Class: DEBUGGER__::Context

Inherits:
Object
  • Object
show all
Defined in:
lib/debug.rb

Constant Summary collapse

DEBUG_LAST_CMD = 
[]

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Context

Returns a new instance of Context.



46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
 
# File 'lib/debug.rb', line 46

def initialize
  if Thread.current == Thread.main
    @stop_next = 1
  else
    @stop_next = 0
  end
  @last_file = nil
  @file = nil
  @line = nil
  @no_step = nil
  @frames = []
  @finish_pos = 0
  @trace = false
  @catch = "StandardError"
  @suspend_next = false
end

Instance Method Details

#break_points ⇒ Object 



106
107
108
 
# File 'lib/debug.rb', line 106

def break_points
  DEBUGGER__.break_points
end

#check_break_points(file, klass, pos, binding, id) ⇒ Object 



629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
 
# File 'lib/debug.rb', line 629

def check_break_points(file, klass, pos, binding, id)
  return false if break_points.empty?
  n = 1
  for b in break_points
    if b[0]           # valid
      if b[1] == 0    # breakpoint
        if (b[2] == file and b[3] == pos) or
            (klass and b[2] == klass and b[3] == pos)
          stdout.printf "Breakpoint %d, %s at %s:%s\n", n, debug_funcname(id), file, pos
          return true
        end
      elsif b[1] == 1 # watchpoint
        if debug_silent_eval(b[2], binding)
          stdout.printf "Watchpoint %d, %s at %s:%s\n", n, debug_funcname(id), file, pos
          return true
        end
      end
    end
    n += 1
  end
  return false
end

#check_suspend ⇒ Object 



83
84
85
86
87
88
89
90
91
92
 
# File 'lib/debug.rb', line 83

def check_suspend
  while MUTEX.synchronize {
      if @suspend_next
        DEBUGGER__.waiting.push Thread.current
        @suspend_next = false
        true
      end
    }
  end
end

#clear_suspend ⇒ Object 



71
72
73
 
# File 'lib/debug.rb', line 71

def clear_suspend
  @suspend_next = false
end

#context(th) ⇒ Object 



114
115
116
 
# File 'lib/debug.rb', line 114

def context(th)
  DEBUGGER__.context(th)
end

#debug_command(file, line, id, binding) ⇒ Object 



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
 
# File 'lib/debug.rb', line 220

def debug_command(file, line, id, binding)
  MUTEX.lock
  unless defined?($debugger_restart) and $debugger_restart
    callcc{|c| $debugger_restart = c}
  end
  set_last_thread(Thread.current)
  frame_pos = 0
  binding_file = file
  binding_line = line
  previous_line = nil
  if ENV['EMACS']
    stdout.printf "\032\032%s:%d:\n", binding_file, binding_line
  else
    stdout.printf "%s:%d:%s", binding_file, binding_line,
      line_at(binding_file, binding_line)
  end
  @frames[0] = [binding, file, line, id]
  display_expressions(binding)
  prompt = true
  while prompt and input = readline("(rdb:%d) "%thnum(), true)
    catch(:debug_error) do
      if input == ""
        next unless DEBUG_LAST_CMD[0]
        input = DEBUG_LAST_CMD[0]
        stdout.print input, "\n"
      else
        DEBUG_LAST_CMD[0] = input
      end

      case input
      when /^\s*tr(?:ace)?(?:\s+(on|off))?(?:\s+(all))?$/
        if defined?( $2 )
          if $1 == 'on'
            set_trace_all true
          else
            set_trace_all false
          end
        elsif defined?( $1 )
          if $1 == 'on'
            set_trace true
          else
            set_trace false
          end
        end
        if trace?
          stdout.print "Trace on.\n"
        else
          stdout.print "Trace off.\n"
        end

      when /^\s*b(?:reak)?\s+(?:(.+):)?([^.:]+)$/
        pos = $2
        if $1
          klass = debug_silent_eval($1, binding)
          file = $1
        end
        if pos =~ /^\d+$/
          pname = pos
          pos = pos.to_i
        else
          pname = pos = pos.intern.id2name
        end
        break_points.push [true, 0, klass || file, pos]
        stdout.printf "Set breakpoint %d at %s:%s\n", break_points.size, klass || file, pname

