/*

 * Copyright (c) 2002, 2013, 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.

 *

 */

#ifndef SHARE_VM_MEMORY_HEAPINSPECTION_HPP

#define SHARE_VM_MEMORY_HEAPINSPECTION_HPP

#include "memory/allocation.inline.hpp"

#include "oops/oop.inline.hpp"

#include "oops/annotations.hpp"

#include "utilities/macros.hpp"

#if INCLUDE_SERVICES

// HeapInspection

// KlassInfoTable is a bucket hash table that

// maps Klass*s to extra information:

//    instance count and instance word size.

//

// A KlassInfoBucket is the head of a link list

// of KlassInfoEntry's

//

// KlassInfoHisto is a growable array of pointers

// to KlassInfoEntry's and is used to sort

// the entries.

#define HEAP_INSPECTION_COLUMNS_DO(f) \

    f(inst_size, InstSize, \

        "Size of each object instance of the Java class") \

    f(inst_count, InstCount, \

        "Number of object instances of the Java class")  \

    f(inst_bytes, InstBytes, \

        "This is usually (InstSize * InstNum). The only exception is " \

        "java.lang.Class, whose InstBytes also includes the slots " \

        "used to store static fields. InstBytes is not counted in " \

        "ROAll, RWAll or Total") \

    f(mirror_bytes, Mirror, \

        "Size of the Klass::java_mirror() object") \

    f(klass_bytes, KlassBytes, \

        "Size of the InstanceKlass or ArrayKlass for this class. " \

        "Note that this includes VTab, ITab, OopMap") \

    f(secondary_supers_bytes, K_secondary_supers, \

        "Number of bytes used by the Klass::secondary_supers() array") \

    f(vtab_bytes, VTab, \

        "Size of the embedded vtable in InstanceKlass") \

    f(itab_bytes, ITab, \

        "Size of the embedded itable in InstanceKlass") \

    f(nonstatic_oopmap_bytes, OopMap, \

        "Size of the embedded nonstatic_oop_map in InstanceKlass") \

    f(methods_array_bytes, IK_methods, \

        "Number of bytes used by the InstanceKlass::methods() array") \

    f(method_ordering_bytes, IK_method_ordering, \

        "Number of bytes used by the InstanceKlass::method_ordering() array") \

    f(local_interfaces_bytes, IK_local_interfaces, \

        "Number of bytes used by the InstanceKlass::local_interfaces() array") \

    f(transitive_interfaces_bytes, IK_transitive_interfaces, \

        "Number of bytes used by the InstanceKlass::transitive_interfaces() array") \

    f(fields_bytes, IK_fields, \

        "Number of bytes used by the InstanceKlass::fields() array") \

    f(inner_classes_bytes, IK_inner_classes, \

        "Number of bytes used by the InstanceKlass::inner_classes() array") \

    f(signers_bytes, IK_signers, \

        "Number of bytes used by the InstanceKlass::singers() array") \

    f(class_annotations_bytes, class_annotations, \

        "Size of class annotations") \

    f(class_type_annotations_bytes, class_type_annotations, \

        "Size of class type annotations") \

    f(fields_annotations_bytes, fields_annotations, \

        "Size of field annotations") \

    f(fields_type_annotations_bytes, fields_type_annotations, \

        "Size of field type annotations") \

    f(methods_annotations_bytes, methods_annotations, \

        "Size of method annotations") \

    f(methods_parameter_annotations_bytes, methods_parameter_annotations, \

        "Size of method parameter annotations") \

    f(methods_type_annotations_bytes, methods_type_annotations, \

        "Size of methods type annotations") \

    f(methods_default_annotations_bytes, methods_default_annotations, \

        "Size of methods default annotations") \

    f(annotations_bytes, annotations, \

        "Size of all annotations") \

    f(cp_bytes, Cp, \

        "Size of InstanceKlass::constants()") \

    f(cp_tags_bytes, CpTags, \

        "Size of InstanceKlass::constants()->tags()") \

    f(cp_cache_bytes, CpCache, \

        "Size of InstanceKlass::constants()->cache()") \

    f(cp_operands_bytes, CpOperands, \

        "Size of InstanceKlass::constants()->operands()") \

