-{-# 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
+{-# OPTIONS_GHC -XNoMonoLocalBinds #-}
+-- Norman likes local bindings
+-- If this module lives on I'd like to get rid of this flag in due course
module CmmCPS (
-- | Converts C-- with full proceedures and parameters
-- to a CPS transformed C-- with the stack made manifest.
- cmmCPS
+ -- Well, sort of.
+ protoCmmCPS
) where
-#include "HsVersions.h"
-
-import BlockId
+import CLabel
import Cmm
-import CmmLint
-import PprCmm
-
-import CmmLive
-import CmmBrokenBlock
+import CmmDecl
+import CmmBuildInfoTables
+import CmmCommonBlockElim
import CmmProcPoint
-import CmmCallConv
-import CmmCPSGen
-import CmmUtils
-
-import ClosureInfo
-import MachOp
-import CLabel
-import SMRep
-import Constants
+import CmmSpillReload
+import CmmStackLayout
+import OptimizationFuel
import DynFlags
import ErrUtils
-import Maybes
+import HscTypes
+import Data.Maybe
+import Control.Monad
+import Data.Map (Map)
+import qualified Data.Map as Map
import Outputable
-import UniqSupply
-import UniqFM
-import UniqSet
-import Unique
-
-import Monad
-import IO
-import Data.List
+import StaticFlags
-----------------------------------------------------------------------------
-- |Top level driver for the CPS pass
-----------------------------------------------------------------------------
-cmmCPS :: DynFlags -- ^ Dynamic flags: -dcmm-lint -ddump-cps-cmm
- -> [Cmm] -- ^ Input C-- with Proceedures
- -> IO [Cmm] -- ^ Output CPS transformed C--
-cmmCPS dflags cmm_with_calls
- = do { when (dopt Opt_DoCmmLinting dflags) $
- do showPass dflags "CmmLint"
- case firstJust $ map cmmLint cmm_with_calls of
- Just err -> do printDump err
- ghcExit dflags 1
- Nothing -> return ()
- ; showPass dflags "CPS"
-
- -- TODO: more lint checking
- -- check for use of branches to non-existant blocks
- -- check for use of Sp, SpLim, R1, R2, etc.
-
- ; uniqSupply <- mkSplitUniqSupply 'p'
- ; let supplies = listSplitUniqSupply uniqSupply
- ; let cpsd_cmm = zipWith doCpsProc supplies cmm_with_calls
-
- ; dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "CPS Cmm" (pprCmms cpsd_cmm)
-
- -- TODO: add option to dump Cmm to file
-
- ; return cpsd_cmm }
-
-
------------------------------------------------------------------------------
--- |CPS a single CmmTop (proceedure)
--- Only 'CmmProc' are transformed 'CmmData' will be left alone.
------------------------------------------------------------------------------
-
-doCpsProc :: UniqSupply -> Cmm -> Cmm
-doCpsProc s (Cmm c)
- = Cmm $ concat $ zipWith cpsProc (listSplitUniqSupply s) c
-
-cpsProc :: UniqSupply
- -> CmmTop -- ^Input procedure
- -> [CmmTop] -- ^Output procedures;
- -- a single input procedure is converted to
- -- multiple output procedures
-
--- Data blocks don't need to be CPS transformed
-cpsProc uniqSupply proc@(CmmData _ _) = [proc]
-
--- Empty functions just don't work with the CPS algorithm, but
--- they don't need the transformation anyway so just output them directly
-cpsProc uniqSupply proc@(CmmProc _ _ _ (ListGraph []))
- = pprTrace "cpsProc: unexpected empty proc" (ppr proc) [proc]
-
--- CPS transform for those procs that actually need it
--- The plan is this:
---
--- * Introduce a stack-check block as the first block
--- * The first blocks gets a FunctionEntry; the rest are ControlEntry
--- * Now break each block into a bunch of blocks (at call sites);
--- all but the first will be ContinuationEntry
---
-cpsProc uniqSupply (CmmProc info ident params (ListGraph blocks)) = cps_procs
- where
- -- We need to be generating uniques for several things.
- -- We could make this function monadic to handle that
- -- but since there is no other reason to make it monadic,
- -- we instead will just split them all up right here.
