rts-loader (empty) → 0.0.0.0
raw patch · 10 files changed
+1653/−0 lines, 10 filesdep +Cabaldep +basedep +directorybuild-type:Customsetup-changed
Dependencies added: Cabal, base, directory, filepath, process, rts-loader, unix, zenc
Files
- ChangeLog +7/−0
- GHC/Way.hs +96/−0
- LICENSE +674/−0
- LICENSE.GHC +31/−0
- README.md +66/−0
- Setup.hs +138/−0
- System/Loader/RTS.hs +314/−0
- rts-loader.c +238/−0
- rts-loader.cabal +61/−0
- src/Example.hs +28/−0
+ ChangeLog view
@@ -0,0 +1,7 @@+2016-06-24 Daniel Gröber <dxld@darkboxed.org>++ * Release version 0.0.0.0++2016-06-23 Daniel Gröber <dxld@darkboxed.org>++ * Initial release
+ GHC/Way.hs view
@@ -0,0 +1,96 @@+-- |+-- Module : GHC.Way+-- Copyright : (c) The University of Glasgow 2005+-- Copyright (C) 2016 Daniel Gröber+-- License : BSD3+-- Stability : unknown, ask the GHC guys I guess ;)+-- Portability : portable+--+-- Stolen from GHC's 'DynFlags' module.+--++module GHC.Way where++import Data.List++-- The Glasgow Haskell Compiler License++-- Copyright 2002, The University Court of the University of Glasgow.+-- All rights reserved.+--+-- Redistribution and use in source and binary forms, with or without+-- modification, are permitted provided that the following conditions are met:+--+-- - Redistributions of source code must retain the above copyright notice,+-- this list of conditions and the following disclaimer.+--+-- - Redistributions in binary form must reproduce the above copyright notice,+-- this list of conditions and the following disclaimer in the documentation+-- and/or other materials provided with the distribution.+--+-- - Neither name of the University nor the names of its contributors may be+-- used to endorse or promote products derived from this software without+-- specific prior written permission.+--+-- THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY COURT OF THE UNIVERSITY OF+-- GLASGOW AND THE CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,+-- INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND+-- FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE+-- UNIVERSITY COURT OF THE UNIVERSITY OF GLASGOW OR THE CONTRIBUTORS BE LIABLE+-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL+-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR+-- SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER+-- CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT+-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY+-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH+-- DAMAGE.++-- | GHC library way, see <https://ghc.haskell.org/trac/ghc/wiki/Commentary/Rts/CompilerWays GHC Wiki/Commentary/Rts/CompilerWays>+data Way+ = WayCustom String -- for GHC API clients building custom variants+ | WayThreaded+ | WayDebug+ | WayProf+ | WayEventLog+ | WayDyn+ deriving (Eq, Ord, Show)++allowed_way_combination :: [Way] -> Bool+allowed_way_combination way = and [ x `allowedWith` y+ | x <- way, y <- way, x < y ]+ where+ -- Note ordering in these tests: the left argument is+ -- <= the right argument, according to the Ord instance+ -- on Way above.++ -- dyn is allowed with everything+ _ `allowedWith` WayDyn = True+ WayDyn `allowedWith` _ = True++ -- debug is allowed with everything+ _ `allowedWith` WayDebug = True+ WayDebug `allowedWith` _ = True++ (WayCustom {}) `allowedWith` _ = True+ WayThreaded `allowedWith` WayProf = True+ WayThreaded `allowedWith` WayEventLog = True+ _ `allowedWith` _ = False++mkBuildTag :: [Way] -> String+mkBuildTag ways = concat (intersperse "_" (map wayTag ways))++wayTag :: Way -> String+wayTag (WayCustom xs) = xs+wayTag WayThreaded = "thr"+wayTag WayDebug = "debug"+wayTag WayDyn = "dyn"+wayTag WayProf = "p"+wayTag WayEventLog = "l"++wayRTSOnly :: Way -> Bool+wayRTSOnly (WayCustom {}) = False+wayRTSOnly WayThreaded = True+wayRTSOnly WayDebug = True+wayRTSOnly WayDyn = False+wayRTSOnly WayProf = False+wayRTSOnly WayEventLog = True
+ LICENSE view
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It is safest+to attach them to the start of each source file to most effectively+state the exclusion of warranty; and each file should have at least+the "copyright" line and a pointer to where the full notice is found.++ <one line to give the program's name and a brief idea of what it does.>+ Copyright (C) <year> <name of author>++ This program is free software: you can redistribute it and/or modify+ it under the terms of the GNU General Public License as published by+ the Free Software Foundation, either version 3 of the License, or+ (at your option) any later version.++ This program is distributed in the hope that it will be useful,+ but WITHOUT ANY WARRANTY; without even the implied warranty of+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the+ GNU General Public License for more details.