[bpt/guile.git] / src / objcodes.c

/* Copyright (C) 2001 Free Software Foundation, Inc.
 *
 * This program 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, 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for GUILE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.  */

#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <assert.h>

#include "programs.h"
#include "objcodes.h"

#define OBJCODE_COOKIE "GOOF-0.5"

\f
/*
 * Objcode type
 */

scm_t_bits scm_tc16_objcode;

static SCM
make_objcode (size_t size)
#define FUNC_NAME "make_objcode"
{
  struct scm_objcode *p = scm_gc_malloc (sizeof (struct scm_objcode),
					 "objcode");
  p->size = size;
  p->base = scm_gc_malloc (size, "objcode-base");
  p->fd   = -1;
  SCM_RETURN_NEWSMOB (scm_tc16_objcode, p);
}
#undef FUNC_NAME

static SCM
make_objcode_by_mmap (int fd)
#define FUNC_NAME "make_objcode_by_mmap"
{
  int ret;
  char *addr;
  struct stat st;
  struct scm_objcode *p;

  ret = fstat (fd, &st);
  if (ret < 0) SCM_SYSERROR;

  addr = mmap (0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
  if (addr == MAP_FAILED) SCM_SYSERROR;

  p = scm_gc_malloc (sizeof (struct scm_objcode), "objcode");
  p->size = st.st_size;
  p->base = addr;
  p->fd   = fd;
  SCM_RETURN_NEWSMOB (scm_tc16_objcode, p);
}
#undef FUNC_NAME

static scm_sizet
objcode_free (SCM obj)
#define FUNC_NAME "objcode_free"
{
  size_t size = sizeof (struct scm_objcode);
  struct scm_objcode *p = SCM_OBJCODE_DATA (obj);

  if (p->fd >= 0)
    {
      int rv;
      rv = munmap (p->base, p->size);
      if (rv < 0) SCM_SYSERROR;
      rv = close (p->fd);
      if (rv < 0) SCM_SYSERROR;
    }
  else
    scm_gc_free (p->base, p->size, "objcode-base");

  scm_gc_free (p, size, "objcode");

  return 0;
}
#undef FUNC_NAME

\f
/*
 * Scheme interface
 */

#if 0
SCM_DEFINE (scm_do_pair, "do-pair", 2, 0, 0,
	    (SCM car, SCM cdr),
	    "This is a stupid test to see how cells work.  (Ludo)")
{
  static SCM room[512];
  static SCM *where = &room[0];
  SCM the_pair;
  size_t incr;

  if ((scm_t_bits)where & 6)
    {
      /* Align the cell pointer so that Guile considers it as a
	 non-immediate object (see tags.h).  */
      incr = (scm_t_bits)where & 6;
      incr = (~incr) & 7;
      where += incr;
    }

  printf ("do-pair: pool @ %p, pair @ %p\n", &room[0], where);
  where[0] = car;
  where[1] = cdr;

  the_pair = PTR2SCM (where);
  /* This doesn't work because SCM_SET_GC_MARK will look for some sort of a
     "mark bitmap" at the end of a supposed cell segment which doesn't
     exist.  */

  return (the_pair);
}
#endif

SCM_DEFINE (scm_objcode_p, "objcode?", 1, 0, 0,
	    (SCM obj),
	    "")
#define FUNC_NAME s_scm_objcode_p
{
  return SCM_BOOL (SCM_OBJCODE_P (obj));
}
#undef FUNC_NAME

SCM_DEFINE (scm_bytecode_to_objcode, "bytecode->objcode", 3, 0, 0,
	    (SCM bytecode, SCM nlocs, SCM nexts),
	    "")
#define FUNC_NAME s_scm_bytecode_to_objcode
{
  size_t size;
  ssize_t increment;
  scm_t_array_handle handle;
  char *base;
  const char *c_bytecode;
  SCM objcode;

  if (scm_u8vector_p (bytecode) != SCM_BOOL_T)
    scm_wrong_type_arg (FUNC_NAME, 1, bytecode);
  SCM_VALIDATE_INUM (2, nlocs);
  SCM_VALIDATE_INUM (3, nexts);

  c_bytecode = scm_u8vector_elements (bytecode, &handle, &size, &increment);
  assert (increment == 1);

