[PATCH] D31358: [asan] Put ctor/dtor in comdat.

[Evgeniy Stepanov via Phabricator via llvm-commits]

eugenis created this revision.

When possible, put ASan ctor/dtor in comdat.

The only reason not to is global registration, which can be
TU-specific. This is not the case on win32, and also on ELF targets
when there are no instrumented globals.

The benefit of this is a lot less __asan_init() calls: one per DSO
instead of one per TU. It's also necessary for the upcoming
gc-sections-for-globals change on Linux, where multiple references to
section start symbols trigger quadratic behaviour in gold linker.


Repository:
  rL LLVM

https://reviews.llvm.org/D31358

Files:
  lib/Transforms/Instrumentation/AddressSanitizer.cpp
  test/Instrumentation/AddressSanitizer/basic-msvc64.ll
  test/Instrumentation/AddressSanitizer/instrument_global.ll
  test/Instrumentation/AddressSanitizer/no-globals.ll

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