static maybe module_exports;
extern list Lnil;
+extern list reverse_list();
extern tree root;
/* For FN, PREVPATT and SAMEFN macros */
char *ineg PROTO((char *));
long source_version = 0;
+BOOLEAN pat_check=TRUE;
-BOOLEAN inpat;
%}
%union {
* *
**********************************************************************/
-%token OCURLY CCURLY VCCURLY SEMI
-%token OBRACK CBRACK OPAREN CPAREN
-%token COMMA BQUOTE
+%token OCURLY CCURLY VCCURLY
+%token COMMA SEMI OBRACK CBRACK
+%token WILDCARD BQUOTE OPAREN CPAREN
+%token OUNBOXPAREN CUNBOXPAREN
/**********************************************************************
* *
**********************************************************************/
-%token DOTDOT DCOLON EQUAL
-%token LAMBDA VBAR RARROW
-%token LARROW MINUS
+%token DOTDOT DCOLON EQUAL LAMBDA
+%token VBAR RARROW LARROW
+%token AT LAZY DARROW
/**********************************************************************
%token SCC
%token CCALL CCALL_GC CASM CASM_GC
+%token DOT FORALL
+%token EXPORT UNSAFE STDCALL C_CALL LABEL
+%token PASCAL FASTCALL FOREIGN DYNAMIC
/**********************************************************************
* *
* *
-* Valid symbols/identifiers which need to be recognised *
+* Special symbols/identifiers which need to be recognised *
* *
* *
**********************************************************************/
-%token WILDCARD AT LAZY BANG
+%token MINUS BANG PLUS
%token AS HIDING QUALIFIED
**********************************************************************/
%token INTERFACE_UPRAGMA SPECIALISE_UPRAGMA
-%token INLINE_UPRAGMA MAGIC_UNFOLDING_UPRAGMA
-%token DEFOREST_UPRAGMA END_UPRAGMA
+%token INLINE_UPRAGMA NOINLINE_UPRAGMA MAGIC_UNFOLDING_UPRAGMA
+%token END_UPRAGMA
+%token SOURCE_UPRAGMA
/**********************************************************************
* *
SCC CASM CCALL CASM_GC CCALL_GC
%left VARSYM CONSYM QVARSYM QCONSYM
- MINUS BQUOTE BANG DARROW
+ MINUS BQUOTE BANG DARROW PLUS
%left DCOLON
%type <ulist> caserest alts alt quals
dorest stmts stmt
- rbinds rpats list_exps
+ rbinds rbinds1 rpats rpats1 list_exps list_rest
qvarsk qvars_list
- constrs constr1 fields
- types atypes batypes
+ constrs constr1 fields conargatypes
+ tautypes atypes
types_and_maybe_ids
- pats context context_list tyvar_list
+ pats simple_context simple_context_list
export_list enames
import_list inames
impdecls maybeimpdecls impdecl
maybefixes fixes fix ops
dtyclses dtycls_list
gdrhs gdpat valrhs
- lampats cexps
+ lampats cexps gd texps
+ tyvars1 constr_context forall
-%type <umaybe> maybeexports impas maybeimpspec deriving
-
-%type <ueither> impspec
+%type <umaybe> maybeexports impspec deriving
+ ext_name
%type <uliteral> lit_constant
-%type <utree> exp oexp dexp kexp fexp aexp rbind texps
+%type <utree> exp oexp dexp kexp fexp aexp rbind
expL oexpL kexpL expLno oexpLno dexpLno kexpLno
- vallhs funlhs qual gd leftexp
- pat bpat apat apatc conpat rpat
- patk bpatk apatck conpatk
+ vallhs funlhs qual leftexp
+ pat cpat bpat apat apatc conpat rpat
+ patk bpatk apatck conpatk
-%type <uid> MINUS DARROW AS LAZY
+%type <uid> MINUS PLUS DARROW AS LAZY
VARID CONID VARSYM CONSYM
var con varop conop op
vark varid varsym varsym_nominus
- tycon modid impmod ccallid
+ tycon modid ccallid tyvar
+ varid_noforall
%type <uqid> QVARID QCONID QVARSYM QCONSYM
qvarid qconid qvarsym qconsym
qvar qcon qvarop qconop qop
qvark qconk qtycon qtycls
- gcon gconk gtycon qop1 qvarop1
- ename iname
+ gcon gconk gtycon itycon qop1 qvarop1
+ ename iname
%type <ubinding> topdecl topdecls letdecls
- typed datad newtd classd instd defaultd
+ typed datad newtd classd instd defaultd foreignd
decl decls valdef instdef instdefs
maybe_where cbody rinst type_and_maybe_id
%type <upbinding> valrhs1 altrest
-%type <uttype> simple ctype type atype btype
- gtyconapp ntyconapp ntycon gtyconvars
- bbtype batype btyconapp
- class restrict_inst general_inst tyvar
+%type <uttype> polytype
+ conargatype conapptype
+ tautype
+ apptype
+ atype polyatype
+ simple_con_app simple_con_app1 inst_type
-%type <uconstr> constr field
+%type <uconstr> constr constr_after_context field
%type <ustring> FLOAT INTEGER INTPRIM
FLOATPRIM DOUBLEPRIM CLITLIT
%type <uentid> export import
-%type <ulong> commas impqual
+%type <ulong> commas importkey get_line_no
+ unsafe_flag callconv
/**********************************************************************
* *
;
-impdecl : importkey impqual impmod impas maybeimpspec
- {
- $$ = lsing(mkimport($3,$2,$4,$5,startlineno));
