#include "HsVersions.h"
-import CmdLineOpts ( CoreToDo(..), SimplifierSwitch(..), SimplifierMode(..),
- DynFlags, DynFlag(..), dopt, dopt_CoreToDo
+import CmdLineOpts ( CoreToDo(..), SimplifierSwitch(..),
+ SimplifierMode(..), DynFlags, DynFlag(..), dopt,
+ dopt_CoreToDo
)
import CoreSyn
import CoreFVs ( ruleRhsFreeVars )
-import HscTypes ( PersistentCompilerState(..),
- PackageRuleBase, HomeSymbolTable, IsExported, ModDetails(..)
+import HscTypes ( HscEnv(..), GhciMode(..),
+ ModGuts(..), ModGuts, Avails, availsToNameSet,
+ PackageRuleBase, HomePackageTable, ModDetails(..),
+ HomeModInfo(..)
)
import CSE ( cseProgram )
import Rules ( RuleBase, emptyRuleBase, ruleBaseFVs, ruleBaseIds,
extendRuleBaseList, addRuleBaseFVs, pprRuleBase,
ruleCheckProgram )
import Module ( moduleEnvElts )
+import Name ( Name, isExternalName )
+import NameSet ( elemNameSet )
import PprCore ( pprCoreBindings, pprCoreExpr )
import OccurAnal ( occurAnalyseBinds, occurAnalyseGlobalExpr )
import CoreUtils ( coreBindsSize )
import CoreLint ( endPass )
import FloatIn ( floatInwards )
import FloatOut ( floatOutwards )
-import Id ( idName, setIdLocalExported, isImplicitId )
+import Id ( idName, setIdLocalExported )
import VarSet
import LiberateCase ( liberateCase )
import SAT ( doStaticArgs )
import Specialise ( specProgram)
import SpecConstr ( specConstrProgram)
-import UsageSPInf ( doUsageSPInf )
-import StrictAnal ( saBinds )
import DmdAnal ( dmdAnalPgm )
import WorkWrap ( wwTopBinds )
+#ifdef OLD_STRICTNESS
+import StrictAnal ( saBinds )
import CprAnalyse ( cprAnalyse )
+#endif
import UniqSupply ( UniqSupply, mkSplitUniqSupply, splitUniqSupply )
import IO ( hPutStr, stderr )
%************************************************************************
\begin{code}
-core2core :: DynFlags -- includes spec of what core-to-core passes to do
- -> PersistentCompilerState
- -> HomeSymbolTable
- -> IsExported
- -> ModDetails
- -> IO ModDetails
-
-core2core dflags pcs hst is_exported
- mod_details@(ModDetails { md_binds = binds_in, md_rules = rules_in })
+core2core :: HscEnv
+ -> PackageRuleBase
+ -> ModGuts
+ -> IO ModGuts
+
+core2core hsc_env pkg_rule_base
+ mod_impl@(ModGuts { mg_exports = exports,
+ mg_binds = binds_in,
+ mg_rules = rules_in })
= do
- let core_todos = dopt_CoreToDo dflags
- let pkg_rule_base = pcs_rules pcs -- Rule-base accumulated from imported packages
-
+ let dflags = hsc_dflags hsc_env
+ hpt = hsc_HPT hsc_env
+ ghci_mode = hsc_mode hsc_env
+ core_todos = dopt_CoreToDo dflags
us <- mkSplitUniqSupply 's'
let (cp_us, ru_us) = splitUniqSupply us
-- COMPUTE THE RULE BASE TO USE
(rule_base, local_rule_ids, orphan_rules, rule_rhs_fvs)
- <- prepareRules dflags pkg_rule_base hst ru_us binds_in rules_in
+ <- prepareRules dflags pkg_rule_base hpt ru_us binds_in rules_in
-- PREPARE THE BINDINGS
- let binds1 = updateBinders local_rule_ids rule_rhs_fvs is_exported binds_in
+ let binds1 = updateBinders ghci_mode local_rule_ids
+ rule_rhs_fvs exports binds_in
-- DO THE BUSINESS
(stats, processed_binds)
-- Return results
-- We only return local orphan rules, i.e., local rules not attached to an Id
-- The bindings cotain more rules, embedded in the Ids
- return (mod_details { md_binds = processed_binds, md_rules = orphan_rules})
+ return (mod_impl { mg_binds = processed_binds, mg_rules = orphan_rules})
simplifyExpr :: DynFlags -- includes spec of what core-to-core passes to do
- -> PersistentCompilerState
- -> HomeSymbolTable
-> CoreExpr
-> IO CoreExpr
-- simplifyExpr is called by the driver to simplify an
-- expression typed in at the interactive prompt
-simplifyExpr dflags pcs hst expr
+simplifyExpr dflags expr
= do {
; showPass dflags "Simplify"
