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