Debugging skills-gcc/g ++-instrument-functions Parameters

Reference

Use the finstrument-functions _ attribute _ + graphviz visual function to call the GCC function.

IBM graphviz visualized function call

Gcc/g ++ uses-finstrument-functions to check the call of each function of the Code

Http://www.logix.cz/michal/devel/CygProfiler/cyg-profile.c.xp

Http://gcc.gnu.org/onlinedocs/gcc-4.3.3/gcc/Code-Gen-Options.html#Code-Gen-Options official parameter description

Index

• Introduction
• C
• C ++
• Finstrument-functions-exclude-function-list = test exclusion Function

Because the project is too large, too many threads, and GPROF is not reliableFinstrument-Functions

-Finstrument-FunctionsCall the two hook functions "_ cyg_profile_func_enter" and "_ cyg_profile_func_exit" before each incoming and exiting function. What are the solutions for "inbound" and "exit? C programming language is the most typical practice. Although there is no way to define the actual statement, function call actually exists in the form of a stack frame, last year, I mentioned "dig into Hello World" Part II. Therefore, if we do not pass through the built-in GCC function "_ builtin_return_address" to obtain the Dynamic Address of caller and callee, that can still be passed through-Finstrument-FunctionsLet GCC synthesize related processing commands so that we can catch up with them. When we see the _ Cyg's starting function, we know it's from cygnus's kernel. We can see a lot of it in GCC 2.x.

C

Hello. c

# Include <stdio. h> # Define Dump (func, call) printf ("% s: func = % P, called by = % P/N", _ FUNCTION __, func, call) Void  _ Attribute _ (_ no_instrument_function _) _ cyg_profile_func_enter ( Void * This_func, Void * Call_site) {dump (this_func, call_site );}  Void  _ Attribute _ (_ no_instrument_function _) _ cyg_profile_func_exit (  Void * This_func, Void * Call_site) {dump (this_func, call_site);} Main () {puts (  "  Hello world!  "  );  Return  0  ;} 

Makefile

 
ALL: Hello. O gcc-Finstrument-functions hello. O-O hellohello. O: gcc-Finstrument-functions-C hello. Cclean: Rm*. O hello-RF
 

Run:

 
./Hello _ cyg_profile_func_enter: func=Zero X 8048438, Called by =0x658dec/Nhello world!_ Cyg_profile_func_exit: func=Zero X 8048438, Called by =0x658dec/N
 

 

End

C ++

Hello. CC

# Include <cstdlib> # Include <Cstdlib> # Include <Fstream> # Include <Iomanip> # Include <Iostream> Using   Namespace  STD;  # Define Dump (func, call) printf ("% s: func = % P, called by = % P \ n", _ FUNCTION __, func, call) # Ifdef _ cplusplus  Extern   "  C "  {  # Endif  /*  Static functions.  */  Static File * openlogfile ( Const   Char * Filename) _ attribute _ (no_instrument_function ));  Static   Void Closelogfile ( Void  ) _ Attribute _ (no_instrument_function )); /*  Note that these are linked internally by the compiler. * don't call them directly!  */  Void _ Cyg_profile_func_enter ( Void * This_fn, Void * Call_site) _ attribute _ (no_instrument_function ));  Void _ Cyg_profile_func_exit ( Void * This_fn, Void * Call_site) _ attribute _ (no_instrument_function); # ifdef _ cplusplus }; # Endif  Void  _ Cyg_profile_func_enter (  Void * This_fn, Void * Call_site) {dump (this_fn, call_site );}  Void  _ Cyg_profile_func_exit (  Void * This_fn, Void * Call_site) {dump (this_fn, call_site );}  Int  Main (  Int Argc,Char * Argv []) {cout < "  \ Nprogram  " <Argv [ 0 ] <Endl < Endl;  Return  Exit_success ;}  //  ---------- End of function main ---------- 

Makefile:

 
ALL: G++-Finstrument-functions hello.CC
 

Run:

./ A. Out _ cyg_profile_func_enter: func = 0x801_ AE , Called by = 0x8048a3b  _ Cyg_profile_func_enter: func = Zero X 8048714 , Called by = 0x801_d7  _ Cyg_profile_func_exit: func = Zero X 8048714 , Called by = 0x801_d7  _ Cyg_profile_func_exit: func = 0x801_ AE , Called by =0x8048a3b  _ Cyg_profile_func_enter: func = Zero X 8048882 , Called by = 0x658dec  Program. / A. Out _ cyg_profile_func_exit: func = Zero X 8048882 , Called by = 0x658dec  _ Cyg_profile_func_enter: func = 0x804881a , Called by = 0x66e7f9  _ Cyg_profile_func_exit: func =0x804881a , Called by = 0x66e7f9 

 

 

Hello. c

# Include <stdio. h> # Include  "  Test. h  "  # Define Dump (func, call) printf ("% s: func = % P, called by = % P \ n", _ FUNCTION __, func, call) Void  _ Attribute _ (_ no_instrument_function _) _ cyg_profile_func_enter (  Void * This_func, Void *Call_site) {dump (this_func, call_site );}  Void  _ Attribute _ (_ no_instrument_function _) _ cyg_profile_func_exit (  Void * This_func, Void * Call_site) {dump (this_func, call_site );}  Void  Test () {printf (  "  Nihao \ n  "  );} Main () {test (); puts (  " Hello world!  "  );  Return   0  ;} 

Makefile

 
Cc =Gcc44all: Hello. o $ (cc)-G-finstrument-functions hello. O-O hellohello. O: $ (cc)-G-finstrument-functions-exclude-function-list = test-C hello. Cclean: Rm*. O hello-RF
 

Run:

./Hello _ cyg_profile_func_enter: func=0x804847e, Called by =0xb7e6adecNihaohello world!_ Cyg_profile_func_exit: func=0x804847e, Called by =0xb7e6adec
 

 

End