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/* Target support for C++ classes on Windows.

   Contributed by Danny Smith (dannysmith@users.sourceforge.net)

   Copyright (C) 2005, 2007, 2009, 2010  Free Software Foundation, Inc.

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/cp-tree.h" /* This is why we're a separate module.  */

#include "flags.h"

#include "tm_p.h"

#include "diagnostic-core.h"

#include "hashtab.h"

bool

i386_pe_type_dllimport_p (tree decl)

{

  gcc_assert (TREE_CODE (decl) == VAR_DECL

              || TREE_CODE (decl) == FUNCTION_DECL);

  if (TARGET_NOP_FUN_DLLIMPORT && TREE_CODE (decl) == FUNCTION_DECL)

    return false;

  /* We ignore the dllimport attribute for inline member functions.

     This differs from MSVC behavior which treats it like GNUC

     'extern inline' extension.  Also ignore for template

     instantiations with linkonce semantics and artificial methods.  */

  if (TREE_CODE (decl) ==  FUNCTION_DECL

      && (DECL_DECLARED_INLINE_P (decl)

          || DECL_TEMPLATE_INSTANTIATION (decl)

          || DECL_ARTIFICIAL (decl)))

    return false;

  /* Overrides of the class dllimport decls by out-of-class definitions are

     handled by tree.c:merge_dllimport_decl_attributes.   */

  return true;

}

bool

i386_pe_type_dllexport_p (tree decl)

{

  gcc_assert (TREE_CODE (decl) == VAR_DECL

              || TREE_CODE (decl) == FUNCTION_DECL);

  /* Avoid exporting compiler-generated default dtors and copy ctors.

     The only artificial methods that need to be exported are virtual

     and non-virtual thunks.  */

  if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE

      && DECL_ARTIFICIAL (decl) && !DECL_THUNK_P (decl))

    return false;

  return true;

}

static inline void maybe_add_dllimport (tree decl)

{

  if (i386_pe_type_dllimport_p (decl))

    DECL_DLLIMPORT_P (decl) = 1;

}

static inline void maybe_add_dllexport (tree decl)

{

  if (i386_pe_type_dllexport_p (decl))

    {

      tree decl_attrs = DECL_ATTRIBUTES (decl);

      if (lookup_attribute ("dllexport", decl_attrs) != NULL_TREE)

        /* Already done.  */

        return;

      DECL_ATTRIBUTES (decl) = tree_cons (get_identifier ("dllexport"),

                                          NULL_TREE, decl_attrs);

    }

}

void

i386_pe_adjust_class_at_definition (tree t)

{

  tree member;

  gcc_assert (CLASS_TYPE_P (t));

  if (lookup_attribute ("dllexport", TYPE_ATTRIBUTES (t)) != NULL_TREE)

    {

      tree tmv = TYPE_MAIN_VARIANT (t);

      /* Make sure that we set dllexport attribute to typeinfo's

         base declaration, as otherwise it would fail to be exported as

         it isn't a class-member.  */

      if (tmv != NULL_TREE

          && CLASSTYPE_TYPEINFO_VAR (tmv) != NULL_TREE)

        {

          tree na, ti_decl = CLASSTYPE_TYPEINFO_VAR (tmv);

          na = tree_cons (get_identifier ("dllexport"), NULL_TREE,

                          NULL_TREE);

          decl_attributes (&ti_decl, na, 0);

        }

      /* Check static VAR_DECL's.  */

      for (member = TYPE_FIELDS (t); member; member = DECL_CHAIN (member))

        if (TREE_CODE (member) == VAR_DECL)

          maybe_add_dllexport (member);

      /* Check FUNCTION_DECL's.  */

      for (member = TYPE_METHODS (t); member;  member = DECL_CHAIN (member))

        if (TREE_CODE (member) == FUNCTION_DECL)

          {

            tree thunk;

            maybe_add_dllexport (member);

            /* Also add the attribute to its thunks.  */

            for (thunk = DECL_THUNKS (member); thunk;

                 thunk = TREE_CHAIN (thunk))

              maybe_add_dllexport (thunk);

        }

      /* Check vtables  */

      for (member = CLASSTYPE_VTABLES (t); member;  member = DECL_CHAIN (member))

        if (TREE_CODE (member) == VAR_DECL)

          maybe_add_dllexport (member);

    }

  else if (lookup_attribute ("dllimport", TYPE_ATTRIBUTES (t)) != NULL_TREE)

    {

      /* We don't actually add the attribute to the decl, just set the flag

         that signals that the address of this symbol is not a compile-time

         constant.   Any subsequent out-of-class declaration of members wil

         cause the DECL_DLLIMPORT_P flag to be unset.

         (See  tree.c: merge_dllimport_decl_attributes).

         That is just right since out-of class declarations can only be a

         definition.   */

      /* Check static VAR_DECL's.  */

      for (member = TYPE_FIELDS (t); member; member = DECL_CHAIN (member))

        if (TREE_CODE (member) == VAR_DECL)

          maybe_add_dllimport (member);

      /* Check FUNCTION_DECL's.  */

      for (member = TYPE_METHODS (t); member;  member = DECL_CHAIN (member))

        if (TREE_CODE (member) == FUNCTION_DECL)

          {

            tree thunk;

            maybe_add_dllimport (member);

            /* Also add the attribute to its thunks.  */

            for (thunk = DECL_THUNKS (member); thunk;

                 thunk = DECL_CHAIN (thunk))

              maybe_add_dllimport (thunk);

         }

      /* Check vtables  */

      for (member = CLASSTYPE_VTABLES (t); member;  member = DECL_CHAIN (member))

        if (TREE_CODE (member) == VAR_DECL)

          maybe_add_dllimport (member);

      /* We leave typeinfo tables alone.  We can't mark TI objects as

        dllimport, since the address of a secondary VTT may be needed

        for static initialization of a primary VTT.  VTT's  of

        dllimport'd classes should always be link-once COMDAT.  */

    }

}