Replacing copyins and copyouts with data-movement instructions

[ghc-hetmet.git] / compiler / codeGen / SMRep.lhs

diff --git a/compiler/codeGen/SMRep.lhs b/compiler/codeGen/SMRep.lhs
index c2a2a44..28d1707 100644 (file)
--- a/compiler/codeGen/SMRep.lhs
+++ b/compiler/codeGen/SMRep.lhs
@@ -9,6 +9,13 @@ This is here, rather than in ClosureInfo, just to keep nhc happy.
 Other modules should access this info through ClosureInfo.
 
 \begin{code}
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+--     http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
+
 module SMRep (
        -- Words and bytes
        StgWord, StgHalfWord, 
@@ -19,7 +26,7 @@ module SMRep (
        CgRep(..), nonVoidArg,
        argMachRep, primRepToCgRep, primRepHint,
        isFollowableArg, isVoidArg, 
-       isFloatingArg, isNonPtrArg, is64BitArg,
+       isFloatingArg, is64BitArg,
        separateByPtrFollowness,
        cgRepSizeW, cgRepSizeB,
        retAddrSizeW,
@@ -36,7 +43,6 @@ module SMRep (
        rET_SMALL, rET_BIG
     ) where
 
-#include "HsVersions.h"
 #include "../includes/MachDeps.h"
 
 import Id
@@ -46,6 +52,7 @@ import MachOp
 import StaticFlags
 import Constants
 import Outputable
+import FastString
 
 import Data.Word
 \end{code}
@@ -112,20 +119,22 @@ entry to the garbage collector.
 \begin{code}
 data CgRep 
   = VoidArg    -- Void
-  | PtrArg     -- Word-sized Ptr
+  | PtrArg     -- Word-sized heap pointer, followed
+               -- by the garbage collector
   | NonPtrArg  -- Word-sized non-pointer
+               -- (including addresses not followed by GC)
   | LongArg    -- 64-bit non-pointer
   | FloatArg   -- 32-bit float
   | DoubleArg  -- 64-bit float
   deriving Eq
 
 instance Outputable CgRep where
-    ppr VoidArg   = ptext SLIT("V_")
-    ppr PtrArg    = ptext SLIT("P_")
-    ppr NonPtrArg = ptext SLIT("I_")
-    ppr LongArg   = ptext SLIT("L_")
-    ppr FloatArg  = ptext SLIT("F_")
-    ppr DoubleArg = ptext SLIT("D_")
+    ppr VoidArg   = ptext (sLit "V_")
+    ppr PtrArg    = ptext (sLit "P_")
+    ppr NonPtrArg = ptext (sLit "I_")
+    ppr LongArg   = ptext (sLit "L_")
+    ppr FloatArg  = ptext (sLit "F_")
+    ppr DoubleArg = ptext (sLit "D_")
 
 argMachRep :: CgRep -> MachRep
 argMachRep PtrArg    = wordRep
@@ -200,11 +209,6 @@ isFloatingArg DoubleArg = True
 isFloatingArg FloatArg  = True
 isFloatingArg _         = False
 
-isNonPtrArg :: CgRep -> Bool
--- Identify anything which is one word large and not a pointer.
-isNonPtrArg NonPtrArg = True
-isNonPtrArg other     = False
-
 is64BitArg :: CgRep -> Bool
 is64BitArg LongArg = True
 is64BitArg _       = False
@@ -309,7 +313,7 @@ smRepClosureType :: SMRep -> Maybe ClosureType
 smRepClosureType (GenericRep _ _ _ ty) = Just ty
 smRepClosureType BlackHoleRep         = Nothing
 
-smRepClosureTypeInt :: SMRep -> Int
+smRepClosureTypeInt :: SMRep -> StgHalfWord
 smRepClosureTypeInt (GenericRep False 1 0 Constr) = CONSTR_1_0
 smRepClosureTypeInt (GenericRep False 0 1 Constr) = CONSTR_0_1
 smRepClosureTypeInt (GenericRep False 2 0 Constr) = CONSTR_2_0
@@ -344,7 +348,7 @@ smRepClosureTypeInt rep = panic "smRepClosuretypeint"
 
 
 -- We export these ones
-rET_SMALL     = (RET_SMALL     :: Int)
-rET_BIG       = (RET_BIG       :: Int)
+rET_SMALL     = (RET_SMALL     :: StgHalfWord)
+rET_BIG       = (RET_BIG       :: StgHalfWord)
 \end{code}