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 static SCM write_program = SCM_BOOL_F;
  58
  59 SCM
  60 scm_c_make_program (void *addr, size_t size, SCM holder)
  61 #define FUNC_NAME "scm_c_make_program"
  62 {
  63   struct scm_program *p = scm_gc_malloc (sizeof (struct scm_program),
  64                                          "program");
  65   p->size     = size;
  66   p->nargs    = 0;
  67   p->nrest    = 0;
  68   p->nlocs    = 0;
  69   p->nexts    = 0;
  70   p->meta     = SCM_BOOL_F;
  71   p->objs     = zero_vector;
  72   p->external = SCM_EOL;
  73   p->holder   = holder;
  74   p->module   = scm_current_module ();
  75
  76   /* If nobody holds bytecode's address, then allocate a new memory */
  77   if (SCM_FALSEP (holder))
  78     {
  79       p->base = scm_gc_malloc (size, "program-base");
  80       memcpy (p->base, addr, size);
  81     }
  82   else
  83     p->base = addr;
  84
  85   SCM_RETURN_NEWSMOB (scm_tc16_program, p);
  86 }
  87 #undef FUNC_NAME
  88
  89 SCM
  90 scm_c_make_closure (SCM program, SCM external)
  91 {
  92   SCM prog = scm_c_make_program (0, 0, program);
  93   *SCM_PROGRAM_DATA (prog) = *SCM_PROGRAM_DATA (program);
  94   SCM_PROGRAM_DATA (prog)->external = external;
  95   return prog;
  96 }
  97
  98 static SCM
  99 program_mark (SCM obj)
 100 {
 101   struct scm_program *p = SCM_PROGRAM_DATA (obj);
 102   scm_gc_mark (p->meta);
 103   scm_gc_mark (p->objs);
 104   scm_gc_mark (p->external);
 105   scm_gc_mark (p->module);
 106   return p->holder;
 107 }
 108
 109 static scm_sizet
 110 program_free (SCM obj)
 111 {
 112   struct scm_program *p = SCM_PROGRAM_DATA (obj);
 113   scm_sizet size = (sizeof (struct scm_program));
 114
 115   if (SCM_FALSEP (p->holder))
 116     scm_gc_free (p->base, p->size, "program-base");
 117
 118   scm_gc_free (p, size, "program");
 119
 120   return 0;
 121 }
 122
 123 static SCM
 124 program_apply (SCM program, SCM args)
 125 {
 126   return scm_vm_apply (scm_the_vm (), program, args);
 127 }
 128
 129 static int
 130 program_print (SCM program, SCM port, scm_print_state *pstate)
 131 {
 132   static int print_error = 0;
 133
 134   if (SCM_FALSEP (write_program))
 135     write_program = scm_module_local_variable
 136       (scm_c_resolve_module ("system vm program"),
 137        scm_from_locale_symbol ("write-program"));
 138
 139   if (SCM_FALSEP (write_program) || print_error)
 140     return scm_smob_print (program, port, pstate);
 141
 142   print_error = 1;
 143   scm_call_2 (SCM_VARIABLE_REF (write_program), program, port);
 144   print_error = 0;
 145   return 1;
 146 }
 147
 148 \f
 149 /*
 150  * Scheme interface
 151  */
 152
 153 SCM_DEFINE (scm_program_p, "program?", 1, 0, 0,
 154             (SCM obj),
 155             "")
 156 #define FUNC_NAME s_scm_program_p
 157 {
 158   return SCM_BOOL (SCM_PROGRAM_P (obj));
 159 }
 160 #undef FUNC_NAME
 161
 162 SCM_DEFINE (scm_program_base, "program-base", 1, 0, 0,
 163             (SCM program),
 164             "")
 165 #define FUNC_NAME s_scm_program_base
 166 {
 167   SCM_VALIDATE_PROGRAM (1, program);
 168
 169   return scm_from_ulong ((unsigned long) SCM_PROGRAM_DATA (program)->base);
 170 }
 171 #undef FUNC_NAME
 172
 173 SCM_DEFINE (scm_program_arity, "program-arity", 1, 0, 0,
 174             (SCM program),
 175             "")
 176 #define FUNC_NAME s_scm_program_arity
