libguile/vm-engine.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 /* This file is included in vm.c twice */
  43
  44 #include "vm-engine.h"
  45
  46
  47 static SCM
  48 vm_run (SCM vm, SCM program, SCM args)
  49 #define FUNC_NAME "vm-engine"
  50 {
  51   /* VM registers */
  52   register scm_byte_t *ip IP_REG;       /* instruction pointer */
  53   register SCM *sp SP_REG;              /* stack pointer */
  54   register SCM *fp FP_REG;              /* frame pointer */
  55
  56   /* Cache variables */
  57   struct scm_vm *vp = SCM_VM_DATA (vm); /* VM data pointer */
  58   struct scm_program *bp = NULL;        /* program base pointer */
  59   SCM external = SCM_EOL;               /* external environment */
  60   SCM *objects = NULL;                  /* constant objects */
  61   scm_t_array_handle objects_handle;    /* handle of the OBJECTS array */
  62   size_t object_count;                  /* length of OBJECTS */
  63   SCM *stack_base = vp->stack_base;     /* stack base address */
  64   SCM *stack_limit = vp->stack_limit;   /* stack limit address */
  65
  66   /* Internal variables */
  67   int nargs = 0;
  68   int nvalues = 0;
  69   long start_time = scm_c_get_internal_run_time ();
  70   // SCM dynwinds = SCM_EOL;
  71   SCM err_msg;
  72   SCM err_args;
  73 #if VM_USE_HOOKS
  74   SCM hook_args = SCM_LIST1 (vm);
  75 #endif
  76   struct vm_unwind_data wind_data;
  77
  78   /* dynwind ended in the halt instruction */
  79   scm_dynwind_begin (SCM_F_DYNWIND_REWINDABLE);
  80   wind_data.vp = vp;
  81   wind_data.sp = vp->sp;
  82   wind_data.fp = vp->fp;
  83   scm_dynwind_unwind_handler (vm_reset_stack, &wind_data, 0);
  84
  85   /* could do this if we reified all vm stacks -- for now, don't bother changing
  86      *the-vm*
  87   if (scm_fluid_ref (scm_the_vm_fluid) != vm)
  88     scm_dynwind_fluid (scm_the_vm_fluid, vm);
  89    */
  90
  91 #ifdef HAVE_LABELS_AS_VALUES
  92   /* Jump table */
  93   static void *jump_table[] = {
  94 #define VM_INSTRUCTION_TO_LABEL 1
  95 #include "vm-expand.h"
  96 #include "vm-i-system.i"
  97 #include "vm-i-scheme.i"
  98 #include "vm-i-loader.i"
  99 #undef VM_INSTRUCTION_TO_LABEL
 100   };
 101 #endif
 102
 103   /* Initialization */
 104   {
 105     SCM prog = program;
 106
 107     /* Boot program */
 108     scm_byte_t bytes[6] = {scm_op_mv_call, 0, 0, 1, scm_op_make_int8_1, scm_op_halt};
 109     bytes[1] = scm_ilength (args); /* FIXME: argument overflow */
 110     program = scm_c_make_program (bytes, 6, SCM_BOOL_F);
 111
 112     /* Initial frame */
 113     CACHE_REGISTER ();
 114     CACHE_PROGRAM ();
 115     PUSH (program);
 116     NEW_FRAME ();
 117
 118     /* Initial arguments */
 119     PUSH (prog);
 120     for (; !SCM_NULLP (args); args = SCM_CDR (args))
 121       PUSH (SCM_CAR (args));
 122   }
 123
 124   /* Let's go! */
 125   BOOT_HOOK ();
 126
 127 #ifndef HAVE_LABELS_AS_VALUES
 128  vm_start:
 129   switch (*ip++) {
 130 #endif
 131
 132 #include "vm-expand.h"
 133 #include "vm-i-system.c"
 134 #include "vm-i-scheme.c"
 135 #include "vm-i-loader.c"
 136
 137 #ifndef HAVE_LABELS_AS_VALUES
 138   }
 139 #endif
 140
 141   /* Errors */
 142   {
 143   vm_error_unbound:
 144     err_msg  = scm_from_locale_string ("VM: Unbound variable: ~A");
 145     goto vm_error;
 146
 147   vm_error_wrong_type_arg:
 148     err_msg  = scm_from_locale_string ("VM: Wrong type argument");
 149     err_args = SCM_EOL;
 150     goto vm_error;
 151
 152   vm_error_wrong_num_args:
 153     /* nargs and program are valid */
 154     SYNC_ALL ();
 155     if (objects)
 156       scm_array_handle_release (&objects_handle);
 157     scm_wrong_num_args (program);
 158     /* shouldn't get here */
 159     goto vm_error;
 160
 161   vm_error_wrong_type_apply:
 162     err_msg  = scm_from_locale_string ("VM: Wrong type to apply: ~S "
 163                                        "[IP offset: ~a]");
 164     err_args = SCM_LIST2 (program,
 165                           SCM_I_MAKINUM (ip - bp->base));
 166     goto vm_error;
 167
 168   vm_error_stack_overflow:
 169     err_msg  = scm_from_locale_string ("VM: Stack overflow");
 170     err_args = SCM_EOL;
 171     goto vm_error;
 172
 173   vm_error_stack_underflow:
 174     err_msg  = scm_from_locale_string ("VM: Stack underflow");
 175     err_args = SCM_EOL;
 176     goto vm_error;
 177
 178   vm_error_improper_list:
 179     err_msg  = scm_from_locale_string ("VM: Attempt to unroll an improper list: tail is ~A");
 180     goto vm_error;
 181
 182   vm_error_not_a_pair:
 183     SYNC_ALL ();
 184     scm_wrong_type_arg_msg (FUNC_NAME, 1, err_args, "pair");
 185     /* shouldn't get here */
 186     goto vm_error;
 187
 188   vm_error_no_values:
 189     err_msg  = scm_from_locale_string ("VM: 0-valued return");
 190     err_args = SCM_EOL;
 191     goto vm_error;
 192
 193   vm_error_not_enough_values:
 194     err_msg  = scm_from_locale_string ("VM: Not enough values for mv-bind");
 195     err_args = SCM_EOL;
 196     goto vm_error;
 197
 198   vm_error_no_such_module:
 199     err_msg  = scm_from_locale_string ("VM: No such module: ~A");
 200     goto vm_error;
 201
 202 #if VM_CHECK_IP
 203   vm_error_invalid_address:
 204     err_msg  = scm_from_locale_string ("VM: Invalid program address");
 205     err_args = SCM_EOL;
 206     goto vm_error;
 207 #endif
 208
 209 #if VM_CHECK_EXTERNAL
 210   vm_error_external:
 211     err_msg  = scm_from_locale_string ("VM: Invalid external access");
 212     err_args = SCM_EOL;
 213     goto vm_error;
 214 #endif
 215
 216 #if VM_CHECK_OBJECT
 217   vm_error_object:
 218     err_msg = scm_from_locale_string ("VM: Invalid object table access");
 219     err_args = SCM_EOL;
 220     goto vm_error;
 221 #endif
 222
 223   vm_error:
 224     SYNC_ALL ();
 225     if (objects)
 226       scm_array_handle_release (&objects_handle);
 227
 228     scm_ithrow (sym_vm_error, SCM_LIST3 (sym_vm_run, err_msg, err_args), 1);
 229   }
 230
 231   abort (); /* never reached */
 232 }
 233 #undef FUNC_NAME
 234
 235 /*
 236   Local Variables:
 237   c-file-style: "gnu"
 238   End:
 239 */