| Ulrich Weigand | 1d09d56 | 2013-05-06 16:15:19 +0000 | [diff] [blame] | 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 SYSTEMZFRAMELOWERING_H |
| 11 | #define SYSTEMZFRAMELOWERING_H |
| 12 | |
| 13 | #include "SystemZSubtarget.h" |
| 14 | #include "llvm/ADT/IndexedMap.h" |
| 15 | #include "llvm/Target/TargetFrameLowering.h" |
| 16 | |
| 17 | namespace llvm { |
| 18 | class SystemZTargetMachine; |
| 19 | class SystemZSubtarget; |
| 20 | |
| 21 | class SystemZFrameLowering : public TargetFrameLowering { |
| 22 | IndexedMap<unsigned> RegSpillOffsets; |
| 23 | |
| 24 | protected: |
| 25 | const SystemZTargetMachine &TM; |
| 26 | const SystemZSubtarget &STI; |
| 27 | |
| 28 | public: |
| 29 | SystemZFrameLowering(const SystemZTargetMachine &tm, |
| 30 | const SystemZSubtarget &sti); |
| 31 | |
| Richard Sandiford | 52c28b0 | 2013-07-03 09:11:00 +0000 | [diff] [blame^] | 32 | // Override TargetFrameLowering. |
| 33 | virtual const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries) const |
| 34 | LLVM_OVERRIDE; |
| Ulrich Weigand | 1d09d56 | 2013-05-06 16:15:19 +0000 | [diff] [blame] | 35 | virtual void |
| 36 | processFunctionBeforeCalleeSavedScan(MachineFunction &MF, |
| 37 | RegScavenger *RS) const LLVM_OVERRIDE; |
| 38 | virtual bool |
| 39 | spillCalleeSavedRegisters(MachineBasicBlock &MBB, |
| 40 | MachineBasicBlock::iterator MBBI, |
| 41 | const std::vector<CalleeSavedInfo> &CSI, |
| 42 | const TargetRegisterInfo *TRI) const |
| 43 | LLVM_OVERRIDE; |
| 44 | virtual bool |
| 45 | restoreCalleeSavedRegisters(MachineBasicBlock &MBB, |
| 46 | MachineBasicBlock::iterator MBBII, |
| 47 | const std::vector<CalleeSavedInfo> &CSI, |
| 48 | const TargetRegisterInfo *TRI) const |
| 49 | LLVM_OVERRIDE; |
| 50 | virtual void emitPrologue(MachineFunction &MF) const LLVM_OVERRIDE; |
| 51 | virtual void emitEpilogue(MachineFunction &MF, |
| 52 | MachineBasicBlock &MBB) const LLVM_OVERRIDE; |
| 53 | virtual bool hasFP(const MachineFunction &MF) const LLVM_OVERRIDE; |
| 54 | virtual int getFrameIndexOffset(const MachineFunction &MF, |
| 55 | int FI) const LLVM_OVERRIDE; |
| 56 | virtual bool hasReservedCallFrame(const MachineFunction &MF) const |
| 57 | LLVM_OVERRIDE; |
| 58 | virtual void |
| 59 | eliminateCallFramePseudoInstr(MachineFunction &MF, |
| 60 | MachineBasicBlock &MBB, |
| 61 | MachineBasicBlock::iterator MI) const |
| 62 | LLVM_OVERRIDE; |
| 63 | |
| Ulrich Weigand | 1d09d56 | 2013-05-06 16:15:19 +0000 | [diff] [blame] | 64 | // Return the number of bytes in the callee-allocated part of the frame. |
| 65 | uint64_t getAllocatedStackSize(const MachineFunction &MF) const; |
| 66 | |
| 67 | // Return the number of frame bytes that should be reserved for |
| 68 | // an emergency spill slot, for use by the register scaveneger. |
| 69 | // Return 0 if register scaveging won't be needed. |
| 70 | unsigned getEmergencySpillSlotSize(const MachineFunction &MF) const; |
| 71 | |
| 72 | // Return the offset from the frame pointer of the emergency spill slot, |
| 73 | // which always fits within a 12-bit unsigned displacement field. |
| 74 | // Only valid if getEmergencySpillSlotSize(MF) returns nonzero. |
| 75 | unsigned getEmergencySpillSlotOffset(const MachineFunction &MF) const; |
| 76 | |
| 77 | // Return the byte offset from the incoming stack pointer of Reg's |
| 78 | // ABI-defined save slot. Return 0 if no slot is defined for Reg. |
| 79 | unsigned getRegSpillOffset(unsigned Reg) const { |
| 80 | return RegSpillOffsets[Reg]; |
| 81 | } |
| 82 | }; |
| 83 | } // end namespace llvm |
| 84 | |
| 85 | #endif |