WhiteBox.java revision 1412:0871d61e2534 
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.management.MemoryUsage;
28import java.lang.reflect.Executable;
29import java.util.Arrays;
30import java.util.List;
31import java.util.function.Function;
32import java.util.stream.Stream;
33import java.security.BasicPermission;
34
35import sun.hotspot.parser.DiagnosticCommand;
36
37public 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 boolean isObjectInOldGen(Object o);
80  public native long getObjectSize(Object o);
81
82  // Runtime
83  // Make sure class name is in the correct format
84  public boolean isClassAlive(String name) {
85    return isClassAlive0(name.replace('.', '/'));
86  }
87  private native boolean isClassAlive0(String name);
88  public native boolean isMonitorInflated(Object obj);
89  public native void forceSafepoint();
90
91  // JVMTI
92  public native void addToBootstrapClassLoaderSearch(String segment);
93  public native void addToSystemClassLoaderSearch(String segment);
94
95  // G1
96  public native boolean g1InConcurrentMark();
97  public native boolean g1IsHumongous(Object o);
98  public native long    g1NumMaxRegions();
99  public native long    g1NumFreeRegions();
100  public native int     g1RegionSize();
101  public native MemoryUsage g1AuxiliaryMemoryUsage();
102  public native Object[]    parseCommandLine(String commandline, char delim, DiagnosticCommand[] args);
103
104  // NMT
105  public native long NMTMalloc(long size);
106  public native void NMTFree(long mem);
107  public native long NMTReserveMemory(long size);
108  public native void NMTCommitMemory(long addr, long size);
109  public native void NMTUncommitMemory(long addr, long size);
110  public native void NMTReleaseMemory(long addr, long size);
111  public native long NMTMallocWithPseudoStack(long size, int index);
112  public native boolean NMTIsDetailSupported();
113  public native boolean NMTChangeTrackingLevel();
114  public native int NMTGetHashSize();
115
116  // Compiler
117  public native int     deoptimizeFrames(boolean makeNotEntrant);
118  public native void    deoptimizeAll();
119  public        boolean isMethodCompiled(Executable method) {
120    return isMethodCompiled(method, false /*not osr*/);
121  }
122  public native boolean isMethodCompiled(Executable method, boolean isOsr);
123  public        boolean isMethodCompilable(Executable method) {
124    return isMethodCompilable(method, -1 /*any*/);
125  }
126  public        boolean isMethodCompilable(Executable method, int compLevel) {
127    return isMethodCompilable(method, compLevel, false /*not osr*/);
128  }
129  public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr);
130  public native boolean isMethodQueuedForCompilation(Executable method);
131  public        int     deoptimizeMethod(Executable method) {
132    return deoptimizeMethod(method, false /*not osr*/);
133  }
134  public native int     deoptimizeMethod(Executable method, boolean isOsr);
135  public        void    makeMethodNotCompilable(Executable method) {
136    makeMethodNotCompilable(method, -1 /*any*/);
137  }
138  public        void    makeMethodNotCompilable(Executable method, int compLevel) {
139    makeMethodNotCompilable(method, compLevel, false /*not osr*/);
140  }
141  public native void    makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr);
142  public        int     getMethodCompilationLevel(Executable method) {
143    return getMethodCompilationLevel(method, false /*not ost*/);
144  }
145  public native int     getMethodCompilationLevel(Executable method, boolean isOsr);
146  public native boolean testSetDontInlineMethod(Executable method, boolean value);
147  public        int     getCompileQueuesSize() {
148    return getCompileQueueSize(-1 /*any*/);
149  }
150  public native int     getCompileQueueSize(int compLevel);
151  public native boolean testSetForceInlineMethod(Executable method, boolean value);
152  public        boolean enqueueMethodForCompilation(Executable method, int compLevel) {
153    return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
154  }
155  public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci);
156  public native void    clearMethodState(Executable method);
157  public native void    lockCompilation();
158  public native void    unlockCompilation();
