import CmmInfo
import CmmUtils
+import CgProf (curCCS, curCCSAddr)
+import CgUtils (cmmOffsetW)
import Bitmap
import ClosureInfo
import MachOp
import SMRep
import Constants
+import StaticFlags
import DynFlags
import ErrUtils
import Maybes
import IO
import Data.List
+import MachRegs (callerSaveVolatileRegs)
+ -- HACK: this is part of the NCG so we shouldn't use this, but we need
+ -- it for now to eliminate the need for saved regs to be in CmmCall.
+ -- The long term solution is to factor callerSaveVolatileRegs
+ -- from nativeGen into CPS
+
-----------------------------------------------------------------------------
-- |Top level driver for the CPS pass
-----------------------------------------------------------------------------
actuals = map (\x -> (CmmReg (CmmLocal x), NoHint)) formals
fun_expr = CmmLit (CmmLabel fun_label)
-force_gc_block old_info block_id fun_label formals blocks =
+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 _) -> (old_info, [])
- CmmInfo _ (Just _) _ _ -> (old_info, [])
+ 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_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)])
- where
- srt = case type_info of
- ConstrInfo _ _ _ -> NoC_SRT
- FunInfo _ srt' _ _ _ _ -> srt'
- ThunkInfo _ srt' -> srt'
- ThunkSelectorInfo _ srt' -> srt'
- ContInfo _ srt' -> srt'
+ -> (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'
-----------------------------------------------------------------------------
-- |CPS a single CmmTop (proceedure)
cpsProc uniqSupply (CmmData sec dat) = [CmmData sec dat]
cpsProc uniqSupply (CmmProc info ident params blocks) = info_procs
where
+ (uniqSupply1, uniqSupply2) = splitUniqSupply uniqSupply
uniques :: [[Unique]]
- uniques = map uniqsFromSupply $ listSplitUniqSupply uniqSupply
- (gc_unique:info_uniques):block_uniques = uniques
+ uniques = map uniqsFromSupply $ listSplitUniqSupply uniqSupply1
+ (gc_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)
- -- Ensure that
- forced_gc :: (CmmInfo, [CmmBasicBlock])
- forced_gc = force_gc_block info (BlockId gc_unique) ident params 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 =
+ 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_info = fst forced_gc
- forced_blocks = blocks ++ snd forced_gc
forced_gc_id = case forced_info of
CmmNonInfo (Just x) -> x
CmmInfo _ (Just x) _ _ -> x
-- Break the block at each function call.
-- The part after the function call will have to become a continuation.
- broken_blocks :: [BrokenBlock]
+ broken_blocks :: ([(BlockId, ContFormat)], [BrokenBlock])
broken_blocks =
- concat $ zipWith3 breakBlock block_uniques forced_blocks
- (FunctionEntry forced_info ident params:repeat ControlEntry)
+ (\x -> (concatMap fst x, concatMap snd x)) $
+ zipWith3 (breakBlock [forced_gc_id])
+ block_uniques
+ forced_blocks
+ (FunctionEntry forced_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.
--
-- 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
+ 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
+ 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
+ block_env = blocksToBlockEnv broken_blocks'
-- Group the blocks into continuations based on the set of proc-points.
continuations :: [Continuation (Either C_SRT CmmInfo)]
continuations = zipWith
- (gatherBlocksIntoContinuation proc_points block_env)
+ (gatherBlocksIntoContinuation live proc_points block_env)
(uniqSetToList proc_points)
- (Just forced_gc_id : repeat Nothing)
+ (Just forced_gc_id : repeat Nothing) {-dead-}
-- 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
- (Maybe CLabel, -- label in top slot
+ (CmmFormals, -- arguments
+ Maybe CLabel, -- label in top slot
[Maybe LocalReg]))] -- slots
- formats = selectStackFormat live continuations
+ 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, [(CLabel, StackFormat)])
+ formats' :: (WordOff, [(CLabel, ContinuationFormat)])
formats' = processFormats formats continuations
-- Update the info table data on the continuations with
-- the selected stack formats.
continuations' :: [Continuation CmmInfo]
- continuations' = map (applyStackFormat (snd formats')) continuations
+ continuations' = map (applyContinuationFormat (snd formats')) continuations
-- Do the actual CPS transform.
cps_procs :: [CmmTop]
- cps_procs = map (continuationToProc formats') continuations'
+ 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
-- and heap memory (not sure if that's usefull at all though, but it may
-- be worth exploring the design space).
