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: ARMFrameLowering(const ARMSubtarget & sti)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