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Comparing deliantra/server/common/shstr.C (file contents):
Revision 1.17 by root, Tue Sep 12 19:20:06 2006 UTC vs.
Revision 1.40 by root, Wed Nov 4 00:02:48 2009 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 it under
7 * the terms of the Affero GNU General Public License as published by the
8 * Free Software Foundation, either version 3 of the License, or (at your
9 * 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 Affero GNU General Public License
17 * and the GNU General Public License along with this program. If not, see
18 * <http://www.gnu.org/licenses/>.
19 *
20 * The authors can be reached via e-mail to <support@deliantra.net>
21 */
1 22
2/* 23/*
3 * shstr.C 24 * shstr.C
4 */ 25 */
5 26
6#include <cstring> 27#include <cstring>
7#include <cstdlib> 28#include <cstdlib>
8
9#include <glib.h> 29#include <glib.h>
10
11#include <tr1/unordered_set> 30#include <tr1/unordered_set>
12 31
13#include "global.h" 32#include "global.h"
14 33
34size_t shstr_alloc;
35
15typedef std::tr1::unordered_set<const char *, str_hash, str_equal> HT; 36typedef std::tr1::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *> > HT;
16 37
17static HT ht; 38static HT ht;
39static int next_gc;
18 40
19static const char * 41static const char *
20makevec (const char *s) 42makevec (const char *s)
21{ 43{
22 int len = strlen (s); 44 int len = strlen (s);
45 int alloc = sizeof (uint32_t) * 2 + len + 1;
23 46
24 const char *v = (const char *) (2 + (int *) g_slice_alloc (sizeof (int) * 2 + len + 1)); 47 shstr_alloc += alloc;
48 char *v = (char *)g_slice_alloc (alloc);
49 v += sizeof (uint32_t) * 2;
25 50
26 shstr::length (v) = len; 51 shstr::length (v) = len;
27 shstr::refcnt (v) = 1; 52 shstr::refcnt (v) = 1;
28 53
29 memcpy ((char *) v, s, len + 1); 54 memcpy (v, s, len + 1);
30 55
31 return v; 56 return v;
32} 57}
33 58
34static const char * 59shstr_vec<sizeof "(null)"> shstr_tmp::nullvec = { 0, 0xffffffff, "(null)" };
35makenull ()
36{
37 const char *s = makevec ("(null)");
38 shstr::length (s) = 0;
39 return s;
40}
41
42const char *shstr::null = makenull ();
43 60
44const char * 61const char *
45shstr::find (const char *s) 62shstr::find (const char *s)
46{ 63{
47 if (!s) 64 if (!s)
48 return s; 65 return s;
49 66
50 HT::iterator i = ht.find (s); 67 auto (i, ht.find (s));
51 68
52 return i != ht.end ()? *i : 0; 69 return i != ht.end ()? *i : 0;
53} 70}
54 71
55const char * 72const char *
56shstr::intern (const char *s) 73shstr::intern (const char *s)
57{ 74{
58 if (!s) 75 if (!s)
59 return null; 76 return null ();
60 77
61 if (const char *found = find (s)) 78 if (const char *found = find (s))
62 { 79 {
63 ++refcnt (found); 80 ++refcnt (found);
64 return found; 81 return found;
65 } 82 }
66 83
84 --next_gc;
67 s = makevec (s); 85 s = makevec (s);
68 ht.insert (s); 86 ht.insert (s);
69 return s; 87 return s;
70} 88}
71 89
72// periodically test refcounts == 0 for a few strings 90// periodically test refcounts == 0 for a few strings
73// this is the ONLY thing that erases stuff from ht. keep it that way. 91// this is the ONLY thing that erases stuff from ht. keep it that way.
74void 92void
75shstr::gc () 93shstr::gc ()
76{ 94{
77return; //D 95 if (expect_true (next_gc > 0))
78//D currently disabled: some datastructures might still store them 96 return;
79//D but their pointers will become invalidated 97
80 static const char *curpos; 98 static const char *curpos;
81 99
82 HT::iterator i = curpos ? ht.find (curpos) : ht.begin (); 100 auto (i, curpos ? ht.find (curpos) : ht.begin ());
83 101
84 if (i == ht.end ()) 102 if (i == ht.end ())
85 i = ht.begin (); 103 i = ht.begin ();
86 104
87 // go through all strings roughly once every 4 minutes
88 int n = ht.size () / 256 + 16; 105 int n = ht.size () / 256 + 16;
106 next_gc += n >> 1;
89 107
90 for (;;) 108 for (;;)
91 { 109 {
92 if (i == ht.end ()) 110 if (i == ht.end ())
93 { 111 {
… …
96 } 114 }
97 else if (!--n) 115 else if (!--n)
98 break; 116 break;
99 else if (!refcnt (*i)) 117 else if (!refcnt (*i))
100 { 118 {
101 HT::iterator o = i++; 119 auto (o, i++);
102 const char *s = *o; 120 const char *s = *o;
103 121
104 ht.erase (o); 122 ht.erase (o);
105 123
106 //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); 124 //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s));
107 g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *) s); 125 int alloc = sizeof (uint32_t) * 2 + length (s) + 1;
126 shstr_alloc -= alloc;
127 g_slice_free1 (alloc, (void *)(s - sizeof (uint32_t) * 2));
108 } 128 }
109 else 129 else
110 ++i; 130 ++i;
111 } 131 }
112 132
113 curpos = *i; 133 curpos = *i;
114} 134}
115 135
136// declare these here to get correct initialisation order
137#define def2(id,str) const shstr id (str);
138#define def(id) def2(shstr_ ## id, # id)
139# include "shstrinc.h"
140#undef def
141#undef def2
142
116shstr skill_names[NUM_SKILLS]; 143shstr skill_names[NUM_SKILLS];
117 144
118// what weird misoptimisation is this again?
119const shstr undead_name ("undead");
120
121//TODO: this should of course not be here
122
123/* buf_overflow() - we don't want to exceed the buffer size of
124 * buf1 by adding on buf2! Returns true if overflow will occur.
125 */
126
127int
128buf_overflow (const char *buf1, const char *buf2, int bufsize)
129{
130 int len1 = 0, len2 = 0;
131
132 if (buf1)
133 len1 = strlen (buf1);
134 if (buf2)
135 len2 = strlen (buf2);
136 if ((len1 + len2) >= bufsize)
137 return 1;
138 return 0;
139}

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