 177 {
 178   struct scm_program *p;
 179
 180   SCM_VALIDATE_PROGRAM (1, program);
 181
 182   p = SCM_PROGRAM_DATA (program);
 183   return SCM_LIST4 (SCM_I_MAKINUM (p->nargs),
 184                     SCM_I_MAKINUM (p->nrest),
 185                     SCM_I_MAKINUM (p->nlocs),
 186                     SCM_I_MAKINUM (p->nexts));
 187 }
 188 #undef FUNC_NAME
 189
 190 SCM_DEFINE (scm_program_meta, "program-meta", 1, 0, 0,
 191             (SCM program),
 192             "")
 193 #define FUNC_NAME s_scm_program_meta
 194 {
 195   SCM_VALIDATE_PROGRAM (1, program);
 196   return SCM_PROGRAM_DATA (program)->meta;
 197 }
 198 #undef FUNC_NAME
 199
 200 SCM_DEFINE (scm_program_objects, "program-objects", 1, 0, 0,
 201             (SCM program),
 202             "")
 203 #define FUNC_NAME s_scm_program_objects
 204 {
 205   SCM_VALIDATE_PROGRAM (1, program);
 206   return SCM_PROGRAM_DATA (program)->objs;
 207 }
 208 #undef FUNC_NAME
 209
 210 SCM_DEFINE (scm_program_module, "program-module", 1, 0, 0,
 211             (SCM program),
 212             "")
 213 #define FUNC_NAME s_scm_program_module
 214 {
 215   SCM_VALIDATE_PROGRAM (1, program);
 216   return SCM_PROGRAM_DATA (program)->module;
 217 }
 218 #undef FUNC_NAME
 219
 220 SCM_DEFINE (scm_program_external, "program-external", 1, 0, 0,
 221             (SCM program),
 222             "")
 223 #define FUNC_NAME s_scm_program_external
 224 {
 225   SCM_VALIDATE_PROGRAM (1, program);
 226   return SCM_PROGRAM_DATA (program)->external;
 227 }
 228 #undef FUNC_NAME
 229
 230 SCM_DEFINE (scm_program_external_set_x, "program-external-set!", 2, 0, 0,
 231             (SCM program, SCM external),
 232             "Modify the list of closure variables of @var{program} (for "
 233             "debugging purposes).")
 234 #define FUNC_NAME s_scm_program_external_set_x
 235 {
 236   SCM_VALIDATE_PROGRAM (1, program);
 237   SCM_VALIDATE_LIST (2, external);
 238   SCM_PROGRAM_DATA (program)->external = external;
 239   return SCM_UNSPECIFIED;
 240 }
 241 #undef FUNC_NAME
 242
 243 SCM_DEFINE (scm_program_bytecode, "program-bytecode", 1, 0, 0,
 244             (SCM program),
 245             "Return a u8vector containing @var{program}'s bytecode.")
 246 #define FUNC_NAME s_scm_program_bytecode
 247 {
 248   size_t size;
 249   scm_t_uint8 *c_bytecode;
 250
 251   SCM_VALIDATE_PROGRAM (1, program);
 252
 253   size = SCM_PROGRAM_DATA (program)->size;
 254   c_bytecode = malloc (size);
 255   if (!c_bytecode)
 256     return SCM_BOOL_F;
 257
 258   memcpy (c_bytecode, SCM_PROGRAM_DATA (program)->base, size);
 259
 260   return scm_take_u8vector (c_bytecode, size);
 261 }
 262 #undef FUNC_NAME
 263
 264
 265 \f
 266 void
 267 scm_bootstrap_programs (void)
 268 {
 269   zero_vector = scm_permanent_object (scm_c_make_vector (0, SCM_BOOL_F));
 270
 271   scm_tc16_program = scm_make_smob_type ("program", 0);
 272   scm_set_smob_mark (scm_tc16_program, program_mark);
 273   scm_set_smob_free (scm_tc16_program, program_free);
 274   scm_set_smob_apply (scm_tc16_program, program_apply, 0, 0, 1);
 275   scm_set_smob_print (scm_tc16_program, program_print);
 276 }
 277
 278 void
 279 scm_init_programs (void)
 280 {
 281   scm_bootstrap_vm ();
 282
 283 #ifndef SCM_MAGIC_SNARFER
 284 #include "programs.x"
 285 #endif
 286 }
 287
 288 /*
 289   Local Variables:
 290   c-file-style: "gnu"
 291   End:
 292 */