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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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****************************************************************************/
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#include "abi.h"

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#include <utils/fileutils.h>

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#include <QDebug>
#include <QtEndian>
#include <QFile>
#include <QString>
#include <QStringList>
#include <QSysInfo>
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/*!
    \class ProjectExplorer::Abi

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    \brief The Abi class represents the Application Binary Interface (ABI) of
    a target platform.
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    \sa ProjectExplorer::ToolChain
*/

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namespace ProjectExplorer {

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// --------------------------------------------------------------------------
// Helpers
// --------------------------------------------------------------------------

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static quint8 getUint8(const QByteArray &data, int pos)
{
    return static_cast<quint8>(data.at(pos));
}

static quint32 getLEUint32(const QByteArray &ba, int pos)
{
    Q_ASSERT(ba.size() >= pos + 3);
    return (static_cast<quint32>(static_cast<quint8>(ba.at(pos + 3))) << 24)
            + (static_cast<quint32>(static_cast<quint8>(ba.at(pos + 2)) << 16))
            + (static_cast<quint32>(static_cast<quint8>(ba.at(pos + 1))) << 8)
            + static_cast<quint8>(ba.at(pos));
}

static quint32 getBEUint32(const QByteArray &ba, int pos)
{
    Q_ASSERT(ba.size() >= pos + 3);
    return (static_cast<quint32>(static_cast<quint8>(ba.at(pos))) << 24)
            + (static_cast<quint32>(static_cast<quint8>(ba.at(pos + 1))) << 16)
            + (static_cast<quint32>(static_cast<quint8>(ba.at(pos + 2))) << 8)
            + static_cast<quint8>(ba.at(pos + 3));
}

static quint32 getLEUint16(const QByteArray &ba, int pos)
{
    Q_ASSERT(ba.size() >= pos + 1);
    return (static_cast<quint16>(static_cast<quint8>(ba.at(pos + 1))) << 8) + static_cast<quint8>(ba.at(pos));
}

static quint32 getBEUint16(const QByteArray &ba, int pos)
{
    Q_ASSERT(ba.size() >= pos + 1);
    return (static_cast<quint16>(static_cast<quint8>(ba.at(pos))) << 8) + static_cast<quint8>(ba.at(pos + 1));
}

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static Abi macAbiForCpu(quint32 type) {
    switch (type) {
    case 7: // CPU_TYPE_X86, CPU_TYPE_I386
        return Abi(Abi::X86Architecture, Abi::MacOS, Abi::GenericMacFlavor, Abi::MachOFormat, 32);
    case 0x01000000 +  7: // CPU_TYPE_X86_64
        return Abi(Abi::X86Architecture, Abi::MacOS, Abi::GenericMacFlavor, Abi::MachOFormat, 64);
    case 18: // CPU_TYPE_POWERPC
        return Abi(Abi::PowerPCArchitecture, Abi::MacOS, Abi::GenericMacFlavor, Abi::MachOFormat, 32);
    case 0x01000000 + 18: // CPU_TYPE_POWERPC64
        return Abi(Abi::PowerPCArchitecture, Abi::MacOS, Abi::GenericMacFlavor, Abi::MachOFormat, 32);
    case 12: // CPU_TYPE_ARM
        return Abi(Abi::ArmArchitecture, Abi::MacOS, Abi::GenericMacFlavor, Abi::MachOFormat, 32);
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    case 0x01000000 + 12: // CPU_TYPE_ARM64
        return Abi(Abi::ArmArchitecture, Abi::MacOS, Abi::GenericMacFlavor, Abi::MachOFormat, 64);
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    default:
        return Abi();
    }
}

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static QList<Abi> parseCoffHeader(const QByteArray &data)
{
    QList<Abi> result;
    if (data.size() < 20)
        return result;

    Abi::Architecture arch = Abi::UnknownArchitecture;
    Abi::OSFlavor flavor = Abi::UnknownFlavor;
    int width = 0;

    // Get machine field from COFF file header
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    quint16 machine = getLEUint16(data, 0);
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    switch (machine) {
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    case 0x01c0: // ARM LE
    case 0x01c2: // ARM or thumb
    case 0x01c4: // ARMv7 thumb
        arch = Abi::ArmArchitecture;
        width = 32;
        break;
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    case 0x8664: // x86_64
        arch = Abi::X86Architecture;
        width = 64;
        break;
    case 0x014c: // i386
        arch = Abi::X86Architecture;
        width = 32;
        break;
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    case 0x0166: // MIPS, little endian
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        arch = Abi::MipsArchitecture;
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        width = 32;
        break;
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    case 0x0200: // ia64
        arch = Abi::ItaniumArchitecture;
        width = 64;
        break;
    }

