1 /*
2 * Copyright (c) 2012, 2014, 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.hotspot;
26
27 import java.lang.reflect.Executable;
28 import java.security.BasicPermission;
29 import sun.hotspot.parser.DiagnosticCommand;
30
31 public class WhiteBox {
32
33 @SuppressWarnings("serial")
34 public static class WhiteBoxPermission extends BasicPermission {
35 public WhiteBoxPermission(String s) {
36 super(s);
37 }
38 }
39
40 private WhiteBox() {}
41 private static final WhiteBox instance = new WhiteBox();
42 private static native void registerNatives();
43
44 /**
45 * Returns the singleton WhiteBox instance.
46 *
47 * The returned WhiteBox object should be carefully guarded
48 * by the caller, since it can be used to read and write data
49 * at arbitrary memory addresses. It must never be passed to
50 * untrusted code.
51 */
52 public synchronized static WhiteBox getWhiteBox() {
53 SecurityManager sm = System.getSecurityManager();
54 if (sm != null) {
55 sm.checkPermission(new WhiteBoxPermission("getInstance"));
56 }
57 return instance;
58 }
59
60 static {
61 registerNatives();
62 }
63
64 // Get the maximum heap size supporting COOPs
65 public native long getCompressedOopsMaxHeapSize();
66 // Arguments
67 public native void printHeapSizes();
68
69 // Memory
70 public native long getObjectAddress(Object o);
71 public native int getHeapOopSize();
72
73 // Runtime
74 // Make sure class name is in the correct format
75 public boolean isClassAlive(String name) {
76 return isClassAlive0(name.replace('.', '/'));
77 }
78 private native boolean isClassAlive0(String name);
79
80 // G1
81 public native boolean g1InConcurrentMark();
82 public native boolean g1IsHumongous(Object o);
83 public native long g1NumFreeRegions();
84 public native int g1RegionSize();
85 public native Object[] parseCommandLine(String commandline, DiagnosticCommand[] args);
86
87 // NMT
88 public native long NMTMalloc(long size);
89 public native void NMTFree(long mem);
90 public native long NMTReserveMemory(long size);
91 public native void NMTCommitMemory(long addr, long size);
92 public native void NMTUncommitMemory(long addr, long size);
93 public native void NMTReleaseMemory(long addr, long size);
94 public native boolean NMTWaitForDataMerge();
95 public native boolean NMTIsDetailSupported();
96
97 // Compiler
98 public native void deoptimizeAll();
99 public boolean isMethodCompiled(Executable method) {
100 return isMethodCompiled(method, false /*not osr*/);
101 }
102 public native boolean isMethodCompiled(Executable method, boolean isOsr);
103 public boolean isMethodCompilable(Executable method) {
104 return isMethodCompilable(method, -1 /*any*/);
105 }
106 public boolean isMethodCompilable(Executable method, int compLevel) {
107 return isMethodCompilable(method, compLevel, false /*not osr*/);
108 }
109 public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr);
110 public native boolean isMethodQueuedForCompilation(Executable method);
111 public int deoptimizeMethod(Executable method) {
112 return deoptimizeMethod(method, false /*not osr*/);
113 }
114 public native int deoptimizeMethod(Executable method, boolean isOsr);
115 public void makeMethodNotCompilable(Executable method) {
116 makeMethodNotCompilable(method, -1 /*any*/);
117 }
118 public void makeMethodNotCompilable(Executable method, int compLevel) {
119 makeMethodNotCompilable(method, compLevel, false /*not osr*/);
120 }
121 public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr);
122 public int getMethodCompilationLevel(Executable method) {
123 return getMethodCompilationLevel(method, false /*not ost*/);
124 }
125 public native int getMethodCompilationLevel(Executable method, boolean isOsr);
126 public native boolean testSetDontInlineMethod(Executable method, boolean value);
127 public int getCompileQueuesSize() {
128 return getCompileQueueSize(-1 /*any*/);
129 }
130 public native int getCompileQueueSize(int compLevel);
131 public native boolean testSetForceInlineMethod(Executable method, boolean value);
132 public boolean enqueueMethodForCompilation(Executable method, int compLevel) {
133 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
134 }
135 public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci);
136 public native void clearMethodState(Executable method);
137 public native int getMethodEntryBci(Executable method);
138 public native Object[] getNMethod(Executable method, boolean isOsr);
139
140 // Intered strings
141 public native boolean isInStringTable(String str);
142
143 // Memory
144 public native void readReservedMemory();
145
146 // force Full GC
147 public native void fullGC();
148
149 // Tests on ReservedSpace/VirtualSpace classes
150 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
151 public native void runMemoryUnitTests();
152 public native void readFromNoaccessArea();
153
154 // CPU features
155 public native String getCPUFeatures();
156
157 }