[commit: ghc] ghc-8.0: Remove `replaceDynFlags` from `ContainsDynFlags` (9d30644)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : ghc-8.0
Link       : http://ghc.haskell.org/trac/ghc/changeset/9d30644100e636966cf4c2c921e72783bec8e299/ghc

>---------------------------------------------------------------

commit 9d30644100e636966cf4c2c921e72783bec8e299
Author: Thomas Miedema <thomasmiedema at gmail.com>
Date:   Tue Jan 19 11:54:36 2016 +0100

    Remove `replaceDynFlags` from `ContainsDynFlags`
    
    Refactoring only. It's shorter, and brings
    `HasDynFlags/ContainsDynFLags` in line with `HasModule/ContainsModule`.
    Introduce `updTopEnv`.
    
    Reviewed by: bgamari
    
    Differential Revision: https://phabricator.haskell.org/D1832
    
    (cherry picked from commit edc68b2ffe833e487ae6b2b04cd9be18e40a5a5e)


>---------------------------------------------------------------

9d30644100e636966cf4c2c921e72783bec8e299
 compiler/main/DriverPipeline.hs |  2 +-
 compiler/main/DynFlags.hs       |  1 -
 compiler/main/HscTypes.hs       |  4 ----
 compiler/typecheck/TcRnMonad.hs | 24 +++++++++++++-----------
 compiler/typecheck/TcRnTypes.hs |  2 --
 5 files changed, 14 insertions(+), 19 deletions(-)

diff --git a/compiler/main/DriverPipeline.hs b/compiler/main/DriverPipeline.hs
index 2805ec8..64c9a96 100644
--- a/compiler/main/DriverPipeline.hs
+++ b/compiler/main/DriverPipeline.hs
@@ -611,7 +611,7 @@ runPipeline stop_phase hsc_env0 (input_fn, mb_phase)
          -- If we are compiling a Haskell module, and doing
          -- -dynamic-too, but couldn't do the -dynamic-too fast
          -- path, then rerun the pipeline for the dyn way
-         let dflags = extractDynFlags hsc_env
+         let dflags = hsc_dflags hsc_env
          -- NB: Currently disabled on Windows (ref #7134, #8228, and #5987)
          when (not $ platformOS (targetPlatform dflags) == OSMinGW32) $ do
            when isHaskellishFile $ whenCannotGenerateDynamicToo dflags $ do
diff --git a/compiler/main/DynFlags.hs b/compiler/main/DynFlags.hs
index e9fed4b..b016a61 100644
--- a/compiler/main/DynFlags.hs
+++ b/compiler/main/DynFlags.hs
@@ -911,7 +911,6 @@ instance (Monad m, HasDynFlags m) => HasDynFlags (ExceptT e m) where
 
 class ContainsDynFlags t where
     extractDynFlags :: t -> DynFlags
-    replaceDynFlags :: t -> DynFlags -> t
 
 data ProfAuto
   = NoProfAuto         -- ^ no SCC annotations added
diff --git a/compiler/main/HscTypes.hs b/compiler/main/HscTypes.hs
index bf6ad1e..a2ecea1 100644
--- a/compiler/main/HscTypes.hs
+++ b/compiler/main/HscTypes.hs
@@ -409,10 +409,6 @@ data HscEnv
 #endif
  }
 
-instance ContainsDynFlags HscEnv where
-    extractDynFlags env = hsc_dflags env
-    replaceDynFlags env dflags = env {hsc_dflags = dflags}
-
 #ifdef GHCI
 data IServ = IServ
   { iservPipe :: Pipe
diff --git a/compiler/typecheck/TcRnMonad.hs b/compiler/typecheck/TcRnMonad.hs
index b0b1e3d..692e9f3 100644
--- a/compiler/typecheck/TcRnMonad.hs
+++ b/compiler/typecheck/TcRnMonad.hs
@@ -278,6 +278,10 @@ discardResult a = a >> return ()
 getTopEnv :: TcRnIf gbl lcl HscEnv
 getTopEnv = do { env <- getEnv; return (env_top env) }
 
+updTopEnv :: (HscEnv -> HscEnv) -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
+updTopEnv upd = updEnv (\ env@(Env { env_top = top }) ->
+                          env { env_top = upd top })
+
 getGblEnv :: TcRnIf gbl lcl gbl
 getGblEnv = do { env <- getEnv; return (env_gbl env) }
 
@@ -319,16 +323,16 @@ woptM :: WarningFlag -> TcRnIf gbl lcl Bool
 woptM flag = do { dflags <- getDynFlags; return (wopt flag dflags) }
 
 setXOptM :: LangExt.Extension -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
-setXOptM flag = updEnv (\ env@(Env { env_top = top }) ->
-                          env { env_top = top { hsc_dflags = xopt_set (hsc_dflags top) flag}} )
+setXOptM flag =
+  updTopEnv (\top -> top { hsc_dflags = xopt_set (hsc_dflags top) flag})
 
 unsetGOptM :: GeneralFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
-unsetGOptM flag = updEnv (\ env@(Env { env_top = top }) ->
-                            env { env_top = top { hsc_dflags = gopt_unset (hsc_dflags top) flag}} )
+unsetGOptM flag =
+  updTopEnv (\top -> top { hsc_dflags = gopt_unset (hsc_dflags top) flag})
 
 unsetWOptM :: WarningFlag -> TcRnIf gbl lcl a -> TcRnIf gbl lcl a
-unsetWOptM flag = updEnv (\ env@(Env { env_top = top }) ->
-                            env { env_top = top { hsc_dflags = wopt_unset (hsc_dflags top) flag}} )
+unsetWOptM flag =
+  updTopEnv (\top -> top { hsc_dflags = wopt_unset (hsc_dflags top) flag})
 
 -- | Do it flag is true
 whenDOptM :: DumpFlag -> TcRnIf gbl lcl () -> TcRnIf gbl lcl ()
@@ -351,11 +355,9 @@ getGhcMode :: TcRnIf gbl lcl GhcMode
 getGhcMode = do { env <- getTopEnv; return (ghcMode (hsc_dflags env)) }
 
 withDoDynamicToo :: TcRnIf gbl lcl a -> TcRnIf gbl lcl a
-withDoDynamicToo m = do env <- getEnv
-                        let dflags = extractDynFlags env
-                            dflags' = dynamicTooMkDynamicDynFlags dflags
-                            env' = replaceDynFlags env dflags'
-                        setEnv env' m
+withDoDynamicToo =
+  updTopEnv (\top@(HscEnv { hsc_dflags = dflags }) ->
+              top { hsc_dflags = dynamicTooMkDynamicDynFlags dflags })
 
 getEpsVar :: TcRnIf gbl lcl (TcRef ExternalPackageState)
 getEpsVar = do { env <- getTopEnv; return (hsc_EPS env) }
diff --git a/compiler/typecheck/TcRnTypes.hs b/compiler/typecheck/TcRnTypes.hs
index 9edc6a7..6c278c9 100644
--- a/compiler/typecheck/TcRnTypes.hs
+++ b/compiler/typecheck/TcRnTypes.hs
@@ -237,8 +237,6 @@ data Env gbl lcl
 
 instance ContainsDynFlags (Env gbl lcl) where
     extractDynFlags env = hsc_dflags (env_top env)
-    replaceDynFlags env dflags
-        = env {env_top = replaceDynFlags (env_top env) dflags}
 
 instance ContainsModule gbl => ContainsModule (Env gbl lcl) where
     extractModule env = extractModule (env_gbl env)