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    if (data.size() >= 24) {
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        // Get Major and Minor Image Version from optional header fields
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        quint8 minorLinker = data.at(23);
        switch (data.at(22)) {
        case 2:
        case 3: // not yet reached:-)
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            flavor = Abi::WindowsMSysFlavor;
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            break;
        case 8:
            flavor = Abi::WindowsMsvc2005Flavor;
            break;
        case 9:
            flavor = Abi::WindowsMsvc2008Flavor;
            break;
        case 10:
            flavor = Abi::WindowsMsvc2010Flavor;
            break;
        case 11:
            flavor = Abi::WindowsMsvc2012Flavor;
            break;
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        case 12:
            flavor = Abi::WindowsMsvc2013Flavor;
            break;
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        case 14:
            flavor = Abi::WindowsMsvc2015Flavor;
            break;
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        default: // Keep unknown flavor
            if (minorLinker != 0)
                flavor = Abi::WindowsMSysFlavor; // MSVC seems to avoid using minor numbers
            else
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                qWarning("%s: Unknown MSVC flavour encountered.", Q_FUNC_INFO);
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            break;
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        }
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    }

    if (arch != Abi::UnknownArchitecture && width != 0)
        result.append(Abi(arch, Abi::WindowsOS, flavor, Abi::PEFormat, width));

    return result;
}

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static QList<Abi> abiOf(const QByteArray &data)
{
    QList<Abi> result;
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    if (data.size() <= 8)
        return result;
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    if (data.size() >= 20
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            && getUint8(data, 0) == 0x7f && getUint8(data, 1) == 'E' && getUint8(data, 2) == 'L'
            && getUint8(data, 3) == 'F') {
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        // ELF format:
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        bool isLE = (getUint8(data, 5) == 1);
        quint16 machine = isLE ? getLEUint16(data, 18) : getBEUint16(data, 18);
        quint8 osAbi = getUint8(data, 7);
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        Abi::OS os = Abi::UnixOS;
        Abi::OSFlavor flavor = Abi::GenericUnixFlavor;
        // http://www.sco.com/developers/gabi/latest/ch4.eheader.html#elfid
        switch (osAbi) {
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#if defined(Q_OS_NETBSD)
        case 0: // NetBSD: ELFOSABI_NETBSD  2, however, NetBSD uses 0
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            os = Abi::BsdOS;
            flavor = Abi::NetBsdFlavor;
            break;
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#elif defined(Q_OS_OPENBSD)
        case 0: // OpenBSD: ELFOSABI_OPENBSD 12, however, OpenBSD uses 0
            os = Abi::BsdOS;
            flavor = Abi::OpenBsdFlavor;
            break;
#else
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        case 0: // no extra info available: Default to Linux:
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#endif
        case 3: // Linux:
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        case 97: // ARM, also linux most of the time.
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            os = Abi::LinuxOS;
            flavor = Abi::GenericLinuxFlavor;
            break;
        case 6: // Solaris:
            os = Abi::UnixOS;
            flavor = Abi::SolarisUnixFlavor;
            break;
        case 9: // FreeBSD:
            os = Abi::BsdOS;
            flavor = Abi::FreeBsdFlavor;
            break;
        }
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        switch (machine) {
        case 3: // EM_386
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            result.append(Abi(Abi::X86Architecture, os, flavor, Abi::ElfFormat, 32));
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            break;
        case 8: // EM_MIPS
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            result.append(Abi(Abi::MipsArchitecture, os, flavor, Abi::ElfFormat, 32));
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            break;
        case 20: // EM_PPC
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            result.append(Abi(Abi::PowerPCArchitecture, os, flavor, Abi::ElfFormat, 32));
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            break;
        case 21: // EM_PPC64
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            result.append(Abi(Abi::PowerPCArchitecture, os, flavor, Abi::ElfFormat, 64));
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            break;
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        case 40: // EM_ARM
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            result.append(Abi(Abi::ArmArchitecture, os, flavor, Abi::ElfFormat, 32));
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            break;
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        case 183: // EM_AARCH64
            result.append(Abi(Abi::ArmArchitecture, os, flavor, Abi::ElfFormat, 64));
            break;
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        case 62: // EM_X86_64
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            result.append(Abi(Abi::X86Architecture, os, flavor, Abi::ElfFormat, 64));
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            break;
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        case 42: // EM_SH
            result.append(Abi(Abi::ShArchitecture, os, flavor, Abi::ElfFormat, 32));
            break;
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        case 50: // EM_IA_64
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            result.append(Abi(Abi::ItaniumArchitecture, os, flavor, Abi::ElfFormat, 64));
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            break;
        default:
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            ;
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        }
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    } else if (((getUint8(data, 0) == 0xce || getUint8(data, 0) == 0xcf)
             && getUint8(data, 1) == 0xfa && getUint8(data, 2) == 0xed && getUint8(data, 3) == 0xfe
            )
            ||
            (getUint8(data, 0) == 0xfe && getUint8(data, 1) == 0xed && getUint8(data, 2) == 0xfa
             && (getUint8(data, 3) == 0xce || getUint8(data, 3) == 0xcf)
            )
           ) {
            // Mach-O format (Mac non-fat binary, 32 and 64bit magic):
            quint32 type = (getUint8(data, 1) ==  0xfa) ? getLEUint32(data, 4) : getBEUint32(data, 4);
            result.append(macAbiForCpu(type));
    } else if ((getUint8(data, 0) == 0xbe && getUint8(data, 1) == 0xba
                && getUint8(data, 2) == 0xfe && getUint8(data, 3) == 0xca)
               ||
               (getUint8(data, 0) == 0xca && getUint8(data, 1) == 0xfe
                && getUint8(data, 2) == 0xba && getUint8(data, 3) == 0xbe)
              ) {
        // Mach-0 format Fat binary header:
        bool isLE = (getUint8(data, 0) == 0xbe);
        quint32 count = isLE ? getLEUint32(data, 4) : getBEUint32(data, 4);
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        int pos = 8;
        for (quint32 i = 0; i < count; ++i) {
            if (data.size() <= pos + 4)
                break;