- (uniqSupply1, uniqSupply2) = splitUniqSupply uniqSupply
- uniques :: [[Unique]]
- uniques = map uniqsFromSupply $ listSplitUniqSupply uniqSupply1
- (stack_check_block_unique:stack_use_unique:adaptor_uniques) :
- block_uniques = uniques
- proc_uniques = map (map (map uniqsFromSupply . listSplitUniqSupply) . listSplitUniqSupply) $ listSplitUniqSupply uniqSupply2
-
- stack_use = CmmLocal (LocalReg stack_use_unique (cmmRegRep spReg) GCKindPtr)
- stack_check_block_id = BlockId stack_check_block_unique
- stack_check_block = make_stack_check stack_check_block_id info stack_use (blockId $ head blocks)
-
- forced_blocks = stack_check_block : blocks
-
- CmmInfo maybe_gc_block_id update_frame _ = info
-
- -- Break the block at each function call.
- -- The part after the function call will have to become a continuation.
- broken_blocks :: ([(BlockId, ContFormat)], [BrokenBlock])
- broken_blocks =
- (\x -> (concatMap fst x, concatMap snd x)) $
- zipWith3 (breakBlock (maybeToList maybe_gc_block_id))
- block_uniques
- forced_blocks
- (FunctionEntry info ident params :
- repeat ControlEntry)
-
- f' = selectContinuations (fst broken_blocks)
- broken_blocks' = map (makeContinuationEntries f') $
- concat $
- zipWith (adaptBlockToFormat f')
- adaptor_uniques
- (snd broken_blocks)
-
- -- Calculate live variables for each broken block.
- --
- -- Nothing can be live on entry to the first block
- -- so we could take the tail, but for now we wont
- -- to help future proof the code.
- live :: BlockEntryLiveness
- live = cmmLiveness $ map cmmBlockFromBrokenBlock broken_blocks'
-
- -- Calculate which blocks must be made into full fledged procedures.
- proc_points :: UniqSet BlockId
- proc_points = calculateProcPoints broken_blocks'
-
- -- Construct a map so we can lookup a broken block by its 'BlockId'.
- block_env :: BlockEnv BrokenBlock
- block_env = blocksToBlockEnv broken_blocks'
-
- -- Group the blocks into continuations based on the set of proc-points.
- continuations :: [Continuation (Either C_SRT CmmInfo)]
- continuations = map (gatherBlocksIntoContinuation live proc_points block_env)
- (uniqSetToList proc_points)
-
- -- Select the stack format on entry to each continuation.
- -- Return the max stack offset and an association list
- --
- -- This is an association list instead of a UniqFM because
- -- CLabel's don't have a 'Uniqueable' instance.
- formats :: [(CLabel, -- key
- (CmmFormalsWithoutKinds, -- arguments
- Maybe CLabel, -- label in top slot
- [Maybe LocalReg]))] -- slots
- formats = selectContinuationFormat live continuations
-
- -- Do a little meta-processing on the stack formats such as
- -- getting the individual frame sizes and the maximum frame size
- formats' :: (WordOff, WordOff, [(CLabel, ContinuationFormat)])
- formats'@(_, _, format_list) = processFormats formats update_frame continuations
-
- -- Update the info table data on the continuations with
- -- the selected stack formats.
- continuations' :: [Continuation CmmInfo]
- continuations' = map (applyContinuationFormat format_list) continuations
-
- -- Do the actual CPS transform.
- cps_procs :: [CmmTop]
- cps_procs = zipWith (continuationToProc formats' stack_use) proc_uniques continuations'
-
-make_stack_check stack_check_block_id info stack_use next_block_id =
- BasicBlock stack_check_block_id $
- check_stmts ++ [CmmBranch next_block_id]
- where
- check_stmts =
- case info of
- -- If we are given a stack check handler,
- -- then great, well check the stack.
- CmmInfo (Just gc_block) _ _
- -> [CmmCondBranch
- (CmmMachOp (MO_U_Lt $ cmmRegRep spReg)
- [CmmReg stack_use, CmmReg spLimReg])
- gc_block]
- -- If we aren't given a stack check handler,
- -- then humph! we just won't check the stack for them.
