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 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 int deoptimizeFrames(boolean makeNotEntrant); 113 public native void deoptimizeAll(); 114 public boolean isMethodCompiled(Executable method) { 115 return isMethodCompiled(method, false /*not osr*/); 116 } 117 public native boolean isMethodCompiled(Executable method, boolean isOsr); 118 public boolean isMethodCompilable(Executable method) { 119 return isMethodCompilable(method, -1 /*any*/); 120 } 121 public boolean isMethodCompilable(Executable method, int compLevel) { 122 return isMethodCompilable(method, compLevel, false /*not osr*/); 123 } 124 public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr); 125 public native boolean isMethodQueuedForCompilation(Executable method); 126 public int deoptimizeMethod(Executable method) { 127 return deoptimizeMethod(method, false /*not osr*/); 128 } 129 public native int deoptimizeMethod(Executable method, boolean isOsr); 130 public void makeMethodNotCompilable(Executable method) { 131 makeMethodNotCompilable(method, -1 /*any*/); 132 } 133 public void makeMethodNotCompilable(Executable method, int compLevel) { 134 makeMethodNotCompilable(method, compLevel, false /*not osr*/); 135 } 136 public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr); 137 public int getMethodCompilationLevel(Executable method) { 138 return getMethodCompilationLevel(method, false /*not ost*/); 139 } 140 public native int getMethodCompilationLevel(Executable method, boolean isOsr); 141 public native boolean testSetDontInlineMethod(Executable method, boolean value); 142 public int getCompileQueuesSize() { 143 return getCompileQueueSize(-1 /*any*/); 144 } 145 public native int getCompileQueueSize(int compLevel); 146 public native boolean testSetForceInlineMethod(Executable method, boolean value); 147 public boolean enqueueMethodForCompilation(Executable method, int compLevel) { 148 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/); 149 } 150 public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci); 151 public native void clearMethodState(Executable method); 152 public native void lockCompilation(); 153 public native void unlockCompilation(); 154 public native int getMethodEntryBci(Executable method); 155 public native Object[] getNMethod(Executable method, boolean isOsr); 156 public native long allocateCodeBlob(int size, int type); 157 public native void freeCodeBlob(long addr); 158 public void forceNMethodSweep() { 159 try { 160 forceNMethodSweep0().join(); 161 } catch (InterruptedException e) { 162 Thread.currentThread().interrupt(); 163 } 164 } 165 public native Thread forceNMethodSweep0(); 166 public native Object[] getCodeHeapEntries(int type); 167 public native int getCompilationActivityMode(); 168 public native Object[] getCodeBlob(long addr); 169 /** 170 * @return the id compiler (0 - int, 1 - C1, 2 - C2) 171 */ 172 public static int getCompiler() { return 0; } 173 174 // Intered strings 175 public native boolean isInStringTable(String str); 176 177 // Memory 178 public native void readReservedMemory(); 179 public native long allocateMetaspace(ClassLoader classLoader, long size); 180 public native void freeMetaspace(ClassLoader classLoader, long addr, long size); 181 public native long incMetaspaceCapacityUntilGC(long increment); 182 public native long metaspaceCapacityUntilGC(); 183 184 // Force Young GC 185 public native void youngGC(); 186 187 // Force Full GC 188 public native void fullGC(); 189 190 // Method tries to start concurrent mark cycle. 191 // It returns false if CM Thread is always in concurrent cycle. 192 public native boolean g1StartConcMarkCycle(); 193 194 // Tests on ReservedSpace/VirtualSpace classes 195 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations); 196 public native void runMemoryUnitTests(); 197 public native void readFromNoaccessArea(); 198 public native long getThreadStackSize(); 199 public native long getThreadRemainingStackSize(); 200 201 // CPU features 202 public native String getCPUFeatures(); 203 204 // Native extensions 205 public native long getHeapUsageForContext(int context); 206 public native long getHeapRegionCountForContext(int context); 207 public native int getContextForObject(Object obj); 208 public native void printRegionInfo(int context); 209 210 // VM flags 211 public native boolean isConstantVMFlag(String name); 212 public native boolean isLockedVMFlag(String name); 213 public native void setBooleanVMFlag(String name, boolean value); 214 public native void setIntxVMFlag(String name, long value); 215 public native void setUintxVMFlag(String name, long value); 216 public native void setUint64VMFlag(String name, long value); 217 public native void setSizeTVMFlag(String name, long value); 218 public native void setStringVMFlag(String name, String value); 219 public native void setDoubleVMFlag(String name, double value); 220 public native Boolean getBooleanVMFlag(String name); 221 public native Long getIntxVMFlag(String name); 222 public native Long getUintxVMFlag(String name); 223 public native Long getUint64VMFlag(String name); 224 public native Long getSizeTVMFlag(String name); 225 public native String getStringVMFlag(String name); 226 public native Double getDoubleVMFlag(String name); 227 private final List<Function<String,Object>> flagsGetters = Arrays.asList( 228 this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag, 229 this::getUint64VMFlag, this::getSizeTVMFlag, this::getStringVMFlag, 230 this::getDoubleVMFlag); 231 232 public Object getVMFlag(String name) { 233 return flagsGetters.stream() 234 .map(f -> f.apply(name)) 235 .filter(x -> x != null) 236 .findAny() 237 .orElse(null); 238 } 239 public native int getOffsetForName0(String name); 240 public int getOffsetForName(String name) throws Exception { 241 int offset = getOffsetForName0(name); 242 if (offset == -1) { 243 throw new RuntimeException(name + " not found"); 244 } 245 return offset; 246 } 247 248 }