\section[Desugar]{@deSugar@: the main function}
\begin{code}
-module Desugar ( deSugar, deSugarExpr ) where
+module Desugar ( deSugar, deSugarExpr,
+ deSugarCore ) where
#include "HsVersions.h"
import CmdLineOpts ( DynFlags, DynFlag(..), dopt, opt_SccProfilingOn )
-import HscTypes ( ModDetails(..) )
+import HscTypes ( ModDetails(..), TypeEnv )
import HsSyn ( MonoBinds, RuleDecl(..), RuleBndr(..),
HsExpr(..), HsBinds(..), MonoBinds(..) )
-import TcHsSyn ( TypecheckedRuleDecl, TypecheckedHsExpr )
+import TcHsSyn ( TypecheckedRuleDecl, TypecheckedHsExpr,
+ TypecheckedCoreBind )
import TcModule ( TcResults(..) )
import Id ( Id )
import CoreSyn
-import PprCore ( pprIdCoreRule, pprCoreExpr )
+import PprCore ( pprIdRules, pprCoreExpr )
import Subst ( substExpr, mkSubst, mkInScopeSet )
import DsMonad
import DsExpr ( dsExpr )
-> PersistentCompilerState -> HomeSymbolTable
-> Module -> PrintUnqualified
-> TcResults
- -> IO (ModDetails, (SDoc, SDoc, [CoreBndr]))
+ -> IO (ModDetails, (SDoc, SDoc, [FAST_STRING], [CoreBndr]))
deSugar dflags pcs hst mod_name unqual
- (TcResults {tc_env = type_env,
- tc_binds = all_binds,
- tc_insts = insts,
- tc_rules = rules,
- tc_fords = fo_decls})
+ (TcResults {tc_env = type_env,
+ tc_binds = all_binds,
+ tc_insts = insts,
+ tc_rules = rules,
+-- tc_cbinds = core_binds,
+ tc_fords = fo_decls})
= do { showPass dflags "Desugar"
; us <- mkSplitUniqSupply 'd'
(dsProgram mod_name all_binds rules fo_decls)
(ds_binds, ds_rules, foreign_stuff) = ds_result
-
+
+{-
+ addCoreBinds ls =
+ case core_binds of
+ [] -> ls
+ cs -> (Rec cs) : ls
+-}
mod_details = ModDetails { md_types = type_env,
md_insts = insts,
md_rules = ds_rules,
dsProgram mod_name all_binds rules fo_decls
= dsMonoBinds auto_scc all_binds [] `thenDs` \ core_prs ->
- dsForeigns mod_name fo_decls `thenDs` \ (fe_binders, foreign_binds, h_code, c_code) ->
+ dsForeigns mod_name fo_decls `thenDs` \ (fe_binders, foreign_binds, h_code, c_code, headers) ->
let
ds_binds = [Rec (foreign_binds ++ core_prs)]
-- Notice that we put the whole lot in a big Rec, even the foreign binds
local_binders = mkVarSet (bindersOfBinds ds_binds)
in
mapDs (dsRule local_binders) rules `thenDs` \ rules' ->
- returnDs (ds_binds, rules', (h_code, c_code, fe_binders))
+ returnDs (ds_binds, rules', (h_code, c_code, headers, fe_binders))
where
auto_scc | opt_SccProfilingOn = TopLevel
| otherwise = NoSccs
ppr_ds_rules [] = empty
ppr_ds_rules rules
= text "" $$ text "-------------- DESUGARED RULES -----------------" $$
- vcat (map pprIdCoreRule rules)
+ pprIdRules rules
+\end{code}
+
+Simplest thing in the world, desugaring External Core:
+
+\begin{code}
+deSugarCore :: TypeEnv -> [TypecheckedCoreBind]
+ -> IO (ModDetails, (SDoc, SDoc, [FAST_STRING], [CoreBndr]))
+deSugarCore type_env cs = do
+ let
+ mod_details
+ = ModDetails { md_types = type_env
+ , md_insts = []
+ , md_rules = []
+ , md_binds = [Rec (map (\ (lhs,_,rhs) -> (lhs,rhs)) cs)]
+ }
+
+ no_foreign_stuff = (empty,empty,[],[])
+ return (mod_details, no_foreign_stuff)
+
\end{code}
\begin{code}
dsRule :: IdSet -> TypecheckedRuleDecl -> DsM (Id, CoreRule)
-dsRule in_scope (HsRule name sig_tvs vars lhs rhs loc)
+dsRule in_scope (IfaceRuleOut fun rule) -- Built-in rules come this way
+ = returnDs (fun, rule)
+
+dsRule in_scope (HsRule name act vars lhs rhs loc)
= putSrcLocDs loc $
ds_lhs all_vars lhs `thenDs` \ (fn, args) ->
dsExpr rhs `thenDs` \ core_rhs ->
- returnDs (fn, Rule name tpl_vars args core_rhs)
+ returnDs (fn, Rule name act tpl_vars args core_rhs)
where
- tpl_vars = sig_tvs ++ [var | RuleBndr var <- vars]
+ tpl_vars = [var | RuleBndr var <- vars]
all_vars = mkInScopeSet (in_scope `unionVarSet` mkVarSet tpl_vars)
ds_lhs all_vars lhs