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old-cross-binutils/gdb/tui/tui.c
Pedro Alves 492d29ea1c Split TRY_CATCH into TRY + CATCH 
This patch splits the TRY_CATCH macro into three, so that we go from
this:

~~~
  volatile gdb_exception ex;

  TRY_CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  if (ex.reason < 0)
    {
    }
~~~

to this:

~~~
  TRY
    {
    }
  CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  END_CATCH
~~~

Thus, we'll be getting rid of the local volatile exception object, and
declaring the caught exception in the catch block.

This allows reimplementing TRY/CATCH in terms of C++ exceptions when
building in C++ mode, while still allowing to build GDB in C mode
(using setjmp/longjmp), as a transition step.

TBC, after this patch, is it _not_ valid to have code between the TRY
and the CATCH blocks, like:

  TRY
    {
    }

  // some code here.

  CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  END_CATCH

Just like it isn't valid to do that with C++'s native try/catch.

By switching to creating the exception object inside the CATCH block
scope, we can get rid of all the explicitly allocated volatile
exception objects all over the tree, and map the CATCH block more
directly to C++'s catch blocks.

The majority of the TRY_CATCH -> TRY+CATCH+END_CATCH conversion was
done with a script, rerun from scratch at every rebase, no manual
editing involved.  After the mechanical conversion, a few places
needed manual intervention, to fix preexisting cases where we were
using the exception object outside of the TRY_CATCH block, and cases
where we were using "else" after a 'if (ex.reason) < 0)' [a CATCH
after this patch].  The result was folded into this patch so that GDB
still builds at each incremental step.

END_CATCH is necessary for two reasons:

First, because we name the exception object in the CATCH block, which
requires creating a scope, which in turn must be closed somewhere.
Declaring the exception variable in the initializer field of a for
block, like:

  #define CATCH(EXCEPTION, mask) \
    for (struct gdb_exception EXCEPTION; \
         exceptions_state_mc_catch (&EXCEPTION, MASK); \
	 EXCEPTION = exception_none)

would avoid needing END_CATCH, but alas, in C mode, we build with C90,
which doesn't allow mixed declarations and code.

Second, because when TRY/CATCH are wired to real C++ try/catch, as
long as we need to handle cleanup chains, even if there's no CATCH
block that wants to catch the exception, we need for stop at every
frame in the unwind chain and run cleanups, then rethrow.  That will
be done in END_CATCH.

After we require C++, we'll still need TRY/CATCH/END_CATCH until
cleanups are completely phased out -- TRY/CATCH in C++ mode will
save/restore the current cleanup chain, like in C mode, and END_CATCH
catches otherwise uncaugh exceptions, runs cleanups and rethrows, so
that C++ cleanups and exceptions can coexist.

IMO, this still makes the TRY/CATCH code look a bit more like a
newcomer would expect, so IMO worth it even if we weren't considering
C++.

gdb/ChangeLog.
2015-03-07  Pedro Alves  <palves@redhat.com>

	* common/common-exceptions.c (struct catcher) <exception>: No
	longer a pointer to volatile exception.  Now an exception value.
	<mask>: Delete field.
	(exceptions_state_mc_init): Remove all parameters.  Adjust.
	(exceptions_state_mc): No longer pop the catcher here.
	(exceptions_state_mc_catch): New function.
	(throw_exception): Adjust.
	* common/common-exceptions.h (exceptions_state_mc_init): Remove
	all parameters.
	(exceptions_state_mc_catch): Declare.
	(TRY_CATCH): Rename to ...
	(TRY): ... this.  Remove EXCEPTION and MASK parameters.
	(CATCH, END_CATCH): New.
	All callers adjusted.

gdb/gdbserver/ChangeLog:
2015-03-07  Pedro Alves  <palves@redhat.com>

	Adjust all callers of TRY_CATCH to use TRY/CATCH/END_CATCH
	instead.
2015-03-07 15:14:14 +00:00