- }
- ;
-
-impmod : modid { $$ = $1; }
- ;
-
-impqual : /* noqual */ { $$ = 0; }
- | QUALIFIED { $$ = 1; }
- ;
-
-impas : /* noas */ { $$ = mknothing(); }
- | AS modid { $$ = mkjust($2); }
+impdecl : importkey modid impspec
+ { $$ = lsing(mkimport($2,0,mknothing(),$3,$1,startlineno)); }
+ | importkey QUALIFIED modid impspec
+ { $$ = lsing(mkimport($3,1,mknothing(),$4,$1,startlineno)); }
+ | importkey QUALIFIED modid AS modid impspec
+ { $$ = lsing(mkimport($3,1,mkjust($5),$6,$1,startlineno)); }
+ | importkey modid AS modid impspec
+ { $$ = lsing(mkimport($3,1,mkjust($4),$5,$1,startlineno)); }
;
-maybeimpspec : /* empty */ { $$ = mknothing(); }
- | impspec { $$ = mkjust($1); }
- ;
-
-impspec : OPAREN CPAREN { $$ = mkleft(Lnil); }
- | OPAREN import_list CPAREN { $$ = mkleft($2); }
- | OPAREN import_list COMMA CPAREN { $$ = mkleft($2); }
- | HIDING OPAREN import_list CPAREN { $$ = mkright($3); }
- | HIDING OPAREN import_list COMMA CPAREN { $$ = mkright($3); }
+impspec : /* empty */ { $$ = mknothing(); }
+ | OPAREN CPAREN { $$ = mkjust(mkleft(Lnil)); }
+ | OPAREN import_list CPAREN { $$ = mkjust(mkleft($2)); }
+ | OPAREN import_list COMMA CPAREN { $$ = mkjust(mkleft($2)); }
+ | HIDING OPAREN import_list CPAREN { $$ = mkjust(mkright($3)); }
+ | HIDING OPAREN import_list COMMA CPAREN { $$ = mkjust(mkright($3)); }
;
import_list:
;
import : var { $$ = mkentid(mknoqual($1)); }
- | tycon { $$ = mkenttype(mknoqual($1)); }
- | tycon OPAREN DOTDOT CPAREN { $$ = mkenttypeall(mknoqual($1)); }
- | tycon OPAREN CPAREN { $$ = mkenttypenamed(mknoqual($1),Lnil); }
- | tycon OPAREN inames CPAREN { $$ = mkenttypenamed(mknoqual($1),$3); }
+ | itycon { $$ = mkenttype($1); }
+ | itycon OPAREN DOTDOT CPAREN { $$ = mkenttypeall($1); }
+ | itycon OPAREN CPAREN { $$ = mkenttypenamed($1,Lnil);}
+ | itycon OPAREN inames CPAREN { $$ = mkenttypenamed($1,$3); }
+ ;
+
+itycon : tycon { $$ = mknoqual($1); }
+ | OBRACK CBRACK { $$ = creategid(NILGID); }
+ | OPAREN CPAREN { $$ = creategid(UNITGID); }
+ | OPAREN commas CPAREN { $$ = creategid($2); }
;
inames : iname { $$ = lsing($1); }
ops { $$ = $3; }
;
-ops : op { $$ = lsing(mkfixop(mknoqual($1),infixint(Fixity),Precedence)); }
- | ops COMMA op { $$ = lapp($1,mkfixop(mknoqual($3),infixint(Fixity),Precedence)); }
+ops : op { $$ = lsing(mkfixop(mknoqual($1),infixint(Fixity),Precedence,startlineno)); }
+ | ops COMMA op { $$ = lapp($1,mkfixop(mknoqual($3),infixint(Fixity),Precedence,startlineno)); }
;
topdecls: topdecl
}
;
-topdecl : typed { $$ = $1; }
- | datad { $$ = $1; }
- | newtd { $$ = $1; }
- | classd { $$ = $1; }
- | instd { $$ = $1; }
- | defaultd { $$ = $1; }
+topdecl : typed { $$ = $1; FN = NULL; SAMEFN = 0; }
+ | datad { $$ = $1; FN = NULL; SAMEFN = 0; }
+ | newtd { $$ = $1; FN = NULL; SAMEFN = 0; }
+ | classd { $$ = $1; FN = NULL; SAMEFN = 0; }
+ | instd { $$ = $1; FN = NULL; SAMEFN = 0; }
+ | defaultd { $$ = $1; FN = NULL; SAMEFN = 0; }
+ | foreignd { $$ = $1; FN = NULL; SAMEFN = 0; }
| decl { $$ = $1; }
;
-typed : typekey simple EQUAL type { $$ = mknbind($2,$4,startlineno); }
+typed : typekey simple_con_app EQUAL tautype { $$ = mknbind($2,$4,startlineno); }
;
-datad : datakey simple EQUAL constrs deriving
+datad : datakey simple_con_app EQUAL constrs deriving
{ $$ = mktbind(Lnil,$2,$4,$5,startlineno); }
- | datakey context DARROW simple EQUAL constrs deriving
+ | datakey simple_context DARROW simple_con_app EQUAL constrs deriving
{ $$ = mktbind($2,$4,$6,$7,startlineno); }
;
-newtd : newtypekey simple EQUAL constr1 deriving
+newtd : newtypekey simple_con_app EQUAL constr1 deriving
{ $$ = mkntbind(Lnil,$2,$4,$5,startlineno); }
- | newtypekey context DARROW simple EQUAL constr1 deriving
+ | newtypekey simple_context DARROW simple_con_app EQUAL constr1 deriving
{ $$ = mkntbind($2,$4,$6,$7,startlineno); }
;
| DERIVING dtyclses { $$ = mkjust($2); }
;
-classd : classkey context DARROW class cbody
- { $$ = mkcbind($2,$4,$5,startlineno); }
- | classkey class cbody
- { $$ = mkcbind(Lnil,$2,$3,startlineno); }
+classd : classkey apptype DARROW simple_con_app1 cbody
+ /* Context can now be more than simple_context */
+ { $$ = mkcbind(type2context($2),$4,$5,startlineno); }
+ | classkey apptype cbody
+ /* We have to say apptype rather than simple_con_app1, else
+ we get reduce/reduce errs */
+ { check_class_decl_head($2);
+ $$ = mkcbind(Lnil,$2,$3,startlineno); }
;
cbody : /* empty */ { $$ = mknullbind(); }
| WHERE vocurly decls vccurly { checkorder($3); $$ = $3; }
;
