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