[PATCH] D39308: [libcxx] Keep track of heap allocated regex states

[Tim Shen via Phabricator via cfe-commits]

timshen created this revision.
Herald added a subscriber: sanjoy.
Herald added a reviewer: EricWF.

Build abstraction on regex's allocation

This fixes a fuzzer crasher from a huge input (provided by Marshall), which seems to be a stackoverflow during destruction. However, I can't reproduce Marshall's crasher even before the change.

No new tests are added, but all old tests pass. I didn't really run valgrind on tests to check for memory leak, as the new allocation is basically correct by construction (only one call site uses `new`, no explicit `delete` calls).


https://reviews.llvm.org/D39308

Files:
  libcxx/include/regex

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