[PATCH] D45762: [LibFuzzer] Add support for an optional user defined callback (`LLVMFuzzerOnExitHandler()`)

[Dan Liew via Phabricator via llvm-commits]

delcypher created this revision.
delcypher added reviewers: kcc, george.karpenkov, kubamracek.
Herald added a subscriber: Sanitizers.

[LibFuzzer] Add support for an optional user defined callback (`LLVMFuzzerOnExitHandler()`)
which is called when LibFuzzer exits.

This callback will be called by LibFuzzer when it exits in most
scenarios. It currently doesn't call the callback if:

- LibFuzzer is launched incorrectly.
- LibFuzzer observes that the client corrupts the fuzzing input.

This upstreams a change from the JFS solver's fork of LibFuzzer.  JFS's use
case is to ensure that an event log gets flushed to disk whenever
LibFuzzer decides that it wants to exit. There are probably other use
cases too.


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D45762

Files:
  lib/fuzzer/FuzzerDefs.h
  lib/fuzzer/FuzzerDriver.cpp
  lib/fuzzer/FuzzerExtFunctions.def
  lib/fuzzer/FuzzerInterface.h
  lib/fuzzer/FuzzerInternal.h
  lib/fuzzer/FuzzerLoop.cpp
  test/fuzzer/FuzzerOnExitHandlerTest.cpp
  test/fuzzer/fuzzer-on-exit-handler-leaks.test
  test/fuzzer/fuzzer-on-exit-handler.test

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