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 /*

  * Copyright (c) 1997, 2013, 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

  * or visit www.oracle.com if you need additional information or have any

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  */

 #ifndef SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP

 #define SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP

 #include "oops/constantPool.hpp"

 #include "oops/symbol.hpp"

 #include "runtime/fieldType.hpp"

 #include "utilities/accessFlags.hpp"

 #include "utilities/constantTag.hpp"

 // A fieldDescriptor describes the attributes of a single field (instance or class variable).

 // It needs the class constant pool to work (because it only holds indices into the pool

 // rather than the actual info).

 class fieldDescriptor VALUE_OBJ_CLASS_SPEC {

  private:

   AccessFlags         _access_flags;

   int                 _index; // the field index

   constantPoolHandle  _cp;

   // update the access_flags for the field in the klass

   void update_klass_field_access_flag() {

     InstanceKlass* ik = field_holder();

     ik->field(index())->set_access_flags(_access_flags.as_short());

   }

   FieldInfo* field() const {

     InstanceKlass* ik = field_holder();

     return ik->field(_index);

   }

  public:

   fieldDescriptor() {

     DEBUG_ONLY(_index = badInt);

   }

   fieldDescriptor(InstanceKlass* ik, int index) {

     DEBUG_ONLY(_index = badInt);

     reinitialize(ik, index);

   }

   Symbol* name() const {

     return field()->name(_cp);

   }

   Symbol* signature() const {

     return field()->signature(_cp);

   }

   InstanceKlass* field_holder()   const    { return _cp->pool_holder(); }

   ConstantPool* constants()       const    { return _cp(); }

   AccessFlags access_flags()      const    { return _access_flags; }

   oop loader()                    const;

   // Offset (in words) of field from start of instanceOop / Klass*

   int offset()                    const    { return field()->offset(); }

   Symbol* generic_signature()     const;

   int index()                     const    { return _index; }

   AnnotationArray* annotations()  const;

   AnnotationArray* type_annotations()  const;

   // Initial field value

   bool has_initial_value()        const    { return field()->initval_index() != 0; }

   int initial_value_index()       const    { return field()->initval_index(); }

   constantTag initial_value_tag() const;  // The tag will return true on one of is_int(), is_long(), is_single(), is_double()

   jint int_initial_value()        const;

   jlong long_initial_value()      const;

   jfloat float_initial_value()    const;

   jdouble double_initial_value()  const;

   oop string_initial_value(TRAPS) const;

   // Field signature type

   BasicType field_type()          const    { return FieldType::basic_type(signature()); }

   // Access flags

   bool is_public()                const    { return access_flags().is_public(); }

   bool is_private()               const    { return access_flags().is_private(); }

   bool is_protected()             const    { return access_flags().is_protected(); }

   bool is_package_private()       const    { return !is_public() && !is_private() && !is_protected(); }

   bool is_static()                const    { return access_flags().is_static(); }

   bool is_final()                 const    { return access_flags().is_final(); }

   bool is_volatile()              const    { return access_flags().is_volatile(); }

   bool is_transient()             const    { return access_flags().is_transient(); }

   bool is_synthetic()             const    { return access_flags().is_synthetic(); }

   bool is_field_access_watched()  const    { return access_flags().is_field_access_watched(); }

   bool is_field_modification_watched() const

                                            { return access_flags().is_field_modification_watched(); }

   bool has_initialized_final_update() const { return access_flags().has_field_initialized_final_update(); }

   bool has_generic_signature()    const    { return access_flags().field_has_generic_signature(); }

   void set_is_field_access_watched(const bool value) {

     _access_flags.set_is_field_access_watched(value);

     update_klass_field_access_flag();

   }

   void set_is_field_modification_watched(const bool value) {

     _access_flags.set_is_field_modification_watched(value);

     update_klass_field_access_flag();

   }

   void set_has_initialized_final_update(const bool value) {

     _access_flags.set_has_field_initialized_final_update(value);

     update_klass_field_access_flag();

   }

   // Initialization

   void reinitialize(InstanceKlass* ik, int index);

   // Print

   void print() { print_on(tty); }

   void print_on(outputStream* st) const         PRODUCT_RETURN;

   void print_on_for(outputStream* st, oop obj)  PRODUCT_RETURN;

   void verify() const                           PRODUCT_RETURN;

 };

 #endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP