[OPENMP] Add a check for iterator not reached the end of stack, NFC.

Add an extra check for the iterator during checks of the data-sharing
attributes.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@301549 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Sema/SemaOpenMP.cpp b/lib/Sema/SemaOpenMP.cpp
index 9a190236586954cea6c7dab94e88cb71caf08d4c..43fd055bbc56545fe46d6ad94d7cf992c2cb686a 100644 (file)
--- a/lib/Sema/SemaOpenMP.cpp
+++ b/lib/Sema/SemaOpenMP.cpp
@@ -828,14 +828,14 @@ DSAStackTy::hasDSA(ValueDecl *D,
                ? std::next(Stack.back().first.rbegin())
                : Stack.back().first.rbegin();
   auto EndI = Stack.back().first.rend();
-  do {
+  while (std::distance(I, EndI) > 1) {
     std::advance(I, 1);
     if (!DPred(I->Directive) && !isParallelOrTaskRegion(I->Directive))
       continue;
     DSAVarData DVar = getDSA(I, D);
     if (CPred(DVar.CKind))
       return DVar;
-  } while (std::distance(I, EndI) > 1);
+  }
   return {};
 }