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/* Disassembly display.

   Copyright 1998, 1999, 2000, 2001, 2002 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.  */

/* FIXME: cagney/2002-02-28: The GDB coding standard indicates that

   "defs.h" should be included first.  Unfortunatly some systems

   (currently Debian GNU/Linux) include the <stdbool.h> via <curses.h>

   and they clash with "bfd.h"'s definiton of true/false.  The correct

   fix is to remove true/false from "bfd.h", however, until that

   happens, hack around it by including "config.h" and <curses.h>

   first.  */

#include "config.h"

#ifdef HAVE_NCURSES_H       

#include <ncurses.h>

#else

#ifdef HAVE_CURSES_H

#include <curses.h>

#endif

#endif

#include "defs.h"

#include "symtab.h"

#include "breakpoint.h"

#include "frame.h"

#include "value.h"

#include "tui.h"

#include "tuiData.h"

#include "tuiWin.h"

#include "tuiLayout.h"

#include "tuiSourceWin.h"

#include "tuiStack.h"

#include "tui-file.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* lines, CORE_ADDR pc, int count)

{

  struct ui_file *gdb_dis_out;

  disassemble_info asm_info;

  /* now init the ui_file structure */

  gdb_dis_out = tui_sfileopen (256);

  memcpy (&asm_info, TARGET_PRINT_INSN_INFO, sizeof (asm_info));

  asm_info.stream = gdb_dis_out;

  if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)

    asm_info.endian = BFD_ENDIAN_BIG;

  else

    asm_info.endian = BFD_ENDIAN_LITTLE;

  if (TARGET_ARCHITECTURE != NULL)

    asm_info.mach = TARGET_ARCHITECTURE->mach;

  /* Now construct each line */

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

    {

      if (lines->addr_string)

        xfree (lines->addr_string);

      if (lines->insn)

        xfree (lines->insn);

      print_address (pc, gdb_dis_out);

      lines->addr = pc;

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

      ui_file_rewind (gdb_dis_out);

      pc = pc + TARGET_PRINT_INSN (pc, &asm_info);

      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)

{

  register CORE_ADDR newLow;

  int maxLines;

  int i;

  struct tui_asm_line* lines;

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

  if (maxLines <= 1)

     return pc;

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

                                         * maxLines);

  memset (lines, 0, sizeof (struct tui_asm_line) * maxLines);

  newLow = pc;

  if (from > 0)

    {

      tui_disassemble (lines, pc, maxLines);

      newLow = lines[maxLines - 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 = maxLines - 1;

      do {

         newLow -= 1 * maxLines;

         msymbol = lookup_minimal_symbol_by_pc_section (newLow, 0);

         if (msymbol)

            newLow = SYMBOL_VALUE_ADDRESS (msymbol);

         else

            newLow += 1 * maxLines;

         tui_disassemble (lines, newLow, maxLines);

         last_addr = 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 >= maxLines)

              pos = 0;

            next_addr = tui_disassemble (&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 >= maxLines)

         pos = 0;

      newLow = lines[pos].addr;

    }

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

    {

      xfree (lines[i].addr_string);

      xfree (lines[i].insn);

    }

  return newLow;

}

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

TuiStatus

tuiSetDisassemContent (CORE_ADDR pc)

{

  TuiStatus ret = TUI_FAILURE;

  register int i;

  register int offset = disassemWin->detail.sourceInfo.horizontalOffset;

  register int lineWidth, maxLines;

  CORE_ADDR cur_pc;

  TuiGenWinInfoPtr locator = locatorWinInfoPtr ();

  int tab_len = tuiDefaultTabLen ();

  struct tui_asm_line* lines;

  int insn_pos;

  int addr_size, max_size;

  char* line;

  if (pc == 0)

    return TUI_FAILURE;

  ret = tuiAllocSourceBuffer (disassemWin);

  if (ret != TUI_SUCCESS)

    return ret;

  disassemWin->detail.sourceInfo.startLineOrAddr.addr = pc;

  cur_pc = (CORE_ADDR)

    (((TuiWinElementPtr) locator->content[0])->whichElement.locator.addr);

  maxLines = disassemWin->generic.height - 2;   /* account for hilite */

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

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

                                         * maxLines);

  memset (lines, 0, sizeof (struct tui_asm_line) * maxLines);

  lineWidth = disassemWin->generic.width - 1;

  tui_disassemble (lines, pc, maxLines);

