/* Top level stuff for GDB, the GNU debugger.
- Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2007, 2008, 2009, 2010,
- 2011 Free Software Foundation, Inc.
+ Copyright (C) 1999-2014 Free Software Foundation, Inc.
Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
#include "defs.h"
#include "top.h"
#include "inferior.h"
+#include "infrun.h"
#include "target.h"
#include "terminal.h" /* for job_control */
#include "event-loop.h"
#include "event-top.h"
#include "interps.h"
#include <signal.h>
-#include "exceptions.h"
#include "cli/cli-script.h" /* for reset_command_nest_depth */
#include "main.h"
#include "gdbthread.h"
#include "observer.h"
#include "continuations.h"
#include "gdbcmd.h" /* for dont_repeat() */
+#include "annotate.h"
+#include "maint.h"
/* readline include files. */
#include "readline/readline.h"
static void rl_callback_read_char_wrapper (gdb_client_data client_data);
static void command_line_handler (char *rl);
static void change_line_handler (void);
-static void change_annotation_level (void);
static void command_handler (char *command);
+static char *top_level_prompt (void);
/* Signal handlers. */
#ifdef SIGQUIT
static void handle_sighup (int sig);
#endif
static void handle_sigfpe (int sig);
-#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
-static void handle_sigwinch (int sig);
-#endif
/* Functions to be invoked by the event loop in response to
signals. */
#ifdef STOP_SIGNAL
static void async_stop_sig (gdb_client_data);
#endif
+static void async_sigterm_handler (gdb_client_data arg);
/* Readline offers an alternate interface, via callback
functions. These are all included in the file callback.c in the
loop as default engine, and event-top.c is merged into top.c. */
int async_command_editing_p;
-/* This variable contains the new prompt that the user sets with the
- set prompt command. */
-char *new_async_prompt;
-
/* This is the annotation suffix that will be used when the
annotation_level is 2. */
char *async_annotation_suffix;
read commands from. */
int input_fd;
-/* This is the prompt stack. Prompts will be pushed on the stack as
- needed by the different 'kinds' of user inputs GDB is asking
- for. See event-loop.h. */
-struct prompts the_prompts;
-
/* Signal handling variables. */
/* Each of these is a pointer to a function that the event loop will
invoke if the corresponding signal has received. The real signal
handlers mark these functions as ready to be executed and the event
loop, in a later iteration, calls them. See the function
invoke_async_signal_handler. */
-void *sigint_token;
+static struct async_signal_handler *sigint_token;
#ifdef SIGHUP
-void *sighup_token;
+static struct async_signal_handler *sighup_token;
#endif
#ifdef SIGQUIT
-void *sigquit_token;
-#endif
-void *sigfpe_token;
-#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
-void *sigwinch_token;
+static struct async_signal_handler *sigquit_token;
#endif
+static struct async_signal_handler *sigfpe_token;
#ifdef STOP_SIGNAL
-void *sigtstp_token;
+static struct async_signal_handler *sigtstp_token;
#endif
+static struct async_signal_handler *async_sigterm_token;
/* Structure to save a partially entered command. This is used when
the user types '\' at the end of a command line. This is necessary
because each line of input is handled by a different call to
command_line_handler, and normally there is no state retained
between different calls. */
-int more_to_come = 0;
+static int more_to_come = 0;
struct readline_input_state
{
}
/* Initialize all the necessary variables, start the event loop,
- register readline, and stdin, start the loop. */
+ register readline, and stdin, start the loop. The DATA is the
+ interpreter data cookie, ignored for now. */
+
void
-cli_command_loop (void)
+cli_command_loop (void *data)
{
- /* If we are using readline, set things up and display the first
- prompt, otherwise just print the prompt. */
- if (async_command_editing_p)
- {
- int length;
- char *a_prompt;
- char *gdb_prompt = get_prompt (0);
-
- /* Tell readline what the prompt to display is and what function
- it will need to call after a whole line is read. This also
- displays the first prompt. */
- length = strlen (get_prefix (0))
- + strlen (gdb_prompt) + strlen (get_suffix(0)) + 1;
- a_prompt = (char *) alloca (length);
- strcpy (a_prompt, get_prefix (0));
- strcat (a_prompt, gdb_prompt);
- strcat (a_prompt, get_suffix (0));
- rl_callback_handler_install (a_prompt, input_handler);
- }
- else
- display_gdb_prompt (0);
+ display_gdb_prompt (0);
/* Now it's time to start the event loop. */
start_event_loop ();
}
}
-/* Displays the prompt. The prompt that is displayed is the current
- top of the prompt stack, if the argument NEW_PROMPT is
- 0. Otherwise, it displays whatever NEW_PROMPT is. This is used
- after each gdb command has completed, and in the following cases:
+/* Displays the prompt. If the argument NEW_PROMPT is NULL, the
+ prompt that is displayed is the current top level prompt.
