File: Mips.cpp

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//===--- Mips.cpp - Tools Implementations -----------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "Mips.h"
#include "ToolChains/CommonArgs.h"
#include "clang/Driver/Driver.h"
#include "clang/Driver/DriverDiagnostic.h"
#include "clang/Driver/Options.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Option/ArgList.h"

using namespace clang::driver;
using namespace clang::driver::tools;
using namespace clang;
using namespace llvm::opt;

bool tools::isMipsArch(llvm::Triple::ArchType Arch) {
  return Arch == llvm::Triple::mips || Arch == llvm::Triple::mipsel ||
         Arch == llvm::Triple::mips64 || Arch == llvm::Triple::mips64el;
}

// Get CPU and ABI names. They are not independent
// so we have to calculate them together.
void mips::getMipsCPUAndABI(const ArgList &Args, const llvm::Triple &Triple,
                            StringRef &CPUName, StringRef &ABIName) {
  const char *DefMips32CPU = "mips32r2";
  const char *DefMips64CPU = "mips64r2";

  // MIPS32r6 is the default for mips(el)?-img-linux-gnu and MIPS64r6 is the
  // default for mips64(el)?-img-linux-gnu.
  if (Triple.getVendor() == llvm::Triple::ImaginationTechnologies &&
      Triple.getEnvironment() == llvm::Triple::GNU) {
    DefMips32CPU = "mips32r6";
    DefMips64CPU = "mips64r6";
  }

  // MIPS64r6 is the default for Android MIPS64 (mips64el-linux-android).
  if (Triple.isAndroid()) {
    DefMips32CPU = "mips32";
    DefMips64CPU = "mips64r6";
  }

  // MIPS3 is the default for mips64*-unknown-openbsd.
  if (Triple.getOS() == llvm::Triple::OpenBSD)
    DefMips64CPU = "mips3";

  if (Arg *A = Args.getLastArg(clang::driver::options::OPT_march_EQ,
                               options::OPT_mcpu_EQ))
    CPUName = A->getValue();

  if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ)) {
    ABIName = A->getValue();
    // Convert a GNU style Mips ABI name to the name
    // accepted by LLVM Mips backend.
    ABIName = llvm::StringSwitch<llvm::StringRef>(ABIName)
                  .Case("32", "o32")
                  .Case("64", "n64")
                  .Default(ABIName);
  }

  // Setup default CPU and ABI names.
  if (CPUName.empty() && ABIName.empty()) {
    switch (Triple.getArch()) {
    default:
      llvm_unreachable("Unexpected triple arch name");
    case llvm::Triple::mips:
    case llvm::Triple::mipsel:
      CPUName = DefMips32CPU;
      break;
    case llvm::Triple::mips64:
    case llvm::Triple::mips64el:
      CPUName = DefMips64CPU;
      break;
    }
  }

  if (ABIName.empty() &&
      (Triple.getVendor() == llvm::Triple::MipsTechnologies ||
       Triple.getVendor() == llvm::Triple::ImaginationTechnologies)) {
    ABIName = llvm::StringSwitch<const char *>(CPUName)
                  .Case("mips1", "o32")
                  .Case("mips2", "o32")
                  .Case("mips3", "n64")
                  .Case("mips4", "n64")
                  .Case("mips5", "n64")
                  .Case("mips32", "o32")
                  .Case("mips32r2", "o32")
                  .Case("mips32r3", "o32")
                  .Case("mips32r5", "o32")
                  .Case("mips32r6", "o32")
                  .Case("mips64", "n64")
                  .Case("mips64r2", "n64")
                  .Case("mips64r3", "n64")
                  .Case("mips64r5", "n64")
                  .Case("mips64r6", "n64")
                  .Case("octeon", "n64")
                  .Case("p5600", "o32")
                  .Default("");
  }

  if (ABIName.empty()) {
    // Deduce ABI name from the target triple.
    if (Triple.getArch() == llvm::Triple::mips ||
        Triple.getArch() == llvm::Triple::mipsel)
      ABIName = "o32";
    else
      ABIName = "n64";
  }

  if (CPUName.empty()) {
    // Deduce CPU name from ABI name.
    CPUName = llvm::StringSwitch<const char *>(ABIName)
                  .Case("o32", DefMips32CPU)
                  .Cases("n32", "n64", DefMips64CPU)
                  .Default("");
  }

