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) 2011, 2016 by Delphix. All rights reserved.
25 * Copyright (c) 2013, Joyent Inc. All rights reserved.
26 * Copyright 2015 Gary Mills
27 */
28
29 /*
30 * DTrace D Language Compiler
31 *
32 * The code in this source file implements the main engine for the D language
33 * compiler. The driver routine for the compiler is dt_compile(), below. The
34 * compiler operates on either stdio FILEs or in-memory strings as its input
35 * and can produce either dtrace_prog_t structures from a D program or a single
36 * dtrace_difo_t structure from a D expression. Multiple entry points are
37 * provided as wrappers around dt_compile() for the various input/output pairs.
38 * The compiler itself is implemented across the following source files:
39 *
40 * dt_lex.l - lex scanner
41 * dt_grammar.y - yacc grammar
42 * dt_parser.c - parse tree creation and semantic checking
43 * dt_decl.c - declaration stack processing
44 * dt_xlator.c - D translator lookup and creation
45 * dt_ident.c - identifier and symbol table routines
46 * dt_pragma.c - #pragma processing and D pragmas
47 * dt_printf.c - D printf() and printa() argument checking and processing
48 * dt_cc.c - compiler driver and dtrace_prog_t construction
49 * dt_cg.c - DIF code generator
50 * dt_as.c - DIF assembler
51 * dt_dof.c - dtrace_prog_t -> DOF conversion
52 *
53 * Several other source files provide collections of utility routines used by
54 * these major files. The compiler itself is implemented in multiple passes:
55 *
56 * (1) The input program is scanned and parsed by dt_lex.l and dt_grammar.y
57 * and parse tree nodes are constructed using the routines in dt_parser.c.
58 * This node construction pass is described further in dt_parser.c.
59 *
60 * (2) The parse tree is "cooked" by assigning each clause a context (see the
61 * routine dt_setcontext(), below) based on its probe description and then
62 * recursively descending the tree performing semantic checking. The cook
63 * routines are also implemented in dt_parser.c and described there.
64 *
65 * (3) For actions that are DIF expression statements, the DIF code generator
66 * and assembler are invoked to create a finished DIFO for the statement.
67 *
68 * (4) The dtrace_prog_t data structures for the program clauses and actions
69 * are built, containing pointers to any DIFOs created in step (3).
70 *
71 * (5) The caller invokes a routine in dt_dof.c to convert the finished program
72 * into DOF format for use in anonymous tracing or enabling in the kernel.
73 *
74 * In the implementation, steps 2-4 are intertwined in that they are performed
75 * in order for each clause as part of a loop that executes over the clauses.
76 *
77 * The D compiler currently implements nearly no optimization. The compiler
78 * implements integer constant folding as part of pass (1), and a set of very
79 * simple peephole optimizations as part of pass (3). As with any C compiler,
80 * a large number of optimizations are possible on both the intermediate data
81 * structures and the generated DIF code. These possibilities should be
82 * investigated in the context of whether they will have any substantive effect
83 * on the overall DTrace probe effect before they are undertaken.
84 */
85
86 #include <sys/types.h>
87 #include <sys/wait.h>
88 #include <sys/sysmacros.h>
89
90 #include <assert.h>
91 #include <string.h>
92 #include <strings.h>
93 #include <signal.h>
94 #include <unistd.h>
95 #include <stdlib.h>
96 #include <stdio.h>
97 #include <errno.h>
98 #include <ucontext.h>
99 #include <limits.h>
100 #include <ctype.h>
101 #include <dirent.h>
102 #include <dt_module.h>
103 #include <dt_program.h>
104 #include <dt_provider.h>
105 #include <dt_printf.h>
106 #include <dt_pid.h>
107 #include <dt_grammar.h>
108 #include <dt_ident.h>
109 #include <dt_string.h>
110 #include <dt_impl.h>
111
112 static const dtrace_diftype_t dt_void_rtype = {
113 DIF_TYPE_CTF, CTF_K_INTEGER, 0, 0, 0
114 };
115
116 static const dtrace_diftype_t dt_int_rtype = {
117 DIF_TYPE_CTF, CTF_K_INTEGER, 0, 0, sizeof (uint64_t)
118 };
119
120 static void *dt_compile(dtrace_hdl_t *, int, dtrace_probespec_t, void *,
121 uint_t, int, char *const[], FILE *, const char *);
122
123 /*ARGSUSED*/
124 static int
dt_idreset(dt_idhash_t * dhp,dt_ident_t * idp,void * ignored)125 dt_idreset(dt_idhash_t *dhp, dt_ident_t *idp, void *ignored)
126 {
127 idp->di_flags &= ~(DT_IDFLG_REF | DT_IDFLG_MOD |
128 DT_IDFLG_DIFR | DT_IDFLG_DIFW);
129 return (0);
130 }
131
132 /*ARGSUSED*/
133 static int
dt_idpragma(dt_idhash_t * dhp,dt_ident_t * idp,void * ignored)134 dt_idpragma(dt_idhash_t *dhp, dt_ident_t *idp, void *ignored)
135 {
136 yylineno = idp->di_lineno;
137 xyerror(D_PRAGMA_UNUSED, "unused #pragma %s\n", (char *)idp->di_iarg);
138 return (0);
139 }
140
141 static dtrace_stmtdesc_t *
dt_stmt_create(dtrace_hdl_t * dtp,dtrace_ecbdesc_t * edp,dtrace_attribute_t descattr,dtrace_attribute_t stmtattr)142 dt_stmt_create(dtrace_hdl_t *dtp, dtrace_ecbdesc_t *edp,
143 dtrace_attribute_t descattr, dtrace_attribute_t stmtattr)
144 {
145 dtrace_stmtdesc_t *sdp = dtrace_stmt_create(dtp, edp);
146
147 if (sdp == NULL)
148 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
149
150 assert(yypcb->pcb_stmt == NULL);
151 yypcb->pcb_stmt = sdp;
152
153 sdp->dtsd_descattr = descattr;
154 sdp->dtsd_stmtattr = stmtattr;
155
156 return (sdp);
157 }
158
159 static dtrace_actdesc_t *
dt_stmt_action(dtrace_hdl_t * dtp,dtrace_stmtdesc_t * sdp)160 dt_stmt_action(dtrace_hdl_t *dtp, dtrace_stmtdesc_t *sdp)
161 {
162 dtrace_actdesc_t *new;
163
164 if ((new = dtrace_stmt_action(dtp, sdp)) == NULL)
165 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
166
167 return (new);
168 }
169
170 /*
171 * Utility function to determine if a given action description is destructive.
172 * The dtdo_destructive bit is set for us by the DIF assembler (see dt_as.c).
173 */
174 static int
dt_action_destructive(const dtrace_actdesc_t * ap)175 dt_action_destructive(const dtrace_actdesc_t *ap)
176 {
177 return (DTRACEACT_ISDESTRUCTIVE(ap->dtad_kind) || (ap->dtad_kind ==
178 DTRACEACT_DIFEXPR && ap->dtad_difo->dtdo_destructive));
179 }
180
181 static void
dt_stmt_append(dtrace_stmtdesc_t * sdp,const dt_node_t * dnp)182 dt_stmt_append(dtrace_stmtdesc_t *sdp, const dt_node_t *dnp)
183 {
184 dtrace_ecbdesc_t *edp = sdp->dtsd_ecbdesc;
185 dtrace_actdesc_t *ap, *tap;
186 int commit = 0;
187 int speculate = 0;
188 int datarec = 0;
189
190 /*
191 * Make sure that the new statement jibes with the rest of the ECB.
192 */
193 for (ap = edp->dted_action; ap != NULL; ap = ap->dtad_next) {
194 if (ap->dtad_kind == DTRACEACT_COMMIT) {
195 if (commit) {
196 dnerror(dnp, D_COMM_COMM, "commit( ) may "
197 "not follow commit( )\n");
198 }
199
200 if (datarec) {
201 dnerror(dnp, D_COMM_DREC, "commit( ) may "
202 "not follow data-recording action(s)\n");
203 }
204
205 for (tap = ap; tap != NULL; tap = tap->dtad_next) {
206 if (!DTRACEACT_ISAGG(tap->dtad_kind))
207 continue;
208
209 dnerror(dnp, D_AGG_COMM, "aggregating actions "
210 "may not follow commit( )\n");
211 }
212
213 commit = 1;
214 continue;
215 }
216
217 if (ap->dtad_kind == DTRACEACT_SPECULATE) {
218 if (speculate) {
219 dnerror(dnp, D_SPEC_SPEC, "speculate( ) may "
220 "not follow speculate( )\n");
221 }
222
223 if (commit) {
224 dnerror(dnp, D_SPEC_COMM, "speculate( ) may "
225 "not follow commit( )\n");
226 }
227
228 if (datarec) {
229 dnerror(dnp, D_SPEC_DREC, "speculate( ) may "
230 "not follow data-recording action(s)\n");
231 }
232
233 speculate = 1;
234 continue;
235 }
236
237 if (DTRACEACT_ISAGG(ap->dtad_kind)) {
238 if (speculate) {
239 dnerror(dnp, D_AGG_SPEC, "aggregating actions "
240 "may not follow speculate( )\n");
241 }
242
243 datarec = 1;
244 continue;
245 }
246
247 if (speculate) {
248 if (dt_action_destructive(ap)) {
249 dnerror(dnp, D_ACT_SPEC, "destructive actions "
250 "may not follow speculate( )\n");
251 }
252
253 if (ap->dtad_kind == DTRACEACT_EXIT) {
254 dnerror(dnp, D_EXIT_SPEC, "exit( ) may not "
255 "follow speculate( )\n");
256 }
257 }
258
259 /*
260 * Exclude all non data-recording actions.
261 */
262 if (dt_action_destructive(ap) ||
263 ap->dtad_kind == DTRACEACT_DISCARD)
264 continue;
265
266 if (ap->dtad_kind == DTRACEACT_DIFEXPR &&
267 ap->dtad_difo->dtdo_rtype.dtdt_kind == DIF_TYPE_CTF &&
268 ap->dtad_difo->dtdo_rtype.dtdt_size == 0)
269 continue;
270
271 if (commit) {
272 dnerror(dnp, D_DREC_COMM, "data-recording actions "
273 "may not follow commit( )\n");
274 }
275
276 if (!speculate)
277 datarec = 1;
278 }
279
280 if (dtrace_stmt_add(yypcb->pcb_hdl, yypcb->pcb_prog, sdp) != 0)
281 longjmp(yypcb->pcb_jmpbuf, dtrace_errno(yypcb->pcb_hdl));
282
283 if (yypcb->pcb_stmt == sdp)
284 yypcb->pcb_stmt = NULL;
285 }
286
287 /*
288 * For the first element of an aggregation tuple or for printa(), we create a
289 * simple DIF program that simply returns the immediate value that is the ID
290 * of the aggregation itself. This could be optimized in the future by
291 * creating a new in-kernel dtad_kind that just returns an integer.
