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Clear the mi_globals field when generating an iface #3414

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Merged
merged 5 commits into from
Dec 21, 2022
Merged

Clear the mi_globals field when generating an iface #3414

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8efbf77
Clear the mi_globals field when generating an iface
wz1000 Dec 20, 2022
47e2d6e
Merge branch 'master' into wip/clear_mi_globals
wz1000 Dec 21, 2022
c4a1d95
Merge branch 'master' into wip/clear_mi_globals
wz1000 Dec 21, 2022
7d22f3d
Merge branch 'master' into wip/clear_mi_globals
wz1000 Dec 21, 2022
87f51d4
Merge branch 'master' into wip/clear_mi_globals
mergify[bot] Dec 21, 2022
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17 changes: 14 additions & 3 deletions ghcide/src/Development/IDE/Core/Compile.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -427,14 +427,24 @@ tcRnModule hsc_env tc_helpers pmod = do
tc_gbl_env = tc_gbl_env' { tcg_ann_env = extendAnnEnvList (tcg_ann_env tc_gbl_env') mod_env_anns }
pure (TcModuleResult pmod rn_info tc_gbl_env splices False mod_env)


-- Note [Clearing mi_globals after generating an iface]
-- GHC populates the mi_global field in interfaces for GHCi if we are using the bytecode
-- interpreter.
-- However, this field is expensive in terms of heap usage, and we don't use it in HLS
-- anywhere. So we zero it out.
-- The field is not serialized or deserialised from disk, so we don't need to remove it
-- while reading an iface from disk, only if we just generated an iface in memory

mkHiFileResultNoCompile :: HscEnv -> TcModuleResult -> IO HiFileResult
mkHiFileResultNoCompile session tcm = do
let hsc_env_tmp = hscSetFlags (ms_hspp_opts ms) session
ms = pm_mod_summary $ tmrParsed tcm
tcGblEnv = tmrTypechecked tcm
details <- makeSimpleDetails hsc_env_tmp tcGblEnv
sf <- finalSafeMode (ms_hspp_opts ms) tcGblEnv
iface <- mkIfaceTc hsc_env_tmp sf details ms tcGblEnv
iface' <- mkIfaceTc hsc_env_tmp sf details ms tcGblEnv
let iface = iface' { mi_globals = Nothing } -- See Note [Clearing mi_globals after generating an iface]
pure $! mkHiFileResult ms iface details (tmrRuntimeModules tcm) Nothing

mkHiFileResultCompile
Expand Down Expand Up @@ -467,15 +477,16 @@ mkHiFileResultCompile se session' tcm simplified_guts = catchErrs $ do
#endif
simplified_guts

final_iface <- mkFullIface session partial_iface Nothing
final_iface' <- mkFullIface session partial_iface Nothing
#if MIN_VERSION_ghc(9,4,2)
Nothing
#endif

#else
let !partial_iface = force (mkPartialIface session details simplified_guts)
final_iface <- mkFullIface session partial_iface
final_iface' <- mkFullIface session partial_iface
#endif
let final_iface = final_iface' {mi_globals = Nothing} -- See Note [Clearing mi_globals after generating an iface]

-- Write the core file now
core_file <- case mguts of
Expand Down