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 #ifndef LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H 11 #define LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H 12 13 #include "llvm/CodeGen/MachineBasicBlock.h" 14 #include "llvm/CodeGen/TargetFrameLowering.h" 15 #include <vector> 16 17 namespace llvm { 18 19 class ARMSubtarget; 20 class CalleeSavedInfo; 21 class MachineFunction; 22 23 class ARMFrameLowering : public TargetFrameLowering { 24 protected: 25 const ARMSubtarget &STI; 26 27 public: 28 explicit ARMFrameLowering(const ARMSubtarget &sti); 29 30 /// emitProlog/emitEpilog - These methods insert prolog and epilog code into 31 /// the function. 32 void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 33 void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 34 35 bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 36 MachineBasicBlock::iterator MI, 37 const std::vector<CalleeSavedInfo> &CSI, 38 const TargetRegisterInfo *TRI) const override; 39 40 bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 41 MachineBasicBlock::iterator MI, 42 std::vector<CalleeSavedInfo> &CSI, 43 const TargetRegisterInfo *TRI) const override; 44 45 bool noFramePointerElim(const MachineFunction &MF) const override; 46 47 bool enableCalleeSaveSkip(const MachineFunction &MF) const override; 48 49 bool hasFP(const MachineFunction &MF) const override; 50 bool hasReservedCallFrame(const MachineFunction &MF) const override; 51 bool canSimplifyCallFramePseudos(const MachineFunction &MF) const override; 52 int getFrameIndexReference(const MachineFunction &MF, int FI, 53 unsigned &FrameReg) const override; 54 int ResolveFrameIndexReference(const MachineFunction &MF, int FI, 55 unsigned &FrameReg, int SPAdj) const; 56 57 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 58 RegScavenger *RS) const override; 59 60 void adjustForSegmentedStacks(MachineFunction &MF, 61 MachineBasicBlock &MBB) const override; 62 63 /// Returns true if the target will correctly handle shrink wrapping. 64 bool enableShrinkWrapping(const MachineFunction &MF) const override { 65 return true; 66 } 67 68 private: 69 void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, 70 const std::vector<CalleeSavedInfo> &CSI, unsigned StmOpc, 71 unsigned StrOpc, bool NoGap, 72 bool(*Func)(unsigned, bool), unsigned NumAlignedDPRCS2Regs, 73 unsigned MIFlags = 0) const; 74 void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, 75 std::vector<CalleeSavedInfo> &CSI, unsigned LdmOpc, 76 unsigned LdrOpc, bool isVarArg, bool NoGap, 77 bool(*Func)(unsigned, bool), 78 unsigned NumAlignedDPRCS2Regs) const; 79 80 MachineBasicBlock::iterator 81 eliminateCallFramePseudoInstr(MachineFunction &MF, 82 MachineBasicBlock &MBB, 83 MachineBasicBlock::iterator MI) const override; 84 }; 85 86 } // end namespace llvm 87 88 #endif // LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H 89
