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      1 //==-- ARMTargetFrameLowering.h - Define frame lowering for ARM --*- 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 //
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #ifndef ARM_FRAMEINFO_H
     15 #define ARM_FRAMEINFO_H
     16 
     17 #include "ARM.h"
     18 #include "ARMSubtarget.h"
     19 #include "llvm/Target/TargetFrameLowering.h"
     20 
     21 namespace llvm {
     22   class ARMSubtarget;
     23 
     24 class ARMFrameLowering : public TargetFrameLowering {
     25 protected:
     26   const ARMSubtarget &STI;
     27 
     28 public:
     29   explicit ARMFrameLowering(const ARMSubtarget &sti)
     30     : TargetFrameLowering(StackGrowsDown, sti.getStackAlignment(), 0, 4),
     31       STI(sti) {
     32   }
     33 
     34   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
     35   /// the function.
     36   void emitPrologue(MachineFunction &MF) const;
     37   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;
     38 
     39   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
     40                                  MachineBasicBlock::iterator MI,
     41                                  const std::vector<CalleeSavedInfo> &CSI,
     42                                  const TargetRegisterInfo *TRI) const;
     43 
     44   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
     45                                    MachineBasicBlock::iterator MI,
     46                                    const std::vector<CalleeSavedInfo> &CSI,
     47                                    const TargetRegisterInfo *TRI) const;
     48 
     49   bool hasFP(const MachineFunction &MF) const;
     50   bool hasReservedCallFrame(const MachineFunction &MF) const;
     51   bool canSimplifyCallFramePseudos(const MachineFunction &MF) const;
     52   int getFrameIndexReference(const MachineFunction &MF, int FI,
     53                              unsigned &FrameReg) const;
     54   int ResolveFrameIndexReference(const MachineFunction &MF,
     55                                  int FI,
     56                                  unsigned &FrameReg, int SPAdj) const;
     57   int getFrameIndexOffset(const MachineFunction &MF, int FI) const;
     58 
     59   void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
     60                                             RegScavenger *RS) const;
     61 
     62  private:
     63   void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
     64                     const std::vector<CalleeSavedInfo> &CSI, unsigned StmOpc,
     65                     unsigned StrOpc, bool NoGap,
     66                     bool(*Func)(unsigned, bool),
     67                     unsigned MIFlags = 0) const;
     68   void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
     69                    const std::vector<CalleeSavedInfo> &CSI, unsigned LdmOpc,
     70                    unsigned LdrOpc, bool isVarArg, bool NoGap,
     71                    bool(*Func)(unsigned, bool)) const;
     72 };
     73 
     74 } // End llvm namespace
     75 
     76 #endif
     77