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74daa597e7
The new_objfile observer is currently used to indicate both when a new
objfile is added to program space (when passed non-nullptr) and when all
objfiles of a program space were just removed (when passed nullptr).
I think this is confusing (and Andrew apparently thinks so too [1]).
Add a new "all_objfiles_removed" observer to remove the second role from
"new_objfile".
Some existing users of new_objfile do nothing if the passed objfile is
nullptr. For them, we can simply drop the nullptr check. For others,
add a new all_objfiles_removed callback, and refactor things a bit to
keep the existing behavior as much as possible.
Some callbacks relied on current_program_space, and following
the refactoring now use either objfile->pspace or the pspace passed to
all_objfiles_removed. I think this should be relatively safe, and in
general a step in the right direction.
On the notify side, I found only one call site to change from
new_objfile to all_objfiles_removed, in clear_symtab_users. It is not
entirely clear to me that this is entirely correct. clear_symtab_users
appears to be called in spots that don't remove all objfiles
(functions finish_new_objfile, remove_symbol_file_command, reread_symbols,
do_module_cleanups). But I think that this patch at least makes the
current code clearer.
[1] a0a031bce0
Change-Id: Icb648f72862e056267f30f44dd439bd4ec766f13
Approved-By: Tom Tromey <tom@tromey.com>
98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/* Copyright (C) 2012-2023 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "command.h"
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#include "gdbcmd.h"
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#include "target.h"
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#include "gdbsupport/agent.h"
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#include "observable.h"
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#include "objfiles.h"
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/* Enum strings for "set|show agent". */
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static const char can_use_agent_on[] = "on";
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static const char can_use_agent_off[] = "off";
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static const char * const can_use_agent_enum[] =
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{
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can_use_agent_on,
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can_use_agent_off,
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NULL,
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};
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static const char *can_use_agent = can_use_agent_off;
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static void
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show_can_use_agent (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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gdb_printf (file,
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_("Debugger's willingness to use agent in inferior "
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"as a helper is %s.\n"), value);
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}
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static void
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set_can_use_agent (const char *args, int from_tty, struct cmd_list_element *c)
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{
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bool can_use = (can_use_agent == can_use_agent_on);
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if (can_use && !agent_loaded_p ())
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{
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/* Since the setting was off, we may not have observed the objfiles and
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therefore not looked up the required symbols. Do so now. */
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for (objfile *objfile : current_program_space->objfiles ())
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if (agent_look_up_symbols (objfile) == 0)
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break;
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}
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if (target_use_agent (can_use) == 0)
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/* Something wrong during setting, set flag to default value. */
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can_use_agent = can_use_agent_off;
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}
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static void
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agent_new_objfile (struct objfile *objfile)
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{
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if (agent_loaded_p ())
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return;
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if (can_use_agent == can_use_agent_off)
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return;
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agent_look_up_symbols (objfile);
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}
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void _initialize_agent ();
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void
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_initialize_agent ()
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{
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gdb::observers::new_objfile.attach (agent_new_objfile,
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"agent");
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add_setshow_enum_cmd ("agent", class_run,
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can_use_agent_enum,
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&can_use_agent, _("\
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Set debugger's willingness to use agent as a helper."), _("\
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Show debugger's willingness to use agent as a helper."), _("\
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If on, GDB will delegate some of the debugging operations to the\n\
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agent, if the target supports it. This will speed up those\n\
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operations that are supported by the agent.\n\
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If off, GDB will not use agent, even if such is supported by the\n\
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target."),
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set_can_use_agent,
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show_can_use_agent,
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&setlist, &showlist);
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}
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