Workaround for a compiler bug (see <rdar://problem/5852746>). Once that bug is

[oota-llvm.git] / include / llvm / Use.h

diff --git a/include/llvm/Use.h b/include/llvm/Use.h
index bbf523574cd61afc7ae94d1bc6cae48b5becb5dd..e050743ffdb0c3737c22a6e28cd16c8e94db2c28 100644 (file)
--- a/include/llvm/Use.h
+++ b/include/llvm/Use.h
@@ -1,10 +1,10 @@
 //===-- llvm/Use.h - Definition of the Use class ----------------*- C++ -*-===//
-// 
+//
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-// 
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
 //===----------------------------------------------------------------------===//
 //
 // This defines the Use class.  The Use class represents the operand of an
@@ -37,7 +37,9 @@ public:
 
   Use(Value *V, User *U) { init(V, U); }
   Use(const Use &U) { init(U.Val, U.U); }
-  inline ~Use();
+  inline ~Use() {
+    if (Val) removeFromList();
+  }
 
   /// Default ctor - This leaves the Use completely unitialized.  The only thing
   /// that is valid to do with this use is to call the "init" method.
@@ -105,7 +107,7 @@ class value_use_iterator : public forward_iterator<UserTy*, ptrdiff_t> {
   typedef value_use_iterator<UserTy> _Self;
 
   Use *U;
-  value_use_iterator(Use *u) : U(u) {}
+  explicit value_use_iterator(Use *u) : U(u) {}
   friend class Value;
 public:
   typedef typename super::reference reference;
@@ -114,25 +116,28 @@ public:
   value_use_iterator(const _Self &I) : U(I.U) {}
   value_use_iterator() {}
 
-  bool operator==(const _Self &x) const { 
+  bool operator==(const _Self &x) const {
     return U == x.U;
   }
   bool operator!=(const _Self &x) const {
     return !operator==(x);
   }
 
+  /// atEnd - return true if this iterator is equal to use_end() on the value.
+  bool atEnd() const { return U == 0; }
+
   // Iterator traversal: forward iteration only
   _Self &operator++() {          // Preincrement
     assert(U && "Cannot increment end iterator!");
     U = U->getNext();
-    return *this; 
+    return *this;
   }
   _Self operator++(int) {        // Postincrement
-    _Self tmp = *this; ++*this; return tmp; 
+    _Self tmp = *this; ++*this; return tmp;
   }
 
-  // Retrieve a reference to the current SCC
-   UserTy *operator*() const { 
+  // Retrieve a reference to the current User
+  UserTy *operator*() const {
     assert(U && "Cannot increment end iterator!");
     return U->getUser();
   }
@@ -140,8 +145,37 @@ public:
   UserTy *operator->() const { return operator*(); }
 
   Use &getUse() const { return *U; }
+  
+  /// getOperandNo - Return the operand # of this use in its User.  Defined in
+  /// User.h
+  ///
+  unsigned getOperandNo() const;
+};
+
+
+template<> struct simplify_type<value_use_iterator<User> > {
+  typedef User* SimpleType;
+  
+  static SimpleType getSimplifiedValue(const value_use_iterator<User> &Val) {
+    return *Val;
+  }
 };
 
+template<> struct simplify_type<const value_use_iterator<User> >
+ : public simplify_type<value_use_iterator<User> > {};
+
+template<> struct simplify_type<value_use_iterator<const User> > {
+  typedef const User* SimpleType;
+  
+  static SimpleType getSimplifiedValue(const 
+                                       value_use_iterator<const User> &Val) {
+    return *Val;
+  }
+};
+
+template<> struct simplify_type<const value_use_iterator<const User> >
+  : public simplify_type<value_use_iterator<const User> > {};
+
 } // End llvm namespace
 
 #endif