Class: Debugger::InfoCommand

Inherits:
Command
  • Object
show all
Defined in:
lib/ruby-debug/commands/info.rb

Overview

Implements debugger “info” command.

Constant Summary collapse

Subcommands = 
[
   ['args', 1, 'Argument variables of current stack frame'],
   ['breakpoints', 1, 'Status of user-settable breakpoints',
    'Without argument, list info about all breakpoints.  With an
integer argument, list info on that breakpoint.'],
   ['catch', 3, 'Exceptions that can be caught in the current stack frame'],
   ['display', 2, 'Expressions to display when program stops'],
   ['file', 4, 'Info about a particular file read in',
'
After the file name is supplied, you can list file attributes that
you wish to see.

Attributes include: "all", "basic", "breakpoint", "lines", "mtime", "path" 
and "sha1".'],
   ['files', 5, 'File names and timestamps of files read in'],
   ['global_variables', 2, 'Global variables'],
   ['instance_variables', 2, 
    'Instance variables of the current stack frame'],
   ['line', 2, 
    'Line number and file name of current position in source file'],
   ['locals', 2, 'Local variables of the current stack frame'],
   ['program', 2, 'Execution status of the program'],
   ['stack', 2, 'Backtrace of the stack'],
   ['thread', 6,  'List info about thread NUM', '
If no thread number is given, we list info for all threads. \'terse\' and \'verbose\' 
options are possible. If terse, just give summary thread name information. See 
"help info threads" for more detail about this summary information.

If \'verbose\' appended to the end of the command, then the entire
stack trace is given for each thread.'],
   ['threads', 7, 'information of currently-known threads', '
This information includes whether the thread is current (+), if it is
suspended ($), or ignored (!).  The thread number and the top stack
item. If \'verbose\' is given then the entire stack frame is shown.'],
   ['variables', 1, 
    'Local and instance variables of the current stack frame']
  ].map do |name, min, short_help, long_help| 
  SubcmdStruct.new(name, min, short_help, long_help)
end
InfoFileSubcommands = 
[
   ['all', 1, 
    'All file information available - breakpoints, lines, mtime, path, and sha1'],
   ['basic', 2, 
    'basic information - path, number of lines'],
   ['breakpoints', 2, 'Show trace line numbers',
    'These are the line number where a breakpoint can be set.'],
   ['lines', 1, 'Show number of lines in the file'],
   ['mtime', 1, 'Show modification time of file'],
   ['path', 4, 'Show full file path name for file'],
   ['sha1', 1, 'Show SHA1 hash of contents of the file']
  ].map do |name, min, short_help, long_help|
  SubcmdStruct.new(name, min, short_help, long_help)
end
InfoThreadSubcommands = 
[
   ['terse', 1,   'summary information'],
   ['verbose', 1, 'summary information and stack frame info'],
  ].map do |name, min, short_help, long_help|
  SubcmdStruct.new(name, min, short_help, long_help)
end

Constants inherited from Command

Command::DEF_OPTIONS

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Command

commands, #find, inherited, #initialize, load_commands, #match, method_missing, options, register_setting_get, register_setting_set, register_setting_var, settings, settings_map

Constructor Details

This class inherits a constructor from Debugger::Command

Class Method Details

.help(args) ⇒ Object 



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
 
# File 'lib/ruby-debug/commands/info.rb', line 426

def help(args)
  if args[1] 
    s = args[1]
    subcmd = Subcommands.find do |try_subcmd| 
      (s.size >= try_subcmd.min) and
        (try_subcmd.name[0..s.size-1] == s)
    end
    if subcmd
      str = subcmd.short_help + '.'
      if 'file' == subcmd.name and args[2]
        s = args[2]
        subsubcmd = InfoFileSubcommands.find do |try_subcmd|
          (s.size >= try_subcmd.min) and
            (try_subcmd.name[0..s.size-1] == s)
        end
        if subsubcmd
          str += "\n" + subsubcmd.short_help + '.'
        else
          str += "\nInvalid file attribute #{args[2]}."
        end
      else
        str += "\n" + subcmd.long_help if subcmd.long_help
      end
      return str
    else
      return "Invalid 'info' subcommand '#{args[1]}'."
    end
  end
  s = %{
    Generic command for showing things about the program being debugged.
    -- 
    List of info subcommands:
    --  
  }
  for subcmd in Subcommands do
    s += "info #{subcmd.name} -- #{subcmd.short_help}\n"
  end
  return s
end

.help_command ⇒ Object 



422
423
424
 
# File 'lib/ruby-debug/commands/info.rb', line 422

def help_command
  'info'
end

Instance Method Details

#execute ⇒ Object 



93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
 
# File 'lib/ruby-debug/commands/info.rb', line 93

def execute
  if !@match[1]
    errmsg "\"info\" must be followed by the name of an info command:\n"
    print "List of info subcommands:\n\n"
    for subcmd in Subcommands do
      print "info #{subcmd.name} -- #{subcmd.short_help}\n"
    end
  else
    args = @match[1].split(/[ \t]+/)
    param = args.shift
    subcmd = find(Subcommands, param)
    if subcmd
      send("info_#{subcmd.name}", *args)
    else
      errmsg "Unknown info command #{param}\n"
    end
  end
end

