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/* Language-dependent hooks for C++.

   Copyright 2001, 2002, 2004, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   Contributed by Alexandre Oliva  <aoliva@redhat.com>

This file is part of GCC.

GCC 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, or (at your option)

any later version.

GCC 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 GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "tree.h"

#include "cp-tree.h"

#include "c-family/c-common.h"

#include "langhooks.h"

#include "langhooks-def.h"

#include "debug.h"

#include "cp-objcp-common.h"

#include "hashtab.h"

#include "target.h"

#include "parser.h"

enum c_language_kind c_language = clk_cxx;

static void cp_init_ts (void);

static const char * cxx_dwarf_name (tree t, int verbosity);

static enum classify_record cp_classify_record (tree type);

static tree cp_eh_personality (void);

static tree get_template_innermost_arguments_folded (const_tree);

static tree get_template_argument_pack_elems_folded (const_tree);

/* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h;

   consequently, there should be very few hooks below.  */

#undef LANG_HOOKS_NAME

#define LANG_HOOKS_NAME "GNU C++"

#undef LANG_HOOKS_INIT

#define LANG_HOOKS_INIT cxx_init

#undef LANG_HOOKS_CLASSIFY_RECORD

#define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record

#undef LANG_HOOKS_GENERIC_TYPE_P

#define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p

#undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS

#define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \

        get_primary_template_innermost_parameters

#undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS

#define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \

        get_template_innermost_arguments_folded

#undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P

#define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \

        function_parameter_pack_p

#undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS

#define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \

        get_template_argument_pack_elems_folded

#undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P

#define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \

        template_template_parameter_p

#undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P

#define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \

        function_parameter_expanded_from_pack_p

#undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL

#define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl

#undef LANG_HOOKS_DWARF_NAME

#define LANG_HOOKS_DWARF_NAME cxx_dwarf_name

#undef LANG_HOOKS_INIT_TS

#define LANG_HOOKS_INIT_TS cp_init_ts

#undef LANG_HOOKS_EH_PERSONALITY

#define LANG_HOOKS_EH_PERSONALITY cp_eh_personality

#undef LANG_HOOKS_EH_RUNTIME_TYPE

#define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type

/* Each front end provides its own lang hook initializer.  */

struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;

/* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c;

   there should be very few routines below.  */

/* The following function does something real, but only in Objective-C++.  */

tree

objcp_tsubst_copy_and_build (tree t ATTRIBUTE_UNUSED,

                             tree args ATTRIBUTE_UNUSED,

                             tsubst_flags_t complain ATTRIBUTE_UNUSED,

                             tree in_decl ATTRIBUTE_UNUSED,

                             bool function_p ATTRIBUTE_UNUSED)

{

  return NULL_TREE;

}

static void

cp_init_ts (void)

{

  cp_common_init_ts ();

  init_shadowed_var_for_decl ();

}

static const char *

cxx_dwarf_name (tree t, int verbosity)

{

  gcc_assert (DECL_P (t));

  if (DECL_NAME (t)

      && (ANON_AGGRNAME_P (DECL_NAME (t)) || LAMBDANAME_P (DECL_NAME (t))))

    return NULL;

  if (verbosity >= 2)

    return decl_as_string (t,

                           TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME

                           | TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);

  return cxx_printable_name (t, verbosity);

}

static enum classify_record

cp_classify_record (tree type)

{

  if (CLASSTYPE_DECLARED_CLASS (type))

    return RECORD_IS_CLASS;

  return RECORD_IS_STRUCT;

}

static GTY(()) tree cp_eh_personality_decl;

static tree

cp_eh_personality (void)

{

  if (!cp_eh_personality_decl)

    {

      const char *lang = (pragma_java_exceptions ? "gcj" : "gxx");

      cp_eh_personality_decl = build_personality_function (lang);

    }

  return cp_eh_personality_decl;

}

/* This is a subroutine of fold_cplus_constants.  It returns TRUE if T

   is a C++ specific constant that needs to be folded further before

   being passed to the debug info emitter.  */

static bool

template_arg_needs_folding (const_tree t)

{

  /* For now only PTRMEM_CST nodes are to be folded further.  */

  if (TREE_CODE (t) == PTRMEM_CST)

    return true;

  return false;

}

/* Fold the elements of the TREE_VEC C which are C++ specific nodes

   that would need folding so that they can be processed by the debug

   info emitter. This is a subroutine of

   get_template_innermost_arguments_folded and

   get_template_argument_pack_elems_folded.  */

static tree

fold_cplus_constants (const_tree c)

{

  tree folded_elems, elems = CONST_CAST_TREE (c);

  int vec_len, i;

  if (elems == NULL_TREE || elems == error_mark_node)

    return elems;

  vec_len = TREE_VEC_LENGTH (elems);

  /* First check if there is at least one element that needs

     folding. If there is none, we just return ELEMS. Otherwise create

     and return a new tree vector that contains the folded versions of

     ELEMS. This is to avoid allocating memory if we don't need

     to.  */

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

    {

      if (template_arg_needs_folding (TREE_VEC_ELT (elems, i)))

        break;

    }

  if (i == vec_len)

    return elems;

  folded_elems = make_tree_vec (vec_len);

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

    {

      tree elem = TREE_VEC_ELT (elems, i);

      TREE_VEC_ELT (folded_elems, i) =

        (elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem;

    }

  return folded_elems;

}

/* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS

   hook. It returns the innermost template arguments of type T, and

   makes sure those arguments are folded enough for the debug info

   emitter.  */

static tree

get_template_innermost_arguments_folded (const_tree t)

{

  return fold_cplus_constants (get_template_innermost_arguments (t));

}

static tree

get_template_argument_pack_elems_folded (const_tree t)

{

  return fold_cplus_constants (get_template_argument_pack_elems (t));

}

#include "gt-cp-cp-lang.h"

#include "gtype-cp.h"