{-
-----------------------------------------------------------------------------
-$Id: Parser.y,v 1.51 2001/01/30 12:13:34 simonmar Exp $
+$Id: Parser.y,v 1.70 2001/07/12 16:21:23 simonpj Exp $
Haskell grammar.
-}
{
-module Parser ( parseModule, parseExpr ) where
+module Parser ( parseModule, parseStmt ) where
import HsSyn
import HsTypes ( mkHsTupCon )
import Lex
import ParseUtil
import RdrName
-import PrelNames
-import OccName ( UserFS, varName, ipName, tcName, dataName, tcClsName, tvName )
+import PrelNames ( mAIN_Name, unitTyCon_RDR, funTyCon_RDR, listTyCon_RDR,
+ tupleTyCon_RDR, unitCon_RDR, nilCon_RDR, tupleCon_RDR
+ )
+import ForeignCall ( Safety(..), CExportSpec(..), CCallSpec(..),
+ CCallConv(..), CCallTarget(..), defaultCCallConv,
+ DNCallSpec(..) )
+import OccName ( UserFS, varName, tcName, dataName, tcClsName, tvName )
import SrcLoc ( SrcLoc )
import Module
-import CallConv
+import Demand ( StrictnessMark(..) )
import CmdLineOpts ( opt_SccProfilingOn )
import BasicTypes ( Boxity(..), Fixity(..), FixityDirection(..), NewOrData(..) )
import Panic
import GlaExts
-import FastString ( tailFS )
+import CStrings ( CLabelString )
+import FastString
+import Maybes ( orElse )
import Outputable
#include "HsVersions.h"
'with' { ITwith }
'stdcall' { ITstdcallconv }
'ccall' { ITccallconv }
- '_ccall_' { ITccall (False, False, False) }
- '_ccall_GC_' { ITccall (False, False, True) }
- '_casm_' { ITccall (False, True, False) }
- '_casm_GC_' { ITccall (False, True, True) }
+ 'dotnet' { ITdotnet }
+ '_ccall_' { ITccall (False, False, PlayRisky) }
+ '_ccall_GC_' { ITccall (False, False, PlaySafe) }
+ '_casm_' { ITccall (False, True, PlayRisky) }
+ '_casm_GC_' { ITccall (False, True, PlaySafe) }
'{-# SPECIALISE' { ITspecialise_prag }
'{-# SOURCE' { ITsource_prag }
%monad { P } { thenP } { returnP }
%lexer { lexer } { ITeof }
%name parseModule module
-%name parseExpr exp
+%name parseStmt maybe_stmt
%tokentype { Token }
%%
| {- empty -} { [] }
importdecl :: { RdrNameImportDecl }
- : 'import' srcloc maybe_src optqualified CONID maybeas maybeimpspec
- { ImportDecl (mkModuleNameFS $5) $3 $4 $6 $7 $2 }
+ : 'import' srcloc maybe_src optqualified modid maybeas maybeimpspec
+ { ImportDecl $5 $3 $4 $6 $7 $2 }
maybe_src :: { WhereFrom }
: '{-# SOURCE' '#-}' { ImportByUserSource }
| topdecl { [$1] }
topdecl :: { RdrBinding }
- : srcloc 'type' simpletype '=' sigtype
+ : srcloc 'type' simpletype '=' ctype
+ -- Note ctype, not sigtype.
