/usr/include/llvm-3.9/llvm/IR/GlobalVariable.h is in llvm-3.9-dev 1:3.9.1-19ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 | //===-- 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/Twine.h"
#include "llvm/ADT/ilist_node.h"
#include "llvm/IR/GlobalObject.h"
#include "llvm/IR/OperandTraits.h"
namespace llvm {
class Module;
class Constant;
template <typename ValueSubClass> class SymbolTableListTraits;
class GlobalVariable : public GlobalObject, public ilist_node<GlobalVariable> {
friend class SymbolTableListTraits<GlobalVariable>;
void *operator new(size_t, unsigned) = delete;
void operator=(const GlobalVariable &) = delete;
GlobalVariable(const GlobalVariable &) = delete;
void setParent(Module *parent);
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:
// allocate space for exactly one operand
void *operator new(size_t s) {
return User::operator new(s, 1);
}
/// 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() override {
dropAllReferences();
// FIXME: needed by operator delete
setGlobalVariableNumOperands(1);
}
/// 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 GlobalValue *Src) override;
/// removeFromParent - This method unlinks 'this' from the containing module,
/// but does not delete it.
///
void removeFromParent() override;
/// eraseFromParent - This method unlinks 'this' from the containing module
/// and deletes it.
///
void eraseFromParent() override;
/// 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();
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const Value *V) {
return V->getValueID() == Value::GlobalVariableVal;
}
};
template <>
struct OperandTraits<GlobalVariable> :
public OptionalOperandTraits<GlobalVariable> {
};
DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalVariable, Value)
} // End llvm namespace
#endif
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