656 lines
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/* General functions for the WDB TUI.
Copyright (C) 1998-2015 Free Software Foundation, Inc.
Contributed by Hewlett-Packard Company.
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"
#include "tui/tui.h"
#include "tui/tui-hooks.h"
#include "tui/tui-data.h"
#include "tui/tui-layout.h"
#include "tui/tui-io.h"
#include "tui/tui-regs.h"
#include "tui/tui-stack.h"
#include "tui/tui-win.h"
#include "tui/tui-winsource.h"
#include "tui/tui-windata.h"
#include "target.h"
#include "frame.h"
#include "breakpoint.h"
#include "inferior.h"
#include "symtab.h"
#include "source.h"
#include "terminal.h"
#include <ctype.h>
#include <signal.h>
#include <fcntl.h>
#if 0
#include <termio.h>
#endif
#include <setjmp.h>
#include "gdb_curses.h"
#include "interps.h"
/* This redefines CTRL if it is not already defined, so it must come
after terminal state releated include files like <term.h> and
"gdb_curses.h". */
#include "readline/readline.h"
/* Tells whether the TUI is active or not. */
int tui_active = 0;
static int tui_finish_init = 1;
enum tui_key_mode tui_current_key_mode = TUI_COMMAND_MODE;
struct tui_char_command
{
unsigned char key;
const char *cmd;
};
/* Key mapping to gdb commands when the TUI is using the single key
mode. */
static const struct tui_char_command tui_commands[] = {
{ 'c', "continue" },
{ 'd', "down" },
{ 'f', "finish" },
{ 'n', "next" },
{ 'r', "run" },
{ 's', "step" },
{ 'u', "up" },
{ 'v', "info locals" },
{ 'w', "where" },
{ 0, 0 },
};
static Keymap tui_keymap;
static Keymap tui_readline_standard_keymap;
/* TUI readline command.
Switch the output mode between TUI/standard gdb. */
static int
tui_rl_switch_mode (int notused1, int notused2)
{
/* Don't let exceptions escape. We're in the middle of a readline
callback that isn't prepared for that. */
TRY
{
if (tui_active)
{
tui_disable ();
rl_prep_terminal (0);
}
else
{
/* If tui_enable throws, we'll re-prep below. */
rl_deprep_terminal ();
tui_enable ();
}
}
CATCH (ex, RETURN_MASK_ALL)
{
exception_print (gdb_stderr, ex);
if (!tui_active)
rl_prep_terminal (0);
}
END_CATCH
/* Clear the readline in case switching occurred in middle of
something. */
if (rl_end)
rl_kill_text (0, rl_end);
/* Since we left the curses mode, the terminal mode is restored to
some previous state. That state may not be suitable for readline
to work correctly (it may be restored in line mode). We force an
exit of the current readline so that readline is re-entered and
it will be able to setup the terminal for its needs. By
re-entering in readline, we also redisplay its prompt in the
non-curses mode. */
rl_newline (1, '\n');
/* Make sure the \n we are returning does not repeat the last
command. */
dont_repeat ();
return 0;
}
/* TUI readline command.
Change the TUI layout to show a next layout.
This function is bound to CTRL-X 2. It is intended to provide
a functionality close to the Emacs split-window command. We
always show two windows (src+asm), (src+regs) or (asm+regs). */
static int
tui_rl_change_windows (int notused1, int notused2)
{
if (!tui_active)
