572 lines
21 KiB
Haskell
572 lines
21 KiB
Haskell
{-# LANGUAGE CPP #-}
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--
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-- Copyright (C) 2004-5 Don Stewart - http://www.cse.unsw.edu.au/~dons
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--
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-- This library is free software; you can redistribute it and/or
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-- modify it under the terms of the GNU Lesser General Public
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-- License as published by the Free Software Foundation; either
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-- version 2.1 of the License, or (at your option) any later version.
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--
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-- This library is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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-- Lesser General Public License for more details.
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--
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-- You should have received a copy of the GNU Lesser General Public
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-- License along with this library; if not, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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-- USA
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--
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module System.Plugins.Env (
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env,
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withModEnv,
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withDepEnv,
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withPkgEnvs,
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withMerged,
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modifyModEnv,
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modifyDepEnv,
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modifyPkgEnv,
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modifyMerged,
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addModule,
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rmModule,
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addModules,
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isLoaded,
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loaded,
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addModuleDeps,
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getModuleDeps,
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rmModuleDeps,
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isMerged,
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lookupMerged,
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addMerge,
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addPkgConf,
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union,
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addStaticPkg,
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isStaticPkg,
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grabDefaultPkgConf,
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readPackageConf,
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lookupPkg
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) where
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#include "../../../config.h"
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import System.Plugins.LoadTypes (Module)
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import System.Plugins.Consts ( sysPkgSuffix )
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import Control.Monad ( liftM )
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import Data.IORef ( writeIORef, readIORef, newIORef, IORef() )
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import Data.Maybe ( isJust, isNothing, fromMaybe )
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import Data.List ( (\\), nub, )
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import System.IO.Unsafe ( unsafePerformIO )
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import System.Directory ( doesFileExist )
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#if defined(CYGWIN) || defined(__MINGW32__)
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import Prelude hiding ( catch, ioError )
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import System.IO.Error ( catch, ioError, isDoesNotExistError )
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#endif
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import Control.Concurrent.MVar ( MVar(), newMVar, withMVar )
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import Distribution.Package hiding (depends, packageName, PackageName(..)
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#if MIN_VERSION_ghc(7,10,0)
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, installedPackageId
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#endif
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)
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import Distribution.Text
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import Distribution.InstalledPackageInfo
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import Distribution.Simple.Compiler
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import Distribution.Simple.GHC
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import Distribution.Simple.PackageIndex
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import Distribution.Simple.Program
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import Distribution.Verbosity
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import qualified Data.Map as M
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import qualified Data.Set as S
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--
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-- and map Data.Map terms to FiniteMap terms
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--
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type FiniteMap k e = M.Map k e
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emptyFM :: FiniteMap key elt
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emptyFM = M.empty
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addToFM :: (Ord key) => FiniteMap key elt -> key -> elt -> FiniteMap key elt
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addToFM = \m k e -> M.insert k e m
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addWithFM :: (Ord key)
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=> (elt -> elt -> elt) -> FiniteMap key elt -> key -> elt -> FiniteMap key elt
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addWithFM = \comb m k e -> M.insertWith comb k e m
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delFromFM :: (Ord key) => FiniteMap key elt -> key -> FiniteMap key elt
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delFromFM = flip M.delete
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lookupFM :: (Ord key) => FiniteMap key elt -> key -> Maybe elt
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lookupFM = flip M.lookup
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--
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-- | We need to record what modules and packages we have loaded, so if
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-- we read a .hi file that wants to load something already loaded, we
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-- can safely ignore that request. We're in the IO monad anyway, so we
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-- can add some extra state of our own.
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--
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-- The state is a FiniteMap String (Module,Int) (a hash of
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-- package\/object names to Modules and how many times they've been
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-- loaded).