-continuationLabel (Continuation _ l _ _) = l
+continuationLabel (Continuation _ l _ _ _) = l
data Continuation info =
Continuation
info -- Left <=> Continuation created by the CPS
-- Right <=> Function or Proc point
CLabel -- Used to generate both info & entry labels
CmmFormals -- Argument locals live on entry (C-- procedure params)
+ Bool -- ^ True <=> GC block so ignore stack size
[BrokenBlock] -- Code, may be empty. The first block is
-- the entry point. The order is otherwise initially
-- unimportant, but at some point the code gen will
-- to a label. To jump to the first block in a Proc,
-- use the appropriate CLabel.
-data StackFormat
- = StackFormat {
- stack_label :: Maybe CLabel, -- The label occupying the top slot
- stack_frame_size :: WordOff, -- Total frame size in words (not including arguments)
- stack_live :: [Maybe LocalReg] -- local reg offsets from stack top
+data ContinuationFormat
+ = ContinuationFormat {
+ continuation_formals :: CmmFormals,
+ continuation_label :: Maybe CLabel, -- The label occupying the top slot
+ continuation_frame_size :: WordOff, -- Total frame size in words (not including arguments)
+ continuation_stack :: [Maybe LocalReg] -- local reg offsets from stack top
}
-- A block can be a continuation of a call
-- * Proc points might get some live variables passed as arguments
gatherBlocksIntoContinuation ::
- UniqSet BlockId -> BlockEnv BrokenBlock
+ BlockEntryLiveness -> UniqSet BlockId -> BlockEnv BrokenBlock
-> BlockId -> Maybe BlockId -> Continuation (Either C_SRT CmmInfo)
-gatherBlocksIntoContinuation proc_points blocks start gc =
- Continuation info_table clabel params body
+gatherBlocksIntoContinuation live proc_points blocks start gc =
+ Continuation info_table clabel params is_gc_cont body
where
- start_and_gc = start : maybeToList gc
- children = (collectNonProcPointTargets proc_points blocks (mkUniqSet start_and_gc) start_and_gc) `minusUniqSet` (mkUniqSet start_and_gc)
+ --start_and_gc = [start] -- : maybeToList gc
+ --children = (collectNonProcPointTargets proc_points blocks (mkUniqSet start_and_gc) start_and_gc) `minusUniqSet` (mkUniqSet start_and_gc)
+ children = (collectNonProcPointTargets proc_points blocks (unitUniqSet start) [start]) `minusUniqSet` (unitUniqSet start)
start_block = lookupWithDefaultUFM blocks (panic "TODO") start
- gc_block = map (lookupWithDefaultUFM blocks (panic "TODO)")) (maybeToList gc)
+ unknown_block = panic "unknown block in gatherBlocksIntoContinuation"
+ --gc_block = map (lookupWithDefaultUFM blocks (panic "TODO)"))
+ -- (maybeToList gc)
children_blocks = map (lookupWithDefaultUFM blocks (panic "TODO")) (uniqSetToList children)
- body = start_block : gc_block ++ children_blocks
+ body = start_block : {-gc_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
+ ContinuationEntry _ srt _ -> Left srt
ControlEntry -> Right (CmmNonInfo Nothing)
+ 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 -> [] -- TODO: it's a proc-point, we could pass lives in parameter registers
+ 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
-selectStackFormat :: BlockEnv CmmLive
+selectContinuationFormat :: BlockEnv CmmLive
-> [Continuation (Either C_SRT CmmInfo)]
- -> [(CLabel, (Maybe CLabel, [Maybe LocalReg]))]
-selectStackFormat live continuations =
- map (\c -> (continuationLabel c, selectStackFormat' c)) continuations
+ -> [(CLabel, (CmmFormals, Maybe CLabel, [Maybe LocalReg]))]
+selectContinuationFormat live continuations =
