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

diff --git a/lib/IR/DebugInfo.cpp b/lib/IR/DebugInfo.cpp
index 3c7cf9e1b8d22bcdf62ba1cced7e929fb23f93bf..28244d6742998a9f617700ea83bf944e2b6b898e 100644 (file)
--- 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));