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) 2013 by Delphix. All rights reserved.
25 * Copyright (c) 2013 Joyent, Inc. All rights reserved.
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_LONG)) {
271 ddp->dd_attr &= ~DT_DA_LONG;
272 attr = DT_DA_LONGLONG;
273 }
274
275 ddp->dd_attr |= attr;
276 return (dt_decl_check(ddp));
277 }
278
279 /*
280 * Examine the list of formal parameters 'flist' and determine if the formal
281 * name fnp->dn_string is defined in this list (B_TRUE) or not (B_FALSE).
282 * If 'fnp' is in 'flist', do not search beyond 'fnp' itself in 'flist'.
283 */
284 static int
285 dt_decl_protoform(dt_node_t *fnp, dt_node_t *flist)
286 {
287 dt_node_t *dnp;
288
289 for (dnp = flist; dnp != fnp && dnp != NULL; dnp = dnp->dn_list) {
290 if (dnp->dn_string != NULL &&
291 strcmp(dnp->dn_string, fnp->dn_string) == 0)
292 return (B_TRUE);
293 }
294
295 return (B_FALSE);
296 }
297
298 /*
299 * Common code for parsing array, function, and probe definition prototypes.
300 * The prototype node list is specified as 'plist'. The formal prototype
301 * against which to compare the prototype is specified as 'flist'. If plist
302 * and flist are the same, we require that named parameters are unique. If
303 * plist and flist are different, we require that named parameters in plist
304 * match a name that is present in flist.
305 */
306 int
307 dt_decl_prototype(dt_node_t *plist,
308 dt_node_t *flist, const char *kind, uint_t flags)
309 {
310 char n[DT_TYPE_NAMELEN];
311 int is_void, v = 0, i = 1;
312 int form = plist != flist;
313 dt_node_t *dnp;
314
315 for (dnp = plist; dnp != NULL; dnp = dnp->dn_list, i++) {
316
317 if (dnp->dn_type == CTF_ERR && !(flags & DT_DP_VARARGS)) {
318 dnerror(dnp, D_DECL_PROTO_VARARGS, "%s prototype may "
319 "not use a variable-length argument list\n", kind);
320 }
321
322 if (dt_node_is_dynamic(dnp) && !(flags & DT_DP_DYNAMIC)) {
323 dnerror(dnp, D_DECL_PROTO_TYPE, "%s prototype may not "
324 "use parameter of type %s: %s, parameter #%d\n",
325 kind, dt_node_type_name(dnp, n, sizeof (n)),
326 dnp->dn_string ? dnp->dn_string : "(anonymous)", i);
327 }
328
329 is_void = dt_node_is_void(dnp);
330 v += is_void;
331
332 if (is_void && !(flags & DT_DP_VOID)) {
333 dnerror(dnp, D_DECL_PROTO_TYPE, "%s prototype may not "
334 "use parameter of type %s: %s, parameter #%d\n",
335 kind, dt_node_type_name(dnp, n, sizeof (n)),
336 dnp->dn_string ? dnp->dn_string : "(anonymous)", i);
337 }
338
339 if (is_void && dnp->dn_string != NULL) {
340 dnerror(dnp, D_DECL_PROTO_NAME, "void parameter may "
341 "not have a name: %s\n", dnp->dn_string);
342 }
343
344 if (dnp->dn_string != NULL &&
345 dt_decl_protoform(dnp, flist) != form) {
346 dnerror(dnp, D_DECL_PROTO_FORM, "parameter is "
347 "%s declared in %s prototype: %s, parameter #%d\n",
348 form ? "not" : "already", kind, dnp->dn_string, i);
349 }
350
351 if (dnp->dn_string == NULL &&
352 !is_void && !(flags & DT_DP_ANON)) {
353 dnerror(dnp, D_DECL_PROTO_NAME, "parameter declaration "
354 "requires a name: parameter #%d\n", i);
355 }
356 }
357
358 if (v != 0 && plist->dn_list != NULL)
359 xyerror(D_DECL_PROTO_VOID, "void must be sole parameter\n");
360
361 return (v ? 0 : i - 1); /* return zero if sole parameter is 'void' */
362 }
363
364 dt_decl_t *
365 dt_decl_array(dt_node_t *dnp)
366 {
367 dt_decl_t *ddp = dt_decl_push(dt_decl_alloc(CTF_K_ARRAY, NULL));
368 dt_scope_t *dsp = &yypcb->pcb_dstack;
369 dt_decl_t *ndp = ddp;
370
371 /*
372 * After pushing the array on to the decl stack, scan ahead for multi-
373 * dimensional array declarations and push the current decl to the
374 * bottom to match the resulting CTF type tree and data layout. Refer
375 * to the comments in dt_decl_type() and ISO C 6.5.2.1 for more info.
