1 %{
2 /*
3 * CDDL HEADER START
4 *
5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License, Version 1.0 only
7 * (the "License"). You may not use this file except in compliance
8 * with the License.
9 *
10 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
11 * or http://www.opensolaris.org/os/licensing.
12 * See the License for the specific language governing permissions
13 * and limitations under the License.
14 *
15 * When distributing Covered Code, include this CDDL HEADER in each
16 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
17 * If applicable, add the following below this CDDL HEADER, with the
18 * fields enclosed by brackets "[]" replaced with your own identifying
19 * information: Portions Copyright [yyyy] [name of copyright owner]
20 *
21 * CDDL HEADER END
22 */
23 %}
24 /*
25 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
26 * Use is subject to license terms.
27 */
28
29 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
30 /* All Rights Reserved */
31
32 %{
33 #ident "%Z%%M% %I% %E% SMI" /* SVr4.0 2.10 */
34 %}
35
36 %{
37 #include "awk.h"
38 int yywrap(void) { return(1); }
39 #ifndef DEBUG
40 # define PUTS(x)
41 #endif
42 Node *beginloc = 0, *endloc = 0;
43 int infunc = 0; /* = 1 if in arglist or body of func */
44 uchar *curfname = 0;
45 Node *arglist = 0; /* list of args for current function */
46 static void setfname(Cell *);
47 static int constnode(Node *);
48 static uchar *strnode(Node *);
49 static Node *notnull();
50 %}
51
52 %union {
53 Node *p;
54 Cell *cp;
55 int i;
56 uchar *s;
57 }
58
59 %token <i> FIRSTTOKEN /* must be first */
60 %token <p> PROGRAM PASTAT PASTAT2 XBEGIN XEND
61 %token <i> NL ',' '{' '(' '|' ';' '/' ')' '}' '[' ']'
62 %token <i> ARRAY
63 %token <i> MATCH NOTMATCH MATCHOP
64 %token <i> FINAL DOT ALL CCL NCCL CHAR OR STAR QUEST PLUS
65 %token <i> AND BOR APPEND EQ GE GT LE LT NE IN
66 %token <i> ARG BLTIN BREAK CLOSE CONTINUE DELETE DO EXIT FOR FUNC
67 %token <i> SUB GSUB IF INDEX LSUBSTR MATCHFCN NEXT
68 %token <i> ADD MINUS MULT DIVIDE MOD
69 %token <i> ASSIGN ASGNOP ADDEQ SUBEQ MULTEQ DIVEQ MODEQ POWEQ
70 %token <i> PRINT PRINTF SPRINTF
71 %token <p> ELSE INTEST CONDEXPR
72 %token <i> POSTINCR PREINCR POSTDECR PREDECR
73 %token <cp> VAR IVAR VARNF CALL NUMBER STRING FIELD
74 %token <s> REGEXPR
75
76 %type <p> pas pattern ppattern plist pplist patlist prarg term
77 %type <p> pa_pat pa_stat pa_stats
78 %type <s> reg_expr
79 %type <p> simple_stmt opt_simple_stmt stmt stmtlist
80 %type <p> var varname funcname varlist
81 %type <p> for if while
82 %type <i> pst opt_pst lbrace rparen comma nl opt_nl and bor
83 %type <i> subop print
84
85 %right ASGNOP
86 %right '?'
