lib/Target/ARM/ARMMachineFunctionInfo.h

   1 //====- ARMMachineFuctionInfo.h - ARM machine function info -----*- 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 declares ARM-specific per-machine-function information.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef ARMMACHINEFUNCTIONINFO_H
  15 #define ARMMACHINEFUNCTIONINFO_H
  16
  17 #include "ARMSubtarget.h"
  18 #include "llvm/CodeGen/MachineFunction.h"
  19 #include "llvm/Target/TargetRegisterInfo.h"
  20 #include "llvm/Target/TargetMachine.h"
  21 #include "llvm/ADT/BitVector.h"
  22
  23 namespace llvm {
  24
  25 /// ARMFunctionInfo - This class is derived from MachineFunctionInfo and
  26 /// contains private ARM-specific information for each MachineFunction.
  27 class ARMFunctionInfo : public MachineFunctionInfo {
  28
  29   /// isThumb - True if this function is compiled under Thumb mode.
  30   /// Used to initialized Align, so must precede it.
  31   bool isThumb;
  32
  33   /// hasThumb2 - True if the target architecture supports Thumb2. Do not use
  34   /// to determine if function is compiled under Thumb mode, for that use
  35   /// 'isThumb'.
  36   bool hasThumb2;
  37
  38   /// VarArgsRegSaveSize - Size of the register save area for vararg functions.
  39   ///
  40   unsigned VarArgsRegSaveSize;
  41
  42   /// HasStackFrame - True if this function has a stack frame. Set by
  43   /// processFunctionBeforeCalleeSavedScan().
  44   bool HasStackFrame;
  45
  46   /// RestoreSPFromFP - True if epilogue should restore SP from FP. Set by
  47   /// emitPrologue.
  48   bool RestoreSPFromFP;
  49
  50   /// LRSpilledForFarJump - True if the LR register has been for spilled to
  51   /// enable far jump.
  52   bool LRSpilledForFarJump;
  53
  54   /// FramePtrSpillOffset - If HasStackFrame, this records the frame pointer
  55   /// spill stack offset.
  56   unsigned FramePtrSpillOffset;
  57
  58   /// GPRCS1Offset, GPRCS2Offset, DPRCSOffset - Starting offset of callee saved
  59   /// register spills areas. For Mac OS X:
  60   ///
  61   /// GPR callee-saved (1) : r4, r5, r6, r7, lr
  62   /// --------------------------------------------
  63   /// GPR callee-saved (2) : r8, r10, r11
  64   /// --------------------------------------------
  65   /// DPR callee-saved : d8 - d15
  66   unsigned GPRCS1Offset;
  67   unsigned GPRCS2Offset;
  68   unsigned DPRCSOffset;
  69
  70   /// GPRCS1Size, GPRCS2Size, DPRCSSize - Sizes of callee saved register spills
  71   /// areas.
  72   unsigned GPRCS1Size;
  73   unsigned GPRCS2Size;
  74   unsigned DPRCSSize;
  75
  76   /// GPRCS1Frames, GPRCS2Frames, DPRCSFrames - Keeps track of frame indices
  77   /// which belong to these spill areas.
  78   BitVector GPRCS1Frames;
  79   BitVector GPRCS2Frames;
  80   BitVector DPRCSFrames;
  81
  82   /// JumpTableUId - Unique id for jumptables.
  83   ///
  84   unsigned JumpTableUId;
  85
  86   unsigned PICLabelUId;
  87
  88   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
  89   int VarArgsFrameIndex;
  90
  91   /// HasITBlocks - True if IT blocks have been inserted.
  92   bool HasITBlocks;
  93
  94   /// CPEClones - Track constant pool entries clones created by Constant Island
  95   /// pass.
  96   DenseMap<unsigned, unsigned> CPEClones;
  97
  98 public:
  99   ARMFunctionInfo() :
 100     isThumb(false),
 101     hasThumb2(false),
 102     VarArgsRegSaveSize(0), HasStackFrame(false), RestoreSPFromFP(false),
 103     LRSpilledForFarJump(false),
 104     FramePtrSpillOffset(0), GPRCS1Offset(0), GPRCS2Offset(0), DPRCSOffset(0),
 105     GPRCS1Size(0), GPRCS2Size(0), DPRCSSize(0),
 106     GPRCS1Frames(0), GPRCS2Frames(0), DPRCSFrames(0),
 107     JumpTableUId(0), PICLabelUId(0),
 108     VarArgsFrameIndex(0), HasITBlocks(false) {}
 109
 110   explicit ARMFunctionInfo(MachineFunction &MF) :
 111     isThumb(MF.getTarget().getSubtarget<ARMSubtarget>().isThumb()),
 112     hasThumb2(MF.getTarget().getSubtarget<ARMSubtarget>().hasThumb2()),
 113     VarArgsRegSaveSize(0), HasStackFrame(false), RestoreSPFromFP(false),
 114     LRSpilledForFarJump(false),
 115     FramePtrSpillOffset(0), GPRCS1Offset(0), GPRCS2Offset(0), DPRCSOffset(0),
 116     GPRCS1Size(0), GPRCS2Size(0), DPRCSSize(0),
 117     GPRCS1Frames(32), GPRCS2Frames(32), DPRCSFrames(32),
 118     JumpTableUId(0), PICLabelUId(0),
 119     VarArgsFrameIndex(0), HasITBlocks(false) {}
 120
 121   bool isThumbFunction() const { return isThumb; }
 122   bool isThumb1OnlyFunction() const { return isThumb && !hasThumb2; }
