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/* Disassembly display.

   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 "symtab.h"

#include "breakpoint.h"

#include "frame.h"

#include "value.h"

#include "source.h"

#include "disasm.h"

#include "gdb_string.h"

#include "tui/tui.h"

#include "tui/tui-data.h"

#include "tui/tui-win.h"

#include "tui/tui-layout.h"

#include "tui/tui-winsource.h"

#include "tui/tui-stack.h"

#include "tui/tui-file.h"

#include "gdb_curses.h"

struct tui_asm_line

{

  CORE_ADDR addr;

  char *addr_string;

  char *insn;

};

/* Function to set the disassembly window's content.

   Disassemble count lines starting at pc.

   Return address of the count'th instruction after pc.  */

static CORE_ADDR

tui_disassemble (struct tui_asm_line *asm_lines,

                 CORE_ADDR pc, int count)

{

  struct ui_file *gdb_dis_out;

  /* Now init the ui_file structure.  */

  gdb_dis_out = tui_sfileopen (256);

  /* Now construct each line.  */

  for (; count > 0; count--, asm_lines++)

    {

      if (asm_lines->addr_string)

        xfree (asm_lines->addr_string);

      if (asm_lines->insn)

        xfree (asm_lines->insn);

      print_address (pc, gdb_dis_out);

      asm_lines->addr = pc;

      asm_lines->addr_string = xstrdup (tui_file_get_strbuf (gdb_dis_out));

      ui_file_rewind (gdb_dis_out);

      pc = pc + gdb_print_insn (pc, gdb_dis_out, NULL);

      asm_lines->insn = xstrdup (tui_file_get_strbuf (gdb_dis_out));

      /* Reset the buffer to empty.  */

      ui_file_rewind (gdb_dis_out);

    }

  ui_file_delete (gdb_dis_out);

  return pc;

}

/* Find the disassembly address that corresponds to FROM lines above

   or below the PC.  Variable sized instructions are taken into

   account by the algorithm.  */

static CORE_ADDR

tui_find_disassembly_address (CORE_ADDR pc, int from)

{

  CORE_ADDR new_low;

  int max_lines;

  int i;

  struct tui_asm_line *asm_lines;

  max_lines = (from > 0) ? from : - from;

  if (max_lines <= 1)

     return pc;

  asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)

                                         * max_lines);

  memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);

  new_low = pc;

  if (from > 0)

    {

      tui_disassemble (asm_lines, pc, max_lines);

      new_low = asm_lines[max_lines - 1].addr;

    }

  else

    {

      CORE_ADDR last_addr;

      int pos;

      struct minimal_symbol *msymbol;

      /* Find backward an address which is a symbol and for which

         disassembling from that address will fill completely the

         window.  */

      pos = max_lines - 1;

      do {

         new_low -= 1 * max_lines;

         msymbol = lookup_minimal_symbol_by_pc_section (new_low, 0);

         if (msymbol)

            new_low = SYMBOL_VALUE_ADDRESS (msymbol);

         else

            new_low += 1 * max_lines;

         tui_disassemble (asm_lines, new_low, max_lines);

         last_addr = asm_lines[pos].addr;

      } while (last_addr > pc && msymbol);

      /* Scan forward disassembling one instruction at a time until

         the last visible instruction of the window matches the pc.

         We keep the disassembled instructions in the 'lines' window

         and shift it downward (increasing its addresses).  */

      if (last_addr < pc)

        do

          {

            CORE_ADDR next_addr;

            pos++;

            if (pos >= max_lines)

              pos = 0;

            next_addr = tui_disassemble (&asm_lines[pos], last_addr, 1);

            /* If there are some problems while disassembling exit.  */

            if (next_addr <= last_addr)

              break;

            last_addr = next_addr;

          } while (last_addr <= pc);

      pos++;

      if (pos >= max_lines)

         pos = 0;

      new_low = asm_lines[pos].addr;

    }

  for (i = 0; i < max_lines; i++)

