[snipe.git] / parse / l4.grm

(* L4 Compiler
 * L4 grammar
 * Author: Kaustuv Chaudhuri <kaustuv+@cs.cmu.edu>
 * Modified: Frank Pfenning <fp@cs.cmu.edu>
 * Modified: Joshua Wise <jwise@andrew.cmu.edu>
 * Modified: Chris Lu <czl@andrew.cmu.edu>
 *)

structure A = Ast
structure AU = AstUtils
structure AUP = AstUtils.Program

(* for simplicity, we only mark expressions, not statements *)

(* mark e with region (left, right) in source file *)
fun mark (e, (left, right)) = A.Marked (Mark.mark' (e, ParseState.ext (left, right)))
fun markstm (e, (left, right)) = A.MarkedStm (Mark.mark' (e, ParseState.ext (left, right)))
fun markfunction (e, (left, right)) = A.MarkedFunction (Mark.mark' (e, ParseState.ext (left, right)))
fun marktypedef (e, (left, right)) = A.MarkedTypedef (Mark.mark' (e, ParseState.ext (left, right)))

(* create lval from expression; here just an id *)
(* generates error if not an identifier *)
fun make_lval (A.Var(id)) ext = id
  | make_lval (A.Marked(marked_exp)) ext =
      make_lval (Mark.data marked_exp) (Mark.ext marked_exp)
  | make_lval _ ext = ( ErrorMsg.error ext "not a variable" ;
			Symbol.bogus )

%%
%header (functor L4LrValsFn (structure Token : TOKEN))

%term 
   EOF
 | SEMI
 | INTNUM of Word32.word
 | IDENT of Symbol.symbol
 | RETURN
 | PLUS | MINUS | STAR | SLASH | PERCENT | LSH | RSH | LOGOR | LOGAND | BITAND | BITXOR | BITOR | BITNOT | BANG
 | ASSIGN | PLUSEQ | MINUSEQ | STAREQ | SLASHEQ | PERCENTEQ | LSHEQ | RSHEQ | BITANDEQ | BITXOREQ | BITOREQ
 | EQ | NEQ | LT | LE | GT | GE
 | IF | ELSE | WHILE | FOR | CONTINUE | BREAK
 | LBRACE | RBRACE
 | LPAREN | RPAREN
 | UNARY | ASNOP (* dummy *)
 | EXTERN | VAR | INT | COLON | COMMA | STRUCT | NULL | LBRACKET | RBRACKET | ARROW | DOT | NEW

%nonterm 
   program of A.program
 | programx of A.program
 | stms of A.stm list
 | stm of A.stm
 | simp of A.stm
 | return of A.stm
 | exp of A.exp
 | explist of A.exp list
 | control of A.stm
 | asnop of A.oper
 | block of A.stm list
 | simpoption of A.stm option
 | elseoption of A.stm list option
 | idents of A.ident list
 | vtype of A.vtype
 | decls of A.program
 | extdecl of A.ident * A.function
 | paramlist of A.variable list
 | param of A.variable
 | typedecl of A.ident * A.typedef
 | memberlist of (A.ident * A.vtype) list
 | member of (A.ident * A.vtype)
 | function of A.ident * A.function
 | vardecl of A.variable list
 | vardecls of A.variable list

%verbose                                (* print summary of errors *)
%pos int                                (* positions *)
%start program
%eop EOF
%noshift EOF

%name L4

%left LOGOR
%left LOGAND
%left BITOR
%left BITXOR
%left BITAND
%left EQ NEQ
%left LT LE GT GE
%left LSH RSH
%left PLUS MINUS
%left STAR SLASH PERCENT
%right UNARY
%left LPAREN LBRACKET ARROW DOT

%%

program    : programx               (programx)

programx   : decls                  (decls)
           | programx function      (AUP.append_function programx function)

vtype      : INT                    (A.Int)
           | IDENT                  (A.Typedef IDENT)
           | vtype STAR             (A.Pointer vtype)
           | vtype LBRACKET RBRACKET
                                    (A.Array vtype)

decls      :                        (Symbol.empty, Symbol.empty)
           | typedecl decls         (AUP.append_typedef decls typedecl)
           | extdecl decls          (AUP.append_function decls extdecl)

extdecl    : EXTERN vtype IDENT LPAREN RPAREN SEMI
                                    (IDENT, markfunction (A.Extern (vtype, []), (EXTERNleft, SEMIright)))
           | EXTERN vtype IDENT LPAREN paramlist RPAREN SEMI
                                    (IDENT, markfunction (A.Extern (vtype, paramlist), (EXTERNleft, SEMIright)))

