1 //===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- 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_SYSTEMZ_SYSTEMZFRAMELOWERING_H
11 #define LLVM_LIB_TARGET_SYSTEMZ_SYSTEMZFRAMELOWERING_H
12 
13 #include "llvm/ADT/IndexedMap.h"
14 #include "llvm/Target/TargetFrameLowering.h"
15 
16 namespace llvm {
17 class SystemZTargetMachine;
18 class SystemZSubtarget;
19 
20 class SystemZFrameLowering : public TargetFrameLowering {
21   IndexedMap<unsigned> RegSpillOffsets;
22 
23 public:
24   SystemZFrameLowering();
25 
26   // Override TargetFrameLowering.
isFPCloseToIncomingSP()27   bool isFPCloseToIncomingSP() const override { return false; }
28   const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const
29     override;
30   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
31                             RegScavenger *RS) const override;
32   bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
33                                  MachineBasicBlock::iterator MBBI,
34                                  const std::vector<CalleeSavedInfo> &CSI,
35                                  const TargetRegisterInfo *TRI) const override;
36   bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
37                                    MachineBasicBlock::iterator MBBII,
38                                    const std::vector<CalleeSavedInfo> &CSI,
39                                    const TargetRegisterInfo *TRI) const
40     override;
41   void processFunctionBeforeFrameFinalized(MachineFunction &MF,
42                                            RegScavenger *RS) const override;
43   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
44   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
45   bool hasFP(const MachineFunction &MF) const override;
46   int getFrameIndexReference(const MachineFunction &MF, int FI,
47                              unsigned &FrameReg) const override;
48   bool hasReservedCallFrame(const MachineFunction &MF) const override;
49   void eliminateCallFramePseudoInstr(MachineFunction &MF,
50                                      MachineBasicBlock &MBB,
51                                      MachineBasicBlock::iterator MI) const
52     override;
53 
54   // Return the number of bytes in the callee-allocated part of the frame.
55   uint64_t getAllocatedStackSize(const MachineFunction &MF) const;
56 
57   // Return the byte offset from the incoming stack pointer of Reg's
58   // ABI-defined save slot.  Return 0 if no slot is defined for Reg.
getRegSpillOffset(unsigned Reg)59   unsigned getRegSpillOffset(unsigned Reg) const {
60     return RegSpillOffsets[Reg];
61   }
62 };
63 } // end namespace llvm
64 
65 #endif
66