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<p class="msipheader7557e74b" align="Left" style="margin:0"><span style="font-size:9.0pt;font-family:Arial;color:#317100">PUBLIC</span></p>
<br>
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Is there a migration guide for GHC API clients for the new “multiple home units” feature?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">In particular, I have the following two functions in my code that used to interact with related features of GHC:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console"">addUnit :: UnitInfo -> HscEnv -> HscEnv<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console"">addUnit <a href="mailto:unitInfo@GenericUnitInfo%7b..%7d">
unitInfo@GenericUnitInfo{..}</a> = modifyUnitState $ \us -> us<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> { packageNameMap = addToUFM (packageNameMap us) unitPackageName unitId<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> , unitInfoMap = M.insert unitId unitInfo $ unitInfoMap us<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console"">registerModule :: (GhcMonad m) => ModDetails -> ModIface -> m ()<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console"">registerModule details iface = modifySession $ extendHpt . addModule<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> where<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> hmi = HomeModInfo iface details Nothing<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> mod = mi_module iface<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> modOrig = ModOrigin (Just True) [] [] True<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> addModule = modifyUnitState $ \us -> us<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> { moduleNameProvidersMap = M.insert (moduleName mod) (M.singleton mod modOrig) $ moduleNameProvidersMap us<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> extendHpt env = env<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> { hsc_unit_env = let ue = hsc_unit_env env in ue<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> { ue_hpt = addHomeModInfoToHpt hmi (hsc_HPT env)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I implemented these using the following utility function:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console"">modifyUnitState :: (UnitState -> UnitState) -> HscEnv -> HscEnv<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console"">modifyUnitState f env = env<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> { hsc_unit_env = let ue = hsc_unit_env env in ue<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> { ue_units = f (ue_units ue)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">With the recent changes to GHC, `modifyUnitState` doesn’t work anymore because there is no single `UnitEnv` in the `HscEnv`. I tried updating the `HomeUnitEnv` of the current
unit:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console"">modifyUnitState :: (UnitState -> UnitState) -> HscEnv -> HscEnv<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console"">modifyUnitState f env = env<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> { hsc_unit_env = let ue = hsc_unit_env env in<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> ue_updateHomeUnitEnv f' (ue_currentUnit ue) ue<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> where<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> f' hue = let units = homeUnitEnv_units hue in hue<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> { homeUnitEnv_units = f units<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">but this leads to a panic:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console""> GHC version 9.5.20220613:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console""> Unit unknown to the internal unit environment<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console"">unit (cortex-prim)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console"">pprInternalUnitMap<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console""> main (flags: main, Just main) -><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console"">Call stack:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console""> CallStack (from HasCallStack):<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console""> callStackDoc, called at compiler/GHC/Utils/Panic.hs:182:37 in ghc-lib-0.20220613-HQTH0nHhxeOCnJy5jYkZiX:GHC.Utils.Panic<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console""> pprPanic, called at compiler/GHC/Unit/Env.hs:450:14 in ghc-lib-0.20220613-HQTH0nHhxeOCnJy5jYkZiX:GHC.Unit.Env<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console""> ue_findHomeUnitEnv, called at compiler/GHC/Unit/Env.hs:394:48 in ghc-lib-0.20220613-HQTH0nHhxeOCnJy5jYkZiX:GHC.Unit.Env<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console""> ue_unitFlags, called at compiler/GHC/Driver/Env.hs:421:18 in ghc-lib-0.20220613-HQTH0nHhxeOCnJy5jYkZiX:GHC.Driver.Env<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Lucida Console""> hscSetActiveUnitId, called at compiler/GHC/Driver/Env.hs:416:34 in ghc-lib-0.20220613-HQTH0nHhxeOCnJy5jYkZiX:GHC.Driver.Env<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""> hscSetActiveHomeUnit, called at compiler/GHC/Driver/Make.hs:1853:15 in ghc-lib-0.20220613-HQTH0nHhxeOCnJy5jYkZiX:GHC.Driver.Make<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Lucida Console""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">What is the new way of registering a new unit or new module with GHC?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"> Gergo<o:p></o:p></span></p>
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