#include "HsVersions.h"
+import DriverState ( v_Build_tag, v_MainModIs )
+
-- Kludge (??) so that CgExpr is reached via at least one non-SOURCE
-- import. Before, that wasn't the case, and CM therefore didn't
-- bother to compile it.
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, emitRtsCall )
+
+import CLabel ( mkSRTLabel, mkClosureLabel, moduleRegdLabel,
+ mkPlainModuleInitLabel, mkModuleInitLabel )
+import Cmm
+import CmmUtils ( zeroCLit, mkIntCLit, mkLblExpr )
+import PprCmm ( pprCmms )
+import MachOp ( wordRep, MachHint(..) )
-import DriverState ( v_Build_tag, v_MainModIs )
import StgSyn
-import CgMonad
-import AbsCSyn
import PrelNames ( gHC_PRIM, rOOT_MAIN, mAIN_Name, pREL_TOP_HANDLER )
-import CLabel ( mkSRTLabel, mkClosureLabel,
- mkPlainModuleInitLabel, mkModuleInitLabel )
-import PprAbsC ( dumpRealC )
-import AbsCUtils ( mkAbstractCs, flattenAbsC )
-import CgBindery ( CgIdInfo, addBindC, addBindsC, getCAddrModeAndInfo )
-import CgClosure ( cgTopRhsClosure )
-import CgCon ( cgTopRhsCon )
-import CgConTbls ( genStaticConBits )
-import ClosureInfo ( mkClosureLFInfo )
-import CmdLineOpts ( DynFlags, DynFlag(..),
- opt_SccProfilingOn, opt_EnsureSplittableC )
+import CmdLineOpts ( DynFlags, DynFlag(..), opt_EnsureSplittableC,
+ opt_SccProfilingOn )
+
import HscTypes ( ForeignStubs(..), TypeEnv, typeEnvTyCons )
import CostCentre ( CollectedCCs )
import Id ( Id, idName, setIdName )
import Name ( nameSrcLoc, nameOccName, nameUnique, isInternalName, mkExternalName )
import OccName ( mkLocalOcc )
-import PrimRep ( PrimRep(..) )
import TyCon ( isDataTyCon )
import Module ( Module, mkModuleName )
-import BasicTypes ( TopLevelFlag(..) )
-import UniqSupply ( mkSplitUniqSupply )
import ErrUtils ( dumpIfSet_dyn, showPass )
-import Panic ( assertPanic )
+import Panic ( assertPanic, trace )
import qualified Module ( moduleName )
#ifdef DEBUG
-> [Module] -- directly-imported modules
-> CollectedCCs -- (Local/global) cost-centres needing declaring/registering.
-> [(StgBinding,[(Id,[Id])])] -- Bindings to convert, with SRTs
- -> IO AbstractC -- Output
+ -> IO [Cmm] -- Output
codeGen dflags this_mod type_env foreign_stubs imported_mods
cost_centre_info stg_binds
= do
- showPass dflags "CodeGen"
- fl_uniqs <- mkSplitUniqSupply 'f'
- way <- readIORef v_Build_tag
- mb_main_mod <- readIORef v_MainModIs
-
- let
- tycons = typeEnvTyCons type_env
- data_tycons = filter isDataTyCon tycons
-
- mapM_ (\x -> seq x (return ())) data_tycons
-
- let
-
- cinfo = MkCompInfo this_mod
-
- datatype_stuff = genStaticConBits cinfo data_tycons
- code_stuff = initC cinfo (mapCs cgTopBinding stg_binds)
- init_stuff = mkModuleInit way cost_centre_info
- this_mod mb_main_mod
- foreign_stubs imported_mods
-
- abstractC = mkAbstractCs [ maybeSplitCode,
- init_stuff,
- code_stuff,
- datatype_stuff]
+ { showPass dflags "CodeGen"
+ ; way <- readIORef v_Build_tag
+ ; mb_main_mod <- readIORef v_MainModIs
+
+ ; let tycons = typeEnvTyCons type_env
+ data_tycons = filter isDataTyCon tycons
+
+-- Why?
