X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FGlobalValue.h;h=58d02576c17e960ad763c3008a9727ed839c57d4;hb=07b4d5592ac761e48bf712f0dd07281bb7f8ab52;hp=5132d395ef10f8f399f3b2a0ac983b05b81d8bd0;hpb=207855cff9b4811004b9720f28a5bd0adf3784b7;p=oota-llvm.git diff --git a/include/llvm/GlobalValue.h b/include/llvm/GlobalValue.h index 5132d395ef1..58d02576c17 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 { @@ -34,13 +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. - LinkerWeakLinkage, ///< Like linker private, but weak. + 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. @@ -55,30 +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; } @@ -100,8 +104,8 @@ public: bool use_empty_except_constants(); /// getType - Global values are always pointers. - inline const PointerType *getType() const { - return reinterpret_cast(User::getType()); + inline PointerType *getType() const { + return reinterpret_cast(User::getType()); } static LinkageTypes getLinkOnceLinkage(bool ODR) { @@ -118,7 +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; @@ -135,12 +144,12 @@ public: static bool isLinkerPrivateLinkage(LinkageTypes Linkage) { return Linkage == LinkerPrivateLinkage; } - static bool isLinkerWeakLinkage(LinkageTypes Linkage) { - return Linkage == LinkerWeakLinkage; + 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; @@ -155,26 +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); } @@ -184,6 +204,9 @@ public: bool hasLinkOnceLinkage() const { return isLinkOnceLinkage(Linkage); } + bool hasLinkOnceODRAutoHideLinkage() const { + return isLinkOnceODRAutoHideLinkage(Linkage); + } bool hasWeakLinkage() const { return isWeakLinkage(Linkage); } @@ -191,7 +214,9 @@ public: bool hasInternalLinkage() const { return isInternalLinkage(Linkage); } bool hasPrivateLinkage() const { return isPrivateLinkage(Linkage); } bool hasLinkerPrivateLinkage() const { return isLinkerPrivateLinkage(Linkage); } - bool hasLinkerWeakLinkage() const { return isLinkerWeakLinkage(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); } @@ -201,6 +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); } @@ -237,16 +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. @@ -261,12 +286,6 @@ 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) {