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 <utime.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) << ")"

/////////////////////////////////////////////////////////////////////////////

static long get_stamp (int fd)
{
  struct stat st;

  if (fstat (fd, &st))
    FATAL ("could not get file stamp");

  return (long)st.st_mtime;
}

static void set_stamp (const std::string &path, long stamp)
{
  struct utimbuf ut;

  ut.actime  = stamp;
  ut.modtime = stamp;

  if (utime (path.c_str (), &ut))
    FATAL ("could not set file stamp");
}

env::env (const std::string &path, bool temporary)
: path(path), temporary(temporary)
{
  mode_t oflags = O_RDWR | O_EXCL;

  if (is_null (path))
    {
      this->path = tmpnam (0);

      temporary = true;
    }

  if (mkdir (this->path.c_str (), 0777) == 0)
    oflags |= O_CREAT;
  else
    if (temporary)
      FATAL ("error while creating libcpjit temporary directory" << ERRNO);
  
  idxpath = this->path + "/libcpjit.idx";
  idxfd = open (idxpath.c_str (), oflags, 0666);
  if (idxfd < 0)
    FATAL (path << ": unable to open index file" << idxpath);

  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 ()
{
  // caller must lock()

  long stamp = get_stamp (idxfd);

  if (stamp == idxstamp)
    return;

  idxstamp = stamp;

  // ... TODO
  
}

void
env::save_index ()
{
  // caller must lock()+load_index()

