[PATCH] Add iterator and iterator range to PredIteratorCache

[Daniel Berlin]

Hi chandlerc,

This lets us use range based for loops, and generally makes the interface much closer to
normal pred iterators.

http://reviews.llvm.org/D9169

Files:
  include/llvm/IR/PredIteratorCache.h

Index: include/llvm/IR/PredIteratorCache.h
===================================================================
--- include/llvm/IR/PredIteratorCache.h
+++ include/llvm/IR/PredIteratorCache.h
@@ -14,6 +14,7 @@
 #ifndef LLVM_IR_PREDITERATORCACHE_H
 #define LLVM_IR_PREDITERATORCACHE_H
 
+#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/IR/CFG.h"
@@ -32,6 +33,13 @@
     /// Memory - This is the space that holds cached preds.
     BumpPtrAllocator Memory;
   public:
+    ArrayRef<BasicBlock *>::iterator begin(BasicBlock *BB) {
+      return makeArrayRef(GetPreds(BB), GetNumPreds(BB)).begin();
+    }
+
+    ArrayRef<BasicBlock *>::iterator end(BasicBlock *BB) {
+      return makeArrayRef(GetPreds(BB), GetNumPreds(BB)).end();
+    }
 
     /// GetPreds - Get a cached list for the null-terminated predecessor list of
     /// the specified block.  This can be used in a loop like this:
@@ -65,6 +73,12 @@
       Memory.Reset();
     }
   };
+
+  iterator_range<ArrayRef<BasicBlock *>::iterator>
+  cached_predecessors(PredIteratorCache &PC, BasicBlock *BB) {
+    return make_range(PC.begin(BB), PC.end(BB));
+  }
+
 } // end namespace llvm
 
 #endif

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