[lug] C++ question: Stack info at runtime?

[D. Stimits]

"Scott A. Herod" wrote:
> 
> Hello,
> 
> Java's got a nice method for getting the stack trace at runtime.
> I use it often for debugging as an "assert" mechanism.  Is there
> something similar that I can do with C++?
> 
> Thanks,
> 
> Scott
> _______________________________________________
> Web Page:  http://lug.boulder.co.us
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There is if you use -rdynamic and -g. Incidentally, this may cause
normal core dumps to provide less or different info. Here is a basic
sample of a stack frame print function, which is probably specific to
linux:

#include <iostream>
#include <execinfo.h>

void show_stackframe()
{
	void* trace[ 64 ];
	char** messages = NULL;
	int trace_size = 0;
	
	cerr << "Begin Stack Frame Dump" << endl;
	cerr << "(if useful symbols are not found, try recompiling "
		<< "with -rdynamic during link, and -g without -O#)"
		<< endl;
	trace_size = backtrace( trace, 64 );
	messages = backtrace_symbols( trace, trace_size );
	for( int i = 0; i < trace_size; ++i ) {
		cerr << "Traced: " << messages[i] << endl;
	}
	cerr << "End Stack Frame Dump" << endl;
}


I've used this at times to debug asyncronous code and figure out what
had been called from where, I actually keep a commented out version in
my game code.

D. Stimits, stimits at idcomm.com