  // ... TODO
  set_stamp (idxpath, ++idxstamp);
}

/////////////////////////////////////////////////////////////////////////////

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:	1.8
Committed:	Fri Oct 14 02:29:59 2005 UTC (18 years, 9 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.7:	+52 -6 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	root	1.8	#include <utime.h>
45	root	1.2
46	root	1.4	#include "md5.h"
47
48	root	1.2	#include <dlfcn.h>
49	root	1.1
50			#define STR_(str) #str
51			#define STR(str) STR_(str)
52
53			namespace cpjit
54			{
55
56			const char typestr<U8 >::str[] = "unsigned " STR(TYPE_INT8);
57			const char typestr<U16 >::str[] = "unsigned " STR(TYPE_INT16);
58			const char typestr<U32 >::str[] = "unsigned " STR(TYPE_INT32);
59			const char typestr<U64 >::str[] = "unsigned " STR(TYPE_INT64);
60	root	1.2	const char typestr<I8 >::str[] = "signed " STR(TYPE_INT8);
61			const char typestr<I16 >::str[] = STR(TYPE_INT16);
62			const char typestr<I32 >::str[] = STR(TYPE_INT32);
63			const char typestr<I64 >::str[] = STR(TYPE_INT64);
64	root	1.4	const char typestr<FLT >::str[] = "float";
65			const char typestr<DBL >::str[] = "double";
66	root	1.1
67	root	1.2	const char typestr<PTR >::str[] = "void" " *";
68
69	root	1.1	const char typestr<U8 >::str[] = "unsigned " STR(TYPE_INT8) " ";
70			const char typestr<U16 >::str[] = "unsigned " STR(TYPE_INT16) " ";
71			const char typestr<U32 >::str[] = "unsigned " STR(TYPE_INT32) " ";
72			const char typestr<U64 >::str[] = "unsigned " STR(TYPE_INT64) " ";
73	root	1.2	const char typestr<I8 >::str[] = "signed " STR(TYPE_INT8) " ";
74			const char typestr<I16 >::str[] = STR(TYPE_INT16) " ";
75			const char typestr<I32 >::str[] = STR(TYPE_INT32) " ";
76			const char typestr<I64 >::str[] = STR(TYPE_INT64) " ";
77	root	1.4	const char typestr<FLT >::str[] = "float" " ";
78			const char typestr<DBL >::str[] = "double" " ";
79
80	root	1.8	/////////////////////////////////////////////////////////////////////////////
81
82	root	1.5	struct digest : md5_ctx
83	root	1.4	{
84	root	1.5	digest ();
85			void operator ()(const std::string &data);
86	root	1.4	operator std::string();
87			};
88
89	root	1.5	digest::digest ()
90	root	1.4	{
91	root	1.5	md5_init_ctx (this);
92			}
93	root	1.4
94	root	1.5	void digest::operator ()(const std::string &data)
95			{
96			md5_process_bytes (data.c_str (), data.size (), this);
97	root	1.4	}
98
99			digest::operator std::string ()
100			{
101	root	1.5	unsigned char data[16];
102	root	1.4	std::ostringstream s;
103
104	root	1.5	md5_finish_ctx (this, data);
105
106			for (int i = 0; i < 16; i++)
107	root	1.4	s << std::setfill ('0') << std::hex << std::setw (2) << (int)data [i];
108
109			return s.str ();
110			}
111	root	1.1
112	root	1.8	/////////////////////////////////////////////////////////////////////////////
113
114	root	1.2	static inline bool
115			is_null (const std::string &s)
116			{
117			return s.empty ();
118			}
119
120	root	1.8	/////////////////////////////////////////////////////////////////////////////
121
122	root	1.4	// error exception builder
123			struct error : std::ostringstream
124			{
125			~error ()
126			{
127			throw std::runtime_error (str ());
128			}
129			};
130
131			#define FATAL(msg) do { error o; o << msg << std::endl; } while (0)
132			#define ERRNO " (" << strerror (errno) << ")"
133
134	root	1.8	/////////////////////////////////////////////////////////////////////////////
135
136			static long get_stamp (int fd)
137			{
138			struct stat st;
139
140			if (fstat (fd, &st))
141			FATAL ("could not get file stamp");
142
143			return (long)st.st_mtime;
144			}
145
146			static void set_stamp (const std::string &path, long stamp)
147			{
148			struct utimbuf ut;
149
150			ut.actime = stamp;
151			ut.modtime = stamp;
152
153			if (utime (path.c_str (), &ut))
154			FATAL ("could not set file stamp");
155			}
156
157	root	1.2	env::env (const std::string &path, bool temporary)
158			: path(path), temporary(temporary)
159			{
160	root	1.6	mode_t oflags = O_RDWR \| O_EXCL;
161
162	root	1.2	if (is_null (path))
163			{
164			this->path = tmpnam (0);
165
166			temporary = true;
167			}
168