  /* Account for the 10 byte-long header.  */
  size += 10;
  objcode = make_objcode (size);
  base = SCM_OBJCODE_BASE (objcode);

  memcpy (base, OBJCODE_COOKIE, 8);
  base[8] = SCM_I_INUM (nlocs);
  base[9] = SCM_I_INUM (nexts);

  memcpy (base + 10, c_bytecode, size - 10);

  scm_array_handle_release (&handle);

  return objcode;
}
#undef FUNC_NAME

SCM_DEFINE (scm_load_objcode, "load-objcode", 1, 0, 0,
	    (SCM file),
	    "")
#define FUNC_NAME s_scm_load_objcode
{
  int fd;
  char *c_file;

  SCM_VALIDATE_STRING (1, file);

  c_file = scm_to_locale_string (file);
  fd = open (c_file, O_RDONLY);
  free (c_file);
  if (fd < 0) SCM_SYSERROR;

  return make_objcode_by_mmap (fd);
}
#undef FUNC_NAME

SCM_DEFINE (scm_objcode_to_u8vector, "objcode->u8vector", 1, 0, 0,
	    (SCM objcode),
	    "")
#define FUNC_NAME s_scm_objcode_to_u8vector
{
  char *u8vector;
  size_t size;

  SCM_VALIDATE_OBJCODE (1, objcode);

  size = SCM_OBJCODE_SIZE (objcode);
  /* FIXME:  Is `gc_malloc' ok here? */
  u8vector = scm_gc_malloc (size, "objcode-u8vector");
  memcpy (u8vector, SCM_OBJCODE_BASE (objcode), size);

  return scm_take_u8vector (u8vector, size);
}
#undef FUNC_NAME

SCM_DEFINE (scm_objcode_to_program, "objcode->program", 1, 0, 0,
	    (SCM objcode),
	    "")
#define FUNC_NAME s_scm_objcode_to_program
{
  SCM prog;
  size_t size;
  char *base;
  struct scm_program *p;

  SCM_VALIDATE_OBJCODE (1, objcode);

  base = SCM_OBJCODE_BASE (objcode);
  size = SCM_OBJCODE_SIZE (objcode);
  prog = scm_c_make_program (base + 10, size - 10, objcode);
  p = SCM_PROGRAM_DATA (prog);
  p->nlocs = base[8];
  p->nexts = base[9];
  return prog;
}
#undef FUNC_NAME

\f
void
scm_init_objcodes (void)
{
  scm_tc16_objcode = scm_make_smob_type ("objcode", 0);
  scm_set_smob_free (scm_tc16_objcode, objcode_free);