159  public native int     getMethodEntryBci(Executable method);
160  public native Object[] getNMethod(Executable method, boolean isOsr);
161  public native long    allocateCodeBlob(int size, int type);
162  public        long    allocateCodeBlob(long size, int type) {
163      int intSize = (int) size;
164      if ((long) intSize != size || size < 0) {
165          throw new IllegalArgumentException(
166                "size argument has illegal value " + size);
167      }
168      return allocateCodeBlob( intSize, type);
169  }
170  public native void    freeCodeBlob(long addr);
171  public        void    forceNMethodSweep() {
172    try {
173        forceNMethodSweep0().join();
174    } catch (InterruptedException e) {
175        Thread.currentThread().interrupt();
176    }
177  }
178  public native Thread  forceNMethodSweep0();
179  public native Object[] getCodeHeapEntries(int type);
180  public native int     getCompilationActivityMode();
181  public native Object[] getCodeBlob(long addr);
182
183  // Intered strings
184  public native boolean isInStringTable(String str);
185
186  // Memory
187  public native void readReservedMemory();
188  public native long allocateMetaspace(ClassLoader classLoader, long size);
189  public native void freeMetaspace(ClassLoader classLoader, long addr, long size);
190  public native long incMetaspaceCapacityUntilGC(long increment);
191  public native long metaspaceCapacityUntilGC();
192
193  // Force Young GC
194  public native void youngGC();
195
196  // Force Full GC
197  public native void fullGC();
198
199  // Method tries to start concurrent mark cycle.
200  // It returns false if CM Thread is always in concurrent cycle.
201  public native boolean g1StartConcMarkCycle();
202
203  // Tests on ReservedSpace/VirtualSpace classes
204  public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
205  public native void runMemoryUnitTests();
206  public native void readFromNoaccessArea();
207  public native long getThreadStackSize();
208  public native long getThreadRemainingStackSize();
209
210  // CPU features
211  public native String getCPUFeatures();
212
213  // Native extensions
214  public native long getHeapUsageForContext(int context);
215  public native long getHeapRegionCountForContext(int context);
216  public native int getContextForObject(Object obj);
217  public native void printRegionInfo(int context);
218
219  // VM flags
220  public native boolean isConstantVMFlag(String name);
221  public native boolean isLockedVMFlag(String name);
222  public native void    setBooleanVMFlag(String name, boolean value);
223  public native void    setIntxVMFlag(String name, long value);
224  public native void    setUintxVMFlag(String name, long value);
225  public native void    setUint64VMFlag(String name, long value);
226  public native void    setSizeTVMFlag(String name, long value);
227  public native void    setStringVMFlag(String name, String value);
228  public native void    setDoubleVMFlag(String name, double value);
229  public native Boolean getBooleanVMFlag(String name);
230  public native Long    getIntxVMFlag(String name);
231  public native Long    getUintxVMFlag(String name);
232  public native Long    getUint64VMFlag(String name);
233  public native Long    getSizeTVMFlag(String name);
234  public native String  getStringVMFlag(String name);
235  public native Double  getDoubleVMFlag(String name);
236  private final List<Function<String,Object>> flagsGetters = Arrays.asList(
237    this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag,
238    this::getUint64VMFlag, this::getSizeTVMFlag, this::getStringVMFlag,
239    this::getDoubleVMFlag);
240
241  public Object getVMFlag(String name) {
242    return flagsGetters.stream()
243                       .map(f -> f.apply(name))
244                       .filter(x -> x != null)
245                       .findAny()
246                       .orElse(null);
247  }
248  public native int getOffsetForName0(String name);
249  public int getOffsetForName(String name) throws Exception {
250    int offset = getOffsetForName0(name);
251    if (offset == -1) {
252      throw new RuntimeException(name + " not found");
253    }
254    return offset;
255  }
256
257  // Safepoint Checking
258  public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue);
259}
260