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  }