%
-% (c) The GRASP/AQUA Project, Glasgow University, 1993-1998
+% (c) The GRASP/AQUA Project, Glasgow University, 1993-2000
%
\section{Generate Java}
+Name mangling for Java.
+~~~~~~~~~~~~~~~~~~~~~~
+
+Haskell has a number of namespaces. The Java translator uses
+the standard Haskell mangles (see OccName.lhs), and some extra
+mangles.
+
+All names are hidden inside packages.
+
+module name:
+ - becomes a first level java package.
+ - can not clash with java, because haskell modules are upper case,
+ java default packages are lower case.
+
+function names:
+ - these turn into classes
+ - java keywords (eg. private) have the suffix "zdk" ($k) added.
+
+data *types*
+ - These have a base class, so need to appear in the
+ same name space as other object. for example data Foo = Foo
+ - We add a postfix to types: "zdc" ($c)
+ - Types are upper case, so never clash with keywords
+
+data constructors
+ - There are tWO classes for each Constructor
+ (1) - Class with the payload extends the relevent datatype baseclass.
+ - This class has the prefix zdw ($w)
+ (2) - Constructor *wrapper* just use their own name.
+ - Constructors are upper case, so never clash with keywords
+ - So Foo would become 2 classes.
+ * Foo -- the constructor wrapper
+ * zdwFoo -- the worker, with the payload
+
+
+$i for instances.
+$k for keyword nameclash avoidance.
+
\begin{code}
module JavaGen( javaGen ) where
import Java
import Literal ( Literal(..) )
-import Id ( Id, isDataConId_maybe, isId, idName, isDeadBinder )
-import Name ( NamedThing(..), getOccString, isGlobalName )
-import DataCon ( DataCon, dataConRepArity, dataConId )
-import qualified CoreSyn
+import Id ( Id, isDataConWorkId_maybe, isId, idName, isDeadBinder, idPrimRep
+ , isPrimOpId_maybe )
+import Name ( NamedThing(..), getOccString, isExternalName, isInternalName
+ , nameModule )
+import PrimRep ( PrimRep(..) )
+import DataCon ( DataCon, dataConRepArity, dataConRepArgTys, dataConWorkId )
+import qualified Type
+import qualified CoreSyn
import CoreSyn ( CoreBind, CoreExpr, CoreAlt, CoreBndr,
- Bind(..), Alt, AltCon(..), collectBinders, isValArg
+ Bind(..), AltCon(..), collectBinders, isValArg
)
-import CoreUtils( exprIsValue, exprIsTrivial )
+import TysWiredIn ( boolTy, trueDataCon, falseDataCon )
+import qualified CoreUtils
import Module ( Module, moduleString )
import TyCon ( TyCon, isDataTyCon, tyConDataCons )
import Outputable
+import Maybe
+import PrimOp
+import Util ( lengthIs, notNull )
+
#include "HsVersions.h"
\end{code}
javaGen mod import_mods tycons binds
= liftCompilationUnit package
where
- decls = [Import [moduleString mod] | mod <- import_mods] ++
+ decls = [Import "haskell.runtime.*"] ++
+ [Import (moduleString mod) | mod <- import_mods] ++
concat (map javaTyCon (filter isDataTyCon tycons)) ++
concat (map javaTopBind binds)
package = Package (moduleString mod) decls
-- public class $wNil extends List {}
javaTyCon tycon
- = tycon_jclass : map constr_class constrs
+ = tycon_jclass : concat (map constr_class constrs)
where
constrs = tyConDataCons tycon
- tycon_jclass_jname = javaName tycon
- tycon_jclass = Class [Public] tycon_jclass_jname [] [] []
+ tycon_jclass_jname = javaTyConTypeName tycon ++ "zdc"
+ tycon_jclass = Class [Public] (shortName tycon_jclass_jname) [] [] []
constr_class data_con
- = Class [Public] constr_jname [tycon_jclass_jname] [] field_decls
+ = [ Class [Public] constr_jname [tycon_jclass_jname] []
+ (field_decls ++ [cons_meth,debug_meth])
+ ]
where
- constr_jname = javaConstrWkrName data_con
- constr_jtype = javaConstrWkrType data_con
- enter_meth = Method [Public] objectType enterName [] stmts
- n_val_args = dataConRepArity data_con
- field_names = map fieldName [1..n_val_args]
- field_decls = [Field [Public] objectType f Nothing | f <- field_names]
- stmts = vmCOLLECT n_val_args (Var thisName) ++
- [var [Final] objectType f vmPOP | f <- field_names] ++
- [Return (New constr_jtype (map Var field_names) Nothing)]
+ constr_jname = shortName (javaConstrWkrName data_con)
+
+ field_names = constrToFields data_con
+ field_decls = [ Field [Public] n Nothing
+ | n <- field_names
+ ]
+
+ cons_meth = mkCons constr_jname field_names
+
+ debug_meth = Method [Public] (Name "toString" stringType)
+ []
+ []
+ ( [ Declaration (Field [] txt Nothing) ]
+ ++ [ ExprStatement
+ (Assign (Var txt)
+ (mkStr
+ ("( " ++
+ getOccString data_con ++
+ " ")
+ )
+ )
+ ]
+ ++ [ ExprStatement
+ (Assign (Var txt)
+ (Op (Var txt)
+ "+"
+ (Op (Var n) "+" litSp)
+ )
+ )
+ | n <- field_names
+ ]
+ ++ [ Return (Op (Var txt)
+ "+"
+ (mkStr ")")
+ )
+ ]
+ )
+
+ litSp = mkStr " "
+ txt = Name "__txt" stringType
+
+
+-- This checks to see the type is reasonable to call new with.
