/*

 * Copyright (c) 1997, 2018, 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 "code/debugInfo.hpp"

#include "code/debugInfoRec.hpp"

#include "code/nmethod.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/handles.inline.hpp"

#include "runtime/jniHandles.inline.hpp"

#include "runtime/thread.hpp"

// Constructors

DebugInfoWriteStream::DebugInfoWriteStream(DebugInformationRecorder* recorder, int initial_size)

: CompressedWriteStream(initial_size) {

  _recorder = recorder;

}

// Serializing oops

void DebugInfoWriteStream::write_handle(jobject h) {

  write_int(recorder()->oop_recorder()->find_index(h));

}

void DebugInfoWriteStream::write_metadata(Metadata* h) {

  write_int(recorder()->oop_recorder()->find_index(h));

}

oop DebugInfoReadStream::read_oop() {

  oop o = code()->oop_at(read_int());

  assert(oopDesc::is_oop_or_null(o), "oop only");

  return o;

}

ScopeValue* DebugInfoReadStream::read_object_value() {

  int id = read_int();

#ifdef ASSERT

  assert(_obj_pool != NULL, "object pool does not exist");

  for (int i = _obj_pool->length() - 1; i >= 0; i--) {

    assert(_obj_pool->at(i)->as_ObjectValue()->id() != id, "should not be read twice");

  }

#endif

  ObjectValue* result = new ObjectValue(id);

  // Cache the object since an object field could reference it.

  _obj_pool->push(result);

  result->read_object(this);

  return result;

}

ScopeValue* DebugInfoReadStream::get_cached_object() {

  int id = read_int();

  assert(_obj_pool != NULL, "object pool does not exist");

  for (int i = _obj_pool->length() - 1; i >= 0; i--) {

    ObjectValue* ov = _obj_pool->at(i)->as_ObjectValue();

    if (ov->id() == id) {

      return ov;

    }

  }

  ShouldNotReachHere();

  return NULL;

}

// Serializing scope values

enum { LOCATION_CODE = 0, CONSTANT_INT_CODE = 1,  CONSTANT_OOP_CODE = 2,

                          CONSTANT_LONG_CODE = 3, CONSTANT_DOUBLE_CODE = 4,

                          OBJECT_CODE = 5,        OBJECT_ID_CODE = 6 };

ScopeValue* ScopeValue::read_from(DebugInfoReadStream* stream) {

  ScopeValue* result = NULL;

  switch(stream->read_int()) {

   case LOCATION_CODE:        result = new LocationValue(stream);        break;

   case CONSTANT_INT_CODE:    result = new ConstantIntValue(stream);     break;

   case CONSTANT_OOP_CODE:    result = new ConstantOopReadValue(stream); break;

   case CONSTANT_LONG_CODE:   result = new ConstantLongValue(stream);    break;

   case CONSTANT_DOUBLE_CODE: result = new ConstantDoubleValue(stream);  break;

   case OBJECT_CODE:          result = stream->read_object_value();      break;

   case OBJECT_ID_CODE:       result = stream->get_cached_object();      break;

   default: ShouldNotReachHere();

  }

  return result;

}

// LocationValue

LocationValue::LocationValue(DebugInfoReadStream* stream) {

  _location = Location(stream);

}

void LocationValue::write_on(DebugInfoWriteStream* stream) {

  stream->write_int(LOCATION_CODE);

  location().write_on(stream);

}

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

  location().print_on(st);

}

// ObjectValue

void ObjectValue::read_object(DebugInfoReadStream* stream) {

  _klass = read_from(stream);

  assert(_klass->is_constant_oop(), "should be constant java mirror oop");

  int length = stream->read_int();

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

    ScopeValue* val = read_from(stream);

    _field_values.append(val);

  }

}

void ObjectValue::write_on(DebugInfoWriteStream* stream) {

  if (_visited) {

    stream->write_int(OBJECT_ID_CODE);

    stream->write_int(_id);