#ifndef SCM_MAGIC_SNARFER
#include "objcodes.x"
#endif
}

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/
Commit	Line	Data
8f5cfc81 KN	1	/* Copyright (C) 2001 Free Software Foundation, Inc.
	2	*
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the terms of the GNU General Public License as published by
	5	* the Free Software Foundation; either version 2, or (at your option)
	6	* any later version.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this software; see the file COPYING. If not, write to
	15	* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
	16	* Boston, MA 02111-1307 USA
	17	*
	18	* As a special exception, the Free Software Foundation gives permission
	19	* for additional uses of the text contained in its release of GUILE.
	20	*
	21	* The exception is that, if you link the GUILE library with other files
	22	* to produce an executable, this does not by itself cause the
	23	* resulting executable to be covered by the GNU General Public License.
	24	* Your use of that executable is in no way restricted on account of
	25	* linking the GUILE library code into it.
	26	*
	27	* This exception does not however invalidate any other reasons why
	28	* the executable file might be covered by the GNU General Public License.
	29	*
	30	* This exception applies only to the code released by the
	31	* Free Software Foundation under the name GUILE. If you copy
	32	* code from other Free Software Foundation releases into a copy of
	33	* GUILE, as the General Public License permits, the exception does
	34	* not apply to the code that you add in this way. To avoid misleading
	35	* anyone as to the status of such modified files, you must delete
	36	* this exception notice from them.
	37	*
	38	* If you write modifications of your own for GUILE, it is your choice
	39	* whether to permit this exception to apply to your modifications.
	40	* If you do not wish that, delete this exception notice. */
	41
	42	#include <string.h>
	43	#include <fcntl.h>
	44	#include <unistd.h>
	45	#include <sys/mman.h>
	46	#include <sys/stat.h>
	47	#include <sys/types.h>
054599f1	48	#include <assert.h>
8f5cfc81 KN	49
	50	#include "programs.h"
	51	#include "objcodes.h"
	52
	53	#define OBJCODE_COOKIE "GOOF-0.5"
	54
	55	\f
	56	/*
	57	* Objcode type
	58	*/
	59
f9e8c09d	60	scm_t_bits scm_tc16_objcode;
8f5cfc81 KN	61
	62	static SCM
	63	make_objcode (size_t size)
	64	#define FUNC_NAME "make_objcode"
	65	{
d8eeb67c LC	66	struct scm_objcode *p = scm_gc_malloc (sizeof (struct scm_objcode),
d8eeb67c LC	67	"objcode");
8f5cfc81	68	p->size = size;
d8eeb67c	69	p->base = scm_gc_malloc (size, "objcode-base");
8f5cfc81 KN	70	p->fd = -1;
	71	SCM_RETURN_NEWSMOB (scm_tc16_objcode, p);
	72	}
	73	#undef FUNC_NAME
	74
	75	static SCM
	76	make_objcode_by_mmap (int fd)
	77	#define FUNC_NAME "make_objcode_by_mmap"
	78	{
	79	int ret;
	80	char *addr;
	81	struct stat st;
	82	struct scm_objcode *p;
	83
	84	ret = fstat (fd, &st);
	85	if (ret < 0) SCM_SYSERROR;
	86
	87	addr = mmap (0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
	88	if (addr == MAP_FAILED) SCM_SYSERROR;
	89
d8eeb67c	90	p = scm_gc_malloc (sizeof (struct scm_objcode), "objcode");
8f5cfc81 KN	91	p->size = st.st_size;
	92	p->base = addr;
	93	p->fd = fd;
	94	SCM_RETURN_NEWSMOB (scm_tc16_objcode, p);
	95	}
	96	#undef FUNC_NAME
	97
	98	static scm_sizet
	99	objcode_free (SCM obj)
	100	#define FUNC_NAME "objcode_free"
	101	{
d8eeb67c	102	size_t size = sizeof (struct scm_objcode);
8f5cfc81 KN	103	struct scm_objcode *p = SCM_OBJCODE_DATA (obj);
	104
	105	if (p->fd >= 0)
	106	{
	107	int rv;
	108	rv = munmap (p->base, p->size);
	109	if (rv < 0) SCM_SYSERROR;
	110	rv = close (p->fd);
	111	if (rv < 0) SCM_SYSERROR;
	112	}
	113	else
d8eeb67c LC	114	scm_gc_free (p->base, p->size, "objcode-base");
	115
	116	scm_gc_free (p, size, "objcode");
8f5cfc81	117
d8eeb67c	118	return 0;
8f5cfc81 KN	119	}
	120	#undef FUNC_NAME
	121
	122	\f
	123	/*
	124	* Scheme interface
	125	*/
	126
135b32ee LC	127	#if 0
	128	SCM_DEFINE (scm_do_pair, "do-pair", 2, 0, 0,
	129	(SCM car, SCM cdr),
	130	"This is a stupid test to see how cells work. (Ludo)")
	131	{
	132	static SCM room[512];
