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old-cross-binutils/gdb/tui/tui-regs.c
Andrew Burgess b93fd21dcc gdb: tui: Minor fix to compare against NULL. 
Minor coding standard fix to compare against NULL.

gdb/ChangeLog:

	* tui/tui-regs.c (tui_reg_next_command): Compare against NULL.
2015-05-26 22:31:23 +01:00

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/* TUI display registers in window.
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 "arch-utils.h"
#include "tui/tui.h"
#include "tui/tui-data.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "gdbcmd.h"
#include "frame.h"
#include "regcache.h"
#include "inferior.h"
#include "target.h"
#include "tui/tui-layout.h"
#include "tui/tui-win.h"
#include "tui/tui-windata.h"
#include "tui/tui-wingeneral.h"
#include "tui/tui-file.h"
#include "tui/tui-regs.h"
#include "tui/tui-io.h"
#include "reggroups.h"
#include "valprint.h"
#include "gdb_curses.h"
/*****************************************
** STATIC LOCAL FUNCTIONS FORWARD DECLS **
******************************************/
static void
tui_display_register (struct tui_data_element *data,
struct tui_gen_win_info *win_info);
static enum tui_status tui_show_register_group (struct reggroup *group,
struct frame_info *frame,
int refresh_values_only);
static enum tui_status tui_get_register (struct frame_info *frame,
struct tui_data_element *data,
int regnum, int *changedp);
/*****************************************
** PUBLIC FUNCTIONS **
******************************************/
/* Answer the number of the last line in the regs display. If there
are no registers (-1) is returned. */
int
tui_last_regs_line_no (void)
{
int num_lines = (-1);
if (TUI_DATA_WIN->detail.data_display_info.regs_content_count > 0)
{
num_lines = (TUI_DATA_WIN->detail.data_display_info.regs_content_count /
TUI_DATA_WIN->detail.data_display_info.regs_column_count);
if (TUI_DATA_WIN->detail.data_display_info.regs_content_count %
TUI_DATA_WIN->detail.data_display_info.regs_column_count)
num_lines++;
}
return num_lines;
}
/* Answer the line number that the register element at element_no is
on. If element_no is greater than the number of register elements
there are, -1 is returned. */
int
tui_line_from_reg_element_no (int element_no)
{
if (element_no < TUI_DATA_WIN->detail.data_display_info.regs_content_count)
{
int i, line = (-1);
i = 1;
while (line == (-1))
{
if (element_no <
(TUI_DATA_WIN->detail.data_display_info.regs_column_count * i))
line = i - 1;
else
i++;
}
return line;
}
else
return (-1);
}
/* Answer the index of the first element in line_no. If line_no is
past the register area (-1) is returned. */
int
tui_first_reg_element_no_inline (int line_no)
{
if ((line_no * TUI_DATA_WIN->detail.data_display_info.regs_column_count)
<= TUI_DATA_WIN->detail.data_display_info.regs_content_count)
return ((line_no + 1) *
TUI_DATA_WIN->detail.data_display_info.regs_column_count) -
TUI_DATA_WIN->detail.data_display_info.regs_column_count;
else
return (-1);
}
/* Show the registers of the given group in the data window
and refresh the window. */
void
tui_show_registers (struct reggroup *group)
{
enum tui_status ret = TUI_FAILURE;
struct tui_data_info *display_info;
/* Make sure the curses mode is enabled. */
tui_enable ();
/* Make sure the register window is visible. If not, select an
appropriate layout. */
if (TUI_DATA_WIN == NULL || !TUI_DATA_WIN->generic.is_visible)
tui_set_layout_by_name (DATA_NAME);
display_info = &TUI_DATA_WIN->detail.data_display_info;
if (group == 0)
group = general_reggroup;
/* Say that registers should be displayed, even if there is a
problem. */
display_info->display_regs = TRUE;
