r256012 - Add a defensive check for a nullptr.

[Adrian Prantl via cfe-commits]

Author: adrian
Date: Fri Dec 18 13:44:31 2015
New Revision: 256012

URL: http://llvm.org/viewvc/llvm-project?rev=256012&view=rev
Log:
Add a defensive check for a nullptr.

Modified:
    cfe/trunk/lib/CodeGen/CGDebugInfo.cpp

Modified: cfe/trunk/lib/CodeGen/CGDebugInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGDebugInfo.cpp?rev=256012&r1=256011&r2=256012&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGDebugInfo.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGDebugInfo.cpp Fri Dec 18 13:44:31 2015
@@ -3443,11 +3443,13 @@ void CGDebugInfo::EmitUsingDecl(const Us
 }
 
 void CGDebugInfo::EmitImportDecl(const ImportDecl &ID) {
-  auto Info = ExternalASTSource::ASTSourceDescriptor(*ID.getImportedModule());
-  DBuilder.createImportedDeclaration(
-      getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
-      getOrCreateModuleRef(Info, DebugTypeExtRefs),
-      getLineNumber(ID.getLocation()));
+  if (Module *M = ID.getImportedModule()) {
+    auto Info = ExternalASTSource::ASTSourceDescriptor(*ID.getImportedModule());
+    DBuilder.createImportedDeclaration(
+        getCurrentContextDescriptor(cast<Decl>(ID.getDeclContext())),
+        getOrCreateModuleRef(Info, DebugTypeExtRefs),
+        getLineNumber(ID.getLocation()));
+  }
 }
 
 llvm::DIImportedEntity *