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Comparing deliantra/server/common/shstr.C (file contents):
Revision 1.7 by root, Sun Sep 3 23:33:00 2006 UTC vs.
Revision 1.30 by root, Sat May 3 11:14:50 2008 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
5 *
6 * Deliantra is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 *
19 * The authors can be reached via e-mail to <support@deliantra.net>
20 */
21
1/* 22/*
2 * shstr.C 23 * shstr.C
3 */ 24 */
4 25
5#include <cstring> 26#include <cstring>
6#include <cstdlib> 27#include <cstdlib>
7 28#include <glib.h>
8#include <tr1/unordered_set> 29#include <tr1/unordered_set>
9 30
10#include "shstr.h" 31#include "global.h"
11 32
12struct hash 33size_t shstr_alloc;
13{
14 std::size_t operator ()(const char *s) const
15 {
16 unsigned long hash = 0;
17 unsigned int i = 0;
18 34
19 /* use the one-at-a-time hash function, which supposedly is 35typedef std::tr1::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *>, true> HT;
20 * better than the djb2-like one used by perl5.005, but
21 * certainly is better then the bug used here before.
22 * see http://burtleburtle.net/bob/hash/doobs.html
23 */
24 while (*s)
25 {
26 hash += *s++;
27 hash += hash << 10;
28 hash ^= hash >> 6;
29 }
30
31 hash += hash << 3;
32 hash ^= hash >> 11;
33 hash += hash << 15;
34
35 return hash;
36 }
37};
38
39struct equal
40{
41 bool operator ()(const char *a, const char *b) const
42 {
43 return !strcmp (a, b);
44 }
45};
46
47typedef std::tr1::unordered_set<const char *, hash, equal> HT;
48 36
49static HT ht; 37static HT ht;
38static int next_gc;
50 39
51static const char *makevec (const char *s) 40static const char *
41makevec (const char *s)
52{ 42{
53 int len = strlen (s); 43 int len = strlen (s);
54 44
45 shstr_alloc += sizeof (int) * 2 + len + 1;
55 const char *v = (const char *)(2 + (int *)malloc (sizeof (int) * 2 + len + 1)); 46 const char *v = (const char *) (2 + (int *)g_slice_alloc (sizeof (int) * 2 + len + 1));
56 47
57 shstr::length (v) = len; 48 shstr::length (v) = len;
58 shstr::refcnt (v) = 1; 49 shstr::refcnt (v) = 1;
59 50
60 memcpy ((char *)v, s, len + 1); 51 memcpy ((char *) v, s, len + 1);
61 52
53 return v;
54}
55
56static const char *
57makenull ()
58{
59 const char *s = makevec ("(null)");
60 shstr::length (s) = 0;
62 return s; 61 return s;
63} 62}
64 63
65const char *shstr::null = makevec ("<nil>"); 64const char *shstr::null = makenull ();
66 65
67const char * 66const char *
68shstr::find (const char *s) 67shstr::find (const char *s)
69{ 68{
70 if (!s) 69 if (!s)
71 return s; 70 return s;
72 71
73 HT::iterator i = ht.find (s); 72 auto (i, ht.find (s));
74 73
75 return i != ht.end () 74 return i != ht.end ()? *i : 0;
76 ? *i
77 : 0;
78} 75}
79 76
80const char * 77const char *
81shstr::intern (const char *s) 78shstr::intern (const char *s)
82{ 79{
… …
87 { 84 {
88 ++refcnt (found); 85 ++refcnt (found);
89 return found; 86 return found;
90 } 87 }
91 88
89 --next_gc;
92 s = makevec (s); 90 s = makevec (s);
93 ht.insert (s); 91 ht.insert (s);
94 return s; 92 return s;
95} 93}
96 94
97// periodically test refcounts == 0 for a few strings 95// periodically test refcounts == 0 for a few strings
98// this is the ONLY thing that erases stuff from ht. keep it that way. 96// this is the ONLY thing that erases stuff from ht. keep it that way.
99void 97void
100shstr::gc () 98shstr::gc ()
101{ 99{
100 if (expect_true (next_gc > 0))
101 return;
102
102 static const char *curpos; 103 static const char *curpos;
103 104
104 HT::iterator i = curpos ? ht.find (curpos) : ht.begin (); 105 auto (i, curpos ? ht.find (curpos) : ht.begin ());
105 106
106 if (i == ht.end ()) 107 if (i == ht.end ())
107 i = ht.begin (); 108 i = ht.begin ();
108 109
109 // go through all strings roughly once every 4 minutes
110 int n = ht.size () / 256 + 16; 110 int n = ht.size () / 256 + 16;
111 next_gc += n >> 1;
111 112
112 for (;;) 113 for (;;)
113 { 114 {
114 if (i == ht.end ()) 115 if (i == ht.end ())
115 { 116 {
… …
118 } 119 }
119 else if (!--n) 120 else if (!--n)
120 break; 121 break;
121 else if (!refcnt (*i)) 122 else if (!refcnt (*i))
122 { 123 {
123 HT::iterator o = i++; 124 auto (o, i++);
124 const char *s = *o; 125 const char *s = *o;
126
125 ht.erase (o); 127 ht.erase (o);
126 128
127 //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); 129 //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s));
128 free (-2 + (int *)s); 130 shstr_alloc -= sizeof (int) * 2 + length (s) + 1;
131 g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *) s);
129 } 132 }
130 else 133 else
131 ++i; 134 ++i;
132 } 135 }
133 136
134 curpos = *i; 137 curpos = *i;
135} 138}
136 139
140const shstr shstr_null;
141
142// declare these here to get correct initialisation order
143#define def(str) const shstr shstr_ ## str (# str);
144# include "shstrinc.h"
145#undef def
146
147shstr skill_names[NUM_SKILLS];
148
137//TODO: this should of course not be here 149//TODO: this should of course not be here
150
138/* buf_overflow() - we don't want to exceed the buffer size of 151/* buf_overflow() - we don't want to exceed the buffer size of
139 * buf1 by adding on buf2! Returns true if overflow will occur. 152 * buf1 by adding on buf2! Returns true if overflow will occur.
140 */ 153 */
141
142int 154int
143buf_overflow (const char *buf1, const char *buf2, int bufsize) 155buf_overflow (const char *buf1, const char *buf2, int bufsize)
144{ 156{
145 int len1 = 0, len2 = 0; 157 int len1 = 0, len2 = 0;
146 158
147 if (buf1) 159 if (buf1)
148 len1 = strlen (buf1); 160 len1 = strlen (buf1);
161
149 if (buf2) 162 if (buf2)
150 len2 = strlen (buf2); 163 len2 = strlen (buf2);
164
151 if ((len1 + len2) >= bufsize) 165 if ((len1 + len2) >= bufsize)
152 return 1;
153 return 0; 166 return 1;
167
168 return 0;
154} 169}
155

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