5 * The contents of this file are subject to the terms of the
6 * Common Development and Distribution License (the "License").
7 * You may not use this file except in compliance with the License.
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #pragma ident "%Z%%M% %I% %E% SMI"
36 #include <dt_grammar.h>
37 #include <dt_parser.h>
38 #include <dt_string.h>
41 * We need to undefine lex's input and unput macros so that references to these
42 * call the functions provided at the end of this source file.
49 * Define YY_INPUT for flex since input() can't be re-defined.
51 #define YY_INPUT(buf,result,max_size) \
52 if (yypcb->pcb_fileptr != NULL) { \
53 if (((result = fread(buf, 1, max_size, yypcb->pcb_fileptr)) == 0) \
54 && ferror(yypcb->pcb_fileptr)) \
55 longjmp(yypcb->pcb_jmpbuf, EDT_FIO); \
58 for (n = 0; n < max_size && \
59 yypcb->pcb_strptr < yypcb->pcb_string + yypcb->pcb_strlen; n++) \
60 buf[n] = *yypcb->pcb_strptr++; \
65 static int id_or_type(const char *);
67 static int input(void);
68 static void unput(int);
72 * We first define a set of labeled states for use in the D lexer and then a
73 * set of regular expressions to simplify things below. The lexer states are:
75 * S0 - D program clause and expression lexing
76 * S1 - D comments (i.e. skip everything until end of comment)
77 * S2 - D program outer scope (probe specifiers and declarations)
78 * S3 - D control line parsing (i.e. after ^# is seen but before \n)
79 * S4 - D control line scan (locate control directives only and invoke S3)
83 %e 1500 /* maximum nodes */
84 %p 3700 /* maximum positions */
85 %n 600 /* maximum states */
89 RGX_AGG "@"[a-zA-Z_][0-9a-zA-Z_]*
90 RGX_PSPEC [-$:a-zA-Z_.?*\\\[\]!][-$:0-9a-zA-Z_.`?*\\\[\]!]*
91 RGX_IDENT [a-zA-Z_`][0-9a-zA-Z_`]*
92 RGX_INT ([0-9]+|0[xX][0-9A-Fa-f]+)[uU]?[lL]?[lL]?
93 RGX_FP ([0-9]+("."?)[0-9]*|"."[0-9]+)((e|E)("+"|-)?[0-9]+)?[fFlL]?
95 RGX_STR ([^"\\\n]|\\[^"\n]|\\\")*
96 RGX_CHR ([^'\\\n]|\\[^'\n]|\\')*
97 RGX_INTERP ^[\f\t\v ]*#!.*
105 * We insert a special prologue into yylex() itself: if the pcb contains a
106 * context token, we return that prior to running the normal lexer. This
107 * allows libdtrace to force yacc into one of our three parsing contexts: D
108 * expression (DT_CTX_DEXPR), D program (DT_CTX_DPROG) or D type (DT_CTX_DTYPE).
109 * Once the token is returned, we clear it so this only happens once.
111 if (yypcb->pcb_token != 0) {
112 int tok = yypcb->pcb_token;
113 yypcb->pcb_token = 0;
119 <S0>auto return (DT_KEY_AUTO);
120 <S0>break return (DT_KEY_BREAK);
121 <S0>case return (DT_KEY_CASE);
122 <S0>char return (DT_KEY_CHAR);
123 <S0>const return (DT_KEY_CONST);
124 <S0>continue return (DT_KEY_CONTINUE);
125 <S0>counter return (DT_KEY_COUNTER);
126 <S0>default return (DT_KEY_DEFAULT);
127 <S0>do return (DT_KEY_DO);
128 <S0>double return (DT_KEY_DOUBLE);
129 <S0>else return (DT_KEY_ELSE);
130 <S0>enum return (DT_KEY_ENUM);
131 <S0>extern return (DT_KEY_EXTERN);
132 <S0>float return (DT_KEY_FLOAT);
133 <S0>for return (DT_KEY_FOR);
134 <S0>goto return (DT_KEY_GOTO);
135 <S0>if return (DT_KEY_IF);
136 <S0>import return (DT_KEY_IMPORT);
