gdb-6.4/gdb/tui/tui-stack.c - toolchain/gdb - Git at Google

 /* TUI display locator.

    Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 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 2 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, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */

 #include "defs.h"
 #include "symtab.h"
 #include "breakpoint.h"
 #include "frame.h"
 #include "command.h"
 #include "inferior.h"
 #include "target.h"
 #include "top.h"
 #include "gdb_string.h"
 #include "tui/tui.h"
 #include "tui/tui-data.h"
 #include "tui/tui-stack.h"
 #include "tui/tui-wingeneral.h"
 #include "tui/tui-source.h"
 #include "tui/tui-winsource.h"
 #include "tui/tui-file.h"

 #include "gdb_curses.h"

 /* Get a printable name for the function at the address.
    The symbol name is demangled if demangling is turned on.
    Returns a pointer to a static area holding the result.  */
 static char* tui_get_function_from_frame (struct frame_info *fi);

 /* Set the filename portion of the locator.  */
 static void tui_set_locator_filename (const char *filename);

 /* Update the locator, with the provided arguments.  */
 static void tui_set_locator_info (const char *filename, const char *procname,
                                   int lineno, CORE_ADDR addr);

 static void tui_update_command (char *, int);


 /* Create the status line to display as much information as we
    can on this single line: target name, process number, current
    function, current line, current PC, SingleKey mode.  */
 static char*
 tui_make_status_line (struct tui_locator_element* loc)
 {
   char* string;
   char line_buf[50], *pname;
   char* buf;
   int status_size;
   int i, proc_width;
   const char* pid_name;
   const char* pc_buf;
   int target_width;
   int pid_width;
   int line_width;
   int pc_width;
   struct ui_file *pc_out;

   if (ptid_equal (inferior_ptid, null_ptid))
     pid_name = "No process";
   else
     pid_name = target_pid_to_str (inferior_ptid);

   target_width = strlen (target_shortname);
   if (target_width > MAX_TARGET_WIDTH)
     target_width = MAX_TARGET_WIDTH;

   pid_width = strlen (pid_name);
   if (pid_width > MAX_PID_WIDTH)
     pid_width = MAX_PID_WIDTH;

   status_size = tui_term_width ();
   string = (char *) xmalloc (status_size + 1);
   buf = (char*) alloca (status_size + 1);

   /* Translate line number and obtain its size.  */
   if (loc->line_no > 0)
     sprintf (line_buf, "%d", loc->line_no);
   else
     strcpy (line_buf, "??");
   line_width = strlen (line_buf);
   if (line_width < MIN_LINE_WIDTH)
     line_width = MIN_LINE_WIDTH;

   /* Translate PC address.  */
   pc_out = tui_sfileopen (128);
   deprecated_print_address_numeric (loc->addr, 1, pc_out);
   pc_buf = tui_file_get_strbuf (pc_out);
   pc_width = strlen (pc_buf);

   /* First determine the amount of proc name width we have available.
      The +1 are for a space separator between fields.
      The -1 are to take into account the \0 counted by sizeof.  */
   proc_width = (status_size
                 - (target_width + 1)
                 - (pid_width + 1)
                 - (sizeof (PROC_PREFIX) - 1 + 1)
                 - (sizeof (LINE_PREFIX) - 1 + line_width + 1)
                 - (sizeof (PC_PREFIX) - 1 + pc_width + 1)
                 - (tui_current_key_mode == TUI_SINGLE_KEY_MODE
                    ? (sizeof (SINGLE_KEY) - 1 + 1)
                    : 0));

   /* If there is no room to print the function name, try by removing
      some fields.  */
   if (proc_width < MIN_PROC_WIDTH)
     {
       proc_width += target_width + 1;
       target_width = 0;
       if (proc_width < MIN_PROC_WIDTH)
         {
           proc_width += pid_width + 1;
           pid_width = 0;
           if (proc_width <= MIN_PROC_WIDTH)
             {
               proc_width += pc_width + sizeof (PC_PREFIX) - 1 + 1;
               pc_width = 0;
               if (proc_width < 0)
                 {
                   proc_width += line_width + sizeof (LINE_PREFIX) - 1 + 1;
                   line_width = 0;
                   if (proc_width < 0)
                     proc_width = 0;
                 }
             }
         }
     }

   /* Now convert elements to string form */
   pname = loc->proc_name;

