X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FGlobalValue.h;h=7f7f74b1e2da5e34b33c147c99871cfbb4fef11b;hb=db55fc9dd8f6ede9b5337ba1f1d7cf0adfb1cc1a;hp=658967d81a344c2a5c0079a76723e1c900cc9e04;hpb=07d317711781d8c9268f7d6afcf1ba7eadf1d127;p=oota-llvm.git

diff --git a/include/llvm/GlobalValue.h b/include/llvm/GlobalValue.h
index 658967d81a3..7f7f74b1e2d 100644
--- a/include/llvm/GlobalValue.h
+++ b/include/llvm/GlobalValue.h
@@ -26,7 +26,7 @@ class PointerType;
 class Module;
 
 class GlobalValue : public Constant {
-  GlobalValue(const GlobalValue &);             // do not implement
+  GlobalValue(const GlobalValue &) LLVM_DELETED_FUNCTION;
 public:
   /// @brief An enumeration for the kinds of linkage for global values.
   enum LinkageTypes {
@@ -34,12 +34,14 @@ public:
     AvailableExternallyLinkage, ///< Available for inspection, not emission.
     LinkOnceAnyLinkage, ///< Keep one copy of function when linking (inline)
     LinkOnceODRLinkage, ///< Same, but only replaced by something equivalent.
+    LinkOnceODRAutoHideLinkage, ///< Like LinkOnceODRLinkage but addr not taken.
     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.
     LinkerPrivateLinkage, ///< Like Private, but linker removes.
+    LinkerPrivateWeakLinkage, ///< Like LinkerPrivate, but weak.
     DLLImportLinkage,   ///< Function to be imported from DLL
     DLLExportLinkage,   ///< Function to be accessible from DLL.
     ExternalWeakLinkage,///< ExternalWeak linkage description.
@@ -54,30 +56,33 @@ public:
   };
 
 protected:
-  GlobalValue(const Type *ty, ValueTy vty, Use *Ops, unsigned NumOps,
+  GlobalValue(Type *ty, ValueTy vty, Use *Ops, unsigned NumOps,
               LinkageTypes linkage, const Twine &Name)
-    : Constant(ty, vty, Ops, NumOps), Parent(0),
-      Linkage(linkage), Visibility(DefaultVisibility), Alignment(0) {
+    : Constant(ty, vty, Ops, NumOps), Linkage(linkage),
+      Visibility(DefaultVisibility), Alignment(0), UnnamedAddr(0), Parent(0) {
     setName(Name);
   }
 
-  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
+  unsigned UnnamedAddr : 1;   // This value's address is not significant
+  Module *Parent;             // The containing module.
   std::string Section;        // Section to emit this into, empty mean default
 public:
   ~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;
+  unsigned getAlignment() const {
+    return (1u << Alignment) >> 1;
   }
+  void setAlignment(unsigned Align);
+
+  bool hasUnnamedAddr() const { return UnnamedAddr; }
+  void setUnnamedAddr(bool Val) { UnnamedAddr = Val; }
 
   VisibilityTypes getVisibility() const { return VisibilityTypes(Visibility); }
   bool hasDefaultVisibility() const { return Visibility == DefaultVisibility; }
@@ -99,8 +104,8 @@ public:
   bool use_empty_except_constants();
 
   /// getType - Global values are always pointers.
-  inline const PointerType *getType() const {
-    return reinterpret_cast<const PointerType*>(User::getType());
+  inline PointerType *getType() const {
+    return reinterpret_cast<PointerType*>(User::getType());
   }
 
   static LinkageTypes getLinkOnceLinkage(bool ODR) {
@@ -117,7 +122,12 @@ public:
     return Linkage == AvailableExternallyLinkage;
   }
   static bool isLinkOnceLinkage(LinkageTypes Linkage) {
-    return Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage;
+    return Linkage == LinkOnceAnyLinkage ||
+           Linkage == LinkOnceODRLinkage ||
+           Linkage == LinkOnceODRAutoHideLinkage;
+  }
+  static bool isLinkOnceODRAutoHideLinkage(LinkageTypes Linkage) {
+    return Linkage == LinkOnceODRAutoHideLinkage;
   }
   static bool isWeakLinkage(LinkageTypes Linkage) {
     return Linkage == WeakAnyLinkage || Linkage == WeakODRLinkage;
@@ -132,11 +142,14 @@ public:
     return Linkage == PrivateLinkage;
   }
   static bool isLinkerPrivateLinkage(LinkageTypes Linkage) {
-    return Linkage==LinkerPrivateLinkage;
+    return Linkage == LinkerPrivateLinkage;
+  }
+  static bool isLinkerPrivateWeakLinkage(LinkageTypes Linkage) {
+    return Linkage == LinkerPrivateWeakLinkage;
   }
   static bool isLocalLinkage(LinkageTypes Linkage) {
     return isInternalLinkage(Linkage) || isPrivateLinkage(Linkage) ||
-      isLinkerPrivateLinkage(Linkage);
+      isLinkerPrivateLinkage(Linkage) || isLinkerPrivateWeakLinkage(Linkage);
   }
   static bool isDLLImportLinkage(LinkageTypes Linkage) {
     return Linkage == DLLImportLinkage;
@@ -151,26 +164,37 @@ public:
     return Linkage == CommonLinkage;
   }
 
