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