1 /* 2 * Copyright (c) 2012, 2019, 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.management.MemoryUsage; 28 import java.lang.reflect.Executable; 29 import java.util.Arrays; 30 import java.util.List; 31 import java.util.function.Function; 32 import java.util.stream.Stream; 33 import java.security.BasicPermission; 34 import java.net.URL; 35 36 import sun.hotspot.parser.DiagnosticCommand; 37 38 public class WhiteBox { 39 40 @SuppressWarnings("serial") 41 public static class WhiteBoxPermission extends BasicPermission { 42 public WhiteBoxPermission(String s) { 43 super(s); 44 } 45 } 46 47 private WhiteBox() {} 48 private static final WhiteBox instance = new WhiteBox(); 49 private static native void registerNatives(); 50 51 /** 52 * Returns the singleton WhiteBox instance. 53 * 54 * The returned WhiteBox object should be carefully guarded 55 * by the caller, since it can be used to read and write data 56 * at arbitrary memory addresses. It must never be passed to 57 * untrusted code. 58 */ 59 public synchronized static WhiteBox getWhiteBox() { 60 SecurityManager sm = System.getSecurityManager(); 61 if (sm != null) { 62 sm.checkPermission(new WhiteBoxPermission("getInstance")); 63 } 64 return instance; 65 } 66 67 static { 68 registerNatives(); 69 } 70 71 // Get the maximum heap size supporting COOPs 72 public native long getCompressedOopsMaxHeapSize(); 73 // Arguments 74 public native void printHeapSizes(); 75 76 // Memory 77 public native long getObjectAddress(Object o); 78 public native int getHeapOopSize(); 79 public native int getVMPageSize(); 80 public native long getVMLargePageSize(); 81 82 public native boolean isObjectInOldGen(Object o); 83 public native long getObjectSize(Object o); 84 85 // Runtime 86 // Make sure class name is in the correct format 87 public boolean isClassAlive(String name) { 88 return isClassAlive0(name.replace('.', '/')); 89 } 90 private native boolean isClassAlive0(String name); 91 public native boolean isMonitorInflated(Object obj); 92 public native void forceSafepoint(); 93 94 // Resource/Class Lookup Cache 95 public native boolean classKnownToNotExist(ClassLoader loader, String name); 96 public native URL[] getLookupCacheURLs(ClassLoader loader); 97 public native int[] getLookupCacheMatches(ClassLoader loader, String name); 98 99 // JVMTI 100 public native void addToBootstrapClassLoaderSearch(String segment); 101 public native void addToSystemClassLoaderSearch(String segment); 102 103 // G1 104 public native boolean g1InConcurrentMark(); 105 public native boolean g1IsHumongous(Object o); 106 public native long g1NumMaxRegions(); 107 public native long g1NumFreeRegions(); 108 public native int g1RegionSize(); 109 public native MemoryUsage g1AuxiliaryMemoryUsage(); 110 public native Object[] parseCommandLine(String commandline, DiagnosticCommand[] args); 111 112 // NMT 113 public native long NMTMalloc(long size); 114 public native void NMTFree(long mem); 115 public native long NMTReserveMemory(long size); 116 public native void NMTCommitMemory(long addr, long size); 117 public native void NMTUncommitMemory(long addr, long size); 118 public native void NMTReleaseMemory(long addr, long size); 119 public native long NMTMallocWithPseudoStack(long size, int index); 120 public native long NMTMallocWithPseudoStackAndType(long size, int index, int type); 121 public native boolean NMTIsDetailSupported(); 122 public native boolean NMTChangeTrackingLevel(); 123 public native int NMTGetHashSize(); 124 125 // Compiler 126 public native void deoptimizeAll(); 127 public boolean isMethodCompiled(Executable method) { 128 return isMethodCompiled(method, false /*not osr*/); 129 } 130 public native boolean isMethodCompiled(Executable method, boolean isOsr); 131 public boolean isMethodCompilable(Executable method) { 132 return isMethodCompilable(method, -1 /*any*/); 133 } 134 public boolean isMethodCompilable(Executable method, int compLevel) { 135 return isMethodCompilable(method, compLevel, false /*not osr*/); 136 } 137 public native boolean isMethodCompilable(Executable method, int compLevel, boolean isOsr); 138 public native boolean isMethodQueuedForCompilation(Executable method); 139 public int deoptimizeMethod(Executable method) { 140 return deoptimizeMethod(method, false /*not osr*/); 141 } 142 public native int deoptimizeMethod(Executable method, boolean isOsr); 