  } else {

    _visited = true;

    stream->write_int(OBJECT_CODE);

    stream->write_int(_id);

    _klass->write_on(stream);

    int length = _field_values.length();

    stream->write_int(length);

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

      _field_values.at(i)->write_on(stream);

    }

  }

}

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

  st->print("obj[%d]", _id);

}

void ObjectValue::print_fields_on(outputStream* st) const {

#ifndef PRODUCT

  if (_field_values.length() > 0) {

    _field_values.at(0)->print_on(st);

  }

  for (int i = 1; i < _field_values.length(); i++) {

    st->print(", ");

    _field_values.at(i)->print_on(st);

  }

#endif

}

// ConstantIntValue

ConstantIntValue::ConstantIntValue(DebugInfoReadStream* stream) {

  _value = stream->read_signed_int();

}

void ConstantIntValue::write_on(DebugInfoWriteStream* stream) {

  stream->write_int(CONSTANT_INT_CODE);

  stream->write_signed_int(value());

}

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

  st->print("%d", value());

}

// ConstantLongValue

ConstantLongValue::ConstantLongValue(DebugInfoReadStream* stream) {

  _value = stream->read_long();

}

void ConstantLongValue::write_on(DebugInfoWriteStream* stream) {

  stream->write_int(CONSTANT_LONG_CODE);

  stream->write_long(value());

}

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

  st->print(JLONG_FORMAT, value());

}

// ConstantDoubleValue

ConstantDoubleValue::ConstantDoubleValue(DebugInfoReadStream* stream) {

  _value = stream->read_double();

}

void ConstantDoubleValue::write_on(DebugInfoWriteStream* stream) {

  stream->write_int(CONSTANT_DOUBLE_CODE);

  stream->write_double(value());

}

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

  st->print("%f", value());

}

// ConstantOopWriteValue

void ConstantOopWriteValue::write_on(DebugInfoWriteStream* stream) {

#ifdef ASSERT

  {

    // cannot use ThreadInVMfromNative here since in case of JVMCI compiler,

    // thread is already in VM state.

    ThreadInVMfromUnknown tiv;

    assert(JNIHandles::resolve(value()) == NULL ||

           Universe::heap()->is_in_reserved(JNIHandles::resolve(value())),

           "Should be in heap");

 }

#endif

  stream->write_int(CONSTANT_OOP_CODE);

  stream->write_handle(value());

}

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

  // using ThreadInVMfromUnknown here since in case of JVMCI compiler,

  // thread is already in VM state.

  ThreadInVMfromUnknown tiv;

  JNIHandles::resolve(value())->print_value_on(st);

}

// ConstantOopReadValue

ConstantOopReadValue::ConstantOopReadValue(DebugInfoReadStream* stream) {

  _value = Handle(Thread::current(), stream->read_oop());

  assert(_value() == NULL ||

         Universe::heap()->is_in_reserved(_value()), "Should be in heap");

}

void ConstantOopReadValue::write_on(DebugInfoWriteStream* stream) {

  ShouldNotReachHere();

}

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

  value()()->print_value_on(st);

}

// MonitorValue

MonitorValue::MonitorValue(ScopeValue* owner, Location basic_lock, bool eliminated) {

  _owner       = owner;

  _basic_lock  = basic_lock;

  _eliminated  = eliminated;

}

MonitorValue::MonitorValue(DebugInfoReadStream* stream) {

  _basic_lock  = Location(stream);

  _owner       = ScopeValue::read_from(stream);

  _eliminated  = (stream->read_bool() != 0);

}

void MonitorValue::write_on(DebugInfoWriteStream* stream) {

  _basic_lock.write_on(stream);

  _owner->write_on(stream);

  stream->write_bool(_eliminated);

}

#ifndef PRODUCT

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

  st->print("monitor{");

  owner()->print_on(st);

  st->print(",");

  basic_lock().print_on(st);

  st->print("}");

  if (_eliminated) {

    st->print(" (eliminated)");

  }

}

#endif