    f(cp_refmap_bytes, CpRefMap, \

        "Size of InstanceKlass::constants()->reference_map()") \

    f(cp_all_bytes, CpAll, \

        "Sum of Cp + CpTags + CpCache + CpOperands + CpRefMap") \

    f(method_count, MethodCount, \

        "Number of methods in this class") \

    f(method_bytes, MethodBytes, \

        "Size of the Method object") \

    f(const_method_bytes, ConstMethod, \

        "Size of the ConstMethod object") \

    f(method_data_bytes, MethodData, \

        "Size of the MethodData object") \

    f(stackmap_bytes, StackMap, \

        "Size of the stackmap_data") \

    f(bytecode_bytes, Bytecodes, \

        "Of the MethodBytes column, how much are the space taken up by bytecodes") \

    f(method_all_bytes, MethodAll, \

        "Sum of MethodBytes + Constmethod + Stackmap + Methoddata") \

    f(ro_bytes, ROAll, \

        "Size of all class meta data that could (potentially) be placed " \

        "in read-only memory. (This could change with CDS design)") \

    f(rw_bytes, RWAll, \

        "Size of all class meta data that must be placed in read/write " \

        "memory. (This could change with CDS design) ") \

    f(total_bytes, Total, \

        "ROAll + RWAll. Note that this does NOT include InstBytes.")

// Size statistics for a Klass - filled in by Klass::collect_statistics()

class KlassSizeStats {

public:

#define COUNT_KLASS_SIZE_STATS_FIELD(field, name, help)   _index_ ## field,

#define DECLARE_KLASS_SIZE_STATS_FIELD(field, name, help) julong _ ## field;

  enum {

    HEAP_INSPECTION_COLUMNS_DO(COUNT_KLASS_SIZE_STATS_FIELD)

    _num_columns

  };

  HEAP_INSPECTION_COLUMNS_DO(DECLARE_KLASS_SIZE_STATS_FIELD)

  static int count(oop x) {

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

  }

  static int count_array(objArrayOop x) {

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

  }

  template <class T> static int count(T* x) {

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

  }

  template <class T> static int count_array(T* x) {

    if (x == NULL) {

      return 0;

    }

    if (x->length() == 0) {

      // This is a shared array, e.g., Universe::the_empty_int_array(). Don't

      // count it to avoid double-counting.

      return 0;

    }

    return HeapWordSize * x->size();

  }

};

class KlassInfoEntry: public CHeapObj<mtInternal> {

 private:

  KlassInfoEntry* _next;

  Klass*          _klass;

  long            _instance_count;

  size_t          _instance_words;

  long            _index;

 public:

  KlassInfoEntry(Klass* k, KlassInfoEntry* next) :

    _klass(k), _instance_count(0), _instance_words(0), _next(next), _index(-1)

  {}

  KlassInfoEntry* next() const   { return _next; }

  bool is_equal(const Klass* k)  { return k == _klass; }

  Klass* klass()  const      { return _klass; }

  long count()    const      { return _instance_count; }

  void set_count(long ct)    { _instance_count = ct; }

  size_t words()  const      { return _instance_words; }

  void set_words(size_t wds) { _instance_words = wds; }

  void set_index(long index) { _index = index; }

  long index()    const      { return _index; }

  int compare(KlassInfoEntry* e1, KlassInfoEntry* e2);

  void print_on(outputStream* st) const;

  const char* name() const;

};

class KlassInfoClosure : public StackObj {

 public:

  // Called for each KlassInfoEntry.

  virtual void do_cinfo(KlassInfoEntry* cie) = 0;

};

class KlassInfoBucket: public CHeapObj<mtInternal> {

 private:

  KlassInfoEntry* _list;

  KlassInfoEntry* list()           { return _list; }

  void set_list(KlassInfoEntry* l) { _list = l; }

 public:

  KlassInfoEntry* lookup(Klass* k);

  void initialize() { _list = NULL; }

  void empty();

  void iterate(KlassInfoClosure* cic);

};

class KlassInfoTable: public StackObj {

 private:

  int _size;

  static const int _num_buckets = 20011;

  size_t _size_of_instances_in_words;

  // An aligned reference address (typically the least

  // address in the perm gen) used for hashing klass

  // objects.

