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 *
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 *
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
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
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 *
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 *
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 *
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 *
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 *
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
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 *
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 *
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
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
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 *
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 *
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 *
471 dt_decl_ptr(void)
472 {
473 return (dt_decl_push(dt_decl_alloc(CTF_K_POINTER, NULL)));
474 }
475
476 dt_decl_t *
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
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 xyerror(D_DECL_VOIDOBJ, "cannot have void member: %s\n", ident);
577
578 /*
579 * If a bit-field qualifier was part of the member declaration, create
580 * a new integer type of the same name and attributes as the base type
581 * and size equal to the specified number of bits. We reset 'dtt' to
582 * refer to this new bit-field type and continue on to add the member.
583 */
584 if (dnp != NULL) {
585 dnp = dt_node_cook(dnp, DT_IDFLG_REF);
586
587 /*
588 * A bit-field member with no declarator is permitted to have
589 * size zero and indicates that no more fields are to be packed
590 * into the current storage unit. We ignore these directives
591 * as the underlying ctf code currently does so for all fields.
592 */
593 if (ident == NULL && dnp->dn_kind == DT_NODE_INT &&
594 dnp->dn_value == 0) {
595 dt_node_free(dnp);
596 goto done;
597 }
598
599 if (dt_node_is_posconst(dnp) == 0) {
600 xyerror(D_DECL_BFCONST, "positive integral constant "
601 "expression expected as bit-field size\n");
602 }
603
604 if (ctf_type_kind(dtt.dtt_ctfp, base) != CTF_K_INTEGER ||
605 ctf_type_encoding(dtt.dtt_ctfp, base, &cte) == CTF_ERR ||
606 IS_VOID(cte)) {
607 xyerror(D_DECL_BFTYPE, "invalid type for "
608 "bit-field: %s\n", idname);
609 }
610
611 if (dnp->dn_value > cte.cte_bits) {
612 xyerror(D_DECL_BFSIZE, "bit-field too big "
613 "for type: %s\n", idname);
614 }
615
616 cte.cte_offset = 0;
617 cte.cte_bits = (uint_t)dnp->dn_value;
618
619 dtt.dtt_type = ctf_add_integer(dsp->ds_ctfp,
620 CTF_ADD_NONROOT, ctf_type_name(dtt.dtt_ctfp,
621 dtt.dtt_type, n, sizeof (n)), &cte);
622
623 if (dtt.dtt_type == CTF_ERR ||
624 ctf_update(dsp->ds_ctfp) == CTF_ERR) {
625 xyerror(D_UNKNOWN, "failed to create type for "
626 "member '%s': %s\n", idname,
627 ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
628 }
629
630 dtt.dtt_ctfp = dsp->ds_ctfp;
631 dt_node_free(dnp);
632 }
633
634 /*
635 * If the member type is not defined in the same CTF container as the
636 * one associated with the current scope (i.e. the container for the
637 * struct or union itself) or its parent, copy the member type into
638 * this container and reset dtt to refer to the copied type.
