gdb/break-catch-load.c

   1 /* Everything about load/unload catchpoints, for GDB.
   2
   3    Copyright (C) 1986-2022 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21
  22 #include "annotate.h"
  23 #include "arch-utils.h"
  24 #include "breakpoint.h"
  25 #include "cli/cli-decode.h"
  26 #include "mi/mi-common.h"
  27 #include "progspace.h"
  28 #include "solist.h"
  29 #include "target.h"
  30 #include "valprint.h"
  31
  32 /* An instance of this type is used to represent an solib catchpoint.
  33    A breakpoint is really of this type iff its ops pointer points to
  34    CATCH_SOLIB_BREAKPOINT_OPS.  */
  35
  36 struct solib_catchpoint : public catchpoint
  37 {
  38   solib_catchpoint (struct gdbarch *gdbarch, bool temp,
  39                     const char *cond_string,
  40                     bool is_load_, const char *arg)
  41     : catchpoint (gdbarch, temp, cond_string),
  42       is_load (is_load_),
  43       regex (arg == nullptr ? nullptr : make_unique_xstrdup (arg)),
  44       compiled (arg == nullptr
  45                 ? nullptr
  46                 : new compiled_regex (arg, REG_NOSUB, _("Invalid regexp")))
  47   {
  48   }
  49
  50   int insert_location (struct bp_location *) override;
  51   int remove_location (struct bp_location *,
  52                        enum remove_bp_reason reason) override;
  53   int breakpoint_hit (const struct bp_location *bl,
  54                       const address_space *aspace,
  55                       CORE_ADDR bp_addr,
  56                       const target_waitstatus &ws) override;
  57   void check_status (struct bpstat *bs) override;
  58   enum print_stop_action print_it (const bpstat *bs) const override;
  59   bool print_one (bp_location **) const override;
  60   void print_mention () const override;
  61   void print_recreate (struct ui_file *fp) const override;
  62
  63   /* True for "catch load", false for "catch unload".  */
  64   bool is_load;
  65
  66   /* Regular expression to match, if any.  COMPILED is only valid when
  67      REGEX is non-NULL.  */
  68   gdb::unique_xmalloc_ptr<char> regex;
  69   std::unique_ptr<compiled_regex> compiled;
  70 };
  71
  72 int
  73 solib_catchpoint::insert_location (struct bp_location *ignore)
  74 {
  75   return 0;
  76 }
  77
  78 int
  79 solib_catchpoint::remove_location (struct bp_location *ignore,
  80                                    enum remove_bp_reason reason)
  81 {
  82   return 0;
  83 }
  84
  85 int
  86 solib_catchpoint::breakpoint_hit (const struct bp_location *bl,
  87                                   const address_space *aspace,
  88                                   CORE_ADDR bp_addr,
  89                                   const target_waitstatus &ws)
  90 {
  91   if (ws.kind () == TARGET_WAITKIND_LOADED)
  92     return 1;
  93
  94   for (breakpoint *other : all_breakpoints ())
  95     {
  96       if (other == bl->owner)
  97         continue;
  98
  99       if (other->type != bp_shlib_event)
 100         continue;
 101
 102       if (pspace != NULL && other->pspace != pspace)
 103         continue;
 104
 105       for (bp_location *other_bl : other->locations ())
 106         {
 107           if (other->breakpoint_hit (other_bl, aspace, bp_addr, ws))
 108             return 1;
 109         }
 110     }
 111
 112   return 0;
 113 }
 114
 115 void
 116 solib_catchpoint::check_status (struct bpstat *bs)
 117 {
 118   if (is_load)
 119     {
 120       for (so_list *iter : current_program_space->added_solibs)
 121         {
 122           if (!regex
 123               || compiled->exec (iter->so_name, 0, NULL, 0) == 0)
 124             return;
 125         }
 126     }
 127   else
 128     {
 129       for (const std::string &iter : current_program_space->deleted_solibs)
 130         {
 131           if (!regex
 132               || compiled->exec (iter.c_str (), 0, NULL, 0) == 0)
 133             return;
 134         }
 135     }
 136
 137   bs->stop = 0;
 138   bs->print_it = print_it_noop;
 139 }
 140
 141 enum print_stop_action
 142 solib_catchpoint::print_it (const bpstat *bs) const
 143 {
 144   struct breakpoint *b = bs->breakpoint_at;
 145   struct ui_out *uiout = current_uiout;
 146
 147   annotate_catchpoint (b->number);
 148   maybe_print_thread_hit_breakpoint (uiout);
 149   if (b->disposition == disp_del)
 150     uiout->text ("Temporary catchpoint ");
