github.com/llvm-mirror/llgo@v0.0.0-20190322182713-bf6f0a60fce1/third_party/gofrontend/libgo/runtime/go-new-map.c (about) 1 /* go-new-map.c -- allocate a new map. 2 3 Copyright 2009 The Go Authors. All rights reserved. 4 Use of this source code is governed by a BSD-style 5 license that can be found in the LICENSE file. */ 6 7 #include "runtime.h" 8 #include "go-alloc.h" 9 #include "map.h" 10 11 /* List of prime numbers, copied from libstdc++/src/hashtable.c. */ 12 13 static const unsigned long prime_list[] = /* 256 + 1 or 256 + 48 + 1 */ 14 { 15 2ul, 3ul, 5ul, 7ul, 11ul, 13ul, 17ul, 19ul, 23ul, 29ul, 31ul, 16 37ul, 41ul, 43ul, 47ul, 53ul, 59ul, 61ul, 67ul, 71ul, 73ul, 79ul, 17 83ul, 89ul, 97ul, 103ul, 109ul, 113ul, 127ul, 137ul, 139ul, 149ul, 18 157ul, 167ul, 179ul, 193ul, 199ul, 211ul, 227ul, 241ul, 257ul, 19 277ul, 293ul, 313ul, 337ul, 359ul, 383ul, 409ul, 439ul, 467ul, 20 503ul, 541ul, 577ul, 619ul, 661ul, 709ul, 761ul, 823ul, 887ul, 21 953ul, 1031ul, 1109ul, 1193ul, 1289ul, 1381ul, 1493ul, 1613ul, 22 1741ul, 1879ul, 2029ul, 2179ul, 2357ul, 2549ul, 2753ul, 2971ul, 23 3209ul, 3469ul, 3739ul, 4027ul, 4349ul, 4703ul, 5087ul, 5503ul, 24 5953ul, 6427ul, 6949ul, 7517ul, 8123ul, 8783ul, 9497ul, 10273ul, 25 11113ul, 12011ul, 12983ul, 14033ul, 15173ul, 16411ul, 17749ul, 26 19183ul, 20753ul, 22447ul, 24281ul, 26267ul, 28411ul, 30727ul, 27 33223ul, 35933ul, 38873ul, 42043ul, 45481ul, 49201ul, 53201ul, 28 57557ul, 62233ul, 67307ul, 72817ul, 78779ul, 85229ul, 92203ul, 29 99733ul, 107897ul, 116731ul, 126271ul, 136607ul, 147793ul, 30 159871ul, 172933ul, 187091ul, 202409ul, 218971ul, 236897ul, 31 256279ul, 277261ul, 299951ul, 324503ul, 351061ul, 379787ul, 32 410857ul, 444487ul, 480881ul, 520241ul, 562841ul, 608903ul, 33 658753ul, 712697ul, 771049ul, 834181ul, 902483ul, 976369ul, 34 1056323ul, 1142821ul, 1236397ul, 1337629ul, 1447153ul, 1565659ul, 35 1693859ul, 1832561ul, 1982627ul, 2144977ul, 2320627ul, 2510653ul, 36 2716249ul, 2938679ul, 3179303ul, 3439651ul, 3721303ul, 4026031ul, 37 4355707ul, 4712381ul, 5098259ul, 5515729ul, 5967347ul, 6456007ul, 38 6984629ul, 7556579ul, 8175383ul, 8844859ul, 9569143ul, 10352717ul, 39 11200489ul, 12117689ul, 13109983ul, 14183539ul, 15345007ul, 40 16601593ul, 17961079ul, 19431899ul, 21023161ul, 22744717ul, 41 24607243ul, 26622317ul, 28802401ul, 31160981ul, 33712729ul, 42 36473443ul, 39460231ul, 42691603ul, 46187573ul, 49969847ul, 43 54061849ul, 58488943ul, 63278561ul, 68460391ul, 74066549ul, 44 80131819ul, 86693767ul, 93793069ul, 101473717ul, 109783337ul, 45 118773397ul, 128499677ul, 139022417ul, 150406843ul, 162723577ul, 46 176048909ul, 190465427ul, 206062531ul, 222936881ul, 241193053ul, 47 260944219ul, 282312799ul, 305431229ul, 330442829ul, 357502601ul, 48 386778277ul, 418451333ul, 452718089ul, 489790921ul, 529899637ul, 49 573292817ul, 620239453ul, 671030513ul, 725980837ul, 785430967ul, 50 849749479ul, 919334987ul, 994618837ul, 1076067617ul, 1164186217ul, 51 1259520799ul, 1362662261ul, 1474249943ul, 1594975441ul, 1725587117ul, 52 1866894511ul, 2019773507ul, 2185171673ul, 2364114217ul, 2557710269ul, 53 2767159799ul, 2993761039ul, 3238918481ul, 3504151727ul, 3791104843ul, 54 4101556399ul, 4294967291ul, 55 #if __SIZEOF_LONG__ >= 8 56 6442450933ul, 8589934583ul, 12884901857ul, 17179869143ul, 57 25769803693ul, 34359738337ul, 51539607367ul, 68719476731ul, 58 103079215087ul, 137438953447ul, 206158430123ul, 274877906899ul, 59 412316860387ul, 549755813881ul, 824633720731ul, 1099511627689ul, 60 1649267441579ul, 2199023255531ul, 3298534883309ul, 4398046511093ul, 61 6597069766607ul, 8796093022151ul, 13194139533241ul, 17592186044399ul, 62 26388279066581ul, 35184372088777ul, 52776558133177ul, 70368744177643ul, 63 105553116266399ul, 140737488355213ul, 211106232532861ul, 281474976710597ul, 64 562949953421231ul, 1125899906842597ul, 2251799813685119ul, 65 4503599627370449ul, 9007199254740881ul, 18014398509481951ul, 66 36028797018963913ul, 72057594037927931ul, 144115188075855859ul, 67 288230376151711717ul, 576460752303423433ul, 68 1152921504606846883ul, 2305843009213693951ul, 69 4611686018427387847ul, 9223372036854775783ul, 70 18446744073709551557ul 71 #endif 72 }; 73 74 /* Return the next number from PRIME_LIST >= N. */ 75 76 uintptr_t 77 __go_map_next_prime (uintptr_t n) 78 { 79 size_t low; 80 size_t high; 81 82 low = 0; 83 high = sizeof prime_list / sizeof prime_list[0]; 84 while (low < high) 85 { 86 size_t mid; 87 88 mid = (low + high) / 2; 89 90 /* Here LOW <= MID < HIGH. */ 91 92 if (prime_list[mid] < n) 93 low = mid + 1; 94 else if (prime_list[mid] > n) 95 high = mid; 96 else 97 return n; 98 } 99 if (low >= sizeof prime_list / sizeof prime_list[0]) 100 return n; 101 return prime_list[low]; 102 } 103 104 /* Allocate a new map. */ 105 106 struct __go_map * 107 __go_new_map (const struct __go_map_descriptor *descriptor, uintptr_t entries) 108 { 109 int32 ientries; 110 struct __go_map *ret; 111 112 /* The master library limits map entries to int32, so we do too. */ 113 ientries = (int32) entries; 114 if (ientries < 0 || (uintptr_t) ientries != entries) 115 runtime_panicstring ("map size out of range"); 116 117 if (entries == 0) 118 entries = 5; 119 else 120 entries = __go_map_next_prime (entries); 121 ret = (struct __go_map *) __go_alloc (sizeof (struct __go_map)); 122 ret->__descriptor = descriptor; 123 ret->__element_count = 0; 124 ret->__bucket_count = entries; 125 ret->__buckets = (void **) __go_alloc (entries * sizeof (void *)); 126 __builtin_memset (ret->__buckets, 0, entries * sizeof (void *)); 127 return ret; 128 } 129 130 /* Allocate a new map when the argument to make is a large type. */ 131 132 struct __go_map * 133 __go_new_map_big (const struct __go_map_descriptor *descriptor, 134 uint64_t entries) 135 { 136 uintptr_t sentries; 137 138 sentries = (uintptr_t) entries; 139 if ((uint64_t) sentries != entries) 140 runtime_panicstring ("map size out of range"); 141 return __go_new_map (descriptor, sentries); 142 }