Initial target-independent CodeGen support for BlockAddresses.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85556 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineBasicBlock.h

@@ -76,6 +76,10 @@ class MachineBasicBlock : public ilist_node<MachineBasicBlock> {
   /// exception handler.
   bool IsLandingPad;
 
+  /// AddressTaken - Indicate that this basic block is potentially the
+  /// target of an indirect branch.
+  bool AddressTaken;
+
   // Intrusive list support
   MachineBasicBlock() {}
 
@@ -92,6 +96,14 @@ public:
   ///
   const BasicBlock *getBasicBlock() const { return BB; }
 
+  /// hasAddressTaken - Test whether this block is potentially the target
+  /// of an indirect branch.
+  bool hasAddressTaken() const { return AddressTaken; }
+
+  /// setHasAddressTaken - Set this block to reflect that it potentially
+  /// is the target of an indirect branch.
+  void setHasAddressTaken() { AddressTaken = true; }
+
   /// getParent - Return the MachineFunction containing this basic block.
   ///
   const MachineFunction *getParent() const { return xParent; }