{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE ScopedTypeVariables #-}

module GHC.Settings.IO
 ( SettingsError (..)
 , initSettings
 ) where

import GHC.Prelude

import GHC.Settings.Utils

import GHC.Settings.Config
import GHC.Utils.CliOption
import GHC.Utils.Fingerprint
import GHC.Platform
import GHC.Utils.Panic
import GHC.ResponseFile
import GHC.Settings
import GHC.SysTools.BaseDir

import Data.Char
import Control.Monad.Trans.Except
import Control.Monad.IO.Class
import qualified Data.Map as Map
import System.FilePath
import System.Directory

data SettingsError
  = SettingsError_MissingData String
  | SettingsError_BadData String

initSettings
  :: forall m
  .  MonadIO m
  => String -- ^ TopDir path
  -> ExceptT SettingsError m Settings
initSettings :: forall (m :: * -> *).
MonadIO m =>
String -> ExceptT SettingsError m Settings
initSettings String
top_dir = do
  let installed :: FilePath -> FilePath
      installed :: String -> String
installed String
file = String
top_dir String -> String -> String
</> String
file
      libexec :: FilePath -> FilePath
      libexec :: String -> String
libexec String
file = String
top_dir String -> String -> String
</> String
".." String -> String -> String
</> String
"bin" String -> String -> String
</> String
file
      settingsFile :: String
settingsFile = String -> String
installed String
"settings"

      readFileSafe :: FilePath -> ExceptT SettingsError m String
      readFileSafe :: String -> ExceptT SettingsError m String
readFileSafe String
path = IO Bool -> ExceptT SettingsError m Bool
forall a. IO a -> ExceptT SettingsError m a
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (String -> IO Bool
doesFileExist String
path) ExceptT SettingsError m Bool
-> (Bool -> ExceptT SettingsError m String)
-> ExceptT SettingsError m String
forall a b.
ExceptT SettingsError m a
-> (a -> ExceptT SettingsError m b) -> ExceptT SettingsError m b
forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= \case
        Bool
True -> IO String -> ExceptT SettingsError m String
forall a. IO a -> ExceptT SettingsError m a
forall (m :: * -> *) a. MonadIO m => IO a -> m a
liftIO (IO String -> ExceptT SettingsError m String)
-> IO String -> ExceptT SettingsError m String
forall a b. (a -> b) -> a -> b
$ String -> IO String
readFile String
path
        Bool
False -> SettingsError -> ExceptT SettingsError m String
forall (m :: * -> *) e a. Monad m => e -> ExceptT e m a
throwE (SettingsError -> ExceptT SettingsError m String)
-> SettingsError -> ExceptT SettingsError m String
forall a b. (a -> b) -> a -> b
$ String -> SettingsError
SettingsError_MissingData (String -> SettingsError) -> String -> SettingsError
forall a b. (a -> b) -> a -> b
$ String
"Missing file: " String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
path

  settingsStr <- String -> ExceptT SettingsError m String
readFileSafe String
settingsFile
  settingsList <- case maybeReadFuzzy settingsStr of
    Just [(String, String)]
s -> [(String, String)] -> ExceptT SettingsError m [(String, String)]
forall a. a -> ExceptT SettingsError m a
forall (f :: * -> *) a. Applicative f => a -> f a
pure [(String, String)]
s
    Maybe [(String, String)]
Nothing -> SettingsError -> ExceptT SettingsError m [(String, String)]
forall (m :: * -> *) e a. Monad m => e -> ExceptT e m a
throwE (SettingsError -> ExceptT SettingsError m [(String, String)])
-> SettingsError -> ExceptT SettingsError m [(String, String)]
forall a b. (a -> b) -> a -> b
$ String -> SettingsError
SettingsError_BadData (String -> SettingsError) -> String -> SettingsError
forall a b. (a -> b) -> a -> b
$
      String
"Can't parse " String -> String -> String
forall a. [a] -> [a] -> [a]
++ String -> String
forall a. Show a => a -> String
show String
settingsFile
  let mySettings = [(String, String)] -> Map String String
forall k a. Ord k => [(k, a)] -> Map k a
Map.fromList [(String, String)]
settingsList
      getBooleanSetting :: String -> ExceptT SettingsError m Bool
      getBooleanSetting String
key = (String -> ExceptT SettingsError m Bool)
-> (Bool -> ExceptT SettingsError m Bool)
-> Either String Bool
-> ExceptT SettingsError m Bool
forall a c b. (a -> c) -> (b -> c) -> Either a b -> c
either String -> ExceptT SettingsError m Bool
forall a. HasCallStack => String -> a
pgmError Bool -> ExceptT SettingsError m Bool
forall a. a -> ExceptT SettingsError m a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Either String Bool -> ExceptT SettingsError m Bool)
-> Either String Bool -> ExceptT SettingsError m Bool
forall a b. (a -> b) -> a -> b
$
        String -> Map String String -> String -> Either String Bool
getRawBooleanSetting String
settingsFile Map String String
mySettings String
key