paramlist  : param COMMA paramlist  (param :: paramlist)
           | param                  ([param])

param      : IDENT COLON vtype      (IDENT, vtype)

typedecl   : STRUCT IDENT LBRACE RBRACE SEMI
                                    (IDENT, marktypedef (A.Struct ([]), (STRUCTleft, SEMIright)))
           | STRUCT IDENT LBRACE memberlist RBRACE SEMI
                                    (IDENT, marktypedef (A.Struct (memberlist), (STRUCTleft, SEMIright)))

memberlist : member memberlist      (member :: memberlist)
           | member                 ([member])

member     : IDENT COLON vtype SEMI (IDENT, vtype)

function   : vtype IDENT LPAREN paramlist RPAREN LBRACE vardecls stms RBRACE
                                    (IDENT, markfunction (A.Function (vtype, paramlist, vardecls, stms), (vtypeleft, RBRACEright)))
           | vtype IDENT LPAREN RPAREN LBRACE vardecls stms RBRACE
                                    (IDENT, markfunction (A.Function (vtype, [], vardecls, stms), (vtypeleft, RBRACEright)))

vardecls   :                        ([])
           | vardecl vardecls       (vardecl @ vardecls)

vardecl    : VAR idents COLON vtype SEMI
                                    (map (fn x => (x, vtype)) idents)

idents     : IDENT                  ([IDENT])
           | IDENT COMMA idents     (IDENT :: idents)

stms       :                        ([])
           | stm stms               (stm :: stms)

stm        : simp SEMI              (simp)
           | control                (control)
           | SEMI                   (A.Nop)

simp       : exp ASSIGN exp %prec ASNOP
                                    (A.Assign(exp1, exp2))
           | exp asnop exp %prec ASNOP
                                    (A.AsnOp(asnop, exp1, exp2))
           | exp                    (markstm (A.Effect (exp), (expleft, expright)))

control    : IF LPAREN exp RPAREN block elseoption
                                    (markstm ((A.If (exp, block, elseoption)), (IFleft, elseoptionright)))
           | WHILE LPAREN exp RPAREN block
                                    (markstm ((A.While (exp, block)), (WHILEleft, blockright)))
           | FOR LPAREN simpoption SEMI exp SEMI simpoption RPAREN block
                                    (markstm ((A.For (simpoption1, exp, simpoption2, block)), (FORleft, blockright)))
           | CONTINUE SEMI          (markstm ((A.Continue), (CONTINUEleft, SEMIright)))
           | BREAK SEMI             (markstm ((A.Break), (BREAKleft, SEMIright)))
           | RETURN exp SEMI        (markstm ((A.Return exp), (RETURNleft, SEMIright)))

elseoption : ELSE block             (SOME block)
           |                        (NONE)

simpoption :                        (NONE)
           | simp                   (SOME simp)

block      : stm                    ([stm])
           | LBRACE stms RBRACE     (stms)