if (target_has_registers && target_has_stack && target_has_memory)
{
ret = tui_show_register_group (group, get_selected_frame (NULL),
group == display_info->current_group);
}
if (ret == TUI_FAILURE)
{
display_info->current_group = 0;
tui_erase_data_content (NO_REGS_STRING);
}
else
{
int i;
/* Clear all notation of changed values. */
for (i = 0; i < display_info->regs_content_count; i++)
{
struct tui_gen_win_info *data_item_win;
struct tui_win_element *win;
data_item_win = &display_info->regs_content[i]
->which_element.data_window;
win = data_item_win->content[0];
win->which_element.data.highlight = FALSE;
}
display_info->current_group = group;
tui_display_all_data ();
}
}
/* Set the data window to display the registers of the register group
using the given frame. Values are refreshed only when
refresh_values_only is TRUE. */
static enum tui_status
tui_show_register_group (struct reggroup *group,
struct frame_info *frame,
int refresh_values_only)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
enum tui_status ret = TUI_FAILURE;
int nr_regs;
int allocated_here = FALSE;
int regnum, pos;
char title[80];
struct tui_data_info *display_info = &TUI_DATA_WIN->detail.data_display_info;
/* Make a new title showing which group we display. */
snprintf (title, sizeof (title) - 1, "Register group: %s",
reggroup_name (group));
xfree (TUI_DATA_WIN->generic.title);
TUI_DATA_WIN->generic.title = xstrdup (title);
/* See how many registers must be displayed. */
nr_regs = 0;
for (regnum = 0;
regnum < gdbarch_num_regs (gdbarch)
+ gdbarch_num_pseudo_regs (gdbarch);
regnum++)
{
const char *name;
/* Must be in the group. */
if (!gdbarch_register_reggroup_p (gdbarch, regnum, group))
continue;
/* If the register name is empty, it is undefined for this
processor, so don't display anything. */
name = gdbarch_register_name (gdbarch, regnum);
if (name == 0 || *name == '\0')
continue;
nr_regs++;
}
if (display_info->regs_content_count > 0 && !refresh_values_only)
{
tui_free_data_content (display_info->regs_content,
display_info->regs_content_count);
display_info->regs_content_count = 0;
}
if (display_info->regs_content_count <= 0)
{
display_info->regs_content = tui_alloc_content (nr_regs, DATA_WIN);
allocated_here = TRUE;
refresh_values_only = FALSE;
}
if (display_info->regs_content != (tui_win_content) NULL)
{
if (!refresh_values_only || allocated_here)
{
TUI_DATA_WIN->generic.content = (void*) NULL;
TUI_DATA_WIN->generic.content_size = 0;
tui_add_content_elements (&TUI_DATA_WIN->generic, nr_regs);
display_info->regs_content
= (tui_win_content) TUI_DATA_WIN->generic.content;
display_info->regs_content_count = nr_regs;
}
/* Now set the register names and values. */
pos = 0;
for (regnum = 0;
regnum < gdbarch_num_regs (gdbarch)
+ gdbarch_num_pseudo_regs (gdbarch);
regnum++)
{
struct tui_gen_win_info *data_item_win;
struct tui_data_element *data;
const char *name;
/* Must be in the group. */
if (!gdbarch_register_reggroup_p (gdbarch, regnum, group))
continue;
/* If the register name is empty, it is undefined for this
processor, so don't display anything. */
name = gdbarch_register_name (gdbarch, regnum);
if (name == 0 || *name == '\0')
continue;
data_item_win =
&display_info->regs_content[pos]->which_element.data_window;
data = &data_item_win->content[0]->which_element.data;
if (data)
{
if (!refresh_values_only)
{
data->item_no = regnum;
data->name = name;
data->highlight = FALSE;
}
tui_get_register (frame, data, regnum, 0);
}
pos++;
}
TUI_DATA_WIN->generic.content_size =
display_info->regs_content_count + display_info->data_content_count;
ret = TUI_SUCCESS;
}
return ret;
}
/* Function to display the registers in the content from
