File: error.c

package info (click to toggle)
mruby 2.0.0-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 3,576 kB
  • sloc: ansic: 37,355; ruby: 18,305; yacc: 6,107; sh: 20; makefile: 12
file content (514 lines) | stat: -rw-r--r-- 12,863 bytes parent folder | download | duplicates (3)
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
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
/*
** error.c - Exception class
**
** See Copyright Notice in mruby.h
*/

#include <errno.h>
#include <stdarg.h>
#include <stdlib.h>
#include <mruby.h>
#include <mruby/array.h>
#include <mruby/irep.h>
#include <mruby/proc.h>
#include <mruby/string.h>
#include <mruby/variable.h>
#include <mruby/debug.h>
#include <mruby/error.h>
#include <mruby/class.h>
#include <mruby/throw.h>

MRB_API mrb_value
mrb_exc_new(mrb_state *mrb, struct RClass *c, const char *ptr, size_t len)
{
  mrb_value arg = mrb_str_new(mrb, ptr, len);
  return mrb_obj_new(mrb, c, 1, &arg);
}

MRB_API mrb_value
mrb_exc_new_str(mrb_state *mrb, struct RClass* c, mrb_value str)
{
  mrb_to_str(mrb, str);
  return mrb_obj_new(mrb, c, 1, &str);
}

/*
 * call-seq:
 *    Exception.new(msg = nil)   ->  exception
 *
 *  Construct a new Exception object, optionally passing in
 *  a message.
 */

static mrb_value
exc_initialize(mrb_state *mrb, mrb_value exc)
{
  mrb_value mesg;
  mrb_int argc;
  mrb_value *argv;

  if (mrb_get_args(mrb, "|o*!", &mesg, &argv, &argc) >= 1) {
    mrb_iv_set(mrb, exc, mrb_intern_lit(mrb, "mesg"), mesg);
  }
  return exc;
}

/*
 *  Document-method: exception
 *
 *  call-seq:
 *     exc.exception(string)  ->  an_exception or exc
 *
 *  With no argument, or if the argument is the same as the receiver,
 *  return the receiver. Otherwise, create a new
 *  exception object of the same class as the receiver, but with a
 *  message equal to <code>string</code>.
 *
 */

static mrb_value
exc_exception(mrb_state *mrb, mrb_value self)
{
  mrb_value exc;
  mrb_value a;
  mrb_int argc;

  argc = mrb_get_args(mrb, "|o", &a);
  if (argc == 0) return self;
  if (mrb_obj_equal(mrb, self, a)) return self;
  exc = mrb_obj_clone(mrb, self);
  mrb_iv_set(mrb, exc, mrb_intern_lit(mrb, "mesg"), a);

  return exc;
}

/*
 * call-seq:
 *   exception.to_s   ->  string
 *
 * Returns exception's message (or the name of the exception if
 * no message is set).
 */

static mrb_value
exc_to_s(mrb_state *mrb, mrb_value exc)
{
  mrb_value mesg = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "mesg"));
  struct RObject *p;

  if (!mrb_string_p(mesg)) {
    return mrb_str_new_cstr(mrb, mrb_obj_classname(mrb, exc));
  }
  p = mrb_obj_ptr(mesg);
  if (!p->c) {
    p->c = mrb->string_class;
  }
  return mesg;
}

/*
 * call-seq:
 *   exception.message   ->  string
 *
 * Returns the result of invoking <code>exception.to_s</code>.
 * Normally this returns the exception's message or name.
 */

static mrb_value
exc_message(mrb_state *mrb, mrb_value exc)
{
  return mrb_funcall(mrb, exc, "to_s", 0);
}

/*
 * call-seq:
 *   exception.inspect   -> string
 *
 * Returns this exception's file name, line number,
 * message and class name.
 * If file name or line number is not set,
 * returns message and class name.
 */

static mrb_value
exc_inspect(mrb_state *mrb, mrb_value exc)
{
  mrb_value str, mesg, file, line;
  mrb_bool append_mesg;
  const char *cname;

  mesg = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "mesg"));
  file = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "file"));
  line = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "line"));

  append_mesg = !mrb_nil_p(mesg);
  if (append_mesg) {
    mesg = mrb_obj_as_string(mrb, mesg);
    append_mesg = RSTRING_LEN(mesg) > 0;
  }

