1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/utilities/histogram.hpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,91 @@
1.4 +/*
1.5 + * Copyright 1998-2000 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// This class provides a framework for collecting various statistics.
1.29 +// The current implementation is oriented towards counting invocations
1.30 +// of various types, but that can be easily changed.
1.31 +//
1.32 +// To use it, you need to declare a Histogram*, and a subtype of
1.33 +// HistogramElement:
1.34 +//
1.35 +// HistogramElement* MyHistogram;
1.36 +//
1.37 +// class MyHistogramElement : public HistogramElement {
1.38 +// public:
1.39 +// MyHistogramElement(char* name);
1.40 +// };
1.41 +//
1.42 +// MyHistogramElement::MyHistogramElement(char* elementName) {
1.43 +// _name = elementName;
1.44 +//
1.45 +// if(MyHistogram == NULL)
1.46 +// MyHistogram = new Histogram("My Call Counts",100);
1.47 +//
1.48 +// MyHistogram->add_element(this);
1.49 +// }
1.50 +//
1.51 +// #define MyCountWrapper(arg) static MyHistogramElement* e = new MyHistogramElement(arg); e->increment_count()
1.52 +//
1.53 +// This gives you a simple way to count invocations of specfic functions:
1.54 +//
1.55 +// void a_function_that_is_being_counted() {
1.56 +// MyCountWrapper("FunctionName");
1.57 +// ...
1.58 +// }
1.59 +//
1.60 +// To print the results, invoke print() on your Histogram*.
1.61 +
1.62 +#ifdef ASSERT
1.63 +
1.64 +class HistogramElement : public CHeapObj {
1.65 + protected:
1.66 + jint _count;
1.67 + const char* _name;
1.68 +
1.69 + public:
1.70 + HistogramElement();
1.71 + virtual int count();
1.72 + virtual const char* name();
1.73 + virtual void increment_count();
1.74 + void print_on(outputStream* st) const;
1.75 + virtual int compare(HistogramElement* e1,HistogramElement* e2);
1.76 +};
1.77 +
1.78 +class Histogram : public CHeapObj {
1.79 + protected:
1.80 + GrowableArray<HistogramElement*>* _elements;
1.81 + GrowableArray<HistogramElement*>* elements() { return _elements; }
1.82 + const char* _title;
1.83 + const char* title() { return _title; }
1.84 + static int sort_helper(HistogramElement** e1,HistogramElement** e2);
1.85 + virtual void print_header(outputStream* st);
1.86 + virtual void print_elements(outputStream* st);
1.87 +
1.88 + public:
1.89 + Histogram(const char* title,int estimatedSize);
1.90 + virtual void add_element(HistogramElement* element);
1.91 + void print_on(outputStream* st) const;
1.92 +};
1.93 +
1.94 +#endif
