fix a segfault in cases where there are no cases.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41317 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Sema/SemaStmt.cpp b/Sema/SemaStmt.cpp
index c660b71..ee3a8e6 100644
--- a/Sema/SemaStmt.cpp
+++ b/Sema/SemaStmt.cpp
@@ -274,16 +274,18 @@
// Sort all the scalar case values so we can easily detect duplicates.
std::stable_sort(CaseVals.begin(), CaseVals.end());
- for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) {
- if (CaseVals[i].first == CaseVals[i+1].first) {
- // If we have a duplicate, report it.
- Diag(CaseVals[i+1].second->getLHS()->getLocStart(),
- diag::err_duplicate_case, CaseVals[i].first.toString());
- Diag(CaseVals[i].second->getLHS()->getLocStart(),
- diag::err_duplicate_case_prev);
- // FIXME: We really want to remove the bogus case stmt from the substmt,
- // but we have no way to do this right now.
- CaseListIsErroneous = true;
+ if (!CaseVals.empty()) {
+ for (unsigned i = 0, e = CaseVals.size()-1; i != e; ++i) {
+ if (CaseVals[i].first == CaseVals[i+1].first) {
+ // If we have a duplicate, report it.
+ Diag(CaseVals[i+1].second->getLHS()->getLocStart(),
+ diag::err_duplicate_case, CaseVals[i].first.toString());
+ Diag(CaseVals[i].second->getLHS()->getLocStart(),
+ diag::err_duplicate_case_prev);
+ // FIXME: We really want to remove the bogus case stmt from the substmt,
+ // but we have no way to do this right now.
+ CaseListIsErroneous = true;
+ }
}
}