1192f124a3
The rationale for this patch comes from the ROCm port [1], the goal
being to reduce the number of back and forths between GDB and the
target when doing successive operations. I'll start with explaining
the rationale and then go over the implementation. In the ROCm / GPU
world, the term "wave" is somewhat equivalent to a "thread" in GDB.
So if you read if from a GPU stand point, just s/thread/wave/.
ROCdbgapi, the library used by GDB [2] to communicate with the GPU
target, gives the illusion that it's possible for the debugger to
control (start and stop) individual threads. But in reality, this is
not how it works. Under the hood, all threads of a queue are
controlled as a group. To stop one thread in a group of running ones,
the state of all threads is retrieved from the GPU, all threads are
destroyed, and all threads but the one we want to stop are re-created
from the saved state. The net result, from the point of view of GDB,
is that the library stopped one thread. The same thing goes if we
want to resume one thread while others are running: the state of all
running threads is retrieved from the GPU, they are all destroyed, and
they are all re-created, including the thread we want to resume.
This leads to some inefficiencies when combined with how GDB works,
here are two examples:
- Stopping all threads: because the target operates in non-stop mode,
when the user interface mode is all-stop, GDB must stop all threads
individually when presenting a stop. Let's suppose we have 1000
threads and the user does ^C. GDB asks the target to stop one
thread. Behind the scenes, the library retrieves 1000 thread
states and restores the 999 others still running ones. GDB asks
the target to stop another one. The target retrieves 999 thread
states and restores the 998 remaining ones. That means that to
stop 1000 threads, we did 1000 back and forths with the GPU. It
would have been much better to just retrieve the states once and
stop there.
- Resuming with pending events: suppose the 1000 threads hit a
breakpoint at the same time. The breakpoint is conditional and
evaluates to true for the first thread, to false for all others.
GDB pulls one event (for the first thread) from the target, decides
that it should present a stop, so stops all threads using
stop_all_threads. All these other threads have a breakpoint event
to report, which is saved in `thread_info::suspend::waitstatus` for
later. When the user does "continue", GDB resumes that one thread
that did hit the breakpoint. It then processes the pending events
one by one as if they just arrived. It picks one, evaluates the
condition to false, and resumes the thread. It picks another one,
evaluates the condition to false, and resumes the thread. And so
on. In between each resumption, there is a full state retrieval
and re-creation. It would be much nicer if we could wait a little
bit before sending those threads on the GPU, until it processed all
those pending events.
To address this kind of performance issue, ROCdbgapi has a concept
called "forward progress required", which is a boolean state that
allows its user (i.e. GDB) to say "I'm doing a bunch of operations,
you can hold off putting the threads on the GPU until I'm done" (the
"forward progress not required" state). Turning forward progress back
on indicates to the library that all threads that are supposed to be
running should now be really running on the GPU.
It turns out that GDB has a similar concept, though not as general,
commit_resume. One difference is that commit_resume is not stateful:
the target can't look up "does the core need me to schedule resumed
threads for execution right now". It is also specifically linked to
the resume method, it is not used in other contexts. The target
accumulates resumption requests through target_ops::resume calls, and
then commits those resumptions when target_ops::commit_resume is
called. The target has no way to check if it's ok to leave resumed
threads stopped in other target methods.
To bridge the gap, this patch generalizes the commit_resume concept in
GDB to match the forward progress concept of ROCdbgapi. The current
name (commit_resume) can be interpreted as "commit the previous resume
calls". I renamed the concept to "commit_resumed", as in "commit the
threads that are resumed".
In the new version, we have two things:
- the commit_resumed_state field in process_stratum_target: indicates
whether GDB requires target stacks using this target to have
resumed threads committed to the execution target/device. If
false, an execution target is allowed to leave resumed threads
un-committed at the end of whatever method it is executing.
- the commit_resumed target method: called when commit_resumed_state
transitions from false to true. While commit_resumed_state was
false, the target may have left some resumed threads un-committed.
This method being called tells it that it should commit them back
to the execution device.
Let's take the "Stopping all threads" scenario from above and see how
it would work with the ROCm target with this change. Before stopping
all threads, GDB would set the target's commit_resumed_state field to
false. It would then ask the target to stop the first thread. The
target would retrieve all threads' state from the GPU and mark that
one as stopped. Since commit_resumed_state is false, it leaves all
the other threads (still resumed) stopped. GDB would then proceed to
call target_stop for all the other threads. Since resumed threads are
not committed, this doesn't do any back and forth with the GPU.
To simplify the implementation of targets, this patch makes it so that
when calling certain target methods, the contract between the core and
the targets guarantees that commit_resumed_state is false. This way,
the target doesn't need two paths, one for commit_resumed_state ==
true and one for commit_resumed_state == false. It can just assert
that commit_resumed_state is false and work with that assumption.
This also helps catch places where we forgot to disable
commit_resumed_state before calling the method, which represents a
probable optimization opportunity. The commit adds assertions in the
target method wrappers (target_resume and friends) to have some
confidence that this contract between the core and the targets is
respected.
The scoped_disable_commit_resumed type is used to disable the commit
resumed state of all process targets on construction, and selectively
re-enable it on destruction (see below for criteria). Note that it
only sets the process_stratum_target::commit_resumed_state flag. A
subsequent call to maybe_call_commit_resumed_all_targets is necessary
to call the commit_resumed method on all target stacks with process
targets that got their commit_resumed_state flag turned back on. This
separation is because we don't want to call the commit_resumed methods
in scoped_disable_commit_resumed's destructor, as they may throw.
On destruction, commit-resumed is not re-enabled for a given target
if:
1. this target has no threads resumed, or
2. this target has at least one resumed thread with a pending status
known to the core (saved in thread_info::suspend::waitstatus).
The first point is not technically necessary, because a proper
commit_resumed implementation would be a no-op if the target has no
resumed threads. But since we have a flag do to a quick check, it
shouldn't hurt.
The second point is more important: together with the
scoped_disable_commit_resumed instance added in fetch_inferior_event,
it makes it so the "Resuming with pending events" described above is
handled efficiently. Here's what happens in that case:
1. The user types "continue".
2. Upon destruction, the scoped_disable_commit_resumed in the
`proceed` function does not enable commit-resumed, as it sees some
threads have pending statuses.
3. fetch_inferior_event is called to handle another event, the
breakpoint hit evaluates to false, and that thread is resumed.
Because there are still more threads with pending statuses, the
destructor of scoped_disable_commit_resumed in
fetch_inferior_event still doesn't enable commit-resumed.
4. Rinse and repeat step 3, until the last pending status is handled
by fetch_inferior_event. In that case,
scoped_disable_commit_resumed's destructor sees there are no more
threads with pending statues, so it asks the target to commit
resumed threads.
This allows us to avoid all unnecessary back and forths, there is a
single commit_resumed call once all pending statuses are processed.
This change required remote_target::remote_stop_ns to learn how to
handle stopping threads that were resumed but pending vCont. The
simplest example where that happens is when using the remote target in
all-stop, but with "maint set target-non-stop on", to force it to
operate in non-stop mode under the hood. If two threads hit a
breakpoint at the same time, GDB will receive two stop replies. It
will present the stop for one thread and save the other one in
thread_info::suspend::waitstatus.
Before this patch, when doing "continue", GDB first resumes the thread
without a pending status:
Sending packet: $vCont;c:p172651.172676#f3
It then consumes the pending status in the next fetch_inferior_event
call:
[infrun] do_target_wait_1: Using pending wait status status->kind = stopped, signal = GDB_SIGNAL_TRAP for Thread 1517137.1517137.
[infrun] target_wait (-1.0.0, status) =
[infrun] 1517137.1517137.0 [Thread 1517137.1517137],
[infrun] status->kind = stopped, signal = GDB_SIGNAL_TRAP
It then realizes it needs to stop all threads to present the stop, so
stops the thread it just resumed:
[infrun] stop_all_threads: Thread 1517137.1517137 not executing
[infrun] stop_all_threads: Thread 1517137.1517174 executing, need stop
remote_stop called
Sending packet: $vCont;t:p172651.172676#04
This is an unnecessary resume/stop. With this patch, we don't commit
resumed threads after proceeding, because of the pending status:
[infrun] maybe_commit_resumed_all_process_targets: not requesting commit-resumed for target extended-remote, a thread has a pending waitstatus
When GDB handles the pending status and stop_all_threads runs, we stop a
resumed but pending vCont thread:
remote_stop_ns: Enqueueing phony stop reply for thread pending vCont-resume (1520940, 1520976, 0)
That thread was never actually resumed on the remote stub / gdbserver,
so we shouldn't send a packet to the remote side asking to stop the
thread.
Note that there are paths that resume the target and then do a
synchronous blocking wait, in sort of nested event loop, via
wait_sync_command_done. For example, inferior function calls, or any
run control command issued from a breakpoint command list. We handle
that making wait_sync_command_one a "sync" point -- force forward
progress, or IOW, force-enable commit-resumed state.
gdb/ChangeLog:
yyyy-mm-dd Simon Marchi <simon.marchi@efficios.com>
Pedro Alves <pedro@palves.net>
* infcmd.c (run_command_1, attach_command, detach_command)
(interrupt_target_1): Use scoped_disable_commit_resumed.
* infrun.c (do_target_resume): Remove
target_commit_resume call.
(commit_resume_all_targets): Remove.
(maybe_set_commit_resumed_all_targets): New.
(maybe_call_commit_resumed_all_targets): New.
(enable_commit_resumed): New.
(scoped_disable_commit_resumed::scoped_disable_commit_resumed)
(scoped_disable_commit_resumed::~scoped_disable_commit_resumed)
(scoped_disable_commit_resumed::reset)
(scoped_disable_commit_resumed::reset_and_commit)
(scoped_enable_commit_resumed::scoped_enable_commit_resumed)
(scoped_enable_commit_resumed::~scoped_enable_commit_resumed):
New.
(proceed): Use scoped_disable_commit_resumed and
maybe_call_commit_resumed_all_targets.
(fetch_inferior_event): Use scoped_disable_commit_resumed.
* infrun.h (struct scoped_disable_commit_resumed): New.
(maybe_call_commit_resumed_all_process_targets): New.
(struct scoped_enable_commit_resumed): New.
* mi/mi-main.c (exec_continue): Use scoped_disable_commit_resumed.
* process-stratum-target.h (class process_stratum_target):
<commit_resumed_state>: New.
* record-full.c (record_full_wait_1): Change commit_resumed_state
around calling commit_resumed.
* remote.c (class remote_target) <commit_resume>: Rename to...
<commit_resumed>: ... this.
(struct stop_reply): Move up.
(remote_target::commit_resume): Rename to...
(remote_target::commit_resumed): ... this. Check if there is any
thread pending vCont resume.
(remote_target::remote_stop_ns): Generate stop replies for resumed
but pending vCont threads.
(remote_target::wait_ns): Add gdb_assert.
* target-delegates.c: Regenerate.
* target.c (target_wait, target_resume): Assert that the current
process_stratum target isn't in commit-resumed state.
(defer_target_commit_resume): Remove.
(target_commit_resume): Remove.
(target_commit_resumed): New.
(make_scoped_defer_target_commit_resume): Remove.
(target_stop): Assert that the current process_stratum target
isn't in commit-resumed state.
* target.h (struct target_ops) <commit_resume>: Rename to ...
<commit_resumed>: ... this.
(target_commit_resume): Remove.
(target_commit_resumed): New.
(make_scoped_defer_target_commit_resume): Remove.
* top.c (wait_sync_command_done): Use
scoped_enable_commit_resumed.
