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# tracer.rb -
# $Release Version: 0.3$
# $Revision: 1.12 $
# by Keiju ISHITSUKA(keiju@ishitsuka.com)
#
# --
#
#
#
require "thread"
#
# tracer main class
#
class Tracer
class << self
attr_accessor :verbose
alias verbose? verbose
attr_accessor :stdout
attr_reader :stdout_mutex
# display process id?
attr_accessor :display_process_id
alias display_process_id? display_process_id
# display thread id?
attr_accessor :display_thread_id
alias display_thread_id? display_thread_id
# display builtin method call?
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 = Mutex.new
EVENT_SYMBOL = {
"line" => "-",
"call" => ">",
"return" => "<",
"class" => "C",
"end" => "E",
"raise" => "^",
"c-call" => "}",
"c-return" => "{",
"unknown" => "?"
}
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
def stdout
Tracer.stdout
end
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
def off
set_trace_func nil
stdout.print "Trace off\n" if Tracer.verbose?
end
def add_filter(p = proc)
@filters.push p
end
def set_get_line_procs(file, p = proc)
@get_line_procs[file] = p
end
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
def get_thread_no
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, *)
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
Single = new
def Tracer.on
if block_given?
Single.on{yield}
else
Single.on
end
end
def Tracer.off
Single.off
end
def Tracer.set_get_line_procs(file_name, p = proc)
Single.set_get_line_procs(file_name, p)
end
def Tracer.add_filter(p = proc)
Single.add_filter(p)
end
end
SCRIPT_LINES__ = {} unless defined? SCRIPT_LINES__
if $0 == __FILE__
# direct call
$0 = ARGV[0]
ARGV.shift
Tracer.on
require $0
elsif caller.size <= 1
Tracer.on
end
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