169	root	1.6	if (mkdir (this->path.c_str (), 0777) == 0)
170			oflags \|= O_CREAT;
171			else
172			if (temporary)
173			FATAL ("error while creating libcpjit temporary directory" << ERRNO);
174
175	root	1.8	idxpath = this->path + "/libcpjit.idx";
176			idxfd = open (idxpath.c_str (), oflags, 0666);
177	root	1.4	if (idxfd < 0)
178	root	1.8	FATAL (path << ": unable to open index file" << idxpath);
179	root	1.4
180			lock ();
181			load_index ();
182			unlock ();
183	root	1.2	}
184
185			env::~env ()
186			{
187			if (temporary)
188	root	1.5	clear ();
189			}
190
191			void env::clear ()
192			{
193			DIR *dir = opendir (path.c_str ());
194
195			if (dir)
196	root	1.2	{
197	root	1.5	struct dirent *de;
198			while ((de = readdir (dir)))
199	root	1.2	{
200	root	1.5	if (de->d_name [0] == '.')
201			continue;
202	root	1.2
203	root	1.5	std::string f = path + "/" + de->d_name;
204			unlink (f.c_str ());
205	root	1.2	}
206
207	root	1.5	closedir (dir);
208	root	1.2	}
209	root	1.5
210			if (rmdir (path.c_str ()))
211			FATAL (path << ": unable to remove libcpjit directory" << ERRNO);
212	root	1.2	}
213
214	root	1.4	void env::dolock (bool lock)
215			{
216			struct flock fl;
217
218			fl.l_type = lock ? F_WRLCK : F_UNLCK;
219			fl.l_whence = SEEK_SET;
220			fl.l_start = 0;
221			fl.l_len = 0;
222
223			while (fcntl (idxfd, F_SETLKW, &fl) < 0)
224			if (errno != EINTR)
225			FATAL (path << ": unable to lock index file" << ERRNO);
226			}
227
228			void env::lock ()
229			{
230			dolock (true);
231			}
232
233			void env::unlock ()
234			{
235			dolock (false);
236			}
237
238			void
239			env::load_index ()
240			{
241	root	1.8	// caller must lock()
242
243			long stamp = get_stamp (idxfd);
244
245			if (stamp == idxstamp)
246			return;
247
248			idxstamp = stamp;
249
250			// ... TODO
251
252	root	1.4	}
253
254	root	1.5	void
255			env::save_index ()
256	root	1.2	{
257	root	1.8	// caller must lock()+load_index()
258
259			// ... TODO
260			set_stamp (idxpath, ++idxstamp);
261	root	1.2	}
262
263	root	1.8	/////////////////////////////////////////////////////////////////////////////
264
265	root	1.5	fun::fun (env &e, const std::string &id, const std::string &source)
266			: e(e), id(id), source(source), funptr(0)
267	root	1.3	{
268			}
269
270	root	1.2	void *fun::ptr ()
271	root	1.1	{
272	root	1.2	if (!funptr)
273			{
274	root	1.5	e.lock ();
275			e.load_index ();
276
277			std::string base = e.path + "/" + id;
278	root	1.4
279			std::string fc = base + ".c";
280			std::string fo = base + ".o";
281			std::string fso = base + ".so";
282			std::string fa = base + ".a";
283	root	1.2
284			std::ofstream f (fc.c_str ());
285			f << source;
286			f.close ();
287
288			system (("gcc -O6 -c -o " + fo + " " + fc).c_str ());
289
290			unlink (fc.c_str ());
291
292			system (("gcc -O6 -nostdlib -lgcc -shared -o " + fso + " " + fo).c_str ());
293
294	root	1.4	printf ("%s\n", fso.c_str ());
295
296	root	1.2	void *so = dlopen (fso.c_str (), RTLD_LAZY);
297			assert (so);
298
299			funptr = dlsym (so, id.c_str ());
300			assert (funptr);
301	root	1.5
302			e.save_index ();
303			e.unlock ();
304	root	1.2	}
305
306			return funptr;
307	root	1.1	}
308
309	root	1.8	/////////////////////////////////////////////////////////////////////////////
310
311	root	1.5	funbuild::funbuild (env &e, const char *rettype, ...)
312			: e(e)
313	root	1.1	{
314	root	1.5	retlist = rettype;
315	root	1.3
316	root	1.5	std::ostringstream argl;
317	root	1.1
318			va_list ap;
319			va_start (ap, rettype);
320
321			int args = 0;
322			while ((rettype = va_arg (ap, const char *)))
323			{
324			if (args++)
325	root	1.5	argl << ", ";
326	root	1.1
327	root	1.5	argl << rettype << " a" << args;
328	root	1.1	}
329
330			va_end (ap);
331
332	root	1.5	arglist = argl.str ();
333	root	1.1	}
334
335	root	1.5	void
336			funbuild::finish (std::string &id, std::string &source)
337	root	1.1	{
338	root	1.5	digest dgst;
339
340			dgst (retlist);
341			dgst (arglist);
342			dgst (str ());
343
344			id = "f_" + (std::string) dgst;
345	root	1.3
346	root	1.5	std::ostringstream o;
347			o << retlist << " " << id << " (" << arglist << ")\n{\n" << str () << "\n}\n";
348			source = o.str ();
349	root	1.1	}
350
351			}