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Comparing deliantra/server/common/shstr.C (file contents):
Revision 1.15 by root, Tue Sep 12 00:26:16 2006 UTC vs.
Revision 1.33 by root, Wed Dec 31 18:07:41 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 */
1 21
2/* 22/*
3 * shstr.C 23 * shstr.C
4 */ 24 */
5 25
6#include <cstring> 26#include <cstring>
7#include <cstdlib> 27#include <cstdlib>
8
9#include <glib.h> 28#include <glib.h>
10
11#include <tr1/unordered_set> 29#include <tr1/unordered_set>
12 30
13#include "shstr.h"
14#include "util.h" 31#include "global.h"
15 32
16typedef 33size_t shstr_alloc;
17std::tr1::unordered_set < const char *,
18 str_hash,
19 str_equal >
20 HT;
21 34
35typedef std::tr1::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *> > HT;
36
22static HT 37static HT ht;
23 ht; 38static int next_gc;
24 39
25static const char * 40static const char *
26makevec (const char *s) 41makevec (const char *s)
27{ 42{
28 int
29 len = strlen (s); 43 int len = strlen (s);
30 44
31 const char * 45 shstr_alloc += sizeof (uint32_t) * 2 + len + 1;
32 v = (const char *) (2 + (int *) g_slice_alloc (sizeof (int) * 2 + len + 1)); 46 const char *v = (const char *) (2 + (int *)g_slice_alloc (sizeof (uint32_t) * 2 + len + 1));
33 47
34 shstr::length (v) = len; 48 shstr::length (v) = len;
35 shstr::refcnt (v) = 1; 49 shstr::refcnt (v) = 1;
36 50
37 memcpy ((char *) v, s, len + 1); 51 memcpy ((char *) v, s, len + 1);
38 52
39 return v; 53 return v;
40} 54}
41 55
42const char * 56shstr_vec<sizeof "(null)"> shstr_tmp::nullvec = { 0, 0xffffffff, "(null)" };
43 shstr::null = makevec ("<nil>");
44
45// what weird misoptimisation is this again?
46const shstr undead_name ("undead");
47
48shstr skill_names[NUM_SKILLS];
49 57
50const char * 58const char *
51shstr::find (const char *s) 59shstr::find (const char *s)
52{ 60{
53 if (!s) 61 if (!s)
54 return s; 62 return s;
55 63
56 HT::iterator i = ht.find (s); 64 auto (i, ht.find (s));
57 65
58 return i != ht.end ()? *i : 0; 66 return i != ht.end ()? *i : 0;
59} 67}
60 68
61const char * 69const char *
62shstr::intern (const char *s) 70shstr::intern (const char *s)
63{ 71{
64 if (!s) 72 if (!s)
65 return null; 73 return null ();
66 74
67 if (const char *found = find (s)) 75 if (const char *found = find (s))
68 { 76 {
69 ++refcnt (found); 77 ++refcnt (found);
70 return found; 78 return found;
71 } 79 }
72 80
81 --next_gc;
73 s = makevec (s); 82 s = makevec (s);
74 ht.insert (s); 83 ht.insert (s);
75 return s; 84 return s;
76} 85}
77 86
78// periodically test refcounts == 0 for a few strings 87// periodically test refcounts == 0 for a few strings
79// this is the ONLY thing that erases stuff from ht. keep it that way. 88// this is the ONLY thing that erases stuff from ht. keep it that way.
80void 89void
81shstr::gc () 90shstr::gc ()
82{ 91{
83return; //D 92 if (expect_true (next_gc > 0))
84//D currently disabled: some datastructures might still store them 93 return;
85//D but their pointers will become invalidated 94
86 static const char *curpos; 95 static const char *curpos;
87 96
88 HT::iterator i = curpos ? ht.find (curpos) : ht.begin (); 97 auto (i, curpos ? ht.find (curpos) : ht.begin ());
89 98
90 if (i == ht.end ()) 99 if (i == ht.end ())
91 i = ht.begin (); 100 i = ht.begin ();
92 101
93 // go through all strings roughly once every 4 minutes
94 int n = ht.size () / 256 + 16; 102 int n = ht.size () / 256 + 16;
103 next_gc += n >> 1;
95 104
96 for (;;) 105 for (;;)
97 { 106 {
98 if (i == ht.end ()) 107 if (i == ht.end ())
99 { 108 {
… …
102 } 111 }
103 else if (!--n) 112 else if (!--n)
104 break; 113 break;
105 else if (!refcnt (*i)) 114 else if (!refcnt (*i))
106 { 115 {
107 HT::iterator o = i++; 116 auto (o, i++);
108 const char *s = *o; 117 const char *s = *o;
109 118
110 ht.erase (o); 119 ht.erase (o);
111 120
112 //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); 121 //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s));
122 shstr_alloc -= sizeof (uint32_t) * 2 + length (s) + 1;
113 g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *) s); 123 g_slice_free1 (sizeof (uint32_t) * 2 + length (s) + 1, -2 + (int *) s);
114 } 124 }
115 else 125 else
116 ++i; 126 ++i;
117 } 127 }
118 128
119 curpos = *i; 129 curpos = *i;
120} 130}
121 131
132// declare these here to get correct initialisation order
133#define def(str) const shstr shstr_ ## str (# str);
134# include "shstrinc.h"
135#undef def
136
137shstr skill_names[NUM_SKILLS];
138
122//TODO: this should of course not be here 139//TODO: this should of course not be here
123 140
124/* buf_overflow() - we don't want to exceed the buffer size of 141/* buf_overflow() - we don't want to exceed the buffer size of
125 * buf1 by adding on buf2! Returns true if overflow will occur. 142 * buf1 by adding on buf2! Returns true if overflow will occur.
126 */ 143 */
127
128int 144int
129buf_overflow (const char *buf1, const char *buf2, int bufsize) 145buf_overflow (const char *buf1, const char *buf2, int bufsize)
130{ 146{
131 int len1 = 0, len2 = 0; 147 int len1 = 0, len2 = 0;
132 148
133 if (buf1) 149 if (buf1)
134 len1 = strlen (buf1); 150 len1 = strlen (buf1);
151
135 if (buf2) 152 if (buf2)
136 len2 = strlen (buf2); 153 len2 = strlen (buf2);
154
137 if ((len1 + len2) >= bufsize) 155 if ((len1 + len2) >= bufsize)
138 return 1; 156 return 1;
157
139 return 0; 158 return 0;
140} 159}

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