exp        : LPAREN exp RPAREN      (exp)
           | INTNUM                 (mark (A.ConstExp(INTNUM),(INTNUMleft,INTNUMright)))
           | IDENT                  (mark (A.Var(IDENT), (IDENTleft,IDENTright)))
           | exp DOT IDENT          (mark (A.Member(exp, IDENT), (expleft, IDENTright)))
           | exp ARROW IDENT        (mark (A.DerefMember(exp, IDENT), (expleft, IDENTright)))
           | STAR exp %prec UNARY   (mark (A.Dereference(exp), (STARleft, expright)))
           | exp LBRACKET exp RBRACKET
                                    (mark (A.ArrIndex(exp1, exp2), (exp1left, exp2right)))
           | exp PLUS exp           (mark (A.OpExp (A.PLUS, [exp1,exp2]), (exp1left,exp2right)))
           | exp MINUS exp          (mark (A.OpExp (A.MINUS, [exp1,exp2]), (exp1left,exp2right)))
           | exp STAR exp           (mark (A.OpExp (A.TIMES, [exp1,exp2]), (exp1left,exp2right)))
           | exp SLASH exp          (mark (A.OpExp (A.DIVIDEDBY, [exp1,exp2]), (exp1left,exp2right)))
           | exp PERCENT exp        (mark (A.OpExp (A.MODULO, [exp1,exp2]), (exp1left,exp2right)))
           | exp LSH exp            (mark (A.OpExp (A.LSH, [exp1,exp2]), (exp1left,exp2right)))
           | exp RSH exp            (mark (A.OpExp (A.RSH, [exp1,exp2]), (exp1left,exp2right)))
           | exp LOGOR exp          (mark (A.OpExp (A.LOGOR, [exp1,exp2]), (exp1left,exp2right)))
           | exp LOGAND exp         (mark (A.OpExp (A.LOGAND, [exp1,exp2]), (exp1left,exp2right)))
           | exp BITOR exp          (mark (A.OpExp (A.BITOR, [exp1,exp2]), (exp1left,exp2right)))
           | exp BITAND exp         (mark (A.OpExp (A.BITAND, [exp1,exp2]), (exp1left,exp2right)))
           | exp BITXOR exp         (mark (A.OpExp (A.BITXOR, [exp1,exp2]), (exp1left,exp2right)))
           | exp EQ exp             (mark (A.OpExp (A.EQ, [exp1,exp2]), (exp1left,exp2right)))
           | exp NEQ exp            (mark (A.OpExp (A.NEQ, [exp1,exp2]), (exp1left,exp2right)))
           | exp LT exp             (mark (A.OpExp (A.LT, [exp1,exp2]), (exp1left,exp2right)))
           | exp LE exp             (mark (A.OpExp (A.LE, [exp1,exp2]), (exp1left,exp2right)))
           | exp GT exp             (mark (A.OpExp (A.GT, [exp1,exp2]), (exp1left,exp2right)))
           | exp GE exp             (mark (A.OpExp (A.GE, [exp1,exp2]), (exp1left,exp2right)))
           | NULL                   (mark (A.Null, (NULLleft, NULLright)))
           | IDENT LPAREN RPAREN    (mark (A.FuncCall(IDENT, []), (IDENTleft, RPARENright)))
           | IDENT LPAREN explist RPAREN
                                    (mark (A.FuncCall(IDENT, explist), (IDENTleft, RPARENright)))
           | NEW LPAREN vtype RPAREN
                                    (mark (A.New (vtype), (NEWleft, RPARENright)))
           | NEW LPAREN vtype LBRACKET exp RBRACKET RPAREN
                                    (mark (A.NewArr (vtype, exp), (NEWleft, RPARENright)))
           | MINUS exp %prec UNARY  (mark (A.OpExp (A.NEGATIVE, [exp]), (MINUSleft,expright)))
           | BITNOT exp %prec UNARY (mark (A.OpExp (A.BITNOT, [exp]), (BITNOTleft,expright)))
           | BANG exp %prec UNARY   (mark (A.OpExp (A.BANG, [exp]), (BANGleft,expright)))

explist    : exp                    ([exp])
           | exp COMMA explist      (exp :: explist)

