module CmmInfo (
- mkInfoTable
+ emptyContInfoTable,
+ cmmToRawCmm,
+ mkInfoTable,
) where
#include "HsVersions.h"
-import Cmm
+import OldCmm
import CmmUtils
import CLabel
import CgInfoTbls
import CgCallConv
import CgUtils
+import SMRep
import Constants
+import Panic
import StaticFlags
import Unique
-import Panic
+import UniqSupply
import Data.Bits
+-- When we split at proc points, we need an empty info table.
+emptyContInfoTable :: CmmInfoTable
+emptyContInfoTable = CmmInfoTable False (ProfilingInfo zero zero) rET_SMALL
+ (ContInfo [] NoC_SRT)
+ where zero = CmmInt 0 wordWidth
+
+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
+-- <reversed variable part>
+-- <normal forward StgInfoTable, but without
+-- an entry point at the front>
+-- <code>
+--
+-- Without tablesNextToCode, the layout of an info table is
+-- <entry label>
+-- <normal forward rest of StgInfoTable>
+-- <forward variable part>
+--
+-- See includes/rts/storage/InfoTables.h
+--
+-- For return-points these are as follows
+--
+-- Tables next to code:
+--
+-- <srt slot>
+-- <standard info table>
+-- ret-addr --> <entry code (if any)>
+--
+-- Not tables-next-to-code:
+--
+-- ret-addr --> <ptr to entry code>
+-- <standard info table>
+-- <srt slot>
+--
+-- * 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 info entry_label arguments blocks) =
+mkInfoTable _ (CmmData sec dat) = [CmmData sec dat]
+mkInfoTable uniq (CmmProc (CmmInfo _ _ info) entry_label blocks) =
case info of
- CmmNonInfo _ -> [CmmProc [] entry_label arguments blocks]
- CmmInfo (ProfilingInfo ty_prof cl_prof) _ type_tag
- (FunInfo (ptrs, nptrs) srt fun_type fun_arity pap_bitmap slow_entry) ->
- mkInfoTableAndCode info_label std_info fun_extra_bits entry_label arguments blocks
- where
- fun_extra_bits =
- [packHalfWordsCLit fun_type fun_arity] ++
- srt_label ++
- case pap_bitmap of
+ -- Code without an info table. Easy.
+ CmmNonInfoTable -> [CmmProc [] entry_label 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
+ 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 (CmmLabel slow_entry)]
- _ -> []
- std_info = mkStdInfoTable ty_prof cl_prof type_tag srt_bitmap layout
- info_label = entryLblToInfoLbl entry_label
- (srt_label, srt_bitmap) =
- case srt of
- NoC_SRT -> ([], 0)
- (C_SRT lbl off bitmap) ->
- ([makeRelativeRefTo info_label (cmmLabelOffW lbl off)],
- bitmap)
- layout = packHalfWordsCLit ptrs nptrs
-
- CmmInfo (ProfilingInfo ty_prof cl_prof) _ type_tag
- (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
- info_label = entryLblToInfoLbl entry_label
- con_name = makeRelativeRefTo info_label descr
- layout = packHalfWordsCLit ptrs nptrs
-
- CmmInfo (ProfilingInfo ty_prof cl_prof) _ type_tag
- (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
- info_label = entryLblToInfoLbl entry_label
- (srt_label, srt_bitmap) =
- case srt of
- NoC_SRT -> ([], 0)
- (C_SRT lbl off bitmap) ->
- ([makeRelativeRefTo info_label (cmmLabelOffW lbl off)],
- bitmap)
- layout = packHalfWordsCLit ptrs nptrs
-
- CmmInfo (ProfilingInfo ty_prof cl_prof) _ type_tag
- (ThunkSelectorInfo offset srt) ->
- mkInfoTableAndCode info_label std_info srt_label entry_label arguments blocks
- where
- std_info = mkStdInfoTable ty_prof cl_prof type_tag srt_bitmap (mkWordCLit offset)
- info_label = entryLblToInfoLbl entry_label
- (srt_label, srt_bitmap) =
- case srt of
- NoC_SRT -> ([], 0)
- (C_SRT lbl off bitmap) ->
- ([makeRelativeRefTo info_label (cmmLabelOffW lbl off)],
- bitmap)
-
- CmmInfo (ProfilingInfo ty_prof cl_prof) _ type_tag (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 type_tag srt_bitmap liveness_lit
- info_label = entryLblToInfoLbl entry_label
- (liveness_lit, liveness_data) = mkLiveness uniq stack_layout
- (srt_label, srt_bitmap) =
- case srt of
- NoC_SRT -> ([], 0)
- (C_SRT lbl off bitmap) ->
- ([makeRelativeRefTo info_label (cmmLabelOffW lbl off)],
- bitmap)
-
-mkInfoTableAndCode info_lbl std_info extra_bits entry_lbl args blocks
+ 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
+ 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
+ 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
+ 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
+ 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
+ -> ListGraph CmmStmt
+ -> [RawCmmTop]
+mkInfoTableAndCode info_lbl std_info extra_bits entry_lbl blocks
| tablesNextToCode -- Reverse the extra_bits; and emit the top-level proc
- = [CmmProc (map CmmStaticLit (reverse extra_bits ++ std_info)) entry_lbl args blocks]
+ = [CmmProc (map CmmStaticLit (reverse extra_bits ++ std_info))
+ entry_lbl blocks]
- | null blocks -- No actual code; only the info table is significant
+ | 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
- [mkDataLits info_lbl (CmmLabel entry_lbl : std_info ++ extra_bits),
- CmmProc [] entry_lbl args blocks]
+ [CmmProc [] entry_lbl blocks,
+ mkDataLits info_lbl (CmmLabel entry_lbl : std_info ++ extra_bits)]
+
+mkSRTLit :: CLabel
+ -> C_SRT
+ -> ([CmmLit], -- srt_label
+ StgHalfWord) -- srt_bitmap
+mkSRTLit _ 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
-mkLiveness :: Unique -> [Maybe LocalReg] -> (CmmLit, [GenCmmTop CmmStatic [CmmStatic] CmmStmt])
-mkLiveness uniq live
- = if length live > mAX_SMALL_BITMAP_SIZE
- then (CmmLabel big_liveness, [data_lits]) -- does not fit in one word
- else (mkWordCLit small_liveness, []) -- fits in one word
+-- 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
- size = length live
+ 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
- bits = mkBitmap (map is_non_ptr live)
- is_non_ptr Nothing = True
- is_non_ptr (Just reg) | localRegGCFollow reg == KindNonPtr = True
- is_non_ptr (Just reg) | localRegGCFollow reg == KindPtr = False
+ is_non_ptr Nothing = True
+ is_non_ptr (Just reg) = not $ isGcPtrType (localRegType reg)
- big_liveness = mkBitmapLabel uniq
- data_lits = mkRODataLits big_liveness lits
- lits = mkWordCLit (fromIntegral size) : map mkWordCLit bits
-
- small_liveness =
- fromIntegral size .|. (small_bits `shiftL` bITMAP_BITS_SHIFT)
- small_bits = case bits of
+ bits :: [Bool]
+ bits = mkBits live
+
+ bitmap :: Bitmap
+ bitmap = mkBitmap bits
+
+ small_bitmap = case bitmap of
[] -> 0
- [b] -> fromIntegral b
+ [b] -> 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
+
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