-instd : instkey context DARROW gtycon restrict_inst rinst
- { $$ = mkibind($2,$4,$5,$6,startlineno); }
- | instkey gtycon general_inst rinst
- { $$ = mkibind(Lnil,$2,$3,$4,startlineno); }
+instd : instkey inst_type rinst { $$ = mkibind($2,$3,startlineno); }
;
+/* Compare polytype */
+/* [July 98: first production was tautype DARROW tautype, but I can't see why.] */
+inst_type : apptype DARROW apptype { is_context_format( $3, 0 ); /* Check the instance head */
+ $$ = mkforall(Lnil,type2context($1),$3); }
+ | apptype { is_context_format( $1, 0 ); /* Check the instance head */
+ $$ = $1; }
+ ;
+
+
rinst : /* empty */ { $$ = mknullbind(); }
| WHERE ocurly instdefs ccurly { $$ = $3; }
| WHERE vocurly instdefs vccurly { $$ = $3; }
;
-restrict_inst : gtycon { $$ = mktname($1); }
- | OPAREN gtyconvars CPAREN { $$ = $2; }
- | OPAREN tyvar COMMA tyvar_list CPAREN { $$ = mkttuple(mklcons($2,$4)); }
- | OBRACK tyvar CBRACK { $$ = mktllist($2); }
- | OPAREN tyvar RARROW tyvar CPAREN { $$ = mktfun($2,$4); }
+defaultd: defaultkey OPAREN tautypes CPAREN { $$ = mkdbind($3,startlineno); }
+ | defaultkey OPAREN CPAREN { $$ = mkdbind(Lnil,startlineno); }
;
-general_inst : gtycon { $$ = mktname($1); }
- | OPAREN gtyconapp CPAREN { $$ = $2; }
- | OPAREN type COMMA types CPAREN { $$ = mkttuple(mklcons($2,$4)); }
- | OBRACK type CBRACK { $$ = mktllist($2); }
- | OPAREN btype RARROW type CPAREN { $$ = mktfun($2,$4); }
+/* FFI primitive declarations - GHC/Hugs specific */
+foreignd: foreignkey IMPORT callconv ext_name unsafe_flag qvarid DCOLON tautype { $$ = mkfobind($6,$8,$4,$5,$3,FOREIGN_IMPORT,startlineno); }
+ | foreignkey EXPORT callconv ext_name qvarid DCOLON tautype { $$ = mkfobind($5,$7,$4,0,$3,FOREIGN_EXPORT,startlineno); }
+ ;
+ | foreignkey LABEL ext_name qvarid DCOLON tautype { $$ = mkfobind($4,$6,$3,0,-1,FOREIGN_LABEL,startlineno); }
;
-defaultd: defaultkey OPAREN types CPAREN { $$ = mkdbind($3,startlineno); }
- | defaultkey OPAREN CPAREN { $$ = mkdbind(Lnil,startlineno); }
+callconv: STDCALL { $$ = CALLCONV_STDCALL; }
+ | C_CALL { $$ = CALLCONV_CCALL; }
+ | PASCAL { $$ = CALLCONV_PASCAL; }
+ | FASTCALL { $$ = CALLCONV_FASTCALL; }
+/* If you leave out the specification of a calling convention, you'll (probably) get C's. */
+ | /*empty*/ { $$ = CALLCONV_NONE; }
;
+ext_name: STRING { $$ = mkjust(lsing($1)); }
+ | STRING STRING { $$ = mkjust(mklcons ($1,lsing($2))); }
+ | DYNAMIC { $$ = mknothing(); }
+
+unsafe_flag: UNSAFE { $$ = 1; }
+ | /*empty*/ { $$ = 0; }
+ ;
+
+
+
decls : decl
| decls SEMI decl
{
to real mischief (ugly, but likely to work).
*/
-decl : qvarsk DCOLON ctype
+decl : qvarsk DCOLON polytype
{ $$ = mksbind($1,$3,startlineno);
PREVPATT = NULL; FN = NULL; SAMEFN = 0;
}
PREVPATT = NULL; FN = NULL; SAMEFN = 0;
}
- | SPECIALISE_UPRAGMA INSTANCE gtycon general_inst END_UPRAGMA
+ | SPECIALISE_UPRAGMA INSTANCE gtycon atype END_UPRAGMA
{
$$ = mkispec_uprag($3, $4, startlineno);
PREVPATT = NULL; FN = NULL; SAMEFN = 0;
PREVPATT = NULL; FN = NULL; SAMEFN = 0;
}
- | MAGIC_UNFOLDING_UPRAGMA qvark vark END_UPRAGMA
+ | NOINLINE_UPRAGMA qvark END_UPRAGMA
{
- $$ = mkmagicuf_uprag($2, $3, startlineno);
+ $$ = mknoinline_uprag($2, startlineno);
PREVPATT = NULL; FN = NULL; SAMEFN = 0;
}
- | DEFOREST_UPRAGMA qvark END_UPRAGMA
- {
- $$ = mkdeforest_uprag($2, startlineno);
- PREVPATT = NULL; FN = NULL; SAMEFN = 0;
+ | MAGIC_UNFOLDING_UPRAGMA qvark vark END_UPRAGMA
+ {
+ $$ = mkmagicuf_uprag($2, $3, startlineno);
+ PREVPATT = NULL; FN = NULL; SAMEFN = 0;
}
/* end of user-specified pragmas */
;
type_and_maybe_id :
- type { $$ = mkvspec_ty_and_id($1,mknothing()); }
- | type EQUAL qvark { $$ = mkvspec_ty_and_id($1,mkjust($3)); }
+ tautype { $$ = mkvspec_ty_and_id($1,mknothing()); }
+ | tautype EQUAL qvark { $$ = mkvspec_ty_and_id($1,mkjust($3)); }
/**********************************************************************
* *
**********************************************************************/
-/* "DCOLON context => type" vs "DCOLON type" is a problem,
+/* "DCOLON context => tautype" vs "DCOLON tautype" is a problem,
because you can't distinguish between
foo :: (Baz a, Baz a)
bar :: (Baz a, Baz a) => [a] -> [a] -> [a]
- with one token of lookahead. The HACK is to have "DCOLON ttype"
- [tuple type] in the first case, then check that it has the right
+ with one token of lookahead. The HACK is to have "DCOLON apptype"
+ in the first case, then check that it has the right
form C a, or (C1 a, C2 b, ... Cn z) and convert it into a
context. Blaach!
