HsBindGroup(..), LRuleDecl, HsBind(..) )
import TcRnTypes ( TcGblEnv(..), ImportAvails(..) )
import MkIface ( mkUsageInfo )
-import Id ( Id, setIdLocalExported, idName )
+import Id ( Id, setIdLocalExported, idName, idIsFrom, isLocalId )
import Name ( Name, isExternalName )
import CoreSyn
import PprCore ( pprIdRules, pprCoreExpr )
tcg_dus = dus,
tcg_inst_uses = dfun_uses_var,
tcg_th_used = th_var,
+ tcg_keep = keep_var,
tcg_rdr_env = rdr_env,
tcg_fix_env = fix_env,
tcg_deprecs = deprecs,
+ tcg_binds = binds,
+ tcg_fords = fords,
+ tcg_rules = rules,
tcg_insts = insts })
= do { showPass dflags "Desugar"
- -- Do desugaring
- ; (results, warnings) <- initDs hsc_env mod type_env $
- dsProgram ghci_mode tcg_env
+ -- Desugar the program
+ ; ((all_prs, ds_rules, ds_fords), warns)
+ <- initDs hsc_env mod rdr_env type_env $ do
+ { core_prs <- dsHsBinds auto_scc binds []
+ ; (ds_fords, foreign_prs) <- dsForeigns fords
+ ; let all_prs = foreign_prs ++ core_prs
+ local_bndrs = mkVarSet (map fst all_prs)
+ ; ds_rules <- mappM (dsRule mod local_bndrs) rules
+ ; return (all_prs, ds_rules, ds_fords) }
+
- ; let { (ds_binds, ds_rules, ds_fords) = results
- ; warns = mapBag mk_warn warnings
- }
-- If warnings are considered errors, leave.
; if errorsFound dflags (warns, emptyBag)
then return (warns, Nothing)
else do
+ { -- Add export flags to bindings
+ keep_alive <- readIORef keep_var
+ ; let final_prs = addExportFlags ghci_mode exports keep_alive
+ all_prs ds_rules
+ ds_binds = [Rec final_prs]
+ -- Notice that we put the whole lot in a big Rec, even the foreign binds
+ -- When compiling PrelFloat, which defines data Float = F# Float#
+ -- we want F# to be in scope in the foreign marshalling code!
+ -- You might think it doesn't matter, but the simplifier brings all top-level
+ -- things into the in-scope set before simplifying; so we get no unfolding for F#!
+
-- Lint result if necessary
- { endPass dflags "Desugar" Opt_D_dump_ds ds_binds
+ ; endPass dflags "Desugar" Opt_D_dump_ds ds_binds
-- Dump output
; doIfSet (dopt Opt_D_dump_ds dflags)
(printDump (ppr_ds_rules ds_rules))
; dfun_uses <- readIORef dfun_uses_var -- What dfuns are used
- ; th_used <- readIORef th_var
+ ; th_used <- readIORef th_var -- Whether TH is used
; let used_names = allUses dus `unionNameSets` dfun_uses
pkgs | th_used = insertList thPackage (imp_dep_pkgs imports)
| otherwise = imp_dep_pkgs imports
where
dflags = hsc_dflags hsc_env
ghci_mode = hsc_mode hsc_env
- print_unqual = unQualInScope rdr_env
-
- -- Desugarer warnings are SDocs; here we
- -- add the info about whether or not to print unqualified
- mk_warn :: (SrcSpan,SDoc) -> WarnMsg
- mk_warn (loc, sdoc) = mkWarnMsg loc print_unqual sdoc
-
+ auto_scc | opt_SccProfilingOn = TopLevel
+ | otherwise = NoSccs
deSugarExpr :: HscEnv
-> Module -> GlobalRdrEnv -> TypeEnv
; us <- mkSplitUniqSupply 'd'
-- Do desugaring
- ; (core_expr, ds_warns) <- initDs hsc_env this_mod type_env $
+ ; (core_expr, ds_warns) <- initDs hsc_env this_mod rdr_env type_env $
dsLExpr tc_expr
-- Display any warnings
-- Note: if -Werror is used, we don't signal an error here.