137 <S0>inline return (DT_KEY_INLINE);
138 <S0>int return (DT_KEY_INT);
139 <S0>long return (DT_KEY_LONG);
140 <S0>offsetof return (DT_TOK_OFFSETOF);
141 <S0>probe return (DT_KEY_PROBE);
142 <S0>provider return (DT_KEY_PROVIDER);
143 <S0>register return (DT_KEY_REGISTER);
144 <S0>restrict return (DT_KEY_RESTRICT);
145 <S0>return return (DT_KEY_RETURN);
146 <S0>self return (DT_KEY_SELF);
147 <S0>short return (DT_KEY_SHORT);
148 <S0>signed return (DT_KEY_SIGNED);
149 <S0>sizeof return (DT_TOK_SIZEOF);
150 <S0>static return (DT_KEY_STATIC);
151 <S0>string return (DT_KEY_STRING);
152 <S0>stringof return (DT_TOK_STRINGOF);
153 <S0>struct return (DT_KEY_STRUCT);
154 <S0>switch return (DT_KEY_SWITCH);
155 <S0>this return (DT_KEY_THIS);
156 <S0>translator return (DT_KEY_XLATOR);
157 <S0>typedef return (DT_KEY_TYPEDEF);
158 <S0>union return (DT_KEY_UNION);
159 <S0>unsigned return (DT_KEY_UNSIGNED);
160 <S0>void return (DT_KEY_VOID);
161 <S0>volatile return (DT_KEY_VOLATILE);
162 <S0>while return (DT_KEY_WHILE);
163 <S0>xlate return (DT_TOK_XLATE);
165 <S2>auto { yybegin(YYS_EXPR); return (DT_KEY_AUTO); }
166 <S2>char { yybegin(YYS_EXPR); return (DT_KEY_CHAR); }
167 <S2>const { yybegin(YYS_EXPR); return (DT_KEY_CONST); }
168 <S2>counter { yybegin(YYS_DEFINE); return (DT_KEY_COUNTER); }
169 <S2>double { yybegin(YYS_EXPR); return (DT_KEY_DOUBLE); }
170 <S2>enum { yybegin(YYS_EXPR); return (DT_KEY_ENUM); }
171 <S2>extern { yybegin(YYS_EXPR); return (DT_KEY_EXTERN); }
172 <S2>float { yybegin(YYS_EXPR); return (DT_KEY_FLOAT); }
173 <S2>import { yybegin(YYS_EXPR); return (DT_KEY_IMPORT); }
174 <S2>inline { yybegin(YYS_DEFINE); return (DT_KEY_INLINE); }
175 <S2>int { yybegin(YYS_EXPR); return (DT_KEY_INT); }
176 <S2>long { yybegin(YYS_EXPR); return (DT_KEY_LONG); }
177 <S2>provider { yybegin(YYS_DEFINE); return (DT_KEY_PROVIDER); }
178 <S2>register { yybegin(YYS_EXPR); return (DT_KEY_REGISTER); }
179 <S2>restrict { yybegin(YYS_EXPR); return (DT_KEY_RESTRICT); }
180 <S2>self { yybegin(YYS_EXPR); return (DT_KEY_SELF); }
181 <S2>short { yybegin(YYS_EXPR); return (DT_KEY_SHORT); }
182 <S2>signed { yybegin(YYS_EXPR); return (DT_KEY_SIGNED); }
183 <S2>static { yybegin(YYS_EXPR); return (DT_KEY_STATIC); }
184 <S2>string { yybegin(YYS_EXPR); return (DT_KEY_STRING); }
185 <S2>struct { yybegin(YYS_EXPR); return (DT_KEY_STRUCT); }
186 <S2>this { yybegin(YYS_EXPR); return (DT_KEY_THIS); }
187 <S2>translator { yybegin(YYS_DEFINE); return (DT_KEY_XLATOR); }
188 <S2>typedef { yybegin(YYS_EXPR); return (DT_KEY_TYPEDEF); }
189 <S2>union { yybegin(YYS_EXPR); return (DT_KEY_UNION); }
190 <S2>unsigned { yybegin(YYS_EXPR); return (DT_KEY_UNSIGNED); }
191 <S2>void { yybegin(YYS_EXPR); return (DT_KEY_VOID); }
192 <S2>volatile { yybegin(YYS_EXPR); return (DT_KEY_VOLATILE); }
195 int i = atoi(yytext + 2);
199 * A macro argument reference substitutes the text of
200 * an argument in place of the current token. When we
201 * see $$<d> we fetch the saved string from pcb_sargv
202 * (or use the default argument if the option has been
203 * set and the argument hasn't been specified) and
204 * return a token corresponding to this string.