376 */
377 while (ndp->dd_next != NULL && ndp->dd_next->dd_kind == CTF_K_ARRAY)
378 ndp = ndp->dd_next; /* skip to bottom-most array declaration */
379
380 if (ndp != ddp) {
381 if (dnp != NULL && dnp->dn_kind == DT_NODE_TYPE) {
382 xyerror(D_DECL_DYNOBJ,
383 "cannot declare array of associative arrays\n");
384 }
385 dsp->ds_decl = ddp->dd_next;
386 ddp->dd_next = ndp->dd_next;
387 ndp->dd_next = ddp;
388 }
389
390 if (ddp->dd_next->dd_name != NULL &&
391 strcmp(ddp->dd_next->dd_name, "void") == 0)
392 xyerror(D_DECL_VOIDOBJ, "cannot declare array of void\n");
393
394 if (dnp != NULL && dnp->dn_kind != DT_NODE_TYPE) {
395 dnp = ddp->dd_node = dt_node_cook(dnp, DT_IDFLG_REF);
396
397 if (dt_node_is_posconst(dnp) == 0) {
398 xyerror(D_DECL_ARRSUB, "positive integral constant "
399 "expression or tuple signature expected as "
400 "array declaration subscript\n");
401 }
402
403 if (dnp->dn_value > UINT_MAX)
404 xyerror(D_DECL_ARRBIG, "array dimension too big\n");
405
406 } else if (dnp != NULL) {
407 ddp->dd_node = dnp;
408 (void) dt_decl_prototype(dnp, dnp, "array", DT_DP_ANON);
409 }
410
411 return (ddp);
412 }
413
414 /*
415 * When a function is declared, we need to fudge the decl stack a bit if the
416 * declaration uses the function pointer (*)() syntax. In this case, the
417 * dt_decl_func() call occurs *after* the dt_decl_ptr() call, even though the
418 * resulting type is "pointer to function". To make the pointer land on top,
419 * we check to see if 'pdp' is non-NULL and a pointer. If it is, we search
420 * backward for a decl tagged with DT_DA_PAREN, and if one is found, the func
421 * decl is inserted behind this node in the decl list instead of at the top.
422 * In all cases, the func decl's dd_next pointer is set to the decl chain
423 * for the function's return type and the function parameter list is discarded.
424 */
425 dt_decl_t *
426 dt_decl_func(dt_decl_t *pdp, dt_node_t *dnp)
427 {
428 dt_decl_t *ddp = dt_decl_alloc(CTF_K_FUNCTION, NULL);
429
430 ddp->dd_node = dnp;
431
432 (void) dt_decl_prototype(dnp, dnp, "function",
433 DT_DP_VARARGS | DT_DP_VOID | DT_DP_ANON);
434
435 if (pdp == NULL || pdp->dd_kind != CTF_K_POINTER)
436 return (dt_decl_push(ddp));
437
438 while (pdp->dd_next != NULL && !(pdp->dd_next->dd_attr & DT_DA_PAREN))
439 pdp = pdp->dd_next;
440
441 if (pdp->dd_next == NULL)
442 return (dt_decl_push(ddp));
443
444 ddp->dd_next = pdp->dd_next;
445 pdp->dd_next = ddp;
446
447 return (pdp);
448 }
449
450 dt_decl_t *
451 dt_decl_ptr(void)
452 {
453 return (dt_decl_push(dt_decl_alloc(CTF_K_POINTER, NULL)));
454 }
455
456 dt_decl_t *
457 dt_decl_sou(uint_t kind, char *name)
458 {
459 dt_decl_t *ddp = dt_decl_spec(kind, name);
460 char n[DT_TYPE_NAMELEN];
461 ctf_file_t *ctfp;
462 ctf_id_t type;
463 uint_t flag;
464
465 if (yypcb->pcb_idepth != 0)
466 ctfp = yypcb->pcb_hdl->dt_cdefs->dm_ctfp;
467 else
468 ctfp = yypcb->pcb_hdl->dt_ddefs->dm_ctfp;
469
470 if (yypcb->pcb_dstack.ds_next != NULL)
471 flag = CTF_ADD_NONROOT;
472 else
473 flag = CTF_ADD_ROOT;
474
475 (void) snprintf(n, sizeof (n), "%s %s",