'start_element_no' until the end of the register content or the end
of the display height. No checking for displaying past the end of
the registers is done here. */
void
tui_display_registers_from (int start_element_no)
{
struct tui_data_info *display_info = &TUI_DATA_WIN->detail.data_display_info;
if (display_info->regs_content != (tui_win_content) NULL
&& display_info->regs_content_count > 0)
{
int i = start_element_no;
int j, item_win_width, cur_y;
int max_len = 0;
for (i = 0; i < display_info->regs_content_count; i++)
{
struct tui_data_element *data;
struct tui_gen_win_info *data_item_win;
char *p;
int len;
data_item_win
= &display_info->regs_content[i]->which_element.data_window;
data = &data_item_win->content[0]->which_element.data;
len = 0;
p = data->content;
if (p != 0)
while (*p)
{
if (*p++ == '\t')
len = 8 * ((len / 8) + 1);
else
len++;
}
if (len > max_len)
max_len = len;
}
item_win_width = max_len + 1;
i = start_element_no;
display_info->regs_column_count =
(TUI_DATA_WIN->generic.width - 2) / item_win_width;
if (display_info->regs_column_count == 0)
display_info->regs_column_count = 1;
item_win_width =
(TUI_DATA_WIN->generic.width - 2) / display_info->regs_column_count;
/* Now create each data "sub" window, and write the display into
it. */
cur_y = 1;
while (i < display_info->regs_content_count
&& cur_y <= TUI_DATA_WIN->generic.viewport_height)
{
for (j = 0;
j < display_info->regs_column_count
&& i < display_info->regs_content_count;
j++)
{
struct tui_gen_win_info *data_item_win;
struct tui_data_element *data_element_ptr;
/* Create the window if necessary. */
data_item_win = &display_info->regs_content[i]
->which_element.data_window;
data_element_ptr = &data_item_win->content[0]->which_element.data;
if (data_item_win->handle != (WINDOW*) NULL
&& (data_item_win->height != 1
|| data_item_win->width != item_win_width
|| data_item_win->origin.x != (item_win_width * j) + 1
|| data_item_win->origin.y != cur_y))
{
tui_delete_win (data_item_win->handle);
data_item_win->handle = 0;
}
if (data_item_win->handle == (WINDOW *) NULL)
{
data_item_win->height = 1;
data_item_win->width = item_win_width;
data_item_win->origin.x = (item_win_width * j) + 1;
data_item_win->origin.y = cur_y;
tui_make_window (data_item_win, DONT_BOX_WINDOW);
scrollok (data_item_win->handle, FALSE);
}
touchwin (data_item_win->handle);
/* Get the printable representation of the register
and display it. */
tui_display_register (data_element_ptr, data_item_win);
i++; /* Next register. */
}
cur_y++; /* Next row. */
}
}
}
/* Function to display the registers in the content from
'start_element_no' on 'start_line_no' until the end of the register
content or the end of the display height. This function checks
that we won't display off the end of the register display. */
static void
tui_display_reg_element_at_line (int start_element_no,
int start_line_no)
{
if (TUI_DATA_WIN->detail.data_display_info.regs_content
!= (tui_win_content) NULL
&& TUI_DATA_WIN->detail.data_display_info.regs_content_count > 0)
{
int element_no = start_element_no;
if (start_element_no != 0 && start_line_no != 0)
{
int last_line_no, first_line_on_last_page;
last_line_no = tui_last_regs_line_no ();
first_line_on_last_page
= last_line_no - (TUI_DATA_WIN->generic.height - 2);
if (first_line_on_last_page < 0)
first_line_on_last_page = 0;
/* If there is no other data displayed except registers, and
the element_no causes us to scroll past the end of the
registers, adjust what element to really start the
display at. */
if (TUI_DATA_WIN->detail.data_display_info.data_content_count <= 0
&& start_line_no > first_line_on_last_page)
element_no
= tui_first_reg_element_no_inline (first_line_on_last_page);
