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 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 NMTIsDetailSupported(); 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 } 253 254 // Safepoint Checking 255 public native void assertMatchingSafepointCalls(boolean mutexSafepointValue, boolean attemptedNoSafepointValue); 256 }