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