ARMConstantPoolValue.h revision 1d0be15f89cb5056e20e2d24faa8d6afb1573bca 
1//===- ARMConstantPoolValue.h - ARM constantpool value ----------*- 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 file implements the ARM specific constantpool value class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_TARGET_ARM_CONSTANTPOOLVALUE_H
15#define LLVM_TARGET_ARM_CONSTANTPOOLVALUE_H
16
17#include "llvm/CodeGen/MachineConstantPool.h"
18#include <iosfwd>
19
20namespace llvm {
21
22class GlobalValue;
23class LLVMContext;
24
25namespace ARMCP {
26  enum ARMCPKind {
27    CPValue,
28    CPNonLazyPtr,
29    CPStub
30  };
31}
32
33/// ARMConstantPoolValue - ARM specific constantpool value. This is used to
34/// represent PC relative displacement between the address of the load
35/// instruction and the global value being loaded, i.e. (&GV-(LPIC+8)).
36class ARMConstantPoolValue : public MachineConstantPoolValue {
37  GlobalValue *GV;         // GlobalValue being loaded.
38  const char *S;           // ExtSymbol being loaded.
39  unsigned LabelId;        // Label id of the load.
40  ARMCP::ARMCPKind Kind;   // non_lazy_ptr or stub?
41  unsigned char PCAdjust;  // Extra adjustment if constantpool is pc relative.
42                           // 8 for ARM, 4 for Thumb.
43  const char *Modifier;    // GV modifier i.e. (&GV(modifier)-(LPIC+8))
44  bool AddCurrentAddress;
45
46public:
47  ARMConstantPoolValue(GlobalValue *gv, unsigned id,
48                       ARMCP::ARMCPKind Kind = ARMCP::CPValue,
49                       unsigned char PCAdj = 0, const char *Modifier = NULL,
50                       bool AddCurrentAddress = false);
51  ARMConstantPoolValue(LLVMContext &C, const char *s, unsigned id,
52                       ARMCP::ARMCPKind Kind = ARMCP::CPValue,
53                       unsigned char PCAdj = 0, const char *Modifier = NULL,
54                       bool AddCurrentAddress = false);
55  ARMConstantPoolValue(GlobalValue *GV, ARMCP::ARMCPKind Kind,
56                       const char *Modifier);
57  ARMConstantPoolValue();
58  ~ARMConstantPoolValue();
59
60
61  GlobalValue *getGV() const { return GV; }
62  const char *getSymbol() const { return S; }
63  const char *getModifier() const { return Modifier; }
64  bool hasModifier() const { return Modifier != NULL; }
65  bool mustAddCurrentAddress() const { return AddCurrentAddress; }
66  unsigned getLabelId() const { return LabelId; }
67  bool isNonLazyPointer() const { return Kind == ARMCP::CPNonLazyPtr; }
68  bool isStub() const { return Kind == ARMCP::CPStub; }
69  unsigned char getPCAdjustment() const { return PCAdjust; }
70
71  virtual unsigned getRelocationInfo() const {
72    // FIXME: This is conservatively claiming that these entries require a
73    // relocation, we may be able to do better than this.
74    return 2;
75  }
76
77
78  virtual int getExistingMachineCPValue(MachineConstantPool *CP,
79                                        unsigned Alignment);
80
81  virtual void AddSelectionDAGCSEId(FoldingSetNodeID &ID);
82
83  void print(std::ostream *O) const { if (O) print(*O); }
84  void print(std::ostream &O) const;
85  void print(raw_ostream *O) const { if (O) print(*O); }
86  void print(raw_ostream &O) const;
87  void dump() const;
88};
89
90inline std::ostream &operator<<(std::ostream &O,
91                                const ARMConstantPoolValue &V) {
92  V.print(O);
93  return O;
94}
95
96inline raw_ostream &operator<<(raw_ostream &O, const ARMConstantPoolValue &V) {
97  V.print(O);
98  return O;
99}
100
101} // End llvm namespace
102
103#endif
104