1 /* $Header: consarg.c,v 3.0.1.2 89/11/17 15:11:34 lwall Locked $
3 * Copyright (c) 1989, Larry Wall
5 * You may distribute under the terms of the GNU General Public License
6 * as specified in the README file that comes with the perl 3.0 kit.
9 * Revision 3.0.1.2 89/11/17 15:11:34 lwall
10 * patch5: defined $foo{'bar'} should not create element
12 * Revision 3.0.1.1 89/11/11 04:14:30 lwall
13 * patch2: '-' x 26 made warnings about undefined value
14 * patch2: eval with no args caused strangeness
15 * patch2: local(@foo) didn't work, but local(@foo,$bar) did
17 * Revision 3.0 89/10/18 15:10:30 lwall
24 static int nothing_in_common();
25 static int arg_common();
26 static int spat_common();
29 make_split(stab,arg,limarg)
36 if (arg->arg_type != O_MATCH) {
37 Newz(201,spat,1,SPAT);
38 spat->spat_next = curstash->tbl_spatroot; /* link into spat list */
39 curstash->tbl_spatroot = spat;
41 spat->spat_runtime = arg;
42 arg = make_match(O_MATCH,stab2arg(A_STAB,defstab),spat);
47 if (limarg->arg_type == O_ITEM) {
48 Copy(limarg+1,arg+3,1,ARG);
49 limarg[1].arg_type = A_NULL;
53 arg[3].arg_type = A_EXPR;
54 arg[3].arg_ptr.arg_arg = limarg;
58 arg[3].arg_type = A_NULL;
59 arg->arg_type = O_SPLIT;
60 spat = arg[2].arg_ptr.arg_spat;
61 spat->spat_repl = stab2arg(A_STAB,aadd(stab));
62 if (spat->spat_short) { /* exact match can bypass regexec() */
63 if (!((spat->spat_flags & SPAT_SCANFIRST) &&
64 (spat->spat_flags & SPAT_ALL) )) {
65 str_free(spat->spat_short);
66 spat->spat_short = Nullstr;
73 mod_match(type,left,pat)
81 if ((pat->arg_type == O_MATCH ||
82 pat->arg_type == O_SUBST ||
83 pat->arg_type == O_TRANS ||
84 pat->arg_type == O_SPLIT
86 pat[1].arg_ptr.arg_stab == defstab ) {
87 switch (pat->arg_type) {
89 newarg = make_op(type == O_MATCH ? O_MATCH : O_NMATCH,
91 left,Nullarg,Nullarg);
94 newarg = l(make_op(type == O_MATCH ? O_SUBST : O_NSUBST,
96 left,Nullarg,Nullarg));
99 newarg = l(make_op(type == O_MATCH ? O_TRANS : O_NTRANS,
101 left,Nullarg,Nullarg));
104 newarg = make_op(type == O_MATCH ? O_SPLIT : O_SPLIT,
106 left,Nullarg,Nullarg);
109 if (pat->arg_len >= 2) {
110 newarg[2].arg_type = pat[2].arg_type;
111 newarg[2].arg_ptr = pat[2].arg_ptr;
112 newarg[2].arg_flags = pat[2].arg_flags;
113 if (pat->arg_len >= 3) {
114 newarg[3].arg_type = pat[3].arg_type;
115 newarg[3].arg_ptr = pat[3].arg_ptr;
116 newarg[3].arg_flags = pat[3].arg_flags;
122 Newz(202,spat,1,SPAT);
123 spat->spat_next = curstash->tbl_spatroot; /* link into spat list */
124 curstash->tbl_spatroot = spat;
126 spat->spat_runtime = pat;
127 newarg = make_op(type,2,left,Nullarg,Nullarg);
128 newarg[2].arg_type = A_SPAT | A_DONT;
129 newarg[2].arg_ptr.arg_spat = spat;
136 make_op(type,newlen,arg1,arg2,arg3)
146 extern ARG *arg4; /* should be normal arguments, really */
