WhiteBox.java revision 1401:ac9cd1bfab1d 
1/*
2 * Copyright (c) 2012, 2015, 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  public native boolean isMonitorInflated(Object obj);
88  public native void forceSafepoint();
89
90  // JVMTI
91  public native void addToBootstrapClassLoaderSearch(String segment);
92  public native void addToSystemClassLoaderSearch(String segment);
93
94  // G1
95  public native boolean g1InConcurrentMark();
96  public native boolean g1IsHumongous(Object o);
97  public native long    g1NumFreeRegions();
98  public native int     g1RegionSize();
99  public native Object[]    parseCommandLine(String commandline, char delim, DiagnosticCommand[] args);
100
101  // NMT
102  public native long NMTMalloc(long size);
103  public native void NMTFree(long mem);
104  public native long NMTReserveMemory(long size);
105  public native void NMTCommitMemory(long addr, long size);
106  public native void NMTUncommitMemory(long addr, long size);
107  public native void NMTReleaseMemory(long addr, long size);
108  public native long NMTMallocWithPseudoStack(long size, int index);
109  public native boolean NMTChangeTrackingLevel();
110  public native int NMTGetHashSize();
111
112  // Compiler
113  public native int     deoptimizeFrames(boolean makeNotEntrant);
114  public native void    deoptimizeAll();
115  public        boolean isMethodCompiled(Executable method) {
116    return isMethodCompiled(method, false /*not osr*/);
117  }
118  public native boolean isMethodCompiled(Executable method, boolean isOsr);
119  public        boolean isMethodCompilable(Executable method) {
120    return isMethodCompilable(method, -1 /*any*/);
121  }
122  public        boolean isMethodCompilable(Executable method, int compLevel) {
123    return isMethodCompilable(method, compLevel, false /*not osr*/);
124  }
125  public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr);
126  public native boolean isMethodQueuedForCompilation(Executable method);
127  public        int     deoptimizeMethod(Executable method) {
128    return deoptimizeMethod(method, false /*not osr*/);
129  }
130  public native int     deoptimizeMethod(Executable method, boolean isOsr);
131  public        void    makeMethodNotCompilable(Executable method) {
132    makeMethodNotCompilable(method, -1 /*any*/);
133  }
134  public        void    makeMethodNotCompilable(Executable method, int compLevel) {
135    makeMethodNotCompilable(method, compLevel, false /*not osr*/);
136  }
137  public native void    makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr);
138  public        int     getMethodCompilationLevel(Executable method) {
139    return getMethodCompilationLevel(method, false /*not ost*/);
140  }
141  public native int     getMethodCompilationLevel(Executable method, boolean isOsr);
142  public native boolean testSetDontInlineMethod(Executable method, boolean value);
143  public        int     getCompileQueuesSize() {
144    return getCompileQueueSize(-1 /*any*/);
145  }
146  public native int     getCompileQueueSize(int compLevel);
147  public native boolean testSetForceInlineMethod(Executable method, boolean value);
148  public        boolean enqueueMethodForCompilation(Executable method, int compLevel) {
149    return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
150  }
151  public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci);
152  public native void    clearMethodState(Executable method);
153  public native void    lockCompilation();
154  public native void    unlockCompilation();
155  public native int     getMethodEntryBci(Executable method);
156  public native Object[] getNMethod(Executable method, boolean isOsr);
157  public native long    allocateCodeBlob(int size, int type);
158  public        long    allocateCodeBlob(long size, int type) {
159      int intSize = (int) size;
160      if ((long) intSize != size || size < 0) {
161          throw new IllegalArgumentException(
162                "size argument has illegal value " + size);
163      }
164      return allocateCodeBlob( intSize, type);
165  }
166  public native void    freeCodeBlob(long addr);
167  public        void    forceNMethodSweep() {
168    try {
169        forceNMethodSweep0().join();
170    } catch (InterruptedException e) {
171        Thread.currentThread().interrupt();
172    }
173  }
174  public native Thread  forceNMethodSweep0();
175  public native Object[] getCodeHeapEntries(int type);
176  public native int     getCompilationActivityMode();
177  public native Object[] getCodeBlob(long addr);
178
179  // Intered strings
180  public native boolean isInStringTable(String str);
181
182  // Memory
183  public native void readReservedMemory();
184  public native long allocateMetaspace(ClassLoader classLoader, long size);
185  public native void freeMetaspace(ClassLoader classLoader, long addr, long size);
186  public native long incMetaspaceCapacityUntilGC(long increment);
187  public native long metaspaceCapacityUntilGC();
188
189  // Force Young GC
190  public native void youngGC();
191
192  // Force Full GC
193  public native void fullGC();
194
195  // Method tries to start concurrent mark cycle.
196  // It returns false if CM Thread is always in concurrent cycle.
197  public native boolean g1StartConcMarkCycle();
198
199  // Tests on ReservedSpace/VirtualSpace classes
200  public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
201  public native void runMemoryUnitTests();
202  public native void readFromNoaccessArea();
203  public native long getThreadStackSize();
204  public native long getThreadRemainingStackSize();
205
206  // CPU features
207  public native String getCPUFeatures();
208
209  // Native extensions
210  public native long getHeapUsageForContext(int context);
211  public native long getHeapRegionCountForContext(int context);
212  public native int getContextForObject(Object obj);
213  public native void printRegionInfo(int context);
214
215  // VM flags
216  public native boolean isConstantVMFlag(String name);
217  public native boolean isLockedVMFlag(String name);
218  public native void    setBooleanVMFlag(String name, boolean value);
219  public native void    setIntxVMFlag(String name, long value);
220  public native void    setUintxVMFlag(String name, long value);
221  public native void    setUint64VMFlag(String name, long value);
222  public native void    setSizeTVMFlag(String name, long value);
223  public native void    setStringVMFlag(String name, String value);
224  public native void    setDoubleVMFlag(String name, double value);
225  public native Boolean getBooleanVMFlag(String name);
226  public native Long    getIntxVMFlag(String name);
227  public native Long    getUintxVMFlag(String name);
228  public native Long    getUint64VMFlag(String name);
229  public native Long    getSizeTVMFlag(String name);
230  public native String  getStringVMFlag(String name);
231  public native Double  getDoubleVMFlag(String name);
232  private final List<Function<String,Object>> flagsGetters = Arrays.asList(
233    this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag,
234    this::getUint64VMFlag, this::getSizeTVMFlag, this::getStringVMFlag,
235    this::getDoubleVMFlag);
236
237  public Object getVMFlag(String name) {
238    return flagsGetters.stream()
239                       .map(f -> f.apply(name))
240                       .filter(x -> x != null)
241                       .findAny()
242                       .orElse(null);
243  }
244  public native int getOffsetForName0(String name);
245  public int getOffsetForName(String name) throws Exception {
246    int offset = getOffsetForName0(name);
247    if (offset == -1) {
248      throw new RuntimeException(name + " not found");
249    }
250    return offset;
251  }
252
253  // Safepoint Checking
254  public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue);
255}
256