++ You should have received a copy of the GNU General Public License+ along with this program. If not, see <http://www.gnu.org/licenses/>.++Also add information on how to contact you by electronic and paper mail.++ If the program does terminal interaction, make it output a short+notice like this when it starts in an interactive mode:++ <program> Copyright (C) <year> <name of author>+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.+ This is free software, and you are welcome to redistribute it+ under certain conditions; type `show c' for details.++The hypothetical commands `show w' and `show c' should show the appropriate+parts of the General Public License. Of course, your program's commands+might be different; for a GUI interface, you would use an "about box".++ You should also get your employer (if you work as a programmer) or school,+if any, to sign a "copyright disclaimer" for the program, if necessary.+For more information on this, and how to apply and follow the GNU GPL, see+<http://www.gnu.org/licenses/>.++ The GNU General Public License does not permit incorporating your program+into proprietary programs. If your program is a subroutine library, you+may consider it more useful to permit linking proprietary applications with+the library. If this is what you want to do, use the GNU Lesser General+Public License instead of this License. But first, please read+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+ LICENSE.GHC view
@@ -0,0 +1,31 @@+The Glasgow Haskell Compiler License++Copyright 2002, The University Court of the University of Glasgow.+All rights reserved.++Redistribution and use in source and binary forms, with or without+modification, are permitted provided that the following conditions are met:++- Redistributions of source code must retain the above copyright notice,+this list of conditions and the following disclaimer.++- Redistributions in binary form must reproduce the above copyright notice,+this list of conditions and the following disclaimer in the documentation+and/or other materials provided with the distribution.++- Neither name of the University nor the names of its contributors may be+used to endorse or promote products derived from this software without+specific prior written permission.++THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY COURT OF THE UNIVERSITY OF+GLASGOW AND THE CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND+FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE+UNIVERSITY COURT OF THE UNIVERSITY OF GLASGOW OR THE CONTRIBUTORS BE LIABLE+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH+DAMAGE.
+ README.md view
@@ -0,0 +1,66 @@+Haskell dynamic library loader+==============================++Load and execute functions from Haskell dynamic libraries without being+restricted to a single RTS/GHC version.++This package consists of the initial loader executable `rts-loader` written+in plain C and a Haskell library providing a convinient interface to it. The+initial loader executable is implemented in C since writing it in Haskell would+mean linking against the RTS which means we can't load libraries compiled with+another version of GHC.++In order to get Cabal to compile a pure C executable while not linking against+the RTS still some hacks in `Setup.hs` are employed to call `gcc` directly so+beware.++Usage+-----++The example below will locate the package "foopkg" in the package databases+configured for the Cabal project in the current directory and execute the+function "main" from the module "Lib". The package can be found in+`tests/lib` in the rts-loader source tree.++To run the example, execute the following commands in the rts-loader source+tree.++```+$ cabal install --only-dependencies && cabal configure && cabal build && cabal install tests/lib+$ rts_loader_libexecdir=dist/build/rts-loader dist/build/rts-loader-example/rts-loader-example+```++`rts_loader_libexecdir=...` is only required if you didn't install rts-loader+into a sandbox or elsewhere already.++ import System.Loader.RTS+ import System.Process+ + import Distribution.Verbosity+ import Distribution.Package+ import Distribution.Simple.Configure+ + import Distribution.Simple.LocalBuildInfo+ import Distribution.Simple.Configure (getPersistBuildConfig)+ + main :: IO ()+ main = do+ lbi <- getPersistBuildConfig "dist"+ + let verbosity = normal+ comp = compiler lbi+ pkg_db_stack = withPackageDB lbi+ prog_conf = withPrograms lbi+ + pidx <- getInstalledPackages verbosity comp pkg_db_stack prog_conf+ + loader_exe <- loaderExecutablePath+ loader_args <- loaderInvocation (SymbolIdentifier "Lib" "main") [] <$>+ (resolveLibraryInfo comp [WayDyn] $+ lookupLibraryInfo pidx $+ PQName $ PackageName "foopkg")+ + print =<< rawSystem loader_exe loader_args+ +We use information written by `cabal configure` (see `getPersistBuildConfig`)+for convinience only this is not actually required to use the loader.