206 if (i < 0 || (i >= yypcb->pcb_sargc &&
207 !(yypcb->pcb_cflags & DTRACE_C_DEFARG))) {
208 xyerror(D_MACRO_UNDEF, "macro argument %s is "
209 "not defined\n", yytext);
212 if (i < yypcb->pcb_sargc) {
213 v = yypcb->pcb_sargv[i]; /* get val from pcb */
214 yypcb->pcb_sflagv[i] |= DT_IDFLG_REF;
217 if ((yylval.l_str = strdup(v)) == NULL)
218 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
220 (void) stresc2chr(yylval.l_str);
221 return (DT_TOK_STRING);
225 int i = atoi(yytext + 1);
229 * A macro argument reference substitutes the text of
230 * one identifier or integer pattern for another. When
231 * we see $<d> we fetch the saved string from pcb_sargv
232 * (or use the default argument if the option has been
233 * set and the argument hasn't been specified) and
234 * return a token corresponding to this string.
236 if (i < 0 || (i >= yypcb->pcb_sargc &&
237 !(yypcb->pcb_cflags & DTRACE_C_DEFARG))) {
238 xyerror(D_MACRO_UNDEF, "macro argument %s is "
239 "not defined\n", yytext);
242 if (i < yypcb->pcb_sargc) {
243 v = yypcb->pcb_sargv[i]; /* get val from pcb */
244 yypcb->pcb_sflagv[i] |= DT_IDFLG_REF;
248 * If the macro text is not a valid integer or ident,
249 * then we treat it as a string. The string may be
250 * optionally enclosed in quotes, which we strip.
252 if (strbadidnum(v)) {
253 size_t len = strlen(v);
255 if (len != 1 && *v == '"' && v[len - 1] == '"')
256 yylval.l_str = strndup(v + 1, len - 2);
258 yylval.l_str = strndup(v, len);
260 if (yylval.l_str == NULL)
261 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
263 (void) stresc2chr(yylval.l_str);
264 return (DT_TOK_STRING);
268 * If the macro text is not a string an begins with a
269 * digit or a +/- sign, process it as an integer token.
271 if (isdigit(v[0]) || v[0] == '-' || v[0] == '+') {
278 yylval.l_int = strtoull(v, &p, 0);
279 (void) strncpy(yyintsuffix, p,
280 sizeof (yyintsuffix));
281 yyintdecimal = *v != '0';
283 if (errno == ERANGE) {
284 xyerror(D_MACRO_OFLOW, "macro argument"
285 " %s constant %s results in integer"
286 " overflow\n", yytext, v);
292 return (id_or_type(v));
295 <S0>"$$"{RGX_IDENT} {
296 dt_ident_t *idp = dt_idhash_lookup(
297 yypcb->pcb_hdl->dt_macros, yytext + 2);
299 char s[16]; /* enough for UINT_MAX + \0 */
302 xyerror(D_MACRO_UNDEF, "macro variable %s "
303 "is not defined\n", yytext);
307 * For the moment, all current macro variables are of
308 * type id_t (refer to dtrace_update() for details).
310 (void) snprintf(s, sizeof (s), "%u", idp->di_id);
311 if ((yylval.l_str = strdup(s)) == NULL)
312 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
314 return (DT_TOK_STRING);
318 dt_ident_t *idp = dt_idhash_lookup(
319 yypcb->pcb_hdl->dt_macros, yytext + 1);
322 xyerror(D_MACRO_UNDEF, "macro variable %s "
323 "is not defined\n", yytext);
327 * For the moment, all current macro variables are of
328 * type id_t (refer to dtrace_update() for details).
330 yylval.l_int = (intmax_t)(int)idp->di_id;
332 yyintsuffix[0] = '\0';
339 return (id_or_type(yytext));
343 if ((yylval.l_str = strdup(yytext)) == NULL)
344 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
349 if ((yylval.l_str = strdup("@_")) == NULL)
350 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
360 yylval.l_int = strtoull(yytext, &p, 0);
362 (void) strncpy(yyintsuffix, p, sizeof (yyintsuffix));
363 yyintdecimal = yytext[0] != '0';
365 if (errno == ERANGE) {
366 xyerror(D_INT_OFLOW, "constant %s results in "
367 "integer overflow\n", yytext);
370 if (*p != '\0' && strchr("uUlL", *p) == NULL) {
371 xyerror(D_INT_DIGIT, "constant %s contains "
372 "invalid digit %c\n", yytext, *p);
378 yypragma = dt_node_link(yypragma,
379 dt_node_int(yylval.l_int));
382 <S0>{RGX_FP} yyerror("floating-point constants are not permitted\n");
385 <S3>\"{RGX_STR}$ xyerror(D_STR_NL, "newline encountered in string literal");
390 * Quoted string -- convert C escape sequences and
391 * return the string as a token.
