fix memory leak in pass manager when adding an analysis pass that already existed. as pass manager takes ownership of the added passes, it has to delete the pass if it isnt added to the pass list

tweak the opt tool so that it doesnt access a Pass after the ownership was taken by the pass manager

llvm-svn: 58730

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/VMCore/PassManager.cpp b/llvm/lib/VMCore/PassManager.cpp
index ef90aace3da..6f559c47c3f 100644
--- a/llvm/lib/VMCore/PassManager.cpp
+++ b/llvm/lib/VMCore/PassManager.cpp
@@ -458,8 +458,10 @@ void PMTopLevelManager::schedulePass(Pass *P) {
   // generate the analysis again. Stale analysis info should not be
   // available at this point.
   if (P->getPassInfo() &&
-      P->getPassInfo()->isAnalysis() && findAnalysisPass(P->getPassInfo()))
+      P->getPassInfo()->isAnalysis() && findAnalysisPass(P->getPassInfo())) {
+    delete P;
     return;
+  }
 
   AnalysisUsage *AnUsage = findAnalysisUsage(P);