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 2008 Sun Microsystems, Inc. All rights reserved.
24 * Copyright (c) 2011, Joyent Inc. All rights reserved.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include <assert.h>
30 #include <strings.h>
31 #ifdef illumos
32 #include <alloca.h>
33 #endif
34 #include <fcntl.h>
35 #include <stdlib.h>
36 #include <stdio.h>
37
38 #include <sys/types.h>
39 #include <sys/sysctl.h>
40 #include <sys/stat.h>
41
42 #include <dt_parser.h>
43 #include <dt_impl.h>
44 #include <dt_provider.h>
45 #include <dt_module.h>
46
47 /*
48 * This callback function is installed in a given identifier hash to search for
49 * and apply deferred pragmas that are pending for a given new identifier name.
50 * Multiple pragmas may be pending for a given name; we processs all of them.
51 */
52 /*ARGSUSED*/
53 static void
dt_pragma_apply(dt_idhash_t * dhp,dt_ident_t * idp)54 dt_pragma_apply(dt_idhash_t *dhp, dt_ident_t *idp)
55 {
56 dt_idhash_t *php;
57 dt_ident_t *pdp;
58
59 if ((php = yypcb->pcb_pragmas) == NULL)
60 return; /* no pragmas pending for current compilation pass */
61
62 while ((pdp = dt_idhash_lookup(php, idp->di_name)) != NULL) {
63 switch (pdp->di_kind) {
64 case DT_IDENT_PRAGAT:
65 idp->di_attr = pdp->di_attr;
66 break;
67 case DT_IDENT_PRAGBN:
68 idp->di_vers = pdp->di_vers;
69 break;
70 }
71 dt_idhash_delete(php, pdp);
72 }
73 }
74
75 /*
76 * The #pragma attributes directive can be used to reset stability attributes
77 * on a global identifier or inline definition. If the identifier is already
78 * defined, we can just change di_attr. If not, we insert the pragma into a
79 * hash table of the current pcb's deferred pragmas for later processing.
80 */
81 static void
dt_pragma_attributes(const char * prname,dt_node_t * dnp)82 dt_pragma_attributes(const char *prname, dt_node_t *dnp)
83 {
84 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
85 dtrace_attribute_t attr, *a;
86 dt_provider_t *pvp;
87 const char *name, *part;
88 dt_ident_t *idp;
89
90 if (dnp == NULL || dnp->dn_kind != DT_NODE_IDENT ||
91 dnp->dn_list == NULL || dnp->dn_list->dn_kind != DT_NODE_IDENT) {
92 xyerror(D_PRAGMA_MALFORM, "malformed #pragma %s "
93 "<attributes> <ident>\n", prname);
94 }
95
96 if (dtrace_str2attr(dnp->dn_string, &attr) == -1) {
97 xyerror(D_PRAGMA_INVAL, "invalid attributes "
98 "specified by #pragma %s\n", prname);
99 }
100
101 dnp = dnp->dn_list;
102 name = dnp->dn_string;
103
104 if (strcmp(name, "provider") == 0) {
105 dnp = dnp->dn_list;
106 name = dnp->dn_string;
107
108 dnp = dnp->dn_list;
109 part = dnp->dn_string;
110
111 if ((pvp = dt_provider_lookup(dtp, name)) != NULL) {
112 if (strcmp(part, "provider") == 0) {
113 a = &pvp->pv_desc.dtvd_attr.dtpa_provider;
114 } else if (strcmp(part, "module") == 0) {
115 a = &pvp->pv_desc.dtvd_attr.dtpa_mod;
116 } else if (strcmp(part, "function") == 0) {
117 a = &pvp->pv_desc.dtvd_attr.dtpa_func;
118 } else if (strcmp(part, "name") == 0) {
119 a = &pvp->pv_desc.dtvd_attr.dtpa_name;
120 } else if (strcmp(part, "args") == 0) {
121 a = &pvp->pv_desc.dtvd_attr.dtpa_args;
122 } else {
123 xyerror(D_PRAGMA_INVAL, "invalid component "
124 "\"%s\" in attribute #pragma "
125 "for provider %s\n", name, part);
126 }
127
128 *a = attr;
129 return;
130 }
131
132 } else if ((idp = dt_idstack_lookup(
133 &yypcb->pcb_globals, name)) != NULL) {
134
135 if (idp->di_gen != dtp->dt_gen) {
136 xyerror(D_PRAGMA_SCOPE, "#pragma %s cannot modify "
137 "entity defined outside program scope\n", prname);
138 }
139
140 idp->di_attr = attr;
141 return;
142 }
143
144 if (yypcb->pcb_pragmas == NULL && (yypcb->pcb_pragmas =
145 dt_idhash_create("pragma", NULL, 0, 0)) == NULL)
146 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
147
148 idp = dt_idhash_insert(yypcb->pcb_pragmas, name, DT_IDENT_PRAGAT, 0, 0,
149 attr, 0, &dt_idops_thaw, (void *)prname, dtp->dt_gen);
150
151 if (idp == NULL)
152 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
153
154 if (dtp->dt_globals->dh_defer == NULL)
155 dtp->dt_globals->dh_defer = &dt_pragma_apply;
156 }
157
158 /*
159 * The #pragma binding directive can be used to reset the version binding
160 * on a global identifier or inline definition. If the identifier is already
161 * defined, we can just change di_vers. If not, we insert the pragma into a
162 * hash table of the current pcb's deferred pragmas for later processing.
