 << 0 */
  2,
  3,
  7,
  13,
  31,
  61,
  127,
  251,
  509,
  1021,
  2039,
  4093,
  8191,
  16381,
  32749,
  65521,      /* For 1 << 16 */
  131071,
  262139,
  524287,
  1048573,
  2097143,
  4194301,
  8388593,
  16777213,
  33554393,
  67108859,
  134217689,
  268435399,
  536870909,
  1073741789,
  2147483647  /* For 1 << 31 */
};

static void
g_hash_table_set_shift (GHashTable *hash_table, gint shift)
{
  gint i;
  guint mask = 0;

  hash_table->size = 1 << shift;
  hash_table->mod  = prime_mod [shift];

  for (i = 0; i < shift; i++)
    {
      mask <<= 1;
      mask |= 1;
    }

  hash_table->mask = mask;
}

static gint
g_hash_table_find_closest_shift (gint n)
{
  gint i;

  for (i = 0; n; i++)
    n >>= 1;

  return i;
}

static void
g_hash_table_set_shift_from_size (GHashTable *hash_table, gint size)
{
  gint shift;

  shift = g_hash_table_find_closest_shift (size);
  shift = MAX (shift, HASH_TABLE_MIN_SHIFT);

  g_hash_table_set_shift (hash_table, shift);
}

/*
 * g_hash_table_lookup_node:
 * @hash_table: our #GHashTable
 * @key: the key to lookup against
 * @hash_return: key hash return location
 *
 * Performs a lookup in the hash table, preserving extra information
 * usually needed for insertion.
 *
 * This function first computes the hash value of the key using the
 * user's hash function.
 *
 * If an entry in the table matching @key is found then this function
 * returns the index of that entry in the table, and if not, the
 * index of an unused node (empty or tombstone) where the key can be
 * inserted.
 *
 * The computed hash value is returned in the variable pointed to
 * by @hash_return. This is to save insertions from having to compute
 * the hash record again for the new record.
 *
 * Returns: index of the described node
 */
static inline guint
g_hash_table_lookup_node (GHashTable    *hash_table,
                          gconstpointer  key,
                          guint         *hash_return)
{
  guint node_index;
  guint node_hash;
  guint hash_value;
  guint first_tombstone = 0;
  gboolean have_tombstone = FALSE;
  guint step = 0;

  /* If this happens, then the application is probably doing too much work
   * from a destroy notifier. The alternative would be to crash any second
   * (as keys, etc. will be NULL).
   * Applications need to either use g_hash_table_destroy, or ensure the hash
   * table is empty prior to removing the last reference using g_hash_table_unref(). */
  g_assert (!g_atomic_ref_count_compare (&hash_table->ref_count, 0));

  hash_value = hash_table->hash_func (key);
  if (G_UNLIKELY (!HASH_IS_REAL (hash_value)))
    hash_value = 2;

  *hash_return = hash_value;

  node_index = hash_value % hash_table->mod;
  node_hash = hash_table->hashes[node_index];

  while (!HASH_IS_UNUSED (node_hash))
    {
      /* We first check if our full hash values
       * are equal so we can avoid calling the full-blown
       * key equality function in most cases.
       */
      if (node_hash == hash_value)
        {
          gpointer node_key = hash_table->keys[node_index];

          if (hash_table->key_equal_func)
            {
              if (hash_table->key_equal_func (node_key, key))
                return node_index;
            }
          else if (node_key == key)
            {
              return node_index;
            }
        }
      else if (HASH_IS_TOMBSTONE (node_hash) && !have_tombstone)
        {
          first_tombstone = node_index;
          have_tombstone = TRUE;
        }

      step++;
      node_index += step;
      node_index &= hash_table->mask;
      node_hash = hash_table->hashes[node_index];
    }

  if (have_tombstone)
    return first_tombstone;

  return node_index;
}

/*
 * g_hash_table_remove_node:
 * @hash_table: our #GHashTable
 * @node: pointer to node to remove
 * @notify: %TRUE if the destroy notify handlers are to be called
 *
 * Removes a node from the hash table and updates the node count.
 * The node is replaced by a tombstone. No table resize is performed.
 *
 * If @notify is %TRUE then the destroy notify functions are called
 * for the key and value of the hash node.
 */
static void
g_hash_table_remove_node (GHashTable   *hash_table,
                          gint          i,
                          gboolean      notify)
{
  gpointer key;
  gpointer value;

  key = hash_table->keys[i];
  value = hash_table->values[i];

  /* Erect tombstone */
  hash_table->hashes[i] = TOMBSTONE_HASH_VALUE;

  /* Be GC friendly */
  hash_table->keys[i] = NULL;
  hash_table->values[i] = NULL;

  hash_table->nnodes--;

  if (notify && hash_table->key_destroy_func)
    hash_table->key_destroy_func (key);

  if (notify && hash_table->value_destroy_func)
    hash_table->value_destroy_func (value);

}

/*
 * g_hash_table_remove_all_nodes:
 * @hash_table: our #GHashTable
 * @notify: %TRUE if the destroy notify handlers are to be called
 *
 * Removes all nodes from the table.  Since this may be a precursor to
 * freeing the table entirely, no resize is performed.
 *
 * If @notify is %TRUE then the destroy notify functions are called
 * for the key and value of the hash node.
 */
static void
g_hash_table_remove_all_nodes (GHashTable *hash_table,
                               gboolean    notify,
                               gboolean    destruction)
{
  int i;
  gpointer key;
  gpointer value;
  gint old_size;
  gpointer *old_keys;
  gpointer *old_values;
  guint    *old_hashes;

  /* If the hash table is already empty, there is nothing to be done. */
  if (hash_table->nnodes == 0)
    return;

  hash_table->nnodes = 0;
  hash_table->noccupied = 0;

  if (!notify ||
      (hash_table->key_destroy_func == NULL &&
       hash_table->value_destroy_func == NULL))
    {
      if (!destruction)
        {
          memset (hash_table->hashes, 0, hash_table->size * sizeof (guint));
          memset (hash_table->keys, 0, hash_table->size * sizeof (gpointer));
          memset (hash_table->values, 0, hash_table->size * sizeof (gpointer));
        }

      return;
    }

  /* Keep the old storage space around to iterate over it. */
  old_size = hash_table->size;
  old_keys   = hash_table->keys;
  old_values = hash_table->values;
  old_hashes = hash_table->hashes;