+-- primitives might use a static method later.
+mkNew :: Type -> [Expr] -> Expr
+mkNew t@(PrimType primType) _ = error "new primitive -- fix it???"
+mkNew t@(Type _) es = New t es Nothing
+mkNew _ _ = error "new with strange arguments"
+
+constrToFields :: DataCon -> [Name]
+constrToFields cons =
+ [ fieldName i t
+ | (i,t) <- zip [1..] (map primRepToType
+ (map Type.typePrimRep
+ (dataConRepArgTys cons)
+ )
+ )
+ ]
+
+mkCons :: TypeName -> [Name] -> Decl
+mkCons name args = Constructor [Public] name
+ [ Parameter [] n | n <- args ]
+ [ ExprStatement (Assign
+ (Access this n)
+ (Var n)
+ )
+ | n <- args ]
+
+mkStr :: String -> Expr
+mkStr str = Literal (StringLit str)
\end{code}
%************************************************************************
-- public Object ENTER() { ...translation of rhs... }
-- }
java_top_bind bndr rhs
- = Class [Public] (javaName bndr) [] [codeName] [enter_meth]
+ = Class [Public] (shortName (javaIdTypeName bndr))
+ [] [codeName] [enter_meth]
where
- enter_meth = Method [Public] objectType enterName [] (javaExpr rhs)
+ enter_meth = Method [Public]
+ enterName
+ [vmArg]
+ [excName]
+ (javaExpr vmRETURN rhs)
\end{code}
-
%************************************************************************
%* *
\subsection{Expressions}
\begin{code}
javaVar :: Id -> Expr
-javaVar v | isGlobalName (idName v) = New (javaType v) [] Nothing
- | otherwise = Var (javaName v)
+javaVar v | isExternalName (idName v) = mkNew (javaIdType v) []
+ | otherwise = Var (javaName v)
+
+javaLit :: Literal.Literal -> Expr
+javaLit (MachInt i) = Literal (IntLit (fromInteger i))
+javaLit (MachChar c) = Literal (CharLit c)
+javaLit (MachStr fs) = Literal (StringLit str)
+ where
+ str = concatMap renderString (unpackFS fs) ++ "\\000"
+ -- This should really handle all the chars 0..31.
+ renderString '\NUL' = "\\000"
+ renderString other = [other]
-javaLit :: Literal.Literal -> Lit
-javaLit (MachInt i) = UIntLit (fromInteger i)
-javaLit (MachChar c) = UCharLit c
javaLit other = pprPanic "javaLit" (ppr other)
-javaExpr :: CoreExpr -> [Statement]
+-- Pass in the 'shape' of the result.
+javaExpr :: (Expr -> Statement) -> CoreExpr -> [Statement]
-- Generate code to apply the value of
-- the expression to the arguments aleady on the stack
-javaExpr (CoreSyn.Var v) = [Return (javaVar v)]
-javaExpr (CoreSyn.Lit l) = [Return (Literal (javaLit l))]
-javaExpr (CoreSyn.App f a) = javaApp f [a]
-javaExpr e@(CoreSyn.Lam _ _) = javaLam (collectBinders e)
-javaExpr (CoreSyn.Case e x alts) = javaCase e x alts
-javaExpr (CoreSyn.Let bind body) = javaBind bind ++ javaExpr body
-javaExpr (CoreSyn.Note _ e) = javaExpr e
-
-javaCase :: CoreExpr -> Id -> [CoreAlt] -> [Statement]
+javaExpr r (CoreSyn.Var v) = [r (javaVar v)]
+javaExpr r (CoreSyn.Lit l) = [r (javaLit l)]
+javaExpr r (CoreSyn.App f a) = javaApp r f [a]
+javaExpr r e@(CoreSyn.Lam _ _) = javaLam r (collectBinders e)
+javaExpr r (CoreSyn.Case e x alts) = javaCase r e x alts
+javaExpr r (CoreSyn.Let bind body) = javaBind bind ++ javaExpr r body
+javaExpr r (CoreSyn.Note _ e) = javaExpr r e
+
+javaCase :: (Expr -> Statement) -> CoreExpr -> Id -> [CoreAlt] -> [Statement]
-- case e of x { Nil -> r1
-- Cons p q -> r2 }
-- ==>
-- final Object p = ((Cons) x).f1
-- final Object q = ((Cons) x).f2
-- ...translation of r2...
--- } else return null
-
-javaCase e x alts
- = [var [Final] objectType (javaName x) (vmWHNF (javaArg e)),
- IfThenElse (map mk_alt alts) Nothing]
+-- } else throw java.lang.Exception
+
+-- This first special case happens a lot, typically
+-- during dictionary deconstruction.
+-- We need to access at least *one* field, to check to see
+-- if we have correct constructor.
+-- If we've got the wrong one, this is _|_, and the
+-- casting will catch this with an exception.