+-- ; mapM_ (\x -> seq x (return ())) data_tycons
+
+ ; code_stuff <- initC this_mod $ do
+ { cmm_binds <- mapM (getCmm . cgTopBinding) stg_binds
+ ; cmm_tycons <- mapM cgTyCon data_tycons
+ ; cmm_init <- getCmm (mkModuleInit way cost_centre_info
+ this_mod mb_main_mod
+ foreign_stubs imported_mods)
+ ; return (cmm_binds ++ concat cmm_tycons ++ [cmm_init])
+ }
-- 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
- dumpIfSet_dyn dflags Opt_D_dump_absC "Abstract C" (dumpRealC abstractC)
+ ; dumpIfSet_dyn dflags Opt_D_dump_cmm "Cmm" (pprCmms code_stuff)
- return $! flattenAbsC fl_uniqs abstractC
+ ; return code_stuff }
\end{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).
+
+ 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.
+ -------------------------------------------------------------------------- */
+
+We initialise the module tree by keeping a work-stack,
+ * pointed to by Sp
+ * that grows downward
+ * Sp points to the last occupied slot
+
+
\begin{code}
mkModuleInit
:: String -- the "way"
-> Maybe String -- Just m ==> we have flag: -main-is Foo.baz
-> ForeignStubs
-> [Module]
- -> AbstractC
+ -> Code
mkModuleInit way cost_centre_info this_mod mb_main_mod foreign_stubs imported_mods
- = let
- (cc_decls, cc_regs) = mkCostCentreStuff cost_centre_info
+ = do {
- register_foreign_exports
- = case foreign_stubs of
- NoStubs -> []
- ForeignStubs _ _ _ fe_bndrs -> map mk_export_register fe_bndrs
+ -- Allocate the static boolean that records if this
+ -- module has been registered already
+ ; emitData Data [CmmDataLabel moduleRegdLabel,
+ CmmStaticLit zeroCLit]
- mk_export_register bndr
- = CMacroStmt REGISTER_FOREIGN_EXPORT [lbl]
- where
- lbl = CLbl (mkClosureLabel (idName bndr)) PtrRep
- -- we don't want/need to init GHC.Prim, so filter it out
+ ; emitSimpleProc real_init_lbl $ do
+ { -- The return-code pops the work stack by
+ -- incrementing Sp, and then jumpd to the popped item
+ ret_blk <- forkLabelledCode $ stmtsC
+ [ CmmAssign spReg (cmmRegOffW spReg 1)
+ , CmmJump (CmmLoad (cmmRegOffW spReg (-1)) wordRep) [] ]
- mk_import_register mod
- | mod == gHC_PRIM = AbsCNop
- | otherwise = CMacroStmt REGISTER_IMPORT [
- CLbl (mkModuleInitLabel mod way) AddrRep
- ]
+ ; 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)
+ }
- extra_imported_mods
- | Module.moduleName this_mod == main_mod_name = [ pREL_TOP_HANDLER ]
- | otherwise = [ ]
- register_mod_imports =
- map mk_import_register (imported_mods ++ extra_imported_mods)
+ -- 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, Module.moduleName this_mod == main_mod_name)
-- 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
- main_mod_name = case mb_main_mod of
- Just mod_name -> mkModuleName mod_name
- Nothing -> mAIN_Name
- main_init_block
- | Module.moduleName this_mod /= main_mod_name
- = AbsCNop -- The normal case
- | otherwise -- this_mod contains the main function
- = CCodeBlock (mkPlainModuleInitLabel rOOT_MAIN)
- (CJump (CLbl (mkPlainModuleInitLabel this_mod) CodePtrRep))
-
- in
- mkAbstractCs [
- cc_decls,
- CModuleInitBlock (mkPlainModuleInitLabel this_mod)
- (mkModuleInitLabel this_mod way)
- (mkAbstractCs (register_foreign_exports ++
- cc_regs :
- register_mod_imports)),
- main_init_block
- ]
+ ; whenC (Module.moduleName this_mod == main_mod_name)
+ (emitSimpleProc plain_main_init_lbl jump_to_init)
+ }
+ where
+ plain_init_lbl = mkPlainModuleInitLabel this_mod
+ real_init_lbl = mkModuleInitLabel this_mod way
+ plain_main_init_lbl = mkPlainModuleInitLabel rOOT_MAIN
+
+ jump_to_init = stmtC (CmmJump (mkLblExpr real_init_lbl) [])
+
+ mod_reg_val = CmmLoad (mkLblExpr moduleRegdLabel) wordRep
+
+ main_mod_name = case mb_main_mod of
+ Just mod_name -> mkModuleName mod_name
+ Nothing -> mAIN_Name
+
+ -- Main refers to GHC.TopHandler.runIO, so make sure we call the
+ -- init function for GHC.TopHandler.
