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