  -- On Windows, by mingw is often distributed with GHC,
  -- so we look in TopDir/../mingw/bin,
  -- as well as TopDir/../../mingw/bin for hadrian.
  -- But we might be disabled, in which we we don't do that.
  useInplaceMinGW <- getBooleanSetting "Use inplace MinGW toolchain"

  -- see Note [topdir: How GHC finds its files]
  -- NB: top_dir is assumed to be in standard Unix
  -- format, '/' separated
  mtool_dir <- liftIO $ findToolDir useInplaceMinGW top_dir
        -- see Note [tooldir: How GHC finds mingw on Windows]

  -- See Note [Settings file] for a little more about this file. We're
  -- just partially applying those functions and throwing 'Left's; they're
  -- written in a very portable style to keep ghc-boot light.
  let getSetting String
key = (String -> ExceptT SettingsError m String)
-> (String -> ExceptT SettingsError m String)
-> Either String String
-> ExceptT SettingsError m String
forall a c b. (a -> c) -> (b -> c) -> Either a b -> c
either String -> ExceptT SettingsError m String
forall a. HasCallStack => String -> a
pgmError String -> ExceptT SettingsError m String
forall a. a -> ExceptT SettingsError m a
forall (f :: * -> *) a. Applicative f => a -> f a
pure (Either String String -> ExceptT SettingsError m String)
-> Either String String -> ExceptT SettingsError m String
forall a b. (a -> b) -> a -> b
$
        -- Escape the 'top_dir', to make sure we don't accidentally introduce an
        -- unescaped space
        String
-> String -> Map String String -> String -> Either String String
getRawFilePathSetting (String -> String
escapeArg String
top_dir) String
settingsFile Map String String
mySettings String
key
      getToolSetting :: String -> ExceptT SettingsError m String
        -- Escape the 'mtool_dir', to make sure we don't accidentally introduce
        -- an unescaped space
      getToolSetting String
key = Bool -> Maybe String -> String -> String
expandToolDir Bool
useInplaceMinGW ((String -> String) -> Maybe String -> Maybe String
forall a b. (a -> b) -> Maybe a -> Maybe b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap String -> String
escapeArg Maybe String
mtool_dir) (String -> String)
-> ExceptT SettingsError m String -> ExceptT SettingsError m String
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> String -> ExceptT SettingsError m String
getSetting String
key
  targetPlatformString <- getSetting "target platform string"
  cc_prog <- getToolSetting "C compiler command"
  cxx_prog <- getToolSetting "C++ compiler command"
  cc_args_str <- getToolSetting "C compiler flags"
  cxx_args_str <- getToolSetting "C++ compiler flags"
  gccSupportsNoPie <- getBooleanSetting "C compiler supports -no-pie"
  cmmCppSupportsG0 <- getBooleanSetting "C-- CPP supports -g0"
  cpp_prog <- getToolSetting "CPP command"
  cpp_args_str <- getToolSetting "CPP flags"
  hs_cpp_prog <- getToolSetting "Haskell CPP command"
  hs_cpp_args_str <- getToolSetting "Haskell CPP flags"
  js_cpp_prog <- getToolSetting "JavaScript CPP command"
  js_cpp_args_str <- getToolSetting "JavaScript CPP flags"
  cmmCpp_prog <- getToolSetting "C-- CPP command"
  cmmCpp_args_str <- getToolSetting "C-- CPP flags"

