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 mark.monitor().isOwnedAnonymous() || 81 // we are not the owner of this monitor 82 !mark.monitor().isEntered(thread) 83 )) { 84 return waitingState; 85 } 86 return "locked"; 87 } 88 89 /** Printing used during stack dumps */ 90 public void printLockInfo(PrintStream tty, int frameCount) { 91 // If this is the first frame and it is java.lang.Object.wait(...) 92 // then print out the receiver. Locals are not always available, 93 // e.g., compiled native frames have no scope so there are no locals. 94 if (frameCount == 0) { 95 if (getMethod().getName().asString().equals("wait") && 96 getMethod().getMethodHolder().getName().asString().equals("java/lang/Object")) { 97 String waitState = "waiting on"; // assume we are waiting 98 // If earlier in the output we reported java.lang.Thread.State == 99 // "WAITING (on object monitor)" and now we report "waiting on", then 100 // we are still waiting for notification or timeout. Otherwise if 101 // we earlier reported java.lang.Thread.State == "BLOCKED (on object 102 // monitor)", then we are actually waiting to re-lock the monitor. 103 StackValueCollection locs = getLocals(); 104 if (!locs.isEmpty()) { 105 StackValue sv = locs.get(0); 106 if (sv.getType() == BasicType.getTObject()) { 107 OopHandle o = sv.getObject(); 108 if (OopUtilities.threadOopGetThreadStatus(thread.getThreadObj()) == OopUtilities.THREAD_STATUS_BLOCKED_ON_MONITOR_ENTER) { 109 waitState = "waiting to re-lock in wait()"; 110 } 111 printLockedObjectClassName(tty, o, waitState); 112 } 113 } else { 114 tty.println("\t- " + waitState + " <no object reference available>"); 115 } 116 } else if (thread.getCurrentParkBlocker() != null) { 117 Oop obj = thread.getCurrentParkBlocker(); 118 Klass k = obj.getKlass(); 119 tty.format("\t- parking to wait for <" + ADDRESS_FORMAT + "> (a %s)", 120 obj.getHandle().asLongValue(), k.getName().asString()); 121 tty.println(); 122 } 123 } 124 125 // Print out all monitors that we have locked, or are trying to lock, 126 // including re-locking after being notified or timing out in a wait(). 127 List<MonitorInfo> mons = getMonitors(); 128 if (!mons.isEmpty()) { 129 boolean foundFirstMonitor = false; 130 for (int index = mons.size() - 1; index >= 0; index--) { 131 MonitorInfo monitor = mons.get(index); 132 if (monitor.eliminated() && isCompiledFrame()) { // Eliminated in compiled code 133 if (monitor.ownerIsScalarReplaced()) { 134 Klass k = Oop.getKlassForOopHandle(monitor.ownerKlass()); 135 tty.println("\t- eliminated <owner is scalar replaced> (a " + k.getName().asString() + ")"); 136 } else if (monitor.owner() != null) { 137 printLockedObjectClassName(tty, monitor.owner(), "eliminated"); 138 } 139 continue; 140 } 141 if (monitor.owner() != null) { 142 // the monitor is associated with an object, i.e., it is locked 143 String lockState = "locked"; 144 if (!foundFirstMonitor && frameCount == 0) { 145 // If this is the first frame and we haven't found an owned 146 // monitor before, then we need to see if we have completed 147 // the lock or if we are blocked trying to acquire it. Only 148 // an inflated monitor that is first on the monitor list in 149 // the first frame can block us on a monitor enter. 150 lockState = identifyLockState(monitor, "waiting to lock"); 151 } 152 printLockedObjectClassName(tty, monitor.owner(), lockState); 153 foundFirstMonitor = true; 154 } 155 } 156 } 157 } 158 159 /** Printing operations */ 160 161 // 162 // FIXME: implement visitor pattern for traversing vframe contents? 163 // 164 165 public void print() { 166 printOn(System.out); 167 } 168 169 public void printOn(PrintStream tty) { 170 super.printOn(tty); 171 172 tty.print("\t"); 173 getMethod().printValueOn(tty); 174 tty.println(); 175 tty.println("\tbci:\t" + getBCI()); 176 177 printStackValuesOn(tty, "locals", getLocals()); 178 printStackValuesOn(tty, "expressions", getExpressions()); 179 } 180 181 public void printActivation(int index) { 182 printActivationOn(System.out, index); 183 } 184 185 public void printActivationOn(PrintStream tty, int index) { 186 // frame number and method 187 tty.print(index + " - "); 188 printValueOn(tty); 189 tty.println(); 190 191 if (VM.getVM().wizardMode()) { 192 printOn(tty); 193 tty.println(); 194 } 195 } 196 197 /** Verification operations */ 198 public void verify() { 199 } 200 201 public boolean equals(Object o) { 202 if (o == null || !(o instanceof JavaVFrame)) { 203 return false; 204 } 205 206 JavaVFrame other = (JavaVFrame) o; 207 208 // Check static part 209 if (!getMethod().equals(other.getMethod())) { 210 return false; 211 } 212 213 if (getBCI() != other.getBCI()) { 214 return false; 215 } 216 217 // dynamic part - we just compare the frame pointer 218 if (! getFrame().equals(other.getFrame())) { 219 return false; 220 } 221 return true; 222 } 223 224 public int hashCode() { 225 return getMethod().hashCode() ^ getBCI() ^ getFrame().hashCode(); 226 } 227 228 /** Structural compare */ 229 public boolean structuralCompare(JavaVFrame other) { 230 // Check static part 231 if (!getMethod().equals(other.getMethod())) { 232 return false; 233 } 234 235 if (getBCI() != other.getBCI()) { 236 return false; 237 } 238 239 // Check locals 240 StackValueCollection locs = getLocals(); 241 StackValueCollection otherLocs = other.getLocals(); 242 if (Assert.ASSERTS_ENABLED) { 243 Assert.that(locs.size() == otherLocs.size(), "sanity check"); 244 } 245 for (int i = 0; i < locs.size(); i++) { 246 // it might happen the compiler reports a conflict and 247 // the interpreter reports a bogus int. 248 if ( isCompiledFrame() && (locs.get(i)).getType() == BasicType.getTConflict()) continue; 249 if (other.isCompiledFrame() && (otherLocs.get(i)).getType() == BasicType.getTConflict()) continue; 250 251 if (!locs.get(i).equals(otherLocs.get(i))) { 252 return false; 253 } 254 } 255 256 // Check expressions 257 StackValueCollection exprs = getExpressions(); 258 StackValueCollection otherExprs = other.getExpressions(); 259 if (Assert.ASSERTS_ENABLED) { 260 Assert.that(exprs.size() == otherExprs.size(), "sanity check"); 261 } 262 for (int i = 0; i < exprs.size(); i++) { 263 if (!exprs.get(i).equals(otherExprs.get(i))) { 264 return false; 265 } 266 } 267 268 return true; 269 } 270 271 //-------------------------------------------------------------------------------- 272 // Internals only below this point 273 // 274 275 private void printStackValuesOn(PrintStream tty, String title, StackValueCollection values) { 276 if (values.isEmpty()) { 277 return; 278 } 279 tty.println("\t" + title + ":"); 280 for (int index = 0; index < values.size(); index++) { 281 tty.print("\t" + index + "\t"); 282 values.get(index).printOn(tty); 283 tty.println(); 284 } 285 } 286 }