 123   bool isThumb2Function() const { return isThumb && hasThumb2; }
 124
 125   unsigned getVarArgsRegSaveSize() const { return VarArgsRegSaveSize; }
 126   void setVarArgsRegSaveSize(unsigned s) { VarArgsRegSaveSize = s; }
 127
 128   bool hasStackFrame() const { return HasStackFrame; }
 129   void setHasStackFrame(bool s) { HasStackFrame = s; }
 130
 131   bool shouldRestoreSPFromFP() const { return RestoreSPFromFP; }
 132   void setShouldRestoreSPFromFP(bool s) { RestoreSPFromFP = s; }
 133
 134   bool isLRSpilledForFarJump() const { return LRSpilledForFarJump; }
 135   void setLRIsSpilledForFarJump(bool s) { LRSpilledForFarJump = s; }
 136
 137   unsigned getFramePtrSpillOffset() const { return FramePtrSpillOffset; }
 138   void setFramePtrSpillOffset(unsigned o) { FramePtrSpillOffset = o; }
 139
 140   unsigned getGPRCalleeSavedArea1Offset() const { return GPRCS1Offset; }
 141   unsigned getGPRCalleeSavedArea2Offset() const { return GPRCS2Offset; }
 142   unsigned getDPRCalleeSavedAreaOffset()  const { return DPRCSOffset; }
 143
 144   void setGPRCalleeSavedArea1Offset(unsigned o) { GPRCS1Offset = o; }
 145   void setGPRCalleeSavedArea2Offset(unsigned o) { GPRCS2Offset = o; }
 146   void setDPRCalleeSavedAreaOffset(unsigned o)  { DPRCSOffset = o; }
 147
 148   unsigned getGPRCalleeSavedArea1Size() const { return GPRCS1Size; }
 149   unsigned getGPRCalleeSavedArea2Size() const { return GPRCS2Size; }
 150   unsigned getDPRCalleeSavedAreaSize()  const { return DPRCSSize; }
 151
 152   void setGPRCalleeSavedArea1Size(unsigned s) { GPRCS1Size = s; }
 153   void setGPRCalleeSavedArea2Size(unsigned s) { GPRCS2Size = s; }
 154   void setDPRCalleeSavedAreaSize(unsigned s)  { DPRCSSize = s; }
 155
 156   bool isGPRCalleeSavedArea1Frame(int fi) const {
 157     if (fi < 0 || fi >= (int)GPRCS1Frames.size())
 158       return false;
 159     return GPRCS1Frames[fi];
 160   }
 161   bool isGPRCalleeSavedArea2Frame(int fi) const {
 162     if (fi < 0 || fi >= (int)GPRCS2Frames.size())
 163       return false;
 164     return GPRCS2Frames[fi];
 165   }
 166   bool isDPRCalleeSavedAreaFrame(int fi) const {
 167     if (fi < 0 || fi >= (int)DPRCSFrames.size())
 168       return false;
 169     return DPRCSFrames[fi];
 170   }
 171
 172   void addGPRCalleeSavedArea1Frame(int fi) {
 173     if (fi >= 0) {
 174       int Size = GPRCS1Frames.size();
 175       if (fi >= Size) {
 176         Size *= 2;
 177         if (fi >= Size)
 178           Size = fi+1;
 179         GPRCS1Frames.resize(Size);
 180       }
 181       GPRCS1Frames[fi] = true;
 182     }
 183   }
 184   void addGPRCalleeSavedArea2Frame(int fi) {
 185     if (fi >= 0) {
 186       int Size = GPRCS2Frames.size();
 187       if (fi >= Size) {
 188         Size *= 2;
 189         if (fi >= Size)
 190           Size = fi+1;
 191         GPRCS2Frames.resize(Size);
 192       }
 193       GPRCS2Frames[fi] = true;
 194     }
 195   }
 196   void addDPRCalleeSavedAreaFrame(int fi) {
 197     if (fi >= 0) {
 198       int Size = DPRCSFrames.size();
 199       if (fi >= Size) {
 200         Size *= 2;
 201         if (fi >= Size)
 202           Size = fi+1;
 203         DPRCSFrames.resize(Size);
 204       }
 205       DPRCSFrames[fi] = true;
 206     }
 207   }
 208
 209   unsigned createJumpTableUId() {
 210     return JumpTableUId++;
 211   }
 212
 213   unsigned getNumJumpTables() const {
 214     return JumpTableUId;
 215   }
 216
 217   void initPICLabelUId(unsigned UId) {
 218     PICLabelUId = UId;
 219   }
 220
 221   unsigned getNumPICLabels() const {
 222     return PICLabelUId;
 223   }
 224
 225   unsigned createPICLabelUId() {
 226     return PICLabelUId++;
 227   }
 228
 229   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
 230   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
 231
 232   bool hasITBlocks() const { return HasITBlocks; }
 233   void setHasITBlocks(bool h) { HasITBlocks = h; }
 234
 235   void recordCPEClone(unsigned CPIdx, unsigned CPCloneIdx) {
 236     if (!CPEClones.insert(std::make_pair(CPCloneIdx, CPIdx)).second)
 237       assert(0 && "Duplicate entries!");
 238   }
 239
 240   unsigned getOriginalCPIdx(unsigned CloneIdx) const {
 241     DenseMap<unsigned, unsigned>::const_iterator I = CPEClones.find(CloneIdx);
 242     if (I != CPEClones.end())
 243       return I->second;
 244     else
 245       return -1U;
 246   }
 247 };
 248 } // End llvm namespace
 249
 250 #endif // ARMMACHINEFUNCTIONINFO_H