From 5a043f2cb19fec00f831803e981b6afa2a8b1f8f Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Fri, 6 Feb 2009 00:13:43 +0000
Subject: [PATCH] Fix a crasher: we need to check that the function is non-null
 before using it!

llvm-svn: 63902
---
 llvm/lib/Analysis/AliasAnalysis.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Analysis/AliasAnalysis.cpp b/llvm/lib/Analysis/AliasAnalysis.cpp
index 3d1b20bba7a0..369f2f4f90e1 100644
--- a/llvm/lib/Analysis/AliasAnalysis.cpp
+++ b/llvm/lib/Analysis/AliasAnalysis.cpp
@@ -120,7 +120,7 @@ AliasAnalysis::getModRefBehavior(CallSite CS,
 AliasAnalysis::ModRefBehavior
 AliasAnalysis::getModRefBehavior(Function *F,
                                  std::vector<PointerAccessInfo> *Info) {
-  if (F->doesNotAccessMemory())
+  if (F && F->doesNotAccessMemory())
     // Can't do better than this.
     return DoesNotAccessMemory;
   return UnknownModRefBehavior;