src/objcodes.c

   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>
  48 #include <assert.h>
  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
  60 scm_t_bits scm_tc16_objcode;
  61
  62 static SCM
  63 make_objcode (size_t size)
  64 #define FUNC_NAME "make_objcode"
  65 {
  66   struct scm_objcode *p = scm_gc_malloc (sizeof (struct scm_objcode),
  67                                          "objcode");
  68   p->size = size;
  69   p->base = scm_gc_malloc (size, "objcode-base");
  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)
  86     SCM_SYSERROR;
  87
  88   if (st.st_size <= strlen (OBJCODE_COOKIE))
  89     scm_misc_error (FUNC_NAME, "object file too small (~a bytes)",
  90                     SCM_LIST1 (SCM_I_MAKINUM (st.st_size)));
  91
  92   addr = mmap (0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
  93   if (addr == MAP_FAILED)
  94     SCM_SYSERROR;
  95
  96   if (memcmp (addr, OBJCODE_COOKIE, strlen (OBJCODE_COOKIE)))
  97     SCM_SYSERROR;
  98
  99   p = scm_gc_malloc (sizeof (struct scm_objcode), "objcode");
 100   p->size = st.st_size;
 101   p->base = addr;
 102   p->fd   = fd;
 103   SCM_RETURN_NEWSMOB (scm_tc16_objcode, p);
 104 }
 105 #undef FUNC_NAME
 106
 107 static scm_sizet
 108 objcode_free (SCM obj)
 109 #define FUNC_NAME "objcode_free"
 110 {
 111   size_t size = sizeof (struct scm_objcode);
 112   struct scm_objcode *p = SCM_OBJCODE_DATA (obj);
 113
 114   if (p->fd >= 0)
 115     {
 116       int rv;
 117       rv = munmap (p->base, p->size);
 118       if (rv < 0) SCM_SYSERROR;
 119       rv = close (p->fd);
 120       if (rv < 0) SCM_SYSERROR;
 121     }
 122   else
 123     scm_gc_free (p->base, p->size, "objcode-base");
 124
 125   scm_gc_free (p, size, "objcode");
 126
 127   return 0;
 128 }
 129 #undef FUNC_NAME
 130
 131 \f
 132 /*
 133  * Scheme interface
 134  */
 135
 136 #if 0
 137 SCM_DEFINE (scm_do_pair, "do-pair", 2, 0, 0,
 138             (SCM car, SCM cdr),
 139             "This is a stupid test to see how cells work.  (Ludo)")
 140 {
 141   static SCM room[512];
 142   static SCM *where = &room[0];
 143   SCM the_pair;
 144   size_t incr;
 145
 146   if ((scm_t_bits)where & 6)
 147     {
 148       /* Align the cell pointer so that Guile considers it as a
 149          non-immediate object (see tags.h).  */
 150       incr = (scm_t_bits)where & 6;
 151       incr = (~incr) & 7;
 152       where += incr;
 153     }
 154
 155   printf ("do-pair: pool @ %p, pair @ %p\n", &room[0], where);
 156   where[0] = car;
 157   where[1] = cdr;
 158
 159   the_pair = PTR2SCM (where);
 160   /* This doesn't work because SCM_SET_GC_MARK will look for some sort of a
 161      "mark bitmap" at the end of a supposed cell segment which doesn't
 162      exist.  */
 163
 164   return (the_pair);
 165 }
 166 #endif
 167
 168 SCM_DEFINE (scm_objcode_p, "objcode?", 1, 0, 0,
 169             (SCM obj),
 170             "")
 171 #define FUNC_NAME s_scm_objcode_p
 172 {
 173   return SCM_BOOL (SCM_OBJCODE_P (obj));
 174 }
 175 #undef FUNC_NAME
 176