*/
- /* 1 S/R conflict at DARROW -> shift */
-ctype : type DARROW type { $$ = mkcontext(type2context($1),$3); }
- | type
- ;
+/* --------------------------- */
- /* 1 S/R conflict at RARROW -> shift */
-type : btype { $$ = $1; }
- | btype RARROW type { $$ = mktfun($1,$3); }
- ;
+polyatype : atype
+ ;
-/* btype is split so we can parse gtyconapp without S/R conflicts */
-btype : gtyconapp { $$ = $1; }
- | ntyconapp { $$ = $1; }
- ;
+polytype : FORALL tyvars1 DOT
+ apptype DARROW tautype { $$ = mkforall($2, type2context($4), $6); }
+ | FORALL tyvars1 DOT tautype { $$ = mkforall($2, Lnil, $4); }
+ | apptype DARROW tautype { $$ = mkforall(Lnil, type2context($1), $3); }
+ | tautype
+ ;
-ntyconapp: ntycon { $$ = $1; }
- | ntyconapp atype { $$ = mktapp($1,$2); }
- ;
+/* --------------------------- */
+/* tautype is just a monomorphic type.
+ But it may have nested for-alls if we're in a rank-2 type */
-gtyconapp: gtycon { $$ = mktname($1); }
- | gtyconapp atype { $$ = mktapp($1,$2); }
+tautype : apptype RARROW tautype { $$ = mktfun($1,$3); }
+ | apptype { $$ = $1; }
;
+tautypes : tautype { $$ = lsing($1); }
+ | tautypes COMMA tautype { $$ = lapp($1,$3); }
+ ;
-atype : gtycon { $$ = mktname($1); }
- | ntycon { $$ = $1; }
+/* --------------------------- */
+/* apptype: type application */
+
+apptype : apptype atype { $$ = mktapp($1,$2); }
+ | atype { $$ = $1; }
;
-ntycon : tyvar { $$ = $1; }
- | OPAREN type COMMA types CPAREN { $$ = mkttuple(mklcons($2,$4)); }
- | OBRACK type CBRACK { $$ = mktllist($2); }
- | OPAREN type CPAREN { $$ = $2; }
- ;
+/* --------------------------- */
+/* atype: an atomic or bracketed type: T, x, [ty], tuple ty */
-gtycon : qtycon
- | OPAREN RARROW CPAREN { $$ = creategid(-2); }
- | OBRACK CBRACK { $$ = creategid(-1); }
- | OPAREN CPAREN { $$ = creategid(0); }
- | OPAREN commas CPAREN { $$ = creategid($2); }
- ;
+atypes : atype { $$ = lsing($1); }
+ | atype atypes { $$ = mklcons($1,$2); }
+ ;
+
+atype : gtycon { $$ = mktname($1); }
+ | tyvar { $$ = mknamedtvar($1); }
-atypes : atype { $$ = lsing($1); }
- | atypes atype { $$ = lapp($1,$2); }
+ | OPAREN tautype COMMA
+ tautypes CPAREN { $$ = mkttuple(mklcons($2,$4)); }
+
+ | OUNBOXPAREN tautype COMMA
+ tautypes CUNBOXPAREN { $$ = mktutuple(mklcons($2,$4)); }
+
+ | OBRACK tautype CBRACK { $$ = mktllist($2); }
+ | OPAREN polytype CPAREN { $$ = $2; }
;
-types : type { $$ = lsing($1); }
- | types COMMA type { $$ = lapp($1,$3); }
+/* --------------------------- */
+gtycon : qtycon
+ | OPAREN RARROW CPAREN { $$ = creategid(ARROWGID); }
+ | OBRACK CBRACK { $$ = creategid(NILGID); }
+ | OPAREN CPAREN { $$ = creategid(UNITGID); }
+ | OPAREN commas CPAREN { $$ = creategid($2); }
;
commas : COMMA { $$ = 1; }
* *
**********************************************************************/
-simple : gtycon { $$ = mktname($1); }
- | gtyconvars { $$ = $1; }
+/* C a b c, where a,b,c are type variables */
+/* C can be a class or tycon */
+simple_con_app: gtycon { $$ = mktname($1); }
+ | simple_con_app1 { $$ = $1; }
+ ;
+
+simple_con_app1: gtycon tyvar { $$ = mktapp(mktname($1),mknamedtvar($2)); }
+ | simple_con_app tyvar { $$ = mktapp($1, mknamedtvar($2)); }
;
-gtyconvars: gtycon tyvar { $$ = mktapp(mktname($1),$2); }
- | gtyconvars tyvar { $$ = mktapp($1,$2); }
+simple_context : OPAREN simple_context_list CPAREN { $$ = $2; }
+ | simple_con_app1 { $$ = lsing($1); }
;
-context : OPAREN context_list CPAREN { $$ = $2; }
- | class { $$ = lsing($1); }
+simple_context_list: simple_con_app1 { $$ = lsing($1); }
+ | simple_context_list COMMA simple_con_app1 { $$ = lapp($1,$3); }
;
-context_list: class { $$ = lsing($1); }
- | context_list COMMA class { $$ = lapp($1,$3); }
+constrs : constr { $$ = lsing($1); }
+ | constrs VBAR constr { $$ = lapp($1,$3); }
;
-class : gtycon tyvar { $$ = mktapp(mktname($1),$2); }
+constr : forall constr_context DARROW constr_after_context { $$ = mkconstrex ( $1, $2, $4 ); }
+ | forall constr_after_context { $$ = mkconstrex ( $1, Lnil, $2 ); }
;
-constrs : constr { $$ = lsing($1); }
- | constrs VBAR constr { $$ = lapp($1,$3); }
+forall : { $$ = Lnil }
+ | FORALL tyvars1 DOT { $$ = $2; }
+ ;
+
+constr_context
+ : conapptype conargatype { $$ = type2context( mktapp($1,$2) ); }
+ | conargatype { $$ = type2context( $1 ); }
;
-constr : btyconapp { qid tyc; list tys;
+constr_after_context :
+
+ /* We have to parse the constructor application as a *type*, else we get
+ into terrible ambiguity problems. Consider the difference between
+
+ data T = S Int Int Int `R` Int
+ and
+ data T = S Int Int Int
+
+ It isn't till we get to the operator that we discover that the "S" is
+ part of a type in the first, but part of a constructor application in the
+ second.