asnop      : PLUSEQ                (A.PLUS)
           | MINUSEQ               (A.MINUS)
           | STAREQ                (A.TIMES)
           | SLASHEQ               (A.DIVIDEDBY)
           | PERCENTEQ             (A.MODULO)
           | LSHEQ                 (A.LSH)
           | RSHEQ                 (A.RSH)
           | BITOREQ               (A.BITOR)
           | BITANDEQ              (A.BITAND)
           | BITXOREQ              (A.BITXOR)
Commit	Line	Data
1144856b JW	1	(* L4 Compiler
1144856b JW	2	* L4 grammar
0a24e44d JW	3	* Author: Kaustuv Chaudhuri <kaustuv+@cs.cmu.edu>
	4	* Modified: Frank Pfenning <fp@cs.cmu.edu>
	5	* Modified: Joshua Wise <jwise@andrew.cmu.edu>
	6	* Modified: Chris Lu <czl@andrew.cmu.edu>
	7	*)
	8
	9	structure A = Ast
1144856b JW	10	structure AU = AstUtils
1144856b JW	11	structure AUP = AstUtils.Program
0a24e44d JW	12
	13	(* for simplicity, we only mark expressions, not statements *)
	14
	15	(* mark e with region (left, right) in source file *)
	16	fun mark (e, (left, right)) = A.Marked (Mark.mark' (e, ParseState.ext (left, right)))
	17	fun markstm (e, (left, right)) = A.MarkedStm (Mark.mark' (e, ParseState.ext (left, right)))
1144856b JW	18	fun markfunction (e, (left, right)) = A.MarkedFunction (Mark.mark' (e, ParseState.ext (left, right)))
1144856b JW	19	fun marktypedef (e, (left, right)) = A.MarkedTypedef (Mark.mark' (e, ParseState.ext (left, right)))
0a24e44d JW	20
	21	(* create lval from expression; here just an id *)
	22	(* generates error if not an identifier *)
	23	fun make_lval (A.Var(id)) ext = id
	24	\| make_lval (A.Marked(marked_exp)) ext =
	25	make_lval (Mark.data marked_exp) (Mark.ext marked_exp)
	26	\| make_lval _ ext = ( ErrorMsg.error ext "not a variable" ;
	27	Symbol.bogus )
	28
0a24e44d	29	%%
1144856b	30	%header (functor L4LrValsFn (structure Token : TOKEN))
0a24e44d JW	31
	32	%term
	33	EOF
	34	\| SEMI
	35	\| INTNUM of Word32.word
	36	\| IDENT of Symbol.symbol
	37	\| RETURN
	38	\| PLUS \| MINUS \| STAR \| SLASH \| PERCENT \| LSH \| RSH \| LOGOR \| LOGAND \| BITAND \| BITXOR \| BITOR \| BITNOT \| BANG
	39	\| ASSIGN \| PLUSEQ \| MINUSEQ \| STAREQ \| SLASHEQ \| PERCENTEQ \| LSHEQ \| RSHEQ \| BITANDEQ \| BITXOREQ \| BITOREQ
	40	\| EQ \| NEQ \| LT \| LE \| GT \| GE
	41	\| IF \| ELSE \| WHILE \| FOR \| CONTINUE \| BREAK
	42	\| LBRACE \| RBRACE
	43	\| LPAREN \| RPAREN
	44	\| UNARY \| ASNOP (* dummy *)
1144856b	45	\| EXTERN \| VAR \| INT \| COLON \| COMMA \| STRUCT \| NULL \| LBRACKET \| RBRACKET \| ARROW \| DOT \| NEW
0a24e44d JW	46
	47	%nonterm
	48	program of A.program
1144856b	49	\| programx of A.program
0a24e44d JW	50	\| stms of A.stm list
	51	\| stm of A.stm
	52	\| simp of A.stm
	53	\| return of A.stm
	54	\| exp of A.exp
6ade8b0a	55	\| explist of A.exp list
0a24e44d	56	\| control of A.stm
1144856b	57	\| asnop of A.oper
0a24e44d JW	58	\| block of A.stm list
	59	\| simpoption of A.stm option
	60	\| elseoption of A.stm list option
6ade8b0a JW	61	\| idents of A.ident list
6ade8b0a JW	62	\| vtype of A.vtype
1144856b JW	63	\| decls of A.program
1144856b JW	64	\| extdecl of A.ident * A.function
6ade8b0a JW	65	\| paramlist of A.variable list
6ade8b0a JW	66	\| param of A.variable
1144856b JW	67	\| typedecl of A.ident * A.typedef
	68	\| memberlist of (A.ident * A.vtype) list
	69	\| member of (A.ident * A.vtype)
	70	\| function of A.ident * A.function
6ade8b0a JW	71	\| vardecl of A.variable list