+ Setup.hs view
@@ -0,0 +1,138 @@+{-# LANGUAGE NamedFieldPuns #-}+import Control.Applicative+import Control.Arrow+import Control.Monad+import Data.Maybe+import Distribution.Verbosity+import Distribution.Simple+import Distribution.Simple.Setup+import Distribution.Simple.Program.Builtin+import Distribution.Simple.Program.Run+import Distribution.Simple.Program.Db+import Distribution.Simple.LocalBuildInfo+import Distribution.Simple.GHC+import Distribution.Simple.Utils+import Distribution.Simple.Build+import Distribution.Simple.Install+import Distribution.Simple.Configure+import Distribution.PackageDescription+import System.FilePath++import System.IO++main = defaultMainWithHooks $ simpleUserHooks {+ buildHook = myBuildHook,+ preBuild = myPreBuild,+ instHook = myInst,+ copyHook = myCopy+ }++-- Set loader buildability to false since we're building that ourselfs+myPreBuild args flags = return $ buildableHBI "rts-loader" False++myBuildHook pd lbi uh flags = do+ buildLoaderExecutable pd lbi flags+ -- gah Cabal throws an error if there are no buildable components+ unless (null $ allBuildInfo pd) $+ (buildHook simpleUserHooks) pd lbi uh flags++buildLoaderExecutable pd lbi flags = do+ let distPref = fromFlag (buildDistPref flags)+ verbosity = fromFlag (buildVerbosity flags)++ (ghc, _) <- requireProgram verbosity ghcProgram (withPrograms lbi)+ (gcc, _) <- requireProgram verbosity gccProgram (withPrograms lbi)++ ghcInfo <- getGhcInfo verbosity ghc++ let [Executable {exeName=exeName', modulePath}] =+ filter ((== "rts-loader") . exeName) $ executables pd+ targetDir = buildDir lbi </> exeName'+ exeDir = targetDir </> (exeName' ++ "-tmp")++ createDirectoryIfMissingVerbose verbosity True targetDir+ createDirectoryIfMissingVerbose verbosity True exeDir++ let Just libDir = lookup "LibDir" ghcInfo+ includes = [libDir </> "include"]+ includeOpts = map ("-I"++) includes+ libs = ["dl"]+ libOpts = map ("-l"++) libs+ opts = ["-o", targetDir </> exeName']+ ++ includeOpts+ ++ libOpts+ ++ [modulePath]++ gccInvokation = programInvocation gcc opts++ runProgramInvocation verbosity gccInvokation+++myInst = myInstOrCopy instHook installVerbosity+myCopy = myInstOrCopy copyHook copyVerbosity++myInstOrCopy :: (UserHooks+ -> PackageDescription+ -> LocalBuildInfo+ -> UserHooks+ -> flags+ -> IO ())+ -> (flags -> Distribution.Simple.Setup.Flag Verbosity)+ -> PackageDescription+ -> LocalBuildInfo+ -> UserHooks+ -> flags+ -> IO ()+myInstOrCopy hook verbosity pd lbi hooks flags = do+ let [exe] = filter ((=="rts-loader") . exeName) (executables pd)+ Just install_dir =+ lookup "x-install-dir" $ customFieldsBI $ buildInfo exe++ libexec = fromPathTemplate $ libexecdir (installDirTemplates lbi)+ install_dir' = toPathTemplate $ substLibexecdir libexec install_dir++ lbi_libexec = modifyInstallDirTemplates (setBindir install_dir') lbi++ hbi_only_exe = disableAllInstallComponentsExcept pd "rts-loader"+ hbi_not_exe = buildableHBI "rts-loader" False++ pd_only_exe = updatePackageDescription hbi_only_exe pd+ pd_not_exe = updatePackageDescription hbi_not_exe pd++ distPref <- findDistPrefOrDefault (copyDistPref defaultCopyFlags)++ let copyFlags = defaultCopyFlags { copyDistPref = toFlag distPref+ , copyVerbosity = verbosity flags+ }++ install pd_only_exe lbi_libexec copyFlags++ (hook simpleUserHooks) pd_not_exe lbi hooks flags+ where+ modifyInstallDirTemplates f lbi =+ lbi { installDirTemplates = f (installDirTemplates lbi) }+ setBindir bindir' inst_dirs =+ inst_dirs { bindir = bindir' }++ substLibexecdirComp libexec "$libexecdir" = libexec+ substLibexecdirComp _ comp = comp++ substLibexecdir libexec = onSplitPath $+ map (substLibexecdirComp libexec . dropTrailingPathSeparator)+++ onSplitPath f p = joinPath $ f (splitPath p)+++buildableHBI pkg build =+ (Nothing, [(pkg, setBuildable build)])++setBuildable build = emptyBuildInfo { buildable = build }++disableAllInstallComponentsExcept pd except =+ let lib = (const (setBuildable False)) <$> library pd+ exes = [ (exeName exe, setBuildable (exeName exe == except))+ | exe <- executables pd+ ]+ in+ (lib, exes)
