From c867853c90e82250e3dbf35d9ce8a1ab4c331ab4 Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Fri, 20 Mar 2015 19:13:53 +0000
Subject: [PATCH] DebugInfoFinder: Check for null imported entities

Don't use the accessors in `DIImportedEntity` on a null pointer.  (A WIP
patch to make `DIDescriptor` accessors more strict crashes here
otherwise.)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232833 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/IR/DebugInfo.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/IR/DebugInfo.cpp b/lib/IR/DebugInfo.cpp
index 3c7cf9e1b8d..28244d67429 100644
--- a/lib/IR/DebugInfo.cpp
+++ b/lib/IR/DebugInfo.cpp
@@ -674,6 +674,8 @@ void DebugInfoFinder::processModule(const Module &M) {
       DIArray Imports = CU.getImportedEntities();
       for (unsigned i = 0, e = Imports.getNumElements(); i != e; ++i) {
         DIImportedEntity Import = DIImportedEntity(Imports.getElement(i));
+        if (!Import)
+          continue;
         DIDescriptor Entity = Import.getEntity().resolve(TypeIdentifierMap);
         if (Entity.isType())
           processType(DIType(Entity));