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Edit File : tracer.rb \| Size : 6.48 KB
# frozen_string_literal: false #-- # $Release Version: 0.3$ # $Revision: 1.12 $ ## # Outputs a source level execution trace of a Ruby program. # # It does this by registering an event handler with Kernel#set_trace_func for # processing incoming events. It also provides methods for filtering unwanted # trace output (see Tracer.add_filter, Tracer.on, and Tracer.off). # # == Example # # Consider the following Ruby script # # class A # def square(a) # return aa # end # end # # a = A.new # a.square(5) # # Running the above script using <code>ruby -r tracer example.rb</code> will # output the following trace to STDOUT (Note you can also explicitly # <code>require 'tracer'</code>) # # #0:<internal:lib/rubygems/custom_require>:38:Kernel:<: - # #0:example.rb:3::-: class A # #0:example.rb:3::C: class A # #0:example.rb:4::-: def square(a) # #0:example.rb:7::E: end # #0:example.rb:9::-: a = A.new # #0:example.rb:10::-: a.square(5) # #0:example.rb:4:A:>: def square(a) # #0:example.rb:5:A:-: return aa # #0:example.rb:6:A:<: end # \| \| \| \| \| # \| \| \| \| ---------------------+ event # \| \| \| ------------------------+ class # \| \| --------------------------+ line # \| ------------------------------------+ filename # ---------------------------------------+ thread # # Symbol table used for displaying incoming events: # # +}+:: call a C-language routine # +{+:: return from a C-language routine # +>+:: call a Ruby method # +C+:: start a class or module definition # +E+:: finish a class or module definition # +-+:: execute code on a new line # +^+:: raise an exception # +<+:: return from a Ruby method # # == Copyright # # by Keiju ISHITSUKA(keiju@ishitsuka.com) # class Tracer class << self # display additional debug information (defaults to false) attr_accessor :verbose alias verbose? verbose # output stream used to output trace (defaults to STDOUT) attr_accessor :stdout # mutex lock used by tracer for displaying trace output attr_reader :stdout_mutex # display process id in trace output (defaults to false) attr_accessor :display_process_id alias display_process_id? display_process_id # display thread id in trace output (defaults to true) attr_accessor :display_thread_id alias display_thread_id? display_thread_id # display C-routine calls in trace output (defaults to false) attr_accessor :display_c_call alias display_c_call? display_c_call end Tracer::stdout = STDOUT Tracer::verbose = false Tracer::display_process_id = false Tracer::display_thread_id = true Tracer::display_c_call = false @stdout_mutex = Thread::Mutex.new # Symbol table used for displaying trace information EVENT_SYMBOL = { "line" => "-", "call" => ">", "return" => "<", "class" => "C", "end" => "E", "raise" => "^", "c-call" => "}", "c-return" => "{", "unknown" => "?" } def initialize # :nodoc: @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 def stdout # :nodoc: Tracer.stdout end def on # :nodoc: 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 def off # :nodoc: set_trace_func nil stdout.print "Trace off\n" if Tracer.verbose? end def add_filter(p = nil, &b) # :nodoc: p \|\|= b @filters.push p end def set_get_line_procs(file, p = nil, &b) # :nodoc: p \|\|= b @get_line_procs[file] = p end def get_line(file, line) # :nodoc: if p = @get_line_procs[file] return p.call(line) end unless list = SCRIPT_LINES__[file] list = File.readlines(file) rescue [] SCRIPT_LINES__[file] = list end if l = list[line - 1] l else "-\n" end end def get_thread_no # :nodoc: if no = @threads[Thread.current.object_id] no else @threads[Thread.current.object_id] = @threads.size end end def trace_func(event, file, line, id, binding, klass, ) # :nodoc: 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 stdout.printf("%s:%d:%s:%s: %s", file, line, klass \|\| '', EVENT_SYMBOL[event], source) end end end # Reference to singleton instance of Tracer Single = new ## # Start tracing # # === Example # # Tracer.on # # code to trace here # Tracer.off # # You can also pass a block: # # Tracer.on { # # trace everything in this block # } def Tracer.on if block_given? Single.on{yield} else Single.on end end ## # Disable tracing def Tracer.off Single.off end ## # Register an event handler <code>p</code> which is called every time a line # in +file_name+ is executed. # # Example: # # Tracer.set_get_line_procs("example.rb", lambda { \|line\| # puts "line number executed is #{line}" # }) def Tracer.set_get_line_procs(file_name, p = nil, &b) p \|\|= b Single.set_get_line_procs(file_name, p) end ## # Used to filter unwanted trace output # # Example which only outputs lines of code executed within the Kernel class: # # Tracer.add_filter do \|event, file, line, id, binding, klass, rest\| # "Kernel" == klass.to_s # end def Tracer.add_filter(p = nil, &b) p \|\|= b Single.add_filter(p) end end # :stopdoc: SCRIPT_LINES__ = {} unless defined? SCRIPT_LINES__ if $0 == __FILE__ # direct call $0 = ARGV[0] ARGV.shift Tracer.on require $0 else # call Tracer.on only if required by -r command-line option count = caller.count {\|bt\| %r%/rubygems/core_ext/kernel_require\.rb:% !~ bt} if (defined?(Gem) and count == 0) or (!defined?(Gem) and count <= 1) Tracer.on end end # :startdoc: Back

