-{-
+{- -*-haskell-*-
-----------------------------------------------------------------------------
-$Id: Parser.y,v 1.70 2001/07/12 16:21:23 simonpj Exp $
+$Id: Parser.y,v 1.83 2002/02/04 03:40:32 chak Exp $
Haskell grammar.
-}
{
-module Parser ( parseModule, parseStmt ) where
+module Parser ( parseModule, parseStmt, parseIdentifier ) where
import HsSyn
import HsTypes ( mkHsTupCon )
import OccName ( UserFS, varName, tcName, dataName, tcClsName, tvName )
import SrcLoc ( SrcLoc )
import Module
-import Demand ( StrictnessMark(..) )
import CmdLineOpts ( opt_SccProfilingOn )
-import BasicTypes ( Boxity(..), Fixity(..), FixityDirection(..), NewOrData(..) )
+import BasicTypes ( Boxity(..), Fixity(..), FixityDirection(..), IPName(..),
+ NewOrData(..), StrictnessMark(..), Activation(..) )
import Panic
import GlaExts
{-
-----------------------------------------------------------------------------
-Conflicts: 14 shift/reduce
- (note: it's currently 21 -- JRL, 31/1/2000)
+Conflicts: 21 shift/reduce, -=chak[4Feb2]
8 for abiguity in 'if x then y else z + 1'
(shift parses as 'if x then y else (z + 1)', as per longest-parse rule)
Only sensible parse is 'x @ (Rec{..})', which is what resolving
to shift gives us.
+6 for conflicts between `fdecl' and `fdeclDEPRECATED', which are resolved
+ correctly, and moreover, should go away when `fdeclDEPRECATED' is removed.
+
-----------------------------------------------------------------------------
-}
'export' { ITexport }
'label' { ITlabel }
'dynamic' { ITdynamic }
+ 'safe' { ITsafe }
'unsafe' { ITunsafe }
'with' { ITwith }
'stdcall' { ITstdcallconv }
'__A' { ITarity }
'__P' { ITspecialise }
'__C' { ITnocaf }
- '__U' { ITunfold $$ }
+ '__U' { ITunfold }
'__S' { ITstrict $$ }
'__M' { ITcprinfo $$ }
-}
QVARSYM { ITqvarsym $$ }
QCONSYM { ITqconsym $$ }
- IPVARID { ITipvarid $$ } -- GHC extension
+ IPDUPVARID { ITdupipvarid $$ } -- GHC extension
+ IPSPLITVARID { ITsplitipvarid $$ } -- GHC extension
CHAR { ITchar $$ }
STRING { ITstring $$ }
%lexer { lexer } { ITeof }
%name parseModule module
%name parseStmt maybe_stmt
+%name parseIdentifier identifier
%tokentype { Token }
%%
{ RdrHsDecl (TyClD (TySynonym (fst $3) (snd $3) $5 $1)) }
| srcloc 'data' ctype constrs deriving
- {% checkDataHeader $3 `thenP` \(cs,c,ts) ->
+ {% checkDataHeader "data" $3 `thenP` \(cs,c,ts) ->
returnP (RdrHsDecl (TyClD
(mkTyData DataType cs c ts (reverse $4) (length $4) $5 $1))) }
| srcloc 'newtype' ctype '=' newconstr deriving
- {% checkDataHeader $3 `thenP` \(cs,c,ts) ->
+ {% checkDataHeader "newtype" $3 `thenP` \(cs,c,ts) ->
returnP (RdrHsDecl (TyClD
(mkTyData NewType cs c ts [$5] 1 $6 $1))) }
| srcloc 'class' ctype fds where
- {% checkDataHeader $3 `thenP` \(cs,c,ts) ->
+ {% checkDataHeader "class" $3 `thenP` \(cs,c,ts) ->
let
(binds,sigs) = cvMonoBindsAndSigs cvClassOpSig (groupBindings $5)