[1] https://github.com/ROCm-Developer-Tools/ROCgdb/
[2] https://github.com/ROCm-Developer-Tools/ROCdbgapi
Change-Id: I836135531a29214b21695736deb0a81acf8cf566
2371 lines
67 KiB
C
2371 lines
67 KiB
C
/* Top level stuff for GDB, the GNU debugger.
|
||
|
||
Copyright (C) 1986-2021 Free Software Foundation, Inc.
|
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|
||
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 "gdbcmd.h"
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||
#include "cli/cli-cmds.h"
|
||
#include "cli/cli-script.h"
|
||
#include "cli/cli-setshow.h"
|
||
#include "cli/cli-decode.h"
|
||
#include "symtab.h"
|
||
#include "inferior.h"
|
||
#include "infrun.h"
|
||
#include <signal.h>
|
||
#include "target.h"
|
||
#include "target-dcache.h"
|
||
#include "breakpoint.h"
|
||
#include "gdbtypes.h"
|
||
#include "expression.h"
|
||
#include "value.h"
|
||
#include "language.h"
|
||
#include "terminal.h"
|
||
#include "gdbsupport/job-control.h"
|
||
#include "annotate.h"
|
||
#include "completer.h"
|
||
#include "top.h"
|
||
#include "gdbsupport/version.h"
|
||
#include "serial.h"
|
||
#include "main.h"
|
||
#include "gdbsupport/event-loop.h"
|
||
#include "gdbthread.h"
|
||
#include "extension.h"
|
||
#include "interps.h"
|
||
#include "observable.h"
|
||
#include "maint.h"
|
||
#include "filenames.h"
|
||
#include "frame.h"
|
||
#include "gdbsupport/buffer.h"
|
||
#include "gdbsupport/gdb_select.h"
|
||
#include "gdbsupport/scope-exit.h"
|
||
#include "gdbarch.h"
|
||
#include "gdbsupport/pathstuff.h"
|
||
#include "cli/cli-style.h"
|
||
|
||
/* readline include files. */
|
||
#include "readline/readline.h"
|
||
#include "readline/history.h"
|
||
|
||
/* readline defines this. */
|
||
#undef savestring
|
||
|
||
#include <sys/types.h>
|
||
|
||
#include "event-top.h"
|
||
#include <sys/stat.h>
|
||
#include <ctype.h>
|
||
#include "ui-out.h"
|
||
#include "cli-out.h"
|
||
#include "tracepoint.h"
|
||
#include "inf-loop.h"
|
||
|
||
#if defined(TUI)
|
||
# include "tui/tui.h"
|
||
#endif
|
||
|
||
#ifndef O_NOCTTY
|
||
# define O_NOCTTY 0
|
||
#endif
|
||
|
||
extern void initialize_all_files (void);
|
||
|
||
static bool history_filename_empty (void);
|
||
|
||
#define PROMPT(X) the_prompts.prompt_stack[the_prompts.top + X].prompt
|
||
#define PREFIX(X) the_prompts.prompt_stack[the_prompts.top + X].prefix
|
||
#define SUFFIX(X) the_prompts.prompt_stack[the_prompts.top + X].suffix
|
||
|
||
/* Default command line prompt. This is overridden in some configs. */
|
||
|
||
#ifndef DEFAULT_PROMPT
|
||
#define DEFAULT_PROMPT "(gdb) "
|
||
#endif
|
||
|
||
struct ui_file **
|
||
current_ui_gdb_stdout_ptr ()
|
||
{
|
||
return ¤t_ui->m_gdb_stdout;
|
||
}
|
||
|
||
struct ui_file **
|
||
current_ui_gdb_stdin_ptr ()
|
||
{
|
||
return ¤t_ui->m_gdb_stdin;
|
||
}
|
||
|
||
struct ui_file **
|
||
current_ui_gdb_stderr_ptr ()
|
||
{
|
||
return ¤t_ui->m_gdb_stderr;
|
||
}
|
||
|
||
struct ui_file **
|
||
current_ui_gdb_stdlog_ptr ()
|
||
{
|
||
return ¤t_ui->m_gdb_stdlog;
|
||
}
|
||
|
||
struct ui_out **
|
||
current_ui_current_uiout_ptr ()
|
||
{
|
||
return ¤t_ui->m_current_uiout;
|
||
}
|
||
|
||
int inhibit_gdbinit = 0;
|
||
|
||
/* Flag for whether we want to confirm potentially dangerous
|
||
operations. Default is yes. */
|
||
|
||
bool confirm = true;
|
||
|
||
static void
|
||
show_confirm (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Whether to confirm potentially "
|
||
"dangerous operations is %s.\n"),
|
||
value);
|
||
}
|
||
|
||
/* Current working directory. */
|
||
|
||
char *current_directory;
|
||
|
||
/* The last command line executed on the console. Used for command
|
||
repetitions when the user enters an empty line. */
|
||
|
||
static char *saved_command_line;
|
||
|
||
/* If not NULL, the arguments that should be passed if
|
||
saved_command_line is repeated. */
|
||
|
||
static const char *repeat_arguments;
|
||
|
||
/* The previous last command line executed on the console. Used for command
|
||
repetitions when a command wants to relaunch the previously launched
|
||
command. We need this as when a command is running, saved_command_line
|
||
already contains the line of the currently executing command. */
|
||
|
||
static char *previous_saved_command_line;
|
||
|
||
/* If not NULL, the arguments that should be passed if the
|
||
previous_saved_command_line is repeated. */
|
||
|
||
static const char *previous_repeat_arguments;
|
||
|
||
/* Nonzero if the current command is modified by "server ". This
|
||
affects things like recording into the command history, commands
|
||
repeating on RETURN, etc. This is so a user interface (emacs, GUI,
|
||
whatever) can issue its own commands and also send along commands
|
||
from the user, and have the user not notice that the user interface
|
||
is issuing commands too. */
|
||
bool server_command;
|
||
|
||
/* Timeout limit for response from target. */
|
||
|
||
/* The default value has been changed many times over the years. It
|
||
was originally 5 seconds. But that was thought to be a long time
|
||
to sit and wait, so it was changed to 2 seconds. That was thought
|
||
to be plenty unless the connection was going through some terminal
|
||
server or multiplexer or other form of hairy serial connection.
|
||
|
||
In mid-1996, remote_timeout was moved from remote.c to top.c and
|
||
it began being used in other remote-* targets. It appears that the
|
||
default was changed to 20 seconds at that time, perhaps because the
|
||
Renesas E7000 ICE didn't always respond in a timely manner.
|
||
|
||
But if 5 seconds is a long time to sit and wait for retransmissions,
|
||
20 seconds is far worse. This demonstrates the difficulty of using
|
||
a single variable for all protocol timeouts.
|
||
|
||
As remote.c is used much more than remote-e7000.c, it was changed
|
||
back to 2 seconds in 1999. */
|
||
|
||
int remote_timeout = 2;
|
||
|
||
/* Sbrk location on entry to main. Used for statistics only. */
|
||
#ifdef HAVE_USEFUL_SBRK
|
||
char *lim_at_start;
|
||
#endif
|
||
|
||
/* Hooks for alternate command interfaces. */
|
||
|
||
/* This hook is called from within gdb's many mini-event loops which
|
||
could steal control from a real user interface's event loop. It
|
||
returns non-zero if the user is requesting a detach, zero
|
||
otherwise. */
|
||
|
||
int (*deprecated_ui_loop_hook) (int);
|
||
|
||
|
||
/* Called from print_frame_info to list the line we stopped in. */
|
||
|
||
void (*deprecated_print_frame_info_listing_hook) (struct symtab * s,
|
||
int line,
|
||
int stopline,
|
||
int noerror);
|
||
/* Replaces most of query. */
|
||
|
||
int (*deprecated_query_hook) (const char *, va_list);
|
||
|
||
/* Replaces most of warning. */
|
||
|
||
void (*deprecated_warning_hook) (const char *, va_list);
|
||
|
||
/* These three functions support getting lines of text from the user.
|
||
They are used in sequence. First deprecated_readline_begin_hook is
|
||
called with a text string that might be (for example) a message for
|
||
the user to type in a sequence of commands to be executed at a
|
||
breakpoint. If this function calls back to a GUI, it might take
|
||
this opportunity to pop up a text interaction window with this
|
||
message. Next, deprecated_readline_hook is called with a prompt
|
||
that is emitted prior to collecting the user input. It can be
|
||
called multiple times. Finally, deprecated_readline_end_hook is
|
||
called to notify the GUI that we are done with the interaction
|
||
window and it can close it. */
|
||
|
||
void (*deprecated_readline_begin_hook) (const char *, ...);
|
||
char *(*deprecated_readline_hook) (const char *);
|
||
void (*deprecated_readline_end_hook) (void);
|
||
|
||
/* Called as appropriate to notify the interface that we have attached
|
||
to or detached from an already running process. */
|
||
|
||
void (*deprecated_attach_hook) (void);
|
||
void (*deprecated_detach_hook) (void);
|
||
|
||
/* Called when going to wait for the target. Usually allows the GUI
|
||
to run while waiting for target events. */
|
||
|
||
ptid_t (*deprecated_target_wait_hook) (ptid_t ptid,
|
||
struct target_waitstatus *status,
|
||
int options);
|
||
|
||
/* Used by UI as a wrapper around command execution. May do various
|
||
things like enabling/disabling buttons, etc... */
|
||
|
||
void (*deprecated_call_command_hook) (struct cmd_list_element * c,
|
||
const char *cmd, int from_tty);
|
||
|
||
/* Called when the current thread changes. Argument is thread id. */
|
||
|
||
void (*deprecated_context_hook) (int id);
|
||
|
||
/* The highest UI number ever assigned. */
|
||
static int highest_ui_num;
|
||
|
||
/* See top.h. */
|
||
|
||
ui::ui (FILE *instream_, FILE *outstream_, FILE *errstream_)
|
||
: next (nullptr),
|
||
num (++highest_ui_num),
|
||
call_readline (nullptr),
|
||
input_handler (nullptr),
|
||
command_editing (0),
|
||
interp_info (nullptr),
|
||
async (0),
|
||
secondary_prompt_depth (0),
|
||
stdin_stream (instream_),
|
||
instream (instream_),
|
||
outstream (outstream_),
|
||
errstream (errstream_),
|
||
input_fd (fileno (instream)),
|
||
input_interactive_p (ISATTY (instream)),
|
||
prompt_state (PROMPT_NEEDED),
|
||
m_gdb_stdout (new stdio_file (outstream)),
|
||
m_gdb_stdin (new stdio_file (instream)),
|
||
m_gdb_stderr (new stderr_file (errstream)),
|
||
m_gdb_stdlog (m_gdb_stderr),
|
||
m_current_uiout (nullptr)
|
||
{
|
||
buffer_init (&line_buffer);
|
||
|
||
if (ui_list == NULL)
|
||
ui_list = this;
|
||
else
|
||
{
|
||
struct ui *last;
|
||
|
||
for (last = ui_list; last->next != NULL; last = last->next)
|
||
;
|
||
last->next = this;
|
||
}
|
||
}
|
||
|
||
ui::~ui ()
|
||
{
|
||
struct ui *ui, *uiprev;
|
||
|
||
uiprev = NULL;
|
||
|
||
for (ui = ui_list; ui != NULL; uiprev = ui, ui = ui->next)
|
||
if (ui == this)
|
||
break;
|
||
|
||
gdb_assert (ui != NULL);
|
||
|
||
if (uiprev != NULL)
|
||
uiprev->next = next;
|
||
else
|
||
ui_list = next;
|
||
|
||
delete m_gdb_stdin;
|
||
delete m_gdb_stdout;
|
||
delete m_gdb_stderr;
|
||
}
|
||
|
||
/* Open file named NAME for read/write, making sure not to make it the
|
||
controlling terminal. */
|
||
|
||
static gdb_file_up
|
||
open_terminal_stream (const char *name)
|
||
{
|
||
int fd;
|
||
|
||
fd = gdb_open_cloexec (name, O_RDWR | O_NOCTTY, 0);
|
||
if (fd < 0)
|
||
perror_with_name (_("opening terminal failed"));
|
||
|
||
