[patch/asan] Use lvm.global_ctors instead of symbol name matching to find constructors

[Kostya Serebryany]

This is https://code.google.com/p/address-sanitizer/issues/detail?id=215,
isn't it?


On Wed, May 7, 2014 at 4:07 AM, Reid Kleckner <rnk at google.com> wrote:

> This is a good idea, because it will catch more bugs.  Consider this C++:
>
> int foo();
> template <int N> struct X { static int x; };
> template <int N> int X<N>::x = foo();
> int main() { return X<0>::x + X<2>::x + X<3>::x + X<4>::x; }
>
> This will put 4 entries into llvm.global_ctors, none of which are called
> _GLOBAL__*.  We should probably have an ASan integration test in
> compiler-rt for this, when foo accesses some global in a different TU.
>
> On the other hand, all this poisoning and unpoisoning may be expensive.
>  We could batch up all the initializers of equal priority and merge them
> into one initializer bracketed by calls to poison and unpoison.
>
>
> On Tue, May 6, 2014 at 4:55 PM, Nico Weber <thakis at chromium.org> wrote:
>
>> Hi,
>>
>> here's how the global_ctors version would look. I haven't tested this
>> much (it's different in that it could now instrument multiple
>> constructors per module).
>>
>> Feel free to play with this, and then land this with tweaks, land it
>> as-is, or don't land it, up to you :-)
>>
>> Nico
>>
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