blob: fe23e418a3f16a67c704a5084b9c40e37ae183c4 [file] [log] [blame]
// WebAssemblyFrameLowering.h - TargetFrameLowering for WebAssembly -*- C++ -*-/
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
/// \file
/// This class implements WebAssembly-specific bits of
/// TargetFrameLowering class.
#include "llvm/CodeGen/TargetFrameLowering.h"
namespace llvm {
class MachineFrameInfo;
class WebAssemblyFrameLowering final : public TargetFrameLowering {
/// Size of the red zone for the user stack (leaf functions can use this much
/// space below the stack pointer without writing it back to memory).
// TODO: (ABI) Revisit and decide how large it should be.
static const size_t RedZoneSize = 128;
: TargetFrameLowering(StackGrowsDown, /*StackAlignment=*/16,
/*StackRealignable=*/true) {}
MachineBasicBlock::iterator eliminateCallFramePseudoInstr(
MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const override;
/// These methods insert prolog and epilog code into the function.
void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
bool hasFP(const MachineFunction &MF) const override;
bool hasReservedCallFrame(const MachineFunction &MF) const override;
bool hasBP(const MachineFunction &MF) const;
bool needsSP(const MachineFunction &MF, const MachineFrameInfo &MFI) const;
bool needsSPWriteback(const MachineFunction &MF,
const MachineFrameInfo &MFI) const;
} // end namespace llvm