%
+% (c) The University of Glasgow 2006
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
-\section[DsExpr]{Matching expressions (Exprs)}
+
+Desugaring exporessions.
\begin{code}
module DsExpr ( dsExpr, dsLExpr, dsLocalBinds, dsValBinds, dsLit ) where
#include "HsVersions.h"
-#if defined(GHCI) && defined(BREAKPOINT)
-import Foreign.StablePtr ( newStablePtr, castStablePtrToPtr )
-import GHC.Exts ( Ptr(..), Int(..), addr2Int# )
-import IOEnv ( ioToIOEnv )
-import PrelNames ( breakpointJumpName, breakpointCondJumpName )
-import TysWiredIn ( unitTy )
-import TypeRep ( Type(..) )
-import TyCon ( isUnLiftedTyCon )
-#endif
-import Match ( matchWrapper, matchSinglePat, matchEquations )
-import MatchLit ( dsLit, dsOverLit )
-import DsBinds ( dsLHsBinds, dsCoercion )
-import DsGRHSs ( dsGuarded )
-import DsListComp ( dsListComp, dsPArrComp )
-import DsUtils ( mkErrorAppDs, mkStringExpr, mkConsExpr, mkNilExpr,
- extractMatchResult, cantFailMatchResult, matchCanFail,
- mkCoreTupTy, selectSimpleMatchVarL, lookupEvidence, selectMatchVar )
-import DsArrows ( dsProcExpr )
+
+import Match
+import MatchLit
+import DsBinds
+import DsGRHSs
+import DsListComp
+import DsUtils
+import DsArrows
import DsMonad
#ifdef GHCI
+import PrelNames
+import DsBreakpoint
-- Template Haskell stuff iff bootstrapped
-import DsMeta ( dsBracket )
+import DsMeta
+#else
+import DsBreakpoint
#endif
import HsSyn
-import TcHsSyn ( hsLPatType, mkVanillaTuplePat )
+import TcHsSyn
-- NB: The desugarer, which straddles the source and Core worlds, sometimes
--- needs to see source types (newtypes etc), and sometimes not
--- So WATCH OUT; check each use of split*Ty functions.
--- Sigh. This is a pain.
-
-import TcType ( tcSplitAppTy, tcSplitFunTys, tcTyConAppTyCon,
- tcTyConAppArgs, isUnLiftedType, Type, mkAppTy )
-import Type ( splitFunTys, isUnboxedTupleType, mkFunTy )
+-- needs to see source types
+import TcType
+import Type
import CoreSyn
-import CoreUtils ( exprType, mkIfThenElse, bindNonRec )
-
-import CostCentre ( mkUserCC )
-import Id ( Id, idType, idName, idDataCon )
-import PrelInfo ( rEC_CON_ERROR_ID )
-import DataCon ( DataCon, dataConWrapId, dataConFieldLabels, dataConInstOrigArgTys )
-import DataCon ( isVanillaDataCon )
-import TyCon ( FieldLabel, tyConDataCons )
-import TysWiredIn ( tupleCon )
-import BasicTypes ( RecFlag(..), Boxity(..), ipNameName )
-import PrelNames ( toPName,
- returnMName, bindMName, thenMName, failMName,
- mfixName )
-import SrcLoc ( Located(..), unLoc, getLoc, noLoc )
-import Util ( zipEqual, zipWithEqual )
-import Bag ( bagToList )
+import CoreUtils
+
+import CostCentre
+import Id
+import PrelInfo
+import DataCon
+import TyCon
+import TysWiredIn
+import BasicTypes
+import PrelNames
+import SrcLoc
+import Util
+import Bag
import Outputable
import FastString
+
+import Data.Maybe
\end{code}
-- below. Then pattern-match would fail. Urk.)
