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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 | |
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8 | #include <glib.h> |
28 | #include <glib.h> |
9 | |
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10 | #include <tr1/unordered_set> |
29 | #include <tr1/unordered_set> |
11 | |
30 | |
12 | #include "shstr.h" |
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13 | #include "util.h" |
31 | #include "global.h" |
14 | |
32 | |
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33 | size_t shstr_alloc; |
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34 | |
15 | 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; |
16 | |
36 | |
17 | static HT ht; |
37 | static HT ht; |
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38 | static int next_gc; |
18 | |
39 | |
19 | static const char *makevec (const char *s) |
40 | static const char * |
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41 | makevec (const char *s) |
20 | { |
42 | { |
21 | int len = strlen (s); |
43 | int len = strlen (s); |
22 | |
44 | |
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45 | shstr_alloc += sizeof (uint32_t) * 2 + len + 1; |
23 | const char *v = (const char *)(2 + (int *)g_slice_alloc (sizeof (int) * 2 + len + 1)); |
46 | const char *v = (const char *) (2 + (int *)g_slice_alloc (sizeof (uint32_t) * 2 + len + 1)); |
24 | |
47 | |
25 | shstr::length (v) = len; |
48 | shstr::length (v) = len; |
26 | shstr::refcnt (v) = 1; |
49 | shstr::refcnt (v) = 1; |
27 | |
50 | |
28 | memcpy ((char *)v, s, len + 1); |
51 | memcpy ((char *) v, s, len + 1); |
29 | |
52 | |
30 | return v; |
53 | return v; |
31 | } |
54 | } |
32 | |
55 | |
33 | const char *shstr::null = makevec ("<nil>"); |
56 | shstr_vec<sizeof "(null)"> shstr_tmp::nullvec = { 0, 0xffffffff, "(null)" }; |
34 | |
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35 | // what weird misoptimisation is this again? |
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36 | const shstr undead_name ("undead"); |
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37 | |
57 | |
38 | const char * |
58 | const char * |
39 | shstr::find (const char *s) |
59 | shstr::find (const char *s) |
40 | { |
60 | { |
41 | if (!s) |
61 | if (!s) |
42 | return s; |
62 | return s; |
43 | |
63 | |
44 | HT::iterator i = ht.find (s); |
64 | auto (i, ht.find (s)); |
45 | |
65 | |
46 | return i != ht.end () |
66 | return i != ht.end ()? *i : 0; |
47 | ? *i |
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48 | : 0; |
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49 | } |
67 | } |
50 | |
68 | |
51 | const char * |
69 | const char * |
52 | shstr::intern (const char *s) |
70 | shstr::intern (const char *s) |
53 | { |
71 | { |
54 | if (!s) |
72 | if (!s) |
55 | return null; |
73 | return null (); |
56 | |
74 | |
57 | if (const char *found = find (s)) |
75 | if (const char *found = find (s)) |
58 | { |
76 | { |
59 | ++refcnt (found); |
77 | ++refcnt (found); |
60 | return found; |
78 | return found; |
61 | } |
79 | } |
62 | |
80 | |
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81 | --next_gc; |
63 | s = makevec (s); |
82 | s = makevec (s); |
64 | ht.insert (s); |
83 | ht.insert (s); |
65 | return s; |
84 | return s; |
66 | } |
85 | } |
67 | |
86 | |
68 | // periodically test refcounts == 0 for a few strings |
87 | // periodically test refcounts == 0 for a few strings |
69 | // this is the ONLY thing that erases stuff from ht. keep it that way. |
88 | // this is the ONLY thing that erases stuff from ht. keep it that way. |
70 | void |
89 | void |
71 | shstr::gc () |
90 | shstr::gc () |
72 | { |
91 | { |
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92 | if (expect_true (next_gc > 0)) |
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93 | return; |
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94 | |
73 | static const char *curpos; |
95 | static const char *curpos; |
74 | |
96 | |
75 | HT::iterator i = curpos ? ht.find (curpos) : ht.begin (); |
97 | auto (i, curpos ? ht.find (curpos) : ht.begin ()); |
76 | |
98 | |
77 | if (i == ht.end ()) |
99 | if (i == ht.end ()) |
78 | i = ht.begin (); |
100 | i = ht.begin (); |
79 | |
101 | |
80 | // go through all strings roughly once every 4 minutes |
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81 | int n = ht.size () / 256 + 16; |
102 | int n = ht.size () / 256 + 16; |
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103 | next_gc += n >> 1; |
82 | |
104 | |
83 | for (;;) |
105 | for (;;) |
84 | { |
106 | { |
85 | if (i == ht.end ()) |
107 | if (i == ht.end ()) |
86 | { |
108 | { |
… | |
… | |
89 | } |
111 | } |
90 | else if (!--n) |
112 | else if (!--n) |
91 | break; |
113 | break; |
92 | else if (!refcnt (*i)) |
114 | else if (!refcnt (*i)) |
93 | { |
115 | { |
94 | HT::iterator o = i++; |
116 | auto (o, i++); |
95 | const char *s = *o; |
117 | const char *s = *o; |
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118 | |
96 | ht.erase (o); |
119 | ht.erase (o); |
97 | |
120 | |
98 | int len = length (s); |
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99 | |
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100 | //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); |
121 | //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); |
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122 | shstr_alloc -= sizeof (uint32_t) * 2 + length (s) + 1; |
101 | g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *)s); |
123 | g_slice_free1 (sizeof (uint32_t) * 2 + length (s) + 1, -2 + (int *) s); |
102 | } |
124 | } |
103 | else |
125 | else |
104 | ++i; |
126 | ++i; |
105 | } |
127 | } |
106 | |
128 | |
107 | curpos = *i; |
129 | curpos = *i; |
108 | } |
130 | } |
109 | |
131 | |
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132 | // declare these here to get correct initialisation order |
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133 | #define def(str) const shstr shstr_ ## str (# str); |
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134 | # include "shstrinc.h" |
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135 | #undef def |
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136 | |
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137 | shstr skill_names[NUM_SKILLS]; |
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138 | |
110 | //TODO: this should of course not be here |
139 | //TODO: this should of course not be here |
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140 | |
111 | /* buf_overflow() - we don't want to exceed the buffer size of |
141 | /* buf_overflow() - we don't want to exceed the buffer size of |
112 | * buf1 by adding on buf2! Returns true if overflow will occur. |
142 | * buf1 by adding on buf2! Returns true if overflow will occur. |
113 | */ |
143 | */ |
114 | |
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115 | int |
144 | int |
116 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
145 | buf_overflow (const char *buf1, const char *buf2, int bufsize) |
117 | { |
146 | { |
118 | int len1 = 0, len2 = 0; |
147 | int len1 = 0, len2 = 0; |
119 | |
148 | |
120 | if (buf1) |
149 | if (buf1) |
121 | len1 = strlen (buf1); |
150 | len1 = strlen (buf1); |
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151 | |
122 | if (buf2) |
152 | if (buf2) |
123 | len2 = strlen (buf2); |
153 | len2 = strlen (buf2); |
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154 | |
124 | if ((len1 + len2) >= bufsize) |
155 | if ((len1 + len2) >= bufsize) |
125 | return 1; |
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126 | return 0; |
156 | return 1; |
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157 | |
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158 | return 0; |
127 | } |
159 | } |
128 | |
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