return gdb_file_up (fdopen (fd, "w+"));
|
||
}
|
||
|
||
/* Implementation of the "new-ui" command. */
|
||
|
||
static void
|
||
new_ui_command (const char *args, int from_tty)
|
||
{
|
||
int argc;
|
||
const char *interpreter_name;
|
||
const char *tty_name;
|
||
|
||
dont_repeat ();
|
||
|
||
gdb_argv argv (args);
|
||
argc = argv.count ();
|
||
|
||
if (argc < 2)
|
||
error (_("Usage: new-ui INTERPRETER TTY"));
|
||
|
||
interpreter_name = argv[0];
|
||
tty_name = argv[1];
|
||
|
||
{
|
||
scoped_restore save_ui = make_scoped_restore (¤t_ui);
|
||
|
||
/* Open specified terminal. Note: we used to open it three times,
|
||
once for each of stdin/stdout/stderr, but that does not work
|
||
with Windows named pipes. */
|
||
gdb_file_up stream = open_terminal_stream (tty_name);
|
||
|
||
std::unique_ptr<ui> ui
|
||
(new struct ui (stream.get (), stream.get (), stream.get ()));
|
||
|
||
ui->async = 1;
|
||
|
||
current_ui = ui.get ();
|
||
|
||
set_top_level_interpreter (interpreter_name);
|
||
|
||
interp_pre_command_loop (top_level_interpreter ());
|
||
|
||
/* Make sure the file is not closed. */
|
||
stream.release ();
|
||
|
||
ui.release ();
|
||
}
|
||
|
||
printf_unfiltered ("New UI allocated\n");
|
||
}
|
||
|
||
/* Handler for SIGHUP. */
|
||
|
||
#ifdef SIGHUP
|
||
/* NOTE 1999-04-29: This function will be static again, once we modify
|
||
gdb to use the event loop as the default command loop and we merge
|
||
event-top.c into this file, top.c. */
|
||
/* static */ void
|
||
quit_cover (void)
|
||
{
|
||
/* Stop asking user for confirmation --- we're exiting. This
|
||
prevents asking the user dumb questions. */
|
||
confirm = 0;
|
||
quit_command ((char *) 0, 0);
|
||
}
|
||
#endif /* defined SIGHUP */
|
||
|
||
/* Line number we are currently in, in a file which is being sourced. */
|
||
/* NOTE 1999-04-29: This variable will be static again, once we modify
|
||
gdb to use the event loop as the default command loop and we merge
|
||
event-top.c into this file, top.c. */
|
||
/* static */ int source_line_number;
|
||
|
||
/* Name of the file we are sourcing. */
|
||
/* NOTE 1999-04-29: This variable will be static again, once we modify
|
||
gdb to use the event loop as the default command loop and we merge
|
||
event-top.c into this file, top.c. */
|
||
/* static */ std::string source_file_name;
|
||
|
||
/* Read commands from STREAM. */
|
||
void
|
||
read_command_file (FILE *stream)
|
||
{
|
||
struct ui *ui = current_ui;
|
||
|
||
scoped_restore save_instream
|
||
= make_scoped_restore (&ui->instream, stream);
|
||
|
||
/* Read commands from `instream' and execute them until end of file
|
||
or error reading instream. */
|
||
|
||
while (ui->instream != NULL && !feof (ui->instream))
|
||
{
|
||
const char *command;
|
||
|
||
/* Get a command-line. This calls the readline package. */
|
||
command = command_line_input (NULL, NULL);
|
||
if (command == NULL)
|
||
break;
|
||
command_handler (command);
|
||
}
|
||
}
|
||
|
||
#ifdef __MSDOS__
|
||
static void
|
||
do_chdir_cleanup (void *old_dir)
|
||
{
|
||
chdir ((const char *) old_dir);
|
||
xfree (old_dir);
|
||
}
|
||
#endif
|
||
|
||
scoped_value_mark
|
||
prepare_execute_command ()
|
||
{
|
||
/* With multiple threads running while the one we're examining is
|
||
stopped, the dcache can get stale without us being able to detect
|
||
it. For the duration of the command, though, use the dcache to
|
||
help things like backtrace. */
|
||
if (non_stop)
|
||
target_dcache_invalidate ();
|
||
|
||
return scoped_value_mark ();
|
||
}
|
||
|
||
/* Tell the user if the language has changed (except first time) after
|
||
executing a command. */
|
||
|
||
void
|
||
check_frame_language_change (void)
|
||
{
|
||
static int warned = 0;
|
||
struct frame_info *frame;
|
||
|
||
/* First make sure that a new frame has been selected, in case the
|
||
command or the hooks changed the program state. */
|
||
frame = deprecated_safe_get_selected_frame ();
|
||
if (current_language != expected_language)
|
||
{
|
||
if (language_mode == language_mode_auto && info_verbose)
|
||
{
|
||
language_info (1); /* Print what changed. */
|
||
}
|
||
warned = 0;
|
||
}
|
||
|
||
/* Warn the user if the working language does not match the language
|
||
of the current frame. Only warn the user if we are actually
|
||
running the program, i.e. there is a stack. */
|
||
/* FIXME: This should be cacheing the frame and only running when
|
||
the frame changes. */
|
||
|
||
if (has_stack_frames ())
|
||
{
|
||
enum language flang;
|
||
|
||
flang = get_frame_language (frame);
|
||
if (!warned
|
||
&& flang != language_unknown
|
||
&& flang != current_language->la_language)
|
||
{
|
||
printf_filtered ("%s\n", _(lang_frame_mismatch_warn));
|
||
warned = 1;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* See top.h. */
|
||
|
||
void
|
||
wait_sync_command_done (void)
|
||
{
|
||
/* Processing events may change the current UI. */
|
||
scoped_restore save_ui = make_scoped_restore (¤t_ui);
|
||
struct ui *ui = current_ui;
|
||
|
||
/* We're about to wait until the target stops after having resumed
|
||
it so must force-commit resumptions, in case we're being called
|
||
in some context where a scoped_disable_commit_resumed object is
|
||
active. I.e., this function is a commit-resumed sync/flush
|
||
point. */
|
||
scoped_enable_commit_resumed enable ("sync wait");
|
||
|
||
while (gdb_do_one_event () >= 0)
|
||
if (ui->prompt_state != PROMPT_BLOCKED)
|
||
break;
|
||
}
|
||
|
||
/* See top.h. */
|
||
|
||
void
|
||
maybe_wait_sync_command_done (int was_sync)
|
||
{
|
||
/* If the interpreter is in sync mode (we're running a user
|
||
command's list, running command hooks or similars), and we
|
||
just ran a synchronous command that started the target, wait
|
||
for that command to end. */
|
||
if (!current_ui->async
|
||
&& !was_sync
|
||
&& current_ui->prompt_state == PROMPT_BLOCKED)
|
||
wait_sync_command_done ();
|
||
}
|
||
|
||
/* See command.h. */
|
||
|
||
void
|
||
set_repeat_arguments (const char *args)
|
||
{
|
||
repeat_arguments = args;
|
||
}
|
||
|
||
/* Execute the line P as a command, in the current user context.
|
||
Pass FROM_TTY as second argument to the defining function. */
|
||
|
||
void
|
||
execute_command (const char *p, int from_tty)
|
||
{
|
||
struct cmd_list_element *c;
|
||
const char *line;
|
||
const char *cmd_start = p;
|
||
|
||
auto cleanup_if_error = make_scope_exit (bpstat_clear_actions);
|
||
scoped_value_mark cleanup = prepare_execute_command ();
|
||
|
||
/* This can happen when command_line_input hits end of file. */
|
||
if (p == NULL)
|
||
{
|
||
cleanup_if_error.release ();
|
||
return;
|
||
}
|
||
|
||
target_log_command (p);
|
||
|
||
while (*p == ' ' || *p == '\t')
|
||
p++;
|
||
if (*p)
|
||
{
|
||
const char *cmd = p;
|
||
const char *arg;
|
||
std::string default_args;
|
||
std::string default_args_and_arg;
|
||
int was_sync = current_ui->prompt_state == PROMPT_BLOCKED;
|
||
|
||
line = p;
|
||
|
||
/* If trace-commands is set then this will print this command. */
|
||
print_command_trace ("%s", p);
|
||
|
||
c = lookup_cmd (&cmd, cmdlist, "", &default_args, 0, 1);
|
||
p = cmd;
|
||
|
||
scoped_restore save_repeat_args
|
||
= make_scoped_restore (&repeat_arguments, nullptr);
|
||
const char *args_pointer = p;
|
||
|
||
if (!default_args.empty ())
|
||
{
|
||
if (*p != '\0')
|
||
default_args_and_arg = default_args + ' ' + p;
|
||
else
|
||
default_args_and_arg = default_args;
|
||
arg = default_args_and_arg.c_str ();
|
||
}
|
||
else
|
||
{
|
||
/* Pass null arg rather than an empty one. */
|
||
arg = *p == '\0' ? nullptr : p;
|
||
}
|
||
|
||
/* FIXME: cagney/2002-02-02: The c->type test is pretty dodgy
|
||
while the is_complete_command(cfunc) test is just plain
|
||
bogus. They should both be replaced by a test of the form
|
||
c->strip_trailing_white_space_p. */
|
||
/* NOTE: cagney/2002-02-02: The function.cfunc in the below
|
||
can't be replaced with func. This is because it is the
|
||
cfunc, and not the func, that has the value that the
|
||
is_complete_command hack is testing for. */
|
||
/* Clear off trailing whitespace, except for set and complete
|
||
command. */
|
||
std::string without_whitespace;
|
||
if (arg
|
||
&& c->type != set_cmd
|
||
&& !is_complete_command (c))
|
||
{
|
||
const char *old_end = arg + strlen (arg) - 1;
|
||
p = old_end;
|
||
while (p >= arg && (*p == ' ' || *p == '\t'))
|
||
p--;
|
||
if (p != old_end)
|
||
{
|
||
without_whitespace = std::string (arg, p + 1);
|
||
arg = without_whitespace.c_str ();
|
||
}
|
||
}
|
||
|
||
/* If this command has been pre-hooked, run the hook first. */
|
||
execute_cmd_pre_hook (c);
|
||
|
||
if (c->deprecated_warn_user)
|
||
deprecated_cmd_warning (line, cmdlist);
|
||
|
||
/* c->user_commands would be NULL in the case of a python command. */
|
||
if (c->theclass == class_user && c->user_commands)
|
||
execute_user_command (c, arg);
|
||
else if (c->theclass == class_user
|
||
&& c->prefixlist && !c->allow_unknown)
|
||
/* If this is a user defined prefix that does not allow unknown
|
||
(in other words, C is a prefix command and not a command
|
||
that can be followed by its args), report the list of
|
||
subcommands. */
|
||
{
|
||
printf_unfiltered
|
||
("\"%.*s\" must be followed by the name of a subcommand.\n",
|
||
(int) strlen (c->prefixname) - 1, c->prefixname);
|
||
help_list (*c->prefixlist, c->prefixname, all_commands, gdb_stdout);
|
||
}
|
||
else if (c->type == set_cmd)
|
||
do_set_command (arg, from_tty, c);
|
||
else if (c->type == show_cmd)
|
||
do_show_command (arg, from_tty, c);
|
||
else if (!cmd_func_p (c))
|
||
error (_("That is not a command, just a help topic."));
|
||
else if (deprecated_call_command_hook)
|
||
deprecated_call_command_hook (c, arg, from_tty);
|
||
else
|
||
cmd_func (c, arg, from_tty);
|
||
|
||
maybe_wait_sync_command_done (was_sync);
|
||
|
||
/* If this command has been post-hooked, run the hook last. */
|
||
execute_cmd_post_hook (c);
|
||
|
||
if (repeat_arguments != NULL && cmd_start == saved_command_line)
|
||
{
|
||
gdb_assert (strlen (args_pointer) >= strlen (repeat_arguments));
|
||
strcpy (saved_command_line + (args_pointer - cmd_start),
|
||
repeat_arguments);
|
||
}
|
||
}
|
||
|
||
/* Only perform the frame-language-change check if the command
|
||
we just finished executing did not resume the inferior's execution.