  /* Now create a new storage space; If the table is destroyed we can use the
   * shortcut of not creating a new storage. This saves the allocation at the
   * cost of not allowing any recursive access.
   * However, the application doesn't own any reference anymore, so access
   * is not allowed. If accesses are done, then either an assert or crash
   * *will* happen. */
  g_hash_table_set_shift (hash_table, HASH_TABLE_MIN_SHIFT);
  if (!destruction)
    {
      hash_table->keys   = g_new0 (gpointer, hash_table->size);
      hash_table->values = hash_table->keys;
      hash_table->hashes = g_new0 (guint, hash_table->size);
    }
  else
    {
      hash_table->keys   = NULL;
      hash_table->values = NULL;
      hash_table->hashes = NULL;
    }

  for (i = 0; i < old_size; i++)
    {
      if (HASH_IS_REAL (old_hashes[i]))
        {
          key = old_keys[i];
          value = old_values[i];

          old_hashes[i] = UNUSED_HASH_VALUE;
          old_keys[i] = NULL;
          old_values[i] = NULL;

          if (hash_table->key_destroy_func != NULL)
            hash_table->key_destroy_func (key);

          if (hash_table->value_destroy_func != NULL)
            hash_table->value_destroy_func (value);
        }
    }

  /* Destroy old storage space. */
  if (old_keys != old_values)
    g_free (old_values);

  g_free (old_keys);
  g_free (old_hashes);
}

/*
 * g_hash_table_resize:
 * @hash_table: our #GHashTable
 *
 * Resizes the hash table to the optimal size based on the number of
 * nodes currently held. If you call this function then a resize will
 * occur, even if one does not need to occur.
 * Use g_hash_table_maybe_resize() instead.
 *
 * This function may "resize" the hash table to its current size, with
 * the side effect of cleaning up tombstones and otherwise optimizing
 * the probe sequences.
 */
static void
g_hash_table_resize (GHashTable *hash_table)
{
  gpointer *new_keys;
  gpointer *new_values;
  guint *new_hashes;
  gint old_size;
  gint i;

  old_size = hash_table->size;
  g_hash_table_set_shift_from_size (hash_table, hash_table->nnodes * 2);

  new_keys = g_new0 (gpointer, hash_table->size);
  if (hash_table->keys == hash_table->values)
    new_values = new_keys;
  else
    new_values = g_new0 (gpointer, hash_table->size);
  new_hashes = g_new0 (guint, hash_table->size);

  for (i = 0; i < old_size; i++)
    {
      guint node_hash = hash_table->hashes[i];
      guint hash_val;
      guint step = 0;

      if (!HASH_IS_REAL (node_hash))
        continue;

      hash_val = node_hash % hash_table->mod;

      while (!HASH_IS_UNUSED (new_hashes[hash_val]))
        {
          step++;
          hash_val += step;
          hash_val &= hash_table->mask;
        }

      new_hashes[hash_val] = hash_table->hashes[i];
      new_keys[hash_val] = hash_table->keys[i];
      new_values[hash_val] = hash_table->values[i];
    }

  if (hash_table->keys != hash_table->values)
    g_free (hash_table->values);

  g_free (hash_table->keys);
  g_free (hash_table->hashes);

  hash_table->keys = new_keys;
  hash_table->values = new_values;
  hash_table->hashes = new_hashes;

  hash_table->noccupied = hash_table->nnodes;
}

/*
 * g_hash_table_maybe_resize:
 * @hash_table: our #GHashTable
 *
 * Resizes the hash table, if needed.
 *
 * Essentially, calls g_hash_table_resize() if the table has strayed
 * too far from its ideal size for its number of nodes.
 */
static inline void
g_hash_table_maybe_resize (GHashTable *hash_table)
{
  gint noccupied = hash_table->noccupied;
  gint size = hash_table->size;

  if ((size > hash_table->nnodes * 4 && size > 1 << HASH_TABLE_MIN_SHIFT) ||
      (size <= noccupied + (noccupied / 16)))
    g_hash_table_resize (hash_table);
}

/**
 * g_hash_table_new:
 * @hash_func: a function to create a hash value from a key
 * @key_equal_func: a function to check two keys for equality
 *
 * Creates a new #GHashTable with a reference count of 1.
 *
 * Hash values returned by @hash_func are used to determine where keys
 * are stored within the #GHashTable data structure. The g_direct_hash(),
 * g_int_hash(), g_int64_hash(), g_double_hash() and g_str_hash()
 * functions are provided for some common types of keys.
 * If @hash_func is %NULL, g_direct_hash() is used.
 *
 * @key_equal_func is used when looking up keys in the #GHashTable.
 * The g_direct_equal(), g_int_equal(), g_int64_equal(), g_double_equal()
 * and g_str_equal() functions are provided for the most common types
 * of keys. If @key_equal_func is %NULL, keys are compared directly in
 * a similar fashion to g_direct_equal(), but without the overhead of
 * a function call. @key_equal_func is called with the key from the hash table
 * as its first parameter, and the user-provided key to check against as
 * its second.
 *
 * Returns: a new #GHashTable
 */
GHashTable *
g_hash_table_new (GHashFunc  hash_func,
                  GEqualFunc key_equal_func)
{
  return g_hash_table_new_full (hash_func, key_equal_func, NULL, NULL);
}


/**
 * g_hash_table_new_full:
 * @hash_func: a function to create a hash value from a key
 * @key_equal_func: a function to check two keys for equality
 * @key_destroy_func: (nullable): a function to free the memory allocated for the key
 *     used when removing the entry from the #GHashTable, or %NULL
 *     if you don't want to supply such a function.
 * @value_destroy_func: (nullable): a function to free the memory allocated for the
 *     value used when removing the entry from the #GHashTable, or %NULL
 *     if you don't want to supply such a function.
 *
 * Creates a new #GHashTable like g_hash_table_new() with a reference
 * count of 1 and allows to specify functions to free the memory
 * allocated for the key and value that get called when removing the
 * entry from the #GHashTable.
 *
 * Since version 2.42 it is permissible for destroy notify functions to
 * recursively remove further items from the hash table. This is only
 * permissible if the application still holds a reference to the hash table.
 * This means that you may need to ensure that the hash table is empty by
 * calling g_hash_table_remove_all() before releasing the last reference using
 * g_hash_table_unref().
 *
 * Returns: a new #GHashTable
 */
GHashTable *
g_hash_table_new_full (GHashFunc      hash_func,
                       GEqualFunc     key_equal_func,
                       GDestroyNotify key_destroy_func,
                       GDestroyNotify value_destroy_func)
{
  GHashTable *hash_table;

  hash_table = g_slice_new (GHashTable);
  g_hash_table_set_shift (hash_table, HASH_TABLE_MIN_SHIFT);
  g_atomic_ref_count_init (&hash_table->ref_count);
  hash_table->nnodes             = 0;
  hash_table->noccupied          = 0;
  hash_table->hash_func          = hash_func ? hash_func : g_direct_hash;
  hash_table->key_equal_func     = key_equal_func;
#ifndef G_DISABLE_ASSERT
  hash_table->version            = 0;
#endif
  hash_table->key_destroy_func   = key_destroy_func;
  hash_table->value_destroy_func = value_destroy_func;
  hash_table->keys               = g_new0 (gpointer, hash_table->size);
  hash_table->values             = hash_table->keys;
  hash_table->hashes             = g_new0 (guint, hash_table->size);

  return hash_table;
}

/**
 * g_hash_table_iter_init:
 * @iter: an uninitialized #GHashTableIter
 * @hash_table: a #GHashTable
 *
 * Initializes a key/value pair iterator and associates it with
 * @hash_table. Modifying the hash table after calling this function
 * invalidates the returned iterator.
 * |[<!-- language="C" -->
 * GHashTableIter iter;
 * gpointer key, value;
 *
 * g_hash_table_iter_init (&iter, hash_table);
 * while (g_hash_table_iter_next (&iter, &key, &value))
 *   {
 *     // do something with key and value
 *   }
 * ]|
 *
 * Since: 2.16
 */
void
g_hash_table_iter_init (GHashTableIter *iter,
                        GHashTable     *hash_table)
{
  RealIter *ri = (RealIter *) iter;

  g_return_if_fail (iter != NULL);
  g_return_if_fail (hash_table != NULL);

  ri->hash_table = hash_table;
  ri->position = -1;
#ifndef G_DISABLE_ASSERT
  ri->version = hash_table->version;
#endif
}