163 */
164 static void
dt_pragma_binding(const char * prname,dt_node_t * dnp)165 dt_pragma_binding(const char *prname, dt_node_t *dnp)
166 {
167 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
168 dt_version_t vers;
169 const char *name;
170 dt_ident_t *idp;
171
172 if (dnp == NULL || dnp->dn_kind != DT_NODE_STRING ||
173 dnp->dn_list == NULL || dnp->dn_list->dn_kind != DT_NODE_IDENT) {
174 xyerror(D_PRAGMA_MALFORM, "malformed #pragma %s "
175 "\"version\" <ident>\n", prname);
176 }
177
178 if (dt_version_str2num(dnp->dn_string, &vers) == -1) {
179 xyerror(D_PRAGMA_INVAL, "invalid version string "
180 "specified by #pragma %s\n", prname);
181 }
182
183 name = dnp->dn_list->dn_string;
184 idp = dt_idstack_lookup(&yypcb->pcb_globals, name);
185
186 if (idp != NULL) {
187 if (idp->di_gen != dtp->dt_gen) {
188 xyerror(D_PRAGMA_SCOPE, "#pragma %s cannot modify "
189 "entity defined outside program scope\n", prname);
190 }
191 idp->di_vers = vers;
192 return;
193 }
194
195 if (yypcb->pcb_pragmas == NULL && (yypcb->pcb_pragmas =
196 dt_idhash_create("pragma", NULL, 0, 0)) == NULL)
197 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
198
199 idp = dt_idhash_insert(yypcb->pcb_pragmas, name, DT_IDENT_PRAGBN, 0, 0,
200 _dtrace_defattr, vers, &dt_idops_thaw, (void *)prname, dtp->dt_gen);
201
202 if (idp == NULL)
203 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
204
205 if (dtp->dt_globals->dh_defer == NULL)
206 dtp->dt_globals->dh_defer = &dt_pragma_apply;
207 }
208
209 static void
dt_pragma_depends_finddep(dtrace_hdl_t * dtp,const char * lname,char * lib,size_t len)210 dt_pragma_depends_finddep(dtrace_hdl_t *dtp, const char *lname, char *lib,
211 size_t len)
212 {
213 dt_dirpath_t *dirp;
214 struct stat sbuf;
215 int found = 0;
216
217 for (dirp = dt_list_next(&dtp->dt_lib_path); dirp != NULL;
218 dirp = dt_list_next(dirp)) {
219 (void) snprintf(lib, len, "%s/%s", dirp->dir_path, lname);
220
221 if (stat(lib, &sbuf) == 0) {
222 found = 1;
223 break;
224 }
225 }
226
227 if (!found)
228 xyerror(D_PRAGMA_DEPEND,
229 "failed to find dependency in libpath: %s", lname);
230 }
231
232 /*
233 * The #pragma depends_on directive can be used to express a dependency on a
234 * module, provider or library which if not present will cause processing to
235 * abort.
