From 14d8dbd37d06d880f010662613d501ec32c4c121 Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Fri, 20 Mar 2015 18:48:45 +0000
Subject: [PATCH] SanitizerCoverage: Check for null DebugLocs

After a WIP patch to make `DIDescriptor` accessors more strict, this
started asserting.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232832 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Instrumentation/SanitizerCoverage.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/Transforms/Instrumentation/SanitizerCoverage.cpp b/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
index 9c74b5ea5c2..9f534e4f51d 100644
--- a/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
+++ b/lib/Transforms/Instrumentation/SanitizerCoverage.cpp
@@ -329,8 +329,9 @@ void SanitizerCoverageModule::InjectCoverageAtBlock(Function &F, BasicBlock &BB,
   }
 
   bool IsEntryBB = &BB == &F.getEntryBlock();
-  DebugLoc EntryLoc =
-      IsEntryBB ? IP->getDebugLoc().getFnDebugLoc(*C) : IP->getDebugLoc();
+  DebugLoc EntryLoc = IsEntryBB && !IP->getDebugLoc().isUnknown()
+                          ? IP->getDebugLoc().getFnDebugLoc(*C)
+                          : IP->getDebugLoc();
   IRBuilder<> IRB(IP);
   IRB.SetCurrentDebugLocation(EntryLoc);
   SmallVector<Value *, 1> Indices;
-- 
2.34.1