+ Otherwise, it displays whatever NEW_PROMPT is as a local/secondary
+ prompt.
+
+ This is used after each gdb command has completed, and in the
+ following cases:
+
1. When the user enters a command line which is ended by '\'
- indicating that the command will continue on the next line.
- In that case the prompt that is displayed is the empty string.
+ indicating that the command will continue on the next line. In
+ that case the prompt that is displayed is the empty string.
+
2. When the user is entering 'commands' for a breakpoint, or
actions for a tracepoint. In this case the prompt will be '>'
- 3. Other????
- FIXME: 2. & 3. not implemented yet for async. */
+
+ 3. On prompting for pagination. */
+
void
display_gdb_prompt (char *new_prompt)
{
- int prompt_length = 0;
char *actual_gdb_prompt = NULL;
+ struct cleanup *old_chain;
+
+ annotate_display_prompt ();
/* Reset the nesting depth used when trace-commands is set. */
reset_command_nest_depth ();
- /* Each interpreter has its own rules on displaying the command
- prompt. */
- if (!current_interp_display_prompt_p ())
- return;
+ old_chain = make_cleanup (free_current_contents, &actual_gdb_prompt);
- /* Get the prompt before the observers are called as observer hook
- functions may change the prompt. Do not call observers on an
- explicit prompt change as passed to this function, as this forms
- a temporary prompt, IE, displayed but not set. */
+ /* Do not call the python hook on an explicit prompt change as
+ passed to this function, as this forms a secondary/local prompt,
+ IE, displayed but not set. */
if (! new_prompt)
{
- char *post_gdb_prompt = NULL;
- char *pre_gdb_prompt = xstrdup (get_prompt (0));
-
- observer_notify_before_prompt (pre_gdb_prompt);
- post_gdb_prompt = get_prompt (0);
-
- /* If the observer changed the prompt, use that prompt. */
- if (strcmp (pre_gdb_prompt, post_gdb_prompt) != 0)
- actual_gdb_prompt = post_gdb_prompt;
-
- xfree (pre_gdb_prompt);
- }
-
- if (sync_execution && is_running (inferior_ptid))
- {
- /* This is to trick readline into not trying to display the
- prompt. Even though we display the prompt using this
- function, readline still tries to do its own display if we
- don't call rl_callback_handler_install and
- rl_callback_handler_remove (which readline detects because a
- global variable is not set). If readline did that, it could
- mess up gdb signal handlers for SIGINT. Readline assumes
- that between calls to rl_set_signals and rl_clear_signals gdb
- doesn't do anything with the signal handlers. Well, that's
- not the case, because when the target executes we change the
- SIGINT signal handler. If we allowed readline to display the
- prompt, the signal handler change would happen exactly
- between the calls to the above two functions.
- Calling rl_callback_handler_remove(), does the job. */
-
- rl_callback_handler_remove ();
- return;
- }
-
- /* If the observer changed the prompt, ACTUAL_GDB_PROMPT will not be
- NULL. Otherwise, either copy the existing prompt, or set it to
- NEW_PROMPT. */
- if (! actual_gdb_prompt)
- {
- if (! new_prompt)
+ if (sync_execution)
{
- /* Just use the top of the prompt stack. */
- prompt_length = strlen (get_prefix (0)) +
- strlen (get_suffix (0)) +
- strlen (get_prompt (0)) + 1;
-
- actual_gdb_prompt = (char *) alloca (prompt_length);
-
- /* Prefix needs to have new line at end. */
- strcpy (actual_gdb_prompt, get_prefix (0));
- strcat (actual_gdb_prompt, get_prompt (0));
- /* Suffix needs to have a new line at end and \032 \032 at
- beginning. */
- strcat (actual_gdb_prompt, get_suffix (0));
+ /* This is to trick readline into not trying to display the
+ prompt. Even though we display the prompt using this
+ function, readline still tries to do its own display if
+ we don't call rl_callback_handler_install and
+ rl_callback_handler_remove (which readline detects
+ because a global variable is not set). If readline did
+ that, it could mess up gdb signal handlers for SIGINT.
