gdb/skip.c

   1 /* Skipping uninteresting files and functions while stepping.
   2
   3    Copyright (C) 2011-2012 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "defs.h"
  19 #include "skip.h"
  20 #include "value.h"
  21 #include "valprint.h"
  22 #include "ui-out.h"
  23 #include "gdb_string.h"
  24 #include "symtab.h"
  25 #include "gdbcmd.h"
  26 #include "command.h"
  27 #include "completer.h"
  28 #include "stack.h"
  29 #include "cli/cli-utils.h"
  30 #include "arch-utils.h"
  31 #include "linespec.h"
  32 #include "objfiles.h"
  33 #include "exceptions.h"
  34 #include "breakpoint.h" /* for get_sal_arch () */
  35
  36 struct skiplist_entry
  37 {
  38   int number;
  39
  40   /* NULL if this isn't a skiplist entry for an entire file.
  41      The skiplist entry owns this pointer.  */
  42   char *filename;
  43
  44   /* The name of the marked-for-skip function, if this is a skiplist
  45      entry for a function.  Note that this might be non-null even if
  46      the pc is 0 if the entry is pending a shared library load.
  47
  48      The skiplist entry owns this pointer.  */
  49   char *function_name;
  50
  51   /* 0 if this is a skiplist entry for an entire file, or if this
  52      entry will be on a function, pending a shared library load.  */
  53   CORE_ADDR pc;
  54
  55   /* Architecture we used to create the skiplist entry. May be null
  56      if the entry is pending a shared library load.  */
  57   struct gdbarch *gdbarch;
  58
  59   int enabled;
  60   int pending;
  61
  62   struct skiplist_entry *next;
  63 };
  64
  65 static void skip_function_command (char *arg, int from_tty);
  66 static void skip_file_command (char *arg, int from_tty);
  67 static void skip_info (char *arg, int from_tty);
  68
  69 static void add_skiplist_entry (struct skiplist_entry *e);
  70 static void skip_function_pc (CORE_ADDR pc, const char *name,
  71                               struct gdbarch *arch,
  72                               int pending);
  73
  74 static struct skiplist_entry *skiplist_entry_chain;
  75 static int skiplist_entry_count;
  76
  77 #define ALL_SKIPLIST_ENTRIES(E) \
  78   for (E = skiplist_entry_chain; E; E = E->next)
  79
  80 #define ALL_SKIPLIST_ENTRIES_SAFE(E,TMP) \
  81   for (E = skiplist_entry_chain;         \
  82        E ? (TMP = E->next, 1) : 0;       \
  83        E = TMP)
  84
  85 static void
  86 skip_file_command (char *arg, int from_tty)
  87 {
  88   struct skiplist_entry *e;
  89   struct symtab *symtab;
  90   int pending = 0;
  91   char *filename = 0;
  92
  93   /* If no argument was given, try to default to the last
  94      displayed codepoint.  */
  95   if (arg == 0)
  96     {
  97       symtab = get_last_displayed_symtab ();
  98       if (symtab == 0)
  99         error (_("No default file now."));
 100       else
 101         filename = symtab->filename;
 102     }
 103   else
 104     {
 105       symtab = lookup_symtab (arg);
 106       if (symtab == 0)
 107         {
 108           fprintf_filtered (gdb_stderr, _("No source file named %s.\n"), arg);
 109           if (!nquery (_("\
 110 Ignore file pending future shared library load? ")))
 111             return;
 112
 113           pending = 1;
 114           filename = arg;
 115         }
 116       else
 117         filename = symtab->filename;
 118     }
 119
 120   e = XZALLOC (struct skiplist_entry);
 121   e->filename = xstrdup (filename);
 122   e->enabled = 1;
 123   e->pending = pending;
 124   if (symtab != 0)
 125     e->gdbarch = get_objfile_arch (symtab->objfile);
 126
 127   add_skiplist_entry (e);
 128
 129   printf_filtered (_("File %s will be skipped when stepping.\n"), filename);
 130 }
 131
 132 static void
 133 skip_function_command (char *arg, int from_tty)
 134 {
 135   CORE_ADDR func_pc;
 136   const char *name = NULL;
 137
 138   /* Default to the current function if no argument is given.  */
 139   if (arg == 0)
 140     {
 141       CORE_ADDR pc;
 142       if (!last_displayed_sal_is_valid ())
 143         error (_("No default function now."));
 144