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            quint32 type = isLE ? getLEUint32(data, pos) : getBEUint32(data, pos);
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            result.append(macAbiForCpu(type));
            pos += 20;
        }
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    } else if (data.size() >= 64){
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        // Windows PE: values are LE (except for a few exceptions which we will not use here).
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        // MZ header first (ZM is also allowed, but rarely used)
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        const quint8 firstChar = getUint8(data, 0);
        const quint8 secondChar = getUint8(data, 1);
        if ((firstChar != 'M' || secondChar != 'Z') && (firstChar != 'Z' || secondChar != 'M'))
            return result;
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        // Get PE/COFF header position from MZ header:
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        qint32 pePos = getLEUint32(data, 60);
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        if (pePos <= 0 || data.size() < pePos + 4 + 20) // PE magic bytes plus COFF header
            return result;
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        if (getUint8(data, pePos) == 'P' && getUint8(data, pePos + 1) == 'E'
            && getUint8(data, pePos + 2) == 0 && getUint8(data, pePos + 3) == 0)
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            result = parseCoffHeader(data.mid(pePos + 4));
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    }
    return result;
}

// --------------------------------------------------------------------------
// Abi
// --------------------------------------------------------------------------

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Abi::Abi(const Architecture &a, const OS &o,
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         const OSFlavor &of, const BinaryFormat &f, unsigned char w) :
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    m_architecture(a), m_os(o), m_osFlavor(of), m_binaryFormat(f), m_wordWidth(w)
{
    switch (m_os) {
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    case Abi::UnknownOS:
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        m_osFlavor = UnknownFlavor;
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        break;
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    case Abi::LinuxOS:
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        if (m_osFlavor < GenericLinuxFlavor || m_osFlavor > AndroidLinuxFlavor)
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            m_osFlavor = UnknownFlavor;
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        break;
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    case Abi::BsdOS:
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        if (m_osFlavor < FreeBsdFlavor || m_osFlavor > OpenBsdFlavor)
            m_osFlavor = UnknownFlavor;
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        break;
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    case Abi::MacOS:
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        if (m_osFlavor < GenericMacFlavor || m_osFlavor > GenericMacFlavor)
            m_osFlavor = UnknownFlavor;
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        break;
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    case Abi::UnixOS:
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        if (m_osFlavor < GenericUnixFlavor || m_osFlavor > SolarisUnixFlavor)
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            m_osFlavor = UnknownFlavor;
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        break;
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    case Abi::WindowsOS:
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        if (m_osFlavor < WindowsMsvc2005Flavor || m_osFlavor > WindowsCEFlavor)
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            m_osFlavor = UnknownFlavor;
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        break;
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    case Abi::VxWorks:
        if (m_osFlavor != VxWorksFlavor)
            m_osFlavor = VxWorksFlavor;
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    }
}

Abi::Abi(const QString &abiString) :
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    m_architecture(UnknownArchitecture), m_os(UnknownOS),
    m_osFlavor(UnknownFlavor), m_binaryFormat(UnknownFormat), m_wordWidth(0)
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{
    QStringList abiParts = abiString.split(QLatin1Char('-'));
    if (abiParts.count() >= 1) {
        if (abiParts.at(0) == QLatin1String("unknown"))
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            m_architecture = UnknownArchitecture;
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        else if (abiParts.at(0) == QLatin1String("arm"))
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            m_architecture = ArmArchitecture;
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        else if (abiParts.at(0) == QLatin1String("aarch64"))
            m_architecture = ArmArchitecture;
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        else if (abiParts.at(0) == QLatin1String("x86"))
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            m_architecture = X86Architecture;
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        else if (abiParts.at(0) == QLatin1String("mips"))
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            m_architecture = MipsArchitecture;
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        else if (abiParts.at(0) == QLatin1String("ppc"))
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            m_architecture = PowerPCArchitecture;
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        else if (abiParts.at(0) == QLatin1String("itanium"))
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            m_architecture = ItaniumArchitecture;
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        else if (abiParts.at(0) == QLatin1String("sh"))
            m_architecture = ShArchitecture;
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        else
            return;
    }

