    {-# LANGUAGE LambdaCase, ScopedTypeVariables #-}

    -- | Platform architecture and OS
    --
    -- We need it in ghc-boot because ghc-pkg needs it.
    module GHC.Platform.ArchOS
       ( ArchOS(..)
       , Arch(..)
       , OS(..)
       , ArmISA(..)
       , ArmISAExt(..)
       , ArmABI(..)
       , PPC_64ABI(..)
       , stringEncodeArch
       , stringEncodeOS
       )
    where

    import Prelude -- See Note [Why do we import Prelude here?]

    -- | Platform architecture and OS.
    data ArchOS
       = ArchOS
          { ArchOS -> Arch
    archOS_arch :: Arch
          , ArchOS -> OS
    archOS_OS   :: OS
          }
       deriving (ReadPrec [ArchOS]
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    -- | Architectures
    --
    -- TODO: It might be nice to extend these constructors with information about
    -- what instruction set extensions an architecture might support.
    --
    data Arch
       = ArchUnknown
       | ArchX86
       | ArchX86_64
       | ArchPPC
       | ArchPPC_64 PPC_64ABI
       | ArchS390X
       | ArchARM ArmISA [ArmISAExt] ArmABI
       | ArchAArch64
       | ArchAlpha
       | ArchMipseb
       | ArchMipsel
       | ArchRISCV64
       | ArchJavaScript
       deriving (ReadPrec [Arch]
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    -- | ARM Instruction Set Architecture
    data ArmISA
       = ARMv5
       | ARMv6
       | ARMv7
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    -- | ARM extensions
    data ArmISAExt
       = VFPv2
       | VFPv3
       | VFPv3D16
       | NEON
       | IWMMX2
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    -- | ARM ABI
    data ArmABI
       = SOFT
       | SOFTFP
       | HARD
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    -- | PowerPC 64-bit ABI
    data PPC_64ABI
       = ELF_V1 -- ^ PowerPC64
       | ELF_V2 -- ^ PowerPC64 LE
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    -- | Operating systems.
    --
    -- Using OSUnknown to generate code should produce a sensible default, but no
    -- promises.
    data OS
       = OSUnknown
       | OSLinux
       | OSDarwin
       | OSSolaris2
       | OSMinGW32
       | OSFreeBSD
       | OSDragonFly
       | OSOpenBSD
       | OSNetBSD
       | OSKFreeBSD
       | OSHaiku
       | OSQNXNTO
       | OSAIX
       | OSHurd
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    -- Note [Platform Syntax]
    -- ~~~~~~~~~~~~~~~~~~~~~~
    --
    -- There is a very loose encoding of platforms shared by many tools we are
    -- encoding to here. GNU Config (http://git.savannah.gnu.org/cgit/config.git),
    -- and LLVM's http://llvm.org/doxygen/classllvm_1_1Triple.html are perhaps the
    -- most definitional parsers. The basic syntax is a list of '-'-separated
    -- components. The Unix 'uname' command syntax is related but briefer.
    --
    -- Those two parsers are quite forgiving, and even the 'config.sub'
    -- normalization is forgiving too. The "best" way to encode a platform is
    -- therefore somewhat a matter of taste.
    --
    -- The 'stringEncode*' functions here convert each part of GHC's structured
    -- notion of a platform into one dash-separated component.

    -- | See Note [Platform Syntax].
    stringEncodeArch :: Arch -> String
    stringEncodeArch :: Arch -> String
    stringEncodeArch = \case
      Arch
    ArchUnknown       -> String
    "unknown"
      Arch
    ArchX86           -> String
    "i386"
      Arch
    ArchX86_64        -> String
    "x86_64"
      Arch
    ArchPPC           -> String
    "powerpc"
      ArchPPC_64 PPC_64ABI
    ELF_V1 -> String
    "powerpc64"
      ArchPPC_64 PPC_64ABI
    ELF_V2 -> String
    "powerpc64le"
      Arch
    ArchS390X         -> String
    "s390x"
      ArchARM ArmISA
    ARMv5 [ArmISAExt]
    _ ArmABI
    _ -> String
    "armv5"
      ArchARM ArmISA
    ARMv6 [ArmISAExt]
    _ ArmABI
    _ -> String
    "armv6"
      ArchARM ArmISA
    ARMv7 [ArmISAExt]
    _ ArmABI
    _ -> String
    "armv7"
      Arch
    ArchAArch64       -> String
    "aarch64"
      Arch
    ArchAlpha         -> String
    "alpha"
      Arch
    ArchMipseb        -> String
    "mipseb"
      Arch
    ArchMipsel        -> String
    "mipsel"
      Arch
    ArchRISCV64       -> String
    "riscv64"
      Arch
    ArchJavaScript    -> String
    "js"

    -- | See Note [Platform Syntax].
    stringEncodeOS :: OS -> String
    stringEncodeOS :: OS -> String
    stringEncodeOS = \case
      OS
    OSUnknown   -> String
    "unknown"
      OS
    OSLinux     -> String
    "linux"
      OS
    OSDarwin    -> String
    "darwin"
      OS
    OSSolaris2  -> String
    "solaris2"
      OS
    OSMinGW32   -> String
    "mingw32"
      OS
    OSFreeBSD   -> String
    "freebsd"
      OS
    OSDragonFly -> String
    "dragonfly"
      OS
    OSOpenBSD   -> String
    "openbsd"
      OS
    OSNetBSD    -> String
    "netbsd"
      OS
    OSKFreeBSD  -> String
    "kfreebsdgnu"
      OS
    OSHaiku     -> String
    "haiku"
      OS
    OSQNXNTO    -> String
    "nto-qnx"
      OS
    OSAIX       -> String
    "aix"
      OS
    OSHurd      -> String
    "hurd"