cvsroot/libcpjit/cpjit.C

/*
    cpjit.C -- c portable jit in time compiler
    Copyright (C) 2005      Marc Lehmann <cpjit@schmorp.de>
 
    This file is part of libcpjit.

    libcpjit 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 2 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 gvpe; if not, write to the Free Software
    Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "config.h"

#include "cpjit.h"

#include <cassert>
#include <cstdlib>
#include <cstdarg>
#include <cstdio>
#include <cstring>
#include <cerrno>

#include <sstream>
#include <fstream>
#include <stdexcept>
#include <iomanip>

#include <unistd.h>
#include <fcntl.h> // for locking

#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>

#include "md5.h"

#include <dlfcn.h>

#define STR_(str) #str
#define STR(str) STR_(str)

namespace cpjit
{

const char typestr<U8   >::str[] = "unsigned " STR(TYPE_INT8);
const char typestr<U16  >::str[] = "unsigned " STR(TYPE_INT16);
const char typestr<U32  >::str[] = "unsigned " STR(TYPE_INT32);
const char typestr<U64  >::str[] = "unsigned " STR(TYPE_INT64);
const char typestr<I8   >::str[] = "signed "   STR(TYPE_INT8);
const char typestr<I16  >::str[] =             STR(TYPE_INT16);
const char typestr<I32  >::str[] =             STR(TYPE_INT32);
const char typestr<I64  >::str[] =             STR(TYPE_INT64);
const char typestr<FLT  >::str[] = "float";
const char typestr<DBL  >::str[] = "double";

const char typestr<PTR  >::str[] = "void"                      " *";

const char typestr<U8  *>::str[] = "unsigned " STR(TYPE_INT8)  " *";
const char typestr<U16 *>::str[] = "unsigned " STR(TYPE_INT16) " *";
const char typestr<U32 *>::str[] = "unsigned " STR(TYPE_INT32) " *";
const char typestr<U64 *>::str[] = "unsigned " STR(TYPE_INT64) " *";
const char typestr<I8  *>::str[] = "signed "   STR(TYPE_INT8)  " *";
const char typestr<I16 *>::str[] =             STR(TYPE_INT16) " *";
const char typestr<I32 *>::str[] =             STR(TYPE_INT32) " *";
const char typestr<I64 *>::str[] =             STR(TYPE_INT64) " *";
const char typestr<FLT *>::str[] = "float"                     " *";
const char typestr<DBL *>::str[] = "double"                    " *";

struct digest : md5_ctx
{
  digest ();
  void operator ()(const std::string &data);
  operator std::string();
};

digest::digest ()
{
  md5_init_ctx (this);
}

void digest::operator ()(const std::string &data)
{
  md5_process_bytes (data.c_str (), data.size (), this);
}

digest::operator std::string ()
{
  unsigned char data[16];
  std::ostringstream s;

  md5_finish_ctx (this, data);

  for (int i = 0; i < 16; i++)
    s << std::setfill ('0') << std::hex << std::setw (2) << (int)data [i];

  return s.str ();
}

static inline bool
is_null (const std::string &s)
{
  return s.empty ();
}

// error exception builder
struct error : std::ostringstream
{
  ~error ()
  {
    throw std::runtime_error (str ());
  }
};

#define FATAL(msg) do { error o; o << msg << std::endl; } while (0)
#define ERRNO " (" << strerror (errno) << ")"

env::env (const std::string &path, bool temporary)
: path(path), temporary(temporary)
{
  if (is_null (path))
    {
      this->path = tmpnam (0);

      if (mkdir (this->path.c_str (), 0777))
        FATAL ("error while creating libcpjit temporary directory" << ERRNO);
  
      temporary = true;
    }

  std::string index = this->path + "/libcpjit.idx";

  idxfd = open (index.c_str (), O_RDWR|O_CREAT, 0666);

  if (idxfd < 0)
    FATAL (path << ": unable to open index file" << index);

  lock ();
  load_index ();
  unlock ();
}

env::~env ()
{
  if (temporary)
    clear ();
}

void env::clear ()
{
  DIR *dir = opendir (path.c_str ());

  if (dir)
    {
      struct dirent *de;
      while ((de = readdir (dir)))
        {
          if (de->d_name [0] == '.')
            continue;

          std::string f = path + "/" + de->d_name;
          unlink (f.c_str ());
        }