    if (abiParts.count() >= 2) {
        if (abiParts.at(1) == QLatin1String("unknown"))
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            m_os = UnknownOS;
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        else if (abiParts.at(1) == QLatin1String("linux"))
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            m_os = LinuxOS;
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        else if (abiParts.at(1) == QLatin1String("bsd"))
            m_os = BsdOS;
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        else if (abiParts.at(1) == QLatin1String("macos"))
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            m_os = MacOS;
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        else if (abiParts.at(1) == QLatin1String("unix"))
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            m_os = UnixOS;
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        else if (abiParts.at(1) == QLatin1String("windows"))
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            m_os = WindowsOS;
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        else if (abiParts.at(1) == QLatin1String("vxworks"))
            m_os = VxWorks;
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        else
            return;
    }

    if (abiParts.count() >= 3) {
        if (abiParts.at(2) == QLatin1String("unknown"))
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            m_osFlavor = UnknownFlavor;
        else if (abiParts.at(2) == QLatin1String("generic") && m_os == LinuxOS)
            m_osFlavor = GenericLinuxFlavor;
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        else if (abiParts.at(2) == QLatin1String("android") && m_os == LinuxOS)
            m_osFlavor = AndroidLinuxFlavor;
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        else if (abiParts.at(2) == QLatin1String("freebsd") && m_os == BsdOS)
            m_osFlavor = FreeBsdFlavor;
        else if (abiParts.at(2) == QLatin1String("netbsd") && m_os == BsdOS)
            m_osFlavor = NetBsdFlavor;
        else if (abiParts.at(2) == QLatin1String("openbsd") && m_os == BsdOS)
            m_osFlavor = OpenBsdFlavor;
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        else if (abiParts.at(2) == QLatin1String("generic") && m_os == MacOS)
            m_osFlavor = GenericMacFlavor;
        else if (abiParts.at(2) == QLatin1String("generic") && m_os == UnixOS)
            m_osFlavor = GenericUnixFlavor;
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        else if (abiParts.at(2) == QLatin1String("solaris") && m_os == UnixOS)
            m_osFlavor = SolarisUnixFlavor;
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        else if (abiParts.at(2) == QLatin1String("msvc2005") && m_os == WindowsOS)
            m_osFlavor = WindowsMsvc2005Flavor;
        else if (abiParts.at(2) == QLatin1String("msvc2008") && m_os == WindowsOS)
            m_osFlavor = WindowsMsvc2008Flavor;
        else if (abiParts.at(2) == QLatin1String("msvc2010") && m_os == WindowsOS)
            m_osFlavor = WindowsMsvc2010Flavor;
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        else if (abiParts.at(2) == QLatin1String("msvc2012") && m_os == WindowsOS)
            m_osFlavor = WindowsMsvc2012Flavor;
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        else if (abiParts.at(2) == QLatin1String("msvc2013") && m_os == WindowsOS)
            m_osFlavor = WindowsMsvc2013Flavor;
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        else if (abiParts.at(2) == QLatin1String("msvc2015") && m_os == WindowsOS)
            m_osFlavor = WindowsMsvc2015Flavor;
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        else if (abiParts.at(2) == QLatin1String("msys") && m_os == WindowsOS)
            m_osFlavor = WindowsMSysFlavor;
        else if (abiParts.at(2) == QLatin1String("ce") && m_os == WindowsOS)
            m_osFlavor = WindowsCEFlavor;
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        else if (abiParts.at(2) == QLatin1String("vxworks") && m_os == VxWorks)
            m_osFlavor = VxWorksFlavor;
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        else
            return;
    }

    if (abiParts.count() >= 4) {
        if (abiParts.at(3) == QLatin1String("unknown"))
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            m_binaryFormat = UnknownFormat;
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        else if (abiParts.at(3) == QLatin1String("elf"))
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            m_binaryFormat = ElfFormat;
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        else if (abiParts.at(3) == QLatin1String("pe"))
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            m_binaryFormat = PEFormat;
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        else if (abiParts.at(3) == QLatin1String("mach_o"))
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            m_binaryFormat = MachOFormat;
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        else if (abiParts.at(3) == QLatin1String("qml_rt"))
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            m_binaryFormat = RuntimeQmlFormat;
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        else
            return;
    }

    if (abiParts.count() >= 5) {
        const QString &bits = abiParts.at(4);
        if (!bits.endsWith(QLatin1String("bit")))
            return;

        bool ok = false;
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        int bitCount = bits.leftRef(bits.count() - 3).toInt(&ok);
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        if (!ok)
            return;
        if (bitCount != 8 && bitCount != 16 && bitCount != 32 && bitCount != 64)
            return;
        m_wordWidth = bitCount;
    }
}

