diff --git a/include/llvm/CodeGen/MachineBasicBlock.h b/include/llvm/CodeGen/MachineBasicBlock.h
index 576ce944469..ef9c0c20058 100644
--- a/include/llvm/CodeGen/MachineBasicBlock.h
+++ b/include/llvm/CodeGen/MachineBasicBlock.h
@@ -117,6 +117,10 @@ public:
   /// "(null)".
   StringRef getName() const;
 
+  /// getFullName - Return a formatted string to identify this block and its
+  /// parent function.
+  std::string getFullName() const;
+
   /// hasAddressTaken - Test whether this block is potentially the target
   /// of an indirect branch.
   bool hasAddressTaken() const { return AddressTaken; }
diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index 611b0456914..ca8a8e8072a 100644
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -238,6 +238,18 @@ StringRef MachineBasicBlock::getName() const {
     return "(null)";
 }
 
+/// Return a hopefully unique identifier for this block.
+std::string MachineBasicBlock::getFullName() const {
+  std::string Name;
+  if (getParent())
+    Name = (getParent()->getFunction()->getName() + ":").str();
+  if (getBasicBlock())
+    Name += getBasicBlock()->getName();
+  else
+    Name += (Twine("BB") + Twine(getNumber())).str();
+  return Name;
+}
+
 void MachineBasicBlock::print(raw_ostream &OS, SlotIndexes *Indexes) const {
   const MachineFunction *MF = getParent();
   if (!MF) {