/*

 * Copyright (c) 2002, 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/moduleEntry.hpp"

#include "classfile/systemDictionary.hpp"

#include "gc/shared/collectedHeap.hpp"

#include "memory/heapInspection.hpp"

#include "memory/resourceArea.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/os.hpp"

#include "utilities/globalDefinitions.hpp"

#include "utilities/macros.hpp"

#include "utilities/stack.inline.hpp"

// HeapInspection

int KlassSizeStats::count(oop x) {

  return (HeapWordSize * (((x) != NULL) ? (x)->size() : 0));

}

int KlassSizeStats::count_array(objArrayOop x) {

  return (HeapWordSize * (((x) != NULL) ? (x)->size() : 0));

}

inline KlassInfoEntry::~KlassInfoEntry() {

  if (_subclasses != NULL) {

    delete _subclasses;

  }

}

inline void KlassInfoEntry::add_subclass(KlassInfoEntry* cie) {

  if (_subclasses == NULL) {

    _subclasses = new  (ResourceObj::C_HEAP, mtInternal) GrowableArray<KlassInfoEntry*>(4, true);

  }

  _subclasses->append(cie);

}

int KlassInfoEntry::compare(KlassInfoEntry* e1, KlassInfoEntry* e2) {

  if(e1->_instance_words > e2->_instance_words) {

    return -1;

  } else if(e1->_instance_words < e2->_instance_words) {

    return 1;

  }

  // Sort alphabetically, note 'Z' < '[' < 'a', but it's better to group

  // the array classes before all the instance classes.

  ResourceMark rm;

  const char* name1 = e1->klass()->external_name();

  const char* name2 = e2->klass()->external_name();

  bool d1 = (name1[0] == '[');

  bool d2 = (name2[0] == '[');

  if (d1 && !d2) {

    return -1;

  } else if (d2 && !d1) {

    return 1;

  } else {

    return strcmp(name1, name2);

  }

}

const char* KlassInfoEntry::name() const {

  const char* name;

  if (_klass->name() != NULL) {

    name = _klass->external_name();

  } else {

    if (_klass == Universe::boolArrayKlassObj())         name = "<boolArrayKlass>";         else

    if (_klass == Universe::charArrayKlassObj())         name = "<charArrayKlass>";         else

    if (_klass == Universe::singleArrayKlassObj())       name = "<singleArrayKlass>";       else

    if (_klass == Universe::doubleArrayKlassObj())       name = "<doubleArrayKlass>";       else

    if (_klass == Universe::byteArrayKlassObj())         name = "<byteArrayKlass>";         else

    if (_klass == Universe::shortArrayKlassObj())        name = "<shortArrayKlass>";        else

    if (_klass == Universe::intArrayKlassObj())          name = "<intArrayKlass>";          else

    if (_klass == Universe::longArrayKlassObj())         name = "<longArrayKlass>";         else

      name = "<no name>";

  }

  return name;

}

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

  ResourceMark rm;

  // simplify the formatting (ILP32 vs LP64) - always cast the numbers to 64-bit

  ModuleEntry* module = _klass->module();

  if (module->is_named()) {

    st->print_cr(INT64_FORMAT_W(13) "  " UINT64_FORMAT_W(13) "  %s (%s@%s)",

                 (int64_t)_instance_count,

                 (uint64_t)_instance_words * HeapWordSize,

                 name(),

                 module->name()->as_C_string(),

                 module->version() != NULL ? module->version()->as_C_string() : "");

  } else {

    st->print_cr(INT64_FORMAT_W(13) "  " UINT64_FORMAT_W(13) "  %s",

                 (int64_t)_instance_count,

                 (uint64_t)_instance_words * HeapWordSize,

                 name());

  }

}

KlassInfoEntry* KlassInfoBucket::lookup(Klass* const k) {

  KlassInfoEntry* elt = _list;

  while (elt != NULL) {

    if (elt->is_equal(k)) {

      return elt;

    }

    elt = elt->next();

  }

  elt = new (std::nothrow) KlassInfoEntry(k, list());