|
||
If it did resume the inferior, we will do that check after
|
||
the inferior stopped. */
|
||
if (has_stack_frames () && inferior_thread ()->state != THREAD_RUNNING)
|
||
check_frame_language_change ();
|
||
|
||
cleanup_if_error.release ();
|
||
}
|
||
|
||
/* Run execute_command for P and FROM_TTY. Sends its output to FILE,
|
||
do not display it to the screen. BATCH_FLAG will be
|
||
temporarily set to true. */
|
||
|
||
void
|
||
execute_command_to_ui_file (struct ui_file *file, const char *p, int from_tty)
|
||
{
|
||
/* GDB_STDOUT should be better already restored during these
|
||
restoration callbacks. */
|
||
set_batch_flag_and_restore_page_info save_page_info;
|
||
|
||
scoped_restore save_async = make_scoped_restore (¤t_ui->async, 0);
|
||
|
||
{
|
||
current_uiout->redirect (file);
|
||
ui_out_redirect_pop redirect_popper (current_uiout);
|
||
|
||
scoped_restore save_stdout
|
||
= make_scoped_restore (&gdb_stdout, file);
|
||
scoped_restore save_stderr
|
||
= make_scoped_restore (&gdb_stderr, file);
|
||
scoped_restore save_stdlog
|
||
= make_scoped_restore (&gdb_stdlog, file);
|
||
scoped_restore save_stdtarg
|
||
= make_scoped_restore (&gdb_stdtarg, file);
|
||
scoped_restore save_stdtargerr
|
||
= make_scoped_restore (&gdb_stdtargerr, file);
|
||
|
||
execute_command (p, from_tty);
|
||
}
|
||
}
|
||
|
||
/* See gdbcmd.h. */
|
||
|
||
std::string
|
||
execute_command_to_string (const char *p, int from_tty,
|
||
bool term_out)
|
||
{
|
||
string_file str_file (term_out);
|
||
|
||
execute_command_to_ui_file (&str_file, p, from_tty);
|
||
return std::move (str_file.string ());
|
||
}
|
||
|
||
|
||
/* When nonzero, cause dont_repeat to do nothing. This should only be
|
||
set via prevent_dont_repeat. */
|
||
|
||
static int suppress_dont_repeat = 0;
|
||
|
||
/* See command.h */
|
||
|
||
void
|
||
dont_repeat (void)
|
||
{
|
||
struct ui *ui = current_ui;
|
||
|
||
if (suppress_dont_repeat || server_command)
|
||
return;
|
||
|
||
/* If we aren't reading from standard input, we are saving the last
|
||
thing read from stdin in line and don't want to delete it. Null
|
||
lines won't repeat here in any case. */
|
||
if (ui->instream == ui->stdin_stream)
|
||
{
|
||
*saved_command_line = 0;
|
||
repeat_arguments = NULL;
|
||
}
|
||
}
|
||
|
||
/* See command.h */
|
||
|
||
const char *
|
||
repeat_previous ()
|
||
{
|
||
/* Do not repeat this command, as this command is a repeating command. */
|
||
dont_repeat ();
|
||
|
||
/* We cannot free saved_command_line, as this line is being executed,
|
||
so swap it with previous_saved_command_line. */
|
||
std::swap (previous_saved_command_line, saved_command_line);
|
||
std::swap (previous_repeat_arguments, repeat_arguments);
|
||
|
||
const char *prev = skip_spaces (get_saved_command_line ());
|
||
if (*prev == '\0')
|
||
error (_("No previous command to relaunch"));
|
||
return prev;
|
||
}
|
||
|
||
/* See command.h. */
|
||
|
||
scoped_restore_tmpl<int>
|
||
prevent_dont_repeat (void)
|
||
{
|
||
return make_scoped_restore (&suppress_dont_repeat, 1);
|
||
}
|
||
|
||
/* See command.h. */
|
||
|
||
char *
|
||
get_saved_command_line ()
|
||
{
|
||
return saved_command_line;
|
||
}
|
||
|
||
/* See command.h. */
|
||
|
||
void
|
||
save_command_line (const char *cmd)
|
||
{
|
||
xfree (previous_saved_command_line);
|
||
previous_saved_command_line = saved_command_line;
|
||
previous_repeat_arguments = repeat_arguments;
|
||
saved_command_line = xstrdup (cmd);
|
||
repeat_arguments = NULL;
|
||
}
|
||
|
||
|
||
/* Read a line from the stream "instream" without command line editing.
|
||
|
||
It prints PROMPT once at the start.
|
||
Action is compatible with "readline", e.g. space for the result is
|
||
malloc'd and should be freed by the caller.
|
||
|
||
A NULL return means end of file. */
|
||
|
||
static char *
|
||
gdb_readline_no_editing (const char *prompt)
|
||
{
|
||
struct buffer line_buffer;
|
||
struct ui *ui = current_ui;
|
||
/* Read from stdin if we are executing a user defined command. This
|
||
is the right thing for prompt_for_continue, at least. */
|
||
FILE *stream = ui->instream != NULL ? ui->instream : stdin;
|
||
int fd = fileno (stream);
|
||
|
||
buffer_init (&line_buffer);
|
||
|
||
if (prompt != NULL)
|
||
{
|
||
/* Don't use a _filtered function here. It causes the assumed
|
||
character position to be off, since the newline we read from
|
||
the user is not accounted for. */
|
||
fputs_unfiltered (prompt, gdb_stdout);
|
||
gdb_flush (gdb_stdout);
|
||
}
|
||
|
||
while (1)
|
||
{
|
||
int c;
|
||
fd_set readfds;
|
||
|
||
QUIT;
|
||
|
||
/* Wait until at least one byte of data is available. Control-C
|
||
can interrupt interruptible_select, but not fgetc. */
|
||
FD_ZERO (&readfds);
|
||
FD_SET (fd, &readfds);
|
||
if (interruptible_select (fd + 1, &readfds, NULL, NULL, NULL) == -1)
|
||
{
|
||
if (errno == EINTR)
|
||
{
|
||
/* If this was ctrl-c, the QUIT above handles it. */
|
||
continue;
|
||
}
|
||
perror_with_name (("select"));
|
||
}
|
||
|
||
c = fgetc (stream);
|
||
|
||
if (c == EOF)
|
||
{
|
||
if (line_buffer.used_size > 0)
|
||
/* The last line does not end with a newline. Return it, and
|
||
if we are called again fgetc will still return EOF and
|
||
we'll return NULL then. */
|
||
break;
|
||
xfree (buffer_finish (&line_buffer));
|
||
return NULL;
|
||
}
|
||
|
||
if (c == '\n')
|
||
{
|
||
if (line_buffer.used_size > 0
|
||
&& line_buffer.buffer[line_buffer.used_size - 1] == '\r')
|
||
line_buffer.used_size--;
|
||
break;
|
||
}
|
||
|
||
buffer_grow_char (&line_buffer, c);
|
||
}
|
||
|
||
buffer_grow_char (&line_buffer, '\0');
|
||
return buffer_finish (&line_buffer);
|
||
}
|
||
|
||
/* Variables which control command line editing and history
|
||
substitution. These variables are given default values at the end
|
||
of this file. */
|
||
static bool command_editing_p;
|
||
|
||
/* NOTE 1999-04-29: This variable will be static again, once we modify
|
||
gdb to use the event loop as the default command loop and we merge
|
||
event-top.c into this file, top.c. */
|
||
|
||
/* static */ bool history_expansion_p;
|
||
|
||
/* Should we write out the command history on exit? In order to write out
|
||
the history both this flag must be true, and the history_filename
|
||
variable must be set to something sensible. */
|
||
static bool write_history_p;
|
||
|
||
/* Implement 'show history save'. */
|
||
static void
|
||
show_write_history_p (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
if (!write_history_p || !history_filename_empty ())
|
||
fprintf_filtered (file, _("Saving of the history record on exit is %s.\n"),
|
||
value);
|
||
else
|
||
fprintf_filtered (file, _("Saving of the history is disabled due to "
|
||
"the value of 'history filename'.\n"));
|
||
}
|
||
|
||
/* The variable associated with the "set/show history size"
|
||
command. The value -1 means unlimited, and -2 means undefined. */
|
||
static int history_size_setshow_var = -2;
|
||
|
||
static void
|
||
show_history_size (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("The size of the command history is %s.\n"),
|
||
value);
|
||
}
|
||
|
||
/* Variable associated with the "history remove-duplicates" option.
|
||
The value -1 means unlimited. */
|
||
static int history_remove_duplicates = 0;
|
||
|
||
static void
|
||
show_history_remove_duplicates (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file,
|
||
_("The number of history entries to look back at for "
|
||
"duplicates is %s.\n"),
|
||
value);
|
||
}
|
||
|
||
/* The name of the file in which GDB history will be written. If this is
|
||
set to NULL, of the empty string then history will not be written. */
|
||
static char *history_filename;
|
||
|
||
/* Return true if the history_filename is either NULL or the empty string,
|
||
indicating that we should not try to read, nor write out the history. */
|
||
static bool
|
||
history_filename_empty (void)
|
||
{
|
||
return (history_filename == nullptr || *history_filename == '\0');
|
||
}
|
||
|
||
/* Implement 'show history filename'. */
|
||
static void
|
||
show_history_filename (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
if (!history_filename_empty ())
|
||
fprintf_filtered (file, _("The filename in which to record "
|
||
"the command history is \"%ps\".\n"),
|
||
styled_string (file_name_style.style (), value));
|
||
else
|
||
fprintf_filtered (file, _("There is no filename currently set for "
|
||
"recording the command history in.\n"));
|
||
}
|
||
|
||
/* This is like readline(), but it has some gdb-specific behavior.
|
||
gdb may want readline in both the synchronous and async modes during
|
||
a single gdb invocation. At the ordinary top-level prompt we might
|
||
be using the async readline. That means we can't use
|
||
rl_pre_input_hook, since it doesn't work properly in async mode.
|
||
However, for a secondary prompt (" >", such as occurs during a
|
||
`define'), gdb wants a synchronous response.
|
||
|
||
We used to call readline() directly, running it in synchronous
|
||
mode. But mixing modes this way is not supported, and as of
|
||
readline 5.x it no longer works; the arrow keys come unbound during
|
||
the synchronous call. So we make a nested call into the event
|
||
loop. That's what gdb_readline_wrapper is for. */
|
||
|
||
/* A flag set as soon as gdb_readline_wrapper_line is called; we can't
|
||
rely on gdb_readline_wrapper_result, which might still be NULL if
|
||
the user types Control-D for EOF. */
|
||
static int gdb_readline_wrapper_done;
|
||
|
||
/* The result of the current call to gdb_readline_wrapper, once a newline
|
||
is seen. */
|
||
static char *gdb_readline_wrapper_result;
|
||
|
||
/* Any intercepted hook. Operate-and-get-next sets this, expecting it
|
||
to be called after the newline is processed (which will redisplay
|
||
the prompt). But in gdb_readline_wrapper we will not get a new
|
||
prompt until the next call, or until we return to the event loop.
