llvm/CMakeLists.txt at d400714375f079776e9553ce5be08c1d54b8548c - llvm - Gitea: Git with a cup of tea

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Karl Schimpf 1318d71a75 Build a lib/Fuzzer version for llvm-as.

Summary:
This CL is associated with a fuzzing effort to find bugs in LLVM. The
first step is to fuzz llvm-as to find potential issues in generating
IR. Both afl-fuzz and LLVM's lib/Fuzzer are being used.

This CL introduces the executable that implements the in-process
fuzzer using LLVM's lib/Fuzzer. The motivation for using lib/Fuzzer is
based on time comparisons between afl-fuzz and lib/Fuzzer. Early
results show that per-process, the lib/Fuzzer implemenation of llvm-as
(i.e. this CL) generates over 30 times the number of mutations found
by afl-fuzz, per hour runtime. The speedup is due to the removal of
overhead of forking a process, and loading the executable into memory.

I placed this under the tools directory, since it is an executable. It
is also only conditionally built if (using cmake) the flag
LLVM_USEE_SANITIZE_COVERAGE is used, so that it isn't built by
default.

Reviewers: kcc, filcab

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D12438

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@246458 91177308-0d34-0410-b5e6-96231b3b80d8

2015-08-31 17:55:32 +00:00

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CMake

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 if( LLVM_USE_SANITIZE_COVERAGE )
   set(LLVM_LINK_COMPONENTS
       AsmParser
       BitWriter
       Core
       Support
       )
   add_llvm_tool(llvm-as-fuzzer
                 llvm-as-fuzzer.cpp)
   target_link_libraries(llvm-as-fuzzer
                         LLVMFuzzer
                         )
 endif()