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   wind_data.this_frame = vp->this_frame;
  84   scm_dynwind_unwind_handler (vm_reset_stack, &wind_data, 0);
  85
  86   /* could do this if we reified all vm stacks -- for now, don't bother changing
  87      *the-vm*
  88   if (scm_fluid_ref (scm_the_vm_fluid) != vm)
  89     scm_dynwind_fluid (scm_the_vm_fluid, vm);
  90    */
  91
  92 #ifdef HAVE_LABELS_AS_VALUES
  93   /* Jump table */
  94   static void *jump_table[] = {
  95 #define VM_INSTRUCTION_TO_LABEL 1
  96 #include "vm-expand.h"
  97 #include "vm-i-system.i"
  98 #include "vm-i-scheme.i"
  99 #include "vm-i-loader.i"
 100 #undef VM_INSTRUCTION_TO_LABEL
 101   };
 102 #endif
 103
 104   /* Initialization */
 105   {
 106     SCM prog = program;
 107
 108     /* Boot program */
 109     scm_byte_t bytes[6] = {scm_op_mv_call, 0, 0, 1, scm_op_make_int8_1, scm_op_halt};
 110     bytes[1] = scm_ilength (args); /* FIXME: argument overflow */
 111     program = scm_c_make_program (bytes, 6, SCM_BOOL_F);
 112
 113     /* Initial frame */
 114     CACHE_REGISTER ();
 115     CACHE_PROGRAM ();
 116     PUSH (program);
 117     NEW_FRAME ();
 118
 119     /* Initial arguments */
 120     PUSH (prog);
 121     for (; !SCM_NULLP (args); args = SCM_CDR (args))
 122       PUSH (SCM_CAR (args));
 123   }
 124
 125   /* Let's go! */
 126   BOOT_HOOK ();
 127
 128 #ifndef HAVE_LABELS_AS_VALUES
 129  vm_start:
 130   switch (*ip++) {
 131 #endif
 132
 133 #include "vm-expand.h"
 134 #include "vm-i-system.c"
 135 #include "vm-i-scheme.c"
 136 #include "vm-i-loader.c"
 137
 138 #ifndef HAVE_LABELS_AS_VALUES
 139   }
 140 #endif
 141
 142   /* Errors */
 143   {
 144   vm_error_unbound:
 145     err_msg  = scm_from_locale_string ("VM: Unbound variable: ~A");
 146     goto vm_error;
 147
 148   vm_error_wrong_type_arg:
 149     err_msg  = scm_from_locale_string ("VM: Wrong type argument");
 150     err_args = SCM_EOL;
 151     goto vm_error;
 152
 153   vm_error_wrong_num_args:
 154     /* nargs and program are valid */
 155     SYNC_ALL ();
 156     if (objects)
 157       scm_array_handle_release (&objects_handle);
 158     scm_wrong_num_args (program);
 159     /* shouldn't get here */
 160     goto vm_error;
 161
 162   vm_error_wrong_type_apply:
 163     err_msg  = scm_from_locale_string ("VM: Wrong type to apply: ~S "
 164                                        "[IP offset: ~a]");
 165     err_args = SCM_LIST2 (program,
 166                           SCM_I_MAKINUM (ip - bp->base));
 167     goto vm_error;
 168
 169   vm_error_stack_overflow:
 170     err_msg  = scm_from_locale_string ("VM: Stack overflow");
 171     err_args = SCM_EOL;
 172     goto vm_error;
 173
 174   vm_error_stack_underflow:
 175     err_msg  = scm_from_locale_string ("VM: Stack underflow");
 176     err_args = SCM_EOL;
 177     goto vm_error;
 178
 179   vm_error_no_values:
 180     err_msg  = scm_from_locale_string ("VM: 0-valued return");
 181     err_args = SCM_EOL;
 182     goto vm_error;
 183
 184   vm_error_not_enough_values:
 185     err_msg  = scm_from_locale_string ("VM: Not enough values for mv-bind");
 186     err_args = SCM_EOL;
 187     goto vm_error;
 188
 189   vm_error_no_such_module:
 190     err_msg  = scm_from_locale_string ("VM: No such module: ~A");
 191     goto vm_error;
 192
 193 #if VM_CHECK_IP
 194   vm_error_invalid_address:
 195     err_msg  = scm_from_locale_string ("VM: Invalid program address");
 196     err_args = SCM_EOL;
 197     goto vm_error;
 198 #endif
 199
 200 #if VM_CHECK_EXTERNAL
 201   vm_error_external:
 202     err_msg  = scm_from_locale_string ("VM: Invalid external access");
 203     err_args = SCM_EOL;
 204     goto vm_error;
 205 #endif
 206
 207 #if VM_CHECK_OBJECT
 208   vm_error_object:
 209     err_msg = scm_from_locale_string ("VM: Invalid object table access");
 210     err_args = SCM_EOL;
 211     goto vm_error;
 212 #endif
 213
 214   vm_error:
 215     SYNC_ALL ();
 216     if (objects)
 217       scm_array_handle_release (&objects_handle);
 218
 219     scm_ithrow (sym_vm_error, SCM_LIST3 (sym_vm_run, err_msg, err_args), 1);
 220   }
 221
 222   abort (); /* never reached */
 223 }
 224 #undef FUNC_NAME
 225
 226 /*
 227   Local Variables:
 228   c-file-style: "gnu"
 229   End:
 230 */