/*

 * Copyright (c) 2014, 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 "classfile/classLoaderData.inline.hpp"

#include "classfile/classLoaderStats.hpp"

#include "oops/oop.inline.hpp"

#include "utilities/globalDefinitions.hpp"

class ClassStatsClosure : public KlassClosure {

public:

  int _num_classes;

  ClassStatsClosure() :

    _num_classes(0) {

  }

  virtual void do_klass(Klass* k) {

    _num_classes++;

  }

};

void ClassLoaderStatsClosure::do_cld(ClassLoaderData* cld) {

  oop cl = cld->class_loader();

  ClassLoaderStats* cls;

  // The hashtable key is the ClassLoader oop since we want to account

  // for "real" classes and anonymous classes together

  ClassLoaderStats** cls_ptr = _stats->get(cl);

  if (cls_ptr == NULL) {

    cls = new ClassLoaderStats();

    _stats->put(cl, cls);

    _total_loaders++;

  } else {

    cls = *cls_ptr;

  }

  if (!cld->is_unsafe_anonymous()) {

    cls->_cld = cld;

  }

  cls->_class_loader = cl;

  if (cl != NULL) {

    cls->_parent = java_lang_ClassLoader::parent(cl);

    addEmptyParents(cls->_parent);

  }

  ClassStatsClosure csc;

  cld->classes_do(&csc);

  if(cld->is_unsafe_anonymous()) {

    cls->_anon_classes_count += csc._num_classes;

  } else {

    cls->_classes_count = csc._num_classes;

  }

  _total_classes += csc._num_classes;

  ClassLoaderMetaspace* ms = cld->metaspace_or_null();

  if (ms != NULL) {

    if(cld->is_unsafe_anonymous()) {

      cls->_anon_chunk_sz += ms->allocated_chunks_bytes();

      cls->_anon_block_sz += ms->allocated_blocks_bytes();

    } else {

      cls->_chunk_sz = ms->allocated_chunks_bytes();

      cls->_block_sz = ms->allocated_blocks_bytes();

    }

    _total_chunk_sz += ms->allocated_chunks_bytes();

    _total_block_sz += ms->allocated_blocks_bytes();

  }

}

// Handles the difference in pointer width on 32 and 64 bit platforms

#ifdef _LP64

  #define SPACE "%8s"

#else

  #define SPACE "%s"

#endif

bool ClassLoaderStatsClosure::do_entry(oop const& key, ClassLoaderStats* const& cls) {

  Klass* class_loader_klass = (cls->_class_loader == NULL ? NULL : cls->_class_loader->klass());

  Klass* parent_klass = (cls->_parent == NULL ? NULL : cls->_parent->klass());

  _out->print(INTPTR_FORMAT "  " INTPTR_FORMAT "  " INTPTR_FORMAT "  " UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "  ",

      p2i(class_loader_klass), p2i(parent_klass), p2i(cls->_cld),

      cls->_classes_count,

      cls->_chunk_sz, cls->_block_sz);

  if (class_loader_klass != NULL) {

    _out->print("%s", class_loader_klass->external_name());

  } else {

    _out->print("<boot class loader>");

  }

  _out->cr();

  if (cls->_anon_classes_count > 0) {

    _out->print_cr(SPACE SPACE SPACE "                                    " UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "   + unsafe anonymous classes",

        "", "", "",

        cls->_anon_classes_count,

        cls->_anon_chunk_sz, cls->_anon_block_sz);

  }

  return true;

}

void ClassLoaderStatsClosure::print() {

  _out->print_cr("ClassLoader" SPACE " Parent" SPACE "      CLD*" SPACE "       Classes   ChunkSz   BlockSz  Type", "", "", "");

  _stats->iterate(this);

  _out->print("Total = " UINTX_FORMAT_W(-6), _total_loaders);

  _out->print(SPACE SPACE SPACE "                      ", "", "", "");

  _out->print_cr(UINTX_FORMAT_W(6) "  " SIZE_FORMAT_W(8) "  " SIZE_FORMAT_W(8) "  ",

      _total_classes,

      _total_chunk_sz,

      _total_block_sz);

  _out->print_cr("ChunkSz: Total size of all allocated metaspace chunks");

  _out->print_cr("BlockSz: Total size of all allocated metaspace blocks (each chunk has several blocks)");

}

void ClassLoaderStatsClosure::addEmptyParents(oop cl) {

  while (cl != NULL && java_lang_ClassLoader::loader_data_acquire(cl) == NULL) {

    // This classloader has not loaded any classes

    ClassLoaderStats** cls_ptr = _stats->get(cl);

    if (cls_ptr == NULL) {

      // It does not exist in our table - add it

      ClassLoaderStats* cls = new ClassLoaderStats();

      cls->_class_loader = cl;

      cls->_parent = java_lang_ClassLoader::parent(cl);

      _stats->put(cl, cls);

      _total_loaders++;

    }

    cl = java_lang_ClassLoader::parent(cl);

  }

}

void ClassLoaderStatsVMOperation::doit() {

  ClassLoaderStatsClosure clsc (_out);

  ClassLoaderDataGraph::cld_do(&clsc);

  clsc.print();

}

void ClassLoaderStatsDCmd::execute(DCmdSource source, TRAPS) {

  ClassLoaderStatsVMOperation op(output());

  VMThread::execute(&op);

}