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 "modules.h"
  50 #include "programs.h"
  51 #include "vm.h"
  52
  53 \f
  54 scm_t_bits scm_tc16_program;
  55
  56 static SCM zero_vector;
  57
  58 SCM
  59 scm_c_make_program (void *addr, size_t size, SCM holder)
  60 #define FUNC_NAME "scm_c_make_program"
  61 {
  62   struct scm_program *p = scm_gc_malloc (sizeof (struct scm_program),
  63                                          "program");
  64   p->size     = size;
  65   p->nargs    = 0;
  66   p->nrest    = 0;
  67   p->nlocs    = 0;
  68   p->nexts    = 0;
  69   p->meta     = SCM_BOOL_F;
  70   p->objs     = zero_vector;
  71   p->external = SCM_EOL;
  72   p->holder   = holder;
  73   p->module   = scm_current_module ();
  74
  75   /* If nobody holds bytecode's address, then allocate a new memory */
  76   if (SCM_FALSEP (holder))
  77     {
  78       p->base = scm_gc_malloc (size, "program-base");
  79       memcpy (p->base, addr, size);
  80     }
  81   else
  82     p->base = addr;
  83
  84   SCM_RETURN_NEWSMOB (scm_tc16_program, p);
  85 }
  86 #undef FUNC_NAME
  87
  88 SCM
  89 scm_c_make_closure (SCM program, SCM external)
  90 {
  91   SCM prog = scm_c_make_program (0, 0, program);
  92   *SCM_PROGRAM_DATA (prog) = *SCM_PROGRAM_DATA (program);
  93   SCM_PROGRAM_DATA (prog)->external = external;
  94   return prog;
  95 }
  96
  97 static SCM
  98 program_mark (SCM obj)
  99 {
 100   struct scm_program *p = SCM_PROGRAM_DATA (obj);
 101   scm_gc_mark (p->meta);
 102   scm_gc_mark (p->objs);
 103   scm_gc_mark (p->external);
 104   scm_gc_mark (p->module);
 105   return p->holder;
 106 }
 107
 108 static scm_sizet
 109 program_free (SCM obj)
 110 {
 111   struct scm_program *p = SCM_PROGRAM_DATA (obj);
 112   scm_sizet size = (sizeof (struct scm_program));
 113
 114   if (SCM_FALSEP (p->holder))
 115     scm_gc_free (p->base, p->size, "program-base");
 116
 117   scm_gc_free (p, size, "program");
 118
 119   return 0;
 120 }
 121
 122 static SCM
 123 program_apply (SCM program, SCM args)
 124 {
 125   return scm_vm_apply (scm_the_vm (), program, args);
 126 }
 127
 128 \f
 129 /*
 130  * Scheme interface
 131  */
 132
 133 SCM_DEFINE (scm_program_p, "program?", 1, 0, 0,
 134             (SCM obj),
 135             "")
 136 #define FUNC_NAME s_scm_program_p
 137 {
 138   return SCM_BOOL (SCM_PROGRAM_P (obj));
 139 }
 140 #undef FUNC_NAME
 141
 142 SCM_DEFINE (scm_program_base, "program-base", 1, 0, 0,
 143             (SCM program),
 144             "")
 145 #define FUNC_NAME s_scm_program_base
 146 {
 147   SCM_VALIDATE_PROGRAM (1, program);
 148
 149   return scm_from_ulong ((unsigned long) SCM_PROGRAM_DATA (program)->base);
 150 }
 151 #undef FUNC_NAME
 152
 153 SCM_DEFINE (scm_program_arity, "program-arity", 1, 0, 0,
 154             (SCM program),
 155             "")
 156 #define FUNC_NAME s_scm_program_arity
 157 {
 158   struct scm_program *p;
 159
 160   SCM_VALIDATE_PROGRAM (1, program);
 161
 162   p = SCM_PROGRAM_DATA (program);
 163   return SCM_LIST4 (SCM_I_MAKINUM (p->nargs),
 164                     SCM_I_MAKINUM (p->nrest),
