lib/Target/ARM/ARMConstantPoolValue.h

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