/**
 * g_hash_table_iter_next:
 * @iter: an initialized #GHashTableIter
 * @key: (out) (optional): a location to store the key
 * @value: (out) (optional) (nullable): a location to store the value
 *
 * Advances @iter and retrieves the key and/or value that are now
 * pointed to as a result of this advancement. If %FALSE is returned,
 * @key and @value are not set, and the iterator becomes invalid.
 *
 * Returns: %FALSE if the end of the #GHashTable has been reached.
 *
 * Since: 2.16
 */
gboolean
g_hash_table_iter_next (GHashTableIter *iter,
                        gpointer       *key,
                        gpointer       *value)
{
  RealIter *ri = (RealIter *) iter;
  gint position;

  g_return_val_if_fail (iter != NULL, FALSE);
#ifndef G_DISABLE_ASSERT
  g_return_val_if_fail (ri->version == ri->hash_table->version, FALSE);
#endif
  g_return_val_if_fail (ri->position < ri->hash_table->size, FALSE);

  position = ri->position;

  do
    {
      position++;
      if (position >= ri->hash_table->size)
        {
          ri->position = position;
          return FALSE;
        }
    }
  while (!HASH_IS_REAL (ri->hash_table->hashes[position]));

  if (key != NULL)
    *key = ri->hash_table->keys[position];
  if (value != NULL)
    *value = ri->hash_table->values[position];

  ri->position = position;
  return TRUE;
}

/**
 * g_hash_table_iter_get_hash_table:
 * @iter: an initialized #GHashTableIter
 *
 * Returns the #GHashTable associated with @iter.
 *
 * Returns: the #GHashTable associated with @iter.
 *
 * Since: 2.16
 */
GHashTable *
g_hash_table_iter_get_hash_table (GHashTableIter *iter)
{
  g_return_val_if_fail (iter != NULL, NULL);

  return ((RealIter *) iter)->hash_table;
}

static void
iter_remove_or_steal (RealIter *ri, gboolean notify)
{
  g_return_if_fail (ri != NULL);
#ifndef G_DISABLE_ASSERT
  g_return_if_fail (ri->version == ri->hash_table->version);
#endif
  g_return_if_fail (ri->position >= 0);
  g_return_if_fail (ri->position < ri->hash_table->size);

  g_hash_table_remove_node (ri->hash_table, ri->position, notify);

#ifndef G_DISABLE_ASSERT
  ri->version++;
  ri->hash_table->version++;
#endif
}

/**
 * g_hash_table_iter_remove:
 * @iter: an initialized #GHashTableIter
 *
 * Removes the key/value pair currently pointed to by the iterator
 * from its associated #GHashTable. Can only be called after
 * g_hash_table_iter_next() returned %TRUE, and cannot be called
 * more than once for the same key/value pair.
 *
 * If the #GHashTable was created using g_hash_table_new_full(),
 * the key and value are freed using the supplied destroy functions,
 * otherwise you have to make sure that any dynamically allocated
 * values are freed yourself.
 *
 * It is safe to continue iterating the #GHashTable afterward:
 * |[<!-- language="C" -->
 * while (g_hash_table_iter_next (&iter, &key, &value))
 *   {
 *     if (condition)
 *       g_hash_table_iter_remove (&iter);
 *   }
 * ]|
 *
 * Since: 2.16
 */
void
g_hash_table_iter_remove (GHashTableIter *iter)
{
  iter_remove_or_steal ((RealIter *) iter, TRUE);
}

/*
 * g_hash_table_insert_node:
 * @hash_table: our #GHashTable
 * @node_index: pointer to node to insert/replace
 * @key_hash: key hash
 * @key: (nullable): key to replace with, or %NULL
 * @value: value to replace with
 * @keep_new_key: whether to replace the key in the node with @key
 * @reusing_key: whether @key was taken out of the existing node
 *
 * Inserts a value at @node_index in the hash table and updates it.
 *
 * If @key has been taken out of the existing node (ie it is not
 * passed in via a g_hash_table_insert/replace) call, then @reusing_key
 * should be %TRUE.
 *
 * Returns: %TRUE if the key did not exist yet
 */
static gboolean
g_hash_table_insert_node (GHashTable *hash_table,
                          guint       node_index,
                          guint       key_hash,
                          gpointer    new_key,
                          gpointer    new_value,
                          gboolean    keep_new_key,
                          gboolean    reusing_key)
{
  gboolean already_exists;
  guint old_hash;
  gpointer key_to_free = NULL;
  gpointer value_to_free = NULL;

  old_hash = hash_table->hashes[node_index];
  already_exists = HASH_IS_REAL (old_hash);

  /* Proceed in three steps.  First, deal with the key because it is the
   * most complicated.  Then consider if we need to split the table in
   * two (because writing the value will result in the set invariant
   * becoming broken).  Then deal with the value.
   *
   * There are three cases for the key:
   *
   *  - entry already exists in table, reusing key:
   *    free the just-passed-in new_key and use the existing value
   *
   *  - entry already exists in table, not reusing key:
   *    free the entry in the table, use the new key
   *
   *  - entry not already in table:
   *    use the new key, free nothing
   *
   * We update the hash at the same time...
   */
  if (already_exists)
    {
      /* Note: we must record the old value before writing the new key
       * because we might change the value in the event that the two
       * arrays are shared.
       */
      value_to_free = hash_table->values[node_index];

      if (keep_new_key)
        {
          key_to_free = hash_table->keys[node_index];
          hash_table->keys[node_index] = new_key;
        }
      else
        key_to_free = new_key;
    }
  else
    {
      hash_table->hashes[node_index] = key_hash;
      hash_table->keys[node_index] = new_key;
    }

  /* Step two: check if the value that we are about to write to the
   * table is the same as the key in the same position.  If it's not,
   * split the table.
   */
  if (G_UNLIKELY (hash_table->keys == hash_table->values && hash_table->keys[node_index] != new_value))
    hash_table->values = g_memdup (hash_table->keys, sizeof (gpointer) * hash_table->size);