  // We may be out of space to allocate the new entry.

  if (elt != NULL) {

    set_list(elt);

  }

  return elt;

}

void KlassInfoBucket::iterate(KlassInfoClosure* cic) {

  KlassInfoEntry* elt = _list;

  while (elt != NULL) {

    cic->do_cinfo(elt);

    elt = elt->next();

  }

}

void KlassInfoBucket::empty() {

  KlassInfoEntry* elt = _list;

  _list = NULL;

  while (elt != NULL) {

    KlassInfoEntry* next = elt->next();

    delete elt;

    elt = next;

  }

}

void KlassInfoTable::AllClassesFinder::do_klass(Klass* k) {

  // This has the SIDE EFFECT of creating a KlassInfoEntry

  // for <k>, if one doesn't exist yet.

  _table->lookup(k);

}

KlassInfoTable::KlassInfoTable(bool add_all_classes) {

  _size_of_instances_in_words = 0;

  _size = 0;

  _ref = (HeapWord*) Universe::boolArrayKlassObj();

  _buckets =

    (KlassInfoBucket*)  AllocateHeap(sizeof(KlassInfoBucket) * _num_buckets,

       mtInternal, CURRENT_PC, AllocFailStrategy::RETURN_NULL);

  if (_buckets != NULL) {

    _size = _num_buckets;

    for (int index = 0; index < _size; index++) {

      _buckets[index].initialize();

    }

    if (add_all_classes) {

      AllClassesFinder finder(this);

      ClassLoaderDataGraph::classes_do(&finder);

    }

  }

}

KlassInfoTable::~KlassInfoTable() {

  if (_buckets != NULL) {

    for (int index = 0; index < _size; index++) {

      _buckets[index].empty();

    }

    FREE_C_HEAP_ARRAY(KlassInfoBucket, _buckets);

    _size = 0;

  }

}

uint KlassInfoTable::hash(const Klass* p) {

  return (uint)(((uintptr_t)p - (uintptr_t)_ref) >> 2);

}

KlassInfoEntry* KlassInfoTable::lookup(Klass* k) {

  uint         idx = hash(k) % _size;

  assert(_buckets != NULL, "Allocation failure should have been caught");

  KlassInfoEntry*  e   = _buckets[idx].lookup(k);

  // Lookup may fail if this is a new klass for which we

  // could not allocate space for an new entry.

  assert(e == NULL || k == e->klass(), "must be equal");

  return e;

}

// Return false if the entry could not be recorded on account

// of running out of space required to create a new entry.

bool KlassInfoTable::record_instance(const oop obj) {

  Klass*        k = obj->klass();

  KlassInfoEntry* elt = lookup(k);

  // elt may be NULL if it's a new klass for which we

  // could not allocate space for a new entry in the hashtable.

  if (elt != NULL) {

    elt->set_count(elt->count() + 1);

    elt->set_words(elt->words() + obj->size());

    _size_of_instances_in_words += obj->size();

    return true;

  } else {

    return false;

  }

}

void KlassInfoTable::iterate(KlassInfoClosure* cic) {

  assert(_size == 0 || _buckets != NULL, "Allocation failure should have been caught");

  for (int index = 0; index < _size; index++) {

    _buckets[index].iterate(cic);

  }

}

size_t KlassInfoTable::size_of_instances_in_words() const {

  return _size_of_instances_in_words;

}

int KlassInfoHisto::sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2) {

  return (*e1)->compare(*e1,*e2);

}

KlassInfoHisto::KlassInfoHisto(KlassInfoTable* cit) :

  _cit(cit) {

  _elements = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<KlassInfoEntry*>(_histo_initial_size, true);

}

KlassInfoHisto::~KlassInfoHisto() {

  delete _elements;

}

void KlassInfoHisto::add(KlassInfoEntry* cie) {

  elements()->append(cie);

}

void KlassInfoHisto::sort() {

  elements()->sort(KlassInfoHisto::sort_helper);