 165                     SCM_I_MAKINUM (p->nlocs),
 166                     SCM_I_MAKINUM (p->nexts));
 167 }
 168 #undef FUNC_NAME
 169
 170 SCM_DEFINE (scm_program_meta, "program-meta", 1, 0, 0,
 171             (SCM program),
 172             "")
 173 #define FUNC_NAME s_scm_program_meta
 174 {
 175   SCM_VALIDATE_PROGRAM (1, program);
 176   return SCM_PROGRAM_DATA (program)->meta;
 177 }
 178 #undef FUNC_NAME
 179
 180 SCM_DEFINE (scm_program_objects, "program-objects", 1, 0, 0,
 181             (SCM program),
 182             "")
 183 #define FUNC_NAME s_scm_program_objects
 184 {
 185   SCM_VALIDATE_PROGRAM (1, program);
 186   return SCM_PROGRAM_DATA (program)->objs;
 187 }
 188 #undef FUNC_NAME
 189
 190 SCM_DEFINE (scm_program_module, "program-module", 1, 0, 0,
 191             (SCM program),
 192             "")
 193 #define FUNC_NAME s_scm_program_module
 194 {
 195   SCM_VALIDATE_PROGRAM (1, program);
 196   return SCM_PROGRAM_DATA (program)->module;
 197 }
 198 #undef FUNC_NAME
 199
 200 SCM_DEFINE (scm_program_external, "program-external", 1, 0, 0,
 201             (SCM program),
 202             "")
 203 #define FUNC_NAME s_scm_program_external
 204 {
 205   SCM_VALIDATE_PROGRAM (1, program);
 206   return SCM_PROGRAM_DATA (program)->external;
 207 }
 208 #undef FUNC_NAME
 209
 210 SCM_DEFINE (scm_program_external_set_x, "program-external-set!", 2, 0, 0,
 211             (SCM program, SCM external),
 212             "Modify the list of closure variables of @var{program} (for "
 213             "debugging purposes).")
 214 #define FUNC_NAME s_scm_program_external_set_x
 215 {
 216   SCM_VALIDATE_PROGRAM (1, program);
 217   SCM_VALIDATE_LIST (2, external);
 218   SCM_PROGRAM_DATA (program)->external = external;
 219   return SCM_UNSPECIFIED;
 220 }
 221 #undef FUNC_NAME
 222
 223 SCM_DEFINE (scm_program_bytecode, "program-bytecode", 1, 0, 0,
 224             (SCM program),
 225             "Return a u8vector containing @var{program}'s bytecode.")
 226 #define FUNC_NAME s_scm_program_bytecode
 227 {
 228   size_t size;
 229   scm_t_uint8 *c_bytecode;
 230
 231   SCM_VALIDATE_PROGRAM (1, program);
 232
 233   size = SCM_PROGRAM_DATA (program)->size;
 234   c_bytecode = malloc (size);
 235   if (!c_bytecode)
 236     return SCM_BOOL_F;
 237
 238   memcpy (c_bytecode, SCM_PROGRAM_DATA (program)->base, size);
 239
 240   return scm_take_u8vector (c_bytecode, size);
 241 }
 242 #undef FUNC_NAME
 243
 244
 245 \f
 246 void
 247 scm_bootstrap_programs (void)
 248 {
 249   zero_vector = scm_permanent_object (scm_c_make_vector (0, SCM_BOOL_F));
 250
 251   scm_tc16_program = scm_make_smob_type ("program", 0);
 252   scm_set_smob_mark (scm_tc16_program, program_mark);
 253   scm_set_smob_free (scm_tc16_program, program_free);
 254   scm_set_smob_apply (scm_tc16_program, program_apply, 0, 0, 1);
 255 }
 256
 257 void
 258 scm_init_programs (void)
 259 {
 260   scm_bootstrap_vm ();
 261
 262 #ifndef SCM_MAGIC_SNARFER
 263 #include "programs.x"
 264 #endif
 265 }
 266
 267 /*
 268   Local Variables:
 269   c-file-style: "gnu"
 270   End:
 271 */