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--
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-- It also contains the package.conf information, so that if there is a
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-- package dependency we can find it correctly, even if it has a
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-- non-standard path or name, and if it isn't an official package (but
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-- rather one provided via -package-conf). This is stored as a FiniteMap
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-- PackageName PackageConfig. The problem then is whether a user's
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-- package.conf, that uses the same package name as an existing GHC
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-- package, should be allowed, or should shadow a library package? I
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-- don't know, but I'm inclined to have the GHC package shadow the
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-- user's package.
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--
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-- This idea is based on /Hampus Ram's dynamic loader/ dependency
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-- tracking system. He uses state to record dependency trees to allow
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-- clean unloading and other fun. This is quite cool. We're just using
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-- state to make sure we don't load the same package twice. Implementing
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-- the full dependency tree idea would be nice, though not fully
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-- necessary as we have the dependency information store in .hi files,
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-- unlike in hram's loader.
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--
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type ModEnv = FiniteMap String (Module,Int)
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type DepEnv = FiniteMap Module [Module]
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-- represents a package.conf file
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type PkgEnv = FiniteMap PackageName PackageConfig
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type StaticPkgEnv = S.Set PackageName
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-- record dependencies between (src,stub) -> merged modid
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type MergeEnv = FiniteMap (FilePath,FilePath) FilePath
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-- multiple package.conf's kept in separate namespaces
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type PkgEnvs = [PkgEnv]
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type Env = (MVar (),
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IORef ModEnv,
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IORef DepEnv,
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IORef PkgEnvs,
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IORef StaticPkgEnv,
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IORef MergeEnv)
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--
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-- our environment, contains a set of loaded objects, and a map of known
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-- packages and their informations. Initially all we know is the default
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-- package.conf information.
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--
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env = unsafePerformIO $ do
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mvar <- newMVar ()
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ref1 <- newIORef emptyFM -- loaded objects
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ref2 <- newIORef emptyFM
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p <- grabDefaultPkgConf
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ref3 <- newIORef p -- package.conf info
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ref4 <- newIORef (S.fromList ["base","Cabal","haskell-src", "containers",
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"arrays", "directory", "random", "process",
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"ghc", "ghc-prim"])
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ref5 <- newIORef emptyFM -- merged files
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return (mvar, ref1, ref2, ref3, ref4, ref5)
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{-# NOINLINE env #-}
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-- -----------------------------------------------------------
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--
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-- | apply 'f' to the loaded objects Env, apply 'f' to the package.conf
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-- FM /locks up the MVar/ so you can't recursively call a function
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-- inside a with any -Env function. Nice and threadsafe
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--
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withModEnv :: Env -> (ModEnv -> IO a) -> IO a
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withDepEnv :: Env -> (DepEnv -> IO a) -> IO a
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withPkgEnvs :: Env -> (PkgEnvs -> IO a) -> IO a
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withStaticPkgEnv :: Env -> (StaticPkgEnv -> IO a) -> IO a
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withMerged :: Env -> (MergeEnv -> IO a) -> IO a
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withModEnv (mvar,ref,_,_,_,_) f = withMVar mvar (\_ -> readIORef ref >>= f)
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withDepEnv (mvar,_,ref,_,_,_) f = withMVar mvar (\_ -> readIORef ref >>= f)
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withPkgEnvs (mvar,_,_,ref,_,_) f = withMVar mvar (\_ -> readIORef ref >>= f)
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withStaticPkgEnv (mvar,_,_,_,ref,_) f = withMVar mvar (\_ -> readIORef ref >>= f)
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withMerged (mvar,_,_,_,_,ref) f = withMVar mvar (\_ -> readIORef ref >>= f)
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-- -----------------------------------------------------------
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--
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-- write an object name
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-- write a new PackageConfig
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--
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modifyModEnv :: Env -> (ModEnv -> IO ModEnv) -> IO ()
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modifyDepEnv :: Env -> (DepEnv -> IO DepEnv) -> IO ()
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modifyPkgEnv :: Env -> (PkgEnvs -> IO PkgEnvs) -> IO ()
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modifyStaticPkgEnv :: Env -> (StaticPkgEnv -> IO StaticPkgEnv) -> IO ()
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modifyMerged :: Env -> (MergeEnv -> IO MergeEnv)-> IO ()
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modifyModEnv (mvar,ref,_,_,_,_) f = lockAndWrite mvar ref f
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modifyDepEnv (mvar,_,ref,_,_,_) f = lockAndWrite mvar ref f
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modifyPkgEnv (mvar,_,_,ref,_,_) f = lockAndWrite mvar ref f
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modifyStaticPkgEnv (mvar,_,_,_,ref,_) f = lockAndWrite mvar ref f
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modifyMerged (mvar,_,_,_,_,ref) f = lockAndWrite mvar ref f
