lib/Target/AArch64/AArch64FrameLowering.h

   1 //==-- AArch64FrameLowering.h - TargetFrameLowering for AArch64 --*- 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 //
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_AARCH64_AARCH64FRAMELOWERING_H
  14 #define LLVM_LIB_TARGET_AARCH64_AARCH64FRAMELOWERING_H
  15
  16 #include "AArch64StackOffset.h"
  17 #include "llvm/CodeGen/TargetFrameLowering.h"
  18
  19 namespace llvm {
  20
  21 class AArch64FrameLowering : public TargetFrameLowering {
  22 public:
  23   explicit AArch64FrameLowering()
  24       : TargetFrameLowering(StackGrowsDown, Align(16), 0, Align(16),
  25                             true /*StackRealignable*/) {}
  26
  27   void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
  28                                  MachineBasicBlock::iterator MBBI) const;
  29
  30   MachineBasicBlock::iterator
  31   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
  32                                 MachineBasicBlock::iterator I) const override;
  33
  34   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  35   /// the function.
  36   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  37   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  38
  39   bool canUseAsPrologue(const MachineBasicBlock &MBB) const override;
  40
  41   int getFrameIndexReference(const MachineFunction &MF, int FI,
  42                              unsigned &FrameReg) const override;
  43   StackOffset resolveFrameIndexReference(const MachineFunction &MF, int FI,
  44                                          unsigned &FrameReg, bool PreferFP,
  45                                          bool ForSimm) const;
  46   StackOffset resolveFrameOffsetReference(const MachineFunction &MF,
  47                                           int ObjectOffset, bool isFixed,
  48                                           bool isSVE, unsigned &FrameReg,
  49                                           bool PreferFP, bool ForSimm) const;
  50   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
  51                                  MachineBasicBlock::iterator MI,
  52                                  const std::vector<CalleeSavedInfo> &CSI,
  53                                  const TargetRegisterInfo *TRI) const override;
  54
  55   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
  56                                   MachineBasicBlock::iterator MI,
  57                                   std::vector<CalleeSavedInfo> &CSI,
  58                                   const TargetRegisterInfo *TRI) const override;
  59
  60   /// Can this function use the red zone for local allocations.
  61   bool canUseRedZone(const MachineFunction &MF) const;
  62
  63   bool hasFP(const MachineFunction &MF) const override;
  64   bool hasReservedCallFrame(const MachineFunction &MF) const override;
  65
  66   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
  67                             RegScavenger *RS) const override;
  68
  69   /// Returns true if the target will correctly handle shrink wrapping.
  70   bool enableShrinkWrapping(const MachineFunction &MF) const override {
  71     return true;
  72   }
  73
  74   bool enableStackSlotScavenging(const MachineFunction &MF) const override;
  75
  76   void processFunctionBeforeFrameFinalized(MachineFunction &MF,
  77                                              RegScavenger *RS) const override;
  78
  79   unsigned getWinEHParentFrameOffset(const MachineFunction &MF) const override;
  80
  81   unsigned getWinEHFuncletFrameSize(const MachineFunction &MF) const;
  82
  83   int getFrameIndexReferencePreferSP(const MachineFunction &MF, int FI,
  84                                      unsigned &FrameReg,
  85                                      bool IgnoreSPUpdates) const override;
  86   int getNonLocalFrameIndexReference(const MachineFunction &MF,
  87                                int FI) const override;
  88   int getSEHFrameIndexOffset(const MachineFunction &MF, int FI) const;
  89
  90   bool isSupportedStackID(TargetStackID::Value ID) const override {
  91     switch (ID) {
  92     default:
  93       return false;
  94     case TargetStackID::Default:
  95     case TargetStackID::SVEVector:
  96     case TargetStackID::NoAlloc:
  97       return true;
  98     }
  99   }
 100
 101 private:
 102   bool shouldCombineCSRLocalStackBump(MachineFunction &MF,
 103                                       unsigned StackBumpBytes) const;
 104   int64_t determineSVEStackSize(MachineFrameInfo &MF, unsigned &MaxAlign) const;
 105 };
 106
 107 } // End llvm namespace
 108
 109 #endif