X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fcmm%2FCmmCPS.hs;h=35eabb331704e26e3a83cb8468b661105e3eeb36;hp=88d2585c575919203a7774434649dead7872a3f1;hb=643397208b83f1654bceeef40c793f11592ef816;hpb=b4fd46494dc922a8e1134c9396cada1f10e74e55 diff --git a/compiler/cmm/CmmCPS.hs b/compiler/cmm/CmmCPS.hs index 88d2585..35eabb3 100644 --- a/compiler/cmm/CmmCPS.hs +++ b/compiler/cmm/CmmCPS.hs @@ -1,489 +1,171 @@ -module CmmCPS (cmmCPS) where +{-# OPTIONS_GHC -XNoMonoLocalBinds #-} +-- Norman likes local bindings +-- If this module lives on I'd like to get rid of this flag in due course -#include "HsVersions.h" +module CmmCPS ( + -- | Converts C-- with full proceedures and parameters + -- to a CPS transformed C-- with the stack made manifest. + -- Well, sort of. + protoCmmCPS +) where -import Cmm -import CmmLint -import PprCmm - -import Dataflow -- (fixedpoint, cmmLivenessComment, cmmLiveness, CmmLive) - -import MachOp -import ForeignCall import CLabel -import SMRep -import Constants +import Cmm +import CmmDecl +import CmmBuildInfoTables +import CmmCommonBlockElim +import CmmProcPoint +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 - --------------------------------------------------------------------------------- --- Monad for the CPSer --- Contains: --- * State for the uniqSupply - -data CPSState = CPSState { cps_uniqs :: UniqSupply } - -data CPS a = CPS { runCPS :: CPSState -> (CPSState, a) } - -instance Monad CPS where - return a = CPS $ \s -> (s, a) - (CPS m) >>= f = CPS $ \s -> - let (s', m') = m s - in runCPS (f m') s' - --------------------------------------------------------------------------------- --- Utility functions - -getState = CPS $ \s -> (s, s) -putState s = CPS $ \_ -> (s, ()) - -newLabelCPS = do - state <- getState - let (us1, us2) = splitUniqSupply (cps_uniqs state) - putState $ state { cps_uniqs = us1 } - return $ BlockId (uniqFromSupply us2) - -mapMCmmTop :: (Monad m) => (CmmTop -> m [CmmTop]) -> Cmm -> m Cmm -mapMCmmTop f (Cmm xs) = liftM Cmm $ liftM concat $ mapM f xs - --------------------------------------------------------------------------------- - --- The format for the call to a continuation --- The fst is the arguments that must be passed to the continuation --- by the continuation's caller. --- The snd is the live values that must be saved on stack. --- A Nothing indicates an ignored slot. --- The head of each list is the stack top or the first parameter. - --- The format for live values for a particular continuation --- All on stack for now. --- Head element is the top of the stack (or just under the header). --- Nothing means an empty slot. --- Future possibilities include callee save registers (i.e. passing slots in register) --- and heap memory (not sure if that's usefull at all though, but it may --- be worth exploring the design space). - -data BrokenBlock - = BrokenBlock - BlockId -- Like a CmmBasicBlock - BlockEntryInfo -- How this block can be entered - [CmmStmt] -- Like a CmmBasicBlock (but without - -- the last statement) - BlockExitInfo -- How the block can be left - -data BlockEntryInfo - = FunctionEntry -- Beginning of function - - | ContinuationEntry -- Return point of a call - CmmFormals {- return values -} - -- TODO | ProcPointEntry {- no return values, but some live might end up as params -} - - | ControlEntry -- A label in the input - -data BlockExitInfo - = ControlExit [BlockId] -- blocks branched to conditionally - BlockId -- next block (must be a ControlEntry) - - | ReturnExit [BlockId] -- blocks branched to conditionally - CmmActuals -- return values - - | TailCallExit [BlockId] -- blocks branched to conditionally - CmmExpr -- the function to call - CmmActuals -- arguments to call - - | CallExit [BlockId] -- blocks