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
77 // Runtime
78 // Make sure class name is in the correct format
79 public boolean isClassAlive(String name) {
80 return isClassAlive0(name.replace('.', '/'));
81 }
82 private native boolean isClassAlive0(String name);
83
84 // G1
85 public native boolean g1InConcurrentMark();
86 public native boolean g1IsHumongous(Object o);
87 public native long g1NumFreeRegions();
88 public native int g1RegionSize();
89 public native Object[] parseCommandLine(String commandline, DiagnosticCommand[] args);
90
91 // NMT
92 public native long NMTMalloc(long size);
93 public native void NMTFree(long mem);
94 public native long NMTReserveMemory(long size);
95 public native void NMTCommitMemory(long addr, long size);
96 public native void NMTUncommitMemory(long addr, long size);
97 public native void NMTReleaseMemory(long addr, long size);
98 public native void NMTOverflowHashBucket(long num);
99 public native long NMTMallocWithPseudoStack(long size, int index);
100 public native boolean NMTIsDetailSupported();
101
102 // Compiler
103 public native void deoptimizeAll();
104 public boolean isMethodCompiled(Executable method) {
105 return isMethodCompiled(method, false /*not osr*/);
106 }
107 public native boolean isMethodCompiled(Executable method, boolean isOsr);
108 public boolean isMethodCompilable(Executable method) {
109 return isMethodCompilable(method, -1 /*any*/);
110 }
111 public boolean isMethodCompilable(Executable method, int compLevel) {
112 return isMethodCompilable(method, compLevel, false /*not osr*/);
113 }
114 public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr);
115 public native boolean isMethodQueuedForCompilation(Executable method);
116 public int deoptimizeMethod(Executable method) {
117 return deoptimizeMethod(method, false /*not osr*/);
118 }
119 public native int deoptimizeMethod(Executable method, boolean isOsr);
120 public void makeMethodNotCompilable(Executable method) {
121 makeMethodNotCompilable(method, -1 /*any*/);
122 }
123 public void makeMethodNotCompilable(Executable method, int compLevel) {
124 makeMethodNotCompilable(method, compLevel, false /*not osr*/);
125 }
126 public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr);
127 public int getMethodCompilationLevel(Executable method) {
128 return getMethodCompilationLevel(method, false /*not ost*/);
129 }
130 public native int getMethodCompilationLevel(Executable method, boolean isOsr);
131 public native boolean testSetDontInlineMethod(Executable method, boolean value);
132 public int getCompileQueuesSize() {
133 return getCompileQueueSize(-1 /*any*/);
134 }
135 public native int getCompileQueueSize(int compLevel);
136 public native boolean testSetForceInlineMethod(Executable method, boolean value);
137 public boolean enqueueMethodForCompilation(Executable method, int compLevel) {
138 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
139 }
140 public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci);
141 public native void clearMethodState(Executable method);
142 public native int getMethodEntryBci(Executable method);
143 public native Object[] getNMethod(Executable method, boolean isOsr);
144
145 // Intered strings
146 public native boolean isInStringTable(String str);
147
148 // Memory
149 public native void readReservedMemory();
150 public native long allocateMetaspace(ClassLoader classLoader, long size);
151 public native void freeMetaspace(ClassLoader classLoader, long addr, long size);
152
153 // force Full GC
154 public native void fullGC();
155
156 // Tests on ReservedSpace/VirtualSpace classes
157 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
158 public native void runMemoryUnitTests();
159 public native void readFromNoaccessArea();
160 public native long getThreadStackSize();
161 public native long getThreadRemainingStackSize();
162
163 // CPU features
164 public native String getCPUFeatures();
165
166 // VM flags
167 public native void setBooleanVMFlag(String name, boolean value);
168 public native void setIntxVMFlag(String name, long value);
169 public native void setUintxVMFlag(String name, long value);
170 public native void setUint64VMFlag(String name, long value);
171 public native void setSizeTVMFlag(String name, long value);
172 public native void setStringVMFlag(String name, String value);
173 public native void setDoubleVMFlag(String name, double value);
174 public native Boolean getBooleanVMFlag(String name);
175 public native Long getIntxVMFlag(String name);
176 public native Long getUintxVMFlag(String name);
177 public native Long getUint64VMFlag(String name);
178 public native Long getSizeTVMFlag(String name);
179 public native String getStringVMFlag(String name);
180 public native Double getDoubleVMFlag(String name);
181 private final List<Function<String,Object>> flagsGetters = Arrays.asList(
182 this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag,
183 this::getUint64VMFlag, this::getSizeTVMFlag, this::getStringVMFlag,
184 this::getDoubleVMFlag);
185
186 public Object getVMFlag(String name) {
187 return flagsGetters.stream()
188 .map(f -> f.apply(name))
189 .filter(x -> x != null)
190 .findAny()
191 .orElse(null);
192 }
193 }