149 arg = op_new(newlen);
150 arg->arg_type = type;
151 doarg = opargs[type];
153 if (chld->arg_type == O_ITEM &&
154 (hoistable[chld[1].arg_type] || chld[1].arg_type == A_LVAL ||
155 (chld[1].arg_type == A_LEXPR &&
156 (chld[1].arg_ptr.arg_arg->arg_type == O_LIST ||
157 chld[1].arg_ptr.arg_arg->arg_type == O_ARRAY ||
158 chld[1].arg_ptr.arg_arg->arg_type == O_HASH ))))
160 arg[1].arg_type = chld[1].arg_type;
161 arg[1].arg_ptr = chld[1].arg_ptr;
162 arg[1].arg_flags |= chld[1].arg_flags;
163 arg[1].arg_len = chld[1].arg_len;
167 arg[1].arg_type = A_EXPR;
168 arg[1].arg_ptr.arg_arg = chld;
171 arg[1].arg_type |= A_DONT;
173 arg[1].arg_flags |= AF_ARYOK;
177 if (chld->arg_type == O_ITEM &&
178 (hoistable[chld[1].arg_type] ||
180 ((chld[1].arg_type == A_READ && !(arg[1].arg_type & A_DONT))
182 (chld[1].arg_type == A_INDREAD && !(arg[1].arg_type & A_DONT))
184 (chld[1].arg_type == A_GLOB && !(arg[1].arg_type & A_DONT))
186 arg[2].arg_type = chld[1].arg_type;
187 arg[2].arg_ptr = chld[1].arg_ptr;
188 arg[2].arg_len = chld[1].arg_len;
192 arg[2].arg_type = A_EXPR;
193 arg[2].arg_ptr.arg_arg = chld;
196 arg[2].arg_type |= A_DONT;
198 arg[2].arg_flags |= AF_ARYOK;
202 if (chld->arg_type == O_ITEM && hoistable[chld[1].arg_type]) {
203 arg[3].arg_type = chld[1].arg_type;
204 arg[3].arg_ptr = chld[1].arg_ptr;
205 arg[3].arg_len = chld[1].arg_len;
209 arg[3].arg_type = A_EXPR;
210 arg[3].arg_ptr.arg_arg = chld;
213 arg[3].arg_type |= A_DONT;
215 arg[3].arg_flags |= AF_ARYOK;
217 if (newlen >= 4 && (chld = arg4)) {
218 if (chld->arg_type == O_ITEM && hoistable[chld[1].arg_type]) {
219 arg[4].arg_type = chld[1].arg_type;
220 arg[4].arg_ptr = chld[1].arg_ptr;
221 arg[4].arg_len = chld[1].arg_len;
225 arg[4].arg_type = A_EXPR;
226 arg[4].arg_ptr.arg_arg = chld;
229 if (newlen >= 5 && (chld = arg5)) {
230 if (chld->arg_type == O_ITEM && hoistable[chld[1].arg_type]) {
231 arg[5].arg_type = chld[1].arg_type;
232 arg[5].arg_ptr = chld[1].arg_ptr;
233 arg[5].arg_len = chld[1].arg_len;
237 arg[5].arg_type = A_EXPR;
238 arg[5].arg_ptr.arg_arg = chld;
243 fprintf(stderr,"%lx <= make_op(%s",arg,opname[arg->arg_type]);
245 fprintf(stderr,",%s=%lx",
246 argname[arg[1].arg_type&A_MASK],arg[1].arg_ptr.arg_arg);
248 fprintf(stderr,",%s=%lx",
249 argname[arg[2].arg_type&A_MASK],arg[2].arg_ptr.arg_arg);
251 fprintf(stderr,",%s=%lx",
252 argname[arg[3].arg_type&A_MASK],arg[3].arg_ptr.arg_arg);
254 fprintf(stderr,",%s=%lx",
255 argname[arg[4].arg_type&A_MASK],arg[4].arg_ptr.arg_arg);
257 fprintf(stderr,",%s=%lx",
258 argname[arg[5].arg_type&A_MASK],arg[5].arg_ptr.arg_arg);
259 fprintf(stderr,")\n");
262 evalstatic(arg); /* see if we can consolidate anything */
273 double value; /* must not be register */
