1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
25 * Copyright 2020 Joyent, Inc.
26 */
27
28 #include <strings.h>
29 #include <stdlib.h>
30 #include <limits.h>
31 #include <alloca.h>
32 #include <assert.h>
33
34 #include <dt_decl.h>
35 #include <dt_parser.h>
36 #include <dt_module.h>
37 #include <dt_impl.h>
38
39 static dt_decl_t *
dt_decl_check(dt_decl_t * ddp)40 dt_decl_check(dt_decl_t *ddp)
41 {
42 if (ddp->dd_kind == CTF_K_UNKNOWN)
43 return (ddp); /* nothing to check if the type is not yet set */
44
45 if (ddp->dd_name != NULL && strcmp(ddp->dd_name, "char") == 0 &&
46 (ddp->dd_attr & (DT_DA_SHORT | DT_DA_LONG | DT_DA_LONGLONG))) {
47 xyerror(D_DECL_CHARATTR, "invalid type declaration: short and "
48 "long may not be used with char type\n");
49 }
50
51 if (ddp->dd_name != NULL && strcmp(ddp->dd_name, "void") == 0 &&
52 (ddp->dd_attr & (DT_DA_SHORT | DT_DA_LONG | DT_DA_LONGLONG |
53 (DT_DA_SIGNED | DT_DA_UNSIGNED)))) {
54 xyerror(D_DECL_VOIDATTR, "invalid type declaration: attributes "
55 "may not be used with void type\n");
56 }
57
58 if (ddp->dd_kind != CTF_K_INTEGER &&
59 (ddp->dd_attr & (DT_DA_SIGNED | DT_DA_UNSIGNED))) {
60 xyerror(D_DECL_SIGNINT, "invalid type declaration: signed and "
61 "unsigned may only be used with integer type\n");
62 }
63
64 if (ddp->dd_kind != CTF_K_INTEGER && ddp->dd_kind != CTF_K_FLOAT &&
65 (ddp->dd_attr & (DT_DA_LONG | DT_DA_LONGLONG))) {
66 xyerror(D_DECL_LONGINT, "invalid type declaration: long and "
67 "long long may only be used with integer or "
68 "floating-point type\n");
69 }
70
71 return (ddp);
72 }
73
74 dt_decl_t *
dt_decl_alloc(ushort_t kind,char * name)75 dt_decl_alloc(ushort_t kind, char *name)
76 {
77 dt_decl_t *ddp = malloc(sizeof (dt_decl_t));
78
79 if (ddp == NULL)
80 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
81
82 ddp->dd_kind = kind;
83 ddp->dd_attr = 0;
84 ddp->dd_ctfp = NULL;
85 ddp->dd_type = CTF_ERR;
86 ddp->dd_name = name;
87 ddp->dd_node = NULL;
88 ddp->dd_next = NULL;
89
90 return (ddp);
91 }
92
93 void
dt_decl_free(dt_decl_t * ddp)94 dt_decl_free(dt_decl_t *ddp)
95 {
96 dt_decl_t *ndp;
97
98 for (; ddp != NULL; ddp = ndp) {
99 ndp = ddp->dd_next;
100 free(ddp->dd_name);
101 dt_node_list_free(&ddp->dd_node);
102 free(ddp);
103 }
104 }
105
106 void
dt_decl_reset(void)107 dt_decl_reset(void)
108 {
109 dt_scope_t *dsp = &yypcb->pcb_dstack;
110 dt_decl_t *ddp = dsp->ds_decl;
111
112 while (ddp->dd_next != NULL) {
113 dsp->ds_decl = ddp->dd_next;
114 ddp->dd_next = NULL;
115 dt_decl_free(ddp);
116 ddp = dsp->ds_decl;
117 }
118 }
119
120 dt_decl_t *
dt_decl_push(dt_decl_t * ddp)121 dt_decl_push(dt_decl_t *ddp)
122 {
123 dt_scope_t *dsp = &yypcb->pcb_dstack;
124 dt_decl_t *top = dsp->ds_decl;
125
126 if (top != NULL &&
127 top->dd_kind == CTF_K_UNKNOWN && top->dd_name == NULL) {
128 top->dd_kind = CTF_K_INTEGER;
129 (void) dt_decl_check(top);
130 }
131
132 assert(ddp->dd_next == NULL);
133 ddp->dd_next = top;
134 dsp->ds_decl = ddp;
135
136 return (ddp);
137 }
138
139 dt_decl_t *
dt_decl_pop(void)140 dt_decl_pop(void)
141 {
142 dt_scope_t *dsp = &yypcb->pcb_dstack;
143 dt_decl_t *ddp = dt_decl_top();
144
145 dsp->ds_decl = NULL;
146 free(dsp->ds_ident);
147 dsp->ds_ident = NULL;
148 dsp->ds_ctfp = NULL;
149 dsp->ds_type = CTF_ERR;
150 dsp->ds_class = DT_DC_DEFAULT;
151 dsp->ds_enumval = -1;
152
153 return (ddp);
154 }
155
156 dt_decl_t *
dt_decl_pop_param(char ** idp)157 dt_decl_pop_param(char **idp)
158 {
159 dt_scope_t *dsp = &yypcb->pcb_dstack;
160
161 if (dsp->ds_class != DT_DC_DEFAULT && dsp->ds_class != DT_DC_REGISTER) {
162 xyerror(D_DECL_PARMCLASS, "inappropriate storage class "
163 "for function or associative array parameter\n");
164 }
165
166 if (idp != NULL && dt_decl_top() != NULL) {
167 *idp = dsp->ds_ident;
168 dsp->ds_ident = NULL;
169 }
170
171 return (dt_decl_pop());
172 }
173
174 dt_decl_t *
dt_decl_top(void)175 dt_decl_top(void)
176 {
177 dt_decl_t *ddp = yypcb->pcb_dstack.ds_decl;
178
179 if (ddp == NULL)
180 longjmp(yypcb->pcb_jmpbuf, EDT_NODECL);
181
182 if (ddp->dd_kind == CTF_K_UNKNOWN && ddp->dd_name == NULL) {
183 ddp->dd_kind = CTF_K_INTEGER;
184 (void) dt_decl_check(ddp);
185 }
186
187 return (ddp);
188 }
189
190 dt_decl_t *
dt_decl_ident(char * name)191 dt_decl_ident(char *name)
192 {
193 dt_scope_t *dsp = &yypcb->pcb_dstack;
194 dt_decl_t *ddp = dsp->ds_decl;
195
196 if (dsp->ds_ident != NULL) {
197 free(name);
198 xyerror(D_DECL_IDENT, "old-style declaration or "
199 "incorrect type specified\n");
200 }
201
202 dsp->ds_ident = name;
203
204 if (ddp == NULL)
205 ddp = dt_decl_push(dt_decl_alloc(CTF_K_UNKNOWN, NULL));
206
207 return (ddp);
208 }
209
210 void
dt_decl_class(dt_dclass_t class)211 dt_decl_class(dt_dclass_t class)
212 {
213 dt_scope_t *dsp = &yypcb->pcb_dstack;
214
215 if (dsp->ds_class != DT_DC_DEFAULT) {
216 xyerror(D_DECL_CLASS, "only one storage class allowed "
217 "in a declaration\n");
218 }
219
220 dsp->ds_class = class;
221 }
222
223 /*
224 * Set the kind and name of the current declaration. If none is allocated,
225 * make a new decl and push it on to the top of our stack. If the name or kind
226 * is already set for the current decl, then we need to fail this declaration.
227 * This can occur because too many types were given (e.g. "int int"), etc.
228 */
229 dt_decl_t *
dt_decl_spec(ushort_t kind,char * name)230 dt_decl_spec(ushort_t kind, char *name)
231 {
232 dt_decl_t *ddp = yypcb->pcb_dstack.ds_decl;
233
234 if (ddp == NULL)
235 return (dt_decl_push(dt_decl_alloc(kind, name)));
236
237 /*
238 * If we already have a type name specified and we see another type
239 * name, this is an error if the declaration is a typedef. If the
240 * declaration is not a typedef, then the user may be trying to declare
241 * a variable whose name has been returned by lex as a TNAME token:
242 * call dt_decl_ident() as if the grammar's IDENT rule was matched.
243 */
244 if (ddp->dd_name != NULL && kind == CTF_K_TYPEDEF) {
245 if (yypcb->pcb_dstack.ds_class != DT_DC_TYPEDEF)
246 return (dt_decl_ident(name));
247 xyerror(D_DECL_IDRED, "identifier redeclared: %s\n", name);
248 }
249
250 if (ddp->dd_name != NULL || ddp->dd_kind != CTF_K_UNKNOWN)
251 xyerror(D_DECL_COMBO, "invalid type combination\n");
252
253 ddp->dd_kind = kind;
254 ddp->dd_name = name;
255
256 return (dt_decl_check(ddp));
257 }
258
259 dt_decl_t *
dt_decl_attr(ushort_t attr)260 dt_decl_attr(ushort_t attr)
261 {
262 dt_decl_t *ddp = yypcb->pcb_dstack.ds_decl;
263
264 if (ddp == NULL) {
265 ddp = dt_decl_push(dt_decl_alloc(CTF_K_UNKNOWN, NULL));
266 ddp->dd_attr = attr;
267 return (ddp);
268 }
269
270 if ((attr & DT_DA_LONG) && (ddp->dd_attr & DT_DA_LONGLONG)) {
271 xyerror(D_DECL_COMBO, "the attribute 'long' may only "
272 "be used at most twice in a declaration");
273 }
274
275 if ((attr & DT_DA_SHORT) && (ddp->dd_attr & DT_DA_SHORT)) {
276 xyerror(D_DECL_COMBO, "the attribute 'short' may only be "
277 "used at most once in a declaration");
278 }
279
280 if ((attr & DT_DA_SIGNED) && (ddp->dd_attr & DT_DA_SIGNED)) {
281 xyerror(D_DECL_COMBO, "the attribute 'signed' may only be "
282 "used at most once in a declaration");
283 }
284
285 if ((attr & DT_DA_UNSIGNED) && (ddp->dd_attr & DT_DA_UNSIGNED)) {
286 xyerror(D_DECL_COMBO, "the attribute 'unsigned' may only be "
287 "used at most once in a declaration");
288 }
289
290 if (attr == DT_DA_LONG && (ddp->dd_attr & DT_DA_LONG)) {
291 ddp->dd_attr &= ~DT_DA_LONG;
292 attr = DT_DA_LONGLONG;
293 }
294
295 ddp->dd_attr |= attr;
296 return (dt_decl_check(ddp));
297 }
298
299 /*
300 * Examine the list of formal parameters 'flist' and determine if the formal
301 * name fnp->dn_string is defined in this list (B_TRUE) or not (B_FALSE).
302 * If 'fnp' is in 'flist', do not search beyond 'fnp' itself in 'flist'.
303 */
304 static int
dt_decl_protoform(dt_node_t * fnp,dt_node_t * flist)305 dt_decl_protoform(dt_node_t *fnp, dt_node_t *flist)
306 {
307 dt_node_t *dnp;
308
309 for (dnp = flist; dnp != fnp && dnp != NULL; dnp = dnp->dn_list) {
310 if (dnp->dn_string != NULL &&
311 strcmp(dnp->dn_string, fnp->dn_string) == 0)
312 return (B_TRUE);
313 }
314
315 return (B_FALSE);
316 }
317
318 /*
319 * Common code for parsing array, function, and probe definition prototypes.
320 * The prototype node list is specified as 'plist'. The formal prototype
321 * against which to compare the prototype is specified as 'flist'. If plist
322 * and flist are the same, we require that named parameters are unique. If
323 * plist and flist are different, we require that named parameters in plist
324 * match a name that is present in flist.