292 */
293 static void
dt_action_difconst(dtrace_actdesc_t * ap,uint_t id,dtrace_actkind_t kind)294 dt_action_difconst(dtrace_actdesc_t *ap, uint_t id, dtrace_actkind_t kind)
295 {
296 dtrace_hdl_t *dtp = yypcb->pcb_hdl;
297 dtrace_difo_t *dp = dt_zalloc(dtp, sizeof (dtrace_difo_t));
298
299 if (dp == NULL)
300 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
301
302 dp->dtdo_buf = dt_alloc(dtp, sizeof (dif_instr_t) * 2);
303 dp->dtdo_inttab = dt_alloc(dtp, sizeof (uint64_t));
304
305 if (dp->dtdo_buf == NULL || dp->dtdo_inttab == NULL) {
306 dt_difo_free(dtp, dp);
307 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
308 }
309
310 dp->dtdo_buf[0] = DIF_INSTR_SETX(0, 1); /* setx DIF_INTEGER[0], %r1 */
311 dp->dtdo_buf[1] = DIF_INSTR_RET(1); /* ret %r1 */
312 dp->dtdo_len = 2;
313 dp->dtdo_inttab[0] = id;
314 dp->dtdo_intlen = 1;
315 dp->dtdo_rtype = dt_int_rtype;
316
317 ap->dtad_difo = dp;
318 ap->dtad_kind = kind;
319 }
320
321 static void
dt_action_clear(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)322 dt_action_clear(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
323 {
324 dt_ident_t *aid;
325 dtrace_actdesc_t *ap;
326 dt_node_t *anp;
327
328 char n[DT_TYPE_NAMELEN];
329 int argc = 0;
330
331 for (anp = dnp->dn_args; anp != NULL; anp = anp->dn_list)
332 argc++; /* count up arguments for error messages below */
333
334 if (argc != 1) {
335 dnerror(dnp, D_CLEAR_PROTO,
336 "%s( ) prototype mismatch: %d args passed, 1 expected\n",
337 dnp->dn_ident->di_name, argc);
338 }
339
340 anp = dnp->dn_args;
341 assert(anp != NULL);
342
343 if (anp->dn_kind != DT_NODE_AGG) {
344 dnerror(dnp, D_CLEAR_AGGARG,
345 "%s( ) argument #1 is incompatible with prototype:\n"
346 "\tprototype: aggregation\n\t argument: %s\n",
347 dnp->dn_ident->di_name,
348 dt_node_type_name(anp, n, sizeof (n)));
349 }
350
351 aid = anp->dn_ident;
352
353 if (aid->di_gen == dtp->dt_gen && !(aid->di_flags & DT_IDFLG_MOD)) {
354 dnerror(dnp, D_CLEAR_AGGBAD,
355 "undefined aggregation: @%s\n", aid->di_name);
356 }
357
358 ap = dt_stmt_action(dtp, sdp);
359 dt_action_difconst(ap, anp->dn_ident->di_id, DTRACEACT_LIBACT);
360 ap->dtad_arg = DT_ACT_CLEAR;
361 }
362
363 static void
dt_action_normalize(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)364 dt_action_normalize(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
365 {
366 dt_ident_t *aid;
367 dtrace_actdesc_t *ap;
368 dt_node_t *anp, *normal;
369 int denormal = (strcmp(dnp->dn_ident->di_name, "denormalize") == 0);
370
371 char n[DT_TYPE_NAMELEN];
372 int argc = 0;
373
374 for (anp = dnp->dn_args; anp != NULL; anp = anp->dn_list)
375 argc++; /* count up arguments for error messages below */
376
377 if ((denormal && argc != 1) || (!denormal && argc != 2)) {
378 dnerror(dnp, D_NORMALIZE_PROTO,
379 "%s( ) prototype mismatch: %d args passed, %d expected\n",
380 dnp->dn_ident->di_name, argc, denormal ? 1 : 2);
381 }
382
383 anp = dnp->dn_args;
384 assert(anp != NULL);
385
386 if (anp->dn_kind != DT_NODE_AGG) {
387 dnerror(dnp, D_NORMALIZE_AGGARG,
388 "%s( ) argument #1 is incompatible with prototype:\n"
389 "\tprototype: aggregation\n\t argument: %s\n",
390 dnp->dn_ident->di_name,
391 dt_node_type_name(anp, n, sizeof (n)));
392 }
393
394 if ((normal = anp->dn_list) != NULL && !dt_node_is_scalar(normal)) {
395 dnerror(dnp, D_NORMALIZE_SCALAR,
396 "%s( ) argument #2 must be of scalar type\n",
397 dnp->dn_ident->di_name);
398 }
399
400 aid = anp->dn_ident;
401
402 if (aid->di_gen == dtp->dt_gen && !(aid->di_flags & DT_IDFLG_MOD)) {
403 dnerror(dnp, D_NORMALIZE_AGGBAD,
404 "undefined aggregation: @%s\n", aid->di_name);
405 }
406
407 ap = dt_stmt_action(dtp, sdp);
408 dt_action_difconst(ap, anp->dn_ident->di_id, DTRACEACT_LIBACT);
409
410 if (denormal) {
411 ap->dtad_arg = DT_ACT_DENORMALIZE;
412 return;
413 }
414
415 ap->dtad_arg = DT_ACT_NORMALIZE;
416
417 assert(normal != NULL);
418 ap = dt_stmt_action(dtp, sdp);
419 dt_cg(yypcb, normal);
420
421 ap->dtad_difo = dt_as(yypcb);
422 ap->dtad_kind = DTRACEACT_LIBACT;
423 ap->dtad_arg = DT_ACT_NORMALIZE;
424 }
425
426 static void
dt_action_trunc(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)427 dt_action_trunc(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
428 {
429 dt_ident_t *aid;
430 dtrace_actdesc_t *ap;
431 dt_node_t *anp, *trunc;
432
433 char n[DT_TYPE_NAMELEN];
434 int argc = 0;
435
436 for (anp = dnp->dn_args; anp != NULL; anp = anp->dn_list)
437 argc++; /* count up arguments for error messages below */
438
439 if (argc > 2 || argc < 1) {
440 dnerror(dnp, D_TRUNC_PROTO,
441 "%s( ) prototype mismatch: %d args passed, %s expected\n",
442 dnp->dn_ident->di_name, argc,
443 argc < 1 ? "at least 1" : "no more than 2");
444 }
445
446 anp = dnp->dn_args;
447 assert(anp != NULL);
448 trunc = anp->dn_list;
449
450 if (anp->dn_kind != DT_NODE_AGG) {
451 dnerror(dnp, D_TRUNC_AGGARG,
452 "%s( ) argument #1 is incompatible with prototype:\n"
453 "\tprototype: aggregation\n\t argument: %s\n",
454 dnp->dn_ident->di_name,
455 dt_node_type_name(anp, n, sizeof (n)));
456 }
457
458 if (argc == 2) {
459 assert(trunc != NULL);
460 if (!dt_node_is_scalar(trunc)) {
461 dnerror(dnp, D_TRUNC_SCALAR,
462 "%s( ) argument #2 must be of scalar type\n",
463 dnp->dn_ident->di_name);
464 }
465 }
466
467 aid = anp->dn_ident;
468
469 if (aid->di_gen == dtp->dt_gen && !(aid->di_flags & DT_IDFLG_MOD)) {
470 dnerror(dnp, D_TRUNC_AGGBAD,
471 "undefined aggregation: @%s\n", aid->di_name);
472 }
473
474 ap = dt_stmt_action(dtp, sdp);
475 dt_action_difconst(ap, anp->dn_ident->di_id, DTRACEACT_LIBACT);
476 ap->dtad_arg = DT_ACT_TRUNC;
477
478 ap = dt_stmt_action(dtp, sdp);
479
480 if (argc == 1) {
481 dt_action_difconst(ap, 0, DTRACEACT_LIBACT);
482 } else {
483 assert(trunc != NULL);
484 dt_cg(yypcb, trunc);
485 ap->dtad_difo = dt_as(yypcb);
486 ap->dtad_kind = DTRACEACT_LIBACT;
487 }
488
489 ap->dtad_arg = DT_ACT_TRUNC;
490 }
491
492 static void
dt_action_printa(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)493 dt_action_printa(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
494 {
495 dt_ident_t *aid, *fid;
496 dtrace_actdesc_t *ap;
497 const char *format;
498 dt_node_t *anp, *proto = NULL;
499
500 char n[DT_TYPE_NAMELEN];
501 int argc = 0, argr = 0;
502
503 for (anp = dnp->dn_args; anp != NULL; anp = anp->dn_list)
504 argc++; /* count up arguments for error messages below */
505
506 switch (dnp->dn_args->dn_kind) {
507 case DT_NODE_STRING:
508 format = dnp->dn_args->dn_string;
509 anp = dnp->dn_args->dn_list;
510 argr = 2;
511 break;
512 case DT_NODE_AGG:
513 format = NULL;
514 anp = dnp->dn_args;
515 argr = 1;
516 break;
517 default:
518 format = NULL;
519 anp = dnp->dn_args;
520 argr = 1;
521 }
522
523 if (argc < argr) {
524 dnerror(dnp, D_PRINTA_PROTO,
525 "%s( ) prototype mismatch: %d args passed, %d expected\n",
526 dnp->dn_ident->di_name, argc, argr);
527 }
528
529 assert(anp != NULL);
530
531 while (anp != NULL) {
532 if (anp->dn_kind != DT_NODE_AGG) {
533 dnerror(dnp, D_PRINTA_AGGARG,
534 "%s( ) argument #%d is incompatible with "
535 "prototype:\n\tprototype: aggregation\n"
536 "\t argument: %s\n", dnp->dn_ident->di_name, argr,
537 dt_node_type_name(anp, n, sizeof (n)));
538 }
539
540 aid = anp->dn_ident;
541 fid = aid->di_iarg;
542
543 if (aid->di_gen == dtp->dt_gen &&
544 !(aid->di_flags & DT_IDFLG_MOD)) {
545 dnerror(dnp, D_PRINTA_AGGBAD,
546 "undefined aggregation: @%s\n", aid->di_name);
547 }
548
549 /*
550 * If we have multiple aggregations, we must be sure that
551 * their key signatures match.
552 */
553 if (proto != NULL) {
554 dt_printa_validate(proto, anp);
555 } else {
556 proto = anp;
557 }
558
559 if (format != NULL) {
560 yylineno = dnp->dn_line;
561
562 sdp->dtsd_fmtdata =
563 dt_printf_create(yypcb->pcb_hdl, format);
564 dt_printf_validate(sdp->dtsd_fmtdata,
565 DT_PRINTF_AGGREGATION, dnp->dn_ident, 1,
566 fid->di_id, ((dt_idsig_t *)aid->di_data)->dis_args);
567 format = NULL;
568 }
569
570 ap = dt_stmt_action(dtp, sdp);
571 dt_action_difconst(ap, anp->dn_ident->di_id, DTRACEACT_PRINTA);
572
573 anp = anp->dn_list;
574 argr++;
575 }
576 }
577
578 static void
dt_action_printflike(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp,dtrace_actkind_t kind)579 dt_action_printflike(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp,
580 dtrace_actkind_t kind)
581 {
582 dt_node_t *anp, *arg1;
583 dtrace_actdesc_t *ap = NULL;
584 char n[DT_TYPE_NAMELEN], *str;
585
586 assert(DTRACEACT_ISPRINTFLIKE(kind));
587
588 if (dnp->dn_args->dn_kind != DT_NODE_STRING) {
589 dnerror(dnp, D_PRINTF_ARG_FMT,
590 "%s( ) argument #1 is incompatible with prototype:\n"
591 "\tprototype: string constant\n\t argument: %s\n",
592 dnp->dn_ident->di_name,
593 dt_node_type_name(dnp->dn_args, n, sizeof (n)));
594 }
595
596 arg1 = dnp->dn_args->dn_list;
597 yylineno = dnp->dn_line;
598 str = dnp->dn_args->dn_string;
599
600
601 /*
602 * If this is an freopen(), we use an empty string to denote that
603 * stdout should be restored. For other printf()-like actions, an
604 * empty format string is illegal: an empty format string would
605 * result in malformed DOF, and the compiler thus flags an empty
606 * format string as a compile-time error. To avoid propagating the
607 * freopen() special case throughout the system, we simply transpose
608 * an empty string into a sentinel string (DT_FREOPEN_RESTORE) that
609 * denotes that stdout should be restored.
610 */
611 if (kind == DTRACEACT_FREOPEN) {
612 if (strcmp(str, DT_FREOPEN_RESTORE) == 0) {
613 /*
614 * Our sentinel is always an invalid argument to
615 * freopen(), but if it's been manually specified, we
616 * must fail now instead of when the freopen() is
617 * actually evaluated.
618 */
619 dnerror(dnp, D_FREOPEN_INVALID,
620 "%s( ) argument #1 cannot be \"%s\"\n",
621 dnp->dn_ident->di_name, DT_FREOPEN_RESTORE);
622 }
623
624 if (str[0] == '\0')
625 str = __UNCONST(DT_FREOPEN_RESTORE);
626 }
627
628 sdp->dtsd_fmtdata = dt_printf_create(dtp, str);
629
630 dt_printf_validate(sdp->dtsd_fmtdata, DT_PRINTF_EXACTLEN,
631 dnp->dn_ident, 1, DTRACEACT_AGGREGATION, arg1);
632
633 if (arg1 == NULL) {
634 dif_instr_t *dbuf;
635 dtrace_difo_t *dp;
636
637 if ((dbuf = dt_alloc(dtp, sizeof (dif_instr_t))) == NULL ||
638 (dp = dt_zalloc(dtp, sizeof (dtrace_difo_t))) == NULL) {
639 dt_free(dtp, dbuf);
640 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
641 }
642
643 dbuf[0] = DIF_INSTR_RET(DIF_REG_R0); /* ret %r0 */
644
645 dp->dtdo_buf = dbuf;
646 dp->dtdo_len = 1;
647 dp->dtdo_rtype = dt_int_rtype;
648
649 ap = dt_stmt_action(dtp, sdp);
650 ap->dtad_difo = dp;
651 ap->dtad_kind = kind;
652 return;
653 }
654
655 for (anp = arg1; anp != NULL; anp = anp->dn_list) {
656 ap = dt_stmt_action(dtp, sdp);
657 dt_cg(yypcb, anp);
658 ap->dtad_difo = dt_as(yypcb);
659 ap->dtad_kind = kind;
660 }
661 }
662
663 static void
dt_action_trace(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)664 dt_action_trace(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
665 {
666 int ctflib = 0; // XXX: gcc
667
668 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
669 boolean_t istrace = (dnp->dn_ident->di_id == DT_ACT_TRACE);
670 const char *act = istrace ? "trace" : "print";
671
672 if (dt_node_is_void(dnp->dn_args)) {
673 dnerror(dnp->dn_args, istrace ? D_TRACE_VOID : D_PRINT_VOID,
674 "%s( ) may not be applied to a void expression\n", act);
675 }
676
677 if (dt_node_resolve(dnp->dn_args, DT_IDENT_XLPTR) != NULL) {
678 dnerror(dnp->dn_args, istrace ? D_TRACE_DYN : D_PRINT_DYN,
679 "%s( ) may not be applied to a translated pointer\n", act);
680 }
681
682 if (dnp->dn_args->dn_kind == DT_NODE_AGG) {
683 dnerror(dnp->dn_args, istrace ? D_TRACE_AGG : D_PRINT_AGG,
684 "%s( ) may not be applied to an aggregation%s\n", act,
685 istrace ? "" : " -- did you mean printa()?");
686 }
687
688 dt_cg(yypcb, dnp->dn_args);
689
690 /*
691 * The print() action behaves identically to trace(), except that it
692 * stores the CTF type of the argument (if present) within the DOF for
693 * the DIFEXPR action. To do this, we set the 'dtsd_strdata' to point
694 * to the fully-qualified CTF type ID for the result of the DIF
695 * action. We use the ID instead of the name to handles complex types
696 * like arrays and function pointers that can't be resolved by
697 * ctf_type_lookup(). This is later processed by dtrace_dof_create()
698 * and turned into a reference into the string table so that we can
699 * get the type information when we process the data after the fact. In
700 * the case where we are referring to userland CTF data, we also need to
701 * to identify which ctf container in question we care about and encode
702 * that within the name.
