| /* |
| * Copyright (c) 1998, 2014, 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_UTILITIES_HISTOGRAM_HPP |
| #define SHARE_VM_UTILITIES_HISTOGRAM_HPP |
| |
| #include "memory/allocation.hpp" |
| #include "runtime/os.hpp" |
| #include "utilities/growableArray.hpp" |
| |
| // This class provides a framework for collecting various statistics. |
| // The current implementation is oriented towards counting invocations |
| // of various types, but that can be easily changed. |
| // |
| // To use it, you need to declare a Histogram*, and a subtype of |
| // HistogramElement: |
| // |
| // HistogramElement* MyHistogram; |
| // |
| // class MyHistogramElement : public HistogramElement { |
| // public: |
| // MyHistogramElement(char* name); |
| // }; |
| // |
| // MyHistogramElement::MyHistogramElement(char* elementName) { |
| // _name = elementName; |
| // |
| // if(MyHistogram == NULL) |
| // MyHistogram = new Histogram("My Call Counts",100); |
| // |
| // MyHistogram->add_element(this); |
| // } |
| // |
| // #define MyCountWrapper(arg) static MyHistogramElement* e = new MyHistogramElement(arg); e->increment_count() |
| // |
| // This gives you a simple way to count invocations of specfic functions: |
| // |
| // void a_function_that_is_being_counted() { |
| // MyCountWrapper("FunctionName"); |
| // ... |
| // } |
| // |
| // To print the results, invoke print() on your Histogram*. |
| |
| #ifdef ASSERT |
| |
| class HistogramElement : public CHeapObj<mtInternal> { |
| protected: |
| jint _count; |
| const char* _name; |
| |
| public: |
| HistogramElement(); |
| virtual int count(); |
| virtual const char* name(); |
| virtual void increment_count(); |
| void print_on(outputStream* st) const; |
| virtual int compare(HistogramElement* e1,HistogramElement* e2); |
| }; |
| |
| class Histogram : public CHeapObj<mtInternal> { |
| protected: |
| GrowableArray<HistogramElement*>* _elements; |
| GrowableArray<HistogramElement*>* elements() { return _elements; } |
| const char* _title; |
| const char* title() { return _title; } |
| static int sort_helper(HistogramElement** e1,HistogramElement** e2); |
| virtual void print_header(outputStream* st); |
| virtual void print_elements(outputStream* st); |
| |
| public: |
| Histogram(const char* title,int estimatedSize); |
| virtual void add_element(HistogramElement* element); |
| void print_on(outputStream* st) const; |
| }; |
| |
| #endif |
| |
| #endif // SHARE_VM_UTILITIES_HISTOGRAM_HPP |