/home/stan/gdb/src/gdb/tui/tui-stack.c

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/* TUI display locator.

   Copyright (C) 1998-2013 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 "symtab.h"
#include "breakpoint.h"
#include "frame.h"
#include "command.h"
#include "inferior.h"
#include "target.h"
#include "top.h"
#include "gdb-demangle.h"
#include "gdb_string.h"
#include "source.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 full_name portion of the locator.  */
static void tui_set_locator_fullname (const char *fullname);

/* Update the locator, with the provided arguments.  */
static void tui_set_locator_info (struct gdbarch *gdbarch,
                                  const char *fullname,
                                  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)
    xsnprintf (line_buf, sizeof (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);
  fputs_filtered (loc->gdbarch? paddress (loc->gdbarch, loc->addr) : "??",
                  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_arch (fi), 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) - 1);
  name[sizeof (name) - 1] = 0;
  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);
      /* We ignore the return value from wstandout and wstandend, casting
         them 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 these macro to expand to code that causes the compiler
         to generate an unused-value warning.  */
      (void) wstandout (locator->handle);
      waddstr (locator->handle, string);
      wclrtoeol (locator->handle);
      (void) 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_fullname (const char *fullname)
{
  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 (NULL, fullname, NULL, 0, 0);
      return;
    }

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

/* Update the locator, with the provided arguments.  */
static void
tui_set_locator_info (struct gdbarch *gdbarch,
                      const char *fullname,
                      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;
  element->gdbarch = gdbarch;
  tui_set_locator_fullname (fullname);
}

/* Update only the full_name portion of the locator.  */
void
tui_update_locator_fullname (const char *fullname)
{
  tui_set_locator_fullname (fullname);
  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;
      CORE_ADDR pc;

      find_frame_sal (fi, &sal);

      source_already_displayed = sal.symtab != 0
        && tui_source_is_displayed (symtab_to_fullname (sal.symtab));

      if (get_frame_pc_if_available (fi, &pc))
        tui_set_locator_info (get_frame_arch (fi),
                              (sal.symtab == 0
                               ? "??" : symtab_to_fullname (sal.symtab)),
                              tui_get_function_from_frame (fi),
                              sal.line,
                              pc);
      else
        tui_set_locator_info (get_frame_arch (fi),
                              "??", _("<unavailable>"), sal.line, 0);

      tui_show_locator_content ();
      start_line = 0;
      for (i = 0; i < (tui_source_windows ())->count; i++)
        {
          union tui_which_element *item;

          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),
                                            (const char **) NULL,
                                            &low, (CORE_ADDR) 0) == 0)
                {
                  /* There is no symbol available for current PC.  There is no
                     safe way how to "disassemble backwards".  */
                  low = get_frame_pc (fi);
                }
              else
                low = tui_get_low_disassembly_address (get_frame_arch (fi),
                                                       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, get_frame_arch (fi),
                                          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, get_frame_arch (fi),
                                              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, NULL, 0, (CORE_ADDR) 0);
      tui_show_locator_content ();
      for (i = 0; i < (tui_source_windows ())->count; i++)
        {
          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.  */

/* Provide a prototype to silence -Wmissing-prototypes.  */
extern initialize_file_ftype _initialize_tui_stack;

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);
}