+ */
+
+/* Con !Int (Tree a) */
+ conapptype { qid tyc; list tys;
splittyconapp($1, &tyc, &tys);
$$ = mkconstrpre(tyc,tys,hsplineno); }
- | OPAREN qconsym CPAREN { $$ = mkconstrpre($2,Lnil,hsplineno); }
- | OPAREN qconsym CPAREN batypes { $$ = mkconstrpre($2,$4,hsplineno); }
- | btyconapp qconop bbtype { checknobangs($1);
- $$ = mkconstrinf($1,$2,$3,hsplineno); }
- | ntyconapp qconop bbtype { $$ = mkconstrinf($1,$2,$3,hsplineno); }
- | BANG atype qconop bbtype { $$ = mkconstrinf(mktbang($2),$3,$4,hsplineno); }
- /* 1 S/R conflict on OCURLY -> shift */
- | gtycon OCURLY fields CCURLY { $$ = mkconstrrec($1,$3,hsplineno); }
- ;
+/* (::) (Tree a) Int */
+ | OPAREN qconsym CPAREN conargatypes { $$ = mkconstrpre($2,$4,hsplineno); }
-btyconapp: gtycon { $$ = mktname($1); }
- | btyconapp batype { $$ = mktapp($1,$2); }
- ;
+/* !Int `Con` Tree a */
+ | conargatype qconop conargatype { $$ = mkconstrinf($1,$2,$3,hsplineno); }
-bbtype : btype { $$ = $1; }
- | BANG atype { $$ = mktbang($2); }
+/* Con { op1 :: Int } */
+ | qtycon OCURLY fields CCURLY { $$ = mkconstrrec($1,$3,hsplineno); }
+ | OPAREN qconsym CPAREN OCURLY fields CCURLY { $$ = mkconstrrec($2,$5,hsplineno); }
;
+ /* 1 S/R conflict on OCURLY -> shift */
-batype : atype { $$ = $1; }
- | BANG atype { $$ = mktbang($2); }
- ;
-batypes : batype { $$ = lsing($1); }
- | batypes batype { $$ = lapp($1,$2); }
- ;
+conapptype : gtycon { $$ = mktname($1); }
+ | conapptype conargatype { $$ = mktapp($1, $2); }
+ ;
+conargatype : polyatype { $$ = $1; }
+ | BANG polyatype { $$ = mktbang( $2 ); }
+ ;
+
+conargatypes : { $$ = Lnil; }
+ | conargatype conargatypes { $$ = mklcons($1,$2); }
+ ;
fields : field { $$ = lsing($1); }
| fields COMMA field { $$ = lapp($1,$3); }
;
-field : qvars_list DCOLON type { $$ = mkfield($1,$3); }
- | qvars_list DCOLON BANG atype { $$ = mkfield($1,mktbang($4)); }
+field : qvars_list DCOLON polytype { $$ = mkfield($1,$3); }
+ | qvars_list DCOLON BANG polyatype { $$ = mkfield($1,mktbang($4)); }
;
-constr1 : gtycon atype { $$ = lsing(mkconstrnew($1,$2,hsplineno)); }
+constr1 : gtycon conargatype { $$ = lsing(mkconstrnew($1,$2,hsplineno)); }
;
PREVPATT = NULL; FN = NULL; SAMEFN = 0;
}
+ | NOINLINE_UPRAGMA qvark END_UPRAGMA
+ {
+ $$ = mknoinline_uprag($2, startlineno);
+ PREVPATT = NULL; FN = NULL; SAMEFN = 0;
+ }
+
| MAGIC_UNFOLDING_UPRAGMA qvark vark END_UPRAGMA
{
$$ = mkmagicuf_uprag($2, $3, startlineno);
valdef : vallhs
+
{
tree fn = function($1);
PREVPATT = $1;
#else
fprintf(stderr,"%u\tvaldef\n",startlineno);
#endif
- }
+ }
+
+ get_line_no
valrhs
{
if ( lhs_is_patt($1) )
{
- $$ = mkpbind($3, startlineno);
+ $$ = mkpbind($4, $3);
FN = NULL;
SAMEFN = 0;
}
else
- $$ = mkfbind($3,startlineno);
+ $$ = mkfbind($4, $3);
PREVPATT = NULL;
}
;
+get_line_no : { $$ = startlineno; }
+ ;
+
vallhs : patk { $$ = $1; }
| patk qvarop pat { $$ = mkinfixap($2,$1,$3); }
| funlhs { $$ = $1; }
maybe_where:
WHERE ocurly decls ccurly { $$ = $3; }
| WHERE vocurly decls vccurly { $$ = $3; }
+ /* A where containing no decls is OK */
+ | WHERE SEMI { $$ = mknullbind(); }
| /* empty */ { $$ = mknullbind(); }
;
-gd : VBAR oexp { $$ = $2; }
+gd : VBAR quals { $$ = $2; }
;
* *
**********************************************************************/
-exp : oexp DCOLON ctype { $$ = mkrestr($1,$3); }
+exp : oexp DCOLON polytype { $$ = mkrestr($1,$3); }
| oexp
;
Operators must be left-associative at the same precedence for
precedence parsing to work.