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

  addr_size = 0;

  max_size = 0;

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

    {

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

      if (len > addr_size)

        addr_size = len;

      len = strlen (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 < maxLines; i++)

    {

      TuiWinElementPtr element;

      TuiSourceElement* src;

      int curLen;

      element = (TuiWinElementPtr) disassemWin->generic.content[i];

      src = &element->whichElement.source;

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

      curLen = strlen (line);

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

      while (curLen < insn_pos)

        {

          strcat (line, " ");

          curLen++;

        }

      strcat (line, 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->lineOrAddr.addr = lines[i].addr;

      src->isExecPoint = lines[i].addr == cur_pc;

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

      src->hasBreak = (!src->isExecPoint

                       && breakpoint_here_p (pc) != no_breakpoint_here);

      xfree (lines[i].addr_string);

      xfree (lines[i].insn);

    }

  disassemWin->generic.contentSize = i;

  return TUI_SUCCESS;

}

/*

   ** tuiShowDisassem().

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

 */

void

tuiShowDisassem (CORE_ADDR startAddr)

{

  struct symtab *s = find_pc_symtab (startAddr);

  TuiWinInfoPtr winWithFocus = tuiWinWithFocus ();

  TuiLineOrAddress val;

  val.addr = startAddr;

  tuiAddWinToLayout (DISASSEM_WIN);

  tuiUpdateSourceWindow (disassemWin, 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 (currentLayout () != SRC_DISASSEM_COMMAND && winWithFocus == srcWin)

    tuiSetWinFocusTo (disassemWin);

  return;

}                               /* tuiShowDisassem */

/*

   ** tuiShowDisassemAndUpdateSource().

   **        Function to display the disassembly window.

 */

void

tuiShowDisassemAndUpdateSource (CORE_ADDR startAddr)

{

  struct symtab_and_line sal;

  tuiShowDisassem (startAddr);

  if (currentLayout () == SRC_DISASSEM_COMMAND)

    {

      TuiLineOrAddress 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 (startAddr, 0);

      val.lineNo = sal.line;

      tuiUpdateSourceWindow (srcWin, sal.symtab, val, TRUE);

      if (sal.symtab)

        {

          current_source_symtab = sal.symtab;

          tuiUpdateLocatorFilename (sal.symtab->filename);

        }

      else

        tuiUpdateLocatorFilename ("?");

    }

  return;

}                               /* tuiShowDisassemAndUpdateSource */

/*

   ** tuiGetBeginAsmAddress().

 */

CORE_ADDR

tuiGetBeginAsmAddress (void)

{

  TuiGenWinInfoPtr locator;

  TuiLocatorElementPtr element;

  CORE_ADDR addr;

  locator = locatorWinInfoPtr ();

  element = &((TuiWinElementPtr) locator->content[0])->whichElement.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;

}                               /* tuiGetBeginAsmAddress */

/* 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

tuiGetLowDisassemblyAddress (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 = tuiDefaultWinViewportHeight (DISASSEM_WIN, DISASSEM_COMMAND) / 2;

  pc = tui_find_disassembly_address (pc, -pos);

  if (pc < low)

    pc = low;

  return pc;

}

/*

   ** tuiVerticalDisassemScroll().

   **      Scroll the disassembly forward or backward vertically

 */

void

tuiVerticalDisassemScroll (TuiScrollDirection scrollDirection,

                           int numToScroll)

{

  if (disassemWin->generic.content != (OpaquePtr) NULL)

    {

      CORE_ADDR pc;

      TuiWinContent content;

      struct symtab *s;

      TuiLineOrAddress val;

      int maxLines, dir;

      content = (TuiWinContent) disassemWin->generic.content;

      if (current_source_symtab == (struct symtab *) NULL)

        s = find_pc_symtab (selected_frame->pc);

      else

        s = current_source_symtab;

      /* account for hilite */

      maxLines = disassemWin->generic.height - 2;

      pc = content[0]->whichElement.source.lineOrAddr.addr;

      dir = (scrollDirection == FORWARD_SCROLL) ? maxLines : - maxLines;

      val.addr = tui_find_disassembly_address (pc, dir);

      tuiUpdateSourceWindowAsIs (disassemWin, s, val, FALSE);

    }

}