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 #include "debug.h"
  54
  55 #if defined(HAVE_LIBDW)
  56 #include "dwarf_prototypes.h"
  57 #endif
  58
  59 static struct process *current_proc = NULL;
  60 static size_t current_depth = 0;
  61 static int current_column = 0;
  62
  63 static void
  64 output_indent(struct process *proc)
  65 {
  66         int d = options.indent * (proc->callstack_depth - 1);
  67         current_column += fprintf(options.output, "%*s", d, "");
  68 }
  69
  70 static void
  71 begin_of_line(struct process *proc, int is_func, int indent)
  72 {
  73         current_column = 0;
  74         if (!proc) {
  75                 return;
  76         }
  77         if ((options.output != stderr) && (opt_p || options.follow)) {
  78                 current_column += fprintf(options.output, "%u ", proc->pid);
  79         } else if (options.follow) {
  80                 current_column += fprintf(options.output, "[pid %u] ", proc->pid);
  81         }
  82         if (opt_r) {
  83                 struct timeval tv;
  84                 static struct timeval old_tv = { 0, 0 };
  85                 struct timeval diff;
  86
  87                 gettimeofday(&tv, NULL);
  88
  89                 if (old_tv.tv_sec == 0 && old_tv.tv_usec == 0) {
  90                         old_tv.tv_sec = tv.tv_sec;
  91                         old_tv.tv_usec = tv.tv_usec;
  92                 }
  93                 diff.tv_sec = tv.tv_sec - old_tv.tv_sec;
  94                 if (tv.tv_usec >= old_tv.tv_usec) {
  95                         diff.tv_usec = tv.tv_usec - old_tv.tv_usec;
  96                 } else {
  97                         diff.tv_sec--;
  98                         diff.tv_usec = 1000000 + tv.tv_usec - old_tv.tv_usec;
  99                 }
 100                 old_tv.tv_sec = tv.tv_sec;
 101                 old_tv.tv_usec = tv.tv_usec;
 102                 current_column += fprintf(options.output, "%3lu.%06d ",
 103                                           (unsigned long)diff.tv_sec,
 104                                           (int)diff.tv_usec);
 105         }
 106         if (opt_t) {
 107                 struct timeval tv;
 108                 gettimeofday(&tv, NULL);
 109                 if (opt_t > 2) {
 110                         current_column += fprintf(options.output, "%lu.%06d ",
 111                                                   (unsigned long)tv.tv_sec,
 112                                                   (int)tv.tv_usec);
 113                 } else if (opt_t > 1) {
 114                         struct tm *tmp = localtime(&tv.tv_sec);
 115                         current_column +=
 116                             fprintf(options.output, "%02d:%02d:%02d.%06d ",
 117                                     tmp->tm_hour, tmp->tm_min, tmp->tm_sec,
 118                                     (int)tv.tv_usec);
 119                 } else {
 120                         struct tm *tmp = localtime(&tv.tv_sec);
 121                         current_column += fprintf(options.output, "%02d:%02d:%02d ",
 122                                                   tmp->tm_hour, tmp->tm_min,
 123                                                   tmp->tm_sec);
 124                 }
 125         }
 126         if (opt_i) {
 127                 if (is_func) {
 128                         struct callstack_element *stel
 129                                 = &proc->callstack[proc->callstack_depth - 1];
 130                         current_column += fprintf(options.output, "[%p] ",
 131                                                   stel->return_addr);
 132                 } else {
 133                         current_column += fprintf(options.output, "[%p] ",
 134                                                   proc->instruction_pointer);
 135                 }
 136         }
 137         if (options.indent > 0 && indent) {
 138                 output_indent(proc);
 139         }
 140 }
 141
 142 static struct arg_type_info *
 143 get_unknown_type(void)
 144 {
 145         static struct arg_type_info *ret = NULL;
 146         if (ret != NULL)
 147                 return ret;
 148
 149         static struct arg_type_info info;
 150         info = *type_get_simple(ARGTYPE_LONG);
 151         info.lens = &guess_lens;
 152         ret = &info;
 153         return ret;
 154 }
 155
 156 /* The default prototype is: long X(long, long, long, long).  */
 157 static struct prototype *
 158 build_default_prototype(void)
 159 {