   /* Now create the locator line from the string version
      of the elements.  We could use sprintf() here but
      that wouldn't ensure that we don't overrun the size
      of the allocated buffer.  strcat_to_buf() will.  */
   *string = (char) 0;

   if (target_width > 0)
     {
       sprintf (buf, "%*.*s ",
                -target_width, target_width, target_shortname);
       strcat_to_buf (string, status_size, buf);
     }
   if (pid_width > 0)
     {
       sprintf (buf, "%*.*s ",
                -pid_width, pid_width, pid_name);
       strcat_to_buf (string, status_size, buf);
     }

   /* Show whether we are in SingleKey mode.  */
   if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
     {
       strcat_to_buf (string, status_size, SINGLE_KEY);
       strcat_to_buf (string, status_size, " ");
     }

   /* procedure/class name */
   if (proc_width > 0)
     {
       if (strlen (pname) > proc_width)
         sprintf (buf, "%s%*.*s* ", PROC_PREFIX,
                  1 - proc_width, proc_width - 1, pname);
       else
         sprintf (buf, "%s%*.*s ", PROC_PREFIX,
                  -proc_width, proc_width, pname);
       strcat_to_buf (string, status_size, buf);
     }

   if (line_width > 0)
     {
       sprintf (buf, "%s%*.*s ", LINE_PREFIX,
                -line_width, line_width, line_buf);
       strcat_to_buf (string, status_size, buf);
     }
   if (pc_width > 0)
     {
       strcat_to_buf (string, status_size, PC_PREFIX);
       strcat_to_buf (string, status_size, pc_buf);
     }


   for (i = strlen (string); i < status_size; i++)
     string[i] = ' ';
   string[status_size] = (char) 0;

   ui_file_delete (pc_out);
   return string;
 }

 /* Get a printable name for the function at the address.
    The symbol name is demangled if demangling is turned on.
    Returns a pointer to a static area holding the result.  */
 static char*
 tui_get_function_from_frame (struct frame_info *fi)
 {
   static char name[256];
   struct ui_file *stream = tui_sfileopen (256);
   char *p;

   print_address_symbolic (get_frame_pc (fi), stream, demangle, "");
   p = tui_file_get_strbuf (stream);

   /* Use simple heuristics to isolate the function name.  The symbol can
      be demangled and we can have function parameters.  Remove them because
      the status line is too short to display them.  */
   if (*p == '<')
     p++;
   strncpy (name, p, sizeof (name));
   p = strchr (name, '(');
   if (!p)
     p = strchr (name, '>');
   if (p)
     *p = 0;
   p = strchr (name, '+');
   if (p)
     *p = 0;
   ui_file_delete (stream);
   return name;
 }

 void
 tui_show_locator_content (void)
 {
   char *string;
   struct tui_gen_win_info * locator;

   locator = tui_locator_win_info_ptr ();

   if (locator != NULL && locator->handle != (WINDOW *) NULL)
     {
       struct tui_win_element * element;

       element = (struct tui_win_element *) locator->content[0];

       string = tui_make_status_line (&element->which_element.locator);
       wmove (locator->handle, 0, 0);
       wstandout (locator->handle);
       waddstr (locator->handle, string);
       wclrtoeol (locator->handle);
       wstandend (locator->handle);
       tui_refresh_win (locator);
       wmove (locator->handle, 0, 0);
       xfree (string);
       locator->content_in_use = TRUE;
     }
 }


 /* Set the filename portion of the locator.  */
 static void
 tui_set_locator_filename (const char *filename)
 {
   struct tui_gen_win_info * locator = tui_locator_win_info_ptr ();
   struct tui_locator_element * element;

   if (locator->content[0] == NULL)
     {
       tui_set_locator_info (filename, NULL, 0, 0);
       return;
     }

   element = &((struct tui_win_element *) locator->content[0])->which_element.locator;
   element->file_name[0] = 0;
   strcat_to_buf (element->file_name, MAX_LOCATOR_ELEMENT_LEN, filename);
 }

 /* Update the locator, with the provided arguments.  */
 static void
 tui_set_locator_info (const char *filename, const char *procname, int lineno,
                       CORE_ADDR addr)
 {
   struct tui_gen_win_info * locator = tui_locator_win_info_ptr ();
   struct tui_locator_element * element;