143 public void makeMethodNotCompilable(Executable method) { 144 makeMethodNotCompilable(method, -1 /*any*/); 145 } 146 public void makeMethodNotCompilable(Executable method, int compLevel) { 147 makeMethodNotCompilable(method, compLevel, false /*not osr*/); 148 } 149 public native void makeMethodNotCompilable(Executable method, int compLevel, boolean isOsr); 150 public int getMethodCompilationLevel(Executable method) { 151 return getMethodCompilationLevel(method, false /*not ost*/); 152 } 153 public native int getMethodCompilationLevel(Executable method, boolean isOsr); 154 public native boolean testSetDontInlineMethod(Executable method, boolean value); 155 public int getCompileQueuesSize() { 156 return getCompileQueueSize(-1 /*any*/); 157 } 158 public native int getCompileQueueSize(int compLevel); 159 public native boolean testSetForceInlineMethod(Executable method, boolean value); 160 public boolean enqueueMethodForCompilation(Executable method, int compLevel) { 161 return enqueueMethodForCompilation(method, compLevel, -1 /*InvocationEntryBci*/); 162 } 163 public native boolean enqueueMethodForCompilation(Executable method, int compLevel, int entry_bci); 164 public native void clearMethodState(Executable method); 165 public native void markMethodProfiled(Executable method); 166 public native int getMethodEntryBci(Executable method); 167 public native Object[] getNMethod(Executable method, boolean isOsr); 168 169 // Intered strings 170 public native boolean isInStringTable(String str); 171 172 // Memory 173 public native void readReservedMemory(); 174 public native long allocateMetaspace(ClassLoader classLoader, long size); 175 public native void freeMetaspace(ClassLoader classLoader, long addr, long size); 176 public native long incMetaspaceCapacityUntilGC(long increment); 177 public native long metaspaceCapacityUntilGC(); 178 179 // Force Young GC 180 public native void youngGC(); 181 182 // Force Full GC 183 public native void fullGC(); 184 185 // Method tries to start concurrent mark cycle. 186 // It returns false if CM Thread is always in concurrent cycle. 187 public native boolean g1StartConcMarkCycle(); 188 189 // Tests on ReservedSpace/VirtualSpace classes 190 public native int stressVirtualSpaceResize(long reservedSpaceSize, long magnitude, long iterations); 191 public native void runMemoryUnitTests(); 192 public native void readFromNoaccessArea(); 193 public native long getThreadStackSize(); 194 public native long getThreadRemainingStackSize(); 195 196 // CPU features 197 public native String getCPUFeatures(); 198 199 // Native extensions 200 public native long getHeapUsageForContext(int context); 201 public native long getHeapRegionCountForContext(int context); 202 public native int getContextForObject(Object obj); 203 public native void printRegionInfo(int context); 204 205 // VM flags 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 setStringVMFlag(String name, String value); 211 public native void setDoubleVMFlag(String name, double value); 212 public native Boolean getBooleanVMFlag(String name); 213 public native Long getIntxVMFlag(String name); 214 public native Long getUintxVMFlag(String name); 215 public native Long getUint64VMFlag(String name); 216 public native String getStringVMFlag(String name); 217 public native Double getDoubleVMFlag(String name); 218 private final List<Function<String,Object>> flagsGetters = Arrays.asList( 219 this::getBooleanVMFlag, this::getIntxVMFlag, this::getUintxVMFlag, 220 this::getUint64VMFlag, this::getStringVMFlag, this::getDoubleVMFlag); 221 222 public Object getVMFlag(String name) { 223 return flagsGetters.stream() 224 .map(f -> f.apply(name)) 225 .filter(x -> x != null) 226 .findAny() 227 .orElse(null); 228 } 229 public native int getOffsetForName0(String name); 230 public int getOffsetForName(String name) throws Exception { 231 int offset = getOffsetForName0(name); 232 if (offset == -1) { 233 throw new RuntimeException(name + " not found"); 234 } 235 return offset; 236 } 237 238 // Class Data Sharing 239 public native boolean isSharedClass(Class<?> c); 240 241 // Returns true on linux if library has the noexecstack flag set. 242 public native boolean checkLibSpecifiesNoexecstack(String libfilename); 243 244 // Container testing 245 public native boolean isContainerized(); 246 public native void printOsInfo(); 247 248 }