import CmmProcPoint
import CmmCallConv
import CmmCPSGen
-import CmmInfo
import CmmUtils
import ClosureInfo
import MachOp
-import ForeignCall
import CLabel
import SMRep
import Constants
-----------------------------------------------------------------------------
cmmCPS :: DynFlags -- ^ Dynamic flags: -dcmm-lint -ddump-cps-cmm
-> [GenCmm CmmStatic CmmInfo CmmStmt] -- ^ Input C-- with Proceedures
- -> IO [GenCmm CmmStatic [CmmStatic] CmmStmt] -- ^ Output CPS transformed C--
+ -> IO [GenCmm CmmStatic CmmInfo CmmStmt] -- ^ Output CPS transformed C--
cmmCPS dflags abstractC = do
when (dopt Opt_DoCmmLinting dflags) $
do showPass dflags "CmmLint"
return continuationC
-stg_gc_gen = mkRtsApFastLabel SLIT("gen_cg_TODO") --panic "Need the label for gc"
-make_gc_block block_id fun_label formals safety = BasicBlock block_id stmts
+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
- stmts = [CmmCall stg_gc_gen_target [] [] safety,
- CmmJump fun_expr actuals]
- stg_gc_gen_target =
- CmmForeignCall (CmmLit (CmmLabel stg_gc_gen)) CmmCallConv
- actuals = map (\x -> (CmmReg (CmmLocal x), NoHint)) formals
- fun_expr = CmmLit (CmmLabel fun_label)
-
-make_gc_check stack_use gc_block =
- [CmmCondBranch
- (CmmMachOp (MO_U_Lt $ cmmRegRep spReg)
- [CmmReg stack_use, CmmReg spLimReg])
- gc_block]
-
-force_gc_block old_info stack_use block_id fun_label formals =
- case old_info of
- CmmNonInfo (Just existing) -> (old_info, [], make_gc_check stack_use existing)
- CmmInfo _ (Just existing) _ _ -> (old_info, [], make_gc_check stack_use existing)
- CmmNonInfo Nothing
- -> (CmmNonInfo (Just block_id),
- [make_gc_block block_id fun_label formals (CmmSafe NoC_SRT)],
- make_gc_check stack_use block_id)
- CmmInfo prof Nothing type_tag type_info
- -> (CmmInfo prof (Just block_id) type_tag type_info,
- [make_gc_block block_id fun_label formals (CmmSafe srt)],
- make_gc_check stack_use block_id)
- where
- srt = case type_info of
- ConstrInfo _ _ _ -> NoC_SRT
- FunInfo _ srt' _ _ _ _ -> srt'
- ThunkInfo _ srt' -> srt'
- ThunkSelectorInfo _ srt' -> srt'
- ContInfo _ srt' -> srt'
+ 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 _ _
+ -> []
-----------------------------------------------------------------------------
-- |CPS a single CmmTop (proceedure)
cpsProc :: UniqSupply
-> GenCmmTop CmmStatic CmmInfo CmmStmt -- ^Input proceedure
- -> [GenCmmTop CmmStatic [CmmStatic] CmmStmt] -- ^Output proceedure and continuations
-cpsProc uniqSupply (CmmData sec dat) = [CmmData sec dat]
-cpsProc uniqSupply (CmmProc info ident params blocks) = info_procs
+ -> [GenCmmTop CmmStatic CmmInfo CmmStmt] -- ^Output proceedure and continuations
+
+-- 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 _ _ _ []) = [proc]
+
+-- CPS transform for those procs that actually need it
+cpsProc uniqSupply (CmmProc info ident params 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
- (gc_unique:stack_use_unique:info_uniques):adaptor_uniques:block_uniques = uniques
+ (stack_check_block_unique:stack_use_unique:info_uniques) :
+ adaptor_uniques :
+ block_uniques = uniques
proc_uniques = map (map uniqsFromSupply . listSplitUniqSupply) $ listSplitUniqSupply uniqSupply2
stack_use = CmmLocal (LocalReg stack_use_unique (cmmRegRep spReg) KindPtr)
+ 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)
- -- TODO: doc
- forced_gc :: (CmmInfo, [CmmBasicBlock], [CmmStmt])
- forced_gc = force_gc_block info stack_use (BlockId gc_unique) ident params
- (forced_info, gc_blocks, check_stmts) = forced_gc
+ forced_blocks = stack_check_block : blocks
- forced_blocks =
- case blocks of
