server/common/shstr.C

/*
 * This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
 * 
 * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
 * 
 * Crossfire TRT is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 * The authors can be reached via e-mail to <crossfire@schmorp.de>
 */

/*
 * shstr.C
 */

#include <cstring>
#include <cstdlib>
#include <glib.h>
#include <tr1/unordered_set>

#include "global.h"

size_t shstr_alloc;

typedef std::tr1::unordered_set <const char *, str_hash, str_equal, slice_allocator<const char *>, true> HT;

static HT ht;

static const char *
makevec (const char *s)
{
  int len = strlen (s);

  shstr_alloc += sizeof (int) * 2 + len + 1;
  const char *v = (const char *) (2 + (int *)g_slice_alloc (sizeof (int) * 2 + len + 1));

  shstr::length (v) = len;
  shstr::refcnt (v) = 1;

  memcpy ((char *) v, s, len + 1);

  return v;
}

static const char *
makenull ()
{
  const char *s = makevec ("(null)");
  shstr::length (s) = 0;
  return s;
}

const char *shstr::null = makenull ();

const char *
shstr::find (const char *s)
{
  if (!s)
    return s;

  auto (i, ht.find (s));

  return i != ht.end ()? *i : 0;
}

const char *
shstr::intern (const char *s)
{
  if (!s)
    return null;

  if (const char *found = find (s))
    {
      ++refcnt (found);
      return found;
    }

  s = makevec (s);
  ht.insert (s);
  return s;
}

// periodically test refcounts == 0 for a few strings
// this is the ONLY thing that erases stuff from ht. keep it that way.
void
shstr::gc ()
{
  static const char *curpos;

  auto (i, curpos ? ht.find (curpos) : ht.begin ());

  if (i == ht.end ())
    i = ht.begin ();

  // go through all strings roughly once every 4 minutes
  int n = ht.size () / 256 + 16;

  for (;;)
    {
      if (i == ht.end ())
        {
          curpos = 0;
          return;
        }
      else if (!--n)
        break;
      else if (!refcnt (*i))
        {
          auto (o, i++);
          const char *s = *o;

          ht.erase (o);

          //printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s));
          shstr_alloc -= sizeof (int) * 2 + length (s) + 1;
          g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *) s);
        }
      else
        ++i;
    }

  curpos = *i;
}

// declare these here to get correct initialisation order
#define def(str) const shstr shstr_ ## str (# str);
# include "shstrinc.h"
#undef def

shstr skill_names[NUM_SKILLS];

//TODO: this should of course not be here

/* buf_overflow() - we don't want to exceed the buffer size of 
 * buf1 by adding on buf2! Returns true if overflow will occur.
 */
int
buf_overflow (const char *buf1, const char *buf2, int bufsize)
{
  int len1 = 0, len2 = 0;

  if (buf1)
    len1 = strlen (buf1);

  if (buf2)
    len2 = strlen (buf2);

  if ((len1 + len2) >= bufsize)
    return 1;

