diff options
Diffstat (limited to 'compiler/codeGen/StgCmm.hs')
| -rw-r--r-- | compiler/codeGen/StgCmm.hs | 135 |
1 files changed, 54 insertions, 81 deletions
diff --git a/compiler/codeGen/StgCmm.hs b/compiler/codeGen/StgCmm.hs index 7aa159844b..933aeb9d45 100644 --- a/compiler/codeGen/StgCmm.hs +++ b/compiler/codeGen/StgCmm.hs @@ -46,6 +46,13 @@ import TyCon import Module import ErrUtils import Outputable +import Stream + +import OrdList +import MkGraph + +import Data.IORef +import Control.Monad (when) codeGen :: DynFlags -> Module @@ -53,39 +60,51 @@ codeGen :: DynFlags -> CollectedCCs -- (Local/global) cost-centres needing declaring/registering. -> [(StgBinding,[(Id,[Id])])] -- Bindings to convert, with SRTs -> HpcInfo - -> IO [CmmGroup] -- Output + -> Stream IO CmmGroup () -- Output as a stream, so codegen can + -- be interleaved with output codeGen dflags this_mod data_tycons cost_centre_info stg_binds hpc_info - = do { showPass dflags "New CodeGen" - --- Why? --- ; mapM_ (\x -> seq x (return ())) data_tycons - - ; code_stuff <- initC dflags this_mod $ do - { cmm_binds <- mapM (getCmm . cgTopBinding dflags) stg_binds - ; cmm_tycons <- mapM cgTyCon data_tycons - ; cmm_init <- getCmm (mkModuleInit cost_centre_info - this_mod hpc_info) - ; return (cmm_init : cmm_binds ++ cmm_tycons) - } + = do { liftIO $ showPass dflags "New CodeGen" + + -- cg: run the code generator, and yield the resulting CmmGroup + -- Using an IORef to store the state is a bit crude, but otherwise + -- we would need to add a state monad layer. + ; cgref <- liftIO $ newIORef =<< initC + ; let cg :: FCode () -> Stream IO CmmGroup () + cg fcode = do + cmm <- liftIO $ do + st <- readIORef cgref + let (a,st') = runC dflags this_mod st (getCmm fcode) + + -- NB. stub-out cgs_tops and cgs_stmts. This fixes + -- a big space leak. DO NOT REMOVE! + writeIORef cgref $! st'{ cgs_tops = nilOL, + cgs_stmts = mkNop } + return a + yield cmm + + -- Note [codegen-split-init] the cmm_init block must come + -- FIRST. This is because when -split-objs is on we need to + -- combine this block with its initialisation routines; see + -- Note [pipeline-split-init]. + ; cg (mkModuleInit cost_centre_info this_mod hpc_info) + + ; mapM_ (cg . cgTopBinding dflags) stg_binds + -- Put datatype_stuff after code_stuff, because the -- datatype closure table (for enumeration types) to -- (say) PrelBase_True_closure, which is defined in -- code_stuff - - -- N.B. returning '[Cmm]' and not 'Cmm' here makes it - -- possible for object splitting to split up the - -- pieces later. - - -- Note [codegen-split-init] the cmm_init block must - -- come FIRST. This is because when -split-objs is on - -- we need to combine this block with its - -- initialisation routines; see Note - -- [pipeline-split-init]. - - ; return code_stuff } - + ; let do_tycon tycon = do + -- Generate a table of static closures for an + -- enumeration type Note that the closure pointers are + -- tagged. + when (isEnumerationTyCon tycon) $ cg (cgEnumerationTyCon tycon) + mapM_ (cg . cgDataCon) (tyConDataCons tycon) + + ; mapM_ do_tycon data_tycons + } --------------------------------------------------------------- -- Top-level bindings @@ -107,7 +126,7 @@ cgTopBinding dflags (StgNonRec id rhs, _srts) ; info <- cgTopRhs id' rhs ; addBindC (cg_id info) info -- Add the *un-externalised* Id to the envt, -- so we find it when we look up occurrences - } + } cgTopBinding dflags (StgRec pairs, _srts) = do { let (bndrs, rhss) = unzip pairs @@ -116,7 +135,7 @@ cgTopBinding dflags (StgRec pairs, _srts) ; fixC_(\ new_binds -> do { addBindsC new_binds ; mapFCs ( \ (b,e) -> cgTopRhs b e ) pairs' }) - ; return () } + ; return () } -- Urgh! I tried moving the forkStatics call from the rhss of cgTopRhs -- to enclose the listFCs in cgTopBinding, but that tickled the @@ -186,65 +205,19 @@ mkModuleInit cost_centre_info this_mod hpc_info ; emitDecl (CmmData Data (Statics (mkPlainModuleInitLabel this_mod) [])) } + --------------------------------------------------------------- -- Generating static stuff for algebraic data types --------------------------------------------------------------- -{- [These comments are rather out of date] - -Macro Kind of constructor -CONST_INFO_TABLE@ Zero arity (no info -- compiler uses static closure) -CHARLIKE_INFO_TABLE Charlike (no info -- compiler indexes fixed array) -INTLIKE_INFO_TABLE Intlike; the one macro generates both info tbls -SPEC_INFO_TABLE SPECish, and bigger than or equal to MIN_UPD_SIZE -GEN_INFO_TABLE GENish (hence bigger than or equal to MIN_UPD_SIZE@) -Possible info tables for constructor con: - -* _con_info: - Used for dynamically let(rec)-bound occurrences of - the constructor, and for updates. For constructors - which are int-like, char-like or nullary, when GC occurs, - the closure tries to get rid of itself. - -* _static_info: - Static occurrences of the constructor macro: STATIC_INFO_TABLE. - -For zero-arity constructors, \tr{con}, we NO LONGER generate a static closure; -it's place is taken by the top level defn of the constructor. - -For charlike and intlike closures there is a fixed array of static -closures predeclared. --} - -cgTyCon :: TyCon -> FCode CmmGroup -- All constructors merged together -cgTyCon tycon - = do { constrs <- mapM (getCmm . cgDataCon) (tyConDataCons tycon) - - -- Generate a table of static closures for an enumeration type - -- Put the table after the data constructor decls, because the - -- datatype closure table (for enumeration types) - -- to (say) PrelBase_$wTrue_closure, which is defined in code_stuff - -- Note that the closure pointers are tagged. - - -- N.B. comment says to put table after constructor decls, but - -- code puts it before --- NR 16 Aug 2007 - ; extra <- cgEnumerationTyCon tycon - - ; return (concat (extra ++ constrs)) - } - -cgEnumerationTyCon :: TyCon -> FCode [CmmGroup] +cgEnumerationTyCon :: TyCon -> FCode () cgEnumerationTyCon tycon - | isEnumerationTyCon tycon - = do { tbl <- getCmm $ - emitRODataLits (mkLocalClosureTableLabel (tyConName tycon) NoCafRefs) - [ CmmLabelOff (mkLocalClosureLabel (dataConName con) NoCafRefs) - (tagForCon con) - | con <- tyConDataCons tycon] - ; return [tbl] } - | otherwise - = return [] + = emitRODataLits (mkLocalClosureTableLabel (tyConName tycon) NoCafRefs) + [ CmmLabelOff (mkLocalClosureLabel (dataConName con) NoCafRefs) + (tagForCon con) + | con <- tyConDataCons tycon] + cgDataCon :: DataCon -> FCode () -- Generate the entry code, info tables, and (for niladic constructor) |