639 */
640 if (dtt.dtt_ctfp != dsp->ds_ctfp &&
641 dtt.dtt_ctfp != ctf_parent_file(dsp->ds_ctfp)) {
642
643 dtt.dtt_type = ctf_add_type(dsp->ds_ctfp,
644 dtt.dtt_ctfp, dtt.dtt_type);
645 dtt.dtt_ctfp = dsp->ds_ctfp;
646
647 if (dtt.dtt_type == CTF_ERR ||
648 ctf_update(dtt.dtt_ctfp) == CTF_ERR) {
649 xyerror(D_UNKNOWN, "failed to copy type of '%s': %s\n",
650 idname, ctf_errmsg(ctf_errno(dtt.dtt_ctfp)));
651 }
652 }
653
654 if (ctf_add_member(dsp->ds_ctfp, dsp->ds_type,
655 ident, dtt.dtt_type, ULONG_MAX) == CTF_ERR) {
656 xyerror(D_UNKNOWN, "failed to define member '%s': %s\n",
657 idname, ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
658 }
659
660 done:
661 free(ident);
662 yypcb->pcb_dstack.ds_ident = NULL;
663 dt_decl_reset();
664 }
665
666 /*ARGSUSED*/
667 static int
668 dt_decl_hasmembers(const char *name, int value, void *private)
669 {
670 return (1); /* abort search and return true if a member exists */
671 }
672
673 dt_decl_t *
674 dt_decl_enum(char *name)
675 {
676 dt_decl_t *ddp = dt_decl_spec(CTF_K_ENUM, name);
677 char n[DT_TYPE_NAMELEN];
678 ctf_file_t *ctfp;
679 ctf_id_t type;
680 uint_t flag;
681
682 if (yypcb->pcb_idepth != 0)
683 ctfp = yypcb->pcb_hdl->dt_cdefs->dm_ctfp;
684 else
685 ctfp = yypcb->pcb_hdl->dt_ddefs->dm_ctfp;
686
687 if (yypcb->pcb_dstack.ds_next != NULL)
688 flag = CTF_ADD_NONROOT;
689 else
690 flag = CTF_ADD_ROOT;
691
692 (void) snprintf(n, sizeof (n), "enum %s", name ? name : "(anon)");
693
694 if (name != NULL && (type = ctf_lookup_by_name(ctfp, n)) != CTF_ERR) {
695 if (ctf_enum_iter(ctfp, type, dt_decl_hasmembers, NULL))
696 xyerror(D_DECL_TYPERED, "type redeclared: %s\n", n);
697 } else if ((type = ctf_add_enum(ctfp, flag, name, 0)) == CTF_ERR) {
698 xyerror(D_UNKNOWN, "failed to define %s: %s\n",
699 n, ctf_errmsg(ctf_errno(ctfp)));
700 }
701
702 ddp->dd_ctfp = ctfp;
703 ddp->dd_type = type;
704
705 dt_scope_push(ctfp, type);
706 return (ddp);
707 }
708
709 void
710 dt_decl_enumerator(char *s, dt_node_t *dnp)
711 {
712 dt_scope_t *dsp = yypcb->pcb_dstack.ds_next;
713 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
714
715 dt_idnode_t *inp;
716 dt_ident_t *idp;
717 char *name;
718 int value;
719
720 name = strdupa(s);
721 free(s);
722
723 if (dsp == NULL)
724 longjmp(yypcb->pcb_jmpbuf, EDT_NOSCOPE);
725
726 assert(dsp->ds_decl->dd_kind == CTF_K_ENUM);
727 value = dsp->ds_enumval + 1; /* default is previous value plus one */
728
729 if (strchr(name, '`') != NULL) {
730 xyerror(D_DECL_SCOPE, "D scoping operator may not be used in "
731 "an enumerator name (%s)\n", name);
732 }
733
734 /*
735 * If the enumerator is being assigned a value, cook and check the node
736 * and then free it after we get the value. We also permit references
737 * to identifiers which are previously defined enumerators in the type.
738 */
739 if (dnp != NULL) {
740 if (dnp->dn_kind != DT_NODE_IDENT || ctf_enum_value(
741 dsp->ds_ctfp, dsp->ds_type, dnp->dn_string, &value) != 0) {
742 dnp = dt_node_cook(dnp, DT_IDFLG_REF);
743
744 if (dnp->dn_kind != DT_NODE_INT) {
745 xyerror(D_DECL_ENCONST, "enumerator '%s' must "
746 "be assigned to an integral constant "
747 "expression\n", name);
748 }
749
750 if ((intmax_t)dnp->dn_value > INT_MAX ||
751 (intmax_t)dnp->dn_value < INT_MIN) {
752 xyerror(D_DECL_ENOFLOW, "enumerator '%s' value "
753 "overflows INT_MAX (%d)\n", name, INT_MAX);
754 }
755
756 value = (int)dnp->dn_value;
757 }
758 dt_node_free(dnp);
759 }
760
761 if (ctf_add_enumerator(dsp->ds_ctfp, dsp->ds_type,
762 name, value) == CTF_ERR || ctf_update(dsp->ds_ctfp) == CTF_ERR) {
763 xyerror(D_UNKNOWN, "failed to define enumerator '%s': %s\n",
764 name, ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
765 }
766
767 dsp->ds_enumval = value; /* save most recent value */
768
769 /*
770 * If the enumerator name matches an identifier in the global scope,
771 * flag this as an error. We only do this for "D" enumerators to
772 * prevent "C" header file enumerators from conflicting with the ever-
773 * growing list of D built-in global variables and inlines. If a "C"
774 * enumerator conflicts with a global identifier, we add the enumerator
775 * but do not insert a corresponding inline (i.e. the D variable wins).