 145       pc = get_last_displayed_addr ();
 146       if (!find_pc_partial_function (pc, &name, &func_pc, 0))
 147         {
 148           error (_("No function found containing current program point %s."),
 149                   paddress (get_current_arch (), pc));
 150         }
 151       skip_function_pc (func_pc, name, get_current_arch (), 0);
 152     }
 153   else
 154     {
 155       /* Decode arg.  We set funfirstline=1 so decode_line_1 will give us the
 156          first line of the function specified, if it can, and so that we'll
 157          reject variable names and the like.  */
 158
 159       int i;
 160       int pending = 0;
 161       char *orig_arg = arg; /* decode_line_1 modifies the arg pointer.  */
 162       volatile struct gdb_exception decode_exception;
 163       struct symtabs_and_lines sals = { 0 };
 164
 165       TRY_CATCH (decode_exception, RETURN_MASK_ERROR)
 166         {
 167           sals = decode_line_1 (&arg, DECODE_LINE_FUNFIRSTLINE, 0, 0);
 168         }
 169
 170       if (decode_exception.reason < 0)
 171         {
 172           if (decode_exception.error != NOT_FOUND_ERROR)
 173             throw_exception (decode_exception);
 174
 175           fprintf_filtered (gdb_stderr,
 176                             _("No function found named %s.\n"), orig_arg);
 177
 178           if (nquery (_("\
 179 Ignore function pending future shared library load? ")))
 180             {
 181               /* Add the pending skiplist entry.  */
 182               skip_function_pc (0, orig_arg, 0, 1);
 183             }
 184
 185           return;
 186         }
 187
 188       if (sals.nelts > 1)
 189         error (_("Specify just one function at a time."));
 190       if (strlen (arg) != 0)
 191         error (_("Junk at end of arguments."));
 192
 193       /* The pc decode_line_1 gives us is the first line of the function,
 194          but we actually want the line before that.  The call to
 195          find_pc_partial_function gets us the value we actually want.  */
 196       {
 197         struct symtab_and_line sal = sals.sals[0];
 198         CORE_ADDR pc = sal.pc;
 199         CORE_ADDR func_start = 0;
 200         struct gdbarch *arch = get_sal_arch (sal);
 201
 202         if (!find_pc_partial_function (pc, &name, &func_start, 0))
 203           {
 204             error (_("No function found containing program point %s."),
 205                      paddress (arch, pc));
 206           }
 207
 208         skip_function_pc (func_start, name, arch, 0);
 209       }
 210     }
 211 }
 212
 213 static void
 214 skip_info (char *arg, int from_tty)
 215 {
 216   struct skiplist_entry *e;
 217   int num_printable_entries = 0;
 218   int address_width = 10;
 219   struct value_print_options opts;
 220   struct cleanup *tbl_chain;
 221
 222   get_user_print_options (&opts);
 223
 224   /* Count the number of rows in the table and see if we need space for a
 225      64-bit address anywhere.  */
 226   ALL_SKIPLIST_ENTRIES (e)
 227     if (arg == 0 || number_is_in_list (arg, e->number))
 228       {
 229         num_printable_entries++;
 230         if (e->gdbarch && gdbarch_addr_bit (e->gdbarch) > 32)
 231           address_width = 18;
 232       }
 233
 234   if (num_printable_entries == 0)
 235     {
 236       if (arg == 0)
 237         ui_out_message (current_uiout, 0, _("\
 238 Not skipping any files or functions.\n"));
 239       else
 240         ui_out_message (current_uiout, 0,
 241                         _("No skiplist entries found with number %s.\n"), arg);
 242
 243       return;
 244     }
 245
 246   if (opts.addressprint)
 247     tbl_chain = make_cleanup_ui_out_table_begin_end (current_uiout, 5,
 248                                                      num_printable_entries,
 249                                                      "SkiplistTable");
 250   else
 251     tbl_chain
 252        = make_cleanup_ui_out_table_begin_end (current_uiout, 4,
 253                                               num_printable_entries,
 254                                               "SkiplistTable");
