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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 (©) 2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015,2016 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> |
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29 | #include <glib.h> |
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30 | #include <unordered_set> |
7 | |
31 | |
8 | #include <tr1/unordered_set> |
32 | #include "global.h" |
9 | |
33 | |
10 | #include "shstr.h" |
34 | size_t shstr_alloc; |
11 | |
35 | |
12 | struct hash |
36 | typedef std::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *> > HT; |
13 | { |
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14 | std::size_t operator ()(const char *s) const |
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15 | { |
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16 | unsigned long hash = 0; |
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17 | unsigned int i = 0; |
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18 | |
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19 | /* use the one-at-a-time hash function, which supposedly is |
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20 | * better than the djb2-like one used by perl5.005, but |
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21 | * certainly is better then the bug used here before. |
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22 | * see http://burtleburtle.net/bob/hash/doobs.html |
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23 | */ |
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24 | while (*s) |
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25 | { |
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26 | hash += *s++; |
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27 | hash += hash << 10; |
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28 | hash ^= hash >> 6; |
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29 | } |
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30 | |
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31 | hash += hash << 3; |
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32 | hash ^= hash >> 11; |
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33 | hash += hash << 15; |
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34 | |
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35 | return hash; |
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36 | } |
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37 | }; |
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38 | |
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39 | struct equal |
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40 | { |
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41 | bool operator ()(const char *a, const char *b) const |
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42 | { |
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43 | return !strcmp (a, b); |
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44 | } |
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45 | }; |
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46 | |
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47 | typedef std::tr1::unordered_set<const char *, hash, equal> HT; |
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48 | |
37 | |
49 | static HT ht; |
38 | static HT ht; |
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39 | static int next_gc; |
50 | |
40 | |
51 | static const char *makevec (const char *s) |
41 | #define NUM_INT 3 |
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42 | |
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43 | static const char * |
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44 | makevec (const char *s) |
52 | { |
45 | { |
53 | int len = strlen (s); |
46 | int len = strlen (s); |
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47 | int alloc = sizeof (uint32_t) * NUM_INT + len + 1; |
54 | |
48 | |
55 | const char *v = (const char *)(2 + (int *)malloc (sizeof (int) * 2 + len + 1)); |
49 | shstr_alloc += alloc; |
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50 | char *v = (char *)g_slice_alloc (alloc); |
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51 | v += sizeof (uint32_t) * NUM_INT; |
56 | |
52 | |
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53 | shstr::hash (v) = strhsh (s); |
57 | shstr::length (v) = len; |
54 | shstr::length (v) = len; |
58 | shstr::refcnt (v) = 1; |
55 | shstr::refcnt (v) = 1; |
59 | |
56 | |
60 | memcpy ((char *)v, s, len + 1); |
57 | memcpy (v, s, len + 1); |
61 | |
58 | |
62 | return v; |
59 | return v; |
63 | } |
60 | } |
64 | |
61 | |
65 | const char *shstr::null = makevec ("<nil>"); |
62 | shstr_vec<sizeof "(null)"> shstr_tmp::nullvec = { STRHSH_NULL, 0, 0xffffffff, "(null)" }; |
66 | |
63 | |
67 | // what weird misoptimisation is this again? |
64 | bool |
68 | const shstr undead_name ("undead"); |
65 | shstr_tmp::contains (const char *substring) const |
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66 | { |
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67 | //TODO: this is supposed to check for comma-seperation... |
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68 | return s != null () |