  /* Step 3: Actually do the write */
  hash_table->values[node_index] = new_value;

  /* Now, the bookkeeping... */
  if (!already_exists)
    {
      hash_table->nnodes++;

      if (HASH_IS_UNUSED (old_hash))
        {
          /* We replaced an empty node, and not a tombstone */
          hash_table->noccupied++;
          g_hash_table_maybe_resize (hash_table);
        }

#ifndef G_DISABLE_ASSERT
      hash_table->version++;
#endif
    }

  if (already_exists)
    {
      if (hash_table->key_destroy_func && !reusing_key)
        (* hash_table->key_destroy_func) (key_to_free);
      if (hash_table->value_destroy_func)
        (* hash_table->value_destroy_func) (value_to_free);
    }

  return !already_exists;
}

/**
 * g_hash_table_iter_replace:
 * @iter: an initialized #GHashTableIter
 * @value: the value to replace with
 *
 * Replaces the value currently pointed to by the iterator
 * from its associated #GHashTable. Can only be called after
 * g_hash_table_iter_next() returned %TRUE.
 *
 * If you supplied a @value_destroy_func when creating the
 * #GHashTable, the old value is freed using that function.
 *
 * Since: 2.30
 */
void
g_hash_table_iter_replace (GHashTableIter *iter,
                           gpointer        value)
{
  RealIter *ri;
  guint node_hash;
  gpointer key;

  ri = (RealIter *) iter;

  g_return_if_fail (ri != NULL);
#ifndef G_DISABLE_ASSERT
  g_return_if_fail (ri->version == ri->hash_table->version);
#endif
  g_return_if_fail (ri->position >= 0);
  g_return_if_fail (ri->position < ri->hash_table->size);

  node_hash = ri->hash_table->hashes[ri->position];
  key = ri->hash_table->keys[ri->position];

  g_hash_table_insert_node (ri->hash_table, ri->position, node_hash, key, value, TRUE, TRUE);

#ifndef G_DISABLE_ASSERT
  ri->version++;
  ri->hash_table->version++;
#endif
}

/**
 * g_hash_table_iter_steal:
 * @iter: an initialized #GHashTableIter
 *
 * Removes the key/value pair currently pointed to by the
 * iterator from its associated #GHashTable, without calling
 * the key and value destroy functions. Can only be called
 * after g_hash_table_iter_next() returned %TRUE, and cannot
 * be called more than once for the same key/value pair.
 *
 * Since: 2.16
 */
void
g_hash_table_iter_steal (GHashTableIter *iter)
{
  iter_remove_or_steal ((RealIter *) iter, FALSE);
}


/**
 * g_hash_table_ref:
 * @hash_table: a valid #GHashTable
 *
 * Atomically increments the reference count of @hash_table by one.
 * This function is MT-safe and may be called from any thread.
 *
 * Returns: the passed in #GHashTable
 *
 * Since: 2.10
 */
GHashTable *
g_hash_table_ref (GHashTable *hash_table)
{
  g_return_val_if_fail (hash_table != NULL, NULL);

  g_atomic_ref_count_inc (&hash_table->ref_count);

  return hash_table;
}

/**
 * g_hash_table_unref:
 * @hash_table: a valid #GHashTable
 *
 * Atomically decrements the reference count of @hash_table by one.
 * If the reference count drops to 0, all keys and values will be
 * destroyed, and all memory allocated by the hash table is released.
 * This function is MT-safe and may be called from any thread.
 *
 * Since: 2.10
 */
void
g_hash_table_unref (GHashTable *hash_table)
{
  g_return_if_fail (hash_table != NULL);

  if (g_atomic_ref_count_dec (&hash_table->ref_count))
    {
      g_hash_table_remove_all_nodes (hash_table, TRUE, TRUE);
      if (hash_table->keys != hash_table->values)
        g_free (hash_table->values);
      g_free (hash_table->keys);
      g_free (hash_table->hashes);
      g_slice_free (GHashTable, hash_table);
    }
}

/**
 * g_hash_table_destroy:
 * @hash_table: a #GHashTable
 *
 * Destroys all keys and values in the #GHashTable and decrements its
 * reference count by 1. If keys and/or values are dynamically allocated,
 * you should either free them first or create the #GHashTable with destroy
 * notifiers using g_hash_table_new_full(). In the latter case the destroy
 * functions you supplied will be called on all keys and values during the
 * destruction phase.
 */
void
g_hash_table_destroy (GHashTable *hash_table)
{
  g_return_if_fail (hash_table != NULL);

  g_hash_table_remove_all (hash_table);
  g_hash_table_unref (hash_table);
}

/**
 * g_hash_table_lookup:
 * @hash_table: a #GHashTable
 * @key: the key to look up
 *
 * Looks up a key in a #GHashTable. Note that this function cannot
 * distinguish between a key that is not present and one which is present
 * and has the value %NULL. If you need this distinction, use
 * g_hash_table_lookup_extended().
 *
 * Returns: (nullable): the associated value, or %NULL if the key is not found
 */
gpointer
g_hash_table_lookup (GHashTable    *hash_table,
                     gconstpointer  key)
{
  guint node_index;
  guint node_hash;

  g_return_val_if_fail (hash_table != NULL, NULL);

  node_index = g_hash_table_lookup_node (hash_table, key, &node_hash);

  return HASH_IS_REAL (hash_table->hashes[node_index])
    ? hash_table->values[node_index]
    : NULL;
}

/**
 * g_hash_table_lookup_extended:
 * @hash_table: a #GHashTable
 * @lookup_key: the key to look up
 * @orig_key: (out) (optional): return location for the original key
 * @value: (out) (optional) (nullable): return location for the value associated
 * with the key
 *
 * Looks up a key in the #GHashTable, returning the original key and the
 * associated value and a #gboolean which is %TRUE if the key was found. This
 * is useful if you need to free the memory allocated for the original key,
 * for example before calling g_hash_table_remove().
 *
 * You can actually pass %NULL for @lookup_key to test
 * whether the %NULL key exists, provided the hash and equal functions
 * of @hash_table are %NULL-safe.
 *
 * Returns: %TRUE if the key was found in the #GHashTable
 */
gboolean
g_hash_table_lookup_extended (GHashTable    *hash_table,
                              gconstpointer  lookup_key,
                              gpointer      *orig_key,
                              gpointer      *value)
{
  guint node_index;
  guint node_hash;

  g_return_val_if_fail (hash_table != NULL, FALSE);

  node_index = g_hash_table_lookup_node (hash_table, lookup_key, &node_hash);

  if (!HASH_IS_REAL (hash_table->hashes[node_index]))
    return FALSE;

  if (orig_key)
    *orig_key = hash_table->keys[node_index];

  if (value)
    *value = hash_table->values[node_index];

  return TRUE;
}

/*
 * g_hash_table_insert_internal:
 * @hash_table: our #GHashTable
 * @key: the key to insert
 * @value: the value to insert
 * @keep_new_key: if %TRUE and this key already exists in the table
 *   then call the destroy notify function on the old key.  If %FALSE
 *   then call the destroy notify function on the new key.
 *
 * Implements the common logic for the g_hash_table_insert() and
 * g_hash_table_replace() functions.
 *
 * Do a lookup of @key. If it is found, replace it with the new
 * @value (and perhaps the new @key). If it is not found, create
 * a new node.
 *
 * Returns: %TRUE if the key did not exist yet
 */
static gboolean
g_hash_table_insert_internal (GHashTable *hash_table,
                              gpointer    key,
                              gpointer    value,
                              gboolean    keep_new_key)
{
  guint key_hash;
  guint node_index;

  g_return_val_if_fail (hash_table != NULL, FALSE);

  node_index = g_hash_table_lookup_node (hash_table, key, &key_hash);

  return g_hash_table_insert_node (hash_table, node_index, key_hash, key, value, keep_new_key, FALSE);
}

