X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2FcodeGen%2FCodeGen.lhs;h=7a7bf48b92988c4f2c3ed0ac9ffc6889ad50cff5;hp=48c0cbfbb9ecada36ba23a9b07cdd01cd80e417f;hb=2c8aabcad1d2f2c469cb8a10afa7b66beeaedd45;hpb=6bca92c3f75df35fcb2ec23d56107783373da7e6 diff --git a/compiler/codeGen/CodeGen.lhs b/compiler/codeGen/CodeGen.lhs index 48c0cbf..7a7bf48 100644 --- a/compiler/codeGen/CodeGen.lhs +++ b/compiler/codeGen/CodeGen.lhs @@ -1,19 +1,15 @@ % +% (c) The University of Glasgow 2006 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998 % -\section[CodeGen]{@CodeGen@: main module of the code generator} + +The Code Generator This module says how things get going at the top level. @codeGen@ is the interface to the outside world. The \tr{cgTop*} functions drive the mangling of top-level bindings. -%************************************************************************ -%* * -\subsection[codeGen-outside-interface]{The code generator's offering to the world} -%* * -%************************************************************************ - \begin{code} module CodeGen ( codeGen ) where @@ -25,202 +21,95 @@ module CodeGen ( codeGen ) where import CgExpr ( {-NOTHING!-} ) -- DO NOT DELETE THIS IMPORT import CgProf import CgMonad -import CgBindery ( CgIdInfo, addBindC, addBindsC, getCgIdInfo, - cgIdInfoId ) -import CgClosure ( cgTopRhsClosure ) -import CgCon ( cgTopRhsCon, cgTyCon ) -import CgUtils ( cmmRegOffW, emitRODataLits, cmmNeWord ) +import CgBindery +import CgClosure +import CgCon +import CgUtils +import CgHpc import CLabel -import Cmm -import CmmUtils ( zeroCLit, mkIntCLit, mkLblExpr ) -import PprCmm ( pprCmms ) -import MachOp ( wordRep ) +import OldCmm +import OldPprCmm import StgSyn -import PrelNames ( gHC_PRIM, rOOT_MAIN, pREL_TOP_HANDLER ) -import Packages ( HomeModules ) -import DynFlags ( DynFlags(..), DynFlag(..), dopt ) -import StaticFlags ( opt_SccProfilingOn ) - -import HscTypes ( ForeignStubs(..) ) -import CostCentre ( CollectedCCs ) -import Id ( Id, idName, setIdName ) -import Name ( nameSrcLoc, nameOccName, nameUnique, isInternalName, mkExternalName ) -import OccName ( mkLocalOcc ) -import TyCon ( TyCon ) -import Module ( Module ) -import ErrUtils ( dumpIfSet_dyn, showPass ) -import Panic ( assertPanic ) - -#ifdef DEBUG -import Outputable -#endif +import PrelNames +import DynFlags +import StaticFlags + +import HscTypes +import CostCentre +import Id +import Name +import TyCon +import Module +import ErrUtils +import Panic \end{code} \begin{code} codeGen :: DynFlags - -> HomeModules -> Module -> [TyCon] - -> ForeignStubs - -> [Module] -- directly-imported modules - -> CollectedCCs -- (Local/global) cost-centres needing declaring/registering. + -> CollectedCCs -- (Local/global) cost-centres needing declaring/registering. -> [(StgBinding,[(Id,[Id])])] -- Bindings to convert, with SRTs + -> HpcInfo -> IO [Cmm] -- Output -codeGen dflags hmods this_mod data_tycons foreign_stubs imported_mods - cost_centre_info stg_binds + -- N.B. returning '[Cmm]' and not 'Cmm' here makes it + -- possible for object splitting to split up the + -- pieces later. + +codeGen dflags this_mod data_tycons cost_centre_info stg_binds hpc_info = do { showPass dflags "CodeGen" - ; let way = buildTag dflags - main_mod = mainModIs dflags -- Why? -- ; mapM_ (\x -> seq x (return ())) data_tycons - ; code_stuff <- initC dflags hmods this_mod $ do - { cmm_binds <- mapM (getCmm . cgTopBinding dflags hmods) stg_binds + ; 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 dflags hmods way cost_centre_info - this_mod main_mod - foreign_stubs imported_mods) - ; return (cmm_binds ++ concat cmm_tycons ++ [cmm_init]) + ; cmm_init <- getCmm (mkModuleInit dflags cost_centre_info + this_mod hpc_info) + ; return (cmm_init : cmm_binds ++ concat cmm_tycons) } -- 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 + -- 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]. + ; dumpIfSet_dyn dflags Opt_D_dump_cmm "Cmm" (pprCmms code_stuff) ; return code_stuff } -\end{code} - -%************************************************************************ -%* * -\subsection[codegen-init]{Module initialisation code} -%* * -%************************************************************************ - -/* ----------------------------------------------------------------------------- - Module initialisation - The module initialisation code looks like this, roughly: - - FN(__stginit_Foo) { - JMP_(__stginit_Foo_1_p) - } - - FN(__stginit_Foo_1_p) { - ... - } - - We have one version of the init code with a module version and the - 'way' attached to it. The version number helps to catch cases - where modules are not compiled in dependency order before being - linked: if a module has been compiled since any modules which depend on - it, then the latter modules will refer to a different version in their - init blocks and a link error will ensue. - - The 'way' suffix helps to catch cases where modules compiled in different - ways are linked together (eg. profiled and non-profiled). +mkModuleInit + :: DynFlags + -> CollectedCCs -- cost centre info + -> Module + -> HpcInfo + -> Code - We provide a plain, unadorned, version of the module init code - which just jumps to the version with the label and way attached. The - reason for this is that when using foreign exports, the caller of - startupHaskell() must supply the name of the init function for the "top" - module in the program, and we don't want to require that this name - has the version and way info appended to it. - -------------------------------------------------------------------------- */ +mkModuleInit dflags cost_centre_info this_mod hpc_info + = do { -- Allocate the static boolean that records if this + ; whenC (opt_Hpc) $ + hpcTable this_mod hpc_info -We initialise the module tree by keeping a work-stack, - * pointed to by Sp - * that grows downward - * Sp points to the last occupied slot + ; whenC (opt_SccProfilingOn) $ do + initCostCentres cost_centre_info + -- For backwards compatibility: user code may refer to this + -- label for calling hs_add_root(). + ; emitData Data $ [ CmmDataLabel (mkPlainModuleInitLabel this_mod) ] -\begin{code} -mkModuleInit - :: DynFlags - -> HomeModules - -> String -- the "way" - -> CollectedCCs -- cost centre info - -> Module - -> Module -- name of the Main module - -> ForeignStubs - -> [Module] - -> Code -mkModuleInit dflags hmods way cost_centre_info this_mod main_mod foreign_stubs imported_mods - = do { - if opt_SccProfilingOn - then do { -- Allocate the static boolean that records if this - -- module has been registered already - emitData Data [CmmDataLabel moduleRegdLabel, - CmmStaticLit zeroCLit] - - ; emitSimpleProc real_init_lbl $ do - { ret_blk <- forkLabelledCode ret_code - - ; init_blk <- forkLabelledCode $ do - { mod_init_code; stmtC (CmmBranch ret_blk) } - - ; stmtC (CmmCondBranch (cmmNeWord (CmmLit zeroCLit) mod_reg_val) - ret_blk) - ; stmtC (CmmBranch init_blk) - } - } - else emitSimpleProc real_init_lbl ret_code - - -- Make the "plain" procedure jump to the "real" init procedure - ; emitSimpleProc plain_init_lbl jump_to_init - - -- When compiling the module in which the 'main' function lives, - -- (that is, this_mod == main_mod) - -- we inject an extra stg_init procedure for stg_init_ZCMain, for the - -- RTS to invoke. We must consult the -main-is flag in case the - -- user specified a different function to Main.main - ; whenC (this_mod == main_mod) - (emitSimpleProc plain_main_init_lbl jump_to_init) + ; whenC (this_mod == mainModIs dflags) $ + emitSimpleProc (mkPlainModuleInitLabel rOOT_MAIN) $ return () } - where - plain_init_lbl = mkPlainModuleInitLabel hmods this_mod - real_init_lbl = mkModuleInitLabel hmods this_mod way - plain_main_init_lbl = mkPlainModuleInitLabel hmods rOOT_MAIN - - jump_to_init = stmtC (CmmJump (mkLblExpr real_init_lbl) []) - - mod_reg_val = CmmLoad (mkLblExpr moduleRegdLabel) wordRep - - -- Main refers to GHC.TopHandler.runIO, so make sure we call the - -- init function for GHC.TopHandler. - extra_imported_mods - | this_mod == main_mod = [pREL_TOP_HANDLER] - | otherwise = [] - - mod_init_code = do - { -- Set mod_reg to 1 to record that we've been here - stmtC (CmmStore (mkLblExpr moduleRegdLabel) (CmmLit (mkIntCLit 1))) - - -- Now do local stuff - ; initCostCentres cost_centre_info - ; mapCs (registerModuleImport hmods way) - (imported_mods++extra_imported_mods) - } - - -- The return-code pops the work stack by - -- incrementing Sp, and then jumpd to the popped item - ret_code = stmtsC [ CmmAssign spReg (cmmRegOffW spReg 1) - , CmmJump (CmmLoad (cmmRegOffW spReg (-1)) wordRep) [] ] - ------------------------ -registerModuleImport :: HomeModules -> String -> Module -> Code -registerModuleImport hmods way mod - | mod == gHC_PRIM - = nopC - | otherwise -- Push the init procedure onto the work stack - = stmtsC [ CmmAssign spReg (cmmRegOffW spReg (-1)) - , CmmStore (CmmReg spReg) (mkLblExpr (mkModuleInitLabel hmods mod way)) ] \end{code} @@ -239,9 +128,7 @@ initCostCentres (local_CCs, ___extern_CCs, singleton_CCSs) | otherwise = do { mapM_ emitCostCentreDecl local_CCs ; mapM_ emitCostCentreStackDecl singleton_CCSs - ; mapM_ emitRegisterCC local_CCs - ; mapM_ emitRegisterCCS singleton_CCSs - } + } \end{code} %************************************************************************ @@ -261,32 +148,32 @@ style, with the increasing static environment being plumbed as a state variable. \begin{code} -cgTopBinding :: DynFlags -> HomeModules -> (StgBinding,[(Id,[Id])]) -> Code -cgTopBinding dflags hmods (StgNonRec id rhs, srts) +cgTopBinding :: DynFlags -> (StgBinding,[(Id,[Id])]) -> Code +cgTopBinding dflags (StgNonRec id rhs, srts) = do { id' <- maybeExternaliseId dflags id - ; mapM_ (mkSRT hmods [id']) srts + ; mapM_ (mkSRT [id']) srts ; (id,info) <- cgTopRhs id' rhs ; addBindC id info -- Add the *un-externalised* Id to the envt, -- so we find it when we look up occurrences } -cgTopBinding dflags hmods (StgRec pairs, srts) +cgTopBinding dflags (StgRec pairs, srts) = do { let (bndrs, rhss) = unzip pairs ; bndrs' <- mapFCs (maybeExternaliseId dflags) bndrs ; let pairs' = zip bndrs' rhss - ; mapM_ (mkSRT hmods bndrs') srts + ; mapM_ (mkSRT bndrs') srts ; _new_binds <- fixC (\ new_binds -> do { addBindsC new_binds ; mapFCs ( \ (b,e) -> cgTopRhs b e ) pairs' }) ; nopC } -mkSRT :: HomeModules -> [Id] -> (Id,[Id]) -> Code -mkSRT hmods these (id,[]) = nopC -mkSRT hmods these (id,ids) +mkSRT :: [Id] -> (Id,[Id]) -> Code +mkSRT _ (_,[]) = nopC +mkSRT these (id,ids) = do { ids <- mapFCs remap ids ; id <- remap id - ; emitRODataLits (mkSRTLabel (idName id)) - (map (CmmLabel . mkClosureLabel hmods . idName) ids) + ; emitRODataLits "CodeGen.mkSRT" (mkSRTLabel (idName id) (idCafInfo id)) + (map (\id -> CmmLabel $ mkClosureLabel (idName id) (idCafInfo id)) ids) } where -- Sigh, better map all the ids against the environment in @@ -303,13 +190,14 @@ cgTopRhs :: Id -> StgRhs -> FCode (Id, CgIdInfo) -- The Id is passed along for setting up a binding... -- It's already been externalised if necessary -cgTopRhs bndr (StgRhsCon cc con args) +cgTopRhs bndr (StgRhsCon _cc con args) = forkStatics (cgTopRhsCon bndr con args) cgTopRhs bndr (StgRhsClosure cc bi fvs upd_flag srt args body) = ASSERT(null fvs) -- There should be no free variables - setSRTLabel (mkSRTLabel (idName bndr)) $ - forkStatics (cgTopRhsClosure bndr cc bi srt upd_flag args body) + setSRTLabel (mkSRTLabel (idName bndr) (idCafInfo bndr)) $ + setSRT srt $ + forkStatics (cgTopRhsClosure bndr cc bi upd_flag args body) \end{code} @@ -327,15 +215,15 @@ which refers to this name). maybeExternaliseId :: DynFlags -> Id -> FCode Id maybeExternaliseId dflags id | dopt Opt_SplitObjs dflags, -- Externalise the name for -split-objs - isInternalName name = do { mod <- moduleName + isInternalName name = do { mod <- getModuleName ; returnFC (setIdName id (externalise mod)) } | otherwise = returnFC id where - externalise mod = mkExternalName uniq mod new_occ Nothing loc + externalise mod = mkExternalName uniq mod new_occ loc name = idName id uniq = nameUnique name new_occ = mkLocalOcc uniq (nameOccName name) - loc = nameSrcLoc name + loc = nameSrcSpan name -- We want to conjure up a name that can't clash with any -- existing name. So we generate -- Mod_$L243foo