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 java.net.URL;
34
35 import sun.hotspot.parser.DiagnosticCommand;
36
37 public class WhiteBox {
38
39 @SuppressWarnings("serial")
40 public static class WhiteBoxPermission extends BasicPermission {
41 public WhiteBoxPermission(String s) {
42 super(s);
43 }
44 }
45
46 private WhiteBox() {}
47 private static final WhiteBox instance = new WhiteBox();
48 private static native void registerNatives();
49
50 /**
51 * Returns the singleton WhiteBox instance.
52 *
53 * The returned WhiteBox object should be carefully guarded
54 * by the caller, since it can be used to read and write data
55 * at arbitrary memory addresses. It must never be passed to
56 * untrusted code.
57 */
58 public synchronized static WhiteBox getWhiteBox() {
59 SecurityManager sm = System.getSecurityManager();
60 if (sm != null) {
61 sm.checkPermission(new WhiteBoxPermission("getInstance"));
62 }
63 return instance;
64 }
65
66 static {
67 registerNatives();
68 }
69
70 // Get the maximum heap size supporting COOPs
71 public native long getCompressedOopsMaxHeapSize();
72 // Arguments
73 public native void printHeapSizes();
74
75 // Memory
76 public native long getObjectAddress(Object o);
77 public native int getHeapOopSize();
78 public native int getVMPageSize();
79 public native long getVMLargePageSize();
80
81 public native boolean isObjectInOldGen(Object o);
82 public native long getObjectSize(Object o);
83
84 // Runtime
85 // Make sure class name is in the correct format
86 public boolean isClassAlive(String name) {
87 return isClassAlive0(name.replace('.', '/'));
88 }
89 private native boolean isClassAlive0(String name);
90 public native boolean isMonitorInflated(Object obj);
91 public native void forceSafepoint();
92
93 // Resource/Class Lookup Cache
94 public native boolean classKnownToNotExist(ClassLoader loader, String name);
95 public native URL[] getLookupCacheURLs(ClassLoader loader);
96 public native int[] getLookupCacheMatches(ClassLoader loader, String name);
97
98 // JVMTI
99 public native void addToBootstrapClassLoaderSearch(String segment);
100 public native void addToSystemClassLoaderSearch(String segment);
101
102 // G1
103 public native boolean g1InConcurrentMark();
104 public native boolean g1IsHumongous(Object o);
105 public native long g1NumFreeRegions();
106 public native int g1RegionSize();
107 public native Object[] parseCommandLine(String commandline, DiagnosticCommand[] args);
108
109 // NMT
110 public native long NMTMalloc(long size);
111 public native void NMTFree(long mem);
112 public native long NMTReserveMemory(long size);
113 public native void NMTCommitMemory(long addr, long size);
114 public native void NMTUncommitMemory(long addr, long size);
115 public native void NMTReleaseMemory(long addr, long size);
116 public native long NMTMallocWithPseudoStack(long size, int index);
117 public native boolean NMTIsDetailSupported();
118 public native boolean NMTChangeTrackingLevel();
119 public native int NMTGetHashSize();
120
121 // Compiler
122 public native void deoptimizeAll();
123 public boolean isMethodCompiled(Executable method) {
124 return isMethodCompiled(method, false /*not osr*/);
125 }
126 public native boolean isMethodCompiled(Executable method, boolean isOsr);
127 public boolean isMethodCompilable(Executable method) {
128 return isMethodCompilable(method, -1 /*any*/);
129 }
130 public boolean isMethodCompilable(Executable method, int compLevel) {
131 return isMethodCompilable(method, compLevel, false /*not osr*/);
132 }
133 public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr);
134 public native boolean isMethodQueuedForCompilation(Executable method);
135 public int deoptimizeMethod(Executable method) {
136 return deoptimizeMethod(method, false /*not osr*/);
137 }
138 public native int deoptimizeMethod(Executable method, boolean isOsr);
139 public void makeMethodNotCompilable(Executable method) {
140 makeMethodNotCompilable(method, -1 /*any*/);
141 }
142 public void makeMethodNotCompilable(Executable method, int compLevel) {
143 makeMethodNotCompilable(method, compLevel, false /*not osr*/);
144 }
145 public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr);
146 public int getMethodCompilationLevel(Executable method) {
147 return getMethodCompilationLevel(method, false /*not ost*/);
148 }
149 public native int getMethodCompilationLevel(Executable method, boolean isOsr);
150 public native boolean testSetDontInlineMethod(Executable method, boolean value);
151 public int getCompileQueuesSize() {
152 return getCompileQueueSize(-1 /*any*/);
153 }
154 public native int getCompileQueueSize(int compLevel);
155 public native boolean testSetForceInlineMethod(Executable method, boolean value);
156 public boolean enqueueMethodForCompilation(Executable method, int compLevel) {
157 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
158 }
159 public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci);
160 public native void clearMethodState(Executable method);
161 public native int getMethodEntryBci(Executable method);
162 public native Object[] getNMethod(Executable method, boolean isOsr);
163
164 // Intered strings
165 public native boolean isInStringTable(String str);
166
167 // Memory
168 public native void readReservedMemory();
169 public native long allocateMetaspace(ClassLoader classLoader, long size);
170 public native void freeMetaspace(ClassLoader classLoader, long addr, long size);
171 public native long incMetaspaceCapacityUntilGC(long increment);
172 public native long metaspaceCapacityUntilGC();
173
174 // force Young GC
175 public native void youngGC();
176
177 // force Full GC
178 public native void fullGC();
179
180 // Tests on ReservedSpace/VirtualSpace classes
181 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
182 public native void runMemoryUnitTests();
183 public native void readFromNoaccessArea();
184 public native long getThreadStackSize();
185 public native long getThreadRemainingStackSize();
186
187 // CPU features
188 public native String getCPUFeatures();
189
190 // Native extensions
191 public native long getHeapUsageForContext(int context);
192 public native long getHeapRegionCountForContext(int context);
193 public native int getContextForObject(Object obj);
194 public native void printRegionInfo(int context);
195
196 // VM flags
197 public native void setBooleanVMFlag(String name, boolean value);
198 public native void setIntxVMFlag(String name, long value);
199 public native void setUintxVMFlag(String name, long value);
200 public native void setUint64VMFlag(String name, long value);
201 public native void setStringVMFlag(String name, String value);
202 public native void setDoubleVMFlag(String name, double value);
203 public native Boolean getBooleanVMFlag(String name);
204 public native Long getIntxVMFlag(String name);
205 public native Long getUintxVMFlag(String name);
206 public native Long getUint64VMFlag(String name);
207 public native String getStringVMFlag(String name);
208 public native Double getDoubleVMFlag(String name);
209 private final List<Function<String,Object>> flagsGetters = Arrays.asList(
210 this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag,
211 this::getUint64VMFlag, this::getStringVMFlag, this::getDoubleVMFlag);
212
213 public Object getVMFlag(String name) {
214 return flagsGetters.stream()
215 .map(f -> f.apply(name))
216 .filter(x -> x != null)
217 .findAny()
218 .orElse(null);
219 }
220 public native int getOffsetForName0(String name);
221 public int getOffsetForName(String name) throws Exception {
222 int offset = getOffsetForName0(name);
223 if (offset == -1) {
224 throw new RuntimeException(name + " not found");
225 }
226 return offset;
227 }
228
229 }