 160         static struct prototype *ret = NULL;
 161         if (ret != NULL)
 162                 return ret;
 163
 164         static struct prototype proto;
 165         prototype_init(&proto);
 166
 167         struct arg_type_info *unknown_type = get_unknown_type();
 168         assert(unknown_type != NULL);
 169         proto.return_info = unknown_type;
 170         proto.own_return_info = 0;
 171
 172         struct param unknown_param;
 173         param_init_type(&unknown_param, unknown_type, 0);
 174
 175         size_t i;
 176         for (i = 0; i < 4; ++i)
 177                 if (prototype_push_param(&proto, &unknown_param) < 0) {
 178                         report_global_error("build_default_prototype: %s",
 179                                             strerror(errno));
 180                         prototype_destroy(&proto);
 181                         return NULL;
 182                 }
 183
 184         ret = &proto;
 185         return ret;
 186 }
 187
 188 static bool
 189 snip_period(char *buf)
 190 {
 191         char *period = strrchr(buf, '.');
 192         if (period != NULL && strcmp(period, ".so") != 0) {
 193                 *period = 0;
 194                 return true;
 195         } else {
 196                 return false;
 197         }
 198 }
 199
 200 static struct prototype *
 201 library_get_prototype(struct library *lib, const char *name)
 202 {
 203         if (lib->protolib == NULL) {
 204                 size_t sz = strlen(lib->soname);
 205                 char buf[sz + 1];
 206                 memcpy(buf, lib->soname, sz + 1);
 207
 208                 do {
 209                         if (protolib_cache_maybe_load(&g_protocache, buf, 0,
 210                                                       true, &lib->protolib) < 0)
 211                                 return NULL;
 212                 } while (lib->protolib == NULL
 213                          && lib->type == LT_LIBTYPE_DSO
 214                          && snip_period(buf));
 215
 216 #if defined(HAVE_LIBDW)
 217                 // DWARF data fills in the gaps in the .conf files, so I don't
 218                 // check for lib->protolib==NULL here
 219                 if (lib->dwfl != NULL &&
 220                     (filter_matches_library(options.plt_filter,    lib ) ||
 221                      filter_matches_library(options.static_filter, lib ) ||
 222                      filter_matches_library(options.export_filter, lib )))
 223                         import_DWARF_prototypes(lib);
 224                 else
 225                         debug(DEBUG_FUNCTION,
 226                               "Filter didn't match prototype '%s' in lib '%s'. "
 227                               "Not importing",
 228                               name, lib->soname);
 229 #endif
 230
 231                 if (lib->protolib == NULL)
 232                         lib->protolib = protolib_cache_default(&g_protocache,
 233                                                                buf, 0);
 234         }
 235         if (lib->protolib == NULL)
 236                 return NULL;
 237
 238         return protolib_lookup_prototype(lib->protolib, name,
 239                                          lib->type != LT_LIBTYPE_SYSCALL);
 240 }
 241
 242 struct find_proto_data {
 243         const char *name;
 244         struct prototype *ret;
 245 };
 246
 247 static enum callback_status
 248 find_proto_cb(struct process *proc, struct library *lib, void *d)
 249 {
 250         struct find_proto_data *data = d;
 251         data->ret = library_get_prototype(lib, data->name);
 252         return CBS_STOP_IF(data->ret != NULL);
 253 }
 254
 255 static struct prototype *
 256 lookup_symbol_prototype(struct process *proc, struct library_symbol *libsym)
 257 {
 258         if (libsym->proto != NULL)
 259                 return libsym->proto;
 260
 261         struct library *lib = libsym->lib;
 262         if (lib != NULL) {
 263                 struct find_proto_data data = { libsym->name };
 264                 data.ret = library_get_prototype(lib, libsym->name);
 265                 if (data.ret == NULL
 266                     && libsym->plt_type == LS_TOPLT_EXEC)
 267                         proc_each_library(proc, NULL, find_proto_cb, &data);
 268                 if (data.ret != NULL)
 269                         return data.ret;
 270         }
 271
 272         return build_default_prototype();
 273 }
 274
 275 void
 276 output_line(struct process *proc, const char *fmt, ...)
