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//===-- 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
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