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0a24e44d JW |
1 | (* L2 Compiler |
2 | * L2 grammar | |
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 | |
10 | ||
11 | (* for simplicity, we only mark expressions, not statements *) | |
12 | ||
13 | (* mark e with region (left, right) in source file *) | |
14 | fun mark (e, (left, right)) = A.Marked (Mark.mark' (e, ParseState.ext (left, right))) | |
15 | fun markstm (e, (left, right)) = A.MarkedStm (Mark.mark' (e, ParseState.ext (left, right))) | |
16 | ||
17 | (* create lval from expression; here just an id *) | |
18 | (* generates error if not an identifier *) | |
19 | fun make_lval (A.Var(id)) ext = id | |
20 | | make_lval (A.Marked(marked_exp)) ext = | |
21 | make_lval (Mark.data marked_exp) (Mark.ext marked_exp) | |
22 | | make_lval _ ext = ( ErrorMsg.error ext "not a variable" ; | |
23 | Symbol.bogus ) | |
24 | ||
25 | (* expand_asnop (exp1, "op=", exp2) region = "exp1 = exp1 op exps" | |
26 | * or = "exp1 = exp2" if asnop is "=" | |
27 | * generates error if exp1 is an lval (identifier) | |
28 | * syntactically expands a compound assignment operator | |
29 | *) | |
30 | fun expand_asnop (exp1, NONE, exp2) (left, right) = | |
31 | A.Assign(make_lval exp1 NONE, exp2) | |
32 | | expand_asnop (exp1, SOME(oper), exp2) (left, right) = | |
33 | A.Assign(make_lval exp1 NONE, | |
34 | mark(A.OpExp(oper, [exp1, exp2]), (left, right))) | |
35 | ||
36 | %% | |
37 | %header (functor L2LrValsFn (structure Token : TOKEN)) | |
38 | ||
39 | %term | |
40 | EOF | |
41 | | SEMI | |
42 | | INTNUM of Word32.word | |
43 | | IDENT of Symbol.symbol | |
44 | | RETURN | |
45 | | PLUS | MINUS | STAR | SLASH | PERCENT | LSH | RSH | LOGOR | LOGAND | BITAND | BITXOR | BITOR | BITNOT | BANG | |
46 | | ASSIGN | PLUSEQ | MINUSEQ | STAREQ | SLASHEQ | PERCENTEQ | LSHEQ | RSHEQ | BITANDEQ | BITXOREQ | BITOREQ | |
47 | | EQ | NEQ | LT | LE | GT | GE | |
48 | | IF | ELSE | WHILE | FOR | CONTINUE | BREAK | |
49 | | LBRACE | RBRACE | |
50 | | LPAREN | RPAREN | |
51 | | UNARY | ASNOP (* dummy *) | |
52 | ||
53 | %nonterm | |
54 | program of A.program | |
55 | | stms of A.stm list | |
56 | | stm of A.stm | |
57 | | simp of A.stm | |
58 | | return of A.stm | |
59 | | exp of A.exp | |
60 | | control of A.stm | |
61 | | asnop of A.oper option | |
62 | | block of A.stm list | |
63 | | simpoption of A.stm option | |
64 | | elseoption of A.stm list option | |
65 | ||
66 | %verbose (* print summary of errors *) | |
67 | %pos int (* positions *) | |
68 | %start program | |
69 | %eop EOF | |
70 | %noshift EOF | |
71 | ||
72 | %name L2 | |
73 | ||
74 | %left LOGOR | |
75 | %left LOGAND | |
76 | %left BITOR | |
77 | %left BITXOR | |
78 | %left BITAND | |
79 | %left EQ NEQ | |
80 | %left LT LE GT GE | |
81 | %left LSH RSH | |
82 | %left PLUS MINUS | |
83 | %left STAR SLASH PERCENT | |
84 | %right UNARY | |
85 | %left LPAREN | |
86 | ||
87 | %% | |
88 | ||
89 | program : LBRACE stms RBRACE | |
90 | (stms) | |
91 | ||
92 | stms : ([]) | |
93 | | stm stms (stm :: stms) | |
94 | ||
95 | stm : simp SEMI (simp) | |
96 | | control (control) | |
97 | | SEMI (A.Nop) | |
98 | ||
99 | simp : exp asnop exp %prec ASNOP | |
100 | (expand_asnop (exp1, asnop, exp2) (exp1left, exp2right)) | |
101 | ||