236 */
237 static void
dt_pragma_depends(const char * prname,dt_node_t * cnp)238 dt_pragma_depends(const char *prname, dt_node_t *cnp)
239 {
240 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
241 dt_node_t *nnp = cnp ? cnp->dn_list : NULL;
242 int found;
243 dt_lib_depend_t *dld;
244 char lib[MAXPATHLEN];
245 size_t plen;
246 char *provs, *cpy, *tok;
247
248 if (cnp == NULL || nnp == NULL ||
249 cnp->dn_kind != DT_NODE_IDENT || nnp->dn_kind != DT_NODE_IDENT) {
250 xyerror(D_PRAGMA_MALFORM, "malformed #pragma %s "
251 "<class> <name>\n", prname);
252 }
253
254 if (strcmp(cnp->dn_string, "provider") == 0) {
255 /*
256 * First try to get the provider list using the
257 * debug.dtrace.providers sysctl, since that'll work even if
258 * we're not running as root.
259 */
260 provs = NULL;
261 if (sysctlbyname("debug.dtrace.providers", NULL, &plen, NULL, 0) ||
262 ((provs = dt_alloc(dtp, plen)) == NULL) ||
263 sysctlbyname("debug.dtrace.providers", provs, &plen, NULL, 0))
264 found = dt_provider_lookup(dtp, nnp->dn_string) != NULL;
265 else {
266 found = B_FALSE;
267 for (cpy = provs; (tok = strsep(&cpy, " ")) != NULL; )
268 if (strcmp(tok, nnp->dn_string) == 0) {
269 found = B_TRUE;
270 break;
271 }
272 if (found == B_FALSE)
273 found = dt_provider_lookup(dtp,
274 nnp->dn_string) != NULL;
275 }
276 if (provs != NULL)
277 dt_free(dtp, provs);
278 } else if (strcmp(cnp->dn_string, "module") == 0) {
279 dt_module_t *mp = dt_module_lookup_by_name(dtp, nnp->dn_string);
280 found = mp != NULL && dt_module_getctf(dtp, mp) != NULL;
281 #ifdef __FreeBSD__
282 if (!found) {
283 dt_kmodule_t *dkmp = dt_kmodule_lookup(dtp,
284 nnp->dn_string);
285 found = dkmp != NULL &&
286 dt_module_getctf(dtp, dkmp->dkm_module) != NULL;
287 }
288 #endif
289 } else if (strcmp(cnp->dn_string, "library") == 0) {
290 if (yypcb->pcb_cflags & DTRACE_C_CTL) {
291 assert(dtp->dt_filetag != NULL);
292
293 dt_pragma_depends_finddep(dtp, nnp->dn_string, lib,
294 sizeof (lib));
295
296 dld = dt_lib_depend_lookup(&dtp->dt_lib_dep,
297 dtp->dt_filetag);
298 assert(dld != NULL);
299
300 if ((dt_lib_depend_add(dtp, &dld->dtld_dependencies,
301 lib)) != 0) {
302 xyerror(D_PRAGMA_DEPEND,
303 "failed to add dependency %s:%s\n", lib,
304 dtrace_errmsg(dtp, dtrace_errno(dtp)));
305 }
306 } else {
307 /*
308 * By this point we have already performed a topological
309 * sort of the dependencies; we process this directive
310 * as satisfied as long as the dependency was properly
311 * loaded.
312 */
313 if (dtp->dt_filetag == NULL)
314 xyerror(D_PRAGMA_DEPEND, "main program may "
315 "not explicitly depend on a library");
316
317 dld = dt_lib_depend_lookup(&dtp->dt_lib_dep,
318 dtp->dt_filetag);
319 assert(dld != NULL);
320
321 dt_pragma_depends_finddep(dtp, nnp->dn_string, lib,
322 sizeof (lib));
323 dld = dt_lib_depend_lookup(&dtp->dt_lib_dep_sorted,
324 lib);
325 assert(dld != NULL);
326
327 if (!dld->dtld_loaded)
328 xyerror(D_PRAGMA_DEPEND, "program requires "
329 "library \"%s\" which failed to load",
330 lib);
331 }
332
333 found = B_TRUE;
334 } else {
335 xyerror(D_PRAGMA_INVAL, "invalid class %s "
336 "specified by #pragma %s\n", cnp->dn_string, prname);
337 }
338
339 if (!found) {
340 xyerror(D_PRAGMA_DEPEND, "program requires %s %s\n",
341 cnp->dn_string, nnp->dn_string);
342 }
343 }
344
345 /*
346 * The #pragma error directive can be followed by any list of tokens, which we
347 * just concatenate and print as part of our error message.