putSrcSpanDs loc $
case bind of
- FunBind { fun_id = L _ fun, fun_matches = matches, fun_co_fn = co_fn }
+ FunBind { fun_id = L _ fun, fun_matches = matches, fun_co_fn = co_fn, fun_tick = tick }
-> matchWrapper (FunRhs (idName fun)) matches `thenDs` \ (args, rhs) ->
ASSERT( null args ) -- Functions aren't lifted
- ASSERT( isIdCoercion co_fn )
- returnDs (bindNonRec fun rhs body_w_exports)
+ ASSERT( isIdHsWrapper co_fn )
+ mkOptTickBox tick rhs `thenDs` \ rhs' ->
+ returnDs (bindNonRec fun rhs' body_w_exports)
PatBind {pat_lhs = pat, pat_rhs = grhss, pat_rhs_ty = ty }
-> -- let C x# y# = rhs in body
| x == var = Case scrut bndr ty alts
scrungle (Let binds body) = Let binds (scrungle body)
scrungle other = panic ("scrungleMatch: tuple pattern:\n" ++ showSDoc (ppr other))
+
\end{code}
%************************************************************************
\begin{code}
dsLExpr :: LHsExpr Id -> DsM CoreExpr
+
+#if defined(GHCI)
+dsLExpr (L loc expr@(HsWrap w (HsVar v)))
+ | idName v `elem` [breakpointName, breakpointCondName, breakpointAutoName]
+ , WpTyApp ty <- simpWrapper w
+ = do areBreakpointsEnabled <- breakpoints_enabled
+ if areBreakpointsEnabled
+ then do
+ L _ breakpointExpr <- mkBreakpointExpr loc v ty
+ dsLExpr (L loc $ HsWrap w breakpointExpr)
+ else putSrcSpanDs loc $ dsExpr expr
+ where simpWrapper (WpCompose w1 WpHole) = w1
+ simpWrapper (WpCompose WpHole w1) = w1
+ simpWrapper w = w
+#endif
+
dsLExpr (L loc e) = putSrcSpanDs loc $ dsExpr e
dsExpr :: HsExpr Id -> DsM CoreExpr
-
dsExpr (HsPar e) = dsLExpr e
dsExpr (ExprWithTySigOut e _) = dsLExpr e
dsExpr (HsVar var) = returnDs (Var var)
dsExpr (HsIPVar ip) = returnDs (Var (ipNameName ip))
dsExpr (HsLit lit) = dsLit lit
dsExpr (HsOverLit lit) = dsOverLit lit
-dsExpr (HsCoerce co_fn e) = dsCoercion co_fn (dsExpr e)
+dsExpr (HsWrap co_fn e) = dsCoercion co_fn (dsExpr e)
dsExpr (NegApp expr neg_expr)
= do { core_expr <- dsLExpr expr
= matchWrapper LambdaExpr a_Match `thenDs` \ (binders, matching_code) ->
returnDs (mkLams binders matching_code)
-#if defined(GHCI) && defined(BREAKPOINT)
-dsExpr (HsApp (L _ (HsApp realFun@(L _ (HsCoerce _ fun)) (L loc arg))) _)
- | HsVar funId <- fun
- , idName funId `elem` [breakpointJumpName, breakpointCondJumpName]
- , ids <- filter (isValidType . idType) (extractIds arg)
- = do warnDs (text "Extracted ids:" <+> ppr ids <+> ppr (map idType ids))
- stablePtr <- ioToIOEnv $ newStablePtr ids
- -- Yes, I know... I'm gonna burn in hell.
- let Ptr addr# = castStablePtrToPtr stablePtr
- funCore <- dsLExpr realFun
- argCore <- dsLExpr (L loc (HsLit (HsInt (fromIntegral (I# (addr2Int# addr#))))))
- hvalCore <- dsLExpr (L loc (extractHVals ids))
- return ((funCore `App` argCore) `App` hvalCore)
- where extractIds :: HsExpr Id -> [Id]
- extractIds (HsApp fn arg)
- | HsVar argId <- unLoc arg
- = argId:extractIds (unLoc fn)
- | HsCoerce co_fn arg' <- unLoc arg
- , HsVar argId <- arg' -- SLPJ: not sure what is going on here
- = error (showSDoc (ppr co_fn)) -- argId:extractIds (unLoc fn)
- extractIds x = []
- extractHVals ids = ExplicitList unitTy (map (L loc . HsVar) ids)
- -- checks for tyvars and unlifted kinds.
- isValidType (TyVarTy _) = False
- isValidType (FunTy a b) = isValidType a && isValidType b
- isValidType (NoteTy _ t) = isValidType t
- isValidType (AppTy a b) = isValidType a && isValidType b
- isValidType (TyConApp con ts) = not (isUnLiftedTyCon con) && all isValidType ts
- isValidType _ = True
-#endif
-
dsExpr expr@(HsApp fun arg)
= dsLExpr fun `thenDs` \ core_fun ->
dsLExpr arg `thenDs` \ core_arg ->
matchWrapper CaseAlt matches `thenDs` \ ([discrim_var], matching_code) ->
returnDs (scrungleMatch discrim_var core_discrim matching_code)
+-- Pepe: The binds are in scope in the body but NOT in the binding group
+-- This is to avoid silliness in breakpoints
dsExpr (HsLet binds body)
- = dsLExpr body `thenDs` \ body' ->
+ = (bindLocalsDs (map unLoc $ collectLocalBinders binds) $
+ dsAndThenMaybeInsertBreakpoint body) `thenDs` \ body' ->
dsLocalBinds binds body'
-- We need the `ListComp' form to use `deListComp' (rather than the "do" form)
constructor @C@, setting all of @C@'s fields to bottom.