+ extra_imported_mods
+ | Module.moduleName this_mod == main_mod_name = [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
+ ; registerForeignExports foreign_stubs
+ ; initCostCentres cost_centre_info
+ ; mapCs (registerModuleImport way) (imported_mods++extra_imported_mods)
+ }
+
+
+-----------------------
+registerModuleImport :: String -> Module -> Code
+registerModuleImport 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 mod way)) ]
+
+-----------------------
+registerForeignExports :: ForeignStubs -> Code
+registerForeignExports NoStubs
+ = nopC
+registerForeignExports (ForeignStubs _ _ _ fe_bndrs)
+ = mapM_ mk_export_register fe_bndrs
+ where
+ mk_export_register bndr
+ = emitRtsCall SLIT("getStablePtr")
+ [ (CmmLit (CmmLabel (mkClosureLabel (idName bndr))), PtrHint) ]
\end{code}
+
+
Cost-centre profiling: Besides the usual stuff, we must produce
declarations for the cost-centres defined in this module;
code-generator.)
\begin{code}
-mkCostCentreStuff (local_CCs, extern_CCs, singleton_CCSs)
- | not opt_SccProfilingOn = (AbsCNop, AbsCNop)
- | otherwise =
- ( mkAbstractCs (
- map (CCostCentreDecl True) local_CCs ++
- map (CCostCentreDecl False) extern_CCs ++
- map CCostCentreStackDecl singleton_CCSs),
- mkAbstractCs (mkCcRegister local_CCs singleton_CCSs)
- )
- where
- mkCcRegister ccs cc_stacks
- = let
- register_ccs = mkAbstractCs (map mk_register ccs)
- register_cc_stacks = mkAbstractCs (map mk_register_ccs cc_stacks)
- in
- [ register_ccs, register_cc_stacks ]
- where
- mk_register cc
- = CCallProfCCMacro FSLIT("REGISTER_CC") [mkCCostCentre cc]
-
- mk_register_ccs ccs
- = CCallProfCCMacro FSLIT("REGISTER_CCS") [mkCCostCentreStack ccs]
+initCostCentres :: CollectedCCs -> Code
+-- Emit the declarations, and return code to register them
+initCostCentres (local_CCs, ___extern_CCs, singleton_CCSs)
+ | not opt_SccProfilingOn = nopC
+ | otherwise
+ = do { mapM_ emitCostCentreDecl local_CCs
+ ; mapM_ emitCostCentreStackDecl singleton_CCSs
+ ; mapM_ emitRegisterCC local_CCs
+ ; mapM_ emitRegisterCCS singleton_CCSs
+ }
\end{code}
%************************************************************************
\begin{code}
cgTopBinding :: (StgBinding,[(Id,[Id])]) -> Code
cgTopBinding (StgNonRec id rhs, srts)
- = absC maybeSplitCode `thenC`
- maybeExternaliseId id `thenFC` \ id' ->
- mapM_ (mkSRT [id']) srts `thenC`
- cgTopRhs id' rhs `thenFC` \ (id, info) ->
- addBindC id info `thenC`
- -- Add the un-externalised Id to the envt, so we
- -- find it when we look up occurrences
- nopC
+ = do { id' <- maybeExternaliseId id
+ ; 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 (StgRec pairs, srts)
- = absC maybeSplitCode `thenC`
- let
- (bndrs, rhss) = unzip pairs
- in
- mapFCs maybeExternaliseId bndrs `thenFC` \ bndrs' ->
- let
- pairs' = zip bndrs' rhss
- in
