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