output.c

   1 /*
   2  * This file is part of ltrace.
   3  * Copyright (C) 2011,2012,2013,2014 Petr Machata, Red Hat Inc.
   4  * Copyright (C) 2010 Joe Damato
   5  * Copyright (C) 1997,1998,1999,2001,2002,2003,2004,2007,2008,2009 Juan Cespedes
   6  * Copyright (C) 2006 Paul Gilliam, IBM Corporation
   7  * Copyright (C) 2006 Ian Wienand
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  */
  24
  25 #include "config.h"
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <stdarg.h>
  30 #include <string.h>
  31 #include <time.h>
  32 #include <sys/time.h>
  33 #include <unistd.h>
  34 #include <errno.h>
  35 #include <assert.h>
  36 #include <inttypes.h>
  37
  38 #include "output.h"
  39 #include "demangle.h"
  40 #include "fetch.h"
  41 #include "lens_default.h"
  42 #include "library.h"
  43 #include "memstream.h"
  44 #include "options.h"
  45 #include "param.h"
  46 #include "proc.h"
  47 #include "prototype.h"
  48 #include "summary.h"
  49 #include "type.h"
  50 #include "value.h"
  51 #include "value_dict.h"
  52 #include "filter.h"
  53
  54 #if defined(HAVE_LIBDW)
  55 #include "dwarf_prototypes.h"
  56 #endif
  57
  58 static struct process *current_proc = NULL;
  59 static size_t current_depth = 0;
  60 static int current_column = 0;
  61
  62 static void
  63 output_indent(struct process *proc)
  64 {
  65         int d = options.indent * (proc->callstack_depth - 1);
  66         current_column += fprintf(options.output, "%*s", d, "");
  67 }
  68
  69 static void
  70 begin_of_line(struct process *proc, int is_func, int indent)
  71 {
  72         current_column = 0;
  73         if (!proc) {
  74                 return;
  75         }
  76         if ((options.output != stderr) && (opt_p || options.follow)) {
  77                 current_column += fprintf(options.output, "%u ", proc->pid);
  78         } else if (options.follow) {
  79                 current_column += fprintf(options.output, "[pid %u] ", proc->pid);
  80         }
  81         if (opt_r) {
  82                 struct timeval tv;
  83                 static struct timeval old_tv = { 0, 0 };
  84                 struct timeval diff;
  85
  86                 gettimeofday(&tv, NULL);
  87
  88                 if (old_tv.tv_sec == 0 && old_tv.tv_usec == 0) {
  89                         old_tv.tv_sec = tv.tv_sec;
  90                         old_tv.tv_usec = tv.tv_usec;
  91                 }
  92                 diff.tv_sec = tv.tv_sec - old_tv.tv_sec;
  93                 if (tv.tv_usec >= old_tv.tv_usec) {
  94                         diff.tv_usec = tv.tv_usec - old_tv.tv_usec;
  95                 } else {
  96                         diff.tv_sec--;
  97                         diff.tv_usec = 1000000 + tv.tv_usec - old_tv.tv_usec;
  98                 }
  99                 old_tv.tv_sec = tv.tv_sec;
 100                 old_tv.tv_usec = tv.tv_usec;
 101                 current_column += fprintf(options.output, "%3lu.%06d ",
 102                                           (unsigned long)diff.tv_sec,
 103                                           (int)diff.tv_usec);
 104         }
 105         if (opt_t) {
 106                 struct timeval tv;
 107                 gettimeofday(&tv, NULL);
 108                 if (opt_t > 2) {
 109                         current_column += fprintf(options.output, "%lu.%06d ",
 110                                                   (unsigned long)tv.tv_sec,
 111                                                   (int)tv.tv_usec);
 112                 } else if (opt_t > 1) {
 113                         struct tm *tmp = localtime(&tv.tv_sec);
 114                         current_column +=
 115                             fprintf(options.output, "%02d:%02d:%02d.%06d ",
 116                                     tmp->tm_hour, tmp->tm_min, tmp->tm_sec,
 117                                     (int)tv.tv_usec);
 118                 } else {
 119                         struct tm *tmp = localtime(&tv.tv_sec);
 120                         current_column += fprintf(options.output, "%02d:%02d:%02d ",
 121                                                   tmp->tm_hour, tmp->tm_min,