+ System/Loader/RTS.hs view
@@ -0,0 +1,314 @@+-- |+-- Module : System.Loader.RTS+-- Copyright : Copyright (C) 2016 Daniel Gröber+-- License : GPLv3++--+-- Stability : experimental+--+-- Portability : tested on Linux, might work on OSX, will support Win32 in the+-- future if possible+--+-- Dynamically load entrypoints from Haskell libraries independent of the RTS+-- version.+--++-- This program is free software: you can redistribute it and/or modify+-- it under the terms of the GNU General Public License as published by+-- the Free Software Foundation, either version 3 of the License, or+-- (at your option) any later version.+--+-- This program is distributed in the hope that it will be useful,+-- but WITHOUT ANY WARRANTY; without even the implied warranty of+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the+-- GNU General Public License for more details.+--+-- You should have received a copy of the GNU General Public License+-- along with this program. If not, see <http://www.gnu.org/licenses/>.++module System.Loader.RTS+ (+ -- * Functions+ lookupLibraryInfo+ , resolveLibraryInfo+ , loaderInvocation+ , loaderExecutablePath++ -- * Type Synonyms+ , ModuleName+ , OccName++ -- * Datatypes+ , PackageQualifier(..)+ , SymbolIdentifier(..)++ -- * Internal Datatypes+ , LibraryInfo+ , ResolvedLibraryInfo++ , Way(..)+ , module Distribution.Simple.PackageIndex+ , module Distribution.Compiler+ ) where++import Control.Monad+import Data.Version+import Data.Maybe+import Data.List+import Text.Encoding.Z+import System.Info+import System.FilePath+import System.Directory++import GHC.Way++import Distribution.Text+import Distribution.Package hiding (installedUnitId)+import Distribution.Compiler+import Distribution.Simple.Compiler+import Distribution.Simple.PackageIndex+import Distribution.InstalledPackageInfo++import Paths_rts_loader++-- | Encodes the ways a package can be looked up in a 'PackageIndex'+data PackageQualifier = PQName PackageName -- ^ Identify a package by just its+ -- name, if multiple packages match+ -- the latest version is picked but+ -- which unit id is picked is+ -- undefined.+ | PQId PackageId -- ^ Identify a package by its name+ -- and version. If multiple packages+ -- are found with varying unit ids+ -- which one is picked is undefined.+ | PQUnitId UnitId -- ^ Fully qualified package only one+ -- package matching can be present in+ -- a package database.+ deriving(Eq, Ord, Read, Show)++-- | Identify a binder (aka. a "symbol" at the object file level) within a+-- package.+data SymbolIdentifier = SymbolIdentifier ModuleName OccName+ deriving(Eq, Ord, Read, Show)++sortByVersion :: [(Version, [a])] -> [(Version, [a])]+sortByVersion = sortBy comp+ where+ comp (a,_) (b, _) = a `compare` b++lookupPackageQualifier :: PackageIndex a -> PackageQualifier -> Maybe a+lookupPackageQualifier pidx (PQName pkg_name) = do+ (_ver, pkgs) <- listToMaybe $ reverse $ sortByVersion $+ lookupPackageName pidx pkg_name+ listToMaybe pkgs+lookupPackageQualifier pidx (PQId pkg_id) =+ listToMaybe $ lookupSourcePackageId pidx pkg_id+lookupPackageQualifier pidx (PQUnitId unit_id) =+ lookupUnitId pidx unit_id++-- | Information about a library extracted from a package database stack.+data LibraryInfo = LibraryInfo String [FilePath] [InstalledPackageInfo]++-- | Everything in 'LibraryInfo' plus fully resolved library paths.