%
+% (c) The University of Glasgow 2006
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[CgBindery]{Utility functions related to doing @CgBindings@}
\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 CgBindery (
CgBindings, CgIdInfo,
StableLoc, VolatileLoc,
cgIdInfoId, cgIdInfoArgRep, cgIdInfoLF,
- stableIdInfo, heapIdInfo,
+ stableIdInfo, heapIdInfo,
+ taggedStableIdInfo, taggedHeapIdInfo,
letNoEscapeIdInfo, idInfoToAmode,
addBindC, addBindsC,
nukeVolatileBinds,
nukeDeadBindings,
getLiveStackSlots,
+ getLiveStackBindings,
bindArgsToStack, rebindToStack,
- bindNewToNode, bindNewToReg, bindArgsToRegs,
- bindNewToTemp,
+ bindNewToNode, bindNewToUntagNode, bindNewToReg, bindArgsToRegs,
+ bindNewToTemp,
getArgAmode, getArgAmodes,
getCgIdInfo,
getCAddrModeIfVolatile, getVolatileRegs,
#include "HsVersions.h"
import CgMonad
-import CgHeapery ( getHpRelOffset )
-import CgStackery ( freeStackSlots, getSpRelOffset )
-import CgUtils ( cgLit, cmmOffsetW )
-import CLabel ( mkClosureLabel, pprCLabel )
-import ClosureInfo ( mkLFImported, mkLFArgument, LambdaFormInfo )
+import CgHeapery
+import CgStackery
+import CgUtils
+import CLabel
+import ClosureInfo
+import Constants
import Cmm
import PprCmm ( {- instance Outputable -} )
-import SMRep ( CgRep(..), WordOff, isFollowableArg,
- isVoidArg, cgRepSizeW, argMachRep,
- idCgRep, typeCgRep )
-import Id ( Id, idName )
+import SMRep
+import Id
+import DataCon
import VarEnv
-import VarSet ( varSetElems )
-import Literal ( literalType )
-import Maybes ( catMaybes )
-import Name ( isExternalName )
-import StgSyn ( StgArg, StgLiveVars, GenStgArg(..), isStgTypeArg )
-import Unique ( Uniquable(..) )
-import UniqSet ( elementOfUniqSet )
+import VarSet
+import Literal
+import Maybes
+import Name
+import StgSyn
+import Unique
+import UniqSet
import Outputable
+import FastString
+
\end{code}
, cg_rep :: CgRep
, cg_vol :: VolatileLoc
, cg_stb :: StableLoc
- , cg_lf :: LambdaFormInfo }
+ , cg_lf :: LambdaFormInfo
+ , cg_tag :: {-# UNPACK #-} !Int -- tag to be added in idInfoToAmode
+ }
mkCgIdInfo id vol stb lf
= CgIdInfo { cg_id = id, cg_vol = vol, cg_stb = stb,
- cg_lf = lf, cg_rep = idCgRep id }
+ cg_lf = lf, cg_rep = idCgRep id, cg_tag = tag }
+ where
+ tag
+ | Just con <- isDataConWorkId_maybe id,
+ {- Is this an identifier for a static constructor closure? -}
+ isNullaryRepDataCon con
+ {- If yes, is this a nullary constructor?
+ If yes, we assume that the constructor is evaluated and can
+ be tagged.
+ -}
+ = tagForCon con
+
+ | otherwise
+ = funTagLFInfo lf
voidIdInfo id = CgIdInfo { cg_id = id, cg_vol = NoVolatileLoc
, cg_stb = VoidLoc, cg_lf = mkLFArgument id
- , cg_rep = VoidArg }
+ , cg_rep = VoidArg, cg_tag = 0 }
-- Used just for VoidRep things
data VolatileLoc -- These locations die across a call
= NoVolatileLoc
| RegLoc CmmReg -- In one of the registers (global or local)
| VirHpLoc VirtualHpOffset -- Hp+offset (address of closure)
- | VirNodeLoc VirtualHpOffset -- Cts of offset indirect from Node
- -- ie *(Node+offset)
+ | VirNodeLoc ByteOff -- Cts of offset indirect from Node
+ -- ie *(Node+offset).
+ -- NB. Byte offset, because we subtract R1's
+ -- tag from the offset.
