//===-- llvm/ADT/Triple.h - Target triple helper class ----------*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

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

#ifndef LLVM_ADT_TRIPLE_H

#define LLVM_ADT_TRIPLE_H

#include "llvm/ADT/Twine.h"

// Some system headers or GCC predefined macros conflict with identifiers in

// this file.  Undefine them here.

#undef NetBSD

#undef mips

#undef sparc

namespace llvm {

/// Triple - Helper class for working with autoconf configuration names. For

/// historical reasons, we also call these 'triples' (they used to contain

/// exactly three fields).

///

/// Configuration names are strings in the canonical form:

///   ARCHITECTURE-VENDOR-OPERATING_SYSTEM

/// or

///   ARCHITECTURE-VENDOR-OPERATING_SYSTEM-ENVIRONMENT

///

/// This class is used for clients which want to support arbitrary

/// configuration names, but also want to implement certain special

/// behavior for particular configurations. This class isolates the mapping

/// from the components of the configuration name to well known IDs.

///

/// At its core the Triple class is designed to be a wrapper for a triple

/// string; the constructor does not change or normalize the triple string.

/// Clients that need to handle the non-canonical triples that users often

/// specify should use the normalize method.

///

/// See autoconf/config.guess for a glimpse into what configuration names

/// look like in practice.

class Triple {

public:

  enum ArchType {

    UnknownArch,

    arm,            // ARM (little endian): arm, armv.*, xscale

    armeb,          // ARM (big endian): armeb

    aarch64,        // AArch64 (little endian): aarch64

    aarch64_be,     // AArch64 (big endian): aarch64_be

    aarch64_32,     // AArch64 (little endian) ILP32: aarch64_32

    arc,            // ARC: Synopsys ARC

    avr,            // AVR: Atmel AVR microcontroller

    bpfel,          // eBPF or extended BPF or 64-bit BPF (little endian)

    bpfeb,          // eBPF or extended BPF or 64-bit BPF (big endian)

    hexagon,        // Hexagon: hexagon

    mips,           // MIPS: mips, mipsallegrex, mipsr6

    mipsel,         // MIPSEL: mipsel, mipsallegrexe, mipsr6el

    mips64,         // MIPS64: mips64, mips64r6, mipsn32, mipsn32r6

    mips64el,       // MIPS64EL: mips64el, mips64r6el, mipsn32el, mipsn32r6el

    msp430,         // MSP430: msp430

    ppc,            // PPC: powerpc

    ppc64,          // PPC64: powerpc64, ppu

    ppc64le,        // PPC64LE: powerpc64le

    r600,           // R600: AMD GPUs HD2XXX - HD6XXX

    amdgcn,         // AMDGCN: AMD GCN GPUs

    riscv32,        // RISC-V (32-bit): riscv32

    riscv64,        // RISC-V (64-bit): riscv64

    sparc,          // Sparc: sparc

    sparcv9,        // Sparcv9: Sparcv9

    sparcel,        // Sparc: (endianness = little). NB: 'Sparcle' is a CPU variant

    systemz,        // SystemZ: s390x

    tce,            // TCE (http://tce.cs.tut.fi/): tce

    tcele,          // TCE little endian (http://tce.cs.tut.fi/): tcele

    thumb,          // Thumb (little endian): thumb, thumbv.*

    thumbeb,        // Thumb (big endian): thumbeb

    x86,            // X86: i[3-9]86

    x86_64,         // X86-64: amd64, x86_64

    xcore,          // XCore: xcore

    nvptx,          // NVPTX: 32-bit

    nvptx64,        // NVPTX: 64-bit

    le32,           // le32: generic little-endian 32-bit CPU (PNaCl)

    le64,           // le64: generic little-endian 64-bit CPU (PNaCl)

    amdil,          // AMDIL

    amdil64,        // AMDIL with 64-bit pointers

    hsail,          // AMD HSAIL

    hsail64,        // AMD HSAIL with 64-bit pointers

    spir,           // SPIR: standard portable IR for OpenCL 32-bit version

    spir64,         // SPIR: standard portable IR for OpenCL 64-bit version

    kalimba,        // Kalimba: generic kalimba

    shave,          // SHAVE: Movidius vector VLIW processors

    lanai,          // Lanai: Lanai 32-bit

    wasm32,         // WebAssembly with 32-bit pointers

    wasm64,         // WebAssembly with 64-bit pointers

    renderscript32, // 32-bit RenderScript

    renderscript64, // 64-bit RenderScript

    ve,             // NEC SX-Aurora Vector Engine

    LastArchType = ve

  };

