X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FGlobalValue.h;h=808471d0a4c37ed44847d5327eb38288628bf9ce;hb=fc82fabe00b0b820e3c0d7fc9e289bace0295f11;hp=a3b3cde85da3b340f03a22c89dec8d0a16dad991;hpb=3aef571287c64b2fad36761050470914fa4a76da;p=oota-llvm.git diff --git a/include/llvm/GlobalValue.h b/include/llvm/GlobalValue.h index a3b3cde85da..808471d0a4c 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. // //===----------------------------------------------------------------------===// @@ -27,23 +28,41 @@ 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) - GhostLinkage /// Stand-in functions for streaming fns from BC files + 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, Use *Ops, unsigned NumOps, LinkageTypes linkage, const std::string &name = "") - : Constant(Ty, vty, Ops, NumOps, name), Linkage(linkage), - Parent(0), Alignment(0) { } + : 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; - unsigned Alignment; + // 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: ~GlobalValue() { removeDeadConstantUsers(); // remove any dead constants using this. @@ -54,6 +73,17 @@ public: 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 @@ -67,20 +97,23 @@ public: return reinterpret_cast(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; } - /// hasNotBeenReadFromBytecode - If a module provider is being used to lazily + /// 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. @@ -89,9 +122,9 @@ public: /// 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... @@ -102,17 +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 method tries to make the global dead. If it detects a user that - /// would prevent it from becoming completely dead, it gives up early, - /// potentially leaving some dead constant users around. void removeDeadConstantUsers(); // 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->getValueType() == Value::FunctionVal || - V->getValueType() == Value::GlobalVariableVal; + return V->getValueID() == Value::FunctionVal || + V->getValueID() == Value::GlobalVariableVal || + V->getValueID() == Value::GlobalAliasVal; } };