Subversion Repositories openrisc_2011-10-31

/* Handle the hair of processing (but not expanding) inline functions.

   Also manage function and variable name overloading.

   Copyright (C) 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,

   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009

   Free Software Foundation, Inc.

   Contributed by Michael Tiemann (tiemann@cygnus.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/>.  */

/* Handle method declarations.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include "tree.h"

#include "cp-tree.h"

#include "rtl.h"

#include "expr.h"

#include "output.h"

#include "flags.h"

#include "toplev.h"

#include "tm_p.h"

#include "target.h"

#include "tree-pass.h"

#include "diagnostic.h"

#include "cgraph.h"

#include "gimple.h"

/* Various flags to control the mangling process.  */

enum mangling_flags

{

  /* No flags.  */

  mf_none = 0,

  /* The thing we are presently mangling is part of a template type,

     rather than a fully instantiated type.  Therefore, we may see

     complex expressions where we would normally expect to see a

     simple integer constant.  */

  mf_maybe_uninstantiated = 1,

  /* When mangling a numeric value, use the form `_XX_' (instead of

     just `XX') if the value has more than one digit.  */

  mf_use_underscores_around_value = 2

};

typedef enum mangling_flags mangling_flags;

static void do_build_assign_ref (tree);

static void do_build_copy_constructor (tree);

static tree synthesize_exception_spec (tree, tree (*) (tree, void *), void *);

static tree make_alias_for_thunk (tree);

/* Called once to initialize method.c.  */

void

init_method (void)

{

  init_mangle ();

}

/* Return a this or result adjusting thunk to FUNCTION.  THIS_ADJUSTING

   indicates whether it is a this or result adjusting thunk.

   FIXED_OFFSET and VIRTUAL_OFFSET indicate how to do the adjustment

   (see thunk_adjust).  VIRTUAL_OFFSET can be NULL, but FIXED_OFFSET

   never is.  VIRTUAL_OFFSET is the /index/ into the vtable for this

   adjusting thunks, we scale it to a byte offset. For covariant

   thunks VIRTUAL_OFFSET is the virtual binfo.  You must post process

   the returned thunk with finish_thunk.  */

tree

make_thunk (tree function, bool this_adjusting,

            tree fixed_offset, tree virtual_offset)

{

  HOST_WIDE_INT d;

  tree thunk;

  gcc_assert (TREE_CODE (function) == FUNCTION_DECL);

  /* We can have this thunks to covariant thunks, but not vice versa.  */

  gcc_assert (!DECL_THIS_THUNK_P (function));

  gcc_assert (!DECL_RESULT_THUNK_P (function) || this_adjusting);

  /* Scale the VIRTUAL_OFFSET to be in terms of bytes.  */

  if (this_adjusting && virtual_offset)

    virtual_offset

      = size_binop (MULT_EXPR,

                    virtual_offset,

                    convert (ssizetype,

                             TYPE_SIZE_UNIT (vtable_entry_type)));

  d = tree_low_cst (fixed_offset, 0);

  /* See if we already have the thunk in question.  For this_adjusting

     thunks VIRTUAL_OFFSET will be an INTEGER_CST, for covariant thunks it

     will be a BINFO.  */

  for (thunk = DECL_THUNKS (function); thunk; thunk = TREE_CHAIN (thunk))

    if (DECL_THIS_THUNK_P (thunk) == this_adjusting

        && THUNK_FIXED_OFFSET (thunk) == d

        && !virtual_offset == !THUNK_VIRTUAL_OFFSET (thunk)

        && (!virtual_offset

            || (this_adjusting

                ? tree_int_cst_equal (THUNK_VIRTUAL_OFFSET (thunk),

                                      virtual_offset)

                : THUNK_VIRTUAL_OFFSET (thunk) == virtual_offset)))

      return thunk;

  /* All thunks must be created before FUNCTION is actually emitted;

     the ABI requires that all thunks be emitted together with the

     function to which they transfer control.  */

  gcc_assert (!TREE_ASM_WRITTEN (function));

  /* Likewise, we can only be adding thunks to a function declared in

     the class currently being laid out.  */

  gcc_assert (TYPE_SIZE (DECL_CONTEXT (function))

