10b57cec5SDimitry Andric //===- ARMTargetFrameLowering.h - Define frame lowering for ARM -*- C++ -*-===// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric 90b57cec5SDimitry Andric #ifndef LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H 100b57cec5SDimitry Andric #define LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H 110b57cec5SDimitry Andric 120b57cec5SDimitry Andric #include "llvm/CodeGen/TargetFrameLowering.h" 13e8d8bef9SDimitry Andric #include "llvm/Support/TypeSize.h" 140b57cec5SDimitry Andric 150b57cec5SDimitry Andric namespace llvm { 160b57cec5SDimitry Andric 170b57cec5SDimitry Andric class ARMSubtarget; 180b57cec5SDimitry Andric class CalleeSavedInfo; 190b57cec5SDimitry Andric class MachineFunction; 200b57cec5SDimitry Andric 210b57cec5SDimitry Andric class ARMFrameLowering : public TargetFrameLowering { 220b57cec5SDimitry Andric protected: 230b57cec5SDimitry Andric const ARMSubtarget &STI; 240b57cec5SDimitry Andric 250b57cec5SDimitry Andric public: 260b57cec5SDimitry Andric explicit ARMFrameLowering(const ARMSubtarget &sti); 270b57cec5SDimitry Andric 280b57cec5SDimitry Andric /// emitProlog/emitEpilog - These methods insert prolog and epilog code into 290b57cec5SDimitry Andric /// the function. 300b57cec5SDimitry Andric void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 310b57cec5SDimitry Andric void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; 320b57cec5SDimitry Andric 330b57cec5SDimitry Andric bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, 340b57cec5SDimitry Andric MachineBasicBlock::iterator MI, 355ffd83dbSDimitry Andric ArrayRef<CalleeSavedInfo> CSI, 360b57cec5SDimitry Andric const TargetRegisterInfo *TRI) const override; 370b57cec5SDimitry Andric 385ffd83dbSDimitry Andric bool 395ffd83dbSDimitry Andric restoreCalleeSavedRegisters(MachineBasicBlock &MBB, 400b57cec5SDimitry Andric MachineBasicBlock::iterator MI, 415ffd83dbSDimitry Andric MutableArrayRef<CalleeSavedInfo> CSI, 420b57cec5SDimitry Andric const TargetRegisterInfo *TRI) const override; 430b57cec5SDimitry Andric 440b57cec5SDimitry Andric bool keepFramePointer(const MachineFunction &MF) const override; 450b57cec5SDimitry Andric 460b57cec5SDimitry Andric bool enableCalleeSaveSkip(const MachineFunction &MF) const override; 470b57cec5SDimitry Andric 480b57cec5SDimitry Andric bool hasFP(const MachineFunction &MF) const override; 4981ad6265SDimitry Andric bool isFPReserved(const MachineFunction &MF) const; 50*0fca6ea1SDimitry Andric bool requiresAAPCSFrameRecord(const MachineFunction &MF) const; 510b57cec5SDimitry Andric bool hasReservedCallFrame(const MachineFunction &MF) const override; 520b57cec5SDimitry Andric bool canSimplifyCallFramePseudos(const MachineFunction &MF) const override; 53e8d8bef9SDimitry Andric StackOffset getFrameIndexReference(const MachineFunction &MF, int FI, 545ffd83dbSDimitry Andric Register &FrameReg) const override; 550b57cec5SDimitry Andric int ResolveFrameIndexReference(const MachineFunction &MF, int FI, 565ffd83dbSDimitry Andric Register &FrameReg, int SPAdj) const; 570b57cec5SDimitry Andric 58480093f4SDimitry Andric void getCalleeSaves(const MachineFunction &MF, 59480093f4SDimitry Andric BitVector &SavedRegs) const override; 600b57cec5SDimitry Andric void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs, 610b57cec5SDimitry Andric RegScavenger *RS) const override; 620b57cec5SDimitry Andric 63439352acSDimitry Andric /// Update the IsRestored flag on LR if it is spilled, based on the return 64439352acSDimitry Andric /// instructions. 65439352acSDimitry Andric static void updateLRRestored(MachineFunction &MF); 66439352acSDimitry Andric 67cb14a3feSDimitry Andric void processFunctionBeforeFrameFinalized( 68cb14a3feSDimitry Andric MachineFunction &MF, RegScavenger *RS = nullptr) const override; 69cb14a3feSDimitry Andric 700b57cec5SDimitry Andric void adjustForSegmentedStacks(MachineFunction &MF, 710b57cec5SDimitry Andric MachineBasicBlock &MBB) const override; 720b57cec5SDimitry Andric 730b57cec5SDimitry Andric /// Returns true if the target will correctly handle shrink wrapping. 745ffd83dbSDimitry Andric bool enableShrinkWrapping(const MachineFunction &MF) const override; 755ffd83dbSDimitry Andric 768bcb0991SDimitry Andric bool isProfitableForNoCSROpt(const Function &F) const override { 778bcb0991SDimitry Andric // The no-CSR optimisation is bad for code size on ARM, because we can save 788bcb0991SDimitry Andric // many registers with a single PUSH/POP pair. 798bcb0991SDimitry Andric return false; 808bcb0991SDimitry Andric } 810b57cec5SDimitry Andric 825ffd83dbSDimitry Andric bool 835ffd83dbSDimitry Andric assignCalleeSavedSpillSlots(MachineFunction &MF, 845ffd83dbSDimitry Andric const TargetRegisterInfo *TRI, 855ffd83dbSDimitry Andric std::vector<CalleeSavedInfo> &CSI) const override; 865ffd83dbSDimitry Andric 875ffd83dbSDimitry Andric const SpillSlot * 885ffd83dbSDimitry Andric getCalleeSavedSpillSlots(unsigned &NumEntries) const override; 895ffd83dbSDimitry Andric 900b57cec5SDimitry Andric private: 910b57cec5SDimitry Andric void emitPushInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, 925ffd83dbSDimitry Andric ArrayRef<CalleeSavedInfo> CSI, unsigned StmOpc, 935ffd83dbSDimitry Andric unsigned StrOpc, bool NoGap, bool (*Func)(unsigned, bool), 945ffd83dbSDimitry Andric unsigned NumAlignedDPRCS2Regs, unsigned MIFlags = 0) const; 950b57cec5SDimitry Andric void emitPopInst(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, 965ffd83dbSDimitry Andric MutableArrayRef<CalleeSavedInfo> CSI, unsigned LdmOpc, 970b57cec5SDimitry Andric unsigned LdrOpc, bool isVarArg, bool NoGap, 980b57cec5SDimitry Andric bool (*Func)(unsigned, bool), 990b57cec5SDimitry Andric unsigned NumAlignedDPRCS2Regs) const; 1000b57cec5SDimitry Andric 1010b57cec5SDimitry Andric MachineBasicBlock::iterator 1020b57cec5SDimitry Andric eliminateCallFramePseudoInstr(MachineFunction &MF, 1030b57cec5SDimitry Andric MachineBasicBlock &MBB, 1040b57cec5SDimitry Andric MachineBasicBlock::iterator MI) const override; 1050b57cec5SDimitry Andric }; 1060b57cec5SDimitry Andric 1070b57cec5SDimitry Andric } // end namespace llvm 1080b57cec5SDimitry Andric 1090b57cec5SDimitry Andric #endif // LLVM_LIB_TARGET_ARM_ARMFRAMELOWERING_H 110