{-# 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 CmmInfo ( cmmToRawCmm, mkInfoTable ) where #include "HsVersions.h" import Cmm import CmmUtils import CLabel import Bitmap import ClosureInfo import CgInfoTbls import CgCallConv import CgUtils import SMRep import Constants import Outputable import StaticFlags import Unique import UniqSupply import Panic import Data.Bits cmmToRawCmm :: [Cmm] -> IO [RawCmm] cmmToRawCmm cmm = do info_tbl_uniques <- mkSplitUniqSupply 'i' return $ zipWith raw_cmm (listSplitUniqSupply info_tbl_uniques) cmm where raw_cmm uniq_supply (Cmm procs) = Cmm $ concat $ zipWith mkInfoTable (uniqsFromSupply uniq_supply) procs -- Make a concrete info table, represented as a list of CmmStatic -- (it can't be simply a list of Word, because the SRT field is -- represented by a label+offset expression). -- -- With tablesNextToCode, the layout is -- -- -- -- -- Without tablesNextToCode, the layout of an info table is -- -- -- -- -- See includes/InfoTables.h -- -- For return-points these are as follows -- -- Tables next to code: -- -- -- -- ret-addr --> -- -- Not tables-next-to-code: -- -- ret-addr --> -- -- -- -- * The SRT slot is only there if there is SRT info to record mkInfoTable :: Unique -> CmmTop -> [RawCmmTop] mkInfoTable uniq (CmmData sec dat) = [CmmData sec dat] mkInfoTable uniq (CmmProc (CmmInfo _ _ info) entry_label arguments blocks) = case info of -- Code without an info table. Easy. CmmNonInfoTable -> [CmmProc [] entry_label arguments blocks] CmmInfoTable (ProfilingInfo ty_prof cl_prof) type_tag type_info -> let info_label = entryLblToInfoLbl entry_label ty_prof' = makeRelativeRefTo info_label ty_prof cl_prof' = makeRelativeRefTo info_label cl_prof in case type_info of -- A function entry point. FunInfo (ptrs, nptrs) srt fun_arity pap_bitmap slow_entry -> mkInfoTableAndCode info_label std_info fun_extra_bits entry_label arguments blocks where fun_type = argDescrType pap_bitmap fun_extra_bits = [packHalfWordsCLit fun_type fun_arity] ++ case pap_bitmap of ArgGen liveness -> (if null srt_label then [mkIntCLit 0] else srt_label) ++ [makeRelativeRefTo info_label $ mkLivenessCLit liveness, makeRelativeRefTo info_label slow_entry] _ -> srt_label std_info = mkStdInfoTable ty_prof' cl_prof' type_tag srt_bitmap layout (srt_label, srt_bitmap) = mkSRTLit info_label srt layout = packHalfWordsCLit ptrs nptrs -- A constructor. ConstrInfo (ptrs, nptrs) con_tag descr -> mkInfoTableAndCode info_label std_info [con_name] entry_label arguments blocks where std_info = mkStdInfoTable ty_prof' cl_prof' type_tag con_tag layout con_name = makeRelativeRefTo info_label descr layout = packHalfWordsCLit ptrs nptrs -- A thunk. ThunkInfo (ptrs, nptrs) srt -> mkInfoTableAndCode info_label std_info srt_label entry_label arguments blocks where std_info = mkStdInfoTable ty_prof' cl_prof' type_tag srt_bitmap layout (srt_label, srt_bitmap) = mkSRTLit info_label srt layout = packHalfWordsCLit ptrs nptrs -- A selector thunk. ThunkSelectorInfo offset srt -> mkInfoTableAndCode info_label std_info [{- no SRT -}] entry_label arguments blocks where std_info = mkStdInfoTable ty_prof' cl_prof' type_tag 0 (mkWordCLit offset) -- A continuation/return-point. ContInfo stack_layout srt -> liveness_data ++ mkInfoTableAndCode info_label std_info srt_label entry_label arguments blocks where std_info = mkStdInfoTable ty_prof' cl_prof' maybe_big_type_tag srt_bitmap (makeRelativeRefTo info_label liveness_lit) (liveness_lit, liveness_data, liveness_tag) = mkLiveness uniq stack_layout maybe_big_type_tag = if type_tag == rET_SMALL then liveness_tag else type_tag (srt_label, srt_bitmap) = mkSRTLit info_label srt -- Handle the differences between tables-next-to-code -- and not tables-next-to-code mkInfoTableAndCode :: CLabel -> [CmmLit] -> [CmmLit] -> CLabel -> CmmFormals -> ListGraph CmmStmt -> [RawCmmTop] mkInfoTableAndCode