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{-# LANGUAGE RankNTypes #-}
module Plugins (
FrontendPlugin(..), defaultFrontendPlugin, FrontendPluginAction,
Plugin(..), CommandLineOption, LoadedPlugin(..),
defaultPlugin, withPlugins, withPlugins_
) where
import GhcPrelude
import CoreMonad ( CoreToDo, CoreM )
import TcRnTypes ( TcPlugin)
import DynFlags
import GhcMonad
import DriverPhases
import Module ( ModuleName )
import Control.Monad
-- | Command line options gathered from the -PModule.Name:stuff syntax
-- are given to you as this type
type CommandLineOption = String
-- | 'Plugin' is the compiler plugin data type. Try to avoid
-- constructing one of these directly, and just modify some fields of
-- 'defaultPlugin' instead: this is to try and preserve source-code
-- compatibility when we add fields to this.
--
-- Nonetheless, this API is preliminary and highly likely to change in
-- the future.
data Plugin = Plugin {
installCoreToDos :: [CommandLineOption] -> [CoreToDo] -> CoreM [CoreToDo]
-- ^ Modify the Core pipeline that will be used for compilation.
-- This is called as the Core pipeline is built for every module
-- being compiled, and plugins get the opportunity to modify the
-- pipeline in a nondeterministic order.
, tcPlugin :: [CommandLineOption] -> Maybe TcPlugin
-- ^ An optional typechecker plugin, which may modify the
-- behaviour of the constraint solver.
}
-- | A plugin with its arguments. The result of loading the plugin.
data LoadedPlugin = LoadedPlugin {
lpPlugin :: Plugin
-- ^ the actual callable plugin
, lpModuleName :: ModuleName
-- ^ the qualified name of the module containing the plugin
, lpArguments :: [CommandLineOption]
-- ^ command line arguments for the plugin
}
-- | Default plugin: does nothing at all! For compatibility reasons
-- you should base all your plugin definitions on this default value.
defaultPlugin :: Plugin
defaultPlugin = Plugin {
installCoreToDos = const return
, tcPlugin = const Nothing
}
type PluginOperation m a = Plugin -> [CommandLineOption] -> a -> m a
type ConstPluginOperation m a = Plugin -> [CommandLineOption] -> a -> m ()
-- | Perform an operation by using all of the plugins in turn.
withPlugins :: Monad m => DynFlags -> PluginOperation m a -> a -> m a
withPlugins df transformation input
= foldM (\arg (LoadedPlugin p _ opts) -> transformation p opts arg)
input (plugins df)
-- | Perform a constant operation by using all of the plugins in turn.
withPlugins_ :: Monad m => DynFlags -> ConstPluginOperation m a -> a -> m ()
withPlugins_ df transformation input
= mapM_ (\(LoadedPlugin p _ opts) -> transformation p opts input)
(plugins df)
type FrontendPluginAction = [String] -> [(String, Maybe Phase)] -> Ghc ()
data FrontendPlugin = FrontendPlugin {
frontend :: FrontendPluginAction
}
defaultFrontendPlugin :: FrontendPlugin
defaultFrontendPlugin = FrontendPlugin { frontend = \_ _ -> return () }
|
