[libcxx-commits] [PATCH] D129842: [libcxxabi] Fix alignment of pointers returned by fallback_malloc

[Simon Tatham via Phabricator via libcxx-commits]

simon_tatham created this revision.
simon_tatham added reviewers: EricWF, compnerd, jroelofs, joerg, miyuki, ldionne.
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This aligns the ``heap[]`` array in ``fallback_malloc.cpp`` to ensure
that it can be safely cast to ``heap_node*``, and also adjusts the
allocation algorithm to ensure that every allocated block has the
alignment requested by ``__attribute__((aligned))``, by putting the
block's ``heap_node`` header 4 bytes before an aligned address.

Patch originally by Eric Fiselier: this is an updated version of
D12669 <https://reviews.llvm.org/D12669>, which was never landed.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D129842

Files:
  libcxxabi/src/fallback_malloc.cpp
  libcxxabi/test/test_fallback_malloc.pass.cpp

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