- mapM_ (mkSRT bndrs') srts `thenC`
- fixC (\ new_binds ->
- addBindsC new_binds `thenC`
- mapFCs ( \ (b,e) -> cgTopRhs b e ) pairs'
- ) `thenFC` \ new_binds ->
- nopC
+ = do { let (bndrs, rhss) = unzip pairs
+ ; bndrs' <- mapFCs maybeExternaliseId bndrs
+ ; let pairs' = zip bndrs' rhss
+ ; mapM_ (mkSRT bndrs') srts
+ ; new_binds <- fixC (\ new_binds -> do
+ { addBindsC new_binds
+ ; mapFCs ( \ (b,e) -> cgTopRhs b e ) pairs' })
+ ; nopC }
mkSRT :: [Id] -> (Id,[Id]) -> Code
mkSRT these (id,[]) = nopC
mkSRT these (id,ids)
- = mapFCs remap ids `thenFC` \ ids ->
- remap id `thenFC` \ id ->
- absC (CSRT (mkSRTLabel (idName id)) (map (mkClosureLabel . idName) ids))
+ = do { ids <- mapFCs remap ids
+ ; id <- remap id
+ ; emitRODataLits (mkSRTLabel (idName id))
+ (map (CmmLabel . mkClosureLabel . idName) ids)
+ }
where
- -- sigh, better map all the ids against the environment in case they've
- -- been externalised (see maybeExternaliseId below).
+ -- Sigh, better map all the ids against the environment in
+ -- case they've been externalised (see maybeExternaliseId below).
remap id = case filter (==id) these of
- [] -> getCAddrModeAndInfo id
- `thenFC` \ (id, _, _) -> returnFC id
(id':_) -> returnFC id'
+ [] -> do { info <- getCgIdInfo id; return (cgIdInfoId info) }
-- Urgh! I tried moving the forkStatics call from the rhss of cgTopRhs
-- to enclose the listFCs in cgTopBinding, but that tickled the
cgTopRhs bndr (StgRhsClosure cc bi fvs upd_flag srt args body)
= ASSERT(null fvs) -- There should be no free variables
- let
- srt_label = mkSRTLabel (idName bndr)
- lf_info = mkClosureLFInfo bndr TopLevel [{-no fvs-}] upd_flag args
- in
- setSRTLabel srt_label $
- forkStatics (cgTopRhsClosure bndr cc bi srt args body lf_info)
+ setSRTLabel (mkSRTLabel (idName bndr)) $
+ forkStatics (cgTopRhsClosure bndr cc bi srt upd_flag args body)
\end{code}
maybeExternaliseId :: Id -> FCode Id
maybeExternaliseId id
| opt_EnsureSplittableC, -- Externalise the name for -split-objs
- isInternalName name
- = moduleName `thenFC` \ mod ->
- returnFC (setIdName id (mkExternalName uniq mod new_occ Nothing (nameSrcLoc name)))
- | otherwise
- = returnFC id
+ isInternalName name = do { mod <- moduleName
+ ; returnFC (setIdName id (externalise mod)) }
+ | otherwise = returnFC id
where
- name = idName id
- uniq = nameUnique name
- new_occ = mkLocalOcc uniq (nameOccName name)
+ externalise mod = mkExternalName uniq mod new_occ Nothing loc
+ name = idName id
+ uniq = nameUnique name
+ new_occ = mkLocalOcc uniq (nameOccName name)
+ loc = nameSrcLoc name
-- We want to conjure up a name that can't clash with any
-- existing name. So we generate
-- Mod_$L243foo
-- where 243 is the unique.
-
-maybeSplitCode
- | opt_EnsureSplittableC = CSplitMarker
- | otherwise = AbsCNop
\end{code}
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