- CmmInfo Nothing _ _
- -> []
------------------------------------------------------------------------------
-
-collectNonProcPointTargets ::
- UniqSet BlockId -> BlockEnv BrokenBlock
- -> UniqSet BlockId -> [BlockId] -> UniqSet BlockId
-collectNonProcPointTargets proc_points blocks current_targets new_blocks =
- if sizeUniqSet current_targets == sizeUniqSet new_targets
- then current_targets
- else foldl
- (collectNonProcPointTargets proc_points blocks)
- new_targets
- (map (:[]) targets)
- where
- blocks' = map (lookupWithDefaultUFM blocks (panic "TODO")) new_blocks
- targets =
- -- Note the subtlety that since the extra branch after a call
- -- will always be to a block that is a proc-point,
- -- this subtraction will always remove that case
- uniqSetToList $ (unionManyUniqSets $ map (mkUniqSet . brokenBlockTargets) blocks')
- `minusUniqSet` proc_points
- -- TODO: remove redundant uniqSetToList
- new_targets = current_targets `unionUniqSets` (mkUniqSet targets)
-
--- TODO: insert proc point code here
--- * Branches and switches to proc points may cause new blocks to be created
--- (or proc points could leave behind phantom blocks that just jump to them)
--- * Proc points might get some live variables passed as arguments
-
-gatherBlocksIntoContinuation ::
- BlockEntryLiveness -> UniqSet BlockId -> BlockEnv BrokenBlock
- -> BlockId -> Continuation (Either C_SRT CmmInfo)
-gatherBlocksIntoContinuation live proc_points blocks start =
- Continuation info_table clabel params is_gc_cont body
- where
- children = (collectNonProcPointTargets proc_points blocks (unitUniqSet start) [start]) `minusUniqSet` (unitUniqSet start)
- start_block = lookupWithDefaultUFM blocks unknown_block start
- children_blocks = map (lookupWithDefaultUFM blocks unknown_block) (uniqSetToList children)
- unknown_block = panic "unknown block in gatherBlocksIntoContinuation"
- body = start_block : children_blocks
-
- -- We can't properly annotate the continuation's stack parameters
- -- at this point because this is before stack selection
- -- but we want to keep the C_SRT around so we use 'Either'.
- info_table = case start_block_entry of
- FunctionEntry info _ _ -> Right info
- ContinuationEntry _ srt _ -> Left srt
- ControlEntry -> Right (CmmInfo Nothing Nothing CmmNonInfoTable)
-
- is_gc_cont = case start_block_entry of
- FunctionEntry _ _ _ -> False
- ContinuationEntry _ _ gc_cont -> gc_cont
- ControlEntry -> False
-
- start_block_entry = brokenBlockEntry start_block
- clabel = case start_block_entry of
- FunctionEntry _ label _ -> label
- _ -> mkReturnPtLabel $ getUnique start
- params = case start_block_entry of
- FunctionEntry _ _ args -> args
- ContinuationEntry args _ _ -> args
- ControlEntry ->
- uniqSetToList $
- lookupWithDefaultUFM live unknown_block start
- -- it's a proc-point, pass lives in parameter registers
-
---------------------------------------------------------------------------------
--- For now just select the continuation orders in the order they are in the set with no gaps
-
-selectContinuationFormat :: BlockEnv CmmLive
- -> [Continuation (Either C_SRT CmmInfo)]
- -> [(CLabel, (CmmFormalsWithoutKinds, Maybe CLabel, [Maybe LocalReg]))]
-selectContinuationFormat live continuations =
- map (\c -> (continuationLabel c, selectContinuationFormat' c)) continuations
- where
- -- User written continuations
- selectContinuationFormat' (Continuation
- (Right (CmmInfo _ _ (CmmInfoTable _ _ (ContInfo format srt))))
- label formals _ _) =
- (formals, Just label, format)
- -- Either user written non-continuation code
- -- or CPS generated proc-points
- selectContinuationFormat' (Continuation (Right _) _ formals _ _) =
- (formals, Nothing, [])
- -- CPS generated continuations
- selectContinuationFormat' (Continuation (Left srt) label formals _ blocks) =
- -- TODO: assumes the first block is the entry block
- let ident = brokenBlockId $ head blocks -- TODO: CLabel isn't a uniquable, but we need a better way than this
- in (formals,
- Just label,
- map Just $ uniqSetToList $
- lookupWithDefaultUFM live unknown_block ident)
-
- unknown_block = panic "unknown BlockId in selectContinuationFormat"
-
-processFormats :: [(CLabel, (CmmFormalsWithoutKinds, Maybe CLabel, [Maybe LocalReg]))]
- -> Maybe UpdateFrame
- -> [Continuation (Either C_SRT CmmInfo)]
- -> (WordOff, WordOff, [(CLabel, ContinuationFormat)])
-processFormats formats update_frame continuations =
- (max_size + update_frame_size, update_frame_size, formats')
- where
- max_size = maximum $
- 0 : map (continuationMaxStack formats') continuations
- formats' = map make_format formats
- make_format (label, (formals, top, stack)) =
- (label,
- ContinuationFormat {
- continuation_formals = formals,
- continuation_label = top,
- continuation_frame_size = stack_size stack +
- if isJust top
- then label_size
- else 0,
- continuation_stack = stack })
-
- update_frame_size = case update_frame of
- Nothing -> 0
- (Just (UpdateFrame _ args))
- -> label_size + update_size args
-
- update_size [] = 0
- update_size (expr:exprs) = width + update_size exprs
- where
- width = machRepByteWidth (cmmExprRep expr) `quot` wORD_SIZE
- -- TODO: it would be better if we had a machRepWordWidth
-
- -- TODO: get rid of "+ 1" etc.
