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// 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
/// \brief This class implements WebAssembly-specific bits of
/// TargetFrameLowering class.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYFRAMELOWERING_H
#define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYFRAMELOWERING_H
#include "llvm/CodeGen/TargetFrameLowering.h"
namespace llvm {
class MachineFrameInfo;
class WebAssemblyFrameLowering final : public TargetFrameLowering {
public:
/// 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;
WebAssemblyFrameLowering()
: TargetFrameLowering(StackGrowsDown, /*StackAlignment=*/16,
/*LocalAreaOffset=*/0,
/*TransientStackAlignment=*/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;
private:
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
#endif
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