*/
- /* 9 S/R conflicts on qop -> shift */
+ /* 8 S/R conflicts on qop -> shift */
oexp : oexp qop oexp %prec MINUS { $$ = mkinfixap($2,$1,$3); }
| dexp
;
/*
We need to factor out a leading let expression so we can set
- inpat=TRUE when parsing (non let) expressions inside stmts and quals
+ pat_check=FALSE when parsing (non let) expressions inside stmts and quals
*/
-expLno : oexpLno DCOLON ctype { $$ = mkrestr($1,$3); }
- | oexpLno
+expLno : oexpLno DCOLON polytype { $$ = mkrestr($1,$3); }
+ | oexpLno
;
oexpLno : oexpLno qop oexp %prec MINUS { $$ = mkinfixap($2,$1,$3); }
| dexpLno
| kexpLno
;
-expL : oexpL DCOLON ctype { $$ = mkrestr($1,$3); }
+expL : oexpL DCOLON polytype { $$ = mkrestr($1,$3); }
| oexpL
;
oexpL : oexpL qop oexp %prec MINUS { $$ = mkinfixap($2,$1,$3); }
| kexpLno
;
+/* kexpL = a let expression */
kexpL : letdecls IN exp { $$ = mklet($1,$3); }
;
+/* kexpLno = any other expression more tightly binding than operator application */
kexpLno : LAMBDA
{ hsincindent(); /* push new context for FN = NULL; */
FN = NULL; /* not actually concerned about indenting */
/* SCC Expression */
| SCC STRING exp
{ if (ignoreSCC) {
- $$ = $3;
+ if (warnSCC) {
+ fprintf(stderr,
+ "\"%s\":%d: _scc_ (`set [profiling] cost centre') ignored\n",
+ input_filename, hsplineno);
+ }
+ $$ = mkpar($3); /* Note the mkpar(). If we don't have it, then
+ (x >> _scc_ y >> z) parses as (x >> (y >> z)),
+ right associated. But the precedence reorganiser expects
+ the parser to *left* associate all operators unless there
+ are explicit parens. The _scc_ acts like an explicit paren,
+ so if we omit it we'd better add explicit parens instead. */
} else {
$$ = mkscc($2, $3);
}
| gcon { $$ = mkident($1); }
| lit_constant { $$ = mklit($1); }
| OPAREN exp CPAREN { $$ = mkpar($2); } /* mkpar: stop infix parsing at ()'s */
- | qcon OCURLY CCURLY { $$ = mkrecord($1,Lnil); }
| qcon OCURLY rbinds CCURLY { $$ = mkrecord($1,$3); } /* 1 S/R conflict on OCURLY -> shift */
| OBRACK list_exps CBRACK { $$ = mkllist($2); }
- | OPAREN exp COMMA texps CPAREN { if (ttree($4) == tuple)
- $$ = mktuple(mklcons($2, gtuplelist((struct Stuple *) $4)));
- else
- $$ = mktuple(ldub($2, $4)); }
+ | OPAREN exp COMMA texps CPAREN { $$ = mktuple(mklcons($2,$4)); }
+ /* unboxed tuples */
+ | OUNBOXPAREN exp COMMA texps CUNBOXPAREN
+ { $$ = mkutuple(mklcons($2,$4)); }
/* only in expressions ... */
- | aexp OCURLY rbinds CCURLY { $$ = mkrupdate($1,$3); }
+ | aexp OCURLY rbinds1 CCURLY { $$ = mkrupdate($1,$3); }
| OBRACK exp VBAR quals CBRACK { $$ = mkcomprh($2,$4); }
| OBRACK exp COMMA exp DOTDOT exp CBRACK {$$= mkeenum($2,mkjust($4),mkjust($6)); }
| OBRACK exp COMMA exp DOTDOT CBRACK { $$ = mkeenum($2,mkjust($4),mknothing()); }
caserest: ocurly alts ccurly { $$ = $2; }
| vocurly alts vccurly { $$ = $2; }
-dorest : ocurly stmts ccurly { checkdostmts($2); $$ = $2; }
+dorest : ocurly stmts ccurly { checkdostmts($2); $$ = $2; }
| vocurly stmts vccurly { checkdostmts($2); $$ = $2; }
;
-rbinds : rbind { $$ = lsing($1); }
- | rbinds COMMA rbind { $$ = lapp($1,$3); }
+rbinds : /* empty */ { $$ = Lnil; }
+ | rbinds1
+ ;
+
+rbinds1 : rbind { $$ = lsing($1); }
+ | rbinds1 COMMA rbind { $$ = lapp($1,$3); }
;
rbind : qvar { $$ = mkrbind($1,mknothing()); }
| qvar EQUAL exp { $$ = mkrbind($1,mkjust($3)); }
- ;
+;
-texps : exp { $$ = mkpar($1); } /* mkpar: so we don't flatten last element in tuple */
- | exp COMMA texps
- { if (ttree($3) == tuple)
- $$ = mktuple(mklcons($1, gtuplelist((struct Stuple *) $3)));
- else if (ttree($3) == par)
- $$ = mktuple(ldub($1, gpare((struct Spar *) $3)));
- else
- hsperror("hsparser:texps: panic");
- }
+texps : exp { $$ = lsing($1); }
+ | exp COMMA texps { $$ = mklcons($1, $3) }
/* right recursion? WDP */
;
-
list_exps :
exp { $$ = lsing($1); }
+ | exp COMMA exp { $$ = mklcons( $1, lsing($3) ); }
+ | exp COMMA exp COMMA list_rest { $$ = mklcons( $1, mklcons( $3, reverse_list( $5 ))); }
+ ;
+
+/* Use left recusion for list_rest, because we sometimes get programs with
+ very long explicit lists. */
+list_rest : exp { $$ = lsing($1); }
+ | list_rest COMMA exp { $$ = mklcons( $3, $1 ); }
+ ;
+
+/*
+ exp { $$ = lsing($1); }
| exp COMMA list_exps { $$ = mklcons($1, $3); }
+*/
/* right recursion? (WDP)
It has to be this way, though, otherwise you
(In fact, if you change the grammar and throw yacc/bison
at it, it *will* do the wrong thing [WDP 94/06])
*/
- ;
-letdecls: LET ocurly decls ccurly { $$ = $3 }
- | LET vocurly decls vccurly { $$ = $3 }
+letdecls: LET { pat_check = TRUE; } ocurly decls ccurly { $$ = $4; }
+ | LET { pat_check = TRUE; } vocurly decls vccurly { $$ = $4; }
;
-quals : qual { $$ = lsing($1); }
- | quals COMMA qual { $$ = lapp($1,$3); }
+/*
+ When parsing patterns inside do stmt blocks or quals, we have
+ to tentatively parse them as expressions, since we don't know at
+ the time of parsing `p' whether it will be part of "p <- e" (pat)
+ or "p" (expr). When we eventually can tell the difference, the parse
+ of `p' is examined to see if it consitutes a syntactically legal pattern
+ or expression.
