summaryrefslogtreecommitdiff
path: root/libguile/vm-engine.c
blob: 45251fd70145f9ba8edc9c5904e480fc4d17962e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
/* Copyright (C) 2001 Free Software Foundation, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for GUILE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.  */

/* This file is included in vm.c multiple times */

#if (VM_ENGINE == SCM_VM_REGULAR_ENGINE)
#define VM_USE_HOOKS		0	/* Various hooks */
#define VM_USE_CLOCK		0	/* Bogoclock */
#define VM_CHECK_EXTERNAL	1	/* Check external link */
#define VM_CHECK_OBJECT         1       /* Check object table */
#define VM_PUSH_DEBUG_FRAMES    0       /* Push frames onto the evaluator debug stack */
#elif (VM_ENGINE == SCM_VM_DEBUG_ENGINE)
#define VM_USE_HOOKS		1
#define VM_USE_CLOCK		1
#define VM_CHECK_EXTERNAL	1
#define VM_CHECK_OBJECT         1
#define VM_PUSH_DEBUG_FRAMES    1
#else
#error unknown debug engine VM_ENGINE
#endif

#include "vm-engine.h"


static SCM
VM_NAME (struct scm_vm *vp, SCM program, SCM *argv, int nargs)
{
  /* VM registers */
  register scm_byte_t *ip IP_REG;	/* instruction pointer */
  register SCM *sp SP_REG;		/* stack pointer */
  register SCM *fp FP_REG;		/* frame pointer */

  /* Cache variables */
  struct scm_objcode *bp = NULL;	/* program base pointer */
  SCM external = SCM_EOL;		/* external environment */
  SCM *objects = NULL;			/* constant objects */
  size_t object_count = 0;              /* length of OBJECTS */
  SCM *stack_base = vp->stack_base;	/* stack base address */
  SCM *stack_limit = vp->stack_limit;	/* stack limit address */

  /* Internal variables */
  int nvalues = 0;
  long start_time = scm_c_get_internal_run_time ();
  SCM finish_args;                      /* used both for returns: both in error
                                           and normal situations */
#if VM_USE_HOOKS
  SCM hook_args = SCM_EOL;
#endif

#ifdef HAVE_LABELS_AS_VALUES
  static void **jump_table = NULL;
#endif
  
#if VM_PUSH_DEBUG_FRAMES
  scm_t_debug_frame debug;
  scm_t_debug_info debug_vect_body;
  debug.status = SCM_VOIDFRAME;
#endif

#ifdef HAVE_LABELS_AS_VALUES
  if (SCM_UNLIKELY (!jump_table))
    {
      int i;
      jump_table = malloc (SCM_VM_NUM_INSTRUCTIONS * sizeof(void*));
      for (i = 0; i < SCM_VM_NUM_INSTRUCTIONS; i++)
        jump_table[i] = &&vm_error_bad_instruction;
#define VM_INSTRUCTION_TO_LABEL 1
#include <libguile/vm-expand.h>
#include <libguile/vm-i-system.i>
#include <libguile/vm-i-scheme.i>
#include <libguile/vm-i-loader.i>
#undef VM_INSTRUCTION_TO_LABEL
    }
#endif

  /* Initialization */
  {
    SCM prog = program;

    /* Boot program */
    program = vm_make_boot_program (nargs);

#if VM_PUSH_DEBUG_FRAMES
    debug.prev = scm_i_last_debug_frame ();
    debug.status = SCM_APPLYFRAME;
    debug.vect = &debug_vect_body;
    debug.vect[0].a.proc = program; /* the boot program */
    debug.vect[0].a.args = SCM_EOL;
    scm_i_set_last_debug_frame (&debug);
#endif

    /* Initial frame */
    CACHE_REGISTER ();
    CACHE_PROGRAM ();
    PUSH (program);
    NEW_FRAME ();

    /* Initial arguments */
    PUSH (prog);
    if (SCM_UNLIKELY (sp + nargs >= stack_limit))
      goto vm_error_too_many_args;
    while (nargs--)
      PUSH (*argv++);
  }

  /* Let's go! */
  BOOT_HOOK ();
  NEXT;

#ifndef HAVE_LABELS_AS_VALUES
 vm_start:
  switch ((*ip++) & SCM_VM_INSTRUCTION_MASK) {
#endif

#include "vm-expand.h"
#include "vm-i-system.c"
#include "vm-i-scheme.c"
#include "vm-i-loader.c"

#ifndef HAVE_LABELS_AS_VALUES
  default:
    goto vm_error_bad_instruction;
  }
#endif

  
 vm_done:
  SYNC_ALL ();
#if VM_PUSH_DEBUG_FRAMES
  scm_i_set_last_debug_frame (debug.prev);
#endif
  return finish_args;

  /* Errors */
  {
    SCM err_msg;

  vm_error_bad_instruction:
    err_msg  = scm_from_locale_string ("VM: Bad instruction: ~A");
    finish_args = scm_list_1 (scm_from_uchar (ip[-1]));
    goto vm_error;

  vm_error_unbound:
    err_msg  = scm_from_locale_string ("VM: Unbound variable: ~A");
    goto vm_error;

  vm_error_wrong_type_arg:
    err_msg  = scm_from_locale_string ("VM: Wrong type argument");
    finish_args = SCM_EOL;
    goto vm_error;

  vm_error_too_many_args:
    err_msg  = scm_from_locale_string ("VM: Too many arguments");
    finish_args = scm_list_1 (scm_from_int (nargs));
    goto vm_error;

  vm_error_wrong_num_args:
    /* nargs and program are valid */
    SYNC_ALL ();
    scm_wrong_num_args (program);
    /* shouldn't get here */
    goto vm_error;

  vm_error_wrong_type_apply:
    err_msg  = scm_from_locale_string ("VM: Wrong type to apply: ~S "
				       "[IP offset: ~a]");
    finish_args = scm_list_2 (program,
			      SCM_I_MAKINUM (ip - bp->base));
    goto vm_error;

  vm_error_stack_overflow:
    err_msg  = scm_from_locale_string ("VM: Stack overflow");
    finish_args = SCM_EOL;
    goto vm_error;

  vm_error_stack_underflow:
    err_msg  = scm_from_locale_string ("VM: Stack underflow");
    finish_args = SCM_EOL;
    goto vm_error;

  vm_error_improper_list:
    err_msg  = scm_from_locale_string ("VM: Attempt to unroll an improper list: tail is ~A");
    goto vm_error;

  vm_error_not_a_pair:
    SYNC_ALL ();
    scm_wrong_type_arg_msg (FUNC_NAME, 1, finish_args, "pair");
    /* shouldn't get here */
    goto vm_error;

  vm_error_no_values:
    err_msg  = scm_from_locale_string ("VM: 0-valued return");
    finish_args = SCM_EOL;
    goto vm_error;

  vm_error_not_enough_values:
    err_msg  = scm_from_locale_string ("VM: Not enough values for mv-bind");
    finish_args = SCM_EOL;
    goto vm_error;

  vm_error_no_such_module:
    err_msg  = scm_from_locale_string ("VM: No such module: ~A");
    goto vm_error;

#if VM_CHECK_IP
  vm_error_invalid_address:
    err_msg  = scm_from_locale_string ("VM: Invalid program address");
    finish_args = SCM_EOL;
    goto vm_error;
#endif

#if VM_CHECK_EXTERNAL
  vm_error_external:
    err_msg  = scm_from_locale_string ("VM: Invalid external access");
    finish_args = SCM_EOL;
    goto vm_error;
#endif

#if VM_CHECK_OBJECT
  vm_error_object:
    err_msg = scm_from_locale_string ("VM: Invalid object table access");
    finish_args = SCM_EOL;
    goto vm_error;
#endif

  vm_error:
    SYNC_ALL ();

    scm_ithrow (sym_vm_error, scm_list_3 (sym_vm_run, err_msg, finish_args),
		1);
  }

  abort (); /* never reached */
}

#undef VM_USE_HOOKS
#undef VM_USE_CLOCK
#undef VM_CHECK_EXTERNAL
#undef VM_CHECK_OBJECT
#undef VM_PUSH_DEBUG_FRAMES

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/