libguile/programs.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 #if HAVE_CONFIG_H
  43 #  include <config.h>
  44 #endif
  45
  46 #include <string.h>
  47 #include "vm-bootstrap.h"
  48 #include "instructions.h"
  49 #include "programs.h"
  50 #include "vm.h"
  51
  52 \f
  53 scm_t_bits scm_tc16_program;
  54
  55 static SCM zero_vector;
  56
  57 SCM
  58 scm_c_make_program (void *addr, size_t size, SCM holder)
  59 #define FUNC_NAME "scm_c_make_program"
  60 {
  61   struct scm_program *p = scm_gc_malloc (sizeof (struct scm_program),
  62                                          "program");
  63   p->size     = size;
  64   p->nargs    = 0;
  65   p->nrest    = 0;
  66   p->nlocs    = 0;
  67   p->nexts    = 0;
  68   p->meta     = SCM_BOOL_F;
  69   p->objs     = zero_vector;
  70   p->external = SCM_EOL;
  71   p->holder   = holder;
  72
  73   /* If nobody holds bytecode's address, then allocate a new memory */
  74   if (SCM_FALSEP (holder))
  75     {
  76       p->base = scm_gc_malloc (size, "program-base");
  77       memcpy (p->base, addr, size);
  78     }
  79   else
  80     p->base = addr;
  81
  82   SCM_RETURN_NEWSMOB (scm_tc16_program, p);
  83 }
  84 #undef FUNC_NAME
  85
  86 SCM
  87 scm_c_make_closure (SCM program, SCM external)
  88 {
  89   SCM prog = scm_c_make_program (0, 0, program);
  90   *SCM_PROGRAM_DATA (prog) = *SCM_PROGRAM_DATA (program);
  91   SCM_PROGRAM_DATA (prog)->external = external;
  92   return prog;
  93 }
  94
  95 static SCM
  96 program_mark (SCM obj)
  97 {
  98   struct scm_program *p = SCM_PROGRAM_DATA (obj);
  99   scm_gc_mark (p->meta);
 100   scm_gc_mark (p->objs);
 101   scm_gc_mark (p->external);
 102   return p->holder;
 103 }
 104
 105 static scm_sizet
 106 program_free (SCM obj)
 107 {
 108   struct scm_program *p = SCM_PROGRAM_DATA (obj);
 109   scm_sizet size = (sizeof (struct scm_program));
 110
 111   if (SCM_FALSEP (p->holder))
 112     scm_gc_free (p->base, p->size, "program-base");
 113
 114   scm_gc_free (p, size, "program");
 115
 116   return 0;
 117 }
 118
 119 static SCM
 120 program_apply (SCM program, SCM args)
 121 {
 122   return scm_vm_apply (scm_the_vm (), program, args);
 123 }
 124
 125 \f
 126 /*
 127  * Scheme interface
 128  */
 129
 130 SCM_DEFINE (scm_program_p, "program?", 1, 0, 0,
 131             (SCM obj),
 132             "")
 133 #define FUNC_NAME s_scm_program_p
 134 {
 135   return SCM_BOOL (SCM_PROGRAM_P (obj));
 136 }
 137 #undef FUNC_NAME
 138
 139 SCM_DEFINE (scm_program_base, "program-base", 1, 0, 0,
 140             (SCM program),
 141             "")
 142 #define FUNC_NAME s_scm_program_base
 143 {
 144   SCM_VALIDATE_PROGRAM (1, program);
 145
 146   return scm_from_ulong ((unsigned long) SCM_PROGRAM_DATA (program)->base);
 147 }
 148 #undef FUNC_NAME
 149
 150 SCM_DEFINE (scm_program_arity, "program-arity", 1, 0, 0,
 151             (SCM program),
 152             "")
 153 #define FUNC_NAME s_scm_program_arity
 154 {
 155   struct scm_program *p;
