//===-- X86MCAsmInfo.cpp - X86 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 X86MCAsmInfo properties.

//

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

#include "X86MCAsmInfo.h"

#include "llvm/ADT/Triple.h"

#include "llvm/MC/MCContext.h"

#include "llvm/MC/MCExpr.h"

#include "llvm/MC/MCSectionELF.h"

#include "llvm/MC/MCStreamer.h"

#include "llvm/Support/ELF.h"

using namespace llvm_ks;

//#include <iostream>

enum AsmWriterFlavorTy {

  // Note: This numbering has to match the GCC assembler dialects for inline

  // asm alternatives to work right.

  ATT = 0, Intel = 1

};

static AsmWriterFlavorTy AsmWriterFlavor = Intel; // ATT

static bool MarkedJTDataRegions = false;

X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &T) {

  bool is64Bit = T.getArch() == Triple::x86_64;

  if (is64Bit)

    PointerSize = CalleeSaveStackSlotSize = 8;

  AssemblerDialect = AsmWriterFlavor;

  TextAlignFillValue = 0x90;

  if (!is64Bit)

    Data64bitsDirective = nullptr;       // we can't emit a 64-bit unit

  // Use ## as a comment string so that .s files generated by llvm can go

  // through the GCC preprocessor without causing an error.  This is needed

  // because "clang foo.s" runs the C preprocessor, which is usually reserved

  // for .S files on other systems.  Perhaps this is because the file system

  // wasn't always case preserving or something.

  CommentString = "##";

  SupportsDebugInformation = true;

  UseDataRegionDirectives = MarkedJTDataRegions;

  // Exceptions handling

  ExceptionsType = ExceptionHandling::DwarfCFI;

  // old assembler lacks some directives

  // FIXME: this should really be a check on the assembler characteristics

  // rather than OS version

  if (T.isMacOSX() && T.isMacOSXVersionLT(10, 6))

    HasWeakDefCanBeHiddenDirective = false;

  // Assume ld64 is new enough that the abs-ified FDE relocs may be used

  // (actually, must, since otherwise the non-extern relocations we produce

  // overwhelm ld64's tiny little mind and it fails).

  DwarfFDESymbolsUseAbsDiff = true;

  UseIntegratedAssembler = true;

}

X86_64MCAsmInfoDarwin::X86_64MCAsmInfoDarwin(const Triple &Triple)

  : X86MCAsmInfoDarwin(Triple) {

}

X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {

  bool is64Bit = T.getArch() == Triple::x86_64;

  bool isX32 = T.getEnvironment() == Triple::GNUX32;

  // For ELF, x86-64 pointer size depends on the ABI.

  // For x86-64 without the x32 ABI, pointer size is 8. For x86 and for x86-64

  // with the x32 ABI, pointer size remains the default 4.

  PointerSize = (is64Bit && !isX32) ? 8 : 4;

  // OTOH, stack slot size is always 8 for x86-64, even with the x32 ABI.

  CalleeSaveStackSlotSize = is64Bit ? 8 : 4;

  AssemblerDialect = AsmWriterFlavor;

  TextAlignFillValue = 0x90;

  // Debug Information

  SupportsDebugInformation = true;

  // Exceptions handling

  ExceptionsType = ExceptionHandling::DwarfCFI;

  // Always enable the integrated assembler by default.

  // Clang also enabled it when the OS is Solaris but that is redundant here.

  UseIntegratedAssembler = true;

}

const MCExpr *

X86_64MCAsmInfoDarwin::getExprForPersonalitySymbol(const MCSymbol *Sym,

                                                   unsigned Encoding,

                                                   MCStreamer &Streamer) const {

  MCContext &Context = Streamer.getContext();

  const MCExpr *Res =

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

  const MCExpr *Four = MCConstantExpr::create(4, Context);

  return MCBinaryExpr::createAdd(Res, Four, Context);

}

X86MCAsmInfoMicrosoft::X86MCAsmInfoMicrosoft(const Triple &Triple) {

  if (Triple.getArch() == Triple::x86_64) {

    PrivateGlobalPrefix = ".L";

    PrivateLabelPrefix = ".L";

    PointerSize = 8;

    WinEHEncodingType = WinEH::EncodingType::Itanium;

  } else {

    // 32-bit X86 doesn't use CFI, so this isn't a real encoding type. It's just

    // a place holder that the Windows EHStreamer looks for to suppress CFI

    // output. In particular, usesWindowsCFI() returns false.

    WinEHEncodingType = WinEH::EncodingType::X86;

  }

  ExceptionsType = ExceptionHandling::WinEH;

  AssemblerDialect = AsmWriterFlavor;

  TextAlignFillValue = 0x90;

  AllowAtInName = true;

  UseIntegratedAssembler = true;

}

X86MCAsmInfoGNUCOFF::X86MCAsmInfoGNUCOFF(const Triple &Triple) {

  assert(Triple.isOSWindows() && "Windows is the only supported COFF target");

  if (Triple.getArch() == Triple::x86_64) {

    PrivateGlobalPrefix = ".L";

    PrivateLabelPrefix = ".L";

    PointerSize = 8;

    WinEHEncodingType = WinEH::EncodingType::Itanium;

    ExceptionsType = ExceptionHandling::WinEH;

  } else {

    ExceptionsType = ExceptionHandling::DwarfCFI;

  }

  AssemblerDialect = AsmWriterFlavor;

  TextAlignFillValue = 0x90;

  UseIntegratedAssembler = true;

}