forked from OSchip/llvm-project
94 lines
3.8 KiB
C++
94 lines
3.8 KiB
C++
//===-- SystemZFrameLowering.h - Frame lowering for SystemZ -----*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef SYSTEMZFRAMELOWERING_H
|
|
#define SYSTEMZFRAMELOWERING_H
|
|
|
|
#include "SystemZSubtarget.h"
|
|
#include "llvm/ADT/IndexedMap.h"
|
|
#include "llvm/Target/TargetFrameLowering.h"
|
|
|
|
namespace llvm {
|
|
class SystemZTargetMachine;
|
|
class SystemZSubtarget;
|
|
|
|
class SystemZFrameLowering : public TargetFrameLowering {
|
|
IndexedMap<unsigned> RegSpillOffsets;
|
|
|
|
protected:
|
|
const SystemZTargetMachine &TM;
|
|
const SystemZSubtarget &STI;
|
|
|
|
public:
|
|
SystemZFrameLowering(const SystemZTargetMachine &tm,
|
|
const SystemZSubtarget &sti);
|
|
|
|
// Override FrameLowering.
|
|
virtual void
|
|
processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
|
|
RegScavenger *RS) const LLVM_OVERRIDE;
|
|
virtual bool
|
|
spillCalleeSavedRegisters(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MBBI,
|
|
const std::vector<CalleeSavedInfo> &CSI,
|
|
const TargetRegisterInfo *TRI) const
|
|
LLVM_OVERRIDE;
|
|
virtual bool
|
|
restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MBBII,
|
|
const std::vector<CalleeSavedInfo> &CSI,
|
|
const TargetRegisterInfo *TRI) const
|
|
LLVM_OVERRIDE;
|
|
virtual void emitPrologue(MachineFunction &MF) const LLVM_OVERRIDE;
|
|
virtual void emitEpilogue(MachineFunction &MF,
|
|
MachineBasicBlock &MBB) const LLVM_OVERRIDE;
|
|
virtual bool hasFP(const MachineFunction &MF) const LLVM_OVERRIDE;
|
|
virtual int getFrameIndexOffset(const MachineFunction &MF,
|
|
int FI) const LLVM_OVERRIDE;
|
|
virtual bool hasReservedCallFrame(const MachineFunction &MF) const
|
|
LLVM_OVERRIDE;
|
|
virtual void
|
|
eliminateCallFramePseudoInstr(MachineFunction &MF,
|
|
MachineBasicBlock &MBB,
|
|
MachineBasicBlock::iterator MI) const
|
|
LLVM_OVERRIDE;
|
|
|
|
// The target-independent code automatically allocates save slots for
|
|
// call-saved GPRs. However, we don't need those slots for SystemZ,
|
|
// because the ABI sets aside GPR save slots in the caller-allocated part
|
|
// of the frame. Since the target-independent code puts this unneeded
|
|
// area at the top of the callee-allocated part of frame, we choose not
|
|
// to allocate it and adjust the offsets accordingly. Return the
|
|
// size of this unallocated area.
|
|
// FIXME: seems a bit hackish.
|
|
uint64_t getUnallocatedTopBytes(const MachineFunction &MF) const;
|
|
|
|
// Return the number of bytes in the callee-allocated part of the frame.
|
|
uint64_t getAllocatedStackSize(const MachineFunction &MF) const;
|
|
|
|
// Return the number of frame bytes that should be reserved for
|
|
// an emergency spill slot, for use by the register scaveneger.
|
|
// Return 0 if register scaveging won't be needed.
|
|
unsigned getEmergencySpillSlotSize(const MachineFunction &MF) const;
|
|
|
|
// Return the offset from the frame pointer of the emergency spill slot,
|
|
// which always fits within a 12-bit unsigned displacement field.
|
|
// Only valid if getEmergencySpillSlotSize(MF) returns nonzero.
|
|
unsigned getEmergencySpillSlotOffset(const MachineFunction &MF) const;
|
|
|
|
// Return the byte offset from the incoming stack pointer of Reg's
|
|
// ABI-defined save slot. Return 0 if no slot is defined for Reg.
|
|
unsigned getRegSpillOffset(unsigned Reg) const {
|
|
return RegSpillOffsets[Reg];
|
|
}
|
|
};
|
|
} // end namespace llvm
|
|
|
|
#endif
|