On Tue, 2005-03-15 at 09:59, Clifford Wolf wrote: > Hi, > > On Sun, Mar 13, 2005 at 03:01:00PM +0200, Kai Henningsen wrote: > > Most of the rest of the error handling in this project is concerned with > > the absence of the feature I loved in the IBM PL/I compilers under the > > name "SNAP;" - putting out a stack backtrace (the usual idiom for abort() > > was "SNAP; STOP;" IIRC). Now *that* would be a useful feature to have. > > It is there: __builtin_return_address(n) > > I have a small example of how to use that on my homepage: > > http://www.clifford.at/cfun/elfstuff/backtrace.c > > This example is using the ELF dladdr() function - so it can only resolve > symbols in a .so file - not in the main program. (I think it works if the > main program is compiled with -rdynamic - but I didn't check that). > > I hope that helps.
I doubt it will, because most platforms don't support __builtin_return_address(n) for any value of n other than 0. On modern machines it's generally impossible to unwind the stack frame without comprehensive unwind tables. R.