      when /^\s*b(?:reak)?\s+(.+)[#.]([^.:]+)$/
        pos = $2.intern.id2name
        klass = debug_eval($1, binding)
        break_points.push [true, 0, klass, pos]
        stdout.printf "Set breakpoint %d at %s.%s\n", break_points.size, klass, pos

      when /^\s*wat(?:ch)?\s+(.+)$/
        exp = $1
        break_points.push [true, 1, exp]
        stdout.printf "Set watchpoint %d:%s\n", break_points.size, exp

      when /^\s*b(?:reak)?$/
        if break_points.find{|b| b[1] == 0}
          n = 1
          stdout.print "Breakpoints:\n"
          break_points.each do |b|
            if b[0] and b[1] == 0
              stdout.printf "  %d %s:%s\n", n, b[2], b[3]
            end
            n += 1
          end
        end
        if break_points.find{|b| b[1] == 1}
          n = 1
          stdout.print "\n"
          stdout.print "Watchpoints:\n"
          for b in break_points
            if b[0] and b[1] == 1
              stdout.printf "  %d %s\n", n, b[2]
            end
            n += 1
          end
        end
        if break_points.size == 0
          stdout.print "No breakpoints\n"
        else
          stdout.print "\n"
        end

      when /^\s*del(?:ete)?(?:\s+(\d+))?$/
        pos = $1
        unless pos
          input = readline("Clear all breakpoints? (y/n) ", false)
          if input == "y"
            for b in break_points
              b[0] = false
            end
          end
        else
          pos = pos.to_i
          if break_points[pos-1]
            break_points[pos-1][0] = false
          else
            stdout.printf "Breakpoint %d is not defined\n", pos
          end
        end

      when /^\s*disp(?:lay)?\s+(.+)$/
        exp = $1
        display.push [true, exp]
        stdout.printf "%d: ", display.size
        display_expression(exp, binding)

      when /^\s*disp(?:lay)?$/
        display_expressions(binding)

      when /^\s*undisp(?:lay)?(?:\s+(\d+))?$/
        pos = $1
        unless pos
          input = readline("Clear all expressions? (y/n) ", false)
          if input == "y"
            for d in display
              d[0] = false
            end
          end
        else
          pos = pos.to_i
          if display[pos-1]
            display[pos-1][0] = false
          else
            stdout.printf "Display expression %d is not defined\n", pos
          end
        end

      when /^\s*c(?:ont)?$/
        prompt = false

      when /^\s*s(?:tep)?(?:\s+(\d+))?$/
        if $1
          lev = $1.to_i
        else
          lev = 1
        end
        @stop_next = lev
        prompt = false

      when /^\s*n(?:ext)?(?:\s+(\d+))?$/
        if $1
          lev = $1.to_i
        else
          lev = 1
        end
        @stop_next = lev
        @no_step = @frames.size - frame_pos
        prompt = false

      when /^\s*w(?:here)?$/, /^\s*f(?:rame)?$/
        display_frames(frame_pos)

      when /^\s*l(?:ist)?(?:\s+(.+))?$/
        if not $1
          b = previous_line ? previous_line + 10 : binding_line - 5
          e = b + 9
        elsif $1 == '-'
          b = previous_line ? previous_line - 10 : binding_line - 5
          e = b + 9
        else
          b, e = $1.split(/[-,]/)
          if e
            b = b.to_i
            e = e.to_i
          else
            b = b.to_i - 5
            e = b + 9
          end
        end
        previous_line = b
        display_list(b, e, binding_file, binding_line)

      when /^\s*up(?:\s+(\d+))?$/
        previous_line = nil
        if $1
          lev = $1.to_i
        else
          lev = 1
        end
        frame_pos += lev
        if frame_pos >= @frames.size
          frame_pos = @frames.size - 1
          stdout.print "At toplevel\n"
        end
        binding, binding_file, binding_line = @frames[frame_pos]
        stdout.print format_frame(frame_pos)

      when /^\s*down(?:\s+(\d+))?$/
        previous_line = nil
        if $1
          lev = $1.to_i
        else
          lev = 1
        end
        frame_pos -= lev
        if frame_pos < 0
          frame_pos = 0
          stdout.print "At stack bottom\n"
        end
        binding, binding_file, binding_line = @frames[frame_pos]
        stdout.print format_frame(frame_pos)

      when /^\s*fin(?:ish)?$/
        if frame_pos == @frames.size
          stdout.print "\"finish\" not meaningful in the outermost frame.\n"
        else
          @finish_pos = @frames.size - frame_pos
          frame_pos = 0
          prompt = false
        end

