From: Chris Lattner <sabre@nondot.org>
Date: Tue, 15 Mar 2005 04:40:24 +0000 (+0000)
Subject: Don't crash if computing a mapping to a node with zero size
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=841957ebaf0fffba1574a4ea5df7188753ea51ac;p=oota-llvm.git

Don't crash if computing a mapping to a node with zero size


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20595 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/DataStructure/DataStructure.cpp b/lib/Analysis/DataStructure/DataStructure.cpp
index a73a942fc7e..a94e083da3f 100644
--- a/lib/Analysis/DataStructure/DataStructure.cpp
+++ b/lib/Analysis/DataStructure/DataStructure.cpp
@@ -2075,6 +2075,8 @@ void DSGraph::computeNodeMapping(const DSNodeHandle &NH1,
   // mapping the edges together now.
   int N2Idx = NH2.getOffset()-NH1.getOffset();
   unsigned N2Size = N2->getSize();
+  if (N2Size == 0) return;   // No edges to map to.
+
   for (unsigned i = 0, e = N1->getSize(); i < e; i += DS::PointerSize)
     if (unsigned(N2Idx)+i < N2Size)
       computeNodeMapping(N1->getLink(i), N2->getLink(N2Idx+i), NodeMap);