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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 private:
     25   /// FramePointerSaveIndex - Frame index of where the old frame pointer is
     26   /// stored.  Also used as an anchor for instructions that need to be altered
     27   /// when using frame pointers (dyna_add, dyna_sub.)
     28   int FramePointerSaveIndex;
     29 
     30   /// ReturnAddrSaveIndex - Frame index of where the return address is stored.
     31   ///
     32   int ReturnAddrSaveIndex;
     33 
     34   /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
     35   /// function.  This is only valid after the initial scan of the function by
     36   /// PEI.
     37   bool MustSaveLR;
     38 
     39   /// SpillsCR - Indicates whether CR is spilled in the current function.
     40   bool SpillsCR;
     41 
     42   /// LRStoreRequired - The bool indicates whether there is some explicit use of
     43   /// the LR/LR8 stack slot that is not obvious from scanning the code.  This
     44   /// requires that the code generator produce a store of LR to the stack on
     45   /// entry, even though LR may otherwise apparently not be used.
     46   bool LRStoreRequired;
     47 
     48   /// MinReservedArea - This is the frame size that is at least reserved in a
     49   /// potential caller (parameter+linkage area).
     50   unsigned MinReservedArea;
     51 
     52   /// TailCallSPDelta - Stack pointer delta used when tail calling. Maximum
     53   /// amount the stack pointer is adjusted to make the frame bigger for tail
     54   /// calls. Used for creating an area before the register spill area.
     55   int TailCallSPDelta;
     56 
     57   /// HasFastCall - Does this function contain a fast call. Used to determine
     58   /// how the caller's stack pointer should be calculated (epilog/dynamicalloc).
     59   bool HasFastCall;
     60 
     61   /// VarArgsFrameIndex - FrameIndex for start of varargs area.
     62   int VarArgsFrameIndex;
     63   /// VarArgsStackOffset - StackOffset for start of stack
     64   /// arguments.
     65   int VarArgsStackOffset;
     66   /// VarArgsNumGPR - Index of the first unused integer
     67   /// register for parameter passing.
     68   unsigned VarArgsNumGPR;
     69   /// VarArgsNumFPR - Index of the first unused double
     70   /// register for parameter passing.
     71   unsigned VarArgsNumFPR;
     72 
     73 public:
     74   explicit PPCFunctionInfo(MachineFunction &MF)
     75     : FramePointerSaveIndex(0),
     76       ReturnAddrSaveIndex(0),
     77       SpillsCR(false),
     78       LRStoreRequired(false),
     79       MinReservedArea(0),
     80       TailCallSPDelta(0),
     81       HasFastCall(false),
     82       VarArgsFrameIndex(0),
     83       VarArgsStackOffset(0),
     84       VarArgsNumGPR(0),
     85       VarArgsNumFPR(0) {}
     86 
     87   int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
     88   void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
     89 
     90   int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
     91   void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
     92 
     93   unsigned getMinReservedArea() const { return MinReservedArea; }
     94   void setMinReservedArea(unsigned size) { MinReservedArea = size; }
     95 
     96   int getTailCallSPDelta() const { return TailCallSPDelta; }
     97   void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
     98 
     99   /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
    100   /// scan of the function. It is true if the LR/LR8 register is ever explicitly
    101   /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
    102   /// which is used in PIC generation), or if the LR stack slot is explicitly
    103   /// referenced by builtin_return_address.
    104   void setMustSaveLR(bool U) { MustSaveLR = U; }
    105   bool mustSaveLR() const    { return MustSaveLR; }
    106 
    107   void setSpillsCR()       { SpillsCR = true; }
    108   bool isCRSpilled() const { return SpillsCR; }
    109 
    110   void setLRStoreRequired() { LRStoreRequired = true; }
    111   bool isLRStoreRequired() const { return LRStoreRequired; }
    112 
    113   void setHasFastCall() { HasFastCall = true; }
    114   bool hasFastCall() const { return HasFastCall;}
    115 
    116   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
    117   void setVarArgsFrameIndex(int Index) { VarArgsFrameIndex = Index; }
    118 
    119   int getVarArgsStackOffset() const { return VarArgsStackOffset; }
    120   void setVarArgsStackOffset(int Offset) { VarArgsStackOffset = Offset; }
    121 
    122   unsigned getVarArgsNumGPR() const { return VarArgsNumGPR; }
    123   void setVarArgsNumGPR(unsigned Num) { VarArgsNumGPR = Num; }
    124 
    125   unsigned getVarArgsNumFPR() const { return VarArgsNumFPR; }
    126   void setVarArgsNumFPR(unsigned Num) { VarArgsNumFPR = Num; }
    127 };
    128 
    129 } // end of namespace llvm
    130 
    131 
    132 #endif
    133