src/vm_loader.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 /* This file is included in vm_engine.c */
  43
  44 VM_DEFINE_LOADER (load_integer, "load-integer")
  45 {
  46   size_t len;
  47
  48   FETCH_LENGTH (len);
  49   if (len <= 4)
  50     {
  51       long val = 0;
  52       while (len-- > 0)
  53         val = (val << 8) + FETCH ();
  54       PUSH (scm_long2num (val));
  55       NEXT;
  56     }
  57   else
  58     SCM_MISC_ERROR ("load-integer: not implemented yet", SCM_EOL);
  59 }
  60
  61 VM_DEFINE_LOADER (load_number, "load-number")
  62 {
  63   size_t len;
  64
  65   FETCH_LENGTH (len);
  66   PUSH (scm_string_to_number (scm_from_locale_stringn (ip, len),
  67                               SCM_UNSPECIFIED /* radix = 10 */));
  68   /* Was: scm_istring2number (ip, len, 10)); */
  69   ip += len;
  70   NEXT;
  71 }
  72
  73 VM_DEFINE_LOADER (load_string, "load-string")
  74 {
  75   size_t len;
  76   FETCH_LENGTH (len);
  77   PUSH (scm_from_locale_stringn (ip, len));
  78   /* Was: scm_makfromstr (ip, len, 0) */
  79   ip += len;
  80   NEXT;
  81 }
  82
  83 VM_DEFINE_LOADER (load_symbol, "load-symbol")
  84 {
  85   size_t len;
  86   FETCH_LENGTH (len);
  87   PUSH (scm_mem2symbol (ip, len));
  88   ip += len;
  89   NEXT;
  90 }
  91
  92 VM_DEFINE_LOADER (load_keyword, "load-keyword")
  93 {
  94   SCM sym;
  95   size_t len;
  96   FETCH_LENGTH (len);
  97   sym = scm_mem2symbol (ip, len);
  98   PUSH (scm_make_keyword_from_dash_symbol (sym));
  99   ip += len;
 100   NEXT;
 101 }
 102
 103 VM_DEFINE_LOADER (load_module, "load-module")
 104 {
 105   size_t len;
 106   FETCH_LENGTH (len);
 107   PUSH (scm_c_lookup_env (scm_mem2symbol (ip, len)));
 108   ip += len;
 109   NEXT;
 110 }
 111
 112 VM_DEFINE_LOADER (load_program, "load-program")
 113 {
 114   size_t len;
 115   SCM prog, x;
 116   struct scm_program *p;
 117
 118   FETCH_LENGTH (len);
 119   prog = scm_c_make_program (ip, len, program);
 120   p = SCM_PROGRAM_DATA (prog);
 121   ip += len;
 122
 123   POP (x);
 124
 125   /* init meta data */
 126   if (SCM_CONSP (x))
 127     {
 128       p->meta = x;
 129       POP (x);
 130     }
 131
 132   /* init object table */
 133   if (SCM_VECTORP (x))
 134     {
 135       p->objs = x;
 136       POP (x);
 137     }
 138
 139   /* init parameters */
 140   /* NOTE: format defined in system/vm/assemble.scm */
 141   if (scm_is_integer (x))
 142     {
 143       int i = scm_to_int (x);
 144       if (-128 <= i && i <= 127)
 145         {
 146           /* 8-bit representation */
 147           p->nargs = (i >> 6) & 0x03;   /* 7-6 bits */
 148           p->nrest = (i >> 5) & 0x01;   /*   5 bit  */
 149           p->nlocs = (i >> 2) & 0x07;   /* 4-2 bits */
 150           p->nexts = i & 0x03;          /* 1-0 bits */
 151         }
 152       else
 153         {
 154           /* 16-bit representation */
 155           p->nargs = (i >> 12) & 0x07;  /* 15-12 bits */
 156           p->nrest = (i >> 11) & 0x01;  /*    11 bit  */
 157           p->nlocs = (i >> 4)  & 0x7f;  /* 10-04 bits */
 158           p->nexts = i & 0x0f;          /* 03-00 bits */
 159         }
 160     }
 161   else
 162     {
 163       /* Other cases */
 164       sp -= 4;
 165       p->nargs = scm_to_int (sp[0]);
 166       p->nrest = scm_to_int (sp[1]);
 167       p->nlocs = scm_to_int (sp[2]);
 168       p->nexts = scm_to_int (sp[3]);
 169     }
 170
 171   PUSH (prog);
 172   NEXT;
 173 }
 174
 175 VM_DEFINE_LOADER (link, "link")
 176 {
 177   SCM sym;
 178   size_t len;
 179
 180   FETCH_LENGTH (len);
 181   sym = scm_mem2symbol (ip, len);
 182   ip += len;
 183
 184 #if 0
 185   *sp = scm_c_env_vcell (*sp, sym, 1);
 186 #endif
 187   {
 188     /* Temporary hack that supports the current module system */
 189     SCM mod = scm_current_module ();
 190     SCM var = scm_eval_closure_lookup (scm_standard_eval_closure (mod),
 191                                        sym, SCM_BOOL_F);
 192     if (SCM_FALSEP (var))
 193       /* Create a new variable if not defined yet */
 194       var = scm_eval_closure_lookup (scm_standard_eval_closure (mod),
 195                                      sym, SCM_BOOL_T);
 196     PUSH (scm_variable_ref (var));
 197     /* Was: SCM_VARVCELL (var)); */
 198     NEXT;
 199   }
 200 }
 201
 202 /*
 203   Local Variables:
 204   c-file-style: "gnu"
 205   End:
 206 */