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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" |
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11 | #include "util.h" |
31 | #include "global.h" |
12 | |
32 | |
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33 | size_t shstr_alloc; |
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34 | |
13 | typedef std::tr1::unordered_set<const char *, str_hash, str_equal> HT; |
35 | typedef std::tr1::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *> > HT; |
14 | |
36 | |
15 | static HT ht; |
37 | static HT ht; |
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38 | static int next_gc; |
16 | |
39 | |
17 | static const char *makevec (const char *s) |
40 | static const char * |
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41 | makevec (const char *s) |
18 | { |
42 | { |
19 | int len = strlen (s); |
43 | int len = strlen (s); |
20 | |
44 | |
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45 | shstr_alloc += sizeof (int) * 2 + len + 1; |
21 | const char *v = (const char *)(2 + (int *)malloc (sizeof (int) * 2 + len + 1)); |
46 | const char *v = (const char *) (2 + (int *)g_slice_alloc (sizeof (int) * 2 + len + 1)); |
22 | |
47 | |
23 | shstr::length (v) = len; |
48 | shstr::length (v) = len; |
24 | shstr::refcnt (v) = 1; |
49 | shstr::refcnt (v) = 1; |
25 | |
50 | |
26 | memcpy ((char *)v, s, len + 1); |
51 | memcpy ((char *) v, s, len + 1); |
27 | |
52 | |
28 | return v; |
53 | return v; |
29 | } |
54 | } |
30 | |
55 | |
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56 | static const char * |
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57 | makenull () |
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58 | { |
31 | const char *shstr::null = makevec ("<nil>"); |
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 | } |
32 | |
63 | |
33 | // what weird misoptimisation is this again? |
64 | const char *shstr::null = makenull (); |
34 | const shstr undead_name ("undead"); |
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35 | |
65 | |
36 | const char * |
66 | const char * |
37 | shstr::find (const char *s) |
67 | shstr::find (const char *s) |
38 | { |
68 | { |
39 | if (!s) |
69 | if (!s) |
40 | return s; |
70 | return s; |
41 | |
71 | |
42 | HT::iterator i = ht.find (s); |
72 | auto (i, ht.find (s)); |
43 | |
73 | |
44 | return i != ht.end () |
74 | return i != ht.end ()? *i : 0; |
45 | ? *i |
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46 | : 0; |
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47 | } |
75 | } |
48 | |
76 | |
49 | const char * |
77 | const char * |
50 | shstr::intern (const char *s) |
78 | shstr::intern (const char *s) |
51 | { |
79 | { |
… | |
… | |
56 | { |
84 | { |
57 | ++refcnt (found); |
85 | ++refcnt (found); |
58 | return found; |
86 | return found; |
59 | } |
87 | } |
60 | |
88 | |
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89 | --next_gc; |
61 | s = makevec (s); |
90 | s = makevec (s); |
62 | ht.insert (s); |
91 | ht.insert (s); |
63 | return s; |
92 | return s; |
64 | } |
93 | } |
65 | |
94 | |
66 | // periodically test refcounts == 0 for a few strings |
95 | // periodically test refcounts == 0 for a few strings |
67 | // 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. |
68 | void |
97 | void |
69 | shstr::gc () |
98 | shstr::gc () |
70 | { |
99 | { |
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100 | if (expect_true (next_gc > 0)) |
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101 | return; |
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102 | |
71 | static const char *curpos; |
103 | static const char *curpos; |
72 | |
104 | |
73 | HT::iterator i = curpos ? ht.find (curpos) : ht.begin (); |
105 | auto (i, curpos ? ht.find (curpos) : ht.begin ()); |
74 | |
106 | |
75 | if (i == ht.end ()) |
107 | if (i == ht.end ()) |
76 | i = ht.begin (); |
108 | i = ht.begin (); |
77 | |
109 | |
78 | // go through all strings roughly once every 4 minutes |
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79 | int n = ht.size () / 256 + 16; |
110 | int n = ht.size () / 256 + 16; |
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111 | next_gc += n >> 1; |
80 | |
112 | |
81 | for (;;) |
113 | for (;;) |
82 | { |
114 | { |
83 | if (i == ht.end ()) |
115 | if (i == ht.end ()) |
84 | { |
116 | { |
… | |
… | |
87 | } |
119 | } |
88 | else if (!--n) |
120 | else if (!--n) |
89 | break; |
121 | break; |
90 | else if (!refcnt (*i)) |
122 | else if (!refcnt (*i)) |
91 | { |
123 | { |
92 | HT::iterator o = i++; |
124 | auto (o, i++); |
93 | const char *s = *o; |
125 | const char *s = *o; |
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126 | |
94 | ht.erase (o); |
127 | ht.erase (o); |
95 | |
128 | |
96 | //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)); |
97 | 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); |
98 | } |
132 | } |
99 | else |
133 | else |
100 | ++i; |
134 | ++i; |
101 | } |
135 | } |
102 | |
136 | |
103 | curpos = *i; |
137 | curpos = *i; |
104 | } |
138 | } |
105 | |
139 | |
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140 | const shstr shstr_null; |
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141 | |
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142 | // declare these here to get correct initialisation order |
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143 | #define def(str) const shstr shstr_ ## str (# str); |
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144 | # include "shstrinc.h" |
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145 | #undef def |
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146 | |
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147 | shstr skill_names[NUM_SKILLS]; |
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148 | |
106 | //TODO: this should of course not be here |
149 | //TODO: this should of course not be here |
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150 | |
107 | /* buf_overflow() - we don't want to exceed the buffer size of |
151 | /* buf_overflow() - we don't want to exceed the buffer size of |
108 | * buf1 by adding on buf2! Returns true if overflow will occur. |
152 | * buf1 by adding on buf2! Returns true if overflow will occur. |
109 | */ |
153 | */ |
110 | |
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111 | int |
154 | int |
112 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
155 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
113 | { |
156 | { |
114 | int len1 = 0, len2 = 0; |
157 | int len1 = 0, len2 = 0; |
115 | |
158 | |
116 | if (buf1) |
159 | if (buf1) |
117 | len1 = strlen (buf1); |
160 | len1 = strlen (buf1); |
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161 | |
118 | if (buf2) |
162 | if (buf2) |
119 | len2 = strlen (buf2); |
163 | len2 = strlen (buf2); |
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164 | |
120 | if ((len1 + len2) >= bufsize) |
165 | if ((len1 + len2) >= bufsize) |
121 | return 1; |
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122 | return 0; |
166 | return 1; |
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167 | |
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168 | return 0; |
123 | } |
169 | } |
124 | |
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