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+//===-- llvm/GlobalVariable.h - GlobalVariable class ------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the declaration of the GlobalVariable class, which
+// represents a single global variable (or constant) in the VM.
+//
+// Global variables are constant pointers that refer to hunks of space that are
+// allocated by either the VM, or by the linker in a static compiler. A global
+// variable may have an initial value, which is copied into the executables .data
+// area. Global Constants are required to have initializers.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_GLOBALVARIABLE_H
+#define LLVM_IR_GLOBALVARIABLE_H
+
+#include "llvm/ADT/PointerUnion.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/ADT/ilist_node.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/GlobalObject.h"
+#include "llvm/IR/OperandTraits.h"
+#include "llvm/IR/Value.h"
+#include <cassert>
+#include <cstddef>
+
+namespace llvm {
+
+class Constant;
+class Module;
+
+template <typename ValueSubClass> class SymbolTableListTraits;
+class DIGlobalVariable;
+class DIGlobalVariableExpression;
+
+class GlobalVariable : public GlobalObject, public ilist_node<GlobalVariable> {
+ friend class SymbolTableListTraits<GlobalVariable>;
+
+ AttributeSet Attrs;
+ bool isConstantGlobal : 1; // Is this a global constant?
+ bool isExternallyInitializedConstant : 1; // Is this a global whose value
+ // can change from its initial
+ // value before global
+ // initializers are run?
+
+public:
+ /// GlobalVariable ctor - If a parent module is specified, the global is
+ /// automatically inserted into the end of the specified modules global list.
+ GlobalVariable(Type *Ty, bool isConstant, LinkageTypes Linkage,
+ Constant *Initializer = nullptr, const Twine &Name = "",
+ ThreadLocalMode = NotThreadLocal, unsigned AddressSpace = 0,
+ bool isExternallyInitialized = false);
+ /// GlobalVariable ctor - This creates a global and inserts it before the
+ /// specified other global.
+ GlobalVariable(Module &M, Type *Ty, bool isConstant,
+ LinkageTypes Linkage, Constant *Initializer,
+ const Twine &Name = "", GlobalVariable *InsertBefore = nullptr,
+ ThreadLocalMode = NotThreadLocal, unsigned AddressSpace = 0,
+ bool isExternallyInitialized = false);
+ GlobalVariable(const GlobalVariable &) = delete;
+ GlobalVariable &operator=(const GlobalVariable &) = delete;
+
+ ~GlobalVariable() {
+ dropAllReferences();
+ }
+
+ // allocate space for exactly one operand
+ void *operator new(size_t s) {
+ return User::operator new(s, 1);
+ }
+
+ // delete space for exactly one operand as created in the corresponding new operator
+ void operator delete(void *ptr){
+ assert(ptr != nullptr && "must not be nullptr");
+ User *Obj = static_cast<User *>(ptr);
+ // Number of operands can be set to 0 after construction and initialization. Make sure
+ // that number of operands is reset to 1, as this is needed in User::operator delete
+ Obj->setGlobalVariableNumOperands(1);
+ User::operator delete(Obj);
+ }
+
+ /// Provide fast operand accessors
+ DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
+
+ /// Definitions have initializers, declarations don't.
+ ///
+ inline bool hasInitializer() const { return !isDeclaration(); }
+
+ /// hasDefinitiveInitializer - Whether the global variable has an initializer,
+ /// and any other instances of the global (this can happen due to weak
+ /// linkage) are guaranteed to have the same initializer.
+ ///
+ /// Note that if you want to transform a global, you must use
+ /// hasUniqueInitializer() instead, because of the *_odr linkage type.
+ ///
+ /// Example:
+ ///
+ /// @a = global SomeType* null - Initializer is both definitive and unique.
+ ///
+ /// @b = global weak SomeType* null - Initializer is neither definitive nor
+ /// unique.
+ ///
+ /// @c = global weak_odr SomeType* null - Initializer is definitive, but not
+ /// unique.
+ inline bool hasDefinitiveInitializer() const {
+ return hasInitializer() &&
+ // The initializer of a global variable may change to something arbitrary
+ // at link time.
+ !isInterposable() &&
+ // The initializer of a global variable with the externally_initialized
+ // marker may change at runtime before C++ initializers are evaluated.
+ !isExternallyInitialized();
+ }
+
+ /// hasUniqueInitializer - Whether the global variable has an initializer, and
+ /// any changes made to the initializer will turn up in the final executable.
+ inline bool hasUniqueInitializer() const {
+ return
+ // We need to be sure this is the definition that will actually be used
+ isStrongDefinitionForLinker() &&
+ // It is not safe to modify initializers of global variables with the
+ // external_initializer marker since the value may be changed at runtime
+ // before C++ initializers are evaluated.