 255
 256   ui_out_table_header (current_uiout, 7, ui_left, "number", "Num");      /* 1 */
 257   ui_out_table_header (current_uiout, 14, ui_left, "type", "Type");      /* 2 */
 258   ui_out_table_header (current_uiout, 3, ui_left, "enabled", "Enb");     /* 3 */
 259   if (opts.addressprint)
 260     {
 261       ui_out_table_header (current_uiout, address_width, ui_left,
 262                            "addr", "Address");                           /* 4 */
 263     }
 264   ui_out_table_header (current_uiout, 40, ui_noalign, "what", "What");   /* 5 */
 265   ui_out_table_body (current_uiout);
 266
 267   ALL_SKIPLIST_ENTRIES (e)
 268     {
 269       struct cleanup *entry_chain;
 270
 271       QUIT;
 272       if (arg != 0 && !number_is_in_list (arg, e->number))
 273         continue;
 274
 275       entry_chain = make_cleanup_ui_out_tuple_begin_end (current_uiout,
 276                                                          "blklst-entry");
 277       ui_out_field_int (current_uiout, "number", e->number);             /* 1 */
 278
 279       if (e->function_name != 0)
 280         ui_out_field_string (current_uiout, "type", "function");         /* 2 */
 281       else if (e->filename != 0)
 282         ui_out_field_string (current_uiout, "type", "file");             /* 2 */
 283       else
 284         internal_error (__FILE__, __LINE__, _("\
 285 Skiplist entry should have either a filename or a function name."));
 286
 287       if (e->enabled)
 288         ui_out_field_string (current_uiout, "enabled", "y");             /* 3 */
 289       else
 290         ui_out_field_string (current_uiout, "enabled", "n");             /* 3 */
 291
 292       if (opts.addressprint)
 293         {
 294           if (e->pc != 0)
 295             ui_out_field_core_addr (current_uiout, "addr",
 296                                     e->gdbarch, e->pc);                  /* 4 */
 297           else
 298             ui_out_field_string (current_uiout, "addr", "");             /* 4 */
 299         }
 300
 301       if (!e->pending && e->function_name != 0)
 302         {
 303            struct symbol *sym;
 304
 305            gdb_assert (e->pc != 0);
 306            sym = find_pc_function (e->pc);
 307            if (sym)
 308              ui_out_field_fmt (current_uiout, "what", "%s at %s:%d",
 309                                sym->ginfo.name,
 310                                sym->symtab->filename,
 311                                sym->line);
 312            else
 313              ui_out_field_string (current_uiout, "what", "?");
 314         }
 315       else if (e->pending && e->function_name != 0)
 316         {
 317           ui_out_field_fmt (current_uiout, "what", "%s (PENDING)",
 318                             e->function_name);
 319         }
 320       else if (!e->pending && e->filename != 0)
 321         ui_out_field_string (current_uiout, "what", e->filename);
 322       else if (e->pending && e->filename != 0)
 323         ui_out_field_fmt (current_uiout, "what", "%s (PENDING)",
 324                           e->filename);
 325
 326       ui_out_text (current_uiout, "\n");
 327       do_cleanups (entry_chain);
 328     }
 329
 330   do_cleanups (tbl_chain);
 331 }
 332
 333 static void
 334 skip_enable_command (char *arg, int from_tty)
 335 {
 336   struct skiplist_entry *e;
 337   int found = 0;
 338
 339   ALL_SKIPLIST_ENTRIES (e)
 340     if (arg == 0 || number_is_in_list (arg, e->number))
 341       {
 342         e->enabled = 1;
 343         found = 1;
 344       }
 345
 346   if (!found)
 347     error (_("No skiplist entries found with number %s."), arg);
 348 }
 349
 350 static void
 351 skip_disable_command (char *arg, int from_tty)
 352 {
 353   struct skiplist_entry *e;
 354   int found = 0;
 355
 356   ALL_SKIPLIST_ENTRIES (e)
 357     if (arg == 0 || number_is_in_list (arg, e->number))
 358       {
 359         e->enabled = 0;
 360         found = 1;
 361       }
 362
 363   if (!found)
 364     error (_("No skiplist entries found with number %s."), arg);
 365 }
 366
 367 static void
