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/* Generic code for supporting multiple C++ ABI's

   Copyright (C) 2001, 2002, 2003, 2005, 2006, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   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 "value.h"

#include "cp-abi.h"

#include "command.h"

#include "exceptions.h"

#include "gdbcmd.h"

#include "ui-out.h"

#include "gdb_string.h"

static struct cp_abi_ops *find_cp_abi (const char *short_name);

static struct cp_abi_ops current_cp_abi = { "", NULL };

static struct cp_abi_ops auto_cp_abi = { "auto", NULL };

#define CP_ABI_MAX 8

static struct cp_abi_ops *cp_abis[CP_ABI_MAX];

static int num_cp_abis = 0;

enum ctor_kinds

is_constructor_name (const char *name)

{

  if ((current_cp_abi.is_constructor_name) == NULL)

    error (_("ABI doesn't define required function is_constructor_name"));

  return (*current_cp_abi.is_constructor_name) (name);

}

enum dtor_kinds

is_destructor_name (const char *name)

{

  if ((current_cp_abi.is_destructor_name) == NULL)

    error (_("ABI doesn't define required function is_destructor_name"));

  return (*current_cp_abi.is_destructor_name) (name);

}

int

is_vtable_name (const char *name)

{

  if ((current_cp_abi.is_vtable_name) == NULL)

    error (_("ABI doesn't define required function is_vtable_name"));

  return (*current_cp_abi.is_vtable_name) (name);

}

int

is_operator_name (const char *name)

{

  if ((current_cp_abi.is_operator_name) == NULL)

    error (_("ABI doesn't define required function is_operator_name"));

  return (*current_cp_abi.is_operator_name) (name);

}

int

baseclass_offset (struct type *type, int index, const bfd_byte *valaddr,

                  CORE_ADDR address)

{

  if (current_cp_abi.baseclass_offset == NULL)

    error (_("ABI doesn't define required function baseclass_offset"));

  return (*current_cp_abi.baseclass_offset) (type, index, valaddr, address);

}

struct value *

value_virtual_fn_field (struct value **arg1p, struct fn_field *f, int j,

                        struct type *type, int offset)

{

  if ((current_cp_abi.virtual_fn_field) == NULL)

    return NULL;

  return (*current_cp_abi.virtual_fn_field) (arg1p, f, j, type, offset);

}

struct type *

value_rtti_type (struct value *v, int *full, int *top, int *using_enc)

{

  struct type *ret = NULL;

  struct gdb_exception e;

  if ((current_cp_abi.rtti_type) == NULL)

    return NULL;

  TRY_CATCH (e, RETURN_MASK_ERROR)

    {

      ret = (*current_cp_abi.rtti_type) (v, full, top, using_enc);

    }

  if (e.reason < 0)

    return NULL;

  return ret;

}

void

cplus_print_method_ptr (const gdb_byte *contents, struct type *type,

                        struct ui_file *stream)

{

  if (current_cp_abi.print_method_ptr == NULL)

    error (_("GDB does not support pointers to methods on this target"));

  (*current_cp_abi.print_method_ptr) (contents, type, stream);

}

int

cplus_method_ptr_size (struct type *to_type)

{

  if (current_cp_abi.method_ptr_size == NULL)

    error (_("GDB does not support pointers to methods on this target"));

  return (*current_cp_abi.method_ptr_size) (to_type);

}

void

cplus_make_method_ptr (struct type *type, gdb_byte *contents,

                       CORE_ADDR value, int is_virtual)

{

  if (current_cp_abi.make_method_ptr == NULL)

    error (_("GDB does not support pointers to methods on this target"));

  (*current_cp_abi.make_method_ptr) (type, contents, value, is_virtual);

}

CORE_ADDR

cplus_skip_trampoline (struct frame_info *frame, CORE_ADDR stop_pc)

{

  if (current_cp_abi.skip_trampoline == NULL)

    return 0;

  return (*current_cp_abi.skip_trampoline) (frame, stop_pc);

}

struct value *

cplus_method_ptr_to_value (struct value **this_p, struct value *method_ptr)

{

  if (current_cp_abi.method_ptr_to_value == NULL)

    error (_("GDB does not support pointers to methods on this target"));

  return (*current_cp_abi.method_ptr_to_value) (this_p, method_ptr);

}

int

cp_pass_by_reference (struct type *type)

{

  if ((current_cp_abi.pass_by_reference) == NULL)

    return 0;

  return (*current_cp_abi.pass_by_reference) (type);

