1 /* 2 * Copyright (c) 2000, 2018, 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.jvm.hotspot.runtime; 26 27 import java.io.*; 28 import java.util.*; 29 import sun.jvm.hotspot.oops.*; 30 import sun.jvm.hotspot.utilities.*; 31 import sun.jvm.hotspot.debugger.*; 32 33 public abstract class JavaVFrame extends VFrame { 34 35 private static final String ADDRESS_FORMAT = VM.getVM().isLP64() ? "0x%016x" 36 : "0x%08x"; 37 38 /** JVM state */ 39 public abstract Method getMethod(); 40 public abstract int getBCI(); 41 public abstract StackValueCollection getLocals(); 42 public abstract StackValueCollection getExpressions(); 43 public abstract List<MonitorInfo> getMonitors(); 44 45 /** Test operation */ 46 public boolean isJavaFrame() { return true; } 47 48 /** Package-internal constructor */ 49 JavaVFrame(Frame fr, RegisterMap regMap, JavaThread thread) { 50 super(fr, regMap, thread); 51 } 52 53 /** Get monitor (if any) that this JavaVFrame is trying to enter */ 54 // FIXME: not yet implemented 55 // public Address getPendingMonitor(int frameCount); 56 57 public void printLockedObjectClassName(PrintStream tty, 58 OopHandle hobj, String lockState) { 59 if (hobj.asLongValue() != 0L) { 60 tty.format("\t- %s <" + ADDRESS_FORMAT + "> ", 61 lockState, hobj.asLongValue()); 62 63 Klass klass = Oop.getKlassForOopHandle(hobj); 64 String klassName = klass.getName().asString(); 65 tty.print("(a "); 66 if (klassName.equals("java/lang/Class")) { 67 Oop obj = VM.getVM().getObjectHeap().newOop(hobj); 68 klassName = java_lang_Class.asExternalName(obj); 69 tty.print("java.lang.Class for "); 70 } 71 tty.println(klassName.replace('/', '.') + ")"); 72 } 73 } 74 75 private String identifyLockState(MonitorInfo monitor, String waitingState) { 76 Mark mark = new Mark(monitor.owner()); 77 if (mark.hasMonitor() && 78 ( // we have marked ourself as pending on this monitor 79 mark.monitor().equals(thread.getCurrentPendingMonitor()) || 80 // Owned anonymously means that we are not the owner of 81 // the monitor and must be waiting for the owner to 82 // exit it. 83 mark.monitor().isOwnedAnonymous() || 84 // we are not the owner of this monitor 85 !mark.monitor().isEntered(thread) 86 )) { 87 return waitingState; 88 } 89 return "locked"; 90 } 91 92 /** Printing used during stack dumps */ 93 public void printLockInfo(PrintStream tty, int frameCount) { 94 // If this is the first frame and it is java.lang.Object.wait(...) 95 // then print out the receiver. Locals are not always available, 96 // e.g., compiled native frames have no scope so there are no locals. 97 if (frameCount == 0) { 98 if (getMethod().getName().asString().equals("wait") && 99 getMethod().getMethodHolder().getName().asString().equals("java/lang/Object")) { 100 String waitState = "waiting on"; // assume we are waiting 101 // If earlier in the output we reported java.lang.Thread.State == 102 // "WAITING (on object monitor)" and now we report "waiting on", then 103 // we are still waiting for notification or timeout. Otherwise if 104 // we earlier reported java.lang.Thread.State == "BLOCKED (on object 105 // monitor)", then we are actually waiting to re-lock the monitor. 106 StackValueCollection locs = getLocals(); 107 if (!locs.isEmpty()) { 108 StackValue sv = locs.get(0); 109 if (sv.getType() == BasicType.getTObject()) { 110 OopHandle o = sv.getObject(); 111 if (OopUtilities.threadOopGetThreadStatus(thread.getThreadObj()) == OopUtilities.THREAD_STATUS_BLOCKED_ON_MONITOR_ENTER) { 112 waitState = "waiting to re-lock in wait()"; 113 } 114 printLockedObjectClassName(tty, o, waitState); 115 } 116 } else { 117 tty.println("\t- " + waitState + " <no object reference available>"); 118 } 119 } else if (thread.getCurrentParkBlocker() != null) { 120 Oop obj = thread.getCurrentParkBlocker(); 121 Klass k = obj.getKlass(); 122 tty.format("\t- parking to wait for <" + ADDRESS_FORMAT + "> (a %s)", 123 obj.getHandle().asLongValue(), k.getName().asString()); 124 tty.println(); 125 } 126 } 127 128 // Print out all monitors that we have locked, or are trying to lock, 129 // including re-locking after being notified or timing out in a wait(). 