  cname = mrb_obj_classname(mrb, exc);
  str = mrb_str_new_cstr(mrb, cname);
  if (mrb_string_p(file) && mrb_fixnum_p(line)) {
    if (append_mesg) {
      str = mrb_format(mrb, "%S:%S: %S (%S)", file, line, mesg, str);
    }
    else {
      str = mrb_format(mrb, "%S:%S: %S", file, line, str);
    }
  }
  else if (append_mesg) {
    str = mrb_format(mrb, "%S: %S", str, mesg);
  }
  return str;
}

void mrb_keep_backtrace(mrb_state *mrb, mrb_value exc);

static void
set_backtrace(mrb_state *mrb, mrb_value exc, mrb_value backtrace)
{
  if (!mrb_array_p(backtrace)) {
  type_err:
    mrb_raise(mrb, E_TYPE_ERROR, "backtrace must be Array of String");
  }
  else {
    const mrb_value *p = RARRAY_PTR(backtrace);
    const mrb_value *pend = p + RARRAY_LEN(backtrace);

    while (p < pend) {
      if (!mrb_string_p(*p)) goto type_err;
      p++;
    }
  }
  mrb_iv_set(mrb, exc, mrb_intern_lit(mrb, "backtrace"), backtrace);
}

static mrb_value
exc_set_backtrace(mrb_state *mrb, mrb_value exc)
{
  mrb_value backtrace;

  mrb_get_args(mrb, "o", &backtrace);
  set_backtrace(mrb, exc, backtrace);
  return backtrace;
}

static void
exc_debug_info(mrb_state *mrb, struct RObject *exc)
{
  mrb_callinfo *ci = mrb->c->ci;
  mrb_code *pc = ci->pc;

  if (mrb_obj_iv_defined(mrb, exc, mrb_intern_lit(mrb, "file"))) return;
  while (ci >= mrb->c->cibase) {
    mrb_code *err = ci->err;

    if (!err && pc) err = pc - 1;
    if (err && ci->proc && !MRB_PROC_CFUNC_P(ci->proc)) {
      mrb_irep *irep = ci->proc->body.irep;

      int32_t const line = mrb_debug_get_line(irep, err - irep->iseq);
      char const* file = mrb_debug_get_filename(irep, err - irep->iseq);
      if (line != -1 && file) {
        mrb_obj_iv_set(mrb, exc, mrb_intern_lit(mrb, "file"), mrb_str_new_cstr(mrb, file));
        mrb_obj_iv_set(mrb, exc, mrb_intern_lit(mrb, "line"), mrb_fixnum_value(line));
        return;
      }
    }
    pc = ci->pc;
    ci--;
  }
}

void
mrb_exc_set(mrb_state *mrb, mrb_value exc)
{
  if (mrb_nil_p(exc)) {
    mrb->exc = 0;
  }
  else {
    mrb->exc = mrb_obj_ptr(exc);
    if (mrb->gc.arena_idx > 0 &&
        (struct RBasic*)mrb->exc == mrb->gc.arena[mrb->gc.arena_idx-1]) {
      mrb->gc.arena_idx--;
    }
    if (!mrb->gc.out_of_memory && !MRB_FROZEN_P(mrb->exc)) {
      exc_debug_info(mrb, mrb->exc);
      mrb_keep_backtrace(mrb, exc);
    }
  }
}

MRB_API mrb_noreturn void
mrb_exc_raise(mrb_state *mrb, mrb_value exc)
{
  if (!mrb_obj_is_kind_of(mrb, exc, mrb->eException_class)) {
    mrb_raise(mrb, E_TYPE_ERROR, "exception object expected");
  }
  mrb_exc_set(mrb, exc);
  if (!mrb->jmp) {
    mrb_p(mrb, exc);
    abort();
  }
  MRB_THROW(mrb->jmp);
}

MRB_API mrb_noreturn void
mrb_raise(mrb_state *mrb, struct RClass *c, const char *msg)
{
  mrb_exc_raise(mrb, mrb_exc_new_str(mrb, c, mrb_str_new_cstr(mrb, msg)));
}