102 | control : IF LPAREN exp RPAREN block elseoption | |
103 | (markstm ((A.If (exp, block, elseoption)), (IFleft, elseoptionright))) | |
104 | | WHILE LPAREN exp RPAREN block | |
105 | (markstm ((A.While (exp, block)), (WHILEleft, blockright))) | |
106 | | FOR LPAREN simpoption SEMI exp SEMI simpoption RPAREN block | |
107 | (markstm ((A.For (simpoption1, exp, simpoption2, block)), (FORleft, blockright))) | |
108 | | CONTINUE SEMI (markstm ((A.Continue), (CONTINUEleft, SEMIright))) | |
109 | | BREAK SEMI (markstm ((A.Break), (BREAKleft, SEMIright))) | |
110 | | RETURN exp SEMI (markstm ((A.Return exp), (RETURNleft, SEMIright))) | |
111 | ||
112 | elseoption : ELSE block (SOME block) | |
113 | | (NONE) | |
114 | ||
115 | simpoption : (NONE) | |
116 | | simp (SOME simp) | |
117 | ||
118 | block : stm ([stm]) | |
119 | | LBRACE stms RBRACE (stms) | |
120 | ||
121 | exp : LPAREN exp RPAREN (exp) | |
122 | | INTNUM (mark (A.ConstExp(INTNUM),(INTNUMleft,INTNUMright))) | |
123 | | IDENT (mark (A.Var(IDENT), (IDENTleft,IDENTright))) | |
124 | | exp PLUS exp (mark (A.OpExp (A.PLUS, [exp1,exp2]), (exp1left,exp2right))) | |
125 | | exp MINUS exp (mark (A.OpExp (A.MINUS, [exp1,exp2]), (exp1left,exp2right))) | |
126 | | exp STAR exp (mark (A.OpExp (A.TIMES, [exp1,exp2]), (exp1left,exp2right))) | |
127 | | exp SLASH exp (mark (A.OpExp (A.DIVIDEDBY, [exp1,exp2]), (exp1left,exp2right))) | |
128 | | exp PERCENT exp (mark (A.OpExp (A.MODULO, [exp1,exp2]), (exp1left,exp2right))) | |
129 | | exp LSH exp (mark (A.OpExp (A.LSH, [exp1,exp2]), (exp1left,exp2right))) | |
130 | | exp RSH exp (mark (A.OpExp (A.RSH, [exp1,exp2]), (exp1left,exp2right))) | |
131 | | exp LOGOR exp (mark (A.OpExp (A.LOGOR, [exp1,exp2]), (exp1left,exp2right))) | |
132 | | exp LOGAND exp (mark (A.OpExp (A.LOGAND, [exp1,exp2]), (exp1left,exp2right))) | |
133 | | exp BITOR exp (mark (A.OpExp (A.BITOR, [exp1,exp2]), (exp1left,exp2right))) | |
134 | | exp BITAND exp (mark (A.OpExp (A.BITAND, [exp1,exp2]), (exp1left,exp2right))) | |
135 | | exp BITXOR exp (mark (A.OpExp (A.BITXOR, [exp1,exp2]), (exp1left,exp2right))) | |
136 | | exp EQ exp (mark (A.OpExp (A.EQ, [exp1,exp2]), (exp1left,exp2right))) | |
137 | | exp NEQ exp (mark (A.OpExp (A.NEQ, [exp1,exp2]), (exp1left,exp2right))) | |
138 | | exp LT exp (mark (A.OpExp (A.LT, [exp1,exp2]), (exp1left,exp2right))) | |
139 | | exp LE exp (mark (A.OpExp (A.LE, [exp1,exp2]), (exp1left,exp2right))) | |
140 | | exp GT exp (mark (A.OpExp (A.GT, [exp1,exp2]), (exp1left,exp2right))) | |
141 | | exp GE exp (mark (A.OpExp (A.GE, [exp1,exp2]), (exp1left,exp2right))) | |
142 | | MINUS exp %prec UNARY (mark (A.OpExp (A.NEGATIVE, [exp]), (MINUSleft,expright))) | |
143 | | BITNOT exp %prec UNARY (mark (A.OpExp (A.BITNOT, [exp]), (BITNOTleft,expright))) | |
144 | | BANG exp %prec UNARY (mark (A.OpExp (A.BANG, [exp]), (BANGleft,expright))) | |
145 | ||
146 | asnop : ASSIGN (NONE) | |
147 | | PLUSEQ (SOME(A.PLUS)) | |
148 | | MINUSEQ (SOME(A.MINUS)) | |
149 | | STAREQ (SOME(A.TIMES)) | |
150 | | SLASHEQ (SOME(A.DIVIDEDBY)) | |
151 | | PERCENTEQ (SOME(A.MODULO)) | |
152 | | LSHEQ (SOME(A.LSH)) | |
153 | | RSHEQ (SOME(A.RSH)) | |
154 | | BITOREQ (SOME(A.BITOR)) | |
155 | | BITANDEQ (SOME(A.BITAND)) | |
156 | | BITXOREQ (SOME(A.BITXOR)) |