+ -- We allow an explicit for-all but we don't insert one
+ -- in type Foo a = (b,b)
+ -- Instead we just say b is out of scope
{ RdrHsDecl (TyClD (TySynonym (fst $3) (snd $3) $5 $1)) }
- | srcloc 'data' ctype '=' constrs deriving
+ | srcloc 'data' ctype constrs deriving
{% checkDataHeader $3 `thenP` \(cs,c,ts) ->
returnP (RdrHsDecl (TyClD
- (mkTyData DataType cs c ts (reverse $5) (length $5) $6 $1))) }
+ (mkTyData DataType cs c ts (reverse $4) (length $4) $5 $1))) }
| srcloc 'newtype' ctype '=' newconstr deriving
{% checkDataHeader $3 `thenP` \(cs,c,ts) ->
(groupBindings $4)
in RdrHsDecl (InstD (InstDecl $3 binds sigs Nothing $1)) }
- | srcloc 'default' '(' types0 ')'
- { RdrHsDecl (DefD (DefaultDecl $4 $1)) }
+ | srcloc 'default' '(' types0 ')' { RdrHsDecl (DefD (DefaultDecl $4 $1)) }
+ | 'foreign' fordecl { RdrHsDecl $2 }
+ | '{-# DEPRECATED' deprecations '#-}' { $2 }
+ | '{-# RULES' rules '#-}' { $2 }
+ | decl { $1 }
- | srcloc 'foreign' 'import' callconv ext_name
- unsafe_flag varid_no_unsafe '::' sigtype
- { RdrHsDecl (ForD (ForeignDecl $7 (FoImport $6) $9 (mkExtName $5 $7) $4 $1)) }
+fordecl :: { RdrNameHsDecl }
+fordecl : srcloc 'label' ext_name varid '::' sigtype
+ { ForD (ForeignImport $4 $6 (LblImport ($3 `orElse` mkExtName $4)) $1) }
- | srcloc 'foreign' 'export' callconv ext_name varid '::' sigtype
- { RdrHsDecl (ForD (ForeignDecl $6 FoExport $8 (mkExtName $5 $6) $4 $1)) }
- | srcloc 'foreign' 'label' ext_name varid '::' sigtype
- { RdrHsDecl (ForD (ForeignDecl $5 FoLabel $7 (mkExtName $4 $5)
- defaultCallConv $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)
+ }
- | '{-# DEPRECATED' deprecations '#-}' { $2 }
- | '{-# RULES' rules '#-}' { $2 }
- | decl { $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) }
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 opt_phase qvar '#-}' { RdrSig (InlineSig $4 $3 $2) }
+ | '{-# NOINLINE' srcloc opt_phase qvar '#-}' { RdrSig (NoInlineSig $4 $3 $2) }
| '{-# SPECIALISE' srcloc qvar '::' sigtypes '#-}'
{ foldr1 RdrAndBindings
(map (\t -> RdrSig (SpecSig $3 t $2)) $5) }
| {- empty -} { RdrNullBind }
rule :: { RdrBinding }
- : STRING rule_forall fexp '=' srcloc exp
+ : STRING rule_forall infixexp '=' srcloc exp
{ RdrHsDecl (RuleD (HsRule $1 [] $2 $3 $6 $5)) }
rule_forall :: { [RdrNameRuleBndr] }
-----------------------------------------------------------------------------
-- Foreign import/export
-callconv :: { Int }
- : 'stdcall' { stdCallConv }
- | 'ccall' { cCallConv }
- | {- empty -} { defaultCallConv }
+ccallconv :: { CCallConv }
+ : 'stdcall' { StdCallConv }
+ | 'ccall' { CCallConv }
+ | {- empty -} { defaultCCallConv }
-unsafe_flag :: { Bool }
- : 'unsafe' { True }
- | {- empty -} { False }
+unsafe_flag :: { Safety }
+ : 'unsafe' { PlayRisky }
+ | {- empty -} { PlaySafe }
-ext_name :: { Maybe ExtName }
