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/* Basic C++ demangling support for GDB.

   Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,

   2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

   Written by Fred Fish at Cygnus Support.

   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/>.  */

/*  This file contains support code for C++ demangling that is common

   to a styles of demangling, and GDB specific. */

#include "defs.h"

#include "command.h"

#include "gdbcmd.h"

#include "demangle.h"

#include "gdb_string.h"

/* Select the default C++ demangling style to use.  The default is "auto",

   which allows gdb to attempt to pick an appropriate demangling style for

   the executable it has loaded.  It can be set to a specific style ("gnu",

   "lucid", "arm", "hp", etc.) in which case gdb will never attempt to do auto

   selection of the style unless you do an explicit "set demangle auto".

   To select one of these as the default, set DEFAULT_DEMANGLING_STYLE in

   the appropriate target configuration file. */

#ifndef DEFAULT_DEMANGLING_STYLE

#define DEFAULT_DEMANGLING_STYLE AUTO_DEMANGLING_STYLE_STRING

#endif

extern void _initialize_demangler (void);

/* String name for the current demangling style.  Set by the

   "set demangle-style" command, printed as part of the output by the

   "show demangle-style" command. */

static char *current_demangling_style_string;

/* The array of names of the known demanglyng styles.  Generated by

   _initialize_demangler from libiberty_demanglers[] array.  */

static const char **demangling_style_names;

static void

show_demangling_style_names(struct ui_file *file, int from_tty,

                            struct cmd_list_element *c, const char *value)

{

  fprintf_filtered (file, _("The current C++ demangling style is \"%s\".\n"),

                    value);

}

static void set_demangling_command (char *, int, struct cmd_list_element *);

/* Set current demangling style.  Called by the "set demangle-style"

   command after it has updated the current_demangling_style_string to

   match what the user has entered.

   If the user has entered a string that matches a known demangling style

   name in the demanglers[] array then just leave the string alone and update

   the current_demangling_style enum value to match.

   If the user has entered a string that doesn't match, including an empty

   string, then print a list of the currently known styles and restore

   the current_demangling_style_string to match the current_demangling_style

   enum value.

   Note:  Assumes that current_demangling_style_string always points to

   a malloc'd string, even if it is a null-string. */

static void

set_demangling_command (char *ignore, int from_tty, struct cmd_list_element *c)

{

  const struct demangler_engine *dem;

  /*  First just try to match whatever style name the user supplied with

     one of the known ones.  Don't bother special casing for an empty

     name, we just treat it as any other style name that doesn't match.

     If we match, update the current demangling style enum. */

  for (dem = libiberty_demanglers;

       dem->demangling_style != unknown_demangling;

       dem++)

    {

      if (strcmp (current_demangling_style_string,

                  dem->demangling_style_name) == 0)

        {

          current_demangling_style = dem->demangling_style;

          break;

        }

    }

  /* Check to see if we found a match.  If not, gripe about any non-empty

     style name and supply a list of valid ones.  FIXME:  This should

     probably be done with some sort of completion and with help. */

  if (dem->demangling_style == unknown_demangling)

    {

      if (*current_demangling_style_string != '\0')

        {

          printf_unfiltered (_("Unknown demangling style `%s'.\n"),

                             current_demangling_style_string);

        }

      printf_unfiltered (_("The currently understood settings are:\n\n"));

      for (dem = libiberty_demanglers;

           dem->demangling_style != unknown_demangling;

           dem++)

        {

          printf_unfiltered ("%-10s %s\n", dem->demangling_style_name,

                             dem->demangling_style_doc);

          if (dem->demangling_style == current_demangling_style)

            {

              xfree (current_demangling_style_string);

              current_demangling_style_string =

                xstrdup (dem->demangling_style_name);

            }

        }

      if (current_demangling_style == unknown_demangling)

        {

          /* This can happen during initialization if gdb is compiled with

             a DEMANGLING_STYLE value that is unknown, so pick the first

             one as the default. */

          current_demangling_style = libiberty_demanglers[0].demangling_style;

          current_demangling_style_string =

            xstrdup (libiberty_demanglers[0].demangling_style_name);

          warning (_("`%s' style demangling chosen as the default."),

                   current_demangling_style_string);

        }

    }

}

/* Fake a "set demangle-style" command. */

void

set_demangling_style (char *style)

{

  if (current_demangling_style_string != NULL)

    {

      xfree (current_demangling_style_string);

    }

  current_demangling_style_string = xstrdup (style);

  set_demangling_command ((char *) NULL, 0, (struct cmd_list_element *) NULL);

}

/* G++ uses a special character to indicate certain internal names.  Which

   character it is depends on the platform:

   - Usually '$' on systems where the assembler will accept that

   - Usually '.' otherwise (this includes most sysv4-like systems and most

     ELF targets)

   - Occasionally '_' if neither of the above is usable

   We check '$' first because it is the safest, and '.' often has another

   meaning.  We don't currently try to handle '_' because the precise forms

   of the names are different on those targets.  */

static char cplus_markers[] = {'$', '.', '\0'};

int

is_cplus_marker (int c)

{

  return c && strchr (cplus_markers, c) != NULL;

}

void

_initialize_demangler (void)

{

  struct cmd_list_element *set, *show;

  int i, ndems;

  /* Fill the demangling_style_names[] array.  */

  for (ndems = 0;

       libiberty_demanglers[ndems].demangling_style != unknown_demangling;

       ndems++)

    ;

  demangling_style_names = xcalloc (ndems + 1, sizeof (char *));

  for (i = 0;

       libiberty_demanglers[i].demangling_style != unknown_demangling;

       i++)

    demangling_style_names[i] =

      xstrdup (libiberty_demanglers[i].demangling_style_name);

  /* FIXME: cagney/2005-02-20: The code implementing this variable are

     malloc-ing and free-ing current_demangling_style_string when it

     should instead just point to an element of

     demangling_style_names.  */

  add_setshow_enum_cmd ("demangle-style", class_support,

                        demangling_style_names,

                        (const char **) &current_demangling_style_string, _("\

Set the current C++ demangling style."), _("\

Show the current C++ demangling style."), _("\

Use `set demangle-style' without arguments for a list of demangling styles."),

                        set_demangling_command,

                        show_demangling_style_names,

                        &setlist, &showlist);

  /* Set the default demangling style chosen at compilation time. */

  set_demangling_style (DEFAULT_DEMANGLING_STYLE);

}