llvm/lib/Target/Lanai/LanaiFrameLowering.h

   1 //===-- LanaiFrameLowering.h - Define frame lowering for Lanai --*- C++-*--===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This class implements Lanai-specific bits of TargetFrameLowering class.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
  14 #define LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H
  15
  16 #include "llvm/CodeGen/TargetFrameLowering.h"
  17
  18 namespace llvm {
  19
  20 class BitVector;
  21 class LanaiSubtarget;
  22
  23 class LanaiFrameLowering : public TargetFrameLowering {
  24 private:
  25   void determineFrameLayout(MachineFunction &MF) const;
  26   void replaceAdjDynAllocPseudo(MachineFunction &MF) const;
  27
  28 protected:
  29   const LanaiSubtarget &STI;
  30
  31 public:
  32   explicit LanaiFrameLowering(const LanaiSubtarget &Subtarget)
  33       : TargetFrameLowering(StackGrowsDown,
  34                             /*StackAlignment=*/Align(8),
  35                             /*LocalAreaOffset=*/0),
  36         STI(Subtarget) {}
  37
  38   // emitProlog/emitEpilog - These methods insert prolog and epilog code into
  39   // the function.
  40   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  41   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  42
  43   MachineBasicBlock::iterator
  44   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
  45                                 MachineBasicBlock::iterator I) const override;
  46
  47   bool hasFP(const MachineFunction & /*MF*/) const override { return true; }
  48
  49   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
  50                             RegScavenger *RS = nullptr) const override;
  51 };
  52
  53 } // namespace llvm
  54
  55 #endif // LLVM_LIB_TARGET_LANAI_LANAIFRAMELOWERING_H