|
||
So we disable this hook around the newline and restore it before we
|
||
return. */
|
||
static void (*saved_after_char_processing_hook) (void);
|
||
|
||
|
||
/* See top.h. */
|
||
|
||
int
|
||
gdb_in_secondary_prompt_p (struct ui *ui)
|
||
{
|
||
return ui->secondary_prompt_depth > 0;
|
||
}
|
||
|
||
|
||
/* This function is called when readline has seen a complete line of
|
||
text. */
|
||
|
||
static void
|
||
gdb_readline_wrapper_line (gdb::unique_xmalloc_ptr<char> &&line)
|
||
{
|
||
gdb_assert (!gdb_readline_wrapper_done);
|
||
gdb_readline_wrapper_result = line.release ();
|
||
gdb_readline_wrapper_done = 1;
|
||
|
||
/* Prevent operate-and-get-next from acting too early. */
|
||
saved_after_char_processing_hook = after_char_processing_hook;
|
||
after_char_processing_hook = NULL;
|
||
|
||
/* Prevent parts of the prompt from being redisplayed if annotations
|
||
are enabled, and readline's state getting out of sync. We'll
|
||
reinstall the callback handler, which puts the terminal in raw
|
||
mode (or in readline lingo, in prepped state), when we're next
|
||
ready to process user input, either in display_gdb_prompt, or if
|
||
we're handling an asynchronous target event and running in the
|
||
background, just before returning to the event loop to process
|
||
further input (or more target events). */
|
||
if (current_ui->command_editing)
|
||
gdb_rl_callback_handler_remove ();
|
||
}
|
||
|
||
class gdb_readline_wrapper_cleanup
|
||
{
|
||
public:
|
||
gdb_readline_wrapper_cleanup ()
|
||
: m_handler_orig (current_ui->input_handler),
|
||
m_already_prompted_orig (current_ui->command_editing
|
||
? rl_already_prompted : 0),
|
||
m_target_is_async_orig (target_is_async_p ()),
|
||
m_save_ui (¤t_ui)
|
||
{
|
||
current_ui->input_handler = gdb_readline_wrapper_line;
|
||
current_ui->secondary_prompt_depth++;
|
||
|
||
if (m_target_is_async_orig)
|
||
target_async (0);
|
||
}
|
||
|
||
~gdb_readline_wrapper_cleanup ()
|
||
{
|
||
struct ui *ui = current_ui;
|
||
|
||
if (ui->command_editing)
|
||
rl_already_prompted = m_already_prompted_orig;
|
||
|
||
gdb_assert (ui->input_handler == gdb_readline_wrapper_line);
|
||
ui->input_handler = m_handler_orig;
|
||
|
||
/* Don't restore our input handler in readline yet. That would make
|
||
readline prep the terminal (putting it in raw mode), while the
|
||
line we just read may trigger execution of a command that expects
|
||
the terminal in the default cooked/canonical mode, such as e.g.,
|
||
running Python's interactive online help utility. See
|
||
gdb_readline_wrapper_line for when we'll reinstall it. */
|
||
|
||
gdb_readline_wrapper_result = NULL;
|
||
gdb_readline_wrapper_done = 0;
|
||
ui->secondary_prompt_depth--;
|
||
gdb_assert (ui->secondary_prompt_depth >= 0);
|
||
|
||
after_char_processing_hook = saved_after_char_processing_hook;
|
||
saved_after_char_processing_hook = NULL;
|
||
|
||
if (m_target_is_async_orig)
|
||
target_async (1);
|
||
}
|
||
|
||
DISABLE_COPY_AND_ASSIGN (gdb_readline_wrapper_cleanup);
|
||
|
||
private:
|
||
|
||
void (*m_handler_orig) (gdb::unique_xmalloc_ptr<char> &&);
|
||
int m_already_prompted_orig;
|
||
|
||
/* Whether the target was async. */
|
||
int m_target_is_async_orig;
|
||
|
||
/* Processing events may change the current UI. */
|
||
scoped_restore_tmpl<struct ui *> m_save_ui;
|
||
};
|
||
|
||
char *
|
||
gdb_readline_wrapper (const char *prompt)
|
||
{
|
||
struct ui *ui = current_ui;
|
||
|
||
gdb_readline_wrapper_cleanup cleanup;
|
||
|
||
/* Display our prompt and prevent double prompt display. Don't pass
|
||
down a NULL prompt, since that has special meaning for
|
||
display_gdb_prompt -- it indicates a request to print the primary
|
||
prompt, while we want a secondary prompt here. */
|
||
display_gdb_prompt (prompt != NULL ? prompt : "");
|
||
if (ui->command_editing)
|
||
rl_already_prompted = 1;
|
||
|
||
if (after_char_processing_hook)
|
||
(*after_char_processing_hook) ();
|
||
gdb_assert (after_char_processing_hook == NULL);
|
||
|
||
while (gdb_do_one_event () >= 0)
|
||
if (gdb_readline_wrapper_done)
|
||
break;
|
||
|
||
return gdb_readline_wrapper_result;
|
||
}
|
||
|
||
|
||
/* The current saved history number from operate-and-get-next.
|
||
This is -1 if not valid. */
|
||
static int operate_saved_history = -1;
|
||
|
||
/* This is put on the appropriate hook and helps operate-and-get-next
|
||
do its work. */
|
||
static void
|
||
gdb_rl_operate_and_get_next_completion (void)
|
||
{
|
||
int delta = where_history () - operate_saved_history;
|
||
|
||
/* The `key' argument to rl_get_previous_history is ignored. */
|
||
rl_get_previous_history (delta, 0);
|
||
operate_saved_history = -1;
|
||
|
||
/* readline doesn't automatically update the display for us. */
|
||
rl_redisplay ();
|
||
|
||
after_char_processing_hook = NULL;
|
||
rl_pre_input_hook = NULL;
|
||
}
|
||
|
||
/* This is a gdb-local readline command handler. It accepts the
|
||
current command line (like RET does) and, if this command was taken
|
||
from the history, arranges for the next command in the history to
|
||
appear on the command line when the prompt returns.
|
||
We ignore the arguments. */
|
||
static int
|
||
gdb_rl_operate_and_get_next (int count, int key)
|
||
{
|
||
int where;
|
||
|
||
/* Use the async hook. */
|
||
after_char_processing_hook = gdb_rl_operate_and_get_next_completion;
|
||
|
||
/* Find the current line, and find the next line to use. */
|
||
where = where_history();
|
||
|
||
if ((history_is_stifled () && (history_length >= history_max_entries))
|
||
|| (where >= history_length - 1))
|
||
operate_saved_history = where;
|
||
else
|
||
operate_saved_history = where + 1;
|
||
|
||
return rl_newline (1, key);
|
||
}
|
||
|
||
/* Number of user commands executed during this session. */
|
||
|
||
static int command_count = 0;
|
||
|
||
/* Add the user command COMMAND to the input history list. */
|
||
|
||
void
|
||
gdb_add_history (const char *command)
|
||
{
|
||
command_count++;
|
||
|
||
if (history_remove_duplicates != 0)
|
||
{
|
||
int lookbehind;
|
||
int lookbehind_threshold;
|
||
|
||
/* The lookbehind threshold for finding a duplicate history entry is
|
||
bounded by command_count because we can't meaningfully delete
|
||
history entries that are already stored in the history file since
|
||
the history file is appended to. */
|
||
if (history_remove_duplicates == -1
|
||
|| history_remove_duplicates > command_count)
|
||
lookbehind_threshold = command_count;
|
||
else
|
||
lookbehind_threshold = history_remove_duplicates;
|
||
|
||
using_history ();
|
||
for (lookbehind = 0; lookbehind < lookbehind_threshold; lookbehind++)
|
||
{
|
||
HIST_ENTRY *temp = previous_history ();
|
||
|
||
if (temp == NULL)
|
||
break;
|
||
|
||
if (strcmp (temp->line, command) == 0)
|
||
{
|
||
HIST_ENTRY *prev = remove_history (where_history ());
|
||
command_count--;
|
||
free_history_entry (prev);
|
||
break;
|
||
}
|
||
}
|
||
using_history ();
|
||
}
|
||
|
||
add_history (command);
|
||
}
|
||
|
||
/* Safely append new history entries to the history file in a corruption-free
|
||
way using an intermediate local history file. */
|
||
|
||
static void
|
||
gdb_safe_append_history (void)
|
||
{
|
||
int ret, saved_errno;
|
||
|
||
std::string local_history_filename
|
||
= string_printf ("%s-gdb%ld~", history_filename, (long) getpid ());
|
||
|
||
ret = rename (history_filename, local_history_filename.c_str ());
|
||
saved_errno = errno;
|
||
if (ret < 0 && saved_errno != ENOENT)
|
||
{
|
||
warning (_("Could not rename %ps to %ps: %s"),
|
||
styled_string (file_name_style.style (), history_filename),
|
||
styled_string (file_name_style.style (),
|
||
local_history_filename.c_str ()),
|
||
safe_strerror (saved_errno));
|
||
}
|
||
else
|
||
{
|
||
if (ret < 0)
|
||
{
|
||
/* If the rename failed with ENOENT then either the global history
|
||
file never existed in the first place or another GDB process is
|
||
currently appending to it (and has thus temporarily renamed it).
|
||
Since we can't distinguish between these two cases, we have to
|
||
conservatively assume the first case and therefore must write out
|
||
(not append) our known history to our local history file and try
|
||
to move it back anyway. Otherwise a global history file would
|
||
never get created! */
|
||
gdb_assert (saved_errno == ENOENT);
|
||
write_history (local_history_filename.c_str ());
|
||
}
|
||
else
|
||
{
|
||
append_history (command_count, local_history_filename.c_str ());
|
||
if (history_is_stifled ())
|
||
history_truncate_file (local_history_filename.c_str (),
|
||
history_max_entries);
|
||
}
|
||
|
||
ret = rename (local_history_filename.c_str (), history_filename);
|
||
saved_errno = errno;
|
||
if (ret < 0 && saved_errno != EEXIST)
|
||
warning (_("Could not rename %s to %s: %s"),
|
||
local_history_filename.c_str (), history_filename,
|
||
safe_strerror (saved_errno));
|
||
}
|
||
}
|
||
|
||
/* Read one line from the command input stream `instream' into a local
|
||
static buffer. The buffer is made bigger as necessary. Returns
|
||
the address of the start of the line.
|
||
|
||
NULL is returned for end of file.
