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1 | /* |
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2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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5 | * |
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6 | * Deliantra is free software: you can redistribute it and/or modify |
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7 | * it under the terms of the GNU General Public License as published by |
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8 | * the Free Software Foundation, either version 3 of the License, or |
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9 | * (at your option) any later version. |
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10 | * |
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11 | * This program is distributed in the hope that it will be useful, |
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | * GNU General Public License for more details. |
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15 | * |
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16 | * You should have received a copy of the GNU General Public License |
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17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 | * |
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19 | * The authors can be reached via e-mail to <support@deliantra.net> |
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20 | */ |
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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 | |
12 | // NOTE: even with lots of stuff loaded, we do not usually have >>20000 strings. |
33 | size_t shstr_alloc; |
13 | // maybe refcounting is just overhead? |
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14 | |
34 | |
15 | struct hash |
35 | typedef std::tr1::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *>, true> HT; |
16 | { |
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17 | std::size_t operator ()(const char *s) const |
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18 | { |
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19 | unsigned long hash = 0; |
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20 | unsigned int i = 0; |
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21 | |
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22 | /* use the one-at-a-time hash function, which supposedly is |
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23 | * better than the djb2-like one used by perl5.005, but |
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24 | * certainly is better then the bug used here before. |
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25 | * see http://burtleburtle.net/bob/hash/doobs.html |
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26 | */ |
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27 | while (*s) |
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28 | { |
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29 | hash += *s++; |
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30 | hash += hash << 10; |
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31 | hash ^= hash >> 6; |
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32 | } |
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33 | |
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34 | hash += hash << 3; |
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35 | hash ^= hash >> 11; |
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36 | hash += hash << 15; |
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37 | |
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38 | return hash; |
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39 | } |
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40 | }; |
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41 | |
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42 | struct equal |
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43 | { |
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44 | bool operator ()(const char *a, const char *b) const |
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45 | { |
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46 | return !strcmp (a, b); |
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47 | } |
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48 | }; |
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49 | |
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50 | typedef std::tr1::unordered_set<const char *, hash, equal> HT; |
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51 | |
36 | |
52 | static HT ht; |
37 | static HT ht; |
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38 | static int next_gc; |
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39 | |
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40 | static const char * |
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41 | makevec (const char *s) |
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42 | { |
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43 | int len = strlen (s); |
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44 | |
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45 | shstr_alloc += sizeof (int) * 2 + len + 1; |
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46 | const char *v = (const char *) (2 + (int *)g_slice_alloc (sizeof (int) * 2 + len + 1)); |
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47 | |
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48 | shstr::length (v) = len; |
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49 | shstr::refcnt (v) = 1; |
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50 | |
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51 | memcpy ((char *) v, s, len + 1); |
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52 | |
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53 | return v; |
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54 | } |
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55 | |
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56 | static const char * |
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57 | makenull () |
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58 | { |
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59 | const char *s = makevec ("(null)"); |