MRB_API mrb_value
mrb_vformat(mrb_state *mrb, const char *format, va_list ap)
{
  const char *p = format;
  const char *b = p;
  ptrdiff_t size;
  int ai0 = mrb_gc_arena_save(mrb);
  mrb_value ary = mrb_ary_new_capa(mrb, 4);
  int ai = mrb_gc_arena_save(mrb);

  while (*p) {
    const char c = *p++;

    if (c == '%') {
      if (*p == 'S') {
        mrb_value val;

        size = p - b - 1;
        mrb_ary_push(mrb, ary, mrb_str_new(mrb, b, size));
        val = va_arg(ap, mrb_value);
        mrb_ary_push(mrb, ary, mrb_obj_as_string(mrb, val));
        b = p + 1;
      }
    }
    else if (c == '\\') {
      if (*p) {
        size = p - b - 1;
        mrb_ary_push(mrb, ary, mrb_str_new(mrb, b, size));
        mrb_ary_push(mrb, ary, mrb_str_new(mrb, p, 1));
        b = ++p;
      }
      else {
        break;
      }
    }
    mrb_gc_arena_restore(mrb, ai);
  }
  if (b == format) {
    mrb_gc_arena_restore(mrb, ai0);
    return mrb_str_new_cstr(mrb, format);
  }
  else {
    mrb_value val;

    size = p - b;
    if (size > 0) {
      mrb_ary_push(mrb, ary, mrb_str_new(mrb, b, size));
    }
    val = mrb_ary_join(mrb, ary, mrb_nil_value());
    mrb_gc_arena_restore(mrb, ai0);
    mrb_gc_protect(mrb, val);
    return val;
  }
}

MRB_API mrb_value
mrb_format(mrb_state *mrb, const char *format, ...)
{
  va_list ap;
  mrb_value str;

  va_start(ap, format);
  str = mrb_vformat(mrb, format, ap);
  va_end(ap);

  return str;
}

static mrb_noreturn void
raise_va(mrb_state *mrb, struct RClass *c, const char *fmt, va_list ap, int argc, mrb_value *argv)
{
  mrb_value mesg;

  mesg = mrb_vformat(mrb, fmt, ap);
  if (argv == NULL) {
    argv = &mesg;
  }
  else {
    argv[0] = mesg;
  }
  mrb_exc_raise(mrb, mrb_obj_new(mrb, c, argc+1, argv));
}

MRB_API mrb_noreturn void
mrb_raisef(mrb_state *mrb, struct RClass *c, const char *fmt, ...)
{
  va_list args;

  va_start(args, fmt);
  raise_va(mrb, c, fmt, args, 0, NULL);
  va_end(args);
}

MRB_API mrb_noreturn void
mrb_name_error(mrb_state *mrb, mrb_sym id, const char *fmt, ...)
{
  mrb_value argv[2];
  va_list args;

  va_start(args, fmt);
  argv[1] = mrb_symbol_value(id);
  raise_va(mrb, E_NAME_ERROR, fmt, args, 1, argv);
  va_end(args);
}

MRB_API void
mrb_warn(mrb_state *mrb, const char *fmt, ...)
{
#ifndef MRB_DISABLE_STDIO
  va_list ap;
  mrb_value str;

  va_start(ap, fmt);
  str = mrb_vformat(mrb, fmt, ap);
  fputs("warning: ", stderr);
  fwrite(RSTRING_PTR(str), RSTRING_LEN(str), 1, stderr);
  va_end(ap);
#endif
}

MRB_API mrb_noreturn void
mrb_bug(mrb_state *mrb, const char *fmt, ...)
{
#ifndef MRB_DISABLE_STDIO
  va_list ap;
  mrb_value str;

  va_start(ap, fmt);
  str = mrb_vformat(mrb, fmt, ap);
  fputs("bug: ", stderr);
  fwrite(RSTRING_PTR(str), RSTRING_LEN(str), 1, stderr);
  va_end(ap);
#endif
  exit(EXIT_FAILURE);
}

MRB_API mrb_value
mrb_make_exception(mrb_state *mrb, mrb_int argc, const mrb_value *argv)
{
  mrb_value mesg;
  int n;

  mesg = mrb_nil_value();
  switch (argc) {
    case 0:
    break;
    case 1:
      if (mrb_nil_p(argv[0]))
        break;
      if (mrb_string_p(argv[0])) {
        mesg = mrb_exc_new_str(mrb, E_RUNTIME_ERROR, argv[0]);
        break;
      }
      n = 0;
      goto exception_call;

    case 2:
    case 3:
      n = 1;
exception_call:
      {
        mrb_sym exc = mrb_intern_lit(mrb, "exception");
        if (mrb_respond_to(mrb, argv[0], exc)) {
          mesg = mrb_funcall_argv(mrb, argv[0], exc, n, argv+1);
        }
        else {
          /* undef */
          mrb_raise(mrb, E_TYPE_ERROR, "exception class/object expected");
        }
      }