 156
 157   SCM_VALIDATE_PROGRAM (1, program);
 158
 159   p = SCM_PROGRAM_DATA (program);
 160   return SCM_LIST4 (SCM_I_MAKINUM (p->nargs),
 161                     SCM_I_MAKINUM (p->nrest),
 162                     SCM_I_MAKINUM (p->nlocs),
 163                     SCM_I_MAKINUM (p->nexts));
 164 }
 165 #undef FUNC_NAME
 166
 167 SCM_DEFINE (scm_program_meta, "program-meta", 1, 0, 0,
 168             (SCM program),
 169             "")
 170 #define FUNC_NAME s_scm_program_meta
 171 {
 172   SCM_VALIDATE_PROGRAM (1, program);
 173   return SCM_PROGRAM_DATA (program)->meta;
 174 }
 175 #undef FUNC_NAME
 176
 177 SCM_DEFINE (scm_program_objects, "program-objects", 1, 0, 0,
 178             (SCM program),
 179             "")
 180 #define FUNC_NAME s_scm_program_objects
 181 {
 182   SCM_VALIDATE_PROGRAM (1, program);
 183   return SCM_PROGRAM_DATA (program)->objs;
 184 }
 185 #undef FUNC_NAME
 186
 187 SCM_DEFINE (scm_program_external, "program-external", 1, 0, 0,
 188             (SCM program),
 189             "")
 190 #define FUNC_NAME s_scm_program_external
 191 {
 192   SCM_VALIDATE_PROGRAM (1, program);
 193   return SCM_PROGRAM_DATA (program)->external;
 194 }
 195 #undef FUNC_NAME
 196
 197 SCM_DEFINE (scm_program_external_set_x, "program-external-set!", 2, 0, 0,
 198             (SCM program, SCM external),
 199             "Modify the list of closure variables of @var{program} (for "
 200             "debugging purposes).")
 201 #define FUNC_NAME s_scm_program_external_set_x
 202 {
 203   SCM_VALIDATE_PROGRAM (1, program);
 204   SCM_VALIDATE_LIST (2, external);
 205   SCM_PROGRAM_DATA (program)->external = external;
 206   return SCM_UNSPECIFIED;
 207 }
 208 #undef FUNC_NAME
 209
 210 SCM_DEFINE (scm_program_bytecode, "program-bytecode", 1, 0, 0,
 211             (SCM program),
 212             "Return a u8vector containing @var{program}'s bytecode.")
 213 #define FUNC_NAME s_scm_program_bytecode
 214 {
 215   size_t size;
 216   scm_t_uint8 *c_bytecode;
 217
 218   SCM_VALIDATE_PROGRAM (1, program);
 219
 220   size = SCM_PROGRAM_DATA (program)->size;
 221   c_bytecode = malloc (size);
 222   if (!c_bytecode)
 223     return SCM_BOOL_F;
 224
 225   memcpy (c_bytecode, SCM_PROGRAM_DATA (program)->base, size);
 226
 227   return scm_take_u8vector (c_bytecode, size);
 228 }
 229 #undef FUNC_NAME
 230
 231
 232 \f
 233 void
 234 scm_bootstrap_programs (void)
 235 {
 236   zero_vector = scm_permanent_object (scm_c_make_vector (0, SCM_BOOL_F));
 237
 238   scm_tc16_program = scm_make_smob_type ("program", 0);
 239   scm_set_smob_mark (scm_tc16_program, program_mark);
 240   scm_set_smob_free (scm_tc16_program, program_free);
 241   scm_set_smob_apply (scm_tc16_program, program_apply, 0, 0, 1);
 242 }
 243
 244 void
 245 scm_init_programs (void)
 246 {
 247   scm_bootstrap_vm ();
 248
 249 #ifndef SCM_MAGIC_SNARFER
 250 #include "programs.x"
 251 #endif
 252 }
 253
 254 /*
 255   Local Variables:
 256   c-file-style: "gnu"
 257   End:
 258 */