              && TYPE_BEING_DEFINED (DECL_CONTEXT (function)));

  thunk = build_decl (DECL_SOURCE_LOCATION (function),

                      FUNCTION_DECL, NULL_TREE, TREE_TYPE (function));

  DECL_LANG_SPECIFIC (thunk) = DECL_LANG_SPECIFIC (function);

  cxx_dup_lang_specific_decl (thunk);

  DECL_THUNKS (thunk) = NULL_TREE;

  DECL_CONTEXT (thunk) = DECL_CONTEXT (function);

  TREE_READONLY (thunk) = TREE_READONLY (function);

  TREE_THIS_VOLATILE (thunk) = TREE_THIS_VOLATILE (function);

  TREE_PUBLIC (thunk) = TREE_PUBLIC (function);

  SET_DECL_THUNK_P (thunk, this_adjusting);

  THUNK_TARGET (thunk) = function;

  THUNK_FIXED_OFFSET (thunk) = d;

  THUNK_VIRTUAL_OFFSET (thunk) = virtual_offset;

  THUNK_ALIAS (thunk) = NULL_TREE;

  /* The thunk itself is not a constructor or destructor, even if

     the thing it is thunking to is.  */

  DECL_INTERFACE_KNOWN (thunk) = 1;

  DECL_NOT_REALLY_EXTERN (thunk) = 1;

  DECL_SAVED_FUNCTION_DATA (thunk) = NULL;

  DECL_DESTRUCTOR_P (thunk) = 0;

  DECL_CONSTRUCTOR_P (thunk) = 0;

  DECL_EXTERNAL (thunk) = 1;

  DECL_ARTIFICIAL (thunk) = 1;

  /* The THUNK is not a pending inline, even if the FUNCTION is.  */

  DECL_PENDING_INLINE_P (thunk) = 0;

  DECL_DECLARED_INLINE_P (thunk) = 0;

  /* Nor is it a template instantiation.  */

  DECL_USE_TEMPLATE (thunk) = 0;

  DECL_TEMPLATE_INFO (thunk) = NULL;

  /* Add it to the list of thunks associated with FUNCTION.  */

  TREE_CHAIN (thunk) = DECL_THUNKS (function);

  DECL_THUNKS (function) = thunk;

  return thunk;

}

/* Finish THUNK, a thunk decl.  */

void

finish_thunk (tree thunk)

{

  tree function, name;

  tree fixed_offset = ssize_int (THUNK_FIXED_OFFSET (thunk));

  tree virtual_offset = THUNK_VIRTUAL_OFFSET (thunk);

  gcc_assert (!DECL_NAME (thunk) && DECL_THUNK_P (thunk));

  if (virtual_offset && DECL_RESULT_THUNK_P (thunk))

    virtual_offset = BINFO_VPTR_FIELD (virtual_offset);

  function = THUNK_TARGET (thunk);

  name = mangle_thunk (function, DECL_THIS_THUNK_P (thunk),

                       fixed_offset, virtual_offset);

  /* We can end up with declarations of (logically) different

     covariant thunks, that do identical adjustments.  The two thunks

     will be adjusting between within different hierarchies, which

     happen to have the same layout.  We must nullify one of them to

     refer to the other.  */

  if (DECL_RESULT_THUNK_P (thunk))

    {

      tree cov_probe;

      for (cov_probe = DECL_THUNKS (function);

           cov_probe; cov_probe = TREE_CHAIN (cov_probe))

        if (DECL_NAME (cov_probe) == name)

          {

            gcc_assert (!DECL_THUNKS (thunk));

            THUNK_ALIAS (thunk) = (THUNK_ALIAS (cov_probe)

                                   ? THUNK_ALIAS (cov_probe) : cov_probe);

            break;

          }

    }

  DECL_NAME (thunk) = name;

  SET_DECL_ASSEMBLER_NAME (thunk, name);

}

static GTY (()) int thunk_labelno;

/* Create a static alias to target.  */

tree

make_alias_for (tree target, tree newid)

{

  tree alias = build_decl (DECL_SOURCE_LOCATION (target),

                           TREE_CODE (target), newid, TREE_TYPE (target));

  DECL_LANG_SPECIFIC (alias) = DECL_LANG_SPECIFIC (target);

  cxx_dup_lang_specific_decl (alias);