87 %right ':'
88 %left BOR
89 %left AND
90 %left GETLINE
91 %nonassoc APPEND EQ GE GT LE LT NE MATCHOP IN '|'
92 %left ARG BLTIN BREAK CALL CLOSE CONTINUE DELETE DO EXIT FOR FIELD FUNC
93 %left GSUB IF INDEX LSUBSTR MATCHFCN NEXT NUMBER
94 %left PRINT PRINTF RETURN SPLIT SPRINTF STRING SUB SUBSTR
95 %left REGEXPR VAR VARNF IVAR WHILE '('
96 %left CAT
97 %left '+' '-'
98 %left '*' '/' '%'
99 %left NOT UMINUS
100 %right POWER
101 %right DECR INCR
102 %left INDIRECT
103 %token LASTTOKEN /* must be last */
104
105 %%
106
107 program:
108 pas { if (errorflag==0)
109 winner = (Node *)stat3(PROGRAM, beginloc, $1, endloc); }
110 | error { yyclearin; bracecheck(); ERROR "bailing out" SYNTAX; }
111 ;
112
113 and:
114 AND | and NL
115 ;
116
117 bor:
118 BOR | bor NL
119 ;
120
121 comma:
122 ',' | comma NL
123 ;
124
125 do:
126 DO | do NL
127 ;
128
129 else:
130 ELSE | else NL
131 ;
132
133 for:
134 FOR '(' opt_simple_stmt ';' pattern ';' opt_simple_stmt rparen stmt
135 { $$ = stat4(FOR, $3, notnull($5), $7, $9); }
136 | FOR '(' opt_simple_stmt ';' ';' opt_simple_stmt rparen stmt
137 { $$ = stat4(FOR, $3, NIL, $6, $8); }
138 | FOR '(' varname IN varname rparen stmt
139 { $$ = stat3(IN, $3, makearr($5), $7); }
140 ;
141
142 funcname:
143 VAR { setfname($1); }
144 | CALL { setfname($1); }
145 ;
146
147 if:
148 IF '(' pattern rparen { $$ = notnull($3); }
149 ;
150
151 lbrace:
152 '{' | lbrace NL
153 ;
154
155 nl:
156 NL | nl NL
157 ;
158
159 opt_nl:
160 /* empty */ { $$ = 0; }
161 | nl
162 ;
163
164 opt_pst:
165 /* empty */ { $$ = 0; }
166 | pst
167 ;
168
169
170 opt_simple_stmt:
171 /* empty */ { $$ = 0; }
172 | simple_stmt
173 ;
174
175 pas:
176 opt_pst { $$ = 0; }
177 | opt_pst pa_stats opt_pst { $$ = $2; }
178 ;
179
180 pa_pat:
181 pattern { $$ = notnull($1); }
182 ;
183
184 pa_stat:
185 pa_pat { $$ = stat2(PASTAT, $1, stat2(PRINT, rectonode(), NIL)); }
186 | pa_pat lbrace stmtlist '}' { $$ = stat2(PASTAT, $1, $3); }
187 | pa_pat ',' pa_pat { $$ = pa2stat($1, $3, stat2(PRINT, rectonode(), NIL)); }
188 | pa_pat ',' pa_pat lbrace stmtlist '}' { $$ = pa2stat($1, $3, $5); }
189 | lbrace stmtlist '}' { $$ = stat2(PASTAT, NIL, $2); }
190 | XBEGIN lbrace stmtlist '}'
191 { beginloc = linkum(beginloc, $3); $$ = 0; }
192 | XEND lbrace stmtlist '}'
193 { endloc = linkum(endloc, $3); $$ = 0; }
194 | FUNC funcname '(' varlist rparen {infunc++;} lbrace stmtlist '}'
195 { infunc--; curfname=0; defn((Cell *)$2, $4, $8); $$ = 0; }
196 ;
197
198 pa_stats:
199 pa_stat
200 | pa_stats opt_pst pa_stat { $$ = linkum($1, $3); }
201 ;
202
203 patlist:
204 pattern
205 | patlist comma pattern { $$ = linkum($1, $3); }
206 ;
207
208 ppattern:
209 var ASGNOP ppattern { $$ = op2($2, $1, $3); }
210 | ppattern '?' ppattern ':' ppattern %prec '?'