+ !isExternallyInitialized();
+ }
+
+ /// getInitializer - Return the initializer for this global variable. It is
+ /// illegal to call this method if the global is external, because we cannot
+ /// tell what the value is initialized to!
+ ///
+ inline const Constant *getInitializer() const {
+ assert(hasInitializer() && "GV doesn't have initializer!");
+ return static_cast<Constant*>(Op<0>().get());
+ }
+ inline Constant *getInitializer() {
+ assert(hasInitializer() && "GV doesn't have initializer!");
+ return static_cast<Constant*>(Op<0>().get());
+ }
+ /// setInitializer - Sets the initializer for this global variable, removing
+ /// any existing initializer if InitVal==NULL. If this GV has type T*, the
+ /// initializer must have type T.
+ void setInitializer(Constant *InitVal);
+
+ /// If the value is a global constant, its value is immutable throughout the
+ /// runtime execution of the program. Assigning a value into the constant
+ /// leads to undefined behavior.
+ ///
+ bool isConstant() const { return isConstantGlobal; }
+ void setConstant(bool Val) { isConstantGlobal = Val; }
+
+ bool isExternallyInitialized() const {
+ return isExternallyInitializedConstant;
+ }
+ void setExternallyInitialized(bool Val) {
+ isExternallyInitializedConstant = Val;
+ }
+
+ /// copyAttributesFrom - copy all additional attributes (those not needed to
+ /// create a GlobalVariable) from the GlobalVariable Src to this one.
+ void copyAttributesFrom(const GlobalVariable *Src);
+
+ /// removeFromParent - This method unlinks 'this' from the containing module,
+ /// but does not delete it.
+ ///
+ void removeFromParent();
+
+ /// eraseFromParent - This method unlinks 'this' from the containing module
+ /// and deletes it.
+ ///
+ void eraseFromParent();
+
+ /// Drop all references in preparation to destroy the GlobalVariable. This
+ /// drops not only the reference to the initializer but also to any metadata.
+ void dropAllReferences();
+
+ /// Attach a DIGlobalVariableExpression.
+ void addDebugInfo(DIGlobalVariableExpression *GV);
+
+ /// Fill the vector with all debug info attachements.
+ void getDebugInfo(SmallVectorImpl<DIGlobalVariableExpression *> &GVs) const;
+
+ /// Add attribute to this global.
+ void addAttribute(Attribute::AttrKind Kind) {
+ Attrs = Attrs.addAttribute(getContext(), Kind);
+ }
+
+ /// Add attribute to this global.
+ void addAttribute(StringRef Kind, StringRef Val = StringRef()) {
+ Attrs = Attrs.addAttribute(getContext(), Kind, Val);
+ }
+
+ /// Return true if the attribute exists.
+ bool hasAttribute(Attribute::AttrKind Kind) const {
+ return Attrs.hasAttribute(Kind);
+ }
+
+ /// Return true if the attribute exists.
+ bool hasAttribute(StringRef Kind) const {
+ return Attrs.hasAttribute(Kind);
+ }
+
+ /// Return true if any attributes exist.
+ bool hasAttributes() const {
+ return Attrs.hasAttributes();
+ }
+
+ /// Return the attribute object.
+ Attribute getAttribute(Attribute::AttrKind Kind) const {
+ return Attrs.getAttribute(Kind);
+ }
+
+ /// Return the attribute object.
+ Attribute getAttribute(StringRef Kind) const {
+ return Attrs.getAttribute(Kind);
+ }
+
+ /// Return the attribute set for this global
+ AttributeSet getAttributes() const {
+ return Attrs;
+ }
+
+ /// Return attribute set as list with index.
+ /// FIXME: This may not be required once ValueEnumerators
+ /// in bitcode-writer can enumerate attribute-set.
+ AttributeList getAttributesAsList(unsigned index) const {
+ if (!hasAttributes())
+ return AttributeList();
+ std::pair<unsigned, AttributeSet> AS[1] = {{index, Attrs}};
+ return AttributeList::get(getContext(), AS);
+ }
+
+ /// Set attribute list for this global
+ void setAttributes(AttributeSet A) {
+ Attrs = A;
+ }
+
+ /// Check if section name is present
+ bool hasImplicitSection() const {
+ return getAttributes().hasAttribute("bss-section") ||
+ getAttributes().hasAttribute("data-section") ||
+ getAttributes().hasAttribute("rodata-section");
+ }
+
+ // Methods for support type inquiry through isa, cast, and dyn_cast:
+ static bool classof(const Value *V) {
+ return V->getValueID() == Value::GlobalVariableVal;
+ }
+};
+
+template <>
+struct OperandTraits<GlobalVariable> :
+ public OptionalOperandTraits<GlobalVariable> {
+};
+
+DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalVariable, Value)
+
+} // end namespace llvm
+
+#endif // LLVM_IR_GLOBALVARIABLE_H