  return 0;
}
Revision:	1.26
Committed:	Tue Oct 16 05:34:24 2007 UTC (16 years, 7 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.25:	+6 -0 lines
Log Message:	add slice and shstr statistics
#	User	Rev	Content
1	elmex	1.1	/*
2	root	1.24	* This file is part of Crossfire TRT, the Roguelike Realtime MORPG.
3	root	1.23	*
4			* Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
5			*
6	root	1.24	* Crossfire TRT 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	root	1.23	*
11	root	1.24	* 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	root	1.23	*
16	root	1.24	* 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	root	1.23	*
19			* The authors can be reached via e-mail to <crossfire@schmorp.de>
20	root	1.22	*/
21
22			/*
23	root	1.3	* shstr.C
24	elmex	1.1	*/
25
26	root	1.3	#include <cstring>
27			#include <cstdlib>
28	root	1.10	#include <glib.h>
29	root	1.3	#include <tr1/unordered_set>
30	elmex	1.1
31	root	1.16	#include "global.h"
32	elmex	1.1
33	root	1.26	size_t shstr_alloc;
34
35	root	1.18	typedef std::tr1::unordered_set <const char , str_hash, str_equal, slice_allocator<const char >, true> HT;
36	elmex	1.1
37	root	1.16	static HT ht;
38	elmex	1.1
39	root	1.13	static const char *
40			makevec (const char *s)
41	root	1.7	{
42	root	1.17	int len = strlen (s);
43	root	1.7
44	root	1.26	shstr_alloc += sizeof (int) * 2 + len + 1;
45	root	1.18	const char v = (const char ) (2 + (int )g_slice_alloc (sizeof (int) 2 + len + 1));
46	root	1.7
47			shstr::length (v) = len;
48			shstr::refcnt (v) = 1;
49
50	root	1.13	memcpy ((char *) v, s, len + 1);
51	root	1.7
52	root	1.8	return v;
53	root	1.7	}
54
55	root	1.17	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 ();
64	root	1.15
65	elmex	1.1	const char *
66	root	1.3	shstr::find (const char *s)
67			{
68	root	1.4	if (!s)
69			return s;
70
71	root	1.21	auto (i, ht.find (s));
72	elmex	1.1
73	root	1.13	return i != ht.end ()? *i : 0;
74	elmex	1.1	}
75
76			const char *
77	root	1.3	shstr::intern (const char *s)
78			{
79	root	1.4	if (!s)
80	root	1.7	return null;
81	elmex	1.1
82	root	1.4	if (const char *found = find (s))
83	root	1.5	{
84			++refcnt (found);
85			return found;
86			}
87	elmex	1.1
88	root	1.7	s = makevec (s);
89			ht.insert (s);
90			return s;
91	elmex	1.1	}
92
93	root	1.5	// periodically test refcounts == 0 for a few strings
94			// this is the ONLY thing that erases stuff from ht. keep it that way.
95	elmex	1.1	void
96	root	1.3	shstr::gc ()
97			{
98	root	1.5	static const char *curpos;
99
100	root	1.21	auto (i, curpos ? ht.find (curpos) : ht.begin ());
101	root	1.5
102			if (i == ht.end ())
103			i = ht.begin ();
104
105			// go through all strings roughly once every 4 minutes
106	root	1.11	int n = ht.size () / 256 + 16;
107	root	1.6
108			for (;;)
109	root	1.5	{
110			if (i == ht.end ())
111			{
112			curpos = 0;
113			return;
114			}
115	root	1.6	else if (!--n)
116			break;
117			else if (!refcnt (*i))
118	root	1.5	{
119	root	1.21	auto (o, i++);
120	root	1.5	const char s = o;
121	root	1.13
122	root	1.5	ht.erase (o);
123
124			//printf ("GC %4d %3d %d >%s<%d\n", (int)ht.size (), n, shstr::refcnt (s), s, shstr::length (s));
125	root	1.26	shstr_alloc -= sizeof (int) * 2 + length (s) + 1;
126	root	1.13	g_slice_free1 (sizeof (int) * 2 + length (s) + 1, -2 + (int *) s);
127	root	1.5	}
128			else
129			++i;
130			}
131
132			curpos = *i;
133	elmex	1.1	}
134
135	root	1.25	// declare these here to get correct initialisation order
136			#define def(str) const shstr shstr_ ## str (# str);
137			# include "shstrinc.h"
138			#undef def
139
140	root	1.16	shstr skill_names[NUM_SKILLS];
141
142	root	1.5	//TODO: this should of course not be here
143	root	1.13
144	elmex	1.1	/* buf_overflow() - we don't want to exceed the buffer size of
145			* buf1 by adding on buf2! Returns true if overflow will occur.
146			*/
147	root	1.13	int
148	elmex	1.1	buf_overflow (const char buf1, const char buf2, int bufsize)
149			{
150	root	1.13	int len1 = 0, len2 = 0;
151	elmex	1.1
152	root	1.13	if (buf1)
153			len1 = strlen (buf1);
154	root	1.26
155	root	1.13	if (buf2)
156			len2 = strlen (buf2);
157	root	1.26
158	root	1.13	if ((len1 + len2) >= bufsize)
159			return 1;
160	root	1.22
161	root	1.13	return 0;
162	elmex	1.1	}