393 yylval.l_str = strndup(yytext + 1, yyleng - 2);
395 if (yylval.l_str == NULL)
396 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
398 (void) stresc2chr(yylval.l_str);
400 return (DT_TOK_STRING);
402 yypragma = dt_node_link(yypragma,
403 dt_node_string(yylval.l_str));
406 <S0>'{RGX_CHR}$ xyerror(D_CHR_NL, "newline encountered in character constant");
413 * Character constant -- convert C escape sequences and
414 * return the character as an integer immediate value.
417 xyerror(D_CHR_NULL, "empty character constant");
420 yytext[yyleng - 1] = '\0';
421 nbytes = stresc2chr(s);
424 yyintsuffix[0] = '\0';
427 if (nbytes > sizeof (yylval.l_int)) {
428 xyerror(D_CHR_OFLOW, "character constant is "
431 #if BYTE_ORDER == _LITTLE_ENDIAN
432 p = ((char *)&yylval.l_int) + nbytes - 1;
433 for (q = s; nbytes != 0; nbytes--)
436 bcopy(s, ((char *)&yylval.l_int) +
437 sizeof (yylval.l_int) - nbytes, nbytes);
444 yypcb->pcb_cstate = (YYSTATE);
449 <S2>{RGX_INTERP} ; /* discard any #! lines */
454 assert(yypragma == NULL);
455 yypcb->pcb_cstate = (YYSTATE);
459 <S4>. ; /* discard */
460 <S4>"\n" ; /* discard */
466 * The use of "/" as the predicate delimiter and as the
467 * integer division symbol requires special lookahead
468 * to avoid a shift/reduce conflict in the D grammar.
469 * We look ahead to the next non-whitespace character.
470 * If we encounter EOF, ";", "{", or "/", then this "/"
471 * closes the predicate and we return DT_TOK_EPRED.
472 * If we encounter anything else, it's DT_TOK_DIV.
474 while ((c = input()) != 0) {
475 if (strchr("\f\n\r\t\v ", c) == NULL)
479 if (c == 0 || c == ';' || c == '{' || c == '/') {
480 if (yypcb->pcb_parens != 0) {
481 yyerror("closing ) expected in "
482 "predicate before /\n");
484 if (yypcb->pcb_brackets != 0) {
485 yyerror("closing ] expected in "
486 "predicate before /\n");
498 return (DT_TOK_LPAR);
502 if (--yypcb->pcb_parens < 0)
503 yyerror("extra ) in input stream\n");
504 return (DT_TOK_RPAR);
508 yypcb->pcb_brackets++;
509 return (DT_TOK_LBRAC);
513 if (--yypcb->pcb_brackets < 0)
514 yyerror("extra ] in input stream\n");
515 return (DT_TOK_RBRAC);
525 if (--yypcb->pcb_braces < 0)
526 yyerror("extra } in input stream\n");
530 <S0>"|" return (DT_TOK_BOR);
531 <S0>"^" return (DT_TOK_XOR);
532 <S0>"&" return (DT_TOK_BAND);
533 <S0>"&&" return (DT_TOK_LAND);
534 <S0>"^^" return (DT_TOK_LXOR);
535 <S0>"||" return (DT_TOK_LOR);
536 <S0>"==" return (DT_TOK_EQU);
537 <S0>"!=" return (DT_TOK_NEQ);
538 <S0>"<" return (DT_TOK_LT);
539 <S0>"<=" return (DT_TOK_LE);
540 <S0>">" return (DT_TOK_GT);
541 <S0>">=" return (DT_TOK_GE);
542 <S0>"<<" return (DT_TOK_LSH);
543 <S0>">>" return (DT_TOK_RSH);
544 <S0>"+" return (DT_TOK_ADD);
545 <S0>"-" return (DT_TOK_SUB);
546 <S0>"*" return (DT_TOK_MUL);
547 <S0>"%" return (DT_TOK_MOD);
548 <S0>"~" return (DT_TOK_BNEG);
549 <S0>"!" return (DT_TOK_LNEG);
550 <S0>"?" return (DT_TOK_QUESTION);
551 <S0>":" return (DT_TOK_COLON);
552 <S0>"." return (DT_TOK_DOT);
553 <S0>"->" return (DT_TOK_PTR);
554 <S0>"=" return (DT_TOK_ASGN);
555 <S0>"+=" return (DT_TOK_ADD_EQ);
556 <S0>"-=" return (DT_TOK_SUB_EQ);