#info_args(*args) ⇒ Object 



112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
 
# File 'lib/ruby-debug/commands/info.rb', line 112

def info_args(*args)
  unless @state.context
    print "No frame selected.\n"
    return 
  end
  locals = @state.context.frame_locals(@state.frame_pos)
  args = @state.context.frame_args(@state.frame_pos)
  args.each do |name|
    s = "#{name} = #{locals[name].inspect}"
    if s.size > self.class.settings[:width]
      s[self.class.settings[:width]-3 .. -1] = "..."
    end
    print "#{s}\n"
  end
end

#info_breakpoints(*args) ⇒ Object 



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
 
# File 'lib/ruby-debug/commands/info.rb', line 128

def info_breakpoints(*args)
  unless @state.context
    print "info breakpoints not available here.\n"
    return 
  end
  unless Debugger.breakpoints.empty?
    brkpts = Debugger.breakpoints.sort_by{|b| b.id}
    unless args.empty?
      indices = args.map{|a| a.to_i}
      brkpts = brkpts.select{|b| indices.member?(b.id)}
      if brkpts.empty?
        errmsg "No breakpoints found among list given.\n"
        return
      end
    end
    print "Num Enb What\n"
    brkpts.each do |b|
      if b.expr.nil?
        print "%3d %s   at %s:%s\n", 
        b.id, (b.enabled? ? 'y' : 'n'), b.source, b.pos
      else
        print "%3d %s   at %s:%s if %s\n", 
        b.id, (b.enabled? ? 'y' : 'n'), b.source, b.pos, b.expr
      end
      hits = b.hit_count
      if hits > 0
        s = (hits > 1) ? 's' : ''
        print "\tbreakpoint already hit #{hits} time#{s}\n"
      end
    end
  else
    print "No breakpoints.\n"
  end
end

#info_display(*args) ⇒ Object 



163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
 
# File 'lib/ruby-debug/commands/info.rb', line 163

def info_display(*args)
  unless @state.context
    print "info display not available here.\n"
    return 
  end
  if @state.display.find{|d| d[0]}
    print "Auto-display expressions now in effect:\n"
    print "Num Enb Expression\n"
    n = 1
    for d in @state.display
      print "%3d: %s  %s\n", n, (d[0] ? 'y' : 'n'), d[1] if
        d[0] != nil
      n += 1
    end
  else
    print "There are no auto-display expressions now.\n"
  end
end

#info_file(*args) ⇒ Object 



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
 
# File 'lib/ruby-debug/commands/info.rb', line 182

def info_file(*args)
  unless args[0] 
    info_files
    return
  end
  file = args[0]
  param =  args[1]
  
  param = 'basic' unless param
  subcmd = find(InfoFileSubcommands, param)
  unless subcmd
    errmsg "Invalid parameter #{param}\n"
    return
  end
  
  unless LineCache::cached?(file)
    unless LineCache::cached_script?(file)
      print "File #{file} is not cached\n"
      return
    end
    LineCache::cache(file, Command.settings[:reload_source_on_change])
  end
  
  print "File %s", file
  path = LineCache.path(file)
  if %w(all basic path).member?(subcmd.name) and path != file
    print " - %s\n", path 
  else
    print "\n"
  end

  if %w(all basic lines).member?(subcmd.name)
    lines = LineCache.size(file)
    print "\t %d lines\n", lines if lines
  end

  if %w(all breakpoints).member?(subcmd.name)
    breakpoints = LineCache.trace_line_numbers(file)
    if breakpoints
      print "\tbreakpoint line numbers:\n" 
      print columnize(breakpoints.to_a.sort, self.class.settings[:width])
    end
  end

  if %w(all mtime).member?(subcmd.name)
    stat = LineCache.stat(file)
    print "\t%s\n", stat.mtime if stat
  end
  if %w(all sha1).member?(subcmd.name)
    print "\t%s\n", LineCache.sha1(file)
  end
end

#info_files(*args) ⇒ Object 



235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
 
# File 'lib/ruby-debug/commands/info.rb', line 235

def info_files(*args)
  files = LineCache::cached_files
  files += SCRIPT_LINES__.keys unless 'stat' == args[0] 
  files.uniq.sort.each do |file|
    stat = LineCache::stat(file)
    path = LineCache::path(file)
    print "File %s", file
    if path and path != file
      print " - %s\n", path 
    else
      print "\n"
    end
    print "\t%s\n", stat.mtime if stat
  end
end

#info_global_variables(*args) ⇒ Object 



383
384
385
386
387
388
389
 
# File 'lib/ruby-debug/commands/info.rb', line 383

def info_global_variables(*args)
  unless @state.context
    errmsg "info global_variables not available here.\n"
    return 
  end
  var_list(global_variables)
end