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-- private
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lockAndWrite mvar ref f = withMVar mvar (\_->readIORef ref>>=f>>=writeIORef ref)
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-- -----------------------------------------------------------
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--
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-- | insert a loaded module name into the environment
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--
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addModule :: String -> Module -> IO ()
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addModule s m = modifyModEnv env $ \fm -> let c = maybe 0 snd (lookupFM fm s)
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in return $ addToFM fm s (m,c+1)
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--getModule :: String -> IO (Maybe Module)
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--getModule s = withModEnv env $ \fm -> return (lookupFM fm s)
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--
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-- | remove a module name from the environment. Returns True if the
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-- module was actually removed.
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--
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rmModule :: String -> IO Bool
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rmModule s = do modifyModEnv env $ \fm -> let c = maybe 1 snd (lookupFM fm s)
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fm' = delFromFM fm s
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in if c-1 <= 0
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then return fm'
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else return fm
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withModEnv env $ \fm -> return (isNothing (lookupFM fm s))
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--
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-- | insert a list of module names all in one go
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--
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addModules :: [(String,Module)] -> IO ()
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addModules ns = mapM_ (uncurry addModule) ns
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--
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-- | is a module\/package already loaded?
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--
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isLoaded :: String -> IO Bool
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isLoaded s = withModEnv env $ \fm -> return $ isJust (lookupFM fm s)
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--
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-- confusing! only for filter.
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--
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loaded :: String -> IO Bool
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loaded m = do t <- isLoaded m ; return (not t)
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-- -----------------------------------------------------------
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--
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-- module dependency stuff
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--
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--
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-- | Set the dependencies of a Module.
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--
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addModuleDeps :: Module -> [Module] -> IO ()
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addModuleDeps m deps = modifyDepEnv env $ \fm -> return $ addToFM fm m deps
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--
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-- | Get module dependencies. Nothing if none have been recored.
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--
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getModuleDeps :: Module -> IO [Module]
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getModuleDeps m = withDepEnv env $ \fm -> return $ fromMaybe [] (lookupFM fm m)
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--
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-- | Unrecord a module from the environment.
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--
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rmModuleDeps :: Module -> IO ()
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rmModuleDeps m = modifyDepEnv env $ \fm -> return $ delFromFM fm m
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-- -----------------------------------------------------------
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-- Package management stuff
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--
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-- | Insert a single package.conf (containing multiple configs) means:
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-- create a new FM. insert packages into FM. add FM to end of list of FM
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-- stored in the environment.
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--
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addPkgConf :: FilePath -> IO ()
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addPkgConf f = do
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ps <- readPackageConf f
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modifyPkgEnv env $ \ls -> return $ union ls ps
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--
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-- | add a new FM for the package.conf to the list of existing ones; if a package occurs multiple
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-- times, pick the one with the higher version number as the default (e.g., important for base in
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-- GHC 6.12)
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--
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union :: PkgEnvs -> [PackageConfig] -> PkgEnvs
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union ls ps' =
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let fm = emptyFM -- new FM for this package.conf
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in foldr addOnePkg fm ps' : ls
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where
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-- we add each package with and without it's version number and with the full installedPackageId
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addOnePkg p fm' = addToPkgEnvs (addToPkgEnvs (addToPkgEnvs fm' (display $ sourcePackageId p) p) (display $ installedPackageId p) p)
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(packageName p) p
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-- if no version number specified, pick the higher version
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addToPkgEnvs = addWithFM higherVersion
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higherVersion pkgconf1 pkgconf2
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| installedPackageId pkgconf1 >= installedPackageId pkgconf2 = pkgconf1
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| otherwise = pkgconf2
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--
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-- | generate a PkgEnv from the system package.conf
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-- The path to the default package.conf was determined by /configure/
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-- This imposes a constraint that you must build your plugins with the
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-- same ghc you use to build hs-plugins. This is reasonable, we feel.
