Re: How to handle a NullPointerException

[Andrew Haley <aph at redhat dot com>]

Dimiter Stamenov wrote:
>  >Dimiter Stamenov wrote:
>  >>  >Do simple programs work?
>  >> 
>  >> Hi Andrew, yes, all other programs I have compiled work fine, except this.  
>  >> It is supposed just to take the text from a MS Word file, but until that 
>  >> moment I have not succeed to do that with gcj compiled version...
>  >
>  >We'll have to take this in stages.  Can you usually get a backtrace out of gdb?
>  >
>  >If not, we might have to try `-finstrument-functions'.  You'll find

> Thanks, `-finstrument-functions' seems very useful option. I have read the documentation but could not realize how to define __cyg_profile_func_enter and __cyg_profile_func_exit? 

__cyg_profile_func_enter() is just a C function that takes two void* args

void __cyg_profile_func_enter( void *this, void *callsite )

Define it and link with your program.

Do *not* compile this C code with `-finstrument-functions'.

Andrew.


void __cyg_profile_func_enter( void *this, void *callsite )
{
  /* Function Entry Address */
  fprintf(fp, "E%p\n", (int *)this);
}


void __cyg_profile_func_exit( void *this, void *callsite )
{
  /* Function Exit Address */
  fprintf(fp, "X%p\n", (int *)this);
}