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[scudo] Lay the foundation for 32-bit support
Summary: In order to support 32-bit platforms, we have to make some adjustments in multiple locations, one of them being the Scudo chunk header. For it to fit on 64 bits (as a reminder, on x64 it's 128 bits), I had to crunch the space taken by some of the fields. In order to keep the offset field small, the secondary allocator was changed to accomodate aligned allocations for larger alignments, hence making the offset constant for chunks serviced by it. The resulting header candidate has been added, and further modifications to allow 32-bit support will follow. Another notable change is the addition of MaybeStartBackgroudThread() to allow release of the memory to the OS. Reviewers: kcc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D25688 llvm-svn: 285209
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Kostya Kortchinsky
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Oct 26, 2016
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