+data ResolvedLibraryInfo = ResolvedLibraryInfo LibraryInfo [FilePath]++ -- TODO: enumerating all packages is silly slow+-- pidx <- getInstalledPackages verbosity comp pkg_db_stack prog_conf+++-- | CompilerId GHC ver <- compilerId comp = let+ -- -> Compiler+ -- -- ^ Compiler information used (among other things) to+ -- -- construct the library suffix+ -- -- ex. @libHSfoo-0.1-SOMEHASH-ghc7.10.3.so@+ -- -> PackageDBStack+ -- -- ^ Where to look for installed libraries+ -- -> ProgramConfiguration+ -- -- ^ We need @ghc-pkg@ to list installed libraries++-- | @lookupLibraryInfo pkg_index pkg_qual@+--+-- Gets all the information required for loading a library from a package+-- database out of the corresponding package index @pkg_index@. The desired+-- package is identified using @pkg_qual@ which allows doing the lookup by name,+-- name+version or the unique "unit id" associated with a package.+--+-- The @pkg_index@ must at the very least contain the packages "base", "rts" and+-- the package identified by @pkg_qual@. The packages "base" and "rts" are+-- required because of GHC bug+-- <https://ghc.haskell.org/trac/ghc/ticket/10352 #10352> thus this restriction might disappear eventually.+--+-- The required package index can be obtained using+-- @'Distribution.Simple.Configure.getInstalledPackages' verbosity comp+-- pkg_db_stack prog_conf@+lookupLibraryInfo :: InstalledPackageIndex -> PackageQualifier -> LibraryInfo+lookupLibraryInfo pidx pkg_qual = let+ lookupPkg = lookupPackageQualifier pidx++ Just ipi = lookupPackageQualifier pidx pkg_qual+ Just base_ipi = lookupPkg (PQName $ PackageName "base")+ Just rts_ipi = lookupPkg (PQName $ PackageName "rts")++ pkg_key = compatPackageKey ipi++ ipis = [ipi, base_ipi, rts_ipi]+ libdirs = libraryDirs `concatMap` ipis+ in+ LibraryInfo pkg_key libdirs ipis++-- | @resolveLibraryInfo comp ways li@+--+-- Find libraries mentioned in @li@ on the filesystem.+--+-- * @comp@ identifies the compiler (version, ABI etc.) and+--+-- * @ways@ allows looking for the different library versions, i.e. "plain",+-- "profiled", "threaded" and combinations thereof (note that order is+-- significant"). Usually you'll just want @[WayDyn]@ though even this is+-- implied so @[]@ would suffice for a plain library.+--+-- See <https://ghc.haskell.org/trac/ghc/wiki/Commentary/Rts/CompilerWays GHC-Wiki/Commentary/Rts/CompilerWays>.+resolveLibraryInfo :: Compiler+ -> [Way]+ -> LibraryInfo+ -> IO ResolvedLibraryInfo+resolveLibraryInfo comp ways li@(LibraryInfo _ libdirs ipis)+ | CompilerId GHC _ <- compilerId comp =+ ResolvedLibraryInfo li <$> forM ipis resolveLibrary+ where+ comp_abi = showGHCCompilerIdWithAbi comp+ resolveLibrary ipi = do+ let PackageIdentifier (PackageName pkg_name) _ = sourcePackageId ipi+ [lib] = filter (isPrefixOf ("HS"++pkg_name)) $ hsLibraries ipi++ ways' = filter wayRTSOnly ways+ lib' | "rts" <- pkg_name, [] <- ways' = lib+ | "rts" <- pkg_name =+ lib ++ "_" ++ intercalate "-" (map wayTag ways')+ | otherwise = lib++ Just lib'' <- findLibrary libdirs comp_abi lib'+ return lib''++-- | @loaderInvocation sym args rli@+--+-- Construct the commandline for the @rts-loader@ program which+--+-- * loads the library described by @rli@,+--+-- * executes @sym@ as its "main" function (i.e. it should be of type @IO ()@)+-- and+--+-- * passes the command line arguments @args@ via the environment.+loaderInvocation :: SymbolIdentifier+ -> [String] -- ^ Command line arguments to pass to hs_main+ -> ResolvedLibraryInfo+ -> [String]+loaderInvocation sym args (ResolvedLibraryInfo (LibraryInfo pkey _ _) libs) =+ let Symbol sym' = mkSymbol pkey sym "closure"+ loader_args = concat [[sym'], libs, ["--"], args]+ in+ loader_args++-- | Path to the "@rts-loader@" executable distributed along with this+-- library, "@$libexec/rts-loader@". If set the environment variable+-- @rts_loader_libexecdir@ is used instead of Cabal's "@$libexec@" variable+-- which was set during installation time.