tree dd4017563c66739cda8b242202071bbf06000ddf
parent bae79e98918c4e894641b94aa8d2597b4bf3f286
author Louis Dionne <ldionne@apple.com> 1605212073 -0500
committer Copybara-Service <copybara-worker@google.com> 1606730301 -0800

[libc++] Factor out common logic for calling aligned allocation

There were a couple of places where we needed to call the underlying
platform's aligned allocation/deallocation function. Instead of having
the same logic all over the place, extract the logic into a pair of
helper functions __libcpp_aligned_alloc and __libcpp_aligned_free.

The code in libcxxabi/src/fallback_malloc.cpp looks like it could be
simplified after this change -- I purposefully did not simplify it
further to keep this change as straightforward as possible, since it
is touching very important parts of the library.

Also, the changes in libcxx/src/new.cpp and libcxxabi/src/stdlib_new_delete.cpp
are basically the same -- I just kept both source files in sync.

The underlying reason for this refactoring is to make it easier to support
platforms that provide aligned allocation through C11's aligned_alloc
function instead of posix_memalign. After this change, we'll only have
to add support for that in a single place.

Differential Revision: https://reviews.llvm.org/D91379

GitOrigin-RevId: a78aaa1ad51214b2e04f41762e76bb43067ea1fd