}

void KlassInfoHisto::print_elements(outputStream* st) const {

  // simplify the formatting (ILP32 vs LP64) - store the sum in 64-bit

  int64_t total = 0;

  uint64_t totalw = 0;

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

    st->print("%4d: ", i+1);

    elements()->at(i)->print_on(st);

    total += elements()->at(i)->count();

    totalw += elements()->at(i)->words();

  }

  st->print_cr("Total " INT64_FORMAT_W(13) "  " UINT64_FORMAT_W(13),

               total, totalw * HeapWordSize);

}

#define MAKE_COL_NAME(field, name, help)     #name,

#define MAKE_COL_HELP(field, name, help)     help,

static const char *name_table[] = {

  HEAP_INSPECTION_COLUMNS_DO(MAKE_COL_NAME)

};

static const char *help_table[] = {

  HEAP_INSPECTION_COLUMNS_DO(MAKE_COL_HELP)

};

bool KlassInfoHisto::is_selected(const char *col_name) {

  if (_selected_columns == NULL) {

    return true;

  }

  if (strcmp(_selected_columns, col_name) == 0) {

    return true;

  }

  const char *start = strstr(_selected_columns, col_name);

  if (start == NULL) {

    return false;

  }

  // The following must be true, because _selected_columns != col_name

  if (start > _selected_columns && start[-1] != ',') {

    return false;

  }

  char x = start[strlen(col_name)];

  if (x != ',' && x != '\0') {

    return false;

  }

  return true;

}

void KlassInfoHisto::print_title(outputStream* st, bool csv_format,

                                 bool selected[], int width_table[],

                                 const char *name_table[]) {

  if (csv_format) {

    st->print("Index,Super");

    for (int c=0; c<KlassSizeStats::_num_columns; c++) {

       if (selected[c]) {st->print(",%s", name_table[c]);}

    }

    st->print(",ClassName");

  } else {

    st->print("Index Super");

    for (int c = 0; c < KlassSizeStats::_num_columns; c++) {

      if (selected[c]) {

        st->print("%*s", width_table[c], name_table[c]);

      }

    }

    st->print(" ClassName");

  }

  if (is_selected("ClassLoader")) {

    st->print(",ClassLoader");

  }

  st->cr();

}

class HierarchyClosure : public KlassInfoClosure {

private:

  GrowableArray<KlassInfoEntry*> *_elements;

public:

  HierarchyClosure(GrowableArray<KlassInfoEntry*> *_elements) : _elements(_elements) {}

  void do_cinfo(KlassInfoEntry* cie) {

    // ignore array classes

    if (cie->klass()->is_instance_klass()) {

      _elements->append(cie);

    }

  }

};

void KlassHierarchy::print_class_hierarchy(outputStream* st, bool print_interfaces,

                                           bool print_subclasses, char* classname) {

  ResourceMark rm;

  Stack <KlassInfoEntry*, mtClass> class_stack;

  GrowableArray<KlassInfoEntry*> elements;

  // Add all classes to the KlassInfoTable, which allows for quick lookup.

  // A KlassInfoEntry will be created for each class.

  KlassInfoTable cit(true);

  if (cit.allocation_failed()) {

    st->print_cr("ERROR: Ran out of C-heap; hierarchy not generated");

    return;

  }

  // Add all created KlassInfoEntry instances to the elements array for easy

  // iteration, and to allow each KlassInfoEntry instance to have a unique index.

  HierarchyClosure hc(&elements);

  cit.iterate(&hc);

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

    KlassInfoEntry* cie = elements.at(i);

    Klass* super = cie->klass()->super();

    // Set the index for the class.

    cie->set_index(i + 1);

    // Add the class to the subclass array of its superclass.

    if (super != NULL) {

      KlassInfoEntry* super_cie = cit.lookup(super);

      assert(super_cie != NULL, "could not lookup superclass");

      super_cie->add_subclass(cie);

    }

  }

  // Set the do_print flag for each class that should be printed.

