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

diff --git a/lib/Transforms/Scalar/SampleProfile.cpp b/lib/Transforms/Scalar/SampleProfile.cpp
index c7232a97764e39b8ef0806014089990846d8ff46..3e7cf04001f9f05a18c676bd5bb502af0e6d9351 100644 (file)
--- 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;