[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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336941 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Instrumentation/SanitizerCoverage.cpp b/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
index a933638..a4dd48c 100644
--- a/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
+++ b/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
@@ -595,7 +595,9 @@
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);