branched to conditionally - BlockId -- next block after call (must be a ContinuationEntry) - CmmCallTarget -- the function to call - CmmFormals -- results from call (redundant with ContinuationEntry) - CmmActuals -- arguments to call - (Maybe [GlobalReg]) -- registers that must be saved (TODO) - -- TODO: | ProcPointExit (needed?) - -data CPSBlockInfo - = ControlBlock -- Consider whether a proc-point might want arguments on stack - | ContinuationBlock [(CmmReg,MachHint)] {- params -} - | EntryBlock - ---type StackFormat = [Maybe LocalReg] -- TODO: consider params as part of format -data StackFormat - = StackFormat - BlockId {- block that is the start of the continuation. may or may not be the current block -} - WordOff {- total frame size -} - [(CmmReg, WordOff)] {- local reg offsets from stack top -} - --- A block can be a continuation of a call --- A block can be a continuation of another block (w/ or w/o joins) --- A block can be an entry to a function - --------------------------------------------------------------------------------- --- For now just select the continuation orders in the order they are in the set with no gaps --- TODO: select a format that keeps blocks that can jump to each other the same --- Assumed that jumps, calls -selectStackFormat :: UniqFM {-BlockId-} CmmFormals -> UniqFM {-BlockId-} CmmLive -> UniqFM {-BlockId-} [(CPSBlockInfo, CmmBasicBlock)] -> UniqFM {-BlockId-} StackFormat -selectStackFormat = undefined -{- -selectStackFormat param live blocks = fixedpoint -listToUFM $ map live_to_format $ ufmToList live - where - live_to_format (unique, live) = (unique, format) where - format = foldl extend_format - (StackFormat (BlockId unique) retAddrSizeW []) - (uniqSetToList live) - extend_format :: StackFormat -> LocalReg -> StackFormat - extend_format (StackFormat block size offsets) reg = - StackFormat block (slot_size reg + size) ((CmmLocal reg, size) : offsets) --} - -selectStackFormat2 :: UniqFM {-BlockId-} CmmLive -> [BrokenBlock] -> UniqFM {-BlockId-} StackFormat -selectStackFormat2 live blocks = fixedpoint dependants update (map brokenBlockId blocks) emptyUFM where - blocks_ufm = listToUFM $ map (\b -> (brokenBlockId b, b)) blocks - dependants ident = - case lookupWithDefaultUFM blocks_ufm (panic "TODO") ident of - (BrokenBlock _ _ _ (ControlExit exits next)) -> next:exits - (BrokenBlock _ _ _ (ReturnExit exits _)) -> exits - (BrokenBlock _ _ _ (TailCallExit exits _ _)) -> exits - (BrokenBlock _ _ _ (CallExit exits _ _ _ _ _)) -> exits - update ident cause formats = - let BrokenBlock _ entry _ _ = lookupWithDefaultUFM blocks_ufm (panic "unknown BlockId in selectStackFormat:live") ident in - case cause of - -- Propagate only to blocks entered by branches (not function entry blocks or continuation entry blocks) - Just cause_name -> - let cause_format = lookupWithDefaultUFM formats (panic "update signaled for block not in format") cause_name - in case entry of - ControlEntry -> Just $ addToUFM formats ident cause_format - FunctionEntry -> Nothing - ContinuationEntry _ -> Nothing - -- Do initial calculates for function blocks - Nothing -> - case entry of - ControlEntry -> Nothing - FunctionEntry -> Just $ addToUFM formats ident $ StackFormat ident 0 [] - ContinuationEntry _ -> Just $ addToUFM formats ident $ live_to_format ident $ lookupWithDefaultUFM live (panic "TODO") ident - live_to_format label live = - foldl extend_format - (StackFormat label retAddrSizeW []) - (uniqSetToList live) - extend_format :: StackFormat -> LocalReg -> StackFormat - extend_format (StackFormat block size offsets) reg = - StackFormat block (slot_size reg + size) ((CmmLocal reg, size) : offsets) - -slot_size reg = ((machRepByteWidth (localRegRep reg) - 