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4 Commits

Author SHA1 Message Date
Ryan Govostes 23851940e5 Revert "[asan] Make the global_metadata_darwin.ll test require El Capitan or newer" 
llvm-svn: 264764
 2016-03-29 18:27:24 +00:00
Ryan Govostes 4fdc1f0a94 [asan] Make the global_metadata_darwin.ll test require El Capitan or newer 
llvm-svn: 264758
 2016-03-29 17:58:49 +00:00
Ryan Govostes d1268bd8db [asan] Fix testcase for r264645 
llvm-svn: 264652
 2016-03-28 20:42:56 +00:00
Ryan Govostes 653f9d0273 [asan] Support dead code stripping on Mach-O platforms 
On OS X El Capitan and iOS 9, the linker supports a new section
attribute, live_support, which allows dead stripping to remove dead
globals along with the ASAN metadata about them.

With this change __asan_global structures are emitted in a new
__DATA,__asan_globals section on Darwin.

Additionally, there is a __DATA,__asan_liveness section with the
live_support attribute. Each entry in this section is simply a tuple
that binds together the liveness of a global variable and its ASAN
metadata structure. Thus the metadata structure will be alive if and
only if the global it references is also alive.

Review: http://reviews.llvm.org/D16737
llvm-svn: 264645
 2016-03-28 20:28:57 +00:00