X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FUse.h;h=80804459cc339e017d0073dc47519d5dc941a1fe;hb=1b005075b6f0b698eeca69e108688d112bd44519;hp=1b8f48921ed01d23dcfe264d1fe2763dca53ed40;hpb=1ed26acc58a13f125bc9e1d5e5aa22fd479654ff;p=oota-llvm.git

diff --git a/include/llvm/Use.h b/include/llvm/Use.h
index 1b8f48921ed..80804459cc3 100644
--- a/include/llvm/Use.h
+++ b/include/llvm/Use.h
@@ -25,8 +25,8 @@
 #ifndef LLVM_USE_H
 #define LLVM_USE_H
 
-#include "llvm/Support/Casting.h"
 #include "llvm/ADT/PointerIntPair.h"
+#include "llvm/Support/Compiler.h"
 #include <cstddef>
 #include <iterator>
 
@@ -35,9 +35,8 @@ namespace llvm {
 class Value;
 class User;
 class Use;
-
-/// Tag - generic tag type for (at least 32 bit) pointers
-enum Tag { noTag, tagOne, tagTwo, tagThree };
+template<typename>
+struct simplify_type;
 
 // Use** is only 4-byte aligned.
 template<>
@@ -62,19 +61,23 @@ public:
   /// that also works with less standard-compliant compilers
   void swap(Use &RHS);
 
+  // A type for the word following an array of hung-off Uses in memory, which is
+  // a pointer back to their User with the bottom bit set.
+  typedef PointerIntPair<User*, 1, unsigned> UserRef;
+
 private:
   /// Copy ctor - do not implement
-  Use(const Use &U);
+  Use(const Use &U) LLVM_DELETED_FUNCTION;
 
   /// Destructor - Only for zap()
   ~Use() {
     if (Val) removeFromList();
   }
 
-  enum PrevPtrTag { zeroDigitTag = noTag
-                  , oneDigitTag = tagOne
-                  , stopTag = tagTwo
-                  , fullStopTag = tagThree };
+  enum PrevPtrTag { zeroDigitTag
+                  , oneDigitTag
+                  , stopTag
+                  , fullStopTag };
 
   /// Constructor
   Use(PrevPtrTag tag) : Val(0) {
@@ -110,13 +113,16 @@ public:
   Use *getNext() const { return Next; }
 
   
+  /// initTags - initialize the waymarking tags on an array of Uses, so that
+  /// getUser() can find the User from any of those Uses.
+  static Use *initTags(Use *Start, Use *Stop);
+
   /// zap - This is used to destroy Use operands when the number of operands of
   /// a User changes.
   static void zap(Use *Start, const Use *Stop, bool del = false);
 
 private:
   const Use* getImpliedUser() const;
-  static Use *initTags(Use *Start, Use *Stop);
   
   Value *Val;
   Use *Next;
@@ -138,7 +144,6 @@ private:
   }
 
   friend class Value;
-  friend class User;
 };
 
 // simplify_type - Allow clients to treat uses just like values when using
@@ -210,15 +215,6 @@ public:
   unsigned getOperandNo() const;
 };
 
-//===----------------------------------------------------------------------===//
-//                         AugmentedUse layout struct
-//===----------------------------------------------------------------------===//
-
-struct AugmentedUse : public Use {
-  PointerIntPair<User*, 1, Tag> ref;
-  AugmentedUse(); // not implemented
-};
-
 } // End llvm namespace
 
 #endif