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/* Everything about exec catchpoints, for GDB.
Copyright (C) 1986-2022 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 "inferior.h"
#include "mi/mi-common.h"
#include "target.h"
#include "valprint.h"
/* Exec catchpoints. */
/* An instance of this type is used to represent an exec catchpoint.
A breakpoint is really of this type iff its ops pointer points to
CATCH_EXEC_BREAKPOINT_OPS. */
struct exec_catchpoint : public catchpoint
{
exec_catchpoint (struct gdbarch *gdbarch, bool temp, const char *cond_string)
: catchpoint (gdbarch, temp, cond_string)
{
}
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;
enum print_stop_action print_it (const bpstat *bs) const override;
bool print_one (bp_location **) const override;
void print_mention () const override;
void print_recreate (struct ui_file *fp) const override;
/* Filename of a program whose exec triggered this catchpoint.
This field is only valid immediately after this catchpoint has
triggered. */
gdb::unique_xmalloc_ptr<char> exec_pathname;
};
int
exec_catchpoint::insert_location (struct bp_location *bl)
{
return target_insert_exec_catchpoint (inferior_ptid.pid ());
}
int
exec_catchpoint::remove_location (struct bp_location *bl,
enum remove_bp_reason reason)
{
return target_remove_exec_catchpoint (inferior_ptid.pid ());
}
int
exec_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_EXECD)
return 0;
exec_pathname = make_unique_xstrdup (ws.execd_pathname ());
return 1;
}
enum print_stop_action
exec_catchpoint::print_it (const bpstat *bs) const
{
struct ui_out *uiout = current_uiout;
annotate_catchpoint (number);
maybe_print_thread_hit_breakpoint (uiout);
if (disposition == disp_del)
uiout->text ("Temporary catchpoint ");
else
uiout->text ("Catchpoint ");
if (uiout->is_mi_like_p ())
{
uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXEC));
uiout->field_string ("disp", bpdisp_text (disposition));
}
uiout->field_signed ("bkptno", number);
uiout->text (" (exec'd ");
uiout->field_string ("new-exec", exec_pathname.get ());
uiout->text ("), ");
return PRINT_SRC_AND_LOC;
}
bool
exec_catchpoint::print_one (bp_location **last_loc) 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)
uiout->field_skip ("addr");
annotate_field (5);
uiout->text ("exec");
if (exec_pathname != NULL)
{
uiout->text (", program \"");
uiout->field_string ("what", exec_pathname.get ());
uiout->text ("\" ");
}
if (uiout->is_mi_like_p ())
uiout->field_string ("catch-type", "exec");
return true;
}
void
exec_catchpoint::print_mention () const
{
gdb_printf (_("Catchpoint %d (exec)"), number);
}
/* Implement the "print_recreate" method for exec catchpoints. */
void
exec_catchpoint::print_recreate (struct ui_file *fp) const
{
gdb_printf (fp, "catch exec");
print_recreate_thread (fp);
}
/* This function attempts to parse an optional "if <cond>" clause
from the arg string. If one is not found, it returns NULL.
Else, it returns a pointer to the condition string. (It does not
attempt to evaluate the string against a particular block.) And,
it updates arg to point to the first character following the parsed
if clause in the arg string. */
const char *
ep_parse_optional_if_clause (const char **arg)
{
const char *cond_string;
if (((*arg)[0] != 'i') || ((*arg)[1] != 'f') || !isspace ((*arg)[2]))
return NULL;
/* Skip the "if" keyword. */
(*arg) += 2;
/* Skip any extra leading whitespace, and record the start of the
condition string. */
*arg = skip_spaces (*arg);
cond_string = *arg;
/* Assume that the condition occupies the remainder of the arg
string. */
(*arg) += strlen (cond_string);
return cond_string;
}
/* Commands to deal with catching events, such as signals, exceptions,
process start/exit, etc. */
static void
catch_exec_command_1 (const char *arg, int from_tty,
struct cmd_list_element *command)
{
struct gdbarch *gdbarch = get_current_arch ();
const char *cond_string = NULL;
bool temp = command->context () == CATCH_TEMPORARY;
if (!arg)
arg = "";
arg = skip_spaces (arg);
/* The allowed syntax is:
catch exec
catch exec if <cond>
First, check if there's an if clause. */
cond_string = ep_parse_optional_if_clause (&arg);
if ((*arg != '\0') && !isspace (*arg))
error (_("Junk at end of arguments."));
std::unique_ptr<exec_catchpoint> c
(new exec_catchpoint (gdbarch, temp, cond_string));
install_breakpoint (0, std::move (c), 1);
}
void _initialize_break_catch_exec ();
void
_initialize_break_catch_exec ()
{
add_catch_command ("exec", _("Catch calls to exec."),
catch_exec_command_1,
NULL,
CATCH_PERMANENT,
CATCH_TEMPORARY);
}
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