Assert to bounds check MDNode::getOperand.

The getOperandPtr utility already bounds checks, but allows one-off-the-end.
This assert should catch the cases that could previously have been dereferencing
these one-off-the-end pointer. Happily, no cases of this came up with this
change.

llvm-svn: 176721

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/IR/Metadata.cpp b/llvm/lib/IR/Metadata.cpp
index d751064e222..0228aeb31f5 100644
--- a/llvm/lib/IR/Metadata.cpp
+++ b/llvm/lib/IR/Metadata.cpp
@@ -303,6 +303,7 @@ void MDNode::deleteTemporary(MDNode *N) {
 
 /// getOperand - Return specified operand.
 Value *MDNode::getOperand(unsigned i) const {
+  assert(i < getNumOperands() && "Invalid operand number");
   return *getOperandPtr(const_cast<MDNode*>(this), i);
 }