211 { $$ = op3(CONDEXPR, notnull($1), $3, $5); }
212 | ppattern bor ppattern %prec BOR
213 { $$ = op2(BOR, notnull($1), notnull($3)); }
214 | ppattern and ppattern %prec AND
215 { $$ = op2(AND, notnull($1), notnull($3)); }
216 | NOT ppattern
217 { $$ = op1(NOT, notnull($2)); }
218 | ppattern MATCHOP reg_expr { $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
219 | ppattern MATCHOP ppattern
220 { if (constnode($3))
221 $$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
222 else
223 $$ = op3($2, (Node *)1, $1, $3); }
224 | ppattern IN varname { $$ = op2(INTEST, $1, makearr($3)); }
225 | '(' plist ')' IN varname { $$ = op2(INTEST, $2, makearr($5)); }
226 | ppattern term %prec CAT { $$ = op2(CAT, $1, $2); }
227 | reg_expr
228 { $$ = op3(MATCH, NIL, rectonode(), (Node*)makedfa($1, 0)); }
229 | term
230 ;
231
232 pattern:
233 var ASGNOP pattern { $$ = op2($2, $1, $3); }
234 | pattern '?' pattern ':' pattern %prec '?'
235 { $$ = op3(CONDEXPR, notnull($1), $3, $5); }
236 | pattern bor pattern %prec BOR
237 { $$ = op2(BOR, notnull($1), notnull($3)); }
238 | pattern and pattern %prec AND
239 { $$ = op2(AND, notnull($1), notnull($3)); }
240 | NOT pattern
241 { $$ = op1(NOT, op2(NE,$2,valtonode(lookup((uchar *)"$zero&null",symtab),CCON))); }
242 | pattern EQ pattern { $$ = op2($2, $1, $3); }
243 | pattern GE pattern { $$ = op2($2, $1, $3); }
244 | pattern GT pattern { $$ = op2($2, $1, $3); }
245 | pattern LE pattern { $$ = op2($2, $1, $3); }
246 | pattern LT pattern { $$ = op2($2, $1, $3); }
247 | pattern NE pattern { $$ = op2($2, $1, $3); }
248 | pattern MATCHOP reg_expr { $$ = op3($2, NIL, $1, (Node*)makedfa($3, 0)); }
249 | pattern MATCHOP pattern
250 { if (constnode($3))
251 $$ = op3($2, NIL, $1, (Node*)makedfa(strnode($3), 0));
252 else
253 $$ = op3($2, (Node *)1, $1, $3); }
254 | pattern IN varname { $$ = op2(INTEST, $1, makearr($3)); }
255 | '(' plist ')' IN varname { $$ = op2(INTEST, $2, makearr($5)); }
256 | pattern '|' GETLINE var { $$ = op3(GETLINE, $4, (Node*)$2, $1); }
257 | pattern '|' GETLINE { $$ = op3(GETLINE, (Node*)0, (Node*)$2, $1); }
258 | pattern term %prec CAT { $$ = op2(CAT, $1, $2); }
259 | reg_expr
260 { $$ = op3(MATCH, NIL, rectonode(), (Node*)makedfa($1, 0)); }
261 | term
262 ;
263
264 plist:
265 pattern comma pattern { $$ = linkum($1, $3); }
266 | plist comma pattern { $$ = linkum($1, $3); }
267 ;
268
269 pplist:
270 ppattern
271 | pplist comma ppattern { $$ = linkum($1, $3); }
272
273 prarg:
274 /* empty */ { $$ = rectonode(); }
275 | pplist
276 | '(' plist ')' { $$ = $2; }
277 ;
278
279 print:
280 PRINT | PRINTF
281 ;
282
283 pst:
284 NL | ';' | pst NL | pst ';'
285 ;
286
287 rbrace:
288 '}' | rbrace NL
289 ;
290
291 reg_expr:
292 '/' {startreg();} REGEXPR '/' { $$ = $3; }
293 ;
294
295 rparen:
296 ')' | rparen NL
297 ;
298
299 simple_stmt:
300 print prarg '|' term { $$ = stat3($1, $2, (Node *) $3, $4); }
