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-*-Mode: outline-*-
* News for v0.97:
** unw_get_proc_name() may now be called from signal-handler.
** The ptrace-helper routines are now declared in libunwind-ptrace.h.
Applications which use ptrace-based unwinding should include
<libunwind-ptrace.h> to get the _UPT_*() routines declared.
** libunwind has been split into a "local-only" and a "generic" versions.
The former is optimized for local unwinding (within a process) and
is called libunwind.so (shared version) or libunwind.a (archive
version). The generic version is not limited to unwinding within a
process and is called libunwind-generic.so (shared version)
libunwind-generic.a (archive version). Similarly, the ptrace()
support has been separated out into a convenience library called
libunwind-ptrace.a. For the most part, backwards-compatibility
is retained. However, when building an application which uses
libunwind, it may be necessary to change the linker command-line
as shown in the table below:
Application which does: Before v0.97: With v0.97:
----------------------- ------------- -----------
local unwinding only: -lunwind -lunwind
remote unwinding: -lunwind -lunwind-generic
cross unwinding: -lunwind-PLAT -lunwind-PLAT
ptrace-based unwinding: -lunwind -lunwind-ptrace -lunwind-generic
The motivation for this splitting is to keep libunwind.so as minimal
as possible. This library will eventually be loaded by most (if not
all) executables and hence it is important to ensure that it can
be loaded as quickly as possible.
** unw_getcontext() tuned on IA-64.
The unw_getcontext() routine used to be provided by (GNU) libc
(getcontext()). This caused unnecessary overhead (e.g., an
unnecessary system-call to sigprocmask()). The new
unw_getcontext() only does the work really needed for libunwind and
hence performs much better. However, this change implies that
programs linked against libunwind v0.97 won't be
backwards-compatible with earlier versions (there would be an
unresolved symbol for _Uia64_getcontext()).
** Fix NaT-bit handling on IA-64.
New test-cases have been added to test the handling of the NaT bit
(and floating-point NaT values) and all discovered/known bugs have
been fixed.
** Initial DWARF-based unwinder for x86.
There is a beginning for a DWARF-based unwinder for x86. Work for
x86-64-support based on this DWARF unwinder is currently underway
at IBM and it is expected that this support will be merged into the
official tree soon.
* News for v0.96:
** _Unwind_*() routines defined by the C++ ABI are now included in
libunwind.
* News for v0.95:
** Bigger, better, faster, or so the theory goes.
* News for v0.93:
** More bug-fixes & improved HP-UX support.
* News for v0.92:
** Bug-fix release. IA-64 unwinder can now be built with Intel compiler (ECC).
* News for v0.91:
** Lots of documentation updates
** Some portability fixes.
* News for v0.9:
** The libunwind API is mostly feature-complete at this point (hence the
version jump from v0.2 to v0.9).
* News for v0.2:
** Automated configuration/build with autoconf and automake.
** Added support for building libunwind as a shared library.
** Added support for remote unwinding.
** Added support for cross-building.
** Added two new routines to the API:
- unw_is_fpreg()
- unw_get_save_loc()
** Added multi-architecture supports (lets a single application use
the unwind libraries for multiple target architectures; this is useful,
e.g., useful for building a debugger that can support multiple targets
such as x86, ia64, etc.)
* News for v0.1:
** Added support for exception handling.
* News for v0.0:
** It's a brand new package.
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