      closedir (dir);
    }

  if (rmdir (path.c_str ()))
    FATAL (path << ": unable to remove libcpjit directory" << ERRNO);
}

void env::dolock (bool lock)
{
  struct flock fl;

  fl.l_type   = lock ? F_WRLCK : F_UNLCK;
  fl.l_whence = SEEK_SET;
  fl.l_start  = 0;
  fl.l_len    = 0;

  while (fcntl (idxfd, F_SETLKW, &fl) < 0)
    if (errno != EINTR)
      FATAL (path << ": unable to lock index file" << ERRNO);
}

void env::lock ()
{
  dolock (true);
}

void env::unlock ()
{
  dolock (false);
}

void
env::load_index ()
{
  std::ifstream f ((this->path + "/libcpjit.idx").c_str ());
  assert (("not a cpjit directory", f));
  f.close ();
}

void
env::save_index ()
{
  std::ifstream f ((this->path + "/libcpjit.idx").c_str ());
  assert (("not a cpjit directory", f));
  f.close ();
}

fun::fun (env &e, const std::string &id, const std::string &source)
: e(e), id(id), source(source), funptr(0)
{
}

void *fun::ptr ()
{
  if (!funptr)
    {
      e.lock ();
      e.load_index ();

      std::string base = e.path + "/" + id;

      std::string fc  = base + ".c";
      std::string fo  = base + ".o";
      std::string fso = base + ".so";
      std::string fa  = base + ".a";

      std::ofstream f (fc.c_str ());
      f << source;
      f.close ();

      system (("gcc -O6 -c -o " + fo + " " + fc).c_str ());

      unlink (fc.c_str ());

      system (("gcc -O6 -nostdlib -lgcc -shared -o " + fso + " " + fo).c_str ());

      printf ("%s\n", fso.c_str ());

      void *so = dlopen (fso.c_str (), RTLD_LAZY);
      assert (so);

      funptr = dlsym (so, id.c_str ());
      assert (funptr);

      e.save_index ();
      e.unlock ();
    }

  return funptr;
}

funbuild::funbuild (env &e, const char *rettype, ...)
: e(e)
{
  retlist = rettype;

  std::ostringstream argl;

  va_list ap;
  va_start (ap, rettype);

  int args = 0;
  while ((rettype = va_arg (ap, const char *)))
    {
      if (args++)
        argl << ", ";

      argl << rettype << " a" << args;
    }

  va_end (ap);

  arglist = argl.str ();
}

void
funbuild::finish (std::string &id, std::string &source)
{
  digest dgst;

  dgst (retlist);
  dgst (arglist);
  dgst (str ());

  id = "f_" + (std::string) dgst;

  std::ostringstream o;
  o << retlist << " " << id << " (" << arglist << ")\n{\n" << str () << "\n}\n";
  source = o.str ();
}

