[llvm-commits] [llvm] r46318 - /llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp

[Chris Lattner]

Author: lattner
Date: Thu Jan 24 13:07:10 2008
New Revision: 46318

URL: http://llvm.org/viewvc/llvm-project?rev=46318&view=rev
Log:
getUnderlyingObject can return null, handle this.

Modified:
    llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp

Modified: llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp?rev=46318&r1=46317&r2=46318&view=diff

==============================================================================
--- llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp (original)
+++ llvm/trunk/lib/Analysis/BasicAliasAnalysis.cpp Thu Jan 24 13:07:10 2008
@@ -245,8 +245,9 @@
   if (!isa<Constant>(P)) {
     const Value *Object = getUnderlyingObject(P);
     // Allocations and byval arguments are "new" objects.
-    if (isa<AllocationInst>(Object) ||
-        (isa<Argument>(Object) && cast<Argument>(Object)->hasByValAttr())) {
+    if (Object &&
+        (isa<AllocationInst>(Object) ||
+         (isa<Argument>(Object) && cast<Argument>(Object)->hasByValAttr()))) {
       // Okay, the pointer is to a stack allocated object.  If we can prove that
       // the pointer never "escapes", then we know the call cannot clobber it,
       // because it simply can't get its address.