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

    KlassInfoEntry* cie = elements.at(i);

    if (classname == NULL) {

      // We are printing all classes.

      cie->set_do_print(true);

    } else {

      // We are only printing the hierarchy of a specific class.

      if (strcmp(classname, cie->klass()->external_name()) == 0) {

        KlassHierarchy::set_do_print_for_class_hierarchy(cie, &cit, print_subclasses);

      }

    }

  }

  // Now we do a depth first traversal of the class hierachry. The class_stack will

  // maintain the list of classes we still need to process. Start things off

  // by priming it with java.lang.Object.

  KlassInfoEntry* jlo_cie = cit.lookup(SystemDictionary::Object_klass());

  assert(jlo_cie != NULL, "could not lookup java.lang.Object");

  class_stack.push(jlo_cie);

  // Repeatedly pop the top item off the stack, print its class info,

  // and push all of its subclasses on to the stack. Do this until there

  // are no classes left on the stack.

  while (!class_stack.is_empty()) {

    KlassInfoEntry* curr_cie = class_stack.pop();

    if (curr_cie->do_print()) {

      print_class(st, curr_cie, print_interfaces);

      if (curr_cie->subclasses() != NULL) {

        // Current class has subclasses, so push all of them onto the stack.

        for (int i = 0; i < curr_cie->subclasses()->length(); i++) {

          KlassInfoEntry* cie = curr_cie->subclasses()->at(i);

          if (cie->do_print()) {

            class_stack.push(cie);

          }

        }

      }

    }

  }

  st->flush();

}

// Sets the do_print flag for every superclass and subclass of the specified class.

void KlassHierarchy::set_do_print_for_class_hierarchy(KlassInfoEntry* cie, KlassInfoTable* cit,

                                                      bool print_subclasses) {

  // Set do_print for all superclasses of this class.

  Klass* super = ((InstanceKlass*)cie->klass())->java_super();

  while (super != NULL) {

    KlassInfoEntry* super_cie = cit->lookup(super);

    super_cie->set_do_print(true);

    super = super->super();

  }

  // Set do_print for this class and all of its subclasses.

  Stack <KlassInfoEntry*, mtClass> class_stack;

  class_stack.push(cie);

  while (!class_stack.is_empty()) {

    KlassInfoEntry* curr_cie = class_stack.pop();

    curr_cie->set_do_print(true);

    if (print_subclasses && curr_cie->subclasses() != NULL) {

      // Current class has subclasses, so push all of them onto the stack.

      for (int i = 0; i < curr_cie->subclasses()->length(); i++) {

        KlassInfoEntry* cie = curr_cie->subclasses()->at(i);

        class_stack.push(cie);

      }

    }

  }

}

static void print_indent(outputStream* st, int indent) {

  while (indent != 0) {

    st->print("|");

    indent--;

    if (indent != 0) {

      st->print("  ");

    }

  }

}

// Print the class name and its unique ClassLoader identifer.

static void print_classname(outputStream* st, Klass* klass) {

  oop loader_oop = klass->class_loader_data()->class_loader();

  st->print("%s/", klass->external_name());

  if (loader_oop == NULL) {

    st->print("null");

  } else {

    st->print(INTPTR_FORMAT, p2i(klass->class_loader_data()));

  }

}

static void print_interface(outputStream* st, Klass* intf_klass, const char* intf_type, int indent) {

  print_indent(st, indent);

  st->print("  implements ");

  print_classname(st, intf_klass);

  st->print(" (%s intf)\n", intf_type);

}

void KlassHierarchy::print_class(outputStream* st, KlassInfoEntry* cie, bool print_interfaces) {

  ResourceMark rm;

  InstanceKlass* klass = (InstanceKlass*)cie->klass();

  int indent = 0;

  // Print indentation with proper indicators of superclass.

  Klass* super = klass->super();

  while (super != NULL) {

    super = super->super();

    indent++;

  }

  print_indent(st, indent);

  if (indent != 0) st->print("--");

  // Print the class name, its unique ClassLoader identifer, and if it is an interface.

  print_classname(st, klass);

  if (klass->is_interface()) {

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

  }