  enum SubArchType {

    NoSubArch,

    ARMSubArch_v8_6a,

    ARMSubArch_v8_5a,

    ARMSubArch_v8_4a,

    ARMSubArch_v8_3a,

    ARMSubArch_v8_2a,

    ARMSubArch_v8_1a,

    ARMSubArch_v8,

    ARMSubArch_v8r,

    ARMSubArch_v8m_baseline,

    ARMSubArch_v8m_mainline,

    ARMSubArch_v8_1m_mainline,

    ARMSubArch_v7,

    ARMSubArch_v7em,

    ARMSubArch_v7m,

    ARMSubArch_v7s,

    ARMSubArch_v7k,

    ARMSubArch_v7ve,

    ARMSubArch_v6,

    ARMSubArch_v6m,

    ARMSubArch_v6k,

    ARMSubArch_v6t2,

    ARMSubArch_v5,

    ARMSubArch_v5te,

    ARMSubArch_v4t,

    KalimbaSubArch_v3,

    KalimbaSubArch_v4,

    KalimbaSubArch_v5,

    MipsSubArch_r6,

    PPCSubArch_spe

  };

  enum VendorType {

    UnknownVendor,

    Apple,

    PC,

    SCEI,

    BGP,

    BGQ,

    Freescale,

    IBM,

    ImaginationTechnologies,

    MipsTechnologies,

    NVIDIA,

    CSR,

    Myriad,

    AMD,

    Mesa,

    SUSE,

    OpenEmbedded,

    LastVendorType = OpenEmbedded

  };

  enum OSType {

    UnknownOS,

    Ananas,

    CloudABI,

    Darwin,

    DragonFly,

    FreeBSD,

    Fuchsia,

    IOS,

    KFreeBSD,

    Linux,

    Lv2,        // PS3

    MacOSX,

    NetBSD,

    OpenBSD,

    Solaris,

    Win32,

    Haiku,

    Minix,

    RTEMS,

    NaCl,       // Native Client

    CNK,        // BG/P Compute-Node Kernel

    AIX,

    CUDA,       // NVIDIA CUDA

    NVCL,       // NVIDIA OpenCL

    AMDHSA,     // AMD HSA Runtime

    PS4,

    ELFIAMCU,

    TvOS,       // Apple tvOS

    WatchOS,    // Apple watchOS

    Mesa3D,

    Contiki,

    AMDPAL,     // AMD PAL Runtime

    HermitCore, // HermitCore Unikernel/Multikernel

    Hurd,       // GNU/Hurd

    WASI,       // Experimental WebAssembly OS

    Emscripten,

    LastOSType = Emscripten

  };

  enum EnvironmentType {

    UnknownEnvironment,

    GNU,

    GNUABIN32,

    GNUABI64,

    GNUEABI,

    GNUEABIHF,

    GNUX32,

    CODE16,

    EABI,

    EABIHF,

    Android,

    Musl,

    MuslEABI,

    MuslEABIHF,

    MSVC,

    Itanium,

    Cygnus,

    CoreCLR,

    Simulator, // Simulator variants of other systems, e.g., Apple's iOS

    MacABI, // Mac Catalyst variant of Apple's iOS deployment target.

    LastEnvironmentType = MacABI

  };

  enum ObjectFormatType {

    UnknownObjectFormat,

    COFF,

    ELF,

    MachO,

    Wasm,

    XCOFF,

  };

private:

  std::string Data;

  /// The parsed arch type.

  ArchType Arch;

  /// The parsed subarchitecture type.

  SubArchType SubArch;

  /// The parsed vendor type.

  VendorType Vendor;

  /// The parsed OS type.

  OSType OS;

  /// The parsed Environment type.

  EnvironmentType Environment;

  /// The object format type.

  ObjectFormatType ObjectFormat;

public:

  /// @name Constructors

  /// @{

  /// Default constructor is the same as an empty string and leaves all

  /// triple fields unknown.