      break;
    default:
      mrb_raisef(mrb, E_ARGUMENT_ERROR, "wrong number of arguments (%S for 0..3)", mrb_fixnum_value(argc));
      break;
  }
  if (argc > 0) {
    if (!mrb_obj_is_kind_of(mrb, mesg, mrb->eException_class))
      mrb_raise(mrb, mrb->eException_class, "exception object expected");
    if (argc > 2)
      set_backtrace(mrb, mesg, argv[2]);
  }

  return mesg;
}

MRB_API void
mrb_sys_fail(mrb_state *mrb, const char *mesg)
{
  struct RClass *sce;
  mrb_int no;

  no = (mrb_int)errno;
  if (mrb_class_defined(mrb, "SystemCallError")) {
    sce = mrb_class_get(mrb, "SystemCallError");
    if (mesg != NULL) {
      mrb_funcall(mrb, mrb_obj_value(sce), "_sys_fail", 2, mrb_fixnum_value(no), mrb_str_new_cstr(mrb, mesg));
    }
    else {
      mrb_funcall(mrb, mrb_obj_value(sce), "_sys_fail", 1, mrb_fixnum_value(no));
    }
  }
  else {
    mrb_raise(mrb, E_RUNTIME_ERROR, mesg);
  }
}

MRB_API mrb_noreturn void
mrb_no_method_error(mrb_state *mrb, mrb_sym id, mrb_value args, char const* fmt, ...)
{
  mrb_value exc;
  mrb_value argv[3];
  va_list ap;

  va_start(ap, fmt);
  argv[0] = mrb_vformat(mrb, fmt, ap);
  argv[1] = mrb_symbol_value(id);
  argv[2] = args;
  va_end(ap);
  exc = mrb_obj_new(mrb, E_NOMETHOD_ERROR, 3, argv);
  mrb_exc_raise(mrb, exc);
}

void
mrb_init_exception(mrb_state *mrb)
{
  struct RClass *exception, *script_error, *stack_error, *nomem_error;

  mrb->eException_class = exception = mrb_define_class(mrb, "Exception", mrb->object_class); /* 15.2.22 */
  MRB_SET_INSTANCE_TT(exception, MRB_TT_EXCEPTION);
  mrb_define_class_method(mrb, exception, "exception", mrb_instance_new,  MRB_ARGS_ANY());
  mrb_define_method(mrb, exception, "exception",       exc_exception,     MRB_ARGS_ANY());
  mrb_define_method(mrb, exception, "initialize",      exc_initialize,    MRB_ARGS_ANY());
  mrb_define_method(mrb, exception, "to_s",            exc_to_s,          MRB_ARGS_NONE());
  mrb_define_method(mrb, exception, "message",         exc_message,       MRB_ARGS_NONE());
  mrb_define_method(mrb, exception, "inspect",         exc_inspect,       MRB_ARGS_NONE());
  mrb_define_method(mrb, exception, "backtrace",       mrb_exc_backtrace, MRB_ARGS_NONE());
  mrb_define_method(mrb, exception, "set_backtrace",   exc_set_backtrace, MRB_ARGS_REQ(1));

  mrb->eStandardError_class = mrb_define_class(mrb, "StandardError", mrb->eException_class); /* 15.2.23 */
  mrb_define_class(mrb, "RuntimeError", mrb->eStandardError_class);          /* 15.2.28 */
  script_error = mrb_define_class(mrb, "ScriptError", mrb->eException_class);                /* 15.2.37 */
  mrb_define_class(mrb, "SyntaxError", script_error);                                        /* 15.2.38 */
  stack_error = mrb_define_class(mrb, "SystemStackError", exception);
  mrb->stack_err = mrb_obj_ptr(mrb_exc_new_str_lit(mrb, stack_error, "stack level too deep"));

  nomem_error = mrb_define_class(mrb, "NoMemoryError", exception);
  mrb->nomem_err = mrb_obj_ptr(mrb_exc_new_str_lit(mrb, nomem_error, "Out of memory"));
#ifdef MRB_GC_FIXED_ARENA
  mrb->arena_err = mrb_obj_ptr(mrb_exc_new_str_lit(mrb, nomem_error, "arena overflow error"));
#endif
}