Fix warning when assertions disabled.

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

diff --git a/include/llvm/GlobalAlias.h b/include/llvm/GlobalAlias.h
index ec6ea77060529f44e5d19456992169d8049605bc..7c147eb62a39f0aa90d5b96cb60985286154e9e9 100644 (file)
--- a/include/llvm/GlobalAlias.h
+++ b/include/llvm/GlobalAlias.h
@@ -1,14 +1,14 @@
-//===______-- llvm/GlobalAlias.h - GlobalAlias class ------------*- C++ -*-===//
+//===-------- llvm/GlobalAlias.h - GlobalAlias class ------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by Anton Korobeynikov 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 file contains the declaration of the GlobalAlias class, which
-// represents a single function or variable alias in the VM.
+// represents a single function or variable alias in the IR.
 //
 //===----------------------------------------------------------------------===//
 
@@ -16,6 +16,7 @@
 #define LLVM_GLOBAL_ALIAS_H
 
 #include "llvm/GlobalValue.h"
+#include "llvm/OperandTraits.h"
 
 namespace llvm {
 
@@ -36,13 +37,24 @@ class GlobalAlias : public GlobalValue {
   void setNext(GlobalAlias *N) { Next = N; }
   void setPrev(GlobalAlias *N) { Prev = N; }
 
-  const GlobalValue* Aliasee;
-  std::string Target;
+  // getNext/Prev - Return the next or previous alias in the list.
+        GlobalAlias *getNext()       { return Next; }
+  const GlobalAlias *getNext() const { return Next; }
+        GlobalAlias *getPrev()       { return Prev; }
+  const GlobalAlias *getPrev() const { return Prev; }
+
 public:
+  // allocate space for exactly one operand
+  void *operator new(size_t s) {
+    return User::operator new(s, 1);
+  }
   /// GlobalAlias ctor - If a parent module is specified, the alias is
-  /// automatically inserted into the end of the specified modules alias list.
+  /// automatically inserted into the end of the specified module's alias list.
   GlobalAlias(const Type *Ty, LinkageTypes Linkage, const std::string &Name = "",
-              const GlobalValue* Aliasee = 0, Module *Parent = 0);
+              Constant* Aliasee = 0, Module *Parent = 0);
+
+  /// Provide fast operand accessors
+  DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
 
   /// isDeclaration - Is this global variable lacking an initializer?  If so, 
   /// the global variable is defined in some other translation unit, and is thus
@@ -52,32 +64,46 @@ public:
   /// removeFromParent - This method unlinks 'this' from the containing module,
   /// but does not delete it.
   ///
-  virtual void removeFromParent();
+  void removeFromParent();
 
   /// eraseFromParent - This method unlinks 'this' from the containing module
   /// and deletes it.
   ///
-  virtual void eraseFromParent();
+  void eraseFromParent();
 
   virtual void print(std::ostream &OS) const;
   void print(std::ostream *OS) const { if (OS) print(*OS); }
 
-  void setAliasee(const GlobalValue* GV);
-  const GlobalValue* getAliasee() const { return Aliasee; }
+  /// set/getAliasee - These methods retrive and set alias target.
+  void setAliasee(Constant* GV);
+  const Constant* getAliasee() const {
+    return cast_or_null<Constant>(getOperand(0));
+  }
+  Constant* getAliasee() {
+    return cast_or_null<Constant>(getOperand(0));
+  }
+  /// getAliasedGlobal() - Aliasee can be either global or bitcast of
+  /// global. This method retrives the global for both aliasee flavours.
+  const GlobalValue* getAliasedGlobal() const;
+
+  /// resolveAliasedGlobal() - This method tries to ultimately resolve the alias
+  /// by going through the aliasing chain and trying to find the very last
+  /// global. Returns NULL if a cycle was found.
+  const GlobalValue* resolveAliasedGlobal() const;
 
   // Methods for support type inquiry through isa, cast, and dyn_cast:
   static inline bool classof(const GlobalAlias *) { return true; }
   static inline bool classof(const Value *V) {
     return V->getValueID() == Value::GlobalAliasVal;
   }
-private:
-  // getNext/Prev - Return the next or previous alias in the list.
-        GlobalAlias *getNext()       { return Next; }
-  const GlobalAlias *getNext() const { return Next; }
-        GlobalAlias *getPrev()       { return Prev; }
-  const GlobalAlias *getPrev() const { return Prev; }
 };
 
+template <>
+struct OperandTraits<GlobalAlias> : FixedNumOperandTraits<1> {
+};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalAlias, Value)
+
 } // End llvm namespace
 
 #endif