01: /*
02: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
03: *
04: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
05: *
06: * The contents of this file are subject to the terms of either the GNU
07: * General Public License Version 2 only ("GPL") or the Common
08: * Development and Distribution License("CDDL") (collectively, the
09: * "License"). You may not use this file except in compliance with the
10: * License. You can obtain a copy of the License at
11: * http://www.netbeans.org/cddl-gplv2.html
12: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
13: * specific language governing permissions and limitations under the
14: * License. When distributing the software, include this License Header
15: * Notice in each file and include the License file at
16: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
17: * particular file as subject to the "Classpath" exception as provided
18: * by Sun in the GPL Version 2 section of the License file that
19: * accompanied this code. If applicable, add the following below the
20: * License Header, with the fields enclosed by brackets [] replaced by
21: * your own identifying information:
22: * "Portions Copyrighted [year] [name of copyright owner]"
23: *
24: * Contributor(s):
25: * The Original Software is NetBeans. The Initial Developer of the Original
26: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
27: * Microsystems, Inc. All Rights Reserved.
28: *
29: * If you wish your version of this file to be governed by only the CDDL
30: * or only the GPL Version 2, indicate your decision by adding
31: * "[Contributor] elects to include this software in this distribution
32: * under the [CDDL or GPL Version 2] license." If you do not indicate a
33: * single choice of license, a recipient has the option to distribute
34: * your version of this file under either the CDDL, the GPL Version 2 or
35: * to extend the choice of license to its licensees as provided above.
36: * However, if you add GPL Version 2 code and therefore, elected the GPL
37: * Version 2 license, then the option applies only if the new code is
38: * made subject to such option by the copyright holder.
39: */
40:
41: package org.netbeans.lib.profiler.server.system;
42:
43: /**
44: * Provides methods for accessing thread stacks contents.
45: *
46: * @author Misha Dmitriev
47: */
48: public class Stacks {
49: //~ Methods ------------------------------------------------------------------------------------------------------------------
50:
51: /** Returns the number of Java frames on the stack of the current thread */
52: public static native int getCurrentJavaStackDepth(Thread thread);
53:
54: /**
55: * stackDepth parameter is the maximum number of stack frames that can be sampled. Returns the actual number of
56: * stack frames sampled.
57: */
58: public static native int getCurrentStackFrameIds(Thread thread,
59: int stackDepth, int[] stackFrameIds);
60:
61: /**
62: * For the given array of jmethodIds, returns the names of the respective methods as
63: * (class name, method name and method signature) triplets.
64: * All this symbolic information is returned as a single packed array of bytes (with each string in UTF8 format).
65: * packedArrayOffsets is filled out with offsets of all of these strings.
66: *
67: * @param nMethods The number of methods, length of the methodIds array
68: * @param methodIds An array of jMethodIds for which we need their names
69: * @param packedArrayOffsets An array that, upon return from this method, will contain the indexes into the returned
70: * array
71: * @return A packed array of bytes of triplets [class name, method name, method signature], packedArrayOffsets
72: * contains indexes into this array for individual items
73: */
74: public static native byte[] getMethodNamesForJMethodIds(
75: int nMethods, int[] methodIds, int[] packedArrayOffsets);
76:
77: /** Clear the above stack frame buffer permanently. */
78: public static native void clearNativeStackFrameBuffer();
79:
80: /**
81: * Creates the internal, C-level stack frame buffer, used for intermediate storage of data obtained using
82: * getCurrentStackFrameIds. Since just a single buffer is used, getCurrentStackFrameIds is obviously not
83: * multithread-safe. The code that uses this stuff has to use a single lock - so far not a problem for memory
84: * profiling where we use it, since normally it collects data for just every 10th object, thus the probability
85: * of contention is not very high.
86: */
87: public static native void createNativeStackFrameBuffer(
88: int sizeInFrames);
89:
90: /** Should be called at earliest possible time */
91: public static void initialize() {
92: // Doesn't do anything in this version
93: }
94: }
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