  Triple()

      : Data(), Arch(), SubArch(), Vendor(), OS(), Environment(),

        ObjectFormat() {}

  explicit Triple(const Twine &Str);

  Triple(const Twine &ArchStr, const Twine &VendorStr, const Twine &OSStr);

  Triple(const Twine &ArchStr, const Twine &VendorStr, const Twine &OSStr,

         const Twine &EnvironmentStr);

  bool operator==(const Triple &Other) const {

    return Arch == Other.Arch && SubArch == Other.SubArch &&

           Vendor == Other.Vendor && OS == Other.OS &&

           Environment == Other.Environment &&

           ObjectFormat == Other.ObjectFormat;

  }

  bool operator!=(const Triple &Other) const {

    return !(*this == Other);

  }

  /// @}

  /// @name Normalization

  /// @{

  /// normalize - Turn an arbitrary machine specification into the canonical

  /// triple form (or something sensible that the Triple class understands if

  /// nothing better can reasonably be done).  In particular, it handles the

  /// common case in which otherwise valid components are in the wrong order.

  static std::string normalize(StringRef Str);

  /// Return the normalized form of this triple's string.

  std::string normalize() const { return normalize(Data); }

  /// @}

  /// @name Typed Component Access

  /// @{

  /// getArch - Get the parsed architecture type of this triple.

  ArchType getArch() const { return Arch; }

  /// getSubArch - get the parsed subarchitecture type for this triple.

  SubArchType getSubArch() const { return SubArch; }

  /// getVendor - Get the parsed vendor type of this triple.

  VendorType getVendor() const { return Vendor; }

  /// getOS - Get the parsed operating system type of this triple.

  OSType getOS() const { return OS; }

  /// hasEnvironment - Does this triple have the optional environment

  /// (fourth) component?

  bool hasEnvironment() const {

    return getEnvironmentName() != "";

  }

  /// getEnvironment - Get the parsed environment type of this triple.

  EnvironmentType getEnvironment() const { return Environment; }

  /// Parse the version number from the OS name component of the

  /// triple, if present.

  ///

  /// For example, "fooos1.2.3" would return (1, 2, 3).

  ///

  /// If an entry is not defined, it will be returned as 0.

  void getEnvironmentVersion(unsigned &Major, unsigned &Minor,

                             unsigned &Micro) const;

  /// getFormat - Get the object format for this triple.

  ObjectFormatType getObjectFormat() const { return ObjectFormat; }

  /// getOSVersion - Parse the version number from the OS name component of the

  /// triple, if present.

  ///

  /// For example, "fooos1.2.3" would return (1, 2, 3).

  ///

  /// If an entry is not defined, it will be returned as 0.

  void getOSVersion(unsigned &Major, unsigned &Minor, unsigned &Micro) const;

  /// getOSMajorVersion - Return just the major version number, this is

  /// specialized because it is a common query.

  unsigned getOSMajorVersion() const {

    unsigned Maj, Min, Micro;

    getOSVersion(Maj, Min, Micro);

    return Maj;

  }

  /// getMacOSXVersion - Parse the version number as with getOSVersion and then

  /// translate generic "darwin" versions to the corresponding OS X versions.

  /// This may also be called with IOS triples but the OS X version number is

  /// just set to a constant 10.4.0 in that case.  Returns true if successful.

  bool getMacOSXVersion(unsigned &Major, unsigned &Minor,

                        unsigned &Micro) const;

  /// getiOSVersion - Parse the version number as with getOSVersion.  This should

  /// only be called with IOS or generic triples.

  void getiOSVersion(unsigned &Major, unsigned &Minor,

                     unsigned &Micro) const;

  /// getWatchOSVersion - Parse the version number as with getOSVersion.  This

  /// should only be called with WatchOS or generic triples.

  void getWatchOSVersion(unsigned &Major, unsigned &Minor,

                         unsigned &Micro) const;

  /// @}

  /// @name Direct Component Access

  /// @{

  const std::string &str() const { return Data; }

  const std::string &getTriple() const { return Data; }

  /// getArchName - Get the architecture (first) component of the

  /// triple.

  StringRef getArchName() const;

  /// getVendorName - Get the vendor (second) component of the triple.

  StringRef getVendorName() const;

  /// getOSName - Get the operating system (third) component of the

  /// triple.

  StringRef getOSName() const;

  /// getEnvironmentName - Get the optional environment (fourth)

  /// component of the triple, or "" if empty.

