diff options
| author | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2017-04-06 19:55:17 +0000 |
|---|---|---|
| committer | Evgeniy Stepanov <eugeni.stepanov@gmail.com> | 2017-04-06 19:55:17 +0000 |
| commit | 6c3a8cbc4d98103475f072792bae2c4a1659db01 (patch) | |
| tree | 8ac837d3d464188ea6b6c39f159660367ef36365 /llvm/lib/IR/Module.cpp | |
| parent | 5dfe420d108d48d1864d1c7ef87b0fd907fe8a7b (diff) | |
| download | bcm5719-llvm-6c3a8cbc4d98103475f072792bae2c4a1659db01.tar.gz bcm5719-llvm-6c3a8cbc4d98103475f072792bae2c4a1659db01.zip | |
[asan] Fix dead stripping of globals on Linux.
Use a combination of !associated, comdat, @llvm.compiler.used and
custom sections to allow dead stripping of globals and their asan
metadata. Sometimes.
Currently this works on LLD, which supports SHF_LINK_ORDER with
sh_link pointing to the associated section.
This also works on BFD, which seems to treat comdats as
all-or-nothing with respect to linker GC. There is a weird quirk
where the "first" global in each link is never GC-ed because of the
section symbols.
At this moment it does not work on Gold (as in the globals are never
stripped).
This is a re-land of r298158 rebased on D31358. This time,
asan.module_ctor is put in a comdat as well to avoid quadratic
behavior in Gold.
llvm-svn: 299697
Diffstat (limited to 'llvm/lib/IR/Module.cpp')
0 files changed, 0 insertions, 0 deletions