1) `div` wORD_SIZE) + 1 - -transformReturn :: UniqFM {-BlockId-} CPSBlockInfo -> UniqFM {-BlockId-} StackFormat -> CmmBasicBlock -> CmmBasicBlock -transformReturn block_infos formats (BasicBlock ident stmts) = - -- NOTE: assumes that return/jump can *only* appear at end of block - case last stmts of - CmmReturn arguments -> - BasicBlock ident $ - (init stmts) ++ - exit_function curr_format (CmmLoad (CmmReg spReg) wordRep) arguments - CmmJump target arguments -> - BasicBlock ident $ - (init stmts) ++ - exit_function curr_format target arguments - _ -> BasicBlock ident stmts - where - curr_format = lookupWithDefaultUFM formats (panic $ "format: unknown block " ++ (showSDoc $ ppr $ getUnique ident)) ident - -destructContinuation :: UniqFM {-BlockId-} CPSBlockInfo -> UniqFM {-BlockId-} StackFormat -> CmmBasicBlock -> CmmBasicBlock -destructContinuation block_infos formats (BasicBlock ident stmts) = - case info of - ControlBlock -> BasicBlock ident stmts - ContinuationBlock _ -> BasicBlock ident (unpack_continuation curr_format ++ stmts) - where - info = lookupWithDefaultUFM block_infos (panic $ "info: unknown block " ++ (showSDoc $ ppr $ getUnique ident)) ident - curr_format = lookupWithDefaultUFM formats (panic $ "format: unknown block " ++ (showSDoc $ ppr $ getUnique ident)) ident - -constructContinuation2 :: UniqFM {-BlockId-} StackFormat -> BrokenBlock -> CmmBasicBlock -constructContinuation2 formats (BrokenBlock ident entry stmts exit) = - BasicBlock ident (prefix++stmts++postfix) - where - curr_format = lookupWithDefaultUFM formats (panic $ "format: unknown block " ++ (showSDoc $ ppr $ getUnique ident)) ident - prefix = case entry of - ControlEntry -> [] - FunctionEntry -> [] - ContinuationEntry formals -> unpack_continuation curr_format - postfix = case exit of - ControlExit _ next -> [CmmBranch next] - ReturnExit _ arguments -> exit_function curr_format (CmmLoad (CmmReg spReg) wordRep) arguments - TailCallExit _ target arguments -> exit_function curr_format target arguments - -- TODO: do something about global saves - CallExit _ next (CmmForeignCall target CmmCallConv) results arguments saves -> - let cont_format = lookupWithDefaultUFM formats (panic $ "format: unknown block " ++ (showSDoc $ ppr $ getUnique next)) next - in pack_continuation curr_format cont_format ++ - [CmmJump target arguments] - CallExit _ next _ results arguments saves -> panic "unimplemented CmmCall" - -constructContinuation :: UniqFM {-BlockId-} CPSBlockInfo -> UniqFM {-BlockId-} StackFormat -> CmmBasicBlock -> CmmBasicBlock -constructContinuation block_infos formats (BasicBlock ident stmts) = - case last $ init stmts of - -- TODO: global_saves - --CmmCall (CmmForeignCall target CmmCallConv) results arguments (Just []) -> --TODO: handle globals - CmmCall (CmmForeignCall target CmmCallConv) results arguments _ -> - BasicBlock ident $ - init (init stmts) ++ - pack_continuation curr_format cont_format ++ - [CmmJump target arguments] - CmmCall target results arguments _ -> panic "unimplemented CmmCall" - -- TODO: branches for proc-points - -- _ -> BasicBlock ident $ (init stmts) ++ build_block_branch - _ -> BasicBlock ident stmts - where - info = lookupWithDefaultUFM block_infos (panic $ "info: unknown block " ++ (showSDoc $ ppr $ getUnique next_block)) next_block - cont_format = lookupWithDefaultUFM formats (panic $ "format: unknown block " ++ (showSDoc $ ppr $ getUnique next_block)) next_block - curr_format = lookupWithDefaultUFM formats (panic $ "format: unknown block " ++ (showSDoc $ ppr $ getUnique next_block)) ident - next_block = case last stmts of - CmmBranch next -> next - -- TODO: blocks with jump at end - -- TODO: blocks with return at end - _ -> panic $ "basic block without a branch at