//===-- AArch64MCAsmInfo.cpp - AArch64 asm properties ---------------------===//

//

//                     The LLVM Compiler Infrastructure

//

// This file is distributed under the University of Illinois Open Source

// License. See LICENSE.TXT for details.

//

//===----------------------------------------------------------------------===//

//

// This file contains the declarations of the AArch64MCAsmInfo properties.

//

//===----------------------------------------------------------------------===//

#include "AArch64MCAsmInfo.h"

#include "llvm/ADT/Triple.h"

#include "llvm/MC/MCContext.h"

#include "llvm/MC/MCExpr.h"

#include "llvm/MC/MCStreamer.h"

using namespace llvm_ks;

enum AsmWriterVariantTy {

  Default = -1,

  Generic = 0,

  Apple = 1

};

static AsmWriterVariantTy AsmWriterVariant = Default;

AArch64MCAsmInfoDarwin::AArch64MCAsmInfoDarwin() {

  // We prefer NEON instructions to be printed in the short form.

  AssemblerDialect = AsmWriterVariant == Default ? 1 : AsmWriterVariant;

  PrivateGlobalPrefix = "L";

  PrivateLabelPrefix = "L";

  SeparatorString = "%%";

  CommentString = ";";

  PointerSize = CalleeSaveStackSlotSize = 8;

  AlignmentIsInBytes = false;

  UsesELFSectionDirectiveForBSS = true;

  SupportsDebugInformation = true;

  UseDataRegionDirectives = true;

  ExceptionsType = ExceptionHandling::DwarfCFI;

}

const MCExpr *AArch64MCAsmInfoDarwin::getExprForPersonalitySymbol(

    const MCSymbol *Sym, unsigned Encoding, MCStreamer &Streamer) const {

  // On Darwin, we can reference dwarf symbols with foo@GOT-., which

  // is an indirect pc-relative reference. The default implementation

  // won't reference using the GOT, so we need this target-specific

  // version.

  MCContext &Context = Streamer.getContext();

  const MCExpr *Res =

      MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOT, Context);

  MCSymbol *PCSym = Context.createTempSymbol();

  Streamer.EmitLabel(PCSym);

  const MCExpr *PC = MCSymbolRefExpr::create(PCSym, Context);

  return MCBinaryExpr::createSub(Res, PC, Context);

}

AArch64MCAsmInfoELF::AArch64MCAsmInfoELF(const Triple &T) {

  if (T.getArch() == Triple::aarch64_be)

    IsLittleEndian = false;

  // We prefer NEON instructions to be printed in the short form.

  AssemblerDialect = AsmWriterVariant == Default ? 0 : AsmWriterVariant;

  PointerSize = 8;

  // ".comm align is in bytes but .align is pow-2."

  AlignmentIsInBytes = false;

  CommentString = "//";

  PrivateGlobalPrefix = ".L";

  PrivateLabelPrefix = ".L";

  Code32Directive = ".code\t32";

  Data16bitsDirective = "\t.hword\t";

  Data32bitsDirective = "\t.word\t";

  Data64bitsDirective = "\t.xword\t";

  UseDataRegionDirectives = false;

  WeakRefDirective = "\t.weak\t";

  SupportsDebugInformation = true;

  // Exceptions handling

  ExceptionsType = ExceptionHandling::DwarfCFI;

  UseIntegratedAssembler = true;

  HasIdentDirective = true;

}