Mercurial > hg > truffle
annotate src/share/vm/utilities/histogram.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
| author | johnc |
|---|---|
| date | Wed, 18 Aug 2010 10:59:06 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 1998, 2000, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 // This class provides a framework for collecting various statistics. | |
| 26 // The current implementation is oriented towards counting invocations | |
| 27 // of various types, but that can be easily changed. | |
| 28 // | |
| 29 // To use it, you need to declare a Histogram*, and a subtype of | |
| 30 // HistogramElement: | |
| 31 // | |
| 32 // HistogramElement* MyHistogram; | |
| 33 // | |
| 34 // class MyHistogramElement : public HistogramElement { | |
| 35 // public: | |
| 36 // MyHistogramElement(char* name); | |
| 37 // }; | |
| 38 // | |
| 39 // MyHistogramElement::MyHistogramElement(char* elementName) { | |
| 40 // _name = elementName; | |
| 41 // | |
| 42 // if(MyHistogram == NULL) | |
| 43 // MyHistogram = new Histogram("My Call Counts",100); | |
| 44 // | |
| 45 // MyHistogram->add_element(this); | |
| 46 // } | |
| 47 // | |
| 48 // #define MyCountWrapper(arg) static MyHistogramElement* e = new MyHistogramElement(arg); e->increment_count() | |
| 49 // | |
| 50 // This gives you a simple way to count invocations of specfic functions: | |
| 51 // | |
| 52 // void a_function_that_is_being_counted() { | |
| 53 // MyCountWrapper("FunctionName"); | |
| 54 // ... | |
| 55 // } | |
| 56 // | |
| 57 // To print the results, invoke print() on your Histogram*. | |
| 58 | |
| 59 #ifdef ASSERT | |
| 60 | |
| 61 class HistogramElement : public CHeapObj { | |
| 62 protected: | |
| 63 jint _count; | |
| 64 const char* _name; | |
| 65 | |
| 66 public: | |
| 67 HistogramElement(); | |
| 68 virtual int count(); | |
| 69 virtual const char* name(); | |
| 70 virtual void increment_count(); | |
| 71 void print_on(outputStream* st) const; | |
| 72 virtual int compare(HistogramElement* e1,HistogramElement* e2); | |
| 73 }; | |
| 74 | |
| 75 class Histogram : public CHeapObj { | |
| 76 protected: | |
| 77 GrowableArray<HistogramElement*>* _elements; | |
| 78 GrowableArray<HistogramElement*>* elements() { return _elements; } | |
| 79 const char* _title; | |
| 80 const char* title() { return _title; } | |
| 81 static int sort_helper(HistogramElement** e1,HistogramElement** e2); | |
| 82 virtual void print_header(outputStream* st); | |
| 83 virtual void print_elements(outputStream* st); | |
| 84 | |
| 85 public: | |
| 86 Histogram(const char* title,int estimatedSize); | |
| 87 virtual void add_element(HistogramElement* element); | |
| 88 void print_on(outputStream* st) const; | |
| 89 }; | |
| 90 | |
| 91 #endif |