/**
 * g_hash_table_insert:
 * @hash_table: a #GHashTable
 * @key: a key to insert
 * @value: the value to associate with the key
 *
 * Inserts a new key and value into a #GHashTable.
 *
 * If the key already exists in the #GHashTable its current
 * value is replaced with the new value. If you supplied a
 * @value_destroy_func when creating the #GHashTable, the old
 * value is freed using that function. If you supplied a
 * @key_destroy_func when creating the #GHashTable, the passed
 * key is freed using that function.
 *
 * Starting from GLib 2.40, this function returns a boolean value to
 * indicate whether the newly added value was already in the hash table
 * or not.
 *
 * Returns: %TRUE if the key did not exist yet
 */
gboolean
g_hash_table_insert (GHashTable *hash_table,
                     gpointer    key,
                     gpointer    value)
{
  return g_hash_table_insert_internal (hash_table, key, value, FALSE);
}

/**
 * g_hash_table_replace:
 * @hash_table: a #GHashTable
 * @key: a key to insert
 * @value: the value to associate with the key
 *
 * Inserts a new key and value into a #GHashTable similar to
 * g_hash_table_insert(). The difference is that if the key
 * already exists in the #GHashTable, it gets replaced by the
 * new key. If you supplied a @value_destroy_func when creating
 * the #GHashTable, the old value is freed using that function.
 * If you supplied a @key_destroy_func when creating the
 * #GHashTable, the old key is freed using that function.
 *
 * Starting from GLib 2.40, this function returns a boolean value to
 * indicate whether the newly added value was already in the hash table
 * or not.
 *
 * Returns: %TRUE if the key did not exist yet
 */
gboolean
g_hash_table_replace (GHashTable *hash_table,
                      gpointer    key,
                      gpointer    value)
{
  return g_hash_table_insert_internal (hash_table, key, value, TRUE);
}

/**
 * g_hash_table_add:
 * @hash_table: a #GHashTable
 * @key: a key to insert
 *
 * This is a convenience function for using a #GHashTable as a set.  It
 * is equivalent to calling g_hash_table_replace() with @key as both the
 * key and the value.
 *
 * When a hash table only ever contains keys that have themselves as the
 * corresponding value it is able to be stored more efficiently.  See
 * the discussion in the section description.
 *
 * Starting from GLib 2.40, this function returns a boolean value to
 * indicate whether the newly added value was already in the hash table
 * or not.
 *
 * Returns: %TRUE if the key did not exist yet
 *
 * Since: 2.32
 */
gboolean
g_hash_table_add (GHashTable *hash_table,
                  gpointer    key)
{
  return g_hash_table_insert_internal (hash_table, key, key, TRUE);
}

/**
 * g_hash_table_contains:
 * @hash_table: a #GHashTable
 * @key: a key to check
 *
 * Checks if @key is in @hash_table.
 *
 * Returns: %TRUE if @key is in @hash_table, %FALSE otherwise.
 *
 * Since: 2.32
 **/
gboolean
g_hash_table_contains (GHashTable    *hash_table,
                       gconstpointer  key)
{
  guint node_index;
  guint node_hash;

  g_return_val_if_fail (hash_table != NULL, FALSE);

  node_index = g_hash_table_lookup_node (hash_table, key, &node_hash);

  return HASH_IS_REAL (hash_table->hashes[node_index]);
}

/*
 * g_hash_table_remove_internal:
 * @hash_table: our #GHashTable
 * @key: the key to remove
 * @notify: %TRUE if the destroy notify handlers are to be called
 * Returns: %TRUE if a node was found and removed, else %FALSE
 *
 * Implements the common logic for the g_hash_table_remove() and
 * g_hash_table_steal() functions.
 *
 * Do a lookup of @key and remove it if it is found, calling the
 * destroy notify handlers only if @notify is %TRUE.
 */
static gboolean
g_hash_table_remove_internal (GHashTable    *hash_table,
                              gconstpointer  key,
                              gboolean       notify)
{
  guint node_index;
  guint node_hash;

  g_return_val_if_fail (hash_table != NULL, FALSE);

  node_index = g_hash_table_lookup_node (hash_table, key, &node_hash);

  if (!HASH_IS_REAL (hash_table->hashes[node_index]))
    return FALSE;

  g_hash_table_remove_node (hash_table, node_index, notify);
  g_hash_table_maybe_resize (hash_table);

#ifndef G_DISABLE_ASSERT
  hash_table->version++;
#endif

  return TRUE;
}

/**
 * g_hash_table_remove:
 * @hash_table: a #GHashTable
 * @key: the key to remove
 *
 * Removes a key and its associated value from a #GHashTable.
 *
 * If the #GHashTable was created using g_hash_table_new_full(), the
 * key and value are freed using the supplied destroy functions, otherwise
 * you have to make sure that any dynamically allocated values are freed
 * yourself.
 *
 * Returns: %TRUE if the key was found and removed from the #GHashTable
 */
gboolean
g_hash_table_remove (GHashTable    *hash_table,
                     gconstpointer  key)
{
  return g_hash_table_remove_internal (hash_table, key, TRUE);
}

/**
 * g_hash_table_steal:
 * @hash_table: a #GHashTable
 * @key: the key to remove
 *
 * Removes a key and its associated value from a #GHashTable without
 * calling the key and value destroy functions.
 *
 * Returns: %TRUE if the key was found and removed from the #GHashTable
 */
gboolean
g_hash_table_steal (GHashTable    *hash_table,
                    gconstpointer  key)
{
  return g_hash_table_remove_internal (hash_table, key, FALSE);
}

