[commit: ghc] wip/Txxxxx: WIP: don't reenter WHNF thing for re-tagging (8789365)

[git at git.haskell.org]

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

On branch  : wip/Txxxxx
Link       : http://ghc.haskell.org/trac/ghc/changeset/878936583905e3f1506fa65dbd86549f82ef4aa3/ghc

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

commit 878936583905e3f1506fa65dbd86549f82ef4aa3
Author: Gabor Greif <ggreif at gmail.com>
Date:   Wed Dec 27 19:47:50 2017 +0100

    WIP: don't reenter WHNF thing for re-tagging
    
    this is a very crude test. How to make it more robust?


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

878936583905e3f1506fa65dbd86549f82ef4aa3
 compiler/codeGen/StgCmmClosure.hs | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/compiler/codeGen/StgCmmClosure.hs b/compiler/codeGen/StgCmmClosure.hs
index 2501ec9..feb9987 100644
--- a/compiler/codeGen/StgCmmClosure.hs
+++ b/compiler/codeGen/StgCmmClosure.hs
@@ -1,5 +1,5 @@
-{-# LANGUAGE CPP, RecordWildCards #-}
-
+{-# LANGUAGE CPP, RecordWildCards, StandaloneDeriving #-}
+{-# OPTIONS_GHC -Wno-orphans #-}
 -----------------------------------------------------------------------------
 --
 -- Stg to C-- code generation:
@@ -223,8 +223,13 @@ data LambdaFormInfo
                         -- always a value, needs evaluation
 
   | LFLetNoEscape       -- See LetNoEscape module for precise description
+ deriving Show
 
-
+deriving instance Show TopLevelFlag
+deriving instance Show OneShotInfo
+deriving instance Show ArgDescr
+deriving instance Show StandardFormInfo
+instance Show DataCon where show _ = "<DATACON>"
 -------------------------
 -- StandardFormInfo tells whether this thunk has one of
 -- a small number of standard forms
@@ -581,6 +586,10 @@ getCallMethod dflags name id (LFReEntrant _ _ arity _ _) n_args _v_args _cg_loc
 getCallMethod _ _name _ LFUnlifted n_args _v_args _cg_loc _self_loop_info
   = ASSERT( n_args == 0 ) ReturnIt
 
+getCallMethod _ name id (LFUnknown False) 0 _v_args cg_loc _self_loop_info
+  | occNameString (nameOccName name) == "wild"
+  = pprTrace "getCallMethod" (ppr id <+> ppr cg_loc) ReturnIt
+
 getCallMethod _ _name _ (LFCon _) n_args _v_args _cg_loc _self_loop_info
   = ASSERT( n_args == 0 ) ReturnIt
     -- n_args=0 because it'd be ill-typed to apply a saturated