   /* Allocate the locator content if necessary.  */
   if (locator->content_size <= 0)
     {
       locator->content = (void **) tui_alloc_content (1, locator->type);
       locator->content_size = 1;
     }

   element = &((struct tui_win_element *) locator->content[0])->which_element.locator;
   element->proc_name[0] = (char) 0;
   strcat_to_buf (element->proc_name, MAX_LOCATOR_ELEMENT_LEN, procname);
   element->line_no = lineno;
   element->addr = addr;
   tui_set_locator_filename (filename);
 }

 /* Update only the filename portion of the locator.  */
 void
 tui_update_locator_filename (const char *filename)
 {
   tui_set_locator_filename (filename);
   tui_show_locator_content ();
 }

 /* Function to print the frame information for the TUI.  */
 void
 tui_show_frame_info (struct frame_info *fi)
 {
   struct tui_win_info * win_info;
   int i;

   if (fi)
     {
       int start_line, i;
       CORE_ADDR low;
       struct tui_gen_win_info * locator = tui_locator_win_info_ptr ();
       int source_already_displayed;
       struct symtab_and_line sal;

       find_frame_sal (fi, &sal);

       source_already_displayed = sal.symtab != 0
         && tui_source_is_displayed (sal.symtab->filename);
       tui_set_locator_info (sal.symtab == 0 ? "??" : sal.symtab->filename,
                             tui_get_function_from_frame (fi),
                             sal.line,
                             get_frame_pc (fi));
       tui_show_locator_content ();
       start_line = 0;
       for (i = 0; i < (tui_source_windows ())->count; i++)
 	{
 	  union tui_which_element *item;
 	  win_info = (struct tui_win_info *) (tui_source_windows ())->list[i];

 	  item = &((struct tui_win_element *) locator->content[0])->which_element;
 	  if (win_info == TUI_SRC_WIN)
 	    {
 	      start_line = (item->locator.line_no -
 			   (win_info->generic.viewport_height / 2)) + 1;
 	      if (start_line <= 0)
 		start_line = 1;
 	    }
 	  else
 	    {
 	      if (find_pc_partial_function (get_frame_pc (fi), (char **) NULL,
 					    &low, (CORE_ADDR) NULL) == 0)
 		error (_("No function contains program counter for selected frame."));
 	      else
 		low = tui_get_low_disassembly_address (low, get_frame_pc (fi));
 	    }

 	  if (win_info == TUI_SRC_WIN)
 	    {
 	      struct tui_line_or_address l;
 	      l.loa = LOA_LINE;
 	      l.u.line_no = start_line;
 	      if (!(source_already_displayed
 		    && tui_line_is_displayed (item->locator.line_no, win_info, TRUE)))
 		tui_update_source_window (win_info, sal.symtab, l, TRUE);
 	      else
 		{
 		  l.u.line_no = item->locator.line_no;
 		  tui_set_is_exec_point_at (l, win_info);
 		}
 	    }
 	  else
 	    {
 	      if (win_info == TUI_DISASM_WIN)
 		{
 		  struct tui_line_or_address a;
 		  a.loa = LOA_ADDRESS;
 		  a.u.addr = low;
 		  if (!tui_addr_is_displayed (item->locator.addr, win_info, TRUE))
 		    tui_update_source_window (win_info, sal.symtab, a, TRUE);
 		  else
 		    {
 		      a.u.addr = item->locator.addr;
 		      tui_set_is_exec_point_at (a, win_info);
 		    }
 		}
 	    }
 	  tui_update_exec_info (win_info);
 	}
     }
   else
     {
       tui_set_locator_info (NULL, NULL, 0, (CORE_ADDR) 0);
       tui_show_locator_content ();
       for (i = 0; i < (tui_source_windows ())->count; i++)
 	{
 	  win_info = (struct tui_win_info *) (tui_source_windows ())->list[i];
 	  tui_clear_source_content (win_info, EMPTY_SOURCE_PROMPT);
 	  tui_update_exec_info (win_info);
 	}
     }
 }

 /* Function to initialize gdb commands, for tui window stack
    manipulation.  */
 void
 _initialize_tui_stack (void)
 {
   add_com ("update", class_tui, tui_update_command, _("\
 Update the source window and locator to display the current execution point.\n"));
 }

 /* Command to update the display with the current execution point.  */
 static void
 tui_update_command (char *arg, int from_tty)
 {
   char cmd[sizeof("frame 0")];

   strcpy (cmd, "frame 0");
   execute_command (cmd, from_tty);
 }
	/* TUI display locator.

	Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 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 2 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, write to the Free Software
	Foundation, Inc., 59 Temple Place - Suite 330,
	Boston, MA 02111-1307, USA. */

	#include "defs.h"
	#include "symtab.h"
	#include "breakpoint.h"
	#include "frame.h"
	#include "command.h"
	#include "inferior.h"
	#include "target.h"
	#include "top.h"
	#include "gdb_string.h"
	#include "tui/tui.h"
	#include "tui/tui-data.h"
	#include "tui/tui-stack.h"
	#include "tui/tui-wingeneral.h"
	#include "tui/tui-source.h"
	#include "tui/tui-winsource.h"
	#include "tui/tui-file.h"

	#include "gdb_curses.h"

	/* Get a printable name for the function at the address.
	The symbol name is demangled if demangling is turned on.
	Returns a pointer to a static area holding the result. */
	static char* tui_get_function_from_frame (struct frame_info *fi);

	/* Set the filename portion of the locator. */
	static void tui_set_locator_filename (const char *filename);

	/* Update the locator, with the provided arguments. */
	static void tui_set_locator_info (const char filename, const char procname,
	int lineno, CORE_ADDR addr);

	static void tui_update_command (char *, int);


	/* Create the status line to display as much information as we
	can on this single line: target name, process number, current
	function, current line, current PC, SingleKey mode. */
	static char*
	tui_make_status_line (struct tui_locator_element* loc)
	{
	char* string;
	char line_buf[50], *pname;
	char* buf;
	int status_size;
	int i, proc_width;
	const char* pid_name;
	const char* pc_buf;
	int target_width;
	int pid_width;
	int line_width;
	int pc_width;
	struct ui_file *pc_out;

	if (ptid_equal (inferior_ptid, null_ptid))
	pid_name = "No process";
	else
	pid_name = target_pid_to_str (inferior_ptid);

	target_width = strlen (target_shortname);
	if (target_width > MAX_TARGET_WIDTH)
	target_width = MAX_TARGET_WIDTH;

	pid_width = strlen (pid_name);
	if (pid_width > MAX_PID_WIDTH)
	pid_width = MAX_PID_WIDTH;

	status_size = tui_term_width ();
	string = (char *) xmalloc (status_size + 1);
	buf = (char*) alloca (status_size + 1);

	/* Translate line number and obtain its size. */
	if (loc->line_no > 0)
	sprintf (line_buf, "%d", loc->line_no);
	else
	strcpy (line_buf, "??");
	line_width = strlen (line_buf);
	if (line_width < MIN_LINE_WIDTH)
	line_width = MIN_LINE_WIDTH;

	/* Translate PC address. */
	pc_out = tui_sfileopen (128);
	deprecated_print_address_numeric (loc->addr, 1, pc_out);
	pc_buf = tui_file_get_strbuf (pc_out);
	pc_width = strlen (pc_buf);

	/* First determine the amount of proc name width we have available.
	The +1 are for a space separator between fields.
	The -1 are to take into account the \0 counted by sizeof. */
	proc_width = (status_size
	- (target_width + 1)
	- (pid_width + 1)
	- (sizeof (PROC_PREFIX) - 1 + 1)
	- (sizeof (LINE_PREFIX) - 1 + line_width + 1)
	- (sizeof (PC_PREFIX) - 1 + pc_width + 1)
	- (tui_current_key_mode == TUI_SINGLE_KEY_MODE
	? (sizeof (SINGLE_KEY) - 1 + 1)
	: 0));

	/* If there is no room to print the function name, try by removing
	some fields. */
	if (proc_width < MIN_PROC_WIDTH)
	{
	proc_width += target_width + 1;
	target_width = 0;
	if (proc_width < MIN_PROC_WIDTH)
	{
	proc_width += pid_width + 1;
	pid_width = 0;
	if (proc_width <= MIN_PROC_WIDTH)
	{
	proc_width += pc_width + sizeof (PC_PREFIX) - 1 + 1;
	pc_width = 0;
	if (proc_width < 0)
	{
	proc_width += line_width + sizeof (LINE_PREFIX) - 1 + 1;
	line_width = 0;
	if (proc_width < 0)
	proc_width = 0;
	}
	}
	}
	}