the end (unimplemented) " ++ (showSDoc $ ppr $ stmts) - next_block_as_proc_expr = CmmLit $ CmmLabel $ mkReturnPtLabel $ getUnique next_block - block_needs_call = True -- TODO: use a table (i.e. proc-point) - build_block_branch = - if block_needs_call - then [CmmJump next_block_as_proc_expr [] {- TODO: pass live -}] {- NOTE: a block can never be both a continuation and a controll block -} - else [CmmBranch next_block] - --------------------------------------------------------------------------------- --- Functions that generate CmmStmt sequences --- for packing/unpacking continuations --- and entering/exiting functions - -exit_function :: StackFormat -> CmmExpr -> CmmActuals -> [CmmStmt] -exit_function (StackFormat curr_id curr_frame_size curr_offsets) target arguments - = adjust_spReg ++ jump where - adjust_spReg = [ - CmmAssign spReg - (CmmRegOff spReg (curr_frame_size*wORD_SIZE))] - jump = [CmmJump target arguments] - -enter_function :: WordOff -> [CmmStmt] -enter_function max_frame_size - = check_stack_limit where - check_stack_limit = [ - CmmCondBranch - (CmmMachOp (MO_U_Lt $ cmmRegRep spReg) - [CmmRegOff spReg max_frame_size, CmmReg spLimReg]) - gc_block] - gc_block = undefined -- TODO: get stack and heap checks to go to same - --- 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 curr_offsets) - (StackFormat cont_id cont_frame_size cont_offsets) - = save_live_values ++ set_stack_header ++ adjust_spReg where - -- TODO: only save variables when actually needed - save_live_values = - [CmmStore - (CmmRegOff - spReg (wORD_SIZE*(curr_frame_size - cont_frame_size + offset))) - (CmmReg reg) - | (reg, offset) <- cont_offsets] - set_stack_header = -- TODO: only set when needed - [CmmStore (CmmRegOff spReg (wORD_SIZE*(curr_frame_size - cont_frame_size))) continuation_function] - continuation_function = CmmLit $ CmmLabel $ mkReturnPtLabel $ getUnique cont_id - adjust_spReg = - if curr_frame_size == cont_frame_size - then [] - else [CmmAssign spReg (CmmRegOff spReg ((curr_frame_size - cont_frame_size)*wORD_SIZE))] - --- Lazy adjustment of stack headers assumes all blocks --- that could branch to eachother (i.e. control blocks) --- have the same stack format (this causes a problem --- only for proc-point). -unpack_continuation :: StackFormat -> [CmmStmt] -unpack_continuation (StackFormat curr_id curr_frame_size curr_offsets) - = load_live_values where - -- TODO: only save variables when actually needed - load_live_values = - [CmmAssign - reg - (CmmLoad (CmmRegOff spReg (wORD_SIZE*offset)) (cmmRegRep reg)) - | (reg, offset) <- curr_offsets] - --- TODO: TBD when to adjust the stack - -cpsProc :: CmmTop -> CPS [CmmTop] -cpsProc x@(CmmData _ _) = return [x] -cpsProc x@(CmmProc info_table ident params blocks) = do - - broken_blocks <- liftM concat $ mapM breakBlock blocks - broken_blocks2 <- liftM concat (zipWithM breakBlock2 blocks (FunctionEntry:repeat ControlEntry)) - -- broken_blocks :: [BrokenBlock] - - let live = cmmLiveness (map snd broken_blocks) - let live2 :: BlockEntryLiveness - live2 = cmmLiveness2 broken_blocks2 - - let blocks_with_live = map (cmmLivenessComment live . snd) broken_blocks - - let formats = selectStackFormat (panic "params to selectStackFormat" {-TODO-}) live (undefined) - let formats2 :: BlockEnv StackFormat -- Stack format on entry - formats2 = selectStackFormat2 live2 broken_blocks2 - - let block_infos = listToUFM $ map (\(info, block) -> (blockId block, info)) broken_blocks - --let blocks_with_live' = map (constructContinuation block_infos formats) blocks_with_live - --let blocks_with_live'' = map (destructContinuation block_infos formats) blocks_with_live' - --let blocks_with_live''' = map (transformReturn block_infos formats) blocks_with_live'' - - return $ [CmmProc info_table ident params $ map (constructContinuation2 formats2) broken_blocks2] -{- - return $ [CmmProc info_table ident params $ - map (constructContinuation block_infos formats . - destructContinuation block_infos formats . - transformReturn block_infos formats) - blocks_with_live] +import StaticFlags + +----------------------------------------------------------------------------- +-- |Top level driver for the CPS pass +----------------------------------------------------------------------------- +-- 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. -} --------------------------------------------------------------------------------- --- Takes a basic block and returns a list of basic blocks that --- each have at most 1 CmmCall in them which must occur at the end. --- Also returns with each basic block, the variables that will --- be arguments to the continuation of the block once the call (if any) returns. - -cmmBlockifyCalls :: [CmmBasicBlock] -> CPS [(CPSBlockInfo, CmmBasicBlock)] -cmmBlockifyCalls blocks = liftM concat $ mapM breakBlock blocks - --- [(CmmReg,MachHint)] is the results from the previous block that are expected as parameters ---breakBlock :: CmmBasicBlock -> CPS [(Maybe BlockId, CmmBasicBlock)] -breakBlock :: CmmBasicBlock -> CPS [(CPSBlockInfo, CmmBasicBlock)] -breakBlock (BasicBlock ident stmts) = breakBlock' ident ControlBlock [] stmts - -breakBlock' current_id block_info accum_stmts [] = - return [(block_info, BasicBlock current_id accum_stmts)] --- TODO: notice a call just before a branch, jump, call, etc. -breakBlock' current_id block_info accum_stmts (stmt@(CmmCall _ results _ _):stmts) = do - new_id <- newLabelCPS - let new_block = (block_info, BasicBlock current_id (accum_stmts ++ [stmt, CmmBranch new_id])) - rest <- breakBlock' new_id (ContinuationBlock results) [] stmts - return $ (new_block:rest) -breakBlock' current_id arguments accum_stmts (stmt:stmts) = - breakBlock' current_id arguments (accum_stmts ++ [stmt]) stmts - -breakBlock2 (BasicBlock ident stmts) entry = breakBlock2' ident entry [] [] stmts - -breakBlock2' current_id block_info exits accum_stmts [] = - panic "block doesn't end in jump, goto or return" -breakBlock2' current_id entry exits accum_stmts [CmmJump target arguments] = - return [BrokenBlock current_id entry accum_stmts (TailCallExit exits target arguments)] -breakBlock2' current_id entry exits accum_stmts [CmmReturn arguments] = - return [BrokenBlock current_id entry accum_stmts (ReturnExit exits arguments)] -breakBlock2' current_id entry exits accum_stmts [CmmBranch target] = - return [BrokenBlock current_id entry accum_stmts (ControlExit exits target)] -breakBlock2' _ _ _ _ (CmmJump _ _:_) = panic "jump in middle of block" -breakBlock2' _ _ _ _ (CmmReturn _:_) = panic "return in middle of block" -breakBlock2' _ _ _ _ (CmmBranch _:_) = panic "branch in middle of block" -breakBlock2' _ _ _ _ (CmmSwitch _ _:_) = panic "switch in block not implemented" -breakBlock2' current_id entry exits accum_stmts (CmmCall target results arguments saves:stmts) = do - new_id <- newLabelCPS - rest <- breakBlock2' new_id (ContinuationEntry results) [] [] stmts - return $ BrokenBlock current_id entry accum_stmts (CallExit exits new_id target results arguments saves) : rest -breakBlock2' current_id entry exits accum_stmts (s@(CmmCondBranch test target):stmts) = - breakBlock2' current_id entry (target:exits) (accum_stmts++[s]) stmts -breakBlock2' current_id entry exits accum_stmts (s:stmts) = - breakBlock2' current_id entry exits (accum_stmts++[s]) stmts - -brokenBlockTargets (BrokenBlock _ _ _ (TailCallExit exits _ _)) = exits -brokenBlockTargets (BrokenBlock _ _ _ (ReturnExit exits _)) = exits -brokenBlockTargets (BrokenBlock _ _ _ (ControlExit exits target)) = target:exits -brokenBlockTargets (BrokenBlock _ _ _ (CallExit exits next _ _ _ _)) = next:exits - -brokenBlockId (BrokenBlock ident _ _ _) = ident - -cmmBrokenBlockSources :: - [BrokenBlock] -> UniqFM {-BlockId-} (UniqSet BlockId) -cmmBrokenBlockSources blocks = foldr aux emptyUFM blocks where - aux block sourcesUFM = - foldr add_source_edges sourcesUFM targets where - add_source_edges t ufm = - addToUFM_Acc (flip addOneToUniqSet) unitUniqSet ufm t ident - targets = brokenBlockTargets block - ident = brokenBlockId block - -cmmBrokenBlockNames :: [BrokenBlock] -> UniqFM {-BlockId-} BrokenBlock -cmmBrokenBlockNames blocks = listToUFM $ map block_name blocks where - block_name b = (brokenBlockId b, b) - -cmmBrokenBlockDependants :: UniqFM {-BlockId-} (UniqSet BlockId) -> BlockId -> [BlockId] -cmmBrokenBlockDependants sources ident = - uniqSetToList $ lookupWithDefaultUFM sources emptyUniqSet ident - -cmmBrokenBlockLive :: UniqFM {-BlockId-} CmmLive -> BrokenBlock -> CmmLive -cmmBrokenBlockLive other_live (BrokenBlock _ _ stmts exit) = - foldr ((.) . (cmmStmtLive other_live)) id stmts live_at_end - where - live_at_end = - case exit of - ControlExit _ _ -> emptyUniqSet - ReturnExit _ actuals -> foldr ((.) . cmmExprLive) id (map fst actuals) emptyUniqSet - TailCallExit _ target actuals -> - cmmExprLive target $ foldr ((.) . cmmExprLive) id (map fst actuals) $ emptyUniqSet - CallExit _ _ target _ actuals live -> - target_liveness $ - foldr ((.) . cmmExprLive) id (map fst actuals) $ - emptyUniqSet - where - only_local_regs [] = [] - only_local_regs ((CmmGlobal _,_):args) = only_local_regs args - only_local_regs ((CmmLocal r,_):args) = r:only_local_regs args - target_liveness = - case target of - (CmmForeignCall target _) -> cmmExprLive target - (CmmPrim _) -> id - - -cmmBrokenBlockUpdate :: - UniqFM {-BlockId-} BrokenBlock - -> BlockId - -> Maybe BlockId - -> UniqFM {-BlockId-} CmmLive - -> Maybe (UniqFM {-BlockId-} CmmLive) -cmmBrokenBlockUpdate blocks node _ state = - let old_live = lookupWithDefaultUFM state (panic "unknown block id during liveness analysis") node - block = lookupWithDefaultUFM blocks (panic "unknown block id during liveness analysis") node - new_live = cmmBrokenBlockLive state block - in if (sizeUniqSet old_live) == (sizeUniqSet new_live) - then Nothing - else Just $ addToUFM state node new_live - - -cmmLiveness2 :: [BrokenBlock] -> UniqFM {-BlockId-} CmmLive -cmmLiveness2 blocks = - fixedpoint (cmmBrokenBlockDependants sources) (cmmBrokenBlockUpdate blocks') - (map brokenBlockId blocks) (listToUFM [(brokenBlockId b, emptyUniqSet) | b <- blocks]) where - sources = cmmBrokenBlockSources blocks - blocks' = cmmBrokenBlockNames blocks - --------------------------------------------------------------------------------- -cmmCPS :: DynFlags - -> [Cmm] -- C-- with Proceedures - -> IO [Cmm] -- Output: CPS transformed C-- - -cmmCPS dflags abstractC = do - when (dopt Opt_DoCmmLinting dflags) $ - do showPass dflags "CmmLint" - case firstJust $ map cmmLint abstractC of - Just err -> do printDump err - ghcExit dflags 1 - Nothing -> return () - showPass dflags "CPS" - -- TODO: check for use of branches to non-existant blocks - -- TODO: check for use of Sp, SpLim, R1, R2, etc. - -- continuationC <- return abstractC - -- TODO: find out if it is valid to create a new unique source like this - uniqSupply <- mkSplitUniqSupply 'p' - let (_, continuationC) = runCPS (mapM (mapMCmmTop cpsProc) abstractC) (CPSState uniqSupply) - - dumpIfSet_dyn dflags Opt_D_dump_cps_cmm "CPS Cmm" (pprCmms continuationC) - -- TODO: add option to dump Cmm to file - return continuationC +-- 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)