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      1 //===-- PPCMachineFunctionInfo.h - Private data used for PowerPC --*- 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 the PowerPC specific subclass of MachineFunctionInfo.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #ifndef PPC_MACHINE_FUNCTION_INFO_H
     15 #define PPC_MACHINE_FUNCTION_INFO_H
     16 
     17 #include "llvm/CodeGen/MachineFunction.h"
     18 
     19 namespace llvm {
     20 
     21 /// PPCFunctionInfo - This class is derived from MachineFunction private
     22 /// PowerPC target-specific information for each MachineFunction.
     23 class PPCFunctionInfo : public MachineFunctionInfo {
     24   virtual void anchor();
     25 
     26   /// FramePointerSaveIndex - Frame index of where the old frame pointer is
     27   /// stored.  Also used as an anchor for instructions that need to be altered
     28   /// when using frame pointers (dyna_add, dyna_sub.)
     29   int FramePointerSaveIndex;
     30 
     31   /// ReturnAddrSaveIndex - Frame index of where the return address is stored.
     32   ///
     33   int ReturnAddrSaveIndex;
     34 
     35   /// Frame index where the old base pointer is stored.
     36   int BasePointerSaveIndex;
     37 
     38   /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
     39   /// function.  This is only valid after the initial scan of the function by
     40   /// PEI.
     41   bool MustSaveLR;
     42 
     43   /// Does this function have any stack spills.
     44   bool HasSpills;
     45 
     46   /// Does this function spill using instructions with only r+r (not r+i)
     47   /// forms.
     48   bool HasNonRISpills;
     49 
     50   /// SpillsCR - Indicates whether CR is spilled in the current function.
     51   bool SpillsCR;
     52 
     53   /// Indicates whether VRSAVE is spilled in the current function.
     54   bool SpillsVRSAVE;
     55 
     56   /// LRStoreRequired - The bool indicates whether there is some explicit use of
     57   /// the LR/LR8 stack slot that is not obvious from scanning the code.  This
     58   /// requires that the code generator produce a store of LR to the stack on
     59   /// entry, even though LR may otherwise apparently not be used.
     60   bool LRStoreRequired;
     61 
     62   /// MinReservedArea - This is the frame size that is at least reserved in a
     63   /// potential caller (parameter+linkage area).
     64   unsigned MinReservedArea;
     65 
     66   /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
     67   /// amount the stack pointer is adjusted to make the frame bigger for tail
     68   /// calls. Used for creating an area before the register spill area.
     69   int TailCallSPDelta;
     70 
     71   /// HasFastCall - Does this function contain a fast call. Used to determine
     72   /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
     73   bool HasFastCall;
     74 
     75   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
     76   int VarArgsFrameIndex;
     77   /// VarArgsStackOffset - StackOffset for start of stack
     78   /// arguments.
     79   int VarArgsStackOffset;
     80   /// VarArgsNumGPR - Index of the first unused integer
     81   /// register for parameter passing.
     82   unsigned VarArgsNumGPR;
     83   /// VarArgsNumFPR - Index of the first unused double
     84   /// register for parameter passing.
     85   unsigned VarArgsNumFPR;
     86 
     87   /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4.
     88   int CRSpillFrameIndex;
     89 
     90   /// If any of CR[2-4] need to be saved in the prologue and restored in the
     91   /// epilogue then they are added to this array. This is used for the
     92   /// 64-bit SVR4 ABI.
     93   SmallVector<unsigned, 3> MustSaveCRs;
     94 
     95 public:
     96   explicit PPCFunctionInfo(MachineFunction &MF)
     97     : FramePointerSaveIndex(0),
     98       ReturnAddrSaveIndex(0),
     99       BasePointerSaveIndex(0),
    100       HasSpills(false),
    101       HasNonRISpills(false),
    102       SpillsCR(false),
    103       SpillsVRSAVE(false),
    104       LRStoreRequired(false),
    105       MinReservedArea(0),
    106       TailCallSPDelta(0),
    107       HasFastCall(false),
    108       VarArgsFrameIndex(0),
    109       VarArgsStackOffset(0),
    110       VarArgsNumGPR(0),
    111       VarArgsNumFPR(0),
    112       CRSpillFrameIndex(0) {}
    113 
    114   int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
    115   void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
    116 
    117   int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
    118   void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
    119 
    120   int getBasePointerSaveIndex() const { return BasePointerSaveIndex; }
    121   void setBasePointerSaveIndex(int Idx) { BasePointerSaveIndex = Idx; }
    122 
    123   unsigned getMinReservedArea() const { return MinReservedArea; }
    124   void setMinReservedArea(unsigned size) { MinReservedArea = size; }
    125 
    126   int getTailCallSPDelta() const { return TailCallSPDelta; }
    127   void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
    128 
    129   /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
    130   /// scan of the function. It is true if the LR/LR8 register is ever explicitly
    131   /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
    132   /// which is used in PIC generation), or if the LR stack slot is explicitly
    133   /// referenced by builtin_return_address.
    134   void setMustSaveLR(bool U) { MustSaveLR = U; }
    135   bool mustSaveLR() const    { return MustSaveLR; }
    136 
    137   void setHasSpills()      { HasSpills = true; }
    138   bool hasSpills() const   { return HasSpills; }
    139 
    140   void setHasNonRISpills()    { HasNonRISpills = true; }
    141   bool hasNonRISpills() const { return HasNonRISpills; }
    142 
    143   void setSpillsCR()       { SpillsCR = true; }
    144   bool isCRSpilled() const { return SpillsCR; }
    145 
    146   void setSpillsVRSAVE()       { SpillsVRSAVE = true; }
    147   bool isVRSAVESpilled() const { return SpillsVRSAVE; }
    148 
    149   void setLRStoreRequired() { LRStoreRequired = true; }
    150   bool isLRStoreRequired() const { return LRStoreRequired; }
    151 
    152   void setHasFastCall() { HasFastCall = true; }
    153   bool hasFastCall() const { return HasFastCall;}
    154 
    155   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
    156   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
    157 
    158   int getVarArgsStackOffset() const { return VarArgsStackOffset; }
    159   void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; }
    160 
    161   unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; }
    162   void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; }
    163 
    164   unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; }
    165   void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; }
    166 
    167   int getCRSpillFrameIndex() const { return CRSpillFrameIndex; }
    168   void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; }
    169 
    170   const SmallVectorImpl<unsigned> &
    171     getMustSaveCRs() const { return MustSaveCRs; }
    172   void addMustSaveCR(unsigned Reg) { MustSaveCRs.push_back(Reg); }
    173 };
    174 
    175 } // end of namespace llvm
    176 
    177 
    178 #endif
    179