Re: Add support to trace comparison instructions and switch statements

["吴潍浠(此彼)" <weixi.wwx@antfin.com>]

Hi all

Is it worth adding my codes to gcc ? Are there some steps I need to do ?
Could somebody tell me the progress ?

Maybe there should be a project like libfuzzer to solve bugs in program.

Wish Wu
------------------------------------------------------------------
From:Wish Wu <weixi.wwx@antfin.com>
Time:2017 Jul 21 (Fri) 13:38
To:gcc <gcc@gcc.gnu.org>; gcc-patches <gcc-patches@gcc.gnu.org>; Jeff Law <law@redhat.com>
Cc:wishwu007 <wishwu007@gmail.com>
Subject:Re: Add support to trace comparison instructions and switch statements


Hi Jeff

I have signed the copyright assignment, and used the name 'Wish Wu' .
Should I send you a copy of my assignment ?

The attachment is my new patch with small changes. 
Codes are checked by ./contrib/check_GNU_style.sh, except some special files.

With

------------------------------------------------------------------
From:Jeff Law <law@redhat.com>
Time:2017 Jul 14 (Fri) 15:37
To:Wish Wu <weixi.wwx@antfin.com>; gcc <gcc@gcc.gnu.org>; gcc-patches <gcc-patches@gcc.gnu.org>
Cc:wishwu007 <wishwu007@gmail.com>
Subject:Re: Add support to trace comparison instructions and switch statements


On 07/10/2017 06:07 AM, 吴潍浠(此彼) wrote:
> Hi
> 
> I write some codes to make gcc support comparison-guided fuzzing.
> It is very like http://clang.llvm.org/docs/SanitizerCoverage.html#tracing-data-flow .
> With -fsanitize-coverage=trace-cmp the compiler will insert extra instrumentation around comparison instructions and switch statements.
> I think it is useful for fuzzing.  :D
> 
> Patch is below, I may supply test cases later.
Before anyone can really look at this code you'll need to get a
copyright assignment on file with the FSF.

See:
https://gcc.gnu.org/contribute.html

If you've already done this, please let me know and I'll confirm with
the FSF copyright clerk.

Jeff