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[libFuzzer] Add support for Fuchsia OS.

Description

[libFuzzer] Add support for Fuchsia OS.

Summary:
This patch adds the initial support for Fuchsia.

  • LIBFUZZER_FUCHSIA is added as an OS type in FuzzerDefs.h
  • Fuchsia is, by design, not POSIX compliant. However, it does use ELF and supports common POSIX I/O functions. Thus, FuzzerExtFunctions.h and FuzzerIO.h are implemented by extending the header guards in FuzzerExtFunctionsWeak.cpp and FuzzerIOPosix.cpp to include LIBFUZZER_FUCHSIA.
  • The platform-specific portions of FuzzerUtil.h are implemented by FuzzerUtilFuchsia.cpp, which makes use of exception ports, syscalls, and the launchpad library.
  • The experimental equivalence server is not currently supported, so FuzzerShmem.h is implemented by stub methods in FuzzerShmemFuchsia.cpp. Any future implementation will likely involve VMOs.

Tested with ASAN/SanCov on Fuchsia/x86-64 with the canonical toy fuzzer.

Patch By: aarongreen

Reviewers: kcc, morehouse, flowerhack, phosek

Reviewed By: kcc, phosek, Eugene.Zelenko

Subscribers: srhines, mgorny, Eugene.Zelenko

Differential Revision: https://reviews.llvm.org/D40974

Details

Committed
morehouseDec 8 2017, 2:54 PM
Reviewer
kcc
Differential Revision
D40974: [libFuzzer] Add support for Fuchsia OS
Parents
rL320209: [CodeGen] Move printing MO_Immediate operands to MachineOperand::print
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