--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/utilities/histogram.cpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,100 @@
+/*
+ * Copyright 1998-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+# include "incls/_precompiled.incl"
+# include "incls/_histogram.cpp.incl"
+
+#ifdef ASSERT
+
+////////////////// HistogramElement ////////////////////////
+
+HistogramElement::HistogramElement() {
+  _count = 0;
+}
+
+int HistogramElement::count() {
+  return _count;
+}
+
+const char* HistogramElement::name() {
+  return _name;
+}
+
+void HistogramElement::increment_count() {
+  // We can't use the accessor :-(.
+  Atomic::inc(&_count);
+}
+
+int HistogramElement::compare(HistogramElement* e1,HistogramElement* e2) {
+  if(e1->count() > e2->count()) {
+    return -1;
+  } else if(e1->count() < e2->count()) {
+    return 1;
+  }
+  return 0;
+}
+
+void HistogramElement::print_on(outputStream* st) const {
+  st->print("%10d   ",((HistogramElement*)this)->count());
+  st->print_cr("%s",((HistogramElement*)this)->name());
+}
+
+////////////////// Histogram ////////////////////////
+
+int Histogram::sort_helper(HistogramElement** e1, HistogramElement** e2) {
+  return (*e1)->compare(*e1,*e2);
+}
+
+Histogram::Histogram(const char* title,int estimatedCount) {
+  _title = title;
+  _elements = new (ResourceObj::C_HEAP) GrowableArray<HistogramElement*>(estimatedCount,true);
+}
+
+void Histogram::add_element(HistogramElement* element) {
+  // Note, we need to add locking !
+  elements()->append(element);
+}
+
+void Histogram::print_header(outputStream* st) {
+  st->print_cr("%s",title());
+  st->print_cr("--------------------------------------------------");
+}
+
+void Histogram::print_elements(outputStream* st) {
+  elements()->sort(Histogram::sort_helper);
+  jint total = 0;
+  for(int i=0; i < elements()->length(); i++) {
+    elements()->at(i)->print();
+    total += elements()->at(i)->count();
+  }
+  st->print("%10d   ", total);
+  st->print_cr("Total");
+}
+
+void Histogram::print_on(outputStream* st) const {
+  ((Histogram*)this)->print_header(st);
+  ((Histogram*)this)->print_elements(st);
+}
+
+#endif