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--
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grabDefaultPkgConf :: IO PkgEnvs
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grabDefaultPkgConf = do
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pc <- configureAllKnownPrograms silent defaultProgramConfiguration
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#if MIN_VERSION_Cabal(1,24,0)
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(compiler, _platform, _programConfiguration)
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<- configure silent Nothing Nothing pc
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pkgIndex <- getInstalledPackages silent compiler
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[GlobalPackageDB, UserPackageDB] pc
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#else
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pkgIndex <- getInstalledPackages silent [GlobalPackageDB, UserPackageDB] pc
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#endif
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return $ [] `union` allPackages pkgIndex
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--
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-- parse a source file, expanding any $libdir we see.
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--
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readPackageConf :: FilePath -> IO [PackageConfig]
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readPackageConf f = do
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pc <- configureAllKnownPrograms silent defaultProgramConfiguration
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#if MIN_VERSION_Cabal(1,24,0)
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(compiler, _platform, _programConfiguration)
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<- configure silent Nothing Nothing pc
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pkgIndex <- getInstalledPackages silent compiler [GlobalPackageDB, UserPackageDB, SpecificPackageDB f] pc
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#else
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pkgIndex <- getInstalledPackages silent [GlobalPackageDB, UserPackageDB, SpecificPackageDB f] pc
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#endif
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return $ allPackages pkgIndex
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-- -----------------------------------------------------------
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-- Static package management stuff. A static package is linked with the base
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-- application and we should therefore not link with any of the DLLs it requires.
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addStaticPkg :: PackageName -> IO ()
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addStaticPkg pkg = modifyStaticPkgEnv env $ \set -> return $ S.insert pkg set
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isStaticPkg :: PackageName -> IO Bool
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isStaticPkg pkg = withStaticPkgEnv env $ \set -> return $ S.member pkg set
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--
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-- Package path, given a package name, look it up in the environment and
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-- return the path to all the libraries needed to load this package.
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--
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-- What do we need to load? With the library_dirs as prefix paths:
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-- . anything in the hs_libraries fields, libdir expanded
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--
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-- . anything in the extra_libraries fields (i.e. cbits), expanded,
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--
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-- which includes system .so files.
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--
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-- . also load any dependencies now, because of that weird mtl
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-- library that lang depends upon, but which doesn't show up in the
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-- interfaces for some reason.
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--
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-- We return all the package paths that possibly exist, and the leave it
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-- up to loadObject not to load the same ones twice...
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--
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lookupPkg :: PackageName -> IO ([FilePath],[FilePath])
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lookupPkg pn = go [] pn
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where
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go :: [PackageName] -> PackageName -> IO ([FilePath],[FilePath])
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go seen p = do
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(ps, (f, g)) <- lookupPkg' p
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static <- isStaticPkg p
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(f', g') <- liftM unzip $ mapM (go (nub $ seen ++ ps)) (ps \\ seen)
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return $ (nub $ (concat f') ++ f, if static then [] else nub $ (concat g') ++ g)
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data LibrarySpec
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= DLL String -- -lLib
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| DLLPath FilePath -- -Lpath
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classifyLdInput :: FilePath -> IO (Maybe LibrarySpec)
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classifyLdInput ('-':'l':lib) = return (Just (DLL lib))
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classifyLdInput ('-':'L':path) = return (Just (DLLPath path))
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classifyLdInput _ = return Nothing
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-- TODO need to define a MAC\/DARWIN symbol
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#if defined(MACOSX)
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mkSOName root = "lib" ++ root ++ ".dylib"
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#elif defined(CYGWIN) || defined(__MINGW32__)
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-- Win32 DLLs have no .dll extension here, because addDLL tries
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-- both foo.dll and foo.drv
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mkSOName root = root
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#else
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mkSOName root = "lib" ++ root ++ ".so"
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#endif
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#if defined(MACOSX)
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mkDynPkgName root = mkSOName (root ++ "_dyn")
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#else
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mkDynPkgName root = mkSOName root
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#endif
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data HSLib = Static FilePath | Dynamic FilePath
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--
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-- return any stuff to load for this package, plus the list of packages
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-- this package depends on. which includes stuff we have to then load
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-- too.
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--
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lookupPkg' :: PackageName -> IO ([PackageName],([FilePath],[FilePath]))
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lookupPkg' p = withPkgEnvs env $ \fms -> go fms p
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where
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go [] _ = return ([],([],[]))
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go (fm:fms) q = case lookupFM fm q of
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Nothing -> go fms q -- look in other pkgs
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Just pkg -> do
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let hslibs = hsLibraries pkg
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extras' = extraLibraries pkg
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cbits = filter (\e -> reverse (take (length "_cbits") (reverse e)) == "_cbits") extras'
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extras = filter (flip notElem cbits) extras'
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ldopts = ldOptions pkg
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deppkgs = packageDeps pkg
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ldInput <- mapM classifyLdInput ldopts
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let ldOptsLibs = [ path | Just (DLL path) <- ldInput ]
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ldOptsPaths = [ path | Just (DLLPath path) <- ldInput ]
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dlls = map mkSOName (extras ++ ldOptsLibs)
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#if defined(CYGWIN) || defined(__MINGW32__)
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libdirs = fix_topdir (libraryDirs pkg) ++ ldOptsPaths
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#else
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libdirs = libraryDirs pkg ++ ldOptsPaths
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#endif
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-- If we're loading dynamic libs we need the cbits to appear before the
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-- real packages.
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libs <- mapM (findHSlib libdirs) (cbits ++ hslibs)
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#if defined(CYGWIN) || defined(__MINGW32__)
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windowsos <- catch (getEnv "OS")
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(\e -> if isDoesNotExistError e then return "Windows_98" else ioError e)
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windowsdir <-
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if windowsos == "Windows_9X" -- I don't know Windows 9X has OS system variable
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then return "C:/windows"
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else return "C:/winnt"
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sysroot <- catch (getEnv "SYSTEMROOT")
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(\e -> if isDoesNotExistError e then return windowsdir else ioError e) -- guess at a reasonable default
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let syslibdir = sysroot ++ (if windowsos == "Windows_9X" then "/SYSTEM" else "/SYSTEM32")
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libs' <- mapM (findDLL $ syslibdir : libdirs) dlls
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#else
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libs' <- mapM (findDLL libdirs) dlls
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#endif
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let slibs = [ lib | Right (Static lib) <- libs ]
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dlibs = [ lib | Right (Dynamic lib) <- libs ]
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return (deppkgs, (slibs,map (either id id) libs' ++ dlibs) )
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#if defined(CYGWIN) || defined(__MINGW32__)
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-- replace $topdir
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fix_topdir [] = []
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fix_topdir (x:xs) = replace_topdir x : fix_topdir xs
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replace_topdir [] = []
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replace_topdir ('$':xs)
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| take 6 xs == "topdir" = ghcLibraryPath ++ (drop 6 xs)
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| otherwise = '$' : replace_topdir xs
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replace_topdir (x:xs) = x : replace_topdir xs
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#endif
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-- a list elimination form for the Maybe type
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--filterRight :: [Either left right] -> [right]
|
|
--filterRight [] = []
|
|
--filterRight (Right x:xs) = x:filterRight xs
|
|
--filterRight (Left _:xs) = filterRight xs
|
|
|
|
--
|
|
-- Check that a path to a library actually reaches a library
|
|
findHSlib' :: [FilePath] -> String -> IO (Maybe FilePath)
|
|
findHSlib' [] _ = return Nothing
|
|
findHSlib' (dir:dirs) lib = do
|
|
let l = dir </> lib
|
|
b <- doesFileExist l
|
|
if b then return $ Just l -- found it!