+
+ The expr rule used to parse the pattern/expression do contain
+ pattern-special productions (e.g., _ , a@pat, etc.), which are
+ illegal in expressions. Since we don't know whether what
+ we're parsing is an expression rather than a pattern, we turn off
+ the check and instead do it later.
+
+ The rather clumsy way that this check is turned on/off is there
+ to work around a Bison feature/shortcoming. Turning the flag
+ on/off just around the relevant nonterminal by decorating it
+ with simple semantic actions, e.g.,
+
+ {pat_check = FALSE; } expLNo { pat_check = TRUE; }
+
+ causes Bison to generate a parser where in one state it either
+ has to reduce/perform a semantic action ( { pat_check = FALSE; })
+ or reduce an error (the error production used to implement
+ vccurly.) Bison picks the semantic action, which it ideally shouldn't.
+ The work around is to lift out the setting of { pat_check = FALSE; }
+ and then later reset pat_check. Not pretty.
+
+*/
+
+
+quals : { pat_check = FALSE;} qual { pat_check = TRUE; $$ = lsing($2); }
+ | quals COMMA { pat_check = FALSE; } qual { pat_check = TRUE; $$ = lapp($1,$4); }
;
-qual : letdecls { $$ = mkseqlet($1); }
- | expL { $$ = $1; }
- | {inpat=TRUE;} expLno {inpat=FALSE;}leftexp
- { if ($4 == NULL) {
- expORpat(LEGIT_EXPR,$2);
- $$ = mkguard($2);
- } else {
- expORpat(LEGIT_PATT,$2);
- $$ = mkqual($2,$4);
- }
- }
+qual : letdecls { $$ = mkseqlet($1); }
+ | expL { expORpat(LEGIT_EXPR,$1); $$ = $1; }
+ | expLno { pat_check = TRUE; } leftexp
+ { if ($3 == NULL) {
+ expORpat(LEGIT_EXPR,$1);
+ $$ = mkguard($1);
+ } else {
+ expORpat(LEGIT_PATT,$1);
+ $$ = mkqual($1,$3);
+ }
+ }
;
alts : alt { $$ = $1; }
| gd RARROW exp gdpat { $$ = mklcons(mkpgdexp($1,$3),$4); }
;
-stmts : stmt { $$ = $1; }
- | stmts SEMI stmt { $$ = lconc($1,$3); }
+stmts : {pat_check = FALSE;} stmt {pat_check=TRUE; $$ = $2; }
+ | stmts SEMI {pat_check=FALSE;} stmt {pat_check=TRUE; $$ = lconc($1,$4); }
;
-stmt : /* empty */ { $$ = Lnil; }
- | letdecls { $$ = lsing(mkseqlet($1)); }
- | expL { $$ = lsing($1); }
- | {inpat=TRUE;} expLno {inpat=FALSE;} leftexp
- { if ($4 == NULL) {
- expORpat(LEGIT_EXPR,$2);
- $$ = lsing(mkdoexp($2,endlineno));
- } else {
- expORpat(LEGIT_PATT,$2);
- $$ = lsing(mkdobind($2,$4,endlineno));
- }
- }
+stmt : /* empty */ { $$ = Lnil; }
+ | letdecls { $$ = lsing(mkseqlet($1)); }
+ | expL { expORpat(LEGIT_EXPR,$1); $$ = lsing(mkdoexp($1,hsplineno)); }
+ | expLno {pat_check=TRUE;} leftexp
+ { if ($3 == NULL) {
+ expORpat(LEGIT_EXPR,$1);
+ $$ = lsing(mkdoexp($1,endlineno));
+ } else {
+ expORpat(LEGIT_PATT,$1);
+ $$ = lsing(mkdobind($1,$3,endlineno));
+ }
+ }
;
+
leftexp : LARROW exp { $$ = $2; }
| /* empty */ { $$ = NULL; }
;
* *
**********************************************************************/
-pat : pat qconop bpat { $$ = mkinfixap($2,$1,$3); }
+pat : qvar PLUS INTEGER { $$ = mkplusp($1, mkinteger($3)); }
+ | cpat
+ ;
+
+cpat : cpat qconop bpat { $$ = mkinfixap($2,$1,$3); }
| bpat
;
bpat : apatc
| conpat
- | qcon OCURLY rpats CCURLY { $$ = mkrecord($1,$3); }
+ | qcon OCURLY rpats CCURLY { $$ = mkrecord($1,$3); }
| MINUS INTEGER { $$ = mknegate(mklit(mkinteger($2))); }
| MINUS FLOAT { $$ = mknegate(mklit(mkfloatr($2))); }
;
| WILDCARD { $$ = mkwildp(); }
| OPAREN pat CPAREN { $$ = mkpar($2); }
| OPAREN pat COMMA pats CPAREN { $$ = mktuple(mklcons($2,$4)); }
+ | OUNBOXPAREN pat COMMA pats CUNBOXPAREN { $$ = mkutuple(mklcons($2,$4)); }
| OBRACK pats CBRACK { $$ = mkllist($2); }
| LAZY apat { $$ = mklazyp($2); }
;
/* right recursion? (WDP) */
;
-rpats : rpat { $$ = lsing($1); }
- | rpats COMMA rpat { $$ = lapp($1,$3); }
+rpats : /* empty */ { $$ = Lnil; }
+ | rpats1
+ ;
+
+rpats1 : rpat { $$ = lsing($1); }
+ | rpats1 COMMA rpat { $$ = lapp($1,$3); }
;
rpat : qvar { $$ = mkrbind($1,mknothing()); }