476 kind == CTF_K_STRUCT ? "struct" : "union",
477 name == NULL ? "(anon)" : name);
478
479 if (name != NULL && (type = ctf_lookup_by_name(ctfp, n)) != CTF_ERR &&
480 ctf_type_kind(ctfp, type) != CTF_K_FORWARD)
481 xyerror(D_DECL_TYPERED, "type redeclared: %s\n", n);
482
483 if (kind == CTF_K_STRUCT)
484 type = ctf_add_struct(ctfp, flag, name);
485 else
486 type = ctf_add_union(ctfp, flag, name);
487
488 if (type == CTF_ERR || ctf_update(ctfp) == CTF_ERR) {
489 xyerror(D_UNKNOWN, "failed to define %s: %s\n",
490 n, ctf_errmsg(ctf_errno(ctfp)));
491 }
492
493 ddp->dd_ctfp = ctfp;
494 ddp->dd_type = type;
495
496 dt_scope_push(ctfp, type);
497 return (ddp);
498 }
499
500 void
501 dt_decl_member(dt_node_t *dnp)
502 {
503 dt_scope_t *dsp = yypcb->pcb_dstack.ds_next;
504 dt_decl_t *ddp = yypcb->pcb_dstack.ds_decl;
505 char *ident = yypcb->pcb_dstack.ds_ident;
506
507 const char *idname = ident ? ident : "(anon)";
508 char n[DT_TYPE_NAMELEN];
509
510 dtrace_typeinfo_t dtt;
511 ctf_encoding_t cte;
512 ctf_id_t base;
513 uint_t kind;
514 ssize_t size;
515
516 if (dsp == NULL)
517 longjmp(yypcb->pcb_jmpbuf, EDT_NOSCOPE);
518
519 if (ddp == NULL)
520 longjmp(yypcb->pcb_jmpbuf, EDT_NODECL);
521
522 if (dnp == NULL && ident == NULL)
523 xyerror(D_DECL_MNAME, "member declaration requires a name\n");
524
525 if (ddp->dd_kind == CTF_K_UNKNOWN && ddp->dd_name == NULL) {
526 ddp->dd_kind = CTF_K_INTEGER;
527 (void) dt_decl_check(ddp);
528 }
529
530 if (dt_decl_type(ddp, &dtt) != 0)
531 longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
532
533 if (ident != NULL && strchr(ident, '`') != NULL) {
534 xyerror(D_DECL_SCOPE, "D scoping operator may not be used "
535 "in a member name (%s)\n", ident);
536 }
537
538 if (dtt.dtt_ctfp == DT_DYN_CTFP(yypcb->pcb_hdl) &&
539 dtt.dtt_type == DT_DYN_TYPE(yypcb->pcb_hdl)) {
540 xyerror(D_DECL_DYNOBJ,
541 "cannot have dynamic member: %s\n", ident);
542 }
543
544 base = ctf_type_resolve(dtt.dtt_ctfp, dtt.dtt_type);
545 kind = ctf_type_kind(dtt.dtt_ctfp, base);
546 size = ctf_type_size(dtt.dtt_ctfp, base);
547
548 if (kind == CTF_K_FORWARD || ((kind == CTF_K_STRUCT ||
549 kind == CTF_K_UNION) && size == 0)) {
550 xyerror(D_DECL_INCOMPLETE, "incomplete struct/union/enum %s: "
551 "%s\n", dt_type_name(dtt.dtt_ctfp, dtt.dtt_type,
552 n, sizeof (n)), ident);
553 }
554
555 if (size == 0)
556 xyerror(D_DECL_VOIDOBJ, "cannot have void member: %s\n", ident);
557
558 /*
559 * If a bit-field qualifier was part of the member declaration, create
560 * a new integer type of the same name and attributes as the base type
561 * and size equal to the specified number of bits. We reset 'dtt' to
562 * refer to this new bit-field type and continue on to add the member.
563 */
564 if (dnp != NULL) {
565 dnp = dt_node_cook(dnp, DT_IDFLG_REF);
566
567 /*
568 * A bit-field member with no declarator is permitted to have
569 * size zero and indicates that no more fields are to be packed
570 * into the current storage unit. We ignore these directives
571 * as the underlying ctf code currently does so for all fields.