  DECL_CONTEXT (alias) = NULL;

  TREE_READONLY (alias) = TREE_READONLY (target);

  TREE_THIS_VOLATILE (alias) = TREE_THIS_VOLATILE (target);

  TREE_PUBLIC (alias) = 0;

  DECL_INTERFACE_KNOWN (alias) = 1;

  if (DECL_LANG_SPECIFIC (alias))

    {

      DECL_NOT_REALLY_EXTERN (alias) = 1;

      DECL_USE_TEMPLATE (alias) = 0;

      DECL_TEMPLATE_INFO (alias) = NULL;

    }

  DECL_EXTERNAL (alias) = 0;

  DECL_ARTIFICIAL (alias) = 1;

  DECL_TEMPLATE_INSTANTIATED (alias) = 0;

  if (TREE_CODE (alias) == FUNCTION_DECL)

    {

      DECL_SAVED_FUNCTION_DATA (alias) = NULL;

      DECL_DESTRUCTOR_P (alias) = 0;

      DECL_CONSTRUCTOR_P (alias) = 0;

      DECL_PENDING_INLINE_P (alias) = 0;

      DECL_DECLARED_INLINE_P (alias) = 0;

      DECL_INITIAL (alias) = error_mark_node;

      DECL_ARGUMENTS (alias) = copy_list (DECL_ARGUMENTS (target));

    }

  else

    TREE_STATIC (alias) = 1;

  TREE_ADDRESSABLE (alias) = 1;

  TREE_USED (alias) = 1;

  SET_DECL_ASSEMBLER_NAME (alias, DECL_NAME (alias));

  TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias)) = 1;

  return alias;

}

static tree

make_alias_for_thunk (tree function)

{

  tree alias;

  char buf[256];

  ASM_GENERATE_INTERNAL_LABEL (buf, "LTHUNK", thunk_labelno);

  thunk_labelno++;

  alias = make_alias_for (function, get_identifier (buf));

  if (!flag_syntax_only)

    {

      bool ok = cgraph_same_body_alias (alias, function);

      DECL_ASSEMBLER_NAME (function);

      gcc_assert (ok);

    }

  return alias;

}

/* Emit the definition of a C++ multiple inheritance or covariant

   return vtable thunk.  If EMIT_P is nonzero, the thunk is emitted

   immediately.  */

void

use_thunk (tree thunk_fndecl, bool emit_p)

{

  tree a, t, function, alias;

  tree virtual_offset;

  HOST_WIDE_INT fixed_offset, virtual_value;

  bool this_adjusting = DECL_THIS_THUNK_P (thunk_fndecl);

  /* We should have called finish_thunk to give it a name.  */

  gcc_assert (DECL_NAME (thunk_fndecl));

  /* We should never be using an alias, always refer to the

     aliased thunk.  */

  gcc_assert (!THUNK_ALIAS (thunk_fndecl));

  if (TREE_ASM_WRITTEN (thunk_fndecl))

    return;

  function = THUNK_TARGET (thunk_fndecl);

  if (DECL_RESULT (thunk_fndecl))

    /* We already turned this thunk into an ordinary function.

       There's no need to process this thunk again.  */

    return;

  if (DECL_THUNK_P (function))

    /* The target is itself a thunk, process it now.  */

    use_thunk (function, emit_p);

  /* Thunks are always addressable; they only appear in vtables.  */

  TREE_ADDRESSABLE (thunk_fndecl) = 1;

  /* Figure out what function is being thunked to.  It's referenced in

     this translation unit.  */

  TREE_ADDRESSABLE (function) = 1;

  mark_used (function);

  if (!emit_p)

    return;

  if (TARGET_USE_LOCAL_THUNK_ALIAS_P (function))

   alias = make_alias_for_thunk (function);

  else

   alias = function;

  fixed_offset = THUNK_FIXED_OFFSET (thunk_fndecl);

  virtual_offset = THUNK_VIRTUAL_OFFSET (thunk_fndecl);

  if (virtual_offset)

    {

      if (!this_adjusting)

        virtual_offset = BINFO_VPTR_FIELD (virtual_offset);

      virtual_value = tree_low_cst (virtual_offset, /*pos=*/0);

      gcc_assert (virtual_value);

    }

  else

    virtual_value = 0;

  /* And, if we need to emit the thunk, it's used.  */

  mark_used (thunk_fndecl);

  /* This thunk is actually defined.  */

  DECL_EXTERNAL (thunk_fndecl) = 0;

  /* The linkage of the function may have changed.  FIXME in linkage

     rewrite.  */

  TREE_PUBLIC (thunk_fndecl) = TREE_PUBLIC (function);

  DECL_VISIBILITY (thunk_fndecl) = DECL_VISIBILITY (function);

  DECL_VISIBILITY_SPECIFIED (thunk_fndecl)

    = DECL_VISIBILITY_SPECIFIED (function);

  if (DECL_ONE_ONLY (function) || DECL_WEAK (function))

    make_decl_one_only (thunk_fndecl, cxx_comdat_group (thunk_fndecl));

  if (flag_syntax_only)

    {

      TREE_ASM_WRITTEN (thunk_fndecl) = 1;

      return;

    }

  push_to_top_level ();

  if (TARGET_USE_LOCAL_THUNK_ALIAS_P (function)

      && targetm.have_named_sections)

    {

      resolve_unique_section (function, 0, flag_function_sections);

      if (DECL_SECTION_NAME (function) != NULL && DECL_ONE_ONLY (function))

        {

          resolve_unique_section (thunk_fndecl, 0, flag_function_sections);

          /* Output the thunk into the same section as function.  */

          DECL_SECTION_NAME (thunk_fndecl) = DECL_SECTION_NAME (function);

        }

    }

  /* Set up cloned argument trees for the thunk.  */

  t = NULL_TREE;

  for (a = DECL_ARGUMENTS (function); a; a = TREE_CHAIN (a))

    {

      tree x = copy_node (a);

      TREE_CHAIN (x) = t;

      DECL_CONTEXT (x) = thunk_fndecl;

      SET_DECL_RTL (x, NULL_RTX);

      DECL_HAS_VALUE_EXPR_P (x) = 0;

      t = x;

    }

  a = nreverse (t);

  DECL_ARGUMENTS (thunk_fndecl) = a;

  TREE_ASM_WRITTEN (thunk_fndecl) = 1;

  cgraph_add_thunk (thunk_fndecl, function,

                    this_adjusting, fixed_offset, virtual_value,

                    virtual_offset, alias);

  if (!this_adjusting

      || !targetm.asm_out.can_output_mi_thunk (thunk_fndecl, fixed_offset,

                                               virtual_value, alias))

    {

      /* If this is a covariant thunk, or we don't have the necessary

         code for efficient thunks, generate a thunk function that

         just makes a call to the real function.  Unfortunately, this

         doesn't work for varargs.  */

      if (varargs_function_p (function))

        error ("generic thunk code fails for method %q#D which uses %<...%>",

               function);

    }

  pop_from_top_level ();

}

/* Code for synthesizing methods which have default semantics defined.  */

/* Generate code for default X(X&) or X(X&&) constructor.  */

static void

do_build_copy_constructor (tree fndecl)

{

  tree parm = FUNCTION_FIRST_USER_PARM (fndecl);

  bool move_p = DECL_MOVE_CONSTRUCTOR_P (fndecl);

  parm = convert_from_reference (parm);

  if (TYPE_HAS_TRIVIAL_INIT_REF (current_class_type)

      && is_empty_class (current_class_type))

    /* Don't copy the padding byte; it might not have been allocated

       if *this is a base subobject.  */;

  else if (TYPE_HAS_TRIVIAL_INIT_REF (current_class_type))

    {

      tree t = build2 (INIT_EXPR, void_type_node, current_class_ref, parm);

      finish_expr_stmt (t);

    }

  else

    {

      tree fields = TYPE_FIELDS (current_class_type);

      tree member_init_list = NULL_TREE;

      int cvquals = cp_type_quals (TREE_TYPE (parm));

      int i;

      tree binfo, base_binfo;

      tree init;

      VEC(tree,gc) *vbases;

      /* Initialize all the base-classes with the parameter converted

         to their type so that we get their copy constructor and not

         another constructor that takes current_class_type.  We must

         deal with the binfo's directly as a direct base might be

         inaccessible due to ambiguity.  */

      for (vbases = CLASSTYPE_VBASECLASSES (current_class_type), i = 0;

           VEC_iterate (tree, vbases, i, binfo); i++)

        {

          init = build_base_path (PLUS_EXPR, parm, binfo, 1);

          if (move_p)

            init = move (init);

          member_init_list

            = tree_cons (binfo,

                         build_tree_list (NULL_TREE, init),

                         member_init_list);

        }

      for (binfo = TYPE_BINFO (current_class_type), i = 0;

           BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)

        {

          if (BINFO_VIRTUAL_P (base_binfo))

            continue;

          init = build_base_path (PLUS_EXPR, parm, base_binfo, 1);

          if (move_p)

            init = move (init);

          member_init_list

            = tree_cons (base_binfo,

                         build_tree_list (NULL_TREE, init),

                         member_init_list);

        }

      for (; fields; fields = TREE_CHAIN (fields))

        {

          tree field = fields;

          tree expr_type;

          if (TREE_CODE (field) != FIELD_DECL)

            continue;

          expr_type = TREE_TYPE (field);

          if (DECL_NAME (field))

            {

              if (VFIELD_NAME_P (DECL_NAME (field)))

                continue;

            }

          else if (ANON_AGGR_TYPE_P (expr_type) && TYPE_FIELDS (expr_type))

            /* Just use the field; anonymous types can't have

               nontrivial copy ctors or assignment ops.  */;

          else

            continue;

          /* Compute the type of "init->field".  If the copy-constructor

             parameter is, for example, "const S&", and the type of

             the field is "T", then the type will usually be "const

             T".  (There are no cv-qualified variants of reference

             types.)  */

          if (TREE_CODE (expr_type) != REFERENCE_TYPE)

            {

              int quals = cvquals;

              if (DECL_MUTABLE_P (field))

                quals &= ~TYPE_QUAL_CONST;

              quals |= TYPE_QUALS (expr_type);

              expr_type = cp_build_qualified_type (expr_type, quals);

            }

          init = build3 (COMPONENT_REF, expr_type, parm, field, NULL_TREE);

          if (move_p && TREE_CODE (expr_type) != REFERENCE_TYPE)

            init = move (init);

          init = build_tree_list (NULL_TREE, init);

          member_init_list = tree_cons (field, init, member_init_list);

        }

      finish_mem_initializers (member_init_list);

    }

}

static void

do_build_assign_ref (tree fndecl)

{

  tree parm = TREE_CHAIN (DECL_ARGUMENTS (fndecl));

  tree compound_stmt;

  compound_stmt = begin_compound_stmt (0);

  parm = convert_from_reference (parm);

  if (TYPE_HAS_TRIVIAL_ASSIGN_REF (current_class_type)

      && is_empty_class (current_class_type))

    /* Don't copy the padding byte; it might not have been allocated

       if *this is a base subobject.  */;

  else if (TYPE_HAS_TRIVIAL_ASSIGN_REF (current_class_type))

    {

      tree t = build2 (MODIFY_EXPR, void_type_node, current_class_ref, parm);

      finish_expr_stmt (t);

    }

  else

    {

      tree fields;

      int cvquals = cp_type_quals (TREE_TYPE (parm));

      int i;

      tree binfo, base_binfo;

      /* Assign to each of the direct base classes.  */

      for (binfo = TYPE_BINFO (current_class_type), i = 0;

           BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)

        {

          tree converted_parm;

          VEC(tree,gc) *parmvec;

          /* We must convert PARM directly to the base class

             explicitly since the base class may be ambiguous.  */

          converted_parm = build_base_path (PLUS_EXPR, parm, base_binfo, 1);

          /* Call the base class assignment operator.  */

          parmvec = make_tree_vector_single (converted_parm);

          finish_expr_stmt

            (build_special_member_call (current_class_ref,

                                        ansi_assopname (NOP_EXPR),

                                        &parmvec,

                                        base_binfo,

                                        LOOKUP_NORMAL | LOOKUP_NONVIRTUAL,

                                        tf_warning_or_error));

          release_tree_vector (parmvec);