    {

      xfree (asm_lines[i].addr_string);

      xfree (asm_lines[i].insn);

    }

  return new_low;

}

/* Function to set the disassembly window's content.  */

enum tui_status

tui_set_disassem_content (CORE_ADDR pc)

{

  enum tui_status ret = TUI_FAILURE;

  int i;

  int offset = TUI_DISASM_WIN->detail.source_info.horizontal_offset;

  int line_width, max_lines;

  CORE_ADDR cur_pc;

  struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();

  int tab_len = tui_default_tab_len ();

  struct tui_asm_line *asm_lines;

  int insn_pos;

  int addr_size, max_size;

  char *line;

  if (pc == 0)

    return TUI_FAILURE;

  ret = tui_alloc_source_buffer (TUI_DISASM_WIN);

  if (ret != TUI_SUCCESS)

    return ret;

  TUI_DISASM_WIN->detail.source_info.start_line_or_addr.loa = LOA_ADDRESS;

  TUI_DISASM_WIN->detail.source_info.start_line_or_addr.u.addr = pc;

  cur_pc = (CORE_ADDR)

    (((struct tui_win_element *) locator->content[0])->which_element.locator.addr);

  max_lines = TUI_DISASM_WIN->generic.height - 2;       /* Account for

                                                           hilite.  */

  /* Get temporary table that will hold all strings (addr & insn).  */

  asm_lines = (struct tui_asm_line*) alloca (sizeof (struct tui_asm_line)

                                         * max_lines);

  memset (asm_lines, 0, sizeof (struct tui_asm_line) * max_lines);

  line_width = TUI_DISASM_WIN->generic.width - 1;

  tui_disassemble (asm_lines, pc, max_lines);

  /* See what is the maximum length of an address and of a line.  */

  addr_size = 0;

  max_size = 0;

  for (i = 0; i < max_lines; i++)

    {

      size_t len = strlen (asm_lines[i].addr_string);

      if (len > addr_size)

        addr_size = len;

      len = strlen (asm_lines[i].insn) + tab_len;

      if (len > max_size)

        max_size = len;

    }

  max_size += addr_size + tab_len;

  /* Allocate memory to create each line.  */

  line = (char*) alloca (max_size);

  insn_pos = (1 + (addr_size / tab_len)) * tab_len;

  /* Now construct each line.  */

  for (i = 0; i < max_lines; i++)

    {

      struct tui_win_element *element;

      struct tui_source_element *src;

      int cur_len;

      element = (struct tui_win_element *) TUI_DISASM_WIN->generic.content[i];

      src = &element->which_element.source;

      strcpy (line, asm_lines[i].addr_string);

      cur_len = strlen (line);

      /* Add spaces to make the instructions start on the same

         column.  */

      while (cur_len < insn_pos)

        {

          strcat (line, " ");

          cur_len++;

        }

      strcat (line, asm_lines[i].insn);

      /* Now copy the line taking the offset into account.  */

      if (strlen (line) > offset)

        strcpy (src->line, &line[offset]);

      else

        src->line[0] = '\0';

      src->line_or_addr.loa = LOA_ADDRESS;

      src->line_or_addr.u.addr = asm_lines[i].addr;

      src->is_exec_point = asm_lines[i].addr == cur_pc;

      /* See whether there is a breakpoint installed.  */

      src->has_break = (!src->is_exec_point

                       && breakpoint_here_p (pc) != no_breakpoint_here);

      xfree (asm_lines[i].addr_string);

      xfree (asm_lines[i].insn);

    }

  TUI_DISASM_WIN->generic.content_size = i;

  return TUI_SUCCESS;

}

/* Function to display the disassembly window with disassembled code.  */

void

tui_show_disassem (CORE_ADDR start_addr)

{

  struct symtab *s = find_pc_symtab (start_addr);

  struct tui_win_info *win_with_focus = tui_win_with_focus ();

  struct tui_line_or_address val;

  val.loa = LOA_ADDRESS;

  val.u.addr = start_addr;

  tui_add_win_to_layout (DISASSEM_WIN);

  tui_update_source_window (TUI_DISASM_WIN, s, val, FALSE);