+
+javaCase r e x [(DataAlt d,bs,rhs)] | notNull bs
+ = java_expr PushExpr e ++
+ [ var [Final] (javaName x)
+ (whnf primRep (vmPOP (primRepToType primRep))) ] ++
+ bind_args d bs ++
+ javaExpr r rhs
+ where
+ primRep = idPrimRep x
+ whnf PtrRep = vmWHNF -- needs evaluation
+ whnf _ = id -- anything else does notg
+
+ bind_args d bs = [var [Final] (javaName b)
+ (Access (Cast (javaConstrWkrType d) (javaVar x)
+ ) f
+ )
+ | (b,f) <- filter isId bs `zip` (constrToFields d)
+ , not (isDeadBinder b)
+ ]
+
+javaCase r e x alts
+ | isIfThenElse && isPrimCmp
+ = javaIfThenElse r (fromJust maybePrim) tExpr fExpr
+ | otherwise
+ = java_expr PushExpr e ++
+ [ var [Final] (javaName x)
+ (whnf primRep (vmPOP (primRepToType primRep)))
+ , IfThenElse (map mk_alt con_alts) (Just default_code)
+ ]
where
- mk_alt (DEFAULT, [], rhs) = (true, Block (javaExpr rhs))
- mk_alt (DataAlt d, bs, rhs) = (instanceOf x d, Block (bind_args d bs ++ javaExpr rhs))
- mk_alt alt@(LitAlt _, _, _) = pprPanic "mk_alt" (ppr alt)
-
- bind_args d bs = [var [Final] objectType (javaName b)
- (Access (Cast (javaConstrWkrType d) (javaVar x)) f)
- | (b, f) <- filter isId bs `zip` map fieldName [1..],
- not (isDeadBinder b)
+ isIfThenElse = CoreUtils.exprType e `Type.eqType` boolTy
+ -- also need to check that x is not free in
+ -- any of the branches.
+ maybePrim = findCmpPrim e []
+ isPrimCmp = isJust maybePrim
+ (_,_,tExpr) = CoreUtils.findAlt (DataAlt trueDataCon) alts
+ (_,_,fExpr) = CoreUtils.findAlt (DataAlt falseDataCon) alts
+
+ primRep = idPrimRep x
+ whnf PtrRep = vmWHNF -- needs evaluation
+ whnf _ = id
+
+ (con_alts, maybe_default) = CoreUtils.findDefault alts
+ default_code = case maybe_default of
+ Nothing -> ExprStatement (Raise excName [Literal (StringLit "case failure")])
+ Just rhs -> Block (javaExpr r rhs)
+
+ mk_alt (DataAlt d, bs, rhs) = (instanceOf x d, Block (bind_args d bs ++ javaExpr r rhs))
+ mk_alt (LitAlt lit, bs, rhs) = (eqLit lit , Block (javaExpr r rhs))
+
+
+ eqLit (MachInt n) = Op (Literal (IntLit n))
+
+ "=="
+ (Var (javaName x))
+ eqLit (MachChar n) = Op (Literal (CharLit n))
+ "=="
+ (Var (javaName x))
+ eqLit other = pprPanic "eqLit" (ppr other)
+
+ bind_args d bs = [var [Final] (javaName b)
+ (Access (Cast (javaConstrWkrType d) (javaVar x)
+ ) f
+ )
+ | (b,f) <- filter isId bs `zip` (constrToFields d)
+ , not (isDeadBinder b)
]
+javaIfThenElse r cmp tExpr fExpr
+{-
+ - Now what we need to do is generate code for the if/then/else.
+ - [all arguments are already check for simpleness (Var or Lit).]
+ -
+ - if (<prim> arg1 arg2 arg3 ...) {
+ - trueCode
+ - } else {
+ - falseCode
+ - }
+ -}
+ = [IfThenElse [(cmp,j_tExpr)] (Just j_fExpr)]
+ where
+ j_tExpr, j_fExpr :: Statement
+ j_tExpr = Block (javaExpr r tExpr)
+ j_fExpr = Block (javaExpr r fExpr)
+
javaBind (NonRec x rhs)
{-
x = ...rhs_x...
==>
final Object x = new Thunk( new Code() { ...code for rhs_x... } )
-}
- = [var [Final] objectType (javaName x) (javaArg rhs)]
+
+ = java_expr (SetVar name) rhs
+ where
+ name = case coreTypeToType rhs of
+ ty@(PrimType _) -> javaName x `withType` ty
+ _ -> javaName x `withType` codeType
javaBind (Rec prs)
{- rec { x = ...rhs_x...; y = ...rhs_y... }
= (map mk_class prs) ++ (map mk_inst prs) ++
(map mk_thunk prs) ++ concat (map mk_knot prs)
where
- mk_class (b,r) = Declaration (Class [] (javaName b) [] [codeName] stmts)
+ mk_class (b,r) = Declaration (Class [] class_name [] [codeName] stmts)
where
- stmts = [Field [] codeType (javaName b) Nothing | (b,_) <- prs] ++
- [Method [Public] objectType enterName [] (javaExpr r)]
+ class_name = javaIdTypeName b
+ stmts = [Field [] (javaName b `withType` codeType) Nothing | (b,_) <- prs] ++
+ [Method [Public] enterName [vmArg] [excName] (javaExpr vmRETURN r)]
- mk_inst (b,r) = var [Final] (javaType b) (javaInstName b)
- (New (javaType b) [] Nothing)
+ mk_inst (b,r) = var [Final] name (mkNew ty [])
+ where
+ name@(Name _ ty) = javaInstName b
- mk_thunk (b,r) = var [Final] thunkType (javaName b)
