From 67934e4b411a29383059d3ecab09dc184601c75e Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Fri, 20 Mar 2015 00:56:55 +0000
Subject: [PATCH] SampleProfile: Check for missing debug locations

Don't use `DebugLoc` accessors if we're pointing at null, which will be
a problem after a WIP patch to make the `DIDescriptor` accessors more
strict.  Caught by Frontend/profile-sample-use-loc-tracking.c (in
clang).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232792 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/SampleProfile.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/Transforms/Scalar/SampleProfile.cpp b/lib/Transforms/Scalar/SampleProfile.cpp
index c7232a97764..3e7cf04001f 100644
--- a/lib/Transforms/Scalar/SampleProfile.cpp
+++ b/lib/Transforms/Scalar/SampleProfile.cpp
@@ -217,6 +217,9 @@ void SampleProfileLoader::printBlockWeight(raw_ostream &OS, BasicBlock *BB) {
 /// \returns The profiled weight of I.
 unsigned SampleProfileLoader::getInstWeight(Instruction &Inst) {
   DebugLoc DLoc = Inst.getDebugLoc();
+  if (DLoc.isUnknown())
+    return 0;
+
   unsigned Lineno = DLoc.getLine();
   if (Lineno < HeaderLineno)
     return 0;