llvm/llvm/lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp

//===- lib/MC/AArch64ELFStreamer.cpp - ELF Object Output for AArch64 ------===//
//
// 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 file assembles .s files and emits AArch64 ELF .o object files. Different
// from generic ELF streamer in emitting mapping symbols ($x and $d) to delimit
// regions of data and code.
//
//===----------------------------------------------------------------------===//

#include "AArch64ELFStreamer.h"
#include "AArch64MCTargetDesc.h"
#include "AArch64TargetStreamer.h"
#include "AArch64WinCOFFStreamer.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCELFStreamer.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/MC/MCWinCOFFStreamer.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TargetParser/Triple.h"

usingnamespacellvm;

namespace {

class AArch64ELFStreamer;

class AArch64TargetAsmStreamer : public AArch64TargetStreamer { … };

AArch64TargetAsmStreamer::AArch64TargetAsmStreamer(MCStreamer &S,
                                                   formatted_raw_ostream &OS)
  : … { … }

void AArch64TargetAsmStreamer::emitInst(uint32_t Inst) { … }

/// Extend the generic ELFStreamer class so that it can emit mapping symbols at
/// the appropriate points in the object files. These symbols are defined in the
/// AArch64 ELF ABI:
///    infocenter.arm.com/help/topic/com.arm.doc.ihi0056a/IHI0056A_aaelf64.pdf
///
/// In brief: $x or $d should be emitted at the start of each contiguous region
/// of A64 code or data in a section. In practice, this emission does not rely
/// on explicit assembler directives but on inherent properties of the
/// directives doing the emission (e.g. ".byte" is data, "add x0, x0, x0" an
/// instruction).
///
/// As a result this system is orthogonal to the DataRegion infrastructure used
/// by MachO. Beware!
class AArch64ELFStreamer : public MCELFStreamer { … };
} // end anonymous namespace

AArch64ELFStreamer &AArch64TargetELFStreamer::getStreamer() { … }

void AArch64TargetELFStreamer::emitInst(uint32_t Inst) { … }

void AArch64TargetELFStreamer::emitDirectiveVariantPCS(MCSymbol *Symbol) { … }

void AArch64TargetELFStreamer::finish() { … }

MCTargetStreamer *
llvm::createAArch64AsmTargetStreamer(MCStreamer &S, formatted_raw_ostream &OS,
                                     MCInstPrinter *InstPrint) { … }

MCELFStreamer *
llvm::createAArch64ELFStreamer(MCContext &Context,
                               std::unique_ptr<MCAsmBackend> TAB,
                               std::unique_ptr<MCObjectWriter> OW,
                               std::unique_ptr<MCCodeEmitter> Emitter) { … }