        }

      /* Assign to each of the non-static data members.  */

      for (fields = TYPE_FIELDS (current_class_type);

           fields;

           fields = TREE_CHAIN (fields))

        {

          tree comp = current_class_ref;

          tree init = parm;

          tree field = fields;

          tree expr_type;

          int quals;

          if (TREE_CODE (field) != FIELD_DECL || DECL_ARTIFICIAL (field))

            continue;

          expr_type = TREE_TYPE (field);

          if (CP_TYPE_CONST_P (expr_type))

            {

              error ("non-static const member %q#D, can't use default "

                     "assignment operator", field);

              continue;

            }

          else if (TREE_CODE (expr_type) == REFERENCE_TYPE)

            {

              error ("non-static reference member %q#D, can't use "

                     "default assignment operator", field);

              continue;

            }

          if (DECL_NAME (field))

            {

              if (VFIELD_NAME_P (DECL_NAME (field)))

                continue;

            }

          else if (ANON_AGGR_TYPE_P (expr_type)

                   && TYPE_FIELDS (expr_type) != NULL_TREE)

            /* Just use the field; anonymous types can't have

               nontrivial copy ctors or assignment ops.  */;

          else

            continue;

          comp = build3 (COMPONENT_REF, expr_type, comp, field, NULL_TREE);

          /* Compute the type of init->field  */

          quals = cvquals;

          if (DECL_MUTABLE_P (field))

            quals &= ~TYPE_QUAL_CONST;

          expr_type = cp_build_qualified_type (expr_type, quals);

          init = build3 (COMPONENT_REF, expr_type, init, field, NULL_TREE);

          if (DECL_NAME (field))

            init = cp_build_modify_expr (comp, NOP_EXPR, init,

                                         tf_warning_or_error);

          else

            init = build2 (MODIFY_EXPR, TREE_TYPE (comp), comp, init);

          finish_expr_stmt (init);

        }

    }

  finish_return_stmt (current_class_ref);

  finish_compound_stmt (compound_stmt);

}

/* Synthesize FNDECL, a non-static member function.   */

void

synthesize_method (tree fndecl)

{

  bool nested = (current_function_decl != NULL_TREE);

  tree context = decl_function_context (fndecl);

  bool need_body = true;

  tree stmt;

  location_t save_input_location = input_location;

  int error_count = errorcount;

  int warning_count = warningcount;

  /* Reset the source location, we might have been previously

     deferred, and thus have saved where we were first needed.  */

  DECL_SOURCE_LOCATION (fndecl)

    = DECL_SOURCE_LOCATION (TYPE_NAME (DECL_CONTEXT (fndecl)));

  /* If we've been asked to synthesize a clone, just synthesize the

     cloned function instead.  Doing so will automatically fill in the

     body for the clone.  */

  if (DECL_CLONED_FUNCTION_P (fndecl))

    fndecl = DECL_CLONED_FUNCTION (fndecl);

  /* We may be in the middle of deferred access check.  Disable

     it now.  */

  push_deferring_access_checks (dk_no_deferred);

  if (! context)

    push_to_top_level ();

  else if (nested)

    push_function_context ();

  input_location = DECL_SOURCE_LOCATION (fndecl);

  start_preparsed_function (fndecl, NULL_TREE, SF_DEFAULT | SF_PRE_PARSED);

  stmt = begin_function_body ();

  if (DECL_OVERLOADED_OPERATOR_P (fndecl) == NOP_EXPR)

    {

      do_build_assign_ref (fndecl);

      need_body = false;

    }

  else if (DECL_CONSTRUCTOR_P (fndecl))

    {

      tree arg_chain = FUNCTION_FIRST_USER_PARMTYPE (fndecl);

      if (arg_chain != void_list_node)

        do_build_copy_constructor (fndecl);

      else

        finish_mem_initializers (NULL_TREE);

    }

  /* If we haven't yet generated the body of the function, just

     generate an empty compound statement.  */

  if (need_body)

    {

      tree compound_stmt;

      compound_stmt = begin_compound_stmt (BCS_FN_BODY);

      finish_compound_stmt (compound_stmt);

    }

  finish_function_body (stmt);

  expand_or_defer_fn (finish_function (0));

  input_location = save_input_location;

  if (! context)

    pop_from_top_level ();

  else if (nested)