276 unsigned long tmplong;
278 double exp(), log(), sqrt(), modf();
280 double sin(), cos(), atan2(), pow();
282 if (!arg || !arg->arg_len)
285 if ((arg[1].arg_type == A_SINGLE || arg->arg_type == O_AELEM) &&
286 (arg->arg_len == 1 || arg[2].arg_type == A_SINGLE) ) {
288 s1 = arg[1].arg_ptr.arg_str;
289 if (arg->arg_len > 1)
290 s2 = arg[2].arg_ptr.arg_str;
293 switch (arg->arg_type) {
295 i = (int)str_gnum(s2);
296 if (i < 32767 && i >= 0) {
297 arg->arg_type = O_ITEM;
299 arg[1].arg_type = A_ARYSTAB; /* $abc[123] is hoistable now */
301 arg[1].arg_ptr = arg[1].arg_ptr; /* get stab pointer */
307 str = Nullstr; /* can't be evaluated yet */
314 i = (int)str_gnum(s2);
320 value = str_gnum(s1);
321 str_numset(str,value * str_gnum(s2));
324 value = str_gnum(s2);
326 yyerror("Illegal division by constant zero");
328 str_numset(str,str_gnum(s1) / value);
331 tmplong = (long)str_gnum(s2);
333 yyerror("Illegal modulus of constant zero");
336 tmp2 = (long)str_gnum(s1);
339 str_numset(str,(double)(tmp2 % tmplong));
341 str_numset(str,(double)(tmplong - (-tmp2 % tmplong)));
347 value = str_gnum(s1);
348 str_numset(str,value + str_gnum(s2));
351 value = str_gnum(s1);
352 str_numset(str,value - str_gnum(s2));
355 value = str_gnum(s1);
356 i = (int)str_gnum(s2);
358 str_numset(str,(double)(((long)value) << i));
362 value = str_gnum(s1);
363 i = (int)str_gnum(s2);
365 str_numset(str,(double)(((long)value) >> i));
369 value = str_gnum(s1);
370 str_numset(str,(value < str_gnum(s2)) ? 1.0 : 0.0);
373 value = str_gnum(s1);
374 str_numset(str,(value > str_gnum(s2)) ? 1.0 : 0.0);
377 value = str_gnum(s1);
378 str_numset(str,(value <= str_gnum(s2)) ? 1.0 : 0.0);
381 value = str_gnum(s1);
382 str_numset(str,(value >= str_gnum(s2)) ? 1.0 : 0.0);
386 if ((!s1->str_nok && !looks_like_number(s1)) ||
387 (!s2->str_nok && !looks_like_number(s2)) )
388 warn("Possible use of == on string value");
390 value = str_gnum(s1);
391 str_numset(str,(value == str_gnum(s2)) ? 1.0 : 0.0);
394 value = str_gnum(s1);
395 str_numset(str,(value != str_gnum(s2)) ? 1.0 : 0.0);
398 value = str_gnum(s1);
400 str_numset(str,(double)(((long)value) & ((long)str_gnum(s2))));
404 value = str_gnum(s1);
406 str_numset(str,(double)(((long)value) ^ ((long)str_gnum(s2))));
410 value = str_gnum(s1);
412 str_numset(str,(double)(((long)value) | ((long)str_gnum(s2))));
428 if ((arg[3].arg_type & A_MASK) != A_SINGLE) {
436 str_sset(str,arg[3].arg_ptr.arg_str);
437 str_free(arg[3].arg_ptr.arg_str);
441 str_numset(str,(double)(-str_gnum(s1)));
444 str_numset(str,(double)(!str_true(s1)));
448 str_numset(str,(double)(~(long)str_gnum(s1)));
452 str_numset(str,sin(str_gnum(s1)));
455 str_numset(str,cos(str_gnum(s1)));
458 value = str_gnum(s1);
459 str_numset(str,atan2(value, str_gnum(s2)));
