| //===-- PPCFrameLowering.h - Define frame lowering for PowerPC --*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_LIB_TARGET_POWERPC_PPCFRAMELOWERING_H |
| #define LLVM_LIB_TARGET_POWERPC_PPCFRAMELOWERING_H |
| |
| #include "PPC.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/Target/TargetFrameLowering.h" |
| #include "llvm/Target/TargetMachine.h" |
| |
| namespace llvm { |
| class PPCSubtarget; |
| |
| class PPCFrameLowering: public TargetFrameLowering { |
| const PPCSubtarget &Subtarget; |
| |
| public: |
| PPCFrameLowering(const PPCSubtarget &STI); |
| |
| unsigned determineFrameLayout(MachineFunction &MF, |
| bool UpdateMF = true, |
| bool UseEstimate = false) const; |
| |
| /// emitProlog/emitEpilog - These methods insert prolog and epilog code into |
| /// the function. |
| void emitPrologue(MachineFunction &MF) const override; |
| void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override; |
| |
| bool hasFP(const MachineFunction &MF) const override; |
| bool needsFP(const MachineFunction &MF) const; |
| void replaceFPWithRealFP(MachineFunction &MF) const; |
| |
| void processFunctionBeforeCalleeSavedScan(MachineFunction &MF, |
| RegScavenger *RS = nullptr) const override; |
| void processFunctionBeforeFrameFinalized(MachineFunction &MF, |
| RegScavenger *RS = nullptr) const override; |
| void addScavengingSpillSlot(MachineFunction &MF, RegScavenger *RS) const; |
| |
| bool spillCalleeSavedRegisters(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI, |
| const std::vector<CalleeSavedInfo> &CSI, |
| const TargetRegisterInfo *TRI) const override; |
| |
| void eliminateCallFramePseudoInstr(MachineFunction &MF, |
| MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator I) const override; |
| |
| bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB, |
| MachineBasicBlock::iterator MI, |
| const std::vector<CalleeSavedInfo> &CSI, |
| const TargetRegisterInfo *TRI) const override; |
| |
| /// targetHandlesStackFrameRounding - Returns true if the target is |
| /// responsible for rounding up the stack frame (probably at emitPrologue |
| /// time). |
| bool targetHandlesStackFrameRounding() const override { return true; } |
| |
| /// getReturnSaveOffset - Return the previous frame offset to save the |
| /// return address. |
| static unsigned getReturnSaveOffset(bool isPPC64, bool isDarwinABI) { |
| if (isDarwinABI) |
| return isPPC64 ? 16 : 8; |
| // SVR4 ABI: |
| return isPPC64 ? 16 : 4; |
| } |
| |
| /// getTOCSaveOffset - Return the previous frame offset to save the |
| /// TOC register -- 64-bit SVR4 ABI only. |
| static unsigned getTOCSaveOffset(bool isELFv2ABI) { |
| return isELFv2ABI ? 24 : 40; |
| } |
| |
| /// getFramePointerSaveOffset - Return the previous frame offset to save the |
| /// frame pointer. |
| static unsigned getFramePointerSaveOffset(bool isPPC64, bool isDarwinABI) { |
| // For the Darwin ABI: |
| // We cannot use the TOC save slot (offset +20) in the PowerPC linkage area |
| // for saving the frame pointer (if needed.) While the published ABI has |
| // not used this slot since at least MacOSX 10.2, there is older code |
| // around that does use it, and that needs to continue to work. |
| if (isDarwinABI) |
| return isPPC64 ? -8U : -4U; |
| |
| // SVR4 ABI: First slot in the general register save area. |
| return isPPC64 ? -8U : -4U; |
| } |
| |
| /// getBasePointerSaveOffset - Return the previous frame offset to save the |
| /// base pointer. |
| static unsigned getBasePointerSaveOffset(bool isPPC64, |
| bool isDarwinABI, |
| bool isPIC) { |
| if (isDarwinABI) |
| return isPPC64 ? -16U : -8U; |
| |
| // SVR4 ABI: First slot in the general register save area. |
| return isPPC64 ? -16U : isPIC ? -12U : -8U; |
| } |
| |
| /// getLinkageSize - Return the size of the PowerPC ABI linkage area. |
| /// |
| static unsigned getLinkageSize(bool isPPC64, bool isDarwinABI, |
| bool isELFv2ABI) { |
| if (isDarwinABI || isPPC64) |
| return (isELFv2ABI ? 4 : 6) * (isPPC64 ? 8 : 4); |
| |
| // SVR4 ABI: |
| return 8; |
| } |
| |
| const SpillSlot * |
| getCalleeSavedSpillSlots(unsigned &NumEntries) const override; |
| }; |
| } // End llvm namespace |
| |
| #endif |