From 9e63dc582b3bfb9ab2e80631b5311b070a73dff8 Mon Sep 17 00:00:00 2001
From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Fri, 17 Aug 2012 00:55:32 +0000
Subject: [PATCH] Avoid binding a reference to a dereferenced null pointer, if
 we try to emit a diagnostic before we have a source manager.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162070 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Basic/Diagnostic.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/Basic/Diagnostic.cpp b/lib/Basic/Diagnostic.cpp
index 2c49c2f760..8065b2d98f 100644
--- a/lib/Basic/Diagnostic.cpp
+++ b/lib/Basic/Diagnostic.cpp
@@ -145,6 +145,9 @@ DiagnosticsEngine::GetDiagStatePointForLoc(SourceLocation L) const {
   assert(DiagStatePoints.front().Loc.isInvalid() &&
          "Should have created a DiagStatePoint for command-line");
 
+  if (!SourceMgr)
+    return DiagStatePoints.end() - 1;
+
   FullSourceLoc Loc(L, *SourceMgr);
   if (Loc.isInvalid())
     return DiagStatePoints.end() - 1;
-- 
2.40.0