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 /*

  * Copyright (c) 2011, 2012, 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

  * questions.

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  */

 #ifndef SHARE_VM_OOPS_FIELDSTREAMS_HPP

 #define SHARE_VM_OOPS_FIELDSTREAMS_HPP

 #include "oops/instanceKlass.hpp"

 #include "oops/fieldInfo.hpp"

 // The is the base class for iteration over the fields array

 // describing the declared fields in the class.  Several subclasses

 // are provided depending on the kind of iteration required.  The

 // JavaFieldStream is for iterating over regular Java fields and it

 // generally the preferred iterator.  InternalFieldStream only

 // iterates over fields that have been injected by the JVM.

 // AllFieldStream exposes all fields and should only be used in rare

 // cases.

 class FieldStreamBase : public StackObj {

  protected:

   Array<u2>*          _fields;

   constantPoolHandle  _constants;

   int                 _index;

   int                 _limit;

   int                 _generic_signature_slot;

   FieldInfo* field() const { return FieldInfo::from_field_array(_fields, _index); }

   int init_generic_signature_start_slot() {

     int length = _fields->length();

     int num_fields = 0;

     int skipped_generic_signature_slots = 0;

     FieldInfo* fi;

     AccessFlags flags;

     /* Scan from 0 to the current _index. Count the number of generic

        signature slots for field[0] to field[_index - 1]. */

     for (int i = 0; i < _index; i++) {

       fi = FieldInfo::from_field_array(_fields, i);

       flags.set_flags(fi->access_flags());

       if (flags.field_has_generic_signature()) {

         length --;

         skipped_generic_signature_slots ++;

       }

     }

     /* Scan from the current _index. */

     for (int i = _index; i*FieldInfo::field_slots < length; i++) {

       fi = FieldInfo::from_field_array(_fields, i);

       flags.set_flags(fi->access_flags());

       if (flags.field_has_generic_signature()) {

         length --;

       }

       num_fields ++;

     }

     _generic_signature_slot = length + skipped_generic_signature_slots;

     assert(_generic_signature_slot <= _fields->length(), "");

     return num_fields;

   }

   FieldStreamBase(Array<u2>* fields, constantPoolHandle constants, int start, int limit) {

     _fields = fields;

     _constants = constants;

     _index = start;

     int num_fields = init_generic_signature_start_slot();

     if (limit < start) {

       _limit = num_fields;

     } else {

       _limit = limit;

     }

   }

   FieldStreamBase(Array<u2>* fields, constantPoolHandle constants) {

     _fields = fields;

     _constants = constants;

     _index = 0;

     _limit = init_generic_signature_start_slot();

   }

  public:

   FieldStreamBase(InstanceKlass* klass) {

     _fields = klass->fields();

     _constants = klass->constants();

     _index = 0;

     _limit = klass->java_fields_count();

     init_generic_signature_start_slot();

   }

   FieldStreamBase(instanceKlassHandle klass) {

     _fields = klass->fields();

     _constants = klass->constants();

     _index = 0;

     _limit = klass->java_fields_count();

     init_generic_signature_start_slot();

   }

   // accessors

   int index() const                 { return _index; }

   void next() {

     if (access_flags().field_has_generic_signature()) {

       _generic_signature_slot ++;

       assert(_generic_signature_slot <= _fields->length(), "");

     }

     _index += 1;

   }

   bool done() const { return _index >= _limit; }

   // Accessors for current field

   AccessFlags access_flags() const {

     AccessFlags flags;

     flags.set_flags(field()->access_flags());

     return flags;

   }

   void set_access_flags(u2 flags) const {

     field()->set_access_flags(flags);

   }

   void set_access_flags(AccessFlags flags) const {

     set_access_flags(flags.as_short());

   }

   Symbol* name() const {

     return field()->name(_constants);

   }

   Symbol* signature() const {

     return field()->signature(_constants);

   }

   Symbol* generic_signature() const {

     if (access_flags().field_has_generic_signature()) {

       assert(_generic_signature_slot < _fields->length(), "out of bounds");

       int index = _fields->at(_generic_signature_slot);

       return _constants->symbol_at(index);

     } else {

       return NULL;

     }

   }

   int offset() const {

     return field()->offset();

   }

   int allocation_type() const {

     return field()->allocation_type();

   }

   void set_offset(int offset) {

     field()->set_offset(offset);

   }

   bool is_offset_set() const {

     return field()->is_offset_set();

   }

   bool is_contended() const {

     return field()->is_contended();

   }

   int contended_group() const {

     return field()->contended_group();

   }

 };

 // Iterate over only the internal fields

 class JavaFieldStream : public FieldStreamBase {

  public:

   JavaFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), 0, k->java_fields_count()) {}

   int name_index() const {

     assert(!field()->is_internal(), "regular only");

     return field()->name_index();

   }

   void set_name_index(int index) {

     assert(!field()->is_internal(), "regular only");

     field()->set_name_index(index);

   }

   int signature_index() const {

     assert(!field()->is_internal(), "regular only");

     return field()->signature_index();

   }

   void set_signature_index(int index) {

     assert(!field()->is_internal(), "regular only");

     field()->set_signature_index(index);

   }

   int generic_signature_index() const {

     assert(!field()->is_internal(), "regular only");

     if (access_flags().field_has_generic_signature()) {

       assert(_generic_signature_slot < _fields->length(), "out of bounds");

       return _fields->at(_generic_signature_slot);

     } else {

       return 0;

     }

   }

   void set_generic_signature_index(int index) {

     assert(!field()->is_internal(), "regular only");

     if (access_flags().field_has_generic_signature()) {

       assert(_generic_signature_slot < _fields->length(), "out of bounds");

       _fields->at_put(_generic_signature_slot, index);

     }

   }

   int initval_index() const {

     assert(!field()->is_internal(), "regular only");

     return field()->initval_index();

   }

   void set_initval_index(int index) {

     assert(!field()->is_internal(), "regular only");

     return field()->set_initval_index(index);

   }

 };

 // Iterate over only the internal fields

 class InternalFieldStream : public FieldStreamBase {

  public:

   InternalFieldStream(InstanceKlass* k):      FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {}

   InternalFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants(), k->java_fields_count(), 0) {}

 };

 class AllFieldStream : public FieldStreamBase {

  public:

   AllFieldStream(Array<u2>* fields, constantPoolHandle constants): FieldStreamBase(fields, constants) {}

   AllFieldStream(InstanceKlass* k):      FieldStreamBase(k->fields(), k->constants()) {}

   AllFieldStream(instanceKlassHandle k): FieldStreamBase(k->fields(), k->constants()) {}

 };

 #endif // SHARE_VM_OOPS_FIELDSTREAMS_HPP