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Abi Abi::abiFromTargetTriplet(const QString &triple)
{
    QString machine = triple.toLower();
    if (machine.isEmpty())
        return Abi();

    QStringList parts = machine.split(QRegExp(QLatin1String("[ /-]")));

    Abi::Architecture arch = Abi::UnknownArchitecture;
    Abi::OS os = Abi::UnknownOS;
    Abi::OSFlavor flavor = Abi::UnknownFlavor;
    Abi::BinaryFormat format = Abi::UnknownFormat;
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    unsigned char width = 0;
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    int unknownCount = 0;

    foreach (const QString &p, parts) {
        if (p == QLatin1String("unknown") || p == QLatin1String("pc") || p == QLatin1String("none")
                || p == QLatin1String("gnu") || p == QLatin1String("uclibc")
                || p == QLatin1String("86_64") || p == QLatin1String("redhat")
                || p == QLatin1String("gnueabi") || p == QLatin1String("w64")) {
            continue;
        } else if (p == QLatin1String("i386") || p == QLatin1String("i486") || p == QLatin1String("i586")
                   || p == QLatin1String("i686") || p == QLatin1String("x86")) {
            arch = Abi::X86Architecture;
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            width = 32;
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        } else if (p.startsWith(QLatin1String("arm"))) {
            arch = Abi::ArmArchitecture;
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            width = p.contains(QLatin1String("64")) ? 64 : 32;
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        } else if (p.startsWith(QLatin1String("aarch64"))) {
            arch = Abi::ArmArchitecture;
            width = 64;
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        } else if (p.startsWith(QLatin1String("mips"))) {
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            arch = Abi::MipsArchitecture;
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            width = p.contains(QLatin1String("64")) ? 64 : 32;
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        } else if (p == QLatin1String("x86_64") || p == QLatin1String("amd64")) {
            arch = Abi::X86Architecture;
            width = 64;
        } else if (p == QLatin1String("powerpc64")) {
            arch = Abi::PowerPCArchitecture;
            width = 64;
        } else if (p == QLatin1String("powerpc")) {
            arch = Abi::PowerPCArchitecture;
            width = 32;
        } else if (p == QLatin1String("linux") || p == QLatin1String("linux6e")) {
            os = Abi::LinuxOS;
            if (flavor == Abi::UnknownFlavor)
                flavor = Abi::GenericLinuxFlavor;
            format = Abi::ElfFormat;
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        } else if (p == QLatin1String("android")) {
            flavor = Abi::AndroidLinuxFlavor;
        } else if (p == QLatin1String("androideabi")) {
            flavor = Abi::AndroidLinuxFlavor;
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        } else if (p.startsWith(QLatin1String("freebsd"))) {
            os = Abi::BsdOS;
            if (flavor == Abi::UnknownFlavor)
                flavor = Abi::FreeBsdFlavor;
            format = Abi::ElfFormat;
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        } else if (p.startsWith(QLatin1String("openbsd"))) {
            os = Abi::BsdOS;
            if (flavor == Abi::UnknownFlavor)
                flavor = Abi::OpenBsdFlavor;
            format = Abi::ElfFormat;
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        } else if (p == QLatin1String("mingw32") || p == QLatin1String("win32")
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                   || p == QLatin1String("mingw32msvc") || p == QLatin1String("msys")
                   || p == QLatin1String("cygwin")) {
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            arch = Abi::X86Architecture;
            os = Abi::WindowsOS;
            flavor = Abi::WindowsMSysFlavor;
            format = Abi::PEFormat;
        } else if (p == QLatin1String("apple")) {
            os = Abi::MacOS;
            flavor = Abi::GenericMacFlavor;
            format = Abi::MachOFormat;
        } else if (p == QLatin1String("darwin10")) {
            width = 64;
        } else if (p == QLatin1String("darwin9")) {
            width = 32;
        } else if (p == QLatin1String("gnueabi")) {
            format = Abi::ElfFormat;
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        } else if (p == QLatin1String("wrs")) {
            continue;
        } else if (p == QLatin1String("vxworks")) {
            os = Abi::VxWorks;
            flavor = Abi::VxWorksFlavor;
            format = Abi::ElfFormat;
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        } else {
            ++unknownCount;
        }
    }

    return Abi(arch, os, flavor, format, width);
}

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QString Abi::toString() const
{
    QStringList dn;
    dn << toString(m_architecture);
    dn << toString(m_os);
    dn << toString(m_osFlavor);
    dn << toString(m_binaryFormat);
    dn << toString(m_wordWidth);