}
Revision:	1.5
Committed:	Fri Oct 14 01:29:45 2005 UTC (20 years, 11 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.4:	+64 -59 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	/*
2			cpjit.C -- c portable jit in time compiler
3			Copyright (C) 2005 Marc Lehmann <cpjit@schmorp.de>
4
5			This file is part of libcpjit.
6
7			libcpjit is free software; you can redistribute it and/or modify
8			it under the terms of the GNU General Public License as published by
9			the Free Software Foundation; either version 2 of the License, or
10			(at your option) any later version.
11
12			This program is distributed in the hope that it will be useful,
13			but WITHOUT ANY WARRANTY; without even the implied warranty of
14			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			GNU General Public License for more details.
16
17			You should have received a copy of the GNU General Public License
18			along with gvpe; if not, write to the Free Software
19			Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			#include "config.h"
23
24			#include "cpjit.h"
25
26	root	1.2	#include <cassert>
27			#include <cstdlib>
28	root	1.1	#include <cstdarg>
29	root	1.2	#include <cstdio>
30	root	1.4	#include <cstring>
31			#include <cerrno>
32
33	root	1.1	#include <sstream>
34	root	1.2	#include <fstream>
35	root	1.4	#include <stdexcept>
36			#include <iomanip>
37
38			#include <unistd.h>
39			#include <fcntl.h> // for locking
40	root	1.2
41			#include <sys/stat.h>
42			#include <sys/types.h>
43			#include <dirent.h>
44
45	root	1.4	#include "md5.h"
46
47	root	1.2	#include <dlfcn.h>
48	root	1.1
49			#define STR_(str) #str
50			#define STR(str) STR_(str)
51
52			namespace cpjit
53			{
54
55			const char typestr<U8 >::str[] = "unsigned " STR(TYPE_INT8);
56			const char typestr<U16 >::str[] = "unsigned " STR(TYPE_INT16);
57			const char typestr<U32 >::str[] = "unsigned " STR(TYPE_INT32);
58			const char typestr<U64 >::str[] = "unsigned " STR(TYPE_INT64);
59	root	1.2	const char typestr<I8 >::str[] = "signed " STR(TYPE_INT8);
60			const char typestr<I16 >::str[] = STR(TYPE_INT16);
61			const char typestr<I32 >::str[] = STR(TYPE_INT32);
62			const char typestr<I64 >::str[] = STR(TYPE_INT64);
63	root	1.4	const char typestr<FLT >::str[] = "float";
64			const char typestr<DBL >::str[] = "double";
65	root	1.1
66	root	1.2	const char typestr<PTR >::str[] = "void" " *";
67
68	root	1.1	const char typestr<U8 >::str[] = "unsigned " STR(TYPE_INT8) " ";
69			const char typestr<U16 >::str[] = "unsigned " STR(TYPE_INT16) " ";
70			const char typestr<U32 >::str[] = "unsigned " STR(TYPE_INT32) " ";
71			const char typestr<U64 >::str[] = "unsigned " STR(TYPE_INT64) " ";
72	root	1.2	const char typestr<I8 >::str[] = "signed " STR(TYPE_INT8) " ";
73			const char typestr<I16 >::str[] = STR(TYPE_INT16) " ";
74			const char typestr<I32 >::str[] = STR(TYPE_INT32) " ";
75			const char typestr<I64 >::str[] = STR(TYPE_INT64) " ";
76	root	1.4	const char typestr<FLT >::str[] = "float" " ";
77			const char typestr<DBL >::str[] = "double" " ";
78
79	root	1.5	struct digest : md5_ctx
80	root	1.4	{
81	root	1.5	digest ();
82			void operator ()(const std::string &data);
83	root	1.4	operator std::string();
84			};
85
86	root	1.5	digest::digest ()
87	root	1.4	{
88	root	1.5	md5_init_ctx (this);
89			}
90	root	1.4
91	root	1.5	void digest::operator ()(const std::string &data)
92			{
93			md5_process_bytes (data.c_str (), data.size (), this);
94	root	1.4	}
95
96			digest::operator std::string ()
97			{
98	root	1.5	unsigned char data[16];
99	root	1.4	std::ostringstream s;
100
101	root	1.5	md5_finish_ctx (this, data);
102
103			for (int i = 0; i < 16; i++)
104	root	1.4	s << std::setfill ('0') << std::hex << std::setw (2) << (int)data [i];
105
106			return s.str ();
107			}
108	root	1.1
109	root	1.2	static inline bool
110			is_null (const std::string &s)
111			{
112			return s.empty ();
113			}
114
115	root	1.4	// error exception builder
116			struct error : std::ostringstream
117			{
118			~error ()
119			{
120			throw std::runtime_error (str ());
121			}
122			};
123
124			#define FATAL(msg) do { error o; o << msg << std::endl; } while (0)
125			#define ERRNO " (" << strerror (errno) << ")"