  platform <- either pgmError pure $ getTargetPlatform settingsFile mySettings

  let unreg_cc_args = if Platform -> Bool
platformUnregisterised Platform
platform
                      then [String
"-DNO_REGS", String
"-DUSE_MINIINTERPRETER"]
                      else []
      cpp_args    = (String -> Option) -> [String] -> [Option]
forall a b. (a -> b) -> [a] -> [b]
map String -> Option
Option (String -> [String]
unescapeArgs String
cpp_args_str)
      hs_cpp_args = (String -> Option) -> [String] -> [Option]
forall a b. (a -> b) -> [a] -> [b]
map String -> Option
Option (String -> [String]
unescapeArgs String
hs_cpp_args_str)
      js_cpp_args = (String -> Option) -> [String] -> [Option]
forall a b. (a -> b) -> [a] -> [b]
map String -> Option
Option (String -> [String]
unescapeArgs String
js_cpp_args_str)
      cmmCpp_args = (String -> Option) -> [String] -> [Option]
forall a b. (a -> b) -> [a] -> [b]
map String -> Option
Option (String -> [String]
unescapeArgs String
cmmCpp_args_str)
      cc_args  = String -> [String]
unescapeArgs String
cc_args_str [String] -> [String] -> [String]
forall a. [a] -> [a] -> [a]
++ [String]
unreg_cc_args
      cxx_args = String -> [String]
unescapeArgs String
cxx_args_str

      -- The extra flags we need to pass gcc when we invoke it to compile .hc code.
      --
      -- -fwrapv is needed for gcc to emit well-behaved code in the presence of
      -- integer wrap around (#952).
      extraGccViaCFlags = if Platform -> Bool
platformUnregisterised Platform
platform
                            -- configure guarantees cc support these flags
                            then [String
"-fwrapv", String
"-fno-builtin"]
                            else []

  ldSupportsCompactUnwind <- getBooleanSetting "ld supports compact unwind"
  ldSupportsFilelist      <- getBooleanSetting "ld supports filelist"
  ldSupportsSingleModule  <- getBooleanSetting "ld supports single module"
  mergeObjsSupportsResponseFiles <- getBooleanSetting "Merge objects supports response files"
  ldIsGnuLd               <- getBooleanSetting "ld is GNU ld"
  arSupportsDashL         <- getBooleanSetting "ar supports -L"


  -- The package database is either a relative path to the location of the settings file
  -- OR an absolute path.
  -- In case the path is absolute then top_dir </> abs_path == abs_path
  --         the path is relative then top_dir </> rel_path == top_dir </> rel_path
  globalpkgdb_path <- installed <$> getSetting "Relative Global Package DB"

  let ghc_usage_msg_path  = String -> String
installed String
"ghc-usage.txt"
      ghci_usage_msg_path = String -> String
installed String
"ghci-usage.txt"

  -- For all systems, unlit, split, mangle are GHC utilities
  -- architecture-specific stuff is done when building Config.hs
  unlit_path <- getToolSetting "unlit command"

  windres_path <- getToolSetting "windres command"
  ar_path <- getToolSetting "ar command"
  otool_path <- getToolSetting "otool command"
  install_name_tool_path <- getToolSetting "install_name_tool command"
  ranlib_path <- getToolSetting "ranlib command"

  -- HACK, see setPgmP below. We keep 'words' here to remember to fix
  -- Config.hs one day.


  -- Other things being equal, as and ld are simply gcc
  cc_link_args_str <- getToolSetting "C compiler link flags"
  let   as_prog  = String
cc_prog
        as_args  = (String -> Option) -> [String] -> [Option]
forall a b. (a -> b) -> [a] -> [b]
map String -> Option
Option [String]
cc_args
        ld_prog  = String
cc_prog
        ld_args  = (String -> Option) -> [String] -> [Option]
forall a b. (a -> b) -> [a] -> [b]
map String -> Option
Option ([String]
cc_args [String] -> [String] -> [String]
forall a. [a] -> [a] -> [a]
++ String -> [String]
unescapeArgs String
cc_link_args_str)
  ld_r_prog <- getToolSetting "Merge objects command"
  ld_r_args <- getToolSetting "Merge objects flags"
  let ld_r
        | String -> Bool
forall a. [a] -> Bool
forall (t :: * -> *) a. Foldable t => t a -> Bool
null String
ld_r_prog = Maybe (String, [Option])
forall a. Maybe a
Nothing
        | Bool
otherwise      = (String, [Option]) -> Maybe (String, [Option])
forall a. a -> Maybe a
Just (String
ld_r_prog, (String -> Option) -> [String] -> [Option]
forall a b. (a -> b) -> [a] -> [b]
map String -> Option
Option ([String] -> [Option]) -> [String] -> [Option]
forall a b. (a -> b) -> a -> b
$ String -> [String]
unescapeArgs String
ld_r_args)

  llvmTarget <- getSetting "LLVM target"