325 */
326 int
dt_decl_prototype(dt_node_t * plist,dt_node_t * flist,const char * kind,uint_t flags)327 dt_decl_prototype(dt_node_t *plist,
328 dt_node_t *flist, const char *kind, uint_t flags)
329 {
330 char n[DT_TYPE_NAMELEN];
331 int is_void, v = 0, i = 1;
332 int form = plist != flist;
333 dt_node_t *dnp;
334
335 for (dnp = plist; dnp != NULL; dnp = dnp->dn_list, i++) {
336
337 if (dnp->dn_type == CTF_ERR && !(flags & DT_DP_VARARGS)) {
338 dnerror(dnp, D_DECL_PROTO_VARARGS, "%s prototype may "
339 "not use a variable-length argument list\n", kind);
340 }
341
342 if (dt_node_is_dynamic(dnp) && !(flags & DT_DP_DYNAMIC)) {
343 dnerror(dnp, D_DECL_PROTO_TYPE, "%s prototype may not "
344 "use parameter of type %s: %s, parameter #%d\n",
345 kind, dt_node_type_name(dnp, n, sizeof (n)),
346 dnp->dn_string ? dnp->dn_string : "(anonymous)", i);
347 }
348
349 is_void = dt_node_is_void(dnp);
350 v += is_void;
351
352 if (is_void && !(flags & DT_DP_VOID)) {
353 dnerror(dnp, D_DECL_PROTO_TYPE, "%s prototype may not "
354 "use parameter of type %s: %s, parameter #%d\n",
355 kind, dt_node_type_name(dnp, n, sizeof (n)),
356 dnp->dn_string ? dnp->dn_string : "(anonymous)", i);
357 }
358
359 if (is_void && dnp->dn_string != NULL) {
360 dnerror(dnp, D_DECL_PROTO_NAME, "void parameter may "
361 "not have a name: %s\n", dnp->dn_string);
362 }
363
364 if (dnp->dn_string != NULL &&
365 dt_decl_protoform(dnp, flist) != form) {
366 dnerror(dnp, D_DECL_PROTO_FORM, "parameter is "
367 "%s declared in %s prototype: %s, parameter #%d\n",
368 form ? "not" : "already", kind, dnp->dn_string, i);
369 }
370
371 if (dnp->dn_string == NULL &&
372 !is_void && !(flags & DT_DP_ANON)) {
373 dnerror(dnp, D_DECL_PROTO_NAME, "parameter declaration "
374 "requires a name: parameter #%d\n", i);
375 }
376 }
377
378 if (v != 0 && plist->dn_list != NULL)
379 xyerror(D_DECL_PROTO_VOID, "void must be sole parameter\n");
380
381 return (v ? 0 : i - 1); /* return zero if sole parameter is 'void' */
382 }
383
384 dt_decl_t *
dt_decl_array(dt_node_t * dnp)385 dt_decl_array(dt_node_t *dnp)
386 {
387 dt_decl_t *ddp = dt_decl_push(dt_decl_alloc(CTF_K_ARRAY, NULL));
388 dt_scope_t *dsp = &yypcb->pcb_dstack;
389 dt_decl_t *ndp = ddp;
390
391 /*
392 * After pushing the array on to the decl stack, scan ahead for multi-
393 * dimensional array declarations and push the current decl to the
394 * bottom to match the resulting CTF type tree and data layout. Refer
395 * to the comments in dt_decl_type() and ISO C 6.5.2.1 for more info.
396 */
397 while (ndp->dd_next != NULL && ndp->dd_next->dd_kind == CTF_K_ARRAY)
398 ndp = ndp->dd_next; /* skip to bottom-most array declaration */
399
400 if (ndp != ddp) {
401 if (dnp != NULL && dnp->dn_kind == DT_NODE_TYPE) {
402 xyerror(D_DECL_DYNOBJ,
403 "cannot declare array of associative arrays\n");
404 }
405 dsp->ds_decl = ddp->dd_next;
406 ddp->dd_next = ndp->dd_next;
407 ndp->dd_next = ddp;
408 }
409
410 if (ddp->dd_next->dd_name != NULL &&
411 strcmp(ddp->dd_next->dd_name, "void") == 0)
412 xyerror(D_DECL_VOIDOBJ, "cannot declare array of void\n");
413
414 if (dnp != NULL && dnp->dn_kind != DT_NODE_TYPE) {
415 dnp = ddp->dd_node = dt_node_cook(dnp, DT_IDFLG_REF);
416
417 if (dt_node_is_posconst(dnp) == 0) {
418 xyerror(D_DECL_ARRSUB, "positive integral constant "
419 "expression or tuple signature expected as "
420 "array declaration subscript\n");
421 }
422
423 if (dnp->dn_value > UINT_MAX)
424 xyerror(D_DECL_ARRBIG, "array dimension too big\n");
425
426 } else if (dnp != NULL) {
427 ddp->dd_node = dnp;
428 (void) dt_decl_prototype(dnp, dnp, "array", DT_DP_ANON);
429 }
430
431 return (ddp);
432 }
433
434 /*
435 * When a function is declared, we need to fudge the decl stack a bit if the
436 * declaration uses the function pointer (*)() syntax. In this case, the
437 * dt_decl_func() call occurs *after* the dt_decl_ptr() call, even though the
438 * resulting type is "pointer to function". To make the pointer land on top,
439 * we check to see if 'pdp' is non-NULL and a pointer. If it is, we search
440 * backward for a decl tagged with DT_DA_PAREN, and if one is found, the func
441 * decl is inserted behind this node in the decl list instead of at the top.
442 * In all cases, the func decl's dd_next pointer is set to the decl chain
443 * for the function's return type and the function parameter list is discarded.