Edit File : tracer.rb | Size : 6.48 KB

# frozen_string_literal: false
#--
# $Release Version: 0.3$
# $Revision: 1.12 $

##
# Outputs a source level execution trace of a Ruby program.
#
# It does this by registering an event handler with Kernel#set_trace_func for
# processing incoming events.  It also provides methods for filtering unwanted
# trace output (see Tracer.add_filter, Tracer.on, and Tracer.off).
#
# == Example
#
# Consider the following Ruby script
#
#   class A
#     def square(a)
#       return a*a
#     end
#   end
#
#   a = A.new
#   a.square(5)
#
# Running the above script using <code>ruby -r tracer example.rb</code> will
# output the following trace to STDOUT (Note you can also explicitly
# <code>require 'tracer'</code>)
#
#   #0:<internal:lib/rubygems/custom_require>:38:Kernel:<: -
#   #0:example.rb:3::-: class A
#   #0:example.rb:3::C: class A
#   #0:example.rb:4::-:   def square(a)
#   #0:example.rb:7::E: end
#   #0:example.rb:9::-: a = A.new
#   #0:example.rb:10::-: a.square(5)
#   #0:example.rb:4:A:>:   def square(a)
#   #0:example.rb:5:A:-:     return a*a
#   #0:example.rb:6:A:<:   end
#    |  |         | |  |
#    |  |         | |   ---------------------+ event
#    |  |         |  ------------------------+ class
#    |  |          --------------------------+ line
#    |   ------------------------------------+ filename
#     ---------------------------------------+ thread
#
# Symbol table used for displaying incoming events:
#
# +}+:: call a C-language routine
# +{+:: return from a C-language routine
# +>+:: call a Ruby method
# +C+:: start a class or module definition
# +E+:: finish a class or module definition
# +-+:: execute code on a new line
# +^+:: raise an exception
# +<+:: return from a Ruby method
#
# == Copyright
#
# by Keiju ISHITSUKA(keiju@ishitsuka.com)
#
class Tracer

class << self
    # display additional debug information (defaults to false)
    attr_accessor :verbose
    alias verbose? verbose

# output stream used to output trace (defaults to STDOUT)
    attr_accessor :stdout

# mutex lock used by tracer for displaying trace output
    attr_reader :stdout_mutex

# display process id in trace output (defaults to false)
    attr_accessor :display_process_id
    alias display_process_id? display_process_id

# display thread id in trace output (defaults to true)
    attr_accessor :display_thread_id
    alias display_thread_id? display_thread_id

# display C-routine calls in trace output (defaults to false)
    attr_accessor :display_c_call
    alias display_c_call? display_c_call
  end

Tracer::stdout = STDOUT
  Tracer::verbose = false
  Tracer::display_process_id = false
  Tracer::display_thread_id = true
  Tracer::display_c_call = false

@stdout_mutex = Thread::Mutex.new

# Symbol table used for displaying trace information
  EVENT_SYMBOL = {
    "line" => "-",
    "call" => ">",
    "return" => "<",
    "class" => "C",
    "end" => "E",
    "raise" => "^",
    "c-call" => "}",
    "c-return" => "{",
    "unknown" => "?"
  }

def initialize # :nodoc:
    @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

def stdout # :nodoc:
    Tracer.stdout
  end

def on # :nodoc:
    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

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

def add_filter(p = nil, &b) # :nodoc:
    p ||= b
    @filters.push p
  end

def set_get_line_procs(file, p = nil, &b) # :nodoc:
    p ||= b
    @get_line_procs[file] = p
  end

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

unless list = SCRIPT_LINES__[file]
      list = File.readlines(file) rescue []
      SCRIPT_LINES__[file] = list
    end

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

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

def trace_func(event, file, line, id, binding, klass, *) # :nodoc:
    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
        stdout.printf("%s:%d:%s:%s: %s",
               file,
               line,
               klass || '',
               EVENT_SYMBOL[event],
               source)
      end
    end

end

# Reference to singleton instance of Tracer
  Single = new

##
  # Start tracing
  #
  # === Example
  #
  #   Tracer.on
  #   # code to trace here
  #   Tracer.off
  #
  # You can also pass a block:
  #
  #   Tracer.on {
  #     # trace everything in this block
  #   }

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

##
  # Disable tracing

def Tracer.off
    Single.off
  end

##
  # Register an event handler <code>p</code> which is called every time a line
  # in +file_name+ is executed.
  #
  # Example:
  #
  #   Tracer.set_get_line_procs("example.rb", lambda { |line|
  #     puts "line number executed is #{line}"
  #   })

def Tracer.set_get_line_procs(file_name, p = nil, &b)
    p ||= b
    Single.set_get_line_procs(file_name, p)
  end

##
  # Used to filter unwanted trace output
  #
  # Example which only outputs lines of code executed within the Kernel class:
  #
  #   Tracer.add_filter do |event, file, line, id, binding, klass, *rest|
  #     "Kernel" == klass.to_s
  #   end

def Tracer.add_filter(p = nil, &b)
    p ||= b
    Single.add_filter(p)
  end
end

# :stopdoc:
SCRIPT_LINES__ = {} unless defined? SCRIPT_LINES__

if $0 == __FILE__
  # direct call

$0 = ARGV[0]
  ARGV.shift
  Tracer.on
  require $0
else
  # call Tracer.on only if required by -r command-line option
  count = caller.count {|bt| %r%/rubygems/core_ext/kernel_require\.rb:% !~ bt}
  if (defined?(Gem) and count == 0) or
     (!defined?(Gem) and count <= 1)
    Tracer.on
  end
end
# :startdoc:

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