Stack backtraces in exceptions not supported

[llvmbot]

Bugzilla Link	1982
Resolution	FIXED
Resolved on	May 04, 2012 06:47
Version	trunk
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@asl,@jayfoad

Extended Description

The Ada -E binder option stores a stack traceback in the exception.
This doesn't work with llvm-gcc. Testcase:

procedure Trace is
begin
raise Program_Error;
end;

$ gnatmake trace.adb -bargs -E
gcc -c trace.adb
gnatbind -aO./ -E -I- -x trace.ali
gnatlink trace.ali
$ ./trace
Segmentation fault (core dumped)

[asl]

How such stuff is represented in terms of gcc builtins / llvm IR ?

[llvmbot]

A quick glance shows it using:

__builtin_frame_address
_Unwind_Backtrace
_Unwind_GetIP

[jayfoad]

This doesn't work with llvm-gcc.

Does it work with dragonegg?

[llvmbot]

This works with dragonegg.

[jayfoad]

Cool!

[llvmbot]

mentioned in issue llvm/llvm-bugzilla-archive#2826