| WILDCARD { $$ = mkwildp(); setstartlineno(); }
| oparenkey pat CPAREN { $$ = mkpar($2); }
| oparenkey pat COMMA pats CPAREN { $$ = mktuple(mklcons($2,$4)); }
+ | ounboxparenkey pat COMMA pats CUNBOXPAREN
+ { $$ = mkutuple(mklcons($2,$4)); }
| obrackkey pats CBRACK { $$ = mkllist($2); }
| lazykey apat { $$ = mklazyp($2); }
;
gcon : qcon
- | OBRACK CBRACK { $$ = creategid(-1); }
- | OPAREN CPAREN { $$ = creategid(0); }
+ | OBRACK CBRACK { $$ = creategid(NILGID); }
+ | OPAREN CPAREN { $$ = creategid(UNITGID); }
| OPAREN commas CPAREN { $$ = creategid($2); }
;
gconk : qconk
- | obrackkey CBRACK { $$ = creategid(-1); }
- | oparenkey CPAREN { $$ = creategid(0); }
+ | obrackkey CBRACK { $$ = creategid(NILGID); }
+ | oparenkey CPAREN { $$ = creategid(UNITGID); }
| oparenkey commas CPAREN { $$ = creategid($2); }
;
* *
**********************************************************************/
-importkey: IMPORT { setstartlineno(); }
+importkey: IMPORT { setstartlineno(); $$ = 0; }
+ | IMPORT SOURCE_UPRAGMA { setstartlineno(); $$ = 1; }
;
datakey : DATA { setstartlineno();
defaultkey: DEFAULT { setstartlineno(); }
;
+foreignkey: FOREIGN { setstartlineno(); }
+ ;
+
classkey: CLASS { setstartlineno();
if(etags)
#if 1/*etags*/
oparenkey: OPAREN { setstartlineno(); }
;
+ounboxparenkey: OUNBOXPAREN { setstartlineno(); }
+ ;
+
obrackkey: OBRACK { setstartlineno(); }
;
| MINUS { $$ = install_literal("-"); }
;
+/* PLUS, BANG are valid varsyms */
+varsym_nominus : VARSYM
+ | PLUS { $$ = install_literal("+"); }
+ | BANG { $$ = install_literal("!"); }
+ | DOT { $$ = install_literal("."); }
+ ;
+
/* AS HIDING QUALIFIED are valid varids */
-varid : VARID
+varid : varid_noforall
+ | FORALL { $$ = install_literal("forall"); }
+ ;
+
+varid_noforall
+ : VARID
| AS { $$ = install_literal("as"); }
| HIDING { $$ = install_literal("hiding"); }
| QUALIFIED { $$ = install_literal("qualified"); }
- ;
-
-/* DARROW BANG are valid varsyms */
-varsym_nominus : VARSYM
- | DARROW { $$ = install_literal("=>"); }
- | BANG { $$ = install_literal("!"); }
+/* The rest of these guys are used by the FFI decls, a ghc (and hugs) extension. */
+ | EXPORT { $$ = install_literal("export"); }
+ | UNSAFE { $$ = install_literal("unsafe"); }
+ | DYNAMIC { $$ = install_literal("dynamic"); }
+ | LABEL { $$ = install_literal("label"); }
+ | C_CALL { $$ = install_literal("ccall"); }
+ | STDCALL { $$ = install_literal("stdcall"); }
+ | PASCAL { $$ = install_literal("pascal"); }
;
ccallid : VARID
| CONID
;
-tyvar : varid { $$ = mknamedtvar(mknoqual($1)); }
- ;
tycon : CONID
;
modid : CONID
;
-tyvar_list: tyvar { $$ = lsing($1); }
- | tyvar_list COMMA tyvar { $$ = lapp($1,$3); }
+/* ---------------------------------------------- */
+tyvar : varid_noforall { $$ = $1; }
+ ;
+
+/* tyvars1: At least one tyvar */
+tyvars1 : tyvar { $$ = lsing($1); }
+ | tyvar tyvars1 { $$ = mklcons($1,$2); }
;
/**********************************************************************
FN = NULL; SAMEFN = 0; PREVPATT = NULL;
hsendindent();
}
- ;
+ ;
%%
* *
**********************************************************************/
+
void
checkinpat()
{
- if(!inpat)
+ if(pat_check)
hsperror("pattern syntax used in expression");
}
-
/* The parser calls "hsperror" when it sees a
`report this and die' error. It sets the stage
and calls "yyerror".
/* We want to be able to distinguish 'error'-raised yyerrors
from yyerrors explicitly coded by the parser hacker.
*/
- if (expect_ccurly && ! error_and_I_mean_it ) {
+ if ( expect_ccurly && ! error_and_I_mean_it ) {
/*NOTHING*/;
} else {
- fprintf(stderr, "\"%s\", line %d, column %d: %s on input: ",
+ fprintf(stderr, "%s:%d:%d: %s on input: ",
input_filename, hsplineno, hspcolno + 1, s);
if (yyleng == 1 && *yytext == '\0')
projects / ghc-hetmet.git / blobdiff