}
tui_display_registers_from (element_no);
}
}
/* Function to display the registers starting at line line_no in the
data window. Answers the line number that the display actually
started from. If nothing is displayed (-1) is returned. */
int
tui_display_registers_from_line (int line_no,
int force_display)
{
if (TUI_DATA_WIN->detail.data_display_info.regs_content_count > 0)
{
int line, element_no;
if (line_no < 0)
line = 0;
else if (force_display)
{ /* If we must display regs (force_display is true), then
make sure that we don't display off the end of the
registers. */
if (line_no >= tui_last_regs_line_no ())
{
if ((line = tui_line_from_reg_element_no (
TUI_DATA_WIN->detail.data_display_info.regs_content_count - 1)) < 0)
line = 0;
}
else
line = line_no;
}
else
line = line_no;
element_no = tui_first_reg_element_no_inline (line);
if (element_no
< TUI_DATA_WIN->detail.data_display_info.regs_content_count)
tui_display_reg_element_at_line (element_no, line);
else
line = (-1);
return line;
}
return (-1); /* Nothing was displayed. */
}
/* This function check all displayed registers for changes in values,
given a particular frame. If the values have changed, they are
updated with the new value and highlighted. */
void
tui_check_register_values (struct frame_info *frame)
{
if (TUI_DATA_WIN != NULL
&& TUI_DATA_WIN->generic.is_visible)
{
struct tui_data_info *display_info
= &TUI_DATA_WIN->detail.data_display_info;
if (display_info->regs_content_count <= 0
&& display_info->display_regs)
tui_show_registers (display_info->current_group);
else
{
int i;
for (i = 0; (i < display_info->regs_content_count); i++)
{
struct tui_data_element *data;
struct tui_gen_win_info *data_item_win_ptr;
int was_hilighted;
data_item_win_ptr = &display_info->regs_content[i]->
which_element.data_window;
data = &data_item_win_ptr->content[0]->which_element.data;
was_hilighted = data->highlight;
tui_get_register (frame, data,
data->item_no, &data->highlight);
if (data->highlight || was_hilighted)
{
tui_display_register (data, data_item_win_ptr);
}
}
}
}
}
/* Display a register in a window. If hilite is TRUE, then the value
will be displayed in reverse video. */
static void
tui_display_register (struct tui_data_element *data,
struct tui_gen_win_info *win_info)
{
if (win_info->handle != (WINDOW *) NULL)
{
int i;
if (data->highlight)
/* We ignore the return value, casting it to void in order to avoid
a compiler warning. The warning itself was introduced by a patch
to ncurses 5.7 dated 2009-08-29, changing this macro to expand
to code that causes the compiler to generate an unused-value
warning. */
(void) wstandout (win_info->handle);
wmove (win_info->handle, 0, 0);
for (i = 1; i < win_info->width; i++)
waddch (win_info->handle, ' ');
wmove (win_info->handle, 0, 0);
if (data->content)
waddstr (win_info->handle, data->content);
if (data->highlight)
/* We ignore the return value, casting it to void in order to avoid
a compiler warning. The warning itself was introduced by a patch
to ncurses 5.7 dated 2009-08-29, changing this macro to expand
to code that causes the compiler to generate an unused-value
warning. */
(void) wstandend (win_info->handle);
tui_refresh_win (win_info);
}
}
static void
tui_reg_next_command (char *arg, int from_tty)
{
struct gdbarch *gdbarch = get_current_arch ();
if (TUI_DATA_WIN != NULL)
{
struct reggroup *group
= TUI_DATA_WIN->detail.data_display_info.current_group;
group = reggroup_next (gdbarch, group);
if (group == NULL)
group = reggroup_next (gdbarch, NULL);
if (group != NULL)
tui_show_registers (group);
}
}
/* Implementation of the "tui reg prev" command. Cycle the register group