	133	static SCM *where = &room[0];
	134	SCM the_pair;
	135	size_t incr;
	136
	137	if ((scm_t_bits)where & 6)
	138	{
	139	/* Align the cell pointer so that Guile considers it as a
	140	non-immediate object (see tags.h). */
	141	incr = (scm_t_bits)where & 6;
	142	incr = (~incr) & 7;
	143	where += incr;
	144	}
	145
	146	printf ("do-pair: pool @ %p, pair @ %p\n", &room[0], where);
	147	where[0] = car;
	148	where[1] = cdr;
	149
	150	the_pair = PTR2SCM (where);
	151	/* This doesn't work because SCM_SET_GC_MARK will look for some sort of a
	152	"mark bitmap" at the end of a supposed cell segment which doesn't
	153	exist. */
	154
	155	return (the_pair);
	156	}
	157	#endif
	158
8f5cfc81 KN	159	SCM_DEFINE (scm_objcode_p, "objcode?", 1, 0, 0,
	160	(SCM obj),
	161	"")
	162	#define FUNC_NAME s_scm_objcode_p
	163	{
	164	return SCM_BOOL (SCM_OBJCODE_P (obj));
	165	}
	166	#undef FUNC_NAME
	167
	168	SCM_DEFINE (scm_bytecode_to_objcode, "bytecode->objcode", 3, 0, 0,
	169	(SCM bytecode, SCM nlocs, SCM nexts),
	170	"")
	171	#define FUNC_NAME s_scm_bytecode_to_objcode
	172	{
	173	size_t size;
054599f1 LC	174	ssize_t increment;
	175	scm_t_array_handle handle;
	176	char *base;
	177	const char *c_bytecode;
8f5cfc81 KN	178	SCM objcode;
8f5cfc81 KN	179
054599f1 LC	180	if (scm_u8vector_p (bytecode) != SCM_BOOL_T)
054599f1 LC	181	scm_wrong_type_arg (FUNC_NAME, 1, bytecode);
8f5cfc81 KN	182	SCM_VALIDATE_INUM (2, nlocs);
	183	SCM_VALIDATE_INUM (3, nexts);
	184
054599f1 LC	185	c_bytecode = scm_u8vector_elements (bytecode, &handle, &size, &increment);
	186	assert (increment == 1);
	187
fa19602c LC	188	/* Account for the 10 byte-long header. */
fa19602c LC	189	size += 10;
8f5cfc81 KN	190	objcode = make_objcode (size);
	191	base = SCM_OBJCODE_BASE (objcode);
	192
	193	memcpy (base, OBJCODE_COOKIE, 8);
2d80426a LC	194	base[8] = SCM_I_INUM (nlocs);
2d80426a LC	195	base[9] = SCM_I_INUM (nexts);
d8eeb67c	196
d8eeb67c	197	memcpy (base + 10, c_bytecode, size - 10);
054599f1 LC	198
054599f1 LC	199	scm_array_handle_release (&handle);
d8eeb67c	200
8f5cfc81 KN	201	return objcode;
	202	}
	203	#undef FUNC_NAME
	204
	205	SCM_DEFINE (scm_load_objcode, "load-objcode", 1, 0, 0,
	206	(SCM file),
	207	"")
	208	#define FUNC_NAME s_scm_load_objcode
	209	{
	210	int fd;
2d80426a	211	char *c_file;
8f5cfc81 KN	212
	213	SCM_VALIDATE_STRING (1, file);
	214
2d80426a LC	215	c_file = scm_to_locale_string (file);
	216	fd = open (c_file, O_RDONLY);
	217	free (c_file);
8f5cfc81 KN	218	if (fd < 0) SCM_SYSERROR;
	219
	220	return make_objcode_by_mmap (fd);
	221	}
	222	#undef FUNC_NAME
	223
054599f1	224	SCM_DEFINE (scm_objcode_to_u8vector, "objcode->u8vector", 1, 0, 0,
8f5cfc81 KN	225	(SCM objcode),
8f5cfc81 KN	226	"")
054599f1	227	#define FUNC_NAME s_scm_objcode_to_u8vector
8f5cfc81	228	{
054599f1 LC	229	char *u8vector;
	230	size_t size;
	231
8f5cfc81	232	SCM_VALIDATE_OBJCODE (1, objcode);
054599f1 LC	233
	234	size = SCM_OBJCODE_SIZE (objcode);
	235	/* FIXME: Is `gc_malloc' ok here? */
	236	u8vector = scm_gc_malloc (size, "objcode-u8vector");
	237	memcpy (u8vector, SCM_OBJCODE_BASE (objcode), size);
	238
	239	return scm_take_u8vector (u8vector, size);
8f5cfc81 KN	240	}
	241	#undef FUNC_NAME
	242
	243	SCM_DEFINE (scm_objcode_to_program, "objcode->program", 1, 0, 0,
	244	(SCM objcode),
	245	"")
	246	#define FUNC_NAME s_scm_objcode_to_program
	247	{
	248	SCM prog;
	249	size_t size;
	250	char *base;
ac99cb0c	251	struct scm_program *p;
8f5cfc81 KN	252
	253	SCM_VALIDATE_OBJCODE (1, objcode);
	254
	255	base = SCM_OBJCODE_BASE (objcode);
	256	size = SCM_OBJCODE_SIZE (objcode);
	257	prog = scm_c_make_program (base + 10, size - 10, objcode);
ac99cb0c KN	258	p = SCM_PROGRAM_DATA (prog);
	259	p->nlocs = base[8];
	260	p->nexts = base[9];
8f5cfc81 KN	261	return prog;
	262	}
	263	#undef FUNC_NAME
	264
	265	\f
	266	void
	267	scm_init_objcodes (void)
	268	{
	269	scm_tc16_objcode = scm_make_smob_type ("objcode", 0);
	270	scm_set_smob_free (scm_tc16_objcode, objcode_free);
	271
	272	#ifndef SCM_MAGIC_SNARFER
	273	#include "objcodes.x"
	274	#endif
	275	}
	276
	277	/*
	278	Local Variables:
	279	c-file-style: "gnu"
	280	End:
	281	*/