- (New thunkType [Var (javaInstName b)] Nothing)
+ mk_thunk (b,r) = var [Final] (javaName b `withType` codeType)
+ (mkNew thunkType [Var (javaInstName b)])
- mk_knot (b,_) = [ExprStatement (Assign lhs rhs)
+ mk_knot (b,_) = [ ExprStatement (Assign lhs rhs)
| (b',_) <- prs,
let lhs = Access (Var (javaInstName b)) (javaName b'),
let rhs = Var (javaName b')
]
-
-javaLam :: ([CoreBndr], CoreExpr) -> [Statement]
-javaLam (bndrs, body)
- | null val_bndrs = javaExpr body
+
+javaLam :: (Expr -> Statement) -> ([CoreBndr], CoreExpr) -> [Statement]
+javaLam r (bndrs, body)
+ | null val_bndrs = javaExpr r body
| otherwise
- = vmCOLLECT (length val_bndrs) (Var thisName)
- ++ [var [Final] objectType (javaName n) vmPOP | n <- val_bndrs]
- ++ javaExpr body
+ = vmCOLLECT (length val_bndrs) this
+ ++ [var [Final] n (vmPOP t) | n@(Name _ t) <- val_bndrs]
+ ++ javaExpr r body
where
- val_bndrs = filter isId bndrs
-
-javaApp :: CoreExpr -> [CoreExpr] -> [Statement]
-javaApp (CoreSyn.App f a) as = javaApp f (a:as)
-javaApp (CoreSyn.Var f) as
- = case isDataConId_maybe f of {
- Just dc | length as == dataConRepArity dc
- -> -- Saturated constructors
- [Return (New (javaType f) (javaArgs as) Nothing)]
-
- ; other -> -- Not a saturated constructor
- java_apply (CoreSyn.Var f) as
+ val_bndrs = map javaName (filter isId bndrs)
+
+javaApp :: (Expr -> Statement) -> CoreExpr -> [CoreExpr] -> [Statement]
+javaApp r (CoreSyn.App f a) as
+ | isValArg a = javaApp r f (a:as)
+ | otherwise = javaApp r f as
+javaApp r (CoreSyn.Var f) as
+ = case isDataConWorkId_maybe f of {
+ Just dc | as `lengthIs` dataConRepArity dc
+ -- NOTE: Saturated constructors never returning a primitive at this point
+ --
+ -- We push the arguments backwards, because we are using
+ -- the (ugly) semantics of the order of evaluation of arguments,
+ -- to avoid making up local names. Oh to have a namesupply...
+ --
+ -> javaArgs (reverse as) ++
+ [r (New (javaIdType f)
+ (javaPops as)
+ Nothing
+ )
+ ]
+ | otherwise ->
+ -- build a local
+ let stmts =
+ vmCOLLECT (dataConRepArity dc) this ++
+ [ vmRETURN
+ (New (javaIdType f)
+ [ vmPOP ty | (Name _ ty) <- constrToFields dc ]
+ Nothing
+ )
+ ]
+ in javaArgs (reverse as) ++ [r (newCode stmts)]
+ ; other -> java_apply r (CoreSyn.Var f) as
}
-javaApp f as = java_apply f as
-
-java_apply :: CoreExpr -> [CoreExpr] -> [Statement]
-java_apply f as = [ExprStatement (vmPUSH arg) | arg <- javaArgs as] ++ javaExpr f
-
-javaArgs :: [CoreExpr] -> [Expr]
-javaArgs args = [javaArg a | a <- args, isValArg a]
+javaApp r f as = java_apply r f as
+
+-- This means, given a expression an a list of arguments,
+-- generate code for "pushing the arguments on the stack,
+-- and the executing the expression."
+
+java_apply :: (Expr -> Statement) -> CoreExpr -> [CoreExpr] -> [Statement]
+java_apply r f as = javaArgs as ++ javaExpr r f
+
+-- This generates statements that have the net effect
+-- of pushing values (perhaps thunks) onto the stack.
+
+javaArgs :: [CoreExpr] -> [Statement]
+javaArgs args = concat [ java_expr PushExpr a | a <- args, isValArg a]
+
+javaPops :: [CoreExpr] -> [Expr]
+javaPops args = [ vmPOP (primRepToType (Type.typePrimRep (CoreUtils.exprType a)))
+ | a <- args
+ , isValArg a
+ ]
+
+
+-- The result is a list of statments that have the effect of
+-- pushing onto the stack (via one of the VM.PUSH* commands)
+-- the argument, (or returning, or setting a variable)
+-- perhaps thunked.
+
+{- This is mixing two things.
+ (1) Optimizations for things like primitives, whnf calls, etc.
+ (2) If something needs a thunk constructor round it.
+ - Seperate them at some point!
+ -}
+data ExprRetStyle = SetVar Name | PushExpr | ReturnExpr
+
+java_expr :: ExprRetStyle -> CoreExpr -> [Statement]
+java_expr _ (CoreSyn.Type t) = pprPanic "java_expr" (ppr t)
+java_expr ret e
+ | isPrimCall = [push (fromJust maybePrim)]
+ -- This is a shortcut,
+ -- basic names and literals do not need a code block
+ -- to compute the value.
