Change getConstantValue to throw an exception on error, not return null
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8988 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bytecode/Reader/Reader.cpp b/lib/Bytecode/Reader/Reader.cpp
index c515c15..bf2b011 100644
--- a/lib/Bytecode/Reader/Reader.cpp
+++ b/lib/Bytecode/Reader/Reader.cpp
@@ -164,7 +164,10 @@
///
Constant *BytecodeParser::getConstantValue(const Type *Ty, unsigned Slot) {
if (Value *V = getValue(Ty, Slot, false))
- return dyn_cast<Constant>(V); // If we already have the value parsed...
+ if (Constant *C = dyn_cast<Constant>(V))
+ return C; // If we already have the value parsed, just return it
+ else
+ throw std::string("Reference of a value is expected to be a constant!");
std::pair<const Type*, unsigned> Key(Ty, Slot);
GlobalRefsType::iterator I = GlobalRefs.lower_bound(Key);