 177 SCM_DEFINE (scm_bytecode_to_objcode, "bytecode->objcode", 3, 0, 0,
 178             (SCM bytecode, SCM nlocs, SCM nexts),
 179             "")
 180 #define FUNC_NAME s_scm_bytecode_to_objcode
 181 {
 182   size_t size;
 183   ssize_t increment;
 184   scm_t_array_handle handle;
 185   char *base;
 186   const scm_t_uint8 *c_bytecode;
 187   SCM objcode;
 188
 189   if (scm_u8vector_p (bytecode) != SCM_BOOL_T)
 190     scm_wrong_type_arg (FUNC_NAME, 1, bytecode);
 191   SCM_VALIDATE_NUMBER (2, nlocs);
 192   SCM_VALIDATE_NUMBER (3, nexts);
 193
 194   c_bytecode = scm_u8vector_elements (bytecode, &handle, &size, &increment);
 195   assert (increment == 1);
 196
 197   /* Account for the 10 byte-long header.  */
 198   size += 10;
 199   objcode = make_objcode (size);
 200   base = SCM_OBJCODE_BASE (objcode);
 201
 202   memcpy (base, OBJCODE_COOKIE, 8);
 203   base[8] = scm_to_uint8 (nlocs);
 204   base[9] = scm_to_uint8 (nexts);
 205
 206   memcpy (base + 10, c_bytecode, size - 10);
 207
 208   scm_array_handle_release (&handle);
 209
 210   return objcode;
 211 }
 212 #undef FUNC_NAME
 213
 214 SCM_DEFINE (scm_load_objcode, "load-objcode", 1, 0, 0,
 215             (SCM file),
 216             "")
 217 #define FUNC_NAME s_scm_load_objcode
 218 {
 219   int fd;
 220   char *c_file;
 221
 222   SCM_VALIDATE_STRING (1, file);
 223
 224   c_file = scm_to_locale_string (file);
 225   fd = open (c_file, O_RDONLY);
 226   free (c_file);
 227   if (fd < 0) SCM_SYSERROR;
 228
 229   return make_objcode_by_mmap (fd);
 230 }
 231 #undef FUNC_NAME
 232
 233 SCM_DEFINE (scm_objcode_to_u8vector, "objcode->u8vector", 1, 0, 0,
 234             (SCM objcode),
 235             "")
 236 #define FUNC_NAME s_scm_objcode_to_u8vector
 237 {
 238   scm_t_uint8 *u8vector;
 239   size_t size;
 240
 241   SCM_VALIDATE_OBJCODE (1, objcode);
 242
 243   size = SCM_OBJCODE_SIZE (objcode);
 244   /* FIXME:  Is `gc_malloc' ok here? */
 245   u8vector = scm_gc_malloc (size, "objcode-u8vector");
 246   memcpy (u8vector, SCM_OBJCODE_BASE (objcode), size);
 247
 248   return scm_take_u8vector (u8vector, size);
 249 }
 250 #undef FUNC_NAME
 251
 252 SCM_DEFINE (scm_objcode_to_program, "objcode->program", 1, 0, 0,
 253             (SCM objcode),
 254             "")
 255 #define FUNC_NAME s_scm_objcode_to_program
 256 {
 257   SCM prog;
 258   size_t size;
 259   char *base;
 260   struct scm_program *p;
 261
 262   SCM_VALIDATE_OBJCODE (1, objcode);
 263
 264   base = SCM_OBJCODE_BASE (objcode);
 265   size = SCM_OBJCODE_SIZE (objcode);
 266   prog = scm_c_make_program (base + 10, size - 10, objcode);
 267   p = SCM_PROGRAM_DATA (prog);
 268   p->nlocs = base[8];
 269   p->nexts = base[9];
 270   return prog;
 271 }
 272 #undef FUNC_NAME
 273
 274 \f
 275 void
 276 scm_init_objcodes (void)
 277 {
 278   scm_tc16_objcode = scm_make_smob_type ("objcode", 0);
 279   scm_set_smob_free (scm_tc16_objcode, objcode_free);
 280
 281 #ifndef SCM_MAGIC_SNARFER
 282 #include "objcodes.x"
 283 #endif
 284 }
 285
 286 /*
 287   Local Variables:
 288   c-file-style: "gnu"
 289   End:
 290 */