- label_size = 1 :: WordOff
-
- stack_size [] = 0
- stack_size (Nothing:formats) = 1 + stack_size formats -- one dead word
- stack_size (Just reg:formats) = width + stack_size formats
- where
- width = machRepByteWidth (localRegRep reg) `quot` wORD_SIZE
- -- TODO: it would be better if we had a machRepWordWidth
-
-continuationMaxStack :: [(CLabel, ContinuationFormat)]
- -> Continuation a
- -> WordOff
-continuationMaxStack _ (Continuation _ _ _ True _) = 0
-continuationMaxStack formats (Continuation _ label _ False blocks) =
- max_arg_size + continuation_frame_size stack_format
- where
- stack_format = maybe unknown_format id $ lookup label formats
- unknown_format = panic "Unknown format in continuationMaxStack"
-
- max_arg_size = maximum $ 0 : map block_max_arg_size blocks
-
- block_max_arg_size block =
- maximum (final_arg_size (brokenBlockExit block) :
- map stmt_arg_size (brokenBlockStmts block))
-
- final_arg_size (FinalReturn args) =
- argumentsSize (cmmExprRep . kindlessCmm) args
- final_arg_size (FinalJump _ args) =
- argumentsSize (cmmExprRep . kindlessCmm) args
- final_arg_size (FinalCall next _ _ args _ _ True) = 0
- final_arg_size (FinalCall next _ _ args _ _ False) =
- -- We have to account for the stack used when we build a frame
- -- for the *next* continuation from *this* continuation
- argumentsSize (cmmExprRep . kindlessCmm) args +
- continuation_frame_size next_format
- where
- next_format = maybe unknown_format id $ lookup next' formats
- next' = mkReturnPtLabel $ getUnique next
-
- final_arg_size _ = 0
-
- stmt_arg_size (CmmJump _ args) =
- argumentsSize (cmmExprRep . kindlessCmm) args
- stmt_arg_size (CmmCall _ _ _ (CmmSafe _) _) =
- panic "Safe call in processFormats"
- stmt_arg_size (CmmReturn _) =
- panic "CmmReturn in processFormats"
- stmt_arg_size _ = 0
-
------------------------------------------------------------------------------
-applyContinuationFormat :: [(CLabel, ContinuationFormat)]
- -> Continuation (Either C_SRT CmmInfo)
- -> Continuation CmmInfo
-
--- User written continuations
-applyContinuationFormat formats (Continuation
- (Right (CmmInfo gc update_frame (CmmInfoTable prof tag (ContInfo _ srt))))
- label formals is_gc blocks) =
- Continuation (CmmInfo gc update_frame (CmmInfoTable prof tag (ContInfo format srt)))
- label formals is_gc blocks
- where
- format = continuation_stack $ maybe unknown_block id $ lookup label formats
- unknown_block = panic "unknown BlockId in applyContinuationFormat"
-
--- Either user written non-continuation code or CPS generated proc-point
-applyContinuationFormat formats (Continuation
- (Right info) label formals is_gc blocks) =
- Continuation info label formals is_gc blocks
-
--- CPS generated continuations
-applyContinuationFormat formats (Continuation
- (Left srt) label formals is_gc blocks) =
- Continuation (CmmInfo gc Nothing (CmmInfoTable prof tag (ContInfo (continuation_stack $ format) srt)))
- label formals is_gc blocks
- where
- gc = Nothing -- Generated continuations never need a stack check
- -- TODO prof: this is the same as the current implementation
- -- but I think it could be improved
- prof = ProfilingInfo zeroCLit zeroCLit
- tag = rET_SMALL -- cmmToRawCmm may convert it to rET_BIG
- format = maybe unknown_block id $ lookup label formats
- unknown_block = panic "unknown BlockId in applyContinuationFormat"
-
+-- There are two complications here:
+-- 1. We need to compile the procedures in two stages because we need
+-- an analysis of the procedures to tell us what CAFs they use.
