+ /// hasInitializer - Unless a global variable isExternal(), it has an
+ /// initializer. The initializer for the global variable/constant is held by
+ /// Initializer if an initializer is specified.
+ ///
+ 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 with weak linkage may change at
+ // link time.
+ !mayBeOverridden();
+ }
+
+ /// 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 hasInitializer() &&
+ // It's not safe to modify initializers of global variables with weak
+ // linkage, because the linker might choose to discard the initializer and
+ // use the initializer from another instance of the global variable
+ // instead. It is wrong to modify the initializer of a global variable
+ // with *_odr linkage because then different instances of the global may
+ // have different initializers, breaking the One Definition Rule.
+ !isWeakForLinker();
+ }
+
+ /// 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; }
+
+ /// If the value is "Thread Local", its value isn't shared by the threads.
+ bool isThreadLocal() const { return threadLocalMode != NotThreadLocal; }
+ void setThreadLocal(bool Val) {
+ threadLocalMode = Val ? GeneralDynamicTLSModel : NotThreadLocal;
+ }
+ void setThreadLocalMode(ThreadLocalMode Val) { threadLocalMode = Val; }
+ ThreadLocalMode getThreadLocalMode() const {
+ return static_cast<ThreadLocalMode>(threadLocalMode);
+ }
+
+ /// copyAttributesFrom - copy all additional attributes (those not needed to
+ /// create a GlobalVariable) from the GlobalVariable Src to this one.
+ void copyAttributesFrom(const GlobalValue *Src);
+
+ /// removeFromParent - This method unlinks 'this' from the containing module,
+ /// but does not delete it.
+ ///
+ virtual void removeFromParent();
+
+ /// eraseFromParent - This method unlinks 'this' from the containing module
+ /// and deletes it.
+ ///
+ virtual void eraseFromParent();
+
+ /// Override Constant's implementation of this method so we can
+ /// replace constant initializers.
+ virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);