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
34 import sun.hotspot.parser.DiagnosticCommand;
35
36 public class WhiteBox {
37
38 @SuppressWarnings("serial")
39 public static class WhiteBoxPermission extends BasicPermission {
40 public WhiteBoxPermission(String s) {
41 super(s);
42 }
43 }
44
45 private WhiteBox() {}
46 private static final WhiteBox instance = new WhiteBox();
47 private static native void registerNatives();
48
49 /**
50 * Returns the singleton WhiteBox instance.
51 *
52 * The returned WhiteBox object should be carefully guarded
53 * by the caller, since it can be used to read and write data
54 * at arbitrary memory addresses. It must never be passed to
55 * untrusted code.
56 */
57 public synchronized static WhiteBox getWhiteBox() {
58 SecurityManager sm = System.getSecurityManager();
59 if (sm != null) {
60 sm.checkPermission(new WhiteBoxPermission("getInstance"));
61 }
62 return instance;
63 }
64
65 static {
66 registerNatives();
67 }
68
69 // Get the maximum heap size supporting COOPs
70 public native long getCompressedOopsMaxHeapSize();
71 // Arguments
72 public native void printHeapSizes();
73
74 // Memory
75 public native long getObjectAddress(Object o);
76 public native int getHeapOopSize();
77 public native boolean isObjectInOldGen(Object o);
78 public native long getObjectSize(Object o);
79
80 // Runtime
81 // Make sure class name is in the correct format
82 public boolean isClassAlive(String name) {
83 return isClassAlive0(name.replace('.', '/'));
84 }
85 private native boolean isClassAlive0(String name);
86
87 // G1
88 public native boolean g1InConcurrentMark();
89 public native boolean g1IsHumongous(Object o);
90 public native long g1NumFreeRegions();
91 public native int g1RegionSize();
92 public native Object[] parseCommandLine(String commandline, DiagnosticCommand[] args);
93
94 // NMT
95 public native long NMTMalloc(long size);
96 public native void NMTFree(long mem);
97 public native long NMTReserveMemory(long size);
98 public native void NMTCommitMemory(long addr, long size);
99 public native void NMTUncommitMemory(long addr, long size);
100 public native void NMTReleaseMemory(long addr, long size);
101 public native void NMTOverflowHashBucket(long num);
102 public native long NMTMallocWithPseudoStack(long size, int index);
103 public native boolean NMTIsDetailSupported();
104 public native boolean NMTChangeTrackingLevel();
105
106 // Compiler
107 public native void deoptimizeAll();
108 public boolean isMethodCompiled(Executable method) {
109 return isMethodCompiled(method, false /*not osr*/);
110 }
111 public native boolean isMethodCompiled(Executable method, boolean isOsr);
112 public boolean isMethodCompilable(Executable method) {
113 return isMethodCompilable(method, -1 /*any*/);
114 }
115 public boolean isMethodCompilable(Executable method, int compLevel) {
116 return isMethodCompilable(method, compLevel, false /*not osr*/);
117 }
118 public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr);
119 public native boolean isMethodQueuedForCompilation(Executable method);
120 public int deoptimizeMethod(Executable method) {
121 return deoptimizeMethod(method, false /*not osr*/);
122 }
123 public native int deoptimizeMethod(Executable method, boolean isOsr);
124 public void makeMethodNotCompilable(Executable method) {
125 makeMethodNotCompilable(method, -1 /*any*/);
126 }
127 public void makeMethodNotCompilable(Executable method, int compLevel) {
128 makeMethodNotCompilable(method, compLevel, false /*not osr*/);
129 }
130 public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr);
131 public int getMethodCompilationLevel(Executable method) {
132 return getMethodCompilationLevel(method, false /*not ost*/);
133 }
134 public native int getMethodCompilationLevel(Executable method, boolean isOsr);
135 public native boolean testSetDontInlineMethod(Executable method, boolean value);
136 public int getCompileQueuesSize() {
137 return getCompileQueueSize(-1 /*any*/);
138 }
139 public native int getCompileQueueSize(int compLevel);
140 public native boolean testSetForceInlineMethod(Executable method, boolean value);
141 public boolean enqueueMethodForCompilation(Executable method, int compLevel) {
142 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
143 }
144 public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci);
145 public native void clearMethodState(Executable method);
146 public native int getMethodEntryBci(Executable method);
147 public native Object[] getNMethod(Executable method, boolean isOsr);
148
149 // Intered strings
150 public native boolean isInStringTable(String str);
151
152 // Memory
153 public native void readReservedMemory();
154 public native long allocateMetaspace(ClassLoader classLoader, long size);
155 public native void freeMetaspace(ClassLoader classLoader, long addr, long size);
156 public native long incMetaspaceCapacityUntilGC(long increment);
157 public native long metaspaceCapacityUntilGC();
158
159 // force Young GC
160 public native void youngGC();
161
162 // force Full GC
163 public native void fullGC();
164
165 // Tests on ReservedSpace/VirtualSpace classes
166 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
167 public native void runMemoryUnitTests();
168 public native void readFromNoaccessArea();
169 public native long getThreadStackSize();
170 public native long getThreadRemainingStackSize();
171
172 // CPU features
173 public native String getCPUFeatures();
174
175 // Native extensions
176 public native long getHeapUsageForContext(int context);
177 public native long getHeapRegionCountForContext(int context);
178 public native int getContextForObject(Object obj);
179 public native void printRegionInfo(int context);
180
181 // VM flags
182 public native void setBooleanVMFlag(String name, boolean value);
183 public native void setIntxVMFlag(String name, long value);
184 public native void setUintxVMFlag(String name, long value);
185 public native void setUint64VMFlag(String name, long value);
186 public native void setSizeTVMFlag(String name, long value);
187 public native void setStringVMFlag(String name, String value);
188 public native void setDoubleVMFlag(String name, double value);
189 public native Boolean getBooleanVMFlag(String name);
190 public native Long getIntxVMFlag(String name);
191 public native Long getUintxVMFlag(String name);
192 public native Long getUint64VMFlag(String name);
193 public native Long getSizeTVMFlag(String name);
194 public native String getStringVMFlag(String name);
195 public native Double getDoubleVMFlag(String name);
196 private final List<Function<String,Object>> flagsGetters = Arrays.asList(
197 this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag,
198 this::getUint64VMFlag, this::getSizeTVMFlag, this::getStringVMFlag,
199 this::getDoubleVMFlag);
200
201 public Object getVMFlag(String name) {
202 return flagsGetters.stream()
203 .map(f -> f.apply(name))
204 .filter(x -> x != null)
205 .findAny()
206 .orElse(null);
207 }
208 }