462 value = str_gnum(s1);
463 str_numset(str,pow(value, str_gnum(s2)));
466 str_numset(str, (double)str_len(s1));
469 str_numset(str,(double)(str_cmp(s1,s2) < 0));
472 str_numset(str,(double)(str_cmp(s1,s2) > 0));
475 str_numset(str,(double)(str_cmp(s1,s2) <= 0));
478 str_numset(str,(double)(str_cmp(s1,s2) >= 0));
481 str_numset(str,(double)(str_eq(s1,s2)));
484 str_numset(str,(double)(!str_eq(s1,s2)));
489 str_set(str,crypt(tmps,str_get(s2)));
492 "The crypt() function is unimplemented due to excessive paranoia.");
496 str_numset(str,exp(str_gnum(s1)));
499 str_numset(str,log(str_gnum(s1)));
502 str_numset(str,sqrt(str_gnum(s1)));
505 value = str_gnum(s1);
507 (void)modf(value,&value);
509 (void)modf(-value,&value);
512 str_numset(str,value);
516 str_numset(str,(double)(*str_get(s1)));
524 str_numset(str,(double)(zapc));
530 arg->arg_type = O_ITEM; /* note arg1 type is already SINGLE */
533 arg[1].arg_ptr.arg_str = str;
548 i = arg[1].arg_type & A_MASK;
550 arg->arg_flags |= AF_COMMON; /* assume something in common */
551 /* which forces us to copy things */
554 arg[1].arg_type = A_LARYLEN;
557 if (i == A_ARYSTAB) {
558 arg[1].arg_type = A_LARYSTAB;
562 /* see if it's an array reference */
564 if (i == A_EXPR || i == A_LEXPR) {
565 arg1 = arg[1].arg_ptr.arg_arg;
567 if (arg1->arg_type == O_LIST || arg1->arg_type == O_ITEM) {
569 if (arg->arg_len > 1) {
571 arg2 = arg[2].arg_ptr.arg_arg;
572 if (nothing_in_common(arg1,arg2))
573 arg->arg_flags &= ~AF_COMMON;
574 if (arg->arg_type == O_ASSIGN) {
575 if (arg1->arg_flags & AF_LOCAL)
576 arg->arg_flags |= AF_LOCAL;
577 arg[1].arg_flags |= AF_ARYOK;
578 arg[2].arg_flags |= AF_ARYOK;
581 else if (arg->arg_type != O_CHOP)
582 arg->arg_type = O_ASSIGN; /* possible local(); */
583 for (i = arg1->arg_len; i >= 1; i--) {
584 switch (arg1[i].arg_type) {
585 case A_STAR: case A_LSTAR:
586 arg1[i].arg_type = A_LSTAR;
588 case A_STAB: case A_LVAL:
589 arg1[i].arg_type = A_LVAL;
591 case A_ARYLEN: case A_LARYLEN:
592 arg1[i].arg_type = A_LARYLEN;
594 case A_ARYSTAB: case A_LARYSTAB:
595 arg1[i].arg_type = A_LARYSTAB;
597 case A_EXPR: case A_LEXPR:
598 arg1[i].arg_type = A_LEXPR;
599 switch(arg1[i].arg_ptr.arg_arg->arg_type) {
600 case O_ARRAY: case O_LARRAY:
601 arg1[i].arg_ptr.arg_arg->arg_type = O_LARRAY;
604 case O_AELEM: case O_LAELEM:
605 arg1[i].arg_ptr.arg_arg->arg_type = O_LAELEM;
607 case O_HASH: case O_LHASH:
608 arg1[i].arg_ptr.arg_arg->arg_type = O_LHASH;
611 case O_HELEM: case O_LHELEM:
612 arg1[i].arg_ptr.arg_arg->arg_type = O_LHELEM;
614 case O_ASLICE: case O_LASLICE:
615 arg1[i].arg_ptr.arg_arg->arg_type = O_LASLICE;
617 case O_HSLICE: case O_LHSLICE:
618 arg1[i].arg_ptr.arg_arg->arg_type = O_LHSLICE;
626 (void)sprintf(tokenbuf, "Illegal item (%s) as lvalue",