	/* Now convert elements to string form */
	pname = loc->proc_name;

	/* Now create the locator line from the string version
	of the elements. We could use sprintf() here but
	that wouldn't ensure that we don't overrun the size
	of the allocated buffer. strcat_to_buf() will. */
	*string = (char) 0;

	if (target_width > 0)
	{
	sprintf (buf, "%.s ",
	-target_width, target_width, target_shortname);
	strcat_to_buf (string, status_size, buf);
	}
	if (pid_width > 0)
	{
	sprintf (buf, "%.s ",
	-pid_width, pid_width, pid_name);
	strcat_to_buf (string, status_size, buf);
	}

	/* Show whether we are in SingleKey mode. */
	if (tui_current_key_mode == TUI_SINGLE_KEY_MODE)
	{
	strcat_to_buf (string, status_size, SINGLE_KEY);
	strcat_to_buf (string, status_size, " ");
	}

	/* procedure/class name */
	if (proc_width > 0)
	{
	if (strlen (pname) > proc_width)
	sprintf (buf, "%s%.s* ", PROC_PREFIX,
	1 - proc_width, proc_width - 1, pname);
	else
	sprintf (buf, "%s%.s ", PROC_PREFIX,
	-proc_width, proc_width, pname);
	strcat_to_buf (string, status_size, buf);
	}

	if (line_width > 0)
	{
	sprintf (buf, "%s%.s ", LINE_PREFIX,
	-line_width, line_width, line_buf);
	strcat_to_buf (string, status_size, buf);
	}
	if (pc_width > 0)
	{
	strcat_to_buf (string, status_size, PC_PREFIX);
	strcat_to_buf (string, status_size, pc_buf);
	}


	for (i = strlen (string); i < status_size; i++)
	string[i] = ' ';
	string[status_size] = (char) 0;

	ui_file_delete (pc_out);
	return string;
	}

	/* Get a printable name for the function at the address.
	The symbol name is demangled if demangling is turned on.
	Returns a pointer to a static area holding the result. */
	static char*
	tui_get_function_from_frame (struct frame_info *fi)
	{
	static char name[256];
	struct ui_file *stream = tui_sfileopen (256);
	char *p;

	print_address_symbolic (get_frame_pc (fi), stream, demangle, "");
	p = tui_file_get_strbuf (stream);

	/* Use simple heuristics to isolate the function name. The symbol can
	be demangled and we can have function parameters. Remove them because
	the status line is too short to display them. */
	if (*p == '<')
	p++;
	strncpy (name, p, sizeof (name));
	p = strchr (name, '(');
	if (!p)
	p = strchr (name, '>');
	if (p)
	*p = 0;
	p = strchr (name, '+');
	if (p)
	*p = 0;
	ui_file_delete (stream);
	return name;
	}

	void
	tui_show_locator_content (void)
	{
	char *string;
	struct tui_gen_win_info * locator;

	locator = tui_locator_win_info_ptr ();

	if (locator != NULL && locator->handle != (WINDOW *) NULL)
	{
	struct tui_win_element * element;

	element = (struct tui_win_element *) locator->content[0];

	string = tui_make_status_line (&element->which_element.locator);
	wmove (locator->handle, 0, 0);
	wstandout (locator->handle);
	waddstr (locator->handle, string);
	wclrtoeol (locator->handle);
	wstandend (locator->handle);
	tui_refresh_win (locator);
	wmove (locator->handle, 0, 0);
	xfree (string);
	locator->content_in_use = TRUE;
	}
	}


	/* Set the filename portion of the locator. */
	static void
	tui_set_locator_filename (const char *filename)
	{
	struct tui_gen_win_info * locator = tui_locator_win_info_ptr ();
	struct tui_locator_element * element;

	if (locator->content[0] == NULL)
	{
	tui_set_locator_info (filename, NULL, 0, 0);
	return;
	}

	element = &((struct tui_win_element *) locator->content[0])->which_element.locator;
	element->file_name[0] = 0;
	strcat_to_buf (element->file_name, MAX_LOCATOR_ELEMENT_LEN, filename);
	}

	/* Update the locator, with the provided arguments. */
	static void
	tui_set_locator_info (const char filename, const char procname, int lineno,
	CORE_ADDR addr)
	{
	struct tui_gen_win_info * locator = tui_locator_win_info_ptr ();
	struct tui_locator_element * element;

