[llvm-commits] [llvm] r152753 - in /llvm/trunk/lib/Transforms/Instrumentation: AddressSanitizer.cpp CMakeLists.txt FunctionBlackList.cpp FunctionBlackList.h

Chandler Carruth chandlerc at google.com
Wed Mar 14 16:38:50 PDT 2012

On Wed, Mar 14, 2012 at 4:22 PM, Kostya Serebryany <kcc at google.com> wrote:

> [asan] rename class BlackList to FunctionBlackList and move it into a
> separate file -- we will need the same functionality in ThreadSanitizer

If you are going to be hacking on this, I would like to propose a
significant cleanup to its design. This is especially relevant as it moves
to be a more general feature.

We already have the ability to mark specific functions as ignored via a
function attribute. We should be using that and only that mechanism inside
of LLVM.

I think the way to support the blacklist file is to do it in the frontend
(Clang in this case), where it loads the file, and applies the
attribute(s?) to the matching functions while emitting LLVM IR. This has
several advantages in my might, let me know what you think about them:

1) It separates concerns. LLVM now can be tested without inputs other than
the IR.
2) The frontend is already in the business of finding random files on the
users' machines which are not directly related to the source file.
3) The frontend is already in the business of exposing user-visible flags.
4) The frontend knows the un-mangled names of functions, making the syntax
of the file (potentially) simpler.

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