X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FGlobalValue.h;h=0df7ababed70ee4441a4565df0a5a35a65f7b0a7;hb=ab9238e876dcf6da101d8ae626925bcd9e537a7e;hp=4f6b1e6a9f96a1fcf23f431b0fc5dfac5bb1d86d;hpb=6f9896fcc81a1128b5f436d1763cc6213745adf1;p=oota-llvm.git

diff --git a/include/llvm/GlobalValue.h b/include/llvm/GlobalValue.h
index 4f6b1e6a9f9..0df7ababed7 100644
--- a/include/llvm/GlobalValue.h
+++ b/include/llvm/GlobalValue.h
@@ -2,15 +2,16 @@
 //
 //                     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 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.
 //
 //===----------------------------------------------------------------------===//
 
@@ -30,14 +31,19 @@ public:
   /// @brief An enumeration for the kinds of linkage for global values.
   enum LinkageTypes {
     ExternalLinkage = 0,///< Externally visible function
-    LinkOnceLinkage,    ///< Keep one copy of function when linking (inline)
-    WeakLinkage,        ///< Keep one copy of named function when linking (weak)
+    AvailableExternallyLinkage, ///< Available for inspection, not emission.
+    LinkOnceAnyLinkage, ///< Keep one copy of function when linking (inline)
+    LinkOnceODRLinkage, ///< Same, but only replaced by something equivalent.
+    WeakAnyLinkage,     ///< Keep one copy of named function when linking (weak)
+    WeakODRLinkage,     ///< Same, but only replaced by something equivalent.
     AppendingLinkage,   ///< Special purpose, only applies to global arrays
     InternalLinkage,    ///< Rename collisions when linking (static functions)
+    PrivateLinkage,     ///< Like Internal, but omit from symbol table
     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    
+    GhostLinkage,       ///< Stand-in functions for streaming fns from BC files
+    CommonLinkage       ///< Tentative definitions
   };
 
   /// @brief An enumeration for the kinds of visibility of global values.
@@ -48,9 +54,9 @@ public:
   };
 
 protected:
-  GlobalValue(const Type *Ty, ValueTy vty, Use *Ops, unsigned NumOps,
+  GlobalValue(const Type *ty, ValueTy vty, Use *Ops, unsigned NumOps,
               LinkageTypes linkage, const std::string &name = "")
-    : Constant(Ty, vty, Ops, NumOps), Parent(0),
+    : Constant(ty, vty, Ops, NumOps), Parent(0),
       Linkage(linkage), Visibility(DefaultVisibility), Alignment(0) {
     if (!name.empty()) setName(name);
   }
@@ -73,7 +79,8 @@ public:
     Alignment = Align;
   }
 
-  VisibilityTypes getVisibility() const { return (VisibilityTypes)Visibility; }
+  VisibilityTypes getVisibility() const { return VisibilityTypes(Visibility); }
+  bool hasDefaultVisibility() const { return Visibility == DefaultVisibility; }
   bool hasHiddenVisibility() const { return Visibility == HiddenVisibility; }
   bool hasProtectedVisibility() const {
     return Visibility == ProtectedVisibility;
@@ -96,23 +103,70 @@ 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 hasDLLImportLinkage()  const { return Linkage == DLLImportLinkage; }
-  bool hasDLLExportLinkage()  const { return Linkage == DLLExportLinkage; }
+  static LinkageTypes getLinkOnceLinkage(bool ODR) {
+    return ODR ? LinkOnceODRLinkage : LinkOnceAnyLinkage;
+  }
+  static LinkageTypes getWeakLinkage(bool ODR) {
+    return ODR ? WeakODRLinkage : WeakAnyLinkage;
+  }
+
+  bool hasExternalLinkage() const { return Linkage == ExternalLinkage; }
+  bool hasAvailableExternallyLinkage() const {
+    return Linkage == AvailableExternallyLinkage;
+  }
+  bool hasLinkOnceLinkage() const {
+    return Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage;
+  }
+  bool hasWeakLinkage() const {
+    return Linkage == WeakAnyLinkage || Linkage == WeakODRLinkage;
+  }
+  bool hasAppendingLinkage() const { return Linkage == AppendingLinkage; }
+  bool hasInternalLinkage() const { return Linkage == InternalLinkage; }
+  bool hasPrivateLinkage() const { return Linkage == PrivateLinkage; }
+  bool hasLocalLinkage() const {
+    return Linkage == InternalLinkage || Linkage == PrivateLinkage;
+  }
+  bool hasDLLImportLinkage() const { return Linkage == DLLImportLinkage; }
+  bool hasDLLExportLinkage() const { return Linkage == DLLExportLinkage; }
   bool hasExternalWeakLinkage() const { return Linkage == ExternalWeakLinkage; }
+  bool hasGhostLinkage() const { return Linkage == GhostLinkage; }
+  bool hasCommonLinkage() const { return Linkage == CommonLinkage; }
+
   void setLinkage(LinkageTypes LT) { Linkage = LT; }
   LinkageTypes getLinkage() const { return Linkage; }
 
-  /// hasNotBeenReadFromBytecode - If a module provider is being used to lazily
+  /// mayBeOverridden - Whether the definition of this global may be replaced
+  /// by something non-equivalent at link time.  For example, if a function has
+  /// weak linkage then the code defining it may be replaced by different code.
+  bool mayBeOverridden() const {
+    return (Linkage == WeakAnyLinkage ||
+            Linkage == LinkOnceAnyLinkage ||
+            Linkage == CommonLinkage ||
+            Linkage == ExternalWeakLinkage);
+  }
+
+  /// isWeakForLinker - Whether the definition of this global may be replaced at
+  /// link time.
+  bool isWeakForLinker() const {
+    return (Linkage == AvailableExternallyLinkage ||
+            Linkage == WeakAnyLinkage ||
+            Linkage == WeakODRLinkage ||
+            Linkage == LinkOnceAnyLinkage ||
+            Linkage == LinkOnceODRLinkage ||
+            Linkage == CommonLinkage ||
+            Linkage == ExternalWeakLinkage);
+  }
+
+  /// copyAttributesFrom - copy all additional attributes (those not needed to
+  /// create a GlobalValue) from the GlobalValue Src to this one.
+  virtual void copyAttributesFrom(const GlobalValue *Src);
+
+  /// hasNotBeenReadFromBitcode - 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; }
+  bool hasNotBeenReadFromBitcode() const { return Linkage == GhostLinkage; }
 
   /// Override from Constant class. No GlobalValue's are null values so this
   /// always returns false.
@@ -125,6 +179,14 @@ public:
   /// value is outside of the current translation unit...
   virtual bool isDeclaration() const = 0;
 
+  /// removeFromParent - This method unlinks 'this' from the containing module,
+  /// but does not delete it.
+  virtual void removeFromParent() = 0;
+
+  /// eraseFromParent - This method unlinks 'this' from the containing module
+  /// and deletes it.
+  virtual void eraseFromParent() = 0;
+
   /// getParent - Get the module that this global value is contained inside
   /// of...
   inline Module *getParent() { return Parent; }
@@ -134,7 +196,7 @@ 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.
-  void removeDeadConstantUsers();
+  void removeDeadConstantUsers() const;
 
   // Methods for support type inquiry through isa, cast, and dyn_cast:
   static inline bool classof(const GlobalValue *) { return true; }