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    return dn.join(QLatin1Char('-'));
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}

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bool Abi::operator != (const Abi &other) const
{
    return !operator ==(other);
}

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bool Abi::operator == (const Abi &other) const
{
    return m_architecture == other.m_architecture
            && m_os == other.m_os
            && m_osFlavor == other.m_osFlavor
            && m_binaryFormat == other.m_binaryFormat
            && m_wordWidth == other.m_wordWidth;
}

bool Abi::isCompatibleWith(const Abi &other) const
{
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    bool isCompat = (architecture() == other.architecture() || other.architecture() == Abi::UnknownArchitecture)
                     && (os() == other.os() || other.os() == Abi::UnknownOS)
                     && (osFlavor() == other.osFlavor() || other.osFlavor() == Abi::UnknownFlavor)
                     && (binaryFormat() == other.binaryFormat() || other.binaryFormat() == Abi::UnknownFormat)
                     && ((wordWidth() == other.wordWidth() && wordWidth() != 0) || other.wordWidth() == 0);
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    // *-linux-generic-* is compatible with *-linux-* (both ways): This is for the benefit of
    // people building Qt themselves using e.g. a meego toolchain.
    //
    // We leave it to the specific targets to catch filter out the tool chains that do not
    // work for them.
    if (!isCompat && (architecture() == other.architecture() || other.architecture() == Abi::UnknownArchitecture)
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                  && ((os() == other.os()) && (os() == LinuxOS))
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                  && (osFlavor() == GenericLinuxFlavor || other.osFlavor() == GenericLinuxFlavor)
                  && (binaryFormat() == other.binaryFormat() || other.binaryFormat() == Abi::UnknownFormat)
                  && ((wordWidth() == other.wordWidth() && wordWidth() != 0) || other.wordWidth() == 0))
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        isCompat = true;
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    if (osFlavor() == AndroidLinuxFlavor || other.osFlavor() == AndroidLinuxFlavor)
        isCompat = (osFlavor() == other.osFlavor() && architecture() == other.architecture());
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    return isCompat;
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}

bool Abi::isValid() const
{
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    return m_architecture != UnknownArchitecture
            && m_os != UnknownOS
            && m_osFlavor != UnknownFlavor
            && m_binaryFormat != UnknownFormat
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            && m_wordWidth != 0;
}

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bool Abi::isNull() const
{
    return m_architecture == UnknownArchitecture
            && m_os == UnknownOS
            && m_osFlavor == UnknownFlavor
            && m_binaryFormat == UnknownFormat
            && m_wordWidth == 0;
}

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QString Abi::toString(const Architecture &a)
{
    switch (a) {
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    case ArmArchitecture:
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        return QLatin1String("arm");
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    case X86Architecture:
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        return QLatin1String("x86");
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    case MipsArchitecture:
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        return QLatin1String("mips");
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    case PowerPCArchitecture:
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        return QLatin1String("ppc");
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    case ItaniumArchitecture:
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        return QLatin1String("itanium");
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    case ShArchitecture:
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        return QLatin1String("sh");
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    case UnknownArchitecture: // fall through!
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    default:
        return QLatin1String("unknown");
    }
}

QString Abi::toString(const OS &o)
{
    switch (o) {
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    case LinuxOS:
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        return QLatin1String("linux");
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    case BsdOS:
        return QLatin1String("bsd");
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    case MacOS:
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        return QLatin1String("macos");
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    case UnixOS:
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        return QLatin1String("unix");
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    case WindowsOS:
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        return QLatin1String("windows");
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    case VxWorks:
        return QLatin1String("vxworks");
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    case UnknownOS: // fall through!
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    default:
        return QLatin1String("unknown");
    };
}

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QString Abi::toString(const OSFlavor &of)
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{
    switch (of) {
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    case Abi::GenericLinuxFlavor:
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        return QLatin1String("generic");
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    case Abi::AndroidLinuxFlavor:
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        return QLatin1String("android");
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    case Abi::FreeBsdFlavor:
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        return QLatin1String("freebsd");
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    case Abi::NetBsdFlavor:
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        return QLatin1String("netbsd");
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    case Abi::OpenBsdFlavor:
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        return QLatin1String("openbsd");
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    case Abi::GenericMacFlavor:
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        return QLatin1String("generic");
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    case Abi::GenericUnixFlavor:
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        return QLatin1String("generic");
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    case Abi::SolarisUnixFlavor:
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        return QLatin1String("solaris");
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    case Abi::WindowsMsvc2005Flavor:
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        return QLatin1String("msvc2005");
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    case Abi::WindowsMsvc2008Flavor:
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        return QLatin1String("msvc2008");
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    case Abi::WindowsMsvc2010Flavor:
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        return QLatin1String("msvc2010");
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    case Abi::WindowsMsvc2012Flavor:
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        return QLatin1String("msvc2012");
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    case Abi::WindowsMsvc2013Flavor:
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        return QLatin1String("msvc2013");
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    case Abi::WindowsMsvc2015Flavor:
        return QLatin1String("msvc2015");
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    case Abi::WindowsMSysFlavor:
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        return QLatin1String("msys");
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    case Abi::WindowsCEFlavor:
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        return QLatin1String("ce");
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    case Abi::VxWorksFlavor:
        return QLatin1String("vxworks");
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    case Abi::UnknownFlavor: // fall through!
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    default:
        return QLatin1String("unknown");
    }
}