+loaderExecutablePath :: IO FilePath+loaderExecutablePath = (</> "rts-loader") <$> getLibexecDir++-- | Just the compiler flavor and version parts of 'showGHCCompilerIdWithAbi'+showGHCCompilerId :: Compiler -> String+showGHCCompilerId comp = let+ CompilerId flav ver = compilerId comp+ in+ display flav ++ display ver++-- | Print the library ABI string for GHC, returns something like @ghc7.10.3@+-- depending on the version. This is the postfix appended to shared library+-- names eg. "libHSzenc-0.1.1-5nxwDFCcrv6wKRoUdekV7-ghc7.10.3.so".++-- I'm not sure how other compilers handle this, probably none of them even+-- support shared libraries so what does it matter anyways ;)+showGHCCompilerIdWithAbi :: Compiler -> String+showGHCCompilerIdWithAbi comp =+ showGHCCompilerId comp +++ case compilerAbiTag comp of+ NoAbiTag -> []+ AbiTag xs -> xs++-- | @findLibrary dirs comp_abi lib@.+--+-- Search for Haskell library @lib@ in @dirs@ while taking into account the+--compiler id @comp_abi@ (see 'showGHCCompilerIdWithAbi') as well as relevant+--platform conventions namely library prefix and extension. @lib@ must be given+--without a "lib" prefix and without an extension.+findLibrary :: [FilePath] -> String -> String -> IO (Maybe FilePath)+findLibrary dirs comp_abi lib = do+ let (prefix, ext) = libraryPathStuff+ lib' = prefix ++ intercalate "-" [lib, comp_abi] <.> ext+ findFile dirs lib'++-- | Library prefix and extension based on 'System.Info.os', eg. on Linux+-- @("lib", "so")@+libraryPathStuff :: (String, String)+libraryPathStuff =+ case os of+ "linux" -> ("lib", "so")++ -- untested+ "mingw32" -> ("", "dll")+ "cygwin" -> ("", "dll")+ "darwin" -> ("", "dylib")+ _ -> error "libraryPathStuff: unknown operating system"++-- | A regular Haskell module name eg. @System.Loader.RTS@+type ModuleName = String++-- | An unqualified name of a binder eg. @main@+type OccName = String++-- | The name of a symbol as it occurs in a compiled Haskell object file. Must+-- be constructed by 'mkSymbol'. The precise format varies across GHC versions,+-- see 'nameToCLabel' in compiler/ghci/ByteCodeLink.hs.+data Symbol = Symbol String++-- | @mkSymbol pkg_key (SymbolIdentifier module_name occ_name) suffix@+--+-- Constructs a well formed 'Symbol' when+--+-- * @pkg_key@ is a valid package key as can be found in the @key@ field of a+-- package database @.conf@ file,+--+-- * @module_name@ is a valid Haskell module name (modid),+--+-- * @occ_name@ is a valid Haskell variable identifier (varid),+--+-- * @suffix@ is at least one of @["con_info", "closure"]@ (other valid options+-- can be found scattered across the GHC source code. The most interesting+-- option is "closure" as this is what the entry points to functions are called.+mkSymbol :: String -> SymbolIdentifier -> String -> Symbol+mkSymbol pkg_key (SymbolIdentifier module_name occ_name) suffix =+ Symbol sym+ where+ sym = concat+ [ prefixUnderscore+ , if pkg_key == mainPackageKey then "" else zEncodeString pkg_key ++ "_"+ , zEncodeString module_name+ , '_':zEncodeString occ_name+ , '_':suffix+ ]++-- I'm not sure I even need this here since we only deal with external libraries+-- but it shouldn't hurt+mainPackageKey :: String+mainPackageKey = "main"++prefixUnderscore :: String+prefixUnderscore =+ case (os,arch) of+ ("mingw32","x86_64") -> ""+ ("cygwin","x86_64") -> ""+ ("mingw32",_) -> "_"+ ("darwin",_) -> "_"+ ("cygwin",_) -> "_"+ _ -> ""
+ rts-loader.c view
