Haskell Program Coverage

[ghc-hetmet.git] / compiler / deSugar / DsExpr.lhs

diff --git a/compiler/deSugar/DsExpr.lhs b/compiler/deSugar/DsExpr.lhs
index a85f100..2bb2cc4 100644 (file)
--- a/compiler/deSugar/DsExpr.lhs
+++ b/compiler/deSugar/DsExpr.lhs
@@ -1,66 +1,59 @@
 %
+% (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 )
+import Foreign.StablePtr
+import GHC.Exts
+import IOEnv
+import PrelNames
+import TysWiredIn
+import TypeRep
+import TyCon
 #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
        -- Template Haskell stuff iff bootstrapped
-import DsMeta          ( dsBracket )
+import DsMeta
 #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
 \end{code}
@@ -118,11 +111,12 @@ ds_val_bind (NonRecursive, hsbinds) body
        --       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( isIdHsWrapper co_fn )
-          returnDs (bindNonRec fun rhs body_w_exports)
+           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
@@ -577,6 +571,26 @@ dsExpr (HsSpliceE s)       = pprPanic "dsExpr:splice" (ppr s)
 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}