      when /^\s*cat(?:ch)?(?:\s+(.+))?$/
        if $1
          excn = $1
          if excn == 'off'
            @catch = nil
            stdout.print "Clear catchpoint.\n"
          else
            @catch = excn
            stdout.printf "Set catchpoint %s.\n", @catch
          end
        else
          if @catch
            stdout.printf "Catchpoint %s.\n", @catch
          else
            stdout.print "No catchpoint.\n"
          end
        end

      when /^\s*q(?:uit)?$/
        input = readline("Really quit? (y/n) ", false)
        if input == "y"
          exit!  # exit -> exit!: No graceful way to stop threads...
        end

      when /^\s*v(?:ar)?\s+/
        debug_variable_info($', binding)

      when /^\s*m(?:ethod)?\s+/
        debug_method_info($', binding)

      when /^\s*th(?:read)?\s+/
        if DEBUGGER__.debug_thread_info($', binding) == :cont
          prompt = false
        end

      when /^\s*pp\s+/
        PP.pp(debug_eval($', binding), stdout)

      when /^\s*p\s+/
        stdout.printf "%s\n", debug_eval($', binding).inspect

      when /^\s*r(?:estart)?$/
        $debugger_restart.call

      when /^\s*h(?:elp)?$/
        debug_print_help()

      else
        v = debug_eval(input, binding)
        stdout.printf "%s\n", v.inspect
      end
    end
  end
  MUTEX.unlock
  resume_all
end

#debug_eval(str, binding) ⇒ Object 



126
127
128
129
130
131
132
133
134
135
136
137
 
# File 'lib/debug.rb', line 126

def debug_eval(str, binding)
  begin
    eval(str, binding)
  rescue StandardError, ScriptError => e
    at = eval("caller(1)", binding)
    stdout.printf "%s:%s\n", at.shift, e.to_s.sub(/\(eval\):1:(in `.*?':)?/, '')
    for i in at
      stdout.printf "\tfrom %s\n", i
    end
    throw :debug_error
  end
end

#debug_funcname(id) ⇒ Object 



621
622
623
624
625
626
627
 
# File 'lib/debug.rb', line 621

def debug_funcname(id)
  if id.nil?
    "toplevel"
  else
    id.id2name
  end
end

#debug_method_info(input, binding) ⇒ Object 



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
 
# File 'lib/debug.rb', line 176

def debug_method_info(input, binding)
  case input
  when /^i(:?nstance)?\s+/
    obj = debug_eval($', binding)

    len = 0
    for v in obj.methods.sort
      len += v.size + 1
      if len > 70
        len = v.size + 1
        stdout.print "\n"
      end
      stdout.print v, " "
    end
    stdout.print "\n"

  else
    obj = debug_eval(input, binding)
    unless obj.kind_of? Module
      stdout.print "Should be Class/Module: ", input, "\n"
    else
      len = 0
      for v in obj.instance_methods(false).sort
        len += v.size + 1
        if len > 70
          len = v.size + 1
          stdout.print "\n"
        end
        stdout.print v, " "
      end
      stdout.print "\n"
    end
  end
end

#debug_print_help ⇒ Object 



510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
 
# File 'lib/debug.rb', line 510

def debug_print_help
  stdout.print <<EOHELP
Debugger help v.-0.002b
Commands
  b[reak] [file:|class:]<line|method>
  b[reak] [class.]<line|method>
                         set breakpoint to some position
  wat[ch] <expression>       set watchpoint to some expression
  cat[ch] (<exception>|off)  set catchpoint to an exception
  b[reak]                    list breakpoints
  cat[ch]                    show catchpoint
  del[ete][ nnn]             delete some or all breakpoints
  disp[lay] <expression>     add expression into display expression list
  undisp[lay][ nnn]          delete one particular or all display expressions
  c[ont]                     run until program ends or hit breakpoint
  s[tep][ nnn]               step (into methods) one line or till line nnn
  n[ext][ nnn]               go over one line or till line nnn
  w[here]                    display frames
  f[rame]                    alias for where
  l[ist][ (-|nn-mm)]         list program, - lists backwards
                         nn-mm lists given lines
  up[ nn]                    move to higher frame
  down[ nn]                  move to lower frame
  fin[ish]                   return to outer frame
  tr[ace] (on|off)           set trace mode of current thread
  tr[ace] (on|off) all       set trace mode of all threads
  q[uit]                     exit from debugger
  v[ar] g[lobal]             show global variables
  v[ar] l[ocal]              show local variables
  v[ar] i[nstance] <object>  show instance variables of object
  v[ar] c[onst] <object>     show constants of object
  m[ethod] i[nstance] <obj>  show methods of object
  m[ethod] <class|module>    show instance methods of class or module
  th[read] l[ist]            list all threads
  th[read] c[ur[rent]]       show current thread
  th[read] [sw[itch]] <nnn>  switch thread context to nnn
  th[read] stop <nnn>        stop thread nnn
  th[read] resume <nnn>      resume thread nnn
  p expression               evaluate expression and print its value
  h[elp]                     print this help
  <everything else>          evaluate
EOHELP
end