572 */
573 if (ident == NULL && dnp->dn_kind == DT_NODE_INT &&
574 dnp->dn_value == 0) {
575 dt_node_free(dnp);
576 goto done;
577 }
578
579 if (dt_node_is_posconst(dnp) == 0) {
580 xyerror(D_DECL_BFCONST, "positive integral constant "
581 "expression expected as bit-field size\n");
582 }
583
584 if (ctf_type_kind(dtt.dtt_ctfp, base) != CTF_K_INTEGER ||
585 ctf_type_encoding(dtt.dtt_ctfp, base, &cte) == CTF_ERR ||
586 IS_VOID(cte)) {
587 xyerror(D_DECL_BFTYPE, "invalid type for "
588 "bit-field: %s\n", idname);
589 }
590
591 if (dnp->dn_value > cte.cte_bits) {
592 xyerror(D_DECL_BFSIZE, "bit-field too big "
593 "for type: %s\n", idname);
594 }
595
596 cte.cte_offset = 0;
597 cte.cte_bits = (uint_t)dnp->dn_value;
598
599 dtt.dtt_type = ctf_add_integer(dsp->ds_ctfp,
600 CTF_ADD_NONROOT, ctf_type_name(dtt.dtt_ctfp,
601 dtt.dtt_type, n, sizeof (n)), &cte);
602
603 if (dtt.dtt_type == CTF_ERR ||
604 ctf_update(dsp->ds_ctfp) == CTF_ERR) {
605 xyerror(D_UNKNOWN, "failed to create type for "
606 "member '%s': %s\n", idname,
607 ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
608 }
609
610 dtt.dtt_ctfp = dsp->ds_ctfp;
611 dt_node_free(dnp);
612 }
613
614 /*
615 * If the member type is not defined in the same CTF container as the
616 * one associated with the current scope (i.e. the container for the
617 * struct or union itself) or its parent, copy the member type into
618 * this container and reset dtt to refer to the copied type.
619 */
620 if (dtt.dtt_ctfp != dsp->ds_ctfp &&
621 dtt.dtt_ctfp != ctf_parent_file(dsp->ds_ctfp)) {
622
623 dtt.dtt_type = ctf_add_type(dsp->ds_ctfp,
624 dtt.dtt_ctfp, dtt.dtt_type);
625 dtt.dtt_ctfp = dsp->ds_ctfp;
626
627 if (dtt.dtt_type == CTF_ERR ||
628 ctf_update(dtt.dtt_ctfp) == CTF_ERR) {
629 xyerror(D_UNKNOWN, "failed to copy type of '%s': %s\n",
630 idname, ctf_errmsg(ctf_errno(dtt.dtt_ctfp)));
631 }
632 }
633
634 if (ctf_add_member(dsp->ds_ctfp, dsp->ds_type,
635 ident, dtt.dtt_type) == CTF_ERR) {
636 xyerror(D_UNKNOWN, "failed to define member '%s': %s\n",
637 idname, ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
638 }
639
640 done:
641 free(ident);
642 yypcb->pcb_dstack.ds_ident = NULL;
643 dt_decl_reset();
644 }
645
646 /*ARGSUSED*/
647 static int
648 dt_decl_hasmembers(const char *name, int value, void *private)
649 {
650 return (1); /* abort search and return true if a member exists */
651 }
652
653 dt_decl_t *
654 dt_decl_enum(char *name)
655 {
656 dt_decl_t *ddp = dt_decl_spec(CTF_K_ENUM, name);
657 char n[DT_TYPE_NAMELEN];
658 ctf_file_t *ctfp;
659 ctf_id_t type;
660 uint_t flag;
661
662 if (yypcb->pcb_idepth != 0)
663 ctfp = yypcb->pcb_hdl->dt_cdefs->dm_ctfp;
664 else
665 ctfp = yypcb->pcb_hdl->dt_ddefs->dm_ctfp;
666
667 if (yypcb->pcb_dstack.ds_next != NULL)
668 flag = CTF_ADD_NONROOT;
669 else
670 flag = CTF_ADD_ROOT;
671
672 (void) snprintf(n, sizeof (n), "enum %s", name ? name : "(anon)");
673
674 if (name != NULL && (type = ctf_lookup_by_name(ctfp, n)) != CTF_ERR) {
675 if (ctf_enum_iter(ctfp, type, dt_decl_hasmembers, NULL))
676 xyerror(D_DECL_TYPERED, "type redeclared: %s\n", n);
677 } else if ((type = ctf_add_enum(ctfp, flag, name)) == CTF_ERR) {
678 xyerror(D_UNKNOWN, "failed to define %s: %s\n",
679 n, ctf_errmsg(ctf_errno(ctfp)));
680 }
681
682 ddp->dd_ctfp = ctfp;
683 ddp->dd_type = type;
684
685 dt_scope_push(ctfp, type);
686 return (ddp);
687 }
688
689 void
690 dt_decl_enumerator(char *s, dt_node_t *dnp)
691 {
692 dt_scope_t *dsp = yypcb->pcb_dstack.ds_next;
693 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
694
695 dt_idnode_t *inp;
696 dt_ident_t *idp;
697 char *name;
698 int value;
699
700 name = strdupa(s);
701 free(s);
702
703 if (dsp == NULL)
704 longjmp(yypcb->pcb_jmpbuf, EDT_NOSCOPE);
705
706 assert(dsp->ds_decl->dd_kind == CTF_K_ENUM);
707 value = dsp->ds_enumval + 1; /* default is previous value plus one */
708
709 if (strchr(name, '`') != NULL) {
710 xyerror(D_DECL_SCOPE, "D scoping operator may not be used in "
711 "an enumerator name (%s)\n", name);
712 }
713
714 /*
715 * If the enumerator is being assigned a value, cook and check the node
716 * and then free it after we get the value. We also permit references
717 * to identifiers which are previously defined enumerators in the type.