 122                                                   tmp->tm_sec);
 123                 }
 124         }
 125         if (opt_i) {
 126                 if (is_func) {
 127                         struct callstack_element *stel
 128                                 = &proc->callstack[proc->callstack_depth - 1];
 129                         current_column += fprintf(options.output, "[%p] ",
 130                                                   stel->return_addr);
 131                 } else {
 132                         current_column += fprintf(options.output, "[%p] ",
 133                                                   proc->instruction_pointer);
 134                 }
 135         }
 136         if (options.indent > 0 && indent) {
 137                 output_indent(proc);
 138         }
 139 }
 140
 141 static struct arg_type_info *
 142 get_unknown_type(void)
 143 {
 144         static struct arg_type_info *ret = NULL;
 145         if (ret != NULL)
 146                 return ret;
 147
 148         static struct arg_type_info info;
 149         info = *type_get_simple(ARGTYPE_LONG);
 150         info.lens = &guess_lens;
 151         ret = &info;
 152         return ret;
 153 }
 154
 155 /* The default prototype is: long X(long, long, long, long).  */
 156 static struct prototype *
 157 build_default_prototype(void)
 158 {
 159         static struct prototype *ret = NULL;
 160         if (ret != NULL)
 161                 return ret;
 162
 163         static struct prototype proto;
 164         prototype_init(&proto);
 165
 166         struct arg_type_info *unknown_type = get_unknown_type();
 167         assert(unknown_type != NULL);
 168         proto.return_info = unknown_type;
 169         proto.own_return_info = 0;
 170
 171         struct param unknown_param;
 172         param_init_type(&unknown_param, unknown_type, 0);
 173
 174         size_t i;
 175         for (i = 0; i < 4; ++i)
 176                 if (prototype_push_param(&proto, &unknown_param) < 0) {
 177                         report_global_error("build_default_prototype: %s",
 178                                             strerror(errno));
 179                         prototype_destroy(&proto);
 180                         return NULL;
 181                 }
 182
 183         ret = &proto;
 184         return ret;
 185 }
 186
 187 static bool
 188 snip_period(char *buf)
 189 {
 190         char *period = strrchr(buf, '.');
 191         if (period != NULL && strcmp(period, ".so") != 0) {
 192                 *period = 0;
 193                 return true;
 194         } else {
 195                 return false;
 196         }
 197 }
 198
 199 static struct prototype *
 200 library_get_prototype(struct library *lib, const char *name)
 201 {
 202         if (lib->protolib == NULL) {
 203                 size_t sz = strlen(lib->soname);
 204                 char buf[sz + 1];
 205                 memcpy(buf, lib->soname, sz + 1);
 206
 207                 do {
 208                         if (protolib_cache_maybe_load(&g_protocache, buf, 0,
 209                                                       true, &lib->protolib) < 0)
 210                                 return NULL;
 211                 } while (lib->protolib == NULL
 212                          && lib->type == LT_LIBTYPE_DSO
 213                          && snip_period(buf));
 214
 215 #if defined(HAVE_LIBDW)
 216                 if (lib->protolib == NULL && lib->dwfl != NULL &&
 217                         (filter_matches_library(options.plt_filter,    lib ) ||
 218                          filter_matches_library(options.static_filter, lib ) ||
 219                          filter_matches_library(options.export_filter, lib )))
 220                         import_DWARF_prototypes(lib);
 221 #endif
 222
 223                 if (lib->protolib == NULL)
 224                         lib->protolib = protolib_cache_default(&g_protocache,
 225                                                                buf, 0);
 226         }
 227         if (lib->protolib == NULL)
 228                 return NULL;
 229