in
in RdrHsDecl (InstD (InstDecl $3 binds sigs Nothing $1)) }
| srcloc 'default' '(' types0 ')' { RdrHsDecl (DefD (DefaultDecl $4 $1)) }
- | 'foreign' fordecl { RdrHsDecl $2 }
+ | 'foreign' fdecl { RdrHsDecl $2 }
| '{-# DEPRECATED' deprecations '#-}' { $2 }
| '{-# RULES' rules '#-}' { $2 }
| decl { $1 }
-fordecl :: { RdrNameHsDecl }
-fordecl : srcloc 'label' ext_name varid '::' sigtype
- { ForD (ForeignImport $4 $6 (LblImport ($3 `orElse` mkExtName $4)) $1) }
-
-
- ----------- ccall/stdcall decls ------------
- | srcloc 'import' ccallconv ext_name unsafe_flag varid_no_unsafe '::' sigtype
- { let
- call_spec = CCallSpec (StaticTarget ($4 `orElse` mkExtName $6)) $3 $5
- in
- ForD (ForeignImport $6 $8 (CImport call_spec) $1)
- }
-
- | srcloc 'import' ccallconv 'dynamic' unsafe_flag varid_no_unsafe '::' sigtype
- { let
- call_spec = CCallSpec DynamicTarget $3 $5
- in
- ForD (ForeignImport $6 $8 (CImport call_spec) $1)
- }
-
- | srcloc 'export' ccallconv ext_name varid '::' sigtype
- { ForD (ForeignExport $5 $7 (CExport (CExportStatic ($4 `orElse` mkExtName $5) $3)) $1) }
-
- | srcloc 'export' ccallconv 'dynamic' varid '::' sigtype
- { ForD (ForeignImport $5 $7 (CDynImport $3) $1) }
-
-
- ----------- .NET decls ------------
- | srcloc 'import' 'dotnet' ext_name varid '::' sigtype
- { ForD (ForeignImport $5 $7 (DNImport (DNCallSpec ($4 `orElse` mkExtName $5))) $1) }
-
- | srcloc 'import' 'dotnet' 'type' ext_name tycon
- { TyClD (ForeignType $6 $5 DNType $1) }
+-- for the time being, the following accepts foreign declarations conforming
+-- to the FFI Addendum, Version 1.0 as well as pre-standard declarations
+--
+-- * a flag indicates whether pre-standard declarations have been used and
+-- triggers a deprecation warning further down the road
+--
+-- NB: The first two rules could be combined into one by replacing `safety1'
+-- with `safety'. However, the combined rule conflicts with the
+-- DEPRECATED rules.
+--
+fdecl :: { RdrNameHsDecl }
+fdecl : srcloc 'import' callconv safety1 fspec {% mkImport $3 $4 $5 $1 }
+ | srcloc 'import' callconv fspec {% mkImport $3 PlaySafe $4 $1 }
+ | srcloc 'export' callconv fspec {% mkExport $3 $4 $1 }
+ -- the following syntax is DEPRECATED
+ | srcloc fdecl1DEPRECATED { ForD ($2 True $1) }
+ | srcloc fdecl2DEPRECATED { $2 $1 }
+
+fdecl1DEPRECATED :: { Bool -> SrcLoc -> ForeignDecl RdrName }
+fdecl1DEPRECATED
+ ----------- DEPRECATED label decls ------------
+ : 'label' ext_name varid '::' sigtype
+ { ForeignImport $3 $5 (CImport defaultCCallConv PlaySafe _NIL_ _NIL_
+ (CLabel ($2 `orElse` mkExtName $3))) }
+
+ ----------- DEPRECATED ccall/stdcall decls ------------
+ --
+ -- NB: This business with the case expression below may seem overly
+ -- complicated, but it is necessary to avoid some conflicts.
