Debugging Eper redbug,在消息中打印行号
以下是在shell中使用redbug的一些消息:Debugging Eper redbug,在消息中打印行号,debugging,erlang,trace,Debugging,Erlang,Trace,以下是在shell中使用redbug的一些消息: % 02:49:02 <0.116.0>({cowboy_protocol,init,4}) % func1:start(<<"/second">>, [some]) % 02:49:02 <0.116.0>({cowboy_protocol,init,4}) % func1:looper(<<"/home/second">>, #{data => []}]) %0
% 02:49:02 <0.116.0>({cowboy_protocol,init,4})
% func1:start(<<"/second">>, [some])
% 02:49:02 <0.116.0>({cowboy_protocol,init,4})
% func1:looper(<<"/home/second">>, #{data => []}])
%02:49:02({cowboy_协议,init,4})
%func1:开始(,[some])
%02:49:02({牛仔协议,初始,4})
%func1:looper(,#{data=>[]}])
有没有办法在redbug消息中也打印行号
redbug:help()确实显示了以下内容:
print_fun () custom print handler, fun/1 or fun/2;
fun(TrcMsg) -> <ignored>
fun(TrcMsg,AccOld) -> AccNew
print_fun()自定义打印处理程序,fun/1或fun/2;
乐趣(TrcMsg)->
乐趣(TrcMsg,AccOld)->AccNew
但是没有很好的解释如何使用它,所以我无法尝试查看是否可以在消息中添加行号您似乎无法以任何直接的方式进行操作 最简单的检查方法是,只需打印您在
print\u fun中收到的所有数据即可
1> PrintFun = fun (Msg) -> io:format( ">>> ~p~n" , [Msg]) end.
#Fun<erl_eval.6.90072148>
2> redbug:start("erlang" , [{print_fun, PrintFun}]).
{30,249}
>>> {call,{{erlang,demonitor,[#Ref<0.0.0.40>]},<<>>},
{<0.33.0>,{erlang,apply,2}},
{11,40,31,554200}}
>>> {call,{{erlang,atom_to_list,['PrintFun']},<<>>},
{<0.33.0>,{erlang,apply,2}},
{11,40,31,554210}}
>>> {call,{{erlang,group_leader,[]},<<>>},
{<0.33.0>,{erlang,apply,2}},
{11,40,31,554213}}
>>> {call,{{erlang,monitor,[process,<0.26.0>]},<<>>},
{<0.33.0>,{erlang,apply,2}},
{11,40,31,554215}}
>>> {call,{{erlang,port_control,[#Port<0.491>,101,[]]},<<>>},
{<0.24.0>,user_drv},
{11,40,31,554231}}
>>> {call,{{erlang,module_loaded,[calendar]},<<>>},
{<0.20.0>,code_server},
{11,40,31,554257}}
>>> {call,{{erlang,atom_to_list,[calendar]},<<>>},
{<0.20.0>,code_server},
{11,40,31,554263}}
>>> {call,{{erlang,'++',["calendar",".beam"]},<<>>},
{<0.20.0>,code_server},
{11,40,31,554265}}
>>> {call,{{erlang,'++',["ebin","/calendar.beam"]},<<>>},
{<0.20.0>,code_server},
{11,40,31,554268}}
>>> {call,{{erlang,whereis,[erl_prim_loader]},<<>>},
{<0.20.0>,code_server},
{11,40,31,554270}}
redbug done, msg_count - 10
在那个里你们可以找到列表,你们可以在上面找到元组,比如{function,LineNumber,FunctionName,Arity,FunctionCodeAsList}
。因此,通过浏览此列表并查找您要查找的函数,您可以提取LineNumber
你仍然需要考虑一些可能不起作用的事情
- 您正在分析光盘中的实际文件,所以它必须位于您当前的目录中。它与是否加载到VM以及加载到VM的内容(什么代码版本)无关。因此,您可能需要做一些工作才能真正找到这个
.beam
- 没有调试信息编译的文件可能无法生成此抽象语法树。您需要决定这是否是您的情况,以及您希望如何处理此问题
- 一些
光束
可能被加密,一些可能存在其他问题。你应该通过阅读来感受你正在处理的事情
如果你有什么想法,请分享。快乐的黑客 非常感谢你花了这么多时间来经历这一切。谢谢。我试着调用这个宏:-define(PRINT(Var),io:format(“DEBUG:~p:~p-~p~n~n~p~n~n”,[?MODULE,?LINE,?Var,Var])。从内部打印乐趣,但这并没有真正的工作。当我使用redbug时,我发现我不太需要行号。通过检查函数的参数,可以推断匹配了哪个函数子句。它不像下面的行号那样舒服,但实际上很不错,我喜欢。再次感谢。将标记为已解决
{ok,{redbug,[{abstract_code,{raw_abstract_v1,[{attribute,1,
file,
{"src/redbug.erl",1}},
{attribute,9,module,redbug},
{attribute,11,export,[{help,0}]},
{attribute,13,export,[{unix,1}]},
{attribute,15,export,
[{start,1},{start,2},{start,3},{start,4},{start,5}]},
{attribute,16,export,[{stop,0}]},
{attribute,1,file,{"src/log.hrl",1}},
{function,17,'?log',2,
[{clause,17,[{var,17,...},{var,...}],[[{...}]],[{...}]},
{clause,18,[{var,...},{...}],[],[...]}]},
{attribute,19,file,{"src/redbug.erl",19}},
{attribute,22,record,
{cnf,[{record_field,24,{...},...},
{record_field,25,...},
{record_field,...},
{...}|...]}},
{function,57,help,0,[{clause,57,[],...}]},
{function,123,unix,1,
[{clause,123,...},{clause,...},{...}|...]},
{function,146,to_term,1,[{clause,...},{...}]},
{function,154,maybe_halt,1,[{...}]},
{function,160,is_in_shell,0,[...]},
{function,167,stop,0,...},
{function,174,start,...},
{function,176,...},
{function,...},
{...}|...]}}]}}