QString Abi::toString(const BinaryFormat &bf)
{
    switch (bf) {
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    case ElfFormat:
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        return QLatin1String("elf");
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    case PEFormat:
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        return QLatin1String("pe");
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    case MachOFormat:
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        return QLatin1String("mach_o");
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    case RuntimeQmlFormat:
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        return QLatin1String("qml_rt");
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    case UnknownFormat: // fall through!
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    default:
        return QLatin1String("unknown");
    }
}

QString Abi::toString(int w)
{
    if (w == 0)
        return QLatin1String("unknown");
    return QString::fromLatin1("%1bit").arg(w);
}

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QList<Abi::OSFlavor> Abi::flavorsForOs(const Abi::OS &o)
{
    QList<OSFlavor> result;
    switch (o) {
    case BsdOS:
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        return result << FreeBsdFlavor << OpenBsdFlavor << NetBsdFlavor << UnknownFlavor;
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    case LinuxOS:
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        return result << GenericLinuxFlavor << AndroidLinuxFlavor << UnknownFlavor;
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    case MacOS:
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        return result << GenericMacFlavor << UnknownFlavor;
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    case UnixOS:
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        return result << GenericUnixFlavor << SolarisUnixFlavor << UnknownFlavor;
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    case WindowsOS:
        return result << WindowsMsvc2005Flavor << WindowsMsvc2008Flavor << WindowsMsvc2010Flavor
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                      << WindowsMsvc2012Flavor << WindowsMsvc2013Flavor << WindowsMsvc2015Flavor
                      << WindowsMSysFlavor << WindowsCEFlavor << UnknownFlavor;
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    case VxWorks:
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        return result << VxWorksFlavor << UnknownFlavor;
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    case UnknownOS:
        return result << UnknownFlavor;
    default:
        break;
    }
    return result;
}
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Abi Abi::hostAbi()
{
    Architecture arch = QTC_CPU; // define set by qmake
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    OS os = UnknownOS;
    OSFlavor subos = UnknownFlavor;
    BinaryFormat format = UnknownFormat;
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#if defined (Q_OS_WIN)
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    os = WindowsOS;
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#if _MSC_VER == 1900
    subos = WindowsMsvc2015Flavor;
#elif _MSC_VER == 1800
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    subos = WindowsMsvc2013Flavor;
#elif _MSC_VER == 1700
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    subos = WindowsMsvc2012Flavor;
#elif _MSC_VER == 1600
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    subos = WindowsMsvc2010Flavor;
#elif _MSC_VER == 1500
    subos = WindowsMsvc2008Flavor;
#elif _MSC_VER == 1400
    subos = WindowsMsvc2005Flavor;
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#elif defined (Q_CC_MINGW)
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    subos = WindowsMSysFlavor;
#endif
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    format = PEFormat;
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#elif defined (Q_OS_LINUX)
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    os = LinuxOS;
    subos = GenericLinuxFlavor;
    format = ElfFormat;
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#elif defined (Q_OS_MAC)
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    os = MacOS;
    subos = GenericMacFlavor;
    format = MachOFormat;
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#elif defined (Q_OS_BSD4)
    os = BsdOS;
# if defined (Q_OS_FREEBSD)
    subos = FreeBsdFlavor;
# elif defined (Q_OS_NETBSD)
    subos = NetBsdFlavor;
# elif defined (Q_OS_OPENBSD)
    subos = OpenBsdFlavor;
# endif
    format = ElfFormat;
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#endif

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    const Abi result(arch, os, subos, format, QSysInfo::WordSize);
    if (!result.isValid())
        qWarning("Unable to completely determine the host ABI (%s).",
                 qPrintable(result.toString()));
    return result;
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}

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QList<Abi> Abi::abisOfBinary(const Utils::FileName &path)
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{
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    QList<Abi> tmp;
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    if (path.isEmpty())
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        return tmp;
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    QFile f(path.toString());
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    if (!f.exists())
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        return tmp;
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    if (!f.open(QFile::ReadOnly))
        return tmp;