tui_rl_switch_mode (0 /* notused */, 0 /* notused */);
if (tui_active)
{
enum tui_layout_type new_layout;
enum tui_register_display_type regs_type = TUI_UNDEFINED_REGS;
new_layout = tui_current_layout ();
/* Select a new layout to have a rolling layout behavior with
always two windows (except when undefined). */
switch (new_layout)
{
case SRC_COMMAND:
new_layout = SRC_DISASSEM_COMMAND;
break;
case DISASSEM_COMMAND:
new_layout = SRC_DISASSEM_COMMAND;
break;
case SRC_DATA_COMMAND:
new_layout = SRC_DISASSEM_COMMAND;
break;
case SRC_DISASSEM_COMMAND:
new_layout = DISASSEM_DATA_COMMAND;
break;
case DISASSEM_DATA_COMMAND:
new_layout = SRC_DATA_COMMAND;
break;
default:
new_layout = SRC_COMMAND;
break;
}
tui_set_layout (new_layout, regs_type);
}
return 0;
}
/* TUI readline command.
Delete the second TUI window to only show one. */
static int
tui_rl_delete_other_windows (int notused1, int notused2)
{
if (!tui_active)
tui_rl_switch_mode (0 /* notused */, 0 /* notused */);
if (tui_active)
{
enum tui_layout_type new_layout;
enum tui_register_display_type regs_type = TUI_UNDEFINED_REGS;
new_layout = tui_current_layout ();
/* Kill one window. */
switch (new_layout)
{
case SRC_COMMAND:
case SRC_DATA_COMMAND:
case SRC_DISASSEM_COMMAND:
default:
new_layout = SRC_COMMAND;
break;
case DISASSEM_COMMAND:
case DISASSEM_DATA_COMMAND:
new_layout = DISASSEM_COMMAND;
break;
}
tui_set_layout (new_layout, regs_type);
}
return 0;
}
/* TUI readline command.
Switch the active window to give the focus to a next window. */
static int
tui_rl_other_window (int count, int key)
{
struct tui_win_info *win_info;
if (!tui_active)
tui_rl_switch_mode (0 /* notused */, 0 /* notused */);
win_info = tui_next_win (tui_win_with_focus ());
if (win_info)
{
tui_set_win_focus_to (win_info);
if (TUI_DATA_WIN && TUI_DATA_WIN->generic.is_visible)
tui_refresh_data_win ();
keypad (TUI_CMD_WIN->generic.handle, (win_info != TUI_CMD_WIN));
}
return 0;
}
/* TUI readline command.
Execute the gdb command bound to the specified key. */
static int
tui_rl_command_key (int count, int key)
{
int i;
reinitialize_more_filter ();
for (i = 0; tui_commands[i].cmd; i++)
{
if (tui_commands[i].key == key)
{
/* Insert the command in the readline buffer.
Avoid calling the gdb command here since it creates
a possible recursion on readline if prompt_for_continue
is called (See PR 9584). The command will also appear
in the readline history which turns out to be better. */
rl_insert_text (tui_commands[i].cmd);
rl_newline (1, '\n');
/* Switch to gdb command mode while executing the command.
This way the gdb's continue prompty will be displayed. */
tui_set_key_mode (TUI_ONE_COMMAND_MODE);
return 0;
}
}
return 0;
}
/* TUI readline command.
Temporarily leave the TUI SingleKey mode to allow editing
a gdb command with the normal readline. Once the command
is executed, the TUI SingleKey mode is installed back. */
static int
tui_rl_command_mode (int count, int key)
{
tui_set_key_mode (TUI_ONE_COMMAND_MODE);
return rl_insert (count, key);
}
/* TUI readline command.
Switch between TUI SingleKey mode and gdb readline editing. */