/**
 * g_hash_table_steal_extended:
 * @hash_table: a #GHashTable
 * @lookup_key: the key to look up
 * @stolen_key: (out) (optional) (transfer full): return location for the
 *    original key
 * @stolen_value: (out) (optional) (nullable) (transfer full): return location
 *    for the value associated with the key
 *
 * Looks up a key in the #GHashTable, stealing the original key and the
 * associated value and returning %TRUE if the key was found. If the key was
 * not found, %FALSE is returned.
 *
 * If found, the stolen key and value are removed from the hash table without
 * calling the key and value destroy functions, and ownership is transferred to
 * the caller of this method; as with g_hash_table_steal().
 *
 * You can pass %NULL for @lookup_key, provided the hash and equal functions
 * of @hash_table are %NULL-safe.
 *
 * Returns: %TRUE if the key was found in the #GHashTable
 * Since: 2.58
 */
gboolean
g_hash_table_steal_extended (GHashTable    *hash_table,
                             gconstpointer  lookup_key,
                             gpointer      *stolen_key,
                             gpointer      *stolen_value)
{
  guint node_index;
  guint node_hash;

  g_return_val_if_fail (hash_table != NULL, FALSE);

  node_index = g_hash_table_lookup_node (hash_table, lookup_key, &node_hash);

  if (!HASH_IS_REAL (hash_table->hashes[node_index]))
    {
      if (stolen_key != NULL)
        *stolen_key = NULL;
      if (stolen_value != NULL)
        *stolen_value = NULL;
      return FALSE;
    }

  if (stolen_key != NULL)
    *stolen_key = g_steal_pointer (&hash_table->keys[node_index]);

  if (stolen_value != NULL)
    *stolen_value = g_steal_pointer (&hash_table->values[node_index]);

  g_hash_table_remove_node (hash_table, node_index, FALSE);
  g_hash_table_maybe_resize (hash_table);

#ifndef G_DISABLE_ASSERT
  hash_table->version++;
#endif

  return TRUE;
}

/**
 * g_hash_table_remove_all:
 * @hash_table: a #GHashTable
 *
 * Removes all keys and their associated values from a #GHashTable.
 *
 * If the #GHashTable was created using g_hash_table_new_full(),
 * the keys and values are freed using the supplied destroy functions,
 * otherwise you have to make sure that any dynamically allocated
 * values are freed yourself.
 *
 * Since: 2.12
 */
void
g_hash_table_remove_all (GHashTable *hash_table)
{
  g_return_if_fail (hash_table != NULL);

#ifndef G_DISABLE_ASSERT
  if (hash_table->nnodes != 0)
    hash_table->version++;
#endif

  g_hash_table_remove_all_nodes (hash_table, TRUE, FALSE);
  g_hash_table_maybe_resize (hash_table);
}

/**
 * g_hash_table_steal_all:
 * @hash_table: a #GHashTable
 *
 * Removes all keys and their associated values from a #GHashTable
 * without calling the key and value destroy functions.
 *
 * Since: 2.12
 */
void
g_hash_table_steal_all (GHashTable *hash_table)
{
  g_return_if_fail (hash_table != NULL);

#ifndef G_DISABLE_ASSERT
  if (hash_table->nnodes != 0)
    hash_table->version++;
#endif

  g_hash_table_remove_all_nodes (hash_table, FALSE, FALSE);
  g_hash_table_maybe_resize (hash_table);
}

/*
 * g_hash_table_foreach_remove_or_steal:
 * @hash_table: a #GHashTable
 * @func: the user's callback function
 * @user_data: data for @func
 * @notify: %TRUE if the destroy notify handlers are to be called
 *
 * Implements the common logic for g_hash_table_foreach_remove()
 * and g_hash_table_foreach_steal().
 *
 * Iterates over every node in the table, calling @func with the key
 * and value of the node (and @user_data). If @func returns %TRUE the
 * node is removed from the table.
 *
 * If @notify is true then the destroy notify handlers will be called
 * for each removed node.
 */
static guint
g_hash_table_foreach_remove_or_steal (GHashTable *hash_table,
                                      GHRFunc     func,
                                      gpointer    user_data,
                                      gboolean    notify)
{
  guint deleted = 0;
  gint i;
#ifndef G_DISABLE_ASSERT
  gint version = hash_table->version;
#endif

  for (i = 0; i < hash_table->size; i++)
    {
      guint node_hash = hash_table->hashes[i];
      gpointer node_key = hash_table->keys[i];
      gpointer node_value = hash_table->values[i];

      if (HASH_IS_REAL (node_hash) &&
          (* func) (node_key, node_value, user_data))
        {
          g_hash_table_remove_node (hash_table, i, notify);
          deleted++;
        }

#ifndef G_DISABLE_ASSERT
      g_return_val_if_fail (version == hash_table->version, 0);
#endif
    }

  g_hash_table_maybe_resize (hash_table);

#ifndef G_DISABLE_ASSERT
  if (deleted > 0)
    hash_table->version++;
#endif

  return deleted;
}

/**
 * g_hash_table_foreach_remove:
 * @hash_table: a #GHashTable
 * @func: the function to call for each key/value pair
 * @user_data: user data to pass to the function
 *
 * Calls the given function for each key/value pair in the
 * #GHashTable. If the function returns %TRUE, then the key/value
 * pair is removed from the #GHashTable. If you supplied key or
 * value destroy functions when creating the #GHashTable, they are
 * used to free the memory allocated for the removed keys and values.
 *
 * See #GHashTableIter for an alternative way to loop over the
 * key/value pairs in the hash table.
 *
 * Returns: the number of key/value pairs removed
 */
guint
g_hash_table_foreach_remove (GHashTable *hash_table,
                             GHRFunc     func,
                             gpointer    user_data)
{
  g_return_val_if_fail (hash_table != NULL, 0);
  g_return_val_if_fail (func != NULL, 0);

  return g_hash_table_foreach_remove_or_steal (hash_table, func, user_data, TRUE);
}

/**
 * g_hash_table_foreach_steal:
 * @hash_table: a #GHashTable
 * @func: the function to call for each key/value pair
 * @user_data: user data to pass to the function
 *
 * Calls the given function for each key/value pair in the
 * #GHashTable. If the function returns %TRUE, then the key/value
 * pair is removed from the #GHashTable, but no key or value
 * destroy functions are called.
 *
 * See #GHashTableIter for an alternative way to loop over the
 * key/value pairs in the hash table.
 *
 * Returns: the number of key/value pairs removed.
 */
guint
g_hash_table_foreach_steal (GHashTable *hash_table,
                            GHRFunc     func,
                            gpointer    user_data)
{
  g_return_val_if_fail (hash_table != NULL, 0);
  g_return_val_if_fail (func != NULL, 0);

  return g_hash_table_foreach_remove_or_steal (hash_table, func, user_data, FALSE);
}

/**
 * g_hash_table_foreach:
 * @hash_table: a #GHashTable
 * @func: the function to call for each key/value pair
 * @user_data: user data to pass to the function
 *
 * Calls the given function for each of the key/value pairs in the
 * #GHashTable.  The function is passed the key and value of each
 * pair, and the given @user_data parameter.  The hash table may not
 * be modified while iterating over it (you can't add/remove
 * items). To remove all items matching a predicate, use
 * g_hash_table_foreach_remove().
 *
 * See g_hash_table_find() for performance caveats for linear
 * order searches in contrast to g_hash_table_lookup().
 */
void
g_hash_table_foreach (GHashTable *hash_table,
                      GHFunc      func,
                      gpointer    user_data)
{
  gint i;
#ifndef G_DISABLE_ASSERT
  gint version;
#endif

  g_return_if_fail (hash_table != NULL);
  g_return_if_fail (func != NULL);

