Coded breakpoints

[Francois Gouget]

On Thu, 25 Jul 2002, Max wrote:

> Maybe it's a stupid question, but... is there a way to hard-code a
> breakpoint ? I need to check a bit of code that gets called too many times and
> I'd like to put a conditional breakpoints compiled in code; no way to use
> winedbg built-in conditional breaks, the condition is too complicated.....

You can do:

  if (complex condition) {
      _CrtDbgBreak();
  }

Or equivalently:
  if (complex condition) {
      __asm__ ("\tint $0x3\n");
  }

The int 3 is a software breakpoint (or rather, a software breakpoint is
an int 3). The bove code will cause you to drop in the debugger if the
int 3 ever gets executed. This only works on x86 architectures but this
is probably all you need.


--
Francois Gouget         fgouget at free.fr        http://fgouget.free.fr/
 Advice is what we ask for when we already know the answer but wish we didn't
                                 -- Eric Jong