  StringRef getEnvironmentName() const;

  /// getOSAndEnvironmentName - Get the operating system and optional

  /// environment components as a single string (separated by a '-'

  /// if the environment component is present).

  StringRef getOSAndEnvironmentName() const;

  /// @}

  /// @name Convenience Predicates

  /// @{

  /// Test whether the architecture is 64-bit

  ///

  /// Note that this tests for 64-bit pointer width, and nothing else. Note

  /// that we intentionally expose only three predicates, 64-bit, 32-bit, and

  /// 16-bit. The inner details of pointer width for particular architectures

  /// is not summed up in the triple, and so only a coarse grained predicate

  /// system is provided.

  bool isArch64Bit() const;

  /// Test whether the architecture is 32-bit

  ///

  /// Note that this tests for 32-bit pointer width, and nothing else.

  bool isArch32Bit() const;

  /// Test whether the architecture is 16-bit

  ///

  /// Note that this tests for 16-bit pointer width, and nothing else.

  bool isArch16Bit() const;

  /// isOSVersionLT - Helper function for doing comparisons against version

  /// numbers included in the target triple.

  bool isOSVersionLT(unsigned Major, unsigned Minor = 0,

                     unsigned Micro = 0) const {

    unsigned LHS[3];

    getOSVersion(LHS[0], LHS[1], LHS[2]);

    if (LHS[0] != Major)

      return LHS[0] < Major;

    if (LHS[1] != Minor)

      return LHS[1] < Minor;

    if (LHS[2] != Micro)

      return LHS[2] < Micro;

    return false;

  }

  bool isOSVersionLT(const Triple &Other) const {

    unsigned RHS[3];

    Other.getOSVersion(RHS[0], RHS[1], RHS[2]);

    return isOSVersionLT(RHS[0], RHS[1], RHS[2]);

  }

  /// isMacOSXVersionLT - Comparison function for checking OS X version

  /// compatibility, which handles supporting skewed version numbering schemes

  /// used by the "darwin" triples.

  bool isMacOSXVersionLT(unsigned Major, unsigned Minor = 0,

                         unsigned Micro = 0) const {

    assert(isMacOSX() && "Not an OS X triple!");

    // If this is OS X, expect a sane version number.

    if (getOS() == Triple::MacOSX)

      return isOSVersionLT(Major, Minor, Micro);

    // Otherwise, compare to the "Darwin" number.

    assert(Major == 10 && "Unexpected major version");

    return isOSVersionLT(Minor + 4, Micro, 0);

  }

  /// isMacOSX - Is this a Mac OS X triple. For legacy reasons, we support both

  /// "darwin" and "osx" as OS X triples.

  bool isMacOSX() const {

    return getOS() == Triple::Darwin || getOS() == Triple::MacOSX;

  }

  /// Is this an iOS triple.

  /// Note: This identifies tvOS as a variant of iOS. If that ever

  /// changes, i.e., if the two operating systems diverge or their version

  /// numbers get out of sync, that will need to be changed.

  /// watchOS has completely different version numbers so it is not included.

  bool isiOS() const {

    return getOS() == Triple::IOS || isTvOS();

  }

  /// Is this an Apple tvOS triple.

  bool isTvOS() const {

    return getOS() == Triple::TvOS;

  }

  /// Is this an Apple watchOS triple.

  bool isWatchOS() const {

    return getOS() == Triple::WatchOS;

  }

  bool isWatchABI() const {

    return getSubArch() == Triple::ARMSubArch_v7k;

  }

  /// isOSDarwin - Is this a "Darwin" OS (macOS, iOS, tvOS or watchOS).

  bool isOSDarwin() const {

    return isMacOSX() || isiOS() || isWatchOS();

  }

  bool isSimulatorEnvironment() const {

    return getEnvironment() == Triple::Simulator;

  }

  bool isMacCatalystEnvironment() const {

    return getEnvironment() == Triple::MacABI;

  }

  bool isOSNetBSD() const {

    return getOS() == Triple::NetBSD;

  }

  bool isOSOpenBSD() const {

    return getOS() == Triple::OpenBSD;

  }

  bool isOSFreeBSD() const {

    return getOS() == Triple::FreeBSD;

  }

  bool isOSFuchsia() const {

    return getOS() == Triple::Fuchsia;