; us <- mkSplitUniqSupply 's'
- ; let env = emptySimplEnv (SimplPhase 0) [] emptyVarSet
+ ; let env = emptySimplEnv SimplGently [] emptyVarSet
(expr', _counts) = initSmpl dflags us (simplExprGently env expr)
; dumpIfSet_dyn dflags Opt_D_dump_simpl "Simplified expression"
doCorePass dfs rb us binds CoreDoStaticArgs
= _scc_ "StaticArgs" noStats dfs (doStaticArgs us binds)
doCorePass dfs rb us binds CoreDoStrictness
- = _scc_ "Stranal" noStats dfs (do { binds1 <- saBinds dfs binds ;
- dmdAnalPgm dfs binds1 })
+ = _scc_ "Stranal" noStats dfs (dmdAnalPgm dfs binds)
doCorePass dfs rb us binds CoreDoWorkerWrapper
= _scc_ "WorkWrap" noStats dfs (wwTopBinds dfs us binds)
doCorePass dfs rb us binds CoreDoSpecialising
= _scc_ "Specialise" noStats dfs (specProgram dfs us binds)
doCorePass dfs rb us binds CoreDoSpecConstr
= _scc_ "SpecConstr" noStats dfs (specConstrProgram dfs us binds)
-doCorePass dfs rb us binds CoreDoCPResult
- = _scc_ "CPResult" noStats dfs (cprAnalyse dfs binds)
+#ifdef OLD_STRICTNESS
+doCorePass dfs rb us binds CoreDoOldStrictness
+ = _scc_ "OldStrictness" noStats dfs (doOldStrictness dfs binds)
+#endif
doCorePass dfs rb us binds CoreDoPrintCore
= _scc_ "PrintCore" noStats dfs (printCore binds)
-doCorePass dfs rb us binds CoreDoUSPInf
- = _scc_ "CoreUsageSPInf" noStats dfs (doUsageSPInf dfs us binds)
doCorePass dfs rb us binds CoreDoGlomBinds
= noStats dfs (glomBinds dfs binds)
doCorePass dfs rb us binds (CoreDoRuleCheck phase pat)
doCorePass dfs rb us binds CoreDoNothing
= noStats dfs (return binds)
+#ifdef OLD_STRICTNESS
+doOldStrictness dfs binds
+ = do binds1 <- saBinds dfs binds
+ binds2 <- cprAnalyse dfs binds1
+ return binds2
+#endif
+
printCore binds = do dumpIfSet True "Print Core"
(pprCoreBindings binds)
return binds
-- so that the opportunity to apply the rule isn't lost too soon
\begin{code}
-prepareRules :: DynFlags -> PackageRuleBase -> HomeSymbolTable
+prepareRules :: DynFlags -> PackageRuleBase -> HomePackageTable
-> UniqSupply
-> [CoreBind]
-> [IdCoreRule] -- Local rules
[IdCoreRule], -- Orphan rules
IdSet) -- RHS free vars of all rules
-prepareRules dflags pkg_rule_base hst us binds local_rules
+prepareRules dflags pkg_rule_base hpt us binds local_rules
= do { let env = emptySimplEnv SimplGently [] local_ids
(better_rules,_) = initSmpl dflags us (mapSmpl (simplRule env) local_rules)
rule_rhs_fvs = unionVarSets (map (ruleRhsFreeVars . snd) better_rules)
local_rule_base = extendRuleBaseList emptyRuleBase local_rules
local_rule_ids = ruleBaseIds local_rule_base -- Local Ids with rules attached
- imp_rule_base = foldl add_rules pkg_rule_base (moduleEnvElts hst)
+ imp_rule_base = foldl add_rules pkg_rule_base (moduleEnvElts hpt)
rule_base = extendRuleBaseList imp_rule_base orphan_rules
final_rule_base = addRuleBaseFVs rule_base (ruleBaseFVs local_rule_base)
-- The last step black-lists the free vars of local rules too
; return (final_rule_base, local_rule_ids, orphan_rules, rule_rhs_fvs)
}
where
- add_rules rule_base mds = extendRuleBaseList rule_base (md_rules mds)
+ add_rules rule_base mod_info = extendRuleBaseList rule_base (md_rules (hm_details mod_info))
-- Boringly, we need to gather the in-scope set.
local_ids = foldr (unionVarSet . mkVarSet . bindersOf) emptyVarSet binds
-updateBinders :: IdSet -- Locally defined ids with their Rules attached
+updateBinders :: GhciMode
+ -> IdSet -- Locally defined ids with their Rules attached
-> IdSet -- Ids free in the RHS of local rules
- -> IsExported
+ -> Avails -- What is exported
-> [CoreBind] -> [CoreBind]
-- A horrible function
-- Update the binders of top-level bindings as follows
-- a) Attach the rules for each locally-defined Id to that Id.
