[PATCH] Add clang-fuzzer target

[Aaron Ballman]

I've made a fix in r234170 that gates the build of clang-fuzzer on the
build of LLVMFuzzer. There may be a more appropriate fix, but this
should at least get the bots to green again.

~Aaron

On Mon, Apr 6, 2015 at 12:07 PM, Aaron Ballman <aaron at aaronballman.com> wrote:
> This appears to have broken the build for Windows.
>
> http://bb.pgr.jp/builders/msbuild-llvmclang-x64-msc18-DA/builds/116/steps/build_clang_all/logs/stdio
>
> I am seeing this breakage locally as well. It seems that the
> LLVMFuzzer library is not being built (possibly because of
> LLVM_USE_SANITIZE_COVERAGE not being true?), and so clang-fuzzer gets
> link failures.
>
> ~Aaron
>
> On Thu, Jan 29, 2015 at 10:33 PM, Kostya Serebryany <kcc at google.com> wrote:
>> Hi chandlerc,
>>
>> Add clang-fuzzer target.
>> This is a very naive and slow clang fuzzer, but it has found
>> one new bug (PR22396) and hit a known bug (PR21954) in just a few minutes,
>> so I think it deserves to be committed.
>> I would appreciate further contribution to fuzzer/ClangFuzzer.cpp
>> to make if faster and more meaningful.
>>
>> http://reviews.llvm.org/D7289
>>
>> Files:
>>   CMakeLists.txt
>>   fuzzer/
>>   fuzzer/CMakeLists.txt
>>   fuzzer/ClangFuzzer.cpp
>>
>> Index: CMakeLists.txt
>> ===================================================================
>> --- CMakeLists.txt
>> +++ CMakeLists.txt
>> @@ -532,3 +532,7 @@
>>      ${CLANG_BINARY_DIR}/share/clang/cmake/ClangConfig.cmake
>>      COPYONLY)
>>  endif ()
>> +
>> +if( LLVM_USE_SANITIZE_COVERAGE )
>> +  add_subdirectory(fuzzer)
>> +endif()
>> Index: fuzzer/CMakeLists.txt
>> ===================================================================
>> --- /dev/null
>> +++ fuzzer/CMakeLists.txt
>> @@ -0,0 +1,17 @@
>> +set(LLVM_LINK_COMPONENTS support)
>> +
>> +add_clang_executable(clang-fuzzer
>> +  ClangFuzzer.cpp
>> +  )
>> +
>> +target_link_libraries(clang-fuzzer
>> +  clangAST
>> +  clangASTMatchers
>> +  clangBasic
>> +  clangFrontend
>> +  clangLex
>> +  clangRewrite
>> +  clangTooling
>> +  clangToolingCore
>> +  LLVMFuzzer
>> +  )
>> Index: fuzzer/ClangFuzzer.cpp
>> ===================================================================
>> --- /dev/null
>> +++ fuzzer/ClangFuzzer.cpp
>> @@ -0,0 +1,34 @@
>> +//===-- ClangFuzzer.cpp - Fuzz Clang --------------------------------------===//
>> +//
>> +//                     The LLVM Compiler Infrastructure
>> +//
>> +// This file is distributed under the University of Illinois Open Source
>> +// License. See LICENSE.TXT for details.
>> +//
>> +//===----------------------------------------------------------------------===//
>> +///
>> +/// \file
>> +/// \brief This file implements a function that runs Clang on a single
>> +///  input. This function is then linked into the Fuzzer library.
>> +///  See llvm/lib/Fuzzer/README.txt for more instructions.
>> +///
>> +//===----------------------------------------------------------------------===//
>> +
>> +#include <stdio.h>
>> +#include <stddef.h>
>> +#include <stdint.h>
>> +
>> +#include "clang/Tooling/Tooling.h"
>> +#include <string>
>> +
>> +// FIXME: The current implementation is very naive an inefficient:
>> +// - buildASTFromCode does a lot of driver work which slows down things.
>> +// - Errors are reported to stderr slowing things even further.
>> +//
>> +// What we really need here is a function that takes the array of bytes
>> +// and invokes preprocessor and/or parser on it, sending messages to dev/null.
>> +
>> +extern "C" void TestOneInput(uint8_t *data, size_t size) {
>> +  std::string S((char*)data, size);
>> +  clang::tooling::buildASTFromCode(S);
>> +}
>>
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>>
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