 277 {
 278         if (options.summary)
 279                 return;
 280
 281         if (current_proc != NULL) {
 282                 if (current_proc->callstack[current_depth].return_addr)
 283                         fprintf(options.output, " <unfinished ...>\n");
 284                 else
 285                         fprintf(options.output, " <no return ...>\n");
 286         }
 287         current_proc = NULL;
 288         if (fmt == NULL)
 289                 return;
 290
 291         begin_of_line(proc, 0, 0);
 292
 293         va_list args;
 294         va_start(args, fmt);
 295         vfprintf(options.output, fmt, args);
 296         fprintf(options.output, "\n");
 297         va_end(args);
 298
 299         current_column = 0;
 300 }
 301
 302 static void
 303 tabto(int col) {
 304         if (current_column < col) {
 305                 fprintf(options.output, "%*s", col - current_column, "");
 306         }
 307 }
 308
 309 static int
 310 output_error(FILE *stream)
 311 {
 312         return fprintf(stream, "?");
 313 }
 314
 315 static int
 316 fetch_simple_param(enum tof type, struct process *proc,
 317                    struct fetch_context *context,
 318                    struct value_dict *arguments,
 319                    struct arg_type_info *info, int own,
 320                    struct value *valuep)
 321 {
 322         /* Arrays decay into pointers per C standard.  We check for
 323          * this here, because here we also capture arrays that come
 324          * from parameter packs.  */
 325         if (info->type == ARGTYPE_ARRAY) {
 326                 struct arg_type_info *tmp = malloc(sizeof(*tmp));
 327                 if (tmp != NULL) {
 328                         type_init_pointer(tmp, info, own);
 329                         tmp->lens = info->lens;
 330                         info = tmp;
 331                         own = 1;
 332                 }
 333         }
 334
 335         struct value value;
 336         value_init(&value, proc, NULL, info, own);
 337         if (fetch_arg_next(context, type, proc, info, &value) < 0)
 338                 return -1;
 339
 340         if (val_dict_push_next(arguments, &value) < 0) {
 341                 value_destroy(&value);
 342                 return -1;
 343         }
 344
 345         if (valuep != NULL)
 346                 *valuep = value;
 347
 348         return 0;
 349 }
 350
 351 static void
 352 fetch_param_stop(struct value_dict *arguments, ssize_t *params_leftp)
 353 {
 354         if (*params_leftp == -1)
 355                 *params_leftp = val_dict_count(arguments);
 356 }
 357
 358 static int
 359 fetch_param_pack(enum tof type, struct process *proc,
 360                  struct fetch_context *context,
 361                  struct value_dict *arguments, struct param *param,
 362                  ssize_t *params_leftp)
 363 {
 364         struct param_enum *e = param_pack_init(param, arguments);
 365         if (e == NULL)
 366                 return -1;
 367
 368         int ret = 0;
 369         while (1) {
 370                 int insert_stop = 0;
 371                 struct arg_type_info *info = malloc(sizeof(*info));
 372                 if (info == NULL
 373                     || param_pack_next(param, e, info, &insert_stop) < 0) {
 374                 fail:
 375                         free(info);
 376                         ret = -1;
 377                         break;
 378                 }
 379
 380                 if (insert_stop)
 381                         fetch_param_stop(arguments, params_leftp);
 382
 383                 if (info->type == ARGTYPE_VOID) {
 384                         type_destroy(info);
 385                         free(info);
 386                         break;
 387                 }
 388
 389                 struct value val;
 390                 if (fetch_simple_param(type, proc, context, arguments,
 391                                        info, 1, &val) < 0)
 392                         goto fail;
 393
 394                 int stop = 0;
 395                 switch (param_pack_stop(param, e, &val)) {
 396                 case PPCB_ERR:
 397                         goto fail;
 398                 case PPCB_STOP:
 399                         stop = 1;
 400                 case PPCB_CONT:
 401                         break;
 402                 }
 403
 404                 if (stop)
 405                         break;
 406         }
 407
 408         param_pack_done(param, e);
 409         return ret;
 410 }
 411
 412 static int
 413 fetch_one_param(enum tof type, struct process *proc,
 414                 struct fetch_context *context,
 415                 struct value_dict *arguments, struct param *param,
 416                 ssize_t *params_leftp)
 417 {
 418         switch (param->flavor) {
 419                 int rc;
 420         case PARAM_FLAVOR_TYPE:
 421                 return fetch_simple_param(type, proc, context, arguments,
 422                                           param->u.type.type, 0, NULL);
 423
 424         case PARAM_FLAVOR_PACK:
 425                 if (fetch_param_pack_start(context,
 426                                            param->u.pack.ppflavor) < 0)
 427                         return -1;
 428                 rc = fetch_param_pack(type, proc, context, arguments,
 429                                       param, params_leftp);
 430                 fetch_param_pack_end(context);
 431                 return rc;
 432
 433         case PARAM_FLAVOR_STOP:
 434                 fetch_param_stop(arguments, params_leftp);
 435                 return 0;
 436         }
 437
 438         assert(!"Invalid param flavor!");
 439         abort();
 440 }
 441
 442 struct fetch_one_param_data
 443 {
 444         struct process *proc;
 445         struct fetch_context *context;
 446         struct value_dict *arguments;
 447         ssize_t *params_leftp;
 448         enum tof tof;
 449 };
 450
 451 static enum callback_status
 452 fetch_one_param_cb(struct prototype *proto, struct param *param, void *data)
 453 {
 454         struct fetch_one_param_data *cb_data = data;
 455         return CBS_STOP_IF(fetch_one_param(cb_data->tof, cb_data->proc,
 456                                            cb_data->context,
 457                                            cb_data->arguments, param,
 458                                            cb_data->params_leftp) < 0);
 459 }
 460
 461 static int
 462 fetch_params(enum tof type, struct process *proc,
 463              struct fetch_context *context,
 464              struct value_dict *arguments, struct prototype *func,
 465              ssize_t *params_leftp)
 466 {
 467         struct fetch_one_param_data cb_data
 468                 = { proc, context, arguments, params_leftp, type };
 469         if (prototype_each_param(func, NULL,
 470                                  &fetch_one_param_cb, &cb_data) != NULL)
 471                 return -1;
 472
 473         /* Implicit stop at the end of parameter list.  */
 474         fetch_param_stop(arguments, params_leftp);
 475
 476         return 0;
 477 }
 478
 479 struct format_argument_data
 480 {
 481         struct value *value;
 482         struct value_dict *arguments;
 483 };
 484
 485 static int
 486 format_argument_cb(FILE *stream, void *ptr)
 487 {
 488         struct format_argument_data *data = ptr;
 489         int o = format_argument(stream, data->value, data->arguments);
 490         if (o < 0)
 491                 o = output_error(stream);
 492         return o;
 493 }
 494
 495 static int
 496 output_params(struct value_dict *arguments, size_t start, size_t end,
 497               int *need_delimp)
 498 {
 499         size_t i;
 500         for (i = start; i < end; ++i) {
 501                 struct value *value = val_dict_get_num(arguments, i);
 502                 if (value == NULL)
 503                         return -1;
 504
 505                 struct format_argument_data data = { value, arguments };
 506                 int o = delim_output(options.output, need_delimp,
 507                                      format_argument_cb, &data);
 508                 if (o < 0)
 509                         return -1;
 510                 current_column += o;
 511         }
 512         return 0;
 513 }
 514
 515 void
 516 output_left(enum tof type, struct process *proc,
 517             struct library_symbol *libsym)
 518 {
 519         assert(! options.summary);
 520
 521         if (current_proc) {
 522                 fprintf(options.output, " <unfinished ...>\n");
 523                 current_column = 0;
 524         }
 525         current_proc = proc;
 526         current_depth = proc->callstack_depth;
 527         begin_of_line(proc, type == LT_TOF_FUNCTION, 1);
 528         if (!options.hide_caller && libsym->lib != NULL
 529             && libsym->plt_type != LS_TOPLT_NONE)
 530                 /* We don't terribly mind failing this.  */
 531                 account_output(&current_column,
 532                                fprintf(options.output, "%s->",
 533                                        libsym->lib->soname));
 534
 535         const char *name = libsym->name;
 536 #ifdef USE_DEMANGLE
 537         if (options.demangle)
 538                 name = my_demangle(libsym->name);
 539 #endif
 540         if (account_output(&current_column,
 541                            fprintf(options.output, "%s", name)) < 0)
 542                 return;
 543
 544         if (libsym->lib != NULL
 545             && libsym->lib->type != LT_LIBTYPE_MAIN
 546             && libsym->plt_type == LS_TOPLT_NONE