+ map (\c -> (continuationLabel c, selectContinuationFormat' c)) continuations
where
- selectStackFormat' (Continuation
+ -- User written continuations
+ selectContinuationFormat' (Continuation
(Right (CmmInfo _ _ _ (ContInfo format srt)))
- label _ _) = (Just label, format)
- selectStackFormat' (Continuation (Right _) _ _ _) = (Nothing, [])
- selectStackFormat' (Continuation (Left srt) label _ blocks) =
+ 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 (Just label,
+ in (formals,
+ Just label,
map Just $ uniqSetToList $
lookupWithDefaultUFM live unknown_block ident)
- unknown_block = panic "unknown BlockId in selectStackFormat"
+ unknown_block = panic "unknown BlockId in selectContinuationFormat"
-processFormats :: [(CLabel, (Maybe CLabel, [Maybe LocalReg]))]
+processFormats :: [(CLabel, (CmmFormals, Maybe CLabel, [Maybe LocalReg]))]
-> [Continuation (Either C_SRT CmmInfo)]
- -> (WordOff, [(CLabel, StackFormat)])
+ -> (WordOff, [(CLabel, ContinuationFormat)])
processFormats formats continuations = (max_size, formats')
where
max_size = maximum $
0 : map (continuationMaxStack formats') continuations
formats' = map make_format formats
- make_format (label, format) =
+ make_format (label, (formals, top, stack)) =
(label,
- StackFormat {
- stack_label = fst format,
- stack_frame_size = stack_size (snd format) +
- if isJust (fst format)
+ ContinuationFormat {
+ continuation_formals = formals,
+ continuation_label = top,
+ continuation_frame_size = stack_size stack +
+ if isJust top
then label_size
else 0,
- stack_live = snd format })
+ continuation_stack = stack })
-- TODO: get rid of "+ 1" etc.
label_size = 1 :: WordOff
width = machRepByteWidth (localRegRep reg) `quot` wORD_SIZE
-- TODO: it would be better if we had a machRepWordWidth
-continuationMaxStack :: [(CLabel, StackFormat)]
+continuationMaxStack :: [(CLabel, ContinuationFormat)]
-> Continuation a
-> WordOff
-continuationMaxStack formats (Continuation _ label _ blocks) =
- max_arg_size + stack_frame_size stack_format
+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"
argumentsSize (cmmExprRep . fst) args
final_arg_size (FinalJump _ args) =
argumentsSize (cmmExprRep . fst) args
- final_arg_size (FinalCall next _ _ 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 . fst) args +
- stack_frame_size next_format
+ continuation_frame_size next_format
where
next_format = maybe unknown_format id $ lookup next' formats
next' = mkReturnPtLabel $ getUnique next
stmt_arg_size _ = 0
-----------------------------------------------------------------------------
-applyStackFormat :: [(CLabel, StackFormat)]
+applyContinuationFormat :: [(CLabel, ContinuationFormat)]
-> Continuation (Either C_SRT CmmInfo)
-> Continuation CmmInfo
-- User written continuations
-applyStackFormat formats (Continuation
+applyContinuationFormat formats (Continuation
(Right (CmmInfo prof gc tag (ContInfo _ srt)))
- label formals blocks) =
+ label formals is_gc blocks) =
Continuation (CmmInfo prof gc tag (ContInfo format srt))
- label formals blocks
+ label formals is_gc blocks
where
- format = stack_live $ maybe unknown_block id $ lookup label formats
- unknown_block = panic "unknown BlockId in applyStackFormat"
+ format = continuation_stack $ maybe unknown_block id $ lookup label formats
+ unknown_block = panic "unknown BlockId in applyContinuationFormat"
--- User written non-continuation code
-applyStackFormat formats (Continuation (Right info) label formals blocks) =
