--- /dev/null	2019-01-28 17:46:04.000000000 +0800
+++ new/src/share/vm/jfr/leakprofiler/checkpoint/objectSampleDescription.cpp	2019-01-28 17:46:03.000000000 +0800
@@ -0,0 +1,220 @@
+/*
+ * Copyright (c) 2017, 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/javaClasses.hpp"
+#include "classfile/symbolTable.hpp"
+#include "classfile/systemDictionary.hpp"
+#include "jfr/leakprofiler/checkpoint/objectSampleDescription.hpp"
+#include "jfr/recorder/checkpoint/jfrCheckpointWriter.hpp"
+#include "oops/oop.inline.hpp"
+#include "runtime/thread.hpp"
+#include "utilities/ostream.hpp"
+
+static Symbol* symbol_size = NULL;
+
+ObjectDescriptionBuilder::ObjectDescriptionBuilder() {
+  reset();
+}
+
+void ObjectDescriptionBuilder::write_int(jint value) {
+  char buf[20];
+  jio_snprintf(buf, sizeof(buf), "%d", value);
+  write_text(buf);
+}
+
+void ObjectDescriptionBuilder::write_text(const char* text) {
+  if (_index == sizeof(_buffer) - 2) {
+    return;
+  }
+  while (*text != '\0' && _index < sizeof(_buffer) - 2) {
+    _buffer[_index] = *text;
+    _index++;
+    text++;
+  }
+  assert(_index < sizeof(_buffer) - 1, "index should not exceed buffer size");
+  // add ellipsis if we reached end
+  if (_index == sizeof(_buffer) - 2) {
+    _buffer[_index-3] = '.';
+    _buffer[_index-2] = '.';
+    _buffer[_index-1] = '.';
+  }
+  // terminate string
+  _buffer[_index] = '\0';
+}
+
+void ObjectDescriptionBuilder::reset() {
+  _index = 0;
+  _buffer[0] = '\0';
+}
+
+void ObjectDescriptionBuilder::print_description(outputStream* out) {
+  out->print("%s", (const char*)_buffer);
+}
+
+const char* ObjectDescriptionBuilder::description() {
+  if (_buffer[0] == '\0') {
+    return NULL;
+  }
+  const size_t len = strlen(_buffer);
+  char* copy = NEW_RESOURCE_ARRAY(char, len + 1);
+  assert(copy != NULL, "invariant");
+  strncpy(copy, _buffer, len + 1);
+  return copy;
+}
+
+ObjectSampleDescription::ObjectSampleDescription(oop object) :
+  _object(object) {
+}
+
+void ObjectSampleDescription::ensure_initialized() {
+  if (symbol_size == NULL) {
+    symbol_size = SymbolTable::new_permanent_symbol("size", Thread::current());
+  }
+}
+
+void ObjectSampleDescription::print_description(outputStream* out) {
+  write_object_to_buffer();
+  _description.print_description(out);
+}
+
+const char* ObjectSampleDescription::description() {
+  write_object_to_buffer();
+  return _description.description();
+}
+
+void ObjectSampleDescription::write_text(const char* text) {
+  _description.write_text(text);
+}
+
+void ObjectSampleDescription::write_int(jint value) {
+  _description.write_int(value);
+}
+
+void ObjectSampleDescription::write_object_to_buffer() {
+  ensure_initialized();
+  _description.reset();
+  write_object_details();
+}
+
+void ObjectSampleDescription::write_object_details() {
+  Klass* klass = _object->klass();
+  Symbol* class_name = klass->name();
+  jint size;
+
+  if (_object->is_a(SystemDictionary::Class_klass())) {
+    write_class_name();
+    return;
+  }
+
+  if (_object->is_a(SystemDictionary::Thread_klass())) {
+    write_thread_name();
+    return;
+  }
+
+  if (_object->is_a(SystemDictionary::ThreadGroup_klass())) {
+    write_thread_group_name();
+    return;
+  }
+
+  if (read_int_size(&size)) {
+    write_size(size);
+    return;
+  }
+}
+
+void ObjectSampleDescription::write_class_name() {
+  assert(_object->is_a(SystemDictionary::Class_klass()), "invariant");
+  const Klass* const k = java_lang_Class::as_Klass(_object);
+  if (k == NULL) {
+    // might represent a primitive
+    const Klass* const ak = java_lang_Class::array_klass(_object);
+    // If ak is NULL, this is most likely a mirror associated with a
+    // jvmti redefine/retransform scratch klass. We can't get any additional
+    // information from it.
+    if (ak != NULL) {
+      write_text(type2name(java_lang_Class::primitive_type(_object)));
+    }
+    return;
+  }
+
+  if (k->oop_is_instance()) {
+    const InstanceKlass* ik = InstanceKlass::cast((Klass*)k);
+    if (ik->is_anonymous()) {
+      return;
+    }
+    assert(!ik->is_anonymous(), "invariant");
+    const Symbol* name = ik->name();
+    if (name != NULL) {
+      write_text("Class Name: ");
+      write_text(name->as_klass_external_name());
+    }
+  }
+}
+
+void ObjectSampleDescription::write_thread_group_name() {
+  assert(_object->is_a(SystemDictionary::ThreadGroup_klass()), "invariant");
+  const char* tg_name = NULL;
+  typeArrayOop name = java_lang_ThreadGroup::name(_object);
+  if (name != NULL) {
+    tg_name = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
+  }
+  if (tg_name != NULL) {
+    write_text("Thread Group: ");
+    write_text(tg_name);
+  }
+}
+
+void ObjectSampleDescription::write_thread_name() {
+  assert(_object->is_a(SystemDictionary::Thread_klass()), "invariant");
+  oop name = java_lang_Thread::name(_object);
+  if (name != NULL) {
+    char* p = java_lang_String::as_utf8_string(name);
+    if (p != NULL) {
+      write_text("Thread Name: ");
+      write_text(p);
+    }
+  }
+}
+
+void ObjectSampleDescription::write_size(jint size) {
+  if (size >= 0) {
+    write_text("Size: ");
+    write_int(size);
+  }
+}
+
+bool ObjectSampleDescription::read_int_size(jint* result_size) {
+  fieldDescriptor fd;
+  Klass* klass = _object->klass();
+  if (klass->oop_is_instance()) {
+    InstanceKlass* ik = InstanceKlass::cast(klass);
+    if (ik->find_field(symbol_size, vmSymbols::int_signature(), false, &fd) != NULL) {
+       jint size = _object->int_field(fd.offset());
+       *result_size = size;
+       return true;
+    }
+  }
+  return false;
+}