 547             && account_output(&current_column,
 548                               fprintf(options.output, "@%s",
 549                                       libsym->lib->soname)) < 0)
 550                 /* We do mind failing this though.  */
 551                 return;
 552
 553         account_output(&current_column, fprintf(options.output, "("));
 554
 555         struct prototype *func = lookup_symbol_prototype(proc->leader, libsym);
 556         if (func == NULL) {
 557         fail:
 558                 account_output(&current_column, fprintf(options.output, "???"));
 559                 return;
 560         }
 561
 562         struct fetch_context *context = fetch_arg_init(type, proc,
 563                                                        func->return_info);
 564         if (context == NULL)
 565                 goto fail;
 566
 567         struct value_dict *arguments = malloc(sizeof(*arguments));
 568         if (arguments == NULL) {
 569                 fetch_arg_done(context);
 570                 goto fail;
 571         }
 572         val_dict_init(arguments);
 573
 574         ssize_t params_left = -1;
 575         int need_delim = 0;
 576         if (fetch_params(type, proc, context, arguments, func, &params_left) < 0
 577             || output_params(arguments, 0, params_left, &need_delim) < 0) {
 578                 val_dict_destroy(arguments);
 579                 fetch_arg_done(context);
 580                 arguments = NULL;
 581                 context = NULL;
 582         }
 583
 584         struct callstack_element *stel
 585                 = &proc->callstack[proc->callstack_depth - 1];
 586         stel->fetch_context = context;
 587         stel->arguments = arguments;
 588         stel->out.params_left = params_left;
 589         stel->out.need_delim = need_delim;
 590 }
 591
 592 #if defined(HAVE_LIBDW)
 593 /* Prints information about one frame of a thread.  Called by
 594    dwfl_getthread_frames in output_right.  Returns 1 when done (max
 595    number of frames reached).  Returns -1 on error.  Returns 0 on
 596    success (if there are more frames in the thread, call us again).  */
 597 static int
 598 frame_callback (Dwfl_Frame *state, void *arg)
 599 {
 600         Dwarf_Addr pc;
 601         bool isactivation;
 602
 603         int *frames = (int *) arg;
 604
 605         if (!dwfl_frame_pc(state, &pc, &isactivation))
 606                 return -1;
 607
 608         if (!isactivation)
 609                 pc--;
 610
 611         Dwfl *dwfl = dwfl_thread_dwfl(dwfl_frame_thread(state));
 612         Dwfl_Module *mod = dwfl_addrmodule(dwfl, pc);
 613         const char *modname = NULL;
 614         const char *symname = NULL;
 615         GElf_Off off = 0;
 616         if (mod != NULL) {
 617                 GElf_Sym sym;
 618                 modname = dwfl_module_info(mod, NULL, NULL, NULL, NULL,
 619                                            NULL, NULL, NULL);
 620                 symname = dwfl_module_addrinfo(mod, pc, &off, &sym,
 621                                                NULL, NULL, NULL);
 622         }
 623
 624         /* This mimics the output produced by libunwind below.  */
 625         fprintf(options.output, " > %s(%s+0x%" PRIx64 ") [%" PRIx64 "]\n",
 626                 modname, symname, off, pc);
 627
 628         /* See if we can extract the source line too and print it on
 629            the next line if we can find it.  */
 630         if (mod != NULL) {
 631                 Dwfl_Line *l = dwfl_module_getsrc(mod, pc);
 632                 if (l != NULL) {
 633                         int line, col;
 634                         line = col = -1;
 635                         const char *src = dwfl_lineinfo(l, NULL, &line, &col,
 636                                                         NULL, NULL);
 637                         if (src != NULL) {
 638                                 fprintf(options.output, "\t%s", src);
 639                                 if (line > 0) {
 640                                         fprintf(options.output, ":%d", line);
 641                                         if (col > 0)
 642                                                 fprintf(options.output,
 643                                                         ":%d", col);
 644                                 }
 645                                 fprintf(options.output, "\n");
 646                         }
 647
 648                 }
 649         }
 650
 651         /* Max number of frames to print reached? */
 652         if ((*frames)-- == 0)
 653                 return 1;
 654
 655         return 0;
 656 }
 657 #endif /* defined(HAVE_LIBDW) */
 658
 659 void
 660 output_right(enum tof type, struct process *proc, struct library_symbol *libsym,
 661              struct timedelta *spent)
 662 {