- Continuation info label formals blocks
+-- 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
-applyStackFormat formats (Continuation (Left srt) label formals blocks) =
- Continuation (CmmInfo prof gc tag (ContInfo (stack_live $ format) srt))
- label formals blocks
+applyContinuationFormat formats (Continuation
+ (Left srt) label formals is_gc blocks) =
+ Continuation (CmmInfo prof gc 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
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 applyStackFormat"
+ unknown_block = panic "unknown BlockId in applyContinuationFormat"
-----------------------------------------------------------------------------
-continuationToProc :: (WordOff, [(CLabel, StackFormat)])
+continuationToProc :: (WordOff, [(CLabel, ContinuationFormat)])
+ -> CmmReg
+ -> [[Unique]]
-> Continuation CmmInfo
-> CmmTop
-continuationToProc (max_stack, formats)
- (Continuation info label formals blocks) =
- CmmProc info label formals (map continuationToProc' blocks)
+continuationToProc (max_stack, formats) stack_use uniques
+ (Continuation info label formals _ blocks) =
+ CmmProc info label formals (concat $ zipWith3 continuationToProc' uniques blocks (True : repeat False))
where
curr_format = maybe unknown_block id $ lookup label formats
unknown_block = panic "unknown BlockId in continuationToProc"
-
- continuationToProc' :: BrokenBlock -> CmmBasicBlock
- continuationToProc' (BrokenBlock ident entry stmts _ exit) =
- BasicBlock ident (prefix++stmts++postfix)
+ curr_stack = continuation_frame_size curr_format
+ arg_stack = argumentsSize localRegRep formals
+
+ param_stmts :: [CmmStmt]
+ param_stmts = function_entry curr_format
+
+ gc_stmts :: [CmmStmt]
+ gc_stmts =
+ case info of
+ CmmInfo _ (Just gc_block) _ _ ->
+ gc_stack_check' stack_use arg_stack (max_stack - curr_stack)
+ CmmInfo _ Nothing _ _ ->
+ panic "continuationToProc: missing GC block"
+ CmmNonInfo (Just gc_block) ->
+ gc_stack_check' stack_use arg_stack (max_stack - curr_stack)
+ CmmNonInfo Nothing ->
+ panic "continuationToProc: missing non-info GC block"
+
+-- At present neither the Cmm parser nor the code generator
+-- produce code that will allow the target of a CmmCondBranch
+-- or a CmmSwitch to become a continuation or a proc-point.
+-- If future revisions, might allow these to happen
+-- then special care will have to be take to allow for that case.
+ continuationToProc' :: [Unique]
+ -> BrokenBlock
+ -> Bool
+ -> [CmmBasicBlock]
+ continuationToProc' uniques (BrokenBlock ident entry stmts _ exit) is_entry =
+ prefix_blocks ++ [main_block]
where
- prefix = case entry of
+ prefix_blocks =
+ case gc_prefix ++ param_prefix of
+ [] -> []
+ entry_stmts -> [BasicBlock prefix_id
+ (entry_stmts ++ [CmmBranch ident])]
+
+ prefix_unique : call_uniques = uniques
+ toCLabel = mkReturnPtLabel . getUnique
+
+ block_for_branch unique next
+ | (Just cont_format) <- lookup (toCLabel next) formats
+ = let
+ new_next = BlockId unique
+ cont_stack = continuation_frame_size cont_format
+ arguments = map formal_to_actual (continuation_formals cont_format)
+ in (new_next,
+ [BasicBlock new_next $
+ pack_continuation False curr_format cont_format ++
+ tail_call (curr_stack - cont_stack)
+ (CmmLit $ CmmLabel $ toCLabel next)
+ arguments])
+ | otherwise
+ = (next, [])
+
+ block_for_branch' :: Unique -> Maybe BlockId -> (Maybe BlockId, [CmmBasicBlock])
+ block_for_branch' _ Nothing = (Nothing, [])
+ block_for_branch' unique (Just next) = (Just new_next, new_blocks)