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    QByteArray data = f.read(1024);
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    if (data.size() >= 67
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            && getUint8(data, 0) == '!' && getUint8(data, 1) == '<' && getUint8(data, 2) == 'a'
            && getUint8(data, 3) == 'r' && getUint8(data, 4) == 'c' && getUint8(data, 5) == 'h'
            && getUint8(data, 6) == '>' && getUint8(data, 7) == 0x0a) {
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        // We got an ar file: possibly a static lib for ELF, PE or Mach-O
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        data = data.mid(8); // Cut of ar file magic
        quint64 offset = 8;

        while (!data.isEmpty()) {
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            if ((getUint8(data, 58) != 0x60 || getUint8(data, 59) != 0x0a)) {
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                qWarning() << path.toString() << ": Thought it was an ar-file, but it is not!";
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                break;
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            }
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            const QString fileName = QString::fromLocal8Bit(data.mid(0, 16));
            quint64 fileNameOffset = 0;
            if (fileName.startsWith(QLatin1String("#1/")))
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                fileNameOffset = fileName.midRef(3).toInt();
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            const QString fileLength = QString::fromLatin1(data.mid(48, 10));
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            int toSkip = 60 + fileNameOffset;
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            offset += fileLength.toInt() + 60 /* header */;
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            tmp.append(abiOf(data.mid(toSkip)));
            if (tmp.isEmpty() && fileName == QLatin1String("/0              "))
                tmp = parseCoffHeader(data.mid(toSkip, 20)); // This might be windws...

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            if (!tmp.isEmpty()
                    && tmp.at(0).binaryFormat() != Abi::MachOFormat)
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                break;
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            offset += (offset % 2); // ar is 2 byte aligned
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            f.seek(offset);
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            data = f.read(1024);
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        }
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    } else {
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        tmp = abiOf(data);
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    }
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    f.close();

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    // Remove duplicates:
    QList<Abi> result;
    foreach (const Abi &a, tmp) {
        if (!result.contains(a))
            result.append(a);
    }

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    return result;
}

} // namespace ProjectExplorer
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// Unit tests:
#ifdef WITH_TESTS
#   include <QTest>
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#   include <QFileInfo>
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#   include "projectexplorer.h"

void ProjectExplorer::ProjectExplorerPlugin::testAbiOfBinary_data()
{
    QTest::addColumn<QString>("file");
    QTest::addColumn<QStringList>("abis");

    QTest::newRow("no file")
            << QString()
            << (QStringList());
    QTest::newRow("non existing file")
            << QString::fromLatin1("/does/not/exist")
            << (QStringList());

    // Set up prefix for test data now that we can be sure to have some tests to run:
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    QString prefix = QString::fromLocal8Bit(qgetenv("QTC_TEST_EXTRADATALOCATION"));
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    if (prefix.isEmpty())
        return;
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    prefix += QLatin1String("/projectexplorer/abi");
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    QFileInfo fi(prefix);
    if (!fi.exists() || !fi.isDir())
        return;
    prefix = fi.absoluteFilePath();

    QTest::newRow("text file")
            << QString::fromLatin1("%1/broken/text.txt").arg(prefix)
            << (QStringList());

    QTest::newRow("static QtCore: win msvc2008")
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            << QString::fromLatin1("%1/static/win-msvc2008-release.lib").arg(prefix)
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            << (QStringList() << QString::fromLatin1("x86-windows-unknown-pe-32bit"));
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    QTest::newRow("static QtCore: win msvc2008 II")
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            << QString::fromLatin1("%1/static/win-msvc2008-release2.lib").arg(prefix)
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            << (QStringList() << QString::fromLatin1("x86-windows-unknown-pe-64bit"));
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    QTest::newRow("static QtCore: win msvc2008 (debug)")
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            << QString::fromLatin1("%1/static/win-msvc2008-debug.lib").arg(prefix)
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            << (QStringList() << QString::fromLatin1("x86-windows-unknown-pe-32bit"));
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    QTest::newRow("static QtCore: win mingw")
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            << QString::fromLatin1("%1/static/win-mingw.a").arg(prefix)
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            << (QStringList() << QString::fromLatin1("x86-windows-unknown-pe-32bit"));
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    QTest::newRow("static QtCore: mac (debug)")
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            << QString::fromLatin1("%1/static/mac-32bit-debug.a").arg(prefix)
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            << (QStringList() << QString::fromLatin1("x86-macos-generic-mach_o-32bit"));
    QTest::newRow("static QtCore: linux 32bit")
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            << QString::fromLatin1("%1/static/linux-32bit-release.a").arg(prefix)
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            << (QStringList() << QString::fromLatin1("x86-linux-generic-elf-32bit"));
    QTest::newRow("static QtCore: linux 64bit")
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            << QString::fromLatin1("%1/static/linux-64bit-release.a").arg(prefix)