+
+mkTaggedCgIdInfo id vol stb lf con
+ = CgIdInfo { cg_id = id, cg_vol = vol, cg_stb = stb,
+ cg_lf = lf, cg_rep = idCgRep id, cg_tag = tagForCon con }
\end{code}
@StableLoc@ encodes where an Id can be found, used by
\begin{code}
instance Outputable CgIdInfo where
- ppr (CgIdInfo id rep vol stb lf)
+ ppr (CgIdInfo id rep vol stb lf _) -- TODO, pretty pring the tag info
= ppr id <+> ptext SLIT("-->") <+> vcat [ppr vol, ppr stb]
instance Outputable VolatileLoc where
heapIdInfo id offset lf_info = mkCgIdInfo id (VirHpLoc offset) NoStableLoc lf_info
letNoEscapeIdInfo id sp lf_info = mkCgIdInfo id NoVolatileLoc (VirStkLNE sp) lf_info
stackIdInfo id sp lf_info = mkCgIdInfo id NoVolatileLoc (VirStkLoc sp) lf_info
-nodeIdInfo id offset lf_info = mkCgIdInfo id (VirNodeLoc offset) NoStableLoc lf_info
+nodeIdInfo id offset lf_info = mkCgIdInfo id (VirNodeLoc (wORD_SIZE*offset)) NoStableLoc lf_info
regIdInfo id reg lf_info = mkCgIdInfo id (RegLoc reg) NoStableLoc lf_info
+taggedStableIdInfo id amode lf_info con
+ = mkTaggedCgIdInfo id NoVolatileLoc (StableLoc amode) lf_info con
+taggedHeapIdInfo id offset lf_info con
+ = mkTaggedCgIdInfo id (VirHpLoc offset) NoStableLoc lf_info con
+untagNodeIdInfo id offset lf_info tag
+ = mkCgIdInfo id (VirNodeLoc (wORD_SIZE*offset - tag)) NoStableLoc lf_info
+
+
idInfoToAmode :: CgIdInfo -> FCode CmmExpr
idInfoToAmode info
= case cg_vol info of {
RegLoc reg -> returnFC (CmmReg reg) ;
- VirNodeLoc nd_off -> returnFC (CmmLoad (cmmOffsetW (CmmReg nodeReg) nd_off) mach_rep) ;
- VirHpLoc hp_off -> getHpRelOffset hp_off ;
+ VirNodeLoc nd_off -> returnFC (CmmLoad (cmmOffsetB (CmmReg nodeReg) nd_off)
+ mach_rep) ;
+ VirHpLoc hp_off -> do { off <- getHpRelOffset hp_off
+ ; return $! maybeTag off };
NoVolatileLoc ->
case cg_stb info of
- StableLoc amode -> returnFC amode
+ StableLoc amode -> returnFC $! maybeTag amode
VirStkLoc sp_off -> do { sp_rel <- getSpRelOffset sp_off
; return (CmmLoad sp_rel mach_rep) }
where
mach_rep = argMachRep (cg_rep info)
+ maybeTag amode -- add the tag, if we have one
+ | tag == 0 = amode
+ | otherwise = cmmOffsetB amode tag
+ where tag = cg_tag info
+
cgIdInfoId :: CgIdInfo -> Id
cgIdInfoId = cg_id
name = idName id
in
if isExternalName name then do
- this_pkg <- getThisPackage
- let ext_lbl = CmmLit (CmmLabel (mkClosureLabel this_pkg name))
+ let ext_lbl = CmmLit (CmmLabel (mkClosureLabel name))
return (stableIdInfo id ext_lbl (mkLFImported id))
else
if isVoidArg (idCgRep id) then
bindNewToNode id offset lf_info
= addBindC id (nodeIdInfo id offset lf_info)
+bindNewToUntagNode :: Id -> VirtualHpOffset -> LambdaFormInfo -> Int -> Code
+bindNewToUntagNode id offset lf_info tag
+ = addBindC id (untagNodeIdInfo id offset lf_info tag)
+
-- Create a new temporary whose unique is that in the id,
-- bind the id to it, and return the addressing mode for the
-- temporary.
-bindNewToTemp :: Id -> FCode CmmReg
+bindNewToTemp :: Id -> FCode LocalReg
bindNewToTemp id
- = do addBindC id (regIdInfo id temp_reg lf_info)
+ = do addBindC id (regIdInfo id (CmmLocal temp_reg) lf_info)
return temp_reg
where
uniq = getUnique id
- temp_reg = CmmLocal (LocalReg uniq (argMachRep (idCgRep id)))
+ temp_reg = LocalReg uniq (argMachRep (idCgRep id)) kind
+ kind = if isFollowableArg (idCgRep id)
+ then GCKindPtr
+ else GCKindNonPtr
lf_info = mkLFArgument id -- Always used of things we
-- know nothing about
cg_rep = rep } <- varEnvElts binds,
isFollowableArg rep] }
\end{code}
+
+\begin{code}
+getLiveStackBindings :: FCode [(VirtualSpOffset, CgIdInfo)]
+getLiveStackBindings
+ = do { binds <- getBinds
+ ; return [(off, bind) |
+ bind <- varEnvElts binds,
+ CgIdInfo { cg_stb = VirStkLoc off,
+ cg_rep = rep} <- [bind],
+ isFollowableArg rep] }
+\end{code}
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