+ Readline assumes that between calls to rl_set_signals and
+ rl_clear_signals gdb doesn't do anything with the signal
+ handlers. Well, that's not the case, because when the
+ target executes we change the SIGINT signal handler. If
+ we allowed readline to display the prompt, the signal
+ handler change would happen exactly between the calls to
+ the above two functions. Calling
+ rl_callback_handler_remove(), does the job. */
+
+ rl_callback_handler_remove ();
+ do_cleanups (old_chain);
+ return;
}
else
- actual_gdb_prompt = new_prompt;;
+ {
+ /* Display the top level prompt. */
+ actual_gdb_prompt = top_level_prompt ();
+ }
}
+ else
+ actual_gdb_prompt = xstrdup (new_prompt);
if (async_command_editing_p)
{
fputs_unfiltered (actual_gdb_prompt, gdb_stdout);
gdb_flush (gdb_stdout);
}
+
+ do_cleanups (old_chain);
}
-/* Used when the user requests a different annotation level, with
- 'set annotate'. It pushes a new prompt (with prefix and suffix) on top
- of the prompt stack, if the annotation level desired is 2, otherwise
- it pops the top of the prompt stack when we want the annotation level
- to be the normal ones (1 or 0). */
-static void
-change_annotation_level (void)
+/* Return the top level prompt, as specified by "set prompt", possibly
+ overriden by the python gdb.prompt_hook hook, and then composed
+ with the prompt prefix and suffix (annotations). The caller is
+ responsible for freeing the returned string. */
+
+static char *
+top_level_prompt (void)
{
- char *prefix, *suffix;
+ char *prefix;
+ char *prompt = NULL;
+ char *suffix;
+ char *composed_prompt;
+ size_t prompt_length;
- if (!get_prefix (0) || !get_prompt (0) || !get_suffix (0))
- {
- /* The prompt stack has not been initialized to "", we are
- using gdb w/o the --async switch. */
- warning (_("Command has same effect as set annotate"));
- return;
- }
+ /* Give observers a chance of changing the prompt. E.g., the python
+ `gdb.prompt_hook' is installed as an observer. */
+ observer_notify_before_prompt (get_prompt ());
+
+ prompt = xstrdup (get_prompt ());
- if (annotation_level > 1)
+ if (annotation_level >= 2)
{
- if (!strcmp (get_prefix (0), "") && !strcmp (get_suffix (0), ""))
- {
- /* Push a new prompt if the previous annotation_level was not >1. */
- prefix = (char *) alloca (strlen (async_annotation_suffix) + 10);
- strcpy (prefix, "\n\032\032pre-");
- strcat (prefix, async_annotation_suffix);
- strcat (prefix, "\n");
-
- suffix = (char *) alloca (strlen (async_annotation_suffix) + 6);
- strcpy (suffix, "\n\032\032");
- strcat (suffix, async_annotation_suffix);
- strcat (suffix, "\n");
-
- push_prompt (prefix, (char *) 0, suffix);
- }
+ /* Prefix needs to have new line at end. */
+ prefix = (char *) alloca (strlen (async_annotation_suffix) + 10);
+ strcpy (prefix, "\n\032\032pre-");
+ strcat (prefix, async_annotation_suffix);
+ strcat (prefix, "\n");
+
+ /* Suffix needs to have a new line at end and \032 \032 at
+ beginning. */
+ suffix = (char *) alloca (strlen (async_annotation_suffix) + 6);
+ strcpy (suffix, "\n\032\032");
+ strcat (suffix, async_annotation_suffix);
+ strcat (suffix, "\n");
}
else
{
- if (strcmp (get_prefix (0), "") && strcmp (get_suffix (0), ""))
- {
- /* Pop the top of the stack, we are going back to annotation < 1. */
- pop_prompt ();
- }
+ prefix = "";
+ suffix = "";
}
-}
-/* Pushes a new prompt on the prompt stack. Each prompt has three
- parts: prefix, prompt, suffix. Usually prefix and suffix are empty
- strings, except when the annotation level is 2. Memory is allocated
- within xstrdup for the new prompt. */
-void
-push_prompt (char *prefix, char *prompt, char *suffix)
-{
- the_prompts.top++;
- set_prefix (prefix, 0);
-
- /* Note that this function is used by the set annotate 2
- command. This is why we take care of saving the old prompt
- in case a new one is not specified. */
- if (prompt)
- set_prompt (prompt, 0);
- else
