[analyzer] Cleanup in UndefBranchChecker:

  - Remove unused FindUndefExpr::ProgramStateManager.
  - The Condition parameter of the callback is the terminator of the block, no need to retrieve it again.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141027 91177308-0d34-0410-b5e6-96231b3b80d8

lib/StaticAnalyzer/Checkers/UndefBranchChecker.cpp

@@ -27,10 +27,9 @@ class UndefBranchChecker : public Checker<check::BranchCondition> {
   mutable llvm::OwningPtr<BuiltinBug> BT;
 
   struct FindUndefExpr {
-    ProgramStateManager& VM;
     const ProgramState *St;
 
-    FindUndefExpr(ProgramStateManager& V, const ProgramState *S) : VM(V), St(S) {}
+    FindUndefExpr(const ProgramState *S) : St(S) {}
 
     const Expr *FindExpr(const Expr *Ex) {
       if (!MatchesCriteria(Ex))
@@ -74,19 +73,17 @@ void UndefBranchChecker::checkBranchCondition(const Stmt *Condition,
       // branch condition."  We do a recursive walk of the condition's
       // subexpressions and roughly look for the most nested subexpression
       // that binds to Undefined.  We then highlight that expression's range.
-      BlockEdge B = cast<BlockEdge>(N->getLocation());
-      const Expr *Ex = cast<Expr>(B.getSrc()->getTerminatorCondition());
-      assert (Ex && "Block must have a terminator.");
 
       // Get the predecessor node and check if is a PostStmt with the Stmt
       // being the terminator condition.  We want to inspect the state
       // of that node instead because it will contain main information about
       // the subexpressions.
-      assert (!N->pred_empty());
 
       // Note: any predecessor will do.  They should have identical state,
       // since all the BlockEdge did was act as an error sink since the value
       // had to already be undefined.
+      assert (!N->pred_empty());
+      const Expr *Ex = cast<Expr>(Condition);
       ExplodedNode *PrevN = *N->pred_begin();
       ProgramPoint P = PrevN->getLocation();
       const ProgramState *St = N->getState();
@@ -95,7 +92,7 @@ void UndefBranchChecker::checkBranchCondition(const Stmt *Condition,
         if (PS->getStmt() == Ex)
           St = PrevN->getState();
 
-      FindUndefExpr FindIt(Eng.getStateManager(), St);
+      FindUndefExpr FindIt(St);
       Ex = FindIt.FindExpr(Ex);
 
       // Emit the bug report.