627 argname[arg1[i].arg_type&A_MASK]);
631 if (arg->arg_len > 1) {
632 if (arg2->arg_type == O_SPLIT && !arg2[3].arg_type && !arghog) {
633 arg2[3].arg_type = A_SINGLE;
634 arg2[3].arg_ptr.arg_str =
635 str_nmake((double)arg1->arg_len + 1); /* limit split len*/
639 else if (arg1->arg_type == O_AELEM || arg1->arg_type == O_LAELEM)
640 if (arg->arg_type == O_DEFINED)
641 arg1->arg_type = O_AELEM;
643 arg1->arg_type = O_LAELEM;
644 else if (arg1->arg_type == O_ARRAY || arg1->arg_type == O_LARRAY) {
645 arg1->arg_type = O_LARRAY;
646 if (arg->arg_len > 1) {
648 arg2 = arg[2].arg_ptr.arg_arg;
649 if (arg2->arg_type == O_SPLIT) { /* use split's builtin =?*/
650 spat = arg2[2].arg_ptr.arg_spat;
651 if (spat->spat_repl[1].arg_ptr.arg_stab == defstab &&
652 nothing_in_common(arg1,spat->spat_repl)) {
653 spat->spat_repl[1].arg_ptr.arg_stab =
654 arg1[1].arg_ptr.arg_stab;
655 arg_free(arg1); /* recursive */
656 free_arg(arg); /* non-recursive */
657 return arg2; /* split has builtin assign */
660 else if (nothing_in_common(arg1,arg2))
661 arg->arg_flags &= ~AF_COMMON;
662 if (arg->arg_type == O_ASSIGN) {
663 arg[1].arg_flags |= AF_ARYOK;
664 arg[2].arg_flags |= AF_ARYOK;
667 else if (arg->arg_type == O_ASSIGN)
668 arg[1].arg_flags |= AF_ARYOK;
670 else if (arg1->arg_type == O_HELEM || arg1->arg_type == O_LHELEM)
671 if (arg->arg_type == O_DEFINED)
672 arg1->arg_type = O_HELEM; /* avoid creating one */
674 arg1->arg_type = O_LHELEM;
675 else if (arg1->arg_type == O_HASH || arg1->arg_type == O_LHASH) {
676 arg1->arg_type = O_LHASH;
677 if (arg->arg_len > 1) {
679 arg2 = arg[2].arg_ptr.arg_arg;
680 if (nothing_in_common(arg1,arg2))
681 arg->arg_flags &= ~AF_COMMON;
682 if (arg->arg_type == O_ASSIGN) {
683 arg[1].arg_flags |= AF_ARYOK;
684 arg[2].arg_flags |= AF_ARYOK;
687 else if (arg->arg_type == O_ASSIGN)
688 arg[1].arg_flags |= AF_ARYOK;
690 else if (arg1->arg_type == O_ASLICE) {
691 arg1->arg_type = O_LASLICE;
692 if (arg->arg_type == O_ASSIGN) {
693 arg[1].arg_flags |= AF_ARYOK;
694 arg[2].arg_flags |= AF_ARYOK;
697 else if (arg1->arg_type == O_HSLICE) {
698 arg1->arg_type = O_LHSLICE;
699 if (arg->arg_type == O_ASSIGN) {
700 arg[1].arg_flags |= AF_ARYOK;
701 arg[2].arg_flags |= AF_ARYOK;
704 else if ((arg->arg_type == O_DEFINED || arg->arg_type == O_UNDEF) &&
705 (arg1->arg_type == (perldb ? O_DBSUBR : O_SUBR)) ) {
706 arg[1].arg_type |= A_DONT;
708 else if (arg1->arg_type == O_SUBSTR || arg1->arg_type == O_VEC) {
710 Renewc(arg1->arg_ptr.arg_str, 1, struct lstring, STR);
711 /* grow string struct to hold an lstring struct */
713 else if (arg1->arg_type == O_ASSIGN) {
714 if (arg->arg_type == O_CHOP)
715 arg[1].arg_flags &= ~AF_ARYOK; /* grandfather chop idiom */
718 (void)sprintf(tokenbuf,
