mcheck/mtrace for c++

[ahoward <ahoward at fsl dot noaa dot gov>]

all-

By using #include <mcheck.h> and the mtrace() call one can obtain very
usefull diagnostics about dynamic memory usage :

Memory not freed:
-----------------
   Address     Size     Caller
0x08049eb8   0xb0f2  at /home/ahoward/eg/c/leaky.cc:15
0x08060ee8      0x4  at /scratch/gcc-3.0/i686-pc-linux-gnu/libstdc++-v3/libsupc++/new_op.cc:48


however, the second line shows this does not work with c++, since only the
call to malloc from within new is shown.  i'm trying to implement
something similar for c++ and have attempted to use the following code to
register a new_handler, it comipiles fine and runs as well - but the
handler does not get registered (output does not show up).  Any help is
appreciated and apologies all round if this is not an appropriate list to
mail this item to.

source included at bottom and attached.

-a

-- 
 ====================================
 | Ara Howard
 | NOAA Forecast Systems Laboratory
 | Information and Technology Services
 | Data Systems Group
 | R/FST 325 Broadway
 | Boulder, CO 80305-3328
 | Email: ahoward@fsl.noaa.gov
 | Phone:  303-497-7238
 | Fax:    303-497-7259
 ====================================


SOURCE FOLLOWS
=====================================

#include <stdio.h>
#include <stdlib.h>

/* would be <leak_debug.h> */
#ifndef LEAK_DEBUG_H
#define LEAK_DEBUG_H

#include <new>

extern std::new_handler __new_handler;
void my_new_handler(void);

std::new_handler org_handler = (std::new_handler) NULL;
#endif /* #define LEAK_DEBUG_H */


void my_new_handler(void){

    printf("my_new_handler called...\n");
    org_handler();
}


class obj{

public:
    int var;
	obj(void){  printf("obj() called...\n"); }
	~obj(void){ printf("~obj() called...\n"); }
};


int main(int argc, char **argv){

    org_handler = std::set_new_handler(my_new_handler);

    /* just to be sure */
    __new_handler = my_new_handler;

    obj *o = new obj();

    o->var;

    int *a = new int[1];

	return 0;
}

Attachment: new.cc
Description: Text document