  /* If the focus was in the src win, put it in the asm win, if the

     source view isn't split.  */

  if (tui_current_layout () != SRC_DISASSEM_COMMAND

      && win_with_focus == TUI_SRC_WIN)

    tui_set_win_focus_to (TUI_DISASM_WIN);

  return;

}

/* Function to display the disassembly window.  */

void

tui_show_disassem_and_update_source (CORE_ADDR start_addr)

{

  struct symtab_and_line sal;

  tui_show_disassem (start_addr);

  if (tui_current_layout () == SRC_DISASSEM_COMMAND)

    {

      struct tui_line_or_address val;

      /* Update what is in the source window if it is displayed too,

         note that it follows what is in the disassembly window and

         visa-versa.  */

      sal = find_pc_line (start_addr, 0);

      val.loa = LOA_LINE;

      val.u.line_no = sal.line;

      tui_update_source_window (TUI_SRC_WIN, sal.symtab, val, TRUE);

      if (sal.symtab)

        {

          set_current_source_symtab_and_line (&sal);

          tui_update_locator_filename (sal.symtab->filename);

        }

      else

        tui_update_locator_filename ("?");

    }

  return;

}

CORE_ADDR

tui_get_begin_asm_address (void)

{

  struct tui_gen_win_info *locator;

  struct tui_locator_element *element;

  CORE_ADDR addr;

  locator = tui_locator_win_info_ptr ();

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

  if (element->addr == 0)

    {

      struct minimal_symbol *main_symbol;

      /* Find address of the start of program.

         Note: this should be language specific.  */

      main_symbol = lookup_minimal_symbol ("main", NULL, NULL);

      if (main_symbol == 0)

        main_symbol = lookup_minimal_symbol ("MAIN", NULL, NULL);

      if (main_symbol == 0)

        main_symbol = lookup_minimal_symbol ("_start", NULL, NULL);

      if (main_symbol)

        addr = SYMBOL_VALUE_ADDRESS (main_symbol);

      else

        addr = 0;

    }

  else                          /* The target is executing.  */

    addr = element->addr;

  return addr;

}

/* Determine what the low address will be to display in the TUI's

   disassembly window.  This may or may not be the same as the low

   address input.  */

CORE_ADDR

tui_get_low_disassembly_address (CORE_ADDR low,

                                 CORE_ADDR pc)

{

  int pos;

  /* Determine where to start the disassembly so that the pc is about

     in the middle of the viewport.  */

  pos = tui_default_win_viewport_height (DISASSEM_WIN, DISASSEM_COMMAND) / 2;

  pc = tui_find_disassembly_address (pc, -pos);

  if (pc < low)

    pc = low;

  return pc;

}

/* Scroll the disassembly forward or backward vertically.  */

void

tui_vertical_disassem_scroll (enum tui_scroll_direction scroll_direction,

                              int num_to_scroll)

{

  if (TUI_DISASM_WIN->generic.content != NULL)

    {

      CORE_ADDR pc;

      tui_win_content content;

      struct symtab *s;

      struct tui_line_or_address val;

      int max_lines, dir;

      struct symtab_and_line cursal = get_current_source_symtab_and_line ();

      content = (tui_win_content) TUI_DISASM_WIN->generic.content;

      if (cursal.symtab == (struct symtab *) NULL)

        s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL)));

      else

        s = cursal.symtab;

      /* Account for hilite.  */

      max_lines = TUI_DISASM_WIN->generic.height - 2;

      pc = content[0]->which_element.source.line_or_addr.u.addr;

      dir = (scroll_direction == FORWARD_SCROLL) ? max_lines : - max_lines;

      val.loa = LOA_ADDRESS;

      val.u.addr = tui_find_disassembly_address (pc, dir);

      tui_update_source_window_as_is (TUI_DISASM_WIN, s, val, FALSE);

    }

}