444 */
445 dt_decl_t *
dt_decl_func(dt_decl_t * pdp,dt_node_t * dnp)446 dt_decl_func(dt_decl_t *pdp, dt_node_t *dnp)
447 {
448 dt_decl_t *ddp = dt_decl_alloc(CTF_K_FUNCTION, NULL);
449
450 ddp->dd_node = dnp;
451
452 (void) dt_decl_prototype(dnp, dnp, "function",
453 DT_DP_VARARGS | DT_DP_VOID | DT_DP_ANON);
454
455 if (pdp == NULL || pdp->dd_kind != CTF_K_POINTER)
456 return (dt_decl_push(ddp));
457
458 while (pdp->dd_next != NULL && !(pdp->dd_next->dd_attr & DT_DA_PAREN))
459 pdp = pdp->dd_next;
460
461 if (pdp->dd_next == NULL)
462 return (dt_decl_push(ddp));
463
464 ddp->dd_next = pdp->dd_next;
465 pdp->dd_next = ddp;
466
467 return (pdp);
468 }
469
470 dt_decl_t *
dt_decl_ptr(void)471 dt_decl_ptr(void)
472 {
473 return (dt_decl_push(dt_decl_alloc(CTF_K_POINTER, NULL)));
474 }
475
476 dt_decl_t *
dt_decl_sou(uint_t kind,char * name)477 dt_decl_sou(uint_t kind, char *name)
478 {
479 dt_decl_t *ddp = dt_decl_spec(kind, name);
480 char n[DT_TYPE_NAMELEN];
481 ctf_file_t *ctfp;
482 ctf_id_t type;
483 uint_t flag;
484
485 if (yypcb->pcb_idepth != 0)
486 ctfp = yypcb->pcb_hdl->dt_cdefs->dm_ctfp;
487 else
488 ctfp = yypcb->pcb_hdl->dt_ddefs->dm_ctfp;
489
490 if (yypcb->pcb_dstack.ds_next != NULL)
491 flag = CTF_ADD_NONROOT;
492 else
493 flag = CTF_ADD_ROOT;
494
495 (void) snprintf(n, sizeof (n), "%s %s",
496 kind == CTF_K_STRUCT ? "struct" : "union",
497 name == NULL ? "(anon)" : name);
498
499 if (name != NULL && (type = ctf_lookup_by_name(ctfp, n)) != CTF_ERR &&
500 ctf_type_kind(ctfp, type) != CTF_K_FORWARD)
501 xyerror(D_DECL_TYPERED, "type redeclared: %s\n", n);
502
503 if (kind == CTF_K_STRUCT)
504 type = ctf_add_struct(ctfp, flag, name);
505 else
506 type = ctf_add_union(ctfp, flag, name);
507
508 if (type == CTF_ERR || ctf_update(ctfp) == CTF_ERR) {
509 xyerror(D_UNKNOWN, "failed to define %s: %s\n",
510 n, ctf_errmsg(ctf_errno(ctfp)));
511 }
512
513 ddp->dd_ctfp = ctfp;
514 ddp->dd_type = type;
515
516 dt_scope_push(ctfp, type);
517 return (ddp);
518 }
519
520 void
dt_decl_member(dt_node_t * dnp)521 dt_decl_member(dt_node_t *dnp)
522 {
523 dt_scope_t *dsp = yypcb->pcb_dstack.ds_next;
524 dt_decl_t *ddp = yypcb->pcb_dstack.ds_decl;
525 char *ident = yypcb->pcb_dstack.ds_ident;
526
527 const char *idname = ident ? ident : "(anon)";
528 char n[DT_TYPE_NAMELEN];
529
530 dtrace_typeinfo_t dtt;
531 ctf_encoding_t cte;
532 ctf_id_t base;
533 uint_t kind;
534 ssize_t size;
535
536 if (dsp == NULL)
537 longjmp(yypcb->pcb_jmpbuf, EDT_NOSCOPE);
538
539 if (ddp == NULL)
540 longjmp(yypcb->pcb_jmpbuf, EDT_NODECL);
541
542 if (dnp == NULL && ident == NULL)
543 xyerror(D_DECL_MNAME, "member declaration requires a name\n");
544
545 if (ddp->dd_kind == CTF_K_UNKNOWN && ddp->dd_name == NULL) {
546 ddp->dd_kind = CTF_K_INTEGER;
547 (void) dt_decl_check(ddp);
548 }
549
550 if (dt_decl_type(ddp, &dtt) != 0)
551 longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
552
553 if (ident != NULL && strchr(ident, '`') != NULL) {
554 xyerror(D_DECL_SCOPE, "D scoping operator may not be used "
555 "in a member name (%s)\n", ident);
556 }
557
558 if (dtt.dtt_ctfp == DT_DYN_CTFP(yypcb->pcb_hdl) &&
559 dtt.dtt_type == DT_DYN_TYPE(yypcb->pcb_hdl)) {
560 xyerror(D_DECL_DYNOBJ,
561 "cannot have dynamic member: %s\n", ident);
562 }
563
564 base = ctf_type_resolve(dtt.dtt_ctfp, dtt.dtt_type);
565 kind = ctf_type_kind(dtt.dtt_ctfp, base);
566 size = ctf_type_size(dtt.dtt_ctfp, base);
567
568 if (kind == CTF_K_FORWARD || ((kind == CTF_K_STRUCT ||
569 kind == CTF_K_UNION) && size == 0)) {
570 xyerror(D_DECL_INCOMPLETE, "incomplete struct/union/enum %s: "
571 "%s\n", dt_type_name(dtt.dtt_ctfp, dtt.dtt_type,
572 n, sizeof (n)), ident);
573 }
574
575 if (size == 0) {
576 dt_decl_t *pdp;
577 dtrace_typeinfo_t pdt;
578 ctf_id_t pbase;
579 uint_t pkind;
580
581 pdp = dsp->ds_decl;
582 if (pdp == NULL)
583 longjmp(yypcb->pcb_jmpbuf, EDT_NODECL);
584 if (dt_decl_type(pdp, &pdt) != 0)
585 longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
586
587 pbase = ctf_type_resolve(pdt.dtt_ctfp, pdt.dtt_type);
588 pkind = ctf_type_kind(pdt.dtt_ctfp, pbase);
589
590 /*
591 * Last member of structure may be flexible array.
592 * Please note, here we actually do allow any array
593 * in structure to have size 0, this is because
594 * the structure declaration is still incomplete.
595 */
596 if (pkind != CTF_K_STRUCT || kind != CTF_K_ARRAY)
597 xyerror(D_DECL_VOIDOBJ,
598 "cannot have void member: %s\n", ident);
599 }
600
601 /*
602 * If a bit-field qualifier was part of the member declaration, create
603 * a new integer type of the same name and attributes as the base type
604 * and size equal to the specified number of bits. We reset 'dtt' to
605 * refer to this new bit-field type and continue on to add the member.
