llvm dev - Mar 2017 - Modifying Address Sanitizer

Hello

I am willing to make changes in Address Sanitizer for experimentation. But
as I am a naive user I am confused with the fact that if I make changes to
Address Sanitizer do I have to rebuild the whole LLVM.

Could somebody please help me figure out a way in which I can make changes
to address sanitizer and do not have to compile the whole LLVM.

Aayushi Agrawal
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> On Mar 9, 2017, at 9:25 PM, Aayushi Agrawal via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> Hello
> 
> I am willing to make changes in Address Sanitizer for experimentation. But
as I am a naive user I am confused with the fact that if I make changes to
Address Sanitizer do I have to rebuild the whole LLVM.
> 
> Could somebody please help me figure out a way in which I can make changes
to address sanitizer and do not have to compile the whole LLVM.
It depends what kind of changes your doing and what kind of test you need to
perform I guess.
AFAIK, ASAN is split between a transformation in LLVM and a runtime in
compiler-rt.
Ultimately I expect that if you already have a build, and you need to rebuild
the runtime or clang after changing something in the code, the incremental build
should be “fast” (few seconds to a few tens of seconds).

— 
Mehdi

Thank you for the response.

Suppose I want to make changes in the LLVM part of Address Sanitizer.
Is there still a way to test the changes made to address sanitizer as a
standalone.

Also can a pass be run after Address Sanitizer Pass is ran, where I can
access the variables created by address sanitizer [LLVM Code] so that I
avoid making changes directly to the address sanitizer?


On Fri, Mar 10, 2017 at 12:55 AM, Mehdi Amini <mehdi.amini at apple.com>
wrote:
>
> > On Mar 9, 2017, at 9:25 PM, Aayushi Agrawal via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
> >
> > Hello
> >
> > I am willing to make changes in Address Sanitizer for experimentation.
> But as I am a naive user I am confused with the fact that if I make changes
> to Address Sanitizer do I have to rebuild the whole LLVM.
> >
> > Could somebody please help me figure out a way in which I can make
> changes to address sanitizer and do not have to compile the whole LLVM.
>
> It depends what kind of changes your doing and what kind of test you need
> to perform I guess.
> AFAIK, ASAN is split between a transformation in LLVM and a runtime in
> compiler-rt.
> Ultimately I expect that if you already have a build, and you need to
> rebuild the runtime or clang after changing something in the code, the
> incremental build should be “fast” (few seconds to a few tens of seconds).
>
> —
> Mehdi
>
>

-- 
Aayushi Agrawal
B.Tech(Final Year)
Computer Science Engineering Undergraduate
LNMIIT,JAIPUR
Contact - 09649357639
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