+ | isPrim primty && CoreUtils.exprIsTrivial e = javaExpr push e
+ | isPrim primty =
+ let expr = javaExpr vmRETURN e
+ code = access (vmWHNF (newCode expr)) (primRepToType primty)
+ in [push code]
+ | otherwise =
+ let expr = javaExpr vmRETURN e
+ code = newCode expr
+ code' = if CoreUtils.exprIsValue e
+ || CoreUtils.exprIsTrivial e
+ || isPrim primty
+ then code
+ else newThunk code
+ in [push code']
+ where
+ maybePrim = findFnPrim e []
+ isPrimCall = isJust maybePrim
+
+ push e = case ret of
+ SetVar name -> var [Final] name e
+ PushExpr -> vmPUSH e
+ ReturnExpr -> vmRETURN e
+ corety = CoreUtils.exprType e
+ primty = Type.typePrimRep corety
+ isPrim PtrRep = False -- only this needs updated
+ isPrim _ = True
+
+coreTypeToType = primRepToType . Type.typePrimRep . CoreUtils.exprType
+
+renameForKeywords :: (NamedThing name) => name -> String
+renameForKeywords name
+ | str `elem` keywords = "zdk" ++ str
+ | otherwise = str
+ where
+ str = getOccString name
+
+keywords :: [String]
+keywords =
+ [ "return"
+ , "if"
+ , "then"
+ , "else"
+ , "class"
+ , "instance"
+ , "import"
+ , "throw"
+ , "try"
+ ]
-javaArg :: CoreExpr -> Expr
-javaArg (CoreSyn.Type t) = pprPanic "javaArg" (ppr t)
-javaArg e | exprIsValue e || exprIsTrivial e = newCode (javaExpr e)
- | otherwise = newThunk (newCode (javaExpr e))
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-true, this :: Expr
-this = Var thisName
-
-true = Var "true"
+true, this,javaNull :: Expr
+this = Var thisName
+true = Var (Name "true" (PrimType PrimBoolean))
+javaNull = Var (Name "null" objectType)
vmCOLLECT :: Int -> Expr -> [Statement]
vmCOLLECT 0 e = []
-vmCOLLECT n e = [ExprStatement (Call (Var vmName) "COLLECT" [Literal (IntLit n), e])]
+vmCOLLECT n e = [ExprStatement
+ (Call varVM collectName
+ [ Literal (IntLit (toInteger n))
+ , e
+ ]
+ )
+ ]
+
+vmPOP :: Type -> Expr
+vmPOP ty = Call varVM (Name ("POP" ++ suffix ty) ty) []
+
+vmPUSH :: Expr -> Statement
+vmPUSH e = ExprStatement
+ (Call varVM (Name ("PUSH" ++ suffix (exprType e)) void) [e])
+
+vmRETURN :: Expr -> Statement
+vmRETURN e = Return (
+ case ty of
+ PrimType _ -> Call varVM (Name ("RETURN" ++ suffix ty)
+ valueType
+ ) [e]
+ _ -> e)
+ where
+ ty = exprType e
-vmPOP :: Expr
-vmPOP = Call (Var vmName) "POP" []
+var :: [Modifier] -> Name -> Expr -> Statement
+var ms field_name@(Name _ ty) value
+ | exprType value == ty = Declaration (Field ms field_name (Just value))
+ | otherwise = var ms field_name (Cast ty value)
-vmPUSH :: Expr -> Expr
-vmPUSH e = Call (Var vmName) "PUSH" [e]
+vmWHNF :: Expr -> Expr
+vmWHNF e = Call varVM whnfName [e]
-var :: [Modifier] -> Type -> Name -> Expr -> Statement
-var ms ty field_name value = Declaration (Field ms ty field_name (Just value))
+suffix :: Type -> String
+suffix (PrimType t) = primName t
+suffix _ = ""
-vmWHNF :: Expr -> Expr
-vmWHNF e = Call (Var vmName) "WHNF" [e]
+primName :: PrimType -> String
+primName PrimInt = "int"
+primName PrimChar = "char"
+primName PrimByte = "byte"
+primName PrimBoolean = "boolean"
+primName _ = error "unsupported primitive"
+
+varVM :: Expr
+varVM = Var vmName
instanceOf :: Id -> DataCon -> Expr
instanceOf x data_con
newCode :: [Statement] -> Expr
newCode [Return e] = e
-newCode stmts = New codeType [] (Just [Method [Public] objectType enterName [] stmts])
+newCode stmts = New codeType [] (Just [Method [Public] enterName [vmArg] [excName] stmts])
newThunk :: Expr -> Expr
newThunk e = New thunkType [e] Nothing
+
+vmArg :: Parameter
+vmArg = Parameter [Final] vmName
+
+-- This is called with boolean compares, checking
+-- to see if we can do an obvious shortcut.
+-- If there is, we return a (GOO) expression for doing this,
+
+-- So if, we have case (#< x y) of { True -> e1; False -> e2 },
+-- we will call findCmpFn with (#< x y), this return Just (Op x "<" y)
+
+findCmpPrim :: CoreExpr -> [Expr] -> Maybe Expr
+findCmpPrim (CoreSyn.App f a) as =
+ case a of
+ CoreSyn.Var v -> findCmpPrim f (javaVar v:as)
+ CoreSyn.Lit l -> findCmpPrim f (javaLit l:as)
+ _ -> Nothing
+findCmpPrim (CoreSyn.Var p) as =
+ case isPrimOpId_maybe p of
+ Just prim -> find_cmp_prim prim as
+ Nothing -> Nothing
+findCmpPrim _ as = Nothing
+
+find_cmp_prim cmpPrim args@[a,b] =
+ case cmpPrim of
+ IntGtOp -> fn ">"
+ IntGeOp -> fn ">="
+ IntEqOp -> fn "=="
+ IntNeOp -> fn "/="
+ IntLtOp -> fn "<"
+ IntLeOp -> fn "<="
+ _ -> Nothing
+ where
+ fn op = Just (Op a op b)
+find_cmp_prim _ _ = Nothing
+
+findFnPrim :: CoreExpr -> [Expr] -> Maybe Expr
+findFnPrim (CoreSyn.App f a) as =
+ case a of
+ CoreSyn.Var v -> findFnPrim f (javaVar v:as)
+ CoreSyn.Lit l -> findFnPrim f (javaLit l:as)
+ _ -> Nothing
+findFnPrim (CoreSyn.Var p) as =
+ case isPrimOpId_maybe p of
+ Just prim -> find_fn_prim prim as
+ Nothing -> Nothing
+findFnPrim _ as = Nothing
+
+find_fn_prim cmpPrim args@[a,b] =
+ case cmpPrim of
+ IntAddOp -> fn "+"
+ IntSubOp -> fn "-"
+ IntMulOp -> fn "*"
+ _ -> Nothing
+ where
+ fn op = Just (Op a op b)
+find_fn_prim _ _ = Nothing
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{Haskell to Java Types}
+%* *
+%************************************************************************
+
+\begin{code}
+exprType (Var (Name _ t)) = t
+exprType (Literal lit) = litType lit
+exprType (Cast t _) = t
+exprType (New t _ _) = t
+exprType (Call _ (Name _ t) _) = t
+exprType (Access _ (Name _ t)) = t
+exprType (Raise t _) = error "do not know the type of raise!"