606 */
607 if (dnp != NULL) {
608 dnp = dt_node_cook(dnp, DT_IDFLG_REF);
609
610 /*
611 * A bit-field member with no declarator is permitted to have
612 * size zero and indicates that no more fields are to be packed
613 * into the current storage unit. We ignore these directives
614 * as the underlying ctf code currently does so for all fields.
615 */
616 if (ident == NULL && dnp->dn_kind == DT_NODE_INT &&
617 dnp->dn_value == 0) {
618 dt_node_free(dnp);
619 goto done;
620 }
621
622 if (dt_node_is_posconst(dnp) == 0) {
623 xyerror(D_DECL_BFCONST, "positive integral constant "
624 "expression expected as bit-field size\n");
625 }
626
627 if (ctf_type_kind(dtt.dtt_ctfp, base) != CTF_K_INTEGER ||
628 ctf_type_encoding(dtt.dtt_ctfp, base, &cte) == CTF_ERR ||
629 IS_VOID(cte)) {
630 xyerror(D_DECL_BFTYPE, "invalid type for "
631 "bit-field: %s\n", idname);
632 }
633
634 if (dnp->dn_value > cte.cte_bits) {
635 xyerror(D_DECL_BFSIZE, "bit-field too big "
636 "for type: %s\n", idname);
637 }
638
639 cte.cte_offset = 0;
640 cte.cte_bits = (uint_t)dnp->dn_value;
641
642 dtt.dtt_type = ctf_add_integer(dsp->ds_ctfp,
643 CTF_ADD_NONROOT, ctf_type_name(dtt.dtt_ctfp,
644 dtt.dtt_type, n, sizeof (n)), &cte);
645
646 if (dtt.dtt_type == CTF_ERR ||
647 ctf_update(dsp->ds_ctfp) == CTF_ERR) {
648 xyerror(D_UNKNOWN, "failed to create type for "
649 "member '%s': %s\n", idname,
650 ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
651 }
652
653 dtt.dtt_ctfp = dsp->ds_ctfp;
654 dt_node_free(dnp);
655 }
656
657 /*
658 * If the member type is not defined in the same CTF container as the
659 * one associated with the current scope (i.e. the container for the
660 * struct or union itself) or its parent, copy the member type into
661 * this container and reset dtt to refer to the copied type.
662 */
663 if (dtt.dtt_ctfp != dsp->ds_ctfp &&
664 dtt.dtt_ctfp != ctf_parent_file(dsp->ds_ctfp)) {
665
666 dtt.dtt_type = ctf_add_type(dsp->ds_ctfp,
667 dtt.dtt_ctfp, dtt.dtt_type);
668 dtt.dtt_ctfp = dsp->ds_ctfp;
669
670 if (dtt.dtt_type == CTF_ERR ||
671 ctf_update(dtt.dtt_ctfp) == CTF_ERR) {
672 xyerror(D_UNKNOWN, "failed to copy type of '%s': %s\n",
673 idname, ctf_errmsg(ctf_errno(dtt.dtt_ctfp)));
674 }
675 }
676
677 if (ctf_add_member(dsp->ds_ctfp, dsp->ds_type,
678 ident, dtt.dtt_type, ULONG_MAX) == CTF_ERR) {
679 xyerror(D_UNKNOWN, "failed to define member '%s': %s\n",
680 idname, ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
681 }
682
683 done:
684 free(ident);
685 yypcb->pcb_dstack.ds_ident = NULL;
686 dt_decl_reset();
687 }
688
689 /*ARGSUSED*/
690 static int
dt_decl_hasmembers(const char * name,int value,void * private)691 dt_decl_hasmembers(const char *name, int value, void *private)
692 {
693 return (1); /* abort search and return true if a member exists */
694 }
695
696 dt_decl_t *
dt_decl_enum(char * name)697 dt_decl_enum(char *name)
698 {
699 dt_decl_t *ddp = dt_decl_spec(CTF_K_ENUM, name);
700 char n[DT_TYPE_NAMELEN];
701 ctf_file_t *ctfp;
702 ctf_id_t type;
703 uint_t flag;
704
705 if (yypcb->pcb_idepth != 0)
706 ctfp = yypcb->pcb_hdl->dt_cdefs->dm_ctfp;
707 else
708 ctfp = yypcb->pcb_hdl->dt_ddefs->dm_ctfp;
709
710 if (yypcb->pcb_dstack.ds_next != NULL)
711 flag = CTF_ADD_NONROOT;
712 else
713 flag = CTF_ADD_ROOT;
714
715 (void) snprintf(n, sizeof (n), "enum %s", name ? name : "(anon)");
716
717 if (name != NULL && (type = ctf_lookup_by_name(ctfp, n)) != CTF_ERR) {
718 if (ctf_enum_iter(ctfp, type, dt_decl_hasmembers, NULL))
719 xyerror(D_DECL_TYPERED, "type redeclared: %s\n", n);
720 } else if ((type = ctf_add_enum(ctfp, flag, name, 0)) == CTF_ERR) {
721 xyerror(D_UNKNOWN, "failed to define %s: %s\n",
722 n, ctf_errmsg(ctf_errno(ctfp)));
723 }
724
725 ddp->dd_ctfp = ctfp;
726 ddp->dd_type = type;
727
728 dt_scope_push(ctfp, type);
729 return (ddp);
730 }
731
732 void
dt_decl_enumerator(char * s,dt_node_t * dnp)733 dt_decl_enumerator(char *s, dt_node_t *dnp)
734 {
735 dt_scope_t *dsp = yypcb->pcb_dstack.ds_next;
736 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
737
738 dt_idnode_t *inp;
739 dt_ident_t *idp;
740 char *name;
741 int value;
742
743 name = strdupa(s);
744 free(s);
745
746 if (dsp == NULL)
747 longjmp(yypcb->pcb_jmpbuf, EDT_NOSCOPE);
748
749 assert(dsp->ds_decl->dd_kind == CTF_K_ENUM);
750 value = dsp->ds_enumval + 1; /* default is previous value plus one */
751
752 if (strchr(name, '`') != NULL) {
753 xyerror(D_DECL_SCOPE, "D scoping operator may not be used in "
754 "an enumerator name (%s)\n", name);
755 }
756
757 /*
758 * If the enumerator is being assigned a value, cook and check the node
759 * and then free it after we get the value. We also permit references
760 * to identifiers which are previously defined enumerators in the type.
