[LLVMdev] More ARM asan failures - Line number

[Evgeniy Stepanov]

On Tue, Oct 7, 2014 at 5:15 PM, Renato Golin <renato.golin at linaro.org> wrote:
> Hi Evgeniy,
>
> Now that I can run check-asan without the AArch64 tests, there are a
> number of ARM tests that fail with the wrong line number on the CHECK
> line...
>
> use-after-delete.cc:20:18: error: expected string not found in input
>  // CHECK-Linux: {{ #1 0x.* in main .*use-after-delete.cc:}}[[@LINE-10]]
>
> <stdin>:9:33: note: with expression "@LINE-10" equal to "10"
>  #0 0x91ac7 in operator delete[](void*) .../lib/asan/asan_new_delete.cc:98
>
> <stdin>:16:75: note: possible intended match here
> SUMMARY: AddressSanitizer: heap-use-after-free
> .../test/asan/TestCases/use-after-delete.cc:11 main
>
> Note that the line is 10+1. This is happening with a lot of the ARM
> tests. It looks like the test case having one more line due to
> lit/check not cleaning some of the meta lines (#REQUIRE etc).

Can you elaborate on this? Does it ever clean those lines? These
numbers are correct on multiple other platforms. I wonder if it's some
codegen peculiarity that leads to this off-by-one mistake? Can you go
down to the individual compile/run invocation and verify that line
numbers match (or do not match) the exact source being compiled?

> I can't think of a way to avoid this without accepting any 2-digit
> line number...
>
> Any ideas?
>
> cheers,
> --renato