+exprType (Op _ op _) | op `elem` ["==","/=","<","<=","=>",">"]
+ = PrimType PrimBoolean
+exprType (Op x op _) | op `elem` ["+","-","*"]
+ = exprType x
+exprType expr = error ("can't figure out an expression type: " ++ show expr)
+
+litType (IntLit i) = PrimType PrimInt
+litType (CharLit i) = PrimType PrimChar
+litType (StringLit i) = stringType -- later, might use char array?
\end{code}
%************************************************************************
%************************************************************************
\begin{code}
-codeName, enterName, vmName :: Name
-codeName = "Code"
-thunkName = "Thunk"
-enterName = "ENTER"
-vmName = "VM"
-thisName = "this"
+codeName, excName, thunkName :: TypeName
+codeName = "haskell.runtime.Code"
+thunkName = "haskell.runtime.Thunk"
+excName = "java.lang.Exception"
+
+enterName, vmName,thisName,collectName, whnfName :: Name
+enterName = Name "ENTER" objectType
+vmName = Name "VM" vmType
+thisName = Name "this" (Type "<this>")
+collectName = Name "COLLECT" void
+whnfName = Name "WHNF" objectType
+
+fieldName :: Int -> Type -> Name -- Names for fields of a constructor
+fieldName n ty = Name ("f" ++ show n) ty
+
+withType :: Name -> Type -> Name
+withType (Name n _) t = Name n t
+
+-- This maps (local only) names Ids to Names,
+-- using the same string as the Id.
+javaName :: Id -> Name
+javaName n
+ | isExternalName (idName n) = error "useing javaName on global"
+ | otherwise = Name (getOccString n)
+ (primRepToType (idPrimRep n))
+
+-- TypeName's are almost always global. This would typically return something
+-- like Test.foo or Test.Foozdc or PrelBase.foldr.
+-- Local might use locally bound types, (which do not have '.' in them).
+
+javaIdTypeName :: Id -> TypeName
+javaIdTypeName n
+ | isInternalName n' = renameForKeywords n'
+ | otherwise = moduleString (nameModule n') ++ "." ++ renameForKeywords n'
+ where
+ n' = getName n
-fieldName :: Int -> Name -- Names for fields of a constructor
-fieldName n = "f" ++ show n
+-- There is no such thing as a local type constructor.
-javaName :: NamedThing a => a -> Name
-javaName n = getOccString n
+javaTyConTypeName :: TyCon -> TypeName
+javaTyConTypeName n = (moduleString (nameModule n') ++ "." ++ renameForKeywords n')
+ where
+ n' = getName n
-javaConstrWkrName :: DataCon -> Name
--- The function that makes the constructor
-javaConstrWkrName con = getOccString (dataConId con)
+-- this is used for getting the name of a class when defining it.
+shortName :: TypeName -> TypeName
+shortName = reverse . takeWhile (/= '.') . reverse
+
+-- The function that makes the constructor name
+-- The constructor "Foo ..." in module Test,
+-- would return the name "Test.Foo".
+
+javaConstrWkrName :: DataCon -> TypeName
+javaConstrWkrName = javaIdTypeName . dataConWorkId
-javaInstName :: NamedThing a => a -> Name
-- Makes x_inst for Rec decls
-javaInstName n = getOccString n ++ "_inst"
+-- They are *never* is primitive
+-- and always have local (type) names.
+javaInstName :: Id -> Name
+javaInstName n = Name (renameForKeywords n ++ "zdi_inst")
+ (Type (renameForKeywords n))
\end{code}
%************************************************************************
%* *
-\subsection{Type mangling}
+\subsection{Types and type mangling}
%* *
%************************************************************************
\begin{code}
-javaType :: NamedThing a => a -> Type
-javaType n = Type [javaName n]
-
+-- Haskell RTS types
+codeType, thunkType, valueType :: Type
+codeType = Type codeName
+thunkType = Type thunkName
+valueType = Type "haskell.runtime.Value"
+vmType = Type "haskell.runtime.VMEngine"
+
+-- Basic Java types
+objectType, stringType :: Type
+objectType = Type "java.lang.Object"
+stringType = Type "java.lang.String"
+
+void :: Type
+void = PrimType PrimVoid
+
+inttype :: Type
+inttype = PrimType PrimInt
+
+chartype :: Type
+chartype = PrimType PrimChar
+
+bytetype :: Type
+bytetype = PrimType PrimByte
+
+-- This lets you get inside a possible "Value" type,
+-- to access the internal unboxed object.
+access :: Expr -> Type -> Expr
+access expr (PrimType prim) = accessPrim (Cast valueType expr) prim
+access expr other = expr
+
+accessPrim expr PrimInt = Call expr (Name "intValue" inttype) []
+accessPrim expr PrimChar = Call expr (Name "charValue" chartype) []
+accessPrim expr PrimByte = Call expr (Name "byteValue" bytetype) []
+accessPrim expr other = pprPanic "accessPrim" (text (show other))
+
+-- This is where we map from typename to types,
+-- allowing to match possible primitive types.
