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