348 */
349 static void
dt_pragma_error(const char * prname,dt_node_t * dnp)350 dt_pragma_error(const char *prname, dt_node_t *dnp)
351 {
352 dt_node_t *enp;
353 size_t n = 0;
354 char *s;
355
356 for (enp = dnp; enp != NULL; enp = enp->dn_list) {
357 if (enp->dn_kind == DT_NODE_IDENT ||
358 enp->dn_kind == DT_NODE_STRING)
359 n += strlen(enp->dn_string) + 1;
360 }
361
362 s = alloca(n + 1);
363 s[0] = '\0';
364
365 for (enp = dnp; enp != NULL; enp = enp->dn_list) {
366 if (enp->dn_kind == DT_NODE_IDENT ||
367 enp->dn_kind == DT_NODE_STRING) {
368 (void) strcat(s, enp->dn_string);
369 (void) strcat(s, " ");
370 }
371 }
372
373 xyerror(D_PRAGERR, "#%s: %s\n", prname, s);
374 }
375
376 /*ARGSUSED*/
377 static void
dt_pragma_ident(const char * prname,dt_node_t * dnp)378 dt_pragma_ident(const char *prname, dt_node_t *dnp)
379 {
380 /* ignore any #ident or #pragma ident lines */
381 }
382
383 static void
dt_pragma_option(const char * prname,dt_node_t * dnp)384 dt_pragma_option(const char *prname, dt_node_t *dnp)
385 {
386 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
387 char *opt, *val;
388
389 if (dnp == NULL || dnp->dn_kind != DT_NODE_IDENT) {
390 xyerror(D_PRAGMA_MALFORM,
391 "malformed #pragma %s <option>=<val>\n", prname);
392 }
393
394 if (dnp->dn_list != NULL) {
395 xyerror(D_PRAGMA_MALFORM,
396 "superfluous arguments specified for #pragma %s\n", prname);
397 }
398
399 opt = alloca(strlen(dnp->dn_string) + 1);
400 (void) strcpy(opt, dnp->dn_string);
401
402 if ((val = strchr(opt, '=')) != NULL)
403 *val++ = '\0';
404
405 if (dtrace_setopt(dtp, opt, val) == -1) {
406 if (val == NULL) {
407 xyerror(D_PRAGMA_OPTSET,
408 "failed to set option '%s': %s\n", opt,
409 dtrace_errmsg(dtp, dtrace_errno(dtp)));
410 } else {
411 xyerror(D_PRAGMA_OPTSET,
412 "failed to set option '%s' to '%s': %s\n",
413 opt, val, dtrace_errmsg(dtp, dtrace_errno(dtp)));
414 }
415 }
416 }
417
418 /*
419 * The #line directive is used to reset the input line number and to optionally
420 * note the file name for use in error messages. Sun cpp(1) also produces a
421 * third integer token after the filename which is one of the following:
422 *
423 * 0 - line change has nothing to do with an #include file
424 * 1 - line change because we just entered a #include file
425 * 2 - line change because we just exited a #include file
426 *
427 * We use these state tokens to adjust pcb_idepth, which in turn controls
428 * whether type lookups access the global type space or not.
429 */
430 static void
dt_pragma_line(const char * prname,dt_node_t * dnp)431 dt_pragma_line(const char *prname, dt_node_t *dnp)
432 {
433 dt_node_t *fnp = dnp ? dnp->dn_list : NULL;
434 dt_node_t *inp = fnp ? fnp->dn_list : NULL;
435
436 if ((dnp == NULL || dnp->dn_kind != DT_NODE_INT) ||
437 (fnp != NULL && fnp->dn_kind != DT_NODE_STRING) ||
438 (inp != NULL && inp->dn_kind != DT_NODE_INT)) {
439 xyerror(D_PRAGMA_MALFORM, "malformed #%s "
440 "<line> [ [\"file\"] state ]\n", prname);
441 }
442
443 /*
444 * If a file is specified, free any old pcb_filetag and swap fnp's
445 * dn_string into pcb_filetag as the new filename for error messages.
446 */
447 if (fnp != NULL) {
448 if (yypcb->pcb_filetag != NULL)
449 free(yypcb->pcb_filetag);
450
451 /*
452 * This is not pretty, but is a necessary evil until we either
453 * write "dpp" or get a useful standalone cpp from DevPro. If
454 * the filename begins with /dev/fd, we know it's the master
455 * input file (see dt_preproc() in dt_cc.c), so just clear the
456 * dt_filetag pointer so error messages refer to the main file.