6ade8b0a JW	72	\| vardecls of A.variable list
0a24e44d JW	73
	74	%verbose (* print summary of errors *)
	75	%pos int (* positions *)
	76	%start program
	77	%eop EOF
	78	%noshift EOF
	79
1144856b	80	%name L4
0a24e44d JW	81
	82	%left LOGOR
	83	%left LOGAND
	84	%left BITOR
	85	%left BITXOR
	86	%left BITAND
	87	%left EQ NEQ
	88	%left LT LE GT GE
	89	%left LSH RSH
	90	%left PLUS MINUS
	91	%left STAR SLASH PERCENT
	92	%right UNARY
1144856b	93	%left LPAREN LBRACKET ARROW DOT
0a24e44d JW	94
	95	%%
	96
1144856b JW	97	program : programx (programx)
	98
	99	programx : decls (decls)
	100	\| programx function (AUP.append_function programx function)
6ade8b0a JW	101
6ade8b0a JW	102	vtype : INT (A.Int)
1144856b JW	103	\| IDENT (A.Typedef IDENT)
	104	\| vtype STAR (A.Pointer vtype)
	105	\| vtype LBRACKET RBRACKET
	106	(A.Array vtype)
6ade8b0a	107
1144856b JW	108	decls : (Symbol.empty, Symbol.empty)
	109	\| typedecl decls (AUP.append_typedef decls typedecl)
	110	\| extdecl decls (AUP.append_function decls extdecl)
6ade8b0a JW	111
6ade8b0a JW	112	extdecl : EXTERN vtype IDENT LPAREN RPAREN SEMI
1144856b	113	(IDENT, markfunction (A.Extern (vtype, []), (EXTERNleft, SEMIright)))
6ade8b0a	114	\| EXTERN vtype IDENT LPAREN paramlist RPAREN SEMI
1144856b	115	(IDENT, markfunction (A.Extern (vtype, paramlist), (EXTERNleft, SEMIright)))
6ade8b0a JW	116
	117	paramlist : param COMMA paramlist (param :: paramlist)
	118	\| param ([param])
	119
	120	param : IDENT COLON vtype (IDENT, vtype)
	121
1144856b JW	122	typedecl : STRUCT IDENT LBRACE RBRACE SEMI
	123	(IDENT, marktypedef (A.Struct ([]), (STRUCTleft, SEMIright)))
	124	\| STRUCT IDENT LBRACE memberlist RBRACE SEMI
	125	(IDENT, marktypedef (A.Struct (memberlist), (STRUCTleft, SEMIright)))
	126
	127	memberlist : member memberlist (member :: memberlist)
	128	\| member ([member])
	129
	130	member : IDENT COLON vtype SEMI (IDENT, vtype)
6ade8b0a	131
1144856b JW	132	function : vtype IDENT LPAREN paramlist RPAREN LBRACE vardecls stms RBRACE
	133	(IDENT, markfunction (A.Function (vtype, paramlist, vardecls, stms), (vtypeleft, RBRACEright)))
	134	\| vtype IDENT LPAREN RPAREN LBRACE vardecls stms RBRACE
	135	(IDENT, markfunction (A.Function (vtype, [], vardecls, stms), (vtypeleft, RBRACEright)))
6ade8b0a JW	136
	137	vardecls : ([])
	138	\| vardecl vardecls (vardecl @ vardecls)
	139
	140	vardecl : VAR idents COLON vtype SEMI
	141	(map (fn x => (x, vtype)) idents)
	142
	143	idents : IDENT ([IDENT])
	144	\| IDENT COMMA idents (IDENT :: idents)
0a24e44d JW	145
	146	stms : ([])
	147	\| stm stms (stm :: stms)
	148
6ade8b0a JW	149	stm : simp SEMI (simp)
	150	\| control (control)
	151	\| SEMI (A.Nop)
0a24e44d	152
1144856b JW	153	simp : exp ASSIGN exp %prec ASNOP
	154	(A.Assign(exp1, exp2))
	155	\| exp asnop exp %prec ASNOP
	156	(A.AsnOp(asnop, exp1, exp2))
	157	\| exp (markstm (A.Effect (exp), (expleft, expright)))
0a24e44d JW	158
	159	control : IF LPAREN exp RPAREN block elseoption
	160	(markstm ((A.If (exp, block, elseoption)), (IFleft, elseoptionright)))
	161	\| WHILE LPAREN exp RPAREN block
	162	(markstm ((A.While (exp, block)), (WHILEleft, blockright)))
	163	\| FOR LPAREN simpoption SEMI exp SEMI simpoption RPAREN block
	164	(markstm ((A.For (simpoption1, exp, simpoption2, block)), (FORleft, blockright)))
	165	\| CONTINUE SEMI (markstm ((A.Continue), (CONTINUEleft, SEMIright)))
	166	\| BREAK SEMI (markstm ((A.Break), (BREAKleft, SEMIright)))