|
|
else findHSlib' dirs lib
|
|
|
|
findHSslib dirs lib = findHSlib' dirs $ lib ++ sysPkgSuffix
|
|
findHSdlib dirs lib = findHSlib' dirs $ mkDynPkgName lib
|
|
|
|
-- Problem: sysPkgSuffix is ".o", but extra libraries could be
|
|
-- ".so"
|
|
-- Solution: first look for static library, if we don't find it
|
|
-- look for a dynamic version.
|
|
findHSlib :: [FilePath] -> String -> IO (Either String HSLib)
|
|
findHSlib dirs lib = do
|
|
static <- findHSslib dirs lib
|
|
case static of
|
|
Just file -> return $ Right $ Static file
|
|
Nothing -> do
|
|
dynamic <- findHSdlib dirs lib
|
|
case dynamic of
|
|
Just file -> return $ Right $ Dynamic file
|
|
Nothing -> return $ Left lib
|
|
|
|
findDLL :: [FilePath] -> String -> IO (Either String FilePath)
|
|
findDLL [] lib = return (Left lib)
|
|
findDLL (dir:dirs) lib = do
|
|
let l = dir </> lib
|
|
b <- doesFileExist l
|
|
if b then return $ Right l
|
|
else findDLL dirs lib
|
|
|
|
------------------------------------------------------------------------
|
|
-- do we have a Module name for this merge?
|
|
--
|
|
isMerged :: FilePath -> FilePath -> IO Bool
|
|
isMerged a b = withMerged env $ \fm -> return $ isJust (lookupFM fm (a,b))
|
|
|
|
lookupMerged :: FilePath -> FilePath -> IO (Maybe FilePath)
|
|
lookupMerged a b = withMerged env $ \fm -> return $ lookupFM fm (a,b)
|
|
|
|
--
|
|
-- insert a new merge pair into env
|
|
--
|
|
addMerge :: FilePath -> FilePath -> FilePath -> IO ()
|
|
addMerge a b z = modifyMerged env $ \fm -> return $ addToFM fm (a,b) z
|
|
|
|
------------------------------------------------------------------------
|
|
-- break a module cycle
|
|
-- private:
|
|
--
|
|
(</>) :: FilePath -> FilePath -> FilePath
|
|
[] </> b = b
|
|
a </> b = a ++ "/" ++ b
|
|
|
|
|
|
------------------------------------------------------------------------
|
|
|
|
--
|
|
-- We export an abstract interface to package conf`s because we have
|
|
-- to handle either traditional or Cabal style package conf`s.
|
|
--
|
|
|
|
|
|
|
|
packageName :: PackageConfig -> PackageName
|
|
packageDeps :: PackageConfig -> [PackageName]
|
|
-- updImportDirs :: ([FilePath] -> [FilePath]) -> PackageConfig -> PackageConfig
|
|
-- updLibraryDirs :: ([FilePath] -> [FilePath]) -> PackageConfig -> PackageConfig
|
|
|
|
|
|
type PackageName = String
|
|
|
|
type PackageConfig = InstalledPackageInfo
|
|
|
|
packageName = display . pkgName . sourcePackageId
|
|
-- packageName_ = pkgName . sourcePackageId
|
|
packageDeps = (map display) . depends
|
|
|
|
{-
|
|
updImportDirs f pk@(InstalledPackageInfo { importDirs = idirs }) =
|
|
pk { importDirs = f idirs }
|
|
updLibraryDirs f pk@(InstalledPackageInfo { libraryDirs = ldirs }) =
|
|
pk { libraryDirs = f ldirs }
|
|
-}
|