llvm/llvm/lib/Target/PowerPC/MCTargetDesc/PPCXCOFFStreamer.cpp

//===-------- PPCXCOFFStreamer.cpp - XCOFF Object Output ------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This is a custom MCXCOFFStreamer for PowerPC.
//
// The purpose of the custom XCOFF streamer is to allow us to intercept
// instructions as they are being emitted and align all 8 byte instructions
// to a 64 byte boundary if required (by adding a 4 byte nop). This is important
// because 8 byte instructions are not allowed to cross 64 byte boundaries
// and by aligning anything that is within 4 bytes of the boundary we can
// guarantee that the 8 byte instructions do not cross that boundary.
//
//===----------------------------------------------------------------------===//

#include "PPCXCOFFStreamer.h"
#include "PPCMCCodeEmitter.h"
#include "llvm/BinaryFormat/XCOFF.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSectionXCOFF.h"
#include "llvm/MC/MCSymbolXCOFF.h"
#include "llvm/MC/TargetRegistry.h"

usingnamespacellvm;

PPCXCOFFStreamer::PPCXCOFFStreamer(MCContext &Context,
                                   std::unique_ptr<MCAsmBackend> MAB,
                                   std::unique_ptr<MCObjectWriter> OW,
                                   std::unique_ptr<MCCodeEmitter> Emitter)
    : … { … }

void PPCXCOFFStreamer::emitPrefixedInstruction(const MCInst &Inst,
                                               const MCSubtargetInfo &STI) { … }

void PPCXCOFFStreamer::emitInstruction(const MCInst &Inst,
                                       const MCSubtargetInfo &STI) { … }

MCXCOFFStreamer *
llvm::createPPCXCOFFStreamer(MCContext &Context,
                             std::unique_ptr<MCAsmBackend> MAB,
                             std::unique_ptr<MCObjectWriter> OW,
                             std::unique_ptr<MCCodeEmitter> Emitter) { … }