718 */
719 if (dnp != NULL) {
720 if (dnp->dn_kind != DT_NODE_IDENT || ctf_enum_value(
721 dsp->ds_ctfp, dsp->ds_type, dnp->dn_string, &value) != 0) {
722 dnp = dt_node_cook(dnp, DT_IDFLG_REF);
723
724 if (dnp->dn_kind != DT_NODE_INT) {
725 xyerror(D_DECL_ENCONST, "enumerator '%s' must "
726 "be assigned to an integral constant "
727 "expression\n", name);
728 }
729
730 if ((intmax_t)dnp->dn_value > INT_MAX ||
731 (intmax_t)dnp->dn_value < INT_MIN) {
732 xyerror(D_DECL_ENOFLOW, "enumerator '%s' value "
733 "overflows INT_MAX (%d)\n", name, INT_MAX);
734 }
735
736 value = (int)dnp->dn_value;
737 }
738 dt_node_free(dnp);
739 }
740
741 if (ctf_add_enumerator(dsp->ds_ctfp, dsp->ds_type,
742 name, value) == CTF_ERR || ctf_update(dsp->ds_ctfp) == CTF_ERR) {
743 xyerror(D_UNKNOWN, "failed to define enumerator '%s': %s\n",
744 name, ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
745 }
746
747 dsp->ds_enumval = value; /* save most recent value */
748
749 /*
750 * If the enumerator name matches an identifier in the global scope,
751 * flag this as an error. We only do this for "D" enumerators to
752 * prevent "C" header file enumerators from conflicting with the ever-
753 * growing list of D built-in global variables and inlines. If a "C"
754 * enumerator conflicts with a global identifier, we add the enumerator
755 * but do not insert a corresponding inline (i.e. the D variable wins).
756 */
757 if (dt_idstack_lookup(&yypcb->pcb_globals, name) != NULL) {
758 if (dsp->ds_ctfp == dtp->dt_ddefs->dm_ctfp) {
759 xyerror(D_DECL_IDRED,
760 "identifier redeclared: %s\n", name);
761 } else
762 return;
763 }
764
765 dt_dprintf("add global enumerator %s = %d\n", name, value);
766
767 idp = dt_idhash_insert(dtp->dt_globals, name, DT_IDENT_ENUM,
768 DT_IDFLG_INLINE | DT_IDFLG_REF, 0, _dtrace_defattr, 0,
769 &dt_idops_inline, NULL, dtp->dt_gen);
770
771 if (idp == NULL)
772 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
773
774 yyintprefix = 0;
775 yyintsuffix[0] = '\0';
776 yyintdecimal = 0;
777
778 dnp = dt_node_int(value);
779 dt_node_type_assign(dnp, dsp->ds_ctfp, dsp->ds_type, B_FALSE);
780
781 if ((inp = malloc(sizeof (dt_idnode_t))) == NULL)
782 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
783
784 /*
785 * Remove the INT node from the node allocation list and store it in
786 * din_list and din_root so it persists with and is freed by the ident.
787 */
788 assert(yypcb->pcb_list == dnp);
789 yypcb->pcb_list = dnp->dn_link;
790 dnp->dn_link = NULL;
791
792 bzero(inp, sizeof (dt_idnode_t));
793 inp->din_list = dnp;
794 inp->din_root = dnp;
795
796 idp->di_iarg = inp;
797 idp->di_ctfp = dsp->ds_ctfp;
798 idp->di_type = dsp->ds_type;
799 }
800
801 /*
802 * Look up the type corresponding to the specified decl stack. The scoping of
803 * the underlying type names is handled by dt_type_lookup(). We build up the
804 * name from the specified string and prefixes and then lookup the type. If
805 * we fail, an errmsg is saved and the caller must abort with EDT_COMPILER.