displayed in the tui REG window, moving backwards through the list of
available register groups. */
static void
tui_reg_prev_command (char *arg, int from_tty)
{
struct gdbarch *gdbarch = get_current_arch ();
if (TUI_DATA_WIN != NULL)
{
struct reggroup *group
= TUI_DATA_WIN->detail.data_display_info.current_group;
group = reggroup_prev (gdbarch, group);
if (group == NULL)
group = reggroup_prev (gdbarch, NULL);
if (group != NULL)
tui_show_registers (group);
}
}
static void
tui_reg_float_command (char *arg, int from_tty)
{
tui_show_registers (float_reggroup);
}
static void
tui_reg_general_command (char *arg, int from_tty)
{
tui_show_registers (general_reggroup);
}
static void
tui_reg_system_command (char *arg, int from_tty)
{
tui_show_registers (system_reggroup);
}
static struct cmd_list_element *tuireglist;
static void
tui_reg_command (char *args, int from_tty)
{
printf_unfiltered (_("\"tui reg\" must be followed by the name of a "
"tui reg command.\n"));
help_list (tuireglist, "tui reg ", all_commands, gdb_stdout);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
extern initialize_file_ftype _initialize_tui_regs;
void
_initialize_tui_regs (void)
{
struct cmd_list_element **tuicmd;
tuicmd = tui_get_cmd_list ();
add_prefix_cmd ("reg", class_tui, tui_reg_command,
_("TUI commands to control the register window."),
&tuireglist, "tui reg ", 0,
tuicmd);
add_cmd ("float", class_tui, tui_reg_float_command,
_("Display only floating point registers."),
&tuireglist);
add_cmd ("general", class_tui, tui_reg_general_command,
_("Display only general registers."),
&tuireglist);
add_cmd ("system", class_tui, tui_reg_system_command,
_("Display only system registers."),
&tuireglist);
add_cmd ("next", class_tui, tui_reg_next_command,
_("Display next register group."),
&tuireglist);
add_cmd ("prev", class_tui, tui_reg_prev_command,
_("Display previous register group."),
&tuireglist);
}
/*****************************************
** STATIC LOCAL FUNCTIONS **
******************************************/
static void
tui_restore_gdbout (void *ui)
{
ui_file_delete (gdb_stdout);
gdb_stdout = (struct ui_file*) ui;
pagination_enabled = 1;
}
/* Get the register from the frame and return a printable
representation of it. */
static char *
tui_register_format (struct frame_info *frame, int regnum)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
struct ui_file *stream;
struct ui_file *old_stdout;
struct cleanup *cleanups;
char *p, *s;
char *ret;
pagination_enabled = 0;
old_stdout = gdb_stdout;
stream = tui_sfileopen (256);
gdb_stdout = stream;
cleanups = make_cleanup (tui_restore_gdbout, (void*) old_stdout);
gdbarch_print_registers_info (gdbarch, stream, frame, regnum, 1);
/* Save formatted output in the buffer. */
p = tui_file_get_strbuf (stream);
/* Remove the possible \n. */
s = strrchr (p, '\n');
if (s && s[1] == 0)
*s = 0;
/* Expand tabs into spaces, since ncurses on MS-Windows doesn't. */
ret = tui_expand_tabs (p, 0);
do_cleanups (cleanups);
return ret;
}
/* Get the register value from the given frame and format it for the
display. When changep is set, check if the new register value has
changed with respect to the previous call. */
static enum tui_status
tui_get_register (struct frame_info *frame,
struct tui_data_element *data,
int regnum, int *changedp)
{
enum tui_status ret = TUI_FAILURE;
if (changedp)
*changedp = FALSE;
if (target_has_registers)
{
char *prev_content = data->content;
data->content = tui_register_format (frame, regnum);
if (changedp != NULL
&& strcmp (prev_content, data->content) != 0)
*changedp = 1;
xfree (prev_content);
ret = TUI_SUCCESS;
}
return ret;
}
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