557 <S0>"*=" return (DT_TOK_MUL_EQ);
558 <S0>"/=" return (DT_TOK_DIV_EQ);
559 <S0>"%=" return (DT_TOK_MOD_EQ);
560 <S0>"&=" return (DT_TOK_AND_EQ);
561 <S0>"^=" return (DT_TOK_XOR_EQ);
562 <S0>"|=" return (DT_TOK_OR_EQ);
563 <S0>"<<=" return (DT_TOK_LSH_EQ);
564 <S0>">>=" return (DT_TOK_RSH_EQ);
565 <S0>"++" return (DT_TOK_ADDADD);
566 <S0>"--" return (DT_TOK_SUBSUB);
567 <S0>"..." return (DT_TOK_ELLIPSIS);
568 <S0>"," return (DT_TOK_COMMA);
569 <S0>";" return (';');
570 <S0>{RGX_WS} ; /* discard */
571 <S0>"\\"\n ; /* discard */
572 <S0>. yyerror("syntax error near \"%c\"\n", yytext[0]);
574 <S1>"/*" yyerror("/* encountered inside a comment\n");
575 <S1>"*/" BEGIN(yypcb->pcb_cstate);
576 <S1>.|\n ; /* discard */
580 * S2 has an ambiguity because RGX_PSPEC includes '*'
581 * as a glob character and '*' also can be DT_TOK_STAR.
582 * Since lex always matches the longest token, this
583 * rule can be matched by an input string like "int*",
584 * which could begin a global variable declaration such
585 * as "int*x;" or could begin a RGX_PSPEC with globbing
586 * such as "int* { trace(timestamp); }". If C_PSPEC is
587 * not set, we must resolve the ambiguity in favor of
588 * the type and perform lexer pushback if the fragment
589 * before '*' or entire fragment matches a type name.
590 * If C_PSPEC is set, we always return a PSPEC token.
591 * If C_PSPEC is off, the user can avoid ambiguity by
592 * including a ':' delimiter in the specifier, which
593 * they should be doing anyway to specify the provider.
595 if (!(yypcb->pcb_cflags & DTRACE_C_PSPEC) &&
596 strchr(yytext, ':') == NULL) {
598 char *p = strchr(yytext, '*');
599 char *q = yytext + yyleng - 1;
601 if (p != NULL && p > yytext)
602 *p = '\0'; /* prune yytext */
604 if (dt_type_lookup(yytext, NULL) == 0) {
605 yylval.l_str = strdup(yytext);
607 if (yylval.l_str == NULL) {
608 longjmp(yypcb->pcb_jmpbuf,
612 if (p != NULL && p > yytext) {
613 for (*p = '*'; q >= p; q--)
618 return (DT_TOK_TNAME);
621 if (p != NULL && p > yytext)
622 *p = '*'; /* restore yytext */
625 if ((yylval.l_str = strdup(yytext)) == NULL)
626 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
628 return (DT_TOK_PSPEC);
631 <S2>"/" return (DT_TOK_DIV);
632 <S2>"," return (DT_TOK_COMMA);
634 <S2>{RGX_WS} ; /* discard */
635 <S2>. yyerror("syntax error near \"%c\"\n", yytext[0]);
640 BEGIN(yypcb->pcb_cstate);
643 <S3>[\f\t\v ]+ ; /* discard */
648 if ((yylval.l_str = strdup(yytext)) == NULL)
649 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
652 * We want to call dt_node_ident() here, but we can't
653 * because it will expand inlined identifiers, which we
654 * don't want to do from #pragma context in order to
655 * support pragmas that apply to the ident itself. We
656 * call dt_node_string() and then reset dn_op instead.
658 dnp = dt_node_string(yylval.l_str);
659 dnp->dn_kind = DT_NODE_IDENT;
660 dnp->dn_op = DT_TOK_IDENT;
661 yypragma = dt_node_link(yypragma, dnp);
664 <S3>. yyerror("syntax error near \"%c\"\n", yytext[0]);
669 * yybegin provides a wrapper for use from C code around the lex BEGIN() macro.