 230         return protolib_lookup_prototype(lib->protolib, name,
 231                                          lib->type != LT_LIBTYPE_SYSCALL);
 232 }
 233
 234 struct find_proto_data {
 235         const char *name;
 236         struct prototype *ret;
 237 };
 238
 239 static enum callback_status
 240 find_proto_cb(struct process *proc, struct library *lib, void *d)
 241 {
 242         struct find_proto_data *data = d;
 243         data->ret = library_get_prototype(lib, data->name);
 244         return CBS_STOP_IF(data->ret != NULL);
 245 }
 246
 247 static struct prototype *
 248 lookup_symbol_prototype(struct process *proc, struct library_symbol *libsym)
 249 {
 250         if (libsym->proto != NULL)
 251                 return libsym->proto;
 252
 253         struct library *lib = libsym->lib;
 254         if (lib != NULL) {
 255                 struct find_proto_data data = { libsym->name };
 256                 data.ret = library_get_prototype(lib, libsym->name);
 257                 if (data.ret == NULL
 258                     && libsym->plt_type == LS_TOPLT_EXEC)
 259                         proc_each_library(proc, NULL, find_proto_cb, &data);
 260                 if (data.ret != NULL)
 261                         return data.ret;
 262         }
 263
 264         return build_default_prototype();
 265 }
 266
 267 void
 268 output_line(struct process *proc, const char *fmt, ...)
 269 {
 270         if (options.summary)
 271                 return;
 272
 273         if (current_proc != NULL) {
 274                 if (current_proc->callstack[current_depth].return_addr)
 275                         fprintf(options.output, " <unfinished ...>\n");
 276                 else
 277                         fprintf(options.output, " <no return ...>\n");
 278         }
 279         current_proc = NULL;
 280         if (fmt == NULL)
 281                 return;
 282
 283         begin_of_line(proc, 0, 0);
 284
 285         va_list args;
 286         va_start(args, fmt);
 287         vfprintf(options.output, fmt, args);
 288         fprintf(options.output, "\n");
 289         va_end(args);
 290
 291         current_column = 0;
 292 }
 293
 294 static void
 295 tabto(int col) {
 296         if (current_column < col) {
 297                 fprintf(options.output, "%*s", col - current_column, "");
 298         }
 299 }
 300
 301 static int
 302 output_error(FILE *stream)
 303 {
 304         return fprintf(stream, "?");
 305 }
 306
 307 static int
 308 fetch_simple_param(enum tof type, struct process *proc,
 309                    struct fetch_context *context,
 310                    struct value_dict *arguments,
 311                    struct arg_type_info *info, int own,
 312                    struct value *valuep)
 313 {
 314         /* Arrays decay into pointers per C standard.  We check for
 315          * this here, because here we also capture arrays that come
 316          * from parameter packs.  */
 317         if (info->type == ARGTYPE_ARRAY) {
 318                 struct arg_type_info *tmp = malloc(sizeof(*tmp));
 319                 if (tmp != NULL) {
 320                         type_init_pointer(tmp, info, own);
 321                         tmp->lens = info->lens;
 322                         info = tmp;
 323                         own = 1;
 324                 }
 325         }
 326
 327         struct value value;
 328         value_init(&value, proc, NULL, info, own);
 329         if (fetch_arg_next(context, type, proc, info, &value) < 0)
 330                 return -1;
 331
 332         if (val_dict_push_next(arguments, &value) < 0) {
 333                 value_destroy(&value);
 334                 return -1;
 335         }
 336
 337         if (valuep != NULL)
 338                 *valuep = value;
 339
 340         return 0;
 341 }
 342
 343 static void
 344 fetch_param_stop(struct value_dict *arguments, ssize_t *params_leftp)
 345 {
 346         if (*params_leftp == -1)
 347                 *params_leftp = val_dict_count(arguments);
 348 }
 349
 350 static int
 351 fetch_param_pack(enum tof type, struct process *proc,
 352                  struct fetch_context *context,