703 */
704 if (dnp->dn_ident->di_id == DT_ACT_PRINT) {
705 dt_node_t *dret;
706 size_t n;
707 dt_module_t *dmp;
708
709 dret = yypcb->pcb_dret;
710 dmp = dt_module_lookup_by_ctf(dtp, dret->dn_ctfp);
711
712 n = snprintf(NULL, 0, "%s`%ld", dmp->dm_name, dret->dn_type) + 1;
713 if (dmp->dm_pid != 0) {
714 ctflib = dt_module_getlibid(dtp, dmp, dret->dn_ctfp);
715 assert(ctflib >= 0);
716 n = snprintf(NULL, 0, "%s`%d`%ld", dmp->dm_name,
717 ctflib, dret->dn_type) + 1;
718 } else {
719 n = snprintf(NULL, 0, "%s`%ld", dmp->dm_name,
720 dret->dn_type) + 1;
721 }
722 sdp->dtsd_strdata = dt_alloc(dtp, n);
723 if (sdp->dtsd_strdata == NULL)
724 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
725 (void) snprintf(sdp->dtsd_strdata, n, "%s`%ld", dmp->dm_name,
726 dret->dn_type);
727 if (dmp->dm_pid != 0) {
728 (void) snprintf(sdp->dtsd_strdata, n, "%s`%d`%ld",
729 dmp->dm_name, ctflib, dret->dn_type);
730 } else {
731 (void) snprintf(sdp->dtsd_strdata, n, "%s`%ld",
732 dmp->dm_name, dret->dn_type);
733 }
734 }
735
736 ap->dtad_difo = dt_as(yypcb);
737 ap->dtad_kind = DTRACEACT_DIFEXPR;
738 }
739
740 static void
dt_action_tracemem(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)741 dt_action_tracemem(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
742 {
743 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
744
745 dt_node_t *addr = dnp->dn_args;
746 dt_node_t *max = dnp->dn_args->dn_list;
747 dt_node_t *size;
748
749 char n[DT_TYPE_NAMELEN];
750
751 if (dt_node_is_integer(addr) == 0 && dt_node_is_pointer(addr) == 0) {
752 dnerror(addr, D_TRACEMEM_ADDR,
753 "tracemem( ) argument #1 is incompatible with "
754 "prototype:\n\tprototype: pointer or integer\n"
755 "\t argument: %s\n",
756 dt_node_type_name(addr, n, sizeof (n)));
757 }
758
759 if (dt_node_is_posconst(max) == 0) {
760 dnerror(max, D_TRACEMEM_SIZE, "tracemem( ) argument #2 must "
761 "be a non-zero positive integral constant expression\n");
762 }
763
764 if ((size = max->dn_list) != NULL) {
765 if (size->dn_list != NULL) {
766 dnerror(size, D_TRACEMEM_ARGS, "tracemem ( ) prototype "
767 "mismatch: expected at most 3 args\n");
768 }
769
770 if (!dt_node_is_scalar(size)) {
771 dnerror(size, D_TRACEMEM_DYNSIZE, "tracemem ( ) "
772 "dynamic size (argument #3) must be of "
773 "scalar type\n");
774 }
775
776 dt_cg(yypcb, size);
777 ap->dtad_difo = dt_as(yypcb);
778 ap->dtad_difo->dtdo_rtype = dt_int_rtype;
779 ap->dtad_kind = DTRACEACT_TRACEMEM_DYNSIZE;
780
781 ap = dt_stmt_action(dtp, sdp);
782 }
783
784 dt_cg(yypcb, addr);
785 ap->dtad_difo = dt_as(yypcb);
786 ap->dtad_kind = DTRACEACT_TRACEMEM;
787
788 ap->dtad_difo->dtdo_rtype.dtdt_flags |= DIF_TF_BYREF;
789 ap->dtad_difo->dtdo_rtype.dtdt_size = max->dn_value;
790 }
791
792 static void
dt_action_stack_args(dtrace_hdl_t * dtp,dtrace_actdesc_t * ap,dt_node_t * arg0)793 dt_action_stack_args(dtrace_hdl_t *dtp, dtrace_actdesc_t *ap, dt_node_t *arg0)
794 {
795 ap->dtad_kind = DTRACEACT_STACK;
796
797 if (dtp->dt_options[DTRACEOPT_STACKFRAMES] != DTRACEOPT_UNSET) {
798 ap->dtad_arg = dtp->dt_options[DTRACEOPT_STACKFRAMES];
799 } else {
800 ap->dtad_arg = 0;
801 }
802
803 if (arg0 != NULL) {
804 if (arg0->dn_list != NULL) {
805 dnerror(arg0, D_STACK_PROTO, "stack( ) prototype "
806 "mismatch: too many arguments\n");
807 }
808
809 if (dt_node_is_posconst(arg0) == 0) {
810 dnerror(arg0, D_STACK_SIZE, "stack( ) size must be a "
811 "non-zero positive integral constant expression\n");
812 }
813
814 ap->dtad_arg = arg0->dn_value;
815 }
816 }
817
818 static void
dt_action_stack(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)819 dt_action_stack(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
820 {
821 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
822 dt_action_stack_args(dtp, ap, dnp->dn_args);
823 }
824
825 static void
dt_action_ustack_args(dtrace_hdl_t * dtp,dtrace_actdesc_t * ap,dt_node_t * dnp)826 dt_action_ustack_args(dtrace_hdl_t *dtp, dtrace_actdesc_t *ap, dt_node_t *dnp)
827 {
828 uint32_t nframes = 0;
829 uint32_t strsize = 0; /* default string table size */
830 dt_node_t *arg0 = dnp->dn_args;
831 dt_node_t *arg1 = arg0 != NULL ? arg0->dn_list : NULL;
832
833 assert(dnp->dn_ident->di_id == DT_ACT_JSTACK ||
834 dnp->dn_ident->di_id == DT_ACT_USTACK);
835
836 if (dnp->dn_ident->di_id == DT_ACT_JSTACK) {
837 if (dtp->dt_options[DTRACEOPT_JSTACKFRAMES] != DTRACEOPT_UNSET)
838 nframes = dtp->dt_options[DTRACEOPT_JSTACKFRAMES];
839
840 if (dtp->dt_options[DTRACEOPT_JSTACKSTRSIZE] != DTRACEOPT_UNSET)
841 strsize = dtp->dt_options[DTRACEOPT_JSTACKSTRSIZE];
842
843 ap->dtad_kind = DTRACEACT_JSTACK;
844 } else {
845 assert(dnp->dn_ident->di_id == DT_ACT_USTACK);
846
847 if (dtp->dt_options[DTRACEOPT_USTACKFRAMES] != DTRACEOPT_UNSET)
848 nframes = dtp->dt_options[DTRACEOPT_USTACKFRAMES];
849
850 ap->dtad_kind = DTRACEACT_USTACK;
851 }
852
853 if (arg0 != NULL) {
854 if (!dt_node_is_posconst(arg0)) {
855 dnerror(arg0, D_USTACK_FRAMES, "ustack( ) argument #1 "
856 "must be a non-zero positive integer constant\n");
857 }
858 nframes = (uint32_t)arg0->dn_value;
859 }
860
861 if (arg1 != NULL) {
862 if (arg1->dn_kind != DT_NODE_INT ||
863 ((arg1->dn_flags & DT_NF_SIGNED) &&
864 (int64_t)arg1->dn_value < 0)) {
865 dnerror(arg1, D_USTACK_STRSIZE, "ustack( ) argument #2 "
866 "must be a positive integer constant\n");
867 }
868
869 if (arg1->dn_list != NULL) {
870 dnerror(arg1, D_USTACK_PROTO, "ustack( ) prototype "
871 "mismatch: too many arguments\n");
872 }
873
874 strsize = (uint32_t)arg1->dn_value;
875 }
876
877 ap->dtad_arg = DTRACE_USTACK_ARG(nframes, strsize);
878 }
879
880 static void
dt_action_ustack(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)881 dt_action_ustack(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
882 {
883 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
884 dt_action_ustack_args(dtp, ap, dnp);
885 }
886
887 static void
dt_action_setopt(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)888 dt_action_setopt(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
889 {
890 dtrace_actdesc_t *ap;
891 dt_node_t *arg0, *arg1;
892
893 /*
894 * The prototype guarantees that we are called with either one or
895 * two arguments, and that any arguments that are present are strings.
896 */
897 arg0 = dnp->dn_args;
898 arg1 = arg0->dn_list;
899
900 ap = dt_stmt_action(dtp, sdp);
901 dt_cg(yypcb, arg0);
902 ap->dtad_difo = dt_as(yypcb);
903 ap->dtad_kind = DTRACEACT_LIBACT;
904 ap->dtad_arg = DT_ACT_SETOPT;
905
906 ap = dt_stmt_action(dtp, sdp);
907
908 if (arg1 == NULL) {
909 dt_action_difconst(ap, 0, DTRACEACT_LIBACT);
910 } else {
911 dt_cg(yypcb, arg1);
912 ap->dtad_difo = dt_as(yypcb);
913 ap->dtad_kind = DTRACEACT_LIBACT;
914 }
915
916 ap->dtad_arg = DT_ACT_SETOPT;
917 }
918
919 /*ARGSUSED*/
920 static void
dt_action_symmod_args(dtrace_hdl_t * dtp,dtrace_actdesc_t * ap,dt_node_t * dnp,dtrace_actkind_t kind)921 dt_action_symmod_args(dtrace_hdl_t *dtp, dtrace_actdesc_t *ap,
922 dt_node_t *dnp, dtrace_actkind_t kind)
923 {
924 assert(kind == DTRACEACT_SYM || kind == DTRACEACT_MOD ||
925 kind == DTRACEACT_USYM || kind == DTRACEACT_UMOD ||
926 kind == DTRACEACT_UADDR);
927
928 dt_cg(yypcb, dnp);
929 ap->dtad_difo = dt_as(yypcb);
930 ap->dtad_kind = kind;
931 ap->dtad_difo->dtdo_rtype.dtdt_size = sizeof (uint64_t);
932 }
933
934 static void
dt_action_symmod(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp,dtrace_actkind_t kind)935 dt_action_symmod(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp,
936 dtrace_actkind_t kind)
937 {
938 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
939 dt_action_symmod_args(dtp, ap, dnp->dn_args, kind);
940 }
941
942 /*ARGSUSED*/
943 static void
dt_action_ftruncate(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)944 dt_action_ftruncate(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
945 {
946 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
947
948 /*
949 * Library actions need a DIFO that serves as an argument. As
950 * ftruncate() doesn't take an argument, we generate the constant 0
951 * in a DIFO; this constant will be ignored when the ftruncate() is
952 * processed.
