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|
{-# LANGUAGE CPP #-}
-- | Llvm code generator configuration
module GHC.CmmToLlvm.Config
( LlvmCgConfig(..)
, LlvmConfig(..)
, LlvmTarget(..)
, initLlvmConfig
-- * LLVM version
, LlvmVersion(..)
, supportedLlvmVersionLowerBound
, supportedLlvmVersionUpperBound
, parseLlvmVersion
, llvmVersionSupported
, llvmVersionStr
, llvmVersionList
)
where
#include "ghc-llvm-version.h"
import GHC.Prelude
import GHC.Platform
import GHC.Utils.Outputable
import GHC.Settings.Utils
import GHC.Utils.Panic
import Data.Char (isDigit)
import Data.List (intercalate)
import qualified Data.List.NonEmpty as NE
import System.FilePath
data LlvmCgConfig = LlvmCgConfig
{ llvmCgPlatform :: !Platform -- ^ Target platform
, llvmCgContext :: !SDocContext -- ^ Context for LLVM code generation
, llvmCgFillUndefWithGarbage :: !Bool -- ^ Fill undefined literals with garbage values
, llvmCgSplitSection :: !Bool -- ^ Split sections
, llvmCgBmiVersion :: Maybe BmiVersion -- ^ (x86) BMI instructions
, llvmCgLlvmVersion :: Maybe LlvmVersion -- ^ version of Llvm we're using
, llvmCgDoWarn :: !Bool -- ^ True ==> warn unsupported Llvm version
, llvmCgLlvmTarget :: !String -- ^ target triple passed to LLVM
, llvmCgLlvmConfig :: !LlvmConfig -- ^ Supported LLVM configurations.
-- see Note [LLVM configuration]
}
data LlvmTarget = LlvmTarget
{ lDataLayout :: String
, lCPU :: String
, lAttributes :: [String]
}
-- Note [LLVM configuration]
-- ~~~~~~~~~~~~~~~~~~~~~~~~~
-- The `llvm-targets` and `llvm-passes` files are shipped with GHC and contain
-- information needed by the LLVM backend to invoke `llc` and `opt`.
-- Specifically:
--
-- * llvm-targets maps autoconf host triples to the corresponding LLVM
-- `data-layout` declarations. This information is extracted from clang using
-- the script in utils/llvm-targets/gen-data-layout.sh and should be updated
-- whenever we target a new version of LLVM.
--
-- * llvm-passes maps GHC optimization levels to sets of LLVM optimization
-- flags that GHC should pass to `opt`.
--
-- This information is contained in files rather the GHC source to allow users
-- to add new targets to GHC without having to recompile the compiler.
--
initLlvmConfig :: FilePath -> IO LlvmConfig
initLlvmConfig top_dir
= do
targets <- readAndParse "llvm-targets"
passes <- readAndParse "llvm-passes"
return $ LlvmConfig
{ llvmTargets = fmap mkLlvmTarget <$> targets
, llvmPasses = passes
}
where
readAndParse :: Read a => String -> IO a
readAndParse name = do
let f = top_dir </> name
llvmConfigStr <- readFile f
case maybeReadFuzzy llvmConfigStr of
Just s -> return s
Nothing -> pgmError ("Can't parse LLVM config file: " ++ show f)
mkLlvmTarget :: (String, String, String) -> LlvmTarget
mkLlvmTarget (dl, cpu, attrs) = LlvmTarget dl cpu (words attrs)
data LlvmConfig = LlvmConfig
{ llvmTargets :: [(String, LlvmTarget)]
, llvmPasses :: [(Int, String)]
}
---------------------------------------------------------
-- LLVM version
---------------------------------------------------------
newtype LlvmVersion = LlvmVersion { llvmVersionNE :: NE.NonEmpty Int }
deriving (Eq, Ord)
parseLlvmVersion :: String -> Maybe LlvmVersion
parseLlvmVersion =
fmap LlvmVersion . NE.nonEmpty . go [] . dropWhile (not . isDigit)
where
go vs s
| null ver_str
= reverse vs
| '.' : rest' <- rest
= go (read ver_str : vs) rest'
| otherwise
= reverse (read ver_str : vs)
where
(ver_str, rest) = span isDigit s
-- | The (inclusive) lower bound on the LLVM Version that is currently supported.
supportedLlvmVersionLowerBound :: LlvmVersion
supportedLlvmVersionLowerBound = LlvmVersion (sUPPORTED_LLVM_VERSION_MIN NE.:| [])
-- | The (not-inclusive) upper bound bound on the LLVM Version that is currently supported.
supportedLlvmVersionUpperBound :: LlvmVersion
supportedLlvmVersionUpperBound = LlvmVersion (sUPPORTED_LLVM_VERSION_MAX NE.:| [])
llvmVersionSupported :: LlvmVersion -> Bool
llvmVersionSupported v =
v >= supportedLlvmVersionLowerBound && v < supportedLlvmVersionUpperBound
llvmVersionStr :: LlvmVersion -> String
llvmVersionStr = intercalate "." . map show . llvmVersionList
llvmVersionList :: LlvmVersion -> [Int]
llvmVersionList = NE.toList . llvmVersionNE
|