+-- The first stage returns a map from procedure labels to CAFs,
+-- along with a closure that will compute SRTs and attach them to
+-- the compiled procedures.
+-- The second stage is to combine the CAF information into a top-level
+-- CAF environment mapping non-static closures to the CAFs they keep live,
+-- then pass that environment to the closures returned in the first
+-- stage of compilation.
+-- 2. We need to thread the module's SRT around when the SRT tables
+-- are computed for each procedure.
+-- The SRT needs to be threaded because it is grown lazily.
+protoCmmCPS :: HscEnv -- Compilation env including
+ -- dynamic flags: -dcmm-lint -ddump-cps-cmm
+ -> (TopSRT, [Cmm]) -- SRT table and accumulating list of compiled procs
+ -> Cmm -- Input C-- with Procedures
+ -> IO (TopSRT, [Cmm]) -- Output CPS transformed C--
+protoCmmCPS hsc_env (topSRT, rst) (Cmm tops) =
+ do let dflags = hsc_dflags hsc_env
+ showPass dflags "CPSZ"
+ (cafEnvs, tops) <- liftM unzip $ mapM (cpsTop hsc_env) tops
+ let topCAFEnv = mkTopCAFInfo (concat cafEnvs)
+ (topSRT, tops) <- foldM (toTops hsc_env topCAFEnv) (topSRT, []) tops
+ let cmms = Cmm (reverse (concat tops))
+ dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "Post CPS Cmm" (ppr cmms)
+ return (topSRT, cmms : rst)
+
+{- [Note global fuel]
+~~~~~~~~~~~~~~~~~~~~~
+The identity and the last pass are stored in
+mutable reference cells in an 'HscEnv' and are
+global to one compiler session.
+-}
+
+-- EZY: It might be helpful to have an easy way of dumping the "pre"
+-- input for any given phase, besides just turning it all on with
+-- -ddump-cmmz
+
+cpsTop :: HscEnv -> CmmTop -> IO ([(CLabel, CAFSet)], [(CAFSet, CmmTop)])
+cpsTop _ p@(CmmData {}) = return ([], [(Map.empty, p)])
+cpsTop hsc_env (CmmProc h@(TopInfo {stack_info=StackInfo {arg_space=entry_off}}) l g) =
+ do
+ -- Why bother doing these early: dualLivenessWithInsertion,
+ -- insertLateReloads, rewriteAssignments?