  -- We just assume on command line
  lc_prog <- getSetting "LLVM llc command"
  lo_prog <- getSetting "LLVM opt command"
  las_prog <- getSetting "LLVM llvm-as command"

  let iserv_prog = String -> String
libexec String
"ghc-iserv"

  ghcWithInterpreter <- getBooleanSetting "Use interpreter"
  useLibFFI <- getBooleanSetting "Use LibFFI"

  return $ Settings
    { sGhcNameVersion = GhcNameVersion
      { ghcNameVersion_programName = "ghc"
      , ghcNameVersion_projectVersion = cProjectVersion
      }

    , sFileSettings = FileSettings
      { fileSettings_ghcUsagePath   = ghc_usage_msg_path
      , fileSettings_ghciUsagePath  = ghci_usage_msg_path
      , fileSettings_toolDir        = mtool_dir
      , fileSettings_topDir         = top_dir
      , fileSettings_globalPackageDatabase = globalpkgdb_path
      }

    , sToolSettings = ToolSettings
      { toolSettings_ldSupportsCompactUnwind = ldSupportsCompactUnwind
      , toolSettings_ldSupportsFilelist      = ldSupportsFilelist
      , toolSettings_ldSupportsSingleModule  = ldSupportsSingleModule
      , toolSettings_mergeObjsSupportsResponseFiles = mergeObjsSupportsResponseFiles
      , toolSettings_ldIsGnuLd               = ldIsGnuLd
      , toolSettings_ccSupportsNoPie         = gccSupportsNoPie
      , toolSettings_useInplaceMinGW         = useInplaceMinGW
      , toolSettings_arSupportsDashL         = arSupportsDashL
      , toolSettings_cmmCppSupportsG0        = cmmCppSupportsG0

      , toolSettings_pgm_L   = unlit_path
      , toolSettings_pgm_P   = (hs_cpp_prog, hs_cpp_args)
      , toolSettings_pgm_JSP = (js_cpp_prog, js_cpp_args)
      , toolSettings_pgm_CmmP = (cmmCpp_prog, cmmCpp_args)
      , toolSettings_pgm_F   = ""
      , toolSettings_pgm_c   = cc_prog
      , toolSettings_pgm_cxx = cxx_prog
      , toolSettings_pgm_cpp = (cpp_prog, cpp_args)
      , toolSettings_pgm_a   = (as_prog, as_args)
      , toolSettings_pgm_l   = (ld_prog, ld_args)
      , toolSettings_pgm_lm  = ld_r
      , toolSettings_pgm_windres = windres_path
      , toolSettings_pgm_ar = ar_path
      , toolSettings_pgm_otool = otool_path
      , toolSettings_pgm_install_name_tool = install_name_tool_path
      , toolSettings_pgm_ranlib = ranlib_path
      , toolSettings_pgm_lo  = (lo_prog,[])
      , toolSettings_pgm_lc  = (lc_prog,[])
      , toolSettings_pgm_las = (las_prog, [])
      , toolSettings_pgm_i   = iserv_prog
      , toolSettings_opt_L       = []
      , toolSettings_opt_P       = []
      , toolSettings_opt_JSP     = []
      , toolSettings_opt_CmmP    = []
      , toolSettings_opt_P_fingerprint   = fingerprint0
      , toolSettings_opt_JSP_fingerprint = fingerprint0
      , toolSettings_opt_CmmP_fingerprint = fingerprint0
      , toolSettings_opt_F       = []
      , toolSettings_opt_c       = cc_args
      , toolSettings_opt_cxx     = cxx_args
      , toolSettings_opt_a       = []
      , toolSettings_opt_l       = []
      , toolSettings_opt_lm      = []
      , toolSettings_opt_windres = []
      , toolSettings_opt_lo      = []
      , toolSettings_opt_lc      = []
      , toolSettings_opt_las     = []
      , toolSettings_opt_i       = []