info_lbl std_info extra_bits entry_lbl args blocks | tablesNextToCode -- Reverse the extra_bits; and emit the top-level proc = [CmmProc (map CmmStaticLit (reverse extra_bits ++ std_info)) entry_lbl args blocks] | ListGraph [] <- blocks -- No code; only the info table is significant = -- Use a zero place-holder in place of the -- entry-label in the info table [mkRODataLits info_lbl (zeroCLit : std_info ++ extra_bits)] | otherwise -- Separately emit info table (with the function entry = -- point as first entry) and the entry code [CmmProc [] entry_lbl args blocks, mkDataLits info_lbl (CmmLabel entry_lbl : std_info ++ extra_bits)] mkSRTLit :: CLabel -> C_SRT -> ([CmmLit], -- srt_label StgHalfWord) -- srt_bitmap mkSRTLit info_label NoC_SRT = ([], 0) mkSRTLit info_label (C_SRT lbl off bitmap) = ([makeRelativeRefTo info_label (cmmLabelOffW lbl off)], bitmap) ------------------------------------------------------------------------- -- -- Build a liveness mask for the stack layout -- ------------------------------------------------------------------------- -- There are four kinds of things on the stack: -- -- - pointer variables (bound in the environment) -- - non-pointer variables (bound in the environment) -- - free slots (recorded in the stack free list) -- - non-pointer data slots (recorded in the stack free list) -- -- The first two are represented with a 'Just' of a 'LocalReg'. -- The last two with one or more 'Nothing' constructors. -- Each 'Nothing' represents one used word. -- -- The head of the stack layout is the top of the stack and -- the least-significant bit. -- TODO: refactor to use utility functions -- TODO: combine with CgCallConv.mkLiveness (see comment there) mkLiveness :: Unique -> [Maybe LocalReg] -> (CmmLit, [RawCmmTop], ClosureTypeTag) -- ^ Returns: -- 1. The bitmap (literal value or label) -- 2. Large bitmap CmmData if needed -- 3. rET_SMALL or rET_BIG mkLiveness uniq live = if length bits > mAX_SMALL_BITMAP_SIZE -- does not fit in one word then (CmmLabel big_liveness, [data_lits], rET_BIG) -- fits in one word else (mkWordCLit small_liveness, [], rET_SMALL) where mkBits [] = [] mkBits (reg:regs) = take sizeW bits ++ mkBits regs where sizeW = case reg of Nothing -> 1 Just r -> (widthInBytes (typeWidth (localRegType r)) + wORD_SIZE - 1) `quot` wORD_SIZE -- number of words, rounded up bits = repeat $ is_non_ptr reg -- True <=> Non Ptr is_non_ptr Nothing = True is_non_ptr (Just reg) = not $ isGcPtrType (localRegType reg) bits :: [Bool] bits = mkBits live bitmap :: Bitmap bitmap = mkBitmap bits small_bitmap = case bitmap of [] -> 0 [b] -> fromIntegral b _ -> panic "mkLiveness" small_liveness = fromIntegral (length bits) .|. (small_bitmap `shiftL` bITMAP_BITS_SHIFT) big_liveness = mkBitmapLabel uniq lits = mkWordCLit (fromIntegral (length bits)) : map mkWordCLit bitmap data_lits = mkRODataLits big_liveness lits ------------------------------------------------------------------------- -- -- Generating a standard info table -- ------------------------------------------------------------------------- -- The standard bits of an info table. This part of the info table -- corresponds to the StgInfoTable type defined in InfoTables.h. -- -- Its shape varies with ticky/profiling/tables next to code etc -- so we can't use constant offsets from Constants mkStdInfoTable :: CmmLit -- closure type descr (profiling) -> CmmLit -- closure descr (profiling) -> StgHalfWord -- closure type -> StgHalfWord -- SRT length -> CmmLit -- layout field -> [CmmLit] mkStdInfoTable type_descr closure_descr cl_type srt_len layout_lit = -- Parallel revertible-black hole field prof_info -- Ticky info (none at present) -- Debug info (none at present) ++ [layout_lit, type_lit] where prof_info | opt_SccProfilingOn = [type_descr, closure_descr] | otherwise = [] type_lit = packHalfWordsCLit cl_type srt_len