|
||
|
||
This routine either uses fancy command line editing or simple input
|
||
as the user has requested. */
|
||
|
||
const char *
|
||
command_line_input (const char *prompt_arg, const char *annotation_suffix)
|
||
{
|
||
static struct buffer cmd_line_buffer;
|
||
static int cmd_line_buffer_initialized;
|
||
struct ui *ui = current_ui;
|
||
const char *prompt = prompt_arg;
|
||
char *cmd;
|
||
int from_tty = ui->instream == ui->stdin_stream;
|
||
|
||
/* The annotation suffix must be non-NULL. */
|
||
if (annotation_suffix == NULL)
|
||
annotation_suffix = "";
|
||
|
||
if (from_tty && annotation_level > 1)
|
||
{
|
||
char *local_prompt;
|
||
|
||
local_prompt
|
||
= (char *) alloca ((prompt == NULL ? 0 : strlen (prompt))
|
||
+ strlen (annotation_suffix) + 40);
|
||
if (prompt == NULL)
|
||
local_prompt[0] = '\0';
|
||
else
|
||
strcpy (local_prompt, prompt);
|
||
strcat (local_prompt, "\n\032\032");
|
||
strcat (local_prompt, annotation_suffix);
|
||
strcat (local_prompt, "\n");
|
||
|
||
prompt = local_prompt;
|
||
}
|
||
|
||
if (!cmd_line_buffer_initialized)
|
||
{
|
||
buffer_init (&cmd_line_buffer);
|
||
cmd_line_buffer_initialized = 1;
|
||
}
|
||
|
||
/* Starting a new command line. */
|
||
cmd_line_buffer.used_size = 0;
|
||
|
||
#ifdef SIGTSTP
|
||
if (job_control)
|
||
signal (SIGTSTP, handle_sigtstp);
|
||
#endif
|
||
|
||
while (1)
|
||
{
|
||
gdb::unique_xmalloc_ptr<char> rl;
|
||
|
||
/* Make sure that all output has been output. Some machines may
|
||
let you get away with leaving out some of the gdb_flush, but
|
||
not all. */
|
||
wrap_here ("");
|
||
gdb_flush (gdb_stdout);
|
||
gdb_flush (gdb_stderr);
|
||
|
||
if (!source_file_name.empty ())
|
||
++source_line_number;
|
||
|
||
if (from_tty && annotation_level > 1)
|
||
{
|
||
puts_unfiltered ("\n\032\032pre-");
|
||
puts_unfiltered (annotation_suffix);
|
||
puts_unfiltered ("\n");
|
||
}
|
||
|
||
/* Don't use fancy stuff if not talking to stdin. */
|
||
if (deprecated_readline_hook
|
||
&& from_tty
|
||
&& input_interactive_p (current_ui))
|
||
{
|
||
rl.reset ((*deprecated_readline_hook) (prompt));
|
||
}
|
||
else if (command_editing_p
|
||
&& from_tty
|
||
&& input_interactive_p (current_ui))
|
||
{
|
||
rl.reset (gdb_readline_wrapper (prompt));
|
||
}
|
||
else
|
||
{
|
||
rl.reset (gdb_readline_no_editing (prompt));
|
||
}
|
||
|
||
cmd = handle_line_of_input (&cmd_line_buffer, rl.get (),
|
||
0, annotation_suffix);
|
||
if (cmd == (char *) EOF)
|
||
{
|
||
cmd = NULL;
|
||
break;
|
||
}
|
||
if (cmd != NULL)
|
||
break;
|
||
|
||
/* Got partial input. I.e., got a line that ends with a
|
||
continuation character (backslash). Suppress printing the
|
||
prompt again. */
|
||
prompt = NULL;
|
||
}
|
||
|
||
#ifdef SIGTSTP
|
||
if (job_control)
|
||
signal (SIGTSTP, SIG_DFL);
|
||
#endif
|
||
|
||
return cmd;
|
||
}
|
||
|
||
/* See top.h. */
|
||
void
|
||
print_gdb_version (struct ui_file *stream, bool interactive)
|
||
{
|
||
/* From GNU coding standards, first line is meant to be easy for a
|
||
program to parse, and is just canonical program name and version
|
||
number, which starts after last space. */
|
||
|
||
std::string v_str = string_printf ("GNU gdb %s%s", PKGVERSION, version);
|
||
fprintf_filtered (stream, "%ps\n",
|
||
styled_string (version_style.style (), v_str.c_str ()));
|
||
|
||
/* Second line is a copyright notice. */
|
||
|
||
fprintf_filtered (stream,
|
||
"Copyright (C) 2021 Free Software Foundation, Inc.\n");
|
||
|
||
/* Following the copyright is a brief statement that the program is
|
||
free software, that users are free to copy and change it on
|
||
certain conditions, that it is covered by the GNU GPL, and that
|
||
there is no warranty. */
|
||
|
||
fprintf_filtered (stream, "\
|
||
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\
|
||
\nThis is free software: you are free to change and redistribute it.\n\
|
||
There is NO WARRANTY, to the extent permitted by law.");
|
||
|
||
if (!interactive)
|
||
return;
|
||
|
||
fprintf_filtered (stream, ("\nType \"show copying\" and "
|
||
"\"show warranty\" for details.\n"));
|
||
|
||
/* After the required info we print the configuration information. */
|
||
|
||
fprintf_filtered (stream, "This GDB was configured as \"");
|
||
if (strcmp (host_name, target_name) != 0)
|
||
{
|
||
fprintf_filtered (stream, "--host=%s --target=%s",
|
||
host_name, target_name);
|
||
}
|
||
else
|
||
{
|
||
fprintf_filtered (stream, "%s", host_name);
|
||
}
|
||
fprintf_filtered (stream, "\".\n");
|
||
|
||
fprintf_filtered (stream, _("Type \"show configuration\" "
|
||
"for configuration details.\n"));
|
||
|
||
if (REPORT_BUGS_TO[0])
|
||
{
|
||
fprintf_filtered (stream,
|
||
_("For bug reporting instructions, please see:\n"));
|
||
fprintf_filtered (stream, "%s.\n", REPORT_BUGS_TO);
|
||
}
|
||
fprintf_filtered (stream,
|
||
_("Find the GDB manual and other documentation \
|
||
resources online at:\n <http://www.gnu.org/software/gdb/documentation/>."));
|
||
fprintf_filtered (stream, "\n\n");
|
||
fprintf_filtered (stream, _("For help, type \"help\".\n"));
|
||
fprintf_filtered (stream,
|
||
_("Type \"apropos word\" to search for commands \
|
||
related to \"word\"."));
|
||
}
|
||
|
||
/* Print the details of GDB build-time configuration. */
|
||
void
|
||
print_gdb_configuration (struct ui_file *stream)
|
||
{
|
||
fprintf_filtered (stream, _("\
|
||
This GDB was configured as follows:\n\
|
||
configure --host=%s --target=%s\n\
|
||
"), host_name, target_name);
|
||
|
||
fprintf_filtered (stream, _("\
|
||
--with-auto-load-dir=%s\n\
|
||
--with-auto-load-safe-path=%s\n\
|
||
"), AUTO_LOAD_DIR, AUTO_LOAD_SAFE_PATH);
|
||
|
||
#if HAVE_LIBEXPAT
|
||
fprintf_filtered (stream, _("\
|
||
--with-expat\n\
|
||
"));
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-expat\n\
|
||
"));
|
||
#endif
|
||
|
||
if (GDB_DATADIR[0])
|
||
fprintf_filtered (stream, _("\
|
||
--with-gdb-datadir=%s%s\n\
|
||
"), GDB_DATADIR, GDB_DATADIR_RELOCATABLE ? " (relocatable)" : "");
|
||
|
||
#ifdef ICONV_BIN
|
||
fprintf_filtered (stream, _("\
|
||
--with-iconv-bin=%s%s\n\
|
||
"), ICONV_BIN, ICONV_BIN_RELOCATABLE ? " (relocatable)" : "");
|
||
#endif
|
||
|
||
if (JIT_READER_DIR[0])
|
||
fprintf_filtered (stream, _("\
|
||
--with-jit-reader-dir=%s%s\n\
|
||
"), JIT_READER_DIR, JIT_READER_DIR_RELOCATABLE ? " (relocatable)" : "");
|
||
|
||
#if HAVE_LIBUNWIND_IA64_H
|
||
fprintf_filtered (stream, _("\
|
||
--with-libunwind-ia64\n\
|
||
"));
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-libunwind-ia64\n\
|
||
"));
|
||
#endif
|
||
|
||
#if HAVE_LIBLZMA
|
||
fprintf_filtered (stream, _("\
|
||
--with-lzma\n\
|
||
"));
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-lzma\n\
|
||
"));
|
||
#endif
|
||
|
||
#if HAVE_LIBBABELTRACE
|
||
fprintf_filtered (stream, _("\
|
||
--with-babeltrace\n\
|
||
"));
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-babeltrace\n\
|
||
"));
|
||
#endif
|
||
|
||
#if HAVE_LIBIPT
|
||
fprintf_filtered (stream, _("\
|
||
--with-intel-pt\n\
|
||
"));
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-intel-pt\n\
|
||
"));
|
||
#endif
|
||
|
||
#if HAVE_LIBMPFR
|
||
fprintf_filtered (stream, _("\
|
||
--with-mpfr\n\
|
||
"));
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-mpfr\n\
|
||
"));
|
||
#endif
|
||
#if HAVE_LIBXXHASH
|
||
fprintf_filtered (stream, _("\
|
||
--with-xxhash\n\
|
||
"));
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-xxhash\n\
|
||
"));
|
||
#endif
|
||
#ifdef WITH_PYTHON_PATH
|
||
fprintf_filtered (stream, _("\
|
||
--with-python=%s%s\n\
|
||
"), WITH_PYTHON_PATH, PYTHON_PATH_RELOCATABLE ? " (relocatable)" : "");
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-python\n\
|
||
"));
|
||
#endif
|
||
#ifdef WITH_PYTHON_LIBDIR
|
||
fprintf_filtered (stream, _("\
|
||
--with-python-libdir=%s%s\n\
|
||
"), WITH_PYTHON_LIBDIR, PYTHON_LIBDIR_RELOCATABLE ? " (relocatable)" : "");
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-python-libdir\n\
|
||
"));
|
||
#endif
|
||
|
||
#if HAVE_LIBDEBUGINFOD
|
||
fprintf_filtered (stream, _("\
|
||
--with-debuginfod\n\
|
||
"));
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-debuginfod\n\
|
||
"));
|
||
#endif
|
||
|
||
#if HAVE_GUILE
|
||
fprintf_filtered (stream, _("\
|
||
--with-guile\n\
|
||
"));
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--without-guile\n\
|
||
"));
|
||
#endif
|
||
|
||
#if HAVE_SOURCE_HIGHLIGHT
|
||
fprintf_filtered (stream, _("\
|
||
--enable-source-highlight\n\
|
||
"));
|
||
#else
|
||
fprintf_filtered (stream, _("\
|
||
--disable-source-highlight\n\
|
||
"));
|
||
#endif
|
||
|
||
#ifdef RELOC_SRCDIR
|
||
fprintf_filtered (stream, _("\
|
||
--with-relocated-sources=%s\n\
|
||
"), RELOC_SRCDIR);
|
||
#endif
|
||
|
||
if (DEBUGDIR[0])
|
||
fprintf_filtered (stream, _("\
|
||
--with-separate-debug-dir=%s%s\n\
|
||
"), DEBUGDIR, DEBUGDIR_RELOCATABLE ? " (relocatable)" : "");
|
||
|
||
if (TARGET_SYSTEM_ROOT[0])
|
||
fprintf_filtered (stream, _("\
|
||
--with-sysroot=%s%s\n\
|
||
"), TARGET_SYSTEM_ROOT, TARGET_SYSTEM_ROOT_RELOCATABLE ? " (relocatable)" : "");
|
||
|
||
if (SYSTEM_GDBINIT[0])
|
||
fprintf_filtered (stream, _("\
|
||
--with-system-gdbinit=%s%s\n\
|
||
"), SYSTEM_GDBINIT, SYSTEM_GDBINIT_RELOCATABLE ? " (relocatable)" : "");
|
||
|
||
if (SYSTEM_GDBINIT_DIR[0])
|
||
fprintf_filtered (stream, _("\
|
||
--with-system-gdbinit-dir=%s%s\n\
|
||
"), SYSTEM_GDBINIT_DIR, SYSTEM_GDBINIT_DIR_RELOCATABLE ? " (relocatable)" : "");
|
||
|
||
/* We assume "relocatable" will be printed at least once, thus we always
|
||
print this text. It's a reasonably safe assumption for now. */
|
||
fprintf_filtered (stream, _("\n\
|
||
(\"Relocatable\" means the directory can be moved with the GDB installation\n\
|
||
tree, and GDB will still find it.)\n\
|
||
"));
|
||
}
|
||
|
||
|
||
/* The current top level prompt, settable with "set prompt", and/or
|
||
with the python `gdb.prompt_hook' hook. */
|
||
static char *top_prompt;
|
||
|
||
/* Access method for the GDB prompt string. */
|
||
|
||
char *
|
||
get_prompt (void)
|
||
{
|
||
return top_prompt;
|
||
}
|
||
|
||
/* Set method for the GDB prompt string. */
|
||
|
||
void
|
||
set_prompt (const char *s)
|
||
{
|
||
char *p = xstrdup (s);
|
||
|
||
xfree (top_prompt);
|
||
top_prompt = p;
|
||
}
|
||
|
||
|
||
/* Kills or detaches the given inferior, depending on how we originally
|
||
gained control of it. */
|
||
|
||
static void
|
||
kill_or_detach (inferior *inf, int from_tty)
|
||
{
|
||
if (inf->pid == 0)
|
||
return;
|
||
|
||
thread_info *thread = any_thread_of_inferior (inf);
|
||
if (thread != NULL)
|
||
{
|
||
switch_to_thread (thread);
|
||
|
||
/* Leave core files alone. */
|
||
if (target_has_execution ())
|
||
{
|
||
if (inf->attach_flag)
|
||
target_detach (inf, from_tty);
|
||
else
|
||
target_kill ();
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Prints info about what GDB will do to inferior INF on a "quit". OUT is
|
||
where to collect the output. */
|
||
|
||
static void
|
||
print_inferior_quit_action (inferior *inf, ui_file *out)
|
||
{
|
||
if (inf->pid == 0)