- : 'dynamic' { Just Dynamic }
- | STRING { Just (ExtName $1 Nothing) }
- | STRING STRING { Just (ExtName $2 (Just $1)) }
+ext_name :: { Maybe CLabelString }
+ : STRING { Just $1 }
| {- empty -} { Nothing }
: ctype {% checkInstType $1 }
types0 :: { [RdrNameHsType] }
- : types { $1 }
+ : types { reverse $1 }
| {- empty -} { [] }
types :: { [RdrNameHsType] }
-- Datatype declarations
newconstr :: { RdrNameConDecl }
- : srcloc conid atype { mkConDecl $2 [] [] (VanillaCon [Unbanged $3]) $1 }
+ : srcloc conid atype { mkConDecl $2 [] [] (VanillaCon [unbangedType $3]) $1 }
| srcloc conid '{' var '::' type '}'
- { mkConDecl $2 [] [] (RecCon [([$4], Unbanged $6)]) $1 }
+ { mkConDecl $2 [] [] (RecCon [([$4], unbangedType $6)]) $1 }
constrs :: { [RdrNameConDecl] }
- : constrs '|' constr { $3 : $1 }
+ : {- empty; a GHC extension -} { [] }
+ | '=' constrs1 { $2 }
+
+constrs1 :: { [RdrNameConDecl] }
+ : constrs1 '|' constr { $3 : $1 }
| constr { [$1] }
constr :: { RdrNameConDecl }
constr_stuff :: { (RdrName, RdrNameConDetails) }
: btype {% mkVanillaCon $1 [] }
- | btype '!' atype satypes {% mkVanillaCon $1 (Banged $3 : $4) }
+ | btype '!' atype satypes {% mkVanillaCon $1 (BangType MarkedUserStrict $3 : $4) }
| gtycon '{' fielddecls '}' {% mkRecCon $1 $3 }
| sbtype conop sbtype { ($2, InfixCon $1 $3) }
satypes :: { [RdrNameBangType] }
- : atype satypes { Unbanged $1 : $2 }
- | '!' atype satypes { Banged $2 : $3 }
+ : atype satypes { unbangedType $1 : $2 }
+ | '!' atype satypes { BangType MarkedUserStrict $2 : $3 }
| {- empty -} { [] }
sbtype :: { RdrNameBangType }
- : btype { Unbanged $1 }
- | '!' atype { Banged $2 }
+ : btype { unbangedType $1 }
+ | '!' atype { BangType MarkedUserStrict $2 }
fielddecls :: { [([RdrName],RdrNameBangType)] }
: fielddecl ',' fielddecls { $1 : $3 }
: sig_vars '::' stype { (reverse $1, $3) }
stype :: { RdrNameBangType }
- : ctype { Unbanged $1 }
- | '!' atype { Banged $2 }
+ : ctype { unbangedType $1 }
+ | '!' atype { BangType MarkedUserStrict $2 }
deriving :: { Maybe [RdrName] }
: {- empty -} { Nothing }
rhs :: { RdrNameGRHSs }
- : '=' srcloc exp wherebinds { (GRHSs (unguardedRHS $3 $2)
- $4 Nothing)}
- | gdrhs wherebinds { GRHSs (reverse $1) $2 Nothing }
+ : '=' srcloc exp wherebinds { (GRHSs (unguardedRHS $3 $2) $4 placeHolderType)}
+ | gdrhs wherebinds { GRHSs (reverse $1) $2 placeHolderType }
gdrhs :: { [RdrNameGRHS] }
: gdrhs gdrh { $2 : $1 }
| gdrh { [$1] }
gdrh :: { RdrNameGRHS }
- : '|' srcloc quals '=' exp { GRHS (reverse (ExprStmt $5 $2 : $3)) $2 }
+ : '|' srcloc quals '=' exp { GRHS (reverse (ResultStmt $5 $2 : $3)) $2 }
-----------------------------------------------------------------------------
-- Expressions
(panic "fixity") $3 )}
exp10 :: { RdrNameHsExpr }
- : '\\' aexp aexps opt_asig '->' srcloc exp
- {% checkPatterns ($2 : reverse $3) `thenP` \ ps ->
