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