776 */
777 if (dt_idstack_lookup(&yypcb->pcb_globals, name) != NULL) {
778 if (dsp->ds_ctfp == dtp->dt_ddefs->dm_ctfp) {
779 xyerror(D_DECL_IDRED,
780 "identifier redeclared: %s\n", name);
781 } else
782 return;
783 }
784
785 dt_dprintf("add global enumerator %s = %d\n", name, value);
786
787 idp = dt_idhash_insert(dtp->dt_globals, name, DT_IDENT_ENUM,
788 DT_IDFLG_INLINE | DT_IDFLG_REF, 0, _dtrace_defattr, 0,
789 &dt_idops_inline, NULL, dtp->dt_gen);
790
791 if (idp == NULL)
792 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
793
794 yyintprefix = 0;
795 yyintsuffix[0] = '\0';
796 yyintdecimal = 0;
797
798 dnp = dt_node_int(value);
799 dt_node_type_assign(dnp, dsp->ds_ctfp, dsp->ds_type, B_FALSE);
800
801 if ((inp = malloc(sizeof (dt_idnode_t))) == NULL)
802 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
803
804 /*
805 * Remove the INT node from the node allocation list and store it in
806 * din_list and din_root so it persists with and is freed by the ident.
807 */
808 assert(yypcb->pcb_list == dnp);
809 yypcb->pcb_list = dnp->dn_link;
810 dnp->dn_link = NULL;
811
812 bzero(inp, sizeof (dt_idnode_t));
813 inp->din_list = dnp;
814 inp->din_root = dnp;
815
816 idp->di_iarg = inp;
817 idp->di_ctfp = dsp->ds_ctfp;
818 idp->di_type = dsp->ds_type;
819 }
820
821 /*
822 * Look up the type corresponding to the specified decl stack. The scoping of
823 * the underlying type names is handled by dt_type_lookup(). We build up the
824 * name from the specified string and prefixes and then lookup the type. If
825 * we fail, an errmsg is saved and the caller must abort with EDT_COMPILER.
826 */
827 int
828 dt_decl_type(dt_decl_t *ddp, dtrace_typeinfo_t *tip)
829 {
830 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
831
832 dt_module_t *dmp;
833 ctf_arinfo_t r;
834 ctf_id_t type;
835
836 char n[DT_TYPE_NAMELEN];
837 uint_t flag;
838 char *name;
839 int rv;
840
841 tip->dtt_flags = 0;
842
843 /*
844 * Based on our current #include depth and decl stack depth, determine
845 * which dynamic CTF module and scope to use when adding any new types.
846 */
847 dmp = yypcb->pcb_idepth ? dtp->dt_cdefs : dtp->dt_ddefs;
848 flag = yypcb->pcb_dstack.ds_next ? CTF_ADD_NONROOT : CTF_ADD_ROOT;
849
850 if (ddp->dd_attr & DT_DA_USER)
851 tip->dtt_flags = DTT_FL_USER;
852
853 /*
854 * If we have already cached a CTF type for this decl, then we just
855 * return the type information for the cached type.
856 */
857 if (ddp->dd_ctfp != NULL &&
858 (dmp = dt_module_lookup_by_ctf(dtp, ddp->dd_ctfp)) != NULL) {
859 tip->dtt_object = dmp->dm_name;
860 tip->dtt_ctfp = ddp->dd_ctfp;
861 tip->dtt_type = ddp->dd_type;
862 return (0);
863 }
864
865 /*
866 * Currently CTF treats all function pointers identically. We cache a
867 * representative ID of kind CTF_K_FUNCTION and just return that type.