#info_instance_variables(*args) ⇒ Object 



251
252
253
254
255
256
257
258
 
# File 'lib/ruby-debug/commands/info.rb', line 251

def info_instance_variables(*args)
  unless @state.context
    print "info instance_variables not available here.\n"
    return 
  end
  obj = debug_eval('self')
  var_list(obj.instance_variables)
end

#info_line(*args) ⇒ Object 



260
261
262
263
264
265
266
 
# File 'lib/ruby-debug/commands/info.rb', line 260

def info_line(*args)
  unless @state.context
    errmsg "info line not available here.\n"
    return 
  end
  print "Line %d of \"%s\"\n",  @state.line, @state.file
end

#info_locals(*args) ⇒ Object 



268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
 
# File 'lib/ruby-debug/commands/info.rb', line 268

def info_locals(*args)
  unless @state.context
    errmsg "info line not available here.\n"
    return 
  end
  locals = @state.context.frame_locals(@state.frame_pos)
  locals.keys.sort.each do |name|
    ### FIXME: make a common routine
    begin
      s = "#{name} = #{locals[name].inspect}"
    rescue
      begin
      s = "#{name} = #{locals[name].to_s}"
      rescue
        s = "*Error in evaluation*"
      end
    end  
    if s.size > self.class.settings[:width]
      s[self.class.settings[:width]-3 .. -1] = "..."
    end
    print "#{s}\n"
  end
end

#info_program(*args) ⇒ Object 



292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
 
# File 'lib/ruby-debug/commands/info.rb', line 292

def info_program(*args)
  if not @state.context
    print "The program being debugged is not being run.\n"
    return
  elsif @state.context.dead? 
    print "The program crashed.\n"
    if Debugger.last_exception
      print("Exception: #{Debugger.last_exception.inspect}\n")
    end
    return
  end
  
  print "Program stopped. "
  case @state.context.stop_reason
  when :step
    print "It stopped after stepping, next'ing or initial start.\n"
  when :breakpoint
    print("It stopped at a breakpoint.\n")
  when :catchpoint
    print("It stopped at a catchpoint.\n")
  else
    print "unknown reason: %s\n" % @state.context.stop_reason.to_s
  end
end

#info_stack(*args) ⇒ Object 



317
318
319
320
321
322
323
324
325
326
327
328
329
330
 
# File 'lib/ruby-debug/commands/info.rb', line 317

def info_stack(*args)
  if not @state.context
    errmsg "info stack not available here.\n"
    return
  end
  (0...@state.context.stack_size).each do |idx|
    if idx == @state.frame_pos
      print "--> "
    else
      print "    "
    end
    print_frame(idx)
  end
end

#info_thread(*args) ⇒ Object 



365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
 
# File 'lib/ruby-debug/commands/info.rb', line 365

def info_thread(*args)
  unless args[0]
    info_threads(args[0])
    return
  end
  ok, verbose = info_thread_preamble(args[1])
  return unless ok
  c = parse_thread_num("info thread" , args[0])
  return unless c
  display_context(c, !verbose)
  if verbose and not c.ignored?
    (0...c.stack_size).each do |idx|
      print "\t"
      print_frame(idx, false, c) 
    end
  end
end

#info_threads(*args) ⇒ Object 



351
352
353
354
355
356
357
358
359
360
361
362
363
 
# File 'lib/ruby-debug/commands/info.rb', line 351

def info_threads(*args)
  ok, verbose = info_thread_preamble(args[0])
  return unless ok
  threads = Debugger.contexts.sort_by{|c| c.thnum}.each do |c|
    display_context(c, !verbose)
    if verbose and not c.ignored?
      (0...c.stack_size).each do |idx|
        print "\t"
        print_frame(idx, false, c)
      end
    end
  end
end

#info_variables(*args) ⇒ Object 



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
 
# File 'lib/ruby-debug/commands/info.rb', line 391

def info_variables(*args)
  if not @state.context
    errmsg "info variables not available here.\n"
    return
  end
  obj = debug_eval('self')
  locals = @state.context.frame_locals(@state.frame_pos)
  locals['self'] = @state.context.frame_self(@state.frame_pos)
  locals.keys.sort.each do |name|
    next if name =~ /^__dbg_/ # skip debugger pollution
    ### FIXME: make a common routine
    begin
      s = "#{name} = #{locals[name].inspect}"
    rescue
      begin
        s = "#{name} = #{locals[name].to_s}"
      rescue
        s = "#{name} = *Error in evaluation*"
      end
    end
    if s.size > self.class.settings[:width]
      s[self.class.settings[:width]-3 .. -1] = "..."
    end
    s.gsub!('%', '%%')  # protect against printf format strings
    print "#{s}\n"
  end
  var_list(obj.instance_variables, obj.instance_eval{binding()})
  var_class_self
end

#regexp ⇒ Object 



89
90
91
 
# File 'lib/ruby-debug/commands/info.rb', line 89

def regexp
  /^\s* i(?:nfo)? (?:\s+(.*))?$/ix
end