trace.c

   1 #include <stdio.h>
   2 #include <time.h>
   3
   4 /* See: http://balau82.wordpress.com/2010/10/06/trace-and-profile-function-calls-with-gcc/ */
   5
   6 # ifdef __cplusplus
   7 extern "C" {
   8 # endif
   9
  10 static FILE *fp_trace;
  11
  12 void __attribute__ ((constructor)) trace_begin (void) __attribute__ ((no_instrument_function));
  13 void __attribute__ ((destructor)) trace_end (void) __attribute__ ((no_instrument_function));
  14 void __cyg_profile_func_enter( void *, void * ) __attribute__ ((no_instrument_function));
  15 void __cyg_profile_func_exit( void *, void * ) __attribute__ ((no_instrument_function));
  16
  17
  18 void __attribute__ ((constructor)) trace_begin (void)
  19 {
  20   fp_trace = fopen("trace.out", "w");
  21 }
  22
  23 void __attribute__ ((destructor)) trace_end (void)
  24 {
  25   if(fp_trace != NULL) {
  26     fclose(fp_trace);
  27   }
  28 }
  29
  30 void __cyg_profile_func_enter (void *func,  void *caller)
  31 {
  32   if(fp_trace != NULL) {
  33     fprintf(fp_trace, "e %p %p %lu\n", func, caller, time(NULL) );
  34   }
  35 }
  36
  37 void __cyg_profile_func_exit (void *func, void *caller)
  38 {
  39   if(fp_trace != NULL) {
  40     fprintf(fp_trace, "x %p %p %lu\n", func, caller, time(NULL));
  41   }
  42 }
  43
  44 # ifdef __cplusplus
  45 }
  46 # endif
  47