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//===-- X86TargetFrameLowering.h - Define frame lowering for X86 -*- C++ -*-==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class implements X86-specific bits of TargetFrameLowering class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
#define LLVM_LIB_TARGET_X86_X86FRAMELOWERING_H
#include "llvm/Target/TargetFrameLowering.h"
namespace llvm {
class X86FrameLowering : public TargetFrameLowering {
public:
explicit X86FrameLowering(StackDirection D, unsigned StackAl, int LAO)
: TargetFrameLowering(StackGrowsDown, StackAl, LAO) {}
/// Emit a call to the target's stack probe function. This is required for all
/// large stack allocations on Windows. The caller is required to materialize
/// the number of bytes to probe in RAX/EAX.
static void emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, DebugLoc DL);
void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
DebugLoc DL) 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;
void adjustForSegmentedStacks(MachineFunction &MF) const override;
void adjustForHiPEPrologue(MachineFunction &MF) const override;
void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS = nullptr) const override;
bool
assignCalleeSavedSpillSlots(MachineFunction &MF,
const TargetRegisterInfo *TRI,
std::vector<CalleeSavedInfo> &CSI) const override;
bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
const std::vector<CalleeSavedInfo> &CSI,
const TargetRegisterInfo *TRI) const override;
bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
const std::vector<CalleeSavedInfo> &CSI,
const TargetRegisterInfo *TRI) const override;
bool hasFP(const MachineFunction &MF) const override;
bool hasReservedCallFrame(const MachineFunction &MF) const override;
bool canSimplifyCallFramePseudos(const MachineFunction &MF) const override;
bool needsFrameIndexResolution(const MachineFunction &MF) const override;
int getFrameIndexOffset(const MachineFunction &MF, int FI) const override;
int getFrameIndexReference(const MachineFunction &MF, int FI,
unsigned &FrameReg) const override;
int getFrameIndexOffsetFromSP(const MachineFunction &MF, int FI) const;
int getFrameIndexReferenceFromSP(const MachineFunction &MF, int FI,
unsigned &FrameReg) const override;
void eliminateCallFramePseudoInstr(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const override;
private:
/// convertArgMovsToPushes - This method tries to convert a call sequence
/// that uses sub and mov instructions to put the argument onto the stack
/// into a series of pushes.
/// Returns true if the transformation succeeded, false if not.
bool convertArgMovsToPushes(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
uint64_t Amount) const;
};
} // End llvm namespace
#endif
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