  // FIXME: Warn on inconsistent use of -march and -mabi.
}

std::string mips::getMipsABILibSuffix(const ArgList &Args,
                                      const llvm::Triple &Triple) {
  StringRef CPUName, ABIName;
  tools::mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
  return llvm::StringSwitch<std::string>(ABIName)
      .Case("o32", "")
      .Case("n32", "32")
      .Case("n64", "64");
}

// Convert ABI name to the GNU tools acceptable variant.
StringRef mips::getGnuCompatibleMipsABIName(StringRef ABI) {
  return llvm::StringSwitch<llvm::StringRef>(ABI)
      .Case("o32", "32")
      .Case("n64", "64")
      .Default(ABI);
}

// Select the MIPS float ABI as determined by -msoft-float, -mhard-float,
// and -mfloat-abi=.
mips::FloatABI mips::getMipsFloatABI(const Driver &D, const ArgList &Args) {
  mips::FloatABI ABI = mips::FloatABI::Invalid;
  if (Arg *A =
          Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float,
                          options::OPT_mfloat_abi_EQ)) {
    if (A->getOption().matches(options::OPT_msoft_float))
      ABI = mips::FloatABI::Soft;
    else if (A->getOption().matches(options::OPT_mhard_float))
      ABI = mips::FloatABI::Hard;
    else {
      ABI = llvm::StringSwitch<mips::FloatABI>(A->getValue())
                .Case("soft", mips::FloatABI::Soft)
                .Case("hard", mips::FloatABI::Hard)
                .Default(mips::FloatABI::Invalid);
      if (ABI == mips::FloatABI::Invalid && !StringRef(A->getValue()).empty()) {
        D.Diag(clang::diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args);
        ABI = mips::FloatABI::Hard;
      }
    }
  }

  // If unspecified, choose the default based on the platform.
  if (ABI == mips::FloatABI::Invalid) {
    // Assume "hard", because it's a default value used by gcc.
    // When we start to recognize specific target MIPS processors,
    // we will be able to select the default more correctly.
    ABI = mips::FloatABI::Hard;
  }

  assert(ABI != mips::FloatABI::Invalid && "must select an ABI");
  return ABI;
}

void mips::getMIPSTargetFeatures(const Driver &D, const llvm::Triple &Triple,
                                 const ArgList &Args,
                                 std::vector<StringRef> &Features) {
  StringRef CPUName;
  StringRef ABIName;
  getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
  ABIName = getGnuCompatibleMipsABIName(ABIName);

  // Historically, PIC code for MIPS was associated with -mabicalls, a.k.a
  // SVR4 abicalls. Static code does not use SVR4 calling sequences. An ABI
  // extension was developed by Richard Sandiford & Code Sourcery to support
  // static code calling PIC code (CPIC). For O32 and N32 this means we have
  // several combinations of PIC/static and abicalls. Pure static, static
  // with the CPIC extension, and pure PIC code.

  // At final link time, O32 and N32 with CPIC will have another section
  // added to the binary which contains the stub functions to perform
  // any fixups required for PIC code.

  // For N64, the situation is more regular: code can either be static
  // (non-abicalls) or PIC (abicalls). GCC has traditionally picked PIC code
  // code for N64. Since Clang has already built the relocation model portion
  // of the commandline, we pick add +noabicalls feature in the N64 static
  // case.

  // The is another case to be accounted for: -msym32, which enforces that all
  // symbols have 32 bits in size. In this case, N64 can in theory use CPIC
  // but it is unsupported.

  // The combinations for N64 are:
  // a) Static without abicalls and 64bit symbols.
  // b) Static with abicalls and 32bit symbols.
  // c) PIC with abicalls and 64bit symbols.

