/*

 * Copyright (c) 1997, 2019, 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.

 *

 */

#include "precompiled.hpp"

#include "classfile/systemDictionary.hpp"

#include "classfile/vmSymbols.hpp"

#include "memory/resourceArea.hpp"

#include "oops/annotations.hpp"

#include "oops/constantPool.hpp"

#include "oops/instanceKlass.hpp"

#include "oops/oop.inline.hpp"

#include "oops/fieldStreams.hpp"

#include "runtime/fieldDescriptor.inline.hpp"

#include "runtime/handles.inline.hpp"

#include "runtime/signature.hpp"

oop fieldDescriptor::loader() const {

  return _cp->pool_holder()->class_loader();

}

Symbol* fieldDescriptor::generic_signature() const {

  if (!has_generic_signature()) {

    return NULL;

  }

  int idx = 0;

  InstanceKlass* ik = field_holder();

  for (AllFieldStream fs(ik); !fs.done(); fs.next()) {

    if (idx == _index) {

      return fs.generic_signature();

    } else {

      idx ++;

    }

  }

  assert(false, "should never happen");

  return NULL;

}

AnnotationArray* fieldDescriptor::annotations() const {

  InstanceKlass* ik = field_holder();

  Array<AnnotationArray*>* md = ik->fields_annotations();

  if (md == NULL)

    return NULL;

  return md->at(index());

}

AnnotationArray* fieldDescriptor::type_annotations() const {

  InstanceKlass* ik = field_holder();

  Array<AnnotationArray*>* type_annos = ik->fields_type_annotations();

  if (type_annos == NULL)

    return NULL;

  return type_annos->at(index());

}

constantTag fieldDescriptor::initial_value_tag() const {

  return constants()->tag_at(initial_value_index());

}

jint fieldDescriptor::int_initial_value() const {

  return constants()->int_at(initial_value_index());

}

jlong fieldDescriptor::long_initial_value() const {

  return constants()->long_at(initial_value_index());

}

jfloat fieldDescriptor::float_initial_value() const {

  return constants()->float_at(initial_value_index());

}

jdouble fieldDescriptor::double_initial_value() const {

  return constants()->double_at(initial_value_index());

}

oop fieldDescriptor::string_initial_value(TRAPS) const {

  return constants()->uncached_string_at(initial_value_index(), THREAD);

}

void fieldDescriptor::reinitialize(InstanceKlass* ik, int index) {

  if (_cp.is_null() || field_holder() != ik) {

    _cp = constantPoolHandle(Thread::current(), ik->constants());

    // _cp should now reference ik's constant pool; i.e., ik is now field_holder.

    assert(field_holder() == ik, "must be already initialized to this class");

  }

  FieldInfo* f = ik->field(index);

  assert(!f->is_internal(), "regular Java fields only");

  _access_flags = accessFlags_from(f->access_flags());

  guarantee(f->name_index() != 0 && f->signature_index() != 0, "bad constant pool index for fieldDescriptor");

  _index = index;

  verify();

}

#ifndef PRODUCT

void fieldDescriptor::verify() const {

  if (_cp.is_null()) {

    assert(_index == badInt, "constructor must be called");  // see constructor

  } else {

    assert(_index >= 0, "good index");

    assert(_index < field_holder()->java_fields_count(), "oob");

  }

}

void fieldDescriptor::print_on(outputStream* st) const {

  access_flags().print_on(st);

  name()->print_value_on(st);

  st->print(" ");

  signature()->print_value_on(st);

  st->print(" @%d ", offset());

  if (WizardMode && has_initial_value()) {

    st->print("(initval ");

    constantTag t = initial_value_tag();

    if (t.is_int()) {

      st->print("int %d)", int_initial_value());

    } else if (t.is_long()){

      st->print_jlong(long_initial_value());

    } else if (t.is_float()){

      st->print("float %f)", float_initial_value());

    } else if (t.is_double()){

      st->print("double %lf)", double_initial_value());

    }

  }

}

void fieldDescriptor::print() const { print_on(tty); }

void fieldDescriptor::print_on_for(outputStream* st, oop obj) {

  print_on(st);

  BasicType ft = field_type();

  jint as_int = 0;

  switch (ft) {

    case T_BYTE:

      as_int = (jint)obj->byte_field(offset());

      st->print(" %d", obj->byte_field(offset()));

      break;

    case T_CHAR:

      as_int = (jint)obj->char_field(offset());

      {

        jchar c = obj->char_field(offset());

        as_int = c;

        st->print(" %c %d", isprint(c) ? c : ' ', c);

      }

      break;

    case T_DOUBLE:

      st->print(" %lf", obj->double_field(offset()));

      break;

    case T_FLOAT:

      as_int = obj->int_field(offset());

      st->print(" %f", obj->float_field(offset()));

      break;

    case T_INT:

      as_int = obj->int_field(offset());

      st->print(" %d", obj->int_field(offset()));

      break;

    case T_LONG:

      st->print(" ");

      st->print_jlong(obj->long_field(offset()));

      break;

    case T_SHORT:

      as_int = obj->short_field(offset());

      st->print(" %d", obj->short_field(offset()));

      break;

    case T_BOOLEAN:

      as_int = obj->bool_field(offset());

      st->print(" %s", obj->bool_field(offset()) ? "true" : "false");

      break;

    case T_ARRAY:

      st->print(" ");

      NOT_LP64(as_int = obj->int_field(offset()));

      if (obj->obj_field(offset()) != NULL) {

        obj->obj_field(offset())->print_value_on(st);

      } else {

        st->print_cr("NULL");

      }

      break;

    case T_OBJECT:

      st->print(" ");

      NOT_LP64(as_int = obj->int_field(offset()));

      if (obj->obj_field(offset()) != NULL) {

        obj->obj_field(offset())->print_value_on(st);

      } else {

        st->print_cr("NULL");

      }

      break;

    default:

      ShouldNotReachHere();

      break;

  }

  // Print a hint as to the underlying integer representation. This can be wrong for

  // pointers on an LP64 machine

#ifdef _LP64

  if (is_reference_type(ft) && UseCompressedOops) {

    st->print(" (%x)", obj->int_field(offset()));

  }

  else // <- intended

#endif

  if (ft == T_LONG || ft == T_DOUBLE LP64_ONLY(|| !is_java_primitive(ft)) ) {

    st->print(" (%x %x)", obj->int_field(offset()), obj->int_field(offset()+sizeof(jint)));

  } else if (as_int < 0 || as_int > 9) {

    st->print(" (%x)", as_int);

  }

}

#endif /* PRODUCT */