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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 it under |
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7 | * the terms of the Affero GNU General Public License as published by the |
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8 | * Free Software Foundation, either version 3 of the License, or (at your |
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9 | * 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 Affero GNU General Public License |
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17 | * and the GNU General Public License along with this program. If not, see |
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18 | * <http://www.gnu.org/licenses/>. |
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19 | * |
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20 | * The authors can be reached via e-mail to <support@deliantra.net> |
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21 | */ |
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22 | |
1 | /* |
23 | /* |
2 | * shstr.C |
24 | * shstr.C |
3 | */ |
25 | */ |
4 | |
26 | |
5 | #include <cstring> |
27 | #include <cstring> |
6 | #include <cstdlib> |
28 | #include <cstdlib> |
7 | |
29 | #include <glib.h> |
8 | #include <tr1/unordered_set> |
30 | #include <tr1/unordered_set> |
9 | |
31 | |
10 | #include "shstr.h" |
32 | #include "global.h" |
11 | |
33 | |
12 | // NOTE: even with lots of stuff loaded, we do not usually have >>20000 strings. |
34 | size_t shstr_alloc; |
13 | // maybe refcounting is just overhead? |
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14 | |
35 | |
15 | struct hash |
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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; |
36 | typedef std::tr1::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *> > HT; |
51 | |
37 | |
52 | static HT ht; |
38 | static HT ht; |
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39 | static int next_gc; |
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40 | |
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41 | static const char * |
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42 | makevec (const char *s) |
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43 | { |
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44 | int len = strlen (s); |
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45 | int alloc = sizeof (uint32_t) * 2 + len + 1; |
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46 | |
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47 | shstr_alloc += alloc; |
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48 | char *v = (char *)g_slice_alloc (alloc); |
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49 | v += sizeof (uint32_t) * 2; |
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50 | |
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51 | shstr::length (v) = len; |
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52 | shstr::refcnt (v) = 1; |
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53 | |
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54 | memcpy (v, s, len + 1); |
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55 | |
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56 | return v; |
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57 | } |
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58 | |
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59 | shstr_vec<sizeof "(null)"> shstr_tmp::nullvec = { 0, 0xffffffff, "(null)" }; |
53 | |
60 | |
54 | const char * |
61 | const char * |
55 | shstr::find (const char *s) |
62 | shstr::find (const char *s) |
56 | { |
63 | { |
57 | if (!s) |
64 | if (!s) |
58 | return s; |
65 | return s; |
59 | |
66 | |
60 | HT::iterator i = ht.find (s); |
67 | auto (i, ht.find (s)); |
61 | |
68 | |
62 | return i != ht.end () |
69 | return i != ht.end ()? *i : 0; |
63 | ? *i |
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64 | : 0; |
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65 | } |
70 | } |
66 | |
71 | |
67 | const char * |
72 | const char * |
68 | shstr::intern (const char *s) |
73 | shstr::intern (const char *s) |
69 | { |
74 | { |
70 | if (!s) |
75 | if (!s) |
71 | return s; |
76 | return null (); |
72 | |
77 | |
73 | if (const char *found = find (s)) |
78 | if (const char *found = find (s)) |
74 | { |
79 | { |
75 | ++refcnt (found); |
80 | ++refcnt (found); |
76 | return found; |
81 | return found; |
77 | } |
82 | } |
78 | |
83 | |
79 | int len = strlen (s); |
84 | --next_gc; |
80 | |
85 | 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); |
86 | ht.insert (s); |
89 | |
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90 | return v; |
87 | return s; |
91 | } |
88 | } |
92 | |
89 | |
93 | // periodically test refcounts == 0 for a few strings |
90 | // periodically test refcounts == 0 for a few strings |
94 | // 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. |
95 | void |
92 | void |
96 | shstr::gc () |
93 | shstr::gc () |
97 | { |
94 | { |
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95 | if (expect_true (next_gc > 0)) |
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96 | return; |
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97 | |
98 | static const char *curpos; |
98 | static const char *curpos; |
99 | |
99 | |
100 | HT::iterator i = curpos ? ht.find (curpos) : ht.begin (); |
100 | auto (i, curpos ? ht.find (curpos) : ht.begin ()); |
101 | |
101 | |
102 | if (i == ht.end ()) |
102 | if (i == ht.end ()) |
103 | i = ht.begin (); |
103 | i = ht.begin (); |
104 | |
104 | |
105 | // go through all strings roughly once every 4 minutes |
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106 | for (int n = ht.size () / 256 + 16; --n; ) |
105 | int n = ht.size () / 256 + 16; |
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106 | next_gc += n >> 1; |
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107 | |
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108 | for (;;) |
107 | { |
109 | { |
108 | if (i == ht.end ()) |
110 | if (i == ht.end ()) |
109 | { |
111 | { |
110 | curpos = 0; |
112 | curpos = 0; |
111 | return; |
113 | return; |
112 | } |
114 | } |
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115 | else if (!--n) |
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116 | break; |
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117 | else if (!refcnt (*i)) |
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118 | { |
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119 | auto (o, i++); |
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120 | const char *s = *o; |
113 | |
121 | |
114 | if (!refcnt (*i)) |
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115 | { |
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116 | HT::iterator o = i++; |
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117 | const char *s = *o; |
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118 | ht.erase (o); |
122 | ht.erase (o); |
119 | |
123 | |
120 | //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)); |
121 | free (-2 + (int *)s); |
125 | int alloc = sizeof (uint32_t) * 2 + length (s) + 1; |
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126 | shstr_alloc -= alloc; |
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127 | g_slice_free1 (alloc, (void *)(s - sizeof (uint32_t) * 2)); |
122 | } |
128 | } |
123 | else |
129 | else |
124 | ++i; |
130 | ++i; |
125 | } |
131 | } |
126 | |
132 | |
127 | curpos = *i; |
133 | curpos = *i; |
128 | } |
134 | } |
129 | |
135 | |
130 | //TODO: this should of course not be here |
136 | // declare these here to get correct initialisation order |
131 | /* buf_overflow() - we don't want to exceed the buffer size of |
137 | #define def2(id,str) const shstr id (str); |
132 | * buf1 by adding on buf2! Returns true if overflow will occur. |
138 | #define def(id) def2(shstr_ ## id, # id) |
133 | */ |
139 | # include "shstrinc.h" |
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140 | #undef def |
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141 | #undef def2 |
134 | |
142 | |
135 | int |
143 | shstr skill_names[NUM_SKILLS]; |
136 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
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137 | { |
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138 | int len1 = 0, len2 = 0; |
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139 | |
144 | |
140 | if (buf1) |
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141 | len1 = strlen (buf1); |
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142 | if (buf2) |
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143 | len2 = strlen (buf2); |
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144 | if ((len1 + len2) >= bufsize) |
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145 | return 1; |
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146 | return 0; |
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147 | } |
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148 | |
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