+
+ -- DEPRECATED variant #1: lack of a calling convention specification
+ -- (import)
+ | 'import' {-no callconv-} ext_name safety varid_no_unsafe '::' sigtype
+ { let
+ target = StaticTarget ($2 `orElse` mkExtName $4)
+ in
+ ForeignImport $4 $6 (CImport defaultCCallConv $3 _NIL_ _NIL_
+ (CFunction target)) }
+
+ -- DEPRECATED variant #2: external name consists of two separate strings
+ -- (module name and function name) (import)
+ | 'import' callconv STRING STRING safety varid_no_unsafe '::' sigtype
+ {% case $2 of
+ DNCall -> parseError "Illegal format of .NET foreign import"
+ CCall cconv -> returnP $
+ let
+ imp = CFunction (StaticTarget $4)
+ in
+ ForeignImport $6 $8 (CImport cconv $5 _NIL_ _NIL_ imp) }
+
+ -- DEPRECATED variant #3: `unsafe' after entity
+ | 'import' callconv STRING 'unsafe' varid_no_unsafe '::' sigtype
+ {% case $2 of
+ DNCall -> parseError "Illegal format of .NET foreign import"
+ CCall cconv -> returnP $
+ let
+ imp = CFunction (StaticTarget $3)
+ in
+ ForeignImport $5 $7 (CImport cconv PlayRisky _NIL_ _NIL_ imp) }
+
+ -- DEPRECATED variant #4: use of the special identifier `dynamic' without
+ -- an explicit calling convention (import)
+ | 'import' {-no callconv-} 'dynamic' safety varid_no_unsafe '::' sigtype
+ { ForeignImport $4 $6 (CImport defaultCCallConv $3 _NIL_ _NIL_
+ (CFunction DynamicTarget)) }
+
+ -- DEPRECATED variant #5: use of the special identifier `dynamic' (import)
+ | 'import' callconv 'dynamic' safety varid_no_unsafe '::' sigtype
+ {% case $2 of
+ DNCall -> parseError "Illegal format of .NET foreign import"
+ CCall cconv -> returnP $
+ ForeignImport $5 $7 (CImport cconv $4 _NIL_ _NIL_
+ (CFunction DynamicTarget)) }
+
+ -- DEPRECATED variant #6: lack of a calling convention specification
+ -- (export)
+ | 'export' {-no callconv-} ext_name varid '::' sigtype
+ { ForeignExport $3 $5 (CExport (CExportStatic ($2 `orElse` mkExtName $3)
+ defaultCCallConv)) }
+
+ -- DEPRECATED variant #7: external name consists of two separate strings
+ -- (module name and function name) (export)
+ | 'export' callconv STRING STRING varid '::' sigtype
+ {% case $2 of
+ DNCall -> parseError "Illegal format of .NET foreign import"
+ CCall cconv -> returnP $
+ ForeignExport $5 $7
+ (CExport (CExportStatic $4 cconv)) }
+
+ -- DEPRECATED variant #8: use of the special identifier `dynamic' without
+ -- an explicit calling convention (export)
+ | 'export' {-no callconv-} 'dynamic' varid '::' sigtype
+ { ForeignImport $3 $5 (CImport defaultCCallConv PlaySafe _NIL_ _NIL_
+ CWrapper) }
+
+ -- DEPRECATED variant #9: use of the special identifier `dynamic' (export)
+ | 'export' callconv 'dynamic' varid '::' sigtype
+ {% case $2 of
+ DNCall -> parseError "Illegal format of .NET foreign import"
+ CCall cconv -> returnP $
+ ForeignImport $4 $6 (CImport cconv PlaySafe _NIL_ _NIL_ CWrapper) }
+
+ ----------- DEPRECATED .NET decls ------------
+ -- NB: removed the .NET call declaration, as it is entirely subsumed
+ -- by the new standard FFI declarations
+
+fdecl2DEPRECATED :: { SrcLoc -> RdrNameHsDecl }
+fdecl2DEPRECATED
+ : 'import' 'dotnet' 'type' ext_name tycon
+ { \loc -> TyClD (ForeignType $5 $4 DNType loc) }
+ -- left this one unchanged for the moment as type imports are not
+ -- covered currently by the FFI standard -=chak
decls :: { [RdrBinding] }
: decls ';' decl { $3 : $1 }
decl :: { RdrBinding }
: fixdecl { $1 }
| valdef { $1 }