+ where (new_next, new_blocks) = block_for_branch unique next
+
+ main_block = BasicBlock ident (stmts ++ postfix_stmts)
+ prefix_id = BlockId prefix_unique
+ gc_prefix = case entry of
+ FunctionEntry _ _ _ -> gc_stmts
ControlEntry -> []
- FunctionEntry (CmmInfo _ (Just gc_block) _ _) _ formals ->
- gc_stack_check gc_block max_stack ++
- function_entry formals curr_format
- FunctionEntry (CmmInfo _ Nothing _ _) _ formals ->
- panic "continuationToProc: missing GC block"
- FunctionEntry (CmmNonInfo (Just gc_block)) _ formals ->
- gc_stack_check gc_block max_stack ++
- function_entry formals curr_format
- FunctionEntry (CmmNonInfo Nothing) _ formals ->
- panic "continuationToProc: missing non-info GC block"
- ContinuationEntry formals _ ->
- function_entry formals curr_format
- postfix = case exit of
- FinalBranch next -> [CmmBranch next]
+ ContinuationEntry _ _ _ -> []
+ param_prefix = if is_entry
+ then param_stmts
+ else []
+ postfix_stmts = case exit of
+ FinalBranch next ->
+ if (mkReturnPtLabel $ getUnique next) == label
+ then [CmmBranch next]
+ else case lookup (mkReturnPtLabel $ getUnique next) formats of
+ Nothing -> [CmmBranch next]
+ Just cont_format ->
+ pack_continuation False curr_format cont_format ++
+ tail_call (curr_stack - cont_stack)
+ (CmmLit $ CmmLabel $ mkReturnPtLabel $ getUnique next)
+ arguments
+ where
+ cont_stack = continuation_frame_size cont_format
+ arguments = map formal_to_actual (continuation_formals cont_format)
FinalSwitch expr targets -> [CmmSwitch expr targets]
FinalReturn arguments ->
- tail_call (stack_frame_size curr_format)
+ tail_call curr_stack
(CmmLoad (CmmReg spReg) wordRep)
arguments
FinalJump target arguments ->
- tail_call (stack_frame_size curr_format) target arguments
+ tail_call curr_stack target arguments
+
+ -- A regular Cmm function call
FinalCall next (CmmForeignCall target CmmCallConv)
- results arguments ->
- pack_continuation curr_format cont_format ++
- tail_call (stack_frame_size curr_format - stack_frame_size cont_format)
+ results arguments _ _ ->
+ pack_continuation True curr_format cont_format ++
+ tail_call (curr_stack - cont_stack)
target arguments
where
cont_format = maybe unknown_block id $
lookup (mkReturnPtLabel $ getUnique next) formats
- FinalCall next _ results arguments -> panic "unimplemented CmmCall"
+ cont_stack = continuation_frame_size cont_format
+
+ -- A safe foreign call
+ FinalCall next (CmmForeignCall target conv)
+ results arguments _ _ ->
+ target_stmts ++
+ foreignCall call_uniques' (CmmForeignCall new_target conv)
+ results arguments
+ where
+ (call_uniques', target_stmts, new_target) =
+ maybeAssignTemp call_uniques target
+
+ -- A safe prim call
+ FinalCall next (CmmPrim target)
+ results arguments _ _ ->
+ foreignCall call_uniques (CmmPrim target)
+ results arguments
+
+formal_to_actual reg = (CmmReg (CmmLocal reg), NoHint)
+
+foreignCall :: [Unique] -> CmmCallTarget -> CmmHintFormals -> CmmActuals -> [CmmStmt]
+foreignCall uniques call results arguments =
+ arg_stmts ++
+ saveThreadState ++
+ caller_save ++
+ [CmmCall (CmmForeignCall suspendThread CCallConv)
+ [ (id,PtrHint) ]
+ [ (CmmReg (CmmGlobal BaseReg), PtrHint) ]
+ CmmUnsafe,
+ CmmCall call results new_args CmmUnsafe,
+ CmmCall (CmmForeignCall resumeThread CCallConv)
+ [ (new_base, PtrHint) ]
+ [ (CmmReg (CmmLocal id), PtrHint) ]
+ CmmUnsafe,
+ -- Assign the result to BaseReg: we
+ -- might now have a different Capability!