 368 skip_delete_command (char *arg, int from_tty)
 369 {
 370   struct skiplist_entry *e, *temp, *b_prev;
 371   int found = 0;
 372
 373   b_prev = 0;
 374   ALL_SKIPLIST_ENTRIES_SAFE (e, temp)
 375     if (arg == 0 || number_is_in_list (arg, e->number))
 376       {
 377         if (b_prev != 0)
 378           b_prev->next = e->next;
 379         else
 380           skiplist_entry_chain = e->next;
 381
 382         xfree (e->function_name);
 383         xfree (e->filename);
 384         xfree (e);
 385         found = 1;
 386       }
 387     else
 388       {
 389         b_prev = e;
 390       }
 391
 392   if (!found)
 393     error (_("No skiplist entries found with number %s."), arg);
 394 }
 395
 396 /* Create a skiplist entry for the given pc corresponding to the given
 397    function name and add it to the list.  */
 398
 399 static void
 400 skip_function_pc (CORE_ADDR pc, const char *name, struct gdbarch *arch,
 401                   int pending)
 402 {
 403   struct skiplist_entry *e = XZALLOC (struct skiplist_entry);
 404
 405   e->pc = pc;
 406   e->gdbarch = arch;
 407   e->enabled = 1;
 408   e->pending = pending;
 409   e->function_name = xstrdup (name);
 410
 411   add_skiplist_entry (e);
 412
 413   if (!pending)
 414     printf_filtered (_("Function %s at %s will be skipped when stepping.\n"),
 415                      name, paddress (get_current_arch (), pc));
 416   else
 417     printf_filtered (_("Function %s will be skipped when stepping, "
 418                        "pending shared library load.\n"),
 419                      name);
 420 }
 421
 422 /* Add the given skiplist entry to our list, and set the entry's number.  */
 423
 424 static void
 425 add_skiplist_entry (struct skiplist_entry *e)
 426 {
 427   struct skiplist_entry *e1;
 428
 429   e->number = ++skiplist_entry_count;
 430
 431   /* Add to the end of the chain so that the list of
 432      skiplist entries will be in numerical order.  */
 433
 434   e1 = skiplist_entry_chain;
 435   if (e1 == 0)
 436     skiplist_entry_chain = e;
 437   else
 438     {
 439       while (e1->next)
 440         e1 = e1->next;
 441       e1->next = e;
 442     }
 443 }
 444
 445 /* Does the given pc correspond to the beginning of a skipped function? */
 446
 447 int
 448 function_pc_is_marked_for_skip (CORE_ADDR pc)
 449 {
 450   int searched_for_sal = 0;
 451   struct symtab_and_line sal;
 452   char *filename = NULL;
 453   struct skiplist_entry *e;
 454
 455   ALL_SKIPLIST_ENTRIES (e)
 456     {
 457       if (!e->enabled || e->pending)
 458         continue;
 459
 460       /* Does the pc we're stepping into match e's stored pc? */
 461       if (e->pc != 0 && pc == e->pc)
 462         return 1;
 463
 464       if (e->filename != 0)
 465         {
 466           /* Get the filename corresponding to this pc, if we haven't
 467            * yet.  */
 468           if (!searched_for_sal)
 469             {
 470               sal = find_pc_line (pc, 0);
 471               if (sal.symtab != 0)
 472                 filename = sal.symtab->filename;
 473               searched_for_sal = 1;
 474             }
 475           if (filename != 0 && strcmp (filename, e->filename) == 0)
 476             return 1;
 477         }
 478     }
 479
 480   return 0;
 481 }
 482
 483 /* Re-set the skip list after symbols have been re-loaded.  */
 484 void
 485 skip_re_set (void)
 486 {
 487   struct skiplist_entry *e;
 488
 489   ALL_SKIPLIST_ENTRIES (e)
 490     {
 491       if (e->filename != 0)
 492         {
 493           /* If it's an entry telling us to skip a file, but the entry is
 494              currently pending a solib load, let's see if we now know
 495              about the file.  */
 496           struct symtab *symtab = lookup_symtab (e->filename);
 497           if (symtab != 0)
 498             {
 499               xfree (e->filename);
 500               e->filename = xstrdup (symtab->filename);
 501               e->gdbarch = get_objfile_arch (symtab->objfile);
 502               e->pending = 0;
 503             }
 504           else
 505             {
