WhiteBox.java revision 1402:6ac94d14c01c 
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.BiFunction;
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    g1NumFreeRegions();
99  public native int     g1RegionSize();
100  public native Object[]    parseCommandLine(String commandline, char delim, DiagnosticCommand[] args);
101
102  // NMT
103  public native long NMTMalloc(long size);
104  public native void NMTFree(long mem);
105  public native long NMTReserveMemory(long size);
106  public native void NMTCommitMemory(long addr, long size);
107  public native void NMTUncommitMemory(long addr, long size);
108  public native void NMTReleaseMemory(long addr, long size);
109  public native long NMTMallocWithPseudoStack(long size, int index);
110  public native boolean NMTChangeTrackingLevel();
111  public native int NMTGetHashSize();
112
113  // Compiler
114  public native int     deoptimizeFrames(boolean makeNotEntrant);
115  public native void    deoptimizeAll();
116  public        boolean isMethodCompiled(Executable method) {
117    return isMethodCompiled(method, false /*not osr*/);
118  }
119  public native boolean isMethodCompiled(Executable method, boolean isOsr);
120  public        boolean isMethodCompilable(Executable method) {
121    return isMethodCompilable(method, -1 /*any*/);
122  }
123  public        boolean isMethodCompilable(Executable method, int compLevel) {
124    return isMethodCompilable(method, compLevel, false /*not osr*/);
125  }
126  public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr);
127  public native boolean isMethodQueuedForCompilation(Executable method);
128  public        int     deoptimizeMethod(Executable method) {
129    return deoptimizeMethod(method, false /*not osr*/);
130  }
131  public native int     deoptimizeMethod(Executable method, boolean isOsr);
132  public        void    makeMethodNotCompilable(Executable method) {
133    makeMethodNotCompilable(method, -1 /*any*/);
134  }
135  public        void    makeMethodNotCompilable(Executable method, int compLevel) {
136    makeMethodNotCompilable(method, compLevel, false /*not osr*/);
137  }
138  public native void    makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr);
139  public        int     getMethodCompilationLevel(Executable method) {
140    return getMethodCompilationLevel(method, false /*not ost*/);
141  }
142  public native int     getMethodCompilationLevel(Executable method, boolean isOsr);
143  public native boolean testSetDontInlineMethod(Executable method, boolean value);
144  public        int     getCompileQueuesSize() {
145    return getCompileQueueSize(-1 /*any*/);
146  }
147  public native int     getCompileQueueSize(int compLevel);
148  public native boolean testSetForceInlineMethod(Executable method, boolean value);
149  public        boolean enqueueMethodForCompilation(Executable method, int compLevel) {
150    return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/);
151  }
152  public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci);
153  public native void    clearMethodState(Executable method);
154  public native void    lockCompilation();
155  public native void    unlockCompilation();
156  public native int     getMethodEntryBci(Executable method);
157  public native Object[] getNMethod(Executable method, boolean isOsr);
158  public native long    allocateCodeBlob(int size, int type);
159  public        long    allocateCodeBlob(long size, int type) {
160      int intSize = (int) size;
161      if ((long) intSize != size || size < 0) {
162          throw new IllegalArgumentException(
163                "size argument has illegal value " + size);
164      }
165      return allocateCodeBlob( intSize, type);
166  }
167  public native void    freeCodeBlob(long addr);
168  public        void    forceNMethodSweep() {
169    try {
170        forceNMethodSweep0().join();
171    } catch (InterruptedException e) {
172        Thread.currentThread().interrupt();
173    }
174  }
175  public native Thread  forceNMethodSweep0();
176  public native Object[] getCodeHeapEntries(int type);
177  public native int     getCompilationActivityMode();
178  public native Object[] getCodeBlob(long addr);
179
180  // Intered strings
181  public native boolean isInStringTable(String str);
182
183  // Memory
184  public native void readReservedMemory();
185  public native long allocateMetaspace(ClassLoader classLoader, long size);
186  public native void freeMetaspace(ClassLoader classLoader, long addr, long size);
187  public native long incMetaspaceCapacityUntilGC(long increment);
188  public native long metaspaceCapacityUntilGC();
189
190  // Force Young GC
191  public native void youngGC();
192
193  // Force Full GC
194  public native void fullGC();
195
196  // Method tries to start concurrent mark cycle.
197  // It returns false if CM Thread is always in concurrent cycle.
198  public native boolean g1StartConcMarkCycle();
199
200  // Tests on ReservedSpace/VirtualSpace classes
201  public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations);
202  public native void runMemoryUnitTests();
203  public native void readFromNoaccessArea();
204  public native long getThreadStackSize();
205  public native long getThreadRemainingStackSize();
206
207  // CPU features
208  public native String getCPUFeatures();
209
210  // Native extensions
211  public native long getHeapUsageForContext(int context);
212  public native long getHeapRegionCountForContext(int context);
213  public native int getContextForObject(Object obj);
214  public native void printRegionInfo(int context);
215
216  // VM flags
217  public native boolean isConstantVMFlag(String name);
218  public native boolean isLockedVMFlag(String name);
219  public native void    setBooleanVMFlag(String name, boolean value);
220  public native void    setIntxVMFlag(String name, long value);
221  public native void    setUintxVMFlag(String name, long value);
222  public native void    setUint64VMFlag(String name, long value);
223  public native void    setSizeTVMFlag(String name, long value);
224  public native void    setStringVMFlag(String name, String value);
225  public native void    setDoubleVMFlag(String name, double value);
226  public native Boolean getBooleanVMFlag(String name);
227  public native Long    getIntxVMFlag(String name);
228  public native Long    getUintxVMFlag(String name);
229  public native Long    getUint64VMFlag(String name);
230  public native Long    getSizeTVMFlag(String name);
231  public native String  getStringVMFlag(String name);
232  public native Double  getDoubleVMFlag(String name);
233  private final List<Function<String,Object>> flagsGetters = Arrays.asList(
234    this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag,
235    this::getUint64VMFlag, this::getSizeTVMFlag, this::getStringVMFlag,
236    this::getDoubleVMFlag);
237
238  public Object getVMFlag(String name) {
239    return flagsGetters.stream()
240                       .map(f -> f.apply(name))
241                       .filter(x -> x != null)
242                       .findAny()
243                       .orElse(null);
244  }
245  public native int getOffsetForName0(String name);
246  public int getOffsetForName(String name) throws Exception {
247    int offset = getOffsetForName0(name);
248    if (offset == -1) {
249      throw new RuntimeException(name + " not found");
250    }
251    return offset;
252  }
253  public native Boolean getMethodBooleanOption(Executable method, String name);
254  public native Long    getMethodIntxOption(Executable method, String name);
255  public native Long    getMethodUintxOption(Executable method, String name);
256  public native Double  getMethodDoubleOption(Executable method, String name);
257  public native String  getMethodStringOption(Executable method, String name);
258  private final List<BiFunction<Executable,String,Object>> methodOptionGetters
259      = Arrays.asList(this::getMethodBooleanOption, this::getMethodIntxOption,
260          this::getMethodUintxOption, this::getMethodDoubleOption,
261          this::getMethodStringOption);
262
263  public Object getMethodOption(Executable method, String name) {
264    return methodOptionGetters.stream()
265                              .map(f -> f.apply(method, name))
266                              .filter(x -> x != null)
267                              .findAny()
268                              .orElse(null);
269  }
270
271  // Safepoint Checking
272  public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue);
273}
274