+
+ ----------- Eliminate common blocks -------------------
+ g <- return $ elimCommonBlocks g
+ dump Opt_D_dump_cmmz_cbe "Post common block elimination" g
+ -- Any work storing block Labels must be performed _after_ elimCommonBlocks
+
+ ----------- Proc points -------------------
+ let callPPs = callProcPoints g
+ procPoints <- run $ minimalProcPointSet callPPs g
+ g <- run $ addProcPointProtocols callPPs procPoints g
+ dump Opt_D_dump_cmmz_proc "Post Proc Points Added" g
+
+ ----------- Spills and reloads -------------------
+ g <- run $ dualLivenessWithInsertion procPoints g
+ dump Opt_D_dump_cmmz_spills "Post spills and reloads" g
+
+ ----------- Sink and inline assignments -------------------
+ g <- runOptimization $ rewriteAssignments g
+ dump Opt_D_dump_cmmz_rewrite "Post rewrite assignments" g
+
+ ----------- Eliminate dead assignments -------------------
+ -- Remove redundant reloads (and any other redundant asst)
+ g <- runOptimization $ removeDeadAssignmentsAndReloads procPoints g
+ dump Opt_D_dump_cmmz_dead "Post Dead Assignment Elimination" g
+
+ ----------- Zero dead stack slots (Debug only) ---------------
+ -- Debugging: stubbing slots on death can cause crashes early
+ g <- if opt_StubDeadValues
+ then run $ stubSlotsOnDeath g
+ else return g
+ dump Opt_D_dump_cmmz_stub "Post stub dead stack slots" g
+
+ --------------- Stack layout ----------------
+ slotEnv <- run $ liveSlotAnal g
+ let spEntryMap = getSpEntryMap entry_off g
+ mbpprTrace "live slot analysis results: " (ppr slotEnv) $ return ()
+ let areaMap = layout procPoints spEntryMap slotEnv entry_off g
+ mbpprTrace "areaMap" (ppr areaMap) $ return ()
+
+ ------------ Manifest the stack pointer --------
+ g <- run $ manifestSP spEntryMap areaMap entry_off g
+ dump Opt_D_dump_cmmz_sp "Post manifestSP" g
+ -- UGH... manifestSP can require updates to the procPointMap.
+ -- We can probably do something quicker here for the update...
+
+ ------------- Split into separate procedures ------------
+ procPointMap <- run $ procPointAnalysis procPoints g
+ dump Opt_D_dump_cmmz_procmap "procpoint map" procPointMap
+ gs <- run $ splitAtProcPoints l callPPs procPoints procPointMap
+ (CmmProc h l g)
+ mapM_ (dump Opt_D_dump_cmmz_split "Post splitting") gs
+
+ ------------- More CAFs and foreign calls ------------
+ cafEnv <- run $ cafAnal g
+ let localCAFs = catMaybes $ map (localCAFInfo cafEnv) gs
+ mbpprTrace "localCAFs" (ppr localCAFs) $ return ()
+
+ gs <- run $ mapM (lowerSafeForeignCalls areaMap) gs
+ mapM_ (dump Opt_D_dump_cmmz_lower "Post lowerSafeForeignCalls") gs
+
+ -- NO MORE GRAPH TRANSFORMATION AFTER HERE -- JUST MAKING INFOTABLES
+ gs <- return $ map (setInfoTableStackMap slotEnv areaMap) gs
+ mapM_ (dump Opt_D_dump_cmmz_info "after setInfoTableStackMap") gs
+ gs <- return $ map (bundleCAFs cafEnv) gs
+ mapM_ (dump Opt_D_dump_cmmz_cafs "after bundleCAFs") gs
+ return (localCAFs, gs)
+ where dflags = hsc_dflags hsc_env
+ mbpprTrace x y z = if dopt Opt_D_dump_cmmz dflags then pprTrace x y z else z
+ dump f txt g = do
+ -- ToDo: No easy way of say "dump all the cmmz, *and* split
+ -- them into files." Also, -ddump-cmmz doesn't play nicely
+ -- with -ddump-to-file, since the headers get omitted.
+ dumpIfSet_dyn dflags f txt (ppr g)
+ when (not (dopt f dflags)) $
+ dumpIfSet_dyn dflags Opt_D_dump_cmmz txt (ppr g)
+ -- Runs a required transformation/analysis
+ run = runInfiniteFuelIO (hsc_OptFuel hsc_env)
+ -- Runs an optional transformation/analysis (and should
+ -- thus be subject to optimization fuel)
+ runOptimization = runFuelIO (hsc_OptFuel hsc_env)
+
+-- This probably belongs in CmmBuildInfoTables?
+-- We're just finishing the job here: once we know what CAFs are defined
+-- in non-static closures, we can build the SRTs.
+toTops :: HscEnv -> Map CLabel CAFSet -> (TopSRT, [[CmmTop]])
+ -> [(CAFSet, CmmTop)] -> IO (TopSRT, [[CmmTop]])
+toTops hsc_env topCAFEnv (topSRT, tops) gs =
+ do let setSRT (topSRT, rst) g =
+ do (topSRT, gs) <- setInfoTableSRT topCAFEnv topSRT g
+ return (topSRT, gs : rst)
+ (topSRT, gs') <- runFuelIO (hsc_OptFuel hsc_env) $ foldM setSRT (topSRT, []) gs
+ return (topSRT, concat gs' : tops)
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