953 */
954 dt_action_difconst(ap, 0, DTRACEACT_LIBACT);
955 ap->dtad_arg = DT_ACT_FTRUNCATE;
956 }
957
958 /*ARGSUSED*/
959 static void
dt_action_stop(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)960 dt_action_stop(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
961 {
962 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
963
964 ap->dtad_kind = DTRACEACT_STOP;
965 ap->dtad_arg = 0;
966 }
967
968 /*ARGSUSED*/
969 static void
dt_action_breakpoint(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)970 dt_action_breakpoint(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
971 {
972 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
973
974 ap->dtad_kind = DTRACEACT_BREAKPOINT;
975 ap->dtad_arg = 0;
976 }
977
978 /*ARGSUSED*/
979 static void
dt_action_panic(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)980 dt_action_panic(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
981 {
982 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
983
984 ap->dtad_kind = DTRACEACT_PANIC;
985 ap->dtad_arg = 0;
986 }
987
988 static void
dt_action_chill(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)989 dt_action_chill(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
990 {
991 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
992
993 dt_cg(yypcb, dnp->dn_args);
994 ap->dtad_difo = dt_as(yypcb);
995 ap->dtad_kind = DTRACEACT_CHILL;
996 }
997
998 static void
dt_action_raise(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)999 dt_action_raise(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
1000 {
1001 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
1002
1003 dt_cg(yypcb, dnp->dn_args);
1004 ap->dtad_difo = dt_as(yypcb);
1005 ap->dtad_kind = DTRACEACT_RAISE;
1006 }
1007
1008 static void
dt_action_exit(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)1009 dt_action_exit(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
1010 {
1011 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
1012
1013 dt_cg(yypcb, dnp->dn_args);
1014 ap->dtad_difo = dt_as(yypcb);
1015 ap->dtad_kind = DTRACEACT_EXIT;
1016 ap->dtad_difo->dtdo_rtype.dtdt_size = sizeof (int);
1017 }
1018
1019 static void
dt_action_speculate(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)1020 dt_action_speculate(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
1021 {
1022 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
1023
1024 dt_cg(yypcb, dnp->dn_args);
1025 ap->dtad_difo = dt_as(yypcb);
1026 ap->dtad_kind = DTRACEACT_SPECULATE;
1027 }
1028
1029 static void
dt_action_printm(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)1030 dt_action_printm(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
1031 {
1032 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
1033
1034 dt_node_t *size = dnp->dn_args;
1035 dt_node_t *addr = dnp->dn_args->dn_list;
1036
1037 char n[DT_TYPE_NAMELEN];
1038
1039 if (dt_node_is_posconst(size) == 0) {
1040 dnerror(size, D_PRINTM_SIZE, "printm( ) argument #1 must "
1041 "be a non-zero positive integral constant expression\n");
1042 }
1043
1044 if (dt_node_is_pointer(addr) == 0) {
1045 dnerror(addr, D_PRINTM_ADDR,
1046 "printm( ) argument #2 is incompatible with "
1047 "prototype:\n\tprototype: pointer\n"
1048 "\t argument: %s\n",
1049 dt_node_type_name(addr, n, sizeof (n)));
1050 }
1051
1052 dt_cg(yypcb, addr);
1053 ap->dtad_difo = dt_as(yypcb);
1054 ap->dtad_kind = DTRACEACT_PRINTM;
1055
1056 ap->dtad_difo->dtdo_rtype.dtdt_flags |= DIF_TF_BYREF;
1057 ap->dtad_difo->dtdo_rtype.dtdt_size = size->dn_value + sizeof(uintptr_t);
1058 }
1059
1060 static void
dt_action_commit(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)1061 dt_action_commit(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
1062 {
1063 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
1064
1065 dt_cg(yypcb, dnp->dn_args);
1066 ap->dtad_difo = dt_as(yypcb);
1067 ap->dtad_kind = DTRACEACT_COMMIT;
1068 }
1069
1070 static void
dt_action_discard(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)1071 dt_action_discard(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
1072 {
1073 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
1074
1075 dt_cg(yypcb, dnp->dn_args);
1076 ap->dtad_difo = dt_as(yypcb);
1077 ap->dtad_kind = DTRACEACT_DISCARD;
1078 }
1079
1080 static void
dt_compile_fun(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)1081 dt_compile_fun(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
1082 {
1083 switch (dnp->dn_expr->dn_ident->di_id) {
1084 case DT_ACT_BREAKPOINT:
1085 dt_action_breakpoint(dtp, dnp->dn_expr, sdp);
1086 break;
1087 case DT_ACT_CHILL:
1088 dt_action_chill(dtp, dnp->dn_expr, sdp);
1089 break;
1090 case DT_ACT_CLEAR:
1091 dt_action_clear(dtp, dnp->dn_expr, sdp);
1092 break;
1093 case DT_ACT_COMMIT:
1094 dt_action_commit(dtp, dnp->dn_expr, sdp);
1095 break;
1096 case DT_ACT_DENORMALIZE:
1097 dt_action_normalize(dtp, dnp->dn_expr, sdp);
1098 break;
1099 case DT_ACT_DISCARD:
1100 dt_action_discard(dtp, dnp->dn_expr, sdp);
1101 break;
1102 case DT_ACT_EXIT:
1103 dt_action_exit(dtp, dnp->dn_expr, sdp);
1104 break;
1105 case DT_ACT_FREOPEN:
1106 dt_action_printflike(dtp, dnp->dn_expr, sdp, DTRACEACT_FREOPEN);
1107 break;
1108 case DT_ACT_FTRUNCATE:
1109 dt_action_ftruncate(dtp, dnp->dn_expr, sdp);
1110 break;
1111 case DT_ACT_MOD:
1112 dt_action_symmod(dtp, dnp->dn_expr, sdp, DTRACEACT_MOD);
1113 break;
1114 case DT_ACT_NORMALIZE:
1115 dt_action_normalize(dtp, dnp->dn_expr, sdp);
1116 break;
1117 case DT_ACT_PANIC:
1118 dt_action_panic(dtp, dnp->dn_expr, sdp);
1119 break;
1120 case DT_ACT_PRINT:
1121 dt_action_trace(dtp, dnp->dn_expr, sdp);
1122 break;
1123 case DT_ACT_PRINTA:
1124 dt_action_printa(dtp, dnp->dn_expr, sdp);
1125 break;
1126 case DT_ACT_PRINTF:
1127 dt_action_printflike(dtp, dnp->dn_expr, sdp, DTRACEACT_PRINTF);
1128 break;
1129 case DT_ACT_PRINTM:
1130 dt_action_printm(dtp, dnp->dn_expr, sdp);
1131 break;
1132 case DT_ACT_RAISE:
1133 dt_action_raise(dtp, dnp->dn_expr, sdp);
1134 break;
1135 case DT_ACT_SETOPT:
1136 dt_action_setopt(dtp, dnp->dn_expr, sdp);
1137 break;
1138 case DT_ACT_SPECULATE:
1139 dt_action_speculate(dtp, dnp->dn_expr, sdp);
1140 break;
1141 case DT_ACT_STACK:
1142 dt_action_stack(dtp, dnp->dn_expr, sdp);
1143 break;
1144 case DT_ACT_STOP:
1145 dt_action_stop(dtp, dnp->dn_expr, sdp);
1146 break;
1147 case DT_ACT_SYM:
1148 dt_action_symmod(dtp, dnp->dn_expr, sdp, DTRACEACT_SYM);
1149 break;
1150 case DT_ACT_SYSTEM:
1151 dt_action_printflike(dtp, dnp->dn_expr, sdp, DTRACEACT_SYSTEM);
1152 break;
1153 case DT_ACT_TRACE:
1154 dt_action_trace(dtp, dnp->dn_expr, sdp);
1155 break;
1156 case DT_ACT_TRACEMEM:
1157 dt_action_tracemem(dtp, dnp->dn_expr, sdp);
1158 break;
1159 case DT_ACT_TRUNC:
1160 dt_action_trunc(dtp, dnp->dn_expr, sdp);
1161 break;
1162 case DT_ACT_UADDR:
1163 dt_action_symmod(dtp, dnp->dn_expr, sdp, DTRACEACT_UADDR);
1164 break;
1165 case DT_ACT_UMOD:
1166 dt_action_symmod(dtp, dnp->dn_expr, sdp, DTRACEACT_UMOD);
1167 break;
1168 case DT_ACT_USYM:
1169 dt_action_symmod(dtp, dnp->dn_expr, sdp, DTRACEACT_USYM);
1170 break;
1171 case DT_ACT_USTACK:
1172 case DT_ACT_JSTACK:
1173 dt_action_ustack(dtp, dnp->dn_expr, sdp);
1174 break;
1175 default:
1176 dnerror(dnp->dn_expr, D_UNKNOWN, "tracing function %s( ) is "
1177 "not yet supported\n", dnp->dn_expr->dn_ident->di_name);
1178 }
1179 }
1180
1181 static void
dt_compile_exp(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)1182 dt_compile_exp(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
1183 {
1184 dtrace_actdesc_t *ap = dt_stmt_action(dtp, sdp);
1185
1186 dt_cg(yypcb, dnp->dn_expr);
1187 ap->dtad_difo = dt_as(yypcb);
1188 ap->dtad_difo->dtdo_rtype = dt_void_rtype;
1189 ap->dtad_kind = DTRACEACT_DIFEXPR;
1190 }
1191
1192 static void
dt_compile_agg(dtrace_hdl_t * dtp,dt_node_t * dnp,dtrace_stmtdesc_t * sdp)1193 dt_compile_agg(dtrace_hdl_t *dtp, dt_node_t *dnp, dtrace_stmtdesc_t *sdp)
1194 {
1195 dt_ident_t *aid, *fid;
1196 dt_node_t *anp, *incr = NULL;
1197 dtrace_actdesc_t *ap;
1198 uint_t n = 1, argmax;
1199 uint64_t arg = 0;
1200
1201 /*
1202 * If the aggregation has no aggregating function applied to it, then
1203 * this statement has no effect. Flag this as a programming error.
1204 */
1205 if (dnp->dn_aggfun == NULL) {
1206 dnerror(dnp, D_AGG_NULL, "expression has null effect: @%s\n",
1207 dnp->dn_ident->di_name);
1208 }
1209
1210 aid = dnp->dn_ident;
1211 fid = dnp->dn_aggfun->dn_ident;
1212
1213 if (dnp->dn_aggfun->dn_args != NULL &&
1214 dt_node_is_scalar(dnp->dn_aggfun->dn_args) == 0) {
1215 dnerror(dnp->dn_aggfun, D_AGG_SCALAR, "%s( ) argument #1 must "
1216 "be of scalar type\n", fid->di_name);
1217 }
1218
1219 /*
1220 * The ID of the aggregation itself is implicitly recorded as the first
1221 * member of each aggregation tuple so we can distinguish them later.
1222 */
1223 ap = dt_stmt_action(dtp, sdp);
1224 dt_action_difconst(ap, aid->di_id, DTRACEACT_DIFEXPR);
1225
1226 for (anp = dnp->dn_aggtup; anp != NULL; anp = anp->dn_list) {
1227 ap = dt_stmt_action(dtp, sdp);
1228 n++;
1229
1230 if (anp->dn_kind == DT_NODE_FUNC) {
1231 if (anp->dn_ident->di_id == DT_ACT_STACK) {
1232 dt_action_stack_args(dtp, ap, anp->dn_args);
1233 continue;
1234 }
1235
1236 if (anp->dn_ident->di_id == DT_ACT_USTACK ||
1237 anp->dn_ident->di_id == DT_ACT_JSTACK) {
1238 dt_action_ustack_args(dtp, ap, anp);
1239 continue;
1240 }
1241
1242 switch (anp->dn_ident->di_id) {
1243 case DT_ACT_UADDR:
1244 dt_action_symmod_args(dtp, ap,
1245 anp->dn_args, DTRACEACT_UADDR);
1246 continue;
1247
1248 case DT_ACT_USYM:
1249 dt_action_symmod_args(dtp, ap,
1250 anp->dn_args, DTRACEACT_USYM);
1251 continue;
1252
1253 case DT_ACT_UMOD:
1254 dt_action_symmod_args(dtp, ap,
1255 anp->dn_args, DTRACEACT_UMOD);
1256 continue;
1257
1258 case DT_ACT_SYM:
1259 dt_action_symmod_args(dtp, ap,
1260 anp->dn_args, DTRACEACT_SYM);
1261 continue;
1262
1263 case DT_ACT_MOD:
1264 dt_action_symmod_args(dtp, ap,
1265 anp->dn_args, DTRACEACT_MOD);
1266 continue;
1267
1268 default:
1269 break;
1270 }
1271 }
1272
1273 dt_cg(yypcb, anp);
1274 ap->dtad_difo = dt_as(yypcb);
1275 ap->dtad_kind = DTRACEACT_DIFEXPR;
1276 }
1277
1278 if (fid->di_id == DTRACEAGG_LQUANTIZE) {
1279 /*
1280 * For linear quantization, we have between two and four
1281 * arguments in addition to the expression:
1282 *
1283 * arg1 => Base value
1284 * arg2 => Limit value
1285 * arg3 => Quantization level step size (defaults to 1)
1286 * arg4 => Quantization increment value (defaults to 1)
1287 */
1288 dt_node_t *arg1 = dnp->dn_aggfun->dn_args->dn_list;
1289 dt_node_t *arg2 = arg1->dn_list;
1290 dt_node_t *arg3 = arg2->dn_list;
1291 dt_idsig_t *isp;
1292 uint64_t nlevels, step = 1, oarg;
1293 int64_t baseval, limitval;
1294
1295 if (arg1->dn_kind != DT_NODE_INT) {
1296 dnerror(arg1, D_LQUANT_BASETYPE, "lquantize( ) "
1297 "argument #1 must be an integer constant\n");
1298 }
1299
1300 baseval = (int64_t)arg1->dn_value;
1301
1302 if (baseval < INT32_MIN || baseval > INT32_MAX) {
1303 dnerror(arg1, D_LQUANT_BASEVAL, "lquantize( ) "
1304 "argument #1 must be a 32-bit quantity\n");
1305 }
1306
1307 if (arg2->dn_kind != DT_NODE_INT) {
1308 dnerror(arg2, D_LQUANT_LIMTYPE, "lquantize( ) "
1309 "argument #2 must be an integer constant\n");
1310 }
1311
1312 limitval = (int64_t)arg2->dn_value;
1313
1314 if (limitval < INT32_MIN || limitval > INT32_MAX) {
1315 dnerror(arg2, D_LQUANT_LIMVAL, "lquantize( ) "
1316 "argument #2 must be a 32-bit quantity\n");
1317 }
1318
1319 if (limitval < baseval) {
1320 dnerror(dnp, D_LQUANT_MISMATCH,
1321 "lquantize( ) base (argument #1) must be less "
1322 "than limit (argument #2)\n");
1323 }
1324
1325 if (arg3 != NULL) {
1326 if (!dt_node_is_posconst(arg3)) {
1327 dnerror(arg3, D_LQUANT_STEPTYPE, "lquantize( ) "
1328 "argument #3 must be a non-zero positive "
1329 "integer constant\n");
1330 }
1331
1332 if ((step = arg3->dn_value) > UINT16_MAX) {
1333 dnerror(arg3, D_LQUANT_STEPVAL, "lquantize( ) "
1334 "argument #3 must be a 16-bit quantity\n");
1335 }
1336 }
1337
1338 nlevels = (limitval - baseval) / step;
1339
1340 if (nlevels == 0) {
1341 dnerror(dnp, D_LQUANT_STEPLARGE,
1342 "lquantize( ) step (argument #3) too large: must "
1343 "have at least one quantization level\n");
1344 }
1345
1346 if (nlevels > UINT16_MAX) {
1347 dnerror(dnp, D_LQUANT_STEPSMALL, "lquantize( ) step "
1348 "(argument #3) too small: number of quantization "
1349 "levels must be a 16-bit quantity\n");
1350 }
1351
1352 arg = (step << DTRACE_LQUANTIZE_STEPSHIFT) |
1353 (nlevels << DTRACE_LQUANTIZE_LEVELSHIFT) |
1354 ((baseval << DTRACE_LQUANTIZE_BASESHIFT) &
1355 DTRACE_LQUANTIZE_BASEMASK);
1356
1357 assert(arg != 0);
1358
1359 isp = (dt_idsig_t *)aid->di_data;
1360
1361 if (isp->dis_auxinfo == 0) {
1362 /*
1363 * This is the first time we've seen an lquantize()
1364 * for this aggregation; we'll store our argument
1365 * as the auxiliary signature information.
1366 */
1367 isp->dis_auxinfo = arg;
1368 } else if ((oarg = isp->dis_auxinfo) != arg) {
1369 /*
1370 * If we have seen this lquantize() before and the
1371 * argument doesn't match the original argument, pick
1372 * the original argument apart to concisely report the
1373 * mismatch.