@@ -0,0 +1,238 @@+/*+ * rts-loader: Dynamically load the GHC runtime system+ * Copyright (C) 2016 Daniel Gröber+ *+ * This program is free software: you can redistribute it and/or modify+ * it under the terms of the GNU General Public License as published by+ * the Free Software Foundation, either version 3 of the License, or+ * (at your option) any later version.+ *+ * This program is distributed in the hope that it will be useful,+ * but WITHOUT ANY WARRANTY; without even the implied warranty of+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the+ * GNU General Public License for more details.+ *+ * You should have received a copy of the GNU General Public License+ * along with this program. If not, see <http://www.gnu.org/licenses/>.+ */++#define _GNU_SOURCE+#include <stdbool.h>+#include <string.h>+#include <assert.h>+#include <dlfcn.h>+#include <unistd.h>++#include <Rts.h>++#include "log.h"++#if defined(__gnu_linux__)+#define LD_PRELOAD "LD_PRELOAD"+#elif defined(__APPLE__)+#define LD_PRELOAD "DYLD_INSERT_LIBRARIES"+#else+#error "unsupported OS"+#endif++bool is_basename_prefix_of(const char *pfx, const char *path)+{+ // GNU basename "never modifies its argument"+ return strncmp(pfx, basename(path), strlen(pfx)) == 0;+}++bool is_rtslib(const char *path)+{+ return is_basename_prefix_of("libHSrts", path);+}++bool is_baselib(const char *path)+{+ return is_basename_prefix_of("libHSbase", path);+}++void usage(char *progname)+{+ printf("Usage: %s MAIN_CLOSURE [PRELOAD_LIBS..] libHSrts-*.so* libHSbase-*.so* [LIBS..] -- [HS_ARGV..]\n", progname);+}++int preloader(int argc, char *argv[])+{+ if(argc < 2) {+ usage(argv[0]);+ return 1;+ }++ size_t preload_blen = 128;+ size_t preload_slen = 0;+ char* preload = calloc(preload_blen, 1);+ char *preload_ptr = preload;+ if(!preload)+ log_error(return 1, "malloc() failed");++ char *rts = NULL;+ char *base = NULL;++ int i = 2;+ for(; i < argc; i++) {+ char *path = argv[i];+ log_debug("path: %s", path);++ if(preload_slen + strlen(path) + strlen(" ") + 1 > preload_blen)+ {+ preload_blen *= 2;+ preload = realloc(preload, preload_blen);+ preload_ptr = strchr(preload, '\0');+ }++ int nchar = snprintf(preload_ptr, preload_blen - preload_slen, "%s ", path);+ if(nchar < 0)+ log_errno(return 1, "snprintf() failed");+ preload_slen += nchar;+ preload_ptr += nchar;+ assert(strlen(preload_ptr) < preload_blen);+ assert(preload_slen < preload_blen);++ if(is_rtslib(path)) {+ rts = path;+ } else if(is_baselib(path)) {+ base = path;+ }++ if(rts && base) {+ break;+ }+ }++ const char *old_preload = getenv(LD_PRELOAD) ? getenv(LD_PRELOAD) : "";+ size_t final_preload_len = strlen(old_preload) + 1 + strlen(preload);+ char *final_preload = malloc(final_preload_len);+ if(!final_preload)+ log_error(return 1, "malloc() failed");++ int nchar = snprintf(final_preload, final_preload_len, "%s %s", old_preload, preload);+ if(nchar < 0)+ log_errno(return 1, "snprintf() failed");+++ log_debug(LD_PRELOAD"=\"%s\"", final_preload);++ setenv("OLD_" LD_PRELOAD, old_preload, true);+ setenv(LD_PRELOAD, final_preload, true);+ free(final_preload);++ if(strlen(argv[0]) < 1)+ abort();++ char *argv0 = strdup(argv[0]);++ basename(argv[0])[0] = '=';++ int rv = execvp(argv0, argv);+ if(rv < 0)+ log_errno(return 1, "execvp() failed %d", errno);++ abort();+}++int loader(int argc, char *argv[], char ***hs_argv)+{+ if(argc < 2)+ abort();++ setenv(LD_PRELOAD, getenv("OLD_" LD_PRELOAD) ? getenv("OLD_" LD_PRELOAD) : "", true);+ unsetenv("OLD_" LD_PRELOAD);++ char *rts = NULL;+ char *base = NULL;++ int i=1;+ for(; i < argc; i++) {+ char *path = argv[i];+ if(is_rtslib(path)) {+ rts = path;+ } else if(is_baselib(path)) {+ base = path;+ } else+ continue;++ if(rts && base)+ break;+ }++ for(i++; i < argc; i++) {+ char *path = argv[i];++ if(strcmp(path, "--") == 0) {+ *hs_argv = &argv[i+1];+ return 0;+ }++ log_debug("opening %s", path);+ void* addr = dlopen(path, RTLD_GLOBAL | RTLD_LAZY);+ if(!addr)+ log_error(return 1, "dlopen(%s) failed: %s", path, dlerror());+ }++ log_error(return 1, "no libraries given or '--' missing");+}++typedef int (*rts_main_t)( int argc, char *argv[], StgClosure *main_closure, RtsConfig rts_config);+int main(int argc, char *argv[])+{+ if(argc < 1)+ abort();++ char* progbase = basename(argv[0]);++ if(strncmp(progbase, "=", 1) != 0) {+ return preloader(argc, argv);+ }++ if(argc < 2) {+ usage(argv[0]);+ return 1;+ }++ char *main_symbol = argv[1];+ char **hs_argv = NULL;+ int rv = loader(argc, argv, &hs_argv);+ if(rv != 0)+ log_error(return rv, "loading libraries failed");++ int hs_argc = 0;++ for(char **tmp = hs_argv; *tmp; tmp++) {+ hs_argc++;+ log_debug("hs_argv: %s", *tmp);+ }++ log_debug("hs_argc: %d", hs_argc);++ void *defRtsCfg_p = dlsym(RTLD_DEFAULT, "defaultRtsConfig");+ if(!defRtsCfg_p)+ log_error(return 1, "\"defaultRtsConfig\" symbol not found");++ StgClosure *main_closure =+ (StgClosure*) dlsym(RTLD_DEFAULT, main_symbol);+ if(!main_closure)+ log_error(return 1, "main closure (%s) not found", main_symbol);++ log_debug("main_symbol: %s %p", main_symbol, main_closure);++ RtsConfig __conf;+ memcpy(&__conf, defRtsCfg_p, sizeof(__conf));+ __conf.rts_opts_enabled = RtsOptsSafeOnly;+ #if __GLASGOW_HASKELL__ >= 708+ __conf.rts_hs_main = rtsTrue;+ #endif++ rts_main_t hs_main_ = dlsym(RTLD_DEFAULT, "hs_main");+ if(!hs_main_)+ log_error(return 1, "hs_main symbol not found");++ log_debug("executing hs_main");+ return hs_main_(hs_argc, hs_argv, main_closure,__conf);++ return 0;+}
+ rts-loader.cabal view
@@ -0,0 +1,61 @@+name: rts-loader+version: 0.0.0.0+synopsis: Dynamically load Haskell libraries+description:+ Load and execute functions from Haskell dynamic libraries without being+ restricted to a single RTS/GHC version.+ .+ See README.md below for more information.++homepage: https://github.com/DanielG/rts-loader+license: GPL-3+license-file: LICENSE+license-files: LICENSE LICENSE.GHC+author: Daneil Gröber+maintainer: dxld@darkboxed.org+copyright: Copyright (C) 2016 Daniel Gröber+category: Distribution+cabal-version: >= 1.24.0.0+build-type: Custom+extra-source-files: ChangeLog, README.md+tested-with: GHC == 7.10.3, GHC == 8.0.1++library+ exposed-modules: System.Loader.RTS+ other-modules: Paths_rts_loader,+ GHC.Way+ default-language: Haskell2010+ build-depends: base < 4.10 && >= 4.8.0.0,+ zenc == 0.1.1,+ unix < 2.8 && >= 2.7.1.0,+ filepath < 1.5 && >= 1.4.0.0,+ directory < 1.3 && >= 1.2.2.0,+ Cabal < 1.25 && >= 1.24.0.0++executable rts-loader+ main-is: rts-loader.c+ x-install-dir: $libexecdir+ -- PR pending: https://github.com/haskell/cabal/pull/3461+ -- install-dir: $libexecdir+ default-language:+ -- Not really, it's C actually. See Setup.hs+ Haskell98++executable rts-loader-example+ main-is: Example.hs+ default-language: Haskell2010+ hs-source-dirs: src++ build-depends: base < 4.10 && >= 4.8.0.0,+ Cabal < 1.25 && >= 1.24.0.0,+ process < 1.5 && >= 1.2.3.0,+ rts-loader++custom-setup+ setup-depends: base < 4.10 && >= 4.8.0.0,+ filepath < 1.5 && >= 1.4.0.0,+ Cabal < 1.25 && >= 1.24.0.0++source-repository head+ type: git+ location: https://github.com/DanielG/rts-loader.git
+ src/Example.hs view
@@ -0,0 +1,28 @@+import System.Loader.RTS+import System.Process++import Distribution.Verbosity+import Distribution.Package+import Distribution.Simple.Configure++import Distribution.Simple.LocalBuildInfo+import Distribution.Simple.Configure (getPersistBuildConfig)++main :: IO ()+main = do+ lbi <- getPersistBuildConfig "dist"++ let verbosity = normal+ comp = compiler lbi+ pkg_db_stack = withPackageDB lbi+ prog_conf = withPrograms lbi++ pidx <- getInstalledPackages verbosity comp pkg_db_stack prog_conf++ loader_exe <- loaderExecutablePath+ loader_args <- loaderInvocation (SymbolIdentifier "Lib" "main") [] <$>+ (resolveLibraryInfo comp [WayDyn] $+ lookupLibraryInfo pidx $+ PQName $ PackageName "foopkg")++ print =<< rawSystem loader_exe loader_args