X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FGlobalValue.h;h=d2d91303707176a9c8048a47420ee13a2a614dd5;hb=a727d5502c8e23c090da658bf14c5ebc1169a070;hp=d97c3677a471394bea525fe4cc9778091f5b3f56;hpb=8cf4c8cd05483d2e270f4be759aafa416369c43e;p=oota-llvm.git

diff --git a/include/llvm/GlobalValue.h b/include/llvm/GlobalValue.h
index d97c3677a47..d2d91303707 100644
--- a/include/llvm/GlobalValue.h
+++ b/include/llvm/GlobalValue.h
@@ -1,16 +1,17 @@
 //===-- 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 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.
+// it is subclassed by GlobalVariable, GlobalAlias 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.
 //
 //===----------------------------------------------------------------------===//
 
@@ -27,27 +28,67 @@ class Module;
 class GlobalValue : public Constant {
   GlobalValue(const GlobalValue &);             // do not implement
 public:
+  /// @brief An enumeration for the kinds of linkage for global values.
   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)
+    ExternalLinkage = 0,///< Externally visible function
+    LinkOnceLinkage,    ///< Keep one copy of 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)
+    DLLImportLinkage,   ///< Function to be imported from DLL
+    DLLExportLinkage,   ///< Function to be accessible from DLL
+    ExternalWeakLinkage,///< ExternalWeak linkage description
+    GhostLinkage        ///< Stand-in functions for streaming fns from BC files    
+  };
+
+  /// @brief An enumeration for the kinds of visibility of global values.
+  enum VisibilityTypes {
+    DefaultVisibility = 0,  ///< The GV is visible
+    HiddenVisibility,       ///< The GV is hidden
+    ProtectedVisibility     ///< The GV is protected
   };
+
 protected:
-  GlobalValue(const Type *Ty, ValueTy vty, LinkageTypes linkage,
-	      const std::string &name = "")
-    : Constant(Ty, vty, name), Linkage(linkage), Parent(0) { }
+  GlobalValue(const Type *Ty, ValueTy vty, Use *Ops, unsigned NumOps,
+              LinkageTypes linkage, const std::string &name = "")
+    : Constant(Ty, vty, Ops, NumOps), Parent(0),
+      Linkage(linkage), Visibility(DefaultVisibility), Alignment(0) {
+    if (!name.empty()) setName(name);
+  }
 
-  LinkageTypes Linkage;   // The linkage of this global
   Module *Parent;
+  // Note: VC++ treats enums as signed, so an extra bit is required to prevent
+  // Linkage and Visibility from turning into negative values.
+  LinkageTypes Linkage : 5;   // The linkage of this global
+  unsigned Visibility : 2;    // The visibility style of this global
+  unsigned Alignment : 16;    // Alignment of this symbol, must be power of two
+  std::string Section;        // Section to emit this into, empty mean default
 public:
-  virtual ~GlobalValue();
+  ~GlobalValue() {
+    removeDeadConstantUsers();   // remove any dead constants using this.
+  }
+
+  unsigned getAlignment() const { return Alignment; }
+  void setAlignment(unsigned Align) {
+    assert((Align & (Align-1)) == 0 && "Alignment is not a power of 2!");
+    Alignment = Align;
+  }
 
+  VisibilityTypes getVisibility() const { return (VisibilityTypes)Visibility; }
+  bool hasHiddenVisibility() const { return Visibility == HiddenVisibility; }
+  bool hasProtectedVisibility() const {
+    return Visibility == ProtectedVisibility;
+  }
+  void setVisibility(VisibilityTypes V) { Visibility = V; }
+  
+  bool hasSection() const { return !Section.empty(); }
+  const std::string &getSection() const { return Section; }
+  void setSection(const std::string &S) { Section = S; }
+  
   /// If the usage is empty (except transitively dead constants), then this
-  /// global value can can be safely deleted since the destructor will 
+  /// global value can can be safely deleted since the destructor will
   /// delete the dead constants as well.
-  /// @brief Determine if the usage of this global value is empty except 
+  /// @brief Determine if the usage of this global value is empty except
   /// for transitively dead constants.
   bool use_empty_except_constants();
 
@@ -56,24 +97,34 @@ public:
     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; }
+  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; }
+  bool hasDLLImportLinkage()  const { return Linkage == DLLImportLinkage; }
+  bool hasDLLExportLinkage()  const { return Linkage == DLLExportLinkage; }
+  bool hasExternalWeakLinkage() const { return Linkage == ExternalWeakLinkage; }
   void setLinkage(LinkageTypes LT) { Linkage = LT; }
   LinkageTypes getLinkage() const { return Linkage; }
 
-  /// Override from Constant class. No GlobalValue's have null values so
-  /// this always returns false.
+  /// hasNotBeenReadFromBytecode - If a module provider is being used to lazily
+  /// stream in functions from disk, this method can be used to check to see if
+  /// the function has been read in yet or not.  Unless you are working on the
+  /// JIT or something else that streams stuff in lazily, you don't need to
+  /// worry about this.
+  bool hasNotBeenReadFromBytecode() const { return Linkage == GhostLinkage; }
+
+  /// Override from Constant class. No GlobalValue's are null values so this
+  /// always returns false.
   virtual bool isNullValue() const { return false; }
 
   /// Override from Constant class.
   virtual void destroyConstant();
 
-  /// isExternal - Return true if the primary definition of this global value is
-  /// outside of the current translation unit...
-  virtual bool isExternal() const = 0;
+  /// isDeclaration - Return true if the primary definition of this global 
+  /// value is outside of the current translation unit...
+  virtual bool isDeclaration() const = 0;
 
   /// getParent - Get the module that this global value is contained inside
   /// of...
@@ -84,17 +135,14 @@ public:
   /// off of this global value, remove them.  This method is useful for clients
   /// that want to check to see if a global is unused, but don't want to deal
   /// with potentially dead constants hanging off of the globals.
-  ///
-  /// This function returns true if the global value is now dead.  If all 
-  /// users of this global are not dead, this method may return false and
-  /// leave some of them around.
-  bool removeDeadConstantUsers();
+  void removeDeadConstantUsers();
 
   // 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 GlobalValue *) { return true; }
   static inline bool classof(const Value *V) {
-    return V->getValueType() == Value::FunctionVal || 
-           V->getValueType() == Value::GlobalVariableVal;
+    return V->getValueID() == Value::FunctionVal ||
+           V->getValueID() == Value::GlobalVariableVal ||
+           V->getValueID() == Value::GlobalAliasVal;
   }
 };