1374 */
1375 int obaseval = DTRACE_LQUANTIZE_BASE(oarg);
1376 int onlevels = DTRACE_LQUANTIZE_LEVELS(oarg);
1377 int ostep = DTRACE_LQUANTIZE_STEP(oarg);
1378
1379 if (obaseval != baseval) {
1380 dnerror(dnp, D_LQUANT_MATCHBASE, "lquantize( ) "
1381 "base (argument #1) doesn't match previous "
1382 "declaration: expected %d, found %d\n",
1383 obaseval, (int)baseval);
1384 }
1385
1386 if (onlevels * ostep != nlevels * step) {
1387 dnerror(dnp, D_LQUANT_MATCHLIM, "lquantize( ) "
1388 "limit (argument #2) doesn't match previous"
1389 " declaration: expected %d, found %d\n",
1390 obaseval + onlevels * ostep,
1391 (int)baseval + (int)nlevels * (int)step);
1392 }
1393
1394 if (ostep != step) {
1395 dnerror(dnp, D_LQUANT_MATCHSTEP, "lquantize( ) "
1396 "step (argument #3) doesn't match previous "
1397 "declaration: expected %d, found %d\n",
1398 ostep, (int)step);
1399 }
1400
1401 /*
1402 * We shouldn't be able to get here -- one of the
1403 * parameters must be mismatched if the arguments
1404 * didn't match.
1405 */
1406 assert(0);
1407 }
1408
1409 incr = arg3 != NULL ? arg3->dn_list : NULL;
1410 argmax = 5;
1411 }
1412
1413 if (fid->di_id == DTRACEAGG_LLQUANTIZE) {
1414 /*
1415 * For log/linear quantizations, we have between one and five
1416 * arguments in addition to the expression:
1417 *
1418 * arg1 => Factor
1419 * arg2 => Low magnitude
1420 * arg3 => High magnitude
1421 * arg4 => Number of steps per magnitude
1422 * arg5 => Quantization increment value (defaults to 1)
1423 */
1424 dt_node_t *llarg = dnp->dn_aggfun->dn_args->dn_list;
1425 uint64_t oarg, order, v;
1426 dt_idsig_t *isp;
1427 int i;
1428
1429 struct {
1430 char *str; /* string identifier */
1431 int badtype; /* error on bad type */
1432 int badval; /* error on bad value */
1433 int mismatch; /* error on bad match */
1434 int shift; /* shift value */
1435 uint16_t value; /* value itself */
1436 } args[] = {
1437 { "factor", D_LLQUANT_FACTORTYPE,
1438 D_LLQUANT_FACTORVAL, D_LLQUANT_FACTORMATCH,
1439 DTRACE_LLQUANTIZE_FACTORSHIFT },
1440 { "low magnitude", D_LLQUANT_LOWTYPE,
1441 D_LLQUANT_LOWVAL, D_LLQUANT_LOWMATCH,
1442 DTRACE_LLQUANTIZE_LOWSHIFT },
1443 { "high magnitude", D_LLQUANT_HIGHTYPE,
1444 D_LLQUANT_HIGHVAL, D_LLQUANT_HIGHMATCH,
1445 DTRACE_LLQUANTIZE_HIGHSHIFT },
1446 { "linear steps per magnitude", D_LLQUANT_NSTEPTYPE,
1447 D_LLQUANT_NSTEPVAL, D_LLQUANT_NSTEPMATCH,
1448 DTRACE_LLQUANTIZE_NSTEPSHIFT },
1449 { NULL }
1450 };
1451
1452 assert(arg == 0);
1453
1454 for (i = 0; args[i].str != NULL; i++) {
1455 if (llarg->dn_kind != DT_NODE_INT) {
1456 dnerror(llarg, args[i].badtype, "llquantize( ) "
1457 "argument #%d (%s) must be an "
1458 "integer constant\n", i + 1, args[i].str);
1459 }
1460
1461 if ((uint64_t)llarg->dn_value > UINT16_MAX) {
1462 dnerror(llarg, args[i].badval, "llquantize( ) "
1463 "argument #%d (%s) must be an unsigned "
1464 "16-bit quantity\n", i + 1, args[i].str);
1465 }
1466
1467 args[i].value = (uint16_t)llarg->dn_value;
1468
1469 assert(!(arg & ((uint64_t)UINT16_MAX <<
1470 args[i].shift)));
1471 arg |= ((uint64_t)args[i].value << args[i].shift);
1472 llarg = llarg->dn_list;
1473 }
1474
1475 assert(arg != 0);
1476
1477 if (args[0].value < 2) {
1478 dnerror(dnp, D_LLQUANT_FACTORSMALL, "llquantize( ) "
1479 "factor (argument #1) must be two or more\n");
1480 }
1481
1482 if (args[1].value >= args[2].value) {
1483 dnerror(dnp, D_LLQUANT_MAGRANGE, "llquantize( ) "
1484 "high magnitude (argument #3) must be greater "
1485 "than low magnitude (argument #2)\n");
1486 }
1487
1488 if (args[3].value < args[0].value) {
1489 dnerror(dnp, D_LLQUANT_FACTORNSTEPS, "llquantize( ) "
1490 "factor (argument #1) must be less than or "
1491 "equal to the number of linear steps per "
1492 "magnitude (argument #4)\n");
1493 }
1494
1495 for (v = args[0].value; v < args[3].value; v *= args[0].value)
1496 continue;
1497
1498 if ((args[3].value % args[0].value) || (v % args[3].value)) {
1499 dnerror(dnp, D_LLQUANT_FACTOREVEN, "llquantize( ) "
1500 "factor (argument #1) must evenly divide the "
1501 "number of steps per magnitude (argument #4), "
1502 "and the number of steps per magnitude must evenly "
1503 "divide a power of the factor\n");
1504 }
1505
1506 for (i = 0, order = 1; i < args[2].value; i++) {
1507 if (order * args[0].value > order) {
1508 order *= args[0].value;
1509 continue;
1510 }
1511
1512 dnerror(dnp, D_LLQUANT_MAGTOOBIG, "llquantize( ) "
1513 "factor (%d) raised to power of high magnitude "
1514 "(%d) overflows 64-bits\n", args[0].value,
1515 args[2].value);
1516 }
1517
1518 isp = (dt_idsig_t *)aid->di_data;
1519
1520 if (isp->dis_auxinfo == 0) {
1521 /*
1522 * This is the first time we've seen an llquantize()
1523 * for this aggregation; we'll store our argument
1524 * as the auxiliary signature information.
1525 */
1526 isp->dis_auxinfo = arg;
1527 } else if ((oarg = isp->dis_auxinfo) != arg) {
1528 /*
1529 * If we have seen this llquantize() before and the
1530 * argument doesn't match the original argument, pick
1531 * the original argument apart to concisely report the
1532 * mismatch.
1533 */
1534 int expected = 0, found = 0;
1535
1536 for (i = 0; expected == found; i++) {
1537 assert(args[i].str != NULL);
1538
1539 expected = (oarg >> args[i].shift) & UINT16_MAX;
1540 found = (arg >> args[i].shift) & UINT16_MAX;
1541 }
1542
1543 dnerror(dnp, args[i - 1].mismatch, "llquantize( ) "
1544 "%s (argument #%d) doesn't match previous "
1545 "declaration: expected %d, found %d\n",
1546 args[i - 1].str, i, expected, found);
1547 }
1548
1549 incr = llarg;
1550 argmax = 6;
1551 }
1552
1553 if (fid->di_id == DTRACEAGG_QUANTIZE) {
1554 incr = dnp->dn_aggfun->dn_args->dn_list;
1555 argmax = 2;
1556 }
1557
1558 if (incr != NULL) {
1559 if (!dt_node_is_scalar(incr)) {
1560 dnerror(dnp, D_PROTO_ARG, "%s( ) increment value "
1561 "(argument #%d) must be of scalar type\n",
1562 fid->di_name, argmax);
1563 }
1564
1565 if ((anp = incr->dn_list) != NULL) {
1566 int argc = argmax;
1567
1568 for (; anp != NULL; anp = anp->dn_list)
1569 argc++;
1570
1571 dnerror(incr, D_PROTO_LEN, "%s( ) prototype "
1572 "mismatch: %d args passed, at most %d expected",
1573 fid->di_name, argc, argmax);
1574 }
1575
1576 ap = dt_stmt_action(dtp, sdp);
1577 n++;
1578
1579 dt_cg(yypcb, incr);
1580 ap->dtad_difo = dt_as(yypcb);
1581 ap->dtad_difo->dtdo_rtype = dt_void_rtype;
1582 ap->dtad_kind = DTRACEACT_DIFEXPR;
1583 }
1584
1585 assert(sdp->dtsd_aggdata == NULL);
1586 sdp->dtsd_aggdata = aid;
1587
1588 ap = dt_stmt_action(dtp, sdp);
1589 assert(fid->di_kind == DT_IDENT_AGGFUNC);
1590 assert(DTRACEACT_ISAGG(fid->di_id));
1591 ap->dtad_kind = fid->di_id;
1592 ap->dtad_ntuple = n;
1593 ap->dtad_arg = arg;
1594
1595 if (dnp->dn_aggfun->dn_args != NULL) {
1596 dt_cg(yypcb, dnp->dn_aggfun->dn_args);
1597 ap->dtad_difo = dt_as(yypcb);
1598 }
1599 }
1600
1601 static void
dt_compile_one_clause(dtrace_hdl_t * dtp,dt_node_t * cnp,dt_node_t * pnp)1602 dt_compile_one_clause(dtrace_hdl_t *dtp, dt_node_t *cnp, dt_node_t *pnp)
1603 {
1604 dtrace_ecbdesc_t *edp;
1605 dtrace_stmtdesc_t *sdp;
1606 dt_node_t *dnp;
1607
1608 yylineno = pnp->dn_line;
1609 dt_setcontext(dtp, pnp->dn_desc);
1610 (void) dt_node_cook(cnp, DT_IDFLG_REF);
1611
1612 if (DT_TREEDUMP_PASS(dtp, 2))
1613 dt_node_printr(cnp, stderr, 0);
1614
1615 if ((edp = dt_ecbdesc_create(dtp, pnp->dn_desc)) == NULL)
1616 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
1617
1618 assert(yypcb->pcb_ecbdesc == NULL);
1619 yypcb->pcb_ecbdesc = edp;
1620
1621 if (cnp->dn_pred != NULL) {
1622 dt_cg(yypcb, cnp->dn_pred);
1623 edp->dted_pred.dtpdd_difo = dt_as(yypcb);
1624 }
1625
1626 if (cnp->dn_acts == NULL) {
1627 dt_stmt_append(dt_stmt_create(dtp, edp,
1628 cnp->dn_ctxattr, _dtrace_defattr), cnp);
1629 }
1630
1631 for (dnp = cnp->dn_acts; dnp != NULL; dnp = dnp->dn_list) {
1632 assert(yypcb->pcb_stmt == NULL);
1633 sdp = dt_stmt_create(dtp, edp, cnp->dn_ctxattr, cnp->dn_attr);
1634
1635 switch (dnp->dn_kind) {
1636 case DT_NODE_DEXPR:
1637 if (dnp->dn_expr->dn_kind == DT_NODE_AGG)
1638 dt_compile_agg(dtp, dnp->dn_expr, sdp);
1639 else
1640 dt_compile_exp(dtp, dnp, sdp);
1641 break;
1642 case DT_NODE_DFUNC:
1643 dt_compile_fun(dtp, dnp, sdp);
1644 break;
1645 case DT_NODE_AGG:
1646 dt_compile_agg(dtp, dnp, sdp);
1647 break;
1648 default:
1649 dnerror(dnp, D_UNKNOWN, "internal error -- node kind "
1650 "%u is not a valid statement\n", dnp->dn_kind);
1651 }
1652
1653 assert(yypcb->pcb_stmt == sdp);
1654 dt_stmt_append(sdp, dnp);
1655 }
1656
1657 assert(yypcb->pcb_ecbdesc == edp);
1658 dt_ecbdesc_release(dtp, edp);
1659 dt_endcontext(dtp);
1660 yypcb->pcb_ecbdesc = NULL;
1661 }
1662
1663 static void
dt_compile_clause(dtrace_hdl_t * dtp,dt_node_t * cnp)1664 dt_compile_clause(dtrace_hdl_t *dtp, dt_node_t *cnp)
1665 {
1666 dt_node_t *pnp;
1667
1668 for (pnp = cnp->dn_pdescs; pnp != NULL; pnp = pnp->dn_list)
1669 dt_compile_one_clause(dtp, cnp, pnp);
1670 }
1671
1672 static void
dt_compile_xlator(dt_node_t * dnp)1673 dt_compile_xlator(dt_node_t *dnp)
1674 {
1675 dt_xlator_t *dxp = dnp->dn_xlator;
1676 dt_node_t *mnp;
1677
1678 for (mnp = dnp->dn_members; mnp != NULL; mnp = mnp->dn_list) {
1679 assert(dxp->dx_membdif[mnp->dn_membid] == NULL);
1680 dt_cg(yypcb, mnp);
1681 dxp->dx_membdif[mnp->dn_membid] = dt_as(yypcb);
1682 }
1683 }
1684
1685 void
dt_setcontext(dtrace_hdl_t * dtp,dtrace_probedesc_t * pdp)1686 dt_setcontext(dtrace_hdl_t *dtp, dtrace_probedesc_t *pdp)
1687 {
1688 const dtrace_pattr_t *pap;
1689 dt_probe_t *prp;
1690 dt_provider_t *pvp;
1691 dt_ident_t *idp;
1692 char attrstr[8];
1693 int err;
1694
1695 /*
1696 * Both kernel and pid based providers are allowed to have names
1697 * ending with what could be interpreted as a number. We assume it's
1698 * a pid and that we may need to dynamically create probes for
1699 * that process if:
1700 *
1701 * (1) The provider doesn't exist, or,
1702 * (2) The provider exists and has DTRACE_PRIV_PROC privilege.
1703 *
1704 * On an error, dt_pid_create_probes() will set the error message
1705 * and tag -- we just have to longjmp() out of here.