761 */
762 if (dnp != NULL) {
763 if (dnp->dn_kind != DT_NODE_IDENT || ctf_enum_value(
764 dsp->ds_ctfp, dsp->ds_type, dnp->dn_string, &value) != 0) {
765 dnp = dt_node_cook(dnp, DT_IDFLG_REF);
766
767 if (dnp->dn_kind != DT_NODE_INT) {
768 xyerror(D_DECL_ENCONST, "enumerator '%s' must "
769 "be assigned to an integral constant "
770 "expression\n", name);
771 }
772
773 if ((intmax_t)dnp->dn_value > INT_MAX ||
774 (intmax_t)dnp->dn_value < INT_MIN) {
775 xyerror(D_DECL_ENOFLOW, "enumerator '%s' value "
776 "overflows INT_MAX (%d)\n", name, INT_MAX);
777 }
778
779 value = (int)dnp->dn_value;
780 }
781 dt_node_free(dnp);
782 }
783
784 if (ctf_add_enumerator(dsp->ds_ctfp, dsp->ds_type,
785 name, value) == CTF_ERR || ctf_update(dsp->ds_ctfp) == CTF_ERR) {
786 xyerror(D_UNKNOWN, "failed to define enumerator '%s': %s\n",
787 name, ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
788 }
789
790 dsp->ds_enumval = value; /* save most recent value */
791
792 /*
793 * If the enumerator name matches an identifier in the global scope,
794 * flag this as an error. We only do this for "D" enumerators to
795 * prevent "C" header file enumerators from conflicting with the ever-
796 * growing list of D built-in global variables and inlines. If a "C"
797 * enumerator conflicts with a global identifier, we add the enumerator
798 * but do not insert a corresponding inline (i.e. the D variable wins).
799 */
800 if (dt_idstack_lookup(&yypcb->pcb_globals, name) != NULL) {
801 if (dsp->ds_ctfp == dtp->dt_ddefs->dm_ctfp) {
802 xyerror(D_DECL_IDRED,
803 "identifier redeclared: %s\n", name);
804 } else
805 return;
806 }
807
808 dt_dprintf("add global enumerator %s = %d\n", name, value);
809
810 idp = dt_idhash_insert(dtp->dt_globals, name, DT_IDENT_ENUM,
811 DT_IDFLG_INLINE | DT_IDFLG_REF, 0, _dtrace_defattr, 0,
812 &dt_idops_inline, NULL, dtp->dt_gen);
813
814 if (idp == NULL)
815 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
816
817 yyintprefix = 0;
818 yyintsuffix[0] = '\0';
819 yyintdecimal = 0;
820
821 dnp = dt_node_int(value);
822 dt_node_type_assign(dnp, dsp->ds_ctfp, dsp->ds_type, B_FALSE);
823
824 if ((inp = malloc(sizeof (dt_idnode_t))) == NULL)
825 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
826
827 /*
828 * Remove the INT node from the node allocation list and store it in
829 * din_list and din_root so it persists with and is freed by the ident.
830 */
831 assert(yypcb->pcb_list == dnp);
832 yypcb->pcb_list = dnp->dn_link;
833 dnp->dn_link = NULL;
834
835 bzero(inp, sizeof (dt_idnode_t));
836 inp->din_list = dnp;
837 inp->din_root = dnp;
838
839 idp->di_iarg = inp;
840 idp->di_ctfp = dsp->ds_ctfp;
841 idp->di_type = dsp->ds_type;
842 }
843
844 /*
845 * Look up the type corresponding to the specified decl stack. The scoping of
846 * the underlying type names is handled by dt_type_lookup(). We build up the
847 * name from the specified string and prefixes and then lookup the type. If
848 * we fail, an errmsg is saved and the caller must abort with EDT_COMPILER.
849 */
850 int
dt_decl_type(dt_decl_t * ddp,dtrace_typeinfo_t * tip)851 dt_decl_type(dt_decl_t *ddp, dtrace_typeinfo_t *tip)
852 {
853 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
854
855 dt_module_t *dmp;
856 ctf_arinfo_t r;
857 ctf_id_t type;
858
859 char n[DT_TYPE_NAMELEN];
860 uint_t flag;
861 char *name;
862 int rv;
863
864 tip->dtt_flags = 0;
865
866 /*
867 * Based on our current #include depth and decl stack depth, determine
868 * which dynamic CTF module and scope to use when adding any new types.
869 */
870 dmp = yypcb->pcb_idepth ? dtp->dt_cdefs : dtp->dt_ddefs;
871 flag = yypcb->pcb_dstack.ds_next ? CTF_ADD_NONROOT : CTF_ADD_ROOT;
872
873 if (ddp->dd_attr & DT_DA_USER)
874 tip->dtt_flags = DTT_FL_USER;
875
876 /*
877 * If we have already cached a CTF type for this decl, then we just
878 * return the type information for the cached type.
879 */
880 if (ddp->dd_ctfp != NULL &&
881 (dmp = dt_module_lookup_by_ctf(dtp, ddp->dd_ctfp)) != NULL) {
882 tip->dtt_object = dmp->dm_name;
883 tip->dtt_ctfp = ddp->dd_ctfp;
884 tip->dtt_type = ddp->dd_type;
885 return (0);
886 }
887
888 /*
889 * Currently CTF treats all function pointers identically. We cache a
890 * representative ID of kind CTF_K_FUNCTION and just return that type.
891 * If we want to support full function declarations, dd_next refers to
892 * the declaration of the function return type, and the parameter list
893 * should be parsed and hung off a new pointer inside of this decl.