+ CmmAssign (CmmGlobal BaseReg) (CmmReg (CmmLocal new_base))] ++
+ caller_load ++
+ loadThreadState tso_unique ++
+ [CmmJump (CmmReg spReg) (map (formal_to_actual . fst) results)]
+ where
+ (_, arg_stmts, new_args) =
+ loadArgsIntoTemps argument_uniques arguments
+ (caller_save, caller_load) =
+ callerSaveVolatileRegs (Just [{-only system regs-}])
+ new_base = LocalReg base_unique (cmmRegRep (CmmGlobal BaseReg)) KindNonPtr
+ id = LocalReg id_unique wordRep KindNonPtr
+ tso_unique : base_unique : id_unique : argument_uniques = uniques
+
+-- -----------------------------------------------------------------------------
+-- Save/restore the thread state in the TSO
+
+suspendThread = CmmLit (CmmLabel (mkRtsCodeLabel SLIT("suspendThread")))
+resumeThread = CmmLit (CmmLabel (mkRtsCodeLabel SLIT("resumeThread")))
+
+-- This stuff can't be done in suspendThread/resumeThread, because it
+-- refers to global registers which aren't available in the C world.
+
+saveThreadState =
+ -- CurrentTSO->sp = Sp;
+ [CmmStore (cmmOffset stgCurrentTSO tso_SP) stgSp,
+ closeNursery] ++
+ -- and save the current cost centre stack in the TSO when profiling:
+ if opt_SccProfilingOn
+ then [CmmStore (cmmOffset stgCurrentTSO tso_CCCS) curCCS]
+ else []
+
+ -- CurrentNursery->free = Hp+1;
+closeNursery = CmmStore nursery_bdescr_free (cmmOffsetW stgHp 1)
+
+loadThreadState tso_unique =
+ [
+ -- tso = CurrentTSO;
+ CmmAssign (CmmLocal tso) stgCurrentTSO,
+ -- Sp = tso->sp;
+ CmmAssign sp (CmmLoad (cmmOffset (CmmReg (CmmLocal tso)) tso_SP)
+ wordRep),
+ -- SpLim = tso->stack + RESERVED_STACK_WORDS;
+ CmmAssign spLim (cmmOffsetW (cmmOffset (CmmReg (CmmLocal tso)) tso_STACK)
+ rESERVED_STACK_WORDS)
+ ] ++
+ openNursery ++
+ -- and load the current cost centre stack from the TSO when profiling:
+ if opt_SccProfilingOn
+ then [CmmStore curCCSAddr
+ (CmmLoad (cmmOffset (CmmReg (CmmLocal tso)) tso_CCCS) wordRep)]
+ else []
+ where tso = LocalReg tso_unique wordRep KindNonPtr -- TODO FIXME NOW
+
+
+openNursery = [
+ -- Hp = CurrentNursery->free - 1;
+ CmmAssign hp (cmmOffsetW (CmmLoad nursery_bdescr_free wordRep) (-1)),
+
+ -- HpLim = CurrentNursery->start +
+ -- CurrentNursery->blocks*BLOCK_SIZE_W - 1;
+ CmmAssign hpLim
+ (cmmOffsetExpr
+ (CmmLoad nursery_bdescr_start wordRep)
+ (cmmOffset
+ (CmmMachOp mo_wordMul [
+ CmmMachOp (MO_S_Conv I32 wordRep)
+ [CmmLoad nursery_bdescr_blocks I32],
+ CmmLit (mkIntCLit bLOCK_SIZE)
+ ])
+ (-1)
+ )
+ )
+ ]
+
+
+nursery_bdescr_free = cmmOffset stgCurrentNursery oFFSET_bdescr_free
+nursery_bdescr_start = cmmOffset stgCurrentNursery oFFSET_bdescr_start
+nursery_bdescr_blocks = cmmOffset stgCurrentNursery oFFSET_bdescr_blocks
+
+tso_SP = tsoFieldB oFFSET_StgTSO_sp
+tso_STACK = tsoFieldB oFFSET_StgTSO_stack
+tso_CCCS = tsoProfFieldB oFFSET_StgTSO_CCCS
+
+-- The TSO struct has a variable header, and an optional StgTSOProfInfo in
+-- the middle. The fields we're interested in are after the StgTSOProfInfo.