126
127	root	1.2	env::env (const std::string &path, bool temporary)
128			: path(path), temporary(temporary)
129			{
130			if (is_null (path))
131			{
132			this->path = tmpnam (0);
133
134			if (mkdir (this->path.c_str (), 0777))
135	root	1.4	FATAL ("error while creating libcpjit temporary directory" << ERRNO);
136	root	1.2
137			temporary = true;
138			}
139
140	root	1.4	std::string index = this->path + "/libcpjit.idx";
141
142			idxfd = open (index.c_str (), O_RDWR\|O_CREAT, 0666);
143
144			if (idxfd < 0)
145			FATAL (path << ": unable to open index file" << index);
146
147			lock ();
148			load_index ();
149			unlock ();
150	root	1.2	}
151
152			env::~env ()
153			{
154			if (temporary)
155	root	1.5	clear ();
156			}
157
158			void env::clear ()
159			{
160			DIR *dir = opendir (path.c_str ());
161
162			if (dir)
163	root	1.2	{
164	root	1.5	struct dirent *de;
165			while ((de = readdir (dir)))
166	root	1.2	{
167	root	1.5	if (de->d_name [0] == '.')
168			continue;
169	root	1.2
170	root	1.5	std::string f = path + "/" + de->d_name;
171			unlink (f.c_str ());
172	root	1.2	}
173
174	root	1.5	closedir (dir);
175	root	1.2	}
176	root	1.5
177			if (rmdir (path.c_str ()))
178			FATAL (path << ": unable to remove libcpjit directory" << ERRNO);
179	root	1.2	}
180
181	root	1.4	void env::dolock (bool lock)
182			{
183			struct flock fl;
184
185			fl.l_type = lock ? F_WRLCK : F_UNLCK;
186			fl.l_whence = SEEK_SET;
187			fl.l_start = 0;
188			fl.l_len = 0;
189
190			while (fcntl (idxfd, F_SETLKW, &fl) < 0)
191			if (errno != EINTR)
192			FATAL (path << ": unable to lock index file" << ERRNO);
193			}
194
195			void env::lock ()
196			{
197			dolock (true);
198			}
199
200			void env::unlock ()
201			{
202			dolock (false);
203			}
204
205			void
206			env::load_index ()
207			{
208			std::ifstream f ((this->path + "/libcpjit.idx").c_str ());
209			assert (("not a cpjit directory", f));
210			f.close ();
211			}
212
213	root	1.5	void
214			env::save_index ()
215	root	1.2	{
216	root	1.5	std::ifstream f ((this->path + "/libcpjit.idx").c_str ());
217			assert (("not a cpjit directory", f));
218			f.close ();
219	root	1.2	}
220
221	root	1.5	fun::fun (env &e, const std::string &id, const std::string &source)
222			: e(e), id(id), source(source), funptr(0)
223	root	1.3	{
224			}
225
226	root	1.2	void *fun::ptr ()
227	root	1.1	{
228	root	1.2	if (!funptr)
229			{
230	root	1.5	e.lock ();
231			e.load_index ();
232
233			std::string base = e.path + "/" + id;
234	root	1.4
235			std::string fc = base + ".c";
236			std::string fo = base + ".o";
237			std::string fso = base + ".so";
238			std::string fa = base + ".a";
239	root	1.2
240			std::ofstream f (fc.c_str ());
241			f << source;
242			f.close ();
243
244			system (("gcc -O6 -c -o " + fo + " " + fc).c_str ());
245
246			unlink (fc.c_str ());
247
248			system (("gcc -O6 -nostdlib -lgcc -shared -o " + fso + " " + fo).c_str ());
249
250	root	1.4	printf ("%s\n", fso.c_str ());
251
252	root	1.2	void *so = dlopen (fso.c_str (), RTLD_LAZY);
253			assert (so);
254
255			funptr = dlsym (so, id.c_str ());
256			assert (funptr);
257	root	1.5
258			e.save_index ();
259			e.unlock ();
260	root	1.2	}
261
262			return funptr;
263	root	1.1	}
264
265	root	1.5	funbuild::funbuild (env &e, const char *rettype, ...)
266			: e(e)
267	root	1.1	{
268	root	1.5	retlist = rettype;
269	root	1.3
270	root	1.5	std::ostringstream argl;
271	root	1.1
272			va_list ap;
273			va_start (ap, rettype);
274
275			int args = 0;
276			while ((rettype = va_arg (ap, const char *)))
277			{
278			if (args++)
279	root	1.5	argl << ", ";
280	root	1.1
281	root	1.5	argl << rettype << " a" << args;
282	root	1.1	}
283
284			va_end (ap);
285
286	root	1.5	arglist = argl.str ();
287	root	1.1	}
288
289	root	1.5	void
290			funbuild::finish (std::string &id, std::string &source)
291	root	1.1	{
292	root	1.5	digest dgst;
293
294			dgst (retlist);
295			dgst (arglist);
296			dgst (str ());
297
298			id = "f_" + (std::string) dgst;
299	root	1.3
300	root	1.5	std::ostringstream o;
301			o << retlist << " " << id << " (" << arglist << ")\n{\n" << str () << "\n}\n";
302			source = o.str ();
303	root	1.1	}
304
305			}