 151   else
 152     uiout->text ("Catchpoint ");
 153   uiout->field_signed ("bkptno", b->number);
 154   uiout->text ("\n");
 155   if (uiout->is_mi_like_p ())
 156     uiout->field_string ("disp", bpdisp_text (b->disposition));
 157   print_solib_event (true);
 158   return PRINT_SRC_AND_LOC;
 159 }
 160
 161 bool
 162 solib_catchpoint::print_one (bp_location **locs) const
 163 {
 164   struct value_print_options opts;
 165   struct ui_out *uiout = current_uiout;
 166
 167   get_user_print_options (&opts);
 168   /* Field 4, the address, is omitted (which makes the columns not
 169      line up too nicely with the headers, but the effect is relatively
 170      readable).  */
 171   if (opts.addressprint)
 172     {
 173       annotate_field (4);
 174       uiout->field_skip ("addr");
 175     }
 176
 177   std::string msg;
 178   annotate_field (5);
 179   if (is_load)
 180     {
 181       if (regex)
 182         msg = string_printf (_("load of library matching %s"),
 183                              regex.get ());
 184       else
 185         msg = _("load of library");
 186     }
 187   else
 188     {
 189       if (regex)
 190         msg = string_printf (_("unload of library matching %s"),
 191                              regex.get ());
 192       else
 193         msg = _("unload of library");
 194     }
 195   uiout->field_string ("what", msg);
 196
 197   if (uiout->is_mi_like_p ())
 198     uiout->field_string ("catch-type", is_load ? "load" : "unload");
 199
 200   return true;
 201 }
 202
 203 void
 204 solib_catchpoint::print_mention () const
 205 {
 206   gdb_printf (_("Catchpoint %d (%s)"), number,
 207               is_load ? "load" : "unload");
 208 }
 209
 210 void
 211 solib_catchpoint::print_recreate (struct ui_file *fp) const
 212 {
 213   gdb_printf (fp, "%s %s",
 214               disposition == disp_del ? "tcatch" : "catch",
 215               is_load ? "load" : "unload");
 216   if (regex)
 217     gdb_printf (fp, " %s", regex.get ());
 218   gdb_printf (fp, "\n");
 219 }
 220
 221 /* See breakpoint.h.  */
 222
 223 void
 224 add_solib_catchpoint (const char *arg, bool is_load, bool is_temp, bool enabled)
 225 {
 226   struct gdbarch *gdbarch = get_current_arch ();
 227
 228   if (!arg)
 229     arg = "";
 230   arg = skip_spaces (arg);
 231   if (*arg == '\0')
 232     arg = nullptr;
 233
 234   std::unique_ptr<solib_catchpoint> c (new solib_catchpoint (gdbarch, is_temp,
 235                                                              nullptr,
 236                                                              is_load, arg));
 237
 238   c->enable_state = enabled ? bp_enabled : bp_disabled;
 239
 240   install_breakpoint (0, std::move (c), 1);
 241 }
 242
 243 /* A helper function that does all the work for "catch load" and
 244    "catch unload".  */
 245
 246 static void
 247 catch_load_or_unload (const char *arg, int from_tty, int is_load,
 248                       struct cmd_list_element *command)
 249 {
 250   const int enabled = 1;
 251   bool temp = command->context () == CATCH_TEMPORARY;
 252
 253   add_solib_catchpoint (arg, is_load, temp, enabled);
 254 }
 255
 256 static void
 257 catch_load_command_1 (const char *arg, int from_tty,
 258                       struct cmd_list_element *command)
 259 {
 260   catch_load_or_unload (arg, from_tty, 1, command);
 261 }
 262
 263 static void
 264 catch_unload_command_1 (const char *arg, int from_tty,
 265                         struct cmd_list_element *command)
 266 {
 267   catch_load_or_unload (arg, from_tty, 0, command);
 268 }
 269
 270 void _initialize_break_catch_load ();
 271 void
 272 _initialize_break_catch_load ()
 273 {
 274   add_catch_command ("load", _("Catch loads of shared libraries.\n\
 275 Usage: catch load [REGEX]\n\
 276 If REGEX is given, only stop for libraries matching the regular expression."),
 277                      catch_load_command_1,
 278                      NULL,
 279                      CATCH_PERMANENT,
 280                      CATCH_TEMPORARY);
 281   add_catch_command ("unload", _("Catch unloads of shared libraries.\n\
 282 Usage: catch unload [REGEX]\n\
 283 If REGEX is given, only stop for libraries matching the regular expression."),
 284                      catch_unload_command_1,
 285                      NULL,
 286                      CATCH_PERMANENT,
 287                      CATCH_TEMPORARY);
 288 }