  }

  bool isOSDragonFly() const { return getOS() == Triple::DragonFly; }

  bool isOSSolaris() const {

    return getOS() == Triple::Solaris;

  }

  bool isOSIAMCU() const {

    return getOS() == Triple::ELFIAMCU;

  }

  bool isOSUnknown() const { return getOS() == Triple::UnknownOS; }

  bool isGNUEnvironment() const {

    EnvironmentType Env = getEnvironment();

    return Env == Triple::GNU || Env == Triple::GNUABIN32 ||

           Env == Triple::GNUABI64 || Env == Triple::GNUEABI ||

           Env == Triple::GNUEABIHF || Env == Triple::GNUX32;

  }

  bool isOSContiki() const {

    return getOS() == Triple::Contiki;

  }

  /// Tests whether the OS is Haiku.

  bool isOSHaiku() const {

    return getOS() == Triple::Haiku;

  }

  /// Tests whether the OS is Windows.

  bool isOSWindows() const {

    return getOS() == Triple::Win32;

  }

  /// Checks if the environment is MSVC.

  bool isKnownWindowsMSVCEnvironment() const {

    return isOSWindows() && getEnvironment() == Triple::MSVC;

  }

  /// Checks if the environment could be MSVC.

  bool isWindowsMSVCEnvironment() const {

    return isKnownWindowsMSVCEnvironment() ||

           (isOSWindows() && getEnvironment() == Triple::UnknownEnvironment);

  }

  bool isWindowsCoreCLREnvironment() const {

    return isOSWindows() && getEnvironment() == Triple::CoreCLR;

  }

  bool isWindowsItaniumEnvironment() const {

    return isOSWindows() && getEnvironment() == Triple::Itanium;

  }

  bool isWindowsCygwinEnvironment() const {

    return isOSWindows() && getEnvironment() == Triple::Cygnus;

  }

  bool isWindowsGNUEnvironment() const {

    return isOSWindows() && getEnvironment() == Triple::GNU;

  }

  /// Tests for either Cygwin or MinGW OS

  bool isOSCygMing() const {

    return isWindowsCygwinEnvironment() || isWindowsGNUEnvironment();

  }

  /// Is this a "Windows" OS targeting a "MSVCRT.dll" environment.

  bool isOSMSVCRT() const {

    return isWindowsMSVCEnvironment() || isWindowsGNUEnvironment() ||

           isWindowsItaniumEnvironment();

  }

  /// Tests whether the OS is NaCl (Native Client)

  bool isOSNaCl() const {

    return getOS() == Triple::NaCl;

  }

  /// Tests whether the OS is Linux.

  bool isOSLinux() const {

    return getOS() == Triple::Linux;

  }

  /// Tests whether the OS is kFreeBSD.

  bool isOSKFreeBSD() const {

    return getOS() == Triple::KFreeBSD;

  }

  /// Tests whether the OS is Hurd.

  bool isOSHurd() const {

    return getOS() == Triple::Hurd;

  }

  /// Tests whether the OS is WASI.

  bool isOSWASI() const {

    return getOS() == Triple::WASI;

  }

  /// Tests whether the OS is Emscripten.

  bool isOSEmscripten() const {

    return getOS() == Triple::Emscripten;

  }

  /// Tests whether the OS uses glibc.

  bool isOSGlibc() const {

    return (getOS() == Triple::Linux || getOS() == Triple::KFreeBSD ||

            getOS() == Triple::Hurd) &&

           !isAndroid();

  }

  /// Tests whether the OS is AIX.

  bool isOSAIX() const {

    return getOS() == Triple::AIX;

  }

  /// Tests whether the OS uses the ELF binary format.

  bool isOSBinFormatELF() const {

    return getObjectFormat() == Triple::ELF;

  }

  /// Tests whether the OS uses the COFF binary format.

  bool isOSBinFormatCOFF() const {

    return getObjectFormat() == Triple::COFF;

  }

  /// Tests whether the environment is MachO.

  bool isOSBinFormatMachO() const {

    return getObjectFormat() == Triple::MachO;

  }

  /// Tests whether the OS uses the Wasm binary format.

  bool isOSBinFormatWasm() const {

    return getObjectFormat() == Triple::Wasm;

  }

  /// Tests whether the OS uses the XCOFF binary format.

  bool isOSBinFormatXCOFF() const {

    return getObjectFormat() == Triple::XCOFF;

