Merging the linear scan register allocator in trunk. It currently passes most tests...

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

diff --git a/include/llvm/GlobalValue.h b/include/llvm/GlobalValue.h
index 394e2a262a1e68f0c22136774ffd3960632ea617..942d9b9a4081ded2b6e951a24dfbea4943ba8d43 100644 (file)
--- a/include/llvm/GlobalValue.h
+++ b/include/llvm/GlobalValue.h
@@ -1,7 +1,14 @@
-//===-- llvm/GlobalValue.h - Class to represent a global value ---*- C++ -*--=//
+//===-- llvm/GlobalValue.h - Class to represent a global value --*- 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 a common base class of all globally definable objects.  As such,
-// it is subclassed by GlobalVariable and by Method.  This is used because you
+// it is subclassed by GlobalVariable and by Function.  This is used because you
 // can do certain things with these global objects that you can't do to anything
 // else.  For example, use the address of one as a constant.
 //
@@ -11,26 +18,62 @@
 #define LLVM_GLOBALVALUE_H
 
 #include "llvm/User.h"
+
+namespace llvm {
+
 class PointerType;
+class Module;
 
 class GlobalValue : public User {
   GlobalValue(const GlobalValue &);             // do not implement
+public:
+  enum LinkageTypes {
+    ExternalLinkage,   // Externally visible function
+    LinkOnceLinkage,   // Keep one copy of named function when linking (inline)
+    WeakLinkage,       // Keep one copy of named function when linking (weak)
+    AppendingLinkage,  // Special purpose, only applies to global arrays
+    InternalLinkage    // Rename collisions when linking (static functions)
+  };
 protected:
-  GlobalValue(const Type *Ty, ValueTy vty, const string &name = "")
-    : User(Ty, vty, name) {}
+  GlobalValue(const Type *Ty, ValueTy vty, LinkageTypes linkage,
+             const std::string &name = "")
+    : User(Ty, vty, name), Linkage(linkage), Parent(0) {}
+
+  LinkageTypes Linkage;   // The linkage of this global
+  Module *Parent;
 public:
+  ~GlobalValue() {}
 
-  // getType - Global values are always pointers (FIXME, methods should be ptrs too!)
+  /// getType - Global values are always pointers.
   inline const PointerType *getType() const {
-    return (const PointerType*)User::getType();
+    return reinterpret_cast<const PointerType*>(User::getType());
   }
 
+  bool hasExternalLinkage()  const { return Linkage == ExternalLinkage; }
+  bool hasLinkOnceLinkage()  const { return Linkage == LinkOnceLinkage; }
+  bool hasWeakLinkage()      const { return Linkage == WeakLinkage; }
+  bool hasAppendingLinkage() const { return Linkage == AppendingLinkage; }
+  bool hasInternalLinkage()  const { return Linkage == InternalLinkage; }
+  void setLinkage(LinkageTypes LT) { Linkage = LT; }
+  LinkageTypes getLinkage() const { return Linkage; }
+
+  /// isExternal - Return true if the primary definition of this global value is
+  /// outside of the current translation unit...
+  virtual bool isExternal() const = 0;
+
+  /// getParent - Get the module that this global value is contained inside
+  /// of...
+  inline Module *getParent() { return Parent; }
+  inline const Module *getParent() const { return Parent; }
+
   // Methods for support type inquiry through isa, cast, and dyn_cast:
   static inline bool classof(const GlobalValue *T) { return true; }
   static inline bool classof(const Value *V) {
-    return V->getValueType() == Value::MethodVal || 
+    return V->getValueType() == Value::FunctionVal || 
            V->getValueType() == Value::GlobalVariableVal;
   }
 };
 
+} // End llvm namespace
+
 #endif