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

llvm-svn: 20595
2005-03-15 04:40:24 +00:00 · 2005-03-15 04:40:24 +00:00 · 28f1caa639
parent 26415d7432
commit 28f1caa639
1 changed files with 2 additions and 0 deletions
--- a/llvm/lib/Analysis/DataStructure/DataStructure.cpp
+++ b/llvm/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);