- (BasicBlock id stmts) : bs ->
- (BasicBlock id (check_stmts ++ stmts)) : (bs ++ gc_blocks)
- [] -> [] -- If there is no code then we don't need a stack check
-
- forced_gc_id = case forced_info of
- CmmNonInfo (Just x) -> x
- CmmInfo _ (Just x) _ _ -> x
+ 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 [forced_gc_id])
+ zipWith3 (breakBlock (maybeToList maybe_gc_block_id))
block_uniques
forced_blocks
- (FunctionEntry forced_info ident params :
+ (FunctionEntry info ident params :
repeat ControlEntry)
f' = selectContinuations (fst broken_blocks)
-- Do a little meta-processing on the stack formats such as
-- getting the individual frame sizes and the maximum frame size
- formats' :: (WordOff, [(CLabel, ContinuationFormat)])
- formats' = processFormats formats continuations
+ 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 (snd formats')) continuations
+ continuations' = map (applyContinuationFormat format_list) continuations
-- Do the actual CPS transform.
cps_procs :: [CmmTop]
cps_procs = zipWith (continuationToProc formats' stack_use) proc_uniques continuations'
- -- Convert the info tables from CmmInfo to [CmmStatic]
- -- We might want to put this in another pass eventually
- info_procs :: [RawCmmTop]
- info_procs = concat (zipWith mkInfoTable info_uniques cps_procs)
-
-----------------------------------------------------------------------------
collectNonProcPointTargets ::
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 (panic "TODO") start
+ start_block = lookupWithDefaultUFM blocks unknown_block start
+ children_blocks = map (lookupWithDefaultUFM blocks unknown_block) (uniqSetToList children)
unknown_block = panic "unknown block in gatherBlocksIntoContinuation"
- children_blocks = map (lookupWithDefaultUFM blocks (panic "TODO")) (uniqSetToList children)
body = start_block : children_blocks
-- We can't properly annotate the continuation's stack parameters
info_table = case start_block_entry of
FunctionEntry info _ _ -> Right info
ContinuationEntry _ srt _ -> Left srt
- ControlEntry -> Right (CmmNonInfo Nothing)
+ ControlEntry -> Right (CmmInfo Nothing Nothing CmmNonInfoTable)
is_gc_cont = case start_block_entry of
FunctionEntry _ _ _ -> False
where
-- User written continuations
selectContinuationFormat' (Continuation
- (Right (CmmInfo _ _ _ (ContInfo format srt)))
+ (Right (CmmInfo _ _ (CmmInfoTable _ _ (ContInfo format srt))))
label formals _ _) =
(formals, Just label, format)
-- Either user written non-continuation code
unknown_block = panic "unknown BlockId in selectContinuationFormat"
processFormats :: [(CLabel, (CmmFormals, Maybe CLabel, [Maybe LocalReg]))]
+ -> Maybe UpdateFrame
-> [Continuation (Either C_SRT CmmInfo)]
- -> (WordOff, [(CLabel, ContinuationFormat)])
-processFormats formats continuations = (max_size, formats')
+ -> (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
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
-- User written continuations
applyContinuationFormat formats (Continuation
- (Right (CmmInfo prof gc tag (ContInfo _ srt)))
+ (Right (CmmInfo gc update_frame (CmmInfoTable prof tag (ContInfo _ srt))))
label formals is_gc blocks) =
- Continuation (CmmInfo prof gc tag (ContInfo format srt))
+ 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
-- CPS generated continuations
applyContinuationFormat formats (Continuation
(Left srt) label formals is_gc blocks) =
- Continuation (CmmInfo prof gc tag (ContInfo (continuation_stack $ format) srt))
+ 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
projects / ghc-hetmet.git / blobdiff