Cheng Shao pushed to branch wip/sptentry-use-name at Glasgow Haskell Compiler / GHC Commits: c4ab3b82 by Cheng Shao at 2025-08-13T01:05:04+02:00 compiler: only use `Name` instead of `Id` in `SptEntry` As a part of #26298, this patch refactors `SptEntry` to only carry a `Name` instead of `Id`: we do not care about extra information like caffyness or type at all in any static pointer related codegen logic. This is necessary to make `SptEntry` serializable, as a part of the grand plan of serializable bytecode. Co-authored-by: Codex - - - - - 4 changed files: - compiler/GHC/Driver/Main.hs - compiler/GHC/Iface/Tidy/StaticPtrTable.hs - compiler/GHC/StgToJS/StaticPtr.hs - compiler/GHC/Types/SptEntry.hs Changes: ===================================== compiler/GHC/Driver/Main.hs ===================================== @@ -2547,9 +2547,9 @@ hscAddSptEntries :: HscEnv -> [SptEntry] -> IO () hscAddSptEntries hsc_env entries = do let interp = hscInterp hsc_env let add_spt_entry :: SptEntry -> IO () - add_spt_entry (SptEntry i fpr) = do + add_spt_entry (SptEntry n fpr) = do -- These are only names from the current module - (val, _, _) <- loadName interp hsc_env (idName i) + (val, _, _) <- loadName interp hsc_env n addSptEntry interp fpr val mapM_ add_spt_entry entries ===================================== compiler/GHC/Iface/Tidy/StaticPtrTable.hs ===================================== @@ -144,6 +144,7 @@ import GHC.Utils.Outputable as Outputable import GHC.Linker.Types import GHC.Types.Id +import GHC.Types.Id.Info ( CafInfo(..) ) import GHC.Types.ForeignStubs import GHC.Data.Maybe import GHC.Data.FastString @@ -205,7 +206,7 @@ sptCreateStaticBinds opts this_mod binds = do Nothing -> return (Nothing, (b, e)) Just (_, t, info, arg) -> do (fp, e') <- mkStaticBind t info arg - return (Just (SptEntry b fp), (b, foldr Lam e' tvs)) + return (Just (SptEntry (idName b) fp), (b, foldr Lam e' tvs)) mkStaticBind :: Type -> CoreExpr -> CoreExpr -> StateT Int IO (Fingerprint, CoreExpr) @@ -256,12 +257,14 @@ sptModuleInitCode platform this_mod entries init_fn_body = vcat [ text "static StgWord64 k" <> int i <> text "[2] = " <> pprFingerprint fp <> semi + -- MayHaveCafRefs/NoCafRefs wouldn't make any difference here, + -- they doesn't affect the pretty-printed CLabel $$ text "extern StgPtr " - <> (pprCLabel platform $ mkClosureLabel (idName n) (idCafInfo n)) <> semi + <> (pprCLabel platform $ mkClosureLabel n MayHaveCafRefs) <> semi $$ text "hs_spt_insert" <> parens (hcat $ punctuate comma [ char 'k' <> int i - , char '&' <> pprCLabel platform (mkClosureLabel (idName n) (idCafInfo n)) + , char '&' <> pprCLabel platform (mkClosureLabel n MayHaveCafRefs) ] ) <> semi ===================================== compiler/GHC/StgToJS/StaticPtr.hs ===================================== @@ -9,20 +9,35 @@ import GHC.Prelude import GHC.Linker.Types (SptEntry(..)) import GHC.Fingerprint.Type import GHC.Types.Literal +import GHC.Types.Name import GHC.JS.JStg.Syntax import GHC.JS.Make +import GHC.JS.Ident (name) import GHC.StgToJS.Symbols -import GHC.StgToJS.Ids import GHC.StgToJS.Literal import GHC.StgToJS.Types +import GHC.Utils.Panic (panic) initStaticPtrs :: [SptEntry] -> G JStgStat initStaticPtrs ptrs = mconcat <$> mapM initStatic ptrs where - initStatic (SptEntry sp_id (Fingerprint w1 w2)) = do - i <- varForId sp_id + -- Build a reference to the closure variable for a top-level Name. + -- Static pointer bindings are exported, so we can construct the symbol + -- directly from the Name's module and OccName. + varForName :: Name -> G JStgExpr + varForName n = do + case nameModule_maybe n of + Just m -> do + let sym = mkJsSymbol True m (occNameMangledFS (nameOccName n)) + pure (ValExpr (JVar (name sym))) + Nothing -> + -- Shouldn't happen for SPT entries + panic "varForName: non-external Name in SptEntry" + + initStatic (SptEntry sp_name (Fingerprint w1 w2)) = do + i <- varForName sp_name fpa <- concat <$> mapM (genLit . mkLitWord64 . fromIntegral) [w1,w2] let sptInsert = ApplStat hdHsSptInsert (fpa ++ [i]) return $ (hdInitStatic .^ "push") `ApplStat` [Func [] sptInsert] ===================================== compiler/GHC/Types/SptEntry.hs ===================================== @@ -3,14 +3,13 @@ module GHC.Types.SptEntry ) where -import GHC.Types.Var ( Id ) +import GHC.Types.Name ( Name ) import GHC.Fingerprint.Type ( Fingerprint ) import GHC.Utils.Outputable -- | An entry to be inserted into a module's static pointer table. -- See Note [Grand plan for static forms] in "GHC.Iface.Tidy.StaticPtrTable". -data SptEntry = SptEntry Id Fingerprint +data SptEntry = SptEntry !Name !Fingerprint instance Outputable SptEntry where - ppr (SptEntry id fpr) = ppr id <> colon <+> ppr fpr - + ppr (SptEntry n fpr) = ppr n <> colon <+> ppr fpr View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c4ab3b82943744e264a962c0cc03d2e0... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/c4ab3b82943744e264a962c0cc03d2e0... 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