457 */
458 if (strncmp(fnp->dn_string, "/dev/fd/", 8) != 0) {
459 yypcb->pcb_filetag = fnp->dn_string;
460 fnp->dn_string = NULL;
461 } else
462 yypcb->pcb_filetag = NULL;
463 }
464
465 if (inp != NULL) {
466 if (inp->dn_value == 1)
467 yypcb->pcb_idepth++;
468 else if (inp->dn_value == 2 && yypcb->pcb_idepth != 0)
469 yypcb->pcb_idepth--;
470 }
471
472 yylineno = dnp->dn_value;
473 }
474
475 /*
476 * D compiler pragma types range from control directives to common pragmas to
477 * D custom pragmas, in order of specificity. Similar to gcc, we use #pragma D
478 * as a special prefix for our pragmas so they can be used in mixed headers.
479 */
480 #define DT_PRAGMA_DIR 0 /* pragma directive may be used after naked # */
481 #define DT_PRAGMA_SUB 1 /* pragma directive may be used after #pragma */
482 #define DT_PRAGMA_DCP 2 /* pragma may only be used after #pragma D */
483
484 static const struct dt_pragmadesc {
485 const char *dpd_name;
486 void (*dpd_func)(const char *, dt_node_t *);
487 int dpd_kind;
488 } dt_pragmas[] = {
489 { "attributes", dt_pragma_attributes, DT_PRAGMA_DCP },
490 { "binding", dt_pragma_binding, DT_PRAGMA_DCP },
491 { "depends_on", dt_pragma_depends, DT_PRAGMA_DCP },
492 { "error", dt_pragma_error, DT_PRAGMA_DIR },
493 { "ident", dt_pragma_ident, DT_PRAGMA_DIR },
494 { "line", dt_pragma_line, DT_PRAGMA_DIR },
495 { "option", dt_pragma_option, DT_PRAGMA_DCP },
496 { NULL, NULL }
497 };
498
499 /*
500 * Process a control line #directive by looking up the directive name in our
501 * lookup table and invoking the corresponding function with the token list.
502 * According to K&R[A12.9], we silently ignore null directive lines.
503 */
504 void
dt_pragma(dt_node_t * pnp)505 dt_pragma(dt_node_t *pnp)
506 {
507 const struct dt_pragmadesc *dpd;
508 dt_node_t *dnp;
509 int kind = DT_PRAGMA_DIR;
510
511 for (dnp = pnp; dnp != NULL; dnp = dnp->dn_list) {
512 if (dnp->dn_kind == DT_NODE_INT) {
513 dt_pragma_line("line", dnp);
514 break;
515 }
516
517 if (dnp->dn_kind != DT_NODE_IDENT)
518 xyerror(D_PRAGCTL_INVAL, "invalid control directive\n");
519
520 if (kind == DT_PRAGMA_DIR &&
521 strcmp(dnp->dn_string, "pragma") == 0) {
522 kind = DT_PRAGMA_SUB;
523 continue;
524 }
525
526 if (kind == DT_PRAGMA_SUB &&
527 strcmp(dnp->dn_string, "D") == 0) {
528 kind = DT_PRAGMA_DCP;
529 continue;
530 }
531
532 for (dpd = dt_pragmas; dpd->dpd_name != NULL; dpd++) {
533 if (dpd->dpd_kind <= kind &&
534 strcmp(dpd->dpd_name, dnp->dn_string) == 0)
535 break;
536 }
537
538 yylineno--; /* since we've already seen \n */
539
540 if (dpd->dpd_name != NULL) {
541 dpd->dpd_func(dpd->dpd_name, dnp->dn_list);
542 yylineno++;
543 break;
544 }
545
546 switch (kind) {
547 case DT_PRAGMA_DIR:
548 xyerror(D_PRAGCTL_INVAL, "invalid control directive: "
549 "#%s\n", dnp->dn_string);
550 /*NOTREACHED*/
551 case DT_PRAGMA_SUB:
552 break; /* K&R[A12.8] says to ignore unknown pragmas */
553 case DT_PRAGMA_DCP:
554 default:
555 xyerror(D_PRAGMA_INVAL, "invalid D pragma: %s\n",
556 dnp->dn_string);
557 }
558
559 yylineno++;
560 break;
561 }
562
563 dt_node_list_free(&pnp);
564 }
565