[llvm] r336941 - [SanitizerCoverage] Add associated metadata to 8-bit counters.

[Matt Morehouse via llvm-commits]

Author: morehouse
Date: Thu Jul 12 13:24:58 2018
New Revision: 336941

URL: http://llvm.org/viewvc/llvm-project?rev=336941&view=rev
Log:
[SanitizerCoverage] Add associated metadata to 8-bit counters.

Summary:
This allows counters associated with unused functions to be
dead-stripped along with their functions.  This approach is the same one
we used for PC tables.

Fixes an issue where LLD removes an unused PC table but leaves the 8-bit
counter.

Reviewers: eugenis

Reviewed By: eugenis

Subscribers: llvm-commits, hiraditya, kcc

Differential Revision: https://reviews.llvm.org/D49264

Modified:
    llvm/trunk/lib/Transforms/Instrumentation/SanitizerCoverage.cpp

Modified: llvm/trunk/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Instrumentation/SanitizerCoverage.cpp?rev=336941&r1=336940&r2=336941&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Instrumentation/SanitizerCoverage.cpp (original)
+++ llvm/trunk/lib/Transforms/Instrumentation/SanitizerCoverage.cpp Thu Jul 12 13:24:58 2018
@@ -595,7 +595,9 @@ void SanitizerCoverageModule::CreateFunc
   if (Options.Inline8bitCounters) {
     Function8bitCounterArray = CreateFunctionLocalArrayInSection(
         AllBlocks.size(), F, Int8Ty, SanCovCountersSectionName);
-    GlobalsToAppendToUsed.push_back(Function8bitCounterArray);
+    GlobalsToAppendToCompilerUsed.push_back(Function8bitCounterArray);
+    MDNode *MD = MDNode::get(F.getContext(), ValueAsMetadata::get(&F));
+    Function8bitCounterArray->addMetadata(LLVMContext::MD_associated, *MD);
   }
   if (Options.PCTable) {
     FunctionPCsArray = CreatePCArray(F, AllBlocks);