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Comparing deliantra/server/common/shstr.C (file contents):
Revision 1.14 by root, Mon Sep 11 23:33:28 2006 UTC vs.
Revision 1.54 by root, Sun Nov 25 02:17:31 2018 UTC

1/*
2 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
3 *
4 * Copyright (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team
5 * Copyright (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
6 *
7 * Deliantra is free software: you can redistribute it and/or modify it under
8 * the terms of the Affero GNU General Public License as published by the
9 * Free Software Foundation, either version 3 of the License, or (at your
10 * option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the Affero GNU General Public License
18 * and the GNU General Public License along with this program. If not, see
19 * <http://www.gnu.org/licenses/>.
20 *
21 * The authors can be reached via e-mail to <support@deliantra.net>
22 */
1 23
2/* 24/*
3 * shstr.C 25 * shstr.C
4 */ 26 */
5 27
6#include <cstring> 28#include <cstring>
7#include <cstdlib> 29#include <cstdlib>
8
9#include <glib.h> 30#include <glib.h>
10 31
11#include <tr1/unordered_set> 32#include <flat_hash_map.hpp>
12 33
13#include "shstr.h" 34#include <global.h>
14#include "util.h"
15 35
16typedef 36size_t shstr_alloc;
17std::tr1::unordered_set < const char *,
18 str_hash,
19 str_equal >
20 HT;
21 37
38typedef ska::flat_hash_set<const char *, str_hash, str_equal, slice_allocator<const char *>> HT;
39
22static HT 40static HT ht;
23 ht; 41static int next_gc;
42
43#define NUM_INT 3
24 44
25static const char * 45static const char *
26makevec (const char *s) 46makevec (const char *s)
27{ 47{
28 int
29 len = strlen (s); 48 int len = strlen (s);
49 int alloc = sizeof (uint32_t) * NUM_INT + len + 1;
30 50
31 const char * 51 shstr_alloc += alloc;
32 v = (const char *) (2 + (int *) g_slice_alloc (sizeof (int) * 2 + len + 1)); 52 char *v = (char *)g_slice_alloc (alloc);
53 v += sizeof (uint32_t) * NUM_INT;
33 54
55 shstr::hash (v) = strhsh (s);
34 shstr::length (v) = len; 56 shstr::length (v) = len;
35 shstr::refcnt (v) = 1; 57 shstr::refcnt (v) = 1;
36 58
37 memcpy ((char *) v, s, len + 1); 59 memcpy (v, s, len + 1);
38 60
39 return v; 61 return v;
40} 62}
41 63
42const char * 64shstr_vec<sizeof "(null)"> shstr_tmp::nullvec = { STRHSH_NULL, 0, 0xffffffff, "(null)" };
43 shstr::null = makevec ("<nil>");
44 65
45// what weird misoptimisation is this again? 66bool
46const shstr undead_name ("undead"); 67shstr_tmp::contains (const char *substring) const
68{
69 //TODO: this is supposed to check for comma-seperation...
70 return s != null ()
71 && substring
72 && strstr (s, substring);
73}
47 74
48const char * 75const char *
49shstr::find (const char *s) 76shstr::find (const char *s)
50{ 77{
51 if (!s) 78 if (!s)
52 return s; 79 return s;
53 80
54 HT::iterator i = ht.find (s); 81 auto (i, ht.find (s));
55 82
56 return i != ht.end ()? *i : 0; 83 return i != ht.end ()? *i : 0;
57} 84}
58 85
59const char * 86const char *
60shstr::intern (const char *s) 87shstr::intern (const char *s)
61{ 88{
62 if (!s) 89 if (!s)
63 return null; 90 return null ();
64 91
65 if (const char *found = find (s)) 92 if (const char *found = find (s))
66 { 93 {
67 ++refcnt (found); 94 ++refcnt (found);
68 return found; 95 return found;
69 } 96 }
70 97
98 --next_gc;
71 s = makevec (s); 99 s = makevec (s);
72 ht.insert (s); 100 ht.insert (s);
73 return s; 101 return s;
74} 102}
75 103
76// periodically test refcounts == 0 for a few strings 104// periodically test refcounts == 0 for a few strings
77// this is the ONLY thing that erases stuff from ht. keep it that way. 105// this is the ONLY thing that erases stuff from ht. keep it that way.
78void 106void
79shstr::gc () 107shstr::gc ()
80{ 108{
81return; //D 109 if (expect_true (next_gc > 0))
82//D currently disabled: some datastructures might still store them 110 return;
83//D but their pointers will become invalidated 111
84 static const char *curpos; 112 static const char *curpos;
85 113
86 HT::iterator i = curpos ? ht.find (curpos) : ht.begin (); 114 auto i = curpos ? ht.find (curpos) : ht.begin ();
87 115
88 if (i == ht.end ()) 116 if (i == ht.end ())
89 i = ht.begin (); 117 i = ht.begin ();
90 118
91 // go through all strings roughly once every 4 minutes
92 int n = ht.size () / 256 + 16; 119 int n = ht.size () / 256 + 16;
120 next_gc += n >> 1;
93 121
94 for (;;) 122 for (;;)
95 { 123 {
96 if (i == ht.end ()) 124 if (i == ht.end ())
97 { 125 {
… …
100 } 128 }
101 else if (!--n) 129 else if (!--n)
102 break; 130 break;
103 else if (!refcnt (*i)) 131 else if (!refcnt (*i))
104 { 132 {
105 HT::iterator o = i++;
106 const char *s = *o; 133 const char *s = *i;
107 134
108 ht.erase (o); 135 i = ht.erase (i);
109 136
110 //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); 137 //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s));
111 g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *) s); 138 int alloc = sizeof (uint32_t) * NUM_INT + length (s) + 1;
139 shstr_alloc -= alloc;
140 g_slice_free1 (alloc, (void *)(s - sizeof (uint32_t) * NUM_INT));
112 } 141 }
113 else 142 else
114 ++i; 143 ++i;
115 } 144 }
116 145
117 curpos = *i; 146 curpos = *i;
118} 147}
119 148
120//TODO: this should of course not be here 149// declare these here to get correct initialisation order
150#define def2(id,str) const shstr id (str);
151#define def(id) def2(shstr_ ## id, # id)
152# include "shstrinc.h"
153#undef def
154#undef def2
121 155
122/* buf_overflow() - we don't want to exceed the buffer size of 156materialtype_t material_null;
123 * buf1 by adding on buf2! Returns true if overflow will occur.
124 */
125 157
126int 158struct freed_map freed_map;
127buf_overflow (const char *buf1, const char *buf2, int bufsize)
128{
129 int len1 = 0, len2 = 0;
130
131 if (buf1)
132 len1 = strlen (buf1);
133 if (buf2)
134 len2 = strlen (buf2);
135 if ((len1 + len2) >= bufsize)
136 return 1;
137 return 0;
138}

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