	167	\| RETURN exp SEMI (markstm ((A.Return exp), (RETURNleft, SEMIright)))
	168
	169	elseoption : ELSE block (SOME block)
	170	\| (NONE)
	171
	172	simpoption : (NONE)
	173	\| simp (SOME simp)
	174
	175	block : stm ([stm])
	176	\| LBRACE stms RBRACE (stms)
	177
	178	exp : LPAREN exp RPAREN (exp)
	179	\| INTNUM (mark (A.ConstExp(INTNUM),(INTNUMleft,INTNUMright)))
	180	\| IDENT (mark (A.Var(IDENT), (IDENTleft,IDENTright)))
1144856b JW	181	\| exp DOT IDENT (mark (A.Member(exp, IDENT), (expleft, IDENTright)))
	182	\| exp ARROW IDENT (mark (A.DerefMember(exp, IDENT), (expleft, IDENTright)))
	183	\| STAR exp %prec UNARY (mark (A.Dereference(exp), (STARleft, expright)))
	184	\| exp LBRACKET exp RBRACKET
	185	(mark (A.ArrIndex(exp1, exp2), (exp1left, exp2right)))
0a24e44d JW	186	\| exp PLUS exp (mark (A.OpExp (A.PLUS, [exp1,exp2]), (exp1left,exp2right)))
	187	\| exp MINUS exp (mark (A.OpExp (A.MINUS, [exp1,exp2]), (exp1left,exp2right)))
	188	\| exp STAR exp (mark (A.OpExp (A.TIMES, [exp1,exp2]), (exp1left,exp2right)))
	189	\| exp SLASH exp (mark (A.OpExp (A.DIVIDEDBY, [exp1,exp2]), (exp1left,exp2right)))
	190	\| exp PERCENT exp (mark (A.OpExp (A.MODULO, [exp1,exp2]), (exp1left,exp2right)))
	191	\| exp LSH exp (mark (A.OpExp (A.LSH, [exp1,exp2]), (exp1left,exp2right)))
	192	\| exp RSH exp (mark (A.OpExp (A.RSH, [exp1,exp2]), (exp1left,exp2right)))
	193	\| exp LOGOR exp (mark (A.OpExp (A.LOGOR, [exp1,exp2]), (exp1left,exp2right)))
	194	\| exp LOGAND exp (mark (A.OpExp (A.LOGAND, [exp1,exp2]), (exp1left,exp2right)))
	195	\| exp BITOR exp (mark (A.OpExp (A.BITOR, [exp1,exp2]), (exp1left,exp2right)))
	196	\| exp BITAND exp (mark (A.OpExp (A.BITAND, [exp1,exp2]), (exp1left,exp2right)))
	197	\| exp BITXOR exp (mark (A.OpExp (A.BITXOR, [exp1,exp2]), (exp1left,exp2right)))
	198	\| exp EQ exp (mark (A.OpExp (A.EQ, [exp1,exp2]), (exp1left,exp2right)))
	199	\| exp NEQ exp (mark (A.OpExp (A.NEQ, [exp1,exp2]), (exp1left,exp2right)))
	200	\| exp LT exp (mark (A.OpExp (A.LT, [exp1,exp2]), (exp1left,exp2right)))
	201	\| exp LE exp (mark (A.OpExp (A.LE, [exp1,exp2]), (exp1left,exp2right)))
	202	\| exp GT exp (mark (A.OpExp (A.GT, [exp1,exp2]), (exp1left,exp2right)))
	203	\| exp GE exp (mark (A.OpExp (A.GE, [exp1,exp2]), (exp1left,exp2right)))
1144856b	204	\| NULL (mark (A.Null, (NULLleft, NULLright)))
6ade8b0a	205	\| IDENT LPAREN RPAREN (mark (A.FuncCall(IDENT, []), (IDENTleft, RPARENright)))
6ade8b0a JW	206	\| IDENT LPAREN explist RPAREN
6ade8b0a JW	207	(mark (A.FuncCall(IDENT, explist), (IDENTleft, RPARENright)))
1144856b JW	208	\| NEW LPAREN vtype RPAREN
	209	(mark (A.New (vtype), (NEWleft, RPARENright)))
	210	\| NEW LPAREN vtype LBRACKET exp RBRACKET RPAREN
	211	(mark (A.NewArr (vtype, exp), (NEWleft, RPARENright)))
0a24e44d JW	212	\| MINUS exp %prec UNARY (mark (A.OpExp (A.NEGATIVE, [exp]), (MINUSleft,expright)))
	213	\| BITNOT exp %prec UNARY (mark (A.OpExp (A.BITNOT, [exp]), (BITNOTleft,expright)))
	214	\| BANG exp %prec UNARY (mark (A.OpExp (A.BANG, [exp]), (BANGleft,expright)))
	215
6ade8b0a JW	216	explist : exp ([exp])
	217	\| exp COMMA explist (exp :: explist)
	218
1144856b JW	219	asnop : PLUSEQ (A.PLUS)
	220	\| MINUSEQ (A.MINUS)
	221	\| STAREQ (A.TIMES)
	222	\| SLASHEQ (A.DIVIDEDBY)
	223	\| PERCENTEQ (A.MODULO)
	224	\| LSHEQ (A.LSH)
	225	\| RSHEQ (A.RSH)
	226	\| BITOREQ (A.BITOR)
	227	\| BITANDEQ (A.BITAND)
	228	\| BITXOREQ (A.BITXOR)