|
||
return;
|
||
|
||
if (inf->attach_flag)
|
||
fprintf_filtered (out,
|
||
_("\tInferior %d [%s] will be detached.\n"), inf->num,
|
||
target_pid_to_str (ptid_t (inf->pid)).c_str ());
|
||
else
|
||
fprintf_filtered (out,
|
||
_("\tInferior %d [%s] will be killed.\n"), inf->num,
|
||
target_pid_to_str (ptid_t (inf->pid)).c_str ());
|
||
}
|
||
|
||
/* If necessary, make the user confirm that we should quit. Return
|
||
non-zero if we should quit, zero if we shouldn't. */
|
||
|
||
int
|
||
quit_confirm (void)
|
||
{
|
||
/* Don't even ask if we're only debugging a core file inferior. */
|
||
if (!have_live_inferiors ())
|
||
return 1;
|
||
|
||
/* Build the query string as a single string. */
|
||
string_file stb;
|
||
|
||
stb.puts (_("A debugging session is active.\n\n"));
|
||
|
||
for (inferior *inf : all_inferiors ())
|
||
print_inferior_quit_action (inf, &stb);
|
||
|
||
stb.puts (_("\nQuit anyway? "));
|
||
|
||
return query ("%s", stb.c_str ());
|
||
}
|
||
|
||
/* Prepare to exit GDB cleanly by undoing any changes made to the
|
||
terminal so that we leave the terminal in the state we acquired it. */
|
||
|
||
static void
|
||
undo_terminal_modifications_before_exit (void)
|
||
{
|
||
struct ui *saved_top_level = current_ui;
|
||
|
||
target_terminal::ours ();
|
||
|
||
current_ui = main_ui;
|
||
|
||
#if defined(TUI)
|
||
tui_disable ();
|
||
#endif
|
||
gdb_disable_readline ();
|
||
|
||
current_ui = saved_top_level;
|
||
}
|
||
|
||
|
||
/* Quit without asking for confirmation. */
|
||
|
||
void
|
||
quit_force (int *exit_arg, int from_tty)
|
||
{
|
||
int exit_code = 0;
|
||
|
||
undo_terminal_modifications_before_exit ();
|
||
|
||
/* An optional expression may be used to cause gdb to terminate with the
|
||
value of that expression. */
|
||
if (exit_arg)
|
||
exit_code = *exit_arg;
|
||
else if (return_child_result)
|
||
exit_code = return_child_result_value;
|
||
|
||
/* We want to handle any quit errors and exit regardless. */
|
||
|
||
/* Get out of tfind mode, and kill or detach all inferiors. */
|
||
try
|
||
{
|
||
disconnect_tracing ();
|
||
for (inferior *inf : all_inferiors ())
|
||
kill_or_detach (inf, from_tty);
|
||
}
|
||
catch (const gdb_exception &ex)
|
||
{
|
||
exception_print (gdb_stderr, ex);
|
||
}
|
||
|
||
/* Give all pushed targets a chance to do minimal cleanup, and pop
|
||
them all out. */
|
||
for (inferior *inf : all_inferiors ())
|
||
{
|
||
switch_to_inferior_no_thread (inf);
|
||
try
|
||
{
|
||
pop_all_targets ();
|
||
}
|
||
catch (const gdb_exception &ex)
|
||
{
|
||
exception_print (gdb_stderr, ex);
|
||
}
|
||
}
|
||
|
||
/* Save the history information if it is appropriate to do so. */
|
||
try
|
||
{
|
||
if (write_history_p && history_filename)
|
||
{
|
||
int save = 0;
|
||
|
||
/* History is currently shared between all UIs. If there's
|
||
any UI with a terminal, save history. */
|
||
for (ui *ui : all_uis ())
|
||
{
|
||
if (input_interactive_p (ui))
|
||
{
|
||
save = 1;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (save)
|
||
gdb_safe_append_history ();
|
||
}
|
||
}
|
||
catch (const gdb_exception &ex)
|
||
{
|
||
exception_print (gdb_stderr, ex);
|
||
}
|
||
|
||
/* Destroy any values currently allocated now instead of leaving it
|
||
to global destructors, because that may be too late. For
|
||
example, the destructors of xmethod values call into the Python
|
||
runtime, which is finalized via a final cleanup. */
|
||
finalize_values ();
|
||
|
||
/* Do any final cleanups before exiting. */
|
||
try
|
||
{
|
||
do_final_cleanups ();
|
||
}
|
||
catch (const gdb_exception &ex)
|
||
{
|
||
exception_print (gdb_stderr, ex);
|
||
}
|
||
|
||
exit (exit_code);
|
||
}
|
||
|
||
/* The value of the "interactive-mode" setting. */
|
||
static enum auto_boolean interactive_mode = AUTO_BOOLEAN_AUTO;
|
||
|
||
/* Implement the "show interactive-mode" option. */
|
||
|
||
static void
|
||
show_interactive_mode (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c,
|
||
const char *value)
|
||
{
|
||
if (interactive_mode == AUTO_BOOLEAN_AUTO)
|
||
fprintf_filtered (file, "Debugger's interactive mode "
|
||
"is %s (currently %s).\n",
|
||
value, input_interactive_p (current_ui) ? "on" : "off");
|
||
else
|
||
fprintf_filtered (file, "Debugger's interactive mode is %s.\n", value);
|
||
}
|
||
|
||
/* Returns whether GDB is running on an interactive terminal. */
|
||
|
||
int
|
||
input_interactive_p (struct ui *ui)
|
||
{
|
||
if (batch_flag)
|
||
return 0;
|
||
|
||
if (interactive_mode != AUTO_BOOLEAN_AUTO)
|
||
return interactive_mode == AUTO_BOOLEAN_TRUE;
|
||
|
||
return ui->input_interactive_p;
|
||
}
|
||
|
||
static void
|
||
dont_repeat_command (const char *ignored, int from_tty)
|
||
{
|
||
/* Can't call dont_repeat here because we're not necessarily reading
|
||
from stdin. */
|
||
*saved_command_line = 0;
|
||
}
|
||
|
||
/* Functions to manipulate command line editing control variables. */
|
||
|
||
/* Number of commands to print in each call to show_commands. */
|
||
#define Hist_print 10
|
||
void
|
||
show_commands (const char *args, int from_tty)
|
||
{
|
||
/* Index for history commands. Relative to history_base. */
|
||
int offset;
|
||
|
||
/* Number of the history entry which we are planning to display next.
|
||
Relative to history_base. */
|
||
static int num = 0;
|
||
|
||
/* Print out some of the commands from the command history. */
|
||
|
||
if (args)
|
||
{
|
||
if (args[0] == '+' && args[1] == '\0')
|
||
/* "info editing +" should print from the stored position. */
|
||
;
|
||
else
|
||
/* "info editing <exp>" should print around command number <exp>. */
|
||
num = (parse_and_eval_long (args) - history_base) - Hist_print / 2;
|
||
}
|
||
/* "show commands" means print the last Hist_print commands. */
|
||
else
|
||
{
|
||
num = history_length - Hist_print;
|
||
}
|
||
|
||
if (num < 0)
|
||
num = 0;
|
||
|
||
/* If there are at least Hist_print commands, we want to display the last
|
||
Hist_print rather than, say, the last 6. */
|
||
if (history_length - num < Hist_print)
|
||
{
|
||
num = history_length - Hist_print;
|
||
if (num < 0)
|
||
num = 0;
|
||
}
|
||
|
||
for (offset = num;
|
||
offset < num + Hist_print && offset < history_length;
|
||
offset++)
|
||
{
|
||
printf_filtered ("%5d %s\n", history_base + offset,
|
||
(history_get (history_base + offset))->line);
|
||
}
|
||
|
||
/* The next command we want to display is the next one that we haven't
|
||
displayed yet. */
|
||
num += Hist_print;
|
||
|
||
/* If the user repeats this command with return, it should do what
|
||
"show commands +" does. This is unnecessary if arg is null,
|
||
because "show commands +" is not useful after "show commands". */
|
||
if (from_tty && args)
|
||
set_repeat_arguments ("+");
|
||
}
|
||
|
||
/* Update the size of our command history file to HISTORY_SIZE.
|
||
|
||
A HISTORY_SIZE of -1 stands for unlimited. */
|
||
|
||
static void
|
||
set_readline_history_size (int history_size)
|
||
{
|
||
gdb_assert (history_size >= -1);
|
||
|
||
if (history_size == -1)
|
||
unstifle_history ();
|
||
else
|
||
stifle_history (history_size);
|
||
}
|
||
|
||
/* Called by do_setshow_command. */
|
||
static void
|
||
set_history_size_command (const char *args,
|
||
int from_tty, struct cmd_list_element *c)
|
||
{
|
||
set_readline_history_size (history_size_setshow_var);
|
||
}
|
||
|
||
bool info_verbose = false; /* Default verbose msgs off. */
|
||
|
||
/* Called by do_set_command. An elaborate joke. */
|
||
void
|
||
set_verbose (const char *args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
const char *cmdname = "verbose";
|
||
struct cmd_list_element *showcmd;
|
||
|
||
showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, NULL, 1);
|
||
gdb_assert (showcmd != NULL && showcmd != CMD_LIST_AMBIGUOUS);
|
||
|
||
if (c->doc && c->doc_allocated)
|
||
xfree ((char *) c->doc);
|
||
if (showcmd->doc && showcmd->doc_allocated)
|
||
xfree ((char *) showcmd->doc);
|
||
if (info_verbose)
|
||
{
|
||
c->doc = _("Set verbose printing of informational messages.");
|
||
showcmd->doc = _("Show verbose printing of informational messages.");
|
||
}
|
||
else
|
||
{
|
||
c->doc = _("Set verbosity.");
|
||
showcmd->doc = _("Show verbosity.");
|
||
}
|
||
c->doc_allocated = 0;
|
||
showcmd->doc_allocated = 0;
|
||
}
|
||
|
||
/* Init the history buffer. Note that we are called after the init file(s)
|
||
have been read so that the user can change the history file via his
|
||
.gdbinit file (for instance). The GDBHISTFILE environment variable
|
||
overrides all of this. */
|
||
|
||
void
|
||
init_history (void)
|
||
{
|
||
const char *tmpenv;
|
||
|
||
tmpenv = getenv ("GDBHISTSIZE");
|
||
if (tmpenv)
|
||
{
|
||
long var;
|
||
int saved_errno;
|
||
char *endptr;
|
||
|
||
tmpenv = skip_spaces (tmpenv);
|
||
errno = 0;
|
||
var = strtol (tmpenv, &endptr, 10);
|
||
saved_errno = errno;
|
||
endptr = skip_spaces (endptr);
|
||
|
||
/* If GDBHISTSIZE is non-numeric then ignore it. If GDBHISTSIZE is the
|
||
empty string, a negative number or a huge positive number (larger than
|
||
INT_MAX) then set the history size to unlimited. Otherwise set our
|
||
history size to the number we have read. This behavior is consistent
|
||
with how bash handles HISTSIZE. */
|
||
if (*endptr != '\0')
|
||
;
|
||
else if (*tmpenv == '\0'
|
||
|| var < 0
|
||
|| var > INT_MAX
|
||
/* On targets where INT_MAX == LONG_MAX, we have to look at
|
||
errno after calling strtol to distinguish between a value that
|
||
is exactly INT_MAX and an overflowing value that was clamped
|
||
to INT_MAX. */
|
||
|| (var == INT_MAX && saved_errno == ERANGE))
|
||
history_size_setshow_var = -1;
|
||
else
|
||
history_size_setshow_var = var;
|
||
}
|
||
|
||
/* If neither the init file nor GDBHISTSIZE has set a size yet, pick the
|
||
default. */
|
||
if (history_size_setshow_var == -2)
|
||
history_size_setshow_var = 256;
|
||
|
||
set_readline_history_size (history_size_setshow_var);
|
||
|
||
tmpenv = getenv ("GDBHISTFILE");
|
||
if (tmpenv != nullptr)
|
||
history_filename = xstrdup (tmpenv);
|
||
else if (history_filename == nullptr)
|
||
{
|
||
/* We include the current directory so that if the user changes
|
||
directories the file written will be the same as the one
|
||
that was read. */
|
||
#ifdef __MSDOS__
|
||
/* No leading dots in file names are allowed on MSDOS. */
|
||
const char *fname = "_gdb_history";
|
||
#else
|
||
const char *fname = ".gdb_history";
|
||
#endif
|
||
|
||
gdb::unique_xmalloc_ptr<char> temp (gdb_abspath (fname));
|
||
history_filename = temp.release ();
|
||
}
|
||
|
||
if (!history_filename_empty ())
|
||
read_history (history_filename);
|
||
}
|
||
|
||
static void
|
||
show_prompt (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Gdb's prompt is \"%s\".\n"), value);
|
||
}
|
||
|
||
/* "set editing" command. */
|
||
|
||
static void
|
||
set_editing (const char *args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
change_line_handler (set_editing_cmd_var);
|
||
/* Update the control variable so that MI's =cmd-param-changed event
|
||