 353                  struct value_dict *arguments, struct param *param,
 354                  ssize_t *params_leftp)
 355 {
 356         struct param_enum *e = param_pack_init(param, arguments);
 357         if (e == NULL)
 358                 return -1;
 359
 360         int ret = 0;
 361         while (1) {
 362                 int insert_stop = 0;
 363                 struct arg_type_info *info = malloc(sizeof(*info));
 364                 if (info == NULL
 365                     || param_pack_next(param, e, info, &insert_stop) < 0) {
 366                 fail:
 367                         free(info);
 368                         ret = -1;
 369                         break;
 370                 }
 371
 372                 if (insert_stop)
 373                         fetch_param_stop(arguments, params_leftp);
 374
 375                 if (info->type == ARGTYPE_VOID) {
 376                         type_destroy(info);
 377                         free(info);
 378                         break;
 379                 }
 380
 381                 struct value val;
 382                 if (fetch_simple_param(type, proc, context, arguments,
 383                                        info, 1, &val) < 0)
 384                         goto fail;
 385
 386                 int stop = 0;
 387                 switch (param_pack_stop(param, e, &val)) {
 388                 case PPCB_ERR:
 389                         goto fail;
 390                 case PPCB_STOP:
 391                         stop = 1;
 392                 case PPCB_CONT:
 393                         break;
 394                 }
 395
 396                 if (stop)
 397                         break;
 398         }
 399
 400         param_pack_done(param, e);
 401         return ret;
 402 }
 403
 404 static int
 405 fetch_one_param(enum tof type, struct process *proc,
 406                 struct fetch_context *context,
 407                 struct value_dict *arguments, struct param *param,
 408                 ssize_t *params_leftp)
 409 {
 410         switch (param->flavor) {
 411                 int rc;
 412         case PARAM_FLAVOR_TYPE:
 413                 return fetch_simple_param(type, proc, context, arguments,
 414                                           param->u.type.type, 0, NULL);
 415
 416         case PARAM_FLAVOR_PACK:
 417                 if (fetch_param_pack_start(context,
 418                                            param->u.pack.ppflavor) < 0)
 419                         return -1;
 420                 rc = fetch_param_pack(type, proc, context, arguments,
 421                                       param, params_leftp);
 422                 fetch_param_pack_end(context);
 423                 return rc;
 424
 425         case PARAM_FLAVOR_STOP:
 426                 fetch_param_stop(arguments, params_leftp);
 427                 return 0;
 428         }
 429
 430         assert(!"Invalid param flavor!");
 431         abort();
 432 }
 433
 434 struct fetch_one_param_data
 435 {
 436         struct process *proc;
 437         struct fetch_context *context;
 438         struct value_dict *arguments;
 439         ssize_t *params_leftp;
 440         enum tof tof;
 441 };
 442
 443 static enum callback_status
 444 fetch_one_param_cb(struct prototype *proto, struct param *param, void *data)
 445 {
 446         struct fetch_one_param_data *cb_data = data;
 447         return CBS_STOP_IF(fetch_one_param(cb_data->tof, cb_data->proc,
 448                                            cb_data->context,
 449                                            cb_data->arguments, param,
 450                                            cb_data->params_leftp) < 0);
 451 }
 452
 453 static int
 454 fetch_params(enum tof type, struct process *proc,
 455              struct fetch_context *context,
 456              struct value_dict *arguments, struct prototype *func,
 457              ssize_t *params_leftp)
 458 {
 459         struct fetch_one_param_data cb_data
 460                 = { proc, context, arguments, params_leftp, type };
 461         if (prototype_each_param(func, NULL,
