/*

 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 *

 */

#ifndef SHARE_VM_RUNTIME_FIELDTYPE_HPP

#define SHARE_VM_RUNTIME_FIELDTYPE_HPP

#include "memory/allocation.hpp"

#include "oops/symbol.hpp"

// Note: FieldType should be based on the SignatureIterator (or vice versa).

//       In any case, this structure should be re-thought at some point.

// A FieldType is used to determine the type of a field from a signature string.

// Information returned by get_array_info, which is scoped to decrement

// reference count if a Symbol is created in the case of T_OBJECT

class FieldArrayInfo : public StackObj {

  friend class FieldType;  // field type can set these fields.

  int       _dimension;

  Symbol*   _object_key;

 public:

  int       dimension()    { return _dimension; }

  Symbol*   object_key()   { return _object_key; }

  // basic constructor

  FieldArrayInfo() : _dimension(0), _object_key(NULL) {}

  // destructor decrements object key's refcount if created

  ~FieldArrayInfo() { if (_object_key != NULL) _object_key->decrement_refcount(); }

};

class FieldType: public AllStatic {

 private:

  static void skip_optional_size(Symbol* signature, int* index);

  static bool is_valid_array_signature(Symbol* signature);

 public:

  // Return basic type

  static BasicType basic_type(Symbol* signature);

  // Testing

  static bool is_array(Symbol* signature) { return signature->utf8_length() > 1 && signature->byte_at(0) == '[' && is_valid_array_signature(signature); }

  static bool is_obj(Symbol* signature) {

     int sig_length = signature->utf8_length();

     // Must start with 'L' and end with ';'

     return (sig_length >= 2 &&

             (signature->byte_at(0) == 'L') &&

             (signature->byte_at(sig_length - 1) == ';'));

  }

  // Parse field and extract array information. Works for T_ARRAY only.

  static BasicType get_array_info(Symbol* signature, FieldArrayInfo& ai, TRAPS);

};

#endif // SHARE_VM_RUNTIME_FIELDTYPE_HPP