1706 */
1707 if (isdigit((unsigned char)pdp->dtpd_provider[strlen(pdp->dtpd_provider) - 1]) &&
1708 ((pvp = dt_provider_lookup(dtp, pdp->dtpd_provider)) == NULL ||
1709 pvp->pv_desc.dtvd_priv.dtpp_flags & DTRACE_PRIV_PROC) &&
1710 dt_pid_create_probes(pdp, dtp, yypcb) != 0) {
1711 longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
1712 }
1713
1714 /*
1715 * Call dt_probe_info() to get the probe arguments and attributes. If
1716 * a representative probe is found, set 'pap' to the probe provider's
1717 * attributes. Otherwise set 'pap' to default Unstable attributes.
1718 */
1719 if ((prp = dt_probe_info(dtp, pdp, &yypcb->pcb_pinfo)) == NULL) {
1720 pap = &_dtrace_prvdesc;
1721 err = dtrace_errno(dtp);
1722 bzero(&yypcb->pcb_pinfo, sizeof (dtrace_probeinfo_t));
1723 yypcb->pcb_pinfo.dtp_attr = pap->dtpa_provider;
1724 yypcb->pcb_pinfo.dtp_arga = pap->dtpa_args;
1725 } else {
1726 pap = &prp->pr_pvp->pv_desc.dtvd_attr;
1727 err = 0;
1728 }
1729
1730 if (err == EDT_NOPROBE && !(yypcb->pcb_cflags & DTRACE_C_ZDEFS)) {
1731 xyerror(D_PDESC_ZERO, "probe description %s:%s:%s:%s does not "
1732 "match any probes\n", pdp->dtpd_provider, pdp->dtpd_mod,
1733 pdp->dtpd_func, pdp->dtpd_name);
1734 }
1735
1736 if (err != EDT_NOPROBE && err != EDT_UNSTABLE && err != 0)
1737 xyerror(D_PDESC_INVAL, "%s\n", dtrace_errmsg(dtp, err));
1738
1739 dt_dprintf("set context to %s:%s:%s:%s [%u] prp=%p attr=%s argc=%d\n",
1740 pdp->dtpd_provider, pdp->dtpd_mod, pdp->dtpd_func, pdp->dtpd_name,
1741 pdp->dtpd_id, (void *)prp, dt_attr_str(yypcb->pcb_pinfo.dtp_attr,
1742 attrstr, sizeof (attrstr)), yypcb->pcb_pinfo.dtp_argc);
1743
1744 /*
1745 * Reset the stability attributes of D global variables that vary
1746 * based on the attributes of the provider and context itself.
1747 */
1748 if ((idp = dt_idhash_lookup(dtp->dt_globals, "probeprov")) != NULL)
1749 idp->di_attr = pap->dtpa_provider;
1750 if ((idp = dt_idhash_lookup(dtp->dt_globals, "probemod")) != NULL)
1751 idp->di_attr = pap->dtpa_mod;
1752 if ((idp = dt_idhash_lookup(dtp->dt_globals, "probefunc")) != NULL)
1753 idp->di_attr = pap->dtpa_func;
1754 if ((idp = dt_idhash_lookup(dtp->dt_globals, "probename")) != NULL)
1755 idp->di_attr = pap->dtpa_name;
1756 if ((idp = dt_idhash_lookup(dtp->dt_globals, "args")) != NULL)
1757 idp->di_attr = pap->dtpa_args;
1758
1759 yypcb->pcb_pdesc = pdp;
1760 yypcb->pcb_probe = prp;
1761 }
1762
1763 /*
1764 * Reset context-dependent variables and state at the end of cooking a D probe
1765 * definition clause. This ensures that external declarations between clauses
1766 * do not reference any stale context-dependent data from the previous clause.
1767 */
1768 void
dt_endcontext(dtrace_hdl_t * dtp)1769 dt_endcontext(dtrace_hdl_t *dtp)
1770 {
1771 static const char *const cvars[] = {
1772 "probeprov", "probemod", "probefunc", "probename", "args", NULL
1773 };
1774
1775 dt_ident_t *idp;
1776 int i;
1777
1778 for (i = 0; cvars[i] != NULL; i++) {
1779 if ((idp = dt_idhash_lookup(dtp->dt_globals, cvars[i])) != NULL)
1780 idp->di_attr = _dtrace_defattr;
1781 }
1782
1783 yypcb->pcb_pdesc = NULL;
1784 yypcb->pcb_probe = NULL;
1785 }
1786
1787 static int
dt_reduceid(dt_idhash_t * dhp,dt_ident_t * idp,dtrace_hdl_t * dtp)1788 dt_reduceid(dt_idhash_t *dhp, dt_ident_t *idp, dtrace_hdl_t *dtp)
1789 {
1790 if (idp->di_vers != 0 && idp->di_vers > dtp->dt_vmax)
1791 dt_idhash_delete(dhp, idp);
1792
1793 return (0);
1794 }
1795
1796 /*
1797 * When dtrace_setopt() is called for "version", it calls dt_reduce() to remove
1798 * any identifiers or translators that have been previously defined as bound to
1799 * a version greater than the specified version. Therefore, in our current
1800 * version implementation, establishing a binding is a one-way transformation.
1801 * In addition, no versioning is currently provided for types as our .d library
1802 * files do not define any types and we reserve prefixes DTRACE_ and dtrace_
1803 * for our exclusive use. If required, type versioning will require more work.
1804 */
1805 int
dt_reduce(dtrace_hdl_t * dtp,dt_version_t v)1806 dt_reduce(dtrace_hdl_t *dtp, dt_version_t v)
1807 {
1808 char s[DT_VERSION_STRMAX];
1809 dt_xlator_t *dxp, *nxp;
1810
1811 if (v > dtp->dt_vmax)
1812 return (dt_set_errno(dtp, EDT_VERSREDUCED));
1813 else if (v == dtp->dt_vmax)
1814 return (0); /* no reduction necessary */
1815
1816 dt_dprintf("reducing api version to %s\n",
1817 dt_version_num2str(v, s, sizeof (s)));
1818
1819 dtp->dt_vmax = v;
1820
1821 for (dxp = dt_list_next(&dtp->dt_xlators); dxp != NULL; dxp = nxp) {
1822 nxp = dt_list_next(dxp);
1823 if ((dxp->dx_souid.di_vers != 0 && dxp->dx_souid.di_vers > v) ||
1824 (dxp->dx_ptrid.di_vers != 0 && dxp->dx_ptrid.di_vers > v))
1825 dt_list_delete(&dtp->dt_xlators, dxp);
1826 }
1827
1828 (void) dt_idhash_iter(dtp->dt_macros, (dt_idhash_f *)dt_reduceid, dtp);
1829 (void) dt_idhash_iter(dtp->dt_aggs, (dt_idhash_f *)dt_reduceid, dtp);
1830 (void) dt_idhash_iter(dtp->dt_globals, (dt_idhash_f *)dt_reduceid, dtp);
1831 (void) dt_idhash_iter(dtp->dt_tls, (dt_idhash_f *)dt_reduceid, dtp);
1832
1833 return (0);
1834 }
1835
1836 /*
1837 * Fork and exec the cpp(1) preprocessor to run over the specified input file,
1838 * and return a FILE handle for the cpp output. We use the /dev/fd filesystem
1839 * here to simplify the code by leveraging file descriptor inheritance.
1840 */
1841 static FILE *
dt_preproc(dtrace_hdl_t * dtp,FILE * ifp)1842 dt_preproc(dtrace_hdl_t *dtp, FILE *ifp)
1843 {
1844 int argc = dtp->dt_cpp_argc;
1845 char **argv = malloc(sizeof (char *) * (argc + 5));
1846 FILE *ofp = tmpfile();
1847
1848 #ifdef illumos
1849 char ipath[20], opath[20]; /* big enough for /dev/fd/ + INT_MAX + \0 */
1850 #endif
1851 char verdef[32]; /* big enough for -D__SUNW_D_VERSION=0x%08x + \0 */
1852
1853 struct sigaction act, oact;
1854 sigset_t mask, omask;
1855
1856 int wstat, estat;
1857 pid_t pid;
1858 #ifdef illumos
1859 off64_t off;
1860 #else
1861 off_t off = 0;
1862 #endif
1863 int c;
1864
1865 if (argv == NULL || ofp == NULL) {
1866 (void) dt_set_errno(dtp, errno);
1867 goto err;
1868 }
1869
1870 /*
1871 * If the input is a seekable file, see if it is an interpreter file.
1872 * If we see #!, seek past the first line because cpp will choke on it.
1873 * We start cpp just prior to the \n at the end of this line so that
1874 * it still sees the newline, ensuring that #line values are correct.
1875 */
1876 if (isatty(fileno(ifp)) == 0 && (off = ftello64(ifp)) != -1) {
1877 if ((c = fgetc(ifp)) == '#' && (c = fgetc(ifp)) == '!') {
1878 for (off += 2; c != '\n'; off++) {
1879 if ((c = fgetc(ifp)) == EOF)
1880 break;
1881 }
1882 if (c == '\n')
1883 off--; /* start cpp just prior to \n */
1884 }
1885 (void) fflush(ifp);
1886 (void) fseeko64(ifp, off, SEEK_SET);
1887 }
1888
1889 #ifdef illumos
1890 (void) snprintf(ipath, sizeof (ipath), "/dev/fd/%d", fileno(ifp));
1891 (void) snprintf(opath, sizeof (opath), "/dev/fd/%d", fileno(ofp));
1892 #endif
1893
1894 bcopy(dtp->dt_cpp_argv, argv, sizeof (char *) * argc);
1895
1896 (void) snprintf(verdef, sizeof (verdef),
1897 "-D__SUNW_D_VERSION=0x%08x", dtp->dt_vmax);
1898 argv[argc++] = verdef;
1899
1900 #ifdef illumos
1901 switch (dtp->dt_stdcmode) {
1902 case DT_STDC_XA:
1903 case DT_STDC_XT:
1904 argv[argc++] = "-D__STDC__=0";
1905 break;
1906 case DT_STDC_XC:
1907 argv[argc++] = "-D__STDC__=1";
1908 break;
1909 }
1910
1911 argv[argc++] = ipath;
1912 argv[argc++] = opath;
1913 #else
1914 argv[argc++] = "-P";
1915 #endif
1916 argv[argc] = NULL;
1917
1918 /*
1919 * libdtrace must be able to be embedded in other programs that may
1920 * include application-specific signal handlers. Therefore, if we
1921 * need to fork to run cpp(1), we must avoid generating a SIGCHLD
1922 * that could confuse the containing application. To do this,
1923 * we block SIGCHLD and reset its disposition to SIG_DFL.
1924 * We restore our signal state once we are done.
1925 */
1926 (void) sigemptyset(&mask);
1927 (void) sigaddset(&mask, SIGCHLD);
1928 (void) sigprocmask(SIG_BLOCK, &mask, &omask);
1929
1930 bzero(&act, sizeof (act));
1931 act.sa_handler = SIG_DFL;
1932 (void) sigaction(SIGCHLD, &act, &oact);
1933
1934 if ((pid = fork1()) == -1) {
1935 (void) sigaction(SIGCHLD, &oact, NULL);
1936 (void) sigprocmask(SIG_SETMASK, &omask, NULL);
1937 (void) dt_set_errno(dtp, EDT_CPPFORK);
1938 goto err;
1939 }
1940
1941 if (pid == 0) {
1942 #ifndef illumos
1943 if (isatty(fileno(ifp)) == 0)
1944 lseek(fileno(ifp), off, SEEK_SET);
1945 dup2(fileno(ifp), 0);
1946 dup2(fileno(ofp), 1);
1947 #endif
1948 (void) execvp(dtp->dt_cpp_path, argv);
1949 _exit(errno == ENOENT ? 127 : 126);
1950 }
1951
1952 do {
1953 dt_dprintf("waiting for %s (PID %d)\n", dtp->dt_cpp_path,
1954 (int)pid);
1955 } while (waitpid(pid, &wstat, 0) == -1 && errno == EINTR);
1956
1957 (void) sigaction(SIGCHLD, &oact, NULL);
1958 (void) sigprocmask(SIG_SETMASK, &omask, NULL);
1959
1960 dt_dprintf("%s returned exit status 0x%x\n", dtp->dt_cpp_path, wstat);
1961 estat = WIFEXITED(wstat) ? WEXITSTATUS(wstat) : -1;
1962
1963 if (estat != 0) {
1964 switch (estat) {
1965 case 126:
1966 (void) dt_set_errno(dtp, EDT_CPPEXEC);
1967 break;
1968 case 127:
1969 (void) dt_set_errno(dtp, EDT_CPPENT);
1970 break;
1971 default:
1972 (void) dt_set_errno(dtp, EDT_CPPERR);
1973 }
1974 goto err;
1975 }
1976
1977 free(argv);
1978 (void) fflush(ofp);
1979 (void) fseek(ofp, 0, SEEK_SET);
1980 return (ofp);
1981
1982 err:
1983 free(argv);
1984 (void) fclose(ofp);
1985 return (NULL);
1986 }
1987
1988 static void
dt_lib_depend_error(dtrace_hdl_t * dtp,const char * format,...)1989 dt_lib_depend_error(dtrace_hdl_t *dtp, const char *format, ...)