  // For case (a) we need to add +noabicalls for N64.

  bool IsN64 = ABIName == "64";
  bool NonPIC = false;

  Arg *LastPICArg = Args.getLastArg(options::OPT_fPIC, options::OPT_fno_PIC,
                                    options::OPT_fpic, options::OPT_fno_pic,
                                    options::OPT_fPIE, options::OPT_fno_PIE,
                                    options::OPT_fpie, options::OPT_fno_pie);
  if (LastPICArg) {
    Option O = LastPICArg->getOption();
    NonPIC =
        (O.matches(options::OPT_fno_PIC) || O.matches(options::OPT_fno_pic) ||
         O.matches(options::OPT_fno_PIE) || O.matches(options::OPT_fno_pie));
  }

  if (IsN64 && NonPIC)
    Features.push_back("+noabicalls");
  else
    AddTargetFeature(Args, Features, options::OPT_mno_abicalls,
                     options::OPT_mabicalls, "noabicalls");

  mips::FloatABI FloatABI = mips::getMipsFloatABI(D, Args);
  if (FloatABI == mips::FloatABI::Soft) {
    // FIXME: Note, this is a hack. We need to pass the selected float
    // mode to the MipsTargetInfoBase to define appropriate macros there.
    // Now it is the only method.
    Features.push_back("+soft-float");
  }

  if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) {
    StringRef Val = StringRef(A->getValue());
    if (Val == "2008") {
      if (mips::getSupportedNanEncoding(CPUName) & mips::Nan2008)
        Features.push_back("+nan2008");
      else {
        Features.push_back("-nan2008");
        D.Diag(diag::warn_target_unsupported_nan2008) << CPUName;
      }
    } else if (Val == "legacy") {
      if (mips::getSupportedNanEncoding(CPUName) & mips::NanLegacy)
        Features.push_back("-nan2008");
      else {
        Features.push_back("+nan2008");
        D.Diag(diag::warn_target_unsupported_nanlegacy) << CPUName;
      }
    } else
      D.Diag(diag::err_drv_unsupported_option_argument)
          << A->getOption().getName() << Val;
  }

  AddTargetFeature(Args, Features, options::OPT_msingle_float,
                   options::OPT_mdouble_float, "single-float");
  AddTargetFeature(Args, Features, options::OPT_mips16, options::OPT_mno_mips16,
                   "mips16");
  AddTargetFeature(Args, Features, options::OPT_mmicromips,
                   options::OPT_mno_micromips, "micromips");
  AddTargetFeature(Args, Features, options::OPT_mdsp, options::OPT_mno_dsp,
                   "dsp");
  AddTargetFeature(Args, Features, options::OPT_mdspr2, options::OPT_mno_dspr2,
                   "dspr2");
  AddTargetFeature(Args, Features, options::OPT_mmsa, options::OPT_mno_msa,
                   "msa");

  // Add the last -mfp32/-mfpxx/-mfp64, if none are given and the ABI is O32
  // pass -mfpxx, or if none are given and fp64a is default, pass fp64 and
  // nooddspreg.
  if (Arg *A = Args.getLastArg(options::OPT_mfp32, options::OPT_mfpxx,
                               options::OPT_mfp64)) {
    if (A->getOption().matches(options::OPT_mfp32))
      Features.push_back("-fp64");
    else if (A->getOption().matches(options::OPT_mfpxx)) {
      Features.push_back("+fpxx");
      Features.push_back("+nooddspreg");
    } else
      Features.push_back("+fp64");
  } else if (mips::shouldUseFPXX(Args, Triple, CPUName, ABIName, FloatABI)) {
    Features.push_back("+fpxx");
    Features.push_back("+nooddspreg");
  } else if (mips::isFP64ADefault(Triple, CPUName)) {
    Features.push_back("+fp64");
    Features.push_back("+nooddspreg");
  }

  AddTargetFeature(Args, Features, options::OPT_mno_odd_spreg,
                   options::OPT_modd_spreg, "nooddspreg");
  AddTargetFeature(Args, Features, options::OPT_mno_madd4, options::OPT_mmadd4,
                   "nomadd4");
  AddTargetFeature(Args, Features, options::OPT_mlong_calls,
                   options::OPT_mno_long_calls, "long-calls");
  AddTargetFeature(Args, Features, options::OPT_mmt, options::OPT_mno_mt,"mt");
}

