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.util.Arrays;
29 import java.util.List;
30 import java.util.function.Function;
31 import java.util.stream.Stream;
32 import java.security.BasicPermission;
33 import sun.hotspot.parser.DiagnosticCommand;
34
35 public class WhiteBox {
36
37 @SuppressWarnings("serial")
38 public static class WhiteBoxPermission extends BasicPermission {
39 public WhiteBoxPermission(String s) {
40 super(s);
41 }
42 }
43
44 private WhiteBox() {}
45 private static final WhiteBox instance = new WhiteBox();
46 private static native void registerNatives();
47
48 /**
49 * Returns the singleton WhiteBox instance.
50 *
51 * The returned WhiteBox object should be carefully guarded
52 * by the caller, since it can be used to read and write data
53 * at arbitrary memory addresses. It must never be passed to
54 * untrusted code.
55 */
56 public synchronized static WhiteBox getWhiteBox() {
57 SecurityManager sm = System.getSecurityManager();
58 if (sm != null) {
59 sm.checkPermission(new WhiteBoxPermission("getInstance"));
60 }
61 return instance;
62 }
63
64 static {
65 registerNatives();
66 }
67
68 // Get the maximum heap size supporting COOPs
69 public native long getCompressedOopsMaxHeapSize();
70 // Arguments
71 public native void printHeapSizes();
72
73 // Memory
74 public native long getObjectAddress(Object o);
75 public native int getHeapOopSize();
76 public native boolean isObjectInOldGen(Object o);
77 public native long getObjectSize(Object o);
78
79 // Runtime
80 // Make sure class name is in the correct format
81 public boolean isClassAlive(String name) {
82 return isClassAlive0(name.replace('.', '/'));
83 }
84 private native boolean isClassAlive0(String name);
85
86 // G1
87 public native boolean g1InConcurrentMark();
88 public native boolean g1IsHumongous(Object o);
89 public native long g1NumFreeRegions();
90 public native int g1RegionSize();
91 public native Object[] parseCommandLine(String commandline, DiagnosticCommand[] args);
92
93 // NMT
94 public native long NMTMalloc(long size);
95 public native void NMTFree(long mem);
96 public native long NMTReserveMemory(long size);
97 public native void NMTCommitMemory(long addr, long size);
98 public native void NMTUncommitMemory(long addr, long size);
99 public native void NMTReleaseMemory(long addr, long size);
100 public native void NMTOverflowHashBucket(long num);
101 public native long NMTMallocWithPseudoStack(long size, int index);
102 public native boolean NMTIsDetailSupported();
103
104 // Compiler
105 public native void deoptimizeAll();
106 public boolean isMethodCompiled(Executable method) {
107 return isMethodCompiled(method, false /*not osr*/);
108 }
109 public native boolean isMethodCompiled(Executable method, boolean isOsr);
110 public boolean isMethodCompilable(Executable method) {
111 return isMethodCompilable(method, -1 /*any*/);
112 }
113 public boolean isMethodCompilable(Executable method, int compLevel) {
114 return isMethodCompilable(method, compLevel, false /*not osr*/);
115 }
116 public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr);
117 public native boolean isMethodQueuedForCompilation(Executable method);
118 public int deoptimizeMethod(Executable method) {
119 return deoptimizeMethod(method, false /*not osr*/);
120 }
121 public native int deoptimizeMethod(Executable method, boolean isOsr);
122 public void makeMethodNotCompilable(Executable method) {
123 makeMethodNotCompilable(method, -1 /*any*/);
124 }
125 public void makeMethodNotCompilable(Executable method, int compLevel) {
126 makeMethodNotCompilable(method, compLevel, false /*not osr*/);
127 }
128 public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr);
129 public int getMethodCompilationLevel(Executable method) {
130 return getMethodCompilationLevel(method, false /*not ost*/);
131 }
132 public native int getMethodCompilationLevel(Executable method, boolean isOsr);
133 public native boolean testSetDontInlineMethod(Executable method, boolean value);
134 public int getCompileQueuesSize() {
135 return getCompileQueueSize(-1 /*any*/);
136 }
137 public native int getCompileQueueSize(int compLevel);
138 public native boolean testSetForceInlineMethod(Executable method, boolean value);
139 public boolean enqueueMethodForCompilation(Executable method, int compLevel) {
140 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
141 }
142 public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci);
143 public native void clearMethodState(Executable method);
144 public native int getMethodEntryBci(Executable method);
145 public native Object[] getNMethod(Executable method, boolean isOsr);
146
147 // Intered strings
148 public native boolean isInStringTable(String str);
149
150 // Memory
151 public native void readReservedMemory();
152 public native long allocateMetaspace(ClassLoader classLoader, long size);
153 public native void freeMetaspace(ClassLoader classLoader, long addr, long size);
154
155 // force Young GC
156 public native void youngGC();
157
158 // force Full GC
159 public native void fullGC();
160
161 // Tests on ReservedSpace/VirtualSpace classes
162 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
163 public native void runMemoryUnitTests();
164 public native void readFromNoaccessArea();
165 public native long getThreadStackSize();
166 public native long getThreadRemainingStackSize();
167
168 // CPU features
169 public native String getCPUFeatures();
170
171 // VM flags
172 public native void setBooleanVMFlag(String name, boolean value);
173 public native void setIntxVMFlag(String name, long value);
174 public native void setUintxVMFlag(String name, long value);
175 public native void setUint64VMFlag(String name, long value);
176 public native void setSizeTVMFlag(String name, long value);
177 public native void setStringVMFlag(String name, String value);
178 public native void setDoubleVMFlag(String name, double value);
179 public native Boolean getBooleanVMFlag(String name);
180 public native Long getIntxVMFlag(String name);
181 public native Long getUintxVMFlag(String name);
182 public native Long getUint64VMFlag(String name);
183 public native Long getSizeTVMFlag(String name);
184 public native String getStringVMFlag(String name);
185 public native Double getDoubleVMFlag(String name);
186 private final List<Function<String,Object>> flagsGetters = Arrays.asList(
187 this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag,
188 this::getUint64VMFlag, this::getSizeTVMFlag, this::getStringVMFlag,
189 this::getDoubleVMFlag);
190
191 public Object getVMFlag(String name) {
192 return flagsGetters.stream()
193 .map(f -> f.apply(name))
194 .filter(x -> x != null)
195 .findAny()
196 .orElse(null);
197 }
198 }