1//===-- llvm/GlobalObject.h - Class to represent global objects -*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This represents an independent object. That is, a function or a global
11// variable, but not an alias.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_IR_GLOBALOBJECT_H
16#define LLVM_IR_GLOBALOBJECT_H
17
18#include "llvm/IR/Constant.h"
19#include "llvm/IR/DerivedTypes.h"
20#include "llvm/IR/GlobalValue.h"
21
22namespace llvm {
23class Comdat;
24class Module;
25
26class GlobalObject : public GlobalValue {
27  GlobalObject(const GlobalObject &) = delete;
28
29protected:
30  GlobalObject(Type *Ty, ValueTy VTy, Use *Ops, unsigned NumOps,
31               LinkageTypes Linkage, const Twine &Name,
32               unsigned AddressSpace = 0)
33      : GlobalValue(Ty, VTy, Ops, NumOps, Linkage, Name, AddressSpace),
34        ObjComdat(nullptr) {
35    setGlobalValueSubClassData(0);
36  }
37
38  std::string Section;     // Section to emit this into, empty means default
39  Comdat *ObjComdat;
40  static const unsigned AlignmentBits = 5;
41  static const unsigned GlobalObjectSubClassDataBits =
42      GlobalValueSubClassDataBits - AlignmentBits;
43
44private:
45  static const unsigned AlignmentMask = (1 << AlignmentBits) - 1;
46
47public:
48  unsigned getAlignment() const {
49    unsigned Data = getGlobalValueSubClassData();
50    unsigned AlignmentData = Data & AlignmentMask;
51    return (1u << AlignmentData) >> 1;
52  }
53  void setAlignment(unsigned Align);
54
55  unsigned getGlobalObjectSubClassData() const;
56  void setGlobalObjectSubClassData(unsigned Val);
57
58  bool hasSection() const { return !StringRef(getSection()).empty(); }
59  const char *getSection() const { return Section.c_str(); }
60  void setSection(StringRef S);
61
62  bool hasComdat() const { return getComdat() != nullptr; }
63  const Comdat *getComdat() const { return ObjComdat; }
64  Comdat *getComdat() { return ObjComdat; }
65  void setComdat(Comdat *C) { ObjComdat = C; }
66
67  void copyAttributesFrom(const GlobalValue *Src) override;
68
69  // Methods for support type inquiry through isa, cast, and dyn_cast:
70  static inline bool classof(const Value *V) {
71    return V->getValueID() == Value::FunctionVal ||
72           V->getValueID() == Value::GlobalVariableVal;
73  }
74};
75
76} // End llvm namespace
77
78#endif
79