%
+% (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
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, gHC_TOP_HANDLER )
-import DynFlags ( DynFlags(..), DynFlag(..), dopt )
-import StaticFlags ( opt_SccProfilingOn )
-
-import PackageConfig ( PackageId )
-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 )
-
-#ifdef DEBUG
-import Panic ( assertPanic )
-#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
-> 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 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 this_mod $ do
{ cmm_binds <- mapM (getCmm . cgTopBinding dflags) stg_binds
; cmm_tycons <- mapM cgTyCon data_tycons
- ; cmm_init <- getCmm (mkModuleInit dflags 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
- -> String -- the "way"
- -> CollectedCCs -- cost centre info
- -> Module
- -> Module -- name of the Main module
- -> ForeignStubs
- -> [Module]
- -> Code
-mkModuleInit dflags 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
- this_pkg = thisPackage dflags
-
- plain_init_lbl = mkPlainModuleInitLabel this_pkg this_mod
- real_init_lbl = mkModuleInitLabel this_pkg this_mod way
- plain_main_init_lbl = mkPlainModuleInitLabel this_pkg 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 = [gHC_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 this_pkg 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 :: PackageId -> String -> Module -> Code
-registerModuleImport this_pkg 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 this_pkg mod way)) ]
\end{code}
| otherwise
= do { mapM_ emitCostCentreDecl local_CCs
; mapM_ emitCostCentreStackDecl singleton_CCSs
- ; mapM_ emitRegisterCC local_CCs
- ; mapM_ emitRegisterCCS singleton_CCSs
- }
+ }
\end{code}
%************************************************************************
cgTopBinding :: DynFlags -> (StgBinding,[(Id,[Id])]) -> Code
cgTopBinding dflags (StgNonRec id rhs, srts)
= do { id' <- maybeExternaliseId dflags id
- ; mapM_ (mkSRT (thisPackage dflags) [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
= do { let (bndrs, rhss) = unzip pairs
; bndrs' <- mapFCs (maybeExternaliseId dflags) bndrs
; let pairs' = zip bndrs' rhss
- ; mapM_ (mkSRT (thisPackage dflags) bndrs') srts
+ ; mapM_ (mkSRT bndrs') srts
; _new_binds <- fixC (\ new_binds -> do
{ addBindsC new_binds
; mapFCs ( \ (b,e) -> cgTopRhs b e ) pairs' })
; nopC }
-mkSRT :: PackageId -> [Id] -> (Id,[Id]) -> Code
-mkSRT this_pkg these (id,[]) = nopC
-mkSRT this_pkg 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 this_pkg . 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
-- 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}
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
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
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