#ifndef G_DISABLE_ASSERT
  version = hash_table->version;
#endif

  for (i = 0; i < hash_table->size; i++)
    {
      guint node_hash = hash_table->hashes[i];
      gpointer node_key = hash_table->keys[i];
      gpointer node_value = hash_table->values[i];

      if (HASH_IS_REAL (node_hash))
        (* func) (node_key, node_value, user_data);

#ifndef G_DISABLE_ASSERT
      g_return_if_fail (version == hash_table->version);
#endif
    }
}

/**
 * g_hash_table_find:
 * @hash_table: a #GHashTable
 * @predicate: function to test the key/value pairs for a certain property
 * @user_data: user data to pass to the function
 *
 * Calls the given function for key/value pairs in the #GHashTable
 * until @predicate returns %TRUE. The function is passed the key
 * and value of each pair, and the given @user_data parameter. The
 * hash table may not be modified while iterating over it (you can't
 * add/remove items).
 *
 * Note, that hash tables are really only optimized for forward
 * lookups, i.e. g_hash_table_lookup(). So code that frequently issues
 * g_hash_table_find() or g_hash_table_foreach() (e.g. in the order of
 * once per every entry in a hash table) should probably be reworked
 * to use additional or different data structures for reverse lookups
 * (keep in mind that an O(n) find/foreach operation issued for all n
 * values in a hash table ends up needing O(n*n) operations).
 *
 * Returns: (nullable): The value of the first key/value pair is returned,
 *     for which @predicate evaluates to %TRUE. If no pair with the
 *     requested property is found, %NULL is returned.
 *
 * Since: 2.4
 */
gpointer
g_hash_table_find (GHashTable *hash_table,
                   GHRFunc     predicate,
                   gpointer    user_data)
{
  gint i;
#ifndef G_DISABLE_ASSERT
  gint version;
#endif
  gboolean match;

  g_return_val_if_fail (hash_table != NULL, NULL);
  g_return_val_if_fail (predicate != NULL, NULL);

#ifndef G_DISABLE_ASSERT
  version = hash_table->version;
#endif

  match = FALSE;

  for (i = 0; i < hash_table->size; i++)
    {
      guint node_hash = hash_table->hashes[i];
      gpointer node_key = hash_table->keys[i];
      gpointer node_value = hash_table->values[i];

      if (HASH_IS_REAL (node_hash))
        match = predicate (node_key, node_value, user_data);

#ifndef G_DISABLE_ASSERT
      g_return_val_if_fail (version == hash_table->version, NULL);
#endif

      if (match)
        return node_value;
    }

  return NULL;
}

/**
 * g_hash_table_size:
 * @hash_table: a #GHashTable
 *
 * Returns the number of elements contained in the #GHashTable.
 *
 * Returns: the number of key/value pairs in the #GHashTable.
 */
guint
g_hash_table_size (GHashTable *hash_table)
{
  g_return_val_if_fail (hash_table != NULL, 0);

  return hash_table->nnodes;
}

/**
 * g_hash_table_get_keys:
 * @hash_table: a #GHashTable
 *
 * Retrieves every key inside @hash_table. The returned data is valid
 * until changes to the hash release those keys.
 *
 * This iterates over every entry in the hash table to build its return value.
 * To iterate over the entries in a #GHashTable more efficiently, use a
 * #GHashTableIter.
 *
 * Returns: (transfer container): a #GList containing all the keys
 *     inside the hash table. The content of the list is owned by the
 *     hash table and should not be modified or freed. Use g_list_free()
 *     when done using the list.
 *
 * Since: 2.14
 */
GList *
g_hash_table_get_keys (GHashTable *hash_table)
{
  gint i;
  GList *retval;

  g_return_val_if_fail (hash_table != NULL, NULL);

  retval = NULL;
  for (i = 0; i < hash_table->size; i++)
    {
      if (HASH_IS_REAL (hash_table->hashes[i]))
        retval = g_list_prepend (retval, hash_table->keys[i]);
    }

  return retval;
}

/**
 * g_hash_table_get_keys_as_array:
 * @hash_table: a #GHashTable
 * @length: (out): the length of the returned array
 *
 * Retrieves every key inside @hash_table, as an array.
 *
 * The returned array is %NULL-terminated but may contain %NULL as a
 * key.  Use @length to determine the true length if it's possible that
 * %NULL was used as the value for a key.
 *
 * Note: in the common case of a string-keyed #GHashTable, the return
 * value of this function can be conveniently cast to (const gchar **).
 *
 * This iterates over every entry in the hash table to build its return value.
 * To iterate over the entries in a #GHashTable more efficiently, use a
 * #GHashTableIter.
 *
 * You should always free the return result with g_free().  In the
 * above-mentioned case of a string-keyed hash table, it may be
 * appropriate to use g_strfreev() if you call g_hash_table_steal_all()
 * first to transfer ownership of the keys.
 *
 * Returns: (array length=length) (transfer container): a
 *   %NULL-terminated array containing each key from the table.
 *
 * Since: 2.40
 **/
gpointer *
g_hash_table_get_keys_as_array (GHashTable *hash_table,
                                guint      *length)
{
  gpointer *result;
  guint i, j = 0;

  result = g_new (gpointer, hash_table->nnodes + 1);
  for (i = 0; i < hash_table->size; i++)
    {
      if (HASH_IS_REAL (hash_table->hashes[i]))
        result[j++] = hash_table->keys[i];
    }
  g_assert_cmpint (j, ==, hash_table->nnodes);
  result[j] = NULL;

  if (length)
    *length = j;

  return result;
}

/**
 * g_hash_table_get_values:
 * @hash_table: a #GHashTable
 *
 * Retrieves every value inside @hash_table. The returned data
 * is valid until @hash_table is modified.
 *
 * This iterates over every entry in the hash table to build its return value.
 * To iterate over the entries in a #GHashTable more efficiently, use a
 * #GHashTableIter.
 *
 * Returns: (transfer container): a #GList containing all the values
 *     inside the hash table. The content of the list is owned by the
 *     hash table and should not be modified or freed. Use g_list_free()
 *     when done using the list.
 *
 * Since: 2.14
 */
GList *
g_hash_table_get_values (GHashTable *hash_table)
{
  gint i;
  GList *retval;

  g_return_val_if_fail (hash_table != NULL, NULL);

  retval = NULL;
  for (i = 0; i < hash_table->size; i++)
    {
      if (HASH_IS_REAL (hash_table->hashes[i]))
        retval = g_list_prepend (retval, hash_table->values[i]);
    }

