Identify Analysis pass.

Do not run analysis pass again if analysis info is still available.
This fixes PR1441.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48476 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/include/llvm/Analysis/Dominators.h b/include/llvm/Analysis/Dominators.h
index ce305d5..8c1a3ed 100644
--- a/include/llvm/Analysis/Dominators.h
+++ b/include/llvm/Analysis/Dominators.h
@@ -300,6 +300,9 @@ public:
   // FIXME: Should remove this
   virtual bool runOnFunction(Function &F) { return false; }
 
+  /// isAnalysis - Return true if this pass is  implementing an analysis pass.
+  virtual bool isAnalysis() const { return true; }
+
   virtual void releaseMemory() { reset(); }
 
   /// getNode - return the (Post)DominatorTree node for the specified basic
@@ -691,6 +694,9 @@ public:
     return DT->getRootNode();
   }
   
+  /// isAnalysis - Return true if this pass is  implementing an analysis pass.
+  virtual bool isAnalysis() const { return true; }
+
   virtual bool runOnFunction(Function &F);
   
   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
@@ -910,6 +916,9 @@ public:
     return Roots[0];
   }
 
+  /// isAnalysis - Return true if this pass is  implementing an analysis pass.
+  virtual bool isAnalysis() const { return true; }
+
   virtual bool runOnFunction(Function &) {
     Frontiers.clear();
     DominatorTree &DT = getAnalysis<DominatorTree>();