 462                                  &fetch_one_param_cb, &cb_data) != NULL)
 463                 return -1;
 464
 465         /* Implicit stop at the end of parameter list.  */
 466         fetch_param_stop(arguments, params_leftp);
 467
 468         return 0;
 469 }
 470
 471 struct format_argument_data
 472 {
 473         struct value *value;
 474         struct value_dict *arguments;
 475 };
 476
 477 static int
 478 format_argument_cb(FILE *stream, void *ptr)
 479 {
 480         struct format_argument_data *data = ptr;
 481         int o = format_argument(stream, data->value, data->arguments);
 482         if (o < 0)
 483                 o = output_error(stream);
 484         return o;
 485 }
 486
 487 static int
 488 output_params(struct value_dict *arguments, size_t start, size_t end,
 489               int *need_delimp)
 490 {
 491         size_t i;
 492         for (i = start; i < end; ++i) {
 493                 struct value *value = val_dict_get_num(arguments, i);
 494                 if (value == NULL)
 495                         return -1;
 496
 497                 struct format_argument_data data = { value, arguments };
 498                 int o = delim_output(options.output, need_delimp,
 499                                      format_argument_cb, &data);
 500                 if (o < 0)
 501                         return -1;
 502                 current_column += o;
 503         }
 504         return 0;
 505 }
 506
 507 void
 508 output_left(enum tof type, struct process *proc,
 509             struct library_symbol *libsym)
 510 {
 511         assert(! options.summary);
 512
 513         if (current_proc) {
 514                 fprintf(options.output, " <unfinished ...>\n");
 515                 current_column = 0;
 516         }
 517         current_proc = proc;
 518         current_depth = proc->callstack_depth;
 519         begin_of_line(proc, type == LT_TOF_FUNCTION, 1);
 520         if (!options.hide_caller && libsym->lib != NULL
 521             && libsym->plt_type != LS_TOPLT_NONE)
 522                 /* We don't terribly mind failing this.  */
 523                 account_output(&current_column,
 524                                fprintf(options.output, "%s->",
 525                                        libsym->lib->soname));
 526
 527         const char *name = libsym->name;
 528 #ifdef USE_DEMANGLE
 529         if (options.demangle)
 530                 name = my_demangle(libsym->name);
 531 #endif
 532         if (account_output(&current_column,
 533                            fprintf(options.output, "%s", name)) < 0)
 534                 return;
 535
 536         if (libsym->lib != NULL
 537             && libsym->lib->type != LT_LIBTYPE_MAIN
 538             && libsym->plt_type == LS_TOPLT_NONE
 539             && account_output(&current_column,
 540                               fprintf(options.output, "@%s",
 541                                       libsym->lib->soname)) < 0)
 542                 /* We do mind failing this though.  */
 543                 return;
 544
 545         account_output(&current_column, fprintf(options.output, "("));
 546
 547         struct prototype *func = lookup_symbol_prototype(proc->leader, libsym);
 548         if (func == NULL) {
 549         fail:
 550                 account_output(&current_column, fprintf(options.output, "???"));
 551                 return;
 552         }
 553
 554         struct fetch_context *context = fetch_arg_init(type, proc,
 555                                                        func->return_info);
 556         if (context == NULL)
 557                 goto fail;
 558
 559         struct value_dict *arguments = malloc(sizeof(*arguments));
 560         if (arguments == NULL) {
 561                 fetch_arg_done(context);
 562                 goto fail;
 563         }
 564         val_dict_init(arguments);
 565
 566         ssize_t params_left = -1;
 567         int need_delim = 0;
 568         if (fetch_params(type, proc, context, arguments, func, &params_left) < 0
 569             || output_params(arguments, 0, params_left, &need_delim) < 0) {
 570                 val_dict_destroy(arguments);
