//===-- MCAsmInfo.cpp - Asm Info -------------------------------------------==//

//

//                     The LLVM Compiler Infrastructure

//

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

// License. See LICENSE.TXT for details.

//

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

//

// This file defines target asm properties related what form asm statements

// should take.

//

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

#include "llvm/MC/MCAsmInfo.h"

#include "llvm/MC/MCContext.h"

#include "llvm/MC/MCExpr.h"

#include "llvm/MC/MCStreamer.h"

#include "llvm/Support/DataTypes.h"

#include "llvm/Support/Dwarf.h"

#include <cctype>

#include <cstring>

using namespace llvm_ks;

MCAsmInfo::MCAsmInfo() {

  PointerSize = 4;

  CalleeSaveStackSlotSize = 4;

  IsLittleEndian = true;

  StackGrowsUp = false;

  HasSubsectionsViaSymbols = false;

  HasMachoZeroFillDirective = false;

  HasMachoTBSSDirective = false;

  HasStaticCtorDtorReferenceInStaticMode = false;

  MaxInstLength = 4;

  MinInstAlignment = 1;

  DollarIsPC = false;

  SeparatorString = ";";

  CommentString = "#";

  LabelSuffix = ":";

  UseAssignmentForEHBegin = false;

  NeedsLocalForSize = false;

  PrivateGlobalPrefix = "L";

  PrivateLabelPrefix = PrivateGlobalPrefix;

  LinkerPrivateGlobalPrefix = "";

  InlineAsmStart = "APP";

  InlineAsmEnd = "NO_APP";

  Code16Directive = ".code16";

  Code32Directive = ".code32";

  Code64Directive = ".code64";

  AssemblerDialect = 0;

  AllowAtInName = false;

  SupportsQuotedNames = true;

  UseDataRegionDirectives = false;

  ZeroDirective = "\t.zero\t";

  AsciiDirective = "\t.ascii\t";

  AscizDirective = "\t.asciz\t";

  Data8bitsDirective = "\t.byte\t";

  Data16bitsDirective = "\t.short\t";

  Data32bitsDirective = "\t.long\t";

  Data64bitsDirective = "\t.quad\t";

  SunStyleELFSectionSwitchSyntax = false;

  UsesELFSectionDirectiveForBSS = false;

  AlignmentIsInBytes = true;

  TextAlignFillValue = 0;

  GPRel64Directive = nullptr;

  GPRel32Directive = nullptr;

  GlobalDirective = "\t.globl\t";

  SetDirectiveSuppressesReloc = false;

  HasAggressiveSymbolFolding = true;

  COMMDirectiveAlignmentIsInBytes = true;

  LCOMMDirectiveAlignmentType = LCOMM::NoAlignment;

  HasFunctionAlignment = true;

  HasDotTypeDotSizeDirective = true;

  HasSingleParameterDotFile = true;

  HasIdentDirective = false;

  HasNoDeadStrip = false;

  WeakDirective = "\t.weak\t";

  WeakRefDirective = nullptr;

  HasWeakDefDirective = false;

  HasWeakDefCanBeHiddenDirective = false;

  HasLinkOnceDirective = false;

  HiddenVisibilityAttr = MCSA_Hidden;

  HiddenDeclarationVisibilityAttr = MCSA_Hidden;

  ProtectedVisibilityAttr = MCSA_Protected;

  SupportsDebugInformation = false;

  ExceptionsType = ExceptionHandling::None;

  WinEHEncodingType = WinEH::EncodingType::Invalid;

  DwarfUsesRelocationsAcrossSections = true;

  DwarfFDESymbolsUseAbsDiff = false;

  DwarfRegNumForCFI = false;

  NeedsDwarfSectionOffsetDirective = false;

  UseParensForSymbolVariant = false;

  UseLogicalShr = true;

  // FIXME: Clang's logic should be synced with the logic used to initialize

  //        this member and the two implementations should be merged.

  // For reference:

  // - Solaris always enables the integrated assembler by default

  //   - SparcELFMCAsmInfo and X86ELFMCAsmInfo are handling this case

  // - Windows always enables the integrated assembler by default

  //   - MCAsmInfoCOFF is handling this case, should it be MCAsmInfoMicrosoft?

  // - MachO targets always enables the integrated assembler by default

  //   - MCAsmInfoDarwin is handling this case

  // - Generic_GCC toolchains enable the integrated assembler on a per

  //   architecture basis.

  //   - The target subclasses for AArch64, ARM, and X86 handle these cases

  UseIntegratedAssembler = false;

  CompressDebugSections = false;

}

MCAsmInfo::~MCAsmInfo() {

}

bool MCAsmInfo::isSectionAtomizableBySymbols(const MCSection &Section) const {

  return false;

}

const MCExpr *

MCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,

                                       unsigned Encoding,

                                       MCStreamer &Streamer) const {

  return getExprForFDESymbol(Sym, Encoding, Streamer);

}

const MCExpr *

MCAsmInfo::getExprForFDESymbol(const MCSymbol *Sym,

                               unsigned Encoding,

                               MCStreamer &Streamer) const {

  if (!(Encoding & dwarf::DW_EH_PE_pcrel))

    return MCSymbolRefExpr::create(Sym, Streamer.getContext());

  MCContext &Context = Streamer.getContext();

  const MCExpr *Res = MCSymbolRefExpr::create(Sym, Context);

  MCSymbol *PCSym = Context.createTempSymbol();

  Streamer.EmitLabel(PCSym);

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

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

}

static bool isAcceptableChar(char C) {

  return (C >= 'a' && C <= 'z') || (C >= 'A' && C <= 'Z') ||

         (C >= '0' && C <= '9') || C == '_' || C == '$' || C == '.' || C == '@';

}

bool MCAsmInfo::isValidUnquotedName(StringRef Name) const {

  if (Name.empty())

    return false;

  // If any of the characters in the string is an unacceptable character, force

  // quotes.

  for (char C : Name) {

    if (!isAcceptableChar(C))

      return false;

  }

  return true;

}

bool MCAsmInfo::shouldOmitSectionDirective(StringRef SectionName) const {

  // FIXME: Does .section .bss/.data/.text work everywhere??

  return SectionName == ".text" || SectionName == ".data" ||

        (SectionName == ".bss" && !usesELFSectionDirectiveForBSS());

}