 663         assert(! options.summary);
 664
 665         struct prototype *func = lookup_symbol_prototype(proc, libsym);
 666         if (func == NULL)
 667                 return;
 668
 669         if (current_proc != NULL
 670                     && (current_proc != proc
 671                         || current_depth != proc->callstack_depth)) {
 672                 fprintf(options.output, " <unfinished ...>\n");
 673                 current_proc = NULL;
 674         }
 675         if (current_proc != proc) {
 676                 begin_of_line(proc, type == LT_TOF_FUNCTIONR, 1);
 677 #ifdef USE_DEMANGLE
 678                 current_column +=
 679                     fprintf(options.output, "<... %s resumed> ",
 680                             options.demangle ? my_demangle(libsym->name)
 681                             : libsym->name);
 682 #else
 683                 current_column +=
 684                     fprintf(options.output, "<... %s resumed> ", libsym->name);
 685 #endif
 686         }
 687
 688         struct callstack_element *stel
 689                 = &proc->callstack[proc->callstack_depth - 1];
 690
 691         struct fetch_context *context = stel->fetch_context;
 692
 693         /* Fetch & enter into dictionary the retval first, so that
 694          * other values can use it in expressions.  */
 695         struct value retval;
 696         bool own_retval = false;
 697         if (context != NULL) {
 698                 value_init(&retval, proc, NULL, func->return_info, 0);
 699                 own_retval = true;
 700                 if (fetch_retval(context, type, proc, func->return_info,
 701                                  &retval) < 0)
 702                         value_set_type(&retval, NULL, 0);
 703                 else if (stel->arguments != NULL
 704                          && val_dict_push_named(stel->arguments, &retval,
 705                                                 "retval", 0) == 0)
 706                         own_retval = false;
 707         }
 708
 709         if (stel->arguments != NULL)
 710                 output_params(stel->arguments, stel->out.params_left,
 711                               val_dict_count(stel->arguments),
 712                               &stel->out.need_delim);
 713
 714         current_column += fprintf(options.output, ") ");
 715         tabto(options.align - 1);
 716         fprintf(options.output, "= ");
 717
 718         if (context != NULL && retval.type != NULL) {
 719                 struct format_argument_data data = { &retval, stel->arguments };
 720                 format_argument_cb(options.output, &data);
 721         }
 722
 723         if (own_retval)
 724                 value_destroy(&retval);
 725
 726         if (opt_T) {
 727                 assert(spent != NULL);
 728                 fprintf(options.output, " <%lu.%06d>",
 729                         (unsigned long) spent->tm.tv_sec,
 730                         (int) spent->tm.tv_usec);
 731         }
 732
 733         fprintf(options.output, "\n");
 734
 735 #if defined(HAVE_LIBUNWIND)
 736         if (options.bt_depth > 0
 737             && proc->unwind_priv != NULL
 738             && proc->unwind_as != NULL) {
 739                 unw_cursor_t cursor;
 740                 arch_addr_t ip, function_offset;
 741                 struct library *lib = NULL;
 742                 int unwind_depth = options.bt_depth;
 743                 char fn_name[100];
 744                 const char *lib_name;
 745                 size_t distance;
 746
 747                 /* Verify that we can safely cast arch_addr_t* to
 748                  * unw_word_t*.  */
 749                 (void)sizeof(char[1 - 2*(sizeof(unw_word_t)
 750                                         != sizeof(arch_addr_t))]);
 751                 unw_init_remote(&cursor, proc->unwind_as, proc->unwind_priv);
 752                 while (unwind_depth) {
 753
 754                         int rc = unw_get_reg(&cursor, UNW_REG_IP,
 755                                              (unw_word_t *) &ip);
 756                         if (rc < 0) {
 757                                 fprintf(options.output, " > Error: %s\n",
 758                                         unw_strerror(rc));
 759                                 goto cont;
 760                         }
 761
 762                         /* We are looking for the library with the base address
 763                          * closest to the current ip.  */
 764                         lib_name = "unmapped_area";
 765                         distance = (size_t) -1;
 766                         lib = proc->libraries;
 767                         while (lib != NULL) {
 768                                 /* N.B.: Assumes sizeof(size_t) ==
 769                                  * sizeof(arch_addr_t).