static int
tui_rl_next_keymap (int notused1, int notused2)
{
if (!tui_active)
tui_rl_switch_mode (0 /* notused */, 0 /* notused */);
tui_set_key_mode (tui_current_key_mode == TUI_COMMAND_MODE
? TUI_SINGLE_KEY_MODE : TUI_COMMAND_MODE);
return 0;
}
/* Readline hook to redisplay ourself the gdb prompt.
In the SingleKey mode, the prompt is not printed so that
the command window is cleaner. It will be displayed if
we temporarily leave the SingleKey mode. */
static int
tui_rl_startup_hook (void)
{
rl_already_prompted = 1;
if (tui_current_key_mode != TUI_COMMAND_MODE && immediate_quit == 0)
tui_set_key_mode (TUI_SINGLE_KEY_MODE);
tui_redisplay_readline ();
return 0;
}
/* Change the TUI key mode by installing the appropriate readline
keymap. */
void
tui_set_key_mode (enum tui_key_mode mode)
{
tui_current_key_mode = mode;
rl_set_keymap (mode == TUI_SINGLE_KEY_MODE
? tui_keymap : tui_readline_standard_keymap);
tui_show_locator_content ();
}
/* Initialize readline and configure the keymap for the switching
key shortcut. */
void
tui_initialize_readline (void)
{
int i;
Keymap tui_ctlx_keymap;
rl_initialize ();
rl_add_defun ("tui-switch-mode", tui_rl_switch_mode, -1);
rl_add_defun ("gdb-command", tui_rl_command_key, -1);
rl_add_defun ("next-keymap", tui_rl_next_keymap, -1);
tui_keymap = rl_make_bare_keymap ();
tui_ctlx_keymap = rl_make_bare_keymap ();
tui_readline_standard_keymap = rl_get_keymap ();
for (i = 0; tui_commands[i].cmd; i++)
rl_bind_key_in_map (tui_commands[i].key, tui_rl_command_key, tui_keymap);
rl_generic_bind (ISKMAP, "\\C-x", (char*) tui_ctlx_keymap, tui_keymap);
/* Bind all other keys to tui_rl_command_mode so that we switch
temporarily from SingleKey mode and can enter a gdb command. */
for (i = ' '; i < 0x7f; i++)
{
int j;
for (j = 0; tui_commands[j].cmd; j++)
if (tui_commands[j].key == i)
break;
if (tui_commands[j].cmd)
continue;
rl_bind_key_in_map (i, tui_rl_command_mode, tui_keymap);
}
rl_bind_key_in_map ('a', tui_rl_switch_mode, emacs_ctlx_keymap);
rl_bind_key_in_map ('a', tui_rl_switch_mode, tui_ctlx_keymap);
rl_bind_key_in_map ('A', tui_rl_switch_mode, emacs_ctlx_keymap);
rl_bind_key_in_map ('A', tui_rl_switch_mode, tui_ctlx_keymap);
rl_bind_key_in_map (CTRL ('A'), tui_rl_switch_mode, emacs_ctlx_keymap);
rl_bind_key_in_map (CTRL ('A'), tui_rl_switch_mode, tui_ctlx_keymap);
rl_bind_key_in_map ('1', tui_rl_delete_other_windows, emacs_ctlx_keymap);
rl_bind_key_in_map ('1', tui_rl_delete_other_windows, tui_ctlx_keymap);
rl_bind_key_in_map ('2', tui_rl_change_windows, emacs_ctlx_keymap);
rl_bind_key_in_map ('2', tui_rl_change_windows, tui_ctlx_keymap);
rl_bind_key_in_map ('o', tui_rl_other_window, emacs_ctlx_keymap);
rl_bind_key_in_map ('o', tui_rl_other_window, tui_ctlx_keymap);
rl_bind_key_in_map ('q', tui_rl_next_keymap, tui_keymap);
rl_bind_key_in_map ('s', tui_rl_next_keymap, emacs_ctlx_keymap);
rl_bind_key_in_map ('s', tui_rl_next_keymap, tui_ctlx_keymap);
}
/* Return the TERM variable from the environment, or "<unset>"
if not set. */
static const char *
gdb_getenv_term (void)
{
const char *term;
term = getenv ("TERM");
if (term != NULL)