\begin{code}
-dsExpr (RecordCon (L _ data_con_id) con_expr rbinds)
+dsExpr (RecordCon (L _ data_con_id) con_expr (HsRecordBinds rbinds))
= dsExpr con_expr `thenDs` \ con_expr' ->
let
(arg_tys, _) = tcSplitFunTys (exprType con_expr')
dictionaries.
\begin{code}
-dsExpr (RecordUpd record_expr [] record_in_ty record_out_ty)
+dsExpr (RecordUpd record_expr (HsRecordBinds []) record_in_ty record_out_ty)
= dsLExpr record_expr
-dsExpr expr@(RecordUpd record_expr rbinds record_in_ty record_out_ty)
+dsExpr expr@(RecordUpd record_expr (HsRecordBinds rbinds) record_in_ty record_out_ty)
= dsLExpr record_expr `thenDs` \ record_expr' ->
-- Desugar the rbinds, and generate let-bindings if
dsExpr (HsProc pat cmd) = dsProcExpr pat cmd
\end{code}
+Hpc Support
+
+\begin{code}
+dsExpr (HsTick ix e) = do
+ e' <- dsLExpr e
+ mkTickBox ix e'
+
+-- There is a problem here. The then and else branches
+-- have no free variables, so they are open to lifting.
+-- We need someway of stopping this.
+-- This will make no difference to binary coverage
+-- (did you go here: YES or NO), but will effect accurate
+-- tick counting.
+
+dsExpr (HsBinTick ixT ixF e) = do
+ e2 <- dsLExpr e
+ do { ASSERT(exprType e2 `coreEqType` boolTy)
+ mkBinaryTickBox ixT ixF e2
+ }
+\end{code}
\begin{code}
dsDo stmts body result_ty
= go (map unLoc stmts)
where
- go [] = dsLExpr body
+ go [] = dsAndThenMaybeInsertBreakpoint body
go (ExprStmt rhs then_expr _ : stmts)
- = do { rhs2 <- dsLExpr rhs
+ = do { rhs2 <- dsAndThenMaybeInsertBreakpoint rhs
; then_expr2 <- dsExpr then_expr
; rest <- go stmts
; returnDs (mkApps then_expr2 [rhs2, rest]) }
go (LetStmt binds : stmts)
- = do { rest <- go stmts
+ = do { rest <- bindLocalsDs (map unLoc$ collectLocalBinders binds) $
+ go stmts
; dsLocalBinds binds rest }
-
+
+ -- Notice how due to the placement of bindLocals, binders in this stmt
+ -- are available in posterior stmts but Not in this one rhs.
+ -- This is to avoid silliness in breakpoints
go (BindStmt pat rhs bind_op fail_op : stmts)
- = do { body <- go stmts
+ =
+ do { body <- bindLocalsDs (collectPatBinders pat) $ go stmts
; var <- selectSimpleMatchVarL pat
; match <- matchSinglePat (Var var) (StmtCtxt DoExpr) pat
result_ty (cantFailMatchResult body)
; match_code <- handle_failure pat match fail_op
- ; rhs' <- dsLExpr rhs
+ ; rhs' <- dsAndThenMaybeInsertBreakpoint rhs
; bind_op' <- dsExpr bind_op
; returnDs (mkApps bind_op' [rhs', Lam var match_code]) }
; dsLocalBinds binds rest }
go (ExprStmt rhs _ rhs_ty : stmts)
- = do { rhs2 <- dsLExpr rhs
+ = do { rhs2 <- dsAndThenMaybeInsertBreakpoint rhs
; rest <- go stmts
; returnDs (mkApps (Var then_id) [Type rhs_ty, Type b_ty, rhs2, rest]) }
go (BindStmt pat rhs _ _ : stmts)
- = do { body <- go stmts
+ = do { body <- bindLocalsDs (collectPatBinders pat) $ go stmts
; var <- selectSimpleMatchVarL pat
; match <- matchSinglePat (Var var) (StmtCtxt ctxt) pat
result_ty (cantFailMatchResult body)
; let fail_expr = mkApps (Var fail_id) [Type b_ty, fail_msg]
; match_code <- extractMatchResult match fail_expr
- ; rhs' <- dsLExpr rhs
+ ; rhs' <- dsAndThenMaybeInsertBreakpoint rhs
; returnDs (mkApps (Var bind_id) [Type (hsLPatType pat), Type b_ty,
rhs', Lam var match_code]) }
projects / ghc-hetmet.git / blobdiff