\begin{code}
module HscMain ( HscResult(..), hscMain,
#ifdef GHCI
- hscExpr,
+ hscStmt,
#endif
initPersistentCompilerState ) where
#include "HsVersions.h"
#ifdef GHCI
-import RdrHsSyn ( RdrNameHsExpr )
-import Rename ( renameExpr )
-import Unique ( Uniquable(..) )
-import Type ( Type, splitTyConApp_maybe, tidyType )
-import PrelNames ( ioTyConKey )
+import RdrHsSyn ( RdrNameStmt )
+import Rename ( renameStmt )
import ByteCodeGen ( byteCodeGen )
#endif
import CodeGen ( codeGen )
import CodeOutput ( codeOutput )
+import Id ( Id, idName, idFlavour, modifyIdInfo )
+import IdInfo ( setFlavourInfo, makeConstantFlavour )
import Module ( ModuleName, moduleName, mkHomeModule )
import CmdLineOpts
import ErrUtils ( dumpIfSet_dyn, showPass )
import HscStats ( ppSourceStats )
import HscTypes ( ModDetails, ModIface(..), PersistentCompilerState(..),
PersistentRenamerState(..), ModuleLocation(..),
- HomeSymbolTable,
+ HomeSymbolTable, InteractiveContext(..), TyThing(..),
NameSupply(..), PackageRuleBase, HomeIfaceTable,
- typeEnvClasses, typeEnvTyCons, emptyIfaceTable )
+ typeEnvClasses, typeEnvTyCons, emptyIfaceTable,
+ extendLocalRdrEnv
+ )
import FiniteMap ( FiniteMap, plusFM, emptyFM, addToFM )
import OccName ( OccName )
-import VarEnv ( emptyTidyEnv )
import Name ( Name, nameModule, nameOccName, getName, isGlobalName,
- emptyNameEnv )
+ emptyNameEnv, extendNameEnvList
+ )
import Module ( Module, lookupModuleEnvByName )
import Monad ( when )
}
| otherwise
= do {
- hPutStrLn stderr "compilation IS NOT required";
+ when (verbosity dflags >= 1) $
+ hPutStrLn stderr ("Skipping " ++
+ (unJust "hscNoRecomp" (ml_hs_file location)));
-- CLOSURE
(pcs_cl, closure_errs, cl_hs_decls)
hscRecomp ghci_mode dflags location maybe_checked_iface hst hit pcs_ch
= do {
; when (verbosity dflags >= 1) $
- hPutStrLn stderr "compilation IS required";
+ hPutStrLn stderr ("Compiling " ++
+ (unJust "hscRecomp" (ml_hs_file location)))
-- what target are we shooting for?
; let toInterp = dopt_HscLang dflags == HscInterpreted
-------------------
-- RENAME
-------------------
- ; (pcs_rn, maybe_rn_result)
+ ; (pcs_rn, print_unqualified, maybe_rn_result)
<- _scc_ "Rename"
renameModule dflags hit hst pcs_ch this_mod rdr_module
; case maybe_rn_result of {
Nothing -> return (HscFail pcs_ch{-was: pcs_rn-});
- Just (print_unqualified, (is_exported, new_iface, rn_hs_decls)) -> do {
+ Just (is_exported, new_iface, rn_hs_decls) -> do {
-- 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
%************************************************************************
%* *
-\subsection{Compiling an expression}
+\subsection{Compiling a do-statement}
%* *
%************************************************************************
\begin{code}
#ifdef GHCI
-hscExpr
+hscStmt
:: DynFlags
- -> Bool -- True <=> wrap in 'print' to get a result of IO type
-> HomeSymbolTable
-> HomeIfaceTable
-> PersistentCompilerState -- IN: persistent compiler state
- -> Module -- Context for compiling
- -> String -- The expression
+ -> InteractiveContext -- Context for compiling
+ -> String -- The statement
-> IO ( PersistentCompilerState,
- Maybe (UnlinkedBCOExpr, PrintUnqualified, Type) )
+ Maybe (InteractiveContext,
+ [Id],
+ UnlinkedBCOExpr) )
+\end{code}
+
+When the UnlinkedBCOExpr is linked you get an HValue of type
+ IO [HValue]
+When you run it you get a list of HValues that should be
+the same length as the list of names; add them to the ClosureEnv.
+
+A naked expression returns a singleton Name [it].
+
+ What you type The IO [HValue] that hscStmt returns
+ ------------- ------------------------------------
+ let pat = expr ==> let pat = expr in return [coerce HVal x, coerce HVal y, ...]
+ bindings: [x,y,...]
+
+ pat <- expr ==> expr >>= \ pat -> return [coerce HVal x, coerce HVal y, ...]
+ bindings: [x,y,...]
