Earlier this week there was the news of Intel contributing their OpenMP Runtime to LLVM
in order to advance the open-source compiler project. Now to end off the week is news that Apple, who continues to invest significantly into LLVM and employs many of the key contributors, has open-sourced their stack unwinder for the project.
While most platforms provide a system unwinder for stacks, Apple is contributing to LLVM their unwinder implementation developed for OS X and iOS. This work will go into the libcxxabi project to make it easier to port Clang C++ compiler support to new platforms. For those unfamiliar with stack unwinding, see the information available on lubunwind's man page
Apple's unwind code uses the same low-level APIs for the unwind functions but do not share code with the old libunwind. Apple pushed their unwinder code into the LLVM libcxxabi sub-project and is under the LLVM and MIT licenses.
More information on LLVM's new unwinder can be found by this LLVM.org blog post
, the libcxxabi project page
, and the Git commit
adding the unwinder.