      , toolSettings_extraGccViaCFlags = extraGccViaCFlags
      }

    , sTargetPlatform = platform
    , sPlatformMisc = PlatformMisc
      { platformMisc_targetPlatformString = targetPlatformString
      , platformMisc_ghcWithInterpreter = ghcWithInterpreter
      , platformMisc_libFFI = useLibFFI
      , platformMisc_llvmTarget = llvmTarget
      }

    , sRawSettings    = settingsList
    }

getTargetPlatform
  :: FilePath     -- ^ Settings filepath (for error messages)
  -> RawSettings  -- ^ Raw settings file contents
  -> Either String Platform
getTargetPlatform :: String -> Map String String -> Either String Platform
getTargetPlatform String
settingsFile Map String String
settings = do
  let
    getBooleanSetting :: String -> Either String Bool
getBooleanSetting = String -> Map String String -> String -> Either String Bool
getRawBooleanSetting String
settingsFile Map String String
settings
    readSetting :: (Show a, Read a) => String -> Either String a
    readSetting :: forall a. (Show a, Read a) => String -> Either String a
readSetting = String -> Map String String -> String -> Either String a
forall a.
(Show a, Read a) =>
String -> Map String String -> String -> Either String a
readRawSetting String
settingsFile Map String String
settings

  targetArchOS <- String -> Map String String -> Either String ArchOS
getTargetArchOS String
settingsFile Map String String
settings
  targetWordSize <- readSetting "target word size"
  targetWordBigEndian <- getBooleanSetting "target word big endian"
  targetLeadingUnderscore <- getBooleanSetting "Leading underscore"
  targetUnregisterised <- getBooleanSetting "Unregisterised"
  targetHasGnuNonexecStack <- getBooleanSetting "target has GNU nonexec stack"
  targetHasIdentDirective <- getBooleanSetting "target has .ident directive"
  targetHasSubsectionsViaSymbols <- getBooleanSetting "target has subsections via symbols"
  targetHasLibm <- getBooleanSetting "target has libm"
  crossCompiling <- getBooleanSetting "cross compiling"
  tablesNextToCode <- getBooleanSetting "Tables next to code"

  pure $ Platform
    { platformArchOS    = targetArchOS
    , platformWordSize  = targetWordSize
    , platformByteOrder = if targetWordBigEndian then BigEndian else LittleEndian
    , platformUnregisterised = targetUnregisterised
    , platformHasGnuNonexecStack = targetHasGnuNonexecStack
    , platformHasIdentDirective = targetHasIdentDirective
    , platformHasSubsectionsViaSymbols = targetHasSubsectionsViaSymbols
    , platformIsCrossCompiling = crossCompiling
    , platformLeadingUnderscore = targetLeadingUnderscore
    , platformTablesNextToCode  = tablesNextToCode
    , platformHasLibm = targetHasLibm
    , platform_constants = Nothing -- will be filled later when loading (or building) the RTS unit
    }

-- ----------------------------------------------------------------------------
-- Escape Args helpers
-- ----------------------------------------------------------------------------

-- | Just like 'GHC.ResponseFile.escapeArg', but it is not exposed from base.
escapeArg :: String -> String
escapeArg :: String -> String
escapeArg = String -> String
forall a. [a] -> [a]
reverse (String -> String) -> (String -> String) -> String -> String
forall b c a. (b -> c) -> (a -> b) -> a -> c
. (String -> Char -> String) -> String -> String -> String
forall b a. (b -> a -> b) -> b -> [a] -> b
forall (t :: * -> *) b a.
Foldable t =>
(b -> a -> b) -> b -> t a -> b
foldl' String -> Char -> String
escape []

escape :: String -> Char -> String
escape :: String -> Char -> String
escape String
cs Char
c
  |    Char -> Bool
isSpace Char
c
    Bool -> Bool -> Bool
|| Char
'\\' Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
c
    Bool -> Bool -> Bool
|| Char
'\'' Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
c
    Bool -> Bool -> Bool
|| Char
'"'  Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
== Char
c = Char
cChar -> String -> String
forall a. a -> [a] -> [a]
:Char
'\\'Char -> String -> String
forall a. a -> [a] -> [a]
:String
cs -- n.b., our caller must reverse the result
  | Bool
otherwise    = Char
cChar -> String -> String
forall a. a -> [a] -> [a]
:String
cs