+
+ expr (of IO type) ==> expr >>= \ v -> return [v]
+ [NB: result not printed] bindings: [it]
+
+
+ expr (of non-IO type,
+ result showable) ==> let v = expr in print v >> return [v]
+ bindings: [it]
-hscExpr dflags wrap_io hst hit pcs0 this_module expr
- = do {
- maybe_parsed <- hscParseExpr dflags expr;
- case maybe_parsed of
+ expr (of non-IO type,
+ result not showable) ==> error
+
+\begin{code}
+hscStmt dflags hst hit pcs0 icontext stmt
+ = let
+ InteractiveContext {
+ ic_rn_env = rn_env,
+ ic_type_env = type_env,
+ ic_module = this_mod } = icontext
+ in
+ do { maybe_stmt <- hscParseStmt dflags stmt
+ ; case maybe_stmt of
Nothing -> return (pcs0, Nothing)
- Just parsed_expr -> do {
+ Just parsed_stmt -> do {
-- Rename it
- (pcs1, maybe_renamed_expr) <-
- renameExpr dflags hit hst pcs0 this_module parsed_expr;
- case maybe_renamed_expr of
- Nothing -> return ({-WAS:pcs1-} pcs0, Nothing)
- Just (print_unqual, rn_expr) -> do {
+ (pcs1, print_unqual, maybe_renamed_stmt)
+ <- renameStmt dflags hit hst pcs0 this_mod rn_env parsed_stmt
+ ; case maybe_renamed_stmt of
+ Nothing -> return (pcs0, Nothing)
+ Just (bound_names, rn_stmt) -> do {
-- Typecheck it
- maybe_tc_return
- <- typecheckExpr dflags wrap_io pcs1 hst print_unqual this_module rn_expr;
- case maybe_tc_return of {
- Nothing -> return ({-WAS:pcs1-} pcs0, Nothing);
- Just (pcs2, tc_expr, ty) -> do
-
- let tidy_ty = tidyType emptyTidyEnv ty;
+ maybe_tc_return <- typecheckStmt dflags pcs1 hst type_env
+ print_unqual this_mod bound_names rn_stmt
+ ; case maybe_tc_return of {
+ Nothing -> return (pcs0, Nothing) ;
+ Just (pcs2, tc_expr, bound_ids) -> do {
-- Desugar it
- ds_expr <- deSugarExpr dflags pcs2 hst this_module
- print_unqual tc_expr;
+ ds_expr <- deSugarExpr dflags pcs2 hst this_mod print_unqual tc_expr
-- Simplify it
- simpl_expr <- simplifyExpr dflags pcs2 hst ds_expr;
+ ; simpl_expr <- simplifyExpr dflags pcs2 hst ds_expr
-- Saturate it
- sat_expr <- coreSatExpr dflags simpl_expr;
-
- -- ToDo: need to do SRTs?
+ ; sat_expr <- coreSatExpr dflags simpl_expr
-- Convert to BCOs
- bcos <- coreExprToBCOs dflags sat_expr
-
- return (pcs2, Just (bcos, print_unqual, tidy_ty));
- }}}}
-
-hscParseExpr :: DynFlags -> String -> IO (Maybe RdrNameHsExpr)
-hscParseExpr dflags str
+ ; bcos <- coreExprToBCOs dflags sat_expr
+
+ ; let
+ -- make all the bound ids "constant" ids, now that
+ -- they're notionally top-level bindings. This is
+ -- important: otherwise when we come to compile an expression
+ -- using these ids later, the byte code generator will consider
+ -- the occurrences to be free rather than global.
+ constant_bound_ids = map constantizeId bound_ids
+ constantizeId id
+ = modifyIdInfo (`setFlavourInfo` makeConstantFlavour
+ (idFlavour id)) id
+
+ new_rn_env = extendLocalRdrEnv rn_env
+ (map idName constant_bound_ids)
+ -- Extend the renamer-env from bound_ids, not bound_names,
+ -- because the latter may contain [it] when the former is empty
+
+ new_type_env = extendNameEnvList type_env
+ [(getName id, AnId id) | id <- constant_bound_ids]
+
+ new_icontext = icontext { ic_rn_env = new_rn_env,
+ ic_type_env = new_type_env }
+ ; return (pcs2, Just (new_icontext, bound_ids, bcos))
+ }}}}}
+
+hscParseStmt :: DynFlags -> String -> IO (Maybe RdrNameStmt)
+hscParseStmt dflags str
= do -------------------------- Parser ----------------
showPass dflags "Parser"
_scc_ "Parser" do
buf <- stringToStringBuffer str
let glaexts | dopt Opt_GlasgowExts dflags = 1#
- | otherwise = 0#
+ | otherwise = 0#
- case parseExpr buf PState{ bol = 0#, atbol = 1#,
+ case parseStmt buf PState{ bol = 0#, atbol = 1#,
context = [], glasgow_exts = glaexts,
loc = mkSrcLoc SLIT("<no file>") 0 } of {
PFailed err -> do { hPutStrLn stderr (showSDoc err);
--- Not yet implemented in <4.11 freeStringBuffer buf;
+-- Not yet implemented in <4.11 freeStringBuffer buf;
return Nothing };
- POk _ rdr_expr -> do {
+ -- no stmt: the line consisted of just space or comments
+ POk _ Nothing -> return Nothing;
+
+ POk _ (Just rdr_stmt) -> do {
--ToDo: can't free the string buffer until we've finished this
-- compilation sweep and all the identifiers have gone away.
--freeStringBuffer buf;
- dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_expr);
- return (Just rdr_expr)
+ dumpIfSet_dyn dflags Opt_D_dump_parsed "Parser" (ppr rdr_stmt);
+ return (Just rdr_stmt)
}}
#endif
\end{code}
projects / ghc-hetmet.git / blobdiff