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1//===-- AArch64MCAsmInfo.cpp - AArch64 asm properties ---------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8//9// This file contains the declarations of the AArch64MCAsmInfo properties.10//11//===----------------------------------------------------------------------===//12 13#include "AArch64MCAsmInfo.h"14#include "llvm/MC/MCContext.h"15#include "llvm/MC/MCExpr.h"16#include "llvm/MC/MCStreamer.h"17#include "llvm/MC/MCValue.h"18#include "llvm/Support/CommandLine.h"19#include "llvm/TargetParser/Triple.h"20using namespace llvm;21 22enum AsmWriterVariantTy {23  Default = -1,24  Generic = 0,25  Apple = 126};27 28static cl::opt<AsmWriterVariantTy> AsmWriterVariant(29    "aarch64-neon-syntax", cl::init(Default),30    cl::desc("Choose style of NEON code to emit from AArch64 backend:"),31    cl::values(clEnumValN(Generic, "generic", "Emit generic NEON assembly"),32               clEnumValN(Apple, "apple", "Emit Apple-style NEON assembly")));33 34const MCAsmInfo::AtSpecifier COFFAtSpecifiers[] = {35    {MCSymbolRefExpr::VK_COFF_IMGREL32, "IMGREL"},36    {AArch64::S_MACHO_PAGEOFF, "PAGEOFF"},37};38 39const MCAsmInfo::AtSpecifier ELFAtSpecifiers[] = {40    {AArch64::S_GOT, "GOT"},41    {AArch64::S_GOTPCREL, "GOTPCREL"},42    {AArch64::S_PLT, "PLT"},43    {AArch64::S_FUNCINIT, "FUNCINIT"},44};45 46const MCAsmInfo::AtSpecifier MachOAtSpecifiers[] = {47    {AArch64::S_MACHO_GOT, "GOT"},48    {AArch64::S_MACHO_GOTPAGE, "GOTPAGE"},49    {AArch64::S_MACHO_GOTPAGEOFF, "GOTPAGEOFF"},50    {AArch64::S_MACHO_PAGE, "PAGE"},51    {AArch64::S_MACHO_PAGEOFF, "PAGEOFF"},52    {AArch64::S_MACHO_TLVP, "TLVP"},53    {AArch64::S_MACHO_TLVPPAGE, "TLVPPAGE"},54    {AArch64::S_MACHO_TLVPPAGEOFF, "TLVPPAGEOFF"},55};56 57StringRef AArch64::getSpecifierName(AArch64::Specifier S) {58  // clang-format off59  switch (static_cast<uint32_t>(S)) {60  case AArch64::S_CALL:                return "";61  case AArch64::S_LO12:                return ":lo12:";62  case AArch64::S_ABS_G3:              return ":abs_g3:";63  case AArch64::S_ABS_G2:              return ":abs_g2:";64  case AArch64::S_ABS_G2_S:            return ":abs_g2_s:";65  case AArch64::S_ABS_G2_NC:           return ":abs_g2_nc:";66  case AArch64::S_ABS_G1:              return ":abs_g1:";67  case AArch64::S_ABS_G1_S:            return ":abs_g1_s:";68  case AArch64::S_ABS_G1_NC:           return ":abs_g1_nc:";69  case AArch64::S_ABS_G0:              return ":abs_g0:";70  case AArch64::S_ABS_G0_S:            return ":abs_g0_s:";71  case AArch64::S_ABS_G0_NC:           return ":abs_g0_nc:";72  case AArch64::S_PREL_G3:             return ":prel_g3:";73  case AArch64::S_PREL_G2:             return ":prel_g2:";74  case AArch64::S_PREL_G2_NC:          return ":prel_g2_nc:";75  case AArch64::S_PREL_G1:             return ":prel_g1:";76  case AArch64::S_PREL_G1_NC:          return ":prel_g1_nc:";77  case AArch64::S_PREL_G0:             return ":prel_g0:";78  case AArch64::S_PREL_G0_NC:          return ":prel_g0_nc:";79  case AArch64::S_DTPREL_G2:           return ":dtprel_g2:";80  case AArch64::S_DTPREL_G1:           return ":dtprel_g1:";81  case AArch64::S_DTPREL_G1_NC:        return ":dtprel_g1_nc:";82  case AArch64::S_DTPREL_G0:           return ":dtprel_g0:";83  case AArch64::S_DTPREL_G0_NC:        return ":dtprel_g0_nc:";84  case AArch64::S_DTPREL_HI12:         return ":dtprel_hi12:";85  case AArch64::S_DTPREL_LO12:         return ":dtprel_lo12:";86  case AArch64::S_DTPREL_LO12_NC:      return ":dtprel_lo12_nc:";87  case AArch64::S_TPREL_G2:            return ":tprel_g2:";88  case AArch64::S_TPREL_G1:            return ":tprel_g1:";89  case AArch64::S_TPREL_G1_NC:         return ":tprel_g1_nc:";90  case AArch64::S_TPREL_G0:            return ":tprel_g0:";91  case AArch64::S_TPREL_G0_NC:         return ":tprel_g0_nc:";92  