BumpPtrAllocator: do the size check without moving any pointers
authorHans Wennborg <hans@hanshq.net>
Sun, 7 Sep 2014 04:24:31 +0000 (04:24 +0000)
committerHans Wennborg <hans@hanshq.net>
Sun, 7 Sep 2014 04:24:31 +0000 (04:24 +0000)
Instead of aligning and moving the CurPtr forward, and then comparing
with End, simply calculate how much space is needed, and compare that
to how much is available.

Hopefully this avoids any doubts about comparing addresses possibly
derived from past the end of the slab array, overflowing, etc.

Also add a test where aligning CurPtr would move it past End.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217330 91177308-0d34-0410-b5e6-96231b3b80d8


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