719 "Illegal expression (%s) as lvalue",opname[arg1->arg_type]);
722 arg[1].arg_type = A_LEXPR | (arg[1].arg_type & A_DONT);
723 if (arg->arg_type == O_ASSIGN && (arg1[1].arg_flags & AF_ARYOK)) {
724 arg[1].arg_flags |= AF_ARYOK;
725 if (arg->arg_len > 1)
726 arg[2].arg_flags |= AF_ARYOK;
730 fprintf(stderr,"lval LEXPR\n");
734 if (i == A_STAR || i == A_LSTAR) {
735 arg[1].arg_type = A_LSTAR | (arg[1].arg_type & A_DONT);
739 /* not an array reference, should be a register name */
741 if (i != A_STAB && i != A_LVAL) {
742 (void)sprintf(tokenbuf,
743 "Illegal item (%s) as lvalue",argname[arg[1].arg_type&A_MASK]);
746 arg[1].arg_type = A_LVAL | (arg[1].arg_type & A_DONT);
749 fprintf(stderr,"lval LVAL\n");
759 if (type == O_DEFINED || type == O_UNDEF) {
760 if (arg->arg_type != O_ITEM)
762 if (arg->arg_type == O_ITEM) {
763 type = arg[1].arg_type & A_MASK;
764 if (type == A_EXPR || type == A_LEXPR)
765 arg[1].arg_type = A_LEXPR|A_DONT;
776 if (arg[i].arg_type != A_EXPR) { /* dehoist */
777 tmparg = make_op(O_ITEM,1,Nullarg,Nullarg,Nullarg);
779 arg[i].arg_ptr.arg_arg = tmparg;
780 arg[i].arg_type = A_EXPR;
785 addflags(i,flags,arg)
788 arg[i].arg_flags |= flags;
796 if (arg->arg_type == O_ARRAY || arg->arg_type == O_HASH)
797 return make_op(O_ITEM,1,arg,Nullarg,Nullarg);
801 /* maybe do a join on multiple array dimensions */
807 if (arg && arg->arg_type == O_COMMA) {
809 arg = make_op(O_JOIN, 2,
810 stab2arg(A_STAB,stabent(";",TRUE)),
823 register ARG *nxtnode;
829 arg->arg_type = O_LIST;
831 if (arg->arg_type != O_COMMA) {
832 if (arg->arg_type != O_ARRAY)
833 arg->arg_flags |= AF_LISTISH; /* see listish() below */
836 for (i = 2, node = arg; ; i++) {
837 if (node->arg_len < 2)
839 if (node[1].arg_type != A_EXPR)
841 node = node[1].arg_ptr.arg_arg;
842 if (node->arg_type != O_COMMA)
848 tmpstr = arg->arg_ptr.arg_str;
850 *arg = *node; /* copy everything except the STR */
852 (void)bcopy((char *)node, (char *)arg, sizeof(ARG));
854 arg->arg_ptr.arg_str = tmpstr;
859 (void)bcopy((char *)(node+2), (char *)(arg+j), sizeof(ARG));
861 arg[j].arg_flags |= AF_ARYOK;
862 --j; /* Bug in Xenix compiler */
867 (void)bcopy((char *)(node+1), (char *)(arg+1), sizeof(ARG));
872 nxtnode = node[1].arg_ptr.arg_arg;
877 arg[1].arg_flags |= AF_ARYOK;
878 arg[2].arg_flags |= AF_ARYOK;
879 arg->arg_type = O_LIST;
884 /* turn a single item into a list */
890 if (arg->arg_flags & AF_LISTISH)
891 arg = make_op(O_LIST,1,arg,Nullarg,Nullarg);
896 maybelistish(optype, arg)
900 if (optype == O_PRTF ||
901 (arg->arg_type == O_ASLICE || arg->arg_type == O_HSLICE ||
902 arg->arg_type == O_F_OR_R) )
907 /* mark list of local variables */
913 arg->arg_flags |= AF_LOCAL;
922 if (arg->arg_len == 0)
923 arg[1].arg_type = A_NULL;