868 * If we want to support full function declarations, dd_next refers to
869 * the declaration of the function return type, and the parameter list
870 * should be parsed and hung off a new pointer inside of this decl.
871 */
872 if (ddp->dd_kind == CTF_K_FUNCTION) {
873 tip->dtt_object = dtp->dt_ddefs->dm_name;
874 tip->dtt_ctfp = DT_FUNC_CTFP(dtp);
875 tip->dtt_type = DT_FUNC_TYPE(dtp);
876 return (0);
877 }
878
879 /*
880 * If the decl is a pointer, resolve the rest of the stack by calling
881 * dt_decl_type() recursively and then compute a pointer to the result.
882 * Similar to the code above, we return a cached id for function ptrs.
883 */
884 if (ddp->dd_kind == CTF_K_POINTER) {
885 if (ddp->dd_next->dd_kind == CTF_K_FUNCTION) {
886 tip->dtt_object = dtp->dt_ddefs->dm_name;
887 tip->dtt_ctfp = DT_FPTR_CTFP(dtp);
888 tip->dtt_type = DT_FPTR_TYPE(dtp);
889 return (0);
890 }
891
892 if ((rv = dt_decl_type(ddp->dd_next, tip)) == 0 &&
893 (rv = dt_type_pointer(tip)) != 0) {
894 xywarn(D_UNKNOWN, "cannot find type: %s*: %s\n",
895 dt_type_name(tip->dtt_ctfp, tip->dtt_type,
896 n, sizeof (n)), ctf_errmsg(dtp->dt_ctferr));
897 }
898
899 return (rv);
900 }
901
902 /*
903 * If the decl is an array, we must find the base type and then call
904 * dt_decl_type() recursively and then build an array of the result.
905 * The C and D multi-dimensional array syntax requires that consecutive
906 * array declarations be processed from right-to-left (i.e. top-down
907 * from the perspective of the declaration stack). For example, an
908 * array declaration such as int x[3][5] is stored on the stack as:
909 *
910 * (bottom) NULL <- ( INT "int" ) <- ( ARR [3] ) <- ( ARR [5] ) (top)
911 *
912 * but means that x is declared to be an array of 3 objects each of
913 * which is an array of 5 integers, or in CTF representation:
914 *
915 * type T1:( content=int, nelems=5 ) type T2:( content=T1, nelems=3 )
916 *
917 * For more details, refer to K&R[5.7] and ISO C 6.5.2.1. Rather than
918 * overcomplicate the implementation of dt_decl_type(), we push array
919 * declarations down into the stack in dt_decl_array(), above, so that
920 * by the time dt_decl_type() is called, the decl stack looks like:
921 *
922 * (bottom) NULL <- ( INT "int" ) <- ( ARR [5] ) <- ( ARR [3] ) (top)
923 *
924 * which permits a straightforward recursive descent of the decl stack
925 * to build the corresponding CTF type tree in the appropriate order.
926 */
927 if (ddp->dd_kind == CTF_K_ARRAY) {
928 /*
929 * If the array decl has a parameter list associated with it,
930 * this is an associative array declaration: return <DYN>.
931 */
932 if (ddp->dd_node != NULL &&
933 ddp->dd_node->dn_kind == DT_NODE_TYPE) {
934 tip->dtt_object = dtp->dt_ddefs->dm_name;
935 tip->dtt_ctfp = DT_DYN_CTFP(dtp);
936 tip->dtt_type = DT_DYN_TYPE(dtp);
937 return (0);
938 }
939
940 if ((rv = dt_decl_type(ddp->dd_next, tip)) != 0)
941 return (rv);
942
943 /*
944 * If the array base type is not defined in the target
945 * container or its parent, copy the type to the target
946 * container and reset dtt_ctfp and dtt_type to the copy.