-- b) Set the no-discard flag if either the Id is exported,
--- or it's mentoined in the RHS of a rule
+-- or it's mentioned in the RHS of a rule
+--
+-- You might wonder why exported Ids aren't already marked as such;
+-- it's just because the type checker is rather busy already and
+-- I didn't want to pass in yet another mapping.
--
-- Reason for (a)
-- - It makes the rules easier to look up
-- the rules (maybe we should?), so this substitution would make the rule
-- bogus.
-updateBinders rule_ids rule_rhs_fvs is_exported binds
+updateBinders ghci_mode rule_ids rule_rhs_fvs exports binds
= map update_bndrs binds
where
update_bndrs (NonRec b r) = NonRec (update_bndr b) r
update_bndrs (Rec prs) = Rec [(update_bndr b, r) | (b,r) <- prs]
update_bndr bndr
- | isImplicitId bndr = bndr -- Constructors, selectors; doesn't
- -- make sense to call setIdLocalExported
- -- Also can't have rules
| dont_discard bndr = setIdLocalExported bndr_with_rules
| otherwise = bndr_with_rules
where
dont_discard bndr = is_exported (idName bndr)
|| bndr `elemVarSet` rule_rhs_fvs
+
+ -- In interactive mode, we don't want to discard any top-level
+ -- entities at all (eg. do not inline them away during
+ -- simplification), and retain them all in the TypeEnv so they are
+ -- available from the command line.
+ --
+ -- isExternalName separates the user-defined top-level names from those
+ -- introduced by the type checker.
+ is_exported :: Name -> Bool
+ is_exported | ghci_mode == Interactive = isExternalName
+ | otherwise = (`elemNameSet` export_fvs)
+
+ export_fvs = availsToNameSet exports
\end{code}
-- alone leaves tons of crud.
-- Used (a) for user expressions typed in at the interactive prompt
-- (b) the LHS and RHS of a RULE
+--
+-- The name 'Gently' suggests that the SimplifierMode is SimplGently,
+-- and in fact that is so.... but the 'Gently' in simplExprGently doesn't
+-- enforce that; it just simplifies the expression twice
+
simplExprGently env expr
= simplExpr env (occurAnalyseGlobalExpr expr) `thenSmpl` \ expr1 ->
simplExpr env (occurAnalyseGlobalExpr expr1)
max_iterations = intSwitchSet sw_chkr MaxSimplifierIterations `orElse` 2
iteration us iteration_no counts binds
+ -- iteration_no is the number of the iteration we are
+ -- about to begin, with '1' for the first
+ | iteration_no > max_iterations -- Stop if we've run out of iterations
+ = do {
+#ifdef DEBUG
+ if max_iterations > 2 then
+ hPutStr stderr ("NOTE: Simplifier still going after " ++
+ show max_iterations ++
+ " iterations; bailing out.\n")
+ else
+ return ();
+#endif
+ -- Subtract 1 from iteration_no to get the
+ -- number of iterations we actually completed
+ return ("Simplifier baled out", iteration_no - 1, counts, binds)
+ }
+
-- Try and force thunks off the binds; significantly reduces
-- space usage, especially with -O. JRS, 000620.
| let sz = coreBindsSize binds in sz == sz
-- t = initSmpl ...
-- counts' = snd t
-- in
- -- case t of {(_,counts') -> if counts'=0 then ...
+ -- case t of {(_,counts') -> if counts'=0 then ... }
-- So the conditional didn't force counts', because the
-- selection got duplicated. Sigh!
case initSmpl dflags us1 (simplTopBinds simpl_env tagged_binds) of {
-- Dump the result of this iteration
dumpIfSet_dyn dflags Opt_D_dump_simpl_iterations herald
- (pprSimplCount counts') ;
+ (pprSimplCount counts') ;
endPass dflags herald Opt_D_dump_simpl_iterations binds' ;
- -- Stop if we've run out of iterations
- if iteration_no == max_iterations then
- do {
-#ifdef DEBUG
- if max_iterations > 2 then
- hPutStr stderr ("NOTE: Simplifier still going after " ++
- show max_iterations ++
- " iterations; bailing out.\n")
- else
-#endif
- return ();
-
- return ("Simplifier baled out", iteration_no, all_counts, binds')
- }
-
- -- Else loop
- else iteration us2 (iteration_no + 1) all_counts binds'
+ -- Loop
+ iteration us2 (iteration_no + 1) all_counts binds'
} } } }
where
(us1, us2) = splitUniqSupply us
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