301 | print prarg APPEND term { $$ = stat3($1, $2, (Node *) $3, $4); }
302 | print prarg GT term { $$ = stat3($1, $2, (Node *) $3, $4); }
303 | print prarg { $$ = stat3($1, $2, NIL, NIL); }
304 | DELETE varname '[' patlist ']' { $$ = stat2(DELETE, makearr($2), $4); }
305 | DELETE varname { yyclearin; ERROR "you can only delete array[element]" SYNTAX; $$ = stat1(DELETE, $2); }
306 | pattern { $$ = exptostat($1); }
307 | error { yyclearin; ERROR "illegal statement" SYNTAX; }
308 ;
309
310 st:
311 nl | ';' opt_nl
312 ;
313
314 stmt:
315 BREAK st { $$ = stat1(BREAK, NIL); }
316 | CLOSE pattern st { $$ = stat1(CLOSE, $2); }
317 | CONTINUE st { $$ = stat1(CONTINUE, NIL); }
318 | do stmt WHILE '(' pattern ')' st
319 { $$ = stat2(DO, $2, notnull($5)); }
320 | EXIT pattern st { $$ = stat1(EXIT, $2); }
321 | EXIT st { $$ = stat1(EXIT, NIL); }
322 | for
323 | if stmt else stmt { $$ = stat3(IF, $1, $2, $4); }
324 | if stmt { $$ = stat3(IF, $1, $2, NIL); }
325 | lbrace stmtlist rbrace { $$ = $2; }
326 | NEXT st { if (infunc)
327 ERROR "next is illegal inside a function" SYNTAX;
328 $$ = stat1(NEXT, NIL); }
329 | RETURN pattern st { $$ = stat1(RETURN, $2); }
330 | RETURN st { $$ = stat1(RETURN, NIL); }
331 | simple_stmt st
332 | while stmt { $$ = stat2(WHILE, $1, $2); }
333 | ';' opt_nl { $$ = 0; }
334 ;
335
336 stmtlist:
337 stmt
338 | stmtlist stmt { $$ = linkum($1, $2); }
339 ;
340
341 subop:
342 SUB | GSUB
343 ;
344
345 term:
346 term '+' term { $$ = op2(ADD, $1, $3); }
347 | term '-' term { $$ = op2(MINUS, $1, $3); }
348 | term '*' term { $$ = op2(MULT, $1, $3); }
349 | term '/' term { $$ = op2(DIVIDE, $1, $3); }
350 | term '%' term { $$ = op2(MOD, $1, $3); }
351 | term POWER term { $$ = op2(POWER, $1, $3); }
352 | '-' term %prec UMINUS { $$ = op1(UMINUS, $2); }
353 | '+' term %prec UMINUS { $$ = $2; }
354 | BLTIN '(' ')' { $$ = op2(BLTIN, (Node *) $1, rectonode()); }
355 | BLTIN '(' patlist ')' { $$ = op2(BLTIN, (Node *) $1, $3); }
356 | BLTIN { $$ = op2(BLTIN, (Node *) $1, rectonode()); }
357 | CALL '(' ')' { $$ = op2(CALL, valtonode($1,CVAR), NIL); }
358 | CALL '(' patlist ')' { $$ = op2(CALL, valtonode($1,CVAR), $3); }
359 | DECR var { $$ = op1(PREDECR, $2); }
360 | INCR var { $$ = op1(PREINCR, $2); }
361 | var DECR { $$ = op1(POSTDECR, $1); }
362 | var INCR { $$ = op1(POSTINCR, $1); }
363 | GETLINE var LT term { $$ = op3(GETLINE, $2, (Node *)$3, $4); }
364 | GETLINE LT term { $$ = op3(GETLINE, NIL, (Node *)$2, $3); }
365 | GETLINE var { $$ = op3(GETLINE, $2, NIL, NIL); }
366 | GETLINE { $$ = op3(GETLINE, NIL, NIL, NIL); }
367 | INDEX '(' pattern comma pattern ')'
368 { $$ = op2(INDEX, $3, $5); }
369 | INDEX '(' pattern comma reg_expr ')'
370 { ERROR "index() doesn't permit regular expressions" SYNTAX;
371 $$ = op2(INDEX, $3, (Node*)$5); }
372 | '(' pattern ')' { $$ = $2; }
373 | MATCHFCN '(' pattern comma reg_expr ')'
374 { $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa($5, 1)); }