- | '{-# INLINE' srcloc opt_phase qvar '#-}' { RdrSig (InlineSig $4 $3 $2) }
- | '{-# NOINLINE' srcloc opt_phase qvar '#-}' { RdrSig (NoInlineSig $4 $3 $2) }
+ | '{-# INLINE' srcloc activation qvar '#-}' { RdrSig (InlineSig True $4 $3 $2) }
+ | '{-# NOINLINE' srcloc inverse_activation qvar '#-}' { RdrSig (InlineSig False $4 $3 $2) }
| '{-# SPECIALISE' srcloc qvar '::' sigtypes '#-}'
{ foldr1 RdrAndBindings
(map (\t -> RdrSig (SpecSig $3 t $2)) $5) }
| '{-# SPECIALISE' srcloc 'instance' inst_type '#-}'
{ RdrSig (SpecInstSig $4 $2) }
-opt_phase :: { Maybe Int }
- : INTEGER { Just (fromInteger $1) }
- | {- empty -} { Nothing }
-
wherebinds :: { RdrNameHsBinds }
: where { cvBinds cvValSig (groupBindings $1) }
| {- empty -} { RdrNullBind }
rule :: { RdrBinding }
- : STRING rule_forall infixexp '=' srcloc exp
- { RdrHsDecl (RuleD (HsRule $1 [] $2 $3 $6 $5)) }
+ : STRING activation rule_forall infixexp '=' srcloc exp
+ { RdrHsDecl (RuleD (HsRule $1 $2 $3 $4 $7 $6)) }
+
+activation :: { Activation } -- Omitted means AlwaysActive
+ : {- empty -} { AlwaysActive }
+ | explicit_activation { $1 }
+
+inverse_activation :: { Activation } -- Omitted means NeverActive
+ : {- empty -} { NeverActive }
+ | explicit_activation { $1 }
+
+explicit_activation :: { Activation } -- In brackets
+ : '[' INTEGER ']' { ActiveAfter (fromInteger $2) }
+ | '[' '~' INTEGER ']' { ActiveBefore (fromInteger $3) }
rule_forall :: { [RdrNameRuleBndr] }
: 'forall' rule_var_list '.' { $2 }
[ RdrHsDecl (DeprecD (Deprecation n $3 $1)) | n <- $2 ] }
-----------------------------------------------------------------------------
--- Foreign import/export
-
-ccallconv :: { CCallConv }
- : 'stdcall' { StdCallConv }
- | 'ccall' { CCallConv }
- | {- empty -} { defaultCCallConv }
-
-unsafe_flag :: { Safety }
- : 'unsafe' { PlayRisky }
- | {- empty -} { PlaySafe }
-
+-- Foreign declarations
+
+callconv :: { CallConv }
+ : 'stdcall' { CCall StdCallConv }
+ | 'ccall' { CCall CCallConv }
+ | 'dotnet' { DNCall }
+
+safety :: { Safety }
+ : 'unsafe' { PlayRisky }
+ | 'safe' { PlaySafe }
+ | {- empty -} { PlaySafe }
+
+safety1 :: { Safety }
+ : 'unsafe' { PlayRisky }
+ | 'safe' { PlaySafe }
+ -- only needed to avoid conflicts with the DEPRECATED rules
+
+fspec :: { (FAST_STRING, RdrName, RdrNameHsType) }
+ : STRING varid '::' sigtype { ($1 , $2, $4) }
+ | varid '::' sigtype { (SLIT(""), $1, $3) }
+ -- if the entity string is missing, it defaults to the empty string;
+ -- the meaning of an empty entity string depends on the calling
+ -- convention
+
+-- DEPRECATED syntax
ext_name :: { Maybe CLabelString }
: STRING { Just $1 }
+ | STRING STRING { Just $2 } -- Ignore "module name" for now
| {- empty -} { Nothing }
-- A ctype is a for-all type
ctype :: { RdrNameHsType }
: 'forall' tyvars '.' ctype { mkHsForAllTy (Just $2) [] $4 }
- | context type { mkHsForAllTy Nothing $1 $2 }
+ | context '=>' type { mkHsForAllTy Nothing $1 $3 }
-- A type of form (context => type) is an *implicit* HsForAllTy
| type { $1 }
newconstr :: { RdrNameConDecl }
: srcloc conid atype { mkConDecl $2 [] [] (VanillaCon [unbangedType $3]) $1 }
- | srcloc conid '{' var '::' type '}'
+ | srcloc conid '{' var '::' ctype '}'
{ mkConDecl $2 [] [] (RecCon [([$4], unbangedType $6)]) $1 }
constrs :: { [RdrNameConDecl] }
| constr { [$1] }
constr :: { RdrNameConDecl }
- : srcloc forall context constr_stuff
- { mkConDecl (fst $4) $2 $3 (snd $4) $1 }
+ : srcloc forall context '=>' constr_stuff