806 */
807 int
808 dt_decl_type(dt_decl_t *ddp, dtrace_typeinfo_t *tip)
809 {
810 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
811
812 dt_module_t *dmp;
813 ctf_arinfo_t r;
814 ctf_id_t type;
815
816 char n[DT_TYPE_NAMELEN];
817 uint_t flag;
818 char *name;
819 int rv;
820
821 tip->dtt_flags = 0;
822
823 /*
824 * Based on our current #include depth and decl stack depth, determine
825 * which dynamic CTF module and scope to use when adding any new types.
826 */
827 dmp = yypcb->pcb_idepth ? dtp->dt_cdefs : dtp->dt_ddefs;
828 flag = yypcb->pcb_dstack.ds_next ? CTF_ADD_NONROOT : CTF_ADD_ROOT;
829
830 if (ddp->dd_attr & DT_DA_USER)
831 tip->dtt_flags = DTT_FL_USER;
832
833 /*
834 * If we have already cached a CTF type for this decl, then we just
835 * return the type information for the cached type.
836 */
837 if (ddp->dd_ctfp != NULL &&
838 (dmp = dt_module_lookup_by_ctf(dtp, ddp->dd_ctfp)) != NULL) {
839 tip->dtt_object = dmp->dm_name;
840 tip->dtt_ctfp = ddp->dd_ctfp;
841 tip->dtt_type = ddp->dd_type;
842 return (0);
843 }
844
845 /*
846 * Currently CTF treats all function pointers identically. We cache a
847 * representative ID of kind CTF_K_FUNCTION and just return that type.
848 * If we want to support full function declarations, dd_next refers to
849 * the declaration of the function return type, and the parameter list
850 * should be parsed and hung off a new pointer inside of this decl.
851 */
852 if (ddp->dd_kind == CTF_K_FUNCTION) {
853 tip->dtt_object = dtp->dt_ddefs->dm_name;
854 tip->dtt_ctfp = DT_FUNC_CTFP(dtp);
855 tip->dtt_type = DT_FUNC_TYPE(dtp);
856 return (0);
857 }
858
859 /*
860 * If the decl is a pointer, resolve the rest of the stack by calling
861 * dt_decl_type() recursively and then compute a pointer to the result.
862 * Similar to the code above, we return a cached id for function ptrs.
863 */
864 if (ddp->dd_kind == CTF_K_POINTER) {
865 if (ddp->dd_next->dd_kind == CTF_K_FUNCTION) {
866 tip->dtt_object = dtp->dt_ddefs->dm_name;
867 tip->dtt_ctfp = DT_FPTR_CTFP(dtp);
868 tip->dtt_type = DT_FPTR_TYPE(dtp);
869 return (0);
870 }
871
872 if ((rv = dt_decl_type(ddp->dd_next, tip)) == 0 &&
873 (rv = dt_type_pointer(tip)) != 0) {
874 xywarn(D_UNKNOWN, "cannot find type: %s*: %s\n",
875 dt_type_name(tip->dtt_ctfp, tip->dtt_type,
876 n, sizeof (n)), ctf_errmsg(dtp->dt_ctferr));
877 }
878
879 return (rv);
880 }
881
882 /*
883 * If the decl is an array, we must find the base type and then call
884 * dt_decl_type() recursively and then build an array of the result.
885 * The C and D multi-dimensional array syntax requires that consecutive
886 * array declarations be processed from right-to-left (i.e. top-down
887 * from the perspective of the declaration stack). For example, an
888 * array declaration such as int x[3][5] is stored on the stack as:
889 *
890 * (bottom) NULL <- ( INT "int" ) <- ( ARR [3] ) <- ( ARR [5] ) (top)
891 *
892 * but means that x is declared to be an array of 3 objects each of
893 * which is an array of 5 integers, or in CTF representation:
894 *
895 * type T1:( content=int, nelems=5 ) type T2:( content=T1, nelems=3 )
896 *
897 * For more details, refer to K&R[5.7] and ISO C 6.5.2.1. Rather than
898 * overcomplicate the implementation of dt_decl_type(), we push array
899 * declarations down into the stack in dt_decl_array(), above, so that
900 * by the time dt_decl_type() is called, the decl stack looks like:
901 *
902 * (bottom) NULL <- ( INT "int" ) <- ( ARR [5] ) <- ( ARR [3] ) (top)
903 *
904 * which permits a straightforward recursive descent of the decl stack
905 * to build the corresponding CTF type tree in the appropriate order.
