From c2eb0116ccab71ac4ba3f65bffb547616bcf00e7 Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Tue, 21 Sep 2010 04:45:46 +0000
Subject: Check for null ObjCInterfaceDecls returned from getClassInterface()
 when generating USRs.  While I have no test case for this (could not create
 one), this shows up in crash reports.  Tentatively fixes
 <rdar://problem/8452791>.

llvm-svn: 114392
---
 clang/tools/libclang/CIndexUSRs.cpp | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

(limited to 'clang/tools/libclang/CIndexUSRs.cpp')

diff --git a/clang/tools/libclang/CIndexUSRs.cpp b/clang/tools/libclang/CIndexUSRs.cpp
index 554165754ac..4f23e59ec20 100644
--- a/clang/tools/libclang/CIndexUSRs.cpp
+++ b/clang/tools/libclang/CIndexUSRs.cpp
@@ -286,10 +286,17 @@ void USRGenerator::VisitObjCMethodDecl(ObjCMethodDecl *D) {
   do {
     if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(container))
       if (CD->IsClassExtension()) {
-        Visit(CD->getClassInterface());
-        break;
-      }    
-    Visit(cast<Decl>(D->getDeclContext()));
+        // ID can be null with invalid code.
+        if (ObjCInterfaceDecl *ID = CD->getClassInterface()) {
+          Visit(ID);
+	  break;
+        }
+        // Invalid code.  Can't generate USR.
+        IgnoreResults = true;
+        return;
+      }
+
+    Visit(container);
   }
   while (false);
   
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