+  /// isDiscardableIfUnused - Whether the definition of this global may be
+  /// discarded if it is not used in its compilation unit.
+  static bool isDiscardableIfUnused(LinkageTypes Linkage) {
+    return isLinkOnceLinkage(Linkage) || isLocalLinkage(Linkage);
+  }
+
   /// 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.
   static bool mayBeOverridden(LinkageTypes Linkage) {
-    return (Linkage == WeakAnyLinkage ||
-            Linkage == LinkOnceAnyLinkage ||
-            Linkage == CommonLinkage ||
-            Linkage == ExternalWeakLinkage);
+    return Linkage == WeakAnyLinkage ||
+           Linkage == LinkOnceAnyLinkage ||
+           Linkage == CommonLinkage ||
+           Linkage == ExternalWeakLinkage ||
+           Linkage == LinkerPrivateWeakLinkage;
   }
 
   /// isWeakForLinker - Whether the definition of this global may be replaced at
-  /// link time.
+  /// link time.  NB: Using this method outside of the code generators is almost
+  /// always a mistake: when working at the IR level use mayBeOverridden instead
+  /// as it knows about ODR semantics.
   static bool isWeakForLinker(LinkageTypes Linkage)  {
-    return (Linkage == AvailableExternallyLinkage ||
-            Linkage == WeakAnyLinkage ||
-            Linkage == WeakODRLinkage ||
-            Linkage == LinkOnceAnyLinkage ||
-            Linkage == LinkOnceODRLinkage ||
-            Linkage == CommonLinkage ||
-            Linkage == ExternalWeakLinkage);
+    return Linkage == AvailableExternallyLinkage ||
+           Linkage == WeakAnyLinkage ||
+           Linkage == WeakODRLinkage ||
+           Linkage == LinkOnceAnyLinkage ||
+           Linkage == LinkOnceODRLinkage ||
+           Linkage == LinkOnceODRAutoHideLinkage ||
+           Linkage == CommonLinkage ||
+           Linkage == ExternalWeakLinkage ||
+           Linkage == LinkerPrivateWeakLinkage;
   }
 
   bool hasExternalLinkage() const { return isExternalLinkage(Linkage); }
@@ -180,6 +204,9 @@ public:
   bool hasLinkOnceLinkage() const {
     return isLinkOnceLinkage(Linkage);
   }
+  bool hasLinkOnceODRAutoHideLinkage() const {
+    return isLinkOnceODRAutoHideLinkage(Linkage);
+  }
   bool hasWeakLinkage() const {
     return isWeakLinkage(Linkage);
   }
@@ -187,6 +214,9 @@ public:
   bool hasInternalLinkage() const { return isInternalLinkage(Linkage); }
   bool hasPrivateLinkage() const { return isPrivateLinkage(Linkage); }
   bool hasLinkerPrivateLinkage() const { return isLinkerPrivateLinkage(Linkage); }
+  bool hasLinkerPrivateWeakLinkage() const {
+    return isLinkerPrivateWeakLinkage(Linkage);
+  }
   bool hasLocalLinkage() const { return isLocalLinkage(Linkage); }
   bool hasDLLImportLinkage() const { return isDLLImportLinkage(Linkage); }
   bool hasDLLExportLinkage() const { return isDLLExportLinkage(Linkage); }
@@ -196,6 +226,10 @@ public:
   void setLinkage(LinkageTypes LT) { Linkage = LT; }
   LinkageTypes getLinkage() const { return Linkage; }
 
+  bool isDiscardableIfUnused() const {
+    return isDiscardableIfUnused(Linkage);
+  }
+
   bool mayBeOverridden() const { return mayBeOverridden(Linkage); }
 
   bool isWeakForLinker() const { return isWeakForLinker(Linkage); }
@@ -232,16 +266,12 @@ public:
 
 /// @}
 
-  /// 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();
 
   /// isDeclaration - Return true if the primary definition of this global 
-  /// value is outside of the current translation unit...
-  virtual bool isDeclaration() const = 0;
+  /// value is outside of the current translation unit.
+  bool isDeclaration() const;
 
   /// removeFromParent - This method unlinks 'this' from the containing module,
   /// but does not delete it.
@@ -256,14 +286,7 @@ public:
   inline Module *getParent() { return Parent; }
   inline const Module *getParent() const { return Parent; }
 
-  /// removeDeadConstantUsers - If there are any dead constant users dangling
-  /// 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() const;
-
   // Methods for support type inquiry through isa, cast, and dyn_cast:
-  static inline bool classof(const GlobalValue *) { return true; }
   static inline bool classof(const Value *V) {
     return V->getValueID() == Value::FunctionVal ||
            V->getValueID() == Value::GlobalVariableVal ||