894 */
895 if (ddp->dd_kind == CTF_K_FUNCTION) {
896 tip->dtt_object = dtp->dt_ddefs->dm_name;
897 tip->dtt_ctfp = DT_FUNC_CTFP(dtp);
898 tip->dtt_type = DT_FUNC_TYPE(dtp);
899 return (0);
900 }
901
902 /*
903 * If the decl is a pointer, resolve the rest of the stack by calling
904 * dt_decl_type() recursively and then compute a pointer to the result.
905 * Similar to the code above, we return a cached id for function ptrs.
906 */
907 if (ddp->dd_kind == CTF_K_POINTER) {
908 if (ddp->dd_next->dd_kind == CTF_K_FUNCTION) {
909 tip->dtt_object = dtp->dt_ddefs->dm_name;
910 tip->dtt_ctfp = DT_FPTR_CTFP(dtp);
911 tip->dtt_type = DT_FPTR_TYPE(dtp);
912 return (0);
913 }
914
915 if ((rv = dt_decl_type(ddp->dd_next, tip)) == 0 &&
916 (rv = dt_type_pointer(tip)) != 0) {
917 xywarn(D_UNKNOWN, "cannot find type: %s*: %s\n",
918 dt_type_name(tip->dtt_ctfp, tip->dtt_type,
919 n, sizeof (n)), ctf_errmsg(dtp->dt_ctferr));
920 }
921
922 return (rv);
923 }
924
925 /*
926 * If the decl is an array, we must find the base type and then call
927 * dt_decl_type() recursively and then build an array of the result.
928 * The C and D multi-dimensional array syntax requires that consecutive
929 * array declarations be processed from right-to-left (i.e. top-down
930 * from the perspective of the declaration stack). For example, an
931 * array declaration such as int x[3][5] is stored on the stack as:
932 *
933 * (bottom) NULL <- ( INT "int" ) <- ( ARR [3] ) <- ( ARR [5] ) (top)
934 *
935 * but means that x is declared to be an array of 3 objects each of
936 * which is an array of 5 integers, or in CTF representation:
937 *
938 * type T1:( content=int, nelems=5 ) type T2:( content=T1, nelems=3 )
939 *
940 * For more details, refer to K&R[5.7] and ISO C 6.5.2.1. Rather than
941 * overcomplicate the implementation of dt_decl_type(), we push array
942 * declarations down into the stack in dt_decl_array(), above, so that
943 * by the time dt_decl_type() is called, the decl stack looks like:
944 *
945 * (bottom) NULL <- ( INT "int" ) <- ( ARR [5] ) <- ( ARR [3] ) (top)
946 *
947 * which permits a straightforward recursive descent of the decl stack
948 * to build the corresponding CTF type tree in the appropriate order.
949 */
950 if (ddp->dd_kind == CTF_K_ARRAY) {
951 /*
952 * If the array decl has a parameter list associated with it,
953 * this is an associative array declaration: return <DYN>.
954 */
955 if (ddp->dd_node != NULL &&
956 ddp->dd_node->dn_kind == DT_NODE_TYPE) {
957 tip->dtt_object = dtp->dt_ddefs->dm_name;
958 tip->dtt_ctfp = DT_DYN_CTFP(dtp);
959 tip->dtt_type = DT_DYN_TYPE(dtp);
960 return (0);
961 }
962
963 if ((rv = dt_decl_type(ddp->dd_next, tip)) != 0)
964 return (rv);
965
966 /*
967 * If the array base type is not defined in the target
968 * container or its parent, copy the type to the target
969 * container and reset dtt_ctfp and dtt_type to the copy.
970 */
971 if (tip->dtt_ctfp != dmp->dm_ctfp &&
972 tip->dtt_ctfp != ctf_parent_file(dmp->dm_ctfp)) {
973
974 tip->dtt_type = ctf_add_type(dmp->dm_ctfp,
975 tip->dtt_ctfp, tip->dtt_type);
976 tip->dtt_ctfp = dmp->dm_ctfp;
977
978 if (tip->dtt_type == CTF_ERR ||
979 ctf_update(tip->dtt_ctfp) == CTF_ERR) {
980 xywarn(D_UNKNOWN, "failed to copy type: %s\n",
981 ctf_errmsg(ctf_errno(tip->dtt_ctfp)));
982 return (-1);
983 }
984 }
985
986 /*
987 * The array index type is irrelevant in C and D: just set it
988 * to "long" for all array types that we create on-the-fly.
989 */
990 r.ctr_contents = tip->dtt_type;
991 r.ctr_index = ctf_lookup_by_name(tip->dtt_ctfp, "long");
992 r.ctr_nelems = ddp->dd_node ?
993 (uint_t)ddp->dd_node->dn_value : 0;
994
995 tip->dtt_object = dmp->dm_name;
996 tip->dtt_ctfp = dmp->dm_ctfp;
997 tip->dtt_type = ctf_add_array(dmp->dm_ctfp, CTF_ADD_ROOT, &r);
998
999 if (tip->dtt_type == CTF_ERR ||
1000 ctf_update(tip->dtt_ctfp) == CTF_ERR) {
1001 xywarn(D_UNKNOWN, "failed to create array type: %s\n",
1002 ctf_errmsg(ctf_errno(tip->dtt_ctfp)));
1003 return (-1);
1004 }
1005
1006 return (0);
1007 }
1008
1009 /*
1010 * Allocate space for the type name and enough space for the maximum
1011 * additional text ("unsigned long long \0" requires 20 more bytes).