case AArch64::S_TPREL_HI12:          return ":tprel_hi12:";93  case AArch64::S_TPREL_LO12:          return ":tprel_lo12:";94  case AArch64::S_TPREL_LO12_NC:       return ":tprel_lo12_nc:";95  case AArch64::S_TLSDESC_LO12:        return ":tlsdesc_lo12:";96  case AArch64::S_TLSDESC_AUTH_LO12:   return ":tlsdesc_auth_lo12:";97  case AArch64::S_ABS_PAGE:            return "";98  case AArch64::S_ABS_PAGE_NC:         return ":pg_hi21_nc:";99  case AArch64::S_GOT:                 return ":got:";100  case AArch64::S_GOT_PAGE:            return ":got:";101  case AArch64::S_GOT_PAGE_LO15:       return ":gotpage_lo15:";102  case AArch64::S_GOT_LO12:            return ":got_lo12:";103  case AArch64::S_GOTTPREL:            return ":gottprel:";104  case AArch64::S_GOTTPREL_PAGE:       return ":gottprel:";105  case AArch64::S_GOTTPREL_LO12_NC:    return ":gottprel_lo12:";106  case AArch64::S_GOTTPREL_G1:         return ":gottprel_g1:";107  case AArch64::S_GOTTPREL_G0_NC:      return ":gottprel_g0_nc:";108  case AArch64::S_TLSDESC:             return "";109  case AArch64::S_TLSDESC_PAGE:        return ":tlsdesc:";110  case AArch64::S_TLSDESC_AUTH:        return "";111  case AArch64::S_TLSDESC_AUTH_PAGE:   return ":tlsdesc_auth:";112  case AArch64::S_SECREL_LO12:         return ":secrel_lo12:";113  case AArch64::S_SECREL_HI12:         return ":secrel_hi12:";114  case AArch64::S_GOT_AUTH:            return ":got_auth:";115  case AArch64::S_GOT_AUTH_PAGE:       return ":got_auth:";116  case AArch64::S_GOT_AUTH_LO12:       return ":got_auth_lo12:";117  default:118    llvm_unreachable("Invalid relocation specifier");119  }120  // clang-format on121}122 123static bool evaluate(const MCSpecifierExpr &Expr, MCValue &Res,124                     const MCAssembler *Asm) {125  if (!Expr.getSubExpr()->evaluateAsRelocatable(Res, Asm))126    return false;127  Res.setSpecifier(Expr.getSpecifier());128  return !Res.getSubSym();129}130 131AArch64MCAsmInfoDarwin::AArch64MCAsmInfoDarwin(bool IsILP32) {132  // We prefer NEON instructions to be printed in the short, Apple-specific133  // form when targeting Darwin.134  AssemblerDialect = AsmWriterVariant == Default ? Apple : AsmWriterVariant;135 136  PrivateGlobalPrefix = "L";137  PrivateLabelPrefix = "L";138  SeparatorString = "%%";139  CommentString = ";";140  CalleeSaveStackSlotSize = 8;141  CodePointerSize = IsILP32 ? 4 : 8;142 143  AlignmentIsInBytes = false;144  UsesELFSectionDirectiveForBSS = true;145  SupportsDebugInformation = true;146  UseDataRegionDirectives = true;147  UseAtForSpecifier = false;148 149  ExceptionsType = ExceptionHandling::DwarfCFI;150 151  initializeAtSpecifiers(MachOAtSpecifiers);152}153 154const MCExpr *AArch64MCAsmInfoDarwin::getExprForPersonalitySymbol(155    const MCSymbol *Sym, unsigned Encoding, MCStreamer &Streamer) const {156  // On Darwin, we can reference dwarf symbols with foo@GOT-., which157  // is an indirect pc-relative reference. The default implementation158  // won't reference using the GOT, so we need this target-specific159  // version.160  MCContext &Context = Streamer.getContext();161  const MCExpr *Res =162      MCSymbolRefExpr::create(Sym, AArch64::S_MACHO_GOT, Context);163  MCSymbol *PCSym = Context.createTempSymbol();164  Streamer.emitLabel(PCSym);165  const MCExpr *PC = MCSymbolRefExpr::create(PCSym, Context);166  return MCBinaryExpr::createSub(Res, PC, Context);167}168 169void AArch64AuthMCExpr::print(raw_ostream &OS, const MCAsmInfo *MAI) const {170  bool WrapSubExprInParens = !isa<MCSymbolRefExpr>(getSubExpr());171  if (WrapSubExprInParens)172    OS << '(';173  MAI->printExpr(OS, *getSubExpr());174  if (WrapSubExprInParens)175    OS << ')';176 177  OS << "@AUTH(" << AArch64PACKeyIDToString(Key) << ',' << Discriminator;178  if (hasAddressDiversity())179    OS << ",addr";180  OS << ')';181}182 183void