+mkType :: TypeName -> Type
+mkType "PrelGHC.Intzh" = inttype
+mkType "PrelGHC.Charzh" = chartype
+mkType other = Type other
+
+-- Turns a (global) Id into a Type (fully qualified name).
+javaIdType :: Id -> Type
+javaIdType = mkType . javaIdTypeName
+
+javaLocalIdType :: Id -> Type
+javaLocalIdType = primRepToType . idPrimRep
+
+primRepToType ::PrimRep -> Type
+primRepToType PtrRep = objectType
+primRepToType IntRep = inttype
+primRepToType CharRep = chartype
+primRepToType Int8Rep = bytetype
+primRepToType AddrRep = objectType
+primRepToType other = pprPanic "primRepToType" (ppr other)
+
+-- The function that makes the constructor name
javaConstrWkrType :: DataCon -> Type
--- The function that makes the constructor
-javaConstrWkrType con = Type [javaConstrWkrName con]
-
-codeType, thunkType, objectType :: Type
-objectType = Type ["Object"]
-codeType = Type [codeName]
-thunkType = Type [thunkName]
+javaConstrWkrType con = Type (javaConstrWkrName con)
\end{code}
%************************************************************************
combineEnv :: Env -> [Name] -> Env
combineEnv (Env bound env) new = Env (bound `combine` new) env
-addTypeMapping :: Name -> Name -> [Name] -> Env -> Env
-addTypeMapping origName newName frees (Env bound env)
+addTypeMapping :: TypeName -> TypeName -> [Name] -> Env -> Env
+addTypeMapping origName newName frees (Env bound env)
= Env bound ((origName,(newName,frees)) : env)
-data Env = Env Bound [(Name,(Name,[Name]))]
+-- This a list of bound vars (with types)
+-- and a mapping from old class name
+-- to inner class name (with a list of frees that need passed
+-- to the inner class.)
+
+data Env = Env Bound [(TypeName,(TypeName,[Name]))]
newtype LifterM a =
LifterM { unLifterM ::
- Name ->
- Int -> ( a -- *
+ TypeName -> -- this class name
+ Int -> -- uniq supply
+ ( a -- *
, Frees -- frees
, [Decl] -- lifted classes
, Int -- The uniqs
, s)
)
-access :: Env -> Name -> LifterM ()
-access env@(Env bound _) name
+liftAccess :: Env -> Name -> LifterM ()
+liftAccess env@(Env bound _) name
| name `elem` bound = LifterM (\ n s -> ((),[name],[],s))
| otherwise = return ()
-scopedName :: Name -> LifterM a -> LifterM a
+scopedName :: TypeName -> LifterM a -> LifterM a
scopedName name (LifterM m) =
LifterM (\ _ s ->
case m name 1 of
(a,frees,lifted,_) -> (a,frees,lifted,s)
)
-genAnonInnerClassName :: LifterM Name
+genAnonInnerClassName :: LifterM TypeName
genAnonInnerClassName = LifterM (\ n s ->
( n ++ "$" ++ show s
, []
)
)
-genInnerClassName :: Name -> LifterM Name
+genInnerClassName :: TypeName -> LifterM TypeName
genInnerClassName name = LifterM (\ n s ->
( n ++ "$" ++ name
, []
liftCompilationUnit :: CompilationUnit -> CompilationUnit
-liftCompilationUnit (Package name ds) =
- case unLifterM (liftDecls True (Env [] []) ds) [] 1 of
- (ds,_,ds',_) -> Package name (ds ++ ds')
+liftCompilationUnit (Package name ds) =
+ Package name (concatMap liftCompilationUnit' ds)
+
+liftCompilationUnit' :: Decl -> [Decl]
+liftCompilationUnit' decl =
+ case unLifterM (liftDecls True (Env [] []) [decl]) [] 1 of
+ (ds,_,ds',_) -> ds ++ ds'
+
-- The bound vars for the current class have
-- already be captured before calling liftDecl,
liftDecl = \ top env decl ->
case decl of
{ Import n -> return (Import n)
- ; Field mfs t n e ->
+ ; Field mfs n e ->
do { e <- liftMaybeExpr env e
- ; return (Field mfs (liftType env t) n e)
+ ; return (Field mfs (liftName env n) e)
}
; Constructor mfs n as ss ->
do { let newBound = getBoundAtParameters as
; (ss,_) <- liftStatements (combineEnv env newBound) ss
; return (Constructor mfs n (liftParameters env as) ss)
}
- ; Method mfs t n as ss ->
+ ; Method mfs n as ts ss ->
do { let newBound = getBoundAtParameters as
; (ss,_) <- liftStatements (combineEnv env newBound) ss
- ; return (Method mfs (liftType env t) n (liftParameters env as) ss)
+ ; return (Method mfs (liftName env n) (liftParameters env as) ts ss)
}
; Comment s -> return (Comment s)
; Interface mfs n is ms -> error "interfaces not supported"
getBoundAtDecls :: [Decl] -> Bound
getBoundAtDecls = foldr combine [] . map getBoundAtDecl
--- TODO
getBoundAtDecl :: Decl -> Bound
-getBoundAtDecl (Field _ _ n _) = [n]
-getBoundAtDecl _ = []
+getBoundAtDecl (Field _ n _) = [n]
+getBoundAtDecl _ = []
getBoundAtParameters :: [Parameter] -> Bound