 571                 fetch_arg_done(context);
 572                 arguments = NULL;
 573                 context = NULL;
 574         }
 575
 576         struct callstack_element *stel
 577                 = &proc->callstack[proc->callstack_depth - 1];
 578         stel->fetch_context = context;
 579         stel->arguments = arguments;
 580         stel->out.params_left = params_left;
 581         stel->out.need_delim = need_delim;
 582 }
 583
 584 #if defined(HAVE_LIBDW)
 585 /* Prints information about one frame of a thread.  Called by
 586    dwfl_getthread_frames in output_right.  Returns 1 when done (max
 587    number of frames reached).  Returns -1 on error.  Returns 0 on
 588    success (if there are more frames in the thread, call us again).  */
 589 static int
 590 frame_callback (Dwfl_Frame *state, void *arg)
 591 {
 592         Dwarf_Addr pc;
 593         bool isactivation;
 594
 595         int *frames = (int *) arg;
 596
 597         if (!dwfl_frame_pc(state, &pc, &isactivation))
 598                 return -1;
 599
 600         if (!isactivation)
 601                 pc--;
 602
 603         Dwfl *dwfl = dwfl_thread_dwfl(dwfl_frame_thread(state));
 604         Dwfl_Module *mod = dwfl_addrmodule(dwfl, pc);
 605         const char *modname = NULL;
 606         const char *symname = NULL;
 607         GElf_Off off = 0;
 608         if (mod != NULL) {
 609                 GElf_Sym sym;
 610                 modname = dwfl_module_info(mod, NULL, NULL, NULL, NULL,
 611                                            NULL, NULL, NULL);
 612                 symname = dwfl_module_addrinfo(mod, pc, &off, &sym,
 613                                                NULL, NULL, NULL);
 614         }
 615
 616         /* This mimics the output produced by libunwind below.  */
 617         fprintf(options.output, " > %s(%s+0x%" PRIx64 ") [%" PRIx64 "]\n",
 618                 modname, symname, off, pc);
 619
 620         /* See if we can extract the source line too and print it on
 621            the next line if we can find it.  */
 622         if (mod != NULL) {
 623                 Dwfl_Line *l = dwfl_module_getsrc(mod, pc);
 624                 if (l != NULL) {
 625                         int line, col;
 626                         line = col = -1;
 627                         const char *src = dwfl_lineinfo(l, NULL, &line, &col,
 628                                                         NULL, NULL);
 629                         if (src != NULL) {
 630                                 fprintf(options.output, "\t%s", src);
 631                                 if (line > 0) {
 632                                         fprintf(options.output, ":%d", line);
 633                                         if (col > 0)
 634                                                 fprintf(options.output,
 635                                                         ":%d", col);
 636                                 }
 637                                 fprintf(options.output, "\n");
 638                         }
 639
 640                 }
 641         }
 642
 643         /* Max number of frames to print reached? */
 644         if ((*frames)-- == 0)
 645                 return 1;
 646
 647         return 0;
 648 }
 649 #endif /* defined(HAVE_LIBDW) */
 650
 651 void
 652 output_right(enum tof type, struct process *proc, struct library_symbol *libsym,
 653              struct timedelta *spent)
 654 {
 655         assert(! options.summary);
 656
 657         struct prototype *func = lookup_symbol_prototype(proc, libsym);
 658         if (func == NULL)
 659                 return;
 660
 661         if (current_proc != NULL
 662                     && (current_proc != proc
 663                         || current_depth != proc->callstack_depth)) {
 664                 fprintf(options.output, " <unfinished ...>\n");
 665                 current_proc = NULL;
 666         }
 667         if (current_proc != proc) {
 668                 begin_of_line(proc, type == LT_TOF_FUNCTIONR, 1);
 669 #ifdef USE_DEMANGLE
 670                 current_column +=
 671                     fprintf(options.output, "<... %s resumed> ",