#debug_silent_eval(str, binding) ⇒ Object 



139
140
141
142
143
144
145
 
# File 'lib/debug.rb', line 139

def debug_silent_eval(str, binding)
  begin
    eval(str, binding)
  rescue StandardError, ScriptError
    nil
  end
end

#debug_variable_info(input, binding) ⇒ Object 



154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
 
# File 'lib/debug.rb', line 154

def debug_variable_info(input, binding)
  case input
  when /^\s*g(?:lobal)?\s*$/
    var_list(global_variables, binding)

  when /^\s*l(?:ocal)?\s*$/
    var_list(eval("local_variables", binding), binding)

  when /^\s*i(?:nstance)?\s+/
    obj = debug_eval($', binding)
    var_list(obj.instance_variables, obj.instance_eval{binding()})

  when /^\s*c(?:onst(?:ant)?)?\s+/
    obj = debug_eval($', binding)
    unless obj.kind_of? Module
      stdout.print "Should be Class/Module: ", $', "\n"
    else
      var_list(obj.constants, obj.module_eval{binding()})
    end
  end
end

#display ⇒ Object 



110
111
112
 
# File 'lib/debug.rb', line 110

def display
  DEBUGGER__.display
end

#display_expression(exp, binding) ⇒ Object 



565
566
567
 
# File 'lib/debug.rb', line 565

def display_expression(exp, binding)
  stdout.printf "%s = %s\n", exp, debug_silent_eval(exp, binding).to_s
end

#display_expressions(binding) ⇒ Object 



554
555
556
557
558
559
560
561
562
563
 
# File 'lib/debug.rb', line 554

def display_expressions(binding)
  n = 1
  for d in display
    if d[0]
      stdout.printf "%d: ", n
      display_expression(d[1], binding)
    end
    n += 1
  end
end

#display_frames(pos) ⇒ Object 



576
577
578
579
580
581
582
583
584
585
 
# File 'lib/debug.rb', line 576

def display_frames(pos)
  0.upto(@frames.size - 1) do |n|
    if n == pos
      stdout.print "--> "
    else
      stdout.print "    "
    end
    stdout.print format_frame(n)
  end
end

#display_list(b, e, file, line) ⇒ Object 



593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
 
# File 'lib/debug.rb', line 593

def display_list(b, e, file, line)
  stdout.printf "[%d, %d] in %s\n", b, e, file
  if lines = SCRIPT_LINES__[file] and lines != true
    b.upto(e) do |n|
      if n > 0 && lines[n-1]
        if n == line
          stdout.printf "=> %d  %s\n", n, lines[n-1].chomp
        else
          stdout.printf "   %d  %s\n", n, lines[n-1].chomp
        end
      end
    end
  else
    stdout.printf "No sourcefile available for %s\n", file
  end
end

#excn_handle(file, line, id, binding) ⇒ Object 



652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
 
# File 'lib/debug.rb', line 652

def excn_handle(file, line, id, binding)
  if $!.class <= SystemExit
    set_trace_func nil
    exit
  end

  if @catch and ($!.class.ancestors.find { |e| e.to_s == @catch })
    stdout.printf "%s:%d: `%s' (%s)\n", file, line, $!, $!.class
    fs = @frames.size
    tb = caller(0)[-fs..-1]
    if tb
      for i in tb
        stdout.printf "\tfrom %s\n", i
      end
    end
    suspend_all
    debug_command(file, line, id, binding)
  end
end

