// This file is part of PUMA.
// Copyright (C) 1999-2003  The PUMA developer team.
//
// 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 2 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, write to the Free
// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
// MA  02111-1307  USA

#ifndef __ext_gnu_csemantic_ah__
#define __ext_gnu_csemantic_ah__

#include "Puma/CTree.h"

namespace Puma {

// C Semantic extension
slice class Puma::ExtGnuLocalLabelStmtSemantic {
public:
  CTree *introduce_local_label ();
  bool gnu_introduce_label (CTree *&);
};

slice Puma::CTree * Puma::ExtGnuLocalLabelStmtSemantic::introduce_local_label () {
  Puma::CTree *tree = builder ().gnu_local_label_stmt ();
  if (tree->NodeName () != CT_GnuLocalLabelStmt::NodeId ())
    return tree;

  if (! current_scope->LocalScope ()) {
    SEM_ERROR (tree, "label declaration outside of function");
    builder ().destroyNode (tree);
    return (CTree*)0;
  }

  CFunctionInfo *fct = current_scope->LocalScope ()->Function ();
  // be careful: tricky casts necessary, because of multiple inheritance!
  CT_GnuLocalLabelStmt *ls = (CT_GnuLocalLabelStmt *)(CT_List*)tree;

  for (int e = 0; e < ls->Entries (); e++) {
    CT_SimpleName *sn = (CT_SimpleName*)ls->Entry (e);
    const char *name = sn->Text ();
    if (fct->findLocalLabel (name, current_scope)) {
      SEM_ERROR__duplicate (tree, "local label declaration", sn);
    }
    else {
      fct->registerLocalLabel (name, current_scope);
    }
  }
  return tree;
}

slice bool Puma::ExtGnuLocalLabelStmtSemantic::gnu_introduce_label (CTree *&tree) {
  CFunctionInfo *fct;
  CLabelInfo *info;
  const char *name;
  CT_LabelStmt *ls;

  ls = (CT_LabelStmt*) tree;
  if (ls->NodeName () != CT_LabelStmt::NodeId ())
    return true;

  name = ls->Label ()->Text ();
  if (! current_scope->LocalScope ()) {
    SEM_ERROR (ls->Label (), "label `" << name << "' outside of function");
    builder ().destroyNode (ls);
    tree = (CTree*)0;
    return true;
  }

  fct = current_scope->LocalScope ()->Function ();
  if ((info = fct->findLocalLabel (name, current_scope, true)) != 0) {
    if (info->Tree ()) {
      SEM_ERROR__duplicate (ls, "local label", ls->Label ());
      builder ().destroyNode (ls);
      tree = (CTree*)0;
      return true;
    }
    info->Tree (ls);
  }
  else {
    // do the standard label handling
    return false;
  }
  return true;
}

} // namespace Puma

#endif /* __ext_gnu_csemantic_ah__ */