	/* Allocate the locator content if necessary. */
	if (locator->content_size <= 0)
	{
	locator->content = (void **) tui_alloc_content (1, locator->type);
	locator->content_size = 1;
	}

	element = &((struct tui_win_element *) locator->content[0])->which_element.locator;
	element->proc_name[0] = (char) 0;
	strcat_to_buf (element->proc_name, MAX_LOCATOR_ELEMENT_LEN, procname);
	element->line_no = lineno;
	element->addr = addr;
	tui_set_locator_filename (filename);
	}

	/* Update only the filename portion of the locator. */
	void
	tui_update_locator_filename (const char *filename)
	{
	tui_set_locator_filename (filename);
	tui_show_locator_content ();
	}

	/* Function to print the frame information for the TUI. */
	void
	tui_show_frame_info (struct frame_info *fi)
	{
	struct tui_win_info * win_info;
	int i;

	if (fi)
	{
	int start_line, i;
	CORE_ADDR low;
	struct tui_gen_win_info * locator = tui_locator_win_info_ptr ();
	int source_already_displayed;
	struct symtab_and_line sal;

	find_frame_sal (fi, &sal);

	source_already_displayed = sal.symtab != 0
	&& tui_source_is_displayed (sal.symtab->filename);
	tui_set_locator_info (sal.symtab == 0 ? "??" : sal.symtab->filename,
	tui_get_function_from_frame (fi),
	sal.line,
	get_frame_pc (fi));
	tui_show_locator_content ();
	start_line = 0;
	for (i = 0; i < (tui_source_windows ())->count; i++)
	{
	union tui_which_element *item;
	win_info = (struct tui_win_info *) (tui_source_windows ())->list[i];

	item = &((struct tui_win_element *) locator->content[0])->which_element;
	if (win_info == TUI_SRC_WIN)
	{
	start_line = (item->locator.line_no -
	(win_info->generic.viewport_height / 2)) + 1;
	if (start_line <= 0)
	start_line = 1;
	}
	else
	{
	if (find_pc_partial_function (get_frame_pc (fi), (char **) NULL,
	&low, (CORE_ADDR) NULL) == 0)
	error (_("No function contains program counter for selected frame."));
	else
	low = tui_get_low_disassembly_address (low, get_frame_pc (fi));
	}

	if (win_info == TUI_SRC_WIN)
	{
	struct tui_line_or_address l;
	l.loa = LOA_LINE;
	l.u.line_no = start_line;
	if (!(source_already_displayed
	&& tui_line_is_displayed (item->locator.line_no, win_info, TRUE)))
	tui_update_source_window (win_info, sal.symtab, l, TRUE);
	else
	{
	l.u.line_no = item->locator.line_no;
	tui_set_is_exec_point_at (l, win_info);
	}
	}
	else
	{
	if (win_info == TUI_DISASM_WIN)
	{
	struct tui_line_or_address a;
	a.loa = LOA_ADDRESS;
	a.u.addr = low;
	if (!tui_addr_is_displayed (item->locator.addr, win_info, TRUE))
	tui_update_source_window (win_info, sal.symtab, a, TRUE);
	else
	{
	a.u.addr = item->locator.addr;
	tui_set_is_exec_point_at (a, win_info);
	}
	}
	}
	tui_update_exec_info (win_info);
	}
	}
	else
	{
	tui_set_locator_info (NULL, NULL, 0, (CORE_ADDR) 0);
	tui_show_locator_content ();
	for (i = 0; i < (tui_source_windows ())->count; i++)
	{
	win_info = (struct tui_win_info *) (tui_source_windows ())->list[i];
	tui_clear_source_content (win_info, EMPTY_SOURCE_PROMPT);
	tui_update_exec_info (win_info);
	}
	}
	}

	/* Function to initialize gdb commands, for tui window stack
	manipulation. */
	void
	_initialize_tui_stack (void)
	{
	add_com ("update", class_tui, tui_update_command, _("\
	Update the source window and locator to display the current execution point.\n"));
	}

	/* Command to update the display with the current execution point. */
	static void
	tui_update_command (char *arg, int from_tty)
	{
	char cmd[sizeof("frame 0")];

	strcpy (cmd, "frame 0");
	execute_command (cmd, from_tty);
	}