getBoundAtParameters = foldr combine [] . map getBoundAtParameter
-- TODO
getBoundAtParameter :: Parameter -> Bound
-getBoundAtParameter (Parameter _ _ n) = [n]
+getBoundAtParameter (Parameter _ n) = [n]
+
liftStatement :: Env -> Statement -> LifterM (Statement,Env)
liftStatement = \ env stmt ->
; ExprStatement e -> do { e <- liftExpr env e
; return (ExprStatement e,env)
}
- ; Declaration decl@(Field mfs t n e) ->
+ ; Declaration decl@(Field mfs n e) ->
do { e <- liftMaybeExpr env e
- ; return ( Declaration (Field mfs t n e)
+ ; return ( Declaration (Field mfs (liftName env n) e)
, env `combineEnv` getBoundAtDecl decl
)
}
; return (s:ss,env)
}
-
liftExpr :: Env -> Expr -> LifterM Expr
liftExpr = \ env expr ->
case expr of
- { Var n -> do { access env n
- ; return (Var n)
+ { Var n -> do { liftAccess env n
+ ; return (Var (liftName env n))
}
; Literal l -> return expr
; Cast t e -> do { e <- liftExpr env e
; InstanceOf e t -> do { e <- liftExpr env e
; return (InstanceOf e (liftType env t))
}
+ ; Raise n es -> do { es <- liftExprs env es
+ ; return (Raise n es)
+ }
; Call e n es -> do { e <- liftExpr env e
; es <- mapM (liftExpr env) es
; return (Call e n es)
}
; Op e1 o e2 -> do { e1 <- liftExpr env e1
- ; e2 <- liftExpr env e1
+ ; e2 <- liftExpr env e2
; return (Op e1 o e2)
}
; New n es ds -> new env n es ds
- ; NewArray n es -> error "array not (yet) supported"
}
-liftParameter env (Parameter ms t n) = Parameter ms (liftType env t) n
+liftParameter env (Parameter ms n) = Parameter ms (liftName env n)
liftParameters env = map (liftParameter env)
+liftName env (Name n t) = Name n (liftType env t)
+
liftExprs :: Env -> [Expr] -> LifterM [Expr]
liftExprs = mapM . liftExpr
+
liftMaybeExpr :: Env -> (Maybe Expr) -> LifterM (Maybe Expr)
liftMaybeExpr env Nothing = return Nothing
liftMaybeExpr env (Just stmt) = do { stmt <- liftExpr env stmt
}
+
new :: Env -> Type -> [Expr] -> Maybe [Decl] -> LifterM Expr
new env@(Env _ pairs) typ args Nothing =
do { args <- liftExprs env args
- ; return (mkNew env typ args)
+ ; return (liftNew env typ args)
}
new env typ [] (Just inner) =
-- anon. inner class
do { innerName <- genAnonInnerClassName
- ; frees <- liftClass env innerName inner [unType typ] []
- ; return (New (Type [innerName]) [ Var name | name <- frees ] Nothing)
+ ; frees <- liftClass env innerName inner [] [unType typ]
+ ; return (New (Type (innerName))
+ (map Var frees)
+ Nothing)
}
- where unType (Type [name]) = name
+ where unType (Type name) = name
unType _ = error "incorrect type style"
-
new env typ _ (Just inner) = error "cant handle inner class with args"
-liftClass :: Env -> Name -> [Decl] -> [Name] -> [Name] -> LifterM [ Name ]
+
+liftClass :: Env -> TypeName -> [Decl] -> [TypeName] -> [TypeName] -> LifterM [ Name ]
liftClass env@(Env bound _) innerName inner xs is =
do { let newBound = getBoundAtDecls inner
; (inner,frees) <-
getFrees (liftDecls False (env `combineEnv` newBound) inner)
- ; let trueFrees = both frees bound
- ; let mirrorFrees = [ "_" ++ name ++ "_" | name <- trueFrees ]
- ; let freeDefs = [ Field [Final] objectType n Nothing | n <- trueFrees ]
- ; let cons = Constructor [Public] innerName
- [ Parameter [] objectType name | name <- mirrorFrees ]
- [ ExprStatement (Assign (Var true) (Var mirror))
- | (true,mirror) <- zip trueFrees mirrorFrees
- ]
+ ; let trueFrees = filter (\ (Name xs _) -> xs /= "VM") (both frees bound)
+ ; let freeDefs = [ Field [Final] n Nothing | n <- trueFrees ]
+ ; let cons = mkCons innerName trueFrees
; let innerClass = Class [] innerName xs is (freeDefs ++ [cons] ++ inner)
; rememberClass innerClass
; return trueFrees
}
liftType :: Env -> Type -> Type
-liftType (Env _ env) typ@(Type [name])
+liftType (Env _ env) typ@(Type name)
= case lookup name env of
Nothing -> typ
- Just (nm,_) -> Type [nm]
+ Just (nm,_) -> Type nm
liftType _ typ = typ
-mkNew :: Env -> Type -> [Expr] -> Expr
-mkNew (Env _ env) typ@(Type [name]) exprs
+liftNew :: Env -> Type -> [Expr] -> Expr
+liftNew (Env _ env) typ@(Type name) exprs
= case lookup name env of
Nothing -> New typ exprs Nothing
Just (nm,args) | null exprs
- -> New (Type [nm]) (map Var args) Nothing
+ -> New (Type nm) (map Var args) Nothing
_ -> error "pre-lifted constructor with arguments"
-mkNew _ typ exprs = New typ exprs Nothing
\end{code}
projects / ghc-hetmet.git / blobdiff