}

/* Set the current C++ ABI to SHORT_NAME.  */

static int

switch_to_cp_abi (const char *short_name)

{

  struct cp_abi_ops *abi;

  abi = find_cp_abi (short_name);

  if (abi == NULL)

    return 0;

  current_cp_abi = *abi;

  return 1;

}

/* Add ABI to the list of supported C++ ABI's.  */

int

register_cp_abi (struct cp_abi_ops *abi)

{

  if (num_cp_abis == CP_ABI_MAX)

    internal_error (__FILE__, __LINE__,

                    _("Too many C++ ABIs, please increase CP_ABI_MAX in cp-abi.c"));

  cp_abis[num_cp_abis++] = abi;

  return 1;

}

/* Set the ABI to use in "auto" mode to SHORT_NAME.  */

void

set_cp_abi_as_auto_default (const char *short_name)

{

  char *new_longname, *new_doc;

  struct cp_abi_ops *abi = find_cp_abi (short_name);

  if (abi == NULL)

    internal_error (__FILE__, __LINE__,

                    _("Cannot find C++ ABI \"%s\" to set it as auto default."),

                    short_name);

  if (auto_cp_abi.longname != NULL)

    xfree ((char *) auto_cp_abi.longname);

  if (auto_cp_abi.doc != NULL)

    xfree ((char *) auto_cp_abi.doc);

  auto_cp_abi = *abi;

  auto_cp_abi.shortname = "auto";

  new_longname = xstrprintf ("currently \"%s\"", abi->shortname);

  auto_cp_abi.longname = new_longname;

  new_doc = xstrprintf ("Automatically selected; currently \"%s\"",

             abi->shortname);

  auto_cp_abi.doc = new_doc;

  /* Since we copy the current ABI into current_cp_abi instead of

     using a pointer, if auto is currently the default, we need to

     reset it.  */

  if (strcmp (current_cp_abi.shortname, "auto") == 0)

    switch_to_cp_abi ("auto");

}

/* Return the ABI operations associated with SHORT_NAME.  */

static struct cp_abi_ops *

find_cp_abi (const char *short_name)

{

  int i;

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

    if (strcmp (cp_abis[i]->shortname, short_name) == 0)

      return cp_abis[i];

  return NULL;

}

/* Display the list of registered C++ ABIs.  */

static void

list_cp_abis (int from_tty)

{

  struct cleanup *cleanup_chain;

  int i;

  ui_out_text (uiout, "The available C++ ABIs are:\n");

  cleanup_chain = make_cleanup_ui_out_tuple_begin_end (uiout, "cp-abi-list");

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

    {

      char pad[14];

      int padcount;

      ui_out_text (uiout, "  ");

      ui_out_field_string (uiout, "cp-abi", cp_abis[i]->shortname);

      padcount = 16 - 2 - strlen (cp_abis[i]->shortname);

      pad[padcount] = 0;

      while (padcount > 0)

        pad[--padcount] = ' ';

      ui_out_text (uiout, pad);

      ui_out_field_string (uiout, "doc", cp_abis[i]->doc);

      ui_out_text (uiout, "\n");

    }

  do_cleanups (cleanup_chain);

}

/* Set the current C++ ABI, or display the list of options if no

   argument is given.  */

static void

set_cp_abi_cmd (char *args, int from_tty)

{

  if (args == NULL)

    {

      list_cp_abis (from_tty);

      return;

    }

  if (!switch_to_cp_abi (args))

    error (_("Could not find \"%s\" in ABI list"), args);

}

/* Show the currently selected C++ ABI.  */

static void

show_cp_abi_cmd (char *args, int from_tty)

{

  ui_out_text (uiout, "The currently selected C++ ABI is \"");

  ui_out_field_string (uiout, "cp-abi", current_cp_abi.shortname);

  ui_out_text (uiout, "\" (");

  ui_out_field_string (uiout, "longname", current_cp_abi.longname);

  ui_out_text (uiout, ").\n");

}

extern initialize_file_ftype _initialize_cp_abi; /* -Wmissing-prototypes */

void

_initialize_cp_abi (void)

{

  register_cp_abi (&auto_cp_abi);

  switch_to_cp_abi ("auto");

  add_cmd ("cp-abi", class_obscure, set_cp_abi_cmd, _("\

Set the ABI used for inspecting C++ objects.\n\

\"set cp-abi\" with no arguments will list the available ABIs."),

           &setlist);

  add_cmd ("cp-abi", class_obscure, show_cp_abi_cmd,

           _("Show the ABI used for inspecting C++ objects."), &showlist);

}