lib/Target/PowerPC/PPCMachineFunctionInfo.h

   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 public:
  62   explicit PPCFunctionInfo(MachineFunction &MF)
  63     : FramePointerSaveIndex(0),
  64       ReturnAddrSaveIndex(0),
  65       SpillsCR(false),
  66       LRStoreRequired(false),
  67       MinReservedArea(0),
  68       TailCallSPDelta(0),
  69       HasFastCall(false) {}
  70
  71   int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
  72   void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
  73
  74   int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
  75   void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
  76
  77   unsigned getMinReservedArea() const { return MinReservedArea; }
  78   void setMinReservedArea(unsigned size) { MinReservedArea = size; }
  79
  80   int getTailCallSPDelta() const { return TailCallSPDelta; }
  81   void setTailCallSPDelta(int size) { TailCallSPDelta = size; }
  82
  83   /// MustSaveLR - This is set when the prolog/epilog inserter does its initial
  84   /// scan of the function. It is true if the LR/LR8 register is ever explicitly
  85   /// defined/clobbered in the machine function (e.g. by calls and movpctolr,
  86   /// which is used in PIC generation), or if the LR stack slot is explicitly
  87   /// referenced by builtin_return_address.
  88   void setMustSaveLR(bool U) { MustSaveLR = U; }
  89   bool mustSaveLR() const    { return MustSaveLR; }
  90
  91   void setSpillsCR()       { SpillsCR = true; }
  92   bool isCRSpilled() const { return SpillsCR; }
  93
  94   void setLRStoreRequired() { LRStoreRequired = true; }
  95   bool isLRStoreRequired() const { return LRStoreRequired; }
  96
  97   void setHasFastCall() { HasFastCall = true; }
  98   bool hasFastCall() const { return HasFastCall;}
  99 };
 100
 101 } // end of namespace llvm
 102
 103
 104 #endif