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