1990 {
1991 va_list ap;
1992
1993 va_start(ap, format);
1994 dt_set_errmsg(dtp, NULL, NULL, NULL, 0, format, ap);
1995 va_end(ap);
1996 }
1997
1998 int
dt_lib_depend_add(dtrace_hdl_t * dtp,dt_list_t * dlp,const char * arg)1999 dt_lib_depend_add(dtrace_hdl_t *dtp, dt_list_t *dlp, const char *arg)
2000 {
2001 dt_lib_depend_t *dld;
2002 const char *end;
2003
2004 assert(arg != NULL);
2005
2006 if ((end = strrchr(arg, '/')) == NULL)
2007 return (dt_set_errno(dtp, EINVAL));
2008
2009 if ((dld = dt_zalloc(dtp, sizeof (dt_lib_depend_t))) == NULL)
2010 return (-1);
2011
2012 if ((dld->dtld_libpath = dt_alloc(dtp, MAXPATHLEN)) == NULL) {
2013 dt_free(dtp, dld);
2014 return (-1);
2015 }
2016
2017 (void) strlcpy(dld->dtld_libpath, arg, end - arg + 2);
2018 if ((dld->dtld_library = strdup(arg)) == NULL) {
2019 dt_free(dtp, dld->dtld_libpath);
2020 dt_free(dtp, dld);
2021 return (dt_set_errno(dtp, EDT_NOMEM));
2022 }
2023
2024 dt_list_append(dlp, dld);
2025 return (0);
2026 }
2027
2028 dt_lib_depend_t *
dt_lib_depend_lookup(dt_list_t * dld,const char * arg)2029 dt_lib_depend_lookup(dt_list_t *dld, const char *arg)
2030 {
2031 dt_lib_depend_t *dldn;
2032
2033 for (dldn = dt_list_next(dld); dldn != NULL;
2034 dldn = dt_list_next(dldn)) {
2035 if (strcmp(dldn->dtld_library, arg) == 0)
2036 return (dldn);
2037 }
2038
2039 return (NULL);
2040 }
2041
2042 /*
2043 * Go through all the library files, and, if any library dependencies exist for
2044 * that file, add it to that node's list of dependents. The result of this
2045 * will be a graph which can then be topologically sorted to produce a
2046 * compilation order.
2047 */
2048 static int
dt_lib_build_graph(dtrace_hdl_t * dtp)2049 dt_lib_build_graph(dtrace_hdl_t *dtp)
2050 {
2051 dt_lib_depend_t *dld, *dpld;
2052
2053 for (dld = dt_list_next(&dtp->dt_lib_dep); dld != NULL;
2054 dld = dt_list_next(dld)) {
2055 char *library = dld->dtld_library;
2056
2057 for (dpld = dt_list_next(&dld->dtld_dependencies); dpld != NULL;
2058 dpld = dt_list_next(dpld)) {
2059 dt_lib_depend_t *dlda;
2060
2061 if ((dlda = dt_lib_depend_lookup(&dtp->dt_lib_dep,
2062 dpld->dtld_library)) == NULL) {
2063 dt_lib_depend_error(dtp,
2064 "Invalid library dependency in %s: %s\n",
2065 dld->dtld_library, dpld->dtld_library);
2066
2067 return (dt_set_errno(dtp, EDT_COMPILER));
2068 }
2069
2070 if ((dt_lib_depend_add(dtp, &dlda->dtld_dependents,
2071 library)) != 0) {
2072 return (-1); /* preserve dt_errno */
2073 }
2074 }
2075 }
2076 return (0);
2077 }
2078
2079 static int
dt_topo_sort(dtrace_hdl_t * dtp,dt_lib_depend_t * dld,int * count)2080 dt_topo_sort(dtrace_hdl_t *dtp, dt_lib_depend_t *dld, int *count)
2081 {
2082 dt_lib_depend_t *dpld, *dlda, *new;
2083
2084 dld->dtld_start = ++(*count);
2085
2086 for (dpld = dt_list_next(&dld->dtld_dependents); dpld != NULL;
2087 dpld = dt_list_next(dpld)) {
2088 dlda = dt_lib_depend_lookup(&dtp->dt_lib_dep,
2089 dpld->dtld_library);
2090 assert(dlda != NULL);
2091
2092 if (dlda->dtld_start == 0 &&
2093 dt_topo_sort(dtp, dlda, count) == -1)
2094 return (-1);
2095 }
2096
2097 if ((new = dt_zalloc(dtp, sizeof (dt_lib_depend_t))) == NULL)
2098 return (-1);
2099
2100 if ((new->dtld_library = strdup(dld->dtld_library)) == NULL) {
2101 dt_free(dtp, new);
2102 return (dt_set_errno(dtp, EDT_NOMEM));
2103 }
2104
2105 new->dtld_start = dld->dtld_start;
2106 new->dtld_finish = dld->dtld_finish = ++(*count);
2107 dt_list_prepend(&dtp->dt_lib_dep_sorted, new);
2108
2109 dt_dprintf("library %s sorted (%d/%d)\n", new->dtld_library,
2110 new->dtld_start, new->dtld_finish);
2111
2112 return (0);
2113 }
2114
2115 static int
dt_lib_depend_sort(dtrace_hdl_t * dtp)2116 dt_lib_depend_sort(dtrace_hdl_t *dtp)
2117 {
2118 dt_lib_depend_t *dld, *dpld, *dlda;
2119 int count = 0;
2120
2121 if (dt_lib_build_graph(dtp) == -1)
2122 return (-1); /* preserve dt_errno */
2123
2124 /*
2125 * Perform a topological sort of the graph that hangs off
2126 * dtp->dt_lib_dep. The result of this process will be a
2127 * dependency ordered list located at dtp->dt_lib_dep_sorted.
2128 */
2129 for (dld = dt_list_next(&dtp->dt_lib_dep); dld != NULL;
2130 dld = dt_list_next(dld)) {
2131 if (dld->dtld_start == 0 &&
2132 dt_topo_sort(dtp, dld, &count) == -1)
2133 return (-1); /* preserve dt_errno */;
2134 }
2135
2136 /*
2137 * Check the graph for cycles. If an ancestor's finishing time is
2138 * less than any of its dependent's finishing times then a back edge
2139 * exists in the graph and this is a cycle.
2140 */
2141 for (dld = dt_list_next(&dtp->dt_lib_dep); dld != NULL;
2142 dld = dt_list_next(dld)) {
2143 for (dpld = dt_list_next(&dld->dtld_dependents); dpld != NULL;
2144 dpld = dt_list_next(dpld)) {
2145 dlda = dt_lib_depend_lookup(&dtp->dt_lib_dep_sorted,
2146 dpld->dtld_library);
2147 assert(dlda != NULL);
2148
2149 if (dlda->dtld_finish > dld->dtld_finish) {
2150 dt_lib_depend_error(dtp,
2151 "Cyclic dependency detected: %s => %s\n",
2152 dld->dtld_library, dpld->dtld_library);
2153
2154 return (dt_set_errno(dtp, EDT_COMPILER));
2155 }
2156 }
2157 }
2158
2159 return (0);
2160 }
2161
2162 static void
dt_lib_depend_free(dtrace_hdl_t * dtp)2163 dt_lib_depend_free(dtrace_hdl_t *dtp)
2164 {
2165 dt_lib_depend_t *dld, *dlda;
2166
2167 while ((dld = dt_list_next(&dtp->dt_lib_dep)) != NULL) {
2168 while ((dlda = dt_list_next(&dld->dtld_dependencies)) != NULL) {
2169 dt_list_delete(&dld->dtld_dependencies, dlda);
2170 dt_free(dtp, dlda->dtld_library);
2171 dt_free(dtp, dlda->dtld_libpath);
2172 dt_free(dtp, dlda);
2173 }
2174 while ((dlda = dt_list_next(&dld->dtld_dependents)) != NULL) {
2175 dt_list_delete(&dld->dtld_dependents, dlda);
2176 dt_free(dtp, dlda->dtld_library);
2177 dt_free(dtp, dlda->dtld_libpath);
2178 dt_free(dtp, dlda);
2179 }
2180 dt_list_delete(&dtp->dt_lib_dep, dld);
2181 dt_free(dtp, dld->dtld_library);
2182 dt_free(dtp, dld->dtld_libpath);
2183 dt_free(dtp, dld);
2184 }
2185
2186 while ((dld = dt_list_next(&dtp->dt_lib_dep_sorted)) != NULL) {
2187 dt_list_delete(&dtp->dt_lib_dep_sorted, dld);
2188 dt_free(dtp, dld->dtld_library);
2189 dt_free(dtp, dld);
2190 }
2191 }
2192
2193 /*
2194 * Open all the .d library files found in the specified directory and
2195 * compile each one of them. We silently ignore any missing directories and
2196 * other files found therein. We only fail (and thereby fail dt_load_libs()) if
2197 * we fail to compile a library and the error is something other than #pragma D
2198 * depends_on. Dependency errors are silently ignored to permit a library
2199 * directory to contain libraries which may not be accessible depending on our
2200 * privileges.
2201 */
2202 static int
dt_load_libs_dir(dtrace_hdl_t * dtp,const char * path)2203 dt_load_libs_dir(dtrace_hdl_t *dtp, const char *path)
2204 {
2205 struct dirent *dp;
2206 const char *p, *end;
2207 DIR *dirp;
2208
2209 char fname[PATH_MAX];
2210 FILE *fp;
2211 void *rv;
2212 dt_lib_depend_t *dld;
2213
2214 if ((dirp = opendir(path)) == NULL) {
2215 dt_dprintf("skipping lib dir %s: %s\n", path, strerror(errno));
2216 return (0);
2217 }
2218
2219 /* First, parse each file for library dependencies. */
2220 while ((dp = readdir(dirp)) != NULL) {
2221 if ((p = strrchr(dp->d_name, '.')) == NULL || strcmp(p, ".d"))
2222 continue; /* skip any filename not ending in .d */
2223
2224 (void) snprintf(fname, sizeof (fname),
2225 "%s/%s", path, dp->d_name);
2226
2227 if ((fp = fopen(fname, "r")) == NULL) {
2228 dt_dprintf("skipping library %s: %s\n",
2229 fname, strerror(errno));
2230 continue;
2231 }
2232
2233 /*
2234 * Skip files whose name match an already processed library
2235 */
2236 for (dld = dt_list_next(&dtp->dt_lib_dep); dld != NULL;
2237 dld = dt_list_next(dld)) {
2238 end = strrchr(dld->dtld_library, '/');
2239 /* dt_lib_depend_add ensures this */
2240 assert(end != NULL);
2241 if (strcmp(end + 1, dp->d_name) == 0)
2242 break;
2243 }
2244
2245 if (dld != NULL) {
2246 dt_dprintf("skipping library %s, already processed "
2247 "library with the same name: %s", dp->d_name,
2248 dld->dtld_library);
2249 (void) fclose(fp);
2250 continue;
2251 }
2252
2253 dtp->dt_filetag = fname;
2254 if (dt_lib_depend_add(dtp, &dtp->dt_lib_dep, fname) != 0) {
2255 (void) fclose(fp);
2256 return (-1); /* preserve dt_errno */
2257 }
2258
2259 rv = dt_compile(dtp, DT_CTX_DPROG,
2260 DTRACE_PROBESPEC_NAME, NULL,
2261 DTRACE_C_EMPTY | DTRACE_C_CTL, 0, NULL, fp, NULL);
2262
2263 if (rv != NULL && dtp->dt_errno &&
2264 (dtp->dt_errno != EDT_COMPILER ||
2265 dtp->dt_errtag != dt_errtag(D_PRAGMA_DEPEND))) {
2266 (void) fclose(fp);
2267 return (-1); /* preserve dt_errno */
2268 }
2269
2270 if (dtp->dt_errno)
2271 dt_dprintf("error parsing library %s: %s\n",
2272 fname, dtrace_errmsg(dtp, dtrace_errno(dtp)));
2273
2274 (void) fclose(fp);
2275 dtp->dt_filetag = NULL;
2276 }
2277
2278 (void) closedir(dirp);
2279
2280 return (0);
2281 }
2282
2283 /*
2284 * Perform a topological sorting of all the libraries found across the entire
2285 * dt_lib_path. Once sorted, compile each one in topological order to cache its
2286 * inlines and translators, etc. We silently ignore any missing directories and
2287 * other files found therein. We only fail (and thereby fail dt_load_libs()) if
2288 * we fail to compile a library and the error is something other than #pragma D
2289 * depends_on. Dependency errors are silently ignored to permit a library
2290 * directory to contain libraries which may not be accessible depending on our
2291 * privileges.
2292 */
2293 static int
dt_load_libs_sort(dtrace_hdl_t * dtp)2294 dt_load_libs_sort(dtrace_hdl_t *dtp)
2295 {
2296 dtrace_prog_t *pgp;
2297 FILE *fp;
2298 dt_lib_depend_t *dld;
2299
2300 /*
2301 * Finish building the graph containing the library dependencies
2302 * and perform a topological sort to generate an ordered list
2303 * for compilation.
2304 */
2305 if (dt_lib_depend_sort(dtp) == -1)
2306 goto err;
2307
2308 for (dld = dt_list_next(&dtp->dt_lib_dep_sorted); dld != NULL;
2309 dld = dt_list_next(dld)) {
2310
2311 if ((fp = fopen(dld->dtld_library, "r")) == NULL) {
2312 dt_dprintf("skipping library %s: %s\n",
2313 dld->dtld_library, strerror(errno));
2314 continue;
2315 }
2316
2317 dtp->dt_filetag = dld->dtld_library;
2318 pgp = dtrace_program_fcompile(dtp, fp, DTRACE_C_EMPTY, 0, NULL);
2319 (void) fclose(fp);
2320 dtp->dt_filetag = NULL;
2321
2322 if (pgp == NULL && (dtp->dt_errno != EDT_COMPILER ||
2323 dtp->dt_errtag != dt_errtag(D_PRAGMA_DEPEND)))
2324 goto err;
2325
2326 if (pgp == NULL) {
2327 dt_dprintf("skipping library %s: %s\n",
2328 dld->dtld_library,
2329 dtrace_errmsg(dtp, dtrace_errno(dtp)));
2330 } else {
2331 dld->dtld_loaded = B_TRUE;
2332 dt_program_destroy(dtp, pgp);
2333 }
2334 }
2335
2336 dt_lib_depend_free(dtp);
2337 return (0);
2338
2339 err:
2340 dt_lib_depend_free(dtp);
2341 return (-1); /* preserve dt_errno */
2342 }
2343
2344 /*
2345 * Load the contents of any appropriate DTrace .d library files. These files
2346 * contain inlines and translators that will be cached by the compiler. We
2347 * defer this activity until the first compile to permit libdtrace clients to
2348 * add their own library directories and so that we can properly report errors.