  }

  /// Tests whether the target is the PS4 CPU

  bool isPS4CPU() const {

    return getArch() == Triple::x86_64 &&

           getVendor() == Triple::SCEI &&

           getOS() == Triple::PS4;

  }

  /// Tests whether the target is the PS4 platform

  bool isPS4() const {

    return getVendor() == Triple::SCEI &&

           getOS() == Triple::PS4;

  }

  /// Tests whether the target is Android

  bool isAndroid() const { return getEnvironment() == Triple::Android; }

  bool isAndroidVersionLT(unsigned Major) const {

    assert(isAndroid() && "Not an Android triple!");

    unsigned Env[3];

    getEnvironmentVersion(Env[0], Env[1], Env[2]);

    // 64-bit targets did not exist before API level 21 (Lollipop).

    if (isArch64Bit() && Env[0] < 21)

      Env[0] = 21;

    return Env[0] < Major;

  }

  /// Tests whether the environment is musl-libc

  bool isMusl() const {

    return getEnvironment() == Triple::Musl ||

           getEnvironment() == Triple::MuslEABI ||

           getEnvironment() == Triple::MuslEABIHF;

  }

  /// Tests whether the target is SPIR (32- or 64-bit).

  bool isSPIR() const {

    return getArch() == Triple::spir || getArch() == Triple::spir64;

  }

  /// Tests whether the target is NVPTX (32- or 64-bit).

  bool isNVPTX() const {

    return getArch() == Triple::nvptx || getArch() == Triple::nvptx64;

  }

  /// Tests whether the target is AMDGCN

  bool isAMDGCN() const { return getArch() == Triple::amdgcn; }

  bool isAMDGPU() const {

    return getArch() == Triple::r600 || getArch() == Triple::amdgcn;

  }

  /// Tests whether the target is Thumb (little and big endian).

  bool isThumb() const {

    return getArch() == Triple::thumb || getArch() == Triple::thumbeb;

  }

  /// Tests whether the target is ARM (little and big endian).

  bool isARM() const {

    return getArch() == Triple::arm || getArch() == Triple::armeb;

  }

  /// Tests whether the target is AArch64 (little and big endian).

  bool isAArch64() const {

    return getArch() == Triple::aarch64 || getArch() == Triple::aarch64_be;

  }

  /// Tests whether the target is MIPS 32-bit (little and big endian).

  bool isMIPS32() const {

    return getArch() == Triple::mips || getArch() == Triple::mipsel;

  }

  /// Tests whether the target is MIPS 64-bit (little and big endian).

  bool isMIPS64() const {

    return getArch() == Triple::mips64 || getArch() == Triple::mips64el;

  }

  /// Tests whether the target is MIPS (little and big endian, 32- or 64-bit).

  bool isMIPS() const {

    return isMIPS32() || isMIPS64();

  }

  /// Tests whether the target is 64-bit PowerPC (little and big endian).

  bool isPPC64() const {

    return getArch() == Triple::ppc64 || getArch() == Triple::ppc64le;

  }

  /// Tests whether the target is RISC-V (32- and 64-bit).

  bool isRISCV() const {

    return getArch() == Triple::riscv32 || getArch() == Triple::riscv64;

  }

  /// Tests whether the target is x86 (32- or 64-bit).

  bool isX86() const {

    return getArch() == Triple::x86 || getArch() == Triple::x86_64;

  }

  /// Tests whether the target is VE

  bool isVE() const {

    return getArch() == Triple::ve;

  }

  /// Tests whether the target is wasm (32- and 64-bit).

  bool isWasm() const {

    return getArch() == Triple::wasm32 || getArch() == Triple::wasm64;

  }

  /// Tests whether the target supports comdat

  bool supportsCOMDAT() const {

    return !(isOSBinFormatMachO() || isOSBinFormatXCOFF());

  }

  /// Tests whether the target uses emulated TLS as default.

  bool hasDefaultEmulatedTLS() const {

    return isAndroid() || isOSOpenBSD() || isWindowsCygwinEnvironment();

  }

  /// @}

  /// @name Mutators

  /// @{

  /// setArch - Set the architecture (first) component of the triple

  /// to a known type.

  void setArch(ArchType Kind);

  /// setVendor - Set the vendor (second) component of the triple to a

  /// known type.

  void setVendor(VendorType Kind);