AArch64MCAsmInfoDarwin::printSpecifierExpr(184    raw_ostream &OS, const MCSpecifierExpr &Expr) const {185  if (auto *AE = dyn_cast<AArch64AuthMCExpr>(&Expr))186    return AE->print(OS, this);187  OS << AArch64::getSpecifierName(Expr.getSpecifier());188  printExpr(OS, *Expr.getSubExpr());189}190 191bool AArch64MCAsmInfoDarwin::evaluateAsRelocatableImpl(192    const MCSpecifierExpr &Expr, MCValue &Res, const MCAssembler *Asm) const {193  return evaluate(Expr, Res, Asm);194}195 196AArch64MCAsmInfoELF::AArch64MCAsmInfoELF(const Triple &T) {197  if (T.getArch() == Triple::aarch64_be)198    IsLittleEndian = false;199 200  // We prefer NEON instructions to be printed in the generic form when201  // targeting ELF.202  AssemblerDialect = AsmWriterVariant == Default ? Generic : AsmWriterVariant;203 204  CodePointerSize = T.getEnvironment() == Triple::GNUILP32 ? 4 : 8;205 206  // ".comm align is in bytes but .align is pow-2."207  AlignmentIsInBytes = false;208 209  CommentString = "//";210  PrivateGlobalPrefix = ".L";211  PrivateLabelPrefix = ".L";212 213  Data16bitsDirective = "\t.hword\t";214  Data32bitsDirective = "\t.word\t";215  Data64bitsDirective = "\t.xword\t";216 217  UseDataRegionDirectives = false;218  UseAtForSpecifier = false;219 220  WeakRefDirective = "\t.weak\t";221 222  SupportsDebugInformation = true;223 224  // Exceptions handling225  ExceptionsType = ExceptionHandling::DwarfCFI;226 227  HasIdentDirective = true;228 229  initializeAtSpecifiers(ELFAtSpecifiers);230}231 232void AArch64MCAsmInfoELF::printSpecifierExpr(233    raw_ostream &OS, const MCSpecifierExpr &Expr) const {234  if (auto *AE = dyn_cast<AArch64AuthMCExpr>(&Expr))235    return AE->print(OS, this);236  OS << AArch64::getSpecifierName(Expr.getSpecifier());237  printExpr(OS, *Expr.getSubExpr());238}239 240bool AArch64MCAsmInfoELF::evaluateAsRelocatableImpl(241    const MCSpecifierExpr &Expr, MCValue &Res, const MCAssembler *Asm) const {242  return evaluate(Expr, Res, Asm);243}244 245AArch64MCAsmInfoMicrosoftCOFF::AArch64MCAsmInfoMicrosoftCOFF() {246  PrivateGlobalPrefix = ".L";247  PrivateLabelPrefix = ".L";248 249  Data16bitsDirective = "\t.hword\t";250  Data32bitsDirective = "\t.word\t";251  Data64bitsDirective = "\t.xword\t";252 253  AlignmentIsInBytes = false;254  SupportsDebugInformation = true;255  CodePointerSize = 8;256 257  CommentString = "//";258  ExceptionsType = ExceptionHandling::WinEH;259  WinEHEncodingType = WinEH::EncodingType::Itanium;260 261  initializeAtSpecifiers(COFFAtSpecifiers);262}263 264void AArch64MCAsmInfoMicrosoftCOFF::printSpecifierExpr(265    raw_ostream &OS, const MCSpecifierExpr &Expr) const {266  OS << AArch64::getSpecifierName(Expr.getSpecifier());267  printExpr(OS, *Expr.getSubExpr());268}269 270bool AArch64MCAsmInfoMicrosoftCOFF::evaluateAsRelocatableImpl(271    const MCSpecifierExpr &Expr, MCValue &Res, const MCAssembler *Asm) const {272  return evaluate(Expr, Res, Asm);273}274 275AArch64MCAsmInfoGNUCOFF::AArch64MCAsmInfoGNUCOFF() {276  PrivateGlobalPrefix = ".L";277  PrivateLabelPrefix = ".L";278 279  Data16bitsDirective = "\t.hword\t";280  Data32bitsDirective = "\t.word\t";281  Data64bitsDirective = "\t.xword\t";282 283  AlignmentIsInBytes = false;284  SupportsDebugInformation = true;285  CodePointerSize = 8;286 287  CommentString = "//";288  ExceptionsType = ExceptionHandling::WinEH;289  WinEHEncodingType = WinEH::EncodingType::Itanium;290 291  initializeAtSpecifiers(COFFAtSpecifiers);292}293 294void AArch64MCAsmInfoGNUCOFF::printSpecifierExpr(295    raw_ostream &OS, const MCSpecifierExpr &Expr) const {296  OS << AArch64::getSpecifierName(Expr.getSpecifier());297  printExpr(OS, *Expr.getSubExpr());298}299 300bool AArch64MCAsmInfoGNUCOFF::evaluateAsRelocatableImpl(301    const MCSpecifierExpr &Expr, MCValue &Res, const MCAssembler *Asm) const {302  return evaluate(Expr, Res, Asm);303}304