[Libunwind-devel] How to get a backtrace from saved frame pointer

[Roman Tsisyk]

Hi!

My application uses lightweight user-space threads (fibers a.k.a coroutines). 
Each fiber has its own stack and a saved frame pointer to the last executed 
function, retrieved from `__builtin_frame_address(0)`. I want to create 
backtraces for all fibers using saved frame pointers. 

Currently this feature is implemented using libbfd[1], which is non-portable 
and just terrible. I want to switch to libunwind, but I don't understand how to 
wrap unw_create_addr_space()/unw_init_remote() for my case. Could you please 
provide some examples?

[1]: 
https://github.com/tarantool/tarantool/blob/3379dbcc04e048a5dd1a61b5fa7caacb66598120/src/backtrace.cc#L294-L329

-- 
WBR,
   Roman Tsisyk <address@hidden>
   http://tarantool.org/ - an efficient in-memory data store and a Lua 
application server