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/* TUI display registers in window.

   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008

   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 "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 "gdb_string.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 "reggroups.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 gdbarch *gdbarch,

                         struct reggroup *group,

                         struct frame_info *frame,

                         int refresh_values_only);

static enum tui_status

tui_get_register (struct gdbarch *gdbarch,

                  struct frame_info *frame,

                  struct tui_data_element *data,

                  int regnum, int *changedp);

static void tui_register_format (struct gdbarch *,

                                 struct frame_info *,

                                 struct tui_data_element*,

                                 int);

static void tui_scroll_regs_forward_command (char *, int);

static void tui_scroll_regs_backward_command (char *, int);

/*****************************************

** 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);

}

/* Answer the index of the last element in line_no.  If line_no is

   past the register area (-1) is returned.  */

int

tui_last_reg_element_no_in_line (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) - 1;

  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_for_display_command (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 (current_gdbarch, group,

                                     get_current_frame (),

                                     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 = (struct tui_win_element *) 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 gdbarch *gdbarch,

                         struct reggroup *group,

                         struct frame_info *frame,

                         int refresh_values_only)

{

  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 (current_gdbarch)

                + gdbarch_num_pseudo_regs (current_gdbarch);

       regnum++)

    {

      /* Must be in the group and have a name.  */

      if (gdbarch_register_reggroup_p (gdbarch, regnum, group)

          && gdbarch_register_name (gdbarch, regnum) != 0)

        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 (current_gdbarch)

                    + gdbarch_num_pseudo_regs (current_gdbarch);

           regnum++)

        {

          struct tui_gen_win_info *data_item_win;

          struct tui_data_element *data;

          const char *name;

          if (!gdbarch_register_reggroup_p (gdbarch, regnum, group))

            continue;

          name = gdbarch_register_name (gdbarch, regnum);

          if (name == 0)

            continue;

          data_item_win =

            &display_info->regs_content[pos]->which_element.data_window;

          data =

            &((struct tui_win_element *) data_item_win->content[0])->which_element.data;

          if (data)

            {

              if (!refresh_values_only)

                {

                  data->item_no = regnum;

                  data->name = name;

                  data->highlight = FALSE;

                }

              if (data->value == (void*) NULL)

                data->value = (void*) xmalloc (MAX_REGISTER_SIZE);

              tui_get_register (gdbarch, 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, value_chars_wide, 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 = &((struct tui_win_element *)

                   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 = &((struct tui_win_element *)

                                 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.  */

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, j;

          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 = &((struct tui_win_element *)

                       data_item_win_ptr->content[0])->which_element.data;

              was_hilighted = data->highlight;

              tui_get_register (current_gdbarch, 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)

        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)

        wstandend (win_info->handle);

      tui_refresh_win (win_info);

    }

}

static void

tui_reg_next_command (char *arg, int from_tty)

{

  if (TUI_DATA_WIN != 0)

    {

      struct reggroup *group

        = TUI_DATA_WIN->detail.data_display_info.current_group;

      group = reggroup_next (current_gdbarch, group);

      if (group == 0)

        group = reggroup_next (current_gdbarch, 0);

      if (group)

        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 ", -1, gdb_stdout);

}

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);

  if (xdb_commands)

    {

      add_com ("fr", class_tui, tui_reg_float_command,

               _("Display only floating point registers\n"));

      add_com ("gr", class_tui, tui_reg_general_command,

               _("Display only general registers\n"));

      add_com ("sr", class_tui, tui_reg_system_command,

               _("Display only special registers\n"));

      add_com ("+r", class_tui, tui_scroll_regs_forward_command,

               _("Scroll the registers window forward\n"));

      add_com ("-r", class_tui, tui_scroll_regs_backward_command,

               _("Scroll the register window backward\n"));

    }

}

/*****************************************

** STATIC LOCAL FUNCTIONS                 **

******************************************/

extern int pagination_enabled;

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 make a printable representation

   of it in the data element.  */

static void

tui_register_format (struct gdbarch *gdbarch,

                     struct frame_info *frame,

                     struct tui_data_element *data_element,

                     int regnum)

{

  struct ui_file *stream;

  struct ui_file *old_stdout;

  const char *name;

  struct cleanup *cleanups;

  char *p, *s;

  int pos;

  struct type *type = register_type (gdbarch, regnum);

  name = gdbarch_register_name (gdbarch, regnum);

  if (name == 0)

    {

      return;

    }

  pagination_enabled = 0;

  old_stdout = gdb_stdout;