130 List<MonitorInfo> mons = getMonitors(); 131 if (!mons.isEmpty()) { 132 boolean foundFirstMonitor = false; 133 for (int index = mons.size() - 1; index >= 0; index--) { 134 MonitorInfo monitor = mons.get(index); 135 if (monitor.eliminated() && isCompiledFrame()) { // Eliminated in compiled code 136 if (monitor.ownerIsScalarReplaced()) { 137 Klass k = Oop.getKlassForOopHandle(monitor.ownerKlass()); 138 tty.println("\t- eliminated <owner is scalar replaced> (a " + k.getName().asString() + ")"); 139 } else if (monitor.owner() != null) { 140 printLockedObjectClassName(tty, monitor.owner(), "eliminated"); 141 } 142 continue; 143 } 144 if (monitor.owner() != null) { 145 // the monitor is associated with an object, i.e., it is locked 146 String lockState = "locked"; 147 if (!foundFirstMonitor && frameCount == 0) { 148 // If this is the first frame and we haven't found an owned 149 // monitor before, then we need to see if we have completed 150 // the lock or if we are blocked trying to acquire it. Only 151 // an inflated monitor that is first on the monitor list in 152 // the first frame can block us on a monitor enter. 153 lockState = identifyLockState(monitor, "waiting to lock"); 154 } 155 printLockedObjectClassName(tty, monitor.owner(), lockState); 156 foundFirstMonitor = true; 157 } 158 } 159 } 160 } 161 162 /** Printing operations */ 163 164 // 165 // FIXME: implement visitor pattern for traversing vframe contents? 166 // 167 168 public void print() { 169 printOn(System.out); 170 } 171 172 public void printOn(PrintStream tty) { 173 super.printOn(tty); 174 175 tty.print("\t"); 176 getMethod().printValueOn(tty); 177 tty.println(); 178 tty.println("\tbci:\t" + getBCI()); 179 180 printStackValuesOn(tty, "locals", getLocals()); 181 printStackValuesOn(tty, "expressions", getExpressions()); 182 } 183 184 public void printActivation(int index) { 185 printActivationOn(System.out, index); 186 } 187 188 public void printActivationOn(PrintStream tty, int index) { 189 // frame number and method 190 tty.print(index + " - "); 191 printValueOn(tty); 192 tty.println(); 193 194 if (VM.getVM().wizardMode()) { 195 printOn(tty); 196 tty.println(); 197 } 198 } 199 200 /** Verification operations */ 201 public void verify() { 202 } 203 204 public boolean equals(Object o) { 205 if (o == null || !(o instanceof JavaVFrame)) { 206 return false; 207 } 208 209 JavaVFrame other = (JavaVFrame) o; 210 211 // Check static part 212 if (!getMethod().equals(other.getMethod())) { 213 return false; 214 } 215 216 if (getBCI() != other.getBCI()) { 217 return false; 218 } 219 220 // dynamic part - we just compare the frame pointer 221 if (! getFrame().equals(other.getFrame())) { 222 return false; 223 } 224 return true; 225 } 226 227 public int hashCode() { 228 return getMethod().hashCode() ^ getBCI() ^ getFrame().hashCode(); 229 } 230 231 /** Structural compare */ 232 public boolean structuralCompare(JavaVFrame other) { 233 // Check static part 234 if (!getMethod().equals(other.getMethod())) { 235 return false; 236 } 237 238 if (getBCI() != other.getBCI()) { 239 return false; 240 } 241 242 // Check locals 243 StackValueCollection locs = getLocals(); 244 StackValueCollection otherLocs = other.getLocals(); 245 if (Assert.ASSERTS_ENABLED) { 246 Assert.that(locs.size() == otherLocs.size(), "sanity check"); 247 } 248 for (int i = 0; i < locs.size(); i++) { 249 // it might happen the compiler reports a conflict and 250 // the interpreter reports a bogus int. 251 if ( isCompiledFrame() && (locs.get(i)).getType() == BasicType.getTConflict()) continue; 252 if (other.isCompiledFrame() && (otherLocs.get(i)).getType() == BasicType.getTConflict()) continue; 253 254 if (!locs.get(i).equals(otherLocs.get(i))) { 255 return false; 256 } 257 } 258 259 // Check expressions 260 StackValueCollection exprs = getExpressions(); 261 StackValueCollection otherExprs = other.getExpressions(); 262 if (Assert.ASSERTS_ENABLED) { 263 Assert.that(exprs.size() == otherExprs.size(), "sanity check"); 264 } 265 for (int i = 0; i < exprs.size(); i++) { 266 if (!exprs.get(i).equals(otherExprs.get(i))) { 267 return false; 268 } 269 } 270 271 return true; 272 } 273 274 //-------------------------------------------------------------------------------- 275 // Internals only below this point 276 // 277 278 private void printStackValuesOn(PrintStream tty, String title, StackValueCollection values) { 279 if (values.isEmpty()) { 280 return; 281 } 282 tty.println("\t" + title + ":"); 283 for (int index = 0; index < values.size(); index++) { 284 tty.print("\t" + index + "\t"); 285 values.get(index).printOn(tty); 286 tty.println(); 287 } 288 } 289 } --- EOF ---