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) SCM_SYSERROR;
  86
  87   addr = mmap (0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
  88   if (addr == MAP_FAILED) SCM_SYSERROR;
  89
  90   p = scm_gc_malloc (sizeof (struct scm_objcode), "objcode");
  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 {
 102   size_t size = sizeof (struct scm_objcode);
 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
 114     scm_gc_free (p->base, p->size, "objcode-base");
 115
 116   scm_gc_free (p, size, "objcode");
 117
 118   return 0;
 119 }
 120 #undef FUNC_NAME
 121
 122 \f
 123 /*
 124  * Scheme interface
 125  */
 126
 127 SCM_DEFINE (scm_objcode_p, "objcode?", 1, 0, 0,
 128             (SCM obj),
 129             "")
 130 #define FUNC_NAME s_scm_objcode_p
 131 {
 132   return SCM_BOOL (SCM_OBJCODE_P (obj));
 133 }
 134 #undef FUNC_NAME
 135
 136 SCM_DEFINE (scm_bytecode_to_objcode, "bytecode->objcode", 3, 0, 0,
 137             (SCM bytecode, SCM nlocs, SCM nexts),
 138             "")
 139 #define FUNC_NAME s_scm_bytecode_to_objcode
 140 {
 141   size_t size;
 142   ssize_t increment;
 143   scm_t_array_handle handle;
 144   char *base;
 145   const char *c_bytecode;
 146   SCM objcode;
 147
 148   if (scm_u8vector_p (bytecode) != SCM_BOOL_T)
 149     scm_wrong_type_arg (FUNC_NAME, 1, bytecode);
 150   SCM_VALIDATE_INUM (2, nlocs);
 151   SCM_VALIDATE_INUM (3, nexts);
 152
 153   c_bytecode = scm_u8vector_elements (bytecode, &handle, &size, &increment);
 154   assert (increment == 1);
 155
 156   objcode = make_objcode (size);
 157   base = SCM_OBJCODE_BASE (objcode);
 158
 159   memcpy (base, OBJCODE_COOKIE, 8);
 160   base[8] = scm_to_int (nlocs);
 161   base[9] = scm_to_int (nexts);
 162
 163   memcpy (base + 10, c_bytecode, size - 10);
 164
 165   scm_array_handle_release (&handle);
 166
 167   return objcode;
 168 }
 169 #undef FUNC_NAME
 170
 171 SCM_DEFINE (scm_load_objcode, "load-objcode", 1, 0, 0,
 172             (SCM file),
 173             "")
 174 #define FUNC_NAME s_scm_load_objcode
 175 {
 176   int fd;
 177
 178   SCM_VALIDATE_STRING (1, file);
 179
 180   fd = open (SCM_STRING_CHARS (file), O_RDONLY);
 181   if (fd < 0) SCM_SYSERROR;
 182
 183   return make_objcode_by_mmap (fd);
 184 }
 185 #undef FUNC_NAME
 186
 187 SCM_DEFINE (scm_objcode_to_u8vector, "objcode->u8vector", 1, 0, 0,
 188             (SCM objcode),
 189             "")
 190 #define FUNC_NAME s_scm_objcode_to_u8vector
 191 {
 192   char *u8vector;
 193   size_t size;
 194
 195   SCM_VALIDATE_OBJCODE (1, objcode);
 196
 197   size = SCM_OBJCODE_SIZE (objcode);
 198   /* FIXME:  Is `gc_malloc' ok here? */
 199   u8vector = scm_gc_malloc (size, "objcode-u8vector");
 200   memcpy (u8vector, SCM_OBJCODE_BASE (objcode), size);
 201
 202   return scm_take_u8vector (u8vector, size);
 203 }
 204 #undef FUNC_NAME
 205
 206 SCM_DEFINE (scm_objcode_to_program, "objcode->program", 1, 0, 0,
 207             (SCM objcode),
 208             "")
 209 #define FUNC_NAME s_scm_objcode_to_program
 210 {
 211   SCM prog;
 212   size_t size;
 213   char *base;
 214   struct scm_program *p;
 215
 216   SCM_VALIDATE_OBJCODE (1, objcode);
 217
 218   base = SCM_OBJCODE_BASE (objcode);
 219   size = SCM_OBJCODE_SIZE (objcode);
 220   prog = scm_c_make_program (base + 10, size - 10, objcode);
 221   p = SCM_PROGRAM_DATA (prog);
 222   p->nlocs = base[8];
 223   p->nexts = base[9];
 224   return prog;
 225 }
 226 #undef FUNC_NAME
 227
 228 \f
 229 void
 230 scm_init_objcodes (void)
 231 {
 232   scm_tc16_objcode = scm_make_smob_type ("objcode", 0);
 233   scm_set_smob_free (scm_tc16_objcode, objcode_free);
 234
 235 #ifndef SCM_MAGIC_SNARFER
 236 #include "objcodes.x"
 237 #endif
 238 }
 239
 240 /*
 241   Local Variables:
 242   c-file-style: "gnu"
 243   End:
 244 */