add an assert
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31267 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineFunction.cpp b/lib/CodeGen/MachineFunction.cpp
index 205414e..7617de9 100644
--- a/lib/CodeGen/MachineFunction.cpp
+++ b/lib/CodeGen/MachineFunction.cpp
@@ -363,6 +363,7 @@
///
unsigned MachineJumpTableInfo::getJumpTableIndex(
std::vector<MachineBasicBlock*> &DestBBs) {
+ assert(!DestBBs.empty() && "Cannot create an empty jump table!");
for (unsigned i = 0, e = JumpTables.size(); i != e; ++i)
if (JumpTables[i].MBBs == DestBBs)
return i;