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69 | && substring |
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70 | && strstr (s, substring); |
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71 | } |
69 | |
72 | |
70 | const char * |
73 | const char * |
71 | shstr::find (const char *s) |
74 | shstr::find (const char *s) |
72 | { |
75 | { |
73 | if (!s) |
76 | if (!s) |
74 | return s; |
77 | return s; |
75 | |
78 | |
76 | HT::iterator i = ht.find (s); |
79 | auto (i, ht.find (s)); |
77 | |
80 | |
78 | return i != ht.end () |
81 | return i != ht.end ()? *i : 0; |
79 | ? *i |
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80 | : 0; |
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81 | } |
82 | } |
82 | |
83 | |
83 | const char * |
84 | const char * |
84 | shstr::intern (const char *s) |
85 | shstr::intern (const char *s) |
85 | { |
86 | { |
86 | if (!s) |
87 | if (!s) |
87 | return null; |
88 | return null (); |
88 | |
89 | |
89 | if (const char *found = find (s)) |
90 | if (const char *found = find (s)) |
90 | { |
91 | { |
91 | ++refcnt (found); |
92 | ++refcnt (found); |
92 | return found; |
93 | return found; |
93 | } |
94 | } |
94 | |
95 | |
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96 | --next_gc; |
95 | s = makevec (s); |
97 | s = makevec (s); |
96 | ht.insert (s); |
98 | ht.insert (s); |
97 | return s; |
99 | return s; |
98 | } |
100 | } |
99 | |
101 | |
100 | // periodically test refcounts == 0 for a few strings |
102 | // periodically test refcounts == 0 for a few strings |
101 | // this is the ONLY thing that erases stuff from ht. keep it that way. |
103 | // this is the ONLY thing that erases stuff from ht. keep it that way. |
102 | void |
104 | void |
103 | shstr::gc () |
105 | shstr::gc () |
104 | { |
106 | { |
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107 | if (expect_true (next_gc > 0)) |
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108 | return; |
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109 | |
105 | static const char *curpos; |
110 | static const char *curpos; |
106 | |
111 | |
107 | HT::iterator i = curpos ? ht.find (curpos) : ht.begin (); |
112 | auto (i, curpos ? ht.find (curpos) : ht.begin ()); |
108 | |
113 | |
109 | if (i == ht.end ()) |
114 | if (i == ht.end ()) |
110 | i = ht.begin (); |
115 | i = ht.begin (); |
111 | |
116 | |
112 | // go through all strings roughly once every 4 minutes |
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113 | int n = ht.size () / 256 + 16; |
117 | int n = ht.size () / 256 + 16; |
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118 | next_gc += n >> 1; |
114 | |
119 | |
115 | for (;;) |
120 | for (;;) |
116 | { |
121 | { |
117 | if (i == ht.end ()) |
122 | if (i == ht.end ()) |
118 | { |
123 | { |
… | |
… | |
121 | } |
126 | } |
122 | else if (!--n) |
127 | else if (!--n) |
123 | break; |
128 | break; |
124 | else if (!refcnt (*i)) |
129 | else if (!refcnt (*i)) |
125 | { |
130 | { |
126 | HT::iterator o = i++; |
131 | auto (o, i++); |
127 | const char *s = *o; |
132 | const char *s = *o; |
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133 | |
128 | ht.erase (o); |
134 | ht.erase (o); |
129 | |
135 | |
130 | //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); |
136 | //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); |
131 | free (-2 + (int *)s); |
137 | int alloc = sizeof (uint32_t) * NUM_INT + length (s) + 1; |
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138 | shstr_alloc -= alloc; |
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139 | g_slice_free1 (alloc, (void *)(s - sizeof (uint32_t) * NUM_INT)); |
132 | } |
140 | } |
133 | else |
141 | else |
134 | ++i; |
142 | ++i; |
135 | } |
143 | } |
136 | |
144 | |
137 | curpos = *i; |
145 | curpos = *i; |
138 | } |
146 | } |
139 | |
147 | |
140 | //TODO: this should of course not be here |
148 | // declare these here to get correct initialisation order |
141 | /* buf_overflow() - we don't want to exceed the buffer size of |
149 | #define def2(id,str) const shstr id (str); |
142 | * buf1 by adding on buf2! Returns true if overflow will occur. |
150 | #define def(id) def2(shstr_ ## id, # id) |
143 | */ |
151 | # include "shstrinc.h" |
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152 | #undef def |
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153 | #undef def2 |
144 | |
154 | |
145 | int |
155 | materialtype_t material_null; |
146 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
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147 | { |
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148 | int len1 = 0, len2 = 0; |
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149 | |
156 | |
150 | if (buf1) |
157 | struct freed_map freed_map; |
151 | len1 = strlen (buf1); |
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152 | if (buf2) |
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153 | len2 = strlen (buf2); |
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154 | if ((len1 + len2) >= bufsize) |
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155 | return 1; |
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156 | return 0; |
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157 | } |
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158 | |
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