- set_prompt (get_prompt (-1), 0);
+ prompt_length = strlen (prefix) + strlen (prompt) + strlen (suffix);
+ composed_prompt = xmalloc (prompt_length + 1);
- set_suffix (suffix, 0);
-}
+ strcpy (composed_prompt, prefix);
+ strcat (composed_prompt, prompt);
+ strcat (composed_prompt, suffix);
-/* Pops the top of the prompt stack, and frees the memory allocated
- for it. */
-void
-pop_prompt (void)
-{
- /* If we are not during a 'synchronous' execution command, in which
- case, the top prompt would be empty. */
- if (strcmp (get_prompt (0), ""))
- /* This is for the case in which the prompt is set while the
- annotation level is 2. The top prompt will be changed, but when
- we return to annotation level < 2, we want that new prompt to be
- in effect, until the user does another 'set prompt'. */
- if (strcmp (get_prompt (0), get_prompt (-1)))
- set_prompt (get_prompt (0), -1);
-
- set_prefix (NULL, 0);
- set_prompt (NULL, 0);
- set_suffix (NULL, 0);
- the_prompts.top--;
+ xfree (prompt);
+
+ return composed_prompt;
}
/* When there is an event ready on the stdin file desriptor, instead
sync_execution. Current target_terminal_ours() implementations
check for sync_execution before switching the terminal. */
target_terminal_ours ();
- pop_prompt ();
sync_execution = 0;
}
}
void
async_disable_stdin (void)
{
- if (!sync_execution)
- {
- sync_execution = 1;
- push_prompt ("", "", "");
- }
+ sync_execution = 1;
}
\f
int stdin_is_tty = ISATTY (stdin);
struct cleanup *stat_chain;
- quit_flag = 0;
+ clear_quit_flag ();
if (instream == stdin && stdin_is_tty)
reinitialize_more_filter ();
char *p;
char *p1;
char *nline;
- char got_eof = 0;
-
int repeat = (instream == stdin);
if (annotation_level > 1 && instream == stdin)
p = readline_input_state.linebuffer_ptr;
xfree (readline_input_state.linebuffer);
more_to_come = 0;
- pop_prompt ();
}
#ifdef STOP_SIGNAL
and exit from gdb. */
if (!rl || rl == (char *) EOF)
{
- got_eof = 1;
command_handler (0);
return; /* Lint. */
}
input expected to complete the command. So, we need to
print an empty prompt here. */
more_to_come = 1;
- push_prompt ("", "", "");
- display_gdb_prompt (0);
+ display_gdb_prompt ("");
return;
}
*p = 0;
/* Add line to history if appropriate. */
- if (instream == stdin
- && ISATTY (stdin) && *linebuffer)
+ if (*linebuffer && input_from_terminal_p ())
add_history (linebuffer);
/* Note: lines consisting solely of comments are added to the command
sigint_token =
create_async_signal_handler (async_request_quit, NULL);
signal (SIGTERM, handle_sigterm);
+ async_sigterm_token
+ = create_async_signal_handler (async_sigterm_handler, NULL);
/* If SIGTRAP was set to SIG_IGN, then the SIG_IGN will get passed
to the inferior and breakpoints will be ignored. */
sigfpe_token =
create_async_signal_handler (async_float_handler, NULL);
-#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
- signal (SIGWINCH, handle_sigwinch);
- sigwinch_token =
- create_async_signal_handler (SIGWINCH_HANDLER, NULL);
-#endif
#ifdef STOP_SIGNAL
sigtstp_token =
create_async_signal_handler (async_stop_sig, NULL);
#endif
-
-}
-
-void
-mark_async_signal_handler_wrapper (void *token)
-{
- mark_async_signal_handler ((struct async_signal_handler *) token);
}
/* Tell the event loop what to do if SIGINT is received.
set quit_flag to 1 here. Then if QUIT is called before we get to
the event loop, we will unwind as expected. */
- quit_flag = 1;
+ set_quit_flag ();
/* If immediate_quit is set, we go ahead and process the SIGINT right
away, even if we usually would defer this to the event loop. The
gdb_call_async_signal_handler (sigint_token, immediate_quit);
}
+/* Handle GDB exit upon receiving SIGTERM if target_can_async_p (). */
+
+static void
+async_sigterm_handler (gdb_client_data arg)
+{
+ quit_force (NULL, stdin == instream);
+}
+
+/* See defs.h. */
+volatile int sync_quit_force_run;
+
/* Quit GDB if SIGTERM is received.
