WhiteBox.java revision 1265:c82ea5393dda 
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
25package sun.hotspot;
26
27import java.lang.reflect.Executable;
28import java.util.Arrays;
29import java.util.List;
30import java.util.function.Function;
31import java.util.stream.Stream;
32import java.security.BasicPermission;
33
34import sun.hotspot.parser.DiagnosticCommand;
35
36public 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 int  getVMPageSize();
78  public native boolean isObjectInOldGen(Object o);
79  public native long getObjectSize(Object o);
80
81  // Runtime
82  // Make sure class name is in the correct format
83  public boolean isClassAlive(String name) {
84    return isClassAlive0(name.replace('.', '/'));
85  }
86  private native boolean isClassAlive0(String name);
87
88  // JVMTI
89  public native void addToBootstrapClassLoaderSearch(String segment);
90  public native void addToSystemClassLoaderSearch(String segment);
91
92  // G1
93  public native boolean g1InConcurrentMark();
94  public native boolean g1IsHumongous(Object o);
95  public native long    g1NumFreeRegions();
96  public native int     g1RegionSize();
97  public native Object[]    parseCommandLine(String commandline, char delim, DiagnosticCommand[] args);
98
99  // NMT
100  public native long NMTMalloc(long size);
101  public native void NMTFree(long mem);
102  public native long NMTReserveMemory(long size);
103  public native void NMTCommitMemory(long addr, long size);
104  public native void NMTUncommitMemory(long addr, long size);
105  public native void NMTReleaseMemory(long addr, long size);
106  public native long NMTMallocWithPseudoStack(long size, int index);
107  public native boolean NMTIsDetailSupported();
108  public native boolean NMTChangeTrackingLevel();
109  public native int NMTGetHashSize();
110
111  // Compiler
112  public native void    deoptimizeAll();
113  public        boolean isMethodCompiled(Executable method) {
114    return isMethodCompiled(method, false /*not osr*/);
115  }
116  public native boolean isMethodCompiled(Executable method, boolean isOsr);
117  public        boolean isMethodCompilable(Executable method) {
118    return isMethodCompilable(method, -1 /*any*/);
119  }
120  public        boolean isMethodCompilable(Executable method, int compLevel) {
121    return isMethodCompilable(method, compLevel, false /*not osr*/);
122  }
123  public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr);
124  public native boolean isMethodQueuedForCompilation(Executable method);
125  public        int     deoptimizeMethod(Executable method) {
126    return deoptimizeMethod(method, false /*not osr*/);
127  }
128  public native int     deoptimizeMethod(Executable method, boolean isOsr);
129  public        void    makeMethodNotCompilable(Executable method) {
130    makeMethodNotCompilable(method, -1 /*any*/);
131  }
132  public        void    makeMethodNotCompilable(Executable method, int compLevel) {
133    makeMethodNotCompilable(method, compLevel, false /*not osr*/);
134  }
135  public native void    makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr);
136  public        int     getMethodCompilationLevel(Executable method) {
137    return getMethodCompilationLevel(method, false /*not ost*/);
138  }
139  public native int     getMethodCompilationLevel(Executable method, boolean isOsr);
140  public native boolean testSetDontInlineMethod(Executable method, boolean value);
141  public        int     getCompileQueuesSize() {
142    return getCompileQueueSize(-1 /*any*/);
143  }
144  public native int     getCompileQueueSize(int compLevel);
145  public native boolean testSetForceInlineMethod(Executable method, boolean value);
146  public        boolean enqueueMethodForCompilation(Executable method, int compLevel) {
147    return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
148  }
149  public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci);
150  public native void    clearMethodState(Executable method);
151  public native void    lockCompilation();
152  public native void    unlockCompilation();
153  public native int     getMethodEntryBci(Executable method);
154  public native Object[] getNMethod(Executable method, boolean isOsr);
155  public native long    allocateCodeBlob(int size, int type);
156  public        long    allocateCodeBlob(long size, int type) {
157      int intSize = (int) size;
158      if ((long) intSize != size || size < 0) {
159          throw new IllegalArgumentException(
160                "size argument has illegal value " + size);
161      }
162      return allocateCodeBlob( intSize, type);
163  }
164  public native void    freeCodeBlob(long addr);
165  public        void    forceNMethodSweep() {
166    try {
167        forceNMethodSweep0().join();
168    } catch (InterruptedException e) {
169        Thread.currentThread().interrupt();
170    }
171  }
172  public native Thread  forceNMethodSweep0();
173  public native Object[] getCodeHeapEntries(int type);
174  public native int     getCompilationActivityMode();
175  public native Object[] getCodeBlob(long addr);
176
177  // Intered strings
178  public native boolean isInStringTable(String str);
179
180  // Memory
181  public native void readReservedMemory();
182  public native long allocateMetaspace(ClassLoader classLoader, long size);
183  public native void freeMetaspace(ClassLoader classLoader, long addr, long size);
184  public native long incMetaspaceCapacityUntilGC(long increment);
185  public native long metaspaceCapacityUntilGC();
186
187  // Force Young GC
188  public native void youngGC();
189
190  // Force Full GC
191  public native void fullGC();
192
193  // Method tries to start concurrent mark cycle.
194  // It returns false if CM Thread is always in concurrent cycle.
195  public native boolean g1StartConcMarkCycle();
196
197  // Tests on ReservedSpace/VirtualSpace classes
198  public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
199  public native void runMemoryUnitTests();
200  public native void readFromNoaccessArea();
201  public native long getThreadStackSize();
202  public native long getThreadRemainingStackSize();
203
204  // CPU features
205  public native String getCPUFeatures();
206
207  // Native extensions
208  public native long getHeapUsageForContext(int context);
209  public native long getHeapRegionCountForContext(int context);
210  public native int getContextForObject(Object obj);
211  public native void printRegionInfo(int context);
212
213  // VM flags
214  public native boolean isConstantVMFlag(String name);
215  public native boolean isLockedVMFlag(String name);
216  public native void    setBooleanVMFlag(String name, boolean value);
217  public native void    setIntxVMFlag(String name, long value);
218  public native void    setUintxVMFlag(String name, long value);
219  public native void    setUint64VMFlag(String name, long value);
220  public native void    setSizeTVMFlag(String name, long value);
221  public native void    setStringVMFlag(String name, String value);
222  public native void    setDoubleVMFlag(String name, double value);
223  public native Boolean getBooleanVMFlag(String name);
224  public native Long    getIntxVMFlag(String name);
225  public native Long    getUintxVMFlag(String name);
226  public native Long    getUint64VMFlag(String name);
227  public native Long    getSizeTVMFlag(String name);
228  public native String  getStringVMFlag(String name);
229  public native Double  getDoubleVMFlag(String name);
230  private final List<Function<String,Object>> flagsGetters = Arrays.asList(
231    this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag,
232    this::getUint64VMFlag, this::getSizeTVMFlag, this::getStringVMFlag,
233    this::getDoubleVMFlag);
234
235  public Object getVMFlag(String name) {
236    return flagsGetters.stream()
237                       .map(f -> f.apply(name))
238                       .filter(x -> x != null)
239                       .findAny()
240                       .orElse(null);
241  }
242  public native int getOffsetForName0(String name);
243  public int getOffsetForName(String name) throws Exception {
244    int offset = getOffsetForName0(name);
245    if (offset == -1) {
246      throw new RuntimeException(name + " not found");
247    }
248    return offset;
249  }
250
251}
252