 672                             options.demangle ? my_demangle(libsym->name)
 673                             : libsym->name);
 674 #else
 675                 current_column +=
 676                     fprintf(options.output, "<... %s resumed> ", libsym->name);
 677 #endif
 678         }
 679
 680         struct callstack_element *stel
 681                 = &proc->callstack[proc->callstack_depth - 1];
 682
 683         struct fetch_context *context = stel->fetch_context;
 684
 685         /* Fetch & enter into dictionary the retval first, so that
 686          * other values can use it in expressions.  */
 687         struct value retval;
 688         bool own_retval = false;
 689         if (context != NULL) {
 690                 value_init(&retval, proc, NULL, func->return_info, 0);
 691                 own_retval = true;
 692                 if (fetch_retval(context, type, proc, func->return_info,
 693                                  &retval) < 0)
 694                         value_set_type(&retval, NULL, 0);
 695                 else if (stel->arguments != NULL
 696                          && val_dict_push_named(stel->arguments, &retval,
 697                                                 "retval", 0) == 0)
 698                         own_retval = false;
 699         }
 700
 701         if (stel->arguments != NULL)
 702                 output_params(stel->arguments, stel->out.params_left,
 703                               val_dict_count(stel->arguments),
 704                               &stel->out.need_delim);
 705
 706         current_column += fprintf(options.output, ") ");
 707         tabto(options.align - 1);
 708         fprintf(options.output, "= ");
 709
 710         if (context != NULL && retval.type != NULL) {
 711                 struct format_argument_data data = { &retval, stel->arguments };
 712                 format_argument_cb(options.output, &data);
 713         }
 714
 715         if (own_retval)
 716                 value_destroy(&retval);
 717
 718         if (opt_T) {
 719                 assert(spent != NULL);
 720                 fprintf(options.output, " <%lu.%06d>",
 721                         (unsigned long) spent->tm.tv_sec,
 722                         (int) spent->tm.tv_usec);
 723         }
 724
 725         fprintf(options.output, "\n");
 726
 727 #if defined(HAVE_LIBUNWIND)
 728         if (options.bt_depth > 0
 729             && proc->unwind_priv != NULL
 730             && proc->unwind_as != NULL) {
 731                 unw_cursor_t cursor;
 732                 arch_addr_t ip, function_offset;
 733                 struct library *lib = NULL;
 734                 int unwind_depth = options.bt_depth;
 735                 char fn_name[100];
 736                 const char *lib_name;
 737                 size_t distance;
 738
 739                 /* Verify that we can safely cast arch_addr_t* to
 740                  * unw_word_t*.  */
 741                 (void)sizeof(char[1 - 2*(sizeof(unw_word_t)
 742                                         != sizeof(arch_addr_t))]);
 743                 unw_init_remote(&cursor, proc->unwind_as, proc->unwind_priv);
 744                 while (unwind_depth) {
 745
 746                         int rc = unw_get_reg(&cursor, UNW_REG_IP,
 747                                              (unw_word_t *) &ip);
 748                         if (rc < 0) {
 749                                 fprintf(options.output, " > Error: %s\n",
 750                                         unw_strerror(rc));
 751                                 goto cont;
 752                         }
 753
 754                         /* We are looking for the library with the base address
 755                          * closest to the current ip.  */
 756                         lib_name = "unmapped_area";
 757                         distance = (size_t) -1;
 758                         lib = proc->libraries;
 759                         while (lib != NULL) {
 760                                 /* N.B.: Assumes sizeof(size_t) ==
 761                                  * sizeof(arch_addr_t).