; doIfSet (not (isEmptyBag ds_warns))
- (printErrs (pprBagOfWarnings (mapBag mk_warn ds_warns)))
+ (printErrs (pprBagOfWarnings ds_warns))
-- Dump output
; dumpIfSet_dyn dflags Opt_D_dump_ds "Desugared" (pprCoreExpr core_expr)
}
where
dflags = hsc_dflags hsc_env
- print_unqual = unQualInScope rdr_env
-
- mk_warn :: (SrcSpan,SDoc) -> WarnMsg
- mk_warn (loc,sdoc) = mkWarnMsg loc print_unqual sdoc
-dsProgram ghci_mode (TcGblEnv { tcg_exports = exports,
- tcg_keep = keep_alive,
- tcg_binds = binds,
- tcg_fords = fords,
- tcg_rules = rules })
- = dsHsBinds auto_scc binds [] `thenDs` \ core_prs ->
- dsForeigns fords `thenDs` \ (ds_fords, foreign_prs) ->
- let
- all_prs = foreign_prs ++ core_prs
- local_bndrs = mkVarSet (map fst all_prs)
- in
- mappM (dsRule local_bndrs) rules `thenDs` \ ds_rules ->
- let
- final_prs = addExportFlags ghci_mode exports keep_alive
- local_bndrs all_prs ds_rules
- ds_binds = [Rec final_prs]
- -- Notice that we put the whole lot in a big Rec, even the foreign binds
- -- When compiling PrelFloat, which defines data Float = F# Float#
- -- we want F# to be in scope in the foreign marshalling code!
- -- You might think it doesn't matter, but the simplifier brings all top-level
- -- things into the in-scope set before simplifying; so we get no unfolding for F#!
- in
- returnDs (ds_binds, ds_rules, ds_fords)
- where
- auto_scc | opt_SccProfilingOn = TopLevel
- | otherwise = NoSccs
-
-- addExportFlags
-- Set the no-discard flag if either
-- a) the Id is exported
-- it's just because the type checker is rather busy already and
-- I didn't want to pass in yet another mapping.
-addExportFlags ghci_mode exports keep_alive bndrs prs rules
+addExportFlags ghci_mode exports keep_alive prs rules
= [(add_export bndr, rhs) | (bndr,rhs) <- prs]
where
- add_export bndr | dont_discard bndr = setIdLocalExported bndr
- | otherwise = bndr
+ add_export bndr
+ | isLocalId bndr && dont_discard bndr = setIdLocalExported bndr
+ -- The isLocalId check is to avoid fiddling with
+ -- locally-defined Ids like data cons and class ops
+ -- which are "born" as GlobalIds
+ | otherwise = bndr
orph_rhs_fvs = unionVarSets [ ruleRhsFreeVars rule
- | (id, rule) <- rules,
- not (id `elemVarSet` bndrs) ]
- -- An orphan rule must keep alive the free vars
- -- of its right-hand side.
- -- Non-orphan rules are attached to the Id (bndr_with_rules above)
- -- and that keeps the rhs free vars alive
+ | IdCoreRule _ is_orphan_rule rule <- rules,
+ is_orphan_rule ]
+ -- An orphan rule keeps alive the free vars of its right-hand side.
+ -- Non-orphan rules are (later, after gentle simplification)
+ -- attached to the Id and that keeps the rhs free vars alive
dont_discard bndr = is_exported name
|| name `elemNameSet` keep_alive
%************************************************************************
\begin{code}
-dsRule :: IdSet -> LRuleDecl Id -> DsM (Id, CoreRule)
-dsRule in_scope (L loc (HsRule name act vars lhs rhs))
+dsRule :: Module -> IdSet -> LRuleDecl Id -> DsM IdCoreRule
+dsRule mod in_scope (L loc (HsRule name act vars lhs rhs))
= putSrcSpanDs loc $
ds_lhs all_vars lhs `thenDs` \ (fn, args) ->
dsLExpr rhs `thenDs` \ core_rhs ->
- returnDs (fn, Rule name act tpl_vars args core_rhs)
+ returnDs (IdCoreRule fn (is_orphan fn) (Rule name act tpl_vars args core_rhs))
where
- tpl_vars = [var | RuleBndr (L _ var) <- vars]
- all_vars = mkInScopeSet (extendVarSetList in_scope tpl_vars)
+ tpl_vars = [var | RuleBndr (L _ var) <- vars]
+ all_vars = mkInScopeSet (extendVarSetList in_scope tpl_vars)
+ is_orphan id = not (idIsFrom mod id)
+ -- NB we can't use isLocalId in the orphan test,
+ -- because isLocalId isn't true of class methods
ds_lhs all_vars lhs
= let
other -> (emptyBag, lhs)
in
mappM ds_dict_bind (bagToList dict_binds) `thenDs` \ dict_binds' ->
- dsLExpr body `thenDs` \ body' ->
+ dsLExpr body `thenDs` \ body' ->
-- Substitute the dict bindings eagerly,
-- and take the body apart into a (f args) form
projects / ghc-hetmet.git / blobdiff