947 */
948 if (tip->dtt_ctfp != dmp->dm_ctfp &&
949 tip->dtt_ctfp != ctf_parent_file(dmp->dm_ctfp)) {
950
951 tip->dtt_type = ctf_add_type(dmp->dm_ctfp,
952 tip->dtt_ctfp, tip->dtt_type);
953 tip->dtt_ctfp = dmp->dm_ctfp;
954
955 if (tip->dtt_type == CTF_ERR ||
956 ctf_update(tip->dtt_ctfp) == CTF_ERR) {
957 xywarn(D_UNKNOWN, "failed to copy type: %s\n",
958 ctf_errmsg(ctf_errno(tip->dtt_ctfp)));
959 return (-1);
960 }
961 }
962
963 /*
964 * The array index type is irrelevant in C and D: just set it
965 * to "long" for all array types that we create on-the-fly.
966 */
967 r.ctr_contents = tip->dtt_type;
968 r.ctr_index = ctf_lookup_by_name(tip->dtt_ctfp, "long");
969 r.ctr_nelems = ddp->dd_node ?
970 (uint_t)ddp->dd_node->dn_value : 0;
971
972 tip->dtt_object = dmp->dm_name;
973 tip->dtt_ctfp = dmp->dm_ctfp;
974 tip->dtt_type = ctf_add_array(dmp->dm_ctfp, CTF_ADD_ROOT, &r);
975
976 if (tip->dtt_type == CTF_ERR ||
977 ctf_update(tip->dtt_ctfp) == CTF_ERR) {
978 xywarn(D_UNKNOWN, "failed to create array type: %s\n",
979 ctf_errmsg(ctf_errno(tip->dtt_ctfp)));
980 return (-1);
981 }
982
983 return (0);
984 }
985
986 /*
987 * Allocate space for the type name and enough space for the maximum
988 * additional text ("unsigned long long \0" requires 20 more bytes).
989 */
990 name = alloca(ddp->dd_name ? strlen(ddp->dd_name) + 20 : 20);
991 name[0] = '\0';
992
993 switch (ddp->dd_kind) {
994 case CTF_K_INTEGER:
995 case CTF_K_FLOAT:
996 if (ddp->dd_attr & DT_DA_SIGNED)
997 (void) strcat(name, "signed ");
998 if (ddp->dd_attr & DT_DA_UNSIGNED)
999 (void) strcat(name, "unsigned ");
1000 if (ddp->dd_attr & DT_DA_SHORT)
1001 (void) strcat(name, "short ");
1002 if (ddp->dd_attr & DT_DA_LONG)
1003 (void) strcat(name, "long ");
1004 if (ddp->dd_attr & DT_DA_LONGLONG)
1005 (void) strcat(name, "long long ");
1006 if (ddp->dd_attr == 0 && ddp->dd_name == NULL)
1007 (void) strcat(name, "int");
1008 break;
1009 case CTF_K_STRUCT:
1010 (void) strcpy(name, "struct ");
1011 break;
1012 case CTF_K_UNION:
1013 (void) strcpy(name, "union ");
1014 break;
1015 case CTF_K_ENUM:
1016 (void) strcpy(name, "enum ");
1017 break;
1018 case CTF_K_TYPEDEF:
1019 break;
1020 default:
1021 xywarn(D_UNKNOWN, "internal error -- "
1022 "bad decl kind %u\n", ddp->dd_kind);
1023 return (-1);
1024 }
1025
1026 /*
1027 * Add dd_name unless a short, long, or long long is explicitly
1028 * suffixed by int. We use the C/CTF canonical names for integers.
1029 */
1030 if (ddp->dd_name != NULL && (ddp->dd_kind != CTF_K_INTEGER ||
1031 (ddp->dd_attr & (DT_DA_SHORT | DT_DA_LONG | DT_DA_LONGLONG)) == 0))
1032 (void) strcat(name, ddp->dd_name);
1033
1034 /*
1035 * Lookup the type. If we find it, we're done. Otherwise create a
1036 * forward tag for the type if it is a struct, union, or enum. If
1037 * we can't find it and we can't create a tag, return failure.
