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the section or the visibility from one global value to another: copyAttributesFrom. This is particularly useful for duplicating functions: previously this was done by explicitly copying each attribute in turn at each place where a new function was created out of an old one, with the result that obscure attributes were regularly forgotten (like the collector or the section). Hopefully now everything is uniform and nothing is forgotten. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51567 91177308-0d34-0410-b5e6-96231b3b80d8
164 lines
6.0 KiB
C++
164 lines
6.0 KiB
C++
//===-- llvm/GlobalVariable.h - GlobalVariable class ------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declaration of the GlobalVariable class, which
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// represents a single global variable (or constant) in the VM.
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//
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// Global variables are constant pointers that refer to hunks of space that are
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// allocated by either the VM, or by the linker in a static compiler. A global
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// variable may have an intial value, which is copied into the executables .data
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// area. Global Constants are required to have initializers.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_GLOBAL_VARIABLE_H
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#define LLVM_GLOBAL_VARIABLE_H
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#include "llvm/GlobalValue.h"
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#include "llvm/OperandTraits.h"
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namespace llvm {
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class Module;
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class Constant;
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class PointerType;
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template<typename ValueSubClass, typename ItemParentClass>
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class SymbolTableListTraits;
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class GlobalVariable : public GlobalValue {
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friend class SymbolTableListTraits<GlobalVariable, Module>;
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void *operator new(size_t, unsigned); // Do not implement
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void operator=(const GlobalVariable &); // Do not implement
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GlobalVariable(const GlobalVariable &); // Do not implement
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void setParent(Module *parent);
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GlobalVariable *Prev, *Next;
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void setNext(GlobalVariable *N) { Next = N; }
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void setPrev(GlobalVariable *N) { Prev = N; }
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bool isConstantGlobal : 1; // Is this a global constant?
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bool isThreadLocalSymbol : 1; // Is this symbol "Thread Local"?
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public:
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// allocate space for exactly one operand
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void *operator new(size_t s) {
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return User::operator new(s, 1);
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}
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/// GlobalVariable ctor - If a parent module is specified, the global is
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/// automatically inserted into the end of the specified modules global list.
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GlobalVariable(const Type *Ty, bool isConstant, LinkageTypes Linkage,
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Constant *Initializer = 0, const std::string &Name = "",
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Module *Parent = 0, bool ThreadLocal = false,
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unsigned AddressSpace = 0);
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/// GlobalVariable ctor - This creates a global and inserts it before the
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/// specified other global.
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GlobalVariable(const Type *Ty, bool isConstant, LinkageTypes Linkage,
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Constant *Initializer, const std::string &Name,
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GlobalVariable *InsertBefore, bool ThreadLocal = false,
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unsigned AddressSpace = 0);
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~GlobalVariable() {
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NumOperands = 1; // FIXME: needed by operator delete
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}
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/// Provide fast operand accessors
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DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
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/// isDeclaration - Is this global variable lacking an initializer? If so,
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/// the global variable is defined in some other translation unit, and is thus
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/// only a declaration here.
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virtual bool isDeclaration() const { return getNumOperands() == 0; }
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/// hasInitializer - Unless a global variable isExternal(), it has an
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/// initializer. The initializer for the global variable/constant is held by
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/// Initializer if an initializer is specified.
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///
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inline bool hasInitializer() const { return !isDeclaration(); }
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/// getInitializer - Return the initializer for this global variable. It is
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/// illegal to call this method if the global is external, because we cannot
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/// tell what the value is initialized to!
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///
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inline /*const FIXME*/ Constant *getInitializer() const {
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assert(hasInitializer() && "GV doesn't have initializer!");
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return static_cast<Constant*>(Op<0>().get());
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}
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inline Constant *getInitializer() {
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assert(hasInitializer() && "GV doesn't have initializer!");
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return static_cast<Constant*>(Op<0>().get());
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}
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inline void setInitializer(Constant *CPV) {
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if (CPV == 0) {
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if (hasInitializer()) {
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Op<0>().set(0);
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NumOperands = 0;
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}
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} else {
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if (!hasInitializer())
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NumOperands = 1;
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Op<0>().set(CPV);
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}
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}
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/// If the value is a global constant, its value is immutable throughout the
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/// runtime execution of the program. Assigning a value into the constant
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/// leads to undefined behavior.
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///
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bool isConstant() const { return isConstantGlobal; }
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void setConstant(bool Val) { isConstantGlobal = Val; }
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/// If the value is "Thread Local", its value isn't shared by the threads.
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bool isThreadLocal() const { return isThreadLocalSymbol; }
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void setThreadLocal(bool Val) { isThreadLocalSymbol = Val; }
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/// copyAttributesFrom - copy all additional attributes (those not needed to
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/// create a GlobalVariable) from the GlobalVariable Src to this one.
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void copyAttributesFrom(const GlobalValue *Src);
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/// removeFromParent - This method unlinks 'this' from the containing module,
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/// but does not delete it.
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///
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void removeFromParent();
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/// eraseFromParent - This method unlinks 'this' from the containing module
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/// and deletes it.
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///
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void eraseFromParent();
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/// Override Constant's implementation of this method so we can
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/// replace constant initializers.
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virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);
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virtual void print(std::ostream &OS) const;
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void print(std::ostream *OS) const { if (OS) print(*OS); }
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const GlobalVariable *) { return true; }
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static inline bool classof(const Value *V) {
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return V->getValueID() == Value::GlobalVariableVal;
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}
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private:
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// getNext/Prev - Return the next or previous global variable in the list.
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GlobalVariable *getNext() { return Next; }
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const GlobalVariable *getNext() const { return Next; }
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GlobalVariable *getPrev() { return Prev; }
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const GlobalVariable *getPrev() const { return Prev; }
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};
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template <>
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struct OperandTraits<GlobalVariable> : OptionalOperandTraits<> {
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};
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DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalVariable, Value)
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} // End llvm namespace
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#endif
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