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_MUST_MALLOC (sizeof (struct scm_program));
  57   p->size     = size;
  58   p->nargs    = 0;
  59   p->nrest    = 0;
  60   p->nlocs    = 0;
  61   p->nexts    = 0;
  62   p->meta     = SCM_BOOL_F;
  63   p->objs     = zero_vector;
  64   p->external = SCM_EOL;
  65   p->holder   = holder;
  66
  67   /* If nobody holds bytecode's address, then allocate a new memory */
  68   if (SCM_FALSEP (holder))
  69     p->base = SCM_MUST_MALLOC (size);
  70   else
  71     p->base = addr;
  72
  73   SCM_RETURN_NEWSMOB (scm_tc16_program, p);
  74 }
  75 #undef FUNC_NAME
  76
  77 SCM
  78 scm_c_make_closure (SCM program, SCM external)
  79 {
  80   SCM prog = scm_c_make_program (0, 0, program);
  81   *SCM_PROGRAM_DATA (prog) = *SCM_PROGRAM_DATA (program);
  82   SCM_PROGRAM_DATA (prog)->external = external;
  83   return prog;
  84 }
  85
  86 static SCM
  87 program_mark (SCM obj)
  88 {
  89   struct scm_program *p = SCM_PROGRAM_DATA (obj);
  90   scm_gc_mark (p->meta);
  91   scm_gc_mark (p->objs);
  92   scm_gc_mark (p->external);
  93   return p->holder;
  94 }
  95
  96 static scm_sizet
  97 program_free (SCM obj)
  98 {
  99   struct scm_program *p = SCM_PROGRAM_DATA (obj);
 100   scm_sizet size = (sizeof (struct scm_program));
 101   if (SCM_FALSEP (p->holder))
 102     {
 103       size += p->size;
 104       scm_must_free (p->base);
 105     }
 106   scm_must_free (p);
 107   return size;
 108 }
 109
 110 static SCM
 111 program_apply (SCM program, SCM args)
 112 {
 113   return scm_vm_apply (scm_the_vm (), program, args);
 114 }
 115
 116 \f
 117 /*
 118  * Scheme interface
 119  */
 120
 121 SCM_DEFINE (scm_program_p, "program?", 1, 0, 0,
 122             (SCM obj),
 123             "")
 124 #define FUNC_NAME s_scm_program_p
 125 {
 126   return SCM_BOOL (SCM_PROGRAM_P (obj));
 127 }
 128 #undef FUNC_NAME
 129
 130 SCM_DEFINE (scm_program_base, "program-base", 1, 0, 0,
 131             (SCM program),
 132             "")
 133 #define FUNC_NAME s_scm_program_base
 134 {
 135   SCM_VALIDATE_PROGRAM (1, program);
 136
 137   return scm_ulong2num ((unsigned long) SCM_PROGRAM_DATA (program)->base);
 138 }
 139 #undef FUNC_NAME
 140
 141 SCM_DEFINE (scm_program_arity, "program-arity", 1, 0, 0,
 142             (SCM program),
 143             "")
 144 #define FUNC_NAME s_scm_program_arity
 145 {
 146   struct scm_program *p;
 147
 148   SCM_VALIDATE_PROGRAM (1, program);
 149
 150   p = SCM_PROGRAM_DATA (program);
 151   return SCM_LIST4 (SCM_MAKINUM (p->nargs),
 152                     SCM_MAKINUM (p->nrest),
 153                     SCM_MAKINUM (p->nlocs),
 154                     SCM_MAKINUM (p->nexts));
 155 }
 156 #undef FUNC_NAME
 157
 158 SCM_DEFINE (scm_program_meta, "program-meta", 1, 0, 0,
 159             (SCM program),
 160             "")
 161 #define FUNC_NAME s_scm_program_meta
 162 {
 163   SCM_VALIDATE_PROGRAM (1, program);
 164   return SCM_PROGRAM_DATA (program)->meta;
 165 }
 166 #undef FUNC_NAME
 167
 168 SCM_DEFINE (scm_program_objects, "program-objects", 1, 0, 0,
 169             (SCM program),
 170             "")
 171 #define FUNC_NAME s_scm_program_objects
 172 {
 173   SCM_VALIDATE_PROGRAM (1, program);
 174   return SCM_PROGRAM_DATA (program)->objs;
 175 }
 176 #undef FUNC_NAME
 177
 178 SCM_DEFINE (scm_program_external, "program-external", 1, 0, 0,
 179             (SCM program),
 180             "")
 181 #define FUNC_NAME s_scm_program_external
 182 {
 183   SCM_VALIDATE_PROGRAM (1, program);
 184   return SCM_PROGRAM_DATA (program)->external;
 185 }
 186 #undef FUNC_NAME
 187
 188 SCM_DEFINE (scm_program_bytecode, "program-bytecode", 1, 0, 0,
 189             (SCM program),
 190             "")
 191 #define FUNC_NAME s_scm_program_bytecode
 192 {
 193   SCM_VALIDATE_PROGRAM (1, program);
 194   return scm_makfromstr (SCM_PROGRAM_DATA (program)->base,
 195                          SCM_PROGRAM_DATA (program)->size, 0);
 196 }
 197 #undef FUNC_NAME
 198
 199 \f
 200 void
 201 scm_init_programs (void)
 202 {
 203   zero_vector = scm_permanent_object (scm_c_make_vector (0, SCM_BOOL_F));
 204
 205   scm_tc16_program = scm_make_smob_type ("program", 0);
 206   scm_set_smob_mark (scm_tc16_program, program_mark);
 207   scm_set_smob_free (scm_tc16_program, program_free);
 208   scm_set_smob_apply (scm_tc16_program, program_apply, 0, 0, 1);
 209
 210 #ifndef SCM_MAGIC_SNARFER
 211 #include "programs.x"
 212 #endif
 213 }
 214
 215 /*
 216   Local Variables:
 217   c-file-style: "gnu"
 218   End:
 219 */