925 arg[2].arg_ptr.arg_hash = curstash;
926 arg[2].arg_type = A_NULL;
934 if (arg->arg_type == O_CONCAT && arg[2].arg_type == A_READ) {
935 arg->arg_type = O_RCAT;
936 arg[2].arg_type = arg[2].arg_ptr.arg_arg[1].arg_type;
937 arg[2].arg_ptr = arg[2].arg_ptr.arg_arg[1].arg_ptr;
938 free_arg(arg[2].arg_ptr.arg_arg);
951 arg->arg_type = O_ITEM;
952 arg[1].arg_type = atype;
953 arg[1].arg_ptr.arg_stab = stab;
964 arg->arg_type = O_ITEM;
965 arg[1].arg_type = A_SINGLE;
966 arg[1].arg_ptr.arg_str = str_make(cval,0);
977 Newz(203,arg, numargs + 1, ARG);
978 arg->arg_ptr.arg_str = Str_new(21,0);
979 arg->arg_len = numargs;
987 str_free(arg->arg_ptr.arg_str);
992 make_match(type,expr,spat)
999 arg = make_op(type,2,expr,Nullarg,Nullarg);
1001 arg[2].arg_type = A_SPAT|A_DONT;
1002 arg[2].arg_ptr.arg_spat = spat;
1005 fprintf(stderr,"make_match SPAT=%lx\n",(long)spat);
1008 if (type == O_SUBST || type == O_NSUBST) {
1009 if (arg[1].arg_type != A_STAB) {
1010 yyerror("Illegal lvalue");
1012 arg[1].arg_type = A_LVAL;
1024 arg->arg_type = O_ITEM;
1025 arg[1].arg_type = A_CMD;
1026 arg[1].arg_ptr.arg_cmd = cmd;
1030 /* Check two expressions to see if there is any identifier in common */
1033 nothing_in_common(arg1,arg2)
1037 static int thisexpr = 0; /* I don't care if this wraps */
1040 if (arg_common(arg1,thisexpr,1))
1041 return 0; /* hit eval or do {} */
1042 if (arg_common(arg2,thisexpr,0))
1043 return 0; /* hit identifier again */
1047 /* Recursively descend an expression and mark any identifier or check
1048 * it to see if it was marked already.
1052 arg_common(arg,exprnum,marking)
1061 for (i = arg->arg_len; i >= 1; i--) {
1062 switch (arg[i].arg_type & A_MASK) {
1067 if (arg_common(arg[i].arg_ptr.arg_arg,exprnum,marking))
1071 return 1; /* assume hanky panky */
1079 stab_lastexpr(arg[i].arg_ptr.arg_stab) = exprnum;
1080 else if (stab_lastexpr(arg[i].arg_ptr.arg_stab) == exprnum)
1086 register char *s = arg[i].arg_ptr.arg_str->str_ptr;
1087 register char *send = s + arg[i].arg_ptr.arg_str->str_cur;
1088 register STAB *stab;
1091 if (*s == '$' && s[1]) {
1092 s = scanreg(s,send,tokenbuf);
1093 stab = stabent(tokenbuf,TRUE);
1095 stab_lastexpr(stab) = exprnum;
1096 else if (stab_lastexpr(stab) == exprnum)
1100 else if (*s == '\\' && s[1])
1107 if (spat_common(arg[i].arg_ptr.arg_spat,exprnum,marking))
1118 switch (arg->arg_type) {
1121 if ((arg[1].arg_type & A_MASK) == A_STAB)
1122 (void)aadd(arg[1].arg_ptr.arg_stab);
1126 if ((arg[1].arg_type & A_MASK) == A_STAB)
1127 (void)hadd(arg[1].arg_ptr.arg_stab);
1138 spat_common(spat,exprnum,marking)
1139 register SPAT *spat;
1143 if (spat->spat_runtime)
1144 if (arg_common(spat->spat_runtime,exprnum,marking))
1146 if (spat->spat_repl) {
1147 if (arg_common(spat->spat_repl,exprnum,marking))