906 */
907 if (ddp->dd_kind == CTF_K_ARRAY) {
908 /*
909 * If the array decl has a parameter list associated with it,
910 * this is an associative array declaration: return <DYN>.
911 */
912 if (ddp->dd_node != NULL &&
913 ddp->dd_node->dn_kind == DT_NODE_TYPE) {
914 tip->dtt_object = dtp->dt_ddefs->dm_name;
915 tip->dtt_ctfp = DT_DYN_CTFP(dtp);
916 tip->dtt_type = DT_DYN_TYPE(dtp);
917 return (0);
918 }
919
920 if ((rv = dt_decl_type(ddp->dd_next, tip)) != 0)
921 return (rv);
922
923 /*
924 * If the array base type is not defined in the target
925 * container or its parent, copy the type to the target
926 * container and reset dtt_ctfp and dtt_type to the copy.
927 */
928 if (tip->dtt_ctfp != dmp->dm_ctfp &&
929 tip->dtt_ctfp != ctf_parent_file(dmp->dm_ctfp)) {
930
931 tip->dtt_type = ctf_add_type(dmp->dm_ctfp,
932 tip->dtt_ctfp, tip->dtt_type);
933 tip->dtt_ctfp = dmp->dm_ctfp;
934
935 if (tip->dtt_type == CTF_ERR ||
936 ctf_update(tip->dtt_ctfp) == CTF_ERR) {
937 xywarn(D_UNKNOWN, "failed to copy type: %s\n",
938 ctf_errmsg(ctf_errno(tip->dtt_ctfp)));
939 return (-1);
940 }
941 }
942
943 /*
944 * The array index type is irrelevant in C and D: just set it
945 * to "long" for all array types that we create on-the-fly.
946 */
947 r.ctr_contents = tip->dtt_type;
948 r.ctr_index = ctf_lookup_by_name(tip->dtt_ctfp, "long");
949 r.ctr_nelems = ddp->dd_node ?
950 (uint_t)ddp->dd_node->dn_value : 0;
951
952 tip->dtt_object = dmp->dm_name;
953 tip->dtt_ctfp = dmp->dm_ctfp;
954 tip->dtt_type = ctf_add_array(dmp->dm_ctfp, CTF_ADD_ROOT, &r);
955
956 if (tip->dtt_type == CTF_ERR ||
957 ctf_update(tip->dtt_ctfp) == CTF_ERR) {
958 xywarn(D_UNKNOWN, "failed to create array type: %s\n",
959 ctf_errmsg(ctf_errno(tip->dtt_ctfp)));
960 return (-1);
961 }
962
963 return (0);
964 }
965
966 /*
967 * Allocate space for the type name and enough space for the maximum
968 * additional text ("unsigned long long \0" requires 20 more bytes).
969 */
970 name = alloca(ddp->dd_name ? strlen(ddp->dd_name) + 20 : 20);
971 name[0] = '\0';
972
973 switch (ddp->dd_kind) {
974 case CTF_K_INTEGER:
975 case CTF_K_FLOAT:
976 if (ddp->dd_attr & DT_DA_SIGNED)
977 (void) strcat(name, "signed ");
978 if (ddp->dd_attr & DT_DA_UNSIGNED)
979 (void) strcat(name, "unsigned ");
980 if (ddp->dd_attr & DT_DA_SHORT)
981 (void) strcat(name, "short ");
982 if (ddp->dd_attr & DT_DA_LONG)
983 (void) strcat(name, "long ");
984 if (ddp->dd_attr & DT_DA_LONGLONG)
985 (void) strcat(name, "long long ");
986 if (ddp->dd_attr == 0 && ddp->dd_name == NULL)
987 (void) strcat(name, "int");
988 break;
989 case CTF_K_STRUCT:
990 (void) strcpy(name, "struct ");
991 break;
992 case CTF_K_UNION:
993 (void) strcpy(name, "union ");
994 break;
995 case CTF_K_ENUM:
996 (void) strcpy(name, "enum ");
997 break;
998 case CTF_K_TYPEDEF:
999 break;
1000 default:
1001 xywarn(D_UNKNOWN, "internal error -- "
1002 "bad decl kind %u\n", ddp->dd_kind);
1003 return (-1);
1004 }
1005
1006 /*
1007 * Add dd_name unless a short, long, or long long is explicitly
1008 * suffixed by int. We use the C/CTF canonical names for integers.
1009 */
1010 if (ddp->dd_name != NULL && (ddp->dd_kind != CTF_K_INTEGER ||
1011 (ddp->dd_attr & (DT_DA_SHORT | DT_DA_LONG | DT_DA_LONGLONG)) == 0))
1012 (void) strcat(name, ddp->dd_name);
1013
1014 /*
1015 * Lookup the type. If we find it, we're done. Otherwise create a
1016 * forward tag for the type if it is a struct, union, or enum. If
1017 * we can't find it and we can't create a tag, return failure.