shows the correct value. */
|
||
set_editing_cmd_var = current_ui->command_editing;
|
||
}
|
||
|
||
static void
|
||
show_editing (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Editing of command lines as "
|
||
"they are typed is %s.\n"),
|
||
current_ui->command_editing ? _("on") : _("off"));
|
||
}
|
||
|
||
static void
|
||
show_annotation_level (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Annotation_level is %s.\n"), value);
|
||
}
|
||
|
||
static void
|
||
show_exec_done_display_p (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Notification of completion for "
|
||
"asynchronous execution commands is %s.\n"),
|
||
value);
|
||
}
|
||
|
||
/* New values of the "data-directory" parameter are staged here. */
|
||
static char *staged_gdb_datadir;
|
||
|
||
/* "set" command for the gdb_datadir configuration variable. */
|
||
|
||
static void
|
||
set_gdb_datadir (const char *args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
set_gdb_data_directory (staged_gdb_datadir);
|
||
gdb::observers::gdb_datadir_changed.notify ();
|
||
}
|
||
|
||
/* "show" command for the gdb_datadir configuration variable. */
|
||
|
||
static void
|
||
show_gdb_datadir (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("GDB's data directory is \"%ps\".\n"),
|
||
styled_string (file_name_style.style (),
|
||
gdb_datadir.c_str ()));
|
||
}
|
||
|
||
/* Implement 'set history filename'. */
|
||
|
||
static void
|
||
set_history_filename (const char *args,
|
||
int from_tty, struct cmd_list_element *c)
|
||
{
|
||
/* We include the current directory so that if the user changes
|
||
directories the file written will be the same as the one
|
||
that was read. */
|
||
if (!history_filename_empty () && !IS_ABSOLUTE_PATH (history_filename))
|
||
{
|
||
gdb::unique_xmalloc_ptr<char> temp (gdb_abspath (history_filename));
|
||
|
||
xfree (history_filename);
|
||
history_filename = temp.release ();
|
||
}
|
||
}
|
||
|
||
static void
|
||
init_gdb_version_vars (void)
|
||
{
|
||
struct internalvar *major_version_var = create_internalvar ("_gdb_major");
|
||
struct internalvar *minor_version_var = create_internalvar ("_gdb_minor");
|
||
int vmajor = 0, vminor = 0, vrevision = 0;
|
||
sscanf (version, "%d.%d.%d", &vmajor, &vminor, &vrevision);
|
||
set_internalvar_integer (major_version_var, vmajor);
|
||
set_internalvar_integer (minor_version_var, vminor + (vrevision > 0));
|
||
}
|
||
|
||
static void
|
||
init_main (void)
|
||
{
|
||
struct cmd_list_element *c;
|
||
|
||
/* Initialize the prompt to a simple "(gdb) " prompt or to whatever
|
||
the DEFAULT_PROMPT is. */
|
||
set_prompt (DEFAULT_PROMPT);
|
||
|
||
/* Set the important stuff up for command editing. */
|
||
command_editing_p = 1;
|
||
history_expansion_p = 0;
|
||
write_history_p = 0;
|
||
|
||
/* Setup important stuff for command line editing. */
|
||
rl_completion_word_break_hook = gdb_completion_word_break_characters;
|
||
rl_attempted_completion_function = gdb_rl_attempted_completion_function;
|
||
set_rl_completer_word_break_characters (default_word_break_characters ());
|
||
rl_completer_quote_characters = get_gdb_completer_quote_characters ();
|
||
rl_completion_display_matches_hook = cli_display_match_list;
|
||
rl_readline_name = "gdb";
|
||
rl_terminal_name = getenv ("TERM");
|
||
|
||
/* The name for this defun comes from Bash, where it originated.
|
||
15 is Control-o, the same binding this function has in Bash. */
|
||
rl_add_defun ("operate-and-get-next", gdb_rl_operate_and_get_next, 15);
|
||
|
||
add_setshow_string_cmd ("prompt", class_support,
|
||
&top_prompt,
|
||
_("Set gdb's prompt."),
|
||
_("Show gdb's prompt."),
|
||
NULL, NULL,
|
||
show_prompt,
|
||
&setlist, &showlist);
|
||
|
||
add_com ("dont-repeat", class_support, dont_repeat_command, _("\
|
||
Don't repeat this command.\nPrimarily \
|
||
used inside of user-defined commands that should not be repeated when\n\
|
||
hitting return."));
|
||
|
||
add_setshow_boolean_cmd ("editing", class_support,
|
||
&set_editing_cmd_var, _("\
|
||
Set editing of command lines as they are typed."), _("\
|
||
Show editing of command lines as they are typed."), _("\
|
||
Use \"on\" to enable the editing, and \"off\" to disable it.\n\
|
||
Without an argument, command line editing is enabled. To edit, use\n\
|
||
EMACS-like or VI-like commands like control-P or ESC."),
|
||
set_editing,
|
||
show_editing,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_boolean_cmd ("save", no_class, &write_history_p, _("\
|
||
Set saving of the history record on exit."), _("\
|
||
Show saving of the history record on exit."), _("\
|
||
Use \"on\" to enable the saving, and \"off\" to disable it.\n\
|
||
Without an argument, saving is enabled."),
|
||
NULL,
|
||
show_write_history_p,
|
||
&sethistlist, &showhistlist);
|
||
|
||
add_setshow_zuinteger_unlimited_cmd ("size", no_class,
|
||
&history_size_setshow_var, _("\
|
||
Set the size of the command history."), _("\
|
||
Show the size of the command history."), _("\
|
||
This is the number of previous commands to keep a record of.\n\
|
||
If set to \"unlimited\", the number of commands kept in the history\n\
|
||
list is unlimited. This defaults to the value of the environment\n\
|
||
variable \"GDBHISTSIZE\", or to 256 if this variable is not set."),
|
||
set_history_size_command,
|
||
show_history_size,
|
||
&sethistlist, &showhistlist);
|
||
|
||
add_setshow_zuinteger_unlimited_cmd ("remove-duplicates", no_class,
|
||
&history_remove_duplicates, _("\
|
||
Set how far back in history to look for and remove duplicate entries."), _("\
|
||
Show how far back in history to look for and remove duplicate entries."), _("\
|
||
If set to a nonzero value N, GDB will look back at the last N history entries\n\
|
||
and remove the first history entry that is a duplicate of the most recent\n\
|
||
entry, each time a new history entry is added.\n\
|
||
If set to \"unlimited\", this lookbehind is unbounded.\n\
|
||
Only history entries added during this session are considered for removal.\n\
|
||
If set to 0, removal of duplicate history entries is disabled.\n\
|
||
By default this option is set to 0."),
|
||
NULL,
|
||
show_history_remove_duplicates,
|
||
&sethistlist, &showhistlist);
|
||
|
||
add_setshow_optional_filename_cmd ("filename", no_class, &history_filename, _("\
|
||
Set the filename in which to record the command history."), _("\
|
||
Show the filename in which to record the command history."), _("\
|
||
(the list of previous commands of which a record is kept)."),
|
||
set_history_filename,
|
||
show_history_filename,
|
||
&sethistlist, &showhistlist);
|
||
|
||
add_setshow_boolean_cmd ("confirm", class_support, &confirm, _("\
|
||
Set whether to confirm potentially dangerous operations."), _("\
|
||
Show whether to confirm potentially dangerous operations."), NULL,
|
||
NULL,
|
||
show_confirm,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_zinteger_cmd ("annotate", class_obscure, &annotation_level, _("\
|
||
Set annotation_level."), _("\
|
||
Show annotation_level."), _("\
|
||
0 == normal; 1 == fullname (for use when running under emacs)\n\
|
||
2 == output annotated suitably for use by programs that control GDB."),
|
||
NULL,
|
||
show_annotation_level,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_boolean_cmd ("exec-done-display", class_support,
|
||
&exec_done_display_p, _("\
|
||
Set notification of completion for asynchronous execution commands."), _("\
|
||
Show notification of completion for asynchronous execution commands."), _("\
|
||
Use \"on\" to enable the notification, and \"off\" to disable it."),
|
||
NULL,
|
||
show_exec_done_display_p,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_filename_cmd ("data-directory", class_maintenance,
|
||
&staged_gdb_datadir, _("Set GDB's data directory."),
|
||
_("Show GDB's data directory."),
|
||
_("\
|
||
When set, GDB uses the specified path to search for data files."),
|
||
set_gdb_datadir, show_gdb_datadir,
|
||
&setlist,
|
||
&showlist);
|
||
|
||
add_setshow_auto_boolean_cmd ("interactive-mode", class_support,
|
||
&interactive_mode, _("\
|
||
Set whether GDB's standard input is a terminal."), _("\
|
||
Show whether GDB's standard input is a terminal."), _("\
|
||
If on, GDB assumes that standard input is a terminal. In practice, it\n\
|
||
means that GDB should wait for the user to answer queries associated to\n\
|
||
commands entered at the command prompt. If off, GDB assumes that standard\n\
|
||
input is not a terminal, and uses the default answer to all queries.\n\
|
||
If auto (the default), determine which mode to use based on the standard\n\
|
||
input settings."),
|
||
NULL,
|
||
show_interactive_mode,
|
||
&setlist, &showlist);
|
||
|
||
c = add_cmd ("new-ui", class_support, new_ui_command, _("\
|
||
Create a new UI.\n\
|
||
Usage: new-ui INTERPRETER TTY\n\
|
||
The first argument is the name of the interpreter to run.\n\
|
||
The second argument is the terminal the UI runs on."), &cmdlist);
|
||
set_cmd_completer (c, interpreter_completer);
|
||
}
|
||
|
||
void
|
||
gdb_init (char *argv0)
|
||
{
|
||
saved_command_line = xstrdup ("");
|
||
previous_saved_command_line = xstrdup ("");
|
||
|
||
/* Run the init function of each source file. */
|
||
|
||
#ifdef __MSDOS__
|
||
/* Make sure we return to the original directory upon exit, come
|
||
what may, since the OS doesn't do that for us. */
|
||
make_final_cleanup (do_chdir_cleanup, xstrdup (current_directory));
|
||
#endif
|
||
|
||
init_cmd_lists (); /* This needs to be done first. */
|
||
|
||
init_page_info ();
|
||
|
||
/* Here is where we call all the _initialize_foo routines. */
|
||
initialize_all_files ();
|
||
|
||
/* This creates the current_program_space. Do this after all the
|
||
_initialize_foo routines have had a chance to install their
|
||
per-sspace data keys. Also do this before
|
||
initialize_current_architecture is called, because it accesses
|
||
exec_bfd of the current program space. */
|
||
initialize_progspace ();
|
||
initialize_inferiors ();
|
||
initialize_current_architecture ();
|
||
init_main (); /* But that omits this file! Do it now. */
|
||
|
||
initialize_stdin_serial ();
|
||
|
||
/* Take a snapshot of our tty state before readline/ncurses have had a chance
|
||
to alter it. */
|
||
set_initial_gdb_ttystate ();
|
||
|
||
async_init_signals ();
|
||
|
||
/* We need a default language for parsing expressions, so simple
|
||
things like "set width 0" won't fail if no language is explicitly
|
||
set in a config file or implicitly set by reading an executable
|
||
during startup. */
|
||
set_language (language_c);
|
||
expected_language = current_language; /* Don't warn about the change. */
|
||
|
||
/* Python initialization, for example, can require various commands to be
|
||
installed. For example "info pretty-printer" needs the "info"
|
||
prefix to be installed. Keep things simple and just do final
|
||
script initialization here. */
|
||
finish_ext_lang_initialization ();
|
||
|
||
/* Create $_gdb_major and $_gdb_minor convenience variables. */
|
||
init_gdb_version_vars ();
|
||
}
|