  HeapWord* _ref;

  KlassInfoBucket* _buckets;

  uint hash(const Klass* p);

  KlassInfoEntry* lookup(Klass* k); // allocates if not found!

  class AllClassesFinder : public KlassClosure {

    KlassInfoTable *_table;

   public:

    AllClassesFinder(KlassInfoTable* table) : _table(table) {}

    virtual void do_klass(Klass* k);

  };

 public:

  KlassInfoTable(bool need_class_stats);

  ~KlassInfoTable();

  bool record_instance(const oop obj);

  void iterate(KlassInfoClosure* cic);

  bool allocation_failed() { return _buckets == NULL; }

  size_t size_of_instances_in_words() const;

  friend class KlassInfoHisto;

};

class KlassInfoHisto : public StackObj {

 private:

  static const int _histo_initial_size = 1000;

  KlassInfoTable *_cit;

  GrowableArray<KlassInfoEntry*>* _elements;

  GrowableArray<KlassInfoEntry*>* elements() const { return _elements; }

  const char* _title;

  const char* title() const { return _title; }

  static int sort_helper(KlassInfoEntry** e1, KlassInfoEntry** e2);

  void print_elements(outputStream* st) const;

  void print_class_stats(outputStream* st, bool csv_format, const char *columns);

  julong annotations_bytes(Array<AnnotationArray*>* p) const;

  const char *_selected_columns;

  bool is_selected(const char *col_name);

  void print_title(outputStream* st, bool csv_format,

                   bool selected_columns_table[], int width_table[],

                   const char *name_table[]);

  template <class T> static int count_bytes(T* x) {

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

  }

  template <class T> static int count_bytes_array(T* x) {

    if (x == NULL) {

      return 0;

    }

    if (x->length() == 0) {

      // This is a shared array, e.g., Universe::the_empty_int_array(). Don't

      // count it to avoid double-counting.

      return 0;

    }

    return HeapWordSize * x->size();

  }

  // returns a format string to print a julong with the given width. E.g,

  // printf(num_fmt(6), julong(10)) would print out the number 10 with 4

  // leading spaces.

  static void print_julong(outputStream* st, int width, julong n) {

    int num_spaces = width - julong_width(n);

    if (num_spaces > 0) {

      st->print(str_fmt(num_spaces), "");

    }

    st->print(JULONG_FORMAT, n);

  }

  static char* perc_fmt(int width) {

    static char buf[32];

    jio_snprintf(buf, sizeof(buf), "%%%d.1f%%%%", width-1);

    return buf;

  }

  static char* str_fmt(int width) {

    static char buf[32];

    jio_snprintf(buf, sizeof(buf), "%%%ds", width);

    return buf;

  }

  static int julong_width(julong n) {

    if (n == 0) {

      return 1;

    }

    int w = 0;

    while (n > 0) {

      n /= 10;

      w += 1;

    }

    return w;

  }

  static int col_width(julong n, const char *name) {

    int w = julong_width(n);

    int min = (int)(strlen(name));

    if (w < min) {

        w = min;

    }

    // add a leading space for separation.

    return w + 1;

  }

 public:

  KlassInfoHisto(KlassInfoTable* cit, const char* title);

  ~KlassInfoHisto();

  void add(KlassInfoEntry* cie);

  void print_histo_on(outputStream* st, bool print_class_stats, bool csv_format, const char *columns);

  void sort();

};

#endif // INCLUDE_SERVICES

// These declarations are needed since teh declaration of KlassInfoTable and

// KlassInfoClosure are guarded by #if INLCUDE_SERVICES

class KlassInfoTable;

class KlassInfoClosure;

class HeapInspection : public StackObj {

  bool _csv_format; // "comma separated values" format for spreadsheet.

  bool _print_help;

  bool _print_class_stats;

  const char* _columns;

 public:

  HeapInspection(bool csv_format, bool print_help,

                 bool print_class_stats, const char *columns) :

      _csv_format(csv_format), _print_help(print_help),

      _print_class_stats(print_class_stats), _columns(columns) {}

  void heap_inspection(outputStream* st) NOT_SERVICES_RETURN;

  size_t populate_table(KlassInfoTable* cit, BoolObjectClosure* filter = NULL) NOT_SERVICES_RETURN;

  static void find_instances_at_safepoint(Klass* k, GrowableArray<oop>* result) NOT_SERVICES_RETURN;

 private:

  void iterate_over_heap(KlassInfoTable* cit, BoolObjectClosure* filter = NULL);

};

#endif // SHARE_VM_MEMORY_HEAPINSPECTION_HPP