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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   /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
     36   /// function.  This is only valid after the initial scan of the function by
     37   /// PEI.
     38   bool MustSaveLR;
     39 
     40   /// Does this function have any stack spills.
     41   bool HasSpills;
     42 
     43   /// Does this function spill using instructions with only r+r (not r+i)
     44   /// forms.
     45   bool HasNonRISpills;
     46 
     47   /// SpillsCR - Indicates whether CR is spilled in the current function.
     48   bool SpillsCR;
     49 
     50   /// LRStoreRequired - The bool indicates whether there is some explicit use of
     51   /// the LR/LR8 stack slot that is not obvious from scanning the code.  This
     52   /// requires that the code generator produce a store of LR to the stack on
     53   /// entry, even though LR may otherwise apparently not be used.
     54   bool LRStoreRequired;
     55 
     56   /// MinReservedArea - This is the frame size that is at least reserved in a
     57   /// potential caller (parameter+linkage area).
     58   unsigned MinReservedArea;
     59 
     60   /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
     61   /// amount the stack pointer is adjusted to make the frame bigger for tail
     62   /// calls. Used for creating an area before the register spill area.
     63   int TailCallSPDelta;
     64 
     65   /// HasFastCall - Does this function contain a fast call. Used to determine
     66   /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
     67   bool HasFastCall;
     68 
     69   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
     70   int VarArgsFrameIndex;
     71   /// VarArgsStackOffset - StackOffset for start of stack
     72   /// arguments.
     73   int VarArgsStackOffset;
     74   /// VarArgsNumGPR - Index of the first unused integer
     75   /// register for parameter passing.
     76   unsigned VarArgsNumGPR;
     77   /// VarArgsNumFPR - Index of the first unused double
     78   /// register for parameter passing.
     79   unsigned VarArgsNumFPR;
     80 
     81   /// CRSpillFrameIndex - FrameIndex for CR spill slot for 32-bit SVR4.
     82   int CRSpillFrameIndex;
     83 
     84 public:
     85   explicit PPCFunctionInfo(MachineFunction &MF)
     86     : FramePointerSaveIndex(0),
     87       ReturnAddrSaveIndex(0),
     88       HasSpills(false),
     89       HasNonRISpills(false),
     90       SpillsCR(false),
     91       LRStoreRequired(false),
     92       MinReservedArea(0),
     93       TailCallSPDelta(0),
     94       HasFastCall(false),
     95       VarArgsFrameIndex(0),
     96       VarArgsStackOffset(0),
     97       VarArgsNumGPR(0),
     98       VarArgsNumFPR(0),
     99       CRSpillFrameIndex(0) {}
    100 
    101   int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
    102   void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
    103 
    104   int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
    105   void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
    106 
    107   unsigned getMinReservedArea() const { return MinReservedArea; }
    108   void setMinReservedArea(unsigned size) { MinReservedArea = size; }
    109 
    110   int getTailCallSPDelta() const { return TailCallSPDelta; }
    111   void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
    112 
    113   /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
    114   /// scan of the function. It is true if the LR/LR8 register is ever explicitly
    115   /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
    116   /// which is used in PIC generation), or if the LR stack slot is explicitly
    117   /// referenced by builtin_return_address.
    118   void setMustSaveLR(bool U) { MustSaveLR = U; }
    119   bool mustSaveLR() const    { return MustSaveLR; }
    120 
    121   void setHasSpills()      { HasSpills = true; }
    122   bool hasSpills() const   { return HasSpills; }
    123 
    124   void setHasNonRISpills()    { HasNonRISpills = true; }
    125   bool hasNonRISpills() const { return HasNonRISpills; }
    126 
    127   void setSpillsCR()       { SpillsCR = true; }
    128   bool isCRSpilled() const { return SpillsCR; }
    129 
    130   void setLRStoreRequired() { LRStoreRequired = true; }
    131   bool isLRStoreRequired() const { return LRStoreRequired; }
    132 
    133   void setHasFastCall() { HasFastCall = true; }
    134   bool hasFastCall() const { return HasFastCall;}
    135 
    136   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
    137   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
    138 
    139   int getVarArgsStackOffset() const { return VarArgsStackOffset; }
    140   void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; }
    141 
    142   unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; }
    143   void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; }
    144 
    145   unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; }
    146   void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; }
    147 
    148   int getCRSpillFrameIndex() const { return CRSpillFrameIndex; }
    149   void setCRSpillFrameIndex(int idx) { CRSpillFrameIndex = idx; }
    150 };
    151 
    152 } // end of namespace llvm
    153 
    154 
    155 #endif
    156