return term;
return "<unset>";
}
/* Enter in the tui mode (curses).
When in normal mode, it installs the tui hooks in gdb, redirects
the gdb output, configures the readline to work in tui mode.
When in curses mode, it does nothing. */
void
tui_enable (void)
{
struct interp *interp;
if (tui_active)
return;
/* To avoid to initialize curses when gdb starts, there is a defered
curses initialization. This initialization is made only once
and the first time the curses mode is entered. */
if (tui_finish_init)
{
WINDOW *w;
SCREEN *s;
const char *cap;
const char *interp;
/* If the top level interpreter is not the console/tui (e.g.,
MI), enabling curses will certainly lose. */
interp = interp_name (top_level_interpreter ());
if (strcmp (interp, INTERP_TUI) != 0)
error (_("Cannot enable the TUI when the interpreter is '%s'"), interp);
/* Don't try to setup curses (and print funny control
characters) if we're not outputting to a terminal. */
if (!ui_file_isatty (gdb_stdout))
error (_("Cannot enable the TUI when output is not a terminal"));
s = newterm (NULL, stdout, stdin);
#ifdef __MINGW32__
/* The MinGW port of ncurses requires $TERM to be unset in order
to activate the Windows console driver. */
if (s == NULL)
s = newterm ("unknown", stdout, stdin);
#endif
if (s == NULL)
{
error (_("Cannot enable the TUI: error opening terminal [TERM=%s]"),
gdb_getenv_term ());
}
w = stdscr;
/* Check required terminal capabilities. The MinGW port of
ncurses does have them, but doesn't expose them through "cup". */
#ifndef __MINGW32__
cap = tigetstr ("cup");
if (cap == NULL || cap == (char *) -1 || *cap == '\0')
{
endwin ();
delscreen (s);
error (_("Cannot enable the TUI: "
"terminal doesn't support cursor addressing [TERM=%s]"),
gdb_getenv_term ());
}
#endif
cbreak ();
noecho ();
/* timeout (1); */
nodelay(w, FALSE);
nl();
keypad (w, TRUE);
rl_initialize ();
tui_set_term_height_to (LINES);
tui_set_term_width_to (COLS);
def_prog_mode ();
tui_show_frame_info (0);
tui_set_layout (SRC_COMMAND, TUI_UNDEFINED_REGS);
tui_set_win_focus_to (TUI_SRC_WIN);
keypad (TUI_CMD_WIN->generic.handle, TRUE);
wrefresh (TUI_CMD_WIN->generic.handle);
tui_finish_init = 0;
}
else
{
/* Save the current gdb setting of the terminal.
Curses will restore this state when endwin() is called. */
def_shell_mode ();
clearok (stdscr, TRUE);
}
/* Install the TUI specific hooks. */
tui_install_hooks ();
rl_startup_hook = tui_rl_startup_hook;
tui_update_variables ();
tui_setup_io (1);
tui_active = 1;
/* Resize windows before anything might display/refresh a
window. */
if (tui_win_resized ())
{
tui_resize_all ();
tui_set_win_resized_to (FALSE);
}
if (deprecated_safe_get_selected_frame ())
tui_show_frame_info (deprecated_safe_get_selected_frame ());
/* Restore TUI keymap. */
tui_set_key_mode (tui_current_key_mode);
/* Refresh the screen. */
tui_refresh_all_win ();
/* Update gdb's knowledge of its terminal. */
gdb_save_tty_state ();
tui_update_gdb_sizes ();
}
/* Leave the tui mode.
Remove the tui hooks and configure the gdb output and readline
back to their original state. The curses mode is left so that