  /// setOS - Set the operating system (third) component of the triple

  /// to a known type.

  void setOS(OSType Kind);

  /// setEnvironment - Set the environment (fourth) component of the triple

  /// to a known type.

  void setEnvironment(EnvironmentType Kind);

  /// setObjectFormat - Set the object file format

  void setObjectFormat(ObjectFormatType Kind);

  /// setTriple - Set all components to the new triple \p Str.

  void setTriple(const Twine &Str);

  /// setArchName - Set the architecture (first) component of the

  /// triple by name.

  void setArchName(StringRef Str);

  /// setVendorName - Set the vendor (second) component of the triple

  /// by name.

  void setVendorName(StringRef Str);

  /// setOSName - Set the operating system (third) component of the

  /// triple by name.

  void setOSName(StringRef Str);

  /// setEnvironmentName - Set the optional environment (fourth)

  /// component of the triple by name.

  void setEnvironmentName(StringRef Str);

  /// setOSAndEnvironmentName - Set the operating system and optional

  /// environment components with a single string.

  void setOSAndEnvironmentName(StringRef Str);

  /// @}

  /// @name Helpers to build variants of a particular triple.

  /// @{

  /// Form a triple with a 32-bit variant of the current architecture.

  ///

  /// This can be used to move across "families" of architectures where useful.

  ///

  /// \returns A new triple with a 32-bit architecture or an unknown

  ///          architecture if no such variant can be found.

  llvm::Triple get32BitArchVariant() const;

  /// Form a triple with a 64-bit variant of the current architecture.

  ///

  /// This can be used to move across "families" of architectures where useful.

  ///

  /// \returns A new triple with a 64-bit architecture or an unknown

  ///          architecture if no such variant can be found.

  llvm::Triple get64BitArchVariant() const;

  /// Form a triple with a big endian variant of the current architecture.

  ///

  /// This can be used to move across "families" of architectures where useful.

  ///

  /// \returns A new triple with a big endian architecture or an unknown

  ///          architecture if no such variant can be found.

  llvm::Triple getBigEndianArchVariant() const;

  /// Form a triple with a little endian variant of the current architecture.

  ///

  /// This can be used to move across "families" of architectures where useful.

  ///

  /// \returns A new triple with a little endian architecture or an unknown

  ///          architecture if no such variant can be found.

  llvm::Triple getLittleEndianArchVariant() const;

  /// Get the (LLVM) name of the minimum ARM CPU for the arch we are targeting.

  ///

  /// \param Arch the architecture name (e.g., "armv7s"). If it is an empty

  /// string then the triple's arch name is used.

  StringRef getARMCPUForArch(StringRef Arch = StringRef()) const;

  /// Tests whether the target triple is little endian.

  ///

  /// \returns true if the triple is little endian, false otherwise.

  bool isLittleEndian() const;

  /// Test whether target triples are compatible.

  bool isCompatibleWith(const Triple &Other) const;

  /// Merge target triples.

  std::string merge(const Triple &Other) const;

  /// @}

  /// @name Static helpers for IDs.

  /// @{

  /// getArchTypeName - Get the canonical name for the \p Kind architecture.

  static StringRef getArchTypeName(ArchType Kind);

  /// getArchTypePrefix - Get the "prefix" canonical name for the \p Kind

  /// architecture. This is the prefix used by the architecture specific

  /// builtins, and is suitable for passing to \see

  /// Intrinsic::getIntrinsicForGCCBuiltin().

  ///

  /// \return - The architecture prefix, or 0 if none is defined.

  static StringRef getArchTypePrefix(ArchType Kind);

  /// getVendorTypeName - Get the canonical name for the \p Kind vendor.

  static StringRef getVendorTypeName(VendorType Kind);

  /// getOSTypeName - Get the canonical name for the \p Kind operating system.

  static StringRef getOSTypeName(OSType Kind);

  /// getEnvironmentTypeName - Get the canonical name for the \p Kind

  /// environment.

  static StringRef getEnvironmentTypeName(EnvironmentType Kind);

  /// @}

  /// @name Static helpers for converting alternate architecture names.

  /// @{

  /// getArchTypeForLLVMName - The canonical type for the given LLVM

  /// architecture name (e.g., "x86").

  static ArchType getArchTypeForLLVMName(StringRef Str);

  /// @}

};

} // End llvm namespace

#endif