Override use_back in instruction/basicblock to provide more type information.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30678 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/include/llvm/BasicBlock.h b/include/llvm/BasicBlock.h
index 551ca4d6c2..f15d2b46a9 100644
--- a/include/llvm/BasicBlock.h
+++ b/include/llvm/BasicBlock.h
@@ -85,6 +85,11 @@ public:
         BasicBlock *getPrev()       { return Prev; }
   const BasicBlock *getPrev() const { return Prev; }
 
+  /// use_back - Specialize the methods defined in Value, as we know that an
+  /// BasicBlock can only be used by Instructions (specifically PHI and terms).
+  Instruction       *use_back()       { return cast<Instruction>(*use_begin());}
+  const Instruction *use_back() const { return cast<Instruction>(*use_begin());}
+  
   /// getTerminator() - If this is a well formed basic block, then this returns
   /// a pointer to the terminator instruction.  If it is not, then you get a
   /// null pointer back.