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+//===-------- llvm/GlobalAlias.h - GlobalAlias class ------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// 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 IR.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_GLOBAL_ALIAS_H
+#define LLVM_GLOBAL_ALIAS_H
+
+#include "llvm/ADT/Twine.h"
+#include "llvm/ADT/ilist_node.h"
+#include "llvm/IR/GlobalValue.h"
+#include "llvm/IR/OperandTraits.h"
+
+namespace llvm {
+
+class Module;
+template<typename ValueSubClass, typename ItemParentClass>
+ class SymbolTableListTraits;
+
+class GlobalAlias : public GlobalValue, public ilist_node<GlobalAlias> {
+ friend class SymbolTableListTraits<GlobalAlias, Module>;
+ void operator=(const GlobalAlias &) LLVM_DELETED_FUNCTION;
+ GlobalAlias(const GlobalAlias &) LLVM_DELETED_FUNCTION;
+
+ void setParent(Module *parent);
+
+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 module's alias list.
+ GlobalAlias(Type *Ty, LinkageTypes Linkage, const Twine &Name = "",
+ Constant* Aliasee = 0, Module *Parent = 0);
+
+ /// Provide fast operand accessors
+ DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
+
+ /// removeFromParent - This method unlinks 'this' from the containing module,
+ /// but does not delete it.
+ ///
+ virtual void removeFromParent();
+
+ /// eraseFromParent - This method unlinks 'this' from the containing module
+ /// and deletes it.
+ ///
+ virtual void eraseFromParent();
+
+ /// set/getAliasee - These methods retrive and set alias target.
+ void setAliasee(Constant *GV);
+ const Constant *getAliasee() const {
+ return getOperand(0);
+ }
+ Constant *getAliasee() {
+ return 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. If stopOnWeak is false, then
+ /// the whole chain aliasing chain is traversed, otherwise - only strong
+ /// aliases.
+ const GlobalValue *resolveAliasedGlobal(bool stopOnWeak = true) const;
+
+ // Methods for support type inquiry through isa, cast, and dyn_cast:
+ static inline bool classof(const Value *V) {
+ return V->getValueID() == Value::GlobalAliasVal;
+ }
+};
+
+template <>
+struct OperandTraits<GlobalAlias> :
+ public FixedNumOperandTraits<GlobalAlias, 1> {
+};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalAlias, Constant)
+
+} // End llvm namespace
+
+#endif