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3 | */ |
3 | */ |
4 | |
4 | |
5 | #include <cstring> |
5 | #include <cstring> |
6 | #include <cstdlib> |
6 | #include <cstdlib> |
7 | |
7 | |
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8 | #include <glib.h> |
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9 | |
8 | #include <tr1/unordered_set> |
10 | #include <tr1/unordered_set> |
9 | |
11 | |
10 | #include "shstr.h" |
12 | #include "shstr.h" |
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13 | #include "util.h" |
11 | |
14 | |
12 | struct hash |
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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; |
15 | typedef std::tr1::unordered_set<const char *, str_hash, str_equal> HT; |
48 | |
16 | |
49 | static HT ht; |
17 | static HT ht; |
50 | |
18 | |
51 | static const char *makevec (const char *s) |
19 | static const char *makevec (const char *s) |
52 | { |
20 | { |
53 | int len = strlen (s); |
21 | int len = strlen (s); |
54 | |
22 | |
55 | const char *v = (const char *)(2 + (int *)malloc (sizeof (int) * 2 + len + 1)); |
23 | const char *v = (const char *)(2 + (int *)g_slice_alloc (sizeof (int) * 2 + len + 1)); |
56 | |
24 | |
57 | shstr::length (v) = len; |
25 | shstr::length (v) = len; |
58 | shstr::refcnt (v) = 1; |
26 | shstr::refcnt (v) = 1; |
59 | |
27 | |
60 | memcpy ((char *)v, s, len + 1); |
28 | memcpy ((char *)v, s, len + 1); |
61 | |
29 | |
62 | return s; |
30 | return v; |
63 | } |
31 | } |
64 | |
32 | |
65 | const char *shstr::null = makevec ("<nil>"); |
33 | const char *shstr::null = makevec ("<nil>"); |
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34 | |
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35 | // what weird misoptimisation is this again? |
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36 | const shstr undead_name ("undead"); |
66 | |
37 | |
67 | const char * |
38 | const char * |
68 | shstr::find (const char *s) |
39 | shstr::find (const char *s) |
69 | { |
40 | { |
70 | if (!s) |
41 | if (!s) |
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122 | { |
93 | { |
123 | HT::iterator o = i++; |
94 | HT::iterator o = i++; |
124 | const char *s = *o; |
95 | const char *s = *o; |
125 | ht.erase (o); |
96 | ht.erase (o); |
126 | |
97 | |
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98 | int len = length (s); |
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99 | |
127 | //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); |
100 | //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s)); |
128 | free (-2 + (int *)s); |
101 | g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *)s); |
129 | } |
102 | } |
130 | else |
103 | else |
131 | ++i; |
104 | ++i; |
132 | } |
105 | } |
133 | |
106 | |