 770                                  * Keyword: double cast.  */
 771                                 if ((ip >= lib->base) &&
 772                                             ((size_t)(ip - lib->base)
 773                                             < distance)) {
 774                                         distance = ip - lib->base;
 775                                         lib_name = lib->pathname;
 776                                 }
 777                                 lib = lib->next;
 778                         }
 779
 780                         rc = unw_get_proc_name(&cursor, fn_name,
 781                                                sizeof(fn_name),
 782                                                (unw_word_t *) &function_offset);
 783                         if (rc == 0 || rc == -UNW_ENOMEM)
 784                                 fprintf(options.output, " > %s(%s+%p) [%p]\n",
 785                                         lib_name, fn_name, function_offset, ip);
 786                         else
 787                                 fprintf(options.output, " > %s(??\?) [%p]\n",
 788                                         lib_name, ip);
 789
 790                 cont:
 791                         if (unw_step(&cursor) <= 0)
 792                                 break;
 793                         unwind_depth--;
 794                 }
 795                 fprintf(options.output, "\n");
 796         }
 797 #endif /* defined(HAVE_LIBUNWIND) */
 798
 799 #if defined(HAVE_LIBDW)
 800         if (options.bt_depth > 0 && proc->leader->dwfl != NULL) {
 801                 int frames = options.bt_depth;
 802                 if (dwfl_getthread_frames(proc->leader->dwfl, proc->pid,
 803                                           frame_callback, &frames) < 0) {
 804                         // Only print an error if we couldn't show anything.
 805                         // Otherwise just show there might be more...
 806                         if (frames == options.bt_depth)
 807                                 fprintf(stderr,
 808                                         "dwfl_getthread_frames tid %d: %s\n",
 809                                         proc->pid, dwfl_errmsg(-1));
 810                         else
 811                                 fprintf(options.output, " > [...]\n");
 812                 }
 813                 fprintf(options.output, "\n");
 814           }
 815 #endif /* defined(HAVE_LIBDW) */
 816
 817         current_proc = NULL;
 818         current_column = 0;
 819 }
 820
 821 int
 822 delim_output(FILE *stream, int *need_delimp,
 823              int (*writer)(FILE *stream, void *data),
 824              void *data)
 825 {
 826         int o;
 827
 828         /* If we don't need a delimiter, then we don't need to go
 829          * through a temporary stream.  It's all the same whether
 830          * WRITER emits anything or not.  */
 831         if (!*need_delimp) {
 832                 o = writer(stream, data);
 833
 834         } else {
 835                 struct memstream ms;
 836                 if (memstream_init(&ms) < 0)
 837                         return -1;
 838                 o = writer(ms.stream, data);
 839                 if (memstream_close(&ms) < 0)
 840                         o = -1;
 841                 if (o > 0 && ((*need_delimp
 842                                && account_output(&o, fprintf(stream, ", ")) < 0)
 843                               || fwrite(ms.buf, 1, ms.size, stream) != ms.size))
 844                         o = -1;
 845
 846                 memstream_destroy(&ms);
 847         }
 848
 849         if (o < 0)
 850                 return -1;
 851
 852         *need_delimp = *need_delimp || o > 0;
 853         return o;
 854 }
 855
 856 int
 857 account_output(int *countp, int c)
 858 {
 859         if (c > 0)
 860                 *countp += c;
 861         return c;
 862 }
 863
 864 static void
 865 do_report(const char *filename, unsigned line_no, const char *severity,
 866           const char *fmt, va_list args)
 867 {
 868         char buf[128];
 869         vsnprintf(buf, sizeof(buf), fmt, args);
 870         buf[sizeof(buf) - 1] = 0;
 871         if (filename != NULL)
 872                 output_line(0, "%s:%d: %s: %s",
 873                             filename, line_no, severity, buf);
 874         else
 875                 output_line(0, "%s: %s", severity, buf);
 876 }
 877
 878 void
 879 report_error(const char *filename, unsigned line_no, const char *fmt, ...)
 880 {
 881         va_list args;
 882         va_start(args, fmt);
 883         do_report(filename, line_no, "error", fmt, args);
 884         va_end(args);
 885 }
 886
 887 void
 888 report_warning(const char *filename, unsigned line_no, const char *fmt, ...)
 889 {
 890         va_list args;
 891         va_start(args, fmt);
 892         do_report(filename, line_no, "warning", fmt, args);
 893         va_end(args);
 894 }
 895
 896 void
 897 report_global_error(const char *fmt, ...)
 898 {
 899         va_list args;
 900         va_start(args, fmt);
 901         do_report(NULL, 0, "error", fmt, args);
 902         va_end(args);
 903 }