mips::NanEncoding mips::getSupportedNanEncoding(StringRef &CPU) {
  // Strictly speaking, mips32r2 and mips64r2 are NanLegacy-only since Nan2008
  // was first introduced in Release 3. However, other compilers have
  // traditionally allowed it for Release 2 so we should do the same.
  return (NanEncoding)llvm::StringSwitch<int>(CPU)
      .Case("mips1", NanLegacy)
      .Case("mips2", NanLegacy)
      .Case("mips3", NanLegacy)
      .Case("mips4", NanLegacy)
      .Case("mips5", NanLegacy)
      .Case("mips32", NanLegacy)
      .Case("mips32r2", NanLegacy | Nan2008)
      .Case("mips32r3", NanLegacy | Nan2008)
      .Case("mips32r5", NanLegacy | Nan2008)
      .Case("mips32r6", Nan2008)
      .Case("mips64", NanLegacy)
      .Case("mips64r2", NanLegacy | Nan2008)
      .Case("mips64r3", NanLegacy | Nan2008)
      .Case("mips64r5", NanLegacy | Nan2008)
      .Case("mips64r6", Nan2008)
      .Default(NanLegacy);
}

bool mips::hasCompactBranches(StringRef &CPU) {
  // mips32r6 and mips64r6 have compact branches.
  return llvm::StringSwitch<bool>(CPU)
      .Case("mips32r6", true)
      .Case("mips64r6", true)
      .Default(false);
}

bool mips::hasMipsAbiArg(const ArgList &Args, const char *Value) {
  Arg *A = Args.getLastArg(options::OPT_mabi_EQ);
  return A && (A->getValue() == StringRef(Value));
}

bool mips::isUCLibc(const ArgList &Args) {
  Arg *A = Args.getLastArg(options::OPT_m_libc_Group);
  return A && A->getOption().matches(options::OPT_muclibc);
}

bool mips::isNaN2008(const ArgList &Args, const llvm::Triple &Triple) {
  if (Arg *NaNArg = Args.getLastArg(options::OPT_mnan_EQ))
    return llvm::StringSwitch<bool>(NaNArg->getValue())
        .Case("2008", true)
        .Case("legacy", false)
        .Default(false);

  // NaN2008 is the default for MIPS32r6/MIPS64r6.
  return llvm::StringSwitch<bool>(getCPUName(Args, Triple))
      .Cases("mips32r6", "mips64r6", true)
      .Default(false);

  return false;
}

bool mips::isFP64ADefault(const llvm::Triple &Triple, StringRef CPUName) {
  if (!Triple.isAndroid())
    return false;

  // Android MIPS32R6 defaults to FP64A.
  return llvm::StringSwitch<bool>(CPUName)
      .Case("mips32r6", true)
      .Default(false);
}

bool mips::isFPXXDefault(const llvm::Triple &Triple, StringRef CPUName,
                         StringRef ABIName, mips::FloatABI FloatABI) {
/*  if (Triple.getVendor() != llvm::Triple::ImaginationTechnologies &&
      Triple.getVendor() != llvm::Triple::MipsTechnologies &&
      !Triple.isAndroid())
    return false;*/

  if (ABIName != "32")
    return false;

  // FPXX shouldn't be used if either -msoft-float or -mfloat-abi=soft is
  // present.
  if (FloatABI == mips::FloatABI::Soft)
    return false;

  return llvm::StringSwitch<bool>(CPUName)
      .Cases("mips2", "mips3", "mips4", "mips5", true)
      .Cases("mips32", "mips32r2", "mips32r3", "mips32r5", true)
      .Cases("mips64", "mips64r2", "mips64r3", "mips64r5", true)
      .Default(false);
}

bool mips::shouldUseFPXX(const ArgList &Args, const llvm::Triple &Triple,
                         StringRef CPUName, StringRef ABIName,
                         mips::FloatABI FloatABI) {
  bool UseFPXX = isFPXXDefault(Triple, CPUName, ABIName, FloatABI);

  // FPXX shouldn't be used if -msingle-float is present.
  if (Arg *A = Args.getLastArg(options::OPT_msingle_float,
                               options::OPT_mdouble_float))
    if (A->getOption().matches(options::OPT_msingle_float))
      UseFPXX = false;

  return UseFPXX;
}