 506               e->pending = 1;
 507             }
 508         }
 509       else if (e->function_name != 0)
 510         {
 511           char *func_name = e->function_name;
 512           struct symtabs_and_lines sals = { 0 };
 513           volatile struct gdb_exception decode_exception;
 514
 515           TRY_CATCH (decode_exception, RETURN_MASK_ERROR)
 516             {
 517               sals = decode_line_1 (&func_name, DECODE_LINE_FUNFIRSTLINE, 0, 0);
 518             }
 519
 520           if (decode_exception.reason >= 0
 521               && sals.nelts == 1 && strlen (func_name) == 0)
 522             {
 523               struct symtab_and_line sal = sals.sals[0];
 524               CORE_ADDR pc = sal.pc;
 525               CORE_ADDR func_start = 0;
 526               struct gdbarch *arch = get_sal_arch (sal);
 527               const char *func_name;
 528
 529               if (find_pc_partial_function (pc, &func_name, &func_start, 0))
 530                 {
 531                   e->pending = 0;
 532                   e->function_name = xstrdup (func_name);
 533                   e->pc = func_start;
 534                   e->gdbarch = arch;
 535                 }
 536             }
 537           else
 538             {
 539               e->pending = 1;
 540             }
 541         }
 542     }
 543 }
 544
 545 void
 546 _initialize_step_skip (void)
 547 {
 548   struct cmd_list_element *c;
 549
 550   skiplist_entry_chain = 0;
 551   skiplist_entry_count = 0;
 552
 553   add_prefix_cmd ("skip", class_breakpoint, skip_function_command, _("\
 554 Ignore a function while stepping.\n\
 555 Usage: skip [FUNCTION NAME]\n\
 556 If no function name is given, ignore the current function."),
 557                   &skiplist, "skip ", 1, &cmdlist);
 558
 559   c = add_cmd ("file", class_breakpoint, skip_file_command, _("\
 560 Ignore a file while stepping.\n\
 561 Usage: skip file [FILENAME]\n\
 562 If no filename is given, ignore the current file."),
 563                &skiplist);
 564   set_cmd_completer (c, filename_completer);
 565
 566   c = add_cmd ("function", class_breakpoint, skip_function_command, _("\
 567 Ignore a function while stepping.\n\
 568 Usage: skip function [FUNCTION NAME]\n\
 569 If no function name is given, skip the current function."),
 570                &skiplist);
 571   set_cmd_completer (c, location_completer);
 572
 573   add_cmd ("enable", class_breakpoint, skip_enable_command, _("\
 574 Enable skip entries.  You can specify numbers (e.g. \"skip enable 1 3\"), \
 575 ranges (e.g. \"skip enable 4-8\"), or both (e.g. \"skip enable 1 3 4-8\").\n\n\
 576 If you don't specify any numbers or ranges, we'll enable all skip entries.\n\n\
 577 Usage: skip enable [NUMBERS AND/OR RANGES]"),
 578            &skiplist);
 579
 580   add_cmd ("disable", class_breakpoint, skip_disable_command, _("\
 581 Disable skip entries.  You can specify numbers (e.g. \"skip disable 1 3\"), \
 582 ranges (e.g. \"skip disable 4-8\"), or both (e.g. \"skip disable 1 3 4-8\").\n\n\
 583 If you don't specify any numbers or ranges, we'll disable all skip entries.\n\n\
 584 Usage: skip disable [NUMBERS AND/OR RANGES]"),
 585            &skiplist);
 586
 587   add_cmd ("delete", class_breakpoint, skip_delete_command, _("\
 588 Delete skip entries.  You can specify numbers (e.g. \"skip delete 1 3\"), \
 589 ranges (e.g. \"skip delete 4-8\"), or both (e.g. \"skip delete 1 3 4-8\").\n\n\
 590 If you don't specify any numbers or ranges, we'll delete all skip entries.\n\n\
 591 Usage: skip delete [NUMBERS AND/OR RANGES]"),
 592            &skiplist);
 593
 594   add_info ("skip", skip_info, _("\
 595 Display the status of skips.  You can specify numbers (e.g. \"skip info 1 3\"), \
 596 ranges (e.g. \"skip info 4-8\"), or both (e.g. \"skip info 1 3 4-8\").\n\n\
 597 If you don't specify any numbers or ranges, we'll show all skips.\n\n\
 598 Usage: skip info [NUMBERS AND/OR RANGES]\n\
 599 The \"Type\" column indicates one of:\n\
 600 \tfile        - ignored file\n\
 601 \tfunction    - ignored function"));
 602 }