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/* Everything about load/unload catchpoints, for GDB.
Copyright (C) 1986-2023 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "annotate.h"
#include "arch-utils.h"
#include "breakpoint.h"
#include "cli/cli-decode.h"
#include "mi/mi-common.h"
#include "progspace.h"
#include "solist.h"
#include "target.h"
#include "valprint.h"
/* An instance of this type is used to represent an solib catchpoint.
A breakpoint is really of this type iff its ops pointer points to
CATCH_SOLIB_BREAKPOINT_OPS. */
struct solib_catchpoint : public catchpoint
{
solib_catchpoint (struct gdbarch *gdbarch, bool temp,
const char *cond_string,
bool is_load_, const char *arg)
: catchpoint (gdbarch, temp, cond_string),
is_load (is_load_),
regex (arg == nullptr ? nullptr : make_unique_xstrdup (arg)),
compiled (arg == nullptr
? nullptr
: new compiled_regex (arg, REG_NOSUB, _("Invalid regexp")))
{
}
int insert_location (struct bp_location *) override;
int remove_location (struct bp_location *,
enum remove_bp_reason reason) override;
int breakpoint_hit (const struct bp_location *bl,
const address_space *aspace,
CORE_ADDR bp_addr,
const target_waitstatus &ws) override;
void check_status (struct bpstat *bs) override;
enum print_stop_action print_it (const bpstat *bs) const override;
bool print_one (const bp_location **) const override;
void print_mention () const override;
void print_recreate (struct ui_file *fp) const override;
/* True for "catch load", false for "catch unload". */
bool is_load;
/* Regular expression to match, if any. COMPILED is only valid when
REGEX is non-NULL. */
gdb::unique_xmalloc_ptr<char> regex;
std::unique_ptr<compiled_regex> compiled;
};
int
solib_catchpoint::insert_location (struct bp_location *ignore)
{
return 0;
}
int
solib_catchpoint::remove_location (struct bp_location *ignore,
enum remove_bp_reason reason)
{
return 0;
}
int
solib_catchpoint::breakpoint_hit (const struct bp_location *bl,
const address_space *aspace,
CORE_ADDR bp_addr,
const target_waitstatus &ws)
{
if (ws.kind () == TARGET_WAITKIND_LOADED)
return 1;
for (breakpoint &other : all_breakpoints ())
{
if (&other == bl->owner)
continue;
if (other.type != bp_shlib_event)
continue;
if (pspace != NULL && other.pspace != pspace)
continue;
for (bp_location &other_bl : other.locations ())
{
if (other.breakpoint_hit (&other_bl, aspace, bp_addr, ws))
return 1;
}
}
return 0;
}
void
solib_catchpoint::check_status (struct bpstat *bs)
{
if (is_load)
{
for (shobj *iter : current_program_space->added_solibs)
{
if (!regex
|| compiled->exec (iter->so_name.c_str (), 0, nullptr, 0) == 0)
return;
}
}
else
{
for (const std::string &iter : current_program_space->deleted_solibs)
{
if (!regex
|| compiled->exec (iter.c_str (), 0, NULL, 0) == 0)
return;
}
}
bs->stop = false;
bs->print_it = print_it_noop;
}
enum print_stop_action
solib_catchpoint::print_it (const bpstat *bs) const
{
struct ui_out *uiout = current_uiout;
annotate_catchpoint (this->number);
maybe_print_thread_hit_breakpoint (uiout);
if (this->disposition == disp_del)
uiout->text ("Temporary catchpoint ");
else
uiout->text ("Catchpoint ");
uiout->field_signed ("bkptno", this->number);
uiout->text ("\n");
if (uiout->is_mi_like_p ())
uiout->field_string ("disp", bpdisp_text (this->disposition));
print_solib_event (true);
return PRINT_SRC_AND_LOC;
}
bool
solib_catchpoint::print_one (const bp_location **locs) const
{
struct value_print_options opts;
struct ui_out *uiout = current_uiout;
get_user_print_options (&opts);
/* Field 4, the address, is omitted (which makes the columns not
line up too nicely with the headers, but the effect is relatively
readable). */
if (opts.addressprint)
{
annotate_field (4);
uiout->field_skip ("addr");
}
std::string msg;
annotate_field (5);
if (is_load)
{
if (regex)
msg = string_printf (_("load of library matching %s"),
regex.get ());
else
msg = _("load of library");
}
else
{
if (regex)
msg = string_printf (_("unload of library matching %s"),
regex.get ());
else
msg = _("unload of library");
}
uiout->field_string ("what", msg);
if (uiout->is_mi_like_p ())
uiout->field_string ("catch-type", is_load ? "load" : "unload");
return true;
}
void
solib_catchpoint::print_mention () const
{
gdb_printf (_("Catchpoint %d (%s)"), number,
is_load ? "load" : "unload");
}
void
solib_catchpoint::print_recreate (struct ui_file *fp) const
{
gdb_printf (fp, "%s %s",
disposition == disp_del ? "tcatch" : "catch",
is_load ? "load" : "unload");
if (regex)
gdb_printf (fp, " %s", regex.get ());
gdb_printf (fp, "\n");
}
/* See breakpoint.h. */
void
add_solib_catchpoint (const char *arg, bool is_load, bool is_temp, bool enabled)
{
struct gdbarch *gdbarch = get_current_arch ();
if (!arg)
arg = "";
arg = skip_spaces (arg);
if (*arg == '\0')
arg = nullptr;
auto c = gdb::make_unique<solib_catchpoint> (gdbarch, is_temp, nullptr,
is_load, arg);
c->enable_state = enabled ? bp_enabled : bp_disabled;
install_breakpoint (0, std::move (c), 1);
}
/* A helper function that does all the work for "catch load" and
"catch unload". */
static void
catch_load_or_unload (const char *arg, int from_tty, int is_load,
struct cmd_list_element *command)
{
const int enabled = 1;
bool temp = command->context () == CATCH_TEMPORARY;
add_solib_catchpoint (arg, is_load, temp, enabled);
}
static void
catch_load_command_1 (const char *arg, int from_tty,
struct cmd_list_element *command)
{
catch_load_or_unload (arg, from_tty, 1, command);
}
static void
catch_unload_command_1 (const char *arg, int from_tty,
struct cmd_list_element *command)
{
catch_load_or_unload (arg, from_tty, 0, command);
}
void _initialize_break_catch_load ();
void
_initialize_break_catch_load ()
{
add_catch_command ("load", _("Catch loads of shared libraries.\n\
Usage: catch load [REGEX]\n\
If REGEX is given, only stop for libraries matching the regular expression."),
catch_load_command_1,
NULL,
CATCH_PERMANENT,
CATCH_TEMPORARY);
add_catch_command ("unload", _("Catch unloads of shared libraries.\n\
Usage: catch unload [REGEX]\n\
If REGEX is given, only stop for libraries matching the regular expression."),
catch_unload_command_1,
NULL,
CATCH_PERMANENT,
CATCH_TEMPORARY);
}
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