From 61b4b8088d2f0a592e19dcf870a727d72e2d0aa3 Mon Sep 17 00:00:00 2001
From: Adrian Prantl <aprantl@apple.com>
Date: Tue, 20 Jan 2015 18:03:37 +0000
Subject: [PATCH] Add an assertion and prefer a crash over an infinite loop.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226588 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/IR/DebugInfo.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/IR/DebugInfo.cpp b/lib/IR/DebugInfo.cpp
index c5c1115797..0dd46b7619 100644
--- a/lib/IR/DebugInfo.cpp
+++ b/lib/IR/DebugInfo.cpp
@@ -527,12 +527,15 @@ bool DISubprogram::Verify() const {
         while ((IA = DL.getInlinedAt()))
           DL = DebugLoc::getFromDILocation(IA);
         DL.getScopeAndInlinedAt(Scope, IA);
+        assert(Scope && "debug location has no scope");
         assert(!IA);
         while (!DIDescriptor(Scope).isSubprogram()) {
           DILexicalBlockFile D(Scope);
           Scope = D.isLexicalBlockFile()
                       ? D.getScope()
                       : DebugLoc::getFromDILexicalBlock(Scope).getScope();
+          if (!Scope)
+            llvm_unreachable("lexical block file has no scope");
         }
         if (!DISubprogram(Scope).describes(F))
           return false;
-- 
2.39.2