1018 */
1019 if ((rv = dt_type_lookup(name, tip)) == 0)
1020 return (rv);
1021
1022 switch (ddp->dd_kind) {
1023 case CTF_K_STRUCT:
1024 case CTF_K_UNION:
1025 case CTF_K_ENUM:
1026 type = ctf_add_forward(dmp->dm_ctfp, flag,
1027 ddp->dd_name, ddp->dd_kind);
1028 break;
1029 default:
1030 xywarn(D_UNKNOWN, "failed to resolve type %s: %s\n", name,
1031 dtrace_errmsg(dtp, dtrace_errno(dtp)));
1032 return (rv);
1033 }
1034
1035 if (type == CTF_ERR || ctf_update(dmp->dm_ctfp) == CTF_ERR) {
1036 xywarn(D_UNKNOWN, "failed to add forward tag for %s: %s\n",
1037 name, ctf_errmsg(ctf_errno(dmp->dm_ctfp)));
1038 return (-1);
1039 }
1040
1041 ddp->dd_ctfp = dmp->dm_ctfp;
1042 ddp->dd_type = type;
1043
1044 tip->dtt_object = dmp->dm_name;
1045 tip->dtt_ctfp = dmp->dm_ctfp;
1046 tip->dtt_type = type;
1047
1048 return (0);
1049 }
1050
1051 void
1052 dt_scope_create(dt_scope_t *dsp)
1053 {
1054 dsp->ds_decl = NULL;
1055 dsp->ds_next = NULL;
1056 dsp->ds_ident = NULL;
1057 dsp->ds_ctfp = NULL;
1058 dsp->ds_type = CTF_ERR;
1059 dsp->ds_class = DT_DC_DEFAULT;
1060 dsp->ds_enumval = -1;
1061 }
1062
1063 void
1064 dt_scope_destroy(dt_scope_t *dsp)
1065 {
1066 dt_scope_t *nsp;
1067
1068 for (; dsp != NULL; dsp = nsp) {
1069 dt_decl_free(dsp->ds_decl);
1070 free(dsp->ds_ident);
1071 nsp = dsp->ds_next;
1072 if (dsp != &yypcb->pcb_dstack)
1073 free(dsp);
1074 }
1075 }
1076
1077 void
1078 dt_scope_push(ctf_file_t *ctfp, ctf_id_t type)
1079 {
1080 dt_scope_t *rsp = &yypcb->pcb_dstack;
1081 dt_scope_t *dsp = malloc(sizeof (dt_scope_t));
1082
1083 if (dsp == NULL)
1084 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
1085
1086 dsp->ds_decl = rsp->ds_decl;
1087 dsp->ds_next = rsp->ds_next;
1088 dsp->ds_ident = rsp->ds_ident;
1089 dsp->ds_ctfp = ctfp;
1090 dsp->ds_type = type;
1091 dsp->ds_class = rsp->ds_class;
1092 dsp->ds_enumval = rsp->ds_enumval;
1093
1094 dt_scope_create(rsp);
1095 rsp->ds_next = dsp;
1096 }
1097
1098 dt_decl_t *
1099 dt_scope_pop(void)
1100 {
1101 dt_scope_t *rsp = &yypcb->pcb_dstack;
1102 dt_scope_t *dsp = rsp->ds_next;
1103
1104 if (dsp == NULL)
1105 longjmp(yypcb->pcb_jmpbuf, EDT_NOSCOPE);
1106
1107 if (dsp->ds_ctfp != NULL && ctf_update(dsp->ds_ctfp) == CTF_ERR) {
1108 xyerror(D_UNKNOWN, "failed to update type definitions: %s\n",
1109 ctf_errmsg(ctf_errno(dsp->ds_ctfp)));
1110 }
1111
1112 dt_decl_free(rsp->ds_decl);
1113 free(rsp->ds_ident);
1114
1115 rsp->ds_decl = dsp->ds_decl;
1116 rsp->ds_next = dsp->ds_next;
1117 rsp->ds_ident = dsp->ds_ident;
1118 rsp->ds_ctfp = dsp->ds_ctfp;
1119 rsp->ds_type = dsp->ds_type;
1120 rsp->ds_class = dsp->ds_class;
1121 rsp->ds_enumval = dsp->ds_enumval;
1122
1123 free(dsp);
1124 return (rsp->ds_decl);
1125 }