375 | MATCHFCN '(' pattern comma pattern ')'
376 { if (constnode($5))
377 $$ = op3(MATCHFCN, NIL, $3, (Node*)makedfa(strnode($5), 1));
378 else
379 $$ = op3(MATCHFCN, (Node *)1, $3, $5); }
380 | NUMBER { $$ = valtonode($1, CCON); }
381 | SPLIT '(' pattern comma varname comma pattern ')' /* string */
382 { $$ = op4(SPLIT, $3, makearr($5), $7, (Node*)STRING); }
383 | SPLIT '(' pattern comma varname comma reg_expr ')' /* const /regexp/ */
384 { $$ = op4(SPLIT, $3, makearr($5), (Node*)makedfa($7, 1), (Node *)REGEXPR); }
385 | SPLIT '(' pattern comma varname ')'
386 { $$ = op4(SPLIT, $3, makearr($5), NIL, (Node*)STRING); } /* default */
387 | SPRINTF '(' patlist ')' { $$ = op1($1, $3); }
388 | STRING { $$ = valtonode($1, CCON); }
389 | subop '(' reg_expr comma pattern ')'
390 { $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, rectonode()); }
391 | subop '(' pattern comma pattern ')'
392 { if (constnode($3))
393 $$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, rectonode());
394 else
395 $$ = op4($1, (Node *)1, $3, $5, rectonode()); }
396 | subop '(' reg_expr comma pattern comma var ')'
397 { $$ = op4($1, NIL, (Node*)makedfa($3, 1), $5, $7); }
398 | subop '(' pattern comma pattern comma var ')'
399 { if (constnode($3))
400 $$ = op4($1, NIL, (Node*)makedfa(strnode($3), 1), $5, $7);
401 else
402 $$ = op4($1, (Node *)1, $3, $5, $7); }
403 | SUBSTR '(' pattern comma pattern comma pattern ')'
404 { $$ = op3(SUBSTR, $3, $5, $7); }
405 | SUBSTR '(' pattern comma pattern ')'
406 { $$ = op3(SUBSTR, $3, $5, NIL); }
407 | var
408 ;
409
410 var:
411 varname
412 | varname '[' patlist ']' { $$ = op2(ARRAY, makearr($1), $3); }
413 | FIELD { $$ = valtonode($1, CFLD); }
414 | IVAR { $$ = op1(INDIRECT, valtonode($1, CVAR)); }
415 | INDIRECT term { $$ = op1(INDIRECT, $2); }
416 ;
417
418 varlist:
419 /* nothing */ { arglist = $$ = 0; }
420 | VAR { arglist = $$ = valtonode($1,CVAR); }
421 | varlist comma VAR { arglist = $$ = linkum($1,valtonode($3,CVAR)); }
422 ;
423
424 varname:
425 VAR { $$ = valtonode($1, CVAR); }
426 | ARG { $$ = op1(ARG, (Node *) $1); }
427 | VARNF { $$ = op1(VARNF, (Node *) $1); }
428 ;
429
430
431 while:
432 WHILE '(' pattern rparen { $$ = notnull($3); }
433 ;
434
435 %%
436
437 static void
438 setfname(Cell *p)
439 {
440 if (isarr(p))
441 ERROR "%s is an array, not a function", p->nval SYNTAX;
442 else if (isfunc(p))
443 ERROR "you can't define function %s more than once", p->nval SYNTAX;
444 curfname = p->nval;
445 }
446
447
448 static int
449 constnode(Node *p)
450 {
451 return p->ntype == NVALUE && ((Cell *) (p->narg[0]))->csub == CCON;
452 }
453
454 static uchar *
455 strnode(Node *p)
456 {
457 return ((Cell *)(p->narg[0]))->sval;
458 }
459
460 static Node *
461 notnull(Node *n)
462 {
463 switch (n->nobj) {
464 case LE: case LT: case EQ: case NE: case GT: case GE:
465 case BOR: case AND: case NOT:
466 return n;
467 default:
468 return op2(NE, n, nullnode);
469 }
470 }