X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FGlobalValue.h;h=69995e19caac7685ee2e90b17019ed61a87cc1ac;hb=ac7d2955422e4fb4f84ac7a1c4eaa216c7851713;hp=9875a833100b79b8b2ec5b95fe61c1b562a0c04c;hpb=5a96f93573439be771ce9609fa2a5754c94485b6;p=oota-llvm.git diff --git a/include/llvm/GlobalValue.h b/include/llvm/GlobalValue.h index 9875a833100..69995e19caa 100644 --- a/include/llvm/GlobalValue.h +++ b/include/llvm/GlobalValue.h @@ -40,10 +40,12 @@ public: 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. + LinkerPrivateWeakDefAutoLinkage, ///< Like LinkerPrivateWeak, but possibly + /// hidden. 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. CommonLinkage ///< Tentative definitions. }; @@ -58,7 +60,8 @@ protected: GlobalValue(const 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) { + Linkage(linkage), Visibility(DefaultVisibility), Alignment(0), + UnnamedAddr(0) { setName(Name); } @@ -68,17 +71,20 @@ protected: 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 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; } @@ -93,15 +99,15 @@ public: void setSection(StringRef 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 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 /// for transitively dead constants. 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) { @@ -111,65 +117,146 @@ public: return ODR ? WeakODRLinkage : WeakAnyLinkage; } - bool hasExternalLinkage() const { return Linkage == ExternalLinkage; } - bool hasAvailableExternallyLinkage() const { + static bool isExternalLinkage(LinkageTypes Linkage) { + return Linkage == ExternalLinkage; + } + static bool isAvailableExternallyLinkage(LinkageTypes Linkage) { return Linkage == AvailableExternallyLinkage; } - bool hasLinkOnceLinkage() const { + static bool isLinkOnceLinkage(LinkageTypes Linkage) { return Linkage == LinkOnceAnyLinkage || Linkage == LinkOnceODRLinkage; } - bool hasWeakLinkage() const { + static bool isWeakLinkage(LinkageTypes Linkage) { return Linkage == WeakAnyLinkage || Linkage == WeakODRLinkage; } - bool hasAppendingLinkage() const { return Linkage == AppendingLinkage; } - bool hasInternalLinkage() const { return Linkage == InternalLinkage; } - bool hasPrivateLinkage() const { return Linkage == PrivateLinkage; } - bool hasLinkerPrivateLinkage() const { return Linkage==LinkerPrivateLinkage; } - bool hasLocalLinkage() const { - return hasInternalLinkage() || hasPrivateLinkage() || - hasLinkerPrivateLinkage(); + static bool isAppendingLinkage(LinkageTypes Linkage) { + return Linkage == AppendingLinkage; + } + static bool isInternalLinkage(LinkageTypes Linkage) { + return Linkage == InternalLinkage; + } + static bool isPrivateLinkage(LinkageTypes Linkage) { + return Linkage == PrivateLinkage; + } + static bool isLinkerPrivateLinkage(LinkageTypes Linkage) { + return Linkage == LinkerPrivateLinkage; + } + static bool isLinkerPrivateWeakLinkage(LinkageTypes Linkage) { + return Linkage == LinkerPrivateWeakLinkage; + } + static bool isLinkerPrivateWeakDefAutoLinkage(LinkageTypes Linkage) { + return Linkage == LinkerPrivateWeakDefAutoLinkage; + } + static bool isLocalLinkage(LinkageTypes Linkage) { + return isInternalLinkage(Linkage) || isPrivateLinkage(Linkage) || + isLinkerPrivateLinkage(Linkage) || isLinkerPrivateWeakLinkage(Linkage) || + isLinkerPrivateWeakDefAutoLinkage(Linkage); + } + static bool isDLLImportLinkage(LinkageTypes Linkage) { + return Linkage == DLLImportLinkage; + } + static bool isDLLExportLinkage(LinkageTypes Linkage) { + return Linkage == DLLExportLinkage; + } + static bool isExternalWeakLinkage(LinkageTypes Linkage) { + return Linkage == ExternalWeakLinkage; + } + static bool isCommonLinkage(LinkageTypes Linkage) { + return Linkage == CommonLinkage; } - 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; } /// 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); + static bool mayBeOverridden(LinkageTypes Linkage) { + return Linkage == WeakAnyLinkage || + Linkage == LinkOnceAnyLinkage || + Linkage == CommonLinkage || + Linkage == ExternalWeakLinkage || + Linkage == LinkerPrivateWeakLinkage || + Linkage == LinkerPrivateWeakDefAutoLinkage; } /// 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); + /// 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 || + Linkage == LinkerPrivateWeakLinkage || + Linkage == LinkerPrivateWeakDefAutoLinkage; + } + + bool hasExternalLinkage() const { return isExternalLinkage(Linkage); } + bool hasAvailableExternallyLinkage() const { + return isAvailableExternallyLinkage(Linkage); + } + bool hasLinkOnceLinkage() const { + return isLinkOnceLinkage(Linkage); + } + bool hasWeakLinkage() const { + return isWeakLinkage(Linkage); + } + bool hasAppendingLinkage() const { return isAppendingLinkage(Linkage); } + 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 hasLinkerPrivateWeakDefAutoLinkage() const { + return isLinkerPrivateWeakDefAutoLinkage(Linkage); } + bool hasLocalLinkage() const { return isLocalLinkage(Linkage); } + bool hasDLLImportLinkage() const { return isDLLImportLinkage(Linkage); } + bool hasDLLExportLinkage() const { return isDLLExportLinkage(Linkage); } + bool hasExternalWeakLinkage() const { return isExternalWeakLinkage(Linkage); } + bool hasCommonLinkage() const { return isCommonLinkage(Linkage); } + + void setLinkage(LinkageTypes LT) { Linkage = LT; } + LinkageTypes getLinkage() const { return Linkage; } + + bool mayBeOverridden() const { return mayBeOverridden(Linkage); } + + bool isWeakForLinker() const { return isWeakForLinker(Linkage); } /// 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 hasNotBeenReadFromBitcode() const { return Linkage == GhostLinkage; } +/// @name Materialization +/// Materialization is used to construct functions only as they're needed. This +/// is useful to reduce memory usage in LLVM or parsing work done by the +/// BitcodeReader to load the Module. +/// @{ + + /// isMaterializable - If this function's Module is being lazily streamed in + /// functions from disk or some other source, this method can be used to check + /// to see if the function has been read in yet or not. + bool isMaterializable() const; + + /// isDematerializable - Returns true if this function was loaded from a + /// GVMaterializer that's still attached to its Module and that knows how to + /// dematerialize the function. + bool isDematerializable() const; + + /// Materialize - make sure this GlobalValue is fully read. If the module is + /// corrupt, this returns true and fills in the optional string with + /// information about the problem. If successful, this returns false. + bool Materialize(std::string *ErrInfo = 0); + + /// Dematerialize - If this GlobalValue is read in, and if the GVMaterializer + /// supports it, release the memory for the function, and set it up to be + /// materialized lazily. If !isDematerializable(), this method is a noop. + void Dematerialize(); + +/// @} /// Override from Constant class. No GlobalValue's are null values so this /// always returns false. @@ -195,12 +282,6 @@ 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) {