  return retval;
}

/* Hash functions.
 */

/**
 * g_str_equal:
 * @v1: (not nullable): a key
 * @v2: (not nullable): a key to compare with @v1
 *
 * Compares two strings for byte-by-byte equality and returns %TRUE
 * if they are equal. It can be passed to g_hash_table_new() as the
 * @key_equal_func parameter, when using non-%NULL strings as keys in a
 * #GHashTable.
 *
 * This function is typically used for hash table comparisons, but can be used
 * for general purpose comparisons of non-%NULL strings. For a %NULL-safe string
 * comparison function, see g_strcmp0().
 *
 * Returns: %TRUE if the two keys match
 */
gboolean
g_str_equal (gconstpointer v1,
             gconstpointer v2)
{
  const gchar *string1 = v1;
  const gchar *string2 = v2;

  return strcmp (string1, string2) == 0;
}

/**
 * g_str_hash:
 * @v: (not nullable): a string key
 *
 * Converts a string to a hash value.
 *
 * This function implements the widely used "djb" hash apparently
 * posted by Daniel Bernstein to comp.lang.c some time ago.  The 32
 * bit unsigned hash value starts at 5381 and for each byte 'c' in
 * the string, is updated: `hash = hash * 33 + c`. This function
 * uses the signed value of each byte.
 *
 * It can be passed to g_hash_table_new() as the @hash_func parameter,
 * when using non-%NULL strings as keys in a #GHashTable.
 *
 * Note that this function may not be a perfect fit for all use cases.
 * For example, it produces some hash collisions with strings as short
 * as 2.
 *
 * Returns: a hash value corresponding to the key
 */
guint
g_str_hash (gconstpointer v)
{
  const signed char *p;
  guint32 h = 5381;

  for (p = v; *p != '\0'; p++)
    h = (h << 5) + h + *p;

  return h;
}

/**
 * g_direct_hash:
 * @v: (nullable): a #gpointer key
 *
 * Converts a gpointer to a hash value.
 * It can be passed to g_hash_table_new() as the @hash_func parameter,
 * when using opaque pointers compared by pointer value as keys in a
 * #GHashTable.
 *
 * This hash function is also appropriate for keys that are integers
 * stored in pointers, such as `GINT_TO_POINTER (n)`.
 *
 * Returns: a hash value corresponding to the key.
 */
guint
g_direct_hash (gconstpointer v)
{
  return GPOINTER_TO_UINT (v);
}

/**
 * g_direct_equal:
 * @v1: (nullable): a key
 * @v2: (nullable): a key to compare with @v1
 *
 * Compares two #gpointer arguments and returns %TRUE if they are equal.
 * It can be passed to g_hash_table_new() as the @key_equal_func
 * parameter, when using opaque pointers compared by pointer value as
 * keys in a #GHashTable.
 *
 * This equality function is also appropriate for keys that are integers
 * stored in pointers, such as `GINT_TO_POINTER (n)`.
 *
 * Returns: %TRUE if the two keys match.
 */
gboolean
g_direct_equal (gconstpointer v1,
                gconstpointer v2)
{
  return v1 == v2;
}

/**
 * g_int_equal:
 * @v1: (not nullable): a pointer to a #gint key
 * @v2: (not nullable): a pointer to a #gint key to compare with @v1
 *
 * Compares the two #gint values being pointed to and returns
 * %TRUE if they are equal.
 * It can be passed to g_hash_table_new() as the @key_equal_func
 * parameter, when using non-%NULL pointers to integers as keys in a
 * #GHashTable.
 *
 * Note that this function acts on pointers to #gint, not on #gint
 * directly: if your hash table's keys are of the form
 * `GINT_TO_POINTER (n)`, use g_direct_equal() instead.
 *
 * Returns: %TRUE if the two keys match.
 */
gboolean
g_int_equal (gconstpointer v1,
             gconstpointer v2)
{
  return *((const gint*) v1) == *((const gint*) v2);
}

/**
 * g_int_hash:
 * @v: (not nullable): a pointer to a #gint key
 *
 * Converts a pointer to a #gint to a hash value.
 * It can be passed to g_hash_table_new() as the @hash_func parameter,
 * when using non-%NULL pointers to integer values as keys in a #GHashTable.
 *
 * Note that this function acts on pointers to #gint, not on #gint
 * directly: if your hash table's keys are of the form
 * `GINT_TO_POINTER (n)`, use g_direct_hash() instead.
 *
 * Returns: a hash value corresponding to the key.
 */
guint
g_int_hash (gconstpointer v)
{
  return *(const gint*) v;
}

/**
 * g_int64_equal:
 * @v1: (not nullable): a pointer to a #gint64 key
 * @v2: (not nullable): a pointer to a #gint64 key to compare with @v1
 *
 * Compares the two #gint64 values being pointed to and returns
 * %TRUE if they are equal.
 * It can be passed to g_hash_table_new() as the @key_equal_func
 * parameter, when using non-%NULL pointers to 64-bit integers as keys in a
 * #GHashTable.
 *
 * Returns: %TRUE if the two keys match.
 *
 * Since: 2.22
 */
gboolean
g_int64_equal (gconstpointer v1,
               gconstpointer v2)
{
  return *((const gint64*) v1) == *((const gint64*) v2);
}

/**
 * g_int64_hash:
 * @v: (not nullable): a pointer to a #gint64 key
 *
 * Converts a pointer to a #gint64 to a hash value.
 *
 * It can be passed to g_hash_table_new() as the @hash_func parameter,
 * when using non-%NULL pointers to 64-bit integer values as keys in a
 * #GHashTable.
 *
 * Returns: a hash value corresponding to the key.
 *
 * Since: 2.22
 */
guint
g_int64_hash (gconstpointer v)
{
  return (guint) *(const gint64*) v;
}

/**
 * g_double_equal:
 * @v1: (not nullable): a pointer to a #gdouble key
 * @v2: (not nullable): a pointer to a #gdouble key to compare with @v1
 *
 * Compares the two #gdouble values being pointed to and returns
 * %TRUE if they are equal.
 * It can be passed to g_hash_table_new() as the @key_equal_func
 * parameter, when using non-%NULL pointers to doubles as keys in a
 * #GHashTable.
 *
 * Returns: %TRUE if the two keys match.
 *
 * Since: 2.22
 */
gboolean
g_double_equal (gconstpointer v1,
                gconstpointer v2)
{
  return *((const gdouble*) v1) == *((const gdouble*) v2);
}

/**
 * g_double_hash:
 * @v: (not nullable): a pointer to a #gdouble key
 *
 * Converts a pointer to a #gdouble to a hash value.
 * It can be passed to g_hash_table_new() as the @hash_func parameter,
 * It can be passed to g_hash_table_new() as the @hash_func parameter,
 * when using non-%NULL pointers to doubles as keys in a #GHashTable.
 *
 * Returns: a hash value corresponding to the key.
 *
 * Since: 2.22
 */
guint
g_double_hash (gconstpointer v)
{
  return (guint) *(const gdouble*) v;
}