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1 //===- llvm/GlobalIndirectSymbol.h - GlobalIndirectSymbol class -*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file contains the declaration of the GlobalIndirectSymbol class, which
10 // is a base class for GlobalAlias and GlobalIFunc. It contains all common code
11 // for aliases and ifuncs.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #ifndef LLVM_IR_GLOBALINDIRECTSYMBOL_H
16 #define LLVM_IR_GLOBALINDIRECTSYMBOL_H
17
18 #include "llvm/IR/GlobalObject.h"
19 #include "llvm/IR/GlobalValue.h"
20 #include "llvm/IR/OperandTraits.h"
21 #include "llvm/IR/User.h"
22 #include "llvm/IR/Value.h"
23 #include "llvm/Support/Casting.h"
24 #include <cstddef>
25
26 namespace llvm {
27
28 class GlobalIndirectSymbol : public GlobalValue {
29 protected:
30   GlobalIndirectSymbol(Type *Ty, ValueTy VTy, unsigned AddressSpace,
31       LinkageTypes Linkage, const Twine &Name, Constant *Symbol);
32
33 public:
34   GlobalIndirectSymbol(const GlobalIndirectSymbol &) = delete;
35   GlobalIndirectSymbol &operator=(const GlobalIndirectSymbol &) = delete;
36
37   // allocate space for exactly one operand
38   void *operator new(size_t s) {
39     return User::operator new(s, 1);
40   }
41
42   /// Provide fast operand accessors
43   DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Constant);
44
45   void copyAttributesFrom(const GlobalValue *Src) {
46     GlobalValue::copyAttributesFrom(Src);
47   }
48
49   /// These methods set and retrieve indirect symbol.
50   void setIndirectSymbol(Constant *Symbol) {
51     setOperand(0, Symbol);
52   }
53   const Constant *getIndirectSymbol() const {
54     return getOperand(0);
55   }
56   Constant *getIndirectSymbol() {
57     return const_cast<Constant *>(
58           static_cast<const GlobalIndirectSymbol *>(this)->getIndirectSymbol());
59   }
60
61   const GlobalObject *getBaseObject() const;
62   GlobalObject *getBaseObject() {
63     return const_cast<GlobalObject *>(
64               static_cast<const GlobalIndirectSymbol *>(this)->getBaseObject());
65   }
66
67   const GlobalObject *getBaseObject(const DataLayout &DL, APInt &Offset) const {
68     return dyn_cast<GlobalObject>(
69         getIndirectSymbol()->stripAndAccumulateInBoundsConstantOffsets(DL,
70                                                                        Offset));
71   }
72   GlobalObject *getBaseObject(const DataLayout &DL, APInt &Offset) {
73     return const_cast<GlobalObject *>(
74                                  static_cast<const GlobalIndirectSymbol *>(this)
75                                    ->getBaseObject(DL, Offset));
76   }
77
78   // Methods for support type inquiry through isa, cast, and dyn_cast:
79   static bool classof(const Value *V) {
80     return V->getValueID() == Value::GlobalAliasVal ||
81            V->getValueID() == Value::GlobalIFuncVal;
82   }
83 };
84
85 template <>
86 struct OperandTraits<GlobalIndirectSymbol> :
87   public FixedNumOperandTraits<GlobalIndirectSymbol, 1> {
88 };
89
90 DEFINE_TRANSPARENT_OPERAND_ACCESSORS(GlobalIndirectSymbol, Constant)
91
92 } // end namespace llvm
93
94 #endif // LLVM_IR_GLOBALINDIRECTSYMBOL_H