.Dd November 7, 2008
.Dt unwinddump 1
.Os Darwin
.Sh NAME
.Nm unwinddump
.Nd "Displays compact unwind information in an executable"
.Sh SYNOPSIS
.Nm
.Op Fl arch Ar arch-name 
.Ar file(s)
.Sh DESCRIPTION
When a C++ (or x86_64 Objective-C) exception is thrown, the runtime must unwind
the stack looking for some function to catch the exception.  Traditionally, 
the unwind information is stored in the __TEXT/__eh_frame section of each executable
as Dwarf CFI (call frame information).  Beginning in Mac OS X 10.6, the unwind
information is also encoded in the __TEXT/__unwind_info section using a two-level
lookup table of compact unwind encodings.  
.Pp
The unwinddump tool displays the content of the __TEXT/__unwind_info section.
.Sh SEE ALSO
.Xr ld 1
.Xr dwarfdump 1