670 * We use two main states for lexing because probe descriptions use a syntax
671 * that is incompatible with the normal D tokens (e.g. names can contain "-").
672 * yybegin also handles the job of switching between two lists of dt_nodes
673 * as we allocate persistent definitions, like inlines, and transient nodes
674 * that will be freed once we are done parsing the current program file.
677 yybegin(yystate_t state)
680 yydebug = _dtrace_debug;
682 if (yypcb->pcb_yystate == state)
683 return; /* nothing to do if we're in the state already */
685 if (yypcb->pcb_yystate == YYS_DEFINE) {
686 yypcb->pcb_list = yypcb->pcb_hold;
687 yypcb->pcb_hold = NULL;
695 assert(yypcb->pcb_hold == NULL);
696 yypcb->pcb_hold = yypcb->pcb_list;
697 yypcb->pcb_list = NULL;
708 xyerror(D_UNKNOWN, "internal error -- bad yystate %d\n", state);
711 yypcb->pcb_yystate = state;
715 yyinit(dt_pcb_t *pcb)
726 * Given a lexeme 's' (typically yytext), set yylval and return an appropriate
727 * token to the parser indicating either an identifier or a typedef name.
728 * User-defined global variables always take precedence over types, but we do
729 * use some heuristics because D programs can look at an ever-changing set of
730 * kernel types and also can implicitly instantiate variables by assignment,
731 * unlike in C. The code here is ordered carefully as lookups are not cheap.
734 id_or_type(const char *s)
736 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
737 dt_decl_t *ddp = yypcb->pcb_dstack.ds_decl;
738 int c0, c1, ttok = DT_TOK_TNAME;
741 if ((s = yylval.l_str = strdup(s)) == NULL)
742 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
745 * If the lexeme is a global variable or likely identifier or *not* a
746 * type_name, then it is an identifier token.
748 if (dt_idstack_lookup(&yypcb->pcb_globals, s) != NULL ||
749 dt_idhash_lookup(yypcb->pcb_idents, s) != NULL ||
750 dt_type_lookup(s, NULL) != 0)
751 return (DT_TOK_IDENT);
754 * If we're in the midst of parsing a declaration and a type_specifier
755 * has already been shifted, then return DT_TOK_IDENT instead of TNAME.
756 * This semantic is necessary to permit valid ISO C code such as:
759 * struct s { foo foo; };
761 * without causing shift/reduce conflicts in the direct_declarator part
762 * of the grammar. The result is that we must check for conflicting
763 * redeclarations of the same identifier as part of dt_node_decl().
765 if (ddp != NULL && ddp->dd_name != NULL)
766 return (DT_TOK_IDENT);
769 * If the lexeme is a type name and we are not in a program clause,
770 * then always interpret it as a type and return DT_TOK_TNAME.
773 return (DT_TOK_TNAME);
776 * If the lexeme matches a type name but is in a program clause, then
777 * it could be a type or it could be an undefined variable. Peek at
778 * the next token to decide. If we see ++, --, [, or =, we know there
779 * might be an assignment that is trying to create a global variable,
780 * so we optimistically return DT_TOK_IDENT. There is no harm in being
781 * wrong: a type_name followed by ++, --, [, or = is a syntax error.
783 while ((c0 = input()) != 0) {
784 if (strchr("\f\n\r\t\v ", c0) == NULL)
791 if ((c1 = input()) == c0)
797 if ((c1 = input()) != c0)
806 if (ttok == DT_TOK_IDENT) {
807 idp = dt_idhash_insert(yypcb->pcb_idents, s, DT_IDENT_SCALAR, 0,
808 0, _dtrace_defattr, 0, &dt_idops_thaw, NULL, dtp->dt_gen);
811 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
826 else if (yypcb->pcb_fileptr != NULL)
827 c = fgetc(yypcb->pcb_fileptr);
828 else if (yypcb->pcb_strptr < yypcb->pcb_string + yypcb->pcb_strlen)
829 c = *yypcb->pcb_strptr++;
840 yyerror("end-of-file encountered before matching */\n");
843 yyerror("end-of-file encountered before end of control line\n");
845 if (yypcb->pcb_fileptr != NULL && ferror(yypcb->pcb_fileptr))
846 longjmp(yypcb->pcb_jmpbuf, EDT_FIO);
848 return (0); /* EOF */