#format_frame(pos) ⇒ Object 



587
588
589
590
591
 
# File 'lib/debug.rb', line 587

def format_frame(pos)
  _, file, line, id = @frames[pos]
  sprintf "#%d %s:%s%s\n", pos + 1, file, line,
    (id ? ":in `#{id.id2name}'" : "")
end

#frame_set_pos(file, line) ⇒ Object 



569
570
571
572
573
574
 
# File 'lib/debug.rb', line 569

def frame_set_pos(file, line)
  if @frames[0]
    @frames[0][1] = file
    @frames[0][2] = line
  end
end

#line_at(file, line) ⇒ Object 



610
611
612
613
614
615
616
617
618
619
 
# File 'lib/debug.rb', line 610

def line_at(file, line)
  lines = SCRIPT_LINES__[file]
  if lines
    return "\n" if lines == true
    line = lines[line-1]
    return "\n" unless line
    return line
  end
  return "\n"
end

#resume_all ⇒ Object 



79
80
81
 
# File 'lib/debug.rb', line 79

def resume_all
  DEBUGGER__.resume
end

#set_last_thread(th) ⇒ Object 



122
123
124
 
# File 'lib/debug.rb', line 122

def set_last_thread(th)
  DEBUGGER__.set_last_thread(th)
end

#set_suspend ⇒ Object 



67
68
69
 
# File 'lib/debug.rb', line 67

def set_suspend
  @suspend_next = true
end

#set_trace(arg) ⇒ Object 



98
99
100
 
# File 'lib/debug.rb', line 98

def set_trace(arg)
  @trace = arg
end

#set_trace_all(arg) ⇒ Object 



118
119
120
 
# File 'lib/debug.rb', line 118

def set_trace_all(arg)
  DEBUGGER__.set_trace(arg)
end

#stdout ⇒ Object 



102
103
104
 
# File 'lib/debug.rb', line 102

def stdout
  DEBUGGER__.stdout
end

#stop_next(n = 1) ⇒ Object 



63
64
65
 
# File 'lib/debug.rb', line 63

def stop_next(n=1)
  @stop_next = n
end

#suspend_all ⇒ Object 



75
76
77
 
# File 'lib/debug.rb', line 75

def suspend_all
  DEBUGGER__.suspend
end

#thnum ⇒ Object 



211
212
213
214
215
216
217
218
 
# File 'lib/debug.rb', line 211

def thnum
  num = DEBUGGER__.instance_eval{@thread_list[Thread.current]}
  unless num
    DEBUGGER__.make_thread_list
    num = DEBUGGER__.instance_eval{@thread_list[Thread.current]}
  end
  num
end

#trace? ⇒ Boolean

Returns:

  • (Boolean) 


94
95
96
 
# File 'lib/debug.rb', line 94

def trace?
  @trace
end

#trace_func(event, file, line, id, binding, klass) ⇒ Object 



672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
 
# File 'lib/debug.rb', line 672

def trace_func(event, file, line, id, binding, klass)
  Tracer.trace_func(event, file, line, id, binding, klass) if trace?
  context(Thread.current).check_suspend
  @file = file
  @line = line
  case event
  when 'line'
    frame_set_pos(file, line)
    if !@no_step or @frames.size == @no_step
      @stop_next -= 1
      @stop_next = -1 if @stop_next < 0
    elsif @frames.size < @no_step
      @stop_next = 0          # break here before leaving...
    else
      # nothing to do. skipped.
    end
    if @stop_next == 0 or check_break_points(file, nil, line, binding, id)
      @no_step = nil
      suspend_all
      debug_command(file, line, id, binding)
    end

  when 'call'
    @frames.unshift [binding, file, line, id]
    if check_break_points(file, klass, id.id2name, binding, id)
      suspend_all
      debug_command(file, line, id, binding)
    end

  when 'c-call'
    frame_set_pos(file, line)

  when 'class'
    @frames.unshift [binding, file, line, id]

  when 'return', 'end'
    if @frames.size == @finish_pos
      @stop_next = 1
      @finish_pos = 0
    end
    @frames.shift

  when 'raise'
    excn_handle(file, line, id, binding)

  end
  @last_file = file
end

#var_list(ary, binding) ⇒ Object 



147
148
149
150
151
152
 
# File 'lib/debug.rb', line 147

def var_list(ary, binding)
  ary.sort!
  for v in ary
    stdout.printf "  %s => %s\n", v, eval(v.to_s, binding).inspect
  end
end