the terminal setting is restored to the point when we entered. */
void
tui_disable (void)
{
if (!tui_active)
return;
/* Restore initial readline keymap. */
rl_set_keymap (tui_readline_standard_keymap);
/* Remove TUI hooks. */
tui_remove_hooks ();
rl_startup_hook = 0;
rl_already_prompted = 0;
/* Leave curses and restore previous gdb terminal setting. */
endwin ();
/* gdb terminal has changed, update gdb internal copy of it
so that terminal management with the inferior works. */
tui_setup_io (0);
/* Update gdb's knowledge of its terminal. */
gdb_save_tty_state ();
tui_active = 0;
tui_update_gdb_sizes ();
}
void
strcat_to_buf (char *buf, int buflen,
const char *item_to_add)
{
if (item_to_add != (char *) NULL && buf != (char *) NULL)
{
if ((strlen (buf) + strlen (item_to_add)) <= buflen)
strcat (buf, item_to_add);
else
strncat (buf, item_to_add, (buflen - strlen (buf)));
}
}
#if 0
/* Solaris <sys/termios.h> defines CTRL. */
#ifndef CTRL
#define CTRL(x) (x & ~0140)
#endif
#define FILEDES 2
#define CHK(val, dft) (val<=0 ? dft : val)
static void
tui_reset (void)
{
struct termio mode;
/* Reset the teletype mode bits to a sensible state.
Copied tset.c. */
#if defined (TIOCGETC)
struct tchars tbuf;
#endif /* TIOCGETC */
#ifdef UCB_NTTY
struct ltchars ltc;
if (ldisc == NTTYDISC)
{
ioctl (FILEDES, TIOCGLTC, &ltc);
ltc.t_suspc = CHK (ltc.t_suspc, CTRL ('Z'));
ltc.t_dsuspc = CHK (ltc.t_dsuspc, CTRL ('Y'));
ltc.t_rprntc = CHK (ltc.t_rprntc, CTRL ('R'));
ltc.t_flushc = CHK (ltc.t_flushc, CTRL ('O'));
ltc.t_werasc = CHK (ltc.t_werasc, CTRL ('W'));
ltc.t_lnextc = CHK (ltc.t_lnextc, CTRL ('V'));
ioctl (FILEDES, TIOCSLTC, &ltc);
}
#endif /* UCB_NTTY */
#ifdef TIOCGETC
ioctl (FILEDES, TIOCGETC, &tbuf);
tbuf.t_intrc = CHK (tbuf.t_intrc, CTRL ('?'));
tbuf.t_quitc = CHK (tbuf.t_quitc, CTRL ('\\'));
tbuf.t_startc = CHK (tbuf.t_startc, CTRL ('Q'));
tbuf.t_stopc = CHK (tbuf.t_stopc, CTRL ('S'));
tbuf.t_eofc = CHK (tbuf.t_eofc, CTRL ('D'));
/* brkc is left alone. */
ioctl (FILEDES, TIOCSETC, &tbuf);
#endif /* TIOCGETC */
mode.sg_flags &= ~(RAW
#ifdef CBREAK
| CBREAK
#endif /* CBREAK */
| VTDELAY | ALLDELAY);
mode.sg_flags |= XTABS | ECHO | CRMOD | ANYP;
return;
}
#endif
void
tui_show_source (const char *fullname, int line)
{
struct symtab_and_line cursal = get_current_source_symtab_and_line ();
/* Make sure that the source window is displayed. */
tui_add_win_to_layout (SRC_WIN);
tui_update_source_windows_with_line (cursal.symtab, line);
tui_update_locator_fullname (fullname);
}
void
tui_show_assembly (struct gdbarch *gdbarch, CORE_ADDR addr)
{
tui_add_win_to_layout (DISASSEM_WIN);
tui_update_source_windows_with_addr (gdbarch, addr);
}
int
tui_is_window_visible (enum tui_win_type type)
{
if (tui_active == 0)
return 0;
if (tui_win_list[type] == 0)
return 0;
return tui_win_list[type]->generic.is_visible;
}
int
tui_get_command_dimension (unsigned int *width,
unsigned int *height)
{
if (!tui_active || (TUI_CMD_WIN == NULL))
{
return 0;
}
*width = TUI_CMD_WIN->generic.width;
*height = TUI_CMD_WIN->generic.height;
return 1;
}
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