1038 */
1039 if ((rv = dt_type_lookup(name, tip)) == 0)
1040 return (rv);
1041
1042 switch (ddp->dd_kind) {
1043 case CTF_K_STRUCT:
1044 case CTF_K_UNION:
1045 case CTF_K_ENUM:
1046 type = ctf_add_forward(dmp->dm_ctfp, flag,
1047 ddp->dd_name, ddp->dd_kind);
1048 break;
1049 default:
1050 xywarn(D_UNKNOWN, "failed to resolve type %s: %s\n", name,
1051 dtrace_errmsg(dtp, dtrace_errno(dtp)));
1052 return (rv);
1053 }
1054
1055 if (type == CTF_ERR || ctf_update(dmp->dm_ctfp) == CTF_ERR) {
1056 xywarn(D_UNKNOWN, "failed to add forward tag for %s: %s\n",
1057 name, ctf_errmsg(ctf_errno(dmp->dm_ctfp)));
1058 return (-1);
1059 }
1060
1061 ddp->dd_ctfp = dmp->dm_ctfp;
1062 ddp->dd_type = type;
1063
1064 tip->dtt_object = dmp->dm_name;
1065 tip->dtt_ctfp = dmp->dm_ctfp;
1066 tip->dtt_type = type;
1067
1068 return (0);
1069 }
1070
1071 void
1072 dt_scope_create(dt_scope_t *dsp)
1073 {
1074 dsp->ds_decl = NULL;
1075 dsp->ds_next = NULL;
1076 dsp->ds_ident = NULL;
1077 dsp->ds_ctfp = NULL;
1078 dsp->ds_type = CTF_ERR;
1079 dsp->ds_class = DT_DC_DEFAULT;
1080 dsp->ds_enumval = -1;
1081 }
1082
1083 void
1084 dt_scope_destroy(dt_scope_t *dsp)
1085 {
1086 dt_scope_t *nsp;
1087
1088 for (; dsp != NULL; dsp = nsp) {
1089 dt_decl_free(dsp->ds_decl);
1090 free(dsp->ds_ident);
1091 nsp = dsp->ds_next;
1092 if (dsp != &yypcb->pcb_dstack)
1093 free(dsp);
1094 }
1095 }
1096
1097 void
1098 dt_scope_push(ctf_file_t *ctfp, ctf_id_t type)
1099 {
1100 dt_scope_t *rsp = &yypcb->pcb_dstack;
1101 dt_scope_t *dsp = malloc(sizeof (dt_scope_t));
1102
1103 if (dsp == NULL)
1104 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
1105
1106 dsp->ds_decl = rsp->ds_decl;
1107 dsp->ds_next = rsp->ds_next;
1108 dsp->ds_ident = rsp->ds_ident;
1109 dsp->ds_ctfp = ctfp;
1110 dsp->ds_type = type;
1111 dsp->ds_class = rsp->ds_class;
1112 dsp->ds_enumval = rsp->ds_enumval;
1113
1114 dt_scope_create(rsp);
1115 rsp->ds_next = dsp;
1116 }
1117
1118 dt_decl_t *
1119 dt_scope_pop(void)
1120 {
1121 dt_scope_t *rsp = &yypcb->pcb_dstack;
1122 dt_scope_t *dsp = rsp->ds_next;
1123
1124 if (dsp == NULL)
1125 longjmp(yypcb->pcb_jmpbuf, EDT_NOSCOPE);
1126
1127 if (dsp->ds_ctfp != NULL && ctf_update(dsp->ds_ctfp) == CTF_ERR) {
1128 xyerror(D_UNKNOWN, "failed to update type definitions: %s\n",
1129 ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
1130 }
1131
1132 dt_decl_free(rsp->ds_decl);
1133 free(rsp->ds_ident);
1134
1135 rsp->ds_decl = dsp->ds_decl;
1136 rsp->ds_next = dsp->ds_next;
1137 rsp->ds_ident = dsp->ds_ident;
1138 rsp->ds_ctfp = dsp->ds_ctfp;
1139 rsp->ds_type = dsp->ds_type;
1140 rsp->ds_class = dsp->ds_class;
1141 rsp->ds_enumval = dsp->ds_enumval;
1142
1143 free(dsp);
1144 return (rsp->ds_decl);
1145 }