GDB would quit anyway, but this way it will clean up properly. */
void
handle_sigterm (int sig)
{
signal (sig, handle_sigterm);
- quit_force ((char *) 0, stdin == instream);
+
+ /* Call quit_force in a signal safe way.
+ quit_force itself is not signal safe. */
+ if (target_can_async_p ())
+ mark_async_signal_handler (async_sigterm_token);
+ else
+ {
+ sync_quit_force_run = 1;
+ set_quit_flag ();
+ }
}
/* Do the quit. All the checks have been done by the caller. */
/* If the quit_flag has gotten reset back to 0 by the time we get
back here, that means that an exception was thrown to unwind the
current command before we got back to the event loop. So there
- is no reason to call quit again here, unless immediate_quit is
- set. */
+ is no reason to call quit again here. */
- if (quit_flag || immediate_quit)
+ if (check_quit_flag ())
quit ();
}
static void
handle_sigquit (int sig)
{
- mark_async_signal_handler_wrapper (sigquit_token);
+ mark_async_signal_handler (sigquit_token);
signal (sig, handle_sigquit);
}
#endif
static void
handle_sighup (int sig)
{
- mark_async_signal_handler_wrapper (sighup_token);
+ mark_async_signal_handler (sighup_token);
signal (sig, handle_sighup);
}
static void
async_disconnect (gdb_client_data arg)
{
- catch_errors (quit_cover, NULL,
- "Could not kill the program being debugged",
- RETURN_MASK_ALL);
+ volatile struct gdb_exception exception;
+
+ TRY_CATCH (exception, RETURN_MASK_ALL)
+ {
+ quit_cover ();
+ }
+
+ if (exception.reason < 0)
+ {
+ fputs_filtered ("Could not kill the program being debugged",
+ gdb_stderr);
+ exception_print (gdb_stderr, exception);
+ }
+
+ TRY_CATCH (exception, RETURN_MASK_ALL)
+ {
+ pop_all_targets ();
+ }
+
signal (SIGHUP, SIG_DFL); /*FIXME: ??????????? */
raise (SIGHUP);
}
void
handle_stop_sig (int sig)
{
- mark_async_signal_handler_wrapper (sigtstp_token);
+ mark_async_signal_handler (sigtstp_token);
signal (sig, handle_stop_sig);
}
static void
async_stop_sig (gdb_client_data arg)
{
- char *prompt = get_prompt (0);
+ char *prompt = get_prompt ();
#if STOP_SIGNAL == SIGTSTP
signal (SIGTSTP, SIG_DFL);
static void
handle_sigfpe (int sig)
{
- mark_async_signal_handler_wrapper (sigfpe_token);
+ mark_async_signal_handler (sigfpe_token);
signal (sig, handle_sigfpe);
}
divide by zero causes this, so "float" is a misnomer. */
error (_("Erroneous arithmetic operation."));
}
-
-/* Tell the event loop what to do if SIGWINCH is received.
- See event-signal.c. */
-#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
-static void
-handle_sigwinch (int sig)
-{
- mark_async_signal_handler_wrapper (sigwinch_token);
- signal (sig, handle_sigwinch);
-}
-#endif
\f
/* Called by do_setshow_command. */
change_line_handler ();
}
-/* Called by do_setshow_command. */
-void
-set_async_annotation_level (char *args, int from_tty,
- struct cmd_list_element *c)
-{
- change_annotation_level ();
-}
-
-/* Called by do_setshow_command. */
-void
-set_async_prompt (char *args, int from_tty, struct cmd_list_element *c)
-{
- set_prompt (new_async_prompt, 0);
-}
-
/* Set things up for readline to be invoked via the alternate
interface, i.e. via a callback function (rl_callback_read_char),
and hook up instream to the event loop. */
time. */
if (!batch_silent)
gdb_stdout = stdio_fileopen (stdout);
- gdb_stderr = stdio_fileopen (stderr);
+ gdb_stderr = stderr_fileopen ();
gdb_stdlog = gdb_stderr; /* for moment */
gdb_stdtarg = gdb_stderr; /* for moment */
gdb_stdtargerr = gdb_stderr; /* for moment */
projects / platform / upstream / binutils.git / blobdiff