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60 | shstr::length (s) = 0; |
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61 | return s; |
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62 | } |
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63 | |
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64 | const char *shstr::null = makenull (); |
53 | |
65 | |
54 | const char * |
66 | const char * |
55 | shstr::find (const char *s) |
67 | shstr::find (const char *s) |
56 | { |
68 | { |
57 | if (!s) |
69 | if (!s) |
58 | return s; |
70 | return s; |
59 | |
71 | |
60 | HT::iterator i = ht.find (s); |
72 | auto (i, ht.find (s)); |
61 | |
73 | |
62 | return i != ht.end () |
74 | return i != ht.end ()? *i : 0; |
63 | ? *i |
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64 | : 0; |
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65 | } |
75 | } |
66 | |
76 | |
67 | const char * |
77 | const char * |
68 | shstr::intern (const char *s) |
78 | shstr::intern (const char *s) |
69 | { |
79 | { |
70 | if (!s) |
80 | if (!s) |
71 | return s; |
81 | return null; |
72 | |
82 | |
73 | if (const char *found = find (s)) |
83 | if (const char *found = find (s)) |
74 | { |
84 | { |
75 | ++refcnt (found); |
85 | ++refcnt (found); |
76 | return found; |
86 | return found; |
77 | } |
87 | } |
78 | |
88 | |
79 | int len = strlen (s); |
89 | --next_gc; |
80 | |
90 | s = makevec (s); |
81 | const char *v = (const char *)(2 + (int *)malloc (sizeof (int) * 2 + len + 1)); |
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82 | |
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83 | length (v) = len; |
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84 | refcnt (v) = 1; |
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85 | |
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86 | memcpy ((char *)v, s, len + 1); |
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87 | |
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88 | ht.insert (v); |
91 | ht.insert (s); |
89 | |
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90 | return v; |
92 | return s; |
91 | } |
93 | } |
92 | |
94 | |
93 | // periodically test refcounts == 0 for a few strings |
95 | // periodically test refcounts == 0 for a few strings |
94 | // 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. |
95 | void |
97 | void |
96 | shstr::gc () |
98 | shstr::gc () |
97 | { |
99 | { |
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100 | if (expect_true (next_gc > 0)) |
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101 | return; |
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102 | |
98 | static const char *curpos; |
103 | static const char *curpos; |
99 | |
104 | |
100 | HT::iterator i = curpos ? ht.find (curpos) : ht.begin (); |
105 | auto (i, curpos ? ht.find (curpos) : ht.begin ()); |
101 | |
106 | |
102 | if (i == ht.end ()) |
107 | if (i == ht.end ()) |
103 | i = ht.begin (); |
108 | i = ht.begin (); |
104 | |
109 | |
105 | // go through all strings roughly once every 4 minutes |
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106 | int n = ht.size () / 256 + 16; |
110 | int n = ht.size () / 256 + 16; |
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111 | next_gc += n >> 1; |
107 | |
112 | |
108 | for (;;) |
113 | for (;;) |
109 | { |
114 | { |
110 | if (i == ht.end ()) |
115 | if (i == ht.end ()) |
111 | { |
116 | { |
… | |
… | |
114 | } |
119 | } |
115 | else if (!--n) |
120 | else if (!--n) |
116 | break; |
121 | break; |
117 | else if (!refcnt (*i)) |
122 | else if (!refcnt (*i)) |
118 | { |
123 | { |
119 | HT::iterator o = i++; |
124 | auto (o, i++); |
120 | const char *s = *o; |
125 | const char *s = *o; |
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126 | |
121 | ht.erase (o); |
127 | ht.erase (o); |
122 | |
128 | |
123 | //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)); |
124 | free (-2 + (int *)s); |
130 | shstr_alloc -= sizeof (int) * 2 + length (s) + 1; |
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131 | g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *) s); |
125 | } |
132 | } |
126 | else |
133 | else |
127 | ++i; |
134 | ++i; |
128 | } |
135 | } |
129 | |
136 | |
130 | curpos = *i; |
137 | curpos = *i; |
131 | } |
138 | } |
132 | |
139 | |
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140 | // declare these here to get correct initialisation order |
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141 | #define def(str) const shstr shstr_ ## str (# str); |
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142 | # include "shstrinc.h" |
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143 | #undef def |
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144 | |
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145 | shstr skill_names[NUM_SKILLS]; |
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146 | |
133 | //TODO: this should of course not be here |
147 | //TODO: this should of course not be here |
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148 | |
134 | /* buf_overflow() - we don't want to exceed the buffer size of |
149 | /* buf_overflow() - we don't want to exceed the buffer size of |
135 | * buf1 by adding on buf2! Returns true if overflow will occur. |
150 | * buf1 by adding on buf2! Returns true if overflow will occur. |
136 | */ |
151 | */ |
137 | |
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138 | int |
152 | int |
139 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
153 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
140 | { |
154 | { |
141 | int len1 = 0, len2 = 0; |
155 | int len1 = 0, len2 = 0; |
142 | |
156 | |
143 | if (buf1) |
157 | if (buf1) |
144 | len1 = strlen (buf1); |
158 | len1 = strlen (buf1); |
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159 | |
145 | if (buf2) |
160 | if (buf2) |
146 | len2 = strlen (buf2); |
161 | len2 = strlen (buf2); |
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162 | |
147 | if ((len1 + len2) >= bufsize) |
163 | if ((len1 + len2) >= bufsize) |
148 | return 1; |
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149 | return 0; |
164 | return 1; |
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165 | |
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166 | return 0; |
150 | } |
167 | } |
151 | |
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