Class: Tracer

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

Overview

tracer main class

Constant Summary collapse

EVENT_SYMBOL = 
{
  "line" => "-",
  "call" => ">",
  "return" => "<",
  "class" => "C",
  "end" => "E",
  "raise" => "^",
  "c-call" => "}",
  "c-return" => "{",
  "unknown" => "?"
}
Single = 
new

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Tracer

Returns a new instance of Tracer.



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# File 'lib/tracer.rb', line 55

def initialize
  @threads = Hash.new
  if defined? Thread.main
    @threads[Thread.main.object_id] = 0
  else
    @threads[Thread.current.object_id] = 0
  end

  @get_line_procs = {}

  @filters = []
end

Class Attribute Details

.display_c_call ⇒ Object Also known as: display_c_call?

display builtin method call?



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# File 'lib/tracer.rb', line 32

def display_c_call
  @display_c_call
end

.display_process_id ⇒ Object Also known as: display_process_id?

display process id?



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# File 'lib/tracer.rb', line 24

def display_process_id
  @display_process_id
end

.display_thread_id ⇒ Object Also known as: display_thread_id?

display thread id?



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# File 'lib/tracer.rb', line 28

def display_thread_id
  @display_thread_id
end

.stdout ⇒ Object

Returns the value of attribute stdout



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# File 'lib/tracer.rb', line 20

def stdout
  @stdout
end

.stdout_mutex ⇒ Object (readonly)

Returns the value of attribute stdout_mutex



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# File 'lib/tracer.rb', line 21

def stdout_mutex
  @stdout_mutex
end

.verbose ⇒ Object Also known as: verbose?

Returns the value of attribute verbose



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# File 'lib/tracer.rb', line 17

def verbose
  @verbose
end

Class Method Details

.add_filter(p = proc) ⇒ Object 



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# File 'lib/tracer.rb', line 179

def Tracer.add_filter(p = proc)
  Single.add_filter(p)
end

.off ⇒ Object 



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# File 'lib/tracer.rb', line 171

def Tracer.off
  Single.off
end

.on ⇒ Object 



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# File 'lib/tracer.rb', line 163

def Tracer.on
  if block_given?
    Single.on{yield}
  else
    Single.on
  end
end

.set_get_line_procs(file_name, p = proc) ⇒ Object 



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# File 'lib/tracer.rb', line 175

def Tracer.set_get_line_procs(file_name, p = proc)
  Single.set_get_line_procs(file_name, p)
end

Instance Method Details

#add_filter(p = proc) ⇒ Object 



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# File 'lib/tracer.rb', line 91

def add_filter(p = proc)
  @filters.push p
end

#get_line(file, line) ⇒ Object 



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# File 'lib/tracer.rb', line 99

def get_line(file, line)
  if p = @get_line_procs[file]
    return p.call(line)
  end

  unless list = SCRIPT_LINES__[file]
    begin
	f = File::open(file)
	begin
 SCRIPT_LINES__[file] = list = f.readlines
	ensure
 f.close
	end
    rescue
	SCRIPT_LINES__[file] = list = []
    end
  end

  if l = list[line - 1]
    l
  else
    "-\n"
  end
end

#get_thread_no ⇒ Object 



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# File 'lib/tracer.rb', line 124

def get_thread_no
  if no = @threads[Thread.current.object_id]
    no
  else
    @threads[Thread.current.object_id] = @threads.size
  end
end

#off ⇒ Object 



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# File 'lib/tracer.rb', line 86

def off
  set_trace_func nil
  stdout.print "Trace off\n" if Tracer.verbose?
end

#on ⇒ Object 



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# File 'lib/tracer.rb', line 72

def on
  if block_given?
    on
    begin
	yield
    ensure
	off
    end
  else
    set_trace_func method(:trace_func).to_proc
    stdout.print "Trace on\n" if Tracer.verbose?
  end
end

#set_get_line_procs(file, p = proc) ⇒ Object 



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# File 'lib/tracer.rb', line 95

def set_get_line_procs(file, p = proc)
  @get_line_procs[file] = p
end

#stdout ⇒ Object 



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# File 'lib/tracer.rb', line 68

def stdout
  Tracer.stdout
end

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



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# File 'lib/tracer.rb', line 132

def trace_func(event, file, line, id, binding, klass, *)
  return if file == __FILE__

  for p in @filters
    return unless p.call event, file, line, id, binding, klass
  end

  return unless Tracer::display_c_call? or 
    event != "c-call" && event != "c-return"

  Tracer::stdout_mutex.synchronize do
    if EVENT_SYMBOL[event]
	stdout.printf("<%d>", $$) if Tracer::display_process_id?
	stdout.printf("#%d:", get_thread_no) if Tracer::display_thread_id?
	if line == 0
 source = "?\n"
	else
 source = get_line(file, line)
	end
	printf("%s:%d:%s:%s: %s",
      file,
      line,
      klass || '', 
      EVENT_SYMBOL[event],
      source)
    end
  end

end