- returnP (HsLam (Match [] ps $4
- (GRHSs (unguardedRHS $7 $6)
- EmptyBinds Nothing))) }
+ : '\\' srcloc aexp aexps opt_asig '->' srcloc exp
+ {% checkPatterns $2 ($3 : reverse $4) `thenP` \ ps ->
+ returnP (HsLam (Match [] ps $5
+ (GRHSs (unguardedRHS $8 $7)
+ EmptyBinds placeHolderType))) }
| 'let' declbinds 'in' exp { HsLet $2 $4 }
| 'if' srcloc exp 'then' exp 'else' exp { HsIf $3 $5 $7 $2 }
| 'case' srcloc exp 'of' altslist { HsCase $3 $5 $2 }
| '-' fexp { mkHsNegApp $2 }
- | srcloc 'do' stmtlist { HsDo DoStmt $3 $1 }
+ | srcloc 'do' stmtlist {% checkDo $3 `thenP` \ stmts ->
+ returnP (HsDo DoExpr stmts $1) }
- | '_ccall_' ccallid aexps0 { HsCCall $2 $3 False False cbot }
- | '_ccall_GC_' ccallid aexps0 { HsCCall $2 $3 True False cbot }
- | '_casm_' CLITLIT aexps0 { HsCCall $2 $3 False True cbot }
- | '_casm_GC_' CLITLIT aexps0 { HsCCall $2 $3 True True cbot }
+ | '_ccall_' ccallid aexps0 { HsCCall $2 $3 PlayRisky False placeHolderType }
+ | '_ccall_GC_' ccallid aexps0 { HsCCall $2 $3 PlaySafe False placeHolderType }
+ | '_casm_' CLITLIT aexps0 { HsCCall $2 $3 PlayRisky True placeHolderType }
+ | '_casm_GC_' CLITLIT aexps0 { HsCCall $2 $3 PlaySafe True placeHolderType }
| scc_annot exp { if opt_SccProfilingOn
then HsSCC $1 $2
: ipvar { HsIPVar $1 }
| var_or_con { $1 }
| literal { HsLit $1 }
- | INTEGER { HsOverLit (HsIntegral $1 fromInteger_RDR) }
- | RATIONAL { HsOverLit (HsFractional $1 fromRational_RDR) }
+ | INTEGER { HsOverLit (HsIntegral $1) }
+ | RATIONAL { HsOverLit (HsFractional $1) }
| '(' exp ')' { HsPar $2 }
| '(' exp ',' texps ')' { ExplicitTuple ($2 : reverse $4) Boxed}
| '(#' texps '#)' { ExplicitTuple (reverse $2) Unboxed }
-- avoiding another shift/reduce-conflict.
list :: { RdrNameHsExpr }
- : exp { ExplicitList [$1] }
- | lexps { ExplicitList (reverse $1) }
+ : exp { ExplicitList placeHolderType [$1] }
+ | lexps { ExplicitList placeHolderType (reverse $1) }
| exp '..' { ArithSeqIn (From $1) }
| exp ',' exp '..' { ArithSeqIn (FromThen $1 $3) }
| exp '..' exp { ArithSeqIn (FromTo $1 $3) }
body qss = [ParStmt (map reverse qss)] }
in
returnP ( HsDo ListComp
- (reverse (ReturnStmt $1 : body $3))
+ (reverse (ResultStmt $1 $2 : body $3))
$2
)
}
| '|' quals { [$2] }
quals :: { [RdrNameStmt] }
- : quals ',' qual { $3 : $1 }
- | qual { [$1] }
-
-qual :: { RdrNameStmt }
- : srcloc infixexp '<-' exp {% checkPattern $2 `thenP` \p ->
- returnP (BindStmt p $4 $1) }
- | srcloc exp { GuardStmt $2 $1 }
- | srcloc 'let' declbinds { LetStmt $3 }
+ : quals ',' stmt { $3 : $1 }
+ | stmt { [$1] }
-----------------------------------------------------------------------------
-- Case alternatives
| alt { [$1] }
alt :: { RdrNameMatch }
- : infixexp opt_sig ralt wherebinds
- {% (checkPattern $1 `thenP` \p ->
- returnP (Match [] [p] $2
