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   /// UsesLR - Indicates whether LR is used in the current function.  This is
  35   /// only valid after the initial scan of the function by PEI.
  36   bool UsesLR;
  37
  38   /// LRStoreRequired - The bool indicates whether there is some explicit use of
  39   /// the LR/LR8 stack slot that is not obvious from scanning the code.  This
  40   /// requires that the code generator produce a store of LR to the stack on
  41   /// entry, even though LR may otherwise apparently not be used.
  42   bool LRStoreRequired;
  43 public:
  44   PPCFunctionInfo(MachineFunction &MF)
  45     : FramePointerSaveIndex(0), ReturnAddrSaveIndex(0), LRStoreRequired(false){}
  46
  47   int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
  48   void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
  49
  50   int getReturnAddrSaveIndex() const { return ReturnAddrSaveIndex; }
  51   void setReturnAddrSaveIndex(int idx) { ReturnAddrSaveIndex = idx; }
  52
  53   /// UsesLR - This is set when the prolog/epilog inserter does its initial scan
  54   /// of the function, it is true if the LR/LR8 register is ever explicitly
  55   /// accessed/clobbered in the machine function (e.g. by calls and movpctolr,
  56   /// which is used in PIC generation).
  57   void setUsesLR(bool U) { UsesLR = U; }
  58   bool usesLR() const    { return UsesLR; }
  59
  60   void setLRStoreRequired() { LRStoreRequired = true; }
  61   bool isLRStoreRequired() const { return LRStoreRequired; }
  62
  63 };
  64
  65 } // end of namespace llvm
  66
  67
  68 #endif