+ { mkConDecl (fst $5) $2 $3 (snd $5) $1 }
| srcloc forall constr_stuff
{ mkConDecl (fst $3) $2 [] (snd $3) $1 }
| {- empty -} { [] }
context :: { RdrNameContext }
- : btype '=>' {% checkContext $1 }
+ : btype {% checkContext $1 }
constr_stuff :: { (RdrName, RdrNameConDetails) }
: btype {% mkVanillaCon $1 [] }
| btype '!' atype satypes {% mkVanillaCon $1 (BangType MarkedUserStrict $3 : $4) }
+ | gtycon '{' '}' {% mkRecCon $1 [] }
| gtycon '{' fielddecls '}' {% mkRecCon $1 $3 }
| sbtype conop sbtype { ($2, InfixCon $1 $3) }
: ctype { unbangedType $1 }
| '!' atype { BangType MarkedUserStrict $2 }
-deriving :: { Maybe [RdrName] }
+deriving :: { Maybe RdrNameContext }
: {- empty -} { Nothing }
- | 'deriving' qtycls { Just [$2] }
- | 'deriving' '(' ')' { Just [] }
- | 'deriving' '(' dclasses ')' { Just (reverse $3) }
-
-dclasses :: { [RdrName] }
- : dclasses ',' qtycls { $3 : $1 }
- | qtycls { [$1] }
+ | 'deriving' context { Just $2 }
+ -- Glasgow extension: allow partial
+ -- applications in derivings
-----------------------------------------------------------------------------
-- Value definitions
exp10 :: { RdrNameHsExpr }
: '\\' srcloc aexp aexps opt_asig '->' srcloc exp
{% checkPatterns $2 ($3 : reverse $4) `thenP` \ ps ->
- returnP (HsLam (Match [] ps $5
+ returnP (HsLam (Match ps $5
(GRHSs (unguardedRHS $8 $7)
EmptyBinds placeHolderType))) }
| 'let' declbinds 'in' exp { HsLet $2 $4 }
: ipvar { HsIPVar $1 }
| var_or_con { $1 }
| literal { HsLit $1 }
- | INTEGER { HsOverLit (HsIntegral $1) }
- | RATIONAL { HsOverLit (HsFractional $1) }
+ | INTEGER { HsOverLit (mkHsIntegral $1) }
+ | RATIONAL { HsOverLit (mkHsFractional $1) }
| '(' exp ')' { HsPar $2 }
| '(' exp ',' texps ')' { ExplicitTuple ($2 : reverse $4) Boxed}
| '(#' texps '#)' { ExplicitTuple (reverse $2) Unboxed }
alt :: { RdrNameMatch }
: srcloc infixexp opt_sig ralt wherebinds
{% (checkPattern $1 $2 `thenP` \p ->
- returnP (Match [] [p] $3
+ returnP (Match [p] $3
(GRHSs $4 $5 placeHolderType)) )}
ralt :: { [RdrNameGRHS] }
-----------------------------------------------------------------------------
-- Implicit Parameter Bindings
-dbinding :: { [(RdrName, RdrNameHsExpr)] }
+dbinding :: { [(IPName RdrName, RdrNameHsExpr)] }
: '{' dbinds '}' { $2 }
| layout_on dbinds close { $2 }
-dbinds :: { [(RdrName, RdrNameHsExpr)] }
+dbinds :: { [(IPName RdrName, RdrNameHsExpr)] }
: dbinds ';' dbind { $3 : $1 }
| dbinds ';' { $1 }
| dbind { [$1] }
| {- empty -} { [] }
-dbind :: { (RdrName, RdrNameHsExpr) }
+dbind :: { (IPName RdrName, RdrNameHsExpr) }
dbind : ipvar '=' exp { ($1, $3) }
-----------------------------------------------------------------------------
-- Variables, Constructors and Operators.
+identifier :: { RdrName }
+ : qvar { $1 }
+ | gcon { $1 }
+ | qop { $1 }
+
depreclist :: { [RdrName] }
depreclist : deprec_var { [$1] }
| deprec_var ',' depreclist { $1 : $3 }
-- whether it's a qvar or a var can be postponed until
-- *after* we see the close paren.
-ipvar :: { RdrName }
- : IPVARID { (mkUnqual varName (tailFS $1)) }
+ipvar :: { IPName RdrName }
+ : IPDUPVARID { Dupable (mkUnqual varName $1) }
+ | IPSPLITVARID { Linear (mkUnqual varName $1) }
qcon :: { RdrName }
: qconid { $1 }
: tyconop { $1 }
| QCONSYM { mkQual tcClsName $1 }
-qtycls :: { RdrName }
- : qtycon { $1 }
-
commas :: { Int }
: commas ',' { $1 + 1 }
| ',' { 2 }
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