 762                                  * Keyword: double cast.  */
 763                                 if ((ip >= lib->base) &&
 764                                             ((size_t)(ip - lib->base)
 765                                             < distance)) {
 766                                         distance = ip - lib->base;
 767                                         lib_name = lib->pathname;
 768                                 }
 769                                 lib = lib->next;
 770                         }
 771
 772                         rc = unw_get_proc_name(&cursor, fn_name,
 773                                                sizeof(fn_name),
 774                                                (unw_word_t *) &function_offset);
 775                         if (rc == 0 || rc == -UNW_ENOMEM)
 776                                 fprintf(options.output, " > %s(%s+%p) [%p]\n",
 777                                         lib_name, fn_name, function_offset, ip);
 778                         else
 779                                 fprintf(options.output, " > %s(??\?) [%p]\n",
 780                                         lib_name, ip);
 781
 782                 cont:
 783                         if (unw_step(&cursor) <= 0)
 784                                 break;
 785                         unwind_depth--;
 786                 }
 787                 fprintf(options.output, "\n");
 788         }
 789 #endif /* defined(HAVE_LIBUNWIND) */
 790
 791 #if defined(HAVE_LIBDW)
 792         if (options.bt_depth > 0 && proc->leader->dwfl != NULL) {
 793                 int frames = options.bt_depth;
 794                 if (dwfl_getthread_frames(proc->leader->dwfl, proc->pid,
 795                                           frame_callback, &frames) < 0) {
 796                         // Only print an error if we couldn't show anything.
 797                         // Otherwise just show there might be more...
 798                         if (frames == options.bt_depth)
 799                                 fprintf(stderr,
 800                                         "dwfl_getthread_frames tid %d: %s\n",
 801                                         proc->pid, dwfl_errmsg(-1));
 802                         else
 803                                 fprintf(options.output, " > [...]\n");
 804                 }
 805                 fprintf(options.output, "\n");
 806           }
 807 #endif /* defined(HAVE_LIBDW) */
 808
 809         current_proc = NULL;
 810         current_column = 0;
 811 }
 812
 813 int
 814 delim_output(FILE *stream, int *need_delimp,
 815              int (*writer)(FILE *stream, void *data),
 816              void *data)
 817 {
 818         int o;
 819
 820         /* If we don't need a delimiter, then we don't need to go
 821          * through a temporary stream.  It's all the same whether
 822          * WRITER emits anything or not.  */
 823         if (!*need_delimp) {
 824                 o = writer(stream, data);
 825
 826         } else {
 827                 struct memstream ms;
 828                 if (memstream_init(&ms) < 0)
 829                         return -1;
 830                 o = writer(ms.stream, data);
 831                 if (memstream_close(&ms) < 0)
 832                         o = -1;
 833                 if (o > 0 && ((*need_delimp
 834                                && account_output(&o, fprintf(stream, ", ")) < 0)
 835                               || fwrite(ms.buf, 1, ms.size, stream) != ms.size))
 836                         o = -1;
 837
 838                 memstream_destroy(&ms);
 839         }
 840
 841         if (o < 0)
 842                 return -1;
 843
 844         *need_delimp = *need_delimp || o > 0;
 845         return o;
 846 }
 847
 848 int
 849 account_output(int *countp, int c)
 850 {
 851         if (c > 0)
 852                 *countp += c;
 853         return c;
 854 }
 855
 856 static void
 857 do_report(const char *filename, unsigned line_no, const char *severity,
 858           const char *fmt, va_list args)
 859 {
 860         char buf[128];
 861         vsnprintf(buf, sizeof(buf), fmt, args);
 862         buf[sizeof(buf) - 1] = 0;
 863         if (filename != NULL)
 864                 output_line(0, "%s:%d: %s: %s",
 865                             filename, line_no, severity, buf);
 866         else
 867                 output_line(0, "%s: %s", severity, buf);
 868 }
 869
 870 void
 871 report_error(const char *filename, unsigned line_no, const char *fmt, ...)
 872 {
 873         va_list args;
 874         va_start(args, fmt);
 875         do_report(filename, line_no, "error", fmt, args);
 876         va_end(args);
 877 }
 878
 879 void
 880 report_warning(const char *filename, unsigned line_no, const char *fmt, ...)
 881 {
 882         va_list args;
 883         va_start(args, fmt);
 884         do_report(filename, line_no, "warning", fmt, args);
 885         va_end(args);
 886 }
 887
 888 void
 889 report_global_error(const char *fmt, ...)
 890 {
 891         va_list args;
 892         va_start(args, fmt);
 893         do_report(NULL, 0, "error", fmt, args);
 894         va_end(args);
 895 }