2349 */
2350 static int
dt_load_libs(dtrace_hdl_t * dtp)2351 dt_load_libs(dtrace_hdl_t *dtp)
2352 {
2353 dt_dirpath_t *dirp;
2354
2355 if (dtp->dt_cflags & DTRACE_C_NOLIBS)
2356 return (0); /* libraries already processed */
2357
2358 dtp->dt_cflags |= DTRACE_C_NOLIBS;
2359
2360 /*
2361 * /usr/lib/dtrace is always at the head of the list. The rest of the
2362 * list is specified in the precedence order the user requested. Process
2363 * everything other than the head first. DTRACE_C_NOLIBS has already
2364 * been spcified so dt_vopen will ensure that there is always one entry
2365 * in dt_lib_path.
2366 */
2367 for (dirp = dt_list_next(dt_list_next(&dtp->dt_lib_path));
2368 dirp != NULL; dirp = dt_list_next(dirp)) {
2369 if (dt_load_libs_dir(dtp, dirp->dir_path) != 0) {
2370 dtp->dt_cflags &= ~DTRACE_C_NOLIBS;
2371 return (-1); /* errno is set for us */
2372 }
2373 }
2374
2375 /* Handle /usr/lib/dtrace */
2376 dirp = dt_list_next(&dtp->dt_lib_path);
2377 if (dt_load_libs_dir(dtp, dirp->dir_path) != 0) {
2378 dtp->dt_cflags &= ~DTRACE_C_NOLIBS;
2379 return (-1); /* errno is set for us */
2380 }
2381
2382 if (dt_load_libs_sort(dtp) < 0)
2383 return (-1); /* errno is set for us */
2384
2385 return (0);
2386 }
2387
2388 static void *
dt_compile(dtrace_hdl_t * dtp,int context,dtrace_probespec_t pspec,void * arg,uint_t cflags,int argc,char * const argv[],FILE * fp,const char * s)2389 dt_compile(dtrace_hdl_t *dtp, int context, dtrace_probespec_t pspec, void *arg,
2390 uint_t cflags, int argc, char *const argv[], FILE *fp, const char *s)
2391 {
2392 dt_node_t *dnp;
2393 dt_decl_t *ddp;
2394 dt_pcb_t pcb;
2395 void *volatile rv;
2396 int err;
2397
2398 if ((fp == NULL && s == NULL) || (cflags & ~DTRACE_C_MASK) != 0) {
2399 (void) dt_set_errno(dtp, EINVAL);
2400 return (NULL);
2401 }
2402
2403 if (dt_list_next(&dtp->dt_lib_path) != NULL && dt_load_libs(dtp) != 0)
2404 return (NULL); /* errno is set for us */
2405
2406 if (dtp->dt_globals->dh_nelems != 0)
2407 (void) dt_idhash_iter(dtp->dt_globals, dt_idreset, NULL);
2408
2409 if (dtp->dt_tls->dh_nelems != 0)
2410 (void) dt_idhash_iter(dtp->dt_tls, dt_idreset, NULL);
2411
2412 if (fp && (cflags & DTRACE_C_CPP) && (fp = dt_preproc(dtp, fp)) == NULL)
2413 return (NULL); /* errno is set for us */
2414
2415 dt_pcb_push(dtp, &pcb);
2416
2417 pcb.pcb_fileptr = fp;
2418 pcb.pcb_string = s;
2419 pcb.pcb_strptr = s;
2420 pcb.pcb_strlen = s ? strlen(s) : 0;
2421 pcb.pcb_sargc = argc;
2422 pcb.pcb_sargv = argv;
2423 pcb.pcb_sflagv = argc ? calloc(argc, sizeof (ushort_t)) : NULL;
2424 pcb.pcb_pspec = pspec;
2425 pcb.pcb_cflags = dtp->dt_cflags | cflags;
2426 pcb.pcb_amin = dtp->dt_amin;
2427 pcb.pcb_yystate = -1;
2428 pcb.pcb_context = context;
2429 pcb.pcb_token = context;
2430
2431 if (context != DT_CTX_DPROG)
2432 yybegin(YYS_EXPR);
2433 else if (cflags & DTRACE_C_CTL)
2434 yybegin(YYS_CONTROL);
2435 else
2436 yybegin(YYS_CLAUSE);
2437
2438 if ((err = setjmp(yypcb->pcb_jmpbuf)) != 0)
2439 goto out;
2440
2441 if (yypcb->pcb_sargc != 0 && yypcb->pcb_sflagv == NULL)
2442 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
2443
2444 yypcb->pcb_idents = dt_idhash_create("ambiguous", NULL, 0, 0);
2445 yypcb->pcb_locals = dt_idhash_create("clause local", NULL,
2446 DIF_VAR_OTHER_UBASE, DIF_VAR_OTHER_MAX);
2447
2448 if (yypcb->pcb_idents == NULL || yypcb->pcb_locals == NULL)
2449 longjmp(yypcb->pcb_jmpbuf, EDT_NOMEM);
2450
2451 /*
2452 * Invoke the parser to evaluate the D source code. If any errors
2453 * occur during parsing, an error function will be called and we
2454 * will longjmp back to pcb_jmpbuf to abort. If parsing succeeds,
2455 * we optionally display the parse tree if debugging is enabled.
2456 */
2457 if (yyparse() != 0 || yypcb->pcb_root == NULL)
2458 xyerror(D_EMPTY, "empty D program translation unit\n");
2459
2460 yybegin(YYS_DONE);
2461
2462 if (cflags & DTRACE_C_CTL)
2463 goto out;
2464
2465 if (context != DT_CTX_DTYPE && DT_TREEDUMP_PASS(dtp, 1))
2466 dt_node_printr(yypcb->pcb_root, stderr, 0);
2467
2468 if (yypcb->pcb_pragmas != NULL)
2469 (void) dt_idhash_iter(yypcb->pcb_pragmas, dt_idpragma, NULL);
2470
2471 if (argc > 1 && !(yypcb->pcb_cflags & DTRACE_C_ARGREF) &&
2472 !(yypcb->pcb_sflagv[argc - 1] & DT_IDFLG_REF)) {
2473 xyerror(D_MACRO_UNUSED, "extraneous argument '%s' ($%d is "
2474 "not referenced)\n", yypcb->pcb_sargv[argc - 1], argc - 1);
2475 }
2476
2477 /*
2478 * Perform sugar transformations (for "if" / "else") and replace the
2479 * existing clause chain with the new one.
2480 */
2481 if (context == DT_CTX_DPROG) {
2482 dt_node_t *dnp, *next_dnp;
2483 dt_node_t *new_list = NULL;
2484
2485 for (dnp = yypcb->pcb_root->dn_list;
2486 dnp != NULL; dnp = next_dnp) {
2487 /* remove this node from the list */
2488 next_dnp = dnp->dn_list;
2489 dnp->dn_list = NULL;
2490
2491 if (dnp->dn_kind == DT_NODE_CLAUSE)
2492 dnp = dt_compile_sugar(dtp, dnp);
2493 /* append node to the new list */
2494 new_list = dt_node_link(new_list, dnp);
2495 }
2496 yypcb->pcb_root->dn_list = new_list;
2497 }
2498
2499 /*
2500 * If we have successfully created a parse tree for a D program, loop
2501 * over the clauses and actions and instantiate the corresponding
2502 * libdtrace program. If we are parsing a D expression, then we
2503 * simply run the code generator and assembler on the resulting tree.
2504 */
2505 switch (context) {
2506 case DT_CTX_DPROG:
2507 assert(yypcb->pcb_root->dn_kind == DT_NODE_PROG);
2508
2509 if ((dnp = yypcb->pcb_root->dn_list) == NULL &&
2510 !(yypcb->pcb_cflags & DTRACE_C_EMPTY))
2511 xyerror(D_EMPTY, "empty D program translation unit\n");
2512
2513 if ((yypcb->pcb_prog = dt_program_create(dtp)) == NULL)
2514 longjmp(yypcb->pcb_jmpbuf, dtrace_errno(dtp));
2515
2516 for (; dnp != NULL; dnp = dnp->dn_list) {
2517 switch (dnp->dn_kind) {
2518 case DT_NODE_CLAUSE:
2519 if (DT_TREEDUMP_PASS(dtp, 4))
2520 dt_printd(dnp, stderr, 0);
2521 dt_compile_clause(dtp, dnp);
2522 break;
2523 case DT_NODE_XLATOR:
2524 if (dtp->dt_xlatemode == DT_XL_DYNAMIC)
2525 dt_compile_xlator(dnp);
2526 break;
2527 case DT_NODE_PROVIDER:
2528 (void) dt_node_cook(dnp, DT_IDFLG_REF);
2529 break;
2530 }
2531 }
2532
2533 yypcb->pcb_prog->dp_xrefs = yypcb->pcb_asxrefs;
2534 yypcb->pcb_prog->dp_xrefslen = yypcb->pcb_asxreflen;
2535 yypcb->pcb_asxrefs = NULL;
2536 yypcb->pcb_asxreflen = 0;
2537
2538 rv = yypcb->pcb_prog;
2539 break;
2540
2541 case DT_CTX_DEXPR:
2542 (void) dt_node_cook(yypcb->pcb_root, DT_IDFLG_REF);
2543 dt_cg(yypcb, yypcb->pcb_root);
2544 rv = dt_as(yypcb);
2545 break;
2546
2547 case DT_CTX_DTYPE:
2548 ddp = (dt_decl_t *)yypcb->pcb_root; /* root is really a decl */
2549 err = dt_decl_type(ddp, arg);
2550 dt_decl_free(ddp);
2551
2552 if (err != 0)
2553 longjmp(yypcb->pcb_jmpbuf, EDT_COMPILER);
2554
2555 rv = NULL;
2556 break;
2557 }
2558
2559 out:
2560 if (context != DT_CTX_DTYPE && yypcb->pcb_root != NULL &&
2561 DT_TREEDUMP_PASS(dtp, 3))
2562 dt_node_printr(yypcb->pcb_root, stderr, 0);
2563
2564 if (dtp->dt_cdefs_fd != -1 && (ftruncate64(dtp->dt_cdefs_fd, 0) == -1 ||
2565 lseek64(dtp->dt_cdefs_fd, 0, SEEK_SET) == -1 ||
2566 ctf_write(dtp->dt_cdefs->dm_ctfp, dtp->dt_cdefs_fd) == CTF_ERR))
2567 dt_dprintf("failed to update CTF cache: %s\n", strerror(errno));
2568
2569 if (dtp->dt_ddefs_fd != -1 && (ftruncate64(dtp->dt_ddefs_fd, 0) == -1 ||
2570 lseek64(dtp->dt_ddefs_fd, 0, SEEK_SET) == -1 ||
2571 ctf_write(dtp->dt_ddefs->dm_ctfp, dtp->dt_ddefs_fd) == CTF_ERR))
2572 dt_dprintf("failed to update CTF cache: %s\n", strerror(errno));
2573
2574 if (yypcb->pcb_fileptr && (cflags & DTRACE_C_CPP))
2575 (void) fclose(yypcb->pcb_fileptr); /* close dt_preproc() file */
2576
2577 dt_pcb_pop(dtp, err);
2578 (void) dt_set_errno(dtp, err);
2579 return (err ? NULL : rv);
2580 }
2581
2582 dtrace_prog_t *
dtrace_program_strcompile(dtrace_hdl_t * dtp,const char * s,dtrace_probespec_t spec,uint_t cflags,int argc,char * const argv[])2583 dtrace_program_strcompile(dtrace_hdl_t *dtp, const char *s,
2584 dtrace_probespec_t spec, uint_t cflags, int argc, char *const argv[])
2585 {
2586 return (dt_compile(dtp, DT_CTX_DPROG,
2587 spec, NULL, cflags, argc, argv, NULL, s));
2588 }
2589
2590 dtrace_prog_t *
dtrace_program_fcompile(dtrace_hdl_t * dtp,FILE * fp,uint_t cflags,int argc,char * const argv[])2591 dtrace_program_fcompile(dtrace_hdl_t *dtp, FILE *fp,
2592 uint_t cflags, int argc, char *const argv[])
2593 {
2594 return (dt_compile(dtp, DT_CTX_DPROG,
2595 DTRACE_PROBESPEC_NAME, NULL, cflags, argc, argv, fp, NULL));
2596 }
2597
2598 int
dtrace_type_strcompile(dtrace_hdl_t * dtp,const char * s,dtrace_typeinfo_t * dtt)2599 dtrace_type_strcompile(dtrace_hdl_t *dtp, const char *s, dtrace_typeinfo_t *dtt)
2600 {
2601 (void) dt_compile(dtp, DT_CTX_DTYPE,
2602 DTRACE_PROBESPEC_NONE, dtt, 0, 0, NULL, NULL, s);
2603 return (dtp->dt_errno ? -1 : 0);
2604 }
2605
2606 int
dtrace_type_fcompile(dtrace_hdl_t * dtp,FILE * fp,dtrace_typeinfo_t * dtt)2607 dtrace_type_fcompile(dtrace_hdl_t *dtp, FILE *fp, dtrace_typeinfo_t *dtt)
2608 {
2609 (void) dt_compile(dtp, DT_CTX_DTYPE,
2610 DTRACE_PROBESPEC_NONE, dtt, 0, 0, NULL, fp, NULL);
2611 return (dtp->dt_errno ? -1 : 0);
2612 }
2613