ARMConstantPoolValue.h revision 4ee451de366474b9c228b4e5fa573795a715216d 
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
19namespace llvm {
20
21namespace ARMCP {
22  enum ARMCPKind {
23    CPValue,
24    CPNonLazyPtr,
25    CPStub
26  };
27}
28
29/// ARMConstantPoolValue - ARM specific constantpool value. This is used to
30/// represent PC relative displacement between the address of the load
31/// instruction and the global value being loaded, i.e. (&GV-(LPIC+8)).
32class ARMConstantPoolValue : public MachineConstantPoolValue {
33  GlobalValue *GV;         // GlobalValue being loaded.
34  const char *S;           // ExtSymbol being loaded.
35  unsigned LabelId;        // Label id of the load.
36  ARMCP::ARMCPKind Kind;   // non_lazy_ptr or stub?
37  unsigned char PCAdjust;  // Extra adjustment if constantpool is pc relative.
38                           // 8 for ARM, 4 for Thumb.
39  const char *Modifier;    // GV modifier i.e. (&GV(modifier)-(LPIC+8))
40  bool AddCurrentAddress;
41
42public:
43  ARMConstantPoolValue(GlobalValue *gv, unsigned id,
44                       ARMCP::ARMCPKind Kind = ARMCP::CPValue,
45                       unsigned char PCAdj = 0, const char *Modifier = NULL,
46                       bool AddCurrentAddress = false);
47  ARMConstantPoolValue(const char *s, unsigned id,
48                       ARMCP::ARMCPKind Kind = ARMCP::CPValue,
49                       unsigned char PCAdj = 0, const char *Modifier = NULL,
50                       bool AddCurrentAddress = false);
51  ARMConstantPoolValue(GlobalValue *GV, ARMCP::ARMCPKind Kind,
52                       const char *Modifier);
53
54
55  GlobalValue *getGV() const { return GV; }
56  const char *getSymbol() const { return S; }
57  const char *getModifier() const { return Modifier; }
58  bool hasModifier() const { return Modifier != NULL; }
59  bool mustAddCurrentAddress() const { return AddCurrentAddress; }
60  unsigned getLabelId() const { return LabelId; }
61  bool isNonLazyPointer() const { return Kind == ARMCP::CPNonLazyPtr; }
62  bool isStub() const { return Kind == ARMCP::CPStub; }
63  unsigned char getPCAdjustment() const { return PCAdjust; }
64
65  virtual int getExistingMachineCPValue(MachineConstantPool *CP,
66                                        unsigned Alignment);
67
68  virtual void AddSelectionDAGCSEId(FoldingSetNodeID &ID);
69
70  virtual void print(std::ostream &O) const;
71};
72
73}
74
75#endif
76