- (GRHSs $3 $4 Nothing)) )}
+ : srcloc infixexp opt_sig ralt wherebinds
+ {% (checkPattern $1 $2 `thenP` \p ->
+ returnP (Match [] [p] $3
+ (GRHSs $4 $5 placeHolderType)) )}
ralt :: { [RdrNameGRHS] }
- : '->' srcloc exp { [GRHS [ExprStmt $3 $2] $2] }
+ : '->' srcloc exp { [GRHS [ResultStmt $3 $2] $2] }
| gdpats { (reverse $1) }
gdpats :: { [RdrNameGRHS] }
| gdpat { [$1] }
gdpat :: { RdrNameGRHS }
- : srcloc '|' quals '->' exp { GRHS (reverse (ExprStmt $5 $1:$3)) $1}
+ : srcloc '|' quals '->' exp { GRHS (reverse (ResultStmt $5 $1:$3)) $1}
-----------------------------------------------------------------------------
-- Statement sequences
stmtlist :: { [RdrNameStmt] }
- : '{' stmts '}' { reverse $2 }
- | layout_on_for_do stmts close { reverse $2 }
-
--- Stmt list should really end in an expression, but it's not
--- convenient to enforce this here, so we throw out erroneous
--- statement sequences in the renamer instead.
-
+ : '{' stmts '}' { $2 }
+ | layout_on_for_do stmts close { $2 }
+
+-- do { ;; s ; s ; ; s ;; }
+-- The last Stmt should be a ResultStmt, but that's hard to enforce
+-- here, because we need too much lookahead if we see do { e ; }
+-- So we use ExprStmts throughout, and switch the last one over
+-- in ParseUtils.checkDo instead
stmts :: { [RdrNameStmt] }
- : ';' stmts1 { $2 }
- | stmts1 { $1 }
+ : stmt stmts_help { $1 : $2 }
+ | ';' stmts { $2 }
+ | {- empty -} { [] }
+
+stmts_help :: { [RdrNameStmt] }
+ : ';' stmts { $2 }
+ | {- empty -} { [] }
-stmts1 :: { [RdrNameStmt] }
- : stmts1 ';' stmt { $3 : $1 }
- | stmts1 ';' { $1 }
- | stmt { [$1] }
+-- For typing stmts at the GHCi prompt, where
+-- the input may consist of just comments.
+maybe_stmt :: { Maybe RdrNameStmt }
+ : stmt { Just $1 }
+ | {- nothing -} { Nothing }
stmt :: { RdrNameStmt }
- : srcloc infixexp '<-' exp {% checkPattern $2 `thenP` \p ->
+ : srcloc infixexp '<-' exp {% checkPattern $1 $2 `thenP` \p ->
returnP (BindStmt p $4 $1) }
- | srcloc exp { ExprStmt $2 $1 }
+ | srcloc exp { ExprStmt $2 placeHolderType $1 }
| srcloc 'let' declbinds { LetStmt $3 }
-----------------------------------------------------------------------------
-- *after* we see the close paren.
ipvar :: { RdrName }
- : IPVARID { (mkUnqual ipName (tailFS $1)) }
+ : IPVARID { (mkUnqual varName (tailFS $1)) }
qcon :: { RdrName }
: qconid { $1 }
| PRIMSTRING { HsStringPrim $1 }
| PRIMFLOAT { HsFloatPrim $1 }
| PRIMDOUBLE { HsDoublePrim $1 }
- | CLITLIT { HsLitLit $1 (error "Parser.y: CLITLIT") }
+ | CLITLIT { HsLitLit $1 placeHolderType }
srcloc :: { SrcLoc } : {% getSrcLocP }
modid :: { ModuleName }
: CONID { mkModuleNameFS $1 }
+ | QCONID { mkModuleNameFS
+ (mkFastString
+ (unpackFS (fst $1) ++
+ '.':unpackFS (snd $1)))
+ }
tycon :: { RdrName }
: CONID { mkUnqual tcClsName $1 }
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