Shulou(Shulou.com)06/02 Report--

In AIX, the xlc compiler has an option-qfunctrace, and programs compiled with this option automatically call the following custom function at the entrance and exit of each function.

Extern "C" void

_ _ func_trace_enter (const char * const proc_name

Const char * const file_name

Const int line_no

Void * * const id)

Extern "C" void

_ _ func_trace_exit (const char * const proc_name

Const char * const file_name

Const int line_no

Void * * const id)

Extern "C" void

_ _ func_trace_catch (const char * const proc_name

Const char * const file_name

Const int line_no

Void * * const id)

Execute _ _ func_trace_enter () before the function call, and _ _ func_trace_exit () after the function returns normally. If the function is thrown through a throw exception, execute _ _ func_trace_catch () where the exception is caught by catch, but encounter catch (...). The capture will not be performed. It is worth noting that if throw is thrown, _ _ func_trace_exit () will not be triggered.

Using this function, you can achieve the effect of performance statistics without modifying the source program. The procedure is as follows.

Tr.cpp is a custom function entry and exit program, which passes through each function when it is executed. Compiled into libfunctr.so.

# include

# include

# include

# include

Using std::vector

Using std::string

Using std::clog

Using std::endl

Extern "C" void print_trace ()

Struct Stat

{

Int lvl

String name

Long stm

Long etm

Long oitv

Stat (int l, const string& s, long st): lvl (l), name (s), stm (st), etm (0), oitv (0) {}

}

Static vector tracev

Static int clvl = 0

Extern "C" void

_ _ func_trace_enter (const char * const proc_name

Const char * const file_name

Const int line_no

Void * * const id)

{

/ / printf ("{% s (% s% d)% p% s\ n", proc_name, file_name, line_no, id [0], (char*) * id)

Struct timeval nowtm

Gettimeofday (& nowtm, NULL)

+ + clvl

Tracev.push_back (Stat (clvl, string (proc_name) + "():" + file_name, nowtm.tv_sec * 1000000 + nowtm.tv_usec))

}

Extern "C" void

_ _ func_trace_exit (const char * const proc_name

Const char * const file_name

Const int line_no

Void * * const id)

{

/ / printf ("}% s (% SVA% d)% p% s\ n", proc_name, file_name, line_no, id [0], (char*) * id)

Struct timeval nowtm

Int itv

Gettimeofday (& nowtm, NULL)

Auto iter = tracev.end ()-1

While (iter- > etm! = 0)

-- iter

Iter- > etm = nowtm.tv_sec * 1000000 + nowtm.tv_usec

Itv = iter- > etm-iter- > stm-iter- > oitv

For (auto s = tracev.begin (); swords tracev.end (); slots +)

{

If (s-> etm = = 0)

S-> oitv + = itv

}

-- clvl

If (clvl = = 0)

Print_trace ()

}

Extern "C" void print_trace ()

{

Time_t t

Char buf [30]

For (auto s = tracev.begin (); swords tracev.end (); slots +)

{

Clog

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