+tsoFieldB :: ByteOff -> ByteOff
+tsoFieldB off
+ | opt_SccProfilingOn = off + sIZEOF_StgTSOProfInfo + fixedHdrSize * wORD_SIZE
+ | otherwise = off + fixedHdrSize * wORD_SIZE
+
+tsoProfFieldB :: ByteOff -> ByteOff
+tsoProfFieldB off = off + fixedHdrSize * wORD_SIZE
+
+stgSp = CmmReg sp
+stgHp = CmmReg hp
+stgCurrentTSO = CmmReg currentTSO
+stgCurrentNursery = CmmReg currentNursery
+
+sp = CmmGlobal Sp
+spLim = CmmGlobal SpLim
+hp = CmmGlobal Hp
+hpLim = CmmGlobal HpLim
+currentTSO = CmmGlobal CurrentTSO
+currentNursery = CmmGlobal CurrentNursery
-----------------------------------------------------------------------------
-- Functions that generate CmmStmt sequences
argument_formats = assignArguments (cmmExprRep . fst) arguments
+gc_stack_check' stack_use arg_stack max_frame_size =
+ if max_frame_size > arg_stack
+ then [CmmAssign stack_use (CmmRegOff spReg (-max_frame_size*wORD_SIZE))]
+ else [CmmAssign stack_use (CmmReg spLimReg)]
+ -- Trick the optimizer into eliminating the branch for us
+
gc_stack_check :: BlockId -> WordOff -> [CmmStmt]
gc_stack_check gc_block max_frame_size
= check_stack_limit where
CmmReg spLimReg])
gc_block]
+
-- TODO: fix branches to proc point
-- (we have to insert a new block to marshel the continuation)
-pack_continuation :: StackFormat -> StackFormat -> [CmmStmt]
-pack_continuation (StackFormat curr_id curr_frame_size _)
- (StackFormat cont_id cont_frame_size live_regs)
+
+
+pack_continuation :: Bool -- ^ Whether to set the top/header
+ -- of the stack. We only need to
+ -- set it if we are calling down
+ -- as opposed to continuation
+ -- adaptors.
+ -> ContinuationFormat -- ^ The current format
+ -> ContinuationFormat -- ^ The return point format
+ -> [CmmStmt]
+pack_continuation allow_header_set
+ (ContinuationFormat _ curr_id curr_frame_size _)
+ (ContinuationFormat _ cont_id cont_frame_size live_regs)
= store_live_values ++ set_stack_header where
-- TODO: only save variables when actually needed
-- (may be handled by latter pass)
[stack_put spRel (CmmReg (CmmLocal reg)) offset
| (reg, offset) <- cont_offsets]
set_stack_header =
- if needs_header_set
+ if needs_header_set && allow_header_set
then [stack_put spRel continuation_function 0]
else []
-- that could branch to eachother (i.e. control blocks)
-- have the same stack format (this causes a problem
-- only for proc-point).
-function_entry :: CmmFormals -> StackFormat -> [CmmStmt]
-function_entry formals (StackFormat _ _ live_regs)
+function_entry :: ContinuationFormat -> [CmmStmt]
+function_entry (ContinuationFormat formals _ _ live_regs)
= load_live_values ++ load_args where
-- TODO: only save variables when actually needed
-- (may be handled by latter pass)
projects / ghc-hetmet.git / blobdiff