1 /*
2 * Copyright (c) 2001, 2006, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 package sun.jvm.hotspot.utilities;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.gc_interface.*;
31 import sun.jvm.hotspot.memory.*;
32 import sun.jvm.hotspot.oops.*;
33 import sun.jvm.hotspot.runtime.*;
34
35 /** Finds all paths from roots to the specified set of objects. NOTE:
36 currently only a subset of the roots known to the VM is exposed to
37 the SA: objects on the stack, static fields in classes, and JNI
38 handles. These should be most of the user-level roots keeping
39 objects alive. */
40
41 public class LivenessAnalysis {
42 // Used for debugging this code
43 private static final boolean DEBUG = false;
44
45 private LivenessAnalysis() {}
46
47 public static LivenessPathList computeAllLivenessPaths(Oop target) {
48 LivenessPathList list = computeAllLivenessPaths(target, true);
49 if ((list == null) || (list.size() == 0)) {
50 // Dead object
|
1 /*
2 * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 package sun.jvm.hotspot.utilities;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.gc.shared.*;
31 import sun.jvm.hotspot.memory.*;
32 import sun.jvm.hotspot.oops.*;
33 import sun.jvm.hotspot.runtime.*;
34
35 /** Finds all paths from roots to the specified set of objects. NOTE:
36 currently only a subset of the roots known to the VM is exposed to
37 the SA: objects on the stack, static fields in classes, and JNI
38 handles. These should be most of the user-level roots keeping
39 objects alive. */
40
41 public class LivenessAnalysis {
42 // Used for debugging this code
43 private static final boolean DEBUG = false;
44
45 private LivenessAnalysis() {}
46
47 public static LivenessPathList computeAllLivenessPaths(Oop target) {
48 LivenessPathList list = computeAllLivenessPaths(target, true);
49 if ((list == null) || (list.size() == 0)) {
50 // Dead object
|