1012 */
1013 name = alloca(ddp->dd_name ? strlen(ddp->dd_name) + 20 : 20);
1014 name[0] = '\0';
1015
1016 switch (ddp->dd_kind) {
1017 case CTF_K_INTEGER:
1018 case CTF_K_FLOAT:
1019 if (ddp->dd_attr & DT_DA_SIGNED)
1020 (void) strcat(name, "signed ");
1021 if (ddp->dd_attr & DT_DA_UNSIGNED)
1022 (void) strcat(name, "unsigned ");
1023 if (ddp->dd_attr & DT_DA_SHORT)
1024 (void) strcat(name, "short ");
1025 if (ddp->dd_attr & DT_DA_LONG)
1026 (void) strcat(name, "long ");
1027 if (ddp->dd_attr & DT_DA_LONGLONG)
1028 (void) strcat(name, "long long ");
1029 if (ddp->dd_attr == 0 && ddp->dd_name == NULL)
1030 (void) strcat(name, "int");
1031 break;
1032 case CTF_K_STRUCT:
1033 (void) strcpy(name, "struct ");
1034 break;
1035 case CTF_K_UNION:
1036 (void) strcpy(name, "union ");
1037 break;
1038 case CTF_K_ENUM:
1039 (void) strcpy(name, "enum ");
1040 break;
1041 case CTF_K_TYPEDEF:
1042 break;
1043 default:
1044 xywarn(D_UNKNOWN, "internal error -- "
1045 "bad decl kind %u\n", ddp->dd_kind);
1046 return (-1);
1047 }
1048
1049 /*
1050 * Add dd_name unless a short, long, or long long is explicitly
1051 * suffixed by int. We use the C/CTF canonical names for integers.
1052 */
1053 if (ddp->dd_name != NULL && (ddp->dd_kind != CTF_K_INTEGER ||
1054 (ddp->dd_attr & (DT_DA_SHORT | DT_DA_LONG | DT_DA_LONGLONG)) == 0))
1055 (void) strcat(name, ddp->dd_name);
1056
1057 /*
1058 * Lookup the type. If we find it, we're done. Otherwise create a
1059 * forward tag for the type if it is a struct, union, or enum. If
1060 * we can't find it and we can't create a tag, return failure.
1061 */
1062 if ((rv = dt_type_lookup(name, tip)) == 0)
1063 return (rv);
1064
1065 switch (ddp->dd_kind) {
1066 case CTF_K_STRUCT:
1067 case CTF_K_UNION:
1068 case CTF_K_ENUM:
1069 type = ctf_add_forward(dmp->dm_ctfp, flag,
1070 ddp->dd_name, ddp->dd_kind);
1071 break;
1072 default:
1073 xywarn(D_UNKNOWN, "failed to resolve type %s: %s\n", name,
1074 dtrace_errmsg(dtp, dtrace_errno(dtp)));
1075 return (rv);
1076 }
1077
1078 if (type == CTF_ERR || ctf_update(dmp->dm_ctfp) == CTF_ERR) {
1079 xywarn(D_UNKNOWN, "failed to add forward tag for %s: %s\n",
1080 name, ctf_errmsg(ctf_errno(dmp->dm_ctfp)));
1081 return (-1);
1082 }
1083
1084 ddp->dd_ctfp = dmp->dm_ctfp;
1085 ddp->dd_type = type;
1086
1087 tip->dtt_object = dmp->dm_name;
1088 tip->dtt_ctfp = dmp->dm_ctfp;
1089 tip->dtt_type = type;
1090
1091 return (0);
1092 }
1093
1094 void
dt_scope_create(dt_scope_t * dsp)1095 dt_scope_create(dt_scope_t *dsp)
1096 {
1097 dsp->ds_decl = NULL;
1098 dsp->ds_next = NULL;
1099 dsp->ds_ident = NULL;
1100 dsp->ds_ctfp = NULL;
1101 dsp->ds_type = CTF_ERR;
1102 dsp->ds_class = DT_DC_DEFAULT;
1103 dsp->ds_enumval = -1;
1104 }
1105
1106 void
dt_scope_destroy(dt_scope_t * dsp)1107 dt_scope_destroy(dt_scope_t *dsp)
1108 {
1109 dt_scope_t *nsp;
1110
1111 for (; dsp != NULL; dsp = nsp) {
1112 dt_decl_free(dsp->ds_decl);
1113 free(dsp->ds_ident);
1114 nsp = dsp->ds_next;
1115 if (dsp != &yypcb->pcb_dstack)
1116 free(dsp);
1117 }
1118 }
1119
1120 void
dt_scope_push(ctf_file_t * ctfp,ctf_id_t type)1121 dt_scope_push(ctf_file_t *ctfp, ctf_id_t type)
1122 {
1123 dt_scope_t *rsp = &yypcb->pcb_dstack;
1124 dt_scope_t *dsp = malloc(sizeof (dt_scope_t));
1125
1126 if (dsp == NULL)
1127 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
1128
1129 dsp->ds_decl = rsp->ds_decl;
1130 dsp->ds_next = rsp->ds_next;
1131 dsp->ds_ident = rsp->ds_ident;
1132 dsp->ds_ctfp = ctfp;
1133 dsp->ds_type = type;
1134 dsp->ds_class = rsp->ds_class;
1135 dsp->ds_enumval = rsp->ds_enumval;
1136
1137 dt_scope_create(rsp);
1138 rsp->ds_next = dsp;
1139 }
1140
1141 dt_decl_t *
dt_scope_pop(void)1142 dt_scope_pop(void)
1143 {
1144 dt_scope_t *rsp = &yypcb->pcb_dstack;
1145 dt_scope_t *dsp = rsp->ds_next;
1146
1147 if (dsp == NULL)
1148 longjmp(yypcb->pcb_jmpbuf, EDT_NOSCOPE);
1149
1150 if (dsp->ds_ctfp != NULL && ctf_update(dsp->ds_ctfp) == CTF_ERR) {
1151 xyerror(D_UNKNOWN, "failed to update type definitions: %s\n",
1152 ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
1153 }
1154
1155 dt_decl_free(rsp->ds_decl);
1156 free(rsp->ds_ident);
1157
1158 rsp->ds_decl = dsp->ds_decl;
1159 rsp->ds_next = dsp->ds_next;
1160 rsp->ds_ident = dsp->ds_ident;
1161 rsp->ds_ctfp = dsp->ds_ctfp;
1162 rsp->ds_type = dsp->ds_type;
1163 rsp->ds_class = dsp->ds_class;
1164 rsp->ds_enumval = dsp->ds_enumval;
1165
1166 free(dsp);
1167 return (rsp->ds_decl);
1168 }
1169